[ARM] 5471/2: U300 GPIO and PADMUX support

This adds GPIO and PADMUX headers and implementation for
the U300 platform. This is an implementation in isolation
that depend on later patches in this series to plug into
the framework.

Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 701 insertions, 0 deletions

diff --git a/arch/arm/mach-u300/gpio.c b/arch/arm/mach-u300/gpio.c
new file mode 100644
index 000000000000..2d5ae8ecb8c8
--- /dev/null
+++ b/arch/arm/mach-u300/gpio.c
@@ -0,0 +1,701 @@
+/*
+ *
+ * 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>
+
+/* Need access to SYSCON registers for PADmuxing */
+#include <mach/syscon.h>
+
+#include "padmux.h"
+
+/* Reference to GPIO block clock */
+static struct clk *clk;
+
+/* Memory resource */
+static struct resource *memres;
+static void __iomem *virtbase;
+
+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)
+		printk(KERN_WARNING "GPIO: %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)
+		printk(KERN_WARNING "GPIO: %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);
+
+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)) {
+		printk(KERN_WARNING "GPIO: 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
+			printk(KERN_DEBUG "GPIO: 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 initalize
+	 * 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 __devinit gpio_probe(struct platform_device *pdev)
+{
+	u32 val;
+	int err = 0;
+	int i;
+	int num_irqs;
+
+	memset(gpio_pin, 0, sizeof(gpio_pin));
+
+	/* Get GPIO clock */
+	clk = clk_get(&pdev->dev, NULL);
+	if (IS_ERR(clk)) {
+		err = PTR_ERR(clk);
+		printk(KERN_ERR "GPIO: could not get GPIO clock\n");
+		goto err_no_clk;
+	}
+	err = clk_enable(clk);
+	if (err) {
+		printk(KERN_ERR "GPIO: 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, memres->end - memres->start + 1);
+	if (!virtbase) {
+		err = -ENOMEM;
+		goto err_no_ioremap;
+	}
+
+#ifdef U300_COH901335
+	printk(KERN_INFO "GPIO: 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
+	printk(KERN_INFO "GPIO: Initializing GPIO Controller COH 901 571/3\n");
+	val = readl(virtbase + U300_GPIO_CR);
+	printk(KERN_INFO "GPIO: 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
+
+	/* Set up some padmuxing here */
+#ifdef CONFIG_MMC
+	pmx_set_mission_mode_mmc();
+#endif
+#ifdef CONFIG_SPI_PL022
+	pmx_set_mission_mode_spi();
+#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) {
+			printk(KERN_CRIT "GPIO: 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);
+	}
+	printk(KERN_INFO "GPIO: U300 gpio module loaded\n");
+
+	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:
+	printk(KERN_INFO "GPIO: module ERROR:%d\n", err);
+	return err;
+}
+
+static int __devexit 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",
+	},
+	.probe		= gpio_probe,
+	.remove		= __devexit_p(gpio_remove),
+};
+
+
+static int __init u300_gpio_init(void)
+{
+	return platform_driver_register(&gpio_driver);
+}
+
+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");