drivers/regulator/qcom_rpm-regulator.c

   1 /*
   2  * Copyright (c) 2014, Sony Mobile Communications AB.
   3  * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 and
   7  * only version 2 as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/of.h>
  18 #include <linux/of_device.h>
  19 #include <linux/regulator/driver.h>
  20 #include <linux/regulator/machine.h>
  21 #include <linux/regulator/of_regulator.h>
  22 #include <linux/mfd/qcom_rpm.h>
  23
  24 #include <dt-bindings/mfd/qcom-rpm.h>
  25
  26 #define MAX_REQUEST_LEN 2
  27
  28 struct request_member {
  29         int             word;
  30         unsigned int    mask;
  31         int             shift;
  32 };
  33
  34 struct rpm_reg_parts {
  35         struct request_member mV;               /* used if voltage is in mV */
  36         struct request_member uV;               /* used if voltage is in uV */
  37         struct request_member ip;               /* peak current in mA */
  38         struct request_member pd;               /* pull down enable */
  39         struct request_member ia;               /* average current in mA */
  40         struct request_member fm;               /* force mode */
  41         struct request_member pm;               /* power mode */
  42         struct request_member pc;               /* pin control */
  43         struct request_member pf;               /* pin function */
  44         struct request_member enable_state;     /* NCP and switch */
  45         struct request_member comp_mode;        /* NCP */
  46         struct request_member freq;             /* frequency: NCP and SMPS */
  47         struct request_member freq_clk_src;     /* clock source: SMPS */
  48         struct request_member hpm;              /* switch: control OCP and SS */
  49         int request_len;
  50 };
  51
  52 #define FORCE_MODE_IS_2_BITS(reg) \
  53         (((reg)->parts->fm.mask >> (reg)->parts->fm.shift) == 3)
  54
  55 struct qcom_rpm_reg {
  56         struct qcom_rpm *rpm;
  57
  58         struct mutex lock;
  59         struct device *dev;
  60         struct regulator_desc desc;
  61         const struct rpm_reg_parts *parts;
  62
  63         int resource;
  64         u32 val[MAX_REQUEST_LEN];
  65
  66         int uV;
  67         int is_enabled;
  68
  69         bool supports_force_mode_auto;
  70         bool supports_force_mode_bypass;
  71 };
  72
  73 static const struct rpm_reg_parts rpm8660_ldo_parts = {
  74         .request_len    = 2,
  75         .mV             = { 0, 0x00000FFF,  0 },
  76         .ip             = { 0, 0x00FFF000, 12 },
  77         .fm             = { 0, 0x03000000, 24 },
  78         .pc             = { 0, 0x3C000000, 26 },
  79         .pf             = { 0, 0xC0000000, 30 },
  80         .pd             = { 1, 0x00000001,  0 },
  81         .ia             = { 1, 0x00001FFE,  1 },
  82 };
  83
  84 static const struct rpm_reg_parts rpm8660_smps_parts = {
  85         .request_len    = 2,
  86         .mV             = { 0, 0x00000FFF,  0 },
  87         .ip             = { 0, 0x00FFF000, 12 },
  88         .fm             = { 0, 0x03000000, 24 },
  89         .pc             = { 0, 0x3C000000, 26 },
  90         .pf             = { 0, 0xC0000000, 30 },
  91         .pd             = { 1, 0x00000001,  0 },
  92         .ia             = { 1, 0x00001FFE,  1 },
  93         .freq           = { 1, 0x001FE000, 13 },
  94         .freq_clk_src   = { 1, 0x00600000, 21 },
  95 };
  96
  97 static const struct rpm_reg_parts rpm8660_switch_parts = {
  98         .request_len    = 1,
  99         .enable_state   = { 0, 0x00000001,  0 },
 100         .pd             = { 0, 0x00000002,  1 },
 101         .pc             = { 0, 0x0000003C,  2 },
 102         .pf             = { 0, 0x000000C0,  6 },
 103         .hpm            = { 0, 0x00000300,  8 },
 104 };
 105
 106 static const struct rpm_reg_parts rpm8660_ncp_parts = {
 107         .request_len    = 1,
 108         .mV             = { 0, 0x00000FFF,  0 },
 109         .enable_state   = { 0, 0x00001000, 12 },
 110         .comp_mode      = { 0, 0x00002000, 13 },
 111         .freq           = { 0, 0x003FC000, 14 },
 112 };
 113
 114 static const struct rpm_reg_parts rpm8960_ldo_parts = {
 115         .request_len    = 2,
 116         .uV             = { 0, 0x007FFFFF,  0 },
 117         .pd             = { 0, 0x00800000, 23 },
 118         .pc             = { 0, 0x0F000000, 24 },
 119         .pf             = { 0, 0xF0000000, 28 },
 120         .ip             = { 1, 0x000003FF,  0 },
 121         .ia             = { 1, 0x000FFC00, 10 },
 122         .fm             = { 1, 0x00700000, 20 },
 123 };
 124
 125 static const struct rpm_reg_parts rpm8960_smps_parts = {
 126         .request_len    = 2,
 127         .uV             = { 0, 0x007FFFFF,  0 },
 128         .pd             = { 0, 0x00800000, 23 },
 129         .pc             = { 0, 0x0F000000, 24 },
 130         .pf             = { 0, 0xF0000000, 28 },
 131         .ip             = { 1, 0x000003FF,  0 },
 132         .ia             = { 1, 0x000FFC00, 10 },
 133         .fm             = { 1, 0x00700000, 20 },
 134         .pm             = { 1, 0x00800000, 23 },
 135         .freq           = { 1, 0x1F000000, 24 },
 136         .freq_clk_src   = { 1, 0x60000000, 29 },
 137 };
 138
 139 static const struct rpm_reg_parts rpm8960_switch_parts = {
 140         .request_len    = 1,
 141         .enable_state   = { 0, 0x00000001,  0 },
 142         .pd             = { 0, 0x00000002,  1 },
 143         .pc             = { 0, 0x0000003C,  2 },
 144         .pf             = { 0, 0x000003C0,  6 },
 145         .hpm            = { 0, 0x00000C00, 10 },
 146 };
 147
 148 static const struct rpm_reg_parts rpm8960_ncp_parts = {
 149         .request_len    = 1,
 150         .uV             = { 0, 0x007FFFFF,  0 },
 151         .enable_state   = { 0, 0x00800000, 23 },
 152         .comp_mode      = { 0, 0x01000000, 24 },
 153         .freq           = { 0, 0x3E000000, 25 },
 154 };
 155
 156 /*
 157  * Physically available PMIC regulator voltage ranges
 158  */
 159 static const struct regulator_linear_range pldo_ranges[] = {
 160         REGULATOR_LINEAR_RANGE( 750000,   0,  59, 12500),
 161         REGULATOR_LINEAR_RANGE(1500000,  60, 123, 25000),
 162         REGULATOR_LINEAR_RANGE(3100000, 124, 160, 50000),
 163 };
 164
 165 static const struct regulator_linear_range nldo_ranges[] = {
 166         REGULATOR_LINEAR_RANGE( 750000,   0,  63, 12500),
 167 };
 168
 169 static const struct regulator_linear_range nldo1200_ranges[] = {
 170         REGULATOR_LINEAR_RANGE( 375000,   0,  59,  6250),
 171         REGULATOR_LINEAR_RANGE( 750000,  60, 123, 12500),
 172 };
 173
 174 static const struct regulator_linear_range smps_ranges[] = {
 175         REGULATOR_LINEAR_RANGE( 375000,   0,  29, 12500),
 176         REGULATOR_LINEAR_RANGE( 750000,  30,  89, 12500),
 177         REGULATOR_LINEAR_RANGE(1500000,  90, 153, 25000),
 178 };
 179
 180 static const struct regulator_linear_range ftsmps_ranges[] = {
 181         REGULATOR_LINEAR_RANGE( 350000,   0,   6, 50000),
 182         REGULATOR_LINEAR_RANGE( 700000,   7,  63, 12500),
 183         REGULATOR_LINEAR_RANGE(1500000,  64, 100, 50000),
 184 };
 185
 186 static const struct regulator_linear_range smb208_ranges[] = {
 187         REGULATOR_LINEAR_RANGE( 375000,   0,  29, 12500),
 188         REGULATOR_LINEAR_RANGE( 750000,  30,  89, 12500),
 189         REGULATOR_LINEAR_RANGE(1500000,  90, 153, 25000),
 190         REGULATOR_LINEAR_RANGE(3100000, 154, 234, 25000),
 191 };
 192
 193 static const struct regulator_linear_range ncp_ranges[] = {
 194         REGULATOR_LINEAR_RANGE(1500000,   0,  31, 50000),
 195 };
 196
 197 static int rpm_reg_write(struct qcom_rpm_reg *vreg,
 198                          const struct request_member *req,
 199                          const int value)
 200 {
 201         if (WARN_ON((value << req->shift) & ~req->mask))
 202                 return -EINVAL;
 203
 204         vreg->val[req->word] &= ~req->mask;
 205         vreg->val[req->word] |= value << req->shift;
 206
 207         return qcom_rpm_write(vreg->rpm,
 208                               vreg->resource,
 209                               vreg->val,
 210                               vreg->parts->request_len);
 211 }
 212
 213 static int rpm_reg_set_mV_sel(struct regulator_dev *rdev,
 214                               unsigned selector)
 215 {
 216         struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
 217         const struct rpm_reg_parts *parts = vreg->parts;
 218         const struct request_member *req = &parts->mV;
 219         int ret = 0;
 220         int uV;
 221
 222         if (req->mask == 0)
 223                 return -EINVAL;
 224
 225         uV = regulator_list_voltage_linear_range(rdev, selector);
 226         if (uV < 0)
 227                 return uV;
 228
 229         mutex_lock(&vreg->lock);
 230         vreg->uV = uV;
 231         if (vreg->is_enabled)
 232                 ret = rpm_reg_write(vreg, req, vreg->uV / 1000);
 233         mutex_unlock(&vreg->lock);
 234
 235         return ret;
 236 }
 237
 238 static int rpm_reg_set_uV_sel(struct regulator_dev *rdev,
 239                               unsigned selector)
 240 {
 241         struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
 242         const struct rpm_reg_parts *parts = vreg->parts;
 243         const struct request_member *req = &parts->uV;
 244         int ret = 0;
 245         int uV;
 246
 247         if (req->mask == 0)
 248                 return -EINVAL;
 249
 250         uV = regulator_list_voltage_linear_range(rdev, selector);
 251         if (uV < 0)
 252                 return uV;
 253
 254         mutex_lock(&vreg->lock);
 255         vreg->uV = uV;
 256         if (vreg->is_enabled)
 257                 ret = rpm_reg_write(vreg, req, vreg->uV);
 258         mutex_unlock(&vreg->lock);
 259
 260         return ret;
 261 }
 262
 263 static int rpm_reg_get_voltage(struct regulator_dev *rdev)
 264 {
 265         struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
 266
 267         return vreg->uV;
 268 }
 269
 270 static int rpm_reg_mV_enable(struct regulator_dev *rdev)
 271 {
 272         struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
 273         const struct rpm_reg_parts *parts = vreg->parts;
 274         const struct request_member *req = &parts->mV;
 275         int ret;
 276
 277         if (req->mask == 0)
 278                 return -EINVAL;
 279
 280         mutex_lock(&vreg->lock);
 281         ret = rpm_reg_write(vreg, req, vreg->uV / 1000);
 282         if (!ret)
 283                 vreg->is_enabled = 1;
 284         mutex_unlock(&vreg->lock);
 285
 286         return ret;
 287 }
 288
 289 static int rpm_reg_uV_enable(struct regulator_dev *rdev)
 290 {
 291         struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
 292         const struct rpm_reg_parts *parts = vreg->parts;
 293         const struct request_member *req = &parts->uV;
 294         int ret;
 295
 296         if (req->mask == 0)
 297                 return -EINVAL;
 298
 299         mutex_lock(&vreg->lock);
 300         ret = rpm_reg_write(vreg, req, vreg->uV);
 301         if (!ret)
 302                 vreg->is_enabled = 1;
 303         mutex_unlock(&vreg->lock);
 304
 305         return ret;
 306 }
 307
 308 static int rpm_reg_switch_enable(struct regulator_dev *rdev)
 309 {
 310         struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
 311         const struct rpm_reg_parts *parts = vreg->parts;
 312         const struct request_member *req = &parts->enable_state;
 313         int ret;
 314
 315         if (req->mask == 0)
 316                 return -EINVAL;
 317
 318         mutex_lock(&vreg->lock);
 319         ret = rpm_reg_write(vreg, req, 1);
 320         if (!ret)
 321                 vreg->is_enabled = 1;
 322         mutex_unlock(&vreg->lock);
 323
 324         return ret;
 325 }
 326
 327 static int rpm_reg_mV_disable(struct regulator_dev *rdev)
 328 {
 329         struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
 330         const struct rpm_reg_parts *parts = vreg->parts;
 331         const struct request_member *req = &parts->mV;
 332         int ret;
 333
 334         if (req->mask == 0)
 335                 return -EINVAL;
 336
 337         mutex_lock(&vreg->lock);
 338         ret = rpm_reg_write(vreg, req, 0);
 339         if (!ret)
 340                 vreg->is_enabled = 0;
 341         mutex_unlock(&vreg->lock);
 342
 343         return ret;
 344 }
 345
 346 static int rpm_reg_uV_disable(struct regulator_dev *rdev)
 347 {
 348         struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
 349         const struct rpm_reg_parts *parts = vreg->parts;
 350         const struct request_member *req = &parts->uV;
 351         int ret;
 352
 353         if (req->mask == 0)
 354                 return -EINVAL;
 355
 356         mutex_lock(&vreg->lock);
 357         ret = rpm_reg_write(vreg, req, 0);
 358         if (!ret)
 359                 vreg->is_enabled = 0;
 360         mutex_unlock(&vreg->lock);
 361
 362         return ret;
 363 }
 364
 365 static int rpm_reg_switch_disable(struct regulator_dev *rdev)
 366 {
 367         struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
 368         const struct rpm_reg_parts *parts = vreg->parts;
 369         const struct request_member *req = &parts->enable_state;
 370         int ret;
 371
 372         if (req->mask == 0)
 373                 return -EINVAL;
 374
 375         mutex_lock(&vreg->lock);
 376         ret = rpm_reg_write(vreg, req, 0);
 377         if (!ret)
 378                 vreg->is_enabled = 0;
 379         mutex_unlock(&vreg->lock);
 380
 381         return ret;
 382 }
 383
 384 static int rpm_reg_is_enabled(struct regulator_dev *rdev)
 385 {
 386         struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
 387
 388         return vreg->is_enabled;
 389 }
 390
 391 static struct regulator_ops uV_ops = {
 392         .list_voltage = regulator_list_voltage_linear_range,
 393
 394         .set_voltage_sel = rpm_reg_set_uV_sel,
 395         .get_voltage = rpm_reg_get_voltage,
 396
 397         .enable = rpm_reg_uV_enable,
 398         .disable = rpm_reg_uV_disable,
 399         .is_enabled = rpm_reg_is_enabled,
 400 };
 401
 402 static struct regulator_ops mV_ops = {
 403         .list_voltage = regulator_list_voltage_linear_range,
 404
 405         .set_voltage_sel = rpm_reg_set_mV_sel,
 406         .get_voltage = rpm_reg_get_voltage,
 407
 408         .enable = rpm_reg_mV_enable,
 409         .disable = rpm_reg_mV_disable,
 410         .is_enabled = rpm_reg_is_enabled,
 411 };
 412
 413 static struct regulator_ops switch_ops = {
 414         .enable = rpm_reg_switch_enable,
 415         .disable = rpm_reg_switch_disable,
 416         .is_enabled = rpm_reg_is_enabled,
 417 };
 418
 419 /*
 420  * PM8058 regulators
 421  */
 422 static const struct qcom_rpm_reg pm8058_pldo = {
 423         .desc.linear_ranges = pldo_ranges,
 424         .desc.n_linear_ranges = ARRAY_SIZE(pldo_ranges),
 425         .desc.n_voltages = 161,
 426         .desc.ops = &mV_ops,
 427         .parts = &rpm8660_ldo_parts,
 428         .supports_force_mode_auto = false,
 429         .supports_force_mode_bypass = false,
 430 };
 431
 432 static const struct qcom_rpm_reg pm8058_nldo = {
 433         .desc.linear_ranges = nldo_ranges,
 434         .desc.n_linear_ranges = ARRAY_SIZE(nldo_ranges),
 435         .desc.n_voltages = 64,
 436         .desc.ops = &mV_ops,
 437         .parts = &rpm8660_ldo_parts,
 438         .supports_force_mode_auto = false,
 439         .supports_force_mode_bypass = false,
 440 };
 441
 442 static const struct qcom_rpm_reg pm8058_smps = {
 443         .desc.linear_ranges = smps_ranges,
 444         .desc.n_linear_ranges = ARRAY_SIZE(smps_ranges),
 445         .desc.n_voltages = 154,
 446         .desc.ops = &mV_ops,
 447         .parts = &rpm8660_smps_parts,
 448         .supports_force_mode_auto = false,
 449         .supports_force_mode_bypass = false,
 450 };
 451
 452 static const struct qcom_rpm_reg pm8058_ncp = {
 453         .desc.linear_ranges = ncp_ranges,
 454         .desc.n_linear_ranges = ARRAY_SIZE(ncp_ranges),
 455         .desc.n_voltages = 32,
 456         .desc.ops = &mV_ops,
 457         .parts = &rpm8660_ncp_parts,
 458 };
 459
 460 static const struct qcom_rpm_reg pm8058_switch = {
 461         .desc.ops = &switch_ops,
 462         .parts = &rpm8660_switch_parts,
 463 };
 464
 465 /*
 466  * PM8901 regulators
 467  */
 468 static const struct qcom_rpm_reg pm8901_pldo = {
 469         .desc.linear_ranges = pldo_ranges,
 470         .desc.n_linear_ranges = ARRAY_SIZE(pldo_ranges),
 471         .desc.n_voltages = 161,
 472         .desc.ops = &mV_ops,
 473         .parts = &rpm8660_ldo_parts,
 474         .supports_force_mode_auto = false,
 475         .supports_force_mode_bypass = true,
 476 };
 477
 478 static const struct qcom_rpm_reg pm8901_nldo = {
 479         .desc.linear_ranges = nldo_ranges,
 480         .desc.n_linear_ranges = ARRAY_SIZE(nldo_ranges),
 481         .desc.n_voltages = 64,
 482         .desc.ops = &mV_ops,
 483         .parts = &rpm8660_ldo_parts,
 484         .supports_force_mode_auto = false,
 485         .supports_force_mode_bypass = true,
 486 };
 487
 488 static const struct qcom_rpm_reg pm8901_ftsmps = {
 489         .desc.linear_ranges = ftsmps_ranges,
 490         .desc.n_linear_ranges = ARRAY_SIZE(ftsmps_ranges),
 491         .desc.n_voltages = 101,
 492         .desc.ops = &mV_ops,
 493         .parts = &rpm8660_smps_parts,
 494         .supports_force_mode_auto = true,
 495         .supports_force_mode_bypass = false,
 496 };
 497
 498 static const struct qcom_rpm_reg pm8901_switch = {
 499         .desc.ops = &switch_ops,
 500         .parts = &rpm8660_switch_parts,
 501 };
 502
 503 /*
 504  * PM8921 regulators
 505  */
 506 static const struct qcom_rpm_reg pm8921_pldo = {
 507         .desc.linear_ranges = pldo_ranges,
 508         .desc.n_linear_ranges = ARRAY_SIZE(pldo_ranges),
 509         .desc.n_voltages = 161,
 510         .desc.ops = &uV_ops,
 511         .parts = &rpm8960_ldo_parts,
 512         .supports_force_mode_auto = false,
 513         .supports_force_mode_bypass = true,
 514 };
 515
 516 static const struct qcom_rpm_reg pm8921_nldo = {
 517         .desc.linear_ranges = nldo_ranges,
 518         .desc.n_linear_ranges = ARRAY_SIZE(nldo_ranges),
 519         .desc.n_voltages = 64,
 520         .desc.ops = &uV_ops,
 521         .parts = &rpm8960_ldo_parts,
 522         .supports_force_mode_auto = false,
 523         .supports_force_mode_bypass = true,
 524 };
 525
 526 static const struct qcom_rpm_reg pm8921_nldo1200 = {
 527         .desc.linear_ranges = nldo1200_ranges,
 528         .desc.n_linear_ranges = ARRAY_SIZE(nldo1200_ranges),
 529         .desc.n_voltages = 124,
 530         .desc.ops = &uV_ops,
 531         .parts = &rpm8960_ldo_parts,
 532         .supports_force_mode_auto = false,
 533         .supports_force_mode_bypass = true,
 534 };
 535
 536 static const struct qcom_rpm_reg pm8921_smps = {
 537         .desc.linear_ranges = smps_ranges,
 538         .desc.n_linear_ranges = ARRAY_SIZE(smps_ranges),
 539         .desc.n_voltages = 154,
 540         .desc.ops = &uV_ops,
 541         .parts = &rpm8960_smps_parts,
 542         .supports_force_mode_auto = true,
 543         .supports_force_mode_bypass = false,
 544 };
 545
 546 static const struct qcom_rpm_reg pm8921_ftsmps = {
 547         .desc.linear_ranges = ftsmps_ranges,
 548         .desc.n_linear_ranges = ARRAY_SIZE(ftsmps_ranges),
 549         .desc.n_voltages = 101,
 550         .desc.ops = &uV_ops,
 551         .parts = &rpm8960_smps_parts,
 552         .supports_force_mode_auto = true,
 553         .supports_force_mode_bypass = false,
 554 };
 555
 556 static const struct qcom_rpm_reg pm8921_ncp = {
 557         .desc.linear_ranges = ncp_ranges,
 558         .desc.n_linear_ranges = ARRAY_SIZE(ncp_ranges),
 559         .desc.n_voltages = 32,
 560         .desc.ops = &uV_ops,
 561         .parts = &rpm8960_ncp_parts,
 562 };
 563
 564 static const struct qcom_rpm_reg pm8921_switch = {
 565         .desc.ops = &switch_ops,
 566         .parts = &rpm8960_switch_parts,
 567 };
 568
 569 static const struct qcom_rpm_reg smb208_smps = {
 570         .desc.linear_ranges = smb208_ranges,
 571         .desc.n_linear_ranges = ARRAY_SIZE(smb208_ranges),
 572         .desc.n_voltages = 235,
 573         .desc.ops = &uV_ops,
 574         .parts = &rpm8960_smps_parts,
 575         .supports_force_mode_auto = false,
 576         .supports_force_mode_bypass = false,
 577 };
 578
 579 static const struct of_device_id rpm_of_match[] = {
 580         { .compatible = "qcom,rpm-pm8058-pldo",     .data = &pm8058_pldo },
 581         { .compatible = "qcom,rpm-pm8058-nldo",     .data = &pm8058_nldo },
 582         { .compatible = "qcom,rpm-pm8058-smps",     .data = &pm8058_smps },
 583         { .compatible = "qcom,rpm-pm8058-ncp",      .data = &pm8058_ncp },
 584         { .compatible = "qcom,rpm-pm8058-switch",   .data = &pm8058_switch },
 585
 586         { .compatible = "qcom,rpm-pm8901-pldo",     .data = &pm8901_pldo },
 587         { .compatible = "qcom,rpm-pm8901-nldo",     .data = &pm8901_nldo },
 588         { .compatible = "qcom,rpm-pm8901-ftsmps",   .data = &pm8901_ftsmps },
 589         { .compatible = "qcom,rpm-pm8901-switch",   .data = &pm8901_switch },
 590
 591         { .compatible = "qcom,rpm-pm8921-pldo",     .data = &pm8921_pldo },
 592         { .compatible = "qcom,rpm-pm8921-nldo",     .data = &pm8921_nldo },
 593         { .compatible = "qcom,rpm-pm8921-nldo1200", .data = &pm8921_nldo1200 },
 594         { .compatible = "qcom,rpm-pm8921-smps",     .data = &pm8921_smps },
 595         { .compatible = "qcom,rpm-pm8921-ftsmps",   .data = &pm8921_ftsmps },
 596         { .compatible = "qcom,rpm-pm8921-ncp",      .data = &pm8921_ncp },
 597         { .compatible = "qcom,rpm-pm8921-switch",   .data = &pm8921_switch },
 598
 599         { .compatible = "qcom,rpm-smb208", .data = &smb208_smps },
 600         { }
 601 };
 602 MODULE_DEVICE_TABLE(of, rpm_of_match);
 603
 604 static int rpm_reg_set(struct qcom_rpm_reg *vreg,
 605                        const struct request_member *req,
 606                        const int value)
 607 {
 608         if (req->mask == 0 || (value << req->shift) & ~req->mask)
 609                 return -EINVAL;
 610
 611         vreg->val[req->word] &= ~req->mask;
 612         vreg->val[req->word] |= value << req->shift;
 613
 614         return 0;
 615 }
 616
 617 static int rpm_reg_of_parse_freq(struct device *dev, struct qcom_rpm_reg *vreg)
 618 {
 619         static const int freq_table[] = {
 620                 19200000, 9600000, 6400000, 4800000, 3840000, 3200000, 2740000,
 621                 2400000, 2130000, 1920000, 1750000, 1600000, 1480000, 1370000,
 622                 1280000, 1200000,
 623
 624         };
 625         const char *key;
 626         u32 freq;
 627         int ret;
 628         int i;
 629
 630         key = "qcom,switch-mode-frequency";
 631         ret = of_property_read_u32(dev->of_node, key, &freq);
 632         if (ret) {
 633                 dev_err(dev, "regulator requires %s property\n", key);
 634                 return -EINVAL;
 635         }
 636
 637         for (i = 0; i < ARRAY_SIZE(freq_table); i++) {
 638                 if (freq == freq_table[i]) {
 639                         rpm_reg_set(vreg, &vreg->parts->freq, i + 1);
 640                         return 0;
 641                 }
 642         }
 643
 644         dev_err(dev, "invalid frequency %d\n", freq);
 645         return -EINVAL;
 646 }
 647
 648 static int rpm_reg_probe(struct platform_device *pdev)
 649 {
 650         struct regulator_init_data *initdata;
 651         const struct qcom_rpm_reg *template;
 652         const struct of_device_id *match;
 653         struct regulator_config config = { };
 654         struct regulator_dev *rdev;
 655         struct qcom_rpm_reg *vreg;
 656         const char *key;
 657         u32 force_mode;
 658         bool pwm;
 659         u32 val;
 660         int ret;
 661
 662         match = of_match_device(rpm_of_match, &pdev->dev);
 663         template = match->data;
 664
 665         vreg = devm_kmalloc(&pdev->dev, sizeof(*vreg), GFP_KERNEL);
 666         if (!vreg) {
 667                 dev_err(&pdev->dev, "failed to allocate vreg\n");
 668                 return -ENOMEM;
 669         }
 670         memcpy(vreg, template, sizeof(*vreg));
 671         mutex_init(&vreg->lock);
 672         vreg->dev = &pdev->dev;
 673         vreg->desc.id = -1;
 674         vreg->desc.owner = THIS_MODULE;
 675         vreg->desc.type = REGULATOR_VOLTAGE;
 676         vreg->desc.name = pdev->dev.of_node->name;
 677
 678         vreg->rpm = dev_get_drvdata(pdev->dev.parent);
 679         if (!vreg->rpm) {
 680                 dev_err(&pdev->dev, "unable to retrieve handle to rpm\n");
 681                 return -ENODEV;
 682         }
 683
 684         initdata = of_get_regulator_init_data(&pdev->dev, pdev->dev.of_node,
 685                                               &vreg->desc);
 686         if (!initdata)
 687                 return -EINVAL;
 688
 689         key = "reg";
 690         ret = of_property_read_u32(pdev->dev.of_node, key, &val);
 691         if (ret) {
 692                 dev_err(&pdev->dev, "failed to read %s\n", key);
 693                 return ret;
 694         }
 695         vreg->resource = val;
 696
 697         if ((vreg->parts->uV.mask || vreg->parts->mV.mask) &&
 698             (!initdata->constraints.min_uV || !initdata->constraints.max_uV)) {
 699                 dev_err(&pdev->dev, "no voltage specified for regulator\n");
 700                 return -EINVAL;
 701         }
 702
 703         key = "bias-pull-down";
 704         if (of_property_read_bool(pdev->dev.of_node, key)) {
 705                 ret = rpm_reg_set(vreg, &vreg->parts->pd, 1);
 706                 if (ret) {
 707                         dev_err(&pdev->dev, "%s is invalid", key);
 708                         return ret;
 709                 }
 710         }
 711
 712         if (vreg->parts->freq.mask) {
 713                 ret = rpm_reg_of_parse_freq(&pdev->dev, vreg);
 714                 if (ret < 0)
 715                         return ret;
 716         }
 717
 718         if (vreg->parts->pm.mask) {
 719                 key = "qcom,power-mode-hysteretic";
 720                 pwm = !of_property_read_bool(pdev->dev.of_node, key);
 721
 722                 ret = rpm_reg_set(vreg, &vreg->parts->pm, pwm);
 723                 if (ret) {
 724                         dev_err(&pdev->dev, "failed to set power mode\n");
 725                         return ret;
 726                 }
 727         }
 728
 729         if (vreg->parts->fm.mask) {
 730                 force_mode = -1;
 731
 732                 key = "qcom,force-mode";
 733                 ret = of_property_read_u32(pdev->dev.of_node, key, &val);
 734                 if (ret == -EINVAL) {
 735                         val = QCOM_RPM_FORCE_MODE_NONE;
 736                 } else if (ret < 0) {
 737                         dev_err(&pdev->dev, "failed to read %s\n", key);
 738                         return ret;
 739                 }
 740
 741                 /*
 742                  * If force-mode is encoded as 2 bits then the
 743                  * possible register values are:
 744                  * NONE, LPM, HPM
 745                  * otherwise:
 746                  * NONE, LPM, AUTO, HPM, BYPASS
 747                  */
 748                 switch (val) {
 749                 case QCOM_RPM_FORCE_MODE_NONE:
 750                         force_mode = 0;
 751                         break;
 752                 case QCOM_RPM_FORCE_MODE_LPM:
 753                         force_mode = 1;
 754                         break;
 755                 case QCOM_RPM_FORCE_MODE_HPM:
 756                         if (FORCE_MODE_IS_2_BITS(vreg))
 757                                 force_mode = 2;
 758                         else
 759                                 force_mode = 3;
 760                         break;
 761                 case QCOM_RPM_FORCE_MODE_AUTO:
 762                         if (vreg->supports_force_mode_auto)
 763                                 force_mode = 2;
 764                         break;
 765                 case QCOM_RPM_FORCE_MODE_BYPASS:
 766                         if (vreg->supports_force_mode_bypass)
 767                                 force_mode = 4;
 768                         break;
 769                 }
 770
 771                 if (force_mode < 0) {
 772                         dev_err(&pdev->dev, "invalid force mode\n");
 773                         return -EINVAL;
 774                 }
 775
 776                 ret = rpm_reg_set(vreg, &vreg->parts->fm, force_mode);
 777                 if (ret) {
 778                         dev_err(&pdev->dev, "failed to set force mode\n");
 779                         return ret;
 780                 }
 781         }
 782
 783         config.dev = &pdev->dev;
 784         config.init_data = initdata;
 785         config.driver_data = vreg;
 786         config.of_node = pdev->dev.of_node;
 787         rdev = devm_regulator_register(&pdev->dev, &vreg->desc, &config);
 788         if (IS_ERR(rdev)) {
 789                 dev_err(&pdev->dev, "can't register regulator\n");
 790                 return PTR_ERR(rdev);
 791         }
 792
 793         return 0;
 794 }
 795
 796 static struct platform_driver rpm_reg_driver = {
 797         .probe          = rpm_reg_probe,
 798         .driver  = {
 799                 .name  = "qcom_rpm_reg",
 800                 .owner = THIS_MODULE,
 801                 .of_match_table = of_match_ptr(rpm_of_match),
 802         },
 803 };
 804
 805 static int __init rpm_reg_init(void)
 806 {
 807         return platform_driver_register(&rpm_reg_driver);
 808 }
 809 subsys_initcall(rpm_reg_init);
 810
 811 static void __exit rpm_reg_exit(void)
 812 {
 813         platform_driver_unregister(&rpm_reg_driver);
 814 }
 815 module_exit(rpm_reg_exit)
 816
 817 MODULE_DESCRIPTION("Qualcomm RPM regulator driver");
 818 MODULE_LICENSE("GPL v2");