244 lines · c
1/*2 * pbias-regulator.c3 *4 * Copyright (C) 2014 Texas Instruments Incorporated - https://www.ti.com/5 * Author: Balaji T K <balajitk@ti.com>6 *7 * This program is free software; you can redistribute it and/or8 * modify it under the terms of the GNU General Public License as9 * published by the Free Software Foundation version 2.10 *11 * This program is distributed "as is" WITHOUT ANY WARRANTY of any12 * kind, whether express or implied; without even the implied warranty13 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the14 * GNU General Public License for more details.15 */16 17#include <linux/err.h>18#include <linux/io.h>19#include <linux/module.h>20#include <linux/mfd/syscon.h>21#include <linux/platform_device.h>22#include <linux/regulator/driver.h>23#include <linux/regulator/machine.h>24#include <linux/regulator/of_regulator.h>25#include <linux/regmap.h>26#include <linux/slab.h>27#include <linux/of.h>28 29struct pbias_reg_info {30 u32 enable;31 u32 enable_mask;32 u32 disable_val;33 u32 vmode;34 unsigned int enable_time;35 char *name;36 const unsigned int *pbias_volt_table;37 int n_voltages;38};39 40struct pbias_of_data {41 unsigned int offset;42};43 44static const unsigned int pbias_volt_table_3_0V[] = {45 1800000,46 300000047};48 49static const unsigned int pbias_volt_table_3_3V[] = {50 1800000,51 330000052};53 54static const struct regulator_ops pbias_regulator_voltage_ops = {55 .list_voltage = regulator_list_voltage_table,56 .get_voltage_sel = regulator_get_voltage_sel_regmap,57 .set_voltage_sel = regulator_set_voltage_sel_regmap,58 .enable = regulator_enable_regmap,59 .disable = regulator_disable_regmap,60 .is_enabled = regulator_is_enabled_regmap,61};62 63static const struct pbias_reg_info pbias_mmc_omap2430 = {64 .enable = BIT(1),65 .enable_mask = BIT(1),66 .vmode = BIT(0),67 .disable_val = 0,68 .enable_time = 100,69 .pbias_volt_table = pbias_volt_table_3_0V,70 .n_voltages = 2,71 .name = "pbias_mmc_omap2430"72};73 74static const struct pbias_reg_info pbias_sim_omap3 = {75 .enable = BIT(9),76 .enable_mask = BIT(9),77 .vmode = BIT(8),78 .enable_time = 100,79 .pbias_volt_table = pbias_volt_table_3_0V,80 .n_voltages = 2,81 .name = "pbias_sim_omap3"82};83 84static const struct pbias_reg_info pbias_mmc_omap4 = {85 .enable = BIT(26) | BIT(22),86 .enable_mask = BIT(26) | BIT(25) | BIT(22),87 .disable_val = BIT(25),88 .vmode = BIT(21),89 .enable_time = 100,90 .pbias_volt_table = pbias_volt_table_3_0V,91 .n_voltages = 2,92 .name = "pbias_mmc_omap4"93};94 95static const struct pbias_reg_info pbias_mmc_omap5 = {96 .enable = BIT(27) | BIT(26),97 .enable_mask = BIT(27) | BIT(25) | BIT(26),98 .disable_val = BIT(25),99 .vmode = BIT(21),100 .enable_time = 100,101 .pbias_volt_table = pbias_volt_table_3_3V,102 .n_voltages = 2,103 .name = "pbias_mmc_omap5"104};105 106static struct of_regulator_match pbias_matches[] = {107 { .name = "pbias_mmc_omap2430", .driver_data = (void *)&pbias_mmc_omap2430},108 { .name = "pbias_sim_omap3", .driver_data = (void *)&pbias_sim_omap3},109 { .name = "pbias_mmc_omap4", .driver_data = (void *)&pbias_mmc_omap4},110 { .name = "pbias_mmc_omap5", .driver_data = (void *)&pbias_mmc_omap5},111};112#define PBIAS_NUM_REGS ARRAY_SIZE(pbias_matches)113 114/* Offset from SCM general area (and syscon) base */115 116static const struct pbias_of_data pbias_of_data_omap2 = {117 .offset = 0x230,118};119 120static const struct pbias_of_data pbias_of_data_omap3 = {121 .offset = 0x2b0,122};123 124static const struct pbias_of_data pbias_of_data_omap4 = {125 .offset = 0x60,126};127 128static const struct pbias_of_data pbias_of_data_omap5 = {129 .offset = 0x60,130};131 132static const struct pbias_of_data pbias_of_data_dra7 = {133 .offset = 0xe00,134};135 136static const struct of_device_id pbias_of_match[] = {137 { .compatible = "ti,pbias-omap", },138 { .compatible = "ti,pbias-omap2", .data = &pbias_of_data_omap2, },139 { .compatible = "ti,pbias-omap3", .data = &pbias_of_data_omap3, },140 { .compatible = "ti,pbias-omap4", .data = &pbias_of_data_omap4, },141 { .compatible = "ti,pbias-omap5", .data = &pbias_of_data_omap5, },142 { .compatible = "ti,pbias-dra7", .data = &pbias_of_data_dra7, },143 {},144};145MODULE_DEVICE_TABLE(of, pbias_of_match);146 147static int pbias_regulator_probe(struct platform_device *pdev)148{149 struct device_node *np = pdev->dev.of_node;150 struct resource *res;151 struct regulator_config cfg = { };152 struct regulator_desc *desc;153 struct regulator_dev *rdev;154 struct regmap *syscon;155 const struct pbias_reg_info *info;156 int ret, count, idx;157 const struct pbias_of_data *data;158 unsigned int offset;159 160 count = of_regulator_match(&pdev->dev, np, pbias_matches,161 PBIAS_NUM_REGS);162 if (count < 0)163 return count;164 165 desc = devm_kcalloc(&pdev->dev, count, sizeof(*desc), GFP_KERNEL);166 if (!desc)167 return -ENOMEM;168 169 syscon = syscon_regmap_lookup_by_phandle(np, "syscon");170 if (IS_ERR(syscon))171 return PTR_ERR(syscon);172 173 data = of_device_get_match_data(&pdev->dev);174 if (data) {175 offset = data->offset;176 } else {177 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);178 if (!res)179 return -EINVAL;180 181 offset = res->start;182 dev_WARN(&pdev->dev,183 "using legacy dt data for pbias offset\n");184 }185 186 cfg.regmap = syscon;187 cfg.dev = &pdev->dev;188 189 for (idx = 0; idx < PBIAS_NUM_REGS && count; idx++) {190 if (!pbias_matches[idx].init_data ||191 !pbias_matches[idx].of_node)192 continue;193 194 info = pbias_matches[idx].driver_data;195 if (!info)196 return -ENODEV;197 198 desc->name = info->name;199 desc->owner = THIS_MODULE;200 desc->type = REGULATOR_VOLTAGE;201 desc->ops = &pbias_regulator_voltage_ops;202 desc->volt_table = info->pbias_volt_table;203 desc->n_voltages = info->n_voltages;204 desc->enable_time = info->enable_time;205 desc->vsel_reg = offset;206 desc->vsel_mask = info->vmode;207 desc->enable_reg = offset;208 desc->enable_mask = info->enable_mask;209 desc->enable_val = info->enable;210 desc->disable_val = info->disable_val;211 212 cfg.init_data = pbias_matches[idx].init_data;213 cfg.of_node = pbias_matches[idx].of_node;214 215 rdev = devm_regulator_register(&pdev->dev, desc, &cfg);216 if (IS_ERR(rdev)) {217 ret = PTR_ERR(rdev);218 dev_err(&pdev->dev,219 "Failed to register regulator: %d\n", ret);220 return ret;221 }222 desc++;223 count--;224 }225 226 return 0;227}228 229static struct platform_driver pbias_regulator_driver = {230 .probe = pbias_regulator_probe,231 .driver = {232 .name = "pbias-regulator",233 .probe_type = PROBE_PREFER_ASYNCHRONOUS,234 .of_match_table = of_match_ptr(pbias_of_match),235 },236};237 238module_platform_driver(pbias_regulator_driver);239 240MODULE_AUTHOR("Balaji T K <balajitk@ti.com>");241MODULE_DESCRIPTION("pbias voltage regulator");242MODULE_LICENSE("GPL");243MODULE_ALIAS("platform:pbias-regulator");244