1 /* 2 * Pinctrl driver for the Wondermedia SoC's 3 * 4 * Copyright (c) 2013 Tony Prisk <linux@prisktech.co.nz> 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms and conditions of the GNU General Public License, 8 * version 2, as published by the Free Software Foundation. 9 * 10 * This program is distributed in the hope it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 13 * more details. 14 */ 15 16 #include <linux/err.h> 17 #include <linux/gpio.h> 18 #include <linux/interrupt.h> 19 #include <linux/io.h> 20 #include <linux/irq.h> 21 #include <linux/module.h> 22 #include <linux/of.h> 23 #include <linux/of_irq.h> 24 #include <linux/pinctrl/consumer.h> 25 #include <linux/pinctrl/machine.h> 26 #include <linux/pinctrl/pinconf.h> 27 #include <linux/pinctrl/pinconf-generic.h> 28 #include <linux/pinctrl/pinctrl.h> 29 #include <linux/pinctrl/pinmux.h> 30 #include <linux/platform_device.h> 31 #include <linux/slab.h> 32 33 #include "pinctrl-wmt.h" 34 35 static inline void wmt_setbits(struct wmt_pinctrl_data *data, u32 reg, 36 u32 mask) 37 { 38 u32 val; 39 40 val = readl_relaxed(data->base + reg); 41 val |= mask; 42 writel_relaxed(val, data->base + reg); 43 } 44 45 static inline void wmt_clearbits(struct wmt_pinctrl_data *data, u32 reg, 46 u32 mask) 47 { 48 u32 val; 49 50 val = readl_relaxed(data->base + reg); 51 val &= ~mask; 52 writel_relaxed(val, data->base + reg); 53 } 54 55 enum wmt_func_sel { 56 WMT_FSEL_GPIO_IN = 0, 57 WMT_FSEL_GPIO_OUT = 1, 58 WMT_FSEL_ALT = 2, 59 WMT_FSEL_COUNT = 3, 60 }; 61 62 static const char * const wmt_functions[WMT_FSEL_COUNT] = { 63 [WMT_FSEL_GPIO_IN] = "gpio_in", 64 [WMT_FSEL_GPIO_OUT] = "gpio_out", 65 [WMT_FSEL_ALT] = "alt", 66 }; 67 68 static int wmt_pmx_get_functions_count(struct pinctrl_dev *pctldev) 69 { 70 return WMT_FSEL_COUNT; 71 } 72 73 static const char *wmt_pmx_get_function_name(struct pinctrl_dev *pctldev, 74 unsigned selector) 75 { 76 return wmt_functions[selector]; 77 } 78 79 static int wmt_pmx_get_function_groups(struct pinctrl_dev *pctldev, 80 unsigned selector, 81 const char * const **groups, 82 unsigned * const num_groups) 83 { 84 struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev); 85 86 /* every pin does every function */ 87 *groups = data->groups; 88 *num_groups = data->ngroups; 89 90 return 0; 91 } 92 93 static int wmt_set_pinmux(struct wmt_pinctrl_data *data, unsigned func, 94 unsigned pin) 95 { 96 u32 bank = WMT_BANK_FROM_PIN(pin); 97 u32 bit = WMT_BIT_FROM_PIN(pin); 98 u32 reg_en = data->banks[bank].reg_en; 99 u32 reg_dir = data->banks[bank].reg_dir; 100 101 if (reg_dir == NO_REG) { 102 dev_err(data->dev, "pin:%d no direction register defined\n", 103 pin); 104 return -EINVAL; 105 } 106 107 /* 108 * If reg_en == NO_REG, we assume it is a dedicated GPIO and cannot be 109 * disabled (as on VT8500) and that no alternate function is available. 110 */ 111 switch (func) { 112 case WMT_FSEL_GPIO_IN: 113 if (reg_en != NO_REG) 114 wmt_setbits(data, reg_en, BIT(bit)); 115 wmt_clearbits(data, reg_dir, BIT(bit)); 116 break; 117 case WMT_FSEL_GPIO_OUT: 118 if (reg_en != NO_REG) 119 wmt_setbits(data, reg_en, BIT(bit)); 120 wmt_setbits(data, reg_dir, BIT(bit)); 121 break; 122 case WMT_FSEL_ALT: 123 if (reg_en == NO_REG) { 124 dev_err(data->dev, "pin:%d no alt function available\n", 125 pin); 126 return -EINVAL; 127 } 128 wmt_clearbits(data, reg_en, BIT(bit)); 129 } 130 131 return 0; 132 } 133 134 static int wmt_pmx_enable(struct pinctrl_dev *pctldev, 135 unsigned func_selector, 136 unsigned group_selector) 137 { 138 struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev); 139 u32 pinnum = data->pins[group_selector].number; 140 141 return wmt_set_pinmux(data, func_selector, pinnum); 142 } 143 144 static void wmt_pmx_disable(struct pinctrl_dev *pctldev, 145 unsigned func_selector, 146 unsigned group_selector) 147 { 148 struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev); 149 u32 pinnum = data->pins[group_selector].number; 150 151 /* disable by setting GPIO_IN */ 152 wmt_set_pinmux(data, WMT_FSEL_GPIO_IN, pinnum); 153 } 154 155 static void wmt_pmx_gpio_disable_free(struct pinctrl_dev *pctldev, 156 struct pinctrl_gpio_range *range, 157 unsigned offset) 158 { 159 struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev); 160 161 /* disable by setting GPIO_IN */ 162 wmt_set_pinmux(data, WMT_FSEL_GPIO_IN, offset); 163 } 164 165 static int wmt_pmx_gpio_set_direction(struct pinctrl_dev *pctldev, 166 struct pinctrl_gpio_range *range, 167 unsigned offset, 168 bool input) 169 { 170 struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev); 171 172 wmt_set_pinmux(data, (input ? WMT_FSEL_GPIO_IN : WMT_FSEL_GPIO_OUT), 173 offset); 174 175 return 0; 176 } 177 178 static struct pinmux_ops wmt_pinmux_ops = { 179 .get_functions_count = wmt_pmx_get_functions_count, 180 .get_function_name = wmt_pmx_get_function_name, 181 .get_function_groups = wmt_pmx_get_function_groups, 182 .enable = wmt_pmx_enable, 183 .disable = wmt_pmx_disable, 184 .gpio_disable_free = wmt_pmx_gpio_disable_free, 185 .gpio_set_direction = wmt_pmx_gpio_set_direction, 186 }; 187 188 static int wmt_get_groups_count(struct pinctrl_dev *pctldev) 189 { 190 struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev); 191 192 return data->ngroups; 193 } 194 195 static const char *wmt_get_group_name(struct pinctrl_dev *pctldev, 196 unsigned selector) 197 { 198 struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev); 199 200 return data->groups[selector]; 201 } 202 203 static int wmt_get_group_pins(struct pinctrl_dev *pctldev, 204 unsigned selector, 205 const unsigned **pins, 206 unsigned *num_pins) 207 { 208 struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev); 209 210 *pins = &data->pins[selector].number; 211 *num_pins = 1; 212 213 return 0; 214 } 215 216 static int wmt_pctl_find_group_by_pin(struct wmt_pinctrl_data *data, u32 pin) 217 { 218 int i; 219 220 for (i = 0; i < data->npins; i++) { 221 if (data->pins[i].number == pin) 222 return i; 223 } 224 225 return -EINVAL; 226 } 227 228 static int wmt_pctl_dt_node_to_map_func(struct wmt_pinctrl_data *data, 229 struct device_node *np, 230 u32 pin, u32 fnum, 231 struct pinctrl_map **maps) 232 { 233 int group; 234 struct pinctrl_map *map = *maps; 235 236 if (fnum >= ARRAY_SIZE(wmt_functions)) { 237 dev_err(data->dev, "invalid wm,function %d\n", fnum); 238 return -EINVAL; 239 } 240 241 group = wmt_pctl_find_group_by_pin(data, pin); 242 if (group < 0) { 243 dev_err(data->dev, "unable to match pin %d to group\n", pin); 244 return group; 245 } 246 247 map->type = PIN_MAP_TYPE_MUX_GROUP; 248 map->data.mux.group = data->groups[group]; 249 map->data.mux.function = wmt_functions[fnum]; 250 (*maps)++; 251 252 return 0; 253 } 254 255 static int wmt_pctl_dt_node_to_map_pull(struct wmt_pinctrl_data *data, 256 struct device_node *np, 257 u32 pin, u32 pull, 258 struct pinctrl_map **maps) 259 { 260 int group; 261 unsigned long *configs; 262 struct pinctrl_map *map = *maps; 263 264 if (pull > 2) { 265 dev_err(data->dev, "invalid wm,pull %d\n", pull); 266 return -EINVAL; 267 } 268 269 group = wmt_pctl_find_group_by_pin(data, pin); 270 if (group < 0) { 271 dev_err(data->dev, "unable to match pin %d to group\n", pin); 272 return group; 273 } 274 275 configs = kzalloc(sizeof(*configs), GFP_KERNEL); 276 if (!configs) 277 return -ENOMEM; 278 279 configs[0] = pull; 280 281 map->type = PIN_MAP_TYPE_CONFIGS_PIN; 282 map->data.configs.group_or_pin = data->groups[group]; 283 map->data.configs.configs = configs; 284 map->data.configs.num_configs = 1; 285 (*maps)++; 286 287 return 0; 288 } 289 290 static void wmt_pctl_dt_free_map(struct pinctrl_dev *pctldev, 291 struct pinctrl_map *maps, 292 unsigned num_maps) 293 { 294 int i; 295 296 for (i = 0; i < num_maps; i++) 297 if (maps[i].type == PIN_MAP_TYPE_CONFIGS_PIN) 298 kfree(maps[i].data.configs.configs); 299 300 kfree(maps); 301 } 302 303 static int wmt_pctl_dt_node_to_map(struct pinctrl_dev *pctldev, 304 struct device_node *np, 305 struct pinctrl_map **map, 306 unsigned *num_maps) 307 { 308 struct pinctrl_map *maps, *cur_map; 309 struct property *pins, *funcs, *pulls; 310 u32 pin, func, pull; 311 int num_pins, num_funcs, num_pulls, maps_per_pin; 312 int i, err; 313 struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev); 314 315 pins = of_find_property(np, "wm,pins", NULL); 316 if (!pins) { 317 dev_err(data->dev, "missing wmt,pins property\n"); 318 return -EINVAL; 319 } 320 321 funcs = of_find_property(np, "wm,function", NULL); 322 pulls = of_find_property(np, "wm,pull", NULL); 323 324 if (!funcs && !pulls) { 325 dev_err(data->dev, "neither wm,function nor wm,pull specified\n"); 326 return -EINVAL; 327 } 328 329 /* 330 * The following lines calculate how many values are defined for each 331 * of the properties. 332 */ 333 num_pins = pins->length / sizeof(u32); 334 num_funcs = funcs ? (funcs->length / sizeof(u32)) : 0; 335 num_pulls = pulls ? (pulls->length / sizeof(u32)) : 0; 336 337 if (num_funcs > 1 && num_funcs != num_pins) { 338 dev_err(data->dev, "wm,function must have 1 or %d entries\n", 339 num_pins); 340 return -EINVAL; 341 } 342 343 if (num_pulls > 1 && num_pulls != num_pins) { 344 dev_err(data->dev, "wm,pull must have 1 or %d entries\n", 345 num_pins); 346 return -EINVAL; 347 } 348 349 maps_per_pin = 0; 350 if (num_funcs) 351 maps_per_pin++; 352 if (num_pulls) 353 maps_per_pin++; 354 355 cur_map = maps = kzalloc(num_pins * maps_per_pin * sizeof(*maps), 356 GFP_KERNEL); 357 if (!maps) 358 return -ENOMEM; 359 360 for (i = 0; i < num_pins; i++) { 361 err = of_property_read_u32_index(np, "wm,pins", i, &pin); 362 if (err) 363 goto fail; 364 365 if (pin >= (data->nbanks * 32)) { 366 dev_err(data->dev, "invalid wm,pins value\n"); 367 err = -EINVAL; 368 goto fail; 369 } 370 371 if (num_funcs) { 372 err = of_property_read_u32_index(np, "wm,function", 373 (num_funcs > 1 ? i : 0), &func); 374 if (err) 375 goto fail; 376 377 err = wmt_pctl_dt_node_to_map_func(data, np, pin, func, 378 &cur_map); 379 if (err) 380 goto fail; 381 } 382 383 if (num_pulls) { 384 err = of_property_read_u32_index(np, "wm,pull", 385 (num_pulls > 1 ? i : 0), &pull); 386 if (err) 387 goto fail; 388 389 err = wmt_pctl_dt_node_to_map_pull(data, np, pin, pull, 390 &cur_map); 391 if (err) 392 goto fail; 393 } 394 } 395 *map = maps; 396 *num_maps = num_pins * maps_per_pin; 397 return 0; 398 399 /* 400 * The fail path removes any maps that have been allocated. The fail path is 401 * only called from code after maps has been kzalloc'd. It is also safe to 402 * pass 'num_pins * maps_per_pin' as the map count even though we probably 403 * failed before all the mappings were read as all maps are allocated at once, 404 * and configs are only allocated for .type = PIN_MAP_TYPE_CONFIGS_PIN - there 405 * is no failpath where a config can be allocated without .type being set. 406 */ 407 fail: 408 wmt_pctl_dt_free_map(pctldev, maps, num_pins * maps_per_pin); 409 return err; 410 } 411 412 static struct pinctrl_ops wmt_pctl_ops = { 413 .get_groups_count = wmt_get_groups_count, 414 .get_group_name = wmt_get_group_name, 415 .get_group_pins = wmt_get_group_pins, 416 .dt_node_to_map = wmt_pctl_dt_node_to_map, 417 .dt_free_map = wmt_pctl_dt_free_map, 418 }; 419 420 static int wmt_pinconf_get(struct pinctrl_dev *pctldev, unsigned pin, 421 unsigned long *config) 422 { 423 return -ENOTSUPP; 424 } 425 426 static int wmt_pinconf_set(struct pinctrl_dev *pctldev, unsigned pin, 427 unsigned long config) 428 { 429 struct wmt_pinctrl_data *data = pinctrl_dev_get_drvdata(pctldev); 430 enum pin_config_param param = pinconf_to_config_param(config); 431 u16 arg = pinconf_to_config_argument(config); 432 u32 bank = WMT_BANK_FROM_PIN(pin); 433 u32 bit = WMT_BIT_FROM_PIN(pin); 434 u32 reg_pull_en = data->banks[bank].reg_pull_en; 435 u32 reg_pull_cfg = data->banks[bank].reg_pull_cfg; 436 437 if ((reg_pull_en == NO_REG) || (reg_pull_cfg == NO_REG)) { 438 dev_err(data->dev, "bias functions not supported on pin %d\n", 439 pin); 440 return -EINVAL; 441 } 442 443 if ((param == PIN_CONFIG_BIAS_PULL_DOWN) || 444 (param == PIN_CONFIG_BIAS_PULL_UP)) { 445 if (arg == 0) 446 param = PIN_CONFIG_BIAS_DISABLE; 447 } 448 449 switch (param) { 450 case PIN_CONFIG_BIAS_DISABLE: 451 wmt_clearbits(data, reg_pull_en, BIT(bit)); 452 break; 453 case PIN_CONFIG_BIAS_PULL_DOWN: 454 wmt_clearbits(data, reg_pull_cfg, BIT(bit)); 455 wmt_setbits(data, reg_pull_en, BIT(bit)); 456 break; 457 case PIN_CONFIG_BIAS_PULL_UP: 458 wmt_setbits(data, reg_pull_cfg, BIT(bit)); 459 wmt_setbits(data, reg_pull_en, BIT(bit)); 460 break; 461 default: 462 dev_err(data->dev, "unknown pinconf param\n"); 463 return -EINVAL; 464 } 465 466 return 0; 467 } 468 469 static struct pinconf_ops wmt_pinconf_ops = { 470 .pin_config_get = wmt_pinconf_get, 471 .pin_config_set = wmt_pinconf_set, 472 }; 473 474 static struct pinctrl_desc wmt_desc = { 475 .owner = THIS_MODULE, 476 .name = "pinctrl-wmt", 477 .pctlops = &wmt_pctl_ops, 478 .pmxops = &wmt_pinmux_ops, 479 .confops = &wmt_pinconf_ops, 480 }; 481 482 static int wmt_gpio_request(struct gpio_chip *chip, unsigned offset) 483 { 484 return pinctrl_request_gpio(chip->base + offset); 485 } 486 487 static void wmt_gpio_free(struct gpio_chip *chip, unsigned offset) 488 { 489 pinctrl_free_gpio(chip->base + offset); 490 } 491 492 static int wmt_gpio_get_direction(struct gpio_chip *chip, unsigned offset) 493 { 494 struct wmt_pinctrl_data *data = dev_get_drvdata(chip->dev); 495 u32 bank = WMT_BANK_FROM_PIN(offset); 496 u32 bit = WMT_BIT_FROM_PIN(offset); 497 u32 reg_dir = data->banks[bank].reg_dir; 498 u32 val; 499 500 val = readl_relaxed(data->base + reg_dir); 501 if (val & BIT(bit)) 502 return GPIOF_DIR_OUT; 503 else 504 return GPIOF_DIR_IN; 505 } 506 507 static int wmt_gpio_direction_input(struct gpio_chip *chip, unsigned offset) 508 { 509 return pinctrl_gpio_direction_input(chip->base + offset); 510 } 511 512 static int wmt_gpio_direction_output(struct gpio_chip *chip, unsigned offset, 513 int value) 514 { 515 return pinctrl_gpio_direction_output(chip->base + offset); 516 } 517 518 static int wmt_gpio_get_value(struct gpio_chip *chip, unsigned offset) 519 { 520 struct wmt_pinctrl_data *data = dev_get_drvdata(chip->dev); 521 u32 bank = WMT_BANK_FROM_PIN(offset); 522 u32 bit = WMT_BIT_FROM_PIN(offset); 523 u32 reg_data_in = data->banks[bank].reg_data_in; 524 525 if (reg_data_in == NO_REG) { 526 dev_err(data->dev, "no data in register defined\n"); 527 return -EINVAL; 528 } 529 530 return !!(readl_relaxed(data->base + reg_data_in) & BIT(bit)); 531 } 532 533 static void wmt_gpio_set_value(struct gpio_chip *chip, unsigned offset, 534 int val) 535 { 536 struct wmt_pinctrl_data *data = dev_get_drvdata(chip->dev); 537 u32 bank = WMT_BANK_FROM_PIN(offset); 538 u32 bit = WMT_BIT_FROM_PIN(offset); 539 u32 reg_data_out = data->banks[bank].reg_data_out; 540 541 if (reg_data_out == NO_REG) { 542 dev_err(data->dev, "no data out register defined\n"); 543 return; 544 } 545 546 if (val) 547 wmt_setbits(data, reg_data_out, BIT(bit)); 548 else 549 wmt_clearbits(data, reg_data_out, BIT(bit)); 550 } 551 552 static struct gpio_chip wmt_gpio_chip = { 553 .label = "gpio-wmt", 554 .owner = THIS_MODULE, 555 .request = wmt_gpio_request, 556 .free = wmt_gpio_free, 557 .get_direction = wmt_gpio_get_direction, 558 .direction_input = wmt_gpio_direction_input, 559 .direction_output = wmt_gpio_direction_output, 560 .get = wmt_gpio_get_value, 561 .set = wmt_gpio_set_value, 562 .can_sleep = 0, 563 }; 564 565 int wmt_pinctrl_probe(struct platform_device *pdev, 566 struct wmt_pinctrl_data *data) 567 { 568 int err; 569 struct resource *res; 570 571 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 572 data->base = devm_request_and_ioremap(&pdev->dev, res); 573 if (!data->base) { 574 dev_err(&pdev->dev, "failed to map memory resource\n"); 575 return -EBUSY; 576 } 577 578 wmt_desc.pins = data->pins; 579 wmt_desc.npins = data->npins; 580 581 data->gpio_chip = wmt_gpio_chip; 582 data->gpio_chip.dev = &pdev->dev; 583 data->gpio_chip.of_node = pdev->dev.of_node; 584 data->gpio_chip.ngpio = data->nbanks * 32; 585 586 platform_set_drvdata(pdev, data); 587 588 data->dev = &pdev->dev; 589 590 data->pctl_dev = pinctrl_register(&wmt_desc, &pdev->dev, data); 591 if (!data->pctl_dev) { 592 dev_err(&pdev->dev, "Failed to register pinctrl\n"); 593 return -EINVAL; 594 } 595 596 err = gpiochip_add(&data->gpio_chip); 597 if (err) { 598 dev_err(&pdev->dev, "could not add GPIO chip\n"); 599 goto fail_gpio; 600 } 601 602 err = gpiochip_add_pin_range(&data->gpio_chip, dev_name(data->dev), 603 0, 0, data->nbanks * 32); 604 if (err) 605 goto fail_range; 606 607 dev_info(&pdev->dev, "Pin controller initialized\n"); 608 609 return 0; 610 611 fail_range: 612 err = gpiochip_remove(&data->gpio_chip); 613 if (err) 614 dev_err(&pdev->dev, "failed to remove gpio chip\n"); 615 fail_gpio: 616 pinctrl_unregister(data->pctl_dev); 617 return err; 618 } 619 620 int wmt_pinctrl_remove(struct platform_device *pdev) 621 { 622 struct wmt_pinctrl_data *data = platform_get_drvdata(pdev); 623 int err; 624 625 err = gpiochip_remove(&data->gpio_chip); 626 if (err) 627 dev_err(&pdev->dev, "failed to remove gpio chip\n"); 628 629 pinctrl_unregister(data->pctl_dev); 630 631 return 0; 632 } 633