drivers/regulator/pbias-regulator.c

   1 /*
   2  * pbias-regulator.c
   3  *
   4  * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
   5  * Author: Balaji T K <balajitk@ti.com>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation version 2.
  10  *
  11  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  12  * kind, whether express or implied; without even the implied warranty
  13  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * 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 #include <linux/of_device.h>
  29
  30 struct pbias_reg_info {
  31         u32 enable;
  32         u32 enable_mask;
  33         u32 vmode;
  34         unsigned int enable_time;
  35         char *name;
  36 };
  37
  38 struct pbias_regulator_data {
  39         struct regulator_desc desc;
  40         void __iomem *pbias_addr;
  41         struct regulator_dev *dev;
  42         struct regmap *syscon;
  43         const struct pbias_reg_info *info;
  44         int voltage;
  45 };
  46
  47 static const unsigned int pbias_volt_table[] = {
  48         1800000,
  49         3000000
  50 };
  51
  52 static int pbias_regulator_enable(struct regulator_dev *rdev)
  53 {
  54         struct pbias_regulator_data *data = rdev_get_drvdata(rdev);
  55         const struct pbias_reg_info *info = data->info;
  56
  57         return regmap_update_bits(data->syscon, rdev->desc->enable_reg,
  58                                   info->enable_mask, info->enable);
  59 }
  60
  61 static int pbias_regulator_is_enable(struct regulator_dev *rdev)
  62 {
  63         struct pbias_regulator_data *data = rdev_get_drvdata(rdev);
  64         const struct pbias_reg_info *info = data->info;
  65         int value;
  66
  67         regmap_read(data->syscon, rdev->desc->enable_reg, &value);
  68
  69         return (value & info->enable_mask) == info->enable;
  70 }
  71
  72 static struct regulator_ops pbias_regulator_voltage_ops = {
  73         .list_voltage = regulator_list_voltage_table,
  74         .get_voltage_sel = regulator_get_voltage_sel_regmap,
  75         .set_voltage_sel = regulator_set_voltage_sel_regmap,
  76         .enable = pbias_regulator_enable,
  77         .disable = regulator_disable_regmap,
  78         .is_enabled = pbias_regulator_is_enable,
  79 };
  80
  81 static const struct pbias_reg_info pbias_mmc_omap2430 = {
  82         .enable = BIT(1),
  83         .enable_mask = BIT(1),
  84         .vmode = BIT(0),
  85         .enable_time = 100,
  86         .name = "pbias_mmc_omap2430"
  87 };
  88
  89 static const struct pbias_reg_info pbias_sim_omap3 = {
  90         .enable = BIT(9),
  91         .enable_mask = BIT(9),
  92         .vmode = BIT(8),
  93         .enable_time = 100,
  94         .name = "pbias_sim_omap3"
  95 };
  96
  97 static const struct pbias_reg_info pbias_mmc_omap4 = {
  98         .enable = BIT(26) | BIT(22),
  99         .enable_mask = BIT(26) | BIT(25) | BIT(22),
 100         .vmode = BIT(21),
 101         .enable_time = 100,
 102         .name = "pbias_mmc_omap4"
 103 };
 104
 105 static const struct pbias_reg_info pbias_mmc_omap5 = {
 106         .enable = BIT(27) | BIT(26),
 107         .enable_mask = BIT(27) | BIT(25) | BIT(26),
 108         .vmode = BIT(21),
 109         .enable_time = 100,
 110         .name = "pbias_mmc_omap5"
 111 };
 112
 113 static struct of_regulator_match pbias_matches[] = {
 114         { .name = "pbias_mmc_omap2430", .driver_data = (void *)&pbias_mmc_omap2430},
 115         { .name = "pbias_sim_omap3", .driver_data = (void *)&pbias_sim_omap3},
 116         { .name = "pbias_mmc_omap4", .driver_data = (void *)&pbias_mmc_omap4},
 117         { .name = "pbias_mmc_omap5", .driver_data = (void *)&pbias_mmc_omap5},
 118 };
 119 #define PBIAS_NUM_REGS  ARRAY_SIZE(pbias_matches)
 120
 121 static const struct of_device_id pbias_of_match[] = {
 122         { .compatible = "ti,pbias-omap", },
 123         {},
 124 };
 125 MODULE_DEVICE_TABLE(of, pbias_of_match);
 126
 127 static int pbias_regulator_probe(struct platform_device *pdev)
 128 {
 129         struct device_node *np = pdev->dev.of_node;
 130         struct pbias_regulator_data *drvdata;
 131         struct resource *res;
 132         struct regulator_config cfg = { };
 133         struct regmap *syscon;
 134         const struct pbias_reg_info *info;
 135         int ret = 0;
 136         int count, idx, data_idx = 0;
 137
 138         count = of_regulator_match(&pdev->dev, np, pbias_matches,
 139                                                 PBIAS_NUM_REGS);
 140         if (count < 0)
 141                 return count;
 142
 143         drvdata = devm_kzalloc(&pdev->dev, sizeof(struct pbias_regulator_data)
 144                                * count, GFP_KERNEL);
 145         if (drvdata == NULL) {
 146                 dev_err(&pdev->dev, "Failed to allocate device data\n");
 147                 return -ENOMEM;
 148         }
 149
 150         syscon = syscon_regmap_lookup_by_phandle(np, "syscon");
 151         if (IS_ERR(syscon))
 152                 return PTR_ERR(syscon);
 153
 154         cfg.regmap = syscon;
 155         cfg.dev = &pdev->dev;
 156
 157         for (idx = 0; idx < PBIAS_NUM_REGS && data_idx < count; idx++) {
 158                 if (!pbias_matches[idx].init_data ||
 159                         !pbias_matches[idx].of_node)
 160                         continue;
 161
 162                 info = pbias_matches[idx].driver_data;
 163                 if (!info)
 164                         return -ENODEV;
 165
 166                 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 167                 if (!res)
 168                         return -EINVAL;
 169
 170                 drvdata[data_idx].syscon = syscon;
 171                 drvdata[data_idx].info = info;
 172                 drvdata[data_idx].desc.name = info->name;
 173                 drvdata[data_idx].desc.owner = THIS_MODULE;
 174                 drvdata[data_idx].desc.type = REGULATOR_VOLTAGE;
 175                 drvdata[data_idx].desc.ops = &pbias_regulator_voltage_ops;
 176                 drvdata[data_idx].desc.volt_table = pbias_volt_table;
 177                 drvdata[data_idx].desc.n_voltages = 2;
 178                 drvdata[data_idx].desc.enable_time = info->enable_time;
 179                 drvdata[data_idx].desc.vsel_reg = res->start;
 180                 drvdata[data_idx].desc.vsel_mask = info->vmode;
 181                 drvdata[data_idx].desc.enable_reg = res->start;
 182                 drvdata[data_idx].desc.enable_mask = info->enable_mask;
 183
 184                 cfg.init_data = pbias_matches[idx].init_data;
 185                 cfg.driver_data = &drvdata[data_idx];
 186                 cfg.of_node = pbias_matches[idx].of_node;
 187
 188                 drvdata[data_idx].dev = devm_regulator_register(&pdev->dev,
 189                                         &drvdata[data_idx].desc, &cfg);
 190                 if (IS_ERR(drvdata[data_idx].dev)) {
 191                         ret = PTR_ERR(drvdata[data_idx].dev);
 192                         dev_err(&pdev->dev,
 193                                 "Failed to register regulator: %d\n", ret);
 194                         goto err_regulator;
 195                 }
 196                 data_idx++;
 197         }
 198
 199         platform_set_drvdata(pdev, drvdata);
 200
 201 err_regulator:
 202         return ret;
 203 }
 204
 205 static struct platform_driver pbias_regulator_driver = {
 206         .probe          = pbias_regulator_probe,
 207         .driver         = {
 208                 .name           = "pbias-regulator",
 209                 .owner          = THIS_MODULE,
 210                 .of_match_table = of_match_ptr(pbias_of_match),
 211         },
 212 };
 213
 214 module_platform_driver(pbias_regulator_driver);
 215
 216 MODULE_AUTHOR("Balaji T K <balajitk@ti.com>");
 217 MODULE_DESCRIPTION("pbias voltage regulator");
 218 MODULE_LICENSE("GPL");
 219 MODULE_ALIAS("platform:pbias-regulator");