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 struct pbias_of_data {
  49         unsigned int offset;
  50 };
  51
  52 static const unsigned int pbias_volt_table[] = {
  53         1800000,
  54         3000000
  55 };
  56
  57 static const struct regulator_ops pbias_regulator_voltage_ops = {
  58         .list_voltage = regulator_list_voltage_table,
  59         .get_voltage_sel = regulator_get_voltage_sel_regmap,
  60         .set_voltage_sel = regulator_set_voltage_sel_regmap,
  61         .enable = regulator_enable_regmap,
  62         .disable = regulator_disable_regmap,
  63         .is_enabled = regulator_is_enabled_regmap,
  64 };
  65
  66 static const struct pbias_reg_info pbias_mmc_omap2430 = {
  67         .enable = BIT(1),
  68         .enable_mask = BIT(1),
  69         .vmode = BIT(0),
  70         .disable_val = 0,
  71         .enable_time = 100,
  72         .name = "pbias_mmc_omap2430"
  73 };
  74
  75 static const struct pbias_reg_info pbias_sim_omap3 = {
  76         .enable = BIT(9),
  77         .enable_mask = BIT(9),
  78         .vmode = BIT(8),
  79         .enable_time = 100,
  80         .name = "pbias_sim_omap3"
  81 };
  82
  83 static const struct pbias_reg_info pbias_mmc_omap4 = {
  84         .enable = BIT(26) | BIT(22),
  85         .enable_mask = BIT(26) | BIT(25) | BIT(22),
  86         .disable_val = BIT(25),
  87         .vmode = BIT(21),
  88         .enable_time = 100,
  89         .name = "pbias_mmc_omap4"
  90 };
  91
  92 static const struct pbias_reg_info pbias_mmc_omap5 = {
  93         .enable = BIT(27) | BIT(26),
  94         .enable_mask = BIT(27) | BIT(25) | BIT(26),
  95         .disable_val = BIT(25),
  96         .vmode = BIT(21),
  97         .enable_time = 100,
  98         .name = "pbias_mmc_omap5"
  99 };
 100
 101 static struct of_regulator_match pbias_matches[] = {
 102         { .name = "pbias_mmc_omap2430", .driver_data = (void *)&pbias_mmc_omap2430},
 103         { .name = "pbias_sim_omap3", .driver_data = (void *)&pbias_sim_omap3},
 104         { .name = "pbias_mmc_omap4", .driver_data = (void *)&pbias_mmc_omap4},
 105         { .name = "pbias_mmc_omap5", .driver_data = (void *)&pbias_mmc_omap5},
 106 };
 107 #define PBIAS_NUM_REGS  ARRAY_SIZE(pbias_matches)
 108
 109 /* Offset from SCM general area (and syscon) base */
 110
 111 static const struct pbias_of_data pbias_of_data_omap2 = {
 112         .offset = 0x230,
 113 };
 114
 115 static const struct pbias_of_data pbias_of_data_omap3 = {
 116         .offset = 0x2b0,
 117 };
 118
 119 static const struct pbias_of_data pbias_of_data_omap4 = {
 120         .offset = 0x60,
 121 };
 122
 123 static const struct pbias_of_data pbias_of_data_omap5 = {
 124         .offset = 0x60,
 125 };
 126
 127 static const struct pbias_of_data pbias_of_data_dra7 = {
 128         .offset = 0xe00,
 129 };
 130
 131 static const struct of_device_id pbias_of_match[] = {
 132         { .compatible = "ti,pbias-omap", },
 133         { .compatible = "ti,pbias-omap2", .data = &pbias_of_data_omap2, },
 134         { .compatible = "ti,pbias-omap3", .data = &pbias_of_data_omap3, },
 135         { .compatible = "ti,pbias-omap4", .data = &pbias_of_data_omap4, },
 136         { .compatible = "ti,pbias-omap5", .data = &pbias_of_data_omap5, },
 137         { .compatible = "ti,pbias-dra7", .data = &pbias_of_data_dra7, },
 138         {},
 139 };
 140 MODULE_DEVICE_TABLE(of, pbias_of_match);
 141
 142 static int pbias_regulator_probe(struct platform_device *pdev)
 143 {
 144         struct device_node *np = pdev->dev.of_node;
 145         struct pbias_regulator_data *drvdata;
 146         struct resource *res;
 147         struct regulator_config cfg = { };
 148         struct regmap *syscon;
 149         const struct pbias_reg_info *info;
 150         int ret = 0;
 151         int count, idx, data_idx = 0;
 152         const struct of_device_id *match;
 153         const struct pbias_of_data *data;
 154         unsigned int offset;
 155
 156         count = of_regulator_match(&pdev->dev, np, pbias_matches,
 157                                                 PBIAS_NUM_REGS);
 158         if (count < 0)
 159                 return count;
 160
 161         drvdata = devm_kzalloc(&pdev->dev, sizeof(struct pbias_regulator_data)
 162                                * count, GFP_KERNEL);
 163         if (!drvdata)
 164                 return -ENOMEM;
 165
 166         syscon = syscon_regmap_lookup_by_phandle(np, "syscon");
 167         if (IS_ERR(syscon))
 168                 return PTR_ERR(syscon);
 169
 170         match = of_match_device(of_match_ptr(pbias_of_match), &pdev->dev);
 171         if (match && match->data) {
 172                 data = match->data;
 173                 offset = data->offset;
 174         } else {
 175                 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 176                 if (!res)
 177                         return -EINVAL;
 178
 179                 offset = res->start;
 180                 dev_WARN(&pdev->dev,
 181                          "using legacy dt data for pbias offset\n");
 182         }
 183
 184         cfg.regmap = syscon;
 185         cfg.dev = &pdev->dev;
 186
 187         for (idx = 0; idx < PBIAS_NUM_REGS && data_idx < count; idx++) {
 188                 if (!pbias_matches[idx].init_data ||
 189                         !pbias_matches[idx].of_node)
 190                         continue;
 191
 192                 info = pbias_matches[idx].driver_data;
 193                 if (!info)
 194                         return -ENODEV;
 195
 196                 drvdata[data_idx].syscon = syscon;
 197                 drvdata[data_idx].info = info;
 198                 drvdata[data_idx].desc.name = info->name;
 199                 drvdata[data_idx].desc.owner = THIS_MODULE;
 200                 drvdata[data_idx].desc.type = REGULATOR_VOLTAGE;
 201                 drvdata[data_idx].desc.ops = &pbias_regulator_voltage_ops;
 202                 drvdata[data_idx].desc.volt_table = pbias_volt_table;
 203                 drvdata[data_idx].desc.n_voltages = 2;
 204                 drvdata[data_idx].desc.enable_time = info->enable_time;
 205                 drvdata[data_idx].desc.vsel_reg = offset;
 206                 drvdata[data_idx].desc.vsel_mask = info->vmode;
 207                 drvdata[data_idx].desc.enable_reg = offset;
 208                 drvdata[data_idx].desc.enable_mask = info->enable_mask;
 209                 drvdata[data_idx].desc.enable_val = info->enable;
 210                 drvdata[data_idx].desc.disable_val = info->disable_val;
 211
 212                 cfg.init_data = pbias_matches[idx].init_data;
 213                 cfg.driver_data = &drvdata[data_idx];
 214                 cfg.of_node = pbias_matches[idx].of_node;
 215
 216                 drvdata[data_idx].dev = devm_regulator_register(&pdev->dev,
 217                                         &drvdata[data_idx].desc, &cfg);
 218                 if (IS_ERR(drvdata[data_idx].dev)) {
 219                         ret = PTR_ERR(drvdata[data_idx].dev);
 220                         dev_err(&pdev->dev,
 221                                 "Failed to register regulator: %d\n", ret);
 222                         goto err_regulator;
 223                 }
 224                 data_idx++;
 225         }
 226
 227         platform_set_drvdata(pdev, drvdata);
 228
 229 err_regulator:
 230         return ret;
 231 }
 232
 233 static struct platform_driver pbias_regulator_driver = {
 234         .probe          = pbias_regulator_probe,
 235         .driver         = {
 236                 .name           = "pbias-regulator",
 237                 .of_match_table = of_match_ptr(pbias_of_match),
 238         },
 239 };
 240
 241 module_platform_driver(pbias_regulator_driver);
 242
 243 MODULE_AUTHOR("Balaji T K <balajitk@ti.com>");
 244 MODULE_DESCRIPTION("pbias voltage regulator");
 245 MODULE_LICENSE("GPL");
 246 MODULE_ALIAS("platform:pbias-regulator");