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 "crypto.h"
41	#include "bus.h"
42	#include "host.h"
43	#include "sdio_bus.h"
44	#include "pwrseq.h"
45
46	#include "mmc_ops.h"
47	#include "sd_ops.h"
48	#include "sdio_ops.h"
49
50	/* The max erase timeout, used when host->max_busy_timeout isn't specified */
51	#define MMC_ERASE_TIMEOUT_MS (60 * 1000) /* 60 s */
52	#define SD_DISCARD_TIMEOUT_MS (250)
53
54	static const unsigned freqs[] = { 400000, 300000, 200000, 100000 };
55
56	/*
57	* Enabling software CRCs on the data blocks can be a significant (30%)
58	* performance cost, and for other reasons may not always be desired.
59	* So we allow it to be disabled.
60	*/
61	bool use_spi_crc = 1;
62	module_param(use_spi_crc, bool, 0);
63
64	static int mmc_schedule_delayed_work(struct delayed_work *work,
65	unsigned long delay)
66	{
67	/*
68	* We use the system_freezable_wq, because of two reasons.
69	* First, it allows several works (not the same work item) to be
70	* executed simultaneously. Second, the queue becomes frozen when
71	* userspace becomes frozen during system PM.
72	*/
73	return queue_delayed_work(wq: system_freezable_wq, dwork: work, delay);
74	}
75
76	#ifdef CONFIG_FAIL_MMC_REQUEST
77
78	/*
79	* Internal function. Inject random data errors.
80	* If mmc_data is NULL no errors are injected.
81	*/
82	static void mmc_should_fail_request(struct mmc_host *host,
83	struct mmc_request *mrq)
84	{
85	struct mmc_command *cmd = mrq->cmd;
86	struct mmc_data *data = mrq->data;
87	static const int data_errors[] = {
88	-ETIMEDOUT,
89	-EILSEQ,
90	-EIO,
91	};
92
93	if (!data)
94	return;
95
96	if ((cmd && cmd->error) || data->error ||
97	!should_fail(attr: &host->fail_mmc_request, size: data->blksz * data->blocks))
98	return;
99
100	data->error = data_errors[get_random_u32_below(ARRAY_SIZE(data_errors))];
101	data->bytes_xfered = get_random_u32_below(ceil: data->bytes_xfered >> 9) << 9;
102	}
103
104	#else /* CONFIG_FAIL_MMC_REQUEST */
105
106	static inline void mmc_should_fail_request(struct mmc_host *host,
107	struct mmc_request *mrq)
108	{
109	}
110
111	#endif /* CONFIG_FAIL_MMC_REQUEST */
112
113	static inline void mmc_complete_cmd(struct mmc_request *mrq)
114	{
115	if (mrq->cap_cmd_during_tfr && !completion_done(x: &mrq->cmd_completion))
116	complete_all(&mrq->cmd_completion);
117	}
118
119	void mmc_command_done(struct mmc_host *host, struct mmc_request *mrq)
120	{
121	if (!mrq->cap_cmd_during_tfr)
122	return;
123
124	mmc_complete_cmd(mrq);
125
126	pr_debug("%s: cmd done, tfr ongoing (CMD%u)\n",
127	mmc_hostname(host), mrq->cmd->opcode);
128	}
129	EXPORT_SYMBOL(mmc_command_done);
130
131	/**
132	* mmc_request_done - finish processing an MMC request
133	* @host: MMC host which completed request
134	* @mrq: MMC request which request
135	*
136	* MMC drivers should call this function when they have completed
137	* their processing of a request.
138	*/
139	void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq)
140	{
141	struct mmc_command *cmd = mrq->cmd;
142	int err = cmd->error;
143
144	/* Flag re-tuning needed on CRC errors */
145	if (!mmc_op_tuning(opcode: cmd->opcode) &&
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(trigger: host->led, event: 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
214	EXPORT_SYMBOL(mmc_request_done);
215
216	static 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(opcode: mrq->cmd->opcode, arg: 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(ms: 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(x: &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
264	static 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
298	static 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
335	int mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
336	{
337	int err;
338
339	init_completion(x: &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, cqe: 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(trigger: host->led, event: LED_FULL);
355	__mmc_start_request(host, mrq);
356
357	return 0;
358	}
359	EXPORT_SYMBOL(mmc_start_request);
360
361	static void mmc_wait_done(struct mmc_request *mrq)
362	{
363	complete(&mrq->completion);
364	}
365
366	static 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(x: &ongoing_mrq->cmd_completion))
375	wait_for_completion(&ongoing_mrq->cmd_completion);
376	}
377
378	static 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(x: &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
397	void 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	}
421	EXPORT_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	*/
431	int 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, cqe: 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
461	out_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	}
471	EXPORT_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	*/
481	void 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	}
508	EXPORT_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	*/
515	void 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	}
520	EXPORT_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
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	*/
534	int 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: &cmd, MMC_CMD_RETRIES);
555
556	mmc_poll_for_busy(card: host->card, MMC_CQE_RECOVERY_TIMEOUT, retry_crc_err: true, busy_cmd: MMC_BUSY_IO);
557
558	memset(&cmd, 0, sizeof(cmd));
559	cmd.opcode = MMC_CMDQ_TASK_MGMT;
560	cmd.arg = 1; /* Discard entire queue */
561	cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
562	cmd.flags &= ~MMC_RSP_CRC; /* Ignore CRC */
563	cmd.busy_timeout = MMC_CQE_RECOVERY_TIMEOUT;
564	err = mmc_wait_for_cmd(host, cmd: &cmd, MMC_CMD_RETRIES);
565
566	host->cqe_ops->cqe_recovery_finish(host);
567
568	if (err)
569	err = mmc_wait_for_cmd(host, cmd: &cmd, MMC_CMD_RETRIES);
570
571	mmc_retune_release(host);
572
573	return err;
574	}
575	EXPORT_SYMBOL(mmc_cqe_recovery);
576
577	/**
578	* mmc_is_req_done - Determine if a 'cap_cmd_during_tfr' request is done
579	* @host: MMC host
580	* @mrq: MMC request
581	*
582	* mmc_is_req_done() is used with requests that have
583	* mrq->cap_cmd_during_tfr = true. mmc_is_req_done() must be called after
584	* starting a request and before waiting for it to complete. That is,
585	* either in between calls to mmc_start_req(), or after mmc_wait_for_req()
586	* and before mmc_wait_for_req_done(). If it is called at other times the
587	* result is not meaningful.
588	*/
589	bool mmc_is_req_done(struct mmc_host *host, struct mmc_request *mrq)
590	{
591	return completion_done(x: &mrq->completion);
592	}
593	EXPORT_SYMBOL(mmc_is_req_done);
594
595	/**
596	* mmc_wait_for_req - start a request and wait for completion
597	* @host: MMC host to start command
598	* @mrq: MMC request to start
599	*
600	* Start a new MMC custom command request for a host, and wait
601	* for the command to complete. In the case of 'cap_cmd_during_tfr'
602	* requests, the transfer is ongoing and the caller can issue further
603	* commands that do not use the data lines, and then wait by calling
604	* mmc_wait_for_req_done().
605	* Does not attempt to parse the response.
606	*/
607	void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
608	{
609	__mmc_start_req(host, mrq);
610
611	if (!mrq->cap_cmd_during_tfr)
612	mmc_wait_for_req_done(host, mrq);
613	}
614	EXPORT_SYMBOL(mmc_wait_for_req);
615
616	/**
617	* mmc_wait_for_cmd - start a command and wait for completion
618	* @host: MMC host to start command
619	* @cmd: MMC command to start
620	* @retries: maximum number of retries
621	*
622	* Start a new MMC command for a host, and wait for the command
623	* to complete. Return any error that occurred while the command
624	* was executing. Do not attempt to parse the response.
625	*/
626	int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries)
627	{
628	struct mmc_request mrq = {};
629
630	WARN_ON(!host->claimed);
631
632	memset(cmd->resp, 0, sizeof(cmd->resp));
633	cmd->retries = retries;
634
635	mrq.cmd = cmd;
636	cmd->data = NULL;
637
638	mmc_wait_for_req(host, &mrq);
639
640	return cmd->error;
641	}
642
643	EXPORT_SYMBOL(mmc_wait_for_cmd);
644
645	/**
646	* mmc_set_data_timeout - set the timeout for a data command
647	* @data: data phase for command
648	* @card: the MMC card associated with the data transfer
649	*
650	* Computes the data timeout parameters according to the
651	* correct algorithm given the card type.
652	*/
653	void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
654	{
655	unsigned int mult;
656
657	/*
658	* SDIO cards only define an upper 1 s limit on access.
659	*/
660	if (mmc_card_sdio(card)) {
661	data->timeout_ns = 1000000000;
662	data->timeout_clks = 0;
663	return;
664	}
665
666	/*
667	* SD cards use a 100 multiplier rather than 10
668	*/
669	mult = mmc_card_sd(card) ? 100 : 10;
670
671	/*
672	* Scale up the multiplier (and therefore the timeout) by
673	* the r2w factor for writes.
674	*/
675	if (data->flags & MMC_DATA_WRITE)
676	mult <<= card->csd.r2w_factor;
677
678	data->timeout_ns = card->csd.taac_ns * mult;
679	data->timeout_clks = card->csd.taac_clks * mult;
680
681	/*
682	* SD cards also have an upper limit on the timeout.
683	*/
684	if (mmc_card_sd(card)) {
685	unsigned int timeout_us, limit_us;
686
687	timeout_us = data->timeout_ns / 1000;
688	if (card->host->ios.clock)
689	timeout_us += data->timeout_clks * 1000 /
690	(card->host->ios.clock / 1000);
691
692	if (data->flags & MMC_DATA_WRITE)
693	/*
694	* The MMC spec "It is strongly recommended
695	* for hosts to implement more than 500ms
696	* timeout value even if the card indicates
697	* the 250ms maximum busy length." Even the
698	* previous value of 300ms is known to be
699	* insufficient for some cards.
700	*/
701	limit_us = 3000000;
702	else
703	limit_us = 100000;
704
705	/*
706	* SDHC cards always use these fixed values.
707	*/
708	if (timeout_us > limit_us) {
709	data->timeout_ns = limit_us * 1000;
710	data->timeout_clks = 0;
711	}
712
713	/* assign limit value if invalid */
714	if (timeout_us == 0)
715	data->timeout_ns = limit_us * 1000;
716	}
717
718	/*
719	* Some cards require longer data read timeout than indicated in CSD.
720	* Address this by setting the read timeout to a "reasonably high"
721	* value. For the cards tested, 600ms has proven enough. If necessary,
722	* this value can be increased if other problematic cards require this.
723	*/
724	if (mmc_card_long_read_time(c: card) && data->flags & MMC_DATA_READ) {
725	data->timeout_ns = 600000000;
726	data->timeout_clks = 0;
727	}
728
729	/*
730	* Some cards need very high timeouts if driven in SPI mode.
731	* The worst observed timeout was 900ms after writing a
732	* continuous stream of data until the internal logic
733	* overflowed.
734	*/
735	if (mmc_host_is_spi(card->host)) {
736	if (data->flags & MMC_DATA_WRITE) {
737	if (data->timeout_ns < 1000000000)
738	data->timeout_ns = 1000000000; /* 1s */
739	} else {
740	if (data->timeout_ns < 100000000)
741	data->timeout_ns = 100000000; /* 100ms */
742	}
743	}
744	}
745	EXPORT_SYMBOL(mmc_set_data_timeout);
746
747	/*
748	* Allow claiming an already claimed host if the context is the same or there is
749	* no context but the task is the same.
750	*/
751	static inline bool mmc_ctx_matches(struct mmc_host *host, struct mmc_ctx *ctx,
752	struct task_struct *task)
753	{
754	return host->claimer == ctx ||
755	(!ctx && task && host->claimer->task == task);
756	}
757
758	static inline void mmc_ctx_set_claimer(struct mmc_host *host,
759	struct mmc_ctx *ctx,
760	struct task_struct *task)
761	{
762	if (!host->claimer) {
763	if (ctx)
764	host->claimer = ctx;
765	else
766	host->claimer = &host->default_ctx;
767	}
768	if (task)
769	host->claimer->task = task;
770	}
771
772	/**
773	* __mmc_claim_host - exclusively claim a host
774	* @host: mmc host to claim
775	* @ctx: context that claims the host or NULL in which case the default
776	* context will be used
777	* @abort: whether or not the operation should be aborted
778	*
779	* Claim a host for a set of operations. If @abort is non null and
780	* dereference a non-zero value then this will return prematurely with
781	* that non-zero value without acquiring the lock. Returns zero
782	* with the lock held otherwise.
783	*/
784	int __mmc_claim_host(struct mmc_host *host, struct mmc_ctx *ctx,
785	atomic_t *abort)
786	{
787	struct task_struct *task = ctx ? NULL : current;
788	DECLARE_WAITQUEUE(wait, current);
789	unsigned long flags;
790	int stop;
791	bool pm = false;
792
793	might_sleep();
794
795	add_wait_queue(wq_head: &host->wq, wq_entry: &wait);
796	spin_lock_irqsave(&host->lock, flags);
797	while (1) {
798	set_current_state(TASK_UNINTERRUPTIBLE);
799	stop = abort ? atomic_read(v: abort) : 0;
800	if (stop || !host->claimed || mmc_ctx_matches(host, ctx, task))
801	break;
802	spin_unlock_irqrestore(lock: &host->lock, flags);
803	schedule();
804	spin_lock_irqsave(&host->lock, flags);
805	}
806	set_current_state(TASK_RUNNING);
807	if (!stop) {
808	host->claimed = 1;
809	mmc_ctx_set_claimer(host, ctx, task);
810	host->claim_cnt += 1;
811	if (host->claim_cnt == 1)
812	pm = true;
813	} else
814	wake_up(&host->wq);
815	spin_unlock_irqrestore(lock: &host->lock, flags);
816	remove_wait_queue(wq_head: &host->wq, wq_entry: &wait);
817
818	if (pm)
819	pm_runtime_get_sync(mmc_dev(host));
820
821	return stop;
822	}
823	EXPORT_SYMBOL(__mmc_claim_host);
824
825	/**
826	* mmc_release_host - release a host
827	* @host: mmc host to release
828	*
829	* Release a MMC host, allowing others to claim the host
830	* for their operations.
831	*/
832	void mmc_release_host(struct mmc_host *host)
833	{
834	unsigned long flags;
835
836	WARN_ON(!host->claimed);
837
838	spin_lock_irqsave(&host->lock, flags);
839	if (--host->claim_cnt) {
840	/* Release for nested claim */
841	spin_unlock_irqrestore(lock: &host->lock, flags);
842	} else {
843	host->claimed = 0;
844	host->claimer->task = NULL;
845	host->claimer = NULL;
846	spin_unlock_irqrestore(lock: &host->lock, flags);
847	wake_up(&host->wq);
848	pm_runtime_mark_last_busy(mmc_dev(host));
849	if (host->caps & MMC_CAP_SYNC_RUNTIME_PM)
850	pm_runtime_put_sync_suspend(mmc_dev(host));
851	else
852	pm_runtime_put_autosuspend(mmc_dev(host));
853	}
854	}
855	EXPORT_SYMBOL(mmc_release_host);
856
857	/*
858	* This is a helper function, which fetches a runtime pm reference for the
859	* card device and also claims the host.
860	*/
861	void mmc_get_card(struct mmc_card *card, struct mmc_ctx *ctx)
862	{
863	pm_runtime_get_sync(dev: &card->dev);
864	__mmc_claim_host(card->host, ctx, NULL);
865	}
866	EXPORT_SYMBOL(mmc_get_card);
867
868	/*
869	* This is a helper function, which releases the host and drops the runtime
870	* pm reference for the card device.
871	*/
872	void mmc_put_card(struct mmc_card *card, struct mmc_ctx *ctx)
873	{
874	struct mmc_host *host = card->host;
875
876	WARN_ON(ctx && host->claimer != ctx);
877
878	mmc_release_host(host);
879	pm_runtime_mark_last_busy(dev: &card->dev);
880	pm_runtime_put_autosuspend(dev: &card->dev);
881	}
882	EXPORT_SYMBOL(mmc_put_card);
883
884	/*
885	* Internal function that does the actual ios call to the host driver,
886	* optionally printing some debug output.
887	*/
888	static inline void mmc_set_ios(struct mmc_host *host)
889	{
890	struct mmc_ios *ios = &host->ios;
891
892	pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u "
893	"width %u timing %u\n",
894	mmc_hostname(host), ios->clock, ios->bus_mode,
895	ios->power_mode, ios->chip_select, ios->vdd,
896	1 << ios->bus_width, ios->timing);
897
898	host->ops->set_ios(host, ios);
899	}
900
901	/*
902	* Control chip select pin on a host.
903	*/
904	void mmc_set_chip_select(struct mmc_host *host, int mode)
905	{
906	host->ios.chip_select = mode;
907	mmc_set_ios(host);
908	}
909
910	/*
911	* Sets the host clock to the highest possible frequency that
912	* is below "hz".
913	*/
914	void mmc_set_clock(struct mmc_host *host, unsigned int hz)
915	{
916	WARN_ON(hz && hz < host->f_min);
917
918	if (hz > host->f_max)
919	hz = host->f_max;
920
921	host->ios.clock = hz;
922	mmc_set_ios(host);
923	}
924
925	int mmc_execute_tuning(struct mmc_card *card)
926	{
927	struct mmc_host *host = card->host;
928	u32 opcode;
929	int err;
930
931	if (!host->ops->execute_tuning)
932	return 0;
933
934	if (host->cqe_on)
935	host->cqe_ops->cqe_off(host);
936
937	if (mmc_card_mmc(card))
938	opcode = MMC_SEND_TUNING_BLOCK_HS200;
939	else
940	opcode = MMC_SEND_TUNING_BLOCK;
941
942	err = host->ops->execute_tuning(host, opcode);
943	if (!err) {
944	mmc_retune_clear(host);
945	mmc_retune_enable(host);
946	return 0;
947	}
948
949	/* Only print error when we don't check for card removal */
950	if (!host->detect_change) {
951	pr_err("%s: tuning execution failed: %d\n",
952	mmc_hostname(host), err);
953	mmc_debugfs_err_stats_inc(host, stat: MMC_ERR_TUNING);
954	}
955
956	return err;
957	}
958
959	/*
960	* Change the bus mode (open drain/push-pull) of a host.
961	*/
962	void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode)
963	{
964	host->ios.bus_mode = mode;
965	mmc_set_ios(host);
966	}
967
968	/*
969	* Change data bus width of a host.
970	*/
971	void mmc_set_bus_width(struct mmc_host *host, unsigned int width)
972	{
973	host->ios.bus_width = width;
974	mmc_set_ios(host);
975	}
976
977	/*
978	* Set initial state after a power cycle or a hw_reset.
979	*/
980	void mmc_set_initial_state(struct mmc_host *host)
981	{
982	if (host->cqe_on)
983	host->cqe_ops->cqe_off(host);
984
985	mmc_retune_disable(host);
986
987	if (mmc_host_is_spi(host))
988	host->ios.chip_select = MMC_CS_HIGH;
989	else
990	host->ios.chip_select = MMC_CS_DONTCARE;
991	host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
992	host->ios.bus_width = MMC_BUS_WIDTH_1;
993	host->ios.timing = MMC_TIMING_LEGACY;
994	host->ios.drv_type = 0;
995	host->ios.enhanced_strobe = false;
996
997	/*
998	* Make sure we are in non-enhanced strobe mode before we
999	* actually enable it in ext_csd.
1000	*/
1001	if ((host->caps2 & MMC_CAP2_HS400_ES) &&
1002	host->ops->hs400_enhanced_strobe)
1003	host->ops->hs400_enhanced_strobe(host, &host->ios);
1004
1005	mmc_set_ios(host);
1006
1007	mmc_crypto_set_initial_state(host);
1008	}
1009
1010	/**
1011	* mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number
1012	* @vdd: voltage (mV)
1013	* @low_bits: prefer low bits in boundary cases
1014	*
1015	* This function returns the OCR bit number according to the provided @vdd
1016	* value. If conversion is not possible a negative errno value returned.
1017	*
1018	* Depending on the @low_bits flag the function prefers low or high OCR bits
1019	* on boundary voltages. For example,
1020	* with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33);
1021	* with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34);
1022	*
1023	* Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21).
1024	*/
1025	static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits)
1026	{
1027	const int max_bit = ilog2(MMC_VDD_35_36);
1028	int bit;
1029
1030	if (vdd < 1650 || vdd > 3600)
1031	return -EINVAL;
1032
1033	if (vdd >= 1650 && vdd <= 1950)
1034	return ilog2(MMC_VDD_165_195);
1035
1036	if (low_bits)
1037	vdd -= 1;
1038
1039	/* Base 2000 mV, step 100 mV, bit's base 8. */
1040	bit = (vdd - 2000) / 100 + 8;
1041	if (bit > max_bit)
1042	return max_bit;
1043	return bit;
1044	}
1045
1046	/**
1047	* mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask
1048	* @vdd_min: minimum voltage value (mV)
1049	* @vdd_max: maximum voltage value (mV)
1050	*
1051	* This function returns the OCR mask bits according to the provided @vdd_min
1052	* and @vdd_max values. If conversion is not possible the function returns 0.
1053	*
1054	* Notes wrt boundary cases:
1055	* This function sets the OCR bits for all boundary voltages, for example
1056	* [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 |
1057	* MMC_VDD_34_35 mask.
1058	*/
1059	u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max)
1060	{
1061	u32 mask = 0;
1062
1063	if (vdd_max < vdd_min)
1064	return 0;
1065
1066	/* Prefer high bits for the boundary vdd_max values. */
1067	vdd_max = mmc_vdd_to_ocrbitnum(vdd: vdd_max, low_bits: false);
1068	if (vdd_max < 0)
1069	return 0;
1070
1071	/* Prefer low bits for the boundary vdd_min values. */
1072	vdd_min = mmc_vdd_to_ocrbitnum(vdd: vdd_min, low_bits: true);
1073	if (vdd_min < 0)
1074	return 0;
1075
1076	/* Fill the mask, from max bit to min bit. */
1077	while (vdd_max >= vdd_min)
1078	mask |= 1 << vdd_max--;
1079
1080	return mask;
1081	}
1082
1083	static int mmc_of_get_func_num(struct device_node *node)
1084	{
1085	u32 reg;
1086	int ret;
1087
1088	ret = of_property_read_u32(np: node, propname: "reg", out_value: &reg);
1089	if (ret < 0)
1090	return ret;
1091
1092	return reg;
1093	}
1094
1095	struct device_node *mmc_of_find_child_device(struct mmc_host *host,
1096	unsigned func_num)
1097	{
1098	struct device_node *node;
1099
1100	if (!host->parent || !host->parent->of_node)
1101	return NULL;
1102
1103	for_each_child_of_node(host->parent->of_node, node) {
1104	if (mmc_of_get_func_num(node) == func_num)
1105	return node;
1106	}
1107
1108	return NULL;
1109	}
1110
1111	/*
1112	* Mask off any voltages we don't support and select
1113	* the lowest voltage
1114	*/
1115	u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
1116	{
1117	int bit;
1118
1119	/*
1120	* Sanity check the voltages that the card claims to
1121	* support.
1122	*/
1123	if (ocr & 0x7F) {
1124	dev_warn(mmc_dev(host),
1125	"card claims to support voltages below defined range\n");
1126	ocr &= ~0x7F;
1127	}
1128
1129	ocr &= host->ocr_avail;
1130	if (!ocr) {
1131	dev_warn(mmc_dev(host), "no support for card's volts\n");
1132	return 0;
1133	}
1134
1135	if (host->caps2 & MMC_CAP2_FULL_PWR_CYCLE) {
1136	bit = ffs(ocr) - 1;
1137	ocr &= 3 << bit;
1138	mmc_power_cycle(host, ocr);
1139	} else {
1140	bit = fls(x: ocr) - 1;
1141	/*
1142	* The bit variable represents the highest voltage bit set in
1143	* the OCR register.
1144	* To keep a range of 2 values (e.g. 3.2V/3.3V and 3.3V/3.4V),
1145	* we must shift the mask '3' with (bit - 1).
1146	*/
1147	ocr &= 3 << (bit - 1);
1148	if (bit != host->ios.vdd)
1149	dev_warn(mmc_dev(host), "exceeding card's volts\n");
1150	}
1151
1152	return ocr;
1153	}
1154
1155	int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage)
1156	{
1157	int err = 0;
1158	int old_signal_voltage = host->ios.signal_voltage;
1159
1160	host->ios.signal_voltage = signal_voltage;
1161	if (host->ops->start_signal_voltage_switch)
1162	err = host->ops->start_signal_voltage_switch(host, &host->ios);
1163
1164	if (err)
1165	host->ios.signal_voltage = old_signal_voltage;
1166
1167	return err;
1168
1169	}
1170
1171	void mmc_set_initial_signal_voltage(struct mmc_host *host)
1172	{
1173	/* Try to set signal voltage to 3.3V but fall back to 1.8v or 1.2v */
1174	if (!mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330))
1175	dev_dbg(mmc_dev(host), "Initial signal voltage of 3.3v\n");
1176	else if (!mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180))
1177	dev_dbg(mmc_dev(host), "Initial signal voltage of 1.8v\n");
1178	else if (!mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_120))
1179	dev_dbg(mmc_dev(host), "Initial signal voltage of 1.2v\n");
1180	}
1181
1182	int mmc_host_set_uhs_voltage(struct mmc_host *host)
1183	{
1184	u32 clock;
1185
1186	/*
1187	* During a signal voltage level switch, the clock must be gated
1188	* for 5 ms according to the SD spec
1189	*/
1190	clock = host->ios.clock;
1191	host->ios.clock = 0;
1192	mmc_set_ios(host);
1193
1194	if (mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180))
1195	return -EAGAIN;
1196
1197	/* Keep clock gated for at least 10 ms, though spec only says 5 ms */
1198	mmc_delay(ms: 10);
1199	host->ios.clock = clock;
1200	mmc_set_ios(host);
1201
1202	return 0;
1203	}
1204
1205	int mmc_set_uhs_voltage(struct mmc_host *host, u32 ocr)
1206	{
1207	struct mmc_command cmd = {};
1208	int err = 0;
1209
1210	/*
1211	* If we cannot switch voltages, return failure so the caller
1212	* can continue without UHS mode
1213	*/
1214	if (!host->ops->start_signal_voltage_switch)
1215	return -EPERM;
1216	if (!host->ops->card_busy)
1217	pr_warn("%s: cannot verify signal voltage switch\n",
1218	mmc_hostname(host));
1219
1220	cmd.opcode = SD_SWITCH_VOLTAGE;
1221	cmd.arg = 0;
1222	cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1223
1224	err = mmc_wait_for_cmd(host, &cmd, 0);
1225	if (err)
1226	goto power_cycle;
1227
1228	if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR))
1229	return -EIO;
1230
1231	/*
1232	* The card should drive cmd and dat[0:3] low immediately
1233	* after the response of cmd11, but wait 1 ms to be sure
1234	*/
1235	mmc_delay(ms: 1);
1236	if (host->ops->card_busy && !host->ops->card_busy(host)) {
1237	err = -EAGAIN;
1238	goto power_cycle;
1239	}
1240
1241	if (mmc_host_set_uhs_voltage(host)) {
1242	/*
1243	* Voltages may not have been switched, but we've already
1244	* sent CMD11, so a power cycle is required anyway
1245	*/
1246	err = -EAGAIN;
1247	goto power_cycle;
1248	}
1249
1250	/* Wait for at least 1 ms according to spec */
1251	mmc_delay(ms: 1);
1252
1253	/*
1254	* Failure to switch is indicated by the card holding
1255	* dat[0:3] low
1256	*/
1257	if (host->ops->card_busy && host->ops->card_busy(host))
1258	err = -EAGAIN;
1259
1260	power_cycle:
1261	if (err) {
1262	pr_debug("%s: Signal voltage switch failed, "
1263	"power cycling card\n", mmc_hostname(host));
1264	mmc_power_cycle(host, ocr);
1265	}
1266
1267	return err;
1268	}
1269
1270	/*
1271	* Select timing parameters for host.
1272	*/
1273	void mmc_set_timing(struct mmc_host *host, unsigned int timing)
1274	{
1275	host->ios.timing = timing;
1276	mmc_set_ios(host);
1277	}
1278
1279	/*
1280	* Select appropriate driver type for host.
1281	*/
1282	void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type)
1283	{
1284	host->ios.drv_type = drv_type;
1285	mmc_set_ios(host);
1286	}
1287
1288	int mmc_select_drive_strength(struct mmc_card *card, unsigned int max_dtr,
1289	int card_drv_type, int *drv_type)
1290	{
1291	struct mmc_host *host = card->host;
1292	int host_drv_type = SD_DRIVER_TYPE_B;
1293
1294	*drv_type = 0;
1295
1296	if (!host->ops->select_drive_strength)
1297	return 0;
1298
1299	/* Use SD definition of driver strength for hosts */
1300	if (host->caps & MMC_CAP_DRIVER_TYPE_A)
1301	host_drv_type |= SD_DRIVER_TYPE_A;
1302
1303	if (host->caps & MMC_CAP_DRIVER_TYPE_C)
1304	host_drv_type |= SD_DRIVER_TYPE_C;
1305
1306	if (host->caps & MMC_CAP_DRIVER_TYPE_D)
1307	host_drv_type |= SD_DRIVER_TYPE_D;
1308
1309	/*
1310	* The drive strength that the hardware can support
1311	* depends on the board design. Pass the appropriate
1312	* information and let the hardware specific code
1313	* return what is possible given the options
1314	*/
1315	return host->ops->select_drive_strength(card, max_dtr,
1316	host_drv_type,
1317	card_drv_type,
1318	drv_type);
1319	}
1320
1321	/*
1322	* Apply power to the MMC stack. This is a two-stage process.
1323	* First, we enable power to the card without the clock running.
1324	* We then wait a bit for the power to stabilise. Finally,
1325	* enable the bus drivers and clock to the card.
1326	*
1327	* We must _NOT_ enable the clock prior to power stablising.
1328	*
1329	* If a host does all the power sequencing itself, ignore the
1330	* initial MMC_POWER_UP stage.
1331	*/
1332	void mmc_power_up(struct mmc_host *host, u32 ocr)
1333	{
1334	if (host->ios.power_mode == MMC_POWER_ON)
1335	return;
1336
1337	mmc_pwrseq_pre_power_on(host);
1338
1339	host->ios.vdd = fls(x: ocr) - 1;
1340	host->ios.power_mode = MMC_POWER_UP;
1341	/* Set initial state and call mmc_set_ios */
1342	mmc_set_initial_state(host);
1343
1344	mmc_set_initial_signal_voltage(host);
1345
1346	/*
1347	* This delay should be sufficient to allow the power supply
1348	* to reach the minimum voltage.
1349	*/
1350	mmc_delay(ms: host->ios.power_delay_ms);
1351
1352	mmc_pwrseq_post_power_on(host);
1353
1354	host->ios.clock = host->f_init;
1355
1356	host->ios.power_mode = MMC_POWER_ON;
1357	mmc_set_ios(host);
1358
1359	/*
1360	* This delay must be at least 74 clock sizes, or 1 ms, or the
1361	* time required to reach a stable voltage.
1362	*/
1363	mmc_delay(ms: host->ios.power_delay_ms);
1364	}
1365
1366	void mmc_power_off(struct mmc_host *host)
1367	{
1368	if (host->ios.power_mode == MMC_POWER_OFF)
1369	return;
1370
1371	mmc_pwrseq_power_off(host);
1372
1373	host->ios.clock = 0;
1374	host->ios.vdd = 0;
1375
1376	host->ios.power_mode = MMC_POWER_OFF;
1377	/* Set initial state and call mmc_set_ios */
1378	mmc_set_initial_state(host);
1379
1380	/*
1381	* Some configurations, such as the 802.11 SDIO card in the OLPC
1382	* XO-1.5, require a short delay after poweroff before the card
1383	* can be successfully turned on again.
1384	*/
1385	mmc_delay(ms: 1);
1386	}
1387
1388	void mmc_power_cycle(struct mmc_host *host, u32 ocr)
1389	{
1390	mmc_power_off(host);
1391	/* Wait at least 1 ms according to SD spec */
1392	mmc_delay(ms: 1);
1393	mmc_power_up(host, ocr);
1394	}
1395
1396	/*
1397	* Assign a mmc bus handler to a host. Only one bus handler may control a
1398	* host at any given time.
1399	*/
1400	void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops)
1401	{
1402	host->bus_ops = ops;
1403	}
1404
1405	/*
1406	* Remove the current bus handler from a host.
1407	*/
1408	void mmc_detach_bus(struct mmc_host *host)
1409	{
1410	host->bus_ops = NULL;
1411	}
1412
1413	void _mmc_detect_change(struct mmc_host *host, unsigned long delay, bool cd_irq)
1414	{
1415	/*
1416	* Prevent system sleep for 5s to allow user space to consume the
1417	* corresponding uevent. This is especially useful, when CD irq is used
1418	* as a system wakeup, but doesn't hurt in other cases.
1419	*/
1420	if (cd_irq && !(host->caps & MMC_CAP_NEEDS_POLL))
1421	__pm_wakeup_event(ws: host->ws, msec: 5000);
1422
1423	host->detect_change = 1;
1424	mmc_schedule_delayed_work(work: &host->detect, delay);
1425	}
1426
1427	/**
1428	* mmc_detect_change - process change of state on a MMC socket
1429	* @host: host which changed state.
1430	* @delay: optional delay to wait before detection (jiffies)
1431	*
1432	* MMC drivers should call this when they detect a card has been
1433	* inserted or removed. The MMC layer will confirm that any
1434	* present card is still functional, and initialize any newly
1435	* inserted.
1436	*/
1437	void mmc_detect_change(struct mmc_host *host, unsigned long delay)
1438	{
1439	_mmc_detect_change(host, delay, cd_irq: true);
1440	}
1441	EXPORT_SYMBOL(mmc_detect_change);
1442
1443	void mmc_init_erase(struct mmc_card *card)
1444	{
1445	unsigned int sz;
1446
1447	if (is_power_of_2(n: card->erase_size))
1448	card->erase_shift = ffs(card->erase_size) - 1;
1449	else
1450	card->erase_shift = 0;
1451
1452	/*
1453	* It is possible to erase an arbitrarily large area of an SD or MMC
1454	* card. That is not desirable because it can take a long time
1455	* (minutes) potentially delaying more important I/O, and also the
1456	* timeout calculations become increasingly hugely over-estimated.
1457	* Consequently, 'pref_erase' is defined as a guide to limit erases
1458	* to that size and alignment.
1459	*
1460	* For SD cards that define Allocation Unit size, limit erases to one
1461	* Allocation Unit at a time.
1462	* For MMC, have a stab at ai good value and for modern cards it will
1463	* end up being 4MiB. Note that if the value is too small, it can end
1464	* up taking longer to erase. Also note, erase_size is already set to
1465	* High Capacity Erase Size if available when this function is called.
1466	*/
1467	if (mmc_card_sd(card) && card->ssr.au) {
1468	card->pref_erase = card->ssr.au;
1469	card->erase_shift = ffs(card->ssr.au) - 1;
1470	} else if (card->erase_size) {
1471	sz = (card->csd.capacity << (card->csd.read_blkbits - 9)) >> 11;
1472	if (sz < 128)
1473	card->pref_erase = 512 * 1024 / 512;
1474	else if (sz < 512)
1475	card->pref_erase = 1024 * 1024 / 512;
1476	else if (sz < 1024)
1477	card->pref_erase = 2 * 1024 * 1024 / 512;
1478	else
1479	card->pref_erase = 4 * 1024 * 1024 / 512;
1480	if (card->pref_erase < card->erase_size)
1481	card->pref_erase = card->erase_size;
1482	else {
1483	sz = card->pref_erase % card->erase_size;
1484	if (sz)
1485	card->pref_erase += card->erase_size - sz;
1486	}
1487	} else
1488	card->pref_erase = 0;
1489	}
1490
1491	static bool is_trim_arg(unsigned int arg)
1492	{
1493	return (arg & MMC_TRIM_OR_DISCARD_ARGS) && arg != MMC_DISCARD_ARG;
1494	}
1495
1496	static unsigned int mmc_mmc_erase_timeout(struct mmc_card *card,
1497	unsigned int arg, unsigned int qty)
1498	{
1499	unsigned int erase_timeout;
1500
1501	if (arg == MMC_DISCARD_ARG ||
1502	(arg == MMC_TRIM_ARG && card->ext_csd.rev >= 6)) {
1503	erase_timeout = card->ext_csd.trim_timeout;
1504	} else if (card->ext_csd.erase_group_def & 1) {
1505	/* High Capacity Erase Group Size uses HC timeouts */
1506	if (arg == MMC_TRIM_ARG)
1507	erase_timeout = card->ext_csd.trim_timeout;
1508	else
1509	erase_timeout = card->ext_csd.hc_erase_timeout;
1510	} else {
1511	/* CSD Erase Group Size uses write timeout */
1512	unsigned int mult = (10 << card->csd.r2w_factor);
1513	unsigned int timeout_clks = card->csd.taac_clks * mult;
1514	unsigned int timeout_us;
1515
1516	/* Avoid overflow: e.g. taac_ns=80000000 mult=1280 */
1517	if (card->csd.taac_ns < 1000000)
1518	timeout_us = (card->csd.taac_ns * mult) / 1000;
1519	else
1520	timeout_us = (card->csd.taac_ns / 1000) * mult;
1521
1522	/*
1523	* ios.clock is only a target. The real clock rate might be
1524	* less but not that much less, so fudge it by multiplying by 2.
1525	*/
1526	timeout_clks <<= 1;
1527	timeout_us += (timeout_clks * 1000) /
1528	(card->host->ios.clock / 1000);
1529
1530	erase_timeout = timeout_us / 1000;
1531
1532	/*
1533	* Theoretically, the calculation could underflow so round up
1534	* to 1ms in that case.
1535	*/
1536	if (!erase_timeout)
1537	erase_timeout = 1;
1538	}
1539
1540	/* Multiplier for secure operations */
1541	if (arg & MMC_SECURE_ARGS) {
1542	if (arg == MMC_SECURE_ERASE_ARG)
1543	erase_timeout *= card->ext_csd.sec_erase_mult;
1544	else
1545	erase_timeout *= card->ext_csd.sec_trim_mult;
1546	}
1547
1548	erase_timeout *= qty;
1549
1550	/*
1551	* Ensure at least a 1 second timeout for SPI as per
1552	* 'mmc_set_data_timeout()'
1553	*/
1554	if (mmc_host_is_spi(card->host) && erase_timeout < 1000)
1555	erase_timeout = 1000;
1556
1557	return erase_timeout;
1558	}
1559
1560	static unsigned int mmc_sd_erase_timeout(struct mmc_card *card,
1561	unsigned int arg,
1562	unsigned int qty)
1563	{
1564	unsigned int erase_timeout;
1565
1566	/* for DISCARD none of the below calculation applies.
1567	* the busy timeout is 250msec per discard command.
1568	*/
1569	if (arg == SD_DISCARD_ARG)
1570	return SD_DISCARD_TIMEOUT_MS;
1571
1572	if (card->ssr.erase_timeout) {
1573	/* Erase timeout specified in SD Status Register (SSR) */
1574	erase_timeout = card->ssr.erase_timeout * qty +
1575	card->ssr.erase_offset;
1576	} else {
1577	/*
1578	* Erase timeout not specified in SD Status Register (SSR) so
1579	* use 250ms per write block.
1580	*/
1581	erase_timeout = 250 * qty;
1582	}
1583
1584	/* Must not be less than 1 second */
1585	if (erase_timeout < 1000)
1586	erase_timeout = 1000;
1587
1588	return erase_timeout;
1589	}
1590
1591	static unsigned int mmc_erase_timeout(struct mmc_card *card,
1592	unsigned int arg,
1593	unsigned int qty)
1594	{
1595	if (mmc_card_sd(card))
1596	return mmc_sd_erase_timeout(card, arg, qty);
1597	else
1598	return mmc_mmc_erase_timeout(card, arg, qty);
1599	}
1600
1601	static int mmc_do_erase(struct mmc_card *card, unsigned int from,
1602	unsigned int to, unsigned int arg)
1603	{
1604	struct mmc_command cmd = {};
1605	unsigned int qty = 0, busy_timeout = 0;
1606	bool use_r1b_resp;
1607	int err;
1608
1609	mmc_retune_hold(host: card->host);
1610
1611	/*
1612	* qty is used to calculate the erase timeout which depends on how many
1613	* erase groups (or allocation units in SD terminology) are affected.
1614	* We count erasing part of an erase group as one erase group.
1615	* For SD, the allocation units are always a power of 2. For MMC, the
1616	* erase group size is almost certainly also power of 2, but it does not
1617	* seem to insist on that in the JEDEC standard, so we fall back to
1618	* division in that case. SD may not specify an allocation unit size,
1619	* in which case the timeout is based on the number of write blocks.
1620	*
1621	* Note that the timeout for secure trim 2 will only be correct if the
1622	* number of erase groups specified is the same as the total of all
1623	* preceding secure trim 1 commands. Since the power may have been
1624	* lost since the secure trim 1 commands occurred, it is generally
1625	* impossible to calculate the secure trim 2 timeout correctly.
1626	*/
1627	if (card->erase_shift)
1628	qty += ((to >> card->erase_shift) -
1629	(from >> card->erase_shift)) + 1;
1630	else if (mmc_card_sd(card))
1631	qty += to - from + 1;
1632	else
1633	qty += ((to / card->erase_size) -
1634	(from / card->erase_size)) + 1;
1635
1636	if (!mmc_card_blockaddr(card)) {
1637	from <<= 9;
1638	to <<= 9;
1639	}
1640
1641	if (mmc_card_sd(card))
1642	cmd.opcode = SD_ERASE_WR_BLK_START;
1643	else
1644	cmd.opcode = MMC_ERASE_GROUP_START;
1645	cmd.arg = from;
1646	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
1647	err = mmc_wait_for_cmd(card->host, &cmd, 0);
1648	if (err) {
1649	pr_err("mmc_erase: group start error %d, "
1650	"status %#x\n", err, cmd.resp[0]);
1651	err = -EIO;
1652	goto out;
1653	}
1654
1655	memset(&cmd, 0, sizeof(struct mmc_command));
1656	if (mmc_card_sd(card))
1657	cmd.opcode = SD_ERASE_WR_BLK_END;
1658	else
1659	cmd.opcode = MMC_ERASE_GROUP_END;
1660	cmd.arg = to;
1661	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
1662	err = mmc_wait_for_cmd(card->host, &cmd, 0);
1663	if (err) {
1664	pr_err("mmc_erase: group end error %d, status %#x\n",
1665	err, cmd.resp[0]);
1666	err = -EIO;
1667	goto out;
1668	}
1669
1670	memset(&cmd, 0, sizeof(struct mmc_command));
1671	cmd.opcode = MMC_ERASE;
1672	cmd.arg = arg;
1673	busy_timeout = mmc_erase_timeout(card, arg, qty);
1674	use_r1b_resp = mmc_prepare_busy_cmd(host: card->host, cmd: &cmd, timeout_ms: busy_timeout);
1675
1676	err = mmc_wait_for_cmd(card->host, &cmd, 0);
1677	if (err) {
1678	pr_err("mmc_erase: erase error %d, status %#x\n",
1679	err, cmd.resp[0]);
1680	err = -EIO;
1681	goto out;
1682	}
1683
1684	if (mmc_host_is_spi(card->host))
1685	goto out;
1686
1687	/*
1688	* In case of when R1B + MMC_CAP_WAIT_WHILE_BUSY is used, the polling
1689	* shall be avoided.
1690	*/
1691	if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) && use_r1b_resp)
1692	goto out;
1693
1694	/* Let's poll to find out when the erase operation completes. */
1695	err = mmc_poll_for_busy(card, timeout_ms: busy_timeout, retry_crc_err: false, busy_cmd: MMC_BUSY_ERASE);
1696
1697	out:
1698	mmc_retune_release(host: card->host);
1699	return err;
1700	}
1701
1702	static unsigned int mmc_align_erase_size(struct mmc_card *card,
1703	unsigned int *from,
1704	unsigned int *to,
1705	unsigned int nr)
1706	{
1707	unsigned int from_new = *from, nr_new = nr, rem;
1708
1709	/*
1710	* When the 'card->erase_size' is power of 2, we can use round_up/down()
1711	* to align the erase size efficiently.
1712	*/
1713	if (is_power_of_2(n: card->erase_size)) {
1714	unsigned int temp = from_new;
1715
1716	from_new = round_up(temp, card->erase_size);
1717	rem = from_new - temp;
1718
1719	if (nr_new > rem)
1720	nr_new -= rem;
1721	else
1722	return 0;
1723
1724	nr_new = round_down(nr_new, card->erase_size);
1725	} else {
1726	rem = from_new % card->erase_size;
1727	if (rem) {
1728	rem = card->erase_size - rem;
1729	from_new += rem;
1730	if (nr_new > rem)
1731	nr_new -= rem;
1732	else
1733	return 0;
1734	}
1735
1736	rem = nr_new % card->erase_size;
1737	if (rem)
1738	nr_new -= rem;
1739	}
1740
1741	if (nr_new == 0)
1742	return 0;
1743
1744	*to = from_new + nr_new;
1745	*from = from_new;
1746
1747	return nr_new;
1748	}
1749
1750	/**
1751	* mmc_erase - erase sectors.
1752	* @card: card to erase
1753	* @from: first sector to erase
1754	* @nr: number of sectors to erase
1755	* @arg: erase command argument
1756	*
1757	* Caller must claim host before calling this function.
1758	*/
1759	int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr,
1760	unsigned int arg)
1761	{
1762	unsigned int rem, to = from + nr;
1763	int err;
1764
1765	if (!(card->csd.cmdclass & CCC_ERASE))
1766	return -EOPNOTSUPP;
1767
1768	if (!card->erase_size)
1769	return -EOPNOTSUPP;
1770
1771	if (mmc_card_sd(card) && arg != SD_ERASE_ARG && arg != SD_DISCARD_ARG)
1772	return -EOPNOTSUPP;
1773
1774	if (mmc_card_mmc(card) && (arg & MMC_SECURE_ARGS) &&
1775	!(card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN))
1776	return -EOPNOTSUPP;
1777
1778	if (mmc_card_mmc(card) && is_trim_arg(arg) &&
1779	!(card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN))
1780	return -EOPNOTSUPP;
1781
1782	if (arg == MMC_SECURE_ERASE_ARG) {
1783	if (from % card->erase_size || nr % card->erase_size)
1784	return -EINVAL;
1785	}
1786
1787	if (arg == MMC_ERASE_ARG)
1788	nr = mmc_align_erase_size(card, from: &from, to: &to, nr);
1789
1790	if (nr == 0)
1791	return 0;
1792
1793	if (to <= from)
1794	return -EINVAL;
1795
1796	/* 'from' and 'to' are inclusive */
1797	to -= 1;
1798
1799	/*
1800	* Special case where only one erase-group fits in the timeout budget:
1801	* If the region crosses an erase-group boundary on this particular
1802	* case, we will be trimming more than one erase-group which, does not
1803	* fit in the timeout budget of the controller, so we need to split it
1804	* and call mmc_do_erase() twice if necessary. This special case is
1805	* identified by the card->eg_boundary flag.
1806	*/
1807	rem = card->erase_size - (from % card->erase_size);
1808	if ((arg & MMC_TRIM_OR_DISCARD_ARGS) && card->eg_boundary && nr > rem) {
1809	err = mmc_do_erase(card, from, to: from + rem - 1, arg);
1810	from += rem;
1811	if ((err) || (to <= from))
1812	return err;
1813	}
1814
1815	return mmc_do_erase(card, from, to, arg);
1816	}
1817	EXPORT_SYMBOL(mmc_erase);
1818
1819	int mmc_can_erase(struct mmc_card *card)
1820	{
1821	if (card->csd.cmdclass & CCC_ERASE && card->erase_size)
1822	return 1;
1823	return 0;
1824	}
1825	EXPORT_SYMBOL(mmc_can_erase);
1826
1827	int mmc_can_trim(struct mmc_card *card)
1828	{
1829	if ((card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN) &&
1830	(!(card->quirks & MMC_QUIRK_TRIM_BROKEN)))
1831	return 1;
1832	return 0;
1833	}
1834	EXPORT_SYMBOL(mmc_can_trim);
1835
1836	int mmc_can_discard(struct mmc_card *card)
1837	{
1838	/*
1839	* As there's no way to detect the discard support bit at v4.5
1840	* use the s/w feature support filed.
1841	*/
1842	if (card->ext_csd.feature_support & MMC_DISCARD_FEATURE)
1843	return 1;
1844	return 0;
1845	}
1846	EXPORT_SYMBOL(mmc_can_discard);
1847
1848	int mmc_can_sanitize(struct mmc_card *card)
1849	{
1850	if (!mmc_can_trim(card) && !mmc_can_erase(card))
1851	return 0;
1852	if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_SANITIZE)
1853	return 1;
1854	return 0;
1855	}
1856
1857	int mmc_can_secure_erase_trim(struct mmc_card *card)
1858	{
1859	if ((card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN) &&
1860	!(card->quirks & MMC_QUIRK_SEC_ERASE_TRIM_BROKEN))
1861	return 1;
1862	return 0;
1863	}
1864	EXPORT_SYMBOL(mmc_can_secure_erase_trim);
1865
1866	int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from,
1867	unsigned int nr)
1868	{
1869	if (!card->erase_size)
1870	return 0;
1871	if (from % card->erase_size || nr % card->erase_size)
1872	return 0;
1873	return 1;
1874	}
1875	EXPORT_SYMBOL(mmc_erase_group_aligned);
1876
1877	static unsigned int mmc_do_calc_max_discard(struct mmc_card *card,
1878	unsigned int arg)
1879	{
1880	struct mmc_host *host = card->host;
1881	unsigned int max_discard, x, y, qty = 0, max_qty, min_qty, timeout;
1882	unsigned int last_timeout = 0;
1883	unsigned int max_busy_timeout = host->max_busy_timeout ?
1884	host->max_busy_timeout : MMC_ERASE_TIMEOUT_MS;
1885
1886	if (card->erase_shift) {
1887	max_qty = UINT_MAX >> card->erase_shift;
1888	min_qty = card->pref_erase >> card->erase_shift;
1889	} else if (mmc_card_sd(card)) {
1890	max_qty = UINT_MAX;
1891	min_qty = card->pref_erase;
1892	} else {
1893	max_qty = UINT_MAX / card->erase_size;
1894	min_qty = card->pref_erase / card->erase_size;
1895	}
1896
1897	/*
1898	* We should not only use 'host->max_busy_timeout' as the limitation
1899	* when deciding the max discard sectors. We should set a balance value
1900	* to improve the erase speed, and it can not get too long timeout at
1901	* the same time.
1902	*
1903	* Here we set 'card->pref_erase' as the minimal discard sectors no
1904	* matter what size of 'host->max_busy_timeout', but if the
1905	* 'host->max_busy_timeout' is large enough for more discard sectors,
1906	* then we can continue to increase the max discard sectors until we
1907	* get a balance value. In cases when the 'host->max_busy_timeout'
1908	* isn't specified, use the default max erase timeout.
1909	*/
1910	do {
1911	y = 0;
1912	for (x = 1; x && x <= max_qty && max_qty - x >= qty; x <<= 1) {
1913	timeout = mmc_erase_timeout(card, arg, qty: qty + x);
1914
1915	if (qty + x > min_qty && timeout > max_busy_timeout)
1916	break;
1917
1918	if (timeout < last_timeout)
1919	break;
1920	last_timeout = timeout;
1921	y = x;
1922	}
1923	qty += y;
1924	} while (y);
1925
1926	if (!qty)
1927	return 0;
1928
1929	/*
1930	* When specifying a sector range to trim, chances are we might cross
1931	* an erase-group boundary even if the amount of sectors is less than
1932	* one erase-group.
1933	* If we can only fit one erase-group in the controller timeout budget,
1934	* we have to care that erase-group boundaries are not crossed by a
1935	* single trim operation. We flag that special case with "eg_boundary".
1936	* In all other cases we can just decrement qty and pretend that we
1937	* always touch (qty + 1) erase-groups as a simple optimization.
1938	*/
1939	if (qty == 1)
1940	card->eg_boundary = 1;
1941	else
1942	qty--;
1943
1944	/* Convert qty to sectors */
1945	if (card->erase_shift)
1946	max_discard = qty << card->erase_shift;
1947	else if (mmc_card_sd(card))
1948	max_discard = qty + 1;
1949	else
1950	max_discard = qty * card->erase_size;
1951
1952	return max_discard;
1953	}
1954
1955	unsigned int mmc_calc_max_discard(struct mmc_card *card)
1956	{
1957	struct mmc_host *host = card->host;
1958	unsigned int max_discard, max_trim;
1959
1960	/*
1961	* Without erase_group_def set, MMC erase timeout depends on clock
1962	* frequence which can change. In that case, the best choice is
1963	* just the preferred erase size.
1964	*/
1965	if (mmc_card_mmc(card) && !(card->ext_csd.erase_group_def & 1))
1966	return card->pref_erase;
1967
1968	max_discard = mmc_do_calc_max_discard(card, MMC_ERASE_ARG);
1969	if (mmc_can_trim(card)) {
1970	max_trim = mmc_do_calc_max_discard(card, MMC_TRIM_ARG);
1971	if (max_trim < max_discard || max_discard == 0)
1972	max_discard = max_trim;
1973	} else if (max_discard < card->erase_size) {
1974	max_discard = 0;
1975	}
1976	pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n",
1977	mmc_hostname(host), max_discard, host->max_busy_timeout ?
1978	host->max_busy_timeout : MMC_ERASE_TIMEOUT_MS);
1979	return max_discard;
1980	}
1981	EXPORT_SYMBOL(mmc_calc_max_discard);
1982
1983	bool mmc_card_is_blockaddr(struct mmc_card *card)
1984	{
1985	return card ? mmc_card_blockaddr(card) : false;
1986	}
1987	EXPORT_SYMBOL(mmc_card_is_blockaddr);
1988
1989	int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen)
1990	{
1991	struct mmc_command cmd = {};
1992
1993	if (mmc_card_blockaddr(card) || mmc_card_ddr52(card) ||
1994	mmc_card_hs400(card) || mmc_card_hs400es(card))
1995	return 0;
1996
1997	cmd.opcode = MMC_SET_BLOCKLEN;
1998	cmd.arg = blocklen;
1999	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
2000	return mmc_wait_for_cmd(card->host, &cmd, 5);
2001	}
2002	EXPORT_SYMBOL(mmc_set_blocklen);
2003
2004	static void mmc_hw_reset_for_init(struct mmc_host *host)
2005	{
2006	mmc_pwrseq_reset(host);
2007
2008	if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->card_hw_reset)
2009	return;
2010	host->ops->card_hw_reset(host);
2011	}
2012
2013	/**
2014	* mmc_hw_reset - reset the card in hardware
2015	* @card: card to be reset
2016	*
2017	* Hard reset the card. This function is only for upper layers, like the
2018	* block layer or card drivers. You cannot use it in host drivers (struct
2019	* mmc_card might be gone then).
2020	*
2021	* Return: 0 on success, -errno on failure
2022	*/
2023	int mmc_hw_reset(struct mmc_card *card)
2024	{
2025	struct mmc_host *host = card->host;
2026	int ret;
2027
2028	ret = host->bus_ops->hw_reset(host);
2029	if (ret < 0)
2030	pr_warn("%s: tried to HW reset card, got error %d\n",
2031	mmc_hostname(host), ret);
2032
2033	return ret;
2034	}
2035	EXPORT_SYMBOL(mmc_hw_reset);
2036
2037	int mmc_sw_reset(struct mmc_card *card)
2038	{
2039	struct mmc_host *host = card->host;
2040	int ret;
2041
2042	if (!host->bus_ops->sw_reset)
2043	return -EOPNOTSUPP;
2044
2045	ret = host->bus_ops->sw_reset(host);
2046	if (ret)
2047	pr_warn("%s: tried to SW reset card, got error %d\n",
2048	mmc_hostname(host), ret);
2049
2050	return ret;
2051	}
2052	EXPORT_SYMBOL(mmc_sw_reset);
2053
2054	static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq)
2055	{
2056	host->f_init = freq;
2057
2058	pr_debug("%s: %s: trying to init card at %u Hz\n",
2059	mmc_hostname(host), __func__, host->f_init);
2060
2061	mmc_power_up(host, ocr: host->ocr_avail);
2062
2063	/*
2064	* Some eMMCs (with VCCQ always on) may not be reset after power up, so
2065	* do a hardware reset if possible.
2066	*/
2067	mmc_hw_reset_for_init(host);
2068
2069	/*
2070	* sdio_reset sends CMD52 to reset card. Since we do not know
2071	* if the card is being re-initialized, just send it. CMD52
2072	* should be ignored by SD/eMMC cards.
2073	* Skip it if we already know that we do not support SDIO commands
2074	*/
2075	if (!(host->caps2 & MMC_CAP2_NO_SDIO))
2076	sdio_reset(host);
2077
2078	mmc_go_idle(host);
2079
2080	if (!(host->caps2 & MMC_CAP2_NO_SD)) {
2081	if (mmc_send_if_cond_pcie(host, ocr: host->ocr_avail))
2082	goto out;
2083	if (mmc_card_sd_express(host))
2084	return 0;
2085	}
2086
2087	/* Order's important: probe SDIO, then SD, then MMC */
2088	if (!(host->caps2 & MMC_CAP2_NO_SDIO))
2089	if (!mmc_attach_sdio(host))
2090	return 0;
2091
2092	if (!(host->caps2 & MMC_CAP2_NO_SD))
2093	if (!mmc_attach_sd(host))
2094	return 0;
2095
2096	if (!(host->caps2 & MMC_CAP2_NO_MMC))
2097	if (!mmc_attach_mmc(host))
2098	return 0;
2099
2100	out:
2101	mmc_power_off(host);
2102	return -EIO;
2103	}
2104
2105	int _mmc_detect_card_removed(struct mmc_host *host)
2106	{
2107	int ret;
2108
2109	if (!host->card || mmc_card_removed(host->card))
2110	return 1;
2111
2112	ret = host->bus_ops->alive(host);
2113
2114	/*
2115	* Card detect status and alive check may be out of sync if card is
2116	* removed slowly, when card detect switch changes while card/slot
2117	* pads are still contacted in hardware (refer to "SD Card Mechanical
2118	* Addendum, Appendix C: Card Detection Switch"). So reschedule a
2119	* detect work 200ms later for this case.
2120	*/
2121	if (!ret && host->ops->get_cd && !host->ops->get_cd(host)) {
2122	mmc_detect_change(host, msecs_to_jiffies(m: 200));
2123	pr_debug("%s: card removed too slowly\n", mmc_hostname(host));
2124	}
2125
2126	if (ret) {
2127	mmc_card_set_removed(host->card);
2128	pr_debug("%s: card remove detected\n", mmc_hostname(host));
2129	}
2130
2131	return ret;
2132	}
2133
2134	int mmc_detect_card_removed(struct mmc_host *host)
2135	{
2136	struct mmc_card *card = host->card;
2137	int ret;
2138
2139	WARN_ON(!host->claimed);
2140
2141	if (!card)
2142	return 1;
2143
2144	if (!mmc_card_is_removable(host))
2145	return 0;
2146
2147	ret = mmc_card_removed(card);
2148	/*
2149	* The card will be considered unchanged unless we have been asked to
2150	* detect a change or host requires polling to provide card detection.
2151	*/
2152	if (!host->detect_change && !(host->caps & MMC_CAP_NEEDS_POLL))
2153	return ret;
2154
2155	host->detect_change = 0;
2156	if (!ret) {
2157	ret = _mmc_detect_card_removed(host);
2158	if (ret && (host->caps & MMC_CAP_NEEDS_POLL)) {
2159	/*
2160	* Schedule a detect work as soon as possible to let a
2161	* rescan handle the card removal.
2162	*/
2163	cancel_delayed_work(dwork: &host->detect);
2164	_mmc_detect_change(host, delay: 0, cd_irq: false);
2165	}
2166	}
2167
2168	return ret;
2169	}
2170	EXPORT_SYMBOL(mmc_detect_card_removed);
2171
2172	int mmc_card_alternative_gpt_sector(struct mmc_card *card, sector_t *gpt_sector)
2173	{
2174	unsigned int boot_sectors_num;
2175
2176	if ((!(card->host->caps2 & MMC_CAP2_ALT_GPT_TEGRA)))
2177	return -EOPNOTSUPP;
2178
2179	/* filter out unrelated cards */
2180	if (card->ext_csd.rev < 3 ||
2181	!mmc_card_mmc(card) ||
2182	!mmc_card_is_blockaddr(card) ||
2183	mmc_card_is_removable(host: card->host))
2184	return -ENOENT;
2185
2186	/*
2187	* eMMC storage has two special boot partitions in addition to the
2188	* main one. NVIDIA's bootloader linearizes eMMC boot0->boot1->main
2189	* accesses, this means that the partition table addresses are shifted
2190	* by the size of boot partitions. In accordance with the eMMC
2191	* specification, the boot partition size is calculated as follows:
2192	*
2193	* boot partition size = 128K byte x BOOT_SIZE_MULT
2194	*
2195	* Calculate number of sectors occupied by the both boot partitions.
2196	*/
2197	boot_sectors_num = card->ext_csd.raw_boot_mult * SZ_128K /
2198	SZ_512 * MMC_NUM_BOOT_PARTITION;
2199
2200	/* Defined by NVIDIA and used by Android devices. */
2201	*gpt_sector = card->ext_csd.sectors - boot_sectors_num - 1;
2202
2203	return 0;
2204	}
2205	EXPORT_SYMBOL(mmc_card_alternative_gpt_sector);
2206
2207	void mmc_rescan(struct work_struct *work)
2208	{
2209	struct mmc_host *host =
2210	container_of(work, struct mmc_host, detect.work);
2211	int i;
2212
2213	if (host->rescan_disable)
2214	return;
2215
2216	/* If there is a non-removable card registered, only scan once */
2217	if (!mmc_card_is_removable(host) && host->rescan_entered)
2218	return;
2219	host->rescan_entered = 1;
2220
2221	if (host->trigger_card_event && host->ops->card_event) {
2222	mmc_claim_host(host);
2223	host->ops->card_event(host);
2224	mmc_release_host(host);
2225	host->trigger_card_event = false;
2226	}
2227
2228	/* Verify a registered card to be functional, else remove it. */
2229	if (host->bus_ops)
2230	host->bus_ops->detect(host);
2231
2232	host->detect_change = 0;
2233
2234	/* if there still is a card present, stop here */
2235	if (host->bus_ops != NULL)
2236	goto out;
2237
2238	mmc_claim_host(host);
2239	if (mmc_card_is_removable(host) && host->ops->get_cd &&
2240	host->ops->get_cd(host) == 0) {
2241	mmc_power_off(host);
2242	mmc_release_host(host);
2243	goto out;
2244	}
2245
2246	/* If an SD express card is present, then leave it as is. */
2247	if (mmc_card_sd_express(host)) {
2248	mmc_release_host(host);
2249	goto out;
2250	}
2251
2252	for (i = 0; i < ARRAY_SIZE(freqs); i++) {
2253	unsigned int freq = freqs[i];
2254	if (freq > host->f_max) {
2255	if (i + 1 < ARRAY_SIZE(freqs))
2256	continue;
2257	freq = host->f_max;
2258	}
2259	if (!mmc_rescan_try_freq(host, max(freq, host->f_min)))
2260	break;
2261	if (freqs[i] <= host->f_min)
2262	break;
2263	}
2264
2265	/* A non-removable card should have been detected by now. */
2266	if (!mmc_card_is_removable(host) && !host->bus_ops)
2267	pr_info("%s: Failed to initialize a non-removable card",
2268	mmc_hostname(host));
2269
2270	/*
2271	* Ignore the command timeout errors observed during
2272	* the card init as those are excepted.
2273	*/
2274	host->err_stats[MMC_ERR_CMD_TIMEOUT] = 0;
2275	mmc_release_host(host);
2276
2277	out:
2278	if (host->caps & MMC_CAP_NEEDS_POLL)
2279	mmc_schedule_delayed_work(work: &host->detect, HZ);
2280	}
2281
2282	void mmc_start_host(struct mmc_host *host)
2283	{
2284	host->f_init = max(min(freqs[0], host->f_max), host->f_min);
2285	host->rescan_disable = 0;
2286
2287	if (!(host->caps2 & MMC_CAP2_NO_PRESCAN_POWERUP)) {
2288	mmc_claim_host(host);
2289	mmc_power_up(host, ocr: host->ocr_avail);
2290	mmc_release_host(host);
2291	}
2292
2293	mmc_gpiod_request_cd_irq(host);
2294	_mmc_detect_change(host, delay: 0, cd_irq: false);
2295	}
2296
2297	void __mmc_stop_host(struct mmc_host *host)
2298	{
2299	if (host->slot.cd_irq >= 0) {
2300	mmc_gpio_set_cd_wake(host, on: false);
2301	disable_irq(irq: host->slot.cd_irq);
2302	}
2303
2304	host->rescan_disable = 1;
2305	cancel_delayed_work_sync(dwork: &host->detect);
2306	}
2307
2308	void mmc_stop_host(struct mmc_host *host)
2309	{
2310	__mmc_stop_host(host);
2311
2312	/* clear pm flags now and let card drivers set them as needed */
2313	host->pm_flags = 0;
2314
2315	if (host->bus_ops) {
2316	/* Calling bus_ops->remove() with a claimed host can deadlock */
2317	host->bus_ops->remove(host);
2318	mmc_claim_host(host);
2319	mmc_detach_bus(host);
2320	mmc_power_off(host);
2321	mmc_release_host(host);
2322	return;
2323	}
2324
2325	mmc_claim_host(host);
2326	mmc_power_off(host);
2327	mmc_release_host(host);
2328	}
2329
2330	static int __init mmc_init(void)
2331	{
2332	int ret;
2333
2334	ret = mmc_register_bus();
2335	if (ret)
2336	return ret;
2337
2338	ret = mmc_register_host_class();
2339	if (ret)
2340	goto unregister_bus;
2341
2342	ret = sdio_register_bus();
2343	if (ret)
2344	goto unregister_host_class;
2345
2346	return 0;
2347
2348	unregister_host_class:
2349	mmc_unregister_host_class();
2350	unregister_bus:
2351	mmc_unregister_bus();
2352	return ret;
2353	}
2354
2355	static void __exit mmc_exit(void)
2356	{
2357	sdio_unregister_bus();
2358	mmc_unregister_host_class();
2359	mmc_unregister_bus();
2360	}
2361
2362	subsys_initcall(mmc_init);
2363	module_exit(mmc_exit);
2364
2365	MODULE_LICENSE("GPL");
2366