1 // SPDX-License-Identifier: GPL-2.0 2 // 3 // MCP16502 PMIC driver 4 // 5 // Copyright (C) 2018 Microchip Technology Inc. and its subsidiaries 6 // 7 // Author: Andrei Stefanescu <andrei.stefanescu@microchip.com> 8 // 9 // Inspired from tps65086-regulator.c 10 11 #include <linux/gpio.h> 12 #include <linux/i2c.h> 13 #include <linux/init.h> 14 #include <linux/kernel.h> 15 #include <linux/module.h> 16 #include <linux/of.h> 17 #include <linux/regmap.h> 18 #include <linux/regulator/driver.h> 19 #include <linux/suspend.h> 20 #include <linux/gpio/consumer.h> 21 22 #define VDD_LOW_SEL 0x0D 23 #define VDD_HIGH_SEL 0x3F 24 25 #define MCP16502_FLT BIT(7) 26 #define MCP16502_ENS BIT(0) 27 28 /* 29 * The PMIC has four sets of registers corresponding to four power modes: 30 * Performance, Active, Low-power, Hibernate. 31 * 32 * Registers: 33 * Each regulator has a register for each power mode. To access a register 34 * for a specific regulator and mode BASE_* and OFFSET_* need to be added. 35 * 36 * Operating modes: 37 * In order for the PMIC to transition to operating modes it has to be 38 * controlled via GPIO lines called LPM and HPM. 39 * 40 * The registers are fully configurable such that you can put all regulators in 41 * a low-power state while the PMIC is in Active mode. They are supposed to be 42 * configured at startup and then simply transition to/from a global low-power 43 * state by setting the GPIO lpm pin high/low. 44 * 45 * This driver keeps the PMIC in Active mode, Low-power state is set for the 46 * regulators by enabling/disabling operating mode (FPWM or Auto PFM). 47 * 48 * The PMIC's Low-power and Hibernate modes are used during standby/suspend. 49 * To enter standby/suspend the PMIC will go to Low-power mode. From there, it 50 * will transition to Hibernate when the PWRHLD line is set to low by the MPU. 51 */ 52 53 /* 54 * This function is useful for iterating over all regulators and accessing their 55 * registers in a generic way or accessing a regulator device by its id. 56 */ 57 #define MCP16502_BASE(i) (((i) + 1) << 4) 58 #define MCP16502_STAT_BASE(i) ((i) + 5) 59 60 #define MCP16502_OFFSET_MODE_A 0 61 #define MCP16502_OFFSET_MODE_LPM 1 62 #define MCP16502_OFFSET_MODE_HIB 2 63 64 #define MCP16502_OPMODE_ACTIVE REGULATOR_MODE_NORMAL 65 #define MCP16502_OPMODE_LPM REGULATOR_MODE_IDLE 66 #define MCP16502_OPMODE_HIB REGULATOR_MODE_STANDBY 67 68 #define MCP16502_MODE_AUTO_PFM 0 69 #define MCP16502_MODE_FPWM BIT(6) 70 71 #define MCP16502_VSEL 0x3F 72 #define MCP16502_EN BIT(7) 73 #define MCP16502_MODE BIT(6) 74 75 #define MCP16502_MIN_REG 0x0 76 #define MCP16502_MAX_REG 0x65 77 78 static unsigned int mcp16502_of_map_mode(unsigned int mode) 79 { 80 if (mode == REGULATOR_MODE_NORMAL || mode == REGULATOR_MODE_IDLE) 81 return mode; 82 83 return REGULATOR_MODE_INVALID; 84 } 85 86 #define MCP16502_REGULATOR(_name, _id, _ranges, _ops) \ 87 [_id] = { \ 88 .name = _name, \ 89 .regulators_node = of_match_ptr("regulators"), \ 90 .id = _id, \ 91 .ops = &(_ops), \ 92 .type = REGULATOR_VOLTAGE, \ 93 .owner = THIS_MODULE, \ 94 .n_voltages = MCP16502_VSEL + 1, \ 95 .linear_ranges = _ranges, \ 96 .n_linear_ranges = ARRAY_SIZE(_ranges), \ 97 .of_match = of_match_ptr(_name), \ 98 .of_map_mode = mcp16502_of_map_mode, \ 99 .vsel_reg = (((_id) + 1) << 4), \ 100 .vsel_mask = MCP16502_VSEL, \ 101 .enable_reg = (((_id) + 1) << 4), \ 102 .enable_mask = MCP16502_EN, \ 103 } 104 105 enum { 106 BUCK1 = 0, 107 BUCK2, 108 BUCK3, 109 BUCK4, 110 LDO1, 111 LDO2, 112 NUM_REGULATORS 113 }; 114 115 /* 116 * struct mcp16502 - PMIC representation 117 * @rdev: the regulators belonging to this chip 118 * @rmap: regmap to be used for I2C communication 119 * @lpm: LPM GPIO descriptor 120 */ 121 struct mcp16502 { 122 struct gpio_desc *lpm; 123 }; 124 125 /* 126 * mcp16502_gpio_set_mode() - set the GPIO corresponding value 127 * 128 * Used to prepare transitioning into hibernate or resuming from it. 129 */ 130 static void mcp16502_gpio_set_mode(struct mcp16502 *mcp, int mode) 131 { 132 switch (mode) { 133 case MCP16502_OPMODE_ACTIVE: 134 gpiod_set_value(mcp->lpm, 0); 135 break; 136 case MCP16502_OPMODE_LPM: 137 case MCP16502_OPMODE_HIB: 138 gpiod_set_value(mcp->lpm, 1); 139 break; 140 default: 141 pr_err("%s: %d invalid\n", __func__, mode); 142 } 143 } 144 145 /* 146 * mcp16502_get_reg() - get the PMIC's configuration register for opmode 147 * 148 * @rdev: the regulator whose register we are searching 149 * @opmode: the PMIC's operating mode ACTIVE, Low-power, Hibernate 150 */ 151 static int mcp16502_get_reg(struct regulator_dev *rdev, int opmode) 152 { 153 int reg = MCP16502_BASE(rdev_get_id(rdev)); 154 155 switch (opmode) { 156 case MCP16502_OPMODE_ACTIVE: 157 return reg + MCP16502_OFFSET_MODE_A; 158 case MCP16502_OPMODE_LPM: 159 return reg + MCP16502_OFFSET_MODE_LPM; 160 case MCP16502_OPMODE_HIB: 161 return reg + MCP16502_OFFSET_MODE_HIB; 162 default: 163 return -EINVAL; 164 } 165 } 166 167 /* 168 * mcp16502_get_mode() - return the current operating mode of a regulator 169 * 170 * Note: all functions that are not part of entering/exiting standby/suspend 171 * use the Active mode registers. 172 * 173 * Note: this is different from the PMIC's operatig mode, it is the 174 * MODE bit from the regulator's register. 175 */ 176 static unsigned int mcp16502_get_mode(struct regulator_dev *rdev) 177 { 178 unsigned int val; 179 int ret, reg; 180 181 reg = mcp16502_get_reg(rdev, MCP16502_OPMODE_ACTIVE); 182 if (reg < 0) 183 return reg; 184 185 ret = regmap_read(rdev->regmap, reg, &val); 186 if (ret) 187 return ret; 188 189 switch (val & MCP16502_MODE) { 190 case MCP16502_MODE_FPWM: 191 return REGULATOR_MODE_NORMAL; 192 case MCP16502_MODE_AUTO_PFM: 193 return REGULATOR_MODE_IDLE; 194 default: 195 return REGULATOR_MODE_INVALID; 196 } 197 } 198 199 /* 200 * _mcp16502_set_mode() - helper for set_mode and set_suspend_mode 201 * 202 * @rdev: the regulator for which we are setting the mode 203 * @mode: the regulator's mode (the one from MODE bit) 204 * @opmode: the PMIC's operating mode: Active/Low-power/Hibernate 205 */ 206 static int _mcp16502_set_mode(struct regulator_dev *rdev, unsigned int mode, 207 unsigned int op_mode) 208 { 209 int val; 210 int reg; 211 212 reg = mcp16502_get_reg(rdev, op_mode); 213 if (reg < 0) 214 return reg; 215 216 switch (mode) { 217 case REGULATOR_MODE_NORMAL: 218 val = MCP16502_MODE_FPWM; 219 break; 220 case REGULATOR_MODE_IDLE: 221 val = MCP16502_MODE_AUTO_PFM; 222 break; 223 default: 224 return -EINVAL; 225 } 226 227 reg = regmap_update_bits(rdev->regmap, reg, MCP16502_MODE, val); 228 return reg; 229 } 230 231 /* 232 * mcp16502_set_mode() - regulator_ops set_mode 233 */ 234 static int mcp16502_set_mode(struct regulator_dev *rdev, unsigned int mode) 235 { 236 return _mcp16502_set_mode(rdev, mode, MCP16502_OPMODE_ACTIVE); 237 } 238 239 /* 240 * mcp16502_get_status() - regulator_ops get_status 241 */ 242 static int mcp16502_get_status(struct regulator_dev *rdev) 243 { 244 int ret; 245 unsigned int val; 246 247 ret = regmap_read(rdev->regmap, MCP16502_STAT_BASE(rdev_get_id(rdev)), 248 &val); 249 if (ret) 250 return ret; 251 252 if (val & MCP16502_FLT) 253 return REGULATOR_STATUS_ERROR; 254 else if (val & MCP16502_ENS) 255 return REGULATOR_STATUS_ON; 256 else if (!(val & MCP16502_ENS)) 257 return REGULATOR_STATUS_OFF; 258 259 return REGULATOR_STATUS_UNDEFINED; 260 } 261 262 #ifdef CONFIG_SUSPEND 263 /* 264 * mcp16502_suspend_get_target_reg() - get the reg of the target suspend PMIC 265 * mode 266 */ 267 static int mcp16502_suspend_get_target_reg(struct regulator_dev *rdev) 268 { 269 switch (pm_suspend_target_state) { 270 case PM_SUSPEND_STANDBY: 271 return mcp16502_get_reg(rdev, MCP16502_OPMODE_LPM); 272 case PM_SUSPEND_ON: 273 case PM_SUSPEND_MEM: 274 return mcp16502_get_reg(rdev, MCP16502_OPMODE_HIB); 275 default: 276 dev_err(&rdev->dev, "invalid suspend target: %d\n", 277 pm_suspend_target_state); 278 } 279 280 return -EINVAL; 281 } 282 283 /* 284 * mcp16502_set_suspend_voltage() - regulator_ops set_suspend_voltage 285 */ 286 static int mcp16502_set_suspend_voltage(struct regulator_dev *rdev, int uV) 287 { 288 int sel = regulator_map_voltage_linear_range(rdev, uV, uV); 289 int reg = mcp16502_suspend_get_target_reg(rdev); 290 291 if (sel < 0) 292 return sel; 293 294 if (reg < 0) 295 return reg; 296 297 return regmap_update_bits(rdev->regmap, reg, MCP16502_VSEL, sel); 298 } 299 300 /* 301 * mcp16502_set_suspend_mode() - regulator_ops set_suspend_mode 302 */ 303 static int mcp16502_set_suspend_mode(struct regulator_dev *rdev, 304 unsigned int mode) 305 { 306 switch (pm_suspend_target_state) { 307 case PM_SUSPEND_STANDBY: 308 return _mcp16502_set_mode(rdev, mode, MCP16502_OPMODE_LPM); 309 case PM_SUSPEND_ON: 310 case PM_SUSPEND_MEM: 311 return _mcp16502_set_mode(rdev, mode, MCP16502_OPMODE_HIB); 312 default: 313 dev_err(&rdev->dev, "invalid suspend target: %d\n", 314 pm_suspend_target_state); 315 } 316 317 return -EINVAL; 318 } 319 320 /* 321 * mcp16502_set_suspend_enable() - regulator_ops set_suspend_enable 322 */ 323 static int mcp16502_set_suspend_enable(struct regulator_dev *rdev) 324 { 325 int reg = mcp16502_suspend_get_target_reg(rdev); 326 327 if (reg < 0) 328 return reg; 329 330 return regmap_update_bits(rdev->regmap, reg, MCP16502_EN, MCP16502_EN); 331 } 332 333 /* 334 * mcp16502_set_suspend_disable() - regulator_ops set_suspend_disable 335 */ 336 static int mcp16502_set_suspend_disable(struct regulator_dev *rdev) 337 { 338 int reg = mcp16502_suspend_get_target_reg(rdev); 339 340 if (reg < 0) 341 return reg; 342 343 return regmap_update_bits(rdev->regmap, reg, MCP16502_EN, 0); 344 } 345 #endif /* CONFIG_SUSPEND */ 346 347 static const struct regulator_ops mcp16502_buck_ops = { 348 .list_voltage = regulator_list_voltage_linear_range, 349 .map_voltage = regulator_map_voltage_linear_range, 350 .get_voltage_sel = regulator_get_voltage_sel_regmap, 351 .set_voltage_sel = regulator_set_voltage_sel_regmap, 352 .enable = regulator_enable_regmap, 353 .disable = regulator_disable_regmap, 354 .is_enabled = regulator_is_enabled_regmap, 355 .get_status = mcp16502_get_status, 356 357 .set_mode = mcp16502_set_mode, 358 .get_mode = mcp16502_get_mode, 359 360 #ifdef CONFIG_SUSPEND 361 .set_suspend_voltage = mcp16502_set_suspend_voltage, 362 .set_suspend_mode = mcp16502_set_suspend_mode, 363 .set_suspend_enable = mcp16502_set_suspend_enable, 364 .set_suspend_disable = mcp16502_set_suspend_disable, 365 #endif /* CONFIG_SUSPEND */ 366 }; 367 368 /* 369 * LDOs cannot change operating modes. 370 */ 371 static const struct regulator_ops mcp16502_ldo_ops = { 372 .list_voltage = regulator_list_voltage_linear_range, 373 .map_voltage = regulator_map_voltage_linear_range, 374 .get_voltage_sel = regulator_get_voltage_sel_regmap, 375 .set_voltage_sel = regulator_set_voltage_sel_regmap, 376 .enable = regulator_enable_regmap, 377 .disable = regulator_disable_regmap, 378 .is_enabled = regulator_is_enabled_regmap, 379 .get_status = mcp16502_get_status, 380 381 #ifdef CONFIG_SUSPEND 382 .set_suspend_voltage = mcp16502_set_suspend_voltage, 383 .set_suspend_enable = mcp16502_set_suspend_enable, 384 .set_suspend_disable = mcp16502_set_suspend_disable, 385 #endif /* CONFIG_SUSPEND */ 386 }; 387 388 static const struct of_device_id mcp16502_ids[] = { 389 { .compatible = "microchip,mcp16502", }, 390 {} 391 }; 392 MODULE_DEVICE_TABLE(of, mcp16502_ids); 393 394 static const struct regulator_linear_range b1l12_ranges[] = { 395 REGULATOR_LINEAR_RANGE(1200000, VDD_LOW_SEL, VDD_HIGH_SEL, 50000), 396 }; 397 398 static const struct regulator_linear_range b234_ranges[] = { 399 REGULATOR_LINEAR_RANGE(600000, VDD_LOW_SEL, VDD_HIGH_SEL, 25000), 400 }; 401 402 static const struct regulator_desc mcp16502_desc[] = { 403 /* MCP16502_REGULATOR(_name, _id, ranges, regulator_ops) */ 404 MCP16502_REGULATOR("VDD_IO", BUCK1, b1l12_ranges, mcp16502_buck_ops), 405 MCP16502_REGULATOR("VDD_DDR", BUCK2, b234_ranges, mcp16502_buck_ops), 406 MCP16502_REGULATOR("VDD_CORE", BUCK3, b234_ranges, mcp16502_buck_ops), 407 MCP16502_REGULATOR("VDD_OTHER", BUCK4, b234_ranges, mcp16502_buck_ops), 408 MCP16502_REGULATOR("LDO1", LDO1, b1l12_ranges, mcp16502_ldo_ops), 409 MCP16502_REGULATOR("LDO2", LDO2, b1l12_ranges, mcp16502_ldo_ops) 410 }; 411 412 static const struct regmap_range mcp16502_ranges[] = { 413 regmap_reg_range(MCP16502_MIN_REG, MCP16502_MAX_REG) 414 }; 415 416 static const struct regmap_access_table mcp16502_yes_reg_table = { 417 .yes_ranges = mcp16502_ranges, 418 .n_yes_ranges = ARRAY_SIZE(mcp16502_ranges), 419 }; 420 421 static const struct regmap_config mcp16502_regmap_config = { 422 .reg_bits = 8, 423 .val_bits = 8, 424 .max_register = MCP16502_MAX_REG, 425 .cache_type = REGCACHE_NONE, 426 .rd_table = &mcp16502_yes_reg_table, 427 .wr_table = &mcp16502_yes_reg_table, 428 }; 429 430 static int mcp16502_probe(struct i2c_client *client, 431 const struct i2c_device_id *id) 432 { 433 struct regulator_config config = { }; 434 struct regulator_dev *rdev; 435 struct device *dev; 436 struct mcp16502 *mcp; 437 struct regmap *rmap; 438 int i, ret; 439 440 dev = &client->dev; 441 config.dev = dev; 442 443 mcp = devm_kzalloc(dev, sizeof(*mcp), GFP_KERNEL); 444 if (!mcp) 445 return -ENOMEM; 446 447 rmap = devm_regmap_init_i2c(client, &mcp16502_regmap_config); 448 if (IS_ERR(rmap)) { 449 ret = PTR_ERR(rmap); 450 dev_err(dev, "regmap init failed: %d\n", ret); 451 return ret; 452 } 453 454 i2c_set_clientdata(client, mcp); 455 config.regmap = rmap; 456 config.driver_data = mcp; 457 458 mcp->lpm = devm_gpiod_get(dev, "lpm", GPIOD_OUT_LOW); 459 if (IS_ERR(mcp->lpm)) { 460 dev_err(dev, "failed to get lpm pin: %ld\n", PTR_ERR(mcp->lpm)); 461 return PTR_ERR(mcp->lpm); 462 } 463 464 for (i = 0; i < NUM_REGULATORS; i++) { 465 rdev = devm_regulator_register(dev, &mcp16502_desc[i], &config); 466 if (IS_ERR(rdev)) { 467 dev_err(dev, 468 "failed to register %s regulator %ld\n", 469 mcp16502_desc[i].name, PTR_ERR(rdev)); 470 return PTR_ERR(rdev); 471 } 472 } 473 474 mcp16502_gpio_set_mode(mcp, MCP16502_OPMODE_ACTIVE); 475 476 return 0; 477 } 478 479 #ifdef CONFIG_PM_SLEEP 480 static int mcp16502_suspend_noirq(struct device *dev) 481 { 482 struct i2c_client *client = to_i2c_client(dev); 483 struct mcp16502 *mcp = i2c_get_clientdata(client); 484 485 mcp16502_gpio_set_mode(mcp, MCP16502_OPMODE_LPM); 486 487 return 0; 488 } 489 490 static int mcp16502_resume_noirq(struct device *dev) 491 { 492 struct i2c_client *client = to_i2c_client(dev); 493 struct mcp16502 *mcp = i2c_get_clientdata(client); 494 495 mcp16502_gpio_set_mode(mcp, MCP16502_OPMODE_ACTIVE); 496 497 return 0; 498 } 499 #endif 500 501 #ifdef CONFIG_PM 502 static const struct dev_pm_ops mcp16502_pm_ops = { 503 SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(mcp16502_suspend_noirq, 504 mcp16502_resume_noirq) 505 }; 506 #endif 507 static const struct i2c_device_id mcp16502_i2c_id[] = { 508 { "mcp16502", 0 }, 509 { } 510 }; 511 MODULE_DEVICE_TABLE(i2c, mcp16502_i2c_id); 512 513 static struct i2c_driver mcp16502_drv = { 514 .probe = mcp16502_probe, 515 .driver = { 516 .name = "mcp16502-regulator", 517 .of_match_table = of_match_ptr(mcp16502_ids), 518 #ifdef CONFIG_PM 519 .pm = &mcp16502_pm_ops, 520 #endif 521 }, 522 .id_table = mcp16502_i2c_id, 523 }; 524 525 module_i2c_driver(mcp16502_drv); 526 527 MODULE_LICENSE("GPL v2"); 528 MODULE_DESCRIPTION("MCP16502 PMIC driver"); 529 MODULE_AUTHOR("Andrei Stefanescu andrei.stefanescu@microchip.com"); 530