ti-abb-regulator.c 23.5 KB
Newer Older
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
/*
 * Texas Instruments SoC Adaptive Body Bias(ABB) Regulator
 *
 * Copyright (C) 2011 Texas Instruments, Inc.
 * Mike Turquette <mturquette@ti.com>
 *
 * Copyright (C) 2012-2013 Texas Instruments, Inc.
 * Andrii Tseglytskyi <andrii.tseglytskyi@ti.com>
 * Nishanth Menon <nm@ti.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
 * kind, whether express or implied; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/of_regulator.h>

/*
 * ABB LDO operating states:
 * NOMINAL_OPP:	bypasses the ABB LDO
 * FAST_OPP:	sets ABB LDO to Forward Body-Bias
 * SLOW_OPP:	sets ABB LDO to Reverse Body-Bias
 */
#define TI_ABB_NOMINAL_OPP	0
#define TI_ABB_FAST_OPP		1
#define TI_ABB_SLOW_OPP		3

/**
 * struct ti_abb_info - ABB information per voltage setting
 * @opp_sel:	one of TI_ABB macro
 * @vset:	(optional) vset value that LDOVBB needs to be overriden with.
 *
 * Array of per voltage entries organized in the same order as regulator_desc's
 * volt_table list. (selector is used to index from this array)
 */
struct ti_abb_info {
	u32 opp_sel;
	u32 vset;
};

/**
 * struct ti_abb_reg - Register description for ABB block
 * @setup_reg:			setup register offset from base
 * @control_reg:		control register offset from base
 * @sr2_wtcnt_value_mask:	setup register- sr2_wtcnt_value mask
 * @fbb_sel_mask:		setup register- FBB sel mask
 * @rbb_sel_mask:		setup register- RBB sel mask
 * @sr2_en_mask:		setup register- enable mask
 * @opp_change_mask:		control register - mask to trigger LDOVBB change
 * @opp_sel_mask:		control register - mask for mode to operate
 */
struct ti_abb_reg {
	u32 setup_reg;
	u32 control_reg;

	/* Setup register fields */
	u32 sr2_wtcnt_value_mask;
	u32 fbb_sel_mask;
	u32 rbb_sel_mask;
	u32 sr2_en_mask;

	/* Control register fields */
	u32 opp_change_mask;
	u32 opp_sel_mask;
};

/**
 * struct ti_abb - ABB instance data
 * @rdesc:			regulator descriptor
 * @clk:			clock(usually sysclk) supplying ABB block
 * @base:			base address of ABB block
 * @int_base:			interrupt register base address
 * @efuse_base:			(optional) efuse base address for ABB modes
 * @ldo_base:			(optional) LDOVBB vset override base address
 * @regs:			pointer to struct ti_abb_reg for ABB block
 * @txdone_mask:		mask on int_base for tranxdone interrupt
 * @ldovbb_override_mask:	mask to ldo_base for overriding default LDO VBB
 *				vset with value from efuse
 * @ldovbb_vset_mask:		mask to ldo_base for providing the VSET override
 * @info:			array to per voltage ABB configuration
 * @current_info_idx:		current index to info
 * @settling_time:		SoC specific settling time for LDO VBB
 */
struct ti_abb {
	struct regulator_desc rdesc;
	struct clk *clk;
	void __iomem *base;
	void __iomem *int_base;
	void __iomem *efuse_base;
	void __iomem *ldo_base;

	const struct ti_abb_reg *regs;
	u32 txdone_mask;
	u32 ldovbb_override_mask;
	u32 ldovbb_vset_mask;

	struct ti_abb_info *info;
	int current_info_idx;

	u32 settling_time;
};

/**
 * ti_abb_rmw() - handy wrapper to set specific register bits
 * @mask:	mask for register field
 * @value:	value shifted to mask location and written
 * @offset:	offset of register
 * @base:	base address
 *
 * Return: final register value (may be unused)
 */
static inline u32 ti_abb_rmw(u32 mask, u32 value, u32 offset,
			     void __iomem *base)
{
	u32 val;

	val = readl(base + offset);
	val &= ~mask;
	val |= (value << __ffs(mask)) & mask;
	writel(val, base + offset);

	return val;
}

/**
 * ti_abb_check_txdone() - handy wrapper to check ABB tranxdone status
 * @abb:	pointer to the abb instance
 *
 * Return: true or false
 */
static inline bool ti_abb_check_txdone(const struct ti_abb *abb)
{
	return !!(readl(abb->int_base) & abb->txdone_mask);
}

/**
 * ti_abb_clear_txdone() - handy wrapper to clear ABB tranxdone status
 * @abb:	pointer to the abb instance
 */
static inline void ti_abb_clear_txdone(const struct ti_abb *abb)
{
	writel(abb->txdone_mask, abb->int_base);
};

/**
 * ti_abb_wait_tranx() - waits for ABB tranxdone event
 * @dev:	device
 * @abb:	pointer to the abb instance
 *
 * Return: 0 on success or -ETIMEDOUT if the event is not cleared on time.
 */
static int ti_abb_wait_txdone(struct device *dev, struct ti_abb *abb)
{
	int timeout = 0;
	bool status;

	while (timeout++ <= abb->settling_time) {
		status = ti_abb_check_txdone(abb);
		if (status)
			break;

		udelay(1);
	}

	if (timeout > abb->settling_time) {
		dev_warn_ratelimited(dev,
				     "%s:TRANXDONE timeout(%duS) int=0x%08x\n",
				     __func__, timeout, readl(abb->int_base));
		return -ETIMEDOUT;
	}

	return 0;
}

/**
 * ti_abb_clear_all_txdone() - clears ABB tranxdone event
 * @dev:	device
 * @abb:	pointer to the abb instance
 *
 * Return: 0 on success or -ETIMEDOUT if the event is not cleared on time.
 */
static int ti_abb_clear_all_txdone(struct device *dev, const struct ti_abb *abb)
{
	int timeout = 0;
	bool status;

	while (timeout++ <= abb->settling_time) {
		ti_abb_clear_txdone(abb);

		status = ti_abb_check_txdone(abb);
		if (!status)
			break;

		udelay(1);
	}

	if (timeout > abb->settling_time) {
		dev_warn_ratelimited(dev,
				     "%s:TRANXDONE timeout(%duS) int=0x%08x\n",
				     __func__, timeout, readl(abb->int_base));
		return -ETIMEDOUT;
	}

	return 0;
}

/**
 * ti_abb_program_ldovbb() - program LDOVBB register for override value
 * @dev:	device
 * @abb:	pointer to the abb instance
 * @info:	ABB info to program
 */
static void ti_abb_program_ldovbb(struct device *dev, const struct ti_abb *abb,
				  struct ti_abb_info *info)
{
	u32 val;

	val = readl(abb->ldo_base);
	/* clear up previous values */
	val &= ~(abb->ldovbb_override_mask | abb->ldovbb_vset_mask);

	switch (info->opp_sel) {
	case TI_ABB_SLOW_OPP:
	case TI_ABB_FAST_OPP:
		val |= abb->ldovbb_override_mask;
		val |= info->vset << __ffs(abb->ldovbb_vset_mask);
		break;
	}

	writel(val, abb->ldo_base);
}

/**
 * ti_abb_set_opp() - Setup ABB and LDO VBB for required bias
 * @rdev:	regulator device
 * @abb:	pointer to the abb instance
 * @info:	ABB info to program
 *
 * Return: 0 on success or appropriate error value when fails
 */
static int ti_abb_set_opp(struct regulator_dev *rdev, struct ti_abb *abb,
			  struct ti_abb_info *info)
{
	const struct ti_abb_reg *regs = abb->regs;
	struct device *dev = &rdev->dev;
	int ret;

	ret = ti_abb_clear_all_txdone(dev, abb);
	if (ret)
		goto out;

	ti_abb_rmw(regs->fbb_sel_mask | regs->rbb_sel_mask, 0, regs->setup_reg,
		   abb->base);

	switch (info->opp_sel) {
	case TI_ABB_SLOW_OPP:
		ti_abb_rmw(regs->rbb_sel_mask, 1, regs->setup_reg, abb->base);
		break;
	case TI_ABB_FAST_OPP:
		ti_abb_rmw(regs->fbb_sel_mask, 1, regs->setup_reg, abb->base);
		break;
	}

	/* program next state of ABB ldo */
	ti_abb_rmw(regs->opp_sel_mask, info->opp_sel, regs->control_reg,
		   abb->base);

	/* program LDO VBB vset override if needed */
	if (abb->ldo_base)
		ti_abb_program_ldovbb(dev, abb, info);

	/* Initiate ABB ldo change */
	ti_abb_rmw(regs->opp_change_mask, 1, regs->control_reg, abb->base);

	/* Wait for ABB LDO to complete transition to new Bias setting */
	ret = ti_abb_wait_txdone(dev, abb);
	if (ret)
		goto out;

	ret = ti_abb_clear_all_txdone(dev, abb);
	if (ret)
		goto out;

out:
	return ret;
}

/**
 * ti_abb_set_voltage_sel() - regulator accessor function to set ABB LDO
 * @rdev:	regulator device
 * @sel:	selector to index into required ABB LDO settings (maps to
 *		regulator descriptor's volt_table)
 *
 * Return: 0 on success or appropriate error value when fails
 */
static int ti_abb_set_voltage_sel(struct regulator_dev *rdev, unsigned sel)
{
	const struct regulator_desc *desc = rdev->desc;
	struct ti_abb *abb = rdev_get_drvdata(rdev);
	struct device *dev = &rdev->dev;
	struct ti_abb_info *info, *oinfo;
	int ret = 0;

	if (!abb) {
		dev_err_ratelimited(dev, "%s: No regulator drvdata\n",
				    __func__);
		return -ENODEV;
	}

	if (!desc->n_voltages || !abb->info) {
		dev_err_ratelimited(dev,
				    "%s: No valid voltage table entries?\n",
				    __func__);
		return -EINVAL;
	}

	if (sel >= desc->n_voltages) {
		dev_err(dev, "%s: sel idx(%d) >= n_voltages(%d)\n", __func__,
			sel, desc->n_voltages);
		return -EINVAL;
	}

	/* If we are in the same index as we were, nothing to do here! */
	if (sel == abb->current_info_idx) {
		dev_dbg(dev, "%s: Already at sel=%d\n", __func__, sel);
		return ret;
	}

	/* If data is exactly the same, then just update index, no change */
	info = &abb->info[sel];
	oinfo = &abb->info[abb->current_info_idx];
	if (!memcmp(info, oinfo, sizeof(*info))) {
		dev_dbg(dev, "%s: Same data new idx=%d, old idx=%d\n", __func__,
			sel, abb->current_info_idx);
		goto out;
	}

	ret = ti_abb_set_opp(rdev, abb, info);

out:
	if (!ret)
		abb->current_info_idx = sel;
	else
		dev_err_ratelimited(dev,
				    "%s: Volt[%d] idx[%d] mode[%d] Fail(%d)\n",
				    __func__, desc->volt_table[sel], sel,
				    info->opp_sel, ret);
	return ret;
}

/**
 * ti_abb_get_voltage_sel() - Regulator accessor to get current ABB LDO setting
 * @rdev:	regulator device
 *
 * Return: 0 on success or appropriate error value when fails
 */
static int ti_abb_get_voltage_sel(struct regulator_dev *rdev)
{
	const struct regulator_desc *desc = rdev->desc;
	struct ti_abb *abb = rdev_get_drvdata(rdev);
	struct device *dev = &rdev->dev;

	if (!abb) {
		dev_err_ratelimited(dev, "%s: No regulator drvdata\n",
				    __func__);
		return -ENODEV;
	}

	if (!desc->n_voltages || !abb->info) {
		dev_err_ratelimited(dev,
				    "%s: No valid voltage table entries?\n",
				    __func__);
		return -EINVAL;
	}

390 391
	if (abb->current_info_idx >= (int)desc->n_voltages) {
		dev_err(dev, "%s: Corrupted data? idx(%d) >= n_voltages(%d)\n",
392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724
			__func__, abb->current_info_idx, desc->n_voltages);
		return -EINVAL;
	}

	return abb->current_info_idx;
}

/**
 * ti_abb_init_timings() - setup ABB clock timing for the current platform
 * @dev:	device
 * @abb:	pointer to the abb instance
 *
 * Return: 0 if timing is updated, else returns error result.
 */
static int ti_abb_init_timings(struct device *dev, struct ti_abb *abb)
{
	u32 clock_cycles;
	u32 clk_rate, sr2_wt_cnt_val, cycle_rate;
	const struct ti_abb_reg *regs = abb->regs;
	int ret;
	char *pname = "ti,settling-time";

	/* read device tree properties */
	ret = of_property_read_u32(dev->of_node, pname, &abb->settling_time);
	if (ret) {
		dev_err(dev, "Unable to get property '%s'(%d)\n", pname, ret);
		return ret;
	}

	/* ABB LDO cannot be settle in 0 time */
	if (!abb->settling_time) {
		dev_err(dev, "Invalid property:'%s' set as 0!\n", pname);
		return -EINVAL;
	}

	pname = "ti,clock-cycles";
	ret = of_property_read_u32(dev->of_node, pname, &clock_cycles);
	if (ret) {
		dev_err(dev, "Unable to get property '%s'(%d)\n", pname, ret);
		return ret;
	}
	/* ABB LDO cannot be settle in 0 clock cycles */
	if (!clock_cycles) {
		dev_err(dev, "Invalid property:'%s' set as 0!\n", pname);
		return -EINVAL;
	}

	abb->clk = devm_clk_get(dev, NULL);
	if (IS_ERR(abb->clk)) {
		ret = PTR_ERR(abb->clk);
		dev_err(dev, "%s: Unable to get clk(%d)\n", __func__, ret);
		return ret;
	}

	/*
	 * SR2_WTCNT_VALUE is the settling time for the ABB ldo after a
	 * transition and must be programmed with the correct time at boot.
	 * The value programmed into the register is the number of SYS_CLK
	 * clock cycles that match a given wall time profiled for the ldo.
	 * This value depends on:
	 * settling time of ldo in micro-seconds (varies per OMAP family)
	 * # of clock cycles per SYS_CLK period (varies per OMAP family)
	 * the SYS_CLK frequency in MHz (varies per board)
	 * The formula is:
	 *
	 *                      ldo settling time (in micro-seconds)
	 * SR2_WTCNT_VALUE = ------------------------------------------
	 *                   (# system clock cycles) * (sys_clk period)
	 *
	 * Put another way:
	 *
	 * SR2_WTCNT_VALUE = settling time / (# SYS_CLK cycles / SYS_CLK rate))
	 *
	 * To avoid dividing by zero multiply both "# clock cycles" and
	 * "settling time" by 10 such that the final result is the one we want.
	 */

	/* Convert SYS_CLK rate to MHz & prevent divide by zero */
	clk_rate = DIV_ROUND_CLOSEST(clk_get_rate(abb->clk), 1000000);

	/* Calculate cycle rate */
	cycle_rate = DIV_ROUND_CLOSEST(clock_cycles * 10, clk_rate);

	/* Calulate SR2_WTCNT_VALUE */
	sr2_wt_cnt_val = DIV_ROUND_CLOSEST(abb->settling_time * 10, cycle_rate);

	dev_dbg(dev, "%s: Clk_rate=%ld, sr2_cnt=0x%08x\n", __func__,
		clk_get_rate(abb->clk), sr2_wt_cnt_val);

	ti_abb_rmw(regs->sr2_wtcnt_value_mask, sr2_wt_cnt_val, regs->setup_reg,
		   abb->base);

	return 0;
}

/**
 * ti_abb_init_table() - Initialize ABB table from device tree
 * @dev:	device
 * @abb:	pointer to the abb instance
 * @rinit_data:	regulator initdata
 *
 * Return: 0 on success or appropriate error value when fails
 */
static int ti_abb_init_table(struct device *dev, struct ti_abb *abb,
			     struct regulator_init_data *rinit_data)
{
	struct ti_abb_info *info;
	const struct property *prop;
	const __be32 *abb_info;
	const u32 num_values = 6;
	char *pname = "ti,abb_info";
	u32 num_entries, i;
	unsigned int *volt_table;
	int min_uV = INT_MAX, max_uV = 0;
	struct regulation_constraints *c = &rinit_data->constraints;

	prop = of_find_property(dev->of_node, pname, NULL);
	if (!prop) {
		dev_err(dev, "No '%s' property?\n", pname);
		return -ENODEV;
	}

	if (!prop->value) {
		dev_err(dev, "Empty '%s' property?\n", pname);
		return -ENODATA;
	}

	/*
	 * Each abb_info is a set of n-tuple, where n is num_values, consisting
	 * of voltage and a set of detection logic for ABB information for that
	 * voltage to apply.
	 */
	num_entries = prop->length / sizeof(u32);
	if (!num_entries || (num_entries % num_values)) {
		dev_err(dev, "All '%s' list entries need %d vals\n", pname,
			num_values);
		return -EINVAL;
	}
	num_entries /= num_values;

	info = devm_kzalloc(dev, sizeof(*info) * num_entries, GFP_KERNEL);
	if (!info) {
		dev_err(dev, "Can't allocate info table for '%s' property\n",
			pname);
		return -ENOMEM;
	}
	abb->info = info;

	volt_table = devm_kzalloc(dev, sizeof(unsigned int) * num_entries,
				  GFP_KERNEL);
	if (!volt_table) {
		dev_err(dev, "Can't allocate voltage table for '%s' property\n",
			pname);
		return -ENOMEM;
	}

	abb->rdesc.n_voltages = num_entries;
	abb->rdesc.volt_table = volt_table;
	/* We do not know where the OPP voltage is at the moment */
	abb->current_info_idx = -EINVAL;

	abb_info = prop->value;
	for (i = 0; i < num_entries; i++, info++, volt_table++) {
		u32 efuse_offset, rbb_mask, fbb_mask, vset_mask;
		u32 efuse_val;

		/* NOTE: num_values should equal to entries picked up here */
		*volt_table = be32_to_cpup(abb_info++);
		info->opp_sel = be32_to_cpup(abb_info++);
		efuse_offset = be32_to_cpup(abb_info++);
		rbb_mask = be32_to_cpup(abb_info++);
		fbb_mask = be32_to_cpup(abb_info++);
		vset_mask = be32_to_cpup(abb_info++);

		dev_dbg(dev,
			"[%d]v=%d ABB=%d ef=0x%x rbb=0x%x fbb=0x%x vset=0x%x\n",
			i, *volt_table, info->opp_sel, efuse_offset, rbb_mask,
			fbb_mask, vset_mask);

		/* Find min/max for voltage set */
		if (min_uV > *volt_table)
			min_uV = *volt_table;
		if (max_uV < *volt_table)
			max_uV = *volt_table;

		if (!abb->efuse_base) {
			/* Ignore invalid data, but warn to help cleanup */
			if (efuse_offset || rbb_mask || fbb_mask || vset_mask)
				dev_err(dev, "prop '%s': v=%d,bad efuse/mask\n",
					pname, *volt_table);
			goto check_abb;
		}

		efuse_val = readl(abb->efuse_base + efuse_offset);

		/* Use ABB recommendation from Efuse */
		if (efuse_val & rbb_mask)
			info->opp_sel = TI_ABB_SLOW_OPP;
		else if (efuse_val & fbb_mask)
			info->opp_sel = TI_ABB_FAST_OPP;
		else if (rbb_mask || fbb_mask)
			info->opp_sel = TI_ABB_NOMINAL_OPP;

		dev_dbg(dev,
			"[%d]v=%d efusev=0x%x final ABB=%d\n",
			i, *volt_table, efuse_val, info->opp_sel);

		/* Use recommended Vset bits from Efuse */
		if (!abb->ldo_base) {
			if (vset_mask)
				dev_err(dev, "prop'%s':v=%d vst=%x LDO base?\n",
					pname, *volt_table, vset_mask);
			continue;
		}
		info->vset = efuse_val & vset_mask >> __ffs(vset_mask);
		dev_dbg(dev, "[%d]v=%d vset=%x\n", i, *volt_table, info->vset);
check_abb:
		switch (info->opp_sel) {
		case TI_ABB_NOMINAL_OPP:
		case TI_ABB_FAST_OPP:
		case TI_ABB_SLOW_OPP:
			/* Valid values */
			break;
		default:
			dev_err(dev, "%s:[%d]v=%d, ABB=%d is invalid! Abort!\n",
				__func__, i, *volt_table, info->opp_sel);
			return -EINVAL;
		}
	}

	/* Setup the min/max voltage constraints from the supported list */
	c->min_uV = min_uV;
	c->max_uV = max_uV;

	return 0;
}

static struct regulator_ops ti_abb_reg_ops = {
	.list_voltage = regulator_list_voltage_table,

	.set_voltage_sel = ti_abb_set_voltage_sel,
	.get_voltage_sel = ti_abb_get_voltage_sel,
};

/* Default ABB block offsets, IF this changes in future, create new one */
static const struct ti_abb_reg abb_regs_v1 = {
	/* WARNING: registers are wrongly documented in TRM */
	.setup_reg		= 0x04,
	.control_reg		= 0x00,

	.sr2_wtcnt_value_mask	= (0xff << 8),
	.fbb_sel_mask		= (0x01 << 2),
	.rbb_sel_mask		= (0x01 << 1),
	.sr2_en_mask		= (0x01 << 0),

	.opp_change_mask	= (0x01 << 2),
	.opp_sel_mask		= (0x03 << 0),
};

static const struct ti_abb_reg abb_regs_v2 = {
	.setup_reg		= 0x00,
	.control_reg		= 0x04,

	.sr2_wtcnt_value_mask	= (0xff << 8),
	.fbb_sel_mask		= (0x01 << 2),
	.rbb_sel_mask		= (0x01 << 1),
	.sr2_en_mask		= (0x01 << 0),

	.opp_change_mask	= (0x01 << 2),
	.opp_sel_mask		= (0x03 << 0),
};

static const struct of_device_id ti_abb_of_match[] = {
	{.compatible = "ti,abb-v1", .data = &abb_regs_v1},
	{.compatible = "ti,abb-v2", .data = &abb_regs_v2},
	{ },
};

MODULE_DEVICE_TABLE(of, ti_abb_of_match);

/**
 * ti_abb_probe() - Initialize an ABB ldo instance
 * @pdev: ABB platform device
 *
 * Initializes an individual ABB LDO for required Body-Bias. ABB is used to
 * addional bias supply to SoC modules for power savings or mandatory stability
 * configuration at certain Operating Performance Points(OPPs).
 *
 * Return: 0 on success or appropriate error value when fails
 */
static int ti_abb_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	const struct of_device_id *match;
	struct resource *res;
	struct ti_abb *abb;
	struct regulator_init_data *initdata = NULL;
	struct regulator_dev *rdev = NULL;
	struct regulator_desc *desc;
	struct regulation_constraints *c;
	struct regulator_config config = { };
	char *pname;
	int ret = 0;

	match = of_match_device(ti_abb_of_match, dev);
	if (!match) {
		/* We do not expect this to happen */
		ret = -ENODEV;
		dev_err(dev, "%s: Unable to match device\n", __func__);
		goto err;
	}
	if (!match->data) {
		ret = -EINVAL;
		dev_err(dev, "%s: Bad data in match\n", __func__);
		goto err;
	}

	abb = devm_kzalloc(dev, sizeof(struct ti_abb), GFP_KERNEL);
	if (!abb) {
		dev_err(dev, "%s: Unable to allocate ABB struct\n", __func__);
		ret = -ENOMEM;
		goto err;
	}
	abb->regs = match->data;

	/* Map ABB resources */
	pname = "base-address";
	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, pname);
	if (!res) {
		dev_err(dev, "Missing '%s' IO resource\n", pname);
		ret = -ENODEV;
		goto err;
	}
725 726 727
	abb->base = devm_ioremap_resource(dev, res);
	if (IS_ERR(abb->base)) {
		ret = PTR_ERR(abb->base);
728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777
		goto err;
	}

	pname = "int-address";
	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, pname);
	if (!res) {
		dev_err(dev, "Missing '%s' IO resource\n", pname);
		ret = -ENODEV;
		goto err;
	}
	/*
	 * We may have shared interrupt register offsets which are
	 * write-1-to-clear between domains ensuring exclusivity.
	 */
	abb->int_base = devm_ioremap_nocache(dev, res->start,
					     resource_size(res));
	if (!abb->int_base) {
		dev_err(dev, "Unable to map '%s'\n", pname);
		ret = -ENOMEM;
		goto err;
	}

	/* Map Optional resources */
	pname = "efuse-address";
	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, pname);
	if (!res) {
		dev_dbg(dev, "Missing '%s' IO resource\n", pname);
		ret = -ENODEV;
		goto skip_opt;
	}

	/*
	 * We may have shared efuse register offsets which are read-only
	 * between domains
	 */
	abb->efuse_base = devm_ioremap_nocache(dev, res->start,
					       resource_size(res));
	if (!abb->efuse_base) {
		dev_err(dev, "Unable to map '%s'\n", pname);
		ret = -ENOMEM;
		goto err;
	}

	pname = "ldo-address";
	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, pname);
	if (!res) {
		dev_dbg(dev, "Missing '%s' IO resource\n", pname);
		ret = -ENODEV;
		goto skip_opt;
	}
778 779 780
	abb->ldo_base = devm_ioremap_resource(dev, res);
	if (IS_ERR(abb->ldo_base)) {
		ret = PTR_ERR(abb->ldo_base);
781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910
		goto err;
	}

	/* IF ldo_base is set, the following are mandatory */
	pname = "ti,ldovbb-override-mask";
	ret =
	    of_property_read_u32(pdev->dev.of_node, pname,
				 &abb->ldovbb_override_mask);
	if (ret) {
		dev_err(dev, "Missing '%s' (%d)\n", pname, ret);
		goto err;
	}
	if (!abb->ldovbb_override_mask) {
		dev_err(dev, "Invalid property:'%s' set as 0!\n", pname);
		ret = -EINVAL;
		goto err;
	}

	pname = "ti,ldovbb-vset-mask";
	ret =
	    of_property_read_u32(pdev->dev.of_node, pname,
				 &abb->ldovbb_vset_mask);
	if (ret) {
		dev_err(dev, "Missing '%s' (%d)\n", pname, ret);
		goto err;
	}
	if (!abb->ldovbb_vset_mask) {
		dev_err(dev, "Invalid property:'%s' set as 0!\n", pname);
		ret = -EINVAL;
		goto err;
	}

skip_opt:
	pname = "ti,tranxdone-status-mask";
	ret =
	    of_property_read_u32(pdev->dev.of_node, pname,
				 &abb->txdone_mask);
	if (ret) {
		dev_err(dev, "Missing '%s' (%d)\n", pname, ret);
		goto err;
	}
	if (!abb->txdone_mask) {
		dev_err(dev, "Invalid property:'%s' set as 0!\n", pname);
		ret = -EINVAL;
		goto err;
	}

	initdata = of_get_regulator_init_data(dev, pdev->dev.of_node);
	if (!initdata) {
		ret = -ENOMEM;
		dev_err(dev, "%s: Unable to alloc regulator init data\n",
			__func__);
		goto err;
	}

	/* init ABB opp_sel table */
	ret = ti_abb_init_table(dev, abb, initdata);
	if (ret)
		goto err;

	/* init ABB timing */
	ret = ti_abb_init_timings(dev, abb);
	if (ret)
		goto err;

	desc = &abb->rdesc;
	desc->name = dev_name(dev);
	desc->owner = THIS_MODULE;
	desc->type = REGULATOR_VOLTAGE;
	desc->ops = &ti_abb_reg_ops;

	c = &initdata->constraints;
	if (desc->n_voltages > 1)
		c->valid_ops_mask |= REGULATOR_CHANGE_VOLTAGE;
	c->always_on = true;

	config.dev = dev;
	config.init_data = initdata;
	config.driver_data = abb;
	config.of_node = pdev->dev.of_node;

	rdev = regulator_register(desc, &config);
	if (IS_ERR(rdev)) {
		ret = PTR_ERR(rdev);
		dev_err(dev, "%s: failed to register regulator(%d)\n",
			__func__, ret);
		goto err;
	}
	platform_set_drvdata(pdev, rdev);

	/* Enable the ldo if not already done by bootloader */
	ti_abb_rmw(abb->regs->sr2_en_mask, 1, abb->regs->setup_reg, abb->base);

	return 0;

err:
	dev_err(dev, "%s: Failed to initialize(%d)\n", __func__, ret);
	return ret;
}

/**
 * ti_abb_remove() - cleanups
 * @pdev: ABB platform device
 *
 * Return: 0
 */
static int ti_abb_remove(struct platform_device *pdev)
{
	struct regulator_dev *rdev = platform_get_drvdata(pdev);

	regulator_unregister(rdev);
	return 0;
}

MODULE_ALIAS("platform:ti_abb");

static struct platform_driver ti_abb_driver = {
	.probe = ti_abb_probe,
	.remove = ti_abb_remove,
	.driver = {
		   .name = "ti_abb",
		   .owner = THIS_MODULE,
		   .of_match_table = of_match_ptr(ti_abb_of_match),
		   },
};
module_platform_driver(ti_abb_driver);

MODULE_DESCRIPTION("Texas Instruments ABB LDO regulator driver");
MODULE_AUTHOR("Texas Instruments Inc.");
MODULE_LICENSE("GPL v2");