drivers/regulator/hi6421v530-regulator.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 //
   3 // Device driver for regulators in Hi6421V530 IC
   4 //
   5 // Copyright (c) <2017> HiSilicon Technologies Co., Ltd.
   6 //              http://www.hisilicon.com
   7 // Copyright (c) <2017> Linaro Ltd.
   8 //              https://www.linaro.org
   9 //
  10 // Author: Wang Xiaoyin <hw.wangxiaoyin@hisilicon.com>
  11 //         Guodong Xu <guodong.xu@linaro.org>
  12
  13 #include <linux/mfd/hi6421-pmic.h>
  14 #include <linux/module.h>
  15 #include <linux/of.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/regmap.h>
  18 #include <linux/regulator/driver.h>
  19
  20 /*
  21  * struct hi6421v530_regulator_info - hi6421v530 regulator information
  22  * @desc: regulator description
  23  * @mode_mask: ECO mode bitmask of LDOs; for BUCKs, this masks sleep
  24  */
  25 struct hi6421v530_regulator_info {
  26         struct regulator_desc rdesc;
  27         u8 mode_mask;
  28 };
  29
  30 /* HI6421v530 regulators */
  31 enum hi6421v530_regulator_id {
  32         HI6421V530_LDO3,
  33         HI6421V530_LDO9,
  34         HI6421V530_LDO11,
  35         HI6421V530_LDO15,
  36         HI6421V530_LDO16,
  37 };
  38
  39 static const unsigned int ldo_3_voltages[] = {
  40         1800000, 1825000, 1850000, 1875000,
  41         1900000, 1925000, 1950000, 1975000,
  42         2000000, 2025000, 2050000, 2075000,
  43         2100000, 2125000, 2150000, 2200000,
  44 };
  45
  46 static const unsigned int ldo_9_11_voltages[] = {
  47         1750000, 1800000, 1825000, 2800000,
  48         2850000, 2950000, 3000000, 3300000,
  49 };
  50
  51 static const unsigned int ldo_15_16_voltages[] = {
  52         1750000, 1800000, 2400000, 2600000,
  53         2700000, 2850000, 2950000, 3000000,
  54 };
  55
  56 static const struct regulator_ops hi6421v530_ldo_ops;
  57
  58 #define HI6421V530_LDO_ENABLE_TIME (350)
  59
  60 /*
  61  * _id - LDO id name string
  62  * v_table - voltage table
  63  * vreg - voltage select register
  64  * vmask - voltage select mask
  65  * ereg - enable register
  66  * emask - enable mask
  67  * odelay - off/on delay time in uS
  68  * ecomask - eco mode mask
  69  */
  70 #define HI6421V530_LDO(_ID, v_table, vreg, vmask, ereg, emask,          \
  71                    odelay, ecomask) {                                   \
  72         .rdesc = {                                                      \
  73                 .name            = #_ID,                                \
  74                 .of_match        = of_match_ptr(#_ID),                  \
  75                 .regulators_node = of_match_ptr("regulators"),          \
  76                 .ops             = &hi6421v530_ldo_ops,                 \
  77                 .type            = REGULATOR_VOLTAGE,                   \
  78                 .id              = HI6421V530_##_ID,                    \
  79                 .owner           = THIS_MODULE,                         \
  80                 .n_voltages      = ARRAY_SIZE(v_table),                 \
  81                 .volt_table      = v_table,                             \
  82                 .vsel_reg        = HI6421_REG_TO_BUS_ADDR(vreg),        \
  83                 .vsel_mask       = vmask,                               \
  84                 .enable_reg      = HI6421_REG_TO_BUS_ADDR(ereg),        \
  85                 .enable_mask     = emask,                               \
  86                 .enable_time     = HI6421V530_LDO_ENABLE_TIME,          \
  87                 .off_on_delay    = odelay,                              \
  88         },                                                              \
  89         .mode_mask      = ecomask,                                      \
  90 }
  91
  92 /* HI6421V530 regulator information */
  93
  94 static const struct hi6421v530_regulator_info hi6421v530_regulator_info[] = {
  95         HI6421V530_LDO(LDO3, ldo_3_voltages, 0x061, 0xf, 0x060, 0x2,
  96                    20000, 0x6),
  97         HI6421V530_LDO(LDO9, ldo_9_11_voltages, 0x06b, 0x7, 0x06a, 0x2,
  98                    40000, 0x6),
  99         HI6421V530_LDO(LDO11, ldo_9_11_voltages, 0x06f, 0x7, 0x06e, 0x2,
 100                    40000, 0x6),
 101         HI6421V530_LDO(LDO15, ldo_15_16_voltages, 0x077, 0x7, 0x076, 0x2,
 102                    40000, 0x6),
 103         HI6421V530_LDO(LDO16, ldo_15_16_voltages, 0x079, 0x7, 0x078, 0x2,
 104                    40000, 0x6),
 105 };
 106
 107 static unsigned int hi6421v530_regulator_ldo_get_mode(
 108                                         struct regulator_dev *rdev)
 109 {
 110         const struct hi6421v530_regulator_info *info;
 111         unsigned int reg_val;
 112
 113         info = container_of(rdev->desc, struct hi6421v530_regulator_info, rdesc);
 114         regmap_read(rdev->regmap, rdev->desc->enable_reg, &reg_val);
 115
 116         if (reg_val & (info->mode_mask))
 117                 return REGULATOR_MODE_IDLE;
 118
 119         return REGULATOR_MODE_NORMAL;
 120 }
 121
 122 static int hi6421v530_regulator_ldo_set_mode(struct regulator_dev *rdev,
 123                                                 unsigned int mode)
 124 {
 125         const struct hi6421v530_regulator_info *info;
 126         unsigned int new_mode;
 127
 128         info = container_of(rdev->desc, struct hi6421v530_regulator_info, rdesc);
 129         switch (mode) {
 130         case REGULATOR_MODE_NORMAL:
 131                 new_mode = 0;
 132                 break;
 133         case REGULATOR_MODE_IDLE:
 134                 new_mode = info->mode_mask;
 135                 break;
 136         default:
 137                 return -EINVAL;
 138         }
 139
 140         regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 141                            info->mode_mask, new_mode);
 142
 143         return 0;
 144 }
 145
 146
 147 static const struct regulator_ops hi6421v530_ldo_ops = {
 148         .is_enabled = regulator_is_enabled_regmap,
 149         .enable = regulator_enable_regmap,
 150         .disable = regulator_disable_regmap,
 151         .list_voltage = regulator_list_voltage_table,
 152         .map_voltage = regulator_map_voltage_ascend,
 153         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 154         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 155         .get_mode = hi6421v530_regulator_ldo_get_mode,
 156         .set_mode = hi6421v530_regulator_ldo_set_mode,
 157 };
 158
 159 static int hi6421v530_regulator_probe(struct platform_device *pdev)
 160 {
 161         struct hi6421_pmic *pmic;
 162         struct regulator_dev *rdev;
 163         struct regulator_config config = { };
 164         unsigned int i;
 165
 166         pmic = dev_get_drvdata(pdev->dev.parent);
 167         if (!pmic) {
 168                 dev_err(&pdev->dev, "no pmic in the regulator parent node\n");
 169                 return -ENODEV;
 170         }
 171
 172         for (i = 0; i < ARRAY_SIZE(hi6421v530_regulator_info); i++) {
 173                 config.dev = pdev->dev.parent;
 174                 config.regmap = pmic->regmap;
 175
 176                 rdev = devm_regulator_register(&pdev->dev,
 177                                 &hi6421v530_regulator_info[i].rdesc,
 178                                 &config);
 179                 if (IS_ERR(rdev)) {
 180                         dev_err(&pdev->dev, "failed to register regulator %s\n",
 181                                 hi6421v530_regulator_info[i].rdesc.name);
 182                         return PTR_ERR(rdev);
 183                 }
 184         }
 185         return 0;
 186 }
 187
 188 static const struct platform_device_id hi6421v530_regulator_table[] = {
 189         { .name = "hi6421v530-regulator" },
 190         {},
 191 };
 192 MODULE_DEVICE_TABLE(platform, hi6421v530_regulator_table);
 193
 194 static struct platform_driver hi6421v530_regulator_driver = {
 195         .id_table = hi6421v530_regulator_table,
 196         .driver = {
 197                 .name   = "hi6421v530-regulator",
 198                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 199         },
 200         .probe  = hi6421v530_regulator_probe,
 201 };
 202 module_platform_driver(hi6421v530_regulator_driver);
 203
 204 MODULE_AUTHOR("Wang Xiaoyin <hw.wangxiaoyin@hisilicon.com>");
 205 MODULE_DESCRIPTION("Hi6421v530 regulator driver");
 206 MODULE_LICENSE("GPL v2");