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>
49 /* If the device is not responding */
50 #define MMC_CORE_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute timeout */
53 * Background operations can take a long time, depending on the housekeeping
54 * operations the card has to perform.
56 #define MMC_BKOPS_MAX_TIMEOUT (4 * 60 * 1000) /* max time to wait in ms */
58 static struct workqueue_struct
*workqueue
;
59 static const unsigned freqs
[] = { 400000, 300000, 200000, 100000 };
62 * Enabling software CRCs on the data blocks can be a significant (30%)
63 * performance cost, and for other reasons may not always be desired.
64 * So we allow it it to be disabled.
67 module_param(use_spi_crc
, bool, 0);
70 * Internal function. Schedule delayed work in the MMC work queue.
72 static int mmc_schedule_delayed_work(struct delayed_work
*work
,
75 return queue_delayed_work(workqueue
, work
, delay
);
79 * Internal function. Flush all scheduled work from the MMC work queue.
81 static void mmc_flush_scheduled_work(void)
83 flush_workqueue(workqueue
);
86 #ifdef CONFIG_FAIL_MMC_REQUEST
89 * Internal function. Inject random data errors.
90 * If mmc_data is NULL no errors are injected.
92 static void mmc_should_fail_request(struct mmc_host
*host
,
93 struct mmc_request
*mrq
)
95 struct mmc_command
*cmd
= mrq
->cmd
;
96 struct mmc_data
*data
= mrq
->data
;
97 static const int data_errors
[] = {
106 if (cmd
->error
|| data
->error
||
107 !should_fail(&host
->fail_mmc_request
, data
->blksz
* data
->blocks
))
110 data
->error
= data_errors
[prandom_u32() % ARRAY_SIZE(data_errors
)];
111 data
->bytes_xfered
= (prandom_u32() % (data
->bytes_xfered
>> 9)) << 9;
114 #else /* CONFIG_FAIL_MMC_REQUEST */
116 static inline void mmc_should_fail_request(struct mmc_host
*host
,
117 struct mmc_request
*mrq
)
121 #endif /* CONFIG_FAIL_MMC_REQUEST */
124 * mmc_request_done - finish processing an MMC request
125 * @host: MMC host which completed request
126 * @mrq: MMC request which request
128 * MMC drivers should call this function when they have completed
129 * their processing of a request.
131 void mmc_request_done(struct mmc_host
*host
, struct mmc_request
*mrq
)
133 struct mmc_command
*cmd
= mrq
->cmd
;
134 int err
= cmd
->error
;
136 if (err
&& cmd
->retries
&& mmc_host_is_spi(host
)) {
137 if (cmd
->resp
[0] & R1_SPI_ILLEGAL_COMMAND
)
141 if (err
&& cmd
->retries
&& !mmc_card_removed(host
->card
)) {
143 * Request starter must handle retries - see
144 * mmc_wait_for_req_done().
149 mmc_should_fail_request(host
, mrq
);
151 led_trigger_event(host
->led
, LED_OFF
);
154 pr_debug("%s: req done <CMD%u>: %d: %08x %08x %08x %08x\n",
155 mmc_hostname(host
), mrq
->sbc
->opcode
,
157 mrq
->sbc
->resp
[0], mrq
->sbc
->resp
[1],
158 mrq
->sbc
->resp
[2], mrq
->sbc
->resp
[3]);
161 pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n",
162 mmc_hostname(host
), cmd
->opcode
, err
,
163 cmd
->resp
[0], cmd
->resp
[1],
164 cmd
->resp
[2], cmd
->resp
[3]);
167 pr_debug("%s: %d bytes transferred: %d\n",
169 mrq
->data
->bytes_xfered
, mrq
->data
->error
);
173 pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n",
174 mmc_hostname(host
), mrq
->stop
->opcode
,
176 mrq
->stop
->resp
[0], mrq
->stop
->resp
[1],
177 mrq
->stop
->resp
[2], mrq
->stop
->resp
[3]);
183 mmc_host_clk_release(host
);
187 EXPORT_SYMBOL(mmc_request_done
);
189 static int mmc_start_request(struct mmc_host
*host
, struct mmc_request
*mrq
)
191 #ifdef CONFIG_MMC_DEBUG
193 struct scatterlist
*sg
;
195 if (mmc_card_removed(host
->card
))
199 pr_debug("<%s: starting CMD%u arg %08x flags %08x>\n",
200 mmc_hostname(host
), mrq
->sbc
->opcode
,
201 mrq
->sbc
->arg
, mrq
->sbc
->flags
);
204 pr_debug("%s: starting CMD%u arg %08x flags %08x\n",
205 mmc_hostname(host
), mrq
->cmd
->opcode
,
206 mrq
->cmd
->arg
, mrq
->cmd
->flags
);
209 pr_debug("%s: blksz %d blocks %d flags %08x "
210 "tsac %d ms nsac %d\n",
211 mmc_hostname(host
), mrq
->data
->blksz
,
212 mrq
->data
->blocks
, mrq
->data
->flags
,
213 mrq
->data
->timeout_ns
/ 1000000,
214 mrq
->data
->timeout_clks
);
218 pr_debug("%s: CMD%u arg %08x flags %08x\n",
219 mmc_hostname(host
), mrq
->stop
->opcode
,
220 mrq
->stop
->arg
, mrq
->stop
->flags
);
223 WARN_ON(!host
->claimed
);
232 BUG_ON(mrq
->data
->blksz
> host
->max_blk_size
);
233 BUG_ON(mrq
->data
->blocks
> host
->max_blk_count
);
234 BUG_ON(mrq
->data
->blocks
* mrq
->data
->blksz
>
237 #ifdef CONFIG_MMC_DEBUG
239 for_each_sg(mrq
->data
->sg
, sg
, mrq
->data
->sg_len
, i
)
241 BUG_ON(sz
!= mrq
->data
->blocks
* mrq
->data
->blksz
);
244 mrq
->cmd
->data
= mrq
->data
;
245 mrq
->data
->error
= 0;
246 mrq
->data
->mrq
= mrq
;
248 mrq
->data
->stop
= mrq
->stop
;
249 mrq
->stop
->error
= 0;
250 mrq
->stop
->mrq
= mrq
;
253 mmc_host_clk_hold(host
);
254 led_trigger_event(host
->led
, LED_FULL
);
255 host
->ops
->request(host
, mrq
);
261 * mmc_start_bkops - start BKOPS for supported cards
262 * @card: MMC card to start BKOPS
263 * @form_exception: A flag to indicate if this function was
264 * called due to an exception raised by the card
266 * Start background operations whenever requested.
267 * When the urgent BKOPS bit is set in a R1 command response
268 * then background operations should be started immediately.
270 void mmc_start_bkops(struct mmc_card
*card
, bool from_exception
)
274 bool use_busy_signal
;
278 if (!card
->ext_csd
.bkops_en
|| mmc_card_doing_bkops(card
))
281 err
= mmc_read_bkops_status(card
);
283 pr_err("%s: Failed to read bkops status: %d\n",
284 mmc_hostname(card
->host
), err
);
288 if (!card
->ext_csd
.raw_bkops_status
)
291 if (card
->ext_csd
.raw_bkops_status
< EXT_CSD_BKOPS_LEVEL_2
&&
295 mmc_claim_host(card
->host
);
296 if (card
->ext_csd
.raw_bkops_status
>= EXT_CSD_BKOPS_LEVEL_2
) {
297 timeout
= MMC_BKOPS_MAX_TIMEOUT
;
298 use_busy_signal
= true;
301 use_busy_signal
= false;
304 err
= __mmc_switch(card
, EXT_CSD_CMD_SET_NORMAL
,
305 EXT_CSD_BKOPS_START
, 1, timeout
,
306 use_busy_signal
, true, false);
308 pr_warn("%s: Error %d starting bkops\n",
309 mmc_hostname(card
->host
), err
);
314 * For urgent bkops status (LEVEL_2 and more)
315 * bkops executed synchronously, otherwise
316 * the operation is in progress
318 if (!use_busy_signal
)
319 mmc_card_set_doing_bkops(card
);
321 mmc_release_host(card
->host
);
323 EXPORT_SYMBOL(mmc_start_bkops
);
326 * mmc_wait_data_done() - done callback for data request
327 * @mrq: done data request
329 * Wakes up mmc context, passed as a callback to host controller driver
331 static void mmc_wait_data_done(struct mmc_request
*mrq
)
333 mrq
->host
->context_info
.is_done_rcv
= true;
334 wake_up_interruptible(&mrq
->host
->context_info
.wait
);
337 static void mmc_wait_done(struct mmc_request
*mrq
)
339 complete(&mrq
->completion
);
343 *__mmc_start_data_req() - starts data request
344 * @host: MMC host to start the request
345 * @mrq: data request to start
347 * Sets the done callback to be called when request is completed by the card.
348 * Starts data mmc request execution
350 static int __mmc_start_data_req(struct mmc_host
*host
, struct mmc_request
*mrq
)
354 mrq
->done
= mmc_wait_data_done
;
357 err
= mmc_start_request(host
, mrq
);
359 mrq
->cmd
->error
= err
;
360 mmc_wait_data_done(mrq
);
366 static int __mmc_start_req(struct mmc_host
*host
, struct mmc_request
*mrq
)
370 init_completion(&mrq
->completion
);
371 mrq
->done
= mmc_wait_done
;
373 err
= mmc_start_request(host
, mrq
);
375 mrq
->cmd
->error
= err
;
376 complete(&mrq
->completion
);
383 * mmc_wait_for_data_req_done() - wait for request completed
384 * @host: MMC host to prepare the command.
385 * @mrq: MMC request to wait for
387 * Blocks MMC context till host controller will ack end of data request
388 * execution or new request notification arrives from the block layer.
389 * Handles command retries.
391 * Returns enum mmc_blk_status after checking errors.
393 static int mmc_wait_for_data_req_done(struct mmc_host
*host
,
394 struct mmc_request
*mrq
,
395 struct mmc_async_req
*next_req
)
397 struct mmc_command
*cmd
;
398 struct mmc_context_info
*context_info
= &host
->context_info
;
403 wait_event_interruptible(context_info
->wait
,
404 (context_info
->is_done_rcv
||
405 context_info
->is_new_req
));
406 spin_lock_irqsave(&context_info
->lock
, flags
);
407 context_info
->is_waiting_last_req
= false;
408 spin_unlock_irqrestore(&context_info
->lock
, flags
);
409 if (context_info
->is_done_rcv
) {
410 context_info
->is_done_rcv
= false;
411 context_info
->is_new_req
= false;
414 if (!cmd
->error
|| !cmd
->retries
||
415 mmc_card_removed(host
->card
)) {
416 err
= host
->areq
->err_check(host
->card
,
418 break; /* return err */
420 pr_info("%s: req failed (CMD%u): %d, retrying...\n",
422 cmd
->opcode
, cmd
->error
);
425 host
->ops
->request(host
, mrq
);
426 continue; /* wait for done/new event again */
428 } else if (context_info
->is_new_req
) {
429 context_info
->is_new_req
= false;
431 err
= MMC_BLK_NEW_REQUEST
;
432 break; /* return err */
439 static void mmc_wait_for_req_done(struct mmc_host
*host
,
440 struct mmc_request
*mrq
)
442 struct mmc_command
*cmd
;
445 wait_for_completion(&mrq
->completion
);
450 * If host has timed out waiting for the sanitize
451 * to complete, card might be still in programming state
452 * so let's try to bring the card out of programming
455 if (cmd
->sanitize_busy
&& cmd
->error
== -ETIMEDOUT
) {
456 if (!mmc_interrupt_hpi(host
->card
)) {
457 pr_warn("%s: %s: Interrupted sanitize\n",
458 mmc_hostname(host
), __func__
);
462 pr_err("%s: %s: Failed to interrupt sanitize\n",
463 mmc_hostname(host
), __func__
);
466 if (!cmd
->error
|| !cmd
->retries
||
467 mmc_card_removed(host
->card
))
470 pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
471 mmc_hostname(host
), cmd
->opcode
, cmd
->error
);
474 host
->ops
->request(host
, mrq
);
479 * mmc_pre_req - Prepare for a new request
480 * @host: MMC host to prepare command
481 * @mrq: MMC request to prepare for
482 * @is_first_req: true if there is no previous started request
483 * that may run in parellel to this call, otherwise false
485 * mmc_pre_req() is called in prior to mmc_start_req() to let
486 * host prepare for the new request. Preparation of a request may be
487 * performed while another request is running on the host.
489 static void mmc_pre_req(struct mmc_host
*host
, struct mmc_request
*mrq
,
492 if (host
->ops
->pre_req
) {
493 mmc_host_clk_hold(host
);
494 host
->ops
->pre_req(host
, mrq
, is_first_req
);
495 mmc_host_clk_release(host
);
500 * mmc_post_req - Post process a completed request
501 * @host: MMC host to post process command
502 * @mrq: MMC request to post process for
503 * @err: Error, if non zero, clean up any resources made in pre_req
505 * Let the host post process a completed request. Post processing of
506 * a request may be performed while another reuqest is running.
508 static void mmc_post_req(struct mmc_host
*host
, struct mmc_request
*mrq
,
511 if (host
->ops
->post_req
) {
512 mmc_host_clk_hold(host
);
513 host
->ops
->post_req(host
, mrq
, err
);
514 mmc_host_clk_release(host
);
519 * mmc_start_req - start a non-blocking request
520 * @host: MMC host to start command
521 * @areq: async request to start
522 * @error: out parameter returns 0 for success, otherwise non zero
524 * Start a new MMC custom command request for a host.
525 * If there is on ongoing async request wait for completion
526 * of that request and start the new one and return.
527 * Does not wait for the new request to complete.
529 * Returns the completed request, NULL in case of none completed.
530 * Wait for the an ongoing request (previoulsy started) to complete and
531 * return the completed request. If there is no ongoing request, NULL
532 * is returned without waiting. NULL is not an error condition.
534 struct mmc_async_req
*mmc_start_req(struct mmc_host
*host
,
535 struct mmc_async_req
*areq
, int *error
)
539 struct mmc_async_req
*data
= host
->areq
;
541 /* Prepare a new request */
543 mmc_pre_req(host
, areq
->mrq
, !host
->areq
);
546 err
= mmc_wait_for_data_req_done(host
, host
->areq
->mrq
, areq
);
547 if (err
== MMC_BLK_NEW_REQUEST
) {
551 * The previous request was not completed,
557 * Check BKOPS urgency for each R1 response
559 if (host
->card
&& mmc_card_mmc(host
->card
) &&
560 ((mmc_resp_type(host
->areq
->mrq
->cmd
) == MMC_RSP_R1
) ||
561 (mmc_resp_type(host
->areq
->mrq
->cmd
) == MMC_RSP_R1B
)) &&
562 (host
->areq
->mrq
->cmd
->resp
[0] & R1_EXCEPTION_EVENT
)) {
564 /* Cancel the prepared request */
566 mmc_post_req(host
, areq
->mrq
, -EINVAL
);
568 mmc_start_bkops(host
->card
, true);
570 /* prepare the request again */
572 mmc_pre_req(host
, areq
->mrq
, !host
->areq
);
577 start_err
= __mmc_start_data_req(host
, areq
->mrq
);
580 mmc_post_req(host
, host
->areq
->mrq
, 0);
582 /* Cancel a prepared request if it was not started. */
583 if ((err
|| start_err
) && areq
)
584 mmc_post_req(host
, areq
->mrq
, -EINVAL
);
595 EXPORT_SYMBOL(mmc_start_req
);
598 * mmc_wait_for_req - start a request and wait for completion
599 * @host: MMC host to start command
600 * @mrq: MMC request to start
602 * Start a new MMC custom command request for a host, and wait
603 * for the command to complete. Does not attempt to parse the
606 void mmc_wait_for_req(struct mmc_host
*host
, struct mmc_request
*mrq
)
608 __mmc_start_req(host
, mrq
);
609 mmc_wait_for_req_done(host
, mrq
);
611 EXPORT_SYMBOL(mmc_wait_for_req
);
614 * mmc_interrupt_hpi - Issue for High priority Interrupt
615 * @card: the MMC card associated with the HPI transfer
617 * Issued High Priority Interrupt, and check for card status
618 * until out-of prg-state.
620 int mmc_interrupt_hpi(struct mmc_card
*card
)
624 unsigned long prg_wait
;
628 if (!card
->ext_csd
.hpi_en
) {
629 pr_info("%s: HPI enable bit unset\n", mmc_hostname(card
->host
));
633 mmc_claim_host(card
->host
);
634 err
= mmc_send_status(card
, &status
);
636 pr_err("%s: Get card status fail\n", mmc_hostname(card
->host
));
640 switch (R1_CURRENT_STATE(status
)) {
646 * In idle and transfer states, HPI is not needed and the caller
647 * can issue the next intended command immediately
653 /* In all other states, it's illegal to issue HPI */
654 pr_debug("%s: HPI cannot be sent. Card state=%d\n",
655 mmc_hostname(card
->host
), R1_CURRENT_STATE(status
));
660 err
= mmc_send_hpi_cmd(card
, &status
);
664 prg_wait
= jiffies
+ msecs_to_jiffies(card
->ext_csd
.out_of_int_time
);
666 err
= mmc_send_status(card
, &status
);
668 if (!err
&& R1_CURRENT_STATE(status
) == R1_STATE_TRAN
)
670 if (time_after(jiffies
, prg_wait
))
675 mmc_release_host(card
->host
);
678 EXPORT_SYMBOL(mmc_interrupt_hpi
);
681 * mmc_wait_for_cmd - start a command and wait for completion
682 * @host: MMC host to start command
683 * @cmd: MMC command to start
684 * @retries: maximum number of retries
686 * Start a new MMC command for a host, and wait for the command
687 * to complete. Return any error that occurred while the command
688 * was executing. Do not attempt to parse the response.
690 int mmc_wait_for_cmd(struct mmc_host
*host
, struct mmc_command
*cmd
, int retries
)
692 struct mmc_request mrq
= {NULL
};
694 WARN_ON(!host
->claimed
);
696 memset(cmd
->resp
, 0, sizeof(cmd
->resp
));
697 cmd
->retries
= retries
;
702 mmc_wait_for_req(host
, &mrq
);
707 EXPORT_SYMBOL(mmc_wait_for_cmd
);
710 * mmc_stop_bkops - stop ongoing BKOPS
711 * @card: MMC card to check BKOPS
713 * Send HPI command to stop ongoing background operations to
714 * allow rapid servicing of foreground operations, e.g. read/
715 * writes. Wait until the card comes out of the programming state
716 * to avoid errors in servicing read/write requests.
718 int mmc_stop_bkops(struct mmc_card
*card
)
723 err
= mmc_interrupt_hpi(card
);
726 * If err is EINVAL, we can't issue an HPI.
727 * It should complete the BKOPS.
729 if (!err
|| (err
== -EINVAL
)) {
730 mmc_card_clr_doing_bkops(card
);
736 EXPORT_SYMBOL(mmc_stop_bkops
);
738 int mmc_read_bkops_status(struct mmc_card
*card
)
743 mmc_claim_host(card
->host
);
744 err
= mmc_get_ext_csd(card
, &ext_csd
);
745 mmc_release_host(card
->host
);
749 card
->ext_csd
.raw_bkops_status
= ext_csd
[EXT_CSD_BKOPS_STATUS
];
750 card
->ext_csd
.raw_exception_status
= ext_csd
[EXT_CSD_EXP_EVENTS_STATUS
];
754 EXPORT_SYMBOL(mmc_read_bkops_status
);
757 * mmc_set_data_timeout - set the timeout for a data command
758 * @data: data phase for command
759 * @card: the MMC card associated with the data transfer
761 * Computes the data timeout parameters according to the
762 * correct algorithm given the card type.
764 void mmc_set_data_timeout(struct mmc_data
*data
, const struct mmc_card
*card
)
769 * SDIO cards only define an upper 1 s limit on access.
771 if (mmc_card_sdio(card
)) {
772 data
->timeout_ns
= 1000000000;
773 data
->timeout_clks
= 0;
778 * SD cards use a 100 multiplier rather than 10
780 mult
= mmc_card_sd(card
) ? 100 : 10;
783 * Scale up the multiplier (and therefore the timeout) by
784 * the r2w factor for writes.
786 if (data
->flags
& MMC_DATA_WRITE
)
787 mult
<<= card
->csd
.r2w_factor
;
789 data
->timeout_ns
= card
->csd
.tacc_ns
* mult
;
790 data
->timeout_clks
= card
->csd
.tacc_clks
* mult
;
793 * SD cards also have an upper limit on the timeout.
795 if (mmc_card_sd(card
)) {
796 unsigned int timeout_us
, limit_us
;
798 timeout_us
= data
->timeout_ns
/ 1000;
799 if (mmc_host_clk_rate(card
->host
))
800 timeout_us
+= data
->timeout_clks
* 1000 /
801 (mmc_host_clk_rate(card
->host
) / 1000);
803 if (data
->flags
& MMC_DATA_WRITE
)
805 * The MMC spec "It is strongly recommended
806 * for hosts to implement more than 500ms
807 * timeout value even if the card indicates
808 * the 250ms maximum busy length." Even the
809 * previous value of 300ms is known to be
810 * insufficient for some cards.
817 * SDHC cards always use these fixed values.
819 if (timeout_us
> limit_us
|| mmc_card_blockaddr(card
)) {
820 data
->timeout_ns
= limit_us
* 1000;
821 data
->timeout_clks
= 0;
824 /* assign limit value if invalid */
826 data
->timeout_ns
= limit_us
* 1000;
830 * Some cards require longer data read timeout than indicated in CSD.
831 * Address this by setting the read timeout to a "reasonably high"
832 * value. For the cards tested, 300ms has proven enough. If necessary,
833 * this value can be increased if other problematic cards require this.
835 if (mmc_card_long_read_time(card
) && data
->flags
& MMC_DATA_READ
) {
836 data
->timeout_ns
= 300000000;
837 data
->timeout_clks
= 0;
841 * Some cards need very high timeouts if driven in SPI mode.
842 * The worst observed timeout was 900ms after writing a
843 * continuous stream of data until the internal logic
846 if (mmc_host_is_spi(card
->host
)) {
847 if (data
->flags
& MMC_DATA_WRITE
) {
848 if (data
->timeout_ns
< 1000000000)
849 data
->timeout_ns
= 1000000000; /* 1s */
851 if (data
->timeout_ns
< 100000000)
852 data
->timeout_ns
= 100000000; /* 100ms */
856 EXPORT_SYMBOL(mmc_set_data_timeout
);
859 * mmc_align_data_size - pads a transfer size to a more optimal value
860 * @card: the MMC card associated with the data transfer
861 * @sz: original transfer size
863 * Pads the original data size with a number of extra bytes in
864 * order to avoid controller bugs and/or performance hits
865 * (e.g. some controllers revert to PIO for certain sizes).
867 * Returns the improved size, which might be unmodified.
869 * Note that this function is only relevant when issuing a
870 * single scatter gather entry.
872 unsigned int mmc_align_data_size(struct mmc_card
*card
, unsigned int sz
)
875 * FIXME: We don't have a system for the controller to tell
876 * the core about its problems yet, so for now we just 32-bit
879 sz
= ((sz
+ 3) / 4) * 4;
883 EXPORT_SYMBOL(mmc_align_data_size
);
886 * __mmc_claim_host - exclusively claim a host
887 * @host: mmc host to claim
888 * @abort: whether or not the operation should be aborted
890 * Claim a host for a set of operations. If @abort is non null and
891 * dereference a non-zero value then this will return prematurely with
892 * that non-zero value without acquiring the lock. Returns zero
893 * with the lock held otherwise.
895 int __mmc_claim_host(struct mmc_host
*host
, atomic_t
*abort
)
897 DECLARE_WAITQUEUE(wait
, current
);
903 add_wait_queue(&host
->wq
, &wait
);
904 spin_lock_irqsave(&host
->lock
, flags
);
906 set_current_state(TASK_UNINTERRUPTIBLE
);
907 stop
= abort
? atomic_read(abort
) : 0;
908 if (stop
|| !host
->claimed
|| host
->claimer
== current
)
910 spin_unlock_irqrestore(&host
->lock
, flags
);
912 spin_lock_irqsave(&host
->lock
, flags
);
914 set_current_state(TASK_RUNNING
);
917 host
->claimer
= current
;
918 host
->claim_cnt
+= 1;
921 spin_unlock_irqrestore(&host
->lock
, flags
);
922 remove_wait_queue(&host
->wq
, &wait
);
923 if (host
->ops
->enable
&& !stop
&& host
->claim_cnt
== 1)
924 host
->ops
->enable(host
);
928 EXPORT_SYMBOL(__mmc_claim_host
);
931 * mmc_release_host - release a host
932 * @host: mmc host to release
934 * Release a MMC host, allowing others to claim the host
935 * for their operations.
937 void mmc_release_host(struct mmc_host
*host
)
941 WARN_ON(!host
->claimed
);
943 if (host
->ops
->disable
&& host
->claim_cnt
== 1)
944 host
->ops
->disable(host
);
946 spin_lock_irqsave(&host
->lock
, flags
);
947 if (--host
->claim_cnt
) {
948 /* Release for nested claim */
949 spin_unlock_irqrestore(&host
->lock
, flags
);
952 host
->claimer
= NULL
;
953 spin_unlock_irqrestore(&host
->lock
, flags
);
957 EXPORT_SYMBOL(mmc_release_host
);
960 * This is a helper function, which fetches a runtime pm reference for the
961 * card device and also claims the host.
963 void mmc_get_card(struct mmc_card
*card
)
965 pm_runtime_get_sync(&card
->dev
);
966 mmc_claim_host(card
->host
);
968 EXPORT_SYMBOL(mmc_get_card
);
971 * This is a helper function, which releases the host and drops the runtime
972 * pm reference for the card device.
974 void mmc_put_card(struct mmc_card
*card
)
976 mmc_release_host(card
->host
);
977 pm_runtime_mark_last_busy(&card
->dev
);
978 pm_runtime_put_autosuspend(&card
->dev
);
980 EXPORT_SYMBOL(mmc_put_card
);
983 * Internal function that does the actual ios call to the host driver,
984 * optionally printing some debug output.
986 static inline void mmc_set_ios(struct mmc_host
*host
)
988 struct mmc_ios
*ios
= &host
->ios
;
990 pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u "
991 "width %u timing %u\n",
992 mmc_hostname(host
), ios
->clock
, ios
->bus_mode
,
993 ios
->power_mode
, ios
->chip_select
, ios
->vdd
,
994 ios
->bus_width
, ios
->timing
);
997 mmc_set_ungated(host
);
998 host
->ops
->set_ios(host
, ios
);
1002 * Control chip select pin on a host.
1004 void mmc_set_chip_select(struct mmc_host
*host
, int mode
)
1006 mmc_host_clk_hold(host
);
1007 host
->ios
.chip_select
= mode
;
1009 mmc_host_clk_release(host
);
1013 * Sets the host clock to the highest possible frequency that
1016 static void __mmc_set_clock(struct mmc_host
*host
, unsigned int hz
)
1018 WARN_ON(hz
&& hz
< host
->f_min
);
1020 if (hz
> host
->f_max
)
1023 host
->ios
.clock
= hz
;
1027 void mmc_set_clock(struct mmc_host
*host
, unsigned int hz
)
1029 mmc_host_clk_hold(host
);
1030 __mmc_set_clock(host
, hz
);
1031 mmc_host_clk_release(host
);
1034 #ifdef CONFIG_MMC_CLKGATE
1036 * This gates the clock by setting it to 0 Hz.
1038 void mmc_gate_clock(struct mmc_host
*host
)
1040 unsigned long flags
;
1042 spin_lock_irqsave(&host
->clk_lock
, flags
);
1043 host
->clk_old
= host
->ios
.clock
;
1044 host
->ios
.clock
= 0;
1045 host
->clk_gated
= true;
1046 spin_unlock_irqrestore(&host
->clk_lock
, flags
);
1051 * This restores the clock from gating by using the cached
1054 void mmc_ungate_clock(struct mmc_host
*host
)
1057 * We should previously have gated the clock, so the clock shall
1058 * be 0 here! The clock may however be 0 during initialization,
1059 * when some request operations are performed before setting
1060 * the frequency. When ungate is requested in that situation
1061 * we just ignore the call.
1063 if (host
->clk_old
) {
1064 BUG_ON(host
->ios
.clock
);
1065 /* This call will also set host->clk_gated to false */
1066 __mmc_set_clock(host
, host
->clk_old
);
1070 void mmc_set_ungated(struct mmc_host
*host
)
1072 unsigned long flags
;
1075 * We've been given a new frequency while the clock is gated,
1076 * so make sure we regard this as ungating it.
1078 spin_lock_irqsave(&host
->clk_lock
, flags
);
1079 host
->clk_gated
= false;
1080 spin_unlock_irqrestore(&host
->clk_lock
, flags
);
1084 void mmc_set_ungated(struct mmc_host
*host
)
1089 int mmc_execute_tuning(struct mmc_card
*card
)
1091 struct mmc_host
*host
= card
->host
;
1095 if (!host
->ops
->execute_tuning
)
1098 if (mmc_card_mmc(card
))
1099 opcode
= MMC_SEND_TUNING_BLOCK_HS200
;
1101 opcode
= MMC_SEND_TUNING_BLOCK
;
1103 mmc_host_clk_hold(host
);
1104 err
= host
->ops
->execute_tuning(host
, opcode
);
1105 mmc_host_clk_release(host
);
1108 pr_err("%s: tuning execution failed\n", mmc_hostname(host
));
1114 * Change the bus mode (open drain/push-pull) of a host.
1116 void mmc_set_bus_mode(struct mmc_host
*host
, unsigned int mode
)
1118 mmc_host_clk_hold(host
);
1119 host
->ios
.bus_mode
= mode
;
1121 mmc_host_clk_release(host
);
1125 * Change data bus width of a host.
1127 void mmc_set_bus_width(struct mmc_host
*host
, unsigned int width
)
1129 mmc_host_clk_hold(host
);
1130 host
->ios
.bus_width
= width
;
1132 mmc_host_clk_release(host
);
1136 * Set initial state after a power cycle or a hw_reset.
1138 void mmc_set_initial_state(struct mmc_host
*host
)
1140 if (mmc_host_is_spi(host
))
1141 host
->ios
.chip_select
= MMC_CS_HIGH
;
1143 host
->ios
.chip_select
= MMC_CS_DONTCARE
;
1144 host
->ios
.bus_mode
= MMC_BUSMODE_PUSHPULL
;
1145 host
->ios
.bus_width
= MMC_BUS_WIDTH_1
;
1146 host
->ios
.timing
= MMC_TIMING_LEGACY
;
1152 * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number
1153 * @vdd: voltage (mV)
1154 * @low_bits: prefer low bits in boundary cases
1156 * This function returns the OCR bit number according to the provided @vdd
1157 * value. If conversion is not possible a negative errno value returned.
1159 * Depending on the @low_bits flag the function prefers low or high OCR bits
1160 * on boundary voltages. For example,
1161 * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33);
1162 * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34);
1164 * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21).
1166 static int mmc_vdd_to_ocrbitnum(int vdd
, bool low_bits
)
1168 const int max_bit
= ilog2(MMC_VDD_35_36
);
1171 if (vdd
< 1650 || vdd
> 3600)
1174 if (vdd
>= 1650 && vdd
<= 1950)
1175 return ilog2(MMC_VDD_165_195
);
1180 /* Base 2000 mV, step 100 mV, bit's base 8. */
1181 bit
= (vdd
- 2000) / 100 + 8;
1188 * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask
1189 * @vdd_min: minimum voltage value (mV)
1190 * @vdd_max: maximum voltage value (mV)
1192 * This function returns the OCR mask bits according to the provided @vdd_min
1193 * and @vdd_max values. If conversion is not possible the function returns 0.
1195 * Notes wrt boundary cases:
1196 * This function sets the OCR bits for all boundary voltages, for example
1197 * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 |
1198 * MMC_VDD_34_35 mask.
1200 u32
mmc_vddrange_to_ocrmask(int vdd_min
, int vdd_max
)
1204 if (vdd_max
< vdd_min
)
1207 /* Prefer high bits for the boundary vdd_max values. */
1208 vdd_max
= mmc_vdd_to_ocrbitnum(vdd_max
, false);
1212 /* Prefer low bits for the boundary vdd_min values. */
1213 vdd_min
= mmc_vdd_to_ocrbitnum(vdd_min
, true);
1217 /* Fill the mask, from max bit to min bit. */
1218 while (vdd_max
>= vdd_min
)
1219 mask
|= 1 << vdd_max
--;
1223 EXPORT_SYMBOL(mmc_vddrange_to_ocrmask
);
1228 * mmc_of_parse_voltage - return mask of supported voltages
1229 * @np: The device node need to be parsed.
1230 * @mask: mask of voltages available for MMC/SD/SDIO
1232 * 1. Return zero on success.
1233 * 2. Return negative errno: voltage-range is invalid.
1235 int mmc_of_parse_voltage(struct device_node
*np
, u32
*mask
)
1237 const u32
*voltage_ranges
;
1240 voltage_ranges
= of_get_property(np
, "voltage-ranges", &num_ranges
);
1241 num_ranges
= num_ranges
/ sizeof(*voltage_ranges
) / 2;
1242 if (!voltage_ranges
|| !num_ranges
) {
1243 pr_info("%s: voltage-ranges unspecified\n", np
->full_name
);
1247 for (i
= 0; i
< num_ranges
; i
++) {
1248 const int j
= i
* 2;
1251 ocr_mask
= mmc_vddrange_to_ocrmask(
1252 be32_to_cpu(voltage_ranges
[j
]),
1253 be32_to_cpu(voltage_ranges
[j
+ 1]));
1255 pr_err("%s: voltage-range #%d is invalid\n",
1264 EXPORT_SYMBOL(mmc_of_parse_voltage
);
1266 #endif /* CONFIG_OF */
1268 static int mmc_of_get_func_num(struct device_node
*node
)
1273 ret
= of_property_read_u32(node
, "reg", ®
);
1280 struct device_node
*mmc_of_find_child_device(struct mmc_host
*host
,
1283 struct device_node
*node
;
1285 if (!host
->parent
|| !host
->parent
->of_node
)
1288 for_each_child_of_node(host
->parent
->of_node
, node
) {
1289 if (mmc_of_get_func_num(node
) == func_num
)
1296 #ifdef CONFIG_REGULATOR
1299 * mmc_regulator_get_ocrmask - return mask of supported voltages
1300 * @supply: regulator to use
1302 * This returns either a negative errno, or a mask of voltages that
1303 * can be provided to MMC/SD/SDIO devices using the specified voltage
1304 * regulator. This would normally be called before registering the
1307 int mmc_regulator_get_ocrmask(struct regulator
*supply
)
1315 count
= regulator_count_voltages(supply
);
1319 for (i
= 0; i
< count
; i
++) {
1320 vdd_uV
= regulator_list_voltage(supply
, i
);
1324 vdd_mV
= vdd_uV
/ 1000;
1325 result
|= mmc_vddrange_to_ocrmask(vdd_mV
, vdd_mV
);
1329 vdd_uV
= regulator_get_voltage(supply
);
1333 vdd_mV
= vdd_uV
/ 1000;
1334 result
= mmc_vddrange_to_ocrmask(vdd_mV
, vdd_mV
);
1339 EXPORT_SYMBOL_GPL(mmc_regulator_get_ocrmask
);
1342 * mmc_regulator_set_ocr - set regulator to match host->ios voltage
1343 * @mmc: the host to regulate
1344 * @supply: regulator to use
1345 * @vdd_bit: zero for power off, else a bit number (host->ios.vdd)
1347 * Returns zero on success, else negative errno.
1349 * MMC host drivers may use this to enable or disable a regulator using
1350 * a particular supply voltage. This would normally be called from the
1353 int mmc_regulator_set_ocr(struct mmc_host
*mmc
,
1354 struct regulator
*supply
,
1355 unsigned short vdd_bit
)
1364 * REVISIT mmc_vddrange_to_ocrmask() may have set some
1365 * bits this regulator doesn't quite support ... don't
1366 * be too picky, most cards and regulators are OK with
1367 * a 0.1V range goof (it's a small error percentage).
1369 tmp
= vdd_bit
- ilog2(MMC_VDD_165_195
);
1371 min_uV
= 1650 * 1000;
1372 max_uV
= 1950 * 1000;
1374 min_uV
= 1900 * 1000 + tmp
* 100 * 1000;
1375 max_uV
= min_uV
+ 100 * 1000;
1378 result
= regulator_set_voltage(supply
, min_uV
, max_uV
);
1379 if (result
== 0 && !mmc
->regulator_enabled
) {
1380 result
= regulator_enable(supply
);
1382 mmc
->regulator_enabled
= true;
1384 } else if (mmc
->regulator_enabled
) {
1385 result
= regulator_disable(supply
);
1387 mmc
->regulator_enabled
= false;
1391 dev_err(mmc_dev(mmc
),
1392 "could not set regulator OCR (%d)\n", result
);
1395 EXPORT_SYMBOL_GPL(mmc_regulator_set_ocr
);
1397 #endif /* CONFIG_REGULATOR */
1399 int mmc_regulator_get_supply(struct mmc_host
*mmc
)
1401 struct device
*dev
= mmc_dev(mmc
);
1404 mmc
->supply
.vmmc
= devm_regulator_get_optional(dev
, "vmmc");
1405 mmc
->supply
.vqmmc
= devm_regulator_get_optional(dev
, "vqmmc");
1407 if (IS_ERR(mmc
->supply
.vmmc
)) {
1408 if (PTR_ERR(mmc
->supply
.vmmc
) == -EPROBE_DEFER
)
1409 return -EPROBE_DEFER
;
1410 dev_info(dev
, "No vmmc regulator found\n");
1412 ret
= mmc_regulator_get_ocrmask(mmc
->supply
.vmmc
);
1414 mmc
->ocr_avail
= ret
;
1416 dev_warn(dev
, "Failed getting OCR mask: %d\n", ret
);
1419 if (IS_ERR(mmc
->supply
.vqmmc
)) {
1420 if (PTR_ERR(mmc
->supply
.vqmmc
) == -EPROBE_DEFER
)
1421 return -EPROBE_DEFER
;
1422 dev_info(dev
, "No vqmmc regulator found\n");
1427 EXPORT_SYMBOL_GPL(mmc_regulator_get_supply
);
1430 * Mask off any voltages we don't support and select
1431 * the lowest voltage
1433 u32
mmc_select_voltage(struct mmc_host
*host
, u32 ocr
)
1438 * Sanity check the voltages that the card claims to
1442 dev_warn(mmc_dev(host
),
1443 "card claims to support voltages below defined range\n");
1447 ocr
&= host
->ocr_avail
;
1449 dev_warn(mmc_dev(host
), "no support for card's volts\n");
1453 if (host
->caps2
& MMC_CAP2_FULL_PWR_CYCLE
) {
1456 mmc_power_cycle(host
, ocr
);
1460 if (bit
!= host
->ios
.vdd
)
1461 dev_warn(mmc_dev(host
), "exceeding card's volts\n");
1467 int __mmc_set_signal_voltage(struct mmc_host
*host
, int signal_voltage
)
1470 int old_signal_voltage
= host
->ios
.signal_voltage
;
1472 host
->ios
.signal_voltage
= signal_voltage
;
1473 if (host
->ops
->start_signal_voltage_switch
) {
1474 mmc_host_clk_hold(host
);
1475 err
= host
->ops
->start_signal_voltage_switch(host
, &host
->ios
);
1476 mmc_host_clk_release(host
);
1480 host
->ios
.signal_voltage
= old_signal_voltage
;
1486 int mmc_set_signal_voltage(struct mmc_host
*host
, int signal_voltage
, u32 ocr
)
1488 struct mmc_command cmd
= {0};
1495 * Send CMD11 only if the request is to switch the card to
1498 if (signal_voltage
== MMC_SIGNAL_VOLTAGE_330
)
1499 return __mmc_set_signal_voltage(host
, signal_voltage
);
1502 * If we cannot switch voltages, return failure so the caller
1503 * can continue without UHS mode
1505 if (!host
->ops
->start_signal_voltage_switch
)
1507 if (!host
->ops
->card_busy
)
1508 pr_warn("%s: cannot verify signal voltage switch\n",
1509 mmc_hostname(host
));
1511 mmc_host_clk_hold(host
);
1513 cmd
.opcode
= SD_SWITCH_VOLTAGE
;
1515 cmd
.flags
= MMC_RSP_R1
| MMC_CMD_AC
;
1517 err
= mmc_wait_for_cmd(host
, &cmd
, 0);
1521 if (!mmc_host_is_spi(host
) && (cmd
.resp
[0] & R1_ERROR
)) {
1526 * The card should drive cmd and dat[0:3] low immediately
1527 * after the response of cmd11, but wait 1 ms to be sure
1530 if (host
->ops
->card_busy
&& !host
->ops
->card_busy(host
)) {
1535 * During a signal voltage level switch, the clock must be gated
1536 * for 5 ms according to the SD spec
1538 clock
= host
->ios
.clock
;
1539 host
->ios
.clock
= 0;
1542 if (__mmc_set_signal_voltage(host
, signal_voltage
)) {
1544 * Voltages may not have been switched, but we've already
1545 * sent CMD11, so a power cycle is required anyway
1551 /* Keep clock gated for at least 5 ms */
1553 host
->ios
.clock
= clock
;
1556 /* Wait for at least 1 ms according to spec */
1560 * Failure to switch is indicated by the card holding
1563 if (host
->ops
->card_busy
&& host
->ops
->card_busy(host
))
1568 pr_debug("%s: Signal voltage switch failed, "
1569 "power cycling card\n", mmc_hostname(host
));
1570 mmc_power_cycle(host
, ocr
);
1574 mmc_host_clk_release(host
);
1580 * Select timing parameters for host.
1582 void mmc_set_timing(struct mmc_host
*host
, unsigned int timing
)
1584 mmc_host_clk_hold(host
);
1585 host
->ios
.timing
= timing
;
1587 mmc_host_clk_release(host
);
1591 * Select appropriate driver type for host.
1593 void mmc_set_driver_type(struct mmc_host
*host
, unsigned int drv_type
)
1595 mmc_host_clk_hold(host
);
1596 host
->ios
.drv_type
= drv_type
;
1598 mmc_host_clk_release(host
);
1602 * Apply power to the MMC stack. This is a two-stage process.
1603 * First, we enable power to the card without the clock running.
1604 * We then wait a bit for the power to stabilise. Finally,
1605 * enable the bus drivers and clock to the card.
1607 * We must _NOT_ enable the clock prior to power stablising.
1609 * If a host does all the power sequencing itself, ignore the
1610 * initial MMC_POWER_UP stage.
1612 void mmc_power_up(struct mmc_host
*host
, u32 ocr
)
1614 if (host
->ios
.power_mode
== MMC_POWER_ON
)
1617 mmc_host_clk_hold(host
);
1619 mmc_pwrseq_pre_power_on(host
);
1621 host
->ios
.vdd
= fls(ocr
) - 1;
1622 host
->ios
.power_mode
= MMC_POWER_UP
;
1623 /* Set initial state and call mmc_set_ios */
1624 mmc_set_initial_state(host
);
1626 /* Try to set signal voltage to 3.3V but fall back to 1.8v or 1.2v */
1627 if (__mmc_set_signal_voltage(host
, MMC_SIGNAL_VOLTAGE_330
) == 0)
1628 dev_dbg(mmc_dev(host
), "Initial signal voltage of 3.3v\n");
1629 else if (__mmc_set_signal_voltage(host
, MMC_SIGNAL_VOLTAGE_180
) == 0)
1630 dev_dbg(mmc_dev(host
), "Initial signal voltage of 1.8v\n");
1631 else if (__mmc_set_signal_voltage(host
, MMC_SIGNAL_VOLTAGE_120
) == 0)
1632 dev_dbg(mmc_dev(host
), "Initial signal voltage of 1.2v\n");
1635 * This delay should be sufficient to allow the power supply
1636 * to reach the minimum voltage.
1640 host
->ios
.clock
= host
->f_init
;
1642 host
->ios
.power_mode
= MMC_POWER_ON
;
1646 * This delay must be at least 74 clock sizes, or 1 ms, or the
1647 * time required to reach a stable voltage.
1651 mmc_pwrseq_post_power_on(host
);
1653 mmc_host_clk_release(host
);
1656 void mmc_power_off(struct mmc_host
*host
)
1658 if (host
->ios
.power_mode
== MMC_POWER_OFF
)
1661 mmc_host_clk_hold(host
);
1663 mmc_pwrseq_power_off(host
);
1665 host
->ios
.clock
= 0;
1668 host
->ios
.power_mode
= MMC_POWER_OFF
;
1669 /* Set initial state and call mmc_set_ios */
1670 mmc_set_initial_state(host
);
1673 * Some configurations, such as the 802.11 SDIO card in the OLPC
1674 * XO-1.5, require a short delay after poweroff before the card
1675 * can be successfully turned on again.
1679 mmc_host_clk_release(host
);
1682 void mmc_power_cycle(struct mmc_host
*host
, u32 ocr
)
1684 mmc_power_off(host
);
1685 /* Wait at least 1 ms according to SD spec */
1687 mmc_power_up(host
, ocr
);
1691 * Cleanup when the last reference to the bus operator is dropped.
1693 static void __mmc_release_bus(struct mmc_host
*host
)
1696 BUG_ON(host
->bus_refs
);
1697 BUG_ON(!host
->bus_dead
);
1699 host
->bus_ops
= NULL
;
1703 * Increase reference count of bus operator
1705 static inline void mmc_bus_get(struct mmc_host
*host
)
1707 unsigned long flags
;
1709 spin_lock_irqsave(&host
->lock
, flags
);
1711 spin_unlock_irqrestore(&host
->lock
, flags
);
1715 * Decrease reference count of bus operator and free it if
1716 * it is the last reference.
1718 static inline void mmc_bus_put(struct mmc_host
*host
)
1720 unsigned long flags
;
1722 spin_lock_irqsave(&host
->lock
, flags
);
1724 if ((host
->bus_refs
== 0) && host
->bus_ops
)
1725 __mmc_release_bus(host
);
1726 spin_unlock_irqrestore(&host
->lock
, flags
);
1730 * Assign a mmc bus handler to a host. Only one bus handler may control a
1731 * host at any given time.
1733 void mmc_attach_bus(struct mmc_host
*host
, const struct mmc_bus_ops
*ops
)
1735 unsigned long flags
;
1740 WARN_ON(!host
->claimed
);
1742 spin_lock_irqsave(&host
->lock
, flags
);
1744 BUG_ON(host
->bus_ops
);
1745 BUG_ON(host
->bus_refs
);
1747 host
->bus_ops
= ops
;
1751 spin_unlock_irqrestore(&host
->lock
, flags
);
1755 * Remove the current bus handler from a host.
1757 void mmc_detach_bus(struct mmc_host
*host
)
1759 unsigned long flags
;
1763 WARN_ON(!host
->claimed
);
1764 WARN_ON(!host
->bus_ops
);
1766 spin_lock_irqsave(&host
->lock
, flags
);
1770 spin_unlock_irqrestore(&host
->lock
, flags
);
1775 static void _mmc_detect_change(struct mmc_host
*host
, unsigned long delay
,
1778 #ifdef CONFIG_MMC_DEBUG
1779 unsigned long flags
;
1780 spin_lock_irqsave(&host
->lock
, flags
);
1781 WARN_ON(host
->removed
);
1782 spin_unlock_irqrestore(&host
->lock
, flags
);
1786 * If the device is configured as wakeup, we prevent a new sleep for
1787 * 5 s to give provision for user space to consume the event.
1789 if (cd_irq
&& !(host
->caps
& MMC_CAP_NEEDS_POLL
) &&
1790 device_can_wakeup(mmc_dev(host
)))
1791 pm_wakeup_event(mmc_dev(host
), 5000);
1793 host
->detect_change
= 1;
1794 mmc_schedule_delayed_work(&host
->detect
, delay
);
1798 * mmc_detect_change - process change of state on a MMC socket
1799 * @host: host which changed state.
1800 * @delay: optional delay to wait before detection (jiffies)
1802 * MMC drivers should call this when they detect a card has been
1803 * inserted or removed. The MMC layer will confirm that any
1804 * present card is still functional, and initialize any newly
1807 void mmc_detect_change(struct mmc_host
*host
, unsigned long delay
)
1809 _mmc_detect_change(host
, delay
, true);
1811 EXPORT_SYMBOL(mmc_detect_change
);
1813 void mmc_init_erase(struct mmc_card
*card
)
1817 if (is_power_of_2(card
->erase_size
))
1818 card
->erase_shift
= ffs(card
->erase_size
) - 1;
1820 card
->erase_shift
= 0;
1823 * It is possible to erase an arbitrarily large area of an SD or MMC
1824 * card. That is not desirable because it can take a long time
1825 * (minutes) potentially delaying more important I/O, and also the
1826 * timeout calculations become increasingly hugely over-estimated.
1827 * Consequently, 'pref_erase' is defined as a guide to limit erases
1828 * to that size and alignment.
1830 * For SD cards that define Allocation Unit size, limit erases to one
1831 * Allocation Unit at a time. For MMC cards that define High Capacity
1832 * Erase Size, whether it is switched on or not, limit to that size.
1833 * Otherwise just have a stab at a good value. For modern cards it
1834 * will end up being 4MiB. Note that if the value is too small, it
1835 * can end up taking longer to erase.
1837 if (mmc_card_sd(card
) && card
->ssr
.au
) {
1838 card
->pref_erase
= card
->ssr
.au
;
1839 card
->erase_shift
= ffs(card
->ssr
.au
) - 1;
1840 } else if (card
->ext_csd
.hc_erase_size
) {
1841 card
->pref_erase
= card
->ext_csd
.hc_erase_size
;
1842 } else if (card
->erase_size
) {
1843 sz
= (card
->csd
.capacity
<< (card
->csd
.read_blkbits
- 9)) >> 11;
1845 card
->pref_erase
= 512 * 1024 / 512;
1847 card
->pref_erase
= 1024 * 1024 / 512;
1849 card
->pref_erase
= 2 * 1024 * 1024 / 512;
1851 card
->pref_erase
= 4 * 1024 * 1024 / 512;
1852 if (card
->pref_erase
< card
->erase_size
)
1853 card
->pref_erase
= card
->erase_size
;
1855 sz
= card
->pref_erase
% card
->erase_size
;
1857 card
->pref_erase
+= card
->erase_size
- sz
;
1860 card
->pref_erase
= 0;
1863 static unsigned int mmc_mmc_erase_timeout(struct mmc_card
*card
,
1864 unsigned int arg
, unsigned int qty
)
1866 unsigned int erase_timeout
;
1868 if (arg
== MMC_DISCARD_ARG
||
1869 (arg
== MMC_TRIM_ARG
&& card
->ext_csd
.rev
>= 6)) {
1870 erase_timeout
= card
->ext_csd
.trim_timeout
;
1871 } else if (card
->ext_csd
.erase_group_def
& 1) {
1872 /* High Capacity Erase Group Size uses HC timeouts */
1873 if (arg
== MMC_TRIM_ARG
)
1874 erase_timeout
= card
->ext_csd
.trim_timeout
;
1876 erase_timeout
= card
->ext_csd
.hc_erase_timeout
;
1878 /* CSD Erase Group Size uses write timeout */
1879 unsigned int mult
= (10 << card
->csd
.r2w_factor
);
1880 unsigned int timeout_clks
= card
->csd
.tacc_clks
* mult
;
1881 unsigned int timeout_us
;
1883 /* Avoid overflow: e.g. tacc_ns=80000000 mult=1280 */
1884 if (card
->csd
.tacc_ns
< 1000000)
1885 timeout_us
= (card
->csd
.tacc_ns
* mult
) / 1000;
1887 timeout_us
= (card
->csd
.tacc_ns
/ 1000) * mult
;
1890 * ios.clock is only a target. The real clock rate might be
1891 * less but not that much less, so fudge it by multiplying by 2.
1894 timeout_us
+= (timeout_clks
* 1000) /
1895 (mmc_host_clk_rate(card
->host
) / 1000);
1897 erase_timeout
= timeout_us
/ 1000;
1900 * Theoretically, the calculation could underflow so round up
1901 * to 1ms in that case.
1907 /* Multiplier for secure operations */
1908 if (arg
& MMC_SECURE_ARGS
) {
1909 if (arg
== MMC_SECURE_ERASE_ARG
)
1910 erase_timeout
*= card
->ext_csd
.sec_erase_mult
;
1912 erase_timeout
*= card
->ext_csd
.sec_trim_mult
;
1915 erase_timeout
*= qty
;
1918 * Ensure at least a 1 second timeout for SPI as per
1919 * 'mmc_set_data_timeout()'
1921 if (mmc_host_is_spi(card
->host
) && erase_timeout
< 1000)
1922 erase_timeout
= 1000;
1924 return erase_timeout
;
1927 static unsigned int mmc_sd_erase_timeout(struct mmc_card
*card
,
1931 unsigned int erase_timeout
;
1933 if (card
->ssr
.erase_timeout
) {
1934 /* Erase timeout specified in SD Status Register (SSR) */
1935 erase_timeout
= card
->ssr
.erase_timeout
* qty
+
1936 card
->ssr
.erase_offset
;
1939 * Erase timeout not specified in SD Status Register (SSR) so
1940 * use 250ms per write block.
1942 erase_timeout
= 250 * qty
;
1945 /* Must not be less than 1 second */
1946 if (erase_timeout
< 1000)
1947 erase_timeout
= 1000;
1949 return erase_timeout
;
1952 static unsigned int mmc_erase_timeout(struct mmc_card
*card
,
1956 if (mmc_card_sd(card
))
1957 return mmc_sd_erase_timeout(card
, arg
, qty
);
1959 return mmc_mmc_erase_timeout(card
, arg
, qty
);
1962 static int mmc_do_erase(struct mmc_card
*card
, unsigned int from
,
1963 unsigned int to
, unsigned int arg
)
1965 struct mmc_command cmd
= {0};
1966 unsigned int qty
= 0;
1967 unsigned long timeout
;
1971 * qty is used to calculate the erase timeout which depends on how many
1972 * erase groups (or allocation units in SD terminology) are affected.
1973 * We count erasing part of an erase group as one erase group.
1974 * For SD, the allocation units are always a power of 2. For MMC, the
1975 * erase group size is almost certainly also power of 2, but it does not
1976 * seem to insist on that in the JEDEC standard, so we fall back to
1977 * division in that case. SD may not specify an allocation unit size,
1978 * in which case the timeout is based on the number of write blocks.
1980 * Note that the timeout for secure trim 2 will only be correct if the
1981 * number of erase groups specified is the same as the total of all
1982 * preceding secure trim 1 commands. Since the power may have been
1983 * lost since the secure trim 1 commands occurred, it is generally
1984 * impossible to calculate the secure trim 2 timeout correctly.
1986 if (card
->erase_shift
)
1987 qty
+= ((to
>> card
->erase_shift
) -
1988 (from
>> card
->erase_shift
)) + 1;
1989 else if (mmc_card_sd(card
))
1990 qty
+= to
- from
+ 1;
1992 qty
+= ((to
/ card
->erase_size
) -
1993 (from
/ card
->erase_size
)) + 1;
1995 if (!mmc_card_blockaddr(card
)) {
2000 if (mmc_card_sd(card
))
2001 cmd
.opcode
= SD_ERASE_WR_BLK_START
;
2003 cmd
.opcode
= MMC_ERASE_GROUP_START
;
2005 cmd
.flags
= MMC_RSP_SPI_R1
| MMC_RSP_R1
| MMC_CMD_AC
;
2006 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 0);
2008 pr_err("mmc_erase: group start error %d, "
2009 "status %#x\n", err
, cmd
.resp
[0]);
2014 memset(&cmd
, 0, sizeof(struct mmc_command
));
2015 if (mmc_card_sd(card
))
2016 cmd
.opcode
= SD_ERASE_WR_BLK_END
;
2018 cmd
.opcode
= MMC_ERASE_GROUP_END
;
2020 cmd
.flags
= MMC_RSP_SPI_R1
| MMC_RSP_R1
| MMC_CMD_AC
;
2021 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 0);
2023 pr_err("mmc_erase: group end error %d, status %#x\n",
2029 memset(&cmd
, 0, sizeof(struct mmc_command
));
2030 cmd
.opcode
= MMC_ERASE
;
2032 cmd
.flags
= MMC_RSP_SPI_R1B
| MMC_RSP_R1B
| MMC_CMD_AC
;
2033 cmd
.busy_timeout
= mmc_erase_timeout(card
, arg
, qty
);
2034 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 0);
2036 pr_err("mmc_erase: erase error %d, status %#x\n",
2042 if (mmc_host_is_spi(card
->host
))
2045 timeout
= jiffies
+ msecs_to_jiffies(MMC_CORE_TIMEOUT_MS
);
2047 memset(&cmd
, 0, sizeof(struct mmc_command
));
2048 cmd
.opcode
= MMC_SEND_STATUS
;
2049 cmd
.arg
= card
->rca
<< 16;
2050 cmd
.flags
= MMC_RSP_R1
| MMC_CMD_AC
;
2051 /* Do not retry else we can't see errors */
2052 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 0);
2053 if (err
|| (cmd
.resp
[0] & 0xFDF92000)) {
2054 pr_err("error %d requesting status %#x\n",
2060 /* Timeout if the device never becomes ready for data and
2061 * never leaves the program state.
2063 if (time_after(jiffies
, timeout
)) {
2064 pr_err("%s: Card stuck in programming state! %s\n",
2065 mmc_hostname(card
->host
), __func__
);
2070 } while (!(cmd
.resp
[0] & R1_READY_FOR_DATA
) ||
2071 (R1_CURRENT_STATE(cmd
.resp
[0]) == R1_STATE_PRG
));
2077 * mmc_erase - erase sectors.
2078 * @card: card to erase
2079 * @from: first sector to erase
2080 * @nr: number of sectors to erase
2081 * @arg: erase command argument (SD supports only %MMC_ERASE_ARG)
2083 * Caller must claim host before calling this function.
2085 int mmc_erase(struct mmc_card
*card
, unsigned int from
, unsigned int nr
,
2088 unsigned int rem
, to
= from
+ nr
;
2090 if (!(card
->host
->caps
& MMC_CAP_ERASE
) ||
2091 !(card
->csd
.cmdclass
& CCC_ERASE
))
2094 if (!card
->erase_size
)
2097 if (mmc_card_sd(card
) && arg
!= MMC_ERASE_ARG
)
2100 if ((arg
& MMC_SECURE_ARGS
) &&
2101 !(card
->ext_csd
.sec_feature_support
& EXT_CSD_SEC_ER_EN
))
2104 if ((arg
& MMC_TRIM_ARGS
) &&
2105 !(card
->ext_csd
.sec_feature_support
& EXT_CSD_SEC_GB_CL_EN
))
2108 if (arg
== MMC_SECURE_ERASE_ARG
) {
2109 if (from
% card
->erase_size
|| nr
% card
->erase_size
)
2113 if (arg
== MMC_ERASE_ARG
) {
2114 rem
= from
% card
->erase_size
;
2116 rem
= card
->erase_size
- rem
;
2123 rem
= nr
% card
->erase_size
;
2136 /* 'from' and 'to' are inclusive */
2139 return mmc_do_erase(card
, from
, to
, arg
);
2141 EXPORT_SYMBOL(mmc_erase
);
2143 int mmc_can_erase(struct mmc_card
*card
)
2145 if ((card
->host
->caps
& MMC_CAP_ERASE
) &&
2146 (card
->csd
.cmdclass
& CCC_ERASE
) && card
->erase_size
)
2150 EXPORT_SYMBOL(mmc_can_erase
);
2152 int mmc_can_trim(struct mmc_card
*card
)
2154 if (card
->ext_csd
.sec_feature_support
& EXT_CSD_SEC_GB_CL_EN
)
2158 EXPORT_SYMBOL(mmc_can_trim
);
2160 int mmc_can_discard(struct mmc_card
*card
)
2163 * As there's no way to detect the discard support bit at v4.5
2164 * use the s/w feature support filed.
2166 if (card
->ext_csd
.feature_support
& MMC_DISCARD_FEATURE
)
2170 EXPORT_SYMBOL(mmc_can_discard
);
2172 int mmc_can_sanitize(struct mmc_card
*card
)
2174 if (!mmc_can_trim(card
) && !mmc_can_erase(card
))
2176 if (card
->ext_csd
.sec_feature_support
& EXT_CSD_SEC_SANITIZE
)
2180 EXPORT_SYMBOL(mmc_can_sanitize
);
2182 int mmc_can_secure_erase_trim(struct mmc_card
*card
)
2184 if ((card
->ext_csd
.sec_feature_support
& EXT_CSD_SEC_ER_EN
) &&
2185 !(card
->quirks
& MMC_QUIRK_SEC_ERASE_TRIM_BROKEN
))
2189 EXPORT_SYMBOL(mmc_can_secure_erase_trim
);
2191 int mmc_erase_group_aligned(struct mmc_card
*card
, unsigned int from
,
2194 if (!card
->erase_size
)
2196 if (from
% card
->erase_size
|| nr
% card
->erase_size
)
2200 EXPORT_SYMBOL(mmc_erase_group_aligned
);
2202 static unsigned int mmc_do_calc_max_discard(struct mmc_card
*card
,
2205 struct mmc_host
*host
= card
->host
;
2206 unsigned int max_discard
, x
, y
, qty
= 0, max_qty
, timeout
;
2207 unsigned int last_timeout
= 0;
2209 if (card
->erase_shift
)
2210 max_qty
= UINT_MAX
>> card
->erase_shift
;
2211 else if (mmc_card_sd(card
))
2214 max_qty
= UINT_MAX
/ card
->erase_size
;
2216 /* Find the largest qty with an OK timeout */
2219 for (x
= 1; x
&& x
<= max_qty
&& max_qty
- x
>= qty
; x
<<= 1) {
2220 timeout
= mmc_erase_timeout(card
, arg
, qty
+ x
);
2221 if (timeout
> host
->max_busy_timeout
)
2223 if (timeout
< last_timeout
)
2225 last_timeout
= timeout
;
2237 /* Convert qty to sectors */
2238 if (card
->erase_shift
)
2239 max_discard
= --qty
<< card
->erase_shift
;
2240 else if (mmc_card_sd(card
))
2243 max_discard
= --qty
* card
->erase_size
;
2248 unsigned int mmc_calc_max_discard(struct mmc_card
*card
)
2250 struct mmc_host
*host
= card
->host
;
2251 unsigned int max_discard
, max_trim
;
2253 if (!host
->max_busy_timeout
)
2257 * Without erase_group_def set, MMC erase timeout depends on clock
2258 * frequence which can change. In that case, the best choice is
2259 * just the preferred erase size.
2261 if (mmc_card_mmc(card
) && !(card
->ext_csd
.erase_group_def
& 1))
2262 return card
->pref_erase
;
2264 max_discard
= mmc_do_calc_max_discard(card
, MMC_ERASE_ARG
);
2265 if (mmc_can_trim(card
)) {
2266 max_trim
= mmc_do_calc_max_discard(card
, MMC_TRIM_ARG
);
2267 if (max_trim
< max_discard
)
2268 max_discard
= max_trim
;
2269 } else if (max_discard
< card
->erase_size
) {
2272 pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n",
2273 mmc_hostname(host
), max_discard
, host
->max_busy_timeout
);
2276 EXPORT_SYMBOL(mmc_calc_max_discard
);
2278 int mmc_set_blocklen(struct mmc_card
*card
, unsigned int blocklen
)
2280 struct mmc_command cmd
= {0};
2282 if (mmc_card_blockaddr(card
) || mmc_card_ddr52(card
))
2285 cmd
.opcode
= MMC_SET_BLOCKLEN
;
2287 cmd
.flags
= MMC_RSP_SPI_R1
| MMC_RSP_R1
| MMC_CMD_AC
;
2288 return mmc_wait_for_cmd(card
->host
, &cmd
, 5);
2290 EXPORT_SYMBOL(mmc_set_blocklen
);
2292 int mmc_set_blockcount(struct mmc_card
*card
, unsigned int blockcount
,
2295 struct mmc_command cmd
= {0};
2297 cmd
.opcode
= MMC_SET_BLOCK_COUNT
;
2298 cmd
.arg
= blockcount
& 0x0000FFFF;
2301 cmd
.flags
= MMC_RSP_SPI_R1
| MMC_RSP_R1
| MMC_CMD_AC
;
2302 return mmc_wait_for_cmd(card
->host
, &cmd
, 5);
2304 EXPORT_SYMBOL(mmc_set_blockcount
);
2306 static void mmc_hw_reset_for_init(struct mmc_host
*host
)
2308 if (!(host
->caps
& MMC_CAP_HW_RESET
) || !host
->ops
->hw_reset
)
2310 mmc_host_clk_hold(host
);
2311 host
->ops
->hw_reset(host
);
2312 mmc_host_clk_release(host
);
2315 int mmc_hw_reset(struct mmc_host
*host
)
2323 if (!host
->bus_ops
|| host
->bus_dead
|| !host
->bus_ops
->reset
) {
2328 ret
= host
->bus_ops
->reset(host
);
2331 pr_warn("%s: tried to reset card\n", mmc_hostname(host
));
2335 EXPORT_SYMBOL(mmc_hw_reset
);
2337 static int mmc_rescan_try_freq(struct mmc_host
*host
, unsigned freq
)
2339 host
->f_init
= freq
;
2341 #ifdef CONFIG_MMC_DEBUG
2342 pr_info("%s: %s: trying to init card at %u Hz\n",
2343 mmc_hostname(host
), __func__
, host
->f_init
);
2345 mmc_power_up(host
, host
->ocr_avail
);
2348 * Some eMMCs (with VCCQ always on) may not be reset after power up, so
2349 * do a hardware reset if possible.
2351 mmc_hw_reset_for_init(host
);
2354 * sdio_reset sends CMD52 to reset card. Since we do not know
2355 * if the card is being re-initialized, just send it. CMD52
2356 * should be ignored by SD/eMMC cards.
2361 mmc_send_if_cond(host
, host
->ocr_avail
);
2363 /* Order's important: probe SDIO, then SD, then MMC */
2364 if (!mmc_attach_sdio(host
))
2366 if (!mmc_attach_sd(host
))
2368 if (!mmc_attach_mmc(host
))
2371 mmc_power_off(host
);
2375 int _mmc_detect_card_removed(struct mmc_host
*host
)
2379 if (host
->caps
& MMC_CAP_NONREMOVABLE
)
2382 if (!host
->card
|| mmc_card_removed(host
->card
))
2385 ret
= host
->bus_ops
->alive(host
);
2388 * Card detect status and alive check may be out of sync if card is
2389 * removed slowly, when card detect switch changes while card/slot
2390 * pads are still contacted in hardware (refer to "SD Card Mechanical
2391 * Addendum, Appendix C: Card Detection Switch"). So reschedule a
2392 * detect work 200ms later for this case.
2394 if (!ret
&& host
->ops
->get_cd
&& !host
->ops
->get_cd(host
)) {
2395 mmc_detect_change(host
, msecs_to_jiffies(200));
2396 pr_debug("%s: card removed too slowly\n", mmc_hostname(host
));
2400 mmc_card_set_removed(host
->card
);
2401 pr_debug("%s: card remove detected\n", mmc_hostname(host
));
2407 int mmc_detect_card_removed(struct mmc_host
*host
)
2409 struct mmc_card
*card
= host
->card
;
2412 WARN_ON(!host
->claimed
);
2417 ret
= mmc_card_removed(card
);
2419 * The card will be considered unchanged unless we have been asked to
2420 * detect a change or host requires polling to provide card detection.
2422 if (!host
->detect_change
&& !(host
->caps
& MMC_CAP_NEEDS_POLL
))
2425 host
->detect_change
= 0;
2427 ret
= _mmc_detect_card_removed(host
);
2428 if (ret
&& (host
->caps
& MMC_CAP_NEEDS_POLL
)) {
2430 * Schedule a detect work as soon as possible to let a
2431 * rescan handle the card removal.
2433 cancel_delayed_work(&host
->detect
);
2434 _mmc_detect_change(host
, 0, false);
2440 EXPORT_SYMBOL(mmc_detect_card_removed
);
2442 void mmc_rescan(struct work_struct
*work
)
2444 struct mmc_host
*host
=
2445 container_of(work
, struct mmc_host
, detect
.work
);
2448 if (host
->trigger_card_event
&& host
->ops
->card_event
) {
2449 host
->ops
->card_event(host
);
2450 host
->trigger_card_event
= false;
2453 if (host
->rescan_disable
)
2456 /* If there is a non-removable card registered, only scan once */
2457 if ((host
->caps
& MMC_CAP_NONREMOVABLE
) && host
->rescan_entered
)
2459 host
->rescan_entered
= 1;
2464 * if there is a _removable_ card registered, check whether it is
2467 if (host
->bus_ops
&& !host
->bus_dead
2468 && !(host
->caps
& MMC_CAP_NONREMOVABLE
))
2469 host
->bus_ops
->detect(host
);
2471 host
->detect_change
= 0;
2474 * Let mmc_bus_put() free the bus/bus_ops if we've found that
2475 * the card is no longer present.
2480 /* if there still is a card present, stop here */
2481 if (host
->bus_ops
!= NULL
) {
2487 * Only we can add a new handler, so it's safe to
2488 * release the lock here.
2492 if (!(host
->caps
& MMC_CAP_NONREMOVABLE
) && host
->ops
->get_cd
&&
2493 host
->ops
->get_cd(host
) == 0) {
2494 mmc_claim_host(host
);
2495 mmc_power_off(host
);
2496 mmc_release_host(host
);
2500 mmc_claim_host(host
);
2501 for (i
= 0; i
< ARRAY_SIZE(freqs
); i
++) {
2502 if (!mmc_rescan_try_freq(host
, max(freqs
[i
], host
->f_min
)))
2504 if (freqs
[i
] <= host
->f_min
)
2507 mmc_release_host(host
);
2510 if (host
->caps
& MMC_CAP_NEEDS_POLL
)
2511 mmc_schedule_delayed_work(&host
->detect
, HZ
);
2514 void mmc_start_host(struct mmc_host
*host
)
2516 host
->f_init
= max(freqs
[0], host
->f_min
);
2517 host
->rescan_disable
= 0;
2518 host
->ios
.power_mode
= MMC_POWER_UNDEFINED
;
2519 if (host
->caps2
& MMC_CAP2_NO_PRESCAN_POWERUP
)
2520 mmc_power_off(host
);
2522 mmc_power_up(host
, host
->ocr_avail
);
2523 mmc_gpiod_request_cd_irq(host
);
2524 _mmc_detect_change(host
, 0, false);
2527 void mmc_stop_host(struct mmc_host
*host
)
2529 #ifdef CONFIG_MMC_DEBUG
2530 unsigned long flags
;
2531 spin_lock_irqsave(&host
->lock
, flags
);
2533 spin_unlock_irqrestore(&host
->lock
, flags
);
2535 if (host
->slot
.cd_irq
>= 0)
2536 disable_irq(host
->slot
.cd_irq
);
2538 host
->rescan_disable
= 1;
2539 cancel_delayed_work_sync(&host
->detect
);
2540 mmc_flush_scheduled_work();
2542 /* clear pm flags now and let card drivers set them as needed */
2546 if (host
->bus_ops
&& !host
->bus_dead
) {
2547 /* Calling bus_ops->remove() with a claimed host can deadlock */
2548 host
->bus_ops
->remove(host
);
2549 mmc_claim_host(host
);
2550 mmc_detach_bus(host
);
2551 mmc_power_off(host
);
2552 mmc_release_host(host
);
2560 mmc_power_off(host
);
2563 int mmc_power_save_host(struct mmc_host
*host
)
2567 #ifdef CONFIG_MMC_DEBUG
2568 pr_info("%s: %s: powering down\n", mmc_hostname(host
), __func__
);
2573 if (!host
->bus_ops
|| host
->bus_dead
) {
2578 if (host
->bus_ops
->power_save
)
2579 ret
= host
->bus_ops
->power_save(host
);
2583 mmc_power_off(host
);
2587 EXPORT_SYMBOL(mmc_power_save_host
);
2589 int mmc_power_restore_host(struct mmc_host
*host
)
2593 #ifdef CONFIG_MMC_DEBUG
2594 pr_info("%s: %s: powering up\n", mmc_hostname(host
), __func__
);
2599 if (!host
->bus_ops
|| host
->bus_dead
) {
2604 mmc_power_up(host
, host
->card
->ocr
);
2605 ret
= host
->bus_ops
->power_restore(host
);
2611 EXPORT_SYMBOL(mmc_power_restore_host
);
2614 * Flush the cache to the non-volatile storage.
2616 int mmc_flush_cache(struct mmc_card
*card
)
2620 if (mmc_card_mmc(card
) &&
2621 (card
->ext_csd
.cache_size
> 0) &&
2622 (card
->ext_csd
.cache_ctrl
& 1)) {
2623 err
= mmc_switch(card
, EXT_CSD_CMD_SET_NORMAL
,
2624 EXT_CSD_FLUSH_CACHE
, 1, 0);
2626 pr_err("%s: cache flush error %d\n",
2627 mmc_hostname(card
->host
), err
);
2632 EXPORT_SYMBOL(mmc_flush_cache
);
2636 /* Do the card removal on suspend if card is assumed removeable
2637 * Do that in pm notifier while userspace isn't yet frozen, so we will be able
2640 int mmc_pm_notify(struct notifier_block
*notify_block
,
2641 unsigned long mode
, void *unused
)
2643 struct mmc_host
*host
= container_of(
2644 notify_block
, struct mmc_host
, pm_notify
);
2645 unsigned long flags
;
2649 case PM_HIBERNATION_PREPARE
:
2650 case PM_SUSPEND_PREPARE
:
2651 spin_lock_irqsave(&host
->lock
, flags
);
2652 host
->rescan_disable
= 1;
2653 spin_unlock_irqrestore(&host
->lock
, flags
);
2654 cancel_delayed_work_sync(&host
->detect
);
2659 /* Validate prerequisites for suspend */
2660 if (host
->bus_ops
->pre_suspend
)
2661 err
= host
->bus_ops
->pre_suspend(host
);
2665 /* Calling bus_ops->remove() with a claimed host can deadlock */
2666 host
->bus_ops
->remove(host
);
2667 mmc_claim_host(host
);
2668 mmc_detach_bus(host
);
2669 mmc_power_off(host
);
2670 mmc_release_host(host
);
2674 case PM_POST_SUSPEND
:
2675 case PM_POST_HIBERNATION
:
2676 case PM_POST_RESTORE
:
2678 spin_lock_irqsave(&host
->lock
, flags
);
2679 host
->rescan_disable
= 0;
2680 spin_unlock_irqrestore(&host
->lock
, flags
);
2681 _mmc_detect_change(host
, 0, false);
2690 * mmc_init_context_info() - init synchronization context
2693 * Init struct context_info needed to implement asynchronous
2694 * request mechanism, used by mmc core, host driver and mmc requests
2697 void mmc_init_context_info(struct mmc_host
*host
)
2699 spin_lock_init(&host
->context_info
.lock
);
2700 host
->context_info
.is_new_req
= false;
2701 host
->context_info
.is_done_rcv
= false;
2702 host
->context_info
.is_waiting_last_req
= false;
2703 init_waitqueue_head(&host
->context_info
.wait
);
2706 static int __init
mmc_init(void)
2710 workqueue
= alloc_ordered_workqueue("kmmcd", 0);
2714 ret
= mmc_register_bus();
2716 goto destroy_workqueue
;
2718 ret
= mmc_register_host_class();
2720 goto unregister_bus
;
2722 ret
= sdio_register_bus();
2724 goto unregister_host_class
;
2728 unregister_host_class
:
2729 mmc_unregister_host_class();
2731 mmc_unregister_bus();
2733 destroy_workqueue(workqueue
);
2738 static void __exit
mmc_exit(void)
2740 sdio_unregister_bus();
2741 mmc_unregister_host_class();
2742 mmc_unregister_bus();
2743 destroy_workqueue(workqueue
);
2746 subsys_initcall(mmc_init
);
2747 module_exit(mmc_exit
);
2749 MODULE_LICENSE("GPL");