Re: [PATCH v4 08/11] tty: add pruss SUART driver

Re: [PATCH v4 08/11] tty: add pruss SUART driver

[Subhasish Ghosh]

Hi Sekhar,

>>> Say, if the driver is loaded as a module.
>>> If I allocate the sram in the platform code, how to I
>>> free it when the driver is unloaded. 
>> 
>> This is what I said in my last e-mail. What is
>> the issue you see with this approach?
>> 
>> | Thanks for the clarification. In this case, the driver
>> | should use platform callbacks to get/put fast fifo
>> | space. In case this callback is not populated by the
>> | platform or returns an error, the driver should fall
>> | back to allocating from DDR.
>> 
> 
> ok, so what you are suggesting is that I implement some
> callbacks (like .fifo_alloc, .fifo_dealloc) which can allocate
> memory using sram_alloc.
> My doubt is, if already such API's are there (by Russel) or you
> are suggesting to implement them.

I can add the fifo_alloc/dealloc as part of the suart platform_data,
Is that's what you are suggesting. If you may please point me out 
to any example. I am just not clear with this. 

RE: [PATCH v4 08/11] tty: add pruss SUART driver

[Nori, Sekhar]

On Mon, May 16, 2011 at 10:47:18, Subhasish Ghosh wrote:
> Hi Sekhar,
> 
> >>> Say, if the driver is loaded as a module.
> >>> If I allocate the sram in the platform code, how to I
> >>> free it when the driver is unloaded. 
> >> 
> >> This is what I said in my last e-mail. What is
> >> the issue you see with this approach?
> >> 
> >> | Thanks for the clarification. In this case, the driver
> >> | should use platform callbacks to get/put fast fifo
> >> | space. In case this callback is not populated by the
> >> | platform or returns an error, the driver should fall
> >> | back to allocating from DDR.
> >> 
> > 
> > ok, so what you are suggesting is that I implement some
> > callbacks (like .fifo_alloc, .fifo_dealloc) which can allocate
> > memory using sram_alloc.
> > My doubt is, if already such API's are there (by Russel) or you
> > are suggesting to implement them.
> 
> I can add the fifo_alloc/dealloc as part of the suart platform_data,
> Is that's what you are suggesting. If you may please point me out 
> to any example. I am just not clear with this. 

Yes, that's what I am suggesting. I don't have an exact example
for you, but for an example of how function pointers can be passed
along in platform data you can look at the platform data for
DA8x FB driver in include/video/da8xx-fb.h.

Hope that helps.

Thanks,
Sekhar

[PATCH v4 08/11] tty: add pruss SUART driver

[Nori, Sekhar]

On Mon, May 16, 2011 at 10:47:18, Subhasish Ghosh wrote:
> Hi Sekhar,
> 
> >>> Say, if the driver is loaded as a module.
> >>> If I allocate the sram in the platform code, how to I
> >>> free it when the driver is unloaded. 
> >> 
> >> This is what I said in my last e-mail. What is
> >> the issue you see with this approach?
> >> 
> >> | Thanks for the clarification. In this case, the driver
> >> | should use platform callbacks to get/put fast fifo
> >> | space. In case this callback is not populated by the
> >> | platform or returns an error, the driver should fall
> >> | back to allocating from DDR.
> >> 
> > 
> > ok, so what you are suggesting is that I implement some
> > callbacks (like .fifo_alloc, .fifo_dealloc) which can allocate
> > memory using sram_alloc.
> > My doubt is, if already such API's are there (by Russel) or you
> > are suggesting to implement them.
> 
> I can add the fifo_alloc/dealloc as part of the suart platform_data,
> Is that's what you are suggesting. If you may please point me out 
> to any example. I am just not clear with this. 

Yes, that's what I am suggesting. I don't have an exact example
for you, but for an example of how function pointers can be passed
along in platform data you can look at the platform data for
DA8x FB driver in include/video/da8xx-fb.h.

Hope that helps.

Thanks,
Sekhar

Re: [PATCH v4 08/11] tty: add pruss SUART driver

[Subhasish Ghosh]

Hi Sekhar,

>> > ok, so what you are suggesting is that I implement some
>> > callbacks (like .fifo_alloc, .fifo_dealloc) which can allocate
>> > memory using sram_alloc.
>> > My doubt is, if already such API's are there (by Russel) or you
>> > are suggesting to implement them.
>>
>> I can add the fifo_alloc/dealloc as part of the suart platform_data,
>> Is that's what you are suggesting. If you may please point me out
>> to any example. I am just not clear with this.
>
> Yes, that's what I am suggesting. I don't have an exact example
> for you, but for an example of how function pointers can be passed
> along in platform data you can look at the platform data for
> DA8x FB driver in include/video/da8xx-fb.h.
>

Does this look ok.
This code snippet is in the driver file.

        if (soft_uart->use_sram) {
                soft_uart->suart_iomap.p_fifo_buff_virt_base =
                pdata->fifo_alloc(SUART_CNTX_SZ * NR_SUART * 2,
                (dma_addr_t *) 
&soft_uart->suart_iomap.p_fifo_buff_phys_base);
                if (!soft_uart->suart_iomap.p_fifo_buff_virt_base) {
                        soft_uart->suart_iomap.p_fifo_buff_virt_base =
                        dma_alloc_coherent(&pdev->dev,
                        SUART_CNTX_SZ * NR_SUART * 2,
                        (dma_addr_t *) &soft_uart->suart_iomap.
                        p_fifo_buff_phys_base, GFP_KERNEL);
                        soft_uart->use_sram = false;
                        if (!soft_uart->suart_iomap.p_fifo_buff_virt_base)
                                goto probe_exit_iounmap;
                }
        } else {
                soft_uart->suart_iomap.p_fifo_buff_virt_base =
                dma_alloc_coherent(&pdev->dev,
                SUART_CNTX_SZ * NR_SUART * 2,
                (dma_addr_t *) &soft_uart->suart_iomap.
                p_fifo_buff_phys_base, GFP_KERNEL);
                if (!soft_uart->suart_iomap.p_fifo_buff_virt_base)
                        goto probe_exit_iounmap;
        }

I added the fifo_alloc into the suart_data of the board file.

static struct da850_evm_pruss_suart_data suart_data = {
        .version        = 1,
        .setup          = da850_evm_pruss_suart_setup,
        .fifo_alloc     = sram_alloc,
        .fifo_free      = sram_free,
};

Best Regards,
Subhasish Ghosh
 

[PATCH v4 08/11] tty: add pruss SUART driver

[Subhasish Ghosh]

Hi Sekhar,

>> > ok, so what you are suggesting is that I implement some
>> > callbacks (like .fifo_alloc, .fifo_dealloc) which can allocate
>> > memory using sram_alloc.
>> > My doubt is, if already such API's are there (by Russel) or you
>> > are suggesting to implement them.
>>
>> I can add the fifo_alloc/dealloc as part of the suart platform_data,
>> Is that's what you are suggesting. If you may please point me out
>> to any example. I am just not clear with this.
>
> Yes, that's what I am suggesting. I don't have an exact example
> for you, but for an example of how function pointers can be passed
> along in platform data you can look at the platform data for
> DA8x FB driver in include/video/da8xx-fb.h.
>

Does this look ok.
This code snippet is in the driver file.

        if (soft_uart->use_sram) {
                soft_uart->suart_iomap.p_fifo_buff_virt_base =
                pdata->fifo_alloc(SUART_CNTX_SZ * NR_SUART * 2,
                (dma_addr_t *) 
&soft_uart->suart_iomap.p_fifo_buff_phys_base);
                if (!soft_uart->suart_iomap.p_fifo_buff_virt_base) {
                        soft_uart->suart_iomap.p_fifo_buff_virt_base =
                        dma_alloc_coherent(&pdev->dev,
                        SUART_CNTX_SZ * NR_SUART * 2,
                        (dma_addr_t *) &soft_uart->suart_iomap.
                        p_fifo_buff_phys_base, GFP_KERNEL);
                        soft_uart->use_sram = false;
                        if (!soft_uart->suart_iomap.p_fifo_buff_virt_base)
                                goto probe_exit_iounmap;
                }
        } else {
                soft_uart->suart_iomap.p_fifo_buff_virt_base =
                dma_alloc_coherent(&pdev->dev,
                SUART_CNTX_SZ * NR_SUART * 2,
                (dma_addr_t *) &soft_uart->suart_iomap.
                p_fifo_buff_phys_base, GFP_KERNEL);
                if (!soft_uart->suart_iomap.p_fifo_buff_virt_base)
                        goto probe_exit_iounmap;
        }

I added the fifo_alloc into the suart_data of the board file.

static struct da850_evm_pruss_suart_data suart_data = {
        .version        = 1,
        .setup          = da850_evm_pruss_suart_setup,
        .fifo_alloc     = sram_alloc,
        .fifo_free      = sram_free,
};

Best Regards,
Subhasish Ghosh
 

Re: [PATCH v4 08/11] tty: add pruss SUART driver

[Subhasish Ghosh]

>> 
>> Say, if the driver is loaded as a module.
>> If I allocate the sram in the platform code, how to I
>> free it when the driver is unloaded. 
> 
> This is what I said in my last e-mail. What is
> the issue you see with this approach?
> 
> | Thanks for the clarification. In this case, the driver
> | should use platform callbacks to get/put fast fifo
> | space. In case this callback is not populated by the
> | platform or returns an error, the driver should fall
> | back to allocating from DDR.
> 

ok, so what you are suggesting is that I implement some
callbacks (like .fifo_alloc, .fifo_dealloc) which can allocate
memory using sram_alloc.
My doubt is, if already such API's are there (by Russel) or you
are suggesting to implement them.
 

[PATCH v4 08/11] tty: add pruss SUART driver

[Subhasish Ghosh]

>> 
>> Say, if the driver is loaded as a module.
>> If I allocate the sram in the platform code, how to I
>> free it when the driver is unloaded. 
> 
> This is what I said in my last e-mail. What is
> the issue you see with this approach?
> 
> | Thanks for the clarification. In this case, the driver
> | should use platform callbacks to get/put fast fifo
> | space. In case this callback is not populated by the
> | platform or returns an error, the driver should fall
> | back to allocating from DDR.
> 

ok, so what you are suggesting is that I implement some
callbacks (like .fifo_alloc, .fifo_dealloc) which can allocate
memory using sram_alloc.
My doubt is, if already such API's are there (by Russel) or you
are suggesting to implement them.
 

Re: [PATCH v4 08/11] tty: add pruss SUART driver

[Alan Cox]

> We do not support Modem control signals. So, I use -clocal with stty,
> but I observe that still enable_ms and get_mctrl handlers get called.
> Is that normal, how can I disable these functions from getting called.

It is normal.

> Actually, this same driver works perfectly with 2.6.33 kernel.
> With this Kernel I do not observe that these handlers getting called.
> So, basically the code path is different.

Quite possibly - but you'll need to trace down and understand *why* the
problem exists. Finding which kernel introduces it might be a step in the
right direction.

Alan

[PATCH v4 08/11] tty: add pruss SUART driver

[Alan Cox]

> We do not support Modem control signals. So, I use -clocal with stty,
> but I observe that still enable_ms and get_mctrl handlers get called.
> Is that normal, how can I disable these functions from getting called.

It is normal.

> Actually, this same driver works perfectly with 2.6.33 kernel.
> With this Kernel I do not observe that these handlers getting called.
> So, basically the code path is different.

Quite possibly - but you'll need to trace down and understand *why* the
problem exists. Finding which kernel introduces it might be a step in the
right direction.

Alan

Re: [PATCH v4 08/11] tty: add pruss SUART driver

[Subhasish Ghosh]

> Trace all looks fine. I can't see anything else taking the lock so you'll
> need to do a bit more debugging and find out why the spin lock change
> makes the difference and what the real root cause is.

We do not support Modem control signals. So, I use -clocal with stty,
but I observe that still enable_ms and get_mctrl handlers get called.
Is that normal, how can I disable these functions from getting called.

Actually, this same driver works perfectly with 2.6.33 kernel.
With this Kernel I do not observe that these handlers getting called.
So, basically the code path is different.

Further, I only use the port->lock to disable interrupts, so its never 
possible that
while interrupts are disabled by my driver, the TTY is executing anything.

There is another lock in the MFD driver, but that only uses spin_lock/unlock
variant. 

[PATCH v4 08/11] tty: add pruss SUART driver

[Subhasish Ghosh]

> Trace all looks fine. I can't see anything else taking the lock so you'll
> need to do a bit more debugging and find out why the spin lock change
> makes the difference and what the real root cause is.

We do not support Modem control signals. So, I use -clocal with stty,
but I observe that still enable_ms and get_mctrl handlers get called.
Is that normal, how can I disable these functions from getting called.

Actually, this same driver works perfectly with 2.6.33 kernel.
With this Kernel I do not observe that these handlers getting called.
So, basically the code path is different.

Further, I only use the port->lock to disable interrupts, so its never 
possible that
while interrupts are disabled by my driver, the TTY is executing anything.

There is another lock in the MFD driver, but that only uses spin_lock/unlock
variant. 

Re: [PATCH v4 08/11] tty: add pruss SUART driver

[Alan Cox]

Trace all looks fine. I can't see anything else taking the lock so you'll
need to do a bit more debugging and find out why the spin lock change
makes the difference and what the real root cause is.

[PATCH v4 08/11] tty: add pruss SUART driver

[Alan Cox]

Trace all looks fine. I can't see anything else taking the lock so you'll
need to do a bit more debugging and find out why the spin lock change
makes the difference and what the real root cause is.

RE: [PATCH v4 08/11] tty: add pruss SUART driver

[Nori, Sekhar]

On Tue, May 10, 2011 at 16:24:35, Subhasish Ghosh wrote:
> >> 
> >> >>The driver should probably just get sram
> >> >> space through platform data so that it doesn't depend on the
> >> >> platform specific sram allocation function.
> >> 
> >> Are you suggesting that I go back to that implementation.
> > 
> > No, the platform code should use the SRAM allocator and
> > pass on the allocated memory to the driver.
> > 
> 
> Say, if the driver is loaded as a module.
> If I allocate the sram in the platform code, how to I
> free it when the driver is unloaded. 

This is what I said in my last e-mail. What is
the issue you see with this approach?

| Thanks for the clarification. In this case, the driver
| should use platform callbacks to get/put fast fifo
| space. In case this callback is not populated by the
| platform or returns an error, the driver should fall
| back to allocating from DDR.

Thanks,
Sekhar

[PATCH v4 08/11] tty: add pruss SUART driver

[Nori, Sekhar]

On Tue, May 10, 2011 at 16:24:35, Subhasish Ghosh wrote:
> >> 
> >> >>The driver should probably just get sram
> >> >> space through platform data so that it doesn't depend on the
> >> >> platform specific sram allocation function.
> >> 
> >> Are you suggesting that I go back to that implementation.
> > 
> > No, the platform code should use the SRAM allocator and
> > pass on the allocated memory to the driver.
> > 
> 
> Say, if the driver is loaded as a module.
> If I allocate the sram in the platform code, how to I
> free it when the driver is unloaded. 

This is what I said in my last e-mail. What is
the issue you see with this approach?

| Thanks for the clarification. In this case, the driver
| should use platform callbacks to get/put fast fifo
| space. In case this callback is not populated by the
| platform or returns an error, the driver should fall
| back to allocating from DDR.

Thanks,
Sekhar

Re: [PATCH v4 08/11] tty: add pruss SUART driver

[Subhasish Ghosh]

>> 
>> >>The driver should probably just get sram
>> >> space through platform data so that it doesn't depend on the
>> >> platform specific sram allocation function.
>> 
>> Are you suggesting that I go back to that implementation.
> 
> No, the platform code should use the SRAM allocator and
> pass on the allocated memory to the driver.
> 

Say, if the driver is loaded as a module.
If I allocate the sram in the platform code, how to I
free it when the driver is unloaded. 

[PATCH v4 08/11] tty: add pruss SUART driver

[Subhasish Ghosh]

>> 
>> >>The driver should probably just get sram
>> >> space through platform data so that it doesn't depend on the
>> >> platform specific sram allocation function.
>> 
>> Are you suggesting that I go back to that implementation.
> 
> No, the platform code should use the SRAM allocator and
> pass on the allocated memory to the driver.
> 

Say, if the driver is loaded as a module.
If I allocate the sram in the platform code, how to I
free it when the driver is unloaded. 

Re: [PATCH v4 08/11] tty: add pruss SUART driver

[Subhasish Ghosh]

Hi Alan,

>> >> I then modified this function to as follows and the error is not 
>> >> observed
>> >> anymore.
>> >
>> > That looks like you are somehow calling uart_carrier_raised somewhere
>> > with interrupts disabled ?
>> >
>> I am not calling this function in my driver atall, this is getting called 
>> by
>> tty_port.c
>
> Can you verify the status of the interrupt flags at the point that
> routine is called in your code and get a backtrace of the path. It
> should never be gettng called with interrupts off, and if it is we need
> to know what the path is. Otherwise that code change would imply a bug
> in the core code for the platform which seems less likely.

Here is the back trace:

root@arago:~# ------------[ cut here ]------------
WARNING: at drivers/tty/serial/pruss_suart.c:295 
uart_carrier_raised+0x2c/0x74()
Modules linked in: pruss_uart
[<c002e888>] (unwind_backtrace+0x0/0xec) from [<c003e400>] 
(warn_slowpath_common+0x4c/0x64)
[<c003e400>] (warn_slowpath_common+0x4c/0x64) from [<c003e430>] 
(warn_slowpath_null+0x18/0x1c)
[<c003e430>] (warn_slowpath_null+0x18/0x1c) from [<c0190744>] 
(uart_carrier_raised+0x2c/0x74)
[<c0190744>] (uart_carrier_raised+0x2c/0x74) from [<c0182b84>] 
(tty_port_carrier_raised+0x1c/0x20)
[<c0182b84>] (tty_port_carrier_raised+0x1c/0x20) from [<c0183174>] 
(tty_port_block_til_ready+0x254/0x328)
[<c0183174>] (tty_port_block_til_ready+0x254/0x328) from [<c017d3ac>] 
(tty_open+0x310/0x478)
[<c017d3ac>] (tty_open+0x310/0x478) from [<c009f5d8>] 
(chrdev_open+0x1b4/0x1d0)
[<c009f5d8>] (chrdev_open+0x1b4/0x1d0) from [<c009ae34>] 
(__dentry_open+0x170/0x27c)
[<c009ae34>] (__dentry_open+0x170/0x27c) from [<c009b008>] 
(nameidata_to_filp+0x50/0x5c)
[<c009b008>] (nameidata_to_filp+0x50/0x5c) from [<c00a70e0>] 
(finish_open+0x90/0x17c)
[<c00a70e0>] (finish_open+0x90/0x17c) from [<c00a8fa4>] 
(do_filp_open+0x23c/0x520)
[<c00a8fa4>] (do_filp_open+0x23c/0x520) from [<c009ac0c>] 
(do_sys_open+0x58/0xe4)
[<c009ac0c>] (do_sys_open+0x58/0xe4) from [<c0029fa0>] 
(ret_fast_syscall+0x0/0x2c)

flags ---> 0xA0000013


This is how I generated the trace:

static void pruss_suart_enable_ms(struct uart_port *port)
{
        struct omapl_pru_suart *soft_uart =
            container_of(port, struct omapl_pru_suart, port[port->line]);
        struct device *dev = soft_uart->dev;

        WARN_ON(1);
        dev_dbg(dev, "modem control timer not supported\n");
} 

[PATCH v4 08/11] tty: add pruss SUART driver

[Subhasish Ghosh]

Hi Alan,

>> >> I then modified this function to as follows and the error is not 
>> >> observed
>> >> anymore.
>> >
>> > That looks like you are somehow calling uart_carrier_raised somewhere
>> > with interrupts disabled ?
>> >
>> I am not calling this function in my driver atall, this is getting called 
>> by
>> tty_port.c
>
> Can you verify the status of the interrupt flags at the point that
> routine is called in your code and get a backtrace of the path. It
> should never be gettng called with interrupts off, and if it is we need
> to know what the path is. Otherwise that code change would imply a bug
> in the core code for the platform which seems less likely.

Here is the back trace:

root at arago:~# ------------[ cut here ]------------
WARNING: at drivers/tty/serial/pruss_suart.c:295 
uart_carrier_raised+0x2c/0x74()
Modules linked in: pruss_uart
[<c002e888>] (unwind_backtrace+0x0/0xec) from [<c003e400>] 
(warn_slowpath_common+0x4c/0x64)
[<c003e400>] (warn_slowpath_common+0x4c/0x64) from [<c003e430>] 
(warn_slowpath_null+0x18/0x1c)
[<c003e430>] (warn_slowpath_null+0x18/0x1c) from [<c0190744>] 
(uart_carrier_raised+0x2c/0x74)
[<c0190744>] (uart_carrier_raised+0x2c/0x74) from [<c0182b84>] 
(tty_port_carrier_raised+0x1c/0x20)
[<c0182b84>] (tty_port_carrier_raised+0x1c/0x20) from [<c0183174>] 
(tty_port_block_til_ready+0x254/0x328)
[<c0183174>] (tty_port_block_til_ready+0x254/0x328) from [<c017d3ac>] 
(tty_open+0x310/0x478)
[<c017d3ac>] (tty_open+0x310/0x478) from [<c009f5d8>] 
(chrdev_open+0x1b4/0x1d0)
[<c009f5d8>] (chrdev_open+0x1b4/0x1d0) from [<c009ae34>] 
(__dentry_open+0x170/0x27c)
[<c009ae34>] (__dentry_open+0x170/0x27c) from [<c009b008>] 
(nameidata_to_filp+0x50/0x5c)
[<c009b008>] (nameidata_to_filp+0x50/0x5c) from [<c00a70e0>] 
(finish_open+0x90/0x17c)
[<c00a70e0>] (finish_open+0x90/0x17c) from [<c00a8fa4>] 
(do_filp_open+0x23c/0x520)
[<c00a8fa4>] (do_filp_open+0x23c/0x520) from [<c009ac0c>] 
(do_sys_open+0x58/0xe4)
[<c009ac0c>] (do_sys_open+0x58/0xe4) from [<c0029fa0>] 
(ret_fast_syscall+0x0/0x2c)

flags ---> 0xA0000013


This is how I generated the trace:

static void pruss_suart_enable_ms(struct uart_port *port)
{
        struct omapl_pru_suart *soft_uart =
            container_of(port, struct omapl_pru_suart, port[port->line]);
        struct device *dev = soft_uart->dev;

        WARN_ON(1);
        dev_dbg(dev, "modem control timer not supported\n");
} 

Re: [PATCH v4 08/11] tty: add pruss SUART driver

[Alan Cox]

On Mon, 9 May 2011 19:20:17 +0530
"Subhasish Ghosh" <subhasish@mistralsolutions.com> wrote:

> >> I then modified this function to as follows and the error is not observed
> >> anymore.
> >
> > That looks like you are somehow calling uart_carrier_raised somewhere
> > with interrupts disabled ?
> >
> I am not calling this function in my driver atall, this is getting called by 
> tty_port.c

Can you verify the status of the interrupt flags at the point that
routine is called in your code and get a backtrace of the path. It
should never be gettng called with interrupts off, and if it is we need
to know what the path is. Otherwise that code change would imply a bug
in the core code for the platform which seems less likely.
 

[PATCH v4 08/11] tty: add pruss SUART driver

[Alan Cox]

On Mon, 9 May 2011 19:20:17 +0530
"Subhasish Ghosh" <subhasish@mistralsolutions.com> wrote:

> >> I then modified this function to as follows and the error is not observed
> >> anymore.
> >
> > That looks like you are somehow calling uart_carrier_raised somewhere
> > with interrupts disabled ?
> >
> I am not calling this function in my driver atall, this is getting called by 
> tty_port.c

Can you verify the status of the interrupt flags at the point that
routine is called in your code and get a backtrace of the path. It
should never be gettng called with interrupts off, and if it is we need
to know what the path is. Otherwise that code change would imply a bug
in the core code for the platform which seems less likely.
 

Re: [PATCH v4 08/11] tty: add pruss SUART driver

[Subhasish Ghosh]

>> I then modified this function to as follows and the error is not observed
>> anymore.
>
> That looks like you are somehow calling uart_carrier_raised somewhere
> with interrupts disabled ?
>
I am not calling this function in my driver atall, this is getting called by 
tty_port.c

int tty_port_block_til_ready(struct tty_port *port,
                                struct tty_struct *tty, struct file *filp)
{
 /* Probe the carrier. For devices with no carrier detect this
                   will always return true */
                cd = tty_port_carrier_raised(port);
                if (!(port->flags & ASYNC_CLOSING) &&
                                (do_clocal || cd))
                        break;
                if (signal_pending(current)) {
                        retval = -ERESTARTSYS;
                        break;
                }

 

[PATCH v4 08/11] tty: add pruss SUART driver

[Subhasish Ghosh]

>> I then modified this function to as follows and the error is not observed
>> anymore.
>
> That looks like you are somehow calling uart_carrier_raised somewhere
> with interrupts disabled ?
>
I am not calling this function in my driver atall, this is getting called by 
tty_port.c

int tty_port_block_til_ready(struct tty_port *port,
                                struct tty_struct *tty, struct file *filp)
{
 /* Probe the carrier. For devices with no carrier detect this
                   will always return true */
                cd = tty_port_carrier_raised(port);
                if (!(port->flags & ASYNC_CLOSING) &&
                                (do_clocal || cd))
                        break;
                if (signal_pending(current)) {
                        retval = -ERESTARTSYS;
                        break;
                }

 

Re: [PATCH v4 08/11] tty: add pruss SUART driver

[Alan Cox]

> I then modified this function to as follows and the error is not observed 
> anymore.

That looks like you are somehow calling uart_carrier_raised somewhere
with interrupts disabled ?

Alan

[PATCH v4 08/11] tty: add pruss SUART driver

[Alan Cox]

> I then modified this function to as follows and the error is not observed 
> anymore.

That looks like you are somehow calling uart_carrier_raised somewhere
with interrupts disabled ?

Alan

Re: [PATCH v4 08/11] tty: add pruss SUART driver

[Subhasish Ghosh]

Hi Greg,

I am observing a RX FIFO sized data loss problem with my driver.

I observed that if I start the TX before the RX, then there are no errors,
but, if I start a TX after a RX, then I observe the error (FIFO sized data 
chunks missing).

Say, for example, if I use all three UARTS and on all three I start RX, then 
for every TX started I would observe
one error on all the RX data buffer.

So, if I start only two TX, then I will see only two errors on all the three 
RX UARTS.

>From this observation I concluded that somehow the TX start was effecting 
the RX.
So, I disabled the complete TX section in the driver, but even when the 
complete TX was disabled
I observed the same errors in RX.

>From here I concluded that the error was happening before my drivers TX 
routine was getting called.
I traced it down to the below function, this is a sub-system specific 
function in the file serial-core.c

static int uart_carrier_raised(struct tty_port *port)
{
        struct uart_state *state = container_of(port, struct uart_state, 
port);
        struct uart_port *uport = state->uart_port;
        int mctrl;

        spin_lock_irq(&uport->lock);
        uport->ops->enable_ms(uport);
        mctrl = uport->ops->get_mctrl(uport);
        spin_unlock_irq(&uport->lock);
        if (mctrl & TIOCM_CAR) {
                return 1;
        }
        return 0;
}

In this function I moved the "return 1" to the beginning of the function, 
this solved the bug that we are having. There was no data loss.

I think, the two spin locks used in this function is somehow effecting the 
RX.

I then modified this function to as follows and the error is not observed 
anymore.

static int uart_carrier_raised(struct tty_port *port)
{
        struct uart_state *state = container_of(port, struct uart_state, 
port);
        struct uart_port *uport = state->uart_port;
        int mctrl;
        unsigned long flags = 0;

        spin_lock_irqsave(&uport->lock, flags);
        uport->ops->enable_ms(uport);
        mctrl = uport->ops->get_mctrl(uport);
        spin_unlock_irqrestore(&uport->lock, flags);
        if (mctrl & TIOCM_CAR) {
                return 1;
        }
        return 0;
}

Is this a BUG in the TTY sub-system or am I doing something wrong in my 
driver.

I also changed one driver function to as follows:

static u32 pruss_suart_get_mctrl(struct uart_port *port)
{
        return TIOCM_CAR;
}

Best Regards,
Subhasish Ghosh
--------------------------------------------------
From: "Subhasish Ghosh" <subhasish@mistralsolutions.com>
Sent: Friday, April 22, 2011 5:38 PM
To: <davinci-linux-open-source@linux.davincidsp.com>
Cc: <linux-arm-kernel@lists.infradead.org>; <m-watkins@ti.com>; 
<nsekhar@ti.com>; <sachi@mistralsolutions.com>; "Subhasish Ghosh" 
<subhasish@mistralsolutions.com>; "Greg Kroah-Hartman (maintainer:TTY 
LAYER,commit_signer:2/4=50%,commit_signer:1/2=50%)" <gregkh@suse.de>; 
"Andrew Morton (commit_signer:1/4=25%)" <akpm@linux-foundation.org>; "Randy 
Dunlap (commit_signer:1/4=25%)" <randy.dunlap@oracle.com>; "open list" 
<linux-kernel@vger.kernel.org>
Subject: [PATCH v4 08/11] tty: add pruss SUART driver

> This patch adds support for the TTY compliant
> Soft-UART device emulated on PRUSS.
>
> This patch depends on:
> davinci: macro rename DA8XX_LPSC0_DMAX to DA8XX_LPSC0_PRUSS.
>            https://patchwork.kernel.org/patch/615681/
> davinci: changed SRAM allocator to shared ram.
>            https://patchwork.kernel.org/patch/549351/
>
> Signed-off-by: Subhasish Ghosh <subhasish@mistralsolutions.com>
> ---
> drivers/tty/serial/Kconfig             |   18 +
> drivers/tty/serial/Makefile            |    6 +
> drivers/tty/serial/pruss_suart.c       | 1061 ++++++++++++++++++++
> drivers/tty/serial/pruss_suart.h       | 1038 +++++++++++++++++++
> drivers/tty/serial/pruss_suart_api.c   | 1710 
> ++++++++++++++++++++++++++++++++
> drivers/tty/serial/pruss_suart_utils.c |  393 ++++++++
> include/linux/serial_core.h            |    2 +
> 7 files changed, 4228 insertions(+), 0 deletions(-)
> create mode 100644 drivers/tty/serial/pruss_suart.c
> create mode 100644 drivers/tty/serial/pruss_suart.h
> create mode 100644 drivers/tty/serial/pruss_suart_api.c
> create mode 100644 drivers/tty/serial/pruss_suart_utils.c
>
> diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
> index 2b83346..6c26ebf 100644
> --- a/drivers/tty/serial/Kconfig
> +++ b/drivers/tty/serial/Kconfig
> @@ -1596,4 +1596,22 @@ config SERIAL_PCH_UART
>    This driver is for PCH(Platform controller Hub) UART of Intel EG20T
>    which is an IOH(Input/Output Hub) for x86 embedded processor.
>    Enabling PCH_DMA, this PCH UART works as DMA mode.
> +
> +config SERIAL_PRUSS_SUART
> + depends on ARCH_DAVINCI && ARCH_DAVINCI_DA850
> + select SERIAL_CORE
> + tristate "PRUSS based SoftUART emulation on DA8XX"
> + ---help---
> + This driver emulates up to eight different UARTs on the PRUSS.
> + You may modify the NR_SUARTS macro in the driver to emulate
> + less number of UARTS as per your requirement.
> + If not sure, mark No
> +
> +config PRUSS_SUART_MCASP
> + depends on ARCH_DAVINCI_DA830 && SERIAL_PRUSS_SUART
> + default "0"
> + int "McASP number"
> + ---help---
> + Enter the McASP number to use with SUART (0, 1 or 2).
> + You will need to recompile the kernel if this is changed.
> endmenu
> diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile
> index 8ea92e9..e1eaaf3 100644
> --- a/drivers/tty/serial/Makefile
> +++ b/drivers/tty/serial/Makefile
> @@ -92,3 +92,9 @@ obj-$(CONFIG_SERIAL_MRST_MAX3110) += mrst_max3110.o
> obj-$(CONFIG_SERIAL_MFD_HSU) += mfd.o
> obj-$(CONFIG_SERIAL_IFX6X60)  += ifx6x60.o
> obj-$(CONFIG_SERIAL_PCH_UART) += pch_uart.o
> +
> +pruss_uart-objs := pruss_suart.o \
> + pruss_suart_api.o \
> + pruss_suart_utils.o
> +
> +obj-$(CONFIG_SERIAL_PRUSS_SUART) += pruss_uart.o
> diff --git a/drivers/tty/serial/pruss_suart.c 
> b/drivers/tty/serial/pruss_suart.c
> new file mode 100644
> index 0000000..37c3c21
> --- /dev/null
> +++ b/drivers/tty/serial/pruss_suart.c
> @@ -0,0 +1,1061 @@
> +/*
> + * PRUSS SUART Emulation device driver
> + * Author: subhasish@mistralsolutions.com
> + *
> + * This driver supports TI's PRU SUART Emulation and the
> + * specs for the same is available at <http://www.ti.com>
> + *
> + * Copyright (C) 2010, 2011 Texas Instruments Incorporated 
> <http://www.ti.com/>
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License as
> + * published by the Free Software Foundation version 2.
> + *
> + * This program is distributed as is WITHOUT ANY WARRANTY of any
> + * kind, whether express or implied; without even the implied warranty
> + * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/errno.h>
> +#include <linux/init.h>
> +#include <linux/slab.h>
> +#include <linux/tty.h>
> +#include <linux/tty_flip.h>
> +#include <linux/serial.h>
> +#include <linux/serial_core.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/firmware.h>
> +#include <linux/clk.h>
> +#include <linux/serial_reg.h>
> +#include <linux/delay.h>
> +#include <linux/bitops.h>
> +#include <mach/sram.h>
> +#include "pruss_suart.h"
> +
> +#define NR_SUART 8
> +#define DRV_NAME "da8xx_pruss_uart"
> +#define DRV_DESC "PRUSS SUART Driver v1.0"
> +#define MAX_SUART_RETRIES 100
> +#define SUART_CNTX_SZ 512
> +#define SUART_FIFO_TIMEOUT_DFLT 5
> +#define SUART_FIFO_TIMEOUT_MIN 4
> +#define SUART_FIFO_TIMEOUT_MAX 500
> +
> +/* Default timeout set to 5ms */
> +static s16 suart_timeout = SUART_FIFO_TIMEOUT_DFLT;
> +module_param(suart_timeout, short, S_IRUGO);
> +MODULE_PARM_DESC(suart_timeout,
> + "fifo timeout in milli seconds (min: 4; max: 500)");
> +
> +struct suart_fifo {
> + void *fifo_vaddr_buff_tx;
> + void *fifo_vaddr_buff_rx;
> + void *fifo_phys_addr_tx;
> + void *fifo_phys_addr_rx;
> +};
> +
> +struct omapl_pru_suart {
> + struct uart_port port[NR_SUART];
> + struct device *dev;
> + unsigned long tx_empty[NR_SUART];
> + struct clk *clk_mcasp;
> + struct suart_fifo suart_fifo_addr[NR_SUART];
> + struct suart_handle suart_hdl[NR_SUART];
> + struct pruss_suart_iomap suart_iomap;
> + struct tasklet_struct tx_task[NR_SUART];
> + u32 clk_freq_pru;
> + u32 clk_freq_mcasp;
> + u32 tx_loadsz;
> +};
> +
> +static u32 suart_get_duplex(struct omapl_pru_suart *soft_uart, u32 
> uart_no)
> +{
> + return soft_uart->suart_hdl[uart_no].uart_type;
> +}
> +
> +static inline void __stop_tx(struct omapl_pru_suart *soft_uart, u32 
> uart_no)
> +{
> + struct device *dev = soft_uart->dev;
> + unsigned long flags = 0;
> + struct uart_port *port = &soft_uart->port[uart_no];
> + u16 txready;
> + u32 i;
> +
> + /* Check if any TX in progress */
> + for (i = 0, txready = 1; (i < 10000) && txready; i++) {
> + txready = (pru_softuart_get_tx_status
> + (dev, &soft_uart->suart_hdl[uart_no]) &
> + CHN_TXRX_STATUS_RDY);
> + }
> + /* To stop tx, disable the TX interrupt */
> + spin_lock_irqsave(&port->lock, flags);
> + suart_intr_clrmask(dev, soft_uart->suart_hdl[uart_no].uart_num,
> + PRU_TX_INTR, CHN_TXRX_IE_MASK_CMPLT);
> + pru_softuart_clr_tx_status(dev, &soft_uart->suart_hdl[uart_no]);
> + spin_unlock_irqrestore(&port->lock, flags);
> +}
> +
> +static void pruss_suart_stop_tx(struct uart_port *port)
> +{
> + struct omapl_pru_suart *soft_uart =
> +     container_of(port, struct omapl_pru_suart, port[port->line]);
> +
> + __stop_tx(soft_uart, port->line);
> +}
> +
> +static void omapl_pru_tx_chars(struct omapl_pru_suart *soft_uart, u32 
> uart_no)
> +{
> + struct circ_buf *xmit = &soft_uart->port[uart_no].state->xmit;
> + struct device *dev = soft_uart->dev;
> + s32 count = 0;
> +
> + if (!(suart_get_duplex(soft_uart, uart_no) & ePRU_SUART_HALF_TX))
> + return;
> +
> + if (uart_circ_empty(xmit) ||
> + uart_tx_stopped(&soft_uart->port[uart_no])) {
> + pruss_suart_stop_tx(&soft_uart->port[uart_no]);
> + set_bit(0, &soft_uart->tx_empty[uart_no]);
> + return;
> + }
> +
> + for (count = 0; count <= soft_uart->tx_loadsz; count++) {
> + *((s8 *)soft_uart->suart_fifo_addr[uart_no].fifo_vaddr_buff_tx
> + + count) = xmit->buf[xmit->tail];
> + xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
> + soft_uart->port[uart_no].icount.tx++;
> + if (uart_circ_empty(xmit)) {
> + uart_circ_clear(xmit);
> + break;
> + }
> + }
> +
> + if (count == (SUART_FIFO_LEN + 1))
> + count = SUART_FIFO_LEN;
> +
> + /* Write the character to the data port */
> + if (pru_softuart_write(dev,
> + &soft_uart->suart_hdl[uart_no],
> + (u32 *)&soft_uart->suart_fifo_addr
> + [uart_no].fifo_phys_addr_tx, count) != 0) {
> + dev_err(dev, "failed to tx data\n");
> + }
> +
> + if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
> + uart_write_wakeup(&soft_uart->port[uart_no]);
> +
> +#if 0
> + if (uart_circ_empty(xmit))
> + __stop_tx(soft_uart, uart_no);
> +#endif
> +}
> +
> +static void suart_tx_task(unsigned long data)
> +{
> + struct uart_port *port = (struct uart_port *)data;
> + struct omapl_pru_suart *soft_uart =
> + container_of(port, struct omapl_pru_suart, port[port->line]);
> +
> + omapl_pru_tx_chars(soft_uart, port->line);
> +}
> +
> +static void omapl_pru_rx_chars(struct omapl_pru_suart *soft_uart, u32 
> uart_no)
> +{
> + struct tty_struct *tty = NULL;
> + struct device *dev = soft_uart->dev;
> + s8 flags = TTY_NORMAL;
> + u16 rx_status, data_len = SUART_FIFO_LEN;
> + u32 data_len_read;
> + u8 suart_data[SUART_FIFO_LEN + 1];
> + s32 i = 0;
> +
> + if (!(suart_get_duplex(soft_uart, uart_no) & ePRU_SUART_HALF_RX))
> + return;
> +
> + /* read the status */
> + rx_status = pru_softuart_get_rx_status(dev,
> + &soft_uart->suart_hdl[uart_no]);
> +
> + pru_softuart_read_data(dev, &soft_uart->suart_hdl[uart_no],
> + suart_data, data_len + 1, &data_len_read);
> +
> + tty = tty_port_tty_get(&soft_uart->port[uart_no].state->port);
> +
> + if (!tty)
> + return;
> +
> + /* check for errors */
> + if (rx_status & CHN_TXRX_STATUS_ERR) {
> + if (rx_status & CHN_TXRX_STATUS_FE)
> + soft_uart->port[uart_no].icount.frame++;
> + if (rx_status & CHN_TXRX_STATUS_OVRNERR)
> + soft_uart->port[uart_no].icount.overrun++;
> + if (rx_status & CHN_TXRX_STATUS_BI)
> + soft_uart->port[uart_no].icount.brk++;
> + rx_status &= soft_uart->port[uart_no].
> + read_status_mask;
> + if (rx_status & CHN_TXRX_STATUS_FE)
> + flags = TTY_FRAME;
> + if (rx_status & CHN_TXRX_STATUS_OVRNERR)
> + flags = TTY_OVERRUN;
> + if (rx_status & CHN_TXRX_STATUS_BI)
> + flags = TTY_BREAK;
> +
> +#ifdef SUPPORT_SYSRQ
> + soft_uart->port[uart_no].sysrq = 0;
> +#endif
> + } else {
> + for (i = 0; i <= data_len_read; i++) {
> + soft_uart->port[uart_no].icount.rx++;
> + /* check for sys rq */
> + if (uart_handle_sysrq_char
> +     (&soft_uart->port[uart_no], suart_data))
> + continue;
> + }
> + tty_insert_flip_string(tty, suart_data, data_len_read);
> + }
> +
> + /* push data into tty */
> + pru_softuart_clr_rx_status(dev, &soft_uart->suart_hdl[uart_no]);
> + tty_flip_buffer_push(tty);
> + tty_kref_put(tty);
> +}
> +
> +static irqreturn_t pruss_suart_interrupt(s32 irq, void *dev_id)
> +{
> + struct uart_port *port = dev_id;
> + struct omapl_pru_suart *soft_uart =
> + container_of(port, struct omapl_pru_suart, port[port->line]);
> + struct device *dev = soft_uart->dev;
> + u16 txrx_flag;
> + u32 ret;
> + unsigned long flags = 0;
> + u16 uart_num = port->line + 1;
> +
> + spin_lock_irqsave(&port->lock, flags);
> +
> + do {
> + ret = pru_softuart_get_isrstatus(dev, uart_num, &txrx_flag);
> + if (ret != 0) {
> + dev_err(dev, "suart%d: failed to get interrupt, ret:"
> + " 0x%X txrx_flag 0x%X\n",
> + port->line, ret, txrx_flag);
> + spin_unlock_irqrestore(&port->lock, flags);
> + return IRQ_NONE;
> + }
> + if ((PRU_RX_INTR & txrx_flag) == PRU_RX_INTR) {
> + pru_intr_clr_isrstatus(dev, uart_num, PRU_RX_INTR);
> + if ((soft_uart->port[port->line].ignore_status_mask &
> + CHN_TXRX_STATUS_RDY) == CHN_TXRX_STATUS_RDY) {
> + pru_softuart_clr_rx_status(dev,
> + &soft_uart->suart_hdl
> + [port->line]);
> + } else {
> + omapl_pru_rx_chars(soft_uart, port->line);
> + }
> + }
> +
> + if ((PRU_TX_INTR & txrx_flag) == PRU_TX_INTR) {
> + pru_intr_clr_isrstatus(dev, uart_num, PRU_TX_INTR);
> + pru_softuart_clr_tx_status(dev, &soft_uart->suart_hdl
> + [port->line]);
> + tasklet_schedule(&soft_uart->tx_task[port->line]);
> + }
> + } while (txrx_flag & (PRU_RX_INTR | PRU_TX_INTR));
> +
> + spin_unlock_irqrestore(&port->lock, flags);
> + return IRQ_HANDLED;
> +}
> +
> +static void pruss_suart_stop_rx(struct uart_port *port)
> +{
> + struct omapl_pru_suart *soft_uart =
> +     container_of(port, struct omapl_pru_suart, port[port->line]);
> + struct device *dev = soft_uart->dev;
> + unsigned long flags = 0;
> +
> + spin_lock_irqsave(&port->lock, flags);
> + /* disable rx interrupt */
> + suart_intr_clrmask(dev, soft_uart->suart_hdl[port->line].uart_num,
> +    PRU_RX_INTR, CHN_TXRX_IE_MASK_BI
> +    | CHN_TXRX_IE_MASK_FE | CHN_TXRX_IE_MASK_CMPLT
> +    | CHN_TXRX_IE_MASK_TIMEOUT);
> + spin_unlock_irqrestore(&port->lock, flags);
> +}
> +
> +static void pruss_suart_enable_ms(struct uart_port *port)
> +{
> + struct omapl_pru_suart *soft_uart =
> +     container_of(port, struct omapl_pru_suart, port[port->line]);
> + struct device *dev = soft_uart->dev;
> + dev_err(dev, "modem control timer not supported\n");
> +}
> +
> +static void pruss_suart_start_tx(struct uart_port *port)
> +{
> + struct omapl_pru_suart *soft_uart =
> +     container_of(port, struct omapl_pru_suart, port[port->line]);
> + struct device *dev = soft_uart->dev;
> + unsigned long flags = 0;
> +
> + /* unmask the tx interrupts */
> + spin_lock_irqsave(&port->lock, flags);
> + suart_intr_setmask(dev, soft_uart->suart_hdl[port->line].uart_num,
> +    PRU_TX_INTR, CHN_TXRX_IE_MASK_CMPLT);
> + spin_unlock_irqrestore(&port->lock, flags);
> +
> + if (test_and_clear_bit(0, &soft_uart->tx_empty[port->line]))
> + omapl_pru_tx_chars(soft_uart, port->line);
> +}
> +
> +static u32 pruss_suart_tx_empty(struct uart_port *port)
> +{
> + struct omapl_pru_suart *soft_uart =
> +     container_of(port, struct omapl_pru_suart, port[port->line]);
> + struct device *dev = soft_uart->dev;
> +
> + return (pru_softuart_get_tx_status(dev,
> + &soft_uart->suart_hdl[port->line])
> + & CHN_TXRX_STATUS_RDY) ? 0 : TIOCSER_TEMT;
> +}
> +
> +static u32 pruss_suart_get_mctrl(struct uart_port *port)
> +{
> + return -ENOTSUPP;
> +}
> +
> +static void pruss_suart_set_mctrl(struct uart_port *port, u32 mctrl)
> +{
> + struct omapl_pru_suart *soft_uart =
> +     container_of(port, struct omapl_pru_suart, port[port->line]);
> + struct device *dev = soft_uart->dev;
> + dev_dbg(dev, "modem control not supported\n");
> +}
> +
> +static void pruss_suart_break_ctl(struct uart_port *port, s32 
> break_state)
> +{
> + struct omapl_pru_suart *soft_uart =
> +     container_of(port, struct omapl_pru_suart, port[port->line]);
> + struct device *dev = soft_uart->dev;
> + unsigned long flags = 0;
> +
> + spin_lock_irqsave(&port->lock, flags);
> +
> + if (break_state == -1)
> + suart_intr_clrmask(dev,
> + soft_uart->suart_hdl[port->line].uart_num,
> + PRU_RX_INTR, CHN_TXRX_IE_MASK_BI);
> + else
> + suart_intr_setmask(dev,
> + soft_uart->suart_hdl[port->line].uart_num,
> + PRU_RX_INTR, CHN_TXRX_IE_MASK_BI);
> +
> + spin_unlock_irqrestore(&port->lock, flags);
> +}
> +
> +static void pruss_suart_set_termios(struct uart_port *port,
> +   struct ktermios *termios,
> +   struct ktermios *old)
> +{
> + struct omapl_pru_suart *soft_uart =
> +     container_of(port, struct omapl_pru_suart, port[port->line]);
> + struct device *dev = soft_uart->dev;
> + u8 cval = 0;
> + unsigned long flags = 0;
> + u32 baud = 0;
> + u32 old_csize = old ? old->c_cflag & CSIZE : CS8;
> +
> +/*
> + * Do not allow unsupported configurations to be set
> + */
> + if (1) {
> + termios->c_cflag &= ~(CRTSCTS | CMSPAR | CSTOPB
> +       | PARENB | PARODD | CMSPAR);
> + }
> +
> + switch (termios->c_cflag & CSIZE) {
> + case CS6:
> + cval = ePRU_SUART_DATA_BITS6;
> + break;
> + case CS7:
> + cval = ePRU_SUART_DATA_BITS7;
> + break;
> + default:
> + case CS8:
> + cval = ePRU_SUART_DATA_BITS8;
> + break;
> + }
> + /*
> + * We do not support CS5.
> + */
> + if ((termios->c_cflag & CSIZE) == CS5) {
> + termios->c_cflag &= ~CSIZE;
> + termios->c_cflag |= old_csize;
> + }
> + if (pru_softuart_setdatabits
> + (dev, &soft_uart->suart_hdl[port->line], cval, cval) != 0)
> + dev_err(dev, "failed to set data bits to: %d\n", cval);
> +
> +/*
> + * Ask the core to calculate the divisor for us.
> + */
> + baud = uart_get_baud_rate(port, termios, old,
> +   port->uartclk / 16 / 0xffff,
> +   port->uartclk / 16);
> +
> +/*
> + * Ok, we're now changing the port state.  Do it with
> + * interrupts disabled.
> + */
> + spin_lock_irqsave(&port->lock, flags);
> +
> + /* Set the baud */
> + if (pru_softuart_setbaud(dev, &soft_uart->suart_hdl[port->line],
> + SUART_DEFAULT_BAUD / baud,
> + SUART_DEFAULT_BAUD / baud) != 0)
> + dev_err(dev, "failed to set baud to: %d\n", baud);
> +
> +/*
> + * update port->read_config_mask and port->ignore_config_mask
> + * to indicate the events we are interested in receiving
> + */
> + suart_intr_setmask(dev, soft_uart->suart_hdl[port->line].uart_num,
> +    PRU_RX_INTR, SUART_GBL_INTR_ERR_MASK);
> + port->read_status_mask = 0;
> + if (termios->c_iflag & INPCK) { /* Input parity check not supported,
> + just enabled FE */
> + port->read_status_mask |= CHN_TXRX_STATUS_FE;
> + suart_intr_setmask(dev,
> + soft_uart->suart_hdl[port->line].uart_num,
> + PRU_RX_INTR, CHN_TXRX_IE_MASK_FE);
> + }
> + if (termios->c_iflag & (BRKINT | PARMRK)) {
> + port->read_status_mask |= CHN_TXRX_STATUS_BI;
> + suart_intr_setmask(dev,
> + soft_uart->suart_hdl[port->line].uart_num,
> + PRU_RX_INTR, CHN_TXRX_IE_MASK_BI);
> + }
> +/*
> + * Characters to ignore
> + */
> + port->ignore_status_mask = 0;
> + if (termios->c_iflag & IGNBRK) {
> + port->ignore_status_mask |= CHN_TXRX_STATUS_BI;
> + /*
> + * If we're ignoring break indicators,
> + * ignore overruns too (for real raw support).
> + */
> + if (termios->c_iflag & IGNPAR) {
> + port->ignore_status_mask |=
> +     (CHN_TXRX_STATUS_OVRNERR | CHN_TXRX_STATUS_FE);
> + /*
> + * Overrun in case of RX
> + * Underrun in case of TX
> + */
> + suart_intr_clrmask(dev, soft_uart->
> +    suart_hdl[port->line].uart_num,
> +    PRU_RX_INTR, CHN_TXRX_IE_MASK_FE);
> + }
> + suart_intr_clrmask(dev,
> + soft_uart->suart_hdl[port->line].uart_num,
> + PRU_RX_INTR, CHN_TXRX_IE_MASK_BI);
> + }
> +/*
> + * ignore all characters if CREAD is not set
> + */
> + if ((termios->c_cflag & CREAD) == 0) {
> + port->ignore_status_mask |= CHN_TXRX_STATUS_RDY;
> + pruss_suart_stop_rx(port);
> + }
> + /*
> + * update the per port timeout
> + */
> + uart_update_timeout(port, termios->c_cflag, baud);
> +
> + spin_unlock_irqrestore(&port->lock, flags);
> +
> + /* Don't rewrite B0 */
> + if (tty_termios_baud_rate(termios))
> + tty_termios_encode_baud_rate(termios, baud, baud);
> +}
> +
> +/*
> + * Grab any interrupt resources and initialise any low level driver
> + * state.  Enable the port for reception.  It should not activate
> + * RTS nor DTR; this will be done via a separate call to set_mctrl.
> + *
> + * This method will only be called when the port is initially opened.
> + *
> + * Locking: port_sem taken.
> + * Interrupts: globally disabled.
> + */
> +static s32 pruss_suart_startup(struct uart_port *port)
> +{
> + struct omapl_pru_suart *soft_uart =
> +     container_of(port, struct omapl_pru_suart, port[port->line]);
> + struct device *dev = soft_uart->dev;
> + unsigned long flags = 0;
> + s32 retval;
> +
> + /*
> + * Disable interrupts from this port
> + */
> + spin_lock_irqsave(&port->lock, flags);
> + suart_intr_clrmask(dev, soft_uart->suart_hdl[port->line].uart_num,
> +    PRU_TX_INTR, CHN_TXRX_IE_MASK_CMPLT);
> + suart_intr_clrmask(dev, soft_uart->suart_hdl[port->line].uart_num,
> +    PRU_RX_INTR, CHN_TXRX_IE_MASK_BI
> +    | CHN_TXRX_IE_MASK_FE | CHN_TXRX_IE_MASK_CMPLT
> +    | CHN_TXRX_IE_MASK_TIMEOUT);
> + spin_unlock_irqrestore(&port->lock, flags);
> +
> + retval = request_irq(port->irq, pruss_suart_interrupt,
> +      port->irqflags, "suart_irq", port);
> + if (retval) {
> + free_irq(port->irq, port); /* should we free this if err */
> + goto out;
> + }
> + /*
> + * enable interrupts from this port
> + */
> + spin_lock_irqsave(&port->lock, flags);
> + suart_intr_setmask(dev, soft_uart->suart_hdl[port->line].uart_num,
> +    PRU_RX_INTR, SUART_GBL_INTR_ERR_MASK);
> +
> + suart_intr_setmask(dev, soft_uart->suart_hdl[port->line].uart_num,
> +    PRU_RX_INTR, CHN_TXRX_IE_MASK_BI
> +    | CHN_TXRX_IE_MASK_FE | CHN_TXRX_IE_MASK_CMPLT
> +    | CHN_TXRX_IE_MASK_TIMEOUT);
> +
> + suart_intr_setmask(dev, soft_uart->suart_hdl[port->line].uart_num,
> +    PRU_TX_INTR, CHN_TXRX_IE_MASK_CMPLT);
> + spin_unlock_irqrestore(&port->lock, flags);
> +
> + if ((suart_get_duplex(soft_uart, port->line) & ePRU_SUART_HALF_TX)
> +     == ePRU_SUART_HALF_TX) {
> + suart_pru_to_host_intr_enable(dev, soft_uart->
> + suart_hdl[port->line].uart_num, PRU_TX_INTR, true);
> + }
> + /* Seed RX if port is half-rx or full-duplex */
> + if ((suart_get_duplex(soft_uart, port->line) & ePRU_SUART_HALF_RX)
> + == ePRU_SUART_HALF_RX) {
> + suart_pru_to_host_intr_enable(dev, soft_uart->
> + suart_hdl[port->line].uart_num, PRU_RX_INTR, true);
> + pru_softuart_read(dev, &soft_uart->suart_hdl[port->line],
> + (u32 *)&soft_uart->suart_fifo_addr[port->line].
> + fifo_phys_addr_rx, SUART_FIFO_LEN);
> + }
> +out:
> + return retval;
> +}
> +
> +/*
> + * Disable the port, disable any break condition that may be in
> + * effect, and free any interrupt resources.  It should not disable
> + * RTS nor DTR; this will have already been done via a separate
> + * call to set_mctrl.
> + *
> + * Drivers must not access port->info once this call has completed.
> + *
> + * This method will only be called when there are no more users of
> + * this port.
> + *
> + * Locking: port_sem taken.
> + * Interrupts: caller dependent.
> + */
> +
> +static void pruss_suart_shutdown(struct uart_port *port)
> +{
> + struct omapl_pru_suart *soft_uart =
> +     container_of(port, struct omapl_pru_suart, port[port->line]);
> + struct device *dev = soft_uart->dev;
> + unsigned long flags = 0;
> +
> + /*
> + * Disable interrupts from this port
> + */
> + /* Disable BI and FE intr */
> + spin_lock_irqsave(&port->lock, flags);
> + suart_intr_clrmask(dev, soft_uart->suart_hdl[port->line].uart_num,
> +    PRU_TX_INTR, CHN_TXRX_IE_MASK_CMPLT);
> + suart_intr_clrmask(dev, soft_uart->suart_hdl[port->line].uart_num,
> +    PRU_RX_INTR, CHN_TXRX_IE_MASK_BI
> +    | CHN_TXRX_IE_MASK_FE | CHN_TXRX_IE_MASK_CMPLT
> +    | CHN_TXRX_IE_MASK_TIMEOUT);
> + spin_unlock_irqrestore(&port->lock, flags);
> +
> + /* free interrupts */
> + free_irq(port->irq, port);
> +}
> +
> +/*
> + * Return a pointer to a string constant describing the specified
> + * port, or return NULL, in which case the string 'unknown' is
> + * substituted.
> + *
> + * Locking: none.
> + * Interrupts: caller dependent.
> + */
> +
> +static const char *pruss_suart_type(struct uart_port *port)
> +{
> + return "suart_tty";
> +}
> +
> +/*
> + * Release any memory and IO region resources currently in use by
> + * the port.
> + *
> + * Locking: none.
> + * Interrupts: caller dependent.
> + */
> +
> +static void pruss_suart_release_port(struct uart_port *port)
> +{
> + struct omapl_pru_suart *soft_uart =
> +     container_of(port, struct omapl_pru_suart, port[port->line]);
> + struct platform_device *pdev = to_platform_device(port->dev);
> +
> + if (0 != pru_softuart_close(&soft_uart->suart_hdl[port->line]))
> + dev_err(&pdev->dev, "failed to close suart\n");
> +
> + return;
> +}
> +
> +/*
> + * Request any memory and IO region resources required by the port.
> + * If any fail, no resources should be registered when this function
> + * returns, and it should return -EBUSY on failure.
> + *
> + * Locking: none.
> + * Interrupts: caller dependent.
> + *
> + * We need to d/l the f/w in probe and since this api
> + * is called per uart, the request_mem_region should
> + * be called in probe itself.
> + */
> +static s32 pruss_suart_request_port(struct uart_port *port)
> +{
> + struct omapl_pru_suart *soft_uart =
> +     container_of(port, struct omapl_pru_suart, port[port->line]);
> + struct platform_device *pdev = to_platform_device(port->dev);
> + struct device *dev = soft_uart->dev;
> + struct suart_config pru_suart_config;
> + s16 timeout = 0;
> + u32 err = 0;
> +
> + if (soft_uart == NULL) {
> + dev_err(&pdev->dev, "soft_uart ptr failed\n");
> + return -ENODEV;
> + }
> + err = pru_softuart_open(&soft_uart->suart_hdl[port->line]);
> + if (err != 0) {
> + dev_err(&pdev->dev, "failed to open suart: %d\n", err);
> + err = -ENODEV;
> + goto exit;
> + }
> + set_bit(0, &soft_uart->tx_empty[port->line]);
> +
> + /* set fifo /timeout */
> + if (SUART_FIFO_TIMEOUT_MIN > suart_timeout) {
> + dev_err(&pdev->dev, "fifo timeout less than %d ms not supported\n",
> +     SUART_FIFO_TIMEOUT_MIN);
> + suart_timeout = SUART_FIFO_TIMEOUT_MIN;
> + } else if (SUART_FIFO_TIMEOUT_MAX < suart_timeout) {
> + dev_err(&pdev->dev, "fifo timeout more than %d ms not supported\n",
> +     SUART_FIFO_TIMEOUT_MAX);
> + suart_timeout = SUART_FIFO_TIMEOUT_MAX;
> + }
> +
> + /* This is only for x8 */
> + timeout = (SUART_DEFAULT_BAUD * suart_timeout) / 1000;
> + pru_set_fifo_timeout(dev, timeout);
> +
> + if (soft_uart->suart_hdl[port->line].uart_num == PRU_SUART_UART1) {
> + pru_suart_config.tx_serializer = PRU_SUART0_CONFIG_TX_SER;
> + pru_suart_config.rx_serializer = PRU_SUART0_CONFIG_RX_SER;
> + } else if (soft_uart->suart_hdl[port->line].uart_num ==
> + PRU_SUART_UART2) {
> + pru_suart_config.tx_serializer = PRU_SUART1_CONFIG_TX_SER;
> + pru_suart_config.rx_serializer = PRU_SUART1_CONFIG_RX_SER;
> + } else if (soft_uart->suart_hdl[port->line].uart_num ==
> + PRU_SUART_UART3) {
> + pru_suart_config.tx_serializer = PRU_SUART2_CONFIG_TX_SER;
> + pru_suart_config.rx_serializer = PRU_SUART2_CONFIG_RX_SER;
> + } else if (soft_uart->suart_hdl[port->line].uart_num ==
> + PRU_SUART_UART4) {
> + pru_suart_config.tx_serializer = PRU_SUART3_CONFIG_TX_SER;
> + pru_suart_config.rx_serializer = PRU_SUART3_CONFIG_RX_SER;
> + } else if (soft_uart->suart_hdl[port->line].uart_num ==
> + PRU_SUART_UART5) {
> + pru_suart_config.tx_serializer = PRU_SUART4_CONFIG_TX_SER;
> + pru_suart_config.rx_serializer = PRU_SUART4_CONFIG_RX_SER;
> + } else if (soft_uart->suart_hdl[port->line].uart_num ==
> + PRU_SUART_UART6) {
> + pru_suart_config.tx_serializer = PRU_SUART5_CONFIG_TX_SER;
> + pru_suart_config.rx_serializer = PRU_SUART5_CONFIG_RX_SER;
> + } else if (soft_uart->suart_hdl[port->line].uart_num ==
> + PRU_SUART_UART7) {
> + pru_suart_config.tx_serializer = PRU_SUART6_CONFIG_TX_SER;
> + pru_suart_config.rx_serializer = PRU_SUART6_CONFIG_RX_SER;
> + } else if (soft_uart->suart_hdl[port->line].uart_num ==
> + PRU_SUART_UART8) {
> + pru_suart_config.tx_serializer = PRU_SUART7_CONFIG_TX_SER;
> + pru_suart_config.rx_serializer = PRU_SUART7_CONFIG_RX_SER;
> + } else {
> + return -ENOTSUPP;
> + }
> +
> + /* Some defaults to startup. reconfigured by terimos later */
> + pru_suart_config.tx_clk_divisor = 1;
> + pru_suart_config.rx_clk_divisor = 1;
> + pru_suart_config.tx_bits_per_char = ePRU_SUART_DATA_BITS8;
> + pru_suart_config.rx_bits_per_char = ePRU_SUART_DATA_BITS8;
> + pru_suart_config.oversampling = SUART_DEFAULT_OVRSMPL;
> +
> + if (pru_softuart_setconfig(dev, &soft_uart->suart_hdl[port->line],
> + &pru_suart_config) != 0) {
> + dev_err(&pdev->dev,
> + "pru_softuart_setconfig: failed to set config: %X\n",
> + err);
> + }
> +exit:
> + return err;
> +}
> +
> +/*
> + * Perform any autoconfiguration steps required for the port.  `flag`
> + * contains a bit mask of the required configuration.  UART_CONFIG_TYPE
> + * indicates that the port requires detection and identification.
> + * port->type should be set to the type found, or PORT_UNKNOWN if
> + * no port was detected.
> + *
> + * UART_CONFIG_IRQ indicates autoconfiguration of the interrupt signal,
> + * which should be probed using standard kernel autoprobing techniques.
> + * This is not necessary on platforms where ports have interrupts
> + * internally hard wired (eg, system on a chip implementations).
> + *
> + * Locking: none.
> + * Interrupts: caller dependent.
> + */
> +
> +static void pruss_suart_config_port(struct uart_port *port, s32 flags)
> +{
> + if (flags & UART_CONFIG_TYPE && pruss_suart_request_port(port) == 0)
> + port->type = PORT_DA8XX_PRU_SUART;
> +}
> +
> +/*
> + * Verify the new serial port information contained within serinfo is
> + * suitable for this port type.
> + *
> + * Locking: none.
> + * Interrupts: caller dependent.
> + */
> +static s32 pruss_suart_verify_port(struct uart_port *port,
> + struct serial_struct *ser)
> +{
> + struct omapl_pru_suart *soft_uart =
> +     container_of(port, struct omapl_pru_suart, port[port->line]);
> + s32 ret = 0;
> +
> + if (ser->type != PORT_UNKNOWN && ser->type != PORT_DA8XX_PRU_SUART)
> + ret = -EINVAL;
> + if (soft_uart->port[port->line].irq != ser->irq)
> + ret = -EINVAL;
> + if (ser->io_type != UPIO_MEM)
> + ret = -EINVAL;
> + if (soft_uart->port[port->line].uartclk / 16 != ser->baud_base)
> + ret = -EINVAL;
> + if ((void *)soft_uart->port[port->line].mapbase != ser->iomem_base)
> + ret = -EINVAL;
> + if (soft_uart->port[port->line].iobase != ser->port)
> + ret = -EINVAL;
> + return ret;
> +}
> +
> +static struct uart_ops pruss_suart_ops = {
> + .tx_empty = pruss_suart_tx_empty,
> + .set_mctrl = pruss_suart_set_mctrl,
> + .get_mctrl = pruss_suart_get_mctrl,
> + .stop_tx = pruss_suart_stop_tx,
> + .start_tx = pruss_suart_start_tx,
> + .stop_rx = pruss_suart_stop_rx,
> + .enable_ms = pruss_suart_enable_ms,
> + .break_ctl = pruss_suart_break_ctl,
> + .startup = pruss_suart_startup,
> + .shutdown = pruss_suart_shutdown,
> + .set_termios = pruss_suart_set_termios,
> + .type = pruss_suart_type,
> + .release_port = pruss_suart_release_port,
> + .request_port = pruss_suart_request_port,
> + .config_port = pruss_suart_config_port,
> + .verify_port = pruss_suart_verify_port,
> +};
> +
> +static struct uart_driver pruss_suart_reg = {
> + .owner = THIS_MODULE,
> + .driver_name = DRV_NAME,
> + .dev_name = "ttySU",
> + .major = 0,
> + .minor = 16,
> + .nr = NR_SUART,
> +};
> +
> +static struct pruss_suart_initparams init_params = {
> + .tx_baud_value = SUART_DEFAULT_BAUD,
> + .rx_baud_value = SUART_DEFAULT_BAUD,
> + .oversampling = SUART_DEFAULT_OVRSMPL,
> +};
> +
> +static s32 __devinit pruss_suart_probe(struct platform_device *pdev)
> +{
> + struct omapl_pru_suart *soft_uart;
> + const struct da850_evm_pruss_suart_data *pdata;
> + struct device *dev = &pdev->dev;
> + struct resource *res;
> + struct clk *clk_pruss = NULL;
> + const struct firmware *fw;
> + s32 err, i;
> +
> + pdata = dev->platform_data;
> + if (!pdata) {
> + dev_err(&pdev->dev, "platform data not found\n");
> + return -EINVAL;
> + }
> + (pdata->setup)();
> +
> + soft_uart = kzalloc(sizeof(struct omapl_pru_suart), GFP_KERNEL);
> + if (!soft_uart)
> + return -ENOMEM;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!res) {
> + dev_err(&pdev->dev, "failed to get resource");
> + return -ENOMEM;
> + }
> +
> + if (!request_mem_region(res->start,
> + resource_size(res),
> + dev_name(&pdev->dev))) {
> + dev_err(&pdev->dev, "mcasp memory region already claimed!\n");
> + err = -EBUSY;
> + goto probe_exit;
> + }
> +
> + soft_uart->suart_iomap.mcasp_io_addr = ioremap(res->start,
> + resource_size(res));
> + if (!soft_uart->suart_iomap.mcasp_io_addr) {
> + dev_err(&pdev->dev, "mcasp ioremap failed\n");
> + err = -EFAULT;
> + goto probe_exit_1;
> + }
> +
> + soft_uart->suart_iomap.p_fifo_buff_virt_base =
> + sram_alloc(SUART_CNTX_SZ * NR_SUART * 2,
> + (dma_addr_t *) &soft_uart->suart_iomap.p_fifo_buff_phys_base);
> + if (!soft_uart->suart_iomap.p_fifo_buff_virt_base)
> + goto probe_exit_iounmap;
> +
> + clk_pruss = clk_get(NULL, "pruss");
> + if (IS_ERR(clk_pruss)) {
> + dev_err(&pdev->dev, "no clock available: pruss\n");
> + err = -ENODEV;
> + goto probe_exit_iounmap;
> + }
> + soft_uart->clk_freq_pru = clk_get_rate(clk_pruss);
> + clk_put(clk_pruss);
> +
> + soft_uart->clk_mcasp = clk_get(&pdev->dev, NULL);
> + if (IS_ERR(soft_uart->clk_mcasp)) {
> + dev_err(&pdev->dev, "no clock available: mcasp\n");
> + err = -ENODEV;
> + soft_uart->clk_mcasp = NULL;
> + goto probe_exit_sram_free;
> + }
> +
> + soft_uart->clk_freq_mcasp = clk_get_rate(soft_uart->clk_mcasp);
> + clk_enable(soft_uart->clk_mcasp);
> +
> + err = request_firmware(&fw, "PRU_SUART_Emulation.bin",
> +        &pdev->dev);
> + if (err) {
> + dev_err(&pdev->dev, "can't load firmware\n");
> + err = -ENODEV;
> + goto probe_exit_clk;
> + }
> + dev_info(&pdev->dev, "fw size %td. downloading...\n", fw->size);
> +
> + /* download firmware into pru  & init */
> + err = pru_softuart_init(dev, &init_params, fw->data, fw->size,
> + soft_uart->clk_freq_pru / 1000000,
> + &soft_uart->suart_iomap);
> + if (err) {
> + dev_err(&pdev->dev, "pruss init error\n");
> + err = -ENODEV;
> + goto probe_release_fw;
> + }
> + release_firmware(fw);
> +
> + platform_set_drvdata(pdev, &soft_uart->port[0]);
> + soft_uart->dev = dev;
> +
> + for (i = 0; i < NR_SUART; i++) {
> + soft_uart->port[i].ops = &pruss_suart_ops;
> + soft_uart->port[i].iotype = UPIO_MEM;
> + soft_uart->port[i].flags = UPF_BOOT_AUTOCONF | UPF_IOREMAP;
> + soft_uart->port[i].mapbase =
> + (u32)soft_uart->suart_iomap.p_fifo_buff_virt_base;
> + soft_uart->port[i].membase =
> + soft_uart->suart_iomap.mcasp_io_addr;
> + soft_uart->port[i].type = PORT_DA8XX_PRU_SUART;
> + soft_uart->port[i].irq =
> + platform_get_irq(to_platform_device(dev->parent), i);
> + soft_uart->port[i].dev = &pdev->dev;
> + soft_uart->port[i].irqflags = IRQF_SHARED;
> + soft_uart->port[i].uartclk = soft_uart->clk_freq_mcasp;
> + soft_uart->port[i].fifosize = SUART_FIFO_LEN;
> + soft_uart->tx_loadsz = SUART_FIFO_LEN;
> + soft_uart->port[i].custom_divisor = 1;
> + soft_uart->port[i].line = i;
> + soft_uart->suart_hdl[i].uart_num = i + 1;
> + soft_uart->port[i].serial_in = NULL;
> +
> + soft_uart->suart_fifo_addr[i].fifo_vaddr_buff_tx =
> + soft_uart->suart_iomap.p_fifo_buff_virt_base +
> + (2 * SUART_CNTX_SZ * i);
> +
> + soft_uart->suart_fifo_addr[i].fifo_vaddr_buff_rx =
> + soft_uart->suart_iomap.p_fifo_buff_virt_base +
> + ((2 * SUART_CNTX_SZ * i) + SUART_CNTX_SZ);
> +
> + soft_uart->suart_fifo_addr[i].fifo_phys_addr_tx =
> + soft_uart->suart_iomap.p_fifo_buff_phys_base +
> + (2 * SUART_CNTX_SZ * i);
> +
> + soft_uart->suart_fifo_addr[i].fifo_phys_addr_rx =
> + soft_uart->suart_iomap.p_fifo_buff_phys_base +
> + ((2 * SUART_CNTX_SZ * i) + SUART_CNTX_SZ);
> +
> + soft_uart->port[i].serial_out = NULL;
> + tasklet_init(&soft_uart->tx_task[i], suart_tx_task,
> + (unsigned long)&soft_uart->port[i]);
> + uart_add_one_port(&pruss_suart_reg, &soft_uart->port[i]);
> + }
> +
> + dev_info(&pdev->dev,
> + "%s device registered (pru_clk=%d, asp_clk=%d)\n",
> + DRV_NAME, soft_uart->clk_freq_pru, soft_uart->clk_freq_mcasp);
> +
> + return 0;
> +
> +probe_release_fw:
> + release_firmware(fw);
> +probe_exit_clk:
> + clk_put(soft_uart->clk_mcasp);
> + clk_disable(soft_uart->clk_mcasp);
> +probe_exit_sram_free:
> + sram_free(soft_uart->suart_iomap.p_fifo_buff_virt_base,
> + SUART_CNTX_SZ * NR_SUART * 2);
> +probe_exit_iounmap:
> + iounmap(soft_uart->suart_iomap.mcasp_io_addr);
> +probe_exit_1:
> + release_mem_region(res->start,
> + resource_size(res));
> +probe_exit:
> + kfree(soft_uart);
> + return err;
> +}
> +
> +static s32 __devexit pruss_suart_remove(struct platform_device *pdev)
> +{
> + struct omapl_pru_suart *soft_uart = platform_get_drvdata(pdev);
> + const struct da850_evm_pruss_suart_data *pdata;
> + struct device *dev = &pdev->dev;
> + struct resource *res;
> + int i;
> +
> + pdata = dev->platform_data;
> + if (!pdata)
> + dev_err(&pdev->dev, "platform data not found\n");
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + if (!res) {
> + dev_err(&pdev->dev, "failed to get resource");
> + return -ENOMEM;
> + }
> +
> + platform_set_drvdata(pdev, NULL);
> +
> + if (soft_uart) {
> + for (i = 0; i < NR_SUART; i++) {
> + uart_remove_one_port(&pruss_suart_reg,
> + &soft_uart->port[i]);
> + }
> + }
> +
> + sram_free(soft_uart->suart_iomap.p_fifo_buff_virt_base,
> + SUART_CNTX_SZ * NR_SUART * 2);
> + clk_put(soft_uart->clk_mcasp);
> + pru_mcasp_deinit();
> + clk_disable(soft_uart->clk_mcasp);
> + iounmap(soft_uart->suart_iomap.mcasp_io_addr);
> + if (pdata) {
> + release_mem_region(res->start,
> + resource_size(res));
> + }
> + kfree(soft_uart);
> + return 0;
> +}
> +
> +#define pruss_suart_suspend NULL
> +#define pruss_suart_resume NULL
> +
> +static struct platform_driver serial_pruss_driver = {
> + .probe = pruss_suart_probe,
> + .remove = __devexit_p(pruss_suart_remove),
> + .suspend = pruss_suart_suspend,
> + .resume = pruss_suart_resume,
> + .driver = {
> + .name = DRV_NAME,
> + .owner = THIS_MODULE,
> + },
> +};
> +
> +static s32 __init pruss_suart_init(void)
> +{
> + s32 ret;
> +
> + pruss_suart_reg.nr = NR_SUART;
> + ret = uart_register_driver(&pruss_suart_reg);
> + if (ret)
> + return ret;
> + ret = platform_driver_register(&serial_pruss_driver);
> + if (ret)
> + goto out;
> +
> + pr_debug("SUART serial driver loaded\n");
> + return ret;
> +out:
> + uart_unregister_driver(&pruss_suart_reg);
> + return ret;
> +}
> +
> +module_init(pruss_suart_init);
> +
> +static void __exit pruss_suart_exit(void)
> +{
> + platform_driver_unregister(&serial_pruss_driver);
> + uart_unregister_driver(&pruss_suart_reg);
> + pr_debug("SUART serial driver unloaded\n");
> +}
> +
> +module_exit(pruss_suart_exit);
> +
> +/* Module information */
> +MODULE_AUTHOR("Subhasish Ghosh <subhasish@mistralsolutions.com>");
> +MODULE_LICENSE("GPL");
> +MODULE_DESCRIPTION(DRV_DESC);
> diff --git a/drivers/tty/serial/pruss_suart.h 
> b/drivers/tty/serial/pruss_suart.h
> new file mode 100644
> index 0000000..f3a2a9d
> --- /dev/null
> +++ b/drivers/tty/serial/pruss_suart.h
> @@ -0,0 +1,1038 @@
> +/*
> + * Copyright (C) 2010, 2011 Texas Instruments Incorporated
> + * Author: Jitendra Kumar <jitendra@mistralsolutions.com>
> + *
> + * This program is free software; you can redistribute it and/or modify 
> it
> + * under the terms of the GNU General Public License as  published by the
> + * Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
> + * whether express or implied; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * General Public License for more details.
> + */
> +
> +#ifndef _SUART_API_H_
> +#define _SUART_API_H_
> +
> +#include <linux/types.h>
> +#include <linux/bitops.h>
> +#include <linux/io.h>
> +#include <linux/mfd/pruss.h>
> +
> +#define SINGLE_PRU 0
> +#define BOTH_PRU 1
> +#define PRU_ACTIVE BOTH_PRU
> +#define PRU_CLK_228 228
> +#define PRU_CLK_186 186
> +
> +#define PRU_SUART_SERIALIZER_0 (0u)
> +#define PRU_SUART_SERIALIZER_1 (1u)
> +#define PRU_SUART_SERIALIZER_2 (2u)
> +#define PRU_SUART_SERIALIZER_3 (3u)
> +#define PRU_SUART_SERIALIZER_4 (4u)
> +#define PRU_SUART_SERIALIZER_5 (5u)
> +#define PRU_SUART_SERIALIZER_6 (6u)
> +#define PRU_SUART_SERIALIZER_7 (7u)
> +#define PRU_SUART_SERIALIZER_8 (8u)
> +#define PRU_SUART_SERIALIZER_9 (9u)
> +#define PRU_SUART_SERIALIZER_10 (10u)
> +#define PRU_SUART_SERIALIZER_11 (11u)
> +#define PRU_SUART_SERIALIZER_12 (12u)
> +#define PRU_SUART_SERIALIZER_13 (13u)
> +#define PRU_SUART_SERIALIZER_14 (14u)
> +#define PRU_SUART_SERIALIZER_15 (15u)
> +#define PRU_SUART_SERIALIZER_NONE (16u)
> +
> +#define PRU_SUART_UART1 (1u)
> +#define PRU_SUART_UART2 (2u)
> +#define PRU_SUART_UART3 (3u)
> +#define PRU_SUART_UART4 (4u)
> +#define PRU_SUART_UART5 (5u)
> +#define PRU_SUART_UART6 (6u)
> +#define PRU_SUART_UART7 (7u)
> +#define PRU_SUART_UART8 (8u)
> +#define PRU_SUART_UARTx_INVALID (9u)
> +
> +#define PRU_SUART_HALF_TX (1u)
> +#define PRU_SUART_HALF_RX (2u)
> +#define PRU_SUART_HALF_TX_DISABLED (4u)
> +#define PRU_SUART_HALF_RX_DISABLED (8u)
> +
> +#define PRU_SUART0_CONFIG_DUPLEX (PRU_SUART_HALF_TX_DISABLED | \
> + PRU_SUART_HALF_RX_DISABLED)
> +#define PRU_SUART0_CONFIG_RX_SER (PRU_SUART_SERIALIZER_NONE)
> +#define PRU_SUART0_CONFIG_TX_SER (PRU_SUART_SERIALIZER_NONE)
> +
> +#define PRU_SUART1_CONFIG_DUPLEX (PRU_SUART_HALF_TX | \
> + PRU_SUART_HALF_RX)
> +#define PRU_SUART1_CONFIG_RX_SER (PRU_SUART_SERIALIZER_7)
> +#define PRU_SUART1_CONFIG_TX_SER (PRU_SUART_SERIALIZER_8)
> +
> +#define PRU_SUART2_CONFIG_DUPLEX (PRU_SUART_HALF_TX | \
> + PRU_SUART_HALF_RX)
> +#define PRU_SUART2_CONFIG_RX_SER (PRU_SUART_SERIALIZER_9)
> +#define PRU_SUART2_CONFIG_TX_SER (PRU_SUART_SERIALIZER_10)
> +
> +#define PRU_SUART3_CONFIG_DUPLEX (PRU_SUART_HALF_TX | \
> + PRU_SUART_HALF_RX)
> +#define PRU_SUART3_CONFIG_RX_SER (PRU_SUART_SERIALIZER_13)
> +#define PRU_SUART3_CONFIG_TX_SER (PRU_SUART_SERIALIZER_14)
> +
> +#define PRU_SUART4_CONFIG_DUPLEX (PRU_SUART_HALF_TX_DISABLED | \
> + PRU_SUART_HALF_RX_DISABLED)
> +#define PRU_SUART4_CONFIG_RX_SER (PRU_SUART_SERIALIZER_NONE)
> +#define PRU_SUART4_CONFIG_TX_SER (PRU_SUART_SERIALIZER_NONE)
> +
> +#define PRU_SUART5_CONFIG_DUPLEX (PRU_SUART_HALF_TX_DISABLED | \
> + PRU_SUART_HALF_RX_DISABLED)
> +#define PRU_SUART5_CONFIG_RX_SER (PRU_SUART_SERIALIZER_NONE)
> +#define PRU_SUART5_CONFIG_TX_SER (PRU_SUART_SERIALIZER_NONE)
> +
> +#define PRU_SUART6_CONFIG_DUPLEX (PRU_SUART_HALF_TX_DISABLED | \
> + PRU_SUART_HALF_RX_DISABLED)
> +#define PRU_SUART6_CONFIG_RX_SER (PRU_SUART_SERIALIZER_NONE)
> +#define PRU_SUART6_CONFIG_TX_SER (PRU_SUART_SERIALIZER_NONE)
> +
> +#define PRU_SUART7_CONFIG_DUPLEX (PRU_SUART_HALF_TX_DISABLED | \
> + PRU_SUART_HALF_RX_DISABLED)
> +#define PRU_SUART7_CONFIG_RX_SER (PRU_SUART_SERIALIZER_NONE)
> +#define PRU_SUART7_CONFIG_TX_SER (PRU_SUART_SERIALIZER_NONE)
> +
> +#define SUART_NUM_OF_CHANNELS_PER_SUART 2
> +#define SUART_NUM_OF_BYTES_PER_CHANNEL 16
> +
> +#define PRU_TX_INTR 1
> +#define PRU_RX_INTR 2
> +
> +#define CHN_TXRX_STATUS_TIMEOUT BIT(6)
> +#define CHN_TXRX_STATUS_BI BIT(5)
> +#define CHN_TXRX_STATUS_FE BIT(4)
> +#define CHN_TXRX_STATUS_UNERR BIT(3)
> +#define CHN_TXRX_STATUS_OVRNERR BIT(3)
> +#define CHN_TXRX_STATUS_ERR BIT(2)
> +#define CHN_TXRX_STATUS_CMPLT BIT(1)
> +#define CHN_TXRX_STATUS_RDY BIT(0)
> +
> +#define CHN_TXRX_IE_MASK_TIMEOUT BIT(14)
> +#define CHN_TXRX_IE_MASK_BI BIT(13)
> +#define CHN_TXRX_IE_MASK_FE BIT(12)
> +#define CHN_TXRX_IE_MASK_CMPLT BIT(1)
> +
> +#define SUART_GBL_INTR_ERR_MASK BIT(9)
> +#define SUART_PRU_ID_MASK 0xFF
> +
> +#define SUART_FIFO_LEN 15
> +#define SUART_8X_OVRSMPL 1
> +#define SUART_16X_OVRSMPL 2
> +#define SUART_TX_OVRSMPL 0
> +#define SUART_DEFAULT_OVRSMPL SUART_8X_OVRSMPL
> +
> +#define SUART_DEFAULT_OVRSMPL_OFFSET 26
> +#define SUART_CHN_OFFSET 31
> +#define SERIALIZER_OFFSET 8
> +
> +#if (SUART_DEFAULT_OVRSMPL == SUART_16X_OVRSMPL)
> +#define SUART_DEFAULT_BAUD 57600
> +#else
> +#define SUART_DEFAULT_BAUD 115200
> +#endif
> +
> +#define PRU_MODE_INVALID 0x0
> +#define PRU_MODE_TX_ONLY 0x1
> +#define PRU_MODE_RX_ONLY 0x2
> +#define PRU_MODE_RX_TX_BOTH 0x3
> +
> +#if (PRU_ACTIVE == BOTH_PRU)
> +#define PRU0_MODE PRU_MODE_RX_ONLY
> +#define PRU1_MODE PRU_MODE_TX_ONLY
> +#elif (PRU_ACTIVE ==  SINGLE_PRU)
> +#define PRU0_MODE PRU_MODE_RX_TX_BOTH
> +#define PRU1_MODE PRU_MODE_INVALID
> +#else
> +#define PRU0_MODE PRU_MODE_INVALID
> +#define PRU1_MODE PRU_MODE_INVALID
> +#endif
> +
> +#define MCASP_XBUF_BASE_ADDR (0x01d00200)
> +#define MCASP_RBUF_BASE_ADDR (0x01d00280)
> +#define MCASP_SRCTL_BASE_ADDR (0x01d00180)
> +
> +#define MCASP_SRCTL_TX_MODE (0x000D)
> +#define MCASP_SRCTL_RX_MODE (0x000E)
> +
> +/* Since only PRU0 can work as RX */
> +#define RX_DEFAULT_DATA_DUMP_ADDR (0x00001FC)
> +#define PRU_NUM_OF_CHANNELS (16)
> +
> +/* MCASP */
> +
> +#define OMAPL_MCASP_PFUNC_AFSR_MASK (0x80000000u)
> +#define OMAPL_MCASP_PFUNC_AFSR_SHIFT (0x0000001Fu)
> +#define OMAPL_MCASP_PFUNC_AFSR_RESETVAL (0x00000000u)
> +/* AFSR Tokens */
> +#define OMAPL_MCASP_PFUNC_AFSR_MCASP (0x00000000u)
> +#define OMAPL_MCASP_PFUNC_AFSR_GPIO (0x00000001u)
> +
> +#define OMAPL_MCASP_PFUNC_AHCLKR_MASK (0x40000000u)
> +#define OMAPL_MCASP_PFUNC_AHCLKR_SHIFT (0x0000001Eu)
> +#define OMAPL_MCASP_PFUNC_AHCLKR_RESETVAL (0x00000000u)
> +/* AHCLKR Tokens */
> +#define OMAPL_MCASP_PFUNC_AHCLKR_MCASP (0x00000000u)
> +#define OMAPL_MCASP_PFUNC_AHCLKR_GPIO (0x00000001u)
> +
> +#define OMAPL_MCASP_PFUNC_ACLKR_MASK (0x20000000u)
> +#define OMAPL_MCASP_PFUNC_ACLKR_SHIFT (0x0000001Du)
> +#define OMAPL_MCASP_PFUNC_ACLKR_RESETVAL (0x00000000u)
> +/* ACLKR Tokens */
> +#define OMAPL_MCASP_PFUNC_ACLKR_MCASP (0x00000000u)
> +#define OMAPL_MCASP_PFUNC_ACLKR_GPIO (0x00000001u)
> +
> +#define OMAPL_MCASP_PFUNC_AFSX_MASK (0x10000000u)
> +#define OMAPL_MCASP_PFUNC_AFSX_SHIFT (0x0000001Cu)
> +#define OMAPL_MCASP_PFUNC_AFSX_RESETVAL (0x00000000u)
> +/* AFSX Tokens */
> +#define OMAPL_MCASP_PFUNC_AFSX_MCASP (0x00000000u)
> +#define OMAPL_MCASP_PFUNC_AFSX_GPIO (0x00000001u)
> +
> +#define OMAPL_MCASP_PFUNC_AHCLKX_MASK (0x08000000u)
> +#define OMAPL_MCASP_PFUNC_AHCLKX_SHIFT (0x0000001Bu)
> +#define OMAPL_MCASP_PFUNC_AHCLKX_RESETVAL (0x00000000u)
> +/* AHCLKX Tokens */
> +#define OMAPL_MCASP_PFUNC_AHCLKX_MCASP (0x00000000u)
> +#define OMAPL_MCASP_PFUNC_AHCLKX_GPIO (0x00000001u)
> +
> +#define OMAPL_MCASP_PFUNC_ACLKX_MASK (0x04000000u)
> +#define OMAPL_MCASP_PFUNC_ACLKX_SHIFT (0x0000001Au)
> +#define OMAPL_MCASP_PFUNC_ACLKX_RESETVAL (0x00000000u)
> +/* ACLKX Tokens */
> +#define OMAPL_MCASP_PFUNC_ACLKX_MCASP (0x00000000u)
> +#define OMAPL_MCASP_PFUNC_ACLKX_GPIO (0x00000001u)
> +
> +#define OMAPL_MCASP_PFUNC_AMUTE_MASK (0x02000000u)
> +#define OMAPL_MCASP_PFUNC_AMUTE_SHIFT (0x00000019u)
> +#define OMAPL_MCASP_PFUNC_AMUTE_RESETVAL (0x00000000u)
> +/* AMUTE Tokens */
> +#define OMAPL_MCASP_PFUNC_AMUTE_MCASP (0x00000000u)
> +#define OMAPL_MCASP_PFUNC_AMUTE_GPIO (0x00000001u)
> +
> +#define OMAPL_MCASP_PFUNC_AXR15_MASK (0x00008000u)
> +#define OMAPL_MCASP_PFUNC_AXR15_SHIFT (0x0000000Fu)
> +#define OMAPL_MCASP_PFUNC_AXR15_RESETVAL (0x00000000u)
> +#define OMAPL_MCASP_PFUNC_AXR15_MCASP (0x00000000u)
> +#define OMAPL_MCASP_PFUNC_AXR15_GPIO (0x00000001u)
> +
> +#define OMAPL_MCASP_PFUNC_AXR14_MASK (0x00004000u)
> +#define OMAPL_MCASP_PFUNC_AXR14_SHIFT (0x0000000Eu)
> +#define OMAPL_MCASP_PFUNC_AXR14_RESETVAL (0x00000000u)
> +#define OMAPL_MCASP_PFUNC_AXR14_MCASP (0x00000000u)
> +#define OMAPL_MCASP_PFUNC_AXR14_GPIO (0x00000001u)
> +
> +#define OMAPL_MCASP_PFUNC_AXR13_MASK (0x00002000u)
> +#define OMAPL_MCASP_PFUNC_AXR13_SHIFT (0x0000000Du)
> +#define OMAPL_MCASP_PFUNC_AXR13_RESETVAL (0x00000000u)
> +#define OMAPL_MCASP_PFUNC_AXR13_MCASP (0x00000000u)
> +#define OMAPL_MCASP_PFUNC_AXR13_GPIO (0x00000001u)
> +
> +#define OMAPL_MCASP_PFUNC_AXR12_MASK (0x00001000u)
> +#define OMAPL_MCASP_PFUNC_AXR12_SHIFT (0x0000000Cu)
> +#define OMAPL_MCASP_PFUNC_AXR12_RESETVAL (0x00000000u)
> +#define OMAPL_MCASP_PFUNC_AXR12_MCASP (0x00000000u)
> +#define OMAPL_MCASP_PFUNC_AXR12_GPIO (0x00000001u)
> +
> +#define OMAPL_MCASP_PFUNC_AXR11_MASK (0x00000800u)
> +#define OMAPL_MCASP_PFUNC_AXR11_SHIFT (0x0000000Bu)
> +#define OMAPL_MCASP_PFUNC_AXR11_RESETVAL (0x00000000u)
> +#define OMAPL_MCASP_PFUNC_AXR11_MCASP (0x00000000u)
> +#define OMAPL_MCASP_PFUNC_AXR11_GPIO (0x00000001u)
> +
> +#define OMAPL_MCASP_PFUNC_AXR10_MASK (0x00000400u)
> +#define OMAPL_MCASP_PFUNC_AXR10_SHIFT (0x0000000Au)
> +#define OMAPL_MCASP_PFUNC_AXR10_RESETVAL (0x00000000u)
> +#define OMAPL_MCASP_PFUNC_AXR10_MCASP (0x00000000u)
> +#define OMAPL_MCASP_PFUNC_AXR10_GPIO (0x00000001u)
> +#define OMAPL_MCASP_PFUNC_AXR9_MASK (0x00000200u)
> +#define OMAPL_MCASP_PFUNC_AXR9_SHIFT (0x00000009u)
> +#define OMAPL_MCASP_PFUNC_AXR9_RESETVAL (0x00000000u)
> +/* AXR9 Token */
> +#define OMAPL_MCASP_PFUNC_AXR9_MCASP (0x00000000u)
> +#define OMAPL_MCASP_PFUNC_AXR9_GPIO (0x00000001u)
> +
> +#define OMAPL_MCASP_PFUNC_AXR8_MASK (0x00000100u)
> +#define OMAPL_MCASP_PFUNC_AXR8_SHIFT (0x00000008u)
> +#define OMAPL_MCASP_PFUNC_AXR8_RESETVAL (0x00000000u)
> +/* AXR8 Tokens */
> +#define OMAPL_MCASP_PFUNC_AXR8_MCASP (0x00000000u)
> +#define OMAPL_MCASP_PFUNC_AXR8_GPIO (0x00000001u)
> +
> +#define OMAPL_MCASP_PFUNC_AXR7_MASK (0x00000080u)
> +#define OMAPL_MCASP_PFUNC_AXR7_SHIFT (0x00000007u)
> +#define OMAPL_MCASP_PFUNC_AXR7_RESETVAL (0x00000000u)
> +/* AXR7 Tokens */
> +#define OMAPL_MCASP_PFUNC_AXR7_MCASP (0x00000000u)
> +#define OMAPL_MCASP_PFUNC_AXR7_GPIO (0x00000001u)
> +
> +#define OMAPL_MCASP_PFUNC_AXR6_MASK (0x00000040u)
> +#define OMAPL_MCASP_PFUNC_AXR6_SHIFT (0x00000006u)
> +#define OMAPL_MCASP_PFUNC_AXR6_RESETVAL (0x00000000u)
> +/* AXR6 Tokens */
> +#define OMAPL_MCASP_PFUNC_AXR6_MCASP (0x00000000u)
> +#define OMAPL_MCASP_PFUNC_AXR6_GPIO (0x00000001u)
> +
> +#define OMAPL_MCASP_PFUNC_AXR5_MASK (0x00000020u)
> +#define OMAPL_MCASP_PFUNC_AXR5_SHIFT (0x00000005u)
> +#define OMAPL_MCASP_PFUNC_AXR5_RESETVAL (0x00000000u)
> +/* AXR5 Tokens */
> +#define OMAPL_MCASP_PFUNC_AXR5_MCASP (0x00000000u)
> +#define OMAPL_MCASP_PFUNC_AXR5_GPIO (0x00000001u)
> +
> +#define OMAPL_MCASP_PFUNC_AXR4_MASK (0x00000010u)
> +#define OMAPL_MCASP_PFUNC_AXR4_SHIFT (0x00000004u)
> +#define OMAPL_MCASP_PFUNC_AXR4_RESETVAL (0x00000000u)
> +/* AXR4 Tokens */
> +#define OMAPL_MCASP_PFUNC_AXR4_MCASP (0x00000000u)
> +#define OMAPL_MCASP_PFUNC_AXR4_GPIO (0x00000001u)
> +
> +#define OMAPL_MCASP_PFUNC_AXR3_MASK (0x00000008u)
> +#define OMAPL_MCASP_PFUNC_AXR3_SHIFT (0x00000003u)
> +#define OMAPL_MCASP_PFUNC_AXR3_RESETVAL (0x00000000u)
> +/* AXR3 Tokens */
> +#define OMAPL_MCASP_PFUNC_AXR3_MCASP (0x00000000u)
> +#define OMAPL_MCASP_PFUNC_AXR3_GPIO (0x00000001u)
> +
> +#define OMAPL_MCASP_PFUNC_AXR2_MASK (0x00000004u)
> +#define OMAPL_MCASP_PFUNC_AXR2_SHIFT (0x00000002u)
> +#define OMAPL_MCASP_PFUNC_AXR2_RESETVAL (0x00000000u)
> +/* AXR2 Tokens */
> +#define OMAPL_MCASP_PFUNC_AXR2_MCASP (0x00000000u)
> +#define OMAPL_MCASP_PFUNC_AXR2_GPIO (0x00000001u)
> +
> +#define OMAPL_MCASP_PFUNC_AXR1_MASK (0x00000002u)
> +#define OMAPL_MCASP_PFUNC_AXR1_SHIFT (0x00000001u)
> +#define OMAPL_MCASP_PFUNC_AXR1_RESETVAL (0x00000000u)
> +/* AXR1 Tokens */
> +#define OMAPL_MCASP_PFUNC_AXR1_MCASP (0x00000000u)
> +#define OMAPL_MCASP_PFUNC_AXR1_GPIO (0x00000001u)
> +
> +#define OMAPL_MCASP_PFUNC_AXR0_MASK (0x00000001u)
> +#define OMAPL_MCASP_PFUNC_AXR0_SHIFT (0x00000000u)
> +#define OMAPL_MCASP_PFUNC_AXR0_RESETVAL (0x00000000u)
> +/* AXR0 Tokens */
> +#define OMAPL_MCASP_PFUNC_AXR0_MCASP (0x00000000u)
> +#define OMAPL_MCASP_PFUNC_AXR0_GPIO (0x00000001u)
> +#define OMAPL_MCASP_PFUNC_RESETVAL (0x00000000u)
> +
> +#define OMAPL_MCASP_PDIR_AFSR_MASK (0x80000000u)
> +#define OMAPL_MCASP_PDIR_AFSR_SHIFT (0x0000001Fu)
> +#define OMAPL_MCASP_PDIR_AFSR_RESETVAL (0x00000000u)
> +/* AFSR Tokens */
> +#define OMAPL_MCASP_PDIR_AFSR_INPUT (0x00000000u)
> +#define OMAPL_MCASP_PDIR_AFSR_OUTPUT (0x00000001u)
> +
> +#define OMAPL_MCASP_PDIR_AHCLKR_MASK (0x40000000u)
> +#define OMAPL_MCASP_PDIR_AHCLKR_SHIFT (0x0000001Eu)
> +#define OMAPL_MCASP_PDIR_AHCLKR_RESETVAL (0x00000000u)
> +/* AHCLKR Tokens */
> +#define OMAPL_MCASP_PDIR_AHCLKR_INPUT (0x00000000u)
> +#define OMAPL_MCASP_PDIR_AHCLKR_OUTPUT (0x00000001u)
> +
> +#define OMAPL_MCASP_PDIR_ACLKR_MASK (0x20000000u)
> +#define OMAPL_MCASP_PDIR_ACLKR_SHIFT (0x0000001Du)
> +#define OMAPL_MCASP_PDIR_ACLKR_RESETVAL (0x00000000u)
> +/* ACLKR Tokens */
> +#define OMAPL_MCASP_PDIR_ACLKR_INPUT (0x00000000u)
> +#define OMAPL_MCASP_PDIR_ACLKR_OUTPUT (0x00000001u)
> +
> +#define OMAPL_MCASP_PDIR_AFSX_MASK (0x10000000u)
> +#define OMAPL_MCASP_PDIR_AFSX_SHIFT (0x0000001Cu)
> +#define OMAPL_MCASP_PDIR_AFSX_RESETVAL (0x00000000u)
> +/* AFSX Tokens */
> +#define OMAPL_MCASP_PDIR_AFSX_INPUT (0x00000000u)
> +#define OMAPL_MCASP_PDIR_AFSX_OUTPUT (0x00000001u)
> +
> +#define OMAPL_MCASP_PDIR_AHCLKX_MASK (0x08000000u)
> +#define OMAPL_MCASP_PDIR_AHCLKX_SHIFT (0x0000001Bu)
> +#define OMAPL_MCASP_PDIR_AHCLKX_RESETVAL (0x00000000u)
> +/* AHCLKX Tokens */
> +#define OMAPL_MCASP_PDIR_AHCLKX_INPUT (0x00000000u)
> +#define OMAPL_MCASP_PDIR_AHCLKX_OUTPUT (0x00000001u)
> +
> +#define OMAPL_MCASP_PDIR_ACLKX_MASK (0x04000000u)
> +#define OMAPL_MCASP_PDIR_ACLKX_SHIFT (0x0000001Au)
> +#define OMAPL_MCASP_PDIR_ACLKX_RESETVAL (0x00000000u)
> +/* ACLKX Tokens */
> +#define OMAPL_MCASP_PDIR_ACLKX_INPUT (0x00000000u)
> +#define OMAPL_MCASP_PDIR_ACLKX_OUTPUT (0x00000001u)
> +
> +#define OMAPL_MCASP_PDIR_AMUTE_MASK (0x02000000u)
> +#define OMAPL_MCASP_PDIR_AMUTE_SHIFT (0x00000019u)
> +#define OMAPL_MCASP_PDIR_AMUTE_RESETVAL (0x00000000u)
> +/* AMUTE Tokens */
> +#define OMAPL_MCASP_PDIR_AMUTE_INPUT (0x00000000u)
> +#define OMAPL_MCASP_PDIR_AMUTE_OUTPUT (0x00000001u)
> +
> +#define OMAPL_MCASP_PDIR_AXR15_MASK (0x00008000u)
> +#define OMAPL_MCASP_PDIR_AXR15_SHIFT (0x0000000Fu)
> +#define OMAPL_MCASP_PDIR_AXR15_RESETVAL (0x00000000u)
> +#define OMAPL_MCASP_PDIR_AXR15_INPUT (0x00000000u)
> +#define OMAPL_MCASP_PDIR_AXR15_OUTPUT (0x00000001u)
> +
> +#define OMAPL_MCASP_PDIR_AXR14_MASK (0x00004000u)
> +#define OMAPL_MCASP_PDIR_AXR14_SHIFT (0x0000000Eu)
> +#define OMAPL_MCASP_PDIR_AXR14_RESETVAL (0x00000000u)
> +#define OMAPL_MCASP_PDIR_AXR14_INPUT (0x00000000u)
> +#define OMAPL_MCASP_PDIR_AXR14_OUTPUT (0x00000001u)
> +
> +#define OMAPL_MCASP_PDIR_AXR13_MASK (0x00002000u)
> +#define OMAPL_MCASP_PDIR_AXR13_SHIFT (0x0000000Du)
> +#define OMAPL_MCASP_PDIR_AXR13_RESETVAL (0x00000000u)
> +#define OMAPL_MCASP_PDIR_AXR13_INPUT (0x00000000u)
> +#define OMAPL_MCASP_PDIR_AXR13_OUTPUT (0x00000001u)
> +
> +#define OMAPL_MCASP_PDIR_AXR12_MASK (0x00001000u)
> +#define OMAPL_MCASP_PDIR_AXR12_SHIFT (0x0000000Cu)
> +#define OMAPL_MCASP_PDIR_AXR12_RESETVAL (0x00000000u)
> +#define OMAPL_MCASP_PDIR_AXR12_INPUT (0x00000000u)
> +#define OMAPL_MCASP_PDIR_AXR12_OUTPUT (0x00000001u)
> +
> +#define OMAPL_MCASP_PDIR_AXR11_MASK (0x00000800u)
> +#define OMAPL_MCASP_PDIR_AXR11_SHIFT (0x0000000Bu)
> +#define OMAPL_MCASP_PDIR_AXR11_RESETVAL (0x00000000u)
> +#define OMAPL_MCASP_PDIR_AXR11_INPUT (0x00000000u)
> +#define OMAPL_MCASP_PDIR_AXR11_OUTPUT (0x00000001u)
> +
> +#define OMAPL_MCASP_PDIR_AXR10_MASK (0x00000400u)
> +#define OMAPL_MCASP_PDIR_AXR10_SHIFT (0x0000000Au)
> +#define OMAPL_MCASP_PDIR_AXR10_RESETVAL (0x00000000u)
> +#define OMAPL_MCASP_PDIR_AXR10_INPUT (0x00000000u)
> +#define OMAPL_MCASP_PDIR_AXR10_OUTPUT (0x00000001u)
> +#define OMAPL_MCASP_PDIR_AXR9_MASK (0x00000200u)
> +#define OMAPL_MCASP_PDIR_AXR9_SHIFT (0x00000009u)
> +#define OMAPL_MCASP_PDIR_AXR9_RESETVAL (0x00000000u)
> +/* AXR9 Tokens */
> +#define OMAPL_MCASP_PDIR_AXR9_INPUT (0x00000000u)
> +#define OMAPL_MCASP_PDIR_AXR9_OUTPUT (0x00000001u)
> +
> +#define OMAPL_MCASP_PDIR_AXR8_MASK (0x00000100u)
> +#define OMAPL_MCASP_PDIR_AXR8_SHIFT (0x00000008u)
> +#define OMAPL_MCASP_PDIR_AXR8_RESETVAL (0x00000000u)
> +/* AXR8 Tokens */
> +#define OMAPL_MCASP_PDIR_AXR8_INPUT (0x00000000u)
> +#define OMAPL_MCASP_PDIR_AXR8_OUTPUT (0x00000001u)
> +
> +#define OMAPL_MCASP_PDIR_AXR7_MASK (0x00000080u)
> +#define OMAPL_MCASP_PDIR_AXR7_SHIFT (0x00000007u)
> +#define OMAPL_MCASP_PDIR_AXR7_RESETVAL (0x00000000u)
> +/*----AXR7 Tokens----*/
> +#define OMAPL_MCASP_PDIR_AXR7_INPUT (0x00000000u)
> +#define OMAPL_MCASP_PDIR_AXR7_OUTPUT (0x00000001u)
> +
> +#define OMAPL_MCASP_PDIR_AXR6_MASK (0x00000040u)
> +#define OMAPL_MCASP_PDIR_AXR6_SHIFT (0x00000006u)
> +#define OMAPL_MCASP_PDIR_AXR6_RESETVAL (0x00000000u)
> +/*----AXR6 Tokens----*/
> +#define OMAPL_MCASP_PDIR_AXR6_INPUT (0x00000000u)
> +#define OMAPL_MCASP_PDIR_AXR6_OUTPUT (0x00000001u)
> +
> +#define OMAPL_MCASP_PDIR_AXR5_MASK (0x00000020u)
> +#define OMAPL_MCASP_PDIR_AXR5_SHIFT (0x00000005u)
> +#define OMAPL_MCASP_PDIR_AXR5_RESETVAL (0x00000000u)
> +/*----AXR5 Tokens----*/
> +#define OMAPL_MCASP_PDIR_AXR5_INPUT (0x00000000u)
> +#define OMAPL_MCASP_PDIR_AXR5_OUTPUT (0x00000001u)
> +
> +#define OMAPL_MCASP_PDIR_AXR4_MASK (0x00000010u)
> +#define OMAPL_MCASP_PDIR_AXR4_SHIFT (0x00000004u)
> +#define OMAPL_MCASP_PDIR_AXR4_RESETVAL (0x00000000u)
> +/*----AXR4 Tokens----*/
> +#define OMAPL_MCASP_PDIR_AXR4_INPUT (0x00000000u)
> +#define OMAPL_MCASP_PDIR_AXR4_OUTPUT (0x00000001u)
> +
> +#define OMAPL_MCASP_PDIR_AXR3_MASK (0x00000008u)
> +#define OMAPL_MCASP_PDIR_AXR3_SHIFT (0x00000003u)
> +#define OMAPL_MCASP_PDIR_AXR3_RESETVAL (0x00000000u)
> +/*----AXR3 Tokens----*/
> +#define OMAPL_MCASP_PDIR_AXR3_INPUT (0x00000000u)
> +#define OMAPL_MCASP_PDIR_AXR3_OUTPUT (0x00000001u)
> +
> +#define OMAPL_MCASP_PDIR_AXR2_MASK (0x00000004u)
> +#define OMAPL_MCASP_PDIR_AXR2_SHIFT (0x00000002u)
> +#define OMAPL_MCASP_PDIR_AXR2_RESETVAL (0x00000000u)
> +/*----AXR2 Tokens----*/
> +#define OMAPL_MCASP_PDIR_AXR2_INPUT (0x00000000u)
> +#define OMAPL_MCASP_PDIR_AXR2_OUTPUT (0x00000001u)
> +
> +#define OMAPL_MCASP_PDIR_AXR1_MASK (0x00000002u)
> +#define OMAPL_MCASP_PDIR_AXR1_SHIFT (0x00000001u)
> +#define OMAPL_MCASP_PDIR_AXR1_RESETVAL (0x00000000u)
> +/*----AXR1 Tokens----*/
> +#define OMAPL_MCASP_PDIR_AXR1_INPUT (0x00000000u)
> +#define OMAPL_MCASP_PDIR_AXR1_OUTPUT (0x00000001u)
> +
> +#define OMAPL_MCASP_PDIR_AXR0_MASK (0x00000001u)
> +#define OMAPL_MCASP_PDIR_AXR0_SHIFT (0x00000000u)
> +#define OMAPL_MCASP_PDIR_AXR0_RESETVAL (0x00000000u)
> +/*----AXR0 Tokens----*/
> +#define OMAPL_MCASP_PDIR_AXR0_INPUT (0x00000000u)
> +#define OMAPL_MCASP_PDIR_AXR0_OUTPUT (0x00000001u)
> +
> +#define OMAPL_MCASP_PDIR_RESETVAL (0x00000000u)
> +
> +#define OMAPL_MCASP_ACLKXCTL_CLKXP_MASK (0x00000080u)
> +#define OMAPL_MCASP_ACLKXCTL_CLKXP_SHIFT (0x00000007u)
> +#define OMAPL_MCASP_ACLKXCTL_CLKXP_RESETVAL (0x00000000u)
> +/*----CLKXP Tokens----*/
> +#define OMAPL_MCASP_ACLKXCTL_CLKXP_RISINGEDGE (0x00000000u)
> +#define OMAPL_MCASP_ACLKXCTL_CLKXP_FALLINGEDGE (0x00000001u)
> +
> +#define OMAPL_MCASP_ACLKXCTL_ASYNC_MASK (0x00000040u)
> +#define OMAPL_MCASP_ACLKXCTL_ASYNC_SHIFT (0x00000006u)
> +#define OMAPL_MCASP_ACLKXCTL_ASYNC_RESETVAL (0x00000001u)
> +/*----ASYNC Tokens----*/
> +#define OMAPL_MCASP_ACLKXCTL_ASYNC_SYNC (0x00000000u)
> +#define OMAPL_MCASP_ACLKXCTL_ASYNC_ASYNC (0x00000001u)
> +
> +#define OMAPL_MCASP_ACLKXCTL_CLKXM_MASK (0x00000020u)
> +#define OMAPL_MCASP_ACLKXCTL_CLKXM_SHIFT (0x00000005u)
> +#define OMAPL_MCASP_ACLKXCTL_CLKXM_RESETVAL (0x00000001u)
> +/*----CLKXM Tokens----*/
> +#define OMAPL_MCASP_ACLKXCTL_CLKXM_EXTERNAL (0x00000000u)
> +#define OMAPL_MCASP_ACLKXCTL_CLKXM_INTERNAL (0x00000001u)
> +
> +#define OMAPL_MCASP_ACLKXCTL_CLKXDIV_MASK (0x0000001Fu)
> +#define OMAPL_MCASP_ACLKXCTL_CLKXDIV_SHIFT (0x00000000u)
> +#define OMAPL_MCASP_ACLKXCTL_CLKXDIV_RESETVAL (0x00000000u)
> +
> +#define OMAPL_MCASP_ACLKXCTL_RESETVAL (0x00000060u)
> +
> +/* AHCLKXCTL */
> +#define OMAPL_MCASP_AHCLKXCTL_HCLKXM_MASK (0x00008000u)
> +#define OMAPL_MCASP_AHCLKXCTL_HCLKXM_SHIFT (0x0000000Fu)
> +#define OMAPL_MCASP_AHCLKXCTL_HCLKXM_RESETVAL (0x00000001u)
> +/*----HCLKXM Tokens----*/
> +#define OMAPL_MCASP_AHCLKXCTL_HCLKXM_EXTERNAL (0x00000000u)
> +#define OMAPL_MCASP_AHCLKXCTL_HCLKXM_INTERNAL (0x00000001u)
> +
> +#define OMAPL_MCASP_AHCLKXCTL_HCLKXP_MASK (0x00004000u)
> +#define OMAPL_MCASP_AHCLKXCTL_HCLKXP_SHIFT (0x0000000Eu)
> +#define OMAPL_MCASP_AHCLKXCTL_HCLKXP_RESETVAL (0x00000000u)
> +/*----HCLKXP Tokens----*/
> +#define OMAPL_MCASP_AHCLKXCTL_HCLKXP_NOTINVERTED (0x00000000u)
> +#define OMAPL_MCASP_AHCLKXCTL_HCLKXP_INVERTED (0x00000001u)
> +
> +#define OMAPL_MCASP_AHCLKXCTL_HCLKXDIV_MASK (0x00000FFFu)
> +#define OMAPL_MCASP_AHCLKXCTL_HCLKXDIV_SHIFT (0x00000000u)
> +#define OMAPL_MCASP_AHCLKXCTL_HCLKXDIV_RESETVAL (0x00000000u)
> +
> +#define OMAPL_MCASP_AHCLKXCTL_RESETVAL (0x00008000u)
> +
> +#define MCASP_SUART_GBLCTL (0X00000000)
> +#define MCASP_SUART_RGBLCTL (0X00000000)
> +#define MCASP_SUART_XGBLCTL (0X00000000)
> +#define MCASP_SUART_RMASK_8 (0x000000FF)
> +#define MCASP_SUART_RMASK_16 (0x0000FFFF)
> +#define MCASP_SUART_RFMT_8 (0x0000A038)
> +#define MCASP_SUART_RFMT_16 (0x0000A078)
> +#define MCASP_SUART_FSRM (0X00000002)
> +#define MCASP_SUART_CLKRM_CLKRP (0X000000A0)
> +#define MCASP_SUART_HCLKRP (0X00008000)
> +#define MCASP_SUART_RTDMS0 (0X00000001)
> +#define MCASP_SUART_RSYNCERR (0X00000002)
> +#define MCASP_SUART_RMAX_RPS_256 (0x00FF0008)
> +#define MCASP_SUART_XMASK_0_31 (0X0000FFFF)
> +#define MCASP_SUART_XBUSEL_XSSZ_16_XPAD_0 (0x00002078)
> +#define MCASP_SUART_FSXM (0x00000002)
> +#define MCASP_SUART_CLKXM_ASYNC_CLKXP (0x000000E0)
> +#define MCASP_SUART_HCLKXM (0x00008000)
> +#define MCASP_SUART_XTDMS0 (0X00000001)
> +#define MCASP_SUART_XSYNCERR (0x00000002)
> +#define MCASP_SUART_XMAX_XPS_256 (0x00FF0008)
> +#define MCASP_SUART_SRCTL_DISMOD (0x0000000c)
> +#define MCASP_SUART_DIT_DISABLE (0X00000000)
> +#define MCASP_SUART_LOOPBACK_DISABLE (0x00000000)
> +#define MCASP_SUART_AMUTE_DISABLE (0X00000000)
> +#define MCASP_SUART_XSTAT (0x0000FFFF)
> +#define MCASP_SUART_RSTAT (0x0000FFFF)
> +
> +/* SUART REGS */
> +
> +/* PRU0 DATA RAM base address */
> +#define PRU0_DATARAM_OFFSET (0x0000u)
> +/* PRU1 DATA RAM base address */
> +#define PRU1_DATARAM_OFFSET (0x2000u)
> +
> +/* PRU0 DATA RAM size */
> +#define PRU0_DATARAM_SIZE (0x200u)
> +/* PRU1 DATA RAM size */
> +#define PRU1_DATARAM_SIZE (0x200u)
> +
> +#define PRU_SUART_PRU0_CH0_OFFSET (0x0000)
> +#define PRU_SUART_PRU0_CH1_OFFSET (0x0010)
> +#define PRU_SUART_PRU0_CH2_OFFSET (0x0020)
> +#define PRU_SUART_PRU0_CH3_OFFSET (0x0030)
> +#define PRU_SUART_PRU0_CH4_OFFSET (0x0040)
> +#define PRU_SUART_PRU0_CH5_OFFSET (0x0050)
> +#define PRU_SUART_PRU0_CH6_OFFSET (0x0060)
> +#define PRU_SUART_PRU0_CH7_OFFSET (0x0070)
> +#define PRU_SUART_PRU0_IMR_OFFSET (0x0080)
> +/* Interrupt Mask Register */
> +#define PRU_SUART_PRU0_ISR_OFFSET (0x0082)
> +/* Interrupt Status Register */
> +#define PRU_SUART_PRU0_ID_ADDR (0x0084)
> +/* PRU ID Register */
> +#define PRU_SUART_PRU0_RX_TX_MODE (0x0085)
> +#define PRU_SUART_PRU0_DELAY_OFFSET (0x0086)
> +#define PRU_SUART_PRU0_IDLE_TIMEOUT_OFFSET (0x0088)
> +
> +/* PRU 1 Macros */
> +#define PRU_SUART_PRU1_CH0_OFFSET (0x2000)
> +#define PRU_SUART_PRU1_CH1_OFFSET (0x2010)
> +#define PRU_SUART_PRU1_CH2_OFFSET (0x2020)
> +#define PRU_SUART_PRU1_CH3_OFFSET (0x2030)
> +#define PRU_SUART_PRU1_CH4_OFFSET (0x2040)
> +#define PRU_SUART_PRU1_CH5_OFFSET (0x2050)
> +#define PRU_SUART_PRU1_CH6_OFFSET (0x2060)
> +#define PRU_SUART_PRU1_CH7_OFFSET (0x2070)
> +#define PRU_SUART_PRU1_IMR_OFFSET (0x2080)
> +#define PRU_SUART_PRU1_ISR_OFFSET (0x2082)
> +#define PRU_SUART_PRU1_ID_ADDR (0x2084)
> +#define PRU_SUART_PRU1_RX_TX_MODE (0x2085)
> +#define PRU_SUART_PRU1_DELAY_OFFSET (0x2086)
> +#define PRU_SUART_PRU1_IDLE_TIMEOUT_OFFSET (0x2088)
> +
> +/* SUART Channel Control Register bit descriptions */
> +#define PRU_SUART_CH_CTRL_MODE_SHIFT 0x0000
> +#define PRU_SUART_CH_CTRL_MODE_MASK 0x0003
> +#define PRU_SUART_CH_CTRL_TX_MODE 0x0001
> +#define PRU_SUART_CH_CTRL_RX_MODE 0x0002
> +
> +/* Service Request */
> +#define PRU_SUART_CH_CTRL_SREQ_SHIFT 0x0002
> +#define PRU_SUART_CH_CTRL_SREQ_MASK 0x0004
> +#define PRU_SUART_CH_CTRL_SREQ 0x0001
> +
> +/* McASP Instance */
> +#define PRU_SUART_CH_CTRL_MCASP_SHIFT 0x0003
> +#define PRU_SUART_CH_CTRL_MCASP_MASK 0x0018
> +#define PRU_SUART_CH_CTRL_SR_SHIFT 0x0008
> +#define PRU_SUART_CH_CTRL_SR_MASK 0x0F00
> +
> +/* SUART channel configuration1 register descriptions */
> +
> +/* clock divisor -  relative baud value */
> +#define PRU_SUART_CH_CONFIG1_DIVISOR_SHIFT 0x0000
> +#define PRU_SUART_CH_CONFIG1_DIVISOR_MASK 0x03FF
> +/* oversampling */
> +#define PRU_SUART_CH_CONFIG1_OVS_SHIFT 0x000A
> +#define PRU_SUART_CH_CONFIG1_OVS_MASK 0x0C00
> +
> +/* SUART channel configuration2 register descriptions */
> +/* Bits per character */
> +#define PRU_SUART_CH_CONFIG2_BITPERCHAR_SHIFT 0x0000
> +#define PRU_SUART_CH_CONFIG2_BITPERCHAR_MASK 0x000F
> +
> +/* Bits per character */
> +#define PRU_SUART_CH_CONFIG2_DATALEN_SHIFT 0x0008
> +#define PRU_SUART_CH_CONFIG2_DATALEN_MASK 0x0F00
> +
> +/* SUART Channel STATUS Register*/
> +#define PRU_SUART_CH_STATUS_EN_BIT_MASK 0x8000
> +
> +/* SUART Channel register offsets */
> +#define PRU_SUART_CH_CTRL_OFFSET 0x00
> +#define PRU_SUART_CH_CONFIG1_OFFSET 0x02
> +#define PRU_SUART_CH_CONFIG2_OFFSET 0x04
> +#define PRU_SUART_CH_TXRXSTATUS_OFFSET 0x06
> +#define PRU_SUART_CH_TXRXDATA_OFFSET 0x08
> +#define PRU_SUART_CH_BYTESDONECNTR_OFFSET 0x0C
> +
> +/* SUART Event Numbers macros */
> +#define PRU_SUART0_TX_EVT 34
> +#define PRU_SUART0_RX_EVT 35
> +#define PRU_SUART1_TX_EVT 36
> +#define PRU_SUART1_RX_EVT 37
> +#define PRU_SUART2_TX_EVT 38
> +#define PRU_SUART2_RX_EVT 39
> +#define PRU_SUART3_TX_EVT 40
> +#define PRU_SUART3_RX_EVT 41
> +#define PRU_SUART4_TX_EVT 42
> +#define PRU_SUART4_RX_EVT 43
> +#define PRU_SUART5_TX_EVT 44
> +#define PRU_SUART5_RX_EVT 45
> +#define PRU_SUART6_TX_EVT 46
> +#define PRU_SUART6_RX_EVT 47
> +#define PRU_SUART7_TX_EVT 48
> +#define PRU_SUART7_RX_EVT 49
> +
> +#define PRU_SUART0_TX_EVT_BIT BIT(2)
> +#define PRU_SUART0_RX_EVT_BIT BIT(3)
> +#define PRU_SUART1_TX_EVT_BIT BIT(4)
> +#define PRU_SUART1_RX_EVT_BIT BIT(5)
> +#define PRU_SUART2_TX_EVT_BIT BIT(6)
> +#define PRU_SUART2_RX_EVT_BIT BIT(7)
> +#define PRU_SUART3_TX_EVT_BIT BIT(8)
> +#define PRU_SUART3_RX_EVT_BIT BIT(9)
> +#define PRU_SUART4_TX_EVT_BIT BIT(10)
> +#define PRU_SUART4_RX_EVT_BIT BIT(11)
> +#define PRU_SUART5_TX_EVT_BIT BIT(12)
> +#define PRU_SUART5_RX_EVT_BIT BIT(13)
> +#define PRU_SUART6_TX_EVT_BIT BIT(14)
> +#define PRU_SUART6_RX_EVT_BIT BIT(15)
> +#define PRU_SUART7_TX_EVT_BIT BIT(16)
> +#define PRU_SUART7_RX_EVT_BIT BIT(17)
> +
> +/* Total number of baud rates supported */
> +#define SUART_NUM_OF_BAUDS_SUPPORTED 13
> +
> +#define MCASP_PDIR_VAL ( \
> + OMAPL_MCASP_PDIR_AFSR_OUTPUT<<OMAPL_MCASP_PDIR_AFSR_SHIFT | \
> + OMAPL_MCASP_PDIR_AHCLKR_OUTPUT<<OMAPL_MCASP_PDIR_AHCLKR_SHIFT | \
> + OMAPL_MCASP_PDIR_ACLKR_OUTPUT<<OMAPL_MCASP_PDIR_ACLKR_SHIFT | \
> + OMAPL_MCASP_PDIR_AFSX_OUTPUT<<OMAPL_MCASP_PDIR_AFSX_SHIFT | \
> + OMAPL_MCASP_PDIR_AHCLKX_OUTPUT<<OMAPL_MCASP_PDIR_AHCLKX_SHIFT | \
> + OMAPL_MCASP_PDIR_ACLKX_OUTPUT<<OMAPL_MCASP_PDIR_ACLKX_SHIFT)
> +
> +/*
> + *  This enum is used to specify the direction of the channel in UART
> + */
> +enum SUART_CHN_DIR {
> + SUART_CHN_TX = 1,
> + SUART_CHN_RX = 2
> +};
> +
> +/*
> + *  This enum is used to specify the state of the channel in UART. It
> + *  is either enabled or disabled.
> + */
> +enum SUART_CHN_STATE {
> + SUART_CHN_DISABLED = 0,
> + SUART_CHN_ENABLED = 1
> +};
> +
> +enum SUART_EN_BITSPERCHAR {
> + ePRU_SUART_DATA_BITS6 = 8,
> + ePRU_SUART_DATA_BITS7,
> + ePRU_SUART_DATA_BITS8,
> + ePRU_SUART_DATA_BITS9,
> + ePRU_SUART_DATA_BITS10,
> + ePRU_SUART_DATA_BITS11,
> + ePRU_SUART_DATA_BITS12
> +};
> +
> +enum SUART_EN_UARTNUM {
> + ePRU_SUART_NUM_1 = 1,
> + ePRU_SUART_NUM_2,
> + ePRU_SUART_NUM_3,
> + ePRU_SUART_NUM_4,
> + ePRU_SUART_NUM_5,
> + ePRU_SUART_NUM_6,
> + ePRU_SUART_NUM_7,
> + ePRU_SUART_NUM_8
> +};
> +
> +enum SUART_EN_UARTTYPE {
> + ePRU_SUART_HALF_TX = 1,
> + ePRU_SUART_HALF_RX,
> + ePRU_SUART_FULL_TX_RX,
> + ePRU_SUART_HALF_TX_DISABLED = 4,
> + ePRU_SUART_HALF_RX_DISABLED = 8
> +};
> +
> +enum SUART_EN_TXCHANNEL {
> + ePRU_SUART_TX_CH0 = 0,
> + ePRU_SUART_TX_CH1,
> + ePRU_SUART_TX_CH2,
> + ePRU_SUART_TX_CH3,
> + ePRU_SUART_TX_CH4,
> + ePRU_SUART_TX_CH5,
> + ePRU_SUART_TX_CH6,
> + ePRU_SUART_TX_CH7
> +};
> +
> +enum SUART_EN_RXCHANNEL {
> + ePRU_SUART_RX_CH0 = 0,
> + ePRU_SUART_RX_CH1,
> + ePRU_SUART_RX_CH2,
> + ePRU_SUART_RX_CH3,
> + ePRU_SUART_RX_CH4,
> + ePRU_SUART_RX_CH5,
> + ePRU_SUART_RX_CH6,
> + ePRU_SUART_RX_CH7
> +};
> +
> +enum SUART_EN_UART_STATUS {
> + ePRU_SUART_UART_FREE = 0,
> + ePRU_SUART_UART_IN_USE
> +};
> +
> +struct pru_suart_cnh_cntrl_config1 {
> + u32 mode:2;
> + u32 service_req:1;
> + u32 asp_id:2;
> + u32 reserved1:3;
> + u32 serializer_num:4;
> + u32 reserved2:4;
> + u32 presacler:10;
> + u32 over_sampling:2;
> + u32 framing_mask:1;
> + u32 break_mask:1;
> + u32 timeout_mask:1;
> + u32 reserved3:1;
> +};
> +
> +struct pru_suart_chn_config2_status {
> + u32 bits_per_char:4;
> + u32 reserved1:4;
> + u32 data_len:4;
> + u32 reserved2:4;
> + u32 txrx_ready:1;
> + u32 txrx_complete:1;
> + u32 txrx_error:1;
> + u32 txrx_underrun:1;
> + u32 framing_error:1;
> + u32 break_error:1;
> + u32 timeout_error:1;
> + u32 reserved3:8;
> + u32 chn_state:1;
> +};
> +
> +struct pru_suart_regs_ovly {
> + struct pru_suart_cnh_cntrl_config1 ch_ctrl_config1;
> + struct pru_suart_chn_config2_status ch_config2_txrx_status;
> + u32 ch_txrx_data;
> + u32 reserved1;
> +};
> +
> +struct pru_suart_tx_cntx_priv {
> + u32 asp_xsrctl_base;
> + u32 asp_xbuf_base;
> + u16 buff_addr;
> + u8 buff_size;
> + u8 bits_loaded;
> +};
> +
> +struct pru_suart_rx_cntx_priv {
> + u32 asp_rbuf_base;
> + u32 asp_rsrctl_base;
> + u32 reserved1;
> + u32 reserved2;
> + u32 reserved3;
> + u32 reserved4;
> +};
> +
> +struct suart_config {
> + u8  tx_serializer;
> + u8  rx_serializer;
> + u16 tx_clk_divisor;
> + u16 rx_clk_divisor;
> + u8  tx_bits_per_char;
> + u8  rx_bits_per_char;
> + u8  oversampling;
> + u8  bi_inter_mask;
> + u8  fe_intr_mask;
> +};
> +
> +struct suart_handle {
> + u16 uart_num;
> + u16 uart_type;
> + u16 uart_tx_channel;
> + u16 uart_rx_channel;
> + u16 uart_status;
> +};
> +
> +struct pruss_suart_iomap {
> + void __iomem *mcasp_io_addr;
> + void *p_fifo_buff_phys_base;
> + void *p_fifo_buff_virt_base;
> +};
> +
> +struct pruss_suart_initparams {
> + u32 tx_baud_value;
> + u32 rx_baud_value;
> + u32 oversampling;
> +};
> +
> +/* MCASP */
> +struct omapl_mcasp_regs_ovly {
> + u32 revid;
> + u32 rsvd0[3];
> + u32 pfunc;
> + u32 pdir;
> + u32 pdout;
> + u32 pdin;
> + u32 pdclr;
> + u32 rsvd1[8];
> + u32 gblctl;
> + u32 amute;
> + u32 dlbctl;
> + u32 ditctl;
> + u32 rsvd2[3];
> + u32 rgblctl;
> + u32 rmask;
> + u32 rfmt;
> + u32 afsrctl;
> + u32 aclkrctl;
> + u32 ahclkrctl;
> + u32 rtdm;
> + u32 rintctl;
> + u32 rstat;
> + u32 rslot;
> + u32 rclkchk;
> + u32 revtctl;
> + u32 rsvd3[4];
> + u32 xgblctl;
> + u32 xmask;
> + u32 xfmt;
> + u32 afsxctl;
> + u32 aclkxctl;
> + u32 ahclkxctl;
> + u32 xtdm;
> + u32 xintctl;
> + u32 xstat;
> + u32 xslot;
> + u32 xclkchk;
> + u32 xevtctl;
> + u32 rsvd4[12];
> + u32 ditcsra[6];
> + u32 ditcsrb[6];
> + u32 ditudra[6];
> + u32 ditudrb[6];
> + u32 rsvd5[8];
> + u32 srctl0;
> + u32 srctl1;
> + u32 srctl2;
> + u32 srctl3;
> + u32 srctl4;
> + u32 srctl5;
> + u32 srctl6;
> + u32 srctl7;
> + u32 srctl8;
> + u32 srctl9;
> + u32 srctl10;
> + u32 srctl11;
> + u32 srctl12;
> + u32 srctl13;
> + u32 srctl14;
> + u32 srctl15;
> + u32 rsvd6[16];
> + u32 xbuf[16];
> + u32 rsvd7[16];
> + u32 rbuf[16];
> +};
> +
> +/*
> + *  SUART Config regs
> + */
> +struct suart_struct_pru_regs {
> + u16 chn_ctrl;
> + u16 chn_config1;
> + u16 chn_config2;
> + u16 chn_txrx_status;
> + u32 chn_txrx_data;
> +};
> +
> +extern s32 pru_softuart_init(struct device *dev,
> + struct pruss_suart_initparams *,
> + const u8 *pru_suart_emu_code, u32 fw_size,
> + u32 clk_rate_pruss,
> + struct pruss_suart_iomap *pruss_ioaddr);
> +
> +extern s32 pru_softuart_open(struct suart_handle *h_suart);
> +
> +extern s32 pru_softuart_close(struct suart_handle *h_uart);
> +
> +extern s32 pru_softuart_setbaud(struct device *dev,
> + struct suart_handle *h_uart,
> + u16 tx_clk_divisor, u16 rx_clk_divisor);
> +
> +extern s32 pru_softuart_setdatabits(struct device *dev,
> + struct suart_handle *h_uart,
> + u16 tx_data_bits, u16 rx_data_bits);
> +
> +extern s32 pru_softuart_setconfig(struct device *dev,
> + struct suart_handle *h_uart,
> + struct suart_config *config_uart);
> +
> +extern s32 pru_softuart_getconfig(struct device *dev,
> + struct suart_handle *h_uart,
> + struct suart_config *config_uart);
> +
> +extern s32 pru_softuart_pending_tx_request(struct device *dev);
> +
> +extern s32 pru_softuart_write(struct device *dev,
> + struct suart_handle *h_uart,
> + u32 *pt_tx_data_buf, u16 data_len);
> +
> +extern s32 pru_softuart_read(struct device *dev,
> + struct suart_handle *h_uart,
> + u32 *pt_data_buf, u16 data_len);
> +
> +extern s32 suart_intr_clrmask(struct device *dev, u16 uart_num,
> + u32 txrxmode,
> + u32 intrmask);
> +
> +extern s32 pru_softuart_clr_tx_status(struct device *dev,
> + struct suart_handle *h_uart);
> +
> +extern s32 pru_softuart_get_tx_status(struct device *dev,
> + struct suart_handle *h_uart);
> +
> +extern s32 pru_softuart_clr_rx_status(struct device *dev,
> + struct suart_handle *h_uart);
> +
> +extern s32 pru_softuart_get_rx_status(struct device *dev,
> + struct suart_handle *h_uart);
> +
> +extern s32 pru_softuart_get_isrstatus(struct device *dev, u16 uart_num,
> + u16 *txrx_flag);
> +
> +extern s32 pru_intr_clr_isrstatus(struct device *dev, u16 uart_num,
> + u32 txrxmode);
> +
> +extern s32 suart_intr_getmask(struct device *dev, u16 uart_num,
> + u32 txrxmode,
> + u32 intrmask);
> +
> +extern s32 suart_intr_setmask(struct device *dev, u16 uart_num,
> + u32 txrxmode, u32 intrmask);
> +
> +extern s32 pru_softuart_get_tx_data_len(struct device *dev,
> + struct suart_handle *h_uart);
> +
> +extern s32 pru_softuart_get_rx_data_len(struct device *dev,
> + struct suart_handle *h_uart);
> +
> +extern s32 suart_arm_to_pru_intr(struct device *dev, u16 uart_num);
> +
> +extern void pru_mcasp_deinit(void);
> +
> +extern s32 pru_softuart_read_data(struct device *dev,
> + struct suart_handle *h_uart,
> + u8 *p_data_buffer, s32 max_len,
> + u32 *pdata_read);
> +
> +extern s32 pru_softuart_stop_receive(struct device *dev,
> + struct suart_handle *h_uart);
> +
> +extern s32 suart_pru_to_host_intr_enable(struct device *dev,
> + u16 uart_num,
> + u32 txrxmode, s32 flag);
> +
> +extern void pru_set_fifo_timeout(struct device *dev, s16 timeout);
> +
> +extern void suart_mcasp_config(u32 tx_baud_value,
> + u32 rx_baud_value, u32 oversampling,
> + struct pruss_suart_iomap *pruss_ioaddr);
> +
> +extern void suart_mcasp_reset(struct pruss_suart_iomap *pruss_ioaddr);
> +
> +extern short suart_asp_baud_set(u32 tx_baud_value,
> + u32 rx_baud_value, u32 oversampling,
> + struct pruss_suart_iomap *pruss_ioaddr);
> +
> +extern short suart_asp_serializer_deactivate(u16 sr_num,
> + struct pruss_suart_iomap *pruss_ioaddr);
> +
> +extern void suart_mcasp_tx_serialzier_set(u32 serializer_num,
> + struct pruss_suart_iomap *pruss_ioaddr);
> +#endif
> diff --git a/drivers/tty/serial/pruss_suart_api.c 
> b/drivers/tty/serial/pruss_suart_api.c
> new file mode 100644
> index 0000000..15178f5
> --- /dev/null
> +++ b/drivers/tty/serial/pruss_suart_api.c
> @@ -0,0 +1,1710 @@
> +/*
> + * Copyright (C) 2010, 2011 Texas Instruments Incorporated
> + * Author: Jitendra Kumar <jitendra@mistralsolutions.com>
> + *
> + * This program is free software; you can redistribute it and/or modify 
> it
> + * under the terms of the GNU General Public License as  published by the
> + * Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
> + * whether express or implied; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * General Public License for more details.
> + */
> +
> +#include <linux/types.h>
> +#include <linux/mfd/pruss.h>
> +#include "pruss_suart.h"
> +
> +static u8 uart_statu_table[8];
> +static struct pruss_suart_iomap suart_iomap;
> +
> +static u32 uart_rx[8] = {PRU_SUART0_CONFIG_RX_SER, 
> PRU_SUART1_CONFIG_RX_SER,
> + PRU_SUART2_CONFIG_RX_SER, PRU_SUART3_CONFIG_RX_SER,
> + PRU_SUART4_CONFIG_RX_SER, PRU_SUART5_CONFIG_RX_SER,
> + PRU_SUART6_CONFIG_RX_SER, PRU_SUART7_CONFIG_RX_SER};
> +
> +static u32 uart_tx[8] = {PRU_SUART0_CONFIG_TX_SER, 
> PRU_SUART1_CONFIG_TX_SER,
> + PRU_SUART2_CONFIG_TX_SER, PRU_SUART3_CONFIG_TX_SER,
> + PRU_SUART4_CONFIG_TX_SER, PRU_SUART5_CONFIG_TX_SER,
> + PRU_SUART6_CONFIG_TX_SER, PRU_SUART7_CONFIG_TX_SER};
> +
> +static u32 uart_config[8] = {PRU_SUART0_CONFIG_DUPLEX, 
> PRU_SUART1_CONFIG_DUPLEX,
> + PRU_SUART2_CONFIG_DUPLEX, PRU_SUART3_CONFIG_DUPLEX,
> + PRU_SUART4_CONFIG_DUPLEX, PRU_SUART5_CONFIG_DUPLEX,
> + PRU_SUART6_CONFIG_DUPLEX, PRU_SUART7_CONFIG_DUPLEX};
> +
> +static  s32 pru_softuart_clr_rx_fifo(struct device *dev,
> + struct suart_handle *h_uart);
> +static s32 arm_to_pru_intr_init(struct device *dev);
> +
> +#if (PRU_ACTIVE == BOTH_PRU)
> +static void pru_set_ram_data(struct device *dev,
> + struct pruss_suart_iomap *pruss_ioaddr)
> +{
> + u32 datatowrite;
> + u32 i;
> + struct pru_suart_regs_ovly *pru_suart_regs = NULL;
> + u32 __iomem *p_sr_ctl_addr = (u32 __iomem *)(pruss_ioaddr->
> + mcasp_io_addr + 0x180);
> + struct pru_suart_tx_cntx_priv *pru_suart_tx_priv = NULL;
> + struct pru_suart_rx_cntx_priv *pru_suart_rx_priv = NULL;
> +
> + /* RX PRU - 0 Chanel 0-7 context information */
> + for (i = 0; i < 8; i++, pru_suart_regs++) {
> + pruss_rmwl(dev, (u32) &pru_suart_regs->ch_ctrl_config1,
> + 0x3, SUART_CHN_RX);
> + pruss_rmwl(dev, (u32) &pru_suart_regs->ch_ctrl_config1,
> + (0xF << SERIALIZER_OFFSET),
> + ((0xF & uart_rx[i]) << SERIALIZER_OFFSET));
> + pruss_rmwl(dev, (u32) &pru_suart_regs->ch_ctrl_config1,
> + (0x3 << SUART_DEFAULT_OVRSMPL_OFFSET),
> + (SUART_DEFAULT_OVRSMPL <<
> + SUART_DEFAULT_OVRSMPL_OFFSET));
> + pruss_rmwl(dev, (u32) &pru_suart_regs->ch_config2_txrx_status,
> + 0xF, 8);
> + if ((uart_config[i] & PRU_SUART_HALF_RX_DISABLED) ==
> + PRU_SUART_HALF_RX_DISABLED) {
> + pruss_rmwl(dev,
> + (u32) &pru_suart_regs->ch_config2_txrx_status,
> + (0x1 << SUART_CHN_OFFSET),
> + (SUART_CHN_DISABLED << SUART_CHN_OFFSET));
> + } else {
> + pruss_rmwl(dev,
> + (u32) &pru_suart_regs->ch_config2_txrx_status,
> + (0x1 << SUART_CHN_OFFSET),
> + (SUART_CHN_ENABLED << SUART_CHN_OFFSET));
> + iowrite32(MCASP_SRCTL_RX_MODE, p_sr_ctl_addr +
> + uart_rx[i]);
> + }
> + /*
> + * RX is active by default, write the dummy received data at
> + * PRU RAM addr 0x1FC to avoid memory corruption.
> + */
> + pruss_rmwl(dev, (u32) &pru_suart_regs->ch_txrx_data,
> + 0xFFFF, RX_DEFAULT_DATA_DUMP_ADDR);
> + pruss_rmwl(dev, (u32) &pru_suart_regs->reserved1, 0xFFFF, 0);
> + /* SUART1 RX context base addr */
> + pru_suart_rx_priv = (struct pru_suart_rx_cntx_priv *)
> + (PRU0_DATARAM_OFFSET + (0x090 + (i * 0x020)));
> + datatowrite = (MCASP_RBUF_BASE_ADDR + (uart_rx[i] << 2));
> + pruss_writel(dev, (u32) &pru_suart_rx_priv->asp_rbuf_base,
> + datatowrite);
> + datatowrite = (MCASP_SRCTL_BASE_ADDR + (uart_rx[i] << 2));
> + pruss_writel(dev, (u32) &pru_suart_rx_priv->asp_rsrctl_base,
> + datatowrite);
> + }
> +
> + /* PRU1 RAM BASE ADDR */
> + pru_suart_regs = (struct pru_suart_regs_ovly *) PRU1_DATARAM_OFFSET;
> +
> + /* TX PRU - 1 */
> + /* Channel 0-7 context information */
> + for (i = 0; i < 8; i++, pru_suart_regs++) {
> + pruss_rmwl(dev, (u32) &pru_suart_regs->ch_ctrl_config1,
> + 0x3, SUART_CHN_TX);
> + pruss_rmwl(dev, (u32) &pru_suart_regs->ch_ctrl_config1,
> + (0xF << SERIALIZER_OFFSET),
> + ((0xF & uart_tx[i]) << SERIALIZER_OFFSET));
> + pruss_rmwl(dev, (u32) &pru_suart_regs->ch_ctrl_config1,
> + (0x3 << SUART_DEFAULT_OVRSMPL_OFFSET),
> + (SUART_DEFAULT_OVRSMPL <<
> + SUART_DEFAULT_OVRSMPL_OFFSET));
> + pruss_rmwl(dev,
> + (u32) &pru_suart_regs->ch_config2_txrx_status, 0xF, 8);
> +
> + if ((uart_config[i] & PRU_SUART_HALF_TX_DISABLED) ==
> + PRU_SUART_HALF_TX_DISABLED) {
> + pruss_rmwl(dev, (u32)
> + &pru_suart_regs->ch_config2_txrx_status,
> + (0x1 << SUART_CHN_OFFSET),
> + (SUART_CHN_DISABLED << SUART_CHN_OFFSET));
> + } else {
> + pruss_rmwl(dev,
> + (u32) &pru_suart_regs->ch_config2_txrx_status,
> + (0x1 << SUART_CHN_OFFSET),
> + (SUART_CHN_ENABLED << SUART_CHN_OFFSET));
> + iowrite32(MCASP_SRCTL_TX_MODE,
> + p_sr_ctl_addr + uart_tx[i]);
> + }
> + pruss_rmwl(dev, (u32) &pru_suart_regs->reserved1, 0xFFFF, 1);
> +
> + /* SUART1 TX context base addr */
> + pru_suart_tx_priv = (struct pru_suart_tx_cntx_priv *)
> + (PRU1_DATARAM_OFFSET + (0x0B0 + (i * 0x02C)));
> + datatowrite = (MCASP_SRCTL_BASE_ADDR + (uart_tx[i] << 2));
> + pruss_writel(dev, (u32) &pru_suart_tx_priv->asp_xsrctl_base,
> + datatowrite);
> + datatowrite = (MCASP_XBUF_BASE_ADDR + (uart_tx[i] << 2));
> + pruss_writel(dev, (u32) &pru_suart_tx_priv->asp_xbuf_base,
> + datatowrite);
> + /* SUART1 TX formatted data base addr */
> + datatowrite = (0x0090 + (i * 0x002C));
> + pruss_writel(dev, (u32) &pru_suart_tx_priv->buff_addr,
> + datatowrite);
> + }
> +}
> +#else
> +static void pru_set_ram_data(struct device *dev,
> + struct pruss_suart_iomap *pruss_ioaddr)
> +{
> +
> + struct pru_suart_regs_ovly *pru_suart_regs =
> + (struct pru_suart_regs_ovly *)pruss_ioaddr->pru_io_addr;
> + u32 i;
> + u32 *p_sr_ctl_addr = (u32 *)(pruss_ioaddr->mcasp_io_addr + 0x180);
> + struct pru_suart_tx_cntx_priv *pru_suart_tx_priv = NULL;
> + struct pru_suart_rx_cntx_priv *pru_suart_rx_priv = NULL;
> +
> + /* Channel 0 context information is Tx */
> + for (i = 0; i < 4; i++, pru_suart_regs++) {
> + pruss_rmwl(dev, (u32) &pru_suart_regs->ch_ctrl_config1,
> + 0x3, SUART_CHN_TX);
> + pruss_rmwl(dev, (u32) &pru_suart_regs->ch_ctrl_config1,
> + (0xF << SERIALIZER_OFFSET),
> + ((0xF & uart_tx[i]) << SERIALIZER_OFFSET));
> + pruss_rmwl(dev, (u32) &pru_suart_regs->ch_ctrl_config1,
> + (0x3 << SUART_DEFAULT_OVRSMPL_OFFSET),
> + (SUART_DEFAULT_OVRSMPL <<
> + SUART_DEFAULT_OVRSMPL_OFFSET));
> + pruss_rmwl(dev, (u32) &pru_suart_regs->ch_config2_txrx_status,
> + 0xF, 8);
> + if ((uart_config[i] & PRU_SUART_HALF_TX_DISABLED) ==
> + PRU_SUART_HALF_TX_DISABLED){
> + pruss_rmwl(dev, (u32)
> + &pru_suart_regs->ch_config2_txrx_status,
> + (0x1 << SUART_CHN_OFFSET),
> + (SUART_CHN_DISABLED << SUART_CHN_OFFSET));
> + } else {
> + pruss_rmwl(dev,
> + (u32) &pru_suart_regs->ch_config2_txrx_status,
> + (0x1 << SUART_CHN_OFFSET),
> + (SUART_CHN_ENABLED << SUART_CHN_OFFSET));
> + iowrite32(MCASP_SRCTL_TX_MODE,
> + p_sr_ctl_addr + uart_tx[i]);
> + }
> + pruss_rmwl(dev, (u32) &pru_suart_regs->reserved1, 0xFFFF, 1);
> +
> + /* SUART1 TX context base addr */
> + pru_suart_tx_priv = (struct pru_suart_tx_cntx_priv *)
> + (PRU0_DATARAM_OFFSET + (0x0B0 + (i * 0x50)));
> + pruss_writel(dev, (u32) &pru_suart_tx_priv->asp_xsrctl_base,
> + (MCASP_SRCTL_BASE_ADDR + (uart_tx[i] << 2)));
> + pruss_writel(dev, (u32) &pru_suart_tx_priv->asp_xbuf_base,
> + (MCASP_XBUF_BASE_ADDR + (uart_tx[i] << 2)));
> + /* SUART1 TX formatted data base addr */
> + pruss_writel(dev, (u32) &pru_suart_tx_priv->buff_addr,
> + (0x0090 + (i * 0x050)));
> +
> + /* Channel 1 is Rx context information */
> + pru_suart_regs++;
> + pruss_rmwl(dev, (u32) &pru_suart_regs->ch_ctrl_config1,
> + 0x3, SUART_CHN_RX);
> + pruss_rmwl(dev, (u32) &pru_suart_regs->ch_ctrl_config1,
> + (0xF << SERIALIZER_OFFSET),
> + ((0xF & uart_rx[i]) << SERIALIZER_OFFSET));
> + pruss_rmwl(dev, (u32) &pru_suart_regs->ch_ctrl_config1,
> + (0x3 << SUART_DEFAULT_OVRSMPL_OFFSET),
> + (SUART_DEFAULT_OVRSMPL <<
> + SUART_DEFAULT_OVRSMPL_OFFSET));
> + pruss_rmwl(dev,
> + (u32) &pru_suart_regs->ch_config2_txrx_status, 0xF, 8);
> +
> + if ((uart_config[i] & PRU_SUART_HALF_RX_DISABLED) ==
> + PRU_SUART_HALF_RX_DISABLED) {
> + pruss_rmwl(dev,
> + (u32) &pru_suart_regs->ch_config2_txrx_status,
> + (0x1 << SUART_CHN_OFFSET),
> + (SUART_CHN_DISABLED << SUART_CHN_OFFSET));
> + } else {
> + pruss_rmwl(dev,
> + (u32) &pru_suart_regs->ch_config2_txrx_status,
> + (0x1 << SUART_CHN_OFFSET),
> + (SUART_CHN_ENABLED << SUART_CHN_OFFSET));
> + iowrite32(MCASP_SRCTL_RX_MODE,
> + p_sr_ctl_addr + uart_rx[i]);
> + }
> + /*
> + * RX is active by default, write the dummy received data
> + * at PRU RAM addr 0x1FC to avoid memory corruption
> + */
> + pruss_rmwl(dev, (u32) &pru_suart_regs->ch_txrx_data,
> + 0xFFFF, RX_DEFAULT_DATA_DUMP_ADDR);
> + pruss_rmwl(dev, (u32) &pru_suart_regs->reserved1, 0xFFFF, 0);
> + /* SUART1 RX context base addr */
> + pru_suart_rx_priv = (struct pru_suart_rx_cntx_priv *)
> + (PRU0_DATARAM_OFFSET + (0x0C0 + (i * 0x50)));
> + pruss_writel(dev, (u32) &pru_suart_rx_priv->asp_rbuf_base,
> + (MCASP_RBUF_BASE_ADDR + (uart_rx[i] << 2)));
> + pruss_writel(dev, (u32) &pru_suart_rx_priv->asp_rsrctl_base,
> + (MCASP_SRCTL_BASE_ADDR + (uart_rx[i] << 2)));
> + }
> +}
> +#endif
> +
> +static void pru_set_rx_tx_mode(struct device *dev, u32 pru_mode, u32 
> pru_num)
> +{
> + u32 pru_offset;
> +
> + if (pru_num == PRUSS_NUM0)
> + pru_offset = PRU_SUART_PRU0_RX_TX_MODE;
> + else if (pru_num == PRUSS_NUM1)
> + pru_offset = PRU_SUART_PRU1_RX_TX_MODE;
> + else
> + return;
> + pruss_writeb(dev, pru_offset, (u8) pru_mode);
> +}
> +
> +static void pru_set_delay_count(struct device *dev, u32 pru_freq)
> +{
> + u32 delay_cnt;
> +
> + if (pru_freq == PRU_CLK_228)
> + delay_cnt = 5;
> + else if (pru_freq == PRU_CLK_186)
> + delay_cnt = 5;
> + else
> + delay_cnt = 3;
> +
> + /* PRU 0 */
> + pruss_writeb(dev, PRU_SUART_PRU0_DELAY_OFFSET,
> + (u8) delay_cnt);
> +
> + /* PRU 1 */
> + pruss_writeb(dev, PRU_SUART_PRU1_DELAY_OFFSET,
> + (u8) delay_cnt);
> +}
> +
> +static s32 suart_set_pru_id(struct device *dev, u32 pru_no)
> +{
> + u32 offset;
> + u8 reg_val = 0;
> +
> + if (PRUSS_NUM0 == pru_no)
> + offset = PRU_SUART_PRU0_ID_ADDR;
> + else if (PRUSS_NUM1 == pru_no)
> + offset = PRU_SUART_PRU1_ID_ADDR;
> + else
> + return -EINVAL;
> +
> + reg_val = pru_no;
> + pruss_writeb(dev, offset, reg_val);
> +
> + return 0;
> +}
> +
> +/*
> + * suart Initialization routine
> + */
> +s32 pru_softuart_init(struct device *dev,
> + struct pruss_suart_initparams *init_params,
> + const u8 *pru_suart_emu_code, u32 fw_size,
> + u32 clk_rate_pruss,
> + struct pruss_suart_iomap *pruss_ioaddr)
> +{
> + u32 datatowrite[128] = {0};
> + s16 status = 0;
> + s16 idx;
> + s16 retval;
> + u16 i;
> +
> + if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH) &&
> + (PRU1_MODE == PRU_MODE_RX_TX_BOTH))
> + return -EINVAL;
> +
> + suart_iomap.mcasp_io_addr = pruss_ioaddr->mcasp_io_addr;
> + suart_iomap.p_fifo_buff_phys_base =
> + pruss_ioaddr->p_fifo_buff_phys_base;
> + suart_iomap.p_fifo_buff_virt_base =
> + pruss_ioaddr->p_fifo_buff_virt_base;
> + /* Configure McASP0  */
> + suart_mcasp_config(init_params->tx_baud_value,
> + init_params->rx_baud_value,
> + init_params->oversampling, pruss_ioaddr);
> + pruss_enable(dev, PRUSS_NUM0);
> +
> + if (PRU1_MODE != PRU_MODE_INVALID)
> + pruss_enable(dev, PRUSS_NUM1);
> +
> + /* Reset PRU RAM */
> + for (i = 0; i < (PRU0_DATARAM_SIZE / sizeof(int)); i++)
> + pruss_writel(dev, (PRU0_DATARAM_OFFSET + (i * sizeof(int))),
> + datatowrite[i]);
> + if (PRU1_MODE != PRU_MODE_INVALID) {
> + for (i = 0; i < (PRU1_DATARAM_SIZE / sizeof(int)); i++)
> + pruss_writel(dev, (PRU1_DATARAM_OFFSET +
> + (i * sizeof(int))), datatowrite[i]);
> + }
> +
> + pruss_load(dev, PRUSS_NUM0, (u32 *)pru_suart_emu_code,
> + (fw_size / sizeof(u32)));
> + if (PRU1_MODE != PRU_MODE_INVALID)
> + pruss_load(dev, PRUSS_NUM1, (u32 *)pru_suart_emu_code,
> + (fw_size / sizeof(u32)));
> +
> + retval = arm_to_pru_intr_init(dev);
> + if (-1 == retval)
> + return status;
> + pru_set_delay_count(dev, clk_rate_pruss);
> + suart_set_pru_id(dev, PRUSS_NUM0);
> + if (PRU1_MODE != PRU_MODE_INVALID)
> + suart_set_pru_id(dev, PRUSS_NUM1);
> +
> + pru_set_rx_tx_mode(dev, PRU0_MODE, PRUSS_NUM0);
> + if (PRU1_MODE != PRU_MODE_INVALID)
> + pru_set_rx_tx_mode(dev, PRU1_MODE, PRUSS_NUM1);
> +
> + pru_set_ram_data(dev, pruss_ioaddr);
> + pruss_run(dev, PRUSS_NUM0);
> +
> + if (PRU1_MODE != PRU_MODE_INVALID)
> + pruss_run(dev, PRUSS_NUM1);
> +
> + /* Initialize uart_statu_table */
> + for (idx = 0; idx < 8; idx++)
> + uart_statu_table[idx] = ePRU_SUART_UART_FREE;
> +
> + return status;
> +}
> +
> +void pru_set_fifo_timeout(struct device *dev, s16 timeout)
> +{
> + pruss_writew(dev, PRU_SUART_PRU0_IDLE_TIMEOUT_OFFSET, (u16) timeout);
> + if (PRU1_MODE != PRU_MODE_INVALID)
> + pruss_writew(dev, PRU_SUART_PRU1_IDLE_TIMEOUT_OFFSET,
> + (u16) timeout);
> +}
> +
> +void pru_mcasp_deinit(void)
> +{
> + suart_mcasp_reset(&suart_iomap);
> +}
> +
> +/* suart Instance open routine  */
> +s32 pru_softuart_open(struct suart_handle *h_suart)
> +{
> + s16 status = 0;
> + u16 uart_num = h_suart->uart_num - 1;
> +
> + if (uart_statu_table[h_suart->uart_num - 1] ==
> + ePRU_SUART_UART_IN_USE) {
> + return -EUSERS;
> + } else {
> + h_suart->uart_type = uart_config[uart_num];
> + h_suart->uart_tx_channel = uart_tx[uart_num];
> + h_suart->uart_rx_channel = uart_rx[uart_num];
> + h_suart->uart_status = ePRU_SUART_UART_IN_USE;
> + uart_statu_table[h_suart->uart_num - 1] =
> + ePRU_SUART_UART_IN_USE;
> + }
> + return status;
> +}
> +
> +/* suart instance close routine */
> +s32 pru_softuart_close(struct suart_handle *h_uart)
> +{
> + s16 status = 0;
> +
> + if (h_uart == NULL) {
> + WARN_ON(1);
> + return -EINVAL;
> + } else {
> + uart_statu_table[h_uart->uart_num - 1] =
> + ePRU_SUART_UART_FREE;
> + /* Reset the Instance to Invalid */
> + h_uart->uart_num = PRU_SUART_UARTx_INVALID;
> + h_uart->uart_status = ePRU_SUART_UART_FREE;
> + }
> + return status;
> +}
> +
> +static s32 search_chnum(u16 uart_num, u16 *ch_num, u32 *pru_offset, u16 
> mode)
> +{
> + if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH)
> + || (PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
> + *ch_num = (uart_num * SUART_NUM_OF_CHANNELS_PER_SUART) - 2;
> + if (uart_num <= 4) {
> + *pru_offset = PRU_SUART_PRU0_CH0_OFFSET;
> + } else {
> + *pru_offset = PRU_SUART_PRU1_CH0_OFFSET;
> + *ch_num -= 8;
> + }
> + (mode == 2) ? ++*ch_num : *ch_num;
> + } else if (mode == 1) {
> + if (PRU0_MODE == PRU_MODE_TX_ONLY)
> + *pru_offset = PRU_SUART_PRU0_CH0_OFFSET;
> + else if (PRU1_MODE == PRU_MODE_TX_ONLY)
> + *pru_offset = PRU_SUART_PRU1_CH0_OFFSET;
> + } else if (mode == 2) {
> + if (PRU0_MODE == PRU_MODE_RX_ONLY)
> + *pru_offset = PRU_SUART_PRU0_CH0_OFFSET;
> + else if (PRU1_MODE == PRU_MODE_RX_ONLY)
> + *pru_offset = PRU_SUART_PRU1_CH0_OFFSET;
> + }
> + return 0;
> +}
> +
> +/*
> + * suart routine for setting relative baud rate
> + */
> +s32 pru_softuart_setbaud(struct device *dev, struct suart_handle *h_uart,
> + u16 tx_clk_divisor, u16 rx_clk_divisor)
> +{
> + u32 offset;
> + u32 pru_offset;
> + s16 status = 0;
> + u16 ch_num = h_uart->uart_num - 1;
> + u16 regval = 0;
> +
> + if (h_uart == NULL) {
> + WARN_ON(1);
> + return -EINVAL;
> + }
> +
> + /* Set the clock divisor value s32o the McASP */
> + if ((tx_clk_divisor > 385) || (tx_clk_divisor == 0))
> + return -EINVAL;
> + if ((rx_clk_divisor > 385) || (rx_clk_divisor == 0))
> + return -EINVAL;
> + search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 1);
> +
> + if (tx_clk_divisor != 0) {
> + offset = pru_offset +
> + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
> + PRU_SUART_CH_CONFIG1_OFFSET;
> + pruss_readw(dev, offset, (u16 *) &regval);
> + regval &= (~0x3FF);
> + regval |= tx_clk_divisor;
> + pruss_writew(dev, offset, regval);
> + }
> + if (PRU0_MODE == PRU_MODE_RX_ONLY) {
> + pru_offset = PRU_SUART_PRU0_CH0_OFFSET;
> + } else if (PRU1_MODE == PRU_MODE_RX_ONLY) {
> + pru_offset = PRU_SUART_PRU1_CH0_OFFSET;
> + } else if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH) ||
> + (PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
> + ch_num++;
> + } else {
> + return 0;
> + }
> + regval = 0;
> + if (rx_clk_divisor != 0) {
> + offset = pru_offset +
> + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
> + PRU_SUART_CH_CONFIG1_OFFSET;
> + pruss_readw(dev, offset, (u16 *) &regval);
> + regval &= (~0x3FF);
> + regval |= tx_clk_divisor;
> + pruss_writew(dev, offset, regval);
> + }
> + return status;
> +}
> +
> +/*
> + * suart routine for setting number of bits per character for a specific 
> uart
> + */
> +s32 pru_softuart_setdatabits(struct device *dev, struct suart_handle 
> *h_uart,
> + u16 tx_data_bits, u16 rx_data_bits)
> +{
> + u32 offset;
> + u32 pru_offset;
> + s16 status = 0;
> + u16 ch_num = h_uart->uart_num - 1;
> + u32 reg_val;
> +
> + if (h_uart == NULL) {
> + WARN_ON(1);
> + return -EINVAL;
> + }
> +
> + /*
> + * NOTE:
> + * The supported data bits are 6,7,8,9,10,11,12 bits per character
> + */
> +
> + if ((tx_data_bits < ePRU_SUART_DATA_BITS6)
> + || (tx_data_bits > ePRU_SUART_DATA_BITS12))
> + return -EINVAL;
> +
> + if ((rx_data_bits < ePRU_SUART_DATA_BITS6)
> + || (rx_data_bits > ePRU_SUART_DATA_BITS12))
> + return -EINVAL;
> + search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 1);
> +
> + if (tx_data_bits != 0) {
> + offset = pru_offset +
> + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
> + PRU_SUART_CH_CONFIG2_OFFSET;
> + pruss_readb(dev, offset, (u8 *) &reg_val);
> + reg_val &= ~(0xF);
> + reg_val |= tx_data_bits;
> + pruss_writeb(dev, offset, (u8) reg_val);
> + }
> + if (PRU0_MODE == PRU_MODE_RX_ONLY) {
> + pru_offset = PRU_SUART_PRU0_CH0_OFFSET;
> + } else if (PRU1_MODE == PRU_MODE_RX_ONLY) {
> + pru_offset = PRU_SUART_PRU1_CH0_OFFSET;
> + } else if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH)
> + || (PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
> + ch_num++;
> + } else {
> + return 0;
> + }
> + if (rx_data_bits != 0) {
> + offset = pru_offset +
> + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
> + PRU_SUART_CH_CONFIG2_OFFSET;
> + pruss_readb(dev, offset, (u8 *) &reg_val);
> + reg_val &= ~(0xF);
> + reg_val |= rx_data_bits;
> + pruss_writeb(dev, offset, (u8) rx_data_bits);
> + }
> +
> + return status;
> +}
> +
> +/*
> + * suart routine to configure specific uart
> + */
> +s32 pru_softuart_setconfig(struct device *dev, struct suart_handle 
> *h_uart,
> + struct suart_config *config_uart)
> +{
> + u32 offset;
> + u32 pru_offset;
> + s16 status = 0;
> + u16 ch_num = h_uart->uart_num - 1;
> + u16 reg_val = 0;
> +
> + if (h_uart == NULL) {
> + WARN_ON(1);
> + return -EINVAL;
> + }
> +
> + /*
> + * NOTE:
> + * Dependent baud rate for the given UART,the value MUST BE LESS THAN OR
> + * EQUAL TO 64, preScalarValue <= 64
> + */
> + if ((config_uart->tx_clk_divisor > 384)
> + || (config_uart->rx_clk_divisor > 384)) {
> + return -EINVAL;
> + }
> + if ((config_uart->tx_bits_per_char < 8)
> + || (config_uart->tx_bits_per_char > 14)) {
> + return -EINVAL;
> + }
> + if ((config_uart->rx_bits_per_char < 8)
> + || (config_uart->rx_bits_per_char > 14)) {
> + return -EINVAL;
> + }
> + search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 1);
> +
> + /*
> + * Configuring the Transmit part of the given UART
> + * Serializer has been as TX in mcasp config, by writing 1 in bits
> + * corresponding to tx serializer in PFUNC regsiter ie already set
> + * to GPIO mode PRU code will set then back to MCASP mode once TX
> + * request for that serializer is posted.It is required because at this
> + * pos32 Mcasp is accessed by both PRU and DSP have lower priority for
> + * Mcasp in comparison to PRU and DPS keeps on looping there only
> + *
> + * suart_mcasp_tx_serialzier_set
> + * (config_uart->tx_serializer, &suart_iomap);
> + */
> +
> + /* Configuring TX serializer  */
> + if (config_uart->tx_serializer != PRU_SUART_SERIALIZER_NONE) {
> + offset = pru_offset +
> + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
> + PRU_SUART_CH_CTRL_OFFSET;
> + pruss_readw(dev, offset, (u16 *) &reg_val);
> + reg_val = reg_val | (config_uart->tx_serializer <<
> + PRU_SUART_CH_CTRL_SR_SHIFT);
> + pruss_writew(dev, offset, reg_val);
> + offset = pru_offset +
> + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
> + PRU_SUART_CH_CONFIG1_OFFSET;
> + pruss_readw(dev, offset, (u16 *) &reg_val);
> + reg_val = reg_val | (config_uart->tx_clk_divisor <<
> + PRU_SUART_CH_CONFIG1_DIVISOR_SHIFT);
> + pruss_writew(dev, offset, reg_val);
> + offset = pru_offset +
> + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
> + PRU_SUART_CH_CONFIG2_OFFSET;
> + pruss_readw(dev, offset, (u16 *) &reg_val);
> + reg_val = reg_val | (config_uart->tx_bits_per_char <<
> + PRU_SUART_CH_CONFIG2_BITPERCHAR_SHIFT);
> + pruss_writew(dev, offset, reg_val);
> + }
> +
> + if (PRU0_MODE == PRU_MODE_RX_ONLY) {
> + pru_offset = PRU_SUART_PRU0_CH0_OFFSET;
> + } else if (PRU1_MODE == PRU_MODE_RX_ONLY) {
> + pru_offset = PRU_SUART_PRU1_CH0_OFFSET;
> + } else if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH) ||
> + (PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
> + ch_num++;
> + } else {
> + return 0;
> + }
> +
> + /* Configuring the Transmit part of the given UART */
> + if (config_uart->rx_serializer != PRU_SUART_SERIALIZER_NONE) {
> + /* Configuring RX serializer  */
> + offset = pru_offset +
> + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
> + PRU_SUART_CH_CTRL_OFFSET;
> + pruss_readw(dev, offset, (u16 *) &reg_val);
> + reg_val = reg_val | (config_uart->rx_serializer <<
> + PRU_SUART_CH_CTRL_SR_SHIFT);
> + pruss_writew(dev, offset, reg_val);
> +
> + /* Configuring RX prescalar value and Oversampling */
> + offset = pru_offset +
> + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
> + PRU_SUART_CH_CONFIG1_OFFSET;
> + pruss_readw(dev, offset, (u16 *) &reg_val);
> + reg_val = reg_val | (config_uart->rx_clk_divisor <<
> + PRU_SUART_CH_CONFIG1_DIVISOR_SHIFT) |
> + (config_uart->oversampling <<
> + PRU_SUART_CH_CONFIG1_OVS_SHIFT);
> + pruss_writew(dev, offset, reg_val);
> +
> + /* Configuring RX bits per character value */
> + offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL)
> + + PRU_SUART_CH_CONFIG2_OFFSET;
> + pruss_readw(dev, offset, (u16 *) &reg_val);
> + reg_val = reg_val | (config_uart->rx_bits_per_char <<
> + PRU_SUART_CH_CONFIG1_DIVISOR_SHIFT);
> + pruss_writew(dev, offset, reg_val);
> + }
> + return status;
> +}
> +
> +/*
> + * suart routine for getting the number of bytes transfered
> + */
> +s32 pru_softuart_get_tx_data_len(struct device *dev,
> + struct suart_handle *h_uart)
> +{
> + u32 offset;
> + u32 pru_offset;
> + u16 ch_num = h_uart->uart_num - 1;
> + u16 read_value = 0;
> +
> + if (h_uart == NULL) {
> + WARN_ON(1);
> + return -EINVAL;
> + }
> +
> + search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 1);
> +
> + offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
> + PRU_SUART_CH_CONFIG2_OFFSET;
> + pruss_readw(dev, offset, (u16 *) &read_value);
> + read_value = ((read_value & PRU_SUART_CH_CONFIG1_DIVISOR_MASK)
> + >> PRU_SUART_CH_CONFIG2_DATALEN_SHIFT);
> + return read_value;
> +}
> +
> +/*
> + * suart routine for getting the number of bytes received
> + */
> +s32 pru_softuart_get_rx_data_len(struct device *dev,
> + struct suart_handle *h_uart)
> +{
> + u32 offset;
> + u32 pru_offset;
> + u16 ch_num = h_uart->uart_num - 1;
> + u16 read_value = 0;
> +
> + if (h_uart == NULL) {
> + WARN_ON(1);
> + return -EINVAL;
> + }
> +
> + search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 2);
> +
> + offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
> + PRU_SUART_CH_CONFIG2_OFFSET;
> + pruss_readw(dev, offset, (u16 *) &read_value);
> + read_value = ((read_value & PRU_SUART_CH_CONFIG1_DIVISOR_MASK)
> + >> PRU_SUART_CH_CONFIG2_DATALEN_SHIFT);
> + return read_value;
> +}
> +
> +/*
> + * suart routine to get the configuration information from a specific 
> uart
> + */
> +s32 pru_softuart_getconfig(struct device *dev,
> + struct suart_handle *h_uart,
> + struct suart_config *config_uart)
> +{
> + u32 offset;
> + u32 pru_offset;
> + u16 ch_num = h_uart->uart_num - 1;
> + u16 reg_val = 0;
> + s16 status = 0;
> +
> + if (h_uart == NULL) {
> + WARN_ON(1);
> + return -EINVAL;
> + }
> +
> + /*
> + * NOTE:
> + * Dependent baud rate for the given UART,the value MUST BE LESS THAN OR
> + * EQUAL TO 64, preScalarValue <= 64
> + */
> + search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 1);
> +
> + /* Configuring the Transmit part of the given UART */
> + /* Configuring TX serializer  */
> + offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
> + PRU_SUART_CH_CTRL_OFFSET;
> + pruss_readw(dev, offset, (u16 *) &reg_val);
> + config_uart->tx_serializer = ((reg_val & PRU_SUART_CH_CTRL_SR_MASK) >>
> + PRU_SUART_CH_CTRL_SR_SHIFT);
> + /* Configuring TX prescalar value */
> + offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
> + PRU_SUART_CH_CONFIG1_OFFSET;
> + pruss_readw(dev, offset, (u16 *) &reg_val);
> + config_uart->tx_clk_divisor = ((reg_val &
> + PRU_SUART_CH_CONFIG1_DIVISOR_MASK) >>
> + PRU_SUART_CH_CONFIG1_DIVISOR_SHIFT);
> +
> + /* Configuring TX bits per character value */
> + offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
> + PRU_SUART_CH_CONFIG2_OFFSET;
> + pruss_readw(dev, offset, (u16 *) &reg_val);
> + config_uart->tx_bits_per_char = ((reg_val &
> + PRU_SUART_CH_CONFIG1_DIVISOR_MASK) >>
> + PRU_SUART_CH_CONFIG1_DIVISOR_SHIFT);
> +
> + if (PRU0_MODE == PRU_MODE_RX_ONLY) {
> + pru_offset = PRU_SUART_PRU0_CH0_OFFSET;
> + } else if (PRU1_MODE == PRU_MODE_RX_ONLY) {
> + pru_offset = PRU_SUART_PRU1_CH0_OFFSET;
> + } else if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH) ||
> + (PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
> + ch_num++;
> + } else {
> + return 0;
> + }
> + /* Configuring the Transmit part of the given UART */
> + /* Configuring RX serializer  */
> + offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
> + PRU_SUART_CH_CTRL_OFFSET;
> + pruss_readw(dev, offset, (u16 *) &reg_val);
> + config_uart->rx_serializer = ((reg_val & PRU_SUART_CH_CTRL_SR_MASK) >>
> + PRU_SUART_CH_CTRL_SR_SHIFT);
> +
> + /* Configuring RX prescalar value and oversampling */
> + offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
> + PRU_SUART_CH_CONFIG1_OFFSET;
> + pruss_readw(dev, offset, (u16 *) &reg_val);
> + config_uart->rx_clk_divisor = ((reg_val &
> + PRU_SUART_CH_CONFIG1_DIVISOR_MASK)
> + >> PRU_SUART_CH_CONFIG1_DIVISOR_SHIFT);
> + config_uart->oversampling = ((reg_val &
> + PRU_SUART_CH_CONFIG1_OVS_MASK) >>
> + PRU_SUART_CH_CONFIG1_OVS_SHIFT);
> +
> + /* Configuring RX bits per character value */
> + offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
> + PRU_SUART_CH_CONFIG2_OFFSET;
> + pruss_readw(dev, offset, (u16 *) &reg_val);
> + config_uart->rx_bits_per_char = ((reg_val &
> + PRU_SUART_CH_CONFIG1_DIVISOR_MASK)
> + >> PRU_SUART_CH_CONFIG1_DIVISOR_SHIFT);
> +
> + return status;
> +}
> +
> +s32 pru_softuart_pending_tx_request(struct device *dev)
> +{
> + u32 offset = 0;
> + u32 ISR_value = 0;
> +
> + if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH)
> +     || (PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
> + return 0;
> + } else if (PRU0_MODE == PRU_MODE_TX_ONLY) {
> + /* Read PRU Interrupt Status Register from PRU */
> + offset = (u32) (PRUSS_INTC_STATCLRINT1 & 0xFFFF);
> + pruss_readl(dev, offset, (u32 *)&ISR_value);
> + if ((ISR_value & 0x1) == 0x1)
> + return -EINVAL;
> + } else if (PRU1_MODE == PRU_MODE_TX_ONLY) {
> + /* Read PRU Interrupt Status Register from PRU */
> + offset = (u32) (PRUSS_INTC_STATCLRINT1 & 0xFFFF);
> + pruss_readl(dev, offset, (u32 *)&ISR_value);
> + if ((ISR_value & 0x2) == 0x2)
> + return -EINVAL;
> + } else {
> + return 0;
> + }
> +
> + return 0;
> +}
> +
> +/*
> + * suart data transmit routine
> + */
> +s32 pru_softuart_write(struct device *dev, struct suart_handle *h_uart,
> + u32 *pt_tx_data_buf, u16 data_len)
> +{
> + u32 offset = 0;
> + u32 pru_offset;
> + s16 status = 0;
> + u16 ch_num = h_uart->uart_num - 1;
> + u16 reg_val = 0;
> + u16 pru_num;
> +
> + if (h_uart == NULL) {
> + WARN_ON(1);
> + return -EINVAL;
> + }
> + search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 1);
> + if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH) ||
> + (PRU1_MODE == PRU_MODE_RX_TX_BOTH))
> + pru_num = h_uart->uart_num;
> + else if (PRU0_MODE == PRU_MODE_TX_ONLY)
> + pru_num = 0;
> + else if (PRU1_MODE == PRU_MODE_TX_ONLY)
> + pru_num = 1;
> + else
> + return 0;
> +
> + /* Writing data length to SUART channel register */
> + offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
> + PRU_SUART_CH_CONFIG2_OFFSET;
> + pruss_readw(dev, offset, (u16 *) &reg_val);
> + reg_val &= ~PRU_SUART_CH_CONFIG2_DATALEN_MASK;
> + reg_val = reg_val | (data_len << PRU_SUART_CH_CONFIG2_DATALEN_SHIFT);
> + pruss_writew(dev, offset, reg_val);
> +
> + /* Writing the data pos32er to channel TX data pointer */
> + offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
> + PRU_SUART_CH_TXRXDATA_OFFSET;
> + pruss_writel(dev, offset, (u32) *pt_tx_data_buf);
> +
> + /* Service Request to PRU */
> + offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
> + PRU_SUART_CH_CTRL_OFFSET;
> + pruss_readw(dev, offset, (u16 *) &reg_val);
> + reg_val &= ~(PRU_SUART_CH_CTRL_MODE_MASK |
> + PRU_SUART_CH_CTRL_SREQ_MASK);
> + reg_val |= (PRU_SUART_CH_CTRL_TX_MODE <<
> + PRU_SUART_CH_CTRL_MODE_SHIFT) | (PRU_SUART_CH_CTRL_SREQ <<
> + PRU_SUART_CH_CTRL_SREQ_SHIFT);
> + pruss_writew(dev, offset, reg_val);
> +
> + /* generate ARM->PRU event */
> + suart_arm_to_pru_intr(dev, pru_num);
> +
> + return status;
> +}
> +
> +/*
> + * suart data receive routine
> + */
> +s32 pru_softuart_read(struct device *dev, struct suart_handle *h_uart,
> + u32 *ptDataBuf, u16 data_len)
> +{
> + u32 offset = 0;
> + u32 pru_offset;
> + s16 status = 0;
> + u16 ch_num = h_uart->uart_num - 1;
> + u16 reg_val = 0;
> + u16 pru_num;
> +
> + if (h_uart == NULL) {
> + WARN_ON(1);
> + return -EINVAL;
> + }
> + search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 2);
> + if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH) ||
> + (PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
> + /* channel starts from 0 and uart instance starts from 1 */
> + ch_num = (h_uart->uart_num *
> + SUART_NUM_OF_CHANNELS_PER_SUART) - 2;
> + pru_num = h_uart->uart_num;
> + } else if (PRU0_MODE == PRU_MODE_RX_ONLY) {
> + pru_num = 0;
> + } else if (PRU1_MODE == PRU_MODE_RX_ONLY) {
> + pru_num = 1;
> + } else {
> + return 0;
> + }
> + /* Writing data length to SUART channel register */
> + offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
> + PRU_SUART_CH_CONFIG2_OFFSET;
> + pruss_readw(dev, offset, (u16 *) &reg_val);
> + reg_val &= ~PRU_SUART_CH_CONFIG2_DATALEN_MASK;
> + reg_val = reg_val | (data_len << PRU_SUART_CH_CONFIG2_DATALEN_SHIFT);
> + pruss_writew(dev, offset, reg_val);
> +
> + /* Writing the data pos32er to channel RX data pointer */
> + offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
> + PRU_SUART_CH_TXRXDATA_OFFSET;
> + pruss_writel(dev, offset, (u32) *ptDataBuf);
> +
> + /* Service Request to PRU */
> + offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
> + PRU_SUART_CH_CTRL_OFFSET;
> + pruss_readw(dev, offset, (u16 *) &reg_val);
> + reg_val &= ~(PRU_SUART_CH_CTRL_MODE_MASK |
> + PRU_SUART_CH_CTRL_SREQ_MASK);
> + reg_val |= (PRU_SUART_CH_CTRL_RX_MODE <<
> + PRU_SUART_CH_CTRL_MODE_SHIFT) | (PRU_SUART_CH_CTRL_SREQ <<
> + PRU_SUART_CH_CTRL_SREQ_SHIFT);
> + pruss_writew(dev, offset, reg_val);
> +
> + /* enable the timeout s32errupt */
> + suart_intr_setmask(dev, h_uart->uart_num, PRU_RX_INTR,
> + CHN_TXRX_IE_MASK_TIMEOUT);
> +
> + /* generate ARM->PRU event */
> + suart_arm_to_pru_intr(dev, pru_num);
> +
> + return status;
> +}
> +
> +/*
> + * suart routine to read the data from the RX FIFO
> + */
> +s32 pru_softuart_read_data(struct device *dev, struct suart_handle 
> *h_uart,
> + u8 *p_data_buffer, s32 max_len,
> + u32 *pdata_read)
> +{
> + s16 ret_val = 0;
> + u8 *psrc_addr = NULL;
> + u32 data_read = 0;
> + u32 data_len = 0;
> + u32 char_len = 0;
> + u32 offset = 0;
> + u32 pru_offset;
> + u16 ch_num = h_uart->uart_num - 1;
> + u16 status = 0;
> +
> + if (h_uart == NULL) {
> + WARN_ON(1);
> + return -EINVAL;
> + }
> + search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 2);
> +
> + /* Get the data pos32er from channel RX data pointer */
> + offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
> + PRU_SUART_CH_TXRXDATA_OFFSET;
> + pruss_readb_multi(dev, offset, (u8 *) &psrc_addr, 4);
> +
> + /* Reading data length from SUART channel register */
> + offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
> + PRU_SUART_CH_CONFIG2_OFFSET;
> + pruss_readw(dev, offset, (u16 *) &data_len);
> +
> + /* read the character length */
> + char_len = data_len & PRU_SUART_CH_CONFIG2_BITPERCHAR_MASK;
> + char_len -= 2; /* remove the START & STOP bit */
> +
> + data_len &= PRU_SUART_CH_CONFIG2_DATALEN_MASK;
> + data_len = data_len >> PRU_SUART_CH_CONFIG2_DATALEN_SHIFT;
> + data_len++;
> +
> + /* if the character length is greater than 8, then the size doubles */
> + if (char_len > 8)
> + data_len *= 2;
> +
> + /* Check if the time-out had occured. If, yes, then we need to find the
> + * number of bytes read from PRU. Else, we need to
> + * read the requested bytes
> + */
> + offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
> + PRU_SUART_CH_TXRXSTATUS_OFFSET;
> + pruss_readb(dev, offset, (u8 *) &status);
> + if (CHN_TXRX_STATUS_TIMEOUT == (status & CHN_TXRX_STATUS_TIMEOUT)) {
> + /* determine the number of bytes read s32o the FIFO */
> + offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL)
> + + PRU_SUART_CH_BYTESDONECNTR_OFFSET;
> + pruss_readb(dev, offset, (u8 *) &data_read);
> +
> + /* if the character length is greater than 8,
> + then the size doubles */
> + if (char_len > 8)
> + data_read *= 2;
> +
> +/*
> + * the data corresponding is loaded in second
> + * half during the timeout
> + */
> + if (data_read > data_len) {
> + data_read -= data_len;
> + psrc_addr += data_len;
> + }
> +
> + pru_softuart_clr_rx_fifo(dev, h_uart);
> + } else {
> + data_read = data_len;
> +/*
> + * if the bit is set, the data is in the first
> + * half of the FIFO else the data is in the second half
> + */
> + /* Determine the buffer index by reading FIFO_OddEven flag*/
> + if (status & CHN_TXRX_STATUS_CMPLT)
> + psrc_addr += data_len;
> + }
> +
> + /* we should be copying only max len given by the application */
> + if (data_read > max_len)
> + data_read = max_len;
> +
> +/* evaluate the virtual address of the FIFO address
> + * based on the physical addr
> + */
> + psrc_addr = (u8 *)((u32) psrc_addr -
> + (u32) suart_iomap.p_fifo_buff_phys_base +
> + (u32) suart_iomap.p_fifo_buff_virt_base);
> +
> + /* Now we have both the data length and the source address. copy */
> + for (offset = 0; offset < data_read; offset++)
> + *p_data_buffer++ = *psrc_addr++;
> + *pdata_read = data_read;
> + ret_val = 0;
> +
> + return ret_val;
> +}
> +
> +/*
> + * suart routine to disable the receive functionality.
> + * This routine stops the PRU from receiving on selected
> + * UART and also disables the McASP serializer corresponding
> + * to this UART Rx line.
> + */
> +s32 pru_softuart_stop_receive(struct device *dev, struct suart_handle 
> *h_uart)
> +{
> + u16 ret_status = 0;
> + u32 offset;
> + u32 pru_offset;
> + u16 ch_num = h_uart->uart_num - 1;
> + u16 status;
> +
> + if (h_uart == NULL) {
> + WARN_ON(1);
> + return -EINVAL;
> + }
> + search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 2);
> +
> + /* read the existing value of status flag */
> + offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
> + PRU_SUART_CH_TXRXSTATUS_OFFSET;
> + pruss_readb(dev, offset, (u8 *) &status);
> +
> + /* we need to clear the busy bit corresponding to receive channel */
> + status &= ~(CHN_TXRX_STATUS_RDY);
> + pruss_writeb(dev, offset, (u8) status);
> +
> + /* get the serizlizer number being used for this Rx channel */
> + offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
> + PRU_SUART_CH_CTRL_OFFSET;
> + pruss_readw(dev, offset, (u16 *) &status);
> + status &= PRU_SUART_CH_CTRL_SR_MASK;
> + status = status >> PRU_SUART_CH_CTRL_SR_SHIFT;
> +
> + /* we need to de-activate the serializer corresponding to this rx */
> + ret_status = suart_asp_serializer_deactivate(status, &suart_iomap);
> +
> + return ret_status;
> +}
> +
> +/*
> + * suart routine to get the tx status for a specific uart
> + */
> +s32 pru_softuart_get_tx_status(struct device *dev, struct suart_handle 
> *h_uart)
> +{
> + u32 offset;
> + u32 pru_offset;
> + u16 status = 0;
> + u16 ch_num = h_uart->uart_num - 1;
> +
> + if (h_uart == NULL) {
> + WARN_ON(1);
> + return -EINVAL;
> + }
> + search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 1);
> + offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
> + PRU_SUART_CH_TXRXSTATUS_OFFSET;
> + pruss_readb(dev, offset, (u8 *) &status);
> + return status;
> +}
> +
> +s32 pru_softuart_clr_tx_status(struct device *dev, struct suart_handle 
> *h_uart)
> +{
> + u32 offset;
> + u32 pru_offset;
> + u16 status = 0;
> + u16 ch_num = h_uart->uart_num - 1;
> +
> + if (h_uart == NULL) {
> + WARN_ON(1);
> + return -EINVAL;
> + }
> + search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 1);
> +
> + offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
> + PRU_SUART_CH_TXRXSTATUS_OFFSET;
> + pruss_readb(dev, offset, (u8 *) &status);
> + status &= ~(0x2);
> + pruss_writeb(dev, offset, (u8) status);
> + return status;
> +}
> +
> +/*
> + * suart routine to get the rx status for a specific uart
> + */
> +s32 pru_softuart_get_rx_status(struct device *dev, struct suart_handle 
> *h_uart)
> +{
> + u32 offset;
> + u32 pru_offset;
> + u16 status = 0;
> + u16 ch_num = h_uart->uart_num - 1;
> +
> + if (h_uart == NULL) {
> + WARN_ON(1);
> + return -EINVAL;
> + }
> + search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 2);
> +
> + offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
> + PRU_SUART_CH_TXRXSTATUS_OFFSET;
> + pruss_readb(dev, offset, (u8 *) &status);
> + return status;
> +}
> +
> +static s32 pru_softuart_clr_rx_fifo(struct device *dev,
> + struct suart_handle *h_uart)
> +{
> + u32 offset;
> + u32 pru_offset;
> + u16 status = 0;
> + u16 ch_num = h_uart->uart_num - 1;
> + u16 reg_val;
> + u16 uart_num;
> +
> + if (h_uart == NULL) {
> + WARN_ON(1);
> + return -EINVAL;
> + }
> + uart_num = h_uart->uart_num;
> + search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 2);
> + if (PRU0_MODE == PRU_MODE_RX_ONLY)
> + uart_num = 0;
> + else if (PRU1_MODE == PRU_MODE_RX_ONLY)
> + uart_num = 1;
> +
> + /* Reset the number of bytes read into the FIFO */
> + offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL)
> + + PRU_SUART_CH_BYTESDONECNTR_OFFSET;
> + pruss_readw(dev, offset, (u16 *) &reg_val);
> + reg_val &= 0x00;
> + pruss_writew(dev, offset, reg_val);
> +
> +
> + /* Service Request to PRU */
> + offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
> + PRU_SUART_CH_CTRL_OFFSET;
> + pruss_readw(dev, offset, (u16 *) &reg_val);
> + reg_val &= ~(PRU_SUART_CH_CTRL_MODE_MASK | PRU_SUART_CH_CTRL_SREQ_MASK);
> + reg_val |= (PRU_SUART_CH_CTRL_RX_MODE << PRU_SUART_CH_CTRL_MODE_SHIFT) |
> + (PRU_SUART_CH_CTRL_SREQ << PRU_SUART_CH_CTRL_SREQ_SHIFT);
> + pruss_writew(dev, offset, reg_val);
> + suart_intr_setmask(dev, h_uart->uart_num, PRU_RX_INTR,
> + CHN_TXRX_IE_MASK_TIMEOUT);
> +
> + /* generate ARM->PRU event */
> + suart_arm_to_pru_intr(dev, uart_num);
> +
> + return status;
> +}
> +
> +s32 pru_softuart_clr_rx_status(struct device *dev, struct suart_handle 
> *h_uart)
> +{
> + u32 offset;
> + u32 pru_offset;
> + u16 status = 0;
> + u16 ch_num = h_uart->uart_num - 1;
> +
> + if (h_uart == NULL) {
> + WARN_ON(1);
> + return -EINVAL;
> + }
> + search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 2);
> +
> + offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
> + PRU_SUART_CH_TXRXSTATUS_OFFSET;
> + pruss_readb(dev, offset, (u8 *) &status);
> + status &= ~(0x3C);
> + pruss_writeb(dev, offset, (u8) status);
> + return status;
> +}
> +
> +/*
> + * suart_s32r_status_read: Gets the Global Interrupt status register
> + * for the specified SUART.
> + * uart_num < 1 to 6 >
> + * txrx_flag < Indicates TX or RX s32errupt for the uart >
> + */
> +s32 pru_softuart_get_isrstatus(struct device *dev, u16 uart_num, u16 
> *txrx_flag)
> +{
> + u32 intc_offset;
> + u32 ch_num = 0xFF;
> + u32 reg_val = 0;
> + u32 reg_val2 = 0;
> + u32 ISR_value = 0;
> + u32 ack_reg_val = 0;
> + u32 stat_inx_clr_regoffset = 0;
> +
> + /* initialize the status & Flag to known value */
> + *txrx_flag = 0;
> +
> + stat_inx_clr_regoffset = (u32) (PRUSS_INTC_STATIDXCLR & 0xFFFF);
> +
> + /* Read PRU Interrupt Status Register from PRU */
> + intc_offset = (u32) (PRUSS_INTC_STATCLRINT1 & 0xFFFF);
> +
> + pruss_readl(dev, intc_offset, (u32 *)&ISR_value);
> + if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH)
> + || (PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
> + /* Check if the interrupt occured for Tx */
> + ch_num = uart_num * 2 - 2;
> + reg_val2 = PRU_SUART0_TX_EVT_BIT << ((uart_num - 1) * 2);
> + if (ISR_value & reg_val2) {
> + /* interupt occured for TX */
> + *txrx_flag |= PRU_TX_INTR;
> + /* acknowledge the RX interrupt  */
> + ack_reg_val  = ch_num + PRU_SUART0_TX_EVT;
> + pruss_writel(dev, stat_inx_clr_regoffset,
> + ack_reg_val);
> + }
> +
> + /* Check if the interrupt occured for Rx */
> + reg_val2 = PRU_SUART0_RX_EVT_BIT << ((uart_num - 1) * 2);
> + pruss_readl(dev, intc_offset, (u32 *)&ISR_value);
> + if (ISR_value & reg_val2) {
> + /* interupt occured for RX */
> + *txrx_flag |= PRU_RX_INTR;
> + ch_num += 1;
> +
> + /* acknowledge the RX interrupt  */
> + ack_reg_val  = ch_num + PRU_SUART0_TX_EVT;
> + pruss_writel(dev, stat_inx_clr_regoffset,
> + ack_reg_val);
> + }
> + } else {
> + ch_num = uart_num - 1;
> + if ((ISR_value & 0x03FC) != 0) {
> + reg_val2 = 1 << (uart_num + 1);
> + if (ISR_value & reg_val2) {
> + /* acknowledge the s32errupt  */
> + ack_reg_val = ch_num + PRU_SUART0_TX_EVT;
> + pruss_writel(dev, stat_inx_clr_regoffset,
> + ack_reg_val);
> + *txrx_flag |= PRU_RX_INTR;
> + }
> + }
> + pruss_readl(dev, intc_offset, (u32 *)&ISR_value);
> + if (ISR_value & 0x3FC00) {
> + reg_val2 = 1 << (uart_num + 9);
> + if (ISR_value & reg_val2) {
> + /* acknowledge the s32errupt  */
> + ack_reg_val = ch_num + PRU_SUART4_TX_EVT;
> + pruss_writel(dev, stat_inx_clr_regoffset,
> + ack_reg_val);
> + *txrx_flag |= PRU_TX_INTR;
> + }
> + }
> + }
> + return reg_val;
> +}
> +
> +s32 pru_intr_clr_isrstatus(struct device *dev, u16 uart_num, u32 
> txrxmode)
> +{
> + u32 offset;
> + u16 txrx_flag = 0;
> + u16 chn_num;
> +
> + chn_num = uart_num - 1;
> + if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH)
> +     || (PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
> + /* channel starts from 0 and uart instance starts from 1 */
> + chn_num = (uart_num * SUART_NUM_OF_CHANNELS_PER_SUART) - 2;
> + if (uart_num <= 4) {
> + /* PRU0 */
> + offset = PRU_SUART_PRU0_ISR_OFFSET + 1;
> + } else {
> + /* PRU1 */
> + offset = PRU_SUART_PRU1_ISR_OFFSET + 1;
> + /* First 8 channel corresponds to PRU0 */
> + chn_num -= 8;
> + }
> + if (2 == txrxmode)
> + chn_num++;
> + } else if (PRU0_MODE == txrxmode) {
> + offset = PRU_SUART_PRU0_ISR_OFFSET + 1;
> + } else if (PRU1_MODE == txrxmode) {
> + offset = PRU_SUART_PRU1_ISR_OFFSET + 1;
> + } else {
> + return 0;
> + }
> +
> + pruss_readb(dev, offset, (u8 *) &txrx_flag);
> + txrx_flag &= ~(0x2);
> + pruss_writeb(dev, offset, (u8) txrx_flag);
> +
> + return 0;
> +}
> +
> +s32 suart_arm_to_pru_intr(struct device *dev, u16 uart_num)
> +{
> + u32 value;
> +
> + if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH)
> +     || (PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
> + if ((uart_num > 0) && (uart_num <= 4))
> + value = 0x20; /* PRU0 SYS_EVT32 */
> + else if ((uart_num > 4) && (uart_num <= 8))
> + value = 0x21; /* PRU0 SYS_EVT33 */
> + else
> + return -EINVAL;
> + }
> + if ((PRU0_MODE == PRU_MODE_RX_ONLY)
> + || (PRU1_MODE == PRU_MODE_RX_ONLY)
> + || (PRU0_MODE == PRU_MODE_TX_ONLY)
> + || (PRU1_MODE == PRU_MODE_TX_ONLY)) {
> + if (uart_num == PRUSS_NUM0)
> + value = 0x20; /* PRU0 SYS_EVT32 */
> + else if (uart_num == PRUSS_NUM1)
> + value = 0x21; /* PRU0 SYS_EVT33 */
> + else
> + return -EINVAL;
> + }
> + return pruss_writel(dev, PRUSS_INTC_STATIDXSET, value);
> +}
> +
> +static s32 arm_to_pru_intr_init(struct device *dev)
> +{
> + u32 value;
> + u32 int_offset;
> +
> + /* Clear all the host interrupts */
> + for (int_offset = 0; int_offset <= PRUSS_INTC_HOSTINTLVL_MAX;
> + int_offset++)
> + pruss_idx_writel(dev, PRUSS_INTC_HSTINTENIDXCLR, int_offset);
> +
> + /* Enable the global s32errupt */
> + pruss_rmwl(dev, (u32) (PRUSS_INTC_GLBLEN & 0xFFFF), 0, 1);
> +
> + /* Enable the Host interrupts for all host channels */
> + for (int_offset = 0; int_offset <= PRUSS_INTC_HOSTINTLVL_MAX;
> + int_offset++)
> + pruss_rmwl(dev, (u32) (PRUSS_INTC_HSTINTENIDXSET & 0xFFFF),
> + 0, int_offset);
> + pruss_rmwl(dev, (u32) (PRUSS_INTC_HOSTMAP0 & 0xFFFF),
> + PRU_INTC_REGMAP_MASK, PRU_INTC_HOSTMAP0_CHAN);
> + pruss_rmwl(dev, (u32) (PRUSS_INTC_HOSTMAP1 & 0xFFFF),
> + PRU_INTC_REGMAP_MASK, PRU_INTC_HOSTMAP1_CHAN);
> + pruss_rmwl(dev, (u32) (PRUSS_INTC_HOSTMAP2 & 0xFFFF),
> + PRU_INTC_REGMAP_MASK, PRU_INTC_HOSTMAP2_CHAN);
> +
> + /* MAP Channel 0 to SYS_EVT31 */
> + pruss_rmwl(dev, (u32) (PRUSS_INTC_CHANMAP7 & 0xFFFF),
> + PRU_INTC_REGMAP_MASK, PRU_INTC_CHANMAP7_SYS_EVT31);
> +
> + if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH)
> +     || (PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
> + /* Sets the channels for the system interrupt */
> + pruss_rmwl(dev, (u32) (PRUSS_INTC_CHANMAP8 & 0xFFFF),
> + PRU_INTC_REGMAP_MASK, PRU_INTC_CHANMAP8_FULL);
> + pruss_rmwl(dev, (u32) (PRUSS_INTC_CHANMAP9 & 0xFFFF),
> + PRU_INTC_REGMAP_MASK, PRU_INTC_CHANMAP9_FULL);
> + pruss_rmwl(dev, (u32) (PRUSS_INTC_CHANMAP10 & 0xFFFF),
> + PRU_INTC_REGMAP_MASK, PRU_INTC_CHANMAP10_FULL);
> + pruss_rmwl(dev, (u32) (PRUSS_INTC_CHANMAP11 & 0xFFFF),
> + PRU_INTC_REGMAP_MASK, PRU_INTC_CHANMAP11_FULL);
> + pruss_rmwl(dev, (u32) (PRUSS_INTC_CHANMAP12 & 0xFFFF),
> + PRU_INTC_REGMAP_MASK, PRU_INTC_CHANMAP12_FULL);
> + }
> + if ((PRU0_MODE == PRU_MODE_RX_ONLY)
> + || (PRU1_MODE == PRU_MODE_RX_ONLY)
> + || (PRU0_MODE == PRU_MODE_TX_ONLY)
> + || (PRU1_MODE == PRU_MODE_TX_ONLY)) {
> +
> + /* Sets the channels for the system interrupt */
> + pruss_rmwl(dev, (u32) (PRUSS_INTC_CHANMAP8 & 0xFFFF),
> + PRU_INTC_REGMAP_MASK, PRU_INTC_CHANMAP8_HALF);
> + pruss_rmwl(dev, (u32) (PRUSS_INTC_CHANMAP9 & 0xFFFF),
> + PRU_INTC_REGMAP_MASK, PRU_INTC_CHANMAP9_HALF);
> + pruss_rmwl(dev, (u32) (PRUSS_INTC_CHANMAP10 & 0xFFFF),
> + PRU_INTC_REGMAP_MASK, PRU_INTC_CHANMAP10_HALF);
> + pruss_rmwl(dev, (u32) (PRUSS_INTC_CHANMAP11 & 0xFFFF),
> + PRU_INTC_REGMAP_MASK, PRU_INTC_CHANMAP11_HALF);
> + pruss_rmwl(dev, (u32) (PRUSS_INTC_CHANMAP12 & 0xFFFF),
> + PRU_INTC_REGMAP_MASK, PRU_INTC_CHANMAP12_HALF);
> + }
> +
> + /* Clear required set of system events
> + * and enable them using indexed register
> + */
> + for (int_offset = 0; int_offset < 18; int_offset++) {
> + value = 32 + int_offset;
> + pruss_idx_writel(dev, PRUSS_INTC_STATIDXCLR, value);
> + }
> +
> + /* enable only the HOST to PRU interrupts and let the PRU to Host events
> + * enabled by the separate API on demand basis.
> + */
> + pruss_idx_writel(dev, PRUSS_INTC_ENIDXSET, 31);
> + pruss_idx_writel(dev, PRUSS_INTC_ENIDXSET, 32);
> + pruss_idx_writel(dev, PRUSS_INTC_ENIDXSET, 33);
> + pruss_idx_writel(dev, PRUSS_INTC_ENIDXSET, 50);
> + pruss_rmwl(dev, (u32) (PRUSS_INTC_GLBLEN & 0xFFFF), 0, 1);
> +
> + /* Enable the Host interrupts for all host channels */
> + for (int_offset = 0; int_offset <= PRUSS_INTC_HOSTINTLVL_MAX;
> + int_offset++)
> + pruss_idx_writel(dev, PRUSS_INTC_HSTINTENIDXSET, int_offset);
> +
> + return 0;
> +}
> +
> +s32 suart_pru_to_host_intr_enable(struct device *dev, u16 uart_num,
> + u32 txrxmode, s32 flag)
> +{
> + u32 chn_num;
> + u32 value;
> + s16 retval = 0;
> +
> + if (uart_num > 8)
> + return -EINVAL;
> +
> + chn_num = uart_num - 1;
> + if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH) ||
> + (PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
> + chn_num = (uart_num * 2) - 2;
> + if (2 == txrxmode) /* Rx mode */
> + chn_num++;
> + value = 34 + chn_num;
> + } else if ((PRU_MODE_RX_ONLY == txrxmode)
> + && (PRU0_MODE == PRU_MODE_RX_ONLY))
> + value = 34 + chn_num;
> + else if ((PRU_MODE_RX_ONLY == txrxmode)
> + && (PRU1_MODE == PRU_MODE_RX_ONLY))
> + value = 42 + chn_num;
> + else if ((PRU_MODE_TX_ONLY == txrxmode)
> + && (PRU0_MODE == PRU_MODE_TX_ONLY))
> + value = 34 + chn_num;
> + else if ((PRU_MODE_TX_ONLY == txrxmode)
> + && (PRU1_MODE == PRU_MODE_TX_ONLY))
> + value = 42 + chn_num;
> + else
> + return -EINVAL;
> +
> + retval = flag ? pruss_idx_writel(dev, PRUSS_INTC_ENIDXSET, value) :
> + pruss_idx_writel(dev, PRUSS_INTC_ENIDXCLR, value);
> + return retval;
> +}
> +
> +s32 suart_intr_setmask(struct device *dev, u16 uart_num,
> + u32 txrxmode, u32 rmask)
> +{
> + u32 offset;
> + u32 pru_offset;
> + u32 regval = 0;
> + u32 chn_num = uart_num - 1;
> +
> + if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH)
> +     || (PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
> + /* channel starts from 0 and uart instance starts from 1 */
> + chn_num = (uart_num * SUART_NUM_OF_CHANNELS_PER_SUART) - 2;
> +
> + if ((uart_num > 0) && (uart_num <= 4)) {
> + pru_offset = PRU_SUART_PRU0_CH0_OFFSET;
> + offset = PRU_SUART_PRU0_IMR_OFFSET;
> + } else if ((uart_num > 4) && (uart_num <= 8)) {
> + offset = PRU_SUART_PRU1_IMR_OFFSET;
> + pru_offset = PRU_SUART_PRU1_CH0_OFFSET;
> + chn_num -= 8;
> + } else {
> + return -EINVAL;
> + }
> + if (2 == txrxmode)
> + chn_num++;
> + } else if (PRU0_MODE == txrxmode) {
> + pru_offset = PRU_SUART_PRU0_CH0_OFFSET;
> + offset = PRU_SUART_PRU0_IMR_OFFSET;
> + } else if (PRU1_MODE == txrxmode) {
> + pru_offset = PRU_SUART_PRU1_CH0_OFFSET;
> + offset = PRU_SUART_PRU1_IMR_OFFSET;
> + } else
> + return 0;
> +
> + regval = 1 << chn_num;
> + if (CHN_TXRX_IE_MASK_CMPLT == (rmask & CHN_TXRX_IE_MASK_CMPLT))
> + pruss_rmww(dev, offset, regval, regval);
> +
> + if ((rmask & SUART_GBL_INTR_ERR_MASK) ==
> + SUART_GBL_INTR_ERR_MASK) {
> + regval = SUART_GBL_INTR_ERR_MASK;
> + pruss_rmww(dev, offset, regval, regval);
> + }
> +
> + offset = pru_offset +
> + (chn_num * SUART_NUM_OF_BYTES_PER_CHANNEL)
> + + PRU_SUART_CH_CONFIG1_OFFSET;
> + /* Framing Error Interrupt Masked */
> + if ((rmask & CHN_TXRX_IE_MASK_FE) == CHN_TXRX_IE_MASK_FE) {
> + regval = 0;
> + pruss_readw(dev, offset, (u16 *) &regval);
> + regval &= ~(CHN_TXRX_IE_MASK_FE);
> + regval |= CHN_TXRX_IE_MASK_FE;
> + pruss_writew(dev, offset, (u16) regval);
> + }
> +
> + /* Break Indicator Interrupt Masked */
> + if (CHN_TXRX_IE_MASK_BI == (rmask & CHN_TXRX_IE_MASK_BI)) {
> + regval = 0;
> + pruss_readw(dev, offset, (u16 *) &regval);
> + regval &= ~(CHN_TXRX_IE_MASK_BI);
> + regval |= CHN_TXRX_IE_MASK_BI;
> + pruss_writew(dev, offset, (u16) regval);
> + }
> +
> + /* Timeout error Interrupt Masked */
> + if (CHN_TXRX_IE_MASK_TIMEOUT ==
> + (rmask & CHN_TXRX_IE_MASK_TIMEOUT)) {
> + regval = 0;
> + pruss_readw(dev, offset, (u16 *) &regval);
> + regval &= ~(CHN_TXRX_IE_MASK_TIMEOUT);
> + regval |= CHN_TXRX_IE_MASK_TIMEOUT;
> + pruss_writew(dev, offset, (u16) regval);
> + }
> + return 0;
> +}
> +
> +s32 suart_intr_clrmask(struct device *dev, u16 uart_num,
> + u32 txrxmode, u32 rmask)
> +{
> + u32 offset;
> + u32 pru_offset;
> + u16 regval = 0;
> + u16 chn_num;
> +
> + chn_num = uart_num - 1;
> + if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH)
> +     || (PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
> + /* channel starts from 0 and uart instance starts from 1 */
> + chn_num = (uart_num * SUART_NUM_OF_CHANNELS_PER_SUART) - 2;
> + if ((uart_num > 0) && (uart_num <= 4)) {
> + pru_offset = PRU_SUART_PRU0_CH0_OFFSET;
> + offset = PRU_SUART_PRU0_IMR_OFFSET;
> + } else if ((uart_num > 4) && (uart_num <= 8)) {
> + /* PRU1 */
> + offset = PRU_SUART_PRU1_IMR_OFFSET;
> + pru_offset = PRU_SUART_PRU1_CH0_OFFSET;
> + /* First 8 channel corresponds to PRU0 */
> + chn_num -= 8;
> + } else
> + return -EINVAL;
> + if (2 == txrxmode)
> + chn_num++;
> + } else if (PRU0_MODE == txrxmode) {
> + pru_offset = PRU_SUART_PRU0_CH0_OFFSET;
> + offset = PRU_SUART_PRU0_IMR_OFFSET;
> + } else if (PRU1_MODE == txrxmode) {
> + pru_offset = PRU_SUART_PRU1_CH0_OFFSET;
> + offset = PRU_SUART_PRU1_IMR_OFFSET;
> + } else
> + return 0;
> +
> + regval = 1 << chn_num;
> + if (CHN_TXRX_IE_MASK_CMPLT == (rmask & CHN_TXRX_IE_MASK_CMPLT))
> + pruss_rmww(dev, offset, regval, 0);
> +
> + if ((rmask & SUART_GBL_INTR_ERR_MASK) == SUART_GBL_INTR_ERR_MASK)
> + pruss_rmww(dev, offset, SUART_GBL_INTR_ERR_MASK, 0);
> +
> + offset = pru_offset +
> + (chn_num * SUART_NUM_OF_BYTES_PER_CHANNEL)
> + + PRU_SUART_CH_CONFIG1_OFFSET;
> +
> + /* Framing Error Interrupt Masked */
> + if ((rmask & CHN_TXRX_IE_MASK_FE) == CHN_TXRX_IE_MASK_FE) {
> + regval = 0;
> + pruss_readw(dev, offset, (u16 *) &regval);
> + regval &= ~(CHN_TXRX_IE_MASK_FE);
> + pruss_writew(dev, offset, regval);
> + }
> +
> + /* Break Indicator Interrupt Masked */
> + if (CHN_TXRX_IE_MASK_BI == (rmask & CHN_TXRX_IE_MASK_BI)) {
> + regval = 0;
> + pruss_readw(dev, offset, (u16 *) &regval);
> + regval &= ~(CHN_TXRX_IE_MASK_BI);
> + pruss_writew(dev, offset, regval);
> + }
> +
> + /* Timeout error Interrupt Masked */
> + if (CHN_TXRX_IE_MASK_TIMEOUT ==
> + (rmask & CHN_TXRX_IE_MASK_TIMEOUT)) {
> + regval = 0;
> + pruss_readw(dev, offset, (u16 *) &regval);
> + regval &= ~(CHN_TXRX_IE_MASK_TIMEOUT);
> + pruss_writew(dev, offset, regval);
> + }
> + return 0;
> +}
> +
> +s32 suart_intr_getmask(struct device *dev, u16 uart_num,
> + u32 txrxmode, u32 rmask)
> +{
> + u16 chn_num;
> + u32 offset;
> + u16 txrx_flag;
> + u16 regval = 1;
> +
> + chn_num = uart_num - 1;
> + if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH)
> +     || (PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
> + /* channel starts from 0 and uart instance starts from 1 */
> + chn_num = (uart_num * SUART_NUM_OF_CHANNELS_PER_SUART) - 2;
> +
> + if ((uart_num > 0) && (uart_num <= 4)) {
> +
> + offset = PRU_SUART_PRU0_IMR_OFFSET;
> + } else if ((uart_num > 4) && (uart_num <= 8)) {
> + /* PRU1 */
> + offset = PRU_SUART_PRU1_IMR_OFFSET;
> + /* First 8 channel corresponds to PRU0 */
> + chn_num -= 8;
> + } else
> + return -EINVAL;
> +
> + if (2 == txrxmode)
> + chn_num++;
> +
> + } else if (PRU0_MODE == txrxmode)
> + offset = PRU_SUART_PRU0_IMR_OFFSET;
> + else if (PRU1_MODE == txrxmode)
> + offset = PRU_SUART_PRU1_IMR_OFFSET;
> + else
> + return 0;
> +
> + regval = regval << chn_num;
> + pruss_readw(dev, offset, (u16 *) &txrx_flag);
> + txrx_flag &= regval;
> +
> + if ((rmask && (txrx_flag == regval)) || (!rmask && !txrx_flag))
> + return 1;
> +
> + return 0;
> +}
> diff --git a/drivers/tty/serial/pruss_suart_utils.c 
> b/drivers/tty/serial/pruss_suart_utils.c
> new file mode 100644
> index 0000000..5ee340e
> --- /dev/null
> +++ b/drivers/tty/serial/pruss_suart_utils.c
> @@ -0,0 +1,393 @@
> +/*
> + * Copyright (C) 2010, 2011 Texas Instruments Incorporated
> + * Author: Jitendra Kumar <jitendra@mistralsolutions.com>
> + *
> + * This program is free software; you can redistribute it and/or modify 
> it
> + * under the terms of the GNU General Public License as  published by the
> + * Free Software Foundation version 2.
> + *
> + * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
> + * whether express or implied; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> + * General Public License for more details.
> + */
> +
> +
> +#include <linux/mfd/pruss.h>
> +#include "pruss_suart.h"
> +
> +#define SUART_TRX_DIV_CONF_SZ 4
> +
> +static s16 suart_mcasp_tx_baud_set(u32 tx_baud_value,
> + struct pruss_suart_iomap *pruss_ioaddr);
> +static s16 suart_mcasp_rx_baud_set(u32 rx_baud_value, u32 oversampling,
> + struct pruss_suart_iomap *pruss_ioaddr);
> +
> +/*
> + * Lookup table for TX baud rate
> + * The divisor value is calculated using the formula
> + *
> + * ACLKX = (AUXCLK)/(CLKXDIV * HCLKXDIV)
> + *
> + * Where
> + * CLKXDIV takes values from 1-32
> + * HCLKXDIV takes values from 1-4096
> + * Here
> + * AUXCLK = 24MHz
> + */
> +static u32 lt_tx_baud_rate[][SUART_TRX_DIV_CONF_SZ] = {
> + /*BaudRate, Divisor, CLKXDIV,HCLKXDIV */
> + {300, 80000, 24, 3200},
> + {600, 40000, 15, 2500},
> + {1800, 13333, 10, 1212},
> + {2400, 10000, 4, 2000},
> + {4800, 5000, 1, 2500},
> + {7200, 3333, 0, 3333},
> + {9600, 2500, 0, 2500},
> + {14400, 1666, 0, 1666},
> + {19200, 1250, 0, 1250},
> + {38400, 625, 0, 625},
> + {57600, 416, 0, 416},
> + {115200, 208, 0, 208},
> + {230400, 104, 0, 104}
> +};
> +
> +/*
> + * Lookup table for RX baud rate for 8 bit oversampling
> + * The divisor value is calculated using the formula
> + *
> + * ACLKR = (AUXCLK)/(CLKRDIV * HCLKRDIV) * Oversampling
> + *
> + * Where
> + * CLKRDIV takes values from 1-32
> + * HCLKRDIV takes values from 1-4096
> + * Here
> + * AUXCLK = 24MHz
> + */
> +static u32 lt_rx_8x_baud_rate[][SUART_TRX_DIV_CONF_SZ] = {
> +/* BaudRate, Divisor, CLKXDIV, HCLKXDIV */
> + {300, 10000, 4, 2000},
> + {600, 5000, 1, 2500},
> + {1800, 1667, 0, 1667},
> + {2400, 1250, 0, 1250},
> + {7200, 417, 0, 417},
> + {4800, 625, 0, 625},
> + {9600, 312, 0, 312},
> + {14400, 208, 0, 208},
> + {19200, 156, 0, 156},
> + {38400, 78, 0, 78},
> + {57600, 52, 0, 52},
> + {115200, 26, 0, 26},
> + {230400, 13, 0, 13}
> +};
> +
> +/*
> + * Lookup table for RX baud rate for 16 bit oversampling
> + * The divisor value is calculated using the formula
> + *
> + * ACLKR = (AUXCLK)/(CLKRDIV * HCLKRDIV) * Oversampling
> + *
> + * Where
> + * CLKRDIV takes values from 1-32
> + * HCLKRDIV takes values from 1-4096
> + * Here
> + * AUXCLK = 24MHz
> + */
> +static u32 lt_rx_16x_baud_rate[][SUART_TRX_DIV_CONF_SZ] = {
> +/*BaudRate, Divisor, CLKXDIV, HCLKXDIV */
> + {300, 5000, 1, 2500},
> + {600, 2500, 0, 2500},
> + {1800, 833, 0, 833},
> + {2400, 625, 0, 625},
> + {4800, 312, 0, 312},
> + {7200, 208, 0, 208},
> + {9600, 156, 0, 156},
> + {14400, 104, 0, 104},
> + {19200, 78, 0, 78},
> + {38400, 39, 0, 39},
> + {57600, 26, 0, 26},
> + {115200, 13, 0, 13},
> + {230400, 6, 0, 6}
> +};
> +
> +/*
> + * McASP configuration routine
> + */
> +
> +void suart_mcasp_reset(struct pruss_suart_iomap *pruss_ioaddr)
> +{
> + struct omapl_mcasp_regs_ovly __iomem *mcasp0_regs =
> + pruss_ioaddr->mcasp_io_addr;
> + /* reset mcasp. */
> + iowrite32(MCASP_SUART_GBLCTL, &mcasp0_regs->gblctl);
> + iowrite32(MCASP_SUART_RGBLCTL, &mcasp0_regs->rgblctl);
> + iowrite32(MCASP_SUART_XGBLCTL, &mcasp0_regs->xgblctl);
> + iowrite32(MCASP_SUART_XSTAT, &mcasp0_regs->xstat);
> + iowrite32(MCASP_SUART_RSTAT, &mcasp0_regs->rstat);
> +}
> +
> +void suart_mcasp_config(u32 tx_baud_value,
> + u32 rx_baud_value,
> + u32 oversampling,
> + struct pruss_suart_iomap *pruss_ioaddr)
> +{
> + struct omapl_mcasp_regs_ovly __iomem *mcasp0_regs =
> + pruss_ioaddr->mcasp_io_addr;
> + u32 temp_reg;
> +
> + /* reset mcasp */
> + iowrite32(MCASP_SUART_GBLCTL, &mcasp0_regs->gblctl);
> + iowrite32(MCASP_SUART_RGBLCTL, &mcasp0_regs->rgblctl);
> + iowrite32(MCASP_SUART_XGBLCTL, &mcasp0_regs->xgblctl);
> +
> + /* configure receive registers */
> + if ((SUART_8X_OVRSMPL == oversampling) || (0 == oversampling)) {
> + iowrite32(MCASP_SUART_RMASK_8, &mcasp0_regs->rmask);
> + iowrite32(MCASP_SUART_RFMT_8, &mcasp0_regs->rfmt);
> + }
> + if (SUART_16X_OVRSMPL == oversampling) {
> + iowrite32(MCASP_SUART_RMASK_16, &mcasp0_regs->rmask);
> + iowrite32(MCASP_SUART_RFMT_16, &mcasp0_regs->rfmt);
> +
> + }
> +
> + iowrite32(MCASP_SUART_FSRM, &mcasp0_regs->afsrctl);
> + iowrite32(MCASP_SUART_CLKRM_CLKRP, &mcasp0_regs->aclkrctl);
> + iowrite32(MCASP_SUART_HCLKRP, &mcasp0_regs->ahclkrctl);
> + suart_mcasp_rx_baud_set(rx_baud_value, oversampling, pruss_ioaddr);
> + iowrite32(MCASP_SUART_RTDMS0, &mcasp0_regs->rtdm);
> + iowrite32(MCASP_SUART_RSYNCERR, &mcasp0_regs->rintctl);
> + iowrite32(MCASP_SUART_RMAX_RPS_256, &mcasp0_regs->rclkchk);
> +
> + /* configure transmit registers. */
> + iowrite32(MCASP_SUART_XMASK_0_31, &mcasp0_regs->xmask);
> + iowrite32(MCASP_SUART_XBUSEL_XSSZ_16_XPAD_0, &mcasp0_regs->xfmt);
> + iowrite32(MCASP_SUART_FSXM, &mcasp0_regs->afsxctl);
> + iowrite32(MCASP_SUART_CLKXM_ASYNC_CLKXP, &mcasp0_regs->aclkxctl);
> + iowrite32(MCASP_SUART_HCLKXM, &mcasp0_regs->ahclkxctl);
> +
> + suart_mcasp_tx_baud_set(tx_baud_value, pruss_ioaddr);
> + iowrite32(MCASP_SUART_XTDMS0, &mcasp0_regs->xtdm);
> + iowrite32(MCASP_SUART_XSYNCERR, &mcasp0_regs->xintctl);
> + iowrite32(MCASP_SUART_XMAX_XPS_256, &mcasp0_regs->xclkchk);
> +
> + /* Serializer as a transmitter */
> + iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl0);
> + iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl1);
> + iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl2);
> + iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl3);
> + iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl4);
> + iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl5);
> + iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl6);
> + iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl7);
> + iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl8);
> + iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl9);
> + iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl10);
> + iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl11);
> + iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl12);
> + iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl13);
> + iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl14);
> + iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl15);
> +
> + /* Configure all AXR[n] as McASP pins  */
> +
> + /*
> + *  Setting  all TX MCASP AXR[n] Pin mapped to Even Serializer number
> + *  (0,2,4,6,8,10,12,14) to GPIO Mode by default. During setting the
> + *  serializer to TX mode in PRU assembly code, the MCASP AXR[n] Pin
> + *  would get configured to MCASP mode of operation,
> + *  before Actual Data Transfer
> + */
> +
> + /* Setting  all TX Pin to GPIO Mode by default */
> + temp_reg = (OMAPL_MCASP_PFUNC_RESETVAL) |
> +     (1 << PRU_SUART0_CONFIG_TX_SER) | (1 << PRU_SUART1_CONFIG_TX_SER) |
> +     (1 << PRU_SUART2_CONFIG_TX_SER) | (1 << PRU_SUART3_CONFIG_TX_SER) |
> +     (1 << PRU_SUART4_CONFIG_TX_SER) | (1 << PRU_SUART5_CONFIG_TX_SER) |
> +     (1 << PRU_SUART6_CONFIG_TX_SER) | (1 << PRU_SUART7_CONFIG_TX_SER);
> + iowrite32(temp_reg, &mcasp0_regs->pfunc);
> +
> + iowrite32(0xFFF, &mcasp0_regs->pdout);
> +
> + /* config pin function and direction */
> + iowrite32(0x00000000, &mcasp0_regs->pdir);
> + temp_reg =
> +     (1 << PRU_SUART0_CONFIG_TX_SER) | (1 << PRU_SUART1_CONFIG_TX_SER) |
> +     (1 << PRU_SUART2_CONFIG_TX_SER) | (1 << PRU_SUART3_CONFIG_TX_SER) |
> +     (1 << PRU_SUART4_CONFIG_TX_SER) | (1 << PRU_SUART5_CONFIG_TX_SER) |
> +     (1 << PRU_SUART6_CONFIG_TX_SER) | (1 << PRU_SUART7_CONFIG_TX_SER) |
> +     (MCASP_PDIR_VAL);
> + iowrite32(temp_reg, &mcasp0_regs->pdir);
> +
> + iowrite32(MCASP_SUART_DIT_DISABLE, &mcasp0_regs->ditctl);
> + iowrite32(MCASP_SUART_LOOPBACK_DISABLE, &mcasp0_regs->dlbctl);
> + iowrite32(MCASP_SUART_AMUTE_DISABLE, &mcasp0_regs->amute);
> +
> + iowrite32(MCASP_SUART_XSTAT, &mcasp0_regs->xstat);
> + iowrite32(MCASP_SUART_RSTAT, &mcasp0_regs->rstat);
> +}
> +
> +void suart_mcasp_tx_serialzier_set(u32 serializer_num,
> + struct pruss_suart_iomap *pruss_ioaddr)
> +{
> + struct omapl_mcasp_regs_ovly __iomem *mcasp0_regs =
> + pruss_ioaddr->mcasp_io_addr;
> + u32 temp_reg;
> + temp_reg = ioread32(&mcasp0_regs->pfunc);
> + temp_reg |= (0x1 << serializer_num);
> + iowrite32(temp_reg, &mcasp0_regs->pfunc);
> +}
> +
> +/*
> + * mcasp TX buard rate setting routine
> + */
> +static s16 suart_mcasp_tx_baud_set(u32 tx_baud_value,
> + struct pruss_suart_iomap *pruss_ioaddr)
> +{
> + u32 clk_div_val;
> + u32 loop_cnt;
> + s16 status = 0;
> + s16 found_val = false;
> +
> + struct omapl_mcasp_regs_ovly __iomem *mcasp0_regs =
> + pruss_ioaddr->mcasp_io_addr;
> + u32 temp_reg;
> +
> + /* Search the supported baud rate in the table */
> + for (loop_cnt = 0; loop_cnt < SUART_NUM_OF_BAUDS_SUPPORTED;
> + loop_cnt++) {
> + if (tx_baud_value == lt_tx_baud_rate[loop_cnt][0]) {
> + found_val = true;
> + break;
> + }
> + }
> + if (found_val == true) {
> + clk_div_val = lt_tx_baud_rate[loop_cnt][2];
> + temp_reg = ioread32(&mcasp0_regs->aclkxctl);
> + temp_reg |= (clk_div_val <<
> + OMAPL_MCASP_ACLKXCTL_CLKXDIV_SHIFT);
> + iowrite32(temp_reg, &mcasp0_regs->aclkxctl);
> + clk_div_val = lt_tx_baud_rate[loop_cnt][3];
> + temp_reg = ioread32(&mcasp0_regs->ahclkxctl);
> + temp_reg |= (clk_div_val <<
> + OMAPL_MCASP_AHCLKXCTL_HCLKXDIV_SHIFT);
> + iowrite32(temp_reg, &mcasp0_regs->ahclkxctl);
> + } else {
> + return -EINVAL ;
> + }
> + return status;
> +}
> +
> +/*
> + * mcasp RX buard rate setting routine
> + */
> +static s16 suart_mcasp_rx_baud_set(u32 rx_baud_value,
> + u32 oversampling, struct pruss_suart_iomap *pruss_ioaddr)
> +{
> + u32 clk_div_val = 0;
> + u32 loop_cnt = 0;
> + s16 status = 0;
> + u32 temp_reg = 0;
> + struct omapl_mcasp_regs_ovly __iomem *mcasp0_regs =
> + pruss_ioaddr->mcasp_io_addr;
> +
> + switch (oversampling) {
> + case SUART_8X_OVRSMPL:
> + for (loop_cnt = 0; loop_cnt < SUART_NUM_OF_BAUDS_SUPPORTED;
> +      loop_cnt++) {
> + if (rx_baud_value == lt_rx_8x_baud_rate[loop_cnt][0]) {
> + clk_div_val = lt_rx_8x_baud_rate[loop_cnt][2];
> + temp_reg = ioread32(&mcasp0_regs->aclkrctl);
> + temp_reg |= (clk_div_val <<
> + OMAPL_MCASP_ACLKXCTL_CLKXDIV_SHIFT);
> + iowrite32(temp_reg, &mcasp0_regs->aclkrctl);
> +
> + clk_div_val =
> + lt_rx_8x_baud_rate[loop_cnt][3] - 1;
> +
> + temp_reg = ioread32(&mcasp0_regs->ahclkrctl);
> + temp_reg |= (clk_div_val <<
> + OMAPL_MCASP_AHCLKXCTL_HCLKXDIV_SHIFT);
> + iowrite32(temp_reg, &mcasp0_regs->ahclkrctl);
> + break;
> + }
> + }
> + status = -EINVAL;
> + break;
> + case SUART_16X_OVRSMPL:
> + for (loop_cnt = 0; loop_cnt < SUART_NUM_OF_BAUDS_SUPPORTED;
> +      loop_cnt++) {
> + if (rx_baud_value == lt_rx_16x_baud_rate[loop_cnt][0]) {
> + clk_div_val = lt_rx_16x_baud_rate[loop_cnt][2];
> + temp_reg = ioread32(&mcasp0_regs->aclkrctl);
> + temp_reg |= (clk_div_val <<
> + OMAPL_MCASP_ACLKXCTL_CLKXDIV_SHIFT);
> + iowrite32(temp_reg, &mcasp0_regs->aclkrctl);
> + clk_div_val = lt_rx_16x_baud_rate[loop_cnt][3];
> + temp_reg = ioread32(&mcasp0_regs->ahclkrctl);
> + temp_reg |= (clk_div_val <<
> + OMAPL_MCASP_AHCLKXCTL_HCLKXDIV_SHIFT);
> + iowrite32(temp_reg, &mcasp0_regs->ahclkrctl);
> + break;
> + }
> + }
> + status = -EINVAL;
> + break;
> + case SUART_TX_OVRSMPL:
> + for (loop_cnt = 0; loop_cnt < SUART_NUM_OF_BAUDS_SUPPORTED;
> +      loop_cnt++) {
> + if (rx_baud_value == lt_tx_baud_rate[loop_cnt][0]) {
> + clk_div_val = lt_tx_baud_rate[loop_cnt][2];
> + temp_reg = ioread32(&mcasp0_regs->aclkrctl);
> + temp_reg |= (clk_div_val <<
> + OMAPL_MCASP_ACLKXCTL_CLKXDIV_SHIFT);
> + iowrite32(temp_reg, &mcasp0_regs->aclkrctl);
> + clk_div_val = lt_tx_baud_rate[loop_cnt][3];
> + temp_reg = ioread32(&mcasp0_regs->ahclkrctl);
> + temp_reg |= (clk_div_val <<
> + OMAPL_MCASP_AHCLKXCTL_HCLKXDIV_SHIFT);
> + iowrite32(temp_reg, &mcasp0_regs->ahclkrctl);
> + break;
> + }
> + }
> + status = -EINVAL;
> + break;
> + default:
> + status = -EINVAL;
> + break;
> + }
> +
> + return status;
> +}
> +
> +/*
> + * mcasp buard rate setting routine
> + */
> +s16 suart_asp_baud_set(u32 tx_baud_value, u32 rx_baud_value, u32 
> oversampling,
> + struct pruss_suart_iomap *pruss_ioaddr)
> +{
> + s16 status = 0;
> +
> + status = suart_mcasp_tx_baud_set(tx_baud_value, pruss_ioaddr);
> + status = suart_mcasp_rx_baud_set(rx_baud_value, oversampling,
> + pruss_ioaddr);
> +
> + return status;
> +}
> +
> +/*
> + * mcasp deactivate the selected serializer
> + */
> +s16 suart_asp_serializer_deactivate(u16 sr_num,
> + struct pruss_suart_iomap *pruss_ioaddr)
> +{
> + s16 status = 0;
> + struct omapl_mcasp_regs_ovly __iomem *mcasp0_regs =
> + pruss_ioaddr->mcasp_io_addr;
> + if (sr_num > 15)
> + status = -EINVAL;
> + else
> + iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl0);
> +
> + return status;
> +}
> diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
> index 758c5b0..eae37fe 100644
> --- a/include/linux/serial_core.h
> +++ b/include/linux/serial_core.h
> @@ -202,6 +202,8 @@
> /* VIA VT8500 SoC */
> #define PORT_VT8500 97
>
> +#define PORT_DA8XX_PRU_SUART 98
> +
> #ifdef __KERNEL__
>
> #include <linux/compiler.h>
> -- 
> 1.7.2.3
> 

[PATCH v4 08/11] tty: add pruss SUART driver

[Subhasish Ghosh]

Hi Greg,

I am observing a RX FIFO sized data loss problem with my driver.

I observed that if I start the TX before the RX, then there are no errors,
but, if I start a TX after a RX, then I observe the error (FIFO sized data 
chunks missing).

Say, for example, if I use all three UARTS and on all three I start RX, then 
for every TX started I would observe
one error on all the RX data buffer.

So, if I start only two TX, then I will see only two errors on all the three 
RX UARTS.

RE: [PATCH v4 08/11] tty: add pruss SUART driver

[Nori, Sekhar]

On Mon, May 02, 2011 at 14:04:11, Subhasish Ghosh wrote:

> >> SG - So, should I call the sram_alloc() in the platform setup function. 
> > 
> > Can you please shed some light on how SRAM
> > is being used in the driver? Looking at the
> > driver, it looks like it is used as a shared
> > buffer between the PRU firmware and kernel.
> > 
> > If yes, how do you cope with dynamic allocation
> > of SRAM? That is, how do you inform the firmware
> > what portion of SRAM has been allocated to the
> > driver?
> > 
> > Also, usage of SRAM is not required for basic driver
> > function, correct? So, a platform which does not
> > have SRAM to spare for this driver could still have
> > a portion of SDRAM/DDR allocated to be used as the
> > shared buffer? I guess SRAM was used only for lower
> > access times. But it should still be possible to
> > sustain lower baudrates with SDRAM/DDR?
> 
> The sram is allocated dynamically in the driver. 
> After allocation, we write the pointer into the PRU, so in case the
> driver allocates memory form the DDR, it will write this info into the
> PRU and it will work. But, because of DDR access latencies, the UART
> will work only for lower baud rates. 

Thanks for the clarification. In this case, the driver
should use platform callbacks to get/put fast fifo
space. In case this callback is not populated by the
platform or returns an error, the driver should fall
back to allocating from DDR.

Thanks,
Sekhar

[PATCH v4 08/11] tty: add pruss SUART driver

[Nori, Sekhar]

On Mon, May 02, 2011 at 14:04:11, Subhasish Ghosh wrote:

> >> SG - So, should I call the sram_alloc() in the platform setup function. 
> > 
> > Can you please shed some light on how SRAM
> > is being used in the driver? Looking at the
> > driver, it looks like it is used as a shared
> > buffer between the PRU firmware and kernel.
> > 
> > If yes, how do you cope with dynamic allocation
> > of SRAM? That is, how do you inform the firmware
> > what portion of SRAM has been allocated to the
> > driver?
> > 
> > Also, usage of SRAM is not required for basic driver
> > function, correct? So, a platform which does not
> > have SRAM to spare for this driver could still have
> > a portion of SDRAM/DDR allocated to be used as the
> > shared buffer? I guess SRAM was used only for lower
> > access times. But it should still be possible to
> > sustain lower baudrates with SDRAM/DDR?
> 
> The sram is allocated dynamically in the driver. 
> After allocation, we write the pointer into the PRU, so in case the
> driver allocates memory form the DDR, it will write this info into the
> PRU and it will work. But, because of DDR access latencies, the UART
> will work only for lower baud rates. 

Thanks for the clarification. In this case, the driver
should use platform callbacks to get/put fast fifo
space. In case this callback is not populated by the
platform or returns an error, the driver should fall
back to allocating from DDR.

Thanks,
Sekhar

Re: [PATCH v4 08/11] tty: add pruss SUART driver

[Subhasish Ghosh]

> Hi Subhasish,
> 
> On Wed, Apr 27, 2011 at 18:45:06, Subhasish Ghosh wrote:
>>  >> >>The driver should probably just get sram
>> >> >> space through platform data so that it doesn't depend on the
>> >> >> platform specific sram allocation function.
>> >>
>> >> Are you suggesting that I go back to that implementation.
>> >
>> > No, the platform code should use the SRAM allocator and
>> > pass on the allocated memory to the driver.
>> 
>> SG - So, should I call the sram_alloc() in the platform setup function. 
> 
> Can you please shed some light on how SRAM
> is being used in the driver? Looking at the
> driver, it looks like it is used as a shared
> buffer between the PRU firmware and kernel.
> 
> If yes, how do you cope with dynamic allocation
> of SRAM? That is, how do you inform the firmware
> what portion of SRAM has been allocated to the
> driver?
> 
> Also, usage of SRAM is not required for basic driver
> function, correct? So, a platform which does not
> have SRAM to spare for this driver could still have
> a portion of SDRAM/DDR allocated to be used as the
> shared buffer? I guess SRAM was used only for lower
> access times. But it should still be possible to
> sustain lower baudrates with SDRAM/DDR?

The sram is allocated dynamically in the driver. 
After allocation, we write the pointer into the PRU, so in case the
driver allocates memory form the DDR, it will write this info into the
PRU and it will work. But, because of DDR access latencies, the UART
will work only for lower baud rates. 

[PATCH v4 08/11] tty: add pruss SUART driver

[Subhasish Ghosh]

> Hi Subhasish,
> 
> On Wed, Apr 27, 2011 at 18:45:06, Subhasish Ghosh wrote:
>>  >> >>The driver should probably just get sram
>> >> >> space through platform data so that it doesn't depend on the
>> >> >> platform specific sram allocation function.
>> >>
>> >> Are you suggesting that I go back to that implementation.
>> >
>> > No, the platform code should use the SRAM allocator and
>> > pass on the allocated memory to the driver.
>> 
>> SG - So, should I call the sram_alloc() in the platform setup function. 
> 
> Can you please shed some light on how SRAM
> is being used in the driver? Looking at the
> driver, it looks like it is used as a shared
> buffer between the PRU firmware and kernel.
> 
> If yes, how do you cope with dynamic allocation
> of SRAM? That is, how do you inform the firmware
> what portion of SRAM has been allocated to the
> driver?
> 
> Also, usage of SRAM is not required for basic driver
> function, correct? So, a platform which does not
> have SRAM to spare for this driver could still have
> a portion of SDRAM/DDR allocated to be used as the
> shared buffer? I guess SRAM was used only for lower
> access times. But it should still be possible to
> sustain lower baudrates with SDRAM/DDR?

The sram is allocated dynamically in the driver. 
After allocation, we write the pointer into the PRU, so in case the
driver allocates memory form the DDR, it will write this info into the
PRU and it will work. But, because of DDR access latencies, the UART
will work only for lower baud rates. 

RE: [PATCH v4 08/11] tty: add pruss SUART driver

[Nori, Sekhar]

Hi Subhasish,

On Wed, Apr 27, 2011 at 18:45:06, Subhasish Ghosh wrote:
>  >> >>The driver should probably just get sram
> >> >> space through platform data so that it doesn't depend on the
> >> >> platform specific sram allocation function.
> >>
> >> Are you suggesting that I go back to that implementation.
> >
> > No, the platform code should use the SRAM allocator and
> > pass on the allocated memory to the driver.
> 
> SG - So, should I call the sram_alloc() in the platform setup function. 

Can you please shed some light on how SRAM
is being used in the driver? Looking at the
driver, it looks like it is used as a shared
buffer between the PRU firmware and kernel.

If yes, how do you cope with dynamic allocation
of SRAM? That is, how do you inform the firmware
what portion of SRAM has been allocated to the
driver?

Also, usage of SRAM is not required for basic driver
function, correct? So, a platform which does not
have SRAM to spare for this driver could still have
a portion of SDRAM/DDR allocated to be used as the
shared buffer? I guess SRAM was used only for lower
access times. But it should still be possible to
sustain lower baudrates with SDRAM/DDR?

Thanks,
Sekhar

[PATCH v4 08/11] tty: add pruss SUART driver

[Nori, Sekhar]

Hi Subhasish,

On Wed, Apr 27, 2011 at 18:45:06, Subhasish Ghosh wrote:
>  >> >>The driver should probably just get sram
> >> >> space through platform data so that it doesn't depend on the
> >> >> platform specific sram allocation function.
> >>
> >> Are you suggesting that I go back to that implementation.
> >
> > No, the platform code should use the SRAM allocator and
> > pass on the allocated memory to the driver.
> 
> SG - So, should I call the sram_alloc() in the platform setup function. 

Can you please shed some light on how SRAM
is being used in the driver? Looking at the
driver, it looks like it is used as a shared
buffer between the PRU firmware and kernel.

If yes, how do you cope with dynamic allocation
of SRAM? That is, how do you inform the firmware
what portion of SRAM has been allocated to the
driver?

Also, usage of SRAM is not required for basic driver
function, correct? So, a platform which does not
have SRAM to spare for this driver could still have
a portion of SDRAM/DDR allocated to be used as the
shared buffer? I guess SRAM was used only for lower
access times. But it should still be possible to
sustain lower baudrates with SDRAM/DDR?

Thanks,
Sekhar

Re: [PATCH v4 08/11] tty: add pruss SUART driver

[Subhasish Ghosh]

 >> >>The driver should probably just get sram
>> >> space through platform data so that it doesn't depend on the
>> >> platform specific sram allocation function.
>>
>> Are you suggesting that I go back to that implementation.
>
> No, the platform code should use the SRAM allocator and
> pass on the allocated memory to the driver.

SG - So, should I call the sram_alloc() in the platform setup function. 
Something like this:

suart_probe() {
...
pdata.setup(&sram_aadr);
...use sram data;
}

suart_remove() {
...
pdata.free(&sram_aadr);
...
} 

[PATCH v4 08/11] tty: add pruss SUART driver

[Subhasish Ghosh]

 >> >>The driver should probably just get sram
>> >> space through platform data so that it doesn't depend on the
>> >> platform specific sram allocation function.
>>
>> Are you suggesting that I go back to that implementation.
>
> No, the platform code should use the SRAM allocator and
> pass on the allocated memory to the driver.

SG - So, should I call the sram_alloc() in the platform setup function. 
Something like this:

suart_probe() {
...
pdata.setup(&sram_aadr);
...use sram data;
}

suart_remove() {
...
pdata.free(&sram_aadr);
...
} 

RE: [PATCH v4 08/11] tty: add pruss SUART driver

[Nori, Sekhar]

On Wed, Apr 27, 2011 at 10:53:38, Subhasish Ghosh wrote:
> >> There should be no build time dependency with this patch
> >> (the above patch just changes which pool of SRAM the
> >> allocation happens from)
> >>
> >> But, this brings out an important dependency of the patch
> >> calling platform specific sram allocator functions. There
> >> has been SRAM allocator consolidation work done by Russell
> >> and as a result the SRAM allocator API for DaVinci will
> >> actually change.
> 
> I earlier had an implementation where I would get the sram memory addresses
> through the .resource structure and ioremap it in the driver.

This is wrong since it assumes the whole SRAM is available
for usage by your driver. We already have an allocator
for SRAM.

> 
> >>The driver should probably just get sram
> >> space through platform data so that it doesn't depend on the
> >> platform specific sram allocation function.
> 
> Are you suggesting that I go back to that implementation.

No, the platform code should use the SRAM allocator and
pass on the allocated memory to the driver.

Thanks,
Sekhar

[PATCH v4 08/11] tty: add pruss SUART driver

[Nori, Sekhar]

On Wed, Apr 27, 2011 at 10:53:38, Subhasish Ghosh wrote:
> >> There should be no build time dependency with this patch
> >> (the above patch just changes which pool of SRAM the
> >> allocation happens from)
> >>
> >> But, this brings out an important dependency of the patch
> >> calling platform specific sram allocator functions. There
> >> has been SRAM allocator consolidation work done by Russell
> >> and as a result the SRAM allocator API for DaVinci will
> >> actually change.
> 
> I earlier had an implementation where I would get the sram memory addresses
> through the .resource structure and ioremap it in the driver.

This is wrong since it assumes the whole SRAM is available
for usage by your driver. We already have an allocator
for SRAM.

> 
> >>The driver should probably just get sram
> >> space through platform data so that it doesn't depend on the
> >> platform specific sram allocation function.
> 
> Are you suggesting that I go back to that implementation.

No, the platform code should use the SRAM allocator and
pass on the allocated memory to the driver.

Thanks,
Sekhar

Re: [PATCH v4 08/11] tty: add pruss SUART driver

[Subhasish Ghosh]

>> There should be no build time dependency with this patch
>> (the above patch just changes which pool of SRAM the
>> allocation happens from)
>>
>> But, this brings out an important dependency of the patch
>> calling platform specific sram allocator functions. There
>> has been SRAM allocator consolidation work done by Russell
>> and as a result the SRAM allocator API for DaVinci will
>> actually change.

I earlier had an implementation where I would get the sram memory addresses
through the .resource structure and ioremap it in the driver.

>>The driver should probably just get sram
>> space through platform data so that it doesn't depend on the
>> platform specific sram allocation function.

Are you suggesting that I go back to that implementation.
Also, should I remove the dependency list from the patch comments then.


--------------------------------------------------
From: "Greg KH" <gregkh@suse.de>
Sent: Tuesday, April 26, 2011 6:15 PM
To: "Nori, Sekhar" <nsekhar@ti.com>
Cc: "Greg KH" <greg@kroah.com>; "Subhasish Ghosh" 
<subhasish@mistralsolutions.com>; 
<davinci-linux-open-source@linux.davincidsp.com>; 
<linux-arm-kernel@lists.infradead.org>; "Watkins, Melissa" 
<m-watkins@ti.com>; <sachi@mistralsolutions.com>; "Andrew Morton" 
<akpm@linux-foundation.org>; "Randy Dunlap" <randy.dunlap@oracle.com>; "open 
list" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v4 08/11] tty: add pruss SUART driver

> On Tue, Apr 26, 2011 at 12:21:04PM +0530, Nori, Sekhar wrote:
>> On Tue, Apr 26, 2011 at 02:50:56, Greg KH wrote:
>> > On Fri, Apr 22, 2011 at 05:38:26PM +0530, Subhasish Ghosh wrote:
>> > > This patch adds support for the TTY compliant
>> > > Soft-UART device emulated on PRUSS.
>> > >
>> > > This patch depends on:
>> > > davinci: macro rename DA8XX_LPSC0_DMAX to DA8XX_LPSC0_PRUSS.
>> > >             https://patchwork.kernel.org/patch/615681/
>>
>> This is already in mainline. Plus this patch
>> doesn't really seem to depend on this commit.
>>
>> > > davinci: changed SRAM allocator to shared ram.
>> > >             https://patchwork.kernel.org/patch/549351/
>>
>> There should be no build time dependency with this patch
>> (the above patch just changes which pool of SRAM the
>> allocation happens from)
>>
>> But, this brings out an important dependency of the patch
>> calling platform specific sram allocator functions. There
>> has been SRAM allocator consolidation work done by Russell
>> and as a result the SRAM allocator API for DaVinci will
>> actually change. The driver should probably just get sram
>> space through platform data so that it doesn't depend on the
>> platform specific sram allocation function.
>
> Ok, care to fix up the code then?
>
>> > Who is going to be applying these patches to the tree?
>> >
>> > Should this driver go through a davinci subtree because of these
>> > dependancies?
>>
>> No, driver and platform changes can be merged separately
>> if the above aspect is taken care of. Russell has been
>> pushing back on merging driver patches through his tree
>> unless absolutely required.
>
> That's fine, I'll take it through my tree then, care to resolve the
> above issue and resend it?
>
> thanks,
>
> greg k-h 

[PATCH v4 08/11] tty: add pruss SUART driver

[Subhasish Ghosh]

>> There should be no build time dependency with this patch
>> (the above patch just changes which pool of SRAM the
>> allocation happens from)
>>
>> But, this brings out an important dependency of the patch
>> calling platform specific sram allocator functions. There
>> has been SRAM allocator consolidation work done by Russell
>> and as a result the SRAM allocator API for DaVinci will
>> actually change.

I earlier had an implementation where I would get the sram memory addresses
through the .resource structure and ioremap it in the driver.

>>The driver should probably just get sram
>> space through platform data so that it doesn't depend on the
>> platform specific sram allocation function.

Are you suggesting that I go back to that implementation.
Also, should I remove the dependency list from the patch comments then.


--------------------------------------------------
From: "Greg KH" <gregkh@suse.de>
Sent: Tuesday, April 26, 2011 6:15 PM
To: "Nori, Sekhar" <nsekhar@ti.com>
Cc: "Greg KH" <greg@kroah.com>; "Subhasish Ghosh" 
<subhasish@mistralsolutions.com>; 
<davinci-linux-open-source@linux.davincidsp.com>; 
<linux-arm-kernel@lists.infradead.org>; "Watkins, Melissa" 
<m-watkins@ti.com>; <sachi@mistralsolutions.com>; "Andrew Morton" 
<akpm@linux-foundation.org>; "Randy Dunlap" <randy.dunlap@oracle.com>; "open 
list" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v4 08/11] tty: add pruss SUART driver

> On Tue, Apr 26, 2011 at 12:21:04PM +0530, Nori, Sekhar wrote:
>> On Tue, Apr 26, 2011 at 02:50:56, Greg KH wrote:
>> > On Fri, Apr 22, 2011 at 05:38:26PM +0530, Subhasish Ghosh wrote:
>> > > This patch adds support for the TTY compliant
>> > > Soft-UART device emulated on PRUSS.
>> > >
>> > > This patch depends on:
>> > > davinci: macro rename DA8XX_LPSC0_DMAX to DA8XX_LPSC0_PRUSS.
>> > >             https://patchwork.kernel.org/patch/615681/
>>
>> This is already in mainline. Plus this patch
>> doesn't really seem to depend on this commit.
>>
>> > > davinci: changed SRAM allocator to shared ram.
>> > >             https://patchwork.kernel.org/patch/549351/
>>
>> There should be no build time dependency with this patch
>> (the above patch just changes which pool of SRAM the
>> allocation happens from)
>>
>> But, this brings out an important dependency of the patch
>> calling platform specific sram allocator functions. There
>> has been SRAM allocator consolidation work done by Russell
>> and as a result the SRAM allocator API for DaVinci will
>> actually change. The driver should probably just get sram
>> space through platform data so that it doesn't depend on the
>> platform specific sram allocation function.
>
> Ok, care to fix up the code then?
>
>> > Who is going to be applying these patches to the tree?
>> >
>> > Should this driver go through a davinci subtree because of these
>> > dependancies?
>>
>> No, driver and platform changes can be merged separately
>> if the above aspect is taken care of. Russell has been
>> pushing back on merging driver patches through his tree
>> unless absolutely required.
>
> That's fine, I'll take it through my tree then, care to resolve the
> above issue and resend it?
>
> thanks,
>
> greg k-h 

Re: [PATCH v4 08/11] tty: add pruss SUART driver

[Greg KH]

On Tue, Apr 26, 2011 at 12:21:04PM +0530, Nori, Sekhar wrote:
> On Tue, Apr 26, 2011 at 02:50:56, Greg KH wrote:
> > On Fri, Apr 22, 2011 at 05:38:26PM +0530, Subhasish Ghosh wrote:
> > > This patch adds support for the TTY compliant
> > > Soft-UART device emulated on PRUSS.
> > > 
> > > This patch depends on:
> > > davinci: macro rename DA8XX_LPSC0_DMAX to DA8XX_LPSC0_PRUSS.
> > >             https://patchwork.kernel.org/patch/615681/
> 
> This is already in mainline. Plus this patch
> doesn't really seem to depend on this commit.
> 
> > > davinci: changed SRAM allocator to shared ram.
> > >             https://patchwork.kernel.org/patch/549351/
> 
> There should be no build time dependency with this patch
> (the above patch just changes which pool of SRAM the
> allocation happens from)
> 
> But, this brings out an important dependency of the patch
> calling platform specific sram allocator functions. There
> has been SRAM allocator consolidation work done by Russell
> and as a result the SRAM allocator API for DaVinci will
> actually change. The driver should probably just get sram
> space through platform data so that it doesn't depend on the
> platform specific sram allocation function.

Ok, care to fix up the code then?

> > Who is going to be applying these patches to the tree?
> > 
> > Should this driver go through a davinci subtree because of these
> > dependancies?
> 
> No, driver and platform changes can be merged separately
> if the above aspect is taken care of. Russell has been
> pushing back on merging driver patches through his tree
> unless absolutely required.

That's fine, I'll take it through my tree then, care to resolve the
above issue and resend it?

thanks,

greg k-h

[PATCH v4 08/11] tty: add pruss SUART driver

[Greg KH]

On Tue, Apr 26, 2011 at 12:21:04PM +0530, Nori, Sekhar wrote:
> On Tue, Apr 26, 2011 at 02:50:56, Greg KH wrote:
> > On Fri, Apr 22, 2011 at 05:38:26PM +0530, Subhasish Ghosh wrote:
> > > This patch adds support for the TTY compliant
> > > Soft-UART device emulated on PRUSS.
> > > 
> > > This patch depends on:
> > > davinci: macro rename DA8XX_LPSC0_DMAX to DA8XX_LPSC0_PRUSS.
> > >             https://patchwork.kernel.org/patch/615681/
> 
> This is already in mainline. Plus this patch
> doesn't really seem to depend on this commit.
> 
> > > davinci: changed SRAM allocator to shared ram.
> > >             https://patchwork.kernel.org/patch/549351/
> 
> There should be no build time dependency with this patch
> (the above patch just changes which pool of SRAM the
> allocation happens from)
> 
> But, this brings out an important dependency of the patch
> calling platform specific sram allocator functions. There
> has been SRAM allocator consolidation work done by Russell
> and as a result the SRAM allocator API for DaVinci will
> actually change. The driver should probably just get sram
> space through platform data so that it doesn't depend on the
> platform specific sram allocation function.

Ok, care to fix up the code then?

> > Who is going to be applying these patches to the tree?
> > 
> > Should this driver go through a davinci subtree because of these
> > dependancies?
> 
> No, driver and platform changes can be merged separately
> if the above aspect is taken care of. Russell has been
> pushing back on merging driver patches through his tree
> unless absolutely required.

That's fine, I'll take it through my tree then, care to resolve the
above issue and resend it?

thanks,

greg k-h

RE: [PATCH v4 08/11] tty: add pruss SUART driver

[Nori, Sekhar]

On Tue, Apr 26, 2011 at 02:50:56, Greg KH wrote:
> On Fri, Apr 22, 2011 at 05:38:26PM +0530, Subhasish Ghosh wrote:
> > This patch adds support for the TTY compliant
> > Soft-UART device emulated on PRUSS.
> > 
> > This patch depends on:
> > davinci: macro rename DA8XX_LPSC0_DMAX to DA8XX_LPSC0_PRUSS.
> >             https://patchwork.kernel.org/patch/615681/

This is already in mainline. Plus this patch
doesn't really seem to depend on this commit.

> > davinci: changed SRAM allocator to shared ram.
> >             https://patchwork.kernel.org/patch/549351/

There should be no build time dependency with this patch
(the above patch just changes which pool of SRAM the
allocation happens from)

But, this brings out an important dependency of the patch
calling platform specific sram allocator functions. There
has been SRAM allocator consolidation work done by Russell
and as a result the SRAM allocator API for DaVinci will
actually change. The driver should probably just get sram
space through platform data so that it doesn't depend on the
platform specific sram allocation function.

> 
> Who is going to be applying these patches to the tree?
> 
> Should this driver go through a davinci subtree because of these
> dependancies?

No, driver and platform changes can be merged separately
if the above aspect is taken care of. Russell has been
pushing back on merging driver patches through his tree
unless absolutely required.

Thanks,
Sekhar

[PATCH v4 08/11] tty: add pruss SUART driver

[Nori, Sekhar]

On Tue, Apr 26, 2011 at 02:50:56, Greg KH wrote:
> On Fri, Apr 22, 2011 at 05:38:26PM +0530, Subhasish Ghosh wrote:
> > This patch adds support for the TTY compliant
> > Soft-UART device emulated on PRUSS.
> > 
> > This patch depends on:
> > davinci: macro rename DA8XX_LPSC0_DMAX to DA8XX_LPSC0_PRUSS.
> >             https://patchwork.kernel.org/patch/615681/

This is already in mainline. Plus this patch
doesn't really seem to depend on this commit.

> > davinci: changed SRAM allocator to shared ram.
> >             https://patchwork.kernel.org/patch/549351/

There should be no build time dependency with this patch
(the above patch just changes which pool of SRAM the
allocation happens from)

But, this brings out an important dependency of the patch
calling platform specific sram allocator functions. There
has been SRAM allocator consolidation work done by Russell
and as a result the SRAM allocator API for DaVinci will
actually change. The driver should probably just get sram
space through platform data so that it doesn't depend on the
platform specific sram allocation function.

> 
> Who is going to be applying these patches to the tree?
> 
> Should this driver go through a davinci subtree because of these
> dependancies?

No, driver and platform changes can be merged separately
if the above aspect is taken care of. Russell has been
pushing back on merging driver patches through his tree
unless absolutely required.

Thanks,
Sekhar

Re: [PATCH v4 08/11] tty: add pruss SUART driver

[Greg KH]

On Fri, Apr 22, 2011 at 05:38:26PM +0530, Subhasish Ghosh wrote:
> This patch adds support for the TTY compliant
> Soft-UART device emulated on PRUSS.
> 
> This patch depends on:
> davinci: macro rename DA8XX_LPSC0_DMAX to DA8XX_LPSC0_PRUSS.
>             https://patchwork.kernel.org/patch/615681/
> davinci: changed SRAM allocator to shared ram.
>             https://patchwork.kernel.org/patch/549351/

Who is going to be applying these patches to the tree?

Should this driver go through a davinci subtree because of these
dependancies?

thanks,

greg k-h

[PATCH v4 08/11] tty: add pruss SUART driver

[Greg KH]

On Fri, Apr 22, 2011 at 05:38:26PM +0530, Subhasish Ghosh wrote:
> This patch adds support for the TTY compliant
> Soft-UART device emulated on PRUSS.
> 
> This patch depends on:
> davinci: macro rename DA8XX_LPSC0_DMAX to DA8XX_LPSC0_PRUSS.
>             https://patchwork.kernel.org/patch/615681/
> davinci: changed SRAM allocator to shared ram.
>             https://patchwork.kernel.org/patch/549351/

Who is going to be applying these patches to the tree?

Should this driver go through a davinci subtree because of these
dependancies?

thanks,

greg k-h

[PATCH v4 08/11] tty: add pruss SUART driver

[Subhasish Ghosh]

This patch adds support for the TTY compliant
Soft-UART device emulated on PRUSS.

This patch depends on:
davinci: macro rename DA8XX_LPSC0_DMAX to DA8XX_LPSC0_PRUSS.
            https://patchwork.kernel.org/patch/615681/
davinci: changed SRAM allocator to shared ram.
            https://patchwork.kernel.org/patch/549351/

Signed-off-by: Subhasish Ghosh <subhasish@mistralsolutions.com>
---
 drivers/tty/serial/Kconfig             |   18 +
 drivers/tty/serial/Makefile            |    6 +
 drivers/tty/serial/pruss_suart.c       | 1061 ++++++++++++++++++++
 drivers/tty/serial/pruss_suart.h       | 1038 +++++++++++++++++++
 drivers/tty/serial/pruss_suart_api.c   | 1710 ++++++++++++++++++++++++++++++++
 drivers/tty/serial/pruss_suart_utils.c |  393 ++++++++
 include/linux/serial_core.h            |    2 +
 7 files changed, 4228 insertions(+), 0 deletions(-)
 create mode 100644 drivers/tty/serial/pruss_suart.c
 create mode 100644 drivers/tty/serial/pruss_suart.h
 create mode 100644 drivers/tty/serial/pruss_suart_api.c
 create mode 100644 drivers/tty/serial/pruss_suart_utils.c

diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 2b83346..6c26ebf 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -1596,4 +1596,22 @@ config SERIAL_PCH_UART
 	  This driver is for PCH(Platform controller Hub) UART of Intel EG20T
 	  which is an IOH(Input/Output Hub) for x86 embedded processor.
 	  Enabling PCH_DMA, this PCH UART works as DMA mode.
+
+config SERIAL_PRUSS_SUART
+	depends on ARCH_DAVINCI && ARCH_DAVINCI_DA850
+	select SERIAL_CORE
+	tristate "PRUSS based SoftUART emulation on DA8XX"
+	---help---
+	This driver emulates up to eight different UARTs on the PRUSS.
+	You may modify the NR_SUARTS macro in the driver to emulate
+	less number of UARTS as per your requirement.
+	If not sure, mark No
+
+config PRUSS_SUART_MCASP
+	depends on ARCH_DAVINCI_DA830 && SERIAL_PRUSS_SUART
+	default "0"
+	int "McASP number"
+	---help---
+	Enter the McASP number to use with SUART (0, 1 or 2).
+	You will need to recompile the kernel if this is changed.
 endmenu
diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile
index 8ea92e9..e1eaaf3 100644
--- a/drivers/tty/serial/Makefile
+++ b/drivers/tty/serial/Makefile
@@ -92,3 +92,9 @@ obj-$(CONFIG_SERIAL_MRST_MAX3110)	+= mrst_max3110.o
 obj-$(CONFIG_SERIAL_MFD_HSU)	+= mfd.o
 obj-$(CONFIG_SERIAL_IFX6X60)  	+= ifx6x60.o
 obj-$(CONFIG_SERIAL_PCH_UART)	+= pch_uart.o
+
+pruss_uart-objs :=	pruss_suart.o \
+			pruss_suart_api.o \
+			pruss_suart_utils.o
+
+obj-$(CONFIG_SERIAL_PRUSS_SUART) += pruss_uart.o
diff --git a/drivers/tty/serial/pruss_suart.c b/drivers/tty/serial/pruss_suart.c
new file mode 100644
index 0000000..37c3c21
--- /dev/null
+++ b/drivers/tty/serial/pruss_suart.c
@@ -0,0 +1,1061 @@
+/*
+ * PRUSS SUART Emulation device driver
+ * Author: subhasish@mistralsolutions.com
+ *
+ * This driver supports TI's PRU SUART Emulation and the
+ * specs for the same is available at <http://www.ti.com>
+ *
+ * Copyright (C) 2010, 2011 Texas Instruments Incorporated <http://www.ti.com/>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed as is WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial.h>
+#include <linux/serial_core.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/firmware.h>
+#include <linux/clk.h>
+#include <linux/serial_reg.h>
+#include <linux/delay.h>
+#include <linux/bitops.h>
+#include <mach/sram.h>
+#include "pruss_suart.h"
+
+#define NR_SUART			8
+#define DRV_NAME			"da8xx_pruss_uart"
+#define DRV_DESC			"PRUSS SUART Driver v1.0"
+#define MAX_SUART_RETRIES		100
+#define SUART_CNTX_SZ			512
+#define SUART_FIFO_TIMEOUT_DFLT		5
+#define SUART_FIFO_TIMEOUT_MIN		4
+#define SUART_FIFO_TIMEOUT_MAX		500
+
+/* Default timeout set to 5ms */
+static s16 suart_timeout = SUART_FIFO_TIMEOUT_DFLT;
+module_param(suart_timeout, short, S_IRUGO);
+MODULE_PARM_DESC(suart_timeout,
+		 "fifo timeout in milli seconds (min: 4; max: 500)");
+
+struct suart_fifo {
+	void *fifo_vaddr_buff_tx;
+	void *fifo_vaddr_buff_rx;
+	void *fifo_phys_addr_tx;
+	void *fifo_phys_addr_rx;
+};
+
+struct omapl_pru_suart {
+	struct uart_port port[NR_SUART];
+	struct device *dev;
+	unsigned long tx_empty[NR_SUART];
+	struct clk *clk_mcasp;
+	struct suart_fifo suart_fifo_addr[NR_SUART];
+	struct suart_handle suart_hdl[NR_SUART];
+	struct pruss_suart_iomap suart_iomap;
+	struct tasklet_struct tx_task[NR_SUART];
+	u32 clk_freq_pru;
+	u32 clk_freq_mcasp;
+	u32 tx_loadsz;
+};
+
+static u32 suart_get_duplex(struct omapl_pru_suart *soft_uart, u32 uart_no)
+{
+	return soft_uart->suart_hdl[uart_no].uart_type;
+}
+
+static inline void __stop_tx(struct omapl_pru_suart *soft_uart, u32 uart_no)
+{
+	struct device *dev = soft_uart->dev;
+	unsigned long flags = 0;
+	struct uart_port *port = &soft_uart->port[uart_no];
+	u16 txready;
+	u32 i;
+
+	/* Check if any TX in progress */
+	for (i = 0, txready = 1; (i < 10000) && txready; i++) {
+		txready = (pru_softuart_get_tx_status
+			(dev, &soft_uart->suart_hdl[uart_no]) &
+				CHN_TXRX_STATUS_RDY);
+	}
+	/* To stop tx, disable the TX interrupt */
+	spin_lock_irqsave(&port->lock, flags);
+	suart_intr_clrmask(dev, soft_uart->suart_hdl[uart_no].uart_num,
+				PRU_TX_INTR, CHN_TXRX_IE_MASK_CMPLT);
+	pru_softuart_clr_tx_status(dev, &soft_uart->suart_hdl[uart_no]);
+	spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void pruss_suart_stop_tx(struct uart_port *port)
+{
+	struct omapl_pru_suart *soft_uart =
+	    container_of(port, struct omapl_pru_suart, port[port->line]);
+
+	__stop_tx(soft_uart, port->line);
+}
+
+static void omapl_pru_tx_chars(struct omapl_pru_suart *soft_uart, u32 uart_no)
+{
+	struct circ_buf *xmit = &soft_uart->port[uart_no].state->xmit;
+	struct device *dev = soft_uart->dev;
+	s32 count = 0;
+
+	if (!(suart_get_duplex(soft_uart, uart_no) & ePRU_SUART_HALF_TX))
+		return;
+
+	if (uart_circ_empty(xmit) ||
+			uart_tx_stopped(&soft_uart->port[uart_no])) {
+		pruss_suart_stop_tx(&soft_uart->port[uart_no]);
+		set_bit(0, &soft_uart->tx_empty[uart_no]);
+		return;
+	}
+
+	for (count = 0; count <= soft_uart->tx_loadsz; count++) {
+		*((s8 *)soft_uart->suart_fifo_addr[uart_no].fifo_vaddr_buff_tx
+		+ count) = xmit->buf[xmit->tail];
+		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+		soft_uart->port[uart_no].icount.tx++;
+		if (uart_circ_empty(xmit)) {
+			uart_circ_clear(xmit);
+			break;
+		}
+	}
+
+	if (count == (SUART_FIFO_LEN + 1))
+		count = SUART_FIFO_LEN;
+
+	/* Write the character to the data port */
+	if (pru_softuart_write(dev,
+		&soft_uart->suart_hdl[uart_no],
+			(u32 *)&soft_uart->suart_fifo_addr
+				[uart_no].fifo_phys_addr_tx, count) != 0) {
+		dev_err(dev, "failed to tx data\n");
+	}
+
+	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+		uart_write_wakeup(&soft_uart->port[uart_no]);
+
+#if 0
+	if (uart_circ_empty(xmit))
+		__stop_tx(soft_uart, uart_no);
+#endif
+}
+
+static void suart_tx_task(unsigned long data)
+{
+	struct uart_port *port = (struct uart_port *)data;
+	struct omapl_pru_suart *soft_uart =
+		container_of(port, struct omapl_pru_suart, port[port->line]);
+
+	omapl_pru_tx_chars(soft_uart, port->line);
+}
+
+static void omapl_pru_rx_chars(struct omapl_pru_suart *soft_uart, u32 uart_no)
+{
+	struct tty_struct *tty = NULL;
+	struct device *dev = soft_uart->dev;
+	s8 flags = TTY_NORMAL;
+	u16 rx_status, data_len = SUART_FIFO_LEN;
+	u32 data_len_read;
+	u8 suart_data[SUART_FIFO_LEN + 1];
+	s32 i = 0;
+
+	if (!(suart_get_duplex(soft_uart, uart_no) & ePRU_SUART_HALF_RX))
+		return;
+
+	/* read the status */
+	rx_status = pru_softuart_get_rx_status(dev,
+			&soft_uart->suart_hdl[uart_no]);
+
+	pru_softuart_read_data(dev, &soft_uart->suart_hdl[uart_no],
+			suart_data, data_len + 1, &data_len_read);
+
+	tty = tty_port_tty_get(&soft_uart->port[uart_no].state->port);
+
+	if (!tty)
+		return;
+
+	/* check for errors */
+	if (rx_status & CHN_TXRX_STATUS_ERR) {
+		if (rx_status & CHN_TXRX_STATUS_FE)
+			soft_uart->port[uart_no].icount.frame++;
+		if (rx_status & CHN_TXRX_STATUS_OVRNERR)
+			soft_uart->port[uart_no].icount.overrun++;
+		if (rx_status & CHN_TXRX_STATUS_BI)
+			soft_uart->port[uart_no].icount.brk++;
+			rx_status &= soft_uart->port[uart_no].
+						read_status_mask;
+		if (rx_status & CHN_TXRX_STATUS_FE)
+			flags = TTY_FRAME;
+		if (rx_status & CHN_TXRX_STATUS_OVRNERR)
+			flags = TTY_OVERRUN;
+		if (rx_status & CHN_TXRX_STATUS_BI)
+			flags = TTY_BREAK;
+
+#ifdef SUPPORT_SYSRQ
+		soft_uart->port[uart_no].sysrq = 0;
+#endif
+	} else {
+		for (i = 0; i <= data_len_read; i++) {
+			soft_uart->port[uart_no].icount.rx++;
+			/* check for sys rq */
+			if (uart_handle_sysrq_char
+			    (&soft_uart->port[uart_no], suart_data))
+				continue;
+		}
+		tty_insert_flip_string(tty, suart_data, data_len_read);
+	}
+
+	/* push data into tty */
+	pru_softuart_clr_rx_status(dev, &soft_uart->suart_hdl[uart_no]);
+	tty_flip_buffer_push(tty);
+	tty_kref_put(tty);
+}
+
+static irqreturn_t pruss_suart_interrupt(s32 irq, void *dev_id)
+{
+	struct uart_port *port = dev_id;
+	struct omapl_pru_suart *soft_uart =
+		container_of(port, struct omapl_pru_suart, port[port->line]);
+	struct device *dev = soft_uart->dev;
+	u16 txrx_flag;
+	u32 ret;
+	unsigned long flags = 0;
+	u16 uart_num = port->line + 1;
+
+	spin_lock_irqsave(&port->lock, flags);
+
+	do {
+		ret = pru_softuart_get_isrstatus(dev, uart_num, &txrx_flag);
+		if (ret != 0) {
+			dev_err(dev, "suart%d: failed to get interrupt, ret:"
+				" 0x%X txrx_flag 0x%X\n",
+				port->line, ret, txrx_flag);
+				spin_unlock_irqrestore(&port->lock, flags);
+			return IRQ_NONE;
+		}
+		if ((PRU_RX_INTR & txrx_flag) == PRU_RX_INTR) {
+			pru_intr_clr_isrstatus(dev, uart_num, PRU_RX_INTR);
+			if ((soft_uart->port[port->line].ignore_status_mask &
+				CHN_TXRX_STATUS_RDY) == CHN_TXRX_STATUS_RDY) {
+				pru_softuart_clr_rx_status(dev,
+					&soft_uart->suart_hdl
+				[port->line]);
+			} else {
+				omapl_pru_rx_chars(soft_uart, port->line);
+			}
+		}
+
+		if ((PRU_TX_INTR & txrx_flag) == PRU_TX_INTR) {
+			pru_intr_clr_isrstatus(dev, uart_num, PRU_TX_INTR);
+			pru_softuart_clr_tx_status(dev, &soft_uart->suart_hdl
+						 [port->line]);
+			tasklet_schedule(&soft_uart->tx_task[port->line]);
+		}
+	} while (txrx_flag & (PRU_RX_INTR | PRU_TX_INTR));
+
+	spin_unlock_irqrestore(&port->lock, flags);
+	return IRQ_HANDLED;
+}
+
+static void pruss_suart_stop_rx(struct uart_port *port)
+{
+	struct omapl_pru_suart *soft_uart =
+	    container_of(port, struct omapl_pru_suart, port[port->line]);
+	struct device *dev = soft_uart->dev;
+	unsigned long flags = 0;
+
+	spin_lock_irqsave(&port->lock, flags);
+	/* disable rx interrupt */
+	suart_intr_clrmask(dev, soft_uart->suart_hdl[port->line].uart_num,
+			   PRU_RX_INTR, CHN_TXRX_IE_MASK_BI
+			   | CHN_TXRX_IE_MASK_FE | CHN_TXRX_IE_MASK_CMPLT
+			   | CHN_TXRX_IE_MASK_TIMEOUT);
+	spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void pruss_suart_enable_ms(struct uart_port *port)
+{
+	struct omapl_pru_suart *soft_uart =
+	    container_of(port, struct omapl_pru_suart, port[port->line]);
+	struct device *dev = soft_uart->dev;
+	dev_err(dev, "modem control timer not supported\n");
+}
+
+static void pruss_suart_start_tx(struct uart_port *port)
+{
+	struct omapl_pru_suart *soft_uart =
+	    container_of(port, struct omapl_pru_suart, port[port->line]);
+	struct device *dev = soft_uart->dev;
+	unsigned long flags = 0;
+
+	/* unmask the tx interrupts */
+	spin_lock_irqsave(&port->lock, flags);
+	suart_intr_setmask(dev, soft_uart->suart_hdl[port->line].uart_num,
+			   PRU_TX_INTR, CHN_TXRX_IE_MASK_CMPLT);
+	spin_unlock_irqrestore(&port->lock, flags);
+
+	if (test_and_clear_bit(0, &soft_uart->tx_empty[port->line]))
+		omapl_pru_tx_chars(soft_uart, port->line);
+}
+
+static u32 pruss_suart_tx_empty(struct uart_port *port)
+{
+	struct omapl_pru_suart *soft_uart =
+	    container_of(port, struct omapl_pru_suart, port[port->line]);
+	struct device *dev = soft_uart->dev;
+
+	return (pru_softuart_get_tx_status(dev,
+		&soft_uart->suart_hdl[port->line])
+		& CHN_TXRX_STATUS_RDY) ? 0 : TIOCSER_TEMT;
+}
+
+static u32 pruss_suart_get_mctrl(struct uart_port *port)
+{
+	return -ENOTSUPP;
+}
+
+static void pruss_suart_set_mctrl(struct uart_port *port, u32 mctrl)
+{
+	struct omapl_pru_suart *soft_uart =
+	    container_of(port, struct omapl_pru_suart, port[port->line]);
+	struct device *dev = soft_uart->dev;
+	dev_dbg(dev, "modem control not supported\n");
+}
+
+static void pruss_suart_break_ctl(struct uart_port *port, s32 break_state)
+{
+	struct omapl_pru_suart *soft_uart =
+	    container_of(port, struct omapl_pru_suart, port[port->line]);
+	struct device *dev = soft_uart->dev;
+	unsigned long flags = 0;
+
+	spin_lock_irqsave(&port->lock, flags);
+
+	if (break_state == -1)
+		suart_intr_clrmask(dev,
+			soft_uart->suart_hdl[port->line].uart_num,
+			PRU_RX_INTR, CHN_TXRX_IE_MASK_BI);
+	else
+		suart_intr_setmask(dev,
+			soft_uart->suart_hdl[port->line].uart_num,
+			PRU_RX_INTR, CHN_TXRX_IE_MASK_BI);
+
+	spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void pruss_suart_set_termios(struct uart_port *port,
+				  struct ktermios *termios,
+				  struct ktermios *old)
+{
+	struct omapl_pru_suart *soft_uart =
+	    container_of(port, struct omapl_pru_suart, port[port->line]);
+	struct device *dev = soft_uart->dev;
+	u8 cval = 0;
+	unsigned long flags = 0;
+	u32 baud = 0;
+	u32 old_csize = old ? old->c_cflag & CSIZE : CS8;
+
+/*
+ * Do not allow unsupported configurations to be set
+ */
+	if (1) {
+		termios->c_cflag &= ~(CRTSCTS | CMSPAR | CSTOPB
+				      | PARENB | PARODD | CMSPAR);
+	}
+
+	switch (termios->c_cflag & CSIZE) {
+	case CS6:
+		cval = ePRU_SUART_DATA_BITS6;
+		break;
+	case CS7:
+		cval = ePRU_SUART_DATA_BITS7;
+		break;
+	default:
+	case CS8:
+		cval = ePRU_SUART_DATA_BITS8;
+		break;
+	}
+	/*
+	 * We do not support CS5.
+	 */
+	if ((termios->c_cflag & CSIZE) == CS5) {
+		termios->c_cflag &= ~CSIZE;
+		termios->c_cflag |= old_csize;
+	}
+	if (pru_softuart_setdatabits
+		(dev, &soft_uart->suart_hdl[port->line], cval, cval) != 0)
+		dev_err(dev, "failed to set data bits to: %d\n", cval);
+
+/*
+ * Ask the core to calculate the divisor for us.
+ */
+	baud = uart_get_baud_rate(port, termios, old,
+			  port->uartclk / 16 / 0xffff,
+			  port->uartclk / 16);
+
+/*
+ * Ok, we're now changing the port state.  Do it with
+ * interrupts disabled.
+ */
+	spin_lock_irqsave(&port->lock, flags);
+
+	/* Set the baud */
+	if (pru_softuart_setbaud(dev, &soft_uart->suart_hdl[port->line],
+				 SUART_DEFAULT_BAUD / baud,
+				 SUART_DEFAULT_BAUD / baud) != 0)
+		dev_err(dev, "failed to set baud to: %d\n", baud);
+
+/*
+ * update port->read_config_mask and port->ignore_config_mask
+ * to indicate the events we are interested in receiving
+ */
+	suart_intr_setmask(dev, soft_uart->suart_hdl[port->line].uart_num,
+			   PRU_RX_INTR, SUART_GBL_INTR_ERR_MASK);
+	port->read_status_mask = 0;
+	if (termios->c_iflag & INPCK) {	/* Input parity check not supported,
+					just enabled FE */
+		port->read_status_mask |= CHN_TXRX_STATUS_FE;
+		suart_intr_setmask(dev,
+			soft_uart->suart_hdl[port->line].uart_num,
+			PRU_RX_INTR, CHN_TXRX_IE_MASK_FE);
+	}
+	if (termios->c_iflag & (BRKINT | PARMRK)) {
+		port->read_status_mask |= CHN_TXRX_STATUS_BI;
+		suart_intr_setmask(dev,
+			soft_uart->suart_hdl[port->line].uart_num,
+			PRU_RX_INTR, CHN_TXRX_IE_MASK_BI);
+	}
+/*
+ * Characters to ignore
+ */
+	port->ignore_status_mask = 0;
+	if (termios->c_iflag & IGNBRK) {
+		port->ignore_status_mask |= CHN_TXRX_STATUS_BI;
+		/*
+		 * If we're ignoring break indicators,
+		 * ignore overruns too (for real raw support).
+		 */
+		if (termios->c_iflag & IGNPAR) {
+			port->ignore_status_mask |=
+			    (CHN_TXRX_STATUS_OVRNERR | CHN_TXRX_STATUS_FE);
+			/*
+			 * Overrun in case of RX
+			 * Underrun in case of TX
+			 */
+			suart_intr_clrmask(dev, soft_uart->
+					   suart_hdl[port->line].uart_num,
+					   PRU_RX_INTR, CHN_TXRX_IE_MASK_FE);
+		}
+		suart_intr_clrmask(dev,
+			soft_uart->suart_hdl[port->line].uart_num,
+			PRU_RX_INTR, CHN_TXRX_IE_MASK_BI);
+	}
+/*
+ * ignore all characters if CREAD is not set
+ */
+	if ((termios->c_cflag & CREAD) == 0) {
+		port->ignore_status_mask |= CHN_TXRX_STATUS_RDY;
+		pruss_suart_stop_rx(port);
+	}
+	/*
+	* update the per port timeout
+	*/
+	uart_update_timeout(port, termios->c_cflag, baud);
+
+	spin_unlock_irqrestore(&port->lock, flags);
+
+	/* Don't rewrite B0 */
+	if (tty_termios_baud_rate(termios))
+		tty_termios_encode_baud_rate(termios, baud, baud);
+}
+
+/*
+ *	Grab any interrupt resources and initialise any low level driver
+ *	state.  Enable the port for reception.  It should not activate
+ *	RTS nor DTR; this will be done via a separate call to set_mctrl.
+ *
+ *	This method will only be called when the port is initially opened.
+ *
+ *	Locking: port_sem taken.
+ *	Interrupts: globally disabled.
+ */
+static s32 pruss_suart_startup(struct uart_port *port)
+{
+	struct omapl_pru_suart *soft_uart =
+	    container_of(port, struct omapl_pru_suart, port[port->line]);
+	struct device *dev = soft_uart->dev;
+	unsigned long flags = 0;
+	s32 retval;
+
+	/*
+	 * Disable interrupts from this port
+	 */
+	spin_lock_irqsave(&port->lock, flags);
+	suart_intr_clrmask(dev, soft_uart->suart_hdl[port->line].uart_num,
+			   PRU_TX_INTR, CHN_TXRX_IE_MASK_CMPLT);
+	suart_intr_clrmask(dev, soft_uart->suart_hdl[port->line].uart_num,
+			   PRU_RX_INTR, CHN_TXRX_IE_MASK_BI
+			   | CHN_TXRX_IE_MASK_FE | CHN_TXRX_IE_MASK_CMPLT
+			   | CHN_TXRX_IE_MASK_TIMEOUT);
+	spin_unlock_irqrestore(&port->lock, flags);
+
+	retval = request_irq(port->irq, pruss_suart_interrupt,
+			     port->irqflags, "suart_irq", port);
+	if (retval) {
+		free_irq(port->irq, port); /* should we free this if err */
+		goto out;
+	}
+	/*
+	 * enable interrupts from this port
+	 */
+	spin_lock_irqsave(&port->lock, flags);
+	suart_intr_setmask(dev, soft_uart->suart_hdl[port->line].uart_num,
+			   PRU_RX_INTR, SUART_GBL_INTR_ERR_MASK);
+
+	suart_intr_setmask(dev, soft_uart->suart_hdl[port->line].uart_num,
+			   PRU_RX_INTR, CHN_TXRX_IE_MASK_BI
+			   | CHN_TXRX_IE_MASK_FE | CHN_TXRX_IE_MASK_CMPLT
+			   | CHN_TXRX_IE_MASK_TIMEOUT);
+
+	suart_intr_setmask(dev, soft_uart->suart_hdl[port->line].uart_num,
+			   PRU_TX_INTR, CHN_TXRX_IE_MASK_CMPLT);
+	spin_unlock_irqrestore(&port->lock, flags);
+
+	if ((suart_get_duplex(soft_uart, port->line) & ePRU_SUART_HALF_TX)
+	    == ePRU_SUART_HALF_TX) {
+		suart_pru_to_host_intr_enable(dev, soft_uart->
+			suart_hdl[port->line].uart_num, PRU_TX_INTR, true);
+	}
+	/* Seed RX if port is half-rx or full-duplex */
+	if ((suart_get_duplex(soft_uart, port->line) & ePRU_SUART_HALF_RX)
+		== ePRU_SUART_HALF_RX) {
+		suart_pru_to_host_intr_enable(dev, soft_uart->
+			suart_hdl[port->line].uart_num, PRU_RX_INTR, true);
+		pru_softuart_read(dev, &soft_uart->suart_hdl[port->line],
+			(u32 *)&soft_uart->suart_fifo_addr[port->line].
+			fifo_phys_addr_rx, SUART_FIFO_LEN);
+	}
+out:
+	return retval;
+}
+
+/*
+ * Disable the port, disable any break condition that may be in
+ * effect, and free any interrupt resources.  It should not disable
+ * RTS nor DTR; this will have already been done via a separate
+ * call to set_mctrl.
+ *
+ * Drivers must not access port->info once this call has completed.
+ *
+ * This method will only be called when there are no more users of
+ * this port.
+ *
+ * Locking: port_sem taken.
+ * Interrupts: caller dependent.
+ */
+
+static void pruss_suart_shutdown(struct uart_port *port)
+{
+	struct omapl_pru_suart *soft_uart =
+	    container_of(port, struct omapl_pru_suart, port[port->line]);
+	struct device *dev = soft_uart->dev;
+	unsigned long flags = 0;
+
+	/*
+	 * Disable interrupts from this port
+	 */
+	/* Disable BI and FE intr */
+	spin_lock_irqsave(&port->lock, flags);
+	suart_intr_clrmask(dev, soft_uart->suart_hdl[port->line].uart_num,
+			   PRU_TX_INTR, CHN_TXRX_IE_MASK_CMPLT);
+	suart_intr_clrmask(dev, soft_uart->suart_hdl[port->line].uart_num,
+			   PRU_RX_INTR, CHN_TXRX_IE_MASK_BI
+			   | CHN_TXRX_IE_MASK_FE | CHN_TXRX_IE_MASK_CMPLT
+			   | CHN_TXRX_IE_MASK_TIMEOUT);
+	spin_unlock_irqrestore(&port->lock, flags);
+
+	/* free interrupts */
+	free_irq(port->irq, port);
+}
+
+/*
+ * Return a pointer to a string constant describing the specified
+ * port, or return NULL, in which case the string 'unknown' is
+ * substituted.
+ *
+ * Locking: none.
+ * Interrupts: caller dependent.
+ */
+
+static const char *pruss_suart_type(struct uart_port *port)
+{
+	return "suart_tty";
+}
+
+/*
+ * Release any memory and IO region resources currently in use by
+ * the port.
+ *
+ * Locking: none.
+ * Interrupts: caller dependent.
+ */
+
+static void pruss_suart_release_port(struct uart_port *port)
+{
+	struct omapl_pru_suart *soft_uart =
+	    container_of(port, struct omapl_pru_suart, port[port->line]);
+	struct platform_device *pdev = to_platform_device(port->dev);
+
+	if (0 != pru_softuart_close(&soft_uart->suart_hdl[port->line]))
+		dev_err(&pdev->dev, "failed to close suart\n");
+
+	return;
+}
+
+/*
+ * Request any memory and IO region resources required by the port.
+ * If any fail, no resources should be registered when this function
+ * returns, and it should return -EBUSY on failure.
+ *
+ * Locking: none.
+ * Interrupts: caller dependent.
+ *
+ * We need to d/l the f/w in probe and since this api
+ * is called per uart, the request_mem_region should
+ * be called in probe itself.
+ */
+static s32 pruss_suart_request_port(struct uart_port *port)
+{
+	struct omapl_pru_suart *soft_uart =
+	    container_of(port, struct omapl_pru_suart, port[port->line]);
+	struct platform_device *pdev = to_platform_device(port->dev);
+	struct device *dev = soft_uart->dev;
+	struct suart_config pru_suart_config;
+	s16 timeout = 0;
+	u32 err = 0;
+
+	if (soft_uart == NULL) {
+		dev_err(&pdev->dev, "soft_uart ptr failed\n");
+		return -ENODEV;
+	}
+	err = pru_softuart_open(&soft_uart->suart_hdl[port->line]);
+	if (err != 0) {
+		dev_err(&pdev->dev, "failed to open suart: %d\n", err);
+		err = -ENODEV;
+		goto exit;
+	}
+	set_bit(0, &soft_uart->tx_empty[port->line]);
+
+	/* set fifo /timeout */
+	if (SUART_FIFO_TIMEOUT_MIN > suart_timeout) {
+		dev_err(&pdev->dev, "fifo timeout less than %d ms not supported\n",
+			    SUART_FIFO_TIMEOUT_MIN);
+		suart_timeout = SUART_FIFO_TIMEOUT_MIN;
+	} else if (SUART_FIFO_TIMEOUT_MAX < suart_timeout) {
+		dev_err(&pdev->dev, "fifo timeout more than %d ms not supported\n",
+			    SUART_FIFO_TIMEOUT_MAX);
+		suart_timeout = SUART_FIFO_TIMEOUT_MAX;
+	}
+
+	/* This is only for x8 */
+	timeout = (SUART_DEFAULT_BAUD * suart_timeout) / 1000;
+	pru_set_fifo_timeout(dev, timeout);
+
+	if (soft_uart->suart_hdl[port->line].uart_num == PRU_SUART_UART1) {
+		pru_suart_config.tx_serializer = PRU_SUART0_CONFIG_TX_SER;
+		pru_suart_config.rx_serializer = PRU_SUART0_CONFIG_RX_SER;
+	} else if (soft_uart->suart_hdl[port->line].uart_num ==
+							PRU_SUART_UART2) {
+		pru_suart_config.tx_serializer = PRU_SUART1_CONFIG_TX_SER;
+		pru_suart_config.rx_serializer = PRU_SUART1_CONFIG_RX_SER;
+	} else if (soft_uart->suart_hdl[port->line].uart_num ==
+							PRU_SUART_UART3) {
+		pru_suart_config.tx_serializer = PRU_SUART2_CONFIG_TX_SER;
+		pru_suart_config.rx_serializer = PRU_SUART2_CONFIG_RX_SER;
+	} else if (soft_uart->suart_hdl[port->line].uart_num ==
+							PRU_SUART_UART4) {
+		pru_suart_config.tx_serializer = PRU_SUART3_CONFIG_TX_SER;
+		pru_suart_config.rx_serializer = PRU_SUART3_CONFIG_RX_SER;
+	} else if (soft_uart->suart_hdl[port->line].uart_num ==
+							PRU_SUART_UART5) {
+		pru_suart_config.tx_serializer = PRU_SUART4_CONFIG_TX_SER;
+		pru_suart_config.rx_serializer = PRU_SUART4_CONFIG_RX_SER;
+	} else if (soft_uart->suart_hdl[port->line].uart_num ==
+							PRU_SUART_UART6) {
+		pru_suart_config.tx_serializer = PRU_SUART5_CONFIG_TX_SER;
+		pru_suart_config.rx_serializer = PRU_SUART5_CONFIG_RX_SER;
+	} else if (soft_uart->suart_hdl[port->line].uart_num ==
+							PRU_SUART_UART7) {
+		pru_suart_config.tx_serializer = PRU_SUART6_CONFIG_TX_SER;
+		pru_suart_config.rx_serializer = PRU_SUART6_CONFIG_RX_SER;
+	} else if (soft_uart->suart_hdl[port->line].uart_num ==
+							PRU_SUART_UART8) {
+		pru_suart_config.tx_serializer = PRU_SUART7_CONFIG_TX_SER;
+		pru_suart_config.rx_serializer = PRU_SUART7_CONFIG_RX_SER;
+	} else {
+		return -ENOTSUPP;
+	}
+
+	/* Some defaults to startup. reconfigured by terimos later */
+	pru_suart_config.tx_clk_divisor = 1;
+	pru_suart_config.rx_clk_divisor = 1;
+	pru_suart_config.tx_bits_per_char = ePRU_SUART_DATA_BITS8;
+	pru_suart_config.rx_bits_per_char = ePRU_SUART_DATA_BITS8;
+	pru_suart_config.oversampling = SUART_DEFAULT_OVRSMPL;
+
+	if (pru_softuart_setconfig(dev, &soft_uart->suart_hdl[port->line],
+			&pru_suart_config) != 0) {
+		dev_err(&pdev->dev,
+			"pru_softuart_setconfig: failed to set config: %X\n",
+			err);
+	}
+exit:
+	return err;
+}
+
+/*
+ * Perform any autoconfiguration steps required for the port.  `flag`
+ * contains a bit mask of the required configuration.  UART_CONFIG_TYPE
+ * indicates that the port requires detection and identification.
+ * port->type should be set to the type found, or PORT_UNKNOWN if
+ * no port was detected.
+ *
+ * UART_CONFIG_IRQ indicates autoconfiguration of the interrupt signal,
+ * which should be probed using standard kernel autoprobing techniques.
+ * This is not necessary on platforms where ports have interrupts
+ * internally hard wired (eg, system on a chip implementations).
+ *
+ * Locking: none.
+ * Interrupts: caller dependent.
+ */
+
+static void pruss_suart_config_port(struct uart_port *port, s32 flags)
+{
+	if (flags & UART_CONFIG_TYPE && pruss_suart_request_port(port) == 0)
+		port->type = PORT_DA8XX_PRU_SUART;
+}
+
+/*
+ * Verify the new serial port information contained within serinfo is
+ * suitable for this port type.
+ *
+ * Locking: none.
+ * Interrupts: caller dependent.
+ */
+static s32 pruss_suart_verify_port(struct uart_port *port,
+				 struct serial_struct *ser)
+{
+	struct omapl_pru_suart *soft_uart =
+	    container_of(port, struct omapl_pru_suart, port[port->line]);
+	s32 ret = 0;
+
+	if (ser->type != PORT_UNKNOWN && ser->type != PORT_DA8XX_PRU_SUART)
+		ret = -EINVAL;
+	if (soft_uart->port[port->line].irq != ser->irq)
+		ret = -EINVAL;
+	if (ser->io_type != UPIO_MEM)
+		ret = -EINVAL;
+	if (soft_uart->port[port->line].uartclk / 16 != ser->baud_base)
+		ret = -EINVAL;
+	if ((void *)soft_uart->port[port->line].mapbase != ser->iomem_base)
+		ret = -EINVAL;
+	if (soft_uart->port[port->line].iobase != ser->port)
+		ret = -EINVAL;
+	return ret;
+}
+
+static struct uart_ops pruss_suart_ops = {
+	.tx_empty	= pruss_suart_tx_empty,
+	.set_mctrl	= pruss_suart_set_mctrl,
+	.get_mctrl	= pruss_suart_get_mctrl,
+	.stop_tx	= pruss_suart_stop_tx,
+	.start_tx	= pruss_suart_start_tx,
+	.stop_rx	= pruss_suart_stop_rx,
+	.enable_ms	= pruss_suart_enable_ms,
+	.break_ctl	= pruss_suart_break_ctl,
+	.startup	= pruss_suart_startup,
+	.shutdown	= pruss_suart_shutdown,
+	.set_termios	= pruss_suart_set_termios,
+	.type		= pruss_suart_type,
+	.release_port	= pruss_suart_release_port,
+	.request_port	= pruss_suart_request_port,
+	.config_port	= pruss_suart_config_port,
+	.verify_port	= pruss_suart_verify_port,
+};
+
+static struct uart_driver pruss_suart_reg = {
+	.owner		= THIS_MODULE,
+	.driver_name	= DRV_NAME,
+	.dev_name	= "ttySU",
+	.major		= 0,
+	.minor		= 16,
+	.nr		= NR_SUART,
+};
+
+static struct pruss_suart_initparams init_params = {
+	.tx_baud_value	= SUART_DEFAULT_BAUD,
+	.rx_baud_value	= SUART_DEFAULT_BAUD,
+	.oversampling	= SUART_DEFAULT_OVRSMPL,
+};
+
+static s32 __devinit pruss_suart_probe(struct platform_device *pdev)
+{
+	struct omapl_pru_suart *soft_uart;
+	const struct da850_evm_pruss_suart_data *pdata;
+	struct device *dev = &pdev->dev;
+	struct resource *res;
+	struct clk *clk_pruss = NULL;
+	const struct firmware *fw;
+	s32 err, i;
+
+	pdata = dev->platform_data;
+	if (!pdata) {
+		dev_err(&pdev->dev, "platform data not found\n");
+		return -EINVAL;
+	}
+	(pdata->setup)();
+
+	soft_uart = kzalloc(sizeof(struct omapl_pru_suart), GFP_KERNEL);
+	if (!soft_uart)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "failed to get resource");
+		return -ENOMEM;
+	}
+
+	if (!request_mem_region(res->start,
+			resource_size(res),
+			dev_name(&pdev->dev))) {
+		dev_err(&pdev->dev, "mcasp memory region already claimed!\n");
+		err = -EBUSY;
+		goto probe_exit;
+	}
+
+	soft_uart->suart_iomap.mcasp_io_addr = ioremap(res->start,
+					resource_size(res));
+	if (!soft_uart->suart_iomap.mcasp_io_addr) {
+		dev_err(&pdev->dev, "mcasp ioremap failed\n");
+		err = -EFAULT;
+		goto probe_exit_1;
+	}
+
+	soft_uart->suart_iomap.p_fifo_buff_virt_base =
+	sram_alloc(SUART_CNTX_SZ * NR_SUART * 2,
+	(dma_addr_t *) &soft_uart->suart_iomap.p_fifo_buff_phys_base);
+	if (!soft_uart->suart_iomap.p_fifo_buff_virt_base)
+		goto probe_exit_iounmap;
+
+	clk_pruss = clk_get(NULL, "pruss");
+	if (IS_ERR(clk_pruss)) {
+		dev_err(&pdev->dev, "no clock available: pruss\n");
+		err = -ENODEV;
+		goto probe_exit_iounmap;
+	}
+	soft_uart->clk_freq_pru = clk_get_rate(clk_pruss);
+	clk_put(clk_pruss);
+
+	soft_uart->clk_mcasp = clk_get(&pdev->dev, NULL);
+	if (IS_ERR(soft_uart->clk_mcasp)) {
+		dev_err(&pdev->dev, "no clock available: mcasp\n");
+		err = -ENODEV;
+		soft_uart->clk_mcasp = NULL;
+		goto probe_exit_sram_free;
+	}
+
+	soft_uart->clk_freq_mcasp = clk_get_rate(soft_uart->clk_mcasp);
+	clk_enable(soft_uart->clk_mcasp);
+
+	err = request_firmware(&fw, "PRU_SUART_Emulation.bin",
+			       &pdev->dev);
+	if (err) {
+		dev_err(&pdev->dev, "can't load firmware\n");
+		err = -ENODEV;
+		goto probe_exit_clk;
+	}
+	dev_info(&pdev->dev, "fw size %td. downloading...\n", fw->size);
+
+	/* download firmware into pru  & init */
+	err = pru_softuart_init(dev, &init_params, fw->data, fw->size,
+					soft_uart->clk_freq_pru / 1000000,
+					&soft_uart->suart_iomap);
+	if (err) {
+		dev_err(&pdev->dev, "pruss init error\n");
+		err = -ENODEV;
+		goto probe_release_fw;
+	}
+	release_firmware(fw);
+
+	platform_set_drvdata(pdev, &soft_uart->port[0]);
+	soft_uart->dev = dev;
+
+	for (i = 0; i < NR_SUART; i++) {
+		soft_uart->port[i].ops = &pruss_suart_ops;
+		soft_uart->port[i].iotype = UPIO_MEM;
+		soft_uart->port[i].flags = UPF_BOOT_AUTOCONF | UPF_IOREMAP;
+		soft_uart->port[i].mapbase =
+			(u32)soft_uart->suart_iomap.p_fifo_buff_virt_base;
+		soft_uart->port[i].membase =
+			soft_uart->suart_iomap.mcasp_io_addr;
+		soft_uart->port[i].type = PORT_DA8XX_PRU_SUART;
+		soft_uart->port[i].irq =
+			platform_get_irq(to_platform_device(dev->parent), i);
+		soft_uart->port[i].dev = &pdev->dev;
+		soft_uart->port[i].irqflags = IRQF_SHARED;
+		soft_uart->port[i].uartclk = soft_uart->clk_freq_mcasp;
+		soft_uart->port[i].fifosize = SUART_FIFO_LEN;
+		soft_uart->tx_loadsz = SUART_FIFO_LEN;
+		soft_uart->port[i].custom_divisor = 1;
+		soft_uart->port[i].line = i;
+		soft_uart->suart_hdl[i].uart_num = i + 1;
+		soft_uart->port[i].serial_in = NULL;
+
+		soft_uart->suart_fifo_addr[i].fifo_vaddr_buff_tx =
+		soft_uart->suart_iomap.p_fifo_buff_virt_base +
+		(2 * SUART_CNTX_SZ * i);
+
+		soft_uart->suart_fifo_addr[i].fifo_vaddr_buff_rx =
+		soft_uart->suart_iomap.p_fifo_buff_virt_base +
+		((2 * SUART_CNTX_SZ * i) + SUART_CNTX_SZ);
+
+		soft_uart->suart_fifo_addr[i].fifo_phys_addr_tx =
+		soft_uart->suart_iomap.p_fifo_buff_phys_base +
+		(2 * SUART_CNTX_SZ * i);
+
+		soft_uart->suart_fifo_addr[i].fifo_phys_addr_rx =
+		soft_uart->suart_iomap.p_fifo_buff_phys_base +
+		((2 * SUART_CNTX_SZ * i) + SUART_CNTX_SZ);
+
+		soft_uart->port[i].serial_out = NULL;
+		tasklet_init(&soft_uart->tx_task[i], suart_tx_task,
+				(unsigned long)&soft_uart->port[i]);
+		uart_add_one_port(&pruss_suart_reg, &soft_uart->port[i]);
+	}
+
+	dev_info(&pdev->dev,
+		"%s device registered (pru_clk=%d, asp_clk=%d)\n",
+		DRV_NAME, soft_uart->clk_freq_pru, soft_uart->clk_freq_mcasp);
+
+	return 0;
+
+probe_release_fw:
+	release_firmware(fw);
+probe_exit_clk:
+	clk_put(soft_uart->clk_mcasp);
+	clk_disable(soft_uart->clk_mcasp);
+probe_exit_sram_free:
+	sram_free(soft_uart->suart_iomap.p_fifo_buff_virt_base,
+	SUART_CNTX_SZ * NR_SUART * 2);
+probe_exit_iounmap:
+	iounmap(soft_uart->suart_iomap.mcasp_io_addr);
+probe_exit_1:
+	release_mem_region(res->start,
+		resource_size(res));
+probe_exit:
+	kfree(soft_uart);
+	return err;
+}
+
+static s32 __devexit pruss_suart_remove(struct platform_device *pdev)
+{
+	struct omapl_pru_suart *soft_uart = platform_get_drvdata(pdev);
+	const struct da850_evm_pruss_suart_data *pdata;
+	struct device *dev = &pdev->dev;
+	struct resource *res;
+	int i;
+
+	pdata = dev->platform_data;
+	if (!pdata)
+		dev_err(&pdev->dev, "platform data not found\n");
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "failed to get resource");
+		return -ENOMEM;
+	}
+
+	platform_set_drvdata(pdev, NULL);
+
+	if (soft_uart) {
+		for (i = 0; i < NR_SUART; i++) {
+			uart_remove_one_port(&pruss_suart_reg,
+			&soft_uart->port[i]);
+		}
+	}
+
+	sram_free(soft_uart->suart_iomap.p_fifo_buff_virt_base,
+		SUART_CNTX_SZ * NR_SUART * 2);
+	clk_put(soft_uart->clk_mcasp);
+	pru_mcasp_deinit();
+	clk_disable(soft_uart->clk_mcasp);
+	iounmap(soft_uart->suart_iomap.mcasp_io_addr);
+	if (pdata) {
+		release_mem_region(res->start,
+			resource_size(res));
+	}
+	kfree(soft_uart);
+	return 0;
+}
+
+#define pruss_suart_suspend NULL
+#define pruss_suart_resume NULL
+
+static struct platform_driver serial_pruss_driver = {
+	.probe		= pruss_suart_probe,
+	.remove		= __devexit_p(pruss_suart_remove),
+	.suspend	= pruss_suart_suspend,
+	.resume		= pruss_suart_resume,
+	.driver		= {
+			.name	= DRV_NAME,
+			.owner	= THIS_MODULE,
+	},
+};
+
+static s32 __init pruss_suart_init(void)
+{
+	s32 ret;
+
+	pruss_suart_reg.nr = NR_SUART;
+	ret = uart_register_driver(&pruss_suart_reg);
+	if (ret)
+		return ret;
+	ret = platform_driver_register(&serial_pruss_driver);
+	if (ret)
+		goto out;
+
+	pr_debug("SUART serial driver loaded\n");
+	return ret;
+out:
+	uart_unregister_driver(&pruss_suart_reg);
+	return ret;
+}
+
+module_init(pruss_suart_init);
+
+static void __exit pruss_suart_exit(void)
+{
+	platform_driver_unregister(&serial_pruss_driver);
+	uart_unregister_driver(&pruss_suart_reg);
+	pr_debug("SUART serial driver unloaded\n");
+}
+
+module_exit(pruss_suart_exit);
+
+/* Module information */
+MODULE_AUTHOR("Subhasish Ghosh <subhasish@mistralsolutions.com>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION(DRV_DESC);
diff --git a/drivers/tty/serial/pruss_suart.h b/drivers/tty/serial/pruss_suart.h
new file mode 100644
index 0000000..f3a2a9d
--- /dev/null
+++ b/drivers/tty/serial/pruss_suart.h
@@ -0,0 +1,1038 @@
+/*
+ * Copyright (C) 2010, 2011 Texas Instruments Incorporated
+ * Author: Jitendra Kumar <jitendra@mistralsolutions.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as  published by the
+ * Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
+ * whether express or implied; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+
+#ifndef _SUART_API_H_
+#define _SUART_API_H_
+
+#include <linux/types.h>
+#include <linux/bitops.h>
+#include <linux/io.h>
+#include <linux/mfd/pruss.h>
+
+#define SINGLE_PRU			0
+#define BOTH_PRU			1
+#define PRU_ACTIVE			BOTH_PRU
+#define PRU_CLK_228			228
+#define PRU_CLK_186			186
+
+#define PRU_SUART_SERIALIZER_0		(0u)
+#define PRU_SUART_SERIALIZER_1		(1u)
+#define PRU_SUART_SERIALIZER_2		(2u)
+#define PRU_SUART_SERIALIZER_3		(3u)
+#define PRU_SUART_SERIALIZER_4		(4u)
+#define PRU_SUART_SERIALIZER_5		(5u)
+#define PRU_SUART_SERIALIZER_6		(6u)
+#define PRU_SUART_SERIALIZER_7		(7u)
+#define PRU_SUART_SERIALIZER_8		(8u)
+#define PRU_SUART_SERIALIZER_9		(9u)
+#define PRU_SUART_SERIALIZER_10		(10u)
+#define PRU_SUART_SERIALIZER_11		(11u)
+#define PRU_SUART_SERIALIZER_12		(12u)
+#define PRU_SUART_SERIALIZER_13		(13u)
+#define PRU_SUART_SERIALIZER_14		(14u)
+#define PRU_SUART_SERIALIZER_15		(15u)
+#define PRU_SUART_SERIALIZER_NONE	(16u)
+
+#define	PRU_SUART_UART1			(1u)
+#define	PRU_SUART_UART2			(2u)
+#define	PRU_SUART_UART3			(3u)
+#define	PRU_SUART_UART4			(4u)
+#define	PRU_SUART_UART5			(5u)
+#define	PRU_SUART_UART6			(6u)
+#define	PRU_SUART_UART7			(7u)
+#define PRU_SUART_UART8			(8u)
+#define PRU_SUART_UARTx_INVALID		(9u)
+
+#define PRU_SUART_HALF_TX		(1u)
+#define PRU_SUART_HALF_RX		(2u)
+#define PRU_SUART_HALF_TX_DISABLED	(4u)
+#define PRU_SUART_HALF_RX_DISABLED	(8u)
+
+#define PRU_SUART0_CONFIG_DUPLEX	(PRU_SUART_HALF_TX_DISABLED | \
+					PRU_SUART_HALF_RX_DISABLED)
+#define PRU_SUART0_CONFIG_RX_SER	(PRU_SUART_SERIALIZER_NONE)
+#define PRU_SUART0_CONFIG_TX_SER	(PRU_SUART_SERIALIZER_NONE)
+
+#define PRU_SUART1_CONFIG_DUPLEX	(PRU_SUART_HALF_TX | \
+					PRU_SUART_HALF_RX)
+#define PRU_SUART1_CONFIG_RX_SER	(PRU_SUART_SERIALIZER_7)
+#define PRU_SUART1_CONFIG_TX_SER	(PRU_SUART_SERIALIZER_8)
+
+#define PRU_SUART2_CONFIG_DUPLEX	(PRU_SUART_HALF_TX | \
+					PRU_SUART_HALF_RX)
+#define PRU_SUART2_CONFIG_RX_SER	(PRU_SUART_SERIALIZER_9)
+#define PRU_SUART2_CONFIG_TX_SER	(PRU_SUART_SERIALIZER_10)
+
+#define PRU_SUART3_CONFIG_DUPLEX	(PRU_SUART_HALF_TX | \
+					PRU_SUART_HALF_RX)
+#define PRU_SUART3_CONFIG_RX_SER	(PRU_SUART_SERIALIZER_13)
+#define PRU_SUART3_CONFIG_TX_SER	(PRU_SUART_SERIALIZER_14)
+
+#define PRU_SUART4_CONFIG_DUPLEX	(PRU_SUART_HALF_TX_DISABLED | \
+					PRU_SUART_HALF_RX_DISABLED)
+#define PRU_SUART4_CONFIG_RX_SER	(PRU_SUART_SERIALIZER_NONE)
+#define PRU_SUART4_CONFIG_TX_SER	(PRU_SUART_SERIALIZER_NONE)
+
+#define PRU_SUART5_CONFIG_DUPLEX	(PRU_SUART_HALF_TX_DISABLED | \
+					PRU_SUART_HALF_RX_DISABLED)
+#define PRU_SUART5_CONFIG_RX_SER	(PRU_SUART_SERIALIZER_NONE)
+#define PRU_SUART5_CONFIG_TX_SER	(PRU_SUART_SERIALIZER_NONE)
+
+#define PRU_SUART6_CONFIG_DUPLEX	(PRU_SUART_HALF_TX_DISABLED | \
+					PRU_SUART_HALF_RX_DISABLED)
+#define PRU_SUART6_CONFIG_RX_SER	(PRU_SUART_SERIALIZER_NONE)
+#define PRU_SUART6_CONFIG_TX_SER	(PRU_SUART_SERIALIZER_NONE)
+
+#define PRU_SUART7_CONFIG_DUPLEX	(PRU_SUART_HALF_TX_DISABLED | \
+					PRU_SUART_HALF_RX_DISABLED)
+#define PRU_SUART7_CONFIG_RX_SER	(PRU_SUART_SERIALIZER_NONE)
+#define PRU_SUART7_CONFIG_TX_SER	(PRU_SUART_SERIALIZER_NONE)
+
+#define SUART_NUM_OF_CHANNELS_PER_SUART		2
+#define SUART_NUM_OF_BYTES_PER_CHANNEL		16
+
+#define PRU_TX_INTR				1
+#define PRU_RX_INTR				2
+
+#define CHN_TXRX_STATUS_TIMEOUT			BIT(6)
+#define CHN_TXRX_STATUS_BI			BIT(5)
+#define CHN_TXRX_STATUS_FE			BIT(4)
+#define CHN_TXRX_STATUS_UNERR			BIT(3)
+#define CHN_TXRX_STATUS_OVRNERR			BIT(3)
+#define CHN_TXRX_STATUS_ERR			BIT(2)
+#define CHN_TXRX_STATUS_CMPLT			BIT(1)
+#define CHN_TXRX_STATUS_RDY			BIT(0)
+
+#define CHN_TXRX_IE_MASK_TIMEOUT		BIT(14)
+#define CHN_TXRX_IE_MASK_BI			BIT(13)
+#define CHN_TXRX_IE_MASK_FE			BIT(12)
+#define CHN_TXRX_IE_MASK_CMPLT			BIT(1)
+
+#define SUART_GBL_INTR_ERR_MASK			BIT(9)
+#define SUART_PRU_ID_MASK			0xFF
+
+#define SUART_FIFO_LEN				15
+#define SUART_8X_OVRSMPL			1
+#define SUART_16X_OVRSMPL			2
+#define SUART_TX_OVRSMPL			0
+#define SUART_DEFAULT_OVRSMPL			SUART_8X_OVRSMPL
+
+#define SUART_DEFAULT_OVRSMPL_OFFSET		26
+#define SUART_CHN_OFFSET			31
+#define SERIALIZER_OFFSET			8
+
+#if (SUART_DEFAULT_OVRSMPL == SUART_16X_OVRSMPL)
+#define SUART_DEFAULT_BAUD			57600
+#else
+#define SUART_DEFAULT_BAUD			115200
+#endif
+
+#define PRU_MODE_INVALID			0x0
+#define PRU_MODE_TX_ONLY			0x1
+#define PRU_MODE_RX_ONLY			0x2
+#define PRU_MODE_RX_TX_BOTH			0x3
+
+#if (PRU_ACTIVE == BOTH_PRU)
+#define PRU0_MODE				PRU_MODE_RX_ONLY
+#define PRU1_MODE				PRU_MODE_TX_ONLY
+#elif (PRU_ACTIVE ==  SINGLE_PRU)
+#define PRU0_MODE				PRU_MODE_RX_TX_BOTH
+#define PRU1_MODE				PRU_MODE_INVALID
+#else
+#define PRU0_MODE				PRU_MODE_INVALID
+#define PRU1_MODE				PRU_MODE_INVALID
+#endif
+
+#define MCASP_XBUF_BASE_ADDR			(0x01d00200)
+#define MCASP_RBUF_BASE_ADDR			(0x01d00280)
+#define MCASP_SRCTL_BASE_ADDR			(0x01d00180)
+
+#define MCASP_SRCTL_TX_MODE			(0x000D)
+#define MCASP_SRCTL_RX_MODE			(0x000E)
+
+/* Since only PRU0 can work as RX */
+#define RX_DEFAULT_DATA_DUMP_ADDR		(0x00001FC)
+#define PRU_NUM_OF_CHANNELS			(16)
+
+/* MCASP */
+
+#define OMAPL_MCASP_PFUNC_AFSR_MASK			(0x80000000u)
+#define OMAPL_MCASP_PFUNC_AFSR_SHIFT			(0x0000001Fu)
+#define OMAPL_MCASP_PFUNC_AFSR_RESETVAL			(0x00000000u)
+/* AFSR Tokens */
+#define OMAPL_MCASP_PFUNC_AFSR_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AFSR_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AHCLKR_MASK			(0x40000000u)
+#define OMAPL_MCASP_PFUNC_AHCLKR_SHIFT			(0x0000001Eu)
+#define OMAPL_MCASP_PFUNC_AHCLKR_RESETVAL		(0x00000000u)
+/* AHCLKR Tokens */
+#define OMAPL_MCASP_PFUNC_AHCLKR_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AHCLKR_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_ACLKR_MASK			(0x20000000u)
+#define OMAPL_MCASP_PFUNC_ACLKR_SHIFT			(0x0000001Du)
+#define OMAPL_MCASP_PFUNC_ACLKR_RESETVAL		(0x00000000u)
+/* ACLKR Tokens */
+#define OMAPL_MCASP_PFUNC_ACLKR_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_ACLKR_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AFSX_MASK			(0x10000000u)
+#define OMAPL_MCASP_PFUNC_AFSX_SHIFT			(0x0000001Cu)
+#define OMAPL_MCASP_PFUNC_AFSX_RESETVAL			(0x00000000u)
+/* AFSX Tokens */
+#define OMAPL_MCASP_PFUNC_AFSX_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AFSX_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AHCLKX_MASK			(0x08000000u)
+#define OMAPL_MCASP_PFUNC_AHCLKX_SHIFT			(0x0000001Bu)
+#define OMAPL_MCASP_PFUNC_AHCLKX_RESETVAL		(0x00000000u)
+/* AHCLKX Tokens */
+#define OMAPL_MCASP_PFUNC_AHCLKX_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AHCLKX_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_ACLKX_MASK			(0x04000000u)
+#define OMAPL_MCASP_PFUNC_ACLKX_SHIFT			(0x0000001Au)
+#define OMAPL_MCASP_PFUNC_ACLKX_RESETVAL		(0x00000000u)
+/* ACLKX Tokens */
+#define OMAPL_MCASP_PFUNC_ACLKX_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_ACLKX_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AMUTE_MASK			(0x02000000u)
+#define OMAPL_MCASP_PFUNC_AMUTE_SHIFT			(0x00000019u)
+#define OMAPL_MCASP_PFUNC_AMUTE_RESETVAL		(0x00000000u)
+/* AMUTE Tokens */
+#define OMAPL_MCASP_PFUNC_AMUTE_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AMUTE_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AXR15_MASK			(0x00008000u)
+#define OMAPL_MCASP_PFUNC_AXR15_SHIFT			(0x0000000Fu)
+#define OMAPL_MCASP_PFUNC_AXR15_RESETVAL		(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR15_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR15_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AXR14_MASK			(0x00004000u)
+#define OMAPL_MCASP_PFUNC_AXR14_SHIFT			(0x0000000Eu)
+#define OMAPL_MCASP_PFUNC_AXR14_RESETVAL		(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR14_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR14_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AXR13_MASK			(0x00002000u)
+#define OMAPL_MCASP_PFUNC_AXR13_SHIFT			(0x0000000Du)
+#define OMAPL_MCASP_PFUNC_AXR13_RESETVAL		(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR13_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR13_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AXR12_MASK			(0x00001000u)
+#define OMAPL_MCASP_PFUNC_AXR12_SHIFT			(0x0000000Cu)
+#define OMAPL_MCASP_PFUNC_AXR12_RESETVAL		(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR12_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR12_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AXR11_MASK			(0x00000800u)
+#define OMAPL_MCASP_PFUNC_AXR11_SHIFT			(0x0000000Bu)
+#define OMAPL_MCASP_PFUNC_AXR11_RESETVAL		(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR11_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR11_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AXR10_MASK			(0x00000400u)
+#define OMAPL_MCASP_PFUNC_AXR10_SHIFT			(0x0000000Au)
+#define OMAPL_MCASP_PFUNC_AXR10_RESETVAL		(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR10_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR10_GPIO			(0x00000001u)
+#define OMAPL_MCASP_PFUNC_AXR9_MASK			(0x00000200u)
+#define OMAPL_MCASP_PFUNC_AXR9_SHIFT			(0x00000009u)
+#define OMAPL_MCASP_PFUNC_AXR9_RESETVAL			(0x00000000u)
+/* AXR9 Token */
+#define OMAPL_MCASP_PFUNC_AXR9_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR9_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AXR8_MASK			(0x00000100u)
+#define OMAPL_MCASP_PFUNC_AXR8_SHIFT			(0x00000008u)
+#define OMAPL_MCASP_PFUNC_AXR8_RESETVAL			(0x00000000u)
+/* AXR8 Tokens */
+#define OMAPL_MCASP_PFUNC_AXR8_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR8_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AXR7_MASK			(0x00000080u)
+#define OMAPL_MCASP_PFUNC_AXR7_SHIFT			(0x00000007u)
+#define OMAPL_MCASP_PFUNC_AXR7_RESETVAL			(0x00000000u)
+/* AXR7 Tokens */
+#define OMAPL_MCASP_PFUNC_AXR7_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR7_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AXR6_MASK			(0x00000040u)
+#define OMAPL_MCASP_PFUNC_AXR6_SHIFT			(0x00000006u)
+#define OMAPL_MCASP_PFUNC_AXR6_RESETVAL			(0x00000000u)
+/* AXR6 Tokens */
+#define OMAPL_MCASP_PFUNC_AXR6_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR6_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AXR5_MASK			(0x00000020u)
+#define OMAPL_MCASP_PFUNC_AXR5_SHIFT			(0x00000005u)
+#define OMAPL_MCASP_PFUNC_AXR5_RESETVAL			(0x00000000u)
+/* AXR5 Tokens */
+#define OMAPL_MCASP_PFUNC_AXR5_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR5_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AXR4_MASK			(0x00000010u)
+#define OMAPL_MCASP_PFUNC_AXR4_SHIFT			(0x00000004u)
+#define OMAPL_MCASP_PFUNC_AXR4_RESETVAL			(0x00000000u)
+/* AXR4 Tokens */
+#define OMAPL_MCASP_PFUNC_AXR4_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR4_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AXR3_MASK			(0x00000008u)
+#define OMAPL_MCASP_PFUNC_AXR3_SHIFT			(0x00000003u)
+#define OMAPL_MCASP_PFUNC_AXR3_RESETVAL			(0x00000000u)
+/* AXR3 Tokens */
+#define OMAPL_MCASP_PFUNC_AXR3_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR3_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AXR2_MASK			(0x00000004u)
+#define OMAPL_MCASP_PFUNC_AXR2_SHIFT			(0x00000002u)
+#define OMAPL_MCASP_PFUNC_AXR2_RESETVAL			(0x00000000u)
+/* AXR2 Tokens */
+#define OMAPL_MCASP_PFUNC_AXR2_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR2_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AXR1_MASK			(0x00000002u)
+#define OMAPL_MCASP_PFUNC_AXR1_SHIFT			(0x00000001u)
+#define OMAPL_MCASP_PFUNC_AXR1_RESETVAL			(0x00000000u)
+/* AXR1 Tokens */
+#define OMAPL_MCASP_PFUNC_AXR1_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR1_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AXR0_MASK			(0x00000001u)
+#define OMAPL_MCASP_PFUNC_AXR0_SHIFT			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR0_RESETVAL			(0x00000000u)
+/* AXR0 Tokens */
+#define OMAPL_MCASP_PFUNC_AXR0_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR0_GPIO			(0x00000001u)
+#define OMAPL_MCASP_PFUNC_RESETVAL			(0x00000000u)
+
+#define OMAPL_MCASP_PDIR_AFSR_MASK			(0x80000000u)
+#define OMAPL_MCASP_PDIR_AFSR_SHIFT			(0x0000001Fu)
+#define OMAPL_MCASP_PDIR_AFSR_RESETVAL			(0x00000000u)
+/* AFSR Tokens */
+#define OMAPL_MCASP_PDIR_AFSR_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AFSR_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AHCLKR_MASK			(0x40000000u)
+#define OMAPL_MCASP_PDIR_AHCLKR_SHIFT			(0x0000001Eu)
+#define OMAPL_MCASP_PDIR_AHCLKR_RESETVAL		(0x00000000u)
+/* AHCLKR Tokens */
+#define OMAPL_MCASP_PDIR_AHCLKR_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AHCLKR_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_ACLKR_MASK			(0x20000000u)
+#define OMAPL_MCASP_PDIR_ACLKR_SHIFT			(0x0000001Du)
+#define OMAPL_MCASP_PDIR_ACLKR_RESETVAL			(0x00000000u)
+/* ACLKR Tokens */
+#define OMAPL_MCASP_PDIR_ACLKR_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_ACLKR_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AFSX_MASK			(0x10000000u)
+#define OMAPL_MCASP_PDIR_AFSX_SHIFT			(0x0000001Cu)
+#define OMAPL_MCASP_PDIR_AFSX_RESETVAL			(0x00000000u)
+/* AFSX Tokens */
+#define OMAPL_MCASP_PDIR_AFSX_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AFSX_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AHCLKX_MASK			(0x08000000u)
+#define OMAPL_MCASP_PDIR_AHCLKX_SHIFT			(0x0000001Bu)
+#define OMAPL_MCASP_PDIR_AHCLKX_RESETVAL		(0x00000000u)
+/* AHCLKX Tokens */
+#define OMAPL_MCASP_PDIR_AHCLKX_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AHCLKX_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_ACLKX_MASK			(0x04000000u)
+#define OMAPL_MCASP_PDIR_ACLKX_SHIFT			(0x0000001Au)
+#define OMAPL_MCASP_PDIR_ACLKX_RESETVAL			(0x00000000u)
+/* ACLKX Tokens */
+#define OMAPL_MCASP_PDIR_ACLKX_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_ACLKX_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AMUTE_MASK			(0x02000000u)
+#define OMAPL_MCASP_PDIR_AMUTE_SHIFT			(0x00000019u)
+#define OMAPL_MCASP_PDIR_AMUTE_RESETVAL			(0x00000000u)
+/* AMUTE Tokens */
+#define OMAPL_MCASP_PDIR_AMUTE_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AMUTE_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AXR15_MASK			(0x00008000u)
+#define OMAPL_MCASP_PDIR_AXR15_SHIFT			(0x0000000Fu)
+#define OMAPL_MCASP_PDIR_AXR15_RESETVAL			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR15_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR15_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AXR14_MASK			(0x00004000u)
+#define OMAPL_MCASP_PDIR_AXR14_SHIFT			(0x0000000Eu)
+#define OMAPL_MCASP_PDIR_AXR14_RESETVAL			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR14_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR14_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AXR13_MASK			(0x00002000u)
+#define OMAPL_MCASP_PDIR_AXR13_SHIFT			(0x0000000Du)
+#define OMAPL_MCASP_PDIR_AXR13_RESETVAL			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR13_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR13_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AXR12_MASK			(0x00001000u)
+#define OMAPL_MCASP_PDIR_AXR12_SHIFT			(0x0000000Cu)
+#define OMAPL_MCASP_PDIR_AXR12_RESETVAL			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR12_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR12_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AXR11_MASK			(0x00000800u)
+#define OMAPL_MCASP_PDIR_AXR11_SHIFT			(0x0000000Bu)
+#define OMAPL_MCASP_PDIR_AXR11_RESETVAL			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR11_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR11_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AXR10_MASK			(0x00000400u)
+#define OMAPL_MCASP_PDIR_AXR10_SHIFT			(0x0000000Au)
+#define OMAPL_MCASP_PDIR_AXR10_RESETVAL			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR10_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR10_OUTPUT			(0x00000001u)
+#define OMAPL_MCASP_PDIR_AXR9_MASK			(0x00000200u)
+#define OMAPL_MCASP_PDIR_AXR9_SHIFT			(0x00000009u)
+#define OMAPL_MCASP_PDIR_AXR9_RESETVAL			(0x00000000u)
+/* AXR9 Tokens */
+#define OMAPL_MCASP_PDIR_AXR9_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR9_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AXR8_MASK			(0x00000100u)
+#define OMAPL_MCASP_PDIR_AXR8_SHIFT			(0x00000008u)
+#define OMAPL_MCASP_PDIR_AXR8_RESETVAL			(0x00000000u)
+/* AXR8 Tokens */
+#define OMAPL_MCASP_PDIR_AXR8_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR8_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AXR7_MASK			(0x00000080u)
+#define OMAPL_MCASP_PDIR_AXR7_SHIFT			(0x00000007u)
+#define OMAPL_MCASP_PDIR_AXR7_RESETVAL			(0x00000000u)
+/*----AXR7 Tokens----*/
+#define OMAPL_MCASP_PDIR_AXR7_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR7_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AXR6_MASK			(0x00000040u)
+#define OMAPL_MCASP_PDIR_AXR6_SHIFT			(0x00000006u)
+#define OMAPL_MCASP_PDIR_AXR6_RESETVAL			(0x00000000u)
+/*----AXR6 Tokens----*/
+#define OMAPL_MCASP_PDIR_AXR6_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR6_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AXR5_MASK			(0x00000020u)
+#define OMAPL_MCASP_PDIR_AXR5_SHIFT			(0x00000005u)
+#define OMAPL_MCASP_PDIR_AXR5_RESETVAL			(0x00000000u)
+/*----AXR5 Tokens----*/
+#define OMAPL_MCASP_PDIR_AXR5_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR5_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AXR4_MASK			(0x00000010u)
+#define OMAPL_MCASP_PDIR_AXR4_SHIFT			(0x00000004u)
+#define OMAPL_MCASP_PDIR_AXR4_RESETVAL			(0x00000000u)
+/*----AXR4 Tokens----*/
+#define OMAPL_MCASP_PDIR_AXR4_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR4_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AXR3_MASK			(0x00000008u)
+#define OMAPL_MCASP_PDIR_AXR3_SHIFT			(0x00000003u)
+#define OMAPL_MCASP_PDIR_AXR3_RESETVAL			(0x00000000u)
+/*----AXR3 Tokens----*/
+#define OMAPL_MCASP_PDIR_AXR3_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR3_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AXR2_MASK			(0x00000004u)
+#define OMAPL_MCASP_PDIR_AXR2_SHIFT			(0x00000002u)
+#define OMAPL_MCASP_PDIR_AXR2_RESETVAL			(0x00000000u)
+/*----AXR2 Tokens----*/
+#define OMAPL_MCASP_PDIR_AXR2_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR2_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AXR1_MASK			(0x00000002u)
+#define OMAPL_MCASP_PDIR_AXR1_SHIFT			(0x00000001u)
+#define OMAPL_MCASP_PDIR_AXR1_RESETVAL			(0x00000000u)
+/*----AXR1 Tokens----*/
+#define OMAPL_MCASP_PDIR_AXR1_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR1_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AXR0_MASK			(0x00000001u)
+#define OMAPL_MCASP_PDIR_AXR0_SHIFT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR0_RESETVAL			(0x00000000u)
+/*----AXR0 Tokens----*/
+#define OMAPL_MCASP_PDIR_AXR0_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR0_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_RESETVAL			(0x00000000u)
+
+#define OMAPL_MCASP_ACLKXCTL_CLKXP_MASK			(0x00000080u)
+#define OMAPL_MCASP_ACLKXCTL_CLKXP_SHIFT		(0x00000007u)
+#define OMAPL_MCASP_ACLKXCTL_CLKXP_RESETVAL		(0x00000000u)
+/*----CLKXP Tokens----*/
+#define OMAPL_MCASP_ACLKXCTL_CLKXP_RISINGEDGE		(0x00000000u)
+#define OMAPL_MCASP_ACLKXCTL_CLKXP_FALLINGEDGE		(0x00000001u)
+
+#define OMAPL_MCASP_ACLKXCTL_ASYNC_MASK			(0x00000040u)
+#define OMAPL_MCASP_ACLKXCTL_ASYNC_SHIFT		(0x00000006u)
+#define OMAPL_MCASP_ACLKXCTL_ASYNC_RESETVAL		(0x00000001u)
+/*----ASYNC Tokens----*/
+#define OMAPL_MCASP_ACLKXCTL_ASYNC_SYNC			(0x00000000u)
+#define OMAPL_MCASP_ACLKXCTL_ASYNC_ASYNC		(0x00000001u)
+
+#define OMAPL_MCASP_ACLKXCTL_CLKXM_MASK			(0x00000020u)
+#define OMAPL_MCASP_ACLKXCTL_CLKXM_SHIFT		(0x00000005u)
+#define OMAPL_MCASP_ACLKXCTL_CLKXM_RESETVAL		(0x00000001u)
+/*----CLKXM Tokens----*/
+#define OMAPL_MCASP_ACLKXCTL_CLKXM_EXTERNAL		(0x00000000u)
+#define OMAPL_MCASP_ACLKXCTL_CLKXM_INTERNAL		(0x00000001u)
+
+#define OMAPL_MCASP_ACLKXCTL_CLKXDIV_MASK		(0x0000001Fu)
+#define OMAPL_MCASP_ACLKXCTL_CLKXDIV_SHIFT		(0x00000000u)
+#define OMAPL_MCASP_ACLKXCTL_CLKXDIV_RESETVAL		(0x00000000u)
+
+#define OMAPL_MCASP_ACLKXCTL_RESETVAL			(0x00000060u)
+
+/* AHCLKXCTL */
+#define OMAPL_MCASP_AHCLKXCTL_HCLKXM_MASK		(0x00008000u)
+#define OMAPL_MCASP_AHCLKXCTL_HCLKXM_SHIFT		(0x0000000Fu)
+#define OMAPL_MCASP_AHCLKXCTL_HCLKXM_RESETVAL		(0x00000001u)
+/*----HCLKXM Tokens----*/
+#define OMAPL_MCASP_AHCLKXCTL_HCLKXM_EXTERNAL		(0x00000000u)
+#define OMAPL_MCASP_AHCLKXCTL_HCLKXM_INTERNAL		(0x00000001u)
+
+#define OMAPL_MCASP_AHCLKXCTL_HCLKXP_MASK		(0x00004000u)
+#define OMAPL_MCASP_AHCLKXCTL_HCLKXP_SHIFT		(0x0000000Eu)
+#define OMAPL_MCASP_AHCLKXCTL_HCLKXP_RESETVAL		(0x00000000u)
+/*----HCLKXP Tokens----*/
+#define OMAPL_MCASP_AHCLKXCTL_HCLKXP_NOTINVERTED	(0x00000000u)
+#define OMAPL_MCASP_AHCLKXCTL_HCLKXP_INVERTED		(0x00000001u)
+
+#define OMAPL_MCASP_AHCLKXCTL_HCLKXDIV_MASK		(0x00000FFFu)
+#define OMAPL_MCASP_AHCLKXCTL_HCLKXDIV_SHIFT		(0x00000000u)
+#define OMAPL_MCASP_AHCLKXCTL_HCLKXDIV_RESETVAL		(0x00000000u)
+
+#define OMAPL_MCASP_AHCLKXCTL_RESETVAL			(0x00008000u)
+
+#define MCASP_SUART_GBLCTL				(0X00000000)
+#define MCASP_SUART_RGBLCTL				(0X00000000)
+#define MCASP_SUART_XGBLCTL				(0X00000000)
+#define MCASP_SUART_RMASK_8				(0x000000FF)
+#define MCASP_SUART_RMASK_16				(0x0000FFFF)
+#define MCASP_SUART_RFMT_8				(0x0000A038)
+#define MCASP_SUART_RFMT_16				(0x0000A078)
+#define MCASP_SUART_FSRM				(0X00000002)
+#define MCASP_SUART_CLKRM_CLKRP				(0X000000A0)
+#define MCASP_SUART_HCLKRP				(0X00008000)
+#define MCASP_SUART_RTDMS0				(0X00000001)
+#define MCASP_SUART_RSYNCERR				(0X00000002)
+#define MCASP_SUART_RMAX_RPS_256			(0x00FF0008)
+#define MCASP_SUART_XMASK_0_31				(0X0000FFFF)
+#define MCASP_SUART_XBUSEL_XSSZ_16_XPAD_0		(0x00002078)
+#define MCASP_SUART_FSXM				(0x00000002)
+#define MCASP_SUART_CLKXM_ASYNC_CLKXP			(0x000000E0)
+#define MCASP_SUART_HCLKXM				(0x00008000)
+#define MCASP_SUART_XTDMS0				(0X00000001)
+#define MCASP_SUART_XSYNCERR				(0x00000002)
+#define MCASP_SUART_XMAX_XPS_256			(0x00FF0008)
+#define MCASP_SUART_SRCTL_DISMOD			(0x0000000c)
+#define MCASP_SUART_DIT_DISABLE				(0X00000000)
+#define MCASP_SUART_LOOPBACK_DISABLE			(0x00000000)
+#define MCASP_SUART_AMUTE_DISABLE			(0X00000000)
+#define MCASP_SUART_XSTAT				(0x0000FFFF)
+#define MCASP_SUART_RSTAT				(0x0000FFFF)
+
+/* SUART REGS */
+
+/* PRU0 DATA RAM base address */
+#define PRU0_DATARAM_OFFSET		(0x0000u)
+/* PRU1 DATA RAM base address */
+#define PRU1_DATARAM_OFFSET		(0x2000u)
+
+/* PRU0 DATA RAM size */
+#define PRU0_DATARAM_SIZE		(0x200u)
+/* PRU1 DATA RAM size */
+#define PRU1_DATARAM_SIZE		(0x200u)
+
+#define PRU_SUART_PRU0_CH0_OFFSET	(0x0000)
+#define PRU_SUART_PRU0_CH1_OFFSET	(0x0010)
+#define PRU_SUART_PRU0_CH2_OFFSET	(0x0020)
+#define PRU_SUART_PRU0_CH3_OFFSET	(0x0030)
+#define PRU_SUART_PRU0_CH4_OFFSET	(0x0040)
+#define PRU_SUART_PRU0_CH5_OFFSET	(0x0050)
+#define PRU_SUART_PRU0_CH6_OFFSET	(0x0060)
+#define PRU_SUART_PRU0_CH7_OFFSET	(0x0070)
+#define PRU_SUART_PRU0_IMR_OFFSET	(0x0080)
+/* Interrupt Mask Register */
+#define PRU_SUART_PRU0_ISR_OFFSET	(0x0082)
+/* Interrupt Status Register */
+#define PRU_SUART_PRU0_ID_ADDR		(0x0084)
+/* PRU ID Register */
+#define PRU_SUART_PRU0_RX_TX_MODE	(0x0085)
+#define PRU_SUART_PRU0_DELAY_OFFSET	(0x0086)
+#define PRU_SUART_PRU0_IDLE_TIMEOUT_OFFSET	(0x0088)
+
+/* PRU 1 Macros */
+#define PRU_SUART_PRU1_CH0_OFFSET	(0x2000)
+#define PRU_SUART_PRU1_CH1_OFFSET	(0x2010)
+#define PRU_SUART_PRU1_CH2_OFFSET	(0x2020)
+#define PRU_SUART_PRU1_CH3_OFFSET	(0x2030)
+#define PRU_SUART_PRU1_CH4_OFFSET	(0x2040)
+#define PRU_SUART_PRU1_CH5_OFFSET	(0x2050)
+#define PRU_SUART_PRU1_CH6_OFFSET	(0x2060)
+#define PRU_SUART_PRU1_CH7_OFFSET	(0x2070)
+#define PRU_SUART_PRU1_IMR_OFFSET	(0x2080)
+#define PRU_SUART_PRU1_ISR_OFFSET	(0x2082)
+#define PRU_SUART_PRU1_ID_ADDR		(0x2084)
+#define PRU_SUART_PRU1_RX_TX_MODE	(0x2085)
+#define PRU_SUART_PRU1_DELAY_OFFSET	(0x2086)
+#define PRU_SUART_PRU1_IDLE_TIMEOUT_OFFSET	(0x2088)
+
+/* SUART Channel Control Register bit descriptions */
+#define PRU_SUART_CH_CTRL_MODE_SHIFT		0x0000
+#define PRU_SUART_CH_CTRL_MODE_MASK		0x0003
+#define PRU_SUART_CH_CTRL_TX_MODE		0x0001
+#define PRU_SUART_CH_CTRL_RX_MODE		0x0002
+
+/* Service Request */
+#define PRU_SUART_CH_CTRL_SREQ_SHIFT		0x0002
+#define PRU_SUART_CH_CTRL_SREQ_MASK		0x0004
+#define PRU_SUART_CH_CTRL_SREQ			0x0001
+
+/* McASP Instance */
+#define PRU_SUART_CH_CTRL_MCASP_SHIFT		0x0003
+#define PRU_SUART_CH_CTRL_MCASP_MASK		0x0018
+#define PRU_SUART_CH_CTRL_SR_SHIFT		0x0008
+#define PRU_SUART_CH_CTRL_SR_MASK		0x0F00
+
+/* SUART channel configuration1 register descriptions */
+
+/* clock divisor -  relative baud value */
+#define PRU_SUART_CH_CONFIG1_DIVISOR_SHIFT	0x0000
+#define PRU_SUART_CH_CONFIG1_DIVISOR_MASK	0x03FF
+/* oversampling */
+#define PRU_SUART_CH_CONFIG1_OVS_SHIFT		0x000A
+#define PRU_SUART_CH_CONFIG1_OVS_MASK		0x0C00
+
+/* SUART channel configuration2 register descriptions */
+/* Bits per character */
+#define PRU_SUART_CH_CONFIG2_BITPERCHAR_SHIFT	0x0000
+#define PRU_SUART_CH_CONFIG2_BITPERCHAR_MASK	0x000F
+
+/* Bits per character */
+#define PRU_SUART_CH_CONFIG2_DATALEN_SHIFT	0x0008
+#define PRU_SUART_CH_CONFIG2_DATALEN_MASK	0x0F00
+
+/* SUART Channel STATUS Register*/
+#define PRU_SUART_CH_STATUS_EN_BIT_MASK		0x8000
+
+/* SUART Channel register offsets */
+#define PRU_SUART_CH_CTRL_OFFSET		0x00
+#define PRU_SUART_CH_CONFIG1_OFFSET		0x02
+#define PRU_SUART_CH_CONFIG2_OFFSET		0x04
+#define PRU_SUART_CH_TXRXSTATUS_OFFSET		0x06
+#define PRU_SUART_CH_TXRXDATA_OFFSET		0x08
+#define PRU_SUART_CH_BYTESDONECNTR_OFFSET	0x0C
+
+/* SUART Event Numbers macros */
+#define PRU_SUART0_TX_EVT	34
+#define PRU_SUART0_RX_EVT	35
+#define PRU_SUART1_TX_EVT	36
+#define PRU_SUART1_RX_EVT	37
+#define PRU_SUART2_TX_EVT	38
+#define PRU_SUART2_RX_EVT	39
+#define PRU_SUART3_TX_EVT	40
+#define PRU_SUART3_RX_EVT	41
+#define PRU_SUART4_TX_EVT	42
+#define PRU_SUART4_RX_EVT	43
+#define PRU_SUART5_TX_EVT	44
+#define PRU_SUART5_RX_EVT	45
+#define PRU_SUART6_TX_EVT	46
+#define PRU_SUART6_RX_EVT	47
+#define PRU_SUART7_TX_EVT	48
+#define PRU_SUART7_RX_EVT	49
+
+#define PRU_SUART0_TX_EVT_BIT	BIT(2)
+#define PRU_SUART0_RX_EVT_BIT	BIT(3)
+#define PRU_SUART1_TX_EVT_BIT	BIT(4)
+#define PRU_SUART1_RX_EVT_BIT	BIT(5)
+#define PRU_SUART2_TX_EVT_BIT	BIT(6)
+#define PRU_SUART2_RX_EVT_BIT	BIT(7)
+#define PRU_SUART3_TX_EVT_BIT	BIT(8)
+#define PRU_SUART3_RX_EVT_BIT	BIT(9)
+#define PRU_SUART4_TX_EVT_BIT	BIT(10)
+#define PRU_SUART4_RX_EVT_BIT	BIT(11)
+#define PRU_SUART5_TX_EVT_BIT	BIT(12)
+#define PRU_SUART5_RX_EVT_BIT	BIT(13)
+#define PRU_SUART6_TX_EVT_BIT	BIT(14)
+#define PRU_SUART6_RX_EVT_BIT	BIT(15)
+#define PRU_SUART7_TX_EVT_BIT	BIT(16)
+#define PRU_SUART7_RX_EVT_BIT	BIT(17)
+
+/* Total number of baud rates supported */
+#define SUART_NUM_OF_BAUDS_SUPPORTED	13
+
+#define MCASP_PDIR_VAL ( \
+	OMAPL_MCASP_PDIR_AFSR_OUTPUT<<OMAPL_MCASP_PDIR_AFSR_SHIFT | \
+	OMAPL_MCASP_PDIR_AHCLKR_OUTPUT<<OMAPL_MCASP_PDIR_AHCLKR_SHIFT | \
+	OMAPL_MCASP_PDIR_ACLKR_OUTPUT<<OMAPL_MCASP_PDIR_ACLKR_SHIFT | \
+	OMAPL_MCASP_PDIR_AFSX_OUTPUT<<OMAPL_MCASP_PDIR_AFSX_SHIFT | \
+	OMAPL_MCASP_PDIR_AHCLKX_OUTPUT<<OMAPL_MCASP_PDIR_AHCLKX_SHIFT | \
+	OMAPL_MCASP_PDIR_ACLKX_OUTPUT<<OMAPL_MCASP_PDIR_ACLKX_SHIFT)
+
+/*
+ *  This enum is used to specify the direction of the channel in UART
+ */
+enum SUART_CHN_DIR {
+	SUART_CHN_TX = 1,
+	SUART_CHN_RX = 2
+};
+
+/*
+ *  This enum is used to specify the state of the channel in UART. It
+ *  is either enabled or disabled.
+ */
+enum SUART_CHN_STATE {
+	SUART_CHN_DISABLED = 0,
+	SUART_CHN_ENABLED = 1
+};
+
+enum SUART_EN_BITSPERCHAR {
+	ePRU_SUART_DATA_BITS6 = 8,
+	ePRU_SUART_DATA_BITS7,
+	ePRU_SUART_DATA_BITS8,
+	ePRU_SUART_DATA_BITS9,
+	ePRU_SUART_DATA_BITS10,
+	ePRU_SUART_DATA_BITS11,
+	ePRU_SUART_DATA_BITS12
+};
+
+enum SUART_EN_UARTNUM {
+	ePRU_SUART_NUM_1 = 1,
+	ePRU_SUART_NUM_2,
+	ePRU_SUART_NUM_3,
+	ePRU_SUART_NUM_4,
+	ePRU_SUART_NUM_5,
+	ePRU_SUART_NUM_6,
+	ePRU_SUART_NUM_7,
+	ePRU_SUART_NUM_8
+};
+
+enum SUART_EN_UARTTYPE {
+	ePRU_SUART_HALF_TX = 1,
+	ePRU_SUART_HALF_RX,
+	ePRU_SUART_FULL_TX_RX,
+	ePRU_SUART_HALF_TX_DISABLED = 4,
+	ePRU_SUART_HALF_RX_DISABLED = 8
+};
+
+enum SUART_EN_TXCHANNEL {
+	ePRU_SUART_TX_CH0 = 0,
+	ePRU_SUART_TX_CH1,
+	ePRU_SUART_TX_CH2,
+	ePRU_SUART_TX_CH3,
+	ePRU_SUART_TX_CH4,
+	ePRU_SUART_TX_CH5,
+	ePRU_SUART_TX_CH6,
+	ePRU_SUART_TX_CH7
+};
+
+enum SUART_EN_RXCHANNEL {
+	ePRU_SUART_RX_CH0 = 0,
+	ePRU_SUART_RX_CH1,
+	ePRU_SUART_RX_CH2,
+	ePRU_SUART_RX_CH3,
+	ePRU_SUART_RX_CH4,
+	ePRU_SUART_RX_CH5,
+	ePRU_SUART_RX_CH6,
+	ePRU_SUART_RX_CH7
+};
+
+enum SUART_EN_UART_STATUS {
+	ePRU_SUART_UART_FREE = 0,
+	ePRU_SUART_UART_IN_USE
+};
+
+struct pru_suart_cnh_cntrl_config1 {
+	u32 mode:2;
+	u32 service_req:1;
+	u32 asp_id:2;
+	u32 reserved1:3;
+	u32 serializer_num:4;
+	u32 reserved2:4;
+	u32 presacler:10;
+	u32 over_sampling:2;
+	u32 framing_mask:1;
+	u32 break_mask:1;
+	u32 timeout_mask:1;
+	u32 reserved3:1;
+};
+
+struct pru_suart_chn_config2_status {
+	u32 bits_per_char:4;
+	u32 reserved1:4;
+	u32 data_len:4;
+	u32 reserved2:4;
+	u32 txrx_ready:1;
+	u32 txrx_complete:1;
+	u32 txrx_error:1;
+	u32 txrx_underrun:1;
+	u32 framing_error:1;
+	u32 break_error:1;
+	u32 timeout_error:1;
+	u32 reserved3:8;
+	u32 chn_state:1;
+};
+
+struct pru_suart_regs_ovly {
+	struct pru_suart_cnh_cntrl_config1 ch_ctrl_config1;
+	struct pru_suart_chn_config2_status ch_config2_txrx_status;
+	u32 ch_txrx_data;
+	u32 reserved1;
+};
+
+struct pru_suart_tx_cntx_priv {
+	u32 asp_xsrctl_base;
+	u32 asp_xbuf_base;
+	u16 buff_addr;
+	u8 buff_size;
+	u8 bits_loaded;
+};
+
+struct pru_suart_rx_cntx_priv {
+	u32 asp_rbuf_base;
+	u32 asp_rsrctl_base;
+	u32 reserved1;
+	u32 reserved2;
+	u32 reserved3;
+	u32 reserved4;
+};
+
+struct suart_config {
+	u8  tx_serializer;
+	u8  rx_serializer;
+	u16 tx_clk_divisor;
+	u16 rx_clk_divisor;
+	u8  tx_bits_per_char;
+	u8  rx_bits_per_char;
+	u8  oversampling;
+	u8  bi_inter_mask;
+	u8  fe_intr_mask;
+};
+
+struct suart_handle {
+	u16 uart_num;
+	u16 uart_type;
+	u16 uart_tx_channel;
+	u16 uart_rx_channel;
+	u16 uart_status;
+};
+
+struct pruss_suart_iomap {
+	void __iomem *mcasp_io_addr;
+	void *p_fifo_buff_phys_base;
+	void *p_fifo_buff_virt_base;
+};
+
+struct pruss_suart_initparams {
+	u32 tx_baud_value;
+	u32 rx_baud_value;
+	u32 oversampling;
+};
+
+/* MCASP */
+struct omapl_mcasp_regs_ovly {
+	u32 revid;
+	u32 rsvd0[3];
+	u32 pfunc;
+	u32 pdir;
+	u32 pdout;
+	u32 pdin;
+	u32 pdclr;
+	u32 rsvd1[8];
+	u32 gblctl;
+	u32 amute;
+	u32 dlbctl;
+	u32 ditctl;
+	u32 rsvd2[3];
+	u32 rgblctl;
+	u32 rmask;
+	u32 rfmt;
+	u32 afsrctl;
+	u32 aclkrctl;
+	u32 ahclkrctl;
+	u32 rtdm;
+	u32 rintctl;
+	u32 rstat;
+	u32 rslot;
+	u32 rclkchk;
+	u32 revtctl;
+	u32 rsvd3[4];
+	u32 xgblctl;
+	u32 xmask;
+	u32 xfmt;
+	u32 afsxctl;
+	u32 aclkxctl;
+	u32 ahclkxctl;
+	u32 xtdm;
+	u32 xintctl;
+	u32 xstat;
+	u32 xslot;
+	u32 xclkchk;
+	u32 xevtctl;
+	u32 rsvd4[12];
+	u32 ditcsra[6];
+	u32 ditcsrb[6];
+	u32 ditudra[6];
+	u32 ditudrb[6];
+	u32 rsvd5[8];
+	u32 srctl0;
+	u32 srctl1;
+	u32 srctl2;
+	u32 srctl3;
+	u32 srctl4;
+	u32 srctl5;
+	u32 srctl6;
+	u32 srctl7;
+	u32 srctl8;
+	u32 srctl9;
+	u32 srctl10;
+	u32 srctl11;
+	u32 srctl12;
+	u32 srctl13;
+	u32 srctl14;
+	u32 srctl15;
+	u32 rsvd6[16];
+	u32 xbuf[16];
+	u32 rsvd7[16];
+	u32 rbuf[16];
+};
+
+/*
+ *  SUART Config regs
+ */
+struct suart_struct_pru_regs {
+	u16 chn_ctrl;
+	u16 chn_config1;
+	u16 chn_config2;
+	u16 chn_txrx_status;
+	u32 chn_txrx_data;
+};
+
+extern s32 pru_softuart_init(struct device *dev,
+			struct pruss_suart_initparams *,
+			const u8 *pru_suart_emu_code, u32 fw_size,
+			u32 clk_rate_pruss,
+			struct pruss_suart_iomap *pruss_ioaddr);
+
+extern s32 pru_softuart_open(struct suart_handle *h_suart);
+
+extern s32 pru_softuart_close(struct suart_handle *h_uart);
+
+extern s32 pru_softuart_setbaud(struct device *dev,
+			struct suart_handle *h_uart,
+			u16 tx_clk_divisor, u16 rx_clk_divisor);
+
+extern s32 pru_softuart_setdatabits(struct device *dev,
+			struct suart_handle *h_uart,
+			u16 tx_data_bits, u16 rx_data_bits);
+
+extern s32 pru_softuart_setconfig(struct device *dev,
+			struct suart_handle *h_uart,
+			struct suart_config *config_uart);
+
+extern s32 pru_softuart_getconfig(struct device *dev,
+			struct suart_handle *h_uart,
+			struct suart_config *config_uart);
+
+extern s32 pru_softuart_pending_tx_request(struct device *dev);
+
+extern s32 pru_softuart_write(struct device *dev,
+			struct suart_handle *h_uart,
+			u32 *pt_tx_data_buf, u16 data_len);
+
+extern s32 pru_softuart_read(struct device *dev,
+			struct suart_handle *h_uart,
+			u32 *pt_data_buf, u16 data_len);
+
+extern s32 suart_intr_clrmask(struct device *dev, u16 uart_num,
+						u32 txrxmode,
+						u32 intrmask);
+
+extern s32 pru_softuart_clr_tx_status(struct device *dev,
+				struct suart_handle *h_uart);
+
+extern s32 pru_softuart_get_tx_status(struct device *dev,
+				struct suart_handle *h_uart);
+
+extern s32 pru_softuart_clr_rx_status(struct device *dev,
+				struct suart_handle *h_uart);
+
+extern s32 pru_softuart_get_rx_status(struct device *dev,
+				struct suart_handle *h_uart);
+
+extern s32 pru_softuart_get_isrstatus(struct device *dev, u16 uart_num,
+			u16 *txrx_flag);
+
+extern s32 pru_intr_clr_isrstatus(struct device *dev, u16 uart_num,
+							u32 txrxmode);
+
+extern s32 suart_intr_getmask(struct device *dev, u16 uart_num,
+						u32 txrxmode,
+						u32 intrmask);
+
+extern s32 suart_intr_setmask(struct device *dev, u16 uart_num,
+			u32 txrxmode, u32 intrmask);
+
+extern s32 pru_softuart_get_tx_data_len(struct device *dev,
+				struct suart_handle *h_uart);
+
+extern s32 pru_softuart_get_rx_data_len(struct device *dev,
+				struct suart_handle *h_uart);
+
+extern s32 suart_arm_to_pru_intr(struct device *dev, u16 uart_num);
+
+extern void pru_mcasp_deinit(void);
+
+extern s32 pru_softuart_read_data(struct device *dev,
+			struct suart_handle *h_uart,
+			u8 *p_data_buffer, s32 max_len,
+			u32 *pdata_read);
+
+extern s32 pru_softuart_stop_receive(struct device *dev,
+				struct suart_handle *h_uart);
+
+extern s32 suart_pru_to_host_intr_enable(struct device *dev,
+					u16 uart_num,
+					u32 txrxmode, s32 flag);
+
+extern void pru_set_fifo_timeout(struct device *dev, s16 timeout);
+
+extern void suart_mcasp_config(u32 tx_baud_value,
+			u32 rx_baud_value, u32 oversampling,
+			struct pruss_suart_iomap *pruss_ioaddr);
+
+extern void suart_mcasp_reset(struct pruss_suart_iomap *pruss_ioaddr);
+
+extern short suart_asp_baud_set(u32 tx_baud_value,
+			u32 rx_baud_value, u32 oversampling,
+			struct pruss_suart_iomap *pruss_ioaddr);
+
+extern short suart_asp_serializer_deactivate(u16 sr_num,
+			struct pruss_suart_iomap *pruss_ioaddr);
+
+extern void suart_mcasp_tx_serialzier_set(u32 serializer_num,
+			struct pruss_suart_iomap *pruss_ioaddr);
+#endif
diff --git a/drivers/tty/serial/pruss_suart_api.c b/drivers/tty/serial/pruss_suart_api.c
new file mode 100644
index 0000000..15178f5
--- /dev/null
+++ b/drivers/tty/serial/pruss_suart_api.c
@@ -0,0 +1,1710 @@
+/*
+ * Copyright (C) 2010, 2011 Texas Instruments Incorporated
+ * Author: Jitendra Kumar <jitendra@mistralsolutions.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as  published by the
+ * Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
+ * whether express or implied; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+
+#include <linux/types.h>
+#include <linux/mfd/pruss.h>
+#include "pruss_suart.h"
+
+static u8 uart_statu_table[8];
+static struct pruss_suart_iomap suart_iomap;
+
+static u32 uart_rx[8] = {PRU_SUART0_CONFIG_RX_SER, PRU_SUART1_CONFIG_RX_SER,
+			PRU_SUART2_CONFIG_RX_SER, PRU_SUART3_CONFIG_RX_SER,
+			PRU_SUART4_CONFIG_RX_SER, PRU_SUART5_CONFIG_RX_SER,
+			PRU_SUART6_CONFIG_RX_SER, PRU_SUART7_CONFIG_RX_SER};
+
+static u32 uart_tx[8] = {PRU_SUART0_CONFIG_TX_SER, PRU_SUART1_CONFIG_TX_SER,
+			PRU_SUART2_CONFIG_TX_SER, PRU_SUART3_CONFIG_TX_SER,
+			PRU_SUART4_CONFIG_TX_SER, PRU_SUART5_CONFIG_TX_SER,
+			PRU_SUART6_CONFIG_TX_SER, PRU_SUART7_CONFIG_TX_SER};
+
+static u32 uart_config[8] = {PRU_SUART0_CONFIG_DUPLEX, PRU_SUART1_CONFIG_DUPLEX,
+			PRU_SUART2_CONFIG_DUPLEX, PRU_SUART3_CONFIG_DUPLEX,
+			PRU_SUART4_CONFIG_DUPLEX, PRU_SUART5_CONFIG_DUPLEX,
+			PRU_SUART6_CONFIG_DUPLEX, PRU_SUART7_CONFIG_DUPLEX};
+
+static  s32 pru_softuart_clr_rx_fifo(struct device *dev,
+				struct suart_handle *h_uart);
+static s32 arm_to_pru_intr_init(struct device *dev);
+
+#if (PRU_ACTIVE == BOTH_PRU)
+static void pru_set_ram_data(struct device *dev,
+			struct pruss_suart_iomap *pruss_ioaddr)
+{
+	u32 datatowrite;
+	u32 i;
+	struct pru_suart_regs_ovly *pru_suart_regs = NULL;
+	u32 __iomem *p_sr_ctl_addr = (u32 __iomem *)(pruss_ioaddr->
+						mcasp_io_addr + 0x180);
+	struct pru_suart_tx_cntx_priv *pru_suart_tx_priv = NULL;
+	struct pru_suart_rx_cntx_priv *pru_suart_rx_priv = NULL;
+
+	/* RX PRU - 0 Chanel 0-7 context information */
+	for (i = 0; i < 8; i++, pru_suart_regs++) {
+		pruss_rmwl(dev, (u32) &pru_suart_regs->ch_ctrl_config1,
+						0x3, SUART_CHN_RX);
+		pruss_rmwl(dev, (u32) &pru_suart_regs->ch_ctrl_config1,
+				(0xF << SERIALIZER_OFFSET),
+				((0xF & uart_rx[i]) << SERIALIZER_OFFSET));
+		pruss_rmwl(dev, (u32) &pru_suart_regs->ch_ctrl_config1,
+				(0x3 << SUART_DEFAULT_OVRSMPL_OFFSET),
+				(SUART_DEFAULT_OVRSMPL <<
+				SUART_DEFAULT_OVRSMPL_OFFSET));
+		pruss_rmwl(dev, (u32) &pru_suart_regs->ch_config2_txrx_status,
+								0xF, 8);
+		if ((uart_config[i] & PRU_SUART_HALF_RX_DISABLED) ==
+					PRU_SUART_HALF_RX_DISABLED) {
+			pruss_rmwl(dev,
+				(u32) &pru_suart_regs->ch_config2_txrx_status,
+				(0x1 << SUART_CHN_OFFSET),
+				(SUART_CHN_DISABLED << SUART_CHN_OFFSET));
+		} else {
+			pruss_rmwl(dev,
+				(u32) &pru_suart_regs->ch_config2_txrx_status,
+				(0x1 << SUART_CHN_OFFSET),
+				(SUART_CHN_ENABLED << SUART_CHN_OFFSET));
+			iowrite32(MCASP_SRCTL_RX_MODE, p_sr_ctl_addr +
+								uart_rx[i]);
+		}
+		/*
+		 * RX is active by default, write the dummy received data at
+		 * PRU RAM addr 0x1FC to avoid memory corruption.
+		 */
+		pruss_rmwl(dev, (u32) &pru_suart_regs->ch_txrx_data,
+				0xFFFF, RX_DEFAULT_DATA_DUMP_ADDR);
+		pruss_rmwl(dev, (u32) &pru_suart_regs->reserved1, 0xFFFF, 0);
+		/* SUART1 RX context base addr */
+		pru_suart_rx_priv = (struct pru_suart_rx_cntx_priv *)
+				(PRU0_DATARAM_OFFSET + (0x090 + (i * 0x020)));
+		datatowrite = (MCASP_RBUF_BASE_ADDR + (uart_rx[i] << 2));
+		pruss_writel(dev, (u32) &pru_suart_rx_priv->asp_rbuf_base,
+							datatowrite);
+		datatowrite = (MCASP_SRCTL_BASE_ADDR + (uart_rx[i] << 2));
+		pruss_writel(dev, (u32) &pru_suart_rx_priv->asp_rsrctl_base,
+							datatowrite);
+	}
+
+	/* PRU1 RAM BASE ADDR */
+	pru_suart_regs = (struct pru_suart_regs_ovly *) PRU1_DATARAM_OFFSET;
+
+	/* TX PRU - 1 */
+	/* Channel 0-7 context information */
+	for (i = 0; i < 8; i++, pru_suart_regs++) {
+		pruss_rmwl(dev, (u32) &pru_suart_regs->ch_ctrl_config1,
+						0x3, SUART_CHN_TX);
+		pruss_rmwl(dev, (u32) &pru_suart_regs->ch_ctrl_config1,
+				(0xF << SERIALIZER_OFFSET),
+				((0xF & uart_tx[i]) << SERIALIZER_OFFSET));
+		pruss_rmwl(dev, (u32) &pru_suart_regs->ch_ctrl_config1,
+				(0x3 << SUART_DEFAULT_OVRSMPL_OFFSET),
+				(SUART_DEFAULT_OVRSMPL <<
+				SUART_DEFAULT_OVRSMPL_OFFSET));
+		pruss_rmwl(dev,
+			(u32) &pru_suart_regs->ch_config2_txrx_status, 0xF, 8);
+
+		if ((uart_config[i] & PRU_SUART_HALF_TX_DISABLED) ==
+						PRU_SUART_HALF_TX_DISABLED) {
+			pruss_rmwl(dev, (u32)
+				&pru_suart_regs->ch_config2_txrx_status,
+				(0x1 << SUART_CHN_OFFSET),
+				(SUART_CHN_DISABLED << SUART_CHN_OFFSET));
+		} else {
+			pruss_rmwl(dev,
+				(u32) &pru_suart_regs->ch_config2_txrx_status,
+				(0x1 << SUART_CHN_OFFSET),
+				(SUART_CHN_ENABLED << SUART_CHN_OFFSET));
+			iowrite32(MCASP_SRCTL_TX_MODE,
+				p_sr_ctl_addr + uart_tx[i]);
+		}
+		pruss_rmwl(dev, (u32) &pru_suart_regs->reserved1, 0xFFFF, 1);
+
+		/* SUART1 TX context base addr */
+		pru_suart_tx_priv = (struct pru_suart_tx_cntx_priv *)
+			(PRU1_DATARAM_OFFSET + (0x0B0 + (i * 0x02C)));
+		datatowrite = (MCASP_SRCTL_BASE_ADDR + (uart_tx[i] << 2));
+		pruss_writel(dev, (u32) &pru_suart_tx_priv->asp_xsrctl_base,
+							datatowrite);
+		datatowrite = (MCASP_XBUF_BASE_ADDR + (uart_tx[i] << 2));
+		pruss_writel(dev, (u32) &pru_suart_tx_priv->asp_xbuf_base,
+							datatowrite);
+		/* SUART1 TX formatted data base addr */
+		datatowrite = (0x0090 + (i * 0x002C));
+		pruss_writel(dev, (u32) &pru_suart_tx_priv->buff_addr,
+							datatowrite);
+	}
+}
+#else
+static void pru_set_ram_data(struct device *dev,
+			struct pruss_suart_iomap *pruss_ioaddr)
+{
+
+	struct pru_suart_regs_ovly *pru_suart_regs =
+		(struct pru_suart_regs_ovly *)pruss_ioaddr->pru_io_addr;
+	u32 i;
+	u32 *p_sr_ctl_addr = (u32 *)(pruss_ioaddr->mcasp_io_addr + 0x180);
+	struct pru_suart_tx_cntx_priv *pru_suart_tx_priv = NULL;
+	struct pru_suart_rx_cntx_priv *pru_suart_rx_priv = NULL;
+
+	/* Channel 0 context information is Tx */
+	for (i = 0; i < 4; i++, pru_suart_regs++) {
+		pruss_rmwl(dev, (u32) &pru_suart_regs->ch_ctrl_config1,
+						0x3, SUART_CHN_TX);
+		pruss_rmwl(dev, (u32) &pru_suart_regs->ch_ctrl_config1,
+						(0xF << SERIALIZER_OFFSET),
+				((0xF & uart_tx[i]) << SERIALIZER_OFFSET));
+		pruss_rmwl(dev, (u32) &pru_suart_regs->ch_ctrl_config1,
+				(0x3 << SUART_DEFAULT_OVRSMPL_OFFSET),
+				(SUART_DEFAULT_OVRSMPL <<
+				SUART_DEFAULT_OVRSMPL_OFFSET));
+		pruss_rmwl(dev, (u32) &pru_suart_regs->ch_config2_txrx_status,
+								0xF, 8);
+		if ((uart_config[i] & PRU_SUART_HALF_TX_DISABLED) ==
+						PRU_SUART_HALF_TX_DISABLED){
+			pruss_rmwl(dev, (u32)
+				&pru_suart_regs->ch_config2_txrx_status,
+				(0x1 << SUART_CHN_OFFSET),
+				(SUART_CHN_DISABLED << SUART_CHN_OFFSET));
+		} else {
+			pruss_rmwl(dev,
+				(u32) &pru_suart_regs->ch_config2_txrx_status,
+				(0x1 << SUART_CHN_OFFSET),
+				(SUART_CHN_ENABLED << SUART_CHN_OFFSET));
+			iowrite32(MCASP_SRCTL_TX_MODE,
+						p_sr_ctl_addr + uart_tx[i]);
+		}
+		pruss_rmwl(dev, (u32) &pru_suart_regs->reserved1, 0xFFFF, 1);
+
+		/* SUART1 TX context base addr */
+		pru_suart_tx_priv = (struct pru_suart_tx_cntx_priv *)
+				(PRU0_DATARAM_OFFSET + (0x0B0 + (i * 0x50)));
+		pruss_writel(dev, (u32) &pru_suart_tx_priv->asp_xsrctl_base,
+				(MCASP_SRCTL_BASE_ADDR + (uart_tx[i] << 2)));
+		pruss_writel(dev, (u32) &pru_suart_tx_priv->asp_xbuf_base,
+				(MCASP_XBUF_BASE_ADDR + (uart_tx[i] << 2)));
+		/* SUART1 TX formatted data base addr */
+		pruss_writel(dev, (u32) &pru_suart_tx_priv->buff_addr,
+					(0x0090 + (i * 0x050)));
+
+		/* Channel 1 is Rx context information */
+		pru_suart_regs++;
+		pruss_rmwl(dev, (u32) &pru_suart_regs->ch_ctrl_config1,
+							0x3, SUART_CHN_RX);
+		pruss_rmwl(dev, (u32) &pru_suart_regs->ch_ctrl_config1,
+						(0xF << SERIALIZER_OFFSET),
+				((0xF & uart_rx[i]) << SERIALIZER_OFFSET));
+		pruss_rmwl(dev, (u32) &pru_suart_regs->ch_ctrl_config1,
+				(0x3 << SUART_DEFAULT_OVRSMPL_OFFSET),
+				(SUART_DEFAULT_OVRSMPL <<
+				SUART_DEFAULT_OVRSMPL_OFFSET));
+		pruss_rmwl(dev,
+			(u32) &pru_suart_regs->ch_config2_txrx_status, 0xF, 8);
+
+		if ((uart_config[i] & PRU_SUART_HALF_RX_DISABLED) ==
+						PRU_SUART_HALF_RX_DISABLED) {
+			pruss_rmwl(dev,
+				(u32) &pru_suart_regs->ch_config2_txrx_status,
+				(0x1 << SUART_CHN_OFFSET),
+				(SUART_CHN_DISABLED << SUART_CHN_OFFSET));
+		} else {
+			pruss_rmwl(dev,
+				(u32) &pru_suart_regs->ch_config2_txrx_status,
+				(0x1 << SUART_CHN_OFFSET),
+				(SUART_CHN_ENABLED << SUART_CHN_OFFSET));
+			iowrite32(MCASP_SRCTL_RX_MODE,
+					p_sr_ctl_addr + uart_rx[i]);
+		}
+		/*
+		 * RX is active by default, write the dummy received data
+		 * at PRU RAM addr 0x1FC to avoid memory corruption
+		 */
+		pruss_rmwl(dev, (u32) &pru_suart_regs->ch_txrx_data,
+				0xFFFF, RX_DEFAULT_DATA_DUMP_ADDR);
+		pruss_rmwl(dev, (u32) &pru_suart_regs->reserved1, 0xFFFF, 0);
+		/* SUART1 RX context base addr */
+		pru_suart_rx_priv = (struct pru_suart_rx_cntx_priv *)
+			(PRU0_DATARAM_OFFSET + (0x0C0 + (i * 0x50)));
+		pruss_writel(dev, (u32) &pru_suart_rx_priv->asp_rbuf_base,
+				(MCASP_RBUF_BASE_ADDR + (uart_rx[i] << 2)));
+		pruss_writel(dev, (u32) &pru_suart_rx_priv->asp_rsrctl_base,
+				(MCASP_SRCTL_BASE_ADDR + (uart_rx[i] << 2)));
+	}
+}
+#endif
+
+static void pru_set_rx_tx_mode(struct device *dev, u32 pru_mode, u32 pru_num)
+{
+	u32 pru_offset;
+
+	if (pru_num == PRUSS_NUM0)
+		pru_offset = PRU_SUART_PRU0_RX_TX_MODE;
+	else if (pru_num == PRUSS_NUM1)
+		pru_offset = PRU_SUART_PRU1_RX_TX_MODE;
+	else
+		return;
+	pruss_writeb(dev, pru_offset, (u8) pru_mode);
+}
+
+static void pru_set_delay_count(struct device *dev, u32 pru_freq)
+{
+	u32 delay_cnt;
+
+	if (pru_freq == PRU_CLK_228)
+		delay_cnt = 5;
+	else if (pru_freq == PRU_CLK_186)
+		delay_cnt = 5;
+	else
+		delay_cnt = 3;
+
+	/* PRU 0 */
+	pruss_writeb(dev, PRU_SUART_PRU0_DELAY_OFFSET,
+		(u8) delay_cnt);
+
+	/* PRU 1 */
+	pruss_writeb(dev, PRU_SUART_PRU1_DELAY_OFFSET,
+		(u8) delay_cnt);
+}
+
+static s32 suart_set_pru_id(struct device *dev, u32 pru_no)
+{
+	u32 offset;
+	u8 reg_val = 0;
+
+	if (PRUSS_NUM0 == pru_no)
+		offset = PRU_SUART_PRU0_ID_ADDR;
+	else if (PRUSS_NUM1 == pru_no)
+		offset = PRU_SUART_PRU1_ID_ADDR;
+	else
+		return -EINVAL;
+
+	reg_val = pru_no;
+	pruss_writeb(dev, offset, reg_val);
+
+	return 0;
+}
+
+/*
+ * suart Initialization routine
+ */
+s32 pru_softuart_init(struct device *dev,
+			struct pruss_suart_initparams *init_params,
+			const u8 *pru_suart_emu_code, u32 fw_size,
+			u32 clk_rate_pruss,
+			struct pruss_suart_iomap *pruss_ioaddr)
+{
+	u32 datatowrite[128] = {0};
+	s16 status = 0;
+	s16 idx;
+	s16 retval;
+	u16 i;
+
+	if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH) &&
+				(PRU1_MODE == PRU_MODE_RX_TX_BOTH))
+		return -EINVAL;
+
+	suart_iomap.mcasp_io_addr = pruss_ioaddr->mcasp_io_addr;
+	suart_iomap.p_fifo_buff_phys_base =
+			pruss_ioaddr->p_fifo_buff_phys_base;
+	suart_iomap.p_fifo_buff_virt_base =
+			pruss_ioaddr->p_fifo_buff_virt_base;
+	/* Configure McASP0  */
+	suart_mcasp_config(init_params->tx_baud_value,
+				init_params->rx_baud_value,
+				init_params->oversampling, pruss_ioaddr);
+	pruss_enable(dev, PRUSS_NUM0);
+
+	if (PRU1_MODE != PRU_MODE_INVALID)
+		pruss_enable(dev, PRUSS_NUM1);
+
+	/* Reset PRU RAM */
+	for (i = 0; i < (PRU0_DATARAM_SIZE / sizeof(int)); i++)
+		pruss_writel(dev, (PRU0_DATARAM_OFFSET + (i * sizeof(int))),
+							datatowrite[i]);
+	if (PRU1_MODE != PRU_MODE_INVALID) {
+		for (i = 0; i < (PRU1_DATARAM_SIZE / sizeof(int)); i++)
+			pruss_writel(dev, (PRU1_DATARAM_OFFSET +
+					(i * sizeof(int))), datatowrite[i]);
+	}
+
+	pruss_load(dev, PRUSS_NUM0, (u32 *)pru_suart_emu_code,
+					(fw_size / sizeof(u32)));
+	if (PRU1_MODE != PRU_MODE_INVALID)
+		pruss_load(dev, PRUSS_NUM1, (u32 *)pru_suart_emu_code,
+					(fw_size / sizeof(u32)));
+
+	retval = arm_to_pru_intr_init(dev);
+	if (-1 == retval)
+		return status;
+	pru_set_delay_count(dev, clk_rate_pruss);
+	suart_set_pru_id(dev, PRUSS_NUM0);
+	if (PRU1_MODE != PRU_MODE_INVALID)
+		suart_set_pru_id(dev, PRUSS_NUM1);
+
+	pru_set_rx_tx_mode(dev, PRU0_MODE, PRUSS_NUM0);
+	if (PRU1_MODE != PRU_MODE_INVALID)
+		pru_set_rx_tx_mode(dev, PRU1_MODE, PRUSS_NUM1);
+
+	pru_set_ram_data(dev, pruss_ioaddr);
+	pruss_run(dev, PRUSS_NUM0);
+
+	if (PRU1_MODE != PRU_MODE_INVALID)
+		pruss_run(dev, PRUSS_NUM1);
+
+	/* Initialize uart_statu_table */
+	for (idx = 0; idx < 8; idx++)
+		uart_statu_table[idx] = ePRU_SUART_UART_FREE;
+
+	return status;
+}
+
+void pru_set_fifo_timeout(struct device *dev, s16 timeout)
+{
+	pruss_writew(dev, PRU_SUART_PRU0_IDLE_TIMEOUT_OFFSET, (u16) timeout);
+	if (PRU1_MODE != PRU_MODE_INVALID)
+		pruss_writew(dev, PRU_SUART_PRU1_IDLE_TIMEOUT_OFFSET,
+						(u16) timeout);
+}
+
+void pru_mcasp_deinit(void)
+{
+	suart_mcasp_reset(&suart_iomap);
+}
+
+/* suart Instance open routine  */
+s32 pru_softuart_open(struct suart_handle *h_suart)
+{
+	s16 status = 0;
+	u16 uart_num = h_suart->uart_num - 1;
+
+	if (uart_statu_table[h_suart->uart_num - 1] ==
+			ePRU_SUART_UART_IN_USE) {
+		return -EUSERS;
+	} else {
+		h_suart->uart_type = uart_config[uart_num];
+		h_suart->uart_tx_channel = uart_tx[uart_num];
+		h_suart->uart_rx_channel = uart_rx[uart_num];
+		h_suart->uart_status = ePRU_SUART_UART_IN_USE;
+		uart_statu_table[h_suart->uart_num - 1] =
+						ePRU_SUART_UART_IN_USE;
+	}
+	return status;
+}
+
+/* suart instance close routine */
+s32 pru_softuart_close(struct suart_handle *h_uart)
+{
+	s16 status = 0;
+
+	if (h_uart == NULL) {
+		WARN_ON(1);
+		return -EINVAL;
+	} else {
+		uart_statu_table[h_uart->uart_num - 1] =
+			ePRU_SUART_UART_FREE;
+		/* Reset the Instance to Invalid */
+		h_uart->uart_num = PRU_SUART_UARTx_INVALID;
+		h_uart->uart_status = ePRU_SUART_UART_FREE;
+	}
+	return status;
+}
+
+static s32 search_chnum(u16 uart_num, u16 *ch_num, u32 *pru_offset, u16 mode)
+{
+	if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH)
+		|| (PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
+		*ch_num = (uart_num * SUART_NUM_OF_CHANNELS_PER_SUART) - 2;
+		if (uart_num <= 4) {
+			*pru_offset = PRU_SUART_PRU0_CH0_OFFSET;
+		} else {
+			*pru_offset = PRU_SUART_PRU1_CH0_OFFSET;
+			*ch_num -= 8;
+		}
+		(mode == 2) ? ++*ch_num : *ch_num;
+	} else if (mode == 1) {
+			if (PRU0_MODE == PRU_MODE_TX_ONLY)
+				*pru_offset = PRU_SUART_PRU0_CH0_OFFSET;
+			else if (PRU1_MODE == PRU_MODE_TX_ONLY)
+				*pru_offset = PRU_SUART_PRU1_CH0_OFFSET;
+	} else if (mode == 2) {
+			if (PRU0_MODE == PRU_MODE_RX_ONLY)
+				*pru_offset = PRU_SUART_PRU0_CH0_OFFSET;
+			else if (PRU1_MODE == PRU_MODE_RX_ONLY)
+				*pru_offset = PRU_SUART_PRU1_CH0_OFFSET;
+	}
+	return 0;
+}
+
+/*
+ * suart routine for setting relative baud rate
+ */
+s32 pru_softuart_setbaud(struct device *dev, struct suart_handle *h_uart,
+		u16 tx_clk_divisor, u16 rx_clk_divisor)
+{
+	u32 offset;
+	u32 pru_offset;
+	s16 status = 0;
+	u16 ch_num = h_uart->uart_num - 1;
+	u16 regval = 0;
+
+	if (h_uart == NULL) {
+		WARN_ON(1);
+		return -EINVAL;
+	}
+
+	/* Set the clock divisor value s32o the McASP */
+	if ((tx_clk_divisor > 385) || (tx_clk_divisor == 0))
+		return -EINVAL;
+	if ((rx_clk_divisor > 385) || (rx_clk_divisor == 0))
+		return -EINVAL;
+	search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 1);
+
+	if (tx_clk_divisor != 0) {
+		offset = pru_offset +
+			(ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+			PRU_SUART_CH_CONFIG1_OFFSET;
+		pruss_readw(dev, offset, (u16 *) &regval);
+		regval &= (~0x3FF);
+		regval |= tx_clk_divisor;
+		pruss_writew(dev, offset, regval);
+	}
+	if (PRU0_MODE == PRU_MODE_RX_ONLY) {
+		pru_offset = PRU_SUART_PRU0_CH0_OFFSET;
+	} else if (PRU1_MODE == PRU_MODE_RX_ONLY) {
+		pru_offset = PRU_SUART_PRU1_CH0_OFFSET;
+	} else if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH) ||
+			(PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
+		ch_num++;
+	} else {
+		return 0;
+	}
+	regval = 0;
+	if (rx_clk_divisor != 0) {
+		offset = pru_offset +
+			(ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+			PRU_SUART_CH_CONFIG1_OFFSET;
+		pruss_readw(dev, offset, (u16 *) &regval);
+		regval &= (~0x3FF);
+		regval |= tx_clk_divisor;
+		pruss_writew(dev, offset, regval);
+	}
+	return status;
+}
+
+/*
+ * suart routine for setting number of bits per character for a specific uart
+ */
+s32 pru_softuart_setdatabits(struct device *dev, struct suart_handle *h_uart,
+		u16 tx_data_bits, u16 rx_data_bits)
+{
+	u32 offset;
+	u32 pru_offset;
+	s16 status = 0;
+	u16 ch_num = h_uart->uart_num - 1;
+	u32 reg_val;
+
+	if (h_uart == NULL) {
+		WARN_ON(1);
+		return -EINVAL;
+	}
+
+	/*
+	 * NOTE:
+	 * The supported data bits are 6,7,8,9,10,11,12 bits per character
+	 */
+
+	if ((tx_data_bits < ePRU_SUART_DATA_BITS6)
+			|| (tx_data_bits > ePRU_SUART_DATA_BITS12))
+		return -EINVAL;
+
+	if ((rx_data_bits < ePRU_SUART_DATA_BITS6)
+			|| (rx_data_bits > ePRU_SUART_DATA_BITS12))
+		return -EINVAL;
+	search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 1);
+
+	if (tx_data_bits != 0) {
+		offset = pru_offset +
+			(ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+			PRU_SUART_CH_CONFIG2_OFFSET;
+		pruss_readb(dev, offset, (u8 *) &reg_val);
+		reg_val &= ~(0xF);
+		reg_val |= tx_data_bits;
+		pruss_writeb(dev, offset, (u8) reg_val);
+	}
+	if (PRU0_MODE == PRU_MODE_RX_ONLY) {
+		pru_offset = PRU_SUART_PRU0_CH0_OFFSET;
+	} else if (PRU1_MODE == PRU_MODE_RX_ONLY) {
+		pru_offset = PRU_SUART_PRU1_CH0_OFFSET;
+	} else if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH)
+			|| (PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
+		ch_num++;
+	} else {
+		return 0;
+	}
+	if (rx_data_bits != 0) {
+		offset = pru_offset +
+			(ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+			PRU_SUART_CH_CONFIG2_OFFSET;
+		pruss_readb(dev, offset, (u8 *) &reg_val);
+		reg_val &= ~(0xF);
+		reg_val |= rx_data_bits;
+		pruss_writeb(dev, offset, (u8) rx_data_bits);
+	}
+
+	return status;
+}
+
+/*
+ * suart routine to configure specific uart
+ */
+s32 pru_softuart_setconfig(struct device *dev, struct suart_handle *h_uart,
+				struct suart_config *config_uart)
+{
+	u32 offset;
+	u32 pru_offset;
+	s16 status = 0;
+	u16 ch_num = h_uart->uart_num - 1;
+	u16 reg_val = 0;
+
+	if (h_uart == NULL) {
+		WARN_ON(1);
+		return -EINVAL;
+	}
+
+	/*
+	 * NOTE:
+	 * Dependent baud rate for the given UART,the value MUST BE LESS THAN OR
+	 * EQUAL TO 64, preScalarValue <= 64
+	 */
+	if ((config_uart->tx_clk_divisor > 384)
+			|| (config_uart->rx_clk_divisor > 384)) {
+		return -EINVAL;
+	}
+	if ((config_uart->tx_bits_per_char < 8)
+			|| (config_uart->tx_bits_per_char > 14)) {
+		return -EINVAL;
+	}
+	if ((config_uart->rx_bits_per_char < 8)
+			|| (config_uart->rx_bits_per_char > 14)) {
+		return -EINVAL;
+	}
+	search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 1);
+
+	/*
+	 * Configuring the Transmit part of the given UART
+	 * Serializer has been as TX in mcasp config, by writing 1 in bits
+	 * corresponding to tx serializer in PFUNC regsiter ie already set
+	 * to GPIO mode PRU code will set then back to MCASP mode once TX
+	 * request for that serializer is posted.It is required because at this
+	 * pos32 Mcasp is accessed by both PRU and DSP have lower priority for
+	 * Mcasp in comparison to PRU and DPS keeps on looping there only
+	 *
+	 * suart_mcasp_tx_serialzier_set
+	 * (config_uart->tx_serializer, &suart_iomap);
+	 */
+
+	/* Configuring TX serializer  */
+	if (config_uart->tx_serializer != PRU_SUART_SERIALIZER_NONE) {
+		offset = pru_offset +
+			(ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+			PRU_SUART_CH_CTRL_OFFSET;
+		pruss_readw(dev, offset, (u16 *) &reg_val);
+		reg_val = reg_val | (config_uart->tx_serializer <<
+			PRU_SUART_CH_CTRL_SR_SHIFT);
+		pruss_writew(dev, offset, reg_val);
+		offset = pru_offset +
+			(ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+			PRU_SUART_CH_CONFIG1_OFFSET;
+		pruss_readw(dev, offset, (u16 *) &reg_val);
+		reg_val = reg_val | (config_uart->tx_clk_divisor <<
+			PRU_SUART_CH_CONFIG1_DIVISOR_SHIFT);
+		pruss_writew(dev, offset, reg_val);
+		offset = pru_offset +
+			(ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+			PRU_SUART_CH_CONFIG2_OFFSET;
+		pruss_readw(dev, offset, (u16 *) &reg_val);
+		reg_val = reg_val | (config_uart->tx_bits_per_char <<
+			PRU_SUART_CH_CONFIG2_BITPERCHAR_SHIFT);
+		pruss_writew(dev, offset, reg_val);
+	}
+
+	if (PRU0_MODE == PRU_MODE_RX_ONLY) {
+		pru_offset = PRU_SUART_PRU0_CH0_OFFSET;
+	} else if (PRU1_MODE == PRU_MODE_RX_ONLY) {
+		pru_offset = PRU_SUART_PRU1_CH0_OFFSET;
+	} else if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH) ||
+			(PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
+		ch_num++;
+	} else {
+		return 0;
+	}
+
+	/* Configuring the Transmit part of the given UART */
+	if (config_uart->rx_serializer != PRU_SUART_SERIALIZER_NONE) {
+		/* Configuring RX serializer  */
+		offset = pru_offset +
+			(ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+			PRU_SUART_CH_CTRL_OFFSET;
+		pruss_readw(dev, offset, (u16 *) &reg_val);
+		reg_val = reg_val | (config_uart->rx_serializer <<
+			PRU_SUART_CH_CTRL_SR_SHIFT);
+		pruss_writew(dev, offset, reg_val);
+
+		/* Configuring RX prescalar value and Oversampling */
+		offset = pru_offset +
+			(ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+			PRU_SUART_CH_CONFIG1_OFFSET;
+		pruss_readw(dev, offset, (u16 *) &reg_val);
+		reg_val = reg_val | (config_uart->rx_clk_divisor <<
+			PRU_SUART_CH_CONFIG1_DIVISOR_SHIFT) |
+			(config_uart->oversampling <<
+			PRU_SUART_CH_CONFIG1_OVS_SHIFT);
+		pruss_writew(dev, offset, reg_val);
+
+		/* Configuring RX bits per character value */
+		offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL)
+						+ PRU_SUART_CH_CONFIG2_OFFSET;
+		pruss_readw(dev, offset, (u16 *) &reg_val);
+		reg_val = reg_val | (config_uart->rx_bits_per_char <<
+			PRU_SUART_CH_CONFIG1_DIVISOR_SHIFT);
+		pruss_writew(dev, offset, reg_val);
+	}
+	return status;
+}
+
+/*
+ * suart routine for getting the number of bytes transfered
+ */
+s32 pru_softuart_get_tx_data_len(struct device *dev,
+					struct suart_handle *h_uart)
+{
+	u32 offset;
+	u32 pru_offset;
+	u16 ch_num = h_uart->uart_num - 1;
+	u16 read_value = 0;
+
+	if (h_uart == NULL) {
+		WARN_ON(1);
+		return -EINVAL;
+	}
+
+	search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 1);
+
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+						PRU_SUART_CH_CONFIG2_OFFSET;
+	pruss_readw(dev, offset, (u16 *) &read_value);
+	read_value = ((read_value & PRU_SUART_CH_CONFIG1_DIVISOR_MASK)
+					>> PRU_SUART_CH_CONFIG2_DATALEN_SHIFT);
+	return read_value;
+}
+
+/*
+ * suart routine for getting the number of bytes received
+ */
+s32 pru_softuart_get_rx_data_len(struct device *dev,
+					struct suart_handle *h_uart)
+{
+	u32 offset;
+	u32 pru_offset;
+	u16 ch_num = h_uart->uart_num - 1;
+	u16 read_value = 0;
+
+	if (h_uart == NULL) {
+		WARN_ON(1);
+		return -EINVAL;
+	}
+
+	search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 2);
+
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+						PRU_SUART_CH_CONFIG2_OFFSET;
+	pruss_readw(dev, offset, (u16 *) &read_value);
+	read_value = ((read_value & PRU_SUART_CH_CONFIG1_DIVISOR_MASK)
+					>> PRU_SUART_CH_CONFIG2_DATALEN_SHIFT);
+	return read_value;
+}
+
+/*
+ * suart routine to get the configuration information from a specific uart
+ */
+s32 pru_softuart_getconfig(struct device *dev,
+			 struct suart_handle *h_uart,
+			struct suart_config *config_uart)
+{
+	u32 offset;
+	u32 pru_offset;
+	u16 ch_num = h_uart->uart_num - 1;
+	u16 reg_val = 0;
+	s16 status = 0;
+
+	if (h_uart == NULL) {
+		WARN_ON(1);
+		return -EINVAL;
+	}
+
+	/*
+	 * NOTE:
+	 * Dependent baud rate for the given UART,the value MUST BE LESS THAN OR
+	 * EQUAL TO 64, preScalarValue <= 64
+	 */
+	search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 1);
+
+	/* Configuring the Transmit part of the given UART */
+	/* Configuring TX serializer  */
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+						PRU_SUART_CH_CTRL_OFFSET;
+	pruss_readw(dev, offset, (u16 *) &reg_val);
+	config_uart->tx_serializer = ((reg_val & PRU_SUART_CH_CTRL_SR_MASK) >>
+						PRU_SUART_CH_CTRL_SR_SHIFT);
+	/* Configuring TX prescalar value */
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+						PRU_SUART_CH_CONFIG1_OFFSET;
+	pruss_readw(dev, offset, (u16 *) &reg_val);
+	config_uart->tx_clk_divisor = ((reg_val &
+				 PRU_SUART_CH_CONFIG1_DIVISOR_MASK) >>
+					 PRU_SUART_CH_CONFIG1_DIVISOR_SHIFT);
+
+	/* Configuring TX bits per character value */
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+					PRU_SUART_CH_CONFIG2_OFFSET;
+	pruss_readw(dev, offset, (u16 *) &reg_val);
+	config_uart->tx_bits_per_char = ((reg_val &
+				 PRU_SUART_CH_CONFIG1_DIVISOR_MASK) >>
+					PRU_SUART_CH_CONFIG1_DIVISOR_SHIFT);
+
+	if (PRU0_MODE == PRU_MODE_RX_ONLY) {
+		pru_offset = PRU_SUART_PRU0_CH0_OFFSET;
+	} else if (PRU1_MODE == PRU_MODE_RX_ONLY) {
+		pru_offset = PRU_SUART_PRU1_CH0_OFFSET;
+	} else if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH) ||
+				(PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
+		ch_num++;
+	} else {
+		return 0;
+	}
+	/* Configuring the Transmit part of the given UART */
+	/* Configuring RX serializer  */
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+						PRU_SUART_CH_CTRL_OFFSET;
+	pruss_readw(dev, offset, (u16 *) &reg_val);
+	config_uart->rx_serializer = ((reg_val & PRU_SUART_CH_CTRL_SR_MASK) >>
+						PRU_SUART_CH_CTRL_SR_SHIFT);
+
+	/* Configuring RX prescalar value and oversampling */
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+						PRU_SUART_CH_CONFIG1_OFFSET;
+	pruss_readw(dev, offset, (u16 *) &reg_val);
+	config_uart->rx_clk_divisor = ((reg_val &
+					 PRU_SUART_CH_CONFIG1_DIVISOR_MASK)
+					>> PRU_SUART_CH_CONFIG1_DIVISOR_SHIFT);
+	config_uart->oversampling = ((reg_val &
+					 PRU_SUART_CH_CONFIG1_OVS_MASK) >>
+						PRU_SUART_CH_CONFIG1_OVS_SHIFT);
+
+	/* Configuring RX bits per character value */
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+						PRU_SUART_CH_CONFIG2_OFFSET;
+	pruss_readw(dev, offset, (u16 *) &reg_val);
+	config_uart->rx_bits_per_char = ((reg_val &
+					 PRU_SUART_CH_CONFIG1_DIVISOR_MASK)
+					>> PRU_SUART_CH_CONFIG1_DIVISOR_SHIFT);
+
+	return status;
+}
+
+s32 pru_softuart_pending_tx_request(struct device *dev)
+{
+	u32 offset = 0;
+	u32 ISR_value = 0;
+
+	if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH)
+	    || (PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
+		return 0;
+	} else if (PRU0_MODE == PRU_MODE_TX_ONLY) {
+		/* Read PRU Interrupt Status Register from PRU */
+		offset = (u32) (PRUSS_INTC_STATCLRINT1 & 0xFFFF);
+		pruss_readl(dev, offset, (u32 *)&ISR_value);
+		if ((ISR_value & 0x1) == 0x1)
+			return -EINVAL;
+	} else if (PRU1_MODE == PRU_MODE_TX_ONLY) {
+		/* Read PRU Interrupt Status Register from PRU */
+		offset = (u32) (PRUSS_INTC_STATCLRINT1 & 0xFFFF);
+		pruss_readl(dev, offset, (u32 *)&ISR_value);
+		if ((ISR_value & 0x2) == 0x2)
+			return -EINVAL;
+	} else {
+		return 0;
+	}
+
+	return 0;
+}
+
+/*
+ * suart data transmit routine
+ */
+s32 pru_softuart_write(struct device *dev, struct suart_handle *h_uart,
+		u32 *pt_tx_data_buf, u16 data_len)
+{
+	u32 offset = 0;
+	u32 pru_offset;
+	s16 status = 0;
+	u16 ch_num = h_uart->uart_num - 1;
+	u16 reg_val = 0;
+	u16 pru_num;
+
+	if (h_uart == NULL) {
+		WARN_ON(1);
+		return -EINVAL;
+	}
+	search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 1);
+	if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH) ||
+				(PRU1_MODE == PRU_MODE_RX_TX_BOTH))
+		pru_num = h_uart->uart_num;
+	else if (PRU0_MODE == PRU_MODE_TX_ONLY)
+		pru_num = 0;
+	else if (PRU1_MODE == PRU_MODE_TX_ONLY)
+		pru_num = 1;
+	else
+		return 0;
+
+	/* Writing data length to SUART channel register */
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+				PRU_SUART_CH_CONFIG2_OFFSET;
+	pruss_readw(dev, offset, (u16 *) &reg_val);
+	reg_val &= ~PRU_SUART_CH_CONFIG2_DATALEN_MASK;
+	reg_val = reg_val | (data_len << PRU_SUART_CH_CONFIG2_DATALEN_SHIFT);
+	pruss_writew(dev, offset, reg_val);
+
+	/* Writing the data pos32er to channel TX data pointer */
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+				PRU_SUART_CH_TXRXDATA_OFFSET;
+	pruss_writel(dev, offset, (u32) *pt_tx_data_buf);
+
+	/* Service Request to PRU */
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+				PRU_SUART_CH_CTRL_OFFSET;
+	pruss_readw(dev, offset, (u16 *) &reg_val);
+	reg_val &= ~(PRU_SUART_CH_CTRL_MODE_MASK |
+			PRU_SUART_CH_CTRL_SREQ_MASK);
+	reg_val |= (PRU_SUART_CH_CTRL_TX_MODE <<
+		PRU_SUART_CH_CTRL_MODE_SHIFT) | (PRU_SUART_CH_CTRL_SREQ <<
+		PRU_SUART_CH_CTRL_SREQ_SHIFT);
+	pruss_writew(dev, offset, reg_val);
+
+	/* generate ARM->PRU event */
+	suart_arm_to_pru_intr(dev, pru_num);
+
+	return status;
+}
+
+/*
+ * suart data receive routine
+ */
+s32 pru_softuart_read(struct device *dev, struct suart_handle *h_uart,
+		u32 *ptDataBuf, u16 data_len)
+{
+	u32 offset = 0;
+	u32 pru_offset;
+	s16 status = 0;
+	u16 ch_num = h_uart->uart_num - 1;
+	u16 reg_val = 0;
+	u16 pru_num;
+
+	if (h_uart == NULL) {
+		WARN_ON(1);
+		return -EINVAL;
+	}
+	search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 2);
+	if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH) ||
+			 (PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
+		/* channel starts from 0 and uart instance starts from 1 */
+		ch_num = (h_uart->uart_num *
+			SUART_NUM_OF_CHANNELS_PER_SUART) - 2;
+		pru_num = h_uart->uart_num;
+	} else if (PRU0_MODE == PRU_MODE_RX_ONLY) {
+		pru_num = 0;
+	} else if (PRU1_MODE == PRU_MODE_RX_ONLY) {
+		pru_num = 1;
+	} else {
+		return 0;
+	}
+	/* Writing data length to SUART channel register */
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+					PRU_SUART_CH_CONFIG2_OFFSET;
+	pruss_readw(dev, offset, (u16 *) &reg_val);
+	reg_val &= ~PRU_SUART_CH_CONFIG2_DATALEN_MASK;
+	reg_val = reg_val | (data_len << PRU_SUART_CH_CONFIG2_DATALEN_SHIFT);
+	pruss_writew(dev, offset, reg_val);
+
+	/* Writing the data pos32er to channel RX data pointer */
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+		PRU_SUART_CH_TXRXDATA_OFFSET;
+	pruss_writel(dev, offset, (u32) *ptDataBuf);
+
+	/* Service Request to PRU */
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+		PRU_SUART_CH_CTRL_OFFSET;
+	pruss_readw(dev, offset, (u16 *) &reg_val);
+	reg_val &= ~(PRU_SUART_CH_CTRL_MODE_MASK |
+		PRU_SUART_CH_CTRL_SREQ_MASK);
+	reg_val |= (PRU_SUART_CH_CTRL_RX_MODE <<
+		PRU_SUART_CH_CTRL_MODE_SHIFT) | (PRU_SUART_CH_CTRL_SREQ <<
+		PRU_SUART_CH_CTRL_SREQ_SHIFT);
+	pruss_writew(dev, offset, reg_val);
+
+	/* enable the timeout s32errupt */
+	suart_intr_setmask(dev, h_uart->uart_num, PRU_RX_INTR,
+		CHN_TXRX_IE_MASK_TIMEOUT);
+
+	/* generate ARM->PRU event */
+	suart_arm_to_pru_intr(dev, pru_num);
+
+	return status;
+}
+
+/*
+ * suart routine to read the data from the RX FIFO
+ */
+s32 pru_softuart_read_data(struct device *dev, struct suart_handle *h_uart,
+				u8 *p_data_buffer, s32 max_len,
+					u32 *pdata_read)
+{
+	s16 ret_val = 0;
+	u8 *psrc_addr = NULL;
+	u32 data_read = 0;
+	u32 data_len = 0;
+	u32 char_len = 0;
+	u32 offset = 0;
+	u32 pru_offset;
+	u16 ch_num = h_uart->uart_num - 1;
+	u16 status = 0;
+
+	if (h_uart == NULL) {
+		WARN_ON(1);
+		return -EINVAL;
+	}
+	search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 2);
+
+	/* Get the data pos32er from channel RX data pointer */
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+						PRU_SUART_CH_TXRXDATA_OFFSET;
+	pruss_readb_multi(dev, offset, (u8 *) &psrc_addr, 4);
+
+	/* Reading data length from SUART channel register */
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+						PRU_SUART_CH_CONFIG2_OFFSET;
+	pruss_readw(dev, offset, (u16 *) &data_len);
+
+	/* read the character length */
+	char_len = data_len & PRU_SUART_CH_CONFIG2_BITPERCHAR_MASK;
+	char_len -= 2;	/* remove the START & STOP bit */
+
+	data_len &= PRU_SUART_CH_CONFIG2_DATALEN_MASK;
+	data_len = data_len >> PRU_SUART_CH_CONFIG2_DATALEN_SHIFT;
+	data_len++;
+
+	/* if the character length is greater than 8, then the size doubles */
+	if (char_len > 8)
+		data_len *= 2;
+
+	/* Check if the time-out had occured. If, yes, then we need to find the
+	 * number of bytes read from PRU. Else, we need to
+	 * read the requested bytes
+	 */
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+						PRU_SUART_CH_TXRXSTATUS_OFFSET;
+	pruss_readb(dev, offset, (u8 *) &status);
+	if (CHN_TXRX_STATUS_TIMEOUT == (status & CHN_TXRX_STATUS_TIMEOUT)) {
+		/* determine the number of bytes read s32o the FIFO */
+		offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL)
+				 + PRU_SUART_CH_BYTESDONECNTR_OFFSET;
+		pruss_readb(dev, offset, (u8 *) &data_read);
+
+		/* if the character length is greater than 8,
+				then the size doubles */
+		if (char_len > 8)
+			data_read *= 2;
+
+/*
+ * the data corresponding is loaded in second
+ * half during the timeout
+ */
+		if (data_read > data_len) {
+			data_read -= data_len;
+			psrc_addr += data_len;
+		}
+
+		pru_softuart_clr_rx_fifo(dev, h_uart);
+	} else {
+		data_read = data_len;
+/*
+ * if the bit is set, the data is in the first
+ * half of the FIFO else the data is in the second half
+ */
+		/* Determine the buffer index by reading FIFO_OddEven flag*/
+		if (status & CHN_TXRX_STATUS_CMPLT)
+			psrc_addr += data_len;
+	}
+
+	/* we should be copying only max len given by the application */
+	if (data_read > max_len)
+		data_read = max_len;
+
+/* evaluate the virtual address of the FIFO address
+ * based on the physical addr
+ */
+	psrc_addr = (u8 *)((u32) psrc_addr -
+		(u32) suart_iomap.p_fifo_buff_phys_base +
+		(u32) suart_iomap.p_fifo_buff_virt_base);
+
+	/* Now we have both the data length and the source address. copy */
+	for (offset = 0; offset < data_read; offset++)
+		*p_data_buffer++ = *psrc_addr++;
+	*pdata_read = data_read;
+	ret_val = 0;
+
+	return ret_val;
+}
+
+/*
+ * suart routine to disable the receive functionality.
+ * This routine stops the PRU from receiving on selected
+ * UART and also disables the McASP serializer corresponding
+ * to this UART Rx line.
+ */
+s32 pru_softuart_stop_receive(struct device *dev, struct suart_handle *h_uart)
+{
+	u16 ret_status = 0;
+	u32 offset;
+	u32 pru_offset;
+	u16 ch_num = h_uart->uart_num - 1;
+	u16 status;
+
+	if (h_uart == NULL) {
+		WARN_ON(1);
+		return -EINVAL;
+	}
+	search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 2);
+
+	/* read the existing value of status flag */
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+						PRU_SUART_CH_TXRXSTATUS_OFFSET;
+	pruss_readb(dev, offset, (u8 *) &status);
+
+	/* we need to clear the busy bit corresponding to receive channel */
+	status &= ~(CHN_TXRX_STATUS_RDY);
+	pruss_writeb(dev, offset, (u8) status);
+
+	/* get the serizlizer number being used for this Rx channel */
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+						PRU_SUART_CH_CTRL_OFFSET;
+	pruss_readw(dev, offset, (u16 *) &status);
+	status &= PRU_SUART_CH_CTRL_SR_MASK;
+	status = status >> PRU_SUART_CH_CTRL_SR_SHIFT;
+
+	/* we need to de-activate the serializer corresponding to this rx */
+	ret_status = suart_asp_serializer_deactivate(status, &suart_iomap);
+
+	return ret_status;
+}
+
+/*
+ * suart routine to get the tx status for a specific uart
+ */
+s32 pru_softuart_get_tx_status(struct device *dev, struct suart_handle *h_uart)
+{
+	u32 offset;
+	u32 pru_offset;
+	u16 status = 0;
+	u16 ch_num = h_uart->uart_num - 1;
+
+	if (h_uart == NULL) {
+		WARN_ON(1);
+		return -EINVAL;
+	}
+	search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 1);
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+					PRU_SUART_CH_TXRXSTATUS_OFFSET;
+	pruss_readb(dev, offset, (u8 *) &status);
+	return status;
+}
+
+s32 pru_softuart_clr_tx_status(struct device *dev, struct suart_handle *h_uart)
+{
+	u32 offset;
+	u32 pru_offset;
+	u16 status = 0;
+	u16 ch_num = h_uart->uart_num - 1;
+
+	if (h_uart == NULL) {
+		WARN_ON(1);
+		return -EINVAL;
+	}
+	search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 1);
+
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+					PRU_SUART_CH_TXRXSTATUS_OFFSET;
+	pruss_readb(dev, offset, (u8 *) &status);
+	status &= ~(0x2);
+	pruss_writeb(dev, offset, (u8) status);
+	return status;
+}
+
+/*
+ * suart routine to get the rx status for a specific uart
+ */
+s32 pru_softuart_get_rx_status(struct device *dev, struct suart_handle *h_uart)
+{
+	u32 offset;
+	u32 pru_offset;
+	u16 status = 0;
+	u16 ch_num = h_uart->uart_num - 1;
+
+	if (h_uart == NULL) {
+		WARN_ON(1);
+		return -EINVAL;
+	}
+	search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 2);
+
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+				PRU_SUART_CH_TXRXSTATUS_OFFSET;
+	pruss_readb(dev, offset, (u8 *) &status);
+	return status;
+}
+
+static s32 pru_softuart_clr_rx_fifo(struct device *dev,
+				struct suart_handle *h_uart)
+{
+	u32 offset;
+	u32 pru_offset;
+	u16 status = 0;
+	u16 ch_num = h_uart->uart_num - 1;
+	u16 reg_val;
+	u16 uart_num;
+
+	if (h_uart == NULL) {
+		WARN_ON(1);
+		return -EINVAL;
+	}
+	uart_num = h_uart->uart_num;
+	search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 2);
+	if (PRU0_MODE == PRU_MODE_RX_ONLY)
+		uart_num = 0;
+	else if (PRU1_MODE == PRU_MODE_RX_ONLY)
+		uart_num = 1;
+
+	/* Reset the number of bytes read into the FIFO */
+		offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL)
+					+ PRU_SUART_CH_BYTESDONECNTR_OFFSET;
+		pruss_readw(dev, offset, (u16 *) &reg_val);
+	reg_val &= 0x00;
+		pruss_writew(dev, offset, reg_val);
+
+
+	/* Service Request to PRU */
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+						PRU_SUART_CH_CTRL_OFFSET;
+	pruss_readw(dev, offset, (u16 *) &reg_val);
+	reg_val &= ~(PRU_SUART_CH_CTRL_MODE_MASK | PRU_SUART_CH_CTRL_SREQ_MASK);
+	reg_val |= (PRU_SUART_CH_CTRL_RX_MODE << PRU_SUART_CH_CTRL_MODE_SHIFT) |
+		(PRU_SUART_CH_CTRL_SREQ << PRU_SUART_CH_CTRL_SREQ_SHIFT);
+	pruss_writew(dev, offset, reg_val);
+	suart_intr_setmask(dev, h_uart->uart_num, PRU_RX_INTR,
+						CHN_TXRX_IE_MASK_TIMEOUT);
+
+	/* generate ARM->PRU event */
+	suart_arm_to_pru_intr(dev, uart_num);
+
+	return status;
+}
+
+s32 pru_softuart_clr_rx_status(struct device *dev, struct suart_handle *h_uart)
+{
+	u32 offset;
+	u32 pru_offset;
+	u16 status = 0;
+	u16 ch_num = h_uart->uart_num - 1;
+
+	if (h_uart == NULL) {
+		WARN_ON(1);
+		return -EINVAL;
+	}
+	search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 2);
+
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+			PRU_SUART_CH_TXRXSTATUS_OFFSET;
+	pruss_readb(dev, offset, (u8 *) &status);
+	status &= ~(0x3C);
+	pruss_writeb(dev, offset, (u8) status);
+	return status;
+}
+
+/*
+ * suart_s32r_status_read: Gets the Global Interrupt status register
+ * for the specified SUART.
+ * uart_num < 1 to 6 >
+ * txrx_flag < Indicates TX or RX s32errupt for the uart >
+ */
+s32 pru_softuart_get_isrstatus(struct device *dev, u16 uart_num, u16 *txrx_flag)
+{
+	u32 intc_offset;
+	u32 ch_num = 0xFF;
+	u32 reg_val = 0;
+	u32 reg_val2 = 0;
+	u32 ISR_value = 0;
+	u32 ack_reg_val = 0;
+	u32 stat_inx_clr_regoffset = 0;
+
+	/* initialize the status & Flag to known value */
+	*txrx_flag = 0;
+
+	stat_inx_clr_regoffset = (u32) (PRUSS_INTC_STATIDXCLR & 0xFFFF);
+
+	/* Read PRU Interrupt Status Register from PRU */
+	intc_offset = (u32) (PRUSS_INTC_STATCLRINT1 & 0xFFFF);
+
+	pruss_readl(dev, intc_offset, (u32 *)&ISR_value);
+	if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH)
+		|| (PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
+		/* Check if the interrupt occured for Tx */
+		ch_num = uart_num * 2 - 2;
+		reg_val2 = PRU_SUART0_TX_EVT_BIT << ((uart_num - 1) * 2);
+		if (ISR_value & reg_val2) {
+			/* interupt occured for TX */
+			*txrx_flag |= PRU_TX_INTR;
+			/* acknowledge the RX interrupt  */
+			ack_reg_val  = ch_num + PRU_SUART0_TX_EVT;
+			pruss_writel(dev, stat_inx_clr_regoffset,
+					ack_reg_val);
+		}
+
+		/* Check if the interrupt occured for Rx */
+		reg_val2 = PRU_SUART0_RX_EVT_BIT << ((uart_num - 1) * 2);
+		pruss_readl(dev, intc_offset, (u32 *)&ISR_value);
+		if (ISR_value & reg_val2) {
+			/* interupt occured for RX */
+			*txrx_flag |= PRU_RX_INTR;
+			ch_num += 1;
+
+			/* acknowledge the RX interrupt  */
+			ack_reg_val  = ch_num + PRU_SUART0_TX_EVT;
+			pruss_writel(dev, stat_inx_clr_regoffset,
+						ack_reg_val);
+		}
+	} else {
+		ch_num = uart_num - 1;
+		if ((ISR_value & 0x03FC) != 0) {
+			reg_val2 = 1 << (uart_num + 1);
+			if (ISR_value & reg_val2) {
+				/* acknowledge the s32errupt  */
+				ack_reg_val = ch_num + PRU_SUART0_TX_EVT;
+				pruss_writel(dev, stat_inx_clr_regoffset,
+					ack_reg_val);
+				*txrx_flag |= PRU_RX_INTR;
+			}
+		}
+		pruss_readl(dev, intc_offset, (u32 *)&ISR_value);
+		if (ISR_value & 0x3FC00) {
+			reg_val2 = 1 << (uart_num + 9);
+			if (ISR_value & reg_val2) {
+				/* acknowledge the s32errupt  */
+				ack_reg_val = ch_num + PRU_SUART4_TX_EVT;
+				pruss_writel(dev, stat_inx_clr_regoffset,
+					ack_reg_val);
+				*txrx_flag |= PRU_TX_INTR;
+			}
+		}
+	}
+	return reg_val;
+}
+
+s32 pru_intr_clr_isrstatus(struct device *dev, u16 uart_num, u32 txrxmode)
+{
+	u32 offset;
+	u16 txrx_flag = 0;
+	u16 chn_num;
+
+	chn_num = uart_num - 1;
+	if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH)
+	    || (PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
+		/* channel starts from 0 and uart instance starts from 1 */
+		chn_num = (uart_num * SUART_NUM_OF_CHANNELS_PER_SUART) - 2;
+		if (uart_num <= 4) {
+			/* PRU0 */
+			offset = PRU_SUART_PRU0_ISR_OFFSET + 1;
+		} else {
+			/* PRU1 */
+			offset = PRU_SUART_PRU1_ISR_OFFSET + 1;
+			/* First 8 channel corresponds to PRU0 */
+			chn_num -= 8;
+		}
+		if (2 == txrxmode)
+			chn_num++;
+	} else if (PRU0_MODE == txrxmode) {
+		offset = PRU_SUART_PRU0_ISR_OFFSET + 1;
+	} else if (PRU1_MODE == txrxmode) {
+		offset = PRU_SUART_PRU1_ISR_OFFSET + 1;
+	} else {
+		return 0;
+	}
+
+	pruss_readb(dev, offset, (u8 *) &txrx_flag);
+	txrx_flag &= ~(0x2);
+	pruss_writeb(dev, offset, (u8) txrx_flag);
+
+	return 0;
+}
+
+s32 suart_arm_to_pru_intr(struct device *dev, u16 uart_num)
+{
+	u32 value;
+
+	if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH)
+	    || (PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
+		if ((uart_num > 0) && (uart_num <= 4))
+			value = 0x20; /* PRU0 SYS_EVT32 */
+		else if ((uart_num > 4) && (uart_num <= 8))
+			value = 0x21; /* PRU0 SYS_EVT33 */
+		else
+			return -EINVAL;
+	}
+	if ((PRU0_MODE == PRU_MODE_RX_ONLY)
+				|| (PRU1_MODE == PRU_MODE_RX_ONLY)
+				|| (PRU0_MODE == PRU_MODE_TX_ONLY)
+				|| (PRU1_MODE == PRU_MODE_TX_ONLY)) {
+		if (uart_num == PRUSS_NUM0)
+			value = 0x20; /* PRU0 SYS_EVT32 */
+		else if (uart_num == PRUSS_NUM1)
+			value = 0x21; /* PRU0 SYS_EVT33 */
+		else
+			return -EINVAL;
+	}
+	return pruss_writel(dev, PRUSS_INTC_STATIDXSET, value);
+}
+
+static s32 arm_to_pru_intr_init(struct device *dev)
+{
+	u32 value;
+	u32 int_offset;
+
+	/* Clear all the host interrupts */
+	for (int_offset = 0; int_offset <= PRUSS_INTC_HOSTINTLVL_MAX;
+							int_offset++)
+		pruss_idx_writel(dev, PRUSS_INTC_HSTINTENIDXCLR, int_offset);
+
+	/* Enable the global s32errupt */
+	pruss_rmwl(dev, (u32) (PRUSS_INTC_GLBLEN & 0xFFFF), 0, 1);
+
+	/* Enable the Host interrupts for all host channels */
+	for (int_offset = 0; int_offset <= PRUSS_INTC_HOSTINTLVL_MAX;
+							 int_offset++)
+		pruss_rmwl(dev, (u32) (PRUSS_INTC_HSTINTENIDXSET & 0xFFFF),
+								0, int_offset);
+	pruss_rmwl(dev, (u32) (PRUSS_INTC_HOSTMAP0 & 0xFFFF),
+				PRU_INTC_REGMAP_MASK, PRU_INTC_HOSTMAP0_CHAN);
+	pruss_rmwl(dev, (u32) (PRUSS_INTC_HOSTMAP1 & 0xFFFF),
+				PRU_INTC_REGMAP_MASK, PRU_INTC_HOSTMAP1_CHAN);
+	pruss_rmwl(dev, (u32) (PRUSS_INTC_HOSTMAP2 & 0xFFFF),
+				PRU_INTC_REGMAP_MASK, PRU_INTC_HOSTMAP2_CHAN);
+
+	 /* MAP Channel 0 to SYS_EVT31 */
+	pruss_rmwl(dev, (u32) (PRUSS_INTC_CHANMAP7 & 0xFFFF),
+			PRU_INTC_REGMAP_MASK, PRU_INTC_CHANMAP7_SYS_EVT31);
+
+	if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH)
+	    || (PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
+		/* Sets the channels for the system interrupt */
+		pruss_rmwl(dev, (u32) (PRUSS_INTC_CHANMAP8 & 0xFFFF),
+				PRU_INTC_REGMAP_MASK, PRU_INTC_CHANMAP8_FULL);
+		pruss_rmwl(dev, (u32) (PRUSS_INTC_CHANMAP9 & 0xFFFF),
+				PRU_INTC_REGMAP_MASK, PRU_INTC_CHANMAP9_FULL);
+		pruss_rmwl(dev, (u32) (PRUSS_INTC_CHANMAP10 & 0xFFFF),
+				PRU_INTC_REGMAP_MASK, PRU_INTC_CHANMAP10_FULL);
+		pruss_rmwl(dev, (u32) (PRUSS_INTC_CHANMAP11 & 0xFFFF),
+				PRU_INTC_REGMAP_MASK, PRU_INTC_CHANMAP11_FULL);
+		pruss_rmwl(dev, (u32) (PRUSS_INTC_CHANMAP12 & 0xFFFF),
+				PRU_INTC_REGMAP_MASK, PRU_INTC_CHANMAP12_FULL);
+	}
+	if ((PRU0_MODE == PRU_MODE_RX_ONLY)
+			|| (PRU1_MODE == PRU_MODE_RX_ONLY)
+			|| (PRU0_MODE == PRU_MODE_TX_ONLY)
+			|| (PRU1_MODE == PRU_MODE_TX_ONLY)) {
+
+		/* Sets the channels for the system interrupt */
+		pruss_rmwl(dev, (u32) (PRUSS_INTC_CHANMAP8 & 0xFFFF),
+				PRU_INTC_REGMAP_MASK, PRU_INTC_CHANMAP8_HALF);
+		pruss_rmwl(dev, (u32) (PRUSS_INTC_CHANMAP9 & 0xFFFF),
+				PRU_INTC_REGMAP_MASK, PRU_INTC_CHANMAP9_HALF);
+		pruss_rmwl(dev, (u32) (PRUSS_INTC_CHANMAP10 & 0xFFFF),
+				PRU_INTC_REGMAP_MASK, PRU_INTC_CHANMAP10_HALF);
+		pruss_rmwl(dev, (u32) (PRUSS_INTC_CHANMAP11 & 0xFFFF),
+				PRU_INTC_REGMAP_MASK, PRU_INTC_CHANMAP11_HALF);
+		pruss_rmwl(dev, (u32) (PRUSS_INTC_CHANMAP12 & 0xFFFF),
+				PRU_INTC_REGMAP_MASK, PRU_INTC_CHANMAP12_HALF);
+	}
+
+	/* Clear required set of system events
+	* and enable them using indexed register
+	*/
+	for (int_offset = 0; int_offset < 18; int_offset++) {
+		value = 32 + int_offset;
+		pruss_idx_writel(dev, PRUSS_INTC_STATIDXCLR, value);
+	}
+
+	/* enable only the HOST to PRU interrupts and let the PRU to Host events
+	 * enabled by the separate API on demand basis.
+	 */
+	pruss_idx_writel(dev, PRUSS_INTC_ENIDXSET, 31);
+	pruss_idx_writel(dev, PRUSS_INTC_ENIDXSET, 32);
+	pruss_idx_writel(dev, PRUSS_INTC_ENIDXSET, 33);
+	pruss_idx_writel(dev, PRUSS_INTC_ENIDXSET, 50);
+	pruss_rmwl(dev, (u32) (PRUSS_INTC_GLBLEN & 0xFFFF), 0, 1);
+
+	/* Enable the Host interrupts for all host channels */
+	for (int_offset = 0; int_offset <= PRUSS_INTC_HOSTINTLVL_MAX;
+							int_offset++)
+		pruss_idx_writel(dev, PRUSS_INTC_HSTINTENIDXSET, int_offset);
+
+	return 0;
+}
+
+s32 suart_pru_to_host_intr_enable(struct device *dev, u16 uart_num,
+		u32 txrxmode, s32 flag)
+{
+	u32 chn_num;
+	u32 value;
+	s16 retval = 0;
+
+	if (uart_num > 8)
+		return -EINVAL;
+
+	chn_num = uart_num - 1;
+	if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH) ||
+		(PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
+		chn_num = (uart_num * 2) - 2;
+		if (2 == txrxmode)	/* Rx mode */
+			chn_num++;
+		value = 34 + chn_num;
+	} else if ((PRU_MODE_RX_ONLY == txrxmode)
+		&& (PRU0_MODE == PRU_MODE_RX_ONLY))
+		value = 34 + chn_num;
+	else if ((PRU_MODE_RX_ONLY == txrxmode)
+		&& (PRU1_MODE == PRU_MODE_RX_ONLY))
+		value = 42 + chn_num;
+	else if ((PRU_MODE_TX_ONLY == txrxmode)
+		&& (PRU0_MODE == PRU_MODE_TX_ONLY))
+		value = 34 + chn_num;
+	else if ((PRU_MODE_TX_ONLY == txrxmode)
+		&& (PRU1_MODE == PRU_MODE_TX_ONLY))
+		value = 42 + chn_num;
+	else
+		return -EINVAL;
+
+	retval = flag ? pruss_idx_writel(dev, PRUSS_INTC_ENIDXSET, value) :
+			pruss_idx_writel(dev, PRUSS_INTC_ENIDXCLR, value);
+	return retval;
+}
+
+s32 suart_intr_setmask(struct device *dev, u16 uart_num,
+		u32 txrxmode, u32 rmask)
+{
+	u32 offset;
+	u32 pru_offset;
+	u32 regval = 0;
+	u32 chn_num = uart_num - 1;
+
+	if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH)
+	    || (PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
+		/* channel starts from 0 and uart instance starts from 1 */
+		chn_num = (uart_num * SUART_NUM_OF_CHANNELS_PER_SUART) - 2;
+
+		if ((uart_num > 0) && (uart_num <= 4)) {
+			pru_offset = PRU_SUART_PRU0_CH0_OFFSET;
+			offset = PRU_SUART_PRU0_IMR_OFFSET;
+		} else if ((uart_num > 4) && (uart_num <= 8)) {
+			offset = PRU_SUART_PRU1_IMR_OFFSET;
+			pru_offset = PRU_SUART_PRU1_CH0_OFFSET;
+			chn_num -= 8;
+		} else {
+			return -EINVAL;
+		}
+		if (2 == txrxmode)
+			chn_num++;
+	} else if (PRU0_MODE == txrxmode) {
+		pru_offset = PRU_SUART_PRU0_CH0_OFFSET;
+		offset = PRU_SUART_PRU0_IMR_OFFSET;
+	} else if (PRU1_MODE == txrxmode) {
+		pru_offset = PRU_SUART_PRU1_CH0_OFFSET;
+		offset = PRU_SUART_PRU1_IMR_OFFSET;
+	} else
+		return 0;
+
+	regval = 1 << chn_num;
+	if (CHN_TXRX_IE_MASK_CMPLT == (rmask & CHN_TXRX_IE_MASK_CMPLT))
+		pruss_rmww(dev, offset, regval, regval);
+
+	if ((rmask & SUART_GBL_INTR_ERR_MASK) ==
+			SUART_GBL_INTR_ERR_MASK) {
+		regval = SUART_GBL_INTR_ERR_MASK;
+		pruss_rmww(dev, offset, regval, regval);
+	}
+
+	offset = pru_offset +
+		(chn_num * SUART_NUM_OF_BYTES_PER_CHANNEL)
+				+ PRU_SUART_CH_CONFIG1_OFFSET;
+	/* Framing Error Interrupt Masked */
+	if ((rmask & CHN_TXRX_IE_MASK_FE) == CHN_TXRX_IE_MASK_FE) {
+		regval = 0;
+		pruss_readw(dev, offset, (u16 *) &regval);
+		regval &= ~(CHN_TXRX_IE_MASK_FE);
+		regval |= CHN_TXRX_IE_MASK_FE;
+		pruss_writew(dev, offset, (u16) regval);
+	}
+
+	/* Break Indicator Interrupt Masked */
+	if (CHN_TXRX_IE_MASK_BI == (rmask & CHN_TXRX_IE_MASK_BI)) {
+		regval = 0;
+		pruss_readw(dev, offset, (u16 *) &regval);
+		regval &= ~(CHN_TXRX_IE_MASK_BI);
+		regval |= CHN_TXRX_IE_MASK_BI;
+		pruss_writew(dev, offset, (u16) regval);
+	}
+
+	/* Timeout error Interrupt Masked */
+	if (CHN_TXRX_IE_MASK_TIMEOUT ==
+			(rmask & CHN_TXRX_IE_MASK_TIMEOUT)) {
+		regval = 0;
+		pruss_readw(dev, offset, (u16 *) &regval);
+		regval &= ~(CHN_TXRX_IE_MASK_TIMEOUT);
+		regval |= CHN_TXRX_IE_MASK_TIMEOUT;
+		pruss_writew(dev, offset, (u16) regval);
+	}
+	return 0;
+}
+
+s32 suart_intr_clrmask(struct device *dev, u16 uart_num,
+		u32 txrxmode, u32 rmask)
+{
+	u32 offset;
+	u32 pru_offset;
+	u16 regval = 0;
+	u16 chn_num;
+
+	chn_num = uart_num - 1;
+	if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH)
+	    || (PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
+		/* channel starts from 0 and uart instance starts from 1 */
+		chn_num = (uart_num * SUART_NUM_OF_CHANNELS_PER_SUART) - 2;
+		if ((uart_num > 0) && (uart_num <= 4)) {
+			pru_offset = PRU_SUART_PRU0_CH0_OFFSET;
+			offset = PRU_SUART_PRU0_IMR_OFFSET;
+		} else if ((uart_num > 4) && (uart_num <= 8)) {
+			/* PRU1 */
+			offset = PRU_SUART_PRU1_IMR_OFFSET;
+			pru_offset = PRU_SUART_PRU1_CH0_OFFSET;
+			/* First 8 channel corresponds to PRU0 */
+			chn_num -= 8;
+		} else
+			return -EINVAL;
+		if (2 == txrxmode)
+			chn_num++;
+	} else if (PRU0_MODE == txrxmode) {
+		pru_offset = PRU_SUART_PRU0_CH0_OFFSET;
+		offset = PRU_SUART_PRU0_IMR_OFFSET;
+	} else if (PRU1_MODE == txrxmode) {
+		pru_offset = PRU_SUART_PRU1_CH0_OFFSET;
+		offset = PRU_SUART_PRU1_IMR_OFFSET;
+	} else
+		return 0;
+
+	regval = 1 << chn_num;
+	if (CHN_TXRX_IE_MASK_CMPLT == (rmask & CHN_TXRX_IE_MASK_CMPLT))
+		pruss_rmww(dev, offset, regval, 0);
+
+	if ((rmask & SUART_GBL_INTR_ERR_MASK) == SUART_GBL_INTR_ERR_MASK)
+		pruss_rmww(dev, offset, SUART_GBL_INTR_ERR_MASK, 0);
+
+	offset = pru_offset +
+		(chn_num * SUART_NUM_OF_BYTES_PER_CHANNEL)
+				+ PRU_SUART_CH_CONFIG1_OFFSET;
+
+	/* Framing Error Interrupt Masked */
+	if ((rmask & CHN_TXRX_IE_MASK_FE) == CHN_TXRX_IE_MASK_FE) {
+		regval = 0;
+		pruss_readw(dev, offset, (u16 *) &regval);
+		regval &= ~(CHN_TXRX_IE_MASK_FE);
+		pruss_writew(dev, offset, regval);
+	}
+
+	/* Break Indicator Interrupt Masked */
+	if (CHN_TXRX_IE_MASK_BI == (rmask & CHN_TXRX_IE_MASK_BI)) {
+		regval = 0;
+		pruss_readw(dev, offset, (u16 *) &regval);
+		regval &= ~(CHN_TXRX_IE_MASK_BI);
+		pruss_writew(dev, offset, regval);
+	}
+
+	/* Timeout error Interrupt Masked */
+	if (CHN_TXRX_IE_MASK_TIMEOUT ==
+			(rmask & CHN_TXRX_IE_MASK_TIMEOUT)) {
+		regval = 0;
+		pruss_readw(dev, offset, (u16 *) &regval);
+		regval &= ~(CHN_TXRX_IE_MASK_TIMEOUT);
+		pruss_writew(dev, offset, regval);
+	}
+	return 0;
+}
+
+s32 suart_intr_getmask(struct device *dev, u16 uart_num,
+				u32 txrxmode, u32 rmask)
+{
+	u16 chn_num;
+	u32 offset;
+	u16 txrx_flag;
+	u16 regval = 1;
+
+	chn_num = uart_num - 1;
+	if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH)
+	    || (PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
+		/* channel starts from 0 and uart instance starts from 1 */
+		chn_num = (uart_num * SUART_NUM_OF_CHANNELS_PER_SUART) - 2;
+
+		if ((uart_num > 0) && (uart_num <= 4)) {
+
+			offset = PRU_SUART_PRU0_IMR_OFFSET;
+		} else if ((uart_num > 4) && (uart_num <= 8)) {
+			/* PRU1 */
+			offset = PRU_SUART_PRU1_IMR_OFFSET;
+			/* First 8 channel corresponds to PRU0 */
+			chn_num -= 8;
+		} else
+			return -EINVAL;
+
+		if (2 == txrxmode)
+			chn_num++;
+
+	} else if (PRU0_MODE == txrxmode)
+		offset = PRU_SUART_PRU0_IMR_OFFSET;
+	else if (PRU1_MODE == txrxmode)
+		offset = PRU_SUART_PRU1_IMR_OFFSET;
+	else
+		return 0;
+
+	regval = regval << chn_num;
+	pruss_readw(dev, offset, (u16 *) &txrx_flag);
+	txrx_flag &= regval;
+
+	if ((rmask && (txrx_flag == regval)) || (!rmask && !txrx_flag))
+		return 1;
+
+	return 0;
+}
diff --git a/drivers/tty/serial/pruss_suart_utils.c b/drivers/tty/serial/pruss_suart_utils.c
new file mode 100644
index 0000000..5ee340e
--- /dev/null
+++ b/drivers/tty/serial/pruss_suart_utils.c
@@ -0,0 +1,393 @@
+/*
+ * Copyright (C) 2010, 2011 Texas Instruments Incorporated
+ * Author: Jitendra Kumar <jitendra@mistralsolutions.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as  published by the
+ * Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
+ * whether express or implied; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+
+
+#include <linux/mfd/pruss.h>
+#include "pruss_suart.h"
+
+#define SUART_TRX_DIV_CONF_SZ	4
+
+static s16 suart_mcasp_tx_baud_set(u32 tx_baud_value,
+			struct pruss_suart_iomap *pruss_ioaddr);
+static s16 suart_mcasp_rx_baud_set(u32 rx_baud_value, u32 oversampling,
+			struct pruss_suart_iomap *pruss_ioaddr);
+
+/*
+ * Lookup table for TX baud rate
+ * The divisor value is calculated using the formula
+ *
+ * ACLKX = (AUXCLK)/(CLKXDIV * HCLKXDIV)
+ *
+ * Where
+ *		CLKXDIV takes values from 1-32
+ *		HCLKXDIV takes values from 1-4096
+ * Here
+ *		AUXCLK = 24MHz
+ */
+static u32 lt_tx_baud_rate[][SUART_TRX_DIV_CONF_SZ] = {
+	/*BaudRate,	Divisor,	CLKXDIV,HCLKXDIV */
+	{300,		80000,		24,		3200},
+	{600,		40000,		15,		2500},
+	{1800,		13333,		10,		1212},
+	{2400,		10000,		4,		2000},
+	{4800,		5000,		1,		2500},
+	{7200,		3333,		0,		3333},
+	{9600,		2500,		0,		2500},
+	{14400,		1666,		0,		1666},
+	{19200,		1250,		0,		1250},
+	{38400,		625,		0,		625},
+	{57600,		416,		0,		416},
+	{115200,	208,		0,		208},
+	{230400,	104,		0,		104}
+};
+
+/*
+ * Lookup table for RX baud rate for 8 bit oversampling
+ * The divisor value is calculated using the formula
+ *
+ *	ACLKR = (AUXCLK)/(CLKRDIV * HCLKRDIV) * Oversampling
+ *
+ * Where
+ *		CLKRDIV takes values from 1-32
+ *		HCLKRDIV takes values from 1-4096
+ * Here
+ *		AUXCLK = 24MHz
+ */
+static u32 lt_rx_8x_baud_rate[][SUART_TRX_DIV_CONF_SZ] = {
+/* BaudRate,	Divisor,	CLKXDIV,	HCLKXDIV */
+	{300,		10000,		4,		2000},
+	{600,		5000,		1,		2500},
+	{1800,		1667,		0,		1667},
+	{2400,		1250,		0,		1250},
+	{7200,		417,		0,		417},
+	{4800,		625,		0,		625},
+	{9600,		312,		0,		312},
+	{14400,		208,		0,		208},
+	{19200,		156,		0,		156},
+	{38400,		78,		0,		78},
+	{57600,		52,		0,		52},
+	{115200,	26,		0,		26},
+	{230400,	13,		0,		13}
+};
+
+/*
+ * Lookup table for RX baud rate for 16 bit oversampling
+ * The divisor value is calculated using the formula
+ *
+ *	ACLKR = (AUXCLK)/(CLKRDIV * HCLKRDIV) * Oversampling
+ *
+ * Where
+ *		CLKRDIV takes values from 1-32
+ *		HCLKRDIV takes values from 1-4096
+ * Here
+ *		AUXCLK = 24MHz
+ */
+static u32 lt_rx_16x_baud_rate[][SUART_TRX_DIV_CONF_SZ] = {
+/*BaudRate,	Divisor,	CLKXDIV,	HCLKXDIV */
+	{300,		5000,		1,		2500},
+	{600,		2500,		0,		2500},
+	{1800,		833,		0,		833},
+	{2400,		625,		0,		625},
+	{4800,		312,		0,		312},
+	{7200,		208,		0,		208},
+	{9600,		156,		0,		156},
+	{14400,		104,		0,		104},
+	{19200,		78,		0,		78},
+	{38400,		39,		0,		39},
+	{57600,		26,		0,		26},
+	{115200,	13,		0,		13},
+	{230400,	6,		0,		6}
+};
+
+/*
+ * McASP configuration routine
+ */
+
+void suart_mcasp_reset(struct pruss_suart_iomap *pruss_ioaddr)
+{
+	struct omapl_mcasp_regs_ovly __iomem *mcasp0_regs =
+					pruss_ioaddr->mcasp_io_addr;
+	/* reset mcasp. */
+	iowrite32(MCASP_SUART_GBLCTL, &mcasp0_regs->gblctl);
+	iowrite32(MCASP_SUART_RGBLCTL, &mcasp0_regs->rgblctl);
+	iowrite32(MCASP_SUART_XGBLCTL, &mcasp0_regs->xgblctl);
+	iowrite32(MCASP_SUART_XSTAT, &mcasp0_regs->xstat);
+	iowrite32(MCASP_SUART_RSTAT, &mcasp0_regs->rstat);
+}
+
+void suart_mcasp_config(u32 tx_baud_value,
+			u32 rx_baud_value,
+			u32 oversampling,
+			struct pruss_suart_iomap *pruss_ioaddr)
+{
+	struct omapl_mcasp_regs_ovly __iomem *mcasp0_regs =
+					pruss_ioaddr->mcasp_io_addr;
+	u32 temp_reg;
+
+	/* reset mcasp */
+	iowrite32(MCASP_SUART_GBLCTL, &mcasp0_regs->gblctl);
+	iowrite32(MCASP_SUART_RGBLCTL, &mcasp0_regs->rgblctl);
+	iowrite32(MCASP_SUART_XGBLCTL, &mcasp0_regs->xgblctl);
+
+	/* configure receive registers */
+	if ((SUART_8X_OVRSMPL == oversampling) || (0 == oversampling)) {
+		iowrite32(MCASP_SUART_RMASK_8, &mcasp0_regs->rmask);
+		iowrite32(MCASP_SUART_RFMT_8, &mcasp0_regs->rfmt);
+	}
+	if (SUART_16X_OVRSMPL == oversampling) {
+		iowrite32(MCASP_SUART_RMASK_16, &mcasp0_regs->rmask);
+		iowrite32(MCASP_SUART_RFMT_16, &mcasp0_regs->rfmt);
+
+	}
+
+	iowrite32(MCASP_SUART_FSRM, &mcasp0_regs->afsrctl);
+	iowrite32(MCASP_SUART_CLKRM_CLKRP, &mcasp0_regs->aclkrctl);
+	iowrite32(MCASP_SUART_HCLKRP, &mcasp0_regs->ahclkrctl);
+	suart_mcasp_rx_baud_set(rx_baud_value, oversampling, pruss_ioaddr);
+	iowrite32(MCASP_SUART_RTDMS0, &mcasp0_regs->rtdm);
+	iowrite32(MCASP_SUART_RSYNCERR, &mcasp0_regs->rintctl);
+	iowrite32(MCASP_SUART_RMAX_RPS_256, &mcasp0_regs->rclkchk);
+
+	/* configure transmit registers. */
+	iowrite32(MCASP_SUART_XMASK_0_31, &mcasp0_regs->xmask);
+	iowrite32(MCASP_SUART_XBUSEL_XSSZ_16_XPAD_0, &mcasp0_regs->xfmt);
+	iowrite32(MCASP_SUART_FSXM, &mcasp0_regs->afsxctl);
+	iowrite32(MCASP_SUART_CLKXM_ASYNC_CLKXP, &mcasp0_regs->aclkxctl);
+	iowrite32(MCASP_SUART_HCLKXM, &mcasp0_regs->ahclkxctl);
+
+	suart_mcasp_tx_baud_set(tx_baud_value, pruss_ioaddr);
+	iowrite32(MCASP_SUART_XTDMS0, &mcasp0_regs->xtdm);
+	iowrite32(MCASP_SUART_XSYNCERR, &mcasp0_regs->xintctl);
+	iowrite32(MCASP_SUART_XMAX_XPS_256, &mcasp0_regs->xclkchk);
+
+	/* Serializer as a transmitter */
+	iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl0);
+	iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl1);
+	iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl2);
+	iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl3);
+	iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl4);
+	iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl5);
+	iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl6);
+	iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl7);
+	iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl8);
+	iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl9);
+	iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl10);
+	iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl11);
+	iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl12);
+	iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl13);
+	iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl14);
+	iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl15);
+
+	/* Configure all AXR[n] as McASP pins  */
+
+	/*
+	 *  Setting  all TX MCASP AXR[n] Pin mapped to Even Serializer number
+	 *  (0,2,4,6,8,10,12,14) to GPIO Mode by default. During setting the
+	 *  serializer to TX mode in PRU assembly code, the MCASP AXR[n] Pin
+	 *  would get configured to MCASP mode of operation,
+	 *  before Actual Data Transfer
+	 */
+
+	/* Setting  all TX Pin to GPIO Mode by default */
+	temp_reg = (OMAPL_MCASP_PFUNC_RESETVAL) |
+	    (1 << PRU_SUART0_CONFIG_TX_SER) | (1 << PRU_SUART1_CONFIG_TX_SER) |
+	    (1 << PRU_SUART2_CONFIG_TX_SER) | (1 << PRU_SUART3_CONFIG_TX_SER) |
+	    (1 << PRU_SUART4_CONFIG_TX_SER) | (1 << PRU_SUART5_CONFIG_TX_SER) |
+	    (1 << PRU_SUART6_CONFIG_TX_SER) | (1 << PRU_SUART7_CONFIG_TX_SER);
+	iowrite32(temp_reg, &mcasp0_regs->pfunc);
+
+	iowrite32(0xFFF, &mcasp0_regs->pdout);
+
+	/* config pin function and direction */
+	iowrite32(0x00000000, &mcasp0_regs->pdir);
+	temp_reg =
+	    (1 << PRU_SUART0_CONFIG_TX_SER) | (1 << PRU_SUART1_CONFIG_TX_SER) |
+	    (1 << PRU_SUART2_CONFIG_TX_SER) | (1 << PRU_SUART3_CONFIG_TX_SER) |
+	    (1 << PRU_SUART4_CONFIG_TX_SER) | (1 << PRU_SUART5_CONFIG_TX_SER) |
+	    (1 << PRU_SUART6_CONFIG_TX_SER) | (1 << PRU_SUART7_CONFIG_TX_SER) |
+	    (MCASP_PDIR_VAL);
+	iowrite32(temp_reg, &mcasp0_regs->pdir);
+
+	iowrite32(MCASP_SUART_DIT_DISABLE, &mcasp0_regs->ditctl);
+	iowrite32(MCASP_SUART_LOOPBACK_DISABLE, &mcasp0_regs->dlbctl);
+	iowrite32(MCASP_SUART_AMUTE_DISABLE, &mcasp0_regs->amute);
+
+	iowrite32(MCASP_SUART_XSTAT, &mcasp0_regs->xstat);
+	iowrite32(MCASP_SUART_RSTAT, &mcasp0_regs->rstat);
+}
+
+void suart_mcasp_tx_serialzier_set(u32 serializer_num,
+		struct pruss_suart_iomap *pruss_ioaddr)
+{
+	struct omapl_mcasp_regs_ovly __iomem *mcasp0_regs =
+					pruss_ioaddr->mcasp_io_addr;
+	u32 temp_reg;
+	temp_reg = ioread32(&mcasp0_regs->pfunc);
+	temp_reg |= (0x1 << serializer_num);
+	iowrite32(temp_reg, &mcasp0_regs->pfunc);
+}
+
+/*
+ * mcasp TX buard rate setting routine
+ */
+static s16 suart_mcasp_tx_baud_set(u32 tx_baud_value,
+		struct pruss_suart_iomap *pruss_ioaddr)
+{
+	u32 clk_div_val;
+	u32 loop_cnt;
+	s16 status = 0;
+	s16 found_val = false;
+
+	struct omapl_mcasp_regs_ovly __iomem *mcasp0_regs =
+					pruss_ioaddr->mcasp_io_addr;
+	u32 temp_reg;
+
+	/* Search the supported baud rate in the table */
+	for (loop_cnt = 0; loop_cnt < SUART_NUM_OF_BAUDS_SUPPORTED;
+							loop_cnt++) {
+		if (tx_baud_value == lt_tx_baud_rate[loop_cnt][0]) {
+			found_val = true;
+			break;
+		}
+	}
+	if (found_val == true) {
+		clk_div_val = lt_tx_baud_rate[loop_cnt][2];
+		temp_reg = ioread32(&mcasp0_regs->aclkxctl);
+		temp_reg |= (clk_div_val <<
+					OMAPL_MCASP_ACLKXCTL_CLKXDIV_SHIFT);
+		iowrite32(temp_reg, &mcasp0_regs->aclkxctl);
+		clk_div_val = lt_tx_baud_rate[loop_cnt][3];
+		temp_reg = ioread32(&mcasp0_regs->ahclkxctl);
+		temp_reg |= (clk_div_val <<
+					OMAPL_MCASP_AHCLKXCTL_HCLKXDIV_SHIFT);
+		iowrite32(temp_reg, &mcasp0_regs->ahclkxctl);
+	} else {
+		return -EINVAL ;
+	}
+	return status;
+}
+
+/*
+ * mcasp RX buard rate setting routine
+ */
+static s16 suart_mcasp_rx_baud_set(u32 rx_baud_value,
+	u32 oversampling, struct pruss_suart_iomap *pruss_ioaddr)
+{
+	u32 clk_div_val = 0;
+	u32 loop_cnt = 0;
+	s16 status = 0;
+	u32 temp_reg = 0;
+	struct omapl_mcasp_regs_ovly __iomem *mcasp0_regs =
+					pruss_ioaddr->mcasp_io_addr;
+
+	switch (oversampling) {
+	case SUART_8X_OVRSMPL:
+		for (loop_cnt = 0; loop_cnt < SUART_NUM_OF_BAUDS_SUPPORTED;
+		     loop_cnt++) {
+			if (rx_baud_value == lt_rx_8x_baud_rate[loop_cnt][0]) {
+				clk_div_val = lt_rx_8x_baud_rate[loop_cnt][2];
+				temp_reg = ioread32(&mcasp0_regs->aclkrctl);
+				temp_reg |= (clk_div_val <<
+					OMAPL_MCASP_ACLKXCTL_CLKXDIV_SHIFT);
+				iowrite32(temp_reg, &mcasp0_regs->aclkrctl);
+
+				clk_div_val =
+				lt_rx_8x_baud_rate[loop_cnt][3] - 1;
+
+				temp_reg = ioread32(&mcasp0_regs->ahclkrctl);
+				temp_reg |= (clk_div_val <<
+					OMAPL_MCASP_AHCLKXCTL_HCLKXDIV_SHIFT);
+				iowrite32(temp_reg, &mcasp0_regs->ahclkrctl);
+				break;
+			}
+		}
+		status = -EINVAL;
+		break;
+	case SUART_16X_OVRSMPL:
+		for (loop_cnt = 0; loop_cnt < SUART_NUM_OF_BAUDS_SUPPORTED;
+		     loop_cnt++) {
+			if (rx_baud_value == lt_rx_16x_baud_rate[loop_cnt][0]) {
+				clk_div_val = lt_rx_16x_baud_rate[loop_cnt][2];
+				temp_reg = ioread32(&mcasp0_regs->aclkrctl);
+				temp_reg |= (clk_div_val <<
+					OMAPL_MCASP_ACLKXCTL_CLKXDIV_SHIFT);
+				iowrite32(temp_reg, &mcasp0_regs->aclkrctl);
+				clk_div_val = lt_rx_16x_baud_rate[loop_cnt][3];
+				temp_reg = ioread32(&mcasp0_regs->ahclkrctl);
+				temp_reg |= (clk_div_val <<
+					OMAPL_MCASP_AHCLKXCTL_HCLKXDIV_SHIFT);
+				iowrite32(temp_reg, &mcasp0_regs->ahclkrctl);
+				break;
+			}
+		}
+		status = -EINVAL;
+		break;
+	case SUART_TX_OVRSMPL:
+		for (loop_cnt = 0; loop_cnt < SUART_NUM_OF_BAUDS_SUPPORTED;
+		     loop_cnt++) {
+			if (rx_baud_value == lt_tx_baud_rate[loop_cnt][0]) {
+				clk_div_val = lt_tx_baud_rate[loop_cnt][2];
+				temp_reg = ioread32(&mcasp0_regs->aclkrctl);
+				temp_reg |= (clk_div_val <<
+					OMAPL_MCASP_ACLKXCTL_CLKXDIV_SHIFT);
+				iowrite32(temp_reg, &mcasp0_regs->aclkrctl);
+				clk_div_val = lt_tx_baud_rate[loop_cnt][3];
+				temp_reg = ioread32(&mcasp0_regs->ahclkrctl);
+				temp_reg |= (clk_div_val <<
+					OMAPL_MCASP_AHCLKXCTL_HCLKXDIV_SHIFT);
+				iowrite32(temp_reg, &mcasp0_regs->ahclkrctl);
+				break;
+			}
+		}
+		status = -EINVAL;
+		break;
+	default:
+		status = -EINVAL;
+		break;
+	}
+
+	return status;
+}
+
+/*
+ * mcasp buard rate setting routine
+ */
+s16 suart_asp_baud_set(u32 tx_baud_value, u32 rx_baud_value, u32 oversampling,
+					struct pruss_suart_iomap *pruss_ioaddr)
+{
+	s16 status = 0;
+
+	status = suart_mcasp_tx_baud_set(tx_baud_value, pruss_ioaddr);
+	status = suart_mcasp_rx_baud_set(rx_baud_value, oversampling,
+					pruss_ioaddr);
+
+	return status;
+}
+
+/*
+ * mcasp deactivate the selected serializer
+ */
+s16 suart_asp_serializer_deactivate(u16 sr_num,
+		struct pruss_suart_iomap *pruss_ioaddr)
+{
+	s16 status = 0;
+	struct omapl_mcasp_regs_ovly __iomem *mcasp0_regs =
+		 pruss_ioaddr->mcasp_io_addr;
+	if (sr_num > 15)
+		status = -EINVAL;
+	else
+		iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl0);
+
+	return status;
+}
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 758c5b0..eae37fe 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -202,6 +202,8 @@
 /* VIA VT8500 SoC */
 #define PORT_VT8500	97
 
+#define PORT_DA8XX_PRU_SUART	98
+
 #ifdef __KERNEL__
 
 #include <linux/compiler.h>
-- 
1.7.2.3

[PATCH v4 08/11] tty: add pruss SUART driver

[Subhasish Ghosh]

This patch adds support for the TTY compliant
Soft-UART device emulated on PRUSS.

This patch depends on:
davinci: macro rename DA8XX_LPSC0_DMAX to DA8XX_LPSC0_PRUSS.
            https://patchwork.kernel.org/patch/615681/
davinci: changed SRAM allocator to shared ram.
            https://patchwork.kernel.org/patch/549351/

Signed-off-by: Subhasish Ghosh <subhasish@mistralsolutions.com>
---
 drivers/tty/serial/Kconfig             |   18 +
 drivers/tty/serial/Makefile            |    6 +
 drivers/tty/serial/pruss_suart.c       | 1061 ++++++++++++++++++++
 drivers/tty/serial/pruss_suart.h       | 1038 +++++++++++++++++++
 drivers/tty/serial/pruss_suart_api.c   | 1710 ++++++++++++++++++++++++++++++++
 drivers/tty/serial/pruss_suart_utils.c |  393 ++++++++
 include/linux/serial_core.h            |    2 +
 7 files changed, 4228 insertions(+), 0 deletions(-)
 create mode 100644 drivers/tty/serial/pruss_suart.c
 create mode 100644 drivers/tty/serial/pruss_suart.h
 create mode 100644 drivers/tty/serial/pruss_suart_api.c
 create mode 100644 drivers/tty/serial/pruss_suart_utils.c

diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index 2b83346..6c26ebf 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -1596,4 +1596,22 @@ config SERIAL_PCH_UART
 	  This driver is for PCH(Platform controller Hub) UART of Intel EG20T
 	  which is an IOH(Input/Output Hub) for x86 embedded processor.
 	  Enabling PCH_DMA, this PCH UART works as DMA mode.
+
+config SERIAL_PRUSS_SUART
+	depends on ARCH_DAVINCI && ARCH_DAVINCI_DA850
+	select SERIAL_CORE
+	tristate "PRUSS based SoftUART emulation on DA8XX"
+	---help---
+	This driver emulates up to eight different UARTs on the PRUSS.
+	You may modify the NR_SUARTS macro in the driver to emulate
+	less number of UARTS as per your requirement.
+	If not sure, mark No
+
+config PRUSS_SUART_MCASP
+	depends on ARCH_DAVINCI_DA830 && SERIAL_PRUSS_SUART
+	default "0"
+	int "McASP number"
+	---help---
+	Enter the McASP number to use with SUART (0, 1 or 2).
+	You will need to recompile the kernel if this is changed.
 endmenu
diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile
index 8ea92e9..e1eaaf3 100644
--- a/drivers/tty/serial/Makefile
+++ b/drivers/tty/serial/Makefile
@@ -92,3 +92,9 @@ obj-$(CONFIG_SERIAL_MRST_MAX3110)	+= mrst_max3110.o
 obj-$(CONFIG_SERIAL_MFD_HSU)	+= mfd.o
 obj-$(CONFIG_SERIAL_IFX6X60)  	+= ifx6x60.o
 obj-$(CONFIG_SERIAL_PCH_UART)	+= pch_uart.o
+
+pruss_uart-objs :=	pruss_suart.o \
+			pruss_suart_api.o \
+			pruss_suart_utils.o
+
+obj-$(CONFIG_SERIAL_PRUSS_SUART) += pruss_uart.o
diff --git a/drivers/tty/serial/pruss_suart.c b/drivers/tty/serial/pruss_suart.c
new file mode 100644
index 0000000..37c3c21
--- /dev/null
+++ b/drivers/tty/serial/pruss_suart.c
@@ -0,0 +1,1061 @@
+/*
+ * PRUSS SUART Emulation device driver
+ * Author: subhasish at mistralsolutions.com
+ *
+ * This driver supports TI's PRU SUART Emulation and the
+ * specs for the same is available at <http://www.ti.com>
+ *
+ * Copyright (C) 2010, 2011 Texas Instruments Incorporated <http://www.ti.com/>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed as is WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/tty_flip.h>
+#include <linux/serial.h>
+#include <linux/serial_core.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/firmware.h>
+#include <linux/clk.h>
+#include <linux/serial_reg.h>
+#include <linux/delay.h>
+#include <linux/bitops.h>
+#include <mach/sram.h>
+#include "pruss_suart.h"
+
+#define NR_SUART			8
+#define DRV_NAME			"da8xx_pruss_uart"
+#define DRV_DESC			"PRUSS SUART Driver v1.0"
+#define MAX_SUART_RETRIES		100
+#define SUART_CNTX_SZ			512
+#define SUART_FIFO_TIMEOUT_DFLT		5
+#define SUART_FIFO_TIMEOUT_MIN		4
+#define SUART_FIFO_TIMEOUT_MAX		500
+
+/* Default timeout set to 5ms */
+static s16 suart_timeout = SUART_FIFO_TIMEOUT_DFLT;
+module_param(suart_timeout, short, S_IRUGO);
+MODULE_PARM_DESC(suart_timeout,
+		 "fifo timeout in milli seconds (min: 4; max: 500)");
+
+struct suart_fifo {
+	void *fifo_vaddr_buff_tx;
+	void *fifo_vaddr_buff_rx;
+	void *fifo_phys_addr_tx;
+	void *fifo_phys_addr_rx;
+};
+
+struct omapl_pru_suart {
+	struct uart_port port[NR_SUART];
+	struct device *dev;
+	unsigned long tx_empty[NR_SUART];
+	struct clk *clk_mcasp;
+	struct suart_fifo suart_fifo_addr[NR_SUART];
+	struct suart_handle suart_hdl[NR_SUART];
+	struct pruss_suart_iomap suart_iomap;
+	struct tasklet_struct tx_task[NR_SUART];
+	u32 clk_freq_pru;
+	u32 clk_freq_mcasp;
+	u32 tx_loadsz;
+};
+
+static u32 suart_get_duplex(struct omapl_pru_suart *soft_uart, u32 uart_no)
+{
+	return soft_uart->suart_hdl[uart_no].uart_type;
+}
+
+static inline void __stop_tx(struct omapl_pru_suart *soft_uart, u32 uart_no)
+{
+	struct device *dev = soft_uart->dev;
+	unsigned long flags = 0;
+	struct uart_port *port = &soft_uart->port[uart_no];
+	u16 txready;
+	u32 i;
+
+	/* Check if any TX in progress */
+	for (i = 0, txready = 1; (i < 10000) && txready; i++) {
+		txready = (pru_softuart_get_tx_status
+			(dev, &soft_uart->suart_hdl[uart_no]) &
+				CHN_TXRX_STATUS_RDY);
+	}
+	/* To stop tx, disable the TX interrupt */
+	spin_lock_irqsave(&port->lock, flags);
+	suart_intr_clrmask(dev, soft_uart->suart_hdl[uart_no].uart_num,
+				PRU_TX_INTR, CHN_TXRX_IE_MASK_CMPLT);
+	pru_softuart_clr_tx_status(dev, &soft_uart->suart_hdl[uart_no]);
+	spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void pruss_suart_stop_tx(struct uart_port *port)
+{
+	struct omapl_pru_suart *soft_uart =
+	    container_of(port, struct omapl_pru_suart, port[port->line]);
+
+	__stop_tx(soft_uart, port->line);
+}
+
+static void omapl_pru_tx_chars(struct omapl_pru_suart *soft_uart, u32 uart_no)
+{
+	struct circ_buf *xmit = &soft_uart->port[uart_no].state->xmit;
+	struct device *dev = soft_uart->dev;
+	s32 count = 0;
+
+	if (!(suart_get_duplex(soft_uart, uart_no) & ePRU_SUART_HALF_TX))
+		return;
+
+	if (uart_circ_empty(xmit) ||
+			uart_tx_stopped(&soft_uart->port[uart_no])) {
+		pruss_suart_stop_tx(&soft_uart->port[uart_no]);
+		set_bit(0, &soft_uart->tx_empty[uart_no]);
+		return;
+	}
+
+	for (count = 0; count <= soft_uart->tx_loadsz; count++) {
+		*((s8 *)soft_uart->suart_fifo_addr[uart_no].fifo_vaddr_buff_tx
+		+ count) = xmit->buf[xmit->tail];
+		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
+		soft_uart->port[uart_no].icount.tx++;
+		if (uart_circ_empty(xmit)) {
+			uart_circ_clear(xmit);
+			break;
+		}
+	}
+
+	if (count == (SUART_FIFO_LEN + 1))
+		count = SUART_FIFO_LEN;
+
+	/* Write the character to the data port */
+	if (pru_softuart_write(dev,
+		&soft_uart->suart_hdl[uart_no],
+			(u32 *)&soft_uart->suart_fifo_addr
+				[uart_no].fifo_phys_addr_tx, count) != 0) {
+		dev_err(dev, "failed to tx data\n");
+	}
+
+	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+		uart_write_wakeup(&soft_uart->port[uart_no]);
+
+#if 0
+	if (uart_circ_empty(xmit))
+		__stop_tx(soft_uart, uart_no);
+#endif
+}
+
+static void suart_tx_task(unsigned long data)
+{
+	struct uart_port *port = (struct uart_port *)data;
+	struct omapl_pru_suart *soft_uart =
+		container_of(port, struct omapl_pru_suart, port[port->line]);
+
+	omapl_pru_tx_chars(soft_uart, port->line);
+}
+
+static void omapl_pru_rx_chars(struct omapl_pru_suart *soft_uart, u32 uart_no)
+{
+	struct tty_struct *tty = NULL;
+	struct device *dev = soft_uart->dev;
+	s8 flags = TTY_NORMAL;
+	u16 rx_status, data_len = SUART_FIFO_LEN;
+	u32 data_len_read;
+	u8 suart_data[SUART_FIFO_LEN + 1];
+	s32 i = 0;
+
+	if (!(suart_get_duplex(soft_uart, uart_no) & ePRU_SUART_HALF_RX))
+		return;
+
+	/* read the status */
+	rx_status = pru_softuart_get_rx_status(dev,
+			&soft_uart->suart_hdl[uart_no]);
+
+	pru_softuart_read_data(dev, &soft_uart->suart_hdl[uart_no],
+			suart_data, data_len + 1, &data_len_read);
+
+	tty = tty_port_tty_get(&soft_uart->port[uart_no].state->port);
+
+	if (!tty)
+		return;
+
+	/* check for errors */
+	if (rx_status & CHN_TXRX_STATUS_ERR) {
+		if (rx_status & CHN_TXRX_STATUS_FE)
+			soft_uart->port[uart_no].icount.frame++;
+		if (rx_status & CHN_TXRX_STATUS_OVRNERR)
+			soft_uart->port[uart_no].icount.overrun++;
+		if (rx_status & CHN_TXRX_STATUS_BI)
+			soft_uart->port[uart_no].icount.brk++;
+			rx_status &= soft_uart->port[uart_no].
+						read_status_mask;
+		if (rx_status & CHN_TXRX_STATUS_FE)
+			flags = TTY_FRAME;
+		if (rx_status & CHN_TXRX_STATUS_OVRNERR)
+			flags = TTY_OVERRUN;
+		if (rx_status & CHN_TXRX_STATUS_BI)
+			flags = TTY_BREAK;
+
+#ifdef SUPPORT_SYSRQ
+		soft_uart->port[uart_no].sysrq = 0;
+#endif
+	} else {
+		for (i = 0; i <= data_len_read; i++) {
+			soft_uart->port[uart_no].icount.rx++;
+			/* check for sys rq */
+			if (uart_handle_sysrq_char
+			    (&soft_uart->port[uart_no], suart_data))
+				continue;
+		}
+		tty_insert_flip_string(tty, suart_data, data_len_read);
+	}
+
+	/* push data into tty */
+	pru_softuart_clr_rx_status(dev, &soft_uart->suart_hdl[uart_no]);
+	tty_flip_buffer_push(tty);
+	tty_kref_put(tty);
+}
+
+static irqreturn_t pruss_suart_interrupt(s32 irq, void *dev_id)
+{
+	struct uart_port *port = dev_id;
+	struct omapl_pru_suart *soft_uart =
+		container_of(port, struct omapl_pru_suart, port[port->line]);
+	struct device *dev = soft_uart->dev;
+	u16 txrx_flag;
+	u32 ret;
+	unsigned long flags = 0;
+	u16 uart_num = port->line + 1;
+
+	spin_lock_irqsave(&port->lock, flags);
+
+	do {
+		ret = pru_softuart_get_isrstatus(dev, uart_num, &txrx_flag);
+		if (ret != 0) {
+			dev_err(dev, "suart%d: failed to get interrupt, ret:"
+				" 0x%X txrx_flag 0x%X\n",
+				port->line, ret, txrx_flag);
+				spin_unlock_irqrestore(&port->lock, flags);
+			return IRQ_NONE;
+		}
+		if ((PRU_RX_INTR & txrx_flag) == PRU_RX_INTR) {
+			pru_intr_clr_isrstatus(dev, uart_num, PRU_RX_INTR);
+			if ((soft_uart->port[port->line].ignore_status_mask &
+				CHN_TXRX_STATUS_RDY) == CHN_TXRX_STATUS_RDY) {
+				pru_softuart_clr_rx_status(dev,
+					&soft_uart->suart_hdl
+				[port->line]);
+			} else {
+				omapl_pru_rx_chars(soft_uart, port->line);
+			}
+		}
+
+		if ((PRU_TX_INTR & txrx_flag) == PRU_TX_INTR) {
+			pru_intr_clr_isrstatus(dev, uart_num, PRU_TX_INTR);
+			pru_softuart_clr_tx_status(dev, &soft_uart->suart_hdl
+						 [port->line]);
+			tasklet_schedule(&soft_uart->tx_task[port->line]);
+		}
+	} while (txrx_flag & (PRU_RX_INTR | PRU_TX_INTR));
+
+	spin_unlock_irqrestore(&port->lock, flags);
+	return IRQ_HANDLED;
+}
+
+static void pruss_suart_stop_rx(struct uart_port *port)
+{
+	struct omapl_pru_suart *soft_uart =
+	    container_of(port, struct omapl_pru_suart, port[port->line]);
+	struct device *dev = soft_uart->dev;
+	unsigned long flags = 0;
+
+	spin_lock_irqsave(&port->lock, flags);
+	/* disable rx interrupt */
+	suart_intr_clrmask(dev, soft_uart->suart_hdl[port->line].uart_num,
+			   PRU_RX_INTR, CHN_TXRX_IE_MASK_BI
+			   | CHN_TXRX_IE_MASK_FE | CHN_TXRX_IE_MASK_CMPLT
+			   | CHN_TXRX_IE_MASK_TIMEOUT);
+	spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void pruss_suart_enable_ms(struct uart_port *port)
+{
+	struct omapl_pru_suart *soft_uart =
+	    container_of(port, struct omapl_pru_suart, port[port->line]);
+	struct device *dev = soft_uart->dev;
+	dev_err(dev, "modem control timer not supported\n");
+}
+
+static void pruss_suart_start_tx(struct uart_port *port)
+{
+	struct omapl_pru_suart *soft_uart =
+	    container_of(port, struct omapl_pru_suart, port[port->line]);
+	struct device *dev = soft_uart->dev;
+	unsigned long flags = 0;
+
+	/* unmask the tx interrupts */
+	spin_lock_irqsave(&port->lock, flags);
+	suart_intr_setmask(dev, soft_uart->suart_hdl[port->line].uart_num,
+			   PRU_TX_INTR, CHN_TXRX_IE_MASK_CMPLT);
+	spin_unlock_irqrestore(&port->lock, flags);
+
+	if (test_and_clear_bit(0, &soft_uart->tx_empty[port->line]))
+		omapl_pru_tx_chars(soft_uart, port->line);
+}
+
+static u32 pruss_suart_tx_empty(struct uart_port *port)
+{
+	struct omapl_pru_suart *soft_uart =
+	    container_of(port, struct omapl_pru_suart, port[port->line]);
+	struct device *dev = soft_uart->dev;
+
+	return (pru_softuart_get_tx_status(dev,
+		&soft_uart->suart_hdl[port->line])
+		& CHN_TXRX_STATUS_RDY) ? 0 : TIOCSER_TEMT;
+}
+
+static u32 pruss_suart_get_mctrl(struct uart_port *port)
+{
+	return -ENOTSUPP;
+}
+
+static void pruss_suart_set_mctrl(struct uart_port *port, u32 mctrl)
+{
+	struct omapl_pru_suart *soft_uart =
+	    container_of(port, struct omapl_pru_suart, port[port->line]);
+	struct device *dev = soft_uart->dev;
+	dev_dbg(dev, "modem control not supported\n");
+}
+
+static void pruss_suart_break_ctl(struct uart_port *port, s32 break_state)
+{
+	struct omapl_pru_suart *soft_uart =
+	    container_of(port, struct omapl_pru_suart, port[port->line]);
+	struct device *dev = soft_uart->dev;
+	unsigned long flags = 0;
+
+	spin_lock_irqsave(&port->lock, flags);
+
+	if (break_state == -1)
+		suart_intr_clrmask(dev,
+			soft_uart->suart_hdl[port->line].uart_num,
+			PRU_RX_INTR, CHN_TXRX_IE_MASK_BI);
+	else
+		suart_intr_setmask(dev,
+			soft_uart->suart_hdl[port->line].uart_num,
+			PRU_RX_INTR, CHN_TXRX_IE_MASK_BI);
+
+	spin_unlock_irqrestore(&port->lock, flags);
+}
+
+static void pruss_suart_set_termios(struct uart_port *port,
+				  struct ktermios *termios,
+				  struct ktermios *old)
+{
+	struct omapl_pru_suart *soft_uart =
+	    container_of(port, struct omapl_pru_suart, port[port->line]);
+	struct device *dev = soft_uart->dev;
+	u8 cval = 0;
+	unsigned long flags = 0;
+	u32 baud = 0;
+	u32 old_csize = old ? old->c_cflag & CSIZE : CS8;
+
+/*
+ * Do not allow unsupported configurations to be set
+ */
+	if (1) {
+		termios->c_cflag &= ~(CRTSCTS | CMSPAR | CSTOPB
+				      | PARENB | PARODD | CMSPAR);
+	}
+
+	switch (termios->c_cflag & CSIZE) {
+	case CS6:
+		cval = ePRU_SUART_DATA_BITS6;
+		break;
+	case CS7:
+		cval = ePRU_SUART_DATA_BITS7;
+		break;
+	default:
+	case CS8:
+		cval = ePRU_SUART_DATA_BITS8;
+		break;
+	}
+	/*
+	 * We do not support CS5.
+	 */
+	if ((termios->c_cflag & CSIZE) == CS5) {
+		termios->c_cflag &= ~CSIZE;
+		termios->c_cflag |= old_csize;
+	}
+	if (pru_softuart_setdatabits
+		(dev, &soft_uart->suart_hdl[port->line], cval, cval) != 0)
+		dev_err(dev, "failed to set data bits to: %d\n", cval);
+
+/*
+ * Ask the core to calculate the divisor for us.
+ */
+	baud = uart_get_baud_rate(port, termios, old,
+			  port->uartclk / 16 / 0xffff,
+			  port->uartclk / 16);
+
+/*
+ * Ok, we're now changing the port state.  Do it with
+ * interrupts disabled.
+ */
+	spin_lock_irqsave(&port->lock, flags);
+
+	/* Set the baud */
+	if (pru_softuart_setbaud(dev, &soft_uart->suart_hdl[port->line],
+				 SUART_DEFAULT_BAUD / baud,
+				 SUART_DEFAULT_BAUD / baud) != 0)
+		dev_err(dev, "failed to set baud to: %d\n", baud);
+
+/*
+ * update port->read_config_mask and port->ignore_config_mask
+ * to indicate the events we are interested in receiving
+ */
+	suart_intr_setmask(dev, soft_uart->suart_hdl[port->line].uart_num,
+			   PRU_RX_INTR, SUART_GBL_INTR_ERR_MASK);
+	port->read_status_mask = 0;
+	if (termios->c_iflag & INPCK) {	/* Input parity check not supported,
+					just enabled FE */
+		port->read_status_mask |= CHN_TXRX_STATUS_FE;
+		suart_intr_setmask(dev,
+			soft_uart->suart_hdl[port->line].uart_num,
+			PRU_RX_INTR, CHN_TXRX_IE_MASK_FE);
+	}
+	if (termios->c_iflag & (BRKINT | PARMRK)) {
+		port->read_status_mask |= CHN_TXRX_STATUS_BI;
+		suart_intr_setmask(dev,
+			soft_uart->suart_hdl[port->line].uart_num,
+			PRU_RX_INTR, CHN_TXRX_IE_MASK_BI);
+	}
+/*
+ * Characters to ignore
+ */
+	port->ignore_status_mask = 0;
+	if (termios->c_iflag & IGNBRK) {
+		port->ignore_status_mask |= CHN_TXRX_STATUS_BI;
+		/*
+		 * If we're ignoring break indicators,
+		 * ignore overruns too (for real raw support).
+		 */
+		if (termios->c_iflag & IGNPAR) {
+			port->ignore_status_mask |=
+			    (CHN_TXRX_STATUS_OVRNERR | CHN_TXRX_STATUS_FE);
+			/*
+			 * Overrun in case of RX
+			 * Underrun in case of TX
+			 */
+			suart_intr_clrmask(dev, soft_uart->
+					   suart_hdl[port->line].uart_num,
+					   PRU_RX_INTR, CHN_TXRX_IE_MASK_FE);
+		}
+		suart_intr_clrmask(dev,
+			soft_uart->suart_hdl[port->line].uart_num,
+			PRU_RX_INTR, CHN_TXRX_IE_MASK_BI);
+	}
+/*
+ * ignore all characters if CREAD is not set
+ */
+	if ((termios->c_cflag & CREAD) == 0) {
+		port->ignore_status_mask |= CHN_TXRX_STATUS_RDY;
+		pruss_suart_stop_rx(port);
+	}
+	/*
+	* update the per port timeout
+	*/
+	uart_update_timeout(port, termios->c_cflag, baud);
+
+	spin_unlock_irqrestore(&port->lock, flags);
+
+	/* Don't rewrite B0 */
+	if (tty_termios_baud_rate(termios))
+		tty_termios_encode_baud_rate(termios, baud, baud);
+}
+
+/*
+ *	Grab any interrupt resources and initialise any low level driver
+ *	state.  Enable the port for reception.  It should not activate
+ *	RTS nor DTR; this will be done via a separate call to set_mctrl.
+ *
+ *	This method will only be called when the port is initially opened.
+ *
+ *	Locking: port_sem taken.
+ *	Interrupts: globally disabled.
+ */
+static s32 pruss_suart_startup(struct uart_port *port)
+{
+	struct omapl_pru_suart *soft_uart =
+	    container_of(port, struct omapl_pru_suart, port[port->line]);
+	struct device *dev = soft_uart->dev;
+	unsigned long flags = 0;
+	s32 retval;
+
+	/*
+	 * Disable interrupts from this port
+	 */
+	spin_lock_irqsave(&port->lock, flags);
+	suart_intr_clrmask(dev, soft_uart->suart_hdl[port->line].uart_num,
+			   PRU_TX_INTR, CHN_TXRX_IE_MASK_CMPLT);
+	suart_intr_clrmask(dev, soft_uart->suart_hdl[port->line].uart_num,
+			   PRU_RX_INTR, CHN_TXRX_IE_MASK_BI
+			   | CHN_TXRX_IE_MASK_FE | CHN_TXRX_IE_MASK_CMPLT
+			   | CHN_TXRX_IE_MASK_TIMEOUT);
+	spin_unlock_irqrestore(&port->lock, flags);
+
+	retval = request_irq(port->irq, pruss_suart_interrupt,
+			     port->irqflags, "suart_irq", port);
+	if (retval) {
+		free_irq(port->irq, port); /* should we free this if err */
+		goto out;
+	}
+	/*
+	 * enable interrupts from this port
+	 */
+	spin_lock_irqsave(&port->lock, flags);
+	suart_intr_setmask(dev, soft_uart->suart_hdl[port->line].uart_num,
+			   PRU_RX_INTR, SUART_GBL_INTR_ERR_MASK);
+
+	suart_intr_setmask(dev, soft_uart->suart_hdl[port->line].uart_num,
+			   PRU_RX_INTR, CHN_TXRX_IE_MASK_BI
+			   | CHN_TXRX_IE_MASK_FE | CHN_TXRX_IE_MASK_CMPLT
+			   | CHN_TXRX_IE_MASK_TIMEOUT);
+
+	suart_intr_setmask(dev, soft_uart->suart_hdl[port->line].uart_num,
+			   PRU_TX_INTR, CHN_TXRX_IE_MASK_CMPLT);
+	spin_unlock_irqrestore(&port->lock, flags);
+
+	if ((suart_get_duplex(soft_uart, port->line) & ePRU_SUART_HALF_TX)
+	    == ePRU_SUART_HALF_TX) {
+		suart_pru_to_host_intr_enable(dev, soft_uart->
+			suart_hdl[port->line].uart_num, PRU_TX_INTR, true);
+	}
+	/* Seed RX if port is half-rx or full-duplex */
+	if ((suart_get_duplex(soft_uart, port->line) & ePRU_SUART_HALF_RX)
+		== ePRU_SUART_HALF_RX) {
+		suart_pru_to_host_intr_enable(dev, soft_uart->
+			suart_hdl[port->line].uart_num, PRU_RX_INTR, true);
+		pru_softuart_read(dev, &soft_uart->suart_hdl[port->line],
+			(u32 *)&soft_uart->suart_fifo_addr[port->line].
+			fifo_phys_addr_rx, SUART_FIFO_LEN);
+	}
+out:
+	return retval;
+}
+
+/*
+ * Disable the port, disable any break condition that may be in
+ * effect, and free any interrupt resources.  It should not disable
+ * RTS nor DTR; this will have already been done via a separate
+ * call to set_mctrl.
+ *
+ * Drivers must not access port->info once this call has completed.
+ *
+ * This method will only be called when there are no more users of
+ * this port.
+ *
+ * Locking: port_sem taken.
+ * Interrupts: caller dependent.
+ */
+
+static void pruss_suart_shutdown(struct uart_port *port)
+{
+	struct omapl_pru_suart *soft_uart =
+	    container_of(port, struct omapl_pru_suart, port[port->line]);
+	struct device *dev = soft_uart->dev;
+	unsigned long flags = 0;
+
+	/*
+	 * Disable interrupts from this port
+	 */
+	/* Disable BI and FE intr */
+	spin_lock_irqsave(&port->lock, flags);
+	suart_intr_clrmask(dev, soft_uart->suart_hdl[port->line].uart_num,
+			   PRU_TX_INTR, CHN_TXRX_IE_MASK_CMPLT);
+	suart_intr_clrmask(dev, soft_uart->suart_hdl[port->line].uart_num,
+			   PRU_RX_INTR, CHN_TXRX_IE_MASK_BI
+			   | CHN_TXRX_IE_MASK_FE | CHN_TXRX_IE_MASK_CMPLT
+			   | CHN_TXRX_IE_MASK_TIMEOUT);
+	spin_unlock_irqrestore(&port->lock, flags);
+
+	/* free interrupts */
+	free_irq(port->irq, port);
+}
+
+/*
+ * Return a pointer to a string constant describing the specified
+ * port, or return NULL, in which case the string 'unknown' is
+ * substituted.
+ *
+ * Locking: none.
+ * Interrupts: caller dependent.
+ */
+
+static const char *pruss_suart_type(struct uart_port *port)
+{
+	return "suart_tty";
+}
+
+/*
+ * Release any memory and IO region resources currently in use by
+ * the port.
+ *
+ * Locking: none.
+ * Interrupts: caller dependent.
+ */
+
+static void pruss_suart_release_port(struct uart_port *port)
+{
+	struct omapl_pru_suart *soft_uart =
+	    container_of(port, struct omapl_pru_suart, port[port->line]);
+	struct platform_device *pdev = to_platform_device(port->dev);
+
+	if (0 != pru_softuart_close(&soft_uart->suart_hdl[port->line]))
+		dev_err(&pdev->dev, "failed to close suart\n");
+
+	return;
+}
+
+/*
+ * Request any memory and IO region resources required by the port.
+ * If any fail, no resources should be registered when this function
+ * returns, and it should return -EBUSY on failure.
+ *
+ * Locking: none.
+ * Interrupts: caller dependent.
+ *
+ * We need to d/l the f/w in probe and since this api
+ * is called per uart, the request_mem_region should
+ * be called in probe itself.
+ */
+static s32 pruss_suart_request_port(struct uart_port *port)
+{
+	struct omapl_pru_suart *soft_uart =
+	    container_of(port, struct omapl_pru_suart, port[port->line]);
+	struct platform_device *pdev = to_platform_device(port->dev);
+	struct device *dev = soft_uart->dev;
+	struct suart_config pru_suart_config;
+	s16 timeout = 0;
+	u32 err = 0;
+
+	if (soft_uart == NULL) {
+		dev_err(&pdev->dev, "soft_uart ptr failed\n");
+		return -ENODEV;
+	}
+	err = pru_softuart_open(&soft_uart->suart_hdl[port->line]);
+	if (err != 0) {
+		dev_err(&pdev->dev, "failed to open suart: %d\n", err);
+		err = -ENODEV;
+		goto exit;
+	}
+	set_bit(0, &soft_uart->tx_empty[port->line]);
+
+	/* set fifo /timeout */
+	if (SUART_FIFO_TIMEOUT_MIN > suart_timeout) {
+		dev_err(&pdev->dev, "fifo timeout less than %d ms not supported\n",
+			    SUART_FIFO_TIMEOUT_MIN);
+		suart_timeout = SUART_FIFO_TIMEOUT_MIN;
+	} else if (SUART_FIFO_TIMEOUT_MAX < suart_timeout) {
+		dev_err(&pdev->dev, "fifo timeout more than %d ms not supported\n",
+			    SUART_FIFO_TIMEOUT_MAX);
+		suart_timeout = SUART_FIFO_TIMEOUT_MAX;
+	}
+
+	/* This is only for x8 */
+	timeout = (SUART_DEFAULT_BAUD * suart_timeout) / 1000;
+	pru_set_fifo_timeout(dev, timeout);
+
+	if (soft_uart->suart_hdl[port->line].uart_num == PRU_SUART_UART1) {
+		pru_suart_config.tx_serializer = PRU_SUART0_CONFIG_TX_SER;
+		pru_suart_config.rx_serializer = PRU_SUART0_CONFIG_RX_SER;
+	} else if (soft_uart->suart_hdl[port->line].uart_num ==
+							PRU_SUART_UART2) {
+		pru_suart_config.tx_serializer = PRU_SUART1_CONFIG_TX_SER;
+		pru_suart_config.rx_serializer = PRU_SUART1_CONFIG_RX_SER;
+	} else if (soft_uart->suart_hdl[port->line].uart_num ==
+							PRU_SUART_UART3) {
+		pru_suart_config.tx_serializer = PRU_SUART2_CONFIG_TX_SER;
+		pru_suart_config.rx_serializer = PRU_SUART2_CONFIG_RX_SER;
+	} else if (soft_uart->suart_hdl[port->line].uart_num ==
+							PRU_SUART_UART4) {
+		pru_suart_config.tx_serializer = PRU_SUART3_CONFIG_TX_SER;
+		pru_suart_config.rx_serializer = PRU_SUART3_CONFIG_RX_SER;
+	} else if (soft_uart->suart_hdl[port->line].uart_num ==
+							PRU_SUART_UART5) {
+		pru_suart_config.tx_serializer = PRU_SUART4_CONFIG_TX_SER;
+		pru_suart_config.rx_serializer = PRU_SUART4_CONFIG_RX_SER;
+	} else if (soft_uart->suart_hdl[port->line].uart_num ==
+							PRU_SUART_UART6) {
+		pru_suart_config.tx_serializer = PRU_SUART5_CONFIG_TX_SER;
+		pru_suart_config.rx_serializer = PRU_SUART5_CONFIG_RX_SER;
+	} else if (soft_uart->suart_hdl[port->line].uart_num ==
+							PRU_SUART_UART7) {
+		pru_suart_config.tx_serializer = PRU_SUART6_CONFIG_TX_SER;
+		pru_suart_config.rx_serializer = PRU_SUART6_CONFIG_RX_SER;
+	} else if (soft_uart->suart_hdl[port->line].uart_num ==
+							PRU_SUART_UART8) {
+		pru_suart_config.tx_serializer = PRU_SUART7_CONFIG_TX_SER;
+		pru_suart_config.rx_serializer = PRU_SUART7_CONFIG_RX_SER;
+	} else {
+		return -ENOTSUPP;
+	}
+
+	/* Some defaults to startup. reconfigured by terimos later */
+	pru_suart_config.tx_clk_divisor = 1;
+	pru_suart_config.rx_clk_divisor = 1;
+	pru_suart_config.tx_bits_per_char = ePRU_SUART_DATA_BITS8;
+	pru_suart_config.rx_bits_per_char = ePRU_SUART_DATA_BITS8;
+	pru_suart_config.oversampling = SUART_DEFAULT_OVRSMPL;
+
+	if (pru_softuart_setconfig(dev, &soft_uart->suart_hdl[port->line],
+			&pru_suart_config) != 0) {
+		dev_err(&pdev->dev,
+			"pru_softuart_setconfig: failed to set config: %X\n",
+			err);
+	}
+exit:
+	return err;
+}
+
+/*
+ * Perform any autoconfiguration steps required for the port.  `flag`
+ * contains a bit mask of the required configuration.  UART_CONFIG_TYPE
+ * indicates that the port requires detection and identification.
+ * port->type should be set to the type found, or PORT_UNKNOWN if
+ * no port was detected.
+ *
+ * UART_CONFIG_IRQ indicates autoconfiguration of the interrupt signal,
+ * which should be probed using standard kernel autoprobing techniques.
+ * This is not necessary on platforms where ports have interrupts
+ * internally hard wired (eg, system on a chip implementations).
+ *
+ * Locking: none.
+ * Interrupts: caller dependent.
+ */
+
+static void pruss_suart_config_port(struct uart_port *port, s32 flags)
+{
+	if (flags & UART_CONFIG_TYPE && pruss_suart_request_port(port) == 0)
+		port->type = PORT_DA8XX_PRU_SUART;
+}
+
+/*
+ * Verify the new serial port information contained within serinfo is
+ * suitable for this port type.
+ *
+ * Locking: none.
+ * Interrupts: caller dependent.
+ */
+static s32 pruss_suart_verify_port(struct uart_port *port,
+				 struct serial_struct *ser)
+{
+	struct omapl_pru_suart *soft_uart =
+	    container_of(port, struct omapl_pru_suart, port[port->line]);
+	s32 ret = 0;
+
+	if (ser->type != PORT_UNKNOWN && ser->type != PORT_DA8XX_PRU_SUART)
+		ret = -EINVAL;
+	if (soft_uart->port[port->line].irq != ser->irq)
+		ret = -EINVAL;
+	if (ser->io_type != UPIO_MEM)
+		ret = -EINVAL;
+	if (soft_uart->port[port->line].uartclk / 16 != ser->baud_base)
+		ret = -EINVAL;
+	if ((void *)soft_uart->port[port->line].mapbase != ser->iomem_base)
+		ret = -EINVAL;
+	if (soft_uart->port[port->line].iobase != ser->port)
+		ret = -EINVAL;
+	return ret;
+}
+
+static struct uart_ops pruss_suart_ops = {
+	.tx_empty	= pruss_suart_tx_empty,
+	.set_mctrl	= pruss_suart_set_mctrl,
+	.get_mctrl	= pruss_suart_get_mctrl,
+	.stop_tx	= pruss_suart_stop_tx,
+	.start_tx	= pruss_suart_start_tx,
+	.stop_rx	= pruss_suart_stop_rx,
+	.enable_ms	= pruss_suart_enable_ms,
+	.break_ctl	= pruss_suart_break_ctl,
+	.startup	= pruss_suart_startup,
+	.shutdown	= pruss_suart_shutdown,
+	.set_termios	= pruss_suart_set_termios,
+	.type		= pruss_suart_type,
+	.release_port	= pruss_suart_release_port,
+	.request_port	= pruss_suart_request_port,
+	.config_port	= pruss_suart_config_port,
+	.verify_port	= pruss_suart_verify_port,
+};
+
+static struct uart_driver pruss_suart_reg = {
+	.owner		= THIS_MODULE,
+	.driver_name	= DRV_NAME,
+	.dev_name	= "ttySU",
+	.major		= 0,
+	.minor		= 16,
+	.nr		= NR_SUART,
+};
+
+static struct pruss_suart_initparams init_params = {
+	.tx_baud_value	= SUART_DEFAULT_BAUD,
+	.rx_baud_value	= SUART_DEFAULT_BAUD,
+	.oversampling	= SUART_DEFAULT_OVRSMPL,
+};
+
+static s32 __devinit pruss_suart_probe(struct platform_device *pdev)
+{
+	struct omapl_pru_suart *soft_uart;
+	const struct da850_evm_pruss_suart_data *pdata;
+	struct device *dev = &pdev->dev;
+	struct resource *res;
+	struct clk *clk_pruss = NULL;
+	const struct firmware *fw;
+	s32 err, i;
+
+	pdata = dev->platform_data;
+	if (!pdata) {
+		dev_err(&pdev->dev, "platform data not found\n");
+		return -EINVAL;
+	}
+	(pdata->setup)();
+
+	soft_uart = kzalloc(sizeof(struct omapl_pru_suart), GFP_KERNEL);
+	if (!soft_uart)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "failed to get resource");
+		return -ENOMEM;
+	}
+
+	if (!request_mem_region(res->start,
+			resource_size(res),
+			dev_name(&pdev->dev))) {
+		dev_err(&pdev->dev, "mcasp memory region already claimed!\n");
+		err = -EBUSY;
+		goto probe_exit;
+	}
+
+	soft_uart->suart_iomap.mcasp_io_addr = ioremap(res->start,
+					resource_size(res));
+	if (!soft_uart->suart_iomap.mcasp_io_addr) {
+		dev_err(&pdev->dev, "mcasp ioremap failed\n");
+		err = -EFAULT;
+		goto probe_exit_1;
+	}
+
+	soft_uart->suart_iomap.p_fifo_buff_virt_base =
+	sram_alloc(SUART_CNTX_SZ * NR_SUART * 2,
+	(dma_addr_t *) &soft_uart->suart_iomap.p_fifo_buff_phys_base);
+	if (!soft_uart->suart_iomap.p_fifo_buff_virt_base)
+		goto probe_exit_iounmap;
+
+	clk_pruss = clk_get(NULL, "pruss");
+	if (IS_ERR(clk_pruss)) {
+		dev_err(&pdev->dev, "no clock available: pruss\n");
+		err = -ENODEV;
+		goto probe_exit_iounmap;
+	}
+	soft_uart->clk_freq_pru = clk_get_rate(clk_pruss);
+	clk_put(clk_pruss);
+
+	soft_uart->clk_mcasp = clk_get(&pdev->dev, NULL);
+	if (IS_ERR(soft_uart->clk_mcasp)) {
+		dev_err(&pdev->dev, "no clock available: mcasp\n");
+		err = -ENODEV;
+		soft_uart->clk_mcasp = NULL;
+		goto probe_exit_sram_free;
+	}
+
+	soft_uart->clk_freq_mcasp = clk_get_rate(soft_uart->clk_mcasp);
+	clk_enable(soft_uart->clk_mcasp);
+
+	err = request_firmware(&fw, "PRU_SUART_Emulation.bin",
+			       &pdev->dev);
+	if (err) {
+		dev_err(&pdev->dev, "can't load firmware\n");
+		err = -ENODEV;
+		goto probe_exit_clk;
+	}
+	dev_info(&pdev->dev, "fw size %td. downloading...\n", fw->size);
+
+	/* download firmware into pru  & init */
+	err = pru_softuart_init(dev, &init_params, fw->data, fw->size,
+					soft_uart->clk_freq_pru / 1000000,
+					&soft_uart->suart_iomap);
+	if (err) {
+		dev_err(&pdev->dev, "pruss init error\n");
+		err = -ENODEV;
+		goto probe_release_fw;
+	}
+	release_firmware(fw);
+
+	platform_set_drvdata(pdev, &soft_uart->port[0]);
+	soft_uart->dev = dev;
+
+	for (i = 0; i < NR_SUART; i++) {
+		soft_uart->port[i].ops = &pruss_suart_ops;
+		soft_uart->port[i].iotype = UPIO_MEM;
+		soft_uart->port[i].flags = UPF_BOOT_AUTOCONF | UPF_IOREMAP;
+		soft_uart->port[i].mapbase =
+			(u32)soft_uart->suart_iomap.p_fifo_buff_virt_base;
+		soft_uart->port[i].membase =
+			soft_uart->suart_iomap.mcasp_io_addr;
+		soft_uart->port[i].type = PORT_DA8XX_PRU_SUART;
+		soft_uart->port[i].irq =
+			platform_get_irq(to_platform_device(dev->parent), i);
+		soft_uart->port[i].dev = &pdev->dev;
+		soft_uart->port[i].irqflags = IRQF_SHARED;
+		soft_uart->port[i].uartclk = soft_uart->clk_freq_mcasp;
+		soft_uart->port[i].fifosize = SUART_FIFO_LEN;
+		soft_uart->tx_loadsz = SUART_FIFO_LEN;
+		soft_uart->port[i].custom_divisor = 1;
+		soft_uart->port[i].line = i;
+		soft_uart->suart_hdl[i].uart_num = i + 1;
+		soft_uart->port[i].serial_in = NULL;
+
+		soft_uart->suart_fifo_addr[i].fifo_vaddr_buff_tx =
+		soft_uart->suart_iomap.p_fifo_buff_virt_base +
+		(2 * SUART_CNTX_SZ * i);
+
+		soft_uart->suart_fifo_addr[i].fifo_vaddr_buff_rx =
+		soft_uart->suart_iomap.p_fifo_buff_virt_base +
+		((2 * SUART_CNTX_SZ * i) + SUART_CNTX_SZ);
+
+		soft_uart->suart_fifo_addr[i].fifo_phys_addr_tx =
+		soft_uart->suart_iomap.p_fifo_buff_phys_base +
+		(2 * SUART_CNTX_SZ * i);
+
+		soft_uart->suart_fifo_addr[i].fifo_phys_addr_rx =
+		soft_uart->suart_iomap.p_fifo_buff_phys_base +
+		((2 * SUART_CNTX_SZ * i) + SUART_CNTX_SZ);
+
+		soft_uart->port[i].serial_out = NULL;
+		tasklet_init(&soft_uart->tx_task[i], suart_tx_task,
+				(unsigned long)&soft_uart->port[i]);
+		uart_add_one_port(&pruss_suart_reg, &soft_uart->port[i]);
+	}
+
+	dev_info(&pdev->dev,
+		"%s device registered (pru_clk=%d, asp_clk=%d)\n",
+		DRV_NAME, soft_uart->clk_freq_pru, soft_uart->clk_freq_mcasp);
+
+	return 0;
+
+probe_release_fw:
+	release_firmware(fw);
+probe_exit_clk:
+	clk_put(soft_uart->clk_mcasp);
+	clk_disable(soft_uart->clk_mcasp);
+probe_exit_sram_free:
+	sram_free(soft_uart->suart_iomap.p_fifo_buff_virt_base,
+	SUART_CNTX_SZ * NR_SUART * 2);
+probe_exit_iounmap:
+	iounmap(soft_uart->suart_iomap.mcasp_io_addr);
+probe_exit_1:
+	release_mem_region(res->start,
+		resource_size(res));
+probe_exit:
+	kfree(soft_uart);
+	return err;
+}
+
+static s32 __devexit pruss_suart_remove(struct platform_device *pdev)
+{
+	struct omapl_pru_suart *soft_uart = platform_get_drvdata(pdev);
+	const struct da850_evm_pruss_suart_data *pdata;
+	struct device *dev = &pdev->dev;
+	struct resource *res;
+	int i;
+
+	pdata = dev->platform_data;
+	if (!pdata)
+		dev_err(&pdev->dev, "platform data not found\n");
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res) {
+		dev_err(&pdev->dev, "failed to get resource");
+		return -ENOMEM;
+	}
+
+	platform_set_drvdata(pdev, NULL);
+
+	if (soft_uart) {
+		for (i = 0; i < NR_SUART; i++) {
+			uart_remove_one_port(&pruss_suart_reg,
+			&soft_uart->port[i]);
+		}
+	}
+
+	sram_free(soft_uart->suart_iomap.p_fifo_buff_virt_base,
+		SUART_CNTX_SZ * NR_SUART * 2);
+	clk_put(soft_uart->clk_mcasp);
+	pru_mcasp_deinit();
+	clk_disable(soft_uart->clk_mcasp);
+	iounmap(soft_uart->suart_iomap.mcasp_io_addr);
+	if (pdata) {
+		release_mem_region(res->start,
+			resource_size(res));
+	}
+	kfree(soft_uart);
+	return 0;
+}
+
+#define pruss_suart_suspend NULL
+#define pruss_suart_resume NULL
+
+static struct platform_driver serial_pruss_driver = {
+	.probe		= pruss_suart_probe,
+	.remove		= __devexit_p(pruss_suart_remove),
+	.suspend	= pruss_suart_suspend,
+	.resume		= pruss_suart_resume,
+	.driver		= {
+			.name	= DRV_NAME,
+			.owner	= THIS_MODULE,
+	},
+};
+
+static s32 __init pruss_suart_init(void)
+{
+	s32 ret;
+
+	pruss_suart_reg.nr = NR_SUART;
+	ret = uart_register_driver(&pruss_suart_reg);
+	if (ret)
+		return ret;
+	ret = platform_driver_register(&serial_pruss_driver);
+	if (ret)
+		goto out;
+
+	pr_debug("SUART serial driver loaded\n");
+	return ret;
+out:
+	uart_unregister_driver(&pruss_suart_reg);
+	return ret;
+}
+
+module_init(pruss_suart_init);
+
+static void __exit pruss_suart_exit(void)
+{
+	platform_driver_unregister(&serial_pruss_driver);
+	uart_unregister_driver(&pruss_suart_reg);
+	pr_debug("SUART serial driver unloaded\n");
+}
+
+module_exit(pruss_suart_exit);
+
+/* Module information */
+MODULE_AUTHOR("Subhasish Ghosh <subhasish@mistralsolutions.com>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION(DRV_DESC);
diff --git a/drivers/tty/serial/pruss_suart.h b/drivers/tty/serial/pruss_suart.h
new file mode 100644
index 0000000..f3a2a9d
--- /dev/null
+++ b/drivers/tty/serial/pruss_suart.h
@@ -0,0 +1,1038 @@
+/*
+ * Copyright (C) 2010, 2011 Texas Instruments Incorporated
+ * Author: Jitendra Kumar <jitendra@mistralsolutions.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as  published by the
+ * Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
+ * whether express or implied; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+
+#ifndef _SUART_API_H_
+#define _SUART_API_H_
+
+#include <linux/types.h>
+#include <linux/bitops.h>
+#include <linux/io.h>
+#include <linux/mfd/pruss.h>
+
+#define SINGLE_PRU			0
+#define BOTH_PRU			1
+#define PRU_ACTIVE			BOTH_PRU
+#define PRU_CLK_228			228
+#define PRU_CLK_186			186
+
+#define PRU_SUART_SERIALIZER_0		(0u)
+#define PRU_SUART_SERIALIZER_1		(1u)
+#define PRU_SUART_SERIALIZER_2		(2u)
+#define PRU_SUART_SERIALIZER_3		(3u)
+#define PRU_SUART_SERIALIZER_4		(4u)
+#define PRU_SUART_SERIALIZER_5		(5u)
+#define PRU_SUART_SERIALIZER_6		(6u)
+#define PRU_SUART_SERIALIZER_7		(7u)
+#define PRU_SUART_SERIALIZER_8		(8u)
+#define PRU_SUART_SERIALIZER_9		(9u)
+#define PRU_SUART_SERIALIZER_10		(10u)
+#define PRU_SUART_SERIALIZER_11		(11u)
+#define PRU_SUART_SERIALIZER_12		(12u)
+#define PRU_SUART_SERIALIZER_13		(13u)
+#define PRU_SUART_SERIALIZER_14		(14u)
+#define PRU_SUART_SERIALIZER_15		(15u)
+#define PRU_SUART_SERIALIZER_NONE	(16u)
+
+#define	PRU_SUART_UART1			(1u)
+#define	PRU_SUART_UART2			(2u)
+#define	PRU_SUART_UART3			(3u)
+#define	PRU_SUART_UART4			(4u)
+#define	PRU_SUART_UART5			(5u)
+#define	PRU_SUART_UART6			(6u)
+#define	PRU_SUART_UART7			(7u)
+#define PRU_SUART_UART8			(8u)
+#define PRU_SUART_UARTx_INVALID		(9u)
+
+#define PRU_SUART_HALF_TX		(1u)
+#define PRU_SUART_HALF_RX		(2u)
+#define PRU_SUART_HALF_TX_DISABLED	(4u)
+#define PRU_SUART_HALF_RX_DISABLED	(8u)
+
+#define PRU_SUART0_CONFIG_DUPLEX	(PRU_SUART_HALF_TX_DISABLED | \
+					PRU_SUART_HALF_RX_DISABLED)
+#define PRU_SUART0_CONFIG_RX_SER	(PRU_SUART_SERIALIZER_NONE)
+#define PRU_SUART0_CONFIG_TX_SER	(PRU_SUART_SERIALIZER_NONE)
+
+#define PRU_SUART1_CONFIG_DUPLEX	(PRU_SUART_HALF_TX | \
+					PRU_SUART_HALF_RX)
+#define PRU_SUART1_CONFIG_RX_SER	(PRU_SUART_SERIALIZER_7)
+#define PRU_SUART1_CONFIG_TX_SER	(PRU_SUART_SERIALIZER_8)
+
+#define PRU_SUART2_CONFIG_DUPLEX	(PRU_SUART_HALF_TX | \
+					PRU_SUART_HALF_RX)
+#define PRU_SUART2_CONFIG_RX_SER	(PRU_SUART_SERIALIZER_9)
+#define PRU_SUART2_CONFIG_TX_SER	(PRU_SUART_SERIALIZER_10)
+
+#define PRU_SUART3_CONFIG_DUPLEX	(PRU_SUART_HALF_TX | \
+					PRU_SUART_HALF_RX)
+#define PRU_SUART3_CONFIG_RX_SER	(PRU_SUART_SERIALIZER_13)
+#define PRU_SUART3_CONFIG_TX_SER	(PRU_SUART_SERIALIZER_14)
+
+#define PRU_SUART4_CONFIG_DUPLEX	(PRU_SUART_HALF_TX_DISABLED | \
+					PRU_SUART_HALF_RX_DISABLED)
+#define PRU_SUART4_CONFIG_RX_SER	(PRU_SUART_SERIALIZER_NONE)
+#define PRU_SUART4_CONFIG_TX_SER	(PRU_SUART_SERIALIZER_NONE)
+
+#define PRU_SUART5_CONFIG_DUPLEX	(PRU_SUART_HALF_TX_DISABLED | \
+					PRU_SUART_HALF_RX_DISABLED)
+#define PRU_SUART5_CONFIG_RX_SER	(PRU_SUART_SERIALIZER_NONE)
+#define PRU_SUART5_CONFIG_TX_SER	(PRU_SUART_SERIALIZER_NONE)
+
+#define PRU_SUART6_CONFIG_DUPLEX	(PRU_SUART_HALF_TX_DISABLED | \
+					PRU_SUART_HALF_RX_DISABLED)
+#define PRU_SUART6_CONFIG_RX_SER	(PRU_SUART_SERIALIZER_NONE)
+#define PRU_SUART6_CONFIG_TX_SER	(PRU_SUART_SERIALIZER_NONE)
+
+#define PRU_SUART7_CONFIG_DUPLEX	(PRU_SUART_HALF_TX_DISABLED | \
+					PRU_SUART_HALF_RX_DISABLED)
+#define PRU_SUART7_CONFIG_RX_SER	(PRU_SUART_SERIALIZER_NONE)
+#define PRU_SUART7_CONFIG_TX_SER	(PRU_SUART_SERIALIZER_NONE)
+
+#define SUART_NUM_OF_CHANNELS_PER_SUART		2
+#define SUART_NUM_OF_BYTES_PER_CHANNEL		16
+
+#define PRU_TX_INTR				1
+#define PRU_RX_INTR				2
+
+#define CHN_TXRX_STATUS_TIMEOUT			BIT(6)
+#define CHN_TXRX_STATUS_BI			BIT(5)
+#define CHN_TXRX_STATUS_FE			BIT(4)
+#define CHN_TXRX_STATUS_UNERR			BIT(3)
+#define CHN_TXRX_STATUS_OVRNERR			BIT(3)
+#define CHN_TXRX_STATUS_ERR			BIT(2)
+#define CHN_TXRX_STATUS_CMPLT			BIT(1)
+#define CHN_TXRX_STATUS_RDY			BIT(0)
+
+#define CHN_TXRX_IE_MASK_TIMEOUT		BIT(14)
+#define CHN_TXRX_IE_MASK_BI			BIT(13)
+#define CHN_TXRX_IE_MASK_FE			BIT(12)
+#define CHN_TXRX_IE_MASK_CMPLT			BIT(1)
+
+#define SUART_GBL_INTR_ERR_MASK			BIT(9)
+#define SUART_PRU_ID_MASK			0xFF
+
+#define SUART_FIFO_LEN				15
+#define SUART_8X_OVRSMPL			1
+#define SUART_16X_OVRSMPL			2
+#define SUART_TX_OVRSMPL			0
+#define SUART_DEFAULT_OVRSMPL			SUART_8X_OVRSMPL
+
+#define SUART_DEFAULT_OVRSMPL_OFFSET		26
+#define SUART_CHN_OFFSET			31
+#define SERIALIZER_OFFSET			8
+
+#if (SUART_DEFAULT_OVRSMPL == SUART_16X_OVRSMPL)
+#define SUART_DEFAULT_BAUD			57600
+#else
+#define SUART_DEFAULT_BAUD			115200
+#endif
+
+#define PRU_MODE_INVALID			0x0
+#define PRU_MODE_TX_ONLY			0x1
+#define PRU_MODE_RX_ONLY			0x2
+#define PRU_MODE_RX_TX_BOTH			0x3
+
+#if (PRU_ACTIVE == BOTH_PRU)
+#define PRU0_MODE				PRU_MODE_RX_ONLY
+#define PRU1_MODE				PRU_MODE_TX_ONLY
+#elif (PRU_ACTIVE ==  SINGLE_PRU)
+#define PRU0_MODE				PRU_MODE_RX_TX_BOTH
+#define PRU1_MODE				PRU_MODE_INVALID
+#else
+#define PRU0_MODE				PRU_MODE_INVALID
+#define PRU1_MODE				PRU_MODE_INVALID
+#endif
+
+#define MCASP_XBUF_BASE_ADDR			(0x01d00200)
+#define MCASP_RBUF_BASE_ADDR			(0x01d00280)
+#define MCASP_SRCTL_BASE_ADDR			(0x01d00180)
+
+#define MCASP_SRCTL_TX_MODE			(0x000D)
+#define MCASP_SRCTL_RX_MODE			(0x000E)
+
+/* Since only PRU0 can work as RX */
+#define RX_DEFAULT_DATA_DUMP_ADDR		(0x00001FC)
+#define PRU_NUM_OF_CHANNELS			(16)
+
+/* MCASP */
+
+#define OMAPL_MCASP_PFUNC_AFSR_MASK			(0x80000000u)
+#define OMAPL_MCASP_PFUNC_AFSR_SHIFT			(0x0000001Fu)
+#define OMAPL_MCASP_PFUNC_AFSR_RESETVAL			(0x00000000u)
+/* AFSR Tokens */
+#define OMAPL_MCASP_PFUNC_AFSR_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AFSR_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AHCLKR_MASK			(0x40000000u)
+#define OMAPL_MCASP_PFUNC_AHCLKR_SHIFT			(0x0000001Eu)
+#define OMAPL_MCASP_PFUNC_AHCLKR_RESETVAL		(0x00000000u)
+/* AHCLKR Tokens */
+#define OMAPL_MCASP_PFUNC_AHCLKR_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AHCLKR_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_ACLKR_MASK			(0x20000000u)
+#define OMAPL_MCASP_PFUNC_ACLKR_SHIFT			(0x0000001Du)
+#define OMAPL_MCASP_PFUNC_ACLKR_RESETVAL		(0x00000000u)
+/* ACLKR Tokens */
+#define OMAPL_MCASP_PFUNC_ACLKR_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_ACLKR_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AFSX_MASK			(0x10000000u)
+#define OMAPL_MCASP_PFUNC_AFSX_SHIFT			(0x0000001Cu)
+#define OMAPL_MCASP_PFUNC_AFSX_RESETVAL			(0x00000000u)
+/* AFSX Tokens */
+#define OMAPL_MCASP_PFUNC_AFSX_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AFSX_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AHCLKX_MASK			(0x08000000u)
+#define OMAPL_MCASP_PFUNC_AHCLKX_SHIFT			(0x0000001Bu)
+#define OMAPL_MCASP_PFUNC_AHCLKX_RESETVAL		(0x00000000u)
+/* AHCLKX Tokens */
+#define OMAPL_MCASP_PFUNC_AHCLKX_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AHCLKX_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_ACLKX_MASK			(0x04000000u)
+#define OMAPL_MCASP_PFUNC_ACLKX_SHIFT			(0x0000001Au)
+#define OMAPL_MCASP_PFUNC_ACLKX_RESETVAL		(0x00000000u)
+/* ACLKX Tokens */
+#define OMAPL_MCASP_PFUNC_ACLKX_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_ACLKX_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AMUTE_MASK			(0x02000000u)
+#define OMAPL_MCASP_PFUNC_AMUTE_SHIFT			(0x00000019u)
+#define OMAPL_MCASP_PFUNC_AMUTE_RESETVAL		(0x00000000u)
+/* AMUTE Tokens */
+#define OMAPL_MCASP_PFUNC_AMUTE_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AMUTE_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AXR15_MASK			(0x00008000u)
+#define OMAPL_MCASP_PFUNC_AXR15_SHIFT			(0x0000000Fu)
+#define OMAPL_MCASP_PFUNC_AXR15_RESETVAL		(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR15_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR15_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AXR14_MASK			(0x00004000u)
+#define OMAPL_MCASP_PFUNC_AXR14_SHIFT			(0x0000000Eu)
+#define OMAPL_MCASP_PFUNC_AXR14_RESETVAL		(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR14_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR14_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AXR13_MASK			(0x00002000u)
+#define OMAPL_MCASP_PFUNC_AXR13_SHIFT			(0x0000000Du)
+#define OMAPL_MCASP_PFUNC_AXR13_RESETVAL		(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR13_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR13_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AXR12_MASK			(0x00001000u)
+#define OMAPL_MCASP_PFUNC_AXR12_SHIFT			(0x0000000Cu)
+#define OMAPL_MCASP_PFUNC_AXR12_RESETVAL		(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR12_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR12_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AXR11_MASK			(0x00000800u)
+#define OMAPL_MCASP_PFUNC_AXR11_SHIFT			(0x0000000Bu)
+#define OMAPL_MCASP_PFUNC_AXR11_RESETVAL		(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR11_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR11_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AXR10_MASK			(0x00000400u)
+#define OMAPL_MCASP_PFUNC_AXR10_SHIFT			(0x0000000Au)
+#define OMAPL_MCASP_PFUNC_AXR10_RESETVAL		(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR10_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR10_GPIO			(0x00000001u)
+#define OMAPL_MCASP_PFUNC_AXR9_MASK			(0x00000200u)
+#define OMAPL_MCASP_PFUNC_AXR9_SHIFT			(0x00000009u)
+#define OMAPL_MCASP_PFUNC_AXR9_RESETVAL			(0x00000000u)
+/* AXR9 Token */
+#define OMAPL_MCASP_PFUNC_AXR9_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR9_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AXR8_MASK			(0x00000100u)
+#define OMAPL_MCASP_PFUNC_AXR8_SHIFT			(0x00000008u)
+#define OMAPL_MCASP_PFUNC_AXR8_RESETVAL			(0x00000000u)
+/* AXR8 Tokens */
+#define OMAPL_MCASP_PFUNC_AXR8_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR8_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AXR7_MASK			(0x00000080u)
+#define OMAPL_MCASP_PFUNC_AXR7_SHIFT			(0x00000007u)
+#define OMAPL_MCASP_PFUNC_AXR7_RESETVAL			(0x00000000u)
+/* AXR7 Tokens */
+#define OMAPL_MCASP_PFUNC_AXR7_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR7_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AXR6_MASK			(0x00000040u)
+#define OMAPL_MCASP_PFUNC_AXR6_SHIFT			(0x00000006u)
+#define OMAPL_MCASP_PFUNC_AXR6_RESETVAL			(0x00000000u)
+/* AXR6 Tokens */
+#define OMAPL_MCASP_PFUNC_AXR6_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR6_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AXR5_MASK			(0x00000020u)
+#define OMAPL_MCASP_PFUNC_AXR5_SHIFT			(0x00000005u)
+#define OMAPL_MCASP_PFUNC_AXR5_RESETVAL			(0x00000000u)
+/* AXR5 Tokens */
+#define OMAPL_MCASP_PFUNC_AXR5_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR5_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AXR4_MASK			(0x00000010u)
+#define OMAPL_MCASP_PFUNC_AXR4_SHIFT			(0x00000004u)
+#define OMAPL_MCASP_PFUNC_AXR4_RESETVAL			(0x00000000u)
+/* AXR4 Tokens */
+#define OMAPL_MCASP_PFUNC_AXR4_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR4_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AXR3_MASK			(0x00000008u)
+#define OMAPL_MCASP_PFUNC_AXR3_SHIFT			(0x00000003u)
+#define OMAPL_MCASP_PFUNC_AXR3_RESETVAL			(0x00000000u)
+/* AXR3 Tokens */
+#define OMAPL_MCASP_PFUNC_AXR3_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR3_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AXR2_MASK			(0x00000004u)
+#define OMAPL_MCASP_PFUNC_AXR2_SHIFT			(0x00000002u)
+#define OMAPL_MCASP_PFUNC_AXR2_RESETVAL			(0x00000000u)
+/* AXR2 Tokens */
+#define OMAPL_MCASP_PFUNC_AXR2_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR2_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AXR1_MASK			(0x00000002u)
+#define OMAPL_MCASP_PFUNC_AXR1_SHIFT			(0x00000001u)
+#define OMAPL_MCASP_PFUNC_AXR1_RESETVAL			(0x00000000u)
+/* AXR1 Tokens */
+#define OMAPL_MCASP_PFUNC_AXR1_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR1_GPIO			(0x00000001u)
+
+#define OMAPL_MCASP_PFUNC_AXR0_MASK			(0x00000001u)
+#define OMAPL_MCASP_PFUNC_AXR0_SHIFT			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR0_RESETVAL			(0x00000000u)
+/* AXR0 Tokens */
+#define OMAPL_MCASP_PFUNC_AXR0_MCASP			(0x00000000u)
+#define OMAPL_MCASP_PFUNC_AXR0_GPIO			(0x00000001u)
+#define OMAPL_MCASP_PFUNC_RESETVAL			(0x00000000u)
+
+#define OMAPL_MCASP_PDIR_AFSR_MASK			(0x80000000u)
+#define OMAPL_MCASP_PDIR_AFSR_SHIFT			(0x0000001Fu)
+#define OMAPL_MCASP_PDIR_AFSR_RESETVAL			(0x00000000u)
+/* AFSR Tokens */
+#define OMAPL_MCASP_PDIR_AFSR_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AFSR_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AHCLKR_MASK			(0x40000000u)
+#define OMAPL_MCASP_PDIR_AHCLKR_SHIFT			(0x0000001Eu)
+#define OMAPL_MCASP_PDIR_AHCLKR_RESETVAL		(0x00000000u)
+/* AHCLKR Tokens */
+#define OMAPL_MCASP_PDIR_AHCLKR_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AHCLKR_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_ACLKR_MASK			(0x20000000u)
+#define OMAPL_MCASP_PDIR_ACLKR_SHIFT			(0x0000001Du)
+#define OMAPL_MCASP_PDIR_ACLKR_RESETVAL			(0x00000000u)
+/* ACLKR Tokens */
+#define OMAPL_MCASP_PDIR_ACLKR_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_ACLKR_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AFSX_MASK			(0x10000000u)
+#define OMAPL_MCASP_PDIR_AFSX_SHIFT			(0x0000001Cu)
+#define OMAPL_MCASP_PDIR_AFSX_RESETVAL			(0x00000000u)
+/* AFSX Tokens */
+#define OMAPL_MCASP_PDIR_AFSX_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AFSX_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AHCLKX_MASK			(0x08000000u)
+#define OMAPL_MCASP_PDIR_AHCLKX_SHIFT			(0x0000001Bu)
+#define OMAPL_MCASP_PDIR_AHCLKX_RESETVAL		(0x00000000u)
+/* AHCLKX Tokens */
+#define OMAPL_MCASP_PDIR_AHCLKX_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AHCLKX_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_ACLKX_MASK			(0x04000000u)
+#define OMAPL_MCASP_PDIR_ACLKX_SHIFT			(0x0000001Au)
+#define OMAPL_MCASP_PDIR_ACLKX_RESETVAL			(0x00000000u)
+/* ACLKX Tokens */
+#define OMAPL_MCASP_PDIR_ACLKX_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_ACLKX_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AMUTE_MASK			(0x02000000u)
+#define OMAPL_MCASP_PDIR_AMUTE_SHIFT			(0x00000019u)
+#define OMAPL_MCASP_PDIR_AMUTE_RESETVAL			(0x00000000u)
+/* AMUTE Tokens */
+#define OMAPL_MCASP_PDIR_AMUTE_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AMUTE_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AXR15_MASK			(0x00008000u)
+#define OMAPL_MCASP_PDIR_AXR15_SHIFT			(0x0000000Fu)
+#define OMAPL_MCASP_PDIR_AXR15_RESETVAL			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR15_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR15_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AXR14_MASK			(0x00004000u)
+#define OMAPL_MCASP_PDIR_AXR14_SHIFT			(0x0000000Eu)
+#define OMAPL_MCASP_PDIR_AXR14_RESETVAL			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR14_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR14_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AXR13_MASK			(0x00002000u)
+#define OMAPL_MCASP_PDIR_AXR13_SHIFT			(0x0000000Du)
+#define OMAPL_MCASP_PDIR_AXR13_RESETVAL			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR13_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR13_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AXR12_MASK			(0x00001000u)
+#define OMAPL_MCASP_PDIR_AXR12_SHIFT			(0x0000000Cu)
+#define OMAPL_MCASP_PDIR_AXR12_RESETVAL			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR12_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR12_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AXR11_MASK			(0x00000800u)
+#define OMAPL_MCASP_PDIR_AXR11_SHIFT			(0x0000000Bu)
+#define OMAPL_MCASP_PDIR_AXR11_RESETVAL			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR11_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR11_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AXR10_MASK			(0x00000400u)
+#define OMAPL_MCASP_PDIR_AXR10_SHIFT			(0x0000000Au)
+#define OMAPL_MCASP_PDIR_AXR10_RESETVAL			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR10_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR10_OUTPUT			(0x00000001u)
+#define OMAPL_MCASP_PDIR_AXR9_MASK			(0x00000200u)
+#define OMAPL_MCASP_PDIR_AXR9_SHIFT			(0x00000009u)
+#define OMAPL_MCASP_PDIR_AXR9_RESETVAL			(0x00000000u)
+/* AXR9 Tokens */
+#define OMAPL_MCASP_PDIR_AXR9_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR9_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AXR8_MASK			(0x00000100u)
+#define OMAPL_MCASP_PDIR_AXR8_SHIFT			(0x00000008u)
+#define OMAPL_MCASP_PDIR_AXR8_RESETVAL			(0x00000000u)
+/* AXR8 Tokens */
+#define OMAPL_MCASP_PDIR_AXR8_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR8_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AXR7_MASK			(0x00000080u)
+#define OMAPL_MCASP_PDIR_AXR7_SHIFT			(0x00000007u)
+#define OMAPL_MCASP_PDIR_AXR7_RESETVAL			(0x00000000u)
+/*----AXR7 Tokens----*/
+#define OMAPL_MCASP_PDIR_AXR7_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR7_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AXR6_MASK			(0x00000040u)
+#define OMAPL_MCASP_PDIR_AXR6_SHIFT			(0x00000006u)
+#define OMAPL_MCASP_PDIR_AXR6_RESETVAL			(0x00000000u)
+/*----AXR6 Tokens----*/
+#define OMAPL_MCASP_PDIR_AXR6_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR6_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AXR5_MASK			(0x00000020u)
+#define OMAPL_MCASP_PDIR_AXR5_SHIFT			(0x00000005u)
+#define OMAPL_MCASP_PDIR_AXR5_RESETVAL			(0x00000000u)
+/*----AXR5 Tokens----*/
+#define OMAPL_MCASP_PDIR_AXR5_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR5_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AXR4_MASK			(0x00000010u)
+#define OMAPL_MCASP_PDIR_AXR4_SHIFT			(0x00000004u)
+#define OMAPL_MCASP_PDIR_AXR4_RESETVAL			(0x00000000u)
+/*----AXR4 Tokens----*/
+#define OMAPL_MCASP_PDIR_AXR4_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR4_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AXR3_MASK			(0x00000008u)
+#define OMAPL_MCASP_PDIR_AXR3_SHIFT			(0x00000003u)
+#define OMAPL_MCASP_PDIR_AXR3_RESETVAL			(0x00000000u)
+/*----AXR3 Tokens----*/
+#define OMAPL_MCASP_PDIR_AXR3_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR3_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AXR2_MASK			(0x00000004u)
+#define OMAPL_MCASP_PDIR_AXR2_SHIFT			(0x00000002u)
+#define OMAPL_MCASP_PDIR_AXR2_RESETVAL			(0x00000000u)
+/*----AXR2 Tokens----*/
+#define OMAPL_MCASP_PDIR_AXR2_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR2_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AXR1_MASK			(0x00000002u)
+#define OMAPL_MCASP_PDIR_AXR1_SHIFT			(0x00000001u)
+#define OMAPL_MCASP_PDIR_AXR1_RESETVAL			(0x00000000u)
+/*----AXR1 Tokens----*/
+#define OMAPL_MCASP_PDIR_AXR1_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR1_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_AXR0_MASK			(0x00000001u)
+#define OMAPL_MCASP_PDIR_AXR0_SHIFT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR0_RESETVAL			(0x00000000u)
+/*----AXR0 Tokens----*/
+#define OMAPL_MCASP_PDIR_AXR0_INPUT			(0x00000000u)
+#define OMAPL_MCASP_PDIR_AXR0_OUTPUT			(0x00000001u)
+
+#define OMAPL_MCASP_PDIR_RESETVAL			(0x00000000u)
+
+#define OMAPL_MCASP_ACLKXCTL_CLKXP_MASK			(0x00000080u)
+#define OMAPL_MCASP_ACLKXCTL_CLKXP_SHIFT		(0x00000007u)
+#define OMAPL_MCASP_ACLKXCTL_CLKXP_RESETVAL		(0x00000000u)
+/*----CLKXP Tokens----*/
+#define OMAPL_MCASP_ACLKXCTL_CLKXP_RISINGEDGE		(0x00000000u)
+#define OMAPL_MCASP_ACLKXCTL_CLKXP_FALLINGEDGE		(0x00000001u)
+
+#define OMAPL_MCASP_ACLKXCTL_ASYNC_MASK			(0x00000040u)
+#define OMAPL_MCASP_ACLKXCTL_ASYNC_SHIFT		(0x00000006u)
+#define OMAPL_MCASP_ACLKXCTL_ASYNC_RESETVAL		(0x00000001u)
+/*----ASYNC Tokens----*/
+#define OMAPL_MCASP_ACLKXCTL_ASYNC_SYNC			(0x00000000u)
+#define OMAPL_MCASP_ACLKXCTL_ASYNC_ASYNC		(0x00000001u)
+
+#define OMAPL_MCASP_ACLKXCTL_CLKXM_MASK			(0x00000020u)
+#define OMAPL_MCASP_ACLKXCTL_CLKXM_SHIFT		(0x00000005u)
+#define OMAPL_MCASP_ACLKXCTL_CLKXM_RESETVAL		(0x00000001u)
+/*----CLKXM Tokens----*/
+#define OMAPL_MCASP_ACLKXCTL_CLKXM_EXTERNAL		(0x00000000u)
+#define OMAPL_MCASP_ACLKXCTL_CLKXM_INTERNAL		(0x00000001u)
+
+#define OMAPL_MCASP_ACLKXCTL_CLKXDIV_MASK		(0x0000001Fu)
+#define OMAPL_MCASP_ACLKXCTL_CLKXDIV_SHIFT		(0x00000000u)
+#define OMAPL_MCASP_ACLKXCTL_CLKXDIV_RESETVAL		(0x00000000u)
+
+#define OMAPL_MCASP_ACLKXCTL_RESETVAL			(0x00000060u)
+
+/* AHCLKXCTL */
+#define OMAPL_MCASP_AHCLKXCTL_HCLKXM_MASK		(0x00008000u)
+#define OMAPL_MCASP_AHCLKXCTL_HCLKXM_SHIFT		(0x0000000Fu)
+#define OMAPL_MCASP_AHCLKXCTL_HCLKXM_RESETVAL		(0x00000001u)
+/*----HCLKXM Tokens----*/
+#define OMAPL_MCASP_AHCLKXCTL_HCLKXM_EXTERNAL		(0x00000000u)
+#define OMAPL_MCASP_AHCLKXCTL_HCLKXM_INTERNAL		(0x00000001u)
+
+#define OMAPL_MCASP_AHCLKXCTL_HCLKXP_MASK		(0x00004000u)
+#define OMAPL_MCASP_AHCLKXCTL_HCLKXP_SHIFT		(0x0000000Eu)
+#define OMAPL_MCASP_AHCLKXCTL_HCLKXP_RESETVAL		(0x00000000u)
+/*----HCLKXP Tokens----*/
+#define OMAPL_MCASP_AHCLKXCTL_HCLKXP_NOTINVERTED	(0x00000000u)
+#define OMAPL_MCASP_AHCLKXCTL_HCLKXP_INVERTED		(0x00000001u)
+
+#define OMAPL_MCASP_AHCLKXCTL_HCLKXDIV_MASK		(0x00000FFFu)
+#define OMAPL_MCASP_AHCLKXCTL_HCLKXDIV_SHIFT		(0x00000000u)
+#define OMAPL_MCASP_AHCLKXCTL_HCLKXDIV_RESETVAL		(0x00000000u)
+
+#define OMAPL_MCASP_AHCLKXCTL_RESETVAL			(0x00008000u)
+
+#define MCASP_SUART_GBLCTL				(0X00000000)
+#define MCASP_SUART_RGBLCTL				(0X00000000)
+#define MCASP_SUART_XGBLCTL				(0X00000000)
+#define MCASP_SUART_RMASK_8				(0x000000FF)
+#define MCASP_SUART_RMASK_16				(0x0000FFFF)
+#define MCASP_SUART_RFMT_8				(0x0000A038)
+#define MCASP_SUART_RFMT_16				(0x0000A078)
+#define MCASP_SUART_FSRM				(0X00000002)
+#define MCASP_SUART_CLKRM_CLKRP				(0X000000A0)
+#define MCASP_SUART_HCLKRP				(0X00008000)
+#define MCASP_SUART_RTDMS0				(0X00000001)
+#define MCASP_SUART_RSYNCERR				(0X00000002)
+#define MCASP_SUART_RMAX_RPS_256			(0x00FF0008)
+#define MCASP_SUART_XMASK_0_31				(0X0000FFFF)
+#define MCASP_SUART_XBUSEL_XSSZ_16_XPAD_0		(0x00002078)
+#define MCASP_SUART_FSXM				(0x00000002)
+#define MCASP_SUART_CLKXM_ASYNC_CLKXP			(0x000000E0)
+#define MCASP_SUART_HCLKXM				(0x00008000)
+#define MCASP_SUART_XTDMS0				(0X00000001)
+#define MCASP_SUART_XSYNCERR				(0x00000002)
+#define MCASP_SUART_XMAX_XPS_256			(0x00FF0008)
+#define MCASP_SUART_SRCTL_DISMOD			(0x0000000c)
+#define MCASP_SUART_DIT_DISABLE				(0X00000000)
+#define MCASP_SUART_LOOPBACK_DISABLE			(0x00000000)
+#define MCASP_SUART_AMUTE_DISABLE			(0X00000000)
+#define MCASP_SUART_XSTAT				(0x0000FFFF)
+#define MCASP_SUART_RSTAT				(0x0000FFFF)
+
+/* SUART REGS */
+
+/* PRU0 DATA RAM base address */
+#define PRU0_DATARAM_OFFSET		(0x0000u)
+/* PRU1 DATA RAM base address */
+#define PRU1_DATARAM_OFFSET		(0x2000u)
+
+/* PRU0 DATA RAM size */
+#define PRU0_DATARAM_SIZE		(0x200u)
+/* PRU1 DATA RAM size */
+#define PRU1_DATARAM_SIZE		(0x200u)
+
+#define PRU_SUART_PRU0_CH0_OFFSET	(0x0000)
+#define PRU_SUART_PRU0_CH1_OFFSET	(0x0010)
+#define PRU_SUART_PRU0_CH2_OFFSET	(0x0020)
+#define PRU_SUART_PRU0_CH3_OFFSET	(0x0030)
+#define PRU_SUART_PRU0_CH4_OFFSET	(0x0040)
+#define PRU_SUART_PRU0_CH5_OFFSET	(0x0050)
+#define PRU_SUART_PRU0_CH6_OFFSET	(0x0060)
+#define PRU_SUART_PRU0_CH7_OFFSET	(0x0070)
+#define PRU_SUART_PRU0_IMR_OFFSET	(0x0080)
+/* Interrupt Mask Register */
+#define PRU_SUART_PRU0_ISR_OFFSET	(0x0082)
+/* Interrupt Status Register */
+#define PRU_SUART_PRU0_ID_ADDR		(0x0084)
+/* PRU ID Register */
+#define PRU_SUART_PRU0_RX_TX_MODE	(0x0085)
+#define PRU_SUART_PRU0_DELAY_OFFSET	(0x0086)
+#define PRU_SUART_PRU0_IDLE_TIMEOUT_OFFSET	(0x0088)
+
+/* PRU 1 Macros */
+#define PRU_SUART_PRU1_CH0_OFFSET	(0x2000)
+#define PRU_SUART_PRU1_CH1_OFFSET	(0x2010)
+#define PRU_SUART_PRU1_CH2_OFFSET	(0x2020)
+#define PRU_SUART_PRU1_CH3_OFFSET	(0x2030)
+#define PRU_SUART_PRU1_CH4_OFFSET	(0x2040)
+#define PRU_SUART_PRU1_CH5_OFFSET	(0x2050)
+#define PRU_SUART_PRU1_CH6_OFFSET	(0x2060)
+#define PRU_SUART_PRU1_CH7_OFFSET	(0x2070)
+#define PRU_SUART_PRU1_IMR_OFFSET	(0x2080)
+#define PRU_SUART_PRU1_ISR_OFFSET	(0x2082)
+#define PRU_SUART_PRU1_ID_ADDR		(0x2084)
+#define PRU_SUART_PRU1_RX_TX_MODE	(0x2085)
+#define PRU_SUART_PRU1_DELAY_OFFSET	(0x2086)
+#define PRU_SUART_PRU1_IDLE_TIMEOUT_OFFSET	(0x2088)
+
+/* SUART Channel Control Register bit descriptions */
+#define PRU_SUART_CH_CTRL_MODE_SHIFT		0x0000
+#define PRU_SUART_CH_CTRL_MODE_MASK		0x0003
+#define PRU_SUART_CH_CTRL_TX_MODE		0x0001
+#define PRU_SUART_CH_CTRL_RX_MODE		0x0002
+
+/* Service Request */
+#define PRU_SUART_CH_CTRL_SREQ_SHIFT		0x0002
+#define PRU_SUART_CH_CTRL_SREQ_MASK		0x0004
+#define PRU_SUART_CH_CTRL_SREQ			0x0001
+
+/* McASP Instance */
+#define PRU_SUART_CH_CTRL_MCASP_SHIFT		0x0003
+#define PRU_SUART_CH_CTRL_MCASP_MASK		0x0018
+#define PRU_SUART_CH_CTRL_SR_SHIFT		0x0008
+#define PRU_SUART_CH_CTRL_SR_MASK		0x0F00
+
+/* SUART channel configuration1 register descriptions */
+
+/* clock divisor -  relative baud value */
+#define PRU_SUART_CH_CONFIG1_DIVISOR_SHIFT	0x0000
+#define PRU_SUART_CH_CONFIG1_DIVISOR_MASK	0x03FF
+/* oversampling */
+#define PRU_SUART_CH_CONFIG1_OVS_SHIFT		0x000A
+#define PRU_SUART_CH_CONFIG1_OVS_MASK		0x0C00
+
+/* SUART channel configuration2 register descriptions */
+/* Bits per character */
+#define PRU_SUART_CH_CONFIG2_BITPERCHAR_SHIFT	0x0000
+#define PRU_SUART_CH_CONFIG2_BITPERCHAR_MASK	0x000F
+
+/* Bits per character */
+#define PRU_SUART_CH_CONFIG2_DATALEN_SHIFT	0x0008
+#define PRU_SUART_CH_CONFIG2_DATALEN_MASK	0x0F00
+
+/* SUART Channel STATUS Register*/
+#define PRU_SUART_CH_STATUS_EN_BIT_MASK		0x8000
+
+/* SUART Channel register offsets */
+#define PRU_SUART_CH_CTRL_OFFSET		0x00
+#define PRU_SUART_CH_CONFIG1_OFFSET		0x02
+#define PRU_SUART_CH_CONFIG2_OFFSET		0x04
+#define PRU_SUART_CH_TXRXSTATUS_OFFSET		0x06
+#define PRU_SUART_CH_TXRXDATA_OFFSET		0x08
+#define PRU_SUART_CH_BYTESDONECNTR_OFFSET	0x0C
+
+/* SUART Event Numbers macros */
+#define PRU_SUART0_TX_EVT	34
+#define PRU_SUART0_RX_EVT	35
+#define PRU_SUART1_TX_EVT	36
+#define PRU_SUART1_RX_EVT	37
+#define PRU_SUART2_TX_EVT	38
+#define PRU_SUART2_RX_EVT	39
+#define PRU_SUART3_TX_EVT	40
+#define PRU_SUART3_RX_EVT	41
+#define PRU_SUART4_TX_EVT	42
+#define PRU_SUART4_RX_EVT	43
+#define PRU_SUART5_TX_EVT	44
+#define PRU_SUART5_RX_EVT	45
+#define PRU_SUART6_TX_EVT	46
+#define PRU_SUART6_RX_EVT	47
+#define PRU_SUART7_TX_EVT	48
+#define PRU_SUART7_RX_EVT	49
+
+#define PRU_SUART0_TX_EVT_BIT	BIT(2)
+#define PRU_SUART0_RX_EVT_BIT	BIT(3)
+#define PRU_SUART1_TX_EVT_BIT	BIT(4)
+#define PRU_SUART1_RX_EVT_BIT	BIT(5)
+#define PRU_SUART2_TX_EVT_BIT	BIT(6)
+#define PRU_SUART2_RX_EVT_BIT	BIT(7)
+#define PRU_SUART3_TX_EVT_BIT	BIT(8)
+#define PRU_SUART3_RX_EVT_BIT	BIT(9)
+#define PRU_SUART4_TX_EVT_BIT	BIT(10)
+#define PRU_SUART4_RX_EVT_BIT	BIT(11)
+#define PRU_SUART5_TX_EVT_BIT	BIT(12)
+#define PRU_SUART5_RX_EVT_BIT	BIT(13)
+#define PRU_SUART6_TX_EVT_BIT	BIT(14)
+#define PRU_SUART6_RX_EVT_BIT	BIT(15)
+#define PRU_SUART7_TX_EVT_BIT	BIT(16)
+#define PRU_SUART7_RX_EVT_BIT	BIT(17)
+
+/* Total number of baud rates supported */
+#define SUART_NUM_OF_BAUDS_SUPPORTED	13
+
+#define MCASP_PDIR_VAL ( \
+	OMAPL_MCASP_PDIR_AFSR_OUTPUT<<OMAPL_MCASP_PDIR_AFSR_SHIFT | \
+	OMAPL_MCASP_PDIR_AHCLKR_OUTPUT<<OMAPL_MCASP_PDIR_AHCLKR_SHIFT | \
+	OMAPL_MCASP_PDIR_ACLKR_OUTPUT<<OMAPL_MCASP_PDIR_ACLKR_SHIFT | \
+	OMAPL_MCASP_PDIR_AFSX_OUTPUT<<OMAPL_MCASP_PDIR_AFSX_SHIFT | \
+	OMAPL_MCASP_PDIR_AHCLKX_OUTPUT<<OMAPL_MCASP_PDIR_AHCLKX_SHIFT | \
+	OMAPL_MCASP_PDIR_ACLKX_OUTPUT<<OMAPL_MCASP_PDIR_ACLKX_SHIFT)
+
+/*
+ *  This enum is used to specify the direction of the channel in UART
+ */
+enum SUART_CHN_DIR {
+	SUART_CHN_TX = 1,
+	SUART_CHN_RX = 2
+};
+
+/*
+ *  This enum is used to specify the state of the channel in UART. It
+ *  is either enabled or disabled.
+ */
+enum SUART_CHN_STATE {
+	SUART_CHN_DISABLED = 0,
+	SUART_CHN_ENABLED = 1
+};
+
+enum SUART_EN_BITSPERCHAR {
+	ePRU_SUART_DATA_BITS6 = 8,
+	ePRU_SUART_DATA_BITS7,
+	ePRU_SUART_DATA_BITS8,
+	ePRU_SUART_DATA_BITS9,
+	ePRU_SUART_DATA_BITS10,
+	ePRU_SUART_DATA_BITS11,
+	ePRU_SUART_DATA_BITS12
+};
+
+enum SUART_EN_UARTNUM {
+	ePRU_SUART_NUM_1 = 1,
+	ePRU_SUART_NUM_2,
+	ePRU_SUART_NUM_3,
+	ePRU_SUART_NUM_4,
+	ePRU_SUART_NUM_5,
+	ePRU_SUART_NUM_6,
+	ePRU_SUART_NUM_7,
+	ePRU_SUART_NUM_8
+};
+
+enum SUART_EN_UARTTYPE {
+	ePRU_SUART_HALF_TX = 1,
+	ePRU_SUART_HALF_RX,
+	ePRU_SUART_FULL_TX_RX,
+	ePRU_SUART_HALF_TX_DISABLED = 4,
+	ePRU_SUART_HALF_RX_DISABLED = 8
+};
+
+enum SUART_EN_TXCHANNEL {
+	ePRU_SUART_TX_CH0 = 0,
+	ePRU_SUART_TX_CH1,
+	ePRU_SUART_TX_CH2,
+	ePRU_SUART_TX_CH3,
+	ePRU_SUART_TX_CH4,
+	ePRU_SUART_TX_CH5,
+	ePRU_SUART_TX_CH6,
+	ePRU_SUART_TX_CH7
+};
+
+enum SUART_EN_RXCHANNEL {
+	ePRU_SUART_RX_CH0 = 0,
+	ePRU_SUART_RX_CH1,
+	ePRU_SUART_RX_CH2,
+	ePRU_SUART_RX_CH3,
+	ePRU_SUART_RX_CH4,
+	ePRU_SUART_RX_CH5,
+	ePRU_SUART_RX_CH6,
+	ePRU_SUART_RX_CH7
+};
+
+enum SUART_EN_UART_STATUS {
+	ePRU_SUART_UART_FREE = 0,
+	ePRU_SUART_UART_IN_USE
+};
+
+struct pru_suart_cnh_cntrl_config1 {
+	u32 mode:2;
+	u32 service_req:1;
+	u32 asp_id:2;
+	u32 reserved1:3;
+	u32 serializer_num:4;
+	u32 reserved2:4;
+	u32 presacler:10;
+	u32 over_sampling:2;
+	u32 framing_mask:1;
+	u32 break_mask:1;
+	u32 timeout_mask:1;
+	u32 reserved3:1;
+};
+
+struct pru_suart_chn_config2_status {
+	u32 bits_per_char:4;
+	u32 reserved1:4;
+	u32 data_len:4;
+	u32 reserved2:4;
+	u32 txrx_ready:1;
+	u32 txrx_complete:1;
+	u32 txrx_error:1;
+	u32 txrx_underrun:1;
+	u32 framing_error:1;
+	u32 break_error:1;
+	u32 timeout_error:1;
+	u32 reserved3:8;
+	u32 chn_state:1;
+};
+
+struct pru_suart_regs_ovly {
+	struct pru_suart_cnh_cntrl_config1 ch_ctrl_config1;
+	struct pru_suart_chn_config2_status ch_config2_txrx_status;
+	u32 ch_txrx_data;
+	u32 reserved1;
+};
+
+struct pru_suart_tx_cntx_priv {
+	u32 asp_xsrctl_base;
+	u32 asp_xbuf_base;
+	u16 buff_addr;
+	u8 buff_size;
+	u8 bits_loaded;
+};
+
+struct pru_suart_rx_cntx_priv {
+	u32 asp_rbuf_base;
+	u32 asp_rsrctl_base;
+	u32 reserved1;
+	u32 reserved2;
+	u32 reserved3;
+	u32 reserved4;
+};
+
+struct suart_config {
+	u8  tx_serializer;
+	u8  rx_serializer;
+	u16 tx_clk_divisor;
+	u16 rx_clk_divisor;
+	u8  tx_bits_per_char;
+	u8  rx_bits_per_char;
+	u8  oversampling;
+	u8  bi_inter_mask;
+	u8  fe_intr_mask;
+};
+
+struct suart_handle {
+	u16 uart_num;
+	u16 uart_type;
+	u16 uart_tx_channel;
+	u16 uart_rx_channel;
+	u16 uart_status;
+};
+
+struct pruss_suart_iomap {
+	void __iomem *mcasp_io_addr;
+	void *p_fifo_buff_phys_base;
+	void *p_fifo_buff_virt_base;
+};
+
+struct pruss_suart_initparams {
+	u32 tx_baud_value;
+	u32 rx_baud_value;
+	u32 oversampling;
+};
+
+/* MCASP */
+struct omapl_mcasp_regs_ovly {
+	u32 revid;
+	u32 rsvd0[3];
+	u32 pfunc;
+	u32 pdir;
+	u32 pdout;
+	u32 pdin;
+	u32 pdclr;
+	u32 rsvd1[8];
+	u32 gblctl;
+	u32 amute;
+	u32 dlbctl;
+	u32 ditctl;
+	u32 rsvd2[3];
+	u32 rgblctl;
+	u32 rmask;
+	u32 rfmt;
+	u32 afsrctl;
+	u32 aclkrctl;
+	u32 ahclkrctl;
+	u32 rtdm;
+	u32 rintctl;
+	u32 rstat;
+	u32 rslot;
+	u32 rclkchk;
+	u32 revtctl;
+	u32 rsvd3[4];
+	u32 xgblctl;
+	u32 xmask;
+	u32 xfmt;
+	u32 afsxctl;
+	u32 aclkxctl;
+	u32 ahclkxctl;
+	u32 xtdm;
+	u32 xintctl;
+	u32 xstat;
+	u32 xslot;
+	u32 xclkchk;
+	u32 xevtctl;
+	u32 rsvd4[12];
+	u32 ditcsra[6];
+	u32 ditcsrb[6];
+	u32 ditudra[6];
+	u32 ditudrb[6];
+	u32 rsvd5[8];
+	u32 srctl0;
+	u32 srctl1;
+	u32 srctl2;
+	u32 srctl3;
+	u32 srctl4;
+	u32 srctl5;
+	u32 srctl6;
+	u32 srctl7;
+	u32 srctl8;
+	u32 srctl9;
+	u32 srctl10;
+	u32 srctl11;
+	u32 srctl12;
+	u32 srctl13;
+	u32 srctl14;
+	u32 srctl15;
+	u32 rsvd6[16];
+	u32 xbuf[16];
+	u32 rsvd7[16];
+	u32 rbuf[16];
+};
+
+/*
+ *  SUART Config regs
+ */
+struct suart_struct_pru_regs {
+	u16 chn_ctrl;
+	u16 chn_config1;
+	u16 chn_config2;
+	u16 chn_txrx_status;
+	u32 chn_txrx_data;
+};
+
+extern s32 pru_softuart_init(struct device *dev,
+			struct pruss_suart_initparams *,
+			const u8 *pru_suart_emu_code, u32 fw_size,
+			u32 clk_rate_pruss,
+			struct pruss_suart_iomap *pruss_ioaddr);
+
+extern s32 pru_softuart_open(struct suart_handle *h_suart);
+
+extern s32 pru_softuart_close(struct suart_handle *h_uart);
+
+extern s32 pru_softuart_setbaud(struct device *dev,
+			struct suart_handle *h_uart,
+			u16 tx_clk_divisor, u16 rx_clk_divisor);
+
+extern s32 pru_softuart_setdatabits(struct device *dev,
+			struct suart_handle *h_uart,
+			u16 tx_data_bits, u16 rx_data_bits);
+
+extern s32 pru_softuart_setconfig(struct device *dev,
+			struct suart_handle *h_uart,
+			struct suart_config *config_uart);
+
+extern s32 pru_softuart_getconfig(struct device *dev,
+			struct suart_handle *h_uart,
+			struct suart_config *config_uart);
+
+extern s32 pru_softuart_pending_tx_request(struct device *dev);
+
+extern s32 pru_softuart_write(struct device *dev,
+			struct suart_handle *h_uart,
+			u32 *pt_tx_data_buf, u16 data_len);
+
+extern s32 pru_softuart_read(struct device *dev,
+			struct suart_handle *h_uart,
+			u32 *pt_data_buf, u16 data_len);
+
+extern s32 suart_intr_clrmask(struct device *dev, u16 uart_num,
+						u32 txrxmode,
+						u32 intrmask);
+
+extern s32 pru_softuart_clr_tx_status(struct device *dev,
+				struct suart_handle *h_uart);
+
+extern s32 pru_softuart_get_tx_status(struct device *dev,
+				struct suart_handle *h_uart);
+
+extern s32 pru_softuart_clr_rx_status(struct device *dev,
+				struct suart_handle *h_uart);
+
+extern s32 pru_softuart_get_rx_status(struct device *dev,
+				struct suart_handle *h_uart);
+
+extern s32 pru_softuart_get_isrstatus(struct device *dev, u16 uart_num,
+			u16 *txrx_flag);
+
+extern s32 pru_intr_clr_isrstatus(struct device *dev, u16 uart_num,
+							u32 txrxmode);
+
+extern s32 suart_intr_getmask(struct device *dev, u16 uart_num,
+						u32 txrxmode,
+						u32 intrmask);
+
+extern s32 suart_intr_setmask(struct device *dev, u16 uart_num,
+			u32 txrxmode, u32 intrmask);
+
+extern s32 pru_softuart_get_tx_data_len(struct device *dev,
+				struct suart_handle *h_uart);
+
+extern s32 pru_softuart_get_rx_data_len(struct device *dev,
+				struct suart_handle *h_uart);
+
+extern s32 suart_arm_to_pru_intr(struct device *dev, u16 uart_num);
+
+extern void pru_mcasp_deinit(void);
+
+extern s32 pru_softuart_read_data(struct device *dev,
+			struct suart_handle *h_uart,
+			u8 *p_data_buffer, s32 max_len,
+			u32 *pdata_read);
+
+extern s32 pru_softuart_stop_receive(struct device *dev,
+				struct suart_handle *h_uart);
+
+extern s32 suart_pru_to_host_intr_enable(struct device *dev,
+					u16 uart_num,
+					u32 txrxmode, s32 flag);
+
+extern void pru_set_fifo_timeout(struct device *dev, s16 timeout);
+
+extern void suart_mcasp_config(u32 tx_baud_value,
+			u32 rx_baud_value, u32 oversampling,
+			struct pruss_suart_iomap *pruss_ioaddr);
+
+extern void suart_mcasp_reset(struct pruss_suart_iomap *pruss_ioaddr);
+
+extern short suart_asp_baud_set(u32 tx_baud_value,
+			u32 rx_baud_value, u32 oversampling,
+			struct pruss_suart_iomap *pruss_ioaddr);
+
+extern short suart_asp_serializer_deactivate(u16 sr_num,
+			struct pruss_suart_iomap *pruss_ioaddr);
+
+extern void suart_mcasp_tx_serialzier_set(u32 serializer_num,
+			struct pruss_suart_iomap *pruss_ioaddr);
+#endif
diff --git a/drivers/tty/serial/pruss_suart_api.c b/drivers/tty/serial/pruss_suart_api.c
new file mode 100644
index 0000000..15178f5
--- /dev/null
+++ b/drivers/tty/serial/pruss_suart_api.c
@@ -0,0 +1,1710 @@
+/*
+ * Copyright (C) 2010, 2011 Texas Instruments Incorporated
+ * Author: Jitendra Kumar <jitendra@mistralsolutions.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as  published by the
+ * Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
+ * whether express or implied; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+
+#include <linux/types.h>
+#include <linux/mfd/pruss.h>
+#include "pruss_suart.h"
+
+static u8 uart_statu_table[8];
+static struct pruss_suart_iomap suart_iomap;
+
+static u32 uart_rx[8] = {PRU_SUART0_CONFIG_RX_SER, PRU_SUART1_CONFIG_RX_SER,
+			PRU_SUART2_CONFIG_RX_SER, PRU_SUART3_CONFIG_RX_SER,
+			PRU_SUART4_CONFIG_RX_SER, PRU_SUART5_CONFIG_RX_SER,
+			PRU_SUART6_CONFIG_RX_SER, PRU_SUART7_CONFIG_RX_SER};
+
+static u32 uart_tx[8] = {PRU_SUART0_CONFIG_TX_SER, PRU_SUART1_CONFIG_TX_SER,
+			PRU_SUART2_CONFIG_TX_SER, PRU_SUART3_CONFIG_TX_SER,
+			PRU_SUART4_CONFIG_TX_SER, PRU_SUART5_CONFIG_TX_SER,
+			PRU_SUART6_CONFIG_TX_SER, PRU_SUART7_CONFIG_TX_SER};
+
+static u32 uart_config[8] = {PRU_SUART0_CONFIG_DUPLEX, PRU_SUART1_CONFIG_DUPLEX,
+			PRU_SUART2_CONFIG_DUPLEX, PRU_SUART3_CONFIG_DUPLEX,
+			PRU_SUART4_CONFIG_DUPLEX, PRU_SUART5_CONFIG_DUPLEX,
+			PRU_SUART6_CONFIG_DUPLEX, PRU_SUART7_CONFIG_DUPLEX};
+
+static  s32 pru_softuart_clr_rx_fifo(struct device *dev,
+				struct suart_handle *h_uart);
+static s32 arm_to_pru_intr_init(struct device *dev);
+
+#if (PRU_ACTIVE == BOTH_PRU)
+static void pru_set_ram_data(struct device *dev,
+			struct pruss_suart_iomap *pruss_ioaddr)
+{
+	u32 datatowrite;
+	u32 i;
+	struct pru_suart_regs_ovly *pru_suart_regs = NULL;
+	u32 __iomem *p_sr_ctl_addr = (u32 __iomem *)(pruss_ioaddr->
+						mcasp_io_addr + 0x180);
+	struct pru_suart_tx_cntx_priv *pru_suart_tx_priv = NULL;
+	struct pru_suart_rx_cntx_priv *pru_suart_rx_priv = NULL;
+
+	/* RX PRU - 0 Chanel 0-7 context information */
+	for (i = 0; i < 8; i++, pru_suart_regs++) {
+		pruss_rmwl(dev, (u32) &pru_suart_regs->ch_ctrl_config1,
+						0x3, SUART_CHN_RX);
+		pruss_rmwl(dev, (u32) &pru_suart_regs->ch_ctrl_config1,
+				(0xF << SERIALIZER_OFFSET),
+				((0xF & uart_rx[i]) << SERIALIZER_OFFSET));
+		pruss_rmwl(dev, (u32) &pru_suart_regs->ch_ctrl_config1,
+				(0x3 << SUART_DEFAULT_OVRSMPL_OFFSET),
+				(SUART_DEFAULT_OVRSMPL <<
+				SUART_DEFAULT_OVRSMPL_OFFSET));
+		pruss_rmwl(dev, (u32) &pru_suart_regs->ch_config2_txrx_status,
+								0xF, 8);
+		if ((uart_config[i] & PRU_SUART_HALF_RX_DISABLED) ==
+					PRU_SUART_HALF_RX_DISABLED) {
+			pruss_rmwl(dev,
+				(u32) &pru_suart_regs->ch_config2_txrx_status,
+				(0x1 << SUART_CHN_OFFSET),
+				(SUART_CHN_DISABLED << SUART_CHN_OFFSET));
+		} else {
+			pruss_rmwl(dev,
+				(u32) &pru_suart_regs->ch_config2_txrx_status,
+				(0x1 << SUART_CHN_OFFSET),
+				(SUART_CHN_ENABLED << SUART_CHN_OFFSET));
+			iowrite32(MCASP_SRCTL_RX_MODE, p_sr_ctl_addr +
+								uart_rx[i]);
+		}
+		/*
+		 * RX is active by default, write the dummy received data at
+		 * PRU RAM addr 0x1FC to avoid memory corruption.
+		 */
+		pruss_rmwl(dev, (u32) &pru_suart_regs->ch_txrx_data,
+				0xFFFF, RX_DEFAULT_DATA_DUMP_ADDR);
+		pruss_rmwl(dev, (u32) &pru_suart_regs->reserved1, 0xFFFF, 0);
+		/* SUART1 RX context base addr */
+		pru_suart_rx_priv = (struct pru_suart_rx_cntx_priv *)
+				(PRU0_DATARAM_OFFSET + (0x090 + (i * 0x020)));
+		datatowrite = (MCASP_RBUF_BASE_ADDR + (uart_rx[i] << 2));
+		pruss_writel(dev, (u32) &pru_suart_rx_priv->asp_rbuf_base,
+							datatowrite);
+		datatowrite = (MCASP_SRCTL_BASE_ADDR + (uart_rx[i] << 2));
+		pruss_writel(dev, (u32) &pru_suart_rx_priv->asp_rsrctl_base,
+							datatowrite);
+	}
+
+	/* PRU1 RAM BASE ADDR */
+	pru_suart_regs = (struct pru_suart_regs_ovly *) PRU1_DATARAM_OFFSET;
+
+	/* TX PRU - 1 */
+	/* Channel 0-7 context information */
+	for (i = 0; i < 8; i++, pru_suart_regs++) {
+		pruss_rmwl(dev, (u32) &pru_suart_regs->ch_ctrl_config1,
+						0x3, SUART_CHN_TX);
+		pruss_rmwl(dev, (u32) &pru_suart_regs->ch_ctrl_config1,
+				(0xF << SERIALIZER_OFFSET),
+				((0xF & uart_tx[i]) << SERIALIZER_OFFSET));
+		pruss_rmwl(dev, (u32) &pru_suart_regs->ch_ctrl_config1,
+				(0x3 << SUART_DEFAULT_OVRSMPL_OFFSET),
+				(SUART_DEFAULT_OVRSMPL <<
+				SUART_DEFAULT_OVRSMPL_OFFSET));
+		pruss_rmwl(dev,
+			(u32) &pru_suart_regs->ch_config2_txrx_status, 0xF, 8);
+
+		if ((uart_config[i] & PRU_SUART_HALF_TX_DISABLED) ==
+						PRU_SUART_HALF_TX_DISABLED) {
+			pruss_rmwl(dev, (u32)
+				&pru_suart_regs->ch_config2_txrx_status,
+				(0x1 << SUART_CHN_OFFSET),
+				(SUART_CHN_DISABLED << SUART_CHN_OFFSET));
+		} else {
+			pruss_rmwl(dev,
+				(u32) &pru_suart_regs->ch_config2_txrx_status,
+				(0x1 << SUART_CHN_OFFSET),
+				(SUART_CHN_ENABLED << SUART_CHN_OFFSET));
+			iowrite32(MCASP_SRCTL_TX_MODE,
+				p_sr_ctl_addr + uart_tx[i]);
+		}
+		pruss_rmwl(dev, (u32) &pru_suart_regs->reserved1, 0xFFFF, 1);
+
+		/* SUART1 TX context base addr */
+		pru_suart_tx_priv = (struct pru_suart_tx_cntx_priv *)
+			(PRU1_DATARAM_OFFSET + (0x0B0 + (i * 0x02C)));
+		datatowrite = (MCASP_SRCTL_BASE_ADDR + (uart_tx[i] << 2));
+		pruss_writel(dev, (u32) &pru_suart_tx_priv->asp_xsrctl_base,
+							datatowrite);
+		datatowrite = (MCASP_XBUF_BASE_ADDR + (uart_tx[i] << 2));
+		pruss_writel(dev, (u32) &pru_suart_tx_priv->asp_xbuf_base,
+							datatowrite);
+		/* SUART1 TX formatted data base addr */
+		datatowrite = (0x0090 + (i * 0x002C));
+		pruss_writel(dev, (u32) &pru_suart_tx_priv->buff_addr,
+							datatowrite);
+	}
+}
+#else
+static void pru_set_ram_data(struct device *dev,
+			struct pruss_suart_iomap *pruss_ioaddr)
+{
+
+	struct pru_suart_regs_ovly *pru_suart_regs =
+		(struct pru_suart_regs_ovly *)pruss_ioaddr->pru_io_addr;
+	u32 i;
+	u32 *p_sr_ctl_addr = (u32 *)(pruss_ioaddr->mcasp_io_addr + 0x180);
+	struct pru_suart_tx_cntx_priv *pru_suart_tx_priv = NULL;
+	struct pru_suart_rx_cntx_priv *pru_suart_rx_priv = NULL;
+
+	/* Channel 0 context information is Tx */
+	for (i = 0; i < 4; i++, pru_suart_regs++) {
+		pruss_rmwl(dev, (u32) &pru_suart_regs->ch_ctrl_config1,
+						0x3, SUART_CHN_TX);
+		pruss_rmwl(dev, (u32) &pru_suart_regs->ch_ctrl_config1,
+						(0xF << SERIALIZER_OFFSET),
+				((0xF & uart_tx[i]) << SERIALIZER_OFFSET));
+		pruss_rmwl(dev, (u32) &pru_suart_regs->ch_ctrl_config1,
+				(0x3 << SUART_DEFAULT_OVRSMPL_OFFSET),
+				(SUART_DEFAULT_OVRSMPL <<
+				SUART_DEFAULT_OVRSMPL_OFFSET));
+		pruss_rmwl(dev, (u32) &pru_suart_regs->ch_config2_txrx_status,
+								0xF, 8);
+		if ((uart_config[i] & PRU_SUART_HALF_TX_DISABLED) ==
+						PRU_SUART_HALF_TX_DISABLED){
+			pruss_rmwl(dev, (u32)
+				&pru_suart_regs->ch_config2_txrx_status,
+				(0x1 << SUART_CHN_OFFSET),
+				(SUART_CHN_DISABLED << SUART_CHN_OFFSET));
+		} else {
+			pruss_rmwl(dev,
+				(u32) &pru_suart_regs->ch_config2_txrx_status,
+				(0x1 << SUART_CHN_OFFSET),
+				(SUART_CHN_ENABLED << SUART_CHN_OFFSET));
+			iowrite32(MCASP_SRCTL_TX_MODE,
+						p_sr_ctl_addr + uart_tx[i]);
+		}
+		pruss_rmwl(dev, (u32) &pru_suart_regs->reserved1, 0xFFFF, 1);
+
+		/* SUART1 TX context base addr */
+		pru_suart_tx_priv = (struct pru_suart_tx_cntx_priv *)
+				(PRU0_DATARAM_OFFSET + (0x0B0 + (i * 0x50)));
+		pruss_writel(dev, (u32) &pru_suart_tx_priv->asp_xsrctl_base,
+				(MCASP_SRCTL_BASE_ADDR + (uart_tx[i] << 2)));
+		pruss_writel(dev, (u32) &pru_suart_tx_priv->asp_xbuf_base,
+				(MCASP_XBUF_BASE_ADDR + (uart_tx[i] << 2)));
+		/* SUART1 TX formatted data base addr */
+		pruss_writel(dev, (u32) &pru_suart_tx_priv->buff_addr,
+					(0x0090 + (i * 0x050)));
+
+		/* Channel 1 is Rx context information */
+		pru_suart_regs++;
+		pruss_rmwl(dev, (u32) &pru_suart_regs->ch_ctrl_config1,
+							0x3, SUART_CHN_RX);
+		pruss_rmwl(dev, (u32) &pru_suart_regs->ch_ctrl_config1,
+						(0xF << SERIALIZER_OFFSET),
+				((0xF & uart_rx[i]) << SERIALIZER_OFFSET));
+		pruss_rmwl(dev, (u32) &pru_suart_regs->ch_ctrl_config1,
+				(0x3 << SUART_DEFAULT_OVRSMPL_OFFSET),
+				(SUART_DEFAULT_OVRSMPL <<
+				SUART_DEFAULT_OVRSMPL_OFFSET));
+		pruss_rmwl(dev,
+			(u32) &pru_suart_regs->ch_config2_txrx_status, 0xF, 8);
+
+		if ((uart_config[i] & PRU_SUART_HALF_RX_DISABLED) ==
+						PRU_SUART_HALF_RX_DISABLED) {
+			pruss_rmwl(dev,
+				(u32) &pru_suart_regs->ch_config2_txrx_status,
+				(0x1 << SUART_CHN_OFFSET),
+				(SUART_CHN_DISABLED << SUART_CHN_OFFSET));
+		} else {
+			pruss_rmwl(dev,
+				(u32) &pru_suart_regs->ch_config2_txrx_status,
+				(0x1 << SUART_CHN_OFFSET),
+				(SUART_CHN_ENABLED << SUART_CHN_OFFSET));
+			iowrite32(MCASP_SRCTL_RX_MODE,
+					p_sr_ctl_addr + uart_rx[i]);
+		}
+		/*
+		 * RX is active by default, write the dummy received data
+		 *@PRU RAM addr 0x1FC to avoid memory corruption
+		 */
+		pruss_rmwl(dev, (u32) &pru_suart_regs->ch_txrx_data,
+				0xFFFF, RX_DEFAULT_DATA_DUMP_ADDR);
+		pruss_rmwl(dev, (u32) &pru_suart_regs->reserved1, 0xFFFF, 0);
+		/* SUART1 RX context base addr */
+		pru_suart_rx_priv = (struct pru_suart_rx_cntx_priv *)
+			(PRU0_DATARAM_OFFSET + (0x0C0 + (i * 0x50)));
+		pruss_writel(dev, (u32) &pru_suart_rx_priv->asp_rbuf_base,
+				(MCASP_RBUF_BASE_ADDR + (uart_rx[i] << 2)));
+		pruss_writel(dev, (u32) &pru_suart_rx_priv->asp_rsrctl_base,
+				(MCASP_SRCTL_BASE_ADDR + (uart_rx[i] << 2)));
+	}
+}
+#endif
+
+static void pru_set_rx_tx_mode(struct device *dev, u32 pru_mode, u32 pru_num)
+{
+	u32 pru_offset;
+
+	if (pru_num == PRUSS_NUM0)
+		pru_offset = PRU_SUART_PRU0_RX_TX_MODE;
+	else if (pru_num == PRUSS_NUM1)
+		pru_offset = PRU_SUART_PRU1_RX_TX_MODE;
+	else
+		return;
+	pruss_writeb(dev, pru_offset, (u8) pru_mode);
+}
+
+static void pru_set_delay_count(struct device *dev, u32 pru_freq)
+{
+	u32 delay_cnt;
+
+	if (pru_freq == PRU_CLK_228)
+		delay_cnt = 5;
+	else if (pru_freq == PRU_CLK_186)
+		delay_cnt = 5;
+	else
+		delay_cnt = 3;
+
+	/* PRU 0 */
+	pruss_writeb(dev, PRU_SUART_PRU0_DELAY_OFFSET,
+		(u8) delay_cnt);
+
+	/* PRU 1 */
+	pruss_writeb(dev, PRU_SUART_PRU1_DELAY_OFFSET,
+		(u8) delay_cnt);
+}
+
+static s32 suart_set_pru_id(struct device *dev, u32 pru_no)
+{
+	u32 offset;
+	u8 reg_val = 0;
+
+	if (PRUSS_NUM0 == pru_no)
+		offset = PRU_SUART_PRU0_ID_ADDR;
+	else if (PRUSS_NUM1 == pru_no)
+		offset = PRU_SUART_PRU1_ID_ADDR;
+	else
+		return -EINVAL;
+
+	reg_val = pru_no;
+	pruss_writeb(dev, offset, reg_val);
+
+	return 0;
+}
+
+/*
+ * suart Initialization routine
+ */
+s32 pru_softuart_init(struct device *dev,
+			struct pruss_suart_initparams *init_params,
+			const u8 *pru_suart_emu_code, u32 fw_size,
+			u32 clk_rate_pruss,
+			struct pruss_suart_iomap *pruss_ioaddr)
+{
+	u32 datatowrite[128] = {0};
+	s16 status = 0;
+	s16 idx;
+	s16 retval;
+	u16 i;
+
+	if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH) &&
+				(PRU1_MODE == PRU_MODE_RX_TX_BOTH))
+		return -EINVAL;
+
+	suart_iomap.mcasp_io_addr = pruss_ioaddr->mcasp_io_addr;
+	suart_iomap.p_fifo_buff_phys_base =
+			pruss_ioaddr->p_fifo_buff_phys_base;
+	suart_iomap.p_fifo_buff_virt_base =
+			pruss_ioaddr->p_fifo_buff_virt_base;
+	/* Configure McASP0  */
+	suart_mcasp_config(init_params->tx_baud_value,
+				init_params->rx_baud_value,
+				init_params->oversampling, pruss_ioaddr);
+	pruss_enable(dev, PRUSS_NUM0);
+
+	if (PRU1_MODE != PRU_MODE_INVALID)
+		pruss_enable(dev, PRUSS_NUM1);
+
+	/* Reset PRU RAM */
+	for (i = 0; i < (PRU0_DATARAM_SIZE / sizeof(int)); i++)
+		pruss_writel(dev, (PRU0_DATARAM_OFFSET + (i * sizeof(int))),
+							datatowrite[i]);
+	if (PRU1_MODE != PRU_MODE_INVALID) {
+		for (i = 0; i < (PRU1_DATARAM_SIZE / sizeof(int)); i++)
+			pruss_writel(dev, (PRU1_DATARAM_OFFSET +
+					(i * sizeof(int))), datatowrite[i]);
+	}
+
+	pruss_load(dev, PRUSS_NUM0, (u32 *)pru_suart_emu_code,
+					(fw_size / sizeof(u32)));
+	if (PRU1_MODE != PRU_MODE_INVALID)
+		pruss_load(dev, PRUSS_NUM1, (u32 *)pru_suart_emu_code,
+					(fw_size / sizeof(u32)));
+
+	retval = arm_to_pru_intr_init(dev);
+	if (-1 == retval)
+		return status;
+	pru_set_delay_count(dev, clk_rate_pruss);
+	suart_set_pru_id(dev, PRUSS_NUM0);
+	if (PRU1_MODE != PRU_MODE_INVALID)
+		suart_set_pru_id(dev, PRUSS_NUM1);
+
+	pru_set_rx_tx_mode(dev, PRU0_MODE, PRUSS_NUM0);
+	if (PRU1_MODE != PRU_MODE_INVALID)
+		pru_set_rx_tx_mode(dev, PRU1_MODE, PRUSS_NUM1);
+
+	pru_set_ram_data(dev, pruss_ioaddr);
+	pruss_run(dev, PRUSS_NUM0);
+
+	if (PRU1_MODE != PRU_MODE_INVALID)
+		pruss_run(dev, PRUSS_NUM1);
+
+	/* Initialize uart_statu_table */
+	for (idx = 0; idx < 8; idx++)
+		uart_statu_table[idx] = ePRU_SUART_UART_FREE;
+
+	return status;
+}
+
+void pru_set_fifo_timeout(struct device *dev, s16 timeout)
+{
+	pruss_writew(dev, PRU_SUART_PRU0_IDLE_TIMEOUT_OFFSET, (u16) timeout);
+	if (PRU1_MODE != PRU_MODE_INVALID)
+		pruss_writew(dev, PRU_SUART_PRU1_IDLE_TIMEOUT_OFFSET,
+						(u16) timeout);
+}
+
+void pru_mcasp_deinit(void)
+{
+	suart_mcasp_reset(&suart_iomap);
+}
+
+/* suart Instance open routine  */
+s32 pru_softuart_open(struct suart_handle *h_suart)
+{
+	s16 status = 0;
+	u16 uart_num = h_suart->uart_num - 1;
+
+	if (uart_statu_table[h_suart->uart_num - 1] ==
+			ePRU_SUART_UART_IN_USE) {
+		return -EUSERS;
+	} else {
+		h_suart->uart_type = uart_config[uart_num];
+		h_suart->uart_tx_channel = uart_tx[uart_num];
+		h_suart->uart_rx_channel = uart_rx[uart_num];
+		h_suart->uart_status = ePRU_SUART_UART_IN_USE;
+		uart_statu_table[h_suart->uart_num - 1] =
+						ePRU_SUART_UART_IN_USE;
+	}
+	return status;
+}
+
+/* suart instance close routine */
+s32 pru_softuart_close(struct suart_handle *h_uart)
+{
+	s16 status = 0;
+
+	if (h_uart == NULL) {
+		WARN_ON(1);
+		return -EINVAL;
+	} else {
+		uart_statu_table[h_uart->uart_num - 1] =
+			ePRU_SUART_UART_FREE;
+		/* Reset the Instance to Invalid */
+		h_uart->uart_num = PRU_SUART_UARTx_INVALID;
+		h_uart->uart_status = ePRU_SUART_UART_FREE;
+	}
+	return status;
+}
+
+static s32 search_chnum(u16 uart_num, u16 *ch_num, u32 *pru_offset, u16 mode)
+{
+	if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH)
+		|| (PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
+		*ch_num = (uart_num * SUART_NUM_OF_CHANNELS_PER_SUART) - 2;
+		if (uart_num <= 4) {
+			*pru_offset = PRU_SUART_PRU0_CH0_OFFSET;
+		} else {
+			*pru_offset = PRU_SUART_PRU1_CH0_OFFSET;
+			*ch_num -= 8;
+		}
+		(mode == 2) ? ++*ch_num : *ch_num;
+	} else if (mode == 1) {
+			if (PRU0_MODE == PRU_MODE_TX_ONLY)
+				*pru_offset = PRU_SUART_PRU0_CH0_OFFSET;
+			else if (PRU1_MODE == PRU_MODE_TX_ONLY)
+				*pru_offset = PRU_SUART_PRU1_CH0_OFFSET;
+	} else if (mode == 2) {
+			if (PRU0_MODE == PRU_MODE_RX_ONLY)
+				*pru_offset = PRU_SUART_PRU0_CH0_OFFSET;
+			else if (PRU1_MODE == PRU_MODE_RX_ONLY)
+				*pru_offset = PRU_SUART_PRU1_CH0_OFFSET;
+	}
+	return 0;
+}
+
+/*
+ * suart routine for setting relative baud rate
+ */
+s32 pru_softuart_setbaud(struct device *dev, struct suart_handle *h_uart,
+		u16 tx_clk_divisor, u16 rx_clk_divisor)
+{
+	u32 offset;
+	u32 pru_offset;
+	s16 status = 0;
+	u16 ch_num = h_uart->uart_num - 1;
+	u16 regval = 0;
+
+	if (h_uart == NULL) {
+		WARN_ON(1);
+		return -EINVAL;
+	}
+
+	/* Set the clock divisor value s32o the McASP */
+	if ((tx_clk_divisor > 385) || (tx_clk_divisor == 0))
+		return -EINVAL;
+	if ((rx_clk_divisor > 385) || (rx_clk_divisor == 0))
+		return -EINVAL;
+	search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 1);
+
+	if (tx_clk_divisor != 0) {
+		offset = pru_offset +
+			(ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+			PRU_SUART_CH_CONFIG1_OFFSET;
+		pruss_readw(dev, offset, (u16 *) &regval);
+		regval &= (~0x3FF);
+		regval |= tx_clk_divisor;
+		pruss_writew(dev, offset, regval);
+	}
+	if (PRU0_MODE == PRU_MODE_RX_ONLY) {
+		pru_offset = PRU_SUART_PRU0_CH0_OFFSET;
+	} else if (PRU1_MODE == PRU_MODE_RX_ONLY) {
+		pru_offset = PRU_SUART_PRU1_CH0_OFFSET;
+	} else if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH) ||
+			(PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
+		ch_num++;
+	} else {
+		return 0;
+	}
+	regval = 0;
+	if (rx_clk_divisor != 0) {
+		offset = pru_offset +
+			(ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+			PRU_SUART_CH_CONFIG1_OFFSET;
+		pruss_readw(dev, offset, (u16 *) &regval);
+		regval &= (~0x3FF);
+		regval |= tx_clk_divisor;
+		pruss_writew(dev, offset, regval);
+	}
+	return status;
+}
+
+/*
+ * suart routine for setting number of bits per character for a specific uart
+ */
+s32 pru_softuart_setdatabits(struct device *dev, struct suart_handle *h_uart,
+		u16 tx_data_bits, u16 rx_data_bits)
+{
+	u32 offset;
+	u32 pru_offset;
+	s16 status = 0;
+	u16 ch_num = h_uart->uart_num - 1;
+	u32 reg_val;
+
+	if (h_uart == NULL) {
+		WARN_ON(1);
+		return -EINVAL;
+	}
+
+	/*
+	 * NOTE:
+	 * The supported data bits are 6,7,8,9,10,11,12 bits per character
+	 */
+
+	if ((tx_data_bits < ePRU_SUART_DATA_BITS6)
+			|| (tx_data_bits > ePRU_SUART_DATA_BITS12))
+		return -EINVAL;
+
+	if ((rx_data_bits < ePRU_SUART_DATA_BITS6)
+			|| (rx_data_bits > ePRU_SUART_DATA_BITS12))
+		return -EINVAL;
+	search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 1);
+
+	if (tx_data_bits != 0) {
+		offset = pru_offset +
+			(ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+			PRU_SUART_CH_CONFIG2_OFFSET;
+		pruss_readb(dev, offset, (u8 *) &reg_val);
+		reg_val &= ~(0xF);
+		reg_val |= tx_data_bits;
+		pruss_writeb(dev, offset, (u8) reg_val);
+	}
+	if (PRU0_MODE == PRU_MODE_RX_ONLY) {
+		pru_offset = PRU_SUART_PRU0_CH0_OFFSET;
+	} else if (PRU1_MODE == PRU_MODE_RX_ONLY) {
+		pru_offset = PRU_SUART_PRU1_CH0_OFFSET;
+	} else if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH)
+			|| (PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
+		ch_num++;
+	} else {
+		return 0;
+	}
+	if (rx_data_bits != 0) {
+		offset = pru_offset +
+			(ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+			PRU_SUART_CH_CONFIG2_OFFSET;
+		pruss_readb(dev, offset, (u8 *) &reg_val);
+		reg_val &= ~(0xF);
+		reg_val |= rx_data_bits;
+		pruss_writeb(dev, offset, (u8) rx_data_bits);
+	}
+
+	return status;
+}
+
+/*
+ * suart routine to configure specific uart
+ */
+s32 pru_softuart_setconfig(struct device *dev, struct suart_handle *h_uart,
+				struct suart_config *config_uart)
+{
+	u32 offset;
+	u32 pru_offset;
+	s16 status = 0;
+	u16 ch_num = h_uart->uart_num - 1;
+	u16 reg_val = 0;
+
+	if (h_uart == NULL) {
+		WARN_ON(1);
+		return -EINVAL;
+	}
+
+	/*
+	 * NOTE:
+	 * Dependent baud rate for the given UART,the value MUST BE LESS THAN OR
+	 * EQUAL TO 64, preScalarValue <= 64
+	 */
+	if ((config_uart->tx_clk_divisor > 384)
+			|| (config_uart->rx_clk_divisor > 384)) {
+		return -EINVAL;
+	}
+	if ((config_uart->tx_bits_per_char < 8)
+			|| (config_uart->tx_bits_per_char > 14)) {
+		return -EINVAL;
+	}
+	if ((config_uart->rx_bits_per_char < 8)
+			|| (config_uart->rx_bits_per_char > 14)) {
+		return -EINVAL;
+	}
+	search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 1);
+
+	/*
+	 * Configuring the Transmit part of the given UART
+	 * Serializer has been as TX in mcasp config, by writing 1 in bits
+	 * corresponding to tx serializer in PFUNC regsiter ie already set
+	 * to GPIO mode PRU code will set then back to MCASP mode once TX
+	 * request for that serializer is posted.It is required because at this
+	 * pos32 Mcasp is accessed by both PRU and DSP have lower priority for
+	 * Mcasp in comparison to PRU and DPS keeps on looping there only
+	 *
+	 * suart_mcasp_tx_serialzier_set
+	 * (config_uart->tx_serializer, &suart_iomap);
+	 */
+
+	/* Configuring TX serializer  */
+	if (config_uart->tx_serializer != PRU_SUART_SERIALIZER_NONE) {
+		offset = pru_offset +
+			(ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+			PRU_SUART_CH_CTRL_OFFSET;
+		pruss_readw(dev, offset, (u16 *) &reg_val);
+		reg_val = reg_val | (config_uart->tx_serializer <<
+			PRU_SUART_CH_CTRL_SR_SHIFT);
+		pruss_writew(dev, offset, reg_val);
+		offset = pru_offset +
+			(ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+			PRU_SUART_CH_CONFIG1_OFFSET;
+		pruss_readw(dev, offset, (u16 *) &reg_val);
+		reg_val = reg_val | (config_uart->tx_clk_divisor <<
+			PRU_SUART_CH_CONFIG1_DIVISOR_SHIFT);
+		pruss_writew(dev, offset, reg_val);
+		offset = pru_offset +
+			(ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+			PRU_SUART_CH_CONFIG2_OFFSET;
+		pruss_readw(dev, offset, (u16 *) &reg_val);
+		reg_val = reg_val | (config_uart->tx_bits_per_char <<
+			PRU_SUART_CH_CONFIG2_BITPERCHAR_SHIFT);
+		pruss_writew(dev, offset, reg_val);
+	}
+
+	if (PRU0_MODE == PRU_MODE_RX_ONLY) {
+		pru_offset = PRU_SUART_PRU0_CH0_OFFSET;
+	} else if (PRU1_MODE == PRU_MODE_RX_ONLY) {
+		pru_offset = PRU_SUART_PRU1_CH0_OFFSET;
+	} else if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH) ||
+			(PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
+		ch_num++;
+	} else {
+		return 0;
+	}
+
+	/* Configuring the Transmit part of the given UART */
+	if (config_uart->rx_serializer != PRU_SUART_SERIALIZER_NONE) {
+		/* Configuring RX serializer  */
+		offset = pru_offset +
+			(ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+			PRU_SUART_CH_CTRL_OFFSET;
+		pruss_readw(dev, offset, (u16 *) &reg_val);
+		reg_val = reg_val | (config_uart->rx_serializer <<
+			PRU_SUART_CH_CTRL_SR_SHIFT);
+		pruss_writew(dev, offset, reg_val);
+
+		/* Configuring RX prescalar value and Oversampling */
+		offset = pru_offset +
+			(ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+			PRU_SUART_CH_CONFIG1_OFFSET;
+		pruss_readw(dev, offset, (u16 *) &reg_val);
+		reg_val = reg_val | (config_uart->rx_clk_divisor <<
+			PRU_SUART_CH_CONFIG1_DIVISOR_SHIFT) |
+			(config_uart->oversampling <<
+			PRU_SUART_CH_CONFIG1_OVS_SHIFT);
+		pruss_writew(dev, offset, reg_val);
+
+		/* Configuring RX bits per character value */
+		offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL)
+						+ PRU_SUART_CH_CONFIG2_OFFSET;
+		pruss_readw(dev, offset, (u16 *) &reg_val);
+		reg_val = reg_val | (config_uart->rx_bits_per_char <<
+			PRU_SUART_CH_CONFIG1_DIVISOR_SHIFT);
+		pruss_writew(dev, offset, reg_val);
+	}
+	return status;
+}
+
+/*
+ * suart routine for getting the number of bytes transfered
+ */
+s32 pru_softuart_get_tx_data_len(struct device *dev,
+					struct suart_handle *h_uart)
+{
+	u32 offset;
+	u32 pru_offset;
+	u16 ch_num = h_uart->uart_num - 1;
+	u16 read_value = 0;
+
+	if (h_uart == NULL) {
+		WARN_ON(1);
+		return -EINVAL;
+	}
+
+	search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 1);
+
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+						PRU_SUART_CH_CONFIG2_OFFSET;
+	pruss_readw(dev, offset, (u16 *) &read_value);
+	read_value = ((read_value & PRU_SUART_CH_CONFIG1_DIVISOR_MASK)
+					>> PRU_SUART_CH_CONFIG2_DATALEN_SHIFT);
+	return read_value;
+}
+
+/*
+ * suart routine for getting the number of bytes received
+ */
+s32 pru_softuart_get_rx_data_len(struct device *dev,
+					struct suart_handle *h_uart)
+{
+	u32 offset;
+	u32 pru_offset;
+	u16 ch_num = h_uart->uart_num - 1;
+	u16 read_value = 0;
+
+	if (h_uart == NULL) {
+		WARN_ON(1);
+		return -EINVAL;
+	}
+
+	search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 2);
+
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+						PRU_SUART_CH_CONFIG2_OFFSET;
+	pruss_readw(dev, offset, (u16 *) &read_value);
+	read_value = ((read_value & PRU_SUART_CH_CONFIG1_DIVISOR_MASK)
+					>> PRU_SUART_CH_CONFIG2_DATALEN_SHIFT);
+	return read_value;
+}
+
+/*
+ * suart routine to get the configuration information from a specific uart
+ */
+s32 pru_softuart_getconfig(struct device *dev,
+			 struct suart_handle *h_uart,
+			struct suart_config *config_uart)
+{
+	u32 offset;
+	u32 pru_offset;
+	u16 ch_num = h_uart->uart_num - 1;
+	u16 reg_val = 0;
+	s16 status = 0;
+
+	if (h_uart == NULL) {
+		WARN_ON(1);
+		return -EINVAL;
+	}
+
+	/*
+	 * NOTE:
+	 * Dependent baud rate for the given UART,the value MUST BE LESS THAN OR
+	 * EQUAL TO 64, preScalarValue <= 64
+	 */
+	search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 1);
+
+	/* Configuring the Transmit part of the given UART */
+	/* Configuring TX serializer  */
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+						PRU_SUART_CH_CTRL_OFFSET;
+	pruss_readw(dev, offset, (u16 *) &reg_val);
+	config_uart->tx_serializer = ((reg_val & PRU_SUART_CH_CTRL_SR_MASK) >>
+						PRU_SUART_CH_CTRL_SR_SHIFT);
+	/* Configuring TX prescalar value */
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+						PRU_SUART_CH_CONFIG1_OFFSET;
+	pruss_readw(dev, offset, (u16 *) &reg_val);
+	config_uart->tx_clk_divisor = ((reg_val &
+				 PRU_SUART_CH_CONFIG1_DIVISOR_MASK) >>
+					 PRU_SUART_CH_CONFIG1_DIVISOR_SHIFT);
+
+	/* Configuring TX bits per character value */
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+					PRU_SUART_CH_CONFIG2_OFFSET;
+	pruss_readw(dev, offset, (u16 *) &reg_val);
+	config_uart->tx_bits_per_char = ((reg_val &
+				 PRU_SUART_CH_CONFIG1_DIVISOR_MASK) >>
+					PRU_SUART_CH_CONFIG1_DIVISOR_SHIFT);
+
+	if (PRU0_MODE == PRU_MODE_RX_ONLY) {
+		pru_offset = PRU_SUART_PRU0_CH0_OFFSET;
+	} else if (PRU1_MODE == PRU_MODE_RX_ONLY) {
+		pru_offset = PRU_SUART_PRU1_CH0_OFFSET;
+	} else if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH) ||
+				(PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
+		ch_num++;
+	} else {
+		return 0;
+	}
+	/* Configuring the Transmit part of the given UART */
+	/* Configuring RX serializer  */
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+						PRU_SUART_CH_CTRL_OFFSET;
+	pruss_readw(dev, offset, (u16 *) &reg_val);
+	config_uart->rx_serializer = ((reg_val & PRU_SUART_CH_CTRL_SR_MASK) >>
+						PRU_SUART_CH_CTRL_SR_SHIFT);
+
+	/* Configuring RX prescalar value and oversampling */
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+						PRU_SUART_CH_CONFIG1_OFFSET;
+	pruss_readw(dev, offset, (u16 *) &reg_val);
+	config_uart->rx_clk_divisor = ((reg_val &
+					 PRU_SUART_CH_CONFIG1_DIVISOR_MASK)
+					>> PRU_SUART_CH_CONFIG1_DIVISOR_SHIFT);
+	config_uart->oversampling = ((reg_val &
+					 PRU_SUART_CH_CONFIG1_OVS_MASK) >>
+						PRU_SUART_CH_CONFIG1_OVS_SHIFT);
+
+	/* Configuring RX bits per character value */
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+						PRU_SUART_CH_CONFIG2_OFFSET;
+	pruss_readw(dev, offset, (u16 *) &reg_val);
+	config_uart->rx_bits_per_char = ((reg_val &
+					 PRU_SUART_CH_CONFIG1_DIVISOR_MASK)
+					>> PRU_SUART_CH_CONFIG1_DIVISOR_SHIFT);
+
+	return status;
+}
+
+s32 pru_softuart_pending_tx_request(struct device *dev)
+{
+	u32 offset = 0;
+	u32 ISR_value = 0;
+
+	if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH)
+	    || (PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
+		return 0;
+	} else if (PRU0_MODE == PRU_MODE_TX_ONLY) {
+		/* Read PRU Interrupt Status Register from PRU */
+		offset = (u32) (PRUSS_INTC_STATCLRINT1 & 0xFFFF);
+		pruss_readl(dev, offset, (u32 *)&ISR_value);
+		if ((ISR_value & 0x1) == 0x1)
+			return -EINVAL;
+	} else if (PRU1_MODE == PRU_MODE_TX_ONLY) {
+		/* Read PRU Interrupt Status Register from PRU */
+		offset = (u32) (PRUSS_INTC_STATCLRINT1 & 0xFFFF);
+		pruss_readl(dev, offset, (u32 *)&ISR_value);
+		if ((ISR_value & 0x2) == 0x2)
+			return -EINVAL;
+	} else {
+		return 0;
+	}
+
+	return 0;
+}
+
+/*
+ * suart data transmit routine
+ */
+s32 pru_softuart_write(struct device *dev, struct suart_handle *h_uart,
+		u32 *pt_tx_data_buf, u16 data_len)
+{
+	u32 offset = 0;
+	u32 pru_offset;
+	s16 status = 0;
+	u16 ch_num = h_uart->uart_num - 1;
+	u16 reg_val = 0;
+	u16 pru_num;
+
+	if (h_uart == NULL) {
+		WARN_ON(1);
+		return -EINVAL;
+	}
+	search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 1);
+	if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH) ||
+				(PRU1_MODE == PRU_MODE_RX_TX_BOTH))
+		pru_num = h_uart->uart_num;
+	else if (PRU0_MODE == PRU_MODE_TX_ONLY)
+		pru_num = 0;
+	else if (PRU1_MODE == PRU_MODE_TX_ONLY)
+		pru_num = 1;
+	else
+		return 0;
+
+	/* Writing data length to SUART channel register */
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+				PRU_SUART_CH_CONFIG2_OFFSET;
+	pruss_readw(dev, offset, (u16 *) &reg_val);
+	reg_val &= ~PRU_SUART_CH_CONFIG2_DATALEN_MASK;
+	reg_val = reg_val | (data_len << PRU_SUART_CH_CONFIG2_DATALEN_SHIFT);
+	pruss_writew(dev, offset, reg_val);
+
+	/* Writing the data pos32er to channel TX data pointer */
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+				PRU_SUART_CH_TXRXDATA_OFFSET;
+	pruss_writel(dev, offset, (u32) *pt_tx_data_buf);
+
+	/* Service Request to PRU */
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+				PRU_SUART_CH_CTRL_OFFSET;
+	pruss_readw(dev, offset, (u16 *) &reg_val);
+	reg_val &= ~(PRU_SUART_CH_CTRL_MODE_MASK |
+			PRU_SUART_CH_CTRL_SREQ_MASK);
+	reg_val |= (PRU_SUART_CH_CTRL_TX_MODE <<
+		PRU_SUART_CH_CTRL_MODE_SHIFT) | (PRU_SUART_CH_CTRL_SREQ <<
+		PRU_SUART_CH_CTRL_SREQ_SHIFT);
+	pruss_writew(dev, offset, reg_val);
+
+	/* generate ARM->PRU event */
+	suart_arm_to_pru_intr(dev, pru_num);
+
+	return status;
+}
+
+/*
+ * suart data receive routine
+ */
+s32 pru_softuart_read(struct device *dev, struct suart_handle *h_uart,
+		u32 *ptDataBuf, u16 data_len)
+{
+	u32 offset = 0;
+	u32 pru_offset;
+	s16 status = 0;
+	u16 ch_num = h_uart->uart_num - 1;
+	u16 reg_val = 0;
+	u16 pru_num;
+
+	if (h_uart == NULL) {
+		WARN_ON(1);
+		return -EINVAL;
+	}
+	search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 2);
+	if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH) ||
+			 (PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
+		/* channel starts from 0 and uart instance starts from 1 */
+		ch_num = (h_uart->uart_num *
+			SUART_NUM_OF_CHANNELS_PER_SUART) - 2;
+		pru_num = h_uart->uart_num;
+	} else if (PRU0_MODE == PRU_MODE_RX_ONLY) {
+		pru_num = 0;
+	} else if (PRU1_MODE == PRU_MODE_RX_ONLY) {
+		pru_num = 1;
+	} else {
+		return 0;
+	}
+	/* Writing data length to SUART channel register */
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+					PRU_SUART_CH_CONFIG2_OFFSET;
+	pruss_readw(dev, offset, (u16 *) &reg_val);
+	reg_val &= ~PRU_SUART_CH_CONFIG2_DATALEN_MASK;
+	reg_val = reg_val | (data_len << PRU_SUART_CH_CONFIG2_DATALEN_SHIFT);
+	pruss_writew(dev, offset, reg_val);
+
+	/* Writing the data pos32er to channel RX data pointer */
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+		PRU_SUART_CH_TXRXDATA_OFFSET;
+	pruss_writel(dev, offset, (u32) *ptDataBuf);
+
+	/* Service Request to PRU */
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+		PRU_SUART_CH_CTRL_OFFSET;
+	pruss_readw(dev, offset, (u16 *) &reg_val);
+	reg_val &= ~(PRU_SUART_CH_CTRL_MODE_MASK |
+		PRU_SUART_CH_CTRL_SREQ_MASK);
+	reg_val |= (PRU_SUART_CH_CTRL_RX_MODE <<
+		PRU_SUART_CH_CTRL_MODE_SHIFT) | (PRU_SUART_CH_CTRL_SREQ <<
+		PRU_SUART_CH_CTRL_SREQ_SHIFT);
+	pruss_writew(dev, offset, reg_val);
+
+	/* enable the timeout s32errupt */
+	suart_intr_setmask(dev, h_uart->uart_num, PRU_RX_INTR,
+		CHN_TXRX_IE_MASK_TIMEOUT);
+
+	/* generate ARM->PRU event */
+	suart_arm_to_pru_intr(dev, pru_num);
+
+	return status;
+}
+
+/*
+ * suart routine to read the data from the RX FIFO
+ */
+s32 pru_softuart_read_data(struct device *dev, struct suart_handle *h_uart,
+				u8 *p_data_buffer, s32 max_len,
+					u32 *pdata_read)
+{
+	s16 ret_val = 0;
+	u8 *psrc_addr = NULL;
+	u32 data_read = 0;
+	u32 data_len = 0;
+	u32 char_len = 0;
+	u32 offset = 0;
+	u32 pru_offset;
+	u16 ch_num = h_uart->uart_num - 1;
+	u16 status = 0;
+
+	if (h_uart == NULL) {
+		WARN_ON(1);
+		return -EINVAL;
+	}
+	search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 2);
+
+	/* Get the data pos32er from channel RX data pointer */
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+						PRU_SUART_CH_TXRXDATA_OFFSET;
+	pruss_readb_multi(dev, offset, (u8 *) &psrc_addr, 4);
+
+	/* Reading data length from SUART channel register */
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+						PRU_SUART_CH_CONFIG2_OFFSET;
+	pruss_readw(dev, offset, (u16 *) &data_len);
+
+	/* read the character length */
+	char_len = data_len & PRU_SUART_CH_CONFIG2_BITPERCHAR_MASK;
+	char_len -= 2;	/* remove the START & STOP bit */
+
+	data_len &= PRU_SUART_CH_CONFIG2_DATALEN_MASK;
+	data_len = data_len >> PRU_SUART_CH_CONFIG2_DATALEN_SHIFT;
+	data_len++;
+
+	/* if the character length is greater than 8, then the size doubles */
+	if (char_len > 8)
+		data_len *= 2;
+
+	/* Check if the time-out had occured. If, yes, then we need to find the
+	 * number of bytes read from PRU. Else, we need to
+	 * read the requested bytes
+	 */
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+						PRU_SUART_CH_TXRXSTATUS_OFFSET;
+	pruss_readb(dev, offset, (u8 *) &status);
+	if (CHN_TXRX_STATUS_TIMEOUT == (status & CHN_TXRX_STATUS_TIMEOUT)) {
+		/* determine the number of bytes read s32o the FIFO */
+		offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL)
+				 + PRU_SUART_CH_BYTESDONECNTR_OFFSET;
+		pruss_readb(dev, offset, (u8 *) &data_read);
+
+		/* if the character length is greater than 8,
+				then the size doubles */
+		if (char_len > 8)
+			data_read *= 2;
+
+/*
+ * the data corresponding is loaded in second
+ * half during the timeout
+ */
+		if (data_read > data_len) {
+			data_read -= data_len;
+			psrc_addr += data_len;
+		}
+
+		pru_softuart_clr_rx_fifo(dev, h_uart);
+	} else {
+		data_read = data_len;
+/*
+ * if the bit is set, the data is in the first
+ * half of the FIFO else the data is in the second half
+ */
+		/* Determine the buffer index by reading FIFO_OddEven flag*/
+		if (status & CHN_TXRX_STATUS_CMPLT)
+			psrc_addr += data_len;
+	}
+
+	/* we should be copying only max len given by the application */
+	if (data_read > max_len)
+		data_read = max_len;
+
+/* evaluate the virtual address of the FIFO address
+ * based on the physical addr
+ */
+	psrc_addr = (u8 *)((u32) psrc_addr -
+		(u32) suart_iomap.p_fifo_buff_phys_base +
+		(u32) suart_iomap.p_fifo_buff_virt_base);
+
+	/* Now we have both the data length and the source address. copy */
+	for (offset = 0; offset < data_read; offset++)
+		*p_data_buffer++ = *psrc_addr++;
+	*pdata_read = data_read;
+	ret_val = 0;
+
+	return ret_val;
+}
+
+/*
+ * suart routine to disable the receive functionality.
+ * This routine stops the PRU from receiving on selected
+ * UART and also disables the McASP serializer corresponding
+ * to this UART Rx line.
+ */
+s32 pru_softuart_stop_receive(struct device *dev, struct suart_handle *h_uart)
+{
+	u16 ret_status = 0;
+	u32 offset;
+	u32 pru_offset;
+	u16 ch_num = h_uart->uart_num - 1;
+	u16 status;
+
+	if (h_uart == NULL) {
+		WARN_ON(1);
+		return -EINVAL;
+	}
+	search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 2);
+
+	/* read the existing value of status flag */
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+						PRU_SUART_CH_TXRXSTATUS_OFFSET;
+	pruss_readb(dev, offset, (u8 *) &status);
+
+	/* we need to clear the busy bit corresponding to receive channel */
+	status &= ~(CHN_TXRX_STATUS_RDY);
+	pruss_writeb(dev, offset, (u8) status);
+
+	/* get the serizlizer number being used for this Rx channel */
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+						PRU_SUART_CH_CTRL_OFFSET;
+	pruss_readw(dev, offset, (u16 *) &status);
+	status &= PRU_SUART_CH_CTRL_SR_MASK;
+	status = status >> PRU_SUART_CH_CTRL_SR_SHIFT;
+
+	/* we need to de-activate the serializer corresponding to this rx */
+	ret_status = suart_asp_serializer_deactivate(status, &suart_iomap);
+
+	return ret_status;
+}
+
+/*
+ * suart routine to get the tx status for a specific uart
+ */
+s32 pru_softuart_get_tx_status(struct device *dev, struct suart_handle *h_uart)
+{
+	u32 offset;
+	u32 pru_offset;
+	u16 status = 0;
+	u16 ch_num = h_uart->uart_num - 1;
+
+	if (h_uart == NULL) {
+		WARN_ON(1);
+		return -EINVAL;
+	}
+	search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 1);
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+					PRU_SUART_CH_TXRXSTATUS_OFFSET;
+	pruss_readb(dev, offset, (u8 *) &status);
+	return status;
+}
+
+s32 pru_softuart_clr_tx_status(struct device *dev, struct suart_handle *h_uart)
+{
+	u32 offset;
+	u32 pru_offset;
+	u16 status = 0;
+	u16 ch_num = h_uart->uart_num - 1;
+
+	if (h_uart == NULL) {
+		WARN_ON(1);
+		return -EINVAL;
+	}
+	search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 1);
+
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+					PRU_SUART_CH_TXRXSTATUS_OFFSET;
+	pruss_readb(dev, offset, (u8 *) &status);
+	status &= ~(0x2);
+	pruss_writeb(dev, offset, (u8) status);
+	return status;
+}
+
+/*
+ * suart routine to get the rx status for a specific uart
+ */
+s32 pru_softuart_get_rx_status(struct device *dev, struct suart_handle *h_uart)
+{
+	u32 offset;
+	u32 pru_offset;
+	u16 status = 0;
+	u16 ch_num = h_uart->uart_num - 1;
+
+	if (h_uart == NULL) {
+		WARN_ON(1);
+		return -EINVAL;
+	}
+	search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 2);
+
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+				PRU_SUART_CH_TXRXSTATUS_OFFSET;
+	pruss_readb(dev, offset, (u8 *) &status);
+	return status;
+}
+
+static s32 pru_softuart_clr_rx_fifo(struct device *dev,
+				struct suart_handle *h_uart)
+{
+	u32 offset;
+	u32 pru_offset;
+	u16 status = 0;
+	u16 ch_num = h_uart->uart_num - 1;
+	u16 reg_val;
+	u16 uart_num;
+
+	if (h_uart == NULL) {
+		WARN_ON(1);
+		return -EINVAL;
+	}
+	uart_num = h_uart->uart_num;
+	search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 2);
+	if (PRU0_MODE == PRU_MODE_RX_ONLY)
+		uart_num = 0;
+	else if (PRU1_MODE == PRU_MODE_RX_ONLY)
+		uart_num = 1;
+
+	/* Reset the number of bytes read into the FIFO */
+		offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL)
+					+ PRU_SUART_CH_BYTESDONECNTR_OFFSET;
+		pruss_readw(dev, offset, (u16 *) &reg_val);
+	reg_val &= 0x00;
+		pruss_writew(dev, offset, reg_val);
+
+
+	/* Service Request to PRU */
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+						PRU_SUART_CH_CTRL_OFFSET;
+	pruss_readw(dev, offset, (u16 *) &reg_val);
+	reg_val &= ~(PRU_SUART_CH_CTRL_MODE_MASK | PRU_SUART_CH_CTRL_SREQ_MASK);
+	reg_val |= (PRU_SUART_CH_CTRL_RX_MODE << PRU_SUART_CH_CTRL_MODE_SHIFT) |
+		(PRU_SUART_CH_CTRL_SREQ << PRU_SUART_CH_CTRL_SREQ_SHIFT);
+	pruss_writew(dev, offset, reg_val);
+	suart_intr_setmask(dev, h_uart->uart_num, PRU_RX_INTR,
+						CHN_TXRX_IE_MASK_TIMEOUT);
+
+	/* generate ARM->PRU event */
+	suart_arm_to_pru_intr(dev, uart_num);
+
+	return status;
+}
+
+s32 pru_softuart_clr_rx_status(struct device *dev, struct suart_handle *h_uart)
+{
+	u32 offset;
+	u32 pru_offset;
+	u16 status = 0;
+	u16 ch_num = h_uart->uart_num - 1;
+
+	if (h_uart == NULL) {
+		WARN_ON(1);
+		return -EINVAL;
+	}
+	search_chnum(h_uart->uart_num, &ch_num, &pru_offset, 2);
+
+	offset = pru_offset + (ch_num * SUART_NUM_OF_BYTES_PER_CHANNEL) +
+			PRU_SUART_CH_TXRXSTATUS_OFFSET;
+	pruss_readb(dev, offset, (u8 *) &status);
+	status &= ~(0x3C);
+	pruss_writeb(dev, offset, (u8) status);
+	return status;
+}
+
+/*
+ * suart_s32r_status_read: Gets the Global Interrupt status register
+ * for the specified SUART.
+ * uart_num < 1 to 6 >
+ * txrx_flag < Indicates TX or RX s32errupt for the uart >
+ */
+s32 pru_softuart_get_isrstatus(struct device *dev, u16 uart_num, u16 *txrx_flag)
+{
+	u32 intc_offset;
+	u32 ch_num = 0xFF;
+	u32 reg_val = 0;
+	u32 reg_val2 = 0;
+	u32 ISR_value = 0;
+	u32 ack_reg_val = 0;
+	u32 stat_inx_clr_regoffset = 0;
+
+	/* initialize the status & Flag to known value */
+	*txrx_flag = 0;
+
+	stat_inx_clr_regoffset = (u32) (PRUSS_INTC_STATIDXCLR & 0xFFFF);
+
+	/* Read PRU Interrupt Status Register from PRU */
+	intc_offset = (u32) (PRUSS_INTC_STATCLRINT1 & 0xFFFF);
+
+	pruss_readl(dev, intc_offset, (u32 *)&ISR_value);
+	if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH)
+		|| (PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
+		/* Check if the interrupt occured for Tx */
+		ch_num = uart_num * 2 - 2;
+		reg_val2 = PRU_SUART0_TX_EVT_BIT << ((uart_num - 1) * 2);
+		if (ISR_value & reg_val2) {
+			/* interupt occured for TX */
+			*txrx_flag |= PRU_TX_INTR;
+			/* acknowledge the RX interrupt  */
+			ack_reg_val  = ch_num + PRU_SUART0_TX_EVT;
+			pruss_writel(dev, stat_inx_clr_regoffset,
+					ack_reg_val);
+		}
+
+		/* Check if the interrupt occured for Rx */
+		reg_val2 = PRU_SUART0_RX_EVT_BIT << ((uart_num - 1) * 2);
+		pruss_readl(dev, intc_offset, (u32 *)&ISR_value);
+		if (ISR_value & reg_val2) {
+			/* interupt occured for RX */
+			*txrx_flag |= PRU_RX_INTR;
+			ch_num += 1;
+
+			/* acknowledge the RX interrupt  */
+			ack_reg_val  = ch_num + PRU_SUART0_TX_EVT;
+			pruss_writel(dev, stat_inx_clr_regoffset,
+						ack_reg_val);
+		}
+	} else {
+		ch_num = uart_num - 1;
+		if ((ISR_value & 0x03FC) != 0) {
+			reg_val2 = 1 << (uart_num + 1);
+			if (ISR_value & reg_val2) {
+				/* acknowledge the s32errupt  */
+				ack_reg_val = ch_num + PRU_SUART0_TX_EVT;
+				pruss_writel(dev, stat_inx_clr_regoffset,
+					ack_reg_val);
+				*txrx_flag |= PRU_RX_INTR;
+			}
+		}
+		pruss_readl(dev, intc_offset, (u32 *)&ISR_value);
+		if (ISR_value & 0x3FC00) {
+			reg_val2 = 1 << (uart_num + 9);
+			if (ISR_value & reg_val2) {
+				/* acknowledge the s32errupt  */
+				ack_reg_val = ch_num + PRU_SUART4_TX_EVT;
+				pruss_writel(dev, stat_inx_clr_regoffset,
+					ack_reg_val);
+				*txrx_flag |= PRU_TX_INTR;
+			}
+		}
+	}
+	return reg_val;
+}
+
+s32 pru_intr_clr_isrstatus(struct device *dev, u16 uart_num, u32 txrxmode)
+{
+	u32 offset;
+	u16 txrx_flag = 0;
+	u16 chn_num;
+
+	chn_num = uart_num - 1;
+	if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH)
+	    || (PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
+		/* channel starts from 0 and uart instance starts from 1 */
+		chn_num = (uart_num * SUART_NUM_OF_CHANNELS_PER_SUART) - 2;
+		if (uart_num <= 4) {
+			/* PRU0 */
+			offset = PRU_SUART_PRU0_ISR_OFFSET + 1;
+		} else {
+			/* PRU1 */
+			offset = PRU_SUART_PRU1_ISR_OFFSET + 1;
+			/* First 8 channel corresponds to PRU0 */
+			chn_num -= 8;
+		}
+		if (2 == txrxmode)
+			chn_num++;
+	} else if (PRU0_MODE == txrxmode) {
+		offset = PRU_SUART_PRU0_ISR_OFFSET + 1;
+	} else if (PRU1_MODE == txrxmode) {
+		offset = PRU_SUART_PRU1_ISR_OFFSET + 1;
+	} else {
+		return 0;
+	}
+
+	pruss_readb(dev, offset, (u8 *) &txrx_flag);
+	txrx_flag &= ~(0x2);
+	pruss_writeb(dev, offset, (u8) txrx_flag);
+
+	return 0;
+}
+
+s32 suart_arm_to_pru_intr(struct device *dev, u16 uart_num)
+{
+	u32 value;
+
+	if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH)
+	    || (PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
+		if ((uart_num > 0) && (uart_num <= 4))
+			value = 0x20; /* PRU0 SYS_EVT32 */
+		else if ((uart_num > 4) && (uart_num <= 8))
+			value = 0x21; /* PRU0 SYS_EVT33 */
+		else
+			return -EINVAL;
+	}
+	if ((PRU0_MODE == PRU_MODE_RX_ONLY)
+				|| (PRU1_MODE == PRU_MODE_RX_ONLY)
+				|| (PRU0_MODE == PRU_MODE_TX_ONLY)
+				|| (PRU1_MODE == PRU_MODE_TX_ONLY)) {
+		if (uart_num == PRUSS_NUM0)
+			value = 0x20; /* PRU0 SYS_EVT32 */
+		else if (uart_num == PRUSS_NUM1)
+			value = 0x21; /* PRU0 SYS_EVT33 */
+		else
+			return -EINVAL;
+	}
+	return pruss_writel(dev, PRUSS_INTC_STATIDXSET, value);
+}
+
+static s32 arm_to_pru_intr_init(struct device *dev)
+{
+	u32 value;
+	u32 int_offset;
+
+	/* Clear all the host interrupts */
+	for (int_offset = 0; int_offset <= PRUSS_INTC_HOSTINTLVL_MAX;
+							int_offset++)
+		pruss_idx_writel(dev, PRUSS_INTC_HSTINTENIDXCLR, int_offset);
+
+	/* Enable the global s32errupt */
+	pruss_rmwl(dev, (u32) (PRUSS_INTC_GLBLEN & 0xFFFF), 0, 1);
+
+	/* Enable the Host interrupts for all host channels */
+	for (int_offset = 0; int_offset <= PRUSS_INTC_HOSTINTLVL_MAX;
+							 int_offset++)
+		pruss_rmwl(dev, (u32) (PRUSS_INTC_HSTINTENIDXSET & 0xFFFF),
+								0, int_offset);
+	pruss_rmwl(dev, (u32) (PRUSS_INTC_HOSTMAP0 & 0xFFFF),
+				PRU_INTC_REGMAP_MASK, PRU_INTC_HOSTMAP0_CHAN);
+	pruss_rmwl(dev, (u32) (PRUSS_INTC_HOSTMAP1 & 0xFFFF),
+				PRU_INTC_REGMAP_MASK, PRU_INTC_HOSTMAP1_CHAN);
+	pruss_rmwl(dev, (u32) (PRUSS_INTC_HOSTMAP2 & 0xFFFF),
+				PRU_INTC_REGMAP_MASK, PRU_INTC_HOSTMAP2_CHAN);
+
+	 /* MAP Channel 0 to SYS_EVT31 */
+	pruss_rmwl(dev, (u32) (PRUSS_INTC_CHANMAP7 & 0xFFFF),
+			PRU_INTC_REGMAP_MASK, PRU_INTC_CHANMAP7_SYS_EVT31);
+
+	if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH)
+	    || (PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
+		/* Sets the channels for the system interrupt */
+		pruss_rmwl(dev, (u32) (PRUSS_INTC_CHANMAP8 & 0xFFFF),
+				PRU_INTC_REGMAP_MASK, PRU_INTC_CHANMAP8_FULL);
+		pruss_rmwl(dev, (u32) (PRUSS_INTC_CHANMAP9 & 0xFFFF),
+				PRU_INTC_REGMAP_MASK, PRU_INTC_CHANMAP9_FULL);
+		pruss_rmwl(dev, (u32) (PRUSS_INTC_CHANMAP10 & 0xFFFF),
+				PRU_INTC_REGMAP_MASK, PRU_INTC_CHANMAP10_FULL);
+		pruss_rmwl(dev, (u32) (PRUSS_INTC_CHANMAP11 & 0xFFFF),
+				PRU_INTC_REGMAP_MASK, PRU_INTC_CHANMAP11_FULL);
+		pruss_rmwl(dev, (u32) (PRUSS_INTC_CHANMAP12 & 0xFFFF),
+				PRU_INTC_REGMAP_MASK, PRU_INTC_CHANMAP12_FULL);
+	}
+	if ((PRU0_MODE == PRU_MODE_RX_ONLY)
+			|| (PRU1_MODE == PRU_MODE_RX_ONLY)
+			|| (PRU0_MODE == PRU_MODE_TX_ONLY)
+			|| (PRU1_MODE == PRU_MODE_TX_ONLY)) {
+
+		/* Sets the channels for the system interrupt */
+		pruss_rmwl(dev, (u32) (PRUSS_INTC_CHANMAP8 & 0xFFFF),
+				PRU_INTC_REGMAP_MASK, PRU_INTC_CHANMAP8_HALF);
+		pruss_rmwl(dev, (u32) (PRUSS_INTC_CHANMAP9 & 0xFFFF),
+				PRU_INTC_REGMAP_MASK, PRU_INTC_CHANMAP9_HALF);
+		pruss_rmwl(dev, (u32) (PRUSS_INTC_CHANMAP10 & 0xFFFF),
+				PRU_INTC_REGMAP_MASK, PRU_INTC_CHANMAP10_HALF);
+		pruss_rmwl(dev, (u32) (PRUSS_INTC_CHANMAP11 & 0xFFFF),
+				PRU_INTC_REGMAP_MASK, PRU_INTC_CHANMAP11_HALF);
+		pruss_rmwl(dev, (u32) (PRUSS_INTC_CHANMAP12 & 0xFFFF),
+				PRU_INTC_REGMAP_MASK, PRU_INTC_CHANMAP12_HALF);
+	}
+
+	/* Clear required set of system events
+	* and enable them using indexed register
+	*/
+	for (int_offset = 0; int_offset < 18; int_offset++) {
+		value = 32 + int_offset;
+		pruss_idx_writel(dev, PRUSS_INTC_STATIDXCLR, value);
+	}
+
+	/* enable only the HOST to PRU interrupts and let the PRU to Host events
+	 * enabled by the separate API on demand basis.
+	 */
+	pruss_idx_writel(dev, PRUSS_INTC_ENIDXSET, 31);
+	pruss_idx_writel(dev, PRUSS_INTC_ENIDXSET, 32);
+	pruss_idx_writel(dev, PRUSS_INTC_ENIDXSET, 33);
+	pruss_idx_writel(dev, PRUSS_INTC_ENIDXSET, 50);
+	pruss_rmwl(dev, (u32) (PRUSS_INTC_GLBLEN & 0xFFFF), 0, 1);
+
+	/* Enable the Host interrupts for all host channels */
+	for (int_offset = 0; int_offset <= PRUSS_INTC_HOSTINTLVL_MAX;
+							int_offset++)
+		pruss_idx_writel(dev, PRUSS_INTC_HSTINTENIDXSET, int_offset);
+
+	return 0;
+}
+
+s32 suart_pru_to_host_intr_enable(struct device *dev, u16 uart_num,
+		u32 txrxmode, s32 flag)
+{
+	u32 chn_num;
+	u32 value;
+	s16 retval = 0;
+
+	if (uart_num > 8)
+		return -EINVAL;
+
+	chn_num = uart_num - 1;
+	if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH) ||
+		(PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
+		chn_num = (uart_num * 2) - 2;
+		if (2 == txrxmode)	/* Rx mode */
+			chn_num++;
+		value = 34 + chn_num;
+	} else if ((PRU_MODE_RX_ONLY == txrxmode)
+		&& (PRU0_MODE == PRU_MODE_RX_ONLY))
+		value = 34 + chn_num;
+	else if ((PRU_MODE_RX_ONLY == txrxmode)
+		&& (PRU1_MODE == PRU_MODE_RX_ONLY))
+		value = 42 + chn_num;
+	else if ((PRU_MODE_TX_ONLY == txrxmode)
+		&& (PRU0_MODE == PRU_MODE_TX_ONLY))
+		value = 34 + chn_num;
+	else if ((PRU_MODE_TX_ONLY == txrxmode)
+		&& (PRU1_MODE == PRU_MODE_TX_ONLY))
+		value = 42 + chn_num;
+	else
+		return -EINVAL;
+
+	retval = flag ? pruss_idx_writel(dev, PRUSS_INTC_ENIDXSET, value) :
+			pruss_idx_writel(dev, PRUSS_INTC_ENIDXCLR, value);
+	return retval;
+}
+
+s32 suart_intr_setmask(struct device *dev, u16 uart_num,
+		u32 txrxmode, u32 rmask)
+{
+	u32 offset;
+	u32 pru_offset;
+	u32 regval = 0;
+	u32 chn_num = uart_num - 1;
+
+	if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH)
+	    || (PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
+		/* channel starts from 0 and uart instance starts from 1 */
+		chn_num = (uart_num * SUART_NUM_OF_CHANNELS_PER_SUART) - 2;
+
+		if ((uart_num > 0) && (uart_num <= 4)) {
+			pru_offset = PRU_SUART_PRU0_CH0_OFFSET;
+			offset = PRU_SUART_PRU0_IMR_OFFSET;
+		} else if ((uart_num > 4) && (uart_num <= 8)) {
+			offset = PRU_SUART_PRU1_IMR_OFFSET;
+			pru_offset = PRU_SUART_PRU1_CH0_OFFSET;
+			chn_num -= 8;
+		} else {
+			return -EINVAL;
+		}
+		if (2 == txrxmode)
+			chn_num++;
+	} else if (PRU0_MODE == txrxmode) {
+		pru_offset = PRU_SUART_PRU0_CH0_OFFSET;
+		offset = PRU_SUART_PRU0_IMR_OFFSET;
+	} else if (PRU1_MODE == txrxmode) {
+		pru_offset = PRU_SUART_PRU1_CH0_OFFSET;
+		offset = PRU_SUART_PRU1_IMR_OFFSET;
+	} else
+		return 0;
+
+	regval = 1 << chn_num;
+	if (CHN_TXRX_IE_MASK_CMPLT == (rmask & CHN_TXRX_IE_MASK_CMPLT))
+		pruss_rmww(dev, offset, regval, regval);
+
+	if ((rmask & SUART_GBL_INTR_ERR_MASK) ==
+			SUART_GBL_INTR_ERR_MASK) {
+		regval = SUART_GBL_INTR_ERR_MASK;
+		pruss_rmww(dev, offset, regval, regval);
+	}
+
+	offset = pru_offset +
+		(chn_num * SUART_NUM_OF_BYTES_PER_CHANNEL)
+				+ PRU_SUART_CH_CONFIG1_OFFSET;
+	/* Framing Error Interrupt Masked */
+	if ((rmask & CHN_TXRX_IE_MASK_FE) == CHN_TXRX_IE_MASK_FE) {
+		regval = 0;
+		pruss_readw(dev, offset, (u16 *) &regval);
+		regval &= ~(CHN_TXRX_IE_MASK_FE);
+		regval |= CHN_TXRX_IE_MASK_FE;
+		pruss_writew(dev, offset, (u16) regval);
+	}
+
+	/* Break Indicator Interrupt Masked */
+	if (CHN_TXRX_IE_MASK_BI == (rmask & CHN_TXRX_IE_MASK_BI)) {
+		regval = 0;
+		pruss_readw(dev, offset, (u16 *) &regval);
+		regval &= ~(CHN_TXRX_IE_MASK_BI);
+		regval |= CHN_TXRX_IE_MASK_BI;
+		pruss_writew(dev, offset, (u16) regval);
+	}
+
+	/* Timeout error Interrupt Masked */
+	if (CHN_TXRX_IE_MASK_TIMEOUT ==
+			(rmask & CHN_TXRX_IE_MASK_TIMEOUT)) {
+		regval = 0;
+		pruss_readw(dev, offset, (u16 *) &regval);
+		regval &= ~(CHN_TXRX_IE_MASK_TIMEOUT);
+		regval |= CHN_TXRX_IE_MASK_TIMEOUT;
+		pruss_writew(dev, offset, (u16) regval);
+	}
+	return 0;
+}
+
+s32 suart_intr_clrmask(struct device *dev, u16 uart_num,
+		u32 txrxmode, u32 rmask)
+{
+	u32 offset;
+	u32 pru_offset;
+	u16 regval = 0;
+	u16 chn_num;
+
+	chn_num = uart_num - 1;
+	if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH)
+	    || (PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
+		/* channel starts from 0 and uart instance starts from 1 */
+		chn_num = (uart_num * SUART_NUM_OF_CHANNELS_PER_SUART) - 2;
+		if ((uart_num > 0) && (uart_num <= 4)) {
+			pru_offset = PRU_SUART_PRU0_CH0_OFFSET;
+			offset = PRU_SUART_PRU0_IMR_OFFSET;
+		} else if ((uart_num > 4) && (uart_num <= 8)) {
+			/* PRU1 */
+			offset = PRU_SUART_PRU1_IMR_OFFSET;
+			pru_offset = PRU_SUART_PRU1_CH0_OFFSET;
+			/* First 8 channel corresponds to PRU0 */
+			chn_num -= 8;
+		} else
+			return -EINVAL;
+		if (2 == txrxmode)
+			chn_num++;
+	} else if (PRU0_MODE == txrxmode) {
+		pru_offset = PRU_SUART_PRU0_CH0_OFFSET;
+		offset = PRU_SUART_PRU0_IMR_OFFSET;
+	} else if (PRU1_MODE == txrxmode) {
+		pru_offset = PRU_SUART_PRU1_CH0_OFFSET;
+		offset = PRU_SUART_PRU1_IMR_OFFSET;
+	} else
+		return 0;
+
+	regval = 1 << chn_num;
+	if (CHN_TXRX_IE_MASK_CMPLT == (rmask & CHN_TXRX_IE_MASK_CMPLT))
+		pruss_rmww(dev, offset, regval, 0);
+
+	if ((rmask & SUART_GBL_INTR_ERR_MASK) == SUART_GBL_INTR_ERR_MASK)
+		pruss_rmww(dev, offset, SUART_GBL_INTR_ERR_MASK, 0);
+
+	offset = pru_offset +
+		(chn_num * SUART_NUM_OF_BYTES_PER_CHANNEL)
+				+ PRU_SUART_CH_CONFIG1_OFFSET;
+
+	/* Framing Error Interrupt Masked */
+	if ((rmask & CHN_TXRX_IE_MASK_FE) == CHN_TXRX_IE_MASK_FE) {
+		regval = 0;
+		pruss_readw(dev, offset, (u16 *) &regval);
+		regval &= ~(CHN_TXRX_IE_MASK_FE);
+		pruss_writew(dev, offset, regval);
+	}
+
+	/* Break Indicator Interrupt Masked */
+	if (CHN_TXRX_IE_MASK_BI == (rmask & CHN_TXRX_IE_MASK_BI)) {
+		regval = 0;
+		pruss_readw(dev, offset, (u16 *) &regval);
+		regval &= ~(CHN_TXRX_IE_MASK_BI);
+		pruss_writew(dev, offset, regval);
+	}
+
+	/* Timeout error Interrupt Masked */
+	if (CHN_TXRX_IE_MASK_TIMEOUT ==
+			(rmask & CHN_TXRX_IE_MASK_TIMEOUT)) {
+		regval = 0;
+		pruss_readw(dev, offset, (u16 *) &regval);
+		regval &= ~(CHN_TXRX_IE_MASK_TIMEOUT);
+		pruss_writew(dev, offset, regval);
+	}
+	return 0;
+}
+
+s32 suart_intr_getmask(struct device *dev, u16 uart_num,
+				u32 txrxmode, u32 rmask)
+{
+	u16 chn_num;
+	u32 offset;
+	u16 txrx_flag;
+	u16 regval = 1;
+
+	chn_num = uart_num - 1;
+	if ((PRU0_MODE == PRU_MODE_RX_TX_BOTH)
+	    || (PRU1_MODE == PRU_MODE_RX_TX_BOTH)) {
+		/* channel starts from 0 and uart instance starts from 1 */
+		chn_num = (uart_num * SUART_NUM_OF_CHANNELS_PER_SUART) - 2;
+
+		if ((uart_num > 0) && (uart_num <= 4)) {
+
+			offset = PRU_SUART_PRU0_IMR_OFFSET;
+		} else if ((uart_num > 4) && (uart_num <= 8)) {
+			/* PRU1 */
+			offset = PRU_SUART_PRU1_IMR_OFFSET;
+			/* First 8 channel corresponds to PRU0 */
+			chn_num -= 8;
+		} else
+			return -EINVAL;
+
+		if (2 == txrxmode)
+			chn_num++;
+
+	} else if (PRU0_MODE == txrxmode)
+		offset = PRU_SUART_PRU0_IMR_OFFSET;
+	else if (PRU1_MODE == txrxmode)
+		offset = PRU_SUART_PRU1_IMR_OFFSET;
+	else
+		return 0;
+
+	regval = regval << chn_num;
+	pruss_readw(dev, offset, (u16 *) &txrx_flag);
+	txrx_flag &= regval;
+
+	if ((rmask && (txrx_flag == regval)) || (!rmask && !txrx_flag))
+		return 1;
+
+	return 0;
+}
diff --git a/drivers/tty/serial/pruss_suart_utils.c b/drivers/tty/serial/pruss_suart_utils.c
new file mode 100644
index 0000000..5ee340e
--- /dev/null
+++ b/drivers/tty/serial/pruss_suart_utils.c
@@ -0,0 +1,393 @@
+/*
+ * Copyright (C) 2010, 2011 Texas Instruments Incorporated
+ * Author: Jitendra Kumar <jitendra@mistralsolutions.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as  published by the
+ * Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
+ * whether express or implied; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ */
+
+
+#include <linux/mfd/pruss.h>
+#include "pruss_suart.h"
+
+#define SUART_TRX_DIV_CONF_SZ	4
+
+static s16 suart_mcasp_tx_baud_set(u32 tx_baud_value,
+			struct pruss_suart_iomap *pruss_ioaddr);
+static s16 suart_mcasp_rx_baud_set(u32 rx_baud_value, u32 oversampling,
+			struct pruss_suart_iomap *pruss_ioaddr);
+
+/*
+ * Lookup table for TX baud rate
+ * The divisor value is calculated using the formula
+ *
+ * ACLKX = (AUXCLK)/(CLKXDIV * HCLKXDIV)
+ *
+ * Where
+ *		CLKXDIV takes values from 1-32
+ *		HCLKXDIV takes values from 1-4096
+ * Here
+ *		AUXCLK = 24MHz
+ */
+static u32 lt_tx_baud_rate[][SUART_TRX_DIV_CONF_SZ] = {
+	/*BaudRate,	Divisor,	CLKXDIV,HCLKXDIV */
+	{300,		80000,		24,		3200},
+	{600,		40000,		15,		2500},
+	{1800,		13333,		10,		1212},
+	{2400,		10000,		4,		2000},
+	{4800,		5000,		1,		2500},
+	{7200,		3333,		0,		3333},
+	{9600,		2500,		0,		2500},
+	{14400,		1666,		0,		1666},
+	{19200,		1250,		0,		1250},
+	{38400,		625,		0,		625},
+	{57600,		416,		0,		416},
+	{115200,	208,		0,		208},
+	{230400,	104,		0,		104}
+};
+
+/*
+ * Lookup table for RX baud rate for 8 bit oversampling
+ * The divisor value is calculated using the formula
+ *
+ *	ACLKR = (AUXCLK)/(CLKRDIV * HCLKRDIV) * Oversampling
+ *
+ * Where
+ *		CLKRDIV takes values from 1-32
+ *		HCLKRDIV takes values from 1-4096
+ * Here
+ *		AUXCLK = 24MHz
+ */
+static u32 lt_rx_8x_baud_rate[][SUART_TRX_DIV_CONF_SZ] = {
+/* BaudRate,	Divisor,	CLKXDIV,	HCLKXDIV */
+	{300,		10000,		4,		2000},
+	{600,		5000,		1,		2500},
+	{1800,		1667,		0,		1667},
+	{2400,		1250,		0,		1250},
+	{7200,		417,		0,		417},
+	{4800,		625,		0,		625},
+	{9600,		312,		0,		312},
+	{14400,		208,		0,		208},
+	{19200,		156,		0,		156},
+	{38400,		78,		0,		78},
+	{57600,		52,		0,		52},
+	{115200,	26,		0,		26},
+	{230400,	13,		0,		13}
+};
+
+/*
+ * Lookup table for RX baud rate for 16 bit oversampling
+ * The divisor value is calculated using the formula
+ *
+ *	ACLKR = (AUXCLK)/(CLKRDIV * HCLKRDIV) * Oversampling
+ *
+ * Where
+ *		CLKRDIV takes values from 1-32
+ *		HCLKRDIV takes values from 1-4096
+ * Here
+ *		AUXCLK = 24MHz
+ */
+static u32 lt_rx_16x_baud_rate[][SUART_TRX_DIV_CONF_SZ] = {
+/*BaudRate,	Divisor,	CLKXDIV,	HCLKXDIV */
+	{300,		5000,		1,		2500},
+	{600,		2500,		0,		2500},
+	{1800,		833,		0,		833},
+	{2400,		625,		0,		625},
+	{4800,		312,		0,		312},
+	{7200,		208,		0,		208},
+	{9600,		156,		0,		156},
+	{14400,		104,		0,		104},
+	{19200,		78,		0,		78},
+	{38400,		39,		0,		39},
+	{57600,		26,		0,		26},
+	{115200,	13,		0,		13},
+	{230400,	6,		0,		6}
+};
+
+/*
+ * McASP configuration routine
+ */
+
+void suart_mcasp_reset(struct pruss_suart_iomap *pruss_ioaddr)
+{
+	struct omapl_mcasp_regs_ovly __iomem *mcasp0_regs =
+					pruss_ioaddr->mcasp_io_addr;
+	/* reset mcasp. */
+	iowrite32(MCASP_SUART_GBLCTL, &mcasp0_regs->gblctl);
+	iowrite32(MCASP_SUART_RGBLCTL, &mcasp0_regs->rgblctl);
+	iowrite32(MCASP_SUART_XGBLCTL, &mcasp0_regs->xgblctl);
+	iowrite32(MCASP_SUART_XSTAT, &mcasp0_regs->xstat);
+	iowrite32(MCASP_SUART_RSTAT, &mcasp0_regs->rstat);
+}
+
+void suart_mcasp_config(u32 tx_baud_value,
+			u32 rx_baud_value,
+			u32 oversampling,
+			struct pruss_suart_iomap *pruss_ioaddr)
+{
+	struct omapl_mcasp_regs_ovly __iomem *mcasp0_regs =
+					pruss_ioaddr->mcasp_io_addr;
+	u32 temp_reg;
+
+	/* reset mcasp */
+	iowrite32(MCASP_SUART_GBLCTL, &mcasp0_regs->gblctl);
+	iowrite32(MCASP_SUART_RGBLCTL, &mcasp0_regs->rgblctl);
+	iowrite32(MCASP_SUART_XGBLCTL, &mcasp0_regs->xgblctl);
+
+	/* configure receive registers */
+	if ((SUART_8X_OVRSMPL == oversampling) || (0 == oversampling)) {
+		iowrite32(MCASP_SUART_RMASK_8, &mcasp0_regs->rmask);
+		iowrite32(MCASP_SUART_RFMT_8, &mcasp0_regs->rfmt);
+	}
+	if (SUART_16X_OVRSMPL == oversampling) {
+		iowrite32(MCASP_SUART_RMASK_16, &mcasp0_regs->rmask);
+		iowrite32(MCASP_SUART_RFMT_16, &mcasp0_regs->rfmt);
+
+	}
+
+	iowrite32(MCASP_SUART_FSRM, &mcasp0_regs->afsrctl);
+	iowrite32(MCASP_SUART_CLKRM_CLKRP, &mcasp0_regs->aclkrctl);
+	iowrite32(MCASP_SUART_HCLKRP, &mcasp0_regs->ahclkrctl);
+	suart_mcasp_rx_baud_set(rx_baud_value, oversampling, pruss_ioaddr);
+	iowrite32(MCASP_SUART_RTDMS0, &mcasp0_regs->rtdm);
+	iowrite32(MCASP_SUART_RSYNCERR, &mcasp0_regs->rintctl);
+	iowrite32(MCASP_SUART_RMAX_RPS_256, &mcasp0_regs->rclkchk);
+
+	/* configure transmit registers. */
+	iowrite32(MCASP_SUART_XMASK_0_31, &mcasp0_regs->xmask);
+	iowrite32(MCASP_SUART_XBUSEL_XSSZ_16_XPAD_0, &mcasp0_regs->xfmt);
+	iowrite32(MCASP_SUART_FSXM, &mcasp0_regs->afsxctl);
+	iowrite32(MCASP_SUART_CLKXM_ASYNC_CLKXP, &mcasp0_regs->aclkxctl);
+	iowrite32(MCASP_SUART_HCLKXM, &mcasp0_regs->ahclkxctl);
+
+	suart_mcasp_tx_baud_set(tx_baud_value, pruss_ioaddr);
+	iowrite32(MCASP_SUART_XTDMS0, &mcasp0_regs->xtdm);
+	iowrite32(MCASP_SUART_XSYNCERR, &mcasp0_regs->xintctl);
+	iowrite32(MCASP_SUART_XMAX_XPS_256, &mcasp0_regs->xclkchk);
+
+	/* Serializer as a transmitter */
+	iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl0);
+	iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl1);
+	iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl2);
+	iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl3);
+	iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl4);
+	iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl5);
+	iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl6);
+	iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl7);
+	iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl8);
+	iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl9);
+	iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl10);
+	iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl11);
+	iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl12);
+	iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl13);
+	iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl14);
+	iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl15);
+
+	/* Configure all AXR[n] as McASP pins  */
+
+	/*
+	 *  Setting  all TX MCASP AXR[n] Pin mapped to Even Serializer number
+	 *  (0,2,4,6,8,10,12,14) to GPIO Mode by default. During setting the
+	 *  serializer to TX mode in PRU assembly code, the MCASP AXR[n] Pin
+	 *  would get configured to MCASP mode of operation,
+	 *  before Actual Data Transfer
+	 */
+
+	/* Setting  all TX Pin to GPIO Mode by default */
+	temp_reg = (OMAPL_MCASP_PFUNC_RESETVAL) |
+	    (1 << PRU_SUART0_CONFIG_TX_SER) | (1 << PRU_SUART1_CONFIG_TX_SER) |
+	    (1 << PRU_SUART2_CONFIG_TX_SER) | (1 << PRU_SUART3_CONFIG_TX_SER) |
+	    (1 << PRU_SUART4_CONFIG_TX_SER) | (1 << PRU_SUART5_CONFIG_TX_SER) |
+	    (1 << PRU_SUART6_CONFIG_TX_SER) | (1 << PRU_SUART7_CONFIG_TX_SER);
+	iowrite32(temp_reg, &mcasp0_regs->pfunc);
+
+	iowrite32(0xFFF, &mcasp0_regs->pdout);
+
+	/* config pin function and direction */
+	iowrite32(0x00000000, &mcasp0_regs->pdir);
+	temp_reg =
+	    (1 << PRU_SUART0_CONFIG_TX_SER) | (1 << PRU_SUART1_CONFIG_TX_SER) |
+	    (1 << PRU_SUART2_CONFIG_TX_SER) | (1 << PRU_SUART3_CONFIG_TX_SER) |
+	    (1 << PRU_SUART4_CONFIG_TX_SER) | (1 << PRU_SUART5_CONFIG_TX_SER) |
+	    (1 << PRU_SUART6_CONFIG_TX_SER) | (1 << PRU_SUART7_CONFIG_TX_SER) |
+	    (MCASP_PDIR_VAL);
+	iowrite32(temp_reg, &mcasp0_regs->pdir);
+
+	iowrite32(MCASP_SUART_DIT_DISABLE, &mcasp0_regs->ditctl);
+	iowrite32(MCASP_SUART_LOOPBACK_DISABLE, &mcasp0_regs->dlbctl);
+	iowrite32(MCASP_SUART_AMUTE_DISABLE, &mcasp0_regs->amute);
+
+	iowrite32(MCASP_SUART_XSTAT, &mcasp0_regs->xstat);
+	iowrite32(MCASP_SUART_RSTAT, &mcasp0_regs->rstat);
+}
+
+void suart_mcasp_tx_serialzier_set(u32 serializer_num,
+		struct pruss_suart_iomap *pruss_ioaddr)
+{
+	struct omapl_mcasp_regs_ovly __iomem *mcasp0_regs =
+					pruss_ioaddr->mcasp_io_addr;
+	u32 temp_reg;
+	temp_reg = ioread32(&mcasp0_regs->pfunc);
+	temp_reg |= (0x1 << serializer_num);
+	iowrite32(temp_reg, &mcasp0_regs->pfunc);
+}
+
+/*
+ * mcasp TX buard rate setting routine
+ */
+static s16 suart_mcasp_tx_baud_set(u32 tx_baud_value,
+		struct pruss_suart_iomap *pruss_ioaddr)
+{
+	u32 clk_div_val;
+	u32 loop_cnt;
+	s16 status = 0;
+	s16 found_val = false;
+
+	struct omapl_mcasp_regs_ovly __iomem *mcasp0_regs =
+					pruss_ioaddr->mcasp_io_addr;
+	u32 temp_reg;
+
+	/* Search the supported baud rate in the table */
+	for (loop_cnt = 0; loop_cnt < SUART_NUM_OF_BAUDS_SUPPORTED;
+							loop_cnt++) {
+		if (tx_baud_value == lt_tx_baud_rate[loop_cnt][0]) {
+			found_val = true;
+			break;
+		}
+	}
+	if (found_val == true) {
+		clk_div_val = lt_tx_baud_rate[loop_cnt][2];
+		temp_reg = ioread32(&mcasp0_regs->aclkxctl);
+		temp_reg |= (clk_div_val <<
+					OMAPL_MCASP_ACLKXCTL_CLKXDIV_SHIFT);
+		iowrite32(temp_reg, &mcasp0_regs->aclkxctl);
+		clk_div_val = lt_tx_baud_rate[loop_cnt][3];
+		temp_reg = ioread32(&mcasp0_regs->ahclkxctl);
+		temp_reg |= (clk_div_val <<
+					OMAPL_MCASP_AHCLKXCTL_HCLKXDIV_SHIFT);
+		iowrite32(temp_reg, &mcasp0_regs->ahclkxctl);
+	} else {
+		return -EINVAL ;
+	}
+	return status;
+}
+
+/*
+ * mcasp RX buard rate setting routine
+ */
+static s16 suart_mcasp_rx_baud_set(u32 rx_baud_value,
+	u32 oversampling, struct pruss_suart_iomap *pruss_ioaddr)
+{
+	u32 clk_div_val = 0;
+	u32 loop_cnt = 0;
+	s16 status = 0;
+	u32 temp_reg = 0;
+	struct omapl_mcasp_regs_ovly __iomem *mcasp0_regs =
+					pruss_ioaddr->mcasp_io_addr;
+
+	switch (oversampling) {
+	case SUART_8X_OVRSMPL:
+		for (loop_cnt = 0; loop_cnt < SUART_NUM_OF_BAUDS_SUPPORTED;
+		     loop_cnt++) {
+			if (rx_baud_value == lt_rx_8x_baud_rate[loop_cnt][0]) {
+				clk_div_val = lt_rx_8x_baud_rate[loop_cnt][2];
+				temp_reg = ioread32(&mcasp0_regs->aclkrctl);
+				temp_reg |= (clk_div_val <<
+					OMAPL_MCASP_ACLKXCTL_CLKXDIV_SHIFT);
+				iowrite32(temp_reg, &mcasp0_regs->aclkrctl);
+
+				clk_div_val =
+				lt_rx_8x_baud_rate[loop_cnt][3] - 1;
+
+				temp_reg = ioread32(&mcasp0_regs->ahclkrctl);
+				temp_reg |= (clk_div_val <<
+					OMAPL_MCASP_AHCLKXCTL_HCLKXDIV_SHIFT);
+				iowrite32(temp_reg, &mcasp0_regs->ahclkrctl);
+				break;
+			}
+		}
+		status = -EINVAL;
+		break;
+	case SUART_16X_OVRSMPL:
+		for (loop_cnt = 0; loop_cnt < SUART_NUM_OF_BAUDS_SUPPORTED;
+		     loop_cnt++) {
+			if (rx_baud_value == lt_rx_16x_baud_rate[loop_cnt][0]) {
+				clk_div_val = lt_rx_16x_baud_rate[loop_cnt][2];
+				temp_reg = ioread32(&mcasp0_regs->aclkrctl);
+				temp_reg |= (clk_div_val <<
+					OMAPL_MCASP_ACLKXCTL_CLKXDIV_SHIFT);
+				iowrite32(temp_reg, &mcasp0_regs->aclkrctl);
+				clk_div_val = lt_rx_16x_baud_rate[loop_cnt][3];
+				temp_reg = ioread32(&mcasp0_regs->ahclkrctl);
+				temp_reg |= (clk_div_val <<
+					OMAPL_MCASP_AHCLKXCTL_HCLKXDIV_SHIFT);
+				iowrite32(temp_reg, &mcasp0_regs->ahclkrctl);
+				break;
+			}
+		}
+		status = -EINVAL;
+		break;
+	case SUART_TX_OVRSMPL:
+		for (loop_cnt = 0; loop_cnt < SUART_NUM_OF_BAUDS_SUPPORTED;
+		     loop_cnt++) {
+			if (rx_baud_value == lt_tx_baud_rate[loop_cnt][0]) {
+				clk_div_val = lt_tx_baud_rate[loop_cnt][2];
+				temp_reg = ioread32(&mcasp0_regs->aclkrctl);
+				temp_reg |= (clk_div_val <<
+					OMAPL_MCASP_ACLKXCTL_CLKXDIV_SHIFT);
+				iowrite32(temp_reg, &mcasp0_regs->aclkrctl);
+				clk_div_val = lt_tx_baud_rate[loop_cnt][3];
+				temp_reg = ioread32(&mcasp0_regs->ahclkrctl);
+				temp_reg |= (clk_div_val <<
+					OMAPL_MCASP_AHCLKXCTL_HCLKXDIV_SHIFT);
+				iowrite32(temp_reg, &mcasp0_regs->ahclkrctl);
+				break;
+			}
+		}
+		status = -EINVAL;
+		break;
+	default:
+		status = -EINVAL;
+		break;
+	}
+
+	return status;
+}
+
+/*
+ * mcasp buard rate setting routine
+ */
+s16 suart_asp_baud_set(u32 tx_baud_value, u32 rx_baud_value, u32 oversampling,
+					struct pruss_suart_iomap *pruss_ioaddr)
+{
+	s16 status = 0;
+
+	status = suart_mcasp_tx_baud_set(tx_baud_value, pruss_ioaddr);
+	status = suart_mcasp_rx_baud_set(rx_baud_value, oversampling,
+					pruss_ioaddr);
+
+	return status;
+}
+
+/*
+ * mcasp deactivate the selected serializer
+ */
+s16 suart_asp_serializer_deactivate(u16 sr_num,
+		struct pruss_suart_iomap *pruss_ioaddr)
+{
+	s16 status = 0;
+	struct omapl_mcasp_regs_ovly __iomem *mcasp0_regs =
+		 pruss_ioaddr->mcasp_io_addr;
+	if (sr_num > 15)
+		status = -EINVAL;
+	else
+		iowrite32(MCASP_SUART_SRCTL_DISMOD, &mcasp0_regs->srctl0);
+
+	return status;
+}
diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
index 758c5b0..eae37fe 100644
--- a/include/linux/serial_core.h
+++ b/include/linux/serial_core.h
@@ -202,6 +202,8 @@
 /* VIA VT8500 SoC */
 #define PORT_VT8500	97
 
+#define PORT_DA8XX_PRU_SUART	98
+
 #ifdef __KERNEL__
 
 #include <linux/compiler.h>
-- 
1.7.2.3