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 vmode; 34 unsigned int enable_time; 35 char *name; 36 }; 37 38 struct pbias_regulator_data { 39 struct regulator_desc desc; 40 void __iomem *pbias_addr; 41 struct regulator_dev *dev; 42 struct regmap *syscon; 43 const struct pbias_reg_info *info; 44 int voltage; 45 }; 46 47 static const unsigned int pbias_volt_table[] = { 48 1800000, 49 3000000 50 }; 51 52 static struct regulator_ops pbias_regulator_voltage_ops = { 53 .list_voltage = regulator_list_voltage_table, 54 .get_voltage_sel = regulator_get_voltage_sel_regmap, 55 .set_voltage_sel = regulator_set_voltage_sel_regmap, 56 .enable = regulator_enable_regmap, 57 .disable = regulator_disable_regmap, 58 .is_enabled = regulator_is_enabled_regmap, 59 }; 60 61 static const struct pbias_reg_info pbias_mmc_omap2430 = { 62 .enable = BIT(1), 63 .enable_mask = BIT(1), 64 .vmode = BIT(0), 65 .enable_time = 100, 66 .name = "pbias_mmc_omap2430" 67 }; 68 69 static const struct pbias_reg_info pbias_sim_omap3 = { 70 .enable = BIT(9), 71 .enable_mask = BIT(9), 72 .vmode = BIT(8), 73 .enable_time = 100, 74 .name = "pbias_sim_omap3" 75 }; 76 77 static const struct pbias_reg_info pbias_mmc_omap4 = { 78 .enable = BIT(26) | BIT(22), 79 .enable_mask = BIT(26) | BIT(25) | BIT(22), 80 .vmode = BIT(21), 81 .enable_time = 100, 82 .name = "pbias_mmc_omap4" 83 }; 84 85 static const struct pbias_reg_info pbias_mmc_omap5 = { 86 .enable = BIT(27) | BIT(26), 87 .enable_mask = BIT(27) | BIT(25) | BIT(26), 88 .vmode = BIT(21), 89 .enable_time = 100, 90 .name = "pbias_mmc_omap5" 91 }; 92 93 static struct of_regulator_match pbias_matches[] = { 94 { .name = "pbias_mmc_omap2430", .driver_data = (void *)&pbias_mmc_omap2430}, 95 { .name = "pbias_sim_omap3", .driver_data = (void *)&pbias_sim_omap3}, 96 { .name = "pbias_mmc_omap4", .driver_data = (void *)&pbias_mmc_omap4}, 97 { .name = "pbias_mmc_omap5", .driver_data = (void *)&pbias_mmc_omap5}, 98 }; 99 #define PBIAS_NUM_REGS ARRAY_SIZE(pbias_matches) 100 101 static const struct of_device_id pbias_of_match[] = { 102 { .compatible = "ti,pbias-omap", }, 103 {}, 104 }; 105 MODULE_DEVICE_TABLE(of, pbias_of_match); 106 107 static int pbias_regulator_probe(struct platform_device *pdev) 108 { 109 struct device_node *np = pdev->dev.of_node; 110 struct pbias_regulator_data *drvdata; 111 struct resource *res; 112 struct regulator_config cfg = { }; 113 struct regmap *syscon; 114 const struct pbias_reg_info *info; 115 int ret = 0; 116 int count, idx, data_idx = 0; 117 118 count = of_regulator_match(&pdev->dev, np, pbias_matches, 119 PBIAS_NUM_REGS); 120 if (count < 0) 121 return count; 122 123 drvdata = devm_kzalloc(&pdev->dev, sizeof(struct pbias_regulator_data) 124 * count, GFP_KERNEL); 125 if (!drvdata) 126 return -ENOMEM; 127 128 syscon = syscon_regmap_lookup_by_phandle(np, "syscon"); 129 if (IS_ERR(syscon)) 130 return PTR_ERR(syscon); 131 132 cfg.regmap = syscon; 133 cfg.dev = &pdev->dev; 134 135 for (idx = 0; idx < PBIAS_NUM_REGS && data_idx < count; idx++) { 136 if (!pbias_matches[idx].init_data || 137 !pbias_matches[idx].of_node) 138 continue; 139 140 info = pbias_matches[idx].driver_data; 141 if (!info) 142 return -ENODEV; 143 144 res = platform_get_resource(pdev, IORESOURCE_MEM, 0); 145 if (!res) 146 return -EINVAL; 147 148 drvdata[data_idx].syscon = syscon; 149 drvdata[data_idx].info = info; 150 drvdata[data_idx].desc.name = info->name; 151 drvdata[data_idx].desc.owner = THIS_MODULE; 152 drvdata[data_idx].desc.type = REGULATOR_VOLTAGE; 153 drvdata[data_idx].desc.ops = &pbias_regulator_voltage_ops; 154 drvdata[data_idx].desc.volt_table = pbias_volt_table; 155 drvdata[data_idx].desc.n_voltages = 2; 156 drvdata[data_idx].desc.enable_time = info->enable_time; 157 drvdata[data_idx].desc.vsel_reg = res->start; 158 drvdata[data_idx].desc.vsel_mask = info->vmode; 159 drvdata[data_idx].desc.enable_reg = res->start; 160 drvdata[data_idx].desc.enable_mask = info->enable_mask; 161 drvdata[data_idx].desc.enable_val = info->enable; 162 163 cfg.init_data = pbias_matches[idx].init_data; 164 cfg.driver_data = &drvdata[data_idx]; 165 cfg.of_node = pbias_matches[idx].of_node; 166 167 drvdata[data_idx].dev = devm_regulator_register(&pdev->dev, 168 &drvdata[data_idx].desc, &cfg); 169 if (IS_ERR(drvdata[data_idx].dev)) { 170 ret = PTR_ERR(drvdata[data_idx].dev); 171 dev_err(&pdev->dev, 172 "Failed to register regulator: %d\n", ret); 173 goto err_regulator; 174 } 175 data_idx++; 176 } 177 178 platform_set_drvdata(pdev, drvdata); 179 180 err_regulator: 181 return ret; 182 } 183 184 static struct platform_driver pbias_regulator_driver = { 185 .probe = pbias_regulator_probe, 186 .driver = { 187 .name = "pbias-regulator", 188 .of_match_table = of_match_ptr(pbias_of_match), 189 }, 190 }; 191 192 module_platform_driver(pbias_regulator_driver); 193 194 MODULE_AUTHOR("Balaji T K <balajitk@ti.com>"); 195 MODULE_DESCRIPTION("pbias voltage regulator"); 196 MODULE_LICENSE("GPL"); 197 MODULE_ALIAS("platform:pbias-regulator"); 198