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