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