[PATCH] ARM: 2812/1: OMAP update 7c/11: Move arch-omap to plat-omap

Patch from Tony Lindgren

This patch move common OMAP code from arch-omap to plat-omap
directory.

Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 762 insertions, 0 deletions

diff --git a/arch/arm/plat-omap/gpio.c b/arch/arm/plat-omap/gpio.c
new file mode 100644
index 000000000000..1c85b4e536c2
--- /dev/null
+++ b/arch/arm/plat-omap/gpio.c
@@ -0,0 +1,762 @@
+/*
+ *  linux/arch/arm/plat-omap/gpio.c
+ *
+ * Support functions for OMAP GPIO
+ *
+ * Copyright (C) 2003 Nokia Corporation
+ * Written by Juha Yrj�l� <juha.yrjola@nokia.com>
+ *
+ * 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.
+ */
+
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/ptrace.h>
+
+#include <asm/hardware.h>
+#include <asm/irq.h>
+#include <asm/arch/irqs.h>
+#include <asm/arch/gpio.h>
+#include <asm/mach/irq.h>
+
+#include <asm/io.h>
+
+/*
+ * OMAP1510 GPIO registers
+ */
+#define OMAP1510_GPIO_BASE		0xfffce000
+#define OMAP1510_GPIO_DATA_INPUT	0x00
+#define OMAP1510_GPIO_DATA_OUTPUT	0x04
+#define OMAP1510_GPIO_DIR_CONTROL	0x08
+#define OMAP1510_GPIO_INT_CONTROL	0x0c
+#define OMAP1510_GPIO_INT_MASK		0x10
+#define OMAP1510_GPIO_INT_STATUS	0x14
+#define OMAP1510_GPIO_PIN_CONTROL	0x18
+
+#define OMAP1510_IH_GPIO_BASE		64
+
+/*
+ * OMAP1610 specific GPIO registers
+ */
+#define OMAP1610_GPIO1_BASE		0xfffbe400
+#define OMAP1610_GPIO2_BASE		0xfffbec00
+#define OMAP1610_GPIO3_BASE		0xfffbb400
+#define OMAP1610_GPIO4_BASE		0xfffbbc00
+#define OMAP1610_GPIO_REVISION		0x0000
+#define OMAP1610_GPIO_SYSCONFIG		0x0010
+#define OMAP1610_GPIO_SYSSTATUS		0x0014
+#define OMAP1610_GPIO_IRQSTATUS1	0x0018
+#define OMAP1610_GPIO_IRQENABLE1	0x001c
+#define OMAP1610_GPIO_DATAIN		0x002c
+#define OMAP1610_GPIO_DATAOUT		0x0030
+#define OMAP1610_GPIO_DIRECTION		0x0034
+#define OMAP1610_GPIO_EDGE_CTRL1	0x0038
+#define OMAP1610_GPIO_EDGE_CTRL2	0x003c
+#define OMAP1610_GPIO_CLEAR_IRQENABLE1	0x009c
+#define OMAP1610_GPIO_CLEAR_DATAOUT	0x00b0
+#define OMAP1610_GPIO_SET_IRQENABLE1	0x00dc
+#define OMAP1610_GPIO_SET_DATAOUT	0x00f0
+
+/*
+ * OMAP730 specific GPIO registers
+ */
+#define OMAP730_GPIO1_BASE		0xfffbc000
+#define OMAP730_GPIO2_BASE		0xfffbc800
+#define OMAP730_GPIO3_BASE		0xfffbd000
+#define OMAP730_GPIO4_BASE		0xfffbd800
+#define OMAP730_GPIO5_BASE		0xfffbe000
+#define OMAP730_GPIO6_BASE		0xfffbe800
+#define OMAP730_GPIO_DATA_INPUT		0x00
+#define OMAP730_GPIO_DATA_OUTPUT	0x04
+#define OMAP730_GPIO_DIR_CONTROL	0x08
+#define OMAP730_GPIO_INT_CONTROL	0x0c
+#define OMAP730_GPIO_INT_MASK		0x10
+#define OMAP730_GPIO_INT_STATUS		0x14
+
+#define OMAP_MPUIO_MASK		(~OMAP_MAX_GPIO_LINES & 0xff)
+
+struct gpio_bank {
+	u32 base;
+	u16 irq;
+	u16 virtual_irq_start;
+	u8 method;
+	u32 reserved_map;
+	spinlock_t lock;
+};
+
+#define METHOD_MPUIO		0
+#define METHOD_GPIO_1510	1
+#define METHOD_GPIO_1610	2
+#define METHOD_GPIO_730		3
+
+#if defined(CONFIG_ARCH_OMAP16XX)
+static struct gpio_bank gpio_bank_1610[5] = {
+	{ OMAP_MPUIO_BASE,     INT_MPUIO,	    IH_MPUIO_BASE,     METHOD_MPUIO},
+	{ OMAP1610_GPIO1_BASE, INT_GPIO_BANK1,	    IH_GPIO_BASE,      METHOD_GPIO_1610 },
+	{ OMAP1610_GPIO2_BASE, INT_1610_GPIO_BANK2, IH_GPIO_BASE + 16, METHOD_GPIO_1610 },
+	{ OMAP1610_GPIO3_BASE, INT_1610_GPIO_BANK3, IH_GPIO_BASE + 32, METHOD_GPIO_1610 },
+	{ OMAP1610_GPIO4_BASE, INT_1610_GPIO_BANK4, IH_GPIO_BASE + 48, METHOD_GPIO_1610 },
+};
+#endif
+
+#ifdef CONFIG_ARCH_OMAP1510
+static struct gpio_bank gpio_bank_1510[2] = {
+	{ OMAP_MPUIO_BASE,    INT_MPUIO,      IH_MPUIO_BASE, METHOD_MPUIO },
+	{ OMAP1510_GPIO_BASE, INT_GPIO_BANK1, IH_GPIO_BASE,  METHOD_GPIO_1510 }
+};
+#endif
+
+#ifdef CONFIG_ARCH_OMAP730
+static struct gpio_bank gpio_bank_730[7] = {
+	{ OMAP_MPUIO_BASE,     INT_730_MPUIO,	    IH_MPUIO_BASE,	METHOD_MPUIO },
+	{ OMAP730_GPIO1_BASE,  INT_730_GPIO_BANK1,  IH_GPIO_BASE,	METHOD_GPIO_730 },
+	{ OMAP730_GPIO2_BASE,  INT_730_GPIO_BANK2,  IH_GPIO_BASE + 32,	METHOD_GPIO_730 },
+	{ OMAP730_GPIO3_BASE,  INT_730_GPIO_BANK3,  IH_GPIO_BASE + 64,	METHOD_GPIO_730 },
+	{ OMAP730_GPIO4_BASE,  INT_730_GPIO_BANK4,  IH_GPIO_BASE + 96,	METHOD_GPIO_730 },
+	{ OMAP730_GPIO5_BASE,  INT_730_GPIO_BANK5,  IH_GPIO_BASE + 128, METHOD_GPIO_730 },
+	{ OMAP730_GPIO6_BASE,  INT_730_GPIO_BANK6,  IH_GPIO_BASE + 160, METHOD_GPIO_730 },
+};
+#endif
+
+static struct gpio_bank *gpio_bank;
+static int gpio_bank_count;
+
+static inline struct gpio_bank *get_gpio_bank(int gpio)
+{
+#ifdef CONFIG_ARCH_OMAP1510
+	if (cpu_is_omap1510()) {
+		if (OMAP_GPIO_IS_MPUIO(gpio))
+			return &gpio_bank[0];
+		return &gpio_bank[1];
+	}
+#endif
+#if defined(CONFIG_ARCH_OMAP16XX)
+	if (cpu_is_omap16xx()) {
+		if (OMAP_GPIO_IS_MPUIO(gpio))
+			return &gpio_bank[0];
+		return &gpio_bank[1 + (gpio >> 4)];
+	}
+#endif
+#ifdef CONFIG_ARCH_OMAP730
+	if (cpu_is_omap730()) {
+		if (OMAP_GPIO_IS_MPUIO(gpio))
+			return &gpio_bank[0];
+		return &gpio_bank[1 + (gpio >> 5)];
+	}
+#endif
+}
+
+static inline int get_gpio_index(int gpio)
+{
+	if (cpu_is_omap730())
+		return gpio & 0x1f;
+	else
+		return gpio & 0x0f;
+}
+
+static inline int gpio_valid(int gpio)
+{
+	if (gpio < 0)
+		return -1;
+	if (OMAP_GPIO_IS_MPUIO(gpio)) {
+		if ((gpio & OMAP_MPUIO_MASK) > 16)
+			return -1;
+		return 0;
+	}
+#ifdef CONFIG_ARCH_OMAP1510
+	if (cpu_is_omap1510() && gpio < 16)
+		return 0;
+#endif
+#if defined(CONFIG_ARCH_OMAP16XX)
+	if ((cpu_is_omap16xx()) && gpio < 64)
+		return 0;
+#endif
+#ifdef CONFIG_ARCH_OMAP730
+	if (cpu_is_omap730() && gpio < 192)
+		return 0;
+#endif
+	return -1;
+}
+
+static int check_gpio(int gpio)
+{
+	if (unlikely(gpio_valid(gpio)) < 0) {
+		printk(KERN_ERR "omap-gpio: invalid GPIO %d\n", gpio);
+		dump_stack();
+		return -1;
+	}
+	return 0;
+}
+
+static void _set_gpio_direction(struct gpio_bank *bank, int gpio, int is_input)
+{
+	u32 reg = bank->base;
+	u32 l;
+
+	switch (bank->method) {
+	case METHOD_MPUIO:
+		reg += OMAP_MPUIO_IO_CNTL;
+		break;
+	case METHOD_GPIO_1510:
+		reg += OMAP1510_GPIO_DIR_CONTROL;
+		break;
+	case METHOD_GPIO_1610:
+		reg += OMAP1610_GPIO_DIRECTION;
+		break;
+	case METHOD_GPIO_730:
+		reg += OMAP730_GPIO_DIR_CONTROL;
+		break;
+	}
+	l = __raw_readl(reg);
+	if (is_input)
+		l |= 1 << gpio;
+	else
+		l &= ~(1 << gpio);
+	__raw_writel(l, reg);
+}
+
+void omap_set_gpio_direction(int gpio, int is_input)
+{
+	struct gpio_bank *bank;
+
+	if (check_gpio(gpio) < 0)
+		return;
+	bank = get_gpio_bank(gpio);
+	spin_lock(&bank->lock);
+	_set_gpio_direction(bank, get_gpio_index(gpio), is_input);
+	spin_unlock(&bank->lock);
+}
+
+static void _set_gpio_dataout(struct gpio_bank *bank, int gpio, int enable)
+{
+	u32 reg = bank->base;
+	u32 l = 0;
+
+	switch (bank->method) {
+	case METHOD_MPUIO:
+		reg += OMAP_MPUIO_OUTPUT;
+		l = __raw_readl(reg);
+		if (enable)
+			l |= 1 << gpio;
+		else
+			l &= ~(1 << gpio);
+		break;
+	case METHOD_GPIO_1510:
+		reg += OMAP1510_GPIO_DATA_OUTPUT;
+		l = __raw_readl(reg);
+		if (enable)
+			l |= 1 << gpio;
+		else
+			l &= ~(1 << gpio);
+		break;
+	case METHOD_GPIO_1610:
+		if (enable)
+			reg += OMAP1610_GPIO_SET_DATAOUT;
+		else
+			reg += OMAP1610_GPIO_CLEAR_DATAOUT;
+		l = 1 << gpio;
+		break;
+	case METHOD_GPIO_730:
+		reg += OMAP730_GPIO_DATA_OUTPUT;
+		l = __raw_readl(reg);
+		if (enable)
+			l |= 1 << gpio;
+		else
+			l &= ~(1 << gpio);
+		break;
+	default:
+		BUG();
+		return;
+	}
+	__raw_writel(l, reg);
+}
+
+void omap_set_gpio_dataout(int gpio, int enable)
+{
+	struct gpio_bank *bank;
+
+	if (check_gpio(gpio) < 0)
+		return;
+	bank = get_gpio_bank(gpio);
+	spin_lock(&bank->lock);
+	_set_gpio_dataout(bank, get_gpio_index(gpio), enable);
+	spin_unlock(&bank->lock);
+}
+
+int omap_get_gpio_datain(int gpio)
+{
+	struct gpio_bank *bank;
+	u32 reg;
+
+	if (check_gpio(gpio) < 0)
+		return -1;
+	bank = get_gpio_bank(gpio);
+	reg = bank->base;
+	switch (bank->method) {
+	case METHOD_MPUIO:
+		reg += OMAP_MPUIO_INPUT_LATCH;
+		break;
+	case METHOD_GPIO_1510:
+		reg += OMAP1510_GPIO_DATA_INPUT;
+		break;
+	case METHOD_GPIO_1610:
+		reg += OMAP1610_GPIO_DATAIN;
+		break;
+	case METHOD_GPIO_730:
+		reg += OMAP730_GPIO_DATA_INPUT;
+		break;
+	default:
+		BUG();
+		return -1;
+	}
+	return (__raw_readl(reg) & (1 << get_gpio_index(gpio))) != 0;
+}
+
+static void _set_gpio_edge_ctrl(struct gpio_bank *bank, int gpio, int edge)
+{
+	u32 reg = bank->base;
+	u32 l;
+
+	switch (bank->method) {
+	case METHOD_MPUIO:
+		reg += OMAP_MPUIO_GPIO_INT_EDGE;
+		l = __raw_readl(reg);
+		if (edge == OMAP_GPIO_RISING_EDGE)
+			l |= 1 << gpio;
+		else
+			l &= ~(1 << gpio);
+		__raw_writel(l, reg);
+		break;
+	case METHOD_GPIO_1510:
+		reg += OMAP1510_GPIO_INT_CONTROL;
+		l = __raw_readl(reg);
+		if (edge == OMAP_GPIO_RISING_EDGE)
+			l |= 1 << gpio;
+		else
+			l &= ~(1 << gpio);
+		__raw_writel(l, reg);
+		break;
+	case METHOD_GPIO_1610:
+		edge &= 0x03;
+		if (gpio & 0x08)
+			reg += OMAP1610_GPIO_EDGE_CTRL2;
+		else
+			reg += OMAP1610_GPIO_EDGE_CTRL1;
+		gpio &= 0x07;
+		l = __raw_readl(reg);
+		l &= ~(3 << (gpio << 1));
+		l |= edge << (gpio << 1);
+		__raw_writel(l, reg);
+		break;
+	case METHOD_GPIO_730:
+		reg += OMAP730_GPIO_INT_CONTROL;
+		l = __raw_readl(reg);
+		if (edge == OMAP_GPIO_RISING_EDGE)
+			l |= 1 << gpio;
+		else
+			l &= ~(1 << gpio);
+		__raw_writel(l, reg);
+		break;
+	default:
+		BUG();
+		return;
+	}
+}
+
+void omap_set_gpio_edge_ctrl(int gpio, int edge)
+{
+	struct gpio_bank *bank;
+
+	if (check_gpio(gpio) < 0)
+		return;
+	bank = get_gpio_bank(gpio);
+	spin_lock(&bank->lock);
+	_set_gpio_edge_ctrl(bank, get_gpio_index(gpio), edge);
+	spin_unlock(&bank->lock);
+}
+
+
+static int _get_gpio_edge_ctrl(struct gpio_bank *bank, int gpio)
+{
+	u32 reg = bank->base, l;
+
+	switch (bank->method) {
+	case METHOD_MPUIO:
+		l = __raw_readl(reg + OMAP_MPUIO_GPIO_INT_EDGE);
+		return (l & (1 << gpio)) ?
+			OMAP_GPIO_RISING_EDGE : OMAP_GPIO_FALLING_EDGE;
+	case METHOD_GPIO_1510:
+		l = __raw_readl(reg + OMAP1510_GPIO_INT_CONTROL);
+		return (l & (1 << gpio)) ?
+			OMAP_GPIO_RISING_EDGE : OMAP_GPIO_FALLING_EDGE;
+	case METHOD_GPIO_1610:
+		if (gpio & 0x08)
+			reg += OMAP1610_GPIO_EDGE_CTRL2;
+		else
+			reg += OMAP1610_GPIO_EDGE_CTRL1;
+		return (__raw_readl(reg) >> ((gpio & 0x07) << 1)) & 0x03;
+	case METHOD_GPIO_730:
+		l = __raw_readl(reg + OMAP730_GPIO_INT_CONTROL);
+		return (l & (1 << gpio)) ?
+			OMAP_GPIO_RISING_EDGE : OMAP_GPIO_FALLING_EDGE;
+	default:
+		BUG();
+		return -1;
+	}
+}
+
+static void _clear_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
+{
+	u32 reg = bank->base;
+
+	switch (bank->method) {
+	case METHOD_MPUIO:
+		/* MPUIO irqstatus is reset by reading the status register,
+		 * so do nothing here */
+		return;
+	case METHOD_GPIO_1510:
+		reg += OMAP1510_GPIO_INT_STATUS;
+		break;
+	case METHOD_GPIO_1610:
+		reg += OMAP1610_GPIO_IRQSTATUS1;
+		break;
+	case METHOD_GPIO_730:
+		reg += OMAP730_GPIO_INT_STATUS;
+		break;
+	default:
+		BUG();
+		return;
+	}
+	__raw_writel(gpio_mask, reg);
+}
+
+static inline void _clear_gpio_irqstatus(struct gpio_bank *bank, int gpio)
+{
+	_clear_gpio_irqbank(bank, 1 << get_gpio_index(gpio));
+}
+
+static void _enable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask, int enable)
+{
+	u32 reg = bank->base;
+	u32 l;
+
+	switch (bank->method) {
+	case METHOD_MPUIO:
+		reg += OMAP_MPUIO_GPIO_MASKIT;
+		l = __raw_readl(reg);
+		if (enable)
+			l &= ~(gpio_mask);
+		else
+			l |= gpio_mask;
+		break;
+	case METHOD_GPIO_1510:
+		reg += OMAP1510_GPIO_INT_MASK;
+		l = __raw_readl(reg);
+		if (enable)
+			l &= ~(gpio_mask);
+		else
+			l |= gpio_mask;
+		break;
+	case METHOD_GPIO_1610:
+		if (enable)
+			reg += OMAP1610_GPIO_SET_IRQENABLE1;
+		else
+			reg += OMAP1610_GPIO_CLEAR_IRQENABLE1;
+		l = gpio_mask;
+		break;
+	case METHOD_GPIO_730:
+		reg += OMAP730_GPIO_INT_MASK;
+		l = __raw_readl(reg);
+		if (enable)
+			l &= ~(gpio_mask);
+		else
+			l |= gpio_mask;
+		break;
+	default:
+		BUG();
+		return;
+	}
+	__raw_writel(l, reg);
+}
+
+static inline void _set_gpio_irqenable(struct gpio_bank *bank, int gpio, int enable)
+{
+	_enable_gpio_irqbank(bank, 1 << get_gpio_index(gpio), enable);
+}
+
+int omap_request_gpio(int gpio)
+{
+	struct gpio_bank *bank;
+
+	if (check_gpio(gpio) < 0)
+		return -EINVAL;
+
+	bank = get_gpio_bank(gpio);
+	spin_lock(&bank->lock);
+	if (unlikely(bank->reserved_map & (1 << get_gpio_index(gpio)))) {
+		printk(KERN_ERR "omap-gpio: GPIO %d is already reserved!\n", gpio);
+		dump_stack();
+		spin_unlock(&bank->lock);
+		return -1;
+	}
+	bank->reserved_map |= (1 << get_gpio_index(gpio));
+#ifdef CONFIG_ARCH_OMAP1510
+	if (bank->method == METHOD_GPIO_1510) {
+		u32 reg;
+
+		/* Claim the pin for the ARM */
+		reg = bank->base + OMAP1510_GPIO_PIN_CONTROL;
+		__raw_writel(__raw_readl(reg) | (1 << get_gpio_index(gpio)), reg);
+	}
+#endif
+	spin_unlock(&bank->lock);
+
+	return 0;
+}
+
+void omap_free_gpio(int gpio)
+{
+	struct gpio_bank *bank;
+
+	if (check_gpio(gpio) < 0)
+		return;
+	bank = get_gpio_bank(gpio);
+	spin_lock(&bank->lock);
+	if (unlikely(!(bank->reserved_map & (1 << get_gpio_index(gpio))))) {
+		printk(KERN_ERR "omap-gpio: GPIO %d wasn't reserved!\n", gpio);
+		dump_stack();
+		spin_unlock(&bank->lock);
+		return;
+	}
+	bank->reserved_map &= ~(1 << get_gpio_index(gpio));
+	_set_gpio_direction(bank, get_gpio_index(gpio), 1);
+	_set_gpio_irqenable(bank, gpio, 0);
+	_clear_gpio_irqstatus(bank, gpio);
+	spin_unlock(&bank->lock);
+}
+
+/*
+ * We need to unmask the GPIO bank interrupt as soon as possible to
+ * avoid missing GPIO interrupts for other lines in the bank.
+ * Then we need to mask-read-clear-unmask the triggered GPIO lines
+ * in the bank to avoid missing nested interrupts for a GPIO line.
+ * If we wait to unmask individual GPIO lines in the bank after the
+ * line's interrupt handler has been run, we may miss some nested
+ * interrupts.
+ */
+static void gpio_irq_handler(unsigned int irq, struct irqdesc *desc,
+			     struct pt_regs *regs)
+{
+	u32 isr_reg = 0;
+	u32 isr;
+	unsigned int gpio_irq;
+	struct gpio_bank *bank;
+
+	desc->chip->ack(irq);
+
+	bank = (struct gpio_bank *) desc->data;
+	if (bank->method == METHOD_MPUIO)
+		isr_reg = bank->base + OMAP_MPUIO_GPIO_INT;
+#ifdef CONFIG_ARCH_OMAP1510
+	if (bank->method == METHOD_GPIO_1510)
+		isr_reg = bank->base + OMAP1510_GPIO_INT_STATUS;
+#endif
+#if defined(CONFIG_ARCH_OMAP16XX)
+	if (bank->method == METHOD_GPIO_1610)
+		isr_reg = bank->base + OMAP1610_GPIO_IRQSTATUS1;
+#endif
+#ifdef CONFIG_ARCH_OMAP730
+	if (bank->method == METHOD_GPIO_730)
+		isr_reg = bank->base + OMAP730_GPIO_INT_STATUS;
+#endif
+
+	isr = __raw_readl(isr_reg);
+	_enable_gpio_irqbank(bank, isr, 0);
+	_clear_gpio_irqbank(bank, isr);
+	_enable_gpio_irqbank(bank, isr, 1);
+	desc->chip->unmask(irq);
+
+	if (unlikely(!isr))
+		return;
+
+	gpio_irq = bank->virtual_irq_start;
+	for (; isr != 0; isr >>= 1, gpio_irq++) {
+		struct irqdesc *d;
+		if (!(isr & 1))
+			continue;
+		d = irq_desc + gpio_irq;
+		d->handle(gpio_irq, d, regs);
+	}
+}
+
+static void gpio_ack_irq(unsigned int irq)
+{
+	unsigned int gpio = irq - IH_GPIO_BASE;
+	struct gpio_bank *bank = get_gpio_bank(gpio);
+
+	_clear_gpio_irqstatus(bank, gpio);
+}
+
+static void gpio_mask_irq(unsigned int irq)
+{
+	unsigned int gpio = irq - IH_GPIO_BASE;
+	struct gpio_bank *bank = get_gpio_bank(gpio);
+
+	_set_gpio_irqenable(bank, gpio, 0);
+}
+
+static void gpio_unmask_irq(unsigned int irq)
+{
+	unsigned int gpio = irq - IH_GPIO_BASE;
+	struct gpio_bank *bank = get_gpio_bank(gpio);
+
+	if (_get_gpio_edge_ctrl(bank, get_gpio_index(gpio)) == OMAP_GPIO_NO_EDGE) {
+		printk(KERN_ERR "OMAP GPIO %d: trying to enable GPIO IRQ while no edge is set\n",
+		       gpio);
+		_set_gpio_edge_ctrl(bank, get_gpio_index(gpio), OMAP_GPIO_RISING_EDGE);
+	}
+	_set_gpio_irqenable(bank, gpio, 1);
+}
+
+static void mpuio_ack_irq(unsigned int irq)
+{
+	/* The ISR is reset automatically, so do nothing here. */
+}
+
+static void mpuio_mask_irq(unsigned int irq)
+{
+	unsigned int gpio = OMAP_MPUIO(irq - IH_MPUIO_BASE);
+	struct gpio_bank *bank = get_gpio_bank(gpio);
+
+	_set_gpio_irqenable(bank, gpio, 0);
+}
+
+static void mpuio_unmask_irq(unsigned int irq)
+{
+	unsigned int gpio = OMAP_MPUIO(irq - IH_MPUIO_BASE);
+	struct gpio_bank *bank = get_gpio_bank(gpio);
+
+	_set_gpio_irqenable(bank, gpio, 1);
+}
+
+static struct irqchip gpio_irq_chip = {
+	.ack	= gpio_ack_irq,
+	.mask	= gpio_mask_irq,
+	.unmask = gpio_unmask_irq,
+};
+
+static struct irqchip mpuio_irq_chip = {
+	.ack	= mpuio_ack_irq,
+	.mask	= mpuio_mask_irq,
+	.unmask = mpuio_unmask_irq
+};
+
+static int initialized = 0;
+
+static int __init _omap_gpio_init(void)
+{
+	int i;
+	struct gpio_bank *bank;
+
+	initialized = 1;
+
+#ifdef CONFIG_ARCH_OMAP1510
+	if (cpu_is_omap1510()) {
+		printk(KERN_INFO "OMAP1510 GPIO hardware\n");
+		gpio_bank_count = 2;
+		gpio_bank = gpio_bank_1510;
+	}
+#endif
+#if defined(CONFIG_ARCH_OMAP16XX)
+	if (cpu_is_omap16xx()) {
+		int rev;
+
+		gpio_bank_count = 5;
+		gpio_bank = gpio_bank_1610;
+		rev = omap_readw(gpio_bank[1].base + OMAP1610_GPIO_REVISION);
+		printk(KERN_INFO "OMAP GPIO hardware version %d.%d\n",
+		       (rev >> 4) & 0x0f, rev & 0x0f);
+	}
+#endif
+#ifdef CONFIG_ARCH_OMAP730
+	if (cpu_is_omap730()) {
+		printk(KERN_INFO "OMAP730 GPIO hardware\n");
+		gpio_bank_count = 7;
+		gpio_bank = gpio_bank_730;
+	}
+#endif
+	for (i = 0; i < gpio_bank_count; i++) {
+		int j, gpio_count = 16;
+
+		bank = &gpio_bank[i];
+		bank->reserved_map = 0;
+		bank->base = IO_ADDRESS(bank->base);
+		spin_lock_init(&bank->lock);
+		if (bank->method == METHOD_MPUIO) {
+			omap_writew(0xFFFF, OMAP_MPUIO_BASE + OMAP_MPUIO_GPIO_MASKIT);
+		}
+#ifdef CONFIG_ARCH_OMAP1510
+		if (bank->method == METHOD_GPIO_1510) {
+			__raw_writew(0xffff, bank->base + OMAP1510_GPIO_INT_MASK);
+			__raw_writew(0x0000, bank->base + OMAP1510_GPIO_INT_STATUS);
+		}
+#endif
+#if defined(CONFIG_ARCH_OMAP16XX)
+		if (bank->method == METHOD_GPIO_1610) {
+			__raw_writew(0x0000, bank->base + OMAP1610_GPIO_IRQENABLE1);
+			__raw_writew(0xffff, bank->base + OMAP1610_GPIO_IRQSTATUS1);
+		}
+#endif
+#ifdef CONFIG_ARCH_OMAP730
+		if (bank->method == METHOD_GPIO_730) {
+			__raw_writel(0xffffffff, bank->base + OMAP730_GPIO_INT_MASK);
+			__raw_writel(0x00000000, bank->base + OMAP730_GPIO_INT_STATUS);
+
+			gpio_count = 32; /* 730 has 32-bit GPIOs */
+		}
+#endif
+		for (j = bank->virtual_irq_start;
+		     j < bank->virtual_irq_start + gpio_count; j++) {
+			if (bank->method == METHOD_MPUIO)
+				set_irq_chip(j, &mpuio_irq_chip);
+			else
+				set_irq_chip(j, &gpio_irq_chip);
+			set_irq_handler(j, do_simple_IRQ);
+			set_irq_flags(j, IRQF_VALID);
+		}
+		set_irq_chained_handler(bank->irq, gpio_irq_handler);
+		set_irq_data(bank->irq, bank);
+	}
+
+	/* Enable system clock for GPIO module.
+	 * The CAM_CLK_CTRL *is* really the right place. */
+	if (cpu_is_omap1610() || cpu_is_omap1710())
+		omap_writel(omap_readl(ULPD_CAM_CLK_CTRL) | 0x04, ULPD_CAM_CLK_CTRL);
+
+	return 0;
+}
+
+/*
+ * This may get called early from board specific init
+ */
+int omap_gpio_init(void)
+{
+	if (!initialized)
+		return _omap_gpio_init();
+	else
+		return 0;
+}
+
+EXPORT_SYMBOL(omap_request_gpio);
+EXPORT_SYMBOL(omap_free_gpio);
+EXPORT_SYMBOL(omap_set_gpio_direction);
+EXPORT_SYMBOL(omap_set_gpio_dataout);
+EXPORT_SYMBOL(omap_get_gpio_datain);
+EXPORT_SYMBOL(omap_set_gpio_edge_ctrl);
+
+arch_initcall(omap_gpio_init);