/*
 *  linux/arch/arm/plat-omap/gpio.c
 *
 * Support functions for OMAP GPIO
 *
 * Copyright (C) 2003-2005 Nokia Corporation
 * Written by Juha Yrjölä <juha.yrjola@nokia.com>
 *
 * Copyright (C) 2009 Texas Instruments
 * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.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/init.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/sysdev.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/io.h>

#include <mach/hardware.h>
#include <asm/irq.h>
#include <mach/irqs.h>
#include <mach/gpio.h>
#include <asm/mach/irq.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_WAKEUPENABLE	0x0028
#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_WAKEUPENA	0x00a8
#define OMAP1610_GPIO_CLEAR_DATAOUT	0x00b0
#define OMAP1610_GPIO_SET_IRQENABLE1	0x00dc
#define OMAP1610_GPIO_SET_WAKEUPENA	0x00e8
#define OMAP1610_GPIO_SET_DATAOUT	0x00f0

/*
 * OMAP7XX specific GPIO registers
 */
#define OMAP7XX_GPIO1_BASE		0xfffbc000
#define OMAP7XX_GPIO2_BASE		0xfffbc800
#define OMAP7XX_GPIO3_BASE		0xfffbd000
#define OMAP7XX_GPIO4_BASE		0xfffbd800
#define OMAP7XX_GPIO5_BASE		0xfffbe000
#define OMAP7XX_GPIO6_BASE		0xfffbe800
#define OMAP7XX_GPIO_DATA_INPUT		0x00
#define OMAP7XX_GPIO_DATA_OUTPUT	0x04
#define OMAP7XX_GPIO_DIR_CONTROL	0x08
#define OMAP7XX_GPIO_INT_CONTROL	0x0c
#define OMAP7XX_GPIO_INT_MASK		0x10
#define OMAP7XX_GPIO_INT_STATUS		0x14

#define OMAP1_MPUIO_VBASE		OMAP1_MPUIO_BASE

/*
 * omap24xx specific GPIO registers
 */
#define OMAP242X_GPIO1_BASE		0x48018000
#define OMAP242X_GPIO2_BASE		0x4801a000
#define OMAP242X_GPIO3_BASE		0x4801c000
#define OMAP242X_GPIO4_BASE		0x4801e000

#define OMAP243X_GPIO1_BASE		0x4900C000
#define OMAP243X_GPIO2_BASE		0x4900E000
#define OMAP243X_GPIO3_BASE		0x49010000
#define OMAP243X_GPIO4_BASE		0x49012000
#define OMAP243X_GPIO5_BASE		0x480B6000

#define OMAP24XX_GPIO_REVISION		0x0000
#define OMAP24XX_GPIO_SYSCONFIG		0x0010
#define OMAP24XX_GPIO_SYSSTATUS		0x0014
#define OMAP24XX_GPIO_IRQSTATUS1	0x0018
#define OMAP24XX_GPIO_IRQSTATUS2	0x0028
#define OMAP24XX_GPIO_IRQENABLE2	0x002c
#define OMAP24XX_GPIO_IRQENABLE1	0x001c
#define OMAP24XX_GPIO_WAKE_EN		0x0020
#define OMAP24XX_GPIO_CTRL		0x0030
#define OMAP24XX_GPIO_OE		0x0034
#define OMAP24XX_GPIO_DATAIN		0x0038
#define OMAP24XX_GPIO_DATAOUT		0x003c
#define OMAP24XX_GPIO_LEVELDETECT0	0x0040
#define OMAP24XX_GPIO_LEVELDETECT1	0x0044
#define OMAP24XX_GPIO_RISINGDETECT	0x0048
#define OMAP24XX_GPIO_FALLINGDETECT	0x004c
#define OMAP24XX_GPIO_DEBOUNCE_EN	0x0050
#define OMAP24XX_GPIO_DEBOUNCE_VAL	0x0054
#define OMAP24XX_GPIO_CLEARIRQENABLE1	0x0060
#define OMAP24XX_GPIO_SETIRQENABLE1	0x0064
#define OMAP24XX_GPIO_CLEARWKUENA	0x0080
#define OMAP24XX_GPIO_SETWKUENA		0x0084
#define OMAP24XX_GPIO_CLEARDATAOUT	0x0090
#define OMAP24XX_GPIO_SETDATAOUT	0x0094

#define OMAP4_GPIO_REVISION		0x0000
#define OMAP4_GPIO_SYSCONFIG		0x0010
#define OMAP4_GPIO_EOI			0x0020
#define OMAP4_GPIO_IRQSTATUSRAW0	0x0024
#define OMAP4_GPIO_IRQSTATUSRAW1	0x0028
#define OMAP4_GPIO_IRQSTATUS0		0x002c
#define OMAP4_GPIO_IRQSTATUS1		0x0030
#define OMAP4_GPIO_IRQSTATUSSET0	0x0034
#define OMAP4_GPIO_IRQSTATUSSET1	0x0038
#define OMAP4_GPIO_IRQSTATUSCLR0	0x003c
#define OMAP4_GPIO_IRQSTATUSCLR1	0x0040
#define OMAP4_GPIO_IRQWAKEN0		0x0044
#define OMAP4_GPIO_IRQWAKEN1		0x0048
#define OMAP4_GPIO_SYSSTATUS		0x0104
#define OMAP4_GPIO_CTRL			0x0130
#define OMAP4_GPIO_OE			0x0134
#define OMAP4_GPIO_DATAIN		0x0138
#define OMAP4_GPIO_DATAOUT		0x013c
#define OMAP4_GPIO_LEVELDETECT0		0x0140
#define OMAP4_GPIO_LEVELDETECT1		0x0144
#define OMAP4_GPIO_RISINGDETECT		0x0148
#define OMAP4_GPIO_FALLINGDETECT	0x014c
#define OMAP4_GPIO_DEBOUNCENABLE	0x0150
#define OMAP4_GPIO_DEBOUNCINGTIME	0x0154
#define OMAP4_GPIO_CLEARDATAOUT		0x0190
#define OMAP4_GPIO_SETDATAOUT		0x0194
/*
 * omap34xx specific GPIO registers
 */

#define OMAP34XX_GPIO1_BASE		0x48310000
#define OMAP34XX_GPIO2_BASE		0x49050000
#define OMAP34XX_GPIO3_BASE		0x49052000
#define OMAP34XX_GPIO4_BASE		0x49054000
#define OMAP34XX_GPIO5_BASE		0x49056000
#define OMAP34XX_GPIO6_BASE		0x49058000

/*
 * OMAP44XX  specific GPIO registers
 */
#define OMAP44XX_GPIO1_BASE             0x4a310000
#define OMAP44XX_GPIO2_BASE             0x48055000
#define OMAP44XX_GPIO3_BASE             0x48057000
#define OMAP44XX_GPIO4_BASE             0x48059000
#define OMAP44XX_GPIO5_BASE             0x4805B000
#define OMAP44XX_GPIO6_BASE             0x4805D000

struct gpio_bank {
	unsigned long pbase;
	void __iomem *base;
	u16 irq;
	u16 virtual_irq_start;
	int method;
#if defined(CONFIG_ARCH_OMAP16XX) || defined(CONFIG_ARCH_OMAP2PLUS)
	u32 suspend_wakeup;
	u32 saved_wakeup;
#endif
#ifdef CONFIG_ARCH_OMAP2PLUS
	u32 non_wakeup_gpios;
	u32 enabled_non_wakeup_gpios;

	u32 saved_datain;
	u32 saved_fallingdetect;
	u32 saved_risingdetect;
#endif
	u32 level_mask;
	u32 toggle_mask;
	spinlock_t lock;
	struct gpio_chip chip;
	struct clk *dbck;
	u32 mod_usage;
};

#define METHOD_MPUIO		0
#define METHOD_GPIO_1510	1
#define METHOD_GPIO_1610	2
#define METHOD_GPIO_7XX		3
#define METHOD_GPIO_24XX	5

#ifdef CONFIG_ARCH_OMAP16XX
static struct gpio_bank gpio_bank_1610[5] = {
	{ OMAP1_MPUIO_VBASE, NULL, INT_MPUIO, IH_MPUIO_BASE,
		METHOD_MPUIO },
	{ OMAP1610_GPIO1_BASE, NULL, INT_GPIO_BANK1, IH_GPIO_BASE,
		METHOD_GPIO_1610 },
	{ OMAP1610_GPIO2_BASE, NULL, INT_1610_GPIO_BANK2, IH_GPIO_BASE + 16,
		METHOD_GPIO_1610 },
	{ OMAP1610_GPIO3_BASE, NULL, INT_1610_GPIO_BANK3, IH_GPIO_BASE + 32,
		METHOD_GPIO_1610 },
	{ OMAP1610_GPIO4_BASE, NULL, INT_1610_GPIO_BANK4, IH_GPIO_BASE + 48,
		METHOD_GPIO_1610 },
};
#endif

#ifdef CONFIG_ARCH_OMAP15XX
static struct gpio_bank gpio_bank_1510[2] = {
	{ OMAP1_MPUIO_VBASE, NULL, INT_MPUIO, IH_MPUIO_BASE,
		METHOD_MPUIO },
	{ OMAP1510_GPIO_BASE, NULL, INT_GPIO_BANK1, IH_GPIO_BASE,
		METHOD_GPIO_1510 }
};
#endif

#if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850)
static struct gpio_bank gpio_bank_7xx[7] = {
	{ OMAP1_MPUIO_VBASE, NULL, INT_7XX_MPUIO, IH_MPUIO_BASE,
		METHOD_MPUIO },
	{ OMAP7XX_GPIO1_BASE, NULL, INT_7XX_GPIO_BANK1, IH_GPIO_BASE,
		METHOD_GPIO_7XX },
	{ OMAP7XX_GPIO2_BASE, NULL, INT_7XX_GPIO_BANK2, IH_GPIO_BASE + 32,
		METHOD_GPIO_7XX },
	{ OMAP7XX_GPIO3_BASE, NULL, INT_7XX_GPIO_BANK3, IH_GPIO_BASE + 64,
		METHOD_GPIO_7XX },
	{ OMAP7XX_GPIO4_BASE, NULL, INT_7XX_GPIO_BANK4,  IH_GPIO_BASE + 96,
		METHOD_GPIO_7XX },
	{ OMAP7XX_GPIO5_BASE, NULL, INT_7XX_GPIO_BANK5,  IH_GPIO_BASE + 128,
		METHOD_GPIO_7XX },
	{ OMAP7XX_GPIO6_BASE, NULL, INT_7XX_GPIO_BANK6,  IH_GPIO_BASE + 160,
		METHOD_GPIO_7XX },
};
#endif

#ifdef CONFIG_ARCH_OMAP2

static struct gpio_bank gpio_bank_242x[4] = {
	{ OMAP242X_GPIO1_BASE, NULL, INT_24XX_GPIO_BANK1, IH_GPIO_BASE,
		METHOD_GPIO_24XX },
	{ OMAP242X_GPIO2_BASE, NULL, INT_24XX_GPIO_BANK2, IH_GPIO_BASE + 32,
		METHOD_GPIO_24XX },
	{ OMAP242X_GPIO3_BASE, NULL, INT_24XX_GPIO_BANK3, IH_GPIO_BASE + 64,
		METHOD_GPIO_24XX },
	{ OMAP242X_GPIO4_BASE, NULL, INT_24XX_GPIO_BANK4, IH_GPIO_BASE + 96,
		METHOD_GPIO_24XX },
};

static struct gpio_bank gpio_bank_243x[5] = {
	{ OMAP243X_GPIO1_BASE, NULL, INT_24XX_GPIO_BANK1, IH_GPIO_BASE,
		METHOD_GPIO_24XX },
	{ OMAP243X_GPIO2_BASE, NULL, INT_24XX_GPIO_BANK2, IH_GPIO_BASE + 32,
		METHOD_GPIO_24XX },
	{ OMAP243X_GPIO3_BASE, NULL, INT_24XX_GPIO_BANK3, IH_GPIO_BASE + 64,
		METHOD_GPIO_24XX },
	{ OMAP243X_GPIO4_BASE, NULL, INT_24XX_GPIO_BANK4, IH_GPIO_BASE + 96,
		METHOD_GPIO_24XX },
	{ OMAP243X_GPIO5_BASE, NULL, INT_24XX_GPIO_BANK5, IH_GPIO_BASE + 128,
		METHOD_GPIO_24XX },
};

#endif

#ifdef CONFIG_ARCH_OMAP3
static struct gpio_bank gpio_bank_34xx[6] = {
	{ OMAP34XX_GPIO1_BASE, NULL, INT_34XX_GPIO_BANK1, IH_GPIO_BASE,
		METHOD_GPIO_24XX },
	{ OMAP34XX_GPIO2_BASE, NULL, INT_34XX_GPIO_BANK2, IH_GPIO_BASE + 32,
		METHOD_GPIO_24XX },
	{ OMAP34XX_GPIO3_BASE, NULL, INT_34XX_GPIO_BANK3, IH_GPIO_BASE + 64,
		METHOD_GPIO_24XX },
	{ OMAP34XX_GPIO4_BASE, NULL, INT_34XX_GPIO_BANK4, IH_GPIO_BASE + 96,
		METHOD_GPIO_24XX },
	{ OMAP34XX_GPIO5_BASE, NULL, INT_34XX_GPIO_BANK5, IH_GPIO_BASE + 128,
		METHOD_GPIO_24XX },
	{ OMAP34XX_GPIO6_BASE, NULL, INT_34XX_GPIO_BANK6, IH_GPIO_BASE + 160,
		METHOD_GPIO_24XX },
};

struct omap3_gpio_regs {
	u32 sysconfig;
	u32 irqenable1;
	u32 irqenable2;
	u32 wake_en;
	u32 ctrl;
	u32 oe;
	u32 leveldetect0;
	u32 leveldetect1;
	u32 risingdetect;
	u32 fallingdetect;
	u32 dataout;
	u32 setwkuena;
	u32 setdataout;
};

static struct omap3_gpio_regs gpio_context[OMAP34XX_NR_GPIOS];
#endif

#ifdef CONFIG_ARCH_OMAP4
static struct gpio_bank gpio_bank_44xx[6] = {
	{ OMAP44XX_GPIO1_BASE, NULL, INT_44XX_GPIO_BANK1, IH_GPIO_BASE,
		METHOD_GPIO_24XX },
	{ OMAP44XX_GPIO2_BASE, NULL, INT_44XX_GPIO_BANK2, IH_GPIO_BASE + 32,
		METHOD_GPIO_24XX },
	{ OMAP44XX_GPIO3_BASE, NULL, INT_44XX_GPIO_BANK3, IH_GPIO_BASE + 64,
		METHOD_GPIO_24XX },
	{ OMAP44XX_GPIO4_BASE, NULL, INT_44XX_GPIO_BANK4, IH_GPIO_BASE + 96,
		METHOD_GPIO_24XX },
	{ OMAP44XX_GPIO5_BASE, NULL, INT_44XX_GPIO_BANK5, IH_GPIO_BASE + 128,
		METHOD_GPIO_24XX },
	{ OMAP44XX_GPIO6_BASE, NULL, INT_44XX_GPIO_BANK6, IH_GPIO_BASE + 160,
		METHOD_GPIO_24XX },
};

#endif

static struct gpio_bank *gpio_bank;
static int gpio_bank_count;

static inline struct gpio_bank *get_gpio_bank(int gpio)
{
	if (cpu_is_omap15xx()) {
		if (OMAP_GPIO_IS_MPUIO(gpio))
			return &gpio_bank[0];
		return &gpio_bank[1];
	}
	if (cpu_is_omap16xx()) {
		if (OMAP_GPIO_IS_MPUIO(gpio))
			return &gpio_bank[0];
		return &gpio_bank[1 + (gpio >> 4)];
	}
	if (cpu_is_omap7xx()) {
		if (OMAP_GPIO_IS_MPUIO(gpio))
			return &gpio_bank[0];
		return &gpio_bank[1 + (gpio >> 5)];
	}
	if (cpu_is_omap24xx())
		return &gpio_bank[gpio >> 5];
	if (cpu_is_omap34xx() || cpu_is_omap44xx())
		return &gpio_bank[gpio >> 5];
	BUG();
	return NULL;
}

static inline int get_gpio_index(int gpio)
{
	if (cpu_is_omap7xx())
		return gpio & 0x1f;
	if (cpu_is_omap24xx())
		return gpio & 0x1f;
	if (cpu_is_omap34xx() || cpu_is_omap44xx())
		return gpio & 0x1f;
	return gpio & 0x0f;
}

static inline int gpio_valid(int gpio)
{
	if (gpio < 0)
		return -1;
	if (cpu_class_is_omap1() && OMAP_GPIO_IS_MPUIO(gpio)) {
		if (gpio >= OMAP_MAX_GPIO_LINES + 16)
			return -1;
		return 0;
	}
	if (cpu_is_omap15xx() && gpio < 16)
		return 0;
	if ((cpu_is_omap16xx()) && gpio < 64)
		return 0;
	if (cpu_is_omap7xx() && gpio < 192)
		return 0;
	if (cpu_is_omap24xx() && gpio < 128)
		return 0;
	if ((cpu_is_omap34xx() || cpu_is_omap44xx()) && gpio < 192)
		return 0;
	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)
{
	void __iomem *reg = bank->base;
	u32 l;

	switch (bank->method) {
#ifdef CONFIG_ARCH_OMAP1
	case METHOD_MPUIO:
		reg += OMAP_MPUIO_IO_CNTL;
		break;
#endif
#ifdef CONFIG_ARCH_OMAP15XX
	case METHOD_GPIO_1510:
		reg += OMAP1510_GPIO_DIR_CONTROL;
		break;
#endif
#ifdef CONFIG_ARCH_OMAP16XX
	case METHOD_GPIO_1610:
		reg += OMAP1610_GPIO_DIRECTION;
		break;
#endif
#if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850)
	case METHOD_GPIO_7XX:
		reg += OMAP7XX_GPIO_DIR_CONTROL;
		break;
#endif
#if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
	case METHOD_GPIO_24XX:
		reg += OMAP24XX_GPIO_OE;
		break;
#endif
#if defined(CONFIG_ARCH_OMAP4)
	case METHOD_GPIO_24XX:
		reg += OMAP4_GPIO_OE;
		break;
#endif
	default:
		WARN_ON(1);
		return;
	}
	l = __raw_readl(reg);
	if (is_input)
		l |= 1 << gpio;
	else
		l &= ~(1 << gpio);
	__raw_writel(l, reg);
}

static void _set_gpio_dataout(struct gpio_bank *bank, int gpio, int enable)
{
	void __iomem *reg = bank->base;
	u32 l = 0;

	switch (bank->method) {
#ifdef CONFIG_ARCH_OMAP1
	case METHOD_MPUIO:
		reg += OMAP_MPUIO_OUTPUT;
		l = __raw_readl(reg);
		if (enable)
			l |= 1 << gpio;
		else
			l &= ~(1 << gpio);
		break;
#endif
#ifdef CONFIG_ARCH_OMAP15XX
	case METHOD_GPIO_1510:
		reg += OMAP1510_GPIO_DATA_OUTPUT;
		l = __raw_readl(reg);
		if (enable)
			l |= 1 << gpio;
		else
			l &= ~(1 << gpio);
		break;
#endif
#ifdef CONFIG_ARCH_OMAP16XX
	case METHOD_GPIO_1610:
		if (enable)
			reg += OMAP1610_GPIO_SET_DATAOUT;
		else
			reg += OMAP1610_GPIO_CLEAR_DATAOUT;
		l = 1 << gpio;
		break;
#endif
#if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850)
	case METHOD_GPIO_7XX:
		reg += OMAP7XX_GPIO_DATA_OUTPUT;
		l = __raw_readl(reg);
		if (enable)
			l |= 1 << gpio;
		else
			l &= ~(1 << gpio);
		break;
#endif
#if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
	case METHOD_GPIO_24XX:
		if (enable)
			reg += OMAP24XX_GPIO_SETDATAOUT;
		else
			reg += OMAP24XX_GPIO_CLEARDATAOUT;
		l = 1 << gpio;
		break;
#endif
#ifdef CONFIG_ARCH_OMAP4
	case METHOD_GPIO_24XX:
		if (enable)
			reg += OMAP4_GPIO_SETDATAOUT;
		else
			reg += OMAP4_GPIO_CLEARDATAOUT;
		l = 1 << gpio;
		break;
#endif
	default:
		WARN_ON(1);
		return;
	}
	__raw_writel(l, reg);
}

static int _get_gpio_datain(struct gpio_bank *bank, int gpio)
{
	void __iomem *reg;

	if (check_gpio(gpio) < 0)
		return -EINVAL;
	reg = bank->base;
	switch (bank->method) {
#ifdef CONFIG_ARCH_OMAP1
	case METHOD_MPUIO:
		reg += OMAP_MPUIO_INPUT_LATCH;
		break;
#endif
#ifdef CONFIG_ARCH_OMAP15XX
	case METHOD_GPIO_1510:
		reg += OMAP1510_GPIO_DATA_INPUT;
		break;
#endif
#ifdef CONFIG_ARCH_OMAP16XX
	case METHOD_GPIO_1610:
		reg += OMAP1610_GPIO_DATAIN;
		break;
#endif
#if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850)
	case METHOD_GPIO_7XX:
		reg += OMAP7XX_GPIO_DATA_INPUT;
		break;
#endif
#if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
	case METHOD_GPIO_24XX:
		reg += OMAP24XX_GPIO_DATAIN;
		break;
#endif
#ifdef CONFIG_ARCH_OMAP4
	case METHOD_GPIO_24XX:
		reg += OMAP4_GPIO_DATAIN;
		break;
#endif
	default:
		return -EINVAL;
	}
	return (__raw_readl(reg)
			& (1 << get_gpio_index(gpio))) != 0;
}

static int _get_gpio_dataout(struct gpio_bank *bank, int gpio)
{
	void __iomem *reg;

	if (check_gpio(gpio) < 0)
		return -EINVAL;
	reg = bank->base;

	switch (bank->method) {
#ifdef CONFIG_ARCH_OMAP1
	case METHOD_MPUIO:
		reg += OMAP_MPUIO_OUTPUT;
		break;
#endif
#ifdef CONFIG_ARCH_OMAP15XX
	case METHOD_GPIO_1510:
		reg += OMAP1510_GPIO_DATA_OUTPUT;
		break;
#endif
#ifdef CONFIG_ARCH_OMAP16XX
	case METHOD_GPIO_1610:
		reg += OMAP1610_GPIO_DATAOUT;
		break;
#endif
#if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850)
	case METHOD_GPIO_7XX:
		reg += OMAP7XX_GPIO_DATA_OUTPUT;
		break;
#endif
#ifdef CONFIG_ARCH_OMAP2PLUS
	case METHOD_GPIO_24XX:
		reg += OMAP24XX_GPIO_DATAOUT;
		break;
#endif
	default:
		return -EINVAL;
	}

	return (__raw_readl(reg) & (1 << get_gpio_index(gpio))) != 0;
}

#define MOD_REG_BIT(reg, bit_mask, set)	\
do {	\
	int l = __raw_readl(base + reg); \
	if (set) l |= bit_mask; \
	else l &= ~bit_mask; \
	__raw_writel(l, base + reg); \
} while(0)

void omap_set_gpio_debounce(int gpio, int enable)
{
	struct gpio_bank *bank;
	void __iomem *reg;
	unsigned long flags;
	u32 val, l = 1 << get_gpio_index(gpio);

	if (cpu_class_is_omap1())
		return;

	bank = get_gpio_bank(gpio);
	reg = bank->base;
#ifdef CONFIG_ARCH_OMAP4
	reg += OMAP4_GPIO_DEBOUNCENABLE;
#else
	reg += OMAP24XX_GPIO_DEBOUNCE_EN;
#endif
	if (!(bank->mod_usage & l)) {
		printk(KERN_ERR "GPIO %d not requested\n", gpio);
		return;
	}

	spin_lock_irqsave(&bank->lock, flags);
	val = __raw_readl(reg);

	if (enable && !(val & l))
		val |= l;
	else if (!enable && (val & l))
		val &= ~l;
	else
		goto done;

	if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
		if (enable)
			clk_enable(bank->dbck);
		else
			clk_disable(bank->dbck);
	}

	__raw_writel(val, reg);
done:
	spin_unlock_irqrestore(&bank->lock, flags);
}
EXPORT_SYMBOL(omap_set_gpio_debounce);

void omap_set_gpio_debounce_time(int gpio, int enc_time)
{
	struct gpio_bank *bank;
	void __iomem *reg;

	if (cpu_class_is_omap1())
		return;

	bank = get_gpio_bank(gpio);
	reg = bank->base;

	if (!bank->mod_usage) {
		printk(KERN_ERR "GPIO not requested\n");
		return;
	}

	enc_time &= 0xff;
#ifdef CONFIG_ARCH_OMAP4
	reg += OMAP4_GPIO_DEBOUNCINGTIME;
#else
	reg += OMAP24XX_GPIO_DEBOUNCE_VAL;
#endif
	__raw_writel(enc_time, reg);
}
EXPORT_SYMBOL(omap_set_gpio_debounce_time);

#ifdef CONFIG_ARCH_OMAP2PLUS
static inline void set_24xx_gpio_triggering(struct gpio_bank *bank, int gpio,
						int trigger)
{
	void __iomem *base = bank->base;
	u32 gpio_bit = 1 << gpio;
	u32 val;

	if (cpu_is_omap44xx()) {
		MOD_REG_BIT(OMAP4_GPIO_LEVELDETECT0, gpio_bit,
			trigger & IRQ_TYPE_LEVEL_LOW);
		MOD_REG_BIT(OMAP4_GPIO_LEVELDETECT1, gpio_bit,
			trigger & IRQ_TYPE_LEVEL_HIGH);
		MOD_REG_BIT(OMAP4_GPIO_RISINGDETECT, gpio_bit,
			trigger & IRQ_TYPE_EDGE_RISING);
		MOD_REG_BIT(OMAP4_GPIO_FALLINGDETECT, gpio_bit,
			trigger & IRQ_TYPE_EDGE_FALLING);
	} else {
		MOD_REG_BIT(OMAP24XX_GPIO_LEVELDETECT0, gpio_bit,
			trigger & IRQ_TYPE_LEVEL_LOW);
		MOD_REG_BIT(OMAP24XX_GPIO_LEVELDETECT1, gpio_bit,
			trigger & IRQ_TYPE_LEVEL_HIGH);
		MOD_REG_BIT(OMAP24XX_GPIO_RISINGDETECT, gpio_bit,
			trigger & IRQ_TYPE_EDGE_RISING);
		MOD_REG_BIT(OMAP24XX_GPIO_FALLINGDETECT, gpio_bit,
			trigger & IRQ_TYPE_EDGE_FALLING);
	}
	if (likely(!(bank->non_wakeup_gpios & gpio_bit))) {
		if (cpu_is_omap44xx()) {
			if (trigger != 0)
				__raw_writel(1 << gpio, bank->base+
						OMAP4_GPIO_IRQWAKEN0);
			else {
				val = __raw_readl(bank->base +
							OMAP4_GPIO_IRQWAKEN0);
				__raw_writel(val & (~(1 << gpio)), bank->base +
							 OMAP4_GPIO_IRQWAKEN0);
			}
		} else {
			if (trigger != 0)
				__raw_writel(1 << gpio, bank->base
					+ OMAP24XX_GPIO_SETWKUENA);
			else
				__raw_writel(1 << gpio, bank->base
					+ OMAP24XX_GPIO_CLEARWKUENA);
		}
	} else {
		if (trigger != 0)
			bank->enabled_non_wakeup_gpios |= gpio_bit;
		else
			bank->enabled_non_wakeup_gpios &= ~gpio_bit;
	}

	if (cpu_is_omap44xx()) {
		bank->level_mask =
			__raw_readl(bank->base + OMAP4_GPIO_LEVELDETECT0) |
			__raw_readl(bank->base + OMAP4_GPIO_LEVELDETECT1);
	} else {
		bank->level_mask =
			__raw_readl(bank->base + OMAP24XX_GPIO_LEVELDETECT0) |
			__raw_readl(bank->base + OMAP24XX_GPIO_LEVELDETECT1);
	}
}
#endif

#ifdef CONFIG_ARCH_OMAP1
/*
 * This only applies to chips that can't do both rising and falling edge
 * detection at once.  For all other chips, this function is a noop.
 */
static void _toggle_gpio_edge_triggering(struct gpio_bank *bank, int gpio)
{
	void __iomem *reg = bank->base;
	u32 l = 0;

	switch (bank->method) {
	case METHOD_MPUIO:
		reg += OMAP_MPUIO_GPIO_INT_EDGE;
		break;
#ifdef CONFIG_ARCH_OMAP15XX
	case METHOD_GPIO_1510:
		reg += OMAP1510_GPIO_INT_CONTROL;
		break;
#endif
#if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850)
	case METHOD_GPIO_7XX:
		reg += OMAP7XX_GPIO_INT_CONTROL;
		break;
#endif
	default:
		return;
	}

	l = __raw_readl(reg);
	if ((l >> gpio) & 1)
		l &= ~(1 << gpio);
	else
		l |= 1 << gpio;

	__raw_writel(l, reg);
}
#endif

static int _set_gpio_triggering(struct gpio_bank *bank, int gpio, int trigger)
{
	void __iomem *reg = bank->base;
	u32 l = 0;

	switch (bank->method) {
#ifdef CONFIG_ARCH_OMAP1
	case METHOD_MPUIO:
		reg += OMAP_MPUIO_GPIO_INT_EDGE;
		l = __raw_readl(reg);
		if (trigger & IRQ_TYPE_EDGE_BOTH)
			bank->toggle_mask |= 1 << gpio;
		if (trigger & IRQ_TYPE_EDGE_RISING)
			l |= 1 << gpio;
		else if (trigger & IRQ_TYPE_EDGE_FALLING)
			l &= ~(1 << gpio);
		else
			goto bad;
		break;
#endif
#ifdef CONFIG_ARCH_OMAP15XX
	case METHOD_GPIO_1510:
		reg += OMAP1510_GPIO_INT_CONTROL;
		l = __raw_readl(reg);
		if (trigger & IRQ_TYPE_EDGE_BOTH)
			bank->toggle_mask |= 1 << gpio;
		if (trigger & IRQ_TYPE_EDGE_RISING)
			l |= 1 << gpio;
		else if (trigger & IRQ_TYPE_EDGE_FALLING)
			l &= ~(1 << gpio);
		else
			goto bad;
		break;
#endif
#ifdef CONFIG_ARCH_OMAP16XX
	case METHOD_GPIO_1610:
		if (gpio & 0x08)
			reg += OMAP1610_GPIO_EDGE_CTRL2;
		else
			reg += OMAP1610_GPIO_EDGE_CTRL1;
		gpio &= 0x07;
		l = __raw_readl(reg);
		l &= ~(3 << (gpio << 1));
		if (trigger & IRQ_TYPE_EDGE_RISING)
			l |= 2 << (gpio << 1);
		if (trigger & IRQ_TYPE_EDGE_FALLING)
			l |= 1 << (gpio << 1);
		if (trigger)
			/* Enable wake-up during idle for dynamic tick */
			__raw_writel(1 << gpio, bank->base + OMAP1610_GPIO_SET_WAKEUPENA);
		else
			__raw_writel(1 << gpio, bank->base + OMAP1610_GPIO_CLEAR_WAKEUPENA);
		break;
#endif
#if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850)
	case METHOD_GPIO_7XX:
		reg += OMAP7XX_GPIO_INT_CONTROL;
		l = __raw_readl(reg);
		if (trigger & IRQ_TYPE_EDGE_BOTH)
			bank->toggle_mask |= 1 << gpio;
		if (trigger & IRQ_TYPE_EDGE_RISING)
			l |= 1 << gpio;
		else if (trigger & IRQ_TYPE_EDGE_FALLING)
			l &= ~(1 << gpio);
		else
			goto bad;
		break;
#endif
#ifdef CONFIG_ARCH_OMAP2PLUS
	case METHOD_GPIO_24XX:
		set_24xx_gpio_triggering(bank, gpio, trigger);
		break;
#endif
	default:
		goto bad;
	}
	__raw_writel(l, reg);
	return 0;
bad:
	return -EINVAL;
}

static int gpio_irq_type(unsigned irq, unsigned type)
{
	struct gpio_bank *bank;
	unsigned gpio;
	int retval;
	unsigned long flags;

	if (!cpu_class_is_omap2() && irq > IH_MPUIO_BASE)
		gpio = OMAP_MPUIO(irq - IH_MPUIO_BASE);
	else
		gpio = irq - IH_GPIO_BASE;

	if (check_gpio(gpio) < 0)
		return -EINVAL;

	if (type & ~IRQ_TYPE_SENSE_MASK)
		return -EINVAL;

	/* OMAP1 allows only only edge triggering */
	if (!cpu_class_is_omap2()
			&& (type & (IRQ_TYPE_LEVEL_LOW|IRQ_TYPE_LEVEL_HIGH)))
		return -EINVAL;

	bank = get_irq_chip_data(irq);
	spin_lock_irqsave(&bank->lock, flags);
	retval = _set_gpio_triggering(bank, get_gpio_index(gpio), type);
	if (retval == 0) {
		irq_desc[irq].status &= ~IRQ_TYPE_SENSE_MASK;
		irq_desc[irq].status |= type;
	}
	spin_unlock_irqrestore(&bank->lock, flags);

	if (type & (IRQ_TYPE_LEVEL_LOW | IRQ_TYPE_LEVEL_HIGH))
		__set_irq_handler_unlocked(irq, handle_level_irq);
	else if (type & (IRQ_TYPE_EDGE_FALLING | IRQ_TYPE_EDGE_RISING))
		__set_irq_handler_unlocked(irq, handle_edge_irq);

	return retval;
}

static void _clear_gpio_irqbank(struct gpio_bank *bank, int gpio_mask)
{
	void __iomem *reg = bank->base;

	switch (bank->method) {
#ifdef CONFIG_ARCH_OMAP1
	case METHOD_MPUIO:
		/* MPUIO irqstatus is reset by reading the status register,
		 * so do nothing here */
		return;
#endif
#ifdef CONFIG_ARCH_OMAP15XX
	case METHOD_GPIO_1510:
		reg += OMAP1510_GPIO_INT_STATUS;
		break;
#endif
#ifdef CONFIG_ARCH_OMAP16XX
	case METHOD_GPIO_1610:
		reg += OMAP1610_GPIO_IRQSTATUS1;
		break;
#endif
#if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850)
	case METHOD_GPIO_7XX:
		reg += OMAP7XX_GPIO_INT_STATUS;
		break;
#endif
#if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
	case METHOD_GPIO_24XX:
		reg += OMAP24XX_GPIO_IRQSTATUS1;
		break;
#endif
#if defined(CONFIG_ARCH_OMAP4)
	case METHOD_GPIO_24XX:
		reg += OMAP4_GPIO_IRQSTATUS0;
		break;
#endif
	default:
		WARN_ON(1);
		return;
	}
	__raw_writel(gpio_mask, reg);

	/* Workaround for clearing DSP GPIO interrupts to allow retention */
#if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
	reg = bank->base + OMAP24XX_GPIO_IRQSTATUS2;
#endif
#if defined(CONFIG_ARCH_OMAP4)
	reg = bank->base + OMAP4_GPIO_IRQSTATUS1;
#endif
	if (cpu_is_omap24xx() || cpu_is_omap34xx() || cpu_is_omap44xx()) {
		__raw_writel(gpio_mask, reg);

	/* Flush posted write for the irq status to avoid spurious interrupts */
	__raw_readl(reg);
	}
}

static inline void _clear_gpio_irqstatus(struct gpio_bank *bank, int gpio)
{
	_clear_gpio_irqbank(bank, 1 << get_gpio_index(gpio));
}

static u32 _get_gpio_irqbank_mask(struct gpio_bank *bank)
{
	void __iomem *reg = bank->base;
	int inv = 0;
	u32 l;
	u32 mask;

	switch (bank->method) {
#ifdef CONFIG_ARCH_OMAP1
	case METHOD_MPUIO:
		reg += OMAP_MPUIO_GPIO_MASKIT;
		mask = 0xffff;
		inv = 1;
		break;
#endif
#ifdef CONFIG_ARCH_OMAP15XX
	case METHOD_GPIO_1510:
		reg += OMAP1510_GPIO_INT_MASK;
		mask = 0xffff;
		inv = 1;
		break;
#endif
#ifdef CONFIG_ARCH_OMAP16XX
	case METHOD_GPIO_1610:
		reg += OMAP1610_GPIO_IRQENABLE1;
		mask = 0xffff;
		break;
#endif
#if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850)
	case METHOD_GPIO_7XX:
		reg += OMAP7XX_GPIO_INT_MASK;
		mask = 0xffffffff;
		inv = 1;
		break;
#endif
#if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
	case METHOD_GPIO_24XX:
		reg += OMAP24XX_GPIO_IRQENABLE1;
		mask = 0xffffffff;
		break;
#endif
#if defined(CONFIG_ARCH_OMAP4)
	case METHOD_GPIO_24XX:
		reg += OMAP4_GPIO_IRQSTATUSSET0;
		mask = 0xffffffff;
		break;
#endif
	default:
		WARN_ON(1);
		return 0;
	}

	l = __raw_readl(reg);
	if (inv)
		l = ~l;
	l &= mask;
	return l;
}

static void _enable_gpio_irqbank(struct gpio_bank *bank, int gpio_mask, int enable)
{
	void __iomem *reg = bank->base;
	u32 l;

	switch (bank->method) {
#ifdef CONFIG_ARCH_OMAP1
	case METHOD_MPUIO:
		reg += OMAP_MPUIO_GPIO_MASKIT;
		l = __raw_readl(reg);
		if (enable)
			l &= ~(gpio_mask);
		else
			l |= gpio_mask;
		break;
#endif
#ifdef CONFIG_ARCH_OMAP15XX
	case METHOD_GPIO_1510:
		reg += OMAP1510_GPIO_INT_MASK;
		l = __raw_readl(reg);
		if (enable)
			l &= ~(gpio_mask);
		else
			l |= gpio_mask;
		break;
#endif
#ifdef CONFIG_ARCH_OMAP16XX
	case METHOD_GPIO_1610:
		if (enable)
			reg += OMAP1610_GPIO_SET_IRQENABLE1;
		else
			reg += OMAP1610_GPIO_CLEAR_IRQENABLE1;
		l = gpio_mask;
		break;
#endif
#if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850)
	case METHOD_GPIO_7XX:
		reg += OMAP7XX_GPIO_INT_MASK;
		l = __raw_readl(reg);
		if (enable)
			l &= ~(gpio_mask);
		else
			l |= gpio_mask;
		break;
#endif
#if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
	case METHOD_GPIO_24XX:
		if (enable)
			reg += OMAP24XX_GPIO_SETIRQENABLE1;
		else
			reg += OMAP24XX_GPIO_CLEARIRQENABLE1;
		l = gpio_mask;
		break;
#endif
#ifdef CONFIG_ARCH_OMAP4
	case METHOD_GPIO_24XX:
		if (enable)
			reg += OMAP4_GPIO_IRQSTATUSSET0;
		else
			reg += OMAP4_GPIO_IRQSTATUSCLR0;
		l = gpio_mask;
		break;
#endif
	default:
		WARN_ON(1);
		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);
}

/*
 * Note that ENAWAKEUP needs to be enabled in GPIO_SYSCONFIG register.
 * 1510 does not seem to have a wake-up register. If JTAG is connected
 * to the target, system will wake up always on GPIO events. While
 * system is running all registered GPIO interrupts need to have wake-up
 * enabled. When system is suspended, only selected GPIO interrupts need
 * to have wake-up enabled.
 */
static int _set_gpio_wakeup(struct gpio_bank *bank, int gpio, int enable)
{
	unsigned long uninitialized_var(flags);

	switch (bank->method) {
#ifdef CONFIG_ARCH_OMAP16XX
	case METHOD_MPUIO:
	case METHOD_GPIO_1610:
		spin_lock_irqsave(&bank->lock, flags);
		if (enable)
			bank->suspend_wakeup |= (1 << gpio);
		else
			bank->suspend_wakeup &= ~(1 << gpio);
		spin_unlock_irqrestore(&bank->lock, flags);
		return 0;
#endif
#ifdef CONFIG_ARCH_OMAP2PLUS
	case METHOD_GPIO_24XX:
		if (bank->non_wakeup_gpios & (1 << gpio)) {
			printk(KERN_ERR "Unable to modify wakeup on "
					"non-wakeup GPIO%d\n",
					(bank - gpio_bank) * 32 + gpio);
			return -EINVAL;
		}
		spin_lock_irqsave(&bank->lock, flags);
		if (enable)
			bank->suspend_wakeup |= (1 << gpio);
		else
			bank->suspend_wakeup &= ~(1 << gpio);
		spin_unlock_irqrestore(&bank->lock, flags);
		return 0;
#endif
	default:
		printk(KERN_ERR "Can't enable GPIO wakeup for method %i\n",
		       bank->method);
		return -EINVAL;
	}
}

static void _reset_gpio(struct gpio_bank *bank, int gpio)
{
	_set_gpio_direction(bank, get_gpio_index(gpio), 1);
	_set_gpio_irqenable(bank, gpio, 0);
	_clear_gpio_irqstatus(bank, gpio);
	_set_gpio_triggering(bank, get_gpio_index(gpio), IRQ_TYPE_NONE);
}

/* Use disable_irq_wake() and enable_irq_wake() functions from drivers */
static int gpio_wake_enable(unsigned int irq, unsigned int enable)
{
	unsigned int gpio = irq - IH_GPIO_BASE;
	struct gpio_bank *bank;
	int retval;

	if (check_gpio(gpio) < 0)
		return -ENODEV;
	bank = get_irq_chip_data(irq);
	retval = _set_gpio_wakeup(bank, get_gpio_index(gpio), enable);

	return retval;
}

static int omap_gpio_request(struct gpio_chip *chip, unsigned offset)
{
	struct gpio_bank *bank = container_of(chip, struct gpio_bank, chip);
	unsigned long flags;

	spin_lock_irqsave(&bank->lock, flags);

	/* Set trigger to none. You need to enable the desired trigger with
	 * request_irq() or set_irq_type().
	 */
	_set_gpio_triggering(bank, offset, IRQ_TYPE_NONE);

#ifdef CONFIG_ARCH_OMAP15XX
	if (bank->method == METHOD_GPIO_1510) {
		void __iomem *reg;

		/* Claim the pin for MPU */
		reg = bank->base + OMAP1510_GPIO_PIN_CONTROL;
		__raw_writel(__raw_readl(reg) | (1 << offset), reg);
	}
#endif
	if (!cpu_class_is_omap1()) {
		if (!bank->mod_usage) {
			u32 ctrl;
			ctrl = __raw_readl(bank->base + OMAP24XX_GPIO_CTRL);
			ctrl &= 0xFFFFFFFE;
			/* Module is enabled, clocks are not gated */
			__raw_writel(ctrl, bank->base + OMAP24XX_GPIO_CTRL);
		}
		bank->mod_usage |= 1 << offset;
	}
	spin_unlock_irqrestore(&bank->lock, flags);

	return 0;
}

static void omap_gpio_free(struct gpio_chip *chip, unsigned offset)
{
	struct gpio_bank *bank = container_of(chip, struct gpio_bank, chip);
	unsigned long flags;

	spin_lock_irqsave(&bank->lock, flags);
#ifdef CONFIG_ARCH_OMAP16XX
	if (bank->method == METHOD_GPIO_1610) {
		/* Disable wake-up during idle for dynamic tick */
		void __iomem *reg = bank->base + OMAP1610_GPIO_CLEAR_WAKEUPENA;
		__raw_writel(1 << offset, reg);
	}
#endif
#ifdef CONFIG_ARCH_OMAP2PLUS
	if (bank->method == METHOD_GPIO_24XX) {
		/* Disable wake-up during idle for dynamic tick */
		void __iomem *reg = bank->base + OMAP24XX_GPIO_CLEARWKUENA;
		__raw_writel(1 << offset, reg);
	}
#endif
	if (!cpu_class_is_omap1()) {
		bank->mod_usage &= ~(1 << offset);
		if (!bank->mod_usage) {
			u32 ctrl;
			ctrl = __raw_readl(bank->base + OMAP24XX_GPIO_CTRL);
			/* Module is disabled, clocks are gated */
			ctrl |= 1;
			__raw_writel(ctrl, bank->base + OMAP24XX_GPIO_CTRL);
		}
	}
	_reset_gpio(bank, bank->chip.base + offset);
	spin_unlock_irqrestore(&bank->lock, flags);
}

/*
 * 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 irq_desc *desc)
{
	void __iomem *isr_reg = NULL;
	u32 isr;
	unsigned int gpio_irq, gpio_index;
	struct gpio_bank *bank;
	u32 retrigger = 0;
	int unmasked = 0;

	desc->chip->ack(irq);

	bank = get_irq_data(irq);
#ifdef CONFIG_ARCH_OMAP1
	if (bank->method == METHOD_MPUIO)
		isr_reg = bank->base + OMAP_MPUIO_GPIO_INT;
#endif
#ifdef CONFIG_ARCH_OMAP15XX
	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
#if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850)
	if (bank->method == METHOD_GPIO_7XX)
		isr_reg = bank->base + OMAP7XX_GPIO_INT_STATUS;
#endif
#if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
	if (bank->method == METHOD_GPIO_24XX)
		isr_reg = bank->base + OMAP24XX_GPIO_IRQSTATUS1;
#endif
#if defined(CONFIG_ARCH_OMAP4)
	if (bank->method == METHOD_GPIO_24XX)
		isr_reg = bank->base + OMAP4_GPIO_IRQSTATUS0;
#endif
	while(1) {
		u32 isr_saved, level_mask = 0;
		u32 enabled;

		enabled = _get_gpio_irqbank_mask(bank);
		isr_saved = isr = __raw_readl(isr_reg) & enabled;

		if (cpu_is_omap15xx() && (bank->method == METHOD_MPUIO))
			isr &= 0x0000ffff;

		if (cpu_class_is_omap2()) {
			level_mask = bank->level_mask & enabled;
		}

		/* clear edge sensitive interrupts before handler(s) are
		called so that we don't miss any interrupt occurred while
		executing them */
		_enable_gpio_irqbank(bank, isr_saved & ~level_mask, 0);
		_clear_gpio_irqbank(bank, isr_saved & ~level_mask);
		_enable_gpio_irqbank(bank, isr_saved & ~level_mask, 1);

		/* if there is only edge sensitive GPIO pin interrupts
		configured, we could unmask GPIO bank interrupt immediately */
		if (!level_mask && !unmasked) {
			unmasked = 1;
			desc->chip->unmask(irq);
		}

		isr |= retrigger;
		retrigger = 0;
		if (!isr)
			break;

		gpio_irq = bank->virtual_irq_start;
		for (; isr != 0; isr >>= 1, gpio_irq++) {
			gpio_index = get_gpio_index(irq_to_gpio(gpio_irq));

			if (!(isr & 1))
				continue;

#ifdef CONFIG_ARCH_OMAP1
			/*
			 * Some chips can't respond to both rising and falling
			 * at the same time.  If this irq was requested with
			 * both flags, we need to flip the ICR data for the IRQ
			 * to respond to the IRQ for the opposite direction.
			 * This will be indicated in the bank toggle_mask.
			 */
			if (bank->toggle_mask & (1 << gpio_index))
				_toggle_gpio_edge_triggering(bank, gpio_index);
#endif

			generic_handle_irq(gpio_irq);
		}
	}
	/* if bank has any level sensitive GPIO pin interrupt
	configured, we must unmask the bank interrupt only after
	handler(s) are executed in order to avoid spurious bank
	interrupt */
	if (!unmasked)
		desc->chip->unmask(irq);

}

static void gpio_irq_shutdown(unsigned int irq)
{
	unsigned int gpio = irq - IH_GPIO_BASE;
	struct gpio_bank *bank = get_irq_chip_data(irq);

	_reset_gpio(bank, gpio);
}

static void gpio_ack_irq(unsigned int irq)
{
	unsigned int gpio = irq - IH_GPIO_BASE;
	struct gpio_bank *bank = get_irq_chip_data(irq);

	_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_irq_chip_data(irq);

	_set_gpio_irqenable(bank, gpio, 0);
	_set_gpio_triggering(bank, get_gpio_index(gpio), IRQ_TYPE_NONE);
}

static void gpio_unmask_irq(unsigned int irq)
{
	unsigned int gpio = irq - IH_GPIO_BASE;
	struct gpio_bank *bank = get_irq_chip_data(irq);
	unsigned int irq_mask = 1 << get_gpio_index(gpio);
	struct irq_desc *desc = irq_to_desc(irq);
	u32 trigger = desc->status & IRQ_TYPE_SENSE_MASK;

	if (trigger)
		_set_gpio_triggering(bank, get_gpio_index(gpio), trigger);

	/* For level-triggered GPIOs, the clearing must be done after
	 * the HW source is cleared, thus after the handler has run */
	if (bank->level_mask & irq_mask) {
		_set_gpio_irqenable(bank, gpio, 0);
		_clear_gpio_irqstatus(bank, gpio);
	}

	_set_gpio_irqenable(bank, gpio, 1);
}

static struct irq_chip gpio_irq_chip = {
	.name		= "GPIO",
	.shutdown	= gpio_irq_shutdown,
	.ack		= gpio_ack_irq,
	.mask		= gpio_mask_irq,
	.unmask		= gpio_unmask_irq,
	.set_type	= gpio_irq_type,
	.set_wake	= gpio_wake_enable,
};

/*---------------------------------------------------------------------*/

#ifdef CONFIG_ARCH_OMAP1

/* MPUIO uses the always-on 32k clock */

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_irq_chip_data(irq);

	_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_irq_chip_data(irq);

	_set_gpio_irqenable(bank, gpio, 1);
}

static struct irq_chip mpuio_irq_chip = {
	.name		= "MPUIO",
	.ack		= mpuio_ack_irq,
	.mask		= mpuio_mask_irq,
	.unmask		= mpuio_unmask_irq,
	.set_type	= gpio_irq_type,
#ifdef CONFIG_ARCH_OMAP16XX
	/* REVISIT: assuming only 16xx supports MPUIO wake events */
	.set_wake	= gpio_wake_enable,
#endif
};


#define bank_is_mpuio(bank)	((bank)->method == METHOD_MPUIO)


#ifdef CONFIG_ARCH_OMAP16XX

#include <linux/platform_device.h>

static int omap_mpuio_suspend_noirq(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct gpio_bank	*bank = platform_get_drvdata(pdev);
	void __iomem		*mask_reg = bank->base + OMAP_MPUIO_GPIO_MASKIT;
	unsigned long		flags;

	spin_lock_irqsave(&bank->lock, flags);
	bank->saved_wakeup = __raw_readl(mask_reg);
	__raw_writel(0xffff & ~bank->suspend_wakeup, mask_reg);
	spin_unlock_irqrestore(&bank->lock, flags);

	return 0;
}

static int omap_mpuio_resume_noirq(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct gpio_bank	*bank = platform_get_drvdata(pdev);
	void __iomem		*mask_reg = bank->base + OMAP_MPUIO_GPIO_MASKIT;
	unsigned long		flags;

	spin_lock_irqsave(&bank->lock, flags);
	__raw_writel(bank->saved_wakeup, mask_reg);
	spin_unlock_irqrestore(&bank->lock, flags);

	return 0;
}

static const struct dev_pm_ops omap_mpuio_dev_pm_ops = {
	.suspend_noirq = omap_mpuio_suspend_noirq,
	.resume_noirq = omap_mpuio_resume_noirq,
};

/* use platform_driver for this, now that there's no longer any
 * point to sys_device (other than not disturbing old code).
 */
static struct platform_driver omap_mpuio_driver = {
	.driver		= {
		.name	= "mpuio",
		.pm	= &omap_mpuio_dev_pm_ops,
	},
};

static struct platform_device omap_mpuio_device = {
	.name		= "mpuio",
	.id		= -1,
	.dev = {
		.driver = &omap_mpuio_driver.driver,
	}
	/* could list the /proc/iomem resources */
};

static inline void mpuio_init(void)
{
	platform_set_drvdata(&omap_mpuio_device, &gpio_bank_1610[0]);

	if (platform_driver_register(&omap_mpuio_driver) == 0)
		(void) platform_device_register(&omap_mpuio_device);
}

#else
static inline void mpuio_init(void) {}
#endif	/* 16xx */

#else

extern struct irq_chip mpuio_irq_chip;

#define bank_is_mpuio(bank)	0
static inline void mpuio_init(void) {}

#endif

/*---------------------------------------------------------------------*/

/* REVISIT these are stupid implementations!  replace by ones that
 * don't switch on METHOD_* and which mostly avoid spinlocks
 */

static int gpio_input(struct gpio_chip *chip, unsigned offset)
{
	struct gpio_bank *bank;
	unsigned long flags;

	bank = container_of(chip, struct gpio_bank, chip);
	spin_lock_irqsave(&bank->lock, flags);
	_set_gpio_direction(bank, offset, 1);
	spin_unlock_irqrestore(&bank->lock, flags);
	return 0;
}

static int gpio_is_input(struct gpio_bank *bank, int mask)
{
	void __iomem *reg = bank->base;

	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_7XX:
		reg += OMAP7XX_GPIO_DIR_CONTROL;
		break;
	case METHOD_GPIO_24XX:
		reg += OMAP24XX_GPIO_OE;
		break;
	}
	return __raw_readl(reg) & mask;
}

static int gpio_get(struct gpio_chip *chip, unsigned offset)
{
	struct gpio_bank *bank;
	void __iomem *reg;
	int gpio;
	u32 mask;

	gpio = chip->base + offset;
	bank = get_gpio_bank(gpio);
	reg = bank->base;
	mask = 1 << get_gpio_index(gpio);

	if (gpio_is_input(bank, mask))
		return _get_gpio_datain(bank, gpio);
	else
		return _get_gpio_dataout(bank, gpio);
}

static int gpio_output(struct gpio_chip *chip, unsigned offset, int value)
{
	struct gpio_bank *bank;
	unsigned long flags;

	bank = container_of(chip, struct gpio_bank, chip);
	spin_lock_irqsave(&bank->lock, flags);
	_set_gpio_dataout(bank, offset, value);
	_set_gpio_direction(bank, offset, 0);
	spin_unlock_irqrestore(&bank->lock, flags);
	return 0;
}

static void gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
	struct gpio_bank *bank;
	unsigned long flags;

	bank = container_of(chip, struct gpio_bank, chip);
	spin_lock_irqsave(&bank->lock, flags);
	_set_gpio_dataout(bank, offset, value);
	spin_unlock_irqrestore(&bank->lock, flags);
}

static int gpio_2irq(struct gpio_chip *chip, unsigned offset)
{
	struct gpio_bank *bank;

	bank = container_of(chip, struct gpio_bank, chip);
	return bank->virtual_irq_start + offset;
}

/*---------------------------------------------------------------------*/

static int initialized;
#if defined(CONFIG_ARCH_OMAP1) || defined(CONFIG_ARCH_OMAP2)
static struct clk * gpio_ick;
#endif

#if defined(CONFIG_ARCH_OMAP2)
static struct clk * gpio_fck;
#endif

#if defined(CONFIG_ARCH_OMAP2430)
static struct clk * gpio5_ick;
static struct clk * gpio5_fck;
#endif

#if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_ARCH_OMAP4)
static struct clk *gpio_iclks[OMAP34XX_NR_GPIOS];
#endif

static void __init omap_gpio_show_rev(void)
{
	u32 rev;

	if (cpu_is_omap16xx())
		rev = __raw_readw(gpio_bank[1].base + OMAP1610_GPIO_REVISION);
	else if (cpu_is_omap24xx() || cpu_is_omap34xx())
		rev = __raw_readl(gpio_bank[0].base + OMAP24XX_GPIO_REVISION);
	else if (cpu_is_omap44xx())
		rev = __raw_readl(gpio_bank[0].base + OMAP4_GPIO_REVISION);
	else
		return;

	printk(KERN_INFO "OMAP GPIO hardware version %d.%d\n",
		(rev >> 4) & 0x0f, rev & 0x0f);
}

/* This lock class tells lockdep that GPIO irqs are in a different
 * category than their parents, so it won't report false recursion.
 */
static struct lock_class_key gpio_lock_class;

static int __init _omap_gpio_init(void)
{
	int i;
	int gpio = 0;
	struct gpio_bank *bank;
	int bank_size = SZ_8K;	/* Module 4KB + L4 4KB except on omap1 */
	char clk_name[11];

	initialized = 1;

#if defined(CONFIG_ARCH_OMAP1)
	if (cpu_is_omap15xx()) {
		gpio_ick = clk_get(NULL, "arm_gpio_ck");
		if (IS_ERR(gpio_ick))
			printk("Could not get arm_gpio_ck\n");
		else
			clk_enable(gpio_ick);
	}
#endif
#if defined(CONFIG_ARCH_OMAP2)
	if (cpu_class_is_omap2()) {
		gpio_ick = clk_get(NULL, "gpios_ick");
		if (IS_ERR(gpio_ick))
			printk("Could not get gpios_ick\n");
		else
			clk_enable(gpio_ick);
		gpio_fck = clk_get(NULL, "gpios_fck");
		if (IS_ERR(gpio_fck))
			printk("Could not get gpios_fck\n");
		else
			clk_enable(gpio_fck);

		/*
		 * On 2430 & 3430 GPIO 5 uses CORE L4 ICLK
		 */
#if defined(CONFIG_ARCH_OMAP2430)
		if (cpu_is_omap2430()) {
			gpio5_ick = clk_get(NULL, "gpio5_ick");
			if (IS_ERR(gpio5_ick))
				printk("Could not get gpio5_ick\n");
			else
				clk_enable(gpio5_ick);
			gpio5_fck = clk_get(NULL, "gpio5_fck");
			if (IS_ERR(gpio5_fck))
				printk("Could not get gpio5_fck\n");
			else
				clk_enable(gpio5_fck);
		}
#endif
	}
#endif

#if defined(CONFIG_ARCH_OMAP3) || defined(CONFIG_ARCH_OMAP4)
	if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
		for (i = 0; i < OMAP34XX_NR_GPIOS; i++) {
			sprintf(clk_name, "gpio%d_ick", i + 1);
			gpio_iclks[i] = clk_get(NULL, clk_name);
			if (IS_ERR(gpio_iclks[i]))
				printk(KERN_ERR "Could not get %s\n", clk_name);
			else
				clk_enable(gpio_iclks[i]);
		}
	}
#endif


#ifdef CONFIG_ARCH_OMAP15XX
	if (cpu_is_omap15xx()) {
		gpio_bank_count = 2;
		gpio_bank = gpio_bank_1510;
		bank_size = SZ_2K;
	}
#endif
#if defined(CONFIG_ARCH_OMAP16XX)
	if (cpu_is_omap16xx()) {
		gpio_bank_count = 5;
		gpio_bank = gpio_bank_1610;
		bank_size = SZ_2K;
	}
#endif
#if defined(CONFIG_ARCH_OMAP730) || defined(CONFIG_ARCH_OMAP850)
	if (cpu_is_omap7xx()) {
		gpio_bank_count = 7;
		gpio_bank = gpio_bank_7xx;
		bank_size = SZ_2K;
	}
#endif
#ifdef CONFIG_ARCH_OMAP2
	if (cpu_is_omap242x()) {
		gpio_bank_count = 4;
		gpio_bank = gpio_bank_242x;
	}
	if (cpu_is_omap243x()) {
		gpio_bank_count = 5;
		gpio_bank = gpio_bank_243x;
	}
#endif
#ifdef CONFIG_ARCH_OMAP3
	if (cpu_is_omap34xx()) {
		gpio_bank_count = OMAP34XX_NR_GPIOS;
		gpio_bank = gpio_bank_34xx;
	}
#endif
#ifdef CONFIG_ARCH_OMAP4
	if (cpu_is_omap44xx()) {
		gpio_bank_count = OMAP34XX_NR_GPIOS;
		gpio_bank = gpio_bank_44xx;
	}
#endif
	for (i = 0; i < gpio_bank_count; i++) {
		int j, gpio_count = 16;

		bank = &gpio_bank[i];
		spin_lock_init(&bank->lock);

		/* Static mapping, never released */
		bank->base = ioremap(bank->pbase, bank_size);
		if (!bank->base) {
			printk(KERN_ERR "Could not ioremap gpio bank%i\n", i);
			continue;
		}

		if (bank_is_mpuio(bank))
			__raw_writew(0xffff, bank->base + OMAP_MPUIO_GPIO_MASKIT);
		if (cpu_is_omap15xx() && bank->method == METHOD_GPIO_1510) {
			__raw_writew(0xffff, bank->base + OMAP1510_GPIO_INT_MASK);
			__raw_writew(0x0000, bank->base + OMAP1510_GPIO_INT_STATUS);
		}
		if (cpu_is_omap16xx() && bank->method == METHOD_GPIO_1610) {
			__raw_writew(0x0000, bank->base + OMAP1610_GPIO_IRQENABLE1);
			__raw_writew(0xffff, bank->base + OMAP1610_GPIO_IRQSTATUS1);
			__raw_writew(0x0014, bank->base + OMAP1610_GPIO_SYSCONFIG);
		}
		if (cpu_is_omap7xx() && bank->method == METHOD_GPIO_7XX) {
			__raw_writel(0xffffffff, bank->base + OMAP7XX_GPIO_INT_MASK);
			__raw_writel(0x00000000, bank->base + OMAP7XX_GPIO_INT_STATUS);

			gpio_count = 32; /* 7xx has 32-bit GPIOs */
		}

#ifdef CONFIG_ARCH_OMAP2PLUS
		if (bank->method == METHOD_GPIO_24XX) {
			static const u32 non_wakeup_gpios[] = {
				0xe203ffc0, 0x08700040
			};
		if (cpu_is_omap44xx()) {
			__raw_writel(0xffffffff, bank->base +
						OMAP4_GPIO_IRQSTATUSCLR0);
			__raw_writew(0x0015, bank->base +
						OMAP4_GPIO_SYSCONFIG);
			__raw_writel(0x00000000, bank->base +
						 OMAP4_GPIO_DEBOUNCENABLE);
			/* Initialize interface clock ungated, module enabled */
			__raw_writel(0, bank->base + OMAP4_GPIO_CTRL);
		} else {
			__raw_writel(0x00000000, bank->base + OMAP24XX_GPIO_IRQENABLE1);
			__raw_writel(0xffffffff, bank->base + OMAP24XX_GPIO_IRQSTATUS1);
			__raw_writew(0x0015, bank->base + OMAP24XX_GPIO_SYSCONFIG);
			__raw_writel(0x00000000, bank->base + OMAP24XX_GPIO_DEBOUNCE_EN);

			/* Initialize interface clock ungated, module enabled */
			__raw_writel(0, bank->base + OMAP24XX_GPIO_CTRL);
		}
			if (i < ARRAY_SIZE(non_wakeup_gpios))
				bank->non_wakeup_gpios = non_wakeup_gpios[i];
			gpio_count = 32;
		}
#endif

		bank->mod_usage = 0;
		/* REVISIT eventually switch from OMAP-specific gpio structs
		 * over to the generic ones
		 */
		bank->chip.request = omap_gpio_request;
		bank->chip.free = omap_gpio_free;
		bank->chip.direction_input = gpio_input;
		bank->chip.get = gpio_get;
		bank->chip.direction_output = gpio_output;
		bank->chip.set = gpio_set;
		bank->chip.to_irq = gpio_2irq;
		if (bank_is_mpuio(bank)) {
			bank->chip.label = "mpuio";
#ifdef CONFIG_ARCH_OMAP16XX
			bank->chip.dev = &omap_mpuio_device.dev;
#endif
			bank->chip.base = OMAP_MPUIO(0);
		} else {
			bank->chip.label = "gpio";
			bank->chip.base = gpio;
			gpio += gpio_count;
		}
		bank->chip.ngpio = gpio_count;

		gpiochip_add(&bank->chip);

		for (j = bank->virtual_irq_start;
		     j < bank->virtual_irq_start + gpio_count; j++) {
			lockdep_set_class(&irq_desc[j].lock, &gpio_lock_class);
			set_irq_chip_data(j, bank);
			if (bank_is_mpuio(bank))
				set_irq_chip(j, &mpuio_irq_chip);
			else
				set_irq_chip(j, &gpio_irq_chip);
			set_irq_handler(j, handle_simple_irq);
			set_irq_flags(j, IRQF_VALID);
		}
		set_irq_chained_handler(bank->irq, gpio_irq_handler);
		set_irq_data(bank->irq, bank);

		if (cpu_is_omap34xx() || cpu_is_omap44xx()) {
			sprintf(clk_name, "gpio%d_dbck", i + 1);
			bank->dbck = clk_get(NULL, clk_name);
			if (IS_ERR(bank->dbck))
				printk(KERN_ERR "Could not get %s\n", clk_name);
		}
	}

	/* Enable system clock for GPIO module.
	 * The CAM_CLK_CTRL *is* really the right place. */
	if (cpu_is_omap16xx())
		omap_writel(omap_readl(ULPD_CAM_CLK_CTRL) | 0x04, ULPD_CAM_CLK_CTRL);

	/* Enable autoidle for the OCP interface */
	if (cpu_is_omap24xx())
		omap_writel(1 << 0, 0x48019010);
	if (cpu_is_omap34xx())
		omap_writel(1 << 0, 0x48306814);

	omap_gpio_show_rev();

	return 0;
}

#if defined(CONFIG_ARCH_OMAP16XX) || defined(CONFIG_ARCH_OMAP2PLUS)
static int omap_gpio_suspend(struct sys_device *dev, pm_message_t mesg)
{
	int i;

	if (!cpu_class_is_omap2() && !cpu_is_omap16xx())
		return 0;

	for (i = 0; i < gpio_bank_count; i++) {
		struct gpio_bank *bank = &gpio_bank[i];
		void __iomem *wake_status;
		void __iomem *wake_clear;
		void __iomem *wake_set;
		unsigned long flags;

		switch (bank->method) {
#ifdef CONFIG_ARCH_OMAP16XX
		case METHOD_GPIO_1610:
			wake_status = bank->base + OMAP1610_GPIO_WAKEUPENABLE;
			wake_clear = bank->base + OMAP1610_GPIO_CLEAR_WAKEUPENA;
			wake_set = bank->base + OMAP1610_GPIO_SET_WAKEUPENA;
			break;
#endif
#if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
		case METHOD_GPIO_24XX:
			wake_status = bank->base + OMAP24XX_GPIO_WAKE_EN;
			wake_clear = bank->base + OMAP24XX_GPIO_CLEARWKUENA;
			wake_set = bank->base + OMAP24XX_GPIO_SETWKUENA;
			break;
#endif
#ifdef CONFIG_ARCH_OMAP4
		case METHOD_GPIO_24XX:
			wake_status = bank->base + OMAP4_GPIO_IRQWAKEN0;
			wake_clear = bank->base + OMAP4_GPIO_IRQWAKEN0;
			wake_set = bank->base + OMAP4_GPIO_IRQWAKEN0;
			break;
#endif
		default:
			continue;
		}

		spin_lock_irqsave(&bank->lock, flags);
		bank->saved_wakeup = __raw_readl(wake_status);
		__raw_writel(0xffffffff, wake_clear);
		__raw_writel(bank->suspend_wakeup, wake_set);
		spin_unlock_irqrestore(&bank->lock, flags);
	}

	return 0;
}

static int omap_gpio_resume(struct sys_device *dev)
{
	int i;

	if (!cpu_class_is_omap2() && !cpu_is_omap16xx())
		return 0;

	for (i = 0; i < gpio_bank_count; i++) {
		struct gpio_bank *bank = &gpio_bank[i];
		void __iomem *wake_clear;
		void __iomem *wake_set;
		unsigned long flags;

		switch (bank->method) {
#ifdef CONFIG_ARCH_OMAP16XX
		case METHOD_GPIO_1610:
			wake_clear = bank->base + OMAP1610_GPIO_CLEAR_WAKEUPENA;
			wake_set = bank->base + OMAP1610_GPIO_SET_WAKEUPENA;
			break;
#endif
#if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
		case METHOD_GPIO_24XX:
			wake_clear = bank->base + OMAP24XX_GPIO_CLEARWKUENA;
			wake_set = bank->base + OMAP24XX_GPIO_SETWKUENA;
			break;
#endif
#ifdef CONFIG_ARCH_OMAP4
		case METHOD_GPIO_24XX:
			wake_clear = bank->base + OMAP4_GPIO_IRQWAKEN0;
			wake_set = bank->base + OMAP4_GPIO_IRQWAKEN0;
			break;
#endif
		default:
			continue;
		}

		spin_lock_irqsave(&bank->lock, flags);
		__raw_writel(0xffffffff, wake_clear);
		__raw_writel(bank->saved_wakeup, wake_set);
		spin_unlock_irqrestore(&bank->lock, flags);
	}

	return 0;
}

static struct sysdev_class omap_gpio_sysclass = {
	.name		= "gpio",
	.suspend	= omap_gpio_suspend,
	.resume		= omap_gpio_resume,
};

static struct sys_device omap_gpio_device = {
	.id		= 0,
	.cls		= &omap_gpio_sysclass,
};

#endif

#ifdef CONFIG_ARCH_OMAP2PLUS

static int workaround_enabled;

void omap2_gpio_prepare_for_retention(void)
{
	int i, c = 0;

	/* Remove triggering for all non-wakeup GPIOs.  Otherwise spurious
	 * IRQs will be generated.  See OMAP2420 Errata item 1.101. */
	for (i = 0; i < gpio_bank_count; i++) {
		struct gpio_bank *bank = &gpio_bank[i];
		u32 l1, l2;

		if (!(bank->enabled_non_wakeup_gpios))
			continue;
#if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
		bank->saved_datain = __raw_readl(bank->base + OMAP24XX_GPIO_DATAIN);
		l1 = __raw_readl(bank->base + OMAP24XX_GPIO_FALLINGDETECT);
		l2 = __raw_readl(bank->base + OMAP24XX_GPIO_RISINGDETECT);
#endif
#ifdef CONFIG_ARCH_OMAP4
		bank->saved_datain = __raw_readl(bank->base +
							OMAP4_GPIO_DATAIN);
		l1 = __raw_readl(bank->base + OMAP4_GPIO_FALLINGDETECT);
		l2 = __raw_readl(bank->base + OMAP4_GPIO_RISINGDETECT);
#endif
		bank->saved_fallingdetect = l1;
		bank->saved_risingdetect = l2;
		l1 &= ~bank->enabled_non_wakeup_gpios;
		l2 &= ~bank->enabled_non_wakeup_gpios;
#if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
		__raw_writel(l1, bank->base + OMAP24XX_GPIO_FALLINGDETECT);
		__raw_writel(l2, bank->base + OMAP24XX_GPIO_RISINGDETECT);
#endif
#ifdef CONFIG_ARCH_OMAP4
		__raw_writel(l1, bank->base + OMAP4_GPIO_FALLINGDETECT);
		__raw_writel(l2, bank->base + OMAP4_GPIO_RISINGDETECT);
#endif
		c++;
	}
	if (!c) {
		workaround_enabled = 0;
		return;
	}
	workaround_enabled = 1;
}

void omap2_gpio_resume_after_retention(void)
{
	int i;

	if (!workaround_enabled)
		return;
	for (i = 0; i < gpio_bank_count; i++) {
		struct gpio_bank *bank = &gpio_bank[i];
		u32 l, gen, gen0, gen1;

		if (!(bank->enabled_non_wakeup_gpios))
			continue;
#if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
		__raw_writel(bank->saved_fallingdetect,
				 bank->base + OMAP24XX_GPIO_FALLINGDETECT);
		__raw_writel(bank->saved_risingdetect,
				 bank->base + OMAP24XX_GPIO_RISINGDETECT);
		l = __raw_readl(bank->base + OMAP24XX_GPIO_DATAIN);
#endif
#ifdef CONFIG_ARCH_OMAP4
		__raw_writel(bank->saved_fallingdetect,
				 bank->base + OMAP4_GPIO_FALLINGDETECT);
		__raw_writel(bank->saved_risingdetect,
				 bank->base + OMAP4_GPIO_RISINGDETECT);
		l = __raw_readl(bank->base + OMAP4_GPIO_DATAIN);
#endif
		/* Check if any of the non-wakeup interrupt GPIOs have changed
		 * state.  If so, generate an IRQ by software.  This is
		 * horribly racy, but it's the best we can do to work around
		 * this silicon bug. */
		l ^= bank->saved_datain;
		l &= bank->non_wakeup_gpios;

		/*
		 * No need to generate IRQs for the rising edge for gpio IRQs
		 * configured with falling edge only; and vice versa.
		 */
		gen0 = l & bank->saved_fallingdetect;
		gen0 &= bank->saved_datain;

		gen1 = l & bank->saved_risingdetect;
		gen1 &= ~(bank->saved_datain);

		/* FIXME: Consider GPIO IRQs with level detections properly! */
		gen = l & (~(bank->saved_fallingdetect) &
				~(bank->saved_risingdetect));
		/* Consider all GPIO IRQs needed to be updated */
		gen |= gen0 | gen1;

		if (gen) {
			u32 old0, old1;
#if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
			old0 = __raw_readl(bank->base + OMAP24XX_GPIO_LEVELDETECT0);
			old1 = __raw_readl(bank->base + OMAP24XX_GPIO_LEVELDETECT1);
			__raw_writel(old0 | gen, bank->base +
					OMAP24XX_GPIO_LEVELDETECT0);
			__raw_writel(old1 | gen, bank->base +
					OMAP24XX_GPIO_LEVELDETECT1);
			__raw_writel(old0, bank->base + OMAP24XX_GPIO_LEVELDETECT0);
			__raw_writel(old1, bank->base + OMAP24XX_GPIO_LEVELDETECT1);
#endif
#ifdef CONFIG_ARCH_OMAP4
			old0 = __raw_readl(bank->base +
						OMAP4_GPIO_LEVELDETECT0);
			old1 = __raw_readl(bank->base +
						OMAP4_GPIO_LEVELDETECT1);
			__raw_writel(old0 | l, bank->base +
						OMAP4_GPIO_LEVELDETECT0);
			__raw_writel(old1 | l, bank->base +
						OMAP4_GPIO_LEVELDETECT1);
			__raw_writel(old0, bank->base +
						OMAP4_GPIO_LEVELDETECT0);
			__raw_writel(old1, bank->base +
						OMAP4_GPIO_LEVELDETECT1);
#endif
		}
	}

}

#endif

#ifdef CONFIG_ARCH_OMAP3
/* save the registers of bank 2-6 */
void omap_gpio_save_context(void)
{
	int i;

	/* saving banks from 2-6 only since GPIO1 is in WKUP */
	for (i = 1; i < gpio_bank_count; i++) {
		struct gpio_bank *bank = &gpio_bank[i];
		gpio_context[i].sysconfig =
			__raw_readl(bank->base + OMAP24XX_GPIO_SYSCONFIG);
		gpio_context[i].irqenable1 =
			__raw_readl(bank->base + OMAP24XX_GPIO_IRQENABLE1);
		gpio_context[i].irqenable2 =
			__raw_readl(bank->base + OMAP24XX_GPIO_IRQENABLE2);
		gpio_context[i].wake_en =
			__raw_readl(bank->base + OMAP24XX_GPIO_WAKE_EN);
		gpio_context[i].ctrl =
			__raw_readl(bank->base + OMAP24XX_GPIO_CTRL);
		gpio_context[i].oe =
			__raw_readl(bank->base + OMAP24XX_GPIO_OE);
		gpio_context[i].leveldetect0 =
			__raw_readl(bank->base + OMAP24XX_GPIO_LEVELDETECT0);
		gpio_context[i].leveldetect1 =
			__raw_readl(bank->base + OMAP24XX_GPIO_LEVELDETECT1);
		gpio_context[i].risingdetect =
			__raw_readl(bank->base + OMAP24XX_GPIO_RISINGDETECT);
		gpio_context[i].fallingdetect =
			__raw_readl(bank->base + OMAP24XX_GPIO_FALLINGDETECT);
		gpio_context[i].dataout =
			__raw_readl(bank->base + OMAP24XX_GPIO_DATAOUT);
		gpio_context[i].setwkuena =
			__raw_readl(bank->base + OMAP24XX_GPIO_SETWKUENA);
		gpio_context[i].setdataout =
			__raw_readl(bank->base + OMAP24XX_GPIO_SETDATAOUT);
	}
}

/* restore the required registers of bank 2-6 */
void omap_gpio_restore_context(void)
{
	int i;

	for (i = 1; i < gpio_bank_count; i++) {
		struct gpio_bank *bank = &gpio_bank[i];
		__raw_writel(gpio_context[i].sysconfig,
				bank->base + OMAP24XX_GPIO_SYSCONFIG);
		__raw_writel(gpio_context[i].irqenable1,
				bank->base + OMAP24XX_GPIO_IRQENABLE1);
		__raw_writel(gpio_context[i].irqenable2,
				bank->base + OMAP24XX_GPIO_IRQENABLE2);
		__raw_writel(gpio_context[i].wake_en,
				bank->base + OMAP24XX_GPIO_WAKE_EN);
		__raw_writel(gpio_context[i].ctrl,
				bank->base + OMAP24XX_GPIO_CTRL);
		__raw_writel(gpio_context[i].oe,
				bank->base + OMAP24XX_GPIO_OE);
		__raw_writel(gpio_context[i].leveldetect0,
				bank->base + OMAP24XX_GPIO_LEVELDETECT0);
		__raw_writel(gpio_context[i].leveldetect1,
				bank->base + OMAP24XX_GPIO_LEVELDETECT1);
		__raw_writel(gpio_context[i].risingdetect,
				bank->base + OMAP24XX_GPIO_RISINGDETECT);
		__raw_writel(gpio_context[i].fallingdetect,
				bank->base + OMAP24XX_GPIO_FALLINGDETECT);
		__raw_writel(gpio_context[i].dataout,
				bank->base + OMAP24XX_GPIO_DATAOUT);
		__raw_writel(gpio_context[i].setwkuena,
				bank->base + OMAP24XX_GPIO_SETWKUENA);
		__raw_writel(gpio_context[i].setdataout,
				bank->base + OMAP24XX_GPIO_SETDATAOUT);
	}
}
#endif

/*
 * This may get called early from board specific init
 * for boards that have interrupts routed via FPGA.
 */
int __init omap_gpio_init(void)
{
	if (!initialized)
		return _omap_gpio_init();
	else
		return 0;
}

static int __init omap_gpio_sysinit(void)
{
	int ret = 0;

	if (!initialized)
		ret = _omap_gpio_init();

	mpuio_init();

#if defined(CONFIG_ARCH_OMAP16XX) || defined(CONFIG_ARCH_OMAP2PLUS)
	if (cpu_is_omap16xx() || cpu_class_is_omap2()) {
		if (ret == 0) {
			ret = sysdev_class_register(&omap_gpio_sysclass);
			if (ret == 0)
				ret = sysdev_register(&omap_gpio_device);
		}
	}
#endif

	return ret;
}

arch_initcall(omap_gpio_sysinit);


#ifdef	CONFIG_DEBUG_FS

#include <linux/debugfs.h>
#include <linux/seq_file.h>

static int dbg_gpio_show(struct seq_file *s, void *unused)
{
	unsigned	i, j, gpio;

	for (i = 0, gpio = 0; i < gpio_bank_count; i++) {
		struct gpio_bank	*bank = gpio_bank + i;
		unsigned		bankwidth = 16;
		u32			mask = 1;

		if (bank_is_mpuio(bank))
			gpio = OMAP_MPUIO(0);
		else if (cpu_class_is_omap2() || cpu_is_omap7xx())
			bankwidth = 32;

		for (j = 0; j < bankwidth; j++, gpio++, mask <<= 1) {
			unsigned	irq, value, is_in, irqstat;
			const char	*label;

			label = gpiochip_is_requested(&bank->chip, j);
			if (!label)
				continue;

			irq = bank->virtual_irq_start + j;
			value = gpio_get_value(gpio);
			is_in = gpio_is_input(bank, mask);

			if (bank_is_mpuio(bank))
				seq_printf(s, "MPUIO %2d ", j);
			else
				seq_printf(s, "GPIO %3d ", gpio);
			seq_printf(s, "(%-20.20s): %s %s",
					label,
					is_in ? "in " : "out",
					value ? "hi"  : "lo");

/* FIXME for at least omap2, show pullup/pulldown state */

			irqstat = irq_desc[irq].status;
#if defined(CONFIG_ARCH_OMAP16XX) || defined(CONFIG_ARCH_OMAP2PLUS)
			if (is_in && ((bank->suspend_wakeup & mask)
					|| irqstat & IRQ_TYPE_SENSE_MASK)) {
				char	*trigger = NULL;

				switch (irqstat & IRQ_TYPE_SENSE_MASK) {
				case IRQ_TYPE_EDGE_FALLING:
					trigger = "falling";
					break;
				case IRQ_TYPE_EDGE_RISING:
					trigger = "rising";
					break;
				case IRQ_TYPE_EDGE_BOTH:
					trigger = "bothedge";
					break;
				case IRQ_TYPE_LEVEL_LOW:
					trigger = "low";
					break;
				case IRQ_TYPE_LEVEL_HIGH:
					trigger = "high";
					break;
				case IRQ_TYPE_NONE:
					trigger = "(?)";
					break;
				}
				seq_printf(s, ", irq-%d %-8s%s",
						irq, trigger,
						(bank->suspend_wakeup & mask)
							? " wakeup" : "");
			}
#endif
			seq_printf(s, "\n");
		}

		if (bank_is_mpuio(bank)) {
			seq_printf(s, "\n");
			gpio = 0;
		}
	}
	return 0;
}

static int dbg_gpio_open(struct inode *inode, struct file *file)
{
	return single_open(file, dbg_gpio_show, &inode->i_private);
}

static const struct file_operations debug_fops = {
	.open		= dbg_gpio_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
};

static int __init omap_gpio_debuginit(void)
{
	(void) debugfs_create_file("omap_gpio", S_IRUGO,
					NULL, NULL, &debug_fops);
	return 0;
}
late_initcall(omap_gpio_debuginit);
#endif