[linux-block.git] / arch / arm / plat-mxc / gpio.c

/*
 * MXC GPIO support. (c) 2008 Daniel Mack <daniel@caiaq.de>
 * Copyright 2008 Juergen Beisert, kernel@pengutronix.de
 *
 * Based on code from Freescale,
 * Copyright 2004-2006 Freescale Semiconductor, Inc. All Rights Reserved.
 *
 * 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.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

#include <linux/init.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/gpio.h>
#include <mach/hardware.h>
#include <asm-generic/bug.h>

static struct mxc_gpio_port *mxc_gpio_ports;
static int gpio_table_size;

#define cpu_is_mx1_mx2()	(cpu_is_mx1() || cpu_is_mx2())

#define GPIO_DR		(cpu_is_mx1_mx2() ? 0x1c : 0x00)
#define GPIO_GDIR	(cpu_is_mx1_mx2() ? 0x00 : 0x04)
#define GPIO_PSR	(cpu_is_mx1_mx2() ? 0x24 : 0x08)
#define GPIO_ICR1	(cpu_is_mx1_mx2() ? 0x28 : 0x0C)
#define GPIO_ICR2	(cpu_is_mx1_mx2() ? 0x2C : 0x10)
#define GPIO_IMR	(cpu_is_mx1_mx2() ? 0x30 : 0x14)
#define GPIO_ISR	(cpu_is_mx1_mx2() ? 0x34 : 0x18)
#define GPIO_ISR	(cpu_is_mx1_mx2() ? 0x34 : 0x18)

#define GPIO_INT_LOW_LEV	(cpu_is_mx1_mx2() ? 0x3 : 0x0)
#define GPIO_INT_HIGH_LEV	(cpu_is_mx1_mx2() ? 0x2 : 0x1)
#define GPIO_INT_RISE_EDGE	(cpu_is_mx1_mx2() ? 0x0 : 0x2)
#define GPIO_INT_FALL_EDGE	(cpu_is_mx1_mx2() ? 0x1 : 0x3)
#define GPIO_INT_NONE		0x4

/* Note: This driver assumes 32 GPIOs are handled in one register */

static void _clear_gpio_irqstatus(struct mxc_gpio_port *port, u32 index)
{
	__raw_writel(1 << index, port->base + GPIO_ISR);
}

static void _set_gpio_irqenable(struct mxc_gpio_port *port, u32 index,
				int enable)
{
	u32 l;

	l = __raw_readl(port->base + GPIO_IMR);
	l = (l & (~(1 << index))) | (!!enable << index);
	__raw_writel(l, port->base + GPIO_IMR);
}

static void gpio_ack_irq(u32 irq)
{
	u32 gpio = irq_to_gpio(irq);
	_clear_gpio_irqstatus(&mxc_gpio_ports[gpio / 32], gpio & 0x1f);
}

static void gpio_mask_irq(u32 irq)
{
	u32 gpio = irq_to_gpio(irq);
	_set_gpio_irqenable(&mxc_gpio_ports[gpio / 32], gpio & 0x1f, 0);
}

static void gpio_unmask_irq(u32 irq)
{
	u32 gpio = irq_to_gpio(irq);
	_set_gpio_irqenable(&mxc_gpio_ports[gpio / 32], gpio & 0x1f, 1);
}

static int mxc_gpio_get(struct gpio_chip *chip, unsigned offset);

static int gpio_set_irq_type(u32 irq, u32 type)
{
	u32 gpio = irq_to_gpio(irq);
	struct mxc_gpio_port *port = &mxc_gpio_ports[gpio / 32];
	u32 bit, val;
	int edge;
	void __iomem *reg = port->base;

	port->both_edges &= ~(1 << (gpio & 31));
	switch (type) {
	case IRQ_TYPE_EDGE_RISING:
		edge = GPIO_INT_RISE_EDGE;
		break;
	case IRQ_TYPE_EDGE_FALLING:
		edge = GPIO_INT_FALL_EDGE;
		break;
	case IRQ_TYPE_EDGE_BOTH:
		val = mxc_gpio_get(&port->chip, gpio & 31);
		if (val) {
			edge = GPIO_INT_LOW_LEV;
			pr_debug("mxc: set GPIO %d to low trigger\n", gpio);
		} else {
			edge = GPIO_INT_HIGH_LEV;
			pr_debug("mxc: set GPIO %d to high trigger\n", gpio);
		}
		port->both_edges |= 1 << (gpio & 31);
		break;
	case IRQ_TYPE_LEVEL_LOW:
		edge = GPIO_INT_LOW_LEV;
		break;
	case IRQ_TYPE_LEVEL_HIGH:
		edge = GPIO_INT_HIGH_LEV;
		break;
	default:
		return -EINVAL;
	}

	reg += GPIO_ICR1 + ((gpio & 0x10) >> 2); /* lower or upper register */
	bit = gpio & 0xf;
	val = __raw_readl(reg) & ~(0x3 << (bit << 1));
	__raw_writel(val | (edge << (bit << 1)), reg);
	_clear_gpio_irqstatus(port, gpio & 0x1f);

	return 0;
}

static void mxc_flip_edge(struct mxc_gpio_port *port, u32 gpio)
{
	void __iomem *reg = port->base;
	u32 bit, val;
	int edge;

	reg += GPIO_ICR1 + ((gpio & 0x10) >> 2); /* lower or upper register */
	bit = gpio & 0xf;
	val = __raw_readl(reg);
	edge = (val >> (bit << 1)) & 3;
	val &= ~(0x3 << (bit << 1));
	switch (edge) {
	case GPIO_INT_HIGH_LEV:
		edge = GPIO_INT_LOW_LEV;
		pr_debug("mxc: switch GPIO %d to low trigger\n", gpio);
		break;
	case GPIO_INT_LOW_LEV:
		edge = GPIO_INT_HIGH_LEV;
		pr_debug("mxc: switch GPIO %d to high trigger\n", gpio);
		break;
	default:
		pr_err("mxc: invalid configuration for GPIO %d: %x\n",
		       gpio, edge);
		return;
	}
	__raw_writel(val | (edge << (bit << 1)), reg);
}

/* handle n interrupts in one status register */
static void mxc_gpio_irq_handler(struct mxc_gpio_port *port, u32 irq_stat)
{
	u32 gpio_irq_no;

	gpio_irq_no = port->virtual_irq_start;
	for (; irq_stat != 0; irq_stat >>= 1, gpio_irq_no++) {
		u32 gpio = irq_to_gpio(gpio_irq_no);

		if ((irq_stat & 1) == 0)
			continue;

		BUG_ON(!(irq_desc[gpio_irq_no].handle_irq));

		if (port->both_edges & (1 << (gpio & 31)))
			mxc_flip_edge(port, gpio);

		irq_desc[gpio_irq_no].handle_irq(gpio_irq_no,
				&irq_desc[gpio_irq_no]);
	}
}

/* MX1 and MX3 has one interrupt *per* gpio port */
static void mx3_gpio_irq_handler(u32 irq, struct irq_desc *desc)
{
	u32 irq_stat;
	struct mxc_gpio_port *port = (struct mxc_gpio_port *)get_irq_data(irq);

	irq_stat = __raw_readl(port->base + GPIO_ISR) &
			__raw_readl(port->base + GPIO_IMR);

	mxc_gpio_irq_handler(port, irq_stat);
}

/* MX2 has one interrupt *for all* gpio ports */
static void mx2_gpio_irq_handler(u32 irq, struct irq_desc *desc)
{
	int i;
	u32 irq_msk, irq_stat;
	struct mxc_gpio_port *port = (struct mxc_gpio_port *)get_irq_data(irq);

	/* walk through all interrupt status registers */
	for (i = 0; i < gpio_table_size; i++) {
		irq_msk = __raw_readl(port[i].base + GPIO_IMR);
		if (!irq_msk)
			continue;

		irq_stat = __raw_readl(port[i].base + GPIO_ISR) & irq_msk;
		if (irq_stat)
			mxc_gpio_irq_handler(&port[i], irq_stat);
	}
}

static struct irq_chip gpio_irq_chip = {
	.ack = gpio_ack_irq,
	.mask = gpio_mask_irq,
	.unmask = gpio_unmask_irq,
	.set_type = gpio_set_irq_type,
};

static void _set_gpio_direction(struct gpio_chip *chip, unsigned offset,
				int dir)
{
	struct mxc_gpio_port *port =
		container_of(chip, struct mxc_gpio_port, chip);
	u32 l;

	l = __raw_readl(port->base + GPIO_GDIR);
	if (dir)
		l |= 1 << offset;
	else
		l &= ~(1 << offset);
	__raw_writel(l, port->base + GPIO_GDIR);
}

static void mxc_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
{
	struct mxc_gpio_port *port =
		container_of(chip, struct mxc_gpio_port, chip);
	void __iomem *reg = port->base + GPIO_DR;
	u32 l;

	l = (__raw_readl(reg) & (~(1 << offset))) | (value << offset);
	__raw_writel(l, reg);
}

static int mxc_gpio_get(struct gpio_chip *chip, unsigned offset)
{
	struct mxc_gpio_port *port =
		container_of(chip, struct mxc_gpio_port, chip);

	return (__raw_readl(port->base + GPIO_PSR) >> offset) & 1;
}

static int mxc_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
	_set_gpio_direction(chip, offset, 0);
	return 0;
}

static int mxc_gpio_direction_output(struct gpio_chip *chip,
				     unsigned offset, int value)
{
	mxc_gpio_set(chip, offset, value);
	_set_gpio_direction(chip, offset, 1);
	return 0;
}

int __init mxc_gpio_init(struct mxc_gpio_port *port, int cnt)
{
	int i, j;

	/* save for local usage */
	mxc_gpio_ports = port;
	gpio_table_size = cnt;

	printk(KERN_INFO "MXC GPIO hardware\n");

	for (i = 0; i < cnt; i++) {
		/* disable the interrupt and clear the status */
		__raw_writel(0, port[i].base + GPIO_IMR);
		__raw_writel(~0, port[i].base + GPIO_ISR);
		for (j = port[i].virtual_irq_start;
			j < port[i].virtual_irq_start + 32; j++) {
			set_irq_chip(j, &gpio_irq_chip);
			set_irq_handler(j, handle_edge_irq);
			set_irq_flags(j, IRQF_VALID);
		}

		/* register gpio chip */
		port[i].chip.direction_input = mxc_gpio_direction_input;
		port[i].chip.direction_output = mxc_gpio_direction_output;
		port[i].chip.get = mxc_gpio_get;
		port[i].chip.set = mxc_gpio_set;
		port[i].chip.base = i * 32;
		port[i].chip.ngpio = 32;

		/* its a serious configuration bug when it fails */
		BUG_ON( gpiochip_add(&port[i].chip) < 0 );

		if (cpu_is_mx1() || cpu_is_mx3() || cpu_is_mx25()) {
			/* setup one handler for each entry */
			set_irq_chained_handler(port[i].irq, mx3_gpio_irq_handler);
			set_irq_data(port[i].irq, &port[i]);
		}
	}

	if (cpu_is_mx2()) {
		/* setup one handler for all GPIO interrupts */
		set_irq_chained_handler(port[0].irq, mx2_gpio_irq_handler);
		set_irq_data(port[0].irq, port);
	}

	return 0;
}
Commit	Line	Data
07bd1a6c JB	1	/*
	2	* MXC GPIO support. (c) 2008 Daniel Mack <daniel@caiaq.de>
	3	* Copyright 2008 Juergen Beisert, kernel@pengutronix.de
	4	*
	5	* Based on code from Freescale,
	6	* Copyright 2004-2006 Freescale Semiconductor, Inc. All Rights Reserved.
	7	*
	8	* This program is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU General Public License
	10	* as published by the Free Software Foundation; either version 2
	11	* of the License, or (at your option) any later version.
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
	20	*/
	21
	22	#include <linux/init.h>
	23	#include <linux/io.h>
	24	#include <linux/irq.h>
	25	#include <linux/gpio.h>
a09e64fb	26	#include <mach/hardware.h>
07bd1a6c JB	27	#include <asm-generic/bug.h>
	28
	29	static struct mxc_gpio_port *mxc_gpio_ports;
	30	static int gpio_table_size;
	31
494f22dd SH	32	#define cpu_is_mx1_mx2() (cpu_is_mx1() \|\| cpu_is_mx2())
	33
	34	#define GPIO_DR (cpu_is_mx1_mx2() ? 0x1c : 0x00)
	35	#define GPIO_GDIR (cpu_is_mx1_mx2() ? 0x00 : 0x04)
	36	#define GPIO_PSR (cpu_is_mx1_mx2() ? 0x24 : 0x08)
	37	#define GPIO_ICR1 (cpu_is_mx1_mx2() ? 0x28 : 0x0C)
	38	#define GPIO_ICR2 (cpu_is_mx1_mx2() ? 0x2C : 0x10)
	39	#define GPIO_IMR (cpu_is_mx1_mx2() ? 0x30 : 0x14)
	40	#define GPIO_ISR (cpu_is_mx1_mx2() ? 0x34 : 0x18)
	41	#define GPIO_ISR (cpu_is_mx1_mx2() ? 0x34 : 0x18)
	42
	43	#define GPIO_INT_LOW_LEV (cpu_is_mx1_mx2() ? 0x3 : 0x0)
	44	#define GPIO_INT_HIGH_LEV (cpu_is_mx1_mx2() ? 0x2 : 0x1)
	45	#define GPIO_INT_RISE_EDGE (cpu_is_mx1_mx2() ? 0x0 : 0x2)
	46	#define GPIO_INT_FALL_EDGE (cpu_is_mx1_mx2() ? 0x1 : 0x3)
	47	#define GPIO_INT_NONE 0x4
	48
07bd1a6c JB	49	/* Note: This driver assumes 32 GPIOs are handled in one register */
	50
	51	static void _clear_gpio_irqstatus(struct mxc_gpio_port *port, u32 index)
	52	{
	53	__raw_writel(1 << index, port->base + GPIO_ISR);
	54	}
	55
	56	static void _set_gpio_irqenable(struct mxc_gpio_port *port, u32 index,
	57	int enable)
	58	{
	59	u32 l;
	60
	61	l = __raw_readl(port->base + GPIO_IMR);
	62	l = (l & (~(1 << index))) \| (!!enable << index);
	63	__raw_writel(l, port->base + GPIO_IMR);
	64	}
	65
	66	static void gpio_ack_irq(u32 irq)
	67	{
	68	u32 gpio = irq_to_gpio(irq);
	69	_clear_gpio_irqstatus(&mxc_gpio_ports[gpio / 32], gpio & 0x1f);
	70	}
	71
	72	static void gpio_mask_irq(u32 irq)
	73	{
	74	u32 gpio = irq_to_gpio(irq);
	75	_set_gpio_irqenable(&mxc_gpio_ports[gpio / 32], gpio & 0x1f, 0);
	76	}
	77
	78	static void gpio_unmask_irq(u32 irq)
	79	{
	80	u32 gpio = irq_to_gpio(irq);
	81	_set_gpio_irqenable(&mxc_gpio_ports[gpio / 32], gpio & 0x1f, 1);
	82	}
	83
910862ec GL	84	static int mxc_gpio_get(struct gpio_chip *chip, unsigned offset);
910862ec GL	85
07bd1a6c JB	86	static int gpio_set_irq_type(u32 irq, u32 type)
	87	{
	88	u32 gpio = irq_to_gpio(irq);
	89	struct mxc_gpio_port *port = &mxc_gpio_ports[gpio / 32];
	90	u32 bit, val;
	91	int edge;
	92	void __iomem *reg = port->base;
	93
910862ec	94	port->both_edges &= ~(1 << (gpio & 31));
07bd1a6c	95	switch (type) {
6cab4860	96	case IRQ_TYPE_EDGE_RISING:
07bd1a6c JB	97	edge = GPIO_INT_RISE_EDGE;
07bd1a6c JB	98	break;
6cab4860	99	case IRQ_TYPE_EDGE_FALLING:
07bd1a6c JB	100	edge = GPIO_INT_FALL_EDGE;
07bd1a6c JB	101	break;
910862ec GL	102	case IRQ_TYPE_EDGE_BOTH:
	103	val = mxc_gpio_get(&port->chip, gpio & 31);
	104	if (val) {
	105	edge = GPIO_INT_LOW_LEV;
	106	pr_debug("mxc: set GPIO %d to low trigger\n", gpio);
	107	} else {
	108	edge = GPIO_INT_HIGH_LEV;
	109	pr_debug("mxc: set GPIO %d to high trigger\n", gpio);
	110	}
	111	port->both_edges \|= 1 << (gpio & 31);
	112	break;
6cab4860	113	case IRQ_TYPE_LEVEL_LOW:
07bd1a6c JB	114	edge = GPIO_INT_LOW_LEV;
07bd1a6c JB	115	break;
6cab4860	116	case IRQ_TYPE_LEVEL_HIGH:
07bd1a6c JB	117	edge = GPIO_INT_HIGH_LEV;
07bd1a6c JB	118	break;
910862ec	119	default:
07bd1a6c JB	120	return -EINVAL;
	121	}
	122
	123	reg += GPIO_ICR1 + ((gpio & 0x10) >> 2); /* lower or upper register */
	124	bit = gpio & 0xf;
	125	val = __raw_readl(reg) & ~(0x3 << (bit << 1));
	126	__raw_writel(val \| (edge << (bit << 1)), reg);
	127	_clear_gpio_irqstatus(port, gpio & 0x1f);
	128
	129	return 0;
	130	}
	131
910862ec GL	132	static void mxc_flip_edge(struct mxc_gpio_port *port, u32 gpio)
	133	{
	134	void __iomem *reg = port->base;
	135	u32 bit, val;
	136	int edge;
	137
	138	reg += GPIO_ICR1 + ((gpio & 0x10) >> 2); /* lower or upper register */
	139	bit = gpio & 0xf;
	140	val = __raw_readl(reg);
	141	edge = (val >> (bit << 1)) & 3;
	142	val &= ~(0x3 << (bit << 1));
	143	switch (edge) {
	144	case GPIO_INT_HIGH_LEV:
	145	edge = GPIO_INT_LOW_LEV;
	146	pr_debug("mxc: switch GPIO %d to low trigger\n", gpio);
	147	break;
	148	case GPIO_INT_LOW_LEV:
	149	edge = GPIO_INT_HIGH_LEV;
	150	pr_debug("mxc: switch GPIO %d to high trigger\n", gpio);
	151	break;
	152	default:
	153	pr_err("mxc: invalid configuration for GPIO %d: %x\n",
	154	gpio, edge);
	155	return;
	156	}
	157	__raw_writel(val \| (edge << (bit << 1)), reg);
	158	}
	159
07bd1a6c JB	160	/* handle n interrupts in one status register */
	161	static void mxc_gpio_irq_handler(struct mxc_gpio_port *port, u32 irq_stat)
	162	{
	163	u32 gpio_irq_no;
	164
	165	gpio_irq_no = port->virtual_irq_start;
	166	for (; irq_stat != 0; irq_stat >>= 1, gpio_irq_no++) {
910862ec	167	u32 gpio = irq_to_gpio(gpio_irq_no);
07bd1a6c JB	168
	169	if ((irq_stat & 1) == 0)
	170	continue;
	171
	172	BUG_ON(!(irq_desc[gpio_irq_no].handle_irq));
910862ec GL	173
	174	if (port->both_edges & (1 << (gpio & 31)))
	175	mxc_flip_edge(port, gpio);
	176
07bd1a6c JB	177	irq_desc[gpio_irq_no].handle_irq(gpio_irq_no,
	178	&irq_desc[gpio_irq_no]);
	179	}
	180	}
	181
cfca8b53	182	/* MX1 and MX3 has one interrupt per gpio port */
07bd1a6c JB	183	static void mx3_gpio_irq_handler(u32 irq, struct irq_desc *desc)
	184	{
	185	u32 irq_stat;
	186	struct mxc_gpio_port port = (struct mxc_gpio_port )get_irq_data(irq);
	187
	188	irq_stat = __raw_readl(port->base + GPIO_ISR) &
	189	__raw_readl(port->base + GPIO_IMR);
e2c97e7f	190
07bd1a6c JB	191	mxc_gpio_irq_handler(port, irq_stat);
07bd1a6c JB	192	}
07bd1a6c	193
07bd1a6c JB	194	/* MX2 has one interrupt for all gpio ports */
	195	static void mx2_gpio_irq_handler(u32 irq, struct irq_desc *desc)
	196	{
	197	int i;
	198	u32 irq_msk, irq_stat;
	199	struct mxc_gpio_port port = (struct mxc_gpio_port )get_irq_data(irq);
	200
	201	/* walk through all interrupt status registers */
	202	for (i = 0; i < gpio_table_size; i++) {
	203	irq_msk = __raw_readl(port[i].base + GPIO_IMR);
	204	if (!irq_msk)
	205	continue;
	206
	207	irq_stat = __raw_readl(port[i].base + GPIO_ISR) & irq_msk;
	208	if (irq_stat)
	209	mxc_gpio_irq_handler(&port[i], irq_stat);
	210	}
	211	}
07bd1a6c JB	212
	213	static struct irq_chip gpio_irq_chip = {
	214	.ack = gpio_ack_irq,
	215	.mask = gpio_mask_irq,
	216	.unmask = gpio_unmask_irq,
	217	.set_type = gpio_set_irq_type,
	218	};
	219
	220	static void _set_gpio_direction(struct gpio_chip *chip, unsigned offset,
	221	int dir)
	222	{
	223	struct mxc_gpio_port *port =
	224	container_of(chip, struct mxc_gpio_port, chip);
	225	u32 l;
	226
	227	l = __raw_readl(port->base + GPIO_GDIR);
	228	if (dir)
	229	l \|= 1 << offset;
	230	else
	231	l &= ~(1 << offset);
	232	__raw_writel(l, port->base + GPIO_GDIR);
	233	}
	234
	235	static void mxc_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
	236	{
	237	struct mxc_gpio_port *port =
	238	container_of(chip, struct mxc_gpio_port, chip);
	239	void __iomem *reg = port->base + GPIO_DR;
	240	u32 l;
	241
	242	l = (__raw_readl(reg) & (~(1 << offset))) \| (value << offset);
	243	__raw_writel(l, reg);
	244	}
	245
	246	static int mxc_gpio_get(struct gpio_chip *chip, unsigned offset)
	247	{
	248	struct mxc_gpio_port *port =
	249	container_of(chip, struct mxc_gpio_port, chip);
	250
5cac9d65	251	return (__raw_readl(port->base + GPIO_PSR) >> offset) & 1;
07bd1a6c JB	252	}
	253
	254	static int mxc_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
	255	{
	256	_set_gpio_direction(chip, offset, 0);
	257	return 0;
	258	}
	259
	260	static int mxc_gpio_direction_output(struct gpio_chip *chip,
	261	unsigned offset, int value)
	262	{
07bd1a6c	263	mxc_gpio_set(chip, offset, value);
999981d9	264	_set_gpio_direction(chip, offset, 1);
07bd1a6c JB	265	return 0;
	266	}
	267
	268	int __init mxc_gpio_init(struct mxc_gpio_port *port, int cnt)
	269	{
	270	int i, j;
	271
	272	/* save for local usage */
	273	mxc_gpio_ports = port;
	274	gpio_table_size = cnt;
	275
	276	printk(KERN_INFO "MXC GPIO hardware\n");
	277
	278	for (i = 0; i < cnt; i++) {
	279	/* disable the interrupt and clear the status */
	280	__raw_writel(0, port[i].base + GPIO_IMR);
	281	__raw_writel(~0, port[i].base + GPIO_ISR);
	282	for (j = port[i].virtual_irq_start;
	283	j < port[i].virtual_irq_start + 32; j++) {
	284	set_irq_chip(j, &gpio_irq_chip);
	285	set_irq_handler(j, handle_edge_irq);
	286	set_irq_flags(j, IRQF_VALID);
	287	}
	288
	289	/* register gpio chip */
	290	port[i].chip.direction_input = mxc_gpio_direction_input;
	291	port[i].chip.direction_output = mxc_gpio_direction_output;
	292	port[i].chip.get = mxc_gpio_get;
	293	port[i].chip.set = mxc_gpio_set;
	294	port[i].chip.base = i * 32;
	295	port[i].chip.ngpio = 32;
	296
	297	/* its a serious configuration bug when it fails */
	298	BUG_ON( gpiochip_add(&port[i].chip) < 0 );
	299
8c25c36f	300	if (cpu_is_mx1() \|\| cpu_is_mx3() \|\| cpu_is_mx25()) {
8afaada2 SH	301	/* setup one handler for each entry */
	302	set_irq_chained_handler(port[i].irq, mx3_gpio_irq_handler);
	303	set_irq_data(port[i].irq, &port[i]);
	304	}
	305	}
	306
	307	if (cpu_is_mx2()) {
	308	/* setup one handler for all GPIO interrupts */
	309	set_irq_chained_handler(port[0].irq, mx2_gpio_irq_handler);
	310	set_irq_data(port[0].irq, port);
07bd1a6c JB	311	}
07bd1a6c JB	312
07bd1a6c JB	313	return 0;
07bd1a6c JB	314	}