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 }; 38 39 struct pbias_regulator_data { 40 struct regulator_desc desc; 41 void __iomem *pbias_addr; 42 struct regulator_dev *dev; 43 struct regmap *syscon; 44 const struct pbias_reg_info *info; 45 int voltage; 46 }; 47 48 struct pbias_of_data { 49 unsigned int offset; 50 }; 51 52 static const unsigned int pbias_volt_table[] = { 53 1800000, 54 3000000 55 }; 56 57 static const struct regulator_ops pbias_regulator_voltage_ops = { 58 .list_voltage = regulator_list_voltage_table, 59 .get_voltage_sel = regulator_get_voltage_sel_regmap, 60 .set_voltage_sel = regulator_set_voltage_sel_regmap, 61 .enable = regulator_enable_regmap, 62 .disable = regulator_disable_regmap, 63 .is_enabled = regulator_is_enabled_regmap, 64 }; 65 66 static const struct pbias_reg_info pbias_mmc_omap2430 = { 67 .enable = BIT(1), 68 .enable_mask = BIT(1), 69 .vmode = BIT(0), 70 .disable_val = 0, 71 .enable_time = 100, 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 .name = "pbias_sim_omap3" 81 }; 82 83 static const struct pbias_reg_info pbias_mmc_omap4 = { 84 .enable = BIT(26) | BIT(22), 85 .enable_mask = BIT(26) | BIT(25) | BIT(22), 86 .disable_val = BIT(25), 87 .vmode = BIT(21), 88 .enable_time = 100, 89 .name = "pbias_mmc_omap4" 90 }; 91 92 static const struct pbias_reg_info pbias_mmc_omap5 = { 93 .enable = BIT(27) | BIT(26), 94 .enable_mask = BIT(27) | BIT(25) | BIT(26), 95 .disable_val = BIT(25), 96 .vmode = BIT(21), 97 .enable_time = 100, 98 .name = "pbias_mmc_omap5" 99 }; 100 101 static struct of_regulator_match pbias_matches[] = { 102 { .name = "pbias_mmc_omap2430", .driver_data = (void *)&pbias_mmc_omap2430}, 103 { .name = "pbias_sim_omap3", .driver_data = (void *)&pbias_sim_omap3}, 104 { .name = "pbias_mmc_omap4", .driver_data = (void *)&pbias_mmc_omap4}, 105 { .name = "pbias_mmc_omap5", .driver_data = (void *)&pbias_mmc_omap5}, 106 }; 107 #define PBIAS_NUM_REGS ARRAY_SIZE(pbias_matches) 108 109 /* Offset from SCM general area (and syscon) base */ 110 111 static const struct pbias_of_data pbias_of_data_omap2 = { 112 .offset = 0x230, 113 }; 114 115 static const struct pbias_of_data pbias_of_data_omap3 = { 116 .offset = 0x2b0, 117 }; 118 119 static const struct pbias_of_data pbias_of_data_omap4 = { 120 .offset = 0x60, 121 }; 122 123 static const struct pbias_of_data pbias_of_data_omap5 = { 124 .offset = 0x60, 125 }; 126 127 static const struct pbias_of_data pbias_of_data_dra7 = { 128 .offset = 0xe00, 129 }; 130 131 static const struct of_device_id pbias_of_match[] = { 132 { .compatible = "ti,pbias-omap", }, 133 { .compatible = "ti,pbias-omap2", .data = &pbias_of_data_omap2, }, 134 { .compatible = "ti,pbias-omap3", .data = &pbias_of_data_omap3, }, 135 { .compatible = "ti,pbias-omap4", .data = &pbias_of_data_omap4, }, 136 { .compatible = "ti,pbias-omap5", .data = &pbias_of_data_omap5, }, 137 { .compatible = "ti,pbias-dra7", .data = &pbias_of_data_dra7, }, 138 {}, 139 }; 140 MODULE_DEVICE_TABLE(of, pbias_of_match); 141 142 static int pbias_regulator_probe(struct platform_device *pdev) 143 { 144 struct device_node *np = pdev->dev.of_node; 145 struct pbias_regulator_data *drvdata; 146 struct resource *res; 147 struct regulator_config cfg = { }; 148 struct regmap *syscon; 149 const struct pbias_reg_info *info; 150 int ret = 0; 151 int count, idx, data_idx = 0; 152 const struct of_device_id *match; 153 const struct pbias_of_data *data; 154 unsigned int offset; 155 156 count = of_regulator_match(&pdev->dev, np, pbias_matches, 157 PBIAS_NUM_REGS); 158 if (count < 0) 159 return count; 160 161 drvdata = devm_kzalloc(&pdev->dev, sizeof(struct pbias_regulator_data) 162 * count, GFP_KERNEL); 163 if (!drvdata) 164 return -ENOMEM; 165 166 syscon = syscon_regmap_lookup_by_phandle(np, "syscon"); 167 if (IS_ERR(syscon)) 168 return PTR_ERR(syscon); 169 170 match = of_match_device(of_match_ptr(pbias_of_match), &pdev->dev); 171 if (match && match->data) { 172 data = match->data; 173 offset = data->offset; 174 } else { 175 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 176 if (!res) 177 return -EINVAL; 178 179 offset = res->start; 180 dev_WARN(&pdev->dev, 181 "using legacy dt data for pbias offset\n"); 182 } 183 184 cfg.regmap = syscon; 185 cfg.dev = &pdev->dev; 186 187 for (idx = 0; idx < PBIAS_NUM_REGS && data_idx < count; idx++) { 188 if (!pbias_matches[idx].init_data || 189 !pbias_matches[idx].of_node) 190 continue; 191 192 info = pbias_matches[idx].driver_data; 193 if (!info) 194 return -ENODEV; 195 196 drvdata[data_idx].syscon = syscon; 197 drvdata[data_idx].info = info; 198 drvdata[data_idx].desc.name = info->name; 199 drvdata[data_idx].desc.owner = THIS_MODULE; 200 drvdata[data_idx].desc.type = REGULATOR_VOLTAGE; 201 drvdata[data_idx].desc.ops = &pbias_regulator_voltage_ops; 202 drvdata[data_idx].desc.volt_table = pbias_volt_table; 203 drvdata[data_idx].desc.n_voltages = 2; 204 drvdata[data_idx].desc.enable_time = info->enable_time; 205 drvdata[data_idx].desc.vsel_reg = offset; 206 drvdata[data_idx].desc.vsel_mask = info->vmode; 207 drvdata[data_idx].desc.enable_reg = offset; 208 drvdata[data_idx].desc.enable_mask = info->enable_mask; 209 drvdata[data_idx].desc.enable_val = info->enable; 210 drvdata[data_idx].desc.disable_val = info->disable_val; 211 212 cfg.init_data = pbias_matches[idx].init_data; 213 cfg.driver_data = &drvdata[data_idx]; 214 cfg.of_node = pbias_matches[idx].of_node; 215 216 drvdata[data_idx].dev = devm_regulator_register(&pdev->dev, 217 &drvdata[data_idx].desc, &cfg); 218 if (IS_ERR(drvdata[data_idx].dev)) { 219 ret = PTR_ERR(drvdata[data_idx].dev); 220 dev_err(&pdev->dev, 221 "Failed to register regulator: %d\n", ret); 222 goto err_regulator; 223 } 224 data_idx++; 225 } 226 227 platform_set_drvdata(pdev, drvdata); 228 229 err_regulator: 230 return ret; 231 } 232 233 static struct platform_driver pbias_regulator_driver = { 234 .probe = pbias_regulator_probe, 235 .driver = { 236 .name = "pbias-regulator", 237 .of_match_table = of_match_ptr(pbias_of_match), 238 }, 239 }; 240 241 module_platform_driver(pbias_regulator_driver); 242 243 MODULE_AUTHOR("Balaji T K <balajitk@ti.com>"); 244 MODULE_DESCRIPTION("pbias voltage regulator"); 245 MODULE_LICENSE("GPL"); 246 MODULE_ALIAS("platform:pbias-regulator"); 247