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
) {
144 pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
145 mmc_hostname(host
), cmd
->opcode
, err
);
149 host
->ops
->request(host
, mrq
);
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 wait_for_completion(&mrq
->completion
);
260 * mmc_pre_req - Prepare for a new request
261 * @host: MMC host to prepare command
262 * @mrq: MMC request to prepare for
263 * @is_first_req: true if there is no previous started request
264 * that may run in parellel to this call, otherwise false
266 * mmc_pre_req() is called in prior to mmc_start_req() to let
267 * host prepare for the new request. Preparation of a request may be
268 * performed while another request is running on the host.
270 static void mmc_pre_req(struct mmc_host
*host
, struct mmc_request
*mrq
,
273 if (host
->ops
->pre_req
)
274 host
->ops
->pre_req(host
, mrq
, is_first_req
);
278 * mmc_post_req - Post process a completed request
279 * @host: MMC host to post process command
280 * @mrq: MMC request to post process for
281 * @err: Error, if non zero, clean up any resources made in pre_req
283 * Let the host post process a completed request. Post processing of
284 * a request may be performed while another reuqest is running.
286 static void mmc_post_req(struct mmc_host
*host
, struct mmc_request
*mrq
,
289 if (host
->ops
->post_req
)
290 host
->ops
->post_req(host
, mrq
, err
);
294 * mmc_start_req - start a non-blocking request
295 * @host: MMC host to start command
296 * @areq: async request to start
297 * @error: out parameter returns 0 for success, otherwise non zero
299 * Start a new MMC custom command request for a host.
300 * If there is on ongoing async request wait for completion
301 * of that request and start the new one and return.
302 * Does not wait for the new request to complete.
304 * Returns the completed request, NULL in case of none completed.
305 * Wait for the an ongoing request (previoulsy started) to complete and
306 * return the completed request. If there is no ongoing request, NULL
307 * is returned without waiting. NULL is not an error condition.
309 struct mmc_async_req
*mmc_start_req(struct mmc_host
*host
,
310 struct mmc_async_req
*areq
, int *error
)
313 struct mmc_async_req
*data
= host
->areq
;
315 /* Prepare a new request */
317 mmc_pre_req(host
, areq
->mrq
, !host
->areq
);
320 mmc_wait_for_req_done(host
, host
->areq
->mrq
);
321 err
= host
->areq
->err_check(host
->card
, host
->areq
);
323 /* post process the completed failed request */
324 mmc_post_req(host
, host
->areq
->mrq
, 0);
327 * Cancel the new prepared request, because
328 * it can't run until the failed
329 * request has been properly handled.
331 mmc_post_req(host
, areq
->mrq
, -EINVAL
);
339 __mmc_start_req(host
, areq
->mrq
);
342 mmc_post_req(host
, host
->areq
->mrq
, 0);
350 EXPORT_SYMBOL(mmc_start_req
);
353 * mmc_wait_for_req - start a request and wait for completion
354 * @host: MMC host to start command
355 * @mrq: MMC request to start
357 * Start a new MMC custom command request for a host, and wait
358 * for the command to complete. Does not attempt to parse the
361 void mmc_wait_for_req(struct mmc_host
*host
, struct mmc_request
*mrq
)
363 __mmc_start_req(host
, mrq
);
364 mmc_wait_for_req_done(host
, mrq
);
366 EXPORT_SYMBOL(mmc_wait_for_req
);
369 * mmc_wait_for_cmd - start a command and wait for completion
370 * @host: MMC host to start command
371 * @cmd: MMC command to start
372 * @retries: maximum number of retries
374 * Start a new MMC command for a host, and wait for the command
375 * to complete. Return any error that occurred while the command
376 * was executing. Do not attempt to parse the response.
378 int mmc_wait_for_cmd(struct mmc_host
*host
, struct mmc_command
*cmd
, int retries
)
380 struct mmc_request mrq
= {NULL
};
382 WARN_ON(!host
->claimed
);
384 memset(cmd
->resp
, 0, sizeof(cmd
->resp
));
385 cmd
->retries
= retries
;
390 mmc_wait_for_req(host
, &mrq
);
395 EXPORT_SYMBOL(mmc_wait_for_cmd
);
398 * mmc_set_data_timeout - set the timeout for a data command
399 * @data: data phase for command
400 * @card: the MMC card associated with the data transfer
402 * Computes the data timeout parameters according to the
403 * correct algorithm given the card type.
405 void mmc_set_data_timeout(struct mmc_data
*data
, const struct mmc_card
*card
)
410 * SDIO cards only define an upper 1 s limit on access.
412 if (mmc_card_sdio(card
)) {
413 data
->timeout_ns
= 1000000000;
414 data
->timeout_clks
= 0;
419 * SD cards use a 100 multiplier rather than 10
421 mult
= mmc_card_sd(card
) ? 100 : 10;
424 * Scale up the multiplier (and therefore the timeout) by
425 * the r2w factor for writes.
427 if (data
->flags
& MMC_DATA_WRITE
)
428 mult
<<= card
->csd
.r2w_factor
;
430 data
->timeout_ns
= card
->csd
.tacc_ns
* mult
;
431 data
->timeout_clks
= card
->csd
.tacc_clks
* mult
;
434 * SD cards also have an upper limit on the timeout.
436 if (mmc_card_sd(card
)) {
437 unsigned int timeout_us
, limit_us
;
439 timeout_us
= data
->timeout_ns
/ 1000;
440 if (mmc_host_clk_rate(card
->host
))
441 timeout_us
+= data
->timeout_clks
* 1000 /
442 (mmc_host_clk_rate(card
->host
) / 1000);
444 if (data
->flags
& MMC_DATA_WRITE
)
446 * The limit is really 250 ms, but that is
447 * insufficient for some crappy cards.
454 * SDHC cards always use these fixed values.
456 if (timeout_us
> limit_us
|| mmc_card_blockaddr(card
)) {
457 data
->timeout_ns
= limit_us
* 1000;
458 data
->timeout_clks
= 0;
462 * Some cards need very high timeouts if driven in SPI mode.
463 * The worst observed timeout was 900ms after writing a
464 * continuous stream of data until the internal logic
467 if (mmc_host_is_spi(card
->host
)) {
468 if (data
->flags
& MMC_DATA_WRITE
) {
469 if (data
->timeout_ns
< 1000000000)
470 data
->timeout_ns
= 1000000000; /* 1s */
472 if (data
->timeout_ns
< 100000000)
473 data
->timeout_ns
= 100000000; /* 100ms */
477 EXPORT_SYMBOL(mmc_set_data_timeout
);
480 * mmc_align_data_size - pads a transfer size to a more optimal value
481 * @card: the MMC card associated with the data transfer
482 * @sz: original transfer size
484 * Pads the original data size with a number of extra bytes in
485 * order to avoid controller bugs and/or performance hits
486 * (e.g. some controllers revert to PIO for certain sizes).
488 * Returns the improved size, which might be unmodified.
490 * Note that this function is only relevant when issuing a
491 * single scatter gather entry.
493 unsigned int mmc_align_data_size(struct mmc_card
*card
, unsigned int sz
)
496 * FIXME: We don't have a system for the controller to tell
497 * the core about its problems yet, so for now we just 32-bit
500 sz
= ((sz
+ 3) / 4) * 4;
504 EXPORT_SYMBOL(mmc_align_data_size
);
507 * mmc_host_enable - enable a host.
508 * @host: mmc host to enable
510 * Hosts that support power saving can use the 'enable' and 'disable'
511 * methods to exit and enter power saving states. For more information
512 * see comments for struct mmc_host_ops.
514 int mmc_host_enable(struct mmc_host
*host
)
516 if (!(host
->caps
& MMC_CAP_DISABLE
))
519 if (host
->en_dis_recurs
)
522 if (host
->nesting_cnt
++)
525 cancel_delayed_work_sync(&host
->disable
);
530 if (host
->ops
->enable
) {
533 host
->en_dis_recurs
= 1;
534 err
= host
->ops
->enable(host
);
535 host
->en_dis_recurs
= 0;
538 pr_debug("%s: enable error %d\n",
539 mmc_hostname(host
), err
);
546 EXPORT_SYMBOL(mmc_host_enable
);
548 static int mmc_host_do_disable(struct mmc_host
*host
, int lazy
)
550 if (host
->ops
->disable
) {
553 host
->en_dis_recurs
= 1;
554 err
= host
->ops
->disable(host
, lazy
);
555 host
->en_dis_recurs
= 0;
558 pr_debug("%s: disable error %d\n",
559 mmc_hostname(host
), err
);
563 unsigned long delay
= msecs_to_jiffies(err
);
565 mmc_schedule_delayed_work(&host
->disable
, delay
);
573 * mmc_host_disable - disable a host.
574 * @host: mmc host to disable
576 * Hosts that support power saving can use the 'enable' and 'disable'
577 * methods to exit and enter power saving states. For more information
578 * see comments for struct mmc_host_ops.
580 int mmc_host_disable(struct mmc_host
*host
)
584 if (!(host
->caps
& MMC_CAP_DISABLE
))
587 if (host
->en_dis_recurs
)
590 if (--host
->nesting_cnt
)
596 err
= mmc_host_do_disable(host
, 0);
599 EXPORT_SYMBOL(mmc_host_disable
);
602 * __mmc_claim_host - exclusively claim a host
603 * @host: mmc host to claim
604 * @abort: whether or not the operation should be aborted
606 * Claim a host for a set of operations. If @abort is non null and
607 * dereference a non-zero value then this will return prematurely with
608 * that non-zero value without acquiring the lock. Returns zero
609 * with the lock held otherwise.
611 int __mmc_claim_host(struct mmc_host
*host
, atomic_t
*abort
)
613 DECLARE_WAITQUEUE(wait
, current
);
619 add_wait_queue(&host
->wq
, &wait
);
620 spin_lock_irqsave(&host
->lock
, flags
);
622 set_current_state(TASK_UNINTERRUPTIBLE
);
623 stop
= abort
? atomic_read(abort
) : 0;
624 if (stop
|| !host
->claimed
|| host
->claimer
== current
)
626 spin_unlock_irqrestore(&host
->lock
, flags
);
628 spin_lock_irqsave(&host
->lock
, flags
);
630 set_current_state(TASK_RUNNING
);
633 host
->claimer
= current
;
634 host
->claim_cnt
+= 1;
637 spin_unlock_irqrestore(&host
->lock
, flags
);
638 remove_wait_queue(&host
->wq
, &wait
);
640 mmc_host_enable(host
);
644 EXPORT_SYMBOL(__mmc_claim_host
);
647 * mmc_try_claim_host - try exclusively to claim a host
648 * @host: mmc host to claim
650 * Returns %1 if the host is claimed, %0 otherwise.
652 int mmc_try_claim_host(struct mmc_host
*host
)
654 int claimed_host
= 0;
657 spin_lock_irqsave(&host
->lock
, flags
);
658 if (!host
->claimed
|| host
->claimer
== current
) {
660 host
->claimer
= current
;
661 host
->claim_cnt
+= 1;
664 spin_unlock_irqrestore(&host
->lock
, flags
);
667 EXPORT_SYMBOL(mmc_try_claim_host
);
670 * mmc_do_release_host - release a claimed host
671 * @host: mmc host to release
673 * If you successfully claimed a host, this function will
676 void mmc_do_release_host(struct mmc_host
*host
)
680 spin_lock_irqsave(&host
->lock
, flags
);
681 if (--host
->claim_cnt
) {
682 /* Release for nested claim */
683 spin_unlock_irqrestore(&host
->lock
, flags
);
686 host
->claimer
= NULL
;
687 spin_unlock_irqrestore(&host
->lock
, flags
);
691 EXPORT_SYMBOL(mmc_do_release_host
);
693 void mmc_host_deeper_disable(struct work_struct
*work
)
695 struct mmc_host
*host
=
696 container_of(work
, struct mmc_host
, disable
.work
);
698 /* If the host is claimed then we do not want to disable it anymore */
699 if (!mmc_try_claim_host(host
))
701 mmc_host_do_disable(host
, 1);
702 mmc_do_release_host(host
);
706 * mmc_host_lazy_disable - lazily disable a host.
707 * @host: mmc host to disable
709 * Hosts that support power saving can use the 'enable' and 'disable'
710 * methods to exit and enter power saving states. For more information
711 * see comments for struct mmc_host_ops.
713 int mmc_host_lazy_disable(struct mmc_host
*host
)
715 if (!(host
->caps
& MMC_CAP_DISABLE
))
718 if (host
->en_dis_recurs
)
721 if (--host
->nesting_cnt
)
727 if (host
->disable_delay
) {
728 mmc_schedule_delayed_work(&host
->disable
,
729 msecs_to_jiffies(host
->disable_delay
));
732 return mmc_host_do_disable(host
, 1);
734 EXPORT_SYMBOL(mmc_host_lazy_disable
);
737 * mmc_release_host - release a host
738 * @host: mmc host to release
740 * Release a MMC host, allowing others to claim the host
741 * for their operations.
743 void mmc_release_host(struct mmc_host
*host
)
745 WARN_ON(!host
->claimed
);
747 mmc_host_lazy_disable(host
);
749 mmc_do_release_host(host
);
752 EXPORT_SYMBOL(mmc_release_host
);
755 * Internal function that does the actual ios call to the host driver,
756 * optionally printing some debug output.
758 static inline void mmc_set_ios(struct mmc_host
*host
)
760 struct mmc_ios
*ios
= &host
->ios
;
762 pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u "
763 "width %u timing %u\n",
764 mmc_hostname(host
), ios
->clock
, ios
->bus_mode
,
765 ios
->power_mode
, ios
->chip_select
, ios
->vdd
,
766 ios
->bus_width
, ios
->timing
);
769 mmc_set_ungated(host
);
770 host
->ops
->set_ios(host
, ios
);
774 * Control chip select pin on a host.
776 void mmc_set_chip_select(struct mmc_host
*host
, int mode
)
778 mmc_host_clk_hold(host
);
779 host
->ios
.chip_select
= mode
;
781 mmc_host_clk_release(host
);
785 * Sets the host clock to the highest possible frequency that
788 static void __mmc_set_clock(struct mmc_host
*host
, unsigned int hz
)
790 WARN_ON(hz
< host
->f_min
);
792 if (hz
> host
->f_max
)
795 host
->ios
.clock
= hz
;
799 void mmc_set_clock(struct mmc_host
*host
, unsigned int hz
)
801 mmc_host_clk_hold(host
);
802 __mmc_set_clock(host
, hz
);
803 mmc_host_clk_release(host
);
806 #ifdef CONFIG_MMC_CLKGATE
808 * This gates the clock by setting it to 0 Hz.
810 void mmc_gate_clock(struct mmc_host
*host
)
814 spin_lock_irqsave(&host
->clk_lock
, flags
);
815 host
->clk_old
= host
->ios
.clock
;
817 host
->clk_gated
= true;
818 spin_unlock_irqrestore(&host
->clk_lock
, flags
);
823 * This restores the clock from gating by using the cached
826 void mmc_ungate_clock(struct mmc_host
*host
)
829 * We should previously have gated the clock, so the clock shall
830 * be 0 here! The clock may however be 0 during initialization,
831 * when some request operations are performed before setting
832 * the frequency. When ungate is requested in that situation
833 * we just ignore the call.
836 BUG_ON(host
->ios
.clock
);
837 /* This call will also set host->clk_gated to false */
838 __mmc_set_clock(host
, host
->clk_old
);
842 void mmc_set_ungated(struct mmc_host
*host
)
847 * We've been given a new frequency while the clock is gated,
848 * so make sure we regard this as ungating it.
850 spin_lock_irqsave(&host
->clk_lock
, flags
);
851 host
->clk_gated
= false;
852 spin_unlock_irqrestore(&host
->clk_lock
, flags
);
856 void mmc_set_ungated(struct mmc_host
*host
)
862 * Change the bus mode (open drain/push-pull) of a host.
864 void mmc_set_bus_mode(struct mmc_host
*host
, unsigned int mode
)
866 mmc_host_clk_hold(host
);
867 host
->ios
.bus_mode
= mode
;
869 mmc_host_clk_release(host
);
873 * Change data bus width of a host.
875 void mmc_set_bus_width(struct mmc_host
*host
, unsigned int width
)
877 mmc_host_clk_hold(host
);
878 host
->ios
.bus_width
= width
;
880 mmc_host_clk_release(host
);
884 * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number
886 * @low_bits: prefer low bits in boundary cases
888 * This function returns the OCR bit number according to the provided @vdd
889 * value. If conversion is not possible a negative errno value returned.
891 * Depending on the @low_bits flag the function prefers low or high OCR bits
892 * on boundary voltages. For example,
893 * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33);
894 * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34);
896 * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21).
898 static int mmc_vdd_to_ocrbitnum(int vdd
, bool low_bits
)
900 const int max_bit
= ilog2(MMC_VDD_35_36
);
903 if (vdd
< 1650 || vdd
> 3600)
906 if (vdd
>= 1650 && vdd
<= 1950)
907 return ilog2(MMC_VDD_165_195
);
912 /* Base 2000 mV, step 100 mV, bit's base 8. */
913 bit
= (vdd
- 2000) / 100 + 8;
920 * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask
921 * @vdd_min: minimum voltage value (mV)
922 * @vdd_max: maximum voltage value (mV)
924 * This function returns the OCR mask bits according to the provided @vdd_min
925 * and @vdd_max values. If conversion is not possible the function returns 0.
927 * Notes wrt boundary cases:
928 * This function sets the OCR bits for all boundary voltages, for example
929 * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 |
930 * MMC_VDD_34_35 mask.
932 u32
mmc_vddrange_to_ocrmask(int vdd_min
, int vdd_max
)
936 if (vdd_max
< vdd_min
)
939 /* Prefer high bits for the boundary vdd_max values. */
940 vdd_max
= mmc_vdd_to_ocrbitnum(vdd_max
, false);
944 /* Prefer low bits for the boundary vdd_min values. */
945 vdd_min
= mmc_vdd_to_ocrbitnum(vdd_min
, true);
949 /* Fill the mask, from max bit to min bit. */
950 while (vdd_max
>= vdd_min
)
951 mask
|= 1 << vdd_max
--;
955 EXPORT_SYMBOL(mmc_vddrange_to_ocrmask
);
957 #ifdef CONFIG_REGULATOR
960 * mmc_regulator_get_ocrmask - return mask of supported voltages
961 * @supply: regulator to use
963 * This returns either a negative errno, or a mask of voltages that
964 * can be provided to MMC/SD/SDIO devices using the specified voltage
965 * regulator. This would normally be called before registering the
968 int mmc_regulator_get_ocrmask(struct regulator
*supply
)
974 count
= regulator_count_voltages(supply
);
978 for (i
= 0; i
< count
; i
++) {
982 vdd_uV
= regulator_list_voltage(supply
, i
);
986 vdd_mV
= vdd_uV
/ 1000;
987 result
|= mmc_vddrange_to_ocrmask(vdd_mV
, vdd_mV
);
992 EXPORT_SYMBOL(mmc_regulator_get_ocrmask
);
995 * mmc_regulator_set_ocr - set regulator to match host->ios voltage
996 * @mmc: the host to regulate
997 * @supply: regulator to use
998 * @vdd_bit: zero for power off, else a bit number (host->ios.vdd)
1000 * Returns zero on success, else negative errno.
1002 * MMC host drivers may use this to enable or disable a regulator using
1003 * a particular supply voltage. This would normally be called from the
1006 int mmc_regulator_set_ocr(struct mmc_host
*mmc
,
1007 struct regulator
*supply
,
1008 unsigned short vdd_bit
)
1017 /* REVISIT mmc_vddrange_to_ocrmask() may have set some
1018 * bits this regulator doesn't quite support ... don't
1019 * be too picky, most cards and regulators are OK with
1020 * a 0.1V range goof (it's a small error percentage).
1022 tmp
= vdd_bit
- ilog2(MMC_VDD_165_195
);
1024 min_uV
= 1650 * 1000;
1025 max_uV
= 1950 * 1000;
1027 min_uV
= 1900 * 1000 + tmp
* 100 * 1000;
1028 max_uV
= min_uV
+ 100 * 1000;
1031 /* avoid needless changes to this voltage; the regulator
1032 * might not allow this operation
1034 voltage
= regulator_get_voltage(supply
);
1037 else if (voltage
< min_uV
|| voltage
> max_uV
)
1038 result
= regulator_set_voltage(supply
, min_uV
, max_uV
);
1042 if (result
== 0 && !mmc
->regulator_enabled
) {
1043 result
= regulator_enable(supply
);
1045 mmc
->regulator_enabled
= true;
1047 } else if (mmc
->regulator_enabled
) {
1048 result
= regulator_disable(supply
);
1050 mmc
->regulator_enabled
= false;
1054 dev_err(mmc_dev(mmc
),
1055 "could not set regulator OCR (%d)\n", result
);
1058 EXPORT_SYMBOL(mmc_regulator_set_ocr
);
1060 #endif /* CONFIG_REGULATOR */
1063 * Mask off any voltages we don't support and select
1064 * the lowest voltage
1066 u32
mmc_select_voltage(struct mmc_host
*host
, u32 ocr
)
1070 ocr
&= host
->ocr_avail
;
1078 mmc_host_clk_hold(host
);
1079 host
->ios
.vdd
= bit
;
1081 mmc_host_clk_release(host
);
1083 pr_warning("%s: host doesn't support card's voltages\n",
1084 mmc_hostname(host
));
1091 int mmc_set_signal_voltage(struct mmc_host
*host
, int signal_voltage
, bool cmd11
)
1093 struct mmc_command cmd
= {0};
1099 * Send CMD11 only if the request is to switch the card to
1102 if ((signal_voltage
!= MMC_SIGNAL_VOLTAGE_330
) && cmd11
) {
1103 cmd
.opcode
= SD_SWITCH_VOLTAGE
;
1105 cmd
.flags
= MMC_RSP_R1
| MMC_CMD_AC
;
1107 err
= mmc_wait_for_cmd(host
, &cmd
, 0);
1111 if (!mmc_host_is_spi(host
) && (cmd
.resp
[0] & R1_ERROR
))
1115 host
->ios
.signal_voltage
= signal_voltage
;
1117 if (host
->ops
->start_signal_voltage_switch
)
1118 err
= host
->ops
->start_signal_voltage_switch(host
, &host
->ios
);
1124 * Select timing parameters for host.
1126 void mmc_set_timing(struct mmc_host
*host
, unsigned int timing
)
1128 mmc_host_clk_hold(host
);
1129 host
->ios
.timing
= timing
;
1131 mmc_host_clk_release(host
);
1135 * Select appropriate driver type for host.
1137 void mmc_set_driver_type(struct mmc_host
*host
, unsigned int drv_type
)
1139 mmc_host_clk_hold(host
);
1140 host
->ios
.drv_type
= drv_type
;
1142 mmc_host_clk_release(host
);
1146 * Apply power to the MMC stack. This is a two-stage process.
1147 * First, we enable power to the card without the clock running.
1148 * We then wait a bit for the power to stabilise. Finally,
1149 * enable the bus drivers and clock to the card.
1151 * We must _NOT_ enable the clock prior to power stablising.
1153 * If a host does all the power sequencing itself, ignore the
1154 * initial MMC_POWER_UP stage.
1156 static void mmc_power_up(struct mmc_host
*host
)
1160 mmc_host_clk_hold(host
);
1162 /* If ocr is set, we use it */
1164 bit
= ffs(host
->ocr
) - 1;
1166 bit
= fls(host
->ocr_avail
) - 1;
1168 host
->ios
.vdd
= bit
;
1169 if (mmc_host_is_spi(host
))
1170 host
->ios
.chip_select
= MMC_CS_HIGH
;
1172 host
->ios
.chip_select
= MMC_CS_DONTCARE
;
1173 host
->ios
.bus_mode
= MMC_BUSMODE_PUSHPULL
;
1174 host
->ios
.power_mode
= MMC_POWER_UP
;
1175 host
->ios
.bus_width
= MMC_BUS_WIDTH_1
;
1176 host
->ios
.timing
= MMC_TIMING_LEGACY
;
1180 * This delay should be sufficient to allow the power supply
1181 * to reach the minimum voltage.
1185 host
->ios
.clock
= host
->f_init
;
1187 host
->ios
.power_mode
= MMC_POWER_ON
;
1191 * This delay must be at least 74 clock sizes, or 1 ms, or the
1192 * time required to reach a stable voltage.
1196 mmc_host_clk_release(host
);
1199 void mmc_power_off(struct mmc_host
*host
)
1201 mmc_host_clk_hold(host
);
1203 host
->ios
.clock
= 0;
1207 * Reset ocr mask to be the highest possible voltage supported for
1208 * this mmc host. This value will be used at next power up.
1210 host
->ocr
= 1 << (fls(host
->ocr_avail
) - 1);
1212 if (!mmc_host_is_spi(host
)) {
1213 host
->ios
.bus_mode
= MMC_BUSMODE_OPENDRAIN
;
1214 host
->ios
.chip_select
= MMC_CS_DONTCARE
;
1216 host
->ios
.power_mode
= MMC_POWER_OFF
;
1217 host
->ios
.bus_width
= MMC_BUS_WIDTH_1
;
1218 host
->ios
.timing
= MMC_TIMING_LEGACY
;
1222 * Some configurations, such as the 802.11 SDIO card in the OLPC
1223 * XO-1.5, require a short delay after poweroff before the card
1224 * can be successfully turned on again.
1228 mmc_host_clk_release(host
);
1232 * Cleanup when the last reference to the bus operator is dropped.
1234 static void __mmc_release_bus(struct mmc_host
*host
)
1237 BUG_ON(host
->bus_refs
);
1238 BUG_ON(!host
->bus_dead
);
1240 host
->bus_ops
= NULL
;
1244 * Increase reference count of bus operator
1246 static inline void mmc_bus_get(struct mmc_host
*host
)
1248 unsigned long flags
;
1250 spin_lock_irqsave(&host
->lock
, flags
);
1252 spin_unlock_irqrestore(&host
->lock
, flags
);
1256 * Decrease reference count of bus operator and free it if
1257 * it is the last reference.
1259 static inline void mmc_bus_put(struct mmc_host
*host
)
1261 unsigned long flags
;
1263 spin_lock_irqsave(&host
->lock
, flags
);
1265 if ((host
->bus_refs
== 0) && host
->bus_ops
)
1266 __mmc_release_bus(host
);
1267 spin_unlock_irqrestore(&host
->lock
, flags
);
1271 * Assign a mmc bus handler to a host. Only one bus handler may control a
1272 * host at any given time.
1274 void mmc_attach_bus(struct mmc_host
*host
, const struct mmc_bus_ops
*ops
)
1276 unsigned long flags
;
1281 WARN_ON(!host
->claimed
);
1283 spin_lock_irqsave(&host
->lock
, flags
);
1285 BUG_ON(host
->bus_ops
);
1286 BUG_ON(host
->bus_refs
);
1288 host
->bus_ops
= ops
;
1292 spin_unlock_irqrestore(&host
->lock
, flags
);
1296 * Remove the current bus handler from a host.
1298 void mmc_detach_bus(struct mmc_host
*host
)
1300 unsigned long flags
;
1304 WARN_ON(!host
->claimed
);
1305 WARN_ON(!host
->bus_ops
);
1307 spin_lock_irqsave(&host
->lock
, flags
);
1311 spin_unlock_irqrestore(&host
->lock
, flags
);
1317 * mmc_detect_change - process change of state on a MMC socket
1318 * @host: host which changed state.
1319 * @delay: optional delay to wait before detection (jiffies)
1321 * MMC drivers should call this when they detect a card has been
1322 * inserted or removed. The MMC layer will confirm that any
1323 * present card is still functional, and initialize any newly
1326 void mmc_detect_change(struct mmc_host
*host
, unsigned long delay
)
1328 #ifdef CONFIG_MMC_DEBUG
1329 unsigned long flags
;
1330 spin_lock_irqsave(&host
->lock
, flags
);
1331 WARN_ON(host
->removed
);
1332 spin_unlock_irqrestore(&host
->lock
, flags
);
1335 mmc_schedule_delayed_work(&host
->detect
, delay
);
1338 EXPORT_SYMBOL(mmc_detect_change
);
1340 void mmc_init_erase(struct mmc_card
*card
)
1344 if (is_power_of_2(card
->erase_size
))
1345 card
->erase_shift
= ffs(card
->erase_size
) - 1;
1347 card
->erase_shift
= 0;
1350 * It is possible to erase an arbitrarily large area of an SD or MMC
1351 * card. That is not desirable because it can take a long time
1352 * (minutes) potentially delaying more important I/O, and also the
1353 * timeout calculations become increasingly hugely over-estimated.
1354 * Consequently, 'pref_erase' is defined as a guide to limit erases
1355 * to that size and alignment.
1357 * For SD cards that define Allocation Unit size, limit erases to one
1358 * Allocation Unit at a time. For MMC cards that define High Capacity
1359 * Erase Size, whether it is switched on or not, limit to that size.
1360 * Otherwise just have a stab at a good value. For modern cards it
1361 * will end up being 4MiB. Note that if the value is too small, it
1362 * can end up taking longer to erase.
1364 if (mmc_card_sd(card
) && card
->ssr
.au
) {
1365 card
->pref_erase
= card
->ssr
.au
;
1366 card
->erase_shift
= ffs(card
->ssr
.au
) - 1;
1367 } else if (card
->ext_csd
.hc_erase_size
) {
1368 card
->pref_erase
= card
->ext_csd
.hc_erase_size
;
1370 sz
= (card
->csd
.capacity
<< (card
->csd
.read_blkbits
- 9)) >> 11;
1372 card
->pref_erase
= 512 * 1024 / 512;
1374 card
->pref_erase
= 1024 * 1024 / 512;
1376 card
->pref_erase
= 2 * 1024 * 1024 / 512;
1378 card
->pref_erase
= 4 * 1024 * 1024 / 512;
1379 if (card
->pref_erase
< card
->erase_size
)
1380 card
->pref_erase
= card
->erase_size
;
1382 sz
= card
->pref_erase
% card
->erase_size
;
1384 card
->pref_erase
+= card
->erase_size
- sz
;
1389 static unsigned int mmc_mmc_erase_timeout(struct mmc_card
*card
,
1390 unsigned int arg
, unsigned int qty
)
1392 unsigned int erase_timeout
;
1394 if (card
->ext_csd
.erase_group_def
& 1) {
1395 /* High Capacity Erase Group Size uses HC timeouts */
1396 if (arg
== MMC_TRIM_ARG
)
1397 erase_timeout
= card
->ext_csd
.trim_timeout
;
1399 erase_timeout
= card
->ext_csd
.hc_erase_timeout
;
1401 /* CSD Erase Group Size uses write timeout */
1402 unsigned int mult
= (10 << card
->csd
.r2w_factor
);
1403 unsigned int timeout_clks
= card
->csd
.tacc_clks
* mult
;
1404 unsigned int timeout_us
;
1406 /* Avoid overflow: e.g. tacc_ns=80000000 mult=1280 */
1407 if (card
->csd
.tacc_ns
< 1000000)
1408 timeout_us
= (card
->csd
.tacc_ns
* mult
) / 1000;
1410 timeout_us
= (card
->csd
.tacc_ns
/ 1000) * mult
;
1413 * ios.clock is only a target. The real clock rate might be
1414 * less but not that much less, so fudge it by multiplying by 2.
1417 timeout_us
+= (timeout_clks
* 1000) /
1418 (mmc_host_clk_rate(card
->host
) / 1000);
1420 erase_timeout
= timeout_us
/ 1000;
1423 * Theoretically, the calculation could underflow so round up
1424 * to 1ms in that case.
1430 /* Multiplier for secure operations */
1431 if (arg
& MMC_SECURE_ARGS
) {
1432 if (arg
== MMC_SECURE_ERASE_ARG
)
1433 erase_timeout
*= card
->ext_csd
.sec_erase_mult
;
1435 erase_timeout
*= card
->ext_csd
.sec_trim_mult
;
1438 erase_timeout
*= qty
;
1441 * Ensure at least a 1 second timeout for SPI as per
1442 * 'mmc_set_data_timeout()'
1444 if (mmc_host_is_spi(card
->host
) && erase_timeout
< 1000)
1445 erase_timeout
= 1000;
1447 return erase_timeout
;
1450 static unsigned int mmc_sd_erase_timeout(struct mmc_card
*card
,
1454 unsigned int erase_timeout
;
1456 if (card
->ssr
.erase_timeout
) {
1457 /* Erase timeout specified in SD Status Register (SSR) */
1458 erase_timeout
= card
->ssr
.erase_timeout
* qty
+
1459 card
->ssr
.erase_offset
;
1462 * Erase timeout not specified in SD Status Register (SSR) so
1463 * use 250ms per write block.
1465 erase_timeout
= 250 * qty
;
1468 /* Must not be less than 1 second */
1469 if (erase_timeout
< 1000)
1470 erase_timeout
= 1000;
1472 return erase_timeout
;
1475 static unsigned int mmc_erase_timeout(struct mmc_card
*card
,
1479 if (mmc_card_sd(card
))
1480 return mmc_sd_erase_timeout(card
, arg
, qty
);
1482 return mmc_mmc_erase_timeout(card
, arg
, qty
);
1485 static int mmc_do_erase(struct mmc_card
*card
, unsigned int from
,
1486 unsigned int to
, unsigned int arg
)
1488 struct mmc_command cmd
= {0};
1489 unsigned int qty
= 0;
1493 * qty is used to calculate the erase timeout which depends on how many
1494 * erase groups (or allocation units in SD terminology) are affected.
1495 * We count erasing part of an erase group as one erase group.
1496 * For SD, the allocation units are always a power of 2. For MMC, the
1497 * erase group size is almost certainly also power of 2, but it does not
1498 * seem to insist on that in the JEDEC standard, so we fall back to
1499 * division in that case. SD may not specify an allocation unit size,
1500 * in which case the timeout is based on the number of write blocks.
1502 * Note that the timeout for secure trim 2 will only be correct if the
1503 * number of erase groups specified is the same as the total of all
1504 * preceding secure trim 1 commands. Since the power may have been
1505 * lost since the secure trim 1 commands occurred, it is generally
1506 * impossible to calculate the secure trim 2 timeout correctly.
1508 if (card
->erase_shift
)
1509 qty
+= ((to
>> card
->erase_shift
) -
1510 (from
>> card
->erase_shift
)) + 1;
1511 else if (mmc_card_sd(card
))
1512 qty
+= to
- from
+ 1;
1514 qty
+= ((to
/ card
->erase_size
) -
1515 (from
/ card
->erase_size
)) + 1;
1517 if (!mmc_card_blockaddr(card
)) {
1522 if (mmc_card_sd(card
))
1523 cmd
.opcode
= SD_ERASE_WR_BLK_START
;
1525 cmd
.opcode
= MMC_ERASE_GROUP_START
;
1527 cmd
.flags
= MMC_RSP_SPI_R1
| MMC_RSP_R1
| MMC_CMD_AC
;
1528 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 0);
1530 printk(KERN_ERR
"mmc_erase: group start error %d, "
1531 "status %#x\n", err
, cmd
.resp
[0]);
1536 memset(&cmd
, 0, sizeof(struct mmc_command
));
1537 if (mmc_card_sd(card
))
1538 cmd
.opcode
= SD_ERASE_WR_BLK_END
;
1540 cmd
.opcode
= MMC_ERASE_GROUP_END
;
1542 cmd
.flags
= MMC_RSP_SPI_R1
| MMC_RSP_R1
| MMC_CMD_AC
;
1543 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 0);
1545 printk(KERN_ERR
"mmc_erase: group end error %d, status %#x\n",
1551 memset(&cmd
, 0, sizeof(struct mmc_command
));
1552 cmd
.opcode
= MMC_ERASE
;
1554 cmd
.flags
= MMC_RSP_SPI_R1B
| MMC_RSP_R1B
| MMC_CMD_AC
;
1555 cmd
.cmd_timeout_ms
= mmc_erase_timeout(card
, arg
, qty
);
1556 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 0);
1558 printk(KERN_ERR
"mmc_erase: erase error %d, status %#x\n",
1564 if (mmc_host_is_spi(card
->host
))
1568 memset(&cmd
, 0, sizeof(struct mmc_command
));
1569 cmd
.opcode
= MMC_SEND_STATUS
;
1570 cmd
.arg
= card
->rca
<< 16;
1571 cmd
.flags
= MMC_RSP_R1
| MMC_CMD_AC
;
1572 /* Do not retry else we can't see errors */
1573 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 0);
1574 if (err
|| (cmd
.resp
[0] & 0xFDF92000)) {
1575 printk(KERN_ERR
"error %d requesting status %#x\n",
1580 } while (!(cmd
.resp
[0] & R1_READY_FOR_DATA
) ||
1581 R1_CURRENT_STATE(cmd
.resp
[0]) == R1_STATE_PRG
);
1587 * mmc_erase - erase sectors.
1588 * @card: card to erase
1589 * @from: first sector to erase
1590 * @nr: number of sectors to erase
1591 * @arg: erase command argument (SD supports only %MMC_ERASE_ARG)
1593 * Caller must claim host before calling this function.
1595 int mmc_erase(struct mmc_card
*card
, unsigned int from
, unsigned int nr
,
1598 unsigned int rem
, to
= from
+ nr
;
1600 if (!(card
->host
->caps
& MMC_CAP_ERASE
) ||
1601 !(card
->csd
.cmdclass
& CCC_ERASE
))
1604 if (!card
->erase_size
)
1607 if (mmc_card_sd(card
) && arg
!= MMC_ERASE_ARG
)
1610 if ((arg
& MMC_SECURE_ARGS
) &&
1611 !(card
->ext_csd
.sec_feature_support
& EXT_CSD_SEC_ER_EN
))
1614 if ((arg
& MMC_TRIM_ARGS
) &&
1615 !(card
->ext_csd
.sec_feature_support
& EXT_CSD_SEC_GB_CL_EN
))
1618 if (arg
== MMC_SECURE_ERASE_ARG
) {
1619 if (from
% card
->erase_size
|| nr
% card
->erase_size
)
1623 if (arg
== MMC_ERASE_ARG
) {
1624 rem
= from
% card
->erase_size
;
1626 rem
= card
->erase_size
- rem
;
1633 rem
= nr
% card
->erase_size
;
1646 /* 'from' and 'to' are inclusive */
1649 return mmc_do_erase(card
, from
, to
, arg
);
1651 EXPORT_SYMBOL(mmc_erase
);
1653 int mmc_can_erase(struct mmc_card
*card
)
1655 if ((card
->host
->caps
& MMC_CAP_ERASE
) &&
1656 (card
->csd
.cmdclass
& CCC_ERASE
) && card
->erase_size
)
1660 EXPORT_SYMBOL(mmc_can_erase
);
1662 int mmc_can_trim(struct mmc_card
*card
)
1664 if (card
->ext_csd
.sec_feature_support
& EXT_CSD_SEC_GB_CL_EN
)
1668 EXPORT_SYMBOL(mmc_can_trim
);
1670 int mmc_can_secure_erase_trim(struct mmc_card
*card
)
1672 if (card
->ext_csd
.sec_feature_support
& EXT_CSD_SEC_ER_EN
)
1676 EXPORT_SYMBOL(mmc_can_secure_erase_trim
);
1678 int mmc_erase_group_aligned(struct mmc_card
*card
, unsigned int from
,
1681 if (!card
->erase_size
)
1683 if (from
% card
->erase_size
|| nr
% card
->erase_size
)
1687 EXPORT_SYMBOL(mmc_erase_group_aligned
);
1689 static unsigned int mmc_do_calc_max_discard(struct mmc_card
*card
,
1692 struct mmc_host
*host
= card
->host
;
1693 unsigned int max_discard
, x
, y
, qty
= 0, max_qty
, timeout
;
1694 unsigned int last_timeout
= 0;
1696 if (card
->erase_shift
)
1697 max_qty
= UINT_MAX
>> card
->erase_shift
;
1698 else if (mmc_card_sd(card
))
1701 max_qty
= UINT_MAX
/ card
->erase_size
;
1703 /* Find the largest qty with an OK timeout */
1706 for (x
= 1; x
&& x
<= max_qty
&& max_qty
- x
>= qty
; x
<<= 1) {
1707 timeout
= mmc_erase_timeout(card
, arg
, qty
+ x
);
1708 if (timeout
> host
->max_discard_to
)
1710 if (timeout
< last_timeout
)
1712 last_timeout
= timeout
;
1724 /* Convert qty to sectors */
1725 if (card
->erase_shift
)
1726 max_discard
= --qty
<< card
->erase_shift
;
1727 else if (mmc_card_sd(card
))
1730 max_discard
= --qty
* card
->erase_size
;
1735 unsigned int mmc_calc_max_discard(struct mmc_card
*card
)
1737 struct mmc_host
*host
= card
->host
;
1738 unsigned int max_discard
, max_trim
;
1740 if (!host
->max_discard_to
)
1744 * Without erase_group_def set, MMC erase timeout depends on clock
1745 * frequence which can change. In that case, the best choice is
1746 * just the preferred erase size.
1748 if (mmc_card_mmc(card
) && !(card
->ext_csd
.erase_group_def
& 1))
1749 return card
->pref_erase
;
1751 max_discard
= mmc_do_calc_max_discard(card
, MMC_ERASE_ARG
);
1752 if (mmc_can_trim(card
)) {
1753 max_trim
= mmc_do_calc_max_discard(card
, MMC_TRIM_ARG
);
1754 if (max_trim
< max_discard
)
1755 max_discard
= max_trim
;
1756 } else if (max_discard
< card
->erase_size
) {
1759 pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n",
1760 mmc_hostname(host
), max_discard
, host
->max_discard_to
);
1763 EXPORT_SYMBOL(mmc_calc_max_discard
);
1765 int mmc_set_blocklen(struct mmc_card
*card
, unsigned int blocklen
)
1767 struct mmc_command cmd
= {0};
1769 if (mmc_card_blockaddr(card
) || mmc_card_ddr_mode(card
))
1772 cmd
.opcode
= MMC_SET_BLOCKLEN
;
1774 cmd
.flags
= MMC_RSP_SPI_R1
| MMC_RSP_R1
| MMC_CMD_AC
;
1775 return mmc_wait_for_cmd(card
->host
, &cmd
, 5);
1777 EXPORT_SYMBOL(mmc_set_blocklen
);
1779 static void mmc_hw_reset_for_init(struct mmc_host
*host
)
1781 if (!(host
->caps
& MMC_CAP_HW_RESET
) || !host
->ops
->hw_reset
)
1783 mmc_host_clk_hold(host
);
1784 host
->ops
->hw_reset(host
);
1785 mmc_host_clk_release(host
);
1788 int mmc_can_reset(struct mmc_card
*card
)
1792 if (!mmc_card_mmc(card
))
1794 rst_n_function
= card
->ext_csd
.rst_n_function
;
1795 if ((rst_n_function
& EXT_CSD_RST_N_EN_MASK
) != EXT_CSD_RST_N_ENABLED
)
1799 EXPORT_SYMBOL(mmc_can_reset
);
1801 static int mmc_do_hw_reset(struct mmc_host
*host
, int check
)
1803 struct mmc_card
*card
= host
->card
;
1805 if (!host
->bus_ops
->power_restore
)
1808 if (!(host
->caps
& MMC_CAP_HW_RESET
) || !host
->ops
->hw_reset
)
1814 if (!mmc_can_reset(card
))
1817 mmc_host_clk_hold(host
);
1818 mmc_set_clock(host
, host
->f_init
);
1820 host
->ops
->hw_reset(host
);
1822 /* If the reset has happened, then a status command will fail */
1824 struct mmc_command cmd
= {0};
1827 cmd
.opcode
= MMC_SEND_STATUS
;
1828 if (!mmc_host_is_spi(card
->host
))
1829 cmd
.arg
= card
->rca
<< 16;
1830 cmd
.flags
= MMC_RSP_SPI_R2
| MMC_RSP_R1
| MMC_CMD_AC
;
1831 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 0);
1833 mmc_host_clk_release(host
);
1838 host
->card
->state
&= ~(MMC_STATE_HIGHSPEED
| MMC_STATE_HIGHSPEED_DDR
);
1839 if (mmc_host_is_spi(host
)) {
1840 host
->ios
.chip_select
= MMC_CS_HIGH
;
1841 host
->ios
.bus_mode
= MMC_BUSMODE_PUSHPULL
;
1843 host
->ios
.chip_select
= MMC_CS_DONTCARE
;
1844 host
->ios
.bus_mode
= MMC_BUSMODE_OPENDRAIN
;
1846 host
->ios
.bus_width
= MMC_BUS_WIDTH_1
;
1847 host
->ios
.timing
= MMC_TIMING_LEGACY
;
1850 mmc_host_clk_release(host
);
1852 return host
->bus_ops
->power_restore(host
);
1855 int mmc_hw_reset(struct mmc_host
*host
)
1857 return mmc_do_hw_reset(host
, 0);
1859 EXPORT_SYMBOL(mmc_hw_reset
);
1861 int mmc_hw_reset_check(struct mmc_host
*host
)
1863 return mmc_do_hw_reset(host
, 1);
1865 EXPORT_SYMBOL(mmc_hw_reset_check
);
1867 static int mmc_rescan_try_freq(struct mmc_host
*host
, unsigned freq
)
1869 host
->f_init
= freq
;
1871 #ifdef CONFIG_MMC_DEBUG
1872 pr_info("%s: %s: trying to init card at %u Hz\n",
1873 mmc_hostname(host
), __func__
, host
->f_init
);
1878 * Some eMMCs (with VCCQ always on) may not be reset after power up, so
1879 * do a hardware reset if possible.
1881 mmc_hw_reset_for_init(host
);
1884 * sdio_reset sends CMD52 to reset card. Since we do not know
1885 * if the card is being re-initialized, just send it. CMD52
1886 * should be ignored by SD/eMMC cards.
1891 mmc_send_if_cond(host
, host
->ocr_avail
);
1893 /* Order's important: probe SDIO, then SD, then MMC */
1894 if (!mmc_attach_sdio(host
))
1896 if (!mmc_attach_sd(host
))
1898 if (!mmc_attach_mmc(host
))
1901 mmc_power_off(host
);
1905 void mmc_rescan(struct work_struct
*work
)
1907 static const unsigned freqs
[] = { 400000, 300000, 200000, 100000 };
1908 struct mmc_host
*host
=
1909 container_of(work
, struct mmc_host
, detect
.work
);
1912 if (host
->rescan_disable
)
1918 * if there is a _removable_ card registered, check whether it is
1921 if (host
->bus_ops
&& host
->bus_ops
->detect
&& !host
->bus_dead
1922 && !(host
->caps
& MMC_CAP_NONREMOVABLE
))
1923 host
->bus_ops
->detect(host
);
1926 * Let mmc_bus_put() free the bus/bus_ops if we've found that
1927 * the card is no longer present.
1932 /* if there still is a card present, stop here */
1933 if (host
->bus_ops
!= NULL
) {
1939 * Only we can add a new handler, so it's safe to
1940 * release the lock here.
1944 if (host
->ops
->get_cd
&& host
->ops
->get_cd(host
) == 0)
1947 mmc_claim_host(host
);
1948 for (i
= 0; i
< ARRAY_SIZE(freqs
); i
++) {
1949 if (!mmc_rescan_try_freq(host
, max(freqs
[i
], host
->f_min
)))
1951 if (freqs
[i
] <= host
->f_min
)
1954 mmc_release_host(host
);
1957 if (host
->caps
& MMC_CAP_NEEDS_POLL
)
1958 mmc_schedule_delayed_work(&host
->detect
, HZ
);
1961 void mmc_start_host(struct mmc_host
*host
)
1963 mmc_power_off(host
);
1964 mmc_detect_change(host
, 0);
1967 void mmc_stop_host(struct mmc_host
*host
)
1969 #ifdef CONFIG_MMC_DEBUG
1970 unsigned long flags
;
1971 spin_lock_irqsave(&host
->lock
, flags
);
1973 spin_unlock_irqrestore(&host
->lock
, flags
);
1976 if (host
->caps
& MMC_CAP_DISABLE
)
1977 cancel_delayed_work(&host
->disable
);
1978 cancel_delayed_work_sync(&host
->detect
);
1979 mmc_flush_scheduled_work();
1981 /* clear pm flags now and let card drivers set them as needed */
1985 if (host
->bus_ops
&& !host
->bus_dead
) {
1986 if (host
->bus_ops
->remove
)
1987 host
->bus_ops
->remove(host
);
1989 mmc_claim_host(host
);
1990 mmc_detach_bus(host
);
1991 mmc_power_off(host
);
1992 mmc_release_host(host
);
2000 mmc_power_off(host
);
2003 int mmc_power_save_host(struct mmc_host
*host
)
2007 #ifdef CONFIG_MMC_DEBUG
2008 pr_info("%s: %s: powering down\n", mmc_hostname(host
), __func__
);
2013 if (!host
->bus_ops
|| host
->bus_dead
|| !host
->bus_ops
->power_restore
) {
2018 if (host
->bus_ops
->power_save
)
2019 ret
= host
->bus_ops
->power_save(host
);
2023 mmc_power_off(host
);
2027 EXPORT_SYMBOL(mmc_power_save_host
);
2029 int mmc_power_restore_host(struct mmc_host
*host
)
2033 #ifdef CONFIG_MMC_DEBUG
2034 pr_info("%s: %s: powering up\n", mmc_hostname(host
), __func__
);
2039 if (!host
->bus_ops
|| host
->bus_dead
|| !host
->bus_ops
->power_restore
) {
2045 ret
= host
->bus_ops
->power_restore(host
);
2051 EXPORT_SYMBOL(mmc_power_restore_host
);
2053 int mmc_card_awake(struct mmc_host
*host
)
2059 if (host
->bus_ops
&& !host
->bus_dead
&& host
->bus_ops
->awake
)
2060 err
= host
->bus_ops
->awake(host
);
2066 EXPORT_SYMBOL(mmc_card_awake
);
2068 int mmc_card_sleep(struct mmc_host
*host
)
2074 if (host
->bus_ops
&& !host
->bus_dead
&& host
->bus_ops
->awake
)
2075 err
= host
->bus_ops
->sleep(host
);
2081 EXPORT_SYMBOL(mmc_card_sleep
);
2083 int mmc_card_can_sleep(struct mmc_host
*host
)
2085 struct mmc_card
*card
= host
->card
;
2087 if (card
&& mmc_card_mmc(card
) && card
->ext_csd
.rev
>= 3)
2091 EXPORT_SYMBOL(mmc_card_can_sleep
);
2096 * mmc_suspend_host - suspend a host
2099 int mmc_suspend_host(struct mmc_host
*host
)
2103 if (host
->caps
& MMC_CAP_DISABLE
)
2104 cancel_delayed_work(&host
->disable
);
2105 cancel_delayed_work(&host
->detect
);
2106 mmc_flush_scheduled_work();
2109 if (host
->bus_ops
&& !host
->bus_dead
) {
2110 if (host
->bus_ops
->suspend
)
2111 err
= host
->bus_ops
->suspend(host
);
2112 if (err
== -ENOSYS
|| !host
->bus_ops
->resume
) {
2114 * We simply "remove" the card in this case.
2115 * It will be redetected on resume.
2117 if (host
->bus_ops
->remove
)
2118 host
->bus_ops
->remove(host
);
2119 mmc_claim_host(host
);
2120 mmc_detach_bus(host
);
2121 mmc_power_off(host
);
2122 mmc_release_host(host
);
2129 if (!err
&& !mmc_card_keep_power(host
))
2130 mmc_power_off(host
);
2135 EXPORT_SYMBOL(mmc_suspend_host
);
2138 * mmc_resume_host - resume a previously suspended host
2141 int mmc_resume_host(struct mmc_host
*host
)
2146 if (host
->bus_ops
&& !host
->bus_dead
) {
2147 if (!mmc_card_keep_power(host
)) {
2149 mmc_select_voltage(host
, host
->ocr
);
2151 * Tell runtime PM core we just powered up the card,
2152 * since it still believes the card is powered off.
2153 * Note that currently runtime PM is only enabled
2154 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
2156 if (mmc_card_sdio(host
->card
) &&
2157 (host
->caps
& MMC_CAP_POWER_OFF_CARD
)) {
2158 pm_runtime_disable(&host
->card
->dev
);
2159 pm_runtime_set_active(&host
->card
->dev
);
2160 pm_runtime_enable(&host
->card
->dev
);
2163 BUG_ON(!host
->bus_ops
->resume
);
2164 err
= host
->bus_ops
->resume(host
);
2166 printk(KERN_WARNING
"%s: error %d during resume "
2167 "(card was removed?)\n",
2168 mmc_hostname(host
), err
);
2172 host
->pm_flags
&= ~MMC_PM_KEEP_POWER
;
2177 EXPORT_SYMBOL(mmc_resume_host
);
2179 /* Do the card removal on suspend if card is assumed removeable
2180 * Do that in pm notifier while userspace isn't yet frozen, so we will be able
2183 int mmc_pm_notify(struct notifier_block
*notify_block
,
2184 unsigned long mode
, void *unused
)
2186 struct mmc_host
*host
= container_of(
2187 notify_block
, struct mmc_host
, pm_notify
);
2188 unsigned long flags
;
2192 case PM_HIBERNATION_PREPARE
:
2193 case PM_SUSPEND_PREPARE
:
2195 spin_lock_irqsave(&host
->lock
, flags
);
2196 host
->rescan_disable
= 1;
2197 spin_unlock_irqrestore(&host
->lock
, flags
);
2198 cancel_delayed_work_sync(&host
->detect
);
2200 if (!host
->bus_ops
|| host
->bus_ops
->suspend
)
2203 mmc_claim_host(host
);
2205 if (host
->bus_ops
->remove
)
2206 host
->bus_ops
->remove(host
);
2208 mmc_detach_bus(host
);
2209 mmc_power_off(host
);
2210 mmc_release_host(host
);
2214 case PM_POST_SUSPEND
:
2215 case PM_POST_HIBERNATION
:
2216 case PM_POST_RESTORE
:
2218 spin_lock_irqsave(&host
->lock
, flags
);
2219 host
->rescan_disable
= 0;
2220 spin_unlock_irqrestore(&host
->lock
, flags
);
2221 mmc_detect_change(host
, 0);
2229 static int __init
mmc_init(void)
2233 workqueue
= alloc_ordered_workqueue("kmmcd", 0);
2237 ret
= mmc_register_bus();
2239 goto destroy_workqueue
;
2241 ret
= mmc_register_host_class();
2243 goto unregister_bus
;
2245 ret
= sdio_register_bus();
2247 goto unregister_host_class
;
2251 unregister_host_class
:
2252 mmc_unregister_host_class();
2254 mmc_unregister_bus();
2256 destroy_workqueue(workqueue
);
2261 static void __exit
mmc_exit(void)
2263 sdio_unregister_bus();
2264 mmc_unregister_host_class();
2265 mmc_unregister_bus();
2266 destroy_workqueue(workqueue
);
2269 subsys_initcall(mmc_init
);
2270 module_exit(mmc_exit
);
2272 MODULE_LICENSE("GPL");