gpio: move U300 GPIO driver to drivers/gpio

This moves the U300 GPIO driver out of arch/arm/mach-u300 and into
the desired location indicated by the subsystem maintainer.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

2 files changed, 701 insertions, 0 deletions

diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index d92ce3a..27a2208 100644
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -34,6 +34,7 @@ obj-$(CONFIG_GPIO_WM831X)	+= wm831x-gpio.o
 obj-$(CONFIG_GPIO_WM8350)	+= wm8350-gpiolib.o
 obj-$(CONFIG_GPIO_WM8994)	+= wm8994-gpio.o
 obj-$(CONFIG_GPIO_SCH)		+= sch_gpio.o
+obj-$(CONFIG_MACH_U300)		+= gpio-u300.o
 obj-$(CONFIG_GPIO_RDC321X)	+= rdc321x-gpio.o
 obj-$(CONFIG_GPIO_JANZ_TTL)	+= janz-ttl.o
 obj-$(CONFIG_GPIO_SX150X)	+= sx150x.o
diff --git a/drivers/gpio/gpio-u300.c b/drivers/gpio/gpio-u300.c
new file mode 100644
index 0000000..d927901
--- /dev/null
+++ b/drivers/gpio/gpio-u300.c
@@ -0,0 +1,700 @@
+/*
+ *
+ * arch/arm/mach-u300/gpio.c
+ *
+ *
+ * Copyright (C) 2007-2009 ST-Ericsson AB
+ * License terms: GNU General Public License (GPL) version 2
+ * U300 GPIO module.
+ * This can driver either of the two basic GPIO cores
+ * available in the U300 platforms:
+ * COH 901 335   - Used in DB3150 (U300 1.0) and DB3200 (U330 1.0)
+ * COH 901 571/3 - Used in DB3210 (U365 2.0) and DB3350 (U335 1.0)
+ * Notice that you also have inline macros in <asm-arch/gpio.h>
+ * Author: Linus Walleij <linus.walleij@stericsson.com>
+ * Author: Jonas Aaberg <jonas.aberg@stericsson.com>
+ *
+ */
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+
+/* Reference to GPIO block clock */
+static struct clk *clk;
+
+/* Memory resource */
+static struct resource *memres;
+static void __iomem *virtbase;
+static struct device *gpiodev;
+
+struct u300_gpio_port {
+	const char *name;
+	int irq;
+	int number;
+};
+
+
+static struct u300_gpio_port gpio_ports[] = {
+	{
+		.name = "gpio0",
+		.number = 0,
+	},
+	{
+		.name = "gpio1",
+		.number = 1,
+	},
+	{
+		.name = "gpio2",
+		.number = 2,
+	},
+#ifdef U300_COH901571_3
+	{
+		.name = "gpio3",
+		.number = 3,
+	},
+	{
+		.name = "gpio4",
+		.number = 4,
+	},
+#ifdef CONFIG_MACH_U300_BS335
+	{
+		.name = "gpio5",
+		.number = 5,
+	},
+	{
+		.name = "gpio6",
+		.number = 6,
+	},
+#endif
+#endif
+
+};
+
+
+#ifdef U300_COH901571_3
+
+/* Default input value */
+#define DEFAULT_OUTPUT_LOW   0
+#define DEFAULT_OUTPUT_HIGH  1
+
+/* GPIO Pull-Up status */
+#define DISABLE_PULL_UP  0
+#define ENABLE_PULL_UP  1
+
+#define GPIO_NOT_USED 0
+#define GPIO_IN       1
+#define GPIO_OUT      2
+
+struct u300_gpio_configuration_data {
+	unsigned char pin_usage;
+	unsigned char default_output_value;
+	unsigned char pull_up;
+};
+
+/* Initial configuration */
+const struct u300_gpio_configuration_data
+u300_gpio_config[U300_GPIO_NUM_PORTS][U300_GPIO_PINS_PER_PORT] = {
+#ifdef CONFIG_MACH_U300_BS335
+	/* Port 0, pins 0-7 */
+	{
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_OUT, DEFAULT_OUTPUT_HIGH,  DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP}
+	},
+	/* Port 1, pins 0-7 */
+	{
+		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_OUT, DEFAULT_OUTPUT_HIGH,  DISABLE_PULL_UP},
+		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP}
+	},
+	/* Port 2, pins 0-7 */
+	{
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
+		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP}
+	},
+	/* Port 3, pins 0-7 */
+	{
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
+		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP}
+	},
+	/* Port 4, pins 0-7 */
+	{
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP}
+	},
+	/* Port 5, pins 0-7 */
+	{
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP}
+	},
+	/* Port 6, pind 0-7 */
+	{
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP}
+	}
+#endif
+
+#ifdef CONFIG_MACH_U300_BS365
+	/* Port 0, pins 0-7 */
+	{
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP}
+	},
+	/* Port 1, pins 0-7 */
+	{
+		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_OUT, DEFAULT_OUTPUT_HIGH,  DISABLE_PULL_UP},
+		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP}
+	},
+	/* Port 2, pins 0-7 */
+	{
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
+		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_OUT, DEFAULT_OUTPUT_LOW,   DISABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP}
+	},
+	/* Port 3, pins 0-7 */
+	{
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP}
+	},
+	/* Port 4, pins 0-7 */
+	{
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
+		{GPIO_IN,  DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
+		/* These 4 pins doesn't exist on DB3210 */
+		{GPIO_OUT, DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
+		{GPIO_OUT, DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
+		{GPIO_OUT, DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP},
+		{GPIO_OUT, DEFAULT_OUTPUT_LOW,    ENABLE_PULL_UP}
+	}
+#endif
+};
+#endif
+
+
+/* No users == we can power down GPIO */
+static int gpio_users;
+
+struct gpio_struct {
+	int (*callback)(void *);
+	void *data;
+	int users;
+};
+
+static struct gpio_struct gpio_pin[U300_GPIO_MAX];
+
+/*
+ * Let drivers register callback in order to get notified when there is
+ * an interrupt on the gpio pin
+ */
+int gpio_register_callback(unsigned gpio, int (*func)(void *arg), void *data)
+{
+	if (gpio_pin[gpio].callback)
+		dev_warn(gpiodev, "%s: WARNING: callback already "
+			 "registered for gpio pin#%d\n", __func__, gpio);
+	gpio_pin[gpio].callback = func;
+	gpio_pin[gpio].data = data;
+
+	return 0;
+}
+EXPORT_SYMBOL(gpio_register_callback);
+
+int gpio_unregister_callback(unsigned gpio)
+{
+	if (!gpio_pin[gpio].callback)
+		dev_warn(gpiodev, "%s: WARNING: callback already "
+			 "unregistered for gpio pin#%d\n", __func__, gpio);
+	gpio_pin[gpio].callback = NULL;
+	gpio_pin[gpio].data = NULL;
+
+	return 0;
+}
+EXPORT_SYMBOL(gpio_unregister_callback);
+
+/* Non-zero means valid */
+int gpio_is_valid(int number)
+{
+	if (number >= 0 &&
+	    number < (U300_GPIO_NUM_PORTS * U300_GPIO_PINS_PER_PORT))
+		return 1;
+	return 0;
+}
+EXPORT_SYMBOL(gpio_is_valid);
+
+int gpio_request(unsigned gpio, const char *label)
+{
+	if (gpio_pin[gpio].users)
+		return -EINVAL;
+	else
+		gpio_pin[gpio].users++;
+
+	gpio_users++;
+
+	return 0;
+}
+EXPORT_SYMBOL(gpio_request);
+
+void gpio_free(unsigned gpio)
+{
+	gpio_users--;
+	gpio_pin[gpio].users--;
+	if (unlikely(gpio_pin[gpio].users < 0)) {
+		dev_warn(gpiodev, "warning: gpio#%d release mismatch\n",
+			 gpio);
+		gpio_pin[gpio].users = 0;
+	}
+
+	return;
+}
+EXPORT_SYMBOL(gpio_free);
+
+/* This returns zero or nonzero */
+int gpio_get_value(unsigned gpio)
+{
+	return readl(virtbase + U300_GPIO_PXPDIR +
+	  PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING) & (1 << (gpio & 0x07));
+}
+EXPORT_SYMBOL(gpio_get_value);
+
+/*
+ * We hope that the compiler will optimize away the unused branch
+ * in case "value" is a constant
+ */
+void gpio_set_value(unsigned gpio, int value)
+{
+	u32 val;
+	unsigned long flags;
+
+	local_irq_save(flags);
+	if (value) {
+		/* set */
+		val = readl(virtbase + U300_GPIO_PXPDOR +
+		  PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING)
+		  & (1 << (gpio & 0x07));
+		writel(val | (1 << (gpio & 0x07)), virtbase +
+		  U300_GPIO_PXPDOR +
+		  PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING);
+	} else {
+		/* clear */
+		val = readl(virtbase + U300_GPIO_PXPDOR +
+		  PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING)
+		  & (1 << (gpio & 0x07));
+		writel(val & ~(1 << (gpio & 0x07)), virtbase +
+		  U300_GPIO_PXPDOR +
+		  PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING);
+	}
+	local_irq_restore(flags);
+}
+EXPORT_SYMBOL(gpio_set_value);
+
+int gpio_direction_input(unsigned gpio)
+{
+	unsigned long flags;
+	u32 val;
+
+	if (gpio > U300_GPIO_MAX)
+		return -EINVAL;
+
+	local_irq_save(flags);
+	val = readl(virtbase + U300_GPIO_PXPCR + PIN_TO_PORT(gpio) *
+				U300_GPIO_PORTX_SPACING);
+	/* Mask out this pin*/
+	val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK << ((gpio & 0x07) << 1));
+	/* This is not needed since it sets the bits to zero.*/
+	/* val |= (U300_GPIO_PXPCR_PIN_MODE_INPUT << (gpio*2)); */
+	writel(val, virtbase + U300_GPIO_PXPCR + PIN_TO_PORT(gpio) *
+				U300_GPIO_PORTX_SPACING);
+	local_irq_restore(flags);
+	return 0;
+}
+EXPORT_SYMBOL(gpio_direction_input);
+
+int gpio_direction_output(unsigned gpio, int value)
+{
+	unsigned long flags;
+	u32 val;
+
+	if (gpio > U300_GPIO_MAX)
+		return -EINVAL;
+
+	local_irq_save(flags);
+	val = readl(virtbase + U300_GPIO_PXPCR + PIN_TO_PORT(gpio) *
+				U300_GPIO_PORTX_SPACING);
+	/* Mask out this pin */
+	val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK << ((gpio & 0x07) << 1));
+	/*
+	 * FIXME: configure for push/pull, open drain or open source per pin
+	 * in setup. The current driver will only support push/pull.
+	 */
+	val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL
+			<< ((gpio & 0x07) << 1));
+	writel(val, virtbase + U300_GPIO_PXPCR + PIN_TO_PORT(gpio) *
+				U300_GPIO_PORTX_SPACING);
+	gpio_set_value(gpio, value);
+	local_irq_restore(flags);
+	return 0;
+}
+EXPORT_SYMBOL(gpio_direction_output);
+
+/*
+ * Enable an IRQ, edge is rising edge (!= 0) or falling edge (==0).
+ */
+void enable_irq_on_gpio_pin(unsigned gpio, int edge)
+{
+	u32 val;
+	unsigned long flags;
+	local_irq_save(flags);
+
+	val = readl(virtbase + U300_GPIO_PXIEN + PIN_TO_PORT(gpio) *
+				U300_GPIO_PORTX_SPACING);
+	val |= (1 << (gpio & 0x07));
+	writel(val, virtbase + U300_GPIO_PXIEN + PIN_TO_PORT(gpio) *
+				U300_GPIO_PORTX_SPACING);
+	val = readl(virtbase + U300_GPIO_PXICR + PIN_TO_PORT(gpio) *
+				U300_GPIO_PORTX_SPACING);
+	if (edge)
+		val |= (1 << (gpio & 0x07));
+	else
+		val &= ~(1 << (gpio & 0x07));
+	writel(val, virtbase + U300_GPIO_PXICR + PIN_TO_PORT(gpio) *
+				U300_GPIO_PORTX_SPACING);
+	local_irq_restore(flags);
+}
+EXPORT_SYMBOL(enable_irq_on_gpio_pin);
+
+void disable_irq_on_gpio_pin(unsigned gpio)
+{
+	u32 val;
+	unsigned long flags;
+
+	local_irq_save(flags);
+	val = readl(virtbase + U300_GPIO_PXIEN + PIN_TO_PORT(gpio) *
+				U300_GPIO_PORTX_SPACING);
+	val &= ~(1 << (gpio & 0x07));
+	writel(val, virtbase + U300_GPIO_PXIEN + PIN_TO_PORT(gpio) *
+				U300_GPIO_PORTX_SPACING);
+	local_irq_restore(flags);
+}
+EXPORT_SYMBOL(disable_irq_on_gpio_pin);
+
+/* Enable (value == 0) or disable (value == 1) internal pullup */
+void gpio_pullup(unsigned gpio, int value)
+{
+	u32 val;
+	unsigned long flags;
+
+	local_irq_save(flags);
+	if (value) {
+		val = readl(virtbase + U300_GPIO_PXPER + PIN_TO_PORT(gpio) *
+					U300_GPIO_PORTX_SPACING);
+		writel(val | (1 << (gpio & 0x07)), virtbase + U300_GPIO_PXPER +
+				PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING);
+	} else {
+		val = readl(virtbase + U300_GPIO_PXPER + PIN_TO_PORT(gpio) *
+					U300_GPIO_PORTX_SPACING);
+		writel(val & ~(1 << (gpio & 0x07)), virtbase + U300_GPIO_PXPER +
+				PIN_TO_PORT(gpio) * U300_GPIO_PORTX_SPACING);
+	}
+	local_irq_restore(flags);
+}
+EXPORT_SYMBOL(gpio_pullup);
+
+static irqreturn_t gpio_irq_handler(int irq, void *dev_id)
+{
+	struct u300_gpio_port *port = dev_id;
+	u32 val;
+	int pin;
+
+	/* Read event register */
+	val = readl(virtbase + U300_GPIO_PXIEV + port->number *
+				U300_GPIO_PORTX_SPACING);
+	/* Mask with enable register */
+	val &= readl(virtbase + U300_GPIO_PXIEV + port->number *
+				U300_GPIO_PORTX_SPACING);
+	/* Mask relevant bits */
+	val &= U300_GPIO_PXIEV_ALL_IRQ_EVENT_MASK;
+	/* ACK IRQ (clear event) */
+	writel(val, virtbase + U300_GPIO_PXIEV + port->number *
+				U300_GPIO_PORTX_SPACING);
+	/* Print message */
+	while (val != 0) {
+		unsigned gpio;
+
+		pin = __ffs(val);
+		/* mask off this pin */
+		val &= ~(1 << pin);
+		gpio = (port->number << 3) + pin;
+
+		if (gpio_pin[gpio].callback)
+			(void)gpio_pin[gpio].callback(gpio_pin[gpio].data);
+		else
+			dev_dbg(gpiodev, "stray GPIO IRQ on line %d\n",
+			       gpio);
+	}
+	return IRQ_HANDLED;
+}
+
+static void gpio_set_initial_values(void)
+{
+#ifdef U300_COH901571_3
+	int i, j;
+	unsigned long flags;
+	u32 val;
+
+	/* Write default values to all pins */
+	for (i = 0; i < U300_GPIO_NUM_PORTS; i++) {
+		val = 0;
+		for (j = 0; j < 8; j++)
+			val |= (u32) (u300_gpio_config[i][j].default_output_value != DEFAULT_OUTPUT_LOW) << j;
+		local_irq_save(flags);
+		writel(val, virtbase + U300_GPIO_PXPDOR + i * U300_GPIO_PORTX_SPACING);
+		local_irq_restore(flags);
+	}
+
+	/*
+	 * Put all pins that are set to either 'GPIO_OUT' or 'GPIO_NOT_USED'
+	 * to output and 'GPIO_IN' to input for each port. And initialize
+	 * default value on outputs.
+	 */
+	for (i = 0; i < U300_GPIO_NUM_PORTS; i++) {
+		for (j = 0; j < U300_GPIO_PINS_PER_PORT; j++) {
+			local_irq_save(flags);
+			val = readl(virtbase + U300_GPIO_PXPCR +
+					 i * U300_GPIO_PORTX_SPACING);
+			/* Mask out this pin */
+			val &= ~(U300_GPIO_PXPCR_PIN_MODE_MASK << (j << 1));
+
+			if (u300_gpio_config[i][j].pin_usage != GPIO_IN)
+				val |= (U300_GPIO_PXPCR_PIN_MODE_OUTPUT_PUSH_PULL << (j << 1));
+			writel(val, virtbase + U300_GPIO_PXPCR +
+					 i * U300_GPIO_PORTX_SPACING);
+			local_irq_restore(flags);
+		}
+	}
+
+	/* Enable or disable the internal pull-ups in the GPIO ASIC block */
+	for (i = 0; i < U300_GPIO_MAX; i++) {
+		val = 0;
+		for (j = 0; j < 8; j++)
+			val |= (u32)((u300_gpio_config[i][j].pull_up == DISABLE_PULL_UP) << j);
+		local_irq_save(flags);
+		writel(val, virtbase + U300_GPIO_PXPER + i * U300_GPIO_PORTX_SPACING);
+		local_irq_restore(flags);
+	}
+#endif
+}
+
+static int __init gpio_probe(struct platform_device *pdev)
+{
+	u32 val;
+	int err = 0;
+	int i;
+	int num_irqs;
+
+	gpiodev = &pdev->dev;
+	memset(gpio_pin, 0, sizeof(gpio_pin));
+
+	/* Get GPIO clock */
+	clk = clk_get(&pdev->dev, NULL);
+	if (IS_ERR(clk)) {
+		err = PTR_ERR(clk);
+		dev_err(gpiodev, "could not get GPIO clock\n");
+		goto err_no_clk;
+	}
+	err = clk_enable(clk);
+	if (err) {
+		dev_err(gpiodev, "could not enable GPIO clock\n");
+		goto err_no_clk_enable;
+	}
+
+	memres = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!memres)
+		goto err_no_resource;
+
+	if (request_mem_region(memres->start, memres->end - memres->start, "GPIO Controller")
+	    == NULL) {
+		err = -ENODEV;
+		goto err_no_ioregion;
+	}
+
+	virtbase = ioremap(memres->start, resource_size(memres));
+	if (!virtbase) {
+		err = -ENOMEM;
+		goto err_no_ioremap;
+	}
+	dev_info(gpiodev, "remapped 0x%08x to %p\n",
+		 memres->start, virtbase);
+
+#ifdef U300_COH901335
+	dev_info(gpiodev, "initializing GPIO Controller COH 901 335\n");
+	/* Turn on the GPIO block */
+	writel(U300_GPIO_CR_BLOCK_CLOCK_ENABLE, virtbase + U300_GPIO_CR);
+#endif
+
+#ifdef U300_COH901571_3
+	dev_info(gpiodev, "initializing GPIO Controller COH 901 571/3\n");
+	val = readl(virtbase + U300_GPIO_CR);
+	dev_info(gpiodev, "COH901571/3 block version: %d, " \
+	       "number of cores: %d\n",
+	       ((val & 0x0000FE00) >> 9),
+	       ((val & 0x000001FC) >> 2));
+	writel(U300_GPIO_CR_BLOCK_CLKRQ_ENABLE, virtbase + U300_GPIO_CR);
+#endif
+
+	gpio_set_initial_values();
+
+	for (num_irqs = 0 ; num_irqs < U300_GPIO_NUM_PORTS; num_irqs++) {
+
+		gpio_ports[num_irqs].irq =
+			platform_get_irq_byname(pdev,
+						gpio_ports[num_irqs].name);
+
+		err = request_irq(gpio_ports[num_irqs].irq,
+				  gpio_irq_handler, IRQF_DISABLED,
+				  gpio_ports[num_irqs].name,
+				  &gpio_ports[num_irqs]);
+		if (err) {
+			dev_err(gpiodev, "cannot allocate IRQ for %s!\n",
+				gpio_ports[num_irqs].name);
+			goto err_no_irq;
+		}
+		/* Turns off PortX_irq_force */
+		writel(0x0, virtbase + U300_GPIO_PXIFR +
+				 num_irqs * U300_GPIO_PORTX_SPACING);
+	}
+
+	return 0;
+
+ err_no_irq:
+	for (i = 0; i < num_irqs; i++)
+		free_irq(gpio_ports[i].irq, &gpio_ports[i]);
+	iounmap(virtbase);
+ err_no_ioremap:
+	release_mem_region(memres->start, memres->end - memres->start);
+ err_no_ioregion:
+ err_no_resource:
+	clk_disable(clk);
+ err_no_clk_enable:
+	clk_put(clk);
+ err_no_clk:
+	dev_info(gpiodev, "module ERROR:%d\n", err);
+	return err;
+}
+
+static int __exit gpio_remove(struct platform_device *pdev)
+{
+	int i;
+
+	/* Turn off the GPIO block */
+	writel(0x00000000U, virtbase + U300_GPIO_CR);
+	for (i = 0 ; i < U300_GPIO_NUM_PORTS; i++)
+		free_irq(gpio_ports[i].irq, &gpio_ports[i]);
+	iounmap(virtbase);
+	release_mem_region(memres->start, memres->end - memres->start);
+	clk_disable(clk);
+	clk_put(clk);
+	return 0;
+}
+
+static struct platform_driver gpio_driver = {
+	.driver		= {
+		.name	= "u300-gpio",
+	},
+	.remove		= __exit_p(gpio_remove),
+};
+
+
+static int __init u300_gpio_init(void)
+{
+	return platform_driver_probe(&gpio_driver, gpio_probe);
+}
+
+static void __exit u300_gpio_exit(void)
+{
+	platform_driver_unregister(&gpio_driver);
+}
+
+arch_initcall(u300_gpio_init);
+module_exit(u300_gpio_exit);
+
+MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
+
+#ifdef U300_COH901571_3
+MODULE_DESCRIPTION("ST-Ericsson AB COH 901 571/3 GPIO driver");
+#endif
+
+#ifdef U300_COH901335
+MODULE_DESCRIPTION("ST-Ericsson AB COH 901 335 GPIO driver");
+#endif
+
+MODULE_LICENSE("GPL");