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/suspend.h>
27 #include <linux/fault-inject.h>
28 #include <linux/random.h>
29 #include <linux/slab.h>
31 #include <linux/mmc/card.h>
32 #include <linux/mmc/host.h>
33 #include <linux/mmc/mmc.h>
34 #include <linux/mmc/sd.h>
45 /* If the device is not responding */
46 #define MMC_CORE_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute timeout */
49 * Background operations can take a long time, depending on the housekeeping
50 * operations the card has to perform.
52 #define MMC_BKOPS_MAX_TIMEOUT (4 * 60 * 1000) /* max time to wait in ms */
54 static struct workqueue_struct
*workqueue
;
55 static const unsigned freqs
[] = { 400000, 300000, 200000, 100000 };
58 * Enabling software CRCs on the data blocks can be a significant (30%)
59 * performance cost, and for other reasons may not always be desired.
60 * So we allow it it to be disabled.
63 module_param(use_spi_crc
, bool, 0);
66 * We normally treat cards as removed during suspend if they are not
67 * known to be on a non-removable bus, to avoid the risk of writing
68 * back data to a different card after resume. Allow this to be
69 * overridden if necessary.
71 #ifdef CONFIG_MMC_UNSAFE_RESUME
72 bool mmc_assume_removable
;
74 bool mmc_assume_removable
= 1;
76 EXPORT_SYMBOL(mmc_assume_removable
);
77 module_param_named(removable
, mmc_assume_removable
, bool, 0644);
80 "MMC/SD cards are removable and may be removed during suspend");
83 * Internal function. Schedule delayed work in the MMC work queue.
85 static int mmc_schedule_delayed_work(struct delayed_work
*work
,
88 return queue_delayed_work(workqueue
, work
, delay
);
92 * Internal function. Flush all scheduled work from the MMC work queue.
94 static void mmc_flush_scheduled_work(void)
96 flush_workqueue(workqueue
);
99 #ifdef CONFIG_FAIL_MMC_REQUEST
102 * Internal function. Inject random data errors.
103 * If mmc_data is NULL no errors are injected.
105 static void mmc_should_fail_request(struct mmc_host
*host
,
106 struct mmc_request
*mrq
)
108 struct mmc_command
*cmd
= mrq
->cmd
;
109 struct mmc_data
*data
= mrq
->data
;
110 static const int data_errors
[] = {
119 if (cmd
->error
|| data
->error
||
120 !should_fail(&host
->fail_mmc_request
, data
->blksz
* data
->blocks
))
123 data
->error
= data_errors
[random32() % ARRAY_SIZE(data_errors
)];
124 data
->bytes_xfered
= (random32() % (data
->bytes_xfered
>> 9)) << 9;
127 #else /* CONFIG_FAIL_MMC_REQUEST */
129 static inline void mmc_should_fail_request(struct mmc_host
*host
,
130 struct mmc_request
*mrq
)
134 #endif /* CONFIG_FAIL_MMC_REQUEST */
137 * mmc_request_done - finish processing an MMC request
138 * @host: MMC host which completed request
139 * @mrq: MMC request which request
141 * MMC drivers should call this function when they have completed
142 * their processing of a request.
144 void mmc_request_done(struct mmc_host
*host
, struct mmc_request
*mrq
)
146 struct mmc_command
*cmd
= mrq
->cmd
;
147 int err
= cmd
->error
;
149 if (err
&& cmd
->retries
&& mmc_host_is_spi(host
)) {
150 if (cmd
->resp
[0] & R1_SPI_ILLEGAL_COMMAND
)
154 if (err
&& cmd
->retries
&& !mmc_card_removed(host
->card
)) {
156 * Request starter must handle retries - see
157 * mmc_wait_for_req_done().
162 mmc_should_fail_request(host
, mrq
);
164 led_trigger_event(host
->led
, LED_OFF
);
166 pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n",
167 mmc_hostname(host
), cmd
->opcode
, err
,
168 cmd
->resp
[0], cmd
->resp
[1],
169 cmd
->resp
[2], cmd
->resp
[3]);
172 pr_debug("%s: %d bytes transferred: %d\n",
174 mrq
->data
->bytes_xfered
, mrq
->data
->error
);
178 pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n",
179 mmc_hostname(host
), mrq
->stop
->opcode
,
181 mrq
->stop
->resp
[0], mrq
->stop
->resp
[1],
182 mrq
->stop
->resp
[2], mrq
->stop
->resp
[3]);
188 mmc_host_clk_release(host
);
192 EXPORT_SYMBOL(mmc_request_done
);
195 mmc_start_request(struct mmc_host
*host
, struct mmc_request
*mrq
)
197 #ifdef CONFIG_MMC_DEBUG
199 struct scatterlist
*sg
;
203 pr_debug("<%s: starting CMD%u arg %08x flags %08x>\n",
204 mmc_hostname(host
), mrq
->sbc
->opcode
,
205 mrq
->sbc
->arg
, mrq
->sbc
->flags
);
208 pr_debug("%s: starting CMD%u arg %08x flags %08x\n",
209 mmc_hostname(host
), mrq
->cmd
->opcode
,
210 mrq
->cmd
->arg
, mrq
->cmd
->flags
);
213 pr_debug("%s: blksz %d blocks %d flags %08x "
214 "tsac %d ms nsac %d\n",
215 mmc_hostname(host
), mrq
->data
->blksz
,
216 mrq
->data
->blocks
, mrq
->data
->flags
,
217 mrq
->data
->timeout_ns
/ 1000000,
218 mrq
->data
->timeout_clks
);
222 pr_debug("%s: CMD%u arg %08x flags %08x\n",
223 mmc_hostname(host
), mrq
->stop
->opcode
,
224 mrq
->stop
->arg
, mrq
->stop
->flags
);
227 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
);
259 * mmc_start_bkops - start BKOPS for supported cards
260 * @card: MMC card to start BKOPS
261 * @form_exception: A flag to indicate if this function was
262 * called due to an exception raised by the card
264 * Start background operations whenever requested.
265 * When the urgent BKOPS bit is set in a R1 command response
266 * then background operations should be started immediately.
268 void mmc_start_bkops(struct mmc_card
*card
, bool from_exception
)
272 bool use_busy_signal
;
276 if (!card
->ext_csd
.bkops_en
|| mmc_card_doing_bkops(card
))
279 err
= mmc_read_bkops_status(card
);
281 pr_err("%s: Failed to read bkops status: %d\n",
282 mmc_hostname(card
->host
), err
);
286 if (!card
->ext_csd
.raw_bkops_status
)
289 if (card
->ext_csd
.raw_bkops_status
< EXT_CSD_BKOPS_LEVEL_2
&&
293 mmc_claim_host(card
->host
);
294 if (card
->ext_csd
.raw_bkops_status
>= EXT_CSD_BKOPS_LEVEL_2
) {
295 timeout
= MMC_BKOPS_MAX_TIMEOUT
;
296 use_busy_signal
= true;
299 use_busy_signal
= false;
302 err
= __mmc_switch(card
, EXT_CSD_CMD_SET_NORMAL
,
303 EXT_CSD_BKOPS_START
, 1, timeout
, use_busy_signal
);
305 pr_warn("%s: Error %d starting bkops\n",
306 mmc_hostname(card
->host
), err
);
311 * For urgent bkops status (LEVEL_2 and more)
312 * bkops executed synchronously, otherwise
313 * the operation is in progress
315 if (!use_busy_signal
)
316 mmc_card_set_doing_bkops(card
);
318 mmc_release_host(card
->host
);
320 EXPORT_SYMBOL(mmc_start_bkops
);
323 * mmc_wait_data_done() - done callback for data request
324 * @mrq: done data request
326 * Wakes up mmc context, passed as a callback to host controller driver
328 static void mmc_wait_data_done(struct mmc_request
*mrq
)
330 mrq
->host
->context_info
.is_done_rcv
= true;
331 wake_up_interruptible(&mrq
->host
->context_info
.wait
);
334 static void mmc_wait_done(struct mmc_request
*mrq
)
336 complete(&mrq
->completion
);
340 *__mmc_start_data_req() - starts data request
341 * @host: MMC host to start the request
342 * @mrq: data request to start
344 * Sets the done callback to be called when request is completed by the card.
345 * Starts data mmc request execution
347 static int __mmc_start_data_req(struct mmc_host
*host
, struct mmc_request
*mrq
)
349 mrq
->done
= mmc_wait_data_done
;
351 if (mmc_card_removed(host
->card
)) {
352 mrq
->cmd
->error
= -ENOMEDIUM
;
353 mmc_wait_data_done(mrq
);
356 mmc_start_request(host
, mrq
);
361 static int __mmc_start_req(struct mmc_host
*host
, struct mmc_request
*mrq
)
363 init_completion(&mrq
->completion
);
364 mrq
->done
= mmc_wait_done
;
365 if (mmc_card_removed(host
->card
)) {
366 mrq
->cmd
->error
= -ENOMEDIUM
;
367 complete(&mrq
->completion
);
370 mmc_start_request(host
, mrq
);
375 * mmc_wait_for_data_req_done() - wait for request completed
376 * @host: MMC host to prepare the command.
377 * @mrq: MMC request to wait for
379 * Blocks MMC context till host controller will ack end of data request
380 * execution or new request notification arrives from the block layer.
381 * Handles command retries.
383 * Returns enum mmc_blk_status after checking errors.
385 static int mmc_wait_for_data_req_done(struct mmc_host
*host
,
386 struct mmc_request
*mrq
,
387 struct mmc_async_req
*next_req
)
389 struct mmc_command
*cmd
;
390 struct mmc_context_info
*context_info
= &host
->context_info
;
395 wait_event_interruptible(context_info
->wait
,
396 (context_info
->is_done_rcv
||
397 context_info
->is_new_req
));
398 spin_lock_irqsave(&context_info
->lock
, flags
);
399 context_info
->is_waiting_last_req
= false;
400 spin_unlock_irqrestore(&context_info
->lock
, flags
);
401 if (context_info
->is_done_rcv
) {
402 context_info
->is_done_rcv
= false;
403 context_info
->is_new_req
= false;
405 if (!cmd
->error
|| !cmd
->retries
||
406 mmc_card_removed(host
->card
)) {
407 err
= host
->areq
->err_check(host
->card
,
409 break; /* return err */
411 pr_info("%s: req failed (CMD%u): %d, retrying...\n",
413 cmd
->opcode
, cmd
->error
);
416 host
->ops
->request(host
, mrq
);
417 continue; /* wait for done/new event again */
419 } else if (context_info
->is_new_req
) {
420 context_info
->is_new_req
= false;
422 err
= MMC_BLK_NEW_REQUEST
;
423 break; /* return err */
430 static void mmc_wait_for_req_done(struct mmc_host
*host
,
431 struct mmc_request
*mrq
)
433 struct mmc_command
*cmd
;
436 wait_for_completion(&mrq
->completion
);
439 if (!cmd
->error
|| !cmd
->retries
||
440 mmc_card_removed(host
->card
))
443 pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
444 mmc_hostname(host
), cmd
->opcode
, cmd
->error
);
447 host
->ops
->request(host
, mrq
);
452 * mmc_pre_req - Prepare for a new request
453 * @host: MMC host to prepare command
454 * @mrq: MMC request to prepare for
455 * @is_first_req: true if there is no previous started request
456 * that may run in parellel to this call, otherwise false
458 * mmc_pre_req() is called in prior to mmc_start_req() to let
459 * host prepare for the new request. Preparation of a request may be
460 * performed while another request is running on the host.
462 static void mmc_pre_req(struct mmc_host
*host
, struct mmc_request
*mrq
,
465 if (host
->ops
->pre_req
) {
466 mmc_host_clk_hold(host
);
467 host
->ops
->pre_req(host
, mrq
, is_first_req
);
468 mmc_host_clk_release(host
);
473 * mmc_post_req - Post process a completed request
474 * @host: MMC host to post process command
475 * @mrq: MMC request to post process for
476 * @err: Error, if non zero, clean up any resources made in pre_req
478 * Let the host post process a completed request. Post processing of
479 * a request may be performed while another reuqest is running.
481 static void mmc_post_req(struct mmc_host
*host
, struct mmc_request
*mrq
,
484 if (host
->ops
->post_req
) {
485 mmc_host_clk_hold(host
);
486 host
->ops
->post_req(host
, mrq
, err
);
487 mmc_host_clk_release(host
);
492 * mmc_start_req - start a non-blocking request
493 * @host: MMC host to start command
494 * @areq: async request to start
495 * @error: out parameter returns 0 for success, otherwise non zero
497 * Start a new MMC custom command request for a host.
498 * If there is on ongoing async request wait for completion
499 * of that request and start the new one and return.
500 * Does not wait for the new request to complete.
502 * Returns the completed request, NULL in case of none completed.
503 * Wait for the an ongoing request (previoulsy started) to complete and
504 * return the completed request. If there is no ongoing request, NULL
505 * is returned without waiting. NULL is not an error condition.
507 struct mmc_async_req
*mmc_start_req(struct mmc_host
*host
,
508 struct mmc_async_req
*areq
, int *error
)
512 struct mmc_async_req
*data
= host
->areq
;
514 /* Prepare a new request */
516 mmc_pre_req(host
, areq
->mrq
, !host
->areq
);
519 err
= mmc_wait_for_data_req_done(host
, host
->areq
->mrq
,
521 if (err
== MMC_BLK_NEW_REQUEST
) {
525 * The previous request was not completed,
531 * Check BKOPS urgency for each R1 response
533 if (host
->card
&& mmc_card_mmc(host
->card
) &&
534 ((mmc_resp_type(host
->areq
->mrq
->cmd
) == MMC_RSP_R1
) ||
535 (mmc_resp_type(host
->areq
->mrq
->cmd
) == MMC_RSP_R1B
)) &&
536 (host
->areq
->mrq
->cmd
->resp
[0] & R1_EXCEPTION_EVENT
))
537 mmc_start_bkops(host
->card
, true);
541 start_err
= __mmc_start_data_req(host
, areq
->mrq
);
544 mmc_post_req(host
, host
->areq
->mrq
, 0);
546 /* Cancel a prepared request if it was not started. */
547 if ((err
|| start_err
) && areq
)
548 mmc_post_req(host
, areq
->mrq
, -EINVAL
);
559 EXPORT_SYMBOL(mmc_start_req
);
562 * mmc_wait_for_req - start a request and wait for completion
563 * @host: MMC host to start command
564 * @mrq: MMC request to start
566 * Start a new MMC custom command request for a host, and wait
567 * for the command to complete. Does not attempt to parse the
570 void mmc_wait_for_req(struct mmc_host
*host
, struct mmc_request
*mrq
)
572 __mmc_start_req(host
, mrq
);
573 mmc_wait_for_req_done(host
, mrq
);
575 EXPORT_SYMBOL(mmc_wait_for_req
);
578 * mmc_interrupt_hpi - Issue for High priority Interrupt
579 * @card: the MMC card associated with the HPI transfer
581 * Issued High Priority Interrupt, and check for card status
582 * until out-of prg-state.
584 int mmc_interrupt_hpi(struct mmc_card
*card
)
588 unsigned long prg_wait
;
592 if (!card
->ext_csd
.hpi_en
) {
593 pr_info("%s: HPI enable bit unset\n", mmc_hostname(card
->host
));
597 mmc_claim_host(card
->host
);
598 err
= mmc_send_status(card
, &status
);
600 pr_err("%s: Get card status fail\n", mmc_hostname(card
->host
));
604 switch (R1_CURRENT_STATE(status
)) {
610 * In idle and transfer states, HPI is not needed and the caller
611 * can issue the next intended command immediately
617 /* In all other states, it's illegal to issue HPI */
618 pr_debug("%s: HPI cannot be sent. Card state=%d\n",
619 mmc_hostname(card
->host
), R1_CURRENT_STATE(status
));
624 err
= mmc_send_hpi_cmd(card
, &status
);
628 prg_wait
= jiffies
+ msecs_to_jiffies(card
->ext_csd
.out_of_int_time
);
630 err
= mmc_send_status(card
, &status
);
632 if (!err
&& R1_CURRENT_STATE(status
) == R1_STATE_TRAN
)
634 if (time_after(jiffies
, prg_wait
))
639 mmc_release_host(card
->host
);
642 EXPORT_SYMBOL(mmc_interrupt_hpi
);
645 * mmc_wait_for_cmd - start a command and wait for completion
646 * @host: MMC host to start command
647 * @cmd: MMC command to start
648 * @retries: maximum number of retries
650 * Start a new MMC command for a host, and wait for the command
651 * to complete. Return any error that occurred while the command
652 * was executing. Do not attempt to parse the response.
654 int mmc_wait_for_cmd(struct mmc_host
*host
, struct mmc_command
*cmd
, int retries
)
656 struct mmc_request mrq
= {NULL
};
658 WARN_ON(!host
->claimed
);
660 memset(cmd
->resp
, 0, sizeof(cmd
->resp
));
661 cmd
->retries
= retries
;
666 mmc_wait_for_req(host
, &mrq
);
671 EXPORT_SYMBOL(mmc_wait_for_cmd
);
674 * mmc_stop_bkops - stop ongoing BKOPS
675 * @card: MMC card to check BKOPS
677 * Send HPI command to stop ongoing background operations to
678 * allow rapid servicing of foreground operations, e.g. read/
679 * writes. Wait until the card comes out of the programming state
680 * to avoid errors in servicing read/write requests.
682 int mmc_stop_bkops(struct mmc_card
*card
)
687 err
= mmc_interrupt_hpi(card
);
690 * If err is EINVAL, we can't issue an HPI.
691 * It should complete the BKOPS.
693 if (!err
|| (err
== -EINVAL
)) {
694 mmc_card_clr_doing_bkops(card
);
700 EXPORT_SYMBOL(mmc_stop_bkops
);
702 int mmc_read_bkops_status(struct mmc_card
*card
)
708 * In future work, we should consider storing the entire ext_csd.
710 ext_csd
= kmalloc(512, GFP_KERNEL
);
712 pr_err("%s: could not allocate buffer to receive the ext_csd.\n",
713 mmc_hostname(card
->host
));
717 mmc_claim_host(card
->host
);
718 err
= mmc_send_ext_csd(card
, ext_csd
);
719 mmc_release_host(card
->host
);
723 card
->ext_csd
.raw_bkops_status
= ext_csd
[EXT_CSD_BKOPS_STATUS
];
724 card
->ext_csd
.raw_exception_status
= ext_csd
[EXT_CSD_EXP_EVENTS_STATUS
];
729 EXPORT_SYMBOL(mmc_read_bkops_status
);
732 * mmc_set_data_timeout - set the timeout for a data command
733 * @data: data phase for command
734 * @card: the MMC card associated with the data transfer
736 * Computes the data timeout parameters according to the
737 * correct algorithm given the card type.
739 void mmc_set_data_timeout(struct mmc_data
*data
, const struct mmc_card
*card
)
744 * SDIO cards only define an upper 1 s limit on access.
746 if (mmc_card_sdio(card
)) {
747 data
->timeout_ns
= 1000000000;
748 data
->timeout_clks
= 0;
753 * SD cards use a 100 multiplier rather than 10
755 mult
= mmc_card_sd(card
) ? 100 : 10;
758 * Scale up the multiplier (and therefore the timeout) by
759 * the r2w factor for writes.
761 if (data
->flags
& MMC_DATA_WRITE
)
762 mult
<<= card
->csd
.r2w_factor
;
764 data
->timeout_ns
= card
->csd
.tacc_ns
* mult
;
765 data
->timeout_clks
= card
->csd
.tacc_clks
* mult
;
768 * SD cards also have an upper limit on the timeout.
770 if (mmc_card_sd(card
)) {
771 unsigned int timeout_us
, limit_us
;
773 timeout_us
= data
->timeout_ns
/ 1000;
774 if (mmc_host_clk_rate(card
->host
))
775 timeout_us
+= data
->timeout_clks
* 1000 /
776 (mmc_host_clk_rate(card
->host
) / 1000);
778 if (data
->flags
& MMC_DATA_WRITE
)
780 * The MMC spec "It is strongly recommended
781 * for hosts to implement more than 500ms
782 * timeout value even if the card indicates
783 * the 250ms maximum busy length." Even the
784 * previous value of 300ms is known to be
785 * insufficient for some cards.
792 * SDHC cards always use these fixed values.
794 if (timeout_us
> limit_us
|| mmc_card_blockaddr(card
)) {
795 data
->timeout_ns
= limit_us
* 1000;
796 data
->timeout_clks
= 0;
801 * Some cards require longer data read timeout than indicated in CSD.
802 * Address this by setting the read timeout to a "reasonably high"
803 * value. For the cards tested, 300ms has proven enough. If necessary,
804 * this value can be increased if other problematic cards require this.
806 if (mmc_card_long_read_time(card
) && data
->flags
& MMC_DATA_READ
) {
807 data
->timeout_ns
= 300000000;
808 data
->timeout_clks
= 0;
812 * Some cards need very high timeouts if driven in SPI mode.
813 * The worst observed timeout was 900ms after writing a
814 * continuous stream of data until the internal logic
817 if (mmc_host_is_spi(card
->host
)) {
818 if (data
->flags
& MMC_DATA_WRITE
) {
819 if (data
->timeout_ns
< 1000000000)
820 data
->timeout_ns
= 1000000000; /* 1s */
822 if (data
->timeout_ns
< 100000000)
823 data
->timeout_ns
= 100000000; /* 100ms */
827 EXPORT_SYMBOL(mmc_set_data_timeout
);
830 * mmc_align_data_size - pads a transfer size to a more optimal value
831 * @card: the MMC card associated with the data transfer
832 * @sz: original transfer size
834 * Pads the original data size with a number of extra bytes in
835 * order to avoid controller bugs and/or performance hits
836 * (e.g. some controllers revert to PIO for certain sizes).
838 * Returns the improved size, which might be unmodified.
840 * Note that this function is only relevant when issuing a
841 * single scatter gather entry.
843 unsigned int mmc_align_data_size(struct mmc_card
*card
, unsigned int sz
)
846 * FIXME: We don't have a system for the controller to tell
847 * the core about its problems yet, so for now we just 32-bit
850 sz
= ((sz
+ 3) / 4) * 4;
854 EXPORT_SYMBOL(mmc_align_data_size
);
857 * __mmc_claim_host - exclusively claim a host
858 * @host: mmc host to claim
859 * @abort: whether or not the operation should be aborted
861 * Claim a host for a set of operations. If @abort is non null and
862 * dereference a non-zero value then this will return prematurely with
863 * that non-zero value without acquiring the lock. Returns zero
864 * with the lock held otherwise.
866 int __mmc_claim_host(struct mmc_host
*host
, atomic_t
*abort
)
868 DECLARE_WAITQUEUE(wait
, current
);
874 add_wait_queue(&host
->wq
, &wait
);
875 spin_lock_irqsave(&host
->lock
, flags
);
877 set_current_state(TASK_UNINTERRUPTIBLE
);
878 stop
= abort
? atomic_read(abort
) : 0;
879 if (stop
|| !host
->claimed
|| host
->claimer
== current
)
881 spin_unlock_irqrestore(&host
->lock
, flags
);
883 spin_lock_irqsave(&host
->lock
, flags
);
885 set_current_state(TASK_RUNNING
);
888 host
->claimer
= current
;
889 host
->claim_cnt
+= 1;
892 spin_unlock_irqrestore(&host
->lock
, flags
);
893 remove_wait_queue(&host
->wq
, &wait
);
894 if (host
->ops
->enable
&& !stop
&& host
->claim_cnt
== 1)
895 host
->ops
->enable(host
);
899 EXPORT_SYMBOL(__mmc_claim_host
);
902 * mmc_try_claim_host - try exclusively to claim a host
903 * @host: mmc host to claim
905 * Returns %1 if the host is claimed, %0 otherwise.
907 int mmc_try_claim_host(struct mmc_host
*host
)
909 int claimed_host
= 0;
912 spin_lock_irqsave(&host
->lock
, flags
);
913 if (!host
->claimed
|| host
->claimer
== current
) {
915 host
->claimer
= current
;
916 host
->claim_cnt
+= 1;
919 spin_unlock_irqrestore(&host
->lock
, flags
);
920 if (host
->ops
->enable
&& claimed_host
&& host
->claim_cnt
== 1)
921 host
->ops
->enable(host
);
924 EXPORT_SYMBOL(mmc_try_claim_host
);
927 * mmc_release_host - release a host
928 * @host: mmc host to release
930 * Release a MMC host, allowing others to claim the host
931 * for their operations.
933 void mmc_release_host(struct mmc_host
*host
)
937 WARN_ON(!host
->claimed
);
939 if (host
->ops
->disable
&& host
->claim_cnt
== 1)
940 host
->ops
->disable(host
);
942 spin_lock_irqsave(&host
->lock
, flags
);
943 if (--host
->claim_cnt
) {
944 /* Release for nested claim */
945 spin_unlock_irqrestore(&host
->lock
, flags
);
948 host
->claimer
= NULL
;
949 spin_unlock_irqrestore(&host
->lock
, flags
);
953 EXPORT_SYMBOL(mmc_release_host
);
956 * Internal function that does the actual ios call to the host driver,
957 * optionally printing some debug output.
959 static inline void mmc_set_ios(struct mmc_host
*host
)
961 struct mmc_ios
*ios
= &host
->ios
;
963 pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u "
964 "width %u timing %u\n",
965 mmc_hostname(host
), ios
->clock
, ios
->bus_mode
,
966 ios
->power_mode
, ios
->chip_select
, ios
->vdd
,
967 ios
->bus_width
, ios
->timing
);
970 mmc_set_ungated(host
);
971 host
->ops
->set_ios(host
, ios
);
975 * Control chip select pin on a host.
977 void mmc_set_chip_select(struct mmc_host
*host
, int mode
)
979 mmc_host_clk_hold(host
);
980 host
->ios
.chip_select
= mode
;
982 mmc_host_clk_release(host
);
986 * Sets the host clock to the highest possible frequency that
989 static void __mmc_set_clock(struct mmc_host
*host
, unsigned int hz
)
991 WARN_ON(hz
< host
->f_min
);
993 if (hz
> host
->f_max
)
996 host
->ios
.clock
= hz
;
1000 void mmc_set_clock(struct mmc_host
*host
, unsigned int hz
)
1002 mmc_host_clk_hold(host
);
1003 __mmc_set_clock(host
, hz
);
1004 mmc_host_clk_release(host
);
1007 #ifdef CONFIG_MMC_CLKGATE
1009 * This gates the clock by setting it to 0 Hz.
1011 void mmc_gate_clock(struct mmc_host
*host
)
1013 unsigned long flags
;
1015 spin_lock_irqsave(&host
->clk_lock
, flags
);
1016 host
->clk_old
= host
->ios
.clock
;
1017 host
->ios
.clock
= 0;
1018 host
->clk_gated
= true;
1019 spin_unlock_irqrestore(&host
->clk_lock
, flags
);
1024 * This restores the clock from gating by using the cached
1027 void mmc_ungate_clock(struct mmc_host
*host
)
1030 * We should previously have gated the clock, so the clock shall
1031 * be 0 here! The clock may however be 0 during initialization,
1032 * when some request operations are performed before setting
1033 * the frequency. When ungate is requested in that situation
1034 * we just ignore the call.
1036 if (host
->clk_old
) {
1037 BUG_ON(host
->ios
.clock
);
1038 /* This call will also set host->clk_gated to false */
1039 __mmc_set_clock(host
, host
->clk_old
);
1043 void mmc_set_ungated(struct mmc_host
*host
)
1045 unsigned long flags
;
1048 * We've been given a new frequency while the clock is gated,
1049 * so make sure we regard this as ungating it.
1051 spin_lock_irqsave(&host
->clk_lock
, flags
);
1052 host
->clk_gated
= false;
1053 spin_unlock_irqrestore(&host
->clk_lock
, flags
);
1057 void mmc_set_ungated(struct mmc_host
*host
)
1063 * Change the bus mode (open drain/push-pull) of a host.
1065 void mmc_set_bus_mode(struct mmc_host
*host
, unsigned int mode
)
1067 mmc_host_clk_hold(host
);
1068 host
->ios
.bus_mode
= mode
;
1070 mmc_host_clk_release(host
);
1074 * Change data bus width of a host.
1076 void mmc_set_bus_width(struct mmc_host
*host
, unsigned int width
)
1078 mmc_host_clk_hold(host
);
1079 host
->ios
.bus_width
= width
;
1081 mmc_host_clk_release(host
);
1085 * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number
1086 * @vdd: voltage (mV)
1087 * @low_bits: prefer low bits in boundary cases
1089 * This function returns the OCR bit number according to the provided @vdd
1090 * value. If conversion is not possible a negative errno value returned.
1092 * Depending on the @low_bits flag the function prefers low or high OCR bits
1093 * on boundary voltages. For example,
1094 * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33);
1095 * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34);
1097 * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21).
1099 static int mmc_vdd_to_ocrbitnum(int vdd
, bool low_bits
)
1101 const int max_bit
= ilog2(MMC_VDD_35_36
);
1104 if (vdd
< 1650 || vdd
> 3600)
1107 if (vdd
>= 1650 && vdd
<= 1950)
1108 return ilog2(MMC_VDD_165_195
);
1113 /* Base 2000 mV, step 100 mV, bit's base 8. */
1114 bit
= (vdd
- 2000) / 100 + 8;
1121 * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask
1122 * @vdd_min: minimum voltage value (mV)
1123 * @vdd_max: maximum voltage value (mV)
1125 * This function returns the OCR mask bits according to the provided @vdd_min
1126 * and @vdd_max values. If conversion is not possible the function returns 0.
1128 * Notes wrt boundary cases:
1129 * This function sets the OCR bits for all boundary voltages, for example
1130 * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 |
1131 * MMC_VDD_34_35 mask.
1133 u32
mmc_vddrange_to_ocrmask(int vdd_min
, int vdd_max
)
1137 if (vdd_max
< vdd_min
)
1140 /* Prefer high bits for the boundary vdd_max values. */
1141 vdd_max
= mmc_vdd_to_ocrbitnum(vdd_max
, false);
1145 /* Prefer low bits for the boundary vdd_min values. */
1146 vdd_min
= mmc_vdd_to_ocrbitnum(vdd_min
, true);
1150 /* Fill the mask, from max bit to min bit. */
1151 while (vdd_max
>= vdd_min
)
1152 mask
|= 1 << vdd_max
--;
1156 EXPORT_SYMBOL(mmc_vddrange_to_ocrmask
);
1158 #ifdef CONFIG_REGULATOR
1161 * mmc_regulator_get_ocrmask - return mask of supported voltages
1162 * @supply: regulator to use
1164 * This returns either a negative errno, or a mask of voltages that
1165 * can be provided to MMC/SD/SDIO devices using the specified voltage
1166 * regulator. This would normally be called before registering the
1169 int mmc_regulator_get_ocrmask(struct regulator
*supply
)
1175 count
= regulator_count_voltages(supply
);
1179 for (i
= 0; i
< count
; i
++) {
1183 vdd_uV
= regulator_list_voltage(supply
, i
);
1187 vdd_mV
= vdd_uV
/ 1000;
1188 result
|= mmc_vddrange_to_ocrmask(vdd_mV
, vdd_mV
);
1193 EXPORT_SYMBOL_GPL(mmc_regulator_get_ocrmask
);
1196 * mmc_regulator_set_ocr - set regulator to match host->ios voltage
1197 * @mmc: the host to regulate
1198 * @supply: regulator to use
1199 * @vdd_bit: zero for power off, else a bit number (host->ios.vdd)
1201 * Returns zero on success, else negative errno.
1203 * MMC host drivers may use this to enable or disable a regulator using
1204 * a particular supply voltage. This would normally be called from the
1207 int mmc_regulator_set_ocr(struct mmc_host
*mmc
,
1208 struct regulator
*supply
,
1209 unsigned short vdd_bit
)
1219 * REVISIT mmc_vddrange_to_ocrmask() may have set some
1220 * bits this regulator doesn't quite support ... don't
1221 * be too picky, most cards and regulators are OK with
1222 * a 0.1V range goof (it's a small error percentage).
1224 tmp
= vdd_bit
- ilog2(MMC_VDD_165_195
);
1226 min_uV
= 1650 * 1000;
1227 max_uV
= 1950 * 1000;
1229 min_uV
= 1900 * 1000 + tmp
* 100 * 1000;
1230 max_uV
= min_uV
+ 100 * 1000;
1234 * If we're using a fixed/static regulator, don't call
1235 * regulator_set_voltage; it would fail.
1237 voltage
= regulator_get_voltage(supply
);
1239 if (regulator_count_voltages(supply
) == 1)
1240 min_uV
= max_uV
= voltage
;
1244 else if (voltage
< min_uV
|| voltage
> max_uV
)
1245 result
= regulator_set_voltage(supply
, min_uV
, max_uV
);
1249 if (result
== 0 && !mmc
->regulator_enabled
) {
1250 result
= regulator_enable(supply
);
1252 mmc
->regulator_enabled
= true;
1254 } else if (mmc
->regulator_enabled
) {
1255 result
= regulator_disable(supply
);
1257 mmc
->regulator_enabled
= false;
1261 dev_err(mmc_dev(mmc
),
1262 "could not set regulator OCR (%d)\n", result
);
1265 EXPORT_SYMBOL_GPL(mmc_regulator_set_ocr
);
1267 int mmc_regulator_get_supply(struct mmc_host
*mmc
)
1269 struct device
*dev
= mmc_dev(mmc
);
1270 struct regulator
*supply
;
1273 supply
= devm_regulator_get(dev
, "vmmc");
1274 mmc
->supply
.vmmc
= supply
;
1275 mmc
->supply
.vqmmc
= devm_regulator_get(dev
, "vqmmc");
1278 return PTR_ERR(supply
);
1280 ret
= mmc_regulator_get_ocrmask(supply
);
1282 mmc
->ocr_avail
= ret
;
1284 dev_warn(mmc_dev(mmc
), "Failed getting OCR mask: %d\n", ret
);
1288 EXPORT_SYMBOL_GPL(mmc_regulator_get_supply
);
1290 #endif /* CONFIG_REGULATOR */
1293 * Mask off any voltages we don't support and select
1294 * the lowest voltage
1296 u32
mmc_select_voltage(struct mmc_host
*host
, u32 ocr
)
1300 ocr
&= host
->ocr_avail
;
1308 mmc_host_clk_hold(host
);
1309 host
->ios
.vdd
= bit
;
1311 mmc_host_clk_release(host
);
1313 pr_warning("%s: host doesn't support card's voltages\n",
1314 mmc_hostname(host
));
1321 int __mmc_set_signal_voltage(struct mmc_host
*host
, int signal_voltage
)
1324 int old_signal_voltage
= host
->ios
.signal_voltage
;
1326 host
->ios
.signal_voltage
= signal_voltage
;
1327 if (host
->ops
->start_signal_voltage_switch
) {
1328 mmc_host_clk_hold(host
);
1329 err
= host
->ops
->start_signal_voltage_switch(host
, &host
->ios
);
1330 mmc_host_clk_release(host
);
1334 host
->ios
.signal_voltage
= old_signal_voltage
;
1340 int mmc_set_signal_voltage(struct mmc_host
*host
, int signal_voltage
)
1342 struct mmc_command cmd
= {0};
1349 * Send CMD11 only if the request is to switch the card to
1352 if (signal_voltage
== MMC_SIGNAL_VOLTAGE_330
)
1353 return __mmc_set_signal_voltage(host
, signal_voltage
);
1356 * If we cannot switch voltages, return failure so the caller
1357 * can continue without UHS mode
1359 if (!host
->ops
->start_signal_voltage_switch
)
1361 if (!host
->ops
->card_busy
)
1362 pr_warning("%s: cannot verify signal voltage switch\n",
1363 mmc_hostname(host
));
1365 cmd
.opcode
= SD_SWITCH_VOLTAGE
;
1367 cmd
.flags
= MMC_RSP_R1
| MMC_CMD_AC
;
1369 err
= mmc_wait_for_cmd(host
, &cmd
, 0);
1373 if (!mmc_host_is_spi(host
) && (cmd
.resp
[0] & R1_ERROR
))
1376 mmc_host_clk_hold(host
);
1378 * The card should drive cmd and dat[0:3] low immediately
1379 * after the response of cmd11, but wait 1 ms to be sure
1382 if (host
->ops
->card_busy
&& !host
->ops
->card_busy(host
)) {
1387 * During a signal voltage level switch, the clock must be gated
1388 * for 5 ms according to the SD spec
1390 clock
= host
->ios
.clock
;
1391 host
->ios
.clock
= 0;
1394 if (__mmc_set_signal_voltage(host
, signal_voltage
)) {
1396 * Voltages may not have been switched, but we've already
1397 * sent CMD11, so a power cycle is required anyway
1403 /* Keep clock gated for at least 5 ms */
1405 host
->ios
.clock
= clock
;
1408 /* Wait for at least 1 ms according to spec */
1412 * Failure to switch is indicated by the card holding
1415 if (host
->ops
->card_busy
&& host
->ops
->card_busy(host
))
1420 pr_debug("%s: Signal voltage switch failed, "
1421 "power cycling card\n", mmc_hostname(host
));
1422 mmc_power_cycle(host
);
1425 mmc_host_clk_release(host
);
1431 * Select timing parameters for host.
1433 void mmc_set_timing(struct mmc_host
*host
, unsigned int timing
)
1435 mmc_host_clk_hold(host
);
1436 host
->ios
.timing
= timing
;
1438 mmc_host_clk_release(host
);
1442 * Select appropriate driver type for host.
1444 void mmc_set_driver_type(struct mmc_host
*host
, unsigned int drv_type
)
1446 mmc_host_clk_hold(host
);
1447 host
->ios
.drv_type
= drv_type
;
1449 mmc_host_clk_release(host
);
1453 * Apply power to the MMC stack. This is a two-stage process.
1454 * First, we enable power to the card without the clock running.
1455 * We then wait a bit for the power to stabilise. Finally,
1456 * enable the bus drivers and clock to the card.
1458 * We must _NOT_ enable the clock prior to power stablising.
1460 * If a host does all the power sequencing itself, ignore the
1461 * initial MMC_POWER_UP stage.
1463 static void mmc_power_up(struct mmc_host
*host
)
1467 if (host
->ios
.power_mode
== MMC_POWER_ON
)
1470 mmc_host_clk_hold(host
);
1472 /* If ocr is set, we use it */
1474 bit
= ffs(host
->ocr
) - 1;
1476 bit
= fls(host
->ocr_avail
) - 1;
1478 host
->ios
.vdd
= bit
;
1479 if (mmc_host_is_spi(host
))
1480 host
->ios
.chip_select
= MMC_CS_HIGH
;
1482 host
->ios
.chip_select
= MMC_CS_DONTCARE
;
1483 host
->ios
.bus_mode
= MMC_BUSMODE_PUSHPULL
;
1484 host
->ios
.power_mode
= MMC_POWER_UP
;
1485 host
->ios
.bus_width
= MMC_BUS_WIDTH_1
;
1486 host
->ios
.timing
= MMC_TIMING_LEGACY
;
1489 /* Set signal voltage to 3.3V */
1490 __mmc_set_signal_voltage(host
, MMC_SIGNAL_VOLTAGE_330
);
1493 * This delay should be sufficient to allow the power supply
1494 * to reach the minimum voltage.
1498 host
->ios
.clock
= host
->f_init
;
1500 host
->ios
.power_mode
= MMC_POWER_ON
;
1504 * This delay must be at least 74 clock sizes, or 1 ms, or the
1505 * time required to reach a stable voltage.
1509 mmc_host_clk_release(host
);
1512 void mmc_power_off(struct mmc_host
*host
)
1514 if (host
->ios
.power_mode
== MMC_POWER_OFF
)
1517 mmc_host_clk_hold(host
);
1519 host
->ios
.clock
= 0;
1524 * Reset ocr mask to be the highest possible voltage supported for
1525 * this mmc host. This value will be used at next power up.
1527 host
->ocr
= 1 << (fls(host
->ocr_avail
) - 1);
1529 if (!mmc_host_is_spi(host
)) {
1530 host
->ios
.bus_mode
= MMC_BUSMODE_OPENDRAIN
;
1531 host
->ios
.chip_select
= MMC_CS_DONTCARE
;
1533 host
->ios
.power_mode
= MMC_POWER_OFF
;
1534 host
->ios
.bus_width
= MMC_BUS_WIDTH_1
;
1535 host
->ios
.timing
= MMC_TIMING_LEGACY
;
1539 * Some configurations, such as the 802.11 SDIO card in the OLPC
1540 * XO-1.5, require a short delay after poweroff before the card
1541 * can be successfully turned on again.
1545 mmc_host_clk_release(host
);
1548 void mmc_power_cycle(struct mmc_host
*host
)
1550 mmc_power_off(host
);
1551 /* Wait at least 1 ms according to SD spec */
1557 * Cleanup when the last reference to the bus operator is dropped.
1559 static void __mmc_release_bus(struct mmc_host
*host
)
1562 BUG_ON(host
->bus_refs
);
1563 BUG_ON(!host
->bus_dead
);
1565 host
->bus_ops
= NULL
;
1569 * Increase reference count of bus operator
1571 static inline void mmc_bus_get(struct mmc_host
*host
)
1573 unsigned long flags
;
1575 spin_lock_irqsave(&host
->lock
, flags
);
1577 spin_unlock_irqrestore(&host
->lock
, flags
);
1581 * Decrease reference count of bus operator and free it if
1582 * it is the last reference.
1584 static inline void mmc_bus_put(struct mmc_host
*host
)
1586 unsigned long flags
;
1588 spin_lock_irqsave(&host
->lock
, flags
);
1590 if ((host
->bus_refs
== 0) && host
->bus_ops
)
1591 __mmc_release_bus(host
);
1592 spin_unlock_irqrestore(&host
->lock
, flags
);
1596 * Assign a mmc bus handler to a host. Only one bus handler may control a
1597 * host at any given time.
1599 void mmc_attach_bus(struct mmc_host
*host
, const struct mmc_bus_ops
*ops
)
1601 unsigned long flags
;
1606 WARN_ON(!host
->claimed
);
1608 spin_lock_irqsave(&host
->lock
, flags
);
1610 BUG_ON(host
->bus_ops
);
1611 BUG_ON(host
->bus_refs
);
1613 host
->bus_ops
= ops
;
1617 spin_unlock_irqrestore(&host
->lock
, flags
);
1621 * Remove the current bus handler from a host.
1623 void mmc_detach_bus(struct mmc_host
*host
)
1625 unsigned long flags
;
1629 WARN_ON(!host
->claimed
);
1630 WARN_ON(!host
->bus_ops
);
1632 spin_lock_irqsave(&host
->lock
, flags
);
1636 spin_unlock_irqrestore(&host
->lock
, flags
);
1642 * mmc_detect_change - process change of state on a MMC socket
1643 * @host: host which changed state.
1644 * @delay: optional delay to wait before detection (jiffies)
1646 * MMC drivers should call this when they detect a card has been
1647 * inserted or removed. The MMC layer will confirm that any
1648 * present card is still functional, and initialize any newly
1651 void mmc_detect_change(struct mmc_host
*host
, unsigned long delay
)
1653 #ifdef CONFIG_MMC_DEBUG
1654 unsigned long flags
;
1655 spin_lock_irqsave(&host
->lock
, flags
);
1656 WARN_ON(host
->removed
);
1657 spin_unlock_irqrestore(&host
->lock
, flags
);
1659 host
->detect_change
= 1;
1660 mmc_schedule_delayed_work(&host
->detect
, delay
);
1663 EXPORT_SYMBOL(mmc_detect_change
);
1665 void mmc_init_erase(struct mmc_card
*card
)
1669 if (is_power_of_2(card
->erase_size
))
1670 card
->erase_shift
= ffs(card
->erase_size
) - 1;
1672 card
->erase_shift
= 0;
1675 * It is possible to erase an arbitrarily large area of an SD or MMC
1676 * card. That is not desirable because it can take a long time
1677 * (minutes) potentially delaying more important I/O, and also the
1678 * timeout calculations become increasingly hugely over-estimated.
1679 * Consequently, 'pref_erase' is defined as a guide to limit erases
1680 * to that size and alignment.
1682 * For SD cards that define Allocation Unit size, limit erases to one
1683 * Allocation Unit at a time. For MMC cards that define High Capacity
1684 * Erase Size, whether it is switched on or not, limit to that size.
1685 * Otherwise just have a stab at a good value. For modern cards it
1686 * will end up being 4MiB. Note that if the value is too small, it
1687 * can end up taking longer to erase.
1689 if (mmc_card_sd(card
) && card
->ssr
.au
) {
1690 card
->pref_erase
= card
->ssr
.au
;
1691 card
->erase_shift
= ffs(card
->ssr
.au
) - 1;
1692 } else if (card
->ext_csd
.hc_erase_size
) {
1693 card
->pref_erase
= card
->ext_csd
.hc_erase_size
;
1695 sz
= (card
->csd
.capacity
<< (card
->csd
.read_blkbits
- 9)) >> 11;
1697 card
->pref_erase
= 512 * 1024 / 512;
1699 card
->pref_erase
= 1024 * 1024 / 512;
1701 card
->pref_erase
= 2 * 1024 * 1024 / 512;
1703 card
->pref_erase
= 4 * 1024 * 1024 / 512;
1704 if (card
->pref_erase
< card
->erase_size
)
1705 card
->pref_erase
= card
->erase_size
;
1707 sz
= card
->pref_erase
% card
->erase_size
;
1709 card
->pref_erase
+= card
->erase_size
- sz
;
1714 static unsigned int mmc_mmc_erase_timeout(struct mmc_card
*card
,
1715 unsigned int arg
, unsigned int qty
)
1717 unsigned int erase_timeout
;
1719 if (arg
== MMC_DISCARD_ARG
||
1720 (arg
== MMC_TRIM_ARG
&& card
->ext_csd
.rev
>= 6)) {
1721 erase_timeout
= card
->ext_csd
.trim_timeout
;
1722 } else if (card
->ext_csd
.erase_group_def
& 1) {
1723 /* High Capacity Erase Group Size uses HC timeouts */
1724 if (arg
== MMC_TRIM_ARG
)
1725 erase_timeout
= card
->ext_csd
.trim_timeout
;
1727 erase_timeout
= card
->ext_csd
.hc_erase_timeout
;
1729 /* CSD Erase Group Size uses write timeout */
1730 unsigned int mult
= (10 << card
->csd
.r2w_factor
);
1731 unsigned int timeout_clks
= card
->csd
.tacc_clks
* mult
;
1732 unsigned int timeout_us
;
1734 /* Avoid overflow: e.g. tacc_ns=80000000 mult=1280 */
1735 if (card
->csd
.tacc_ns
< 1000000)
1736 timeout_us
= (card
->csd
.tacc_ns
* mult
) / 1000;
1738 timeout_us
= (card
->csd
.tacc_ns
/ 1000) * mult
;
1741 * ios.clock is only a target. The real clock rate might be
1742 * less but not that much less, so fudge it by multiplying by 2.
1745 timeout_us
+= (timeout_clks
* 1000) /
1746 (mmc_host_clk_rate(card
->host
) / 1000);
1748 erase_timeout
= timeout_us
/ 1000;
1751 * Theoretically, the calculation could underflow so round up
1752 * to 1ms in that case.
1758 /* Multiplier for secure operations */
1759 if (arg
& MMC_SECURE_ARGS
) {
1760 if (arg
== MMC_SECURE_ERASE_ARG
)
1761 erase_timeout
*= card
->ext_csd
.sec_erase_mult
;
1763 erase_timeout
*= card
->ext_csd
.sec_trim_mult
;
1766 erase_timeout
*= qty
;
1769 * Ensure at least a 1 second timeout for SPI as per
1770 * 'mmc_set_data_timeout()'
1772 if (mmc_host_is_spi(card
->host
) && erase_timeout
< 1000)
1773 erase_timeout
= 1000;
1775 return erase_timeout
;
1778 static unsigned int mmc_sd_erase_timeout(struct mmc_card
*card
,
1782 unsigned int erase_timeout
;
1784 if (card
->ssr
.erase_timeout
) {
1785 /* Erase timeout specified in SD Status Register (SSR) */
1786 erase_timeout
= card
->ssr
.erase_timeout
* qty
+
1787 card
->ssr
.erase_offset
;
1790 * Erase timeout not specified in SD Status Register (SSR) so
1791 * use 250ms per write block.
1793 erase_timeout
= 250 * qty
;
1796 /* Must not be less than 1 second */
1797 if (erase_timeout
< 1000)
1798 erase_timeout
= 1000;
1800 return erase_timeout
;
1803 static unsigned int mmc_erase_timeout(struct mmc_card
*card
,
1807 if (mmc_card_sd(card
))
1808 return mmc_sd_erase_timeout(card
, arg
, qty
);
1810 return mmc_mmc_erase_timeout(card
, arg
, qty
);
1813 static int mmc_do_erase(struct mmc_card
*card
, unsigned int from
,
1814 unsigned int to
, unsigned int arg
)
1816 struct mmc_command cmd
= {0};
1817 unsigned int qty
= 0;
1818 unsigned long timeout
;
1822 * qty is used to calculate the erase timeout which depends on how many
1823 * erase groups (or allocation units in SD terminology) are affected.
1824 * We count erasing part of an erase group as one erase group.
1825 * For SD, the allocation units are always a power of 2. For MMC, the
1826 * erase group size is almost certainly also power of 2, but it does not
1827 * seem to insist on that in the JEDEC standard, so we fall back to
1828 * division in that case. SD may not specify an allocation unit size,
1829 * in which case the timeout is based on the number of write blocks.
1831 * Note that the timeout for secure trim 2 will only be correct if the
1832 * number of erase groups specified is the same as the total of all
1833 * preceding secure trim 1 commands. Since the power may have been
1834 * lost since the secure trim 1 commands occurred, it is generally
1835 * impossible to calculate the secure trim 2 timeout correctly.
1837 if (card
->erase_shift
)
1838 qty
+= ((to
>> card
->erase_shift
) -
1839 (from
>> card
->erase_shift
)) + 1;
1840 else if (mmc_card_sd(card
))
1841 qty
+= to
- from
+ 1;
1843 qty
+= ((to
/ card
->erase_size
) -
1844 (from
/ card
->erase_size
)) + 1;
1846 if (!mmc_card_blockaddr(card
)) {
1851 if (mmc_card_sd(card
))
1852 cmd
.opcode
= SD_ERASE_WR_BLK_START
;
1854 cmd
.opcode
= MMC_ERASE_GROUP_START
;
1856 cmd
.flags
= MMC_RSP_SPI_R1
| MMC_RSP_R1
| MMC_CMD_AC
;
1857 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 0);
1859 pr_err("mmc_erase: group start error %d, "
1860 "status %#x\n", err
, cmd
.resp
[0]);
1865 memset(&cmd
, 0, sizeof(struct mmc_command
));
1866 if (mmc_card_sd(card
))
1867 cmd
.opcode
= SD_ERASE_WR_BLK_END
;
1869 cmd
.opcode
= MMC_ERASE_GROUP_END
;
1871 cmd
.flags
= MMC_RSP_SPI_R1
| MMC_RSP_R1
| MMC_CMD_AC
;
1872 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 0);
1874 pr_err("mmc_erase: group end error %d, status %#x\n",
1880 memset(&cmd
, 0, sizeof(struct mmc_command
));
1881 cmd
.opcode
= MMC_ERASE
;
1883 cmd
.flags
= MMC_RSP_SPI_R1B
| MMC_RSP_R1B
| MMC_CMD_AC
;
1884 cmd
.cmd_timeout_ms
= mmc_erase_timeout(card
, arg
, qty
);
1885 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 0);
1887 pr_err("mmc_erase: erase error %d, status %#x\n",
1893 if (mmc_host_is_spi(card
->host
))
1896 timeout
= jiffies
+ msecs_to_jiffies(MMC_CORE_TIMEOUT_MS
);
1898 memset(&cmd
, 0, sizeof(struct mmc_command
));
1899 cmd
.opcode
= MMC_SEND_STATUS
;
1900 cmd
.arg
= card
->rca
<< 16;
1901 cmd
.flags
= MMC_RSP_R1
| MMC_CMD_AC
;
1902 /* Do not retry else we can't see errors */
1903 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 0);
1904 if (err
|| (cmd
.resp
[0] & 0xFDF92000)) {
1905 pr_err("error %d requesting status %#x\n",
1911 /* Timeout if the device never becomes ready for data and
1912 * never leaves the program state.
1914 if (time_after(jiffies
, timeout
)) {
1915 pr_err("%s: Card stuck in programming state! %s\n",
1916 mmc_hostname(card
->host
), __func__
);
1921 } while (!(cmd
.resp
[0] & R1_READY_FOR_DATA
) ||
1922 (R1_CURRENT_STATE(cmd
.resp
[0]) == R1_STATE_PRG
));
1928 * mmc_erase - erase sectors.
1929 * @card: card to erase
1930 * @from: first sector to erase
1931 * @nr: number of sectors to erase
1932 * @arg: erase command argument (SD supports only %MMC_ERASE_ARG)
1934 * Caller must claim host before calling this function.
1936 int mmc_erase(struct mmc_card
*card
, unsigned int from
, unsigned int nr
,
1939 unsigned int rem
, to
= from
+ nr
;
1941 if (!(card
->host
->caps
& MMC_CAP_ERASE
) ||
1942 !(card
->csd
.cmdclass
& CCC_ERASE
))
1945 if (!card
->erase_size
)
1948 if (mmc_card_sd(card
) && arg
!= MMC_ERASE_ARG
)
1951 if ((arg
& MMC_SECURE_ARGS
) &&
1952 !(card
->ext_csd
.sec_feature_support
& EXT_CSD_SEC_ER_EN
))
1955 if ((arg
& MMC_TRIM_ARGS
) &&
1956 !(card
->ext_csd
.sec_feature_support
& EXT_CSD_SEC_GB_CL_EN
))
1959 if (arg
== MMC_SECURE_ERASE_ARG
) {
1960 if (from
% card
->erase_size
|| nr
% card
->erase_size
)
1964 if (arg
== MMC_ERASE_ARG
) {
1965 rem
= from
% card
->erase_size
;
1967 rem
= card
->erase_size
- rem
;
1974 rem
= nr
% card
->erase_size
;
1987 /* 'from' and 'to' are inclusive */
1990 return mmc_do_erase(card
, from
, to
, arg
);
1992 EXPORT_SYMBOL(mmc_erase
);
1994 int mmc_can_erase(struct mmc_card
*card
)
1996 if ((card
->host
->caps
& MMC_CAP_ERASE
) &&
1997 (card
->csd
.cmdclass
& CCC_ERASE
) && card
->erase_size
)
2001 EXPORT_SYMBOL(mmc_can_erase
);
2003 int mmc_can_trim(struct mmc_card
*card
)
2005 if (card
->ext_csd
.sec_feature_support
& EXT_CSD_SEC_GB_CL_EN
)
2009 EXPORT_SYMBOL(mmc_can_trim
);
2011 int mmc_can_discard(struct mmc_card
*card
)
2014 * As there's no way to detect the discard support bit at v4.5
2015 * use the s/w feature support filed.
2017 if (card
->ext_csd
.feature_support
& MMC_DISCARD_FEATURE
)
2021 EXPORT_SYMBOL(mmc_can_discard
);
2023 int mmc_can_sanitize(struct mmc_card
*card
)
2025 if (!mmc_can_trim(card
) && !mmc_can_erase(card
))
2027 if (card
->ext_csd
.sec_feature_support
& EXT_CSD_SEC_SANITIZE
)
2031 EXPORT_SYMBOL(mmc_can_sanitize
);
2033 int mmc_can_secure_erase_trim(struct mmc_card
*card
)
2035 if (card
->ext_csd
.sec_feature_support
& EXT_CSD_SEC_ER_EN
)
2039 EXPORT_SYMBOL(mmc_can_secure_erase_trim
);
2041 int mmc_erase_group_aligned(struct mmc_card
*card
, unsigned int from
,
2044 if (!card
->erase_size
)
2046 if (from
% card
->erase_size
|| nr
% card
->erase_size
)
2050 EXPORT_SYMBOL(mmc_erase_group_aligned
);
2052 static unsigned int mmc_do_calc_max_discard(struct mmc_card
*card
,
2055 struct mmc_host
*host
= card
->host
;
2056 unsigned int max_discard
, x
, y
, qty
= 0, max_qty
, timeout
;
2057 unsigned int last_timeout
= 0;
2059 if (card
->erase_shift
)
2060 max_qty
= UINT_MAX
>> card
->erase_shift
;
2061 else if (mmc_card_sd(card
))
2064 max_qty
= UINT_MAX
/ card
->erase_size
;
2066 /* Find the largest qty with an OK timeout */
2069 for (x
= 1; x
&& x
<= max_qty
&& max_qty
- x
>= qty
; x
<<= 1) {
2070 timeout
= mmc_erase_timeout(card
, arg
, qty
+ x
);
2071 if (timeout
> host
->max_discard_to
)
2073 if (timeout
< last_timeout
)
2075 last_timeout
= timeout
;
2087 /* Convert qty to sectors */
2088 if (card
->erase_shift
)
2089 max_discard
= --qty
<< card
->erase_shift
;
2090 else if (mmc_card_sd(card
))
2093 max_discard
= --qty
* card
->erase_size
;
2098 unsigned int mmc_calc_max_discard(struct mmc_card
*card
)
2100 struct mmc_host
*host
= card
->host
;
2101 unsigned int max_discard
, max_trim
;
2103 if (!host
->max_discard_to
)
2107 * Without erase_group_def set, MMC erase timeout depends on clock
2108 * frequence which can change. In that case, the best choice is
2109 * just the preferred erase size.
2111 if (mmc_card_mmc(card
) && !(card
->ext_csd
.erase_group_def
& 1))
2112 return card
->pref_erase
;
2114 max_discard
= mmc_do_calc_max_discard(card
, MMC_ERASE_ARG
);
2115 if (mmc_can_trim(card
)) {
2116 max_trim
= mmc_do_calc_max_discard(card
, MMC_TRIM_ARG
);
2117 if (max_trim
< max_discard
)
2118 max_discard
= max_trim
;
2119 } else if (max_discard
< card
->erase_size
) {
2122 pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n",
2123 mmc_hostname(host
), max_discard
, host
->max_discard_to
);
2126 EXPORT_SYMBOL(mmc_calc_max_discard
);
2128 int mmc_set_blocklen(struct mmc_card
*card
, unsigned int blocklen
)
2130 struct mmc_command cmd
= {0};
2132 if (mmc_card_blockaddr(card
) || mmc_card_ddr_mode(card
))
2135 cmd
.opcode
= MMC_SET_BLOCKLEN
;
2137 cmd
.flags
= MMC_RSP_SPI_R1
| MMC_RSP_R1
| MMC_CMD_AC
;
2138 return mmc_wait_for_cmd(card
->host
, &cmd
, 5);
2140 EXPORT_SYMBOL(mmc_set_blocklen
);
2142 int mmc_set_blockcount(struct mmc_card
*card
, unsigned int blockcount
,
2145 struct mmc_command cmd
= {0};
2147 cmd
.opcode
= MMC_SET_BLOCK_COUNT
;
2148 cmd
.arg
= blockcount
& 0x0000FFFF;
2151 cmd
.flags
= MMC_RSP_SPI_R1
| MMC_RSP_R1
| MMC_CMD_AC
;
2152 return mmc_wait_for_cmd(card
->host
, &cmd
, 5);
2154 EXPORT_SYMBOL(mmc_set_blockcount
);
2156 static void mmc_hw_reset_for_init(struct mmc_host
*host
)
2158 if (!(host
->caps
& MMC_CAP_HW_RESET
) || !host
->ops
->hw_reset
)
2160 mmc_host_clk_hold(host
);
2161 host
->ops
->hw_reset(host
);
2162 mmc_host_clk_release(host
);
2165 int mmc_can_reset(struct mmc_card
*card
)
2169 if (!mmc_card_mmc(card
))
2171 rst_n_function
= card
->ext_csd
.rst_n_function
;
2172 if ((rst_n_function
& EXT_CSD_RST_N_EN_MASK
) != EXT_CSD_RST_N_ENABLED
)
2176 EXPORT_SYMBOL(mmc_can_reset
);
2178 static int mmc_do_hw_reset(struct mmc_host
*host
, int check
)
2180 struct mmc_card
*card
= host
->card
;
2182 if (!host
->bus_ops
->power_restore
)
2185 if (!(host
->caps
& MMC_CAP_HW_RESET
) || !host
->ops
->hw_reset
)
2191 if (!mmc_can_reset(card
))
2194 mmc_host_clk_hold(host
);
2195 mmc_set_clock(host
, host
->f_init
);
2197 host
->ops
->hw_reset(host
);
2199 /* If the reset has happened, then a status command will fail */
2201 struct mmc_command cmd
= {0};
2204 cmd
.opcode
= MMC_SEND_STATUS
;
2205 if (!mmc_host_is_spi(card
->host
))
2206 cmd
.arg
= card
->rca
<< 16;
2207 cmd
.flags
= MMC_RSP_SPI_R2
| MMC_RSP_R1
| MMC_CMD_AC
;
2208 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 0);
2210 mmc_host_clk_release(host
);
2215 host
->card
->state
&= ~(MMC_STATE_HIGHSPEED
| MMC_STATE_HIGHSPEED_DDR
);
2216 if (mmc_host_is_spi(host
)) {
2217 host
->ios
.chip_select
= MMC_CS_HIGH
;
2218 host
->ios
.bus_mode
= MMC_BUSMODE_PUSHPULL
;
2220 host
->ios
.chip_select
= MMC_CS_DONTCARE
;
2221 host
->ios
.bus_mode
= MMC_BUSMODE_OPENDRAIN
;
2223 host
->ios
.bus_width
= MMC_BUS_WIDTH_1
;
2224 host
->ios
.timing
= MMC_TIMING_LEGACY
;
2227 mmc_host_clk_release(host
);
2229 return host
->bus_ops
->power_restore(host
);
2232 int mmc_hw_reset(struct mmc_host
*host
)
2234 return mmc_do_hw_reset(host
, 0);
2236 EXPORT_SYMBOL(mmc_hw_reset
);
2238 int mmc_hw_reset_check(struct mmc_host
*host
)
2240 return mmc_do_hw_reset(host
, 1);
2242 EXPORT_SYMBOL(mmc_hw_reset_check
);
2244 static int mmc_rescan_try_freq(struct mmc_host
*host
, unsigned freq
)
2246 host
->f_init
= freq
;
2248 #ifdef CONFIG_MMC_DEBUG
2249 pr_info("%s: %s: trying to init card at %u Hz\n",
2250 mmc_hostname(host
), __func__
, host
->f_init
);
2255 * Some eMMCs (with VCCQ always on) may not be reset after power up, so
2256 * do a hardware reset if possible.
2258 mmc_hw_reset_for_init(host
);
2261 * sdio_reset sends CMD52 to reset card. Since we do not know
2262 * if the card is being re-initialized, just send it. CMD52
2263 * should be ignored by SD/eMMC cards.
2268 mmc_send_if_cond(host
, host
->ocr_avail
);
2270 /* Order's important: probe SDIO, then SD, then MMC */
2271 if (!mmc_attach_sdio(host
))
2273 if (!mmc_attach_sd(host
))
2275 if (!mmc_attach_mmc(host
))
2278 mmc_power_off(host
);
2282 int _mmc_detect_card_removed(struct mmc_host
*host
)
2286 if ((host
->caps
& MMC_CAP_NONREMOVABLE
) || !host
->bus_ops
->alive
)
2289 if (!host
->card
|| mmc_card_removed(host
->card
))
2292 ret
= host
->bus_ops
->alive(host
);
2294 mmc_card_set_removed(host
->card
);
2295 pr_debug("%s: card remove detected\n", mmc_hostname(host
));
2301 int mmc_detect_card_removed(struct mmc_host
*host
)
2303 struct mmc_card
*card
= host
->card
;
2306 WARN_ON(!host
->claimed
);
2311 ret
= mmc_card_removed(card
);
2313 * The card will be considered unchanged unless we have been asked to
2314 * detect a change or host requires polling to provide card detection.
2316 if (!host
->detect_change
&& !(host
->caps
& MMC_CAP_NEEDS_POLL
) &&
2317 !(host
->caps2
& MMC_CAP2_DETECT_ON_ERR
))
2320 host
->detect_change
= 0;
2322 ret
= _mmc_detect_card_removed(host
);
2323 if (ret
&& (host
->caps2
& MMC_CAP2_DETECT_ON_ERR
)) {
2325 * Schedule a detect work as soon as possible to let a
2326 * rescan handle the card removal.
2328 cancel_delayed_work(&host
->detect
);
2329 mmc_detect_change(host
, 0);
2335 EXPORT_SYMBOL(mmc_detect_card_removed
);
2337 void mmc_rescan(struct work_struct
*work
)
2339 struct mmc_host
*host
=
2340 container_of(work
, struct mmc_host
, detect
.work
);
2343 if (host
->rescan_disable
)
2346 /* If there is a non-removable card registered, only scan once */
2347 if ((host
->caps
& MMC_CAP_NONREMOVABLE
) && host
->rescan_entered
)
2349 host
->rescan_entered
= 1;
2354 * if there is a _removable_ card registered, check whether it is
2357 if (host
->bus_ops
&& host
->bus_ops
->detect
&& !host
->bus_dead
2358 && !(host
->caps
& MMC_CAP_NONREMOVABLE
))
2359 host
->bus_ops
->detect(host
);
2361 host
->detect_change
= 0;
2364 * Let mmc_bus_put() free the bus/bus_ops if we've found that
2365 * the card is no longer present.
2370 /* if there still is a card present, stop here */
2371 if (host
->bus_ops
!= NULL
) {
2377 * Only we can add a new handler, so it's safe to
2378 * release the lock here.
2382 if (host
->ops
->get_cd
&& host
->ops
->get_cd(host
) == 0) {
2383 mmc_claim_host(host
);
2384 mmc_power_off(host
);
2385 mmc_release_host(host
);
2389 mmc_claim_host(host
);
2390 for (i
= 0; i
< ARRAY_SIZE(freqs
); i
++) {
2391 if (!mmc_rescan_try_freq(host
, max(freqs
[i
], host
->f_min
)))
2393 if (freqs
[i
] <= host
->f_min
)
2396 mmc_release_host(host
);
2399 if (host
->caps
& MMC_CAP_NEEDS_POLL
)
2400 mmc_schedule_delayed_work(&host
->detect
, HZ
);
2403 void mmc_start_host(struct mmc_host
*host
)
2405 host
->f_init
= max(freqs
[0], host
->f_min
);
2406 host
->rescan_disable
= 0;
2408 mmc_detect_change(host
, 0);
2411 void mmc_stop_host(struct mmc_host
*host
)
2413 #ifdef CONFIG_MMC_DEBUG
2414 unsigned long flags
;
2415 spin_lock_irqsave(&host
->lock
, flags
);
2417 spin_unlock_irqrestore(&host
->lock
, flags
);
2420 host
->rescan_disable
= 1;
2421 cancel_delayed_work_sync(&host
->detect
);
2422 mmc_flush_scheduled_work();
2424 /* clear pm flags now and let card drivers set them as needed */
2428 if (host
->bus_ops
&& !host
->bus_dead
) {
2429 /* Calling bus_ops->remove() with a claimed host can deadlock */
2430 if (host
->bus_ops
->remove
)
2431 host
->bus_ops
->remove(host
);
2433 mmc_claim_host(host
);
2434 mmc_detach_bus(host
);
2435 mmc_power_off(host
);
2436 mmc_release_host(host
);
2444 mmc_power_off(host
);
2447 int mmc_power_save_host(struct mmc_host
*host
)
2451 #ifdef CONFIG_MMC_DEBUG
2452 pr_info("%s: %s: powering down\n", mmc_hostname(host
), __func__
);
2457 if (!host
->bus_ops
|| host
->bus_dead
|| !host
->bus_ops
->power_restore
) {
2462 if (host
->bus_ops
->power_save
)
2463 ret
= host
->bus_ops
->power_save(host
);
2467 mmc_power_off(host
);
2471 EXPORT_SYMBOL(mmc_power_save_host
);
2473 int mmc_power_restore_host(struct mmc_host
*host
)
2477 #ifdef CONFIG_MMC_DEBUG
2478 pr_info("%s: %s: powering up\n", mmc_hostname(host
), __func__
);
2483 if (!host
->bus_ops
|| host
->bus_dead
|| !host
->bus_ops
->power_restore
) {
2489 ret
= host
->bus_ops
->power_restore(host
);
2495 EXPORT_SYMBOL(mmc_power_restore_host
);
2497 int mmc_card_awake(struct mmc_host
*host
)
2501 if (host
->caps2
& MMC_CAP2_NO_SLEEP_CMD
)
2506 if (host
->bus_ops
&& !host
->bus_dead
&& host
->bus_ops
->awake
)
2507 err
= host
->bus_ops
->awake(host
);
2513 EXPORT_SYMBOL(mmc_card_awake
);
2515 int mmc_card_sleep(struct mmc_host
*host
)
2519 if (host
->caps2
& MMC_CAP2_NO_SLEEP_CMD
)
2524 if (host
->bus_ops
&& !host
->bus_dead
&& host
->bus_ops
->sleep
)
2525 err
= host
->bus_ops
->sleep(host
);
2531 EXPORT_SYMBOL(mmc_card_sleep
);
2533 int mmc_card_can_sleep(struct mmc_host
*host
)
2535 struct mmc_card
*card
= host
->card
;
2537 if (card
&& mmc_card_mmc(card
) && card
->ext_csd
.rev
>= 3)
2541 EXPORT_SYMBOL(mmc_card_can_sleep
);
2544 * Flush the cache to the non-volatile storage.
2546 int mmc_flush_cache(struct mmc_card
*card
)
2548 struct mmc_host
*host
= card
->host
;
2551 if (!(host
->caps2
& MMC_CAP2_CACHE_CTRL
))
2554 if (mmc_card_mmc(card
) &&
2555 (card
->ext_csd
.cache_size
> 0) &&
2556 (card
->ext_csd
.cache_ctrl
& 1)) {
2557 err
= mmc_switch(card
, EXT_CSD_CMD_SET_NORMAL
,
2558 EXT_CSD_FLUSH_CACHE
, 1, 0);
2560 pr_err("%s: cache flush error %d\n",
2561 mmc_hostname(card
->host
), err
);
2566 EXPORT_SYMBOL(mmc_flush_cache
);
2569 * Turn the cache ON/OFF.
2570 * Turning the cache OFF shall trigger flushing of the data
2571 * to the non-volatile storage.
2572 * This function should be called with host claimed
2574 int mmc_cache_ctrl(struct mmc_host
*host
, u8 enable
)
2576 struct mmc_card
*card
= host
->card
;
2577 unsigned int timeout
;
2580 if (!(host
->caps2
& MMC_CAP2_CACHE_CTRL
) ||
2581 mmc_card_is_removable(host
))
2584 if (card
&& mmc_card_mmc(card
) &&
2585 (card
->ext_csd
.cache_size
> 0)) {
2588 if (card
->ext_csd
.cache_ctrl
^ enable
) {
2589 timeout
= enable
? card
->ext_csd
.generic_cmd6_time
: 0;
2590 err
= mmc_switch(card
, EXT_CSD_CMD_SET_NORMAL
,
2591 EXT_CSD_CACHE_CTRL
, enable
, timeout
);
2593 pr_err("%s: cache %s error %d\n",
2594 mmc_hostname(card
->host
),
2595 enable
? "on" : "off",
2598 card
->ext_csd
.cache_ctrl
= enable
;
2604 EXPORT_SYMBOL(mmc_cache_ctrl
);
2609 * mmc_suspend_host - suspend a host
2612 int mmc_suspend_host(struct mmc_host
*host
)
2616 cancel_delayed_work(&host
->detect
);
2617 mmc_flush_scheduled_work();
2620 if (host
->bus_ops
&& !host
->bus_dead
) {
2621 if (host
->bus_ops
->suspend
) {
2622 if (mmc_card_doing_bkops(host
->card
)) {
2623 err
= mmc_stop_bkops(host
->card
);
2627 err
= host
->bus_ops
->suspend(host
);
2630 if (err
== -ENOSYS
|| !host
->bus_ops
->resume
) {
2632 * We simply "remove" the card in this case.
2633 * It will be redetected on resume. (Calling
2634 * bus_ops->remove() with a claimed host can
2637 if (host
->bus_ops
->remove
)
2638 host
->bus_ops
->remove(host
);
2639 mmc_claim_host(host
);
2640 mmc_detach_bus(host
);
2641 mmc_power_off(host
);
2642 mmc_release_host(host
);
2649 if (!err
&& !mmc_card_keep_power(host
))
2650 mmc_power_off(host
);
2656 EXPORT_SYMBOL(mmc_suspend_host
);
2659 * mmc_resume_host - resume a previously suspended host
2662 int mmc_resume_host(struct mmc_host
*host
)
2667 if (host
->bus_ops
&& !host
->bus_dead
) {
2668 if (!mmc_card_keep_power(host
)) {
2670 mmc_select_voltage(host
, host
->ocr
);
2672 * Tell runtime PM core we just powered up the card,
2673 * since it still believes the card is powered off.
2674 * Note that currently runtime PM is only enabled
2675 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
2677 if (mmc_card_sdio(host
->card
) &&
2678 (host
->caps
& MMC_CAP_POWER_OFF_CARD
)) {
2679 pm_runtime_disable(&host
->card
->dev
);
2680 pm_runtime_set_active(&host
->card
->dev
);
2681 pm_runtime_enable(&host
->card
->dev
);
2684 BUG_ON(!host
->bus_ops
->resume
);
2685 err
= host
->bus_ops
->resume(host
);
2687 pr_warning("%s: error %d during resume "
2688 "(card was removed?)\n",
2689 mmc_hostname(host
), err
);
2693 host
->pm_flags
&= ~MMC_PM_KEEP_POWER
;
2698 EXPORT_SYMBOL(mmc_resume_host
);
2700 /* Do the card removal on suspend if card is assumed removeable
2701 * Do that in pm notifier while userspace isn't yet frozen, so we will be able
2704 int mmc_pm_notify(struct notifier_block
*notify_block
,
2705 unsigned long mode
, void *unused
)
2707 struct mmc_host
*host
= container_of(
2708 notify_block
, struct mmc_host
, pm_notify
);
2709 unsigned long flags
;
2713 case PM_HIBERNATION_PREPARE
:
2714 case PM_SUSPEND_PREPARE
:
2715 if (host
->card
&& mmc_card_mmc(host
->card
) &&
2716 mmc_card_doing_bkops(host
->card
)) {
2717 err
= mmc_stop_bkops(host
->card
);
2719 pr_err("%s: didn't stop bkops\n",
2720 mmc_hostname(host
));
2723 mmc_card_clr_doing_bkops(host
->card
);
2726 spin_lock_irqsave(&host
->lock
, flags
);
2727 host
->rescan_disable
= 1;
2728 spin_unlock_irqrestore(&host
->lock
, flags
);
2729 cancel_delayed_work_sync(&host
->detect
);
2731 if (!host
->bus_ops
|| host
->bus_ops
->suspend
)
2734 /* Calling bus_ops->remove() with a claimed host can deadlock */
2735 if (host
->bus_ops
->remove
)
2736 host
->bus_ops
->remove(host
);
2738 mmc_claim_host(host
);
2739 mmc_detach_bus(host
);
2740 mmc_power_off(host
);
2741 mmc_release_host(host
);
2745 case PM_POST_SUSPEND
:
2746 case PM_POST_HIBERNATION
:
2747 case PM_POST_RESTORE
:
2749 spin_lock_irqsave(&host
->lock
, flags
);
2750 host
->rescan_disable
= 0;
2751 spin_unlock_irqrestore(&host
->lock
, flags
);
2752 mmc_detect_change(host
, 0);
2761 * mmc_init_context_info() - init synchronization context
2764 * Init struct context_info needed to implement asynchronous
2765 * request mechanism, used by mmc core, host driver and mmc requests
2768 void mmc_init_context_info(struct mmc_host
*host
)
2770 spin_lock_init(&host
->context_info
.lock
);
2771 host
->context_info
.is_new_req
= false;
2772 host
->context_info
.is_done_rcv
= false;
2773 host
->context_info
.is_waiting_last_req
= false;
2774 init_waitqueue_head(&host
->context_info
.wait
);
2777 static int __init
mmc_init(void)
2781 workqueue
= alloc_ordered_workqueue("kmmcd", 0);
2785 ret
= mmc_register_bus();
2787 goto destroy_workqueue
;
2789 ret
= mmc_register_host_class();
2791 goto unregister_bus
;
2793 ret
= sdio_register_bus();
2795 goto unregister_host_class
;
2799 unregister_host_class
:
2800 mmc_unregister_host_class();
2802 mmc_unregister_bus();
2804 destroy_workqueue(workqueue
);
2809 static void __exit
mmc_exit(void)
2811 sdio_unregister_bus();
2812 mmc_unregister_host_class();
2813 mmc_unregister_bus();
2814 destroy_workqueue(workqueue
);
2817 subsys_initcall(mmc_init
);
2818 module_exit(mmc_exit
);
2820 MODULE_LICENSE("GPL");