1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Pinctrl driver for the Wondermedia SoC's 4 * 5 * Copyright (c) 2013 Tony Prisk <linux@prisktech.co.nz> 6 */ 7 8 #include <linux/err.h> 9 #include <linux/gpio/driver.h> 10 #include <linux/interrupt.h> 11 #include <linux/io.h> 12 #include <linux/irq.h> 13 #include <linux/of.h> 14 #include <linux/of_irq.h> 15 #include <linux/pinctrl/consumer.h> 16 #include <linux/pinctrl/machine.h> 17 #include <linux/pinctrl/pinconf.h> 18 #include <linux/pinctrl/pinconf-generic.h> 19 #include <linux/pinctrl/pinctrl.h> 20 #include <linux/pinctrl/pinmux.h> 21 #include <linux/platform_device.h> 22 #include <linux/slab.h> 23 24 #include "pinctrl-wmt.h" 25 26 static inline void wmt_setbits(struct wmt_pinctrl_data *data, u32 reg, 27 u32 mask) 28 { 29 u32 val; 30 31 val = readl_relaxed(data->base + reg); 32 val |= mask; 33 writel_relaxed(val, data->base + reg); 34 } 35 36 static inline void wmt_clearbits(struct wmt_pinctrl_data *data, u32 reg, 37 u32 mask) 38 { 39 u32 val; 40 41 val = readl_relaxed(data->base + reg); 42 val &= ~mask; 43 writel_relaxed(val, data->base + reg); 44 } 45 46 enum wmt_func_sel { 47 WMT_FSEL_GPIO_IN = 0, 48 WMT_FSEL_GPIO_OUT = 1, 49 WMT_FSEL_ALT = 2, 50 WMT_FSEL_COUNT = 3, 51 }; 52 53 static const char * const wmt_functions[WMT_FSEL_COUNT] = { 54 [WMT_FSEL_GPIO_IN] = "gpio_in", 55 [WMT_FSEL_GPIO_OUT] = "gpio_out", 56 [WMT_FSEL_ALT] = "alt", 57 }; 58 59 static int wmt_pmx_get_functions_count(struct pinctrl_dev *pctldev) 60 { 61 return WMT_FSEL_COUNT; 62 } 63 64 static const char *wmt_pmx_get_function_name(struct pinctrl_dev *pctldev, 65 unsigned selector) 66 { 67 return wmt_functions[selector]; 68 } 69 70 static int wmt_pmx_get_function_groups(struct pinctrl_dev *pctldev, 71 unsigned selector, 72 const char * const **groups, 73 unsigned * const num_groups) 74 { 75 struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev); 76 77 /* every pin does every function */ 78 *groups = data->groups; 79 *num_groups = data->ngroups; 80 81 return 0; 82 } 83 84 static int wmt_set_pinmux(struct wmt_pinctrl_data *data, unsigned func, 85 unsigned pin) 86 { 87 u32 bank = WMT_BANK_FROM_PIN(pin); 88 u32 bit = WMT_BIT_FROM_PIN(pin); 89 u32 reg_en = data->banks[bank].reg_en; 90 u32 reg_dir = data->banks[bank].reg_dir; 91 92 if (reg_dir == NO_REG) { 93 dev_err(data->dev, "pin:%d no direction register defined\n", 94 pin); 95 return -EINVAL; 96 } 97 98 /* 99 * If reg_en == NO_REG, we assume it is a dedicated GPIO and cannot be 100 * disabled (as on VT8500) and that no alternate function is available. 101 */ 102 switch (func) { 103 case WMT_FSEL_GPIO_IN: 104 if (reg_en != NO_REG) 105 wmt_setbits(data, reg_en, BIT(bit)); 106 wmt_clearbits(data, reg_dir, BIT(bit)); 107 break; 108 case WMT_FSEL_GPIO_OUT: 109 if (reg_en != NO_REG) 110 wmt_setbits(data, reg_en, BIT(bit)); 111 wmt_setbits(data, reg_dir, BIT(bit)); 112 break; 113 case WMT_FSEL_ALT: 114 if (reg_en == NO_REG) { 115 dev_err(data->dev, "pin:%d no alt function available\n", 116 pin); 117 return -EINVAL; 118 } 119 wmt_clearbits(data, reg_en, BIT(bit)); 120 } 121 122 return 0; 123 } 124 125 static int wmt_pmx_set_mux(struct pinctrl_dev *pctldev, 126 unsigned func_selector, 127 unsigned group_selector) 128 { 129 struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev); 130 u32 pinnum = data->pins[group_selector].number; 131 132 return wmt_set_pinmux(data, func_selector, pinnum); 133 } 134 135 static void wmt_pmx_gpio_disable_free(struct pinctrl_dev *pctldev, 136 struct pinctrl_gpio_range *range, 137 unsigned offset) 138 { 139 struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev); 140 141 /* disable by setting GPIO_IN */ 142 wmt_set_pinmux(data, WMT_FSEL_GPIO_IN, offset); 143 } 144 145 static int wmt_pmx_gpio_set_direction(struct pinctrl_dev *pctldev, 146 struct pinctrl_gpio_range *range, 147 unsigned offset, 148 bool input) 149 { 150 struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev); 151 152 wmt_set_pinmux(data, (input ? WMT_FSEL_GPIO_IN : WMT_FSEL_GPIO_OUT), 153 offset); 154 155 return 0; 156 } 157 158 static const struct pinmux_ops wmt_pinmux_ops = { 159 .get_functions_count = wmt_pmx_get_functions_count, 160 .get_function_name = wmt_pmx_get_function_name, 161 .get_function_groups = wmt_pmx_get_function_groups, 162 .set_mux = wmt_pmx_set_mux, 163 .gpio_disable_free = wmt_pmx_gpio_disable_free, 164 .gpio_set_direction = wmt_pmx_gpio_set_direction, 165 }; 166 167 static int wmt_get_groups_count(struct pinctrl_dev *pctldev) 168 { 169 struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev); 170 171 return data->ngroups; 172 } 173 174 static const char *wmt_get_group_name(struct pinctrl_dev *pctldev, 175 unsigned selector) 176 { 177 struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev); 178 179 return data->groups[selector]; 180 } 181 182 static int wmt_get_group_pins(struct pinctrl_dev *pctldev, 183 unsigned selector, 184 const unsigned **pins, 185 unsigned *num_pins) 186 { 187 struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev); 188 189 *pins = &data->pins[selector].number; 190 *num_pins = 1; 191 192 return 0; 193 } 194 195 static int wmt_pctl_find_group_by_pin(struct wmt_pinctrl_data *data, u32 pin) 196 { 197 int i; 198 199 for (i = 0; i < data->npins; i++) { 200 if (data->pins[i].number == pin) 201 return i; 202 } 203 204 return -EINVAL; 205 } 206 207 static int wmt_pctl_dt_node_to_map_func(struct wmt_pinctrl_data *data, 208 struct device_node *np, 209 u32 pin, u32 fnum, 210 struct pinctrl_map **maps) 211 { 212 int group; 213 struct pinctrl_map *map = *maps; 214 215 if (fnum >= ARRAY_SIZE(wmt_functions)) { 216 dev_err(data->dev, "invalid wm,function %d\n", fnum); 217 return -EINVAL; 218 } 219 220 group = wmt_pctl_find_group_by_pin(data, pin); 221 if (group < 0) { 222 dev_err(data->dev, "unable to match pin %d to group\n", pin); 223 return group; 224 } 225 226 map->type = PIN_MAP_TYPE_MUX_GROUP; 227 map->data.mux.group = data->groups[group]; 228 map->data.mux.function = wmt_functions[fnum]; 229 (*maps)++; 230 231 return 0; 232 } 233 234 static int wmt_pctl_dt_node_to_map_pull(struct wmt_pinctrl_data *data, 235 struct device_node *np, 236 u32 pin, u32 pull, 237 struct pinctrl_map **maps) 238 { 239 int group; 240 unsigned long *configs; 241 struct pinctrl_map *map = *maps; 242 243 if (pull > 2) { 244 dev_err(data->dev, "invalid wm,pull %d\n", pull); 245 return -EINVAL; 246 } 247 248 group = wmt_pctl_find_group_by_pin(data, pin); 249 if (group < 0) { 250 dev_err(data->dev, "unable to match pin %d to group\n", pin); 251 return group; 252 } 253 254 configs = kzalloc(sizeof(*configs), GFP_KERNEL); 255 if (!configs) 256 return -ENOMEM; 257 258 switch (pull) { 259 case 0: 260 configs[0] = PIN_CONFIG_BIAS_DISABLE; 261 break; 262 case 1: 263 configs[0] = PIN_CONFIG_BIAS_PULL_DOWN; 264 break; 265 case 2: 266 configs[0] = PIN_CONFIG_BIAS_PULL_UP; 267 break; 268 default: 269 configs[0] = PIN_CONFIG_BIAS_DISABLE; 270 dev_err(data->dev, "invalid pull state %d - disabling\n", pull); 271 } 272 273 map->type = PIN_MAP_TYPE_CONFIGS_PIN; 274 map->data.configs.group_or_pin = data->groups[group]; 275 map->data.configs.configs = configs; 276 map->data.configs.num_configs = 1; 277 (*maps)++; 278 279 return 0; 280 } 281 282 static void wmt_pctl_dt_free_map(struct pinctrl_dev *pctldev, 283 struct pinctrl_map *maps, 284 unsigned num_maps) 285 { 286 int i; 287 288 for (i = 0; i < num_maps; i++) 289 if (maps[i].type == PIN_MAP_TYPE_CONFIGS_PIN) 290 kfree(maps[i].data.configs.configs); 291 292 kfree(maps); 293 } 294 295 static int wmt_pctl_dt_node_to_map(struct pinctrl_dev *pctldev, 296 struct device_node *np, 297 struct pinctrl_map **map, 298 unsigned *num_maps) 299 { 300 struct pinctrl_map *maps, *cur_map; 301 struct property *pins, *funcs, *pulls; 302 u32 pin, func, pull; 303 int num_pins, num_funcs, num_pulls, maps_per_pin; 304 int i, err; 305 struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev); 306 307 pins = of_find_property(np, "wm,pins", NULL); 308 if (!pins) { 309 dev_err(data->dev, "missing wmt,pins property\n"); 310 return -EINVAL; 311 } 312 313 funcs = of_find_property(np, "wm,function", NULL); 314 pulls = of_find_property(np, "wm,pull", NULL); 315 316 if (!funcs && !pulls) { 317 dev_err(data->dev, "neither wm,function nor wm,pull specified\n"); 318 return -EINVAL; 319 } 320 321 /* 322 * The following lines calculate how many values are defined for each 323 * of the properties. 324 */ 325 num_pins = pins->length / sizeof(u32); 326 num_funcs = funcs ? (funcs->length / sizeof(u32)) : 0; 327 num_pulls = pulls ? (pulls->length / sizeof(u32)) : 0; 328 329 if (num_funcs > 1 && num_funcs != num_pins) { 330 dev_err(data->dev, "wm,function must have 1 or %d entries\n", 331 num_pins); 332 return -EINVAL; 333 } 334 335 if (num_pulls > 1 && num_pulls != num_pins) { 336 dev_err(data->dev, "wm,pull must have 1 or %d entries\n", 337 num_pins); 338 return -EINVAL; 339 } 340 341 maps_per_pin = 0; 342 if (num_funcs) 343 maps_per_pin++; 344 if (num_pulls) 345 maps_per_pin++; 346 347 cur_map = maps = kcalloc(num_pins * maps_per_pin, sizeof(*maps), 348 GFP_KERNEL); 349 if (!maps) 350 return -ENOMEM; 351 352 for (i = 0; i < num_pins; i++) { 353 err = of_property_read_u32_index(np, "wm,pins", i, &pin); 354 if (err) 355 goto fail; 356 357 if (pin >= (data->nbanks * 32)) { 358 dev_err(data->dev, "invalid wm,pins value\n"); 359 err = -EINVAL; 360 goto fail; 361 } 362 363 if (num_funcs) { 364 err = of_property_read_u32_index(np, "wm,function", 365 (num_funcs > 1 ? i : 0), &func); 366 if (err) 367 goto fail; 368 369 err = wmt_pctl_dt_node_to_map_func(data, np, pin, func, 370 &cur_map); 371 if (err) 372 goto fail; 373 } 374 375 if (num_pulls) { 376 err = of_property_read_u32_index(np, "wm,pull", 377 (num_pulls > 1 ? i : 0), &pull); 378 if (err) 379 goto fail; 380 381 err = wmt_pctl_dt_node_to_map_pull(data, np, pin, pull, 382 &cur_map); 383 if (err) 384 goto fail; 385 } 386 } 387 *map = maps; 388 *num_maps = num_pins * maps_per_pin; 389 return 0; 390 391 /* 392 * The fail path removes any maps that have been allocated. The fail path is 393 * only called from code after maps has been kzalloc'd. It is also safe to 394 * pass 'num_pins * maps_per_pin' as the map count even though we probably 395 * failed before all the mappings were read as all maps are allocated at once, 396 * and configs are only allocated for .type = PIN_MAP_TYPE_CONFIGS_PIN - there 397 * is no failpath where a config can be allocated without .type being set. 398 */ 399 fail: 400 wmt_pctl_dt_free_map(pctldev, maps, num_pins * maps_per_pin); 401 return err; 402 } 403 404 static const struct pinctrl_ops wmt_pctl_ops = { 405 .get_groups_count = wmt_get_groups_count, 406 .get_group_name = wmt_get_group_name, 407 .get_group_pins = wmt_get_group_pins, 408 .dt_node_to_map = wmt_pctl_dt_node_to_map, 409 .dt_free_map = wmt_pctl_dt_free_map, 410 }; 411 412 static int wmt_pinconf_get(struct pinctrl_dev *pctldev, unsigned pin, 413 unsigned long *config) 414 { 415 return -ENOTSUPP; 416 } 417 418 static int wmt_pinconf_set(struct pinctrl_dev *pctldev, unsigned pin, 419 unsigned long *configs, unsigned num_configs) 420 { 421 struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev); 422 enum pin_config_param param; 423 u32 arg; 424 u32 bank = WMT_BANK_FROM_PIN(pin); 425 u32 bit = WMT_BIT_FROM_PIN(pin); 426 u32 reg_pull_en = data->banks[bank].reg_pull_en; 427 u32 reg_pull_cfg = data->banks[bank].reg_pull_cfg; 428 int i; 429 430 if ((reg_pull_en == NO_REG) || (reg_pull_cfg == NO_REG)) { 431 dev_err(data->dev, "bias functions not supported on pin %d\n", 432 pin); 433 return -EINVAL; 434 } 435 436 for (i = 0; i < num_configs; i++) { 437 param = pinconf_to_config_param(configs[i]); 438 arg = pinconf_to_config_argument(configs[i]); 439 440 if ((param == PIN_CONFIG_BIAS_PULL_DOWN) || 441 (param == PIN_CONFIG_BIAS_PULL_UP)) { 442 if (arg == 0) 443 param = PIN_CONFIG_BIAS_DISABLE; 444 } 445 446 switch (param) { 447 case PIN_CONFIG_BIAS_DISABLE: 448 wmt_clearbits(data, reg_pull_en, BIT(bit)); 449 break; 450 case PIN_CONFIG_BIAS_PULL_DOWN: 451 wmt_clearbits(data, reg_pull_cfg, BIT(bit)); 452 wmt_setbits(data, reg_pull_en, BIT(bit)); 453 break; 454 case PIN_CONFIG_BIAS_PULL_UP: 455 wmt_setbits(data, reg_pull_cfg, BIT(bit)); 456 wmt_setbits(data, reg_pull_en, BIT(bit)); 457 break; 458 default: 459 dev_err(data->dev, "unknown pinconf param\n"); 460 return -EINVAL; 461 } 462 } /* for each config */ 463 464 return 0; 465 } 466 467 static const struct pinconf_ops wmt_pinconf_ops = { 468 .pin_config_get = wmt_pinconf_get, 469 .pin_config_set = wmt_pinconf_set, 470 }; 471 472 static struct pinctrl_desc wmt_desc = { 473 .owner = THIS_MODULE, 474 .name = "pinctrl-wmt", 475 .pctlops = &wmt_pctl_ops, 476 .pmxops = &wmt_pinmux_ops, 477 .confops = &wmt_pinconf_ops, 478 }; 479 480 static int wmt_gpio_get_direction(struct gpio_chip *chip, unsigned offset) 481 { 482 struct wmt_pinctrl_data *data = gpiochip_get_data(chip); 483 u32 bank = WMT_BANK_FROM_PIN(offset); 484 u32 bit = WMT_BIT_FROM_PIN(offset); 485 u32 reg_dir = data->banks[bank].reg_dir; 486 u32 val; 487 488 val = readl_relaxed(data->base + reg_dir); 489 if (val & BIT(bit)) 490 return GPIO_LINE_DIRECTION_OUT; 491 492 return GPIO_LINE_DIRECTION_IN; 493 } 494 495 static int wmt_gpio_get_value(struct gpio_chip *chip, unsigned offset) 496 { 497 struct wmt_pinctrl_data *data = gpiochip_get_data(chip); 498 u32 bank = WMT_BANK_FROM_PIN(offset); 499 u32 bit = WMT_BIT_FROM_PIN(offset); 500 u32 reg_data_in = data->banks[bank].reg_data_in; 501 502 if (reg_data_in == NO_REG) { 503 dev_err(data->dev, "no data in register defined\n"); 504 return -EINVAL; 505 } 506 507 return !!(readl_relaxed(data->base + reg_data_in) & BIT(bit)); 508 } 509 510 static void wmt_gpio_set_value(struct gpio_chip *chip, unsigned offset, 511 int val) 512 { 513 struct wmt_pinctrl_data *data = gpiochip_get_data(chip); 514 u32 bank = WMT_BANK_FROM_PIN(offset); 515 u32 bit = WMT_BIT_FROM_PIN(offset); 516 u32 reg_data_out = data->banks[bank].reg_data_out; 517 518 if (reg_data_out == NO_REG) { 519 dev_err(data->dev, "no data out register defined\n"); 520 return; 521 } 522 523 if (val) 524 wmt_setbits(data, reg_data_out, BIT(bit)); 525 else 526 wmt_clearbits(data, reg_data_out, BIT(bit)); 527 } 528 529 static int wmt_gpio_direction_output(struct gpio_chip *chip, unsigned offset, 530 int value) 531 { 532 wmt_gpio_set_value(chip, offset, value); 533 return pinctrl_gpio_direction_output(chip, offset); 534 } 535 536 static const struct gpio_chip wmt_gpio_chip = { 537 .label = "gpio-wmt", 538 .owner = THIS_MODULE, 539 .request = gpiochip_generic_request, 540 .free = gpiochip_generic_free, 541 .get_direction = wmt_gpio_get_direction, 542 .direction_input = pinctrl_gpio_direction_input, 543 .direction_output = wmt_gpio_direction_output, 544 .get = wmt_gpio_get_value, 545 .set = wmt_gpio_set_value, 546 .can_sleep = false, 547 }; 548 549 int wmt_pinctrl_probe(struct platform_device *pdev, 550 struct wmt_pinctrl_data *data) 551 { 552 int err; 553 554 data->base = devm_platform_ioremap_resource(pdev, 0); 555 if (IS_ERR(data->base)) 556 return PTR_ERR(data->base); 557 558 wmt_desc.pins = data->pins; 559 wmt_desc.npins = data->npins; 560 561 data->gpio_chip = wmt_gpio_chip; 562 data->gpio_chip.parent = &pdev->dev; 563 data->gpio_chip.ngpio = data->nbanks * 32; 564 565 platform_set_drvdata(pdev, data); 566 567 data->dev = &pdev->dev; 568 569 data->pctl_dev = devm_pinctrl_register(&pdev->dev, &wmt_desc, data); 570 if (IS_ERR(data->pctl_dev)) { 571 dev_err(&pdev->dev, "Failed to register pinctrl\n"); 572 return PTR_ERR(data->pctl_dev); 573 } 574 575 err = gpiochip_add_data(&data->gpio_chip, data); 576 if (err) { 577 dev_err(&pdev->dev, "could not add GPIO chip\n"); 578 return err; 579 } 580 581 err = gpiochip_add_pin_range(&data->gpio_chip, dev_name(data->dev), 582 0, 0, data->nbanks * 32); 583 if (err) 584 goto fail_range; 585 586 dev_info(&pdev->dev, "Pin controller initialized\n"); 587 588 return 0; 589 590 fail_range: 591 gpiochip_remove(&data->gpio_chip); 592 return err; 593 } 594