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->desc->id) {
  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->desc->id) {
 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                 ramp_reg = S2MPA01_REG_RAMP1;
 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_ldo1(num)        {               \
 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         = S2MPA01_LDO_MIN,              \
 246         .uV_step        = S2MPA01_LDO_STEP1,            \
 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 #define regulator_desc_ldo2(num)        {               \
 254         .name           = "LDO"#num,                    \
 255         .id             = S2MPA01_LDO##num,             \
 256         .ops            = &s2mpa01_ldo_ops,             \
 257         .type           = REGULATOR_VOLTAGE,            \
 258         .owner          = THIS_MODULE,                  \
 259         .min_uV         = S2MPA01_LDO_MIN,              \
 260         .uV_step        = S2MPA01_LDO_STEP2,            \
 261         .n_voltages     = S2MPA01_LDO_N_VOLTAGES,       \
 262         .vsel_reg       = S2MPA01_REG_L1CTRL + num - 1, \
 263         .vsel_mask      = S2MPA01_LDO_VSEL_MASK,        \
 264         .enable_reg     = S2MPA01_REG_L1CTRL + num - 1, \
 265         .enable_mask    = S2MPA01_ENABLE_MASK           \
 266 }
 267
 268 #define regulator_desc_buck1_4(num)     {                       \
 269         .name           = "BUCK"#num,                           \
 270         .id             = S2MPA01_BUCK##num,                    \
 271         .ops            = &s2mpa01_buck_ops,                    \
 272         .type           = REGULATOR_VOLTAGE,                    \
 273         .owner          = THIS_MODULE,                          \
 274         .min_uV         = S2MPA01_BUCK_MIN1,                    \
 275         .uV_step        = S2MPA01_BUCK_STEP1,                   \
 276         .n_voltages     = S2MPA01_BUCK_N_VOLTAGES,              \
 277         .ramp_delay     = S2MPA01_RAMP_DELAY,                   \
 278         .vsel_reg       = S2MPA01_REG_B1CTRL2 + (num - 1) * 2,  \
 279         .vsel_mask      = S2MPA01_BUCK_VSEL_MASK,               \
 280         .enable_reg     = S2MPA01_REG_B1CTRL1 + (num - 1) * 2,  \
 281         .enable_mask    = S2MPA01_ENABLE_MASK                   \
 282 }
 283
 284 #define regulator_desc_buck5    {                               \
 285         .name           = "BUCK5",                              \
 286         .id             = S2MPA01_BUCK5,                        \
 287         .ops            = &s2mpa01_buck_ops,                    \
 288         .type           = REGULATOR_VOLTAGE,                    \
 289         .owner          = THIS_MODULE,                          \
 290         .min_uV         = S2MPA01_BUCK_MIN2,                    \
 291         .uV_step        = S2MPA01_BUCK_STEP1,                   \
 292         .n_voltages     = S2MPA01_BUCK_N_VOLTAGES,              \
 293         .ramp_delay     = S2MPA01_RAMP_DELAY,                   \
 294         .vsel_reg       = S2MPA01_REG_B5CTRL2,                  \
 295         .vsel_mask      = S2MPA01_BUCK_VSEL_MASK,               \
 296         .enable_reg     = S2MPA01_REG_B5CTRL1,                  \
 297         .enable_mask    = S2MPA01_ENABLE_MASK                   \
 298 }
 299
 300 #define regulator_desc_buck6_7(num)     {                       \
 301         .name           = "BUCK"#num,                           \
 302         .id             = S2MPA01_BUCK##num,                    \
 303         .ops            = &s2mpa01_buck_ops,                    \
 304         .type           = REGULATOR_VOLTAGE,                    \
 305         .owner          = THIS_MODULE,                          \
 306         .min_uV         = S2MPA01_BUCK_MIN1,                    \
 307         .uV_step        = S2MPA01_BUCK_STEP1,                   \
 308         .n_voltages     = S2MPA01_BUCK_N_VOLTAGES,              \
 309         .ramp_delay     = S2MPA01_RAMP_DELAY,                   \
 310         .vsel_reg       = S2MPA01_REG_B6CTRL2 + (num - 6) * 2,  \
 311         .vsel_mask      = S2MPA01_BUCK_VSEL_MASK,               \
 312         .enable_reg     = S2MPA01_REG_B6CTRL1 + (num - 6) * 2,  \
 313         .enable_mask    = S2MPA01_ENABLE_MASK                   \
 314 }
 315
 316 #define regulator_desc_buck8    {                               \
 317         .name           = "BUCK8",                              \
 318         .id             = S2MPA01_BUCK8,                        \
 319         .ops            = &s2mpa01_buck_ops,                    \
 320         .type           = REGULATOR_VOLTAGE,                    \
 321         .owner          = THIS_MODULE,                          \
 322         .min_uV         = S2MPA01_BUCK_MIN2,                    \
 323         .uV_step        = S2MPA01_BUCK_STEP2,                   \
 324         .n_voltages     = S2MPA01_BUCK_N_VOLTAGES,              \
 325         .ramp_delay     = S2MPA01_RAMP_DELAY,                   \
 326         .vsel_reg       = S2MPA01_REG_B8CTRL2,                  \
 327         .vsel_mask      = S2MPA01_BUCK_VSEL_MASK,               \
 328         .enable_reg     = S2MPA01_REG_B8CTRL1,                  \
 329         .enable_mask    = S2MPA01_ENABLE_MASK                   \
 330 }
 331
 332 #define regulator_desc_buck9    {                               \
 333         .name           = "BUCK9",                              \
 334         .id             = S2MPA01_BUCK9,                        \
 335         .ops            = &s2mpa01_buck_ops,                    \
 336         .type           = REGULATOR_VOLTAGE,                    \
 337         .owner          = THIS_MODULE,                          \
 338         .min_uV         = S2MPA01_BUCK_MIN4,                    \
 339         .uV_step        = S2MPA01_BUCK_STEP2,                   \
 340         .n_voltages     = S2MPA01_BUCK_N_VOLTAGES,              \
 341         .ramp_delay     = S2MPA01_RAMP_DELAY,                   \
 342         .vsel_reg       = S2MPA01_REG_B9CTRL2,                  \
 343         .vsel_mask      = S2MPA01_BUCK_VSEL_MASK,               \
 344         .enable_reg     = S2MPA01_REG_B9CTRL1,                  \
 345         .enable_mask    = S2MPA01_ENABLE_MASK                   \
 346 }
 347
 348 #define regulator_desc_buck10   {                               \
 349         .name           = "BUCK10",                             \
 350         .id             = S2MPA01_BUCK10,                       \
 351         .ops            = &s2mpa01_buck_ops,                    \
 352         .type           = REGULATOR_VOLTAGE,                    \
 353         .owner          = THIS_MODULE,                          \
 354         .min_uV         = S2MPA01_BUCK_MIN3,                    \
 355         .uV_step        = S2MPA01_BUCK_STEP2,                   \
 356         .n_voltages     = S2MPA01_BUCK_N_VOLTAGES,              \
 357         .ramp_delay     = S2MPA01_RAMP_DELAY,                   \
 358         .vsel_reg       = S2MPA01_REG_B10CTRL2,                 \
 359         .vsel_mask      = S2MPA01_BUCK_VSEL_MASK,               \
 360         .enable_reg     = S2MPA01_REG_B10CTRL1,                 \
 361         .enable_mask    = S2MPA01_ENABLE_MASK                   \
 362 }
 363
 364 static struct regulator_desc regulators[] = {
 365         regulator_desc_ldo2(1),
 366         regulator_desc_ldo1(2),
 367         regulator_desc_ldo1(3),
 368         regulator_desc_ldo1(4),
 369         regulator_desc_ldo1(5),
 370         regulator_desc_ldo2(6),
 371         regulator_desc_ldo1(7),
 372         regulator_desc_ldo1(8),
 373         regulator_desc_ldo1(9),
 374         regulator_desc_ldo1(10),
 375         regulator_desc_ldo2(11),
 376         regulator_desc_ldo1(12),
 377         regulator_desc_ldo1(13),
 378         regulator_desc_ldo1(14),
 379         regulator_desc_ldo1(15),
 380         regulator_desc_ldo1(16),
 381         regulator_desc_ldo1(17),
 382         regulator_desc_ldo1(18),
 383         regulator_desc_ldo1(19),
 384         regulator_desc_ldo1(20),
 385         regulator_desc_ldo1(21),
 386         regulator_desc_ldo2(22),
 387         regulator_desc_ldo2(23),
 388         regulator_desc_ldo1(24),
 389         regulator_desc_ldo1(25),
 390         regulator_desc_ldo1(26),
 391         regulator_desc_buck1_4(1),
 392         regulator_desc_buck1_4(2),
 393         regulator_desc_buck1_4(3),
 394         regulator_desc_buck1_4(4),
 395         regulator_desc_buck5,
 396         regulator_desc_buck6_7(6),
 397         regulator_desc_buck6_7(7),
 398         regulator_desc_buck8,
 399         regulator_desc_buck9,
 400         regulator_desc_buck10,
 401 };
 402
 403 static int s2mpa01_pmic_probe(struct platform_device *pdev)
 404 {
 405         struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
 406         struct sec_platform_data *pdata = dev_get_platdata(iodev->dev);
 407         struct of_regulator_match rdata[S2MPA01_REGULATOR_MAX];
 408         struct device_node *reg_np = NULL;
 409         struct regulator_config config = { };
 410         struct s2mpa01_info *s2mpa01;
 411         int i;
 412
 413         s2mpa01 = devm_kzalloc(&pdev->dev, sizeof(*s2mpa01), GFP_KERNEL);
 414         if (!s2mpa01)
 415                 return -ENOMEM;
 416
 417         for (i = 0; i < S2MPA01_REGULATOR_CNT; i++)
 418                 rdata[i].name = regulators[i].name;
 419
 420         if (iodev->dev->of_node) {
 421                 reg_np = of_get_child_by_name(iodev->dev->of_node,
 422                                                         "regulators");
 423                         if (!reg_np) {
 424                                 dev_err(&pdev->dev,
 425                                         "could not find regulators sub-node\n");
 426                                 return -EINVAL;
 427                         }
 428
 429                 of_regulator_match(&pdev->dev, reg_np, rdata,
 430                                                 S2MPA01_REGULATOR_MAX);
 431                 of_node_put(reg_np);
 432         }
 433
 434         platform_set_drvdata(pdev, s2mpa01);
 435
 436         config.dev = &pdev->dev;
 437         config.regmap = iodev->regmap_pmic;
 438         config.driver_data = s2mpa01;
 439
 440         for (i = 0; i < S2MPA01_REGULATOR_MAX; i++) {
 441                 struct regulator_dev *rdev;
 442                 if (pdata)
 443                         config.init_data = pdata->regulators[i].initdata;
 444                 else
 445                         config.init_data = rdata[i].init_data;
 446
 447                 if (reg_np)
 448                         config.of_node = rdata[i].of_node;
 449
 450                 rdev = devm_regulator_register(&pdev->dev,
 451                                                 &regulators[i], &config);
 452                 if (IS_ERR(rdev)) {
 453                         dev_err(&pdev->dev, "regulator init failed for %d\n",
 454                                 i);
 455                         return PTR_ERR(rdev);
 456                 }
 457         }
 458
 459         return 0;
 460 }
 461
 462 static const struct platform_device_id s2mpa01_pmic_id[] = {
 463         { "s2mpa01-pmic", 0},
 464         { },
 465 };
 466 MODULE_DEVICE_TABLE(platform, s2mpa01_pmic_id);
 467
 468 static struct platform_driver s2mpa01_pmic_driver = {
 469         .driver = {
 470                 .name = "s2mpa01-pmic",
 471                 .owner = THIS_MODULE,
 472         },
 473         .probe = s2mpa01_pmic_probe,
 474         .id_table = s2mpa01_pmic_id,
 475 };
 476
 477 module_platform_driver(s2mpa01_pmic_driver);
 478
 479 /* Module information */
 480 MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");
 481 MODULE_AUTHOR("Sachin Kamat <sachin.kamat@samsung.com>");
 482 MODULE_DESCRIPTION("SAMSUNG S2MPA01 Regulator Driver");
 483 MODULE_LICENSE("GPL");