drivers/regulator/s2mpa01.c

   1 /*
   2  * Copyright (c) 2013 Samsung Electronics Co., Ltd
   3  *              http://www.samsung.com
   4  *
   5  *  This program is free software; you can redistribute  it and/or modify it
   6  *  under  the terms of  the GNU General  Public License as published by the
   7  *  Free Software Foundation;  either version 2 of the  License, or (at your
   8  *  option) any later version.
   9  *
  10  */
  11
  12 #include <linux/bug.h>
  13 #include <linux/err.h>
  14 #include <linux/gpio.h>
  15 #include <linux/slab.h>
  16 #include <linux/module.h>
  17 #include <linux/of.h>
  18 #include <linux/regmap.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/regulator/driver.h>
  21 #include <linux/regulator/machine.h>
  22 #include <linux/regulator/of_regulator.h>
  23 #include <linux/mfd/samsung/core.h>
  24 #include <linux/mfd/samsung/s2mpa01.h>
  25
  26 #define S2MPA01_REGULATOR_CNT ARRAY_SIZE(regulators)
  27
  28 struct s2mpa01_info {
  29         int ramp_delay24;
  30         int ramp_delay3;
  31         int ramp_delay5;
  32         int ramp_delay16;
  33         int ramp_delay7;
  34         int ramp_delay8910;
  35 };
  36
  37 static int get_ramp_delay(int ramp_delay)
  38 {
  39         unsigned char cnt = 0;
  40
  41         ramp_delay /= 6250;
  42
  43         while (true) {
  44                 ramp_delay = ramp_delay >> 1;
  45                 if (ramp_delay == 0)
  46                         break;
  47                 cnt++;
  48         }
  49
  50         if (cnt > 3)
  51                 cnt = 3;
  52
  53         return cnt;
  54 }
  55
  56 static int s2mpa01_regulator_set_voltage_time_sel(struct regulator_dev *rdev,
  57                                    unsigned int old_selector,
  58                                    unsigned int new_selector)
  59 {
  60         struct s2mpa01_info *s2mpa01 = rdev_get_drvdata(rdev);
  61         unsigned int ramp_delay = 0;
  62         int old_volt, new_volt;
  63
  64         switch (rdev_get_id(rdev)) {
  65         case S2MPA01_BUCK2:
  66         case S2MPA01_BUCK4:
  67                 ramp_delay = s2mpa01->ramp_delay24;
  68                 break;
  69         case S2MPA01_BUCK3:
  70                 ramp_delay = s2mpa01->ramp_delay3;
  71                 break;
  72         case S2MPA01_BUCK5:
  73                 ramp_delay = s2mpa01->ramp_delay5;
  74                 break;
  75         case S2MPA01_BUCK1:
  76         case S2MPA01_BUCK6:
  77                 ramp_delay = s2mpa01->ramp_delay16;
  78                 break;
  79         case S2MPA01_BUCK7:
  80                 ramp_delay = s2mpa01->ramp_delay7;
  81                 break;
  82         case S2MPA01_BUCK8:
  83         case S2MPA01_BUCK9:
  84         case S2MPA01_BUCK10:
  85                 ramp_delay = s2mpa01->ramp_delay8910;
  86                 break;
  87         }
  88
  89         if (ramp_delay == 0)
  90                 ramp_delay = rdev->desc->ramp_delay;
  91
  92         old_volt = rdev->desc->min_uV + (rdev->desc->uV_step * old_selector);
  93         new_volt = rdev->desc->min_uV + (rdev->desc->uV_step * new_selector);
  94
  95         return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
  96 }
  97
  98 static int s2mpa01_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
  99 {
 100         struct s2mpa01_info *s2mpa01 = rdev_get_drvdata(rdev);
 101         unsigned int ramp_val, ramp_shift, ramp_reg = S2MPA01_REG_RAMP2;
 102         unsigned int ramp_enable = 1, enable_shift = 0;
 103         int ret;
 104
 105         switch (rdev_get_id(rdev)) {
 106         case S2MPA01_BUCK1:
 107                 enable_shift = S2MPA01_BUCK1_RAMP_EN_SHIFT;
 108                 if (!ramp_delay) {
 109                         ramp_enable = 0;
 110                         break;
 111                 }
 112
 113                 if (ramp_delay > s2mpa01->ramp_delay16)
 114                         s2mpa01->ramp_delay16 = ramp_delay;
 115                 else
 116                         ramp_delay = s2mpa01->ramp_delay16;
 117
 118                 ramp_shift = S2MPA01_BUCK16_RAMP_SHIFT;
 119                 break;
 120         case S2MPA01_BUCK2:
 121                 enable_shift = S2MPA01_BUCK2_RAMP_EN_SHIFT;
 122                 if (!ramp_delay) {
 123                         ramp_enable = 0;
 124                         break;
 125                 }
 126
 127                 if (ramp_delay > s2mpa01->ramp_delay24)
 128                         s2mpa01->ramp_delay24 = ramp_delay;
 129                 else
 130                         ramp_delay = s2mpa01->ramp_delay24;
 131
 132                 ramp_shift = S2MPA01_BUCK24_RAMP_SHIFT;
 133                 ramp_reg = S2MPA01_REG_RAMP1;
 134                 break;
 135         case S2MPA01_BUCK3:
 136                 enable_shift = S2MPA01_BUCK3_RAMP_EN_SHIFT;
 137                 if (!ramp_delay) {
 138                         ramp_enable = 0;
 139                         break;
 140                 }
 141
 142                 s2mpa01->ramp_delay3 = ramp_delay;
 143                 ramp_shift = S2MPA01_BUCK3_RAMP_SHIFT;
 144                 ramp_reg = S2MPA01_REG_RAMP1;
 145                 break;
 146         case S2MPA01_BUCK4:
 147                 enable_shift = S2MPA01_BUCK4_RAMP_EN_SHIFT;
 148                 if (!ramp_delay) {
 149                         ramp_enable = 0;
 150                         break;
 151                 }
 152
 153                 if (ramp_delay > s2mpa01->ramp_delay24)
 154                         s2mpa01->ramp_delay24 = ramp_delay;
 155                 else
 156                         ramp_delay = s2mpa01->ramp_delay24;
 157
 158                 ramp_shift = S2MPA01_BUCK24_RAMP_SHIFT;
 159                 ramp_reg = S2MPA01_REG_RAMP1;
 160                 break;
 161         case S2MPA01_BUCK5:
 162                 s2mpa01->ramp_delay5 = ramp_delay;
 163                 ramp_shift = S2MPA01_BUCK5_RAMP_SHIFT;
 164                 break;
 165         case S2MPA01_BUCK6:
 166                 if (ramp_delay > s2mpa01->ramp_delay16)
 167                         s2mpa01->ramp_delay16 = ramp_delay;
 168                 else
 169                         ramp_delay = s2mpa01->ramp_delay16;
 170
 171                 ramp_shift = S2MPA01_BUCK16_RAMP_SHIFT;
 172                 break;
 173         case S2MPA01_BUCK7:
 174                 s2mpa01->ramp_delay7 = ramp_delay;
 175                 ramp_shift = S2MPA01_BUCK7_RAMP_SHIFT;
 176                 break;
 177         case S2MPA01_BUCK8:
 178         case S2MPA01_BUCK9:
 179         case S2MPA01_BUCK10:
 180                 if (ramp_delay > s2mpa01->ramp_delay8910)
 181                         s2mpa01->ramp_delay8910 = ramp_delay;
 182                 else
 183                         ramp_delay = s2mpa01->ramp_delay8910;
 184
 185                 ramp_shift = S2MPA01_BUCK8910_RAMP_SHIFT;
 186                 break;
 187         default:
 188                 return 0;
 189         }
 190
 191         if (!ramp_enable)
 192                 goto ramp_disable;
 193
 194         /* Ramp delay can be enabled/disabled only for buck[1234] */
 195         if (rdev_get_id(rdev) >= S2MPA01_BUCK1 &&
 196                         rdev_get_id(rdev) <= S2MPA01_BUCK4) {
 197                 ret = regmap_update_bits(rdev->regmap, S2MPA01_REG_RAMP1,
 198                                          1 << enable_shift, 1 << enable_shift);
 199                 if (ret) {
 200                         dev_err(&rdev->dev, "failed to enable ramp rate\n");
 201                         return ret;
 202                 }
 203         }
 204
 205         ramp_val = get_ramp_delay(ramp_delay);
 206
 207         return regmap_update_bits(rdev->regmap, ramp_reg, 0x3 << ramp_shift,
 208                                   ramp_val << ramp_shift);
 209
 210 ramp_disable:
 211         return regmap_update_bits(rdev->regmap, S2MPA01_REG_RAMP1,
 212                                   1 << enable_shift, 0);
 213 }
 214
 215 static struct regulator_ops s2mpa01_ldo_ops = {
 216         .list_voltage           = regulator_list_voltage_linear,
 217         .map_voltage            = regulator_map_voltage_linear,
 218         .is_enabled             = regulator_is_enabled_regmap,
 219         .enable                 = regulator_enable_regmap,
 220         .disable                = regulator_disable_regmap,
 221         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 222         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 223         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 224 };
 225
 226 static struct regulator_ops s2mpa01_buck_ops = {
 227         .list_voltage           = regulator_list_voltage_linear,
 228         .map_voltage            = regulator_map_voltage_linear,
 229         .is_enabled             = regulator_is_enabled_regmap,
 230         .enable                 = regulator_enable_regmap,
 231         .disable                = regulator_disable_regmap,
 232         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 233         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 234         .set_voltage_time_sel   = s2mpa01_regulator_set_voltage_time_sel,
 235         .set_ramp_delay         = s2mpa01_set_ramp_delay,
 236 };
 237
 238 #define regulator_desc_ldo(num, step) {                 \
 239         .name           = "LDO"#num,                    \
 240         .id             = S2MPA01_LDO##num,             \
 241         .ops            = &s2mpa01_ldo_ops,             \
 242         .type           = REGULATOR_VOLTAGE,            \
 243         .owner          = THIS_MODULE,                  \
 244         .min_uV         = MIN_800_MV,                   \
 245         .uV_step        = step,                         \
 246         .n_voltages     = S2MPA01_LDO_N_VOLTAGES,       \
 247         .vsel_reg       = S2MPA01_REG_L1CTRL + num - 1, \
 248         .vsel_mask      = S2MPA01_LDO_VSEL_MASK,        \
 249         .enable_reg     = S2MPA01_REG_L1CTRL + num - 1, \
 250         .enable_mask    = S2MPA01_ENABLE_MASK           \
 251 }
 252
 253 #define regulator_desc_buck1_4(num)     {                       \
 254         .name           = "BUCK"#num,                           \
 255         .id             = S2MPA01_BUCK##num,                    \
 256         .ops            = &s2mpa01_buck_ops,                    \
 257         .type           = REGULATOR_VOLTAGE,                    \
 258         .owner          = THIS_MODULE,                          \
 259         .min_uV         = MIN_600_MV,                           \
 260         .uV_step        = STEP_6_25_MV,                         \
 261         .n_voltages     = S2MPA01_BUCK_N_VOLTAGES,              \
 262         .ramp_delay     = S2MPA01_RAMP_DELAY,                   \
 263         .vsel_reg       = S2MPA01_REG_B1CTRL2 + (num - 1) * 2,  \
 264         .vsel_mask      = S2MPA01_BUCK_VSEL_MASK,               \
 265         .enable_reg     = S2MPA01_REG_B1CTRL1 + (num - 1) * 2,  \
 266         .enable_mask    = S2MPA01_ENABLE_MASK                   \
 267 }
 268
 269 #define regulator_desc_buck5    {                               \
 270         .name           = "BUCK5",                              \
 271         .id             = S2MPA01_BUCK5,                        \
 272         .ops            = &s2mpa01_buck_ops,                    \
 273         .type           = REGULATOR_VOLTAGE,                    \
 274         .owner          = THIS_MODULE,                          \
 275         .min_uV         = MIN_800_MV,                           \
 276         .uV_step        = STEP_6_25_MV,                         \
 277         .n_voltages     = S2MPA01_BUCK_N_VOLTAGES,              \
 278         .ramp_delay     = S2MPA01_RAMP_DELAY,                   \
 279         .vsel_reg       = S2MPA01_REG_B5CTRL2,                  \
 280         .vsel_mask      = S2MPA01_BUCK_VSEL_MASK,               \
 281         .enable_reg     = S2MPA01_REG_B5CTRL1,                  \
 282         .enable_mask    = S2MPA01_ENABLE_MASK                   \
 283 }
 284
 285 #define regulator_desc_buck6_10(num, min, step) {                       \
 286         .name           = "BUCK"#num,                           \
 287         .id             = S2MPA01_BUCK##num,                    \
 288         .ops            = &s2mpa01_buck_ops,                    \
 289         .type           = REGULATOR_VOLTAGE,                    \
 290         .owner          = THIS_MODULE,                          \
 291         .min_uV         = min,                                  \
 292         .uV_step        = step,                                 \
 293         .n_voltages     = S2MPA01_BUCK_N_VOLTAGES,              \
 294         .ramp_delay     = S2MPA01_RAMP_DELAY,                   \
 295         .vsel_reg       = S2MPA01_REG_B6CTRL2 + (num - 6) * 2,  \
 296         .vsel_mask      = S2MPA01_BUCK_VSEL_MASK,               \
 297         .enable_reg     = S2MPA01_REG_B6CTRL1 + (num - 6) * 2,  \
 298         .enable_mask    = S2MPA01_ENABLE_MASK                   \
 299 }
 300
 301 static const struct regulator_desc regulators[] = {
 302         regulator_desc_ldo(1, STEP_25_MV),
 303         regulator_desc_ldo(2, STEP_50_MV),
 304         regulator_desc_ldo(3, STEP_50_MV),
 305         regulator_desc_ldo(4, STEP_50_MV),
 306         regulator_desc_ldo(5, STEP_50_MV),
 307         regulator_desc_ldo(6, STEP_25_MV),
 308         regulator_desc_ldo(7, STEP_50_MV),
 309         regulator_desc_ldo(8, STEP_50_MV),
 310         regulator_desc_ldo(9, STEP_50_MV),
 311         regulator_desc_ldo(10, STEP_50_MV),
 312         regulator_desc_ldo(11, STEP_25_MV),
 313         regulator_desc_ldo(12, STEP_50_MV),
 314         regulator_desc_ldo(13, STEP_50_MV),
 315         regulator_desc_ldo(14, STEP_50_MV),
 316         regulator_desc_ldo(15, STEP_50_MV),
 317         regulator_desc_ldo(16, STEP_50_MV),
 318         regulator_desc_ldo(17, STEP_50_MV),
 319         regulator_desc_ldo(18, STEP_50_MV),
 320         regulator_desc_ldo(19, STEP_50_MV),
 321         regulator_desc_ldo(20, STEP_50_MV),
 322         regulator_desc_ldo(21, STEP_50_MV),
 323         regulator_desc_ldo(22, STEP_25_MV),
 324         regulator_desc_ldo(23, STEP_25_MV),
 325         regulator_desc_ldo(24, STEP_50_MV),
 326         regulator_desc_ldo(25, STEP_50_MV),
 327         regulator_desc_ldo(26, STEP_50_MV),
 328         regulator_desc_buck1_4(1),
 329         regulator_desc_buck1_4(2),
 330         regulator_desc_buck1_4(3),
 331         regulator_desc_buck1_4(4),
 332         regulator_desc_buck5,
 333         regulator_desc_buck6_10(6, MIN_600_MV, STEP_6_25_MV),
 334         regulator_desc_buck6_10(7, MIN_600_MV, STEP_6_25_MV),
 335         regulator_desc_buck6_10(8, MIN_800_MV, STEP_12_5_MV),
 336         regulator_desc_buck6_10(9, MIN_1500_MV, STEP_12_5_MV),
 337         regulator_desc_buck6_10(10, MIN_1000_MV, STEP_12_5_MV),
 338 };
 339
 340 static int s2mpa01_pmic_probe(struct platform_device *pdev)
 341 {
 342         struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 343         struct sec_platform_data *pdata = dev_get_platdata(iodev->dev);
 344         struct of_regulator_match rdata[S2MPA01_REGULATOR_MAX] = { };
 345         struct device_node *reg_np = NULL;
 346         struct regulator_config config = { };
 347         struct s2mpa01_info *s2mpa01;
 348         int i;
 349
 350         s2mpa01 = devm_kzalloc(&pdev->dev, sizeof(*s2mpa01), GFP_KERNEL);
 351         if (!s2mpa01)
 352                 return -ENOMEM;
 353
 354         for (i = 0; i < S2MPA01_REGULATOR_CNT; i++)
 355                 rdata[i].name = regulators[i].name;
 356
 357         if (iodev->dev->of_node) {
 358                 reg_np = of_get_child_by_name(iodev->dev->of_node,
 359                                                         "regulators");
 360                         if (!reg_np) {
 361                                 dev_err(&pdev->dev,
 362                                         "could not find regulators sub-node\n");
 363                                 return -EINVAL;
 364                         }
 365
 366                 of_regulator_match(&pdev->dev, reg_np, rdata,
 367                                                 S2MPA01_REGULATOR_MAX);
 368                 of_node_put(reg_np);
 369         }
 370
 371         platform_set_drvdata(pdev, s2mpa01);
 372
 373         config.dev = &pdev->dev;
 374         config.regmap = iodev->regmap_pmic;
 375         config.driver_data = s2mpa01;
 376
 377         for (i = 0; i < S2MPA01_REGULATOR_MAX; i++) {
 378                 struct regulator_dev *rdev;
 379                 if (pdata)
 380                         config.init_data = pdata->regulators[i].initdata;
 381                 else
 382                         config.init_data = rdata[i].init_data;
 383
 384                 if (reg_np)
 385                         config.of_node = rdata[i].of_node;
 386
 387                 rdev = devm_regulator_register(&pdev->dev,
 388                                                 &regulators[i], &config);
 389                 if (IS_ERR(rdev)) {
 390                         dev_err(&pdev->dev, "regulator init failed for %d\n",
 391                                 i);
 392                         return PTR_ERR(rdev);
 393                 }
 394         }
 395
 396         return 0;
 397 }
 398
 399 static const struct platform_device_id s2mpa01_pmic_id[] = {
 400         { "s2mpa01-pmic", 0},
 401         { },
 402 };
 403 MODULE_DEVICE_TABLE(platform, s2mpa01_pmic_id);
 404
 405 static struct platform_driver s2mpa01_pmic_driver = {
 406         .driver = {
 407                 .name = "s2mpa01-pmic",
 408         },
 409         .probe = s2mpa01_pmic_probe,
 410         .id_table = s2mpa01_pmic_id,
 411 };
 412
 413 module_platform_driver(s2mpa01_pmic_driver);
 414
 415 /* Module information */
 416 MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");
 417 MODULE_AUTHOR("Sachin Kamat <sachin.kamat@samsung.com>");
 418 MODULE_DESCRIPTION("SAMSUNG S2MPA01 Regulator Driver");
 419 MODULE_LICENSE("GPL");