| Maxime Bizon | e7300d0 | 2009-08-18 13:23:37 +0100 | [diff] [blame] | 1 | /* |
| 2 | * This file is subject to the terms and conditions of the GNU General Public |
| 3 | * License. See the file "COPYING" in the main directory of this archive |
| 4 | * for more details. |
| 5 | * |
| 6 | * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr> |
| 7 | * Copyright (C) 2008 Florian Fainelli <florian@openwrt.org> |
| 8 | */ |
| 9 | |
| 10 | #include <linux/kernel.h> |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/spinlock.h> |
| 13 | #include <linux/platform_device.h> |
| 14 | #include <linux/gpio.h> |
| 15 | |
| 16 | #include <bcm63xx_cpu.h> |
| 17 | #include <bcm63xx_gpio.h> |
| 18 | #include <bcm63xx_io.h> |
| 19 | #include <bcm63xx_regs.h> |
| 20 | |
| 21 | static DEFINE_SPINLOCK(bcm63xx_gpio_lock); |
| 22 | static u32 gpio_out_low, gpio_out_high; |
| 23 | |
| 24 | static void bcm63xx_gpio_set(struct gpio_chip *chip, |
| 25 | unsigned gpio, int val) |
| 26 | { |
| 27 | u32 reg; |
| 28 | u32 mask; |
| 29 | u32 *v; |
| 30 | unsigned long flags; |
| 31 | |
| 32 | if (gpio >= chip->ngpio) |
| 33 | BUG(); |
| 34 | |
| 35 | if (gpio < 32) { |
| 36 | reg = GPIO_DATA_LO_REG; |
| 37 | mask = 1 << gpio; |
| 38 | v = &gpio_out_low; |
| 39 | } else { |
| 40 | reg = GPIO_DATA_HI_REG; |
| 41 | mask = 1 << (gpio - 32); |
| 42 | v = &gpio_out_high; |
| 43 | } |
| 44 | |
| 45 | spin_lock_irqsave(&bcm63xx_gpio_lock, flags); |
| 46 | if (val) |
| 47 | *v |= mask; |
| 48 | else |
| 49 | *v &= ~mask; |
| 50 | bcm_gpio_writel(*v, reg); |
| 51 | spin_unlock_irqrestore(&bcm63xx_gpio_lock, flags); |
| 52 | } |
| 53 | |
| 54 | static int bcm63xx_gpio_get(struct gpio_chip *chip, unsigned gpio) |
| 55 | { |
| 56 | u32 reg; |
| 57 | u32 mask; |
| 58 | |
| 59 | if (gpio >= chip->ngpio) |
| 60 | BUG(); |
| 61 | |
| 62 | if (gpio < 32) { |
| 63 | reg = GPIO_DATA_LO_REG; |
| 64 | mask = 1 << gpio; |
| 65 | } else { |
| 66 | reg = GPIO_DATA_HI_REG; |
| 67 | mask = 1 << (gpio - 32); |
| 68 | } |
| 69 | |
| 70 | return !!(bcm_gpio_readl(reg) & mask); |
| 71 | } |
| 72 | |
| 73 | static int bcm63xx_gpio_set_direction(struct gpio_chip *chip, |
| 74 | unsigned gpio, int dir) |
| 75 | { |
| 76 | u32 reg; |
| 77 | u32 mask; |
| 78 | u32 tmp; |
| 79 | unsigned long flags; |
| 80 | |
| 81 | if (gpio >= chip->ngpio) |
| 82 | BUG(); |
| 83 | |
| 84 | if (gpio < 32) { |
| 85 | reg = GPIO_CTL_LO_REG; |
| 86 | mask = 1 << gpio; |
| 87 | } else { |
| 88 | reg = GPIO_CTL_HI_REG; |
| 89 | mask = 1 << (gpio - 32); |
| 90 | } |
| 91 | |
| 92 | spin_lock_irqsave(&bcm63xx_gpio_lock, flags); |
| 93 | tmp = bcm_gpio_readl(reg); |
| 94 | if (dir == GPIO_DIR_IN) |
| 95 | tmp &= ~mask; |
| 96 | else |
| 97 | tmp |= mask; |
| 98 | bcm_gpio_writel(tmp, reg); |
| 99 | spin_unlock_irqrestore(&bcm63xx_gpio_lock, flags); |
| 100 | |
| 101 | return 0; |
| 102 | } |
| 103 | |
| 104 | static int bcm63xx_gpio_direction_input(struct gpio_chip *chip, unsigned gpio) |
| 105 | { |
| 106 | return bcm63xx_gpio_set_direction(chip, gpio, GPIO_DIR_IN); |
| 107 | } |
| 108 | |
| 109 | static int bcm63xx_gpio_direction_output(struct gpio_chip *chip, |
| 110 | unsigned gpio, int value) |
| 111 | { |
| 112 | bcm63xx_gpio_set(chip, gpio, value); |
| 113 | return bcm63xx_gpio_set_direction(chip, gpio, GPIO_DIR_OUT); |
| 114 | } |
| 115 | |
| 116 | |
| 117 | static struct gpio_chip bcm63xx_gpio_chip = { |
| 118 | .label = "bcm63xx-gpio", |
| 119 | .direction_input = bcm63xx_gpio_direction_input, |
| 120 | .direction_output = bcm63xx_gpio_direction_output, |
| 121 | .get = bcm63xx_gpio_get, |
| 122 | .set = bcm63xx_gpio_set, |
| 123 | .base = 0, |
| 124 | }; |
| 125 | |
| 126 | int __init bcm63xx_gpio_init(void) |
| 127 | { |
| 128 | bcm63xx_gpio_chip.ngpio = bcm63xx_gpio_count(); |
| 129 | pr_info("registering %d GPIOs\n", bcm63xx_gpio_chip.ngpio); |
| 130 | |
| 131 | return gpiochip_add(&bcm63xx_gpio_chip); |
| 132 | } |
| 133 | |
| 134 | arch_initcall(bcm63xx_gpio_init); |