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 if (gpio >= chip->ngpio) 47 BUG(); 48 49 if (gpio < 32) { 50 reg = gpio_out_low_reg; 51 mask = 1 << gpio; 52 v = &gpio_out_low; 53 } else { 54 reg = GPIO_DATA_HI_REG; 55 mask = 1 << (gpio - 32); 56 v = &gpio_out_high; 57 } 58 59 spin_lock_irqsave(&bcm63xx_gpio_lock, flags); 60 if (val) 61 *v |= mask; 62 else 63 *v &= ~mask; 64 bcm_gpio_writel(*v, reg); 65 spin_unlock_irqrestore(&bcm63xx_gpio_lock, flags); 66 } 67 68 static int bcm63xx_gpio_get(struct gpio_chip *chip, unsigned gpio) 69 { 70 u32 reg; 71 u32 mask; 72 73 if (gpio >= chip->ngpio) 74 BUG(); 75 76 if (gpio < 32) { 77 reg = gpio_out_low_reg; 78 mask = 1 << gpio; 79 } else { 80 reg = GPIO_DATA_HI_REG; 81 mask = 1 << (gpio - 32); 82 } 83 84 return !!(bcm_gpio_readl(reg) & mask); 85 } 86 87 static int bcm63xx_gpio_set_direction(struct gpio_chip *chip, 88 unsigned gpio, int dir) 89 { 90 u32 reg; 91 u32 mask; 92 u32 tmp; 93 unsigned long flags; 94 95 if (gpio >= chip->ngpio) 96 BUG(); 97 98 if (gpio < 32) { 99 reg = GPIO_CTL_LO_REG; 100 mask = 1 << gpio; 101 } else { 102 reg = GPIO_CTL_HI_REG; 103 mask = 1 << (gpio - 32); 104 } 105 106 spin_lock_irqsave(&bcm63xx_gpio_lock, flags); 107 tmp = bcm_gpio_readl(reg); 108 if (dir == BCM63XX_GPIO_DIR_IN) 109 tmp &= ~mask; 110 else 111 tmp |= mask; 112 bcm_gpio_writel(tmp, reg); 113 spin_unlock_irqrestore(&bcm63xx_gpio_lock, flags); 114 115 return 0; 116 } 117 118 static int bcm63xx_gpio_direction_input(struct gpio_chip *chip, unsigned gpio) 119 { 120 return bcm63xx_gpio_set_direction(chip, gpio, BCM63XX_GPIO_DIR_IN); 121 } 122 123 static int bcm63xx_gpio_direction_output(struct gpio_chip *chip, 124 unsigned gpio, int value) 125 { 126 bcm63xx_gpio_set(chip, gpio, value); 127 return bcm63xx_gpio_set_direction(chip, gpio, BCM63XX_GPIO_DIR_OUT); 128 } 129 130 131 static struct gpio_chip bcm63xx_gpio_chip = { 132 .label = "bcm63xx-gpio", 133 .direction_input = bcm63xx_gpio_direction_input, 134 .direction_output = bcm63xx_gpio_direction_output, 135 .get = bcm63xx_gpio_get, 136 .set = bcm63xx_gpio_set, 137 .base = 0, 138 }; 139 140 int __init bcm63xx_gpio_init(void) 141 { 142 bcm63xx_gpio_out_low_reg_init(); 143 144 gpio_out_low = bcm_gpio_readl(gpio_out_low_reg); 145 if (!BCMCPU_IS_6345()) 146 gpio_out_high = bcm_gpio_readl(GPIO_DATA_HI_REG); 147 bcm63xx_gpio_chip.ngpio = bcm63xx_gpio_count(); 148 pr_info("registering %d GPIOs\n", bcm63xx_gpio_chip.ngpio); 149 150 return gpiochip_add_data(&bcm63xx_gpio_chip, NULL); 151 } 152