drivers/regulator/s2mpa01.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 //
   3 // Copyright (c) 2013 Samsung Electronics Co., Ltd
   4 //              http://www.samsung.com
   5
   6 #include <linux/bug.h>
   7 #include <linux/err.h>
   8 #include <linux/gpio.h>
   9 #include <linux/slab.h>
  10 #include <linux/module.h>
  11 #include <linux/of.h>
  12 #include <linux/regmap.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/regulator/driver.h>
  15 #include <linux/regulator/machine.h>
  16 #include <linux/regulator/of_regulator.h>
  17 #include <linux/mfd/samsung/core.h>
  18 #include <linux/mfd/samsung/s2mpa01.h>
  19
  20 struct s2mpa01_info {
  21         int ramp_delay24;
  22         int ramp_delay3;
  23         int ramp_delay5;
  24         int ramp_delay16;
  25         int ramp_delay7;
  26         int ramp_delay8910;
  27 };
  28
  29 static int get_ramp_delay(int ramp_delay)
  30 {
  31         unsigned char cnt = 0;
  32
  33         ramp_delay /= 6250;
  34
  35         while (true) {
  36                 ramp_delay = ramp_delay >> 1;
  37                 if (ramp_delay == 0)
  38                         break;
  39                 cnt++;
  40         }
  41
  42         if (cnt > 3)
  43                 cnt = 3;
  44
  45         return cnt;
  46 }
  47
  48 static int s2mpa01_regulator_set_voltage_time_sel(struct regulator_dev *rdev,
  49                                    unsigned int old_selector,
  50                                    unsigned int new_selector)
  51 {
  52         struct s2mpa01_info *s2mpa01 = rdev_get_drvdata(rdev);
  53         unsigned int ramp_delay = 0;
  54         int old_volt, new_volt;
  55
  56         switch (rdev_get_id(rdev)) {
  57         case S2MPA01_BUCK2:
  58         case S2MPA01_BUCK4:
  59                 ramp_delay = s2mpa01->ramp_delay24;
  60                 break;
  61         case S2MPA01_BUCK3:
  62                 ramp_delay = s2mpa01->ramp_delay3;
  63                 break;
  64         case S2MPA01_BUCK5:
  65                 ramp_delay = s2mpa01->ramp_delay5;
  66                 break;
  67         case S2MPA01_BUCK1:
  68         case S2MPA01_BUCK6:
  69                 ramp_delay = s2mpa01->ramp_delay16;
  70                 break;
  71         case S2MPA01_BUCK7:
  72                 ramp_delay = s2mpa01->ramp_delay7;
  73                 break;
  74         case S2MPA01_BUCK8:
  75         case S2MPA01_BUCK9:
  76         case S2MPA01_BUCK10:
  77                 ramp_delay = s2mpa01->ramp_delay8910;
  78                 break;
  79         }
  80
  81         if (ramp_delay == 0)
  82                 ramp_delay = rdev->desc->ramp_delay;
  83
  84         old_volt = rdev->desc->min_uV + (rdev->desc->uV_step * old_selector);
  85         new_volt = rdev->desc->min_uV + (rdev->desc->uV_step * new_selector);
  86
  87         return DIV_ROUND_UP(abs(new_volt - old_volt), ramp_delay);
  88 }
  89
  90 static int s2mpa01_set_ramp_delay(struct regulator_dev *rdev, int ramp_delay)
  91 {
  92         struct s2mpa01_info *s2mpa01 = rdev_get_drvdata(rdev);
  93         unsigned int ramp_val, ramp_shift, ramp_reg = S2MPA01_REG_RAMP2;
  94         unsigned int ramp_enable = 1, enable_shift = 0;
  95         int ret;
  96
  97         switch (rdev_get_id(rdev)) {
  98         case S2MPA01_BUCK1:
  99                 enable_shift = S2MPA01_BUCK1_RAMP_EN_SHIFT;
 100                 if (!ramp_delay) {
 101                         ramp_enable = 0;
 102                         break;
 103                 }
 104
 105                 if (ramp_delay > s2mpa01->ramp_delay16)
 106                         s2mpa01->ramp_delay16 = ramp_delay;
 107                 else
 108                         ramp_delay = s2mpa01->ramp_delay16;
 109
 110                 ramp_shift = S2MPA01_BUCK16_RAMP_SHIFT;
 111                 break;
 112         case S2MPA01_BUCK2:
 113                 enable_shift = S2MPA01_BUCK2_RAMP_EN_SHIFT;
 114                 if (!ramp_delay) {
 115                         ramp_enable = 0;
 116                         break;
 117                 }
 118
 119                 if (ramp_delay > s2mpa01->ramp_delay24)
 120                         s2mpa01->ramp_delay24 = ramp_delay;
 121                 else
 122                         ramp_delay = s2mpa01->ramp_delay24;
 123
 124                 ramp_shift = S2MPA01_BUCK24_RAMP_SHIFT;
 125                 ramp_reg = S2MPA01_REG_RAMP1;
 126                 break;
 127         case S2MPA01_BUCK3:
 128                 enable_shift = S2MPA01_BUCK3_RAMP_EN_SHIFT;
 129                 if (!ramp_delay) {
 130                         ramp_enable = 0;
 131                         break;
 132                 }
 133
 134                 s2mpa01->ramp_delay3 = ramp_delay;
 135                 ramp_shift = S2MPA01_BUCK3_RAMP_SHIFT;
 136                 ramp_reg = S2MPA01_REG_RAMP1;
 137                 break;
 138         case S2MPA01_BUCK4:
 139                 enable_shift = S2MPA01_BUCK4_RAMP_EN_SHIFT;
 140                 if (!ramp_delay) {
 141                         ramp_enable = 0;
 142                         break;
 143                 }
 144
 145                 if (ramp_delay > s2mpa01->ramp_delay24)
 146                         s2mpa01->ramp_delay24 = ramp_delay;
 147                 else
 148                         ramp_delay = s2mpa01->ramp_delay24;
 149
 150                 ramp_shift = S2MPA01_BUCK24_RAMP_SHIFT;
 151                 ramp_reg = S2MPA01_REG_RAMP1;
 152                 break;
 153         case S2MPA01_BUCK5:
 154                 s2mpa01->ramp_delay5 = ramp_delay;
 155                 ramp_shift = S2MPA01_BUCK5_RAMP_SHIFT;
 156                 break;
 157         case S2MPA01_BUCK6:
 158                 if (ramp_delay > s2mpa01->ramp_delay16)
 159                         s2mpa01->ramp_delay16 = ramp_delay;
 160                 else
 161                         ramp_delay = s2mpa01->ramp_delay16;
 162
 163                 ramp_shift = S2MPA01_BUCK16_RAMP_SHIFT;
 164                 break;
 165         case S2MPA01_BUCK7:
 166                 s2mpa01->ramp_delay7 = ramp_delay;
 167                 ramp_shift = S2MPA01_BUCK7_RAMP_SHIFT;
 168                 break;
 169         case S2MPA01_BUCK8:
 170         case S2MPA01_BUCK9:
 171         case S2MPA01_BUCK10:
 172                 if (ramp_delay > s2mpa01->ramp_delay8910)
 173                         s2mpa01->ramp_delay8910 = ramp_delay;
 174                 else
 175                         ramp_delay = s2mpa01->ramp_delay8910;
 176
 177                 ramp_shift = S2MPA01_BUCK8910_RAMP_SHIFT;
 178                 break;
 179         default:
 180                 return 0;
 181         }
 182
 183         if (!ramp_enable)
 184                 goto ramp_disable;
 185
 186         /* Ramp delay can be enabled/disabled only for buck[1234] */
 187         if (rdev_get_id(rdev) >= S2MPA01_BUCK1 &&
 188                         rdev_get_id(rdev) <= S2MPA01_BUCK4) {
 189                 ret = regmap_update_bits(rdev->regmap, S2MPA01_REG_RAMP1,
 190                                          1 << enable_shift, 1 << enable_shift);
 191                 if (ret) {
 192                         dev_err(&rdev->dev, "failed to enable ramp rate\n");
 193                         return ret;
 194                 }
 195         }
 196
 197         ramp_val = get_ramp_delay(ramp_delay);
 198
 199         return regmap_update_bits(rdev->regmap, ramp_reg, 0x3 << ramp_shift,
 200                                   ramp_val << ramp_shift);
 201
 202 ramp_disable:
 203         return regmap_update_bits(rdev->regmap, S2MPA01_REG_RAMP1,
 204                                   1 << enable_shift, 0);
 205 }
 206
 207 static const struct regulator_ops s2mpa01_ldo_ops = {
 208         .list_voltage           = regulator_list_voltage_linear,
 209         .map_voltage            = regulator_map_voltage_linear,
 210         .is_enabled             = regulator_is_enabled_regmap,
 211         .enable                 = regulator_enable_regmap,
 212         .disable                = regulator_disable_regmap,
 213         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 214         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 215         .set_voltage_time_sel   = regulator_set_voltage_time_sel,
 216 };
 217
 218 static const struct regulator_ops s2mpa01_buck_ops = {
 219         .list_voltage           = regulator_list_voltage_linear,
 220         .map_voltage            = regulator_map_voltage_linear,
 221         .is_enabled             = regulator_is_enabled_regmap,
 222         .enable                 = regulator_enable_regmap,
 223         .disable                = regulator_disable_regmap,
 224         .get_voltage_sel        = regulator_get_voltage_sel_regmap,
 225         .set_voltage_sel        = regulator_set_voltage_sel_regmap,
 226         .set_voltage_time_sel   = s2mpa01_regulator_set_voltage_time_sel,
 227         .set_ramp_delay         = s2mpa01_set_ramp_delay,
 228 };
 229
 230 #define regulator_desc_ldo(num, step) {                 \
 231         .name           = "LDO"#num,                    \
 232         .of_match       = of_match_ptr("LDO"#num),      \
 233         .regulators_node = of_match_ptr("regulators"),  \
 234         .id             = S2MPA01_LDO##num,             \
 235         .ops            = &s2mpa01_ldo_ops,             \
 236         .type           = REGULATOR_VOLTAGE,            \
 237         .owner          = THIS_MODULE,                  \
 238         .min_uV         = MIN_800_MV,                   \
 239         .uV_step        = step,                         \
 240         .n_voltages     = S2MPA01_LDO_N_VOLTAGES,       \
 241         .vsel_reg       = S2MPA01_REG_L1CTRL + num - 1, \
 242         .vsel_mask      = S2MPA01_LDO_VSEL_MASK,        \
 243         .enable_reg     = S2MPA01_REG_L1CTRL + num - 1, \
 244         .enable_mask    = S2MPA01_ENABLE_MASK           \
 245 }
 246
 247 #define regulator_desc_buck1_4(num)     {                       \
 248         .name           = "BUCK"#num,                           \
 249         .of_match       = of_match_ptr("BUCK"#num),             \
 250         .regulators_node = of_match_ptr("regulators"),          \
 251         .id             = S2MPA01_BUCK##num,                    \
 252         .ops            = &s2mpa01_buck_ops,                    \
 253         .type           = REGULATOR_VOLTAGE,                    \
 254         .owner          = THIS_MODULE,                          \
 255         .min_uV         = MIN_600_MV,                           \
 256         .uV_step        = STEP_6_25_MV,                         \
 257         .n_voltages     = S2MPA01_BUCK_N_VOLTAGES,              \
 258         .ramp_delay     = S2MPA01_RAMP_DELAY,                   \
 259         .vsel_reg       = S2MPA01_REG_B1CTRL2 + (num - 1) * 2,  \
 260         .vsel_mask      = S2MPA01_BUCK_VSEL_MASK,               \
 261         .enable_reg     = S2MPA01_REG_B1CTRL1 + (num - 1) * 2,  \
 262         .enable_mask    = S2MPA01_ENABLE_MASK                   \
 263 }
 264
 265 #define regulator_desc_buck5    {                               \
 266         .name           = "BUCK5",                              \
 267         .of_match       = of_match_ptr("BUCK5"),                \
 268         .regulators_node = of_match_ptr("regulators"),          \
 269         .id             = S2MPA01_BUCK5,                        \
 270         .ops            = &s2mpa01_buck_ops,                    \
 271         .type           = REGULATOR_VOLTAGE,                    \
 272         .owner          = THIS_MODULE,                          \
 273         .min_uV         = MIN_800_MV,                           \
 274         .uV_step        = STEP_6_25_MV,                         \
 275         .n_voltages     = S2MPA01_BUCK_N_VOLTAGES,              \
 276         .ramp_delay     = S2MPA01_RAMP_DELAY,                   \
 277         .vsel_reg       = S2MPA01_REG_B5CTRL2,                  \
 278         .vsel_mask      = S2MPA01_BUCK_VSEL_MASK,               \
 279         .enable_reg     = S2MPA01_REG_B5CTRL1,                  \
 280         .enable_mask    = S2MPA01_ENABLE_MASK                   \
 281 }
 282
 283 #define regulator_desc_buck6_10(num, min, step) {                       \
 284         .name           = "BUCK"#num,                           \
 285         .of_match       = of_match_ptr("BUCK"#num),             \
 286         .regulators_node = of_match_ptr("regulators"),          \
 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_25_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_50_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_50_MV),
 324         regulator_desc_ldo(23, STEP_50_MV),
 325         regulator_desc_ldo(24, STEP_50_MV),
 326         regulator_desc_ldo(25, STEP_50_MV),
 327         regulator_desc_ldo(26, STEP_25_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 regulator_config config = { };
 344         struct s2mpa01_info *s2mpa01;
 345         int i;
 346
 347         s2mpa01 = devm_kzalloc(&pdev->dev, sizeof(*s2mpa01), GFP_KERNEL);
 348         if (!s2mpa01)
 349                 return -ENOMEM;
 350
 351         config.dev = iodev->dev;
 352         config.regmap = iodev->regmap_pmic;
 353         config.driver_data = s2mpa01;
 354
 355         for (i = 0; i < S2MPA01_REGULATOR_MAX; i++) {
 356                 struct regulator_dev *rdev;
 357
 358                 rdev = devm_regulator_register(&pdev->dev,
 359                                                 &regulators[i], &config);
 360                 if (IS_ERR(rdev)) {
 361                         dev_err(&pdev->dev, "regulator init failed for %d\n",
 362                                 i);
 363                         return PTR_ERR(rdev);
 364                 }
 365         }
 366
 367         return 0;
 368 }
 369
 370 static const struct platform_device_id s2mpa01_pmic_id[] = {
 371         { "s2mpa01-pmic", 0},
 372         { },
 373 };
 374 MODULE_DEVICE_TABLE(platform, s2mpa01_pmic_id);
 375
 376 static struct platform_driver s2mpa01_pmic_driver = {
 377         .driver = {
 378                 .name = "s2mpa01-pmic",
 379         },
 380         .probe = s2mpa01_pmic_probe,
 381         .id_table = s2mpa01_pmic_id,
 382 };
 383
 384 module_platform_driver(s2mpa01_pmic_driver);
 385
 386 /* Module information */
 387 MODULE_AUTHOR("Sangbeom Kim <sbkim73@samsung.com>");
 388 MODULE_AUTHOR("Sachin Kamat <sachin.kamat@samsung.com>");
 389 MODULE_DESCRIPTION("Samsung S2MPA01 Regulator Driver");
 390 MODULE_LICENSE("GPL");