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         /* FIXED_LDO voltage */
  40         u8                      deciV;
  41
  42         /* voltage in mV = table[VSEL]; table_len must be a power-of-two */
  43         u8                      table_len;
  44         const u16               *table;
  45
  46         /* used by regulator core */
  47         struct regulator_desc   desc;
  48 };
  49
  50 #ifndef REGULATOR_MODE_OFF
  51 #define REGULATOR_MODE_OFF 0
  52 #endif
  53
  54
  55 /* LDO control registers ... offset is from the base of its register bank.
  56  * The first three registers of all power resource banks help hardware to
  57  * manage the various resource groups.
  58  */
  59 #define VREG_GRP                0
  60 #define VREG_TYPE               1
  61 #define VREG_REMAP              2
  62 #define VREG_DEDICATED          3       /* LDO control */
  63
  64
  65 static inline int
  66 twl4030reg_read(struct twlreg_info *info, unsigned offset)
  67 {
  68         u8 value;
  69         int status;
  70
  71         status = twl4030_i2c_read_u8(TWL4030_MODULE_PM_RECEIVER,
  72                         &value, info->base + offset);
  73         return (status < 0) ? status : value;
  74 }
  75
  76 static inline int
  77 twl4030reg_write(struct twlreg_info *info, unsigned offset, u8 value)
  78 {
  79         return twl4030_i2c_write_u8(TWL4030_MODULE_PM_RECEIVER,
  80                         value, info->base + offset);
  81 }
  82
  83 /*----------------------------------------------------------------------*/
  84
  85 /* generic power resource operations, which work on all regulators */
  86
  87 static int twl4030reg_grp(struct regulator_dev *rdev)
  88 {
  89         return twl4030reg_read(rdev_get_drvdata(rdev), VREG_GRP);
  90 }
  91
  92 /*
  93  * Enable/disable regulators by joining/leaving the P1 (processor) group.
  94  * We assume nobody else is updating the DEV_GRP registers.
  95  */
  96
  97 #define P3_GRP          BIT(7)          /* "peripherals" */
  98 #define P2_GRP          BIT(6)          /* secondary processor, modem, etc */
  99 #define P1_GRP          BIT(5)          /* CPU/Linux */
 100 #define WARM_CFG        BIT(4)
 101
 102 static int twl4030reg_is_enabled(struct regulator_dev *rdev)
 103 {
 104         int     state = twl4030reg_grp(rdev);
 105
 106         if (state < 0)
 107                 return state;
 108
 109         return (state & P1_GRP) != 0;
 110 }
 111
 112 static int twl4030reg_enable(struct regulator_dev *rdev)
 113 {
 114         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 115         int                     grp;
 116
 117         grp = twl4030reg_read(info, VREG_GRP);
 118         if (grp < 0)
 119                 return grp;
 120
 121         grp |= P1_GRP;
 122         return twl4030reg_write(info, VREG_GRP, grp);
 123 }
 124
 125 static int twl4030reg_disable(struct regulator_dev *rdev)
 126 {
 127         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 128         int                     grp;
 129
 130         grp = twl4030reg_read(info, VREG_GRP);
 131         if (grp < 0)
 132                 return grp;
 133
 134         grp &= ~P1_GRP;
 135         return twl4030reg_write(info, VREG_GRP, grp);
 136 }
 137
 138 static int twl4030reg_get_status(struct regulator_dev *rdev)
 139 {
 140         int     state = twl4030reg_grp(rdev);
 141
 142         if (state < 0)
 143                 return state;
 144         state &= 0x0f;
 145
 146         /* assume state != WARM_RESET; we'd not be running...  */
 147         if (!state)
 148                 return REGULATOR_STATUS_OFF;
 149         return (state & BIT(3))
 150                 ? REGULATOR_STATUS_NORMAL
 151                 : REGULATOR_STATUS_STANDBY;
 152 }
 153
 154 static int twl4030reg_set_mode(struct regulator_dev *rdev, unsigned mode)
 155 {
 156         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 157         unsigned                message;
 158         int                     status;
 159
 160         /* We can only set the mode through state machine commands... */
 161         switch (mode) {
 162         case REGULATOR_MODE_NORMAL:
 163                 message = MSG_SINGULAR(DEV_GRP_P1, info->id, RES_STATE_ACTIVE);
 164                 break;
 165         case REGULATOR_MODE_STANDBY:
 166                 message = MSG_SINGULAR(DEV_GRP_P1, info->id, RES_STATE_SLEEP);
 167                 break;
 168         default:
 169                 return -EINVAL;
 170         }
 171
 172         /* Ensure the resource is associated with some group */
 173         status = twl4030reg_grp(rdev);
 174         if (status < 0)
 175                 return status;
 176         if (!(status & (P3_GRP | P2_GRP | P1_GRP)))
 177                 return -EACCES;
 178
 179         status = twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER,
 180                         message >> 8, 0x15 /* PB_WORD_MSB */ );
 181         if (status >= 0)
 182                 return status;
 183
 184         return twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER,
 185                         message, 0x16 /* PB_WORD_LSB */ );
 186 }
 187
 188 /*----------------------------------------------------------------------*/
 189
 190 /*
 191  * Support for adjustable-voltage LDOs uses a four bit (or less) voltage
 192  * select field in its control register.   We use tables indexed by VSEL
 193  * to record voltages in milliVolts.  (Accuracy is about three percent.)
 194  *
 195  * Note that VSEL values for VAUX2 changed in twl5030 and newer silicon;
 196  * currently handled by listing two slightly different VAUX2 regulators,
 197  * only one of which will be configured.
 198  *
 199  * VSEL values documented as "TI cannot support these values" are flagged
 200  * in these tables as UNSUP() values; we normally won't assign them.
 201  */
 202 #ifdef CONFIG_TWL4030_ALLOW_UNSUPPORTED
 203 #define UNSUP_MASK      0x0000
 204 #else
 205 #define UNSUP_MASK      0x8000
 206 #endif
 207
 208 #define UNSUP(x)        (UNSUP_MASK | (x))
 209 #define IS_UNSUP(x)     (UNSUP_MASK & (x))
 210 #define LDO_MV(x)       (~UNSUP_MASK & (x))
 211
 212
 213 static const u16 VAUX1_VSEL_table[] = {
 214         UNSUP(1500), UNSUP(1800), 2500, 2800,
 215         3000, 3000, 3000, 3000,
 216 };
 217 static const u16 VAUX2_4030_VSEL_table[] = {
 218         UNSUP(1000), UNSUP(1000), UNSUP(1200), 1300,
 219         1500, 1800, UNSUP(1850), 2500,
 220         UNSUP(2600), 2800, UNSUP(2850), UNSUP(3000),
 221         UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
 222 };
 223 static const u16 VAUX2_VSEL_table[] = {
 224         1700, 1700, 1900, 1300,
 225         1500, 1800, 2000, 2500,
 226         2100, 2800, 2200, 2300,
 227         2400, 2400, 2400, 2400,
 228 };
 229 static const u16 VAUX3_VSEL_table[] = {
 230         1500, 1800, 2500, 2800,
 231         UNSUP(3000), UNSUP(3000), UNSUP(3000), UNSUP(3000),
 232 };
 233 static const u16 VAUX4_VSEL_table[] = {
 234         700, 1000, 1200, UNSUP(1300),
 235         1500, 1800, UNSUP(1850), 2500,
 236         UNSUP(2600), 2800, UNSUP(2850), UNSUP(3000),
 237         UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
 238 };
 239 static const u16 VMMC1_VSEL_table[] = {
 240         1850, 2850, 3000, 3150,
 241 };
 242 static const u16 VMMC2_VSEL_table[] = {
 243         UNSUP(1000), UNSUP(1000), UNSUP(1200), UNSUP(1300),
 244         UNSUP(1500), UNSUP(1800), 1850, UNSUP(2500),
 245         2600, 2800, 2850, 3000,
 246         3150, 3150, 3150, 3150,
 247 };
 248 static const u16 VPLL1_VSEL_table[] = {
 249         1000, 1200, 1300, 1800,
 250         UNSUP(2800), UNSUP(3000), UNSUP(3000), UNSUP(3000),
 251 };
 252 static const u16 VPLL2_VSEL_table[] = {
 253         700, 1000, 1200, 1300,
 254         UNSUP(1500), 1800, UNSUP(1850), UNSUP(2500),
 255         UNSUP(2600), UNSUP(2800), UNSUP(2850), UNSUP(3000),
 256         UNSUP(3150), UNSUP(3150), UNSUP(3150), UNSUP(3150),
 257 };
 258 static const u16 VSIM_VSEL_table[] = {
 259         UNSUP(1000), UNSUP(1200), UNSUP(1300), 1800,
 260         2800, 3000, 3000, 3000,
 261 };
 262 static const u16 VDAC_VSEL_table[] = {
 263         1200, 1300, 1800, 1800,
 264 };
 265
 266
 267 static int twl4030ldo_list_voltage(struct regulator_dev *rdev, unsigned index)
 268 {
 269         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 270         int                     mV = info->table[index];
 271
 272         return IS_UNSUP(mV) ? 0 : (LDO_MV(mV) * 1000);
 273 }
 274
 275 static int
 276 twl4030ldo_set_voltage(struct regulator_dev *rdev, int min_uV, int max_uV)
 277 {
 278         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 279         int                     vsel;
 280
 281         for (vsel = 0; vsel < info->table_len; vsel++) {
 282                 int mV = info->table[vsel];
 283                 int uV;
 284
 285                 if (IS_UNSUP(mV))
 286                         continue;
 287                 uV = LDO_MV(mV) * 1000;
 288
 289                 /* REVISIT for VAUX2, first match may not be best/lowest */
 290
 291                 /* use the first in-range value */
 292                 if (min_uV <= uV && uV <= max_uV)
 293                         return twl4030reg_write(info, VREG_DEDICATED, vsel);
 294         }
 295
 296         return -EDOM;
 297 }
 298
 299 static int twl4030ldo_get_voltage(struct regulator_dev *rdev)
 300 {
 301         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 302         int                     vsel = twl4030reg_read(info, VREG_DEDICATED);
 303
 304         if (vsel < 0)
 305                 return vsel;
 306
 307         vsel &= info->table_len - 1;
 308         return LDO_MV(info->table[vsel]) * 1000;
 309 }
 310
 311 static struct regulator_ops twl4030ldo_ops = {
 312         .list_voltage   = twl4030ldo_list_voltage,
 313
 314         .set_voltage    = twl4030ldo_set_voltage,
 315         .get_voltage    = twl4030ldo_get_voltage,
 316
 317         .enable         = twl4030reg_enable,
 318         .disable        = twl4030reg_disable,
 319         .is_enabled     = twl4030reg_is_enabled,
 320
 321         .set_mode       = twl4030reg_set_mode,
 322
 323         .get_status     = twl4030reg_get_status,
 324 };
 325
 326 /*----------------------------------------------------------------------*/
 327
 328 /*
 329  * Fixed voltage LDOs don't have a VSEL field to update.
 330  */
 331 static int twl4030fixed_list_voltage(struct regulator_dev *rdev, unsigned index)
 332 {
 333         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 334
 335         return info->deciV * 100 * 1000;
 336 }
 337
 338 static int twl4030fixed_get_voltage(struct regulator_dev *rdev)
 339 {
 340         struct twlreg_info      *info = rdev_get_drvdata(rdev);
 341
 342         return info->deciV * 100 * 1000;
 343 }
 344
 345 static struct regulator_ops twl4030fixed_ops = {
 346         .list_voltage   = twl4030fixed_list_voltage,
 347
 348         .get_voltage    = twl4030fixed_get_voltage,
 349
 350         .enable         = twl4030reg_enable,
 351         .disable        = twl4030reg_disable,
 352         .is_enabled     = twl4030reg_is_enabled,
 353
 354         .set_mode       = twl4030reg_set_mode,
 355
 356         .get_status     = twl4030reg_get_status,
 357 };
 358
 359 /*----------------------------------------------------------------------*/
 360
 361 #define TWL_ADJUSTABLE_LDO(label, offset, num) { \
 362         .base = offset, \
 363         .id = num, \
 364         .table_len = ARRAY_SIZE(label##_VSEL_table), \
 365         .table = label##_VSEL_table, \
 366         .desc = { \
 367                 .name = #label, \
 368                 .id = TWL4030_REG_##label, \
 369                 .n_voltages = ARRAY_SIZE(label##_VSEL_table), \
 370                 .ops = &twl4030ldo_ops, \
 371                 .type = REGULATOR_VOLTAGE, \
 372                 .owner = THIS_MODULE, \
 373                 }, \
 374         }
 375
 376 #define TWL_FIXED_LDO(label, offset, mVolts, num) { \
 377         .base = offset, \
 378         .id = num, \
 379         .deciV = mVolts / 100 , \
 380         .desc = { \
 381                 .name = #label, \
 382                 .id = TWL4030_REG_##label, \
 383                 .n_voltages = 1, \
 384                 .ops = &twl4030fixed_ops, \
 385                 .type = REGULATOR_VOLTAGE, \
 386                 .owner = THIS_MODULE, \
 387                 }, \
 388         }
 389
 390 /*
 391  * We expose regulators here if systems need some level of
 392  * software control over them after boot.
 393  */
 394 static struct twlreg_info twl4030_regs[] = {
 395         TWL_ADJUSTABLE_LDO(VAUX1, 0x17, RES_VAUX1),
 396         TWL_ADJUSTABLE_LDO(VAUX2_4030, 0x1b, RES_VAUX2),
 397         TWL_ADJUSTABLE_LDO(VAUX2, 0x1b, RES_VAUX2),
 398         TWL_ADJUSTABLE_LDO(VAUX3, 0x1f, RES_VAUX3),
 399         TWL_ADJUSTABLE_LDO(VAUX4, 0x23, RES_VAUX4),
 400         TWL_ADJUSTABLE_LDO(VMMC1, 0x27, RES_VMMC1),
 401         TWL_ADJUSTABLE_LDO(VMMC2, 0x2b, RES_VMMC2),
 402         /*
 403         TWL_ADJUSTABLE_LDO(VPLL1, 0x2f, RES_VPLL1),
 404         */
 405         TWL_ADJUSTABLE_LDO(VPLL2, 0x33, RES_VPLL2),
 406         TWL_ADJUSTABLE_LDO(VSIM, 0x37, RES_VSIM),
 407         TWL_ADJUSTABLE_LDO(VDAC, 0x3b, RES_VDAC),
 408         /*
 409         TWL_ADJUSTABLE_LDO(VINTANA1, 0x3f, RES_VINTANA1),
 410         TWL_ADJUSTABLE_LDO(VINTANA2, 0x43, RES_VINTANA1),
 411         TWL_ADJUSTABLE_LDO(VINTDIG, 0x47, RES_VINTDIG),
 412         TWL_SMPS(VIO, 0x4b, RES_VIO),
 413         TWL_SMPS(VDD1, 0x55, RES_VDD1),
 414         TWL_SMPS(VDD2, 0x63, RES_VDD2),
 415          */
 416         TWL_FIXED_LDO(VUSB1V5, 0x71, 1500, RES_VUSB_1V5),
 417         TWL_FIXED_LDO(VUSB1V8, 0x74, 1800, RES_VUSB_1V8),
 418         TWL_FIXED_LDO(VUSB3V1, 0x77, 3100, RES_VUSB_3V1),
 419         /* VUSBCP is managed *only* by the USB subchip */
 420 };
 421
 422 static int twl4030reg_probe(struct platform_device *pdev)
 423 {
 424         int                             i;
 425         struct twlreg_info              *info;
 426         struct regulator_init_data      *initdata;
 427         struct regulation_constraints   *c;
 428         struct regulator_dev            *rdev;
 429
 430         for (i = 0, info = NULL; i < ARRAY_SIZE(twl4030_regs); i++) {
 431                 if (twl4030_regs[i].desc.id != pdev->id)
 432                         continue;
 433                 info = twl4030_regs + i;
 434                 break;
 435         }
 436         if (!info)
 437                 return -ENODEV;
 438
 439         initdata = pdev->dev.platform_data;
 440         if (!initdata)
 441                 return -EINVAL;
 442
 443         /* Constrain board-specific capabilities according to what
 444          * this driver and the chip itself can actually do.
 445          * (Regulator core now does this for voltage constraints.)
 446          */
 447         c = &initdata->constraints;
 448         c->valid_modes_mask &= REGULATOR_MODE_NORMAL | REGULATOR_MODE_STANDBY;
 449         c->valid_ops_mask &= REGULATOR_CHANGE_VOLTAGE
 450                                 | REGULATOR_CHANGE_MODE
 451                                 | REGULATOR_CHANGE_STATUS;
 452
 453         rdev = regulator_register(&info->desc, &pdev->dev, info);
 454         if (IS_ERR(rdev)) {
 455                 dev_err(&pdev->dev, "can't register %s, %ld\n",
 456                                 info->desc.name, PTR_ERR(rdev));
 457                 return PTR_ERR(rdev);
 458         }
 459         platform_set_drvdata(pdev, rdev);
 460
 461         /* NOTE:  many regulators support short-circuit IRQs (presentable
 462          * as REGULATOR_OVER_CURRENT notifications?) configured via:
 463          *  - SC_CONFIG
 464          *  - SC_DETECT1 (vintana2, vmmc1/2, vaux1/2/3/4)
 465          *  - SC_DETECT2 (vusb, vdac, vio, vdd1/2, vpll2)
 466          *  - IT_CONFIG
 467          */
 468
 469         return 0;
 470 }
 471
 472 static int __devexit twl4030reg_remove(struct platform_device *pdev)
 473 {
 474         regulator_unregister(platform_get_drvdata(pdev));
 475         return 0;
 476 }
 477
 478 MODULE_ALIAS("platform:twl4030_reg");
 479
 480 static struct platform_driver twl4030reg_driver = {
 481         .probe          = twl4030reg_probe,
 482         .remove         = __devexit_p(twl4030reg_remove),
 483         /* NOTE: short name, to work around driver model truncation of
 484          * "twl4030_regulator.12" (and friends) to "twl4030_regulator.1".
 485          */
 486         .driver.name    = "twl4030_reg",
 487         .driver.owner   = THIS_MODULE,
 488 };
 489
 490 static int __init twl4030reg_init(void)
 491 {
 492         return platform_driver_register(&twl4030reg_driver);
 493 }
 494 subsys_initcall(twl4030reg_init);
 495
 496 static void __exit twl4030reg_exit(void)
 497 {
 498         platform_driver_unregister(&twl4030reg_driver);
 499 }
 500 module_exit(twl4030reg_exit)
 501
 502 MODULE_DESCRIPTION("TWL4030 regulator driver");
 503 MODULE_LICENSE("GPL");