1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * ROHM BD9571MWV-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/module.h> 13 #include <linux/of.h> 14 #include <linux/platform_device.h> 15 #include <linux/regulator/driver.h> 16 17 #include <linux/mfd/bd9571mwv.h> 18 19 struct bd9571mwv_reg { 20 struct bd9571mwv *bd; 21 22 /* DDR Backup Power */ 23 u8 bkup_mode_cnt_keepon; /* from "rohm,ddr-backup-power" */ 24 u8 bkup_mode_cnt_saved; 25 bool bkup_mode_enabled; 26 27 /* Power switch type */ 28 bool rstbmode_level; 29 bool rstbmode_pulse; 30 }; 31 32 enum bd9571mwv_regulators { VD09, VD18, VD25, VD33, DVFS }; 33 34 #define BD9571MWV_REG(_name, _of, _id, _ops, _vr, _vm, _nv, _min, _step, _lmin)\ 35 { \ 36 .name = _name, \ 37 .of_match = of_match_ptr(_of), \ 38 .regulators_node = "regulators", \ 39 .id = _id, \ 40 .ops = &_ops, \ 41 .n_voltages = _nv, \ 42 .type = REGULATOR_VOLTAGE, \ 43 .owner = THIS_MODULE, \ 44 .vsel_reg = _vr, \ 45 .vsel_mask = _vm, \ 46 .min_uV = _min, \ 47 .uV_step = _step, \ 48 .linear_min_sel = _lmin, \ 49 } 50 51 static int bd9571mwv_avs_get_moni_state(struct regulator_dev *rdev) 52 { 53 unsigned int val; 54 int ret; 55 56 ret = regmap_read(rdev->regmap, BD9571MWV_AVS_SET_MONI, &val); 57 if (ret != 0) 58 return ret; 59 60 return val & BD9571MWV_AVS_SET_MONI_MASK; 61 } 62 63 static int bd9571mwv_avs_set_voltage_sel_regmap(struct regulator_dev *rdev, 64 unsigned int sel) 65 { 66 int ret; 67 68 ret = bd9571mwv_avs_get_moni_state(rdev); 69 if (ret < 0) 70 return ret; 71 72 return regmap_write_bits(rdev->regmap, BD9571MWV_AVS_VD09_VID(ret), 73 rdev->desc->vsel_mask, sel); 74 } 75 76 static int bd9571mwv_avs_get_voltage_sel_regmap(struct regulator_dev *rdev) 77 { 78 unsigned int val; 79 int ret; 80 81 ret = bd9571mwv_avs_get_moni_state(rdev); 82 if (ret < 0) 83 return ret; 84 85 ret = regmap_read(rdev->regmap, BD9571MWV_AVS_VD09_VID(ret), &val); 86 if (ret != 0) 87 return ret; 88 89 val &= rdev->desc->vsel_mask; 90 val >>= ffs(rdev->desc->vsel_mask) - 1; 91 92 return val; 93 } 94 95 static int bd9571mwv_reg_set_voltage_sel_regmap(struct regulator_dev *rdev, 96 unsigned int sel) 97 { 98 return regmap_write_bits(rdev->regmap, BD9571MWV_DVFS_SETVID, 99 rdev->desc->vsel_mask, sel); 100 } 101 102 /* Operations permitted on AVS voltage regulator */ 103 static const struct regulator_ops avs_ops = { 104 .set_voltage_sel = bd9571mwv_avs_set_voltage_sel_regmap, 105 .map_voltage = regulator_map_voltage_linear, 106 .get_voltage_sel = bd9571mwv_avs_get_voltage_sel_regmap, 107 .list_voltage = regulator_list_voltage_linear, 108 }; 109 110 /* Operations permitted on voltage regulators */ 111 static const struct regulator_ops reg_ops = { 112 .set_voltage_sel = bd9571mwv_reg_set_voltage_sel_regmap, 113 .map_voltage = regulator_map_voltage_linear, 114 .get_voltage_sel = regulator_get_voltage_sel_regmap, 115 .list_voltage = regulator_list_voltage_linear, 116 }; 117 118 /* Operations permitted on voltage monitors */ 119 static const struct regulator_ops vid_ops = { 120 .map_voltage = regulator_map_voltage_linear, 121 .get_voltage_sel = regulator_get_voltage_sel_regmap, 122 .list_voltage = regulator_list_voltage_linear, 123 }; 124 125 static const struct regulator_desc regulators[] = { 126 BD9571MWV_REG("VD09", "vd09", VD09, avs_ops, 0, 0x7f, 127 0x80, 600000, 10000, 0x3c), 128 BD9571MWV_REG("VD18", "vd18", VD18, vid_ops, BD9571MWV_VD18_VID, 0xf, 129 16, 1625000, 25000, 0), 130 BD9571MWV_REG("VD25", "vd25", VD25, vid_ops, BD9571MWV_VD25_VID, 0xf, 131 16, 2150000, 50000, 0), 132 BD9571MWV_REG("VD33", "vd33", VD33, vid_ops, BD9571MWV_VD33_VID, 0xf, 133 11, 2800000, 100000, 0), 134 BD9571MWV_REG("DVFS", "dvfs", DVFS, reg_ops, 135 BD9571MWV_DVFS_MONIVDAC, 0x7f, 136 0x80, 600000, 10000, 0x3c), 137 }; 138 139 #ifdef CONFIG_PM_SLEEP 140 static int bd9571mwv_bkup_mode_read(struct bd9571mwv *bd, unsigned int *mode) 141 { 142 int ret; 143 144 ret = regmap_read(bd->regmap, BD9571MWV_BKUP_MODE_CNT, mode); 145 if (ret) { 146 dev_err(bd->dev, "failed to read backup mode (%d)\n", ret); 147 return ret; 148 } 149 150 return 0; 151 } 152 153 static int bd9571mwv_bkup_mode_write(struct bd9571mwv *bd, unsigned int mode) 154 { 155 int ret; 156 157 ret = regmap_write(bd->regmap, BD9571MWV_BKUP_MODE_CNT, mode); 158 if (ret) { 159 dev_err(bd->dev, "failed to configure backup mode 0x%x (%d)\n", 160 mode, ret); 161 return ret; 162 } 163 164 return 0; 165 } 166 167 static ssize_t backup_mode_show(struct device *dev, 168 struct device_attribute *attr, char *buf) 169 { 170 struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev); 171 172 return sprintf(buf, "%s\n", bdreg->bkup_mode_enabled ? "on" : "off"); 173 } 174 175 static ssize_t backup_mode_store(struct device *dev, 176 struct device_attribute *attr, 177 const char *buf, size_t count) 178 { 179 struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev); 180 unsigned int mode; 181 int ret; 182 183 if (!count) 184 return 0; 185 186 ret = kstrtobool(buf, &bdreg->bkup_mode_enabled); 187 if (ret) 188 return ret; 189 190 if (!bdreg->rstbmode_level) 191 return count; 192 193 /* 194 * Configure DDR Backup Mode, to change the role of the accessory power 195 * switch from a power switch to a wake-up switch, or vice versa 196 */ 197 ret = bd9571mwv_bkup_mode_read(bdreg->bd, &mode); 198 if (ret) 199 return ret; 200 201 mode &= ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK; 202 if (bdreg->bkup_mode_enabled) 203 mode |= bdreg->bkup_mode_cnt_keepon; 204 205 ret = bd9571mwv_bkup_mode_write(bdreg->bd, mode); 206 if (ret) 207 return ret; 208 209 return count; 210 } 211 212 static DEVICE_ATTR_RW(backup_mode); 213 214 static int bd9571mwv_suspend(struct device *dev) 215 { 216 struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev); 217 unsigned int mode; 218 int ret; 219 220 if (!bdreg->bkup_mode_enabled) 221 return 0; 222 223 /* Save DDR Backup Mode */ 224 ret = bd9571mwv_bkup_mode_read(bdreg->bd, &mode); 225 if (ret) 226 return ret; 227 228 bdreg->bkup_mode_cnt_saved = mode; 229 230 if (!bdreg->rstbmode_pulse) 231 return 0; 232 233 /* Enable DDR Backup Mode */ 234 mode &= ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK; 235 mode |= bdreg->bkup_mode_cnt_keepon; 236 237 if (mode != bdreg->bkup_mode_cnt_saved) 238 return bd9571mwv_bkup_mode_write(bdreg->bd, mode); 239 240 return 0; 241 } 242 243 static int bd9571mwv_resume(struct device *dev) 244 { 245 struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev); 246 247 if (!bdreg->bkup_mode_enabled) 248 return 0; 249 250 /* Restore DDR Backup Mode */ 251 return bd9571mwv_bkup_mode_write(bdreg->bd, bdreg->bkup_mode_cnt_saved); 252 } 253 254 static const struct dev_pm_ops bd9571mwv_pm = { 255 SET_SYSTEM_SLEEP_PM_OPS(bd9571mwv_suspend, bd9571mwv_resume) 256 }; 257 258 static int bd9571mwv_regulator_remove(struct platform_device *pdev) 259 { 260 device_remove_file(&pdev->dev, &dev_attr_backup_mode); 261 return 0; 262 } 263 #define DEV_PM_OPS &bd9571mwv_pm 264 #else 265 #define DEV_PM_OPS NULL 266 #define bd9571mwv_regulator_remove NULL 267 #endif /* CONFIG_PM_SLEEP */ 268 269 static int bd9571mwv_regulator_probe(struct platform_device *pdev) 270 { 271 struct bd9571mwv *bd = dev_get_drvdata(pdev->dev.parent); 272 struct regulator_config config = { }; 273 struct bd9571mwv_reg *bdreg; 274 struct regulator_dev *rdev; 275 unsigned int val; 276 int i; 277 278 bdreg = devm_kzalloc(&pdev->dev, sizeof(*bdreg), GFP_KERNEL); 279 if (!bdreg) 280 return -ENOMEM; 281 282 bdreg->bd = bd; 283 284 platform_set_drvdata(pdev, bdreg); 285 286 config.dev = &pdev->dev; 287 config.dev->of_node = bd->dev->of_node; 288 config.driver_data = bd; 289 config.regmap = bd->regmap; 290 291 for (i = 0; i < ARRAY_SIZE(regulators); i++) { 292 rdev = devm_regulator_register(&pdev->dev, ®ulators[i], 293 &config); 294 if (IS_ERR(rdev)) { 295 dev_err(bd->dev, "failed to register %s regulator\n", 296 pdev->name); 297 return PTR_ERR(rdev); 298 } 299 } 300 301 val = 0; 302 of_property_read_u32(bd->dev->of_node, "rohm,ddr-backup-power", &val); 303 if (val & ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK) { 304 dev_err(bd->dev, "invalid %s mode %u\n", 305 "rohm,ddr-backup-power", val); 306 return -EINVAL; 307 } 308 bdreg->bkup_mode_cnt_keepon = val; 309 310 bdreg->rstbmode_level = of_property_read_bool(bd->dev->of_node, 311 "rohm,rstbmode-level"); 312 bdreg->rstbmode_pulse = of_property_read_bool(bd->dev->of_node, 313 "rohm,rstbmode-pulse"); 314 if (bdreg->rstbmode_level && bdreg->rstbmode_pulse) { 315 dev_err(bd->dev, "only one rohm,rstbmode-* may be specified"); 316 return -EINVAL; 317 } 318 319 #ifdef CONFIG_PM_SLEEP 320 if (bdreg->bkup_mode_cnt_keepon) { 321 int ret; 322 323 /* 324 * Backup mode is enabled by default in pulse mode, but needs 325 * explicit user setup in level mode. 326 */ 327 bdreg->bkup_mode_enabled = bdreg->rstbmode_pulse; 328 329 ret = device_create_file(&pdev->dev, &dev_attr_backup_mode); 330 if (ret) 331 return ret; 332 } 333 #endif /* CONFIG_PM_SLEEP */ 334 335 return 0; 336 } 337 338 static const struct platform_device_id bd9571mwv_regulator_id_table[] = { 339 { "bd9571mwv-regulator", }, 340 { /* sentinel */ } 341 }; 342 MODULE_DEVICE_TABLE(platform, bd9571mwv_regulator_id_table); 343 344 static struct platform_driver bd9571mwv_regulator_driver = { 345 .driver = { 346 .name = "bd9571mwv-regulator", 347 .pm = DEV_PM_OPS, 348 }, 349 .probe = bd9571mwv_regulator_probe, 350 .remove = bd9571mwv_regulator_remove, 351 .id_table = bd9571mwv_regulator_id_table, 352 }; 353 module_platform_driver(bd9571mwv_regulator_driver); 354 355 MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>"); 356 MODULE_DESCRIPTION("BD9571MWV Regulator driver"); 357 MODULE_LICENSE("GPL v2"); 358