diff options
Diffstat (limited to 'arch/mips/ar7')
| -rw-r--r-- | arch/mips/ar7/gpio.c | 113 | ||||
| -rw-r--r-- | arch/mips/ar7/platform.c | 1 |
2 files changed, 99 insertions, 15 deletions
diff --git a/arch/mips/ar7/gpio.c b/arch/mips/ar7/gpio.c index 74e14a3..0e9f4e1 100644 --- a/arch/mips/ar7/gpio.c +++ b/arch/mips/ar7/gpio.c @@ -1,6 +1,7 @@ /* * 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 @@ -18,31 +19,113 @@ */ #include <linux/module.h> +#include <linux/gpio.h> #include <asm/mach-ar7/gpio.h> -static const char *ar7_gpio_list[AR7_GPIO_MAX]; +struct ar7_gpio_chip { + void __iomem *regs; + struct gpio_chip chip; +}; -int gpio_request(unsigned gpio, const char *label) +static int ar7_gpio_get_value(struct gpio_chip *chip, unsigned gpio) { - if (gpio >= AR7_GPIO_MAX) - return -EINVAL; + struct ar7_gpio_chip *gpch = + container_of(chip, struct ar7_gpio_chip, chip); + void __iomem *gpio_in = gpch->regs + AR7_GPIO_INPUT; - if (ar7_gpio_list[gpio]) - return -EBUSY; + 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; - if (label) - ar7_gpio_list[gpio] = label; - else - ar7_gpio_list[gpio] = "busy"; + writel(readl(gpio_dir) | (1 << gpio), gpio_dir); return 0; } -EXPORT_SYMBOL(gpio_request); -void gpio_free(unsigned gpio) +static int ar7_gpio_direction_output(struct gpio_chip *chip, + unsigned gpio, int value) { - BUG_ON(!ar7_gpio_list[gpio]); - ar7_gpio_list[gpio] = NULL; + 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; } -EXPORT_SYMBOL(gpio_free); +arch_initcall(ar7_gpio_init); diff --git a/arch/mips/ar7/platform.c b/arch/mips/ar7/platform.c index f70a10a..5a3fa94 100644 --- a/arch/mips/ar7/platform.c +++ b/arch/mips/ar7/platform.c @@ -34,6 +34,7 @@ #include <linux/etherdevice.h> #include <linux/phy.h> #include <linux/phy_fixed.h> +#include <linux/gpio.h> #include <asm/addrspace.h> #include <asm/mach-ar7/ar7.h> |