1 /* 2 * da9052-regulator.c: Regulator driver for DA9052 3 * 4 * Copyright(c) 2011 Dialog Semiconductor Ltd. 5 * 6 * Author: David Dajun Chen <dchen@diasemi.com> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 * 13 */ 14 15 #include <linux/module.h> 16 #include <linux/moduleparam.h> 17 #include <linux/init.h> 18 #include <linux/err.h> 19 #include <linux/platform_device.h> 20 #include <linux/regulator/driver.h> 21 #include <linux/regulator/machine.h> 22 #ifdef CONFIG_OF 23 #include <linux/of.h> 24 #include <linux/regulator/of_regulator.h> 25 #endif 26 27 #include <linux/mfd/da9052/da9052.h> 28 #include <linux/mfd/da9052/reg.h> 29 #include <linux/mfd/da9052/pdata.h> 30 31 /* Buck step size */ 32 #define DA9052_BUCK_PERI_3uV_STEP 100000 33 #define DA9052_BUCK_PERI_REG_MAP_UPTO_3uV 24 34 #define DA9052_CONST_3uV 3000000 35 36 #define DA9052_MIN_UA 0 37 #define DA9052_MAX_UA 3 38 #define DA9052_CURRENT_RANGE 4 39 40 /* Bit masks */ 41 #define DA9052_BUCK_ILIM_MASK_EVEN 0x0c 42 #define DA9052_BUCK_ILIM_MASK_ODD 0xc0 43 44 /* DA9052 REGULATOR IDs */ 45 #define DA9052_ID_BUCK1 0 46 #define DA9052_ID_BUCK2 1 47 #define DA9052_ID_BUCK3 2 48 #define DA9052_ID_BUCK4 3 49 #define DA9052_ID_LDO1 4 50 #define DA9052_ID_LDO2 5 51 #define DA9052_ID_LDO3 6 52 #define DA9052_ID_LDO4 7 53 #define DA9052_ID_LDO5 8 54 #define DA9052_ID_LDO6 9 55 #define DA9052_ID_LDO7 10 56 #define DA9052_ID_LDO8 11 57 #define DA9052_ID_LDO9 12 58 #define DA9052_ID_LDO10 13 59 60 static const u32 da9052_current_limits[3][4] = { 61 {700000, 800000, 1000000, 1200000}, /* DA9052-BC BUCKs */ 62 {1600000, 2000000, 2400000, 3000000}, /* DA9053-AA/Bx BUCK-CORE */ 63 {800000, 1000000, 1200000, 1500000}, /* DA9053-AA/Bx BUCK-PRO, 64 * BUCK-MEM and BUCK-PERI 65 */ 66 }; 67 68 struct da9052_regulator_info { 69 struct regulator_desc reg_desc; 70 int step_uV; 71 int min_uV; 72 int max_uV; 73 unsigned char volt_shift; 74 unsigned char en_bit; 75 unsigned char activate_bit; 76 }; 77 78 struct da9052_regulator { 79 struct da9052 *da9052; 80 struct da9052_regulator_info *info; 81 struct regulator_dev *rdev; 82 }; 83 84 static int verify_range(struct da9052_regulator_info *info, 85 int min_uV, int max_uV) 86 { 87 if (min_uV > info->max_uV || max_uV < info->min_uV) 88 return -EINVAL; 89 90 return 0; 91 } 92 93 static int da9052_regulator_enable(struct regulator_dev *rdev) 94 { 95 struct da9052_regulator *regulator = rdev_get_drvdata(rdev); 96 struct da9052_regulator_info *info = regulator->info; 97 int offset = rdev_get_id(rdev); 98 99 return da9052_reg_update(regulator->da9052, 100 DA9052_BUCKCORE_REG + offset, 101 1 << info->en_bit, 1 << info->en_bit); 102 } 103 104 static int da9052_regulator_disable(struct regulator_dev *rdev) 105 { 106 struct da9052_regulator *regulator = rdev_get_drvdata(rdev); 107 struct da9052_regulator_info *info = regulator->info; 108 int offset = rdev_get_id(rdev); 109 110 return da9052_reg_update(regulator->da9052, 111 DA9052_BUCKCORE_REG + offset, 112 1 << info->en_bit, 0); 113 } 114 115 static int da9052_regulator_is_enabled(struct regulator_dev *rdev) 116 { 117 struct da9052_regulator *regulator = rdev_get_drvdata(rdev); 118 struct da9052_regulator_info *info = regulator->info; 119 int offset = rdev_get_id(rdev); 120 int ret; 121 122 ret = da9052_reg_read(regulator->da9052, DA9052_BUCKCORE_REG + offset); 123 if (ret < 0) 124 return ret; 125 126 return ret & (1 << info->en_bit); 127 } 128 129 static int da9052_dcdc_get_current_limit(struct regulator_dev *rdev) 130 { 131 struct da9052_regulator *regulator = rdev_get_drvdata(rdev); 132 int offset = rdev_get_id(rdev); 133 int ret, row = 2; 134 135 ret = da9052_reg_read(regulator->da9052, DA9052_BUCKA_REG + offset/2); 136 if (ret < 0) 137 return ret; 138 139 /* Determine the even or odd position of the buck current limit 140 * register field 141 */ 142 if (offset % 2 == 0) 143 ret = (ret & DA9052_BUCK_ILIM_MASK_EVEN) >> 2; 144 else 145 ret = (ret & DA9052_BUCK_ILIM_MASK_ODD) >> 6; 146 147 /* Select the appropriate current limit range */ 148 if (regulator->da9052->chip_id == DA9052) 149 row = 0; 150 else if (offset == 0) 151 row = 1; 152 153 return da9052_current_limits[row][ret]; 154 } 155 156 static int da9052_dcdc_set_current_limit(struct regulator_dev *rdev, int min_uA, 157 int max_uA) 158 { 159 struct da9052_regulator *regulator = rdev_get_drvdata(rdev); 160 int offset = rdev_get_id(rdev); 161 int reg_val = 0; 162 int i, row = 2; 163 164 /* Select the appropriate current limit range */ 165 if (regulator->da9052->chip_id == DA9052) 166 row = 0; 167 else if (offset == 0) 168 row = 1; 169 170 if (min_uA > da9052_current_limits[row][DA9052_MAX_UA] || 171 max_uA < da9052_current_limits[row][DA9052_MIN_UA]) 172 return -EINVAL; 173 174 for (i = 0; i < DA9052_CURRENT_RANGE; i++) { 175 if (min_uA <= da9052_current_limits[row][i]) { 176 reg_val = i; 177 break; 178 } 179 } 180 181 /* Determine the even or odd position of the buck current limit 182 * register field 183 */ 184 if (offset % 2 == 0) 185 return da9052_reg_update(regulator->da9052, 186 DA9052_BUCKA_REG + offset/2, 187 DA9052_BUCK_ILIM_MASK_EVEN, 188 reg_val << 2); 189 else 190 return da9052_reg_update(regulator->da9052, 191 DA9052_BUCKA_REG + offset/2, 192 DA9052_BUCK_ILIM_MASK_ODD, 193 reg_val << 6); 194 } 195 196 static int da9052_list_voltage(struct regulator_dev *rdev, 197 unsigned int selector) 198 { 199 struct da9052_regulator *regulator = rdev_get_drvdata(rdev); 200 struct da9052_regulator_info *info = regulator->info; 201 int id = rdev_get_id(rdev); 202 int volt_uV; 203 204 if ((id == DA9052_ID_BUCK4) && (regulator->da9052->chip_id == DA9052) 205 && (selector >= DA9052_BUCK_PERI_REG_MAP_UPTO_3uV)) { 206 volt_uV = ((DA9052_BUCK_PERI_REG_MAP_UPTO_3uV * info->step_uV) 207 + info->min_uV); 208 volt_uV += (selector - DA9052_BUCK_PERI_REG_MAP_UPTO_3uV) 209 * (DA9052_BUCK_PERI_3uV_STEP); 210 } else { 211 volt_uV = (selector * info->step_uV) + info->min_uV; 212 } 213 214 if (volt_uV > info->max_uV) 215 return -EINVAL; 216 217 return volt_uV; 218 } 219 220 static int da9052_regulator_set_voltage(struct regulator_dev *rdev, 221 int min_uV, int max_uV, 222 unsigned int *selector) 223 { 224 struct da9052_regulator *regulator = rdev_get_drvdata(rdev); 225 struct da9052_regulator_info *info = regulator->info; 226 int id = rdev_get_id(rdev); 227 int ret; 228 229 ret = verify_range(info, min_uV, max_uV); 230 if (ret < 0) 231 return ret; 232 233 if (min_uV < info->min_uV) 234 min_uV = info->min_uV; 235 236 if ((id == DA9052_ID_BUCK4) && (regulator->da9052->chip_id == DA9052) 237 && (min_uV >= DA9052_CONST_3uV)) { 238 *selector = DA9052_BUCK_PERI_REG_MAP_UPTO_3uV + 239 DIV_ROUND_UP(min_uV - DA9052_CONST_3uV, 240 DA9052_BUCK_PERI_3uV_STEP); 241 } else { 242 *selector = DIV_ROUND_UP(min_uV - info->min_uV, info->step_uV); 243 } 244 245 ret = da9052_list_voltage(rdev, *selector); 246 if (ret < 0) 247 return ret; 248 249 ret = da9052_reg_update(regulator->da9052, 250 DA9052_BUCKCORE_REG + id, 251 (1 << info->volt_shift) - 1, *selector); 252 if (ret < 0) 253 return ret; 254 255 /* Some LDOs and DCDCs are DVC controlled which requires enabling of 256 * the activate bit to implment the changes on the output. 257 */ 258 switch (id) { 259 case DA9052_ID_BUCK1: 260 case DA9052_ID_BUCK2: 261 case DA9052_ID_BUCK3: 262 case DA9052_ID_LDO2: 263 case DA9052_ID_LDO3: 264 ret = da9052_reg_update(regulator->da9052, DA9052_SUPPLY_REG, 265 info->activate_bit, info->activate_bit); 266 break; 267 } 268 269 return ret; 270 } 271 272 static int da9052_get_regulator_voltage_sel(struct regulator_dev *rdev) 273 { 274 struct da9052_regulator *regulator = rdev_get_drvdata(rdev); 275 struct da9052_regulator_info *info = regulator->info; 276 int offset = rdev_get_id(rdev); 277 int ret; 278 279 ret = da9052_reg_read(regulator->da9052, DA9052_BUCKCORE_REG + offset); 280 if (ret < 0) 281 return ret; 282 283 ret &= ((1 << info->volt_shift) - 1); 284 285 return ret; 286 } 287 288 static struct regulator_ops da9052_dcdc_ops = { 289 .set_voltage = da9052_regulator_set_voltage, 290 .get_current_limit = da9052_dcdc_get_current_limit, 291 .set_current_limit = da9052_dcdc_set_current_limit, 292 293 .list_voltage = da9052_list_voltage, 294 .get_voltage_sel = da9052_get_regulator_voltage_sel, 295 .is_enabled = da9052_regulator_is_enabled, 296 .enable = da9052_regulator_enable, 297 .disable = da9052_regulator_disable, 298 }; 299 300 static struct regulator_ops da9052_ldo_ops = { 301 .set_voltage = da9052_regulator_set_voltage, 302 303 .list_voltage = da9052_list_voltage, 304 .get_voltage_sel = da9052_get_regulator_voltage_sel, 305 .is_enabled = da9052_regulator_is_enabled, 306 .enable = da9052_regulator_enable, 307 .disable = da9052_regulator_disable, 308 }; 309 310 #define DA9052_LDO(_id, step, min, max, sbits, ebits, abits) \ 311 {\ 312 .reg_desc = {\ 313 .name = #_id,\ 314 .ops = &da9052_ldo_ops,\ 315 .type = REGULATOR_VOLTAGE,\ 316 .id = DA9052_ID_##_id,\ 317 .n_voltages = (max - min) / step + 1, \ 318 .owner = THIS_MODULE,\ 319 },\ 320 .min_uV = (min) * 1000,\ 321 .max_uV = (max) * 1000,\ 322 .step_uV = (step) * 1000,\ 323 .volt_shift = (sbits),\ 324 .en_bit = (ebits),\ 325 .activate_bit = (abits),\ 326 } 327 328 #define DA9052_DCDC(_id, step, min, max, sbits, ebits, abits) \ 329 {\ 330 .reg_desc = {\ 331 .name = #_id,\ 332 .ops = &da9052_dcdc_ops,\ 333 .type = REGULATOR_VOLTAGE,\ 334 .id = DA9052_ID_##_id,\ 335 .n_voltages = (max - min) / step + 1, \ 336 .owner = THIS_MODULE,\ 337 },\ 338 .min_uV = (min) * 1000,\ 339 .max_uV = (max) * 1000,\ 340 .step_uV = (step) * 1000,\ 341 .volt_shift = (sbits),\ 342 .en_bit = (ebits),\ 343 .activate_bit = (abits),\ 344 } 345 346 static struct da9052_regulator_info da9052_regulator_info[] = { 347 DA9052_DCDC(BUCK1, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBCOREGO), 348 DA9052_DCDC(BUCK2, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBPROGO), 349 DA9052_DCDC(BUCK3, 25, 925, 2500, 6, 6, DA9052_SUPPLY_VBMEMGO), 350 DA9052_DCDC(BUCK4, 50, 1800, 3600, 5, 6, 0), 351 DA9052_LDO(LDO1, 50, 600, 1800, 5, 6, 0), 352 DA9052_LDO(LDO2, 25, 600, 1800, 6, 6, DA9052_SUPPLY_VLDO2GO), 353 DA9052_LDO(LDO3, 25, 1725, 3300, 6, 6, DA9052_SUPPLY_VLDO3GO), 354 DA9052_LDO(LDO4, 25, 1725, 3300, 6, 6, 0), 355 DA9052_LDO(LDO5, 50, 1200, 3600, 6, 6, 0), 356 DA9052_LDO(LDO6, 50, 1200, 3600, 6, 6, 0), 357 DA9052_LDO(LDO7, 50, 1200, 3600, 6, 6, 0), 358 DA9052_LDO(LDO8, 50, 1200, 3600, 6, 6, 0), 359 DA9052_LDO(LDO9, 50, 1250, 3650, 6, 6, 0), 360 DA9052_LDO(LDO10, 50, 1200, 3600, 6, 6, 0), 361 }; 362 363 static struct da9052_regulator_info da9053_regulator_info[] = { 364 DA9052_DCDC(BUCK1, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBCOREGO), 365 DA9052_DCDC(BUCK2, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBPROGO), 366 DA9052_DCDC(BUCK3, 25, 925, 2500, 6, 6, DA9052_SUPPLY_VBMEMGO), 367 DA9052_DCDC(BUCK4, 25, 925, 2500, 6, 6, 0), 368 DA9052_LDO(LDO1, 50, 600, 1800, 5, 6, 0), 369 DA9052_LDO(LDO2, 25, 600, 1800, 6, 6, DA9052_SUPPLY_VLDO2GO), 370 DA9052_LDO(LDO3, 25, 1725, 3300, 6, 6, DA9052_SUPPLY_VLDO3GO), 371 DA9052_LDO(LDO4, 25, 1725, 3300, 6, 6, 0), 372 DA9052_LDO(LDO5, 50, 1200, 3600, 6, 6, 0), 373 DA9052_LDO(LDO6, 50, 1200, 3600, 6, 6, 0), 374 DA9052_LDO(LDO7, 50, 1200, 3600, 6, 6, 0), 375 DA9052_LDO(LDO8, 50, 1200, 3600, 6, 6, 0), 376 DA9052_LDO(LDO9, 50, 1250, 3650, 6, 6, 0), 377 DA9052_LDO(LDO10, 50, 1200, 3600, 6, 6, 0), 378 }; 379 380 static inline struct da9052_regulator_info *find_regulator_info(u8 chip_id, 381 int id) 382 { 383 struct da9052_regulator_info *info; 384 int i; 385 386 switch (chip_id) { 387 case DA9052: 388 for (i = 0; i < ARRAY_SIZE(da9052_regulator_info); i++) { 389 info = &da9052_regulator_info[i]; 390 if (info->reg_desc.id == id) 391 return info; 392 } 393 break; 394 case DA9053_AA: 395 case DA9053_BA: 396 case DA9053_BB: 397 for (i = 0; i < ARRAY_SIZE(da9053_regulator_info); i++) { 398 info = &da9053_regulator_info[i]; 399 if (info->reg_desc.id == id) 400 return info; 401 } 402 break; 403 } 404 405 return NULL; 406 } 407 408 static int __devinit da9052_regulator_probe(struct platform_device *pdev) 409 { 410 struct regulator_config config = { }; 411 struct da9052_regulator *regulator; 412 struct da9052 *da9052; 413 struct da9052_pdata *pdata; 414 415 regulator = devm_kzalloc(&pdev->dev, sizeof(struct da9052_regulator), 416 GFP_KERNEL); 417 if (!regulator) 418 return -ENOMEM; 419 420 da9052 = dev_get_drvdata(pdev->dev.parent); 421 pdata = da9052->dev->platform_data; 422 regulator->da9052 = da9052; 423 424 regulator->info = find_regulator_info(regulator->da9052->chip_id, 425 pdev->id); 426 if (regulator->info == NULL) { 427 dev_err(&pdev->dev, "invalid regulator ID specified\n"); 428 return -EINVAL; 429 } 430 431 config.dev = &pdev->dev; 432 config.driver_data = regulator; 433 if (pdata && pdata->regulators) { 434 config.init_data = pdata->regulators[pdev->id]; 435 } else { 436 #ifdef CONFIG_OF 437 struct device_node *nproot = da9052->dev->of_node; 438 struct device_node *np; 439 440 if (!nproot) 441 return -ENODEV; 442 443 nproot = of_find_node_by_name(nproot, "regulators"); 444 if (!nproot) 445 return -ENODEV; 446 447 for (np = of_get_next_child(nproot, NULL); !np; 448 np = of_get_next_child(nproot, np)) { 449 if (!of_node_cmp(np->name, 450 regulator->info->reg_desc.name)) { 451 config.init_data = of_get_regulator_init_data( 452 &pdev->dev, np); 453 break; 454 } 455 } 456 #endif 457 } 458 459 regulator->rdev = regulator_register(®ulator->info->reg_desc, 460 &config); 461 if (IS_ERR(regulator->rdev)) { 462 dev_err(&pdev->dev, "failed to register regulator %s\n", 463 regulator->info->reg_desc.name); 464 return PTR_ERR(regulator->rdev); 465 } 466 467 platform_set_drvdata(pdev, regulator); 468 469 return 0; 470 } 471 472 static int __devexit da9052_regulator_remove(struct platform_device *pdev) 473 { 474 struct da9052_regulator *regulator = platform_get_drvdata(pdev); 475 476 regulator_unregister(regulator->rdev); 477 return 0; 478 } 479 480 static struct platform_driver da9052_regulator_driver = { 481 .probe = da9052_regulator_probe, 482 .remove = __devexit_p(da9052_regulator_remove), 483 .driver = { 484 .name = "da9052-regulator", 485 .owner = THIS_MODULE, 486 }, 487 }; 488 489 static int __init da9052_regulator_init(void) 490 { 491 return platform_driver_register(&da9052_regulator_driver); 492 } 493 subsys_initcall(da9052_regulator_init); 494 495 static void __exit da9052_regulator_exit(void) 496 { 497 platform_driver_unregister(&da9052_regulator_driver); 498 } 499 module_exit(da9052_regulator_exit); 500 501 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); 502 MODULE_DESCRIPTION("Power Regulator driver for Dialog DA9052 PMIC"); 503 MODULE_LICENSE("GPL"); 504 MODULE_ALIAS("platform:da9052-regulator"); 505