drivers/regulator/tps6586x-regulator.c

   1 /*
   2  * Regulator driver for TI TPS6586x
   3  *
   4  * Copyright (C) 2010 Compulab Ltd.
   5  * Author: Mike Rapoport <mike@compulab.co.il>
   6  *
   7  * Based on da903x
   8  * Copyright (C) 2006-2008 Marvell International Ltd.
   9  * Copyright (C) 2008 Compulab Ltd.
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/init.h>
  18 #include <linux/err.h>
  19 #include <linux/slab.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/regulator/driver.h>
  22 #include <linux/regulator/machine.h>
  23 #include <linux/mfd/tps6586x.h>
  24
  25 /* supply control and voltage setting  */
  26 #define TPS6586X_SUPPLYENA      0x10
  27 #define TPS6586X_SUPPLYENB      0x11
  28 #define TPS6586X_SUPPLYENC      0x12
  29 #define TPS6586X_SUPPLYEND      0x13
  30 #define TPS6586X_SUPPLYENE      0x14
  31 #define TPS6586X_VCC1           0x20
  32 #define TPS6586X_VCC2           0x21
  33 #define TPS6586X_SM1V1          0x23
  34 #define TPS6586X_SM1V2          0x24
  35 #define TPS6586X_SM1SL          0x25
  36 #define TPS6586X_SM0V1          0x26
  37 #define TPS6586X_SM0V2          0x27
  38 #define TPS6586X_SM0SL          0x28
  39 #define TPS6586X_LDO2AV1        0x29
  40 #define TPS6586X_LDO2AV2        0x2A
  41 #define TPS6586X_LDO2BV1        0x2F
  42 #define TPS6586X_LDO2BV2        0x30
  43 #define TPS6586X_LDO4V1         0x32
  44 #define TPS6586X_LDO4V2         0x33
  45
  46 /* converter settings  */
  47 #define TPS6586X_SUPPLYV1       0x41
  48 #define TPS6586X_SUPPLYV2       0x42
  49 #define TPS6586X_SUPPLYV3       0x43
  50 #define TPS6586X_SUPPLYV4       0x44
  51 #define TPS6586X_SUPPLYV5       0x45
  52 #define TPS6586X_SUPPLYV6       0x46
  53 #define TPS6586X_SMODE1         0x47
  54 #define TPS6586X_SMODE2         0x48
  55
  56 struct tps6586x_regulator {
  57         struct regulator_desc desc;
  58
  59         int volt_reg;
  60         int volt_shift;
  61         int volt_nbits;
  62         int enable_bit[2];
  63         int enable_reg[2];
  64
  65         int *voltages;
  66
  67         /* for DVM regulators */
  68         int go_reg;
  69         int go_bit;
  70 };
  71
  72 static inline struct device *to_tps6586x_dev(struct regulator_dev *rdev)
  73 {
  74         return rdev_get_dev(rdev)->parent->parent;
  75 }
  76
  77 static int tps6586x_ldo_list_voltage(struct regulator_dev *rdev,
  78                                      unsigned selector)
  79 {
  80         struct tps6586x_regulator *info = rdev_get_drvdata(rdev);
  81
  82         return info->voltages[selector] * 1000;
  83 }
  84
  85
  86 static int __tps6586x_ldo_set_voltage(struct device *parent,
  87                                       struct tps6586x_regulator *ri,
  88                                       int min_uV, int max_uV)
  89 {
  90         int val, uV;
  91         uint8_t mask;
  92
  93         for (val = 0; val < ri->desc.n_voltages; val++) {
  94                 uV = ri->voltages[val] * 1000;
  95
  96                 /* LDO0 has minimal voltage 1.2 rather than 1.25 */
  97                 if (ri->desc.id == TPS6586X_ID_LDO_0 && val == 0)
  98                         uV -= 50 * 1000;
  99
 100                 /* use the first in-range value */
 101                 if (min_uV <= uV && uV <= max_uV) {
 102
 103                         val <<= ri->volt_shift;
 104                         mask = ((1 << ri->volt_nbits) - 1) << ri->volt_shift;
 105
 106                         return tps6586x_update(parent, ri->volt_reg, val, mask);
 107                 }
 108         }
 109
 110         return -EINVAL;
 111 }
 112
 113 static int tps6586x_ldo_set_voltage(struct regulator_dev *rdev,
 114                                     int min_uV, int max_uV)
 115 {
 116         struct tps6586x_regulator *ri = rdev_get_drvdata(rdev);
 117         struct device *parent = to_tps6586x_dev(rdev);
 118
 119         return __tps6586x_ldo_set_voltage(parent, ri, min_uV, max_uV);
 120 }
 121
 122 static int tps6586x_ldo_get_voltage(struct regulator_dev *rdev)
 123 {
 124         struct tps6586x_regulator *ri = rdev_get_drvdata(rdev);
 125         struct device *parent = to_tps6586x_dev(rdev);
 126         uint8_t val, mask;
 127         int ret;
 128
 129         ret = tps6586x_read(parent, ri->volt_reg, &val);
 130         if (ret)
 131                 return ret;
 132
 133         mask = ((1 << ri->volt_nbits) - 1) << ri->volt_shift;
 134         val = (val & mask) >> ri->volt_shift;
 135
 136         if (val >= ri->desc.n_voltages)
 137                 BUG();
 138
 139         return ri->voltages[val] * 1000;
 140 }
 141
 142 static int tps6586x_dvm_set_voltage(struct regulator_dev *rdev,
 143                                     int min_uV, int max_uV)
 144 {
 145         struct tps6586x_regulator *ri = rdev_get_drvdata(rdev);
 146         struct device *parent = to_tps6586x_dev(rdev);
 147         int ret;
 148
 149         ret = __tps6586x_ldo_set_voltage(parent, ri, min_uV, max_uV);
 150         if (ret)
 151                 return ret;
 152
 153         return tps6586x_set_bits(parent, ri->go_reg, 1 << ri->go_bit);
 154 }
 155
 156 static int tps6586x_regulator_enable(struct regulator_dev *rdev)
 157 {
 158         struct tps6586x_regulator *ri = rdev_get_drvdata(rdev);
 159         struct device *parent = to_tps6586x_dev(rdev);
 160
 161         return tps6586x_set_bits(parent, ri->enable_reg[0],
 162                                  1 << ri->enable_bit[0]);
 163 }
 164
 165 static int tps6586x_regulator_disable(struct regulator_dev *rdev)
 166 {
 167         struct tps6586x_regulator *ri = rdev_get_drvdata(rdev);
 168         struct device *parent = to_tps6586x_dev(rdev);
 169
 170         return tps6586x_clr_bits(parent, ri->enable_reg[0],
 171                                  1 << ri->enable_bit[0]);
 172 }
 173
 174 static int tps6586x_regulator_is_enabled(struct regulator_dev *rdev)
 175 {
 176         struct tps6586x_regulator *ri = rdev_get_drvdata(rdev);
 177         struct device *parent = to_tps6586x_dev(rdev);
 178         uint8_t reg_val;
 179         int ret;
 180
 181         ret = tps6586x_read(parent, ri->enable_reg[0], &reg_val);
 182         if (ret)
 183                 return ret;
 184
 185         return !!(reg_val & (1 << ri->enable_bit[0]));
 186 }
 187
 188 static struct regulator_ops tps6586x_regulator_ldo_ops = {
 189         .list_voltage = tps6586x_ldo_list_voltage,
 190         .get_voltage = tps6586x_ldo_get_voltage,
 191         .set_voltage = tps6586x_ldo_set_voltage,
 192
 193         .is_enabled = tps6586x_regulator_is_enabled,
 194         .enable = tps6586x_regulator_enable,
 195         .disable = tps6586x_regulator_disable,
 196 };
 197
 198 static struct regulator_ops tps6586x_regulator_dvm_ops = {
 199         .list_voltage = tps6586x_ldo_list_voltage,
 200         .get_voltage = tps6586x_ldo_get_voltage,
 201         .set_voltage = tps6586x_dvm_set_voltage,
 202
 203         .is_enabled = tps6586x_regulator_is_enabled,
 204         .enable = tps6586x_regulator_enable,
 205         .disable = tps6586x_regulator_disable,
 206 };
 207
 208 static int tps6586x_ldo_voltages[] = {
 209         1250, 1500, 1800, 2500, 2700, 2850, 3100, 3300,
 210 };
 211
 212 static int tps6586x_ldo4_voltages[] = {
 213         1700, 1725, 1750, 1775, 1800, 1825, 1850, 1875,
 214         1900, 1925, 1950, 1975, 2000, 2025, 2050, 2075,
 215         2100, 2125, 2150, 2175, 2200, 2225, 2250, 2275,
 216         2300, 2325, 2350, 2375, 2400, 2425, 2450, 2475,
 217 };
 218
 219 static int tps6586x_sm2_voltages[] = {
 220         3000, 3050, 3100, 3150, 3200, 3250, 3300, 3350,
 221         3400, 3450, 3500, 3550, 3600, 3650, 3700, 3750,
 222         3800, 3850, 3900, 3950, 4000, 4050, 4100, 4150,
 223         4200, 4250, 4300, 4350, 4400, 4450, 4500, 4550,
 224 };
 225
 226 static int tps6586x_dvm_voltages[] = {
 227          725,  750,  775,  800,  825,  850,  875,  900,
 228          925,  950,  975, 1000, 1025, 1050, 1075, 1100,
 229         1125, 1150, 1175, 1200, 1225, 1250, 1275, 1300,
 230         1325, 1350, 1375, 1400, 1425, 1450, 1475, 1500,
 231 };
 232
 233 #define TPS6586X_REGULATOR(_id, vdata, _ops, vreg, shift, nbits,        \
 234                            ereg0, ebit0, ereg1, ebit1)                  \
 235         .desc   = {                                                     \
 236                 .name   = "REG-" #_id,                                  \
 237                 .ops    = &tps6586x_regulator_##_ops,                   \
 238                 .type   = REGULATOR_VOLTAGE,                            \
 239                 .id     = TPS6586X_ID_##_id,                            \
 240                 .n_voltages = ARRAY_SIZE(tps6586x_##vdata##_voltages),  \
 241                 .owner  = THIS_MODULE,                                  \
 242         },                                                              \
 243         .volt_reg       = TPS6586X_##vreg,                              \
 244         .volt_shift     = (shift),                                      \
 245         .volt_nbits     = (nbits),                                      \
 246         .enable_reg[0]  = TPS6586X_SUPPLY##ereg0,                       \
 247         .enable_bit[0]  = (ebit0),                                      \
 248         .enable_reg[1]  = TPS6586X_SUPPLY##ereg1,                       \
 249         .enable_bit[1]  = (ebit1),                                      \
 250         .voltages       = tps6586x_##vdata##_voltages,
 251
 252 #define TPS6586X_REGULATOR_DVM_GOREG(goreg, gobit)                      \
 253         .go_reg = TPS6586X_##goreg,                                     \
 254         .go_bit = (gobit),
 255
 256 #define TPS6586X_LDO(_id, vdata, vreg, shift, nbits,                    \
 257                      ereg0, ebit0, ereg1, ebit1)                        \
 258 {                                                                       \
 259         TPS6586X_REGULATOR(_id, vdata, ldo_ops, vreg, shift, nbits,     \
 260                            ereg0, ebit0, ereg1, ebit1)                  \
 261 }
 262
 263 #define TPS6586X_DVM(_id, vdata, vreg, shift, nbits,                    \
 264                      ereg0, ebit0, ereg1, ebit1, goreg, gobit)          \
 265 {                                                                       \
 266         TPS6586X_REGULATOR(_id, vdata, dvm_ops, vreg, shift, nbits,     \
 267                            ereg0, ebit0, ereg1, ebit1)                  \
 268         TPS6586X_REGULATOR_DVM_GOREG(goreg, gobit)                      \
 269 }
 270
 271 static struct tps6586x_regulator tps6586x_regulator[] = {
 272         TPS6586X_LDO(LDO_0, ldo, SUPPLYV1, 5, 3, ENC, 0, END, 0),
 273         TPS6586X_LDO(LDO_3, ldo, SUPPLYV4, 0, 3, ENC, 2, END, 2),
 274         TPS6586X_LDO(LDO_5, ldo, SUPPLYV6, 0, 3, ENE, 6, ENE, 6),
 275         TPS6586X_LDO(LDO_6, ldo, SUPPLYV3, 0, 3, ENC, 4, END, 4),
 276         TPS6586X_LDO(LDO_7, ldo, SUPPLYV3, 3, 3, ENC, 5, END, 5),
 277         TPS6586X_LDO(LDO_8, ldo, SUPPLYV2, 5, 3, ENC, 6, END, 6),
 278         TPS6586X_LDO(LDO_9, ldo, SUPPLYV6, 3, 3, ENE, 7, ENE, 7),
 279         TPS6586X_LDO(LDO_RTC, ldo, SUPPLYV4, 3, 3, V4, 7, V4, 7),
 280         TPS6586X_LDO(LDO_1, dvm, SUPPLYV1, 0, 5, ENC, 1, END, 1),
 281         TPS6586X_LDO(SM_2, sm2, SUPPLYV2, 0, 5, ENC, 7, END, 7),
 282
 283         TPS6586X_DVM(LDO_2, dvm, LDO2BV1, 0, 5, ENA, 3, ENB, 3, VCC2, 6),
 284         TPS6586X_DVM(LDO_4, ldo4, LDO4V1, 0, 5, ENC, 3, END, 3, VCC1, 6),
 285         TPS6586X_DVM(SM_0, dvm, SM0V1, 0, 5, ENA, 1, ENB, 1, VCC1, 2),
 286         TPS6586X_DVM(SM_1, dvm, SM1V1, 0, 5, ENA, 0, ENB, 0, VCC1, 0),
 287 };
 288
 289 /*
 290  * TPS6586X has 2 enable bits that are OR'ed to determine the actual
 291  * regulator state. Clearing one of this bits allows switching
 292  * regulator on and of with single register write.
 293  */
 294 static inline int tps6586x_regulator_preinit(struct device *parent,
 295                                              struct tps6586x_regulator *ri)
 296 {
 297         uint8_t val1, val2;
 298         int ret;
 299
 300         if (ri->enable_reg[0] == ri->enable_reg[1] &&
 301             ri->enable_bit[0] == ri->enable_bit[1])
 302                         return 0;
 303
 304         ret = tps6586x_read(parent, ri->enable_reg[0], &val1);
 305         if (ret)
 306                 return ret;
 307
 308         ret = tps6586x_read(parent, ri->enable_reg[1], &val2);
 309         if (ret)
 310                 return ret;
 311
 312         if (!(val2 & (1 << ri->enable_bit[1])))
 313                 return 0;
 314
 315         /*
 316          * The regulator is on, but it's enabled with the bit we don't
 317          * want to use, so we switch the enable bits
 318          */
 319         if (!(val1 & (1 << ri->enable_bit[0]))) {
 320                 ret = tps6586x_set_bits(parent, ri->enable_reg[0],
 321                                         1 << ri->enable_bit[0]);
 322                 if (ret)
 323                         return ret;
 324         }
 325
 326         return tps6586x_clr_bits(parent, ri->enable_reg[1],
 327                                  1 << ri->enable_bit[1]);
 328 }
 329
 330 static inline struct tps6586x_regulator *find_regulator_info(int id)
 331 {
 332         struct tps6586x_regulator *ri;
 333         int i;
 334
 335         for (i = 0; i < ARRAY_SIZE(tps6586x_regulator); i++) {
 336                 ri = &tps6586x_regulator[i];
 337                 if (ri->desc.id == id)
 338                         return ri;
 339         }
 340         return NULL;
 341 }
 342
 343 static int __devinit tps6586x_regulator_probe(struct platform_device *pdev)
 344 {
 345         struct tps6586x_regulator *ri = NULL;
 346         struct regulator_dev *rdev;
 347         int id = pdev->id;
 348         int err;
 349
 350         dev_dbg(&pdev->dev, "Probing reulator %d\n", id);
 351
 352         ri = find_regulator_info(id);
 353         if (ri == NULL) {
 354                 dev_err(&pdev->dev, "invalid regulator ID specified\n");
 355                 return -EINVAL;
 356         }
 357
 358         err = tps6586x_regulator_preinit(pdev->dev.parent, ri);
 359         if (err)
 360                 return err;
 361
 362         rdev = regulator_register(&ri->desc, &pdev->dev,
 363                                   pdev->dev.platform_data, ri);
 364         if (IS_ERR(rdev)) {
 365                 dev_err(&pdev->dev, "failed to register regulator %s\n",
 366                                 ri->desc.name);
 367                 return PTR_ERR(rdev);
 368         }
 369
 370         platform_set_drvdata(pdev, rdev);
 371
 372         return 0;
 373 }
 374
 375 static int __devexit tps6586x_regulator_remove(struct platform_device *pdev)
 376 {
 377         struct regulator_dev *rdev = platform_get_drvdata(pdev);
 378
 379         regulator_unregister(rdev);
 380         return 0;
 381 }
 382
 383 static struct platform_driver tps6586x_regulator_driver = {
 384         .driver = {
 385                 .name   = "tps6586x-regulator",
 386                 .owner  = THIS_MODULE,
 387         },
 388         .probe          = tps6586x_regulator_probe,
 389         .remove         = __devexit_p(tps6586x_regulator_remove),
 390 };
 391
 392 static int __init tps6586x_regulator_init(void)
 393 {
 394         return platform_driver_register(&tps6586x_regulator_driver);
 395 }
 396 subsys_initcall(tps6586x_regulator_init);
 397
 398 static void __exit tps6586x_regulator_exit(void)
 399 {
 400         platform_driver_unregister(&tps6586x_regulator_driver);
 401 }
 402 module_exit(tps6586x_regulator_exit);
 403
 404 MODULE_LICENSE("GPL");
 405 MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
 406 MODULE_DESCRIPTION("Regulator Driver for TI TPS6586X PMIC");
 407 MODULE_ALIAS("platform:tps6586x-regulator");