1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 *  linux/drivers/mmc/core/core.c
   4 *
   5 *  Copyright (C) 2003-2004 Russell King, All Rights Reserved.
   6 *  SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
   7 *  Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved.
   8 *  MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved.
   9 */
  10#include <linux/module.h>
  11#include <linux/init.h>
  12#include <linux/interrupt.h>
  13#include <linux/completion.h>
  14#include <linux/device.h>
  15#include <linux/delay.h>
  16#include <linux/pagemap.h>
  17#include <linux/err.h>
  18#include <linux/leds.h>
  19#include <linux/scatterlist.h>
  20#include <linux/log2.h>
  21#include <linux/pm_runtime.h>
  22#include <linux/pm_wakeup.h>
  23#include <linux/suspend.h>
  24#include <linux/fault-inject.h>
  25#include <linux/random.h>
  26#include <linux/slab.h>
  27#include <linux/of.h>
  28
  29#include <linux/mmc/card.h>
  30#include <linux/mmc/host.h>
  31#include <linux/mmc/mmc.h>
  32#include <linux/mmc/sd.h>
  33#include <linux/mmc/slot-gpio.h>
  34
  35#define CREATE_TRACE_POINTS
  36#include <trace/events/mmc.h>
  37
  38#include "core.h"
  39#include "card.h"
  40#include "bus.h"
  41#include "host.h"
  42#include "sdio_bus.h"
  43#include "pwrseq.h"
  44
  45#include "mmc_ops.h"
  46#include "sd_ops.h"
  47#include "sdio_ops.h"
  48
  49/* The max erase timeout, used when host->max_busy_timeout isn't specified */
  50#define MMC_ERASE_TIMEOUT_MS	(60 * 1000) /* 60 s */
  51#define SD_DISCARD_TIMEOUT_MS	(250)
  52
  53static const unsigned freqs[] = { 400000, 300000, 200000, 100000 };
  54
  55/*
  56 * Enabling software CRCs on the data blocks can be a significant (30%)
  57 * performance cost, and for other reasons may not always be desired.
  58 * So we allow it it to be disabled.
  59 */
  60bool use_spi_crc = 1;
  61module_param(use_spi_crc, bool, 0);
  62
  63static int mmc_schedule_delayed_work(struct delayed_work *work,
  64				     unsigned long delay)
  65{
  66	/*
  67	 * We use the system_freezable_wq, because of two reasons.
  68	 * First, it allows several works (not the same work item) to be
  69	 * executed simultaneously. Second, the queue becomes frozen when
  70	 * userspace becomes frozen during system PM.
  71	 */
  72	return queue_delayed_work(system_freezable_wq, work, delay);
  73}
  74
  75#ifdef CONFIG_FAIL_MMC_REQUEST
  76
  77/*
  78 * Internal function. Inject random data errors.
  79 * If mmc_data is NULL no errors are injected.
  80 */
  81static void mmc_should_fail_request(struct mmc_host *host,
  82				    struct mmc_request *mrq)
  83{
  84	struct mmc_command *cmd = mrq->cmd;
  85	struct mmc_data *data = mrq->data;
  86	static const int data_errors[] = {
  87		-ETIMEDOUT,
  88		-EILSEQ,
  89		-EIO,
  90	};
  91
  92	if (!data)
  93		return;
  94
  95	if ((cmd && cmd->error) || data->error ||
  96	    !should_fail(&host->fail_mmc_request, data->blksz * data->blocks))
  97		return;
  98
  99	data->error = data_errors[prandom_u32() % ARRAY_SIZE(data_errors)];
 100	data->bytes_xfered = (prandom_u32() % (data->bytes_xfered >> 9)) << 9;
 101}
 102
 103#else /* CONFIG_FAIL_MMC_REQUEST */
 104
 105static inline void mmc_should_fail_request(struct mmc_host *host,
 106					   struct mmc_request *mrq)
 107{
 108}
 109
 110#endif /* CONFIG_FAIL_MMC_REQUEST */
 111
 112static inline void mmc_complete_cmd(struct mmc_request *mrq)
 113{
 114	if (mrq->cap_cmd_during_tfr && !completion_done(&mrq->cmd_completion))
 115		complete_all(&mrq->cmd_completion);
 116}
 117
 118void mmc_command_done(struct mmc_host *host, struct mmc_request *mrq)
 119{
 120	if (!mrq->cap_cmd_during_tfr)
 121		return;
 122
 123	mmc_complete_cmd(mrq);
 124
 125	pr_debug("%s: cmd done, tfr ongoing (CMD%u)\n",
 126		 mmc_hostname(host), mrq->cmd->opcode);
 127}
 128EXPORT_SYMBOL(mmc_command_done);
 129
 130/**
 131 *	mmc_request_done - finish processing an MMC request
 132 *	@host: MMC host which completed request
 133 *	@mrq: MMC request which request
 134 *
 135 *	MMC drivers should call this function when they have completed
 136 *	their processing of a request.
 137 */
 138void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq)
 139{
 140	struct mmc_command *cmd = mrq->cmd;
 141	int err = cmd->error;
 142
 143	/* Flag re-tuning needed on CRC errors */
 144	if (cmd->opcode != MMC_SEND_TUNING_BLOCK &&
 145	    cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200 &&
 146	    !host->retune_crc_disable &&
 147	    (err == -EILSEQ || (mrq->sbc && mrq->sbc->error == -EILSEQ) ||
 148	    (mrq->data && mrq->data->error == -EILSEQ) ||
 149	    (mrq->stop && mrq->stop->error == -EILSEQ)))
 150		mmc_retune_needed(host);
 151
 152	if (err && cmd->retries && mmc_host_is_spi(host)) {
 153		if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
 154			cmd->retries = 0;
 155	}
 156
 157	if (host->ongoing_mrq == mrq)
 158		host->ongoing_mrq = NULL;
 159
 160	mmc_complete_cmd(mrq);
 161
 162	trace_mmc_request_done(host, mrq);
 163
 164	/*
 165	 * We list various conditions for the command to be considered
 166	 * properly done:
 167	 *
 168	 * - There was no error, OK fine then
 169	 * - We are not doing some kind of retry
 170	 * - The card was removed (...so just complete everything no matter
 171	 *   if there are errors or retries)
 172	 */
 173	if (!err || !cmd->retries || mmc_card_removed(host->card)) {
 174		mmc_should_fail_request(host, mrq);
 175
 176		if (!host->ongoing_mrq)
 177			led_trigger_event(host->led, LED_OFF);
 178
 179		if (mrq->sbc) {
 180			pr_debug("%s: req done <CMD%u>: %d: %08x %08x %08x %08x\n",
 181				mmc_hostname(host), mrq->sbc->opcode,
 182				mrq->sbc->error,
 183				mrq->sbc->resp[0], mrq->sbc->resp[1],
 184				mrq->sbc->resp[2], mrq->sbc->resp[3]);
 185		}
 186
 187		pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n",
 188			mmc_hostname(host), cmd->opcode, err,
 189			cmd->resp[0], cmd->resp[1],
 190			cmd->resp[2], cmd->resp[3]);
 191
 192		if (mrq->data) {
 193			pr_debug("%s:     %d bytes transferred: %d\n",
 194				mmc_hostname(host),
 195				mrq->data->bytes_xfered, mrq->data->error);
 196		}
 197
 198		if (mrq->stop) {
 199			pr_debug("%s:     (CMD%u): %d: %08x %08x %08x %08x\n",
 200				mmc_hostname(host), mrq->stop->opcode,
 201				mrq->stop->error,
 202				mrq->stop->resp[0], mrq->stop->resp[1],
 203				mrq->stop->resp[2], mrq->stop->resp[3]);
 204		}
 205	}
 206	/*
 207	 * Request starter must handle retries - see
 208	 * mmc_wait_for_req_done().
 209	 */
 210	if (mrq->done)
 211		mrq->done(mrq);
 212}
 213
 214EXPORT_SYMBOL(mmc_request_done);
 215
 216static void __mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
 217{
 218	int err;
 219
 220	/* Assumes host controller has been runtime resumed by mmc_claim_host */
 221	err = mmc_retune(host);
 222	if (err) {
 223		mrq->cmd->error = err;
 224		mmc_request_done(host, mrq);
 225		return;
 226	}
 227
 228	/*
 229	 * For sdio rw commands we must wait for card busy otherwise some
 230	 * sdio devices won't work properly.
 231	 * And bypass I/O abort, reset and bus suspend operations.
 232	 */
 233	if (sdio_is_io_busy(mrq->cmd->opcode, mrq->cmd->arg) &&
 234	    host->ops->card_busy) {
 235		int tries = 500; /* Wait aprox 500ms at maximum */
 236
 237		while (host->ops->card_busy(host) && --tries)
 238			mmc_delay(1);
 239
 240		if (tries == 0) {
 241			mrq->cmd->error = -EBUSY;
 242			mmc_request_done(host, mrq);
 243			return;
 244		}
 245	}
 246
 247	if (mrq->cap_cmd_during_tfr) {
 248		host->ongoing_mrq = mrq;
 249		/*
 250		 * Retry path could come through here without having waiting on
 251		 * cmd_completion, so ensure it is reinitialised.
 252		 */
 253		reinit_completion(&mrq->cmd_completion);
 254	}
 255
 256	trace_mmc_request_start(host, mrq);
 257
 258	if (host->cqe_on)
 259		host->cqe_ops->cqe_off(host);
 260
 261	host->ops->request(host, mrq);
 262}
 263
 264static void mmc_mrq_pr_debug(struct mmc_host *host, struct mmc_request *mrq,
 265			     bool cqe)
 266{
 267	if (mrq->sbc) {
 268		pr_debug("<%s: starting CMD%u arg %08x flags %08x>\n",
 269			 mmc_hostname(host), mrq->sbc->opcode,
 270			 mrq->sbc->arg, mrq->sbc->flags);
 271	}
 272
 273	if (mrq->cmd) {
 274		pr_debug("%s: starting %sCMD%u arg %08x flags %08x\n",
 275			 mmc_hostname(host), cqe ? "CQE direct " : "",
 276			 mrq->cmd->opcode, mrq->cmd->arg, mrq->cmd->flags);
 277	} else if (cqe) {
 278		pr_debug("%s: starting CQE transfer for tag %d blkaddr %u\n",
 279			 mmc_hostname(host), mrq->tag, mrq->data->blk_addr);
 280	}
 281
 282	if (mrq->data) {
 283		pr_debug("%s:     blksz %d blocks %d flags %08x "
 284			"tsac %d ms nsac %d\n",
 285			mmc_hostname(host), mrq->data->blksz,
 286			mrq->data->blocks, mrq->data->flags,
 287			mrq->data->timeout_ns / 1000000,
 288			mrq->data->timeout_clks);
 289	}
 290
 291	if (mrq->stop) {
 292		pr_debug("%s:     CMD%u arg %08x flags %08x\n",
 293			 mmc_hostname(host), mrq->stop->opcode,
 294			 mrq->stop->arg, mrq->stop->flags);
 295	}
 296}
 297
 298static int mmc_mrq_prep(struct mmc_host *host, struct mmc_request *mrq)
 299{
 300	unsigned int i, sz = 0;
 301	struct scatterlist *sg;
 302
 303	if (mrq->cmd) {
 304		mrq->cmd->error = 0;
 305		mrq->cmd->mrq = mrq;
 306		mrq->cmd->data = mrq->data;
 307	}
 308	if (mrq->sbc) {
 309		mrq->sbc->error = 0;
 310		mrq->sbc->mrq = mrq;
 311	}
 312	if (mrq->data) {
 313		if (mrq->data->blksz > host->max_blk_size ||
 314		    mrq->data->blocks > host->max_blk_count ||
 315		    mrq->data->blocks * mrq->data->blksz > host->max_req_size)
 316			return -EINVAL;
 317
 318		for_each_sg(mrq->data->sg, sg, mrq->data->sg_len, i)
 319			sz += sg->length;
 320		if (sz != mrq->data->blocks * mrq->data->blksz)
 321			return -EINVAL;
 322
 323		mrq->data->error = 0;
 324		mrq->data->mrq = mrq;
 325		if (mrq->stop) {
 326			mrq->data->stop = mrq->stop;
 327			mrq->stop->error = 0;
 328			mrq->stop->mrq = mrq;
 329		}
 330	}
 331
 332	return 0;
 333}
 334
 335int mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
 336{
 337	int err;
 338
 339	init_completion(&mrq->cmd_completion);
 340
 341	mmc_retune_hold(host);
 342
 343	if (mmc_card_removed(host->card))
 344		return -ENOMEDIUM;
 345
 346	mmc_mrq_pr_debug(host, mrq, false);
 347
 348	WARN_ON(!host->claimed);
 349
 350	err = mmc_mrq_prep(host, mrq);
 351	if (err)
 352		return err;
 353
 354	led_trigger_event(host->led, LED_FULL);
 355	__mmc_start_request(host, mrq);
 356
 357	return 0;
 358}
 359EXPORT_SYMBOL(mmc_start_request);
 360
 361static void mmc_wait_done(struct mmc_request *mrq)
 362{
 363	complete(&mrq->completion);
 364}
 365
 366static inline void mmc_wait_ongoing_tfr_cmd(struct mmc_host *host)
 367{
 368	struct mmc_request *ongoing_mrq = READ_ONCE(host->ongoing_mrq);
 369
 370	/*
 371	 * If there is an ongoing transfer, wait for the command line to become
 372	 * available.
 373	 */
 374	if (ongoing_mrq && !completion_done(&ongoing_mrq->cmd_completion))
 375		wait_for_completion(&ongoing_mrq->cmd_completion);
 376}
 377
 378static int __mmc_start_req(struct mmc_host *host, struct mmc_request *mrq)
 379{
 380	int err;
 381
 382	mmc_wait_ongoing_tfr_cmd(host);
 383
 384	init_completion(&mrq->completion);
 385	mrq->done = mmc_wait_done;
 386
 387	err = mmc_start_request(host, mrq);
 388	if (err) {
 389		mrq->cmd->error = err;
 390		mmc_complete_cmd(mrq);
 391		complete(&mrq->completion);
 392	}
 393
 394	return err;
 395}
 396
 397void mmc_wait_for_req_done(struct mmc_host *host, struct mmc_request *mrq)
 398{
 399	struct mmc_command *cmd;
 400
 401	while (1) {
 402		wait_for_completion(&mrq->completion);
 403
 404		cmd = mrq->cmd;
 405
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 406		if (!cmd->error || !cmd->retries ||
 407		    mmc_card_removed(host->card))
 408			break;
 409
 410		mmc_retune_recheck(host);
 411
 412		pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
 413			 mmc_hostname(host), cmd->opcode, cmd->error);
 414		cmd->retries--;
 415		cmd->error = 0;
 416		__mmc_start_request(host, mrq);
 417	}
 418
 419	mmc_retune_release(host);
 420}
 421EXPORT_SYMBOL(mmc_wait_for_req_done);
 422
 423/*
 424 * mmc_cqe_start_req - Start a CQE request.
 425 * @host: MMC host to start the request
 426 * @mrq: request to start
 427 *
 428 * Start the request, re-tuning if needed and it is possible. Returns an error
 429 * code if the request fails to start or -EBUSY if CQE is busy.
 430 */
 431int mmc_cqe_start_req(struct mmc_host *host, struct mmc_request *mrq)
 432{
 433	int err;
 434
 435	/*
 436	 * CQE cannot process re-tuning commands. Caller must hold retuning
 437	 * while CQE is in use.  Re-tuning can happen here only when CQE has no
 438	 * active requests i.e. this is the first.  Note, re-tuning will call
 439	 * ->cqe_off().
 440	 */
 441	err = mmc_retune(host);
 442	if (err)
 443		goto out_err;
 444
 445	mrq->host = host;
 446
 447	mmc_mrq_pr_debug(host, mrq, true);
 448
 449	err = mmc_mrq_prep(host, mrq);
 450	if (err)
 451		goto out_err;
 452
 453	err = host->cqe_ops->cqe_request(host, mrq);
 454	if (err)
 455		goto out_err;
 456
 457	trace_mmc_request_start(host, mrq);
 458
 459	return 0;
 460
 461out_err:
 462	if (mrq->cmd) {
 463		pr_debug("%s: failed to start CQE direct CMD%u, error %d\n",
 464			 mmc_hostname(host), mrq->cmd->opcode, err);
 465	} else {
 466		pr_debug("%s: failed to start CQE transfer for tag %d, error %d\n",
 467			 mmc_hostname(host), mrq->tag, err);
 468	}
 469	return err;
 470}
 471EXPORT_SYMBOL(mmc_cqe_start_req);
 472
 473/**
 474 *	mmc_cqe_request_done - CQE has finished processing an MMC request
 475 *	@host: MMC host which completed request
 476 *	@mrq: MMC request which completed
 477 *
 478 *	CQE drivers should call this function when they have completed
 479 *	their processing of a request.
 480 */
 481void mmc_cqe_request_done(struct mmc_host *host, struct mmc_request *mrq)
 482{
 483	mmc_should_fail_request(host, mrq);
 484
 485	/* Flag re-tuning needed on CRC errors */
 486	if ((mrq->cmd && mrq->cmd->error == -EILSEQ) ||
 487	    (mrq->data && mrq->data->error == -EILSEQ))
 488		mmc_retune_needed(host);
 489
 490	trace_mmc_request_done(host, mrq);
 491
 492	if (mrq->cmd) {
 493		pr_debug("%s: CQE req done (direct CMD%u): %d\n",
 494			 mmc_hostname(host), mrq->cmd->opcode, mrq->cmd->error);
 495	} else {
 496		pr_debug("%s: CQE transfer done tag %d\n",
 497			 mmc_hostname(host), mrq->tag);
 498	}
 499
 500	if (mrq->data) {
 501		pr_debug("%s:     %d bytes transferred: %d\n",
 502			 mmc_hostname(host),
 503			 mrq->data->bytes_xfered, mrq->data->error);
 504	}
 505
 506	mrq->done(mrq);
 507}
 508EXPORT_SYMBOL(mmc_cqe_request_done);
 509
 510/**
 511 *	mmc_cqe_post_req - CQE post process of a completed MMC request
 512 *	@host: MMC host
 513 *	@mrq: MMC request to be processed
 514 */
 515void mmc_cqe_post_req(struct mmc_host *host, struct mmc_request *mrq)
 516{
 517	if (host->cqe_ops->cqe_post_req)
 518		host->cqe_ops->cqe_post_req(host, mrq);
 519}
 520EXPORT_SYMBOL(mmc_cqe_post_req);
 521
 522/* Arbitrary 1 second timeout */
 523#define MMC_CQE_RECOVERY_TIMEOUT	1000
 524
 525/*
 526 * mmc_cqe_recovery - Recover from CQE errors.
 527 * @host: MMC host to recover
 528 *
 529 * Recovery consists of stopping CQE, stopping eMMC, discarding the queue in
 530 * in eMMC, and discarding the queue in CQE. CQE must call
 531 * mmc_cqe_request_done() on all requests. An error is returned if the eMMC
 532 * fails to discard its queue.
 533 */
 534int mmc_cqe_recovery(struct mmc_host *host)
 535{
 536	struct mmc_command cmd;
 537	int err;
 538
 539	mmc_retune_hold_now(host);
 540
 541	/*
 542	 * Recovery is expected seldom, if at all, but it reduces performance,
 543	 * so make sure it is not completely silent.
 544	 */
 545	pr_warn("%s: running CQE recovery\n", mmc_hostname(host));
 546
 547	host->cqe_ops->cqe_recovery_start(host);
 548
 549	memset(&cmd, 0, sizeof(cmd));
 550	cmd.opcode       = MMC_STOP_TRANSMISSION,
 551	cmd.flags        = MMC_RSP_R1B | MMC_CMD_AC,
 552	cmd.flags       &= ~MMC_RSP_CRC; /* Ignore CRC */
 553	cmd.busy_timeout = MMC_CQE_RECOVERY_TIMEOUT,
 554	mmc_wait_for_cmd(host, &cmd, 0);
 555
 556	memset(&cmd, 0, sizeof(cmd));
 557	cmd.opcode       = MMC_CMDQ_TASK_MGMT;
 558	cmd.arg          = 1; /* Discard entire queue */
 559	cmd.flags        = MMC_RSP_R1B | MMC_CMD_AC;
 560	cmd.flags       &= ~MMC_RSP_CRC; /* Ignore CRC */
 561	cmd.busy_timeout = MMC_CQE_RECOVERY_TIMEOUT,
 562	err = mmc_wait_for_cmd(host, &cmd, 0);
 563
 564	host->cqe_ops->cqe_recovery_finish(host);
 565
 566	mmc_retune_release(host);
 567
 568	return err;
 569}
 570EXPORT_SYMBOL(mmc_cqe_recovery);
 571
 572/**
 573 *	mmc_is_req_done - Determine if a 'cap_cmd_during_tfr' request is done
 574 *	@host: MMC host
 575 *	@mrq: MMC request
 576 *
 577 *	mmc_is_req_done() is used with requests that have
 578 *	mrq->cap_cmd_during_tfr = true. mmc_is_req_done() must be called after
 579 *	starting a request and before waiting for it to complete. That is,
 580 *	either in between calls to mmc_start_req(), or after mmc_wait_for_req()
 581 *	and before mmc_wait_for_req_done(). If it is called at other times the
 582 *	result is not meaningful.
 583 */
 584bool mmc_is_req_done(struct mmc_host *host, struct mmc_request *mrq)
 585{
 586	return completion_done(&mrq->completion);
 587}
 588EXPORT_SYMBOL(mmc_is_req_done);
 589
 590/**
 591 *	mmc_wait_for_req - start a request and wait for completion
 592 *	@host: MMC host to start command
 593 *	@mrq: MMC request to start
 594 *
 595 *	Start a new MMC custom command request for a host, and wait
 596 *	for the command to complete. In the case of 'cap_cmd_during_tfr'
 597 *	requests, the transfer is ongoing and the caller can issue further
 598 *	commands that do not use the data lines, and then wait by calling
 599 *	mmc_wait_for_req_done().
 600 *	Does not attempt to parse the response.
 601 */
 602void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
 603{
 604	__mmc_start_req(host, mrq);
 605
 606	if (!mrq->cap_cmd_during_tfr)
 607		mmc_wait_for_req_done(host, mrq);
 608}
 609EXPORT_SYMBOL(mmc_wait_for_req);
 610
 611/**
 612 *	mmc_wait_for_cmd - start a command and wait for completion
 613 *	@host: MMC host to start command
 614 *	@cmd: MMC command to start
 615 *	@retries: maximum number of retries
 616 *
 617 *	Start a new MMC command for a host, and wait for the command
 618 *	to complete.  Return any error that occurred while the command
 619 *	was executing.  Do not attempt to parse the response.
 620 */
 621int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries)
 622{
 623	struct mmc_request mrq = {};
 624
 625	WARN_ON(!host->claimed);
 626
 627	memset(cmd->resp, 0, sizeof(cmd->resp));
 628	cmd->retries = retries;
 629
 630	mrq.cmd = cmd;
 631	cmd->data = NULL;
 632
 633	mmc_wait_for_req(host, &mrq);
 634
 635	return cmd->error;
 636}
 637
 638EXPORT_SYMBOL(mmc_wait_for_cmd);
 639
 640/**
 641 *	mmc_set_data_timeout - set the timeout for a data command
 642 *	@data: data phase for command
 643 *	@card: the MMC card associated with the data transfer
 644 *
 645 *	Computes the data timeout parameters according to the
 646 *	correct algorithm given the card type.
 647 */
 648void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
 649{
 650	unsigned int mult;
 651
 652	/*
 653	 * SDIO cards only define an upper 1 s limit on access.
 654	 */
 655	if (mmc_card_sdio(card)) {
 656		data->timeout_ns = 1000000000;
 657		data->timeout_clks = 0;
 658		return;
 659	}
 660
 661	/*
 662	 * SD cards use a 100 multiplier rather than 10
 663	 */
 664	mult = mmc_card_sd(card) ? 100 : 10;
 665
 666	/*
 667	 * Scale up the multiplier (and therefore the timeout) by
 668	 * the r2w factor for writes.
 669	 */
 670	if (data->flags & MMC_DATA_WRITE)
 671		mult <<= card->csd.r2w_factor;
 672
 673	data->timeout_ns = card->csd.taac_ns * mult;
 674	data->timeout_clks = card->csd.taac_clks * mult;
 675
 676	/*
 677	 * SD cards also have an upper limit on the timeout.
 678	 */
 679	if (mmc_card_sd(card)) {
 680		unsigned int timeout_us, limit_us;
 681
 682		timeout_us = data->timeout_ns / 1000;
 683		if (card->host->ios.clock)
 684			timeout_us += data->timeout_clks * 1000 /
 685				(card->host->ios.clock / 1000);
 686
 687		if (data->flags & MMC_DATA_WRITE)
 688			/*
 689			 * The MMC spec "It is strongly recommended
 690			 * for hosts to implement more than 500ms
 691			 * timeout value even if the card indicates
 692			 * the 250ms maximum busy length."  Even the
 693			 * previous value of 300ms is known to be
 694			 * insufficient for some cards.
 695			 */
 696			limit_us = 3000000;
 697		else
 698			limit_us = 100000;
 699
 700		/*
 701		 * SDHC cards always use these fixed values.
 702		 */
 703		if (timeout_us > limit_us) {
 704			data->timeout_ns = limit_us * 1000;
 705			data->timeout_clks = 0;
 706		}
 707
 708		/* assign limit value if invalid */
 709		if (timeout_us == 0)
 710			data->timeout_ns = limit_us * 1000;
 711	}
 712
 713	/*
 714	 * Some cards require longer data read timeout than indicated in CSD.
 715	 * Address this by setting the read timeout to a "reasonably high"
 716	 * value. For the cards tested, 600ms has proven enough. If necessary,
 717	 * this value can be increased if other problematic cards require this.
 718	 */
 719	if (mmc_card_long_read_time(card) && data->flags & MMC_DATA_READ) {
 720		data->timeout_ns = 600000000;
 721		data->timeout_clks = 0;
 722	}
 723
 724	/*
 725	 * Some cards need very high timeouts if driven in SPI mode.
 726	 * The worst observed timeout was 900ms after writing a
 727	 * continuous stream of data until the internal logic
 728	 * overflowed.
 729	 */
 730	if (mmc_host_is_spi(card->host)) {
 731		if (data->flags & MMC_DATA_WRITE) {
 732			if (data->timeout_ns < 1000000000)
 733				data->timeout_ns = 1000000000;	/* 1s */
 734		} else {
 735			if (data->timeout_ns < 100000000)
 736				data->timeout_ns =  100000000;	/* 100ms */
 737		}
 738	}
 739}
 740EXPORT_SYMBOL(mmc_set_data_timeout);
 741
 742/*
 743 * Allow claiming an already claimed host if the context is the same or there is
 744 * no context but the task is the same.
 745 */
 746static inline bool mmc_ctx_matches(struct mmc_host *host, struct mmc_ctx *ctx,
 747				   struct task_struct *task)
 748{
 749	return host->claimer == ctx ||
 750	       (!ctx && task && host->claimer->task == task);
 751}
 752
 753static inline void mmc_ctx_set_claimer(struct mmc_host *host,
 754				       struct mmc_ctx *ctx,
 755				       struct task_struct *task)
 756{
 757	if (!host->claimer) {
 758		if (ctx)
 759			host->claimer = ctx;
 760		else
 761			host->claimer = &host->default_ctx;
 762	}
 763	if (task)
 764		host->claimer->task = task;
 765}
 766
 767/**
 768 *	__mmc_claim_host - exclusively claim a host
 769 *	@host: mmc host to claim
 770 *	@ctx: context that claims the host or NULL in which case the default
 771 *	context will be used
 772 *	@abort: whether or not the operation should be aborted
 773 *
 774 *	Claim a host for a set of operations.  If @abort is non null and
 775 *	dereference a non-zero value then this will return prematurely with
 776 *	that non-zero value without acquiring the lock.  Returns zero
 777 *	with the lock held otherwise.
 778 */
 779int __mmc_claim_host(struct mmc_host *host, struct mmc_ctx *ctx,
 780		     atomic_t *abort)
 781{
 782	struct task_struct *task = ctx ? NULL : current;
 783	DECLARE_WAITQUEUE(wait, current);
 784	unsigned long flags;
 785	int stop;
 786	bool pm = false;
 787
 788	might_sleep();
 789
 790	add_wait_queue(&host->wq, &wait);
 791	spin_lock_irqsave(&host->lock, flags);
 792	while (1) {
 793		set_current_state(TASK_UNINTERRUPTIBLE);
 794		stop = abort ? atomic_read(abort) : 0;
 795		if (stop || !host->claimed || mmc_ctx_matches(host, ctx, task))
 796			break;
 797		spin_unlock_irqrestore(&host->lock, flags);
 798		schedule();
 799		spin_lock_irqsave(&host->lock, flags);
 800	}
 801	set_current_state(TASK_RUNNING);
 802	if (!stop) {
 803		host->claimed = 1;
 804		mmc_ctx_set_claimer(host, ctx, task);
 805		host->claim_cnt += 1;
 806		if (host->claim_cnt == 1)
 807			pm = true;
 808	} else
 809		wake_up(&host->wq);
 810	spin_unlock_irqrestore(&host->lock, flags);
 811	remove_wait_queue(&host->wq, &wait);
 812
 813	if (pm)
 814		pm_runtime_get_sync(mmc_dev(host));
 815
 816	return stop;
 817}
 818EXPORT_SYMBOL(__mmc_claim_host);
 819
 820/**
 821 *	mmc_release_host - release a host
 822 *	@host: mmc host to release
 823 *
 824 *	Release a MMC host, allowing others to claim the host
 825 *	for their operations.
 826 */
 827void mmc_release_host(struct mmc_host *host)
 828{
 829	unsigned long flags;
 830
 831	WARN_ON(!host->claimed);
 832
 833	spin_lock_irqsave(&host->lock, flags);
 834	if (--host->claim_cnt) {
 835		/* Release for nested claim */
 836		spin_unlock_irqrestore(&host->lock, flags);
 837	} else {
 838		host->claimed = 0;
 839		host->claimer->task = NULL;
 840		host->claimer = NULL;
 841		spin_unlock_irqrestore(&host->lock, flags);
 842		wake_up(&host->wq);
 843		pm_runtime_mark_last_busy(mmc_dev(host));
 844		if (host->caps & MMC_CAP_SYNC_RUNTIME_PM)
 845			pm_runtime_put_sync_suspend(mmc_dev(host));
 846		else
 847			pm_runtime_put_autosuspend(mmc_dev(host));
 848	}
 849}
 850EXPORT_SYMBOL(mmc_release_host);
 851
 852/*
 853 * This is a helper function, which fetches a runtime pm reference for the
 854 * card device and also claims the host.
 855 */
 856void mmc_get_card(struct mmc_card *card, struct mmc_ctx *ctx)
 857{
 858	pm_runtime_get_sync(&card->dev);
 859	__mmc_claim_host(card->host, ctx, NULL);
 860}
 861EXPORT_SYMBOL(mmc_get_card);
 862
 863/*
 864 * This is a helper function, which releases the host and drops the runtime
 865 * pm reference for the card device.
 866 */
 867void mmc_put_card(struct mmc_card *card, struct mmc_ctx *ctx)
 868{
 869	struct mmc_host *host = card->host;
 870
 871	WARN_ON(ctx && host->claimer != ctx);
 872
 873	mmc_release_host(host);
 874	pm_runtime_mark_last_busy(&card->dev);
 875	pm_runtime_put_autosuspend(&card->dev);
 876}
 877EXPORT_SYMBOL(mmc_put_card);
 878
 879/*
 880 * Internal function that does the actual ios call to the host driver,
 881 * optionally printing some debug output.
 882 */
 883static inline void mmc_set_ios(struct mmc_host *host)
 884{
 885	struct mmc_ios *ios = &host->ios;
 886
 887	pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u "
 888		"width %u timing %u\n",
 889		 mmc_hostname(host), ios->clock, ios->bus_mode,
 890		 ios->power_mode, ios->chip_select, ios->vdd,
 891		 1 << ios->bus_width, ios->timing);
 892
 893	host->ops->set_ios(host, ios);
 894}
 895
 896/*
 897 * Control chip select pin on a host.
 898 */
 899void mmc_set_chip_select(struct mmc_host *host, int mode)
 900{
 901	host->ios.chip_select = mode;
 902	mmc_set_ios(host);
 903}
 904
 905/*
 906 * Sets the host clock to the highest possible frequency that
 907 * is below "hz".
 908 */
 909void mmc_set_clock(struct mmc_host *host, unsigned int hz)
 910{
 911	WARN_ON(hz && hz < host->f_min);
 912
 913	if (hz > host->f_max)
 914		hz = host->f_max;
 915
 916	host->ios.clock = hz;
 917	mmc_set_ios(host);
 918}
 919
 920int mmc_execute_tuning(struct mmc_card *card)
 921{
 922	struct mmc_host *host = card->host;
 923	u32 opcode;
 924	int err;
 925
 926	if (!host->ops->execute_tuning)
 927		return 0;
 928
 929	if (host->cqe_on)
 930		host->cqe_ops->cqe_off(host);
 931
 932	if (mmc_card_mmc(card))
 933		opcode = MMC_SEND_TUNING_BLOCK_HS200;
 934	else
 935		opcode = MMC_SEND_TUNING_BLOCK;
 936
 937	err = host->ops->execute_tuning(host, opcode);
 938
 939	if (err)
 940		pr_err("%s: tuning execution failed: %d\n",
 941			mmc_hostname(host), err);
 942	else
 943		mmc_retune_enable(host);
 944
 945	return err;
 946}
 947
 948/*
 949 * Change the bus mode (open drain/push-pull) of a host.
 950 */
 951void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode)
 952{
 953	host->ios.bus_mode = mode;
 954	mmc_set_ios(host);
 955}
 956
 957/*
 958 * Change data bus width of a host.
 959 */
 960void mmc_set_bus_width(struct mmc_host *host, unsigned int width)
 961{
 962	host->ios.bus_width = width;
 963	mmc_set_ios(host);
 964}
 965
 966/*
 967 * Set initial state after a power cycle or a hw_reset.
 968 */
 969void mmc_set_initial_state(struct mmc_host *host)
 970{
 971	if (host->cqe_on)
 972		host->cqe_ops->cqe_off(host);
 973
 974	mmc_retune_disable(host);
 975
 976	if (mmc_host_is_spi(host))
 977		host->ios.chip_select = MMC_CS_HIGH;
 978	else
 979		host->ios.chip_select = MMC_CS_DONTCARE;
 980	host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
 981	host->ios.bus_width = MMC_BUS_WIDTH_1;
 982	host->ios.timing = MMC_TIMING_LEGACY;
 983	host->ios.drv_type = 0;
 984	host->ios.enhanced_strobe = false;
 985
 986	/*
 987	 * Make sure we are in non-enhanced strobe mode before we
 988	 * actually enable it in ext_csd.
 989	 */
 990	if ((host->caps2 & MMC_CAP2_HS400_ES) &&
 991	     host->ops->hs400_enhanced_strobe)
 992		host->ops->hs400_enhanced_strobe(host, &host->ios);
 993
 994	mmc_set_ios(host);
 995}
 996
 997/**
 998 * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number
 999 * @vdd:	voltage (mV)
1000 * @low_bits:	prefer low bits in boundary cases
1001 *
1002 * This function returns the OCR bit number according to the provided @vdd
1003 * value. If conversion is not possible a negative errno value returned.
1004 *
1005 * Depending on the @low_bits flag the function prefers low or high OCR bits
1006 * on boundary voltages. For example,
1007 * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33);
1008 * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34);
1009 *
1010 * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21).
1011 */
1012static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits)
1013{
1014	const int max_bit = ilog2(MMC_VDD_35_36);
1015	int bit;
1016
1017	if (vdd < 1650 || vdd > 3600)
1018		return -EINVAL;
1019
1020	if (vdd >= 1650 && vdd <= 1950)
1021		return ilog2(MMC_VDD_165_195);
1022
1023	if (low_bits)
1024		vdd -= 1;
1025
1026	/* Base 2000 mV, step 100 mV, bit's base 8. */
1027	bit = (vdd - 2000) / 100 + 8;
1028	if (bit > max_bit)
1029		return max_bit;
1030	return bit;
1031}
1032
1033/**
1034 * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask
1035 * @vdd_min:	minimum voltage value (mV)
1036 * @vdd_max:	maximum voltage value (mV)
1037 *
1038 * This function returns the OCR mask bits according to the provided @vdd_min
1039 * and @vdd_max values. If conversion is not possible the function returns 0.
1040 *
1041 * Notes wrt boundary cases:
1042 * This function sets the OCR bits for all boundary voltages, for example
1043 * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 |
1044 * MMC_VDD_34_35 mask.
1045 */
1046u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max)
1047{
1048	u32 mask = 0;
1049
1050	if (vdd_max < vdd_min)
1051		return 0;
1052
1053	/* Prefer high bits for the boundary vdd_max values. */
1054	vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false);
1055	if (vdd_max < 0)
1056		return 0;
1057
1058	/* Prefer low bits for the boundary vdd_min values. */
1059	vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true);
1060	if (vdd_min < 0)
1061		return 0;
1062
1063	/* Fill the mask, from max bit to min bit. */
1064	while (vdd_max >= vdd_min)
1065		mask |= 1 << vdd_max--;
1066
1067	return mask;
1068}
1069
1070static int mmc_of_get_func_num(struct device_node *node)
1071{
1072	u32 reg;
1073	int ret;
1074
1075	ret = of_property_read_u32(node, "reg", &reg);
1076	if (ret < 0)
1077		return ret;
1078
1079	return reg;
1080}
1081
1082struct device_node *mmc_of_find_child_device(struct mmc_host *host,
1083		unsigned func_num)
1084{
1085	struct device_node *node;
1086
1087	if (!host->parent || !host->parent->of_node)
1088		return NULL;
1089
1090	for_each_child_of_node(host->parent->of_node, node) {
1091		if (mmc_of_get_func_num(node) == func_num)
1092			return node;
1093	}
1094
1095	return NULL;
1096}
1097
1098/*
1099 * Mask off any voltages we don't support and select
1100 * the lowest voltage
1101 */
1102u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
1103{
1104	int bit;
1105
1106	/*
1107	 * Sanity check the voltages that the card claims to
1108	 * support.
1109	 */
1110	if (ocr & 0x7F) {
1111		dev_warn(mmc_dev(host),
1112		"card claims to support voltages below defined range\n");
1113		ocr &= ~0x7F;
1114	}
1115
1116	ocr &= host->ocr_avail;
1117	if (!ocr) {
1118		dev_warn(mmc_dev(host), "no support for card's volts\n");
1119		return 0;
1120	}
1121
1122	if (host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) {
1123		bit = ffs(ocr) - 1;
1124		ocr &= 3 << bit;
1125		mmc_power_cycle(host, ocr);
1126	} else {
1127		bit = fls(ocr) - 1;
1128		ocr &= 3 << bit;
1129		if (bit != host->ios.vdd)
1130			dev_warn(mmc_dev(host), "exceeding card's volts\n");
1131	}
1132
1133	return ocr;
1134}
1135
1136int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage)
1137{
1138	int err = 0;
1139	int old_signal_voltage = host->ios.signal_voltage;
1140
1141	host->ios.signal_voltage = signal_voltage;
1142	if (host->ops->start_signal_voltage_switch)
1143		err = host->ops->start_signal_voltage_switch(host, &host->ios);
1144
1145	if (err)
1146		host->ios.signal_voltage = old_signal_voltage;
1147
1148	return err;
1149
1150}
1151
1152void mmc_set_initial_signal_voltage(struct mmc_host *host)
1153{
1154	/* Try to set signal voltage to 3.3V but fall back to 1.8v or 1.2v */
1155	if (!mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330))
1156		dev_dbg(mmc_dev(host), "Initial signal voltage of 3.3v\n");
1157	else if (!mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180))
1158		dev_dbg(mmc_dev(host), "Initial signal voltage of 1.8v\n");
1159	else if (!mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120))
1160		dev_dbg(mmc_dev(host), "Initial signal voltage of 1.2v\n");
1161}
1162
1163int mmc_host_set_uhs_voltage(struct mmc_host *host)
1164{
1165	u32 clock;
1166
1167	/*
1168	 * During a signal voltage level switch, the clock must be gated
1169	 * for 5 ms according to the SD spec
1170	 */
1171	clock = host->ios.clock;
1172	host->ios.clock = 0;
1173	mmc_set_ios(host);
1174
1175	if (mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180))
1176		return -EAGAIN;
1177
1178	/* Keep clock gated for at least 10 ms, though spec only says 5 ms */
1179	mmc_delay(10);
1180	host->ios.clock = clock;
1181	mmc_set_ios(host);
1182
1183	return 0;
1184}
1185
1186int mmc_set_uhs_voltage(struct mmc_host *host, u32 ocr)
1187{
1188	struct mmc_command cmd = {};
1189	int err = 0;
1190
1191	/*
1192	 * If we cannot switch voltages, return failure so the caller
1193	 * can continue without UHS mode
1194	 */
1195	if (!host->ops->start_signal_voltage_switch)
1196		return -EPERM;
1197	if (!host->ops->card_busy)
1198		pr_warn("%s: cannot verify signal voltage switch\n",
1199			mmc_hostname(host));
1200
1201	cmd.opcode = SD_SWITCH_VOLTAGE;
1202	cmd.arg = 0;
1203	cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1204
1205	err = mmc_wait_for_cmd(host, &cmd, 0);
1206	if (err)
1207		return err;
1208
1209	if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR))
1210		return -EIO;
1211
1212	/*
1213	 * The card should drive cmd and dat[0:3] low immediately
1214	 * after the response of cmd11, but wait 1 ms to be sure
1215	 */
1216	mmc_delay(1);
1217	if (host->ops->card_busy && !host->ops->card_busy(host)) {
1218		err = -EAGAIN;
1219		goto power_cycle;
1220	}
1221
1222	if (mmc_host_set_uhs_voltage(host)) {
1223		/*
1224		 * Voltages may not have been switched, but we've already
1225		 * sent CMD11, so a power cycle is required anyway
1226		 */
1227		err = -EAGAIN;
1228		goto power_cycle;
1229	}
1230
1231	/* Wait for at least 1 ms according to spec */
1232	mmc_delay(1);
1233
1234	/*
1235	 * Failure to switch is indicated by the card holding
1236	 * dat[0:3] low
1237	 */
1238	if (host->ops->card_busy && host->ops->card_busy(host))
1239		err = -EAGAIN;
1240
1241power_cycle:
1242	if (err) {
1243		pr_debug("%s: Signal voltage switch failed, "
1244			"power cycling card\n", mmc_hostname(host));
1245		mmc_power_cycle(host, ocr);
1246	}
1247
1248	return err;
1249}
1250
1251/*
1252 * Select timing parameters for host.
1253 */
1254void mmc_set_timing(struct mmc_host *host, unsigned int timing)
1255{
1256	host->ios.timing = timing;
1257	mmc_set_ios(host);
1258}
1259
1260/*
1261 * Select appropriate driver type for host.
1262 */
1263void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type)
1264{
1265	host->ios.drv_type = drv_type;
1266	mmc_set_ios(host);
1267}
1268
1269int mmc_select_drive_strength(struct mmc_card *card, unsigned int max_dtr,
1270			      int card_drv_type, int *drv_type)
1271{
1272	struct mmc_host *host = card->host;
1273	int host_drv_type = SD_DRIVER_TYPE_B;
1274
1275	*drv_type = 0;
1276
1277	if (!host->ops->select_drive_strength)
1278		return 0;
1279
1280	/* Use SD definition of driver strength for hosts */
1281	if (host->caps & MMC_CAP_DRIVER_TYPE_A)
1282		host_drv_type |= SD_DRIVER_TYPE_A;
1283
1284	if (host->caps & MMC_CAP_DRIVER_TYPE_C)
1285		host_drv_type |= SD_DRIVER_TYPE_C;
1286
1287	if (host->caps & MMC_CAP_DRIVER_TYPE_D)
1288		host_drv_type |= SD_DRIVER_TYPE_D;
1289
1290	/*
1291	 * The drive strength that the hardware can support
1292	 * depends on the board design.  Pass the appropriate
1293	 * information and let the hardware specific code
1294	 * return what is possible given the options
1295	 */
1296	return host->ops->select_drive_strength(card, max_dtr,
1297						host_drv_type,
1298						card_drv_type,
1299						drv_type);
1300}
1301
1302/*
1303 * Apply power to the MMC stack.  This is a two-stage process.
1304 * First, we enable power to the card without the clock running.
1305 * We then wait a bit for the power to stabilise.  Finally,
1306 * enable the bus drivers and clock to the card.
1307 *
1308 * We must _NOT_ enable the clock prior to power stablising.
1309 *
1310 * If a host does all the power sequencing itself, ignore the
1311 * initial MMC_POWER_UP stage.
1312 */
1313void mmc_power_up(struct mmc_host *host, u32 ocr)
1314{
1315	if (host->ios.power_mode == MMC_POWER_ON)
1316		return;
1317
1318	mmc_pwrseq_pre_power_on(host);
1319
1320	host->ios.vdd = fls(ocr) - 1;
1321	host->ios.power_mode = MMC_POWER_UP;
1322	/* Set initial state and call mmc_set_ios */
1323	mmc_set_initial_state(host);
1324
1325	mmc_set_initial_signal_voltage(host);
1326
1327	/*
1328	 * This delay should be sufficient to allow the power supply
1329	 * to reach the minimum voltage.
1330	 */
1331	mmc_delay(host->ios.power_delay_ms);
1332
1333	mmc_pwrseq_post_power_on(host);
1334
1335	host->ios.clock = host->f_init;
1336
1337	host->ios.power_mode = MMC_POWER_ON;
1338	mmc_set_ios(host);
1339
1340	/*
1341	 * This delay must be at least 74 clock sizes, or 1 ms, or the
1342	 * time required to reach a stable voltage.
1343	 */
1344	mmc_delay(host->ios.power_delay_ms);
1345}
1346
1347void mmc_power_off(struct mmc_host *host)
1348{
1349	if (host->ios.power_mode == MMC_POWER_OFF)
1350		return;
1351
1352	mmc_pwrseq_power_off(host);
1353
1354	host->ios.clock = 0;
1355	host->ios.vdd = 0;
1356
1357	host->ios.power_mode = MMC_POWER_OFF;
1358	/* Set initial state and call mmc_set_ios */
1359	mmc_set_initial_state(host);
1360
1361	/*
1362	 * Some configurations, such as the 802.11 SDIO card in the OLPC
1363	 * XO-1.5, require a short delay after poweroff before the card
1364	 * can be successfully turned on again.
1365	 */
1366	mmc_delay(1);
1367}
1368
1369void mmc_power_cycle(struct mmc_host *host, u32 ocr)
1370{
1371	mmc_power_off(host);
1372	/* Wait at least 1 ms according to SD spec */
1373	mmc_delay(1);
1374	mmc_power_up(host, ocr);
1375}
1376
1377/*
1378 * Cleanup when the last reference to the bus operator is dropped.
1379 */
1380static void __mmc_release_bus(struct mmc_host *host)
1381{
1382	WARN_ON(!host->bus_dead);
1383
1384	host->bus_ops = NULL;
1385}
1386
1387/*
1388 * Increase reference count of bus operator
1389 */
1390static inline void mmc_bus_get(struct mmc_host *host)
1391{
1392	unsigned long flags;
1393
1394	spin_lock_irqsave(&host->lock, flags);
1395	host->bus_refs++;
1396	spin_unlock_irqrestore(&host->lock, flags);
1397}
1398
1399/*
1400 * Decrease reference count of bus operator and free it if
1401 * it is the last reference.
1402 */
1403static inline void mmc_bus_put(struct mmc_host *host)
1404{
1405	unsigned long flags;
1406
1407	spin_lock_irqsave(&host->lock, flags);
1408	host->bus_refs--;
1409	if ((host->bus_refs == 0) && host->bus_ops)
1410		__mmc_release_bus(host);
1411	spin_unlock_irqrestore(&host->lock, flags);
1412}
1413
1414/*
1415 * Assign a mmc bus handler to a host. Only one bus handler may control a
1416 * host at any given time.
1417 */
1418void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops)
1419{
1420	unsigned long flags;
1421
1422	WARN_ON(!host->claimed);
1423
1424	spin_lock_irqsave(&host->lock, flags);
1425
1426	WARN_ON(host->bus_ops);
1427	WARN_ON(host->bus_refs);
1428
1429	host->bus_ops = ops;
1430	host->bus_refs = 1;
1431	host->bus_dead = 0;
1432
1433	spin_unlock_irqrestore(&host->lock, flags);
1434}
1435
1436/*
1437 * Remove the current bus handler from a host.
1438 */
1439void mmc_detach_bus(struct mmc_host *host)
1440{
1441	unsigned long flags;
1442
1443	WARN_ON(!host->claimed);
1444	WARN_ON(!host->bus_ops);
1445
1446	spin_lock_irqsave(&host->lock, flags);
1447
1448	host->bus_dead = 1;
1449
1450	spin_unlock_irqrestore(&host->lock, flags);
1451
1452	mmc_bus_put(host);
1453}
1454
1455void _mmc_detect_change(struct mmc_host *host, unsigned long delay, bool cd_irq)
 
1456{
1457	/*
1458	 * Prevent system sleep for 5s to allow user space to consume the
1459	 * corresponding uevent. This is especially useful, when CD irq is used
1460	 * as a system wakeup, but doesn't hurt in other cases.
1461	 */
1462	if (cd_irq && !(host->caps & MMC_CAP_NEEDS_POLL))
1463		__pm_wakeup_event(host->ws, 5000);
 
1464
1465	host->detect_change = 1;
1466	mmc_schedule_delayed_work(&host->detect, delay);
1467}
1468
1469/**
1470 *	mmc_detect_change - process change of state on a MMC socket
1471 *	@host: host which changed state.
1472 *	@delay: optional delay to wait before detection (jiffies)
1473 *
1474 *	MMC drivers should call this when they detect a card has been
1475 *	inserted or removed. The MMC layer will confirm that any
1476 *	present card is still functional, and initialize any newly
1477 *	inserted.
1478 */
1479void mmc_detect_change(struct mmc_host *host, unsigned long delay)
1480{
1481	_mmc_detect_change(host, delay, true);
1482}
1483EXPORT_SYMBOL(mmc_detect_change);
1484
1485void mmc_init_erase(struct mmc_card *card)
1486{
1487	unsigned int sz;
1488
1489	if (is_power_of_2(card->erase_size))
1490		card->erase_shift = ffs(card->erase_size) - 1;
1491	else
1492		card->erase_shift = 0;
1493
1494	/*
1495	 * It is possible to erase an arbitrarily large area of an SD or MMC
1496	 * card.  That is not desirable because it can take a long time
1497	 * (minutes) potentially delaying more important I/O, and also the
1498	 * timeout calculations become increasingly hugely over-estimated.
1499	 * Consequently, 'pref_erase' is defined as a guide to limit erases
1500	 * to that size and alignment.
1501	 *
1502	 * For SD cards that define Allocation Unit size, limit erases to one
1503	 * Allocation Unit at a time.
1504	 * For MMC, have a stab at ai good value and for modern cards it will
1505	 * end up being 4MiB. Note that if the value is too small, it can end
1506	 * up taking longer to erase. Also note, erase_size is already set to
1507	 * High Capacity Erase Size if available when this function is called.
1508	 */
1509	if (mmc_card_sd(card) && card->ssr.au) {
1510		card->pref_erase = card->ssr.au;
1511		card->erase_shift = ffs(card->ssr.au) - 1;
1512	} else if (card->erase_size) {
1513		sz = (card->csd.capacity << (card->csd.read_blkbits - 9)) >> 11;
1514		if (sz < 128)
1515			card->pref_erase = 512 * 1024 / 512;
1516		else if (sz < 512)
1517			card->pref_erase = 1024 * 1024 / 512;
1518		else if (sz < 1024)
1519			card->pref_erase = 2 * 1024 * 1024 / 512;
1520		else
1521			card->pref_erase = 4 * 1024 * 1024 / 512;
1522		if (card->pref_erase < card->erase_size)
1523			card->pref_erase = card->erase_size;
1524		else {
1525			sz = card->pref_erase % card->erase_size;
1526			if (sz)
1527				card->pref_erase += card->erase_size - sz;
1528		}
1529	} else
1530		card->pref_erase = 0;
1531}
1532
1533static unsigned int mmc_mmc_erase_timeout(struct mmc_card *card,
1534				          unsigned int arg, unsigned int qty)
1535{
1536	unsigned int erase_timeout;
1537
1538	if (arg == MMC_DISCARD_ARG ||
1539	    (arg == MMC_TRIM_ARG && card->ext_csd.rev >= 6)) {
1540		erase_timeout = card->ext_csd.trim_timeout;
1541	} else if (card->ext_csd.erase_group_def & 1) {
1542		/* High Capacity Erase Group Size uses HC timeouts */
1543		if (arg == MMC_TRIM_ARG)
1544			erase_timeout = card->ext_csd.trim_timeout;
1545		else
1546			erase_timeout = card->ext_csd.hc_erase_timeout;
1547	} else {
1548		/* CSD Erase Group Size uses write timeout */
1549		unsigned int mult = (10 << card->csd.r2w_factor);
1550		unsigned int timeout_clks = card->csd.taac_clks * mult;
1551		unsigned int timeout_us;
1552
1553		/* Avoid overflow: e.g. taac_ns=80000000 mult=1280 */
1554		if (card->csd.taac_ns < 1000000)
1555			timeout_us = (card->csd.taac_ns * mult) / 1000;
1556		else
1557			timeout_us = (card->csd.taac_ns / 1000) * mult;
1558
1559		/*
1560		 * ios.clock is only a target.  The real clock rate might be
1561		 * less but not that much less, so fudge it by multiplying by 2.
1562		 */
1563		timeout_clks <<= 1;
1564		timeout_us += (timeout_clks * 1000) /
1565			      (card->host->ios.clock / 1000);
1566
1567		erase_timeout = timeout_us / 1000;
1568
1569		/*
1570		 * Theoretically, the calculation could underflow so round up
1571		 * to 1ms in that case.
1572		 */
1573		if (!erase_timeout)
1574			erase_timeout = 1;
1575	}
1576
1577	/* Multiplier for secure operations */
1578	if (arg & MMC_SECURE_ARGS) {
1579		if (arg == MMC_SECURE_ERASE_ARG)
1580			erase_timeout *= card->ext_csd.sec_erase_mult;
1581		else
1582			erase_timeout *= card->ext_csd.sec_trim_mult;
1583	}
1584
1585	erase_timeout *= qty;
1586
1587	/*
1588	 * Ensure at least a 1 second timeout for SPI as per
1589	 * 'mmc_set_data_timeout()'
1590	 */
1591	if (mmc_host_is_spi(card->host) && erase_timeout < 1000)
1592		erase_timeout = 1000;
1593
1594	return erase_timeout;
1595}
1596
1597static unsigned int mmc_sd_erase_timeout(struct mmc_card *card,
1598					 unsigned int arg,
1599					 unsigned int qty)
1600{
1601	unsigned int erase_timeout;
1602
1603	/* for DISCARD none of the below calculation applies.
1604	 * the busy timeout is 250msec per discard command.
1605	 */
1606	if (arg == SD_DISCARD_ARG)
1607		return SD_DISCARD_TIMEOUT_MS;
1608
1609	if (card->ssr.erase_timeout) {
1610		/* Erase timeout specified in SD Status Register (SSR) */
1611		erase_timeout = card->ssr.erase_timeout * qty +
1612				card->ssr.erase_offset;
1613	} else {
1614		/*
1615		 * Erase timeout not specified in SD Status Register (SSR) so
1616		 * use 250ms per write block.
1617		 */
1618		erase_timeout = 250 * qty;
1619	}
1620
1621	/* Must not be less than 1 second */
1622	if (erase_timeout < 1000)
1623		erase_timeout = 1000;
1624
1625	return erase_timeout;
1626}
1627
1628static unsigned int mmc_erase_timeout(struct mmc_card *card,
1629				      unsigned int arg,
1630				      unsigned int qty)
1631{
1632	if (mmc_card_sd(card))
1633		return mmc_sd_erase_timeout(card, arg, qty);
1634	else
1635		return mmc_mmc_erase_timeout(card, arg, qty);
1636}
1637
1638static int mmc_do_erase(struct mmc_card *card, unsigned int from,
1639			unsigned int to, unsigned int arg)
1640{
1641	struct mmc_command cmd = {};
1642	unsigned int qty = 0, busy_timeout = 0;
1643	bool use_r1b_resp = false;
 
 
1644	int err;
1645
1646	mmc_retune_hold(card->host);
1647
1648	/*
1649	 * qty is used to calculate the erase timeout which depends on how many
1650	 * erase groups (or allocation units in SD terminology) are affected.
1651	 * We count erasing part of an erase group as one erase group.
1652	 * For SD, the allocation units are always a power of 2.  For MMC, the
1653	 * erase group size is almost certainly also power of 2, but it does not
1654	 * seem to insist on that in the JEDEC standard, so we fall back to
1655	 * division in that case.  SD may not specify an allocation unit size,
1656	 * in which case the timeout is based on the number of write blocks.
1657	 *
1658	 * Note that the timeout for secure trim 2 will only be correct if the
1659	 * number of erase groups specified is the same as the total of all
1660	 * preceding secure trim 1 commands.  Since the power may have been
1661	 * lost since the secure trim 1 commands occurred, it is generally
1662	 * impossible to calculate the secure trim 2 timeout correctly.
1663	 */
1664	if (card->erase_shift)
1665		qty += ((to >> card->erase_shift) -
1666			(from >> card->erase_shift)) + 1;
1667	else if (mmc_card_sd(card))
1668		qty += to - from + 1;
1669	else
1670		qty += ((to / card->erase_size) -
1671			(from / card->erase_size)) + 1;
1672
1673	if (!mmc_card_blockaddr(card)) {
1674		from <<= 9;
1675		to <<= 9;
1676	}
1677
1678	if (mmc_card_sd(card))
1679		cmd.opcode = SD_ERASE_WR_BLK_START;
1680	else
1681		cmd.opcode = MMC_ERASE_GROUP_START;
1682	cmd.arg = from;
1683	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
1684	err = mmc_wait_for_cmd(card->host, &cmd, 0);
1685	if (err) {
1686		pr_err("mmc_erase: group start error %d, "
1687		       "status %#x\n", err, cmd.resp[0]);
1688		err = -EIO;
1689		goto out;
1690	}
1691
1692	memset(&cmd, 0, sizeof(struct mmc_command));
1693	if (mmc_card_sd(card))
1694		cmd.opcode = SD_ERASE_WR_BLK_END;
1695	else
1696		cmd.opcode = MMC_ERASE_GROUP_END;
1697	cmd.arg = to;
1698	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
1699	err = mmc_wait_for_cmd(card->host, &cmd, 0);
1700	if (err) {
1701		pr_err("mmc_erase: group end error %d, status %#x\n",
1702		       err, cmd.resp[0]);
1703		err = -EIO;
1704		goto out;
1705	}
1706
1707	memset(&cmd, 0, sizeof(struct mmc_command));
1708	cmd.opcode = MMC_ERASE;
1709	cmd.arg = arg;
1710	busy_timeout = mmc_erase_timeout(card, arg, qty);
1711	/*
1712	 * If the host controller supports busy signalling and the timeout for
1713	 * the erase operation does not exceed the max_busy_timeout, we should
1714	 * use R1B response. Or we need to prevent the host from doing hw busy
1715	 * detection, which is done by converting to a R1 response instead.
1716	 * Note, some hosts requires R1B, which also means they are on their own
1717	 * when it comes to deal with the busy timeout.
1718	 */
1719	if (!(card->host->caps & MMC_CAP_NEED_RSP_BUSY) &&
1720	    card->host->max_busy_timeout &&
1721	    busy_timeout > card->host->max_busy_timeout) {
1722		cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
1723	} else {
1724		cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1725		cmd.busy_timeout = busy_timeout;
1726		use_r1b_resp = true;
1727	}
1728
1729	err = mmc_wait_for_cmd(card->host, &cmd, 0);
1730	if (err) {
1731		pr_err("mmc_erase: erase error %d, status %#x\n",
1732		       err, cmd.resp[0]);
1733		err = -EIO;
1734		goto out;
1735	}
1736
1737	if (mmc_host_is_spi(card->host))
1738		goto out;
1739
1740	/*
1741	 * In case of when R1B + MMC_CAP_WAIT_WHILE_BUSY is used, the polling
1742	 * shall be avoided.
1743	 */
1744	if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) && use_r1b_resp)
1745		goto out;
1746
1747	/* Let's poll to find out when the erase operation completes. */
1748	err = mmc_poll_for_busy(card, busy_timeout, MMC_BUSY_ERASE);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1749
1750out:
1751	mmc_retune_release(card->host);
1752	return err;
1753}
1754
1755static unsigned int mmc_align_erase_size(struct mmc_card *card,
1756					 unsigned int *from,
1757					 unsigned int *to,
1758					 unsigned int nr)
1759{
1760	unsigned int from_new = *from, nr_new = nr, rem;
1761
1762	/*
1763	 * When the 'card->erase_size' is power of 2, we can use round_up/down()
1764	 * to align the erase size efficiently.
1765	 */
1766	if (is_power_of_2(card->erase_size)) {
1767		unsigned int temp = from_new;
1768
1769		from_new = round_up(temp, card->erase_size);
1770		rem = from_new - temp;
1771
1772		if (nr_new > rem)
1773			nr_new -= rem;
1774		else
1775			return 0;
1776
1777		nr_new = round_down(nr_new, card->erase_size);
1778	} else {
1779		rem = from_new % card->erase_size;
1780		if (rem) {
1781			rem = card->erase_size - rem;
1782			from_new += rem;
1783			if (nr_new > rem)
1784				nr_new -= rem;
1785			else
1786				return 0;
1787		}
1788
1789		rem = nr_new % card->erase_size;
1790		if (rem)
1791			nr_new -= rem;
1792	}
1793
1794	if (nr_new == 0)
1795		return 0;
1796
1797	*to = from_new + nr_new;
1798	*from = from_new;
1799
1800	return nr_new;
1801}
1802
1803/**
1804 * mmc_erase - erase sectors.
1805 * @card: card to erase
1806 * @from: first sector to erase
1807 * @nr: number of sectors to erase
1808 * @arg: erase command argument
1809 *
1810 * Caller must claim host before calling this function.
1811 */
1812int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr,
1813	      unsigned int arg)
1814{
1815	unsigned int rem, to = from + nr;
1816	int err;
1817
1818	if (!(card->csd.cmdclass & CCC_ERASE))
 
1819		return -EOPNOTSUPP;
1820
1821	if (!card->erase_size)
1822		return -EOPNOTSUPP;
1823
1824	if (mmc_card_sd(card) && arg != SD_ERASE_ARG && arg != SD_DISCARD_ARG)
1825		return -EOPNOTSUPP;
1826
1827	if (mmc_card_mmc(card) && (arg & MMC_SECURE_ARGS) &&
1828	    !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN))
1829		return -EOPNOTSUPP;
1830
1831	if (mmc_card_mmc(card) && (arg & MMC_TRIM_ARGS) &&
1832	    !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN))
1833		return -EOPNOTSUPP;
1834
1835	if (arg == MMC_SECURE_ERASE_ARG) {
1836		if (from % card->erase_size || nr % card->erase_size)
1837			return -EINVAL;
1838	}
1839
1840	if (arg == MMC_ERASE_ARG)
1841		nr = mmc_align_erase_size(card, &from, &to, nr);
1842
1843	if (nr == 0)
1844		return 0;
1845
1846	if (to <= from)
1847		return -EINVAL;
1848
1849	/* 'from' and 'to' are inclusive */
1850	to -= 1;
1851
1852	/*
1853	 * Special case where only one erase-group fits in the timeout budget:
1854	 * If the region crosses an erase-group boundary on this particular
1855	 * case, we will be trimming more than one erase-group which, does not
1856	 * fit in the timeout budget of the controller, so we need to split it
1857	 * and call mmc_do_erase() twice if necessary. This special case is
1858	 * identified by the card->eg_boundary flag.
1859	 */
1860	rem = card->erase_size - (from % card->erase_size);
1861	if ((arg & MMC_TRIM_ARGS) && (card->eg_boundary) && (nr > rem)) {
1862		err = mmc_do_erase(card, from, from + rem - 1, arg);
1863		from += rem;
1864		if ((err) || (to <= from))
1865			return err;
1866	}
1867
1868	return mmc_do_erase(card, from, to, arg);
1869}
1870EXPORT_SYMBOL(mmc_erase);
1871
1872int mmc_can_erase(struct mmc_card *card)
1873{
1874	if (card->csd.cmdclass & CCC_ERASE && card->erase_size)
 
1875		return 1;
1876	return 0;
1877}
1878EXPORT_SYMBOL(mmc_can_erase);
1879
1880int mmc_can_trim(struct mmc_card *card)
1881{
1882	if ((card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN) &&
1883	    (!(card->quirks & MMC_QUIRK_TRIM_BROKEN)))
1884		return 1;
1885	return 0;
1886}
1887EXPORT_SYMBOL(mmc_can_trim);
1888
1889int mmc_can_discard(struct mmc_card *card)
1890{
1891	/*
1892	 * As there's no way to detect the discard support bit at v4.5
1893	 * use the s/w feature support filed.
1894	 */
1895	if (card->ext_csd.feature_support & MMC_DISCARD_FEATURE)
1896		return 1;
1897	return 0;
1898}
1899EXPORT_SYMBOL(mmc_can_discard);
1900
1901int mmc_can_sanitize(struct mmc_card *card)
1902{
1903	if (!mmc_can_trim(card) && !mmc_can_erase(card))
1904		return 0;
1905	if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_SANITIZE)
1906		return 1;
1907	return 0;
1908}
 
1909
1910int mmc_can_secure_erase_trim(struct mmc_card *card)
1911{
1912	if ((card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN) &&
1913	    !(card->quirks & MMC_QUIRK_SEC_ERASE_TRIM_BROKEN))
1914		return 1;
1915	return 0;
1916}
1917EXPORT_SYMBOL(mmc_can_secure_erase_trim);
1918
1919int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from,
1920			    unsigned int nr)
1921{
1922	if (!card->erase_size)
1923		return 0;
1924	if (from % card->erase_size || nr % card->erase_size)
1925		return 0;
1926	return 1;
1927}
1928EXPORT_SYMBOL(mmc_erase_group_aligned);
1929
1930static unsigned int mmc_do_calc_max_discard(struct mmc_card *card,
1931					    unsigned int arg)
1932{
1933	struct mmc_host *host = card->host;
1934	unsigned int max_discard, x, y, qty = 0, max_qty, min_qty, timeout;
1935	unsigned int last_timeout = 0;
1936	unsigned int max_busy_timeout = host->max_busy_timeout ?
1937			host->max_busy_timeout : MMC_ERASE_TIMEOUT_MS;
1938
1939	if (card->erase_shift) {
1940		max_qty = UINT_MAX >> card->erase_shift;
1941		min_qty = card->pref_erase >> card->erase_shift;
1942	} else if (mmc_card_sd(card)) {
1943		max_qty = UINT_MAX;
1944		min_qty = card->pref_erase;
1945	} else {
1946		max_qty = UINT_MAX / card->erase_size;
1947		min_qty = card->pref_erase / card->erase_size;
1948	}
1949
1950	/*
1951	 * We should not only use 'host->max_busy_timeout' as the limitation
1952	 * when deciding the max discard sectors. We should set a balance value
1953	 * to improve the erase speed, and it can not get too long timeout at
1954	 * the same time.
1955	 *
1956	 * Here we set 'card->pref_erase' as the minimal discard sectors no
1957	 * matter what size of 'host->max_busy_timeout', but if the
1958	 * 'host->max_busy_timeout' is large enough for more discard sectors,
1959	 * then we can continue to increase the max discard sectors until we
1960	 * get a balance value. In cases when the 'host->max_busy_timeout'
1961	 * isn't specified, use the default max erase timeout.
1962	 */
1963	do {
1964		y = 0;
1965		for (x = 1; x && x <= max_qty && max_qty - x >= qty; x <<= 1) {
1966			timeout = mmc_erase_timeout(card, arg, qty + x);
1967
1968			if (qty + x > min_qty && timeout > max_busy_timeout)
1969				break;
1970
1971			if (timeout < last_timeout)
1972				break;
1973			last_timeout = timeout;
1974			y = x;
1975		}
1976		qty += y;
1977	} while (y);
1978
1979	if (!qty)
1980		return 0;
1981
1982	/*
1983	 * When specifying a sector range to trim, chances are we might cross
1984	 * an erase-group boundary even if the amount of sectors is less than
1985	 * one erase-group.
1986	 * If we can only fit one erase-group in the controller timeout budget,
1987	 * we have to care that erase-group boundaries are not crossed by a
1988	 * single trim operation. We flag that special case with "eg_boundary".
1989	 * In all other cases we can just decrement qty and pretend that we
1990	 * always touch (qty + 1) erase-groups as a simple optimization.
1991	 */
1992	if (qty == 1)
1993		card->eg_boundary = 1;
1994	else
1995		qty--;
1996
1997	/* Convert qty to sectors */
1998	if (card->erase_shift)
1999		max_discard = qty << card->erase_shift;
2000	else if (mmc_card_sd(card))
2001		max_discard = qty + 1;
2002	else
2003		max_discard = qty * card->erase_size;
2004
2005	return max_discard;
2006}
2007
2008unsigned int mmc_calc_max_discard(struct mmc_card *card)
2009{
2010	struct mmc_host *host = card->host;
2011	unsigned int max_discard, max_trim;
2012
2013	/*
2014	 * Without erase_group_def set, MMC erase timeout depends on clock
2015	 * frequence which can change.  In that case, the best choice is
2016	 * just the preferred erase size.
2017	 */
2018	if (mmc_card_mmc(card) && !(card->ext_csd.erase_group_def & 1))
2019		return card->pref_erase;
2020
2021	max_discard = mmc_do_calc_max_discard(card, MMC_ERASE_ARG);
2022	if (mmc_can_trim(card)) {
2023		max_trim = mmc_do_calc_max_discard(card, MMC_TRIM_ARG);
2024		if (max_trim < max_discard || max_discard == 0)
2025			max_discard = max_trim;
2026	} else if (max_discard < card->erase_size) {
2027		max_discard = 0;
2028	}
2029	pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n",
2030		mmc_hostname(host), max_discard, host->max_busy_timeout ?
2031		host->max_busy_timeout : MMC_ERASE_TIMEOUT_MS);
2032	return max_discard;
2033}
2034EXPORT_SYMBOL(mmc_calc_max_discard);
2035
2036bool mmc_card_is_blockaddr(struct mmc_card *card)
2037{
2038	return card ? mmc_card_blockaddr(card) : false;
2039}
2040EXPORT_SYMBOL(mmc_card_is_blockaddr);
2041
2042int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen)
2043{
2044	struct mmc_command cmd = {};
2045
2046	if (mmc_card_blockaddr(card) || mmc_card_ddr52(card) ||
2047	    mmc_card_hs400(card) || mmc_card_hs400es(card))
2048		return 0;
2049
2050	cmd.opcode = MMC_SET_BLOCKLEN;
2051	cmd.arg = blocklen;
2052	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2053	return mmc_wait_for_cmd(card->host, &cmd, 5);
2054}
2055EXPORT_SYMBOL(mmc_set_blocklen);
2056
2057static void mmc_hw_reset_for_init(struct mmc_host *host)
2058{
2059	mmc_pwrseq_reset(host);
2060
2061	if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
2062		return;
2063	host->ops->hw_reset(host);
2064}
2065
2066int mmc_hw_reset(struct mmc_host *host)
2067{
2068	int ret;
2069
2070	if (!host->card)
2071		return -EINVAL;
2072
2073	mmc_bus_get(host);
2074	if (!host->bus_ops || host->bus_dead || !host->bus_ops->hw_reset) {
2075		mmc_bus_put(host);
2076		return -EOPNOTSUPP;
2077	}
2078
2079	ret = host->bus_ops->hw_reset(host);
2080	mmc_bus_put(host);
2081
2082	if (ret < 0)
2083		pr_warn("%s: tried to HW reset card, got error %d\n",
2084			mmc_hostname(host), ret);
2085
2086	return ret;
2087}
2088EXPORT_SYMBOL(mmc_hw_reset);
2089
2090int mmc_sw_reset(struct mmc_host *host)
2091{
2092	int ret;
2093
2094	if (!host->card)
2095		return -EINVAL;
2096
2097	mmc_bus_get(host);
2098	if (!host->bus_ops || host->bus_dead || !host->bus_ops->sw_reset) {
2099		mmc_bus_put(host);
2100		return -EOPNOTSUPP;
2101	}
2102
2103	ret = host->bus_ops->sw_reset(host);
2104	mmc_bus_put(host);
2105
2106	if (ret)
2107		pr_warn("%s: tried to SW reset card, got error %d\n",
2108			mmc_hostname(host), ret);
2109
2110	return ret;
2111}
2112EXPORT_SYMBOL(mmc_sw_reset);
2113
2114static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq)
2115{
2116	host->f_init = freq;
2117
2118	pr_debug("%s: %s: trying to init card at %u Hz\n",
2119		mmc_hostname(host), __func__, host->f_init);
2120
2121	mmc_power_up(host, host->ocr_avail);
2122
2123	/*
2124	 * Some eMMCs (with VCCQ always on) may not be reset after power up, so
2125	 * do a hardware reset if possible.
2126	 */
2127	mmc_hw_reset_for_init(host);
2128
2129	/*
2130	 * sdio_reset sends CMD52 to reset card.  Since we do not know
2131	 * if the card is being re-initialized, just send it.  CMD52
2132	 * should be ignored by SD/eMMC cards.
2133	 * Skip it if we already know that we do not support SDIO commands
2134	 */
2135	if (!(host->caps2 & MMC_CAP2_NO_SDIO))
2136		sdio_reset(host);
2137
2138	mmc_go_idle(host);
2139
2140	if (!(host->caps2 & MMC_CAP2_NO_SD))
2141		mmc_send_if_cond(host, host->ocr_avail);
2142
2143	/* Order's important: probe SDIO, then SD, then MMC */
2144	if (!(host->caps2 & MMC_CAP2_NO_SDIO))
2145		if (!mmc_attach_sdio(host))
2146			return 0;
2147
2148	if (!(host->caps2 & MMC_CAP2_NO_SD))
2149		if (!mmc_attach_sd(host))
2150			return 0;
2151
2152	if (!(host->caps2 & MMC_CAP2_NO_MMC))
2153		if (!mmc_attach_mmc(host))
2154			return 0;
2155
2156	mmc_power_off(host);
2157	return -EIO;
2158}
2159
2160int _mmc_detect_card_removed(struct mmc_host *host)
2161{
2162	int ret;
2163
2164	if (!host->card || mmc_card_removed(host->card))
2165		return 1;
2166
2167	ret = host->bus_ops->alive(host);
2168
2169	/*
2170	 * Card detect status and alive check may be out of sync if card is
2171	 * removed slowly, when card detect switch changes while card/slot
2172	 * pads are still contacted in hardware (refer to "SD Card Mechanical
2173	 * Addendum, Appendix C: Card Detection Switch"). So reschedule a
2174	 * detect work 200ms later for this case.
2175	 */
2176	if (!ret && host->ops->get_cd && !host->ops->get_cd(host)) {
2177		mmc_detect_change(host, msecs_to_jiffies(200));
2178		pr_debug("%s: card removed too slowly\n", mmc_hostname(host));
2179	}
2180
2181	if (ret) {
2182		mmc_card_set_removed(host->card);
2183		pr_debug("%s: card remove detected\n", mmc_hostname(host));
2184	}
2185
2186	return ret;
2187}
2188
2189int mmc_detect_card_removed(struct mmc_host *host)
2190{
2191	struct mmc_card *card = host->card;
2192	int ret;
2193
2194	WARN_ON(!host->claimed);
2195
2196	if (!card)
2197		return 1;
2198
2199	if (!mmc_card_is_removable(host))
2200		return 0;
2201
2202	ret = mmc_card_removed(card);
2203	/*
2204	 * The card will be considered unchanged unless we have been asked to
2205	 * detect a change or host requires polling to provide card detection.
2206	 */
2207	if (!host->detect_change && !(host->caps & MMC_CAP_NEEDS_POLL))
2208		return ret;
2209
2210	host->detect_change = 0;
2211	if (!ret) {
2212		ret = _mmc_detect_card_removed(host);
2213		if (ret && (host->caps & MMC_CAP_NEEDS_POLL)) {
2214			/*
2215			 * Schedule a detect work as soon as possible to let a
2216			 * rescan handle the card removal.
2217			 */
2218			cancel_delayed_work(&host->detect);
2219			_mmc_detect_change(host, 0, false);
2220		}
2221	}
2222
2223	return ret;
2224}
2225EXPORT_SYMBOL(mmc_detect_card_removed);
2226
2227void mmc_rescan(struct work_struct *work)
2228{
2229	struct mmc_host *host =
2230		container_of(work, struct mmc_host, detect.work);
2231	int i;
2232
2233	if (host->rescan_disable)
2234		return;
2235
2236	/* If there is a non-removable card registered, only scan once */
2237	if (!mmc_card_is_removable(host) && host->rescan_entered)
2238		return;
2239	host->rescan_entered = 1;
2240
2241	if (host->trigger_card_event && host->ops->card_event) {
2242		mmc_claim_host(host);
2243		host->ops->card_event(host);
2244		mmc_release_host(host);
2245		host->trigger_card_event = false;
2246	}
2247
2248	mmc_bus_get(host);
2249
2250	/* Verify a registered card to be functional, else remove it. */
2251	if (host->bus_ops && !host->bus_dead)
 
 
 
2252		host->bus_ops->detect(host);
2253
2254	host->detect_change = 0;
2255
2256	/*
2257	 * Let mmc_bus_put() free the bus/bus_ops if we've found that
2258	 * the card is no longer present.
2259	 */
2260	mmc_bus_put(host);
2261	mmc_bus_get(host);
2262
2263	/* if there still is a card present, stop here */
2264	if (host->bus_ops != NULL) {
2265		mmc_bus_put(host);
2266		goto out;
2267	}
2268
2269	/*
2270	 * Only we can add a new handler, so it's safe to
2271	 * release the lock here.
2272	 */
2273	mmc_bus_put(host);
2274
2275	mmc_claim_host(host);
2276	if (mmc_card_is_removable(host) && host->ops->get_cd &&
2277			host->ops->get_cd(host) == 0) {
2278		mmc_power_off(host);
2279		mmc_release_host(host);
2280		goto out;
2281	}
2282
2283	for (i = 0; i < ARRAY_SIZE(freqs); i++) {
2284		unsigned int freq = freqs[i];
2285		if (freq > host->f_max) {
2286			if (i + 1 < ARRAY_SIZE(freqs))
2287				continue;
2288			freq = host->f_max;
2289		}
2290		if (!mmc_rescan_try_freq(host, max(freq, host->f_min)))
2291			break;
2292		if (freqs[i] <= host->f_min)
2293			break;
2294	}
2295	mmc_release_host(host);
2296
2297 out:
2298	if (host->caps & MMC_CAP_NEEDS_POLL)
2299		mmc_schedule_delayed_work(&host->detect, HZ);
2300}
2301
2302void mmc_start_host(struct mmc_host *host)
2303{
2304	host->f_init = max(min(freqs[0], host->f_max), host->f_min);
2305	host->rescan_disable = 0;
 
2306
2307	if (!(host->caps2 & MMC_CAP2_NO_PRESCAN_POWERUP)) {
2308		mmc_claim_host(host);
2309		mmc_power_up(host, host->ocr_avail);
2310		mmc_release_host(host);
2311	}
2312
2313	mmc_gpiod_request_cd_irq(host);
2314	_mmc_detect_change(host, 0, false);
2315}
2316
2317void mmc_stop_host(struct mmc_host *host)
2318{
2319	if (host->slot.cd_irq >= 0) {
2320		mmc_gpio_set_cd_wake(host, false);
2321		disable_irq(host->slot.cd_irq);
2322	}
2323
2324	host->rescan_disable = 1;
2325	cancel_delayed_work_sync(&host->detect);
2326
2327	/* clear pm flags now and let card drivers set them as needed */
2328	host->pm_flags = 0;
2329
2330	mmc_bus_get(host);
2331	if (host->bus_ops && !host->bus_dead) {
2332		/* Calling bus_ops->remove() with a claimed host can deadlock */
2333		host->bus_ops->remove(host);
2334		mmc_claim_host(host);
2335		mmc_detach_bus(host);
2336		mmc_power_off(host);
2337		mmc_release_host(host);
2338		mmc_bus_put(host);
2339		return;
2340	}
2341	mmc_bus_put(host);
2342
2343	mmc_claim_host(host);
2344	mmc_power_off(host);
2345	mmc_release_host(host);
2346}
2347
2348#ifdef CONFIG_PM_SLEEP
2349/* Do the card removal on suspend if card is assumed removeable
2350 * Do that in pm notifier while userspace isn't yet frozen, so we will be able
2351   to sync the card.
2352*/
2353static int mmc_pm_notify(struct notifier_block *notify_block,
2354			unsigned long mode, void *unused)
2355{
2356	struct mmc_host *host = container_of(
2357		notify_block, struct mmc_host, pm_notify);
2358	unsigned long flags;
2359	int err = 0;
2360
2361	switch (mode) {
2362	case PM_HIBERNATION_PREPARE:
2363	case PM_SUSPEND_PREPARE:
2364	case PM_RESTORE_PREPARE:
2365		spin_lock_irqsave(&host->lock, flags);
2366		host->rescan_disable = 1;
2367		spin_unlock_irqrestore(&host->lock, flags);
2368		cancel_delayed_work_sync(&host->detect);
2369
2370		if (!host->bus_ops)
2371			break;
2372
2373		/* Validate prerequisites for suspend */
2374		if (host->bus_ops->pre_suspend)
2375			err = host->bus_ops->pre_suspend(host);
2376		if (!err)
2377			break;
2378
2379		if (!mmc_card_is_removable(host)) {
2380			dev_warn(mmc_dev(host),
2381				 "pre_suspend failed for non-removable host: "
2382				 "%d\n", err);
2383			/* Avoid removing non-removable hosts */
2384			break;
2385		}
2386
2387		/* Calling bus_ops->remove() with a claimed host can deadlock */
2388		host->bus_ops->remove(host);
2389		mmc_claim_host(host);
2390		mmc_detach_bus(host);
2391		mmc_power_off(host);
2392		mmc_release_host(host);
2393		host->pm_flags = 0;
2394		break;
2395
2396	case PM_POST_SUSPEND:
2397	case PM_POST_HIBERNATION:
2398	case PM_POST_RESTORE:
2399
2400		spin_lock_irqsave(&host->lock, flags);
2401		host->rescan_disable = 0;
2402		spin_unlock_irqrestore(&host->lock, flags);
2403		_mmc_detect_change(host, 0, false);
2404
2405	}
2406
2407	return 0;
2408}
2409
2410void mmc_register_pm_notifier(struct mmc_host *host)
2411{
2412	host->pm_notify.notifier_call = mmc_pm_notify;
2413	register_pm_notifier(&host->pm_notify);
2414}
2415
2416void mmc_unregister_pm_notifier(struct mmc_host *host)
2417{
2418	unregister_pm_notifier(&host->pm_notify);
2419}
2420#endif
2421
2422static int __init mmc_init(void)
2423{
2424	int ret;
2425
2426	ret = mmc_register_bus();
2427	if (ret)
2428		return ret;
2429
2430	ret = mmc_register_host_class();
2431	if (ret)
2432		goto unregister_bus;
2433
2434	ret = sdio_register_bus();
2435	if (ret)
2436		goto unregister_host_class;
2437
2438	return 0;
2439
2440unregister_host_class:
2441	mmc_unregister_host_class();
2442unregister_bus:
2443	mmc_unregister_bus();
2444	return ret;
2445}
2446
2447static void __exit mmc_exit(void)
2448{
2449	sdio_unregister_bus();
2450	mmc_unregister_host_class();
2451	mmc_unregister_bus();
2452}
2453
2454subsys_initcall(mmc_init);
2455module_exit(mmc_exit);
2456
2457MODULE_LICENSE("GPL");