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>
26 #include <linux/mmc/card.h>
27 #include <linux/mmc/host.h>
28 #include <linux/mmc/mmc.h>
29 #include <linux/mmc/sd.h>
40 static struct workqueue_struct
*workqueue
;
43 * Enabling software CRCs on the data blocks can be a significant (30%)
44 * performance cost, and for other reasons may not always be desired.
45 * So we allow it it to be disabled.
48 module_param(use_spi_crc
, bool, 0);
51 * Internal function. Schedule delayed work in the MMC work queue.
53 static int mmc_schedule_delayed_work(struct delayed_work
*work
,
56 return queue_delayed_work(workqueue
, work
, delay
);
60 * Internal function. Flush all scheduled work from the MMC work queue.
62 static void mmc_flush_scheduled_work(void)
64 flush_workqueue(workqueue
);
68 * mmc_request_done - finish processing an MMC request
69 * @host: MMC host which completed request
70 * @mrq: MMC request which request
72 * MMC drivers should call this function when they have completed
73 * their processing of a request.
75 void mmc_request_done(struct mmc_host
*host
, struct mmc_request
*mrq
)
77 struct mmc_command
*cmd
= mrq
->cmd
;
80 if (err
&& cmd
->retries
&& mmc_host_is_spi(host
)) {
81 if (cmd
->resp
[0] & R1_SPI_ILLEGAL_COMMAND
)
85 if (err
&& cmd
->retries
) {
86 pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
87 mmc_hostname(host
), cmd
->opcode
, err
);
91 host
->ops
->request(host
, mrq
);
93 led_trigger_event(host
->led
, LED_OFF
);
95 pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n",
96 mmc_hostname(host
), cmd
->opcode
, err
,
97 cmd
->resp
[0], cmd
->resp
[1],
98 cmd
->resp
[2], cmd
->resp
[3]);
101 pr_debug("%s: %d bytes transferred: %d\n",
103 mrq
->data
->bytes_xfered
, mrq
->data
->error
);
107 pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n",
108 mmc_hostname(host
), mrq
->stop
->opcode
,
110 mrq
->stop
->resp
[0], mrq
->stop
->resp
[1],
111 mrq
->stop
->resp
[2], mrq
->stop
->resp
[3]);
119 EXPORT_SYMBOL(mmc_request_done
);
122 mmc_start_request(struct mmc_host
*host
, struct mmc_request
*mrq
)
124 #ifdef CONFIG_MMC_DEBUG
126 struct scatterlist
*sg
;
129 pr_debug("%s: starting CMD%u arg %08x flags %08x\n",
130 mmc_hostname(host
), mrq
->cmd
->opcode
,
131 mrq
->cmd
->arg
, mrq
->cmd
->flags
);
134 pr_debug("%s: blksz %d blocks %d flags %08x "
135 "tsac %d ms nsac %d\n",
136 mmc_hostname(host
), mrq
->data
->blksz
,
137 mrq
->data
->blocks
, mrq
->data
->flags
,
138 mrq
->data
->timeout_ns
/ 1000000,
139 mrq
->data
->timeout_clks
);
143 pr_debug("%s: CMD%u arg %08x flags %08x\n",
144 mmc_hostname(host
), mrq
->stop
->opcode
,
145 mrq
->stop
->arg
, mrq
->stop
->flags
);
148 WARN_ON(!host
->claimed
);
150 led_trigger_event(host
->led
, LED_FULL
);
155 BUG_ON(mrq
->data
->blksz
> host
->max_blk_size
);
156 BUG_ON(mrq
->data
->blocks
> host
->max_blk_count
);
157 BUG_ON(mrq
->data
->blocks
* mrq
->data
->blksz
>
160 #ifdef CONFIG_MMC_DEBUG
162 for_each_sg(mrq
->data
->sg
, sg
, mrq
->data
->sg_len
, i
)
164 BUG_ON(sz
!= mrq
->data
->blocks
* mrq
->data
->blksz
);
167 mrq
->cmd
->data
= mrq
->data
;
168 mrq
->data
->error
= 0;
169 mrq
->data
->mrq
= mrq
;
171 mrq
->data
->stop
= mrq
->stop
;
172 mrq
->stop
->error
= 0;
173 mrq
->stop
->mrq
= mrq
;
176 host
->ops
->request(host
, mrq
);
179 static void mmc_wait_done(struct mmc_request
*mrq
)
181 complete(mrq
->done_data
);
185 * mmc_wait_for_req - start a request and wait for completion
186 * @host: MMC host to start command
187 * @mrq: MMC request to start
189 * Start a new MMC custom command request for a host, and wait
190 * for the command to complete. Does not attempt to parse the
193 void mmc_wait_for_req(struct mmc_host
*host
, struct mmc_request
*mrq
)
195 DECLARE_COMPLETION_ONSTACK(complete
);
197 mrq
->done_data
= &complete
;
198 mrq
->done
= mmc_wait_done
;
200 mmc_start_request(host
, mrq
);
202 wait_for_completion(&complete
);
205 EXPORT_SYMBOL(mmc_wait_for_req
);
208 * mmc_wait_for_cmd - start a command and wait for completion
209 * @host: MMC host to start command
210 * @cmd: MMC command to start
211 * @retries: maximum number of retries
213 * Start a new MMC command for a host, and wait for the command
214 * to complete. Return any error that occurred while the command
215 * was executing. Do not attempt to parse the response.
217 int mmc_wait_for_cmd(struct mmc_host
*host
, struct mmc_command
*cmd
, int retries
)
219 struct mmc_request mrq
;
221 WARN_ON(!host
->claimed
);
223 memset(&mrq
, 0, sizeof(struct mmc_request
));
225 memset(cmd
->resp
, 0, sizeof(cmd
->resp
));
226 cmd
->retries
= retries
;
231 mmc_wait_for_req(host
, &mrq
);
236 EXPORT_SYMBOL(mmc_wait_for_cmd
);
239 * mmc_set_data_timeout - set the timeout for a data command
240 * @data: data phase for command
241 * @card: the MMC card associated with the data transfer
243 * Computes the data timeout parameters according to the
244 * correct algorithm given the card type.
246 void mmc_set_data_timeout(struct mmc_data
*data
, const struct mmc_card
*card
)
251 * SDIO cards only define an upper 1 s limit on access.
253 if (mmc_card_sdio(card
)) {
254 data
->timeout_ns
= 1000000000;
255 data
->timeout_clks
= 0;
260 * SD cards use a 100 multiplier rather than 10
262 mult
= mmc_card_sd(card
) ? 100 : 10;
265 * Scale up the multiplier (and therefore the timeout) by
266 * the r2w factor for writes.
268 if (data
->flags
& MMC_DATA_WRITE
)
269 mult
<<= card
->csd
.r2w_factor
;
271 data
->timeout_ns
= card
->csd
.tacc_ns
* mult
;
272 data
->timeout_clks
= card
->csd
.tacc_clks
* mult
;
275 * SD cards also have an upper limit on the timeout.
277 if (mmc_card_sd(card
)) {
278 unsigned int timeout_us
, limit_us
;
280 timeout_us
= data
->timeout_ns
/ 1000;
281 timeout_us
+= data
->timeout_clks
* 1000 /
282 (card
->host
->ios
.clock
/ 1000);
284 if (data
->flags
& MMC_DATA_WRITE
)
286 * The limit is really 250 ms, but that is
287 * insufficient for some crappy cards.
294 * SDHC cards always use these fixed values.
296 if (timeout_us
> limit_us
|| mmc_card_blockaddr(card
)) {
297 data
->timeout_ns
= limit_us
* 1000;
298 data
->timeout_clks
= 0;
302 * Some cards need very high timeouts if driven in SPI mode.
303 * The worst observed timeout was 900ms after writing a
304 * continuous stream of data until the internal logic
307 if (mmc_host_is_spi(card
->host
)) {
308 if (data
->flags
& MMC_DATA_WRITE
) {
309 if (data
->timeout_ns
< 1000000000)
310 data
->timeout_ns
= 1000000000; /* 1s */
312 if (data
->timeout_ns
< 100000000)
313 data
->timeout_ns
= 100000000; /* 100ms */
317 EXPORT_SYMBOL(mmc_set_data_timeout
);
320 * mmc_align_data_size - pads a transfer size to a more optimal value
321 * @card: the MMC card associated with the data transfer
322 * @sz: original transfer size
324 * Pads the original data size with a number of extra bytes in
325 * order to avoid controller bugs and/or performance hits
326 * (e.g. some controllers revert to PIO for certain sizes).
328 * Returns the improved size, which might be unmodified.
330 * Note that this function is only relevant when issuing a
331 * single scatter gather entry.
333 unsigned int mmc_align_data_size(struct mmc_card
*card
, unsigned int sz
)
336 * FIXME: We don't have a system for the controller to tell
337 * the core about its problems yet, so for now we just 32-bit
340 sz
= ((sz
+ 3) / 4) * 4;
344 EXPORT_SYMBOL(mmc_align_data_size
);
347 * mmc_host_enable - enable a host.
348 * @host: mmc host to enable
350 * Hosts that support power saving can use the 'enable' and 'disable'
351 * methods to exit and enter power saving states. For more information
352 * see comments for struct mmc_host_ops.
354 int mmc_host_enable(struct mmc_host
*host
)
356 if (!(host
->caps
& MMC_CAP_DISABLE
))
359 if (host
->en_dis_recurs
)
362 if (host
->nesting_cnt
++)
365 cancel_delayed_work_sync(&host
->disable
);
370 if (host
->ops
->enable
) {
373 host
->en_dis_recurs
= 1;
374 err
= host
->ops
->enable(host
);
375 host
->en_dis_recurs
= 0;
378 pr_debug("%s: enable error %d\n",
379 mmc_hostname(host
), err
);
386 EXPORT_SYMBOL(mmc_host_enable
);
388 static int mmc_host_do_disable(struct mmc_host
*host
, int lazy
)
390 if (host
->ops
->disable
) {
393 host
->en_dis_recurs
= 1;
394 err
= host
->ops
->disable(host
, lazy
);
395 host
->en_dis_recurs
= 0;
398 pr_debug("%s: disable error %d\n",
399 mmc_hostname(host
), err
);
403 unsigned long delay
= msecs_to_jiffies(err
);
405 mmc_schedule_delayed_work(&host
->disable
, delay
);
413 * mmc_host_disable - disable a host.
414 * @host: mmc host to disable
416 * Hosts that support power saving can use the 'enable' and 'disable'
417 * methods to exit and enter power saving states. For more information
418 * see comments for struct mmc_host_ops.
420 int mmc_host_disable(struct mmc_host
*host
)
424 if (!(host
->caps
& MMC_CAP_DISABLE
))
427 if (host
->en_dis_recurs
)
430 if (--host
->nesting_cnt
)
436 err
= mmc_host_do_disable(host
, 0);
439 EXPORT_SYMBOL(mmc_host_disable
);
442 * __mmc_claim_host - exclusively claim a host
443 * @host: mmc host to claim
444 * @abort: whether or not the operation should be aborted
446 * Claim a host for a set of operations. If @abort is non null and
447 * dereference a non-zero value then this will return prematurely with
448 * that non-zero value without acquiring the lock. Returns zero
449 * with the lock held otherwise.
451 int __mmc_claim_host(struct mmc_host
*host
, atomic_t
*abort
)
453 DECLARE_WAITQUEUE(wait
, current
);
459 add_wait_queue(&host
->wq
, &wait
);
460 spin_lock_irqsave(&host
->lock
, flags
);
462 set_current_state(TASK_UNINTERRUPTIBLE
);
463 stop
= abort
? atomic_read(abort
) : 0;
464 if (stop
|| !host
->claimed
|| host
->claimer
== current
)
466 spin_unlock_irqrestore(&host
->lock
, flags
);
468 spin_lock_irqsave(&host
->lock
, flags
);
470 set_current_state(TASK_RUNNING
);
473 host
->claimer
= current
;
474 host
->claim_cnt
+= 1;
477 spin_unlock_irqrestore(&host
->lock
, flags
);
478 remove_wait_queue(&host
->wq
, &wait
);
480 mmc_host_enable(host
);
484 EXPORT_SYMBOL(__mmc_claim_host
);
487 * mmc_try_claim_host - try exclusively to claim a host
488 * @host: mmc host to claim
490 * Returns %1 if the host is claimed, %0 otherwise.
492 int mmc_try_claim_host(struct mmc_host
*host
)
494 int claimed_host
= 0;
497 spin_lock_irqsave(&host
->lock
, flags
);
498 if (!host
->claimed
|| host
->claimer
== current
) {
500 host
->claimer
= current
;
501 host
->claim_cnt
+= 1;
504 spin_unlock_irqrestore(&host
->lock
, flags
);
507 EXPORT_SYMBOL(mmc_try_claim_host
);
509 static void mmc_do_release_host(struct mmc_host
*host
)
513 spin_lock_irqsave(&host
->lock
, flags
);
514 if (--host
->claim_cnt
) {
515 /* Release for nested claim */
516 spin_unlock_irqrestore(&host
->lock
, flags
);
519 host
->claimer
= NULL
;
520 spin_unlock_irqrestore(&host
->lock
, flags
);
525 void mmc_host_deeper_disable(struct work_struct
*work
)
527 struct mmc_host
*host
=
528 container_of(work
, struct mmc_host
, disable
.work
);
530 /* If the host is claimed then we do not want to disable it anymore */
531 if (!mmc_try_claim_host(host
))
533 mmc_host_do_disable(host
, 1);
534 mmc_do_release_host(host
);
538 * mmc_host_lazy_disable - lazily disable a host.
539 * @host: mmc host to disable
541 * Hosts that support power saving can use the 'enable' and 'disable'
542 * methods to exit and enter power saving states. For more information
543 * see comments for struct mmc_host_ops.
545 int mmc_host_lazy_disable(struct mmc_host
*host
)
547 if (!(host
->caps
& MMC_CAP_DISABLE
))
550 if (host
->en_dis_recurs
)
553 if (--host
->nesting_cnt
)
559 if (host
->disable_delay
) {
560 mmc_schedule_delayed_work(&host
->disable
,
561 msecs_to_jiffies(host
->disable_delay
));
564 return mmc_host_do_disable(host
, 1);
566 EXPORT_SYMBOL(mmc_host_lazy_disable
);
569 * mmc_release_host - release a host
570 * @host: mmc host to release
572 * Release a MMC host, allowing others to claim the host
573 * for their operations.
575 void mmc_release_host(struct mmc_host
*host
)
577 WARN_ON(!host
->claimed
);
579 mmc_host_lazy_disable(host
);
581 mmc_do_release_host(host
);
584 EXPORT_SYMBOL(mmc_release_host
);
587 * Internal function that does the actual ios call to the host driver,
588 * optionally printing some debug output.
590 static inline void mmc_set_ios(struct mmc_host
*host
)
592 struct mmc_ios
*ios
= &host
->ios
;
594 pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u "
595 "width %u timing %u\n",
596 mmc_hostname(host
), ios
->clock
, ios
->bus_mode
,
597 ios
->power_mode
, ios
->chip_select
, ios
->vdd
,
598 ios
->bus_width
, ios
->timing
);
600 host
->ops
->set_ios(host
, ios
);
604 * Control chip select pin on a host.
606 void mmc_set_chip_select(struct mmc_host
*host
, int mode
)
608 host
->ios
.chip_select
= mode
;
613 * Sets the host clock to the highest possible frequency that
616 void mmc_set_clock(struct mmc_host
*host
, unsigned int hz
)
618 WARN_ON(hz
< host
->f_min
);
620 if (hz
> host
->f_max
)
623 host
->ios
.clock
= hz
;
628 * Change the bus mode (open drain/push-pull) of a host.
630 void mmc_set_bus_mode(struct mmc_host
*host
, unsigned int mode
)
632 host
->ios
.bus_mode
= mode
;
637 * Change data bus width of a host.
639 void mmc_set_bus_width(struct mmc_host
*host
, unsigned int width
)
641 host
->ios
.bus_width
= width
;
646 * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number
648 * @low_bits: prefer low bits in boundary cases
650 * This function returns the OCR bit number according to the provided @vdd
651 * value. If conversion is not possible a negative errno value returned.
653 * Depending on the @low_bits flag the function prefers low or high OCR bits
654 * on boundary voltages. For example,
655 * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33);
656 * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34);
658 * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21).
660 static int mmc_vdd_to_ocrbitnum(int vdd
, bool low_bits
)
662 const int max_bit
= ilog2(MMC_VDD_35_36
);
665 if (vdd
< 1650 || vdd
> 3600)
668 if (vdd
>= 1650 && vdd
<= 1950)
669 return ilog2(MMC_VDD_165_195
);
674 /* Base 2000 mV, step 100 mV, bit's base 8. */
675 bit
= (vdd
- 2000) / 100 + 8;
682 * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask
683 * @vdd_min: minimum voltage value (mV)
684 * @vdd_max: maximum voltage value (mV)
686 * This function returns the OCR mask bits according to the provided @vdd_min
687 * and @vdd_max values. If conversion is not possible the function returns 0.
689 * Notes wrt boundary cases:
690 * This function sets the OCR bits for all boundary voltages, for example
691 * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 |
692 * MMC_VDD_34_35 mask.
694 u32
mmc_vddrange_to_ocrmask(int vdd_min
, int vdd_max
)
698 if (vdd_max
< vdd_min
)
701 /* Prefer high bits for the boundary vdd_max values. */
702 vdd_max
= mmc_vdd_to_ocrbitnum(vdd_max
, false);
706 /* Prefer low bits for the boundary vdd_min values. */
707 vdd_min
= mmc_vdd_to_ocrbitnum(vdd_min
, true);
711 /* Fill the mask, from max bit to min bit. */
712 while (vdd_max
>= vdd_min
)
713 mask
|= 1 << vdd_max
--;
717 EXPORT_SYMBOL(mmc_vddrange_to_ocrmask
);
719 #ifdef CONFIG_REGULATOR
722 * mmc_regulator_get_ocrmask - return mask of supported voltages
723 * @supply: regulator to use
725 * This returns either a negative errno, or a mask of voltages that
726 * can be provided to MMC/SD/SDIO devices using the specified voltage
727 * regulator. This would normally be called before registering the
730 int mmc_regulator_get_ocrmask(struct regulator
*supply
)
736 count
= regulator_count_voltages(supply
);
740 for (i
= 0; i
< count
; i
++) {
744 vdd_uV
= regulator_list_voltage(supply
, i
);
748 vdd_mV
= vdd_uV
/ 1000;
749 result
|= mmc_vddrange_to_ocrmask(vdd_mV
, vdd_mV
);
754 EXPORT_SYMBOL(mmc_regulator_get_ocrmask
);
757 * mmc_regulator_set_ocr - set regulator to match host->ios voltage
758 * @vdd_bit: zero for power off, else a bit number (host->ios.vdd)
759 * @supply: regulator to use
761 * Returns zero on success, else negative errno.
763 * MMC host drivers may use this to enable or disable a regulator using
764 * a particular supply voltage. This would normally be called from the
767 int mmc_regulator_set_ocr(struct regulator
*supply
, unsigned short vdd_bit
)
773 enabled
= regulator_is_enabled(supply
);
781 /* REVISIT mmc_vddrange_to_ocrmask() may have set some
782 * bits this regulator doesn't quite support ... don't
783 * be too picky, most cards and regulators are OK with
784 * a 0.1V range goof (it's a small error percentage).
786 tmp
= vdd_bit
- ilog2(MMC_VDD_165_195
);
788 min_uV
= 1650 * 1000;
789 max_uV
= 1950 * 1000;
791 min_uV
= 1900 * 1000 + tmp
* 100 * 1000;
792 max_uV
= min_uV
+ 100 * 1000;
795 /* avoid needless changes to this voltage; the regulator
796 * might not allow this operation
798 voltage
= regulator_get_voltage(supply
);
801 else if (voltage
< min_uV
|| voltage
> max_uV
)
802 result
= regulator_set_voltage(supply
, min_uV
, max_uV
);
806 if (result
== 0 && !enabled
)
807 result
= regulator_enable(supply
);
808 } else if (enabled
) {
809 result
= regulator_disable(supply
);
814 EXPORT_SYMBOL(mmc_regulator_set_ocr
);
819 * Mask off any voltages we don't support and select
822 u32
mmc_select_voltage(struct mmc_host
*host
, u32 ocr
)
826 ocr
&= host
->ocr_avail
;
837 pr_warning("%s: host doesn't support card's voltages\n",
846 * Select timing parameters for host.
848 void mmc_set_timing(struct mmc_host
*host
, unsigned int timing
)
850 host
->ios
.timing
= timing
;
855 * Apply power to the MMC stack. This is a two-stage process.
856 * First, we enable power to the card without the clock running.
857 * We then wait a bit for the power to stabilise. Finally,
858 * enable the bus drivers and clock to the card.
860 * We must _NOT_ enable the clock prior to power stablising.
862 * If a host does all the power sequencing itself, ignore the
863 * initial MMC_POWER_UP stage.
865 static void mmc_power_up(struct mmc_host
*host
)
869 /* If ocr is set, we use it */
871 bit
= ffs(host
->ocr
) - 1;
873 bit
= fls(host
->ocr_avail
) - 1;
876 if (mmc_host_is_spi(host
)) {
877 host
->ios
.chip_select
= MMC_CS_HIGH
;
878 host
->ios
.bus_mode
= MMC_BUSMODE_PUSHPULL
;
880 host
->ios
.chip_select
= MMC_CS_DONTCARE
;
881 host
->ios
.bus_mode
= MMC_BUSMODE_OPENDRAIN
;
883 host
->ios
.power_mode
= MMC_POWER_UP
;
884 host
->ios
.bus_width
= MMC_BUS_WIDTH_1
;
885 host
->ios
.timing
= MMC_TIMING_LEGACY
;
889 * This delay should be sufficient to allow the power supply
890 * to reach the minimum voltage.
894 if (host
->f_min
> 400000) {
895 pr_warning("%s: Minimum clock frequency too high for "
896 "identification mode\n", mmc_hostname(host
));
897 host
->ios
.clock
= host
->f_min
;
899 host
->ios
.clock
= 400000;
901 host
->ios
.power_mode
= MMC_POWER_ON
;
905 * This delay must be at least 74 clock sizes, or 1 ms, or the
906 * time required to reach a stable voltage.
911 static void mmc_power_off(struct mmc_host
*host
)
915 if (!mmc_host_is_spi(host
)) {
916 host
->ios
.bus_mode
= MMC_BUSMODE_OPENDRAIN
;
917 host
->ios
.chip_select
= MMC_CS_DONTCARE
;
919 host
->ios
.power_mode
= MMC_POWER_OFF
;
920 host
->ios
.bus_width
= MMC_BUS_WIDTH_1
;
921 host
->ios
.timing
= MMC_TIMING_LEGACY
;
926 * Cleanup when the last reference to the bus operator is dropped.
928 static void __mmc_release_bus(struct mmc_host
*host
)
931 BUG_ON(host
->bus_refs
);
932 BUG_ON(!host
->bus_dead
);
934 host
->bus_ops
= NULL
;
938 * Increase reference count of bus operator
940 static inline void mmc_bus_get(struct mmc_host
*host
)
944 spin_lock_irqsave(&host
->lock
, flags
);
946 spin_unlock_irqrestore(&host
->lock
, flags
);
950 * Decrease reference count of bus operator and free it if
951 * it is the last reference.
953 static inline void mmc_bus_put(struct mmc_host
*host
)
957 spin_lock_irqsave(&host
->lock
, flags
);
959 if ((host
->bus_refs
== 0) && host
->bus_ops
)
960 __mmc_release_bus(host
);
961 spin_unlock_irqrestore(&host
->lock
, flags
);
965 * Assign a mmc bus handler to a host. Only one bus handler may control a
966 * host at any given time.
968 void mmc_attach_bus(struct mmc_host
*host
, const struct mmc_bus_ops
*ops
)
975 WARN_ON(!host
->claimed
);
977 spin_lock_irqsave(&host
->lock
, flags
);
979 BUG_ON(host
->bus_ops
);
980 BUG_ON(host
->bus_refs
);
986 spin_unlock_irqrestore(&host
->lock
, flags
);
990 * Remove the current bus handler from a host. Assumes that there are
991 * no interesting cards left, so the bus is powered down.
993 void mmc_detach_bus(struct mmc_host
*host
)
999 WARN_ON(!host
->claimed
);
1000 WARN_ON(!host
->bus_ops
);
1002 spin_lock_irqsave(&host
->lock
, flags
);
1006 spin_unlock_irqrestore(&host
->lock
, flags
);
1008 mmc_power_off(host
);
1014 * mmc_detect_change - process change of state on a MMC socket
1015 * @host: host which changed state.
1016 * @delay: optional delay to wait before detection (jiffies)
1018 * MMC drivers should call this when they detect a card has been
1019 * inserted or removed. The MMC layer will confirm that any
1020 * present card is still functional, and initialize any newly
1023 void mmc_detect_change(struct mmc_host
*host
, unsigned long delay
)
1025 #ifdef CONFIG_MMC_DEBUG
1026 unsigned long flags
;
1027 spin_lock_irqsave(&host
->lock
, flags
);
1028 WARN_ON(host
->removed
);
1029 spin_unlock_irqrestore(&host
->lock
, flags
);
1032 mmc_schedule_delayed_work(&host
->detect
, delay
);
1035 EXPORT_SYMBOL(mmc_detect_change
);
1038 void mmc_rescan(struct work_struct
*work
)
1040 struct mmc_host
*host
=
1041 container_of(work
, struct mmc_host
, detect
.work
);
1047 /* if there is a card registered, check whether it is still present */
1048 if ((host
->bus_ops
!= NULL
) && host
->bus_ops
->detect
&& !host
->bus_dead
)
1049 host
->bus_ops
->detect(host
);
1056 /* if there still is a card present, stop here */
1057 if (host
->bus_ops
!= NULL
) {
1062 /* detect a newly inserted card */
1065 * Only we can add a new handler, so it's safe to
1066 * release the lock here.
1070 if (host
->ops
->get_cd
&& host
->ops
->get_cd(host
) == 0)
1073 mmc_claim_host(host
);
1078 mmc_send_if_cond(host
, host
->ocr_avail
);
1081 * First we search for SDIO...
1083 err
= mmc_send_io_op_cond(host
, 0, &ocr
);
1085 if (mmc_attach_sdio(host
, ocr
))
1086 mmc_power_off(host
);
1091 * ...then normal SD...
1093 err
= mmc_send_app_op_cond(host
, 0, &ocr
);
1095 if (mmc_attach_sd(host
, ocr
))
1096 mmc_power_off(host
);
1101 * ...and finally MMC.
1103 err
= mmc_send_op_cond(host
, 0, &ocr
);
1105 if (mmc_attach_mmc(host
, ocr
))
1106 mmc_power_off(host
);
1110 mmc_release_host(host
);
1111 mmc_power_off(host
);
1114 if (host
->caps
& MMC_CAP_NEEDS_POLL
)
1115 mmc_schedule_delayed_work(&host
->detect
, HZ
);
1118 void mmc_start_host(struct mmc_host
*host
)
1120 mmc_power_off(host
);
1121 mmc_detect_change(host
, 0);
1124 void mmc_stop_host(struct mmc_host
*host
)
1126 #ifdef CONFIG_MMC_DEBUG
1127 unsigned long flags
;
1128 spin_lock_irqsave(&host
->lock
, flags
);
1130 spin_unlock_irqrestore(&host
->lock
, flags
);
1133 if (host
->caps
& MMC_CAP_DISABLE
)
1134 cancel_delayed_work(&host
->disable
);
1135 cancel_delayed_work(&host
->detect
);
1136 mmc_flush_scheduled_work();
1139 if (host
->bus_ops
&& !host
->bus_dead
) {
1140 if (host
->bus_ops
->remove
)
1141 host
->bus_ops
->remove(host
);
1143 mmc_claim_host(host
);
1144 mmc_detach_bus(host
);
1145 mmc_release_host(host
);
1153 mmc_power_off(host
);
1156 void mmc_power_save_host(struct mmc_host
*host
)
1160 if (!host
->bus_ops
|| host
->bus_dead
|| !host
->bus_ops
->power_restore
) {
1165 if (host
->bus_ops
->power_save
)
1166 host
->bus_ops
->power_save(host
);
1170 mmc_power_off(host
);
1172 EXPORT_SYMBOL(mmc_power_save_host
);
1174 void mmc_power_restore_host(struct mmc_host
*host
)
1178 if (!host
->bus_ops
|| host
->bus_dead
|| !host
->bus_ops
->power_restore
) {
1184 host
->bus_ops
->power_restore(host
);
1188 EXPORT_SYMBOL(mmc_power_restore_host
);
1190 int mmc_card_awake(struct mmc_host
*host
)
1196 if (host
->bus_ops
&& !host
->bus_dead
&& host
->bus_ops
->awake
)
1197 err
= host
->bus_ops
->awake(host
);
1203 EXPORT_SYMBOL(mmc_card_awake
);
1205 int mmc_card_sleep(struct mmc_host
*host
)
1211 if (host
->bus_ops
&& !host
->bus_dead
&& host
->bus_ops
->awake
)
1212 err
= host
->bus_ops
->sleep(host
);
1218 EXPORT_SYMBOL(mmc_card_sleep
);
1220 int mmc_card_can_sleep(struct mmc_host
*host
)
1222 struct mmc_card
*card
= host
->card
;
1224 if (card
&& mmc_card_mmc(card
) && card
->ext_csd
.rev
>= 3)
1228 EXPORT_SYMBOL(mmc_card_can_sleep
);
1233 * mmc_suspend_host - suspend a host
1235 * @state: suspend mode (PM_SUSPEND_xxx)
1237 int mmc_suspend_host(struct mmc_host
*host
, pm_message_t state
)
1241 if (host
->caps
& MMC_CAP_DISABLE
)
1242 cancel_delayed_work(&host
->disable
);
1243 cancel_delayed_work(&host
->detect
);
1244 mmc_flush_scheduled_work();
1247 if (host
->bus_ops
&& !host
->bus_dead
) {
1248 if (host
->bus_ops
->suspend
)
1249 err
= host
->bus_ops
->suspend(host
);
1250 if (err
== -ENOSYS
|| !host
->bus_ops
->resume
) {
1252 * We simply "remove" the card in this case.
1253 * It will be redetected on resume.
1255 if (host
->bus_ops
->remove
)
1256 host
->bus_ops
->remove(host
);
1257 mmc_claim_host(host
);
1258 mmc_detach_bus(host
);
1259 mmc_release_host(host
);
1266 mmc_power_off(host
);
1271 EXPORT_SYMBOL(mmc_suspend_host
);
1274 * mmc_resume_host - resume a previously suspended host
1277 int mmc_resume_host(struct mmc_host
*host
)
1282 if (host
->bus_ops
&& !host
->bus_dead
) {
1284 mmc_select_voltage(host
, host
->ocr
);
1285 BUG_ON(!host
->bus_ops
->resume
);
1286 err
= host
->bus_ops
->resume(host
);
1288 printk(KERN_WARNING
"%s: error %d during resume "
1289 "(card was removed?)\n",
1290 mmc_hostname(host
), err
);
1291 if (host
->bus_ops
->remove
)
1292 host
->bus_ops
->remove(host
);
1293 mmc_claim_host(host
);
1294 mmc_detach_bus(host
);
1295 mmc_release_host(host
);
1296 /* no need to bother upper layers */
1303 * We add a slight delay here so that resume can progress
1306 mmc_detect_change(host
, 1);
1311 EXPORT_SYMBOL(mmc_resume_host
);
1315 static int __init
mmc_init(void)
1319 workqueue
= create_singlethread_workqueue("kmmcd");
1323 ret
= mmc_register_bus();
1325 goto destroy_workqueue
;
1327 ret
= mmc_register_host_class();
1329 goto unregister_bus
;
1331 ret
= sdio_register_bus();
1333 goto unregister_host_class
;
1337 unregister_host_class
:
1338 mmc_unregister_host_class();
1340 mmc_unregister_bus();
1342 destroy_workqueue(workqueue
);
1347 static void __exit
mmc_exit(void)
1349 sdio_unregister_bus();
1350 mmc_unregister_host_class();
1351 mmc_unregister_bus();
1352 destroy_workqueue(workqueue
);
1355 subsys_initcall(mmc_init
);
1356 module_exit(mmc_exit
);
1358 MODULE_LICENSE("GPL");