1 /* 2 * AS3711 PMIC regulator driver, using DCDC Step Down and LDO supplies 3 * 4 * Copyright (C) 2012 Renesas Electronics Corporation 5 * Author: Guennadi Liakhovetski, <g.liakhovetski@gmx.de> 6 * 7 * This program is free software; you can redistribute it and/or modify 8 * it under the terms of the version 2 of the GNU General Public License as 9 * published by the Free Software Foundation 10 */ 11 12 #include <linux/err.h> 13 #include <linux/init.h> 14 #include <linux/mfd/as3711.h> 15 #include <linux/module.h> 16 #include <linux/of.h> 17 #include <linux/platform_device.h> 18 #include <linux/regmap.h> 19 #include <linux/regulator/driver.h> 20 #include <linux/regulator/of_regulator.h> 21 #include <linux/slab.h> 22 23 struct as3711_regulator_info { 24 struct regulator_desc desc; 25 unsigned int max_uV; 26 }; 27 28 struct as3711_regulator { 29 struct as3711_regulator_info *reg_info; 30 struct regulator_dev *rdev; 31 }; 32 33 /* 34 * The regulator API supports 4 modes of operataion: FAST, NORMAL, IDLE and 35 * STANDBY. We map them in the following way to AS3711 SD1-4 DCDC modes: 36 * FAST: sdX_fast=1 37 * NORMAL: low_noise=1 38 * IDLE: low_noise=0 39 */ 40 41 static int as3711_set_mode_sd(struct regulator_dev *rdev, unsigned int mode) 42 { 43 unsigned int fast_bit = rdev->desc->enable_mask, 44 low_noise_bit = fast_bit << 4; 45 u8 val; 46 47 switch (mode) { 48 case REGULATOR_MODE_FAST: 49 val = fast_bit | low_noise_bit; 50 break; 51 case REGULATOR_MODE_NORMAL: 52 val = low_noise_bit; 53 break; 54 case REGULATOR_MODE_IDLE: 55 val = 0; 56 break; 57 default: 58 return -EINVAL; 59 } 60 61 return regmap_update_bits(rdev->regmap, AS3711_SD_CONTROL_1, 62 low_noise_bit | fast_bit, val); 63 } 64 65 static unsigned int as3711_get_mode_sd(struct regulator_dev *rdev) 66 { 67 unsigned int fast_bit = rdev->desc->enable_mask, 68 low_noise_bit = fast_bit << 4, mask = fast_bit | low_noise_bit; 69 unsigned int val; 70 int ret = regmap_read(rdev->regmap, AS3711_SD_CONTROL_1, &val); 71 72 if (ret < 0) 73 return ret; 74 75 if ((val & mask) == mask) 76 return REGULATOR_MODE_FAST; 77 78 if ((val & mask) == low_noise_bit) 79 return REGULATOR_MODE_NORMAL; 80 81 if (!(val & mask)) 82 return REGULATOR_MODE_IDLE; 83 84 return -EINVAL; 85 } 86 87 static struct regulator_ops as3711_sd_ops = { 88 .is_enabled = regulator_is_enabled_regmap, 89 .enable = regulator_enable_regmap, 90 .disable = regulator_disable_regmap, 91 .get_voltage_sel = regulator_get_voltage_sel_regmap, 92 .set_voltage_sel = regulator_set_voltage_sel_regmap, 93 .list_voltage = regulator_list_voltage_linear_range, 94 .map_voltage = regulator_map_voltage_linear_range, 95 .get_mode = as3711_get_mode_sd, 96 .set_mode = as3711_set_mode_sd, 97 }; 98 99 static struct regulator_ops as3711_aldo_ops = { 100 .is_enabled = regulator_is_enabled_regmap, 101 .enable = regulator_enable_regmap, 102 .disable = regulator_disable_regmap, 103 .get_voltage_sel = regulator_get_voltage_sel_regmap, 104 .set_voltage_sel = regulator_set_voltage_sel_regmap, 105 .list_voltage = regulator_list_voltage_linear_range, 106 .map_voltage = regulator_map_voltage_linear_range, 107 }; 108 109 static struct regulator_ops as3711_dldo_ops = { 110 .is_enabled = regulator_is_enabled_regmap, 111 .enable = regulator_enable_regmap, 112 .disable = regulator_disable_regmap, 113 .get_voltage_sel = regulator_get_voltage_sel_regmap, 114 .set_voltage_sel = regulator_set_voltage_sel_regmap, 115 .list_voltage = regulator_list_voltage_linear_range, 116 .map_voltage = regulator_map_voltage_linear_range, 117 }; 118 119 static const struct regulator_linear_range as3711_sd_ranges[] = { 120 REGULATOR_LINEAR_RANGE(612500, 0x1, 0x40, 12500), 121 REGULATOR_LINEAR_RANGE(1425000, 0x41, 0x70, 25000), 122 REGULATOR_LINEAR_RANGE(2650000, 0x71, 0x7f, 50000), 123 }; 124 125 static const struct regulator_linear_range as3711_aldo_ranges[] = { 126 REGULATOR_LINEAR_RANGE(1200000, 0, 0xf, 50000), 127 REGULATOR_LINEAR_RANGE(1800000, 0x10, 0x1f, 100000), 128 }; 129 130 static const struct regulator_linear_range as3711_dldo_ranges[] = { 131 REGULATOR_LINEAR_RANGE(900000, 0, 0x10, 50000), 132 REGULATOR_LINEAR_RANGE(1750000, 0x20, 0x3f, 50000), 133 }; 134 135 #define AS3711_REG(_id, _en_reg, _en_bit, _vmask, _vshift, _min_uV, _max_uV, _sfx) \ 136 [AS3711_REGULATOR_ ## _id] = { \ 137 .desc = { \ 138 .name = "as3711-regulator-" # _id, \ 139 .id = AS3711_REGULATOR_ ## _id, \ 140 .n_voltages = (_vmask + 1), \ 141 .ops = &as3711_ ## _sfx ## _ops, \ 142 .type = REGULATOR_VOLTAGE, \ 143 .owner = THIS_MODULE, \ 144 .vsel_reg = AS3711_ ## _id ## _VOLTAGE, \ 145 .vsel_mask = _vmask << _vshift, \ 146 .enable_reg = AS3711_ ## _en_reg, \ 147 .enable_mask = BIT(_en_bit), \ 148 .min_uV = _min_uV, \ 149 .linear_ranges = as3711_ ## _sfx ## _ranges, \ 150 .n_linear_ranges = ARRAY_SIZE(as3711_ ## _sfx ## _ranges), \ 151 }, \ 152 .max_uV = _max_uV, \ 153 } 154 155 static struct as3711_regulator_info as3711_reg_info[] = { 156 AS3711_REG(SD_1, SD_CONTROL, 0, 0x7f, 0, 612500, 3350000, sd), 157 AS3711_REG(SD_2, SD_CONTROL, 1, 0x7f, 0, 612500, 3350000, sd), 158 AS3711_REG(SD_3, SD_CONTROL, 2, 0x7f, 0, 612500, 3350000, sd), 159 AS3711_REG(SD_4, SD_CONTROL, 3, 0x7f, 0, 612500, 3350000, sd), 160 AS3711_REG(LDO_1, LDO_1_VOLTAGE, 7, 0x1f, 0, 1200000, 3300000, aldo), 161 AS3711_REG(LDO_2, LDO_2_VOLTAGE, 7, 0x1f, 0, 1200000, 3300000, aldo), 162 AS3711_REG(LDO_3, LDO_3_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo), 163 AS3711_REG(LDO_4, LDO_4_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo), 164 AS3711_REG(LDO_5, LDO_5_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo), 165 AS3711_REG(LDO_6, LDO_6_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo), 166 AS3711_REG(LDO_7, LDO_7_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo), 167 AS3711_REG(LDO_8, LDO_8_VOLTAGE, 7, 0x3f, 0, 900000, 3300000, dldo), 168 /* StepUp output voltage depends on supplying regulator */ 169 }; 170 171 #define AS3711_REGULATOR_NUM ARRAY_SIZE(as3711_reg_info) 172 173 static struct of_regulator_match 174 as3711_regulator_matches[AS3711_REGULATOR_NUM] = { 175 [AS3711_REGULATOR_SD_1] = { .name = "sd1" }, 176 [AS3711_REGULATOR_SD_2] = { .name = "sd2" }, 177 [AS3711_REGULATOR_SD_3] = { .name = "sd3" }, 178 [AS3711_REGULATOR_SD_4] = { .name = "sd4" }, 179 [AS3711_REGULATOR_LDO_1] = { .name = "ldo1" }, 180 [AS3711_REGULATOR_LDO_2] = { .name = "ldo2" }, 181 [AS3711_REGULATOR_LDO_3] = { .name = "ldo3" }, 182 [AS3711_REGULATOR_LDO_4] = { .name = "ldo4" }, 183 [AS3711_REGULATOR_LDO_5] = { .name = "ldo5" }, 184 [AS3711_REGULATOR_LDO_6] = { .name = "ldo6" }, 185 [AS3711_REGULATOR_LDO_7] = { .name = "ldo7" }, 186 [AS3711_REGULATOR_LDO_8] = { .name = "ldo8" }, 187 }; 188 189 static int as3711_regulator_parse_dt(struct device *dev, 190 struct device_node **of_node, const int count) 191 { 192 struct as3711_regulator_pdata *pdata = dev_get_platdata(dev); 193 struct device_node *regulators = 194 of_find_node_by_name(dev->parent->of_node, "regulators"); 195 struct of_regulator_match *match; 196 int ret, i; 197 198 if (!regulators) { 199 dev_err(dev, "regulator node not found\n"); 200 return -ENODEV; 201 } 202 203 ret = of_regulator_match(dev->parent, regulators, 204 as3711_regulator_matches, count); 205 of_node_put(regulators); 206 if (ret < 0) { 207 dev_err(dev, "Error parsing regulator init data: %d\n", ret); 208 return ret; 209 } 210 211 for (i = 0, match = as3711_regulator_matches; i < count; i++, match++) 212 if (match->of_node) { 213 pdata->init_data[i] = match->init_data; 214 of_node[i] = match->of_node; 215 } 216 217 return 0; 218 } 219 220 static int as3711_regulator_probe(struct platform_device *pdev) 221 { 222 struct as3711_regulator_pdata *pdata = dev_get_platdata(&pdev->dev); 223 struct as3711 *as3711 = dev_get_drvdata(pdev->dev.parent); 224 struct regulator_init_data *reg_data; 225 struct regulator_config config = {.dev = &pdev->dev,}; 226 struct as3711_regulator *reg = NULL; 227 struct as3711_regulator *regs; 228 struct device_node *of_node[AS3711_REGULATOR_NUM] = {}; 229 struct regulator_dev *rdev; 230 struct as3711_regulator_info *ri; 231 int ret; 232 int id; 233 234 if (!pdata) { 235 dev_err(&pdev->dev, "No platform data...\n"); 236 return -ENODEV; 237 } 238 239 if (pdev->dev.parent->of_node) { 240 ret = as3711_regulator_parse_dt(&pdev->dev, of_node, AS3711_REGULATOR_NUM); 241 if (ret < 0) { 242 dev_err(&pdev->dev, "DT parsing failed: %d\n", ret); 243 return ret; 244 } 245 } 246 247 regs = devm_kzalloc(&pdev->dev, AS3711_REGULATOR_NUM * 248 sizeof(struct as3711_regulator), GFP_KERNEL); 249 if (!regs) { 250 dev_err(&pdev->dev, "Memory allocation failed exiting..\n"); 251 return -ENOMEM; 252 } 253 254 for (id = 0, ri = as3711_reg_info; id < AS3711_REGULATOR_NUM; ++id, ri++) { 255 reg_data = pdata->init_data[id]; 256 257 /* No need to register if there is no regulator data */ 258 if (!reg_data) 259 continue; 260 261 reg = ®s[id]; 262 reg->reg_info = ri; 263 264 config.init_data = reg_data; 265 config.driver_data = reg; 266 config.regmap = as3711->regmap; 267 config.of_node = of_node[id]; 268 269 rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config); 270 if (IS_ERR(rdev)) { 271 dev_err(&pdev->dev, "Failed to register regulator %s\n", 272 ri->desc.name); 273 return PTR_ERR(rdev); 274 } 275 reg->rdev = rdev; 276 } 277 platform_set_drvdata(pdev, regs); 278 return 0; 279 } 280 281 static struct platform_driver as3711_regulator_driver = { 282 .driver = { 283 .name = "as3711-regulator", 284 .owner = THIS_MODULE, 285 }, 286 .probe = as3711_regulator_probe, 287 }; 288 289 static int __init as3711_regulator_init(void) 290 { 291 return platform_driver_register(&as3711_regulator_driver); 292 } 293 subsys_initcall(as3711_regulator_init); 294 295 static void __exit as3711_regulator_exit(void) 296 { 297 platform_driver_unregister(&as3711_regulator_driver); 298 } 299 module_exit(as3711_regulator_exit); 300 301 MODULE_AUTHOR("Guennadi Liakhovetski <g.liakhovetski@gmx.de>"); 302 MODULE_DESCRIPTION("AS3711 regulator driver"); 303 MODULE_ALIAS("platform:as3711-regulator"); 304 MODULE_LICENSE("GPL v2"); 305