Sundar R IYER | c789ca2 | 2010-07-13 21:48:56 +0530 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) ST-Ericsson SA 2010 |
| 3 | * |
| 4 | * License Terms: GNU General Public License v2 |
| 5 | * |
| 6 | * Author: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson |
| 7 | * |
| 8 | * AB8500 peripheral regulators |
| 9 | * |
| 10 | * AB8500 supports the following regulators, |
| 11 | * LDOs - VAUDIO, VANAMIC2/2, VDIGMIC, VINTCORE12, VTVOUT, |
| 12 | * VAUX1/2/3, VANA |
| 13 | * |
| 14 | * for DB8500 cut 1.0 and previous versions of the silicon, all accesses |
| 15 | * to registers are through the DB8500 SPI. In cut 1.1 onwards, these |
| 16 | * accesses are through the DB8500 PRCMU I2C |
| 17 | * |
| 18 | */ |
| 19 | #include <linux/init.h> |
| 20 | #include <linux/kernel.h> |
| 21 | #include <linux/err.h> |
| 22 | #include <linux/platform_device.h> |
| 23 | #include <linux/mfd/ab8500.h> |
| 24 | #include <linux/regulator/driver.h> |
| 25 | #include <linux/regulator/machine.h> |
| 26 | #include <linux/regulator/ab8500.h> |
| 27 | |
| 28 | /** |
| 29 | * struct ab8500_regulator_info - ab8500 regulator information |
| 30 | * @desc: regulator description |
| 31 | * @ab8500: ab8500 parent |
| 32 | * @regulator_dev: regulator device |
| 33 | * @max_uV: maximum voltage (for variable voltage supplies) |
| 34 | * @min_uV: minimum voltage (for variable voltage supplies) |
| 35 | * @fixed_uV: typical voltage (for fixed voltage supplies) |
| 36 | * @update_reg: register to control on/off |
| 37 | * @mask: mask to enable/disable regulator |
| 38 | * @enable: bits to enable the regulator in normal(high power) mode |
| 39 | * @voltage_reg: register to control regulator voltage |
| 40 | * @voltage_mask: mask to control regulator voltage |
| 41 | * @supported_voltages: supported voltage table |
| 42 | * @voltages_len: number of supported voltages for the regulator |
| 43 | */ |
| 44 | struct ab8500_regulator_info { |
| 45 | struct device *dev; |
| 46 | struct regulator_desc desc; |
| 47 | struct ab8500 *ab8500; |
| 48 | struct regulator_dev *regulator; |
| 49 | int max_uV; |
| 50 | int min_uV; |
| 51 | int fixed_uV; |
| 52 | int update_reg; |
| 53 | int mask; |
| 54 | int enable; |
| 55 | int voltage_reg; |
| 56 | int voltage_mask; |
| 57 | int const *supported_voltages; |
| 58 | int voltages_len; |
| 59 | }; |
| 60 | |
| 61 | /* voltage tables for the vauxn/vintcore supplies */ |
| 62 | static const int ldo_vauxn_voltages[] = { |
| 63 | 1100000, |
| 64 | 1200000, |
| 65 | 1300000, |
| 66 | 1400000, |
| 67 | 1500000, |
| 68 | 1800000, |
| 69 | 1850000, |
| 70 | 1900000, |
| 71 | 2500000, |
| 72 | 2650000, |
| 73 | 2700000, |
| 74 | 2750000, |
| 75 | 2800000, |
| 76 | 2900000, |
| 77 | 3000000, |
| 78 | 3300000, |
| 79 | }; |
| 80 | |
| 81 | static const int ldo_vintcore_voltages[] = { |
| 82 | 1200000, |
| 83 | 1225000, |
| 84 | 1250000, |
| 85 | 1275000, |
| 86 | 1300000, |
| 87 | 1325000, |
| 88 | 1350000, |
| 89 | }; |
| 90 | |
| 91 | static int ab8500_regulator_enable(struct regulator_dev *rdev) |
| 92 | { |
| 93 | int regulator_id, ret; |
| 94 | struct ab8500_regulator_info *info = rdev_get_drvdata(rdev); |
| 95 | |
| 96 | regulator_id = rdev_get_id(rdev); |
| 97 | if (regulator_id >= AB8500_NUM_REGULATORS) |
| 98 | return -EINVAL; |
| 99 | |
| 100 | ret = ab8500_set_bits(info->ab8500, info->update_reg, |
| 101 | info->mask, info->enable); |
| 102 | if (ret < 0) |
| 103 | dev_err(rdev_get_dev(rdev), |
| 104 | "couldn't set enable bits for regulator\n"); |
| 105 | return ret; |
| 106 | } |
| 107 | |
| 108 | static int ab8500_regulator_disable(struct regulator_dev *rdev) |
| 109 | { |
| 110 | int regulator_id, ret; |
| 111 | struct ab8500_regulator_info *info = rdev_get_drvdata(rdev); |
| 112 | |
| 113 | regulator_id = rdev_get_id(rdev); |
| 114 | if (regulator_id >= AB8500_NUM_REGULATORS) |
| 115 | return -EINVAL; |
| 116 | |
| 117 | ret = ab8500_set_bits(info->ab8500, info->update_reg, |
| 118 | info->mask, 0x0); |
| 119 | if (ret < 0) |
| 120 | dev_err(rdev_get_dev(rdev), |
| 121 | "couldn't set disable bits for regulator\n"); |
| 122 | return ret; |
| 123 | } |
| 124 | |
| 125 | static int ab8500_regulator_is_enabled(struct regulator_dev *rdev) |
| 126 | { |
| 127 | int regulator_id, ret; |
| 128 | struct ab8500_regulator_info *info = rdev_get_drvdata(rdev); |
| 129 | |
| 130 | regulator_id = rdev_get_id(rdev); |
| 131 | if (regulator_id >= AB8500_NUM_REGULATORS) |
| 132 | return -EINVAL; |
| 133 | |
| 134 | ret = ab8500_read(info->ab8500, info->update_reg); |
| 135 | if (ret < 0) { |
| 136 | dev_err(rdev_get_dev(rdev), |
| 137 | "couldn't read 0x%x register\n", info->update_reg); |
| 138 | return ret; |
| 139 | } |
| 140 | |
| 141 | if (ret & info->mask) |
| 142 | return true; |
| 143 | else |
| 144 | return false; |
| 145 | } |
| 146 | |
| 147 | static int ab8500_list_voltage(struct regulator_dev *rdev, unsigned selector) |
| 148 | { |
| 149 | int regulator_id; |
| 150 | struct ab8500_regulator_info *info = rdev_get_drvdata(rdev); |
| 151 | |
| 152 | regulator_id = rdev_get_id(rdev); |
| 153 | if (regulator_id >= AB8500_NUM_REGULATORS) |
| 154 | return -EINVAL; |
| 155 | |
| 156 | /* return the uV for the fixed regulators */ |
| 157 | if (info->fixed_uV) |
| 158 | return info->fixed_uV; |
| 159 | |
Axel Lin | 49990e6 | 2010-09-04 23:06:41 +0800 | [diff] [blame] | 160 | if (selector >= info->voltages_len) |
Sundar R IYER | c789ca2 | 2010-07-13 21:48:56 +0530 | [diff] [blame] | 161 | return -EINVAL; |
| 162 | |
| 163 | return info->supported_voltages[selector]; |
| 164 | } |
| 165 | |
| 166 | static int ab8500_regulator_get_voltage(struct regulator_dev *rdev) |
| 167 | { |
| 168 | int regulator_id, ret, val; |
| 169 | struct ab8500_regulator_info *info = rdev_get_drvdata(rdev); |
| 170 | |
| 171 | regulator_id = rdev_get_id(rdev); |
| 172 | if (regulator_id >= AB8500_NUM_REGULATORS) |
| 173 | return -EINVAL; |
| 174 | |
| 175 | ret = ab8500_read(info->ab8500, info->voltage_reg); |
| 176 | if (ret < 0) { |
| 177 | dev_err(rdev_get_dev(rdev), |
| 178 | "couldn't read voltage reg for regulator\n"); |
| 179 | return ret; |
| 180 | } |
| 181 | |
| 182 | /* vintcore has a different layout */ |
| 183 | val = ret & info->voltage_mask; |
| 184 | if (regulator_id == AB8500_LDO_INTCORE) |
| 185 | ret = info->supported_voltages[val >> 0x3]; |
| 186 | else |
| 187 | ret = info->supported_voltages[val]; |
| 188 | |
| 189 | return ret; |
| 190 | } |
| 191 | |
| 192 | static int ab8500_get_best_voltage_index(struct regulator_dev *rdev, |
| 193 | int min_uV, int max_uV) |
| 194 | { |
| 195 | struct ab8500_regulator_info *info = rdev_get_drvdata(rdev); |
| 196 | int i; |
| 197 | |
| 198 | /* check the supported voltage */ |
| 199 | for (i = 0; i < info->voltages_len; i++) { |
| 200 | if ((info->supported_voltages[i] >= min_uV) && |
| 201 | (info->supported_voltages[i] <= max_uV)) |
| 202 | return i; |
| 203 | } |
| 204 | |
| 205 | return -EINVAL; |
| 206 | } |
| 207 | |
| 208 | static int ab8500_regulator_set_voltage(struct regulator_dev *rdev, |
| 209 | int min_uV, int max_uV) |
| 210 | { |
| 211 | int regulator_id, ret; |
| 212 | struct ab8500_regulator_info *info = rdev_get_drvdata(rdev); |
| 213 | |
| 214 | regulator_id = rdev_get_id(rdev); |
| 215 | if (regulator_id >= AB8500_NUM_REGULATORS) |
| 216 | return -EINVAL; |
| 217 | |
| 218 | /* get the appropriate voltages within the range */ |
| 219 | ret = ab8500_get_best_voltage_index(rdev, min_uV, max_uV); |
| 220 | if (ret < 0) { |
| 221 | dev_err(rdev_get_dev(rdev), |
| 222 | "couldn't get best voltage for regulator\n"); |
| 223 | return ret; |
| 224 | } |
| 225 | |
| 226 | /* set the registers for the request */ |
| 227 | ret = ab8500_set_bits(info->ab8500, info->voltage_reg, |
| 228 | info->voltage_mask, ret); |
| 229 | if (ret < 0) |
| 230 | dev_err(rdev_get_dev(rdev), |
| 231 | "couldn't set voltage reg for regulator\n"); |
| 232 | |
| 233 | return ret; |
| 234 | } |
| 235 | |
| 236 | static struct regulator_ops ab8500_regulator_ops = { |
| 237 | .enable = ab8500_regulator_enable, |
| 238 | .disable = ab8500_regulator_disable, |
| 239 | .is_enabled = ab8500_regulator_is_enabled, |
| 240 | .get_voltage = ab8500_regulator_get_voltage, |
| 241 | .set_voltage = ab8500_regulator_set_voltage, |
| 242 | .list_voltage = ab8500_list_voltage, |
| 243 | }; |
| 244 | |
| 245 | static int ab8500_fixed_get_voltage(struct regulator_dev *rdev) |
| 246 | { |
| 247 | int regulator_id; |
| 248 | struct ab8500_regulator_info *info = rdev_get_drvdata(rdev); |
| 249 | |
| 250 | regulator_id = rdev_get_id(rdev); |
| 251 | if (regulator_id >= AB8500_NUM_REGULATORS) |
| 252 | return -EINVAL; |
| 253 | |
| 254 | return info->fixed_uV; |
| 255 | } |
| 256 | |
| 257 | static struct regulator_ops ab8500_ldo_fixed_ops = { |
| 258 | .enable = ab8500_regulator_enable, |
| 259 | .disable = ab8500_regulator_disable, |
| 260 | .is_enabled = ab8500_regulator_is_enabled, |
| 261 | .get_voltage = ab8500_fixed_get_voltage, |
| 262 | .list_voltage = ab8500_list_voltage, |
| 263 | }; |
| 264 | |
| 265 | #define AB8500_LDO(_id, min, max, reg, reg_mask, reg_enable, \ |
| 266 | volt_reg, volt_mask, voltages, \ |
| 267 | len_volts) \ |
| 268 | { \ |
| 269 | .desc = { \ |
| 270 | .name = "LDO-" #_id, \ |
| 271 | .ops = &ab8500_regulator_ops, \ |
| 272 | .type = REGULATOR_VOLTAGE, \ |
| 273 | .id = AB8500_LDO_##_id, \ |
| 274 | .owner = THIS_MODULE, \ |
| 275 | }, \ |
| 276 | .min_uV = (min) * 1000, \ |
| 277 | .max_uV = (max) * 1000, \ |
| 278 | .update_reg = reg, \ |
| 279 | .mask = reg_mask, \ |
| 280 | .enable = reg_enable, \ |
| 281 | .voltage_reg = volt_reg, \ |
| 282 | .voltage_mask = volt_mask, \ |
| 283 | .supported_voltages = voltages, \ |
| 284 | .voltages_len = len_volts, \ |
| 285 | .fixed_uV = 0, \ |
| 286 | } |
| 287 | |
| 288 | #define AB8500_FIXED_LDO(_id, fixed, reg, reg_mask, \ |
| 289 | reg_enable) \ |
| 290 | { \ |
| 291 | .desc = { \ |
| 292 | .name = "LDO-" #_id, \ |
| 293 | .ops = &ab8500_ldo_fixed_ops, \ |
| 294 | .type = REGULATOR_VOLTAGE, \ |
| 295 | .id = AB8500_LDO_##_id, \ |
| 296 | .owner = THIS_MODULE, \ |
| 297 | }, \ |
| 298 | .fixed_uV = fixed * 1000, \ |
| 299 | .update_reg = reg, \ |
| 300 | .mask = reg_mask, \ |
| 301 | .enable = reg_enable, \ |
| 302 | } |
| 303 | |
| 304 | static struct ab8500_regulator_info ab8500_regulator_info[] = { |
| 305 | /* |
| 306 | * Variable Voltage LDOs |
| 307 | * name, min uV, max uV, ctrl reg, reg mask, enable mask, |
| 308 | * volt ctrl reg, volt ctrl mask, volt table, num supported volts |
| 309 | */ |
| 310 | AB8500_LDO(AUX1, 1100, 3300, 0x0409, 0x3, 0x1, 0x041f, 0xf, |
| 311 | ldo_vauxn_voltages, ARRAY_SIZE(ldo_vauxn_voltages)), |
| 312 | AB8500_LDO(AUX2, 1100, 3300, 0x0409, 0xc, 0x4, 0x0420, 0xf, |
| 313 | ldo_vauxn_voltages, ARRAY_SIZE(ldo_vauxn_voltages)), |
| 314 | AB8500_LDO(AUX3, 1100, 3300, 0x040a, 0x3, 0x1, 0x0421, 0xf, |
| 315 | ldo_vauxn_voltages, ARRAY_SIZE(ldo_vauxn_voltages)), |
| 316 | AB8500_LDO(INTCORE, 1100, 3300, 0x0380, 0x4, 0x4, 0x0380, 0x38, |
| 317 | ldo_vintcore_voltages, ARRAY_SIZE(ldo_vintcore_voltages)), |
| 318 | |
| 319 | /* |
| 320 | * Fixed Voltage LDOs |
| 321 | * name, o/p uV, ctrl reg, enable, disable |
| 322 | */ |
| 323 | AB8500_FIXED_LDO(TVOUT, 2000, 0x0380, 0x2, 0x2), |
| 324 | AB8500_FIXED_LDO(AUDIO, 2000, 0x0383, 0x2, 0x2), |
| 325 | AB8500_FIXED_LDO(ANAMIC1, 2050, 0x0383, 0x4, 0x4), |
| 326 | AB8500_FIXED_LDO(ANAMIC2, 2050, 0x0383, 0x8, 0x8), |
| 327 | AB8500_FIXED_LDO(DMIC, 1800, 0x0383, 0x10, 0x10), |
| 328 | AB8500_FIXED_LDO(ANA, 1200, 0x0383, 0xc, 0x4), |
| 329 | }; |
| 330 | |
| 331 | static inline struct ab8500_regulator_info *find_regulator_info(int id) |
| 332 | { |
| 333 | struct ab8500_regulator_info *info; |
| 334 | int i; |
| 335 | |
| 336 | for (i = 0; i < ARRAY_SIZE(ab8500_regulator_info); i++) { |
| 337 | info = &ab8500_regulator_info[i]; |
| 338 | if (info->desc.id == id) |
| 339 | return info; |
| 340 | } |
| 341 | return NULL; |
| 342 | } |
| 343 | |
| 344 | static __devinit int ab8500_regulator_probe(struct platform_device *pdev) |
| 345 | { |
| 346 | struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent); |
Dan Carpenter | af54dec | 2010-08-14 11:03:16 +0200 | [diff] [blame] | 347 | struct ab8500_platform_data *pdata; |
Sundar R IYER | c789ca2 | 2010-07-13 21:48:56 +0530 | [diff] [blame] | 348 | int i, err; |
| 349 | |
| 350 | if (!ab8500) { |
| 351 | dev_err(&pdev->dev, "null mfd parent\n"); |
| 352 | return -EINVAL; |
| 353 | } |
Dan Carpenter | af54dec | 2010-08-14 11:03:16 +0200 | [diff] [blame] | 354 | pdata = dev_get_platdata(ab8500->dev); |
Sundar R IYER | c789ca2 | 2010-07-13 21:48:56 +0530 | [diff] [blame] | 355 | |
| 356 | /* register all regulators */ |
| 357 | for (i = 0; i < ARRAY_SIZE(ab8500_regulator_info); i++) { |
| 358 | struct ab8500_regulator_info *info = NULL; |
| 359 | |
| 360 | /* assign per-regulator data */ |
| 361 | info = &ab8500_regulator_info[i]; |
| 362 | info->dev = &pdev->dev; |
| 363 | info->ab8500 = ab8500; |
| 364 | |
| 365 | info->regulator = regulator_register(&info->desc, &pdev->dev, |
| 366 | pdata->regulator[i], info); |
| 367 | if (IS_ERR(info->regulator)) { |
| 368 | err = PTR_ERR(info->regulator); |
| 369 | dev_err(&pdev->dev, "failed to register regulator %s\n", |
| 370 | info->desc.name); |
| 371 | /* when we fail, un-register all earlier regulators */ |
Axel Lin | d4876a3 | 2010-08-14 21:44:04 +0800 | [diff] [blame] | 372 | while (--i >= 0) { |
Sundar R IYER | c789ca2 | 2010-07-13 21:48:56 +0530 | [diff] [blame] | 373 | info = &ab8500_regulator_info[i]; |
| 374 | regulator_unregister(info->regulator); |
Sundar R IYER | c789ca2 | 2010-07-13 21:48:56 +0530 | [diff] [blame] | 375 | } |
| 376 | return err; |
| 377 | } |
| 378 | } |
| 379 | |
| 380 | return 0; |
| 381 | } |
| 382 | |
| 383 | static __devexit int ab8500_regulator_remove(struct platform_device *pdev) |
| 384 | { |
| 385 | int i; |
| 386 | |
| 387 | for (i = 0; i < ARRAY_SIZE(ab8500_regulator_info); i++) { |
| 388 | struct ab8500_regulator_info *info = NULL; |
| 389 | info = &ab8500_regulator_info[i]; |
| 390 | regulator_unregister(info->regulator); |
| 391 | } |
| 392 | |
| 393 | return 0; |
| 394 | } |
| 395 | |
| 396 | static struct platform_driver ab8500_regulator_driver = { |
| 397 | .probe = ab8500_regulator_probe, |
| 398 | .remove = __devexit_p(ab8500_regulator_remove), |
| 399 | .driver = { |
| 400 | .name = "ab8500-regulator", |
| 401 | .owner = THIS_MODULE, |
| 402 | }, |
| 403 | }; |
| 404 | |
| 405 | static int __init ab8500_regulator_init(void) |
| 406 | { |
| 407 | int ret; |
| 408 | |
| 409 | ret = platform_driver_register(&ab8500_regulator_driver); |
| 410 | if (ret != 0) |
| 411 | pr_err("Failed to register ab8500 regulator: %d\n", ret); |
| 412 | |
| 413 | return ret; |
| 414 | } |
| 415 | subsys_initcall(ab8500_regulator_init); |
| 416 | |
| 417 | static void __exit ab8500_regulator_exit(void) |
| 418 | { |
| 419 | platform_driver_unregister(&ab8500_regulator_driver); |
| 420 | } |
| 421 | module_exit(ab8500_regulator_exit); |
| 422 | |
| 423 | MODULE_LICENSE("GPL v2"); |
| 424 | MODULE_AUTHOR("Sundar Iyer <sundar.iyer@stericsson.com>"); |
| 425 | MODULE_DESCRIPTION("Regulator Driver for ST-Ericsson AB8500 Mixed-Sig PMIC"); |
| 426 | MODULE_ALIAS("platform:ab8500-regulator"); |