1 /* 2 * Sonics Silicon Backplane 3 * GPIO driver 4 * 5 * Copyright 2011, Broadcom Corporation 6 * Copyright 2012, Hauke Mehrtens <hauke@hauke-m.de> 7 * 8 * Licensed under the GNU/GPL. See COPYING for details. 9 */ 10 11 #include <linux/gpio.h> 12 #include <linux/export.h> 13 #include <linux/ssb/ssb.h> 14 15 #include "ssb_private.h" 16 17 static struct ssb_bus *ssb_gpio_get_bus(struct gpio_chip *chip) 18 { 19 return container_of(chip, struct ssb_bus, gpio); 20 } 21 22 static int ssb_gpio_chipco_get_value(struct gpio_chip *chip, unsigned gpio) 23 { 24 struct ssb_bus *bus = ssb_gpio_get_bus(chip); 25 26 return !!ssb_chipco_gpio_in(&bus->chipco, 1 << gpio); 27 } 28 29 static void ssb_gpio_chipco_set_value(struct gpio_chip *chip, unsigned gpio, 30 int value) 31 { 32 struct ssb_bus *bus = ssb_gpio_get_bus(chip); 33 34 ssb_chipco_gpio_out(&bus->chipco, 1 << gpio, value ? 1 << gpio : 0); 35 } 36 37 static int ssb_gpio_chipco_direction_input(struct gpio_chip *chip, 38 unsigned gpio) 39 { 40 struct ssb_bus *bus = ssb_gpio_get_bus(chip); 41 42 ssb_chipco_gpio_outen(&bus->chipco, 1 << gpio, 0); 43 return 0; 44 } 45 46 static int ssb_gpio_chipco_direction_output(struct gpio_chip *chip, 47 unsigned gpio, int value) 48 { 49 struct ssb_bus *bus = ssb_gpio_get_bus(chip); 50 51 ssb_chipco_gpio_outen(&bus->chipco, 1 << gpio, 1 << gpio); 52 ssb_chipco_gpio_out(&bus->chipco, 1 << gpio, value ? 1 << gpio : 0); 53 return 0; 54 } 55 56 static int ssb_gpio_chipco_request(struct gpio_chip *chip, unsigned gpio) 57 { 58 struct ssb_bus *bus = ssb_gpio_get_bus(chip); 59 60 ssb_chipco_gpio_control(&bus->chipco, 1 << gpio, 0); 61 /* clear pulldown */ 62 ssb_chipco_gpio_pulldown(&bus->chipco, 1 << gpio, 0); 63 /* Set pullup */ 64 ssb_chipco_gpio_pullup(&bus->chipco, 1 << gpio, 1 << gpio); 65 66 return 0; 67 } 68 69 static void ssb_gpio_chipco_free(struct gpio_chip *chip, unsigned gpio) 70 { 71 struct ssb_bus *bus = ssb_gpio_get_bus(chip); 72 73 /* clear pullup */ 74 ssb_chipco_gpio_pullup(&bus->chipco, 1 << gpio, 0); 75 } 76 77 static int ssb_gpio_chipco_init(struct ssb_bus *bus) 78 { 79 struct gpio_chip *chip = &bus->gpio; 80 81 chip->label = "ssb_chipco_gpio"; 82 chip->owner = THIS_MODULE; 83 chip->request = ssb_gpio_chipco_request; 84 chip->free = ssb_gpio_chipco_free; 85 chip->get = ssb_gpio_chipco_get_value; 86 chip->set = ssb_gpio_chipco_set_value; 87 chip->direction_input = ssb_gpio_chipco_direction_input; 88 chip->direction_output = ssb_gpio_chipco_direction_output; 89 chip->ngpio = 16; 90 /* There is just one SoC in one device and its GPIO addresses should be 91 * deterministic to address them more easily. The other buses could get 92 * a random base number. */ 93 if (bus->bustype == SSB_BUSTYPE_SSB) 94 chip->base = 0; 95 else 96 chip->base = -1; 97 98 return gpiochip_add(chip); 99 } 100 101 #ifdef CONFIG_SSB_DRIVER_EXTIF 102 103 static int ssb_gpio_extif_get_value(struct gpio_chip *chip, unsigned gpio) 104 { 105 struct ssb_bus *bus = ssb_gpio_get_bus(chip); 106 107 return !!ssb_extif_gpio_in(&bus->extif, 1 << gpio); 108 } 109 110 static void ssb_gpio_extif_set_value(struct gpio_chip *chip, unsigned gpio, 111 int value) 112 { 113 struct ssb_bus *bus = ssb_gpio_get_bus(chip); 114 115 ssb_extif_gpio_out(&bus->extif, 1 << gpio, value ? 1 << gpio : 0); 116 } 117 118 static int ssb_gpio_extif_direction_input(struct gpio_chip *chip, 119 unsigned gpio) 120 { 121 struct ssb_bus *bus = ssb_gpio_get_bus(chip); 122 123 ssb_extif_gpio_outen(&bus->extif, 1 << gpio, 0); 124 return 0; 125 } 126 127 static int ssb_gpio_extif_direction_output(struct gpio_chip *chip, 128 unsigned gpio, int value) 129 { 130 struct ssb_bus *bus = ssb_gpio_get_bus(chip); 131 132 ssb_extif_gpio_outen(&bus->extif, 1 << gpio, 1 << gpio); 133 ssb_extif_gpio_out(&bus->extif, 1 << gpio, value ? 1 << gpio : 0); 134 return 0; 135 } 136 137 static int ssb_gpio_extif_init(struct ssb_bus *bus) 138 { 139 struct gpio_chip *chip = &bus->gpio; 140 141 chip->label = "ssb_extif_gpio"; 142 chip->owner = THIS_MODULE; 143 chip->get = ssb_gpio_extif_get_value; 144 chip->set = ssb_gpio_extif_set_value; 145 chip->direction_input = ssb_gpio_extif_direction_input; 146 chip->direction_output = ssb_gpio_extif_direction_output; 147 chip->ngpio = 5; 148 /* There is just one SoC in one device and its GPIO addresses should be 149 * deterministic to address them more easily. The other buses could get 150 * a random base number. */ 151 if (bus->bustype == SSB_BUSTYPE_SSB) 152 chip->base = 0; 153 else 154 chip->base = -1; 155 156 return gpiochip_add(chip); 157 } 158 159 #else 160 static int ssb_gpio_extif_init(struct ssb_bus *bus) 161 { 162 return -ENOTSUPP; 163 } 164 #endif 165 166 int ssb_gpio_init(struct ssb_bus *bus) 167 { 168 if (ssb_chipco_available(&bus->chipco)) 169 return ssb_gpio_chipco_init(bus); 170 else if (ssb_extif_available(&bus->extif)) 171 return ssb_gpio_extif_init(bus); 172 else 173 SSB_WARN_ON(1); 174 175 return -1; 176 } 177