Pascal Paillet | 79503b8 | 2020-12-15 18:26:39 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2021, STMicroelectronics - All Rights Reserved |
| 3 | * |
| 4 | * SPDX-License-Identifier: BSD-3-Clause |
| 5 | */ |
| 6 | |
| 7 | #include <assert.h> |
| 8 | #include <errno.h> |
| 9 | #include <limits.h> |
| 10 | #include <stdint.h> |
| 11 | #include <string.h> |
| 12 | |
| 13 | #include <common/debug.h> |
| 14 | #include <drivers/delay_timer.h> |
| 15 | #include <drivers/st/regulator.h> |
| 16 | #include <libfdt.h> |
| 17 | |
| 18 | #define MAX_PROPERTY_LEN 64 |
| 19 | |
| 20 | static struct rdev rdev_array[PLAT_NB_RDEVS]; |
| 21 | |
| 22 | #define for_each_rdev(rdev) \ |
| 23 | for (rdev = rdev_array; rdev < (rdev_array + PLAT_NB_RDEVS); rdev++) |
| 24 | |
| 25 | #define for_each_registered_rdev(rdev) \ |
| 26 | for (rdev = rdev_array; \ |
| 27 | (rdev < (rdev_array + PLAT_NB_RDEVS)) && (rdev->desc != NULL); rdev++) |
| 28 | |
| 29 | static void lock_driver(const struct rdev *rdev) |
| 30 | { |
| 31 | if (rdev->desc->ops->lock != NULL) { |
| 32 | rdev->desc->ops->lock(rdev->desc); |
| 33 | } |
| 34 | } |
| 35 | |
| 36 | static void unlock_driver(const struct rdev *rdev) |
| 37 | { |
| 38 | if (rdev->desc->ops->unlock != NULL) { |
| 39 | rdev->desc->ops->unlock(rdev->desc); |
| 40 | } |
| 41 | } |
| 42 | |
| 43 | static struct rdev *regulator_get_by_phandle(int32_t phandle) |
| 44 | { |
| 45 | struct rdev *rdev; |
| 46 | |
| 47 | for_each_registered_rdev(rdev) { |
| 48 | if (rdev->phandle == phandle) { |
| 49 | return rdev; |
| 50 | } |
| 51 | } |
| 52 | |
| 53 | WARN("%s: phandle %d not found\n", __func__, phandle); |
| 54 | return NULL; |
| 55 | } |
| 56 | |
| 57 | /* |
| 58 | * Get a regulator from its node name |
| 59 | * |
| 60 | * @fdt - pointer to device tree memory |
| 61 | * @node_name - name of the node "ldo1" |
| 62 | * Return pointer to rdev if succeed, NULL else. |
| 63 | */ |
| 64 | struct rdev *regulator_get_by_name(const char *node_name) |
| 65 | { |
| 66 | struct rdev *rdev; |
| 67 | |
| 68 | assert(node_name != NULL); |
| 69 | VERBOSE("get %s\n", node_name); |
| 70 | |
| 71 | for_each_registered_rdev(rdev) { |
| 72 | if (strcmp(rdev->desc->node_name, node_name) == 0) { |
| 73 | return rdev; |
| 74 | } |
| 75 | } |
| 76 | |
| 77 | WARN("%s: %s not found\n", __func__, node_name); |
| 78 | return NULL; |
| 79 | } |
| 80 | |
| 81 | static int32_t get_supply_phandle(const void *fdt, int node, const char *name) |
| 82 | { |
| 83 | const fdt32_t *cuint; |
| 84 | int len __unused; |
| 85 | int supply_phandle = -FDT_ERR_NOTFOUND; |
| 86 | char prop_name[MAX_PROPERTY_LEN]; |
| 87 | |
| 88 | len = snprintf(prop_name, MAX_PROPERTY_LEN - 1, "%s-supply", name); |
| 89 | assert((len >= 0) && (len < MAX_PROPERTY_LEN - 1)); |
| 90 | |
| 91 | cuint = fdt_getprop(fdt, node, prop_name, NULL); |
| 92 | if (cuint != NULL) { |
| 93 | supply_phandle = fdt32_to_cpu(*cuint); |
| 94 | VERBOSE("%s: supplied by %d\n", name, supply_phandle); |
| 95 | } |
| 96 | |
| 97 | return supply_phandle; |
| 98 | } |
| 99 | |
| 100 | /* |
| 101 | * Get a regulator from a supply name |
| 102 | * |
| 103 | * @fdt - pointer to device tree memory |
| 104 | * @node - offset of the node that contains the supply description |
| 105 | * @name - name of the supply "vdd" for "vdd-supply' |
| 106 | * Return pointer to rdev if succeed, NULL else. |
| 107 | */ |
| 108 | struct rdev *regulator_get_by_supply_name(const void *fdt, int node, const char *name) |
| 109 | { |
| 110 | const int p = get_supply_phandle(fdt, node, name); |
| 111 | |
| 112 | if (p < 0) { |
| 113 | return NULL; |
| 114 | } |
| 115 | |
| 116 | return regulator_get_by_phandle(p); |
| 117 | } |
| 118 | |
| 119 | static int __regulator_set_state(struct rdev *rdev, bool state) |
| 120 | { |
| 121 | if (rdev->desc->ops->set_state == NULL) { |
| 122 | return -ENODEV; |
| 123 | } |
| 124 | |
| 125 | return rdev->desc->ops->set_state(rdev->desc, state); |
| 126 | } |
| 127 | |
| 128 | /* |
| 129 | * Enable regulator |
| 130 | * |
| 131 | * @rdev - pointer to rdev struct |
| 132 | * Return 0 if succeed, non 0 else. |
| 133 | */ |
| 134 | int regulator_enable(struct rdev *rdev) |
| 135 | { |
| 136 | int ret; |
| 137 | |
| 138 | assert(rdev != NULL); |
| 139 | |
| 140 | ret = __regulator_set_state(rdev, STATE_ENABLE); |
| 141 | |
| 142 | udelay(rdev->enable_ramp_delay); |
| 143 | |
| 144 | return ret; |
| 145 | } |
| 146 | |
| 147 | /* |
| 148 | * Disable regulator |
| 149 | * |
| 150 | * @rdev - pointer to rdev struct |
| 151 | * Return 0 if succeed, non 0 else. |
| 152 | */ |
| 153 | int regulator_disable(struct rdev *rdev) |
| 154 | { |
| 155 | int ret; |
| 156 | |
| 157 | assert(rdev != NULL); |
| 158 | |
| 159 | ret = __regulator_set_state(rdev, STATE_DISABLE); |
| 160 | |
| 161 | udelay(rdev->enable_ramp_delay); |
| 162 | |
| 163 | return ret; |
| 164 | } |
| 165 | |
| 166 | /* |
| 167 | * Regulator enabled query |
| 168 | * |
| 169 | * @rdev - pointer to rdev struct |
| 170 | * Return 0 if disabled, 1 if enabled, <0 else. |
| 171 | */ |
| 172 | int regulator_is_enabled(const struct rdev *rdev) |
| 173 | { |
| 174 | int ret; |
| 175 | |
| 176 | assert(rdev != NULL); |
| 177 | |
| 178 | VERBOSE("%s: is en\n", rdev->desc->node_name); |
| 179 | |
| 180 | if (rdev->desc->ops->get_state == NULL) { |
| 181 | return -ENODEV; |
| 182 | } |
| 183 | |
| 184 | lock_driver(rdev); |
| 185 | |
| 186 | ret = rdev->desc->ops->get_state(rdev->desc); |
| 187 | if (ret < 0) { |
| 188 | ERROR("regul %s get state failed: err:%d\n", |
| 189 | rdev->desc->node_name, ret); |
| 190 | } |
| 191 | |
| 192 | unlock_driver(rdev); |
| 193 | |
| 194 | return ret; |
| 195 | } |
| 196 | |
| 197 | /* |
| 198 | * Set regulator voltage |
| 199 | * |
| 200 | * @rdev - pointer to rdev struct |
| 201 | * @mvolt - Target voltage level in millivolt |
| 202 | * Return 0 if succeed, non 0 else. |
| 203 | */ |
| 204 | int regulator_set_voltage(struct rdev *rdev, uint16_t mvolt) |
| 205 | { |
| 206 | int ret; |
| 207 | |
| 208 | assert(rdev != NULL); |
| 209 | |
| 210 | VERBOSE("%s: set mvolt\n", rdev->desc->node_name); |
| 211 | |
| 212 | if (rdev->desc->ops->set_voltage == NULL) { |
| 213 | return -ENODEV; |
| 214 | } |
| 215 | |
| 216 | if ((mvolt < rdev->min_mv) || (mvolt > rdev->max_mv)) { |
| 217 | return -EPERM; |
| 218 | } |
| 219 | |
| 220 | lock_driver(rdev); |
| 221 | |
| 222 | ret = rdev->desc->ops->set_voltage(rdev->desc, mvolt); |
| 223 | if (ret < 0) { |
| 224 | ERROR("regul %s set volt failed: err:%d\n", |
| 225 | rdev->desc->node_name, ret); |
| 226 | } |
| 227 | |
| 228 | unlock_driver(rdev); |
| 229 | |
| 230 | return ret; |
| 231 | } |
| 232 | |
| 233 | /* |
| 234 | * Set regulator min voltage |
| 235 | * |
| 236 | * @rdev - pointer to rdev struct |
| 237 | * Return 0 if succeed, non 0 else. |
| 238 | */ |
| 239 | int regulator_set_min_voltage(struct rdev *rdev) |
| 240 | { |
| 241 | return regulator_set_voltage(rdev, rdev->min_mv); |
| 242 | } |
| 243 | |
| 244 | /* |
| 245 | * Get regulator voltage |
| 246 | * |
| 247 | * @rdev - pointer to rdev struct |
| 248 | * Return milli volts if succeed, <0 else. |
| 249 | */ |
| 250 | int regulator_get_voltage(const struct rdev *rdev) |
| 251 | { |
| 252 | int ret; |
| 253 | |
| 254 | assert(rdev != NULL); |
| 255 | |
| 256 | VERBOSE("%s: get volt\n", rdev->desc->node_name); |
| 257 | |
| 258 | if (rdev->desc->ops->get_voltage == NULL) { |
| 259 | return rdev->min_mv; |
| 260 | } |
| 261 | |
| 262 | lock_driver(rdev); |
| 263 | |
| 264 | ret = rdev->desc->ops->get_voltage(rdev->desc); |
| 265 | if (ret < 0) { |
| 266 | ERROR("regul %s get voltage failed: err:%d\n", |
| 267 | rdev->desc->node_name, ret); |
| 268 | } |
| 269 | |
| 270 | unlock_driver(rdev); |
| 271 | |
| 272 | return ret; |
| 273 | } |
| 274 | |
| 275 | /* |
| 276 | * List regulator voltages |
| 277 | * |
| 278 | * @rdev - pointer to rdev struct |
| 279 | * @levels - out: array of supported millitvolt levels from min to max value |
| 280 | * @count - out: number of possible millivolt values |
| 281 | * Return 0 if succeed, non 0 else. |
| 282 | */ |
| 283 | int regulator_list_voltages(const struct rdev *rdev, const uint16_t **levels, size_t *count) |
| 284 | { |
| 285 | int ret; |
| 286 | size_t n; |
| 287 | |
| 288 | assert(rdev != NULL); |
| 289 | assert(levels != NULL); |
| 290 | assert(count != NULL); |
| 291 | |
| 292 | VERBOSE("%s: list volt\n", rdev->desc->node_name); |
| 293 | |
| 294 | if (rdev->desc->ops->list_voltages == NULL) { |
| 295 | return -ENODEV; |
| 296 | } |
| 297 | |
| 298 | lock_driver(rdev); |
| 299 | |
| 300 | ret = rdev->desc->ops->list_voltages(rdev->desc, levels, count); |
| 301 | |
| 302 | unlock_driver(rdev); |
| 303 | |
| 304 | if (ret < 0) { |
| 305 | ERROR("regul %s list_voltages failed: err: %d\n", |
| 306 | rdev->desc->node_name, ret); |
| 307 | return ret; |
| 308 | } |
| 309 | |
| 310 | /* |
| 311 | * Reduce the possible values depending on min and max from device-tree |
| 312 | */ |
| 313 | n = *count; |
| 314 | while ((n > 1U) && ((*levels)[n - 1U] > rdev->max_mv)) { |
| 315 | n--; |
| 316 | } |
| 317 | |
| 318 | /* Verify that max val is a valid value */ |
| 319 | if (rdev->max_mv != (*levels)[n - 1]) { |
| 320 | ERROR("regul %s: max value %u is invalid\n", |
| 321 | rdev->desc->node_name, rdev->max_mv); |
| 322 | return -EINVAL; |
| 323 | } |
| 324 | |
| 325 | while ((n > 1U) && ((*levels[0U]) < rdev->min_mv)) { |
| 326 | (*levels)++; |
| 327 | n--; |
| 328 | } |
| 329 | |
| 330 | /* Verify that min is not too high */ |
| 331 | if (n == 0U) { |
| 332 | ERROR("regul %s set min voltage is too high\n", |
| 333 | rdev->desc->node_name); |
| 334 | return -EINVAL; |
| 335 | } |
| 336 | |
| 337 | /* Verify that min val is a valid vlue */ |
| 338 | if (rdev->min_mv != (*levels)[0U]) { |
| 339 | ERROR("regul %s: min value %u is invalid\n", |
| 340 | rdev->desc->node_name, rdev->min_mv); |
| 341 | return -EINVAL; |
| 342 | } |
| 343 | |
| 344 | *count = n; |
| 345 | |
| 346 | VERBOSE("rdev->min_mv=%u rdev->max_mv=%u\n", rdev->min_mv, rdev->max_mv); |
| 347 | |
| 348 | return 0; |
| 349 | } |
| 350 | |
| 351 | /* |
| 352 | * Get regulator voltages range |
| 353 | * |
| 354 | * @rdev - pointer to rdev struct |
| 355 | * @min_mv - out: min possible millivolt value |
| 356 | * @max_mv - out: max possible millivolt value |
| 357 | * Return 0 if succeed, non 0 else. |
| 358 | */ |
| 359 | void regulator_get_range(const struct rdev *rdev, uint16_t *min_mv, uint16_t *max_mv) |
| 360 | { |
| 361 | assert(rdev != NULL); |
| 362 | |
| 363 | if (min_mv != NULL) { |
| 364 | *min_mv = rdev->min_mv; |
| 365 | } |
| 366 | if (max_mv != NULL) { |
| 367 | *max_mv = rdev->max_mv; |
| 368 | } |
| 369 | } |
| 370 | |
| 371 | /* |
| 372 | * Set regulator flag |
| 373 | * |
| 374 | * @rdev - pointer to rdev struct |
| 375 | * @flag - flag value to set (eg: REGUL_OCP) |
| 376 | * Return 0 if succeed, non 0 else. |
| 377 | */ |
| 378 | int regulator_set_flag(struct rdev *rdev, uint16_t flag) |
| 379 | { |
| 380 | int ret; |
| 381 | |
| 382 | /* check that only one bit is set on flag */ |
| 383 | if (__builtin_popcount(flag) != 1) { |
| 384 | return -EINVAL; |
| 385 | } |
| 386 | |
| 387 | /* REGUL_ALWAYS_ON and REGUL_BOOT_ON are internal properties of the core */ |
| 388 | if ((flag == REGUL_ALWAYS_ON) || (flag == REGUL_BOOT_ON)) { |
| 389 | rdev->flags |= flag; |
| 390 | return 0; |
| 391 | } |
| 392 | |
| 393 | if (rdev->desc->ops->set_flag == NULL) { |
| 394 | ERROR("%s can not set any flag\n", rdev->desc->node_name); |
| 395 | return -ENODEV; |
| 396 | } |
| 397 | |
| 398 | lock_driver(rdev); |
| 399 | |
| 400 | ret = rdev->desc->ops->set_flag(rdev->desc, flag); |
| 401 | |
| 402 | unlock_driver(rdev); |
| 403 | |
| 404 | if (ret != 0) { |
| 405 | ERROR("%s: could not set flag %d ret=%d\n", |
| 406 | rdev->desc->node_name, flag, ret); |
| 407 | return ret; |
| 408 | } |
| 409 | |
| 410 | rdev->flags |= flag; |
| 411 | |
| 412 | return 0; |
| 413 | } |
| 414 | |
| 415 | /* |
| 416 | * Parse the device-tree for a regulator |
| 417 | * |
| 418 | * Read min/max voltage from dt and check its validity |
| 419 | * Read the properties, and call the driver to set flags |
| 420 | * Read power supply phandle |
| 421 | * Read and store low power mode states |
| 422 | * |
| 423 | * @rdev - pointer to rdev struct |
| 424 | * @node - device-tree node offset of the regulator |
| 425 | * Return 0 if disabled, 1 if enabled, <0 else. |
| 426 | */ |
| 427 | static int parse_dt(struct rdev *rdev, int node) |
| 428 | { |
| 429 | void *fdt; |
| 430 | const fdt32_t *cuint; |
| 431 | const uint16_t *levels; |
| 432 | size_t size; |
| 433 | int ret; |
| 434 | |
| 435 | VERBOSE("%s: parse dt\n", rdev->desc->node_name); |
| 436 | |
| 437 | if (fdt_get_address(&fdt) == 0) { |
| 438 | return -ENOENT; |
| 439 | } |
| 440 | |
| 441 | rdev->phandle = fdt_get_phandle(fdt, node); |
| 442 | |
| 443 | cuint = fdt_getprop(fdt, node, "regulator-min-microvolt", NULL); |
| 444 | if (cuint != NULL) { |
| 445 | uint16_t min_mv; |
| 446 | |
| 447 | min_mv = (uint16_t)(fdt32_to_cpu(*cuint) / 1000U); |
| 448 | VERBOSE("%s: min_mv=%d\n", rdev->desc->node_name, (int)min_mv); |
| 449 | if (min_mv <= rdev->max_mv) { |
| 450 | rdev->min_mv = min_mv; |
| 451 | } else { |
| 452 | ERROR("%s: min_mv=%d is too high\n", |
| 453 | rdev->desc->node_name, (int)min_mv); |
| 454 | return -EINVAL; |
| 455 | } |
| 456 | } |
| 457 | |
| 458 | cuint = fdt_getprop(fdt, node, "regulator-max-microvolt", NULL); |
| 459 | if (cuint != NULL) { |
| 460 | uint16_t max_mv; |
| 461 | |
| 462 | max_mv = (uint16_t)(fdt32_to_cpu(*cuint) / 1000U); |
| 463 | VERBOSE("%s: max_mv=%d\n", rdev->desc->node_name, (int)max_mv); |
| 464 | if (max_mv >= rdev->min_mv) { |
| 465 | rdev->max_mv = max_mv; |
| 466 | } else { |
| 467 | ERROR("%s: max_mv=%d is too low\n", |
| 468 | rdev->desc->node_name, (int)max_mv); |
| 469 | return -EINVAL; |
| 470 | } |
| 471 | } |
| 472 | |
| 473 | /* validate that min and max values can be used */ |
| 474 | ret = regulator_list_voltages(rdev, &levels, &size); |
| 475 | if ((ret != 0) && (ret != -ENODEV)) { |
| 476 | return ret; |
| 477 | } |
| 478 | |
| 479 | return 0; |
| 480 | } |
| 481 | |
| 482 | /* |
| 483 | * Register a regulator driver in regulator framework. |
| 484 | * Initialize voltage range from driver description |
| 485 | * |
| 486 | * @desc - pointer to the regulator description |
| 487 | * @node - device-tree node offset of the regulator |
| 488 | * Return 0 if succeed, non 0 else. |
| 489 | */ |
| 490 | int regulator_register(const struct regul_description *desc, int node) |
| 491 | { |
| 492 | struct rdev *rdev; |
| 493 | |
| 494 | assert(desc != NULL); |
| 495 | |
| 496 | VERBOSE("register %s\n", desc->node_name); |
| 497 | |
| 498 | for_each_rdev(rdev) { |
| 499 | if (rdev->desc == NULL) { |
| 500 | break; |
| 501 | } |
| 502 | } |
| 503 | |
| 504 | if (rdev == rdev_array + PLAT_NB_RDEVS) { |
| 505 | WARN("Not enough place for regulators, PLAT_NB_RDEVS should be increased.\n"); |
| 506 | return -ENOMEM; |
| 507 | } |
| 508 | |
| 509 | rdev->desc = desc; |
| 510 | rdev->enable_ramp_delay = rdev->desc->enable_ramp_delay; |
| 511 | |
| 512 | if (rdev->desc->ops->list_voltages != NULL) { |
| 513 | int ret; |
| 514 | const uint16_t *levels; |
| 515 | size_t count; |
| 516 | |
| 517 | lock_driver(rdev); |
| 518 | |
| 519 | ret = rdev->desc->ops->list_voltages(rdev->desc, &levels, &count); |
| 520 | |
| 521 | unlock_driver(rdev); |
| 522 | |
| 523 | if (ret < 0) { |
| 524 | ERROR("regul %s set state failed: err:%d\n", |
| 525 | rdev->desc->node_name, ret); |
| 526 | return ret; |
| 527 | } |
| 528 | |
| 529 | rdev->min_mv = levels[0]; |
| 530 | rdev->max_mv = levels[count - 1U]; |
| 531 | } else { |
| 532 | rdev->max_mv = UINT16_MAX; |
| 533 | } |
| 534 | |
| 535 | return parse_dt(rdev, node); |
| 536 | } |