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 void __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);
264 static void mmc_wait_for_req_done(struct mmc_host *host,
265 struct mmc_request *mrq)
267 struct mmc_command *cmd;
270 wait_for_completion(&mrq->completion);
273 if (!cmd->error || !cmd->retries ||
274 mmc_card_removed(host->card))
277 pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
278 mmc_hostname(host), cmd->opcode, cmd->error);
281 host->ops->request(host, mrq);
286 * mmc_pre_req - Prepare for a new request
287 * @host: MMC host to prepare command
288 * @mrq: MMC request to prepare for
289 * @is_first_req: true if there is no previous started request
290 * that may run in parellel to this call, otherwise false
292 * mmc_pre_req() is called in prior to mmc_start_req() to let
293 * host prepare for the new request. Preparation of a request may be
294 * performed while another request is running on the host.
296 static void mmc_pre_req(struct mmc_host *host, struct mmc_request *mrq,
299 if (host->ops->pre_req) {
300 mmc_host_clk_hold(host);
301 host->ops->pre_req(host, mrq, is_first_req);
302 mmc_host_clk_release(host);
307 * mmc_post_req - Post process a completed request
308 * @host: MMC host to post process command
309 * @mrq: MMC request to post process for
310 * @err: Error, if non zero, clean up any resources made in pre_req
312 * Let the host post process a completed request. Post processing of
313 * a request may be performed while another reuqest is running.
315 static void mmc_post_req(struct mmc_host *host, struct mmc_request *mrq,
318 if (host->ops->post_req) {
319 mmc_host_clk_hold(host);
320 host->ops->post_req(host, mrq, err);
321 mmc_host_clk_release(host);
326 * mmc_start_req - start a non-blocking request
327 * @host: MMC host to start command
328 * @areq: async request to start
329 * @error: out parameter returns 0 for success, otherwise non zero
331 * Start a new MMC custom command request for a host.
332 * If there is on ongoing async request wait for completion
333 * of that request and start the new one and return.
334 * Does not wait for the new request to complete.
336 * Returns the completed request, NULL in case of none completed.
337 * Wait for the an ongoing request (previoulsy started) to complete and
338 * return the completed request. If there is no ongoing request, NULL
339 * is returned without waiting. NULL is not an error condition.
341 struct mmc_async_req *mmc_start_req(struct mmc_host *host,
342 struct mmc_async_req *areq, int *error)
345 struct mmc_async_req *data = host->areq;
347 /* Prepare a new request */
349 mmc_pre_req(host, areq->mrq, !host->areq);
352 mmc_wait_for_req_done(host, host->areq->mrq);
353 err = host->areq->err_check(host->card, host->areq);
355 /* post process the completed failed request */
356 mmc_post_req(host, host->areq->mrq, 0);
359 * Cancel the new prepared request, because
360 * it can't run until the failed
361 * request has been properly handled.
363 mmc_post_req(host, areq->mrq, -EINVAL);
371 __mmc_start_req(host, areq->mrq);
374 mmc_post_req(host, host->areq->mrq, 0);
382 EXPORT_SYMBOL(mmc_start_req);
385 * mmc_wait_for_req - start a request and wait for completion
386 * @host: MMC host to start command
387 * @mrq: MMC request to start
389 * Start a new MMC custom command request for a host, and wait
390 * for the command to complete. Does not attempt to parse the
393 void mmc_wait_for_req(struct mmc_host *host, struct mmc_request *mrq)
395 __mmc_start_req(host, mrq);
396 mmc_wait_for_req_done(host, mrq);
398 EXPORT_SYMBOL(mmc_wait_for_req);
401 * mmc_interrupt_hpi - Issue for High priority Interrupt
402 * @card: the MMC card associated with the HPI transfer
404 * Issued High Priority Interrupt, and check for card status
405 * util out-of prg-state.
407 int mmc_interrupt_hpi(struct mmc_card *card)
414 if (!card->ext_csd.hpi_en) {
415 pr_info("%s: HPI enable bit unset\n", mmc_hostname(card->host));
419 mmc_claim_host(card->host);
420 err = mmc_send_status(card, &status);
422 pr_err("%s: Get card status fail\n", mmc_hostname(card->host));
427 * If the card status is in PRG-state, we can send the HPI command.
429 if (R1_CURRENT_STATE(status) == R1_STATE_PRG) {
432 * We don't know when the HPI command will finish
433 * processing, so we need to resend HPI until out
434 * of prg-state, and keep checking the card status
435 * with SEND_STATUS. If a timeout error occurs when
436 * sending the HPI command, we are already out of
439 err = mmc_send_hpi_cmd(card, &status);
441 pr_debug("%s: abort HPI (%d error)\n",
442 mmc_hostname(card->host), err);
444 err = mmc_send_status(card, &status);
447 } while (R1_CURRENT_STATE(status) == R1_STATE_PRG);
449 pr_debug("%s: Left prg-state\n", mmc_hostname(card->host));
452 mmc_release_host(card->host);
455 EXPORT_SYMBOL(mmc_interrupt_hpi);
458 * mmc_wait_for_cmd - start a command and wait for completion
459 * @host: MMC host to start command
460 * @cmd: MMC command to start
461 * @retries: maximum number of retries
463 * Start a new MMC command for a host, and wait for the command
464 * to complete. Return any error that occurred while the command
465 * was executing. Do not attempt to parse the response.
467 int mmc_wait_for_cmd(struct mmc_host *host, struct mmc_command *cmd, int retries)
469 struct mmc_request mrq = {NULL};
471 WARN_ON(!host->claimed);
473 memset(cmd->resp, 0, sizeof(cmd->resp));
474 cmd->retries = retries;
479 mmc_wait_for_req(host, &mrq);
484 EXPORT_SYMBOL(mmc_wait_for_cmd);
487 * mmc_set_data_timeout - set the timeout for a data command
488 * @data: data phase for command
489 * @card: the MMC card associated with the data transfer
491 * Computes the data timeout parameters according to the
492 * correct algorithm given the card type.
494 void mmc_set_data_timeout(struct mmc_data *data, const struct mmc_card *card)
499 * SDIO cards only define an upper 1 s limit on access.
501 if (mmc_card_sdio(card)) {
502 data->timeout_ns = 1000000000;
503 data->timeout_clks = 0;
508 * SD cards use a 100 multiplier rather than 10
510 mult = mmc_card_sd(card) ? 100 : 10;
513 * Scale up the multiplier (and therefore the timeout) by
514 * the r2w factor for writes.
516 if (data->flags & MMC_DATA_WRITE)
517 mult <<= card->csd.r2w_factor;
519 data->timeout_ns = card->csd.tacc_ns * mult;
520 data->timeout_clks = card->csd.tacc_clks * mult;
523 * SD cards also have an upper limit on the timeout.
525 if (mmc_card_sd(card)) {
526 unsigned int timeout_us, limit_us;
528 timeout_us = data->timeout_ns / 1000;
529 if (mmc_host_clk_rate(card->host))
530 timeout_us += data->timeout_clks * 1000 /
531 (mmc_host_clk_rate(card->host) / 1000);
533 if (data->flags & MMC_DATA_WRITE)
535 * The limit is really 250 ms, but that is
536 * insufficient for some crappy cards.
543 * SDHC cards always use these fixed values.
545 if (timeout_us > limit_us || mmc_card_blockaddr(card)) {
546 data->timeout_ns = limit_us * 1000;
547 data->timeout_clks = 0;
552 * Some cards require longer data read timeout than indicated in CSD.
553 * Address this by setting the read timeout to a "reasonably high"
554 * value. For the cards tested, 300ms has proven enough. If necessary,
555 * this value can be increased if other problematic cards require this.
557 if (mmc_card_long_read_time(card) && data->flags & MMC_DATA_READ) {
558 data->timeout_ns = 300000000;
559 data->timeout_clks = 0;
563 * Some cards need very high timeouts if driven in SPI mode.
564 * The worst observed timeout was 900ms after writing a
565 * continuous stream of data until the internal logic
568 if (mmc_host_is_spi(card->host)) {
569 if (data->flags & MMC_DATA_WRITE) {
570 if (data->timeout_ns < 1000000000)
571 data->timeout_ns = 1000000000; /* 1s */
573 if (data->timeout_ns < 100000000)
574 data->timeout_ns = 100000000; /* 100ms */
578 EXPORT_SYMBOL(mmc_set_data_timeout);
581 * mmc_align_data_size - pads a transfer size to a more optimal value
582 * @card: the MMC card associated with the data transfer
583 * @sz: original transfer size
585 * Pads the original data size with a number of extra bytes in
586 * order to avoid controller bugs and/or performance hits
587 * (e.g. some controllers revert to PIO for certain sizes).
589 * Returns the improved size, which might be unmodified.
591 * Note that this function is only relevant when issuing a
592 * single scatter gather entry.
594 unsigned int mmc_align_data_size(struct mmc_card *card, unsigned int sz)
597 * FIXME: We don't have a system for the controller to tell
598 * the core about its problems yet, so for now we just 32-bit
601 sz = ((sz + 3) / 4) * 4;
605 EXPORT_SYMBOL(mmc_align_data_size);
608 * __mmc_claim_host - exclusively claim a host
609 * @host: mmc host to claim
610 * @abort: whether or not the operation should be aborted
612 * Claim a host for a set of operations. If @abort is non null and
613 * dereference a non-zero value then this will return prematurely with
614 * that non-zero value without acquiring the lock. Returns zero
615 * with the lock held otherwise.
617 int __mmc_claim_host(struct mmc_host *host, atomic_t *abort)
619 DECLARE_WAITQUEUE(wait, current);
625 add_wait_queue(&host->wq, &wait);
626 spin_lock_irqsave(&host->lock, flags);
628 set_current_state(TASK_UNINTERRUPTIBLE);
629 stop = abort ? atomic_read(abort) : 0;
630 if (stop || !host->claimed || host->claimer == current)
632 spin_unlock_irqrestore(&host->lock, flags);
634 spin_lock_irqsave(&host->lock, flags);
636 set_current_state(TASK_RUNNING);
639 host->claimer = current;
640 host->claim_cnt += 1;
643 spin_unlock_irqrestore(&host->lock, flags);
644 remove_wait_queue(&host->wq, &wait);
645 if (host->ops->enable && !stop && host->claim_cnt == 1)
646 host->ops->enable(host);
650 EXPORT_SYMBOL(__mmc_claim_host);
653 * mmc_try_claim_host - try exclusively to claim a host
654 * @host: mmc host to claim
656 * Returns %1 if the host is claimed, %0 otherwise.
658 int mmc_try_claim_host(struct mmc_host *host)
660 int claimed_host = 0;
663 spin_lock_irqsave(&host->lock, flags);
664 if (!host->claimed || host->claimer == current) {
666 host->claimer = current;
667 host->claim_cnt += 1;
670 spin_unlock_irqrestore(&host->lock, flags);
671 if (host->ops->enable && claimed_host && host->claim_cnt == 1)
672 host->ops->enable(host);
675 EXPORT_SYMBOL(mmc_try_claim_host);
678 * mmc_release_host - release a host
679 * @host: mmc host to release
681 * Release a MMC host, allowing others to claim the host
682 * for their operations.
684 void mmc_release_host(struct mmc_host *host)
688 WARN_ON(!host->claimed);
690 if (host->ops->disable && host->claim_cnt == 1)
691 host->ops->disable(host);
693 spin_lock_irqsave(&host->lock, flags);
694 if (--host->claim_cnt) {
695 /* Release for nested claim */
696 spin_unlock_irqrestore(&host->lock, flags);
699 host->claimer = NULL;
700 spin_unlock_irqrestore(&host->lock, flags);
704 EXPORT_SYMBOL(mmc_release_host);
707 * Internal function that does the actual ios call to the host driver,
708 * optionally printing some debug output.
710 static inline void mmc_set_ios(struct mmc_host *host)
712 struct mmc_ios *ios = &host->ios;
714 pr_debug("%s: clock %uHz busmode %u powermode %u cs %u Vdd %u "
715 "width %u timing %u\n",
716 mmc_hostname(host), ios->clock, ios->bus_mode,
717 ios->power_mode, ios->chip_select, ios->vdd,
718 ios->bus_width, ios->timing);
721 mmc_set_ungated(host);
722 host->ops->set_ios(host, ios);
726 * Control chip select pin on a host.
728 void mmc_set_chip_select(struct mmc_host *host, int mode)
730 mmc_host_clk_hold(host);
731 host->ios.chip_select = mode;
733 mmc_host_clk_release(host);
737 * Sets the host clock to the highest possible frequency that
740 static void __mmc_set_clock(struct mmc_host *host, unsigned int hz)
742 WARN_ON(hz < host->f_min);
744 if (hz > host->f_max)
747 host->ios.clock = hz;
751 void mmc_set_clock(struct mmc_host *host, unsigned int hz)
753 mmc_host_clk_hold(host);
754 __mmc_set_clock(host, hz);
755 mmc_host_clk_release(host);
758 #ifdef CONFIG_MMC_CLKGATE
760 * This gates the clock by setting it to 0 Hz.
762 void mmc_gate_clock(struct mmc_host *host)
766 spin_lock_irqsave(&host->clk_lock, flags);
767 host->clk_old = host->ios.clock;
769 host->clk_gated = true;
770 spin_unlock_irqrestore(&host->clk_lock, flags);
775 * This restores the clock from gating by using the cached
778 void mmc_ungate_clock(struct mmc_host *host)
781 * We should previously have gated the clock, so the clock shall
782 * be 0 here! The clock may however be 0 during initialization,
783 * when some request operations are performed before setting
784 * the frequency. When ungate is requested in that situation
785 * we just ignore the call.
788 BUG_ON(host->ios.clock);
789 /* This call will also set host->clk_gated to false */
790 __mmc_set_clock(host, host->clk_old);
794 void mmc_set_ungated(struct mmc_host *host)
799 * We've been given a new frequency while the clock is gated,
800 * so make sure we regard this as ungating it.
802 spin_lock_irqsave(&host->clk_lock, flags);
803 host->clk_gated = false;
804 spin_unlock_irqrestore(&host->clk_lock, flags);
808 void mmc_set_ungated(struct mmc_host *host)
814 * Change the bus mode (open drain/push-pull) of a host.
816 void mmc_set_bus_mode(struct mmc_host *host, unsigned int mode)
818 mmc_host_clk_hold(host);
819 host->ios.bus_mode = mode;
821 mmc_host_clk_release(host);
825 * Change data bus width of a host.
827 void mmc_set_bus_width(struct mmc_host *host, unsigned int width)
829 mmc_host_clk_hold(host);
830 host->ios.bus_width = width;
832 mmc_host_clk_release(host);
836 * mmc_vdd_to_ocrbitnum - Convert a voltage to the OCR bit number
838 * @low_bits: prefer low bits in boundary cases
840 * This function returns the OCR bit number according to the provided @vdd
841 * value. If conversion is not possible a negative errno value returned.
843 * Depending on the @low_bits flag the function prefers low or high OCR bits
844 * on boundary voltages. For example,
845 * with @low_bits = true, 3300 mV translates to ilog2(MMC_VDD_32_33);
846 * with @low_bits = false, 3300 mV translates to ilog2(MMC_VDD_33_34);
848 * Any value in the [1951:1999] range translates to the ilog2(MMC_VDD_20_21).
850 static int mmc_vdd_to_ocrbitnum(int vdd, bool low_bits)
852 const int max_bit = ilog2(MMC_VDD_35_36);
855 if (vdd < 1650 || vdd > 3600)
858 if (vdd >= 1650 && vdd <= 1950)
859 return ilog2(MMC_VDD_165_195);
864 /* Base 2000 mV, step 100 mV, bit's base 8. */
865 bit = (vdd - 2000) / 100 + 8;
872 * mmc_vddrange_to_ocrmask - Convert a voltage range to the OCR mask
873 * @vdd_min: minimum voltage value (mV)
874 * @vdd_max: maximum voltage value (mV)
876 * This function returns the OCR mask bits according to the provided @vdd_min
877 * and @vdd_max values. If conversion is not possible the function returns 0.
879 * Notes wrt boundary cases:
880 * This function sets the OCR bits for all boundary voltages, for example
881 * [3300:3400] range is translated to MMC_VDD_32_33 | MMC_VDD_33_34 |
882 * MMC_VDD_34_35 mask.
884 u32 mmc_vddrange_to_ocrmask(int vdd_min, int vdd_max)
888 if (vdd_max < vdd_min)
891 /* Prefer high bits for the boundary vdd_max values. */
892 vdd_max = mmc_vdd_to_ocrbitnum(vdd_max, false);
896 /* Prefer low bits for the boundary vdd_min values. */
897 vdd_min = mmc_vdd_to_ocrbitnum(vdd_min, true);
901 /* Fill the mask, from max bit to min bit. */
902 while (vdd_max >= vdd_min)
903 mask |= 1 << vdd_max--;
907 EXPORT_SYMBOL(mmc_vddrange_to_ocrmask);
909 #ifdef CONFIG_REGULATOR
912 * mmc_regulator_get_ocrmask - return mask of supported voltages
913 * @supply: regulator to use
915 * This returns either a negative errno, or a mask of voltages that
916 * can be provided to MMC/SD/SDIO devices using the specified voltage
917 * regulator. This would normally be called before registering the
920 int mmc_regulator_get_ocrmask(struct regulator *supply)
926 count = regulator_count_voltages(supply);
930 for (i = 0; i < count; i++) {
934 vdd_uV = regulator_list_voltage(supply, i);
938 vdd_mV = vdd_uV / 1000;
939 result |= mmc_vddrange_to_ocrmask(vdd_mV, vdd_mV);
944 EXPORT_SYMBOL(mmc_regulator_get_ocrmask);
947 * mmc_regulator_set_ocr - set regulator to match host->ios voltage
948 * @mmc: the host to regulate
949 * @supply: regulator to use
950 * @vdd_bit: zero for power off, else a bit number (host->ios.vdd)
952 * Returns zero on success, else negative errno.
954 * MMC host drivers may use this to enable or disable a regulator using
955 * a particular supply voltage. This would normally be called from the
958 int mmc_regulator_set_ocr(struct mmc_host *mmc,
959 struct regulator *supply,
960 unsigned short vdd_bit)
969 /* REVISIT mmc_vddrange_to_ocrmask() may have set some
970 * bits this regulator doesn't quite support ... don't
971 * be too picky, most cards and regulators are OK with
972 * a 0.1V range goof (it's a small error percentage).
974 tmp = vdd_bit - ilog2(MMC_VDD_165_195);
976 min_uV = 1650 * 1000;
977 max_uV = 1950 * 1000;
979 min_uV = 1900 * 1000 + tmp * 100 * 1000;
980 max_uV = min_uV + 100 * 1000;
983 /* avoid needless changes to this voltage; the regulator
984 * might not allow this operation
986 voltage = regulator_get_voltage(supply);
988 if (mmc->caps2 & MMC_CAP2_BROKEN_VOLTAGE)
989 min_uV = max_uV = voltage;
993 else if (voltage < min_uV || voltage > max_uV)
994 result = regulator_set_voltage(supply, min_uV, max_uV);
998 if (result == 0 && !mmc->regulator_enabled) {
999 result = regulator_enable(supply);
1001 mmc->regulator_enabled = true;
1003 } else if (mmc->regulator_enabled) {
1004 result = regulator_disable(supply);
1006 mmc->regulator_enabled = false;
1010 dev_err(mmc_dev(mmc),
1011 "could not set regulator OCR (%d)\n", result);
1014 EXPORT_SYMBOL(mmc_regulator_set_ocr);
1016 #endif /* CONFIG_REGULATOR */
1019 * Mask off any voltages we don't support and select
1020 * the lowest voltage
1022 u32 mmc_select_voltage(struct mmc_host *host, u32 ocr)
1026 ocr &= host->ocr_avail;
1034 mmc_host_clk_hold(host);
1035 host->ios.vdd = bit;
1037 mmc_host_clk_release(host);
1039 pr_warning("%s: host doesn't support card's voltages\n",
1040 mmc_hostname(host));
1047 int mmc_set_signal_voltage(struct mmc_host *host, int signal_voltage, bool cmd11)
1049 struct mmc_command cmd = {0};
1055 * Send CMD11 only if the request is to switch the card to
1058 if ((signal_voltage != MMC_SIGNAL_VOLTAGE_330) && cmd11) {
1059 cmd.opcode = SD_SWITCH_VOLTAGE;
1061 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1063 err = mmc_wait_for_cmd(host, &cmd, 0);
1067 if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR))
1071 host->ios.signal_voltage = signal_voltage;
1073 if (host->ops->start_signal_voltage_switch) {
1074 mmc_host_clk_hold(host);
1075 err = host->ops->start_signal_voltage_switch(host, &host->ios);
1076 mmc_host_clk_release(host);
1083 * Select timing parameters for host.
1085 void mmc_set_timing(struct mmc_host *host, unsigned int timing)
1087 mmc_host_clk_hold(host);
1088 host->ios.timing = timing;
1090 mmc_host_clk_release(host);
1094 * Select appropriate driver type for host.
1096 void mmc_set_driver_type(struct mmc_host *host, unsigned int drv_type)
1098 mmc_host_clk_hold(host);
1099 host->ios.drv_type = drv_type;
1101 mmc_host_clk_release(host);
1104 static void mmc_poweroff_notify(struct mmc_host *host)
1106 struct mmc_card *card;
1107 unsigned int timeout;
1108 unsigned int notify_type = EXT_CSD_NO_POWER_NOTIFICATION;
1112 mmc_claim_host(host);
1115 * Send power notify command only if card
1116 * is mmc and notify state is powered ON
1118 if (card && mmc_card_mmc(card) &&
1119 (card->poweroff_notify_state == MMC_POWERED_ON)) {
1121 if (host->power_notify_type == MMC_HOST_PW_NOTIFY_SHORT) {
1122 notify_type = EXT_CSD_POWER_OFF_SHORT;
1123 timeout = card->ext_csd.generic_cmd6_time;
1124 card->poweroff_notify_state = MMC_POWEROFF_SHORT;
1126 notify_type = EXT_CSD_POWER_OFF_LONG;
1127 timeout = card->ext_csd.power_off_longtime;
1128 card->poweroff_notify_state = MMC_POWEROFF_LONG;
1131 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1132 EXT_CSD_POWER_OFF_NOTIFICATION,
1133 notify_type, timeout);
1135 if (err && err != -EBADMSG)
1136 pr_err("Device failed to respond within %d poweroff "
1137 "time. Forcefully powering down the device\n",
1140 /* Set the card state to no notification after the poweroff */
1141 card->poweroff_notify_state = MMC_NO_POWER_NOTIFICATION;
1143 mmc_release_host(host);
1147 * Apply power to the MMC stack. This is a two-stage process.
1148 * First, we enable power to the card without the clock running.
1149 * We then wait a bit for the power to stabilise. Finally,
1150 * enable the bus drivers and clock to the card.
1152 * We must _NOT_ enable the clock prior to power stablising.
1154 * If a host does all the power sequencing itself, ignore the
1155 * initial MMC_POWER_UP stage.
1157 static void mmc_power_up(struct mmc_host *host)
1161 mmc_host_clk_hold(host);
1163 /* If ocr is set, we use it */
1165 bit = ffs(host->ocr) - 1;
1167 bit = fls(host->ocr_avail) - 1;
1169 host->ios.vdd = bit;
1170 if (mmc_host_is_spi(host))
1171 host->ios.chip_select = MMC_CS_HIGH;
1173 host->ios.chip_select = MMC_CS_DONTCARE;
1174 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
1175 host->ios.power_mode = MMC_POWER_UP;
1176 host->ios.bus_width = MMC_BUS_WIDTH_1;
1177 host->ios.timing = MMC_TIMING_LEGACY;
1181 * This delay should be sufficient to allow the power supply
1182 * to reach the minimum voltage.
1186 host->ios.clock = host->f_init;
1188 host->ios.power_mode = MMC_POWER_ON;
1192 * This delay must be at least 74 clock sizes, or 1 ms, or the
1193 * time required to reach a stable voltage.
1197 mmc_host_clk_release(host);
1200 void mmc_power_off(struct mmc_host *host)
1203 mmc_host_clk_hold(host);
1205 host->ios.clock = 0;
1209 * For eMMC 4.5 device send AWAKE command before
1210 * POWER_OFF_NOTIFY command, because in sleep state
1211 * eMMC 4.5 devices respond to only RESET and AWAKE cmd
1213 if (host->card && mmc_card_is_sleep(host->card) &&
1214 host->bus_ops->resume) {
1215 err = host->bus_ops->resume(host);
1218 mmc_poweroff_notify(host);
1220 pr_warning("%s: error %d during resume "
1221 "(continue with poweroff sequence)\n",
1222 mmc_hostname(host), err);
1226 * Reset ocr mask to be the highest possible voltage supported for
1227 * this mmc host. This value will be used at next power up.
1229 host->ocr = 1 << (fls(host->ocr_avail) - 1);
1231 if (!mmc_host_is_spi(host)) {
1232 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
1233 host->ios.chip_select = MMC_CS_DONTCARE;
1235 host->ios.power_mode = MMC_POWER_OFF;
1236 host->ios.bus_width = MMC_BUS_WIDTH_1;
1237 host->ios.timing = MMC_TIMING_LEGACY;
1241 * Some configurations, such as the 802.11 SDIO card in the OLPC
1242 * XO-1.5, require a short delay after poweroff before the card
1243 * can be successfully turned on again.
1247 mmc_host_clk_release(host);
1251 * Cleanup when the last reference to the bus operator is dropped.
1253 static void __mmc_release_bus(struct mmc_host *host)
1256 BUG_ON(host->bus_refs);
1257 BUG_ON(!host->bus_dead);
1259 host->bus_ops = NULL;
1263 * Increase reference count of bus operator
1265 static inline void mmc_bus_get(struct mmc_host *host)
1267 unsigned long flags;
1269 spin_lock_irqsave(&host->lock, flags);
1271 spin_unlock_irqrestore(&host->lock, flags);
1275 * Decrease reference count of bus operator and free it if
1276 * it is the last reference.
1278 static inline void mmc_bus_put(struct mmc_host *host)
1280 unsigned long flags;
1282 spin_lock_irqsave(&host->lock, flags);
1284 if ((host->bus_refs == 0) && host->bus_ops)
1285 __mmc_release_bus(host);
1286 spin_unlock_irqrestore(&host->lock, flags);
1290 * Assign a mmc bus handler to a host. Only one bus handler may control a
1291 * host at any given time.
1293 void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops)
1295 unsigned long flags;
1300 WARN_ON(!host->claimed);
1302 spin_lock_irqsave(&host->lock, flags);
1304 BUG_ON(host->bus_ops);
1305 BUG_ON(host->bus_refs);
1307 host->bus_ops = ops;
1311 spin_unlock_irqrestore(&host->lock, flags);
1315 * Remove the current bus handler from a host.
1317 void mmc_detach_bus(struct mmc_host *host)
1319 unsigned long flags;
1323 WARN_ON(!host->claimed);
1324 WARN_ON(!host->bus_ops);
1326 spin_lock_irqsave(&host->lock, flags);
1330 spin_unlock_irqrestore(&host->lock, flags);
1336 * mmc_detect_change - process change of state on a MMC socket
1337 * @host: host which changed state.
1338 * @delay: optional delay to wait before detection (jiffies)
1340 * MMC drivers should call this when they detect a card has been
1341 * inserted or removed. The MMC layer will confirm that any
1342 * present card is still functional, and initialize any newly
1345 void mmc_detect_change(struct mmc_host *host, unsigned long delay)
1347 #ifdef CONFIG_MMC_DEBUG
1348 unsigned long flags;
1349 spin_lock_irqsave(&host->lock, flags);
1350 WARN_ON(host->removed);
1351 spin_unlock_irqrestore(&host->lock, flags);
1353 host->detect_change = 1;
1354 mmc_schedule_delayed_work(&host->detect, delay);
1357 EXPORT_SYMBOL(mmc_detect_change);
1359 void mmc_init_erase(struct mmc_card *card)
1363 if (is_power_of_2(card->erase_size))
1364 card->erase_shift = ffs(card->erase_size) - 1;
1366 card->erase_shift = 0;
1369 * It is possible to erase an arbitrarily large area of an SD or MMC
1370 * card. That is not desirable because it can take a long time
1371 * (minutes) potentially delaying more important I/O, and also the
1372 * timeout calculations become increasingly hugely over-estimated.
1373 * Consequently, 'pref_erase' is defined as a guide to limit erases
1374 * to that size and alignment.
1376 * For SD cards that define Allocation Unit size, limit erases to one
1377 * Allocation Unit at a time. For MMC cards that define High Capacity
1378 * Erase Size, whether it is switched on or not, limit to that size.
1379 * Otherwise just have a stab at a good value. For modern cards it
1380 * will end up being 4MiB. Note that if the value is too small, it
1381 * can end up taking longer to erase.
1383 if (mmc_card_sd(card) && card->ssr.au) {
1384 card->pref_erase = card->ssr.au;
1385 card->erase_shift = ffs(card->ssr.au) - 1;
1386 } else if (card->ext_csd.hc_erase_size) {
1387 card->pref_erase = card->ext_csd.hc_erase_size;
1389 sz = (card->csd.capacity << (card->csd.read_blkbits - 9)) >> 11;
1391 card->pref_erase = 512 * 1024 / 512;
1393 card->pref_erase = 1024 * 1024 / 512;
1395 card->pref_erase = 2 * 1024 * 1024 / 512;
1397 card->pref_erase = 4 * 1024 * 1024 / 512;
1398 if (card->pref_erase < card->erase_size)
1399 card->pref_erase = card->erase_size;
1401 sz = card->pref_erase % card->erase_size;
1403 card->pref_erase += card->erase_size - sz;
1408 static unsigned int mmc_mmc_erase_timeout(struct mmc_card *card,
1409 unsigned int arg, unsigned int qty)
1411 unsigned int erase_timeout;
1413 if (card->ext_csd.erase_group_def & 1) {
1414 /* High Capacity Erase Group Size uses HC timeouts */
1415 if (arg == MMC_TRIM_ARG)
1416 erase_timeout = card->ext_csd.trim_timeout;
1418 erase_timeout = card->ext_csd.hc_erase_timeout;
1420 /* CSD Erase Group Size uses write timeout */
1421 unsigned int mult = (10 << card->csd.r2w_factor);
1422 unsigned int timeout_clks = card->csd.tacc_clks * mult;
1423 unsigned int timeout_us;
1425 /* Avoid overflow: e.g. tacc_ns=80000000 mult=1280 */
1426 if (card->csd.tacc_ns < 1000000)
1427 timeout_us = (card->csd.tacc_ns * mult) / 1000;
1429 timeout_us = (card->csd.tacc_ns / 1000) * mult;
1432 * ios.clock is only a target. The real clock rate might be
1433 * less but not that much less, so fudge it by multiplying by 2.
1436 timeout_us += (timeout_clks * 1000) /
1437 (mmc_host_clk_rate(card->host) / 1000);
1439 erase_timeout = timeout_us / 1000;
1442 * Theoretically, the calculation could underflow so round up
1443 * to 1ms in that case.
1449 /* Multiplier for secure operations */
1450 if (arg & MMC_SECURE_ARGS) {
1451 if (arg == MMC_SECURE_ERASE_ARG)
1452 erase_timeout *= card->ext_csd.sec_erase_mult;
1454 erase_timeout *= card->ext_csd.sec_trim_mult;
1457 erase_timeout *= qty;
1460 * Ensure at least a 1 second timeout for SPI as per
1461 * 'mmc_set_data_timeout()'
1463 if (mmc_host_is_spi(card->host) && erase_timeout < 1000)
1464 erase_timeout = 1000;
1466 return erase_timeout;
1469 static unsigned int mmc_sd_erase_timeout(struct mmc_card *card,
1473 unsigned int erase_timeout;
1475 if (card->ssr.erase_timeout) {
1476 /* Erase timeout specified in SD Status Register (SSR) */
1477 erase_timeout = card->ssr.erase_timeout * qty +
1478 card->ssr.erase_offset;
1481 * Erase timeout not specified in SD Status Register (SSR) so
1482 * use 250ms per write block.
1484 erase_timeout = 250 * qty;
1487 /* Must not be less than 1 second */
1488 if (erase_timeout < 1000)
1489 erase_timeout = 1000;
1491 return erase_timeout;
1494 static unsigned int mmc_erase_timeout(struct mmc_card *card,
1498 if (mmc_card_sd(card))
1499 return mmc_sd_erase_timeout(card, arg, qty);
1501 return mmc_mmc_erase_timeout(card, arg, qty);
1504 static int mmc_do_erase(struct mmc_card *card, unsigned int from,
1505 unsigned int to, unsigned int arg)
1507 struct mmc_command cmd = {0};
1508 unsigned int qty = 0;
1512 * qty is used to calculate the erase timeout which depends on how many
1513 * erase groups (or allocation units in SD terminology) are affected.
1514 * We count erasing part of an erase group as one erase group.
1515 * For SD, the allocation units are always a power of 2. For MMC, the
1516 * erase group size is almost certainly also power of 2, but it does not
1517 * seem to insist on that in the JEDEC standard, so we fall back to
1518 * division in that case. SD may not specify an allocation unit size,
1519 * in which case the timeout is based on the number of write blocks.
1521 * Note that the timeout for secure trim 2 will only be correct if the
1522 * number of erase groups specified is the same as the total of all
1523 * preceding secure trim 1 commands. Since the power may have been
1524 * lost since the secure trim 1 commands occurred, it is generally
1525 * impossible to calculate the secure trim 2 timeout correctly.
1527 if (card->erase_shift)
1528 qty += ((to >> card->erase_shift) -
1529 (from >> card->erase_shift)) + 1;
1530 else if (mmc_card_sd(card))
1531 qty += to - from + 1;
1533 qty += ((to / card->erase_size) -
1534 (from / card->erase_size)) + 1;
1536 if (!mmc_card_blockaddr(card)) {
1541 if (mmc_card_sd(card))
1542 cmd.opcode = SD_ERASE_WR_BLK_START;
1544 cmd.opcode = MMC_ERASE_GROUP_START;
1546 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
1547 err = mmc_wait_for_cmd(card->host, &cmd, 0);
1549 pr_err("mmc_erase: group start error %d, "
1550 "status %#x\n", err, cmd.resp[0]);
1555 memset(&cmd, 0, sizeof(struct mmc_command));
1556 if (mmc_card_sd(card))
1557 cmd.opcode = SD_ERASE_WR_BLK_END;
1559 cmd.opcode = MMC_ERASE_GROUP_END;
1561 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
1562 err = mmc_wait_for_cmd(card->host, &cmd, 0);
1564 pr_err("mmc_erase: group end error %d, status %#x\n",
1570 memset(&cmd, 0, sizeof(struct mmc_command));
1571 cmd.opcode = MMC_ERASE;
1573 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1574 cmd.cmd_timeout_ms = mmc_erase_timeout(card, arg, qty);
1575 err = mmc_wait_for_cmd(card->host, &cmd, 0);
1577 pr_err("mmc_erase: erase error %d, status %#x\n",
1583 if (mmc_host_is_spi(card->host))
1587 memset(&cmd, 0, sizeof(struct mmc_command));
1588 cmd.opcode = MMC_SEND_STATUS;
1589 cmd.arg = card->rca << 16;
1590 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
1591 /* Do not retry else we can't see errors */
1592 err = mmc_wait_for_cmd(card->host, &cmd, 0);
1593 if (err || (cmd.resp[0] & 0xFDF92000)) {
1594 pr_err("error %d requesting status %#x\n",
1599 } while (!(cmd.resp[0] & R1_READY_FOR_DATA) ||
1600 R1_CURRENT_STATE(cmd.resp[0]) == R1_STATE_PRG);
1606 * mmc_erase - erase sectors.
1607 * @card: card to erase
1608 * @from: first sector to erase
1609 * @nr: number of sectors to erase
1610 * @arg: erase command argument (SD supports only %MMC_ERASE_ARG)
1612 * Caller must claim host before calling this function.
1614 int mmc_erase(struct mmc_card *card, unsigned int from, unsigned int nr,
1617 unsigned int rem, to = from + nr;
1619 if (!(card->host->caps & MMC_CAP_ERASE) ||
1620 !(card->csd.cmdclass & CCC_ERASE))
1623 if (!card->erase_size)
1626 if (mmc_card_sd(card) && arg != MMC_ERASE_ARG)
1629 if ((arg & MMC_SECURE_ARGS) &&
1630 !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN))
1633 if ((arg & MMC_TRIM_ARGS) &&
1634 !(card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN))
1637 if (arg == MMC_SECURE_ERASE_ARG) {
1638 if (from % card->erase_size || nr % card->erase_size)
1642 if (arg == MMC_ERASE_ARG) {
1643 rem = from % card->erase_size;
1645 rem = card->erase_size - rem;
1652 rem = nr % card->erase_size;
1665 /* 'from' and 'to' are inclusive */
1668 return mmc_do_erase(card, from, to, arg);
1670 EXPORT_SYMBOL(mmc_erase);
1672 int mmc_can_erase(struct mmc_card *card)
1674 if ((card->host->caps & MMC_CAP_ERASE) &&
1675 (card->csd.cmdclass & CCC_ERASE) && card->erase_size)
1679 EXPORT_SYMBOL(mmc_can_erase);
1681 int mmc_can_trim(struct mmc_card *card)
1683 if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_GB_CL_EN)
1685 if (mmc_can_discard(card))
1689 EXPORT_SYMBOL(mmc_can_trim);
1691 int mmc_can_discard(struct mmc_card *card)
1694 * As there's no way to detect the discard support bit at v4.5
1695 * use the s/w feature support filed.
1697 if (card->ext_csd.feature_support & MMC_DISCARD_FEATURE)
1701 EXPORT_SYMBOL(mmc_can_discard);
1703 int mmc_can_sanitize(struct mmc_card *card)
1705 if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_SANITIZE)
1709 EXPORT_SYMBOL(mmc_can_sanitize);
1711 int mmc_can_secure_erase_trim(struct mmc_card *card)
1713 if (card->ext_csd.sec_feature_support & EXT_CSD_SEC_ER_EN)
1717 EXPORT_SYMBOL(mmc_can_secure_erase_trim);
1719 int mmc_erase_group_aligned(struct mmc_card *card, unsigned int from,
1722 if (!card->erase_size)
1724 if (from % card->erase_size || nr % card->erase_size)
1728 EXPORT_SYMBOL(mmc_erase_group_aligned);
1730 static unsigned int mmc_do_calc_max_discard(struct mmc_card *card,
1733 struct mmc_host *host = card->host;
1734 unsigned int max_discard, x, y, qty = 0, max_qty, timeout;
1735 unsigned int last_timeout = 0;
1737 if (card->erase_shift)
1738 max_qty = UINT_MAX >> card->erase_shift;
1739 else if (mmc_card_sd(card))
1742 max_qty = UINT_MAX / card->erase_size;
1744 /* Find the largest qty with an OK timeout */
1747 for (x = 1; x && x <= max_qty && max_qty - x >= qty; x <<= 1) {
1748 timeout = mmc_erase_timeout(card, arg, qty + x);
1749 if (timeout > host->max_discard_to)
1751 if (timeout < last_timeout)
1753 last_timeout = timeout;
1765 /* Convert qty to sectors */
1766 if (card->erase_shift)
1767 max_discard = --qty << card->erase_shift;
1768 else if (mmc_card_sd(card))
1771 max_discard = --qty * card->erase_size;
1776 unsigned int mmc_calc_max_discard(struct mmc_card *card)
1778 struct mmc_host *host = card->host;
1779 unsigned int max_discard, max_trim;
1781 if (!host->max_discard_to)
1785 * Without erase_group_def set, MMC erase timeout depends on clock
1786 * frequence which can change. In that case, the best choice is
1787 * just the preferred erase size.
1789 if (mmc_card_mmc(card) && !(card->ext_csd.erase_group_def & 1))
1790 return card->pref_erase;
1792 max_discard = mmc_do_calc_max_discard(card, MMC_ERASE_ARG);
1793 if (mmc_can_trim(card)) {
1794 max_trim = mmc_do_calc_max_discard(card, MMC_TRIM_ARG);
1795 if (max_trim < max_discard)
1796 max_discard = max_trim;
1797 } else if (max_discard < card->erase_size) {
1800 pr_debug("%s: calculated max. discard sectors %u for timeout %u ms\n",
1801 mmc_hostname(host), max_discard, host->max_discard_to);
1804 EXPORT_SYMBOL(mmc_calc_max_discard);
1806 int mmc_set_blocklen(struct mmc_card *card, unsigned int blocklen)
1808 struct mmc_command cmd = {0};
1810 if (mmc_card_blockaddr(card) || mmc_card_ddr_mode(card))
1813 cmd.opcode = MMC_SET_BLOCKLEN;
1815 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
1816 return mmc_wait_for_cmd(card->host, &cmd, 5);
1818 EXPORT_SYMBOL(mmc_set_blocklen);
1820 static void mmc_hw_reset_for_init(struct mmc_host *host)
1822 if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
1824 mmc_host_clk_hold(host);
1825 host->ops->hw_reset(host);
1826 mmc_host_clk_release(host);
1829 int mmc_can_reset(struct mmc_card *card)
1833 if (!mmc_card_mmc(card))
1835 rst_n_function = card->ext_csd.rst_n_function;
1836 if ((rst_n_function & EXT_CSD_RST_N_EN_MASK) != EXT_CSD_RST_N_ENABLED)
1840 EXPORT_SYMBOL(mmc_can_reset);
1842 static int mmc_do_hw_reset(struct mmc_host *host, int check)
1844 struct mmc_card *card = host->card;
1846 if (!host->bus_ops->power_restore)
1849 if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
1855 if (!mmc_can_reset(card))
1858 mmc_host_clk_hold(host);
1859 mmc_set_clock(host, host->f_init);
1861 host->ops->hw_reset(host);
1863 /* If the reset has happened, then a status command will fail */
1865 struct mmc_command cmd = {0};
1868 cmd.opcode = MMC_SEND_STATUS;
1869 if (!mmc_host_is_spi(card->host))
1870 cmd.arg = card->rca << 16;
1871 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
1872 err = mmc_wait_for_cmd(card->host, &cmd, 0);
1874 mmc_host_clk_release(host);
1879 host->card->state &= ~(MMC_STATE_HIGHSPEED | MMC_STATE_HIGHSPEED_DDR);
1880 if (mmc_host_is_spi(host)) {
1881 host->ios.chip_select = MMC_CS_HIGH;
1882 host->ios.bus_mode = MMC_BUSMODE_PUSHPULL;
1884 host->ios.chip_select = MMC_CS_DONTCARE;
1885 host->ios.bus_mode = MMC_BUSMODE_OPENDRAIN;
1887 host->ios.bus_width = MMC_BUS_WIDTH_1;
1888 host->ios.timing = MMC_TIMING_LEGACY;
1891 mmc_host_clk_release(host);
1893 return host->bus_ops->power_restore(host);
1896 int mmc_hw_reset(struct mmc_host *host)
1898 return mmc_do_hw_reset(host, 0);
1900 EXPORT_SYMBOL(mmc_hw_reset);
1902 int mmc_hw_reset_check(struct mmc_host *host)
1904 return mmc_do_hw_reset(host, 1);
1906 EXPORT_SYMBOL(mmc_hw_reset_check);
1908 static int mmc_rescan_try_freq(struct mmc_host *host, unsigned freq)
1910 host->f_init = freq;
1912 #ifdef CONFIG_MMC_DEBUG
1913 pr_info("%s: %s: trying to init card at %u Hz\n",
1914 mmc_hostname(host), __func__, host->f_init);
1919 * Some eMMCs (with VCCQ always on) may not be reset after power up, so
1920 * do a hardware reset if possible.
1922 mmc_hw_reset_for_init(host);
1924 /* Initialization should be done at 3.3 V I/O voltage. */
1925 mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_330, 0);
1928 * sdio_reset sends CMD52 to reset card. Since we do not know
1929 * if the card is being re-initialized, just send it. CMD52
1930 * should be ignored by SD/eMMC cards.
1935 mmc_send_if_cond(host, host->ocr_avail);
1937 /* Order's important: probe SDIO, then SD, then MMC */
1938 if (!mmc_attach_sdio(host))
1940 if (!mmc_attach_sd(host))
1942 if (!mmc_attach_mmc(host))
1945 mmc_power_off(host);
1949 int _mmc_detect_card_removed(struct mmc_host *host)
1953 if ((host->caps & MMC_CAP_NONREMOVABLE) || !host->bus_ops->alive)
1956 if (!host->card || mmc_card_removed(host->card))
1959 ret = host->bus_ops->alive(host);
1961 mmc_card_set_removed(host->card);
1962 pr_debug("%s: card remove detected\n", mmc_hostname(host));
1968 int mmc_detect_card_removed(struct mmc_host *host)
1970 struct mmc_card *card = host->card;
1973 WARN_ON(!host->claimed);
1978 ret = mmc_card_removed(card);
1980 * The card will be considered unchanged unless we have been asked to
1981 * detect a change or host requires polling to provide card detection.
1983 if (!host->detect_change && !(host->caps & MMC_CAP_NEEDS_POLL) &&
1984 !(host->caps2 & MMC_CAP2_DETECT_ON_ERR))
1987 host->detect_change = 0;
1989 ret = _mmc_detect_card_removed(host);
1990 if (ret && (host->caps2 & MMC_CAP2_DETECT_ON_ERR)) {
1992 * Schedule a detect work as soon as possible to let a
1993 * rescan handle the card removal.
1995 cancel_delayed_work(&host->detect);
1996 mmc_detect_change(host, 0);
2002 EXPORT_SYMBOL(mmc_detect_card_removed);
2004 void mmc_rescan(struct work_struct *work)
2006 static const unsigned freqs[] = { 400000, 300000, 200000, 100000 };
2007 struct mmc_host *host =
2008 container_of(work, struct mmc_host, detect.work);
2011 if (host->rescan_disable)
2017 * if there is a _removable_ card registered, check whether it is
2020 if (host->bus_ops && host->bus_ops->detect && !host->bus_dead
2021 && !(host->caps & MMC_CAP_NONREMOVABLE))
2022 host->bus_ops->detect(host);
2024 host->detect_change = 0;
2027 * Let mmc_bus_put() free the bus/bus_ops if we've found that
2028 * the card is no longer present.
2033 /* if there still is a card present, stop here */
2034 if (host->bus_ops != NULL) {
2040 * Only we can add a new handler, so it's safe to
2041 * release the lock here.
2045 if (host->ops->get_cd && host->ops->get_cd(host) == 0)
2048 mmc_claim_host(host);
2049 for (i = 0; i < ARRAY_SIZE(freqs); i++) {
2050 if (!mmc_rescan_try_freq(host, max(freqs[i], host->f_min)))
2052 if (freqs[i] <= host->f_min)
2055 mmc_release_host(host);
2058 if (host->caps & MMC_CAP_NEEDS_POLL)
2059 mmc_schedule_delayed_work(&host->detect, HZ);
2062 void mmc_start_host(struct mmc_host *host)
2064 mmc_power_off(host);
2065 mmc_detect_change(host, 0);
2068 void mmc_stop_host(struct mmc_host *host)
2070 #ifdef CONFIG_MMC_DEBUG
2071 unsigned long flags;
2072 spin_lock_irqsave(&host->lock, flags);
2074 spin_unlock_irqrestore(&host->lock, flags);
2077 cancel_delayed_work_sync(&host->detect);
2078 mmc_flush_scheduled_work();
2080 /* clear pm flags now and let card drivers set them as needed */
2084 if (host->bus_ops && !host->bus_dead) {
2085 /* Calling bus_ops->remove() with a claimed host can deadlock */
2086 if (host->bus_ops->remove)
2087 host->bus_ops->remove(host);
2089 mmc_claim_host(host);
2090 mmc_detach_bus(host);
2091 mmc_power_off(host);
2092 mmc_release_host(host);
2100 mmc_power_off(host);
2103 int mmc_power_save_host(struct mmc_host *host)
2107 #ifdef CONFIG_MMC_DEBUG
2108 pr_info("%s: %s: powering down\n", mmc_hostname(host), __func__);
2113 if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) {
2118 if (host->bus_ops->power_save)
2119 ret = host->bus_ops->power_save(host);
2123 mmc_power_off(host);
2127 EXPORT_SYMBOL(mmc_power_save_host);
2129 int mmc_power_restore_host(struct mmc_host *host)
2133 #ifdef CONFIG_MMC_DEBUG
2134 pr_info("%s: %s: powering up\n", mmc_hostname(host), __func__);
2139 if (!host->bus_ops || host->bus_dead || !host->bus_ops->power_restore) {
2145 ret = host->bus_ops->power_restore(host);
2151 EXPORT_SYMBOL(mmc_power_restore_host);
2153 int mmc_card_awake(struct mmc_host *host)
2157 if (host->caps2 & MMC_CAP2_NO_SLEEP_CMD)
2162 if (host->bus_ops && !host->bus_dead && host->bus_ops->awake)
2163 err = host->bus_ops->awake(host);
2169 EXPORT_SYMBOL(mmc_card_awake);
2171 int mmc_card_sleep(struct mmc_host *host)
2175 if (host->caps2 & MMC_CAP2_NO_SLEEP_CMD)
2180 if (host->bus_ops && !host->bus_dead && host->bus_ops->sleep)
2181 err = host->bus_ops->sleep(host);
2187 EXPORT_SYMBOL(mmc_card_sleep);
2189 int mmc_card_can_sleep(struct mmc_host *host)
2191 struct mmc_card *card = host->card;
2193 if (card && mmc_card_mmc(card) && card->ext_csd.rev >= 3)
2197 EXPORT_SYMBOL(mmc_card_can_sleep);
2200 * Flush the cache to the non-volatile storage.
2202 int mmc_flush_cache(struct mmc_card *card)
2204 struct mmc_host *host = card->host;
2207 if (!(host->caps2 & MMC_CAP2_CACHE_CTRL))
2210 if (mmc_card_mmc(card) &&
2211 (card->ext_csd.cache_size > 0) &&
2212 (card->ext_csd.cache_ctrl & 1)) {
2213 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
2214 EXT_CSD_FLUSH_CACHE, 1, 0);
2216 pr_err("%s: cache flush error %d\n",
2217 mmc_hostname(card->host), err);
2222 EXPORT_SYMBOL(mmc_flush_cache);
2225 * Turn the cache ON/OFF.
2226 * Turning the cache OFF shall trigger flushing of the data
2227 * to the non-volatile storage.
2229 int mmc_cache_ctrl(struct mmc_host *host, u8 enable)
2231 struct mmc_card *card = host->card;
2232 unsigned int timeout;
2235 if (!(host->caps2 & MMC_CAP2_CACHE_CTRL) ||
2236 mmc_card_is_removable(host))
2239 if (card && mmc_card_mmc(card) &&
2240 (card->ext_csd.cache_size > 0)) {
2243 if (card->ext_csd.cache_ctrl ^ enable) {
2244 timeout = enable ? card->ext_csd.generic_cmd6_time : 0;
2245 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
2246 EXT_CSD_CACHE_CTRL, enable, timeout);
2248 pr_err("%s: cache %s error %d\n",
2249 mmc_hostname(card->host),
2250 enable ? "on" : "off",
2253 card->ext_csd.cache_ctrl = enable;
2259 EXPORT_SYMBOL(mmc_cache_ctrl);
2264 * mmc_suspend_host - suspend a host
2267 int mmc_suspend_host(struct mmc_host *host)
2271 cancel_delayed_work(&host->detect);
2272 mmc_flush_scheduled_work();
2273 if (mmc_try_claim_host(host)) {
2274 err = mmc_cache_ctrl(host, 0);
2275 mmc_release_host(host);
2284 if (host->bus_ops && !host->bus_dead) {
2287 * A long response time is not acceptable for device drivers
2288 * when doing suspend. Prevent mmc_claim_host in the suspend
2289 * sequence, to potentially wait "forever" by trying to
2290 * pre-claim the host.
2292 if (mmc_try_claim_host(host)) {
2293 if (host->bus_ops->suspend) {
2294 err = host->bus_ops->suspend(host);
2296 mmc_release_host(host);
2298 if (err == -ENOSYS || !host->bus_ops->resume) {
2300 * We simply "remove" the card in this case.
2301 * It will be redetected on resume. (Calling
2302 * bus_ops->remove() with a claimed host can
2305 if (host->bus_ops->remove)
2306 host->bus_ops->remove(host);
2307 mmc_claim_host(host);
2308 mmc_detach_bus(host);
2309 mmc_power_off(host);
2310 mmc_release_host(host);
2320 if (!err && !mmc_card_keep_power(host))
2321 mmc_power_off(host);
2327 EXPORT_SYMBOL(mmc_suspend_host);
2330 * mmc_resume_host - resume a previously suspended host
2333 int mmc_resume_host(struct mmc_host *host)
2338 if (host->bus_ops && !host->bus_dead) {
2339 if (!mmc_card_keep_power(host)) {
2341 mmc_select_voltage(host, host->ocr);
2343 * Tell runtime PM core we just powered up the card,
2344 * since it still believes the card is powered off.
2345 * Note that currently runtime PM is only enabled
2346 * for SDIO cards that are MMC_CAP_POWER_OFF_CARD
2348 if (mmc_card_sdio(host->card) &&
2349 (host->caps & MMC_CAP_POWER_OFF_CARD)) {
2350 pm_runtime_disable(&host->card->dev);
2351 pm_runtime_set_active(&host->card->dev);
2352 pm_runtime_enable(&host->card->dev);
2355 BUG_ON(!host->bus_ops->resume);
2356 err = host->bus_ops->resume(host);
2358 pr_warning("%s: error %d during resume "
2359 "(card was removed?)\n",
2360 mmc_hostname(host), err);
2364 host->pm_flags &= ~MMC_PM_KEEP_POWER;
2369 EXPORT_SYMBOL(mmc_resume_host);
2371 /* Do the card removal on suspend if card is assumed removeable
2372 * Do that in pm notifier while userspace isn't yet frozen, so we will be able
2375 int mmc_pm_notify(struct notifier_block *notify_block,
2376 unsigned long mode, void *unused)
2378 struct mmc_host *host = container_of(
2379 notify_block, struct mmc_host, pm_notify);
2380 unsigned long flags;
2384 case PM_HIBERNATION_PREPARE:
2385 case PM_SUSPEND_PREPARE:
2387 spin_lock_irqsave(&host->lock, flags);
2388 host->rescan_disable = 1;
2389 host->power_notify_type = MMC_HOST_PW_NOTIFY_SHORT;
2390 spin_unlock_irqrestore(&host->lock, flags);
2391 cancel_delayed_work_sync(&host->detect);
2393 if (!host->bus_ops || host->bus_ops->suspend)
2396 /* Calling bus_ops->remove() with a claimed host can deadlock */
2397 if (host->bus_ops->remove)
2398 host->bus_ops->remove(host);
2400 mmc_claim_host(host);
2401 mmc_detach_bus(host);
2402 mmc_power_off(host);
2403 mmc_release_host(host);
2407 case PM_POST_SUSPEND:
2408 case PM_POST_HIBERNATION:
2409 case PM_POST_RESTORE:
2411 spin_lock_irqsave(&host->lock, flags);
2412 host->rescan_disable = 0;
2413 host->power_notify_type = MMC_HOST_PW_NOTIFY_LONG;
2414 spin_unlock_irqrestore(&host->lock, flags);
2415 mmc_detect_change(host, 0);
2423 static int __init mmc_init(void)
2427 workqueue = alloc_ordered_workqueue("kmmcd", 0);
2431 ret = mmc_register_bus();
2433 goto destroy_workqueue;
2435 ret = mmc_register_host_class();
2437 goto unregister_bus;
2439 ret = sdio_register_bus();
2441 goto unregister_host_class;
2445 unregister_host_class:
2446 mmc_unregister_host_class();
2448 mmc_unregister_bus();
2450 destroy_workqueue(workqueue);
2455 static void __exit mmc_exit(void)
2457 sdio_unregister_bus();
2458 mmc_unregister_host_class();
2459 mmc_unregister_bus();
2460 destroy_workqueue(workqueue);
2463 subsys_initcall(mmc_init);
2464 module_exit(mmc_exit);
2466 MODULE_LICENSE("GPL");