1 /* 2 * (C) Copyright 2009 Samsung Electronics 3 * Minkyu Kang <mk7.kang@samsung.com> 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 #include <common.h> 9 #include <dm.h> 10 #include <errno.h> 11 #include <fdtdec.h> 12 #include <malloc.h> 13 #include <asm/io.h> 14 #include <asm/gpio.h> 15 #include <dm/device-internal.h> 16 17 DECLARE_GLOBAL_DATA_PTR; 18 19 #define S5P_GPIO_GET_PIN(x) (x % GPIO_PER_BANK) 20 21 #define CON_MASK(val) (0xf << ((val) << 2)) 22 #define CON_SFR(gpio, cfg) ((cfg) << ((gpio) << 2)) 23 #define CON_SFR_UNSHIFT(val, gpio) ((val) >> ((gpio) << 2)) 24 25 #define DAT_MASK(gpio) (0x1 << (gpio)) 26 #define DAT_SET(gpio) (0x1 << (gpio)) 27 28 #define PULL_MASK(gpio) (0x3 << ((gpio) << 1)) 29 #define PULL_MODE(gpio, pull) ((pull) << ((gpio) << 1)) 30 31 #define DRV_MASK(gpio) (0x3 << ((gpio) << 1)) 32 #define DRV_SET(gpio, mode) ((mode) << ((gpio) << 1)) 33 #define RATE_MASK(gpio) (0x1 << (gpio + 16)) 34 #define RATE_SET(gpio) (0x1 << (gpio + 16)) 35 36 /* Platform data for each bank */ 37 struct exynos_gpio_platdata { 38 struct s5p_gpio_bank *bank; 39 const char *bank_name; /* Name of port, e.g. 'gpa0" */ 40 }; 41 42 /* Information about each bank at run-time */ 43 struct exynos_bank_info { 44 struct s5p_gpio_bank *bank; 45 }; 46 47 static struct s5p_gpio_bank *s5p_gpio_get_bank(unsigned int gpio) 48 { 49 const struct gpio_info *data; 50 unsigned int upto; 51 int i, count; 52 53 data = get_gpio_data(); 54 count = get_bank_num(); 55 upto = 0; 56 57 for (i = 0; i < count; i++) { 58 debug("i=%d, upto=%d\n", i, upto); 59 if (gpio < data->max_gpio) { 60 struct s5p_gpio_bank *bank; 61 bank = (struct s5p_gpio_bank *)data->reg_addr; 62 bank += (gpio - upto) / GPIO_PER_BANK; 63 debug("gpio=%d, bank=%p\n", gpio, bank); 64 return bank; 65 } 66 67 upto = data->max_gpio; 68 data++; 69 } 70 71 return NULL; 72 } 73 74 static void s5p_gpio_cfg_pin(struct s5p_gpio_bank *bank, int gpio, int cfg) 75 { 76 unsigned int value; 77 78 value = readl(&bank->con); 79 value &= ~CON_MASK(gpio); 80 value |= CON_SFR(gpio, cfg); 81 writel(value, &bank->con); 82 } 83 84 static void s5p_gpio_set_value(struct s5p_gpio_bank *bank, int gpio, int en) 85 { 86 unsigned int value; 87 88 value = readl(&bank->dat); 89 value &= ~DAT_MASK(gpio); 90 if (en) 91 value |= DAT_SET(gpio); 92 writel(value, &bank->dat); 93 } 94 95 #ifdef CONFIG_SPL_BUILD 96 /* Common GPIO API - SPL does not support driver model yet */ 97 int gpio_set_value(unsigned gpio, int value) 98 { 99 s5p_gpio_set_value(s5p_gpio_get_bank(gpio), 100 s5p_gpio_get_pin(gpio), value); 101 102 return 0; 103 } 104 #else 105 static int s5p_gpio_get_cfg_pin(struct s5p_gpio_bank *bank, int gpio) 106 { 107 unsigned int value; 108 109 value = readl(&bank->con); 110 value &= CON_MASK(gpio); 111 return CON_SFR_UNSHIFT(value, gpio); 112 } 113 114 static unsigned int s5p_gpio_get_value(struct s5p_gpio_bank *bank, int gpio) 115 { 116 unsigned int value; 117 118 value = readl(&bank->dat); 119 return !!(value & DAT_MASK(gpio)); 120 } 121 #endif /* CONFIG_SPL_BUILD */ 122 123 static void s5p_gpio_set_pull(struct s5p_gpio_bank *bank, int gpio, int mode) 124 { 125 unsigned int value; 126 127 value = readl(&bank->pull); 128 value &= ~PULL_MASK(gpio); 129 130 switch (mode) { 131 case S5P_GPIO_PULL_DOWN: 132 case S5P_GPIO_PULL_UP: 133 value |= PULL_MODE(gpio, mode); 134 break; 135 default: 136 break; 137 } 138 139 writel(value, &bank->pull); 140 } 141 142 static void s5p_gpio_set_drv(struct s5p_gpio_bank *bank, int gpio, int mode) 143 { 144 unsigned int value; 145 146 value = readl(&bank->drv); 147 value &= ~DRV_MASK(gpio); 148 149 switch (mode) { 150 case S5P_GPIO_DRV_1X: 151 case S5P_GPIO_DRV_2X: 152 case S5P_GPIO_DRV_3X: 153 case S5P_GPIO_DRV_4X: 154 value |= DRV_SET(gpio, mode); 155 break; 156 default: 157 return; 158 } 159 160 writel(value, &bank->drv); 161 } 162 163 static void s5p_gpio_set_rate(struct s5p_gpio_bank *bank, int gpio, int mode) 164 { 165 unsigned int value; 166 167 value = readl(&bank->drv); 168 value &= ~RATE_MASK(gpio); 169 170 switch (mode) { 171 case S5P_GPIO_DRV_FAST: 172 case S5P_GPIO_DRV_SLOW: 173 value |= RATE_SET(gpio); 174 break; 175 default: 176 return; 177 } 178 179 writel(value, &bank->drv); 180 } 181 182 int s5p_gpio_get_pin(unsigned gpio) 183 { 184 return S5P_GPIO_GET_PIN(gpio); 185 } 186 187 /* Driver model interface */ 188 #ifndef CONFIG_SPL_BUILD 189 /* set GPIO pin 'gpio' as an input */ 190 static int exynos_gpio_direction_input(struct udevice *dev, unsigned offset) 191 { 192 struct exynos_bank_info *state = dev_get_priv(dev); 193 194 /* Configure GPIO direction as input. */ 195 s5p_gpio_cfg_pin(state->bank, offset, S5P_GPIO_INPUT); 196 197 return 0; 198 } 199 200 /* set GPIO pin 'gpio' as an output, with polarity 'value' */ 201 static int exynos_gpio_direction_output(struct udevice *dev, unsigned offset, 202 int value) 203 { 204 struct exynos_bank_info *state = dev_get_priv(dev); 205 206 /* Configure GPIO output value. */ 207 s5p_gpio_set_value(state->bank, offset, value); 208 209 /* Configure GPIO direction as output. */ 210 s5p_gpio_cfg_pin(state->bank, offset, S5P_GPIO_OUTPUT); 211 212 return 0; 213 } 214 215 /* read GPIO IN value of pin 'gpio' */ 216 static int exynos_gpio_get_value(struct udevice *dev, unsigned offset) 217 { 218 struct exynos_bank_info *state = dev_get_priv(dev); 219 220 return s5p_gpio_get_value(state->bank, offset); 221 } 222 223 /* write GPIO OUT value to pin 'gpio' */ 224 static int exynos_gpio_set_value(struct udevice *dev, unsigned offset, 225 int value) 226 { 227 struct exynos_bank_info *state = dev_get_priv(dev); 228 229 s5p_gpio_set_value(state->bank, offset, value); 230 231 return 0; 232 } 233 #endif /* nCONFIG_SPL_BUILD */ 234 235 /* 236 * There is no common GPIO API for pull, drv, pin, rate (yet). These 237 * functions are kept here to preserve function ordering for review. 238 */ 239 void gpio_set_pull(int gpio, int mode) 240 { 241 s5p_gpio_set_pull(s5p_gpio_get_bank(gpio), 242 s5p_gpio_get_pin(gpio), mode); 243 } 244 245 void gpio_set_drv(int gpio, int mode) 246 { 247 s5p_gpio_set_drv(s5p_gpio_get_bank(gpio), 248 s5p_gpio_get_pin(gpio), mode); 249 } 250 251 void gpio_cfg_pin(int gpio, int cfg) 252 { 253 s5p_gpio_cfg_pin(s5p_gpio_get_bank(gpio), 254 s5p_gpio_get_pin(gpio), cfg); 255 } 256 257 void gpio_set_rate(int gpio, int mode) 258 { 259 s5p_gpio_set_rate(s5p_gpio_get_bank(gpio), 260 s5p_gpio_get_pin(gpio), mode); 261 } 262 263 #ifndef CONFIG_SPL_BUILD 264 static int exynos_gpio_get_function(struct udevice *dev, unsigned offset) 265 { 266 struct exynos_bank_info *state = dev_get_priv(dev); 267 int cfg; 268 269 cfg = s5p_gpio_get_cfg_pin(state->bank, offset); 270 if (cfg == S5P_GPIO_OUTPUT) 271 return GPIOF_OUTPUT; 272 else if (cfg == S5P_GPIO_INPUT) 273 return GPIOF_INPUT; 274 else 275 return GPIOF_FUNC; 276 } 277 278 static const struct dm_gpio_ops gpio_exynos_ops = { 279 .direction_input = exynos_gpio_direction_input, 280 .direction_output = exynos_gpio_direction_output, 281 .get_value = exynos_gpio_get_value, 282 .set_value = exynos_gpio_set_value, 283 .get_function = exynos_gpio_get_function, 284 }; 285 286 static int gpio_exynos_probe(struct udevice *dev) 287 { 288 struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev); 289 struct exynos_bank_info *priv = dev->priv; 290 struct exynos_gpio_platdata *plat = dev->platdata; 291 292 /* Only child devices have ports */ 293 if (!plat) 294 return 0; 295 296 priv->bank = plat->bank; 297 298 uc_priv->gpio_count = GPIO_PER_BANK; 299 uc_priv->bank_name = plat->bank_name; 300 301 return 0; 302 } 303 304 /** 305 * We have a top-level GPIO device with no actual GPIOs. It has a child 306 * device for each Exynos GPIO bank. 307 */ 308 static int gpio_exynos_bind(struct udevice *parent) 309 { 310 struct exynos_gpio_platdata *plat = parent->platdata; 311 struct s5p_gpio_bank *bank, *base; 312 const void *blob = gd->fdt_blob; 313 int node; 314 315 /* If this is a child device, there is nothing to do here */ 316 if (plat) 317 return 0; 318 319 base = (struct s5p_gpio_bank *)dev_get_addr(parent); 320 for (node = fdt_first_subnode(blob, parent->of_offset), bank = base; 321 node > 0; 322 node = fdt_next_subnode(blob, node), bank++) { 323 struct exynos_gpio_platdata *plat; 324 struct udevice *dev; 325 fdt_addr_t reg; 326 int ret; 327 328 if (!fdtdec_get_bool(blob, node, "gpio-controller")) 329 continue; 330 plat = calloc(1, sizeof(*plat)); 331 if (!plat) 332 return -ENOMEM; 333 334 plat->bank_name = fdt_get_name(blob, node, NULL); 335 ret = device_bind(parent, parent->driver, 336 plat->bank_name, plat, -1, &dev); 337 if (ret) 338 return ret; 339 340 dev->of_offset = node; 341 342 reg = dev_get_addr(dev); 343 if (reg != FDT_ADDR_T_NONE) 344 bank = (struct s5p_gpio_bank *)((ulong)base + reg); 345 346 plat->bank = bank; 347 348 debug("dev at %p: %s\n", bank, plat->bank_name); 349 } 350 351 return 0; 352 } 353 354 static const struct udevice_id exynos_gpio_ids[] = { 355 { .compatible = "samsung,s5pc100-pinctrl" }, 356 { .compatible = "samsung,s5pc110-pinctrl" }, 357 { .compatible = "samsung,exynos4210-pinctrl" }, 358 { .compatible = "samsung,exynos4x12-pinctrl" }, 359 { .compatible = "samsung,exynos5250-pinctrl" }, 360 { .compatible = "samsung,exynos5420-pinctrl" }, 361 { } 362 }; 363 364 U_BOOT_DRIVER(gpio_exynos) = { 365 .name = "gpio_exynos", 366 .id = UCLASS_GPIO, 367 .of_match = exynos_gpio_ids, 368 .bind = gpio_exynos_bind, 369 .probe = gpio_exynos_probe, 370 .priv_auto_alloc_size = sizeof(struct exynos_bank_info), 371 .ops = &gpio_exynos_ops, 372 }; 373 #endif 374