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   1 /*
   2  * Regulators driver for Marvell 88PM8607
   3  *
   4  * Copyright (C) 2009 Marvell International Ltd.
   5  *      Haojian Zhuang <haojian.zhuang@marvell.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License version 2 as
   9  * published by the Free Software Foundation.
  10  */
  11 #include <linux/kernel.h>
  12 #include <linux/init.h>
  13 #include <linux/err.h>
  14 #include <linux/i2c.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/regulator/driver.h>
  17 #include <linux/regulator/machine.h>
  18 #include <linux/mfd/88pm860x.h>
  19
  20 struct pm8607_regulator_info {
  21         struct regulator_desc   desc;
  22         struct pm860x_chip      *chip;
  23         struct regulator_dev    *regulator;
  24         struct i2c_client       *i2c;
  25
  26         int     min_uV;
  27         int     max_uV;
  28         int     step_uV;
  29         int     vol_reg;
  30         int     vol_shift;
  31         int     vol_nbits;
  32         int     update_reg;
  33         int     update_bit;
  34         int     enable_reg;
  35         int     enable_bit;
  36         int     slope_double;
  37 };
  38
  39 static inline int check_range(struct pm8607_regulator_info *info,
  40                                 int min_uV, int max_uV)
  41 {
  42         if (max_uV < info->min_uV || min_uV > info->max_uV || min_uV > max_uV)
  43                 return -EINVAL;
  44
  45         return 0;
  46 }
  47
  48 static int pm8607_list_voltage(struct regulator_dev *rdev, unsigned index)
  49 {
  50         struct pm8607_regulator_info *info = rdev_get_drvdata(rdev);
  51         int ret = -EINVAL;
  52
  53         switch (info->desc.id) {
  54         case PM8607_ID_BUCK1:
  55                 ret = (index < 0x1d) ? (index * 25000 + 800000) :
  56                         ((index < 0x20) ? 1500000 :
  57                         ((index < 0x40) ? ((index - 0x20) * 25000) :
  58                         -EINVAL));
  59                 break;
  60         case PM8607_ID_BUCK3:
  61                 ret = (index < 0x3d) ? (index * 25000) :
  62                         ((index < 0x40) ? 1500000 : -EINVAL);
  63                 if (ret < 0)
  64                         break;
  65                 if (info->slope_double)
  66                         ret <<= 1;
  67                 break;
  68         case PM8607_ID_LDO1:
  69                 ret = (index == 0) ? 1800000 :
  70                         ((index == 1) ? 1200000 :
  71                         ((index == 2) ? 2800000 : -EINVAL));
  72                 break;
  73         case PM8607_ID_LDO5:
  74                 ret = (index == 0) ? 2900000 :
  75                         ((index == 1) ? 3000000 :
  76                         ((index == 2) ? 3100000 : 3300000));
  77                 break;
  78         case PM8607_ID_LDO7:
  79         case PM8607_ID_LDO8:
  80                 ret = (index < 3) ? (index * 50000 + 1800000) :
  81                         ((index < 8) ? (index * 50000 + 2550000) :
  82                          -EINVAL);
  83                 break;
  84         case PM8607_ID_LDO12:
  85                 ret = (index < 2) ? (index * 100000 + 1800000) :
  86                         ((index < 7) ? (index * 100000 + 2500000) :
  87                         ((index == 7) ? 3300000 : 1200000));
  88                 break;
  89         case PM8607_ID_LDO2:
  90         case PM8607_ID_LDO3:
  91         case PM8607_ID_LDO9:
  92                 ret = (index < 3) ? (index * 50000 + 1800000) :
  93                         ((index < 7) ? (index * 50000 + 2550000) :
  94                         3300000);
  95                 break;
  96         case PM8607_ID_LDO4:
  97                 ret = (index < 3) ? (index * 50000 + 1800000) :
  98                         ((index < 6) ? (index * 50000 + 2550000) :
  99                         ((index == 6) ? 2900000 : 3300000));
 100                 break;
 101         case PM8607_ID_LDO6:
 102                 ret = (index < 2) ? (index * 50000 + 1800000) :
 103                         ((index < 7) ? (index * 50000 + 2500000) :
 104                         3300000);
 105                 break;
 106         case PM8607_ID_LDO10:
 107                 ret = (index < 3) ? (index * 50000 + 1800000) :
 108                         ((index < 7) ? (index * 50000 + 2550000) :
 109                         ((index == 7) ? 3300000 : 1200000));
 110                 break;
 111         case PM8607_ID_LDO14:
 112                 ret = (index < 2) ? (index * 50000 + 1800000) :
 113                         ((index < 7) ? (index * 50000 + 2600000) :
 114                         3300000);
 115                 break;
 116         }
 117         return ret;
 118 }
 119
 120 static int choose_voltage(struct regulator_dev *rdev, int min_uV, int max_uV)
 121 {
 122         struct pm8607_regulator_info *info = rdev_get_drvdata(rdev);
 123         int val = -ENOENT;
 124         int ret;
 125
 126         switch (info->desc.id) {
 127         case PM8607_ID_BUCK1:
 128                 if (min_uV >= 800000)           /* 800mV ~ 1500mV / 25mV */
 129                         val = (min_uV - 775001) / 25000;
 130                 else {                          /* 25mV ~ 775mV / 25mV */
 131                         val = (min_uV + 249999) / 25000;
 132                         val += 32;
 133                 }
 134                 break;
 135         case PM8607_ID_BUCK3:
 136                 if (info->slope_double)
 137                         min_uV = min_uV >> 1;
 138                 val = (min_uV + 249999) / 25000; /* 0mV ~ 1500mV / 25mV */
 139
 140                 break;
 141         case PM8607_ID_LDO1:
 142                 if (min_uV > 1800000)
 143                         val = 2;
 144                 else if (min_uV > 1200000)
 145                         val = 0;
 146                 else
 147                         val = 1;
 148                 break;
 149         case PM8607_ID_LDO5:
 150                 if (min_uV > 3100000)
 151                         val = 3;
 152                 else                            /* 2900mV ~ 3100mV / 100mV */
 153                         val = (min_uV - 2800001) / 100000;
 154                 break;
 155         case PM8607_ID_LDO7:
 156         case PM8607_ID_LDO8:
 157                 if (min_uV < 2700000) { /* 1800mV ~ 1900mV / 50mV */
 158                         if (min_uV <= 1800000)
 159                                 val = 0;        /* 1800mv */
 160                         else if (min_uV <= 1900000)
 161                                 val = (min_uV - 1750001) / 50000;
 162                         else
 163                                 val = 3;        /* 2700mV */
 164                 } else {                 /* 2700mV ~ 2900mV / 50mV */
 165                         if (min_uV <= 2900000) {
 166                                 val = (min_uV - 2650001) / 50000;
 167                                 val += 3;
 168                         } else
 169                                 val = -EINVAL;
 170                 }
 171                 break;
 172         case PM8607_ID_LDO10:
 173                 if (min_uV > 2850000)
 174                         val = 7;
 175                 else if (min_uV <= 1200000)
 176                         val = 8;
 177                 else if (min_uV < 2700000)      /* 1800mV ~ 1900mV / 50mV */
 178                         val = (min_uV - 1750001) / 50000;
 179                 else {                          /* 2700mV ~ 2850mV / 50mV */
 180                         val = (min_uV - 2650001) / 50000;
 181                         val += 3;
 182                 }
 183                 break;
 184         case PM8607_ID_LDO12:
 185                 if (min_uV < 2700000) {         /* 1800mV ~ 1900mV / 100mV */
 186                         if (min_uV <= 1200000)
 187                                 val = 8;        /* 1200mV */
 188                         else if (min_uV <= 1800000)
 189                                 val = 0;        /* 1800mV */
 190                         else if (min_uV <= 1900000)
 191                                 val = (min_uV - 1700001) / 100000;
 192                         else
 193                                 val = 2;        /* 2700mV */
 194                 } else {                        /* 2700mV ~ 3100mV / 100mV */
 195                         if (min_uV <= 3100000) {
 196                                 val = (min_uV - 2600001) / 100000;
 197                                 val += 2;
 198                         } else if (min_uV <= 3300000)
 199                                 val = 7;
 200                         else
 201                                 val = -EINVAL;
 202                 }
 203                 break;
 204         case PM8607_ID_LDO2:
 205         case PM8607_ID_LDO3:
 206         case PM8607_ID_LDO9:
 207                 if (min_uV < 2700000) { /* 1800mV ~ 1900mV / 50mV */
 208                         if (min_uV <= 1800000)
 209                                 val = 0;
 210                         else if (min_uV <= 1900000)
 211                                 val = (min_uV - 1750001) / 50000;
 212                         else
 213                                 val = 3;        /* 2700mV */
 214                 } else {                 /* 2700mV ~ 2850mV / 50mV */
 215                         if (min_uV <= 2850000) {
 216                                 val = (min_uV - 2650001) / 50000;
 217                                 val += 3;
 218                         } else if (min_uV <= 3300000)
 219                                 val = 7;
 220                         else
 221                                 val = -EINVAL;
 222                 }
 223                 break;
 224         case PM8607_ID_LDO4:
 225                 if (min_uV < 2700000) { /* 1800mV ~ 1900mV / 50mV */
 226                         if (min_uV <= 1800000)
 227                                 val = 0;
 228                         else if (min_uV <= 1900000)
 229                                 val = (min_uV - 1750001) / 50000;
 230                         else
 231                                 val = 3;        /* 2700mV */
 232                 } else {                 /* 2700mV ~ 2800mV / 50mV */
 233                         if (min_uV <= 2850000) {
 234                                 val = (min_uV - 2650001) / 50000;
 235                                 val += 3;
 236                         } else if (min_uV <= 2900000)
 237                                 val = 6;
 238                         else if (min_uV <= 3300000)
 239                                 val = 7;
 240                         else
 241                                 val = -EINVAL;
 242                 }
 243                 break;
 244         case PM8607_ID_LDO6:
 245                 if (min_uV < 2600000) { /* 1800mV ~ 1850mV / 50mV */
 246                         if (min_uV <= 1800000)
 247                                 val = 0;
 248                         else if (min_uV <= 1850000)
 249                                 val = (min_uV - 1750001) / 50000;
 250                         else
 251                                 val = 2;        /* 2600mV */
 252                 } else {                /* 2600mV ~ 2800mV / 50mV */
 253                         if (min_uV <= 2800000) {
 254                                 val = (min_uV - 2550001) / 50000;
 255                                 val += 2;
 256                         } else if (min_uV <= 3300000)
 257                                 val = 7;
 258                         else
 259                                 val = -EINVAL;
 260                 }
 261                 break;
 262         case PM8607_ID_LDO14:
 263                 if (min_uV < 2700000) { /* 1800mV ~ 1850mV / 50mV */
 264                         if (min_uV <= 1800000)
 265                                 val = 0;
 266                         else if (min_uV <= 1850000)
 267                                 val = (min_uV - 1750001) / 50000;
 268                         else
 269                                 val = 2;        /* 2700mV */
 270                 } else {                 /* 2700mV ~ 2900mV / 50mV */
 271                         if (min_uV <= 2900000) {
 272                                 val = (min_uV - 2650001) / 50000;
 273                                 val += 2;
 274                         } else if (min_uV <= 3300000)
 275                                 val = 7;
 276                         else
 277                                 val = -EINVAL;
 278                 }
 279                 break;
 280         }
 281         if (val >= 0) {
 282                 ret = pm8607_list_voltage(rdev, val);
 283                 if (ret > max_uV) {
 284                         pr_err("exceed voltage range (%d %d) uV",
 285                                 min_uV, max_uV);
 286                         return -EINVAL;
 287                 }
 288         } else
 289                 pr_err("invalid voltage range (%d %d) uV", min_uV, max_uV);
 290         return val;
 291 }
 292
 293 static int pm8607_set_voltage(struct regulator_dev *rdev,
 294                               int min_uV, int max_uV)
 295 {
 296         struct pm8607_regulator_info *info = rdev_get_drvdata(rdev);
 297         uint8_t val, mask;
 298         int ret;
 299
 300         if (check_range(info, min_uV, max_uV)) {
 301                 pr_err("invalid voltage range (%d, %d) uV\n", min_uV, max_uV);
 302                 return -EINVAL;
 303         }
 304
 305         ret = choose_voltage(rdev, min_uV, max_uV);
 306         if (ret < 0)
 307                 return -EINVAL;
 308         val = (uint8_t)(ret << info->vol_shift);
 309         mask = ((1 << info->vol_nbits) - 1)  << info->vol_shift;
 310
 311         ret = pm860x_set_bits(info->i2c, info->vol_reg, mask, val);
 312         if (ret)
 313                 return ret;
 314         switch (info->desc.id) {
 315         case PM8607_ID_BUCK1:
 316         case PM8607_ID_BUCK3:
 317                 ret = pm860x_set_bits(info->i2c, info->update_reg,
 318                                       1 << info->update_bit,
 319                                       1 << info->update_bit);
 320                 break;
 321         }
 322         return ret;
 323 }
 324
 325 static int pm8607_get_voltage(struct regulator_dev *rdev)
 326 {
 327         struct pm8607_regulator_info *info = rdev_get_drvdata(rdev);
 328         uint8_t val, mask;
 329         int ret;
 330
 331         ret = pm860x_reg_read(info->i2c, info->vol_reg);
 332         if (ret < 0)
 333                 return ret;
 334
 335         mask = ((1 << info->vol_nbits) - 1)  << info->vol_shift;
 336         val = ((unsigned char)ret & mask) >> info->vol_shift;
 337
 338         return pm8607_list_voltage(rdev, val);
 339 }
 340
 341 static int pm8607_enable(struct regulator_dev *rdev)
 342 {
 343         struct pm8607_regulator_info *info = rdev_get_drvdata(rdev);
 344
 345         return pm860x_set_bits(info->i2c, info->enable_reg,
 346                                1 << info->enable_bit,
 347                                1 << info->enable_bit);
 348 }
 349
 350 static int pm8607_disable(struct regulator_dev *rdev)
 351 {
 352         struct pm8607_regulator_info *info = rdev_get_drvdata(rdev);
 353
 354         return pm860x_set_bits(info->i2c, info->enable_reg,
 355                                1 << info->enable_bit, 0);
 356 }
 357
 358 static int pm8607_is_enabled(struct regulator_dev *rdev)
 359 {
 360         struct pm8607_regulator_info *info = rdev_get_drvdata(rdev);
 361         int ret;
 362
 363         ret = pm860x_reg_read(info->i2c, info->enable_reg);
 364         if (ret < 0)
 365                 return ret;
 366
 367         return !!((unsigned char)ret & (1 << info->enable_bit));
 368 }
 369
 370 static struct regulator_ops pm8607_regulator_ops = {
 371         .set_voltage    = pm8607_set_voltage,
 372         .get_voltage    = pm8607_get_voltage,
 373         .enable         = pm8607_enable,
 374         .disable        = pm8607_disable,
 375         .is_enabled     = pm8607_is_enabled,
 376 };
 377
 378 #define PM8607_DVC(_id, min, max, step, vreg, nbits, ureg, ubit, ereg, ebit) \
 379 {                                                                       \
 380         .desc   = {                                                     \
 381                 .name   = "BUCK" #_id,                                  \
 382                 .ops    = &pm8607_regulator_ops,                        \
 383                 .type   = REGULATOR_VOLTAGE,                            \
 384                 .id     = PM8607_ID_BUCK##_id,                          \
 385                 .owner  = THIS_MODULE,                                  \
 386         },                                                              \
 387         .min_uV         = (min) * 1000,                                 \
 388         .max_uV         = (max) * 1000,                                 \
 389         .step_uV        = (step) * 1000,                                \
 390         .vol_reg        = PM8607_##vreg,                                \
 391         .vol_shift      = (0),                                          \
 392         .vol_nbits      = (nbits),                                      \
 393         .update_reg     = PM8607_##ureg,                                \
 394         .update_bit     = (ubit),                                       \
 395         .enable_reg     = PM8607_##ereg,                                \
 396         .enable_bit     = (ebit),                                       \
 397         .slope_double   = (0),                                          \
 398 }
 399
 400 #define PM8607_LDO(_id, min, max, step, vreg, shift, nbits, ereg, ebit) \
 401 {                                                                       \
 402         .desc   = {                                                     \
 403                 .name   = "LDO" #_id,                                   \
 404                 .ops    = &pm8607_regulator_ops,                        \
 405                 .type   = REGULATOR_VOLTAGE,                            \
 406                 .id     = PM8607_ID_LDO##_id,                           \
 407                 .owner  = THIS_MODULE,                                  \
 408         },                                                              \
 409         .min_uV         = (min) * 1000,                                 \
 410         .max_uV         = (max) * 1000,                                 \
 411         .step_uV        = (step) * 1000,                                \
 412         .vol_reg        = PM8607_##vreg,                                \
 413         .vol_shift      = (shift),                                      \
 414         .vol_nbits      = (nbits),                                      \
 415         .enable_reg     = PM8607_##ereg,                                \
 416         .enable_bit     = (ebit),                                       \
 417         .slope_double   = (0),                                          \
 418 }
 419
 420 static struct pm8607_regulator_info pm8607_regulator_info[] = {
 421         PM8607_DVC(1, 0, 1500, 25, BUCK1, 6, GO, 0, SUPPLIES_EN11, 0),
 422         PM8607_DVC(3, 0, 1500, 25, BUCK3, 6, GO, 2, SUPPLIES_EN11, 2),
 423
 424         PM8607_LDO(1 , 1200, 2800, 0, LDO1 , 0, 2, SUPPLIES_EN11, 3),
 425         PM8607_LDO(2 , 1800, 3300, 0, LDO2 , 0, 3, SUPPLIES_EN11, 4),
 426         PM8607_LDO(3 , 1800, 3300, 0, LDO3 , 0, 3, SUPPLIES_EN11, 5),
 427         PM8607_LDO(4 , 1800, 3300, 0, LDO4 , 0, 3, SUPPLIES_EN11, 6),
 428         PM8607_LDO(5 , 2900, 3300, 0, LDO5 , 0, 2, SUPPLIES_EN11, 7),
 429         PM8607_LDO(6 , 1800, 3300, 0, LDO6 , 0, 3, SUPPLIES_EN12, 0),
 430         PM8607_LDO(7 , 1800, 2900, 0, LDO7 , 0, 3, SUPPLIES_EN12, 1),
 431         PM8607_LDO(8 , 1800, 2900, 0, LDO8 , 0, 3, SUPPLIES_EN12, 2),
 432         PM8607_LDO(9 , 1800, 3300, 0, LDO9 , 0, 3, SUPPLIES_EN12, 3),
 433         PM8607_LDO(10, 1200, 3300, 0, LDO10, 0, 4, SUPPLIES_EN11, 4),
 434         PM8607_LDO(12, 1200, 3300, 0, LDO12, 0, 4, SUPPLIES_EN11, 5),
 435         PM8607_LDO(14, 1800, 3300, 0, LDO14, 0, 3, SUPPLIES_EN11, 6),
 436 };
 437
 438 static inline struct pm8607_regulator_info *find_regulator_info(int id)
 439 {
 440         struct pm8607_regulator_info *info;
 441         int i;
 442
 443         for (i = 0; i < ARRAY_SIZE(pm8607_regulator_info); i++) {
 444                 info = &pm8607_regulator_info[i];
 445                 if (info->desc.id == id)
 446                         return info;
 447         }
 448         return NULL;
 449 }
 450
 451 static int __devinit pm8607_regulator_probe(struct platform_device *pdev)
 452 {
 453         struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
 454         struct pm860x_platform_data *pdata = chip->dev->platform_data;
 455         struct pm8607_regulator_info *info = NULL;
 456
 457         info = find_regulator_info(pdev->id);
 458         if (info == NULL) {
 459                 dev_err(&pdev->dev, "invalid regulator ID specified\n");
 460                 return -EINVAL;
 461         }
 462
 463         info->i2c = (chip->id == CHIP_PM8607) ? chip->client : chip->companion;
 464         info->chip = chip;
 465
 466         info->regulator = regulator_register(&info->desc, &pdev->dev,
 467                                              pdata->regulator[pdev->id], info);
 468         if (IS_ERR(info->regulator)) {
 469                 dev_err(&pdev->dev, "failed to register regulator %s\n",
 470                         info->desc.name);
 471                 return PTR_ERR(info->regulator);
 472         }
 473
 474         /* check DVC ramp slope double */
 475         if (info->desc.id == PM8607_ID_BUCK3)
 476                 if (info->chip->buck3_double)
 477                         info->slope_double = 1;
 478
 479         platform_set_drvdata(pdev, info);
 480         return 0;
 481 }
 482
 483 static int __devexit pm8607_regulator_remove(struct platform_device *pdev)
 484 {
 485         struct pm8607_regulator_info *info = platform_get_drvdata(pdev);
 486
 487         regulator_unregister(info->regulator);
 488         return 0;
 489 }
 490
 491 #define PM8607_REGULATOR_DRIVER(_name)                          \
 492 {                                                               \
 493         .driver         = {                                     \
 494                 .name   = "88pm8607-" #_name,                   \
 495                 .owner  = THIS_MODULE,                          \
 496         },                                                      \
 497         .probe          = pm8607_regulator_probe,               \
 498         .remove         = __devexit_p(pm8607_regulator_remove), \
 499 }
 500
 501 static struct platform_driver pm8607_regulator_driver[] = {
 502         PM8607_REGULATOR_DRIVER(buck1),
 503         PM8607_REGULATOR_DRIVER(buck2),
 504         PM8607_REGULATOR_DRIVER(buck3),
 505         PM8607_REGULATOR_DRIVER(ldo1),
 506         PM8607_REGULATOR_DRIVER(ldo2),
 507         PM8607_REGULATOR_DRIVER(ldo3),
 508         PM8607_REGULATOR_DRIVER(ldo4),
 509         PM8607_REGULATOR_DRIVER(ldo5),
 510         PM8607_REGULATOR_DRIVER(ldo6),
 511         PM8607_REGULATOR_DRIVER(ldo7),
 512         PM8607_REGULATOR_DRIVER(ldo8),
 513         PM8607_REGULATOR_DRIVER(ldo9),
 514         PM8607_REGULATOR_DRIVER(ldo10),
 515         PM8607_REGULATOR_DRIVER(ldo12),
 516         PM8607_REGULATOR_DRIVER(ldo14),
 517 };
 518
 519 static int __init pm8607_regulator_init(void)
 520 {
 521         int i, count, ret;
 522
 523         count = ARRAY_SIZE(pm8607_regulator_driver);
 524         for (i = 0; i < count; i++) {
 525                 ret = platform_driver_register(&pm8607_regulator_driver[i]);
 526                 if (ret != 0)
 527                         pr_err("Failed to register regulator driver: %d\n",
 528                                 ret);
 529         }
 530         return 0;
 531 }
 532 subsys_initcall(pm8607_regulator_init);
 533
 534 static void __exit pm8607_regulator_exit(void)
 535 {
 536         int i, count;
 537
 538         count = ARRAY_SIZE(pm8607_regulator_driver);
 539         for (i = 0; i < count; i++)
 540                 platform_driver_unregister(&pm8607_regulator_driver[i]);
 541 }
 542 module_exit(pm8607_regulator_exit);
 543
 544 MODULE_LICENSE("GPL");
 545 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
 546 MODULE_DESCRIPTION("Regulator Driver for Marvell 88PM8607 PMIC");
 547 MODULE_ALIAS("platform:88pm8607-regulator");