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) 2008-2011 Florian Fainelli <florian@openwrt.org> 8 */ 9 10 #include <linux/kernel.h> 11 #include <linux/init.h> 12 #include <linux/spinlock.h> 13 #include <linux/platform_device.h> 14 #include <linux/gpio/driver.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 u32 gpio_out_low_reg; 22 23 static void bcm63xx_gpio_out_low_reg_init(void) 24 { 25 switch (bcm63xx_get_cpu_id()) { 26 case BCM6345_CPU_ID: 27 gpio_out_low_reg = GPIO_DATA_LO_REG_6345; 28 break; 29 default: 30 gpio_out_low_reg = GPIO_DATA_LO_REG; 31 break; 32 } 33 } 34 35 static DEFINE_SPINLOCK(bcm63xx_gpio_lock); 36 static u32 gpio_out_low, gpio_out_high; 37 38 static int bcm63xx_gpio_set(struct gpio_chip *chip, unsigned int gpio, int val) 39 { 40 u32 reg; 41 u32 mask; 42 u32 *v; 43 unsigned long flags; 44 45 BUG_ON(gpio >= chip->ngpio); 46 47 if (gpio < 32) { 48 reg = gpio_out_low_reg; 49 mask = 1 << gpio; 50 v = &gpio_out_low; 51 } else { 52 reg = GPIO_DATA_HI_REG; 53 mask = 1 << (gpio - 32); 54 v = &gpio_out_high; 55 } 56 57 spin_lock_irqsave(&bcm63xx_gpio_lock, flags); 58 if (val) 59 *v |= mask; 60 else 61 *v &= ~mask; 62 bcm_gpio_writel(*v, reg); 63 spin_unlock_irqrestore(&bcm63xx_gpio_lock, flags); 64 65 return 0; 66 } 67 68 static int bcm63xx_gpio_get(struct gpio_chip *chip, unsigned gpio) 69 { 70 u32 reg; 71 u32 mask; 72 73 BUG_ON(gpio >= chip->ngpio); 74 75 if (gpio < 32) { 76 reg = gpio_out_low_reg; 77 mask = 1 << gpio; 78 } else { 79 reg = GPIO_DATA_HI_REG; 80 mask = 1 << (gpio - 32); 81 } 82 83 return !!(bcm_gpio_readl(reg) & mask); 84 } 85 86 static int bcm63xx_gpio_set_direction(struct gpio_chip *chip, 87 unsigned gpio, int dir) 88 { 89 u32 reg; 90 u32 mask; 91 u32 tmp; 92 unsigned long flags; 93 94 BUG_ON(gpio >= chip->ngpio); 95 96 if (gpio < 32) { 97 reg = GPIO_CTL_LO_REG; 98 mask = 1 << gpio; 99 } else { 100 reg = GPIO_CTL_HI_REG; 101 mask = 1 << (gpio - 32); 102 } 103 104 spin_lock_irqsave(&bcm63xx_gpio_lock, flags); 105 tmp = bcm_gpio_readl(reg); 106 if (dir == BCM63XX_GPIO_DIR_IN) 107 tmp &= ~mask; 108 else 109 tmp |= mask; 110 bcm_gpio_writel(tmp, reg); 111 spin_unlock_irqrestore(&bcm63xx_gpio_lock, flags); 112 113 return 0; 114 } 115 116 static int bcm63xx_gpio_direction_input(struct gpio_chip *chip, unsigned gpio) 117 { 118 return bcm63xx_gpio_set_direction(chip, gpio, BCM63XX_GPIO_DIR_IN); 119 } 120 121 static int bcm63xx_gpio_direction_output(struct gpio_chip *chip, 122 unsigned gpio, int value) 123 { 124 bcm63xx_gpio_set(chip, gpio, value); 125 return bcm63xx_gpio_set_direction(chip, gpio, BCM63XX_GPIO_DIR_OUT); 126 } 127 128 129 static struct gpio_chip bcm63xx_gpio_chip = { 130 .label = "bcm63xx-gpio", 131 .direction_input = bcm63xx_gpio_direction_input, 132 .direction_output = bcm63xx_gpio_direction_output, 133 .get = bcm63xx_gpio_get, 134 .set = bcm63xx_gpio_set, 135 .base = 0, 136 }; 137 138 int __init bcm63xx_gpio_init(void) 139 { 140 bcm63xx_gpio_out_low_reg_init(); 141 142 gpio_out_low = bcm_gpio_readl(gpio_out_low_reg); 143 if (!BCMCPU_IS_6345()) 144 gpio_out_high = bcm_gpio_readl(GPIO_DATA_HI_REG); 145 bcm63xx_gpio_chip.ngpio = bcm63xx_gpio_count(); 146 pr_info("registering %d GPIOs\n", bcm63xx_gpio_chip.ngpio); 147 148 return gpiochip_add_data(&bcm63xx_gpio_chip, NULL); 149 } 150