forked from Minki/linux
4d1da8c296
[Ralf: Fixed up reject and Wu's complaints about comment style.] Signed-off-by: Alexander Clouter <alex@digriz.org.uk> To: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/921/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
132 lines
3.4 KiB
C
132 lines
3.4 KiB
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);
|