[1/5] FPGA: Add TS-7300 FPGA manager
diff mbox

Message ID 20170227221426.4176-2-atull@kernel.org
State Accepted
Headers show

Commit Message

Alan Tull Feb. 27, 2017, 10:14 p.m. UTC
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>
---
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

Comments

Florian Fainelli March 15, 2017, 2:24 a.m. UTC | #1
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");
>
Alan Tull March 15, 2017, 4:45 p.m. UTC | #2
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
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Patch
diff mbox

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");