1 /* 2 * ROHM BD9571MWV-M regulator driver 3 * 4 * Copyright (C) 2017 Marek Vasut <marek.vasut+renesas@gmail.com> 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 * 10 * This program is distributed "as is" WITHOUT ANY WARRANTY of any 11 * kind, whether expressed or implied; without even the implied warranty 12 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License version 2 for more details. 14 * 15 * Based on the TPS65086 driver 16 * 17 * NOTE: VD09 is missing 18 */ 19 20 #include <linux/module.h> 21 #include <linux/of.h> 22 #include <linux/platform_device.h> 23 #include <linux/regulator/driver.h> 24 25 #include <linux/mfd/bd9571mwv.h> 26 27 struct bd9571mwv_reg { 28 struct bd9571mwv *bd; 29 30 /* DDR Backup Power */ 31 u8 bkup_mode_cnt_keepon; /* from "rohm,ddr-backup-power" */ 32 u8 bkup_mode_cnt_saved; 33 34 /* Power switch type */ 35 bool rstbmode_level; 36 bool rstbmode_pulse; 37 }; 38 39 enum bd9571mwv_regulators { VD09, VD18, VD25, VD33, DVFS }; 40 41 #define BD9571MWV_REG(_name, _of, _id, _ops, _vr, _vm, _nv, _min, _step, _lmin)\ 42 { \ 43 .name = _name, \ 44 .of_match = of_match_ptr(_of), \ 45 .regulators_node = "regulators", \ 46 .id = _id, \ 47 .ops = &_ops, \ 48 .n_voltages = _nv, \ 49 .type = REGULATOR_VOLTAGE, \ 50 .owner = THIS_MODULE, \ 51 .vsel_reg = _vr, \ 52 .vsel_mask = _vm, \ 53 .min_uV = _min, \ 54 .uV_step = _step, \ 55 .linear_min_sel = _lmin, \ 56 } 57 58 static int bd9571mwv_avs_get_moni_state(struct regulator_dev *rdev) 59 { 60 unsigned int val; 61 int ret; 62 63 ret = regmap_read(rdev->regmap, BD9571MWV_AVS_SET_MONI, &val); 64 if (ret != 0) 65 return ret; 66 67 return val & BD9571MWV_AVS_SET_MONI_MASK; 68 } 69 70 static int bd9571mwv_avs_set_voltage_sel_regmap(struct regulator_dev *rdev, 71 unsigned int sel) 72 { 73 int ret; 74 75 ret = bd9571mwv_avs_get_moni_state(rdev); 76 if (ret < 0) 77 return ret; 78 79 return regmap_write_bits(rdev->regmap, BD9571MWV_AVS_VD09_VID(ret), 80 rdev->desc->vsel_mask, sel); 81 } 82 83 static int bd9571mwv_avs_get_voltage_sel_regmap(struct regulator_dev *rdev) 84 { 85 unsigned int val; 86 int ret; 87 88 ret = bd9571mwv_avs_get_moni_state(rdev); 89 if (ret < 0) 90 return ret; 91 92 ret = regmap_read(rdev->regmap, BD9571MWV_AVS_VD09_VID(ret), &val); 93 if (ret != 0) 94 return ret; 95 96 val &= rdev->desc->vsel_mask; 97 val >>= ffs(rdev->desc->vsel_mask) - 1; 98 99 return val; 100 } 101 102 static int bd9571mwv_reg_set_voltage_sel_regmap(struct regulator_dev *rdev, 103 unsigned int sel) 104 { 105 return regmap_write_bits(rdev->regmap, BD9571MWV_DVFS_SETVID, 106 rdev->desc->vsel_mask, sel); 107 } 108 109 /* Operations permitted on AVS voltage regulator */ 110 static struct regulator_ops avs_ops = { 111 .set_voltage_sel = bd9571mwv_avs_set_voltage_sel_regmap, 112 .map_voltage = regulator_map_voltage_linear, 113 .get_voltage_sel = bd9571mwv_avs_get_voltage_sel_regmap, 114 .list_voltage = regulator_list_voltage_linear, 115 }; 116 117 /* Operations permitted on voltage regulators */ 118 static struct regulator_ops reg_ops = { 119 .set_voltage_sel = bd9571mwv_reg_set_voltage_sel_regmap, 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 /* Operations permitted on voltage monitors */ 126 static struct regulator_ops vid_ops = { 127 .map_voltage = regulator_map_voltage_linear, 128 .get_voltage_sel = regulator_get_voltage_sel_regmap, 129 .list_voltage = regulator_list_voltage_linear, 130 }; 131 132 static struct regulator_desc regulators[] = { 133 BD9571MWV_REG("VD09", "vd09", VD09, avs_ops, 0, 0x7f, 134 0x80, 600000, 10000, 0x3c), 135 BD9571MWV_REG("VD18", "vd18", VD18, vid_ops, BD9571MWV_VD18_VID, 0xf, 136 16, 1625000, 25000, 0), 137 BD9571MWV_REG("VD25", "vd25", VD25, vid_ops, BD9571MWV_VD25_VID, 0xf, 138 16, 2150000, 50000, 0), 139 BD9571MWV_REG("VD33", "vd33", VD33, vid_ops, BD9571MWV_VD33_VID, 0xf, 140 11, 2800000, 100000, 0), 141 BD9571MWV_REG("DVFS", "dvfs", DVFS, reg_ops, 142 BD9571MWV_DVFS_MONIVDAC, 0x7f, 143 0x80, 600000, 10000, 0x3c), 144 }; 145 146 #ifdef CONFIG_PM_SLEEP 147 static int bd9571mwv_bkup_mode_read(struct bd9571mwv *bd, unsigned int *mode) 148 { 149 int ret; 150 151 ret = regmap_read(bd->regmap, BD9571MWV_BKUP_MODE_CNT, mode); 152 if (ret) { 153 dev_err(bd->dev, "failed to read backup mode (%d)\n", ret); 154 return ret; 155 } 156 157 return 0; 158 } 159 160 static int bd9571mwv_bkup_mode_write(struct bd9571mwv *bd, unsigned int mode) 161 { 162 int ret; 163 164 ret = regmap_write(bd->regmap, BD9571MWV_BKUP_MODE_CNT, mode); 165 if (ret) { 166 dev_err(bd->dev, "failed to configure backup mode 0x%x (%d)\n", 167 mode, ret); 168 return ret; 169 } 170 171 return 0; 172 } 173 174 static int bd9571mwv_suspend(struct device *dev) 175 { 176 struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev); 177 unsigned int mode; 178 int ret; 179 180 if (!device_may_wakeup(dev)) 181 return 0; 182 183 /* Save DDR Backup Mode */ 184 ret = bd9571mwv_bkup_mode_read(bdreg->bd, &mode); 185 if (ret) 186 return ret; 187 188 bdreg->bkup_mode_cnt_saved = mode; 189 190 if (!bdreg->rstbmode_pulse) 191 return 0; 192 193 /* Enable DDR Backup Mode */ 194 mode &= ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK; 195 mode |= bdreg->bkup_mode_cnt_keepon; 196 197 if (mode != bdreg->bkup_mode_cnt_saved) 198 return bd9571mwv_bkup_mode_write(bdreg->bd, mode); 199 200 return 0; 201 } 202 203 static int bd9571mwv_resume(struct device *dev) 204 { 205 struct bd9571mwv_reg *bdreg = dev_get_drvdata(dev); 206 207 if (!device_may_wakeup(dev)) 208 return 0; 209 210 /* Restore DDR Backup Mode */ 211 return bd9571mwv_bkup_mode_write(bdreg->bd, bdreg->bkup_mode_cnt_saved); 212 } 213 214 static const struct dev_pm_ops bd9571mwv_pm = { 215 SET_SYSTEM_SLEEP_PM_OPS(bd9571mwv_suspend, bd9571mwv_resume) 216 }; 217 218 #define DEV_PM_OPS &bd9571mwv_pm 219 #else 220 #define DEV_PM_OPS NULL 221 #endif /* CONFIG_PM_SLEEP */ 222 223 static int bd9571mwv_regulator_probe(struct platform_device *pdev) 224 { 225 struct bd9571mwv *bd = dev_get_drvdata(pdev->dev.parent); 226 struct regulator_config config = { }; 227 struct bd9571mwv_reg *bdreg; 228 struct regulator_dev *rdev; 229 unsigned int val; 230 int i; 231 232 bdreg = devm_kzalloc(&pdev->dev, sizeof(*bdreg), GFP_KERNEL); 233 if (!bdreg) 234 return -ENOMEM; 235 236 bdreg->bd = bd; 237 238 platform_set_drvdata(pdev, bdreg); 239 240 config.dev = &pdev->dev; 241 config.dev->of_node = bd->dev->of_node; 242 config.driver_data = bd; 243 config.regmap = bd->regmap; 244 245 for (i = 0; i < ARRAY_SIZE(regulators); i++) { 246 rdev = devm_regulator_register(&pdev->dev, ®ulators[i], 247 &config); 248 if (IS_ERR(rdev)) { 249 dev_err(bd->dev, "failed to register %s regulator\n", 250 pdev->name); 251 return PTR_ERR(rdev); 252 } 253 } 254 255 val = 0; 256 of_property_read_u32(bd->dev->of_node, "rohm,ddr-backup-power", &val); 257 if (val & ~BD9571MWV_BKUP_MODE_CNT_KEEPON_MASK) { 258 dev_err(bd->dev, "invalid %s mode %u\n", 259 "rohm,ddr-backup-power", val); 260 return -EINVAL; 261 } 262 bdreg->bkup_mode_cnt_keepon = val; 263 264 bdreg->rstbmode_level = of_property_read_bool(bd->dev->of_node, 265 "rohm,rstbmode-level"); 266 bdreg->rstbmode_pulse = of_property_read_bool(bd->dev->of_node, 267 "rohm,rstbmode-pulse"); 268 if (bdreg->rstbmode_level && bdreg->rstbmode_pulse) { 269 dev_err(bd->dev, "only one rohm,rstbmode-* may be specified"); 270 return -EINVAL; 271 } 272 273 if (bdreg->bkup_mode_cnt_keepon) { 274 device_set_wakeup_capable(&pdev->dev, true); 275 /* 276 * Wakeup is enabled by default in pulse mode, but needs 277 * explicit user setup in level mode. 278 */ 279 device_set_wakeup_enable(&pdev->dev, bdreg->rstbmode_pulse); 280 } 281 282 return 0; 283 } 284 285 static const struct platform_device_id bd9571mwv_regulator_id_table[] = { 286 { "bd9571mwv-regulator", }, 287 { /* sentinel */ } 288 }; 289 MODULE_DEVICE_TABLE(platform, bd9571mwv_regulator_id_table); 290 291 static struct platform_driver bd9571mwv_regulator_driver = { 292 .driver = { 293 .name = "bd9571mwv-regulator", 294 .pm = DEV_PM_OPS, 295 }, 296 .probe = bd9571mwv_regulator_probe, 297 .id_table = bd9571mwv_regulator_id_table, 298 }; 299 module_platform_driver(bd9571mwv_regulator_driver); 300 301 MODULE_AUTHOR("Marek Vasut <marek.vasut+renesas@gmail.com>"); 302 MODULE_DESCRIPTION("BD9571MWV Regulator driver"); 303 MODULE_LICENSE("GPL v2"); 304