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 int mmc_assume_removable;
63 int 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) {
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;
191 pr_debug("%s: starting CMD%u arg %08x flags %08x\n",
192 mmc_hostname(host), mrq->cmd->opcode,
193 mrq->cmd->arg, mrq->cmd->flags);
196 pr_debug("%s: blksz %d blocks %d flags %08x "
197 "tsac %d ms nsac %d\n",
198 mmc_hostname(host), mrq->data->blksz,
199 mrq->data->blocks, mrq->data->flags,
200 mrq->data->timeout_ns / 1000000,
201 mrq->data->timeout_clks);
205 pr_debug("%s: CMD%u arg %08x flags %08x\n",
206 mmc_hostname(host), mrq->stop->opcode,
207 mrq->stop->arg, mrq->stop->flags);
210 WARN_ON(!host->claimed);
215 BUG_ON(mrq->data->blksz > host->max_blk_size);
216 BUG_ON(mrq->data->blocks > host->max_blk_count);
217 BUG_ON(mrq->data->blocks * mrq->data->blksz >
220 #ifdef CONFIG_MMC_DEBUG
222 for_each_sg(mrq->data->sg, sg, mrq->data->sg_len, i)
224 BUG_ON(sz != mrq->data->blocks * mrq->data->blksz);
227 mrq->cmd->data = mrq->data;
228 mrq->data->error = 0;
229 mrq->data->mrq = mrq;
231 mrq->data->stop = mrq->stop;
232 mrq->stop->error = 0;
233 mrq->stop->mrq = mrq;
236 mmc_host_clk_hold(host);
237 led_trigger_event(host->led, LED_FULL);
238 host->ops->request(host, mrq);
241 static void mmc_wait_done(struct mmc_request *mrq)
243 complete(&mrq->completion);
246 static void __mmc_start_req(struct mmc_host *host, struct mmc_request *mrq)
248 init_completion(&mrq->completion);
249 mrq->done = mmc_wait_done;
250 mmc_start_request(host, mrq);
253 static void mmc_wait_for_req_done(struct mmc_host *host,
254 struct mmc_request *mrq)
256 struct mmc_command *cmd;
259 wait_for_completion(&mrq->completion);
262 if (!cmd->error || !cmd->retries)
265 pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
266 mmc_hostname(host), cmd->opcode, cmd->error);
269 host->ops->request(host, mrq);
274 * mmc_pre_req - Prepare for a new request
275 * @host: MMC host to prepare command
276 * @mrq: MMC request to prepare for
277 * @is_first_req: true if there is no previous started request
278 * that may run in parellel to this call, otherwise false
280 * mmc_pre_req() is called in prior to mmc_start_req() to let
281 * host prepare for the new request. Preparation of a request may be
282 * performed while another request is running on the host.
284 static void mmc_pre_req(struct mmc_host *host, struct mmc_request *mrq,
287 if (host->ops->pre_req)
288 host->ops->pre_req(host, mrq, is_first_req);
292 * mmc_post_req - Post process a completed request
293 * @host: MMC host to post process command
294 * @mrq: MMC request to post process for
295 * @err: Error, if non zero, clean up any resources made in pre_req
297 * Let the host post process a completed request. Post processing of
298 * a request may be performed while another reuqest is running.
300 static void mmc_post_req(struct mmc_host *host, struct mmc_request *mrq,
303 if (host->ops->post_req)
304 host->ops->post_req(host, mrq, err);
308 * mmc_start_req - start a non-blocking request
309 * @host: MMC host to start command
310 * @areq: async request to start
311 * @error: out parameter returns 0 for success, otherwise non zero
313 * Start a new MMC custom command request for a host.
314 * If there is on ongoing async request wait for completion
315 * of that request and start the new one and return.
316 * Does not wait for the new request to complete.
318 * Returns the completed request, NULL in case of none completed.
319 * Wait for the an ongoing request (previoulsy started) to complete and
320 * return the completed request. If there is no ongoing request, NULL
321 * is returned without waiting. NULL is not an error condition.
323 struct mmc_async_req *mmc_start_req(struct mmc_host *host,
324 struct mmc_async_req *areq, int *error)
327 struct mmc_async_req *data = host->areq;
329 /* Prepare a new request */
331 mmc_pre_req(host, areq->mrq, !host->areq);
334 mmc_wait_for_req_done(host, host->areq->mrq);
335 err = host->areq->err_check(host->card, host->areq);
337 /* post process the completed failed request */
338 mmc_post_req(host, host->areq->mrq, 0);
341 * Cancel the new prepared request, because
342 * it can't run until the failed
343 * request has been properly handled.
345 mmc_post_req(host, areq->mrq, -EINVAL);
353 __mmc_start_req(host, areq->mrq);
356 mmc_post_req(host, host->areq->mrq, 0);
364 EXPORT_SYMBOL(mmc_start_req);
367 * mmc_wait_for_req - start a request and wait for completion
368 * @host: MMC host to start command
369 * @mrq: MMC request to start
371 * Start a new MMC custom command request for a host, and wait
372 * for the command to complete. Does not attempt to parse the
375 void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
377 __mmc_start_req(host, mrq);
378 mmc_wait_for_req_done(host, mrq);
380 EXPORT_SYMBOL(mmc_wait_for_req);
383 * mmc_interrupt_hpi - Issue for High priority Interrupt
384 * @card: the MMC card associated with the HPI transfer
386 * Issued High Priority Interrupt, and check for card status
387 * util out-of prg-state.
389 int mmc_interrupt_hpi(struct mmc_card *card)
396 if (!card->ext_csd.hpi_en) {
397 pr_info("%s: HPI enable bit unset\n", mmc_hostname(card->host));
401 mmc_claim_host(card->host);
402 err = mmc_send_status(card, &status);
404 pr_err("%s: Get card status fail\n", mmc_hostname(card->host));
409 * If the card status is in PRG-state, we can send the HPI command.
411 if (R1_CURRENT_STATE(status) == R1_STATE_PRG) {
414 * We don't know when the HPI command will finish
415 * processing, so we need to resend HPI until out
416 * of prg-state, and keep checking the card status
417 * with SEND_STATUS. If a timeout error occurs when
418 * sending the HPI command, we are already out of
421 err = mmc_send_hpi_cmd(card, &status);
423 pr_debug("%s: abort HPI (%d error)\n",
424 mmc_hostname(card->host), err);
426 err = mmc_send_status(card, &status);
429 } while (R1_CURRENT_STATE(status) == R1_STATE_PRG);
431 pr_debug("%s: Left prg-state\n", mmc_hostname(card->host));
434 mmc_release_host(card->host);
437 EXPORT_SYMBOL(mmc_interrupt_hpi);
440 * mmc_wait_for_cmd - start a command and wait for completion
441 * @host: MMC host to start command
442 * @cmd: MMC command to start
443 * @retries: maximum number of retries
445 * Start a new MMC command for a host, and wait for the command
446 * to complete. Return any error that occurred while the command
447 * was executing. Do not attempt to parse the response.
449 int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries)
451 struct mmc_request mrq = {NULL};
453 WARN_ON(!host->claimed);
455 memset(cmd->resp, 0, sizeof(cmd->resp));
456 cmd->retries = retries;
461 mmc_wait_for_req(host, &mrq);
466 EXPORT_SYMBOL(mmc_wait_for_cmd);
469 * mmc_set_data_timeout - set the timeout for a data command
470 * @data: data phase for command
471 * @card: the MMC card associated with the data transfer
473 * Computes the data timeout parameters according to the
474 * correct algorithm given the card type.
476 void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
481 * SDIO cards only define an upper 1 s limit on access.
483 if (mmc_card_sdio(card)) {
484 data->timeout_ns = 1000000000;
485 data->timeout_clks = 0;
490 * SD cards use a 100 multiplier rather than 10
492 mult = mmc_card_sd(card) ? 100 : 10;
495 * Scale up the multiplier (and therefore the timeout) by
496 * the r2w factor for writes.
498 if (data->flags & MMC_DATA_WRITE)
499 mult <<= card->csd.r2w_factor;
501 data->timeout_ns = card->csd.tacc_ns * mult;
502 data->timeout_clks = card->csd.tacc_clks * mult;
505 * SD cards also have an upper limit on the timeout.
507 if (mmc_card_sd(card)) {
508 unsigned int timeout_us, limit_us;
510 timeout_us = data->timeout_ns / 1000;
511 if (mmc_host_clk_rate(card->host))
512 timeout_us += data->timeout_clks * 1000 /
513 (mmc_host_clk_rate(card->host) / 1000);
515 if (data->flags & MMC_DATA_WRITE)
517 * The limit is really 250 ms, but that is
518 * insufficient for some crappy cards.
525 * SDHC cards always use these fixed values.
527 if (timeout_us > limit_us || mmc_card_blockaddr(card)) {
528 data->timeout_ns = limit_us * 1000;
529 data->timeout_clks = 0;
533 * Some cards need very high timeouts if driven in SPI mode.
534 * The worst observed timeout was 900ms after writing a
535 * continuous stream of data until the internal logic
538 if (mmc_host_is_spi(card->host)) {
539 if (data->flags & MMC_DATA_WRITE) {
540 if (data->timeout_ns < 1000000000)
541 data->timeout_ns = 1000000000; /* 1s */
543 if (data->timeout_ns < 100000000)
544 data->timeout_ns = 100000000; /* 100ms */
548 EXPORT_SYMBOL(mmc_set_data_timeout);
551 * mmc_align_data_size - pads a transfer size to a more optimal value
552 * @card: the MMC card associated with the data transfer
553 * @sz: original transfer size
555 * Pads the original data size with a number of extra bytes in
556 * order to avoid controller bugs and/or performance hits
557 * (e.g. some controllers revert to PIO for certain sizes).
559 * Returns the improved size, which might be unmodified.
561 * Note that this function is only relevant when issuing a
562 * single scatter gather entry.
564 unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz)
567 * FIXME: We don't have a system for the controller to tell
568 * the core about its problems yet, so for now we just 32-bit
571 sz = ((sz + 3) / 4) * 4;
575 EXPORT_SYMBOL(mmc_align_data_size);
578 * mmc_host_enable - enable a host.
579 * @host: mmc host to enable
581 * Hosts that support power saving can use the 'enable' and 'disable'
582 * methods to exit and enter power saving states. For more information
583 * see comments for struct mmc_host_ops.
585 int mmc_host_enable(struct mmc_host *host)
587 if (!(host->caps & MMC_CAP_DISABLE))
590 if (host->en_dis_recurs)
593 if (host->nesting_cnt++)
596 cancel_delayed_work_sync(&host->disable);
601 if (host->ops->enable) {
604 host->en_dis_recurs = 1;
605 err = host->ops->enable(host);
606 host->en_dis_recurs = 0;
609 pr_debug("%s: enable error %d\n",
610 mmc_hostname(host), err);
617 EXPORT_SYMBOL(mmc_host_enable);
619 static int mmc_host_do_disable(struct mmc_host *host, int lazy)
621 if (host->ops->disable) {
624 host->en_dis_recurs = 1;
625 err = host->ops->disable(host, lazy);
626 host->en_dis_recurs = 0;
629 pr_debug("%s: disable error %d\n",
630 mmc_hostname(host), err);
634 unsigned long delay = msecs_to_jiffies(err);
636 mmc_schedule_delayed_work(&host->disable, delay);
644 * mmc_host_disable - disable a host.
645 * @host: mmc host to disable
647 * Hosts that support power saving can use the 'enable' and 'disable'
648 * methods to exit and enter power saving states. For more information
649 * see comments for struct mmc_host_ops.
651 int mmc_host_disable(struct mmc_host *host)
655 if (!(host->caps & MMC_CAP_DISABLE))
658 if (host->en_dis_recurs)
661 if (--host->nesting_cnt)
667 err = mmc_host_do_disable(host, 0);
670 EXPORT_SYMBOL(mmc_host_disable);
673 * __mmc_claim_host - exclusively claim a host
674 * @host: mmc host to claim
675 * @abort: whether or not the operation should be aborted
677 * Claim a host for a set of operations. If @abort is non null and
678 * dereference a non-zero value then this will return prematurely with
679 * that non-zero value without acquiring the lock. Returns zero
680 * with the lock held otherwise.
682 int __mmc_claim_host(struct mmc_host *host, atomic_t *abort)
684 DECLARE_WAITQUEUE(wait, current);
690 add_wait_queue(&host->wq, &wait);
691 spin_lock_irqsave(&host->lock, flags);
693 set_current_state(TASK_UNINTERRUPTIBLE);
694 stop = abort ? atomic_read(abort) : 0;
695 if (stop || !host->claimed || host->claimer == current)
697 spin_unlock_irqrestore(&host->lock, flags);
699 spin_lock_irqsave(&host->lock, flags);
701 set_current_state(TASK_RUNNING);
704 host->claimer = current;
705 host->claim_cnt += 1;
708 spin_unlock_irqrestore(&host->lock, flags);
709 remove_wait_queue(&host->wq, &wait);
711 mmc_host_enable(host);
715 EXPORT_SYMBOL(__mmc_claim_host);
718 * mmc_try_claim_host - try exclusively to claim a host
719 * @host: mmc host to claim
721 * Returns %1 if the host is claimed, %0 otherwise.
723 int mmc_try_claim_host(struct mmc_host *host)
725 int claimed_host = 0;
728 spin_lock_irqsave(&host->lock, flags);
729 if (!host->claimed || host->claimer == current) {
731 host->claimer = current;
732 host->claim_cnt += 1;
735 spin_unlock_irqrestore(&host->lock, flags);
738 EXPORT_SYMBOL(mmc_try_claim_host);
741 * mmc_do_release_host - release a claimed host
742 * @host: mmc host to release
744 * If you successfully claimed a host, this function will
747 void mmc_do_release_host(struct mmc_host *host)
751 spin_lock_irqsave(&host->lock, flags);
752 if (--host->claim_cnt) {
753 /* Release for nested claim */
754 spin_unlock_irqrestore(&host->lock, flags);
757 host->claimer = NULL;
758 spin_unlock_irqrestore(&host->lock, flags);
762 EXPORT_SYMBOL(mmc_do_release_host);
764 void mmc_host_deeper_disable(struct work_struct *work)
766 struct mmc_host *host =
767 container_of(work, struct mmc_host, disable.work);
769 /* If the host is claimed then we do not want to disable it anymore */
770 if (!mmc_try_claim_host(host))
772 mmc_host_do_disable(host, 1);
773 mmc_do_release_host(host);
777 * mmc_host_lazy_disable - lazily disable a host.
778 * @host: mmc host to disable
780 * Hosts that support power saving can use the 'enable' and 'disable'
781 * methods to exit and enter power saving states. For more information
782 * see comments for struct mmc_host_ops.
784 int mmc_host_lazy_disable(struct mmc_host *host)
786 if (!(host->caps & MMC_CAP_DISABLE))
789 if (host->en_dis_recurs)
792 if (--host->nesting_cnt)
798 if (host->disable_delay) {
799 mmc_schedule_delayed_work(&host->disable,
800 msecs_to_jiffies(host->disable_delay));
803 return mmc_host_do_disable(host, 1);
805 EXPORT_SYMBOL(mmc_host_lazy_disable);
808 * mmc_release_host - release a host
809 * @host: mmc host to release
811 * Release a MMC host, allowing others to claim the host
812 * for their operations.
814 void mmc_release_host(struct mmc_host *host)
816 WARN_ON(!host->claimed);
818 mmc_host_lazy_disable(host);
820 mmc_do_release_host(host);
823 EXPORT_SYMBOL(mmc_release_host);
826 * Internal function that does the actual ios call to the host driver,
827 * optionally printing some debug output.
829 static inline void mmc_set_ios(struct mmc_host *host)
831 struct mmc_ios *ios = &host->ios;
833 pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u "
834 "width %u timing %u\n",
835 mmc_hostname(host), ios->clock, ios->bus_mode,
836 ios->power_mode, ios->chip_select, ios->vdd,
837 ios->bus_width, ios->timing);
840 mmc_set_ungated(host);
841 host->ops->set_ios(host, ios);
845 * Control chip select pin on a host.
847 void mmc_set_chip_select(struct mmc_host *host, int mode)
849 mmc_host_clk_hold(host);
850 host->ios.chip_select = mode;
852 mmc_host_clk_release(host);
856 * Sets the host clock to the highest possible frequency that
859 static void __mmc_set_clock(struct mmc_host *host, unsigned int hz)
861 WARN_ON(hz < host->f_min);
863 if (hz > host->f_max)
866 host->ios.clock = hz;
870 void mmc_set_clock(struct mmc_host *host, unsigned int hz)
872 mmc_host_clk_hold(host);
873 __mmc_set_clock(host, hz);
874 mmc_host_clk_release(host);
877 #ifdef CONFIG_MMC_CLKGATE
879 * This gates the clock by setting it to 0 Hz.
881 void mmc_gate_clock(struct mmc_host *host)
885 spin_lock_irqsave(&host->clk_lock, flags);
886 host->clk_old = host->ios.clock;
888 host->clk_gated = true;
889 spin_unlock_irqrestore(&host->clk_lock, flags);
894 * This restores the clock from gating by using the cached
897 void mmc_ungate_clock(struct mmc_host *host)
900 * We should previously have gated the clock, so the clock shall
901 * be 0 here! The clock may however be 0 during initialization,
902 * when some request operations are performed before setting
903 * the frequency. When ungate is requested in that situation
904 * we just ignore the call.
907 BUG_ON(host->ios.clock);
908 /* This call will also set host->clk_gated to false */
909 __mmc_set_clock(host, host->clk_old);
913 void mmc_set_ungated(struct mmc_host *host)
918 * We've been given a new frequency while the clock is gated,
919 * so make sure we regard this as ungating it.
921 spin_lock_irqsave(&host->clk_lock, flags);
922 host->clk_gated = false;
923 spin_unlock_irqrestore(&host->clk_lock, flags);
927 void mmc_set_ungated(struct mmc_host *host)
933 * Change the bus mode (open drain/push-pull) of a host.
935 void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode)
937 mmc_host_clk_hold(host);
938 host->ios.bus_mode = mode;
940 mmc_host_clk_release(host);
944 * Change data bus width of a host.
946 void mmc_set_bus_width(struct mmc_host *host, unsigned int width)
948 mmc_host_clk_hold(host);
949 host->ios.bus_width = width;
951 mmc_host_clk_release(host);
955 * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number
957 * @low_bits: prefer low bits in boundary cases
959 * This function returns the OCR bit number according to the provided @vdd
960 * value. If conversion is not possible a negative errno value returned.
962 * Depending on the @low_bits flag the function prefers low or high OCR bits
963 * on boundary voltages. For example,
964 * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33);
965 * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34);
967 * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21).
969 static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits)
971 const int max_bit = ilog2(MMC_VDD_35_36);
974 if (vdd < 1650 || vdd > 3600)
977 if (vdd >= 1650 && vdd <= 1950)
978 return ilog2(MMC_VDD_165_195);
983 /* Base 2000 mV, step 100 mV, bit's base 8. */
984 bit = (vdd - 2000) / 100 + 8;
991 * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask
992 * @vdd_min: minimum voltage value (mV)
993 * @vdd_max: maximum voltage value (mV)
995 * This function returns the OCR mask bits according to the provided @vdd_min
996 * and @vdd_max values. If conversion is not possible the function returns 0.
998 * Notes wrt boundary cases:
999 * This function sets the OCR bits for all boundary voltages, for example
1000 * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 |
1001 * MMC_VDD_34_35 mask.
1003 u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max)
1007 if (vdd_max < vdd_min)
1010 /* Prefer high bits for the boundary vdd_max values. */
1011 vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false);
1015 /* Prefer low bits for the boundary vdd_min values. */
1016 vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true);
1020 /* Fill the mask, from max bit to min bit. */
1021 while (vdd_max >= vdd_min)
1022 mask |= 1 << vdd_max--;
1026 EXPORT_SYMBOL(mmc_vddrange_to_ocrmask);
1028 #ifdef CONFIG_REGULATOR
1031 * mmc_regulator_get_ocrmask - return mask of supported voltages
1032 * @supply: regulator to use
1034 * This returns either a negative errno, or a mask of voltages that
1035 * can be provided to MMC/SD/SDIO devices using the specified voltage
1036 * regulator. This would normally be called before registering the
1039 int mmc_regulator_get_ocrmask(struct regulator *supply)
1045 count = regulator_count_voltages(supply);
1049 for (i = 0; i < count; i++) {
1053 vdd_uV = regulator_list_voltage(supply, i);
1057 vdd_mV = vdd_uV / 1000;
1058 result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV);
1063 EXPORT_SYMBOL(mmc_regulator_get_ocrmask);
1066 * mmc_regulator_set_ocr - set regulator to match host->ios voltage
1067 * @mmc: the host to regulate
1068 * @supply: regulator to use
1069 * @vdd_bit: zero for power off, else a bit number (host->ios.vdd)
1071 * Returns zero on success, else negative errno.
1073 * MMC host drivers may use this to enable or disable a regulator using
1074 * a particular supply voltage. This would normally be called from the
1077 int mmc_regulator_set_ocr(struct mmc_host *mmc,
1078 struct regulator *supply,
1079 unsigned short vdd_bit)
1088 /* REVISIT mmc_vddrange_to_ocrmask() may have set some
1089 * bits this regulator doesn't quite support ... don't
1090 * be too picky, most cards and regulators are OK with
1091 * a 0.1V range goof (it's a small error percentage).
1093 tmp = vdd_bit - ilog2(MMC_VDD_165_195);
1095 min_uV = 1650 * 1000;
1096 max_uV = 1950 * 1000;
1098 min_uV = 1900 * 1000 + tmp * 100 * 1000;
1099 max_uV = min_uV + 100 * 1000;
1102 /* avoid needless changes to this voltage; the regulator
1103 * might not allow this operation
1105 voltage = regulator_get_voltage(supply);
1108 else if (voltage < min_uV || voltage > max_uV)
1109 result = regulator_set_voltage(supply, min_uV, max_uV);
1113 if (result == 0 && !mmc->regulator_enabled) {
1114 result = regulator_enable(supply);
1116 mmc->regulator_enabled = true;
1118 } else if (mmc->regulator_enabled) {
1119 result = regulator_disable(supply);
1121 mmc->regulator_enabled = false;
1125 dev_err(mmc_dev(mmc),
1126 "could not set regulator OCR (%d)\n", result);
1129 EXPORT_SYMBOL(mmc_regulator_set_ocr);
1131 #endif /* CONFIG_REGULATOR */
1134 * Mask off any voltages we don't support and select
1135 * the lowest voltage
1137 u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
1141 ocr &= host->ocr_avail;
1149 mmc_host_clk_hold(host);
1150 host->ios.vdd = bit;
1152 mmc_host_clk_release(host);
1154 pr_warning("%s: host doesn't support card's voltages\n",
1155 mmc_hostname(host));
1162 int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage, bool cmd11)
1164 struct mmc_command cmd = {0};
1170 * Send CMD11 only if the request is to switch the card to
1173 if ((signal_voltage != MMC_SIGNAL_VOLTAGE_330) && cmd11) {
1174 cmd.opcode = SD_SWITCH_VOLTAGE;
1176 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1178 err = mmc_wait_for_cmd(host, &cmd, 0);
1182 if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR))
1186 host->ios.signal_voltage = signal_voltage;
1188 if (host->ops->start_signal_voltage_switch)
1189 err = host->ops->start_signal_voltage_switch(host, &host->ios);
1195 * Select timing parameters for host.
1197 void mmc_set_timing(struct mmc_host *host, unsigned int timing)
1199 mmc_host_clk_hold(host);
1200 host->ios.timing = timing;
1202 mmc_host_clk_release(host);
1206 * Select appropriate driver type for host.
1208 void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type)
1210 mmc_host_clk_hold(host);
1211 host->ios.drv_type = drv_type;
1213 mmc_host_clk_release(host);
1217 * Apply power to the MMC stack. This is a two-stage process.
1218 * First, we enable power to the card without the clock running.
1219 * We then wait a bit for the power to stabilise. Finally,
1220 * enable the bus drivers and clock to the card.
1222 * We must _NOT_ enable the clock prior to power stablising.
1224 * If a host does all the power sequencing itself, ignore the
1225 * initial MMC_POWER_UP stage.
1227 static void mmc_power_up(struct mmc_host *host)
1231 mmc_host_clk_hold(host);
1233 /* If ocr is set, we use it */
1235 bit = ffs(host->ocr) - 1;
1237 bit = fls(host->ocr_avail) - 1;
1239 host->ios.vdd = bit;
1240 if (mmc_host_is_spi(host))
1241 host->ios.chip_select = MMC_CS_HIGH;
1243 host->ios.chip_select = MMC_CS_DONTCARE;
1244 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
1245 host->ios.power_mode = MMC_POWER_UP;
1246 host->ios.bus_width = MMC_BUS_WIDTH_1;
1247 host->ios.timing = MMC_TIMING_LEGACY;
1251 * This delay should be sufficient to allow the power supply
1252 * to reach the minimum voltage.
1256 host->ios.clock = host->f_init;
1258 host->ios.power_mode = MMC_POWER_ON;
1262 * This delay must be at least 74 clock sizes, or 1 ms, or the
1263 * time required to reach a stable voltage.
1267 mmc_host_clk_release(host);
1270 void mmc_power_off(struct mmc_host *host)
1272 struct mmc_card *card;
1273 unsigned int notify_type;
1274 unsigned int timeout;
1277 mmc_host_clk_hold(host);
1280 host->ios.clock = 0;
1283 if (card && mmc_card_mmc(card) &&
1284 (card->poweroff_notify_state == MMC_POWERED_ON)) {
1286 if (host->power_notify_type == MMC_HOST_PW_NOTIFY_SHORT) {
1287 notify_type = EXT_CSD_POWER_OFF_SHORT;
1288 timeout = card->ext_csd.generic_cmd6_time;
1289 card->poweroff_notify_state = MMC_POWEROFF_SHORT;
1291 notify_type = EXT_CSD_POWER_OFF_LONG;
1292 timeout = card->ext_csd.power_off_longtime;
1293 card->poweroff_notify_state = MMC_POWEROFF_LONG;
1296 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1297 EXT_CSD_POWER_OFF_NOTIFICATION,
1298 notify_type, timeout);
1300 if (err && err != -EBADMSG)
1301 pr_err("Device failed to respond within %d poweroff "
1302 "time. Forcefully powering down the device\n",
1305 /* Set the card state to no notification after the poweroff */
1306 card->poweroff_notify_state = MMC_NO_POWER_NOTIFICATION;
1310 * Reset ocr mask to be the highest possible voltage supported for
1311 * this mmc host. This value will be used at next power up.
1313 host->ocr = 1 << (fls(host->ocr_avail) - 1);
1315 if (!mmc_host_is_spi(host)) {
1316 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
1317 host->ios.chip_select = MMC_CS_DONTCARE;
1319 host->ios.power_mode = MMC_POWER_OFF;
1320 host->ios.bus_width = MMC_BUS_WIDTH_1;
1321 host->ios.timing = MMC_TIMING_LEGACY;
1325 * Some configurations, such as the 802.11 SDIO card in the OLPC
1326 * XO-1.5, require a short delay after poweroff before the card
1327 * can be successfully turned on again.
1331 mmc_host_clk_release(host);
1335 * Cleanup when the last reference to the bus operator is dropped.
1337 static void __mmc_release_bus(struct mmc_host *host)
1340 BUG_ON(host->bus_refs);
1341 BUG_ON(!host->bus_dead);
1343 host->bus_ops = NULL;
1347 * Increase reference count of bus operator
1349 static inline void mmc_bus_get(struct mmc_host *host)
1351 unsigned long flags;
1353 spin_lock_irqsave(&host->lock, flags);
1355 spin_unlock_irqrestore(&host->lock, flags);
1359 * Decrease reference count of bus operator and free it if
1360 * it is the last reference.
1362 static inline void mmc_bus_put(struct mmc_host *host)
1364 unsigned long flags;
1366 spin_lock_irqsave(&host->lock, flags);
1368 if ((host->bus_refs == 0) && host->bus_ops)
1369 __mmc_release_bus(host);
1370 spin_unlock_irqrestore(&host->lock, flags);
1374 * Assign a mmc bus handler to a host. Only one bus handler may control a
1375 * host at any given time.
1377 void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops)
1379 unsigned long flags;
1384 WARN_ON(!host->claimed);
1386 spin_lock_irqsave(&host->lock, flags);
1388 BUG_ON(host->bus_ops);
1389 BUG_ON(host->bus_refs);
1391 host->bus_ops = ops;
1395 spin_unlock_irqrestore(&host->lock, flags);
1399 * Remove the current bus handler from a host.
1401 void mmc_detach_bus(struct mmc_host *host)
1403 unsigned long flags;
1407 WARN_ON(!host->claimed);
1408 WARN_ON(!host->bus_ops);
1410 spin_lock_irqsave(&host->lock, flags);
1414 spin_unlock_irqrestore(&host->lock, flags);
1420 * mmc_detect_change - process change of state on a MMC socket
1421 * @host: host which changed state.
1422 * @delay: optional delay to wait before detection (jiffies)
1424 * MMC drivers should call this when they detect a card has been
1425 * inserted or removed. The MMC layer will confirm that any
1426 * present card is still functional, and initialize any newly
1429 void mmc_detect_change(struct mmc_host *host, unsigned long delay)
1431 #ifdef CONFIG_MMC_DEBUG
1432 unsigned long flags;
1433 spin_lock_irqsave(&host->lock, flags);
1434 WARN_ON(host->removed);
1435 spin_unlock_irqrestore(&host->lock, flags);
1438 mmc_schedule_delayed_work(&host->detect, delay);
1441 EXPORT_SYMBOL(mmc_detect_change);
1443 void mmc_init_erase(struct mmc_card *card)
1447 if (is_power_of_2(card->erase_size))
1448 card->erase_shift = ffs(card->erase_size) - 1;
1450 card->erase_shift = 0;
1453 * It is possible to erase an arbitrarily large area of an SD or MMC
1454 * card. That is not desirable because it can take a long time
1455 * (minutes) potentially delaying more important I/O, and also the
1456 * timeout calculations become increasingly hugely over-estimated.
1457 * Consequently, 'pref_erase' is defined as a guide to limit erases
1458 * to that size and alignment.
1460 * For SD cards that define Allocation Unit size, limit erases to one
1461 * Allocation Unit at a time. For MMC cards that define High Capacity
1462 * Erase Size, whether it is switched on or not, limit to that size.
1463 * Otherwise just have a stab at a good value. For modern cards it
1464 * will end up being 4MiB. Note that if the value is too small, it
1465 * can end up taking longer to erase.
1467 if (mmc_card_sd(card) && card->ssr.au) {
1468 card->pref_erase = card->ssr.au;
1469 card->erase_shift = ffs(card->ssr.au) - 1;
1470 } else if (card->ext_csd.hc_erase_size) {
1471 card->pref_erase = card->ext_csd.hc_erase_size;
1473 sz = (card->csd.capacity << (card->csd.read_blkbits - 9)) >> 11;
1475 card->pref_erase = 512 * 1024 / 512;
1477 card->pref_erase = 1024 * 1024 / 512;
1479 card->pref_erase = 2 * 1024 * 1024 / 512;
1481 card->pref_erase = 4 * 1024 * 1024 / 512;
1482 if (card->pref_erase < card->erase_size)
1483 card->pref_erase = card->erase_size;
1485 sz = card->pref_erase % card->erase_size;
1487 card->pref_erase += card->erase_size - sz;
1492 static unsigned int mmc_mmc_erase_timeout(struct mmc_card *card,
1493 unsigned int arg, unsigned int qty)
1495 unsigned int erase_timeout;
1497 if (card->ext_csd.erase_group_def & 1) {
1498 /* High Capacity Erase Group Size uses HC timeouts */
1499 if (arg == MMC_TRIM_ARG)
1500 erase_timeout = card->ext_csd.trim_timeout;
1502 erase_timeout = card->ext_csd.hc_erase_timeout;
1504 /* CSD Erase Group Size uses write timeout */
1505 unsigned int mult = (10 << card->csd.r2w_factor);
1506 unsigned int timeout_clks = card->csd.tacc_clks * mult;
1507 unsigned int timeout_us;
1509 /* Avoid overflow: e.g. tacc_ns=80000000 mult=1280 */
1510 if (card->csd.tacc_ns < 1000000)
1511 timeout_us = (card->csd.tacc_ns * mult) / 1000;
1513 timeout_us = (card->csd.tacc_ns / 1000) * mult;
1516 * ios.clock is only a target. The real clock rate might be
1517 * less but not that much less, so fudge it by multiplying by 2.
1520 timeout_us += (timeout_clks * 1000) /
1521 (mmc_host_clk_rate(card->host) / 1000);
1523 erase_timeout = timeout_us / 1000;
1526 * Theoretically, the calculation could underflow so round up
1527 * to 1ms in that case.
1533 /* Multiplier for secure operations */
1534 if (arg & MMC_SECURE_ARGS) {
1535 if (arg == MMC_SECURE_ERASE_ARG)
1536 erase_timeout *= card->ext_csd.sec_erase_mult;
1538 erase_timeout *= card->ext_csd.sec_trim_mult;
1541 erase_timeout *= qty;
1544 * Ensure at least a 1 second timeout for SPI as per
1545 * 'mmc_set_data_timeout()'
1547 if (mmc_host_is_spi(card->host) && erase_timeout < 1000)
1548 erase_timeout = 1000;
1550 return erase_timeout;
1553 static unsigned int mmc_sd_erase_timeout(struct mmc_card *card,
1557 unsigned int erase_timeout;
1559 if (card->ssr.erase_timeout) {
1560 /* Erase timeout specified in SD Status Register (SSR) */
1561 erase_timeout = card->ssr.erase_timeout * qty +
1562 card->ssr.erase_offset;
1565 * Erase timeout not specified in SD Status Register (SSR) so
1566 * use 250ms per write block.
1568 erase_timeout = 250 * qty;
1571 /* Must not be less than 1 second */
1572 if (erase_timeout < 1000)
1573 erase_timeout = 1000;
1575 return erase_timeout;
1578 static unsigned int mmc_erase_timeout(struct mmc_card *card,
1582 if (mmc_card_sd(card))
1583 return mmc_sd_erase_timeout(card, arg, qty);
1585 return mmc_mmc_erase_timeout(card, arg, qty);
1588 static int mmc_do_erase(struct mmc_card *card, unsigned int from,
1589 unsigned int to, unsigned int arg)
1591 struct mmc_command cmd = {0};
1592 unsigned int qty = 0;
1596 * qty is used to calculate the erase timeout which depends on how many
1597 * erase groups (or allocation units in SD terminology) are affected.
1598 * We count erasing part of an erase group as one erase group.
1599 * For SD, the allocation units are always a power of 2. For MMC, the
1600 * erase group size is almost certainly also power of 2, but it does not
1601 * seem to insist on that in the JEDEC standard, so we fall back to
1602 * division in that case. SD may not specify an allocation unit size,
1603 * in which case the timeout is based on the number of write blocks.
1605 * Note that the timeout for secure trim 2 will only be correct if the
1606 * number of erase groups specified is the same as the total of all
1607 * preceding secure trim 1 commands. Since the power may have been
1608 * lost since the secure trim 1 commands occurred, it is generally
1609 * impossible to calculate the secure trim 2 timeout correctly.
1611 if (card->erase_shift)
1612 qty += ((to >> card->erase_shift) -
1613 (from >> card->erase_shift)) + 1;
1614 else if (mmc_card_sd(card))
1615 qty += to - from + 1;
1617 qty += ((to / card->erase_size) -
1618 (from / card->erase_size)) + 1;
1620 if (!mmc_card_blockaddr(card)) {
1625 if (mmc_card_sd(card))
1626 cmd.opcode = SD_ERASE_WR_BLK_START;
1628 cmd.opcode = MMC_ERASE_GROUP_START;
1630 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
1631 err = mmc_wait_for_cmd(card->host, &cmd, 0);
1633 pr_err("mmc_erase: group start error %d, "
1634 "status %#x\n", err, cmd.resp[0]);
1639 memset(&cmd, 0, sizeof(struct mmc_command));
1640 if (mmc_card_sd(card))
1641 cmd.opcode = SD_ERASE_WR_BLK_END;
1643 cmd.opcode = MMC_ERASE_GROUP_END;
1645 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
1646 err = mmc_wait_for_cmd(card->host, &cmd, 0);
1648 pr_err("mmc_erase: group end error %d, status %#x\n",
1654 memset(&cmd, 0, sizeof(struct mmc_command));
1655 cmd.opcode = MMC_ERASE;
1657 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1658 cmd.cmd_timeout_ms = mmc_erase_timeout(card, arg, qty);
1659 err = mmc_wait_for_cmd(card->host, &cmd, 0);
1661 pr_err("mmc_erase: erase error %d, status %#x\n",
1667 if (mmc_host_is_spi(card->host))
1671 memset(&cmd, 0, sizeof(struct mmc_command));
1672 cmd.opcode = MMC_SEND_STATUS;
1673 cmd.arg = card->rca << 16;
1674 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1675 /* Do not retry else we can't see errors */
1676 err = mmc_wait_for_cmd(card->host, &cmd, 0);
1677 if (err || (cmd.resp[0] & 0xFDF92000)) {
1678 pr_err("error %d requesting status %#x\n",
1683 } while (!(cmd.resp[0] & R1_READY_FOR_DATA) ||
1684 R1_CURRENT_STATE(cmd.resp[0]) == R1_STATE_PRG);
1690 * mmc_erase - erase sectors.
1691 * @card: card to erase
1692 * @from: first sector to erase
1693 * @nr: number of sectors to erase
1694 * @arg: erase command argument (SD supports only %MMC_ERASE_ARG)
1696 * Caller must claim host before calling this function.
1698 int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr,
1701 unsigned int rem, to = from + nr;
1703 if (!(card->host->caps & MMC_CAP_ERASE) ||
1704 !(card->csd.cmdclass & CCC_ERASE))
1707 if (!card->erase_size)
1710 if (mmc_card_sd(card) && arg != MMC_ERASE_ARG)
1713 if ((arg & MMC_SECURE_ARGS) &&
1714 !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN))
1717 if ((arg & MMC_TRIM_ARGS) &&
1718 !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN))
1721 if (arg == MMC_SECURE_ERASE_ARG) {
1722 if (from % card->erase_size || nr % card->erase_size)
1726 if (arg == MMC_ERASE_ARG) {
1727 rem = from % card->erase_size;
1729 rem = card->erase_size - rem;
1736 rem = nr % card->erase_size;
1749 /* 'from' and 'to' are inclusive */
1752 return mmc_do_erase(card, from, to, arg);
1754 EXPORT_SYMBOL(mmc_erase);
1756 int mmc_can_erase(struct mmc_card *card)
1758 if ((card->host->caps & MMC_CAP_ERASE) &&
1759 (card->csd.cmdclass & CCC_ERASE) && card->erase_size)
1763 EXPORT_SYMBOL(mmc_can_erase);
1765 int mmc_can_trim(struct mmc_card *card)
1767 if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN)
1769 if (mmc_can_discard(card))
1773 EXPORT_SYMBOL(mmc_can_trim);
1775 int mmc_can_discard(struct mmc_card *card)
1778 * As there's no way to detect the discard support bit at v4.5
1779 * use the s/w feature support filed.
1781 if (card->ext_csd.feature_support & MMC_DISCARD_FEATURE)
1785 EXPORT_SYMBOL(mmc_can_discard);
1787 int mmc_can_sanitize(struct mmc_card *card)
1789 if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_SANITIZE)
1793 EXPORT_SYMBOL(mmc_can_sanitize);
1795 int mmc_can_secure_erase_trim(struct mmc_card *card)
1797 if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN)
1801 EXPORT_SYMBOL(mmc_can_secure_erase_trim);
1803 int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from,
1806 if (!card->erase_size)
1808 if (from % card->erase_size || nr % card->erase_size)
1812 EXPORT_SYMBOL(mmc_erase_group_aligned);
1814 static unsigned int mmc_do_calc_max_discard(struct mmc_card *card,
1817 struct mmc_host *host = card->host;
1818 unsigned int max_discard, x, y, qty = 0, max_qty, timeout;
1819 unsigned int last_timeout = 0;
1821 if (card->erase_shift)
1822 max_qty = UINT_MAX >> card->erase_shift;
1823 else if (mmc_card_sd(card))
1826 max_qty = UINT_MAX / card->erase_size;
1828 /* Find the largest qty with an OK timeout */
1831 for (x = 1; x && x <= max_qty && max_qty - x >= qty; x <<= 1) {
1832 timeout = mmc_erase_timeout(card, arg, qty + x);
1833 if (timeout > host->max_discard_to)
1835 if (timeout < last_timeout)
1837 last_timeout = timeout;
1849 /* Convert qty to sectors */
1850 if (card->erase_shift)
1851 max_discard = --qty << card->erase_shift;
1852 else if (mmc_card_sd(card))
1855 max_discard = --qty * card->erase_size;
1860 unsigned int mmc_calc_max_discard(struct mmc_card *card)
1862 struct mmc_host *host = card->host;
1863 unsigned int max_discard, max_trim;
1865 if (!host->max_discard_to)
1869 * Without erase_group_def set, MMC erase timeout depends on clock
1870 * frequence which can change. In that case, the best choice is
1871 * just the preferred erase size.
1873 if (mmc_card_mmc(card) && !(card->ext_csd.erase_group_def & 1))
1874 return card->pref_erase;
1876 max_discard = mmc_do_calc_max_discard(card, MMC_ERASE_ARG);
1877 if (mmc_can_trim(card)) {
1878 max_trim = mmc_do_calc_max_discard(card, MMC_TRIM_ARG);
1879 if (max_trim < max_discard)
1880 max_discard = max_trim;
1881 } else if (max_discard < card->erase_size) {
1884 pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n",
1885 mmc_hostname(host), max_discard, host->max_discard_to);
1888 EXPORT_SYMBOL(mmc_calc_max_discard);
1890 int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen)
1892 struct mmc_command cmd = {0};
1894 if (mmc_card_blockaddr(card) || mmc_card_ddr_mode(card))
1897 cmd.opcode = MMC_SET_BLOCKLEN;
1899 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
1900 return mmc_wait_for_cmd(card->host, &cmd, 5);
1902 EXPORT_SYMBOL(mmc_set_blocklen);
1904 static void mmc_hw_reset_for_init(struct mmc_host *host)
1906 if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
1908 mmc_host_clk_hold(host);
1909 host->ops->hw_reset(host);
1910 mmc_host_clk_release(host);
1913 int mmc_can_reset(struct mmc_card *card)
1917 if (!mmc_card_mmc(card))
1919 rst_n_function = card->ext_csd.rst_n_function;
1920 if ((rst_n_function & EXT_CSD_RST_N_EN_MASK) != EXT_CSD_RST_N_ENABLED)
1924 EXPORT_SYMBOL(mmc_can_reset);
1926 static int mmc_do_hw_reset(struct mmc_host *host, int check)
1928 struct mmc_card *card = host->card;
1930 if (!host->bus_ops->power_restore)
1933 if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
1939 if (!mmc_can_reset(card))
1942 mmc_host_clk_hold(host);
1943 mmc_set_clock(host, host->f_init);
1945 host->ops->hw_reset(host);
1947 /* If the reset has happened, then a status command will fail */
1949 struct mmc_command cmd = {0};
1952 cmd.opcode = MMC_SEND_STATUS;
1953 if (!mmc_host_is_spi(card->host))
1954 cmd.arg = card->rca << 16;
1955 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
1956 err = mmc_wait_for_cmd(card->host, &cmd, 0);
1958 mmc_host_clk_release(host);
1963 host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_DDR);
1964 if (mmc_host_is_spi(host)) {
1965 host->ios.chip_select = MMC_CS_HIGH;
1966 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
1968 host->ios.chip_select = MMC_CS_DONTCARE;
1969 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
1971 host->ios.bus_width = MMC_BUS_WIDTH_1;
1972 host->ios.timing = MMC_TIMING_LEGACY;
1975 mmc_host_clk_release(host);
1977 return host->bus_ops->power_restore(host);
1980 int mmc_hw_reset(struct mmc_host *host)
1982 return mmc_do_hw_reset(host, 0);
1984 EXPORT_SYMBOL(mmc_hw_reset);
1986 int mmc_hw_reset_check(struct mmc_host *host)
1988 return mmc_do_hw_reset(host, 1);
1990 EXPORT_SYMBOL(mmc_hw_reset_check);
1992 static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq)
1994 host->f_init = freq;
1996 #ifdef CONFIG_MMC_DEBUG
1997 pr_info("%s: %s: trying to init card at %u Hz\n",
1998 mmc_hostname(host), __func__, host->f_init);
2003 * Some eMMCs (with VCCQ always on) may not be reset after power up, so
2004 * do a hardware reset if possible.
2006 mmc_hw_reset_for_init(host);
2009 * sdio_reset sends CMD52 to reset card. Since we do not know
2010 * if the card is being re-initialized, just send it. CMD52
2011 * should be ignored by SD/eMMC cards.
2016 mmc_send_if_cond(host, host->ocr_avail);
2018 /* Order's important: probe SDIO, then SD, then MMC */
2019 if (!mmc_attach_sdio(host))
2021 if (!mmc_attach_sd(host))
2023 if (!mmc_attach_mmc(host))
2026 mmc_power_off(host);
2030 void mmc_rescan(struct work_struct *work)
2032 static const unsigned freqs[] = { 400000, 300000, 200000, 100000 };
2033 struct mmc_host *host =
2034 container_of(work, struct mmc_host, detect.work);
2037 if (host->rescan_disable)
2043 * if there is a _removable_ card registered, check whether it is
2046 if (host->bus_ops && host->bus_ops->detect && !host->bus_dead
2047 && !(host->caps & MMC_CAP_NONREMOVABLE))
2048 host->bus_ops->detect(host);
2051 * Let mmc_bus_put() free the bus/bus_ops if we've found that
2052 * the card is no longer present.
2057 /* if there still is a card present, stop here */
2058 if (host->bus_ops != NULL) {
2064 * Only we can add a new handler, so it's safe to
2065 * release the lock here.
2069 if (host->ops->get_cd && host->ops->get_cd(host) == 0)
2072 mmc_claim_host(host);
2073 for (i = 0; i < ARRAY_SIZE(freqs); i++) {
2074 if (!mmc_rescan_try_freq(host, max(freqs[i], host->f_min)))
2076 if (freqs[i] <= host->f_min)
2079 mmc_release_host(host);
2082 if (host->caps & MMC_CAP_NEEDS_POLL)
2083 mmc_schedule_delayed_work(&host->detect, HZ);
2086 void mmc_start_host(struct mmc_host *host)
2088 mmc_power_off(host);
2089 mmc_detect_change(host, 0);
2092 void mmc_stop_host(struct mmc_host *host)
2094 #ifdef CONFIG_MMC_DEBUG
2095 unsigned long flags;
2096 spin_lock_irqsave(&host->lock, flags);
2098 spin_unlock_irqrestore(&host->lock, flags);
2101 if (host->caps & MMC_CAP_DISABLE)
2102 cancel_delayed_work(&host->disable);
2103 cancel_delayed_work_sync(&host->detect);
2104 mmc_flush_scheduled_work();
2106 /* clear pm flags now and let card drivers set them as needed */
2110 if (host->bus_ops && !host->bus_dead) {
2111 if (host->bus_ops->remove)
2112 host->bus_ops->remove(host);
2114 mmc_claim_host(host);
2115 mmc_detach_bus(host);
2116 mmc_power_off(host);
2117 mmc_release_host(host);
2125 mmc_power_off(host);
2128 int mmc_power_save_host(struct mmc_host *host)
2132 #ifdef CONFIG_MMC_DEBUG
2133 pr_info("%s: %s: powering down\n", mmc_hostname(host), __func__);
2138 if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) {
2143 if (host->bus_ops->power_save)
2144 ret = host->bus_ops->power_save(host);
2148 mmc_power_off(host);
2152 EXPORT_SYMBOL(mmc_power_save_host);
2154 int mmc_power_restore_host(struct mmc_host *host)
2158 #ifdef CONFIG_MMC_DEBUG
2159 pr_info("%s: %s: powering up\n", mmc_hostname(host), __func__);
2164 if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) {
2170 ret = host->bus_ops->power_restore(host);
2176 EXPORT_SYMBOL(mmc_power_restore_host);
2178 int mmc_card_awake(struct mmc_host *host)
2184 if (host->bus_ops && !host->bus_dead && host->bus_ops->awake)
2185 err = host->bus_ops->awake(host);
2191 EXPORT_SYMBOL(mmc_card_awake);
2193 int mmc_card_sleep(struct mmc_host *host)
2199 if (host->bus_ops && !host->bus_dead && host->bus_ops->awake)
2200 err = host->bus_ops->sleep(host);
2206 EXPORT_SYMBOL(mmc_card_sleep);
2208 int mmc_card_can_sleep(struct mmc_host *host)
2210 struct mmc_card *card = host->card;
2212 if (card && mmc_card_mmc(card) && card->ext_csd.rev >= 3)
2216 EXPORT_SYMBOL(mmc_card_can_sleep);
2219 * Flush the cache to the non-volatile storage.
2221 int mmc_flush_cache(struct mmc_card *card)
2223 struct mmc_host *host = card->host;
2226 if (!(host->caps2 & MMC_CAP2_CACHE_CTRL))
2229 if (mmc_card_mmc(card) &&
2230 (card->ext_csd.cache_size > 0) &&
2231 (card->ext_csd.cache_ctrl & 1)) {
2232 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
2233 EXT_CSD_FLUSH_CACHE, 1, 0);
2235 pr_err("%s: cache flush error %d\n",
2236 mmc_hostname(card->host), err);
2241 EXPORT_SYMBOL(mmc_flush_cache);
2244 * Turn the cache ON/OFF.
2245 * Turning the cache OFF shall trigger flushing of the data
2246 * to the non-volatile storage.
2248 int mmc_cache_ctrl(struct mmc_host *host, u8 enable)
2250 struct mmc_card *card = host->card;
2253 if (!(host->caps2 & MMC_CAP2_CACHE_CTRL) ||
2254 mmc_card_is_removable(host))
2257 if (card && mmc_card_mmc(card) &&
2258 (card->ext_csd.cache_size > 0)) {
2261 if (card->ext_csd.cache_ctrl ^ enable)
2262 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
2263 EXT_CSD_CACHE_CTRL, enable, 0);
2265 pr_err("%s: cache %s error %d\n",
2266 mmc_hostname(card->host),
2267 enable ? "on" : "off",
2270 card->ext_csd.cache_ctrl = enable;
2275 EXPORT_SYMBOL(mmc_cache_ctrl);
2280 * mmc_suspend_host - suspend a host
2283 int mmc_suspend_host(struct mmc_host *host)
2287 if (host->caps & MMC_CAP_DISABLE)
2288 cancel_delayed_work(&host->disable);
2289 cancel_delayed_work(&host->detect);
2290 mmc_flush_scheduled_work();
2291 err = mmc_cache_ctrl(host, 0);
2296 if (host->bus_ops && !host->bus_dead) {
2299 * A long response time is not acceptable for device drivers
2300 * when doing suspend. Prevent mmc_claim_host in the suspend
2301 * sequence, to potentially wait "forever" by trying to
2302 * pre-claim the host.
2304 if (mmc_try_claim_host(host)) {
2305 if (host->bus_ops->suspend)
2306 err = host->bus_ops->suspend(host);
2307 if (err == -ENOSYS || !host->bus_ops->resume) {
2309 * We simply "remove" the card in this case.
2310 * It will be redetected on resume.
2312 if (host->bus_ops->remove)
2313 host->bus_ops->remove(host);
2314 mmc_claim_host(host);
2315 mmc_detach_bus(host);
2316 mmc_power_off(host);
2317 mmc_release_host(host);
2321 mmc_do_release_host(host);
2328 if (!err && !mmc_card_keep_power(host))
2329 mmc_power_off(host);
2335 EXPORT_SYMBOL(mmc_suspend_host);
2338 * mmc_resume_host - resume a previously suspended host
2341 int mmc_resume_host(struct mmc_host *host)
2346 if (host->bus_ops && !host->bus_dead) {
2347 if (!mmc_card_keep_power(host)) {
2349 mmc_select_voltage(host, host->ocr);
2351 * Tell runtime PM core we just powered up the card,
2352 * since it still believes the card is powered off.
2353 * Note that currently runtime PM is only enabled
2354 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
2356 if (mmc_card_sdio(host->card) &&
2357 (host->caps & MMC_CAP_POWER_OFF_CARD)) {
2358 pm_runtime_disable(&host->card->dev);
2359 pm_runtime_set_active(&host->card->dev);
2360 pm_runtime_enable(&host->card->dev);
2363 BUG_ON(!host->bus_ops->resume);
2364 err = host->bus_ops->resume(host);
2366 pr_warning("%s: error %d during resume "
2367 "(card was removed?)\n",
2368 mmc_hostname(host), err);
2372 host->pm_flags &= ~MMC_PM_KEEP_POWER;
2377 EXPORT_SYMBOL(mmc_resume_host);
2379 /* Do the card removal on suspend if card is assumed removeable
2380 * Do that in pm notifier while userspace isn't yet frozen, so we will be able
2383 int mmc_pm_notify(struct notifier_block *notify_block,
2384 unsigned long mode, void *unused)
2386 struct mmc_host *host = container_of(
2387 notify_block, struct mmc_host, pm_notify);
2388 unsigned long flags;
2392 case PM_HIBERNATION_PREPARE:
2393 case PM_SUSPEND_PREPARE:
2395 spin_lock_irqsave(&host->lock, flags);
2396 host->rescan_disable = 1;
2397 host->power_notify_type = MMC_HOST_PW_NOTIFY_SHORT;
2398 spin_unlock_irqrestore(&host->lock, flags);
2399 cancel_delayed_work_sync(&host->detect);
2401 if (!host->bus_ops || host->bus_ops->suspend)
2404 mmc_claim_host(host);
2406 if (host->bus_ops->remove)
2407 host->bus_ops->remove(host);
2409 mmc_detach_bus(host);
2410 mmc_power_off(host);
2411 mmc_release_host(host);
2415 case PM_POST_SUSPEND:
2416 case PM_POST_HIBERNATION:
2417 case PM_POST_RESTORE:
2419 spin_lock_irqsave(&host->lock, flags);
2420 host->rescan_disable = 0;
2421 host->power_notify_type = MMC_HOST_PW_NOTIFY_LONG;
2422 spin_unlock_irqrestore(&host->lock, flags);
2423 mmc_detect_change(host, 0);
2431 static int __init mmc_init(void)
2435 workqueue = alloc_ordered_workqueue("kmmcd", 0);
2439 ret = mmc_register_bus();
2441 goto destroy_workqueue;
2443 ret = mmc_register_host_class();
2445 goto unregister_bus;
2447 ret = sdio_register_bus();
2449 goto unregister_host_class;
2453 unregister_host_class:
2454 mmc_unregister_host_class();
2456 mmc_unregister_bus();
2458 destroy_workqueue(workqueue);
2463 static void __exit mmc_exit(void)
2465 sdio_unregister_bus();
2466 mmc_unregister_host_class();
2467 mmc_unregister_bus();
2468 destroy_workqueue(workqueue);
2471 subsys_initcall(mmc_init);
2472 module_exit(mmc_exit);
2474 MODULE_LICENSE("GPL");