Re: [PATCH 1/5] FPGA: Add TS-7300 FPGA manager

[Alan Tull <delicious.quinoa@gmail.com>]

On Tue, Mar 14, 2017 at 9:24 PM, Florian Fainelli <f.fainelli@gmail.com> wrote:

Hi Florain,

I reposted your patches with a minor fixup on 2/27.  I never heard
back that it made it into next but I think that's normal at this point
of the Linux cycle.

Alan

>
>
> On 02/27/2017 02:14 PM, Alan Tull wrote:
>> From: Florian Fainelli <f.fainelli@gmail.com>
>>
>> Add support for loading bitstreams on the Altera Cyclone II FPGA
>> populated on the TS-7300 board. This is done through the configuration
>> and data registers offered through a memory interface between the EP93xx
>> SoC and the FPGA via an intermediate CPLD device.
>>
>> The EP93xx SoC on the TS-7300 does not have direct means of configuring
>> the on-board FPGA other than by using the special memory mapped
>> interface to the CPLD. No other entity on the system can control the
>> FPGA bitstream.
>>
>> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
>> Acked-by: Alan Tull <atull@opensource.altera.com>
>> Acked-by: Moritz Fischer <moritz.fischer@ettus.com>
>
> Is this queued somewhere for 4.11? I see Jason's zynq patches merged in,
> but not these two ep93xx ones?
>
> https://git.kernel.org/pub/scm/linux/kernel/git/atull/linux-fpga.git/log/?h=test
>
> Thanks
>
>> ---
>> v5: 'return fpga_mgr_register' at end of probe function
>> ---
>>  drivers/fpga/Kconfig       |   7 ++
>>  drivers/fpga/Makefile      |   1 +
>>  drivers/fpga/ts73xx-fpga.c | 156 +++++++++++++++++++++++++++++++++++++++++++++
>>  3 files changed, 164 insertions(+)
>>  create mode 100644 drivers/fpga/ts73xx-fpga.c
>>
>> diff --git a/drivers/fpga/Kconfig b/drivers/fpga/Kconfig
>> index ce861a2..d9cbef6 100644
>> --- a/drivers/fpga/Kconfig
>> +++ b/drivers/fpga/Kconfig
>> @@ -33,6 +33,13 @@ config FPGA_MGR_SOCFPGA_A10
>>       help
>>         FPGA manager driver support for Altera Arria10 SoCFPGA.
>>
>> +config FPGA_MGR_TS73XX
>> +     tristate "Technologic Systems TS-73xx SBC FPGA Manager"
>> +     depends on ARCH_EP93XX && MACH_TS72XX
>> +     help
>> +       FPGA manager driver support for the Altera Cyclone II FPGA
>> +       present on the TS-73xx SBC boards.
>> +
>>  config FPGA_MGR_ZYNQ_FPGA
>>       tristate "Xilinx Zynq FPGA"
>>       depends on ARCH_ZYNQ || COMPILE_TEST
>> diff --git a/drivers/fpga/Makefile b/drivers/fpga/Makefile
>> index 8df07bc..a116016 100644
>> --- a/drivers/fpga/Makefile
>> +++ b/drivers/fpga/Makefile
>> @@ -8,6 +8,7 @@ obj-$(CONFIG_FPGA)                    += fpga-mgr.o
>>  # FPGA Manager Drivers
>>  obj-$(CONFIG_FPGA_MGR_SOCFPGA)               += socfpga.o
>>  obj-$(CONFIG_FPGA_MGR_SOCFPGA_A10)   += socfpga-a10.o
>> +obj-$(CONFIG_FPGA_MGR_TS73XX)                += ts73xx-fpga.o
>>  obj-$(CONFIG_FPGA_MGR_ZYNQ_FPGA)     += zynq-fpga.o
>>
>>  # FPGA Bridge Drivers
>> diff --git a/drivers/fpga/ts73xx-fpga.c b/drivers/fpga/ts73xx-fpga.c
>> new file mode 100644
>> index 0000000..f6a96b4
>> --- /dev/null
>> +++ b/drivers/fpga/ts73xx-fpga.c
>> @@ -0,0 +1,156 @@
>> +/*
>> + * Technologic Systems TS-73xx SBC FPGA loader
>> + *
>> + * Copyright (C) 2016 Florian Fainelli <f.fainelli@gmail.com>
>> + *
>> + * FPGA Manager Driver for the on-board Altera Cyclone II FPGA found on
>> + * TS-7300, heavily based on load_fpga.c in their vendor tree.
>> + *
>> + * 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 of the License.
>> + *
>> + * 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.
>> + */
>> +
>> +#include <linux/delay.h>
>> +#include <linux/io.h>
>> +#include <linux/module.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/string.h>
>> +#include <linux/iopoll.h>
>> +#include <linux/fpga/fpga-mgr.h>
>> +
>> +#define TS73XX_FPGA_DATA_REG         0
>> +#define TS73XX_FPGA_CONFIG_REG               1
>> +
>> +#define TS73XX_FPGA_WRITE_DONE               0x1
>> +#define TS73XX_FPGA_WRITE_DONE_TIMEOUT       1000    /* us */
>> +#define TS73XX_FPGA_RESET            0x2
>> +#define TS73XX_FPGA_RESET_LOW_DELAY  30      /* us */
>> +#define TS73XX_FPGA_RESET_HIGH_DELAY 80      /* us */
>> +#define TS73XX_FPGA_LOAD_OK          0x4
>> +#define TS73XX_FPGA_CONFIG_LOAD              0x8
>> +
>> +struct ts73xx_fpga_priv {
>> +     void __iomem    *io_base;
>> +     struct device   *dev;
>> +};
>> +
>> +static enum fpga_mgr_states ts73xx_fpga_state(struct fpga_manager *mgr)
>> +{
>> +     return FPGA_MGR_STATE_UNKNOWN;
>> +}
>> +
>> +static int ts73xx_fpga_write_init(struct fpga_manager *mgr,
>> +                               struct fpga_image_info *info,
>> +                               const char *buf, size_t count)
>> +{
>> +     struct ts73xx_fpga_priv *priv = mgr->priv;
>> +
>> +     /* Reset the FPGA */
>> +     writeb(0, priv->io_base + TS73XX_FPGA_CONFIG_REG);
>> +     udelay(TS73XX_FPGA_RESET_LOW_DELAY);
>> +     writeb(TS73XX_FPGA_RESET, priv->io_base + TS73XX_FPGA_CONFIG_REG);
>> +     udelay(TS73XX_FPGA_RESET_HIGH_DELAY);
>> +
>> +     return 0;
>> +}
>> +
>> +static int ts73xx_fpga_write(struct fpga_manager *mgr, const char *buf,
>> +                          size_t count)
>> +{
>> +     struct ts73xx_fpga_priv *priv = mgr->priv;
>> +     size_t i = 0;
>> +     int ret;
>> +     u8 reg;
>> +
>> +     while (count--) {
>> +             ret = readb_poll_timeout(priv->io_base + TS73XX_FPGA_CONFIG_REG,
>> +                                      reg, !(reg & TS73XX_FPGA_WRITE_DONE),
>> +                                      1, TS73XX_FPGA_WRITE_DONE_TIMEOUT);
>> +             if (ret < 0)
>> +                     return ret;
>> +
>> +             writeb(buf[i], priv->io_base + TS73XX_FPGA_DATA_REG);
>> +             i++;
>> +     }
>> +
>> +     return 0;
>> +}
>> +
>> +static int ts73xx_fpga_write_complete(struct fpga_manager *mgr,
>> +                                   struct fpga_image_info *info)
>> +{
>> +     struct ts73xx_fpga_priv *priv = mgr->priv;
>> +     u8 reg;
>> +
>> +     usleep_range(1000, 2000);
>> +     reg = readb(priv->io_base + TS73XX_FPGA_CONFIG_REG);
>> +     reg |= TS73XX_FPGA_CONFIG_LOAD;
>> +     writeb(reg, priv->io_base + TS73XX_FPGA_CONFIG_REG);
>> +
>> +     usleep_range(1000, 2000);
>> +     reg = readb(priv->io_base + TS73XX_FPGA_CONFIG_REG);
>> +     reg &= ~TS73XX_FPGA_CONFIG_LOAD;
>> +     writeb(reg, priv->io_base + TS73XX_FPGA_CONFIG_REG);
>> +
>> +     reg = readb(priv->io_base + TS73XX_FPGA_CONFIG_REG);
>> +     if ((reg & TS73XX_FPGA_LOAD_OK) != TS73XX_FPGA_LOAD_OK)
>> +             return -ETIMEDOUT;
>> +
>> +     return 0;
>> +}
>> +
>> +static const struct fpga_manager_ops ts73xx_fpga_ops = {
>> +     .state          = ts73xx_fpga_state,
>> +     .write_init     = ts73xx_fpga_write_init,
>> +     .write          = ts73xx_fpga_write,
>> +     .write_complete = ts73xx_fpga_write_complete,
>> +};
>> +
>> +static int ts73xx_fpga_probe(struct platform_device *pdev)
>> +{
>> +     struct device *kdev = &pdev->dev;
>> +     struct ts73xx_fpga_priv *priv;
>> +     struct resource *res;
>> +
>> +     priv = devm_kzalloc(kdev, sizeof(*priv), GFP_KERNEL);
>> +     if (!priv)
>> +             return -ENOMEM;
>> +
>> +     priv->dev = kdev;
>> +
>> +     res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +     priv->io_base = devm_ioremap_resource(kdev, res);
>> +     if (IS_ERR(priv->io_base)) {
>> +             dev_err(kdev, "unable to remap registers\n");
>> +             return PTR_ERR(priv->io_base);
>> +     }
>> +
>> +     return fpga_mgr_register(kdev, "TS-73xx FPGA Manager",
>> +                              &ts73xx_fpga_ops, priv);
>> +}
>> +
>> +static int ts73xx_fpga_remove(struct platform_device *pdev)
>> +{
>> +     fpga_mgr_unregister(&pdev->dev);
>> +
>> +     return 0;
>> +}
>> +
>> +static struct platform_driver ts73xx_fpga_driver = {
>> +     .driver = {
>> +             .name   = "ts73xx-fpga-mgr",
>> +     },
>> +     .probe  = ts73xx_fpga_probe,
>> +     .remove = ts73xx_fpga_remove,
>> +};
>> +module_platform_driver(ts73xx_fpga_driver);
>> +
>> +MODULE_AUTHOR("Florian Fainelli <f.fainelli@gmail.com>");
>> +MODULE_DESCRIPTION("TS-73xx FPGA Manager driver");
>> +MODULE_LICENSE("GPL v2");
>>
>
> --
> Florian