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         unsigned int pbias_reg;
  42         struct regulator_dev *dev;
  43         struct regmap *syscon;
  44         const struct pbias_reg_info *info;
  45         int voltage;
  46 };
  47
  48 static int pbias_regulator_set_voltage(struct regulator_dev *dev,
  49                         int min_uV, int max_uV, unsigned *selector)
  50 {
  51         struct pbias_regulator_data *data = rdev_get_drvdata(dev);
  52         const struct pbias_reg_info *info = data->info;
  53         int ret, vmode;
  54
  55         if (min_uV <= 1800000)
  56                 vmode = 0;
  57         else if (min_uV > 1800000)
  58                 vmode = info->vmode;
  59
  60         ret = regmap_update_bits(data->syscon, data->pbias_reg,
  61                                                 info->vmode, vmode);
  62
  63         return ret;
  64 }
  65
  66 static int pbias_regulator_get_voltage(struct regulator_dev *rdev)
  67 {
  68         struct pbias_regulator_data *data = rdev_get_drvdata(rdev);
  69         const struct pbias_reg_info *info = data->info;
  70         int value, voltage;
  71
  72         regmap_read(data->syscon, data->pbias_reg, &value);
  73         value &= info->vmode;
  74
  75         voltage = value ? 3000000 : 1800000;
  76
  77         return voltage;
  78 }
  79
  80 static int pbias_regulator_enable(struct regulator_dev *rdev)
  81 {
  82         struct pbias_regulator_data *data = rdev_get_drvdata(rdev);
  83         const struct pbias_reg_info *info = data->info;
  84         int ret;
  85
  86         ret = regmap_update_bits(data->syscon, data->pbias_reg,
  87                                         info->enable_mask, info->enable);
  88
  89         return ret;
  90 }
  91
  92 static int pbias_regulator_disable(struct regulator_dev *rdev)
  93 {
  94         struct pbias_regulator_data *data = rdev_get_drvdata(rdev);
  95         const struct pbias_reg_info *info = data->info;
  96         int ret;
  97
  98         ret = regmap_update_bits(data->syscon, data->pbias_reg,
  99                                                 info->enable_mask, 0);
 100         return ret;
 101 }
 102
 103 static int pbias_regulator_is_enable(struct regulator_dev *rdev)
 104 {
 105         struct pbias_regulator_data *data = rdev_get_drvdata(rdev);
 106         const struct pbias_reg_info *info = data->info;
 107         int value;
 108
 109         regmap_read(data->syscon, data->pbias_reg, &value);
 110
 111         return (value & info->enable_mask) == info->enable_mask;
 112 }
 113
 114 static struct regulator_ops pbias_regulator_voltage_ops = {
 115         .set_voltage    = pbias_regulator_set_voltage,
 116         .get_voltage    = pbias_regulator_get_voltage,
 117         .enable         = pbias_regulator_enable,
 118         .disable        = pbias_regulator_disable,
 119         .is_enabled     = pbias_regulator_is_enable,
 120 };
 121
 122 static const struct pbias_reg_info pbias_mmc_omap2430 = {
 123         .enable = BIT(1),
 124         .enable_mask = BIT(1),
 125         .vmode = BIT(0),
 126         .enable_time = 100,
 127         .name = "pbias_mmc_omap2430"
 128 };
 129
 130 static const struct pbias_reg_info pbias_sim_omap3 = {
 131         .enable = BIT(9),
 132         .enable_mask = BIT(9),
 133         .vmode = BIT(8),
 134         .enable_time = 100,
 135         .name = "pbias_sim_omap3"
 136 };
 137
 138 static const struct pbias_reg_info pbias_mmc_omap4 = {
 139         .enable = BIT(26) | BIT(22),
 140         .enable_mask = BIT(26) | BIT(25) | BIT(22),
 141         .vmode = BIT(21),
 142         .enable_time = 100,
 143         .name = "pbias_mmc_omap4"
 144 };
 145
 146 static const struct pbias_reg_info pbias_mmc_omap5 = {
 147         .enable = BIT(27) | BIT(26),
 148         .enable_mask = BIT(27) | BIT(25) | BIT(26),
 149         .vmode = BIT(21),
 150         .enable_time = 100,
 151         .name = "pbias_mmc_omap5"
 152 };
 153
 154 static struct of_regulator_match pbias_matches[] = {
 155         { .name = "pbias_mmc_omap2430", .driver_data = (void *)&pbias_mmc_omap2430},
 156         { .name = "pbias_sim_omap3", .driver_data = (void *)&pbias_sim_omap3},
 157         { .name = "pbias_mmc_omap4", .driver_data = (void *)&pbias_mmc_omap4},
 158         { .name = "pbias_mmc_omap5", .driver_data = (void *)&pbias_mmc_omap5},
 159 };
 160 #define PBIAS_NUM_REGS  ARRAY_SIZE(pbias_matches)
 161
 162 static const struct of_device_id pbias_of_match[] = {
 163         { .compatible = "ti,pbias-omap", },
 164         {},
 165 };
 166 MODULE_DEVICE_TABLE(of, pbias_of_match);
 167
 168 static int pbias_regulator_probe(struct platform_device *pdev)
 169 {
 170         struct device_node *np = pdev->dev.of_node;
 171         struct pbias_regulator_data *drvdata;
 172         struct resource *res;
 173         struct regulator_config cfg = { };
 174         struct regmap *syscon;
 175         const struct pbias_reg_info *info;
 176         int ret = 0;
 177         int count, idx, data_idx = 0;
 178
 179         count = of_regulator_match(&pdev->dev, np, pbias_matches,
 180                                                 PBIAS_NUM_REGS);
 181         if (count < 0)
 182                 return count;
 183
 184         drvdata = devm_kzalloc(&pdev->dev, sizeof(struct pbias_regulator_data)
 185                                * count, GFP_KERNEL);
 186         if (drvdata == NULL) {
 187                 dev_err(&pdev->dev, "Failed to allocate device data\n");
 188                 return -ENOMEM;
 189         }
 190
 191         syscon = syscon_regmap_lookup_by_phandle(np, "syscon");
 192         if (IS_ERR(syscon))
 193                 return PTR_ERR(syscon);
 194
 195         cfg.dev = &pdev->dev;
 196
 197         for (idx = 0; idx < PBIAS_NUM_REGS && data_idx < count; idx++) {
 198                 if (!pbias_matches[idx].init_data ||
 199                         !pbias_matches[idx].of_node)
 200                         continue;
 201
 202                 info = pbias_matches[idx].driver_data;
 203                 if (!info)
 204                         return -ENODEV;
 205
 206                 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 207                 if (!res)
 208                         return -EINVAL;
 209
 210                 drvdata[data_idx].pbias_reg = res->start;
 211                 drvdata[data_idx].syscon = syscon;
 212                 drvdata[data_idx].info = info;
 213                 drvdata[data_idx].desc.name = info->name;
 214                 drvdata[data_idx].desc.owner = THIS_MODULE;
 215                 drvdata[data_idx].desc.type = REGULATOR_VOLTAGE;
 216                 drvdata[data_idx].desc.ops = &pbias_regulator_voltage_ops;
 217                 drvdata[data_idx].desc.n_voltages = 2;
 218                 drvdata[data_idx].desc.enable_time = info->enable_time;
 219
 220                 cfg.init_data = pbias_matches[idx].init_data;
 221                 cfg.driver_data = &drvdata[data_idx];
 222                 cfg.of_node = pbias_matches[idx].of_node;
 223
 224                 drvdata[data_idx].dev = devm_regulator_register(&pdev->dev,
 225                                         &drvdata[data_idx].desc, &cfg);
 226                 if (IS_ERR(drvdata[data_idx].dev)) {
 227                         ret = PTR_ERR(drvdata[data_idx].dev);
 228                         dev_err(&pdev->dev,
 229                                 "Failed to register regulator: %d\n", ret);
 230                         goto err_regulator;
 231                 }
 232                 data_idx++;
 233         }
 234
 235         platform_set_drvdata(pdev, drvdata);
 236
 237 err_regulator:
 238         return ret;
 239 }
 240
 241 static struct platform_driver pbias_regulator_driver = {
 242         .probe          = pbias_regulator_probe,
 243         .driver         = {
 244                 .name           = "pbias-regulator",
 245                 .owner          = THIS_MODULE,
 246                 .of_match_table = of_match_ptr(pbias_of_match),
 247         },
 248 };
 249
 250 module_platform_driver(pbias_regulator_driver);
 251
 252 MODULE_AUTHOR("Balaji T K <balajitk@ti.com>");
 253 MODULE_DESCRIPTION("pbias voltage regulator");
 254 MODULE_LICENSE("GPL");
 255 MODULE_ALIAS("platform:pbias-regulator");