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