[PATCH 0/4] add gpio primcell pl061 support

[PATCH 0/4] add gpio primcell pl061 support

[Jean-Christophe PLAGNIOL-VILLARD]

Hi,

The following changes since commit 6bb06524d665b4fbcefddb6b914273466fe801dd:

  ARM pbl: actually create cached mappings in the decompressor (2012-10-04 18:30:58 +0200)

are available in the git repository at:

  git://git.jcrosoft.org/barebox.git tags/gpio_arm

for you to fetch changes up to 953ebaa113eda17d737d62673d53f593b4b076f3:

  versatilepb: add gpio support (2012-10-05 12:56:34 +0800)

----------------------------------------------------------------
add gpio primcell pl061 support

update gpiolib to select GENERIC_GPIO and provice a generic header

use is on versatilepb

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

----------------------------------------------------------------
Jean-Christophe PLAGNIOL-VILLARD (4):
      gpiolib: select GENERIC_GPIO
      gpio: provide generic gpio header
      gpio: add ARM Primcell pl061 support
      versatilepb: add gpio support

 arch/arm/Kconfig                            |    1 +
 arch/arm/configs/versatilepb_defconfig      |    2 +
 arch/arm/mach-versatile/core.c              |   10 +++++
 arch/arm/mach-versatile/include/mach/gpio.h |    1 +
 drivers/gpio/Kconfig                        |    7 ++++
 drivers/gpio/Makefile                       |    2 +
 drivers/gpio/gpio-pl061.c                   |  168 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 include/asm-generic/gpio.h                  |   10 +++++
 include/linux/amba/pl061.h                  |   16 ++++++++
 9 files changed, 217 insertions(+)
 create mode 100644 arch/arm/mach-versatile/include/mach/gpio.h
 create mode 100644 drivers/gpio/gpio-pl061.c
 create mode 100644 include/asm-generic/gpio.h
 create mode 100644 include/linux/amba/pl061.h

Best Regards,
J.

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[PATCH 1/4] gpiolib: select GENERIC_GPIO

[Jean-Christophe PLAGNIOL-VILLARD]

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
 drivers/gpio/Kconfig |    1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index 022a309..f03fbf6 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -1,5 +1,6 @@
 config GPIOLIB
 	bool
+	select GENERIC_GPIO
 
 if GPIOLIB
 
-- 
1.7.10.4


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[PATCH 2/4] gpio: provide generic gpio header

[Jean-Christophe PLAGNIOL-VILLARD]

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
 include/asm-generic/gpio.h |   10 ++++++++++
 1 file changed, 10 insertions(+)
 create mode 100644 include/asm-generic/gpio.h

diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
new file mode 100644
index 0000000..1997888
--- /dev/null
+++ b/include/asm-generic/gpio.h
@@ -0,0 +1,10 @@
+#ifndef __ASM_GENERIC_GPIO_H
+#define __ASM_GENERIC_GPIO_H
+
+void gpio_set_value(unsigned gpio, int value);
+int gpio_get_value(unsigned gpio);
+int gpio_direction_output(unsigned gpio, int value);
+int gpio_direction_input(unsigned gpio);
+
+#endif /* __ASM_GENERIC_GPIO_H */
+
-- 
1.7.10.4


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[PATCH 3/4] gpio: add ARM Primcell pl061 support

[Jean-Christophe PLAGNIOL-VILLARD]

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
 arch/arm/Kconfig           |    1 +
 drivers/gpio/Kconfig       |    6 ++
 drivers/gpio/Makefile      |    2 +
 drivers/gpio/gpio-pl061.c  |  168 ++++++++++++++++++++++++++++++++++++++++++++
 include/linux/amba/pl061.h |   16 +++++
 5 files changed, 193 insertions(+)
 create mode 100644 drivers/gpio/gpio-pl061.c
 create mode 100644 include/linux/amba/pl061.h

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 8278c82..f599d5b 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -10,6 +10,7 @@ config ARM
 
 config ARM_AMBA
 	bool
+	select GPIOLIB
 
 config ARM_LINUX
 	bool
diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index f03fbf6..a0e9b58 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -6,6 +6,12 @@ if GPIOLIB
 
 menu "GPIO                          "
 
+config GPIO_PL061
+	bool "PrimeCell PL061 GPIO support"
+	depends on ARM_AMBA
+	help
+	  Say yes here to support the PrimeCell PL061 GPIO device
+
 config GPIO_STMPE
 	depends on I2C_STMPE
 	bool "STMPE GPIO Expander"
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 945122b..e2e97d3 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -1,2 +1,4 @@
 obj-$(CONFIG_GPIOLIB) += gpio.o
+
+obj-$(CONFIG_GPIO_PL061)	+= gpio-pl061.o
 obj-$(CONFIG_GPIO_STMPE) += gpio-stmpe.o
diff --git a/drivers/gpio/gpio-pl061.c b/drivers/gpio/gpio-pl061.c
new file mode 100644
index 0000000..ff4c883
--- /dev/null
+++ b/drivers/gpio/gpio-pl061.c
@@ -0,0 +1,168 @@
+/*
+ * Copyright (C) 2008, 2009 Provigent Ltd.
+ *
+ * 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.
+ *
+ * Driver for the ARM PrimeCell(tm) General Purpose Input/Output (PL061)
+ *
+ * Data sheet: ARM DDI 0190B, September 2000
+ */
+#include <common.h>
+#include <malloc.h>
+#include <errno.h>
+#include <io.h>
+#include <gpio.h>
+#include <init.h>
+
+#include <linux/amba/bus.h>
+#include <linux/amba/pl061.h>
+
+#define GPIODIR 0x400
+#define GPIOIS  0x404
+#define GPIOIBE 0x408
+#define GPIOIEV 0x40C
+#define GPIOIE  0x410
+#define GPIORIS 0x414
+#define GPIOMIS 0x418
+#define GPIOIC  0x41C
+
+#define PL061_GPIO_NR	8
+
+struct pl061_gpio {
+	void __iomem		*base;
+	struct gpio_chip	gc;
+};
+
+static int pl061_direction_input(struct gpio_chip *gc, unsigned offset)
+{
+	struct pl061_gpio *chip = container_of(gc, struct pl061_gpio, gc);
+	unsigned char gpiodir;
+
+	if (offset >= gc->ngpio)
+		return -EINVAL;
+
+	gpiodir = readb(chip->base + GPIODIR);
+	gpiodir &= ~(1 << offset);
+	writeb(gpiodir, chip->base + GPIODIR);
+
+	return 0;
+}
+
+static int pl061_direction_output(struct gpio_chip *gc, unsigned offset,
+		int value)
+{
+	struct pl061_gpio *chip = container_of(gc, struct pl061_gpio, gc);
+	unsigned char gpiodir;
+
+	if (offset >= gc->ngpio)
+		return -EINVAL;
+
+	writeb(!!value << offset, chip->base + (1 << (offset + 2)));
+	gpiodir = readb(chip->base + GPIODIR);
+	gpiodir |= 1 << offset;
+	writeb(gpiodir, chip->base + GPIODIR);
+
+	/*
+	 * gpio value is set again, because pl061 doesn't allow to set value of
+	 * a gpio pin before configuring it in OUT mode.
+	 */
+	writeb(!!value << offset, chip->base + (1 << (offset + 2)));
+
+	return 0;
+}
+
+static int pl061_get_value(struct gpio_chip *gc, unsigned offset)
+{
+	struct pl061_gpio *chip = container_of(gc, struct pl061_gpio, gc);
+
+	return !!readb(chip->base + (1 << (offset + 2)));
+}
+
+static void pl061_set_value(struct gpio_chip *gc, unsigned offset, int value)
+{
+	struct pl061_gpio *chip = container_of(gc, struct pl061_gpio, gc);
+
+	writeb(!!value << offset, chip->base + (1 << (offset + 2)));
+}
+
+static struct gpio_ops pl061_gpio_ops = {
+	.direction_input = pl061_direction_input,
+	.direction_output = pl061_direction_output,
+	.get = pl061_get_value,
+	.set = pl061_set_value,
+};
+
+static int pl061_probe(struct amba_device *dev, const struct amba_id *id)
+{
+	struct pl061_platform_data *pdata;
+	struct pl061_gpio *chip;
+	int ret, i;
+
+	chip = xzalloc(sizeof(*chip));
+
+	pdata = dev->dev.platform_data;
+	if (pdata) {
+		chip->gc.base = pdata->gpio_base;
+	} else {
+		chip->gc.base = -1;
+	}
+
+	chip->base = amba_get_mem_region(dev);
+
+	chip->gc.ops = &pl061_gpio_ops;
+	chip->gc.ngpio = PL061_GPIO_NR;
+	chip->gc.dev = &dev->dev;
+
+	ret = gpiochip_add(&chip->gc);
+	if (ret) {
+		dev_err(&dev->dev, "couldn't add gpiochip\n");
+		goto free_mem;
+	}
+
+	writeb(0, chip->base + GPIOIE); /* disable irqs */
+
+	for (i = 0; i < PL061_GPIO_NR; i++) {
+		if (pdata) {
+			if (pdata->directions & (1 << i))
+				pl061_direction_output(&chip->gc, i,
+						pdata->values & (1 << i));
+			else
+				pl061_direction_input(&chip->gc, i);
+		}
+	}
+
+	return 0;
+
+free_mem:
+	kfree(chip);
+
+	return ret;
+}
+
+static struct amba_id pl061_ids[] = {
+	{
+		.id	= 0x00041061,
+		.mask	= 0x000fffff,
+	},
+	{ 0, 0 },
+};
+
+static struct amba_driver pl061_gpio_driver = {
+	.drv = {
+		.name	= "pl061_gpio",
+	},
+	.id_table	= pl061_ids,
+	.probe		= pl061_probe,
+};
+
+static int __init pl061_gpio_init(void)
+{
+	return amba_driver_register(&pl061_gpio_driver);
+}
+coredevice_initcall(pl061_gpio_init);
+
+MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
+MODULE_DESCRIPTION("PL061 GPIO driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/amba/pl061.h b/include/linux/amba/pl061.h
new file mode 100644
index 0000000..fb83c04
--- /dev/null
+++ b/include/linux/amba/pl061.h
@@ -0,0 +1,16 @@
+#include <linux/types.h>
+
+/* platform data for the PL061 GPIO driver */
+
+struct pl061_platform_data {
+	/* number of the first GPIO */
+	unsigned	gpio_base;
+
+	/* number of the first IRQ.
+	 * If the IRQ functionality in not desired this must be set to 0.
+	 */
+	unsigned	irq_base;
+
+	u8		directions;	/* startup directions, 1: out, 0: in */
+	u8		values;		/* startup values */
+};
-- 
1.7.10.4


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[PATCH 4/4] versatilepb: add gpio support

[Jean-Christophe PLAGNIOL-VILLARD]

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
 arch/arm/configs/versatilepb_defconfig      |    2 ++
 arch/arm/mach-versatile/core.c              |   10 ++++++++++
 arch/arm/mach-versatile/include/mach/gpio.h |    1 +
 3 files changed, 13 insertions(+)
 create mode 100644 arch/arm/mach-versatile/include/mach/gpio.h

diff --git a/arch/arm/configs/versatilepb_defconfig b/arch/arm/configs/versatilepb_defconfig
index 87aec4d..4c71c3c 100644
--- a/arch/arm/configs/versatilepb_defconfig
+++ b/arch/arm/configs/versatilepb_defconfig
@@ -32,6 +32,7 @@ CONFIG_CMD_RESET=y
 CONFIG_CMD_GO=y
 CONFIG_CMD_TIMEOUT=y
 CONFIG_CMD_PARTITION=y
+CONFIG_CMD_GPIO=y
 CONFIG_CMD_UNCOMPRESS=y
 CONFIG_NET=y
 CONFIG_NET_DHCP=y
@@ -43,6 +44,7 @@ CONFIG_NET_NETCONSOLE=y
 CONFIG_NET_RESOLV=y
 CONFIG_SERIAL_AMBA_PL011=y
 CONFIG_DRIVER_NET_SMC91111=y
+CONFIG_GPIO_PL061=y
 CONFIG_FS_CRAMFS=y
 CONFIG_SHA1=y
 CONFIG_SHA256=y
diff --git a/arch/arm/mach-versatile/core.c b/arch/arm/mach-versatile/core.c
index 5c75e11..6e913df 100644
--- a/arch/arm/mach-versatile/core.c
+++ b/arch/arm/mach-versatile/core.c
@@ -196,3 +196,13 @@ void __noreturn reset_cpu (unsigned long ignored)
 	while(1);
 }
 EXPORT_SYMBOL(reset_cpu);
+
+static int versatile_init(void)
+{
+	amba_apb_device_add(NULL, "pl061_gpio", 0, 0x101e4000, 4096, NULL, 0);
+	amba_apb_device_add(NULL, "pl061_gpio", 1, 0x101e5000, 4096, NULL, 0);
+	amba_apb_device_add(NULL, "pl061_gpio", 2, 0x101e6000, 4096, NULL, 0);
+	amba_apb_device_add(NULL, "pl061_gpio", 3, 0x101e7000, 4096, NULL, 0);
+	return 0;
+}
+coredevice_initcall(versatile_init);
diff --git a/arch/arm/mach-versatile/include/mach/gpio.h b/arch/arm/mach-versatile/include/mach/gpio.h
new file mode 100644
index 0000000..306ab4c
--- /dev/null
+++ b/arch/arm/mach-versatile/include/mach/gpio.h
@@ -0,0 +1 @@
+#include <asm-generic/gpio.h>
-- 
1.7.10.4


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Re: [PATCH 2/4] gpio: provide generic gpio header

[Sascha Hauer]

On Fri, Oct 05, 2012 at 01:18:41PM +0200, Jean-Christophe PLAGNIOL-VILLARD wrote:
> Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
> ---
>  include/asm-generic/gpio.h |   10 ++++++++++
>  1 file changed, 10 insertions(+)
>  create mode 100644 include/asm-generic/gpio.h
> 
> diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
> new file mode 100644
> index 0000000..1997888
> --- /dev/null
> +++ b/include/asm-generic/gpio.h
> @@ -0,0 +1,10 @@
> +#ifndef __ASM_GENERIC_GPIO_H
> +#define __ASM_GENERIC_GPIO_H
> +
> +void gpio_set_value(unsigned gpio, int value);
> +int gpio_get_value(unsigned gpio);
> +int gpio_direction_output(unsigned gpio, int value);
> +int gpio_direction_input(unsigned gpio);
> +
> +#endif /* __ASM_GENERIC_GPIO_H */
> +

No newline at end of file please.

Since you are adding a generic file, which is good, could you also
cleanup the potential users?

./arch/arm/mach-at91/include/mach/gpio.h
./arch/arm/mach-mxs/include/mach/gpio.h
./arch/arm/mach-imx/include/mach/gpio.h
./arch/arm/mach-pxa/include/plat/gpio.h
./arch/arm/mach-pxa/include/mach/gpio.h
./arch/arm/mach-samsung/include/mach/gpio.h
./arch/arm/mach-ep93xx/include/mach/gpio.h
./arch/arm/mach-omap/include/mach/gpio.h

Sascha

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Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

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Re: [PATCH 3/4] gpio: add ARM Primcell pl061 support

[Sascha Hauer]

On Fri, Oct 05, 2012 at 01:18:42PM +0200, Jean-Christophe PLAGNIOL-VILLARD wrote:
> +
> +	ret = gpiochip_add(&chip->gc);
> +	if (ret) {
> +		dev_err(&dev->dev, "couldn't add gpiochip\n");

Print error value?

> +		goto free_mem;
> +	}
> +
> +	writeb(0, chip->base + GPIOIE); /* disable irqs */
> +
> +	for (i = 0; i < PL061_GPIO_NR; i++) {
> +		if (pdata) {
> +			if (pdata->directions & (1 << i))
> +				pl061_direction_output(&chip->gc, i,
> +						pdata->values & (1 << i));
> +			else
> +				pl061_direction_input(&chip->gc, i);

I don't think a gpio driver should alter the directions without being
asked. Just leave the directions untouched without platform_data.

> +
> +MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
> +MODULE_DESCRIPTION("PL061 GPIO driver");
> +MODULE_LICENSE("GPL");
> diff --git a/include/linux/amba/pl061.h b/include/linux/amba/pl061.h
> new file mode 100644
> index 0000000..fb83c04
> --- /dev/null
> +++ b/include/linux/amba/pl061.h
> @@ -0,0 +1,16 @@
> +#include <linux/types.h>
> +
> +/* platform data for the PL061 GPIO driver */
> +
> +struct pl061_platform_data {
> +	/* number of the first GPIO */
> +	unsigned	gpio_base;
> +
> +	/* number of the first IRQ.
> +	 * If the IRQ functionality in not desired this must be set to 0.
> +	 */
> +	unsigned	irq_base;
> +
> +	u8		directions;	/* startup directions, 1: out, 0: in */
> +	u8		values;		/* startup values */
> +};

include file protection?

Sascha

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Pengutronix e.K.                           |                             |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |
Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

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[PATCH 3/4] gpio: add ARM Primcell pl061 support

[Jean-Christophe PLAGNIOL-VILLARD]

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
 drivers/gpio/Kconfig       |    6 ++
 drivers/gpio/Makefile      |    2 +
 drivers/gpio/gpio-pl061.c  |  158 ++++++++++++++++++++++++++++++++++++++++++++
 include/linux/amba/pl061.h |   12 ++++
 4 files changed, 178 insertions(+)
 create mode 100644 drivers/gpio/gpio-pl061.c
 create mode 100644 include/linux/amba/pl061.h

diff --git a/drivers/gpio/Kconfig b/drivers/gpio/Kconfig
index f03fbf6..a0e9b58 100644
--- a/drivers/gpio/Kconfig
+++ b/drivers/gpio/Kconfig
@@ -6,6 +6,12 @@ if GPIOLIB
 
 menu "GPIO                          "
 
+config GPIO_PL061
+	bool "PrimeCell PL061 GPIO support"
+	depends on ARM_AMBA
+	help
+	  Say yes here to support the PrimeCell PL061 GPIO device
+
 config GPIO_STMPE
 	depends on I2C_STMPE
 	bool "STMPE GPIO Expander"
diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 945122b..e2e97d3 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -1,2 +1,4 @@
 obj-$(CONFIG_GPIOLIB) += gpio.o
+
+obj-$(CONFIG_GPIO_PL061)	+= gpio-pl061.o
 obj-$(CONFIG_GPIO_STMPE) += gpio-stmpe.o
diff --git a/drivers/gpio/gpio-pl061.c b/drivers/gpio/gpio-pl061.c
new file mode 100644
index 0000000..f34aba9
--- /dev/null
+++ b/drivers/gpio/gpio-pl061.c
@@ -0,0 +1,158 @@
+/*
+ * Copyright (C) 2008, 2009 Provigent Ltd.
+ *
+ * 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.
+ *
+ * Driver for the ARM PrimeCell(tm) General Purpose Input/Output (PL061)
+ *
+ * Data sheet: ARM DDI 0190B, September 2000
+ */
+#include <common.h>
+#include <malloc.h>
+#include <errno.h>
+#include <io.h>
+#include <gpio.h>
+#include <init.h>
+
+#include <linux/amba/bus.h>
+#include <linux/amba/pl061.h>
+
+#define GPIODIR 0x400
+#define GPIOIS  0x404
+#define GPIOIBE 0x408
+#define GPIOIEV 0x40C
+#define GPIOIE  0x410
+#define GPIORIS 0x414
+#define GPIOMIS 0x418
+#define GPIOIC  0x41C
+
+#define PL061_GPIO_NR	8
+
+struct pl061_gpio {
+	void __iomem		*base;
+	struct gpio_chip	gc;
+};
+
+static int pl061_direction_input(struct gpio_chip *gc, unsigned offset)
+{
+	struct pl061_gpio *chip = container_of(gc, struct pl061_gpio, gc);
+	unsigned char gpiodir;
+
+	if (offset >= gc->ngpio)
+		return -EINVAL;
+
+	gpiodir = readb(chip->base + GPIODIR);
+	gpiodir &= ~(1 << offset);
+	writeb(gpiodir, chip->base + GPIODIR);
+
+	return 0;
+}
+
+static int pl061_direction_output(struct gpio_chip *gc, unsigned offset,
+		int value)
+{
+	struct pl061_gpio *chip = container_of(gc, struct pl061_gpio, gc);
+	unsigned char gpiodir;
+
+	if (offset >= gc->ngpio)
+		return -EINVAL;
+
+	writeb(!!value << offset, chip->base + (1 << (offset + 2)));
+	gpiodir = readb(chip->base + GPIODIR);
+	gpiodir |= 1 << offset;
+	writeb(gpiodir, chip->base + GPIODIR);
+
+	/*
+	 * gpio value is set again, because pl061 doesn't allow to set value of
+	 * a gpio pin before configuring it in OUT mode.
+	 */
+	writeb(!!value << offset, chip->base + (1 << (offset + 2)));
+
+	return 0;
+}
+
+static int pl061_get_value(struct gpio_chip *gc, unsigned offset)
+{
+	struct pl061_gpio *chip = container_of(gc, struct pl061_gpio, gc);
+
+	return !!readb(chip->base + (1 << (offset + 2)));
+}
+
+static void pl061_set_value(struct gpio_chip *gc, unsigned offset, int value)
+{
+	struct pl061_gpio *chip = container_of(gc, struct pl061_gpio, gc);
+
+	writeb(!!value << offset, chip->base + (1 << (offset + 2)));
+}
+
+static struct gpio_ops pl061_gpio_ops = {
+	.direction_input = pl061_direction_input,
+	.direction_output = pl061_direction_output,
+	.get = pl061_get_value,
+	.set = pl061_set_value,
+};
+
+static int pl061_probe(struct amba_device *dev, const struct amba_id *id)
+{
+	struct pl061_platform_data *pdata;
+	struct pl061_gpio *chip;
+	int ret;
+
+	chip = xzalloc(sizeof(*chip));
+
+	pdata = dev->dev.platform_data;
+	if (pdata) {
+		chip->gc.base = pdata->gpio_base;
+	} else {
+		chip->gc.base = -1;
+	}
+
+	chip->base = amba_get_mem_region(dev);
+
+	chip->gc.ops = &pl061_gpio_ops;
+	chip->gc.ngpio = PL061_GPIO_NR;
+	chip->gc.dev = &dev->dev;
+
+	ret = gpiochip_add(&chip->gc);
+	if (ret) {
+		dev_err(&dev->dev, "couldn't add gpiochip, ret = %d\n", ret);
+		goto free_mem;
+	}
+
+	writeb(0, chip->base + GPIOIE); /* disable irqs */
+
+	return 0;
+
+free_mem:
+	kfree(chip);
+
+	return ret;
+}
+
+static struct amba_id pl061_ids[] = {
+	{
+		.id	= 0x00041061,
+		.mask	= 0x000fffff,
+	},
+	{ 0, 0 },
+};
+
+static struct amba_driver pl061_gpio_driver = {
+	.drv = {
+		.name	= "pl061_gpio",
+	},
+	.id_table	= pl061_ids,
+	.probe		= pl061_probe,
+};
+
+static int __init pl061_gpio_init(void)
+{
+	return amba_driver_register(&pl061_gpio_driver);
+}
+coredevice_initcall(pl061_gpio_init);
+
+MODULE_AUTHOR("Baruch Siach <baruch@tkos.co.il>");
+MODULE_DESCRIPTION("PL061 GPIO driver");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/amba/pl061.h b/include/linux/amba/pl061.h
new file mode 100644
index 0000000..d498cd7
--- /dev/null
+++ b/include/linux/amba/pl061.h
@@ -0,0 +1,12 @@
+#ifndef __AMBA_PL061_H__
+#define __AMBA_PL061_H__
+
+#include <linux/types.h>
+
+/* platform data for the PL061 GPIO driver */
+
+struct pl061_platform_data {
+	/* number of the first GPIO */
+	unsigned	gpio_base;
+};
+#endif /* __AMBA_PL061_H__ */
-- 
1.7.10.4


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