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 activate_bit; 74 }; 75 76 struct da9052_regulator { 77 struct da9052 *da9052; 78 struct da9052_regulator_info *info; 79 struct regulator_dev *rdev; 80 }; 81 82 static int verify_range(struct da9052_regulator_info *info, 83 int min_uV, int max_uV) 84 { 85 if (min_uV > info->max_uV || max_uV < info->min_uV) 86 return -EINVAL; 87 88 return 0; 89 } 90 91 static int da9052_dcdc_get_current_limit(struct regulator_dev *rdev) 92 { 93 struct da9052_regulator *regulator = rdev_get_drvdata(rdev); 94 int offset = rdev_get_id(rdev); 95 int ret, row = 2; 96 97 ret = da9052_reg_read(regulator->da9052, DA9052_BUCKA_REG + offset/2); 98 if (ret < 0) 99 return ret; 100 101 /* Determine the even or odd position of the buck current limit 102 * register field 103 */ 104 if (offset % 2 == 0) 105 ret = (ret & DA9052_BUCK_ILIM_MASK_EVEN) >> 2; 106 else 107 ret = (ret & DA9052_BUCK_ILIM_MASK_ODD) >> 6; 108 109 /* Select the appropriate current limit range */ 110 if (regulator->da9052->chip_id == DA9052) 111 row = 0; 112 else if (offset == 0) 113 row = 1; 114 115 return da9052_current_limits[row][ret]; 116 } 117 118 static int da9052_dcdc_set_current_limit(struct regulator_dev *rdev, int min_uA, 119 int max_uA) 120 { 121 struct da9052_regulator *regulator = rdev_get_drvdata(rdev); 122 int offset = rdev_get_id(rdev); 123 int reg_val = 0; 124 int i, row = 2; 125 126 /* Select the appropriate current limit range */ 127 if (regulator->da9052->chip_id == DA9052) 128 row = 0; 129 else if (offset == 0) 130 row = 1; 131 132 for (i = DA9052_CURRENT_RANGE - 1; i >= 0; i--) { 133 if ((min_uA <= da9052_current_limits[row][i]) && 134 (da9052_current_limits[row][i] <= max_uA)) { 135 reg_val = i; 136 break; 137 } 138 } 139 140 if (i < 0) 141 return -EINVAL; 142 143 /* Determine the even or odd position of the buck current limit 144 * register field 145 */ 146 if (offset % 2 == 0) 147 return da9052_reg_update(regulator->da9052, 148 DA9052_BUCKA_REG + offset/2, 149 DA9052_BUCK_ILIM_MASK_EVEN, 150 reg_val << 2); 151 else 152 return da9052_reg_update(regulator->da9052, 153 DA9052_BUCKA_REG + offset/2, 154 DA9052_BUCK_ILIM_MASK_ODD, 155 reg_val << 6); 156 } 157 158 static int da9052_list_voltage(struct regulator_dev *rdev, 159 unsigned int selector) 160 { 161 struct da9052_regulator *regulator = rdev_get_drvdata(rdev); 162 struct da9052_regulator_info *info = regulator->info; 163 int id = rdev_get_id(rdev); 164 int volt_uV; 165 166 if ((id == DA9052_ID_BUCK4) && (regulator->da9052->chip_id == DA9052) 167 && (selector >= DA9052_BUCK_PERI_REG_MAP_UPTO_3uV)) { 168 volt_uV = ((DA9052_BUCK_PERI_REG_MAP_UPTO_3uV * info->step_uV) 169 + info->min_uV); 170 volt_uV += (selector - DA9052_BUCK_PERI_REG_MAP_UPTO_3uV) 171 * (DA9052_BUCK_PERI_3uV_STEP); 172 } else { 173 volt_uV = (selector * info->step_uV) + info->min_uV; 174 } 175 176 if (volt_uV > info->max_uV) 177 return -EINVAL; 178 179 return volt_uV; 180 } 181 182 static int da9052_map_voltage(struct regulator_dev *rdev, 183 int min_uV, int max_uV) 184 { 185 struct da9052_regulator *regulator = rdev_get_drvdata(rdev); 186 struct da9052_regulator_info *info = regulator->info; 187 int id = rdev_get_id(rdev); 188 int ret, sel; 189 190 ret = verify_range(info, min_uV, max_uV); 191 if (ret < 0) 192 return ret; 193 194 if (min_uV < info->min_uV) 195 min_uV = info->min_uV; 196 197 if ((id == DA9052_ID_BUCK4) && (regulator->da9052->chip_id == DA9052) 198 && (min_uV >= DA9052_CONST_3uV)) { 199 sel = DA9052_BUCK_PERI_REG_MAP_UPTO_3uV + 200 DIV_ROUND_UP(min_uV - DA9052_CONST_3uV, 201 DA9052_BUCK_PERI_3uV_STEP); 202 } else { 203 sel = DIV_ROUND_UP(min_uV - info->min_uV, info->step_uV); 204 } 205 206 ret = da9052_list_voltage(rdev, sel); 207 if (ret < 0) 208 return ret; 209 210 return sel; 211 } 212 213 static int da9052_regulator_set_voltage_sel(struct regulator_dev *rdev, 214 unsigned int selector) 215 { 216 struct da9052_regulator *regulator = rdev_get_drvdata(rdev); 217 struct da9052_regulator_info *info = regulator->info; 218 int id = rdev_get_id(rdev); 219 int ret; 220 221 ret = da9052_reg_update(regulator->da9052, rdev->desc->vsel_reg, 222 rdev->desc->vsel_mask, selector); 223 if (ret < 0) 224 return ret; 225 226 /* Some LDOs and DCDCs are DVC controlled which requires enabling of 227 * the activate bit to implment the changes on the output. 228 */ 229 switch (id) { 230 case DA9052_ID_BUCK1: 231 case DA9052_ID_BUCK2: 232 case DA9052_ID_BUCK3: 233 case DA9052_ID_LDO2: 234 case DA9052_ID_LDO3: 235 ret = da9052_reg_update(regulator->da9052, DA9052_SUPPLY_REG, 236 info->activate_bit, info->activate_bit); 237 break; 238 } 239 240 return ret; 241 } 242 243 static struct regulator_ops da9052_dcdc_ops = { 244 .get_current_limit = da9052_dcdc_get_current_limit, 245 .set_current_limit = da9052_dcdc_set_current_limit, 246 247 .list_voltage = da9052_list_voltage, 248 .map_voltage = da9052_map_voltage, 249 .get_voltage_sel = regulator_get_voltage_sel_regmap, 250 .set_voltage_sel = da9052_regulator_set_voltage_sel, 251 .is_enabled = regulator_is_enabled_regmap, 252 .enable = regulator_enable_regmap, 253 .disable = regulator_disable_regmap, 254 }; 255 256 static struct regulator_ops da9052_ldo_ops = { 257 .list_voltage = da9052_list_voltage, 258 .map_voltage = da9052_map_voltage, 259 .get_voltage_sel = regulator_get_voltage_sel_regmap, 260 .set_voltage_sel = da9052_regulator_set_voltage_sel, 261 .is_enabled = regulator_is_enabled_regmap, 262 .enable = regulator_enable_regmap, 263 .disable = regulator_disable_regmap, 264 }; 265 266 #define DA9052_LDO(_id, step, min, max, sbits, ebits, abits) \ 267 {\ 268 .reg_desc = {\ 269 .name = #_id,\ 270 .ops = &da9052_ldo_ops,\ 271 .type = REGULATOR_VOLTAGE,\ 272 .id = DA9052_ID_##_id,\ 273 .n_voltages = (max - min) / step + 1, \ 274 .owner = THIS_MODULE,\ 275 .vsel_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \ 276 .vsel_mask = (1 << (sbits)) - 1,\ 277 .enable_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \ 278 .enable_mask = 1 << (ebits),\ 279 },\ 280 .min_uV = (min) * 1000,\ 281 .max_uV = (max) * 1000,\ 282 .step_uV = (step) * 1000,\ 283 .activate_bit = (abits),\ 284 } 285 286 #define DA9052_DCDC(_id, step, min, max, sbits, ebits, abits) \ 287 {\ 288 .reg_desc = {\ 289 .name = #_id,\ 290 .ops = &da9052_dcdc_ops,\ 291 .type = REGULATOR_VOLTAGE,\ 292 .id = DA9052_ID_##_id,\ 293 .n_voltages = (max - min) / step + 1, \ 294 .owner = THIS_MODULE,\ 295 .vsel_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \ 296 .vsel_mask = (1 << (sbits)) - 1,\ 297 .enable_reg = DA9052_BUCKCORE_REG + DA9052_ID_##_id, \ 298 .enable_mask = 1 << (ebits),\ 299 },\ 300 .min_uV = (min) * 1000,\ 301 .max_uV = (max) * 1000,\ 302 .step_uV = (step) * 1000,\ 303 .activate_bit = (abits),\ 304 } 305 306 static struct da9052_regulator_info da9052_regulator_info[] = { 307 DA9052_DCDC(BUCK1, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBCOREGO), 308 DA9052_DCDC(BUCK2, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBPROGO), 309 DA9052_DCDC(BUCK3, 25, 925, 2500, 6, 6, DA9052_SUPPLY_VBMEMGO), 310 DA9052_DCDC(BUCK4, 50, 1800, 3600, 5, 6, 0), 311 DA9052_LDO(LDO1, 50, 600, 1800, 5, 6, 0), 312 DA9052_LDO(LDO2, 25, 600, 1800, 6, 6, DA9052_SUPPLY_VLDO2GO), 313 DA9052_LDO(LDO3, 25, 1725, 3300, 6, 6, DA9052_SUPPLY_VLDO3GO), 314 DA9052_LDO(LDO4, 25, 1725, 3300, 6, 6, 0), 315 DA9052_LDO(LDO5, 50, 1200, 3600, 6, 6, 0), 316 DA9052_LDO(LDO6, 50, 1200, 3600, 6, 6, 0), 317 DA9052_LDO(LDO7, 50, 1200, 3600, 6, 6, 0), 318 DA9052_LDO(LDO8, 50, 1200, 3600, 6, 6, 0), 319 DA9052_LDO(LDO9, 50, 1250, 3650, 6, 6, 0), 320 DA9052_LDO(LDO10, 50, 1200, 3600, 6, 6, 0), 321 }; 322 323 static struct da9052_regulator_info da9053_regulator_info[] = { 324 DA9052_DCDC(BUCK1, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBCOREGO), 325 DA9052_DCDC(BUCK2, 25, 500, 2075, 6, 6, DA9052_SUPPLY_VBPROGO), 326 DA9052_DCDC(BUCK3, 25, 925, 2500, 6, 6, DA9052_SUPPLY_VBMEMGO), 327 DA9052_DCDC(BUCK4, 25, 925, 2500, 6, 6, 0), 328 DA9052_LDO(LDO1, 50, 600, 1800, 5, 6, 0), 329 DA9052_LDO(LDO2, 25, 600, 1800, 6, 6, DA9052_SUPPLY_VLDO2GO), 330 DA9052_LDO(LDO3, 25, 1725, 3300, 6, 6, DA9052_SUPPLY_VLDO3GO), 331 DA9052_LDO(LDO4, 25, 1725, 3300, 6, 6, 0), 332 DA9052_LDO(LDO5, 50, 1200, 3600, 6, 6, 0), 333 DA9052_LDO(LDO6, 50, 1200, 3600, 6, 6, 0), 334 DA9052_LDO(LDO7, 50, 1200, 3600, 6, 6, 0), 335 DA9052_LDO(LDO8, 50, 1200, 3600, 6, 6, 0), 336 DA9052_LDO(LDO9, 50, 1250, 3650, 6, 6, 0), 337 DA9052_LDO(LDO10, 50, 1200, 3600, 6, 6, 0), 338 }; 339 340 static inline struct da9052_regulator_info *find_regulator_info(u8 chip_id, 341 int id) 342 { 343 struct da9052_regulator_info *info; 344 int i; 345 346 switch (chip_id) { 347 case DA9052: 348 for (i = 0; i < ARRAY_SIZE(da9052_regulator_info); i++) { 349 info = &da9052_regulator_info[i]; 350 if (info->reg_desc.id == id) 351 return info; 352 } 353 break; 354 case DA9053_AA: 355 case DA9053_BA: 356 case DA9053_BB: 357 for (i = 0; i < ARRAY_SIZE(da9053_regulator_info); i++) { 358 info = &da9053_regulator_info[i]; 359 if (info->reg_desc.id == id) 360 return info; 361 } 362 break; 363 } 364 365 return NULL; 366 } 367 368 static int da9052_regulator_probe(struct platform_device *pdev) 369 { 370 struct regulator_config config = { }; 371 struct da9052_regulator *regulator; 372 struct da9052 *da9052; 373 struct da9052_pdata *pdata; 374 375 regulator = devm_kzalloc(&pdev->dev, sizeof(struct da9052_regulator), 376 GFP_KERNEL); 377 if (!regulator) 378 return -ENOMEM; 379 380 da9052 = dev_get_drvdata(pdev->dev.parent); 381 pdata = da9052->dev->platform_data; 382 regulator->da9052 = da9052; 383 384 regulator->info = find_regulator_info(regulator->da9052->chip_id, 385 pdev->id); 386 if (regulator->info == NULL) { 387 dev_err(&pdev->dev, "invalid regulator ID specified\n"); 388 return -EINVAL; 389 } 390 391 config.dev = &pdev->dev; 392 config.driver_data = regulator; 393 config.regmap = da9052->regmap; 394 if (pdata && pdata->regulators) { 395 config.init_data = pdata->regulators[pdev->id]; 396 } else { 397 #ifdef CONFIG_OF 398 struct device_node *nproot = da9052->dev->of_node; 399 struct device_node *np; 400 401 if (!nproot) 402 return -ENODEV; 403 404 nproot = of_find_node_by_name(nproot, "regulators"); 405 if (!nproot) 406 return -ENODEV; 407 408 for_each_child_of_node(nproot, np) { 409 if (!of_node_cmp(np->name, 410 regulator->info->reg_desc.name)) { 411 config.init_data = of_get_regulator_init_data( 412 &pdev->dev, np); 413 config.of_node = np; 414 break; 415 } 416 } 417 #endif 418 } 419 420 regulator->rdev = regulator_register(®ulator->info->reg_desc, 421 &config); 422 if (IS_ERR(regulator->rdev)) { 423 dev_err(&pdev->dev, "failed to register regulator %s\n", 424 regulator->info->reg_desc.name); 425 return PTR_ERR(regulator->rdev); 426 } 427 428 platform_set_drvdata(pdev, regulator); 429 430 return 0; 431 } 432 433 static int da9052_regulator_remove(struct platform_device *pdev) 434 { 435 struct da9052_regulator *regulator = platform_get_drvdata(pdev); 436 437 regulator_unregister(regulator->rdev); 438 return 0; 439 } 440 441 static struct platform_driver da9052_regulator_driver = { 442 .probe = da9052_regulator_probe, 443 .remove = da9052_regulator_remove, 444 .driver = { 445 .name = "da9052-regulator", 446 .owner = THIS_MODULE, 447 }, 448 }; 449 450 static int __init da9052_regulator_init(void) 451 { 452 return platform_driver_register(&da9052_regulator_driver); 453 } 454 subsys_initcall(da9052_regulator_init); 455 456 static void __exit da9052_regulator_exit(void) 457 { 458 platform_driver_unregister(&da9052_regulator_driver); 459 } 460 module_exit(da9052_regulator_exit); 461 462 MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>"); 463 MODULE_DESCRIPTION("Power Regulator driver for Dialog DA9052 PMIC"); 464 MODULE_LICENSE("GPL"); 465 MODULE_ALIAS("platform:da9052-regulator"); 466