drivers/regulator/twl4030-regulator.c

   1 /*
   2  * twl4030-regulator.c -- support regulators in twl4030 family chips
   3  *
   4  * Copyright (C) 2008 David Brownell
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/err.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/regulator/driver.h>
  17 #include <linux/regulator/machine.h>
  18 #include <linux/i2c/twl4030.h>
  19
  20
  21 /*
  22  * The TWL4030/TW5030/TPS659x0 family chips include power management, a
  23  * USB OTG transceiver, an RTC, ADC, PWM, and lots more.  Some versions
  24  * include an audio codec, battery charger, and more voltage regulators.
  25  * These chips are often used in OMAP-based systems.
  26  *
  27  * This driver implements software-based resource control for various
  28  * voltage regulators.  This is usually augmented with state machine
  29  * based control.
  30  */
  31
  32 struct twlreg_info {
  33         /* start of regulator's PM_RECEIVER control register bank */
  34         u8                      base;
  35
  36         /* twl4030 resource ID, for resource control state machine */
  37         u8                      id;
  38
  39         /* voltage in mV = table[VSEL]; table_len must be a power-of-two */
  40         u8                      table_len;
  41         const u16               *table;
  42
  43         /* chip constraints on regulator behavior */
  44         u16                     min_mV;
  45
  46         /* used by regulator core */
  47         struct regulator_desc   desc;
  48 };
  49
  50
  51 /* LDO control registers ... offset is from the base of its register bank.
  52  * The first three registers of all power resource banks help hardware to
  53  * manage the various resource groups.
  54  */
  55 #define VREG_GRP                0
  56 #define VREG_TYPE               1
  57 #define VREG_REMAP              2
  58 #define VREG_DEDICATED          3       /* LDO control */
  59
  60
  61 static inline int
  62 twl4030reg_read(struct twlreg_info *info, unsigned offset)
  63 {
  64         u8 value;
  65         int status;
  66
  67         status = twl4030_i2c_read_u8(TWL4030_MODULE_PM_RECEIVER,
  68                         &value, info->base + offset);
  69         return (status < 0) ? status : value;
  70 }
  71
  72 static inline int
  73 twl4030reg_write(struct twlreg_info *info, unsigned offset, u8 value)
  74 {
  75         return twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER,
  76                         value, info->base + offset);
  77 }
  78
  79 /*----------------------------------------------------------------------*/
  80
  81 /* generic power resource operations, which work on all regulators */
  82
  83 static int twl4030reg_grp(struct regulator_dev *rdev)
  84 {
  85         return twl4030reg_read(rdev_get_drvdata(rdev), VREG_GRP);
  86 }
  87
  88 /*
  89  * Enable/disable regulators by joining/leaving the P1 (processor) group.
  90  * We assume nobody else is updating the DEV_GRP registers.
  91  */
  92
  93 #define P3_GRP          BIT(7)          /* "peripherals" */
  94 #define P2_GRP          BIT(6)          /* secondary processor, modem, etc */
  95 #define P1_GRP          BIT(5)          /* CPU/Linux */
  96
  97 static int twl4030reg_is_enabled(struct regulator_dev *rdev)
  98 {
  99         int     state = twl4030reg_grp(rdev);
 100
 101         if (state < 0)
 102                 return state;
 103
 104         return (state & P1_GRP) != 0;
 105 }
 106
 107 static int twl4030reg_enable(struct regulator_dev *rdev)
 108 {
 109         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 110         int                     grp;
 111
 112         grp = twl4030reg_read(info, VREG_GRP);
 113         if (grp < 0)
 114                 return grp;
 115
 116         grp |= P1_GRP;
 117         return twl4030reg_write(info, VREG_GRP, grp);
 118 }
 119
 120 static int twl4030reg_disable(struct regulator_dev *rdev)
 121 {
 122         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 123         int                     grp;
 124
 125         grp = twl4030reg_read(info, VREG_GRP);
 126         if (grp < 0)
 127                 return grp;
 128
 129         grp &= ~P1_GRP;
 130         return twl4030reg_write(info, VREG_GRP, grp);
 131 }
 132
 133 static int twl4030reg_get_status(struct regulator_dev *rdev)
 134 {
 135         int     state = twl4030reg_grp(rdev);
 136
 137         if (state < 0)
 138                 return state;
 139         state &= 0x0f;
 140
 141         /* assume state != WARM_RESET; we'd not be running...  */
 142         if (!state)
 143                 return REGULATOR_STATUS_OFF;
 144         return (state & BIT(3))
 145                 ? REGULATOR_STATUS_NORMAL
 146                 : REGULATOR_STATUS_STANDBY;
 147 }
 148
 149 static int twl4030reg_set_mode(struct regulator_dev *rdev, unsigned mode)
 150 {
 151         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 152         unsigned                message;
 153         int                     status;
 154
 155         /* We can only set the mode through state machine commands... */
 156         switch (mode) {
 157         case REGULATOR_MODE_NORMAL:
 158                 message = MSG_SINGULAR(DEV_GRP_P1, info->id, RES_STATE_ACTIVE);
 159                 break;
 160         case REGULATOR_MODE_STANDBY:
 161                 message = MSG_SINGULAR(DEV_GRP_P1, info->id, RES_STATE_SLEEP);
 162                 break;
 163         default:
 164                 return -EINVAL;
 165         }
 166
 167         /* Ensure the resource is associated with some group */
 168         status = twl4030reg_grp(rdev);
 169         if (status < 0)
 170                 return status;
 171         if (!(status & (P3_GRP | P2_GRP | P1_GRP)))
 172                 return -EACCES;
 173
 174         status = twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER,
 175                         message >> 8, 0x15 /* PB_WORD_MSB */ );
 176         if (status >= 0)
 177                 return status;
 178
 179         return twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER,
 180                         message, 0x16 /* PB_WORD_LSB */ );
 181 }
 182
 183 /*----------------------------------------------------------------------*/
 184
 185 /*
 186  * Support for adjustable-voltage LDOs uses a four bit (or less) voltage
 187  * select field in its control register.   We use tables indexed by VSEL
 188  * to record voltages in milliVolts.  (Accuracy is about three percent.)
 189  *
 190  * Note that VSEL values for VAUX2 changed in twl5030 and newer silicon;
 191  * currently handled by listing two slightly different VAUX2 regulators,
 192  * only one of which will be configured.
 193  *
 194  * VSEL values documented as "TI cannot support these values" are flagged
 195  * in these tables as UNSUP() values; we normally won't assign them.
 196  *
 197  * VAUX3 at 3V is incorrectly listed in some TI manuals as unsupported.
 198  * TI are revising the twl5030/tps659x0 specs to support that 3.0V setting.
 199  */
 200 #ifdef CONFIG_TWL4030_ALLOW_UNSUPPORTED
 201 #define UNSUP_MASK      0x0000
 202 #else
 203 #define UNSUP_MASK      0x8000
 204 #endif
 205
 206 #define UNSUP(x)        (UNSUP_MASK | (x))
 207 #define IS_UNSUP(x)     (UNSUP_MASK & (x))
 208 #define LDO_MV(x)       (~UNSUP_MASK & (x))
 209
 210
 211 static const u16 VAUX1_VSEL_table[] = {
 212         UNSUP(1500), UNSUP(1800), 2500, 2800,
 213         3000, 3000, 3000, 3000,
 214 };
 215 static const u16 VAUX2_4030_VSEL_table[] = {
 216         UNSUP(1000), UNSUP(1000), UNSUP(1200), 1300,
 217         1500, 1800, UNSUP(1850), 2500,
 218         UNSUP(2600), 2800, UNSUP(2850), UNSUP(3000),
 219         UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
 220 };
 221 static const u16 VAUX2_VSEL_table[] = {
 222         1700, 1700, 1900, 1300,
 223         1500, 1800, 2000, 2500,
 224         2100, 2800, 2200, 2300,
 225         2400, 2400, 2400, 2400,
 226 };
 227 static const u16 VAUX3_VSEL_table[] = {
 228         1500, 1800, 2500, 2800,
 229         3000, 3000, 3000, 3000,
 230 };
 231 static const u16 VAUX4_VSEL_table[] = {
 232         700, 1000, 1200, UNSUP(1300),
 233         1500, 1800, UNSUP(1850), 2500,
 234         UNSUP(2600), 2800, UNSUP(2850), UNSUP(3000),
 235         UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
 236 };
 237 static const u16 VMMC1_VSEL_table[] = {
 238         1850, 2850, 3000, 3150,
 239 };
 240 static const u16 VMMC2_VSEL_table[] = {
 241         UNSUP(1000), UNSUP(1000), UNSUP(1200), UNSUP(1300),
 242         UNSUP(1500), UNSUP(1800), 1850, UNSUP(2500),
 243         2600, 2800, 2850, 3000,
 244         3150, 3150, 3150, 3150,
 245 };
 246 static const u16 VPLL1_VSEL_table[] = {
 247         1000, 1200, 1300, 1800,
 248         UNSUP(2800), UNSUP(3000), UNSUP(3000), UNSUP(3000),
 249 };
 250 static const u16 VPLL2_VSEL_table[] = {
 251         700, 1000, 1200, 1300,
 252         UNSUP(1500), 1800, UNSUP(1850), UNSUP(2500),
 253         UNSUP(2600), UNSUP(2800), UNSUP(2850), UNSUP(3000),
 254         UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
 255 };
 256 static const u16 VSIM_VSEL_table[] = {
 257         UNSUP(1000), UNSUP(1200), UNSUP(1300), 1800,
 258         2800, 3000, 3000, 3000,
 259 };
 260 static const u16 VDAC_VSEL_table[] = {
 261         1200, 1300, 1800, 1800,
 262 };
 263
 264
 265 static int twl4030ldo_list_voltage(struct regulator_dev *rdev, unsigned index)
 266 {
 267         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 268         int                     mV = info->table[index];
 269
 270         return IS_UNSUP(mV) ? 0 : (LDO_MV(mV) * 1000);
 271 }
 272
 273 static int
 274 twl4030ldo_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV)
 275 {
 276         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 277         int                     vsel;
 278
 279         for (vsel = 0; vsel < info->table_len; vsel++) {
 280                 int mV = info->table[vsel];
 281                 int uV;
 282
 283                 if (IS_UNSUP(mV))
 284                         continue;
 285                 uV = LDO_MV(mV) * 1000;
 286
 287                 /* REVISIT for VAUX2, first match may not be best/lowest */
 288
 289                 /* use the first in-range value */
 290                 if (min_uV <= uV && uV <= max_uV)
 291                         return twl4030reg_write(info, VREG_DEDICATED, vsel);
 292         }
 293
 294         return -EDOM;
 295 }
 296
 297 static int twl4030ldo_get_voltage(struct regulator_dev *rdev)
 298 {
 299         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 300         int                     vsel = twl4030reg_read(info, VREG_DEDICATED);
 301
 302         if (vsel < 0)
 303                 return vsel;
 304
 305         vsel &= info->table_len - 1;
 306         return LDO_MV(info->table[vsel]) * 1000;
 307 }
 308
 309 static struct regulator_ops twl4030ldo_ops = {
 310         .list_voltage   = twl4030ldo_list_voltage,
 311
 312         .set_voltage    = twl4030ldo_set_voltage,
 313         .get_voltage    = twl4030ldo_get_voltage,
 314
 315         .enable         = twl4030reg_enable,
 316         .disable        = twl4030reg_disable,
 317         .is_enabled     = twl4030reg_is_enabled,
 318
 319         .set_mode       = twl4030reg_set_mode,
 320
 321         .get_status     = twl4030reg_get_status,
 322 };
 323
 324 /*----------------------------------------------------------------------*/
 325
 326 /*
 327  * Fixed voltage LDOs don't have a VSEL field to update.
 328  */
 329 static int twl4030fixed_list_voltage(struct regulator_dev *rdev, unsigned index)
 330 {
 331         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 332
 333         return info->min_mV * 1000;
 334 }
 335
 336 static int twl4030fixed_get_voltage(struct regulator_dev *rdev)
 337 {
 338         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 339
 340         return info->min_mV * 1000;
 341 }
 342
 343 static struct regulator_ops twl4030fixed_ops = {
 344         .list_voltage   = twl4030fixed_list_voltage,
 345
 346         .get_voltage    = twl4030fixed_get_voltage,
 347
 348         .enable         = twl4030reg_enable,
 349         .disable        = twl4030reg_disable,
 350         .is_enabled     = twl4030reg_is_enabled,
 351
 352         .set_mode       = twl4030reg_set_mode,
 353
 354         .get_status     = twl4030reg_get_status,
 355 };
 356
 357 /*----------------------------------------------------------------------*/
 358
 359 #define TWL_ADJUSTABLE_LDO(label, offset, num) { \
 360         .base = offset, \
 361         .id = num, \
 362         .table_len = ARRAY_SIZE(label##_VSEL_table), \
 363         .table = label##_VSEL_table, \
 364         .desc = { \
 365                 .name = #label, \
 366                 .id = TWL4030_REG_##label, \
 367                 .n_voltages = ARRAY_SIZE(label##_VSEL_table), \
 368                 .ops = &twl4030ldo_ops, \
 369                 .type = REGULATOR_VOLTAGE, \
 370                 .owner = THIS_MODULE, \
 371                 }, \
 372         }
 373
 374 #define TWL_FIXED_LDO(label, offset, mVolts, num) { \
 375         .base = offset, \
 376         .id = num, \
 377         .min_mV = mVolts, \
 378         .desc = { \
 379                 .name = #label, \
 380                 .id = TWL4030_REG_##label, \
 381                 .n_voltages = 1, \
 382                 .ops = &twl4030fixed_ops, \
 383                 .type = REGULATOR_VOLTAGE, \
 384                 .owner = THIS_MODULE, \
 385                 }, \
 386         }
 387
 388 /*
 389  * We list regulators here if systems need some level of
 390  * software control over them after boot.
 391  */
 392 static struct twlreg_info twl4030_regs[] = {
 393         TWL_ADJUSTABLE_LDO(VAUX1, 0x17, 1),
 394         TWL_ADJUSTABLE_LDO(VAUX2_4030, 0x1b, 2),
 395         TWL_ADJUSTABLE_LDO(VAUX2, 0x1b, 2),
 396         TWL_ADJUSTABLE_LDO(VAUX3, 0x1f, 3),
 397         TWL_ADJUSTABLE_LDO(VAUX4, 0x23, 4),
 398         TWL_ADJUSTABLE_LDO(VMMC1, 0x27, 5),
 399         TWL_ADJUSTABLE_LDO(VMMC2, 0x2b, 6),
 400         /*
 401         TWL_ADJUSTABLE_LDO(VPLL1, 0x2f, 7),
 402         */
 403         TWL_ADJUSTABLE_LDO(VPLL2, 0x33, 8),
 404         TWL_ADJUSTABLE_LDO(VSIM, 0x37, 9),
 405         TWL_ADJUSTABLE_LDO(VDAC, 0x3b, 10),
 406         /*
 407         TWL_ADJUSTABLE_LDO(VINTANA1, 0x3f, 11),
 408         TWL_ADJUSTABLE_LDO(VINTANA2, 0x43, 12),
 409         TWL_ADJUSTABLE_LDO(VINTDIG, 0x47, 13),
 410         TWL_SMPS(VIO, 0x4b, 14),
 411         TWL_SMPS(VDD1, 0x55, 15),
 412         TWL_SMPS(VDD2, 0x63, 16),
 413          */
 414         TWL_FIXED_LDO(VUSB1V5, 0x71, 1500, 17),
 415         TWL_FIXED_LDO(VUSB1V8, 0x74, 1800, 18),
 416         TWL_FIXED_LDO(VUSB3V1, 0x77, 3100, 19),
 417         /* VUSBCP is managed *only* by the USB subchip */
 418 };
 419
 420 static int twl4030reg_probe(struct platform_device *pdev)
 421 {
 422         int                             i;
 423         struct twlreg_info              *info;
 424         struct regulator_init_data      *initdata;
 425         struct regulation_constraints   *c;
 426         struct regulator_dev            *rdev;
 427
 428         for (i = 0, info = NULL; i < ARRAY_SIZE(twl4030_regs); i++) {
 429                 if (twl4030_regs[i].desc.id != pdev->id)
 430                         continue;
 431                 info = twl4030_regs + i;
 432                 break;
 433         }
 434         if (!info)
 435                 return -ENODEV;
 436
 437         initdata = pdev->dev.platform_data;
 438         if (!initdata)
 439                 return -EINVAL;
 440
 441         /* Constrain board-specific capabilities according to what
 442          * this driver and the chip itself can actually do.
 443          */
 444         c = &initdata->constraints;
 445         c->valid_modes_mask &= REGULATOR_MODE_NORMAL | REGULATOR_MODE_STANDBY;
 446         c->valid_ops_mask &= REGULATOR_CHANGE_VOLTAGE
 447                                 | REGULATOR_CHANGE_MODE
 448                                 | REGULATOR_CHANGE_STATUS;
 449
 450         rdev = regulator_register(&info->desc, &pdev->dev, initdata, info);
 451         if (IS_ERR(rdev)) {
 452                 dev_err(&pdev->dev, "can't register %s, %ld\n",
 453                                 info->desc.name, PTR_ERR(rdev));
 454                 return PTR_ERR(rdev);
 455         }
 456         platform_set_drvdata(pdev, rdev);
 457
 458         /* NOTE:  many regulators support short-circuit IRQs (presentable
 459          * as REGULATOR_OVER_CURRENT notifications?) configured via:
 460          *  - SC_CONFIG
 461          *  - SC_DETECT1 (vintana2, vmmc1/2, vaux1/2/3/4)
 462          *  - SC_DETECT2 (vusb, vdac, vio, vdd1/2, vpll2)
 463          *  - IT_CONFIG
 464          */
 465
 466         return 0;
 467 }
 468
 469 static int __devexit twl4030reg_remove(struct platform_device *pdev)
 470 {
 471         regulator_unregister(platform_get_drvdata(pdev));
 472         return 0;
 473 }
 474
 475 MODULE_ALIAS("platform:twl4030_reg");
 476
 477 static struct platform_driver twl4030reg_driver = {
 478         .probe          = twl4030reg_probe,
 479         .remove         = __devexit_p(twl4030reg_remove),
 480         /* NOTE: short name, to work around driver model truncation of
 481          * "twl4030_regulator.12" (and friends) to "twl4030_regulator.1".
 482          */
 483         .driver.name    = "twl4030_reg",
 484         .driver.owner   = THIS_MODULE,
 485 };
 486
 487 static int __init twl4030reg_init(void)
 488 {
 489         return platform_driver_register(&twl4030reg_driver);
 490 }
 491 subsys_initcall(twl4030reg_init);
 492
 493 static void __exit twl4030reg_exit(void)
 494 {
 495         platform_driver_unregister(&twl4030reg_driver);
 496 }
 497 module_exit(twl4030reg_exit)
 498
 499 MODULE_DESCRIPTION("TWL4030 regulator driver");
 500 MODULE_LICENSE("GPL");