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