[deliverable/linux.git] / arch / mips / ar7 / gpio.c

/*
 * Copyright (C) 2007 Felix Fietkau <nbd@openwrt.org>
 * Copyright (C) 2007 Eugene Konev <ejka@openwrt.org>
 * Copyright (C) 2009 Florian Fainelli <florian@openwrt.org>
 *
 * 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 St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include <linux/module.h>
#include <linux/gpio.h>

#include <asm/mach-ar7/gpio.h>

struct ar7_gpio_chip {
	void __iomem	*regs;
	struct gpio_chip chip;
};

static int ar7_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
{
	struct ar7_gpio_chip *gpch =
				container_of(chip, struct ar7_gpio_chip, chip);
	void __iomem *gpio_in = gpch->regs + AR7_GPIO_INPUT;

	return readl(gpio_in) & (1 << gpio);
}

static void ar7_gpio_set_value(struct gpio_chip *chip,
				unsigned gpio, int value)
{
	struct ar7_gpio_chip *gpch =
				container_of(chip, struct ar7_gpio_chip, chip);
	void __iomem *gpio_out = gpch->regs + AR7_GPIO_OUTPUT;
	unsigned tmp;

	tmp = readl(gpio_out) & ~(1 << gpio);
	if (value)
		tmp |= 1 << gpio;
	writel(tmp, gpio_out);
}

static int ar7_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
{
	struct ar7_gpio_chip *gpch =
				container_of(chip, struct ar7_gpio_chip, chip);
	void __iomem *gpio_dir = gpch->regs + AR7_GPIO_DIR;

	writel(readl(gpio_dir) | (1 << gpio), gpio_dir);

	return 0;
}

static int ar7_gpio_direction_output(struct gpio_chip *chip,
					unsigned gpio, int value)
{
	struct ar7_gpio_chip *gpch =
				container_of(chip, struct ar7_gpio_chip, chip);
	void __iomem *gpio_dir = gpch->regs + AR7_GPIO_DIR;

	ar7_gpio_set_value(chip, gpio, value);
	writel(readl(gpio_dir) & ~(1 << gpio), gpio_dir);

	return 0;
}

static struct ar7_gpio_chip ar7_gpio_chip = {
	.chip = {
		.label		= "ar7-gpio",
		.direction_input	= ar7_gpio_direction_input,
		.direction_output	= ar7_gpio_direction_output,
		.set			= ar7_gpio_set_value,
		.get			= ar7_gpio_get_value,
		.base			= 0,
		.ngpio			= AR7_GPIO_MAX,
	}
};

int ar7_gpio_enable(unsigned gpio)
{
	void __iomem *gpio_en = ar7_gpio_chip.regs + AR7_GPIO_ENABLE;

	writel(readl(gpio_en) | (1 << gpio), gpio_en);

	return 0;
}
EXPORT_SYMBOL(ar7_gpio_enable);

int ar7_gpio_disable(unsigned gpio)
{
	void __iomem *gpio_en = ar7_gpio_chip.regs + AR7_GPIO_ENABLE;

	writel(readl(gpio_en) & ~(1 << gpio), gpio_en);

	return 0;
}
EXPORT_SYMBOL(ar7_gpio_disable);

static int __init ar7_gpio_init(void)
{
	int ret;

	ar7_gpio_chip.regs = ioremap_nocache(AR7_REGS_GPIO,
					AR7_REGS_GPIO + 0x10);

	if (!ar7_gpio_chip.regs) {
		printk(KERN_ERR "ar7-gpio: failed to ioremap regs\n");
		return -ENOMEM;
	}

	ret = gpiochip_add(&ar7_gpio_chip.chip);
	if (ret) {
		printk(KERN_ERR "ar7-gpio: failed to add gpiochip\n");
		return ret;
	}
	printk(KERN_INFO "ar7-gpio: registered %d GPIOs\n",
				ar7_gpio_chip.chip.ngpio);
	return ret;
}
arch_initcall(ar7_gpio_init);
Commit	Line	Data
7ca5dc14 FF	1	/*
	2	* Copyright (C) 2007 Felix Fietkau <nbd@openwrt.org>
	3	* Copyright (C) 2007 Eugene Konev <ejka@openwrt.org>
5f3c9098	4	* Copyright (C) 2009 Florian Fainelli <florian@openwrt.org>
7ca5dc14 FF	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 as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	19	*/
	20
	21	#include <linux/module.h>
5f3c9098	22	#include <linux/gpio.h>
7ca5dc14 FF	23
	24	#include <asm/mach-ar7/gpio.h>
	25
5f3c9098 FF	26	struct ar7_gpio_chip {
	27	void __iomem *regs;
	28	struct gpio_chip chip;
	29	};
7ca5dc14	30
5f3c9098	31	static int ar7_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
7ca5dc14	32	{
5f3c9098 FF	33	struct ar7_gpio_chip *gpch =
	34	container_of(chip, struct ar7_gpio_chip, chip);
	35	void __iomem *gpio_in = gpch->regs + AR7_GPIO_INPUT;
7ca5dc14	36
5f3c9098 FF	37	return readl(gpio_in) & (1 << gpio);
	38	}
	39
	40	static void ar7_gpio_set_value(struct gpio_chip *chip,
	41	unsigned gpio, int value)
	42	{
	43	struct ar7_gpio_chip *gpch =
	44	container_of(chip, struct ar7_gpio_chip, chip);
	45	void __iomem *gpio_out = gpch->regs + AR7_GPIO_OUTPUT;
	46	unsigned tmp;
	47
	48	tmp = readl(gpio_out) & ~(1 << gpio);
	49	if (value)
	50	tmp \|= 1 << gpio;
	51	writel(tmp, gpio_out);
	52	}
	53
	54	static int ar7_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
	55	{
	56	struct ar7_gpio_chip *gpch =
	57	container_of(chip, struct ar7_gpio_chip, chip);
	58	void __iomem *gpio_dir = gpch->regs + AR7_GPIO_DIR;
7ca5dc14	59
5f3c9098	60	writel(readl(gpio_dir) \| (1 << gpio), gpio_dir);
7ca5dc14 FF	61
	62	return 0;
	63	}
7ca5dc14	64
5f3c9098 FF	65	static int ar7_gpio_direction_output(struct gpio_chip *chip,
5f3c9098 FF	66	unsigned gpio, int value)
7ca5dc14	67	{
5f3c9098 FF	68	struct ar7_gpio_chip *gpch =
	69	container_of(chip, struct ar7_gpio_chip, chip);
	70	void __iomem *gpio_dir = gpch->regs + AR7_GPIO_DIR;
	71
	72	ar7_gpio_set_value(chip, gpio, value);
	73	writel(readl(gpio_dir) & ~(1 << gpio), gpio_dir);
	74
	75	return 0;
	76	}
	77
	78	static struct ar7_gpio_chip ar7_gpio_chip = {
	79	.chip = {
	80	.label = "ar7-gpio",
	81	.direction_input = ar7_gpio_direction_input,
	82	.direction_output = ar7_gpio_direction_output,
	83	.set = ar7_gpio_set_value,
	84	.get = ar7_gpio_get_value,
	85	.base = 0,
	86	.ngpio = AR7_GPIO_MAX,
	87	}
	88	};
	89
	90	int ar7_gpio_enable(unsigned gpio)
	91	{
	92	void __iomem *gpio_en = ar7_gpio_chip.regs + AR7_GPIO_ENABLE;
	93
	94	writel(readl(gpio_en) \| (1 << gpio), gpio_en);
	95
	96	return 0;
	97	}
	98	EXPORT_SYMBOL(ar7_gpio_enable);
	99
	100	int ar7_gpio_disable(unsigned gpio)
	101	{
	102	void __iomem *gpio_en = ar7_gpio_chip.regs + AR7_GPIO_ENABLE;
	103
	104	writel(readl(gpio_en) & ~(1 << gpio), gpio_en);
	105
	106	return 0;
	107	}
	108	EXPORT_SYMBOL(ar7_gpio_disable);
	109
	110	static int __init ar7_gpio_init(void)
	111	{
	112	int ret;
	113
	114	ar7_gpio_chip.regs = ioremap_nocache(AR7_REGS_GPIO,
	115	AR7_REGS_GPIO + 0x10);
	116
	117	if (!ar7_gpio_chip.regs) {
	118	printk(KERN_ERR "ar7-gpio: failed to ioremap regs\n");
	119	return -ENOMEM;
	120	}
	121
	122	ret = gpiochip_add(&ar7_gpio_chip.chip);
	123	if (ret) {
	124	printk(KERN_ERR "ar7-gpio: failed to add gpiochip\n");
	125	return ret;
	126	}
	127	printk(KERN_INFO "ar7-gpio: registered %d GPIOs\n",
	128	ar7_gpio_chip.chip.ngpio);
	129	return ret;
7ca5dc14	130	}
5f3c9098	131	arch_initcall(ar7_gpio_init);