kernel/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 struct regulator_ops pbias_regulator_voltage_ops = {
  53         .list_voltage = regulator_list_voltage_table,
  54         .get_voltage_sel = regulator_get_voltage_sel_regmap,
  55         .set_voltage_sel = regulator_set_voltage_sel_regmap,
  56         .enable = regulator_enable_regmap,
  57         .disable = regulator_disable_regmap,
  58         .is_enabled = regulator_is_enabled_regmap,
  59 };
  60
  61 static const struct pbias_reg_info pbias_mmc_omap2430 = {
  62         .enable = BIT(1),
  63         .enable_mask = BIT(1),
  64         .vmode = BIT(0),
  65         .enable_time = 100,
  66         .name = "pbias_mmc_omap2430"
  67 };
  68
  69 static const struct pbias_reg_info pbias_sim_omap3 = {
  70         .enable = BIT(9),
  71         .enable_mask = BIT(9),
  72         .vmode = BIT(8),
  73         .enable_time = 100,
  74         .name = "pbias_sim_omap3"
  75 };
  76
  77 static const struct pbias_reg_info pbias_mmc_omap4 = {
  78         .enable = BIT(26) | BIT(22),
  79         .enable_mask = BIT(26) | BIT(25) | BIT(22),
  80         .vmode = BIT(21),
  81         .enable_time = 100,
  82         .name = "pbias_mmc_omap4"
  83 };
  84
  85 static const struct pbias_reg_info pbias_mmc_omap5 = {
  86         .enable = BIT(27) | BIT(26),
  87         .enable_mask = BIT(27) | BIT(25) | BIT(26),
  88         .vmode = BIT(21),
  89         .enable_time = 100,
  90         .name = "pbias_mmc_omap5"
  91 };
  92
  93 static struct of_regulator_match pbias_matches[] = {
  94         { .name = "pbias_mmc_omap2430", .driver_data = (void *)&pbias_mmc_omap2430},
  95         { .name = "pbias_sim_omap3", .driver_data = (void *)&pbias_sim_omap3},
  96         { .name = "pbias_mmc_omap4", .driver_data = (void *)&pbias_mmc_omap4},
  97         { .name = "pbias_mmc_omap5", .driver_data = (void *)&pbias_mmc_omap5},
  98 };
  99 #define PBIAS_NUM_REGS  ARRAY_SIZE(pbias_matches)
 100
 101 static const struct of_device_id pbias_of_match[] = {
 102         { .compatible = "ti,pbias-omap", },
 103         {},
 104 };
 105 MODULE_DEVICE_TABLE(of, pbias_of_match);
 106
 107 static int pbias_regulator_probe(struct platform_device *pdev)
 108 {
 109         struct device_node *np = pdev->dev.of_node;
 110         struct pbias_regulator_data *drvdata;
 111         struct resource *res;
 112         struct regulator_config cfg = { };
 113         struct regmap *syscon;
 114         const struct pbias_reg_info *info;
 115         int ret = 0;
 116         int count, idx, data_idx = 0;
 117
 118         count = of_regulator_match(&pdev->dev, np, pbias_matches,
 119                                                 PBIAS_NUM_REGS);
 120         if (count < 0)
 121                 return count;
 122
 123         drvdata = devm_kzalloc(&pdev->dev, sizeof(struct pbias_regulator_data)
 124                                * count, GFP_KERNEL);
 125         if (!drvdata)
 126                 return -ENOMEM;
 127
 128         syscon = syscon_regmap_lookup_by_phandle(np, "syscon");
 129         if (IS_ERR(syscon))
 130                 return PTR_ERR(syscon);
 131
 132         cfg.regmap = syscon;
 133         cfg.dev = &pdev->dev;
 134
 135         for (idx = 0; idx < PBIAS_NUM_REGS && data_idx < count; idx++) {
 136                 if (!pbias_matches[idx].init_data ||
 137                         !pbias_matches[idx].of_node)
 138                         continue;
 139
 140                 info = pbias_matches[idx].driver_data;
 141                 if (!info)
 142                         return -ENODEV;
 143
 144                 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 145                 if (!res)
 146                         return -EINVAL;
 147
 148                 drvdata[data_idx].syscon = syscon;
 149                 drvdata[data_idx].info = info;
 150                 drvdata[data_idx].desc.name = info->name;
 151                 drvdata[data_idx].desc.owner = THIS_MODULE;
 152                 drvdata[data_idx].desc.type = REGULATOR_VOLTAGE;
 153                 drvdata[data_idx].desc.ops = &pbias_regulator_voltage_ops;
 154                 drvdata[data_idx].desc.volt_table = pbias_volt_table;
 155                 drvdata[data_idx].desc.n_voltages = 2;
 156                 drvdata[data_idx].desc.enable_time = info->enable_time;
 157                 drvdata[data_idx].desc.vsel_reg = res->start;
 158                 drvdata[data_idx].desc.vsel_mask = info->vmode;
 159                 drvdata[data_idx].desc.enable_reg = res->start;
 160                 drvdata[data_idx].desc.enable_mask = info->enable_mask;
 161                 drvdata[data_idx].desc.enable_val = info->enable;
 162
 163                 cfg.init_data = pbias_matches[idx].init_data;
 164                 cfg.driver_data = &drvdata[data_idx];
 165                 cfg.of_node = pbias_matches[idx].of_node;
 166
 167                 drvdata[data_idx].dev = devm_regulator_register(&pdev->dev,
 168                                         &drvdata[data_idx].desc, &cfg);
 169                 if (IS_ERR(drvdata[data_idx].dev)) {
 170                         ret = PTR_ERR(drvdata[data_idx].dev);
 171                         dev_err(&pdev->dev,
 172                                 "Failed to register regulator: %d\n", ret);
 173                         goto err_regulator;
 174                 }
 175                 data_idx++;
 176         }
 177
 178         platform_set_drvdata(pdev, drvdata);
 179
 180 err_regulator:
 181         return ret;
 182 }
 183
 184 static struct platform_driver pbias_regulator_driver = {
 185         .probe          = pbias_regulator_probe,
 186         .driver         = {
 187                 .name           = "pbias-regulator",
 188                 .of_match_table = of_match_ptr(pbias_of_match),
 189         },
 190 };
 191
 192 module_platform_driver(pbias_regulator_driver);
 193
 194 MODULE_AUTHOR("Balaji T K <balajitk@ti.com>");
 195 MODULE_DESCRIPTION("pbias voltage regulator");
 196 MODULE_LICENSE("GPL");
 197 MODULE_ALIAS("platform:pbias-regulator");