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 void bcm63xx_gpio_set(struct gpio_chip *chip, 39 unsigned gpio, int val) 40 { 41 u32 reg; 42 u32 mask; 43 u32 *v; 44 unsigned long flags; 45 46 BUG_ON(gpio >= chip->ngpio); 47 48 if (gpio < 32) { 49 reg = gpio_out_low_reg; 50 mask = 1 << gpio; 51 v = &gpio_out_low; 52 } else { 53 reg = GPIO_DATA_HI_REG; 54 mask = 1 << (gpio - 32); 55 v = &gpio_out_high; 56 } 57 58 spin_lock_irqsave(&bcm63xx_gpio_lock, flags); 59 if (val) 60 *v |= mask; 61 else 62 *v &= ~mask; 63 bcm_gpio_writel(*v, reg); 64 spin_unlock_irqrestore(&bcm63xx_gpio_lock, flags); 65 } 66 67 static int bcm63xx_gpio_get(struct gpio_chip *chip, unsigned gpio) 68 { 69 u32 reg; 70 u32 mask; 71 72 BUG_ON(gpio >= chip->ngpio); 73 74 if (gpio < 32) { 75 reg = gpio_out_low_reg; 76 mask = 1 << gpio; 77 } else { 78 reg = GPIO_DATA_HI_REG; 79 mask = 1 << (gpio - 32); 80 } 81 82 return !!(bcm_gpio_readl(reg) & mask); 83 } 84 85 static int bcm63xx_gpio_set_direction(struct gpio_chip *chip, 86 unsigned gpio, int dir) 87 { 88 u32 reg; 89 u32 mask; 90 u32 tmp; 91 unsigned long flags; 92 93 BUG_ON(gpio >= chip->ngpio); 94 95 if (gpio < 32) { 96 reg = GPIO_CTL_LO_REG; 97 mask = 1 << gpio; 98 } else { 99 reg = GPIO_CTL_HI_REG; 100 mask = 1 << (gpio - 32); 101 } 102 103 spin_lock_irqsave(&bcm63xx_gpio_lock, flags); 104 tmp = bcm_gpio_readl(reg); 105 if (dir == BCM63XX_GPIO_DIR_IN) 106 tmp &= ~mask; 107 else 108 tmp |= mask; 109 bcm_gpio_writel(tmp, reg); 110 spin_unlock_irqrestore(&bcm63xx_gpio_lock, flags); 111 112 return 0; 113 } 114 115 static int bcm63xx_gpio_direction_input(struct gpio_chip *chip, unsigned gpio) 116 { 117 return bcm63xx_gpio_set_direction(chip, gpio, BCM63XX_GPIO_DIR_IN); 118 } 119 120 static int bcm63xx_gpio_direction_output(struct gpio_chip *chip, 121 unsigned gpio, int value) 122 { 123 bcm63xx_gpio_set(chip, gpio, value); 124 return bcm63xx_gpio_set_direction(chip, gpio, BCM63XX_GPIO_DIR_OUT); 125 } 126 127 128 static struct gpio_chip bcm63xx_gpio_chip = { 129 .label = "bcm63xx-gpio", 130 .direction_input = bcm63xx_gpio_direction_input, 131 .direction_output = bcm63xx_gpio_direction_output, 132 .get = bcm63xx_gpio_get, 133 .set = bcm63xx_gpio_set, 134 .base = 0, 135 }; 136 137 int __init bcm63xx_gpio_init(void) 138 { 139 bcm63xx_gpio_out_low_reg_init(); 140 141 gpio_out_low = bcm_gpio_readl(gpio_out_low_reg); 142 if (!BCMCPU_IS_6345()) 143 gpio_out_high = bcm_gpio_readl(GPIO_DATA_HI_REG); 144 bcm63xx_gpio_chip.ngpio = bcm63xx_gpio_count(); 145 pr_info("registering %d GPIOs\n", bcm63xx_gpio_chip.ngpio); 146 147 return gpiochip_add_data(&bcm63xx_gpio_chip, NULL); 148 } 149