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); 135