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, 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, goreg, gobit)    \
 235 {                                                                       \
 236         .desc   = {                                                     \
 237                 .name   = "REG-" #_id,                                  \
 238                 .ops    = &tps6586x_regulator_##_ops,                   \
 239                 .type   = REGULATOR_VOLTAGE,                            \
 240                 .id     = TPS6586X_ID_##_id,                            \
 241                 .n_voltages = ARRAY_SIZE(tps6586x_##vdata##_voltages),  \
 242                 .owner  = THIS_MODULE,                                  \
 243         },                                                              \
 244         .volt_reg       = TPS6586X_##vreg,                              \
 245         .volt_shift     = (shift),                                      \
 246         .volt_nbits     = (nbits),                                      \
 247         .enable_reg[0]  = TPS6586X_SUPPLY##ereg0,                       \
 248         .enable_bit[0]  = (ebit0),                                      \
 249         .enable_reg[1]  = TPS6586X_SUPPLY##ereg1,                       \
 250         .enable_bit[1]  = (ebit1),                                      \
 251         .voltages       = tps6586x_##vdata##_voltages,                  \
 252 }
 253
 254 #define TPS6586X_LDO(_id, vdata, vreg, shift, nbits,                    \
 255                      ereg0, ebit0, ereg1, ebit1)                        \
 256         TPS6586X_REGULATOR(_id, vdata, ldo_ops, vreg, shift, nbits,     \
 257                            ereg0, ebit0, ereg1, ebit1, 0, 0)
 258
 259 #define TPS6586X_DVM(_id, vdata, vreg, shift, nbits,                    \
 260                      ereg0, ebit0, ereg1, ebit1, goreg, gobit)          \
 261         TPS6586X_REGULATOR(_id, vdata, dvm_ops, vreg, shift, nbits,     \
 262                            ereg0, ebit0, ereg1, ebit1, goreg, gobit)
 263
 264 static struct tps6586x_regulator tps6586x_regulator[] = {
 265         TPS6586X_LDO(LDO_0, ldo, SUPPLYV1, 5, 3, ENC, 0, END, 0),
 266         TPS6586X_LDO(LDO_3, ldo, SUPPLYV4, 0, 3, ENC, 2, END, 2),
 267         TPS6586X_LDO(LDO_5, ldo, SUPPLYV6, 0, 3, ENE, 6, ENE, 6),
 268         TPS6586X_LDO(LDO_6, ldo, SUPPLYV3, 0, 3, ENC, 4, END, 4),
 269         TPS6586X_LDO(LDO_7, ldo, SUPPLYV3, 3, 3, ENC, 5, END, 5),
 270         TPS6586X_LDO(LDO_8, ldo, SUPPLYV1, 5, 3, ENC, 6, END, 6),
 271         TPS6586X_LDO(LDO_9, ldo, SUPPLYV6, 3, 3, ENE, 7, ENE, 7),
 272         TPS6586X_LDO(LDO_RTC, ldo, SUPPLYV4, 3, 3, ENE, 7, ENE, 7),
 273         TPS6586X_LDO(LDO_1, dvm, SUPPLYV1, 0, 5, ENC, 1, END, 1),
 274         TPS6586X_LDO(SM_2, sm2, SUPPLYV2, 0, 5, ENC, 1, END, 1),
 275
 276         TPS6586X_DVM(LDO_2, dvm, LDO2BV1, 0, 5, ENA, 3, ENB, 3, VCC2, 6),
 277         TPS6586X_DVM(LDO_4, ldo4, LDO4V1, 0, 5, ENC, 3, END, 3, VCC1, 6),
 278         TPS6586X_DVM(SM_0, dvm, SM0V1, 0, 5, ENA, 1, ENB, 1, VCC1, 2),
 279         TPS6586X_DVM(SM_1, dvm, SM1V1, 0, 5, ENA, 0, ENB, 0, VCC1, 0),
 280 };
 281
 282 /*
 283  * TPS6586X has 2 enable bits that are OR'ed to determine the actual
 284  * regulator state. Clearing one of this bits allows switching
 285  * regulator on and of with single register write.
 286  */
 287 static inline int tps6586x_regulator_preinit(struct device *parent,
 288                                              struct tps6586x_regulator *ri)
 289 {
 290         uint8_t val1, val2;
 291         int ret;
 292
 293         ret = tps6586x_read(parent, ri->enable_reg[0], &val1);
 294         if (ret)
 295                 return ret;
 296
 297         ret = tps6586x_read(parent, ri->enable_reg[1], &val2);
 298         if (ret)
 299                 return ret;
 300
 301         if (!(val2 & ri->enable_bit[1]))
 302                 return 0;
 303
 304         /*
 305          * The regulator is on, but it's enabled with the bit we don't
 306          * want to use, so we switch the enable bits
 307          */
 308         if (!(val1 & ri->enable_bit[0])) {
 309                 ret = tps6586x_set_bits(parent, ri->enable_reg[0],
 310                                         1 << ri->enable_bit[0]);
 311                 if (ret)
 312                         return ret;
 313         }
 314
 315         return tps6586x_clr_bits(parent, ri->enable_reg[1],
 316                                  1 << ri->enable_bit[1]);
 317 }
 318
 319 static inline struct tps6586x_regulator *find_regulator_info(int id)
 320 {
 321         struct tps6586x_regulator *ri;
 322         int i;
 323
 324         for (i = 0; i < ARRAY_SIZE(tps6586x_regulator); i++) {
 325                 ri = &tps6586x_regulator[i];
 326                 if (ri->desc.id == id)
 327                         return ri;
 328         }
 329         return NULL;
 330 }
 331
 332 static int __devinit tps6586x_regulator_probe(struct platform_device *pdev)
 333 {
 334         struct tps6586x_regulator *ri = NULL;
 335         struct regulator_dev *rdev;
 336         int id = pdev->id;
 337         int err;
 338
 339         dev_dbg(&pdev->dev, "Probing reulator %d\n", id);
 340
 341         ri = find_regulator_info(id);
 342         if (ri == NULL) {
 343                 dev_err(&pdev->dev, "invalid regulator ID specified\n");
 344                 return -EINVAL;
 345         }
 346
 347         err = tps6586x_regulator_preinit(pdev->dev.parent, ri);
 348         if (err)
 349                 return err;
 350
 351         rdev = regulator_register(&ri->desc, &pdev->dev,
 352                                   pdev->dev.platform_data, ri);
 353         if (IS_ERR(rdev)) {
 354                 dev_err(&pdev->dev, "failed to register regulator %s\n",
 355                                 ri->desc.name);
 356                 return PTR_ERR(rdev);
 357         }
 358
 359         platform_set_drvdata(pdev, rdev);
 360
 361         return 0;
 362 }
 363
 364 static int __devexit tps6586x_regulator_remove(struct platform_device *pdev)
 365 {
 366         struct regulator_dev *rdev = platform_get_drvdata(pdev);
 367
 368         regulator_unregister(rdev);
 369         return 0;
 370 }
 371
 372 static struct platform_driver tps6586x_regulator_driver = {
 373         .driver = {
 374                 .name   = "tps6586x-regulator",
 375                 .owner  = THIS_MODULE,
 376         },
 377         .probe          = tps6586x_regulator_probe,
 378         .remove         = __devexit_p(tps6586x_regulator_remove),
 379 };
 380
 381 static int __init tps6586x_regulator_init(void)
 382 {
 383         return platform_driver_register(&tps6586x_regulator_driver);
 384 }
 385 subsys_initcall(tps6586x_regulator_init);
 386
 387 static void __exit tps6586x_regulator_exit(void)
 388 {
 389         platform_driver_unregister(&tps6586x_regulator_driver);
 390 }
 391 module_exit(tps6586x_regulator_exit);
 392
 393 MODULE_LICENSE("GPL");
 394 MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
 395 MODULE_DESCRIPTION("Regulator Driver for TI TPS6586X PMIC");
 396 MODULE_ALIAS("platform:tps6586x-regulator");