1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * linux/drivers/mmc/core/mmc_ops.h
5 * Copyright 2006-2007 Pierre Ossman
8 #include <linux/slab.h>
9 #include <linux/export.h>
10 #include <linux/types.h>
11 #include <linux/scatterlist.h>
13 #include <linux/mmc/host.h>
14 #include <linux/mmc/card.h>
15 #include <linux/mmc/mmc.h>
22 #define MMC_OPS_TIMEOUT_MS (10 * 60 * 1000) /* 10min*/
23 #define MMC_BKOPS_TIMEOUT_MS (120 * 1000) /* 120s */
24 #define MMC_CACHE_FLUSH_TIMEOUT_MS (30 * 1000) /* 30s */
26 static const u8 tuning_blk_pattern_4bit[] = {
27 0xff, 0x0f, 0xff, 0x00, 0xff, 0xcc, 0xc3, 0xcc,
28 0xc3, 0x3c, 0xcc, 0xff, 0xfe, 0xff, 0xfe, 0xef,
29 0xff, 0xdf, 0xff, 0xdd, 0xff, 0xfb, 0xff, 0xfb,
30 0xbf, 0xff, 0x7f, 0xff, 0x77, 0xf7, 0xbd, 0xef,
31 0xff, 0xf0, 0xff, 0xf0, 0x0f, 0xfc, 0xcc, 0x3c,
32 0xcc, 0x33, 0xcc, 0xcf, 0xff, 0xef, 0xff, 0xee,
33 0xff, 0xfd, 0xff, 0xfd, 0xdf, 0xff, 0xbf, 0xff,
34 0xbb, 0xff, 0xf7, 0xff, 0xf7, 0x7f, 0x7b, 0xde,
37 static const u8 tuning_blk_pattern_8bit[] = {
38 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00,
39 0xff, 0xff, 0xcc, 0xcc, 0xcc, 0x33, 0xcc, 0xcc,
40 0xcc, 0x33, 0x33, 0xcc, 0xcc, 0xcc, 0xff, 0xff,
41 0xff, 0xee, 0xff, 0xff, 0xff, 0xee, 0xee, 0xff,
42 0xff, 0xff, 0xdd, 0xff, 0xff, 0xff, 0xdd, 0xdd,
43 0xff, 0xff, 0xff, 0xbb, 0xff, 0xff, 0xff, 0xbb,
44 0xbb, 0xff, 0xff, 0xff, 0x77, 0xff, 0xff, 0xff,
45 0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee, 0xff,
46 0xff, 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0x00,
47 0x00, 0xff, 0xff, 0xcc, 0xcc, 0xcc, 0x33, 0xcc,
48 0xcc, 0xcc, 0x33, 0x33, 0xcc, 0xcc, 0xcc, 0xff,
49 0xff, 0xff, 0xee, 0xff, 0xff, 0xff, 0xee, 0xee,
50 0xff, 0xff, 0xff, 0xdd, 0xff, 0xff, 0xff, 0xdd,
51 0xdd, 0xff, 0xff, 0xff, 0xbb, 0xff, 0xff, 0xff,
52 0xbb, 0xbb, 0xff, 0xff, 0xff, 0x77, 0xff, 0xff,
53 0xff, 0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee,
56 int __mmc_send_status(struct mmc_card *card, u32 *status, unsigned int retries)
59 struct mmc_command cmd = {};
61 cmd.opcode = MMC_SEND_STATUS;
62 if (!mmc_host_is_spi(card->host))
63 cmd.arg = card->rca << 16;
64 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
66 err = mmc_wait_for_cmd(card->host, &cmd, retries);
70 /* NOTE: callers are required to understand the difference
71 * between "native" and SPI format status words!
74 *status = cmd.resp[0];
78 EXPORT_SYMBOL_GPL(__mmc_send_status);
80 int mmc_send_status(struct mmc_card *card, u32 *status)
82 return __mmc_send_status(card, status, MMC_CMD_RETRIES);
84 EXPORT_SYMBOL_GPL(mmc_send_status);
86 static int _mmc_select_card(struct mmc_host *host, struct mmc_card *card)
88 struct mmc_command cmd = {};
90 cmd.opcode = MMC_SELECT_CARD;
93 cmd.arg = card->rca << 16;
94 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
97 cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
100 return mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
103 int mmc_select_card(struct mmc_card *card)
106 return _mmc_select_card(card->host, card);
109 int mmc_deselect_cards(struct mmc_host *host)
111 return _mmc_select_card(host, NULL);
115 * Write the value specified in the device tree or board code into the optional
116 * 16 bit Driver Stage Register. This can be used to tune raise/fall times and
117 * drive strength of the DAT and CMD outputs. The actual meaning of a given
118 * value is hardware dependant.
119 * The presence of the DSR register can be determined from the CSD register,
122 int mmc_set_dsr(struct mmc_host *host)
124 struct mmc_command cmd = {};
126 cmd.opcode = MMC_SET_DSR;
128 cmd.arg = (host->dsr << 16) | 0xffff;
129 cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
131 return mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
134 int mmc_go_idle(struct mmc_host *host)
137 struct mmc_command cmd = {};
140 * Non-SPI hosts need to prevent chipselect going active during
141 * GO_IDLE; that would put chips into SPI mode. Remind them of
142 * that in case of hardware that won't pull up DAT3/nCS otherwise.
144 * SPI hosts ignore ios.chip_select; it's managed according to
145 * rules that must accommodate non-MMC slaves which this layer
146 * won't even know about.
148 if (!mmc_host_is_spi(host)) {
149 mmc_set_chip_select(host, MMC_CS_HIGH);
153 cmd.opcode = MMC_GO_IDLE_STATE;
155 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_NONE | MMC_CMD_BC;
157 err = mmc_wait_for_cmd(host, &cmd, 0);
161 if (!mmc_host_is_spi(host)) {
162 mmc_set_chip_select(host, MMC_CS_DONTCARE);
166 host->use_spi_crc = 0;
171 int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
173 struct mmc_command cmd = {};
176 cmd.opcode = MMC_SEND_OP_COND;
177 cmd.arg = mmc_host_is_spi(host) ? 0 : ocr;
178 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
180 for (i = 100; i; i--) {
181 err = mmc_wait_for_cmd(host, &cmd, 0);
185 /* wait until reset completes */
186 if (mmc_host_is_spi(host)) {
187 if (!(cmd.resp[0] & R1_SPI_IDLE))
190 if (cmd.resp[0] & MMC_CARD_BUSY)
199 * According to eMMC specification v5.1 section 6.4.3, we
200 * should issue CMD1 repeatedly in the idle state until
201 * the eMMC is ready. Otherwise some eMMC devices seem to enter
202 * the inactive mode after mmc_init_card() issued CMD0 when
203 * the eMMC device is busy.
205 if (!ocr && !mmc_host_is_spi(host))
206 cmd.arg = cmd.resp[0] | BIT(30);
209 if (rocr && !mmc_host_is_spi(host))
215 int mmc_set_relative_addr(struct mmc_card *card)
217 struct mmc_command cmd = {};
219 cmd.opcode = MMC_SET_RELATIVE_ADDR;
220 cmd.arg = card->rca << 16;
221 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
223 return mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
227 mmc_send_cxd_native(struct mmc_host *host, u32 arg, u32 *cxd, int opcode)
230 struct mmc_command cmd = {};
234 cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;
236 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
240 memcpy(cxd, cmd.resp, sizeof(u32) * 4);
246 * NOTE: void *buf, caller for the buf is required to use DMA-capable
247 * buffer or on-stack buffer (with some overhead in callee).
250 mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
251 u32 opcode, void *buf, unsigned len)
253 struct mmc_request mrq = {};
254 struct mmc_command cmd = {};
255 struct mmc_data data = {};
256 struct scatterlist sg;
264 /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
265 * rely on callers to never use this with "native" calls for reading
266 * CSD or CID. Native versions of those commands use the R2 type,
267 * not R1 plus a data block.
269 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
273 data.flags = MMC_DATA_READ;
277 sg_init_one(&sg, buf, len);
279 if (opcode == MMC_SEND_CSD || opcode == MMC_SEND_CID) {
281 * The spec states that CSR and CID accesses have a timeout
282 * of 64 clock cycles.
285 data.timeout_clks = 64;
287 mmc_set_data_timeout(&data, card);
289 mmc_wait_for_req(host, &mrq);
299 static int mmc_spi_send_csd(struct mmc_card *card, u32 *csd)
304 csd_tmp = kzalloc(16, GFP_KERNEL);
308 ret = mmc_send_cxd_data(card, card->host, MMC_SEND_CSD, csd_tmp, 16);
312 for (i = 0; i < 4; i++)
313 csd[i] = be32_to_cpu(csd_tmp[i]);
320 int mmc_send_csd(struct mmc_card *card, u32 *csd)
322 if (mmc_host_is_spi(card->host))
323 return mmc_spi_send_csd(card, csd);
325 return mmc_send_cxd_native(card->host, card->rca << 16, csd,
329 static int mmc_spi_send_cid(struct mmc_host *host, u32 *cid)
334 cid_tmp = kzalloc(16, GFP_KERNEL);
338 ret = mmc_send_cxd_data(NULL, host, MMC_SEND_CID, cid_tmp, 16);
342 for (i = 0; i < 4; i++)
343 cid[i] = be32_to_cpu(cid_tmp[i]);
350 int mmc_send_cid(struct mmc_host *host, u32 *cid)
352 if (mmc_host_is_spi(host))
353 return mmc_spi_send_cid(host, cid);
355 return mmc_send_cxd_native(host, 0, cid, MMC_ALL_SEND_CID);
358 int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd)
363 if (!card || !new_ext_csd)
366 if (!mmc_can_ext_csd(card))
370 * As the ext_csd is so large and mostly unused, we don't store the
371 * raw block in mmc_card.
373 ext_csd = kzalloc(512, GFP_KERNEL);
377 err = mmc_send_cxd_data(card, card->host, MMC_SEND_EXT_CSD, ext_csd,
382 *new_ext_csd = ext_csd;
386 EXPORT_SYMBOL_GPL(mmc_get_ext_csd);
388 int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp)
390 struct mmc_command cmd = {};
393 cmd.opcode = MMC_SPI_READ_OCR;
394 cmd.arg = highcap ? (1 << 30) : 0;
395 cmd.flags = MMC_RSP_SPI_R3;
397 err = mmc_wait_for_cmd(host, &cmd, 0);
403 int mmc_spi_set_crc(struct mmc_host *host, int use_crc)
405 struct mmc_command cmd = {};
408 cmd.opcode = MMC_SPI_CRC_ON_OFF;
409 cmd.flags = MMC_RSP_SPI_R1;
412 err = mmc_wait_for_cmd(host, &cmd, 0);
414 host->use_spi_crc = use_crc;
418 static int mmc_switch_status_error(struct mmc_host *host, u32 status)
420 if (mmc_host_is_spi(host)) {
421 if (status & R1_SPI_ILLEGAL_COMMAND)
424 if (R1_STATUS(status))
425 pr_warn("%s: unexpected status %#x after switch\n",
426 mmc_hostname(host), status);
427 if (status & R1_SWITCH_ERROR)
433 /* Caller must hold re-tuning */
434 int __mmc_switch_status(struct mmc_card *card, bool crc_err_fatal)
439 err = mmc_send_status(card, &status);
440 if (!crc_err_fatal && err == -EILSEQ)
445 return mmc_switch_status_error(card->host, status);
448 int mmc_switch_status(struct mmc_card *card)
450 return __mmc_switch_status(card, true);
453 static int mmc_poll_for_busy(struct mmc_card *card, unsigned int timeout_ms,
454 bool send_status, bool retry_crc_err)
456 struct mmc_host *host = card->host;
458 unsigned long timeout;
460 bool expired = false;
464 * In cases when not allowed to poll by using CMD13 or because we aren't
465 * capable of polling by using ->card_busy(), then rely on waiting the
466 * stated timeout to be sufficient.
468 if (!send_status && !host->ops->card_busy) {
469 mmc_delay(timeout_ms);
473 timeout = jiffies + msecs_to_jiffies(timeout_ms) + 1;
476 * Due to the possibility of being preempted while polling,
477 * check the expiration time first.
479 expired = time_after(jiffies, timeout);
481 if (host->ops->card_busy) {
482 busy = host->ops->card_busy(host);
484 err = mmc_send_status(card, &status);
485 if (retry_crc_err && err == -EILSEQ) {
490 err = mmc_switch_status_error(host, status);
493 busy = R1_CURRENT_STATE(status) == R1_STATE_PRG;
497 /* Timeout if the device still remains busy. */
498 if (expired && busy) {
499 pr_err("%s: Card stuck being busy! %s\n",
500 mmc_hostname(host), __func__);
509 * __mmc_switch - modify EXT_CSD register
510 * @card: the MMC card associated with the data transfer
511 * @set: cmd set values
512 * @index: EXT_CSD register index
513 * @value: value to program into EXT_CSD register
514 * @timeout_ms: timeout (ms) for operation performed by register write,
515 * timeout of zero implies maximum possible timeout
516 * @timing: new timing to change to
517 * @use_busy_signal: use the busy signal as response type
518 * @send_status: send status cmd to poll for busy
519 * @retry_crc_err: retry when CRC errors when polling with CMD13 for busy
521 * Modifies the EXT_CSD register for selected card.
523 int __mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
524 unsigned int timeout_ms, unsigned char timing,
525 bool use_busy_signal, bool send_status, bool retry_crc_err)
527 struct mmc_host *host = card->host;
529 struct mmc_command cmd = {};
530 bool use_r1b_resp = use_busy_signal;
531 unsigned char old_timing = host->ios.timing;
533 mmc_retune_hold(host);
536 pr_warn("%s: unspecified timeout for CMD6 - use generic\n",
538 timeout_ms = card->ext_csd.generic_cmd6_time;
542 * If the max_busy_timeout of the host is specified, make sure it's
543 * enough to fit the used timeout_ms. In case it's not, let's instruct
544 * the host to avoid HW busy detection, by converting to a R1 response
545 * instead of a R1B. Note, some hosts requires R1B, which also means
546 * they are on their own when it comes to deal with the busy timeout.
548 if (!(host->caps & MMC_CAP_NEED_RSP_BUSY) && host->max_busy_timeout &&
549 (timeout_ms > host->max_busy_timeout))
550 use_r1b_resp = false;
552 cmd.opcode = MMC_SWITCH;
553 cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
557 cmd.flags = MMC_CMD_AC;
559 cmd.flags |= MMC_RSP_SPI_R1B | MMC_RSP_R1B;
560 cmd.busy_timeout = timeout_ms;
562 cmd.flags |= MMC_RSP_SPI_R1 | MMC_RSP_R1;
565 if (index == EXT_CSD_SANITIZE_START)
566 cmd.sanitize_busy = true;
568 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
572 /* No need to check card status in case of unblocking command */
573 if (!use_busy_signal)
576 /*If SPI or used HW busy detection above, then we don't need to poll. */
577 if (((host->caps & MMC_CAP_WAIT_WHILE_BUSY) && use_r1b_resp) ||
578 mmc_host_is_spi(host))
581 /* Let's try to poll to find out when the command is completed. */
582 err = mmc_poll_for_busy(card, timeout_ms, send_status, retry_crc_err);
587 /* Switch to new timing before check switch status. */
589 mmc_set_timing(host, timing);
592 err = mmc_switch_status(card);
594 mmc_set_timing(host, old_timing);
597 mmc_retune_release(host);
602 int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
603 unsigned int timeout_ms)
605 return __mmc_switch(card, set, index, value, timeout_ms, 0,
608 EXPORT_SYMBOL_GPL(mmc_switch);
610 int mmc_send_tuning(struct mmc_host *host, u32 opcode, int *cmd_error)
612 struct mmc_request mrq = {};
613 struct mmc_command cmd = {};
614 struct mmc_data data = {};
615 struct scatterlist sg;
616 struct mmc_ios *ios = &host->ios;
617 const u8 *tuning_block_pattern;
621 if (ios->bus_width == MMC_BUS_WIDTH_8) {
622 tuning_block_pattern = tuning_blk_pattern_8bit;
623 size = sizeof(tuning_blk_pattern_8bit);
624 } else if (ios->bus_width == MMC_BUS_WIDTH_4) {
625 tuning_block_pattern = tuning_blk_pattern_4bit;
626 size = sizeof(tuning_blk_pattern_4bit);
630 data_buf = kzalloc(size, GFP_KERNEL);
638 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
642 data.flags = MMC_DATA_READ;
645 * According to the tuning specs, Tuning process
646 * is normally shorter 40 executions of CMD19,
647 * and timeout value should be shorter than 150 ms
649 data.timeout_ns = 150 * NSEC_PER_MSEC;
653 sg_init_one(&sg, data_buf, size);
655 mmc_wait_for_req(host, &mrq);
658 *cmd_error = cmd.error;
670 if (memcmp(data_buf, tuning_block_pattern, size))
677 EXPORT_SYMBOL_GPL(mmc_send_tuning);
679 int mmc_abort_tuning(struct mmc_host *host, u32 opcode)
681 struct mmc_command cmd = {};
684 * eMMC specification specifies that CMD12 can be used to stop a tuning
685 * command, but SD specification does not, so do nothing unless it is
688 if (opcode != MMC_SEND_TUNING_BLOCK_HS200)
691 cmd.opcode = MMC_STOP_TRANSMISSION;
692 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
695 * For drivers that override R1 to R1b, set an arbitrary timeout based
696 * on the tuning timeout i.e. 150ms.
698 cmd.busy_timeout = 150;
700 return mmc_wait_for_cmd(host, &cmd, 0);
702 EXPORT_SYMBOL_GPL(mmc_abort_tuning);
705 mmc_send_bus_test(struct mmc_card *card, struct mmc_host *host, u8 opcode,
708 struct mmc_request mrq = {};
709 struct mmc_command cmd = {};
710 struct mmc_data data = {};
711 struct scatterlist sg;
715 static u8 testdata_8bit[8] = { 0x55, 0xaa, 0, 0, 0, 0, 0, 0 };
716 static u8 testdata_4bit[4] = { 0x5a, 0, 0, 0 };
718 /* dma onto stack is unsafe/nonportable, but callers to this
719 * routine normally provide temporary on-stack buffers ...
721 data_buf = kmalloc(len, GFP_KERNEL);
726 test_buf = testdata_8bit;
728 test_buf = testdata_4bit;
730 pr_err("%s: Invalid bus_width %d\n",
731 mmc_hostname(host), len);
736 if (opcode == MMC_BUS_TEST_W)
737 memcpy(data_buf, test_buf, len);
744 /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
745 * rely on callers to never use this with "native" calls for reading
746 * CSD or CID. Native versions of those commands use the R2 type,
747 * not R1 plus a data block.
749 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
753 if (opcode == MMC_BUS_TEST_R)
754 data.flags = MMC_DATA_READ;
756 data.flags = MMC_DATA_WRITE;
760 mmc_set_data_timeout(&data, card);
761 sg_init_one(&sg, data_buf, len);
762 mmc_wait_for_req(host, &mrq);
764 if (opcode == MMC_BUS_TEST_R) {
765 for (i = 0; i < len / 4; i++)
766 if ((test_buf[i] ^ data_buf[i]) != 0xff) {
781 int mmc_bus_test(struct mmc_card *card, u8 bus_width)
785 if (bus_width == MMC_BUS_WIDTH_8)
787 else if (bus_width == MMC_BUS_WIDTH_4)
789 else if (bus_width == MMC_BUS_WIDTH_1)
790 return 0; /* no need for test */
795 * Ignore errors from BUS_TEST_W. BUS_TEST_R will fail if there
796 * is a problem. This improves chances that the test will work.
798 mmc_send_bus_test(card, card->host, MMC_BUS_TEST_W, width);
799 return mmc_send_bus_test(card, card->host, MMC_BUS_TEST_R, width);
802 static int mmc_send_hpi_cmd(struct mmc_card *card, u32 *status)
804 struct mmc_command cmd = {};
808 opcode = card->ext_csd.hpi_cmd;
809 if (opcode == MMC_STOP_TRANSMISSION)
810 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
811 else if (opcode == MMC_SEND_STATUS)
812 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
815 cmd.arg = card->rca << 16 | 1;
817 err = mmc_wait_for_cmd(card->host, &cmd, 0);
819 pr_warn("%s: error %d interrupting operation. "
820 "HPI command response %#x\n", mmc_hostname(card->host),
825 *status = cmd.resp[0];
831 * mmc_interrupt_hpi - Issue for High priority Interrupt
832 * @card: the MMC card associated with the HPI transfer
834 * Issued High Priority Interrupt, and check for card status
835 * until out-of prg-state.
837 int mmc_interrupt_hpi(struct mmc_card *card)
841 unsigned long prg_wait;
843 if (!card->ext_csd.hpi_en) {
844 pr_info("%s: HPI enable bit unset\n", mmc_hostname(card->host));
848 err = mmc_send_status(card, &status);
850 pr_err("%s: Get card status fail\n", mmc_hostname(card->host));
854 switch (R1_CURRENT_STATE(status)) {
860 * In idle and transfer states, HPI is not needed and the caller
861 * can issue the next intended command immediately
867 /* In all other states, it's illegal to issue HPI */
868 pr_debug("%s: HPI cannot be sent. Card state=%d\n",
869 mmc_hostname(card->host), R1_CURRENT_STATE(status));
874 err = mmc_send_hpi_cmd(card, &status);
878 prg_wait = jiffies + msecs_to_jiffies(card->ext_csd.out_of_int_time);
880 err = mmc_send_status(card, &status);
882 if (!err && R1_CURRENT_STATE(status) == R1_STATE_TRAN)
884 if (time_after(jiffies, prg_wait))
892 int mmc_can_ext_csd(struct mmc_card *card)
894 return (card && card->csd.mmca_vsn > CSD_SPEC_VER_3);
897 static int mmc_read_bkops_status(struct mmc_card *card)
902 err = mmc_get_ext_csd(card, &ext_csd);
906 card->ext_csd.raw_bkops_status = ext_csd[EXT_CSD_BKOPS_STATUS];
907 card->ext_csd.raw_exception_status = ext_csd[EXT_CSD_EXP_EVENTS_STATUS];
913 * mmc_run_bkops - Run BKOPS for supported cards
914 * @card: MMC card to run BKOPS for
916 * Run background operations synchronously for cards having manual BKOPS
917 * enabled and in case it reports urgent BKOPS level.
919 void mmc_run_bkops(struct mmc_card *card)
923 if (!card->ext_csd.man_bkops_en)
926 err = mmc_read_bkops_status(card);
928 pr_err("%s: Failed to read bkops status: %d\n",
929 mmc_hostname(card->host), err);
933 if (!card->ext_csd.raw_bkops_status ||
934 card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2)
937 mmc_retune_hold(card->host);
940 * For urgent BKOPS status, LEVEL_2 and higher, let's execute
941 * synchronously. Future wise, we may consider to start BKOPS, for less
942 * urgent levels by using an asynchronous background task, when idle.
944 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
945 EXT_CSD_BKOPS_START, 1, MMC_BKOPS_TIMEOUT_MS);
947 pr_warn("%s: Error %d starting bkops\n",
948 mmc_hostname(card->host), err);
950 mmc_retune_release(card->host);
952 EXPORT_SYMBOL(mmc_run_bkops);
955 * Flush the cache to the non-volatile storage.
957 int mmc_flush_cache(struct mmc_card *card)
961 if (mmc_card_mmc(card) &&
962 (card->ext_csd.cache_size > 0) &&
963 (card->ext_csd.cache_ctrl & 1)) {
964 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
965 EXT_CSD_FLUSH_CACHE, 1,
966 MMC_CACHE_FLUSH_TIMEOUT_MS);
968 pr_err("%s: cache flush error %d\n",
969 mmc_hostname(card->host), err);
974 EXPORT_SYMBOL(mmc_flush_cache);
976 static int mmc_cmdq_switch(struct mmc_card *card, bool enable)
978 u8 val = enable ? EXT_CSD_CMDQ_MODE_ENABLED : 0;
981 if (!card->ext_csd.cmdq_support)
984 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_CMDQ_MODE_EN,
985 val, card->ext_csd.generic_cmd6_time);
987 card->ext_csd.cmdq_en = enable;
992 int mmc_cmdq_enable(struct mmc_card *card)
994 return mmc_cmdq_switch(card, true);
996 EXPORT_SYMBOL_GPL(mmc_cmdq_enable);
998 int mmc_cmdq_disable(struct mmc_card *card)
1000 return mmc_cmdq_switch(card, false);
1002 EXPORT_SYMBOL_GPL(mmc_cmdq_disable);