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