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 * We normally treat cards as removed during suspend if they are not
52 * known to be on a non-removable bus, to avoid the risk of writing
53 * back data to a different card after resume. Allow this to be
54 * overridden if necessary.
56 #ifdef CONFIG_MMC_UNSAFE_RESUME
57 int mmc_assume_removable;
59 int mmc_assume_removable = 1;
61 module_param_named(removable, mmc_assume_removable, bool, 0644);
64 "MMC/SD cards are removable and may be removed during suspend");
67 * Internal function. Schedule delayed work in the MMC work queue.
69 static int mmc_schedule_delayed_work(struct delayed_work *work,
72 return queue_delayed_work(workqueue, work, delay);
76 * Internal function. Flush all scheduled work from the MMC work queue.
78 static void mmc_flush_scheduled_work(void)
80 flush_workqueue(workqueue);
84 * mmc_request_done - finish processing an MMC request
85 * @host: MMC host which completed request
86 * @mrq: MMC request which request
88 * MMC drivers should call this function when they have completed
89 * their processing of a request.
91 void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq)
93 struct mmc_command *cmd = mrq->cmd;
96 if (err && cmd->retries && mmc_host_is_spi(host)) {
97 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
101 if (err && cmd->retries) {
102 pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
103 mmc_hostname(host), cmd->opcode, err);
107 host->ops->request(host, mrq);
109 led_trigger_event(host->led, LED_OFF);
111 pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n",
112 mmc_hostname(host), cmd->opcode, err,
113 cmd->resp[0], cmd->resp[1],
114 cmd->resp[2], cmd->resp[3]);
117 pr_debug("%s: %d bytes transferred: %d\n",
119 mrq->data->bytes_xfered, mrq->data->error);
123 pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n",
124 mmc_hostname(host), mrq->stop->opcode,
126 mrq->stop->resp[0], mrq->stop->resp[1],
127 mrq->stop->resp[2], mrq->stop->resp[3]);
135 EXPORT_SYMBOL(mmc_request_done);
138 mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
140 #ifdef CONFIG_MMC_DEBUG
142 struct scatterlist *sg;
145 pr_debug("%s: starting CMD%u arg %08x flags %08x\n",
146 mmc_hostname(host), mrq->cmd->opcode,
147 mrq->cmd->arg, mrq->cmd->flags);
150 pr_debug("%s: blksz %d blocks %d flags %08x "
151 "tsac %d ms nsac %d\n",
152 mmc_hostname(host), mrq->data->blksz,
153 mrq->data->blocks, mrq->data->flags,
154 mrq->data->timeout_ns / 1000000,
155 mrq->data->timeout_clks);
159 pr_debug("%s: CMD%u arg %08x flags %08x\n",
160 mmc_hostname(host), mrq->stop->opcode,
161 mrq->stop->arg, mrq->stop->flags);
164 WARN_ON(!host->claimed);
166 led_trigger_event(host->led, LED_FULL);
171 BUG_ON(mrq->data->blksz > host->max_blk_size);
172 BUG_ON(mrq->data->blocks > host->max_blk_count);
173 BUG_ON(mrq->data->blocks * mrq->data->blksz >
176 #ifdef CONFIG_MMC_DEBUG
178 for_each_sg(mrq->data->sg, sg, mrq->data->sg_len, i)
180 BUG_ON(sz != mrq->data->blocks * mrq->data->blksz);
183 mrq->cmd->data = mrq->data;
184 mrq->data->error = 0;
185 mrq->data->mrq = mrq;
187 mrq->data->stop = mrq->stop;
188 mrq->stop->error = 0;
189 mrq->stop->mrq = mrq;
192 host->ops->request(host, mrq);
195 static void mmc_wait_done(struct mmc_request *mrq)
197 complete(mrq->done_data);
201 * mmc_wait_for_req - start a request and wait for completion
202 * @host: MMC host to start command
203 * @mrq: MMC request to start
205 * Start a new MMC custom command request for a host, and wait
206 * for the command to complete. Does not attempt to parse the
209 void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
211 DECLARE_COMPLETION_ONSTACK(complete);
213 mrq->done_data = &complete;
214 mrq->done = mmc_wait_done;
216 mmc_start_request(host, mrq);
218 wait_for_completion(&complete);
221 EXPORT_SYMBOL(mmc_wait_for_req);
224 * mmc_wait_for_cmd - start a command and wait for completion
225 * @host: MMC host to start command
226 * @cmd: MMC command to start
227 * @retries: maximum number of retries
229 * Start a new MMC command for a host, and wait for the command
230 * to complete. Return any error that occurred while the command
231 * was executing. Do not attempt to parse the response.
233 int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries)
235 struct mmc_request mrq;
237 WARN_ON(!host->claimed);
239 memset(&mrq, 0, sizeof(struct mmc_request));
241 memset(cmd->resp, 0, sizeof(cmd->resp));
242 cmd->retries = retries;
247 mmc_wait_for_req(host, &mrq);
252 EXPORT_SYMBOL(mmc_wait_for_cmd);
255 * mmc_set_data_timeout - set the timeout for a data command
256 * @data: data phase for command
257 * @card: the MMC card associated with the data transfer
259 * Computes the data timeout parameters according to the
260 * correct algorithm given the card type.
262 void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
267 * SDIO cards only define an upper 1 s limit on access.
269 if (mmc_card_sdio(card)) {
270 data->timeout_ns = 1000000000;
271 data->timeout_clks = 0;
276 * SD cards use a 100 multiplier rather than 10
278 mult = mmc_card_sd(card) ? 100 : 10;
281 * Scale up the multiplier (and therefore the timeout) by
282 * the r2w factor for writes.
284 if (data->flags & MMC_DATA_WRITE)
285 mult <<= card->csd.r2w_factor;
287 data->timeout_ns = card->csd.tacc_ns * mult;
288 data->timeout_clks = card->csd.tacc_clks * mult;
291 * SD cards also have an upper limit on the timeout.
293 if (mmc_card_sd(card)) {
294 unsigned int timeout_us, limit_us;
296 timeout_us = data->timeout_ns / 1000;
297 timeout_us += data->timeout_clks * 1000 /
298 (card->host->ios.clock / 1000);
300 if (data->flags & MMC_DATA_WRITE)
302 * The limit is really 250 ms, but that is
303 * insufficient for some crappy cards.
310 * SDHC cards always use these fixed values.
312 if (timeout_us > limit_us || mmc_card_blockaddr(card)) {
313 data->timeout_ns = limit_us * 1000;
314 data->timeout_clks = 0;
318 * Some cards need very high timeouts if driven in SPI mode.
319 * The worst observed timeout was 900ms after writing a
320 * continuous stream of data until the internal logic
323 if (mmc_host_is_spi(card->host)) {
324 if (data->flags & MMC_DATA_WRITE) {
325 if (data->timeout_ns < 1000000000)
326 data->timeout_ns = 1000000000; /* 1s */
328 if (data->timeout_ns < 100000000)
329 data->timeout_ns = 100000000; /* 100ms */
333 EXPORT_SYMBOL(mmc_set_data_timeout);
336 * mmc_align_data_size - pads a transfer size to a more optimal value
337 * @card: the MMC card associated with the data transfer
338 * @sz: original transfer size
340 * Pads the original data size with a number of extra bytes in
341 * order to avoid controller bugs and/or performance hits
342 * (e.g. some controllers revert to PIO for certain sizes).
344 * Returns the improved size, which might be unmodified.
346 * Note that this function is only relevant when issuing a
347 * single scatter gather entry.
349 unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz)
352 * FIXME: We don't have a system for the controller to tell
353 * the core about its problems yet, so for now we just 32-bit
356 sz = ((sz + 3) / 4) * 4;
360 EXPORT_SYMBOL(mmc_align_data_size);
363 * mmc_host_enable - enable a host.
364 * @host: mmc host to enable
366 * Hosts that support power saving can use the 'enable' and 'disable'
367 * methods to exit and enter power saving states. For more information
368 * see comments for struct mmc_host_ops.
370 int mmc_host_enable(struct mmc_host *host)
372 if (!(host->caps & MMC_CAP_DISABLE))
375 if (host->en_dis_recurs)
378 if (host->nesting_cnt++)
381 cancel_delayed_work_sync(&host->disable);
386 if (host->ops->enable) {
389 host->en_dis_recurs = 1;
390 err = host->ops->enable(host);
391 host->en_dis_recurs = 0;
394 pr_debug("%s: enable error %d\n",
395 mmc_hostname(host), err);
402 EXPORT_SYMBOL(mmc_host_enable);
404 static int mmc_host_do_disable(struct mmc_host *host, int lazy)
406 if (host->ops->disable) {
409 host->en_dis_recurs = 1;
410 err = host->ops->disable(host, lazy);
411 host->en_dis_recurs = 0;
414 pr_debug("%s: disable error %d\n",
415 mmc_hostname(host), err);
419 unsigned long delay = msecs_to_jiffies(err);
421 mmc_schedule_delayed_work(&host->disable, delay);
429 * mmc_host_disable - disable a host.
430 * @host: mmc host to disable
432 * Hosts that support power saving can use the 'enable' and 'disable'
433 * methods to exit and enter power saving states. For more information
434 * see comments for struct mmc_host_ops.
436 int mmc_host_disable(struct mmc_host *host)
440 if (!(host->caps & MMC_CAP_DISABLE))
443 if (host->en_dis_recurs)
446 if (--host->nesting_cnt)
452 err = mmc_host_do_disable(host, 0);
455 EXPORT_SYMBOL(mmc_host_disable);
458 * __mmc_claim_host - exclusively claim a host
459 * @host: mmc host to claim
460 * @abort: whether or not the operation should be aborted
462 * Claim a host for a set of operations. If @abort is non null and
463 * dereference a non-zero value then this will return prematurely with
464 * that non-zero value without acquiring the lock. Returns zero
465 * with the lock held otherwise.
467 int __mmc_claim_host(struct mmc_host *host, atomic_t *abort)
469 DECLARE_WAITQUEUE(wait, current);
475 add_wait_queue(&host->wq, &wait);
476 spin_lock_irqsave(&host->lock, flags);
478 set_current_state(TASK_UNINTERRUPTIBLE);
479 stop = abort ? atomic_read(abort) : 0;
480 if (stop || !host->claimed || host->claimer == current)
482 spin_unlock_irqrestore(&host->lock, flags);
484 spin_lock_irqsave(&host->lock, flags);
486 set_current_state(TASK_RUNNING);
489 host->claimer = current;
490 host->claim_cnt += 1;
493 spin_unlock_irqrestore(&host->lock, flags);
494 remove_wait_queue(&host->wq, &wait);
496 mmc_host_enable(host);
500 EXPORT_SYMBOL(__mmc_claim_host);
503 * mmc_try_claim_host - try exclusively to claim a host
504 * @host: mmc host to claim
506 * Returns %1 if the host is claimed, %0 otherwise.
508 int mmc_try_claim_host(struct mmc_host *host)
510 int claimed_host = 0;
513 spin_lock_irqsave(&host->lock, flags);
514 if (!host->claimed || host->claimer == current) {
516 host->claimer = current;
517 host->claim_cnt += 1;
520 spin_unlock_irqrestore(&host->lock, flags);
523 EXPORT_SYMBOL(mmc_try_claim_host);
525 static void mmc_do_release_host(struct mmc_host *host)
529 spin_lock_irqsave(&host->lock, flags);
530 if (--host->claim_cnt) {
531 /* Release for nested claim */
532 spin_unlock_irqrestore(&host->lock, flags);
535 host->claimer = NULL;
536 spin_unlock_irqrestore(&host->lock, flags);
541 void mmc_host_deeper_disable(struct work_struct *work)
543 struct mmc_host *host =
544 container_of(work, struct mmc_host, disable.work);
546 /* If the host is claimed then we do not want to disable it anymore */
547 if (!mmc_try_claim_host(host))
549 mmc_host_do_disable(host, 1);
550 mmc_do_release_host(host);
554 * mmc_host_lazy_disable - lazily disable a host.
555 * @host: mmc host to disable
557 * Hosts that support power saving can use the 'enable' and 'disable'
558 * methods to exit and enter power saving states. For more information
559 * see comments for struct mmc_host_ops.
561 int mmc_host_lazy_disable(struct mmc_host *host)
563 if (!(host->caps & MMC_CAP_DISABLE))
566 if (host->en_dis_recurs)
569 if (--host->nesting_cnt)
575 if (host->disable_delay) {
576 mmc_schedule_delayed_work(&host->disable,
577 msecs_to_jiffies(host->disable_delay));
580 return mmc_host_do_disable(host, 1);
582 EXPORT_SYMBOL(mmc_host_lazy_disable);
585 * mmc_release_host - release a host
586 * @host: mmc host to release
588 * Release a MMC host, allowing others to claim the host
589 * for their operations.
591 void mmc_release_host(struct mmc_host *host)
593 WARN_ON(!host->claimed);
595 mmc_host_lazy_disable(host);
597 mmc_do_release_host(host);
600 EXPORT_SYMBOL(mmc_release_host);
603 * Internal function that does the actual ios call to the host driver,
604 * optionally printing some debug output.
606 static inline void mmc_set_ios(struct mmc_host *host)
608 struct mmc_ios *ios = &host->ios;
610 pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u "
611 "width %u timing %u\n",
612 mmc_hostname(host), ios->clock, ios->bus_mode,
613 ios->power_mode, ios->chip_select, ios->vdd,
614 ios->bus_width, ios->timing);
616 host->ops->set_ios(host, ios);
620 * Control chip select pin on a host.
622 void mmc_set_chip_select(struct mmc_host *host, int mode)
624 host->ios.chip_select = mode;
629 * Sets the host clock to the highest possible frequency that
632 void mmc_set_clock(struct mmc_host *host, unsigned int hz)
634 WARN_ON(hz < host->f_min);
636 if (hz > host->f_max)
639 host->ios.clock = hz;
644 * Change the bus mode (open drain/push-pull) of a host.
646 void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode)
648 host->ios.bus_mode = mode;
653 * Change data bus width of a host.
655 void mmc_set_bus_width(struct mmc_host *host, unsigned int width)
657 host->ios.bus_width = width;
662 * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number
664 * @low_bits: prefer low bits in boundary cases
666 * This function returns the OCR bit number according to the provided @vdd
667 * value. If conversion is not possible a negative errno value returned.
669 * Depending on the @low_bits flag the function prefers low or high OCR bits
670 * on boundary voltages. For example,
671 * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33);
672 * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34);
674 * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21).
676 static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits)
678 const int max_bit = ilog2(MMC_VDD_35_36);
681 if (vdd < 1650 || vdd > 3600)
684 if (vdd >= 1650 && vdd <= 1950)
685 return ilog2(MMC_VDD_165_195);
690 /* Base 2000 mV, step 100 mV, bit's base 8. */
691 bit = (vdd - 2000) / 100 + 8;
698 * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask
699 * @vdd_min: minimum voltage value (mV)
700 * @vdd_max: maximum voltage value (mV)
702 * This function returns the OCR mask bits according to the provided @vdd_min
703 * and @vdd_max values. If conversion is not possible the function returns 0.
705 * Notes wrt boundary cases:
706 * This function sets the OCR bits for all boundary voltages, for example
707 * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 |
708 * MMC_VDD_34_35 mask.
710 u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max)
714 if (vdd_max < vdd_min)
717 /* Prefer high bits for the boundary vdd_max values. */
718 vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false);
722 /* Prefer low bits for the boundary vdd_min values. */
723 vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true);
727 /* Fill the mask, from max bit to min bit. */
728 while (vdd_max >= vdd_min)
729 mask |= 1 << vdd_max--;
733 EXPORT_SYMBOL(mmc_vddrange_to_ocrmask);
735 #ifdef CONFIG_REGULATOR
738 * mmc_regulator_get_ocrmask - return mask of supported voltages
739 * @supply: regulator to use
741 * This returns either a negative errno, or a mask of voltages that
742 * can be provided to MMC/SD/SDIO devices using the specified voltage
743 * regulator. This would normally be called before registering the
746 int mmc_regulator_get_ocrmask(struct regulator *supply)
752 count = regulator_count_voltages(supply);
756 for (i = 0; i < count; i++) {
760 vdd_uV = regulator_list_voltage(supply, i);
764 vdd_mV = vdd_uV / 1000;
765 result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV);
770 EXPORT_SYMBOL(mmc_regulator_get_ocrmask);
773 * mmc_regulator_set_ocr - set regulator to match host->ios voltage
774 * @vdd_bit: zero for power off, else a bit number (host->ios.vdd)
775 * @supply: regulator to use
777 * Returns zero on success, else negative errno.
779 * MMC host drivers may use this to enable or disable a regulator using
780 * a particular supply voltage. This would normally be called from the
783 int mmc_regulator_set_ocr(struct regulator *supply, unsigned short vdd_bit)
789 enabled = regulator_is_enabled(supply);
797 /* REVISIT mmc_vddrange_to_ocrmask() may have set some
798 * bits this regulator doesn't quite support ... don't
799 * be too picky, most cards and regulators are OK with
800 * a 0.1V range goof (it's a small error percentage).
802 tmp = vdd_bit - ilog2(MMC_VDD_165_195);
804 min_uV = 1650 * 1000;
805 max_uV = 1950 * 1000;
807 min_uV = 1900 * 1000 + tmp * 100 * 1000;
808 max_uV = min_uV + 100 * 1000;
811 /* avoid needless changes to this voltage; the regulator
812 * might not allow this operation
814 voltage = regulator_get_voltage(supply);
817 else if (voltage < min_uV || voltage > max_uV)
818 result = regulator_set_voltage(supply, min_uV, max_uV);
822 if (result == 0 && !enabled)
823 result = regulator_enable(supply);
824 } else if (enabled) {
825 result = regulator_disable(supply);
830 EXPORT_SYMBOL(mmc_regulator_set_ocr);
835 * Mask off any voltages we don't support and select
838 u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
842 ocr &= host->ocr_avail;
853 pr_warning("%s: host doesn't support card's voltages\n",
862 * Select timing parameters for host.
864 void mmc_set_timing(struct mmc_host *host, unsigned int timing)
866 host->ios.timing = timing;
871 * Apply power to the MMC stack. This is a two-stage process.
872 * First, we enable power to the card without the clock running.
873 * We then wait a bit for the power to stabilise. Finally,
874 * enable the bus drivers and clock to the card.
876 * We must _NOT_ enable the clock prior to power stablising.
878 * If a host does all the power sequencing itself, ignore the
879 * initial MMC_POWER_UP stage.
881 static void mmc_power_up(struct mmc_host *host)
885 /* If ocr is set, we use it */
887 bit = ffs(host->ocr) - 1;
889 bit = fls(host->ocr_avail) - 1;
892 if (mmc_host_is_spi(host)) {
893 host->ios.chip_select = MMC_CS_HIGH;
894 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
896 host->ios.chip_select = MMC_CS_DONTCARE;
897 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
899 host->ios.power_mode = MMC_POWER_UP;
900 host->ios.bus_width = MMC_BUS_WIDTH_1;
901 host->ios.timing = MMC_TIMING_LEGACY;
905 * This delay should be sufficient to allow the power supply
906 * to reach the minimum voltage.
910 if (host->f_min > 400000) {
911 pr_warning("%s: Minimum clock frequency too high for "
912 "identification mode\n", mmc_hostname(host));
913 host->ios.clock = host->f_min;
915 host->ios.clock = 400000;
917 host->ios.power_mode = MMC_POWER_ON;
921 * This delay must be at least 74 clock sizes, or 1 ms, or the
922 * time required to reach a stable voltage.
927 static void mmc_power_off(struct mmc_host *host)
931 if (!mmc_host_is_spi(host)) {
932 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
933 host->ios.chip_select = MMC_CS_DONTCARE;
935 host->ios.power_mode = MMC_POWER_OFF;
936 host->ios.bus_width = MMC_BUS_WIDTH_1;
937 host->ios.timing = MMC_TIMING_LEGACY;
942 * Cleanup when the last reference to the bus operator is dropped.
944 static void __mmc_release_bus(struct mmc_host *host)
947 BUG_ON(host->bus_refs);
948 BUG_ON(!host->bus_dead);
950 host->bus_ops = NULL;
954 * Increase reference count of bus operator
956 static inline void mmc_bus_get(struct mmc_host *host)
960 spin_lock_irqsave(&host->lock, flags);
962 spin_unlock_irqrestore(&host->lock, flags);
966 * Decrease reference count of bus operator and free it if
967 * it is the last reference.
969 static inline void mmc_bus_put(struct mmc_host *host)
973 spin_lock_irqsave(&host->lock, flags);
975 if ((host->bus_refs == 0) && host->bus_ops)
976 __mmc_release_bus(host);
977 spin_unlock_irqrestore(&host->lock, flags);
981 * Assign a mmc bus handler to a host. Only one bus handler may control a
982 * host at any given time.
984 void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops)
991 WARN_ON(!host->claimed);
993 spin_lock_irqsave(&host->lock, flags);
995 BUG_ON(host->bus_ops);
996 BUG_ON(host->bus_refs);
1002 spin_unlock_irqrestore(&host->lock, flags);
1006 * Remove the current bus handler from a host. Assumes that there are
1007 * no interesting cards left, so the bus is powered down.
1009 void mmc_detach_bus(struct mmc_host *host)
1011 unsigned long flags;
1015 WARN_ON(!host->claimed);
1016 WARN_ON(!host->bus_ops);
1018 spin_lock_irqsave(&host->lock, flags);
1022 spin_unlock_irqrestore(&host->lock, flags);
1024 mmc_power_off(host);
1030 * mmc_detect_change - process change of state on a MMC socket
1031 * @host: host which changed state.
1032 * @delay: optional delay to wait before detection (jiffies)
1034 * MMC drivers should call this when they detect a card has been
1035 * inserted or removed. The MMC layer will confirm that any
1036 * present card is still functional, and initialize any newly
1039 void mmc_detect_change(struct mmc_host *host, unsigned long delay)
1041 #ifdef CONFIG_MMC_DEBUG
1042 unsigned long flags;
1043 spin_lock_irqsave(&host->lock, flags);
1044 WARN_ON(host->removed);
1045 spin_unlock_irqrestore(&host->lock, flags);
1048 mmc_schedule_delayed_work(&host->detect, delay);
1051 EXPORT_SYMBOL(mmc_detect_change);
1054 void mmc_rescan(struct work_struct *work)
1056 struct mmc_host *host =
1057 container_of(work, struct mmc_host, detect.work);
1063 /* if there is a card registered, check whether it is still present */
1064 if ((host->bus_ops != NULL) && host->bus_ops->detect && !host->bus_dead)
1065 host->bus_ops->detect(host);
1072 /* if there still is a card present, stop here */
1073 if (host->bus_ops != NULL) {
1078 /* detect a newly inserted card */
1081 * Only we can add a new handler, so it's safe to
1082 * release the lock here.
1086 if (host->ops->get_cd && host->ops->get_cd(host) == 0)
1089 mmc_claim_host(host);
1094 mmc_send_if_cond(host, host->ocr_avail);
1097 * First we search for SDIO...
1099 err = mmc_send_io_op_cond(host, 0, &ocr);
1101 if (mmc_attach_sdio(host, ocr))
1102 mmc_power_off(host);
1107 * ...then normal SD...
1109 err = mmc_send_app_op_cond(host, 0, &ocr);
1111 if (mmc_attach_sd(host, ocr))
1112 mmc_power_off(host);
1117 * ...and finally MMC.
1119 err = mmc_send_op_cond(host, 0, &ocr);
1121 if (mmc_attach_mmc(host, ocr))
1122 mmc_power_off(host);
1126 mmc_release_host(host);
1127 mmc_power_off(host);
1130 if (host->caps & MMC_CAP_NEEDS_POLL)
1131 mmc_schedule_delayed_work(&host->detect, HZ);
1134 void mmc_start_host(struct mmc_host *host)
1136 mmc_power_off(host);
1137 mmc_detect_change(host, 0);
1140 void mmc_stop_host(struct mmc_host *host)
1142 #ifdef CONFIG_MMC_DEBUG
1143 unsigned long flags;
1144 spin_lock_irqsave(&host->lock, flags);
1146 spin_unlock_irqrestore(&host->lock, flags);
1149 if (host->caps & MMC_CAP_DISABLE)
1150 cancel_delayed_work(&host->disable);
1151 cancel_delayed_work(&host->detect);
1152 mmc_flush_scheduled_work();
1155 if (host->bus_ops && !host->bus_dead) {
1156 if (host->bus_ops->remove)
1157 host->bus_ops->remove(host);
1159 mmc_claim_host(host);
1160 mmc_detach_bus(host);
1161 mmc_release_host(host);
1169 mmc_power_off(host);
1172 void mmc_power_save_host(struct mmc_host *host)
1176 if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) {
1181 if (host->bus_ops->power_save)
1182 host->bus_ops->power_save(host);
1186 mmc_power_off(host);
1188 EXPORT_SYMBOL(mmc_power_save_host);
1190 void mmc_power_restore_host(struct mmc_host *host)
1194 if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) {
1200 host->bus_ops->power_restore(host);
1204 EXPORT_SYMBOL(mmc_power_restore_host);
1206 int mmc_card_awake(struct mmc_host *host)
1212 if (host->bus_ops && !host->bus_dead && host->bus_ops->awake)
1213 err = host->bus_ops->awake(host);
1219 EXPORT_SYMBOL(mmc_card_awake);
1221 int mmc_card_sleep(struct mmc_host *host)
1227 if (host->bus_ops && !host->bus_dead && host->bus_ops->awake)
1228 err = host->bus_ops->sleep(host);
1234 EXPORT_SYMBOL(mmc_card_sleep);
1236 int mmc_card_can_sleep(struct mmc_host *host)
1238 struct mmc_card *card = host->card;
1240 if (card && mmc_card_mmc(card) && card->ext_csd.rev >= 3)
1244 EXPORT_SYMBOL(mmc_card_can_sleep);
1249 * mmc_suspend_host - suspend a host
1251 * @state: suspend mode (PM_SUSPEND_xxx)
1253 int mmc_suspend_host(struct mmc_host *host, pm_message_t state)
1257 if (host->caps & MMC_CAP_DISABLE)
1258 cancel_delayed_work(&host->disable);
1259 cancel_delayed_work(&host->detect);
1260 mmc_flush_scheduled_work();
1263 if (host->bus_ops && !host->bus_dead) {
1264 if (host->bus_ops->suspend)
1265 err = host->bus_ops->suspend(host);
1266 if (err == -ENOSYS || !host->bus_ops->resume) {
1268 * We simply "remove" the card in this case.
1269 * It will be redetected on resume.
1271 if (host->bus_ops->remove)
1272 host->bus_ops->remove(host);
1273 mmc_claim_host(host);
1274 mmc_detach_bus(host);
1275 mmc_release_host(host);
1282 mmc_power_off(host);
1287 EXPORT_SYMBOL(mmc_suspend_host);
1290 * mmc_resume_host - resume a previously suspended host
1293 int mmc_resume_host(struct mmc_host *host)
1298 if (host->bus_ops && !host->bus_dead) {
1300 mmc_select_voltage(host, host->ocr);
1301 BUG_ON(!host->bus_ops->resume);
1302 err = host->bus_ops->resume(host);
1304 printk(KERN_WARNING "%s: error %d during resume "
1305 "(card was removed?)\n",
1306 mmc_hostname(host), err);
1307 if (host->bus_ops->remove)
1308 host->bus_ops->remove(host);
1309 mmc_claim_host(host);
1310 mmc_detach_bus(host);
1311 mmc_release_host(host);
1312 /* no need to bother upper layers */
1319 * We add a slight delay here so that resume can progress
1322 mmc_detect_change(host, 1);
1327 EXPORT_SYMBOL(mmc_resume_host);
1331 static int __init mmc_init(void)
1335 workqueue = create_singlethread_workqueue("kmmcd");
1339 ret = mmc_register_bus();
1341 goto destroy_workqueue;
1343 ret = mmc_register_host_class();
1345 goto unregister_bus;
1347 ret = sdio_register_bus();
1349 goto unregister_host_class;
1353 unregister_host_class:
1354 mmc_unregister_host_class();
1356 mmc_unregister_bus();
1358 destroy_workqueue(workqueue);
1363 static void __exit mmc_exit(void)
1365 sdio_unregister_bus();
1366 mmc_unregister_host_class();
1367 mmc_unregister_bus();
1368 destroy_workqueue(workqueue);
1371 subsys_initcall(mmc_init);
1372 module_exit(mmc_exit);
1374 MODULE_LICENSE("GPL");