[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / gpio / gpio-ep93xx.c

/*
 * Generic EP93xx GPIO handling
 *
 * Copyright (c) 2008 Ryan Mallon
 * Copyright (c) 2011 H Hartley Sweeten <hsweeten@visionengravers.com>
 *
 * Based on code originally from:
 *  linux/arch/arm/mach-ep93xx/core.c
 *
 *  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/module.h>
#include <linux/platform_device.h>
#include <linux/io.h>
#include <linux/gpio.h>
#include <linux/irq.h>
#include <linux/slab.h>
#include <linux/basic_mmio_gpio.h>

#include <mach/hardware.h>
#include <mach/gpio-ep93xx.h>

#define irq_to_gpio(irq)	((irq) - gpio_to_irq(0))

struct ep93xx_gpio {
	void __iomem		*mmio_base;
	struct bgpio_chip	bgc[8];
};

/*************************************************************************
 * Interrupt handling for EP93xx on-chip GPIOs
 *************************************************************************/
static unsigned char gpio_int_unmasked[3];
static unsigned char gpio_int_enabled[3];
static unsigned char gpio_int_type1[3];
static unsigned char gpio_int_type2[3];
static unsigned char gpio_int_debounce[3];

/* Port ordering is: A B F */
static const u8 int_type1_register_offset[3]	= { 0x90, 0xac, 0x4c };
static const u8 int_type2_register_offset[3]	= { 0x94, 0xb0, 0x50 };
static const u8 eoi_register_offset[3]		= { 0x98, 0xb4, 0x54 };
static const u8 int_en_register_offset[3]	= { 0x9c, 0xb8, 0x58 };
static const u8 int_debounce_register_offset[3]	= { 0xa8, 0xc4, 0x64 };

static void ep93xx_gpio_update_int_params(unsigned port)
{
	BUG_ON(port > 2);

	__raw_writeb(0, EP93XX_GPIO_REG(int_en_register_offset[port]));

	__raw_writeb(gpio_int_type2[port],
		EP93XX_GPIO_REG(int_type2_register_offset[port]));

	__raw_writeb(gpio_int_type1[port],
		EP93XX_GPIO_REG(int_type1_register_offset[port]));

	__raw_writeb(gpio_int_unmasked[port] & gpio_int_enabled[port],
		EP93XX_GPIO_REG(int_en_register_offset[port]));
}

static void ep93xx_gpio_int_debounce(unsigned int irq, bool enable)
{
	int line = irq_to_gpio(irq);
	int port = line >> 3;
	int port_mask = 1 << (line & 7);

	if (enable)
		gpio_int_debounce[port] |= port_mask;
	else
		gpio_int_debounce[port] &= ~port_mask;

	__raw_writeb(gpio_int_debounce[port],
		EP93XX_GPIO_REG(int_debounce_register_offset[port]));
}

static void ep93xx_gpio_ab_irq_handler(unsigned int irq, struct irq_desc *desc)
{
	unsigned char status;
	int i;

	status = __raw_readb(EP93XX_GPIO_A_INT_STATUS);
	for (i = 0; i < 8; i++) {
		if (status & (1 << i)) {
			int gpio_irq = gpio_to_irq(EP93XX_GPIO_LINE_A(0)) + i;
			generic_handle_irq(gpio_irq);
		}
	}

	status = __raw_readb(EP93XX_GPIO_B_INT_STATUS);
	for (i = 0; i < 8; i++) {
		if (status & (1 << i)) {
			int gpio_irq = gpio_to_irq(EP93XX_GPIO_LINE_B(0)) + i;
			generic_handle_irq(gpio_irq);
		}
	}
}

static void ep93xx_gpio_f_irq_handler(unsigned int irq, struct irq_desc *desc)
{
	/*
	 * map discontiguous hw irq range to continuous sw irq range:
	 *
	 *  IRQ_EP93XX_GPIO{0..7}MUX -> gpio_to_irq(EP93XX_GPIO_LINE_F({0..7})
	 */
	int port_f_idx = ((irq + 1) & 7) ^ 4; /* {19..22,47..50} -> {0..7} */
	int gpio_irq = gpio_to_irq(EP93XX_GPIO_LINE_F(0)) + port_f_idx;

	generic_handle_irq(gpio_irq);
}

static void ep93xx_gpio_irq_ack(struct irq_data *d)
{
	int line = irq_to_gpio(d->irq);
	int port = line >> 3;
	int port_mask = 1 << (line & 7);

	if (irqd_get_trigger_type(d) == IRQ_TYPE_EDGE_BOTH) {
		gpio_int_type2[port] ^= port_mask; /* switch edge direction */
		ep93xx_gpio_update_int_params(port);
	}

	__raw_writeb(port_mask, EP93XX_GPIO_REG(eoi_register_offset[port]));
}

static void ep93xx_gpio_irq_mask_ack(struct irq_data *d)
{
	int line = irq_to_gpio(d->irq);
	int port = line >> 3;
	int port_mask = 1 << (line & 7);

	if (irqd_get_trigger_type(d) == IRQ_TYPE_EDGE_BOTH)
		gpio_int_type2[port] ^= port_mask; /* switch edge direction */

	gpio_int_unmasked[port] &= ~port_mask;
	ep93xx_gpio_update_int_params(port);

	__raw_writeb(port_mask, EP93XX_GPIO_REG(eoi_register_offset[port]));
}

static void ep93xx_gpio_irq_mask(struct irq_data *d)
{
	int line = irq_to_gpio(d->irq);
	int port = line >> 3;

	gpio_int_unmasked[port] &= ~(1 << (line & 7));
	ep93xx_gpio_update_int_params(port);
}

static void ep93xx_gpio_irq_unmask(struct irq_data *d)
{
	int line = irq_to_gpio(d->irq);
	int port = line >> 3;

	gpio_int_unmasked[port] |= 1 << (line & 7);
	ep93xx_gpio_update_int_params(port);
}

/*
 * gpio_int_type1 controls whether the interrupt is level (0) or
 * edge (1) triggered, while gpio_int_type2 controls whether it
 * triggers on low/falling (0) or high/rising (1).
 */
static int ep93xx_gpio_irq_type(struct irq_data *d, unsigned int type)
{
	const int gpio = irq_to_gpio(d->irq);
	const int port = gpio >> 3;
	const int port_mask = 1 << (gpio & 7);
	irq_flow_handler_t handler;

	gpio_direction_input(gpio);

	switch (type) {
	case IRQ_TYPE_EDGE_RISING:
		gpio_int_type1[port] |= port_mask;
		gpio_int_type2[port] |= port_mask;
		handler = handle_edge_irq;
		break;
	case IRQ_TYPE_EDGE_FALLING:
		gpio_int_type1[port] |= port_mask;
		gpio_int_type2[port] &= ~port_mask;
		handler = handle_edge_irq;
		break;
	case IRQ_TYPE_LEVEL_HIGH:
		gpio_int_type1[port] &= ~port_mask;
		gpio_int_type2[port] |= port_mask;
		handler = handle_level_irq;
		break;
	case IRQ_TYPE_LEVEL_LOW:
		gpio_int_type1[port] &= ~port_mask;
		gpio_int_type2[port] &= ~port_mask;
		handler = handle_level_irq;
		break;
	case IRQ_TYPE_EDGE_BOTH:
		gpio_int_type1[port] |= port_mask;
		/* set initial polarity based on current input level */
		if (gpio_get_value(gpio))
			gpio_int_type2[port] &= ~port_mask; /* falling */
		else
			gpio_int_type2[port] |= port_mask; /* rising */
		handler = handle_edge_irq;
		break;
	default:
		return -EINVAL;
	}

	__irq_set_handler_locked(d->irq, handler);

	gpio_int_enabled[port] |= port_mask;

	ep93xx_gpio_update_int_params(port);

	return 0;
}

static struct irq_chip ep93xx_gpio_irq_chip = {
	.name		= "GPIO",
	.irq_ack	= ep93xx_gpio_irq_ack,
	.irq_mask_ack	= ep93xx_gpio_irq_mask_ack,
	.irq_mask	= ep93xx_gpio_irq_mask,
	.irq_unmask	= ep93xx_gpio_irq_unmask,
	.irq_set_type	= ep93xx_gpio_irq_type,
};

static void ep93xx_gpio_init_irq(void)
{
	int gpio_irq;

	for (gpio_irq = gpio_to_irq(0);
	     gpio_irq <= gpio_to_irq(EP93XX_GPIO_LINE_MAX_IRQ); ++gpio_irq) {
		irq_set_chip_and_handler(gpio_irq, &ep93xx_gpio_irq_chip,
					 handle_level_irq);
		set_irq_flags(gpio_irq, IRQF_VALID);
	}

	irq_set_chained_handler(IRQ_EP93XX_GPIO_AB,
				ep93xx_gpio_ab_irq_handler);
	irq_set_chained_handler(IRQ_EP93XX_GPIO0MUX,
				ep93xx_gpio_f_irq_handler);
	irq_set_chained_handler(IRQ_EP93XX_GPIO1MUX,
				ep93xx_gpio_f_irq_handler);
	irq_set_chained_handler(IRQ_EP93XX_GPIO2MUX,
				ep93xx_gpio_f_irq_handler);
	irq_set_chained_handler(IRQ_EP93XX_GPIO3MUX,
				ep93xx_gpio_f_irq_handler);
	irq_set_chained_handler(IRQ_EP93XX_GPIO4MUX,
				ep93xx_gpio_f_irq_handler);
	irq_set_chained_handler(IRQ_EP93XX_GPIO5MUX,
				ep93xx_gpio_f_irq_handler);
	irq_set_chained_handler(IRQ_EP93XX_GPIO6MUX,
				ep93xx_gpio_f_irq_handler);
	irq_set_chained_handler(IRQ_EP93XX_GPIO7MUX,
				ep93xx_gpio_f_irq_handler);
}


/*************************************************************************
 * gpiolib interface for EP93xx on-chip GPIOs
 *************************************************************************/
struct ep93xx_gpio_bank {
	const char	*label;
	int		data;
	int		dir;
	int		base;
	bool		has_debounce;
};

#define EP93XX_GPIO_BANK(_label, _data, _dir, _base, _debounce)	\
	{							\
		.label		= _label,			\
		.data		= _data,			\
		.dir		= _dir,				\
		.base		= _base,			\
		.has_debounce	= _debounce,			\
	}

static struct ep93xx_gpio_bank ep93xx_gpio_banks[] = {
	EP93XX_GPIO_BANK("A", 0x00, 0x10, 0, true),
	EP93XX_GPIO_BANK("B", 0x04, 0x14, 8, true),
	EP93XX_GPIO_BANK("C", 0x08, 0x18, 40, false),
	EP93XX_GPIO_BANK("D", 0x0c, 0x1c, 24, false),
	EP93XX_GPIO_BANK("E", 0x20, 0x24, 32, false),
	EP93XX_GPIO_BANK("F", 0x30, 0x34, 16, true),
	EP93XX_GPIO_BANK("G", 0x38, 0x3c, 48, false),
	EP93XX_GPIO_BANK("H", 0x40, 0x44, 56, false),
};

static int ep93xx_gpio_set_debounce(struct gpio_chip *chip,
				    unsigned offset, unsigned debounce)
{
	int gpio = chip->base + offset;
	int irq = gpio_to_irq(gpio);

	if (irq < 0)
		return -EINVAL;

	ep93xx_gpio_int_debounce(irq, debounce ? true : false);

	return 0;
}

/*
 * Map GPIO A0..A7  (0..7)  to irq 64..71,
 *          B0..B7  (7..15) to irq 72..79, and
 *          F0..F7 (16..24) to irq 80..87.
 */
static int ep93xx_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
{
	int gpio = chip->base + offset;

	if (gpio > EP93XX_GPIO_LINE_MAX_IRQ)
		return -EINVAL;

	return 64 + gpio;
}

static int ep93xx_gpio_add_bank(struct bgpio_chip *bgc, struct device *dev,
	void __iomem *mmio_base, struct ep93xx_gpio_bank *bank)
{
	void __iomem *data = mmio_base + bank->data;
	void __iomem *dir =  mmio_base + bank->dir;
	int err;

	err = bgpio_init(bgc, dev, 1, data, NULL, NULL, dir, NULL, 0);
	if (err)
		return err;

	bgc->gc.label = bank->label;
	bgc->gc.base = bank->base;

	if (bank->has_debounce) {
		bgc->gc.set_debounce = ep93xx_gpio_set_debounce;
		bgc->gc.to_irq = ep93xx_gpio_to_irq;
	}

	return gpiochip_add(&bgc->gc);
}

static int ep93xx_gpio_probe(struct platform_device *pdev)
{
	struct ep93xx_gpio *ep93xx_gpio;
	struct resource *res;
	void __iomem *mmio;
	int i;
	int ret;

	ep93xx_gpio = kzalloc(sizeof(*ep93xx_gpio), GFP_KERNEL);
	if (!ep93xx_gpio)
		return -ENOMEM;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!res) {
		ret = -ENXIO;
		goto exit_free;
	}

	if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
		ret = -EBUSY;
		goto exit_free;
	}

	mmio = ioremap(res->start, resource_size(res));
	if (!mmio) {
		ret = -ENXIO;
		goto exit_release;
	}
	ep93xx_gpio->mmio_base = mmio;

	for (i = 0; i < ARRAY_SIZE(ep93xx_gpio_banks); i++) {
		struct bgpio_chip *bgc = &ep93xx_gpio->bgc[i];
		struct ep93xx_gpio_bank *bank = &ep93xx_gpio_banks[i];

		if (ep93xx_gpio_add_bank(bgc, &pdev->dev, mmio, bank))
			dev_warn(&pdev->dev, "Unable to add gpio bank %s\n",
				bank->label);
	}

	ep93xx_gpio_init_irq();

	return 0;

exit_release:
	release_mem_region(res->start, resource_size(res));
exit_free:
	kfree(ep93xx_gpio);
	dev_info(&pdev->dev, "%s failed with errno %d\n", __func__, ret);
	return ret;
}

static struct platform_driver ep93xx_gpio_driver = {
	.driver		= {
		.name	= "gpio-ep93xx",
		.owner	= THIS_MODULE,
	},
	.probe		= ep93xx_gpio_probe,
};

static int __init ep93xx_gpio_init(void)
{
	return platform_driver_register(&ep93xx_gpio_driver);
}
postcore_initcall(ep93xx_gpio_init);

MODULE_AUTHOR("Ryan Mallon <ryan@bluewatersys.com> "
		"H Hartley Sweeten <hsweeten@visionengravers.com>");
MODULE_DESCRIPTION("EP93XX GPIO driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
b685004f	1	/*
b685004f RM	2	* Generic EP93xx GPIO handling
b685004f RM	3	*
1c5454ee	4	* Copyright (c) 2008 Ryan Mallon
1e4c8842	5	* Copyright (c) 2011 H Hartley Sweeten <hsweeten@visionengravers.com>
b685004f RM	6	*
	7	* Based on code originally from:
	8	* linux/arch/arm/mach-ep93xx/core.c
	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>
bb207ef1	16	#include <linux/module.h>
1e4c8842	17	#include <linux/platform_device.h>
fced80c7	18	#include <linux/io.h>
ddf4f3d9	19	#include <linux/gpio.h>
595c050d	20	#include <linux/irq.h>
1e4c8842 HS	21	#include <linux/slab.h>
1e4c8842 HS	22	#include <linux/basic_mmio_gpio.h>
b685004f	23
ddf4f3d9	24	#include <mach/hardware.h>
bd5f12a2 LW	25	#include <mach/gpio-ep93xx.h>
	26
	27	#define irq_to_gpio(irq) ((irq) - gpio_to_irq(0))
b685004f	28
1e4c8842 HS	29	struct ep93xx_gpio {
	30	void __iomem *mmio_base;
	31	struct bgpio_chip bgc[8];
	32	};
	33
d056ab78	34	/*************************************************************************
4742723c	35	* Interrupt handling for EP93xx on-chip GPIOs
d056ab78 HS	36	*************************************************************************/
	37	static unsigned char gpio_int_unmasked[3];
	38	static unsigned char gpio_int_enabled[3];
	39	static unsigned char gpio_int_type1[3];
	40	static unsigned char gpio_int_type2[3];
	41	static unsigned char gpio_int_debounce[3];
	42
	43	/* Port ordering is: A B F */
	44	static const u8 int_type1_register_offset[3] = { 0x90, 0xac, 0x4c };
	45	static const u8 int_type2_register_offset[3] = { 0x94, 0xb0, 0x50 };
	46	static const u8 eoi_register_offset[3] = { 0x98, 0xb4, 0x54 };
	47	static const u8 int_en_register_offset[3] = { 0x9c, 0xb8, 0x58 };
	48	static const u8 int_debounce_register_offset[3] = { 0xa8, 0xc4, 0x64 };
	49
4742723c	50	static void ep93xx_gpio_update_int_params(unsigned port)
d056ab78 HS	51	{
	52	BUG_ON(port > 2);
	53
	54	__raw_writeb(0, EP93XX_GPIO_REG(int_en_register_offset[port]));
	55
	56	__raw_writeb(gpio_int_type2[port],
	57	EP93XX_GPIO_REG(int_type2_register_offset[port]));
	58
	59	__raw_writeb(gpio_int_type1[port],
	60	EP93XX_GPIO_REG(int_type1_register_offset[port]));
	61
	62	__raw_writeb(gpio_int_unmasked[port] & gpio_int_enabled[port],
	63	EP93XX_GPIO_REG(int_en_register_offset[port]));
	64	}
	65
5d046af0	66	static void ep93xx_gpio_int_debounce(unsigned int irq, bool enable)
d056ab78 HS	67	{
	68	int line = irq_to_gpio(irq);
	69	int port = line >> 3;
	70	int port_mask = 1 << (line & 7);
	71
	72	if (enable)
	73	gpio_int_debounce[port] \|= port_mask;
	74	else
	75	gpio_int_debounce[port] &= ~port_mask;
	76
	77	__raw_writeb(gpio_int_debounce[port],
	78	EP93XX_GPIO_REG(int_debounce_register_offset[port]));
	79	}
d056ab78 HS	80
	81	static void ep93xx_gpio_ab_irq_handler(unsigned int irq, struct irq_desc *desc)
	82	{
	83	unsigned char status;
	84	int i;
	85
	86	status = __raw_readb(EP93XX_GPIO_A_INT_STATUS);
	87	for (i = 0; i < 8; i++) {
	88	if (status & (1 << i)) {
	89	int gpio_irq = gpio_to_irq(EP93XX_GPIO_LINE_A(0)) + i;
	90	generic_handle_irq(gpio_irq);
	91	}
	92	}
	93
	94	status = __raw_readb(EP93XX_GPIO_B_INT_STATUS);
	95	for (i = 0; i < 8; i++) {
	96	if (status & (1 << i)) {
	97	int gpio_irq = gpio_to_irq(EP93XX_GPIO_LINE_B(0)) + i;
	98	generic_handle_irq(gpio_irq);
	99	}
	100	}
	101	}
	102
	103	static void ep93xx_gpio_f_irq_handler(unsigned int irq, struct irq_desc *desc)
	104	{
	105	/*
25985edc	106	* map discontiguous hw irq range to continuous sw irq range:
d056ab78 HS	107	*
	108	* IRQ_EP93XX_GPIO{0..7}MUX -> gpio_to_irq(EP93XX_GPIO_LINE_F({0..7})
	109	*/
	110	int port_f_idx = ((irq + 1) & 7) ^ 4; /* {19..22,47..50} -> {0..7} */
	111	int gpio_irq = gpio_to_irq(EP93XX_GPIO_LINE_F(0)) + port_f_idx;
	112
	113	generic_handle_irq(gpio_irq);
	114	}
	115
c0afc916	116	static void ep93xx_gpio_irq_ack(struct irq_data *d)
d056ab78	117	{
c0afc916	118	int line = irq_to_gpio(d->irq);
d056ab78 HS	119	int port = line >> 3;
	120	int port_mask = 1 << (line & 7);
	121
d1735a2e	122	if (irqd_get_trigger_type(d) == IRQ_TYPE_EDGE_BOTH) {
d056ab78 HS	123	gpio_int_type2[port] ^= port_mask; /* switch edge direction */
	124	ep93xx_gpio_update_int_params(port);
	125	}
	126
	127	__raw_writeb(port_mask, EP93XX_GPIO_REG(eoi_register_offset[port]));
	128	}
	129
c0afc916	130	static void ep93xx_gpio_irq_mask_ack(struct irq_data *d)
d056ab78	131	{
c0afc916	132	int line = irq_to_gpio(d->irq);
d056ab78 HS	133	int port = line >> 3;
	134	int port_mask = 1 << (line & 7);
	135
d1735a2e	136	if (irqd_get_trigger_type(d) == IRQ_TYPE_EDGE_BOTH)
d056ab78 HS	137	gpio_int_type2[port] ^= port_mask; /* switch edge direction */
	138
	139	gpio_int_unmasked[port] &= ~port_mask;
	140	ep93xx_gpio_update_int_params(port);
	141
	142	__raw_writeb(port_mask, EP93XX_GPIO_REG(eoi_register_offset[port]));
	143	}
	144
c0afc916	145	static void ep93xx_gpio_irq_mask(struct irq_data *d)
d056ab78	146	{
c0afc916	147	int line = irq_to_gpio(d->irq);
d056ab78 HS	148	int port = line >> 3;
	149
	150	gpio_int_unmasked[port] &= ~(1 << (line & 7));
	151	ep93xx_gpio_update_int_params(port);
	152	}
	153
c0afc916	154	static void ep93xx_gpio_irq_unmask(struct irq_data *d)
d056ab78	155	{
c0afc916	156	int line = irq_to_gpio(d->irq);
d056ab78 HS	157	int port = line >> 3;
	158
	159	gpio_int_unmasked[port] \|= 1 << (line & 7);
	160	ep93xx_gpio_update_int_params(port);
	161	}
	162
	163	/*
	164	* gpio_int_type1 controls whether the interrupt is level (0) or
	165	* edge (1) triggered, while gpio_int_type2 controls whether it
	166	* triggers on low/falling (0) or high/rising (1).
	167	*/
c0afc916	168	static int ep93xx_gpio_irq_type(struct irq_data *d, unsigned int type)
d056ab78	169	{
c0afc916	170	const int gpio = irq_to_gpio(d->irq);
d056ab78 HS	171	const int port = gpio >> 3;
d056ab78 HS	172	const int port_mask = 1 << (gpio & 7);
d1735a2e	173	irq_flow_handler_t handler;
d056ab78 HS	174
	175	gpio_direction_input(gpio);
	176
	177	switch (type) {
	178	case IRQ_TYPE_EDGE_RISING:
	179	gpio_int_type1[port] \|= port_mask;
	180	gpio_int_type2[port] \|= port_mask;
d1735a2e	181	handler = handle_edge_irq;
d056ab78 HS	182	break;
	183	case IRQ_TYPE_EDGE_FALLING:
	184	gpio_int_type1[port] \|= port_mask;
	185	gpio_int_type2[port] &= ~port_mask;
d1735a2e	186	handler = handle_edge_irq;
d056ab78 HS	187	break;
	188	case IRQ_TYPE_LEVEL_HIGH:
	189	gpio_int_type1[port] &= ~port_mask;
	190	gpio_int_type2[port] \|= port_mask;
d1735a2e	191	handler = handle_level_irq;
d056ab78 HS	192	break;
	193	case IRQ_TYPE_LEVEL_LOW:
	194	gpio_int_type1[port] &= ~port_mask;
	195	gpio_int_type2[port] &= ~port_mask;
d1735a2e	196	handler = handle_level_irq;
d056ab78 HS	197	break;
	198	case IRQ_TYPE_EDGE_BOTH:
	199	gpio_int_type1[port] \|= port_mask;
	200	/* set initial polarity based on current input level */
	201	if (gpio_get_value(gpio))
	202	gpio_int_type2[port] &= ~port_mask; /* falling */
	203	else
	204	gpio_int_type2[port] \|= port_mask; /* rising */
d1735a2e	205	handler = handle_edge_irq;
d056ab78 HS	206	break;
d056ab78 HS	207	default:
d056ab78 HS	208	return -EINVAL;
	209	}
	210
d1735a2e	211	__irq_set_handler_locked(d->irq, handler);
d056ab78	212
d1735a2e	213	gpio_int_enabled[port] \|= port_mask;
d056ab78 HS	214
	215	ep93xx_gpio_update_int_params(port);
	216
	217	return 0;
	218	}
	219
	220	static struct irq_chip ep93xx_gpio_irq_chip = {
	221	.name = "GPIO",
c0afc916 LB	222	.irq_ack = ep93xx_gpio_irq_ack,
	223	.irq_mask_ack = ep93xx_gpio_irq_mask_ack,
	224	.irq_mask = ep93xx_gpio_irq_mask,
	225	.irq_unmask = ep93xx_gpio_irq_unmask,
	226	.irq_set_type = ep93xx_gpio_irq_type,
d056ab78 HS	227	};
d056ab78 HS	228
1e4c8842	229	static void ep93xx_gpio_init_irq(void)
d056ab78 HS	230	{
	231	int gpio_irq;
	232
	233	for (gpio_irq = gpio_to_irq(0);
	234	gpio_irq <= gpio_to_irq(EP93XX_GPIO_LINE_MAX_IRQ); ++gpio_irq) {
f38c02f3 TG	235	irq_set_chip_and_handler(gpio_irq, &ep93xx_gpio_irq_chip,
f38c02f3 TG	236	handle_level_irq);
d056ab78 HS	237	set_irq_flags(gpio_irq, IRQF_VALID);
	238	}
	239
6845664a TG	240	irq_set_chained_handler(IRQ_EP93XX_GPIO_AB,
	241	ep93xx_gpio_ab_irq_handler);
	242	irq_set_chained_handler(IRQ_EP93XX_GPIO0MUX,
	243	ep93xx_gpio_f_irq_handler);
	244	irq_set_chained_handler(IRQ_EP93XX_GPIO1MUX,
	245	ep93xx_gpio_f_irq_handler);
	246	irq_set_chained_handler(IRQ_EP93XX_GPIO2MUX,
	247	ep93xx_gpio_f_irq_handler);
	248	irq_set_chained_handler(IRQ_EP93XX_GPIO3MUX,
	249	ep93xx_gpio_f_irq_handler);
	250	irq_set_chained_handler(IRQ_EP93XX_GPIO4MUX,
	251	ep93xx_gpio_f_irq_handler);
	252	irq_set_chained_handler(IRQ_EP93XX_GPIO5MUX,
	253	ep93xx_gpio_f_irq_handler);
	254	irq_set_chained_handler(IRQ_EP93XX_GPIO6MUX,
	255	ep93xx_gpio_f_irq_handler);
	256	irq_set_chained_handler(IRQ_EP93XX_GPIO7MUX,
	257	ep93xx_gpio_f_irq_handler);
d056ab78 HS	258	}
	259
	260
	261	/*************************************************************************
	262	* gpiolib interface for EP93xx on-chip GPIOs
	263	*************************************************************************/
1e4c8842 HS	264	struct ep93xx_gpio_bank {
	265	const char *label;
	266	int data;
	267	int dir;
	268	int base;
	269	bool has_debounce;
b685004f RM	270	};
b685004f RM	271
1e4c8842 HS	272	#define EP93XX_GPIO_BANK(_label, _data, _dir, _base, _debounce) \
	273	{ \
	274	.label = _label, \
	275	.data = _data, \
	276	.dir = _dir, \
	277	.base = _base, \
	278	.has_debounce = _debounce, \
	279	}
b685004f	280
1e4c8842 HS	281	static struct ep93xx_gpio_bank ep93xx_gpio_banks[] = {
	282	EP93XX_GPIO_BANK("A", 0x00, 0x10, 0, true),
	283	EP93XX_GPIO_BANK("B", 0x04, 0x14, 8, true),
	284	EP93XX_GPIO_BANK("C", 0x08, 0x18, 40, false),
	285	EP93XX_GPIO_BANK("D", 0x0c, 0x1c, 24, false),
	286	EP93XX_GPIO_BANK("E", 0x20, 0x24, 32, false),
	287	EP93XX_GPIO_BANK("F", 0x30, 0x34, 16, true),
	288	EP93XX_GPIO_BANK("G", 0x38, 0x3c, 48, false),
	289	EP93XX_GPIO_BANK("H", 0x40, 0x44, 56, false),
	290	};
	291
	292	static int ep93xx_gpio_set_debounce(struct gpio_chip *chip,
	293	unsigned offset, unsigned debounce)
b685004f	294	{
1e4c8842 HS	295	int gpio = chip->base + offset;
1e4c8842 HS	296	int irq = gpio_to_irq(gpio);
b685004f	297
1e4c8842 HS	298	if (irq < 0)
	299	return -EINVAL;
	300
	301	ep93xx_gpio_int_debounce(irq, debounce ? true : false);
b685004f RM	302
	303	return 0;
	304	}
	305
257af9f9 LW	306	/*
	307	* Map GPIO A0..A7 (0..7) to irq 64..71,
	308	* B0..B7 (7..15) to irq 72..79, and
	309	* F0..F7 (16..24) to irq 80..87.
	310	*/
	311	static int ep93xx_gpio_to_irq(struct gpio_chip *chip, unsigned offset)
	312	{
	313	int gpio = chip->base + offset;
	314
	315	if (gpio > EP93XX_GPIO_LINE_MAX_IRQ)
	316	return -EINVAL;
	317
	318	return 64 + gpio;
	319	}
	320
1e4c8842 HS	321	static int ep93xx_gpio_add_bank(struct bgpio_chip bgc, struct device dev,
1e4c8842 HS	322	void __iomem mmio_base, struct ep93xx_gpio_bank bank)
b685004f	323	{
1e4c8842 HS	324	void __iomem *data = mmio_base + bank->data;
	325	void __iomem *dir = mmio_base + bank->dir;
	326	int err;
b685004f	327
3e11f7b8	328	err = bgpio_init(bgc, dev, 1, data, NULL, NULL, dir, NULL, 0);
1e4c8842 HS	329	if (err)
1e4c8842 HS	330	return err;
b685004f	331
1e4c8842 HS	332	bgc->gc.label = bank->label;
1e4c8842 HS	333	bgc->gc.base = bank->base;
b685004f	334
257af9f9	335	if (bank->has_debounce) {
1e4c8842	336	bgc->gc.set_debounce = ep93xx_gpio_set_debounce;
257af9f9 LW	337	bgc->gc.to_irq = ep93xx_gpio_to_irq;
257af9f9 LW	338	}
b685004f	339
1e4c8842	340	return gpiochip_add(&bgc->gc);
b685004f RM	341	}
b685004f RM	342
3836309d	343	static int ep93xx_gpio_probe(struct platform_device *pdev)
b685004f	344	{
1e4c8842 HS	345	struct ep93xx_gpio *ep93xx_gpio;
	346	struct resource *res;
	347	void __iomem *mmio;
	348	int i;
	349	int ret;
b685004f	350
1e4c8842 HS	351	ep93xx_gpio = kzalloc(sizeof(*ep93xx_gpio), GFP_KERNEL);
	352	if (!ep93xx_gpio)
	353	return -ENOMEM;
b685004f	354
1e4c8842 HS	355	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	356	if (!res) {
	357	ret = -ENXIO;
	358	goto exit_free;
	359	}
b685004f	360
1e4c8842 HS	361	if (!request_mem_region(res->start, resource_size(res), pdev->name)) {
	362	ret = -EBUSY;
	363	goto exit_free;
	364	}
5d046af0	365
1e4c8842 HS	366	mmio = ioremap(res->start, resource_size(res));
	367	if (!mmio) {
	368	ret = -ENXIO;
	369	goto exit_release;
	370	}
	371	ep93xx_gpio->mmio_base = mmio;
5d046af0	372
1e4c8842 HS	373	for (i = 0; i < ARRAY_SIZE(ep93xx_gpio_banks); i++) {
	374	struct bgpio_chip *bgc = &ep93xx_gpio->bgc[i];
	375	struct ep93xx_gpio_bank *bank = &ep93xx_gpio_banks[i];
5d046af0	376
1e4c8842 HS	377	if (ep93xx_gpio_add_bank(bgc, &pdev->dev, mmio, bank))
	378	dev_warn(&pdev->dev, "Unable to add gpio bank %s\n",
	379	bank->label);
b685004f RM	380	}
b685004f RM	381
1e4c8842	382	ep93xx_gpio_init_irq();
b685004f	383
1e4c8842	384	return 0;
b685004f	385
1e4c8842 HS	386	exit_release:
	387	release_mem_region(res->start, resource_size(res));
	388	exit_free:
	389	kfree(ep93xx_gpio);
	390	dev_info(&pdev->dev, "%s failed with errno %d\n", __func__, ret);
	391	return ret;
	392	}
fd015480	393
1e4c8842 HS	394	static struct platform_driver ep93xx_gpio_driver = {
	395	.driver = {
	396	.name = "gpio-ep93xx",
	397	.owner = THIS_MODULE,
	398	},
	399	.probe = ep93xx_gpio_probe,
	400	};
	401
	402	static int __init ep93xx_gpio_init(void)
	403	{
1e4c8842	404	return platform_driver_register(&ep93xx_gpio_driver);
b685004f	405	}
1e4c8842 HS	406	postcore_initcall(ep93xx_gpio_init);
	407
	408	MODULE_AUTHOR("Ryan Mallon <ryan@bluewatersys.com> "
	409	"H Hartley Sweeten <hsweeten@visionengravers.com>");
	410	MODULE_DESCRIPTION("EP93XX GPIO driver");
	411	MODULE_LICENSE("GPL");