[mirror_ubuntu-zesty-kernel.git] / arch / arm / plat-pxa / gpio.c

/*
 *  linux/arch/arm/plat-pxa/gpio.c
 *
 *  Generic PXA GPIO handling
 *
 *  Author:	Nicolas Pitre
 *  Created:	Jun 15, 2001
 *  Copyright:	MontaVista Software Inc.
 *
 *  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/irq.h>
#include <linux/io.h>
#include <linux/sysdev.h>
#include <linux/bootmem.h>

#include <mach/gpio.h>

int pxa_last_gpio;

struct pxa_gpio_chip {
	struct gpio_chip chip;
	void __iomem	*regbase;
	char label[10];

	unsigned long	irq_mask;
	unsigned long	irq_edge_rise;
	unsigned long	irq_edge_fall;

#ifdef CONFIG_PM
	unsigned long	saved_gplr;
	unsigned long	saved_gpdr;
	unsigned long	saved_grer;
	unsigned long	saved_gfer;
#endif
};

static DEFINE_SPINLOCK(gpio_lock);
static struct pxa_gpio_chip *pxa_gpio_chips;

#define for_each_gpio_chip(i, c)			\
	for (i = 0, c = &pxa_gpio_chips[0]; i <= pxa_last_gpio; i += 32, c++)

static inline void __iomem *gpio_chip_base(struct gpio_chip *c)
{
	return container_of(c, struct pxa_gpio_chip, chip)->regbase;
}

static inline struct pxa_gpio_chip *gpio_to_chip(unsigned gpio)
{
	return &pxa_gpio_chips[gpio_to_bank(gpio)];
}

static int pxa_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
	void __iomem *base = gpio_chip_base(chip);
	uint32_t value, mask = 1 << offset;
	unsigned long flags;

	spin_lock_irqsave(&gpio_lock, flags);

	value = __raw_readl(base + GPDR_OFFSET);
	if (__gpio_is_inverted(chip->base + offset))
		value |= mask;
	else
		value &= ~mask;
	__raw_writel(value, base + GPDR_OFFSET);

	spin_unlock_irqrestore(&gpio_lock, flags);
	return 0;
}

static int pxa_gpio_direction_output(struct gpio_chip *chip,
				     unsigned offset, int value)
{
	void __iomem *base = gpio_chip_base(chip);
	uint32_t tmp, mask = 1 << offset;
	unsigned long flags;

	__raw_writel(mask, base + (value ? GPSR_OFFSET : GPCR_OFFSET));

	spin_lock_irqsave(&gpio_lock, flags);

	tmp = __raw_readl(base + GPDR_OFFSET);
	if (__gpio_is_inverted(chip->base + offset))
		tmp &= ~mask;
	else
		tmp |= mask;
	__raw_writel(tmp, base + GPDR_OFFSET);

	spin_unlock_irqrestore(&gpio_lock, flags);
	return 0;
}

static int pxa_gpio_get(struct gpio_chip *chip, unsigned offset)
{
	return __raw_readl(gpio_chip_base(chip) + GPLR_OFFSET) & (1 << offset);
}

static void pxa_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
	__raw_writel(1 << offset, gpio_chip_base(chip) +
				(value ? GPSR_OFFSET : GPCR_OFFSET));
}

static int __init pxa_init_gpio_chip(int gpio_end)
{
	int i, gpio, nbanks = gpio_to_bank(gpio_end) + 1;
	struct pxa_gpio_chip *chips;

	/* this is early, we have to use bootmem allocator, and we really
	 * want this to be allocated dynamically for different 'gpio_end'
	 */
	chips = alloc_bootmem_low(nbanks * sizeof(struct pxa_gpio_chip));
	if (chips == NULL) {
		pr_err("%s: failed to allocate GPIO chips\n", __func__);
		return -ENOMEM;
	}

	memset(chips, 0, nbanks * sizeof(struct pxa_gpio_chip));

	for (i = 0, gpio = 0; i < nbanks; i++, gpio += 32) {
		struct gpio_chip *c = &chips[i].chip;

		sprintf(chips[i].label, "gpio-%d", i);
		chips[i].regbase = (void __iomem *)GPIO_BANK(i);

		c->base  = gpio;
		c->label = chips[i].label;

		c->direction_input  = pxa_gpio_direction_input;
		c->direction_output = pxa_gpio_direction_output;
		c->get = pxa_gpio_get;
		c->set = pxa_gpio_set;

		/* number of GPIOs on last bank may be less than 32 */
		c->ngpio = (gpio + 31 > gpio_end) ? (gpio_end - gpio + 1) : 32;
		gpiochip_add(c);
	}
	pxa_gpio_chips = chips;
	return 0;
}

/* Update only those GRERx and GFERx edge detection register bits if those
 * bits are set in c->irq_mask
 */
static inline void update_edge_detect(struct pxa_gpio_chip *c)
{
	uint32_t grer, gfer;

	grer = __raw_readl(c->regbase + GRER_OFFSET) & ~c->irq_mask;
	gfer = __raw_readl(c->regbase + GFER_OFFSET) & ~c->irq_mask;
	grer |= c->irq_edge_rise & c->irq_mask;
	gfer |= c->irq_edge_fall & c->irq_mask;
	__raw_writel(grer, c->regbase + GRER_OFFSET);
	__raw_writel(gfer, c->regbase + GFER_OFFSET);
}

static int pxa_gpio_irq_type(unsigned int irq, unsigned int type)
{
	struct pxa_gpio_chip *c;
	int gpio = irq_to_gpio(irq);
	unsigned long gpdr, mask = GPIO_bit(gpio);

	c = gpio_to_chip(gpio);

	if (type == IRQ_TYPE_PROBE) {
		/* Don't mess with enabled GPIOs using preconfigured edges or
		 * GPIOs set to alternate function or to output during probe
		 */
		if ((c->irq_edge_rise | c->irq_edge_fall) & GPIO_bit(gpio))
			return 0;

		if (__gpio_is_occupied(gpio))
			return 0;

		type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
	}

	gpdr = __raw_readl(c->regbase + GPDR_OFFSET);

	if (__gpio_is_inverted(gpio))
		__raw_writel(gpdr | mask,  c->regbase + GPDR_OFFSET);
	else
		__raw_writel(gpdr & ~mask, c->regbase + GPDR_OFFSET);

	if (type & IRQ_TYPE_EDGE_RISING)
		c->irq_edge_rise |= mask;
	else
		c->irq_edge_rise &= ~mask;

	if (type & IRQ_TYPE_EDGE_FALLING)
		c->irq_edge_fall |= mask;
	else
		c->irq_edge_fall &= ~mask;

	update_edge_detect(c);

	pr_debug("%s: IRQ%d (GPIO%d) - edge%s%s\n", __func__, irq, gpio,
		((type & IRQ_TYPE_EDGE_RISING)  ? " rising"  : ""),
		((type & IRQ_TYPE_EDGE_FALLING) ? " falling" : ""));
	return 0;
}

static void pxa_gpio_demux_handler(unsigned int irq, struct irq_desc *desc)
{
	struct pxa_gpio_chip *c;
	int loop, gpio, gpio_base, n;
	unsigned long gedr;

	do {
		loop = 0;
		for_each_gpio_chip(gpio, c) {
			gpio_base = c->chip.base;

			gedr = __raw_readl(c->regbase + GEDR_OFFSET);
			gedr = gedr & c->irq_mask;
			__raw_writel(gedr, c->regbase + GEDR_OFFSET);

			n = find_first_bit(&gedr, BITS_PER_LONG);
			while (n < BITS_PER_LONG) {
				loop = 1;

				generic_handle_irq(gpio_to_irq(gpio_base + n));
				n = find_next_bit(&gedr, BITS_PER_LONG, n + 1);
			}
		}
	} while (loop);
}

static void pxa_ack_muxed_gpio(unsigned int irq)
{
	int gpio = irq_to_gpio(irq);
	struct pxa_gpio_chip *c = gpio_to_chip(gpio);

	__raw_writel(GPIO_bit(gpio), c->regbase + GEDR_OFFSET);
}

static void pxa_mask_muxed_gpio(unsigned int irq)
{
	int gpio = irq_to_gpio(irq);
	struct pxa_gpio_chip *c = gpio_to_chip(gpio);
	uint32_t grer, gfer;

	c->irq_mask &= ~GPIO_bit(gpio);

	grer = __raw_readl(c->regbase + GRER_OFFSET) & ~GPIO_bit(gpio);
	gfer = __raw_readl(c->regbase + GFER_OFFSET) & ~GPIO_bit(gpio);
	__raw_writel(grer, c->regbase + GRER_OFFSET);
	__raw_writel(gfer, c->regbase + GFER_OFFSET);
}

static void pxa_unmask_muxed_gpio(unsigned int irq)
{
	int gpio = irq_to_gpio(irq);
	struct pxa_gpio_chip *c = gpio_to_chip(gpio);

	c->irq_mask |= GPIO_bit(gpio);
	update_edge_detect(c);
}

static struct irq_chip pxa_muxed_gpio_chip = {
	.name		= "GPIO",
	.ack		= pxa_ack_muxed_gpio,
	.mask		= pxa_mask_muxed_gpio,
	.unmask		= pxa_unmask_muxed_gpio,
	.set_type	= pxa_gpio_irq_type,
};

void __init pxa_init_gpio(int mux_irq, int start, int end, set_wake_t fn)
{
	struct pxa_gpio_chip *c;
	int gpio, irq;

	pxa_last_gpio = end;

	/* Initialize GPIO chips */
	pxa_init_gpio_chip(end);

	/* clear all GPIO edge detects */
	for_each_gpio_chip(gpio, c) {
		__raw_writel(0, c->regbase + GFER_OFFSET);
		__raw_writel(0, c->regbase + GRER_OFFSET);
		__raw_writel(~0,c->regbase + GEDR_OFFSET);
	}

	for (irq  = gpio_to_irq(start); irq <= gpio_to_irq(end); irq++) {
		set_irq_chip(irq, &pxa_muxed_gpio_chip);
		set_irq_handler(irq, handle_edge_irq);
		set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
	}

	/* Install handler for GPIO>=2 edge detect interrupts */
	set_irq_chained_handler(mux_irq, pxa_gpio_demux_handler);
	pxa_muxed_gpio_chip.set_wake = fn;
}

#ifdef CONFIG_PM
static int pxa_gpio_suspend(struct sys_device *dev, pm_message_t state)
{
	struct pxa_gpio_chip *c;
	int gpio;

	for_each_gpio_chip(gpio, c) {
		c->saved_gplr = __raw_readl(c->regbase + GPLR_OFFSET);
		c->saved_gpdr = __raw_readl(c->regbase + GPDR_OFFSET);
		c->saved_grer = __raw_readl(c->regbase + GRER_OFFSET);
		c->saved_gfer = __raw_readl(c->regbase + GFER_OFFSET);

		/* Clear GPIO transition detect bits */
		__raw_writel(0xffffffff, c->regbase + GEDR_OFFSET);
	}
	return 0;
}

static int pxa_gpio_resume(struct sys_device *dev)
{
	struct pxa_gpio_chip *c;
	int gpio;

	for_each_gpio_chip(gpio, c) {
		/* restore level with set/clear */
		__raw_writel( c->saved_gplr, c->regbase + GPSR_OFFSET);
		__raw_writel(~c->saved_gplr, c->regbase + GPCR_OFFSET);

		__raw_writel(c->saved_grer, c->regbase + GRER_OFFSET);
		__raw_writel(c->saved_gfer, c->regbase + GFER_OFFSET);
		__raw_writel(c->saved_gpdr, c->regbase + GPDR_OFFSET);
	}
	return 0;
}
#else
#define pxa_gpio_suspend	NULL
#define pxa_gpio_resume		NULL
#endif

struct sysdev_class pxa_gpio_sysclass = {
	.name		= "gpio",
	.suspend	= pxa_gpio_suspend,
	.resume		= pxa_gpio_resume,
};

static int __init pxa_gpio_init(void)
{
	return sysdev_class_register(&pxa_gpio_sysclass);
}

core_initcall(pxa_gpio_init);
Commit	Line	Data
1c44f5f1	1	/*
38f539a6	2	* linux/arch/arm/plat-pxa/gpio.c
1c44f5f1 PZ	3	*
	4	* Generic PXA GPIO handling
	5	*
	6	* Author: Nicolas Pitre
	7	* Created: Jun 15, 2001
	8	* Copyright: MontaVista Software Inc.
	9	*
	10	* This program is free software; you can redistribute it and/or modify
	11	* it under the terms of the GNU General Public License version 2 as
	12	* published by the Free Software Foundation.
	13	*/
	14
	15	#include <linux/init.h>
e3630db1	16	#include <linux/irq.h>
fced80c7	17	#include <linux/io.h>
0807da59 EM	18	#include <linux/sysdev.h>
0807da59 EM	19	#include <linux/bootmem.h>
1c44f5f1	20
da065a0b	21	#include <mach/gpio.h>
1c44f5f1	22
3b8e285c EM	23	int pxa_last_gpio;
3b8e285c EM	24
1c44f5f1 PZ	25	struct pxa_gpio_chip {
1c44f5f1 PZ	26	struct gpio_chip chip;
0807da59 EM	27	void __iomem *regbase;
	28	char label[10];
	29
	30	unsigned long irq_mask;
	31	unsigned long irq_edge_rise;
	32	unsigned long irq_edge_fall;
	33
	34	#ifdef CONFIG_PM
	35	unsigned long saved_gplr;
	36	unsigned long saved_gpdr;
	37	unsigned long saved_grer;
	38	unsigned long saved_gfer;
	39	#endif
1c44f5f1 PZ	40	};
1c44f5f1 PZ	41
0807da59 EM	42	static DEFINE_SPINLOCK(gpio_lock);
	43	static struct pxa_gpio_chip *pxa_gpio_chips;
	44
	45	#define for_each_gpio_chip(i, c) \
	46	for (i = 0, c = &pxa_gpio_chips[0]; i <= pxa_last_gpio; i += 32, c++)
	47
	48	static inline void __iomem gpio_chip_base(struct gpio_chip c)
	49	{
	50	return container_of(c, struct pxa_gpio_chip, chip)->regbase;
	51	}
	52
	53	static inline struct pxa_gpio_chip *gpio_to_chip(unsigned gpio)
	54	{
	55	return &pxa_gpio_chips[gpio_to_bank(gpio)];
	56	}
	57
1c44f5f1 PZ	58	static int pxa_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
1c44f5f1 PZ	59	{
0807da59 EM	60	void __iomem *base = gpio_chip_base(chip);
	61	uint32_t value, mask = 1 << offset;
	62	unsigned long flags;
	63
	64	spin_lock_irqsave(&gpio_lock, flags);
	65
	66	value = __raw_readl(base + GPDR_OFFSET);
067455aa EM	67	if (__gpio_is_inverted(chip->base + offset))
	68	value \|= mask;
	69	else
	70	value &= ~mask;
0807da59	71	__raw_writel(value, base + GPDR_OFFSET);
1c44f5f1	72
0807da59	73	spin_unlock_irqrestore(&gpio_lock, flags);
1c44f5f1 PZ	74	return 0;
	75	}
	76
	77	static int pxa_gpio_direction_output(struct gpio_chip *chip,
0807da59	78	unsigned offset, int value)
1c44f5f1	79	{
0807da59 EM	80	void __iomem *base = gpio_chip_base(chip);
	81	uint32_t tmp, mask = 1 << offset;
	82	unsigned long flags;
	83
	84	__raw_writel(mask, base + (value ? GPSR_OFFSET : GPCR_OFFSET));
	85
	86	spin_lock_irqsave(&gpio_lock, flags);
	87
	88	tmp = __raw_readl(base + GPDR_OFFSET);
067455aa EM	89	if (__gpio_is_inverted(chip->base + offset))
	90	tmp &= ~mask;
	91	else
	92	tmp \|= mask;
0807da59	93	__raw_writel(tmp, base + GPDR_OFFSET);
1c44f5f1	94
0807da59	95	spin_unlock_irqrestore(&gpio_lock, flags);
1c44f5f1 PZ	96	return 0;
	97	}
	98
1c44f5f1 PZ	99	static int pxa_gpio_get(struct gpio_chip *chip, unsigned offset)
1c44f5f1 PZ	100	{
0807da59	101	return __raw_readl(gpio_chip_base(chip) + GPLR_OFFSET) & (1 << offset);
1c44f5f1 PZ	102	}
1c44f5f1 PZ	103
1c44f5f1 PZ	104	static void pxa_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
1c44f5f1 PZ	105	{
0807da59 EM	106	__raw_writel(1 << offset, gpio_chip_base(chip) +
0807da59 EM	107	(value ? GPSR_OFFSET : GPCR_OFFSET));
1c44f5f1 PZ	108	}
1c44f5f1 PZ	109
0807da59	110	static int __init pxa_init_gpio_chip(int gpio_end)
a58fbcd8	111	{
0807da59 EM	112	int i, gpio, nbanks = gpio_to_bank(gpio_end) + 1;
0807da59 EM	113	struct pxa_gpio_chip *chips;
a58fbcd8	114
0807da59 EM	115	/* this is early, we have to use bootmem allocator, and we really
0807da59 EM	116	* want this to be allocated dynamically for different 'gpio_end'
a58fbcd8	117	*/
0807da59 EM	118	chips = alloc_bootmem_low(nbanks * sizeof(struct pxa_gpio_chip));
	119	if (chips == NULL) {
	120	pr_err("%s: failed to allocate GPIO chips\n", __func__);
	121	return -ENOMEM;
a58fbcd8	122	}
a58fbcd8	123
a8f6faeb EM	124	memset(chips, 0, nbanks * sizeof(struct pxa_gpio_chip));
a8f6faeb EM	125
0807da59 EM	126	for (i = 0, gpio = 0; i < nbanks; i++, gpio += 32) {
0807da59 EM	127	struct gpio_chip *c = &chips[i].chip;
e3630db1	128
0807da59 EM	129	sprintf(chips[i].label, "gpio-%d", i);
	130	chips[i].regbase = (void __iomem *)GPIO_BANK(i);
	131
	132	c->base = gpio;
	133	c->label = chips[i].label;
	134
	135	c->direction_input = pxa_gpio_direction_input;
	136	c->direction_output = pxa_gpio_direction_output;
	137	c->get = pxa_gpio_get;
	138	c->set = pxa_gpio_set;
	139
	140	/* number of GPIOs on last bank may be less than 32 */
	141	c->ngpio = (gpio + 31 > gpio_end) ? (gpio_end - gpio + 1) : 32;
	142	gpiochip_add(c);
	143	}
	144	pxa_gpio_chips = chips;
	145	return 0;
	146	}
e3630db1	147
a8f6faeb EM	148	/* Update only those GRERx and GFERx edge detection register bits if those
	149	* bits are set in c->irq_mask
	150	*/
	151	static inline void update_edge_detect(struct pxa_gpio_chip *c)
	152	{
	153	uint32_t grer, gfer;
	154
	155	grer = __raw_readl(c->regbase + GRER_OFFSET) & ~c->irq_mask;
	156	gfer = __raw_readl(c->regbase + GFER_OFFSET) & ~c->irq_mask;
	157	grer \|= c->irq_edge_rise & c->irq_mask;
	158	gfer \|= c->irq_edge_fall & c->irq_mask;
	159	__raw_writel(grer, c->regbase + GRER_OFFSET);
	160	__raw_writel(gfer, c->regbase + GFER_OFFSET);
	161	}
	162
e3630db1	163	static int pxa_gpio_irq_type(unsigned int irq, unsigned int type)
e3630db1	164	{
0807da59 EM	165	struct pxa_gpio_chip *c;
	166	int gpio = irq_to_gpio(irq);
	167	unsigned long gpdr, mask = GPIO_bit(gpio);
e3630db1	168
0807da59	169	c = gpio_to_chip(gpio);
e3630db1	170
	171	if (type == IRQ_TYPE_PROBE) {
	172	/* Don't mess with enabled GPIOs using preconfigured edges or
	173	* GPIOs set to alternate function or to output during probe
	174	*/
0807da59	175	if ((c->irq_edge_rise \| c->irq_edge_fall) & GPIO_bit(gpio))
e3630db1	176	return 0;
689c04a3	177
689c04a3	178	if (__gpio_is_occupied(gpio))
e3630db1	179	return 0;
689c04a3	180
e3630db1	181	type = IRQ_TYPE_EDGE_RISING \| IRQ_TYPE_EDGE_FALLING;
	182	}
	183
0807da59 EM	184	gpdr = __raw_readl(c->regbase + GPDR_OFFSET);
0807da59 EM	185
067455aa	186	if (__gpio_is_inverted(gpio))
0807da59	187	__raw_writel(gpdr \| mask, c->regbase + GPDR_OFFSET);
067455aa	188	else
0807da59	189	__raw_writel(gpdr & ~mask, c->regbase + GPDR_OFFSET);
e3630db1	190
e3630db1	191	if (type & IRQ_TYPE_EDGE_RISING)
0807da59	192	c->irq_edge_rise \|= mask;
e3630db1	193	else
0807da59	194	c->irq_edge_rise &= ~mask;
e3630db1	195
e3630db1	196	if (type & IRQ_TYPE_EDGE_FALLING)
0807da59	197	c->irq_edge_fall \|= mask;
e3630db1	198	else
0807da59	199	c->irq_edge_fall &= ~mask;
e3630db1	200
a8f6faeb	201	update_edge_detect(c);
e3630db1	202
	203	pr_debug("%s: IRQ%d (GPIO%d) - edge%s%s\n", __func__, irq, gpio,
	204	((type & IRQ_TYPE_EDGE_RISING) ? " rising" : ""),
	205	((type & IRQ_TYPE_EDGE_FALLING) ? " falling" : ""));
	206	return 0;
	207	}
	208
e3630db1	209	static void pxa_gpio_demux_handler(unsigned int irq, struct irq_desc *desc)
e3630db1	210	{
0807da59 EM	211	struct pxa_gpio_chip *c;
	212	int loop, gpio, gpio_base, n;
	213	unsigned long gedr;
e3630db1	214
e3630db1	215	do {
e3630db1	216	loop = 0;
0807da59 EM	217	for_each_gpio_chip(gpio, c) {
	218	gpio_base = c->chip.base;
	219
	220	gedr = __raw_readl(c->regbase + GEDR_OFFSET);
	221	gedr = gedr & c->irq_mask;
	222	__raw_writel(gedr, c->regbase + GEDR_OFFSET);
e3630db1	223
0807da59 EM	224	n = find_first_bit(&gedr, BITS_PER_LONG);
	225	while (n < BITS_PER_LONG) {
	226	loop = 1;
e3630db1	227
0807da59 EM	228	generic_handle_irq(gpio_to_irq(gpio_base + n));
	229	n = find_next_bit(&gedr, BITS_PER_LONG, n + 1);
	230	}
e3630db1	231	}
	232	} while (loop);
	233	}
	234
	235	static void pxa_ack_muxed_gpio(unsigned int irq)
	236	{
0807da59 EM	237	int gpio = irq_to_gpio(irq);
	238	struct pxa_gpio_chip *c = gpio_to_chip(gpio);
	239
	240	__raw_writel(GPIO_bit(gpio), c->regbase + GEDR_OFFSET);
e3630db1	241	}
	242
	243	static void pxa_mask_muxed_gpio(unsigned int irq)
	244	{
0807da59 EM	245	int gpio = irq_to_gpio(irq);
	246	struct pxa_gpio_chip *c = gpio_to_chip(gpio);
	247	uint32_t grer, gfer;
	248
	249	c->irq_mask &= ~GPIO_bit(gpio);
	250
	251	grer = __raw_readl(c->regbase + GRER_OFFSET) & ~GPIO_bit(gpio);
	252	gfer = __raw_readl(c->regbase + GFER_OFFSET) & ~GPIO_bit(gpio);
	253	__raw_writel(grer, c->regbase + GRER_OFFSET);
	254	__raw_writel(gfer, c->regbase + GFER_OFFSET);
e3630db1	255	}
	256
	257	static void pxa_unmask_muxed_gpio(unsigned int irq)
	258	{
0807da59 EM	259	int gpio = irq_to_gpio(irq);
	260	struct pxa_gpio_chip *c = gpio_to_chip(gpio);
	261
	262	c->irq_mask \|= GPIO_bit(gpio);
a8f6faeb	263	update_edge_detect(c);
e3630db1	264	}
	265
	266	static struct irq_chip pxa_muxed_gpio_chip = {
	267	.name = "GPIO",
	268	.ack = pxa_ack_muxed_gpio,
	269	.mask = pxa_mask_muxed_gpio,
	270	.unmask = pxa_unmask_muxed_gpio,
	271	.set_type = pxa_gpio_irq_type,
	272	};
	273
a58fbcd8	274	void __init pxa_init_gpio(int mux_irq, int start, int end, set_wake_t fn)
e3630db1	275	{
0807da59 EM	276	struct pxa_gpio_chip *c;
0807da59 EM	277	int gpio, irq;
e3630db1	278
a58fbcd8	279	pxa_last_gpio = end;
e3630db1	280
0807da59 EM	281	/* Initialize GPIO chips */
	282	pxa_init_gpio_chip(end);
	283
e3630db1	284	/* clear all GPIO edge detects */
0807da59 EM	285	for_each_gpio_chip(gpio, c) {
	286	__raw_writel(0, c->regbase + GFER_OFFSET);
	287	__raw_writel(0, c->regbase + GRER_OFFSET);
	288	__raw_writel(~0,c->regbase + GEDR_OFFSET);
e3630db1	289	}
e3630db1	290
a58fbcd8	291	for (irq = gpio_to_irq(start); irq <= gpio_to_irq(end); irq++) {
e3630db1	292	set_irq_chip(irq, &pxa_muxed_gpio_chip);
	293	set_irq_handler(irq, handle_edge_irq);
	294	set_irq_flags(irq, IRQF_VALID \| IRQF_PROBE);
	295	}
	296
	297	/* Install handler for GPIO>=2 edge detect interrupts */
a58fbcd8	298	set_irq_chained_handler(mux_irq, pxa_gpio_demux_handler);
b9e25ace	299	pxa_muxed_gpio_chip.set_wake = fn;
e3630db1	300	}
663707c1	301
663707c1	302	#ifdef CONFIG_PM
663707c1	303	static int pxa_gpio_suspend(struct sys_device *dev, pm_message_t state)
663707c1	304	{
0807da59 EM	305	struct pxa_gpio_chip *c;
0807da59 EM	306	int gpio;
663707c1	307
0807da59 EM	308	for_each_gpio_chip(gpio, c) {
	309	c->saved_gplr = __raw_readl(c->regbase + GPLR_OFFSET);
	310	c->saved_gpdr = __raw_readl(c->regbase + GPDR_OFFSET);
	311	c->saved_grer = __raw_readl(c->regbase + GRER_OFFSET);
	312	c->saved_gfer = __raw_readl(c->regbase + GFER_OFFSET);
663707c1	313
663707c1	314	/* Clear GPIO transition detect bits */
0807da59	315	__raw_writel(0xffffffff, c->regbase + GEDR_OFFSET);
663707c1	316	}
	317	return 0;
	318	}
	319
	320	static int pxa_gpio_resume(struct sys_device *dev)
	321	{
0807da59 EM	322	struct pxa_gpio_chip *c;
0807da59 EM	323	int gpio;
663707c1	324
0807da59	325	for_each_gpio_chip(gpio, c) {
663707c1	326	/* restore level with set/clear */
0807da59 EM	327	__raw_writel( c->saved_gplr, c->regbase + GPSR_OFFSET);
0807da59 EM	328	__raw_writel(~c->saved_gplr, c->regbase + GPCR_OFFSET);
663707c1	329
0807da59 EM	330	__raw_writel(c->saved_grer, c->regbase + GRER_OFFSET);
	331	__raw_writel(c->saved_gfer, c->regbase + GFER_OFFSET);
	332	__raw_writel(c->saved_gpdr, c->regbase + GPDR_OFFSET);
663707c1	333	}
	334	return 0;
	335	}
	336	#else
	337	#define pxa_gpio_suspend NULL
	338	#define pxa_gpio_resume NULL
	339	#endif
	340
	341	struct sysdev_class pxa_gpio_sysclass = {
	342	.name = "gpio",
	343	.suspend = pxa_gpio_suspend,
	344	.resume = pxa_gpio_resume,
	345	};
	346
	347	static int __init pxa_gpio_init(void)
	348	{
	349	return sysdev_class_register(&pxa_gpio_sysclass);
	350	}
	351
	352	core_initcall(pxa_gpio_init);