drivers/regulator/pbias-regulator.c

   1 /*
   2  * pbias-regulator.c
   3  *
   4  * Copyright (C) 2014 Texas Instruments Incorporated - https://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
  29 struct pbias_reg_info {
  30         u32 enable;
  31         u32 enable_mask;
  32         u32 disable_val;
  33         u32 vmode;
  34         unsigned int enable_time;
  35         char *name;
  36         const unsigned int *pbias_volt_table;
  37         int n_voltages;
  38 };
  39
  40 struct pbias_of_data {
  41         unsigned int offset;
  42 };
  43
  44 static const unsigned int pbias_volt_table_3_0V[] = {
  45         1800000,
  46         3000000
  47 };
  48
  49 static const unsigned int pbias_volt_table_3_3V[] = {
  50         1800000,
  51         3300000
  52 };
  53
  54 static const struct regulator_ops pbias_regulator_voltage_ops = {
  55         .list_voltage = regulator_list_voltage_table,
  56         .get_voltage_sel = regulator_get_voltage_sel_regmap,
  57         .set_voltage_sel = regulator_set_voltage_sel_regmap,
  58         .enable = regulator_enable_regmap,
  59         .disable = regulator_disable_regmap,
  60         .is_enabled = regulator_is_enabled_regmap,
  61 };
  62
  63 static const struct pbias_reg_info pbias_mmc_omap2430 = {
  64         .enable = BIT(1),
  65         .enable_mask = BIT(1),
  66         .vmode = BIT(0),
  67         .disable_val = 0,
  68         .enable_time = 100,
  69         .pbias_volt_table = pbias_volt_table_3_0V,
  70         .n_voltages = 2,
  71         .name = "pbias_mmc_omap2430"
  72 };
  73
  74 static const struct pbias_reg_info pbias_sim_omap3 = {
  75         .enable = BIT(9),
  76         .enable_mask = BIT(9),
  77         .vmode = BIT(8),
  78         .enable_time = 100,
  79         .pbias_volt_table = pbias_volt_table_3_0V,
  80         .n_voltages = 2,
  81         .name = "pbias_sim_omap3"
  82 };
  83
  84 static const struct pbias_reg_info pbias_mmc_omap4 = {
  85         .enable = BIT(26) | BIT(22),
  86         .enable_mask = BIT(26) | BIT(25) | BIT(22),
  87         .disable_val = BIT(25),
  88         .vmode = BIT(21),
  89         .enable_time = 100,
  90         .pbias_volt_table = pbias_volt_table_3_0V,
  91         .n_voltages = 2,
  92         .name = "pbias_mmc_omap4"
  93 };
  94
  95 static const struct pbias_reg_info pbias_mmc_omap5 = {
  96         .enable = BIT(27) | BIT(26),
  97         .enable_mask = BIT(27) | BIT(25) | BIT(26),
  98         .disable_val = BIT(25),
  99         .vmode = BIT(21),
 100         .enable_time = 100,
 101         .pbias_volt_table = pbias_volt_table_3_3V,
 102         .n_voltages = 2,
 103         .name = "pbias_mmc_omap5"
 104 };
 105
 106 static struct of_regulator_match pbias_matches[] = {
 107         { .name = "pbias_mmc_omap2430", .driver_data = (void *)&pbias_mmc_omap2430},
 108         { .name = "pbias_sim_omap3", .driver_data = (void *)&pbias_sim_omap3},
 109         { .name = "pbias_mmc_omap4", .driver_data = (void *)&pbias_mmc_omap4},
 110         { .name = "pbias_mmc_omap5", .driver_data = (void *)&pbias_mmc_omap5},
 111 };
 112 #define PBIAS_NUM_REGS  ARRAY_SIZE(pbias_matches)
 113
 114 /* Offset from SCM general area (and syscon) base */
 115
 116 static const struct pbias_of_data pbias_of_data_omap2 = {
 117         .offset = 0x230,
 118 };
 119
 120 static const struct pbias_of_data pbias_of_data_omap3 = {
 121         .offset = 0x2b0,
 122 };
 123
 124 static const struct pbias_of_data pbias_of_data_omap4 = {
 125         .offset = 0x60,
 126 };
 127
 128 static const struct pbias_of_data pbias_of_data_omap5 = {
 129         .offset = 0x60,
 130 };
 131
 132 static const struct pbias_of_data pbias_of_data_dra7 = {
 133         .offset = 0xe00,
 134 };
 135
 136 static const struct of_device_id pbias_of_match[] = {
 137         { .compatible = "ti,pbias-omap", },
 138         { .compatible = "ti,pbias-omap2", .data = &pbias_of_data_omap2, },
 139         { .compatible = "ti,pbias-omap3", .data = &pbias_of_data_omap3, },
 140         { .compatible = "ti,pbias-omap4", .data = &pbias_of_data_omap4, },
 141         { .compatible = "ti,pbias-omap5", .data = &pbias_of_data_omap5, },
 142         { .compatible = "ti,pbias-dra7", .data = &pbias_of_data_dra7, },
 143         {},
 144 };
 145 MODULE_DEVICE_TABLE(of, pbias_of_match);
 146
 147 static int pbias_regulator_probe(struct platform_device *pdev)
 148 {
 149         struct device_node *np = pdev->dev.of_node;
 150         struct resource *res;
 151         struct regulator_config cfg = { };
 152         struct regulator_desc *desc;
 153         struct regulator_dev *rdev;
 154         struct regmap *syscon;
 155         const struct pbias_reg_info *info;
 156         int ret, count, idx;
 157         const struct pbias_of_data *data;
 158         unsigned int offset;
 159
 160         count = of_regulator_match(&pdev->dev, np, pbias_matches,
 161                                                 PBIAS_NUM_REGS);
 162         if (count < 0)
 163                 return count;
 164
 165         desc = devm_kcalloc(&pdev->dev, count, sizeof(*desc), GFP_KERNEL);
 166         if (!desc)
 167                 return -ENOMEM;
 168
 169         syscon = syscon_regmap_lookup_by_phandle(np, "syscon");
 170         if (IS_ERR(syscon))
 171                 return PTR_ERR(syscon);
 172
 173         data = of_device_get_match_data(&pdev->dev);
 174         if (data) {
 175                 offset = data->offset;
 176         } else {
 177                 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 178                 if (!res)
 179                         return -EINVAL;
 180
 181                 offset = res->start;
 182                 dev_WARN(&pdev->dev,
 183                          "using legacy dt data for pbias offset\n");
 184         }
 185
 186         cfg.regmap = syscon;
 187         cfg.dev = &pdev->dev;
 188
 189         for (idx = 0; idx < PBIAS_NUM_REGS && count; idx++) {
 190                 if (!pbias_matches[idx].init_data ||
 191                         !pbias_matches[idx].of_node)
 192                         continue;
 193
 194                 info = pbias_matches[idx].driver_data;
 195                 if (!info)
 196                         return -ENODEV;
 197
 198                 desc->name = info->name;
 199                 desc->owner = THIS_MODULE;
 200                 desc->type = REGULATOR_VOLTAGE;
 201                 desc->ops = &pbias_regulator_voltage_ops;
 202                 desc->volt_table = info->pbias_volt_table;
 203                 desc->n_voltages = info->n_voltages;
 204                 desc->enable_time = info->enable_time;
 205                 desc->vsel_reg = offset;
 206                 desc->vsel_mask = info->vmode;
 207                 desc->enable_reg = offset;
 208                 desc->enable_mask = info->enable_mask;
 209                 desc->enable_val = info->enable;
 210                 desc->disable_val = info->disable_val;
 211
 212                 cfg.init_data = pbias_matches[idx].init_data;
 213                 cfg.of_node = pbias_matches[idx].of_node;
 214
 215                 rdev = devm_regulator_register(&pdev->dev, desc, &cfg);
 216                 if (IS_ERR(rdev)) {
 217                         ret = PTR_ERR(rdev);
 218                         dev_err(&pdev->dev,
 219                                 "Failed to register regulator: %d\n", ret);
 220                         return ret;
 221                 }
 222                 desc++;
 223                 count--;
 224         }
 225
 226         return 0;
 227 }
 228
 229 static struct platform_driver pbias_regulator_driver = {
 230         .probe          = pbias_regulator_probe,
 231         .driver         = {
 232                 .name           = "pbias-regulator",
 233                 .probe_type     = PROBE_PREFER_ASYNCHRONOUS,
 234                 .of_match_table = of_match_ptr(pbias_of_match),
 235         },
 236 };
 237
 238 module_platform_driver(pbias_regulator_driver);
 239
 240 MODULE_AUTHOR("Balaji T K <balajitk@ti.com>");
 241 MODULE_DESCRIPTION("pbias voltage regulator");
 242 MODULE_LICENSE("GPL");
 243 MODULE_ALIAS("platform:pbias-regulator");