2 * linux/drivers/mmc/core/core.c
4 * Copyright (C) 2003-2004 Russell King, All Rights Reserved.
5 * SD support Copyright (C) 2004 Ian Molton, All Rights Reserved.
6 * Copyright (C) 2005-2008 Pierre Ossman, All Rights Reserved.
7 * MMCv4 support Copyright (C) 2006 Philip Langdale, All Rights Reserved.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/interrupt.h>
16 #include <linux/completion.h>
17 #include <linux/device.h>
18 #include <linux/delay.h>
19 #include <linux/pagemap.h>
20 #include <linux/err.h>
21 #include <linux/leds.h>
22 #include <linux/scatterlist.h>
23 #include <linux/log2.h>
24 #include <linux/regulator/consumer.h>
25 #include <linux/pm_runtime.h>
26 #include <linux/suspend.h>
27 #include <linux/fault-inject.h>
28 #include <linux/random.h>
30 #include <linux/mmc/card.h>
31 #include <linux/mmc/host.h>
32 #include <linux/mmc/mmc.h>
33 #include <linux/mmc/sd.h>
44 static struct workqueue_struct *workqueue;
47 * Enabling software CRCs on the data blocks can be a significant (30%)
48 * performance cost, and for other reasons may not always be desired.
49 * So we allow it it to be disabled.
52 module_param(use_spi_crc, bool, 0);
55 * We normally treat cards as removed during suspend if they are not
56 * known to be on a non-removable bus, to avoid the risk of writing
57 * back data to a different card after resume. Allow this to be
58 * overridden if necessary.
60 #ifdef CONFIG_MMC_UNSAFE_RESUME
61 bool mmc_assume_removable;
63 bool mmc_assume_removable = 1;
65 EXPORT_SYMBOL(mmc_assume_removable);
66 module_param_named(removable, mmc_assume_removable, bool, 0644);
69 "MMC/SD cards are removable and may be removed during suspend");
72 * Internal function. Schedule delayed work in the MMC work queue.
74 static int mmc_schedule_delayed_work(struct delayed_work *work,
77 return queue_delayed_work(workqueue, work, delay);
81 * Internal function. Flush all scheduled work from the MMC work queue.
83 static void mmc_flush_scheduled_work(void)
85 flush_workqueue(workqueue);
88 #ifdef CONFIG_FAIL_MMC_REQUEST
91 * Internal function. Inject random data errors.
92 * If mmc_data is NULL no errors are injected.
94 static void mmc_should_fail_request(struct mmc_host *host,
95 struct mmc_request *mrq)
97 struct mmc_command *cmd = mrq->cmd;
98 struct mmc_data *data = mrq->data;
99 static const int data_errors[] = {
108 if (cmd->error || data->error ||
109 !should_fail(&host->fail_mmc_request, data->blksz * data->blocks))
112 data->error = data_errors[random32() % ARRAY_SIZE(data_errors)];
113 data->bytes_xfered = (random32() % (data->bytes_xfered >> 9)) << 9;
116 #else /* CONFIG_FAIL_MMC_REQUEST */
118 static inline void mmc_should_fail_request(struct mmc_host *host,
119 struct mmc_request *mrq)
123 #endif /* CONFIG_FAIL_MMC_REQUEST */
126 * mmc_request_done - finish processing an MMC request
127 * @host: MMC host which completed request
128 * @mrq: MMC request which request
130 * MMC drivers should call this function when they have completed
131 * their processing of a request.
133 void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq)
135 struct mmc_command *cmd = mrq->cmd;
136 int err = cmd->error;
138 if (err && cmd->retries && mmc_host_is_spi(host)) {
139 if (cmd->resp[0] & R1_SPI_ILLEGAL_COMMAND)
143 if (err && cmd->retries && !mmc_card_removed(host->card)) {
145 * Request starter must handle retries - see
146 * mmc_wait_for_req_done().
151 mmc_should_fail_request(host, mrq);
153 led_trigger_event(host->led, LED_OFF);
155 pr_debug("%s: req done (CMD%u): %d: %08x %08x %08x %08x\n",
156 mmc_hostname(host), cmd->opcode, err,
157 cmd->resp[0], cmd->resp[1],
158 cmd->resp[2], cmd->resp[3]);
161 pr_debug("%s: %d bytes transferred: %d\n",
163 mrq->data->bytes_xfered, mrq->data->error);
167 pr_debug("%s: (CMD%u): %d: %08x %08x %08x %08x\n",
168 mmc_hostname(host), mrq->stop->opcode,
170 mrq->stop->resp[0], mrq->stop->resp[1],
171 mrq->stop->resp[2], mrq->stop->resp[3]);
177 mmc_host_clk_release(host);
181 EXPORT_SYMBOL(mmc_request_done);
184 mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
186 #ifdef CONFIG_MMC_DEBUG
188 struct scatterlist *sg;
192 pr_debug("<%s: starting CMD%u arg %08x flags %08x>\n",
193 mmc_hostname(host), mrq->sbc->opcode,
194 mrq->sbc->arg, mrq->sbc->flags);
197 pr_debug("%s: starting CMD%u arg %08x flags %08x\n",
198 mmc_hostname(host), mrq->cmd->opcode,
199 mrq->cmd->arg, mrq->cmd->flags);
202 pr_debug("%s: blksz %d blocks %d flags %08x "
203 "tsac %d ms nsac %d\n",
204 mmc_hostname(host), mrq->data->blksz,
205 mrq->data->blocks, mrq->data->flags,
206 mrq->data->timeout_ns / 1000000,
207 mrq->data->timeout_clks);
211 pr_debug("%s: CMD%u arg %08x flags %08x\n",
212 mmc_hostname(host), mrq->stop->opcode,
213 mrq->stop->arg, mrq->stop->flags);
216 WARN_ON(!host->claimed);
221 BUG_ON(mrq->data->blksz > host->max_blk_size);
222 BUG_ON(mrq->data->blocks > host->max_blk_count);
223 BUG_ON(mrq->data->blocks * mrq->data->blksz >
226 #ifdef CONFIG_MMC_DEBUG
228 for_each_sg(mrq->data->sg, sg, mrq->data->sg_len, i)
230 BUG_ON(sz != mrq->data->blocks * mrq->data->blksz);
233 mrq->cmd->data = mrq->data;
234 mrq->data->error = 0;
235 mrq->data->mrq = mrq;
237 mrq->data->stop = mrq->stop;
238 mrq->stop->error = 0;
239 mrq->stop->mrq = mrq;
242 mmc_host_clk_hold(host);
243 led_trigger_event(host->led, LED_FULL);
244 host->ops->request(host, mrq);
247 static void mmc_wait_done(struct mmc_request *mrq)
249 complete(&mrq->completion);
252 static int __mmc_start_req(struct mmc_host *host, struct mmc_request *mrq)
254 init_completion(&mrq->completion);
255 mrq->done = mmc_wait_done;
256 if (mmc_card_removed(host->card)) {
257 mrq->cmd->error = -ENOMEDIUM;
258 complete(&mrq->completion);
261 mmc_start_request(host, mrq);
265 static void mmc_wait_for_req_done(struct mmc_host *host,
266 struct mmc_request *mrq)
268 struct mmc_command *cmd;
271 wait_for_completion(&mrq->completion);
274 if (!cmd->error || !cmd->retries ||
275 mmc_card_removed(host->card))
278 pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
279 mmc_hostname(host), cmd->opcode, cmd->error);
282 host->ops->request(host, mrq);
287 * mmc_pre_req - Prepare for a new request
288 * @host: MMC host to prepare command
289 * @mrq: MMC request to prepare for
290 * @is_first_req: true if there is no previous started request
291 * that may run in parellel to this call, otherwise false
293 * mmc_pre_req() is called in prior to mmc_start_req() to let
294 * host prepare for the new request. Preparation of a request may be
295 * performed while another request is running on the host.
297 static void mmc_pre_req(struct mmc_host *host, struct mmc_request *mrq,
300 if (host->ops->pre_req) {
301 mmc_host_clk_hold(host);
302 host->ops->pre_req(host, mrq, is_first_req);
303 mmc_host_clk_release(host);
308 * mmc_post_req - Post process a completed request
309 * @host: MMC host to post process command
310 * @mrq: MMC request to post process for
311 * @err: Error, if non zero, clean up any resources made in pre_req
313 * Let the host post process a completed request. Post processing of
314 * a request may be performed while another reuqest is running.
316 static void mmc_post_req(struct mmc_host *host, struct mmc_request *mrq,
319 if (host->ops->post_req) {
320 mmc_host_clk_hold(host);
321 host->ops->post_req(host, mrq, err);
322 mmc_host_clk_release(host);
327 * mmc_start_req - start a non-blocking request
328 * @host: MMC host to start command
329 * @areq: async request to start
330 * @error: out parameter returns 0 for success, otherwise non zero
332 * Start a new MMC custom command request for a host.
333 * If there is on ongoing async request wait for completion
334 * of that request and start the new one and return.
335 * Does not wait for the new request to complete.
337 * Returns the completed request, NULL in case of none completed.
338 * Wait for the an ongoing request (previoulsy started) to complete and
339 * return the completed request. If there is no ongoing request, NULL
340 * is returned without waiting. NULL is not an error condition.
342 struct mmc_async_req *mmc_start_req(struct mmc_host *host,
343 struct mmc_async_req *areq, int *error)
347 struct mmc_async_req *data = host->areq;
349 /* Prepare a new request */
351 mmc_pre_req(host, areq->mrq, !host->areq);
354 mmc_wait_for_req_done(host, host->areq->mrq);
355 err = host->areq->err_check(host->card, host->areq);
359 start_err = __mmc_start_req(host, areq->mrq);
362 mmc_post_req(host, host->areq->mrq, 0);
364 /* Cancel a prepared request if it was not started. */
365 if ((err || start_err) && areq)
366 mmc_post_req(host, areq->mrq, -EINVAL);
377 EXPORT_SYMBOL(mmc_start_req);
380 * mmc_wait_for_req - start a request and wait for completion
381 * @host: MMC host to start command
382 * @mrq: MMC request to start
384 * Start a new MMC custom command request for a host, and wait
385 * for the command to complete. Does not attempt to parse the
388 void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
390 __mmc_start_req(host, mrq);
391 mmc_wait_for_req_done(host, mrq);
393 EXPORT_SYMBOL(mmc_wait_for_req);
396 * mmc_interrupt_hpi - Issue for High priority Interrupt
397 * @card: the MMC card associated with the HPI transfer
399 * Issued High Priority Interrupt, and check for card status
400 * util out-of prg-state.
402 int mmc_interrupt_hpi(struct mmc_card *card)
409 if (!card->ext_csd.hpi_en) {
410 pr_info("%s: HPI enable bit unset\n", mmc_hostname(card->host));
414 mmc_claim_host(card->host);
415 err = mmc_send_status(card, &status);
417 pr_err("%s: Get card status fail\n", mmc_hostname(card->host));
422 * If the card status is in PRG-state, we can send the HPI command.
424 if (R1_CURRENT_STATE(status) == R1_STATE_PRG) {
427 * We don't know when the HPI command will finish
428 * processing, so we need to resend HPI until out
429 * of prg-state, and keep checking the card status
430 * with SEND_STATUS. If a timeout error occurs when
431 * sending the HPI command, we are already out of
434 err = mmc_send_hpi_cmd(card, &status);
436 pr_debug("%s: abort HPI (%d error)\n",
437 mmc_hostname(card->host), err);
439 err = mmc_send_status(card, &status);
442 } while (R1_CURRENT_STATE(status) == R1_STATE_PRG);
444 pr_debug("%s: Left prg-state\n", mmc_hostname(card->host));
447 mmc_release_host(card->host);
450 EXPORT_SYMBOL(mmc_interrupt_hpi);
453 * mmc_wait_for_cmd - start a command and wait for completion
454 * @host: MMC host to start command
455 * @cmd: MMC command to start
456 * @retries: maximum number of retries
458 * Start a new MMC command for a host, and wait for the command
459 * to complete. Return any error that occurred while the command
460 * was executing. Do not attempt to parse the response.
462 int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries)
464 struct mmc_request mrq = {NULL};
466 WARN_ON(!host->claimed);
468 memset(cmd->resp, 0, sizeof(cmd->resp));
469 cmd->retries = retries;
474 mmc_wait_for_req(host, &mrq);
479 EXPORT_SYMBOL(mmc_wait_for_cmd);
482 * mmc_set_data_timeout - set the timeout for a data command
483 * @data: data phase for command
484 * @card: the MMC card associated with the data transfer
486 * Computes the data timeout parameters according to the
487 * correct algorithm given the card type.
489 void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
494 * SDIO cards only define an upper 1 s limit on access.
496 if (mmc_card_sdio(card)) {
497 data->timeout_ns = 1000000000;
498 data->timeout_clks = 0;
503 * SD cards use a 100 multiplier rather than 10
505 mult = mmc_card_sd(card) ? 100 : 10;
508 * Scale up the multiplier (and therefore the timeout) by
509 * the r2w factor for writes.
511 if (data->flags & MMC_DATA_WRITE)
512 mult <<= card->csd.r2w_factor;
514 data->timeout_ns = card->csd.tacc_ns * mult;
515 data->timeout_clks = card->csd.tacc_clks * mult;
518 * SD cards also have an upper limit on the timeout.
520 if (mmc_card_sd(card)) {
521 unsigned int timeout_us, limit_us;
523 timeout_us = data->timeout_ns / 1000;
524 if (mmc_host_clk_rate(card->host))
525 timeout_us += data->timeout_clks * 1000 /
526 (mmc_host_clk_rate(card->host) / 1000);
528 if (data->flags & MMC_DATA_WRITE)
530 * The limit is really 250 ms, but that is
531 * insufficient for some crappy cards.
538 * SDHC cards always use these fixed values.
540 if (timeout_us > limit_us || mmc_card_blockaddr(card)) {
541 data->timeout_ns = limit_us * 1000;
542 data->timeout_clks = 0;
547 * Some cards require longer data read timeout than indicated in CSD.
548 * Address this by setting the read timeout to a "reasonably high"
549 * value. For the cards tested, 300ms has proven enough. If necessary,
550 * this value can be increased if other problematic cards require this.
552 if (mmc_card_long_read_time(card) && data->flags & MMC_DATA_READ) {
553 data->timeout_ns = 300000000;
554 data->timeout_clks = 0;
558 * Some cards need very high timeouts if driven in SPI mode.
559 * The worst observed timeout was 900ms after writing a
560 * continuous stream of data until the internal logic
563 if (mmc_host_is_spi(card->host)) {
564 if (data->flags & MMC_DATA_WRITE) {
565 if (data->timeout_ns < 1000000000)
566 data->timeout_ns = 1000000000; /* 1s */
568 if (data->timeout_ns < 100000000)
569 data->timeout_ns = 100000000; /* 100ms */
573 EXPORT_SYMBOL(mmc_set_data_timeout);
576 * mmc_align_data_size - pads a transfer size to a more optimal value
577 * @card: the MMC card associated with the data transfer
578 * @sz: original transfer size
580 * Pads the original data size with a number of extra bytes in
581 * order to avoid controller bugs and/or performance hits
582 * (e.g. some controllers revert to PIO for certain sizes).
584 * Returns the improved size, which might be unmodified.
586 * Note that this function is only relevant when issuing a
587 * single scatter gather entry.
589 unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz)
592 * FIXME: We don't have a system for the controller to tell
593 * the core about its problems yet, so for now we just 32-bit
596 sz = ((sz + 3) / 4) * 4;
600 EXPORT_SYMBOL(mmc_align_data_size);
603 * __mmc_claim_host - exclusively claim a host
604 * @host: mmc host to claim
605 * @abort: whether or not the operation should be aborted
607 * Claim a host for a set of operations. If @abort is non null and
608 * dereference a non-zero value then this will return prematurely with
609 * that non-zero value without acquiring the lock. Returns zero
610 * with the lock held otherwise.
612 int __mmc_claim_host(struct mmc_host *host, atomic_t *abort)
614 DECLARE_WAITQUEUE(wait, current);
620 add_wait_queue(&host->wq, &wait);
621 spin_lock_irqsave(&host->lock, flags);
623 set_current_state(TASK_UNINTERRUPTIBLE);
624 stop = abort ? atomic_read(abort) : 0;
625 if (stop || !host->claimed || host->claimer == current)
627 spin_unlock_irqrestore(&host->lock, flags);
629 spin_lock_irqsave(&host->lock, flags);
631 set_current_state(TASK_RUNNING);
634 host->claimer = current;
635 host->claim_cnt += 1;
638 spin_unlock_irqrestore(&host->lock, flags);
639 remove_wait_queue(&host->wq, &wait);
640 if (host->ops->enable && !stop && host->claim_cnt == 1)
641 host->ops->enable(host);
645 EXPORT_SYMBOL(__mmc_claim_host);
648 * mmc_try_claim_host - try exclusively to claim a host
649 * @host: mmc host to claim
651 * Returns %1 if the host is claimed, %0 otherwise.
653 int mmc_try_claim_host(struct mmc_host *host)
655 int claimed_host = 0;
658 spin_lock_irqsave(&host->lock, flags);
659 if (!host->claimed || host->claimer == current) {
661 host->claimer = current;
662 host->claim_cnt += 1;
665 spin_unlock_irqrestore(&host->lock, flags);
666 if (host->ops->enable && claimed_host && host->claim_cnt == 1)
667 host->ops->enable(host);
670 EXPORT_SYMBOL(mmc_try_claim_host);
673 * mmc_release_host - release a host
674 * @host: mmc host to release
676 * Release a MMC host, allowing others to claim the host
677 * for their operations.
679 void mmc_release_host(struct mmc_host *host)
683 WARN_ON(!host->claimed);
685 if (host->ops->disable && host->claim_cnt == 1)
686 host->ops->disable(host);
688 spin_lock_irqsave(&host->lock, flags);
689 if (--host->claim_cnt) {
690 /* Release for nested claim */
691 spin_unlock_irqrestore(&host->lock, flags);
694 host->claimer = NULL;
695 spin_unlock_irqrestore(&host->lock, flags);
699 EXPORT_SYMBOL(mmc_release_host);
702 * Internal function that does the actual ios call to the host driver,
703 * optionally printing some debug output.
705 static inline void mmc_set_ios(struct mmc_host *host)
707 struct mmc_ios *ios = &host->ios;
709 pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u "
710 "width %u timing %u\n",
711 mmc_hostname(host), ios->clock, ios->bus_mode,
712 ios->power_mode, ios->chip_select, ios->vdd,
713 ios->bus_width, ios->timing);
716 mmc_set_ungated(host);
717 host->ops->set_ios(host, ios);
721 * Control chip select pin on a host.
723 void mmc_set_chip_select(struct mmc_host *host, int mode)
725 mmc_host_clk_hold(host);
726 host->ios.chip_select = mode;
728 mmc_host_clk_release(host);
732 * Sets the host clock to the highest possible frequency that
735 static void __mmc_set_clock(struct mmc_host *host, unsigned int hz)
737 WARN_ON(hz < host->f_min);
739 if (hz > host->f_max)
742 host->ios.clock = hz;
746 void mmc_set_clock(struct mmc_host *host, unsigned int hz)
748 mmc_host_clk_hold(host);
749 __mmc_set_clock(host, hz);
750 mmc_host_clk_release(host);
753 #ifdef CONFIG_MMC_CLKGATE
755 * This gates the clock by setting it to 0 Hz.
757 void mmc_gate_clock(struct mmc_host *host)
761 spin_lock_irqsave(&host->clk_lock, flags);
762 host->clk_old = host->ios.clock;
764 host->clk_gated = true;
765 spin_unlock_irqrestore(&host->clk_lock, flags);
770 * This restores the clock from gating by using the cached
773 void mmc_ungate_clock(struct mmc_host *host)
776 * We should previously have gated the clock, so the clock shall
777 * be 0 here! The clock may however be 0 during initialization,
778 * when some request operations are performed before setting
779 * the frequency. When ungate is requested in that situation
780 * we just ignore the call.
783 BUG_ON(host->ios.clock);
784 /* This call will also set host->clk_gated to false */
785 __mmc_set_clock(host, host->clk_old);
789 void mmc_set_ungated(struct mmc_host *host)
794 * We've been given a new frequency while the clock is gated,
795 * so make sure we regard this as ungating it.
797 spin_lock_irqsave(&host->clk_lock, flags);
798 host->clk_gated = false;
799 spin_unlock_irqrestore(&host->clk_lock, flags);
803 void mmc_set_ungated(struct mmc_host *host)
809 * Change the bus mode (open drain/push-pull) of a host.
811 void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode)
813 mmc_host_clk_hold(host);
814 host->ios.bus_mode = mode;
816 mmc_host_clk_release(host);
820 * Change data bus width of a host.
822 void mmc_set_bus_width(struct mmc_host *host, unsigned int width)
824 mmc_host_clk_hold(host);
825 host->ios.bus_width = width;
827 mmc_host_clk_release(host);
831 * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number
833 * @low_bits: prefer low bits in boundary cases
835 * This function returns the OCR bit number according to the provided @vdd
836 * value. If conversion is not possible a negative errno value returned.
838 * Depending on the @low_bits flag the function prefers low or high OCR bits
839 * on boundary voltages. For example,
840 * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33);
841 * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34);
843 * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21).
845 static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits)
847 const int max_bit = ilog2(MMC_VDD_35_36);
850 if (vdd < 1650 || vdd > 3600)
853 if (vdd >= 1650 && vdd <= 1950)
854 return ilog2(MMC_VDD_165_195);
859 /* Base 2000 mV, step 100 mV, bit's base 8. */
860 bit = (vdd - 2000) / 100 + 8;
867 * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask
868 * @vdd_min: minimum voltage value (mV)
869 * @vdd_max: maximum voltage value (mV)
871 * This function returns the OCR mask bits according to the provided @vdd_min
872 * and @vdd_max values. If conversion is not possible the function returns 0.
874 * Notes wrt boundary cases:
875 * This function sets the OCR bits for all boundary voltages, for example
876 * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 |
877 * MMC_VDD_34_35 mask.
879 u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max)
883 if (vdd_max < vdd_min)
886 /* Prefer high bits for the boundary vdd_max values. */
887 vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false);
891 /* Prefer low bits for the boundary vdd_min values. */
892 vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true);
896 /* Fill the mask, from max bit to min bit. */
897 while (vdd_max >= vdd_min)
898 mask |= 1 << vdd_max--;
902 EXPORT_SYMBOL(mmc_vddrange_to_ocrmask);
904 #ifdef CONFIG_REGULATOR
907 * mmc_regulator_get_ocrmask - return mask of supported voltages
908 * @supply: regulator to use
910 * This returns either a negative errno, or a mask of voltages that
911 * can be provided to MMC/SD/SDIO devices using the specified voltage
912 * regulator. This would normally be called before registering the
915 int mmc_regulator_get_ocrmask(struct regulator *supply)
921 count = regulator_count_voltages(supply);
925 for (i = 0; i < count; i++) {
929 vdd_uV = regulator_list_voltage(supply, i);
933 vdd_mV = vdd_uV / 1000;
934 result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV);
939 EXPORT_SYMBOL(mmc_regulator_get_ocrmask);
942 * mmc_regulator_set_ocr - set regulator to match host->ios voltage
943 * @mmc: the host to regulate
944 * @supply: regulator to use
945 * @vdd_bit: zero for power off, else a bit number (host->ios.vdd)
947 * Returns zero on success, else negative errno.
949 * MMC host drivers may use this to enable or disable a regulator using
950 * a particular supply voltage. This would normally be called from the
953 int mmc_regulator_set_ocr(struct mmc_host *mmc,
954 struct regulator *supply,
955 unsigned short vdd_bit)
964 /* REVISIT mmc_vddrange_to_ocrmask() may have set some
965 * bits this regulator doesn't quite support ... don't
966 * be too picky, most cards and regulators are OK with
967 * a 0.1V range goof (it's a small error percentage).
969 tmp = vdd_bit - ilog2(MMC_VDD_165_195);
971 min_uV = 1650 * 1000;
972 max_uV = 1950 * 1000;
974 min_uV = 1900 * 1000 + tmp * 100 * 1000;
975 max_uV = min_uV + 100 * 1000;
978 /* avoid needless changes to this voltage; the regulator
979 * might not allow this operation
981 voltage = regulator_get_voltage(supply);
983 if (mmc->caps2 & MMC_CAP2_BROKEN_VOLTAGE)
984 min_uV = max_uV = voltage;
988 else if (voltage < min_uV || voltage > max_uV)
989 result = regulator_set_voltage(supply, min_uV, max_uV);
993 if (result == 0 && !mmc->regulator_enabled) {
994 result = regulator_enable(supply);
996 mmc->regulator_enabled = true;
998 } else if (mmc->regulator_enabled) {
999 result = regulator_disable(supply);
1001 mmc->regulator_enabled = false;
1005 dev_err(mmc_dev(mmc),
1006 "could not set regulator OCR (%d)\n", result);
1009 EXPORT_SYMBOL(mmc_regulator_set_ocr);
1011 #endif /* CONFIG_REGULATOR */
1014 * Mask off any voltages we don't support and select
1015 * the lowest voltage
1017 u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
1021 ocr &= host->ocr_avail;
1029 mmc_host_clk_hold(host);
1030 host->ios.vdd = bit;
1032 mmc_host_clk_release(host);
1034 pr_warning("%s: host doesn't support card's voltages\n",
1035 mmc_hostname(host));
1042 int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage, bool cmd11)
1044 struct mmc_command cmd = {0};
1050 * Send CMD11 only if the request is to switch the card to
1053 if ((signal_voltage != MMC_SIGNAL_VOLTAGE_330) && cmd11) {
1054 cmd.opcode = SD_SWITCH_VOLTAGE;
1056 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1058 err = mmc_wait_for_cmd(host, &cmd, 0);
1062 if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR))
1066 host->ios.signal_voltage = signal_voltage;
1068 if (host->ops->start_signal_voltage_switch) {
1069 mmc_host_clk_hold(host);
1070 err = host->ops->start_signal_voltage_switch(host, &host->ios);
1071 mmc_host_clk_release(host);
1078 * Select timing parameters for host.
1080 void mmc_set_timing(struct mmc_host *host, unsigned int timing)
1082 mmc_host_clk_hold(host);
1083 host->ios.timing = timing;
1085 mmc_host_clk_release(host);
1089 * Select appropriate driver type for host.
1091 void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type)
1093 mmc_host_clk_hold(host);
1094 host->ios.drv_type = drv_type;
1096 mmc_host_clk_release(host);
1099 static void mmc_poweroff_notify(struct mmc_host *host)
1101 struct mmc_card *card;
1102 unsigned int timeout;
1103 unsigned int notify_type = EXT_CSD_NO_POWER_NOTIFICATION;
1107 mmc_claim_host(host);
1110 * Send power notify command only if card
1111 * is mmc and notify state is powered ON
1113 if (card && mmc_card_mmc(card) &&
1114 (card->poweroff_notify_state == MMC_POWERED_ON)) {
1116 if (host->power_notify_type == MMC_HOST_PW_NOTIFY_SHORT) {
1117 notify_type = EXT_CSD_POWER_OFF_SHORT;
1118 timeout = card->ext_csd.generic_cmd6_time;
1119 card->poweroff_notify_state = MMC_POWEROFF_SHORT;
1121 notify_type = EXT_CSD_POWER_OFF_LONG;
1122 timeout = card->ext_csd.power_off_longtime;
1123 card->poweroff_notify_state = MMC_POWEROFF_LONG;
1126 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1127 EXT_CSD_POWER_OFF_NOTIFICATION,
1128 notify_type, timeout);
1130 if (err && err != -EBADMSG)
1131 pr_err("Device failed to respond within %d poweroff "
1132 "time. Forcefully powering down the device\n",
1135 /* Set the card state to no notification after the poweroff */
1136 card->poweroff_notify_state = MMC_NO_POWER_NOTIFICATION;
1138 mmc_release_host(host);
1142 * Apply power to the MMC stack. This is a two-stage process.
1143 * First, we enable power to the card without the clock running.
1144 * We then wait a bit for the power to stabilise. Finally,
1145 * enable the bus drivers and clock to the card.
1147 * We must _NOT_ enable the clock prior to power stablising.
1149 * If a host does all the power sequencing itself, ignore the
1150 * initial MMC_POWER_UP stage.
1152 static void mmc_power_up(struct mmc_host *host)
1156 mmc_host_clk_hold(host);
1158 /* If ocr is set, we use it */
1160 bit = ffs(host->ocr) - 1;
1162 bit = fls(host->ocr_avail) - 1;
1164 host->ios.vdd = bit;
1165 if (mmc_host_is_spi(host))
1166 host->ios.chip_select = MMC_CS_HIGH;
1168 host->ios.chip_select = MMC_CS_DONTCARE;
1169 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
1170 host->ios.power_mode = MMC_POWER_UP;
1171 host->ios.bus_width = MMC_BUS_WIDTH_1;
1172 host->ios.timing = MMC_TIMING_LEGACY;
1176 * This delay should be sufficient to allow the power supply
1177 * to reach the minimum voltage.
1181 host->ios.clock = host->f_init;
1183 host->ios.power_mode = MMC_POWER_ON;
1187 * This delay must be at least 74 clock sizes, or 1 ms, or the
1188 * time required to reach a stable voltage.
1192 mmc_host_clk_release(host);
1195 void mmc_power_off(struct mmc_host *host)
1198 mmc_host_clk_hold(host);
1200 host->ios.clock = 0;
1204 * For eMMC 4.5 device send AWAKE command before
1205 * POWER_OFF_NOTIFY command, because in sleep state
1206 * eMMC 4.5 devices respond to only RESET and AWAKE cmd
1208 if (host->card && mmc_card_is_sleep(host->card) &&
1209 host->bus_ops->resume) {
1210 err = host->bus_ops->resume(host);
1213 mmc_poweroff_notify(host);
1215 pr_warning("%s: error %d during resume "
1216 "(continue with poweroff sequence)\n",
1217 mmc_hostname(host), err);
1221 * Reset ocr mask to be the highest possible voltage supported for
1222 * this mmc host. This value will be used at next power up.
1224 host->ocr = 1 << (fls(host->ocr_avail) - 1);
1226 if (!mmc_host_is_spi(host)) {
1227 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
1228 host->ios.chip_select = MMC_CS_DONTCARE;
1230 host->ios.power_mode = MMC_POWER_OFF;
1231 host->ios.bus_width = MMC_BUS_WIDTH_1;
1232 host->ios.timing = MMC_TIMING_LEGACY;
1236 * Some configurations, such as the 802.11 SDIO card in the OLPC
1237 * XO-1.5, require a short delay after poweroff before the card
1238 * can be successfully turned on again.
1242 mmc_host_clk_release(host);
1246 * Cleanup when the last reference to the bus operator is dropped.
1248 static void __mmc_release_bus(struct mmc_host *host)
1251 BUG_ON(host->bus_refs);
1252 BUG_ON(!host->bus_dead);
1254 host->bus_ops = NULL;
1258 * Increase reference count of bus operator
1260 static inline void mmc_bus_get(struct mmc_host *host)
1262 unsigned long flags;
1264 spin_lock_irqsave(&host->lock, flags);
1266 spin_unlock_irqrestore(&host->lock, flags);
1270 * Decrease reference count of bus operator and free it if
1271 * it is the last reference.
1273 static inline void mmc_bus_put(struct mmc_host *host)
1275 unsigned long flags;
1277 spin_lock_irqsave(&host->lock, flags);
1279 if ((host->bus_refs == 0) && host->bus_ops)
1280 __mmc_release_bus(host);
1281 spin_unlock_irqrestore(&host->lock, flags);
1285 * Assign a mmc bus handler to a host. Only one bus handler may control a
1286 * host at any given time.
1288 void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops)
1290 unsigned long flags;
1295 WARN_ON(!host->claimed);
1297 spin_lock_irqsave(&host->lock, flags);
1299 BUG_ON(host->bus_ops);
1300 BUG_ON(host->bus_refs);
1302 host->bus_ops = ops;
1306 spin_unlock_irqrestore(&host->lock, flags);
1310 * Remove the current bus handler from a host.
1312 void mmc_detach_bus(struct mmc_host *host)
1314 unsigned long flags;
1318 WARN_ON(!host->claimed);
1319 WARN_ON(!host->bus_ops);
1321 spin_lock_irqsave(&host->lock, flags);
1325 spin_unlock_irqrestore(&host->lock, flags);
1331 * mmc_detect_change - process change of state on a MMC socket
1332 * @host: host which changed state.
1333 * @delay: optional delay to wait before detection (jiffies)
1335 * MMC drivers should call this when they detect a card has been
1336 * inserted or removed. The MMC layer will confirm that any
1337 * present card is still functional, and initialize any newly
1340 void mmc_detect_change(struct mmc_host *host, unsigned long delay)
1342 #ifdef CONFIG_MMC_DEBUG
1343 unsigned long flags;
1344 spin_lock_irqsave(&host->lock, flags);
1345 WARN_ON(host->removed);
1346 spin_unlock_irqrestore(&host->lock, flags);
1348 host->detect_change = 1;
1349 mmc_schedule_delayed_work(&host->detect, delay);
1352 EXPORT_SYMBOL(mmc_detect_change);
1354 void mmc_init_erase(struct mmc_card *card)
1358 if (is_power_of_2(card->erase_size))
1359 card->erase_shift = ffs(card->erase_size) - 1;
1361 card->erase_shift = 0;
1364 * It is possible to erase an arbitrarily large area of an SD or MMC
1365 * card. That is not desirable because it can take a long time
1366 * (minutes) potentially delaying more important I/O, and also the
1367 * timeout calculations become increasingly hugely over-estimated.
1368 * Consequently, 'pref_erase' is defined as a guide to limit erases
1369 * to that size and alignment.
1371 * For SD cards that define Allocation Unit size, limit erases to one
1372 * Allocation Unit at a time. For MMC cards that define High Capacity
1373 * Erase Size, whether it is switched on or not, limit to that size.
1374 * Otherwise just have a stab at a good value. For modern cards it
1375 * will end up being 4MiB. Note that if the value is too small, it
1376 * can end up taking longer to erase.
1378 if (mmc_card_sd(card) && card->ssr.au) {
1379 card->pref_erase = card->ssr.au;
1380 card->erase_shift = ffs(card->ssr.au) - 1;
1381 } else if (card->ext_csd.hc_erase_size) {
1382 card->pref_erase = card->ext_csd.hc_erase_size;
1384 sz = (card->csd.capacity << (card->csd.read_blkbits - 9)) >> 11;
1386 card->pref_erase = 512 * 1024 / 512;
1388 card->pref_erase = 1024 * 1024 / 512;
1390 card->pref_erase = 2 * 1024 * 1024 / 512;
1392 card->pref_erase = 4 * 1024 * 1024 / 512;
1393 if (card->pref_erase < card->erase_size)
1394 card->pref_erase = card->erase_size;
1396 sz = card->pref_erase % card->erase_size;
1398 card->pref_erase += card->erase_size - sz;
1403 static unsigned int mmc_mmc_erase_timeout(struct mmc_card *card,
1404 unsigned int arg, unsigned int qty)
1406 unsigned int erase_timeout;
1408 if (card->ext_csd.erase_group_def & 1) {
1409 /* High Capacity Erase Group Size uses HC timeouts */
1410 if (arg == MMC_TRIM_ARG)
1411 erase_timeout = card->ext_csd.trim_timeout;
1413 erase_timeout = card->ext_csd.hc_erase_timeout;
1415 /* CSD Erase Group Size uses write timeout */
1416 unsigned int mult = (10 << card->csd.r2w_factor);
1417 unsigned int timeout_clks = card->csd.tacc_clks * mult;
1418 unsigned int timeout_us;
1420 /* Avoid overflow: e.g. tacc_ns=80000000 mult=1280 */
1421 if (card->csd.tacc_ns < 1000000)
1422 timeout_us = (card->csd.tacc_ns * mult) / 1000;
1424 timeout_us = (card->csd.tacc_ns / 1000) * mult;
1427 * ios.clock is only a target. The real clock rate might be
1428 * less but not that much less, so fudge it by multiplying by 2.
1431 timeout_us += (timeout_clks * 1000) /
1432 (mmc_host_clk_rate(card->host) / 1000);
1434 erase_timeout = timeout_us / 1000;
1437 * Theoretically, the calculation could underflow so round up
1438 * to 1ms in that case.
1444 /* Multiplier for secure operations */
1445 if (arg & MMC_SECURE_ARGS) {
1446 if (arg == MMC_SECURE_ERASE_ARG)
1447 erase_timeout *= card->ext_csd.sec_erase_mult;
1449 erase_timeout *= card->ext_csd.sec_trim_mult;
1452 erase_timeout *= qty;
1455 * Ensure at least a 1 second timeout for SPI as per
1456 * 'mmc_set_data_timeout()'
1458 if (mmc_host_is_spi(card->host) && erase_timeout < 1000)
1459 erase_timeout = 1000;
1461 return erase_timeout;
1464 static unsigned int mmc_sd_erase_timeout(struct mmc_card *card,
1468 unsigned int erase_timeout;
1470 if (card->ssr.erase_timeout) {
1471 /* Erase timeout specified in SD Status Register (SSR) */
1472 erase_timeout = card->ssr.erase_timeout * qty +
1473 card->ssr.erase_offset;
1476 * Erase timeout not specified in SD Status Register (SSR) so
1477 * use 250ms per write block.
1479 erase_timeout = 250 * qty;
1482 /* Must not be less than 1 second */
1483 if (erase_timeout < 1000)
1484 erase_timeout = 1000;
1486 return erase_timeout;
1489 static unsigned int mmc_erase_timeout(struct mmc_card *card,
1493 if (mmc_card_sd(card))
1494 return mmc_sd_erase_timeout(card, arg, qty);
1496 return mmc_mmc_erase_timeout(card, arg, qty);
1499 static int mmc_do_erase(struct mmc_card *card, unsigned int from,
1500 unsigned int to, unsigned int arg)
1502 struct mmc_command cmd = {0};
1503 unsigned int qty = 0;
1507 * qty is used to calculate the erase timeout which depends on how many
1508 * erase groups (or allocation units in SD terminology) are affected.
1509 * We count erasing part of an erase group as one erase group.
1510 * For SD, the allocation units are always a power of 2. For MMC, the
1511 * erase group size is almost certainly also power of 2, but it does not
1512 * seem to insist on that in the JEDEC standard, so we fall back to
1513 * division in that case. SD may not specify an allocation unit size,
1514 * in which case the timeout is based on the number of write blocks.
1516 * Note that the timeout for secure trim 2 will only be correct if the
1517 * number of erase groups specified is the same as the total of all
1518 * preceding secure trim 1 commands. Since the power may have been
1519 * lost since the secure trim 1 commands occurred, it is generally
1520 * impossible to calculate the secure trim 2 timeout correctly.
1522 if (card->erase_shift)
1523 qty += ((to >> card->erase_shift) -
1524 (from >> card->erase_shift)) + 1;
1525 else if (mmc_card_sd(card))
1526 qty += to - from + 1;
1528 qty += ((to / card->erase_size) -
1529 (from / card->erase_size)) + 1;
1531 if (!mmc_card_blockaddr(card)) {
1536 if (mmc_card_sd(card))
1537 cmd.opcode = SD_ERASE_WR_BLK_START;
1539 cmd.opcode = MMC_ERASE_GROUP_START;
1541 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
1542 err = mmc_wait_for_cmd(card->host, &cmd, 0);
1544 pr_err("mmc_erase: group start error %d, "
1545 "status %#x\n", err, cmd.resp[0]);
1550 memset(&cmd, 0, sizeof(struct mmc_command));
1551 if (mmc_card_sd(card))
1552 cmd.opcode = SD_ERASE_WR_BLK_END;
1554 cmd.opcode = MMC_ERASE_GROUP_END;
1556 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
1557 err = mmc_wait_for_cmd(card->host, &cmd, 0);
1559 pr_err("mmc_erase: group end error %d, status %#x\n",
1565 memset(&cmd, 0, sizeof(struct mmc_command));
1566 cmd.opcode = MMC_ERASE;
1568 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1569 cmd.cmd_timeout_ms = mmc_erase_timeout(card, arg, qty);
1570 err = mmc_wait_for_cmd(card->host, &cmd, 0);
1572 pr_err("mmc_erase: erase error %d, status %#x\n",
1578 if (mmc_host_is_spi(card->host))
1582 memset(&cmd, 0, sizeof(struct mmc_command));
1583 cmd.opcode = MMC_SEND_STATUS;
1584 cmd.arg = card->rca << 16;
1585 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1586 /* Do not retry else we can't see errors */
1587 err = mmc_wait_for_cmd(card->host, &cmd, 0);
1588 if (err || (cmd.resp[0] & 0xFDF92000)) {
1589 pr_err("error %d requesting status %#x\n",
1594 } while (!(cmd.resp[0] & R1_READY_FOR_DATA) ||
1595 R1_CURRENT_STATE(cmd.resp[0]) == R1_STATE_PRG);
1601 * mmc_erase - erase sectors.
1602 * @card: card to erase
1603 * @from: first sector to erase
1604 * @nr: number of sectors to erase
1605 * @arg: erase command argument (SD supports only %MMC_ERASE_ARG)
1607 * Caller must claim host before calling this function.
1609 int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr,
1612 unsigned int rem, to = from + nr;
1614 if (!(card->host->caps & MMC_CAP_ERASE) ||
1615 !(card->csd.cmdclass & CCC_ERASE))
1618 if (!card->erase_size)
1621 if (mmc_card_sd(card) && arg != MMC_ERASE_ARG)
1624 if ((arg & MMC_SECURE_ARGS) &&
1625 !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN))
1628 if ((arg & MMC_TRIM_ARGS) &&
1629 !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN))
1632 if (arg == MMC_SECURE_ERASE_ARG) {
1633 if (from % card->erase_size || nr % card->erase_size)
1637 if (arg == MMC_ERASE_ARG) {
1638 rem = from % card->erase_size;
1640 rem = card->erase_size - rem;
1647 rem = nr % card->erase_size;
1660 /* 'from' and 'to' are inclusive */
1663 return mmc_do_erase(card, from, to, arg);
1665 EXPORT_SYMBOL(mmc_erase);
1667 int mmc_can_erase(struct mmc_card *card)
1669 if ((card->host->caps & MMC_CAP_ERASE) &&
1670 (card->csd.cmdclass & CCC_ERASE) && card->erase_size)
1674 EXPORT_SYMBOL(mmc_can_erase);
1676 int mmc_can_trim(struct mmc_card *card)
1678 if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN)
1680 if (mmc_can_discard(card))
1684 EXPORT_SYMBOL(mmc_can_trim);
1686 int mmc_can_discard(struct mmc_card *card)
1689 * As there's no way to detect the discard support bit at v4.5
1690 * use the s/w feature support filed.
1692 if (card->ext_csd.feature_support & MMC_DISCARD_FEATURE)
1696 EXPORT_SYMBOL(mmc_can_discard);
1698 int mmc_can_sanitize(struct mmc_card *card)
1700 if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_SANITIZE)
1704 EXPORT_SYMBOL(mmc_can_sanitize);
1706 int mmc_can_secure_erase_trim(struct mmc_card *card)
1708 if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN)
1712 EXPORT_SYMBOL(mmc_can_secure_erase_trim);
1714 int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from,
1717 if (!card->erase_size)
1719 if (from % card->erase_size || nr % card->erase_size)
1723 EXPORT_SYMBOL(mmc_erase_group_aligned);
1725 static unsigned int mmc_do_calc_max_discard(struct mmc_card *card,
1728 struct mmc_host *host = card->host;
1729 unsigned int max_discard, x, y, qty = 0, max_qty, timeout;
1730 unsigned int last_timeout = 0;
1732 if (card->erase_shift)
1733 max_qty = UINT_MAX >> card->erase_shift;
1734 else if (mmc_card_sd(card))
1737 max_qty = UINT_MAX / card->erase_size;
1739 /* Find the largest qty with an OK timeout */
1742 for (x = 1; x && x <= max_qty && max_qty - x >= qty; x <<= 1) {
1743 timeout = mmc_erase_timeout(card, arg, qty + x);
1744 if (timeout > host->max_discard_to)
1746 if (timeout < last_timeout)
1748 last_timeout = timeout;
1760 /* Convert qty to sectors */
1761 if (card->erase_shift)
1762 max_discard = --qty << card->erase_shift;
1763 else if (mmc_card_sd(card))
1766 max_discard = --qty * card->erase_size;
1771 unsigned int mmc_calc_max_discard(struct mmc_card *card)
1773 struct mmc_host *host = card->host;
1774 unsigned int max_discard, max_trim;
1776 if (!host->max_discard_to)
1780 * Without erase_group_def set, MMC erase timeout depends on clock
1781 * frequence which can change. In that case, the best choice is
1782 * just the preferred erase size.
1784 if (mmc_card_mmc(card) && !(card->ext_csd.erase_group_def & 1))
1785 return card->pref_erase;
1787 max_discard = mmc_do_calc_max_discard(card, MMC_ERASE_ARG);
1788 if (mmc_can_trim(card)) {
1789 max_trim = mmc_do_calc_max_discard(card, MMC_TRIM_ARG);
1790 if (max_trim < max_discard)
1791 max_discard = max_trim;
1792 } else if (max_discard < card->erase_size) {
1795 pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n",
1796 mmc_hostname(host), max_discard, host->max_discard_to);
1799 EXPORT_SYMBOL(mmc_calc_max_discard);
1801 int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen)
1803 struct mmc_command cmd = {0};
1805 if (mmc_card_blockaddr(card) || mmc_card_ddr_mode(card))
1808 cmd.opcode = MMC_SET_BLOCKLEN;
1810 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
1811 return mmc_wait_for_cmd(card->host, &cmd, 5);
1813 EXPORT_SYMBOL(mmc_set_blocklen);
1815 static void mmc_hw_reset_for_init(struct mmc_host *host)
1817 if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
1819 mmc_host_clk_hold(host);
1820 host->ops->hw_reset(host);
1821 mmc_host_clk_release(host);
1824 int mmc_can_reset(struct mmc_card *card)
1828 if (!mmc_card_mmc(card))
1830 rst_n_function = card->ext_csd.rst_n_function;
1831 if ((rst_n_function & EXT_CSD_RST_N_EN_MASK) != EXT_CSD_RST_N_ENABLED)
1835 EXPORT_SYMBOL(mmc_can_reset);
1837 static int mmc_do_hw_reset(struct mmc_host *host, int check)
1839 struct mmc_card *card = host->card;
1841 if (!host->bus_ops->power_restore)
1844 if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
1850 if (!mmc_can_reset(card))
1853 mmc_host_clk_hold(host);
1854 mmc_set_clock(host, host->f_init);
1856 host->ops->hw_reset(host);
1858 /* If the reset has happened, then a status command will fail */
1860 struct mmc_command cmd = {0};
1863 cmd.opcode = MMC_SEND_STATUS;
1864 if (!mmc_host_is_spi(card->host))
1865 cmd.arg = card->rca << 16;
1866 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
1867 err = mmc_wait_for_cmd(card->host, &cmd, 0);
1869 mmc_host_clk_release(host);
1874 host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_DDR);
1875 if (mmc_host_is_spi(host)) {
1876 host->ios.chip_select = MMC_CS_HIGH;
1877 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
1879 host->ios.chip_select = MMC_CS_DONTCARE;
1880 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
1882 host->ios.bus_width = MMC_BUS_WIDTH_1;
1883 host->ios.timing = MMC_TIMING_LEGACY;
1886 mmc_host_clk_release(host);
1888 return host->bus_ops->power_restore(host);
1891 int mmc_hw_reset(struct mmc_host *host)
1893 return mmc_do_hw_reset(host, 0);
1895 EXPORT_SYMBOL(mmc_hw_reset);
1897 int mmc_hw_reset_check(struct mmc_host *host)
1899 return mmc_do_hw_reset(host, 1);
1901 EXPORT_SYMBOL(mmc_hw_reset_check);
1903 static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq)
1905 host->f_init = freq;
1907 #ifdef CONFIG_MMC_DEBUG
1908 pr_info("%s: %s: trying to init card at %u Hz\n",
1909 mmc_hostname(host), __func__, host->f_init);
1914 * Some eMMCs (with VCCQ always on) may not be reset after power up, so
1915 * do a hardware reset if possible.
1917 mmc_hw_reset_for_init(host);
1919 /* Initialization should be done at 3.3 V I/O voltage. */
1920 mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, 0);
1923 * sdio_reset sends CMD52 to reset card. Since we do not know
1924 * if the card is being re-initialized, just send it. CMD52
1925 * should be ignored by SD/eMMC cards.
1930 mmc_send_if_cond(host, host->ocr_avail);
1932 /* Order's important: probe SDIO, then SD, then MMC */
1933 if (!mmc_attach_sdio(host))
1935 if (!mmc_attach_sd(host))
1937 if (!mmc_attach_mmc(host))
1940 mmc_power_off(host);
1944 int _mmc_detect_card_removed(struct mmc_host *host)
1948 if ((host->caps & MMC_CAP_NONREMOVABLE) || !host->bus_ops->alive)
1951 if (!host->card || mmc_card_removed(host->card))
1954 ret = host->bus_ops->alive(host);
1956 mmc_card_set_removed(host->card);
1957 pr_debug("%s: card remove detected\n", mmc_hostname(host));
1963 int mmc_detect_card_removed(struct mmc_host *host)
1965 struct mmc_card *card = host->card;
1968 WARN_ON(!host->claimed);
1973 ret = mmc_card_removed(card);
1975 * The card will be considered unchanged unless we have been asked to
1976 * detect a change or host requires polling to provide card detection.
1978 if (!host->detect_change && !(host->caps & MMC_CAP_NEEDS_POLL) &&
1979 !(host->caps2 & MMC_CAP2_DETECT_ON_ERR))
1982 host->detect_change = 0;
1984 ret = _mmc_detect_card_removed(host);
1985 if (ret && (host->caps2 & MMC_CAP2_DETECT_ON_ERR)) {
1987 * Schedule a detect work as soon as possible to let a
1988 * rescan handle the card removal.
1990 cancel_delayed_work(&host->detect);
1991 mmc_detect_change(host, 0);
1997 EXPORT_SYMBOL(mmc_detect_card_removed);
1999 void mmc_rescan(struct work_struct *work)
2001 static const unsigned freqs[] = { 400000, 300000, 200000, 100000 };
2002 struct mmc_host *host =
2003 container_of(work, struct mmc_host, detect.work);
2006 if (host->rescan_disable)
2012 * if there is a _removable_ card registered, check whether it is
2015 if (host->bus_ops && host->bus_ops->detect && !host->bus_dead
2016 && !(host->caps & MMC_CAP_NONREMOVABLE))
2017 host->bus_ops->detect(host);
2019 host->detect_change = 0;
2022 * Let mmc_bus_put() free the bus/bus_ops if we've found that
2023 * the card is no longer present.
2028 /* if there still is a card present, stop here */
2029 if (host->bus_ops != NULL) {
2035 * Only we can add a new handler, so it's safe to
2036 * release the lock here.
2040 if (host->ops->get_cd && host->ops->get_cd(host) == 0)
2043 mmc_claim_host(host);
2044 for (i = 0; i < ARRAY_SIZE(freqs); i++) {
2045 if (!mmc_rescan_try_freq(host, max(freqs[i], host->f_min)))
2047 if (freqs[i] <= host->f_min)
2050 mmc_release_host(host);
2053 if (host->caps & MMC_CAP_NEEDS_POLL)
2054 mmc_schedule_delayed_work(&host->detect, HZ);
2057 void mmc_start_host(struct mmc_host *host)
2059 mmc_power_off(host);
2060 mmc_detect_change(host, 0);
2063 void mmc_stop_host(struct mmc_host *host)
2065 #ifdef CONFIG_MMC_DEBUG
2066 unsigned long flags;
2067 spin_lock_irqsave(&host->lock, flags);
2069 spin_unlock_irqrestore(&host->lock, flags);
2072 cancel_delayed_work_sync(&host->detect);
2073 mmc_flush_scheduled_work();
2075 /* clear pm flags now and let card drivers set them as needed */
2079 if (host->bus_ops && !host->bus_dead) {
2080 /* Calling bus_ops->remove() with a claimed host can deadlock */
2081 if (host->bus_ops->remove)
2082 host->bus_ops->remove(host);
2084 mmc_claim_host(host);
2085 mmc_detach_bus(host);
2086 mmc_power_off(host);
2087 mmc_release_host(host);
2095 mmc_power_off(host);
2098 int mmc_power_save_host(struct mmc_host *host)
2102 #ifdef CONFIG_MMC_DEBUG
2103 pr_info("%s: %s: powering down\n", mmc_hostname(host), __func__);
2108 if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) {
2113 if (host->bus_ops->power_save)
2114 ret = host->bus_ops->power_save(host);
2118 mmc_power_off(host);
2122 EXPORT_SYMBOL(mmc_power_save_host);
2124 int mmc_power_restore_host(struct mmc_host *host)
2128 #ifdef CONFIG_MMC_DEBUG
2129 pr_info("%s: %s: powering up\n", mmc_hostname(host), __func__);
2134 if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) {
2140 ret = host->bus_ops->power_restore(host);
2146 EXPORT_SYMBOL(mmc_power_restore_host);
2148 int mmc_card_awake(struct mmc_host *host)
2152 if (host->caps2 & MMC_CAP2_NO_SLEEP_CMD)
2157 if (host->bus_ops && !host->bus_dead && host->bus_ops->awake)
2158 err = host->bus_ops->awake(host);
2164 EXPORT_SYMBOL(mmc_card_awake);
2166 int mmc_card_sleep(struct mmc_host *host)
2170 if (host->caps2 & MMC_CAP2_NO_SLEEP_CMD)
2175 if (host->bus_ops && !host->bus_dead && host->bus_ops->sleep)
2176 err = host->bus_ops->sleep(host);
2182 EXPORT_SYMBOL(mmc_card_sleep);
2184 int mmc_card_can_sleep(struct mmc_host *host)
2186 struct mmc_card *card = host->card;
2188 if (card && mmc_card_mmc(card) && card->ext_csd.rev >= 3)
2192 EXPORT_SYMBOL(mmc_card_can_sleep);
2195 * Flush the cache to the non-volatile storage.
2197 int mmc_flush_cache(struct mmc_card *card)
2199 struct mmc_host *host = card->host;
2202 if (!(host->caps2 & MMC_CAP2_CACHE_CTRL))
2205 if (mmc_card_mmc(card) &&
2206 (card->ext_csd.cache_size > 0) &&
2207 (card->ext_csd.cache_ctrl & 1)) {
2208 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
2209 EXT_CSD_FLUSH_CACHE, 1, 0);
2211 pr_err("%s: cache flush error %d\n",
2212 mmc_hostname(card->host), err);
2217 EXPORT_SYMBOL(mmc_flush_cache);
2220 * Turn the cache ON/OFF.
2221 * Turning the cache OFF shall trigger flushing of the data
2222 * to the non-volatile storage.
2224 int mmc_cache_ctrl(struct mmc_host *host, u8 enable)
2226 struct mmc_card *card = host->card;
2227 unsigned int timeout;
2230 if (!(host->caps2 & MMC_CAP2_CACHE_CTRL) ||
2231 mmc_card_is_removable(host))
2234 if (card && mmc_card_mmc(card) &&
2235 (card->ext_csd.cache_size > 0)) {
2238 if (card->ext_csd.cache_ctrl ^ enable) {
2239 timeout = enable ? card->ext_csd.generic_cmd6_time : 0;
2240 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
2241 EXT_CSD_CACHE_CTRL, enable, timeout);
2243 pr_err("%s: cache %s error %d\n",
2244 mmc_hostname(card->host),
2245 enable ? "on" : "off",
2248 card->ext_csd.cache_ctrl = enable;
2254 EXPORT_SYMBOL(mmc_cache_ctrl);
2259 * mmc_suspend_host - suspend a host
2262 int mmc_suspend_host(struct mmc_host *host)
2266 cancel_delayed_work(&host->detect);
2267 mmc_flush_scheduled_work();
2268 if (mmc_try_claim_host(host)) {
2269 err = mmc_cache_ctrl(host, 0);
2270 mmc_release_host(host);
2279 if (host->bus_ops && !host->bus_dead) {
2282 * A long response time is not acceptable for device drivers
2283 * when doing suspend. Prevent mmc_claim_host in the suspend
2284 * sequence, to potentially wait "forever" by trying to
2285 * pre-claim the host.
2287 if (mmc_try_claim_host(host)) {
2288 if (host->bus_ops->suspend) {
2289 err = host->bus_ops->suspend(host);
2291 mmc_release_host(host);
2293 if (err == -ENOSYS || !host->bus_ops->resume) {
2295 * We simply "remove" the card in this case.
2296 * It will be redetected on resume. (Calling
2297 * bus_ops->remove() with a claimed host can
2300 if (host->bus_ops->remove)
2301 host->bus_ops->remove(host);
2302 mmc_claim_host(host);
2303 mmc_detach_bus(host);
2304 mmc_power_off(host);
2305 mmc_release_host(host);
2315 if (!err && !mmc_card_keep_power(host))
2316 mmc_power_off(host);
2322 EXPORT_SYMBOL(mmc_suspend_host);
2325 * mmc_resume_host - resume a previously suspended host
2328 int mmc_resume_host(struct mmc_host *host)
2333 if (host->bus_ops && !host->bus_dead) {
2334 if (!mmc_card_keep_power(host)) {
2336 mmc_select_voltage(host, host->ocr);
2338 * Tell runtime PM core we just powered up the card,
2339 * since it still believes the card is powered off.
2340 * Note that currently runtime PM is only enabled
2341 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
2343 if (mmc_card_sdio(host->card) &&
2344 (host->caps & MMC_CAP_POWER_OFF_CARD)) {
2345 pm_runtime_disable(&host->card->dev);
2346 pm_runtime_set_active(&host->card->dev);
2347 pm_runtime_enable(&host->card->dev);
2350 BUG_ON(!host->bus_ops->resume);
2351 err = host->bus_ops->resume(host);
2353 pr_warning("%s: error %d during resume "
2354 "(card was removed?)\n",
2355 mmc_hostname(host), err);
2359 host->pm_flags &= ~MMC_PM_KEEP_POWER;
2364 EXPORT_SYMBOL(mmc_resume_host);
2366 /* Do the card removal on suspend if card is assumed removeable
2367 * Do that in pm notifier while userspace isn't yet frozen, so we will be able
2370 int mmc_pm_notify(struct notifier_block *notify_block,
2371 unsigned long mode, void *unused)
2373 struct mmc_host *host = container_of(
2374 notify_block, struct mmc_host, pm_notify);
2375 unsigned long flags;
2379 case PM_HIBERNATION_PREPARE:
2380 case PM_SUSPEND_PREPARE:
2382 spin_lock_irqsave(&host->lock, flags);
2383 host->rescan_disable = 1;
2384 host->power_notify_type = MMC_HOST_PW_NOTIFY_SHORT;
2385 spin_unlock_irqrestore(&host->lock, flags);
2386 cancel_delayed_work_sync(&host->detect);
2388 if (!host->bus_ops || host->bus_ops->suspend)
2391 /* Calling bus_ops->remove() with a claimed host can deadlock */
2392 if (host->bus_ops->remove)
2393 host->bus_ops->remove(host);
2395 mmc_claim_host(host);
2396 mmc_detach_bus(host);
2397 mmc_power_off(host);
2398 mmc_release_host(host);
2402 case PM_POST_SUSPEND:
2403 case PM_POST_HIBERNATION:
2404 case PM_POST_RESTORE:
2406 spin_lock_irqsave(&host->lock, flags);
2407 host->rescan_disable = 0;
2408 host->power_notify_type = MMC_HOST_PW_NOTIFY_LONG;
2409 spin_unlock_irqrestore(&host->lock, flags);
2410 mmc_detect_change(host, 0);
2418 static int __init mmc_init(void)
2422 workqueue = alloc_ordered_workqueue("kmmcd", 0);
2426 ret = mmc_register_bus();
2428 goto destroy_workqueue;
2430 ret = mmc_register_host_class();
2432 goto unregister_bus;
2434 ret = sdio_register_bus();
2436 goto unregister_host_class;
2440 unregister_host_class:
2441 mmc_unregister_host_class();
2443 mmc_unregister_bus();
2445 destroy_workqueue(workqueue);
2450 static void __exit mmc_exit(void)
2452 sdio_unregister_bus();
2453 mmc_unregister_host_class();
2454 mmc_unregister_bus();
2455 destroy_workqueue(workqueue);
2458 subsys_initcall(mmc_init);
2459 module_exit(mmc_exit);
2461 MODULE_LICENSE("GPL");