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>
30 #include <linux/mmc/card.h>
31 #include <linux/mmc/host.h>
32 #include <linux/mmc/mmc.h>
33 #include <linux/mmc/sd.h>
44 static struct workqueue_struct
*workqueue
;
47 * Enabling software CRCs on the data blocks can be a significant (30%)
48 * performance cost, and for other reasons may not always be desired.
49 * So we allow it it to be disabled.
52 module_param(use_spi_crc
, bool, 0);
55 * We normally treat cards as removed during suspend if they are not
56 * known to be on a non-removable bus, to avoid the risk of writing
57 * back data to a different card after resume. Allow this to be
58 * overridden if necessary.
60 #ifdef CONFIG_MMC_UNSAFE_RESUME
61 int mmc_assume_removable
;
63 int mmc_assume_removable
= 1;
65 EXPORT_SYMBOL(mmc_assume_removable
);
66 module_param_named(removable
, mmc_assume_removable
, bool, 0644);
69 "MMC/SD cards are removable and may be removed during suspend");
72 * Internal function. Schedule delayed work in the MMC work queue.
74 static int mmc_schedule_delayed_work(struct delayed_work
*work
,
77 return queue_delayed_work(workqueue
, work
, delay
);
81 * Internal function. Flush all scheduled work from the MMC work queue.
83 static void mmc_flush_scheduled_work(void)
85 flush_workqueue(workqueue
);
88 #ifdef CONFIG_FAIL_MMC_REQUEST
91 * Internal function. Inject random data errors.
92 * If mmc_data is NULL no errors are injected.
94 static void mmc_should_fail_request(struct mmc_host
*host
,
95 struct mmc_request
*mrq
)
97 struct mmc_command
*cmd
= mrq
->cmd
;
98 struct mmc_data
*data
= mrq
->data
;
99 static const int data_errors
[] = {
108 if (cmd
->error
|| data
->error
||
109 !should_fail(&host
->fail_mmc_request
, data
->blksz
* data
->blocks
))
112 data
->error
= data_errors
[random32() % ARRAY_SIZE(data_errors
)];
113 data
->bytes_xfered
= (random32() % (data
->bytes_xfered
>> 9)) << 9;
116 #else /* CONFIG_FAIL_MMC_REQUEST */
118 static inline void mmc_should_fail_request(struct mmc_host
*host
,
119 struct mmc_request
*mrq
)
123 #endif /* CONFIG_FAIL_MMC_REQUEST */
126 * mmc_request_done - finish processing an MMC request
127 * @host: MMC host which completed request
128 * @mrq: MMC request which request
130 * MMC drivers should call this function when they have completed
131 * their processing of a request.
133 void mmc_request_done(struct mmc_host
*host
, struct mmc_request
*mrq
)
135 struct mmc_command
*cmd
= mrq
->cmd
;
136 int err
= cmd
->error
;
138 if (err
&& cmd
->retries
&& mmc_host_is_spi(host
)) {
139 if (cmd
->resp
[0] & R1_SPI_ILLEGAL_COMMAND
)
143 if (err
&& cmd
->retries
) {
145 * Request starter must handle retries - see
146 * mmc_wait_for_req_done().
151 mmc_should_fail_request(host
, mrq
);
153 led_trigger_event(host
->led
, LED_OFF
);
155 pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n",
156 mmc_hostname(host
), cmd
->opcode
, err
,
157 cmd
->resp
[0], cmd
->resp
[1],
158 cmd
->resp
[2], cmd
->resp
[3]);
161 pr_debug("%s: %d bytes transferred: %d\n",
163 mrq
->data
->bytes_xfered
, mrq
->data
->error
);
167 pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n",
168 mmc_hostname(host
), mrq
->stop
->opcode
,
170 mrq
->stop
->resp
[0], mrq
->stop
->resp
[1],
171 mrq
->stop
->resp
[2], mrq
->stop
->resp
[3]);
177 mmc_host_clk_release(host
);
181 EXPORT_SYMBOL(mmc_request_done
);
184 mmc_start_request(struct mmc_host
*host
, struct mmc_request
*mrq
)
186 #ifdef CONFIG_MMC_DEBUG
188 struct scatterlist
*sg
;
191 pr_debug("%s: starting CMD%u arg %08x flags %08x\n",
192 mmc_hostname(host
), mrq
->cmd
->opcode
,
193 mrq
->cmd
->arg
, mrq
->cmd
->flags
);
196 pr_debug("%s: blksz %d blocks %d flags %08x "
197 "tsac %d ms nsac %d\n",
198 mmc_hostname(host
), mrq
->data
->blksz
,
199 mrq
->data
->blocks
, mrq
->data
->flags
,
200 mrq
->data
->timeout_ns
/ 1000000,
201 mrq
->data
->timeout_clks
);
205 pr_debug("%s: CMD%u arg %08x flags %08x\n",
206 mmc_hostname(host
), mrq
->stop
->opcode
,
207 mrq
->stop
->arg
, mrq
->stop
->flags
);
210 WARN_ON(!host
->claimed
);
215 BUG_ON(mrq
->data
->blksz
> host
->max_blk_size
);
216 BUG_ON(mrq
->data
->blocks
> host
->max_blk_count
);
217 BUG_ON(mrq
->data
->blocks
* mrq
->data
->blksz
>
220 #ifdef CONFIG_MMC_DEBUG
222 for_each_sg(mrq
->data
->sg
, sg
, mrq
->data
->sg_len
, i
)
224 BUG_ON(sz
!= mrq
->data
->blocks
* mrq
->data
->blksz
);
227 mrq
->cmd
->data
= mrq
->data
;
228 mrq
->data
->error
= 0;
229 mrq
->data
->mrq
= mrq
;
231 mrq
->data
->stop
= mrq
->stop
;
232 mrq
->stop
->error
= 0;
233 mrq
->stop
->mrq
= mrq
;
236 mmc_host_clk_hold(host
);
237 led_trigger_event(host
->led
, LED_FULL
);
238 host
->ops
->request(host
, mrq
);
241 static void mmc_wait_done(struct mmc_request
*mrq
)
243 complete(&mrq
->completion
);
246 static void __mmc_start_req(struct mmc_host
*host
, struct mmc_request
*mrq
)
248 init_completion(&mrq
->completion
);
249 mrq
->done
= mmc_wait_done
;
250 mmc_start_request(host
, mrq
);
253 static void mmc_wait_for_req_done(struct mmc_host
*host
,
254 struct mmc_request
*mrq
)
256 struct mmc_command
*cmd
;
259 wait_for_completion(&mrq
->completion
);
262 if (!cmd
->error
|| !cmd
->retries
)
265 pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
266 mmc_hostname(host
), cmd
->opcode
, cmd
->error
);
269 host
->ops
->request(host
, mrq
);
274 * mmc_pre_req - Prepare for a new request
275 * @host: MMC host to prepare command
276 * @mrq: MMC request to prepare for
277 * @is_first_req: true if there is no previous started request
278 * that may run in parellel to this call, otherwise false
280 * mmc_pre_req() is called in prior to mmc_start_req() to let
281 * host prepare for the new request. Preparation of a request may be
282 * performed while another request is running on the host.
284 static void mmc_pre_req(struct mmc_host
*host
, struct mmc_request
*mrq
,
287 if (host
->ops
->pre_req
)
288 host
->ops
->pre_req(host
, mrq
, is_first_req
);
292 * mmc_post_req - Post process a completed request
293 * @host: MMC host to post process command
294 * @mrq: MMC request to post process for
295 * @err: Error, if non zero, clean up any resources made in pre_req
297 * Let the host post process a completed request. Post processing of
298 * a request may be performed while another reuqest is running.
300 static void mmc_post_req(struct mmc_host
*host
, struct mmc_request
*mrq
,
303 if (host
->ops
->post_req
)
304 host
->ops
->post_req(host
, mrq
, err
);
308 * mmc_start_req - start a non-blocking request
309 * @host: MMC host to start command
310 * @areq: async request to start
311 * @error: out parameter returns 0 for success, otherwise non zero
313 * Start a new MMC custom command request for a host.
314 * If there is on ongoing async request wait for completion
315 * of that request and start the new one and return.
316 * Does not wait for the new request to complete.
318 * Returns the completed request, NULL in case of none completed.
319 * Wait for the an ongoing request (previoulsy started) to complete and
320 * return the completed request. If there is no ongoing request, NULL
321 * is returned without waiting. NULL is not an error condition.
323 struct mmc_async_req
*mmc_start_req(struct mmc_host
*host
,
324 struct mmc_async_req
*areq
, int *error
)
327 struct mmc_async_req
*data
= host
->areq
;
329 /* Prepare a new request */
331 mmc_pre_req(host
, areq
->mrq
, !host
->areq
);
334 mmc_wait_for_req_done(host
, host
->areq
->mrq
);
335 err
= host
->areq
->err_check(host
->card
, host
->areq
);
337 /* post process the completed failed request */
338 mmc_post_req(host
, host
->areq
->mrq
, 0);
341 * Cancel the new prepared request, because
342 * it can't run until the failed
343 * request has been properly handled.
345 mmc_post_req(host
, areq
->mrq
, -EINVAL
);
353 __mmc_start_req(host
, areq
->mrq
);
356 mmc_post_req(host
, host
->areq
->mrq
, 0);
364 EXPORT_SYMBOL(mmc_start_req
);
367 * mmc_wait_for_req - start a request and wait for completion
368 * @host: MMC host to start command
369 * @mrq: MMC request to start
371 * Start a new MMC custom command request for a host, and wait
372 * for the command to complete. Does not attempt to parse the
375 void mmc_wait_for_req(struct mmc_host
*host
, struct mmc_request
*mrq
)
377 __mmc_start_req(host
, mrq
);
378 mmc_wait_for_req_done(host
, mrq
);
380 EXPORT_SYMBOL(mmc_wait_for_req
);
383 * mmc_wait_for_cmd - start a command and wait for completion
384 * @host: MMC host to start command
385 * @cmd: MMC command to start
386 * @retries: maximum number of retries
388 * Start a new MMC command for a host, and wait for the command
389 * to complete. Return any error that occurred while the command
390 * was executing. Do not attempt to parse the response.
392 int mmc_wait_for_cmd(struct mmc_host
*host
, struct mmc_command
*cmd
, int retries
)
394 struct mmc_request mrq
= {NULL
};
396 WARN_ON(!host
->claimed
);
398 memset(cmd
->resp
, 0, sizeof(cmd
->resp
));
399 cmd
->retries
= retries
;
404 mmc_wait_for_req(host
, &mrq
);
409 EXPORT_SYMBOL(mmc_wait_for_cmd
);
412 * mmc_set_data_timeout - set the timeout for a data command
413 * @data: data phase for command
414 * @card: the MMC card associated with the data transfer
416 * Computes the data timeout parameters according to the
417 * correct algorithm given the card type.
419 void mmc_set_data_timeout(struct mmc_data
*data
, const struct mmc_card
*card
)
424 * SDIO cards only define an upper 1 s limit on access.
426 if (mmc_card_sdio(card
)) {
427 data
->timeout_ns
= 1000000000;
428 data
->timeout_clks
= 0;
433 * SD cards use a 100 multiplier rather than 10
435 mult
= mmc_card_sd(card
) ? 100 : 10;
438 * Scale up the multiplier (and therefore the timeout) by
439 * the r2w factor for writes.
441 if (data
->flags
& MMC_DATA_WRITE
)
442 mult
<<= card
->csd
.r2w_factor
;
444 data
->timeout_ns
= card
->csd
.tacc_ns
* mult
;
445 data
->timeout_clks
= card
->csd
.tacc_clks
* mult
;
448 * SD cards also have an upper limit on the timeout.
450 if (mmc_card_sd(card
)) {
451 unsigned int timeout_us
, limit_us
;
453 timeout_us
= data
->timeout_ns
/ 1000;
454 if (mmc_host_clk_rate(card
->host
))
455 timeout_us
+= data
->timeout_clks
* 1000 /
456 (mmc_host_clk_rate(card
->host
) / 1000);
458 if (data
->flags
& MMC_DATA_WRITE
)
460 * The limit is really 250 ms, but that is
461 * insufficient for some crappy cards.
468 * SDHC cards always use these fixed values.
470 if (timeout_us
> limit_us
|| mmc_card_blockaddr(card
)) {
471 data
->timeout_ns
= limit_us
* 1000;
472 data
->timeout_clks
= 0;
476 * Some cards need very high timeouts if driven in SPI mode.
477 * The worst observed timeout was 900ms after writing a
478 * continuous stream of data until the internal logic
481 if (mmc_host_is_spi(card
->host
)) {
482 if (data
->flags
& MMC_DATA_WRITE
) {
483 if (data
->timeout_ns
< 1000000000)
484 data
->timeout_ns
= 1000000000; /* 1s */
486 if (data
->timeout_ns
< 100000000)
487 data
->timeout_ns
= 100000000; /* 100ms */
491 EXPORT_SYMBOL(mmc_set_data_timeout
);
494 * mmc_align_data_size - pads a transfer size to a more optimal value
495 * @card: the MMC card associated with the data transfer
496 * @sz: original transfer size
498 * Pads the original data size with a number of extra bytes in
499 * order to avoid controller bugs and/or performance hits
500 * (e.g. some controllers revert to PIO for certain sizes).
502 * Returns the improved size, which might be unmodified.
504 * Note that this function is only relevant when issuing a
505 * single scatter gather entry.
507 unsigned int mmc_align_data_size(struct mmc_card
*card
, unsigned int sz
)
510 * FIXME: We don't have a system for the controller to tell
511 * the core about its problems yet, so for now we just 32-bit
514 sz
= ((sz
+ 3) / 4) * 4;
518 EXPORT_SYMBOL(mmc_align_data_size
);
521 * mmc_host_enable - enable a host.
522 * @host: mmc host to enable
524 * Hosts that support power saving can use the 'enable' and 'disable'
525 * methods to exit and enter power saving states. For more information
526 * see comments for struct mmc_host_ops.
528 int mmc_host_enable(struct mmc_host
*host
)
530 if (!(host
->caps
& MMC_CAP_DISABLE
))
533 if (host
->en_dis_recurs
)
536 if (host
->nesting_cnt
++)
539 cancel_delayed_work_sync(&host
->disable
);
544 if (host
->ops
->enable
) {
547 host
->en_dis_recurs
= 1;
548 err
= host
->ops
->enable(host
);
549 host
->en_dis_recurs
= 0;
552 pr_debug("%s: enable error %d\n",
553 mmc_hostname(host
), err
);
560 EXPORT_SYMBOL(mmc_host_enable
);
562 static int mmc_host_do_disable(struct mmc_host
*host
, int lazy
)
564 if (host
->ops
->disable
) {
567 host
->en_dis_recurs
= 1;
568 err
= host
->ops
->disable(host
, lazy
);
569 host
->en_dis_recurs
= 0;
572 pr_debug("%s: disable error %d\n",
573 mmc_hostname(host
), err
);
577 unsigned long delay
= msecs_to_jiffies(err
);
579 mmc_schedule_delayed_work(&host
->disable
, delay
);
587 * mmc_host_disable - disable a host.
588 * @host: mmc host to disable
590 * Hosts that support power saving can use the 'enable' and 'disable'
591 * methods to exit and enter power saving states. For more information
592 * see comments for struct mmc_host_ops.
594 int mmc_host_disable(struct mmc_host
*host
)
598 if (!(host
->caps
& MMC_CAP_DISABLE
))
601 if (host
->en_dis_recurs
)
604 if (--host
->nesting_cnt
)
610 err
= mmc_host_do_disable(host
, 0);
613 EXPORT_SYMBOL(mmc_host_disable
);
616 * __mmc_claim_host - exclusively claim a host
617 * @host: mmc host to claim
618 * @abort: whether or not the operation should be aborted
620 * Claim a host for a set of operations. If @abort is non null and
621 * dereference a non-zero value then this will return prematurely with
622 * that non-zero value without acquiring the lock. Returns zero
623 * with the lock held otherwise.
625 int __mmc_claim_host(struct mmc_host
*host
, atomic_t
*abort
)
627 DECLARE_WAITQUEUE(wait
, current
);
633 add_wait_queue(&host
->wq
, &wait
);
634 spin_lock_irqsave(&host
->lock
, flags
);
636 set_current_state(TASK_UNINTERRUPTIBLE
);
637 stop
= abort
? atomic_read(abort
) : 0;
638 if (stop
|| !host
->claimed
|| host
->claimer
== current
)
640 spin_unlock_irqrestore(&host
->lock
, flags
);
642 spin_lock_irqsave(&host
->lock
, flags
);
644 set_current_state(TASK_RUNNING
);
647 host
->claimer
= current
;
648 host
->claim_cnt
+= 1;
651 spin_unlock_irqrestore(&host
->lock
, flags
);
652 remove_wait_queue(&host
->wq
, &wait
);
654 mmc_host_enable(host
);
658 EXPORT_SYMBOL(__mmc_claim_host
);
661 * mmc_try_claim_host - try exclusively to claim a host
662 * @host: mmc host to claim
664 * Returns %1 if the host is claimed, %0 otherwise.
666 int mmc_try_claim_host(struct mmc_host
*host
)
668 int claimed_host
= 0;
671 spin_lock_irqsave(&host
->lock
, flags
);
672 if (!host
->claimed
|| host
->claimer
== current
) {
674 host
->claimer
= current
;
675 host
->claim_cnt
+= 1;
678 spin_unlock_irqrestore(&host
->lock
, flags
);
681 EXPORT_SYMBOL(mmc_try_claim_host
);
684 * mmc_do_release_host - release a claimed host
685 * @host: mmc host to release
687 * If you successfully claimed a host, this function will
690 void mmc_do_release_host(struct mmc_host
*host
)
694 spin_lock_irqsave(&host
->lock
, flags
);
695 if (--host
->claim_cnt
) {
696 /* Release for nested claim */
697 spin_unlock_irqrestore(&host
->lock
, flags
);
700 host
->claimer
= NULL
;
701 spin_unlock_irqrestore(&host
->lock
, flags
);
705 EXPORT_SYMBOL(mmc_do_release_host
);
707 void mmc_host_deeper_disable(struct work_struct
*work
)
709 struct mmc_host
*host
=
710 container_of(work
, struct mmc_host
, disable
.work
);
712 /* If the host is claimed then we do not want to disable it anymore */
713 if (!mmc_try_claim_host(host
))
715 mmc_host_do_disable(host
, 1);
716 mmc_do_release_host(host
);
720 * mmc_host_lazy_disable - lazily disable a host.
721 * @host: mmc host to disable
723 * Hosts that support power saving can use the 'enable' and 'disable'
724 * methods to exit and enter power saving states. For more information
725 * see comments for struct mmc_host_ops.
727 int mmc_host_lazy_disable(struct mmc_host
*host
)
729 if (!(host
->caps
& MMC_CAP_DISABLE
))
732 if (host
->en_dis_recurs
)
735 if (--host
->nesting_cnt
)
741 if (host
->disable_delay
) {
742 mmc_schedule_delayed_work(&host
->disable
,
743 msecs_to_jiffies(host
->disable_delay
));
746 return mmc_host_do_disable(host
, 1);
748 EXPORT_SYMBOL(mmc_host_lazy_disable
);
751 * mmc_release_host - release a host
752 * @host: mmc host to release
754 * Release a MMC host, allowing others to claim the host
755 * for their operations.
757 void mmc_release_host(struct mmc_host
*host
)
759 WARN_ON(!host
->claimed
);
761 mmc_host_lazy_disable(host
);
763 mmc_do_release_host(host
);
766 EXPORT_SYMBOL(mmc_release_host
);
769 * Internal function that does the actual ios call to the host driver,
770 * optionally printing some debug output.
772 static inline void mmc_set_ios(struct mmc_host
*host
)
774 struct mmc_ios
*ios
= &host
->ios
;
776 pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u "
777 "width %u timing %u\n",
778 mmc_hostname(host
), ios
->clock
, ios
->bus_mode
,
779 ios
->power_mode
, ios
->chip_select
, ios
->vdd
,
780 ios
->bus_width
, ios
->timing
);
783 mmc_set_ungated(host
);
784 host
->ops
->set_ios(host
, ios
);
788 * Control chip select pin on a host.
790 void mmc_set_chip_select(struct mmc_host
*host
, int mode
)
792 mmc_host_clk_hold(host
);
793 host
->ios
.chip_select
= mode
;
795 mmc_host_clk_release(host
);
799 * Sets the host clock to the highest possible frequency that
802 static void __mmc_set_clock(struct mmc_host
*host
, unsigned int hz
)
804 WARN_ON(hz
< host
->f_min
);
806 if (hz
> host
->f_max
)
809 host
->ios
.clock
= hz
;
813 void mmc_set_clock(struct mmc_host
*host
, unsigned int hz
)
815 mmc_host_clk_hold(host
);
816 __mmc_set_clock(host
, hz
);
817 mmc_host_clk_release(host
);
820 #ifdef CONFIG_MMC_CLKGATE
822 * This gates the clock by setting it to 0 Hz.
824 void mmc_gate_clock(struct mmc_host
*host
)
828 spin_lock_irqsave(&host
->clk_lock
, flags
);
829 host
->clk_old
= host
->ios
.clock
;
831 host
->clk_gated
= true;
832 spin_unlock_irqrestore(&host
->clk_lock
, flags
);
837 * This restores the clock from gating by using the cached
840 void mmc_ungate_clock(struct mmc_host
*host
)
843 * We should previously have gated the clock, so the clock shall
844 * be 0 here! The clock may however be 0 during initialization,
845 * when some request operations are performed before setting
846 * the frequency. When ungate is requested in that situation
847 * we just ignore the call.
850 BUG_ON(host
->ios
.clock
);
851 /* This call will also set host->clk_gated to false */
852 __mmc_set_clock(host
, host
->clk_old
);
856 void mmc_set_ungated(struct mmc_host
*host
)
861 * We've been given a new frequency while the clock is gated,
862 * so make sure we regard this as ungating it.
864 spin_lock_irqsave(&host
->clk_lock
, flags
);
865 host
->clk_gated
= false;
866 spin_unlock_irqrestore(&host
->clk_lock
, flags
);
870 void mmc_set_ungated(struct mmc_host
*host
)
876 * Change the bus mode (open drain/push-pull) of a host.
878 void mmc_set_bus_mode(struct mmc_host
*host
, unsigned int mode
)
880 mmc_host_clk_hold(host
);
881 host
->ios
.bus_mode
= mode
;
883 mmc_host_clk_release(host
);
887 * Change data bus width of a host.
889 void mmc_set_bus_width(struct mmc_host
*host
, unsigned int width
)
891 mmc_host_clk_hold(host
);
892 host
->ios
.bus_width
= width
;
894 mmc_host_clk_release(host
);
898 * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number
900 * @low_bits: prefer low bits in boundary cases
902 * This function returns the OCR bit number according to the provided @vdd
903 * value. If conversion is not possible a negative errno value returned.
905 * Depending on the @low_bits flag the function prefers low or high OCR bits
906 * on boundary voltages. For example,
907 * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33);
908 * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34);
910 * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21).
912 static int mmc_vdd_to_ocrbitnum(int vdd
, bool low_bits
)
914 const int max_bit
= ilog2(MMC_VDD_35_36
);
917 if (vdd
< 1650 || vdd
> 3600)
920 if (vdd
>= 1650 && vdd
<= 1950)
921 return ilog2(MMC_VDD_165_195
);
926 /* Base 2000 mV, step 100 mV, bit's base 8. */
927 bit
= (vdd
- 2000) / 100 + 8;
934 * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask
935 * @vdd_min: minimum voltage value (mV)
936 * @vdd_max: maximum voltage value (mV)
938 * This function returns the OCR mask bits according to the provided @vdd_min
939 * and @vdd_max values. If conversion is not possible the function returns 0.
941 * Notes wrt boundary cases:
942 * This function sets the OCR bits for all boundary voltages, for example
943 * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 |
944 * MMC_VDD_34_35 mask.
946 u32
mmc_vddrange_to_ocrmask(int vdd_min
, int vdd_max
)
950 if (vdd_max
< vdd_min
)
953 /* Prefer high bits for the boundary vdd_max values. */
954 vdd_max
= mmc_vdd_to_ocrbitnum(vdd_max
, false);
958 /* Prefer low bits for the boundary vdd_min values. */
959 vdd_min
= mmc_vdd_to_ocrbitnum(vdd_min
, true);
963 /* Fill the mask, from max bit to min bit. */
964 while (vdd_max
>= vdd_min
)
965 mask
|= 1 << vdd_max
--;
969 EXPORT_SYMBOL(mmc_vddrange_to_ocrmask
);
971 #ifdef CONFIG_REGULATOR
974 * mmc_regulator_get_ocrmask - return mask of supported voltages
975 * @supply: regulator to use
977 * This returns either a negative errno, or a mask of voltages that
978 * can be provided to MMC/SD/SDIO devices using the specified voltage
979 * regulator. This would normally be called before registering the
982 int mmc_regulator_get_ocrmask(struct regulator
*supply
)
988 count
= regulator_count_voltages(supply
);
992 for (i
= 0; i
< count
; i
++) {
996 vdd_uV
= regulator_list_voltage(supply
, i
);
1000 vdd_mV
= vdd_uV
/ 1000;
1001 result
|= mmc_vddrange_to_ocrmask(vdd_mV
, vdd_mV
);
1006 EXPORT_SYMBOL(mmc_regulator_get_ocrmask
);
1009 * mmc_regulator_set_ocr - set regulator to match host->ios voltage
1010 * @mmc: the host to regulate
1011 * @supply: regulator to use
1012 * @vdd_bit: zero for power off, else a bit number (host->ios.vdd)
1014 * Returns zero on success, else negative errno.
1016 * MMC host drivers may use this to enable or disable a regulator using
1017 * a particular supply voltage. This would normally be called from the
1020 int mmc_regulator_set_ocr(struct mmc_host
*mmc
,
1021 struct regulator
*supply
,
1022 unsigned short vdd_bit
)
1031 /* REVISIT mmc_vddrange_to_ocrmask() may have set some
1032 * bits this regulator doesn't quite support ... don't
1033 * be too picky, most cards and regulators are OK with
1034 * a 0.1V range goof (it's a small error percentage).
1036 tmp
= vdd_bit
- ilog2(MMC_VDD_165_195
);
1038 min_uV
= 1650 * 1000;
1039 max_uV
= 1950 * 1000;
1041 min_uV
= 1900 * 1000 + tmp
* 100 * 1000;
1042 max_uV
= min_uV
+ 100 * 1000;
1045 /* avoid needless changes to this voltage; the regulator
1046 * might not allow this operation
1048 voltage
= regulator_get_voltage(supply
);
1051 else if (voltage
< min_uV
|| voltage
> max_uV
)
1052 result
= regulator_set_voltage(supply
, min_uV
, max_uV
);
1056 if (result
== 0 && !mmc
->regulator_enabled
) {
1057 result
= regulator_enable(supply
);
1059 mmc
->regulator_enabled
= true;
1061 } else if (mmc
->regulator_enabled
) {
1062 result
= regulator_disable(supply
);
1064 mmc
->regulator_enabled
= false;
1068 dev_err(mmc_dev(mmc
),
1069 "could not set regulator OCR (%d)\n", result
);
1072 EXPORT_SYMBOL(mmc_regulator_set_ocr
);
1074 #endif /* CONFIG_REGULATOR */
1077 * Mask off any voltages we don't support and select
1078 * the lowest voltage
1080 u32
mmc_select_voltage(struct mmc_host
*host
, u32 ocr
)
1084 ocr
&= host
->ocr_avail
;
1092 mmc_host_clk_hold(host
);
1093 host
->ios
.vdd
= bit
;
1095 mmc_host_clk_release(host
);
1097 pr_warning("%s: host doesn't support card's voltages\n",
1098 mmc_hostname(host
));
1105 int mmc_set_signal_voltage(struct mmc_host
*host
, int signal_voltage
, bool cmd11
)
1107 struct mmc_command cmd
= {0};
1113 * Send CMD11 only if the request is to switch the card to
1116 if ((signal_voltage
!= MMC_SIGNAL_VOLTAGE_330
) && cmd11
) {
1117 cmd
.opcode
= SD_SWITCH_VOLTAGE
;
1119 cmd
.flags
= MMC_RSP_R1
| MMC_CMD_AC
;
1121 err
= mmc_wait_for_cmd(host
, &cmd
, 0);
1125 if (!mmc_host_is_spi(host
) && (cmd
.resp
[0] & R1_ERROR
))
1129 host
->ios
.signal_voltage
= signal_voltage
;
1131 if (host
->ops
->start_signal_voltage_switch
)
1132 err
= host
->ops
->start_signal_voltage_switch(host
, &host
->ios
);
1138 * Select timing parameters for host.
1140 void mmc_set_timing(struct mmc_host
*host
, unsigned int timing
)
1142 mmc_host_clk_hold(host
);
1143 host
->ios
.timing
= timing
;
1145 mmc_host_clk_release(host
);
1149 * Select appropriate driver type for host.
1151 void mmc_set_driver_type(struct mmc_host
*host
, unsigned int drv_type
)
1153 mmc_host_clk_hold(host
);
1154 host
->ios
.drv_type
= drv_type
;
1156 mmc_host_clk_release(host
);
1160 * Apply power to the MMC stack. This is a two-stage process.
1161 * First, we enable power to the card without the clock running.
1162 * We then wait a bit for the power to stabilise. Finally,
1163 * enable the bus drivers and clock to the card.
1165 * We must _NOT_ enable the clock prior to power stablising.
1167 * If a host does all the power sequencing itself, ignore the
1168 * initial MMC_POWER_UP stage.
1170 static void mmc_power_up(struct mmc_host
*host
)
1174 mmc_host_clk_hold(host
);
1176 /* If ocr is set, we use it */
1178 bit
= ffs(host
->ocr
) - 1;
1180 bit
= fls(host
->ocr_avail
) - 1;
1182 host
->ios
.vdd
= bit
;
1183 if (mmc_host_is_spi(host
))
1184 host
->ios
.chip_select
= MMC_CS_HIGH
;
1186 host
->ios
.chip_select
= MMC_CS_DONTCARE
;
1187 host
->ios
.bus_mode
= MMC_BUSMODE_PUSHPULL
;
1188 host
->ios
.power_mode
= MMC_POWER_UP
;
1189 host
->ios
.bus_width
= MMC_BUS_WIDTH_1
;
1190 host
->ios
.timing
= MMC_TIMING_LEGACY
;
1194 * This delay should be sufficient to allow the power supply
1195 * to reach the minimum voltage.
1199 host
->ios
.clock
= host
->f_init
;
1201 host
->ios
.power_mode
= MMC_POWER_ON
;
1205 * This delay must be at least 74 clock sizes, or 1 ms, or the
1206 * time required to reach a stable voltage.
1210 mmc_host_clk_release(host
);
1213 void mmc_power_off(struct mmc_host
*host
)
1215 mmc_host_clk_hold(host
);
1217 host
->ios
.clock
= 0;
1221 * Reset ocr mask to be the highest possible voltage supported for
1222 * this mmc host. This value will be used at next power up.
1224 host
->ocr
= 1 << (fls(host
->ocr_avail
) - 1);
1226 if (!mmc_host_is_spi(host
)) {
1227 host
->ios
.bus_mode
= MMC_BUSMODE_OPENDRAIN
;
1228 host
->ios
.chip_select
= MMC_CS_DONTCARE
;
1230 host
->ios
.power_mode
= MMC_POWER_OFF
;
1231 host
->ios
.bus_width
= MMC_BUS_WIDTH_1
;
1232 host
->ios
.timing
= MMC_TIMING_LEGACY
;
1236 * Some configurations, such as the 802.11 SDIO card in the OLPC
1237 * XO-1.5, require a short delay after poweroff before the card
1238 * can be successfully turned on again.
1242 mmc_host_clk_release(host
);
1246 * Cleanup when the last reference to the bus operator is dropped.
1248 static void __mmc_release_bus(struct mmc_host
*host
)
1251 BUG_ON(host
->bus_refs
);
1252 BUG_ON(!host
->bus_dead
);
1254 host
->bus_ops
= NULL
;
1258 * Increase reference count of bus operator
1260 static inline void mmc_bus_get(struct mmc_host
*host
)
1262 unsigned long flags
;
1264 spin_lock_irqsave(&host
->lock
, flags
);
1266 spin_unlock_irqrestore(&host
->lock
, flags
);
1270 * Decrease reference count of bus operator and free it if
1271 * it is the last reference.
1273 static inline void mmc_bus_put(struct mmc_host
*host
)
1275 unsigned long flags
;
1277 spin_lock_irqsave(&host
->lock
, flags
);
1279 if ((host
->bus_refs
== 0) && host
->bus_ops
)
1280 __mmc_release_bus(host
);
1281 spin_unlock_irqrestore(&host
->lock
, flags
);
1285 * Assign a mmc bus handler to a host. Only one bus handler may control a
1286 * host at any given time.
1288 void mmc_attach_bus(struct mmc_host
*host
, const struct mmc_bus_ops
*ops
)
1290 unsigned long flags
;
1295 WARN_ON(!host
->claimed
);
1297 spin_lock_irqsave(&host
->lock
, flags
);
1299 BUG_ON(host
->bus_ops
);
1300 BUG_ON(host
->bus_refs
);
1302 host
->bus_ops
= ops
;
1306 spin_unlock_irqrestore(&host
->lock
, flags
);
1310 * Remove the current bus handler from a host.
1312 void mmc_detach_bus(struct mmc_host
*host
)
1314 unsigned long flags
;
1318 WARN_ON(!host
->claimed
);
1319 WARN_ON(!host
->bus_ops
);
1321 spin_lock_irqsave(&host
->lock
, flags
);
1325 spin_unlock_irqrestore(&host
->lock
, flags
);
1331 * mmc_detect_change - process change of state on a MMC socket
1332 * @host: host which changed state.
1333 * @delay: optional delay to wait before detection (jiffies)
1335 * MMC drivers should call this when they detect a card has been
1336 * inserted or removed. The MMC layer will confirm that any
1337 * present card is still functional, and initialize any newly
1340 void mmc_detect_change(struct mmc_host
*host
, unsigned long delay
)
1342 #ifdef CONFIG_MMC_DEBUG
1343 unsigned long flags
;
1344 spin_lock_irqsave(&host
->lock
, flags
);
1345 WARN_ON(host
->removed
);
1346 spin_unlock_irqrestore(&host
->lock
, flags
);
1349 mmc_schedule_delayed_work(&host
->detect
, delay
);
1352 EXPORT_SYMBOL(mmc_detect_change
);
1354 void mmc_init_erase(struct mmc_card
*card
)
1358 if (is_power_of_2(card
->erase_size
))
1359 card
->erase_shift
= ffs(card
->erase_size
) - 1;
1361 card
->erase_shift
= 0;
1364 * It is possible to erase an arbitrarily large area of an SD or MMC
1365 * card. That is not desirable because it can take a long time
1366 * (minutes) potentially delaying more important I/O, and also the
1367 * timeout calculations become increasingly hugely over-estimated.
1368 * Consequently, 'pref_erase' is defined as a guide to limit erases
1369 * to that size and alignment.
1371 * For SD cards that define Allocation Unit size, limit erases to one
1372 * Allocation Unit at a time. For MMC cards that define High Capacity
1373 * Erase Size, whether it is switched on or not, limit to that size.
1374 * Otherwise just have a stab at a good value. For modern cards it
1375 * will end up being 4MiB. Note that if the value is too small, it
1376 * can end up taking longer to erase.
1378 if (mmc_card_sd(card
) && card
->ssr
.au
) {
1379 card
->pref_erase
= card
->ssr
.au
;
1380 card
->erase_shift
= ffs(card
->ssr
.au
) - 1;
1381 } else if (card
->ext_csd
.hc_erase_size
) {
1382 card
->pref_erase
= card
->ext_csd
.hc_erase_size
;
1384 sz
= (card
->csd
.capacity
<< (card
->csd
.read_blkbits
- 9)) >> 11;
1386 card
->pref_erase
= 512 * 1024 / 512;
1388 card
->pref_erase
= 1024 * 1024 / 512;
1390 card
->pref_erase
= 2 * 1024 * 1024 / 512;
1392 card
->pref_erase
= 4 * 1024 * 1024 / 512;
1393 if (card
->pref_erase
< card
->erase_size
)
1394 card
->pref_erase
= card
->erase_size
;
1396 sz
= card
->pref_erase
% card
->erase_size
;
1398 card
->pref_erase
+= card
->erase_size
- sz
;
1403 static unsigned int mmc_mmc_erase_timeout(struct mmc_card
*card
,
1404 unsigned int arg
, unsigned int qty
)
1406 unsigned int erase_timeout
;
1408 if (card
->ext_csd
.erase_group_def
& 1) {
1409 /* High Capacity Erase Group Size uses HC timeouts */
1410 if (arg
== MMC_TRIM_ARG
)
1411 erase_timeout
= card
->ext_csd
.trim_timeout
;
1413 erase_timeout
= card
->ext_csd
.hc_erase_timeout
;
1415 /* CSD Erase Group Size uses write timeout */
1416 unsigned int mult
= (10 << card
->csd
.r2w_factor
);
1417 unsigned int timeout_clks
= card
->csd
.tacc_clks
* mult
;
1418 unsigned int timeout_us
;
1420 /* Avoid overflow: e.g. tacc_ns=80000000 mult=1280 */
1421 if (card
->csd
.tacc_ns
< 1000000)
1422 timeout_us
= (card
->csd
.tacc_ns
* mult
) / 1000;
1424 timeout_us
= (card
->csd
.tacc_ns
/ 1000) * mult
;
1427 * ios.clock is only a target. The real clock rate might be
1428 * less but not that much less, so fudge it by multiplying by 2.
1431 timeout_us
+= (timeout_clks
* 1000) /
1432 (mmc_host_clk_rate(card
->host
) / 1000);
1434 erase_timeout
= timeout_us
/ 1000;
1437 * Theoretically, the calculation could underflow so round up
1438 * to 1ms in that case.
1444 /* Multiplier for secure operations */
1445 if (arg
& MMC_SECURE_ARGS
) {
1446 if (arg
== MMC_SECURE_ERASE_ARG
)
1447 erase_timeout
*= card
->ext_csd
.sec_erase_mult
;
1449 erase_timeout
*= card
->ext_csd
.sec_trim_mult
;
1452 erase_timeout
*= qty
;
1455 * Ensure at least a 1 second timeout for SPI as per
1456 * 'mmc_set_data_timeout()'
1458 if (mmc_host_is_spi(card
->host
) && erase_timeout
< 1000)
1459 erase_timeout
= 1000;
1461 return erase_timeout
;
1464 static unsigned int mmc_sd_erase_timeout(struct mmc_card
*card
,
1468 unsigned int erase_timeout
;
1470 if (card
->ssr
.erase_timeout
) {
1471 /* Erase timeout specified in SD Status Register (SSR) */
1472 erase_timeout
= card
->ssr
.erase_timeout
* qty
+
1473 card
->ssr
.erase_offset
;
1476 * Erase timeout not specified in SD Status Register (SSR) so
1477 * use 250ms per write block.
1479 erase_timeout
= 250 * qty
;
1482 /* Must not be less than 1 second */
1483 if (erase_timeout
< 1000)
1484 erase_timeout
= 1000;
1486 return erase_timeout
;
1489 static unsigned int mmc_erase_timeout(struct mmc_card
*card
,
1493 if (mmc_card_sd(card
))
1494 return mmc_sd_erase_timeout(card
, arg
, qty
);
1496 return mmc_mmc_erase_timeout(card
, arg
, qty
);
1499 static int mmc_do_erase(struct mmc_card
*card
, unsigned int from
,
1500 unsigned int to
, unsigned int arg
)
1502 struct mmc_command cmd
= {0};
1503 unsigned int qty
= 0;
1507 * qty is used to calculate the erase timeout which depends on how many
1508 * erase groups (or allocation units in SD terminology) are affected.
1509 * We count erasing part of an erase group as one erase group.
1510 * For SD, the allocation units are always a power of 2. For MMC, the
1511 * erase group size is almost certainly also power of 2, but it does not
1512 * seem to insist on that in the JEDEC standard, so we fall back to
1513 * division in that case. SD may not specify an allocation unit size,
1514 * in which case the timeout is based on the number of write blocks.
1516 * Note that the timeout for secure trim 2 will only be correct if the
1517 * number of erase groups specified is the same as the total of all
1518 * preceding secure trim 1 commands. Since the power may have been
1519 * lost since the secure trim 1 commands occurred, it is generally
1520 * impossible to calculate the secure trim 2 timeout correctly.
1522 if (card
->erase_shift
)
1523 qty
+= ((to
>> card
->erase_shift
) -
1524 (from
>> card
->erase_shift
)) + 1;
1525 else if (mmc_card_sd(card
))
1526 qty
+= to
- from
+ 1;
1528 qty
+= ((to
/ card
->erase_size
) -
1529 (from
/ card
->erase_size
)) + 1;
1531 if (!mmc_card_blockaddr(card
)) {
1536 if (mmc_card_sd(card
))
1537 cmd
.opcode
= SD_ERASE_WR_BLK_START
;
1539 cmd
.opcode
= MMC_ERASE_GROUP_START
;
1541 cmd
.flags
= MMC_RSP_SPI_R1
| MMC_RSP_R1
| MMC_CMD_AC
;
1542 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 0);
1544 pr_err("mmc_erase: group start error %d, "
1545 "status %#x\n", err
, cmd
.resp
[0]);
1550 memset(&cmd
, 0, sizeof(struct mmc_command
));
1551 if (mmc_card_sd(card
))
1552 cmd
.opcode
= SD_ERASE_WR_BLK_END
;
1554 cmd
.opcode
= MMC_ERASE_GROUP_END
;
1556 cmd
.flags
= MMC_RSP_SPI_R1
| MMC_RSP_R1
| MMC_CMD_AC
;
1557 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 0);
1559 pr_err("mmc_erase: group end error %d, status %#x\n",
1565 memset(&cmd
, 0, sizeof(struct mmc_command
));
1566 cmd
.opcode
= MMC_ERASE
;
1568 cmd
.flags
= MMC_RSP_SPI_R1B
| MMC_RSP_R1B
| MMC_CMD_AC
;
1569 cmd
.cmd_timeout_ms
= mmc_erase_timeout(card
, arg
, qty
);
1570 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 0);
1572 pr_err("mmc_erase: erase error %d, status %#x\n",
1578 if (mmc_host_is_spi(card
->host
))
1582 memset(&cmd
, 0, sizeof(struct mmc_command
));
1583 cmd
.opcode
= MMC_SEND_STATUS
;
1584 cmd
.arg
= card
->rca
<< 16;
1585 cmd
.flags
= MMC_RSP_R1
| MMC_CMD_AC
;
1586 /* Do not retry else we can't see errors */
1587 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 0);
1588 if (err
|| (cmd
.resp
[0] & 0xFDF92000)) {
1589 pr_err("error %d requesting status %#x\n",
1594 } while (!(cmd
.resp
[0] & R1_READY_FOR_DATA
) ||
1595 R1_CURRENT_STATE(cmd
.resp
[0]) == R1_STATE_PRG
);
1601 * mmc_erase - erase sectors.
1602 * @card: card to erase
1603 * @from: first sector to erase
1604 * @nr: number of sectors to erase
1605 * @arg: erase command argument (SD supports only %MMC_ERASE_ARG)
1607 * Caller must claim host before calling this function.
1609 int mmc_erase(struct mmc_card
*card
, unsigned int from
, unsigned int nr
,
1612 unsigned int rem
, to
= from
+ nr
;
1614 if (!(card
->host
->caps
& MMC_CAP_ERASE
) ||
1615 !(card
->csd
.cmdclass
& CCC_ERASE
))
1618 if (!card
->erase_size
)
1621 if (mmc_card_sd(card
) && arg
!= MMC_ERASE_ARG
)
1624 if ((arg
& MMC_SECURE_ARGS
) &&
1625 !(card
->ext_csd
.sec_feature_support
& EXT_CSD_SEC_ER_EN
))
1628 if ((arg
& MMC_TRIM_ARGS
) &&
1629 !(card
->ext_csd
.sec_feature_support
& EXT_CSD_SEC_GB_CL_EN
))
1632 if (arg
== MMC_SECURE_ERASE_ARG
) {
1633 if (from
% card
->erase_size
|| nr
% card
->erase_size
)
1637 if (arg
== MMC_ERASE_ARG
) {
1638 rem
= from
% card
->erase_size
;
1640 rem
= card
->erase_size
- rem
;
1647 rem
= nr
% card
->erase_size
;
1660 /* 'from' and 'to' are inclusive */
1663 return mmc_do_erase(card
, from
, to
, arg
);
1665 EXPORT_SYMBOL(mmc_erase
);
1667 int mmc_can_erase(struct mmc_card
*card
)
1669 if ((card
->host
->caps
& MMC_CAP_ERASE
) &&
1670 (card
->csd
.cmdclass
& CCC_ERASE
) && card
->erase_size
)
1674 EXPORT_SYMBOL(mmc_can_erase
);
1676 int mmc_can_trim(struct mmc_card
*card
)
1678 if (card
->ext_csd
.sec_feature_support
& EXT_CSD_SEC_GB_CL_EN
)
1682 EXPORT_SYMBOL(mmc_can_trim
);
1684 int mmc_can_secure_erase_trim(struct mmc_card
*card
)
1686 if (card
->ext_csd
.sec_feature_support
& EXT_CSD_SEC_ER_EN
)
1690 EXPORT_SYMBOL(mmc_can_secure_erase_trim
);
1692 int mmc_erase_group_aligned(struct mmc_card
*card
, unsigned int from
,
1695 if (!card
->erase_size
)
1697 if (from
% card
->erase_size
|| nr
% card
->erase_size
)
1701 EXPORT_SYMBOL(mmc_erase_group_aligned
);
1703 static unsigned int mmc_do_calc_max_discard(struct mmc_card
*card
,
1706 struct mmc_host
*host
= card
->host
;
1707 unsigned int max_discard
, x
, y
, qty
= 0, max_qty
, timeout
;
1708 unsigned int last_timeout
= 0;
1710 if (card
->erase_shift
)
1711 max_qty
= UINT_MAX
>> card
->erase_shift
;
1712 else if (mmc_card_sd(card
))
1715 max_qty
= UINT_MAX
/ card
->erase_size
;
1717 /* Find the largest qty with an OK timeout */
1720 for (x
= 1; x
&& x
<= max_qty
&& max_qty
- x
>= qty
; x
<<= 1) {
1721 timeout
= mmc_erase_timeout(card
, arg
, qty
+ x
);
1722 if (timeout
> host
->max_discard_to
)
1724 if (timeout
< last_timeout
)
1726 last_timeout
= timeout
;
1738 /* Convert qty to sectors */
1739 if (card
->erase_shift
)
1740 max_discard
= --qty
<< card
->erase_shift
;
1741 else if (mmc_card_sd(card
))
1744 max_discard
= --qty
* card
->erase_size
;
1749 unsigned int mmc_calc_max_discard(struct mmc_card
*card
)
1751 struct mmc_host
*host
= card
->host
;
1752 unsigned int max_discard
, max_trim
;
1754 if (!host
->max_discard_to
)
1758 * Without erase_group_def set, MMC erase timeout depends on clock
1759 * frequence which can change. In that case, the best choice is
1760 * just the preferred erase size.
1762 if (mmc_card_mmc(card
) && !(card
->ext_csd
.erase_group_def
& 1))
1763 return card
->pref_erase
;
1765 max_discard
= mmc_do_calc_max_discard(card
, MMC_ERASE_ARG
);
1766 if (mmc_can_trim(card
)) {
1767 max_trim
= mmc_do_calc_max_discard(card
, MMC_TRIM_ARG
);
1768 if (max_trim
< max_discard
)
1769 max_discard
= max_trim
;
1770 } else if (max_discard
< card
->erase_size
) {
1773 pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n",
1774 mmc_hostname(host
), max_discard
, host
->max_discard_to
);
1777 EXPORT_SYMBOL(mmc_calc_max_discard
);
1779 int mmc_set_blocklen(struct mmc_card
*card
, unsigned int blocklen
)
1781 struct mmc_command cmd
= {0};
1783 if (mmc_card_blockaddr(card
) || mmc_card_ddr_mode(card
))
1786 cmd
.opcode
= MMC_SET_BLOCKLEN
;
1788 cmd
.flags
= MMC_RSP_SPI_R1
| MMC_RSP_R1
| MMC_CMD_AC
;
1789 return mmc_wait_for_cmd(card
->host
, &cmd
, 5);
1791 EXPORT_SYMBOL(mmc_set_blocklen
);
1793 static void mmc_hw_reset_for_init(struct mmc_host
*host
)
1795 if (!(host
->caps
& MMC_CAP_HW_RESET
) || !host
->ops
->hw_reset
)
1797 mmc_host_clk_hold(host
);
1798 host
->ops
->hw_reset(host
);
1799 mmc_host_clk_release(host
);
1802 int mmc_can_reset(struct mmc_card
*card
)
1806 if (!mmc_card_mmc(card
))
1808 rst_n_function
= card
->ext_csd
.rst_n_function
;
1809 if ((rst_n_function
& EXT_CSD_RST_N_EN_MASK
) != EXT_CSD_RST_N_ENABLED
)
1813 EXPORT_SYMBOL(mmc_can_reset
);
1815 static int mmc_do_hw_reset(struct mmc_host
*host
, int check
)
1817 struct mmc_card
*card
= host
->card
;
1819 if (!host
->bus_ops
->power_restore
)
1822 if (!(host
->caps
& MMC_CAP_HW_RESET
) || !host
->ops
->hw_reset
)
1828 if (!mmc_can_reset(card
))
1831 mmc_host_clk_hold(host
);
1832 mmc_set_clock(host
, host
->f_init
);
1834 host
->ops
->hw_reset(host
);
1836 /* If the reset has happened, then a status command will fail */
1838 struct mmc_command cmd
= {0};
1841 cmd
.opcode
= MMC_SEND_STATUS
;
1842 if (!mmc_host_is_spi(card
->host
))
1843 cmd
.arg
= card
->rca
<< 16;
1844 cmd
.flags
= MMC_RSP_SPI_R2
| MMC_RSP_R1
| MMC_CMD_AC
;
1845 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 0);
1847 mmc_host_clk_release(host
);
1852 host
->card
->state
&= ~(MMC_STATE_HIGHSPEED
| MMC_STATE_HIGHSPEED_DDR
);
1853 if (mmc_host_is_spi(host
)) {
1854 host
->ios
.chip_select
= MMC_CS_HIGH
;
1855 host
->ios
.bus_mode
= MMC_BUSMODE_PUSHPULL
;
1857 host
->ios
.chip_select
= MMC_CS_DONTCARE
;
1858 host
->ios
.bus_mode
= MMC_BUSMODE_OPENDRAIN
;
1860 host
->ios
.bus_width
= MMC_BUS_WIDTH_1
;
1861 host
->ios
.timing
= MMC_TIMING_LEGACY
;
1864 mmc_host_clk_release(host
);
1866 return host
->bus_ops
->power_restore(host
);
1869 int mmc_hw_reset(struct mmc_host
*host
)
1871 return mmc_do_hw_reset(host
, 0);
1873 EXPORT_SYMBOL(mmc_hw_reset
);
1875 int mmc_hw_reset_check(struct mmc_host
*host
)
1877 return mmc_do_hw_reset(host
, 1);
1879 EXPORT_SYMBOL(mmc_hw_reset_check
);
1881 static int mmc_rescan_try_freq(struct mmc_host
*host
, unsigned freq
)
1883 host
->f_init
= freq
;
1885 #ifdef CONFIG_MMC_DEBUG
1886 pr_info("%s: %s: trying to init card at %u Hz\n",
1887 mmc_hostname(host
), __func__
, host
->f_init
);
1892 * Some eMMCs (with VCCQ always on) may not be reset after power up, so
1893 * do a hardware reset if possible.
1895 mmc_hw_reset_for_init(host
);
1898 * sdio_reset sends CMD52 to reset card. Since we do not know
1899 * if the card is being re-initialized, just send it. CMD52
1900 * should be ignored by SD/eMMC cards.
1905 mmc_send_if_cond(host
, host
->ocr_avail
);
1907 /* Order's important: probe SDIO, then SD, then MMC */
1908 if (!mmc_attach_sdio(host
))
1910 if (!mmc_attach_sd(host
))
1912 if (!mmc_attach_mmc(host
))
1915 mmc_power_off(host
);
1919 void mmc_rescan(struct work_struct
*work
)
1921 static const unsigned freqs
[] = { 400000, 300000, 200000, 100000 };
1922 struct mmc_host
*host
=
1923 container_of(work
, struct mmc_host
, detect
.work
);
1926 if (host
->rescan_disable
)
1932 * if there is a _removable_ card registered, check whether it is
1935 if (host
->bus_ops
&& host
->bus_ops
->detect
&& !host
->bus_dead
1936 && !(host
->caps
& MMC_CAP_NONREMOVABLE
))
1937 host
->bus_ops
->detect(host
);
1940 * Let mmc_bus_put() free the bus/bus_ops if we've found that
1941 * the card is no longer present.
1946 /* if there still is a card present, stop here */
1947 if (host
->bus_ops
!= NULL
) {
1953 * Only we can add a new handler, so it's safe to
1954 * release the lock here.
1958 if (host
->ops
->get_cd
&& host
->ops
->get_cd(host
) == 0)
1961 mmc_claim_host(host
);
1962 for (i
= 0; i
< ARRAY_SIZE(freqs
); i
++) {
1963 if (!mmc_rescan_try_freq(host
, max(freqs
[i
], host
->f_min
)))
1965 if (freqs
[i
] <= host
->f_min
)
1968 mmc_release_host(host
);
1971 if (host
->caps
& MMC_CAP_NEEDS_POLL
)
1972 mmc_schedule_delayed_work(&host
->detect
, HZ
);
1975 void mmc_start_host(struct mmc_host
*host
)
1977 mmc_power_off(host
);
1978 mmc_detect_change(host
, 0);
1981 void mmc_stop_host(struct mmc_host
*host
)
1983 #ifdef CONFIG_MMC_DEBUG
1984 unsigned long flags
;
1985 spin_lock_irqsave(&host
->lock
, flags
);
1987 spin_unlock_irqrestore(&host
->lock
, flags
);
1990 if (host
->caps
& MMC_CAP_DISABLE
)
1991 cancel_delayed_work(&host
->disable
);
1992 cancel_delayed_work_sync(&host
->detect
);
1993 mmc_flush_scheduled_work();
1995 /* clear pm flags now and let card drivers set them as needed */
1999 if (host
->bus_ops
&& !host
->bus_dead
) {
2000 if (host
->bus_ops
->remove
)
2001 host
->bus_ops
->remove(host
);
2003 mmc_claim_host(host
);
2004 mmc_detach_bus(host
);
2005 mmc_power_off(host
);
2006 mmc_release_host(host
);
2014 mmc_power_off(host
);
2017 int mmc_power_save_host(struct mmc_host
*host
)
2021 #ifdef CONFIG_MMC_DEBUG
2022 pr_info("%s: %s: powering down\n", mmc_hostname(host
), __func__
);
2027 if (!host
->bus_ops
|| host
->bus_dead
|| !host
->bus_ops
->power_restore
) {
2032 if (host
->bus_ops
->power_save
)
2033 ret
= host
->bus_ops
->power_save(host
);
2037 mmc_power_off(host
);
2041 EXPORT_SYMBOL(mmc_power_save_host
);
2043 int mmc_power_restore_host(struct mmc_host
*host
)
2047 #ifdef CONFIG_MMC_DEBUG
2048 pr_info("%s: %s: powering up\n", mmc_hostname(host
), __func__
);
2053 if (!host
->bus_ops
|| host
->bus_dead
|| !host
->bus_ops
->power_restore
) {
2059 ret
= host
->bus_ops
->power_restore(host
);
2065 EXPORT_SYMBOL(mmc_power_restore_host
);
2067 int mmc_card_awake(struct mmc_host
*host
)
2073 if (host
->bus_ops
&& !host
->bus_dead
&& host
->bus_ops
->awake
)
2074 err
= host
->bus_ops
->awake(host
);
2080 EXPORT_SYMBOL(mmc_card_awake
);
2082 int mmc_card_sleep(struct mmc_host
*host
)
2088 if (host
->bus_ops
&& !host
->bus_dead
&& host
->bus_ops
->awake
)
2089 err
= host
->bus_ops
->sleep(host
);
2095 EXPORT_SYMBOL(mmc_card_sleep
);
2097 int mmc_card_can_sleep(struct mmc_host
*host
)
2099 struct mmc_card
*card
= host
->card
;
2101 if (card
&& mmc_card_mmc(card
) && card
->ext_csd
.rev
>= 3)
2105 EXPORT_SYMBOL(mmc_card_can_sleep
);
2110 * mmc_suspend_host - suspend a host
2113 int mmc_suspend_host(struct mmc_host
*host
)
2117 if (host
->caps
& MMC_CAP_DISABLE
)
2118 cancel_delayed_work(&host
->disable
);
2119 cancel_delayed_work(&host
->detect
);
2120 mmc_flush_scheduled_work();
2123 if (host
->bus_ops
&& !host
->bus_dead
) {
2124 if (host
->bus_ops
->suspend
)
2125 err
= host
->bus_ops
->suspend(host
);
2126 if (err
== -ENOSYS
|| !host
->bus_ops
->resume
) {
2128 * We simply "remove" the card in this case.
2129 * It will be redetected on resume.
2131 if (host
->bus_ops
->remove
)
2132 host
->bus_ops
->remove(host
);
2133 mmc_claim_host(host
);
2134 mmc_detach_bus(host
);
2135 mmc_power_off(host
);
2136 mmc_release_host(host
);
2143 if (!err
&& !mmc_card_keep_power(host
))
2144 mmc_power_off(host
);
2149 EXPORT_SYMBOL(mmc_suspend_host
);
2152 * mmc_resume_host - resume a previously suspended host
2155 int mmc_resume_host(struct mmc_host
*host
)
2160 if (host
->bus_ops
&& !host
->bus_dead
) {
2161 if (!mmc_card_keep_power(host
)) {
2163 mmc_select_voltage(host
, host
->ocr
);
2165 * Tell runtime PM core we just powered up the card,
2166 * since it still believes the card is powered off.
2167 * Note that currently runtime PM is only enabled
2168 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
2170 if (mmc_card_sdio(host
->card
) &&
2171 (host
->caps
& MMC_CAP_POWER_OFF_CARD
)) {
2172 pm_runtime_disable(&host
->card
->dev
);
2173 pm_runtime_set_active(&host
->card
->dev
);
2174 pm_runtime_enable(&host
->card
->dev
);
2177 BUG_ON(!host
->bus_ops
->resume
);
2178 err
= host
->bus_ops
->resume(host
);
2180 pr_warning("%s: error %d during resume "
2181 "(card was removed?)\n",
2182 mmc_hostname(host
), err
);
2186 host
->pm_flags
&= ~MMC_PM_KEEP_POWER
;
2191 EXPORT_SYMBOL(mmc_resume_host
);
2193 /* Do the card removal on suspend if card is assumed removeable
2194 * Do that in pm notifier while userspace isn't yet frozen, so we will be able
2197 int mmc_pm_notify(struct notifier_block
*notify_block
,
2198 unsigned long mode
, void *unused
)
2200 struct mmc_host
*host
= container_of(
2201 notify_block
, struct mmc_host
, pm_notify
);
2202 unsigned long flags
;
2206 case PM_HIBERNATION_PREPARE
:
2207 case PM_SUSPEND_PREPARE
:
2209 spin_lock_irqsave(&host
->lock
, flags
);
2210 host
->rescan_disable
= 1;
2211 spin_unlock_irqrestore(&host
->lock
, flags
);
2212 cancel_delayed_work_sync(&host
->detect
);
2214 if (!host
->bus_ops
|| host
->bus_ops
->suspend
)
2217 mmc_claim_host(host
);
2219 if (host
->bus_ops
->remove
)
2220 host
->bus_ops
->remove(host
);
2222 mmc_detach_bus(host
);
2223 mmc_power_off(host
);
2224 mmc_release_host(host
);
2228 case PM_POST_SUSPEND
:
2229 case PM_POST_HIBERNATION
:
2230 case PM_POST_RESTORE
:
2232 spin_lock_irqsave(&host
->lock
, flags
);
2233 host
->rescan_disable
= 0;
2234 spin_unlock_irqrestore(&host
->lock
, flags
);
2235 mmc_detect_change(host
, 0);
2243 static int __init
mmc_init(void)
2247 workqueue
= alloc_ordered_workqueue("kmmcd", 0);
2251 ret
= mmc_register_bus();
2253 goto destroy_workqueue
;
2255 ret
= mmc_register_host_class();
2257 goto unregister_bus
;
2259 ret
= sdio_register_bus();
2261 goto unregister_host_class
;
2265 unregister_host_class
:
2266 mmc_unregister_host_class();
2268 mmc_unregister_bus();
2270 destroy_workqueue(workqueue
);
2275 static void __exit
mmc_exit(void)
2277 sdio_unregister_bus();
2278 mmc_unregister_host_class();
2279 mmc_unregister_bus();
2280 destroy_workqueue(workqueue
);
2283 subsys_initcall(mmc_init
);
2284 module_exit(mmc_exit
);
2286 MODULE_LICENSE("GPL");