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| 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 <[email protected]> |
| 10 | + |
| 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, ®_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 <[email protected]>"); |
| 213 | +MODULE_DESCRIPTION("Hi6421v530 regulator driver"); |
| 214 | +MODULE_LICENSE("GPL v2"); |
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