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         const unsigned int *pbias_volt_table;
  38         int n_voltages;
  39 };
  40
  41 struct pbias_regulator_data {
  42         struct regulator_desc desc;
  43         void __iomem *pbias_addr;
  44         struct regulator_dev *dev;
  45         struct regmap *syscon;
  46         const struct pbias_reg_info *info;
  47         int voltage;
  48 };
  49
  50 struct pbias_of_data {
  51         unsigned int offset;
  52 };
  53
  54 static const unsigned int pbias_volt_table_3_0V[] = {
  55         1800000,
  56         3000000
  57 };
  58
  59 static const unsigned int pbias_volt_table_3_3V[] = {
  60         1800000,
  61         3300000
  62 };
  63
  64 static const struct regulator_ops pbias_regulator_voltage_ops = {
  65         .list_voltage = regulator_list_voltage_table,
  66         .get_voltage_sel = regulator_get_voltage_sel_regmap,
  67         .set_voltage_sel = regulator_set_voltage_sel_regmap,
  68         .enable = regulator_enable_regmap,
  69         .disable = regulator_disable_regmap,
  70         .is_enabled = regulator_is_enabled_regmap,
  71 };
  72
  73 static const struct pbias_reg_info pbias_mmc_omap2430 = {
  74         .enable = BIT(1),
  75         .enable_mask = BIT(1),
  76         .vmode = BIT(0),
  77         .disable_val = 0,
  78         .enable_time = 100,
  79         .pbias_volt_table = pbias_volt_table_3_0V,
  80         .n_voltages = 2,
  81         .name = "pbias_mmc_omap2430"
  82 };
  83
  84 static const struct pbias_reg_info pbias_sim_omap3 = {
  85         .enable = BIT(9),
  86         .enable_mask = BIT(9),
  87         .vmode = BIT(8),
  88         .enable_time = 100,
  89         .pbias_volt_table = pbias_volt_table_3_0V,
  90         .n_voltages = 2,
  91         .name = "pbias_sim_omap3"
  92 };
  93
  94 static const struct pbias_reg_info pbias_mmc_omap4 = {
  95         .enable = BIT(26) | BIT(22),
  96         .enable_mask = BIT(26) | BIT(25) | BIT(22),
  97         .disable_val = BIT(25),
  98         .vmode = BIT(21),
  99         .enable_time = 100,
 100         .pbias_volt_table = pbias_volt_table_3_0V,
 101         .n_voltages = 2,
 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         .disable_val = BIT(25),
 109         .vmode = BIT(21),
 110         .enable_time = 100,
 111         .pbias_volt_table = pbias_volt_table_3_3V,
 112         .n_voltages = 2,
 113         .name = "pbias_mmc_omap5"
 114 };
 115
 116 static struct of_regulator_match pbias_matches[] = {
 117         { .name = "pbias_mmc_omap2430", .driver_data = (void *)&pbias_mmc_omap2430},
 118         { .name = "pbias_sim_omap3", .driver_data = (void *)&pbias_sim_omap3},
 119         { .name = "pbias_mmc_omap4", .driver_data = (void *)&pbias_mmc_omap4},
 120         { .name = "pbias_mmc_omap5", .driver_data = (void *)&pbias_mmc_omap5},
 121 };
 122 #define PBIAS_NUM_REGS  ARRAY_SIZE(pbias_matches)
 123
 124 /* Offset from SCM general area (and syscon) base */
 125
 126 static const struct pbias_of_data pbias_of_data_omap2 = {
 127         .offset = 0x230,
 128 };
 129
 130 static const struct pbias_of_data pbias_of_data_omap3 = {
 131         .offset = 0x2b0,
 132 };
 133
 134 static const struct pbias_of_data pbias_of_data_omap4 = {
 135         .offset = 0x60,
 136 };
 137
 138 static const struct pbias_of_data pbias_of_data_omap5 = {
 139         .offset = 0x60,
 140 };
 141
 142 static const struct pbias_of_data pbias_of_data_dra7 = {
 143         .offset = 0xe00,
 144 };
 145
 146 static const struct of_device_id pbias_of_match[] = {
 147         { .compatible = "ti,pbias-omap", },
 148         { .compatible = "ti,pbias-omap2", .data = &pbias_of_data_omap2, },
 149         { .compatible = "ti,pbias-omap3", .data = &pbias_of_data_omap3, },
 150         { .compatible = "ti,pbias-omap4", .data = &pbias_of_data_omap4, },
 151         { .compatible = "ti,pbias-omap5", .data = &pbias_of_data_omap5, },
 152         { .compatible = "ti,pbias-dra7", .data = &pbias_of_data_dra7, },
 153         {},
 154 };
 155 MODULE_DEVICE_TABLE(of, pbias_of_match);
 156
 157 static int pbias_regulator_probe(struct platform_device *pdev)
 158 {
 159         struct device_node *np = pdev->dev.of_node;
 160         struct pbias_regulator_data *drvdata;
 161         struct resource *res;
 162         struct regulator_config cfg = { };
 163         struct regmap *syscon;
 164         const struct pbias_reg_info *info;
 165         int ret = 0;
 166         int count, idx, data_idx = 0;
 167         const struct of_device_id *match;
 168         const struct pbias_of_data *data;
 169         unsigned int offset;
 170
 171         count = of_regulator_match(&pdev->dev, np, pbias_matches,
 172                                                 PBIAS_NUM_REGS);
 173         if (count < 0)
 174                 return count;
 175
 176         drvdata = devm_kcalloc(&pdev->dev,
 177                                count, sizeof(struct pbias_regulator_data),
 178                                GFP_KERNEL);
 179         if (!drvdata)
 180                 return -ENOMEM;
 181
 182         syscon = syscon_regmap_lookup_by_phandle(np, "syscon");
 183         if (IS_ERR(syscon))
 184                 return PTR_ERR(syscon);
 185
 186         match = of_match_device(of_match_ptr(pbias_of_match), &pdev->dev);
 187         if (match && match->data) {
 188                 data = match->data;
 189                 offset = data->offset;
 190         } else {
 191                 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 192                 if (!res)
 193                         return -EINVAL;
 194
 195                 offset = res->start;
 196                 dev_WARN(&pdev->dev,
 197                          "using legacy dt data for pbias offset\n");
 198         }
 199
 200         cfg.regmap = syscon;
 201         cfg.dev = &pdev->dev;
 202
 203         for (idx = 0; idx < PBIAS_NUM_REGS && data_idx < count; idx++) {
 204                 if (!pbias_matches[idx].init_data ||
 205                         !pbias_matches[idx].of_node)
 206                         continue;
 207
 208                 info = pbias_matches[idx].driver_data;
 209                 if (!info)
 210                         return -ENODEV;
 211
 212                 drvdata[data_idx].syscon = syscon;
 213                 drvdata[data_idx].info = info;
 214                 drvdata[data_idx].desc.name = info->name;
 215                 drvdata[data_idx].desc.owner = THIS_MODULE;
 216                 drvdata[data_idx].desc.type = REGULATOR_VOLTAGE;
 217                 drvdata[data_idx].desc.ops = &pbias_regulator_voltage_ops;
 218                 drvdata[data_idx].desc.volt_table = info->pbias_volt_table;
 219                 drvdata[data_idx].desc.n_voltages = info->n_voltages;
 220                 drvdata[data_idx].desc.enable_time = info->enable_time;
 221                 drvdata[data_idx].desc.vsel_reg = offset;
 222                 drvdata[data_idx].desc.vsel_mask = info->vmode;
 223                 drvdata[data_idx].desc.enable_reg = offset;
 224                 drvdata[data_idx].desc.enable_mask = info->enable_mask;
 225                 drvdata[data_idx].desc.enable_val = info->enable;
 226                 drvdata[data_idx].desc.disable_val = info->disable_val;
 227
 228                 cfg.init_data = pbias_matches[idx].init_data;
 229                 cfg.driver_data = &drvdata[data_idx];
 230                 cfg.of_node = pbias_matches[idx].of_node;
 231
 232                 drvdata[data_idx].dev = devm_regulator_register(&pdev->dev,
 233                                         &drvdata[data_idx].desc, &cfg);
 234                 if (IS_ERR(drvdata[data_idx].dev)) {
 235                         ret = PTR_ERR(drvdata[data_idx].dev);
 236                         dev_err(&pdev->dev,
 237                                 "Failed to register regulator: %d\n", ret);
 238                         goto err_regulator;
 239                 }
 240                 data_idx++;
 241         }
 242
 243         platform_set_drvdata(pdev, drvdata);
 244
 245 err_regulator:
 246         return ret;
 247 }
 248
 249 static struct platform_driver pbias_regulator_driver = {
 250         .probe          = pbias_regulator_probe,
 251         .driver         = {
 252                 .name           = "pbias-regulator",
 253                 .of_match_table = of_match_ptr(pbias_of_match),
 254         },
 255 };
 256
 257 module_platform_driver(pbias_regulator_driver);
 258
 259 MODULE_AUTHOR("Balaji T K <balajitk@ti.com>");
 260 MODULE_DESCRIPTION("pbias voltage regulator");
 261 MODULE_LICENSE("GPL");
 262 MODULE_ALIAS("platform:pbias-regulator");