[linux-2.6-block.git] / arch / arm / mach-ep93xx / gpio.c

/*
 * linux/arch/arm/mach-ep93xx/gpio.c
 *
 * Generic EP93xx GPIO handling
 *
 * Copyright (c) 2008 Ryan Mallon <ryan@bluewatersys.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/seq_file.h>

#include <asm/arch/ep93xx-regs.h>
#include <asm/io.h>
#include <asm/gpio.h>

struct ep93xx_gpio_chip {
	struct gpio_chip	chip;

	unsigned int		data_reg;
	unsigned int		data_dir_reg;
};

#define to_ep93xx_gpio_chip(c) container_of(c, struct ep93xx_gpio_chip, chip)

/* From core.c */
extern void ep93xx_gpio_int_mask(unsigned line);
extern void ep93xx_gpio_update_int_params(unsigned port);

static int ep93xx_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
{
	struct ep93xx_gpio_chip *ep93xx_chip = to_ep93xx_gpio_chip(chip);
	unsigned long flags;
	u8 v;

	local_irq_save(flags);
	v = __raw_readb(ep93xx_chip->data_dir_reg);
	v &= ~(1 << offset);
	__raw_writeb(v, ep93xx_chip->data_dir_reg);
	local_irq_restore(flags);

	return 0;
}

static int ep93xx_gpio_direction_output(struct gpio_chip *chip,
					unsigned offset, int val)
{
	struct ep93xx_gpio_chip *ep93xx_chip = to_ep93xx_gpio_chip(chip);
	unsigned long flags;
	int line;
	u8 v;

	local_irq_save(flags);

	/* Set the value */
	v = __raw_readb(ep93xx_chip->data_reg);
	if (val)
		v |= (1 << offset);
	else
		v &= ~(1 << offset);
	__raw_writeb(v, ep93xx_chip->data_reg);

	/* Drive as an output */
	line = chip->base + offset;
	if (line <= EP93XX_GPIO_LINE_MAX_IRQ) {
		/* Ports A/B/F */
		ep93xx_gpio_int_mask(line);
		ep93xx_gpio_update_int_params(line >> 3);
	}

	v = __raw_readb(ep93xx_chip->data_dir_reg);
	v |= (1 << offset);
	__raw_writeb(v, ep93xx_chip->data_dir_reg);

	local_irq_restore(flags);

	return 0;
}

static int ep93xx_gpio_get(struct gpio_chip *chip, unsigned offset)
{
	struct ep93xx_gpio_chip *ep93xx_chip = to_ep93xx_gpio_chip(chip);

	return !!(__raw_readb(ep93xx_chip->data_reg) & (1 << offset));
}

static void ep93xx_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
{
	struct ep93xx_gpio_chip *ep93xx_chip = to_ep93xx_gpio_chip(chip);
	unsigned long flags;
	u8 v;

	local_irq_save(flags);
	v = __raw_readb(ep93xx_chip->data_reg);
	if (val)
		v |= (1 << offset);
	else
		v &= ~(1 << offset);
	__raw_writeb(v, ep93xx_chip->data_reg);
	local_irq_restore(flags);
}

static void ep93xx_gpio_dbg_show(struct seq_file *s, struct gpio_chip *chip)
{
	struct ep93xx_gpio_chip *ep93xx_chip = to_ep93xx_gpio_chip(chip);
	u8 data_reg, data_dir_reg;
	int i;

	data_reg = __raw_readb(ep93xx_chip->data_reg);
	data_dir_reg = __raw_readb(ep93xx_chip->data_dir_reg);

	for (i = 0; i < chip->ngpio; i++)
		seq_printf(s, "GPIO %s%d: %s %s\n", chip->label, i,
			   (data_reg & (1 << i)) ? "set" : "clear",
			   (data_dir_reg & (1 << i)) ? "out" : "in");
}

#define EP93XX_GPIO_BANK(name, dr, ddr, base_gpio)			\
	{								\
		.chip = {						\
			.label		  = name,			\
			.direction_input  = ep93xx_gpio_direction_input, \
			.direction_output = ep93xx_gpio_direction_output, \
			.get		  = ep93xx_gpio_get,		\
			.set		  = ep93xx_gpio_set,		\
			.dbg_show	  = ep93xx_gpio_dbg_show,	\
			.base		  = base_gpio,			\
			.ngpio		  = 8,				\
		},							\
		.data_reg	= EP93XX_GPIO_REG(dr),			\
		.data_dir_reg	= EP93XX_GPIO_REG(ddr),			\
	}

static struct ep93xx_gpio_chip ep93xx_gpio_banks[] = {
	EP93XX_GPIO_BANK("A", 0x00, 0x10, 0),
	EP93XX_GPIO_BANK("B", 0x04, 0x14, 8),
	EP93XX_GPIO_BANK("C", 0x30, 0x34, 40),
	EP93XX_GPIO_BANK("D", 0x0c, 0x1c, 24),
	EP93XX_GPIO_BANK("E", 0x20, 0x24, 32),
	EP93XX_GPIO_BANK("F", 0x08, 0x18, 16),
	EP93XX_GPIO_BANK("G", 0x38, 0x3c, 48),
	EP93XX_GPIO_BANK("H", 0x40, 0x44, 56),
};

void __init ep93xx_gpio_init(void)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(ep93xx_gpio_banks); i++)
		gpiochip_add(&ep93xx_gpio_banks[i].chip);
}
Commit	Line	Data
b685004f RM	1	/*
	2	* linux/arch/arm/mach-ep93xx/gpio.c
	3	*
	4	* Generic EP93xx GPIO handling
	5	*
	6	* Copyright (c) 2008 Ryan Mallon <ryan@bluewatersys.com>
	7	*
	8	* Based on code originally from:
	9	* linux/arch/arm/mach-ep93xx/core.c
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License version 2 as
	13	* published by the Free Software Foundation.
	14	*/
	15
	16	#include <linux/init.h>
	17	#include <linux/module.h>
	18	#include <linux/seq_file.h>
	19
	20	#include <asm/arch/ep93xx-regs.h>
	21	#include <asm/io.h>
	22	#include <asm/gpio.h>
	23
	24	struct ep93xx_gpio_chip {
	25	struct gpio_chip chip;
	26
	27	unsigned int data_reg;
	28	unsigned int data_dir_reg;
	29	};
	30
	31	#define to_ep93xx_gpio_chip(c) container_of(c, struct ep93xx_gpio_chip, chip)
	32
	33	/* From core.c */
	34	extern void ep93xx_gpio_int_mask(unsigned line);
	35	extern void ep93xx_gpio_update_int_params(unsigned port);
	36
	37	static int ep93xx_gpio_direction_input(struct gpio_chip *chip, unsigned offset)
	38	{
	39	struct ep93xx_gpio_chip *ep93xx_chip = to_ep93xx_gpio_chip(chip);
	40	unsigned long flags;
	41	u8 v;
	42
	43	local_irq_save(flags);
	44	v = __raw_readb(ep93xx_chip->data_dir_reg);
	45	v &= ~(1 << offset);
	46	__raw_writeb(v, ep93xx_chip->data_dir_reg);
	47	local_irq_restore(flags);
	48
	49	return 0;
	50	}
	51
	52	static int ep93xx_gpio_direction_output(struct gpio_chip *chip,
	53	unsigned offset, int val)
	54	{
	55	struct ep93xx_gpio_chip *ep93xx_chip = to_ep93xx_gpio_chip(chip);
	56	unsigned long flags;
	57	int line;
	58	u8 v;
	59
	60	local_irq_save(flags);
	61
	62	/* Set the value */
	63	v = __raw_readb(ep93xx_chip->data_reg);
	64	if (val)
65	v \|= (1 << offset);
66	else
67	v &= ~(1 << offset);
68	__raw_writeb(v, ep93xx_chip->data_reg);
69
70	/* Drive as an output */
71	line = chip->base + offset;
72	if (line <= EP93XX_GPIO_LINE_MAX_IRQ) {
73	/* Ports A/B/F */
74	ep93xx_gpio_int_mask(line);
75	ep93xx_gpio_update_int_params(line >> 3);
76	}
77
78	v = __raw_readb(ep93xx_chip->data_dir_reg);
79	v \|= (1 << offset);
80	__raw_writeb(v, ep93xx_chip->data_dir_reg);
81
82	local_irq_restore(flags);
83
84	return 0;
85	}
86
87	static int ep93xx_gpio_get(struct gpio_chip *chip, unsigned offset)
88	{
89	struct ep93xx_gpio_chip *ep93xx_chip = to_ep93xx_gpio_chip(chip);
90
91	return !!(__raw_readb(ep93xx_chip->data_reg) & (1 << offset));
92	}
93
94	static void ep93xx_gpio_set(struct gpio_chip *chip, unsigned offset, int val)
95	{
96	struct ep93xx_gpio_chip *ep93xx_chip = to_ep93xx_gpio_chip(chip);
97	unsigned long flags;
98	u8 v;
99
100	local_irq_save(flags);
101	v = __raw_readb(ep93xx_chip->data_reg);
102	if (val)
103	v \|= (1 << offset);
104	else
105	v &= ~(1 << offset);
106	__raw_writeb(v, ep93xx_chip->data_reg);
107	local_irq_restore(flags);
108	}
109
110	static void ep93xx_gpio_dbg_show(struct seq_file s, struct gpio_chip chip)
111	{
112	struct ep93xx_gpio_chip *ep93xx_chip = to_ep93xx_gpio_chip(chip);
113	u8 data_reg, data_dir_reg;
114	int i;
115
116	data_reg = __raw_readb(ep93xx_chip->data_reg);
117	data_dir_reg = __raw_readb(ep93xx_chip->data_dir_reg);
118
119	for (i = 0; i < chip->ngpio; i++)
120	seq_printf(s, "GPIO %s%d: %s %s\n", chip->label, i,
121	(data_reg & (1 << i)) ? "set" : "clear",
122	(data_dir_reg & (1 << i)) ? "out" : "in");
123	}
124
125	#define EP93XX_GPIO_BANK(name, dr, ddr, base_gpio) \
126	{ \
127	.chip = { \
128	.label = name, \
129	.direction_input = ep93xx_gpio_direction_input, \
130	.direction_output = ep93xx_gpio_direction_output, \
131	.get = ep93xx_gpio_get, \
132	.set = ep93xx_gpio_set, \
133	.dbg_show = ep93xx_gpio_dbg_show, \
134	.base = base_gpio, \
135	.ngpio = 8, \
136	}, \
137	.data_reg = EP93XX_GPIO_REG(dr), \
138	.data_dir_reg = EP93XX_GPIO_REG(ddr), \
139	}
140
141	static struct ep93xx_gpio_chip ep93xx_gpio_banks[] = {
142	EP93XX_GPIO_BANK("A", 0x00, 0x10, 0),
143	EP93XX_GPIO_BANK("B", 0x04, 0x14, 8),
144	EP93XX_GPIO_BANK("C", 0x30, 0x34, 40),
145	EP93XX_GPIO_BANK("D", 0x0c, 0x1c, 24),
146	EP93XX_GPIO_BANK("E", 0x20, 0x24, 32),
147	EP93XX_GPIO_BANK("F", 0x08, 0x18, 16),
148	EP93XX_GPIO_BANK("G", 0x38, 0x3c, 48),
149	EP93XX_GPIO_BANK("H", 0x40, 0x44, 56),
150	};
151
152	void __init ep93xx_gpio_init(void)
153	{
154	int i;
155
156	for (i = 0; i < ARRAY_SIZE(ep93xx_gpio_banks); i++)
157	gpiochip_add(&ep93xx_gpio_banks[i].chip);
158	}