Gabor Juhos | 6eae43c | 2011-01-04 21:28:15 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Atheros AR71XX/AR724X/AR913X GPIO API support |
| 3 | * |
| 4 | * Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org> |
| 5 | * Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify it |
| 8 | * under the terms of the GNU General Public License version 2 as published |
| 9 | * by the Free Software Foundation. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/kernel.h> |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/types.h> |
| 16 | #include <linux/spinlock.h> |
| 17 | #include <linux/io.h> |
| 18 | #include <linux/ioport.h> |
| 19 | #include <linux/gpio.h> |
| 20 | |
| 21 | #include <asm/mach-ath79/ar71xx_regs.h> |
| 22 | #include <asm/mach-ath79/ath79.h> |
| 23 | #include "common.h" |
| 24 | |
| 25 | static void __iomem *ath79_gpio_base; |
| 26 | static unsigned long ath79_gpio_count; |
| 27 | static DEFINE_SPINLOCK(ath79_gpio_lock); |
| 28 | |
| 29 | static void __ath79_gpio_set_value(unsigned gpio, int value) |
| 30 | { |
| 31 | void __iomem *base = ath79_gpio_base; |
| 32 | |
| 33 | if (value) |
| 34 | __raw_writel(1 << gpio, base + AR71XX_GPIO_REG_SET); |
| 35 | else |
| 36 | __raw_writel(1 << gpio, base + AR71XX_GPIO_REG_CLEAR); |
| 37 | } |
| 38 | |
| 39 | static int __ath79_gpio_get_value(unsigned gpio) |
| 40 | { |
| 41 | return (__raw_readl(ath79_gpio_base + AR71XX_GPIO_REG_IN) >> gpio) & 1; |
| 42 | } |
| 43 | |
| 44 | static int ath79_gpio_get_value(struct gpio_chip *chip, unsigned offset) |
| 45 | { |
| 46 | return __ath79_gpio_get_value(offset); |
| 47 | } |
| 48 | |
| 49 | static void ath79_gpio_set_value(struct gpio_chip *chip, |
| 50 | unsigned offset, int value) |
| 51 | { |
| 52 | __ath79_gpio_set_value(offset, value); |
| 53 | } |
| 54 | |
| 55 | static int ath79_gpio_direction_input(struct gpio_chip *chip, |
| 56 | unsigned offset) |
| 57 | { |
| 58 | void __iomem *base = ath79_gpio_base; |
| 59 | unsigned long flags; |
| 60 | |
| 61 | spin_lock_irqsave(&ath79_gpio_lock, flags); |
| 62 | |
| 63 | __raw_writel(__raw_readl(base + AR71XX_GPIO_REG_OE) & ~(1 << offset), |
| 64 | base + AR71XX_GPIO_REG_OE); |
| 65 | |
| 66 | spin_unlock_irqrestore(&ath79_gpio_lock, flags); |
| 67 | |
| 68 | return 0; |
| 69 | } |
| 70 | |
| 71 | static int ath79_gpio_direction_output(struct gpio_chip *chip, |
| 72 | unsigned offset, int value) |
| 73 | { |
| 74 | void __iomem *base = ath79_gpio_base; |
| 75 | unsigned long flags; |
| 76 | |
| 77 | spin_lock_irqsave(&ath79_gpio_lock, flags); |
| 78 | |
| 79 | if (value) |
| 80 | __raw_writel(1 << offset, base + AR71XX_GPIO_REG_SET); |
| 81 | else |
| 82 | __raw_writel(1 << offset, base + AR71XX_GPIO_REG_CLEAR); |
| 83 | |
| 84 | __raw_writel(__raw_readl(base + AR71XX_GPIO_REG_OE) | (1 << offset), |
| 85 | base + AR71XX_GPIO_REG_OE); |
| 86 | |
| 87 | spin_unlock_irqrestore(&ath79_gpio_lock, flags); |
| 88 | |
| 89 | return 0; |
| 90 | } |
| 91 | |
| 92 | static struct gpio_chip ath79_gpio_chip = { |
| 93 | .label = "ath79", |
| 94 | .get = ath79_gpio_get_value, |
| 95 | .set = ath79_gpio_set_value, |
| 96 | .direction_input = ath79_gpio_direction_input, |
| 97 | .direction_output = ath79_gpio_direction_output, |
| 98 | .base = 0, |
| 99 | }; |
| 100 | |
| 101 | void ath79_gpio_function_enable(u32 mask) |
| 102 | { |
| 103 | void __iomem *base = ath79_gpio_base; |
| 104 | unsigned long flags; |
| 105 | |
| 106 | spin_lock_irqsave(&ath79_gpio_lock, flags); |
| 107 | |
| 108 | __raw_writel(__raw_readl(base + AR71XX_GPIO_REG_FUNC) | mask, |
| 109 | base + AR71XX_GPIO_REG_FUNC); |
| 110 | /* flush write */ |
| 111 | __raw_readl(base + AR71XX_GPIO_REG_FUNC); |
| 112 | |
| 113 | spin_unlock_irqrestore(&ath79_gpio_lock, flags); |
| 114 | } |
| 115 | |
| 116 | void ath79_gpio_function_disable(u32 mask) |
| 117 | { |
| 118 | void __iomem *base = ath79_gpio_base; |
| 119 | unsigned long flags; |
| 120 | |
| 121 | spin_lock_irqsave(&ath79_gpio_lock, flags); |
| 122 | |
| 123 | __raw_writel(__raw_readl(base + AR71XX_GPIO_REG_FUNC) & ~mask, |
| 124 | base + AR71XX_GPIO_REG_FUNC); |
| 125 | /* flush write */ |
| 126 | __raw_readl(base + AR71XX_GPIO_REG_FUNC); |
| 127 | |
| 128 | spin_unlock_irqrestore(&ath79_gpio_lock, flags); |
| 129 | } |
| 130 | |
| 131 | void ath79_gpio_function_setup(u32 set, u32 clear) |
| 132 | { |
| 133 | void __iomem *base = ath79_gpio_base; |
| 134 | unsigned long flags; |
| 135 | |
| 136 | spin_lock_irqsave(&ath79_gpio_lock, flags); |
| 137 | |
| 138 | __raw_writel((__raw_readl(base + AR71XX_GPIO_REG_FUNC) & ~clear) | set, |
| 139 | base + AR71XX_GPIO_REG_FUNC); |
| 140 | /* flush write */ |
| 141 | __raw_readl(base + AR71XX_GPIO_REG_FUNC); |
| 142 | |
| 143 | spin_unlock_irqrestore(&ath79_gpio_lock, flags); |
| 144 | } |
| 145 | |
| 146 | void __init ath79_gpio_init(void) |
| 147 | { |
| 148 | int err; |
| 149 | |
| 150 | if (soc_is_ar71xx()) |
| 151 | ath79_gpio_count = AR71XX_GPIO_COUNT; |
| 152 | else if (soc_is_ar724x()) |
| 153 | ath79_gpio_count = AR724X_GPIO_COUNT; |
| 154 | else if (soc_is_ar913x()) |
| 155 | ath79_gpio_count = AR913X_GPIO_COUNT; |
| 156 | else |
| 157 | BUG(); |
| 158 | |
| 159 | ath79_gpio_base = ioremap_nocache(AR71XX_GPIO_BASE, AR71XX_GPIO_SIZE); |
| 160 | ath79_gpio_chip.ngpio = ath79_gpio_count; |
| 161 | |
| 162 | err = gpiochip_add(&ath79_gpio_chip); |
| 163 | if (err) |
| 164 | panic("cannot add AR71xx GPIO chip, error=%d", err); |
| 165 | } |
| 166 | |
| 167 | int gpio_get_value(unsigned gpio) |
| 168 | { |
| 169 | if (gpio < ath79_gpio_count) |
| 170 | return __ath79_gpio_get_value(gpio); |
| 171 | |
| 172 | return __gpio_get_value(gpio); |
| 173 | } |
| 174 | EXPORT_SYMBOL(gpio_get_value); |
| 175 | |
| 176 | void gpio_set_value(unsigned gpio, int value) |
| 177 | { |
| 178 | if (gpio < ath79_gpio_count) |
| 179 | __ath79_gpio_set_value(gpio, value); |
| 180 | else |
| 181 | __gpio_set_value(gpio, value); |
| 182 | } |
| 183 | EXPORT_SYMBOL(gpio_set_value); |
| 184 | |
| 185 | int gpio_to_irq(unsigned gpio) |
| 186 | { |
| 187 | /* FIXME */ |
| 188 | return -EINVAL; |
| 189 | } |
| 190 | EXPORT_SYMBOL(gpio_to_irq); |
| 191 | |
| 192 | int irq_to_gpio(unsigned irq) |
| 193 | { |
| 194 | /* FIXME */ |
| 195 | return -EINVAL; |
| 196 | } |
| 197 | EXPORT_SYMBOL(irq_to_gpio); |