drivers/regulator/as3711-regulator.c

   1 /*
   2  * AS3711 PMIC regulator driver, using DCDC Step Down and LDO supplies
   3  *
   4  * Copyright (C) 2012 Renesas Electronics Corporation
   5  * Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the version 2 of the GNU General Public License as
   9  * published by the Free Software Foundation
  10  */
  11
  12 #include <linux/err.h>
  13 #include <linux/init.h>
  14 #include <linux/mfd/as3711.h>
  15 #include <linux/module.h>
  16 #include <linux/of.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/regmap.h>
  19 #include <linux/regulator/driver.h>
  20 #include <linux/regulator/of_regulator.h>
  21 #include <linux/slab.h>
  22
  23 struct as3711_regulator_info {
  24         struct regulator_desc   desc;
  25         unsigned int            max_uV;
  26 };
  27
  28 struct as3711_regulator {
  29         struct as3711_regulator_info *reg_info;
  30         struct regulator_dev *rdev;
  31 };
  32
  33 static int as3711_list_voltage_sd(struct regulator_dev *rdev,
  34                                   unsigned int selector)
  35 {
  36         if (selector >= rdev->desc->n_voltages)
  37                 return -EINVAL;
  38
  39         if (!selector)
  40                 return 0;
  41         if (selector < 0x41)
  42                 return 600000 + selector * 12500;
  43         if (selector < 0x71)
  44                 return 1400000 + (selector - 0x40) * 25000;
  45         return 2600000 + (selector - 0x70) * 50000;
  46 }
  47
  48 static int as3711_list_voltage_aldo(struct regulator_dev *rdev,
  49                                     unsigned int selector)
  50 {
  51         if (selector >= rdev->desc->n_voltages)
  52                 return -EINVAL;
  53
  54         if (selector < 0x10)
  55                 return 1200000 + selector * 50000;
  56         return 1800000 + (selector - 0x10) * 100000;
  57 }
  58
  59 static int as3711_list_voltage_dldo(struct regulator_dev *rdev,
  60                                     unsigned int selector)
  61 {
  62         if (selector >= rdev->desc->n_voltages ||
  63             (selector > 0x10 && selector < 0x20))
  64                 return -EINVAL;
  65
  66         if (selector < 0x11)
  67                 return 900000 + selector * 50000;
  68         return 1750000 + (selector - 0x20) * 50000;
  69 }
  70
  71 static int as3711_bound_check(struct regulator_dev *rdev,
  72                               int *min_uV, int *max_uV)
  73 {
  74         struct as3711_regulator *reg = rdev_get_drvdata(rdev);
  75         struct as3711_regulator_info *info = reg->reg_info;
  76
  77         dev_dbg(&rdev->dev, "%s(), %d, %d, %d\n", __func__,
  78                 *min_uV, rdev->desc->min_uV, info->max_uV);
  79
  80         if (*max_uV < *min_uV ||
  81             *min_uV > info->max_uV || rdev->desc->min_uV > *max_uV)
  82                 return -EINVAL;
  83
  84         if (rdev->desc->n_voltages == 1)
  85                 return 0;
  86
  87         if (*max_uV > info->max_uV)
  88                 *max_uV = info->max_uV;
  89
  90         if (*min_uV < rdev->desc->min_uV)
  91                 *min_uV = rdev->desc->min_uV;
  92
  93         return *min_uV;
  94 }
  95
  96 static int as3711_sel_check(int min, int max, int bottom, int step)
  97 {
  98         int sel, voltage;
  99
 100         /* Round up min, when dividing: keeps us within the range */
 101         sel = DIV_ROUND_UP(min - bottom, step);
 102         voltage = sel * step + bottom;
 103         pr_debug("%s(): select %d..%d in %d+N*%d: %d\n", __func__,
 104                min, max, bottom, step, sel);
 105         if (voltage > max)
 106                 return -EINVAL;
 107
 108         return sel;
 109 }
 110
 111 static int as3711_map_voltage_sd(struct regulator_dev *rdev,
 112                                  int min_uV, int max_uV)
 113 {
 114         int ret;
 115
 116         ret = as3711_bound_check(rdev, &min_uV, &max_uV);
 117         if (ret <= 0)
 118                 return ret;
 119
 120         if (min_uV <= 1400000)
 121                 return as3711_sel_check(min_uV, max_uV, 600000, 12500);
 122
 123         if (min_uV <= 2600000)
 124                 return as3711_sel_check(min_uV, max_uV, 1400000, 25000) + 0x40;
 125
 126         return as3711_sel_check(min_uV, max_uV, 2600000, 50000) + 0x70;
 127 }
 128
 129 /*
 130  * The regulator API supports 4 modes of operataion: FAST, NORMAL, IDLE and
 131  * STANDBY. We map them in the following way to AS3711 SD1-4 DCDC modes:
 132  * FAST:        sdX_fast=1
 133  * NORMAL:      low_noise=1
 134  * IDLE:        low_noise=0
 135  */
 136
 137 static int as3711_set_mode_sd(struct regulator_dev *rdev, unsigned int mode)
 138 {
 139         unsigned int fast_bit = rdev->desc->enable_mask,
 140                 low_noise_bit = fast_bit << 4;
 141         u8 val;
 142
 143         switch (mode) {
 144         case REGULATOR_MODE_FAST:
 145                 val = fast_bit | low_noise_bit;
 146                 break;
 147         case REGULATOR_MODE_NORMAL:
 148                 val = low_noise_bit;
 149                 break;
 150         case REGULATOR_MODE_IDLE:
 151                 val = 0;
 152                 break;
 153         default:
 154                 return -EINVAL;
 155         }
 156
 157         return regmap_update_bits(rdev->regmap, AS3711_SD_CONTROL_1,
 158                                   low_noise_bit | fast_bit, val);
 159 }
 160
 161 static unsigned int as3711_get_mode_sd(struct regulator_dev *rdev)
 162 {
 163         unsigned int fast_bit = rdev->desc->enable_mask,
 164                 low_noise_bit = fast_bit << 4, mask = fast_bit | low_noise_bit;
 165         unsigned int val;
 166         int ret = regmap_read(rdev->regmap, AS3711_SD_CONTROL_1, &val);
 167
 168         if (ret < 0)
 169                 return ret;
 170
 171         if ((val & mask) == mask)
 172                 return REGULATOR_MODE_FAST;
 173
 174         if ((val & mask) == low_noise_bit)
 175                 return REGULATOR_MODE_NORMAL;
 176
 177         if (!(val & mask))
 178                 return REGULATOR_MODE_IDLE;
 179
 180         return -EINVAL;
 181 }
 182
 183 static int as3711_map_voltage_aldo(struct regulator_dev *rdev,
 184                                   int min_uV, int max_uV)
 185 {
 186         int ret;
 187
 188         ret = as3711_bound_check(rdev, &min_uV, &max_uV);
 189         if (ret <= 0)
 190                 return ret;
 191
 192         if (min_uV <= 1800000)
 193                 return as3711_sel_check(min_uV, max_uV, 1200000, 50000);
 194
 195         return as3711_sel_check(min_uV, max_uV, 1800000, 100000) + 0x10;
 196 }
 197
 198 static int as3711_map_voltage_dldo(struct regulator_dev *rdev,
 199                                   int min_uV, int max_uV)
 200 {
 201         int ret;
 202
 203         ret = as3711_bound_check(rdev, &min_uV, &max_uV);
 204         if (ret <= 0)
 205                 return ret;
 206
 207         if (min_uV <= 1700000)
 208                 return as3711_sel_check(min_uV, max_uV, 900000, 50000);
 209
 210         return as3711_sel_check(min_uV, max_uV, 1750000, 50000) + 0x20;
 211 }
 212
 213 static struct regulator_ops as3711_sd_ops = {
 214         .is_enabled             = regulator_is_enabled_regmap,
 215         .enable                 = regulator_enable_regmap,
 216         .disable                = regulator_disable_regmap,
 217         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 218         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 219         .list_voltage           = as3711_list_voltage_sd,
 220         .map_voltage            = as3711_map_voltage_sd,
 221         .get_mode               = as3711_get_mode_sd,
 222         .set_mode               = as3711_set_mode_sd,
 223 };
 224
 225 static struct regulator_ops as3711_aldo_ops = {
 226         .is_enabled             = regulator_is_enabled_regmap,
 227         .enable                 = regulator_enable_regmap,
 228         .disable                = regulator_disable_regmap,
 229         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 230         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 231         .list_voltage           = as3711_list_voltage_aldo,
 232         .map_voltage            = as3711_map_voltage_aldo,
 233 };
 234
 235 static struct regulator_ops as3711_dldo_ops = {
 236         .is_enabled             = regulator_is_enabled_regmap,
 237         .enable                 = regulator_enable_regmap,
 238         .disable                = regulator_disable_regmap,
 239         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 240         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 241         .list_voltage           = as3711_list_voltage_dldo,
 242         .map_voltage            = as3711_map_voltage_dldo,
 243 };
 244
 245 #define AS3711_REG(_id, _en_reg, _en_bit, _vmask, _vshift, _min_uV, _max_uV, _sfx)      \
 246         [AS3711_REGULATOR_ ## _id] = {                                                  \
 247         .desc = {                                                                       \
 248                 .name = "as3711-regulator-" # _id,                                      \
 249                 .id = AS3711_REGULATOR_ ## _id,                                         \
 250                 .n_voltages = (_vmask + 1),                                             \
 251                 .ops = &as3711_ ## _sfx ## _ops,                                        \
 252                 .type = REGULATOR_VOLTAGE,                                              \
 253                 .owner = THIS_MODULE,                                                   \
 254                 .vsel_reg = AS3711_ ## _id ## _VOLTAGE,                                 \
 255                 .vsel_mask = _vmask << _vshift,                                         \
 256                 .enable_reg = AS3711_ ## _en_reg,                                       \
 257                 .enable_mask = BIT(_en_bit),                                            \
 258                 .min_uV = _min_uV,                                                      \
 259         },                                                                              \
 260         .max_uV = _max_uV,                                                              \
 261 }
 262
 263 static struct as3711_regulator_info as3711_reg_info[] = {
 264         AS3711_REG(SD_1, SD_CONTROL, 0, 0x7f, 0, 612500, 3350000, sd),
 265         AS3711_REG(SD_2, SD_CONTROL, 1, 0x7f, 0, 612500, 3350000, sd),
 266         AS3711_REG(SD_3, SD_CONTROL, 2, 0x7f, 0, 612500, 3350000, sd),
 267         AS3711_REG(SD_4, SD_CONTROL, 3, 0x7f, 0, 612500, 3350000, sd),
 268         AS3711_REG(LDO_1, LDO_1_VOLTAGE, 7, 0x1f, 0, 1200000, 3300000, aldo),
 269         AS3711_REG(LDO_2, LDO_2_VOLTAGE, 7, 0x1f, 0, 1200000, 3300000, aldo),
 270         AS3711_REG(LDO_3, LDO_3_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
 271         AS3711_REG(LDO_4, LDO_4_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
 272         AS3711_REG(LDO_5, LDO_5_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
 273         AS3711_REG(LDO_6, LDO_6_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
 274         AS3711_REG(LDO_7, LDO_7_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
 275         AS3711_REG(LDO_8, LDO_8_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo),
 276         /* StepUp output voltage depends on supplying regulator */
 277 };
 278
 279 #define AS3711_REGULATOR_NUM ARRAY_SIZE(as3711_reg_info)
 280
 281 static struct of_regulator_match
 282 as3711_regulator_matches[AS3711_REGULATOR_NUM] = {
 283         [AS3711_REGULATOR_SD_1] = { .name = "sd1" },
 284         [AS3711_REGULATOR_SD_2] = { .name = "sd2" },
 285         [AS3711_REGULATOR_SD_3] = { .name = "sd3" },
 286         [AS3711_REGULATOR_SD_4] = { .name = "sd4" },
 287         [AS3711_REGULATOR_LDO_1] = { .name = "ldo1" },
 288         [AS3711_REGULATOR_LDO_2] = { .name = "ldo2" },
 289         [AS3711_REGULATOR_LDO_3] = { .name = "ldo3" },
 290         [AS3711_REGULATOR_LDO_4] = { .name = "ldo4" },
 291         [AS3711_REGULATOR_LDO_5] = { .name = "ldo5" },
 292         [AS3711_REGULATOR_LDO_6] = { .name = "ldo6" },
 293         [AS3711_REGULATOR_LDO_7] = { .name = "ldo7" },
 294         [AS3711_REGULATOR_LDO_8] = { .name = "ldo8" },
 295 };
 296
 297 static int as3711_regulator_parse_dt(struct device *dev,
 298                                 struct device_node **of_node, const int count)
 299 {
 300         struct as3711_regulator_pdata *pdata = dev_get_platdata(dev);
 301         struct device_node *regulators =
 302                 of_find_node_by_name(dev->parent->of_node, "regulators");
 303         struct of_regulator_match *match;
 304         int ret, i;
 305
 306         if (!regulators) {
 307                 dev_err(dev, "regulator node not found\n");
 308                 return -ENODEV;
 309         }
 310
 311         ret = of_regulator_match(dev->parent, regulators,
 312                                  as3711_regulator_matches, count);
 313         of_node_put(regulators);
 314         if (ret < 0) {
 315                 dev_err(dev, "Error parsing regulator init data: %d\n", ret);
 316                 return ret;
 317         }
 318
 319         for (i = 0, match = as3711_regulator_matches; i < count; i++, match++)
 320                 if (match->of_node) {
 321                         pdata->init_data[i] = match->init_data;
 322                         of_node[i] = match->of_node;
 323                 }
 324
 325         return 0;
 326 }
 327
 328 static int as3711_regulator_probe(struct platform_device *pdev)
 329 {
 330         struct as3711_regulator_pdata *pdata = dev_get_platdata(&pdev->dev);
 331         struct as3711 *as3711 = dev_get_drvdata(pdev->dev.parent);
 332         struct regulator_init_data *reg_data;
 333         struct regulator_config config = {.dev = &pdev->dev,};
 334         struct as3711_regulator *reg = NULL;
 335         struct as3711_regulator *regs;
 336         struct device_node *of_node[AS3711_REGULATOR_NUM] = {};
 337         struct regulator_dev *rdev;
 338         struct as3711_regulator_info *ri;
 339         int ret;
 340         int id;
 341
 342         if (!pdata) {
 343                 dev_err(&pdev->dev, "No platform data...\n");
 344                 return -ENODEV;
 345         }
 346
 347         if (pdev->dev.parent->of_node) {
 348                 ret = as3711_regulator_parse_dt(&pdev->dev, of_node, AS3711_REGULATOR_NUM);
 349                 if (ret < 0) {
 350                         dev_err(&pdev->dev, "DT parsing failed: %d\n", ret);
 351                         return ret;
 352                 }
 353         }
 354
 355         regs = devm_kzalloc(&pdev->dev, AS3711_REGULATOR_NUM *
 356                         sizeof(struct as3711_regulator), GFP_KERNEL);
 357         if (!regs) {
 358                 dev_err(&pdev->dev, "Memory allocation failed exiting..\n");
 359                 return -ENOMEM;
 360         }
 361
 362         for (id = 0, ri = as3711_reg_info; id < AS3711_REGULATOR_NUM; ++id, ri++) {
 363                 reg_data = pdata->init_data[id];
 364
 365                 /* No need to register if there is no regulator data */
 366                 if (!reg_data)
 367                         continue;
 368
 369                 reg = &regs[id];
 370                 reg->reg_info = ri;
 371
 372                 config.init_data = reg_data;
 373                 config.driver_data = reg;
 374                 config.regmap = as3711->regmap;
 375                 config.of_node = of_node[id];
 376
 377                 rdev = regulator_register(&ri->desc, &config);
 378                 if (IS_ERR(rdev)) {
 379                         dev_err(&pdev->dev, "Failed to register regulator %s\n",
 380                                 ri->desc.name);
 381                         ret = PTR_ERR(rdev);
 382                         goto eregreg;
 383                 }
 384                 reg->rdev = rdev;
 385         }
 386         platform_set_drvdata(pdev, regs);
 387         return 0;
 388
 389 eregreg:
 390         while (--id >= 0)
 391                 regulator_unregister(regs[id].rdev);
 392
 393         return ret;
 394 }
 395
 396 static int as3711_regulator_remove(struct platform_device *pdev)
 397 {
 398         struct as3711_regulator *regs = platform_get_drvdata(pdev);
 399         int id;
 400
 401         for (id = 0; id < AS3711_REGULATOR_NUM; ++id)
 402                 regulator_unregister(regs[id].rdev);
 403         return 0;
 404 }
 405
 406 static struct platform_driver as3711_regulator_driver = {
 407         .driver = {
 408                 .name   = "as3711-regulator",
 409                 .owner  = THIS_MODULE,
 410         },
 411         .probe          = as3711_regulator_probe,
 412         .remove         = as3711_regulator_remove,
 413 };
 414
 415 static int __init as3711_regulator_init(void)
 416 {
 417         return platform_driver_register(&as3711_regulator_driver);
 418 }
 419 subsys_initcall(as3711_regulator_init);
 420
 421 static void __exit as3711_regulator_exit(void)
 422 {
 423         platform_driver_unregister(&as3711_regulator_driver);
 424 }
 425 module_exit(as3711_regulator_exit);
 426
 427 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>");
 428 MODULE_DESCRIPTION("AS3711 regulator driver");
 429 MODULE_ALIAS("platform:as3711-regulator");
 430 MODULE_LICENSE("GPL v2");