drivers/regulator/hi655x-regulator.c

   1 /*
   2  * Device driver for regulators in Hi655x IC
   3  *
   4  * Copyright (c) 2016 Hisilicon.
   5  *
   6  * Authors:
   7  * Chen Feng <puck.chen@hisilicon.com>
   8  * Fei  Wang <w.f@huawei.com>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14
  15 #include <linux/bitops.h>
  16 #include <linux/device.h>
  17 #include <linux/err.h>
  18 #include <linux/module.h>
  19 #include <linux/io.h>
  20 #include <linux/of.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/regmap.h>
  23 #include <linux/regulator/driver.h>
  24 #include <linux/regulator/machine.h>
  25 #include <linux/regulator/of_regulator.h>
  26 #include <linux/mfd/hi655x-pmic.h>
  27
  28 struct hi655x_regulator {
  29         unsigned int disable_reg;
  30         unsigned int status_reg;
  31         unsigned int ctrl_regs;
  32         unsigned int ctrl_mask;
  33         struct regulator_desc rdesc;
  34 };
  35
  36 /* LDO7 & LDO10 */
  37 static const unsigned int ldo7_voltages[] = {
  38         1800000, 1850000, 2850000, 2900000,
  39         3000000, 3100000, 3200000, 3300000,
  40 };
  41
  42 static const unsigned int ldo19_voltages[] = {
  43         1800000, 1850000, 1900000, 1750000,
  44         2800000, 2850000, 2900000, 3000000,
  45 };
  46
  47 static const unsigned int ldo22_voltages[] = {
  48          900000, 1000000, 1050000, 1100000,
  49         1150000, 1175000, 1185000, 1200000,
  50 };
  51
  52 enum hi655x_regulator_id {
  53         HI655X_LDO0,
  54         HI655X_LDO1,
  55         HI655X_LDO2,
  56         HI655X_LDO3,
  57         HI655X_LDO4,
  58         HI655X_LDO5,
  59         HI655X_LDO6,
  60         HI655X_LDO7,
  61         HI655X_LDO8,
  62         HI655X_LDO9,
  63         HI655X_LDO10,
  64         HI655X_LDO11,
  65         HI655X_LDO12,
  66         HI655X_LDO13,
  67         HI655X_LDO14,
  68         HI655X_LDO15,
  69         HI655X_LDO16,
  70         HI655X_LDO17,
  71         HI655X_LDO18,
  72         HI655X_LDO19,
  73         HI655X_LDO20,
  74         HI655X_LDO21,
  75         HI655X_LDO22,
  76 };
  77
  78 static int hi655x_is_enabled(struct regulator_dev *rdev)
  79 {
  80         unsigned int value = 0;
  81
  82         struct hi655x_regulator *regulator = rdev_get_drvdata(rdev);
  83
  84         regmap_read(rdev->regmap, regulator->status_reg, &value);
  85         return (value & BIT(regulator->ctrl_mask));
  86 }
  87
  88 static int hi655x_disable(struct regulator_dev *rdev)
  89 {
  90         int ret = 0;
  91
  92         struct hi655x_regulator *regulator = rdev_get_drvdata(rdev);
  93
  94         ret = regmap_write(rdev->regmap, regulator->disable_reg,
  95                            BIT(regulator->ctrl_mask));
  96         return ret;
  97 }
  98
  99 static struct regulator_ops hi655x_regulator_ops = {
 100         .enable = regulator_enable_regmap,
 101         .disable = hi655x_disable,
 102         .is_enabled = hi655x_is_enabled,
 103         .list_voltage = regulator_list_voltage_table,
 104         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 105         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 106 };
 107
 108 static struct regulator_ops hi655x_ldo_linear_ops = {
 109         .enable = regulator_enable_regmap,
 110         .disable = hi655x_disable,
 111         .is_enabled = hi655x_is_enabled,
 112         .list_voltage = regulator_list_voltage_linear,
 113         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 114         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 115 };
 116
 117 #define HI655X_LDO(_ID, vreg, vmask, ereg, dreg,                 \
 118                    sreg, cmask, vtable) {                        \
 119         .rdesc = {                                               \
 120                 .name            = #_ID,                         \
 121                 .of_match        = of_match_ptr(#_ID),           \
 122                 .ops             = &hi655x_regulator_ops,        \
 123                 .regulators_node = of_match_ptr("regulators"),   \
 124                 .type            = REGULATOR_VOLTAGE,            \
 125                 .id              = HI655X_##_ID,                 \
 126                 .owner           = THIS_MODULE,                  \
 127                 .n_voltages      = ARRAY_SIZE(vtable),           \
 128                 .volt_table      = vtable,                       \
 129                 .vsel_reg        = HI655X_BUS_ADDR(vreg),        \
 130                 .vsel_mask       = vmask,                        \
 131                 .enable_reg      = HI655X_BUS_ADDR(ereg),        \
 132                 .enable_mask     = BIT(cmask),                   \
 133         },                                                       \
 134         .disable_reg = HI655X_BUS_ADDR(dreg),                    \
 135         .status_reg = HI655X_BUS_ADDR(sreg),                     \
 136         .ctrl_mask = cmask,                                      \
 137 }
 138
 139 #define HI655X_LDO_LINEAR(_ID, vreg, vmask, ereg, dreg,          \
 140                           sreg, cmask, minv, nvolt, vstep) {     \
 141         .rdesc = {                                               \
 142                 .name            = #_ID,                         \
 143                 .of_match        = of_match_ptr(#_ID),           \
 144                 .ops             = &hi655x_ldo_linear_ops,       \
 145                 .regulators_node = of_match_ptr("regulators"),   \
 146                 .type            = REGULATOR_VOLTAGE,            \
 147                 .id              = HI655X_##_ID,                 \
 148                 .owner           = THIS_MODULE,                  \
 149                 .min_uV          = minv,                         \
 150                 .n_voltages      = nvolt,                        \
 151                 .uV_step         = vstep,                        \
 152                 .vsel_reg        = HI655X_BUS_ADDR(vreg),        \
 153                 .vsel_mask       = vmask,                        \
 154                 .enable_reg      = HI655X_BUS_ADDR(ereg),        \
 155                 .enable_mask     = BIT(cmask),                   \
 156         },                                                       \
 157         .disable_reg = HI655X_BUS_ADDR(dreg),                    \
 158         .status_reg = HI655X_BUS_ADDR(sreg),                     \
 159         .ctrl_mask = cmask,                                      \
 160 }
 161
 162 static struct hi655x_regulator regulators[] = {
 163         HI655X_LDO_LINEAR(LDO2, 0x72, 0x07, 0x29, 0x2a, 0x2b, 0x01,
 164                           2500000, 8, 100000),
 165         HI655X_LDO(LDO7, 0x78, 0x07, 0x29, 0x2a, 0x2b, 0x06, ldo7_voltages),
 166         HI655X_LDO(LDO10, 0x78, 0x07, 0x29, 0x2a, 0x2b, 0x01, ldo7_voltages),
 167         HI655X_LDO_LINEAR(LDO13, 0x7e, 0x07, 0x2c, 0x2d, 0x2e, 0x04,
 168                           1600000, 8, 50000),
 169         HI655X_LDO_LINEAR(LDO14, 0x7f, 0x07, 0x2c, 0x2d, 0x2e, 0x05,
 170                           2500000, 8, 100000),
 171         HI655X_LDO_LINEAR(LDO15, 0x80, 0x07, 0x2c, 0x2d, 0x2e, 0x06,
 172                           1600000, 8, 50000),
 173         HI655X_LDO_LINEAR(LDO17, 0x82, 0x07, 0x2f, 0x30, 0x31, 0x00,
 174                           2500000, 8, 100000),
 175         HI655X_LDO(LDO19, 0x84, 0x07, 0x2f, 0x30, 0x31, 0x02, ldo19_voltages),
 176         HI655X_LDO_LINEAR(LDO21, 0x86, 0x07, 0x2f, 0x30, 0x31, 0x04,
 177                           1650000, 8, 50000),
 178         HI655X_LDO(LDO22, 0x87, 0x07, 0x2f, 0x30, 0x31, 0x05, ldo22_voltages),
 179 };
 180
 181 static int hi655x_regulator_probe(struct platform_device *pdev)
 182 {
 183         unsigned int i;
 184         struct hi655x_regulator *regulator;
 185         struct hi655x_pmic *pmic;
 186         struct regulator_config config = { };
 187         struct regulator_dev *rdev;
 188
 189         pmic = dev_get_drvdata(pdev->dev.parent);
 190         if (!pmic) {
 191                 dev_err(&pdev->dev, "no pmic in the regulator parent node\n");
 192                 return -ENODEV;
 193         }
 194
 195         regulator = devm_kzalloc(&pdev->dev, sizeof(*regulator), GFP_KERNEL);
 196         if (!regulator)
 197                 return -ENOMEM;
 198
 199         platform_set_drvdata(pdev, regulator);
 200
 201         config.dev = pdev->dev.parent;
 202         config.regmap = pmic->regmap;
 203         config.driver_data = regulator;
 204         for (i = 0; i < ARRAY_SIZE(regulators); i++) {
 205                 rdev = devm_regulator_register(&pdev->dev,
 206                                                &regulators[i].rdesc,
 207                                                &config);
 208                 if (IS_ERR(rdev)) {
 209                         dev_err(&pdev->dev, "failed to register regulator %s\n",
 210                                 regulator->rdesc.name);
 211                         return PTR_ERR(rdev);
 212                 }
 213         }
 214         return 0;
 215 }
 216
 217 static struct platform_driver hi655x_regulator_driver = {
 218         .driver = {
 219                 .name   = "hi655x-regulator",
 220         },
 221         .probe  = hi655x_regulator_probe,
 222 };
 223 module_platform_driver(hi655x_regulator_driver);
 224
 225 MODULE_AUTHOR("Chen Feng <puck.chen@hisilicon.com>");
 226 MODULE_DESCRIPTION("Hisilicon Hi655x regulator driver");
 227 MODULE_LICENSE("GPL v2");