drivers/regulator/hi6421v530-regulator.c

   1 /*
   2  * Device driver for regulators in Hi6421V530 IC
   3  *
   4  * Copyright (c) <2017> HiSilicon Technologies Co., Ltd.
   5  *              http://www.hisilicon.com
   6  * Copyright (c) <2017> Linaro Ltd.
   7  *              http://www.linaro.org
   8  *
   9  * Author: Wang Xiaoyin <hw.wangxiaoyin@hisilicon.com>
  10  *         Guodong Xu <guodong.xu@linaro.org>
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License version 2 as
  14  * published by the Free Software Foundation.
  15  */
  16
  17 #include <linux/mfd/hi6421-pmic.h>
  18 #include <linux/module.h>
  19 #include <linux/of.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/regmap.h>
  22 #include <linux/regulator/driver.h>
  23
  24 /*
  25  * struct hi6421v530_regulator_info - hi6421v530 regulator information
  26  * @desc: regulator description
  27  * @mode_mask: ECO mode bitmask of LDOs; for BUCKs, this masks sleep
  28  * @eco_microamp: eco mode load upper limit (in uA), valid for LDOs only
  29  */
  30 struct hi6421v530_regulator_info {
  31         struct regulator_desc rdesc;
  32         u8 mode_mask;
  33         u32 eco_microamp;
  34 };
  35
  36 /* HI6421v530 regulators */
  37 enum hi6421v530_regulator_id {
  38         HI6421V530_LDO3,
  39         HI6421V530_LDO9,
  40         HI6421V530_LDO11,
  41         HI6421V530_LDO15,
  42         HI6421V530_LDO16,
  43 };
  44
  45 static const unsigned int ldo_3_voltages[] = {
  46         1800000, 1825000, 1850000, 1875000,
  47         1900000, 1925000, 1950000, 1975000,
  48         2000000, 2025000, 2050000, 2075000,
  49         2100000, 2125000, 2150000, 2200000,
  50 };
  51
  52 static const unsigned int ldo_9_11_voltages[] = {
  53         1750000, 1800000, 1825000, 2800000,
  54         2850000, 2950000, 3000000, 3300000,
  55 };
  56
  57 static const unsigned int ldo_15_16_voltages[] = {
  58         1750000, 1800000, 2400000, 2600000,
  59         2700000, 2850000, 2950000, 3000000,
  60 };
  61
  62 static const struct regulator_ops hi6421v530_ldo_ops;
  63
  64 #define HI6421V530_LDO_ENABLE_TIME (350)
  65
  66 /*
  67  * _id - LDO id name string
  68  * v_table - voltage table
  69  * vreg - voltage select register
  70  * vmask - voltage select mask
  71  * ereg - enable register
  72  * emask - enable mask
  73  * odelay - off/on delay time in uS
  74  * ecomask - eco mode mask
  75  * ecoamp - eco mode load uppler limit in uA
  76  */
  77 #define HI6421V530_LDO(_ID, v_table, vreg, vmask, ereg, emask,          \
  78                    odelay, ecomask, ecoamp) {                           \
  79         .rdesc = {                                                      \
  80                 .name            = #_ID,                                \
  81                 .of_match        = of_match_ptr(#_ID),                  \
  82                 .regulators_node = of_match_ptr("regulators"),          \
  83                 .ops             = &hi6421v530_ldo_ops,                 \
  84                 .type            = REGULATOR_VOLTAGE,                   \
  85                 .id              = HI6421V530_##_ID,                    \
  86                 .owner           = THIS_MODULE,                         \
  87                 .n_voltages      = ARRAY_SIZE(v_table),                 \
  88                 .volt_table      = v_table,                             \
  89                 .vsel_reg        = HI6421_REG_TO_BUS_ADDR(vreg),        \
  90                 .vsel_mask       = vmask,                               \
  91                 .enable_reg      = HI6421_REG_TO_BUS_ADDR(ereg),        \
  92                 .enable_mask     = emask,                               \
  93                 .enable_time     = HI6421V530_LDO_ENABLE_TIME,          \
  94                 .off_on_delay    = odelay,                              \
  95         },                                                              \
  96         .mode_mask      = ecomask,                                      \
  97         .eco_microamp   = ecoamp,                                       \
  98 }
  99
 100 /* HI6421V530 regulator information */
 101
 102 static struct hi6421v530_regulator_info hi6421v530_regulator_info[] = {
 103         HI6421V530_LDO(LDO3, ldo_3_voltages, 0x061, 0xf, 0x060, 0x2,
 104                    20000, 0x6, 8000),
 105         HI6421V530_LDO(LDO9, ldo_9_11_voltages, 0x06b, 0x7, 0x06a, 0x2,
 106                    40000, 0x6, 8000),
 107         HI6421V530_LDO(LDO11, ldo_9_11_voltages, 0x06f, 0x7, 0x06e, 0x2,
 108                    40000, 0x6, 8000),
 109         HI6421V530_LDO(LDO15, ldo_15_16_voltages, 0x077, 0x7, 0x076, 0x2,
 110                    40000, 0x6, 8000),
 111         HI6421V530_LDO(LDO16, ldo_15_16_voltages, 0x079, 0x7, 0x078, 0x2,
 112                    40000, 0x6, 8000),
 113 };
 114
 115 static unsigned int hi6421v530_regulator_ldo_get_mode(
 116                                         struct regulator_dev *rdev)
 117 {
 118         struct hi6421v530_regulator_info *info;
 119         unsigned int reg_val;
 120
 121         info = rdev_get_drvdata(rdev);
 122         regmap_read(rdev->regmap, rdev->desc->enable_reg, &reg_val);
 123
 124         if (reg_val & (info->mode_mask))
 125                 return REGULATOR_MODE_IDLE;
 126
 127         return REGULATOR_MODE_NORMAL;
 128 }
 129
 130 static int hi6421v530_regulator_ldo_set_mode(struct regulator_dev *rdev,
 131                                                 unsigned int mode)
 132 {
 133         struct hi6421v530_regulator_info *info;
 134         unsigned int new_mode;
 135
 136         info = rdev_get_drvdata(rdev);
 137         switch (mode) {
 138         case REGULATOR_MODE_NORMAL:
 139                 new_mode = 0;
 140                 break;
 141         case REGULATOR_MODE_IDLE:
 142                 new_mode = info->mode_mask;
 143                 break;
 144         default:
 145                 return -EINVAL;
 146         }
 147
 148         regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
 149                            info->mode_mask, new_mode);
 150
 151         return 0;
 152 }
 153
 154
 155 static const struct regulator_ops hi6421v530_ldo_ops = {
 156         .is_enabled = regulator_is_enabled_regmap,
 157         .enable = regulator_enable_regmap,
 158         .disable = regulator_disable_regmap,
 159         .list_voltage = regulator_list_voltage_table,
 160         .map_voltage = regulator_map_voltage_ascend,
 161         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 162         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 163         .get_mode = hi6421v530_regulator_ldo_get_mode,
 164         .set_mode = hi6421v530_regulator_ldo_set_mode,
 165 };
 166
 167 static int hi6421v530_regulator_probe(struct platform_device *pdev)
 168 {
 169         struct hi6421_pmic *pmic;
 170         struct regulator_dev *rdev;
 171         struct regulator_config config = { };
 172         unsigned int i;
 173
 174         pmic = dev_get_drvdata(pdev->dev.parent);
 175         if (!pmic) {
 176                 dev_err(&pdev->dev, "no pmic in the regulator parent node\n");
 177                 return -ENODEV;
 178         }
 179
 180         for (i = 0; i < ARRAY_SIZE(hi6421v530_regulator_info); i++) {
 181                 config.dev = pdev->dev.parent;
 182                 config.regmap = pmic->regmap;
 183                 config.driver_data = &hi6421v530_regulator_info[i];
 184
 185                 rdev = devm_regulator_register(&pdev->dev,
 186                                 &hi6421v530_regulator_info[i].rdesc,
 187                                 &config);
 188                 if (IS_ERR(rdev)) {
 189                         dev_err(&pdev->dev, "failed to register regulator %s\n",
 190                                 hi6421v530_regulator_info[i].rdesc.name);
 191                         return PTR_ERR(rdev);
 192                 }
 193         }
 194         return 0;
 195 }
 196
 197 static const struct platform_device_id hi6421v530_regulator_table[] = {
 198         { .name = "hi6421v530-regulator" },
 199         {},
 200 };
 201 MODULE_DEVICE_TABLE(platform, hi6421v530_regulator_table);
 202
 203 static struct platform_driver hi6421v530_regulator_driver = {
 204         .id_table = hi6421v530_regulator_table,
 205         .driver = {
 206                 .name   = "hi6421v530-regulator",
 207         },
 208         .probe  = hi6421v530_regulator_probe,
 209 };
 210 module_platform_driver(hi6421v530_regulator_driver);
 211
 212 MODULE_AUTHOR("Wang Xiaoyin <hw.wangxiaoyin@hisilicon.com>");
 213 MODULE_DESCRIPTION("Hi6421v530 regulator driver");
 214 MODULE_LICENSE("GPL v2");