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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 | /* * Rockchip IO Voltage Domain driver * * Copyright 2014 MundoReader S.L. * Copyright 2014 Google, Inc. * * This software is licensed under the terms of the GNU General Public * License version 2, as published by the Free Software Foundation, and * may be copied, distributed, and modified under those terms. * * This program is distributed in the hope that 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/kernel.h> #include <linux/module.h> #include <linux/err.h> #include <linux/mfd/syscon.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/regmap.h> #include <linux/regulator/consumer.h> #define MAX_SUPPLIES 16 /* * The max voltage for 1.8V and 3.3V come from the Rockchip datasheet under * "Recommended Operating Conditions" for "Digital GPIO". When the typical * is 3.3V the max is 3.6V. When the typical is 1.8V the max is 1.98V. * * They are used like this: * - If the voltage on a rail is above the "1.8" voltage (1.98V) we'll tell the * SoC we're at 3.3. * - If the voltage on a rail is above the "3.3" voltage (3.6V) we'll consider * that to be an error. */ #define MAX_VOLTAGE_1_8 1980000 #define MAX_VOLTAGE_3_3 3600000 #define PX30_IO_VSEL 0x180 #define PX30_IO_VSEL_VCCIO6_SRC BIT(0) #define PX30_IO_VSEL_VCCIO6_SUPPLY_NUM 1 #define RK3288_SOC_CON2 0x24c #define RK3288_SOC_CON2_FLASH0 BIT(7) #define RK3288_SOC_FLASH_SUPPLY_NUM 2 #define RK3328_SOC_CON4 0x410 #define RK3328_SOC_CON4_VCCIO2 BIT(7) #define RK3328_SOC_VCCIO2_SUPPLY_NUM 1 #define RK3368_SOC_CON15 0x43c #define RK3368_SOC_CON15_FLASH0 BIT(14) #define RK3368_SOC_FLASH_SUPPLY_NUM 2 #define RK3399_PMUGRF_CON0 0x180 #define RK3399_PMUGRF_CON0_VSEL BIT(8) #define RK3399_PMUGRF_VSEL_SUPPLY_NUM 9 struct rockchip_iodomain; /** * @supplies: voltage settings matching the register bits. */ struct rockchip_iodomain_soc_data { int grf_offset; const char *supply_names[MAX_SUPPLIES]; void (*init)(struct rockchip_iodomain *iod); }; struct rockchip_iodomain_supply { struct rockchip_iodomain *iod; struct regulator *reg; struct notifier_block nb; int idx; }; struct rockchip_iodomain { struct device *dev; struct regmap *grf; const struct rockchip_iodomain_soc_data *soc_data; struct rockchip_iodomain_supply supplies[MAX_SUPPLIES]; }; static int rockchip_iodomain_write(struct rockchip_iodomain_supply *supply, int uV) { struct rockchip_iodomain *iod = supply->iod; u32 val; int ret; /* set value bit */ val = (uV > MAX_VOLTAGE_1_8) ? 0 : 1; val <<= supply->idx; /* apply hiword-mask */ val |= (BIT(supply->idx) << 16); ret = regmap_write(iod->grf, iod->soc_data->grf_offset, val); if (ret) dev_err(iod->dev, "Couldn't write to GRF\n"); return ret; } static int rockchip_iodomain_notify(struct notifier_block *nb, unsigned long event, void *data) { struct rockchip_iodomain_supply *supply = container_of(nb, struct rockchip_iodomain_supply, nb); int uV; int ret; /* * According to Rockchip it's important to keep the SoC IO domain * higher than (or equal to) the external voltage. That means we need * to change it before external voltage changes happen in the case * of an increase. * * Note that in the "pre" change we pick the max possible voltage that * the regulator might end up at (the client requests a range and we * don't know for certain the exact voltage). Right now we rely on the * slop in MAX_VOLTAGE_1_8 and MAX_VOLTAGE_3_3 to save us if clients * request something like a max of 3.6V when they really want 3.3V. * We could attempt to come up with better rules if this fails. */ if (event & REGULATOR_EVENT_PRE_VOLTAGE_CHANGE) { struct pre_voltage_change_data *pvc_data = data; uV = max_t(unsigned long, pvc_data->old_uV, pvc_data->max_uV); } else if (event & (REGULATOR_EVENT_VOLTAGE_CHANGE | REGULATOR_EVENT_ABORT_VOLTAGE_CHANGE)) { uV = (unsigned long)data; } else { return NOTIFY_OK; } dev_dbg(supply->iod->dev, "Setting to %d\n", uV); if (uV > MAX_VOLTAGE_3_3) { dev_err(supply->iod->dev, "Voltage too high: %d\n", uV); if (event == REGULATOR_EVENT_PRE_VOLTAGE_CHANGE) return NOTIFY_BAD; } ret = rockchip_iodomain_write(supply, uV); if (ret && event == REGULATOR_EVENT_PRE_VOLTAGE_CHANGE) return NOTIFY_BAD; dev_dbg(supply->iod->dev, "Setting to %d done\n", uV); return NOTIFY_OK; } static void px30_iodomain_init(struct rockchip_iodomain *iod) { int ret; u32 val; /* if no VCCIO0 supply we should leave things alone */ if (!iod->supplies[PX30_IO_VSEL_VCCIO6_SUPPLY_NUM].reg) return; /* * set vccio0 iodomain to also use this framework * instead of a special gpio. */ val = PX30_IO_VSEL_VCCIO6_SRC | (PX30_IO_VSEL_VCCIO6_SRC << 16); ret = regmap_write(iod->grf, PX30_IO_VSEL, val); if (ret < 0) dev_warn(iod->dev, "couldn't update vccio0 ctrl\n"); } static void rk3288_iodomain_init(struct rockchip_iodomain *iod) { int ret; u32 val; /* if no flash supply we should leave things alone */ if (!iod->supplies[RK3288_SOC_FLASH_SUPPLY_NUM].reg) return; /* * set flash0 iodomain to also use this framework * instead of a special gpio. */ val = RK3288_SOC_CON2_FLASH0 | (RK3288_SOC_CON2_FLASH0 << 16); ret = regmap_write(iod->grf, RK3288_SOC_CON2, val); if (ret < 0) dev_warn(iod->dev, "couldn't update flash0 ctrl\n"); } static void rk3328_iodomain_init(struct rockchip_iodomain *iod) { int ret; u32 val; /* if no vccio2 supply we should leave things alone */ if (!iod->supplies[RK3328_SOC_VCCIO2_SUPPLY_NUM].reg) return; /* * set vccio2 iodomain to also use this framework * instead of a special gpio. */ val = RK3328_SOC_CON4_VCCIO2 | (RK3328_SOC_CON4_VCCIO2 << 16); ret = regmap_write(iod->grf, RK3328_SOC_CON4, val); if (ret < 0) dev_warn(iod->dev, "couldn't update vccio2 vsel ctrl\n"); } static void rk3368_iodomain_init(struct rockchip_iodomain *iod) { int ret; u32 val; /* if no flash supply we should leave things alone */ if (!iod->supplies[RK3368_SOC_FLASH_SUPPLY_NUM].reg) return; /* * set flash0 iodomain to also use this framework * instead of a special gpio. */ val = RK3368_SOC_CON15_FLASH0 | (RK3368_SOC_CON15_FLASH0 << 16); ret = regmap_write(iod->grf, RK3368_SOC_CON15, val); if (ret < 0) dev_warn(iod->dev, "couldn't update flash0 ctrl\n"); } static void rk3399_pmu_iodomain_init(struct rockchip_iodomain *iod) { int ret; u32 val; /* if no pmu io supply we should leave things alone */ if (!iod->supplies[RK3399_PMUGRF_VSEL_SUPPLY_NUM].reg) return; /* * set pmu io iodomain to also use this framework * instead of a special gpio. */ val = RK3399_PMUGRF_CON0_VSEL | (RK3399_PMUGRF_CON0_VSEL << 16); ret = regmap_write(iod->grf, RK3399_PMUGRF_CON0, val); if (ret < 0) dev_warn(iod->dev, "couldn't update pmu io iodomain ctrl\n"); } static const struct rockchip_iodomain_soc_data soc_data_px30 = { .grf_offset = 0x180, .supply_names = { NULL, "vccio6", "vccio1", "vccio2", "vccio3", "vccio4", "vccio5", "vccio-oscgpi", }, .init = px30_iodomain_init, }; static const struct rockchip_iodomain_soc_data soc_data_px30_pmu = { .grf_offset = 0x100, .supply_names = { NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "pmuio1", "pmuio2", }, }; /* * On the rk3188 the io-domains are handled by a shared register with the * lower 8 bits being still being continuing drive-strength settings. */ static const struct rockchip_iodomain_soc_data soc_data_rk3188 = { .grf_offset = 0x104, .supply_names = { NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "ap0", "ap1", "cif", "flash", "vccio0", "vccio1", "lcdc0", "lcdc1", }, }; static const struct rockchip_iodomain_soc_data soc_data_rk3228 = { .grf_offset = 0x418, .supply_names = { "vccio1", "vccio2", "vccio3", "vccio4", }, }; static const struct rockchip_iodomain_soc_data soc_data_rk3288 = { .grf_offset = 0x380, .supply_names = { "lcdc", /* LCDC_VDD */ "dvp", /* DVPIO_VDD */ "flash0", /* FLASH0_VDD (emmc) */ "flash1", /* FLASH1_VDD (sdio1) */ "wifi", /* APIO3_VDD (sdio0) */ "bb", /* APIO5_VDD */ "audio", /* APIO4_VDD */ "sdcard", /* SDMMC0_VDD (sdmmc) */ "gpio30", /* APIO1_VDD */ "gpio1830", /* APIO2_VDD */ }, .init = rk3288_iodomain_init, }; static const struct rockchip_iodomain_soc_data soc_data_rk3328 = { .grf_offset = 0x410, .supply_names = { "vccio1", "vccio2", "vccio3", "vccio4", "vccio5", "vccio6", "pmuio", }, .init = rk3328_iodomain_init, }; static const struct rockchip_iodomain_soc_data soc_data_rk3368 = { .grf_offset = 0x900, .supply_names = { NULL, /* reserved */ "dvp", /* DVPIO_VDD */ "flash0", /* FLASH0_VDD (emmc) */ "wifi", /* APIO2_VDD (sdio0) */ NULL, "audio", /* APIO3_VDD */ "sdcard", /* SDMMC0_VDD (sdmmc) */ "gpio30", /* APIO1_VDD */ "gpio1830", /* APIO4_VDD (gpujtag) */ }, .init = rk3368_iodomain_init, }; static const struct rockchip_iodomain_soc_data soc_data_rk3368_pmu = { .grf_offset = 0x100, .supply_names = { NULL, NULL, NULL, NULL, "pmu", /*PMU IO domain*/ "vop", /*LCDC IO domain*/ }, }; static const struct rockchip_iodomain_soc_data soc_data_rk3399 = { .grf_offset = 0xe640, .supply_names = { "bt656", /* APIO2_VDD */ "audio", /* APIO5_VDD */ "sdmmc", /* SDMMC0_VDD */ "gpio1830", /* APIO4_VDD */ }, }; static const struct rockchip_iodomain_soc_data soc_data_rk3399_pmu = { .grf_offset = 0x180, .supply_names = { NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "pmu1830", /* PMUIO2_VDD */ }, .init = rk3399_pmu_iodomain_init, }; static const struct rockchip_iodomain_soc_data soc_data_rv1108 = { .grf_offset = 0x404, .supply_names = { NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, "vccio1", "vccio2", "vccio3", "vccio5", "vccio6", }, }; static const struct rockchip_iodomain_soc_data soc_data_rv1108_pmu = { .grf_offset = 0x104, .supply_names = { "pmu", }, }; static const struct of_device_id rockchip_iodomain_match[] = { { .compatible = "rockchip,px30-io-voltage-domain", .data = (void *)&soc_data_px30 }, { .compatible = "rockchip,px30-pmu-io-voltage-domain", .data = (void *)&soc_data_px30_pmu }, { .compatible = "rockchip,rk3188-io-voltage-domain", .data = &soc_data_rk3188 }, { .compatible = "rockchip,rk3228-io-voltage-domain", .data = &soc_data_rk3228 }, { .compatible = "rockchip,rk3288-io-voltage-domain", .data = &soc_data_rk3288 }, { .compatible = "rockchip,rk3328-io-voltage-domain", .data = &soc_data_rk3328 }, { .compatible = "rockchip,rk3368-io-voltage-domain", .data = &soc_data_rk3368 }, { .compatible = "rockchip,rk3368-pmu-io-voltage-domain", .data = &soc_data_rk3368_pmu }, { .compatible = "rockchip,rk3399-io-voltage-domain", .data = &soc_data_rk3399 }, { .compatible = "rockchip,rk3399-pmu-io-voltage-domain", .data = &soc_data_rk3399_pmu }, { .compatible = "rockchip,rv1108-io-voltage-domain", .data = &soc_data_rv1108 }, { .compatible = "rockchip,rv1108-pmu-io-voltage-domain", .data = &soc_data_rv1108_pmu }, { /* sentinel */ }, }; MODULE_DEVICE_TABLE(of, rockchip_iodomain_match); static int rockchip_iodomain_probe(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; const struct of_device_id *match; struct rockchip_iodomain *iod; struct device *parent; int i, ret = 0; if (!np) return -ENODEV; iod = devm_kzalloc(&pdev->dev, sizeof(*iod), GFP_KERNEL); if (!iod) return -ENOMEM; iod->dev = &pdev->dev; platform_set_drvdata(pdev, iod); match = of_match_node(rockchip_iodomain_match, np); iod->soc_data = match->data; parent = pdev->dev.parent; if (parent && parent->of_node) { iod->grf = syscon_node_to_regmap(parent->of_node); } else { dev_dbg(&pdev->dev, "falling back to old binding\n"); iod->grf = syscon_regmap_lookup_by_phandle(np, "rockchip,grf"); } if (IS_ERR(iod->grf)) { dev_err(&pdev->dev, "couldn't find grf regmap\n"); return PTR_ERR(iod->grf); } for (i = 0; i < MAX_SUPPLIES; i++) { const char *supply_name = iod->soc_data->supply_names[i]; struct rockchip_iodomain_supply *supply = &iod->supplies[i]; struct regulator *reg; int uV; if (!supply_name) continue; reg = devm_regulator_get_optional(iod->dev, supply_name); if (IS_ERR(reg)) { ret = PTR_ERR(reg); /* If a supply wasn't specified, that's OK */ if (ret == -ENODEV) continue; else if (ret != -EPROBE_DEFER) dev_err(iod->dev, "couldn't get regulator %s\n", supply_name); goto unreg_notify; } /* set initial correct value */ uV = regulator_get_voltage(reg); /* must be a regulator we can get the voltage of */ if (uV < 0) { dev_err(iod->dev, "Can't determine voltage: %s\n", supply_name); goto unreg_notify; } if (uV > MAX_VOLTAGE_3_3) { dev_crit(iod->dev, "%d uV is too high. May damage SoC!\n", uV); ret = -EINVAL; goto unreg_notify; } /* setup our supply */ supply->idx = i; supply->iod = iod; supply->reg = reg; supply->nb.notifier_call = rockchip_iodomain_notify; ret = rockchip_iodomain_write(supply, uV); if (ret) { supply->reg = NULL; goto unreg_notify; } /* register regulator notifier */ ret = regulator_register_notifier(reg, &supply->nb); if (ret) { dev_err(&pdev->dev, "regulator notifier request failed\n"); supply->reg = NULL; goto unreg_notify; } } if (iod->soc_data->init) iod->soc_data->init(iod); return 0; unreg_notify: for (i = MAX_SUPPLIES - 1; i >= 0; i--) { struct rockchip_iodomain_supply *io_supply = &iod->supplies[i]; if (io_supply->reg) regulator_unregister_notifier(io_supply->reg, &io_supply->nb); } return ret; } static int rockchip_iodomain_remove(struct platform_device *pdev) { struct rockchip_iodomain *iod = platform_get_drvdata(pdev); int i; for (i = MAX_SUPPLIES - 1; i >= 0; i--) { struct rockchip_iodomain_supply *io_supply = &iod->supplies[i]; if (io_supply->reg) regulator_unregister_notifier(io_supply->reg, &io_supply->nb); } return 0; } static struct platform_driver rockchip_iodomain_driver = { .probe = rockchip_iodomain_probe, .remove = rockchip_iodomain_remove, .driver = { .name = "rockchip-iodomain", .of_match_table = rockchip_iodomain_match, }, }; module_platform_driver(rockchip_iodomain_driver); MODULE_DESCRIPTION("Rockchip IO-domain driver"); MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>"); MODULE_AUTHOR("Doug Anderson <dianders@chromium.org>"); MODULE_LICENSE("GPL v2"); |