2 * linux/drivers/mmc/core/core.c
4 * Copyright (C) 2003-2004 Russell King, All Rights Reserved.
5 * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
6 * Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved.
7 * MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/interrupt.h>
16 #include <linux/completion.h>
17 #include <linux/device.h>
18 #include <linux/delay.h>
19 #include <linux/pagemap.h>
20 #include <linux/err.h>
21 #include <linux/leds.h>
22 #include <linux/scatterlist.h>
23 #include <linux/log2.h>
24 #include <linux/regulator/consumer.h>
25 #include <linux/pm_runtime.h>
26 #include <linux/pm_wakeup.h>
27 #include <linux/suspend.h>
28 #include <linux/fault-inject.h>
29 #include <linux/random.h>
30 #include <linux/slab.h>
33 #include <linux/mmc/card.h>
34 #include <linux/mmc/host.h>
35 #include <linux/mmc/mmc.h>
36 #include <linux/mmc/sd.h>
37 #include <linux/mmc/slot-gpio.h>
39 #define CREATE_TRACE_POINTS
40 #include <trace/events/mmc.h>
52 /* If the device is not responding */
53 #define MMC_CORE_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute timeout */
56 * Background operations can take a long time, depending on the housekeeping
57 * operations the card has to perform.
59 #define MMC_BKOPS_MAX_TIMEOUT (4 * 60 * 1000) /* max time to wait in ms */
61 static const unsigned freqs
[] = { 400000, 300000, 200000, 100000 };
64 * Enabling software CRCs on the data blocks can be a significant (30%)
65 * performance cost, and for other reasons may not always be desired.
66 * So we allow it it to be disabled.
69 module_param(use_spi_crc
, bool, 0);
71 static int mmc_schedule_delayed_work(struct delayed_work
*work
,
75 * We use the system_freezable_wq, because of two reasons.
76 * First, it allows several works (not the same work item) to be
77 * executed simultaneously. Second, the queue becomes frozen when
78 * userspace becomes frozen during system PM.
80 return queue_delayed_work(system_freezable_wq
, work
, delay
);
83 #ifdef CONFIG_FAIL_MMC_REQUEST
86 * Internal function. Inject random data errors.
87 * If mmc_data is NULL no errors are injected.
89 static void mmc_should_fail_request(struct mmc_host
*host
,
90 struct mmc_request
*mrq
)
92 struct mmc_command
*cmd
= mrq
->cmd
;
93 struct mmc_data
*data
= mrq
->data
;
94 static const int data_errors
[] = {
103 if (cmd
->error
|| data
->error
||
104 !should_fail(&host
->fail_mmc_request
, data
->blksz
* data
->blocks
))
107 data
->error
= data_errors
[prandom_u32() % ARRAY_SIZE(data_errors
)];
108 data
->bytes_xfered
= (prandom_u32() % (data
->bytes_xfered
>> 9)) << 9;
111 #else /* CONFIG_FAIL_MMC_REQUEST */
113 static inline void mmc_should_fail_request(struct mmc_host
*host
,
114 struct mmc_request
*mrq
)
118 #endif /* CONFIG_FAIL_MMC_REQUEST */
121 * mmc_request_done - finish processing an MMC request
122 * @host: MMC host which completed request
123 * @mrq: MMC request which request
125 * MMC drivers should call this function when they have completed
126 * their processing of a request.
128 void mmc_request_done(struct mmc_host
*host
, struct mmc_request
*mrq
)
130 struct mmc_command
*cmd
= mrq
->cmd
;
131 int err
= cmd
->error
;
133 /* Flag re-tuning needed on CRC errors */
134 if ((cmd
->opcode
!= MMC_SEND_TUNING_BLOCK
&&
135 cmd
->opcode
!= MMC_SEND_TUNING_BLOCK_HS200
) &&
136 (err
== -EILSEQ
|| (mrq
->sbc
&& mrq
->sbc
->error
== -EILSEQ
) ||
137 (mrq
->data
&& mrq
->data
->error
== -EILSEQ
) ||
138 (mrq
->stop
&& mrq
->stop
->error
== -EILSEQ
)))
139 mmc_retune_needed(host
);
141 if (err
&& cmd
->retries
&& mmc_host_is_spi(host
)) {
142 if (cmd
->resp
[0] & R1_SPI_ILLEGAL_COMMAND
)
146 trace_mmc_request_done(host
, mrq
);
148 if (err
&& cmd
->retries
&& !mmc_card_removed(host
->card
)) {
150 * Request starter must handle retries - see
151 * mmc_wait_for_req_done().
156 mmc_should_fail_request(host
, mrq
);
158 led_trigger_event(host
->led
, LED_OFF
);
161 pr_debug("%s: req done <CMD%u>: %d: %08x %08x %08x %08x\n",
162 mmc_hostname(host
), mrq
->sbc
->opcode
,
164 mrq
->sbc
->resp
[0], mrq
->sbc
->resp
[1],
165 mrq
->sbc
->resp
[2], mrq
->sbc
->resp
[3]);
168 pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n",
169 mmc_hostname(host
), cmd
->opcode
, err
,
170 cmd
->resp
[0], cmd
->resp
[1],
171 cmd
->resp
[2], cmd
->resp
[3]);
174 pr_debug("%s: %d bytes transferred: %d\n",
176 mrq
->data
->bytes_xfered
, mrq
->data
->error
);
180 pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n",
181 mmc_hostname(host
), mrq
->stop
->opcode
,
183 mrq
->stop
->resp
[0], mrq
->stop
->resp
[1],
184 mrq
->stop
->resp
[2], mrq
->stop
->resp
[3]);
192 EXPORT_SYMBOL(mmc_request_done
);
194 static void __mmc_start_request(struct mmc_host
*host
, struct mmc_request
*mrq
)
198 /* Assumes host controller has been runtime resumed by mmc_claim_host */
199 err
= mmc_retune(host
);
201 mrq
->cmd
->error
= err
;
202 mmc_request_done(host
, mrq
);
207 * For sdio rw commands we must wait for card busy otherwise some
208 * sdio devices won't work properly.
210 if (mmc_is_io_op(mrq
->cmd
->opcode
) && host
->ops
->card_busy
) {
211 int tries
= 500; /* Wait aprox 500ms at maximum */
213 while (host
->ops
->card_busy(host
) && --tries
)
217 mrq
->cmd
->error
= -EBUSY
;
218 mmc_request_done(host
, mrq
);
223 trace_mmc_request_start(host
, mrq
);
225 host
->ops
->request(host
, mrq
);
228 static int mmc_start_request(struct mmc_host
*host
, struct mmc_request
*mrq
)
230 #ifdef CONFIG_MMC_DEBUG
232 struct scatterlist
*sg
;
234 mmc_retune_hold(host
);
236 if (mmc_card_removed(host
->card
))
240 pr_debug("<%s: starting CMD%u arg %08x flags %08x>\n",
241 mmc_hostname(host
), mrq
->sbc
->opcode
,
242 mrq
->sbc
->arg
, mrq
->sbc
->flags
);
245 pr_debug("%s: starting CMD%u arg %08x flags %08x\n",
246 mmc_hostname(host
), mrq
->cmd
->opcode
,
247 mrq
->cmd
->arg
, mrq
->cmd
->flags
);
250 pr_debug("%s: blksz %d blocks %d flags %08x "
251 "tsac %d ms nsac %d\n",
252 mmc_hostname(host
), mrq
->data
->blksz
,
253 mrq
->data
->blocks
, mrq
->data
->flags
,
254 mrq
->data
->timeout_ns
/ 1000000,
255 mrq
->data
->timeout_clks
);
259 pr_debug("%s: CMD%u arg %08x flags %08x\n",
260 mmc_hostname(host
), mrq
->stop
->opcode
,
261 mrq
->stop
->arg
, mrq
->stop
->flags
);
264 WARN_ON(!host
->claimed
);
273 BUG_ON(mrq
->data
->blksz
> host
->max_blk_size
);
274 BUG_ON(mrq
->data
->blocks
> host
->max_blk_count
);
275 BUG_ON(mrq
->data
->blocks
* mrq
->data
->blksz
>
278 #ifdef CONFIG_MMC_DEBUG
280 for_each_sg(mrq
->data
->sg
, sg
, mrq
->data
->sg_len
, i
)
282 BUG_ON(sz
!= mrq
->data
->blocks
* mrq
->data
->blksz
);
285 mrq
->cmd
->data
= mrq
->data
;
286 mrq
->data
->error
= 0;
287 mrq
->data
->mrq
= mrq
;
289 mrq
->data
->stop
= mrq
->stop
;
290 mrq
->stop
->error
= 0;
291 mrq
->stop
->mrq
= mrq
;
294 led_trigger_event(host
->led
, LED_FULL
);
295 __mmc_start_request(host
, mrq
);
301 * mmc_start_bkops - start BKOPS for supported cards
302 * @card: MMC card to start BKOPS
303 * @form_exception: A flag to indicate if this function was
304 * called due to an exception raised by the card
306 * Start background operations whenever requested.
307 * When the urgent BKOPS bit is set in a R1 command response
308 * then background operations should be started immediately.
310 void mmc_start_bkops(struct mmc_card
*card
, bool from_exception
)
314 bool use_busy_signal
;
318 if (!card
->ext_csd
.man_bkops_en
|| mmc_card_doing_bkops(card
))
321 err
= mmc_read_bkops_status(card
);
323 pr_err("%s: Failed to read bkops status: %d\n",
324 mmc_hostname(card
->host
), err
);
328 if (!card
->ext_csd
.raw_bkops_status
)
331 if (card
->ext_csd
.raw_bkops_status
< EXT_CSD_BKOPS_LEVEL_2
&&
335 mmc_claim_host(card
->host
);
336 if (card
->ext_csd
.raw_bkops_status
>= EXT_CSD_BKOPS_LEVEL_2
) {
337 timeout
= MMC_BKOPS_MAX_TIMEOUT
;
338 use_busy_signal
= true;
341 use_busy_signal
= false;
344 mmc_retune_hold(card
->host
);
346 err
= __mmc_switch(card
, EXT_CSD_CMD_SET_NORMAL
,
347 EXT_CSD_BKOPS_START
, 1, timeout
,
348 use_busy_signal
, true, false);
350 pr_warn("%s: Error %d starting bkops\n",
351 mmc_hostname(card
->host
), err
);
352 mmc_retune_release(card
->host
);
357 * For urgent bkops status (LEVEL_2 and more)
358 * bkops executed synchronously, otherwise
359 * the operation is in progress
361 if (!use_busy_signal
)
362 mmc_card_set_doing_bkops(card
);
364 mmc_retune_release(card
->host
);
366 mmc_release_host(card
->host
);
368 EXPORT_SYMBOL(mmc_start_bkops
);
371 * mmc_wait_data_done() - done callback for data request
372 * @mrq: done data request
374 * Wakes up mmc context, passed as a callback to host controller driver
376 static void mmc_wait_data_done(struct mmc_request
*mrq
)
378 struct mmc_context_info
*context_info
= &mrq
->host
->context_info
;
380 context_info
->is_done_rcv
= true;
381 wake_up_interruptible(&context_info
->wait
);
384 static void mmc_wait_done(struct mmc_request
*mrq
)
386 complete(&mrq
->completion
);
390 *__mmc_start_data_req() - starts data request
391 * @host: MMC host to start the request
392 * @mrq: data request to start
394 * Sets the done callback to be called when request is completed by the card.
395 * Starts data mmc request execution
397 static int __mmc_start_data_req(struct mmc_host
*host
, struct mmc_request
*mrq
)
401 mrq
->done
= mmc_wait_data_done
;
404 err
= mmc_start_request(host
, mrq
);
406 mrq
->cmd
->error
= err
;
407 mmc_wait_data_done(mrq
);
413 static int __mmc_start_req(struct mmc_host
*host
, struct mmc_request
*mrq
)
417 init_completion(&mrq
->completion
);
418 mrq
->done
= mmc_wait_done
;
420 err
= mmc_start_request(host
, mrq
);
422 mrq
->cmd
->error
= err
;
423 complete(&mrq
->completion
);
430 * mmc_wait_for_data_req_done() - wait for request completed
431 * @host: MMC host to prepare the command.
432 * @mrq: MMC request to wait for
434 * Blocks MMC context till host controller will ack end of data request
435 * execution or new request notification arrives from the block layer.
436 * Handles command retries.
438 * Returns enum mmc_blk_status after checking errors.
440 static int mmc_wait_for_data_req_done(struct mmc_host
*host
,
441 struct mmc_request
*mrq
,
442 struct mmc_async_req
*next_req
)
444 struct mmc_command
*cmd
;
445 struct mmc_context_info
*context_info
= &host
->context_info
;
450 wait_event_interruptible(context_info
->wait
,
451 (context_info
->is_done_rcv
||
452 context_info
->is_new_req
));
453 spin_lock_irqsave(&context_info
->lock
, flags
);
454 context_info
->is_waiting_last_req
= false;
455 spin_unlock_irqrestore(&context_info
->lock
, flags
);
456 if (context_info
->is_done_rcv
) {
457 context_info
->is_done_rcv
= false;
458 context_info
->is_new_req
= false;
461 if (!cmd
->error
|| !cmd
->retries
||
462 mmc_card_removed(host
->card
)) {
463 err
= host
->areq
->err_check(host
->card
,
465 break; /* return err */
467 mmc_retune_recheck(host
);
468 pr_info("%s: req failed (CMD%u): %d, retrying...\n",
470 cmd
->opcode
, cmd
->error
);
473 __mmc_start_request(host
, mrq
);
474 continue; /* wait for done/new event again */
476 } else if (context_info
->is_new_req
) {
477 context_info
->is_new_req
= false;
479 return MMC_BLK_NEW_REQUEST
;
482 mmc_retune_release(host
);
486 static void mmc_wait_for_req_done(struct mmc_host
*host
,
487 struct mmc_request
*mrq
)
489 struct mmc_command
*cmd
;
492 wait_for_completion(&mrq
->completion
);
497 * If host has timed out waiting for the sanitize
498 * to complete, card might be still in programming state
499 * so let's try to bring the card out of programming
502 if (cmd
->sanitize_busy
&& cmd
->error
== -ETIMEDOUT
) {
503 if (!mmc_interrupt_hpi(host
->card
)) {
504 pr_warn("%s: %s: Interrupted sanitize\n",
505 mmc_hostname(host
), __func__
);
509 pr_err("%s: %s: Failed to interrupt sanitize\n",
510 mmc_hostname(host
), __func__
);
513 if (!cmd
->error
|| !cmd
->retries
||
514 mmc_card_removed(host
->card
))
517 mmc_retune_recheck(host
);
519 pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
520 mmc_hostname(host
), cmd
->opcode
, cmd
->error
);
523 __mmc_start_request(host
, mrq
);
526 mmc_retune_release(host
);
530 * mmc_pre_req - Prepare for a new request
531 * @host: MMC host to prepare command
532 * @mrq: MMC request to prepare for
533 * @is_first_req: true if there is no previous started request
534 * that may run in parellel to this call, otherwise false
536 * mmc_pre_req() is called in prior to mmc_start_req() to let
537 * host prepare for the new request. Preparation of a request may be
538 * performed while another request is running on the host.
540 static void mmc_pre_req(struct mmc_host
*host
, struct mmc_request
*mrq
,
543 if (host
->ops
->pre_req
)
544 host
->ops
->pre_req(host
, mrq
, is_first_req
);
548 * mmc_post_req - Post process a completed request
549 * @host: MMC host to post process command
550 * @mrq: MMC request to post process for
551 * @err: Error, if non zero, clean up any resources made in pre_req
553 * Let the host post process a completed request. Post processing of
554 * a request may be performed while another reuqest is running.
556 static void mmc_post_req(struct mmc_host
*host
, struct mmc_request
*mrq
,
559 if (host
->ops
->post_req
)
560 host
->ops
->post_req(host
, mrq
, err
);
564 * mmc_start_req - start a non-blocking request
565 * @host: MMC host to start command
566 * @areq: async request to start
567 * @error: out parameter returns 0 for success, otherwise non zero
569 * Start a new MMC custom command request for a host.
570 * If there is on ongoing async request wait for completion
571 * of that request and start the new one and return.
572 * Does not wait for the new request to complete.
574 * Returns the completed request, NULL in case of none completed.
575 * Wait for the an ongoing request (previoulsy started) to complete and
576 * return the completed request. If there is no ongoing request, NULL
577 * is returned without waiting. NULL is not an error condition.
579 struct mmc_async_req
*mmc_start_req(struct mmc_host
*host
,
580 struct mmc_async_req
*areq
, int *error
)
584 struct mmc_async_req
*data
= host
->areq
;
586 /* Prepare a new request */
588 mmc_pre_req(host
, areq
->mrq
, !host
->areq
);
591 err
= mmc_wait_for_data_req_done(host
, host
->areq
->mrq
, areq
);
592 if (err
== MMC_BLK_NEW_REQUEST
) {
596 * The previous request was not completed,
602 * Check BKOPS urgency for each R1 response
604 if (host
->card
&& mmc_card_mmc(host
->card
) &&
605 ((mmc_resp_type(host
->areq
->mrq
->cmd
) == MMC_RSP_R1
) ||
606 (mmc_resp_type(host
->areq
->mrq
->cmd
) == MMC_RSP_R1B
)) &&
607 (host
->areq
->mrq
->cmd
->resp
[0] & R1_EXCEPTION_EVENT
)) {
609 /* Cancel the prepared request */
611 mmc_post_req(host
, areq
->mrq
, -EINVAL
);
613 mmc_start_bkops(host
->card
, true);
615 /* prepare the request again */
617 mmc_pre_req(host
, areq
->mrq
, !host
->areq
);
622 start_err
= __mmc_start_data_req(host
, areq
->mrq
);
625 mmc_post_req(host
, host
->areq
->mrq
, 0);
627 /* Cancel a prepared request if it was not started. */
628 if ((err
|| start_err
) && areq
)
629 mmc_post_req(host
, areq
->mrq
, -EINVAL
);
640 EXPORT_SYMBOL(mmc_start_req
);
643 * mmc_wait_for_req - start a request and wait for completion
644 * @host: MMC host to start command
645 * @mrq: MMC request to start
647 * Start a new MMC custom command request for a host, and wait
648 * for the command to complete. Does not attempt to parse the
651 void mmc_wait_for_req(struct mmc_host
*host
, struct mmc_request
*mrq
)
653 __mmc_start_req(host
, mrq
);
654 mmc_wait_for_req_done(host
, mrq
);
656 EXPORT_SYMBOL(mmc_wait_for_req
);
659 * mmc_interrupt_hpi - Issue for High priority Interrupt
660 * @card: the MMC card associated with the HPI transfer
662 * Issued High Priority Interrupt, and check for card status
663 * until out-of prg-state.
665 int mmc_interrupt_hpi(struct mmc_card
*card
)
669 unsigned long prg_wait
;
673 if (!card
->ext_csd
.hpi_en
) {
674 pr_info("%s: HPI enable bit unset\n", mmc_hostname(card
->host
));
678 mmc_claim_host(card
->host
);
679 err
= mmc_send_status(card
, &status
);
681 pr_err("%s: Get card status fail\n", mmc_hostname(card
->host
));
685 switch (R1_CURRENT_STATE(status
)) {
691 * In idle and transfer states, HPI is not needed and the caller
692 * can issue the next intended command immediately
698 /* In all other states, it's illegal to issue HPI */
699 pr_debug("%s: HPI cannot be sent. Card state=%d\n",
700 mmc_hostname(card
->host
), R1_CURRENT_STATE(status
));
705 err
= mmc_send_hpi_cmd(card
, &status
);
709 prg_wait
= jiffies
+ msecs_to_jiffies(card
->ext_csd
.out_of_int_time
);
711 err
= mmc_send_status(card
, &status
);
713 if (!err
&& R1_CURRENT_STATE(status
) == R1_STATE_TRAN
)
715 if (time_after(jiffies
, prg_wait
))
720 mmc_release_host(card
->host
);
723 EXPORT_SYMBOL(mmc_interrupt_hpi
);
726 * mmc_wait_for_cmd - start a command and wait for completion
727 * @host: MMC host to start command
728 * @cmd: MMC command to start
729 * @retries: maximum number of retries
731 * Start a new MMC command for a host, and wait for the command
732 * to complete. Return any error that occurred while the command
733 * was executing. Do not attempt to parse the response.
735 int mmc_wait_for_cmd(struct mmc_host
*host
, struct mmc_command
*cmd
, int retries
)
737 struct mmc_request mrq
= {NULL
};
739 WARN_ON(!host
->claimed
);
741 memset(cmd
->resp
, 0, sizeof(cmd
->resp
));
742 cmd
->retries
= retries
;
747 mmc_wait_for_req(host
, &mrq
);
752 EXPORT_SYMBOL(mmc_wait_for_cmd
);
755 * mmc_stop_bkops - stop ongoing BKOPS
756 * @card: MMC card to check BKOPS
758 * Send HPI command to stop ongoing background operations to
759 * allow rapid servicing of foreground operations, e.g. read/
760 * writes. Wait until the card comes out of the programming state
761 * to avoid errors in servicing read/write requests.
763 int mmc_stop_bkops(struct mmc_card
*card
)
768 err
= mmc_interrupt_hpi(card
);
771 * If err is EINVAL, we can't issue an HPI.
772 * It should complete the BKOPS.
774 if (!err
|| (err
== -EINVAL
)) {
775 mmc_card_clr_doing_bkops(card
);
776 mmc_retune_release(card
->host
);
782 EXPORT_SYMBOL(mmc_stop_bkops
);
784 int mmc_read_bkops_status(struct mmc_card
*card
)
789 mmc_claim_host(card
->host
);
790 err
= mmc_get_ext_csd(card
, &ext_csd
);
791 mmc_release_host(card
->host
);
795 card
->ext_csd
.raw_bkops_status
= ext_csd
[EXT_CSD_BKOPS_STATUS
];
796 card
->ext_csd
.raw_exception_status
= ext_csd
[EXT_CSD_EXP_EVENTS_STATUS
];
800 EXPORT_SYMBOL(mmc_read_bkops_status
);
803 * mmc_set_data_timeout - set the timeout for a data command
804 * @data: data phase for command
805 * @card: the MMC card associated with the data transfer
807 * Computes the data timeout parameters according to the
808 * correct algorithm given the card type.
810 void mmc_set_data_timeout(struct mmc_data
*data
, const struct mmc_card
*card
)
815 * SDIO cards only define an upper 1 s limit on access.
817 if (mmc_card_sdio(card
)) {
818 data
->timeout_ns
= 1000000000;
819 data
->timeout_clks
= 0;
824 * SD cards use a 100 multiplier rather than 10
826 mult
= mmc_card_sd(card
) ? 100 : 10;
829 * Scale up the multiplier (and therefore the timeout) by
830 * the r2w factor for writes.
832 if (data
->flags
& MMC_DATA_WRITE
)
833 mult
<<= card
->csd
.r2w_factor
;
835 data
->timeout_ns
= card
->csd
.tacc_ns
* mult
;
836 data
->timeout_clks
= card
->csd
.tacc_clks
* mult
;
839 * SD cards also have an upper limit on the timeout.
841 if (mmc_card_sd(card
)) {
842 unsigned int timeout_us
, limit_us
;
844 timeout_us
= data
->timeout_ns
/ 1000;
845 if (card
->host
->ios
.clock
)
846 timeout_us
+= data
->timeout_clks
* 1000 /
847 (card
->host
->ios
.clock
/ 1000);
849 if (data
->flags
& MMC_DATA_WRITE
)
851 * The MMC spec "It is strongly recommended
852 * for hosts to implement more than 500ms
853 * timeout value even if the card indicates
854 * the 250ms maximum busy length." Even the
855 * previous value of 300ms is known to be
856 * insufficient for some cards.
863 * SDHC cards always use these fixed values.
865 if (timeout_us
> limit_us
|| mmc_card_blockaddr(card
)) {
866 data
->timeout_ns
= limit_us
* 1000;
867 data
->timeout_clks
= 0;
870 /* assign limit value if invalid */
872 data
->timeout_ns
= limit_us
* 1000;
876 * Some cards require longer data read timeout than indicated in CSD.
877 * Address this by setting the read timeout to a "reasonably high"
878 * value. For the cards tested, 600ms has proven enough. If necessary,
879 * this value can be increased if other problematic cards require this.
881 if (mmc_card_long_read_time(card
) && data
->flags
& MMC_DATA_READ
) {
882 data
->timeout_ns
= 600000000;
883 data
->timeout_clks
= 0;
887 * Some cards need very high timeouts if driven in SPI mode.
888 * The worst observed timeout was 900ms after writing a
889 * continuous stream of data until the internal logic
892 if (mmc_host_is_spi(card
->host
)) {
893 if (data
->flags
& MMC_DATA_WRITE
) {
894 if (data
->timeout_ns
< 1000000000)
895 data
->timeout_ns
= 1000000000; /* 1s */
897 if (data
->timeout_ns
< 100000000)
898 data
->timeout_ns
= 100000000; /* 100ms */
902 EXPORT_SYMBOL(mmc_set_data_timeout
);
905 * mmc_align_data_size - pads a transfer size to a more optimal value
906 * @card: the MMC card associated with the data transfer
907 * @sz: original transfer size
909 * Pads the original data size with a number of extra bytes in
910 * order to avoid controller bugs and/or performance hits
911 * (e.g. some controllers revert to PIO for certain sizes).
913 * Returns the improved size, which might be unmodified.
915 * Note that this function is only relevant when issuing a
916 * single scatter gather entry.
918 unsigned int mmc_align_data_size(struct mmc_card
*card
, unsigned int sz
)
921 * FIXME: We don't have a system for the controller to tell
922 * the core about its problems yet, so for now we just 32-bit
925 sz
= ((sz
+ 3) / 4) * 4;
929 EXPORT_SYMBOL(mmc_align_data_size
);
932 * __mmc_claim_host - exclusively claim a host
933 * @host: mmc host to claim
934 * @abort: whether or not the operation should be aborted
936 * Claim a host for a set of operations. If @abort is non null and
937 * dereference a non-zero value then this will return prematurely with
938 * that non-zero value without acquiring the lock. Returns zero
939 * with the lock held otherwise.
941 int __mmc_claim_host(struct mmc_host
*host
, atomic_t
*abort
)
943 DECLARE_WAITQUEUE(wait
, current
);
950 add_wait_queue(&host
->wq
, &wait
);
951 spin_lock_irqsave(&host
->lock
, flags
);
953 set_current_state(TASK_UNINTERRUPTIBLE
);
954 stop
= abort
? atomic_read(abort
) : 0;
955 if (stop
|| !host
->claimed
|| host
->claimer
== current
)
957 spin_unlock_irqrestore(&host
->lock
, flags
);
959 spin_lock_irqsave(&host
->lock
, flags
);
961 set_current_state(TASK_RUNNING
);
964 host
->claimer
= current
;
965 host
->claim_cnt
+= 1;
966 if (host
->claim_cnt
== 1)
970 spin_unlock_irqrestore(&host
->lock
, flags
);
971 remove_wait_queue(&host
->wq
, &wait
);
974 pm_runtime_get_sync(mmc_dev(host
));
978 EXPORT_SYMBOL(__mmc_claim_host
);
981 * mmc_release_host - release a host
982 * @host: mmc host to release
984 * Release a MMC host, allowing others to claim the host
985 * for their operations.
987 void mmc_release_host(struct mmc_host
*host
)
991 WARN_ON(!host
->claimed
);
993 spin_lock_irqsave(&host
->lock
, flags
);
994 if (--host
->claim_cnt
) {
995 /* Release for nested claim */
996 spin_unlock_irqrestore(&host
->lock
, flags
);
999 host
->claimer
= NULL
;
1000 spin_unlock_irqrestore(&host
->lock
, flags
);
1002 pm_runtime_mark_last_busy(mmc_dev(host
));
1003 pm_runtime_put_autosuspend(mmc_dev(host
));
1006 EXPORT_SYMBOL(mmc_release_host
);
1009 * This is a helper function, which fetches a runtime pm reference for the
1010 * card device and also claims the host.
1012 void mmc_get_card(struct mmc_card
*card
)
1014 pm_runtime_get_sync(&card
->dev
);
1015 mmc_claim_host(card
->host
);
1017 EXPORT_SYMBOL(mmc_get_card
);
1020 * This is a helper function, which releases the host and drops the runtime
1021 * pm reference for the card device.
1023 void mmc_put_card(struct mmc_card
*card
)
1025 mmc_release_host(card
->host
);
1026 pm_runtime_mark_last_busy(&card
->dev
);
1027 pm_runtime_put_autosuspend(&card
->dev
);
1029 EXPORT_SYMBOL(mmc_put_card
);
1032 * Internal function that does the actual ios call to the host driver,
1033 * optionally printing some debug output.
1035 static inline void mmc_set_ios(struct mmc_host
*host
)
1037 struct mmc_ios
*ios
= &host
->ios
;
1039 pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u "
1040 "width %u timing %u\n",
1041 mmc_hostname(host
), ios
->clock
, ios
->bus_mode
,
1042 ios
->power_mode
, ios
->chip_select
, ios
->vdd
,
1043 1 << ios
->bus_width
, ios
->timing
);
1045 host
->ops
->set_ios(host
, ios
);
1049 * Control chip select pin on a host.
1051 void mmc_set_chip_select(struct mmc_host
*host
, int mode
)
1053 host
->ios
.chip_select
= mode
;
1058 * Sets the host clock to the highest possible frequency that
1061 void mmc_set_clock(struct mmc_host
*host
, unsigned int hz
)
1063 WARN_ON(hz
&& hz
< host
->f_min
);
1065 if (hz
> host
->f_max
)
1068 host
->ios
.clock
= hz
;
1072 int mmc_execute_tuning(struct mmc_card
*card
)
1074 struct mmc_host
*host
= card
->host
;
1078 if (!host
->ops
->execute_tuning
)
1081 if (mmc_card_mmc(card
))
1082 opcode
= MMC_SEND_TUNING_BLOCK_HS200
;
1084 opcode
= MMC_SEND_TUNING_BLOCK
;
1086 err
= host
->ops
->execute_tuning(host
, opcode
);
1089 pr_err("%s: tuning execution failed: %d\n",
1090 mmc_hostname(host
), err
);
1092 mmc_retune_enable(host
);
1098 * Change the bus mode (open drain/push-pull) of a host.
1100 void mmc_set_bus_mode(struct mmc_host
*host
, unsigned int mode
)
1102 host
->ios
.bus_mode
= mode
;
1107 * Change data bus width of a host.
1109 void mmc_set_bus_width(struct mmc_host
*host
, unsigned int width
)
1111 host
->ios
.bus_width
= width
;
1116 * Set initial state after a power cycle or a hw_reset.
1118 void mmc_set_initial_state(struct mmc_host
*host
)
1120 mmc_retune_disable(host
);
1122 if (mmc_host_is_spi(host
))
1123 host
->ios
.chip_select
= MMC_CS_HIGH
;
1125 host
->ios
.chip_select
= MMC_CS_DONTCARE
;
1126 host
->ios
.bus_mode
= MMC_BUSMODE_PUSHPULL
;
1127 host
->ios
.bus_width
= MMC_BUS_WIDTH_1
;
1128 host
->ios
.timing
= MMC_TIMING_LEGACY
;
1129 host
->ios
.drv_type
= 0;
1135 * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number
1136 * @vdd: voltage (mV)
1137 * @low_bits: prefer low bits in boundary cases
1139 * This function returns the OCR bit number according to the provided @vdd
1140 * value. If conversion is not possible a negative errno value returned.
1142 * Depending on the @low_bits flag the function prefers low or high OCR bits
1143 * on boundary voltages. For example,
1144 * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33);
1145 * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34);
1147 * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21).
1149 static int mmc_vdd_to_ocrbitnum(int vdd
, bool low_bits
)
1151 const int max_bit
= ilog2(MMC_VDD_35_36
);
1154 if (vdd
< 1650 || vdd
> 3600)
1157 if (vdd
>= 1650 && vdd
<= 1950)
1158 return ilog2(MMC_VDD_165_195
);
1163 /* Base 2000 mV, step 100 mV, bit's base 8. */
1164 bit
= (vdd
- 2000) / 100 + 8;
1171 * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask
1172 * @vdd_min: minimum voltage value (mV)
1173 * @vdd_max: maximum voltage value (mV)
1175 * This function returns the OCR mask bits according to the provided @vdd_min
1176 * and @vdd_max values. If conversion is not possible the function returns 0.
1178 * Notes wrt boundary cases:
1179 * This function sets the OCR bits for all boundary voltages, for example
1180 * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 |
1181 * MMC_VDD_34_35 mask.
1183 u32
mmc_vddrange_to_ocrmask(int vdd_min
, int vdd_max
)
1187 if (vdd_max
< vdd_min
)
1190 /* Prefer high bits for the boundary vdd_max values. */
1191 vdd_max
= mmc_vdd_to_ocrbitnum(vdd_max
, false);
1195 /* Prefer low bits for the boundary vdd_min values. */
1196 vdd_min
= mmc_vdd_to_ocrbitnum(vdd_min
, true);
1200 /* Fill the mask, from max bit to min bit. */
1201 while (vdd_max
>= vdd_min
)
1202 mask
|= 1 << vdd_max
--;
1206 EXPORT_SYMBOL(mmc_vddrange_to_ocrmask
);
1211 * mmc_of_parse_voltage - return mask of supported voltages
1212 * @np: The device node need to be parsed.
1213 * @mask: mask of voltages available for MMC/SD/SDIO
1215 * Parse the "voltage-ranges" DT property, returning zero if it is not
1216 * found, negative errno if the voltage-range specification is invalid,
1217 * or one if the voltage-range is specified and successfully parsed.
1219 int mmc_of_parse_voltage(struct device_node
*np
, u32
*mask
)
1221 const u32
*voltage_ranges
;
1224 voltage_ranges
= of_get_property(np
, "voltage-ranges", &num_ranges
);
1225 num_ranges
= num_ranges
/ sizeof(*voltage_ranges
) / 2;
1226 if (!voltage_ranges
) {
1227 pr_debug("%s: voltage-ranges unspecified\n", np
->full_name
);
1231 pr_err("%s: voltage-ranges empty\n", np
->full_name
);
1235 for (i
= 0; i
< num_ranges
; i
++) {
1236 const int j
= i
* 2;
1239 ocr_mask
= mmc_vddrange_to_ocrmask(
1240 be32_to_cpu(voltage_ranges
[j
]),
1241 be32_to_cpu(voltage_ranges
[j
+ 1]));
1243 pr_err("%s: voltage-range #%d is invalid\n",
1252 EXPORT_SYMBOL(mmc_of_parse_voltage
);
1254 #endif /* CONFIG_OF */
1256 static int mmc_of_get_func_num(struct device_node
*node
)
1261 ret
= of_property_read_u32(node
, "reg", ®
);
1268 struct device_node
*mmc_of_find_child_device(struct mmc_host
*host
,
1271 struct device_node
*node
;
1273 if (!host
->parent
|| !host
->parent
->of_node
)
1276 for_each_child_of_node(host
->parent
->of_node
, node
) {
1277 if (mmc_of_get_func_num(node
) == func_num
)
1284 #ifdef CONFIG_REGULATOR
1287 * mmc_ocrbitnum_to_vdd - Convert a OCR bit number to its voltage
1288 * @vdd_bit: OCR bit number
1289 * @min_uV: minimum voltage value (mV)
1290 * @max_uV: maximum voltage value (mV)
1292 * This function returns the voltage range according to the provided OCR
1293 * bit number. If conversion is not possible a negative errno value returned.
1295 static int mmc_ocrbitnum_to_vdd(int vdd_bit
, int *min_uV
, int *max_uV
)
1303 * REVISIT mmc_vddrange_to_ocrmask() may have set some
1304 * bits this regulator doesn't quite support ... don't
1305 * be too picky, most cards and regulators are OK with
1306 * a 0.1V range goof (it's a small error percentage).
1308 tmp
= vdd_bit
- ilog2(MMC_VDD_165_195
);
1310 *min_uV
= 1650 * 1000;
1311 *max_uV
= 1950 * 1000;
1313 *min_uV
= 1900 * 1000 + tmp
* 100 * 1000;
1314 *max_uV
= *min_uV
+ 100 * 1000;
1321 * mmc_regulator_get_ocrmask - return mask of supported voltages
1322 * @supply: regulator to use
1324 * This returns either a negative errno, or a mask of voltages that
1325 * can be provided to MMC/SD/SDIO devices using the specified voltage
1326 * regulator. This would normally be called before registering the
1329 int mmc_regulator_get_ocrmask(struct regulator
*supply
)
1337 count
= regulator_count_voltages(supply
);
1341 for (i
= 0; i
< count
; i
++) {
1342 vdd_uV
= regulator_list_voltage(supply
, i
);
1346 vdd_mV
= vdd_uV
/ 1000;
1347 result
|= mmc_vddrange_to_ocrmask(vdd_mV
, vdd_mV
);
1351 vdd_uV
= regulator_get_voltage(supply
);
1355 vdd_mV
= vdd_uV
/ 1000;
1356 result
= mmc_vddrange_to_ocrmask(vdd_mV
, vdd_mV
);
1361 EXPORT_SYMBOL_GPL(mmc_regulator_get_ocrmask
);
1364 * mmc_regulator_set_ocr - set regulator to match host->ios voltage
1365 * @mmc: the host to regulate
1366 * @supply: regulator to use
1367 * @vdd_bit: zero for power off, else a bit number (host->ios.vdd)
1369 * Returns zero on success, else negative errno.
1371 * MMC host drivers may use this to enable or disable a regulator using
1372 * a particular supply voltage. This would normally be called from the
1375 int mmc_regulator_set_ocr(struct mmc_host
*mmc
,
1376 struct regulator
*supply
,
1377 unsigned short vdd_bit
)
1383 mmc_ocrbitnum_to_vdd(vdd_bit
, &min_uV
, &max_uV
);
1385 result
= regulator_set_voltage(supply
, min_uV
, max_uV
);
1386 if (result
== 0 && !mmc
->regulator_enabled
) {
1387 result
= regulator_enable(supply
);
1389 mmc
->regulator_enabled
= true;
1391 } else if (mmc
->regulator_enabled
) {
1392 result
= regulator_disable(supply
);
1394 mmc
->regulator_enabled
= false;
1398 dev_err(mmc_dev(mmc
),
1399 "could not set regulator OCR (%d)\n", result
);
1402 EXPORT_SYMBOL_GPL(mmc_regulator_set_ocr
);
1404 static int mmc_regulator_set_voltage_if_supported(struct regulator
*regulator
,
1405 int min_uV
, int target_uV
,
1409 * Check if supported first to avoid errors since we may try several
1410 * signal levels during power up and don't want to show errors.
1412 if (!regulator_is_supported_voltage(regulator
, min_uV
, max_uV
))
1415 return regulator_set_voltage_triplet(regulator
, min_uV
, target_uV
,
1420 * mmc_regulator_set_vqmmc - Set VQMMC as per the ios
1422 * For 3.3V signaling, we try to match VQMMC to VMMC as closely as possible.
1423 * That will match the behavior of old boards where VQMMC and VMMC were supplied
1424 * by the same supply. The Bus Operating conditions for 3.3V signaling in the
1425 * SD card spec also define VQMMC in terms of VMMC.
1426 * If this is not possible we'll try the full 2.7-3.6V of the spec.
1428 * For 1.2V and 1.8V signaling we'll try to get as close as possible to the
1429 * requested voltage. This is definitely a good idea for UHS where there's a
1430 * separate regulator on the card that's trying to make 1.8V and it's best if
1433 * This function is expected to be used by a controller's
1434 * start_signal_voltage_switch() function.
1436 int mmc_regulator_set_vqmmc(struct mmc_host
*mmc
, struct mmc_ios
*ios
)
1438 struct device
*dev
= mmc_dev(mmc
);
1439 int ret
, volt
, min_uV
, max_uV
;
1441 /* If no vqmmc supply then we can't change the voltage */
1442 if (IS_ERR(mmc
->supply
.vqmmc
))
1445 switch (ios
->signal_voltage
) {
1446 case MMC_SIGNAL_VOLTAGE_120
:
1447 return mmc_regulator_set_voltage_if_supported(mmc
->supply
.vqmmc
,
1448 1100000, 1200000, 1300000);
1449 case MMC_SIGNAL_VOLTAGE_180
:
1450 return mmc_regulator_set_voltage_if_supported(mmc
->supply
.vqmmc
,
1451 1700000, 1800000, 1950000);
1452 case MMC_SIGNAL_VOLTAGE_330
:
1453 ret
= mmc_ocrbitnum_to_vdd(mmc
->ios
.vdd
, &volt
, &max_uV
);
1457 dev_dbg(dev
, "%s: found vmmc voltage range of %d-%duV\n",
1458 __func__
, volt
, max_uV
);
1460 min_uV
= max(volt
- 300000, 2700000);
1461 max_uV
= min(max_uV
+ 200000, 3600000);
1464 * Due to a limitation in the current implementation of
1465 * regulator_set_voltage_triplet() which is taking the lowest
1466 * voltage possible if below the target, search for a suitable
1467 * voltage in two steps and try to stay close to vmmc
1468 * with a 0.3V tolerance at first.
1470 if (!mmc_regulator_set_voltage_if_supported(mmc
->supply
.vqmmc
,
1471 min_uV
, volt
, max_uV
))
1474 return mmc_regulator_set_voltage_if_supported(mmc
->supply
.vqmmc
,
1475 2700000, volt
, 3600000);
1480 EXPORT_SYMBOL_GPL(mmc_regulator_set_vqmmc
);
1482 #endif /* CONFIG_REGULATOR */
1484 int mmc_regulator_get_supply(struct mmc_host
*mmc
)
1486 struct device
*dev
= mmc_dev(mmc
);
1489 mmc
->supply
.vmmc
= devm_regulator_get_optional(dev
, "vmmc");
1490 mmc
->supply
.vqmmc
= devm_regulator_get_optional(dev
, "vqmmc");
1492 if (IS_ERR(mmc
->supply
.vmmc
)) {
1493 if (PTR_ERR(mmc
->supply
.vmmc
) == -EPROBE_DEFER
)
1494 return -EPROBE_DEFER
;
1495 dev_dbg(dev
, "No vmmc regulator found\n");
1497 ret
= mmc_regulator_get_ocrmask(mmc
->supply
.vmmc
);
1499 mmc
->ocr_avail
= ret
;
1501 dev_warn(dev
, "Failed getting OCR mask: %d\n", ret
);
1504 if (IS_ERR(mmc
->supply
.vqmmc
)) {
1505 if (PTR_ERR(mmc
->supply
.vqmmc
) == -EPROBE_DEFER
)
1506 return -EPROBE_DEFER
;
1507 dev_dbg(dev
, "No vqmmc regulator found\n");
1512 EXPORT_SYMBOL_GPL(mmc_regulator_get_supply
);
1515 * Mask off any voltages we don't support and select
1516 * the lowest voltage
1518 u32
mmc_select_voltage(struct mmc_host
*host
, u32 ocr
)
1523 * Sanity check the voltages that the card claims to
1527 dev_warn(mmc_dev(host
),
1528 "card claims to support voltages below defined range\n");
1532 ocr
&= host
->ocr_avail
;
1534 dev_warn(mmc_dev(host
), "no support for card's volts\n");
1538 if (host
->caps2
& MMC_CAP2_FULL_PWR_CYCLE
) {
1541 mmc_power_cycle(host
, ocr
);
1545 if (bit
!= host
->ios
.vdd
)
1546 dev_warn(mmc_dev(host
), "exceeding card's volts\n");
1552 int __mmc_set_signal_voltage(struct mmc_host
*host
, int signal_voltage
)
1555 int old_signal_voltage
= host
->ios
.signal_voltage
;
1557 host
->ios
.signal_voltage
= signal_voltage
;
1558 if (host
->ops
->start_signal_voltage_switch
)
1559 err
= host
->ops
->start_signal_voltage_switch(host
, &host
->ios
);
1562 host
->ios
.signal_voltage
= old_signal_voltage
;
1568 int mmc_set_signal_voltage(struct mmc_host
*host
, int signal_voltage
, u32 ocr
)
1570 struct mmc_command cmd
= {0};
1577 * Send CMD11 only if the request is to switch the card to
1580 if (signal_voltage
== MMC_SIGNAL_VOLTAGE_330
)
1581 return __mmc_set_signal_voltage(host
, signal_voltage
);
1584 * If we cannot switch voltages, return failure so the caller
1585 * can continue without UHS mode
1587 if (!host
->ops
->start_signal_voltage_switch
)
1589 if (!host
->ops
->card_busy
)
1590 pr_warn("%s: cannot verify signal voltage switch\n",
1591 mmc_hostname(host
));
1593 cmd
.opcode
= SD_SWITCH_VOLTAGE
;
1595 cmd
.flags
= MMC_RSP_R1
| MMC_CMD_AC
;
1597 err
= mmc_wait_for_cmd(host
, &cmd
, 0);
1601 if (!mmc_host_is_spi(host
) && (cmd
.resp
[0] & R1_ERROR
))
1605 * The card should drive cmd and dat[0:3] low immediately
1606 * after the response of cmd11, but wait 1 ms to be sure
1609 if (host
->ops
->card_busy
&& !host
->ops
->card_busy(host
)) {
1614 * During a signal voltage level switch, the clock must be gated
1615 * for 5 ms according to the SD spec
1617 clock
= host
->ios
.clock
;
1618 host
->ios
.clock
= 0;
1621 if (__mmc_set_signal_voltage(host
, signal_voltage
)) {
1623 * Voltages may not have been switched, but we've already
1624 * sent CMD11, so a power cycle is required anyway
1630 /* Keep clock gated for at least 10 ms, though spec only says 5 ms */
1632 host
->ios
.clock
= clock
;
1635 /* Wait for at least 1 ms according to spec */
1639 * Failure to switch is indicated by the card holding
1642 if (host
->ops
->card_busy
&& host
->ops
->card_busy(host
))
1647 pr_debug("%s: Signal voltage switch failed, "
1648 "power cycling card\n", mmc_hostname(host
));
1649 mmc_power_cycle(host
, ocr
);
1656 * Select timing parameters for host.
1658 void mmc_set_timing(struct mmc_host
*host
, unsigned int timing
)
1660 host
->ios
.timing
= timing
;
1665 * Select appropriate driver type for host.
1667 void mmc_set_driver_type(struct mmc_host
*host
, unsigned int drv_type
)
1669 host
->ios
.drv_type
= drv_type
;
1673 int mmc_select_drive_strength(struct mmc_card
*card
, unsigned int max_dtr
,
1674 int card_drv_type
, int *drv_type
)
1676 struct mmc_host
*host
= card
->host
;
1677 int host_drv_type
= SD_DRIVER_TYPE_B
;
1681 if (!host
->ops
->select_drive_strength
)
1684 /* Use SD definition of driver strength for hosts */
1685 if (host
->caps
& MMC_CAP_DRIVER_TYPE_A
)
1686 host_drv_type
|= SD_DRIVER_TYPE_A
;
1688 if (host
->caps
& MMC_CAP_DRIVER_TYPE_C
)
1689 host_drv_type
|= SD_DRIVER_TYPE_C
;
1691 if (host
->caps
& MMC_CAP_DRIVER_TYPE_D
)
1692 host_drv_type
|= SD_DRIVER_TYPE_D
;
1695 * The drive strength that the hardware can support
1696 * depends on the board design. Pass the appropriate
1697 * information and let the hardware specific code
1698 * return what is possible given the options
1700 return host
->ops
->select_drive_strength(card
, max_dtr
,
1707 * Apply power to the MMC stack. This is a two-stage process.
1708 * First, we enable power to the card without the clock running.
1709 * We then wait a bit for the power to stabilise. Finally,
1710 * enable the bus drivers and clock to the card.
1712 * We must _NOT_ enable the clock prior to power stablising.
1714 * If a host does all the power sequencing itself, ignore the
1715 * initial MMC_POWER_UP stage.
1717 void mmc_power_up(struct mmc_host
*host
, u32 ocr
)
1719 if (host
->ios
.power_mode
== MMC_POWER_ON
)
1722 mmc_pwrseq_pre_power_on(host
);
1724 host
->ios
.vdd
= fls(ocr
) - 1;
1725 host
->ios
.power_mode
= MMC_POWER_UP
;
1726 /* Set initial state and call mmc_set_ios */
1727 mmc_set_initial_state(host
);
1729 /* Try to set signal voltage to 3.3V but fall back to 1.8v or 1.2v */
1730 if (__mmc_set_signal_voltage(host
, MMC_SIGNAL_VOLTAGE_330
) == 0)
1731 dev_dbg(mmc_dev(host
), "Initial signal voltage of 3.3v\n");
1732 else if (__mmc_set_signal_voltage(host
, MMC_SIGNAL_VOLTAGE_180
) == 0)
1733 dev_dbg(mmc_dev(host
), "Initial signal voltage of 1.8v\n");
1734 else if (__mmc_set_signal_voltage(host
, MMC_SIGNAL_VOLTAGE_120
) == 0)
1735 dev_dbg(mmc_dev(host
), "Initial signal voltage of 1.2v\n");
1738 * This delay should be sufficient to allow the power supply
1739 * to reach the minimum voltage.
1743 mmc_pwrseq_post_power_on(host
);
1745 host
->ios
.clock
= host
->f_init
;
1747 host
->ios
.power_mode
= MMC_POWER_ON
;
1751 * This delay must be at least 74 clock sizes, or 1 ms, or the
1752 * time required to reach a stable voltage.
1757 void mmc_power_off(struct mmc_host
*host
)
1759 if (host
->ios
.power_mode
== MMC_POWER_OFF
)
1762 mmc_pwrseq_power_off(host
);
1764 host
->ios
.clock
= 0;
1767 host
->ios
.power_mode
= MMC_POWER_OFF
;
1768 /* Set initial state and call mmc_set_ios */
1769 mmc_set_initial_state(host
);
1772 * Some configurations, such as the 802.11 SDIO card in the OLPC
1773 * XO-1.5, require a short delay after poweroff before the card
1774 * can be successfully turned on again.
1779 void mmc_power_cycle(struct mmc_host
*host
, u32 ocr
)
1781 mmc_power_off(host
);
1782 /* Wait at least 1 ms according to SD spec */
1784 mmc_power_up(host
, ocr
);
1788 * Cleanup when the last reference to the bus operator is dropped.
1790 static void __mmc_release_bus(struct mmc_host
*host
)
1793 BUG_ON(host
->bus_refs
);
1794 BUG_ON(!host
->bus_dead
);
1796 host
->bus_ops
= NULL
;
1800 * Increase reference count of bus operator
1802 static inline void mmc_bus_get(struct mmc_host
*host
)
1804 unsigned long flags
;
1806 spin_lock_irqsave(&host
->lock
, flags
);
1808 spin_unlock_irqrestore(&host
->lock
, flags
);
1812 * Decrease reference count of bus operator and free it if
1813 * it is the last reference.
1815 static inline void mmc_bus_put(struct mmc_host
*host
)
1817 unsigned long flags
;
1819 spin_lock_irqsave(&host
->lock
, flags
);
1821 if ((host
->bus_refs
== 0) && host
->bus_ops
)
1822 __mmc_release_bus(host
);
1823 spin_unlock_irqrestore(&host
->lock
, flags
);
1827 * Assign a mmc bus handler to a host. Only one bus handler may control a
1828 * host at any given time.
1830 void mmc_attach_bus(struct mmc_host
*host
, const struct mmc_bus_ops
*ops
)
1832 unsigned long flags
;
1837 WARN_ON(!host
->claimed
);
1839 spin_lock_irqsave(&host
->lock
, flags
);
1841 BUG_ON(host
->bus_ops
);
1842 BUG_ON(host
->bus_refs
);
1844 host
->bus_ops
= ops
;
1848 spin_unlock_irqrestore(&host
->lock
, flags
);
1852 * Remove the current bus handler from a host.
1854 void mmc_detach_bus(struct mmc_host
*host
)
1856 unsigned long flags
;
1860 WARN_ON(!host
->claimed
);
1861 WARN_ON(!host
->bus_ops
);
1863 spin_lock_irqsave(&host
->lock
, flags
);
1867 spin_unlock_irqrestore(&host
->lock
, flags
);
1872 static void _mmc_detect_change(struct mmc_host
*host
, unsigned long delay
,
1875 #ifdef CONFIG_MMC_DEBUG
1876 unsigned long flags
;
1877 spin_lock_irqsave(&host
->lock
, flags
);
1878 WARN_ON(host
->removed
);
1879 spin_unlock_irqrestore(&host
->lock
, flags
);
1883 * If the device is configured as wakeup, we prevent a new sleep for
1884 * 5 s to give provision for user space to consume the event.
1886 if (cd_irq
&& !(host
->caps
& MMC_CAP_NEEDS_POLL
) &&
1887 device_can_wakeup(mmc_dev(host
)))
1888 pm_wakeup_event(mmc_dev(host
), 5000);
1890 host
->detect_change
= 1;
1891 mmc_schedule_delayed_work(&host
->detect
, delay
);
1895 * mmc_detect_change - process change of state on a MMC socket
1896 * @host: host which changed state.
1897 * @delay: optional delay to wait before detection (jiffies)
1899 * MMC drivers should call this when they detect a card has been
1900 * inserted or removed. The MMC layer will confirm that any
1901 * present card is still functional, and initialize any newly
1904 void mmc_detect_change(struct mmc_host
*host
, unsigned long delay
)
1906 _mmc_detect_change(host
, delay
, true);
1908 EXPORT_SYMBOL(mmc_detect_change
);
1910 void mmc_init_erase(struct mmc_card
*card
)
1914 if (is_power_of_2(card
->erase_size
))
1915 card
->erase_shift
= ffs(card
->erase_size
) - 1;
1917 card
->erase_shift
= 0;
1920 * It is possible to erase an arbitrarily large area of an SD or MMC
1921 * card. That is not desirable because it can take a long time
1922 * (minutes) potentially delaying more important I/O, and also the
1923 * timeout calculations become increasingly hugely over-estimated.
1924 * Consequently, 'pref_erase' is defined as a guide to limit erases
1925 * to that size and alignment.
1927 * For SD cards that define Allocation Unit size, limit erases to one
1928 * Allocation Unit at a time. For MMC cards that define High Capacity
1929 * Erase Size, whether it is switched on or not, limit to that size.
1930 * Otherwise just have a stab at a good value. For modern cards it
1931 * will end up being 4MiB. Note that if the value is too small, it
1932 * can end up taking longer to erase.
1934 if (mmc_card_sd(card
) && card
->ssr
.au
) {
1935 card
->pref_erase
= card
->ssr
.au
;
1936 card
->erase_shift
= ffs(card
->ssr
.au
) - 1;
1937 } else if (card
->ext_csd
.hc_erase_size
) {
1938 card
->pref_erase
= card
->ext_csd
.hc_erase_size
;
1939 } else if (card
->erase_size
) {
1940 sz
= (card
->csd
.capacity
<< (card
->csd
.read_blkbits
- 9)) >> 11;
1942 card
->pref_erase
= 512 * 1024 / 512;
1944 card
->pref_erase
= 1024 * 1024 / 512;
1946 card
->pref_erase
= 2 * 1024 * 1024 / 512;
1948 card
->pref_erase
= 4 * 1024 * 1024 / 512;
1949 if (card
->pref_erase
< card
->erase_size
)
1950 card
->pref_erase
= card
->erase_size
;
1952 sz
= card
->pref_erase
% card
->erase_size
;
1954 card
->pref_erase
+= card
->erase_size
- sz
;
1957 card
->pref_erase
= 0;
1960 static unsigned int mmc_mmc_erase_timeout(struct mmc_card
*card
,
1961 unsigned int arg
, unsigned int qty
)
1963 unsigned int erase_timeout
;
1965 if (arg
== MMC_DISCARD_ARG
||
1966 (arg
== MMC_TRIM_ARG
&& card
->ext_csd
.rev
>= 6)) {
1967 erase_timeout
= card
->ext_csd
.trim_timeout
;
1968 } else if (card
->ext_csd
.erase_group_def
& 1) {
1969 /* High Capacity Erase Group Size uses HC timeouts */
1970 if (arg
== MMC_TRIM_ARG
)
1971 erase_timeout
= card
->ext_csd
.trim_timeout
;
1973 erase_timeout
= card
->ext_csd
.hc_erase_timeout
;
1975 /* CSD Erase Group Size uses write timeout */
1976 unsigned int mult
= (10 << card
->csd
.r2w_factor
);
1977 unsigned int timeout_clks
= card
->csd
.tacc_clks
* mult
;
1978 unsigned int timeout_us
;
1980 /* Avoid overflow: e.g. tacc_ns=80000000 mult=1280 */
1981 if (card
->csd
.tacc_ns
< 1000000)
1982 timeout_us
= (card
->csd
.tacc_ns
* mult
) / 1000;
1984 timeout_us
= (card
->csd
.tacc_ns
/ 1000) * mult
;
1987 * ios.clock is only a target. The real clock rate might be
1988 * less but not that much less, so fudge it by multiplying by 2.
1991 timeout_us
+= (timeout_clks
* 1000) /
1992 (card
->host
->ios
.clock
/ 1000);
1994 erase_timeout
= timeout_us
/ 1000;
1997 * Theoretically, the calculation could underflow so round up
1998 * to 1ms in that case.
2004 /* Multiplier for secure operations */
2005 if (arg
& MMC_SECURE_ARGS
) {
2006 if (arg
== MMC_SECURE_ERASE_ARG
)
2007 erase_timeout
*= card
->ext_csd
.sec_erase_mult
;
2009 erase_timeout
*= card
->ext_csd
.sec_trim_mult
;
2012 erase_timeout
*= qty
;
2015 * Ensure at least a 1 second timeout for SPI as per
2016 * 'mmc_set_data_timeout()'
2018 if (mmc_host_is_spi(card
->host
) && erase_timeout
< 1000)
2019 erase_timeout
= 1000;
2021 return erase_timeout
;
2024 static unsigned int mmc_sd_erase_timeout(struct mmc_card
*card
,
2028 unsigned int erase_timeout
;
2030 if (card
->ssr
.erase_timeout
) {
2031 /* Erase timeout specified in SD Status Register (SSR) */
2032 erase_timeout
= card
->ssr
.erase_timeout
* qty
+
2033 card
->ssr
.erase_offset
;
2036 * Erase timeout not specified in SD Status Register (SSR) so
2037 * use 250ms per write block.
2039 erase_timeout
= 250 * qty
;
2042 /* Must not be less than 1 second */
2043 if (erase_timeout
< 1000)
2044 erase_timeout
= 1000;
2046 return erase_timeout
;
2049 static unsigned int mmc_erase_timeout(struct mmc_card
*card
,
2053 if (mmc_card_sd(card
))
2054 return mmc_sd_erase_timeout(card
, arg
, qty
);
2056 return mmc_mmc_erase_timeout(card
, arg
, qty
);
2059 static int mmc_do_erase(struct mmc_card
*card
, unsigned int from
,
2060 unsigned int to
, unsigned int arg
)
2062 struct mmc_command cmd
= {0};
2063 unsigned int qty
= 0;
2064 unsigned long timeout
;
2067 mmc_retune_hold(card
->host
);
2070 * qty is used to calculate the erase timeout which depends on how many
2071 * erase groups (or allocation units in SD terminology) are affected.
2072 * We count erasing part of an erase group as one erase group.
2073 * For SD, the allocation units are always a power of 2. For MMC, the
2074 * erase group size is almost certainly also power of 2, but it does not
2075 * seem to insist on that in the JEDEC standard, so we fall back to
2076 * division in that case. SD may not specify an allocation unit size,
2077 * in which case the timeout is based on the number of write blocks.
2079 * Note that the timeout for secure trim 2 will only be correct if the
2080 * number of erase groups specified is the same as the total of all
2081 * preceding secure trim 1 commands. Since the power may have been
2082 * lost since the secure trim 1 commands occurred, it is generally
2083 * impossible to calculate the secure trim 2 timeout correctly.
2085 if (card
->erase_shift
)
2086 qty
+= ((to
>> card
->erase_shift
) -
2087 (from
>> card
->erase_shift
)) + 1;
2088 else if (mmc_card_sd(card
))
2089 qty
+= to
- from
+ 1;
2091 qty
+= ((to
/ card
->erase_size
) -
2092 (from
/ card
->erase_size
)) + 1;
2094 if (!mmc_card_blockaddr(card
)) {
2099 if (mmc_card_sd(card
))
2100 cmd
.opcode
= SD_ERASE_WR_BLK_START
;
2102 cmd
.opcode
= MMC_ERASE_GROUP_START
;
2104 cmd
.flags
= MMC_RSP_SPI_R1
| MMC_RSP_R1
| MMC_CMD_AC
;
2105 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 0);
2107 pr_err("mmc_erase: group start error %d, "
2108 "status %#x\n", err
, cmd
.resp
[0]);
2113 memset(&cmd
, 0, sizeof(struct mmc_command
));
2114 if (mmc_card_sd(card
))
2115 cmd
.opcode
= SD_ERASE_WR_BLK_END
;
2117 cmd
.opcode
= MMC_ERASE_GROUP_END
;
2119 cmd
.flags
= MMC_RSP_SPI_R1
| MMC_RSP_R1
| MMC_CMD_AC
;
2120 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 0);
2122 pr_err("mmc_erase: group end error %d, status %#x\n",
2128 memset(&cmd
, 0, sizeof(struct mmc_command
));
2129 cmd
.opcode
= MMC_ERASE
;
2131 cmd
.flags
= MMC_RSP_SPI_R1B
| MMC_RSP_R1B
| MMC_CMD_AC
;
2132 cmd
.busy_timeout
= mmc_erase_timeout(card
, arg
, qty
);
2133 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 0);
2135 pr_err("mmc_erase: erase error %d, status %#x\n",
2141 if (mmc_host_is_spi(card
->host
))
2144 timeout
= jiffies
+ msecs_to_jiffies(MMC_CORE_TIMEOUT_MS
);
2146 memset(&cmd
, 0, sizeof(struct mmc_command
));
2147 cmd
.opcode
= MMC_SEND_STATUS
;
2148 cmd
.arg
= card
->rca
<< 16;
2149 cmd
.flags
= MMC_RSP_R1
| MMC_CMD_AC
;
2150 /* Do not retry else we can't see errors */
2151 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 0);
2152 if (err
|| (cmd
.resp
[0] & 0xFDF92000)) {
2153 pr_err("error %d requesting status %#x\n",
2159 /* Timeout if the device never becomes ready for data and
2160 * never leaves the program state.
2162 if (time_after(jiffies
, timeout
)) {
2163 pr_err("%s: Card stuck in programming state! %s\n",
2164 mmc_hostname(card
->host
), __func__
);
2169 } while (!(cmd
.resp
[0] & R1_READY_FOR_DATA
) ||
2170 (R1_CURRENT_STATE(cmd
.resp
[0]) == R1_STATE_PRG
));
2172 mmc_retune_release(card
->host
);
2177 * mmc_erase - erase sectors.
2178 * @card: card to erase
2179 * @from: first sector to erase
2180 * @nr: number of sectors to erase
2181 * @arg: erase command argument (SD supports only %MMC_ERASE_ARG)
2183 * Caller must claim host before calling this function.
2185 int mmc_erase(struct mmc_card
*card
, unsigned int from
, unsigned int nr
,
2188 unsigned int rem
, to
= from
+ nr
;
2191 if (!(card
->host
->caps
& MMC_CAP_ERASE
) ||
2192 !(card
->csd
.cmdclass
& CCC_ERASE
))
2195 if (!card
->erase_size
)
2198 if (mmc_card_sd(card
) && arg
!= MMC_ERASE_ARG
)
2201 if ((arg
& MMC_SECURE_ARGS
) &&
2202 !(card
->ext_csd
.sec_feature_support
& EXT_CSD_SEC_ER_EN
))
2205 if ((arg
& MMC_TRIM_ARGS
) &&
2206 !(card
->ext_csd
.sec_feature_support
& EXT_CSD_SEC_GB_CL_EN
))
2209 if (arg
== MMC_SECURE_ERASE_ARG
) {
2210 if (from
% card
->erase_size
|| nr
% card
->erase_size
)
2214 if (arg
== MMC_ERASE_ARG
) {
2215 rem
= from
% card
->erase_size
;
2217 rem
= card
->erase_size
- rem
;
2224 rem
= nr
% card
->erase_size
;
2237 /* 'from' and 'to' are inclusive */
2241 * Special case where only one erase-group fits in the timeout budget:
2242 * If the region crosses an erase-group boundary on this particular
2243 * case, we will be trimming more than one erase-group which, does not
2244 * fit in the timeout budget of the controller, so we need to split it
2245 * and call mmc_do_erase() twice if necessary. This special case is
2246 * identified by the card->eg_boundary flag.
2248 rem
= card
->erase_size
- (from
% card
->erase_size
);
2249 if ((arg
& MMC_TRIM_ARGS
) && (card
->eg_boundary
) && (nr
> rem
)) {
2250 err
= mmc_do_erase(card
, from
, from
+ rem
- 1, arg
);
2252 if ((err
) || (to
<= from
))
2256 return mmc_do_erase(card
, from
, to
, arg
);
2258 EXPORT_SYMBOL(mmc_erase
);
2260 int mmc_can_erase(struct mmc_card
*card
)
2262 if ((card
->host
->caps
& MMC_CAP_ERASE
) &&
2263 (card
->csd
.cmdclass
& CCC_ERASE
) && card
->erase_size
)
2267 EXPORT_SYMBOL(mmc_can_erase
);
2269 int mmc_can_trim(struct mmc_card
*card
)
2271 if ((card
->ext_csd
.sec_feature_support
& EXT_CSD_SEC_GB_CL_EN
) &&
2272 (!(card
->quirks
& MMC_QUIRK_TRIM_BROKEN
)))
2276 EXPORT_SYMBOL(mmc_can_trim
);
2278 int mmc_can_discard(struct mmc_card
*card
)
2281 * As there's no way to detect the discard support bit at v4.5
2282 * use the s/w feature support filed.
2284 if (card
->ext_csd
.feature_support
& MMC_DISCARD_FEATURE
)
2288 EXPORT_SYMBOL(mmc_can_discard
);
2290 int mmc_can_sanitize(struct mmc_card
*card
)
2292 if (!mmc_can_trim(card
) && !mmc_can_erase(card
))
2294 if (card
->ext_csd
.sec_feature_support
& EXT_CSD_SEC_SANITIZE
)
2298 EXPORT_SYMBOL(mmc_can_sanitize
);
2300 int mmc_can_secure_erase_trim(struct mmc_card
*card
)
2302 if ((card
->ext_csd
.sec_feature_support
& EXT_CSD_SEC_ER_EN
) &&
2303 !(card
->quirks
& MMC_QUIRK_SEC_ERASE_TRIM_BROKEN
))
2307 EXPORT_SYMBOL(mmc_can_secure_erase_trim
);
2309 int mmc_erase_group_aligned(struct mmc_card
*card
, unsigned int from
,
2312 if (!card
->erase_size
)
2314 if (from
% card
->erase_size
|| nr
% card
->erase_size
)
2318 EXPORT_SYMBOL(mmc_erase_group_aligned
);
2320 static unsigned int mmc_do_calc_max_discard(struct mmc_card
*card
,
2323 struct mmc_host
*host
= card
->host
;
2324 unsigned int max_discard
, x
, y
, qty
= 0, max_qty
, timeout
;
2325 unsigned int last_timeout
= 0;
2327 if (card
->erase_shift
)
2328 max_qty
= UINT_MAX
>> card
->erase_shift
;
2329 else if (mmc_card_sd(card
))
2332 max_qty
= UINT_MAX
/ card
->erase_size
;
2334 /* Find the largest qty with an OK timeout */
2337 for (x
= 1; x
&& x
<= max_qty
&& max_qty
- x
>= qty
; x
<<= 1) {
2338 timeout
= mmc_erase_timeout(card
, arg
, qty
+ x
);
2339 if (timeout
> host
->max_busy_timeout
)
2341 if (timeout
< last_timeout
)
2343 last_timeout
= timeout
;
2353 * When specifying a sector range to trim, chances are we might cross
2354 * an erase-group boundary even if the amount of sectors is less than
2356 * If we can only fit one erase-group in the controller timeout budget,
2357 * we have to care that erase-group boundaries are not crossed by a
2358 * single trim operation. We flag that special case with "eg_boundary".
2359 * In all other cases we can just decrement qty and pretend that we
2360 * always touch (qty + 1) erase-groups as a simple optimization.
2363 card
->eg_boundary
= 1;
2367 /* Convert qty to sectors */
2368 if (card
->erase_shift
)
2369 max_discard
= qty
<< card
->erase_shift
;
2370 else if (mmc_card_sd(card
))
2371 max_discard
= qty
+ 1;
2373 max_discard
= qty
* card
->erase_size
;
2378 unsigned int mmc_calc_max_discard(struct mmc_card
*card
)
2380 struct mmc_host
*host
= card
->host
;
2381 unsigned int max_discard
, max_trim
;
2383 if (!host
->max_busy_timeout
)
2387 * Without erase_group_def set, MMC erase timeout depends on clock
2388 * frequence which can change. In that case, the best choice is
2389 * just the preferred erase size.
2391 if (mmc_card_mmc(card
) && !(card
->ext_csd
.erase_group_def
& 1))
2392 return card
->pref_erase
;
2394 max_discard
= mmc_do_calc_max_discard(card
, MMC_ERASE_ARG
);
2395 if (mmc_can_trim(card
)) {
2396 max_trim
= mmc_do_calc_max_discard(card
, MMC_TRIM_ARG
);
2397 if (max_trim
< max_discard
)
2398 max_discard
= max_trim
;
2399 } else if (max_discard
< card
->erase_size
) {
2402 pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n",
2403 mmc_hostname(host
), max_discard
, host
->max_busy_timeout
);
2406 EXPORT_SYMBOL(mmc_calc_max_discard
);
2408 int mmc_set_blocklen(struct mmc_card
*card
, unsigned int blocklen
)
2410 struct mmc_command cmd
= {0};
2412 if (mmc_card_blockaddr(card
) || mmc_card_ddr52(card
))
2415 cmd
.opcode
= MMC_SET_BLOCKLEN
;
2417 cmd
.flags
= MMC_RSP_SPI_R1
| MMC_RSP_R1
| MMC_CMD_AC
;
2418 return mmc_wait_for_cmd(card
->host
, &cmd
, 5);
2420 EXPORT_SYMBOL(mmc_set_blocklen
);
2422 int mmc_set_blockcount(struct mmc_card
*card
, unsigned int blockcount
,
2425 struct mmc_command cmd
= {0};
2427 cmd
.opcode
= MMC_SET_BLOCK_COUNT
;
2428 cmd
.arg
= blockcount
& 0x0000FFFF;
2431 cmd
.flags
= MMC_RSP_SPI_R1
| MMC_RSP_R1
| MMC_CMD_AC
;
2432 return mmc_wait_for_cmd(card
->host
, &cmd
, 5);
2434 EXPORT_SYMBOL(mmc_set_blockcount
);
2436 static void mmc_hw_reset_for_init(struct mmc_host
*host
)
2438 if (!(host
->caps
& MMC_CAP_HW_RESET
) || !host
->ops
->hw_reset
)
2440 host
->ops
->hw_reset(host
);
2443 int mmc_hw_reset(struct mmc_host
*host
)
2451 if (!host
->bus_ops
|| host
->bus_dead
|| !host
->bus_ops
->reset
) {
2456 ret
= host
->bus_ops
->reset(host
);
2460 pr_warn("%s: tried to reset card, got error %d\n",
2461 mmc_hostname(host
), ret
);
2465 EXPORT_SYMBOL(mmc_hw_reset
);
2467 static int mmc_rescan_try_freq(struct mmc_host
*host
, unsigned freq
)
2469 host
->f_init
= freq
;
2471 #ifdef CONFIG_MMC_DEBUG
2472 pr_info("%s: %s: trying to init card at %u Hz\n",
2473 mmc_hostname(host
), __func__
, host
->f_init
);
2475 mmc_power_up(host
, host
->ocr_avail
);
2478 * Some eMMCs (with VCCQ always on) may not be reset after power up, so
2479 * do a hardware reset if possible.
2481 mmc_hw_reset_for_init(host
);
2484 * sdio_reset sends CMD52 to reset card. Since we do not know
2485 * if the card is being re-initialized, just send it. CMD52
2486 * should be ignored by SD/eMMC cards.
2487 * Skip it if we already know that we do not support SDIO commands
2489 if (!(host
->caps2
& MMC_CAP2_NO_SDIO
))
2494 mmc_send_if_cond(host
, host
->ocr_avail
);
2496 /* Order's important: probe SDIO, then SD, then MMC */
2497 if (!(host
->caps2
& MMC_CAP2_NO_SDIO
))
2498 if (!mmc_attach_sdio(host
))
2501 if (!mmc_attach_sd(host
))
2503 if (!mmc_attach_mmc(host
))
2506 mmc_power_off(host
);
2510 int _mmc_detect_card_removed(struct mmc_host
*host
)
2514 if (!host
->card
|| mmc_card_removed(host
->card
))
2517 ret
= host
->bus_ops
->alive(host
);
2520 * Card detect status and alive check may be out of sync if card is
2521 * removed slowly, when card detect switch changes while card/slot
2522 * pads are still contacted in hardware (refer to "SD Card Mechanical
2523 * Addendum, Appendix C: Card Detection Switch"). So reschedule a
2524 * detect work 200ms later for this case.
2526 if (!ret
&& host
->ops
->get_cd
&& !host
->ops
->get_cd(host
)) {
2527 mmc_detect_change(host
, msecs_to_jiffies(200));
2528 pr_debug("%s: card removed too slowly\n", mmc_hostname(host
));
2532 mmc_card_set_removed(host
->card
);
2533 pr_debug("%s: card remove detected\n", mmc_hostname(host
));
2539 int mmc_detect_card_removed(struct mmc_host
*host
)
2541 struct mmc_card
*card
= host
->card
;
2544 WARN_ON(!host
->claimed
);
2549 if (!mmc_card_is_removable(host
))
2552 ret
= mmc_card_removed(card
);
2554 * The card will be considered unchanged unless we have been asked to
2555 * detect a change or host requires polling to provide card detection.
2557 if (!host
->detect_change
&& !(host
->caps
& MMC_CAP_NEEDS_POLL
))
2560 host
->detect_change
= 0;
2562 ret
= _mmc_detect_card_removed(host
);
2563 if (ret
&& (host
->caps
& MMC_CAP_NEEDS_POLL
)) {
2565 * Schedule a detect work as soon as possible to let a
2566 * rescan handle the card removal.
2568 cancel_delayed_work(&host
->detect
);
2569 _mmc_detect_change(host
, 0, false);
2575 EXPORT_SYMBOL(mmc_detect_card_removed
);
2577 void mmc_rescan(struct work_struct
*work
)
2579 struct mmc_host
*host
=
2580 container_of(work
, struct mmc_host
, detect
.work
);
2583 if (host
->rescan_disable
)
2586 /* If there is a non-removable card registered, only scan once */
2587 if (!mmc_card_is_removable(host
) && host
->rescan_entered
)
2589 host
->rescan_entered
= 1;
2591 if (host
->trigger_card_event
&& host
->ops
->card_event
) {
2592 mmc_claim_host(host
);
2593 host
->ops
->card_event(host
);
2594 mmc_release_host(host
);
2595 host
->trigger_card_event
= false;
2601 * if there is a _removable_ card registered, check whether it is
2604 if (host
->bus_ops
&& !host
->bus_dead
&& mmc_card_is_removable(host
))
2605 host
->bus_ops
->detect(host
);
2607 host
->detect_change
= 0;
2610 * Let mmc_bus_put() free the bus/bus_ops if we've found that
2611 * the card is no longer present.
2616 /* if there still is a card present, stop here */
2617 if (host
->bus_ops
!= NULL
) {
2623 * Only we can add a new handler, so it's safe to
2624 * release the lock here.
2628 mmc_claim_host(host
);
2629 if (mmc_card_is_removable(host
) && host
->ops
->get_cd
&&
2630 host
->ops
->get_cd(host
) == 0) {
2631 mmc_power_off(host
);
2632 mmc_release_host(host
);
2636 for (i
= 0; i
< ARRAY_SIZE(freqs
); i
++) {
2637 if (!mmc_rescan_try_freq(host
, max(freqs
[i
], host
->f_min
)))
2639 if (freqs
[i
] <= host
->f_min
)
2642 mmc_release_host(host
);
2645 if (host
->caps
& MMC_CAP_NEEDS_POLL
)
2646 mmc_schedule_delayed_work(&host
->detect
, HZ
);
2649 void mmc_start_host(struct mmc_host
*host
)
2651 host
->f_init
= max(freqs
[0], host
->f_min
);
2652 host
->rescan_disable
= 0;
2653 host
->ios
.power_mode
= MMC_POWER_UNDEFINED
;
2655 mmc_claim_host(host
);
2656 if (host
->caps2
& MMC_CAP2_NO_PRESCAN_POWERUP
)
2657 mmc_power_off(host
);
2659 mmc_power_up(host
, host
->ocr_avail
);
2660 mmc_release_host(host
);
2662 mmc_gpiod_request_cd_irq(host
);
2663 _mmc_detect_change(host
, 0, false);
2666 void mmc_stop_host(struct mmc_host
*host
)
2668 #ifdef CONFIG_MMC_DEBUG
2669 unsigned long flags
;
2670 spin_lock_irqsave(&host
->lock
, flags
);
2672 spin_unlock_irqrestore(&host
->lock
, flags
);
2674 if (host
->slot
.cd_irq
>= 0)
2675 disable_irq(host
->slot
.cd_irq
);
2677 host
->rescan_disable
= 1;
2678 cancel_delayed_work_sync(&host
->detect
);
2680 /* clear pm flags now and let card drivers set them as needed */
2684 if (host
->bus_ops
&& !host
->bus_dead
) {
2685 /* Calling bus_ops->remove() with a claimed host can deadlock */
2686 host
->bus_ops
->remove(host
);
2687 mmc_claim_host(host
);
2688 mmc_detach_bus(host
);
2689 mmc_power_off(host
);
2690 mmc_release_host(host
);
2698 mmc_claim_host(host
);
2699 mmc_power_off(host
);
2700 mmc_release_host(host
);
2703 int mmc_power_save_host(struct mmc_host
*host
)
2707 #ifdef CONFIG_MMC_DEBUG
2708 pr_info("%s: %s: powering down\n", mmc_hostname(host
), __func__
);
2713 if (!host
->bus_ops
|| host
->bus_dead
) {
2718 if (host
->bus_ops
->power_save
)
2719 ret
= host
->bus_ops
->power_save(host
);
2723 mmc_power_off(host
);
2727 EXPORT_SYMBOL(mmc_power_save_host
);
2729 int mmc_power_restore_host(struct mmc_host
*host
)
2733 #ifdef CONFIG_MMC_DEBUG
2734 pr_info("%s: %s: powering up\n", mmc_hostname(host
), __func__
);
2739 if (!host
->bus_ops
|| host
->bus_dead
) {
2744 mmc_power_up(host
, host
->card
->ocr
);
2745 ret
= host
->bus_ops
->power_restore(host
);
2751 EXPORT_SYMBOL(mmc_power_restore_host
);
2754 * Flush the cache to the non-volatile storage.
2756 int mmc_flush_cache(struct mmc_card
*card
)
2760 if (mmc_card_mmc(card
) &&
2761 (card
->ext_csd
.cache_size
> 0) &&
2762 (card
->ext_csd
.cache_ctrl
& 1)) {
2763 err
= mmc_switch(card
, EXT_CSD_CMD_SET_NORMAL
,
2764 EXT_CSD_FLUSH_CACHE
, 1, 0);
2766 pr_err("%s: cache flush error %d\n",
2767 mmc_hostname(card
->host
), err
);
2772 EXPORT_SYMBOL(mmc_flush_cache
);
2774 #ifdef CONFIG_PM_SLEEP
2775 /* Do the card removal on suspend if card is assumed removeable
2776 * Do that in pm notifier while userspace isn't yet frozen, so we will be able
2779 static int mmc_pm_notify(struct notifier_block
*notify_block
,
2780 unsigned long mode
, void *unused
)
2782 struct mmc_host
*host
= container_of(
2783 notify_block
, struct mmc_host
, pm_notify
);
2784 unsigned long flags
;
2788 case PM_HIBERNATION_PREPARE
:
2789 case PM_SUSPEND_PREPARE
:
2790 case PM_RESTORE_PREPARE
:
2791 spin_lock_irqsave(&host
->lock
, flags
);
2792 host
->rescan_disable
= 1;
2793 spin_unlock_irqrestore(&host
->lock
, flags
);
2794 cancel_delayed_work_sync(&host
->detect
);
2799 /* Validate prerequisites for suspend */
2800 if (host
->bus_ops
->pre_suspend
)
2801 err
= host
->bus_ops
->pre_suspend(host
);
2805 /* Calling bus_ops->remove() with a claimed host can deadlock */
2806 host
->bus_ops
->remove(host
);
2807 mmc_claim_host(host
);
2808 mmc_detach_bus(host
);
2809 mmc_power_off(host
);
2810 mmc_release_host(host
);
2814 case PM_POST_SUSPEND
:
2815 case PM_POST_HIBERNATION
:
2816 case PM_POST_RESTORE
:
2818 spin_lock_irqsave(&host
->lock
, flags
);
2819 host
->rescan_disable
= 0;
2820 spin_unlock_irqrestore(&host
->lock
, flags
);
2821 _mmc_detect_change(host
, 0, false);
2828 void mmc_register_pm_notifier(struct mmc_host
*host
)
2830 host
->pm_notify
.notifier_call
= mmc_pm_notify
;
2831 register_pm_notifier(&host
->pm_notify
);
2834 void mmc_unregister_pm_notifier(struct mmc_host
*host
)
2836 unregister_pm_notifier(&host
->pm_notify
);
2841 * mmc_init_context_info() - init synchronization context
2844 * Init struct context_info needed to implement asynchronous
2845 * request mechanism, used by mmc core, host driver and mmc requests
2848 void mmc_init_context_info(struct mmc_host
*host
)
2850 spin_lock_init(&host
->context_info
.lock
);
2851 host
->context_info
.is_new_req
= false;
2852 host
->context_info
.is_done_rcv
= false;
2853 host
->context_info
.is_waiting_last_req
= false;
2854 init_waitqueue_head(&host
->context_info
.wait
);
2857 static int __init
mmc_init(void)
2861 ret
= mmc_register_bus();
2865 ret
= mmc_register_host_class();
2867 goto unregister_bus
;
2869 ret
= sdio_register_bus();
2871 goto unregister_host_class
;
2875 unregister_host_class
:
2876 mmc_unregister_host_class();
2878 mmc_unregister_bus();
2882 static void __exit
mmc_exit(void)
2884 sdio_unregister_bus();
2885 mmc_unregister_host_class();
2886 mmc_unregister_bus();
2889 subsys_initcall(mmc_init
);
2890 module_exit(mmc_exit
);
2892 MODULE_LICENSE("GPL");