1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * ROHM BD9571MWV-M and BD9574MWF-M regulator driver 4 * 5 * Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com> 6 * 7 * Based on the TPS65086 driver 8 * 9 * NOTE: VD09 is missing 10 */ 11 12 #include <linux/mfd/rohm-generic.h> 13 #include <linux/module.h> 14 #include <linux/of.h> 15 #include <linux/platform_device.h> 16 #include <linux/regulator/driver.h> 17 18 #include <linux/mfd/bd9571mwv.h> 19 20 struct bd9571mwv_reg { 21 struct regmap *regmap; 22 23 /* DDR Backup Power */ 24 u8 bkup_mode_cnt_keepon; /* from "rohm,ddr-backup-power" */ 25 u8 bkup_mode_cnt_saved; 26 bool bkup_mode_enabled; 27 28 /* Power switch type */ 29 bool rstbmode_level; 30 bool rstbmode_pulse; 31 }; 32 33 enum bd9571mwv_regulators { VD09, VD18, VD25, VD33, DVFS }; 34 35 #define BD9571MWV_REG(_name, _of, _id, _ops, _vr, _vm, _nv, _min, _step, _lmin)\ 36 { \ 37 .name = _name, \ 38 .of_match = of_match_ptr(_of), \ 39 .regulators_node = "regulators", \ 40 .id = _id, \ 41 .ops = &_ops, \ 42 .n_voltages = _nv, \ 43 .type = REGULATOR_VOLTAGE, \ 44 .owner = THIS_MODULE, \ 45 .vsel_reg = _vr, \ 46 .vsel_mask = _vm, \ 47 .min_uV = _min, \ 48 .uV_step = _step, \ 49 .linear_min_sel = _lmin, \ 50 } 51 52 static int bd9571mwv_avs_get_moni_state(struct regulator_dev *rdev) 53 { 54 unsigned int val; 55 int ret; 56 57 ret = regmap_read(rdev->regmap, BD9571MWV_AVS_SET_MONI, &val); 58 if (ret != 0) 59 return ret; 60 61 return val & BD9571MWV_AVS_SET_MONI_MASK; 62 } 63 64 static int bd9571mwv_avs_set_voltage_sel_regmap(struct regulator_dev *rdev, 65 unsigned int sel) 66 { 67 int ret; 68 69 ret = bd9571mwv_avs_get_moni_state(rdev); 70 if (ret < 0) 71 return ret; 72 73 return regmap_write_bits(rdev->regmap, BD9571MWV_AVS_VD09_VID(ret), 74 rdev->desc->vsel_mask, sel); 75 } 76 77 static int bd9571mwv_avs_get_voltage_sel_regmap(struct regulator_dev *rdev) 78 { 79 unsigned int val; 80 int ret; 81 82 ret = bd9571mwv_avs_get_moni_state(rdev); 83 if (ret < 0) 84 return ret; 85 86 ret = regmap_read(rdev->regmap, BD9571MWV_AVS_VD09_VID(ret), &val); 87 if (ret != 0) 88 return ret; 89 90 val &= rdev->desc->vsel_mask; 91 val >>= ffs(rdev->desc->vsel_mask) - 1; 92 93 return val; 94 } 95 96 static int bd9571mwv_reg_set_voltage_sel_regmap(struct regulator_dev *rdev, 97 unsigned int sel) 98 { 99 return regmap_write_bits(rdev->regmap, BD9571MWV_DVFS_SETVID, 100 rdev->desc->vsel_mask, sel); 101 } 102 103 /* Operations permitted on AVS voltage regulator */ 104 static const struct regulator_ops avs_ops = { 105 .set_voltage_sel = bd9571mwv_avs_set_voltage_sel_regmap, 106 .map_voltage = regulator_map_voltage_linear, 107 .get_voltage_sel = bd9571mwv_avs_get_voltage_sel_regmap, 108 .list_voltage = regulator_list_voltage_linear, 109 }; 110 111 /* Operations permitted on voltage regulators */ 112 static const struct regulator_ops reg_ops = { 113 .set_voltage_sel = bd9571mwv_reg_set_voltage_sel_regmap, 114 .map_voltage = regulator_map_voltage_linear, 115 .get_voltage_sel = regulator_get_voltage_sel_regmap, 116 .list_voltage = regulator_list_voltage_linear, 117 }; 118 119 /* Operations permitted on voltage monitors */ 120 static const struct regulator_ops vid_ops = { 121 .map_voltage = regulator_map_voltage_linear, 122 .get_voltage_sel = regulator_get_voltage_sel_regmap, 123 .list_voltage = regulator_list_voltage_linear, 124 }; 125 126 static const struct regulator_desc regulators[] = { 127 BD9571MWV_REG("VD09", "vd09", VD09, avs_ops, 0, 0x7f, 128 0x6f, 600000, 10000, 0x3c), 129 BD9571MWV_REG("VD18", "vd18", VD18, vid_ops, BD9571MWV_VD18_VID, 0xf, 130 16, 1625000, 25000, 0), 131 BD9571MWV_REG("VD25", "vd25", VD25, vid_ops, BD9571MWV_VD25_VID, 0xf, 132 16, 2150000, 50000, 0), 133 BD9571MWV_REG("VD33", "vd33", VD33, vid_ops, BD9571MWV_VD33_VID, 0xf, 134 11, 2800000, 100000, 0), 135 BD9571MWV_REG("DVFS", "dvfs", DVFS, reg_ops, 136 BD9571MWV_DVFS_MONIVDAC, 0x7f, 137 0x6f, 600000, 10000, 0x3c), 138 }; 139 140 #ifdef CONFIG_PM_SLEEP 141 static int bd9571mwv_bkup_mode_read(struct bd9571mwv_reg *bdreg, 142 unsigned int *mode) 143 { 144 int ret; 145 146 ret = regmap_read(bdreg->regmap, BD9571MWV_BKUP_MODE_CNT, mode); 147 if (ret) { 148 dev_err(regmap_get_device(bdreg->regmap), 149 "failed to read backup mode (%d)\n", ret); 150 return ret; 151 } 152 153 return 0; 154 } 155 156 static int bd9571mwv_bkup_mode_write(struct bd9571mwv_reg *bdreg, 157 unsigned int mode) 158 { 159 int ret; 160 161 ret = regmap_write(bdreg->regmap, BD9571MWV_BKUP_MODE_CNT, mode); 162 if (ret) { 163 dev_err(regmap_get_device(bdreg->regmap), 164 "failed to configure backup mode 0x%x (%d)\n", 165 mode, ret); 166 return ret; 167 } 168 169 return 0; 170 } 171 172 static ssize_t backup_mode_show(struct device *dev, 173 struct device_attribute *attr, char *buf) 174 { 175 struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev); 176 177 return sysfs_emit(buf, "%s\n", bdreg->bkup_mode_enabled ? "on" : "off"); 178 } 179 180 static ssize_t backup_mode_store(struct device *dev, 181 struct device_attribute *attr, 182 const char *buf, size_t count) 183 { 184 struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev); 185 unsigned int mode; 186 int ret; 187 188 if (!count) 189 return 0; 190 191 ret = kstrtobool(buf, &bdreg->bkup_mode_enabled); 192 if (ret) 193 return ret; 194 195 if (!bdreg->rstbmode_level) 196 return count; 197 198 /* 199 * Configure DDR Backup Mode, to change the role of the accessory power 200 * switch from a power switch to a wake-up switch, or vice versa 201 */ 202 ret = bd9571mwv_bkup_mode_read(bdreg, &mode); 203 if (ret) 204 return ret; 205 206 mode &= ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK; 207 if (bdreg->bkup_mode_enabled) 208 mode |= bdreg->bkup_mode_cnt_keepon; 209 210 ret = bd9571mwv_bkup_mode_write(bdreg, mode); 211 if (ret) 212 return ret; 213 214 return count; 215 } 216 217 static DEVICE_ATTR_RW(backup_mode); 218 219 static int bd9571mwv_suspend(struct device *dev) 220 { 221 struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev); 222 unsigned int mode; 223 int ret; 224 225 if (!bdreg->bkup_mode_enabled) 226 return 0; 227 228 /* Save DDR Backup Mode */ 229 ret = bd9571mwv_bkup_mode_read(bdreg, &mode); 230 if (ret) 231 return ret; 232 233 bdreg->bkup_mode_cnt_saved = mode; 234 235 if (!bdreg->rstbmode_pulse) 236 return 0; 237 238 /* Enable DDR Backup Mode */ 239 mode &= ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK; 240 mode |= bdreg->bkup_mode_cnt_keepon; 241 242 if (mode != bdreg->bkup_mode_cnt_saved) 243 return bd9571mwv_bkup_mode_write(bdreg, mode); 244 245 return 0; 246 } 247 248 static int bd9571mwv_resume(struct device *dev) 249 { 250 struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev); 251 252 if (!bdreg->bkup_mode_enabled) 253 return 0; 254 255 /* Restore DDR Backup Mode */ 256 return bd9571mwv_bkup_mode_write(bdreg, bdreg->bkup_mode_cnt_saved); 257 } 258 259 static const struct dev_pm_ops bd9571mwv_pm = { 260 SET_SYSTEM_SLEEP_PM_OPS(bd9571mwv_suspend, bd9571mwv_resume) 261 }; 262 263 static void bd9571mwv_regulator_remove(struct platform_device *pdev) 264 { 265 device_remove_file(&pdev->dev, &dev_attr_backup_mode); 266 } 267 #define DEV_PM_OPS &bd9571mwv_pm 268 #else 269 #define DEV_PM_OPS NULL 270 #define bd9571mwv_regulator_remove NULL 271 #endif /* CONFIG_PM_SLEEP */ 272 273 static int bd9571mwv_regulator_probe(struct platform_device *pdev) 274 { 275 struct regulator_config config = { }; 276 struct bd9571mwv_reg *bdreg; 277 struct regulator_dev *rdev; 278 unsigned int val; 279 int i; 280 enum rohm_chip_type chip = platform_get_device_id(pdev)->driver_data; 281 282 bdreg = devm_kzalloc(&pdev->dev, sizeof(*bdreg), GFP_KERNEL); 283 if (!bdreg) 284 return -ENOMEM; 285 286 bdreg->regmap = dev_get_regmap(pdev->dev.parent, NULL); 287 288 platform_set_drvdata(pdev, bdreg); 289 290 config.dev = &pdev->dev; 291 config.dev->of_node = pdev->dev.parent->of_node; 292 config.driver_data = bdreg; 293 config.regmap = bdreg->regmap; 294 295 for (i = 0; i < ARRAY_SIZE(regulators); i++) { 296 /* BD9574MWF supports DVFS only */ 297 if (chip == ROHM_CHIP_TYPE_BD9574 && regulators[i].id != DVFS) 298 continue; 299 rdev = devm_regulator_register(&pdev->dev, ®ulators[i], 300 &config); 301 if (IS_ERR(rdev)) { 302 dev_err(&pdev->dev, "failed to register %s regulator\n", 303 regulators[i].name); 304 return PTR_ERR(rdev); 305 } 306 } 307 308 val = 0; 309 of_property_read_u32(config.dev->of_node, "rohm,ddr-backup-power", &val); 310 if (val & ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK) { 311 dev_err(&pdev->dev, "invalid %s mode %u\n", 312 "rohm,ddr-backup-power", val); 313 return -EINVAL; 314 } 315 bdreg->bkup_mode_cnt_keepon = val; 316 317 bdreg->rstbmode_level = of_property_read_bool(config.dev->of_node, 318 "rohm,rstbmode-level"); 319 bdreg->rstbmode_pulse = of_property_read_bool(config.dev->of_node, 320 "rohm,rstbmode-pulse"); 321 if (bdreg->rstbmode_level && bdreg->rstbmode_pulse) { 322 dev_err(&pdev->dev, "only one rohm,rstbmode-* may be specified"); 323 return -EINVAL; 324 } 325 326 #ifdef CONFIG_PM_SLEEP 327 if (bdreg->bkup_mode_cnt_keepon) { 328 int ret; 329 330 /* 331 * Backup mode is enabled by default in pulse mode, but needs 332 * explicit user setup in level mode. 333 */ 334 bdreg->bkup_mode_enabled = bdreg->rstbmode_pulse; 335 336 ret = device_create_file(&pdev->dev, &dev_attr_backup_mode); 337 if (ret) 338 return ret; 339 } 340 #endif /* CONFIG_PM_SLEEP */ 341 342 return 0; 343 } 344 345 static const struct platform_device_id bd9571mwv_regulator_id_table[] = { 346 { "bd9571mwv-regulator", ROHM_CHIP_TYPE_BD9571 }, 347 { "bd9574mwf-regulator", ROHM_CHIP_TYPE_BD9574 }, 348 { /* sentinel */ } 349 }; 350 MODULE_DEVICE_TABLE(platform, bd9571mwv_regulator_id_table); 351 352 static struct platform_driver bd9571mwv_regulator_driver = { 353 .driver = { 354 .name = "bd9571mwv-regulator", 355 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 356 .pm = DEV_PM_OPS, 357 }, 358 .probe = bd9571mwv_regulator_probe, 359 .remove_new = bd9571mwv_regulator_remove, 360 .id_table = bd9571mwv_regulator_id_table, 361 }; 362 module_platform_driver(bd9571mwv_regulator_driver); 363 364 MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>"); 365 MODULE_DESCRIPTION("BD9571MWV Regulator driver"); 366 MODULE_LICENSE("GPL v2"); 367