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