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"); 244