[deliverable/linux.git] / drivers / gpio / gpio-pxa.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/gpio.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/syscore_ops.h>
#include <linux/slab.h>

#include <mach/gpio-pxa.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
};

enum {
	PXA25X_GPIO = 0,
	PXA26X_GPIO,
	PXA27X_GPIO,
	PXA3XX_GPIO,
	PXA93X_GPIO,
	MMP_GPIO = 0x10,
	MMP2_GPIO,
};

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

#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_pxachip(unsigned gpio)
{
	return &pxa_gpio_chips[gpio_to_bank(gpio)];
}

static inline int gpio_is_pxa_type(int type)
{
	return (type & MMP_GPIO) == 0;
}

static inline int gpio_is_mmp_type(int type)
{
	return (type & MMP_GPIO) != 0;
}

#ifdef CONFIG_ARCH_PXA
static inline int __pxa_gpio_to_irq(int gpio)
{
	if (gpio_is_pxa_type(gpio_type))
		return PXA_GPIO_TO_IRQ(gpio);
	return -1;
}

static inline int __pxa_irq_to_gpio(int irq)
{
	if (gpio_is_pxa_type(gpio_type))
		return irq - PXA_GPIO_TO_IRQ(0);
	return -1;
}
#else
static inline int __pxa_gpio_to_irq(int gpio) { return -1; }
static inline int __pxa_irq_to_gpio(int irq) { return -1; }
#endif

#ifdef CONFIG_ARCH_MMP
static inline int __mmp_gpio_to_irq(int gpio)
{
	if (gpio_is_mmp_type(gpio_type))
		return MMP_GPIO_TO_IRQ(gpio);
	return -1;
}

static inline int __mmp_irq_to_gpio(int irq)
{
	if (gpio_is_mmp_type(gpio_type))
		return irq - MMP_GPIO_TO_IRQ(0);
	return -1;
}
#else
static inline int __mmp_gpio_to_irq(int gpio) { return -1; }
static inline int __mmp_irq_to_gpio(int irq) { return -1; }
#endif

static int pxa_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
{
	int gpio, ret;

	gpio = chip->base + offset;
	ret = __pxa_gpio_to_irq(gpio);
	if (ret >= 0)
		return ret;
	return __mmp_gpio_to_irq(gpio);
}

int pxa_irq_to_gpio(int irq)
{
	int ret;

	ret = __pxa_irq_to_gpio(irq);
	if (ret >= 0)
		return ret;
	return __mmp_irq_to_gpio(irq);
}

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 = readl_relaxed(base + GPDR_OFFSET);
	if (__gpio_is_inverted(chip->base + offset))
		value |= mask;
	else
		value &= ~mask;
	writel_relaxed(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;

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

	spin_lock_irqsave(&gpio_lock, flags);

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

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

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

static void pxa_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
	writel_relaxed(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;

	chips = kzalloc(nbanks * sizeof(struct pxa_gpio_chip), GFP_KERNEL);
	if (chips == NULL) {
		pr_err("%s: failed to allocate GPIO chips\n", __func__);
		return -ENOMEM;
	}

	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 = 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;
		c->to_irq = pxa_gpio_to_irq;

		/* 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 = readl_relaxed(c->regbase + GRER_OFFSET) & ~c->irq_mask;
	gfer = readl_relaxed(c->regbase + GFER_OFFSET) & ~c->irq_mask;
	grer |= c->irq_edge_rise & c->irq_mask;
	gfer |= c->irq_edge_fall & c->irq_mask;
	writel_relaxed(grer, c->regbase + GRER_OFFSET);
	writel_relaxed(gfer, c->regbase + GFER_OFFSET);
}

static int pxa_gpio_irq_type(struct irq_data *d, unsigned int type)
{
	struct pxa_gpio_chip *c;
	int gpio = pxa_irq_to_gpio(d->irq);
	unsigned long gpdr, mask = GPIO_bit(gpio);

	c = gpio_to_pxachip(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 = readl_relaxed(c->regbase + GPDR_OFFSET);

	if (__gpio_is_inverted(gpio))
		writel_relaxed(gpdr | mask,  c->regbase + GPDR_OFFSET);
	else
		writel_relaxed(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__, d->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 = readl_relaxed(c->regbase + GEDR_OFFSET);
			gedr = gedr & c->irq_mask;
			writel_relaxed(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(struct irq_data *d)
{
	int gpio = pxa_irq_to_gpio(d->irq);
	struct pxa_gpio_chip *c = gpio_to_pxachip(gpio);

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

static void pxa_mask_muxed_gpio(struct irq_data *d)
{
	int gpio = pxa_irq_to_gpio(d->irq);
	struct pxa_gpio_chip *c = gpio_to_pxachip(gpio);
	uint32_t grer, gfer;

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

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

static void pxa_unmask_muxed_gpio(struct irq_data *d)
{
	int gpio = pxa_irq_to_gpio(d->irq);
	struct pxa_gpio_chip *c = gpio_to_pxachip(gpio);

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

static struct irq_chip pxa_muxed_gpio_chip = {
	.name		= "GPIO",
	.irq_ack	= pxa_ack_muxed_gpio,
	.irq_mask	= pxa_mask_muxed_gpio,
	.irq_unmask	= pxa_unmask_muxed_gpio,
	.irq_set_type	= pxa_gpio_irq_type,
};

static int pxa_gpio_nums(void)
{
	int count = 0;

#ifdef CONFIG_ARCH_PXA
	if (cpu_is_pxa25x()) {
#ifdef CONFIG_CPU_PXA26x
		count = 89;
		gpio_type = PXA26X_GPIO;
#elif defined(CONFIG_PXA25x)
		count = 84;
		gpio_type = PXA26X_GPIO;
#endif /* CONFIG_CPU_PXA26x */
	} else if (cpu_is_pxa27x()) {
		count = 120;
		gpio_type = PXA27X_GPIO;
	} else if (cpu_is_pxa93x() || cpu_is_pxa95x()) {
		count = 191;
		gpio_type = PXA93X_GPIO;
	} else if (cpu_is_pxa3xx()) {
		count = 127;
		gpio_type = PXA3XX_GPIO;
	}
#endif /* CONFIG_ARCH_PXA */

#ifdef CONFIG_ARCH_MMP
	if (cpu_is_pxa168() || cpu_is_pxa910()) {
		count = 127;
		gpio_type = MMP_GPIO;
	} else if (cpu_is_mmp2()) {
		count = 191;
		gpio_type = MMP2_GPIO;
	}
#endif /* CONFIG_ARCH_MMP */
	return count;
}

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 = pxa_gpio_nums();
	if (!pxa_last_gpio)
		return;

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

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

#ifdef CONFIG_ARCH_PXA
	irq = gpio_to_irq(0);
	irq_set_chip_and_handler(irq, &pxa_muxed_gpio_chip,
				 handle_edge_irq);
	set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
	irq_set_chained_handler(IRQ_GPIO0, pxa_gpio_demux_handler);

	irq = gpio_to_irq(1);
	irq_set_chip_and_handler(irq, &pxa_muxed_gpio_chip,
				 handle_edge_irq);
	set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
	irq_set_chained_handler(IRQ_GPIO1, pxa_gpio_demux_handler);
#endif

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

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

#ifdef CONFIG_PM
static int pxa_gpio_suspend(void)
{
	struct pxa_gpio_chip *c;
	int gpio;

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

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

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

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

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

struct syscore_ops pxa_gpio_syscore_ops = {
	.suspend	= pxa_gpio_suspend,
	.resume		= pxa_gpio_resume,
};
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	*/
2f8163ba	14	#include <linux/gpio.h>
1c44f5f1	15	#include <linux/init.h>
e3630db1	16	#include <linux/irq.h>
fced80c7	17	#include <linux/io.h>
2eaa03b5	18	#include <linux/syscore_ops.h>
4aa78264	19	#include <linux/slab.h>
1c44f5f1	20
f55be1bf	21	#include <mach/gpio-pxa.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
4929f5a8 HZ	42	enum {
	43	PXA25X_GPIO = 0,
	44	PXA26X_GPIO,
	45	PXA27X_GPIO,
	46	PXA3XX_GPIO,
	47	PXA93X_GPIO,
	48	MMP_GPIO = 0x10,
	49	MMP2_GPIO,
	50	};
	51
0807da59 EM	52	static DEFINE_SPINLOCK(gpio_lock);
0807da59 EM	53	static struct pxa_gpio_chip *pxa_gpio_chips;
4929f5a8	54	static int gpio_type;
0807da59 EM	55
	56	#define for_each_gpio_chip(i, c) \
	57	for (i = 0, c = &pxa_gpio_chips[0]; i <= pxa_last_gpio; i += 32, c++)
	58
	59	static inline void __iomem gpio_chip_base(struct gpio_chip c)
	60	{
	61	return container_of(c, struct pxa_gpio_chip, chip)->regbase;
	62	}
	63
a065685d	64	static inline struct pxa_gpio_chip *gpio_to_pxachip(unsigned gpio)
0807da59 EM	65	{
	66	return &pxa_gpio_chips[gpio_to_bank(gpio)];
	67	}
	68
4929f5a8 HZ	69	static inline int gpio_is_pxa_type(int type)
	70	{
	71	return (type & MMP_GPIO) == 0;
	72	}
	73
	74	static inline int gpio_is_mmp_type(int type)
	75	{
	76	return (type & MMP_GPIO) != 0;
	77	}
	78
	79	#ifdef CONFIG_ARCH_PXA
	80	static inline int __pxa_gpio_to_irq(int gpio)
	81	{
	82	if (gpio_is_pxa_type(gpio_type))
	83	return PXA_GPIO_TO_IRQ(gpio);
	84	return -1;
	85	}
	86
	87	static inline int __pxa_irq_to_gpio(int irq)
	88	{
	89	if (gpio_is_pxa_type(gpio_type))
	90	return irq - PXA_GPIO_TO_IRQ(0);
	91	return -1;
	92	}
	93	#else
	94	static inline int __pxa_gpio_to_irq(int gpio) { return -1; }
	95	static inline int __pxa_irq_to_gpio(int irq) { return -1; }
	96	#endif
	97
	98	#ifdef CONFIG_ARCH_MMP
	99	static inline int __mmp_gpio_to_irq(int gpio)
	100	{
	101	if (gpio_is_mmp_type(gpio_type))
	102	return MMP_GPIO_TO_IRQ(gpio);
	103	return -1;
	104	}
	105
	106	static inline int __mmp_irq_to_gpio(int irq)
	107	{
	108	if (gpio_is_mmp_type(gpio_type))
	109	return irq - MMP_GPIO_TO_IRQ(0);
	110	return -1;
	111	}
	112	#else
	113	static inline int __mmp_gpio_to_irq(int gpio) { return -1; }
	114	static inline int __mmp_irq_to_gpio(int irq) { return -1; }
	115	#endif
	116
	117	static int pxa_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
	118	{
	119	int gpio, ret;
	120
	121	gpio = chip->base + offset;
	122	ret = __pxa_gpio_to_irq(gpio);
	123	if (ret >= 0)
	124	return ret;
	125	return __mmp_gpio_to_irq(gpio);
	126	}
	127
	128	int pxa_irq_to_gpio(int irq)
	129	{
	130	int ret;
	131
	132	ret = __pxa_irq_to_gpio(irq);
133	if (ret >= 0)
134	return ret;
135	return __mmp_irq_to_gpio(irq);
136	}
137
1c44f5f1 PZ	138	static int pxa_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
1c44f5f1 PZ	139	{
0807da59 EM	140	void __iomem *base = gpio_chip_base(chip);
	141	uint32_t value, mask = 1 << offset;
	142	unsigned long flags;
	143
	144	spin_lock_irqsave(&gpio_lock, flags);
	145
df664d20	146	value = readl_relaxed(base + GPDR_OFFSET);
067455aa EM	147	if (__gpio_is_inverted(chip->base + offset))
	148	value \|= mask;
	149	else
	150	value &= ~mask;
df664d20	151	writel_relaxed(value, base + GPDR_OFFSET);
1c44f5f1	152
0807da59	153	spin_unlock_irqrestore(&gpio_lock, flags);
1c44f5f1 PZ	154	return 0;
	155	}
	156
	157	static int pxa_gpio_direction_output(struct gpio_chip *chip,
0807da59	158	unsigned offset, int value)
1c44f5f1	159	{
0807da59 EM	160	void __iomem *base = gpio_chip_base(chip);
	161	uint32_t tmp, mask = 1 << offset;
	162	unsigned long flags;
	163
df664d20	164	writel_relaxed(mask, base + (value ? GPSR_OFFSET : GPCR_OFFSET));
0807da59 EM	165
	166	spin_lock_irqsave(&gpio_lock, flags);
	167
df664d20	168	tmp = readl_relaxed(base + GPDR_OFFSET);
067455aa EM	169	if (__gpio_is_inverted(chip->base + offset))
	170	tmp &= ~mask;
	171	else
	172	tmp \|= mask;
df664d20	173	writel_relaxed(tmp, base + GPDR_OFFSET);
1c44f5f1	174
0807da59	175	spin_unlock_irqrestore(&gpio_lock, flags);
1c44f5f1 PZ	176	return 0;
	177	}
	178
1c44f5f1 PZ	179	static int pxa_gpio_get(struct gpio_chip *chip, unsigned offset)
1c44f5f1 PZ	180	{
df664d20	181	return readl_relaxed(gpio_chip_base(chip) + GPLR_OFFSET) & (1 << offset);
1c44f5f1 PZ	182	}
1c44f5f1 PZ	183
1c44f5f1 PZ	184	static void pxa_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
1c44f5f1 PZ	185	{
df664d20	186	writel_relaxed(1 << offset, gpio_chip_base(chip) +
0807da59	187	(value ? GPSR_OFFSET : GPCR_OFFSET));
1c44f5f1 PZ	188	}
1c44f5f1 PZ	189
0807da59	190	static int __init pxa_init_gpio_chip(int gpio_end)
a58fbcd8	191	{
0807da59 EM	192	int i, gpio, nbanks = gpio_to_bank(gpio_end) + 1;
0807da59 EM	193	struct pxa_gpio_chip *chips;
a58fbcd8	194
4aa78264	195	chips = kzalloc(nbanks * sizeof(struct pxa_gpio_chip), GFP_KERNEL);
0807da59 EM	196	if (chips == NULL) {
	197	pr_err("%s: failed to allocate GPIO chips\n", __func__);
	198	return -ENOMEM;
a58fbcd8	199	}
a58fbcd8	200
0807da59 EM	201	for (i = 0, gpio = 0; i < nbanks; i++, gpio += 32) {
0807da59 EM	202	struct gpio_chip *c = &chips[i].chip;
e3630db1	203
0807da59	204	sprintf(chips[i].label, "gpio-%d", i);
97b09da4	205	chips[i].regbase = GPIO_BANK(i);
0807da59 EM	206
	207	c->base = gpio;
	208	c->label = chips[i].label;
	209
	210	c->direction_input = pxa_gpio_direction_input;
	211	c->direction_output = pxa_gpio_direction_output;
	212	c->get = pxa_gpio_get;
	213	c->set = pxa_gpio_set;
4929f5a8	214	c->to_irq = pxa_gpio_to_irq;
0807da59 EM	215
	216	/* number of GPIOs on last bank may be less than 32 */
	217	c->ngpio = (gpio + 31 > gpio_end) ? (gpio_end - gpio + 1) : 32;
	218	gpiochip_add(c);
	219	}
	220	pxa_gpio_chips = chips;
	221	return 0;
	222	}
e3630db1	223
a8f6faeb EM	224	/* Update only those GRERx and GFERx edge detection register bits if those
	225	* bits are set in c->irq_mask
	226	*/
	227	static inline void update_edge_detect(struct pxa_gpio_chip *c)
	228	{
	229	uint32_t grer, gfer;
	230
df664d20 HZ	231	grer = readl_relaxed(c->regbase + GRER_OFFSET) & ~c->irq_mask;
df664d20 HZ	232	gfer = readl_relaxed(c->regbase + GFER_OFFSET) & ~c->irq_mask;
a8f6faeb EM	233	grer \|= c->irq_edge_rise & c->irq_mask;
a8f6faeb EM	234	gfer \|= c->irq_edge_fall & c->irq_mask;
df664d20 HZ	235	writel_relaxed(grer, c->regbase + GRER_OFFSET);
df664d20 HZ	236	writel_relaxed(gfer, c->regbase + GFER_OFFSET);
a8f6faeb EM	237	}
a8f6faeb EM	238
a3f4c927	239	static int pxa_gpio_irq_type(struct irq_data *d, unsigned int type)
e3630db1	240	{
0807da59	241	struct pxa_gpio_chip *c;
4929f5a8	242	int gpio = pxa_irq_to_gpio(d->irq);
0807da59	243	unsigned long gpdr, mask = GPIO_bit(gpio);
e3630db1	244
a065685d	245	c = gpio_to_pxachip(gpio);
e3630db1	246
	247	if (type == IRQ_TYPE_PROBE) {
	248	/* Don't mess with enabled GPIOs using preconfigured edges or
	249	* GPIOs set to alternate function or to output during probe
	250	*/
0807da59	251	if ((c->irq_edge_rise \| c->irq_edge_fall) & GPIO_bit(gpio))
e3630db1	252	return 0;
689c04a3	253
689c04a3	254	if (__gpio_is_occupied(gpio))
e3630db1	255	return 0;
689c04a3	256
e3630db1	257	type = IRQ_TYPE_EDGE_RISING \| IRQ_TYPE_EDGE_FALLING;
	258	}
	259
df664d20	260	gpdr = readl_relaxed(c->regbase + GPDR_OFFSET);
0807da59	261
067455aa	262	if (__gpio_is_inverted(gpio))
df664d20	263	writel_relaxed(gpdr \| mask, c->regbase + GPDR_OFFSET);
067455aa	264	else
df664d20	265	writel_relaxed(gpdr & ~mask, c->regbase + GPDR_OFFSET);
e3630db1	266
e3630db1	267	if (type & IRQ_TYPE_EDGE_RISING)
0807da59	268	c->irq_edge_rise \|= mask;
e3630db1	269	else
0807da59	270	c->irq_edge_rise &= ~mask;
e3630db1	271
e3630db1	272	if (type & IRQ_TYPE_EDGE_FALLING)
0807da59	273	c->irq_edge_fall \|= mask;
e3630db1	274	else
0807da59	275	c->irq_edge_fall &= ~mask;
e3630db1	276
a8f6faeb	277	update_edge_detect(c);
e3630db1	278
a3f4c927	279	pr_debug("%s: IRQ%d (GPIO%d) - edge%s%s\n", __func__, d->irq, gpio,
e3630db1	280	((type & IRQ_TYPE_EDGE_RISING) ? " rising" : ""),
	281	((type & IRQ_TYPE_EDGE_FALLING) ? " falling" : ""));
	282	return 0;
	283	}
	284
e3630db1	285	static void pxa_gpio_demux_handler(unsigned int irq, struct irq_desc *desc)
e3630db1	286	{
0807da59 EM	287	struct pxa_gpio_chip *c;
	288	int loop, gpio, gpio_base, n;
	289	unsigned long gedr;
e3630db1	290
e3630db1	291	do {
e3630db1	292	loop = 0;
0807da59 EM	293	for_each_gpio_chip(gpio, c) {
	294	gpio_base = c->chip.base;
	295
df664d20	296	gedr = readl_relaxed(c->regbase + GEDR_OFFSET);
0807da59	297	gedr = gedr & c->irq_mask;
df664d20	298	writel_relaxed(gedr, c->regbase + GEDR_OFFSET);
e3630db1	299
0807da59 EM	300	n = find_first_bit(&gedr, BITS_PER_LONG);
	301	while (n < BITS_PER_LONG) {
	302	loop = 1;
e3630db1	303
0807da59 EM	304	generic_handle_irq(gpio_to_irq(gpio_base + n));
	305	n = find_next_bit(&gedr, BITS_PER_LONG, n + 1);
	306	}
e3630db1	307	}
	308	} while (loop);
	309	}
	310
a3f4c927	311	static void pxa_ack_muxed_gpio(struct irq_data *d)
e3630db1	312	{
4929f5a8	313	int gpio = pxa_irq_to_gpio(d->irq);
a065685d	314	struct pxa_gpio_chip *c = gpio_to_pxachip(gpio);
0807da59	315
df664d20	316	writel_relaxed(GPIO_bit(gpio), c->regbase + GEDR_OFFSET);
e3630db1	317	}
e3630db1	318
a3f4c927	319	static void pxa_mask_muxed_gpio(struct irq_data *d)
e3630db1	320	{
4929f5a8	321	int gpio = pxa_irq_to_gpio(d->irq);
a065685d	322	struct pxa_gpio_chip *c = gpio_to_pxachip(gpio);
0807da59 EM	323	uint32_t grer, gfer;
	324
	325	c->irq_mask &= ~GPIO_bit(gpio);
	326
df664d20 HZ	327	grer = readl_relaxed(c->regbase + GRER_OFFSET) & ~GPIO_bit(gpio);
	328	gfer = readl_relaxed(c->regbase + GFER_OFFSET) & ~GPIO_bit(gpio);
	329	writel_relaxed(grer, c->regbase + GRER_OFFSET);
	330	writel_relaxed(gfer, c->regbase + GFER_OFFSET);
e3630db1	331	}
e3630db1	332
a3f4c927	333	static void pxa_unmask_muxed_gpio(struct irq_data *d)
e3630db1	334	{
4929f5a8	335	int gpio = pxa_irq_to_gpio(d->irq);
a065685d	336	struct pxa_gpio_chip *c = gpio_to_pxachip(gpio);
0807da59 EM	337
0807da59 EM	338	c->irq_mask \|= GPIO_bit(gpio);
a8f6faeb	339	update_edge_detect(c);
e3630db1	340	}
	341
	342	static struct irq_chip pxa_muxed_gpio_chip = {
	343	.name = "GPIO",
a3f4c927 LB	344	.irq_ack = pxa_ack_muxed_gpio,
	345	.irq_mask = pxa_mask_muxed_gpio,
	346	.irq_unmask = pxa_unmask_muxed_gpio,
	347	.irq_set_type = pxa_gpio_irq_type,
e3630db1	348	};
e3630db1	349
478e223c HZ	350	static int pxa_gpio_nums(void)
	351	{
	352	int count = 0;
	353
	354	#ifdef CONFIG_ARCH_PXA
	355	if (cpu_is_pxa25x()) {
	356	#ifdef CONFIG_CPU_PXA26x
	357	count = 89;
	358	gpio_type = PXA26X_GPIO;
	359	#elif defined(CONFIG_PXA25x)
	360	count = 84;
	361	gpio_type = PXA26X_GPIO;
	362	#endif /* CONFIG_CPU_PXA26x */
	363	} else if (cpu_is_pxa27x()) {
	364	count = 120;
	365	gpio_type = PXA27X_GPIO;
	366	} else if (cpu_is_pxa93x() \|\| cpu_is_pxa95x()) {
	367	count = 191;
	368	gpio_type = PXA93X_GPIO;
	369	} else if (cpu_is_pxa3xx()) {
	370	count = 127;
	371	gpio_type = PXA3XX_GPIO;
	372	}
	373	#endif /* CONFIG_ARCH_PXA */
	374
	375	#ifdef CONFIG_ARCH_MMP
	376	if (cpu_is_pxa168() \|\| cpu_is_pxa910()) {
	377	count = 127;
	378	gpio_type = MMP_GPIO;
	379	} else if (cpu_is_mmp2()) {
	380	count = 191;
	381	gpio_type = MMP2_GPIO;
	382	}
	383	#endif /* CONFIG_ARCH_MMP */
	384	return count;
	385	}
	386
a58fbcd8	387	void __init pxa_init_gpio(int mux_irq, int start, int end, set_wake_t fn)
e3630db1	388	{
0807da59 EM	389	struct pxa_gpio_chip *c;
0807da59 EM	390	int gpio, irq;
e3630db1	391
478e223c HZ	392	pxa_last_gpio = pxa_gpio_nums();
	393	if (!pxa_last_gpio)
	394	return;
e3630db1	395
0807da59 EM	396	/* Initialize GPIO chips */
	397	pxa_init_gpio_chip(end);
	398
e3630db1	399	/* clear all GPIO edge detects */
0807da59	400	for_each_gpio_chip(gpio, c) {
df664d20 HZ	401	writel_relaxed(0, c->regbase + GFER_OFFSET);
	402	writel_relaxed(0, c->regbase + GRER_OFFSET);
	403	writel_relaxed(~0,c->regbase + GEDR_OFFSET);
e3630db1	404	}
e3630db1	405
87c49e20 HZ	406	#ifdef CONFIG_ARCH_PXA
	407	irq = gpio_to_irq(0);
	408	irq_set_chip_and_handler(irq, &pxa_muxed_gpio_chip,
	409	handle_edge_irq);
	410	set_irq_flags(irq, IRQF_VALID \| IRQF_PROBE);
	411	irq_set_chained_handler(IRQ_GPIO0, pxa_gpio_demux_handler);
	412
	413	irq = gpio_to_irq(1);
	414	irq_set_chip_and_handler(irq, &pxa_muxed_gpio_chip,
	415	handle_edge_irq);
	416	set_irq_flags(irq, IRQF_VALID \| IRQF_PROBE);
	417	irq_set_chained_handler(IRQ_GPIO1, pxa_gpio_demux_handler);
	418	#endif
	419
a58fbcd8	420	for (irq = gpio_to_irq(start); irq <= gpio_to_irq(end); irq++) {
f38c02f3 TG	421	irq_set_chip_and_handler(irq, &pxa_muxed_gpio_chip,
f38c02f3 TG	422	handle_edge_irq);
e3630db1	423	set_irq_flags(irq, IRQF_VALID \| IRQF_PROBE);
	424	}
	425
	426	/* Install handler for GPIO>=2 edge detect interrupts */
6845664a	427	irq_set_chained_handler(mux_irq, pxa_gpio_demux_handler);
a3f4c927	428	pxa_muxed_gpio_chip.irq_set_wake = fn;
e3630db1	429	}
663707c1	430
663707c1	431	#ifdef CONFIG_PM
2eaa03b5	432	static int pxa_gpio_suspend(void)
663707c1	433	{
0807da59 EM	434	struct pxa_gpio_chip *c;
0807da59 EM	435	int gpio;
663707c1	436
0807da59	437	for_each_gpio_chip(gpio, c) {
df664d20 HZ	438	c->saved_gplr = readl_relaxed(c->regbase + GPLR_OFFSET);
	439	c->saved_gpdr = readl_relaxed(c->regbase + GPDR_OFFSET);
	440	c->saved_grer = readl_relaxed(c->regbase + GRER_OFFSET);
	441	c->saved_gfer = readl_relaxed(c->regbase + GFER_OFFSET);
663707c1	442
663707c1	443	/* Clear GPIO transition detect bits */
df664d20	444	writel_relaxed(0xffffffff, c->regbase + GEDR_OFFSET);
663707c1	445	}
	446	return 0;
	447	}
	448
2eaa03b5	449	static void pxa_gpio_resume(void)
663707c1	450	{
0807da59 EM	451	struct pxa_gpio_chip *c;
0807da59 EM	452	int gpio;
663707c1	453
0807da59	454	for_each_gpio_chip(gpio, c) {
663707c1	455	/* restore level with set/clear */
df664d20 HZ	456	writel_relaxed( c->saved_gplr, c->regbase + GPSR_OFFSET);
df664d20 HZ	457	writel_relaxed(~c->saved_gplr, c->regbase + GPCR_OFFSET);
663707c1	458
df664d20 HZ	459	writel_relaxed(c->saved_grer, c->regbase + GRER_OFFSET);
	460	writel_relaxed(c->saved_gfer, c->regbase + GFER_OFFSET);
	461	writel_relaxed(c->saved_gpdr, c->regbase + GPDR_OFFSET);
663707c1	462	}
663707c1	463	}
	464	#else
	465	#define pxa_gpio_suspend NULL
	466	#define pxa_gpio_resume NULL
	467	#endif
	468
2eaa03b5	469	struct syscore_ops pxa_gpio_syscore_ops = {
663707c1	470	.suspend = pxa_gpio_suspend,
	471	.resume = pxa_gpio_resume,
	472	};