linux/drivers/regulator/sc2731-regulator.c
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   1 //SPDX-License-Identifier: GPL-2.0
   2/*
   3 * Copyright (C) 2017 Spreadtrum Communications Inc.
   4 */
   5
   6#include <linux/module.h>
   7#include <linux/of.h>
   8#include <linux/platform_device.h>
   9#include <linux/regmap.h>
  10#include <linux/regulator/driver.h>
  11#include <linux/regulator/of_regulator.h>
  12
  13/*
  14 * SC2731 regulator lock register
  15 */
  16#define SC2731_PWR_WR_PROT              0xf0c
  17#define SC2731_WR_UNLOCK_VALUE          0x6e7f
  18
  19/*
  20 * SC2731 enable register
  21 */
  22#define SC2731_POWER_PD_SW              0xc28
  23#define SC2731_LDO_CAMA0_PD             0xcfc
  24#define SC2731_LDO_CAMA1_PD             0xd04
  25#define SC2731_LDO_CAMMOT_PD            0xd0c
  26#define SC2731_LDO_VLDO_PD              0xd6c
  27#define SC2731_LDO_EMMCCORE_PD          0xd2c
  28#define SC2731_LDO_SDCORE_PD            0xd74
  29#define SC2731_LDO_SDIO_PD              0xd70
  30#define SC2731_LDO_WIFIPA_PD            0xd4c
  31#define SC2731_LDO_USB33_PD             0xd5c
  32#define SC2731_LDO_CAMD0_PD             0xd7c
  33#define SC2731_LDO_CAMD1_PD             0xd84
  34#define SC2731_LDO_CON_PD               0xd8c
  35#define SC2731_LDO_CAMIO_PD             0xd94
  36#define SC2731_LDO_SRAM_PD              0xd78
  37
  38/*
  39 * SC2731 enable mask
  40 */
  41#define SC2731_DCDC_CPU0_PD_MASK        BIT(4)
  42#define SC2731_DCDC_CPU1_PD_MASK        BIT(3)
  43#define SC2731_DCDC_RF_PD_MASK          BIT(11)
  44#define SC2731_LDO_CAMA0_PD_MASK        BIT(0)
  45#define SC2731_LDO_CAMA1_PD_MASK        BIT(0)
  46#define SC2731_LDO_CAMMOT_PD_MASK       BIT(0)
  47#define SC2731_LDO_VLDO_PD_MASK         BIT(0)
  48#define SC2731_LDO_EMMCCORE_PD_MASK     BIT(0)
  49#define SC2731_LDO_SDCORE_PD_MASK       BIT(0)
  50#define SC2731_LDO_SDIO_PD_MASK         BIT(0)
  51#define SC2731_LDO_WIFIPA_PD_MASK       BIT(0)
  52#define SC2731_LDO_USB33_PD_MASK        BIT(0)
  53#define SC2731_LDO_CAMD0_PD_MASK        BIT(0)
  54#define SC2731_LDO_CAMD1_PD_MASK        BIT(0)
  55#define SC2731_LDO_CON_PD_MASK          BIT(0)
  56#define SC2731_LDO_CAMIO_PD_MASK        BIT(0)
  57#define SC2731_LDO_SRAM_PD_MASK         BIT(0)
  58
  59/*
  60 * SC2731 vsel register
  61 */
  62#define SC2731_DCDC_CPU0_VOL            0xc54
  63#define SC2731_DCDC_CPU1_VOL            0xc64
  64#define SC2731_DCDC_RF_VOL              0xcb8
  65#define SC2731_LDO_CAMA0_VOL            0xd00
  66#define SC2731_LDO_CAMA1_VOL            0xd08
  67#define SC2731_LDO_CAMMOT_VOL           0xd10
  68#define SC2731_LDO_VLDO_VOL             0xd28
  69#define SC2731_LDO_EMMCCORE_VOL         0xd30
  70#define SC2731_LDO_SDCORE_VOL           0xd38
  71#define SC2731_LDO_SDIO_VOL             0xd40
  72#define SC2731_LDO_WIFIPA_VOL           0xd50
  73#define SC2731_LDO_USB33_VOL            0xd60
  74#define SC2731_LDO_CAMD0_VOL            0xd80
  75#define SC2731_LDO_CAMD1_VOL            0xd88
  76#define SC2731_LDO_CON_VOL              0xd90
  77#define SC2731_LDO_CAMIO_VOL            0xd98
  78#define SC2731_LDO_SRAM_VOL             0xdB0
  79
  80/*
  81 * SC2731 vsel register mask
  82 */
  83#define SC2731_DCDC_CPU0_VOL_MASK       GENMASK(8, 0)
  84#define SC2731_DCDC_CPU1_VOL_MASK       GENMASK(8, 0)
  85#define SC2731_DCDC_RF_VOL_MASK         GENMASK(8, 0)
  86#define SC2731_LDO_CAMA0_VOL_MASK       GENMASK(7, 0)
  87#define SC2731_LDO_CAMA1_VOL_MASK       GENMASK(7, 0)
  88#define SC2731_LDO_CAMMOT_VOL_MASK      GENMASK(7, 0)
  89#define SC2731_LDO_VLDO_VOL_MASK        GENMASK(7, 0)
  90#define SC2731_LDO_EMMCCORE_VOL_MASK    GENMASK(7, 0)
  91#define SC2731_LDO_SDCORE_VOL_MASK      GENMASK(7, 0)
  92#define SC2731_LDO_SDIO_VOL_MASK        GENMASK(7, 0)
  93#define SC2731_LDO_WIFIPA_VOL_MASK      GENMASK(7, 0)
  94#define SC2731_LDO_USB33_VOL_MASK       GENMASK(7, 0)
  95#define SC2731_LDO_CAMD0_VOL_MASK       GENMASK(6, 0)
  96#define SC2731_LDO_CAMD1_VOL_MASK       GENMASK(6, 0)
  97#define SC2731_LDO_CON_VOL_MASK         GENMASK(6, 0)
  98#define SC2731_LDO_CAMIO_VOL_MASK       GENMASK(6, 0)
  99#define SC2731_LDO_SRAM_VOL_MASK        GENMASK(6, 0)
 100
 101enum sc2731_regulator_id {
 102        SC2731_BUCK_CPU0,
 103        SC2731_BUCK_CPU1,
 104        SC2731_BUCK_RF,
 105        SC2731_LDO_CAMA0,
 106        SC2731_LDO_CAMA1,
 107        SC2731_LDO_CAMMOT,
 108        SC2731_LDO_VLDO,
 109        SC2731_LDO_EMMCCORE,
 110        SC2731_LDO_SDCORE,
 111        SC2731_LDO_SDIO,
 112        SC2731_LDO_WIFIPA,
 113        SC2731_LDO_USB33,
 114        SC2731_LDO_CAMD0,
 115        SC2731_LDO_CAMD1,
 116        SC2731_LDO_CON,
 117        SC2731_LDO_CAMIO,
 118        SC2731_LDO_SRAM,
 119};
 120
 121static const struct regulator_ops sc2731_regu_linear_ops = {
 122        .enable = regulator_enable_regmap,
 123        .disable = regulator_disable_regmap,
 124        .is_enabled = regulator_is_enabled_regmap,
 125        .list_voltage = regulator_list_voltage_linear,
 126        .get_voltage_sel = regulator_get_voltage_sel_regmap,
 127        .set_voltage_sel = regulator_set_voltage_sel_regmap,
 128};
 129
 130#define SC2731_REGU_LINEAR(_id, en_reg, en_mask, vreg, vmask,   \
 131                          vstep, vmin, vmax) {                  \
 132        .name                   = #_id,                         \
 133        .of_match               = of_match_ptr(#_id),           \
 134        .ops                    = &sc2731_regu_linear_ops,      \
 135        .type                   = REGULATOR_VOLTAGE,            \
 136        .id                     = SC2731_##_id,                 \
 137        .owner                  = THIS_MODULE,                  \
 138        .min_uV                 = vmin,                         \
 139        .n_voltages             = ((vmax) - (vmin)) / (vstep) + 1,      \
 140        .uV_step                = vstep,                        \
 141        .enable_is_inverted     = true,                         \
 142        .enable_val             = 0,                            \
 143        .enable_reg             = en_reg,                       \
 144        .enable_mask            = en_mask,                      \
 145        .vsel_reg               = vreg,                         \
 146        .vsel_mask              = vmask,                        \
 147}
 148
 149static struct regulator_desc regulators[] = {
 150        SC2731_REGU_LINEAR(BUCK_CPU0, SC2731_POWER_PD_SW,
 151                           SC2731_DCDC_CPU0_PD_MASK, SC2731_DCDC_CPU0_VOL,
 152                           SC2731_DCDC_CPU0_VOL_MASK, 3125, 400000, 1996875),
 153        SC2731_REGU_LINEAR(BUCK_CPU1, SC2731_POWER_PD_SW,
 154                           SC2731_DCDC_CPU1_PD_MASK, SC2731_DCDC_CPU1_VOL,
 155                           SC2731_DCDC_CPU1_VOL_MASK, 3125, 400000, 1996875),
 156        SC2731_REGU_LINEAR(BUCK_RF, SC2731_POWER_PD_SW, SC2731_DCDC_RF_PD_MASK,
 157                           SC2731_DCDC_RF_VOL, SC2731_DCDC_RF_VOL_MASK,
 158                           3125, 600000, 2196875),
 159        SC2731_REGU_LINEAR(LDO_CAMA0, SC2731_LDO_CAMA0_PD,
 160                           SC2731_LDO_CAMA0_PD_MASK, SC2731_LDO_CAMA0_VOL,
 161                           SC2731_LDO_CAMA0_VOL_MASK, 10000, 1200000, 3750000),
 162        SC2731_REGU_LINEAR(LDO_CAMA1, SC2731_LDO_CAMA1_PD,
 163                           SC2731_LDO_CAMA1_PD_MASK, SC2731_LDO_CAMA1_VOL,
 164                           SC2731_LDO_CAMA1_VOL_MASK, 10000, 1200000, 3750000),
 165        SC2731_REGU_LINEAR(LDO_CAMMOT, SC2731_LDO_CAMMOT_PD,
 166                           SC2731_LDO_CAMMOT_PD_MASK, SC2731_LDO_CAMMOT_VOL,
 167                           SC2731_LDO_CAMMOT_VOL_MASK, 10000, 1200000, 3750000),
 168        SC2731_REGU_LINEAR(LDO_VLDO, SC2731_LDO_VLDO_PD,
 169                           SC2731_LDO_VLDO_PD_MASK, SC2731_LDO_VLDO_VOL,
 170                           SC2731_LDO_VLDO_VOL_MASK, 10000, 1200000, 3750000),
 171        SC2731_REGU_LINEAR(LDO_EMMCCORE, SC2731_LDO_EMMCCORE_PD,
 172                           SC2731_LDO_EMMCCORE_PD_MASK, SC2731_LDO_EMMCCORE_VOL,
 173                           SC2731_LDO_EMMCCORE_VOL_MASK, 10000, 1200000,
 174                           3750000),
 175        SC2731_REGU_LINEAR(LDO_SDCORE, SC2731_LDO_SDCORE_PD,
 176                           SC2731_LDO_SDCORE_PD_MASK, SC2731_LDO_SDCORE_VOL,
 177                           SC2731_LDO_SDCORE_VOL_MASK, 10000, 1200000, 3750000),
 178        SC2731_REGU_LINEAR(LDO_SDIO, SC2731_LDO_SDIO_PD,
 179                           SC2731_LDO_SDIO_PD_MASK, SC2731_LDO_SDIO_VOL,
 180                           SC2731_LDO_SDIO_VOL_MASK, 10000, 1200000, 3750000),
 181        SC2731_REGU_LINEAR(LDO_WIFIPA, SC2731_LDO_WIFIPA_PD,
 182                           SC2731_LDO_WIFIPA_PD_MASK, SC2731_LDO_WIFIPA_VOL,
 183                           SC2731_LDO_WIFIPA_VOL_MASK, 10000, 1200000, 3750000),
 184        SC2731_REGU_LINEAR(LDO_USB33, SC2731_LDO_USB33_PD,
 185                           SC2731_LDO_USB33_PD_MASK, SC2731_LDO_USB33_VOL,
 186                           SC2731_LDO_USB33_VOL_MASK, 10000, 1200000, 3750000),
 187        SC2731_REGU_LINEAR(LDO_CAMD0, SC2731_LDO_CAMD0_PD,
 188                           SC2731_LDO_CAMD0_PD_MASK, SC2731_LDO_CAMD0_VOL,
 189                           SC2731_LDO_CAMD0_VOL_MASK, 6250, 1000000, 1793750),
 190        SC2731_REGU_LINEAR(LDO_CAMD1, SC2731_LDO_CAMD1_PD,
 191                           SC2731_LDO_CAMD1_PD_MASK, SC2731_LDO_CAMD1_VOL,
 192                           SC2731_LDO_CAMD1_VOL_MASK, 6250, 1000000, 1793750),
 193        SC2731_REGU_LINEAR(LDO_CON, SC2731_LDO_CON_PD,
 194                           SC2731_LDO_CON_PD_MASK, SC2731_LDO_CON_VOL,
 195                           SC2731_LDO_CON_VOL_MASK, 6250, 1000000, 1793750),
 196        SC2731_REGU_LINEAR(LDO_CAMIO, SC2731_LDO_CAMIO_PD,
 197                           SC2731_LDO_CAMIO_PD_MASK, SC2731_LDO_CAMIO_VOL,
 198                           SC2731_LDO_CAMIO_VOL_MASK, 6250, 1000000, 1793750),
 199        SC2731_REGU_LINEAR(LDO_SRAM, SC2731_LDO_SRAM_PD,
 200                           SC2731_LDO_SRAM_PD_MASK, SC2731_LDO_SRAM_VOL,
 201                           SC2731_LDO_SRAM_VOL_MASK, 6250, 1000000, 1793750),
 202};
 203
 204static int sc2731_regulator_unlock(struct regmap *regmap)
 205{
 206        return regmap_write(regmap, SC2731_PWR_WR_PROT,
 207                            SC2731_WR_UNLOCK_VALUE);
 208}
 209
 210static int sc2731_regulator_probe(struct platform_device *pdev)
 211{
 212        int i, ret;
 213        struct regmap *regmap;
 214        struct regulator_config config = { };
 215        struct regulator_dev *rdev;
 216
 217        regmap = dev_get_regmap(pdev->dev.parent, NULL);
 218        if (!regmap) {
 219                dev_err(&pdev->dev, "failed to get regmap.\n");
 220                return -ENODEV;
 221        }
 222
 223        ret = sc2731_regulator_unlock(regmap);
 224        if (ret) {
 225                dev_err(&pdev->dev, "failed to release regulator lock\n");
 226                return ret;
 227        }
 228
 229        config.dev = &pdev->dev;
 230        config.regmap = regmap;
 231
 232        for (i = 0; i < ARRAY_SIZE(regulators); i++) {
 233                rdev = devm_regulator_register(&pdev->dev, &regulators[i],
 234                                               &config);
 235                if (IS_ERR(rdev)) {
 236                        dev_err(&pdev->dev, "failed to register regulator %s\n",
 237                                regulators[i].name);
 238                        return PTR_ERR(rdev);
 239                }
 240        }
 241
 242        return 0;
 243}
 244
 245static struct platform_driver sc2731_regulator_driver = {
 246        .driver = {
 247                .name = "sc27xx-regulator",
 248        },
 249        .probe = sc2731_regulator_probe,
 250};
 251
 252module_platform_driver(sc2731_regulator_driver);
 253
 254MODULE_AUTHOR("Chen Junhui <erick.chen@spreadtrum.com>");
 255MODULE_DESCRIPTION("Spreadtrum SC2731 regulator driver");
 256MODULE_LICENSE("GPL v2");
 257