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 disable_val;
  34         u32 vmode;
  35         unsigned int enable_time;
  36         char *name;
  37 };
  38
  39 struct pbias_regulator_data {
  40         struct regulator_desc desc;
  41         void __iomem *pbias_addr;
  42         struct regulator_dev *dev;
  43         struct regmap *syscon;
  44         const struct pbias_reg_info *info;
  45         int voltage;
  46 };
  47
  48 static const unsigned int pbias_volt_table[] = {
  49         1800000,
  50         3000000
  51 };
  52
  53 static struct regulator_ops pbias_regulator_voltage_ops = {
  54         .list_voltage = regulator_list_voltage_table,
  55         .get_voltage_sel = regulator_get_voltage_sel_regmap,
  56         .set_voltage_sel = regulator_set_voltage_sel_regmap,
  57         .enable = regulator_enable_regmap,
  58         .disable = regulator_disable_regmap,
  59         .is_enabled = regulator_is_enabled_regmap,
  60 };
  61
  62 static const struct pbias_reg_info pbias_mmc_omap2430 = {
  63         .enable = BIT(1),
  64         .enable_mask = BIT(1),
  65         .vmode = BIT(0),
  66         .disable_val = 0,
  67         .enable_time = 100,
  68         .name = "pbias_mmc_omap2430"
  69 };
  70
  71 static const struct pbias_reg_info pbias_sim_omap3 = {
  72         .enable = BIT(9),
  73         .enable_mask = BIT(9),
  74         .vmode = BIT(8),
  75         .enable_time = 100,
  76         .name = "pbias_sim_omap3"
  77 };
  78
  79 static const struct pbias_reg_info pbias_mmc_omap4 = {
  80         .enable = BIT(26) | BIT(22),
  81         .enable_mask = BIT(26) | BIT(25) | BIT(22),
  82         .disable_val = BIT(25),
  83         .vmode = BIT(21),
  84         .enable_time = 100,
  85         .name = "pbias_mmc_omap4"
  86 };
  87
  88 static const struct pbias_reg_info pbias_mmc_omap5 = {
  89         .enable = BIT(27) | BIT(26),
  90         .enable_mask = BIT(27) | BIT(25) | BIT(26),
  91         .disable_val = BIT(25),
  92         .vmode = BIT(21),
  93         .enable_time = 100,
  94         .name = "pbias_mmc_omap5"
  95 };
  96
  97 static struct of_regulator_match pbias_matches[] = {
  98         { .name = "pbias_mmc_omap2430", .driver_data = (void *)&pbias_mmc_omap2430},
  99         { .name = "pbias_sim_omap3", .driver_data = (void *)&pbias_sim_omap3},
 100         { .name = "pbias_mmc_omap4", .driver_data = (void *)&pbias_mmc_omap4},
 101         { .name = "pbias_mmc_omap5", .driver_data = (void *)&pbias_mmc_omap5},
 102 };
 103 #define PBIAS_NUM_REGS  ARRAY_SIZE(pbias_matches)
 104
 105 static const struct of_device_id pbias_of_match[] = {
 106         { .compatible = "ti,pbias-omap", },
 107         {},
 108 };
 109 MODULE_DEVICE_TABLE(of, pbias_of_match);
 110
 111 static int pbias_regulator_probe(struct platform_device *pdev)
 112 {
 113         struct device_node *np = pdev->dev.of_node;
 114         struct pbias_regulator_data *drvdata;
 115         struct resource *res;
 116         struct regulator_config cfg = { };
 117         struct regmap *syscon;
 118         const struct pbias_reg_info *info;
 119         int ret = 0;
 120         int count, idx, data_idx = 0;
 121
 122         count = of_regulator_match(&pdev->dev, np, pbias_matches,
 123                                                 PBIAS_NUM_REGS);
 124         if (count < 0)
 125                 return count;
 126
 127         drvdata = devm_kzalloc(&pdev->dev, sizeof(struct pbias_regulator_data)
 128                                * count, GFP_KERNEL);
 129         if (!drvdata)
 130                 return -ENOMEM;
 131
 132         syscon = syscon_regmap_lookup_by_phandle(np, "syscon");
 133         if (IS_ERR(syscon))
 134                 return PTR_ERR(syscon);
 135
 136         cfg.regmap = syscon;
 137         cfg.dev = &pdev->dev;
 138
 139         for (idx = 0; idx < PBIAS_NUM_REGS && data_idx < count; idx++) {
 140                 if (!pbias_matches[idx].init_data ||
 141                         !pbias_matches[idx].of_node)
 142                         continue;
 143
 144                 info = pbias_matches[idx].driver_data;
 145                 if (!info)
 146                         return -ENODEV;
 147
 148                 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 149                 if (!res)
 150                         return -EINVAL;
 151
 152                 drvdata[data_idx].syscon = syscon;
 153                 drvdata[data_idx].info = info;
 154                 drvdata[data_idx].desc.name = info->name;
 155                 drvdata[data_idx].desc.owner = THIS_MODULE;
 156                 drvdata[data_idx].desc.type = REGULATOR_VOLTAGE;
 157                 drvdata[data_idx].desc.ops = &pbias_regulator_voltage_ops;
 158                 drvdata[data_idx].desc.volt_table = pbias_volt_table;
 159                 drvdata[data_idx].desc.n_voltages = 2;
 160                 drvdata[data_idx].desc.enable_time = info->enable_time;
 161                 drvdata[data_idx].desc.vsel_reg = res->start;
 162                 drvdata[data_idx].desc.vsel_mask = info->vmode;
 163                 drvdata[data_idx].desc.enable_reg = res->start;
 164                 drvdata[data_idx].desc.enable_mask = info->enable_mask;
 165                 drvdata[data_idx].desc.enable_val = info->enable;
 166                 drvdata[data_idx].desc.disable_val = info->disable_val;
 167
 168                 cfg.init_data = pbias_matches[idx].init_data;
 169                 cfg.driver_data = &drvdata[data_idx];
 170                 cfg.of_node = pbias_matches[idx].of_node;
 171
 172                 drvdata[data_idx].dev = devm_regulator_register(&pdev->dev,
 173                                         &drvdata[data_idx].desc, &cfg);
 174                 if (IS_ERR(drvdata[data_idx].dev)) {
 175                         ret = PTR_ERR(drvdata[data_idx].dev);
 176                         dev_err(&pdev->dev,
 177                                 "Failed to register regulator: %d\n", ret);
 178                         goto err_regulator;
 179                 }
 180                 data_idx++;
 181         }
 182
 183         platform_set_drvdata(pdev, drvdata);
 184
 185 err_regulator:
 186         return ret;
 187 }
 188
 189 static struct platform_driver pbias_regulator_driver = {
 190         .probe          = pbias_regulator_probe,
 191         .driver         = {
 192                 .name           = "pbias-regulator",
 193                 .of_match_table = of_match_ptr(pbias_of_match),
 194         },
 195 };
 196
 197 module_platform_driver(pbias_regulator_driver);
 198
 199 MODULE_AUTHOR("Balaji T K <balajitk@ti.com>");
 200 MODULE_DESCRIPTION("pbias voltage regulator");
 201 MODULE_LICENSE("GPL");
 202 MODULE_ALIAS("platform:pbias-regulator");