* [PATCH v3] clocksource: dw_apb_timer: Add common DTS glue for dw_apb_timer
@ 2012-07-11 16:12 dinguyen at altera.com
2012-07-11 16:20 ` Pavel Machek
0 siblings, 1 reply; 5+ messages in thread
From: dinguyen at altera.com @ 2012-07-11 16:12 UTC (permalink / raw)
To: linux-arm-kernel
From: Dinh Nguyen <dinguyen@altera.com>
Make a common device tree glue for clocksource/dw_apb_timer.
Move mach-picoxcell/time.c to be a generic device tree application
of the dw_apb_timer.
Configure mach-picoxcell to use the dw_apb_timer_of device tree
implementation in drivers/clocksource.
Signed-off-by: Pavel Machek <pavel@denx.de>
Signed-off-by: Dinh Nguyen <dinguyen@altera.com>
Acked-by: Jamie Iles <jamie@jamieiles.com>
---
Documentation/devicetree/bindings/rtc/dw-apb.txt | 24 ++++++++++
arch/arm/Kconfig | 1 +
arch/arm/mach-picoxcell/Makefile | 1 -
arch/arm/mach-picoxcell/common.c | 3 +-
arch/arm/mach-picoxcell/common.h | 2 +-
drivers/clocksource/Kconfig | 3 ++
drivers/clocksource/Makefile | 1 +
.../clocksource/dw_apb_timer_of.c | 47 ++++++++++++--------
8 files changed, 60 insertions(+), 22 deletions(-)
create mode 100644 Documentation/devicetree/bindings/rtc/dw-apb.txt
rename arch/arm/mach-picoxcell/time.c => drivers/clocksource/dw_apb_timer_of.c (61%)
diff --git a/Documentation/devicetree/bindings/rtc/dw-apb.txt b/Documentation/devicetree/bindings/rtc/dw-apb.txt
new file mode 100644
index 0000000..bbc459c
--- /dev/null
+++ b/Documentation/devicetree/bindings/rtc/dw-apb.txt
@@ -0,0 +1,24 @@
+* Designware APB timer
+
+Required properties:
+- compatible: "snps,dw-apb-timer-sp" or "snps,dw-apb-timer-osc"
+- reg: physical base address of the controller and length of memory mapped
+ region.
+- interrupts: IRQ line for the timer.
+- clock-frequency: The frequency in HZ of the timer.
+
+Example:
+
+ timer1: timer at ffc09000 {
+ compatible = "snps,dw-apb-timer-sp";
+ interrupts = <0 168 4>;
+ clock-frequency = <200000000>;
+ reg = <0xffc09000 0x1000>;
+ };
+
+ timer2: timer at ffd00000 {
+ compatible = "snps,dw-apb-timer-osc";
+ interrupts = <0 169 4>;
+ clock-frequency = <200000000>;
+ reg = <0xffd00000 0x1000>;
+ };
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index a91009c..57eb6ef 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -658,6 +658,7 @@ config ARCH_PICOXCELL
select ARM_VIC
select CPU_V6K
select DW_APB_TIMER
+ select DW_APB_TIMER_OF
select GENERIC_CLOCKEVENTS
select GENERIC_GPIO
select HAVE_TCM
diff --git a/arch/arm/mach-picoxcell/Makefile b/arch/arm/mach-picoxcell/Makefile
index e5ec4a8..8e39f80 100644
--- a/arch/arm/mach-picoxcell/Makefile
+++ b/arch/arm/mach-picoxcell/Makefile
@@ -1,2 +1 @@
obj-y := common.o
-obj-y += time.o
diff --git a/arch/arm/mach-picoxcell/common.c b/arch/arm/mach-picoxcell/common.c
index a2e8ae8..8f9a0b4 100644
--- a/arch/arm/mach-picoxcell/common.c
+++ b/arch/arm/mach-picoxcell/common.c
@@ -14,6 +14,7 @@
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/of_platform.h>
+#include <linux/dw_apb_timer.h>
#include <asm/mach/arch.h>
#include <asm/hardware/vic.h>
@@ -97,7 +98,7 @@ DT_MACHINE_START(PICOXCELL, "Picochip picoXcell")
.nr_irqs = NR_IRQS_LEGACY,
.init_irq = picoxcell_init_irq,
.handle_irq = vic_handle_irq,
- .timer = &picoxcell_timer,
+ .timer = &dw_apb_timer,
.init_machine = picoxcell_init_machine,
.dt_compat = picoxcell_dt_match,
.restart = picoxcell_wdt_restart,
diff --git a/arch/arm/mach-picoxcell/common.h b/arch/arm/mach-picoxcell/common.h
index 83d55ab..a65cb02 100644
--- a/arch/arm/mach-picoxcell/common.h
+++ b/arch/arm/mach-picoxcell/common.h
@@ -12,6 +12,6 @@
#include <asm/mach/time.h>
-extern struct sys_timer picoxcell_timer;
+extern struct sys_timer dw_apb_timer;
#endif /* __PICOXCELL_COMMON_H__ */
diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index 99c6b20..e62bc7e 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -16,6 +16,9 @@ config CLKSRC_MMIO
config DW_APB_TIMER
bool
+config DW_APB_TIMER_OF
+ bool
+
config CLKSRC_DBX500_PRCMU
bool "Clocksource PRCMU Timer"
depends on UX500_SOC_DB8500
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index dd3e661..2cdaf7d 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -10,4 +10,5 @@ obj-$(CONFIG_EM_TIMER_STI) += em_sti.o
obj-$(CONFIG_CLKBLD_I8253) += i8253.o
obj-$(CONFIG_CLKSRC_MMIO) += mmio.o
obj-$(CONFIG_DW_APB_TIMER) += dw_apb_timer.o
+obj-$(CONFIG_DW_APB_TIMER_OF) += dw_apb_timer_of.o
obj-$(CONFIG_CLKSRC_DBX500_PRCMU) += clksrc-dbx500-prcmu.o
\ No newline at end of file
diff --git a/arch/arm/mach-picoxcell/time.c b/drivers/clocksource/dw_apb_timer_of.c
similarity index 61%
rename from arch/arm/mach-picoxcell/time.c
rename to drivers/clocksource/dw_apb_timer_of.c
index 2ecba67..f07122a 100644
--- a/arch/arm/mach-picoxcell/time.c
+++ b/drivers/clocksource/dw_apb_timer_of.c
@@ -1,11 +1,20 @@
/*
+ * Copyright (C) 2012 Altera Corporation
* Copyright (c) 2011 Picochip Ltd., Jamie Iles
*
+ * Modified from mach-picoxcell/time.c
+ *
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
- * All enquiries to support at picochip.com
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/dw_apb_timer.h>
#include <linux/of.h>
@@ -15,8 +24,6 @@
#include <asm/mach/time.h>
#include <asm/sched_clock.h>
-#include "common.h"
-
static void timer_get_base_and_rate(struct device_node *np,
void __iomem **base, u32 *rate)
{
@@ -29,7 +36,7 @@ static void timer_get_base_and_rate(struct device_node *np,
panic("No clock-freq property for %s", np->name);
}
-static void picoxcell_add_clockevent(struct device_node *event_timer)
+static void add_clockevent(struct device_node *event_timer)
{
void __iomem *iobase;
struct dw_apb_clock_event_device *ced;
@@ -49,7 +56,7 @@ static void picoxcell_add_clockevent(struct device_node *event_timer)
dw_apb_clockevent_register(ced);
}
-static void picoxcell_add_clocksource(struct device_node *source_timer)
+static void add_clocksource(struct device_node *source_timer)
{
void __iomem *iobase;
struct dw_apb_clocksource *cs;
@@ -67,55 +74,57 @@ static void picoxcell_add_clocksource(struct device_node *source_timer)
static void __iomem *sched_io_base;
-static u32 picoxcell_read_sched_clock(void)
+static u32 read_sched_clock(void)
{
return __raw_readl(sched_io_base);
}
-static const struct of_device_id picoxcell_rtc_ids[] __initconst = {
+static const struct of_device_id sptimer_ids[] __initconst = {
{ .compatible = "picochip,pc3x2-rtc" },
+ { .compatible = "snps,dw-apb-timer-sp" },
{ /* Sentinel */ },
};
-static void picoxcell_init_sched_clock(void)
+static void init_sched_clock(void)
{
struct device_node *sched_timer;
u32 rate;
- sched_timer = of_find_matching_node(NULL, picoxcell_rtc_ids);
+ sched_timer = of_find_matching_node(NULL, sptimer_ids);
if (!sched_timer)
panic("No RTC for sched clock to use");
timer_get_base_and_rate(sched_timer, &sched_io_base, &rate);
of_node_put(sched_timer);
- setup_sched_clock(picoxcell_read_sched_clock, 32, rate);
+ setup_sched_clock(read_sched_clock, 32, rate);
}
-static const struct of_device_id picoxcell_timer_ids[] __initconst = {
+static const struct of_device_id osctimer_ids[] __initconst = {
{ .compatible = "picochip,pc3x2-timer" },
+ { .compatible = "snps,dw-apb-timer-osc" },
{},
};
-static void __init picoxcell_timer_init(void)
+static void __init timer_init(void)
{
struct device_node *event_timer, *source_timer;
- event_timer = of_find_matching_node(NULL, picoxcell_timer_ids);
+ event_timer = of_find_matching_node(NULL, osctimer_ids);
if (!event_timer)
panic("No timer for clockevent");
- picoxcell_add_clockevent(event_timer);
+ add_clockevent(event_timer);
- source_timer = of_find_matching_node(event_timer, picoxcell_timer_ids);
+ source_timer = of_find_matching_node(event_timer, osctimer_ids);
if (!source_timer)
panic("No timer for clocksource");
- picoxcell_add_clocksource(source_timer);
+ add_clocksource(source_timer);
of_node_put(source_timer);
- picoxcell_init_sched_clock();
+ init_sched_clock();
}
-struct sys_timer picoxcell_timer = {
- .init = picoxcell_timer_init,
+struct sys_timer dw_apb_timer = {
+ .init = timer_init,
};
--
1.7.9.5
^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH v3] clocksource: dw_apb_timer: Add common DTS glue for dw_apb_timer
2012-07-11 16:12 [PATCH v3] clocksource: dw_apb_timer: Add common DTS glue for dw_apb_timer dinguyen at altera.com
@ 2012-07-11 16:20 ` Pavel Machek
2012-07-11 17:37 ` Rob Herring
0 siblings, 1 reply; 5+ messages in thread
From: Pavel Machek @ 2012-07-11 16:20 UTC (permalink / raw)
To: linux-arm-kernel
Hi!
> Make a common device tree glue for clocksource/dw_apb_timer.
> Move mach-picoxcell/time.c to be a generic device tree application
> of the dw_apb_timer.
>
> Configure mach-picoxcell to use the dw_apb_timer_of device tree
> implementation in drivers/clocksource.
>
> Signed-off-by: Pavel Machek <pavel@denx.de>
> Signed-off-by: Dinh Nguyen <dinguyen@altera.com>
> Acked-by: Jamie Iles <jamie@jamieiles.com>
Ok, this is getting complex.
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/rtc/dw-apb.txt
> @@ -0,0 +1,24 @@
> +* Designware APB timer
> +
> +Required properties:
> +- compatible: "snps,dw-apb-timer-sp" or "snps,dw-apb-timer-osc"
> +- reg: physical base address of the controller and length of memory mapped
> + region.
> +- interrupts: IRQ line for the timer.
> +- clock-frequency: The frequency in HZ of the timer.
I know device-tree maintainers requested -freq -> -frequency,
> --- a/arch/arm/mach-picoxcell/time.c
> +++ b/drivers/clocksource/dw_apb_timer_of.c
But then this will need updating to accept "-frequency",
> -static const struct of_device_id picoxcell_timer_ids[] __initconst = {
> +static const struct of_device_id osctimer_ids[] __initconst = {
> { .compatible = "picochip,pc3x2-timer" },
> + { .compatible = "snps,dw-apb-timer-osc" },
> {},
> };
and dts will need to be updated, anyway, so we could update
"picochip,pc3x2-timer" -> "snps,dw-apb-timer-osc" as well, right?
Alternatively, we could just keep using "-freq"....
Or am I overlooking something?
Otherwise looks ok to me.
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH v3] clocksource: dw_apb_timer: Add common DTS glue for dw_apb_timer
2012-07-11 16:20 ` Pavel Machek
@ 2012-07-11 17:37 ` Rob Herring
2012-07-11 19:35 ` Dinh Nguyen
0 siblings, 1 reply; 5+ messages in thread
From: Rob Herring @ 2012-07-11 17:37 UTC (permalink / raw)
To: linux-arm-kernel
On 07/11/2012 11:20 AM, Pavel Machek wrote:
> Hi!
>
>> Make a common device tree glue for clocksource/dw_apb_timer.
>> Move mach-picoxcell/time.c to be a generic device tree application
>> of the dw_apb_timer.
>>
>> Configure mach-picoxcell to use the dw_apb_timer_of device tree
>> implementation in drivers/clocksource.
>>
>> Signed-off-by: Pavel Machek <pavel@denx.de>
>> Signed-off-by: Dinh Nguyen <dinguyen@altera.com>
>> Acked-by: Jamie Iles <jamie@jamieiles.com>
>
> Ok, this is getting complex.
>
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/rtc/dw-apb.txt
>> @@ -0,0 +1,24 @@
>> +* Designware APB timer
>> +
>> +Required properties:
>> +- compatible: "snps,dw-apb-timer-sp" or "snps,dw-apb-timer-osc"
>> +- reg: physical base address of the controller and length of memory mapped
>> + region.
>> +- interrupts: IRQ line for the timer.
>> +- clock-frequency: The frequency in HZ of the timer.
>
> I know device-tree maintainers requested -freq -> -frequency,
>> --- a/arch/arm/mach-picoxcell/time.c
>> +++ b/drivers/clocksource/dw_apb_timer_of.c
>
> But then this will need updating to accept "-frequency",
>
>> -static const struct of_device_id picoxcell_timer_ids[] __initconst = {
>> +static const struct of_device_id osctimer_ids[] __initconst = {
>> { .compatible = "picochip,pc3x2-timer" },
>> + { .compatible = "snps,dw-apb-timer-osc" },
>> {},
>> };
>
> and dts will need to be updated, anyway, so we could update
> "picochip,pc3x2-timer" -> "snps,dw-apb-timer-osc" as well, right?
>
> Alternatively, we could just keep using "-freq"....
>
> Or am I overlooking something?
If picoxcell is already using "-freq", then yes, you'll have to keep it
for compatibility. You have to assume that a dtb cannot be changed.
Rob
^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH v3] clocksource: dw_apb_timer: Add common DTS glue for dw_apb_timer
2012-07-11 17:37 ` Rob Herring
@ 2012-07-11 19:35 ` Dinh Nguyen
2012-07-11 19:38 ` Rob Herring
0 siblings, 1 reply; 5+ messages in thread
From: Dinh Nguyen @ 2012-07-11 19:35 UTC (permalink / raw)
To: linux-arm-kernel
On Wed, 2012-07-11 at 12:37 -0500, Rob Herring wrote:
> On 07/11/2012 11:20 AM, Pavel Machek wrote:
> > Hi!
> >
> >> Make a common device tree glue for clocksource/dw_apb_timer.
> >> Move mach-picoxcell/time.c to be a generic device tree application
> >> of the dw_apb_timer.
> >>
> >> Configure mach-picoxcell to use the dw_apb_timer_of device tree
> >> implementation in drivers/clocksource.
> >>
> >> Signed-off-by: Pavel Machek <pavel@denx.de>
> >> Signed-off-by: Dinh Nguyen <dinguyen@altera.com>
> >> Acked-by: Jamie Iles <jamie@jamieiles.com>
> >
> > Ok, this is getting complex.
> >
> >> --- /dev/null
> >> +++ b/Documentation/devicetree/bindings/rtc/dw-apb.txt
> >> @@ -0,0 +1,24 @@
> >> +* Designware APB timer
> >> +
> >> +Required properties:
> >> +- compatible: "snps,dw-apb-timer-sp" or "snps,dw-apb-timer-osc"
> >> +- reg: physical base address of the controller and length of memory mapped
> >> + region.
> >> +- interrupts: IRQ line for the timer.
> >> +- clock-frequency: The frequency in HZ of the timer.
> >
> > I know device-tree maintainers requested -freq -> -frequency,
> >> --- a/arch/arm/mach-picoxcell/time.c
> >> +++ b/drivers/clocksource/dw_apb_timer_of.c
> >
> > But then this will need updating to accept "-frequency",
> >
> >> -static const struct of_device_id picoxcell_timer_ids[] __initconst = {
> >> +static const struct of_device_id osctimer_ids[] __initconst = {
> >> { .compatible = "picochip,pc3x2-timer" },
> >> + { .compatible = "snps,dw-apb-timer-osc" },
> >> {},
> >> };
> >
> > and dts will need to be updated, anyway, so we could update
> > "picochip,pc3x2-timer" -> "snps,dw-apb-timer-osc" as well, right?
> >
> > Alternatively, we could just keep using "-freq"....
> >
> > Or am I overlooking something?
>
> If picoxcell is already using "-freq", then yes, you'll have to keep it
> for compatibility. You have to assume that a dtb cannot be changed.
So just to be sure, since we don't want to create churn in the dts
files. Only picoxcell is using clock-freq, so to keep compatibility,
something like this should be done:
- if (of_property_read_u32(np, "clock-freq", rate))
+ if (of_property_read_u32(np, "clock-freq", rate) &&
+ of_property_read_u32(np, "clock-frequency", rate))
panic("No clock-frequency property for %s", np->name);
Going forward, platforms that use the dq_apb_timer should use
clock-frequency?
Thanks,
Dinh
>
> Rob
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH v3] clocksource: dw_apb_timer: Add common DTS glue for dw_apb_timer
2012-07-11 19:35 ` Dinh Nguyen
@ 2012-07-11 19:38 ` Rob Herring
0 siblings, 0 replies; 5+ messages in thread
From: Rob Herring @ 2012-07-11 19:38 UTC (permalink / raw)
To: linux-arm-kernel
On 07/11/2012 02:35 PM, Dinh Nguyen wrote:
> On Wed, 2012-07-11 at 12:37 -0500, Rob Herring wrote:
>> On 07/11/2012 11:20 AM, Pavel Machek wrote:
>>> Hi!
>>>
>>>> Make a common device tree glue for clocksource/dw_apb_timer.
>>>> Move mach-picoxcell/time.c to be a generic device tree application
>>>> of the dw_apb_timer.
>>>>
>>>> Configure mach-picoxcell to use the dw_apb_timer_of device tree
>>>> implementation in drivers/clocksource.
>>>>
>>>> Signed-off-by: Pavel Machek <pavel@denx.de>
>>>> Signed-off-by: Dinh Nguyen <dinguyen@altera.com>
>>>> Acked-by: Jamie Iles <jamie@jamieiles.com>
>>>
>>> Ok, this is getting complex.
>>>
>>>> --- /dev/null
>>>> +++ b/Documentation/devicetree/bindings/rtc/dw-apb.txt
>>>> @@ -0,0 +1,24 @@
>>>> +* Designware APB timer
>>>> +
>>>> +Required properties:
>>>> +- compatible: "snps,dw-apb-timer-sp" or "snps,dw-apb-timer-osc"
>>>> +- reg: physical base address of the controller and length of memory mapped
>>>> + region.
>>>> +- interrupts: IRQ line for the timer.
>>>> +- clock-frequency: The frequency in HZ of the timer.
>>>
>>> I know device-tree maintainers requested -freq -> -frequency,
>>>> --- a/arch/arm/mach-picoxcell/time.c
>>>> +++ b/drivers/clocksource/dw_apb_timer_of.c
>>>
>>> But then this will need updating to accept "-frequency",
>>>
>>>> -static const struct of_device_id picoxcell_timer_ids[] __initconst = {
>>>> +static const struct of_device_id osctimer_ids[] __initconst = {
>>>> { .compatible = "picochip,pc3x2-timer" },
>>>> + { .compatible = "snps,dw-apb-timer-osc" },
>>>> {},
>>>> };
>>>
>>> and dts will need to be updated, anyway, so we could update
>>> "picochip,pc3x2-timer" -> "snps,dw-apb-timer-osc" as well, right?
>>>
>>> Alternatively, we could just keep using "-freq"....
>>>
>>> Or am I overlooking something?
>>
>> If picoxcell is already using "-freq", then yes, you'll have to keep it
>> for compatibility. You have to assume that a dtb cannot be changed.
>
> So just to be sure, since we don't want to create churn in the dts
> files. Only picoxcell is using clock-freq, so to keep compatibility,
> something like this should be done:
>
> - if (of_property_read_u32(np, "clock-freq", rate))
> + if (of_property_read_u32(np, "clock-freq", rate) &&
> + of_property_read_u32(np, "clock-frequency", rate))
> panic("No clock-frequency property for %s", np->name);
>
> Going forward, platforms that use the dq_apb_timer should use
> clock-frequency?
Yeah, that's fine.
Rob
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2012-07-11 19:38 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2012-07-11 16:12 [PATCH v3] clocksource: dw_apb_timer: Add common DTS glue for dw_apb_timer dinguyen at altera.com
2012-07-11 16:20 ` Pavel Machek
2012-07-11 17:37 ` Rob Herring
2012-07-11 19:35 ` Dinh Nguyen
2012-07-11 19:38 ` Rob Herring
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