5f3c909881
This patch implements gpiolib for the AR7 SoC. Signed-off-by: Florian Fainelli <florian@openwrt.org> To: linux-mips@linux-mips.org Patchwork: http://patchwork.linux-mips.org/patch/816/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
132 lines
3.4 KiB
C
132 lines
3.4 KiB
C
/*
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* Copyright (C) 2007 Felix Fietkau <nbd@openwrt.org>
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* Copyright (C) 2007 Eugene Konev <ejka@openwrt.org>
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* Copyright (C) 2009 Florian Fainelli <florian@openwrt.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/module.h>
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#include <linux/gpio.h>
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#include <asm/mach-ar7/gpio.h>
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struct ar7_gpio_chip {
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void __iomem *regs;
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struct gpio_chip chip;
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};
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static int ar7_gpio_get_value(struct gpio_chip *chip, unsigned gpio)
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{
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struct ar7_gpio_chip *gpch =
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container_of(chip, struct ar7_gpio_chip, chip);
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void __iomem *gpio_in = gpch->regs + AR7_GPIO_INPUT;
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return readl(gpio_in) & (1 << gpio);
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}
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static void ar7_gpio_set_value(struct gpio_chip *chip,
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unsigned gpio, int value)
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{
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struct ar7_gpio_chip *gpch =
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container_of(chip, struct ar7_gpio_chip, chip);
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void __iomem *gpio_out = gpch->regs + AR7_GPIO_OUTPUT;
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unsigned tmp;
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tmp = readl(gpio_out) & ~(1 << gpio);
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if (value)
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tmp |= 1 << gpio;
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writel(tmp, gpio_out);
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}
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static int ar7_gpio_direction_input(struct gpio_chip *chip, unsigned gpio)
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{
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struct ar7_gpio_chip *gpch =
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container_of(chip, struct ar7_gpio_chip, chip);
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void __iomem *gpio_dir = gpch->regs + AR7_GPIO_DIR;
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writel(readl(gpio_dir) | (1 << gpio), gpio_dir);
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return 0;
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}
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static int ar7_gpio_direction_output(struct gpio_chip *chip,
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unsigned gpio, int value)
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{
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struct ar7_gpio_chip *gpch =
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container_of(chip, struct ar7_gpio_chip, chip);
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void __iomem *gpio_dir = gpch->regs + AR7_GPIO_DIR;
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ar7_gpio_set_value(chip, gpio, value);
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writel(readl(gpio_dir) & ~(1 << gpio), gpio_dir);
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return 0;
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}
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static struct ar7_gpio_chip ar7_gpio_chip = {
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.chip = {
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.label = "ar7-gpio",
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.direction_input = ar7_gpio_direction_input,
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.direction_output = ar7_gpio_direction_output,
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.set = ar7_gpio_set_value,
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.get = ar7_gpio_get_value,
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.base = 0,
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.ngpio = AR7_GPIO_MAX,
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}
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};
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int ar7_gpio_enable(unsigned gpio)
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{
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void __iomem *gpio_en = ar7_gpio_chip.regs + AR7_GPIO_ENABLE;
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writel(readl(gpio_en) | (1 << gpio), gpio_en);
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return 0;
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}
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EXPORT_SYMBOL(ar7_gpio_enable);
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int ar7_gpio_disable(unsigned gpio)
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{
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void __iomem *gpio_en = ar7_gpio_chip.regs + AR7_GPIO_ENABLE;
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writel(readl(gpio_en) & ~(1 << gpio), gpio_en);
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return 0;
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}
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EXPORT_SYMBOL(ar7_gpio_disable);
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static int __init ar7_gpio_init(void)
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{
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int ret;
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ar7_gpio_chip.regs = ioremap_nocache(AR7_REGS_GPIO,
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AR7_REGS_GPIO + 0x10);
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if (!ar7_gpio_chip.regs) {
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printk(KERN_ERR "ar7-gpio: failed to ioremap regs\n");
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return -ENOMEM;
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}
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ret = gpiochip_add(&ar7_gpio_chip.chip);
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if (ret) {
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printk(KERN_ERR "ar7-gpio: failed to add gpiochip\n");
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return ret;
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}
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printk(KERN_INFO "ar7-gpio: registered %d GPIOs\n",
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ar7_gpio_chip.chip.ngpio);
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return ret;
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}
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arch_initcall(ar7_gpio_init);
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