[linux-2.6-block.git] / drivers / mfd / tps65910-irq.c

/*
 * tps65910-irq.c  --  TI TPS6591x
 *
 * Copyright 2010 Texas Instruments Inc.
 *
 * Author: Graeme Gregory <gg@slimlogic.co.uk>
 * Author: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>
 *
 *  This program is free software; you can redistribute it and/or modify it
 *  under  the terms of the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the License, or (at your
 *  option) any later version.
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/bug.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/gpio.h>
#include <linux/mfd/tps65910.h>

static inline int irq_to_tps65910_irq(struct tps65910 *tps65910,
							int irq)
{
	return (irq - tps65910->irq_base);
}

/*
 * This is a threaded IRQ handler so can access I2C/SPI.  Since all
 * interrupts are clear on read the IRQ line will be reasserted and
 * the physical IRQ will be handled again if another interrupt is
 * asserted while we run - in the normal course of events this is a
 * rare occurrence so we save I2C/SPI reads.  We're also assuming that
 * it's rare to get lots of interrupts firing simultaneously so try to
 * minimise I/O.
 */
static irqreturn_t tps65910_irq(int irq, void *irq_data)
{
	struct tps65910 *tps65910 = irq_data;
	u32 irq_sts;
	u32 irq_mask;
	u8 reg;
	int i;

	tps65910->read(tps65910, TPS65910_INT_STS, 1, &reg);
	irq_sts = reg;
	tps65910->read(tps65910, TPS65910_INT_STS2, 1, &reg);
	irq_sts |= reg << 8;
	switch (tps65910_chip_id(tps65910)) {
	case TPS65911:
		tps65910->read(tps65910, TPS65910_INT_STS3, 1, &reg);
		irq_sts |= reg << 16;
	}

	tps65910->read(tps65910, TPS65910_INT_MSK, 1, &reg);
	irq_mask = reg;
	tps65910->read(tps65910, TPS65910_INT_MSK2, 1, &reg);
	irq_mask |= reg << 8;
	switch (tps65910_chip_id(tps65910)) {
	case TPS65911:
		tps65910->read(tps65910, TPS65910_INT_MSK3, 1, &reg);
		irq_mask |= reg << 16;
	}

	irq_sts &= ~irq_mask;

	if (!irq_sts)
		return IRQ_NONE;

	for (i = 0; i < tps65910->irq_num; i++) {

		if (!(irq_sts & (1 << i)))
			continue;

		handle_nested_irq(tps65910->irq_base + i);
	}

	/* Write the STS register back to clear IRQs we handled */
	reg = irq_sts & 0xFF;
	irq_sts >>= 8;
	tps65910->write(tps65910, TPS65910_INT_STS, 1, &reg);
	reg = irq_sts & 0xFF;
	tps65910->write(tps65910, TPS65910_INT_STS2, 1, &reg);
	switch (tps65910_chip_id(tps65910)) {
	case TPS65911:
		reg = irq_sts >> 8;
		tps65910->write(tps65910, TPS65910_INT_STS3, 1, &reg);
	}

	return IRQ_HANDLED;
}

static void tps65910_irq_lock(struct irq_data *data)
{
	struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data);

	mutex_lock(&tps65910->irq_lock);
}

static void tps65910_irq_sync_unlock(struct irq_data *data)
{
	struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data);
	u32 reg_mask;
	u8 reg;

	tps65910->read(tps65910, TPS65910_INT_MSK, 1, &reg);
	reg_mask = reg;
	tps65910->read(tps65910, TPS65910_INT_MSK2, 1, &reg);
	reg_mask |= reg << 8;
	switch (tps65910_chip_id(tps65910)) {
	case TPS65911:
		tps65910->read(tps65910, TPS65910_INT_MSK3, 1, &reg);
		reg_mask |= reg << 16;
	}

	if (tps65910->irq_mask != reg_mask) {
		reg = tps65910->irq_mask & 0xFF;
		tps65910->write(tps65910, TPS65910_INT_MSK, 1, &reg);
		reg = tps65910->irq_mask >> 8 & 0xFF;
		tps65910->write(tps65910, TPS65910_INT_MSK2, 1, &reg);
		switch (tps65910_chip_id(tps65910)) {
		case TPS65911:
			reg = tps65910->irq_mask >> 16;
			tps65910->write(tps65910, TPS65910_INT_MSK3, 1, &reg);
		}
	}
	mutex_unlock(&tps65910->irq_lock);
}

static void tps65910_irq_enable(struct irq_data *data)
{
	struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data);

	tps65910->irq_mask &= ~( 1 << irq_to_tps65910_irq(tps65910, data->irq));
}

static void tps65910_irq_disable(struct irq_data *data)
{
	struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data);

	tps65910->irq_mask |= ( 1 << irq_to_tps65910_irq(tps65910, data->irq));
}

static struct irq_chip tps65910_irq_chip = {
	.name = "tps65910",
	.irq_bus_lock = tps65910_irq_lock,
	.irq_bus_sync_unlock = tps65910_irq_sync_unlock,
	.irq_disable = tps65910_irq_disable,
	.irq_enable = tps65910_irq_enable,
};

int tps65910_irq_init(struct tps65910 *tps65910, int irq,
		    struct tps65910_platform_data *pdata)
{
	int ret, cur_irq;
	int flags = IRQF_ONESHOT;

	if (!irq) {
		dev_warn(tps65910->dev, "No interrupt support, no core IRQ\n");
		return -EINVAL;
	}

	if (!pdata || !pdata->irq_base) {
		dev_warn(tps65910->dev, "No interrupt support, no IRQ base\n");
		return -EINVAL;
	}

	tps65910->irq_mask = 0xFFFFFF;

	mutex_init(&tps65910->irq_lock);
	tps65910->chip_irq = irq;
	tps65910->irq_base = pdata->irq_base;

	switch (tps65910_chip_id(tps65910)) {
	case TPS65910:
		tps65910->irq_num = TPS65910_NUM_IRQ;
	case TPS65911:
		tps65910->irq_num = TPS65911_NUM_IRQ;
	}

	/* Register with genirq */
	for (cur_irq = tps65910->irq_base;
	     cur_irq < tps65910->irq_num + tps65910->irq_base;
	     cur_irq++) {
		irq_set_chip_data(cur_irq, tps65910);
		irq_set_chip_and_handler(cur_irq, &tps65910_irq_chip,
					 handle_edge_irq);
		irq_set_nested_thread(cur_irq, 1);

		/* ARM needs us to explicitly flag the IRQ as valid
		 * and will set them noprobe when we do so. */
#ifdef CONFIG_ARM
		set_irq_flags(cur_irq, IRQF_VALID);
#else
		irq_set_noprobe(cur_irq);
#endif
	}

	ret = request_threaded_irq(irq, NULL, tps65910_irq, flags,
				   "tps65910", tps65910);

	irq_set_irq_type(irq, IRQ_TYPE_LEVEL_LOW);

	if (ret != 0)
		dev_err(tps65910->dev, "Failed to request IRQ: %d\n", ret);

	return ret;
}

int tps65910_irq_exit(struct tps65910 *tps65910)
{
	free_irq(tps65910->chip_irq, tps65910);
	return 0;
}
Commit	Line	Data
e3471bdc GG	1	/*
	2	* tps65910-irq.c -- TI TPS6591x
	3	*
	4	* Copyright 2010 Texas Instruments Inc.
	5	*
	6	* Author: Graeme Gregory <gg@slimlogic.co.uk>
	7	* Author: Jorge Eduardo Candelaria <jedu@slimlogic.co.uk>
	8	*
	9	* This program is free software; you can redistribute it and/or modify it
	10	* under the terms of the GNU General Public License as published by the
	11	* Free Software Foundation; either version 2 of the License, or (at your
	12	* option) any later version.
	13	*
	14	*/
	15
	16	#include <linux/kernel.h>
	17	#include <linux/module.h>
	18	#include <linux/init.h>
	19	#include <linux/bug.h>
	20	#include <linux/device.h>
	21	#include <linux/interrupt.h>
	22	#include <linux/irq.h>
	23	#include <linux/gpio.h>
	24	#include <linux/mfd/tps65910.h>
	25
	26	static inline int irq_to_tps65910_irq(struct tps65910 *tps65910,
	27	int irq)
	28	{
	29	return (irq - tps65910->irq_base);
	30	}
	31
	32	/*
	33	* This is a threaded IRQ handler so can access I2C/SPI. Since all
	34	* interrupts are clear on read the IRQ line will be reasserted and
	35	* the physical IRQ will be handled again if another interrupt is
	36	* asserted while we run - in the normal course of events this is a
	37	* rare occurrence so we save I2C/SPI reads. We're also assuming that
	38	* it's rare to get lots of interrupts firing simultaneously so try to
	39	* minimise I/O.
	40	*/
	41	static irqreturn_t tps65910_irq(int irq, void *irq_data)
	42	{
	43	struct tps65910 *tps65910 = irq_data;
a2974732 JEC	44	u32 irq_sts;
a2974732 JEC	45	u32 irq_mask;
e3471bdc GG	46	u8 reg;
	47	int i;
	48
	49	tps65910->read(tps65910, TPS65910_INT_STS, 1, &reg);
	50	irq_sts = reg;
	51	tps65910->read(tps65910, TPS65910_INT_STS2, 1, &reg);
	52	irq_sts \|= reg << 8;
a2974732 JEC	53	switch (tps65910_chip_id(tps65910)) {
	54	case TPS65911:
	55	tps65910->read(tps65910, TPS65910_INT_STS3, 1, &reg);
	56	irq_sts \|= reg << 16;
	57	}
e3471bdc GG	58
	59	tps65910->read(tps65910, TPS65910_INT_MSK, 1, &reg);
	60	irq_mask = reg;
	61	tps65910->read(tps65910, TPS65910_INT_MSK2, 1, &reg);
	62	irq_mask \|= reg << 8;
a2974732 JEC	63	switch (tps65910_chip_id(tps65910)) {
	64	case TPS65911:
	65	tps65910->read(tps65910, TPS65910_INT_MSK3, 1, &reg);
	66	irq_mask \|= reg << 16;
	67	}
e3471bdc GG	68
	69	irq_sts &= ~irq_mask;
	70
	71	if (!irq_sts)
	72	return IRQ_NONE;
	73
a2974732	74	for (i = 0; i < tps65910->irq_num; i++) {
e3471bdc GG	75
	76	if (!(irq_sts & (1 << i)))
	77	continue;
	78
	79	handle_nested_irq(tps65910->irq_base + i);
	80	}
	81
	82	/* Write the STS register back to clear IRQs we handled */
	83	reg = irq_sts & 0xFF;
a2974732	84	irq_sts >>= 8;
e3471bdc	85	tps65910->write(tps65910, TPS65910_INT_STS, 1, &reg);
a2974732	86	reg = irq_sts & 0xFF;
e3471bdc	87	tps65910->write(tps65910, TPS65910_INT_STS2, 1, &reg);
a2974732 JEC	88	switch (tps65910_chip_id(tps65910)) {
	89	case TPS65911:
	90	reg = irq_sts >> 8;
	91	tps65910->write(tps65910, TPS65910_INT_STS3, 1, &reg);
	92	}
e3471bdc GG	93
	94	return IRQ_HANDLED;
	95	}
	96
	97	static void tps65910_irq_lock(struct irq_data *data)
	98	{
	99	struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data);
	100
	101	mutex_lock(&tps65910->irq_lock);
	102	}
	103
	104	static void tps65910_irq_sync_unlock(struct irq_data *data)
	105	{
	106	struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data);
a2974732	107	u32 reg_mask;
e3471bdc GG	108	u8 reg;
	109
	110	tps65910->read(tps65910, TPS65910_INT_MSK, 1, &reg);
	111	reg_mask = reg;
	112	tps65910->read(tps65910, TPS65910_INT_MSK2, 1, &reg);
	113	reg_mask \|= reg << 8;
a2974732 JEC	114	switch (tps65910_chip_id(tps65910)) {
	115	case TPS65911:
	116	tps65910->read(tps65910, TPS65910_INT_MSK3, 1, &reg);
	117	reg_mask \|= reg << 16;
	118	}
e3471bdc GG	119
	120	if (tps65910->irq_mask != reg_mask) {
	121	reg = tps65910->irq_mask & 0xFF;
	122	tps65910->write(tps65910, TPS65910_INT_MSK, 1, &reg);
a2974732	123	reg = tps65910->irq_mask >> 8 & 0xFF;
e3471bdc	124	tps65910->write(tps65910, TPS65910_INT_MSK2, 1, &reg);
a2974732 JEC	125	switch (tps65910_chip_id(tps65910)) {
	126	case TPS65911:
	127	reg = tps65910->irq_mask >> 16;
	128	tps65910->write(tps65910, TPS65910_INT_MSK3, 1, &reg);
	129	}
e3471bdc GG	130	}
	131	mutex_unlock(&tps65910->irq_lock);
	132	}
	133
	134	static void tps65910_irq_enable(struct irq_data *data)
	135	{
	136	struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data);
	137
	138	tps65910->irq_mask &= ~( 1 << irq_to_tps65910_irq(tps65910, data->irq));
	139	}
	140
	141	static void tps65910_irq_disable(struct irq_data *data)
	142	{
	143	struct tps65910 *tps65910 = irq_data_get_irq_chip_data(data);
	144
	145	tps65910->irq_mask \|= ( 1 << irq_to_tps65910_irq(tps65910, data->irq));
	146	}
	147
	148	static struct irq_chip tps65910_irq_chip = {
	149	.name = "tps65910",
	150	.irq_bus_lock = tps65910_irq_lock,
	151	.irq_bus_sync_unlock = tps65910_irq_sync_unlock,
	152	.irq_disable = tps65910_irq_disable,
	153	.irq_enable = tps65910_irq_enable,
	154	};
	155
	156	int tps65910_irq_init(struct tps65910 *tps65910, int irq,
	157	struct tps65910_platform_data *pdata)
	158	{
	159	int ret, cur_irq;
	160	int flags = IRQF_ONESHOT;
e3471bdc GG	161
	162	if (!irq) {
	163	dev_warn(tps65910->dev, "No interrupt support, no core IRQ\n");
	164	return -EINVAL;
	165	}
	166
	167	if (!pdata \|\| !pdata->irq_base) {
	168	dev_warn(tps65910->dev, "No interrupt support, no IRQ base\n");
	169	return -EINVAL;
	170	}
	171
a2974732	172	tps65910->irq_mask = 0xFFFFFF;
e3471bdc GG	173
	174	mutex_init(&tps65910->irq_lock);
	175	tps65910->chip_irq = irq;
	176	tps65910->irq_base = pdata->irq_base;
	177
a2974732 JEC	178	switch (tps65910_chip_id(tps65910)) {
	179	case TPS65910:
	180	tps65910->irq_num = TPS65910_NUM_IRQ;
	181	case TPS65911:
	182	tps65910->irq_num = TPS65911_NUM_IRQ;
	183	}
	184
e3471bdc GG	185	/* Register with genirq */
e3471bdc GG	186	for (cur_irq = tps65910->irq_base;
a2974732	187	cur_irq < tps65910->irq_num + tps65910->irq_base;
e3471bdc GG	188	cur_irq++) {
	189	irq_set_chip_data(cur_irq, tps65910);
	190	irq_set_chip_and_handler(cur_irq, &tps65910_irq_chip,
	191	handle_edge_irq);
	192	irq_set_nested_thread(cur_irq, 1);
	193
	194	/* ARM needs us to explicitly flag the IRQ as valid
	195	* and will set them noprobe when we do so. */
	196	#ifdef CONFIG_ARM
	197	set_irq_flags(cur_irq, IRQF_VALID);
	198	#else
	199	irq_set_noprobe(cur_irq);
	200	#endif
	201	}
	202
	203	ret = request_threaded_irq(irq, NULL, tps65910_irq, flags,
	204	"tps65910", tps65910);
a2974732 JEC	205
	206	irq_set_irq_type(irq, IRQ_TYPE_LEVEL_LOW);
	207
e3471bdc GG	208	if (ret != 0)
	209	dev_err(tps65910->dev, "Failed to request IRQ: %d\n", ret);
	210
	211	return ret;
	212	}
	213
	214	int tps65910_irq_exit(struct tps65910 *tps65910)
	215	{
	216	free_irq(tps65910->chip_irq, tps65910);
	217	return 0;
	218	}