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 #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_of_data { 42 unsigned int offset; 43 }; 44 45 static const unsigned int pbias_volt_table_3_0V[] = { 46 1800000, 47 3000000 48 }; 49 50 static const unsigned int pbias_volt_table_3_3V[] = { 51 1800000, 52 3300000 53 }; 54 55 static const struct regulator_ops pbias_regulator_voltage_ops = { 56 .list_voltage = regulator_list_voltage_table, 57 .get_voltage_sel = regulator_get_voltage_sel_regmap, 58 .set_voltage_sel = regulator_set_voltage_sel_regmap, 59 .enable = regulator_enable_regmap, 60 .disable = regulator_disable_regmap, 61 .is_enabled = regulator_is_enabled_regmap, 62 }; 63 64 static const struct pbias_reg_info pbias_mmc_omap2430 = { 65 .enable = BIT(1), 66 .enable_mask = BIT(1), 67 .vmode = BIT(0), 68 .disable_val = 0, 69 .enable_time = 100, 70 .pbias_volt_table = pbias_volt_table_3_0V, 71 .n_voltages = 2, 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 .pbias_volt_table = pbias_volt_table_3_0V, 81 .n_voltages = 2, 82 .name = "pbias_sim_omap3" 83 }; 84 85 static const struct pbias_reg_info pbias_mmc_omap4 = { 86 .enable = BIT(26) | BIT(22), 87 .enable_mask = BIT(26) | BIT(25) | BIT(22), 88 .disable_val = BIT(25), 89 .vmode = BIT(21), 90 .enable_time = 100, 91 .pbias_volt_table = pbias_volt_table_3_0V, 92 .n_voltages = 2, 93 .name = "pbias_mmc_omap4" 94 }; 95 96 static const struct pbias_reg_info pbias_mmc_omap5 = { 97 .enable = BIT(27) | BIT(26), 98 .enable_mask = BIT(27) | BIT(25) | BIT(26), 99 .disable_val = BIT(25), 100 .vmode = BIT(21), 101 .enable_time = 100, 102 .pbias_volt_table = pbias_volt_table_3_3V, 103 .n_voltages = 2, 104 .name = "pbias_mmc_omap5" 105 }; 106 107 static struct of_regulator_match pbias_matches[] = { 108 { .name = "pbias_mmc_omap2430", .driver_data = (void *)&pbias_mmc_omap2430}, 109 { .name = "pbias_sim_omap3", .driver_data = (void *)&pbias_sim_omap3}, 110 { .name = "pbias_mmc_omap4", .driver_data = (void *)&pbias_mmc_omap4}, 111 { .name = "pbias_mmc_omap5", .driver_data = (void *)&pbias_mmc_omap5}, 112 }; 113 #define PBIAS_NUM_REGS ARRAY_SIZE(pbias_matches) 114 115 /* Offset from SCM general area (and syscon) base */ 116 117 static const struct pbias_of_data pbias_of_data_omap2 = { 118 .offset = 0x230, 119 }; 120 121 static const struct pbias_of_data pbias_of_data_omap3 = { 122 .offset = 0x2b0, 123 }; 124 125 static const struct pbias_of_data pbias_of_data_omap4 = { 126 .offset = 0x60, 127 }; 128 129 static const struct pbias_of_data pbias_of_data_omap5 = { 130 .offset = 0x60, 131 }; 132 133 static const struct pbias_of_data pbias_of_data_dra7 = { 134 .offset = 0xe00, 135 }; 136 137 static const struct of_device_id pbias_of_match[] = { 138 { .compatible = "ti,pbias-omap", }, 139 { .compatible = "ti,pbias-omap2", .data = &pbias_of_data_omap2, }, 140 { .compatible = "ti,pbias-omap3", .data = &pbias_of_data_omap3, }, 141 { .compatible = "ti,pbias-omap4", .data = &pbias_of_data_omap4, }, 142 { .compatible = "ti,pbias-omap5", .data = &pbias_of_data_omap5, }, 143 { .compatible = "ti,pbias-dra7", .data = &pbias_of_data_dra7, }, 144 {}, 145 }; 146 MODULE_DEVICE_TABLE(of, pbias_of_match); 147 148 static int pbias_regulator_probe(struct platform_device *pdev) 149 { 150 struct device_node *np = pdev->dev.of_node; 151 struct resource *res; 152 struct regulator_config cfg = { }; 153 struct regulator_desc *desc; 154 struct regulator_dev *rdev; 155 struct regmap *syscon; 156 const struct pbias_reg_info *info; 157 int ret, count, idx; 158 const struct pbias_of_data *data; 159 unsigned int offset; 160 161 count = of_regulator_match(&pdev->dev, np, pbias_matches, 162 PBIAS_NUM_REGS); 163 if (count < 0) 164 return count; 165 166 desc = devm_kcalloc(&pdev->dev, count, sizeof(*desc), GFP_KERNEL); 167 if (!desc) 168 return -ENOMEM; 169 170 syscon = syscon_regmap_lookup_by_phandle(np, "syscon"); 171 if (IS_ERR(syscon)) 172 return PTR_ERR(syscon); 173 174 data = of_device_get_match_data(&pdev->dev); 175 if (data) { 176 offset = data->offset; 177 } else { 178 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 179 if (!res) 180 return -EINVAL; 181 182 offset = res->start; 183 dev_WARN(&pdev->dev, 184 "using legacy dt data for pbias offset\n"); 185 } 186 187 cfg.regmap = syscon; 188 cfg.dev = &pdev->dev; 189 190 for (idx = 0; idx < PBIAS_NUM_REGS && count; idx++) { 191 if (!pbias_matches[idx].init_data || 192 !pbias_matches[idx].of_node) 193 continue; 194 195 info = pbias_matches[idx].driver_data; 196 if (!info) 197 return -ENODEV; 198 199 desc->name = info->name; 200 desc->owner = THIS_MODULE; 201 desc->type = REGULATOR_VOLTAGE; 202 desc->ops = &pbias_regulator_voltage_ops; 203 desc->volt_table = info->pbias_volt_table; 204 desc->n_voltages = info->n_voltages; 205 desc->enable_time = info->enable_time; 206 desc->vsel_reg = offset; 207 desc->vsel_mask = info->vmode; 208 desc->enable_reg = offset; 209 desc->enable_mask = info->enable_mask; 210 desc->enable_val = info->enable; 211 desc->disable_val = info->disable_val; 212 213 cfg.init_data = pbias_matches[idx].init_data; 214 cfg.of_node = pbias_matches[idx].of_node; 215 216 rdev = devm_regulator_register(&pdev->dev, desc, &cfg); 217 if (IS_ERR(rdev)) { 218 ret = PTR_ERR(rdev); 219 dev_err(&pdev->dev, 220 "Failed to register regulator: %d\n", ret); 221 return ret; 222 } 223 desc++; 224 count--; 225 } 226 227 return 0; 228 } 229 230 static struct platform_driver pbias_regulator_driver = { 231 .probe = pbias_regulator_probe, 232 .driver = { 233 .name = "pbias-regulator", 234 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 235 .of_match_table = of_match_ptr(pbias_of_match), 236 }, 237 }; 238 239 module_platform_driver(pbias_regulator_driver); 240 241 MODULE_AUTHOR("Balaji T K <balajitk@ti.com>"); 242 MODULE_DESCRIPTION("pbias voltage regulator"); 243 MODULE_LICENSE("GPL"); 244 MODULE_ALIAS("platform:pbias-regulator"); 245