2 * linux/drivers/mmc/core/core.c
4 * Copyright (C) 2003-2004 Russell King, All Rights Reserved.
5 * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
6 * Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved.
7 * MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/interrupt.h>
16 #include <linux/completion.h>
17 #include <linux/device.h>
18 #include <linux/delay.h>
19 #include <linux/pagemap.h>
20 #include <linux/err.h>
21 #include <linux/leds.h>
22 #include <linux/scatterlist.h>
23 #include <linux/log2.h>
24 #include <linux/regulator/consumer.h>
25 #include <linux/pm_runtime.h>
26 #include <linux/pm_wakeup.h>
27 #include <linux/suspend.h>
28 #include <linux/fault-inject.h>
29 #include <linux/random.h>
30 #include <linux/slab.h>
33 #include <linux/mmc/card.h>
34 #include <linux/mmc/host.h>
35 #include <linux/mmc/mmc.h>
36 #include <linux/mmc/sd.h>
37 #include <linux/mmc/slot-gpio.h>
49 /* If the device is not responding */
50 #define MMC_CORE_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute timeout */
53 * Background operations can take a long time, depending on the housekeeping
54 * operations the card has to perform.
56 #define MMC_BKOPS_MAX_TIMEOUT (4 * 60 * 1000) /* max time to wait in ms */
58 static struct workqueue_struct
*workqueue
;
59 static const unsigned freqs
[] = { 400000, 300000, 200000, 100000 };
62 * Enabling software CRCs on the data blocks can be a significant (30%)
63 * performance cost, and for other reasons may not always be desired.
64 * So we allow it it to be disabled.
67 module_param(use_spi_crc
, bool, 0);
70 * Internal function. Schedule delayed work in the MMC work queue.
72 static int mmc_schedule_delayed_work(struct delayed_work
*work
,
75 return queue_delayed_work(workqueue
, work
, delay
);
79 * Internal function. Flush all scheduled work from the MMC work queue.
81 static void mmc_flush_scheduled_work(void)
83 flush_workqueue(workqueue
);
86 #ifdef CONFIG_FAIL_MMC_REQUEST
89 * Internal function. Inject random data errors.
90 * If mmc_data is NULL no errors are injected.
92 static void mmc_should_fail_request(struct mmc_host
*host
,
93 struct mmc_request
*mrq
)
95 struct mmc_command
*cmd
= mrq
->cmd
;
96 struct mmc_data
*data
= mrq
->data
;
97 static const int data_errors
[] = {
106 if (cmd
->error
|| data
->error
||
107 !should_fail(&host
->fail_mmc_request
, data
->blksz
* data
->blocks
))
110 data
->error
= data_errors
[prandom_u32() % ARRAY_SIZE(data_errors
)];
111 data
->bytes_xfered
= (prandom_u32() % (data
->bytes_xfered
>> 9)) << 9;
114 #else /* CONFIG_FAIL_MMC_REQUEST */
116 static inline void mmc_should_fail_request(struct mmc_host
*host
,
117 struct mmc_request
*mrq
)
121 #endif /* CONFIG_FAIL_MMC_REQUEST */
124 * mmc_request_done - finish processing an MMC request
125 * @host: MMC host which completed request
126 * @mrq: MMC request which request
128 * MMC drivers should call this function when they have completed
129 * their processing of a request.
131 void mmc_request_done(struct mmc_host
*host
, struct mmc_request
*mrq
)
133 struct mmc_command
*cmd
= mrq
->cmd
;
134 int err
= cmd
->error
;
136 /* Flag re-tuning needed on CRC errors */
137 if ((cmd
->opcode
!= MMC_SEND_TUNING_BLOCK
&&
138 cmd
->opcode
!= MMC_SEND_TUNING_BLOCK_HS200
) &&
139 (err
== -EILSEQ
|| (mrq
->sbc
&& mrq
->sbc
->error
== -EILSEQ
) ||
140 (mrq
->data
&& mrq
->data
->error
== -EILSEQ
) ||
141 (mrq
->stop
&& mrq
->stop
->error
== -EILSEQ
)))
142 mmc_retune_needed(host
);
144 if (err
&& cmd
->retries
&& mmc_host_is_spi(host
)) {
145 if (cmd
->resp
[0] & R1_SPI_ILLEGAL_COMMAND
)
149 if (err
&& cmd
->retries
&& !mmc_card_removed(host
->card
)) {
151 * Request starter must handle retries - see
152 * mmc_wait_for_req_done().
157 mmc_should_fail_request(host
, mrq
);
159 led_trigger_event(host
->led
, LED_OFF
);
162 pr_debug("%s: req done <CMD%u>: %d: %08x %08x %08x %08x\n",
163 mmc_hostname(host
), mrq
->sbc
->opcode
,
165 mrq
->sbc
->resp
[0], mrq
->sbc
->resp
[1],
166 mrq
->sbc
->resp
[2], mrq
->sbc
->resp
[3]);
169 pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n",
170 mmc_hostname(host
), cmd
->opcode
, err
,
171 cmd
->resp
[0], cmd
->resp
[1],
172 cmd
->resp
[2], cmd
->resp
[3]);
175 pr_debug("%s: %d bytes transferred: %d\n",
177 mrq
->data
->bytes_xfered
, mrq
->data
->error
);
181 pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n",
182 mmc_hostname(host
), mrq
->stop
->opcode
,
184 mrq
->stop
->resp
[0], mrq
->stop
->resp
[1],
185 mrq
->stop
->resp
[2], mrq
->stop
->resp
[3]);
191 mmc_host_clk_release(host
);
195 EXPORT_SYMBOL(mmc_request_done
);
197 static void __mmc_start_request(struct mmc_host
*host
, struct mmc_request
*mrq
)
201 /* Assumes host controller has been runtime resumed by mmc_claim_host */
202 err
= mmc_retune(host
);
204 mrq
->cmd
->error
= err
;
205 mmc_request_done(host
, mrq
);
209 host
->ops
->request(host
, mrq
);
212 static int mmc_start_request(struct mmc_host
*host
, struct mmc_request
*mrq
)
214 #ifdef CONFIG_MMC_DEBUG
216 struct scatterlist
*sg
;
218 mmc_retune_hold(host
);
220 if (mmc_card_removed(host
->card
))
224 pr_debug("<%s: starting CMD%u arg %08x flags %08x>\n",
225 mmc_hostname(host
), mrq
->sbc
->opcode
,
226 mrq
->sbc
->arg
, mrq
->sbc
->flags
);
229 pr_debug("%s: starting CMD%u arg %08x flags %08x\n",
230 mmc_hostname(host
), mrq
->cmd
->opcode
,
231 mrq
->cmd
->arg
, mrq
->cmd
->flags
);
234 pr_debug("%s: blksz %d blocks %d flags %08x "
235 "tsac %d ms nsac %d\n",
236 mmc_hostname(host
), mrq
->data
->blksz
,
237 mrq
->data
->blocks
, mrq
->data
->flags
,
238 mrq
->data
->timeout_ns
/ 1000000,
239 mrq
->data
->timeout_clks
);
243 pr_debug("%s: CMD%u arg %08x flags %08x\n",
244 mmc_hostname(host
), mrq
->stop
->opcode
,
245 mrq
->stop
->arg
, mrq
->stop
->flags
);
248 WARN_ON(!host
->claimed
);
257 BUG_ON(mrq
->data
->blksz
> host
->max_blk_size
);
258 BUG_ON(mrq
->data
->blocks
> host
->max_blk_count
);
259 BUG_ON(mrq
->data
->blocks
* mrq
->data
->blksz
>
262 #ifdef CONFIG_MMC_DEBUG
264 for_each_sg(mrq
->data
->sg
, sg
, mrq
->data
->sg_len
, i
)
266 BUG_ON(sz
!= mrq
->data
->blocks
* mrq
->data
->blksz
);
269 mrq
->cmd
->data
= mrq
->data
;
270 mrq
->data
->error
= 0;
271 mrq
->data
->mrq
= mrq
;
273 mrq
->data
->stop
= mrq
->stop
;
274 mrq
->stop
->error
= 0;
275 mrq
->stop
->mrq
= mrq
;
278 mmc_host_clk_hold(host
);
279 led_trigger_event(host
->led
, LED_FULL
);
280 __mmc_start_request(host
, mrq
);
286 * mmc_start_bkops - start BKOPS for supported cards
287 * @card: MMC card to start BKOPS
288 * @form_exception: A flag to indicate if this function was
289 * called due to an exception raised by the card
291 * Start background operations whenever requested.
292 * When the urgent BKOPS bit is set in a R1 command response
293 * then background operations should be started immediately.
295 void mmc_start_bkops(struct mmc_card
*card
, bool from_exception
)
299 bool use_busy_signal
;
303 if (!card
->ext_csd
.man_bkops_en
|| mmc_card_doing_bkops(card
))
306 err
= mmc_read_bkops_status(card
);
308 pr_err("%s: Failed to read bkops status: %d\n",
309 mmc_hostname(card
->host
), err
);
313 if (!card
->ext_csd
.raw_bkops_status
)
316 if (card
->ext_csd
.raw_bkops_status
< EXT_CSD_BKOPS_LEVEL_2
&&
320 mmc_claim_host(card
->host
);
321 if (card
->ext_csd
.raw_bkops_status
>= EXT_CSD_BKOPS_LEVEL_2
) {
322 timeout
= MMC_BKOPS_MAX_TIMEOUT
;
323 use_busy_signal
= true;
326 use_busy_signal
= false;
329 mmc_retune_hold(card
->host
);
331 err
= __mmc_switch(card
, EXT_CSD_CMD_SET_NORMAL
,
332 EXT_CSD_BKOPS_START
, 1, timeout
,
333 use_busy_signal
, true, false);
335 pr_warn("%s: Error %d starting bkops\n",
336 mmc_hostname(card
->host
), err
);
337 mmc_retune_release(card
->host
);
342 * For urgent bkops status (LEVEL_2 and more)
343 * bkops executed synchronously, otherwise
344 * the operation is in progress
346 if (!use_busy_signal
)
347 mmc_card_set_doing_bkops(card
);
349 mmc_retune_release(card
->host
);
351 mmc_release_host(card
->host
);
353 EXPORT_SYMBOL(mmc_start_bkops
);
356 * mmc_wait_data_done() - done callback for data request
357 * @mrq: done data request
359 * Wakes up mmc context, passed as a callback to host controller driver
361 static void mmc_wait_data_done(struct mmc_request
*mrq
)
363 struct mmc_context_info
*context_info
= &mrq
->host
->context_info
;
365 context_info
->is_done_rcv
= true;
366 wake_up_interruptible(&context_info
->wait
);
369 static void mmc_wait_done(struct mmc_request
*mrq
)
371 complete(&mrq
->completion
);
375 *__mmc_start_data_req() - starts data request
376 * @host: MMC host to start the request
377 * @mrq: data request to start
379 * Sets the done callback to be called when request is completed by the card.
380 * Starts data mmc request execution
382 static int __mmc_start_data_req(struct mmc_host
*host
, struct mmc_request
*mrq
)
386 mrq
->done
= mmc_wait_data_done
;
389 err
= mmc_start_request(host
, mrq
);
391 mrq
->cmd
->error
= err
;
392 mmc_wait_data_done(mrq
);
398 static int __mmc_start_req(struct mmc_host
*host
, struct mmc_request
*mrq
)
402 init_completion(&mrq
->completion
);
403 mrq
->done
= mmc_wait_done
;
405 err
= mmc_start_request(host
, mrq
);
407 mrq
->cmd
->error
= err
;
408 complete(&mrq
->completion
);
415 * mmc_wait_for_data_req_done() - wait for request completed
416 * @host: MMC host to prepare the command.
417 * @mrq: MMC request to wait for
419 * Blocks MMC context till host controller will ack end of data request
420 * execution or new request notification arrives from the block layer.
421 * Handles command retries.
423 * Returns enum mmc_blk_status after checking errors.
425 static int mmc_wait_for_data_req_done(struct mmc_host
*host
,
426 struct mmc_request
*mrq
,
427 struct mmc_async_req
*next_req
)
429 struct mmc_command
*cmd
;
430 struct mmc_context_info
*context_info
= &host
->context_info
;
435 wait_event_interruptible(context_info
->wait
,
436 (context_info
->is_done_rcv
||
437 context_info
->is_new_req
));
438 spin_lock_irqsave(&context_info
->lock
, flags
);
439 context_info
->is_waiting_last_req
= false;
440 spin_unlock_irqrestore(&context_info
->lock
, flags
);
441 if (context_info
->is_done_rcv
) {
442 context_info
->is_done_rcv
= false;
443 context_info
->is_new_req
= false;
446 if (!cmd
->error
|| !cmd
->retries
||
447 mmc_card_removed(host
->card
)) {
448 err
= host
->areq
->err_check(host
->card
,
450 break; /* return err */
452 mmc_retune_recheck(host
);
453 pr_info("%s: req failed (CMD%u): %d, retrying...\n",
455 cmd
->opcode
, cmd
->error
);
458 __mmc_start_request(host
, mrq
);
459 continue; /* wait for done/new event again */
461 } else if (context_info
->is_new_req
) {
462 context_info
->is_new_req
= false;
464 return MMC_BLK_NEW_REQUEST
;
467 mmc_retune_release(host
);
471 static void mmc_wait_for_req_done(struct mmc_host
*host
,
472 struct mmc_request
*mrq
)
474 struct mmc_command
*cmd
;
477 wait_for_completion(&mrq
->completion
);
482 * If host has timed out waiting for the sanitize
483 * to complete, card might be still in programming state
484 * so let's try to bring the card out of programming
487 if (cmd
->sanitize_busy
&& cmd
->error
== -ETIMEDOUT
) {
488 if (!mmc_interrupt_hpi(host
->card
)) {
489 pr_warn("%s: %s: Interrupted sanitize\n",
490 mmc_hostname(host
), __func__
);
494 pr_err("%s: %s: Failed to interrupt sanitize\n",
495 mmc_hostname(host
), __func__
);
498 if (!cmd
->error
|| !cmd
->retries
||
499 mmc_card_removed(host
->card
))
502 mmc_retune_recheck(host
);
504 pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
505 mmc_hostname(host
), cmd
->opcode
, cmd
->error
);
508 __mmc_start_request(host
, mrq
);
511 mmc_retune_release(host
);
515 * mmc_pre_req - Prepare for a new request
516 * @host: MMC host to prepare command
517 * @mrq: MMC request to prepare for
518 * @is_first_req: true if there is no previous started request
519 * that may run in parellel to this call, otherwise false
521 * mmc_pre_req() is called in prior to mmc_start_req() to let
522 * host prepare for the new request. Preparation of a request may be
523 * performed while another request is running on the host.
525 static void mmc_pre_req(struct mmc_host
*host
, struct mmc_request
*mrq
,
528 if (host
->ops
->pre_req
) {
529 mmc_host_clk_hold(host
);
530 host
->ops
->pre_req(host
, mrq
, is_first_req
);
531 mmc_host_clk_release(host
);
536 * mmc_post_req - Post process a completed request
537 * @host: MMC host to post process command
538 * @mrq: MMC request to post process for
539 * @err: Error, if non zero, clean up any resources made in pre_req
541 * Let the host post process a completed request. Post processing of
542 * a request may be performed while another reuqest is running.
544 static void mmc_post_req(struct mmc_host
*host
, struct mmc_request
*mrq
,
547 if (host
->ops
->post_req
) {
548 mmc_host_clk_hold(host
);
549 host
->ops
->post_req(host
, mrq
, err
);
550 mmc_host_clk_release(host
);
555 * mmc_start_req - start a non-blocking request
556 * @host: MMC host to start command
557 * @areq: async request to start
558 * @error: out parameter returns 0 for success, otherwise non zero
560 * Start a new MMC custom command request for a host.
561 * If there is on ongoing async request wait for completion
562 * of that request and start the new one and return.
563 * Does not wait for the new request to complete.
565 * Returns the completed request, NULL in case of none completed.
566 * Wait for the an ongoing request (previoulsy started) to complete and
567 * return the completed request. If there is no ongoing request, NULL
568 * is returned without waiting. NULL is not an error condition.
570 struct mmc_async_req
*mmc_start_req(struct mmc_host
*host
,
571 struct mmc_async_req
*areq
, int *error
)
575 struct mmc_async_req
*data
= host
->areq
;
577 /* Prepare a new request */
579 mmc_pre_req(host
, areq
->mrq
, !host
->areq
);
582 err
= mmc_wait_for_data_req_done(host
, host
->areq
->mrq
, areq
);
583 if (err
== MMC_BLK_NEW_REQUEST
) {
587 * The previous request was not completed,
593 * Check BKOPS urgency for each R1 response
595 if (host
->card
&& mmc_card_mmc(host
->card
) &&
596 ((mmc_resp_type(host
->areq
->mrq
->cmd
) == MMC_RSP_R1
) ||
597 (mmc_resp_type(host
->areq
->mrq
->cmd
) == MMC_RSP_R1B
)) &&
598 (host
->areq
->mrq
->cmd
->resp
[0] & R1_EXCEPTION_EVENT
)) {
600 /* Cancel the prepared request */
602 mmc_post_req(host
, areq
->mrq
, -EINVAL
);
604 mmc_start_bkops(host
->card
, true);
606 /* prepare the request again */
608 mmc_pre_req(host
, areq
->mrq
, !host
->areq
);
613 start_err
= __mmc_start_data_req(host
, areq
->mrq
);
616 mmc_post_req(host
, host
->areq
->mrq
, 0);
618 /* Cancel a prepared request if it was not started. */
619 if ((err
|| start_err
) && areq
)
620 mmc_post_req(host
, areq
->mrq
, -EINVAL
);
631 EXPORT_SYMBOL(mmc_start_req
);
634 * mmc_wait_for_req - start a request and wait for completion
635 * @host: MMC host to start command
636 * @mrq: MMC request to start
638 * Start a new MMC custom command request for a host, and wait
639 * for the command to complete. Does not attempt to parse the
642 void mmc_wait_for_req(struct mmc_host
*host
, struct mmc_request
*mrq
)
644 __mmc_start_req(host
, mrq
);
645 mmc_wait_for_req_done(host
, mrq
);
647 EXPORT_SYMBOL(mmc_wait_for_req
);
650 * mmc_interrupt_hpi - Issue for High priority Interrupt
651 * @card: the MMC card associated with the HPI transfer
653 * Issued High Priority Interrupt, and check for card status
654 * until out-of prg-state.
656 int mmc_interrupt_hpi(struct mmc_card
*card
)
660 unsigned long prg_wait
;
664 if (!card
->ext_csd
.hpi_en
) {
665 pr_info("%s: HPI enable bit unset\n", mmc_hostname(card
->host
));
669 mmc_claim_host(card
->host
);
670 err
= mmc_send_status(card
, &status
);
672 pr_err("%s: Get card status fail\n", mmc_hostname(card
->host
));
676 switch (R1_CURRENT_STATE(status
)) {
682 * In idle and transfer states, HPI is not needed and the caller
683 * can issue the next intended command immediately
689 /* In all other states, it's illegal to issue HPI */
690 pr_debug("%s: HPI cannot be sent. Card state=%d\n",
691 mmc_hostname(card
->host
), R1_CURRENT_STATE(status
));
696 err
= mmc_send_hpi_cmd(card
, &status
);
700 prg_wait
= jiffies
+ msecs_to_jiffies(card
->ext_csd
.out_of_int_time
);
702 err
= mmc_send_status(card
, &status
);
704 if (!err
&& R1_CURRENT_STATE(status
) == R1_STATE_TRAN
)
706 if (time_after(jiffies
, prg_wait
))
711 mmc_release_host(card
->host
);
714 EXPORT_SYMBOL(mmc_interrupt_hpi
);
717 * mmc_wait_for_cmd - start a command and wait for completion
718 * @host: MMC host to start command
719 * @cmd: MMC command to start
720 * @retries: maximum number of retries
722 * Start a new MMC command for a host, and wait for the command
723 * to complete. Return any error that occurred while the command
724 * was executing. Do not attempt to parse the response.
726 int mmc_wait_for_cmd(struct mmc_host
*host
, struct mmc_command
*cmd
, int retries
)
728 struct mmc_request mrq
= {NULL
};
730 WARN_ON(!host
->claimed
);
732 memset(cmd
->resp
, 0, sizeof(cmd
->resp
));
733 cmd
->retries
= retries
;
738 mmc_wait_for_req(host
, &mrq
);
743 EXPORT_SYMBOL(mmc_wait_for_cmd
);
746 * mmc_stop_bkops - stop ongoing BKOPS
747 * @card: MMC card to check BKOPS
749 * Send HPI command to stop ongoing background operations to
750 * allow rapid servicing of foreground operations, e.g. read/
751 * writes. Wait until the card comes out of the programming state
752 * to avoid errors in servicing read/write requests.
754 int mmc_stop_bkops(struct mmc_card
*card
)
759 err
= mmc_interrupt_hpi(card
);
762 * If err is EINVAL, we can't issue an HPI.
763 * It should complete the BKOPS.
765 if (!err
|| (err
== -EINVAL
)) {
766 mmc_card_clr_doing_bkops(card
);
767 mmc_retune_release(card
->host
);
773 EXPORT_SYMBOL(mmc_stop_bkops
);
775 int mmc_read_bkops_status(struct mmc_card
*card
)
780 mmc_claim_host(card
->host
);
781 err
= mmc_get_ext_csd(card
, &ext_csd
);
782 mmc_release_host(card
->host
);
786 card
->ext_csd
.raw_bkops_status
= ext_csd
[EXT_CSD_BKOPS_STATUS
];
787 card
->ext_csd
.raw_exception_status
= ext_csd
[EXT_CSD_EXP_EVENTS_STATUS
];
791 EXPORT_SYMBOL(mmc_read_bkops_status
);
794 * mmc_set_data_timeout - set the timeout for a data command
795 * @data: data phase for command
796 * @card: the MMC card associated with the data transfer
798 * Computes the data timeout parameters according to the
799 * correct algorithm given the card type.
801 void mmc_set_data_timeout(struct mmc_data
*data
, const struct mmc_card
*card
)
806 * SDIO cards only define an upper 1 s limit on access.
808 if (mmc_card_sdio(card
)) {
809 data
->timeout_ns
= 1000000000;
810 data
->timeout_clks
= 0;
815 * SD cards use a 100 multiplier rather than 10
817 mult
= mmc_card_sd(card
) ? 100 : 10;
820 * Scale up the multiplier (and therefore the timeout) by
821 * the r2w factor for writes.
823 if (data
->flags
& MMC_DATA_WRITE
)
824 mult
<<= card
->csd
.r2w_factor
;
826 data
->timeout_ns
= card
->csd
.tacc_ns
* mult
;
827 data
->timeout_clks
= card
->csd
.tacc_clks
* mult
;
830 * SD cards also have an upper limit on the timeout.
832 if (mmc_card_sd(card
)) {
833 unsigned int timeout_us
, limit_us
;
835 timeout_us
= data
->timeout_ns
/ 1000;
836 if (mmc_host_clk_rate(card
->host
))
837 timeout_us
+= data
->timeout_clks
* 1000 /
838 (mmc_host_clk_rate(card
->host
) / 1000);
840 if (data
->flags
& MMC_DATA_WRITE
)
842 * The MMC spec "It is strongly recommended
843 * for hosts to implement more than 500ms
844 * timeout value even if the card indicates
845 * the 250ms maximum busy length." Even the
846 * previous value of 300ms is known to be
847 * insufficient for some cards.
854 * SDHC cards always use these fixed values.
856 if (timeout_us
> limit_us
|| mmc_card_blockaddr(card
)) {
857 data
->timeout_ns
= limit_us
* 1000;
858 data
->timeout_clks
= 0;
861 /* assign limit value if invalid */
863 data
->timeout_ns
= limit_us
* 1000;
867 * Some cards require longer data read timeout than indicated in CSD.
868 * Address this by setting the read timeout to a "reasonably high"
869 * value. For the cards tested, 300ms has proven enough. If necessary,
870 * this value can be increased if other problematic cards require this.
872 if (mmc_card_long_read_time(card
) && data
->flags
& MMC_DATA_READ
) {
873 data
->timeout_ns
= 300000000;
874 data
->timeout_clks
= 0;
878 * Some cards need very high timeouts if driven in SPI mode.
879 * The worst observed timeout was 900ms after writing a
880 * continuous stream of data until the internal logic
883 if (mmc_host_is_spi(card
->host
)) {
884 if (data
->flags
& MMC_DATA_WRITE
) {
885 if (data
->timeout_ns
< 1000000000)
886 data
->timeout_ns
= 1000000000; /* 1s */
888 if (data
->timeout_ns
< 100000000)
889 data
->timeout_ns
= 100000000; /* 100ms */
893 EXPORT_SYMBOL(mmc_set_data_timeout
);
896 * mmc_align_data_size - pads a transfer size to a more optimal value
897 * @card: the MMC card associated with the data transfer
898 * @sz: original transfer size
900 * Pads the original data size with a number of extra bytes in
901 * order to avoid controller bugs and/or performance hits
902 * (e.g. some controllers revert to PIO for certain sizes).
904 * Returns the improved size, which might be unmodified.
906 * Note that this function is only relevant when issuing a
907 * single scatter gather entry.
909 unsigned int mmc_align_data_size(struct mmc_card
*card
, unsigned int sz
)
912 * FIXME: We don't have a system for the controller to tell
913 * the core about its problems yet, so for now we just 32-bit
916 sz
= ((sz
+ 3) / 4) * 4;
920 EXPORT_SYMBOL(mmc_align_data_size
);
923 * __mmc_claim_host - exclusively claim a host
924 * @host: mmc host to claim
925 * @abort: whether or not the operation should be aborted
927 * Claim a host for a set of operations. If @abort is non null and
928 * dereference a non-zero value then this will return prematurely with
929 * that non-zero value without acquiring the lock. Returns zero
930 * with the lock held otherwise.
932 int __mmc_claim_host(struct mmc_host
*host
, atomic_t
*abort
)
934 DECLARE_WAITQUEUE(wait
, current
);
941 add_wait_queue(&host
->wq
, &wait
);
942 spin_lock_irqsave(&host
->lock
, flags
);
944 set_current_state(TASK_UNINTERRUPTIBLE
);
945 stop
= abort
? atomic_read(abort
) : 0;
946 if (stop
|| !host
->claimed
|| host
->claimer
== current
)
948 spin_unlock_irqrestore(&host
->lock
, flags
);
950 spin_lock_irqsave(&host
->lock
, flags
);
952 set_current_state(TASK_RUNNING
);
955 host
->claimer
= current
;
956 host
->claim_cnt
+= 1;
957 if (host
->claim_cnt
== 1)
961 spin_unlock_irqrestore(&host
->lock
, flags
);
962 remove_wait_queue(&host
->wq
, &wait
);
965 pm_runtime_get_sync(mmc_dev(host
));
969 EXPORT_SYMBOL(__mmc_claim_host
);
972 * mmc_release_host - release a host
973 * @host: mmc host to release
975 * Release a MMC host, allowing others to claim the host
976 * for their operations.
978 void mmc_release_host(struct mmc_host
*host
)
982 WARN_ON(!host
->claimed
);
984 spin_lock_irqsave(&host
->lock
, flags
);
985 if (--host
->claim_cnt
) {
986 /* Release for nested claim */
987 spin_unlock_irqrestore(&host
->lock
, flags
);
990 host
->claimer
= NULL
;
991 spin_unlock_irqrestore(&host
->lock
, flags
);
993 pm_runtime_mark_last_busy(mmc_dev(host
));
994 pm_runtime_put_autosuspend(mmc_dev(host
));
997 EXPORT_SYMBOL(mmc_release_host
);
1000 * This is a helper function, which fetches a runtime pm reference for the
1001 * card device and also claims the host.
1003 void mmc_get_card(struct mmc_card
*card
)
1005 pm_runtime_get_sync(&card
->dev
);
1006 mmc_claim_host(card
->host
);
1008 EXPORT_SYMBOL(mmc_get_card
);
1011 * This is a helper function, which releases the host and drops the runtime
1012 * pm reference for the card device.
1014 void mmc_put_card(struct mmc_card
*card
)
1016 mmc_release_host(card
->host
);
1017 pm_runtime_mark_last_busy(&card
->dev
);
1018 pm_runtime_put_autosuspend(&card
->dev
);
1020 EXPORT_SYMBOL(mmc_put_card
);
1023 * Internal function that does the actual ios call to the host driver,
1024 * optionally printing some debug output.
1026 static inline void mmc_set_ios(struct mmc_host
*host
)
1028 struct mmc_ios
*ios
= &host
->ios
;
1030 pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u "
1031 "width %u timing %u\n",
1032 mmc_hostname(host
), ios
->clock
, ios
->bus_mode
,
1033 ios
->power_mode
, ios
->chip_select
, ios
->vdd
,
1034 ios
->bus_width
, ios
->timing
);
1037 mmc_set_ungated(host
);
1038 host
->ops
->set_ios(host
, ios
);
1042 * Control chip select pin on a host.
1044 void mmc_set_chip_select(struct mmc_host
*host
, int mode
)
1046 mmc_host_clk_hold(host
);
1047 host
->ios
.chip_select
= mode
;
1049 mmc_host_clk_release(host
);
1053 * Sets the host clock to the highest possible frequency that
1056 static void __mmc_set_clock(struct mmc_host
*host
, unsigned int hz
)
1058 WARN_ON(hz
&& hz
< host
->f_min
);
1060 if (hz
> host
->f_max
)
1063 host
->ios
.clock
= hz
;
1067 void mmc_set_clock(struct mmc_host
*host
, unsigned int hz
)
1069 mmc_host_clk_hold(host
);
1070 __mmc_set_clock(host
, hz
);
1071 mmc_host_clk_release(host
);
1074 #ifdef CONFIG_MMC_CLKGATE
1076 * This gates the clock by setting it to 0 Hz.
1078 void mmc_gate_clock(struct mmc_host
*host
)
1080 unsigned long flags
;
1082 spin_lock_irqsave(&host
->clk_lock
, flags
);
1083 host
->clk_old
= host
->ios
.clock
;
1084 host
->ios
.clock
= 0;
1085 host
->clk_gated
= true;
1086 spin_unlock_irqrestore(&host
->clk_lock
, flags
);
1091 * This restores the clock from gating by using the cached
1094 void mmc_ungate_clock(struct mmc_host
*host
)
1097 * We should previously have gated the clock, so the clock shall
1098 * be 0 here! The clock may however be 0 during initialization,
1099 * when some request operations are performed before setting
1100 * the frequency. When ungate is requested in that situation
1101 * we just ignore the call.
1103 if (host
->clk_old
) {
1104 BUG_ON(host
->ios
.clock
);
1105 /* This call will also set host->clk_gated to false */
1106 __mmc_set_clock(host
, host
->clk_old
);
1110 void mmc_set_ungated(struct mmc_host
*host
)
1112 unsigned long flags
;
1115 * We've been given a new frequency while the clock is gated,
1116 * so make sure we regard this as ungating it.
1118 spin_lock_irqsave(&host
->clk_lock
, flags
);
1119 host
->clk_gated
= false;
1120 spin_unlock_irqrestore(&host
->clk_lock
, flags
);
1124 void mmc_set_ungated(struct mmc_host
*host
)
1129 int mmc_execute_tuning(struct mmc_card
*card
)
1131 struct mmc_host
*host
= card
->host
;
1135 if (!host
->ops
->execute_tuning
)
1138 if (mmc_card_mmc(card
))
1139 opcode
= MMC_SEND_TUNING_BLOCK_HS200
;
1141 opcode
= MMC_SEND_TUNING_BLOCK
;
1143 mmc_host_clk_hold(host
);
1144 err
= host
->ops
->execute_tuning(host
, opcode
);
1145 mmc_host_clk_release(host
);
1148 pr_err("%s: tuning execution failed\n", mmc_hostname(host
));
1150 mmc_retune_enable(host
);
1156 * Change the bus mode (open drain/push-pull) of a host.
1158 void mmc_set_bus_mode(struct mmc_host
*host
, unsigned int mode
)
1160 mmc_host_clk_hold(host
);
1161 host
->ios
.bus_mode
= mode
;
1163 mmc_host_clk_release(host
);
1167 * Change data bus width of a host.
1169 void mmc_set_bus_width(struct mmc_host
*host
, unsigned int width
)
1171 mmc_host_clk_hold(host
);
1172 host
->ios
.bus_width
= width
;
1174 mmc_host_clk_release(host
);
1178 * Set initial state after a power cycle or a hw_reset.
1180 void mmc_set_initial_state(struct mmc_host
*host
)
1182 mmc_retune_disable(host
);
1184 if (mmc_host_is_spi(host
))
1185 host
->ios
.chip_select
= MMC_CS_HIGH
;
1187 host
->ios
.chip_select
= MMC_CS_DONTCARE
;
1188 host
->ios
.bus_mode
= MMC_BUSMODE_PUSHPULL
;
1189 host
->ios
.bus_width
= MMC_BUS_WIDTH_1
;
1190 host
->ios
.timing
= MMC_TIMING_LEGACY
;
1191 host
->ios
.drv_type
= 0;
1197 * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number
1198 * @vdd: voltage (mV)
1199 * @low_bits: prefer low bits in boundary cases
1201 * This function returns the OCR bit number according to the provided @vdd
1202 * value. If conversion is not possible a negative errno value returned.
1204 * Depending on the @low_bits flag the function prefers low or high OCR bits
1205 * on boundary voltages. For example,
1206 * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33);
1207 * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34);
1209 * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21).
1211 static int mmc_vdd_to_ocrbitnum(int vdd
, bool low_bits
)
1213 const int max_bit
= ilog2(MMC_VDD_35_36
);
1216 if (vdd
< 1650 || vdd
> 3600)
1219 if (vdd
>= 1650 && vdd
<= 1950)
1220 return ilog2(MMC_VDD_165_195
);
1225 /* Base 2000 mV, step 100 mV, bit's base 8. */
1226 bit
= (vdd
- 2000) / 100 + 8;
1233 * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask
1234 * @vdd_min: minimum voltage value (mV)
1235 * @vdd_max: maximum voltage value (mV)
1237 * This function returns the OCR mask bits according to the provided @vdd_min
1238 * and @vdd_max values. If conversion is not possible the function returns 0.
1240 * Notes wrt boundary cases:
1241 * This function sets the OCR bits for all boundary voltages, for example
1242 * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 |
1243 * MMC_VDD_34_35 mask.
1245 u32
mmc_vddrange_to_ocrmask(int vdd_min
, int vdd_max
)
1249 if (vdd_max
< vdd_min
)
1252 /* Prefer high bits for the boundary vdd_max values. */
1253 vdd_max
= mmc_vdd_to_ocrbitnum(vdd_max
, false);
1257 /* Prefer low bits for the boundary vdd_min values. */
1258 vdd_min
= mmc_vdd_to_ocrbitnum(vdd_min
, true);
1262 /* Fill the mask, from max bit to min bit. */
1263 while (vdd_max
>= vdd_min
)
1264 mask
|= 1 << vdd_max
--;
1268 EXPORT_SYMBOL(mmc_vddrange_to_ocrmask
);
1273 * mmc_of_parse_voltage - return mask of supported voltages
1274 * @np: The device node need to be parsed.
1275 * @mask: mask of voltages available for MMC/SD/SDIO
1277 * 1. Return zero on success.
1278 * 2. Return negative errno: voltage-range is invalid.
1280 int mmc_of_parse_voltage(struct device_node
*np
, u32
*mask
)
1282 const u32
*voltage_ranges
;
1285 voltage_ranges
= of_get_property(np
, "voltage-ranges", &num_ranges
);
1286 num_ranges
= num_ranges
/ sizeof(*voltage_ranges
) / 2;
1287 if (!voltage_ranges
|| !num_ranges
) {
1288 pr_info("%s: voltage-ranges unspecified\n", np
->full_name
);
1292 for (i
= 0; i
< num_ranges
; i
++) {
1293 const int j
= i
* 2;
1296 ocr_mask
= mmc_vddrange_to_ocrmask(
1297 be32_to_cpu(voltage_ranges
[j
]),
1298 be32_to_cpu(voltage_ranges
[j
+ 1]));
1300 pr_err("%s: voltage-range #%d is invalid\n",
1309 EXPORT_SYMBOL(mmc_of_parse_voltage
);
1311 #endif /* CONFIG_OF */
1313 static int mmc_of_get_func_num(struct device_node
*node
)
1318 ret
= of_property_read_u32(node
, "reg", ®
);
1325 struct device_node
*mmc_of_find_child_device(struct mmc_host
*host
,
1328 struct device_node
*node
;
1330 if (!host
->parent
|| !host
->parent
->of_node
)
1333 for_each_child_of_node(host
->parent
->of_node
, node
) {
1334 if (mmc_of_get_func_num(node
) == func_num
)
1341 #ifdef CONFIG_REGULATOR
1344 * mmc_regulator_get_ocrmask - return mask of supported voltages
1345 * @supply: regulator to use
1347 * This returns either a negative errno, or a mask of voltages that
1348 * can be provided to MMC/SD/SDIO devices using the specified voltage
1349 * regulator. This would normally be called before registering the
1352 int mmc_regulator_get_ocrmask(struct regulator
*supply
)
1360 count
= regulator_count_voltages(supply
);
1364 for (i
= 0; i
< count
; i
++) {
1365 vdd_uV
= regulator_list_voltage(supply
, i
);
1369 vdd_mV
= vdd_uV
/ 1000;
1370 result
|= mmc_vddrange_to_ocrmask(vdd_mV
, vdd_mV
);
1374 vdd_uV
= regulator_get_voltage(supply
);
1378 vdd_mV
= vdd_uV
/ 1000;
1379 result
= mmc_vddrange_to_ocrmask(vdd_mV
, vdd_mV
);
1384 EXPORT_SYMBOL_GPL(mmc_regulator_get_ocrmask
);
1387 * mmc_regulator_set_ocr - set regulator to match host->ios voltage
1388 * @mmc: the host to regulate
1389 * @supply: regulator to use
1390 * @vdd_bit: zero for power off, else a bit number (host->ios.vdd)
1392 * Returns zero on success, else negative errno.
1394 * MMC host drivers may use this to enable or disable a regulator using
1395 * a particular supply voltage. This would normally be called from the
1398 int mmc_regulator_set_ocr(struct mmc_host
*mmc
,
1399 struct regulator
*supply
,
1400 unsigned short vdd_bit
)
1409 * REVISIT mmc_vddrange_to_ocrmask() may have set some
1410 * bits this regulator doesn't quite support ... don't
1411 * be too picky, most cards and regulators are OK with
1412 * a 0.1V range goof (it's a small error percentage).
1414 tmp
= vdd_bit
- ilog2(MMC_VDD_165_195
);
1416 min_uV
= 1650 * 1000;
1417 max_uV
= 1950 * 1000;
1419 min_uV
= 1900 * 1000 + tmp
* 100 * 1000;
1420 max_uV
= min_uV
+ 100 * 1000;
1423 result
= regulator_set_voltage(supply
, min_uV
, max_uV
);
1424 if (result
== 0 && !mmc
->regulator_enabled
) {
1425 result
= regulator_enable(supply
);
1427 mmc
->regulator_enabled
= true;
1429 } else if (mmc
->regulator_enabled
) {
1430 result
= regulator_disable(supply
);
1432 mmc
->regulator_enabled
= false;
1436 dev_err(mmc_dev(mmc
),
1437 "could not set regulator OCR (%d)\n", result
);
1440 EXPORT_SYMBOL_GPL(mmc_regulator_set_ocr
);
1442 #endif /* CONFIG_REGULATOR */
1444 int mmc_regulator_get_supply(struct mmc_host
*mmc
)
1446 struct device
*dev
= mmc_dev(mmc
);
1449 mmc
->supply
.vmmc
= devm_regulator_get_optional(dev
, "vmmc");
1450 mmc
->supply
.vqmmc
= devm_regulator_get_optional(dev
, "vqmmc");
1452 if (IS_ERR(mmc
->supply
.vmmc
)) {
1453 if (PTR_ERR(mmc
->supply
.vmmc
) == -EPROBE_DEFER
)
1454 return -EPROBE_DEFER
;
1455 dev_info(dev
, "No vmmc regulator found\n");
1457 ret
= mmc_regulator_get_ocrmask(mmc
->supply
.vmmc
);
1459 mmc
->ocr_avail
= ret
;
1461 dev_warn(dev
, "Failed getting OCR mask: %d\n", ret
);
1464 if (IS_ERR(mmc
->supply
.vqmmc
)) {
1465 if (PTR_ERR(mmc
->supply
.vqmmc
) == -EPROBE_DEFER
)
1466 return -EPROBE_DEFER
;
1467 dev_info(dev
, "No vqmmc regulator found\n");
1472 EXPORT_SYMBOL_GPL(mmc_regulator_get_supply
);
1475 * Mask off any voltages we don't support and select
1476 * the lowest voltage
1478 u32
mmc_select_voltage(struct mmc_host
*host
, u32 ocr
)
1483 * Sanity check the voltages that the card claims to
1487 dev_warn(mmc_dev(host
),
1488 "card claims to support voltages below defined range\n");
1492 ocr
&= host
->ocr_avail
;
1494 dev_warn(mmc_dev(host
), "no support for card's volts\n");
1498 if (host
->caps2
& MMC_CAP2_FULL_PWR_CYCLE
) {
1501 mmc_power_cycle(host
, ocr
);
1505 if (bit
!= host
->ios
.vdd
)
1506 dev_warn(mmc_dev(host
), "exceeding card's volts\n");
1512 int __mmc_set_signal_voltage(struct mmc_host
*host
, int signal_voltage
)
1515 int old_signal_voltage
= host
->ios
.signal_voltage
;
1517 host
->ios
.signal_voltage
= signal_voltage
;
1518 if (host
->ops
->start_signal_voltage_switch
) {
1519 mmc_host_clk_hold(host
);
1520 err
= host
->ops
->start_signal_voltage_switch(host
, &host
->ios
);
1521 mmc_host_clk_release(host
);
1525 host
->ios
.signal_voltage
= old_signal_voltage
;
1531 int mmc_set_signal_voltage(struct mmc_host
*host
, int signal_voltage
, u32 ocr
)
1533 struct mmc_command cmd
= {0};
1540 * Send CMD11 only if the request is to switch the card to
1543 if (signal_voltage
== MMC_SIGNAL_VOLTAGE_330
)
1544 return __mmc_set_signal_voltage(host
, signal_voltage
);
1547 * If we cannot switch voltages, return failure so the caller
1548 * can continue without UHS mode
1550 if (!host
->ops
->start_signal_voltage_switch
)
1552 if (!host
->ops
->card_busy
)
1553 pr_warn("%s: cannot verify signal voltage switch\n",
1554 mmc_hostname(host
));
1556 mmc_host_clk_hold(host
);
1558 cmd
.opcode
= SD_SWITCH_VOLTAGE
;
1560 cmd
.flags
= MMC_RSP_R1
| MMC_CMD_AC
;
1562 err
= mmc_wait_for_cmd(host
, &cmd
, 0);
1566 if (!mmc_host_is_spi(host
) && (cmd
.resp
[0] & R1_ERROR
)) {
1571 * The card should drive cmd and dat[0:3] low immediately
1572 * after the response of cmd11, but wait 1 ms to be sure
1575 if (host
->ops
->card_busy
&& !host
->ops
->card_busy(host
)) {
1580 * During a signal voltage level switch, the clock must be gated
1581 * for 5 ms according to the SD spec
1583 clock
= host
->ios
.clock
;
1584 host
->ios
.clock
= 0;
1587 if (__mmc_set_signal_voltage(host
, signal_voltage
)) {
1589 * Voltages may not have been switched, but we've already
1590 * sent CMD11, so a power cycle is required anyway
1596 /* Keep clock gated for at least 10 ms, though spec only says 5 ms */
1598 host
->ios
.clock
= clock
;
1601 /* Wait for at least 1 ms according to spec */
1605 * Failure to switch is indicated by the card holding
1608 if (host
->ops
->card_busy
&& host
->ops
->card_busy(host
))
1613 pr_debug("%s: Signal voltage switch failed, "
1614 "power cycling card\n", mmc_hostname(host
));
1615 mmc_power_cycle(host
, ocr
);
1619 mmc_host_clk_release(host
);
1625 * Select timing parameters for host.
1627 void mmc_set_timing(struct mmc_host
*host
, unsigned int timing
)
1629 mmc_host_clk_hold(host
);
1630 host
->ios
.timing
= timing
;
1632 mmc_host_clk_release(host
);
1636 * Select appropriate driver type for host.
1638 void mmc_set_driver_type(struct mmc_host
*host
, unsigned int drv_type
)
1640 mmc_host_clk_hold(host
);
1641 host
->ios
.drv_type
= drv_type
;
1643 mmc_host_clk_release(host
);
1646 int mmc_select_drive_strength(struct mmc_card
*card
, unsigned int max_dtr
,
1647 int card_drv_type
, int *drv_type
)
1649 struct mmc_host
*host
= card
->host
;
1650 int host_drv_type
= SD_DRIVER_TYPE_B
;
1655 if (!host
->ops
->select_drive_strength
)
1658 /* Use SD definition of driver strength for hosts */
1659 if (host
->caps
& MMC_CAP_DRIVER_TYPE_A
)
1660 host_drv_type
|= SD_DRIVER_TYPE_A
;
1662 if (host
->caps
& MMC_CAP_DRIVER_TYPE_C
)
1663 host_drv_type
|= SD_DRIVER_TYPE_C
;
1665 if (host
->caps
& MMC_CAP_DRIVER_TYPE_D
)
1666 host_drv_type
|= SD_DRIVER_TYPE_D
;
1669 * The drive strength that the hardware can support
1670 * depends on the board design. Pass the appropriate
1671 * information and let the hardware specific code
1672 * return what is possible given the options
1674 mmc_host_clk_hold(host
);
1675 drive_strength
= host
->ops
->select_drive_strength(card
, max_dtr
,
1679 mmc_host_clk_release(host
);
1681 return drive_strength
;
1685 * Apply power to the MMC stack. This is a two-stage process.
1686 * First, we enable power to the card without the clock running.
1687 * We then wait a bit for the power to stabilise. Finally,
1688 * enable the bus drivers and clock to the card.
1690 * We must _NOT_ enable the clock prior to power stablising.
1692 * If a host does all the power sequencing itself, ignore the
1693 * initial MMC_POWER_UP stage.
1695 void mmc_power_up(struct mmc_host
*host
, u32 ocr
)
1697 if (host
->ios
.power_mode
== MMC_POWER_ON
)
1700 mmc_host_clk_hold(host
);
1702 mmc_pwrseq_pre_power_on(host
);
1704 host
->ios
.vdd
= fls(ocr
) - 1;
1705 host
->ios
.power_mode
= MMC_POWER_UP
;
1706 /* Set initial state and call mmc_set_ios */
1707 mmc_set_initial_state(host
);
1709 /* Try to set signal voltage to 3.3V but fall back to 1.8v or 1.2v */
1710 if (__mmc_set_signal_voltage(host
, MMC_SIGNAL_VOLTAGE_330
) == 0)
1711 dev_dbg(mmc_dev(host
), "Initial signal voltage of 3.3v\n");
1712 else if (__mmc_set_signal_voltage(host
, MMC_SIGNAL_VOLTAGE_180
) == 0)
1713 dev_dbg(mmc_dev(host
), "Initial signal voltage of 1.8v\n");
1714 else if (__mmc_set_signal_voltage(host
, MMC_SIGNAL_VOLTAGE_120
) == 0)
1715 dev_dbg(mmc_dev(host
), "Initial signal voltage of 1.2v\n");
1718 * This delay should be sufficient to allow the power supply
1719 * to reach the minimum voltage.
1723 mmc_pwrseq_post_power_on(host
);
1725 host
->ios
.clock
= host
->f_init
;
1727 host
->ios
.power_mode
= MMC_POWER_ON
;
1731 * This delay must be at least 74 clock sizes, or 1 ms, or the
1732 * time required to reach a stable voltage.
1736 mmc_host_clk_release(host
);
1739 void mmc_power_off(struct mmc_host
*host
)
1741 if (host
->ios
.power_mode
== MMC_POWER_OFF
)
1744 mmc_host_clk_hold(host
);
1746 mmc_pwrseq_power_off(host
);
1748 host
->ios
.clock
= 0;
1751 host
->ios
.power_mode
= MMC_POWER_OFF
;
1752 /* Set initial state and call mmc_set_ios */
1753 mmc_set_initial_state(host
);
1756 * Some configurations, such as the 802.11 SDIO card in the OLPC
1757 * XO-1.5, require a short delay after poweroff before the card
1758 * can be successfully turned on again.
1762 mmc_host_clk_release(host
);
1765 void mmc_power_cycle(struct mmc_host
*host
, u32 ocr
)
1767 mmc_power_off(host
);
1768 /* Wait at least 1 ms according to SD spec */
1770 mmc_power_up(host
, ocr
);
1774 * Cleanup when the last reference to the bus operator is dropped.
1776 static void __mmc_release_bus(struct mmc_host
*host
)
1779 BUG_ON(host
->bus_refs
);
1780 BUG_ON(!host
->bus_dead
);
1782 host
->bus_ops
= NULL
;
1786 * Increase reference count of bus operator
1788 static inline void mmc_bus_get(struct mmc_host
*host
)
1790 unsigned long flags
;
1792 spin_lock_irqsave(&host
->lock
, flags
);
1794 spin_unlock_irqrestore(&host
->lock
, flags
);
1798 * Decrease reference count of bus operator and free it if
1799 * it is the last reference.
1801 static inline void mmc_bus_put(struct mmc_host
*host
)
1803 unsigned long flags
;
1805 spin_lock_irqsave(&host
->lock
, flags
);
1807 if ((host
->bus_refs
== 0) && host
->bus_ops
)
1808 __mmc_release_bus(host
);
1809 spin_unlock_irqrestore(&host
->lock
, flags
);
1813 * Assign a mmc bus handler to a host. Only one bus handler may control a
1814 * host at any given time.
1816 void mmc_attach_bus(struct mmc_host
*host
, const struct mmc_bus_ops
*ops
)
1818 unsigned long flags
;
1823 WARN_ON(!host
->claimed
);
1825 spin_lock_irqsave(&host
->lock
, flags
);
1827 BUG_ON(host
->bus_ops
);
1828 BUG_ON(host
->bus_refs
);
1830 host
->bus_ops
= ops
;
1834 spin_unlock_irqrestore(&host
->lock
, flags
);
1838 * Remove the current bus handler from a host.
1840 void mmc_detach_bus(struct mmc_host
*host
)
1842 unsigned long flags
;
1846 WARN_ON(!host
->claimed
);
1847 WARN_ON(!host
->bus_ops
);
1849 spin_lock_irqsave(&host
->lock
, flags
);
1853 spin_unlock_irqrestore(&host
->lock
, flags
);
1858 static void _mmc_detect_change(struct mmc_host
*host
, unsigned long delay
,
1861 #ifdef CONFIG_MMC_DEBUG
1862 unsigned long flags
;
1863 spin_lock_irqsave(&host
->lock
, flags
);
1864 WARN_ON(host
->removed
);
1865 spin_unlock_irqrestore(&host
->lock
, flags
);
1869 * If the device is configured as wakeup, we prevent a new sleep for
1870 * 5 s to give provision for user space to consume the event.
1872 if (cd_irq
&& !(host
->caps
& MMC_CAP_NEEDS_POLL
) &&
1873 device_can_wakeup(mmc_dev(host
)))
1874 pm_wakeup_event(mmc_dev(host
), 5000);
1876 host
->detect_change
= 1;
1877 mmc_schedule_delayed_work(&host
->detect
, delay
);
1881 * mmc_detect_change - process change of state on a MMC socket
1882 * @host: host which changed state.
1883 * @delay: optional delay to wait before detection (jiffies)
1885 * MMC drivers should call this when they detect a card has been
1886 * inserted or removed. The MMC layer will confirm that any
1887 * present card is still functional, and initialize any newly
1890 void mmc_detect_change(struct mmc_host
*host
, unsigned long delay
)
1892 _mmc_detect_change(host
, delay
, true);
1894 EXPORT_SYMBOL(mmc_detect_change
);
1896 void mmc_init_erase(struct mmc_card
*card
)
1900 if (is_power_of_2(card
->erase_size
))
1901 card
->erase_shift
= ffs(card
->erase_size
) - 1;
1903 card
->erase_shift
= 0;
1906 * It is possible to erase an arbitrarily large area of an SD or MMC
1907 * card. That is not desirable because it can take a long time
1908 * (minutes) potentially delaying more important I/O, and also the
1909 * timeout calculations become increasingly hugely over-estimated.
1910 * Consequently, 'pref_erase' is defined as a guide to limit erases
1911 * to that size and alignment.
1913 * For SD cards that define Allocation Unit size, limit erases to one
1914 * Allocation Unit at a time. For MMC cards that define High Capacity
1915 * Erase Size, whether it is switched on or not, limit to that size.
1916 * Otherwise just have a stab at a good value. For modern cards it
1917 * will end up being 4MiB. Note that if the value is too small, it
1918 * can end up taking longer to erase.
1920 if (mmc_card_sd(card
) && card
->ssr
.au
) {
1921 card
->pref_erase
= card
->ssr
.au
;
1922 card
->erase_shift
= ffs(card
->ssr
.au
) - 1;
1923 } else if (card
->ext_csd
.hc_erase_size
) {
1924 card
->pref_erase
= card
->ext_csd
.hc_erase_size
;
1925 } else if (card
->erase_size
) {
1926 sz
= (card
->csd
.capacity
<< (card
->csd
.read_blkbits
- 9)) >> 11;
1928 card
->pref_erase
= 512 * 1024 / 512;
1930 card
->pref_erase
= 1024 * 1024 / 512;
1932 card
->pref_erase
= 2 * 1024 * 1024 / 512;
1934 card
->pref_erase
= 4 * 1024 * 1024 / 512;
1935 if (card
->pref_erase
< card
->erase_size
)
1936 card
->pref_erase
= card
->erase_size
;
1938 sz
= card
->pref_erase
% card
->erase_size
;
1940 card
->pref_erase
+= card
->erase_size
- sz
;
1943 card
->pref_erase
= 0;
1946 static unsigned int mmc_mmc_erase_timeout(struct mmc_card
*card
,
1947 unsigned int arg
, unsigned int qty
)
1949 unsigned int erase_timeout
;
1951 if (arg
== MMC_DISCARD_ARG
||
1952 (arg
== MMC_TRIM_ARG
&& card
->ext_csd
.rev
>= 6)) {
1953 erase_timeout
= card
->ext_csd
.trim_timeout
;
1954 } else if (card
->ext_csd
.erase_group_def
& 1) {
1955 /* High Capacity Erase Group Size uses HC timeouts */
1956 if (arg
== MMC_TRIM_ARG
)
1957 erase_timeout
= card
->ext_csd
.trim_timeout
;
1959 erase_timeout
= card
->ext_csd
.hc_erase_timeout
;
1961 /* CSD Erase Group Size uses write timeout */
1962 unsigned int mult
= (10 << card
->csd
.r2w_factor
);
1963 unsigned int timeout_clks
= card
->csd
.tacc_clks
* mult
;
1964 unsigned int timeout_us
;
1966 /* Avoid overflow: e.g. tacc_ns=80000000 mult=1280 */
1967 if (card
->csd
.tacc_ns
< 1000000)
1968 timeout_us
= (card
->csd
.tacc_ns
* mult
) / 1000;
1970 timeout_us
= (card
->csd
.tacc_ns
/ 1000) * mult
;
1973 * ios.clock is only a target. The real clock rate might be
1974 * less but not that much less, so fudge it by multiplying by 2.
1977 timeout_us
+= (timeout_clks
* 1000) /
1978 (mmc_host_clk_rate(card
->host
) / 1000);
1980 erase_timeout
= timeout_us
/ 1000;
1983 * Theoretically, the calculation could underflow so round up
1984 * to 1ms in that case.
1990 /* Multiplier for secure operations */
1991 if (arg
& MMC_SECURE_ARGS
) {
1992 if (arg
== MMC_SECURE_ERASE_ARG
)
1993 erase_timeout
*= card
->ext_csd
.sec_erase_mult
;
1995 erase_timeout
*= card
->ext_csd
.sec_trim_mult
;
1998 erase_timeout
*= qty
;
2001 * Ensure at least a 1 second timeout for SPI as per
2002 * 'mmc_set_data_timeout()'
2004 if (mmc_host_is_spi(card
->host
) && erase_timeout
< 1000)
2005 erase_timeout
= 1000;
2007 return erase_timeout
;
2010 static unsigned int mmc_sd_erase_timeout(struct mmc_card
*card
,
2014 unsigned int erase_timeout
;
2016 if (card
->ssr
.erase_timeout
) {
2017 /* Erase timeout specified in SD Status Register (SSR) */
2018 erase_timeout
= card
->ssr
.erase_timeout
* qty
+
2019 card
->ssr
.erase_offset
;
2022 * Erase timeout not specified in SD Status Register (SSR) so
2023 * use 250ms per write block.
2025 erase_timeout
= 250 * qty
;
2028 /* Must not be less than 1 second */
2029 if (erase_timeout
< 1000)
2030 erase_timeout
= 1000;
2032 return erase_timeout
;
2035 static unsigned int mmc_erase_timeout(struct mmc_card
*card
,
2039 if (mmc_card_sd(card
))
2040 return mmc_sd_erase_timeout(card
, arg
, qty
);
2042 return mmc_mmc_erase_timeout(card
, arg
, qty
);
2045 static int mmc_do_erase(struct mmc_card
*card
, unsigned int from
,
2046 unsigned int to
, unsigned int arg
)
2048 struct mmc_command cmd
= {0};
2049 unsigned int qty
= 0;
2050 unsigned long timeout
;
2053 mmc_retune_hold(card
->host
);
2056 * qty is used to calculate the erase timeout which depends on how many
2057 * erase groups (or allocation units in SD terminology) are affected.
2058 * We count erasing part of an erase group as one erase group.
2059 * For SD, the allocation units are always a power of 2. For MMC, the
2060 * erase group size is almost certainly also power of 2, but it does not
2061 * seem to insist on that in the JEDEC standard, so we fall back to
2062 * division in that case. SD may not specify an allocation unit size,
2063 * in which case the timeout is based on the number of write blocks.
2065 * Note that the timeout for secure trim 2 will only be correct if the
2066 * number of erase groups specified is the same as the total of all
2067 * preceding secure trim 1 commands. Since the power may have been
2068 * lost since the secure trim 1 commands occurred, it is generally
2069 * impossible to calculate the secure trim 2 timeout correctly.
2071 if (card
->erase_shift
)
2072 qty
+= ((to
>> card
->erase_shift
) -
2073 (from
>> card
->erase_shift
)) + 1;
2074 else if (mmc_card_sd(card
))
2075 qty
+= to
- from
+ 1;
2077 qty
+= ((to
/ card
->erase_size
) -
2078 (from
/ card
->erase_size
)) + 1;
2080 if (!mmc_card_blockaddr(card
)) {
2085 if (mmc_card_sd(card
))
2086 cmd
.opcode
= SD_ERASE_WR_BLK_START
;
2088 cmd
.opcode
= MMC_ERASE_GROUP_START
;
2090 cmd
.flags
= MMC_RSP_SPI_R1
| MMC_RSP_R1
| MMC_CMD_AC
;
2091 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 0);
2093 pr_err("mmc_erase: group start error %d, "
2094 "status %#x\n", err
, cmd
.resp
[0]);
2099 memset(&cmd
, 0, sizeof(struct mmc_command
));
2100 if (mmc_card_sd(card
))
2101 cmd
.opcode
= SD_ERASE_WR_BLK_END
;
2103 cmd
.opcode
= MMC_ERASE_GROUP_END
;
2105 cmd
.flags
= MMC_RSP_SPI_R1
| MMC_RSP_R1
| MMC_CMD_AC
;
2106 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 0);
2108 pr_err("mmc_erase: group end error %d, status %#x\n",
2114 memset(&cmd
, 0, sizeof(struct mmc_command
));
2115 cmd
.opcode
= MMC_ERASE
;
2117 cmd
.flags
= MMC_RSP_SPI_R1B
| MMC_RSP_R1B
| MMC_CMD_AC
;
2118 cmd
.busy_timeout
= mmc_erase_timeout(card
, arg
, qty
);
2119 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 0);
2121 pr_err("mmc_erase: erase error %d, status %#x\n",
2127 if (mmc_host_is_spi(card
->host
))
2130 timeout
= jiffies
+ msecs_to_jiffies(MMC_CORE_TIMEOUT_MS
);
2132 memset(&cmd
, 0, sizeof(struct mmc_command
));
2133 cmd
.opcode
= MMC_SEND_STATUS
;
2134 cmd
.arg
= card
->rca
<< 16;
2135 cmd
.flags
= MMC_RSP_R1
| MMC_CMD_AC
;
2136 /* Do not retry else we can't see errors */
2137 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 0);
2138 if (err
|| (cmd
.resp
[0] & 0xFDF92000)) {
2139 pr_err("error %d requesting status %#x\n",
2145 /* Timeout if the device never becomes ready for data and
2146 * never leaves the program state.
2148 if (time_after(jiffies
, timeout
)) {
2149 pr_err("%s: Card stuck in programming state! %s\n",
2150 mmc_hostname(card
->host
), __func__
);
2155 } while (!(cmd
.resp
[0] & R1_READY_FOR_DATA
) ||
2156 (R1_CURRENT_STATE(cmd
.resp
[0]) == R1_STATE_PRG
));
2158 mmc_retune_release(card
->host
);
2163 * mmc_erase - erase sectors.
2164 * @card: card to erase
2165 * @from: first sector to erase
2166 * @nr: number of sectors to erase
2167 * @arg: erase command argument (SD supports only %MMC_ERASE_ARG)
2169 * Caller must claim host before calling this function.
2171 int mmc_erase(struct mmc_card
*card
, unsigned int from
, unsigned int nr
,
2174 unsigned int rem
, to
= from
+ nr
;
2177 if (!(card
->host
->caps
& MMC_CAP_ERASE
) ||
2178 !(card
->csd
.cmdclass
& CCC_ERASE
))
2181 if (!card
->erase_size
)
2184 if (mmc_card_sd(card
) && arg
!= MMC_ERASE_ARG
)
2187 if ((arg
& MMC_SECURE_ARGS
) &&
2188 !(card
->ext_csd
.sec_feature_support
& EXT_CSD_SEC_ER_EN
))
2191 if ((arg
& MMC_TRIM_ARGS
) &&
2192 !(card
->ext_csd
.sec_feature_support
& EXT_CSD_SEC_GB_CL_EN
))
2195 if (arg
== MMC_SECURE_ERASE_ARG
) {
2196 if (from
% card
->erase_size
|| nr
% card
->erase_size
)
2200 if (arg
== MMC_ERASE_ARG
) {
2201 rem
= from
% card
->erase_size
;
2203 rem
= card
->erase_size
- rem
;
2210 rem
= nr
% card
->erase_size
;
2223 /* 'from' and 'to' are inclusive */
2227 * Special case where only one erase-group fits in the timeout budget:
2228 * If the region crosses an erase-group boundary on this particular
2229 * case, we will be trimming more than one erase-group which, does not
2230 * fit in the timeout budget of the controller, so we need to split it
2231 * and call mmc_do_erase() twice if necessary. This special case is
2232 * identified by the card->eg_boundary flag.
2234 rem
= card
->erase_size
- (from
% card
->erase_size
);
2235 if ((arg
& MMC_TRIM_ARGS
) && (card
->eg_boundary
) && (nr
> rem
)) {
2236 err
= mmc_do_erase(card
, from
, from
+ rem
- 1, arg
);
2238 if ((err
) || (to
<= from
))
2242 return mmc_do_erase(card
, from
, to
, arg
);
2244 EXPORT_SYMBOL(mmc_erase
);
2246 int mmc_can_erase(struct mmc_card
*card
)
2248 if ((card
->host
->caps
& MMC_CAP_ERASE
) &&
2249 (card
->csd
.cmdclass
& CCC_ERASE
) && card
->erase_size
)
2253 EXPORT_SYMBOL(mmc_can_erase
);
2255 int mmc_can_trim(struct mmc_card
*card
)
2257 if ((card
->ext_csd
.sec_feature_support
& EXT_CSD_SEC_GB_CL_EN
) &&
2258 (!(card
->quirks
& MMC_QUIRK_TRIM_BROKEN
)))
2262 EXPORT_SYMBOL(mmc_can_trim
);
2264 int mmc_can_discard(struct mmc_card
*card
)
2267 * As there's no way to detect the discard support bit at v4.5
2268 * use the s/w feature support filed.
2270 if (card
->ext_csd
.feature_support
& MMC_DISCARD_FEATURE
)
2274 EXPORT_SYMBOL(mmc_can_discard
);
2276 int mmc_can_sanitize(struct mmc_card
*card
)
2278 if (!mmc_can_trim(card
) && !mmc_can_erase(card
))
2280 if (card
->ext_csd
.sec_feature_support
& EXT_CSD_SEC_SANITIZE
)
2284 EXPORT_SYMBOL(mmc_can_sanitize
);
2286 int mmc_can_secure_erase_trim(struct mmc_card
*card
)
2288 if ((card
->ext_csd
.sec_feature_support
& EXT_CSD_SEC_ER_EN
) &&
2289 !(card
->quirks
& MMC_QUIRK_SEC_ERASE_TRIM_BROKEN
))
2293 EXPORT_SYMBOL(mmc_can_secure_erase_trim
);
2295 int mmc_erase_group_aligned(struct mmc_card
*card
, unsigned int from
,
2298 if (!card
->erase_size
)
2300 if (from
% card
->erase_size
|| nr
% card
->erase_size
)
2304 EXPORT_SYMBOL(mmc_erase_group_aligned
);
2306 static unsigned int mmc_do_calc_max_discard(struct mmc_card
*card
,
2309 struct mmc_host
*host
= card
->host
;
2310 unsigned int max_discard
, x
, y
, qty
= 0, max_qty
, timeout
;
2311 unsigned int last_timeout
= 0;
2313 if (card
->erase_shift
)
2314 max_qty
= UINT_MAX
>> card
->erase_shift
;
2315 else if (mmc_card_sd(card
))
2318 max_qty
= UINT_MAX
/ card
->erase_size
;
2320 /* Find the largest qty with an OK timeout */
2323 for (x
= 1; x
&& x
<= max_qty
&& max_qty
- x
>= qty
; x
<<= 1) {
2324 timeout
= mmc_erase_timeout(card
, arg
, qty
+ x
);
2325 if (timeout
> host
->max_busy_timeout
)
2327 if (timeout
< last_timeout
)
2329 last_timeout
= timeout
;
2339 * When specifying a sector range to trim, chances are we might cross
2340 * an erase-group boundary even if the amount of sectors is less than
2342 * If we can only fit one erase-group in the controller timeout budget,
2343 * we have to care that erase-group boundaries are not crossed by a
2344 * single trim operation. We flag that special case with "eg_boundary".
2345 * In all other cases we can just decrement qty and pretend that we
2346 * always touch (qty + 1) erase-groups as a simple optimization.
2349 card
->eg_boundary
= 1;
2353 /* Convert qty to sectors */
2354 if (card
->erase_shift
)
2355 max_discard
= qty
<< card
->erase_shift
;
2356 else if (mmc_card_sd(card
))
2357 max_discard
= qty
+ 1;
2359 max_discard
= qty
* card
->erase_size
;
2364 unsigned int mmc_calc_max_discard(struct mmc_card
*card
)
2366 struct mmc_host
*host
= card
->host
;
2367 unsigned int max_discard
, max_trim
;
2369 if (!host
->max_busy_timeout
)
2373 * Without erase_group_def set, MMC erase timeout depends on clock
2374 * frequence which can change. In that case, the best choice is
2375 * just the preferred erase size.
2377 if (mmc_card_mmc(card
) && !(card
->ext_csd
.erase_group_def
& 1))
2378 return card
->pref_erase
;
2380 max_discard
= mmc_do_calc_max_discard(card
, MMC_ERASE_ARG
);
2381 if (mmc_can_trim(card
)) {
2382 max_trim
= mmc_do_calc_max_discard(card
, MMC_TRIM_ARG
);
2383 if (max_trim
< max_discard
)
2384 max_discard
= max_trim
;
2385 } else if (max_discard
< card
->erase_size
) {
2388 pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n",
2389 mmc_hostname(host
), max_discard
, host
->max_busy_timeout
);
2392 EXPORT_SYMBOL(mmc_calc_max_discard
);
2394 int mmc_set_blocklen(struct mmc_card
*card
, unsigned int blocklen
)
2396 struct mmc_command cmd
= {0};
2398 if (mmc_card_blockaddr(card
) || mmc_card_ddr52(card
))
2401 cmd
.opcode
= MMC_SET_BLOCKLEN
;
2403 cmd
.flags
= MMC_RSP_SPI_R1
| MMC_RSP_R1
| MMC_CMD_AC
;
2404 return mmc_wait_for_cmd(card
->host
, &cmd
, 5);
2406 EXPORT_SYMBOL(mmc_set_blocklen
);
2408 int mmc_set_blockcount(struct mmc_card
*card
, unsigned int blockcount
,
2411 struct mmc_command cmd
= {0};
2413 cmd
.opcode
= MMC_SET_BLOCK_COUNT
;
2414 cmd
.arg
= blockcount
& 0x0000FFFF;
2417 cmd
.flags
= MMC_RSP_SPI_R1
| MMC_RSP_R1
| MMC_CMD_AC
;
2418 return mmc_wait_for_cmd(card
->host
, &cmd
, 5);
2420 EXPORT_SYMBOL(mmc_set_blockcount
);
2422 static void mmc_hw_reset_for_init(struct mmc_host
*host
)
2424 if (!(host
->caps
& MMC_CAP_HW_RESET
) || !host
->ops
->hw_reset
)
2426 mmc_host_clk_hold(host
);
2427 host
->ops
->hw_reset(host
);
2428 mmc_host_clk_release(host
);
2431 int mmc_hw_reset(struct mmc_host
*host
)
2439 if (!host
->bus_ops
|| host
->bus_dead
|| !host
->bus_ops
->reset
) {
2444 ret
= host
->bus_ops
->reset(host
);
2447 if (ret
!= -EOPNOTSUPP
)
2448 pr_warn("%s: tried to reset card\n", mmc_hostname(host
));
2452 EXPORT_SYMBOL(mmc_hw_reset
);
2454 static int mmc_rescan_try_freq(struct mmc_host
*host
, unsigned freq
)
2456 host
->f_init
= freq
;
2458 #ifdef CONFIG_MMC_DEBUG
2459 pr_info("%s: %s: trying to init card at %u Hz\n",
2460 mmc_hostname(host
), __func__
, host
->f_init
);
2462 mmc_power_up(host
, host
->ocr_avail
);
2465 * Some eMMCs (with VCCQ always on) may not be reset after power up, so
2466 * do a hardware reset if possible.
2468 mmc_hw_reset_for_init(host
);
2471 * sdio_reset sends CMD52 to reset card. Since we do not know
2472 * if the card is being re-initialized, just send it. CMD52
2473 * should be ignored by SD/eMMC cards.
2478 mmc_send_if_cond(host
, host
->ocr_avail
);
2480 /* Order's important: probe SDIO, then SD, then MMC */
2481 if (!mmc_attach_sdio(host
))
2483 if (!mmc_attach_sd(host
))
2485 if (!mmc_attach_mmc(host
))
2488 mmc_power_off(host
);
2492 int _mmc_detect_card_removed(struct mmc_host
*host
)
2496 if (host
->caps
& MMC_CAP_NONREMOVABLE
)
2499 if (!host
->card
|| mmc_card_removed(host
->card
))
2502 ret
= host
->bus_ops
->alive(host
);
2505 * Card detect status and alive check may be out of sync if card is
2506 * removed slowly, when card detect switch changes while card/slot
2507 * pads are still contacted in hardware (refer to "SD Card Mechanical
2508 * Addendum, Appendix C: Card Detection Switch"). So reschedule a
2509 * detect work 200ms later for this case.
2511 if (!ret
&& host
->ops
->get_cd
&& !host
->ops
->get_cd(host
)) {
2512 mmc_detect_change(host
, msecs_to_jiffies(200));
2513 pr_debug("%s: card removed too slowly\n", mmc_hostname(host
));
2517 mmc_card_set_removed(host
->card
);
2518 pr_debug("%s: card remove detected\n", mmc_hostname(host
));
2524 int mmc_detect_card_removed(struct mmc_host
*host
)
2526 struct mmc_card
*card
= host
->card
;
2529 WARN_ON(!host
->claimed
);
2534 ret
= mmc_card_removed(card
);
2536 * The card will be considered unchanged unless we have been asked to
2537 * detect a change or host requires polling to provide card detection.
2539 if (!host
->detect_change
&& !(host
->caps
& MMC_CAP_NEEDS_POLL
))
2542 host
->detect_change
= 0;
2544 ret
= _mmc_detect_card_removed(host
);
2545 if (ret
&& (host
->caps
& MMC_CAP_NEEDS_POLL
)) {
2547 * Schedule a detect work as soon as possible to let a
2548 * rescan handle the card removal.
2550 cancel_delayed_work(&host
->detect
);
2551 _mmc_detect_change(host
, 0, false);
2557 EXPORT_SYMBOL(mmc_detect_card_removed
);
2559 void mmc_rescan(struct work_struct
*work
)
2561 struct mmc_host
*host
=
2562 container_of(work
, struct mmc_host
, detect
.work
);
2565 if (host
->trigger_card_event
&& host
->ops
->card_event
) {
2566 host
->ops
->card_event(host
);
2567 host
->trigger_card_event
= false;
2570 if (host
->rescan_disable
)
2573 /* If there is a non-removable card registered, only scan once */
2574 if ((host
->caps
& MMC_CAP_NONREMOVABLE
) && host
->rescan_entered
)
2576 host
->rescan_entered
= 1;
2581 * if there is a _removable_ card registered, check whether it is
2584 if (host
->bus_ops
&& !host
->bus_dead
2585 && !(host
->caps
& MMC_CAP_NONREMOVABLE
))
2586 host
->bus_ops
->detect(host
);
2588 host
->detect_change
= 0;
2591 * Let mmc_bus_put() free the bus/bus_ops if we've found that
2592 * the card is no longer present.
2597 /* if there still is a card present, stop here */
2598 if (host
->bus_ops
!= NULL
) {
2604 * Only we can add a new handler, so it's safe to
2605 * release the lock here.
2609 if (!(host
->caps
& MMC_CAP_NONREMOVABLE
) && host
->ops
->get_cd
&&
2610 host
->ops
->get_cd(host
) == 0) {
2611 mmc_claim_host(host
);
2612 mmc_power_off(host
);
2613 mmc_release_host(host
);
2617 mmc_claim_host(host
);
2618 for (i
= 0; i
< ARRAY_SIZE(freqs
); i
++) {
2619 if (!mmc_rescan_try_freq(host
, max(freqs
[i
], host
->f_min
)))
2621 if (freqs
[i
] <= host
->f_min
)
2624 mmc_release_host(host
);
2627 if (host
->caps
& MMC_CAP_NEEDS_POLL
)
2628 mmc_schedule_delayed_work(&host
->detect
, HZ
);
2631 void mmc_start_host(struct mmc_host
*host
)
2633 host
->f_init
= max(freqs
[0], host
->f_min
);
2634 host
->rescan_disable
= 0;
2635 host
->ios
.power_mode
= MMC_POWER_UNDEFINED
;
2636 if (host
->caps2
& MMC_CAP2_NO_PRESCAN_POWERUP
)
2637 mmc_power_off(host
);
2639 mmc_power_up(host
, host
->ocr_avail
);
2640 mmc_gpiod_request_cd_irq(host
);
2641 _mmc_detect_change(host
, 0, false);
2644 void mmc_stop_host(struct mmc_host
*host
)
2646 #ifdef CONFIG_MMC_DEBUG
2647 unsigned long flags
;
2648 spin_lock_irqsave(&host
->lock
, flags
);
2650 spin_unlock_irqrestore(&host
->lock
, flags
);
2652 if (host
->slot
.cd_irq
>= 0)
2653 disable_irq(host
->slot
.cd_irq
);
2655 host
->rescan_disable
= 1;
2656 cancel_delayed_work_sync(&host
->detect
);
2657 mmc_flush_scheduled_work();
2659 /* clear pm flags now and let card drivers set them as needed */
2663 if (host
->bus_ops
&& !host
->bus_dead
) {
2664 /* Calling bus_ops->remove() with a claimed host can deadlock */
2665 host
->bus_ops
->remove(host
);
2666 mmc_claim_host(host
);
2667 mmc_detach_bus(host
);
2668 mmc_power_off(host
);
2669 mmc_release_host(host
);
2677 mmc_power_off(host
);
2680 int mmc_power_save_host(struct mmc_host
*host
)
2684 #ifdef CONFIG_MMC_DEBUG
2685 pr_info("%s: %s: powering down\n", mmc_hostname(host
), __func__
);
2690 if (!host
->bus_ops
|| host
->bus_dead
) {
2695 if (host
->bus_ops
->power_save
)
2696 ret
= host
->bus_ops
->power_save(host
);
2700 mmc_power_off(host
);
2704 EXPORT_SYMBOL(mmc_power_save_host
);
2706 int mmc_power_restore_host(struct mmc_host
*host
)
2710 #ifdef CONFIG_MMC_DEBUG
2711 pr_info("%s: %s: powering up\n", mmc_hostname(host
), __func__
);
2716 if (!host
->bus_ops
|| host
->bus_dead
) {
2721 mmc_power_up(host
, host
->card
->ocr
);
2722 ret
= host
->bus_ops
->power_restore(host
);
2728 EXPORT_SYMBOL(mmc_power_restore_host
);
2731 * Flush the cache to the non-volatile storage.
2733 int mmc_flush_cache(struct mmc_card
*card
)
2737 if (mmc_card_mmc(card
) &&
2738 (card
->ext_csd
.cache_size
> 0) &&
2739 (card
->ext_csd
.cache_ctrl
& 1)) {
2740 err
= mmc_switch(card
, EXT_CSD_CMD_SET_NORMAL
,
2741 EXT_CSD_FLUSH_CACHE
, 1, 0);
2743 pr_err("%s: cache flush error %d\n",
2744 mmc_hostname(card
->host
), err
);
2749 EXPORT_SYMBOL(mmc_flush_cache
);
2753 /* Do the card removal on suspend if card is assumed removeable
2754 * Do that in pm notifier while userspace isn't yet frozen, so we will be able
2757 int mmc_pm_notify(struct notifier_block
*notify_block
,
2758 unsigned long mode
, void *unused
)
2760 struct mmc_host
*host
= container_of(
2761 notify_block
, struct mmc_host
, pm_notify
);
2762 unsigned long flags
;
2766 case PM_HIBERNATION_PREPARE
:
2767 case PM_SUSPEND_PREPARE
:
2768 case PM_RESTORE_PREPARE
:
2769 spin_lock_irqsave(&host
->lock
, flags
);
2770 host
->rescan_disable
= 1;
2771 spin_unlock_irqrestore(&host
->lock
, flags
);
2772 cancel_delayed_work_sync(&host
->detect
);
2777 /* Validate prerequisites for suspend */
2778 if (host
->bus_ops
->pre_suspend
)
2779 err
= host
->bus_ops
->pre_suspend(host
);
2783 /* Calling bus_ops->remove() with a claimed host can deadlock */
2784 host
->bus_ops
->remove(host
);
2785 mmc_claim_host(host
);
2786 mmc_detach_bus(host
);
2787 mmc_power_off(host
);
2788 mmc_release_host(host
);
2792 case PM_POST_SUSPEND
:
2793 case PM_POST_HIBERNATION
:
2794 case PM_POST_RESTORE
:
2796 spin_lock_irqsave(&host
->lock
, flags
);
2797 host
->rescan_disable
= 0;
2798 spin_unlock_irqrestore(&host
->lock
, flags
);
2799 _mmc_detect_change(host
, 0, false);
2808 * mmc_init_context_info() - init synchronization context
2811 * Init struct context_info needed to implement asynchronous
2812 * request mechanism, used by mmc core, host driver and mmc requests
2815 void mmc_init_context_info(struct mmc_host
*host
)
2817 spin_lock_init(&host
->context_info
.lock
);
2818 host
->context_info
.is_new_req
= false;
2819 host
->context_info
.is_done_rcv
= false;
2820 host
->context_info
.is_waiting_last_req
= false;
2821 init_waitqueue_head(&host
->context_info
.wait
);
2824 static int __init
mmc_init(void)
2828 workqueue
= alloc_ordered_workqueue("kmmcd", 0);
2832 ret
= mmc_register_bus();
2834 goto destroy_workqueue
;
2836 ret
= mmc_register_host_class();
2838 goto unregister_bus
;
2840 ret
= sdio_register_bus();
2842 goto unregister_host_class
;
2846 unregister_host_class
:
2847 mmc_unregister_host_class();
2849 mmc_unregister_bus();
2851 destroy_workqueue(workqueue
);
2856 static void __exit
mmc_exit(void)
2858 sdio_unregister_bus();
2859 mmc_unregister_host_class();
2860 mmc_unregister_bus();
2861 destroy_workqueue(workqueue
);
2864 subsys_initcall(mmc_init
);
2865 module_exit(mmc_exit
);
2867 MODULE_LICENSE("GPL");