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"); 263