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>
27 #include <linux/mmc/card.h>
28 #include <linux/mmc/host.h>
29 #include <linux/mmc/mmc.h>
30 #include <linux/mmc/sd.h>
41 static struct workqueue_struct
*workqueue
;
44 * Enabling software CRCs on the data blocks can be a significant (30%)
45 * performance cost, and for other reasons may not always be desired.
46 * So we allow it it to be disabled.
49 module_param(use_spi_crc
, bool, 0);
52 * We normally treat cards as removed during suspend if they are not
53 * known to be on a non-removable bus, to avoid the risk of writing
54 * back data to a different card after resume. Allow this to be
55 * overridden if necessary.
57 #ifdef CONFIG_MMC_UNSAFE_RESUME
58 int mmc_assume_removable
;
60 int mmc_assume_removable
= 1;
62 EXPORT_SYMBOL(mmc_assume_removable
);
63 module_param_named(removable
, mmc_assume_removable
, bool, 0644);
66 "MMC/SD cards are removable and may be removed during suspend");
69 * Internal function. Schedule delayed work in the MMC work queue.
71 static int mmc_schedule_delayed_work(struct delayed_work
*work
,
74 return queue_delayed_work(workqueue
, work
, delay
);
78 * Internal function. Flush all scheduled work from the MMC work queue.
80 static void mmc_flush_scheduled_work(void)
82 flush_workqueue(workqueue
);
86 * mmc_request_done - finish processing an MMC request
87 * @host: MMC host which completed request
88 * @mrq: MMC request which request
90 * MMC drivers should call this function when they have completed
91 * their processing of a request.
93 void mmc_request_done(struct mmc_host
*host
, struct mmc_request
*mrq
)
95 struct mmc_command
*cmd
= mrq
->cmd
;
98 if (err
&& cmd
->retries
&& mmc_host_is_spi(host
)) {
99 if (cmd
->resp
[0] & R1_SPI_ILLEGAL_COMMAND
)
103 if (err
&& cmd
->retries
) {
104 pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
105 mmc_hostname(host
), cmd
->opcode
, err
);
109 host
->ops
->request(host
, mrq
);
111 led_trigger_event(host
->led
, LED_OFF
);
113 pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n",
114 mmc_hostname(host
), cmd
->opcode
, err
,
115 cmd
->resp
[0], cmd
->resp
[1],
116 cmd
->resp
[2], cmd
->resp
[3]);
119 pr_debug("%s: %d bytes transferred: %d\n",
121 mrq
->data
->bytes_xfered
, mrq
->data
->error
);
125 pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n",
126 mmc_hostname(host
), mrq
->stop
->opcode
,
128 mrq
->stop
->resp
[0], mrq
->stop
->resp
[1],
129 mrq
->stop
->resp
[2], mrq
->stop
->resp
[3]);
135 mmc_host_clk_gate(host
);
139 EXPORT_SYMBOL(mmc_request_done
);
142 mmc_start_request(struct mmc_host
*host
, struct mmc_request
*mrq
)
144 #ifdef CONFIG_MMC_DEBUG
146 struct scatterlist
*sg
;
149 pr_debug("%s: starting CMD%u arg %08x flags %08x\n",
150 mmc_hostname(host
), mrq
->cmd
->opcode
,
151 mrq
->cmd
->arg
, mrq
->cmd
->flags
);
154 pr_debug("%s: blksz %d blocks %d flags %08x "
155 "tsac %d ms nsac %d\n",
156 mmc_hostname(host
), mrq
->data
->blksz
,
157 mrq
->data
->blocks
, mrq
->data
->flags
,
158 mrq
->data
->timeout_ns
/ 1000000,
159 mrq
->data
->timeout_clks
);
163 pr_debug("%s: CMD%u arg %08x flags %08x\n",
164 mmc_hostname(host
), mrq
->stop
->opcode
,
165 mrq
->stop
->arg
, mrq
->stop
->flags
);
168 WARN_ON(!host
->claimed
);
170 led_trigger_event(host
->led
, LED_FULL
);
175 BUG_ON(mrq
->data
->blksz
> host
->max_blk_size
);
176 BUG_ON(mrq
->data
->blocks
> host
->max_blk_count
);
177 BUG_ON(mrq
->data
->blocks
* mrq
->data
->blksz
>
180 #ifdef CONFIG_MMC_DEBUG
182 for_each_sg(mrq
->data
->sg
, sg
, mrq
->data
->sg_len
, i
)
184 BUG_ON(sz
!= mrq
->data
->blocks
* mrq
->data
->blksz
);
187 mrq
->cmd
->data
= mrq
->data
;
188 mrq
->data
->error
= 0;
189 mrq
->data
->mrq
= mrq
;
191 mrq
->data
->stop
= mrq
->stop
;
192 mrq
->stop
->error
= 0;
193 mrq
->stop
->mrq
= mrq
;
196 mmc_host_clk_ungate(host
);
197 host
->ops
->request(host
, mrq
);
200 static void mmc_wait_done(struct mmc_request
*mrq
)
202 complete(mrq
->done_data
);
206 * mmc_wait_for_req - start a request and wait for completion
207 * @host: MMC host to start command
208 * @mrq: MMC request to start
210 * Start a new MMC custom command request for a host, and wait
211 * for the command to complete. Does not attempt to parse the
214 void mmc_wait_for_req(struct mmc_host
*host
, struct mmc_request
*mrq
)
216 DECLARE_COMPLETION_ONSTACK(complete
);
218 mrq
->done_data
= &complete
;
219 mrq
->done
= mmc_wait_done
;
221 mmc_start_request(host
, mrq
);
223 wait_for_completion(&complete
);
226 EXPORT_SYMBOL(mmc_wait_for_req
);
229 * mmc_wait_for_cmd - start a command and wait for completion
230 * @host: MMC host to start command
231 * @cmd: MMC command to start
232 * @retries: maximum number of retries
234 * Start a new MMC command for a host, and wait for the command
235 * to complete. Return any error that occurred while the command
236 * was executing. Do not attempt to parse the response.
238 int mmc_wait_for_cmd(struct mmc_host
*host
, struct mmc_command
*cmd
, int retries
)
240 struct mmc_request mrq
;
242 WARN_ON(!host
->claimed
);
244 memset(&mrq
, 0, sizeof(struct mmc_request
));
246 memset(cmd
->resp
, 0, sizeof(cmd
->resp
));
247 cmd
->retries
= retries
;
252 mmc_wait_for_req(host
, &mrq
);
257 EXPORT_SYMBOL(mmc_wait_for_cmd
);
260 * mmc_set_data_timeout - set the timeout for a data command
261 * @data: data phase for command
262 * @card: the MMC card associated with the data transfer
264 * Computes the data timeout parameters according to the
265 * correct algorithm given the card type.
267 void mmc_set_data_timeout(struct mmc_data
*data
, const struct mmc_card
*card
)
272 * SDIO cards only define an upper 1 s limit on access.
274 if (mmc_card_sdio(card
)) {
275 data
->timeout_ns
= 1000000000;
276 data
->timeout_clks
= 0;
281 * SD cards use a 100 multiplier rather than 10
283 mult
= mmc_card_sd(card
) ? 100 : 10;
286 * Scale up the multiplier (and therefore the timeout) by
287 * the r2w factor for writes.
289 if (data
->flags
& MMC_DATA_WRITE
)
290 mult
<<= card
->csd
.r2w_factor
;
292 data
->timeout_ns
= card
->csd
.tacc_ns
* mult
;
293 data
->timeout_clks
= card
->csd
.tacc_clks
* mult
;
296 * SD cards also have an upper limit on the timeout.
298 if (mmc_card_sd(card
)) {
299 unsigned int timeout_us
, limit_us
;
301 timeout_us
= data
->timeout_ns
/ 1000;
302 timeout_us
+= data
->timeout_clks
* 1000 /
303 (mmc_host_clk_rate(card
->host
) / 1000);
305 if (data
->flags
& MMC_DATA_WRITE
)
307 * The limit is really 250 ms, but that is
308 * insufficient for some crappy cards.
315 * SDHC cards always use these fixed values.
317 if (timeout_us
> limit_us
|| mmc_card_blockaddr(card
)) {
318 data
->timeout_ns
= limit_us
* 1000;
319 data
->timeout_clks
= 0;
323 * Some cards need very high timeouts if driven in SPI mode.
324 * The worst observed timeout was 900ms after writing a
325 * continuous stream of data until the internal logic
328 if (mmc_host_is_spi(card
->host
)) {
329 if (data
->flags
& MMC_DATA_WRITE
) {
330 if (data
->timeout_ns
< 1000000000)
331 data
->timeout_ns
= 1000000000; /* 1s */
333 if (data
->timeout_ns
< 100000000)
334 data
->timeout_ns
= 100000000; /* 100ms */
338 EXPORT_SYMBOL(mmc_set_data_timeout
);
341 * mmc_align_data_size - pads a transfer size to a more optimal value
342 * @card: the MMC card associated with the data transfer
343 * @sz: original transfer size
345 * Pads the original data size with a number of extra bytes in
346 * order to avoid controller bugs and/or performance hits
347 * (e.g. some controllers revert to PIO for certain sizes).
349 * Returns the improved size, which might be unmodified.
351 * Note that this function is only relevant when issuing a
352 * single scatter gather entry.
354 unsigned int mmc_align_data_size(struct mmc_card
*card
, unsigned int sz
)
357 * FIXME: We don't have a system for the controller to tell
358 * the core about its problems yet, so for now we just 32-bit
361 sz
= ((sz
+ 3) / 4) * 4;
365 EXPORT_SYMBOL(mmc_align_data_size
);
368 * mmc_host_enable - enable a host.
369 * @host: mmc host to enable
371 * Hosts that support power saving can use the 'enable' and 'disable'
372 * methods to exit and enter power saving states. For more information
373 * see comments for struct mmc_host_ops.
375 int mmc_host_enable(struct mmc_host
*host
)
377 if (!(host
->caps
& MMC_CAP_DISABLE
))
380 if (host
->en_dis_recurs
)
383 if (host
->nesting_cnt
++)
386 cancel_delayed_work_sync(&host
->disable
);
391 if (host
->ops
->enable
) {
394 host
->en_dis_recurs
= 1;
395 err
= host
->ops
->enable(host
);
396 host
->en_dis_recurs
= 0;
399 pr_debug("%s: enable error %d\n",
400 mmc_hostname(host
), err
);
407 EXPORT_SYMBOL(mmc_host_enable
);
409 static int mmc_host_do_disable(struct mmc_host
*host
, int lazy
)
411 if (host
->ops
->disable
) {
414 host
->en_dis_recurs
= 1;
415 err
= host
->ops
->disable(host
, lazy
);
416 host
->en_dis_recurs
= 0;
419 pr_debug("%s: disable error %d\n",
420 mmc_hostname(host
), err
);
424 unsigned long delay
= msecs_to_jiffies(err
);
426 mmc_schedule_delayed_work(&host
->disable
, delay
);
434 * mmc_host_disable - disable a host.
435 * @host: mmc host to disable
437 * Hosts that support power saving can use the 'enable' and 'disable'
438 * methods to exit and enter power saving states. For more information
439 * see comments for struct mmc_host_ops.
441 int mmc_host_disable(struct mmc_host
*host
)
445 if (!(host
->caps
& MMC_CAP_DISABLE
))
448 if (host
->en_dis_recurs
)
451 if (--host
->nesting_cnt
)
457 err
= mmc_host_do_disable(host
, 0);
460 EXPORT_SYMBOL(mmc_host_disable
);
463 * __mmc_claim_host - exclusively claim a host
464 * @host: mmc host to claim
465 * @abort: whether or not the operation should be aborted
467 * Claim a host for a set of operations. If @abort is non null and
468 * dereference a non-zero value then this will return prematurely with
469 * that non-zero value without acquiring the lock. Returns zero
470 * with the lock held otherwise.
472 int __mmc_claim_host(struct mmc_host
*host
, atomic_t
*abort
)
474 DECLARE_WAITQUEUE(wait
, current
);
480 add_wait_queue(&host
->wq
, &wait
);
481 spin_lock_irqsave(&host
->lock
, flags
);
483 set_current_state(TASK_UNINTERRUPTIBLE
);
484 stop
= abort
? atomic_read(abort
) : 0;
485 if (stop
|| !host
->claimed
|| host
->claimer
== current
)
487 spin_unlock_irqrestore(&host
->lock
, flags
);
489 spin_lock_irqsave(&host
->lock
, flags
);
491 set_current_state(TASK_RUNNING
);
494 host
->claimer
= current
;
495 host
->claim_cnt
+= 1;
498 spin_unlock_irqrestore(&host
->lock
, flags
);
499 remove_wait_queue(&host
->wq
, &wait
);
501 mmc_host_enable(host
);
505 EXPORT_SYMBOL(__mmc_claim_host
);
508 * mmc_try_claim_host - try exclusively to claim a host
509 * @host: mmc host to claim
511 * Returns %1 if the host is claimed, %0 otherwise.
513 int mmc_try_claim_host(struct mmc_host
*host
)
515 int claimed_host
= 0;
518 spin_lock_irqsave(&host
->lock
, flags
);
519 if (!host
->claimed
|| host
->claimer
== current
) {
521 host
->claimer
= current
;
522 host
->claim_cnt
+= 1;
525 spin_unlock_irqrestore(&host
->lock
, flags
);
528 EXPORT_SYMBOL(mmc_try_claim_host
);
530 static void mmc_do_release_host(struct mmc_host
*host
)
534 spin_lock_irqsave(&host
->lock
, flags
);
535 if (--host
->claim_cnt
) {
536 /* Release for nested claim */
537 spin_unlock_irqrestore(&host
->lock
, flags
);
540 host
->claimer
= NULL
;
541 spin_unlock_irqrestore(&host
->lock
, flags
);
546 void mmc_host_deeper_disable(struct work_struct
*work
)
548 struct mmc_host
*host
=
549 container_of(work
, struct mmc_host
, disable
.work
);
551 /* If the host is claimed then we do not want to disable it anymore */
552 if (!mmc_try_claim_host(host
))
554 mmc_host_do_disable(host
, 1);
555 mmc_do_release_host(host
);
559 * mmc_host_lazy_disable - lazily disable a host.
560 * @host: mmc host to disable
562 * Hosts that support power saving can use the 'enable' and 'disable'
563 * methods to exit and enter power saving states. For more information
564 * see comments for struct mmc_host_ops.
566 int mmc_host_lazy_disable(struct mmc_host
*host
)
568 if (!(host
->caps
& MMC_CAP_DISABLE
))
571 if (host
->en_dis_recurs
)
574 if (--host
->nesting_cnt
)
580 if (host
->disable_delay
) {
581 mmc_schedule_delayed_work(&host
->disable
,
582 msecs_to_jiffies(host
->disable_delay
));
585 return mmc_host_do_disable(host
, 1);
587 EXPORT_SYMBOL(mmc_host_lazy_disable
);
590 * mmc_release_host - release a host
591 * @host: mmc host to release
593 * Release a MMC host, allowing others to claim the host
594 * for their operations.
596 void mmc_release_host(struct mmc_host
*host
)
598 WARN_ON(!host
->claimed
);
600 mmc_host_lazy_disable(host
);
602 mmc_do_release_host(host
);
605 EXPORT_SYMBOL(mmc_release_host
);
608 * Internal function that does the actual ios call to the host driver,
609 * optionally printing some debug output.
611 static inline void mmc_set_ios(struct mmc_host
*host
)
613 struct mmc_ios
*ios
= &host
->ios
;
615 pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u "
616 "width %u timing %u\n",
617 mmc_hostname(host
), ios
->clock
, ios
->bus_mode
,
618 ios
->power_mode
, ios
->chip_select
, ios
->vdd
,
619 ios
->bus_width
, ios
->timing
);
622 mmc_set_ungated(host
);
623 host
->ops
->set_ios(host
, ios
);
627 * Control chip select pin on a host.
629 void mmc_set_chip_select(struct mmc_host
*host
, int mode
)
631 host
->ios
.chip_select
= mode
;
636 * Sets the host clock to the highest possible frequency that
639 void mmc_set_clock(struct mmc_host
*host
, unsigned int hz
)
641 WARN_ON(hz
< host
->f_min
);
643 if (hz
> host
->f_max
)
646 host
->ios
.clock
= hz
;
650 #ifdef CONFIG_MMC_CLKGATE
652 * This gates the clock by setting it to 0 Hz.
654 void mmc_gate_clock(struct mmc_host
*host
)
658 spin_lock_irqsave(&host
->clk_lock
, flags
);
659 host
->clk_old
= host
->ios
.clock
;
661 host
->clk_gated
= true;
662 spin_unlock_irqrestore(&host
->clk_lock
, flags
);
667 * This restores the clock from gating by using the cached
670 void mmc_ungate_clock(struct mmc_host
*host
)
673 * We should previously have gated the clock, so the clock shall
674 * be 0 here! The clock may however be 0 during initialization,
675 * when some request operations are performed before setting
676 * the frequency. When ungate is requested in that situation
677 * we just ignore the call.
680 BUG_ON(host
->ios
.clock
);
681 /* This call will also set host->clk_gated to false */
682 mmc_set_clock(host
, host
->clk_old
);
686 void mmc_set_ungated(struct mmc_host
*host
)
691 * We've been given a new frequency while the clock is gated,
692 * so make sure we regard this as ungating it.
694 spin_lock_irqsave(&host
->clk_lock
, flags
);
695 host
->clk_gated
= false;
696 spin_unlock_irqrestore(&host
->clk_lock
, flags
);
700 void mmc_set_ungated(struct mmc_host
*host
)
706 * Change the bus mode (open drain/push-pull) of a host.
708 void mmc_set_bus_mode(struct mmc_host
*host
, unsigned int mode
)
710 host
->ios
.bus_mode
= mode
;
715 * Change data bus width and DDR mode of a host.
717 void mmc_set_bus_width_ddr(struct mmc_host
*host
, unsigned int width
,
720 host
->ios
.bus_width
= width
;
726 * Change data bus width of a host.
728 void mmc_set_bus_width(struct mmc_host
*host
, unsigned int width
)
730 mmc_set_bus_width_ddr(host
, width
, MMC_SDR_MODE
);
734 * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number
736 * @low_bits: prefer low bits in boundary cases
738 * This function returns the OCR bit number according to the provided @vdd
739 * value. If conversion is not possible a negative errno value returned.
741 * Depending on the @low_bits flag the function prefers low or high OCR bits
742 * on boundary voltages. For example,
743 * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33);
744 * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34);
746 * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21).
748 static int mmc_vdd_to_ocrbitnum(int vdd
, bool low_bits
)
750 const int max_bit
= ilog2(MMC_VDD_35_36
);
753 if (vdd
< 1650 || vdd
> 3600)
756 if (vdd
>= 1650 && vdd
<= 1950)
757 return ilog2(MMC_VDD_165_195
);
762 /* Base 2000 mV, step 100 mV, bit's base 8. */
763 bit
= (vdd
- 2000) / 100 + 8;
770 * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask
771 * @vdd_min: minimum voltage value (mV)
772 * @vdd_max: maximum voltage value (mV)
774 * This function returns the OCR mask bits according to the provided @vdd_min
775 * and @vdd_max values. If conversion is not possible the function returns 0.
777 * Notes wrt boundary cases:
778 * This function sets the OCR bits for all boundary voltages, for example
779 * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 |
780 * MMC_VDD_34_35 mask.
782 u32
mmc_vddrange_to_ocrmask(int vdd_min
, int vdd_max
)
786 if (vdd_max
< vdd_min
)
789 /* Prefer high bits for the boundary vdd_max values. */
790 vdd_max
= mmc_vdd_to_ocrbitnum(vdd_max
, false);
794 /* Prefer low bits for the boundary vdd_min values. */
795 vdd_min
= mmc_vdd_to_ocrbitnum(vdd_min
, true);
799 /* Fill the mask, from max bit to min bit. */
800 while (vdd_max
>= vdd_min
)
801 mask
|= 1 << vdd_max
--;
805 EXPORT_SYMBOL(mmc_vddrange_to_ocrmask
);
807 #ifdef CONFIG_REGULATOR
810 * mmc_regulator_get_ocrmask - return mask of supported voltages
811 * @supply: regulator to use
813 * This returns either a negative errno, or a mask of voltages that
814 * can be provided to MMC/SD/SDIO devices using the specified voltage
815 * regulator. This would normally be called before registering the
818 int mmc_regulator_get_ocrmask(struct regulator
*supply
)
824 count
= regulator_count_voltages(supply
);
828 for (i
= 0; i
< count
; i
++) {
832 vdd_uV
= regulator_list_voltage(supply
, i
);
836 vdd_mV
= vdd_uV
/ 1000;
837 result
|= mmc_vddrange_to_ocrmask(vdd_mV
, vdd_mV
);
842 EXPORT_SYMBOL(mmc_regulator_get_ocrmask
);
845 * mmc_regulator_set_ocr - set regulator to match host->ios voltage
846 * @mmc: the host to regulate
847 * @supply: regulator to use
848 * @vdd_bit: zero for power off, else a bit number (host->ios.vdd)
850 * Returns zero on success, else negative errno.
852 * MMC host drivers may use this to enable or disable a regulator using
853 * a particular supply voltage. This would normally be called from the
856 int mmc_regulator_set_ocr(struct mmc_host
*mmc
,
857 struct regulator
*supply
,
858 unsigned short vdd_bit
)
867 /* REVISIT mmc_vddrange_to_ocrmask() may have set some
868 * bits this regulator doesn't quite support ... don't
869 * be too picky, most cards and regulators are OK with
870 * a 0.1V range goof (it's a small error percentage).
872 tmp
= vdd_bit
- ilog2(MMC_VDD_165_195
);
874 min_uV
= 1650 * 1000;
875 max_uV
= 1950 * 1000;
877 min_uV
= 1900 * 1000 + tmp
* 100 * 1000;
878 max_uV
= min_uV
+ 100 * 1000;
881 /* avoid needless changes to this voltage; the regulator
882 * might not allow this operation
884 voltage
= regulator_get_voltage(supply
);
887 else if (voltage
< min_uV
|| voltage
> max_uV
)
888 result
= regulator_set_voltage(supply
, min_uV
, max_uV
);
892 if (result
== 0 && !mmc
->regulator_enabled
) {
893 result
= regulator_enable(supply
);
895 mmc
->regulator_enabled
= true;
897 } else if (mmc
->regulator_enabled
) {
898 result
= regulator_disable(supply
);
900 mmc
->regulator_enabled
= false;
904 dev_err(mmc_dev(mmc
),
905 "could not set regulator OCR (%d)\n", result
);
908 EXPORT_SYMBOL(mmc_regulator_set_ocr
);
910 #endif /* CONFIG_REGULATOR */
913 * Mask off any voltages we don't support and select
916 u32
mmc_select_voltage(struct mmc_host
*host
, u32 ocr
)
920 ocr
&= host
->ocr_avail
;
931 pr_warning("%s: host doesn't support card's voltages\n",
940 * Select timing parameters for host.
942 void mmc_set_timing(struct mmc_host
*host
, unsigned int timing
)
944 host
->ios
.timing
= timing
;
949 * Apply power to the MMC stack. This is a two-stage process.
950 * First, we enable power to the card without the clock running.
951 * We then wait a bit for the power to stabilise. Finally,
952 * enable the bus drivers and clock to the card.
954 * We must _NOT_ enable the clock prior to power stablising.
956 * If a host does all the power sequencing itself, ignore the
957 * initial MMC_POWER_UP stage.
959 static void mmc_power_up(struct mmc_host
*host
)
963 /* If ocr is set, we use it */
965 bit
= ffs(host
->ocr
) - 1;
967 bit
= fls(host
->ocr_avail
) - 1;
970 if (mmc_host_is_spi(host
)) {
971 host
->ios
.chip_select
= MMC_CS_HIGH
;
972 host
->ios
.bus_mode
= MMC_BUSMODE_PUSHPULL
;
974 host
->ios
.chip_select
= MMC_CS_DONTCARE
;
975 host
->ios
.bus_mode
= MMC_BUSMODE_OPENDRAIN
;
977 host
->ios
.power_mode
= MMC_POWER_UP
;
978 host
->ios
.bus_width
= MMC_BUS_WIDTH_1
;
979 host
->ios
.timing
= MMC_TIMING_LEGACY
;
983 * This delay should be sufficient to allow the power supply
984 * to reach the minimum voltage.
988 host
->ios
.clock
= host
->f_init
;
990 host
->ios
.power_mode
= MMC_POWER_ON
;
994 * This delay must be at least 74 clock sizes, or 1 ms, or the
995 * time required to reach a stable voltage.
1000 static void mmc_power_off(struct mmc_host
*host
)
1002 host
->ios
.clock
= 0;
1004 if (!mmc_host_is_spi(host
)) {
1005 host
->ios
.bus_mode
= MMC_BUSMODE_OPENDRAIN
;
1006 host
->ios
.chip_select
= MMC_CS_DONTCARE
;
1008 host
->ios
.power_mode
= MMC_POWER_OFF
;
1009 host
->ios
.bus_width
= MMC_BUS_WIDTH_1
;
1010 host
->ios
.timing
= MMC_TIMING_LEGACY
;
1015 * Cleanup when the last reference to the bus operator is dropped.
1017 static void __mmc_release_bus(struct mmc_host
*host
)
1020 BUG_ON(host
->bus_refs
);
1021 BUG_ON(!host
->bus_dead
);
1023 host
->bus_ops
= NULL
;
1027 * Increase reference count of bus operator
1029 static inline void mmc_bus_get(struct mmc_host
*host
)
1031 unsigned long flags
;
1033 spin_lock_irqsave(&host
->lock
, flags
);
1035 spin_unlock_irqrestore(&host
->lock
, flags
);
1039 * Decrease reference count of bus operator and free it if
1040 * it is the last reference.
1042 static inline void mmc_bus_put(struct mmc_host
*host
)
1044 unsigned long flags
;
1046 spin_lock_irqsave(&host
->lock
, flags
);
1048 if ((host
->bus_refs
== 0) && host
->bus_ops
)
1049 __mmc_release_bus(host
);
1050 spin_unlock_irqrestore(&host
->lock
, flags
);
1054 * Assign a mmc bus handler to a host. Only one bus handler may control a
1055 * host at any given time.
1057 void mmc_attach_bus(struct mmc_host
*host
, const struct mmc_bus_ops
*ops
)
1059 unsigned long flags
;
1064 WARN_ON(!host
->claimed
);
1066 spin_lock_irqsave(&host
->lock
, flags
);
1068 BUG_ON(host
->bus_ops
);
1069 BUG_ON(host
->bus_refs
);
1071 host
->bus_ops
= ops
;
1075 spin_unlock_irqrestore(&host
->lock
, flags
);
1079 * Remove the current bus handler from a host. Assumes that there are
1080 * no interesting cards left, so the bus is powered down.
1082 void mmc_detach_bus(struct mmc_host
*host
)
1084 unsigned long flags
;
1088 WARN_ON(!host
->claimed
);
1089 WARN_ON(!host
->bus_ops
);
1091 spin_lock_irqsave(&host
->lock
, flags
);
1095 spin_unlock_irqrestore(&host
->lock
, flags
);
1097 mmc_power_off(host
);
1103 * mmc_detect_change - process change of state on a MMC socket
1104 * @host: host which changed state.
1105 * @delay: optional delay to wait before detection (jiffies)
1107 * MMC drivers should call this when they detect a card has been
1108 * inserted or removed. The MMC layer will confirm that any
1109 * present card is still functional, and initialize any newly
1112 void mmc_detect_change(struct mmc_host
*host
, unsigned long delay
)
1114 #ifdef CONFIG_MMC_DEBUG
1115 unsigned long flags
;
1116 spin_lock_irqsave(&host
->lock
, flags
);
1117 WARN_ON(host
->removed
);
1118 spin_unlock_irqrestore(&host
->lock
, flags
);
1121 mmc_schedule_delayed_work(&host
->detect
, delay
);
1124 EXPORT_SYMBOL(mmc_detect_change
);
1126 void mmc_init_erase(struct mmc_card
*card
)
1130 if (is_power_of_2(card
->erase_size
))
1131 card
->erase_shift
= ffs(card
->erase_size
) - 1;
1133 card
->erase_shift
= 0;
1136 * It is possible to erase an arbitrarily large area of an SD or MMC
1137 * card. That is not desirable because it can take a long time
1138 * (minutes) potentially delaying more important I/O, and also the
1139 * timeout calculations become increasingly hugely over-estimated.
1140 * Consequently, 'pref_erase' is defined as a guide to limit erases
1141 * to that size and alignment.
1143 * For SD cards that define Allocation Unit size, limit erases to one
1144 * Allocation Unit at a time. For MMC cards that define High Capacity
1145 * Erase Size, whether it is switched on or not, limit to that size.
1146 * Otherwise just have a stab at a good value. For modern cards it
1147 * will end up being 4MiB. Note that if the value is too small, it
1148 * can end up taking longer to erase.
1150 if (mmc_card_sd(card
) && card
->ssr
.au
) {
1151 card
->pref_erase
= card
->ssr
.au
;
1152 card
->erase_shift
= ffs(card
->ssr
.au
) - 1;
1153 } else if (card
->ext_csd
.hc_erase_size
) {
1154 card
->pref_erase
= card
->ext_csd
.hc_erase_size
;
1156 sz
= (card
->csd
.capacity
<< (card
->csd
.read_blkbits
- 9)) >> 11;
1158 card
->pref_erase
= 512 * 1024 / 512;
1160 card
->pref_erase
= 1024 * 1024 / 512;
1162 card
->pref_erase
= 2 * 1024 * 1024 / 512;
1164 card
->pref_erase
= 4 * 1024 * 1024 / 512;
1165 if (card
->pref_erase
< card
->erase_size
)
1166 card
->pref_erase
= card
->erase_size
;
1168 sz
= card
->pref_erase
% card
->erase_size
;
1170 card
->pref_erase
+= card
->erase_size
- sz
;
1175 static void mmc_set_mmc_erase_timeout(struct mmc_card
*card
,
1176 struct mmc_command
*cmd
,
1177 unsigned int arg
, unsigned int qty
)
1179 unsigned int erase_timeout
;
1181 if (card
->ext_csd
.erase_group_def
& 1) {
1182 /* High Capacity Erase Group Size uses HC timeouts */
1183 if (arg
== MMC_TRIM_ARG
)
1184 erase_timeout
= card
->ext_csd
.trim_timeout
;
1186 erase_timeout
= card
->ext_csd
.hc_erase_timeout
;
1188 /* CSD Erase Group Size uses write timeout */
1189 unsigned int mult
= (10 << card
->csd
.r2w_factor
);
1190 unsigned int timeout_clks
= card
->csd
.tacc_clks
* mult
;
1191 unsigned int timeout_us
;
1193 /* Avoid overflow: e.g. tacc_ns=80000000 mult=1280 */
1194 if (card
->csd
.tacc_ns
< 1000000)
1195 timeout_us
= (card
->csd
.tacc_ns
* mult
) / 1000;
1197 timeout_us
= (card
->csd
.tacc_ns
/ 1000) * mult
;
1200 * ios.clock is only a target. The real clock rate might be
1201 * less but not that much less, so fudge it by multiplying by 2.
1204 timeout_us
+= (timeout_clks
* 1000) /
1205 (card
->host
->ios
.clock
/ 1000);
1207 erase_timeout
= timeout_us
/ 1000;
1210 * Theoretically, the calculation could underflow so round up
1211 * to 1ms in that case.
1217 /* Multiplier for secure operations */
1218 if (arg
& MMC_SECURE_ARGS
) {
1219 if (arg
== MMC_SECURE_ERASE_ARG
)
1220 erase_timeout
*= card
->ext_csd
.sec_erase_mult
;
1222 erase_timeout
*= card
->ext_csd
.sec_trim_mult
;
1225 erase_timeout
*= qty
;
1228 * Ensure at least a 1 second timeout for SPI as per
1229 * 'mmc_set_data_timeout()'
1231 if (mmc_host_is_spi(card
->host
) && erase_timeout
< 1000)
1232 erase_timeout
= 1000;
1234 cmd
->erase_timeout
= erase_timeout
;
1237 static void mmc_set_sd_erase_timeout(struct mmc_card
*card
,
1238 struct mmc_command
*cmd
, unsigned int arg
,
1241 if (card
->ssr
.erase_timeout
) {
1242 /* Erase timeout specified in SD Status Register (SSR) */
1243 cmd
->erase_timeout
= card
->ssr
.erase_timeout
* qty
+
1244 card
->ssr
.erase_offset
;
1247 * Erase timeout not specified in SD Status Register (SSR) so
1248 * use 250ms per write block.
1250 cmd
->erase_timeout
= 250 * qty
;
1253 /* Must not be less than 1 second */
1254 if (cmd
->erase_timeout
< 1000)
1255 cmd
->erase_timeout
= 1000;
1258 static void mmc_set_erase_timeout(struct mmc_card
*card
,
1259 struct mmc_command
*cmd
, unsigned int arg
,
1262 if (mmc_card_sd(card
))
1263 mmc_set_sd_erase_timeout(card
, cmd
, arg
, qty
);
1265 mmc_set_mmc_erase_timeout(card
, cmd
, arg
, qty
);
1268 static int mmc_do_erase(struct mmc_card
*card
, unsigned int from
,
1269 unsigned int to
, unsigned int arg
)
1271 struct mmc_command cmd
;
1272 unsigned int qty
= 0;
1276 * qty is used to calculate the erase timeout which depends on how many
1277 * erase groups (or allocation units in SD terminology) are affected.
1278 * We count erasing part of an erase group as one erase group.
1279 * For SD, the allocation units are always a power of 2. For MMC, the
1280 * erase group size is almost certainly also power of 2, but it does not
1281 * seem to insist on that in the JEDEC standard, so we fall back to
1282 * division in that case. SD may not specify an allocation unit size,
1283 * in which case the timeout is based on the number of write blocks.
1285 * Note that the timeout for secure trim 2 will only be correct if the
1286 * number of erase groups specified is the same as the total of all
1287 * preceding secure trim 1 commands. Since the power may have been
1288 * lost since the secure trim 1 commands occurred, it is generally
1289 * impossible to calculate the secure trim 2 timeout correctly.
1291 if (card
->erase_shift
)
1292 qty
+= ((to
>> card
->erase_shift
) -
1293 (from
>> card
->erase_shift
)) + 1;
1294 else if (mmc_card_sd(card
))
1295 qty
+= to
- from
+ 1;
1297 qty
+= ((to
/ card
->erase_size
) -
1298 (from
/ card
->erase_size
)) + 1;
1300 if (!mmc_card_blockaddr(card
)) {
1305 memset(&cmd
, 0, sizeof(struct mmc_command
));
1306 if (mmc_card_sd(card
))
1307 cmd
.opcode
= SD_ERASE_WR_BLK_START
;
1309 cmd
.opcode
= MMC_ERASE_GROUP_START
;
1311 cmd
.flags
= MMC_RSP_SPI_R1
| MMC_RSP_R1
| MMC_CMD_AC
;
1312 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 0);
1314 printk(KERN_ERR
"mmc_erase: group start error %d, "
1315 "status %#x\n", err
, cmd
.resp
[0]);
1320 memset(&cmd
, 0, sizeof(struct mmc_command
));
1321 if (mmc_card_sd(card
))
1322 cmd
.opcode
= SD_ERASE_WR_BLK_END
;
1324 cmd
.opcode
= MMC_ERASE_GROUP_END
;
1326 cmd
.flags
= MMC_RSP_SPI_R1
| MMC_RSP_R1
| MMC_CMD_AC
;
1327 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 0);
1329 printk(KERN_ERR
"mmc_erase: group end error %d, status %#x\n",
1335 memset(&cmd
, 0, sizeof(struct mmc_command
));
1336 cmd
.opcode
= MMC_ERASE
;
1338 cmd
.flags
= MMC_RSP_SPI_R1B
| MMC_RSP_R1B
| MMC_CMD_AC
;
1339 mmc_set_erase_timeout(card
, &cmd
, arg
, qty
);
1340 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 0);
1342 printk(KERN_ERR
"mmc_erase: erase error %d, status %#x\n",
1348 if (mmc_host_is_spi(card
->host
))
1352 memset(&cmd
, 0, sizeof(struct mmc_command
));
1353 cmd
.opcode
= MMC_SEND_STATUS
;
1354 cmd
.arg
= card
->rca
<< 16;
1355 cmd
.flags
= MMC_RSP_R1
| MMC_CMD_AC
;
1356 /* Do not retry else we can't see errors */
1357 err
= mmc_wait_for_cmd(card
->host
, &cmd
, 0);
1358 if (err
|| (cmd
.resp
[0] & 0xFDF92000)) {
1359 printk(KERN_ERR
"error %d requesting status %#x\n",
1364 } while (!(cmd
.resp
[0] & R1_READY_FOR_DATA
) ||
1365 R1_CURRENT_STATE(cmd
.resp
[0]) == 7);
1371 * mmc_erase - erase sectors.
1372 * @card: card to erase
1373 * @from: first sector to erase
1374 * @nr: number of sectors to erase
1375 * @arg: erase command argument (SD supports only %MMC_ERASE_ARG)
1377 * Caller must claim host before calling this function.
1379 int mmc_erase(struct mmc_card
*card
, unsigned int from
, unsigned int nr
,
1382 unsigned int rem
, to
= from
+ nr
;
1384 if (!(card
->host
->caps
& MMC_CAP_ERASE
) ||
1385 !(card
->csd
.cmdclass
& CCC_ERASE
))
1388 if (!card
->erase_size
)
1391 if (mmc_card_sd(card
) && arg
!= MMC_ERASE_ARG
)
1394 if ((arg
& MMC_SECURE_ARGS
) &&
1395 !(card
->ext_csd
.sec_feature_support
& EXT_CSD_SEC_ER_EN
))
1398 if ((arg
& MMC_TRIM_ARGS
) &&
1399 !(card
->ext_csd
.sec_feature_support
& EXT_CSD_SEC_GB_CL_EN
))
1402 if (arg
== MMC_SECURE_ERASE_ARG
) {
1403 if (from
% card
->erase_size
|| nr
% card
->erase_size
)
1407 if (arg
== MMC_ERASE_ARG
) {
1408 rem
= from
% card
->erase_size
;
1410 rem
= card
->erase_size
- rem
;
1417 rem
= nr
% card
->erase_size
;
1430 /* 'from' and 'to' are inclusive */
1433 return mmc_do_erase(card
, from
, to
, arg
);
1435 EXPORT_SYMBOL(mmc_erase
);
1437 int mmc_can_erase(struct mmc_card
*card
)
1439 if ((card
->host
->caps
& MMC_CAP_ERASE
) &&
1440 (card
->csd
.cmdclass
& CCC_ERASE
) && card
->erase_size
)
1444 EXPORT_SYMBOL(mmc_can_erase
);
1446 int mmc_can_trim(struct mmc_card
*card
)
1448 if (card
->ext_csd
.sec_feature_support
& EXT_CSD_SEC_GB_CL_EN
)
1452 EXPORT_SYMBOL(mmc_can_trim
);
1454 int mmc_can_secure_erase_trim(struct mmc_card
*card
)
1456 if (card
->ext_csd
.sec_feature_support
& EXT_CSD_SEC_ER_EN
)
1460 EXPORT_SYMBOL(mmc_can_secure_erase_trim
);
1462 int mmc_erase_group_aligned(struct mmc_card
*card
, unsigned int from
,
1465 if (!card
->erase_size
)
1467 if (from
% card
->erase_size
|| nr
% card
->erase_size
)
1471 EXPORT_SYMBOL(mmc_erase_group_aligned
);
1473 int mmc_set_blocklen(struct mmc_card
*card
, unsigned int blocklen
)
1475 struct mmc_command cmd
;
1477 if (mmc_card_blockaddr(card
) || mmc_card_ddr_mode(card
))
1480 memset(&cmd
, 0, sizeof(struct mmc_command
));
1481 cmd
.opcode
= MMC_SET_BLOCKLEN
;
1483 cmd
.flags
= MMC_RSP_SPI_R1
| MMC_RSP_R1
| MMC_CMD_AC
;
1484 return mmc_wait_for_cmd(card
->host
, &cmd
, 5);
1486 EXPORT_SYMBOL(mmc_set_blocklen
);
1488 static int mmc_rescan_try_freq(struct mmc_host
*host
, unsigned freq
)
1490 host
->f_init
= freq
;
1492 #ifdef CONFIG_MMC_DEBUG
1493 pr_info("%s: %s: trying to init card at %u Hz\n",
1494 mmc_hostname(host
), __func__
, host
->f_init
);
1500 mmc_send_if_cond(host
, host
->ocr_avail
);
1502 /* Order's important: probe SDIO, then SD, then MMC */
1503 if (!mmc_attach_sdio(host
))
1505 if (!mmc_attach_sd(host
))
1507 if (!mmc_attach_mmc(host
))
1510 mmc_power_off(host
);
1514 void mmc_rescan(struct work_struct
*work
)
1516 static const unsigned freqs
[] = { 400000, 300000, 200000, 100000 };
1517 struct mmc_host
*host
=
1518 container_of(work
, struct mmc_host
, detect
.work
);
1521 if (host
->rescan_disable
)
1527 * if there is a _removable_ card registered, check whether it is
1530 if (host
->bus_ops
&& host
->bus_ops
->detect
&& !host
->bus_dead
1531 && mmc_card_is_removable(host
))
1532 host
->bus_ops
->detect(host
);
1535 * Let mmc_bus_put() free the bus/bus_ops if we've found that
1536 * the card is no longer present.
1541 /* if there still is a card present, stop here */
1542 if (host
->bus_ops
!= NULL
) {
1548 * Only we can add a new handler, so it's safe to
1549 * release the lock here.
1553 if (host
->ops
->get_cd
&& host
->ops
->get_cd(host
) == 0)
1556 mmc_claim_host(host
);
1557 for (i
= 0; i
< ARRAY_SIZE(freqs
); i
++) {
1558 if (!mmc_rescan_try_freq(host
, max(freqs
[i
], host
->f_min
)))
1560 if (freqs
[i
] < host
->f_min
)
1563 mmc_release_host(host
);
1566 if (host
->caps
& MMC_CAP_NEEDS_POLL
)
1567 mmc_schedule_delayed_work(&host
->detect
, HZ
);
1570 void mmc_start_host(struct mmc_host
*host
)
1572 mmc_power_off(host
);
1573 mmc_detect_change(host
, 0);
1576 void mmc_stop_host(struct mmc_host
*host
)
1578 #ifdef CONFIG_MMC_DEBUG
1579 unsigned long flags
;
1580 spin_lock_irqsave(&host
->lock
, flags
);
1582 spin_unlock_irqrestore(&host
->lock
, flags
);
1585 if (host
->caps
& MMC_CAP_DISABLE
)
1586 cancel_delayed_work(&host
->disable
);
1587 cancel_delayed_work_sync(&host
->detect
);
1588 mmc_flush_scheduled_work();
1590 /* clear pm flags now and let card drivers set them as needed */
1594 if (host
->bus_ops
&& !host
->bus_dead
) {
1595 if (host
->bus_ops
->remove
)
1596 host
->bus_ops
->remove(host
);
1598 mmc_claim_host(host
);
1599 mmc_detach_bus(host
);
1600 mmc_release_host(host
);
1608 mmc_power_off(host
);
1611 int mmc_power_save_host(struct mmc_host
*host
)
1617 if (!host
->bus_ops
|| host
->bus_dead
|| !host
->bus_ops
->power_restore
) {
1622 if (host
->bus_ops
->power_save
)
1623 ret
= host
->bus_ops
->power_save(host
);
1627 mmc_power_off(host
);
1631 EXPORT_SYMBOL(mmc_power_save_host
);
1633 int mmc_power_restore_host(struct mmc_host
*host
)
1639 if (!host
->bus_ops
|| host
->bus_dead
|| !host
->bus_ops
->power_restore
) {
1645 ret
= host
->bus_ops
->power_restore(host
);
1651 EXPORT_SYMBOL(mmc_power_restore_host
);
1653 int mmc_card_awake(struct mmc_host
*host
)
1659 if (host
->bus_ops
&& !host
->bus_dead
&& host
->bus_ops
->awake
)
1660 err
= host
->bus_ops
->awake(host
);
1666 EXPORT_SYMBOL(mmc_card_awake
);
1668 int mmc_card_sleep(struct mmc_host
*host
)
1674 if (host
->bus_ops
&& !host
->bus_dead
&& host
->bus_ops
->awake
)
1675 err
= host
->bus_ops
->sleep(host
);
1681 EXPORT_SYMBOL(mmc_card_sleep
);
1683 int mmc_card_can_sleep(struct mmc_host
*host
)
1685 struct mmc_card
*card
= host
->card
;
1687 if (card
&& mmc_card_mmc(card
) && card
->ext_csd
.rev
>= 3)
1691 EXPORT_SYMBOL(mmc_card_can_sleep
);
1696 * mmc_suspend_host - suspend a host
1699 int mmc_suspend_host(struct mmc_host
*host
)
1703 if (host
->caps
& MMC_CAP_DISABLE
)
1704 cancel_delayed_work(&host
->disable
);
1705 cancel_delayed_work(&host
->detect
);
1706 mmc_flush_scheduled_work();
1709 if (host
->bus_ops
&& !host
->bus_dead
) {
1710 if (host
->bus_ops
->suspend
)
1711 err
= host
->bus_ops
->suspend(host
);
1712 if (err
== -ENOSYS
|| !host
->bus_ops
->resume
) {
1714 * We simply "remove" the card in this case.
1715 * It will be redetected on resume.
1717 if (host
->bus_ops
->remove
)
1718 host
->bus_ops
->remove(host
);
1719 mmc_claim_host(host
);
1720 mmc_detach_bus(host
);
1721 mmc_release_host(host
);
1728 if (!err
&& !(host
->pm_flags
& MMC_PM_KEEP_POWER
))
1729 mmc_power_off(host
);
1734 EXPORT_SYMBOL(mmc_suspend_host
);
1737 * mmc_resume_host - resume a previously suspended host
1740 int mmc_resume_host(struct mmc_host
*host
)
1745 if (host
->bus_ops
&& !host
->bus_dead
) {
1746 if (!(host
->pm_flags
& MMC_PM_KEEP_POWER
)) {
1748 mmc_select_voltage(host
, host
->ocr
);
1750 * Tell runtime PM core we just powered up the card,
1751 * since it still believes the card is powered off.
1752 * Note that currently runtime PM is only enabled
1753 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
1755 if (mmc_card_sdio(host
->card
) &&
1756 (host
->caps
& MMC_CAP_POWER_OFF_CARD
)) {
1757 pm_runtime_disable(&host
->card
->dev
);
1758 pm_runtime_set_active(&host
->card
->dev
);
1759 pm_runtime_enable(&host
->card
->dev
);
1762 BUG_ON(!host
->bus_ops
->resume
);
1763 err
= host
->bus_ops
->resume(host
);
1765 printk(KERN_WARNING
"%s: error %d during resume "
1766 "(card was removed?)\n",
1767 mmc_hostname(host
), err
);
1775 EXPORT_SYMBOL(mmc_resume_host
);
1777 /* Do the card removal on suspend if card is assumed removeable
1778 * Do that in pm notifier while userspace isn't yet frozen, so we will be able
1781 int mmc_pm_notify(struct notifier_block
*notify_block
,
1782 unsigned long mode
, void *unused
)
1784 struct mmc_host
*host
= container_of(
1785 notify_block
, struct mmc_host
, pm_notify
);
1786 unsigned long flags
;
1790 case PM_HIBERNATION_PREPARE
:
1791 case PM_SUSPEND_PREPARE
:
1793 spin_lock_irqsave(&host
->lock
, flags
);
1794 host
->rescan_disable
= 1;
1795 spin_unlock_irqrestore(&host
->lock
, flags
);
1796 cancel_delayed_work_sync(&host
->detect
);
1798 if (!host
->bus_ops
|| host
->bus_ops
->suspend
)
1801 mmc_claim_host(host
);
1803 if (host
->bus_ops
->remove
)
1804 host
->bus_ops
->remove(host
);
1806 mmc_detach_bus(host
);
1807 mmc_release_host(host
);
1811 case PM_POST_SUSPEND
:
1812 case PM_POST_HIBERNATION
:
1813 case PM_POST_RESTORE
:
1815 spin_lock_irqsave(&host
->lock
, flags
);
1816 host
->rescan_disable
= 0;
1817 spin_unlock_irqrestore(&host
->lock
, flags
);
1818 mmc_detect_change(host
, 0);
1826 static int __init
mmc_init(void)
1830 workqueue
= alloc_ordered_workqueue("kmmcd", 0);
1834 ret
= mmc_register_bus();
1836 goto destroy_workqueue
;
1838 ret
= mmc_register_host_class();
1840 goto unregister_bus
;
1842 ret
= sdio_register_bus();
1844 goto unregister_host_class
;
1848 unregister_host_class
:
1849 mmc_unregister_host_class();
1851 mmc_unregister_bus();
1853 destroy_workqueue(workqueue
);
1858 static void __exit
mmc_exit(void)
1860 sdio_unregister_bus();
1861 mmc_unregister_host_class();
1862 mmc_unregister_bus();
1863 destroy_workqueue(workqueue
);
1866 subsys_initcall(mmc_init
);
1867 module_exit(mmc_exit
);
1869 MODULE_LICENSE("GPL");