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/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 #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 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) { 64 reg = gpio_out_low_reg; 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) { 91 reg = gpio_out_low_reg; 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); 122 if (dir == BCM63XX_GPIO_DIR_IN) 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 { 134 return bcm63xx_gpio_set_direction(chip, gpio, BCM63XX_GPIO_DIR_IN); 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); 141 return bcm63xx_gpio_set_direction(chip, gpio, BCM63XX_GPIO_DIR_OUT); 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 { 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); 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 } 166