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1// SPDX-License-Identifier: GPL-2.02//3// Device driver for regulators in Hisi IC4//5// Copyright (c) 2013 Linaro Ltd.6// Copyright (c) 2011 HiSilicon Ltd.7// Copyright (c) 2020-2021 Huawei Technologies Co., Ltd.8//9// Guodong Xu <guodong.xu@linaro.org>10 11#include <linux/delay.h>12#include <linux/module.h>13#include <linux/of.h>14#include <linux/platform_device.h>15#include <linux/regmap.h>16#include <linux/regulator/driver.h>17#include <linux/spmi.h>18 19struct hi6421_spmi_reg_priv {20 /* Serialize regulator enable logic */21 struct mutex enable_mutex;22};23 24struct hi6421_spmi_reg_info {25 struct regulator_desc desc;26 u8 eco_mode_mask;27 u32 eco_uA;28};29 30static const unsigned int range_1v5_to_2v0[] = {31 1500000, 1550000, 1600000, 1650000,32 1700000, 1725000, 1750000, 1775000,33 1800000, 1825000, 1850000, 1875000,34 1900000, 1925000, 1950000, 200000035};36 37static const unsigned int range_1v725_to_1v9[] = {38 1725000, 1750000, 1775000, 1800000,39 1825000, 1850000, 1875000, 190000040};41 42static const unsigned int range_1v75_to_3v3[] = {43 1750000, 1800000, 1825000, 2800000,44 2850000, 2950000, 3000000, 330000045};46 47static const unsigned int range_1v8_to_3v0[] = {48 1800000, 1850000, 2400000, 2600000,49 2700000, 2850000, 2950000, 300000050};51 52static const unsigned int range_2v5_to_3v3[] = {53 2500000, 2600000, 2700000, 2800000,54 3000000, 3100000, 3200000, 330000055};56 57static const unsigned int range_2v6_to_3v3[] = {58 2600000, 2700000, 2800000, 2900000,59 3000000, 3100000, 3200000, 330000060};61 62/**63 * HI6421V600_LDO() - specify a LDO power line64 * @_id: LDO id name string65 * @vtable: voltage table66 * @ereg: enable register67 * @emask: enable mask68 * @vreg: voltage select register69 * @odelay: off/on delay time in uS70 * @etime: enable time in uS71 * @ecomask: eco mode mask72 * @ecoamp: eco mode load uppler limit in uA73 */74#define HI6421V600_LDO(_id, vtable, ereg, emask, vreg, \75 odelay, etime, ecomask, ecoamp) \76 [hi6421v600_##_id] = { \77 .desc = { \78 .name = #_id, \79 .of_match = of_match_ptr(#_id), \80 .regulators_node = of_match_ptr("regulators"), \81 .ops = &hi6421_spmi_ldo_rops, \82 .type = REGULATOR_VOLTAGE, \83 .id = hi6421v600_##_id, \84 .owner = THIS_MODULE, \85 .volt_table = vtable, \86 .n_voltages = ARRAY_SIZE(vtable), \87 .vsel_mask = ARRAY_SIZE(vtable) - 1, \88 .vsel_reg = vreg, \89 .enable_reg = ereg, \90 .enable_mask = emask, \91 .enable_time = etime, \92 .ramp_delay = etime, \93 .off_on_delay = odelay, \94 }, \95 .eco_mode_mask = ecomask, \96 .eco_uA = ecoamp, \97 }98 99static int hi6421_spmi_regulator_enable(struct regulator_dev *rdev)100{101 struct hi6421_spmi_reg_priv *priv = rdev_get_drvdata(rdev);102 int ret;103 104 /* cannot enable more than one regulator at one time */105 mutex_lock(&priv->enable_mutex);106 107 ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,108 rdev->desc->enable_mask,109 rdev->desc->enable_mask);110 111 /* Avoid powering up multiple devices at the same time */112 usleep_range(rdev->desc->off_on_delay, rdev->desc->off_on_delay + 60);113 114 mutex_unlock(&priv->enable_mutex);115 116 return ret;117}118 119static unsigned int hi6421_spmi_regulator_get_mode(struct regulator_dev *rdev)120{121 const struct hi6421_spmi_reg_info *sreg;122 unsigned int reg_val;123 124 sreg = container_of(rdev->desc, struct hi6421_spmi_reg_info, desc);125 regmap_read(rdev->regmap, rdev->desc->enable_reg, ®_val);126 127 if (reg_val & sreg->eco_mode_mask)128 return REGULATOR_MODE_IDLE;129 130 return REGULATOR_MODE_NORMAL;131}132 133static int hi6421_spmi_regulator_set_mode(struct regulator_dev *rdev,134 unsigned int mode)135{136 const struct hi6421_spmi_reg_info *sreg;137 unsigned int val;138 139 sreg = container_of(rdev->desc, struct hi6421_spmi_reg_info, desc);140 switch (mode) {141 case REGULATOR_MODE_NORMAL:142 val = 0;143 break;144 case REGULATOR_MODE_IDLE:145 if (!sreg->eco_mode_mask)146 return -EINVAL;147 148 val = sreg->eco_mode_mask;149 break;150 default:151 return -EINVAL;152 }153 154 return regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,155 sreg->eco_mode_mask, val);156}157 158static unsigned int159hi6421_spmi_regulator_get_optimum_mode(struct regulator_dev *rdev,160 int input_uV, int output_uV,161 int load_uA)162{163 const struct hi6421_spmi_reg_info *sreg;164 165 sreg = container_of(rdev->desc, struct hi6421_spmi_reg_info, desc);166 167 if (!sreg->eco_uA || ((unsigned int)load_uA > sreg->eco_uA))168 return REGULATOR_MODE_NORMAL;169 170 return REGULATOR_MODE_IDLE;171}172 173static const struct regulator_ops hi6421_spmi_ldo_rops = {174 .is_enabled = regulator_is_enabled_regmap,175 .enable = hi6421_spmi_regulator_enable,176 .disable = regulator_disable_regmap,177 .list_voltage = regulator_list_voltage_table,178 .map_voltage = regulator_map_voltage_ascend,179 .get_voltage_sel = regulator_get_voltage_sel_regmap,180 .set_voltage_sel = regulator_set_voltage_sel_regmap,181 .get_mode = hi6421_spmi_regulator_get_mode,182 .set_mode = hi6421_spmi_regulator_set_mode,183 .get_optimum_mode = hi6421_spmi_regulator_get_optimum_mode,184};185 186/* HI6421v600 regulators with known registers */187enum hi6421_spmi_regulator_id {188 hi6421v600_ldo3,189 hi6421v600_ldo4,190 hi6421v600_ldo9,191 hi6421v600_ldo15,192 hi6421v600_ldo16,193 hi6421v600_ldo17,194 hi6421v600_ldo33,195 hi6421v600_ldo34,196};197 198static const struct hi6421_spmi_reg_info regulator_info[] = {199 HI6421V600_LDO(ldo3, range_1v5_to_2v0,200 0x16, 0x01, 0x51,201 20000, 120,202 0, 0),203 HI6421V600_LDO(ldo4, range_1v725_to_1v9,204 0x17, 0x01, 0x52,205 20000, 120,206 0x10, 10000),207 HI6421V600_LDO(ldo9, range_1v75_to_3v3,208 0x1c, 0x01, 0x57,209 20000, 360,210 0x10, 10000),211 HI6421V600_LDO(ldo15, range_1v8_to_3v0,212 0x21, 0x01, 0x5c,213 20000, 360,214 0x10, 10000),215 HI6421V600_LDO(ldo16, range_1v8_to_3v0,216 0x22, 0x01, 0x5d,217 20000, 360,218 0x10, 10000),219 HI6421V600_LDO(ldo17, range_2v5_to_3v3,220 0x23, 0x01, 0x5e,221 20000, 120,222 0x10, 10000),223 HI6421V600_LDO(ldo33, range_2v5_to_3v3,224 0x32, 0x01, 0x6d,225 20000, 120,226 0, 0),227 HI6421V600_LDO(ldo34, range_2v6_to_3v3,228 0x33, 0x01, 0x6e,229 20000, 120,230 0, 0),231};232 233static int hi6421_spmi_regulator_probe(struct platform_device *pdev)234{235 struct device *pmic_dev = pdev->dev.parent;236 struct regulator_config config = { };237 struct hi6421_spmi_reg_priv *priv;238 const struct hi6421_spmi_reg_info *info;239 struct device *dev = &pdev->dev;240 struct regmap *regmap;241 struct regulator_dev *rdev;242 int i;243 244 /*245 * This driver is meant to be called by hi6421-spmi-core,246 * which should first set drvdata. If this doesn't happen, hit247 * a warn on and return.248 */249 regmap = dev_get_drvdata(pmic_dev);250 if (WARN_ON(!regmap))251 return -ENODEV;252 253 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);254 if (!priv)255 return -ENOMEM;256 257 mutex_init(&priv->enable_mutex);258 259 for (i = 0; i < ARRAY_SIZE(regulator_info); i++) {260 info = ®ulator_info[i];261 262 config.dev = pdev->dev.parent;263 config.driver_data = priv;264 config.regmap = regmap;265 266 rdev = devm_regulator_register(dev, &info->desc, &config);267 if (IS_ERR(rdev)) {268 dev_err(dev, "failed to register %s\n",269 info->desc.name);270 return PTR_ERR(rdev);271 }272 }273 274 return 0;275}276 277static const struct platform_device_id hi6421_spmi_regulator_table[] = {278 { .name = "hi6421v600-regulator" },279 {},280};281MODULE_DEVICE_TABLE(platform, hi6421_spmi_regulator_table);282 283static struct platform_driver hi6421_spmi_regulator_driver = {284 .id_table = hi6421_spmi_regulator_table,285 .driver = {286 .name = "hi6421v600-regulator",287 .probe_type = PROBE_PREFER_ASYNCHRONOUS,288 },289 .probe = hi6421_spmi_regulator_probe,290};291module_platform_driver(hi6421_spmi_regulator_driver);292 293MODULE_DESCRIPTION("Hi6421v600 SPMI regulator driver");294MODULE_LICENSE("GPL v2");295 296