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>
48 /* If the device is not responding */
49 #define MMC_CORE_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute timeout */
52 * Background operations can take a long time, depending on the housekeeping
53 * operations the card has to perform.
55 #define MMC_BKOPS_MAX_TIMEOUT (4 * 60 * 1000) /* max time to wait in ms */
57 static struct workqueue_struct
*workqueue
;
58 static const unsigned freqs
[] = { 400000, 300000, 200000, 100000 };
61 * Enabling software CRCs on the data blocks can be a significant (30%)
62 * performance cost, and for other reasons may not always be desired.
63 * So we allow it it to be disabled.
66 module_param(use_spi_crc
, bool, 0);
69 * Internal function. Schedule delayed work in the MMC work queue.
71 static int mmc_schedule_delayed_work(struct delayed_work
*work
,
74 return queue_delayed_work(workqueue
, work
, delay
);
78 * Internal function. Flush all scheduled work from the MMC work queue.
80 static void mmc_flush_scheduled_work(void)
82 flush_workqueue(workqueue
);
85 #ifdef CONFIG_FAIL_MMC_REQUEST
88 * Internal function. Inject random data errors.
89 * If mmc_data is NULL no errors are injected.
91 static void mmc_should_fail_request(struct mmc_host
*host
,
92 struct mmc_request
*mrq
)
94 struct mmc_command
*cmd
= mrq
->cmd
;
95 struct mmc_data
*data
= mrq
->data
;
96 static const int data_errors
[] = {
105 if (cmd
->error
|| data
->error
||
106 !should_fail(&host
->fail_mmc_request
, data
->blksz
* data
->blocks
))
109 data
->error
= data_errors
[prandom_u32() % ARRAY_SIZE(data_errors
)];
110 data
->bytes_xfered
= (prandom_u32() % (data
->bytes_xfered
>> 9)) << 9;
113 #else /* CONFIG_FAIL_MMC_REQUEST */
115 static inline void mmc_should_fail_request(struct mmc_host
*host
,
116 struct mmc_request
*mrq
)
120 #endif /* CONFIG_FAIL_MMC_REQUEST */
123 * mmc_request_done - finish processing an MMC request
124 * @host: MMC host which completed request
125 * @mrq: MMC request which request
127 * MMC drivers should call this function when they have completed
128 * their processing of a request.
130 void mmc_request_done(struct mmc_host
*host
, struct mmc_request
*mrq
)
132 struct mmc_command
*cmd
= mrq
->cmd
;
133 int err
= cmd
->error
;
135 if (err
&& cmd
->retries
&& mmc_host_is_spi(host
)) {
136 if (cmd
->resp
[0] & R1_SPI_ILLEGAL_COMMAND
)
140 if (err
&& cmd
->retries
&& !mmc_card_removed(host
->card
)) {
142 * Request starter must handle retries - see
143 * mmc_wait_for_req_done().
148 mmc_should_fail_request(host
, mrq
);
150 led_trigger_event(host
->led
, LED_OFF
);
152 pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n",
153 mmc_hostname(host
), cmd
->opcode
, err
,
154 cmd
->resp
[0], cmd
->resp
[1],
155 cmd
->resp
[2], cmd
->resp
[3]);
158 pr_debug("%s: %d bytes transferred: %d\n",
160 mrq
->data
->bytes_xfered
, mrq
->data
->error
);
164 pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n",
165 mmc_hostname(host
), mrq
->stop
->opcode
,
167 mrq
->stop
->resp
[0], mrq
->stop
->resp
[1],
168 mrq
->stop
->resp
[2], mrq
->stop
->resp
[3]);
174 mmc_host_clk_release(host
);
178 EXPORT_SYMBOL(mmc_request_done
);
181 mmc_start_request(struct mmc_host
*host
, struct mmc_request
*mrq
)
183 #ifdef CONFIG_MMC_DEBUG
185 struct scatterlist
*sg
;
189 pr_debug("<%s: starting CMD%u arg %08x flags %08x>\n",
190 mmc_hostname(host
), mrq
->sbc
->opcode
,
191 mrq
->sbc
->arg
, mrq
->sbc
->flags
);
194 pr_debug("%s: starting CMD%u arg %08x flags %08x\n",
195 mmc_hostname(host
), mrq
->cmd
->opcode
,
196 mrq
->cmd
->arg
, mrq
->cmd
->flags
);
199 pr_debug("%s: blksz %d blocks %d flags %08x "
200 "tsac %d ms nsac %d\n",
201 mmc_hostname(host
), mrq
->data
->blksz
,
202 mrq
->data
->blocks
, mrq
->data
->flags
,
203 mrq
->data
->timeout_ns
/ 1000000,
204 mrq
->data
->timeout_clks
);
208 pr_debug("%s: CMD%u arg %08x flags %08x\n",
209 mmc_hostname(host
), mrq
->stop
->opcode
,
210 mrq
->stop
->arg
, mrq
->stop
->flags
);
213 WARN_ON(!host
->claimed
);
218 BUG_ON(mrq
->data
->blksz
> host
->max_blk_size
);
219 BUG_ON(mrq
->data
->blocks
> host
->max_blk_count
);
220 BUG_ON(mrq
->data
->blocks
* mrq
->data
->blksz
>
223 #ifdef CONFIG_MMC_DEBUG
225 for_each_sg(mrq
->data
->sg
, sg
, mrq
->data
->sg_len
, i
)
227 BUG_ON(sz
!= mrq
->data
->blocks
* mrq
->data
->blksz
);
230 mrq
->cmd
->data
= mrq
->data
;
231 mrq
->data
->error
= 0;
232 mrq
->data
->mrq
= mrq
;
234 mrq
->data
->stop
= mrq
->stop
;
235 mrq
->stop
->error
= 0;
236 mrq
->stop
->mrq
= mrq
;
239 mmc_host_clk_hold(host
);
240 led_trigger_event(host
->led
, LED_FULL
);
241 host
->ops
->request(host
, mrq
);
245 * mmc_start_bkops - start BKOPS for supported cards
246 * @card: MMC card to start BKOPS
247 * @form_exception: A flag to indicate if this function was
248 * called due to an exception raised by the card
250 * Start background operations whenever requested.
251 * When the urgent BKOPS bit is set in a R1 command response
252 * then background operations should be started immediately.
254 void mmc_start_bkops(struct mmc_card
*card
, bool from_exception
)
258 bool use_busy_signal
;
262 if (!card
->ext_csd
.bkops_en
|| mmc_card_doing_bkops(card
))
265 err
= mmc_read_bkops_status(card
);
267 pr_err("%s: Failed to read bkops status: %d\n",
268 mmc_hostname(card
->host
), err
);
272 if (!card
->ext_csd
.raw_bkops_status
)
275 if (card
->ext_csd
.raw_bkops_status
< EXT_CSD_BKOPS_LEVEL_2
&&
279 mmc_claim_host(card
->host
);
280 if (card
->ext_csd
.raw_bkops_status
>= EXT_CSD_BKOPS_LEVEL_2
) {
281 timeout
= MMC_BKOPS_MAX_TIMEOUT
;
282 use_busy_signal
= true;
285 use_busy_signal
= false;
288 err
= __mmc_switch(card
, EXT_CSD_CMD_SET_NORMAL
,
289 EXT_CSD_BKOPS_START
, 1, timeout
,
290 use_busy_signal
, true, false);
292 pr_warn("%s: Error %d starting bkops\n",
293 mmc_hostname(card
->host
), err
);
298 * For urgent bkops status (LEVEL_2 and more)
299 * bkops executed synchronously, otherwise
300 * the operation is in progress
302 if (!use_busy_signal
)
303 mmc_card_set_doing_bkops(card
);
305 mmc_release_host(card
->host
);
307 EXPORT_SYMBOL(mmc_start_bkops
);
310 * mmc_wait_data_done() - done callback for data request
311 * @mrq: done data request
313 * Wakes up mmc context, passed as a callback to host controller driver
315 static void mmc_wait_data_done(struct mmc_request
*mrq
)
317 mrq
->host
->context_info
.is_done_rcv
= true;
318 wake_up_interruptible(&mrq
->host
->context_info
.wait
);
321 static void mmc_wait_done(struct mmc_request
*mrq
)
323 complete(&mrq
->completion
);
327 *__mmc_start_data_req() - starts data request
328 * @host: MMC host to start the request
329 * @mrq: data request to start
331 * Sets the done callback to be called when request is completed by the card.
332 * Starts data mmc request execution
334 static int __mmc_start_data_req(struct mmc_host
*host
, struct mmc_request
*mrq
)
336 mrq
->done
= mmc_wait_data_done
;
338 if (mmc_card_removed(host
->card
)) {
339 mrq
->cmd
->error
= -ENOMEDIUM
;
340 mmc_wait_data_done(mrq
);
343 mmc_start_request(host
, mrq
);
348 static int __mmc_start_req(struct mmc_host
*host
, struct mmc_request
*mrq
)
350 init_completion(&mrq
->completion
);
351 mrq
->done
= mmc_wait_done
;
352 if (mmc_card_removed(host
->card
)) {
353 mrq
->cmd
->error
= -ENOMEDIUM
;
354 complete(&mrq
->completion
);
357 mmc_start_request(host
, mrq
);
362 * mmc_wait_for_data_req_done() - wait for request completed
363 * @host: MMC host to prepare the command.
364 * @mrq: MMC request to wait for
366 * Blocks MMC context till host controller will ack end of data request
367 * execution or new request notification arrives from the block layer.
368 * Handles command retries.
370 * Returns enum mmc_blk_status after checking errors.
372 static int mmc_wait_for_data_req_done(struct mmc_host
*host
,
373 struct mmc_request
*mrq
,
374 struct mmc_async_req
*next_req
)
376 struct mmc_command
*cmd
;
377 struct mmc_context_info
*context_info
= &host
->context_info
;
382 wait_event_interruptible(context_info
->wait
,
383 (context_info
->is_done_rcv
||
384 context_info
->is_new_req
));
385 spin_lock_irqsave(&context_info
->lock
, flags
);
386 context_info
->is_waiting_last_req
= false;
387 spin_unlock_irqrestore(&context_info
->lock
, flags
);
388 if (context_info
->is_done_rcv
) {
389 context_info
->is_done_rcv
= false;
390 context_info
->is_new_req
= false;
393 if (!cmd
->error
|| !cmd
->retries
||
394 mmc_card_removed(host
->card
)) {
395 err
= host
->areq
->err_check(host
->card
,
397 break; /* return err */
399 pr_info("%s: req failed (CMD%u): %d, retrying...\n",
401 cmd
->opcode
, cmd
->error
);
404 host
->ops
->request(host
, mrq
);
405 continue; /* wait for done/new event again */
407 } else if (context_info
->is_new_req
) {
408 context_info
->is_new_req
= false;
410 err
= MMC_BLK_NEW_REQUEST
;
411 break; /* return err */
418 static void mmc_wait_for_req_done(struct mmc_host
*host
,
419 struct mmc_request
*mrq
)
421 struct mmc_command
*cmd
;
424 wait_for_completion(&mrq
->completion
);
429 * If host has timed out waiting for the sanitize
430 * to complete, card might be still in programming state
431 * so let's try to bring the card out of programming
434 if (cmd
->sanitize_busy
&& cmd
->error
== -ETIMEDOUT
) {
435 if (!mmc_interrupt_hpi(host
->card
)) {
436 pr_warning("%s: %s: Interrupted sanitize\n",
437 mmc_hostname(host
), __func__
);
441 pr_err("%s: %s: Failed to interrupt sanitize\n",
442 mmc_hostname(host
), __func__
);
445 if (!cmd
->error
|| !cmd
->retries
||
446 mmc_card_removed(host
->card
))
449 pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
450 mmc_hostname(host
), cmd
->opcode
, cmd
->error
);
453 host
->ops
->request(host
, mrq
);
458 * mmc_pre_req - Prepare for a new request
459 * @host: MMC host to prepare command
460 * @mrq: MMC request to prepare for
461 * @is_first_req: true if there is no previous started request
462 * that may run in parellel to this call, otherwise false
464 * mmc_pre_req() is called in prior to mmc_start_req() to let
465 * host prepare for the new request. Preparation of a request may be
466 * performed while another request is running on the host.
468 static void mmc_pre_req(struct mmc_host
*host
, struct mmc_request
*mrq
,
471 if (host
->ops
->pre_req
) {
472 mmc_host_clk_hold(host
);
473 host
->ops
->pre_req(host
, mrq
, is_first_req
);
474 mmc_host_clk_release(host
);
479 * mmc_post_req - Post process a completed request
480 * @host: MMC host to post process command
481 * @mrq: MMC request to post process for
482 * @err: Error, if non zero, clean up any resources made in pre_req
484 * Let the host post process a completed request. Post processing of
485 * a request may be performed while another reuqest is running.
487 static void mmc_post_req(struct mmc_host
*host
, struct mmc_request
*mrq
,
490 if (host
->ops
->post_req
) {
491 mmc_host_clk_hold(host
);
492 host
->ops
->post_req(host
, mrq
, err
);
493 mmc_host_clk_release(host
);
498 * mmc_start_req - start a non-blocking request
499 * @host: MMC host to start command
500 * @areq: async request to start
501 * @error: out parameter returns 0 for success, otherwise non zero
503 * Start a new MMC custom command request for a host.
504 * If there is on ongoing async request wait for completion
505 * of that request and start the new one and return.
506 * Does not wait for the new request to complete.
508 * Returns the completed request, NULL in case of none completed.
509 * Wait for the an ongoing request (previoulsy started) to complete and
510 * return the completed request. If there is no ongoing request, NULL
511 * is returned without waiting. NULL is not an error condition.
513 struct mmc_async_req
*mmc_start_req(struct mmc_host
*host
,
514 struct mmc_async_req
*areq
, int *error
)
518 struct mmc_async_req
*data
= host
->areq
;
520 /* Prepare a new request */
522 mmc_pre_req(host
, areq
->mrq
, !host
->areq
);
525 err
= mmc_wait_for_data_req_done(host
, host
->areq
->mrq
, areq
);
526 if (err
== MMC_BLK_NEW_REQUEST
) {
530 * The previous request was not completed,
536 * Check BKOPS urgency for each R1 response
538 if (host
->card
&& mmc_card_mmc(host
->card
) &&
539 ((mmc_resp_type(host
->areq
->mrq
->cmd
) == MMC_RSP_R1
) ||
540 (mmc_resp_type(host
->areq
->mrq
->cmd
) == MMC_RSP_R1B
)) &&
541 (host
->areq
->mrq
->cmd
->resp
[0] & R1_EXCEPTION_EVENT
))
542 mmc_start_bkops(host
->card
, true);
546 start_err
= __mmc_start_data_req(host
, areq
->mrq
);
549 mmc_post_req(host
, host
->areq
->mrq
, 0);
551 /* Cancel a prepared request if it was not started. */
552 if ((err
|| start_err
) && areq
)
553 mmc_post_req(host
, areq
->mrq
, -EINVAL
);
564 EXPORT_SYMBOL(mmc_start_req
);
567 * mmc_wait_for_req - start a request and wait for completion
568 * @host: MMC host to start command
569 * @mrq: MMC request to start
571 * Start a new MMC custom command request for a host, and wait
572 * for the command to complete. Does not attempt to parse the
575 void mmc_wait_for_req(struct mmc_host
*host
, struct mmc_request
*mrq
)
577 __mmc_start_req(host
, mrq
);
578 mmc_wait_for_req_done(host
, mrq
);
580 EXPORT_SYMBOL(mmc_wait_for_req
);
583 * mmc_interrupt_hpi - Issue for High priority Interrupt
584 * @card: the MMC card associated with the HPI transfer
586 * Issued High Priority Interrupt, and check for card status
587 * until out-of prg-state.
589 int mmc_interrupt_hpi(struct mmc_card
*card
)
593 unsigned long prg_wait
;
597 if (!card
->ext_csd
.hpi_en
) {
598 pr_info("%s: HPI enable bit unset\n", mmc_hostname(card
->host
));
602 mmc_claim_host(card
->host
);
603 err
= mmc_send_status(card
, &status
);
605 pr_err("%s: Get card status fail\n", mmc_hostname(card
->host
));
609 switch (R1_CURRENT_STATE(status
)) {
615 * In idle and transfer states, HPI is not needed and the caller
616 * can issue the next intended command immediately
622 /* In all other states, it's illegal to issue HPI */
623 pr_debug("%s: HPI cannot be sent. Card state=%d\n",
624 mmc_hostname(card
->host
), R1_CURRENT_STATE(status
));
629 err
= mmc_send_hpi_cmd(card
, &status
);
633 prg_wait
= jiffies
+ msecs_to_jiffies(card
->ext_csd
.out_of_int_time
);
635 err
= mmc_send_status(card
, &status
);
637 if (!err
&& R1_CURRENT_STATE(status
) == R1_STATE_TRAN
)
639 if (time_after(jiffies
, prg_wait
))
644 mmc_release_host(card
->host
);
647 EXPORT_SYMBOL(mmc_interrupt_hpi
);
650 * mmc_wait_for_cmd - start a command and wait for completion
651 * @host: MMC host to start command
652 * @cmd: MMC command to start
653 * @retries: maximum number of retries
655 * Start a new MMC command for a host, and wait for the command
656 * to complete. Return any error that occurred while the command
657 * was executing. Do not attempt to parse the response.
659 int mmc_wait_for_cmd(struct mmc_host
*host
, struct mmc_command
*cmd
, int retries
)
661 struct mmc_request mrq
= {NULL
};
663 WARN_ON(!host
->claimed
);
665 memset(cmd
->resp
, 0, sizeof(cmd
->resp
));
666 cmd
->retries
= retries
;
671 mmc_wait_for_req(host
, &mrq
);
676 EXPORT_SYMBOL(mmc_wait_for_cmd
);
679 * mmc_stop_bkops - stop ongoing BKOPS
680 * @card: MMC card to check BKOPS
682 * Send HPI command to stop ongoing background operations to
683 * allow rapid servicing of foreground operations, e.g. read/
684 * writes. Wait until the card comes out of the programming state
685 * to avoid errors in servicing read/write requests.
687 int mmc_stop_bkops(struct mmc_card
*card
)
692 err
= mmc_interrupt_hpi(card
);
695 * If err is EINVAL, we can't issue an HPI.
696 * It should complete the BKOPS.
698 if (!err
|| (err
== -EINVAL
)) {
699 mmc_card_clr_doing_bkops(card
);
705 EXPORT_SYMBOL(mmc_stop_bkops
);
707 int mmc_read_bkops_status(struct mmc_card
*card
)
713 * In future work, we should consider storing the entire ext_csd.
715 ext_csd
= kmalloc(512, GFP_KERNEL
);
717 pr_err("%s: could not allocate buffer to receive the ext_csd.\n",
718 mmc_hostname(card
->host
));
722 mmc_claim_host(card
->host
);
723 err
= mmc_send_ext_csd(card
, ext_csd
);
724 mmc_release_host(card
->host
);
728 card
->ext_csd
.raw_bkops_status
= ext_csd
[EXT_CSD_BKOPS_STATUS
];
729 card
->ext_csd
.raw_exception_status
= ext_csd
[EXT_CSD_EXP_EVENTS_STATUS
];
734 EXPORT_SYMBOL(mmc_read_bkops_status
);
737 * mmc_set_data_timeout - set the timeout for a data command
738 * @data: data phase for command
739 * @card: the MMC card associated with the data transfer
741 * Computes the data timeout parameters according to the
742 * correct algorithm given the card type.
744 void mmc_set_data_timeout(struct mmc_data
*data
, const struct mmc_card
*card
)
749 * SDIO cards only define an upper 1 s limit on access.
751 if (mmc_card_sdio(card
)) {
752 data
->timeout_ns
= 1000000000;
753 data
->timeout_clks
= 0;
758 * SD cards use a 100 multiplier rather than 10
760 mult
= mmc_card_sd(card
) ? 100 : 10;
763 * Scale up the multiplier (and therefore the timeout) by
764 * the r2w factor for writes.
766 if (data
->flags
& MMC_DATA_WRITE
)
767 mult
<<= card
->csd
.r2w_factor
;
769 data
->timeout_ns
= card
->csd
.tacc_ns
* mult
;
770 data
->timeout_clks
= card
->csd
.tacc_clks
* mult
;
773 * SD cards also have an upper limit on the timeout.
775 if (mmc_card_sd(card
)) {
776 unsigned int timeout_us
, limit_us
;
778 timeout_us
= data
->timeout_ns
/ 1000;
779 if (mmc_host_clk_rate(card
->host
))
780 timeout_us
+= data
->timeout_clks
* 1000 /
781 (mmc_host_clk_rate(card
->host
) / 1000);
783 if (data
->flags
& MMC_DATA_WRITE
)
785 * The MMC spec "It is strongly recommended
786 * for hosts to implement more than 500ms
787 * timeout value even if the card indicates
788 * the 250ms maximum busy length." Even the
789 * previous value of 300ms is known to be
790 * insufficient for some cards.
797 * SDHC cards always use these fixed values.
799 if (timeout_us
> limit_us
|| mmc_card_blockaddr(card
)) {
800 data
->timeout_ns
= limit_us
* 1000;
801 data
->timeout_clks
= 0;
806 * Some cards require longer data read timeout than indicated in CSD.
807 * Address this by setting the read timeout to a "reasonably high"
808 * value. For the cards tested, 300ms has proven enough. If necessary,
809 * this value can be increased if other problematic cards require this.
811 if (mmc_card_long_read_time(card
) && data
->flags
& MMC_DATA_READ
) {
812 data
->timeout_ns
= 300000000;
813 data
->timeout_clks
= 0;
817 * Some cards need very high timeouts if driven in SPI mode.
818 * The worst observed timeout was 900ms after writing a
819 * continuous stream of data until the internal logic
822 if (mmc_host_is_spi(card
->host
)) {
823 if (data
->flags
& MMC_DATA_WRITE
) {
824 if (data
->timeout_ns
< 1000000000)
825 data
->timeout_ns
= 1000000000; /* 1s */
827 if (data
->timeout_ns
< 100000000)
828 data
->timeout_ns
= 100000000; /* 100ms */
832 EXPORT_SYMBOL(mmc_set_data_timeout
);
835 * mmc_align_data_size - pads a transfer size to a more optimal value
836 * @card: the MMC card associated with the data transfer
837 * @sz: original transfer size
839 * Pads the original data size with a number of extra bytes in
840 * order to avoid controller bugs and/or performance hits
841 * (e.g. some controllers revert to PIO for certain sizes).
843 * Returns the improved size, which might be unmodified.
845 * Note that this function is only relevant when issuing a
846 * single scatter gather entry.
848 unsigned int mmc_align_data_size(struct mmc_card
*card
, unsigned int sz
)
851 * FIXME: We don't have a system for the controller to tell
852 * the core about its problems yet, so for now we just 32-bit
855 sz
= ((sz
+ 3) / 4) * 4;
859 EXPORT_SYMBOL(mmc_align_data_size
);
862 * __mmc_claim_host - exclusively claim a host
863 * @host: mmc host to claim
864 * @abort: whether or not the operation should be aborted
866 * Claim a host for a set of operations. If @abort is non null and
867 * dereference a non-zero value then this will return prematurely with
868 * that non-zero value without acquiring the lock. Returns zero
869 * with the lock held otherwise.
871 int __mmc_claim_host(struct mmc_host
*host
, atomic_t
*abort
)
873 DECLARE_WAITQUEUE(wait
, current
);
879 add_wait_queue(&host
->wq
, &wait
);
880 spin_lock_irqsave(&host
->lock
, flags
);
882 set_current_state(TASK_UNINTERRUPTIBLE
);
883 stop
= abort
? atomic_read(abort
) : 0;
884 if (stop
|| !host
->claimed
|| host
->claimer
== current
)
886 spin_unlock_irqrestore(&host
->lock
, flags
);
888 spin_lock_irqsave(&host
->lock
, flags
);
890 set_current_state(TASK_RUNNING
);
893 host
->claimer
= current
;
894 host
->claim_cnt
+= 1;
897 spin_unlock_irqrestore(&host
->lock
, flags
);
898 remove_wait_queue(&host
->wq
, &wait
);
899 if (host
->ops
->enable
&& !stop
&& host
->claim_cnt
== 1)
900 host
->ops
->enable(host
);
904 EXPORT_SYMBOL(__mmc_claim_host
);
907 * mmc_release_host - release a host
908 * @host: mmc host to release
910 * Release a MMC host, allowing others to claim the host
911 * for their operations.
913 void mmc_release_host(struct mmc_host
*host
)
917 WARN_ON(!host
->claimed
);
919 if (host
->ops
->disable
&& host
->claim_cnt
== 1)
920 host
->ops
->disable(host
);
922 spin_lock_irqsave(&host
->lock
, flags
);
923 if (--host
->claim_cnt
) {
924 /* Release for nested claim */
925 spin_unlock_irqrestore(&host
->lock
, flags
);
928 host
->claimer
= NULL
;
929 spin_unlock_irqrestore(&host
->lock
, flags
);
933 EXPORT_SYMBOL(mmc_release_host
);
936 * This is a helper function, which fetches a runtime pm reference for the
937 * card device and also claims the host.
939 void mmc_get_card(struct mmc_card
*card
)
941 pm_runtime_get_sync(&card
->dev
);
942 mmc_claim_host(card
->host
);
944 EXPORT_SYMBOL(mmc_get_card
);
947 * This is a helper function, which releases the host and drops the runtime
948 * pm reference for the card device.
950 void mmc_put_card(struct mmc_card
*card
)
952 mmc_release_host(card
->host
);
953 pm_runtime_mark_last_busy(&card
->dev
);
954 pm_runtime_put_autosuspend(&card
->dev
);
956 EXPORT_SYMBOL(mmc_put_card
);
959 * Internal function that does the actual ios call to the host driver,
960 * optionally printing some debug output.
962 static inline void mmc_set_ios(struct mmc_host
*host
)
964 struct mmc_ios
*ios
= &host
->ios
;
966 pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u "
967 "width %u timing %u\n",
968 mmc_hostname(host
), ios
->clock
, ios
->bus_mode
,
969 ios
->power_mode
, ios
->chip_select
, ios
->vdd
,
970 ios
->bus_width
, ios
->timing
);
973 mmc_set_ungated(host
);
974 host
->ops
->set_ios(host
, ios
);
978 * Control chip select pin on a host.
980 void mmc_set_chip_select(struct mmc_host
*host
, int mode
)
982 mmc_host_clk_hold(host
);
983 host
->ios
.chip_select
= mode
;
985 mmc_host_clk_release(host
);
989 * Sets the host clock to the highest possible frequency that
992 static void __mmc_set_clock(struct mmc_host
*host
, unsigned int hz
)
994 WARN_ON(hz
< host
->f_min
);
996 if (hz
> host
->f_max
)
999 host
->ios
.clock
= hz
;
1003 void mmc_set_clock(struct mmc_host
*host
, unsigned int hz
)
1005 mmc_host_clk_hold(host
);
1006 __mmc_set_clock(host
, hz
);
1007 mmc_host_clk_release(host
);
1010 #ifdef CONFIG_MMC_CLKGATE
1012 * This gates the clock by setting it to 0 Hz.
1014 void mmc_gate_clock(struct mmc_host
*host
)
1016 unsigned long flags
;
1018 spin_lock_irqsave(&host
->clk_lock
, flags
);
1019 host
->clk_old
= host
->ios
.clock
;
1020 host
->ios
.clock
= 0;
1021 host
->clk_gated
= true;
1022 spin_unlock_irqrestore(&host
->clk_lock
, flags
);
1027 * This restores the clock from gating by using the cached
1030 void mmc_ungate_clock(struct mmc_host
*host
)
1033 * We should previously have gated the clock, so the clock shall
1034 * be 0 here! The clock may however be 0 during initialization,
1035 * when some request operations are performed before setting
1036 * the frequency. When ungate is requested in that situation
1037 * we just ignore the call.
1039 if (host
->clk_old
) {
1040 BUG_ON(host
->ios
.clock
);
1041 /* This call will also set host->clk_gated to false */
1042 __mmc_set_clock(host
, host
->clk_old
);
1046 void mmc_set_ungated(struct mmc_host
*host
)
1048 unsigned long flags
;
1051 * We've been given a new frequency while the clock is gated,
1052 * so make sure we regard this as ungating it.
1054 spin_lock_irqsave(&host
->clk_lock
, flags
);
1055 host
->clk_gated
= false;
1056 spin_unlock_irqrestore(&host
->clk_lock
, flags
);
1060 void mmc_set_ungated(struct mmc_host
*host
)
1066 * Change the bus mode (open drain/push-pull) of a host.
1068 void mmc_set_bus_mode(struct mmc_host
*host
, unsigned int mode
)
1070 mmc_host_clk_hold(host
);
1071 host
->ios
.bus_mode
= mode
;
1073 mmc_host_clk_release(host
);
1077 * Change data bus width of a host.
1079 void mmc_set_bus_width(struct mmc_host
*host
, unsigned int width
)
1081 mmc_host_clk_hold(host
);
1082 host
->ios
.bus_width
= width
;
1084 mmc_host_clk_release(host
);
1088 * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number
1089 * @vdd: voltage (mV)
1090 * @low_bits: prefer low bits in boundary cases
1092 * This function returns the OCR bit number according to the provided @vdd
1093 * value. If conversion is not possible a negative errno value returned.
1095 * Depending on the @low_bits flag the function prefers low or high OCR bits
1096 * on boundary voltages. For example,
1097 * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33);
1098 * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34);
1100 * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21).
1102 static int mmc_vdd_to_ocrbitnum(int vdd
, bool low_bits
)
1104 const int max_bit
= ilog2(MMC_VDD_35_36
);
1107 if (vdd
< 1650 || vdd
> 3600)
1110 if (vdd
>= 1650 && vdd
<= 1950)
1111 return ilog2(MMC_VDD_165_195
);
1116 /* Base 2000 mV, step 100 mV, bit's base 8. */
1117 bit
= (vdd
- 2000) / 100 + 8;
1124 * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask
1125 * @vdd_min: minimum voltage value (mV)
1126 * @vdd_max: maximum voltage value (mV)
1128 * This function returns the OCR mask bits according to the provided @vdd_min
1129 * and @vdd_max values. If conversion is not possible the function returns 0.
1131 * Notes wrt boundary cases:
1132 * This function sets the OCR bits for all boundary voltages, for example
1133 * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 |
1134 * MMC_VDD_34_35 mask.
1136 u32
mmc_vddrange_to_ocrmask(int vdd_min
, int vdd_max
)
1140 if (vdd_max
< vdd_min
)
1143 /* Prefer high bits for the boundary vdd_max values. */
1144 vdd_max
= mmc_vdd_to_ocrbitnum(vdd_max
, false);
1148 /* Prefer low bits for the boundary vdd_min values. */
1149 vdd_min
= mmc_vdd_to_ocrbitnum(vdd_min
, true);
1153 /* Fill the mask, from max bit to min bit. */
1154 while (vdd_max
>= vdd_min
)
1155 mask
|= 1 << vdd_max
--;
1159 EXPORT_SYMBOL(mmc_vddrange_to_ocrmask
);
1164 * mmc_of_parse_voltage - return mask of supported voltages
1165 * @np: The device node need to be parsed.
1166 * @mask: mask of voltages available for MMC/SD/SDIO
1168 * 1. Return zero on success.
1169 * 2. Return negative errno: voltage-range is invalid.
1171 int mmc_of_parse_voltage(struct device_node
*np
, u32
*mask
)
1173 const u32
*voltage_ranges
;
1176 voltage_ranges
= of_get_property(np
, "voltage-ranges", &num_ranges
);
1177 num_ranges
= num_ranges
/ sizeof(*voltage_ranges
) / 2;
1178 if (!voltage_ranges
|| !num_ranges
) {
1179 pr_info("%s: voltage-ranges unspecified\n", np
->full_name
);
1183 for (i
= 0; i
< num_ranges
; i
++) {
1184 const int j
= i
* 2;
1187 ocr_mask
= mmc_vddrange_to_ocrmask(
1188 be32_to_cpu(voltage_ranges
[j
]),
1189 be32_to_cpu(voltage_ranges
[j
+ 1]));
1191 pr_err("%s: voltage-range #%d is invalid\n",
1200 EXPORT_SYMBOL(mmc_of_parse_voltage
);
1202 #endif /* CONFIG_OF */
1204 #ifdef CONFIG_REGULATOR
1207 * mmc_regulator_get_ocrmask - return mask of supported voltages
1208 * @supply: regulator to use
1210 * This returns either a negative errno, or a mask of voltages that
1211 * can be provided to MMC/SD/SDIO devices using the specified voltage
1212 * regulator. This would normally be called before registering the
1215 int mmc_regulator_get_ocrmask(struct regulator
*supply
)
1221 count
= regulator_count_voltages(supply
);
1225 for (i
= 0; i
< count
; i
++) {
1229 vdd_uV
= regulator_list_voltage(supply
, i
);
1233 vdd_mV
= vdd_uV
/ 1000;
1234 result
|= mmc_vddrange_to_ocrmask(vdd_mV
, vdd_mV
);
1239 EXPORT_SYMBOL_GPL(mmc_regulator_get_ocrmask
);
1242 * mmc_regulator_set_ocr - set regulator to match host->ios voltage
1243 * @mmc: the host to regulate
1244 * @supply: regulator to use
1245 * @vdd_bit: zero for power off, else a bit number (host->ios.vdd)
1247 * Returns zero on success, else negative errno.
1249 * MMC host drivers may use this to enable or disable a regulator using
1250 * a particular supply voltage. This would normally be called from the
1253 int mmc_regulator_set_ocr(struct mmc_host
*mmc
,
1254 struct regulator
*supply
,
1255 unsigned short vdd_bit
)
1265 * REVISIT mmc_vddrange_to_ocrmask() may have set some
1266 * bits this regulator doesn't quite support ... don't
1267 * be too picky, most cards and regulators are OK with
1268 * a 0.1V range goof (it's a small error percentage).
1270 tmp
= vdd_bit
- ilog2(MMC_VDD_165_195
);
1272 min_uV
= 1650 * 1000;
1273 max_uV
= 1950 * 1000;
1275 min_uV
= 1900 * 1000 + tmp
* 100 * 1000;
1276 max_uV
= min_uV
+ 100 * 1000;
1280 * If we're using a fixed/static regulator, don't call
1281 * regulator_set_voltage; it would fail.
1283 voltage
= regulator_get_voltage(supply
);
1285 if (!regulator_can_change_voltage(supply
))
1286 min_uV
= max_uV
= voltage
;
1290 else if (voltage
< min_uV
|| voltage
> max_uV
)
1291 result
= regulator_set_voltage(supply
, min_uV
, max_uV
);
1295 if (result
== 0 && !mmc
->regulator_enabled
) {
1296 result
= regulator_enable(supply
);
1298 mmc
->regulator_enabled
= true;
1300 } else if (mmc
->regulator_enabled
) {
1301 result
= regulator_disable(supply
);
1303 mmc
->regulator_enabled
= false;
1307 dev_err(mmc_dev(mmc
),
1308 "could not set regulator OCR (%d)\n", result
);
1311 EXPORT_SYMBOL_GPL(mmc_regulator_set_ocr
);
1313 int mmc_regulator_get_supply(struct mmc_host
*mmc
)
1315 struct device
*dev
= mmc_dev(mmc
);
1316 struct regulator
*supply
;
1319 supply
= devm_regulator_get(dev
, "vmmc");
1320 mmc
->supply
.vmmc
= supply
;
1321 mmc
->supply
.vqmmc
= devm_regulator_get_optional(dev
, "vqmmc");
1324 return PTR_ERR(supply
);
1326 ret
= mmc_regulator_get_ocrmask(supply
);
1328 mmc
->ocr_avail
= ret
;
1330 dev_warn(mmc_dev(mmc
), "Failed getting OCR mask: %d\n", ret
);
1334 EXPORT_SYMBOL_GPL(mmc_regulator_get_supply
);
1336 #endif /* CONFIG_REGULATOR */
1339 * Mask off any voltages we don't support and select
1340 * the lowest voltage
1342 u32
mmc_select_voltage(struct mmc_host
*host
, u32 ocr
)
1347 * Sanity check the voltages that the card claims to
1351 dev_warn(mmc_dev(host
),
1352 "card claims to support voltages below defined range\n");
1356 ocr
&= host
->ocr_avail
;
1358 dev_warn(mmc_dev(host
), "no support for card's volts\n");
1362 if (host
->caps2
& MMC_CAP2_FULL_PWR_CYCLE
) {
1365 mmc_power_cycle(host
, ocr
);
1369 if (bit
!= host
->ios
.vdd
)
1370 dev_warn(mmc_dev(host
), "exceeding card's volts\n");
1376 int __mmc_set_signal_voltage(struct mmc_host
*host
, int signal_voltage
)
1379 int old_signal_voltage
= host
->ios
.signal_voltage
;
1381 host
->ios
.signal_voltage
= signal_voltage
;
1382 if (host
->ops
->start_signal_voltage_switch
) {
1383 mmc_host_clk_hold(host
);
1384 err
= host
->ops
->start_signal_voltage_switch(host
, &host
->ios
);
1385 mmc_host_clk_release(host
);
1389 host
->ios
.signal_voltage
= old_signal_voltage
;
1395 int mmc_set_signal_voltage(struct mmc_host
*host
, int signal_voltage
, u32 ocr
)
1397 struct mmc_command cmd
= {0};
1404 * Send CMD11 only if the request is to switch the card to
1407 if (signal_voltage
== MMC_SIGNAL_VOLTAGE_330
)
1408 return __mmc_set_signal_voltage(host
, signal_voltage
);
1411 * If we cannot switch voltages, return failure so the caller
1412 * can continue without UHS mode
1414 if (!host
->ops
->start_signal_voltage_switch
)
1416 if (!host
->ops
->card_busy
)
1417 pr_warning("%s: cannot verify signal voltage switch\n",
1418 mmc_hostname(host
));
1420 cmd
.opcode
= SD_SWITCH_VOLTAGE
;
1422 cmd
.flags
= MMC_RSP_R1
| MMC_CMD_AC
;
1424 err
= mmc_wait_for_cmd(host
, &cmd
, 0);
1428 if (!mmc_host_is_spi(host
) && (cmd
.resp
[0] & R1_ERROR
))
1431 mmc_host_clk_hold(host
);
1433 * The card should drive cmd and dat[0:3] low immediately
1434 * after the response of cmd11, but wait 1 ms to be sure
1437 if (host
->ops
->card_busy
&& !host
->ops
->card_busy(host
)) {
1442 * During a signal voltage level switch, the clock must be gated
1443 * for 5 ms according to the SD spec
1445 clock
= host
->ios
.clock
;
1446 host
->ios
.clock
= 0;
1449 if (__mmc_set_signal_voltage(host
, signal_voltage
)) {
1451 * Voltages may not have been switched, but we've already
1452 * sent CMD11, so a power cycle is required anyway
1458 /* Keep clock gated for at least 5 ms */
1460 host
->ios
.clock
= clock
;
1463 /* Wait for at least 1 ms according to spec */
1467 * Failure to switch is indicated by the card holding
1470 if (host
->ops
->card_busy
&& host
->ops
->card_busy(host
))
1475 pr_debug("%s: Signal voltage switch failed, "
1476 "power cycling card\n", mmc_hostname(host
));
1477 mmc_power_cycle(host
, ocr
);
1480 mmc_host_clk_release(host
);
1486 * Select timing parameters for host.
1488 void mmc_set_timing(struct mmc_host
*host
, unsigned int timing
)
1490 mmc_host_clk_hold(host
);
1491 host
->ios
.timing
= timing
;
1493 mmc_host_clk_release(host
);
1497 * Select appropriate driver type for host.
1499 void mmc_set_driver_type(struct mmc_host
*host
, unsigned int drv_type
)
1501 mmc_host_clk_hold(host
);
1502 host
->ios
.drv_type
= drv_type
;
1504 mmc_host_clk_release(host
);
1508 * Apply power to the MMC stack. This is a two-stage process.
1509 * First, we enable power to the card without the clock running.
1510 * We then wait a bit for the power to stabilise. Finally,
1511 * enable the bus drivers and clock to the card.
1513 * We must _NOT_ enable the clock prior to power stablising.
1515 * If a host does all the power sequencing itself, ignore the
1516 * initial MMC_POWER_UP stage.
1518 void mmc_power_up(struct mmc_host
*host
, u32 ocr
)
1520 if (host
->ios
.power_mode
== MMC_POWER_ON
)
1523 mmc_host_clk_hold(host
);
1525 host
->ios
.vdd
= fls(ocr
) - 1;
1526 if (mmc_host_is_spi(host
))
1527 host
->ios
.chip_select
= MMC_CS_HIGH
;
1529 host
->ios
.chip_select
= MMC_CS_DONTCARE
;
1530 host
->ios
.bus_mode
= MMC_BUSMODE_PUSHPULL
;
1531 host
->ios
.power_mode
= MMC_POWER_UP
;
1532 host
->ios
.bus_width
= MMC_BUS_WIDTH_1
;
1533 host
->ios
.timing
= MMC_TIMING_LEGACY
;
1536 /* Set signal voltage to 3.3V */
1537 __mmc_set_signal_voltage(host
, MMC_SIGNAL_VOLTAGE_330
);
1540 * This delay should be sufficient to allow the power supply
1541 * to reach the minimum voltage.
1545 host
->ios
.clock
= host
->f_init
;
1547 host
->ios
.power_mode
= MMC_POWER_ON
;
1551 * This delay must be at least 74 clock sizes, or 1 ms, or the
1552 * time required to reach a stable voltage.
1556 mmc_host_clk_release(host
);
1559 void mmc_power_off(struct mmc_host
*host
)
1561 if (host
->ios
.power_mode
== MMC_POWER_OFF
)
1564 mmc_host_clk_hold(host
);
1566 host
->ios
.clock
= 0;
1569 if (!mmc_host_is_spi(host
)) {
1570 host
->ios
.bus_mode
= MMC_BUSMODE_OPENDRAIN
;
1571 host
->ios
.chip_select
= MMC_CS_DONTCARE
;
1573 host
->ios
.power_mode
= MMC_POWER_OFF
;
1574 host
->ios
.bus_width
= MMC_BUS_WIDTH_1
;
1575 host
->ios
.timing
= MMC_TIMING_LEGACY
;
1579 * Some configurations, such as the 802.11 SDIO card in the OLPC
1580 * XO-1.5, require a short delay after poweroff before the card
1581 * can be successfully turned on again.
1585 mmc_host_clk_release(host
);
1588 void mmc_power_cycle(struct mmc_host
*host
, u32 ocr
)
1590 mmc_power_off(host
);
1591 /* Wait at least 1 ms according to SD spec */
1593 mmc_power_up(host
, ocr
);
1597 * Cleanup when the last reference to the bus operator is dropped.
1599 static void __mmc_release_bus(struct mmc_host
*host
)
1602 BUG_ON(host
->bus_refs
);
1603 BUG_ON(!host
->bus_dead
);
1605 host
->bus_ops
= NULL
;
1609 * Increase reference count of bus operator
1611 static inline void mmc_bus_get(struct mmc_host
*host
)
1613 unsigned long flags
;
1615 spin_lock_irqsave(&host
->lock
, flags
);
1617 spin_unlock_irqrestore(&host
->lock
, flags
);
1621 * Decrease reference count of bus operator and free it if
1622 * it is the last reference.
1624 static inline void mmc_bus_put(struct mmc_host
*host
)
1626 unsigned long flags
;
1628 spin_lock_irqsave(&host
->lock
, flags
);
1630 if ((host
->bus_refs
== 0) && host
->bus_ops
)
1631 __mmc_release_bus(host
);
1632 spin_unlock_irqrestore(&host
->lock
, flags
);
1636 * Assign a mmc bus handler to a host. Only one bus handler may control a
1637 * host at any given time.
1639 void mmc_attach_bus(struct mmc_host
*host
, const struct mmc_bus_ops
*ops
)
1641 unsigned long flags
;
1646 WARN_ON(!host
->claimed
);
1648 spin_lock_irqsave(&host
->lock
, flags
);
1650 BUG_ON(host
->bus_ops
);
1651 BUG_ON(host
->bus_refs
);
1653 host
->bus_ops
= ops
;
1657 spin_unlock_irqrestore(&host
->lock
, flags
);
1661 * Remove the current bus handler from a host.
1663 void mmc_detach_bus(struct mmc_host
*host
)
1665 unsigned long flags
;
1669 WARN_ON(!host
->claimed
);
1670 WARN_ON(!host
->bus_ops
);
1672 spin_lock_irqsave(&host
->lock
, flags
);
1676 spin_unlock_irqrestore(&host
->lock
, flags
);
1681 static void _mmc_detect_change(struct mmc_host
*host
, unsigned long delay
,
1684 #ifdef CONFIG_MMC_DEBUG
1685 unsigned long flags
;
1686 spin_lock_irqsave(&host
->lock
, flags
);
1687 WARN_ON(host
->removed
);
1688 spin_unlock_irqrestore(&host
->lock
, flags
);
1692 * If the device is configured as wakeup, we prevent a new sleep for
1693 * 5 s to give provision for user space to consume the event.
1695 if (cd_irq
&& !(host
->caps
& MMC_CAP_NEEDS_POLL
) &&
1696 device_can_wakeup(mmc_dev(host
)))
1697 pm_wakeup_event(mmc_dev(host
), 5000);
1699 host
->detect_change
= 1;
1700 mmc_schedule_delayed_work(&host
->detect
, delay
);
1704 * mmc_detect_change - process change of state on a MMC socket
1705 * @host: host which changed state.
1706 * @delay: optional delay to wait before detection (jiffies)
1708 * MMC drivers should call this when they detect a card has been
1709 * inserted or removed. The MMC layer will confirm that any
1710 * present card is still functional, and initialize any newly
1713 void mmc_detect_change(struct mmc_host
*host
, unsigned long delay
)
1715 _mmc_detect_change(host
, delay
, true);
1717 EXPORT_SYMBOL(mmc_detect_change
);
1719 void mmc_init_erase(struct mmc_card
*card
)
1723 if (is_power_of_2(card
->erase_size
))
1724 card
->erase_shift
= ffs(card
->erase_size
) - 1;
1726 card
->erase_shift
= 0;
1729 * It is possible to erase an arbitrarily large area of an SD or MMC
1730 * card. That is not desirable because it can take a long time
1731 * (minutes) potentially delaying more important I/O, and also the
1732 * timeout calculations become increasingly hugely over-estimated.
1733 * Consequently, 'pref_erase' is defined as a guide to limit erases
1734 * to that size and alignment.
1736 * For SD cards that define Allocation Unit size, limit erases to one
1737 * Allocation Unit at a time. For MMC cards that define High Capacity
1738 * Erase Size, whether it is switched on or not, limit to that size.
1739 * Otherwise just have a stab at a good value. For modern cards it
1740 * will end up being 4MiB. Note that if the value is too small, it
1741 * can end up taking longer to erase.
1743 if (mmc_card_sd(card
) && card
->ssr
.au
) {
1744 card
->pref_erase
= card
->ssr
.au
;
1745 card
->erase_shift
= ffs(card
->ssr
.au
) - 1;
1746 } else if (card
->ext_csd
.hc_erase_size
) {
1747 card
->pref_erase
= card
->ext_csd
.hc_erase_size
;
1749 sz
= (card
->csd
.capacity
<< (card
->csd
.read_blkbits
- 9)) >> 11;
1751 card
->pref_erase
= 512 * 1024 / 512;
1753 card
->pref_erase
= 1024 * 1024 / 512;
1755 card
->pref_erase
= 2 * 1024 * 1024 / 512;
1757 card
->pref_erase
= 4 * 1024 * 1024 / 512;
1758 if (card
->pref_erase
< card
->erase_size
)
1759 card
->pref_erase
= card
->erase_size
;
1761 sz
= card
->pref_erase
% card
->erase_size
;
1763 card
->pref_erase
+= card
->erase_size
- sz
;
1768 static unsigned int mmc_mmc_erase_timeout(struct mmc_card
*card
,
1769 unsigned int arg
, unsigned int qty
)
1771 unsigned int erase_timeout
;
1773 if (arg
== MMC_DISCARD_ARG
||
1774 (arg
== MMC_TRIM_ARG
&& card
->ext_csd
.rev
>= 6)) {
1775 erase_timeout
= card
->ext_csd
.trim_timeout
;
1776 } else if (card
->ext_csd
.erase_group_def
& 1) {
1777 /* High Capacity Erase Group Size uses HC timeouts */
1778 if (arg
== MMC_TRIM_ARG
)
1779 erase_timeout
= card
->ext_csd
.trim_timeout
;
1781 erase_timeout
= card
->ext_csd
.hc_erase_timeout
;
1783 /* CSD Erase Group Size uses write timeout */
1784 unsigned int mult
= (10 << card
->csd
.r2w_factor
);
1785 unsigned int timeout_clks
= card
->csd
.tacc_clks
* mult
;
1786 unsigned int timeout_us
;
1788 /* Avoid overflow: e.g. tacc_ns=80000000 mult=1280 */
1789 if (card
->csd
.tacc_ns
< 1000000)
1790 timeout_us
= (card
->csd
.tacc_ns
* mult
) / 1000;
1792 timeout_us
= (card
->csd
.tacc_ns
/ 1000) * mult
;
1795 * ios.clock is only a target. The real clock rate might be
1796 * less but not that much less, so fudge it by multiplying by 2.
1799 timeout_us
+= (timeout_clks
* 1000) /
1800 (mmc_host_clk_rate(card
->host
) / 1000);
1802 erase_timeout
= timeout_us
/ 1000;
1805 * Theoretically, the calculation could underflow so round up
1806 * to 1ms in that case.
1812 /* Multiplier for secure operations */
1813 if (arg
& MMC_SECURE_ARGS
) {
1814 if (arg
== MMC_SECURE_ERASE_ARG
)
1815 erase_timeout
*= card
->ext_csd
.sec_erase_mult
;
1817 erase_timeout
*= card
->ext_csd
.sec_trim_mult
;
1820 erase_timeout
*= qty
;
1823 * Ensure at least a 1 second timeout for SPI as per
1824 * 'mmc_set_data_timeout()'
1826 if (mmc_host_is_spi(card
->host
) && erase_timeout
< 1000)
1827 erase_timeout
= 1000;
1829 return erase_timeout
;
1832 static unsigned int mmc_sd_erase_timeout(struct mmc_card
*card
,
1836 unsigned int erase_timeout
;
1838 if (card
->ssr
.erase_timeout
) {
1839 /* Erase timeout specified in SD Status Register (SSR) */
1840 erase_timeout
= card
->ssr
.erase_timeout
* qty
+
1841 card
->ssr
.erase_offset
;
1844 * Erase timeout not specified in SD Status Register (SSR) so
1845 * use 250ms per write block.
1847 erase_timeout
= 250 * qty
;
1850 /* Must not be less than 1 second */
1851 if (erase_timeout
< 1000)
1852 erase_timeout
= 1000;
1854 return erase_timeout
;
1857 static unsigned int mmc_erase_timeout(struct mmc_card
*card
,
1861 if (mmc_card_sd(card
))
1862 return mmc_sd_erase_timeout(card
, arg
, qty
);
1864 return mmc_mmc_erase_timeout(card
, arg
, qty
);
1867 static int mmc_do_erase(struct mmc_card
*card
, unsigned int from
,
1868 unsigned int to
, unsigned int arg
)
1870 struct mmc_command cmd
= {0};
1871 unsigned int qty
= 0;
1872 unsigned long timeout
;
1876 * qty is used to calculate the erase timeout which depends on how many
1877 * erase groups (or allocation units in SD terminology) are affected.
1878 * We count erasing part of an erase group as one erase group.
1879 * For SD, the allocation units are always a power of 2. For MMC, the
1880 * erase group size is almost certainly also power of 2, but it does not
1881 * seem to insist on that in the JEDEC standard, so we fall back to
1882 * division in that case. SD may not specify an allocation unit size,
1883 * in which case the timeout is based on the number of write blocks.
1885 * Note that the timeout for secure trim 2 will only be correct if the
1886 * number of erase groups specified is the same as the total of all
1887 * preceding secure trim 1 commands. Since the power may have been
1888 * lost since the secure trim 1 commands occurred, it is generally
1889 * impossible to calculate the secure trim 2 timeout correctly.
1891 if (card
->erase_shift
)
1892 qty
+= ((to
>> card
->erase_shift
) -
1893 (from
>> card
->erase_shift
)) + 1;
1894 else if (mmc_card_sd(card
))
1895 qty
+= to
- from
+ 1;
1897 qty
+= ((to
/ card
->erase_size
) -
1898 (from
/ card
->erase_size
)) + 1;
1900 if (!mmc_card_blockaddr(card
)) {
1905 if (mmc_card_sd(card
))
1906 cmd
.opcode
= SD_ERASE_WR_BLK_START
;
1908 cmd
.opcode
= MMC_ERASE_GROUP_START
;
1910 cmd
.flags
= MMC_RSP_SPI_R1
| MMC_RSP_R1
| MMC_CMD_AC
;
1911 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 0);
1913 pr_err("mmc_erase: group start error %d, "
1914 "status %#x\n", err
, cmd
.resp
[0]);
1919 memset(&cmd
, 0, sizeof(struct mmc_command
));
1920 if (mmc_card_sd(card
))
1921 cmd
.opcode
= SD_ERASE_WR_BLK_END
;
1923 cmd
.opcode
= MMC_ERASE_GROUP_END
;
1925 cmd
.flags
= MMC_RSP_SPI_R1
| MMC_RSP_R1
| MMC_CMD_AC
;
1926 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 0);
1928 pr_err("mmc_erase: group end error %d, status %#x\n",
1934 memset(&cmd
, 0, sizeof(struct mmc_command
));
1935 cmd
.opcode
= MMC_ERASE
;
1937 cmd
.flags
= MMC_RSP_SPI_R1B
| MMC_RSP_R1B
| MMC_CMD_AC
;
1938 cmd
.busy_timeout
= mmc_erase_timeout(card
, arg
, qty
);
1939 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 0);
1941 pr_err("mmc_erase: erase error %d, status %#x\n",
1947 if (mmc_host_is_spi(card
->host
))
1950 timeout
= jiffies
+ msecs_to_jiffies(MMC_CORE_TIMEOUT_MS
);
1952 memset(&cmd
, 0, sizeof(struct mmc_command
));
1953 cmd
.opcode
= MMC_SEND_STATUS
;
1954 cmd
.arg
= card
->rca
<< 16;
1955 cmd
.flags
= MMC_RSP_R1
| MMC_CMD_AC
;
1956 /* Do not retry else we can't see errors */
1957 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 0);
1958 if (err
|| (cmd
.resp
[0] & 0xFDF92000)) {
1959 pr_err("error %d requesting status %#x\n",
1965 /* Timeout if the device never becomes ready for data and
1966 * never leaves the program state.
1968 if (time_after(jiffies
, timeout
)) {
1969 pr_err("%s: Card stuck in programming state! %s\n",
1970 mmc_hostname(card
->host
), __func__
);
1975 } while (!(cmd
.resp
[0] & R1_READY_FOR_DATA
) ||
1976 (R1_CURRENT_STATE(cmd
.resp
[0]) == R1_STATE_PRG
));
1982 * mmc_erase - erase sectors.
1983 * @card: card to erase
1984 * @from: first sector to erase
1985 * @nr: number of sectors to erase
1986 * @arg: erase command argument (SD supports only %MMC_ERASE_ARG)
1988 * Caller must claim host before calling this function.
1990 int mmc_erase(struct mmc_card
*card
, unsigned int from
, unsigned int nr
,
1993 unsigned int rem
, to
= from
+ nr
;
1995 if (!(card
->host
->caps
& MMC_CAP_ERASE
) ||
1996 !(card
->csd
.cmdclass
& CCC_ERASE
))
1999 if (!card
->erase_size
)
2002 if (mmc_card_sd(card
) && arg
!= MMC_ERASE_ARG
)
2005 if ((arg
& MMC_SECURE_ARGS
) &&
2006 !(card
->ext_csd
.sec_feature_support
& EXT_CSD_SEC_ER_EN
))
2009 if ((arg
& MMC_TRIM_ARGS
) &&
2010 !(card
->ext_csd
.sec_feature_support
& EXT_CSD_SEC_GB_CL_EN
))
2013 if (arg
== MMC_SECURE_ERASE_ARG
) {
2014 if (from
% card
->erase_size
|| nr
% card
->erase_size
)
2018 if (arg
== MMC_ERASE_ARG
) {
2019 rem
= from
% card
->erase_size
;
2021 rem
= card
->erase_size
- rem
;
2028 rem
= nr
% card
->erase_size
;
2041 /* 'from' and 'to' are inclusive */
2044 return mmc_do_erase(card
, from
, to
, arg
);
2046 EXPORT_SYMBOL(mmc_erase
);
2048 int mmc_can_erase(struct mmc_card
*card
)
2050 if ((card
->host
->caps
& MMC_CAP_ERASE
) &&
2051 (card
->csd
.cmdclass
& CCC_ERASE
) && card
->erase_size
)
2055 EXPORT_SYMBOL(mmc_can_erase
);
2057 int mmc_can_trim(struct mmc_card
*card
)
2059 if (card
->ext_csd
.sec_feature_support
& EXT_CSD_SEC_GB_CL_EN
)
2063 EXPORT_SYMBOL(mmc_can_trim
);
2065 int mmc_can_discard(struct mmc_card
*card
)
2068 * As there's no way to detect the discard support bit at v4.5
2069 * use the s/w feature support filed.
2071 if (card
->ext_csd
.feature_support
& MMC_DISCARD_FEATURE
)
2075 EXPORT_SYMBOL(mmc_can_discard
);
2077 int mmc_can_sanitize(struct mmc_card
*card
)
2079 if (!mmc_can_trim(card
) && !mmc_can_erase(card
))
2081 if (card
->ext_csd
.sec_feature_support
& EXT_CSD_SEC_SANITIZE
)
2085 EXPORT_SYMBOL(mmc_can_sanitize
);
2087 int mmc_can_secure_erase_trim(struct mmc_card
*card
)
2089 if (card
->ext_csd
.sec_feature_support
& EXT_CSD_SEC_ER_EN
)
2093 EXPORT_SYMBOL(mmc_can_secure_erase_trim
);
2095 int mmc_erase_group_aligned(struct mmc_card
*card
, unsigned int from
,
2098 if (!card
->erase_size
)
2100 if (from
% card
->erase_size
|| nr
% card
->erase_size
)
2104 EXPORT_SYMBOL(mmc_erase_group_aligned
);
2106 static unsigned int mmc_do_calc_max_discard(struct mmc_card
*card
,
2109 struct mmc_host
*host
= card
->host
;
2110 unsigned int max_discard
, x
, y
, qty
= 0, max_qty
, timeout
;
2111 unsigned int last_timeout
= 0;
2113 if (card
->erase_shift
)
2114 max_qty
= UINT_MAX
>> card
->erase_shift
;
2115 else if (mmc_card_sd(card
))
2118 max_qty
= UINT_MAX
/ card
->erase_size
;
2120 /* Find the largest qty with an OK timeout */
2123 for (x
= 1; x
&& x
<= max_qty
&& max_qty
- x
>= qty
; x
<<= 1) {
2124 timeout
= mmc_erase_timeout(card
, arg
, qty
+ x
);
2125 if (timeout
> host
->max_busy_timeout
)
2127 if (timeout
< last_timeout
)
2129 last_timeout
= timeout
;
2141 /* Convert qty to sectors */
2142 if (card
->erase_shift
)
2143 max_discard
= --qty
<< card
->erase_shift
;
2144 else if (mmc_card_sd(card
))
2147 max_discard
= --qty
* card
->erase_size
;
2152 unsigned int mmc_calc_max_discard(struct mmc_card
*card
)
2154 struct mmc_host
*host
= card
->host
;
2155 unsigned int max_discard
, max_trim
;
2157 if (!host
->max_busy_timeout
)
2161 * Without erase_group_def set, MMC erase timeout depends on clock
2162 * frequence which can change. In that case, the best choice is
2163 * just the preferred erase size.
2165 if (mmc_card_mmc(card
) && !(card
->ext_csd
.erase_group_def
& 1))
2166 return card
->pref_erase
;
2168 max_discard
= mmc_do_calc_max_discard(card
, MMC_ERASE_ARG
);
2169 if (mmc_can_trim(card
)) {
2170 max_trim
= mmc_do_calc_max_discard(card
, MMC_TRIM_ARG
);
2171 if (max_trim
< max_discard
)
2172 max_discard
= max_trim
;
2173 } else if (max_discard
< card
->erase_size
) {
2176 pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n",
2177 mmc_hostname(host
), max_discard
, host
->max_busy_timeout
);
2180 EXPORT_SYMBOL(mmc_calc_max_discard
);
2182 int mmc_set_blocklen(struct mmc_card
*card
, unsigned int blocklen
)
2184 struct mmc_command cmd
= {0};
2186 if (mmc_card_blockaddr(card
) || mmc_card_ddr_mode(card
))
2189 cmd
.opcode
= MMC_SET_BLOCKLEN
;
2191 cmd
.flags
= MMC_RSP_SPI_R1
| MMC_RSP_R1
| MMC_CMD_AC
;
2192 return mmc_wait_for_cmd(card
->host
, &cmd
, 5);
2194 EXPORT_SYMBOL(mmc_set_blocklen
);
2196 int mmc_set_blockcount(struct mmc_card
*card
, unsigned int blockcount
,
2199 struct mmc_command cmd
= {0};
2201 cmd
.opcode
= MMC_SET_BLOCK_COUNT
;
2202 cmd
.arg
= blockcount
& 0x0000FFFF;
2205 cmd
.flags
= MMC_RSP_SPI_R1
| MMC_RSP_R1
| MMC_CMD_AC
;
2206 return mmc_wait_for_cmd(card
->host
, &cmd
, 5);
2208 EXPORT_SYMBOL(mmc_set_blockcount
);
2210 static void mmc_hw_reset_for_init(struct mmc_host
*host
)
2212 if (!(host
->caps
& MMC_CAP_HW_RESET
) || !host
->ops
->hw_reset
)
2214 mmc_host_clk_hold(host
);
2215 host
->ops
->hw_reset(host
);
2216 mmc_host_clk_release(host
);
2219 int mmc_can_reset(struct mmc_card
*card
)
2223 if (!mmc_card_mmc(card
))
2225 rst_n_function
= card
->ext_csd
.rst_n_function
;
2226 if ((rst_n_function
& EXT_CSD_RST_N_EN_MASK
) != EXT_CSD_RST_N_ENABLED
)
2230 EXPORT_SYMBOL(mmc_can_reset
);
2232 static int mmc_do_hw_reset(struct mmc_host
*host
, int check
)
2234 struct mmc_card
*card
= host
->card
;
2236 if (!(host
->caps
& MMC_CAP_HW_RESET
) || !host
->ops
->hw_reset
)
2242 if (!mmc_can_reset(card
))
2245 mmc_host_clk_hold(host
);
2246 mmc_set_clock(host
, host
->f_init
);
2248 host
->ops
->hw_reset(host
);
2250 /* If the reset has happened, then a status command will fail */
2252 struct mmc_command cmd
= {0};
2255 cmd
.opcode
= MMC_SEND_STATUS
;
2256 if (!mmc_host_is_spi(card
->host
))
2257 cmd
.arg
= card
->rca
<< 16;
2258 cmd
.flags
= MMC_RSP_SPI_R2
| MMC_RSP_R1
| MMC_CMD_AC
;
2259 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 0);
2261 mmc_host_clk_release(host
);
2266 host
->card
->state
&= ~(MMC_STATE_HIGHSPEED
| MMC_STATE_HIGHSPEED_DDR
);
2267 if (mmc_host_is_spi(host
)) {
2268 host
->ios
.chip_select
= MMC_CS_HIGH
;
2269 host
->ios
.bus_mode
= MMC_BUSMODE_PUSHPULL
;
2271 host
->ios
.chip_select
= MMC_CS_DONTCARE
;
2272 host
->ios
.bus_mode
= MMC_BUSMODE_OPENDRAIN
;
2274 host
->ios
.bus_width
= MMC_BUS_WIDTH_1
;
2275 host
->ios
.timing
= MMC_TIMING_LEGACY
;
2278 mmc_host_clk_release(host
);
2280 return host
->bus_ops
->power_restore(host
);
2283 int mmc_hw_reset(struct mmc_host
*host
)
2285 return mmc_do_hw_reset(host
, 0);
2287 EXPORT_SYMBOL(mmc_hw_reset
);
2289 int mmc_hw_reset_check(struct mmc_host
*host
)
2291 return mmc_do_hw_reset(host
, 1);
2293 EXPORT_SYMBOL(mmc_hw_reset_check
);
2295 static int mmc_rescan_try_freq(struct mmc_host
*host
, unsigned freq
)
2297 host
->f_init
= freq
;
2299 #ifdef CONFIG_MMC_DEBUG
2300 pr_info("%s: %s: trying to init card at %u Hz\n",
2301 mmc_hostname(host
), __func__
, host
->f_init
);
2303 mmc_power_up(host
, host
->ocr_avail
);
2306 * Some eMMCs (with VCCQ always on) may not be reset after power up, so
2307 * do a hardware reset if possible.
2309 mmc_hw_reset_for_init(host
);
2312 * sdio_reset sends CMD52 to reset card. Since we do not know
2313 * if the card is being re-initialized, just send it. CMD52
2314 * should be ignored by SD/eMMC cards.
2319 mmc_send_if_cond(host
, host
->ocr_avail
);
2321 /* Order's important: probe SDIO, then SD, then MMC */
2322 if (!mmc_attach_sdio(host
))
2324 if (!mmc_attach_sd(host
))
2326 if (!mmc_attach_mmc(host
))
2329 mmc_power_off(host
);
2333 int _mmc_detect_card_removed(struct mmc_host
*host
)
2337 if (host
->caps
& MMC_CAP_NONREMOVABLE
)
2340 if (!host
->card
|| mmc_card_removed(host
->card
))
2343 ret
= host
->bus_ops
->alive(host
);
2346 * Card detect status and alive check may be out of sync if card is
2347 * removed slowly, when card detect switch changes while card/slot
2348 * pads are still contacted in hardware (refer to "SD Card Mechanical
2349 * Addendum, Appendix C: Card Detection Switch"). So reschedule a
2350 * detect work 200ms later for this case.
2352 if (!ret
&& host
->ops
->get_cd
&& !host
->ops
->get_cd(host
)) {
2353 mmc_detect_change(host
, msecs_to_jiffies(200));
2354 pr_debug("%s: card removed too slowly\n", mmc_hostname(host
));
2358 mmc_card_set_removed(host
->card
);
2359 pr_debug("%s: card remove detected\n", mmc_hostname(host
));
2365 int mmc_detect_card_removed(struct mmc_host
*host
)
2367 struct mmc_card
*card
= host
->card
;
2370 WARN_ON(!host
->claimed
);
2375 ret
= mmc_card_removed(card
);
2377 * The card will be considered unchanged unless we have been asked to
2378 * detect a change or host requires polling to provide card detection.
2380 if (!host
->detect_change
&& !(host
->caps
& MMC_CAP_NEEDS_POLL
))
2383 host
->detect_change
= 0;
2385 ret
= _mmc_detect_card_removed(host
);
2386 if (ret
&& (host
->caps
& MMC_CAP_NEEDS_POLL
)) {
2388 * Schedule a detect work as soon as possible to let a
2389 * rescan handle the card removal.
2391 cancel_delayed_work(&host
->detect
);
2392 _mmc_detect_change(host
, 0, false);
2398 EXPORT_SYMBOL(mmc_detect_card_removed
);
2400 void mmc_rescan(struct work_struct
*work
)
2402 struct mmc_host
*host
=
2403 container_of(work
, struct mmc_host
, detect
.work
);
2406 if (host
->rescan_disable
)
2409 /* If there is a non-removable card registered, only scan once */
2410 if ((host
->caps
& MMC_CAP_NONREMOVABLE
) && host
->rescan_entered
)
2412 host
->rescan_entered
= 1;
2417 * if there is a _removable_ card registered, check whether it is
2420 if (host
->bus_ops
&& !host
->bus_dead
2421 && !(host
->caps
& MMC_CAP_NONREMOVABLE
))
2422 host
->bus_ops
->detect(host
);
2424 host
->detect_change
= 0;
2427 * Let mmc_bus_put() free the bus/bus_ops if we've found that
2428 * the card is no longer present.
2433 /* if there still is a card present, stop here */
2434 if (host
->bus_ops
!= NULL
) {
2440 * Only we can add a new handler, so it's safe to
2441 * release the lock here.
2445 if (!(host
->caps
& MMC_CAP_NONREMOVABLE
) && host
->ops
->get_cd
&&
2446 host
->ops
->get_cd(host
) == 0) {
2447 mmc_claim_host(host
);
2448 mmc_power_off(host
);
2449 mmc_release_host(host
);
2453 mmc_claim_host(host
);
2454 for (i
= 0; i
< ARRAY_SIZE(freqs
); i
++) {
2455 if (!mmc_rescan_try_freq(host
, max(freqs
[i
], host
->f_min
)))
2457 if (freqs
[i
] <= host
->f_min
)
2460 mmc_release_host(host
);
2463 if (host
->caps
& MMC_CAP_NEEDS_POLL
)
2464 mmc_schedule_delayed_work(&host
->detect
, HZ
);
2467 void mmc_start_host(struct mmc_host
*host
)
2469 host
->f_init
= max(freqs
[0], host
->f_min
);
2470 host
->rescan_disable
= 0;
2471 if (host
->caps2
& MMC_CAP2_NO_PRESCAN_POWERUP
)
2472 mmc_power_off(host
);
2474 mmc_power_up(host
, host
->ocr_avail
);
2475 mmc_gpiod_request_cd_irq(host
);
2476 _mmc_detect_change(host
, 0, false);
2479 void mmc_stop_host(struct mmc_host
*host
)
2481 #ifdef CONFIG_MMC_DEBUG
2482 unsigned long flags
;
2483 spin_lock_irqsave(&host
->lock
, flags
);
2485 spin_unlock_irqrestore(&host
->lock
, flags
);
2487 if (host
->slot
.cd_irq
>= 0)
2488 disable_irq(host
->slot
.cd_irq
);
2490 host
->rescan_disable
= 1;
2491 cancel_delayed_work_sync(&host
->detect
);
2492 mmc_flush_scheduled_work();
2494 /* clear pm flags now and let card drivers set them as needed */
2498 if (host
->bus_ops
&& !host
->bus_dead
) {
2499 /* Calling bus_ops->remove() with a claimed host can deadlock */
2500 host
->bus_ops
->remove(host
);
2501 mmc_claim_host(host
);
2502 mmc_detach_bus(host
);
2503 mmc_power_off(host
);
2504 mmc_release_host(host
);
2512 mmc_power_off(host
);
2515 int mmc_power_save_host(struct mmc_host
*host
)
2519 #ifdef CONFIG_MMC_DEBUG
2520 pr_info("%s: %s: powering down\n", mmc_hostname(host
), __func__
);
2525 if (!host
->bus_ops
|| host
->bus_dead
) {
2530 if (host
->bus_ops
->power_save
)
2531 ret
= host
->bus_ops
->power_save(host
);
2535 mmc_power_off(host
);
2539 EXPORT_SYMBOL(mmc_power_save_host
);
2541 int mmc_power_restore_host(struct mmc_host
*host
)
2545 #ifdef CONFIG_MMC_DEBUG
2546 pr_info("%s: %s: powering up\n", mmc_hostname(host
), __func__
);
2551 if (!host
->bus_ops
|| host
->bus_dead
) {
2556 mmc_power_up(host
, host
->card
->ocr
);
2557 ret
= host
->bus_ops
->power_restore(host
);
2563 EXPORT_SYMBOL(mmc_power_restore_host
);
2566 * Flush the cache to the non-volatile storage.
2568 int mmc_flush_cache(struct mmc_card
*card
)
2572 if (mmc_card_mmc(card
) &&
2573 (card
->ext_csd
.cache_size
> 0) &&
2574 (card
->ext_csd
.cache_ctrl
& 1)) {
2575 err
= mmc_switch(card
, EXT_CSD_CMD_SET_NORMAL
,
2576 EXT_CSD_FLUSH_CACHE
, 1, 0);
2578 pr_err("%s: cache flush error %d\n",
2579 mmc_hostname(card
->host
), err
);
2584 EXPORT_SYMBOL(mmc_flush_cache
);
2588 /* Do the card removal on suspend if card is assumed removeable
2589 * Do that in pm notifier while userspace isn't yet frozen, so we will be able
2592 int mmc_pm_notify(struct notifier_block
*notify_block
,
2593 unsigned long mode
, void *unused
)
2595 struct mmc_host
*host
= container_of(
2596 notify_block
, struct mmc_host
, pm_notify
);
2597 unsigned long flags
;
2601 case PM_HIBERNATION_PREPARE
:
2602 case PM_SUSPEND_PREPARE
:
2603 spin_lock_irqsave(&host
->lock
, flags
);
2604 host
->rescan_disable
= 1;
2605 spin_unlock_irqrestore(&host
->lock
, flags
);
2606 cancel_delayed_work_sync(&host
->detect
);
2611 /* Validate prerequisites for suspend */
2612 if (host
->bus_ops
->pre_suspend
)
2613 err
= host
->bus_ops
->pre_suspend(host
);
2617 /* Calling bus_ops->remove() with a claimed host can deadlock */
2618 host
->bus_ops
->remove(host
);
2619 mmc_claim_host(host
);
2620 mmc_detach_bus(host
);
2621 mmc_power_off(host
);
2622 mmc_release_host(host
);
2626 case PM_POST_SUSPEND
:
2627 case PM_POST_HIBERNATION
:
2628 case PM_POST_RESTORE
:
2630 spin_lock_irqsave(&host
->lock
, flags
);
2631 host
->rescan_disable
= 0;
2632 spin_unlock_irqrestore(&host
->lock
, flags
);
2633 _mmc_detect_change(host
, 0, false);
2642 * mmc_init_context_info() - init synchronization context
2645 * Init struct context_info needed to implement asynchronous
2646 * request mechanism, used by mmc core, host driver and mmc requests
2649 void mmc_init_context_info(struct mmc_host
*host
)
2651 spin_lock_init(&host
->context_info
.lock
);
2652 host
->context_info
.is_new_req
= false;
2653 host
->context_info
.is_done_rcv
= false;
2654 host
->context_info
.is_waiting_last_req
= false;
2655 init_waitqueue_head(&host
->context_info
.wait
);
2658 static int __init
mmc_init(void)
2662 workqueue
= alloc_ordered_workqueue("kmmcd", 0);
2666 ret
= mmc_register_bus();
2668 goto destroy_workqueue
;
2670 ret
= mmc_register_host_class();
2672 goto unregister_bus
;
2674 ret
= sdio_register_bus();
2676 goto unregister_host_class
;
2680 unregister_host_class
:
2681 mmc_unregister_host_class();
2683 mmc_unregister_bus();
2685 destroy_workqueue(workqueue
);
2690 static void __exit
mmc_exit(void)
2692 sdio_unregister_bus();
2693 mmc_unregister_host_class();
2694 mmc_unregister_bus();
2695 destroy_workqueue(workqueue
);
2698 subsys_initcall(mmc_init
);
2699 module_exit(mmc_exit
);
2701 MODULE_LICENSE("GPL");