[linux.git] / drivers / gpio / gpio-sa1100.c

/*
 * linux/arch/arm/mach-sa1100/gpio.c
 *
 * Generic SA-1100 GPIO handling
 *
 * 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/module.h>
#include <linux/io.h>
#include <linux/syscore_ops.h>
#include <mach/hardware.h>
#include <mach/irqs.h>

static int sa1100_gpio_get(struct gpio_chip *chip, unsigned offset)
{
	return !!(GPLR & GPIO_GPIO(offset));
}

static void sa1100_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
	if (value)
		GPSR = GPIO_GPIO(offset);
	else
		GPCR = GPIO_GPIO(offset);
}

static int sa1100_direction_input(struct gpio_chip *chip, unsigned offset)
{
	unsigned long flags;

	local_irq_save(flags);
	GPDR &= ~GPIO_GPIO(offset);
	local_irq_restore(flags);
	return 0;
}

static int sa1100_direction_output(struct gpio_chip *chip, unsigned offset, int value)
{
	unsigned long flags;

	local_irq_save(flags);
	sa1100_gpio_set(chip, offset, value);
	GPDR |= GPIO_GPIO(offset);
	local_irq_restore(flags);
	return 0;
}

static int sa1100_to_irq(struct gpio_chip *chip, unsigned offset)
{
	return IRQ_GPIO0 + offset;
}

static struct gpio_chip sa1100_gpio_chip = {
	.label			= "gpio",
	.direction_input	= sa1100_direction_input,
	.direction_output	= sa1100_direction_output,
	.set			= sa1100_gpio_set,
	.get			= sa1100_gpio_get,
	.to_irq			= sa1100_to_irq,
	.base			= 0,
	.ngpio			= GPIO_MAX + 1,
};

/*
 * SA1100 GPIO edge detection for IRQs:
 * IRQs are generated on Falling-Edge, Rising-Edge, or both.
 * Use this instead of directly setting GRER/GFER.
 */
static int GPIO_IRQ_rising_edge;
static int GPIO_IRQ_falling_edge;
static int GPIO_IRQ_mask;

static int sa1100_gpio_type(struct irq_data *d, unsigned int type)
{
	unsigned int mask;

	mask = BIT(d->hwirq);

	if (type == IRQ_TYPE_PROBE) {
		if ((GPIO_IRQ_rising_edge | GPIO_IRQ_falling_edge) & mask)
			return 0;
		type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
	}

	if (type & IRQ_TYPE_EDGE_RISING)
		GPIO_IRQ_rising_edge |= mask;
	else
		GPIO_IRQ_rising_edge &= ~mask;
	if (type & IRQ_TYPE_EDGE_FALLING)
		GPIO_IRQ_falling_edge |= mask;
	else
		GPIO_IRQ_falling_edge &= ~mask;

	GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask;
	GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask;

	return 0;
}

/*
 * GPIO IRQs must be acknowledged.
 */
static void sa1100_gpio_ack(struct irq_data *d)
{
	GEDR = BIT(d->hwirq);
}

static void sa1100_gpio_mask(struct irq_data *d)
{
	unsigned int mask = BIT(d->hwirq);

	GPIO_IRQ_mask &= ~mask;

	GRER &= ~mask;
	GFER &= ~mask;
}

static void sa1100_gpio_unmask(struct irq_data *d)
{
	unsigned int mask = BIT(d->hwirq);

	GPIO_IRQ_mask |= mask;

	GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask;
	GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask;
}

static int sa1100_gpio_wake(struct irq_data *d, unsigned int on)
{
	if (on)
		PWER |= BIT(d->hwirq);
	else
		PWER &= ~BIT(d->hwirq);
	return 0;
}

/*
 * This is for GPIO IRQs
 */
static struct irq_chip sa1100_gpio_irq_chip = {
	.name		= "GPIO",
	.irq_ack	= sa1100_gpio_ack,
	.irq_mask	= sa1100_gpio_mask,
	.irq_unmask	= sa1100_gpio_unmask,
	.irq_set_type	= sa1100_gpio_type,
	.irq_set_wake	= sa1100_gpio_wake,
};

static int sa1100_gpio_irqdomain_map(struct irq_domain *d,
		unsigned int irq, irq_hw_number_t hwirq)
{
	irq_set_chip_and_handler(irq, &sa1100_gpio_irq_chip,
				 handle_edge_irq);
	irq_set_noprobe(irq);

	return 0;
}

static const struct irq_domain_ops sa1100_gpio_irqdomain_ops = {
	.map = sa1100_gpio_irqdomain_map,
	.xlate = irq_domain_xlate_onetwocell,
};

static struct irq_domain *sa1100_gpio_irqdomain;

/*
 * IRQ 0-11 (GPIO) handler.  We enter here with the
 * irq_controller_lock held, and IRQs disabled.  Decode the IRQ
 * and call the handler.
 */
static void sa1100_gpio_handler(struct irq_desc *desc)
{
	unsigned int irq, mask;

	mask = GEDR;
	do {
		/*
		 * clear down all currently active IRQ sources.
		 * We will be processing them all.
		 */
		GEDR = mask;

		irq = IRQ_GPIO0;
		do {
			if (mask & 1)
				generic_handle_irq(irq);
			mask >>= 1;
			irq++;
		} while (mask);

		mask = GEDR;
	} while (mask);
}

static int sa1100_gpio_suspend(void)
{
	/*
	 * Set the appropriate edges for wakeup.
	 */
	GRER = PWER & GPIO_IRQ_rising_edge;
	GFER = PWER & GPIO_IRQ_falling_edge;

	/*
	 * Clear any pending GPIO interrupts.
	 */
	GEDR = GEDR;

	return 0;
}

static void sa1100_gpio_resume(void)
{
	GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask;
	GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask;
}

static struct syscore_ops sa1100_gpio_syscore_ops = {
	.suspend	= sa1100_gpio_suspend,
	.resume		= sa1100_gpio_resume,
};

static int __init sa1100_gpio_init_devicefs(void)
{
	register_syscore_ops(&sa1100_gpio_syscore_ops);
	return 0;
}

device_initcall(sa1100_gpio_init_devicefs);

void __init sa1100_init_gpio(void)
{
	/* clear all GPIO edge detects */
	GFER = 0;
	GRER = 0;
	GEDR = -1;

	gpiochip_add_data(&sa1100_gpio_chip, NULL);

	sa1100_gpio_irqdomain = irq_domain_add_simple(NULL,
			28, IRQ_GPIO0,
			&sa1100_gpio_irqdomain_ops, NULL);

	/*
	 * Install handlers for GPIO 0-10 edge detect interrupts
	 */
	irq_set_chained_handler(IRQ_GPIO0_SC, sa1100_gpio_handler);
	irq_set_chained_handler(IRQ_GPIO1_SC, sa1100_gpio_handler);
	irq_set_chained_handler(IRQ_GPIO2_SC, sa1100_gpio_handler);
	irq_set_chained_handler(IRQ_GPIO3_SC, sa1100_gpio_handler);
	irq_set_chained_handler(IRQ_GPIO4_SC, sa1100_gpio_handler);
	irq_set_chained_handler(IRQ_GPIO5_SC, sa1100_gpio_handler);
	irq_set_chained_handler(IRQ_GPIO6_SC, sa1100_gpio_handler);
	irq_set_chained_handler(IRQ_GPIO7_SC, sa1100_gpio_handler);
	irq_set_chained_handler(IRQ_GPIO8_SC, sa1100_gpio_handler);
	irq_set_chained_handler(IRQ_GPIO9_SC, sa1100_gpio_handler);
	irq_set_chained_handler(IRQ_GPIO10_SC, sa1100_gpio_handler);
	/*
	 * Install handler for GPIO 11-27 edge detect interrupts
	 */
	irq_set_chained_handler(IRQ_GPIO11_27, sa1100_gpio_handler);

}
Commit	Line	Data
45528e38 DB	1	/*
	2	* linux/arch/arm/mach-sa1100/gpio.c
	3	*
	4	* Generic SA-1100 GPIO handling
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*/
2f8163ba	10	#include <linux/gpio.h>
45528e38 DB	11	#include <linux/init.h>
45528e38 DB	12	#include <linux/module.h>
40ca061b	13	#include <linux/io.h>
a0ea298d	14	#include <linux/syscore_ops.h>
a09e64fb	15	#include <mach/hardware.h>
f314f33b	16	#include <mach/irqs.h>
45528e38 DB	17
	18	static int sa1100_gpio_get(struct gpio_chip *chip, unsigned offset)
	19	{
6a681b61	20	return !!(GPLR & GPIO_GPIO(offset));
45528e38 DB	21	}
	22
	23	static void sa1100_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
	24	{
	25	if (value)
	26	GPSR = GPIO_GPIO(offset);
	27	else
	28	GPCR = GPIO_GPIO(offset);
	29	}
	30
	31	static int sa1100_direction_input(struct gpio_chip *chip, unsigned offset)
	32	{
	33	unsigned long flags;
	34
	35	local_irq_save(flags);
	36	GPDR &= ~GPIO_GPIO(offset);
	37	local_irq_restore(flags);
	38	return 0;
	39	}
	40
	41	static int sa1100_direction_output(struct gpio_chip *chip, unsigned offset, int value)
	42	{
	43	unsigned long flags;
	44
	45	local_irq_save(flags);
	46	sa1100_gpio_set(chip, offset, value);
	47	GPDR \|= GPIO_GPIO(offset);
	48	local_irq_restore(flags);
	49	return 0;
	50	}
	51
f408c985 RK	52	static int sa1100_to_irq(struct gpio_chip *chip, unsigned offset)
f408c985 RK	53	{
83508093	54	return IRQ_GPIO0 + offset;
f408c985 RK	55	}
f408c985 RK	56
45528e38 DB	57	static struct gpio_chip sa1100_gpio_chip = {
	58	.label = "gpio",
	59	.direction_input = sa1100_direction_input,
	60	.direction_output = sa1100_direction_output,
	61	.set = sa1100_gpio_set,
	62	.get = sa1100_gpio_get,
f408c985	63	.to_irq = sa1100_to_irq,
45528e38 DB	64	.base = 0,
	65	.ngpio = GPIO_MAX + 1,
	66	};
	67
a0ea298d DB	68	/*
	69	* SA1100 GPIO edge detection for IRQs:
	70	* IRQs are generated on Falling-Edge, Rising-Edge, or both.
	71	* Use this instead of directly setting GRER/GFER.
	72	*/
	73	static int GPIO_IRQ_rising_edge;
	74	static int GPIO_IRQ_falling_edge;
	75	static int GPIO_IRQ_mask;
	76
	77	static int sa1100_gpio_type(struct irq_data *d, unsigned int type)
	78	{
	79	unsigned int mask;
	80
	81	mask = BIT(d->hwirq);
	82
	83	if (type == IRQ_TYPE_PROBE) {
	84	if ((GPIO_IRQ_rising_edge \| GPIO_IRQ_falling_edge) & mask)
	85	return 0;
	86	type = IRQ_TYPE_EDGE_RISING \| IRQ_TYPE_EDGE_FALLING;
	87	}
	88
	89	if (type & IRQ_TYPE_EDGE_RISING)
	90	GPIO_IRQ_rising_edge \|= mask;
	91	else
	92	GPIO_IRQ_rising_edge &= ~mask;
	93	if (type & IRQ_TYPE_EDGE_FALLING)
	94	GPIO_IRQ_falling_edge \|= mask;
	95	else
	96	GPIO_IRQ_falling_edge &= ~mask;
	97
	98	GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask;
	99	GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask;
	100
	101	return 0;
	102	}
	103
	104	/*
	105	* GPIO IRQs must be acknowledged.
	106	*/
	107	static void sa1100_gpio_ack(struct irq_data *d)
	108	{
	109	GEDR = BIT(d->hwirq);
	110	}
	111
	112	static void sa1100_gpio_mask(struct irq_data *d)
	113	{
	114	unsigned int mask = BIT(d->hwirq);
	115
	116	GPIO_IRQ_mask &= ~mask;
	117
	118	GRER &= ~mask;
	119	GFER &= ~mask;
	120	}
	121
	122	static void sa1100_gpio_unmask(struct irq_data *d)
	123	{
	124	unsigned int mask = BIT(d->hwirq);
	125
	126	GPIO_IRQ_mask \|= mask;
	127
	128	GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask;
	129	GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask;
	130	}
	131
132	static int sa1100_gpio_wake(struct irq_data *d, unsigned int on)
133	{
134	if (on)
135	PWER \|= BIT(d->hwirq);
136	else
137	PWER &= ~BIT(d->hwirq);
138	return 0;
139	}
140
141	/*
142	* This is for GPIO IRQs
143	*/
144	static struct irq_chip sa1100_gpio_irq_chip = {
145	.name = "GPIO",
146	.irq_ack = sa1100_gpio_ack,
147	.irq_mask = sa1100_gpio_mask,
148	.irq_unmask = sa1100_gpio_unmask,
149	.irq_set_type = sa1100_gpio_type,
150	.irq_set_wake = sa1100_gpio_wake,
151	};
152
153	static int sa1100_gpio_irqdomain_map(struct irq_domain *d,
154	unsigned int irq, irq_hw_number_t hwirq)
155	{
156	irq_set_chip_and_handler(irq, &sa1100_gpio_irq_chip,
157	handle_edge_irq);
23393d49	158	irq_set_noprobe(irq);
a0ea298d DB	159
	160	return 0;
	161	}
	162
0b354dc4	163	static const struct irq_domain_ops sa1100_gpio_irqdomain_ops = {
a0ea298d DB	164	.map = sa1100_gpio_irqdomain_map,
	165	.xlate = irq_domain_xlate_onetwocell,
	166	};
	167
	168	static struct irq_domain *sa1100_gpio_irqdomain;
	169
	170	/*
	171	* IRQ 0-11 (GPIO) handler. We enter here with the
	172	* irq_controller_lock held, and IRQs disabled. Decode the IRQ
	173	* and call the handler.
	174	*/
bd0b9ac4	175	static void sa1100_gpio_handler(struct irq_desc *desc)
a0ea298d	176	{
2951a799	177	unsigned int irq, mask;
a0ea298d DB	178
	179	mask = GEDR;
	180	do {
	181	/*
	182	* clear down all currently active IRQ sources.
	183	* We will be processing them all.
	184	*/
	185	GEDR = mask;
	186
	187	irq = IRQ_GPIO0;
	188	do {
	189	if (mask & 1)
	190	generic_handle_irq(irq);
	191	mask >>= 1;
	192	irq++;
	193	} while (mask);
	194
	195	mask = GEDR;
	196	} while (mask);
	197	}
	198
	199	static int sa1100_gpio_suspend(void)
	200	{
	201	/*
	202	* Set the appropriate edges for wakeup.
	203	*/
	204	GRER = PWER & GPIO_IRQ_rising_edge;
	205	GFER = PWER & GPIO_IRQ_falling_edge;
	206
	207	/*
	208	* Clear any pending GPIO interrupts.
	209	*/
	210	GEDR = GEDR;
	211
	212	return 0;
	213	}
	214
	215	static void sa1100_gpio_resume(void)
	216	{
	217	GRER = GPIO_IRQ_rising_edge & GPIO_IRQ_mask;
	218	GFER = GPIO_IRQ_falling_edge & GPIO_IRQ_mask;
	219	}
	220
	221	static struct syscore_ops sa1100_gpio_syscore_ops = {
	222	.suspend = sa1100_gpio_suspend,
	223	.resume = sa1100_gpio_resume,
	224	};
	225
	226	static int __init sa1100_gpio_init_devicefs(void)
	227	{
	228	register_syscore_ops(&sa1100_gpio_syscore_ops);
	229	return 0;
	230	}
	231
	232	device_initcall(sa1100_gpio_init_devicefs);
	233
45528e38 DB	234	void __init sa1100_init_gpio(void)
45528e38 DB	235	{
a0ea298d DB	236	/* clear all GPIO edge detects */
	237	GFER = 0;
	238	GRER = 0;
	239	GEDR = -1;
	240
4eab22e7	241	gpiochip_add_data(&sa1100_gpio_chip, NULL);
a0ea298d DB	242
	243	sa1100_gpio_irqdomain = irq_domain_add_simple(NULL,
	244	28, IRQ_GPIO0,
	245	&sa1100_gpio_irqdomain_ops, NULL);
	246
	247	/*
	248	* Install handlers for GPIO 0-10 edge detect interrupts
	249	*/
	250	irq_set_chained_handler(IRQ_GPIO0_SC, sa1100_gpio_handler);
	251	irq_set_chained_handler(IRQ_GPIO1_SC, sa1100_gpio_handler);
	252	irq_set_chained_handler(IRQ_GPIO2_SC, sa1100_gpio_handler);
	253	irq_set_chained_handler(IRQ_GPIO3_SC, sa1100_gpio_handler);
	254	irq_set_chained_handler(IRQ_GPIO4_SC, sa1100_gpio_handler);
	255	irq_set_chained_handler(IRQ_GPIO5_SC, sa1100_gpio_handler);
	256	irq_set_chained_handler(IRQ_GPIO6_SC, sa1100_gpio_handler);
	257	irq_set_chained_handler(IRQ_GPIO7_SC, sa1100_gpio_handler);
	258	irq_set_chained_handler(IRQ_GPIO8_SC, sa1100_gpio_handler);
	259	irq_set_chained_handler(IRQ_GPIO9_SC, sa1100_gpio_handler);
	260	irq_set_chained_handler(IRQ_GPIO10_SC, sa1100_gpio_handler);
	261	/*
	262	* Install handler for GPIO 11-27 edge detect interrupts
	263	*/
	264	irq_set_chained_handler(IRQ_GPIO11_27, sa1100_gpio_handler);
	265
45528e38	266	}