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");