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                               QCOM_RPM_ACTIVE_STATE,
 209                               vreg->resource,
 210                               vreg->val,
 211                               vreg->parts->request_len);
 212 }
 213
 214 static int rpm_reg_set_mV_sel(struct regulator_dev *rdev,
 215                               unsigned selector)
 216 {
 217         struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
 218         const struct rpm_reg_parts *parts = vreg->parts;
 219         const struct request_member *req = &parts->mV;
 220         int ret = 0;
 221         int uV;
 222
 223         if (req->mask == 0)
 224                 return -EINVAL;
 225
 226         uV = regulator_list_voltage_linear_range(rdev, selector);
 227         if (uV < 0)
 228                 return uV;
 229
 230         mutex_lock(&vreg->lock);
 231         if (vreg->is_enabled)
 232                 ret = rpm_reg_write(vreg, req, uV / 1000);
 233
 234         if (!ret)
 235                 vreg->uV = uV;
 236         mutex_unlock(&vreg->lock);
 237
 238         return ret;
 239 }
 240
 241 static int rpm_reg_set_uV_sel(struct regulator_dev *rdev,
 242                               unsigned selector)
 243 {
 244         struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
 245         const struct rpm_reg_parts *parts = vreg->parts;
 246         const struct request_member *req = &parts->uV;
 247         int ret = 0;
 248         int uV;
 249
 250         if (req->mask == 0)
 251                 return -EINVAL;
 252
 253         uV = regulator_list_voltage_linear_range(rdev, selector);
 254         if (uV < 0)
 255                 return uV;
 256
 257         mutex_lock(&vreg->lock);
 258         if (vreg->is_enabled)
 259                 ret = rpm_reg_write(vreg, req, uV);
 260
 261         if (!ret)
 262                 vreg->uV = uV;
 263         mutex_unlock(&vreg->lock);
 264
 265         return ret;
 266 }
 267
 268 static int rpm_reg_get_voltage(struct regulator_dev *rdev)
 269 {
 270         struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
 271
 272         return vreg->uV;
 273 }
 274
 275 static int rpm_reg_mV_enable(struct regulator_dev *rdev)
 276 {
 277         struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
 278         const struct rpm_reg_parts *parts = vreg->parts;
 279         const struct request_member *req = &parts->mV;
 280         int ret;
 281
 282         if (req->mask == 0)
 283                 return -EINVAL;
 284
 285         mutex_lock(&vreg->lock);
 286         ret = rpm_reg_write(vreg, req, vreg->uV / 1000);
 287         if (!ret)
 288                 vreg->is_enabled = 1;
 289         mutex_unlock(&vreg->lock);
 290
 291         return ret;
 292 }
 293
 294 static int rpm_reg_uV_enable(struct regulator_dev *rdev)
 295 {
 296         struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
 297         const struct rpm_reg_parts *parts = vreg->parts;
 298         const struct request_member *req = &parts->uV;
 299         int ret;
 300
 301         if (req->mask == 0)
 302                 return -EINVAL;
 303
 304         mutex_lock(&vreg->lock);
 305         ret = rpm_reg_write(vreg, req, vreg->uV);
 306         if (!ret)
 307                 vreg->is_enabled = 1;
 308         mutex_unlock(&vreg->lock);
 309
 310         return ret;
 311 }
 312
 313 static int rpm_reg_switch_enable(struct regulator_dev *rdev)
 314 {
 315         struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
 316         const struct rpm_reg_parts *parts = vreg->parts;
 317         const struct request_member *req = &parts->enable_state;
 318         int ret;
 319
 320         if (req->mask == 0)
 321                 return -EINVAL;
 322
 323         mutex_lock(&vreg->lock);
 324         ret = rpm_reg_write(vreg, req, 1);
 325         if (!ret)
 326                 vreg->is_enabled = 1;
 327         mutex_unlock(&vreg->lock);
 328
 329         return ret;
 330 }
 331
 332 static int rpm_reg_mV_disable(struct regulator_dev *rdev)
 333 {
 334         struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
 335         const struct rpm_reg_parts *parts = vreg->parts;
 336         const struct request_member *req = &parts->mV;
 337         int ret;
 338
 339         if (req->mask == 0)
 340                 return -EINVAL;
 341
 342         mutex_lock(&vreg->lock);
 343         ret = rpm_reg_write(vreg, req, 0);
 344         if (!ret)
 345                 vreg->is_enabled = 0;
 346         mutex_unlock(&vreg->lock);
 347
 348         return ret;
 349 }
 350
 351 static int rpm_reg_uV_disable(struct regulator_dev *rdev)
 352 {
 353         struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
 354         const struct rpm_reg_parts *parts = vreg->parts;
 355         const struct request_member *req = &parts->uV;
 356         int ret;
 357
 358         if (req->mask == 0)
 359                 return -EINVAL;
 360
 361         mutex_lock(&vreg->lock);
 362         ret = rpm_reg_write(vreg, req, 0);
 363         if (!ret)
 364                 vreg->is_enabled = 0;
 365         mutex_unlock(&vreg->lock);
 366
 367         return ret;
 368 }
 369
 370 static int rpm_reg_switch_disable(struct regulator_dev *rdev)
 371 {
 372         struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
 373         const struct rpm_reg_parts *parts = vreg->parts;
 374         const struct request_member *req = &parts->enable_state;
 375         int ret;
 376
 377         if (req->mask == 0)
 378                 return -EINVAL;
 379
 380         mutex_lock(&vreg->lock);
 381         ret = rpm_reg_write(vreg, req, 0);
 382         if (!ret)
 383                 vreg->is_enabled = 0;
 384         mutex_unlock(&vreg->lock);
 385
 386         return ret;
 387 }
 388
 389 static int rpm_reg_is_enabled(struct regulator_dev *rdev)
 390 {
 391         struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
 392
 393         return vreg->is_enabled;
 394 }
 395
 396 static struct regulator_ops uV_ops = {
 397         .list_voltage = regulator_list_voltage_linear_range,
 398
 399         .set_voltage_sel = rpm_reg_set_uV_sel,
 400         .get_voltage = rpm_reg_get_voltage,
 401
 402         .enable = rpm_reg_uV_enable,
 403         .disable = rpm_reg_uV_disable,
 404         .is_enabled = rpm_reg_is_enabled,
 405 };
 406
 407 static struct regulator_ops mV_ops = {
 408         .list_voltage = regulator_list_voltage_linear_range,
 409
 410         .set_voltage_sel = rpm_reg_set_mV_sel,
 411         .get_voltage = rpm_reg_get_voltage,
 412
 413         .enable = rpm_reg_mV_enable,
 414         .disable = rpm_reg_mV_disable,
 415         .is_enabled = rpm_reg_is_enabled,
 416 };
 417
 418 static struct regulator_ops switch_ops = {
 419         .enable = rpm_reg_switch_enable,
 420         .disable = rpm_reg_switch_disable,
 421         .is_enabled = rpm_reg_is_enabled,
 422 };
 423
 424 /*
 425  * PM8058 regulators
 426  */
 427 static const struct qcom_rpm_reg pm8058_pldo = {
 428         .desc.linear_ranges = pldo_ranges,
 429         .desc.n_linear_ranges = ARRAY_SIZE(pldo_ranges),
 430         .desc.n_voltages = 161,
 431         .desc.ops = &mV_ops,
 432         .parts = &rpm8660_ldo_parts,
 433         .supports_force_mode_auto = false,
 434         .supports_force_mode_bypass = false,
 435 };
 436
 437 static const struct qcom_rpm_reg pm8058_nldo = {
 438         .desc.linear_ranges = nldo_ranges,
 439         .desc.n_linear_ranges = ARRAY_SIZE(nldo_ranges),
 440         .desc.n_voltages = 64,
 441         .desc.ops = &mV_ops,
 442         .parts = &rpm8660_ldo_parts,
 443         .supports_force_mode_auto = false,
 444         .supports_force_mode_bypass = false,
 445 };
 446
 447 static const struct qcom_rpm_reg pm8058_smps = {
 448         .desc.linear_ranges = smps_ranges,
 449         .desc.n_linear_ranges = ARRAY_SIZE(smps_ranges),
 450         .desc.n_voltages = 154,
 451         .desc.ops = &mV_ops,
 452         .parts = &rpm8660_smps_parts,
 453         .supports_force_mode_auto = false,
 454         .supports_force_mode_bypass = false,
 455 };
 456
 457 static const struct qcom_rpm_reg pm8058_ncp = {
 458         .desc.linear_ranges = ncp_ranges,
 459         .desc.n_linear_ranges = ARRAY_SIZE(ncp_ranges),
 460         .desc.n_voltages = 32,
 461         .desc.ops = &mV_ops,
 462         .parts = &rpm8660_ncp_parts,
 463 };
 464
 465 static const struct qcom_rpm_reg pm8058_switch = {
 466         .desc.ops = &switch_ops,
 467         .parts = &rpm8660_switch_parts,
 468 };
 469
 470 /*
 471  * PM8901 regulators
 472  */
 473 static const struct qcom_rpm_reg pm8901_pldo = {
 474         .desc.linear_ranges = pldo_ranges,
 475         .desc.n_linear_ranges = ARRAY_SIZE(pldo_ranges),
 476         .desc.n_voltages = 161,
 477         .desc.ops = &mV_ops,
 478         .parts = &rpm8660_ldo_parts,
 479         .supports_force_mode_auto = false,
 480         .supports_force_mode_bypass = true,
 481 };
 482
 483 static const struct qcom_rpm_reg pm8901_nldo = {
 484         .desc.linear_ranges = nldo_ranges,
 485         .desc.n_linear_ranges = ARRAY_SIZE(nldo_ranges),
 486         .desc.n_voltages = 64,
 487         .desc.ops = &mV_ops,
 488         .parts = &rpm8660_ldo_parts,
 489         .supports_force_mode_auto = false,
 490         .supports_force_mode_bypass = true,
 491 };
 492
 493 static const struct qcom_rpm_reg pm8901_ftsmps = {
 494         .desc.linear_ranges = ftsmps_ranges,
 495         .desc.n_linear_ranges = ARRAY_SIZE(ftsmps_ranges),
 496         .desc.n_voltages = 101,
 497         .desc.ops = &mV_ops,
 498         .parts = &rpm8660_smps_parts,
 499         .supports_force_mode_auto = true,
 500         .supports_force_mode_bypass = false,
 501 };
 502
 503 static const struct qcom_rpm_reg pm8901_switch = {
 504         .desc.ops = &switch_ops,
 505         .parts = &rpm8660_switch_parts,
 506 };
 507
 508 /*
 509  * PM8921 regulators
 510  */
 511 static const struct qcom_rpm_reg pm8921_pldo = {
 512         .desc.linear_ranges = pldo_ranges,
 513         .desc.n_linear_ranges = ARRAY_SIZE(pldo_ranges),
 514         .desc.n_voltages = 161,
 515         .desc.ops = &uV_ops,
 516         .parts = &rpm8960_ldo_parts,
 517         .supports_force_mode_auto = false,
 518         .supports_force_mode_bypass = true,
 519 };
 520
 521 static const struct qcom_rpm_reg pm8921_nldo = {
 522         .desc.linear_ranges = nldo_ranges,
 523         .desc.n_linear_ranges = ARRAY_SIZE(nldo_ranges),
 524         .desc.n_voltages = 64,
 525         .desc.ops = &uV_ops,
 526         .parts = &rpm8960_ldo_parts,
 527         .supports_force_mode_auto = false,
 528         .supports_force_mode_bypass = true,
 529 };
 530
 531 static const struct qcom_rpm_reg pm8921_nldo1200 = {
 532         .desc.linear_ranges = nldo1200_ranges,
 533         .desc.n_linear_ranges = ARRAY_SIZE(nldo1200_ranges),
 534         .desc.n_voltages = 124,
 535         .desc.ops = &uV_ops,
 536         .parts = &rpm8960_ldo_parts,
 537         .supports_force_mode_auto = false,
 538         .supports_force_mode_bypass = true,
 539 };
 540
 541 static const struct qcom_rpm_reg pm8921_smps = {
 542         .desc.linear_ranges = smps_ranges,
 543         .desc.n_linear_ranges = ARRAY_SIZE(smps_ranges),
 544         .desc.n_voltages = 154,
 545         .desc.ops = &uV_ops,
 546         .parts = &rpm8960_smps_parts,
 547         .supports_force_mode_auto = true,
 548         .supports_force_mode_bypass = false,
 549 };
 550
 551 static const struct qcom_rpm_reg pm8921_ftsmps = {
 552         .desc.linear_ranges = ftsmps_ranges,
 553         .desc.n_linear_ranges = ARRAY_SIZE(ftsmps_ranges),
 554         .desc.n_voltages = 101,
 555         .desc.ops = &uV_ops,
 556         .parts = &rpm8960_smps_parts,
 557         .supports_force_mode_auto = true,
 558         .supports_force_mode_bypass = false,
 559 };
 560
 561 static const struct qcom_rpm_reg pm8921_ncp = {
 562         .desc.linear_ranges = ncp_ranges,
 563         .desc.n_linear_ranges = ARRAY_SIZE(ncp_ranges),
 564         .desc.n_voltages = 32,
 565         .desc.ops = &uV_ops,
 566         .parts = &rpm8960_ncp_parts,
 567 };
 568
 569 static const struct qcom_rpm_reg pm8921_switch = {
 570         .desc.ops = &switch_ops,
 571         .parts = &rpm8960_switch_parts,
 572 };
 573
 574 static const struct qcom_rpm_reg smb208_smps = {
 575         .desc.linear_ranges = smb208_ranges,
 576         .desc.n_linear_ranges = ARRAY_SIZE(smb208_ranges),
 577         .desc.n_voltages = 235,
 578         .desc.ops = &uV_ops,
 579         .parts = &rpm8960_smps_parts,
 580         .supports_force_mode_auto = false,
 581         .supports_force_mode_bypass = false,
 582 };
 583
 584 static const struct of_device_id rpm_of_match[] = {
 585         { .compatible = "qcom,rpm-pm8058-pldo",     .data = &pm8058_pldo },
 586         { .compatible = "qcom,rpm-pm8058-nldo",     .data = &pm8058_nldo },
 587         { .compatible = "qcom,rpm-pm8058-smps",     .data = &pm8058_smps },
 588         { .compatible = "qcom,rpm-pm8058-ncp",      .data = &pm8058_ncp },
 589         { .compatible = "qcom,rpm-pm8058-switch",   .data = &pm8058_switch },
 590
 591         { .compatible = "qcom,rpm-pm8901-pldo",     .data = &pm8901_pldo },
 592         { .compatible = "qcom,rpm-pm8901-nldo",     .data = &pm8901_nldo },
 593         { .compatible = "qcom,rpm-pm8901-ftsmps",   .data = &pm8901_ftsmps },
 594         { .compatible = "qcom,rpm-pm8901-switch",   .data = &pm8901_switch },
 595
 596         { .compatible = "qcom,rpm-pm8921-pldo",     .data = &pm8921_pldo },
 597         { .compatible = "qcom,rpm-pm8921-nldo",     .data = &pm8921_nldo },
 598         { .compatible = "qcom,rpm-pm8921-nldo1200", .data = &pm8921_nldo1200 },
 599         { .compatible = "qcom,rpm-pm8921-smps",     .data = &pm8921_smps },
 600         { .compatible = "qcom,rpm-pm8921-ftsmps",   .data = &pm8921_ftsmps },
 601         { .compatible = "qcom,rpm-pm8921-ncp",      .data = &pm8921_ncp },
 602         { .compatible = "qcom,rpm-pm8921-switch",   .data = &pm8921_switch },
 603
 604         { .compatible = "qcom,rpm-smb208", .data = &smb208_smps },
 605         { }
 606 };
 607 MODULE_DEVICE_TABLE(of, rpm_of_match);
 608
 609 static int rpm_reg_set(struct qcom_rpm_reg *vreg,
 610                        const struct request_member *req,
 611                        const int value)
 612 {
 613         if (req->mask == 0 || (value << req->shift) & ~req->mask)
 614                 return -EINVAL;
 615
 616         vreg->val[req->word] &= ~req->mask;
 617         vreg->val[req->word] |= value << req->shift;
 618
 619         return 0;
 620 }
 621
 622 static int rpm_reg_of_parse_freq(struct device *dev, struct qcom_rpm_reg *vreg)
 623 {
 624         static const int freq_table[] = {
 625                 19200000, 9600000, 6400000, 4800000, 3840000, 3200000, 2740000,
 626                 2400000, 2130000, 1920000, 1750000, 1600000, 1480000, 1370000,
 627                 1280000, 1200000,
 628
 629         };
 630         const char *key;
 631         u32 freq;
 632         int ret;
 633         int i;
 634
 635         key = "qcom,switch-mode-frequency";
 636         ret = of_property_read_u32(dev->of_node, key, &freq);
 637         if (ret) {
 638                 dev_err(dev, "regulator requires %s property\n", key);
 639                 return -EINVAL;
 640         }
 641
 642         for (i = 0; i < ARRAY_SIZE(freq_table); i++) {
 643                 if (freq == freq_table[i]) {
 644                         rpm_reg_set(vreg, &vreg->parts->freq, i + 1);
 645                         return 0;
 646                 }
 647         }
 648
 649         dev_err(dev, "invalid frequency %d\n", freq);
 650         return -EINVAL;
 651 }
 652
 653 static int rpm_reg_probe(struct platform_device *pdev)
 654 {
 655         struct regulator_init_data *initdata;
 656         const struct qcom_rpm_reg *template;
 657         const struct of_device_id *match;
 658         struct regulator_config config = { };
 659         struct regulator_dev *rdev;
 660         struct qcom_rpm_reg *vreg;
 661         const char *key;
 662         u32 force_mode;
 663         bool pwm;
 664         u32 val;
 665         int ret;
 666
 667         match = of_match_device(rpm_of_match, &pdev->dev);
 668         template = match->data;
 669
 670         vreg = devm_kmalloc(&pdev->dev, sizeof(*vreg), GFP_KERNEL);
 671         if (!vreg) {
 672                 dev_err(&pdev->dev, "failed to allocate vreg\n");
 673                 return -ENOMEM;
 674         }
 675         memcpy(vreg, template, sizeof(*vreg));
 676         mutex_init(&vreg->lock);
 677         vreg->dev = &pdev->dev;
 678         vreg->desc.id = -1;
 679         vreg->desc.owner = THIS_MODULE;
 680         vreg->desc.type = REGULATOR_VOLTAGE;
 681         vreg->desc.name = pdev->dev.of_node->name;
 682         vreg->desc.supply_name = "vin";
 683
 684         vreg->rpm = dev_get_drvdata(pdev->dev.parent);
 685         if (!vreg->rpm) {
 686                 dev_err(&pdev->dev, "unable to retrieve handle to rpm\n");
 687                 return -ENODEV;
 688         }
 689
 690         initdata = of_get_regulator_init_data(&pdev->dev, pdev->dev.of_node,
 691                                               &vreg->desc);
 692         if (!initdata)
 693                 return -EINVAL;
 694
 695         key = "reg";
 696         ret = of_property_read_u32(pdev->dev.of_node, key, &val);
 697         if (ret) {
 698                 dev_err(&pdev->dev, "failed to read %s\n", key);
 699                 return ret;
 700         }
 701         vreg->resource = val;
 702
 703         if ((vreg->parts->uV.mask || vreg->parts->mV.mask) &&
 704             (!initdata->constraints.min_uV || !initdata->constraints.max_uV)) {
 705                 dev_err(&pdev->dev, "no voltage specified for regulator\n");
 706                 return -EINVAL;
 707         }
 708
 709         key = "bias-pull-down";
 710         if (of_property_read_bool(pdev->dev.of_node, key)) {
 711                 ret = rpm_reg_set(vreg, &vreg->parts->pd, 1);
 712                 if (ret) {
 713                         dev_err(&pdev->dev, "%s is invalid", key);
 714                         return ret;
 715                 }
 716         }
 717
 718         if (vreg->parts->freq.mask) {
 719                 ret = rpm_reg_of_parse_freq(&pdev->dev, vreg);
 720                 if (ret < 0)
 721                         return ret;
 722         }
 723
 724         if (vreg->parts->pm.mask) {
 725                 key = "qcom,power-mode-hysteretic";
 726                 pwm = !of_property_read_bool(pdev->dev.of_node, key);
 727
 728                 ret = rpm_reg_set(vreg, &vreg->parts->pm, pwm);
 729                 if (ret) {
 730                         dev_err(&pdev->dev, "failed to set power mode\n");
 731                         return ret;
 732                 }
 733         }
 734
 735         if (vreg->parts->fm.mask) {
 736                 force_mode = -1;
 737
 738                 key = "qcom,force-mode";
 739                 ret = of_property_read_u32(pdev->dev.of_node, key, &val);
 740                 if (ret == -EINVAL) {
 741                         val = QCOM_RPM_FORCE_MODE_NONE;
 742                 } else if (ret < 0) {
 743                         dev_err(&pdev->dev, "failed to read %s\n", key);
 744                         return ret;
 745                 }
 746
 747                 /*
 748                  * If force-mode is encoded as 2 bits then the
 749                  * possible register values are:
 750                  * NONE, LPM, HPM
 751                  * otherwise:
 752                  * NONE, LPM, AUTO, HPM, BYPASS
 753                  */
 754                 switch (val) {
 755                 case QCOM_RPM_FORCE_MODE_NONE:
 756                         force_mode = 0;
 757                         break;
 758                 case QCOM_RPM_FORCE_MODE_LPM:
 759                         force_mode = 1;
 760                         break;
 761                 case QCOM_RPM_FORCE_MODE_HPM:
 762                         if (FORCE_MODE_IS_2_BITS(vreg))
 763                                 force_mode = 2;
 764                         else
 765                                 force_mode = 3;
 766                         break;
 767                 case QCOM_RPM_FORCE_MODE_AUTO:
 768                         if (vreg->supports_force_mode_auto)
 769                                 force_mode = 2;
 770                         break;
 771                 case QCOM_RPM_FORCE_MODE_BYPASS:
 772                         if (vreg->supports_force_mode_bypass)
 773                                 force_mode = 4;
 774                         break;
 775                 }
 776
 777                 if (force_mode == -1) {
 778                         dev_err(&pdev->dev, "invalid force mode\n");
 779                         return -EINVAL;
 780                 }
 781
 782                 ret = rpm_reg_set(vreg, &vreg->parts->fm, force_mode);
 783                 if (ret) {
 784                         dev_err(&pdev->dev, "failed to set force mode\n");
 785                         return ret;
 786                 }
 787         }
 788
 789         config.dev = &pdev->dev;
 790         config.init_data = initdata;
 791         config.driver_data = vreg;
 792         config.of_node = pdev->dev.of_node;
 793         rdev = devm_regulator_register(&pdev->dev, &vreg->desc, &config);
 794         if (IS_ERR(rdev)) {
 795                 dev_err(&pdev->dev, "can't register regulator\n");
 796                 return PTR_ERR(rdev);
 797         }
 798
 799         return 0;
 800 }
 801
 802 static struct platform_driver rpm_reg_driver = {
 803         .probe          = rpm_reg_probe,
 804         .driver  = {
 805                 .name  = "qcom_rpm_reg",
 806                 .of_match_table = of_match_ptr(rpm_of_match),
 807         },
 808 };
 809
 810 static int __init rpm_reg_init(void)
 811 {
 812         return platform_driver_register(&rpm_reg_driver);
 813 }
 814 subsys_initcall(rpm_reg_init);
 815
 816 static void __exit rpm_reg_exit(void)
 817 {
 818         platform_driver_unregister(&rpm_reg_driver);
 819 }
 820 module_exit(rpm_reg_exit)
 821
 822 MODULE_DESCRIPTION("Qualcomm RPM regulator driver");
 823 MODULE_LICENSE("GPL v2");