tps65090-regulator.c 14.8 KB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533
/*
 * Regulator driver for tps65090 power management chip.
 *
 * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.

 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.

 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.

 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 */

#include <linux/module.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/gpio.h>
#include <linux/of_gpio.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>
#include <linux/mfd/tps65090.h>

#define MAX_CTRL_READ_TRIES	5
#define MAX_FET_ENABLE_TRIES	1000

#define CTRL_EN_BIT		0 /* Regulator enable bit, active high */
#define CTRL_WT_BIT		2 /* Regulator wait time 0 bit */
#define CTRL_PG_BIT		4 /* Regulator power good bit, 1=good */
#define CTRL_TO_BIT		7 /* Regulator timeout bit, 1=wait */

#define MAX_OVERCURRENT_WAIT	3 /* Overcurrent wait must be <= this */

/**
 * struct tps65090_regulator - Per-regulator data for a tps65090 regulator
 *
 * @dev: Pointer to our device.
 * @desc: The struct regulator_desc for the regulator.
 * @rdev: The struct regulator_dev for the regulator.
 * @overcurrent_wait_valid: True if overcurrent_wait is valid.
 * @overcurrent_wait: For FETs, the value to put in the WTFET bitfield.
 */

struct tps65090_regulator {
	struct device		*dev;
	struct regulator_desc	*desc;
	struct regulator_dev	*rdev;
	bool			overcurrent_wait_valid;
	int			overcurrent_wait;
};

static struct regulator_ops tps65090_ext_control_ops = {
};

/**
 * tps65090_reg_set_overcurrent_wait - Setup overcurrent wait
 *
 * This will set the overcurrent wait time based on what's in the regulator
 * info.
 *
 * @ri:		Overall regulator data
 * @rdev:	Regulator device
 *
 * Return: 0 if no error, non-zero if there was an error writing the register.
 */
static int tps65090_reg_set_overcurrent_wait(struct tps65090_regulator *ri,
					     struct regulator_dev *rdev)
{
	int ret;

	ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
				 MAX_OVERCURRENT_WAIT << CTRL_WT_BIT,
				 ri->overcurrent_wait << CTRL_WT_BIT);
	if (ret) {
		dev_err(&rdev->dev, "Error updating overcurrent wait %#x\n",
			rdev->desc->enable_reg);
	}

	return ret;
}

/**
 * tps65090_try_enable_fet - Try to enable a FET
 *
 * @rdev:	Regulator device
 *
 * Return: 0 if ok, -ENOTRECOVERABLE if the FET power good bit did not get
 * set, or some other -ve value if another error occurred (e.g. i2c error)
 */
static int tps65090_try_enable_fet(struct regulator_dev *rdev)
{
	unsigned int control;
	int ret, i;

	ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
				 rdev->desc->enable_mask,
				 rdev->desc->enable_mask);
	if (ret < 0) {
		dev_err(&rdev->dev, "Error in updating reg %#x\n",
			rdev->desc->enable_reg);
		return ret;
	}

	for (i = 0; i < MAX_CTRL_READ_TRIES; i++) {
		ret = regmap_read(rdev->regmap, rdev->desc->enable_reg,
				  &control);
		if (ret < 0)
			return ret;

		if (!(control & BIT(CTRL_TO_BIT)))
			break;

		usleep_range(1000, 1500);
	}
	if (!(control & BIT(CTRL_PG_BIT)))
		return -ENOTRECOVERABLE;

	return 0;
}

/**
 * tps65090_fet_enable - Enable a FET, trying a few times if it fails
 *
 * Some versions of the tps65090 have issues when turning on the FETs.
 * This function goes through several steps to ensure the best chance of the
 * FET going on.  Specifically:
 * - We'll make sure that we bump the "overcurrent wait" to the maximum, which
 *   increases the chances that we'll turn on properly.
 * - We'll retry turning the FET on multiple times (turning off in between).
 *
 * @rdev:	Regulator device
 *
 * Return: 0 if ok, non-zero if it fails.
 */
static int tps65090_fet_enable(struct regulator_dev *rdev)
{
	int ret, tries;

	/*
	 * Try enabling multiple times until we succeed since sometimes the
	 * first try times out.
	 */
	tries = 0;
	while (true) {
		ret = tps65090_try_enable_fet(rdev);
		if (!ret)
			break;
		if (ret != -ENOTRECOVERABLE || tries == MAX_FET_ENABLE_TRIES)
			goto err;

		/* Try turning the FET off (and then on again) */
		ret = regmap_update_bits(rdev->regmap, rdev->desc->enable_reg,
					 rdev->desc->enable_mask, 0);
		if (ret)
			goto err;

		tries++;
	}

	if (tries)
		dev_warn(&rdev->dev, "reg %#x enable ok after %d tries\n",
			 rdev->desc->enable_reg, tries);

	return 0;
err:
	dev_warn(&rdev->dev, "reg %#x enable failed\n", rdev->desc->enable_reg);
	WARN_ON(1);

	return ret;
}

static struct regulator_ops tps65090_reg_control_ops = {
	.enable		= regulator_enable_regmap,
	.disable	= regulator_disable_regmap,
	.is_enabled	= regulator_is_enabled_regmap,
};

static struct regulator_ops tps65090_fet_control_ops = {
	.enable		= tps65090_fet_enable,
	.disable	= regulator_disable_regmap,
	.is_enabled	= regulator_is_enabled_regmap,
};

static struct regulator_ops tps65090_ldo_ops = {
};

#define tps65090_REG_DESC(_id, _sname, _en_reg, _en_bits, _nvolt, _volt, _ops) \
{							\
	.name = "TPS65090_RAILS"#_id,			\
	.supply_name = _sname,				\
	.id = TPS65090_REGULATOR_##_id,			\
	.n_voltages = _nvolt,				\
	.ops = &_ops,					\
	.fixed_uV = _volt,				\
	.enable_reg = _en_reg,				\
	.enable_val = _en_bits,				\
	.enable_mask = _en_bits,			\
	.type = REGULATOR_VOLTAGE,			\
	.owner = THIS_MODULE,				\
}

#define tps65090_REG_FIXEDV(_id, _sname, en_reg, _en_bits, _volt, _ops) \
	tps65090_REG_DESC(_id, _sname, en_reg, _en_bits, 1, _volt, _ops)

#define tps65090_REG_SWITCH(_id, _sname, en_reg, _en_bits, _ops) \
	tps65090_REG_DESC(_id, _sname, en_reg, _en_bits, 0, 0, _ops)

static struct regulator_desc tps65090_regulator_desc[] = {
	tps65090_REG_FIXEDV(DCDC1, "vsys1",   0x0C, BIT(CTRL_EN_BIT), 5000000,
			    tps65090_reg_control_ops),
	tps65090_REG_FIXEDV(DCDC2, "vsys2",   0x0D, BIT(CTRL_EN_BIT), 3300000,
			    tps65090_reg_control_ops),
	tps65090_REG_SWITCH(DCDC3, "vsys3",   0x0E, BIT(CTRL_EN_BIT),
			    tps65090_reg_control_ops),

	tps65090_REG_SWITCH(FET1,  "infet1",  0x0F,
			    BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT),
			    tps65090_fet_control_ops),
	tps65090_REG_SWITCH(FET2,  "infet2",  0x10,
			    BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT),
			    tps65090_fet_control_ops),
	tps65090_REG_SWITCH(FET3,  "infet3",  0x11,
			    BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT),
			    tps65090_fet_control_ops),
	tps65090_REG_SWITCH(FET4,  "infet4",  0x12,
			    BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT),
			    tps65090_fet_control_ops),
	tps65090_REG_SWITCH(FET5,  "infet5",  0x13,
			    BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT),
			    tps65090_fet_control_ops),
	tps65090_REG_SWITCH(FET6,  "infet6",  0x14,
			    BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT),
			    tps65090_fet_control_ops),
	tps65090_REG_SWITCH(FET7,  "infet7",  0x15,
			    BIT(CTRL_EN_BIT) | BIT(CTRL_PG_BIT),
			    tps65090_fet_control_ops),

	tps65090_REG_FIXEDV(LDO1,  "vsys-l1", 0, 0, 5000000,
			    tps65090_ldo_ops),
	tps65090_REG_FIXEDV(LDO2,  "vsys-l2", 0, 0, 3300000,
			    tps65090_ldo_ops),
};

static inline bool is_dcdc(int id)
{
	switch (id) {
	case TPS65090_REGULATOR_DCDC1:
	case TPS65090_REGULATOR_DCDC2:
	case TPS65090_REGULATOR_DCDC3:
		return true;
	default:
		return false;
	}
}

static int tps65090_config_ext_control(
	struct tps65090_regulator *ri, bool enable)
{
	int ret;
	struct device *parent = ri->dev->parent;
	unsigned int reg_en_reg = ri->desc->enable_reg;

	if (enable)
		ret = tps65090_set_bits(parent, reg_en_reg, 1);
	else
		ret =  tps65090_clr_bits(parent, reg_en_reg, 1);
	if (ret < 0)
		dev_err(ri->dev, "Error in updating reg 0x%x\n", reg_en_reg);
	return ret;
}

static int tps65090_regulator_disable_ext_control(
		struct tps65090_regulator *ri,
		struct tps65090_regulator_plat_data *tps_pdata)
{
	int ret = 0;
	struct device *parent = ri->dev->parent;
	unsigned int reg_en_reg = ri->desc->enable_reg;

	/*
	 * First enable output for internal control if require.
	 * And then disable external control.
	 */
	if (tps_pdata->reg_init_data->constraints.always_on ||
			tps_pdata->reg_init_data->constraints.boot_on) {
		ret =  tps65090_set_bits(parent, reg_en_reg, 0);
		if (ret < 0) {
			dev_err(ri->dev, "Error in set reg 0x%x\n", reg_en_reg);
			return ret;
		}
	}
	return tps65090_config_ext_control(ri, false);
}

static void tps65090_configure_regulator_config(
		struct tps65090_regulator_plat_data *tps_pdata,
		struct regulator_config *config)
{
	if (gpio_is_valid(tps_pdata->gpio)) {
		int gpio_flag = GPIOF_OUT_INIT_LOW;

		if (tps_pdata->reg_init_data->constraints.always_on ||
				tps_pdata->reg_init_data->constraints.boot_on)
			gpio_flag = GPIOF_OUT_INIT_HIGH;

		config->ena_gpio = tps_pdata->gpio;
		config->ena_gpio_initialized = true;
		config->ena_gpio_flags = gpio_flag;
	} else {
		config->ena_gpio = -EINVAL;
		config->ena_gpio_initialized = false;
	}
}

#ifdef CONFIG_OF
static struct of_regulator_match tps65090_matches[] = {
	{ .name = "dcdc1", },
	{ .name = "dcdc2", },
	{ .name = "dcdc3", },
	{ .name = "fet1",  },
	{ .name = "fet2",  },
	{ .name = "fet3",  },
	{ .name = "fet4",  },
	{ .name = "fet5",  },
	{ .name = "fet6",  },
	{ .name = "fet7",  },
	{ .name = "ldo1",  },
	{ .name = "ldo2",  },
};

static struct tps65090_platform_data *tps65090_parse_dt_reg_data(
		struct platform_device *pdev,
		struct of_regulator_match **tps65090_reg_matches)
{
	struct tps65090_platform_data *tps65090_pdata;
	struct device_node *np = pdev->dev.parent->of_node;
	struct device_node *regulators;
	int idx = 0, ret;
	struct tps65090_regulator_plat_data *reg_pdata;

	tps65090_pdata = devm_kzalloc(&pdev->dev, sizeof(*tps65090_pdata),
				GFP_KERNEL);
	if (!tps65090_pdata)
		return ERR_PTR(-ENOMEM);

	reg_pdata = devm_kzalloc(&pdev->dev, TPS65090_REGULATOR_MAX *
				sizeof(*reg_pdata), GFP_KERNEL);
	if (!reg_pdata)
		return ERR_PTR(-ENOMEM);

	regulators = of_get_child_by_name(np, "regulators");
	if (!regulators) {
		dev_err(&pdev->dev, "regulator node not found\n");
		return ERR_PTR(-ENODEV);
	}

	ret = of_regulator_match(&pdev->dev, regulators, tps65090_matches,
			ARRAY_SIZE(tps65090_matches));
	of_node_put(regulators);
	if (ret < 0) {
		dev_err(&pdev->dev,
			"Error parsing regulator init data: %d\n", ret);
		return ERR_PTR(ret);
	}

	*tps65090_reg_matches = tps65090_matches;
	for (idx = 0; idx < ARRAY_SIZE(tps65090_matches); idx++) {
		struct regulator_init_data *ri_data;
		struct tps65090_regulator_plat_data *rpdata;

		rpdata = &reg_pdata[idx];
		ri_data = tps65090_matches[idx].init_data;
		if (!ri_data || !tps65090_matches[idx].of_node)
			continue;

		rpdata->reg_init_data = ri_data;
		rpdata->enable_ext_control = of_property_read_bool(
					tps65090_matches[idx].of_node,
					"ti,enable-ext-control");
		if (rpdata->enable_ext_control)
			rpdata->gpio = of_get_named_gpio(np,
					"dcdc-ext-control-gpios", 0);

		if (of_property_read_u32(tps65090_matches[idx].of_node,
					 "ti,overcurrent-wait",
					 &rpdata->overcurrent_wait) == 0)
			rpdata->overcurrent_wait_valid = true;

		tps65090_pdata->reg_pdata[idx] = rpdata;
	}
	return tps65090_pdata;
}
#else
static inline struct tps65090_platform_data *tps65090_parse_dt_reg_data(
			struct platform_device *pdev,
			struct of_regulator_match **tps65090_reg_matches)
{
	*tps65090_reg_matches = NULL;
	return NULL;
}
#endif

static int tps65090_regulator_probe(struct platform_device *pdev)
{
	struct tps65090 *tps65090_mfd = dev_get_drvdata(pdev->dev.parent);
	struct tps65090_regulator *ri = NULL;
	struct regulator_config config = { };
	struct regulator_dev *rdev;
	struct tps65090_regulator_plat_data *tps_pdata;
	struct tps65090_regulator *pmic;
	struct tps65090_platform_data *tps65090_pdata;
	struct of_regulator_match *tps65090_reg_matches = NULL;
	int num;
	int ret;

	dev_dbg(&pdev->dev, "Probing regulator\n");

	tps65090_pdata = dev_get_platdata(pdev->dev.parent);
	if (!tps65090_pdata && tps65090_mfd->dev->of_node)
		tps65090_pdata = tps65090_parse_dt_reg_data(pdev,
					&tps65090_reg_matches);
	if (IS_ERR_OR_NULL(tps65090_pdata)) {
		dev_err(&pdev->dev, "Platform data missing\n");
		return tps65090_pdata ? PTR_ERR(tps65090_pdata) : -EINVAL;
	}

	pmic = devm_kzalloc(&pdev->dev, TPS65090_REGULATOR_MAX * sizeof(*pmic),
			GFP_KERNEL);
	if (!pmic)
		return -ENOMEM;

	for (num = 0; num < TPS65090_REGULATOR_MAX; num++) {
		tps_pdata = tps65090_pdata->reg_pdata[num];

		ri = &pmic[num];
		ri->dev = &pdev->dev;
		ri->desc = &tps65090_regulator_desc[num];
		if (tps_pdata) {
			ri->overcurrent_wait_valid =
				tps_pdata->overcurrent_wait_valid;
			ri->overcurrent_wait = tps_pdata->overcurrent_wait;
		}

		/*
		 * TPS5090 DCDC support the control from external digital input.
		 * Configure it as per platform data.
		 */
		if (tps_pdata && is_dcdc(num) && tps_pdata->reg_init_data) {
			if (tps_pdata->enable_ext_control) {
				tps65090_configure_regulator_config(
						tps_pdata, &config);
				ri->desc->ops = &tps65090_ext_control_ops;
			} else {
				ret = tps65090_regulator_disable_ext_control(
						ri, tps_pdata);
				if (ret < 0) {
					dev_err(&pdev->dev,
						"failed disable ext control\n");
					return ret;
				}
			}
		}

		config.dev = pdev->dev.parent;
		config.driver_data = ri;
		config.regmap = tps65090_mfd->rmap;
		if (tps_pdata)
			config.init_data = tps_pdata->reg_init_data;
		else
			config.init_data = NULL;
		if (tps65090_reg_matches)
			config.of_node = tps65090_reg_matches[num].of_node;
		else
			config.of_node = NULL;

		rdev = devm_regulator_register(&pdev->dev, ri->desc, &config);
		if (IS_ERR(rdev)) {
			dev_err(&pdev->dev, "failed to register regulator %s\n",
				ri->desc->name);
			return PTR_ERR(rdev);
		}
		ri->rdev = rdev;

		if (ri->overcurrent_wait_valid) {
			ret = tps65090_reg_set_overcurrent_wait(ri, rdev);
			if (ret < 0)
				return ret;
		}

		/* Enable external control if it is require */
		if (tps_pdata && is_dcdc(num) && tps_pdata->reg_init_data &&
				tps_pdata->enable_ext_control) {
			ret = tps65090_config_ext_control(ri, true);
			if (ret < 0)
				return ret;
		}
	}

	platform_set_drvdata(pdev, pmic);
	return 0;
}

static struct platform_driver tps65090_regulator_driver = {
	.driver	= {
		.name	= "tps65090-pmic",
	},
	.probe		= tps65090_regulator_probe,
};

static int __init tps65090_regulator_init(void)
{
	return platform_driver_register(&tps65090_regulator_driver);
}
subsys_initcall(tps65090_regulator_init);

static void __exit tps65090_regulator_exit(void)
{
	platform_driver_unregister(&tps65090_regulator_driver);
}
module_exit(tps65090_regulator_exit);

MODULE_DESCRIPTION("tps65090 regulator driver");
MODULE_AUTHOR("Venu Byravarasu <vbyravarasu@nvidia.com>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:tps65090-pmic");