projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| e7300d04 MB |
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> | |
| 92d9ae20 | 7 | * Copyright (C) 2008-2011 Florian Fainelli <florian@openwrt.org> |
| e7300d04 MB |
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 | ||
| 92d9ae20 FF |
21 | #ifndef BCMCPU_RUNTIME_DETECT |
| 22 | #define gpio_out_low_reg GPIO_DATA_LO_REG | |
| 23 | #ifdef CONFIG_BCM63XX_CPU_6345 | |
| 24 | #ifdef gpio_out_low_reg | |
| 25 | #undef gpio_out_low_reg | |
| 26 | #define gpio_out_low_reg GPIO_DATA_LO_REG_6345 | |
| 27 | #endif /* gpio_out_low_reg */ | |
| 28 | #endif /* CONFIG_BCM63XX_CPU_6345 */ | |
| 29 | ||
| 30 | static inline void bcm63xx_gpio_out_low_reg_init(void) | |
| 31 | { | |
| 32 | } | |
| 33 | #else /* ! BCMCPU_RUNTIME_DETECT */ | |
| 34 | static u32 gpio_out_low_reg; | |
| 35 | ||
| 36 | static void bcm63xx_gpio_out_low_reg_init(void) | |
| 37 | { | |
| 38 | switch (bcm63xx_get_cpu_id()) { | |
| 39 | case BCM6345_CPU_ID: | |
| 40 | gpio_out_low_reg = GPIO_DATA_LO_REG_6345; | |
| 41 | break; | |
| 42 | default: | |
| 43 | gpio_out_low_reg = GPIO_DATA_LO_REG; | |
| 44 | break; | |
| 45 | } | |
| 46 | } | |
| 47 | #endif /* ! BCMCPU_RUNTIME_DETECT */ | |
| 48 | ||
| e7300d04 MB |
49 | static DEFINE_SPINLOCK(bcm63xx_gpio_lock); |
| 50 | static u32 gpio_out_low, gpio_out_high; | |
| 51 | ||
| 52 | static void bcm63xx_gpio_set(struct gpio_chip *chip, | |
| 53 | unsigned gpio, int val) | |
| 54 | { | |
| 55 | u32 reg; | |
| 56 | u32 mask; | |
| 57 | u32 *v; | |
| 58 | unsigned long flags; | |
| 59 | ||
| 60 | if (gpio >= chip->ngpio) | |
| 61 | BUG(); | |
| 62 | ||
| 63 | if (gpio < 32) { | |
| 92d9ae20 | 64 | reg = gpio_out_low_reg; |
| e7300d04 MB |
65 | mask = 1 << gpio; |
| 66 | v = &gpio_out_low; | |
| 67 | } else { | |
| 68 | reg = GPIO_DATA_HI_REG; | |
| 69 | mask = 1 << (gpio - 32); | |
| 70 | v = &gpio_out_high; | |
| 71 | } | |
| 72 | ||
| 73 | spin_lock_irqsave(&bcm63xx_gpio_lock, flags); | |
| 74 | if (val) | |
| 75 | *v |= mask; | |
| 76 | else | |
| 77 | *v &= ~mask; | |
| 78 | bcm_gpio_writel(*v, reg); | |
| 79 | spin_unlock_irqrestore(&bcm63xx_gpio_lock, flags); | |
| 80 | } | |
| 81 | ||
| 82 | static int bcm63xx_gpio_get(struct gpio_chip *chip, unsigned gpio) | |
| 83 | { | |
| 84 | u32 reg; | |
| 85 | u32 mask; | |
| 86 | ||
| 87 | if (gpio >= chip->ngpio) | |
| 88 | BUG(); | |
| 89 | ||
| 90 | if (gpio < 32) { | |
| 92d9ae20 | 91 | reg = gpio_out_low_reg; |
| e7300d04 MB |
92 | mask = 1 << gpio; |
| 93 | } else { | |
| 94 | reg = GPIO_DATA_HI_REG; | |
| 95 | mask = 1 << (gpio - 32); | |
| 96 | } | |
| 97 | ||
| 98 | return !!(bcm_gpio_readl(reg) & mask); | |
| 99 | } | |
| 100 | ||
| 101 | static int bcm63xx_gpio_set_direction(struct gpio_chip *chip, | |
| 102 | unsigned gpio, int dir) | |
| 103 | { | |
| 104 | u32 reg; | |
| 105 | u32 mask; | |
| 106 | u32 tmp; | |
| 107 | unsigned long flags; | |
| 108 | ||
| 109 | if (gpio >= chip->ngpio) | |
| 110 | BUG(); | |
| 111 | ||
| 112 | if (gpio < 32) { | |
| 113 | reg = GPIO_CTL_LO_REG; | |
| 114 | mask = 1 << gpio; | |
| 115 | } else { | |
| 116 | reg = GPIO_CTL_HI_REG; | |
| 117 | mask = 1 << (gpio - 32); | |
| 118 | } | |
| 119 | ||
| 120 | spin_lock_irqsave(&bcm63xx_gpio_lock, flags); | |
| 121 | tmp = bcm_gpio_readl(reg); | |
| 3e1bf29f | 122 | if (dir == BCM63XX_GPIO_DIR_IN) |
| e7300d04 MB |
123 | tmp &= ~mask; |
| 124 | else | |
| 125 | tmp |= mask; | |
| 126 | bcm_gpio_writel(tmp, reg); | |
| 127 | spin_unlock_irqrestore(&bcm63xx_gpio_lock, flags); | |
| 128 | ||
| 129 | return 0; | |
| 130 | } | |
| 131 | ||
| 132 | static int bcm63xx_gpio_direction_input(struct gpio_chip *chip, unsigned gpio) | |
| 133 | { | |
| 3e1bf29f | 134 | return bcm63xx_gpio_set_direction(chip, gpio, BCM63XX_GPIO_DIR_IN); |
| e7300d04 MB |
135 | } |
| 136 | ||
| 137 | static int bcm63xx_gpio_direction_output(struct gpio_chip *chip, | |
| 138 | unsigned gpio, int value) | |
| 139 | { | |
| 140 | bcm63xx_gpio_set(chip, gpio, value); | |
| 3e1bf29f | 141 | return bcm63xx_gpio_set_direction(chip, gpio, BCM63XX_GPIO_DIR_OUT); |
| e7300d04 MB |
142 | } |
| 143 | ||
| 144 | ||
| 145 | static struct gpio_chip bcm63xx_gpio_chip = { | |
| 146 | .label = "bcm63xx-gpio", | |
| 147 | .direction_input = bcm63xx_gpio_direction_input, | |
| 148 | .direction_output = bcm63xx_gpio_direction_output, | |
| 149 | .get = bcm63xx_gpio_get, | |
| 150 | .set = bcm63xx_gpio_set, | |
| 151 | .base = 0, | |
| 152 | }; | |
| 153 | ||
| 154 | int __init bcm63xx_gpio_init(void) | |
| 155 | { | |
| 92d9ae20 FF |
156 | bcm63xx_gpio_out_low_reg_init(); |
| 157 | ||
| 158 | gpio_out_low = bcm_gpio_readl(gpio_out_low_reg); | |
| 159 | if (!BCMCPU_IS_6345()) | |
| 160 | gpio_out_high = bcm_gpio_readl(GPIO_DATA_HI_REG); | |
| e7300d04 MB |
161 | bcm63xx_gpio_chip.ngpio = bcm63xx_gpio_count(); |
| 162 | pr_info("registering %d GPIOs\n", bcm63xx_gpio_chip.ngpio); | |
| 163 | ||
| 164 | return gpiochip_add(&bcm63xx_gpio_chip); | |
| 165 | } |