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 ncp_ranges[] = {
 187         REGULATOR_LINEAR_RANGE(1500000,   0,  31, 50000),
 188 };
 189
 190 static int rpm_reg_write(struct qcom_rpm_reg *vreg,
 191                          const struct request_member *req,
 192                          const int value)
 193 {
 194         if (WARN_ON((value << req->shift) & ~req->mask))
 195                 return -EINVAL;
 196
 197         vreg->val[req->word] &= ~req->mask;
 198         vreg->val[req->word] |= value << req->shift;
 199
 200         return qcom_rpm_write(vreg->rpm,
 201                               vreg->resource,
 202                               vreg->val,
 203                               vreg->parts->request_len);
 204 }
 205
 206 static int rpm_reg_set_mV_sel(struct regulator_dev *rdev,
 207                               unsigned selector)
 208 {
 209         struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
 210         const struct rpm_reg_parts *parts = vreg->parts;
 211         const struct request_member *req = &parts->mV;
 212         int ret = 0;
 213         int uV;
 214
 215         if (req->mask == 0)
 216                 return -EINVAL;
 217
 218         uV = regulator_list_voltage_linear_range(rdev, selector);
 219         if (uV < 0)
 220                 return uV;
 221
 222         mutex_lock(&vreg->lock);
 223         vreg->uV = uV;
 224         if (vreg->is_enabled)
 225                 ret = rpm_reg_write(vreg, req, vreg->uV / 1000);
 226         mutex_unlock(&vreg->lock);
 227
 228         return ret;
 229 }
 230
 231 static int rpm_reg_set_uV_sel(struct regulator_dev *rdev,
 232                               unsigned selector)
 233 {
 234         struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
 235         const struct rpm_reg_parts *parts = vreg->parts;
 236         const struct request_member *req = &parts->uV;
 237         int ret = 0;
 238         int uV;
 239
 240         if (req->mask == 0)
 241                 return -EINVAL;
 242
 243         uV = regulator_list_voltage_linear_range(rdev, selector);
 244         if (uV < 0)
 245                 return uV;
 246
 247         mutex_lock(&vreg->lock);
 248         vreg->uV = uV;
 249         if (vreg->is_enabled)
 250                 ret = rpm_reg_write(vreg, req, vreg->uV);
 251         mutex_unlock(&vreg->lock);
 252
 253         return ret;
 254 }
 255
 256 static int rpm_reg_get_voltage(struct regulator_dev *rdev)
 257 {
 258         struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
 259
 260         return vreg->uV;
 261 }
 262
 263 static int rpm_reg_mV_enable(struct regulator_dev *rdev)
 264 {
 265         struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
 266         const struct rpm_reg_parts *parts = vreg->parts;
 267         const struct request_member *req = &parts->mV;
 268         int ret;
 269
 270         if (req->mask == 0)
 271                 return -EINVAL;
 272
 273         mutex_lock(&vreg->lock);
 274         ret = rpm_reg_write(vreg, req, vreg->uV / 1000);
 275         if (!ret)
 276                 vreg->is_enabled = 1;
 277         mutex_unlock(&vreg->lock);
 278
 279         return ret;
 280 }
 281
 282 static int rpm_reg_uV_enable(struct regulator_dev *rdev)
 283 {
 284         struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
 285         const struct rpm_reg_parts *parts = vreg->parts;
 286         const struct request_member *req = &parts->uV;
 287         int ret;
 288
 289         if (req->mask == 0)
 290                 return -EINVAL;
 291
 292         mutex_lock(&vreg->lock);
 293         ret = rpm_reg_write(vreg, req, vreg->uV);
 294         if (!ret)
 295                 vreg->is_enabled = 1;
 296         mutex_unlock(&vreg->lock);
 297
 298         return ret;
 299 }
 300
 301 static int rpm_reg_switch_enable(struct regulator_dev *rdev)
 302 {
 303         struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
 304         const struct rpm_reg_parts *parts = vreg->parts;
 305         const struct request_member *req = &parts->enable_state;
 306         int ret;
 307
 308         if (req->mask == 0)
 309                 return -EINVAL;
 310
 311         mutex_lock(&vreg->lock);
 312         ret = rpm_reg_write(vreg, req, 1);
 313         if (!ret)
 314                 vreg->is_enabled = 1;
 315         mutex_unlock(&vreg->lock);
 316
 317         return ret;
 318 }
 319
 320 static int rpm_reg_mV_disable(struct regulator_dev *rdev)
 321 {
 322         struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
 323         const struct rpm_reg_parts *parts = vreg->parts;
 324         const struct request_member *req = &parts->mV;
 325         int ret;
 326
 327         if (req->mask == 0)
 328                 return -EINVAL;
 329
 330         mutex_lock(&vreg->lock);
 331         ret = rpm_reg_write(vreg, req, 0);
 332         if (!ret)
 333                 vreg->is_enabled = 0;
 334         mutex_unlock(&vreg->lock);
 335
 336         return ret;
 337 }
 338
 339 static int rpm_reg_uV_disable(struct regulator_dev *rdev)
 340 {
 341         struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
 342         const struct rpm_reg_parts *parts = vreg->parts;
 343         const struct request_member *req = &parts->uV;
 344         int ret;
 345
 346         if (req->mask == 0)
 347                 return -EINVAL;
 348
 349         mutex_lock(&vreg->lock);
 350         ret = rpm_reg_write(vreg, req, 0);
 351         if (!ret)
 352                 vreg->is_enabled = 0;
 353         mutex_unlock(&vreg->lock);
 354
 355         return ret;
 356 }
 357
 358 static int rpm_reg_switch_disable(struct regulator_dev *rdev)
 359 {
 360         struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
 361         const struct rpm_reg_parts *parts = vreg->parts;
 362         const struct request_member *req = &parts->enable_state;
 363         int ret;
 364
 365         if (req->mask == 0)
 366                 return -EINVAL;
 367
 368         mutex_lock(&vreg->lock);
 369         ret = rpm_reg_write(vreg, req, 0);
 370         if (!ret)
 371                 vreg->is_enabled = 0;
 372         mutex_unlock(&vreg->lock);
 373
 374         return ret;
 375 }
 376
 377 static int rpm_reg_is_enabled(struct regulator_dev *rdev)
 378 {
 379         struct qcom_rpm_reg *vreg = rdev_get_drvdata(rdev);
 380
 381         return vreg->is_enabled;
 382 }
 383
 384 static struct regulator_ops uV_ops = {
 385         .list_voltage = regulator_list_voltage_linear_range,
 386
 387         .set_voltage_sel = rpm_reg_set_uV_sel,
 388         .get_voltage = rpm_reg_get_voltage,
 389
 390         .enable = rpm_reg_uV_enable,
 391         .disable = rpm_reg_uV_disable,
 392         .is_enabled = rpm_reg_is_enabled,
 393 };
 394
 395 static struct regulator_ops mV_ops = {
 396         .list_voltage = regulator_list_voltage_linear_range,
 397
 398         .set_voltage_sel = rpm_reg_set_mV_sel,
 399         .get_voltage = rpm_reg_get_voltage,
 400
 401         .enable = rpm_reg_mV_enable,
 402         .disable = rpm_reg_mV_disable,
 403         .is_enabled = rpm_reg_is_enabled,
 404 };
 405
 406 static struct regulator_ops switch_ops = {
 407         .enable = rpm_reg_switch_enable,
 408         .disable = rpm_reg_switch_disable,
 409         .is_enabled = rpm_reg_is_enabled,
 410 };
 411
 412 /*
 413  * PM8058 regulators
 414  */
 415 static const struct qcom_rpm_reg pm8058_pldo = {
 416         .desc.linear_ranges = pldo_ranges,
 417         .desc.n_linear_ranges = ARRAY_SIZE(pldo_ranges),
 418         .desc.n_voltages = 161,
 419         .desc.ops = &mV_ops,
 420         .parts = &rpm8660_ldo_parts,
 421         .supports_force_mode_auto = false,
 422         .supports_force_mode_bypass = false,
 423 };
 424
 425 static const struct qcom_rpm_reg pm8058_nldo = {
 426         .desc.linear_ranges = nldo_ranges,
 427         .desc.n_linear_ranges = ARRAY_SIZE(nldo_ranges),
 428         .desc.n_voltages = 64,
 429         .desc.ops = &mV_ops,
 430         .parts = &rpm8660_ldo_parts,
 431         .supports_force_mode_auto = false,
 432         .supports_force_mode_bypass = false,
 433 };
 434
 435 static const struct qcom_rpm_reg pm8058_smps = {
 436         .desc.linear_ranges = smps_ranges,
 437         .desc.n_linear_ranges = ARRAY_SIZE(smps_ranges),
 438         .desc.n_voltages = 154,
 439         .desc.ops = &mV_ops,
 440         .parts = &rpm8660_smps_parts,
 441         .supports_force_mode_auto = false,
 442         .supports_force_mode_bypass = false,
 443 };
 444
 445 static const struct qcom_rpm_reg pm8058_ncp = {
 446         .desc.linear_ranges = ncp_ranges,
 447         .desc.n_linear_ranges = ARRAY_SIZE(ncp_ranges),
 448         .desc.n_voltages = 32,
 449         .desc.ops = &mV_ops,
 450         .parts = &rpm8660_ncp_parts,
 451 };
 452
 453 static const struct qcom_rpm_reg pm8058_switch = {
 454         .desc.ops = &switch_ops,
 455         .parts = &rpm8660_switch_parts,
 456 };
 457
 458 /*
 459  * PM8901 regulators
 460  */
 461 static const struct qcom_rpm_reg pm8901_pldo = {
 462         .desc.linear_ranges = pldo_ranges,
 463         .desc.n_linear_ranges = ARRAY_SIZE(pldo_ranges),
 464         .desc.n_voltages = 161,
 465         .desc.ops = &mV_ops,
 466         .parts = &rpm8660_ldo_parts,
 467         .supports_force_mode_auto = false,
 468         .supports_force_mode_bypass = true,
 469 };
 470
 471 static const struct qcom_rpm_reg pm8901_nldo = {
 472         .desc.linear_ranges = nldo_ranges,
 473         .desc.n_linear_ranges = ARRAY_SIZE(nldo_ranges),
 474         .desc.n_voltages = 64,
 475         .desc.ops = &mV_ops,
 476         .parts = &rpm8660_ldo_parts,
 477         .supports_force_mode_auto = false,
 478         .supports_force_mode_bypass = true,
 479 };
 480
 481 static const struct qcom_rpm_reg pm8901_ftsmps = {
 482         .desc.linear_ranges = ftsmps_ranges,
 483         .desc.n_linear_ranges = ARRAY_SIZE(ftsmps_ranges),
 484         .desc.n_voltages = 101,
 485         .desc.ops = &mV_ops,
 486         .parts = &rpm8660_smps_parts,
 487         .supports_force_mode_auto = true,
 488         .supports_force_mode_bypass = false,
 489 };
 490
 491 static const struct qcom_rpm_reg pm8901_switch = {
 492         .desc.ops = &switch_ops,
 493         .parts = &rpm8660_switch_parts,
 494 };
 495
 496 /*
 497  * PM8921 regulators
 498  */
 499 static const struct qcom_rpm_reg pm8921_pldo = {
 500         .desc.linear_ranges = pldo_ranges,
 501         .desc.n_linear_ranges = ARRAY_SIZE(pldo_ranges),
 502         .desc.n_voltages = 161,
 503         .desc.ops = &uV_ops,
 504         .parts = &rpm8960_ldo_parts,
 505         .supports_force_mode_auto = false,
 506         .supports_force_mode_bypass = true,
 507 };
 508
 509 static const struct qcom_rpm_reg pm8921_nldo = {
 510         .desc.linear_ranges = nldo_ranges,
 511         .desc.n_linear_ranges = ARRAY_SIZE(nldo_ranges),
 512         .desc.n_voltages = 64,
 513         .desc.ops = &uV_ops,
 514         .parts = &rpm8960_ldo_parts,
 515         .supports_force_mode_auto = false,
 516         .supports_force_mode_bypass = true,
 517 };
 518
 519 static const struct qcom_rpm_reg pm8921_nldo1200 = {
 520         .desc.linear_ranges = nldo1200_ranges,
 521         .desc.n_linear_ranges = ARRAY_SIZE(nldo1200_ranges),
 522         .desc.n_voltages = 124,
 523         .desc.ops = &uV_ops,
 524         .parts = &rpm8960_ldo_parts,
 525         .supports_force_mode_auto = false,
 526         .supports_force_mode_bypass = true,
 527 };
 528
 529 static const struct qcom_rpm_reg pm8921_smps = {
 530         .desc.linear_ranges = smps_ranges,
 531         .desc.n_linear_ranges = ARRAY_SIZE(smps_ranges),
 532         .desc.n_voltages = 154,
 533         .desc.ops = &uV_ops,
 534         .parts = &rpm8960_smps_parts,
 535         .supports_force_mode_auto = true,
 536         .supports_force_mode_bypass = false,
 537 };
 538
 539 static const struct qcom_rpm_reg pm8921_ftsmps = {
 540         .desc.linear_ranges = ftsmps_ranges,
 541         .desc.n_linear_ranges = ARRAY_SIZE(ftsmps_ranges),
 542         .desc.n_voltages = 101,
 543         .desc.ops = &uV_ops,
 544         .parts = &rpm8960_smps_parts,
 545         .supports_force_mode_auto = true,
 546         .supports_force_mode_bypass = false,
 547 };
 548
 549 static const struct qcom_rpm_reg pm8921_ncp = {
 550         .desc.linear_ranges = ncp_ranges,
 551         .desc.n_linear_ranges = ARRAY_SIZE(ncp_ranges),
 552         .desc.n_voltages = 32,
 553         .desc.ops = &uV_ops,
 554         .parts = &rpm8960_ncp_parts,
 555 };
 556
 557 static const struct qcom_rpm_reg pm8921_switch = {
 558         .desc.ops = &switch_ops,
 559         .parts = &rpm8960_switch_parts,
 560 };
 561
 562 static const struct of_device_id rpm_of_match[] = {
 563         { .compatible = "qcom,rpm-pm8058-pldo",     .data = &pm8058_pldo },
 564         { .compatible = "qcom,rpm-pm8058-nldo",     .data = &pm8058_nldo },
 565         { .compatible = "qcom,rpm-pm8058-smps",     .data = &pm8058_smps },
 566         { .compatible = "qcom,rpm-pm8058-ncp",      .data = &pm8058_ncp },
 567         { .compatible = "qcom,rpm-pm8058-switch",   .data = &pm8058_switch },
 568
 569         { .compatible = "qcom,rpm-pm8901-pldo",     .data = &pm8901_pldo },
 570         { .compatible = "qcom,rpm-pm8901-nldo",     .data = &pm8901_nldo },
 571         { .compatible = "qcom,rpm-pm8901-ftsmps",   .data = &pm8901_ftsmps },
 572         { .compatible = "qcom,rpm-pm8901-switch",   .data = &pm8901_switch },
 573
 574         { .compatible = "qcom,rpm-pm8921-pldo",     .data = &pm8921_pldo },
 575         { .compatible = "qcom,rpm-pm8921-nldo",     .data = &pm8921_nldo },
 576         { .compatible = "qcom,rpm-pm8921-nldo1200", .data = &pm8921_nldo1200 },
 577         { .compatible = "qcom,rpm-pm8921-smps",     .data = &pm8921_smps },
 578         { .compatible = "qcom,rpm-pm8921-ftsmps",   .data = &pm8921_ftsmps },
 579         { .compatible = "qcom,rpm-pm8921-ncp",      .data = &pm8921_ncp },
 580         { .compatible = "qcom,rpm-pm8921-switch",   .data = &pm8921_switch },
 581         { }
 582 };
 583 MODULE_DEVICE_TABLE(of, rpm_of_match);
 584
 585 static int rpm_reg_set(struct qcom_rpm_reg *vreg,
 586                        const struct request_member *req,
 587                        const int value)
 588 {
 589         if (req->mask == 0 || (value << req->shift) & ~req->mask)
 590                 return -EINVAL;
 591
 592         vreg->val[req->word] &= ~req->mask;
 593         vreg->val[req->word] |= value << req->shift;
 594
 595         return 0;
 596 }
 597
 598 static int rpm_reg_of_parse_freq(struct device *dev, struct qcom_rpm_reg *vreg)
 599 {
 600         static const int freq_table[] = {
 601                 19200000, 9600000, 6400000, 4800000, 3840000, 3200000, 2740000,
 602                 2400000, 2130000, 1920000, 1750000, 1600000, 1480000, 1370000,
 603                 1280000, 1200000,
 604
 605         };
 606         const char *key;
 607         u32 freq;
 608         int ret;
 609         int i;
 610
 611         key = "qcom,switch-mode-frequency";
 612         ret = of_property_read_u32(dev->of_node, key, &freq);
 613         if (ret) {
 614                 dev_err(dev, "regulator requires %s property\n", key);
 615                 return -EINVAL;
 616         }
 617
 618         for (i = 0; i < ARRAY_SIZE(freq_table); i++) {
 619                 if (freq == freq_table[i]) {
 620                         rpm_reg_set(vreg, &vreg->parts->freq, i + 1);
 621                         return 0;
 622                 }
 623         }
 624
 625         dev_err(dev, "invalid frequency %d\n", freq);
 626         return -EINVAL;
 627 }
 628
 629 static int rpm_reg_probe(struct platform_device *pdev)
 630 {
 631         struct regulator_init_data *initdata;
 632         const struct qcom_rpm_reg *template;
 633         const struct of_device_id *match;
 634         struct regulator_config config = { };
 635         struct regulator_dev *rdev;
 636         struct qcom_rpm_reg *vreg;
 637         const char *key;
 638         u32 force_mode;
 639         bool pwm;
 640         u32 val;
 641         int ret;
 642
 643         match = of_match_device(rpm_of_match, &pdev->dev);
 644         template = match->data;
 645
 646         initdata = of_get_regulator_init_data(&pdev->dev, pdev->dev.of_node);
 647         if (!initdata)
 648                 return -EINVAL;
 649
 650         vreg = devm_kmalloc(&pdev->dev, sizeof(*vreg), GFP_KERNEL);
 651         if (!vreg) {
 652                 dev_err(&pdev->dev, "failed to allocate vreg\n");
 653                 return -ENOMEM;
 654         }
 655         memcpy(vreg, template, sizeof(*vreg));
 656         mutex_init(&vreg->lock);
 657         vreg->dev = &pdev->dev;
 658         vreg->desc.id = -1;
 659         vreg->desc.owner = THIS_MODULE;
 660         vreg->desc.type = REGULATOR_VOLTAGE;
 661         vreg->desc.name = pdev->dev.of_node->name;
 662
 663         vreg->rpm = dev_get_drvdata(pdev->dev.parent);
 664         if (!vreg->rpm) {
 665                 dev_err(&pdev->dev, "unable to retrieve handle to rpm\n");
 666                 return -ENODEV;
 667         }
 668
 669         key = "reg";
 670         ret = of_property_read_u32(pdev->dev.of_node, key, &val);
 671         if (ret) {
 672                 dev_err(&pdev->dev, "failed to read %s\n", key);
 673                 return ret;
 674         }
 675         vreg->resource = val;
 676
 677         if ((vreg->parts->uV.mask || vreg->parts->mV.mask) &&
 678             (!initdata->constraints.min_uV || !initdata->constraints.max_uV)) {
 679                 dev_err(&pdev->dev, "no voltage specified for regulator\n");
 680                 return -EINVAL;
 681         }
 682
 683         key = "bias-pull-down";
 684         if (of_property_read_bool(pdev->dev.of_node, key)) {
 685                 ret = rpm_reg_set(vreg, &vreg->parts->pd, 1);
 686                 if (ret) {
 687                         dev_err(&pdev->dev, "%s is invalid", key);
 688                         return ret;
 689                 }
 690         }
 691
 692         if (vreg->parts->freq.mask) {
 693                 ret = rpm_reg_of_parse_freq(&pdev->dev, vreg);
 694                 if (ret < 0)
 695                         return ret;
 696         }
 697
 698         if (vreg->parts->pm.mask) {
 699                 key = "qcom,power-mode-hysteretic";
 700                 pwm = !of_property_read_bool(pdev->dev.of_node, key);
 701
 702                 ret = rpm_reg_set(vreg, &vreg->parts->pm, pwm);
 703                 if (ret) {
 704                         dev_err(&pdev->dev, "failed to set power mode\n");
 705                         return ret;
 706                 }
 707         }
 708
 709         if (vreg->parts->fm.mask) {
 710                 force_mode = -1;
 711
 712                 key = "qcom,force-mode";
 713                 ret = of_property_read_u32(pdev->dev.of_node, key, &val);
 714                 if (ret == -EINVAL) {
 715                         val = QCOM_RPM_FORCE_MODE_NONE;
 716                 } else if (ret < 0) {
 717                         dev_err(&pdev->dev, "failed to read %s\n", key);
 718                         return ret;
 719                 }
 720
 721                 /*
 722                  * If force-mode is encoded as 2 bits then the
 723                  * possible register values are:
 724                  * NONE, LPM, HPM
 725                  * otherwise:
 726                  * NONE, LPM, AUTO, HPM, BYPASS
 727                  */
 728                 switch (val) {
 729                 case QCOM_RPM_FORCE_MODE_NONE:
 730                         force_mode = 0;
 731                         break;
 732                 case QCOM_RPM_FORCE_MODE_LPM:
 733                         force_mode = 1;
 734                         break;
 735                 case QCOM_RPM_FORCE_MODE_HPM:
 736                         if (FORCE_MODE_IS_2_BITS(vreg))
 737                                 force_mode = 2;
 738                         else
 739                                 force_mode = 3;
 740                         break;
 741                 case QCOM_RPM_FORCE_MODE_AUTO:
 742                         if (vreg->supports_force_mode_auto)
 743                                 force_mode = 2;
 744                         break;
 745                 case QCOM_RPM_FORCE_MODE_BYPASS:
 746                         if (vreg->supports_force_mode_bypass)
 747                                 force_mode = 4;
 748                         break;
 749                 }
 750
 751                 if (force_mode < 0) {
 752                         dev_err(&pdev->dev, "invalid force mode\n");
 753                         return -EINVAL;
 754                 }
 755
 756                 ret = rpm_reg_set(vreg, &vreg->parts->fm, force_mode);
 757                 if (ret) {
 758                         dev_err(&pdev->dev, "failed to set force mode\n");
 759                         return ret;
 760                 }
 761         }
 762
 763         config.dev = &pdev->dev;
 764         config.init_data = initdata;
 765         config.driver_data = vreg;
 766         config.of_node = pdev->dev.of_node;
 767         rdev = devm_regulator_register(&pdev->dev, &vreg->desc, &config);
 768         if (IS_ERR(rdev)) {
 769                 dev_err(&pdev->dev, "can't register regulator\n");
 770                 return PTR_ERR(rdev);
 771         }
 772
 773         return 0;
 774 }
 775
 776 static struct platform_driver rpm_reg_driver = {
 777         .probe          = rpm_reg_probe,
 778         .driver  = {
 779                 .name  = "qcom_rpm_reg",
 780                 .owner = THIS_MODULE,
 781                 .of_match_table = of_match_ptr(rpm_of_match),
 782         },
 783 };
 784
 785 static int __init rpm_reg_init(void)
 786 {
 787         return platform_driver_register(&rpm_reg_driver);
 788 }
 789 subsys_initcall(rpm_reg_init);
 790
 791 static void __exit rpm_reg_exit(void)
 792 {
 793         platform_driver_unregister(&rpm_reg_driver);
 794 }
 795 module_exit(rpm_reg_exit)
 796
 797 MODULE_DESCRIPTION("Qualcomm RPM regulator driver");
 798 MODULE_LICENSE("GPL v2");