2 * linux/drivers/mmc/core/mmc_ops.h
4 * Copyright 2006-2007 Pierre Ossman
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or (at
9 * your option) any later version.
12 #include <linux/slab.h>
13 #include <linux/export.h>
14 #include <linux/types.h>
15 #include <linux/scatterlist.h>
17 #include <linux/mmc/host.h>
18 #include <linux/mmc/card.h>
19 #include <linux/mmc/mmc.h>
26 #define MMC_OPS_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute timeout */
28 static const u8 tuning_blk_pattern_4bit[] = {
29 0xff, 0x0f, 0xff, 0x00, 0xff, 0xcc, 0xc3, 0xcc,
30 0xc3, 0x3c, 0xcc, 0xff, 0xfe, 0xff, 0xfe, 0xef,
31 0xff, 0xdf, 0xff, 0xdd, 0xff, 0xfb, 0xff, 0xfb,
32 0xbf, 0xff, 0x7f, 0xff, 0x77, 0xf7, 0xbd, 0xef,
33 0xff, 0xf0, 0xff, 0xf0, 0x0f, 0xfc, 0xcc, 0x3c,
34 0xcc, 0x33, 0xcc, 0xcf, 0xff, 0xef, 0xff, 0xee,
35 0xff, 0xfd, 0xff, 0xfd, 0xdf, 0xff, 0xbf, 0xff,
36 0xbb, 0xff, 0xf7, 0xff, 0xf7, 0x7f, 0x7b, 0xde,
39 static const u8 tuning_blk_pattern_8bit[] = {
40 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0x00, 0x00,
41 0xff, 0xff, 0xcc, 0xcc, 0xcc, 0x33, 0xcc, 0xcc,
42 0xcc, 0x33, 0x33, 0xcc, 0xcc, 0xcc, 0xff, 0xff,
43 0xff, 0xee, 0xff, 0xff, 0xff, 0xee, 0xee, 0xff,
44 0xff, 0xff, 0xdd, 0xff, 0xff, 0xff, 0xdd, 0xdd,
45 0xff, 0xff, 0xff, 0xbb, 0xff, 0xff, 0xff, 0xbb,
46 0xbb, 0xff, 0xff, 0xff, 0x77, 0xff, 0xff, 0xff,
47 0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee, 0xff,
48 0xff, 0xff, 0xff, 0x00, 0xff, 0xff, 0xff, 0x00,
49 0x00, 0xff, 0xff, 0xcc, 0xcc, 0xcc, 0x33, 0xcc,
50 0xcc, 0xcc, 0x33, 0x33, 0xcc, 0xcc, 0xcc, 0xff,
51 0xff, 0xff, 0xee, 0xff, 0xff, 0xff, 0xee, 0xee,
52 0xff, 0xff, 0xff, 0xdd, 0xff, 0xff, 0xff, 0xdd,
53 0xdd, 0xff, 0xff, 0xff, 0xbb, 0xff, 0xff, 0xff,
54 0xbb, 0xbb, 0xff, 0xff, 0xff, 0x77, 0xff, 0xff,
55 0xff, 0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee,
58 int __mmc_send_status(struct mmc_card *card, u32 *status, unsigned int retries)
61 struct mmc_command cmd = {};
63 cmd.opcode = MMC_SEND_STATUS;
64 if (!mmc_host_is_spi(card->host))
65 cmd.arg = card->rca << 16;
66 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
68 err = mmc_wait_for_cmd(card->host, &cmd, retries);
72 /* NOTE: callers are required to understand the difference
73 * between "native" and SPI format status words!
76 *status = cmd.resp[0];
80 EXPORT_SYMBOL_GPL(__mmc_send_status);
82 int mmc_send_status(struct mmc_card *card, u32 *status)
84 return __mmc_send_status(card, status, MMC_CMD_RETRIES);
86 EXPORT_SYMBOL_GPL(mmc_send_status);
88 static int _mmc_select_card(struct mmc_host *host, struct mmc_card *card)
90 struct mmc_command cmd = {};
92 cmd.opcode = MMC_SELECT_CARD;
95 cmd.arg = card->rca << 16;
96 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
99 cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
102 return mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
105 int mmc_select_card(struct mmc_card *card)
108 return _mmc_select_card(card->host, card);
111 int mmc_deselect_cards(struct mmc_host *host)
113 return _mmc_select_card(host, NULL);
117 * Write the value specified in the device tree or board code into the optional
118 * 16 bit Driver Stage Register. This can be used to tune raise/fall times and
119 * drive strength of the DAT and CMD outputs. The actual meaning of a given
120 * value is hardware dependant.
121 * The presence of the DSR register can be determined from the CSD register,
124 int mmc_set_dsr(struct mmc_host *host)
126 struct mmc_command cmd = {};
128 cmd.opcode = MMC_SET_DSR;
130 cmd.arg = (host->dsr << 16) | 0xffff;
131 cmd.flags = MMC_RSP_NONE | MMC_CMD_AC;
133 return mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
136 int mmc_go_idle(struct mmc_host *host)
139 struct mmc_command cmd = {};
142 * Non-SPI hosts need to prevent chipselect going active during
143 * GO_IDLE; that would put chips into SPI mode. Remind them of
144 * that in case of hardware that won't pull up DAT3/nCS otherwise.
146 * SPI hosts ignore ios.chip_select; it's managed according to
147 * rules that must accommodate non-MMC slaves which this layer
148 * won't even know about.
150 if (!mmc_host_is_spi(host)) {
151 mmc_set_chip_select(host, MMC_CS_HIGH);
155 cmd.opcode = MMC_GO_IDLE_STATE;
157 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_NONE | MMC_CMD_BC;
159 err = mmc_wait_for_cmd(host, &cmd, 0);
163 if (!mmc_host_is_spi(host)) {
164 mmc_set_chip_select(host, MMC_CS_DONTCARE);
168 host->use_spi_crc = 0;
173 int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
175 struct mmc_command cmd = {};
178 cmd.opcode = MMC_SEND_OP_COND;
179 cmd.arg = mmc_host_is_spi(host) ? 0 : ocr;
180 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R3 | MMC_CMD_BCR;
182 for (i = 100; i; i--) {
183 err = mmc_wait_for_cmd(host, &cmd, 0);
187 /* wait until reset completes */
188 if (mmc_host_is_spi(host)) {
189 if (!(cmd.resp[0] & R1_SPI_IDLE))
192 if (cmd.resp[0] & MMC_CARD_BUSY)
201 * According to eMMC specification v5.1 section 6.4.3, we
202 * should issue CMD1 repeatedly in the idle state until
203 * the eMMC is ready. Otherwise some eMMC devices seem to enter
204 * the inactive mode after mmc_init_card() issued CMD0 when
205 * the eMMC device is busy.
207 if (!ocr && !mmc_host_is_spi(host))
208 cmd.arg = cmd.resp[0] | BIT(30);
211 if (rocr && !mmc_host_is_spi(host))
217 int mmc_set_relative_addr(struct mmc_card *card)
219 struct mmc_command cmd = {};
221 cmd.opcode = MMC_SET_RELATIVE_ADDR;
222 cmd.arg = card->rca << 16;
223 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
225 return mmc_wait_for_cmd(card->host, &cmd, MMC_CMD_RETRIES);
229 mmc_send_cxd_native(struct mmc_host *host, u32 arg, u32 *cxd, int opcode)
232 struct mmc_command cmd = {};
236 cmd.flags = MMC_RSP_R2 | MMC_CMD_AC;
238 err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
242 memcpy(cxd, cmd.resp, sizeof(u32) * 4);
248 * NOTE: void *buf, caller for the buf is required to use DMA-capable
249 * buffer or on-stack buffer (with some overhead in callee).
252 mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
253 u32 opcode, void *buf, unsigned len)
255 struct mmc_request mrq = {};
256 struct mmc_command cmd = {};
257 struct mmc_data data = {};
258 struct scatterlist sg;
266 /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
267 * rely on callers to never use this with "native" calls for reading
268 * CSD or CID. Native versions of those commands use the R2 type,
269 * not R1 plus a data block.
271 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
275 data.flags = MMC_DATA_READ;
279 sg_init_one(&sg, buf, len);
281 if (opcode == MMC_SEND_CSD || opcode == MMC_SEND_CID) {
283 * The spec states that CSR and CID accesses have a timeout
284 * of 64 clock cycles.
287 data.timeout_clks = 64;
289 mmc_set_data_timeout(&data, card);
291 mmc_wait_for_req(host, &mrq);
301 static int mmc_spi_send_csd(struct mmc_card *card, u32 *csd)
306 csd_tmp = kzalloc(16, GFP_KERNEL);
310 ret = mmc_send_cxd_data(card, card->host, MMC_SEND_CSD, csd_tmp, 16);
314 for (i = 0; i < 4; i++)
315 csd[i] = be32_to_cpu(csd_tmp[i]);
322 int mmc_send_csd(struct mmc_card *card, u32 *csd)
324 if (mmc_host_is_spi(card->host))
325 return mmc_spi_send_csd(card, csd);
327 return mmc_send_cxd_native(card->host, card->rca << 16, csd,
331 static int mmc_spi_send_cid(struct mmc_host *host, u32 *cid)
336 cid_tmp = kzalloc(16, GFP_KERNEL);
340 ret = mmc_send_cxd_data(NULL, host, MMC_SEND_CID, cid_tmp, 16);
344 for (i = 0; i < 4; i++)
345 cid[i] = be32_to_cpu(cid_tmp[i]);
352 int mmc_send_cid(struct mmc_host *host, u32 *cid)
354 if (mmc_host_is_spi(host))
355 return mmc_spi_send_cid(host, cid);
357 return mmc_send_cxd_native(host, 0, cid, MMC_ALL_SEND_CID);
360 int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd)
365 if (!card || !new_ext_csd)
368 if (!mmc_can_ext_csd(card))
372 * As the ext_csd is so large and mostly unused, we don't store the
373 * raw block in mmc_card.
375 ext_csd = kzalloc(512, GFP_KERNEL);
379 err = mmc_send_cxd_data(card, card->host, MMC_SEND_EXT_CSD, ext_csd,
384 *new_ext_csd = ext_csd;
388 EXPORT_SYMBOL_GPL(mmc_get_ext_csd);
390 int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp)
392 struct mmc_command cmd = {};
395 cmd.opcode = MMC_SPI_READ_OCR;
396 cmd.arg = highcap ? (1 << 30) : 0;
397 cmd.flags = MMC_RSP_SPI_R3;
399 err = mmc_wait_for_cmd(host, &cmd, 0);
405 int mmc_spi_set_crc(struct mmc_host *host, int use_crc)
407 struct mmc_command cmd = {};
410 cmd.opcode = MMC_SPI_CRC_ON_OFF;
411 cmd.flags = MMC_RSP_SPI_R1;
414 err = mmc_wait_for_cmd(host, &cmd, 0);
416 host->use_spi_crc = use_crc;
420 static int mmc_switch_status_error(struct mmc_host *host, u32 status)
422 if (mmc_host_is_spi(host)) {
423 if (status & R1_SPI_ILLEGAL_COMMAND)
426 if (R1_STATUS(status))
427 pr_warn("%s: unexpected status %#x after switch\n",
428 mmc_hostname(host), status);
429 if (status & R1_SWITCH_ERROR)
435 /* Caller must hold re-tuning */
436 int __mmc_switch_status(struct mmc_card *card, bool crc_err_fatal)
441 err = mmc_send_status(card, &status);
442 if (!crc_err_fatal && err == -EILSEQ)
447 return mmc_switch_status_error(card->host, status);
450 int mmc_switch_status(struct mmc_card *card)
452 return __mmc_switch_status(card, true);
455 static int mmc_poll_for_busy(struct mmc_card *card, unsigned int timeout_ms,
456 bool send_status, bool retry_crc_err)
458 struct mmc_host *host = card->host;
460 unsigned long timeout;
462 bool expired = false;
465 /* We have an unspecified cmd timeout, use the fallback value. */
467 timeout_ms = MMC_OPS_TIMEOUT_MS;
470 * In cases when not allowed to poll by using CMD13 or because we aren't
471 * capable of polling by using ->card_busy(), then rely on waiting the
472 * stated timeout to be sufficient.
474 if (!send_status && !host->ops->card_busy) {
475 mmc_delay(timeout_ms);
479 timeout = jiffies + msecs_to_jiffies(timeout_ms) + 1;
482 * Due to the possibility of being preempted while polling,
483 * check the expiration time first.
485 expired = time_after(jiffies, timeout);
487 if (host->ops->card_busy) {
488 busy = host->ops->card_busy(host);
490 err = mmc_send_status(card, &status);
491 if (retry_crc_err && err == -EILSEQ) {
496 err = mmc_switch_status_error(host, status);
499 busy = R1_CURRENT_STATE(status) == R1_STATE_PRG;
503 /* Timeout if the device still remains busy. */
504 if (expired && busy) {
505 pr_err("%s: Card stuck being busy! %s\n",
506 mmc_hostname(host), __func__);
515 * __mmc_switch - modify EXT_CSD register
516 * @card: the MMC card associated with the data transfer
517 * @set: cmd set values
518 * @index: EXT_CSD register index
519 * @value: value to program into EXT_CSD register
520 * @timeout_ms: timeout (ms) for operation performed by register write,
521 * timeout of zero implies maximum possible timeout
522 * @timing: new timing to change to
523 * @use_busy_signal: use the busy signal as response type
524 * @send_status: send status cmd to poll for busy
525 * @retry_crc_err: retry when CRC errors when polling with CMD13 for busy
527 * Modifies the EXT_CSD register for selected card.
529 int __mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
530 unsigned int timeout_ms, unsigned char timing,
531 bool use_busy_signal, bool send_status, bool retry_crc_err)
533 struct mmc_host *host = card->host;
535 struct mmc_command cmd = {};
536 bool use_r1b_resp = use_busy_signal;
537 unsigned char old_timing = host->ios.timing;
539 mmc_retune_hold(host);
542 * If the cmd timeout and the max_busy_timeout of the host are both
543 * specified, let's validate them. A failure means we need to prevent
544 * the host from doing hw busy detection, which is done by converting
545 * to a R1 response instead of a R1B.
547 if (timeout_ms && host->max_busy_timeout &&
548 (timeout_ms > host->max_busy_timeout))
549 use_r1b_resp = false;
551 cmd.opcode = MMC_SWITCH;
552 cmd.arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
556 cmd.flags = MMC_CMD_AC;
558 cmd.flags |= MMC_RSP_SPI_R1B | MMC_RSP_R1B;
560 * A busy_timeout of zero means the host can decide to use
561 * whatever value it finds suitable.
563 cmd.busy_timeout = timeout_ms;
565 cmd.flags |= MMC_RSP_SPI_R1 | MMC_RSP_R1;
568 if (index == EXT_CSD_SANITIZE_START)
569 cmd.sanitize_busy = true;
571 err = mmc_wait_for_cmd(host, &cmd, 0);
575 /* No need to check card status in case of unblocking command */
576 if (!use_busy_signal)
579 /*If SPI or used HW busy detection above, then we don't need to poll. */
580 if (((host->caps & MMC_CAP_WAIT_WHILE_BUSY) && use_r1b_resp) ||
581 mmc_host_is_spi(host))
584 /* Let's try to poll to find out when the command is completed. */
585 err = mmc_poll_for_busy(card, timeout_ms, send_status, retry_crc_err);
590 /* Switch to new timing before check switch status. */
592 mmc_set_timing(host, timing);
595 err = mmc_switch_status(card);
597 mmc_set_timing(host, old_timing);
600 mmc_retune_release(host);
605 int mmc_switch(struct mmc_card *card, u8 set, u8 index, u8 value,
606 unsigned int timeout_ms)
608 return __mmc_switch(card, set, index, value, timeout_ms, 0,
611 EXPORT_SYMBOL_GPL(mmc_switch);
613 int mmc_send_tuning(struct mmc_host *host, u32 opcode, int *cmd_error)
615 struct mmc_request mrq = {};
616 struct mmc_command cmd = {};
617 struct mmc_data data = {};
618 struct scatterlist sg;
619 struct mmc_ios *ios = &host->ios;
620 const u8 *tuning_block_pattern;
624 if (ios->bus_width == MMC_BUS_WIDTH_8) {
625 tuning_block_pattern = tuning_blk_pattern_8bit;
626 size = sizeof(tuning_blk_pattern_8bit);
627 } else if (ios->bus_width == MMC_BUS_WIDTH_4) {
628 tuning_block_pattern = tuning_blk_pattern_4bit;
629 size = sizeof(tuning_blk_pattern_4bit);
633 data_buf = kzalloc(size, GFP_KERNEL);
641 cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
645 data.flags = MMC_DATA_READ;
648 * According to the tuning specs, Tuning process
649 * is normally shorter 40 executions of CMD19,
650 * and timeout value should be shorter than 150 ms
652 data.timeout_ns = 150 * NSEC_PER_MSEC;
656 sg_init_one(&sg, data_buf, size);
658 mmc_wait_for_req(host, &mrq);
661 *cmd_error = cmd.error;
673 if (memcmp(data_buf, tuning_block_pattern, size))
680 EXPORT_SYMBOL_GPL(mmc_send_tuning);
682 int mmc_abort_tuning(struct mmc_host *host, u32 opcode)
684 struct mmc_command cmd = {};
687 * eMMC specification specifies that CMD12 can be used to stop a tuning
688 * command, but SD specification does not, so do nothing unless it is
691 if (opcode != MMC_SEND_TUNING_BLOCK_HS200)
694 cmd.opcode = MMC_STOP_TRANSMISSION;
695 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
698 * For drivers that override R1 to R1b, set an arbitrary timeout based
699 * on the tuning timeout i.e. 150ms.
701 cmd.busy_timeout = 150;
703 return mmc_wait_for_cmd(host, &cmd, 0);
705 EXPORT_SYMBOL_GPL(mmc_abort_tuning);
708 mmc_send_bus_test(struct mmc_card *card, struct mmc_host *host, u8 opcode,
711 struct mmc_request mrq = {};
712 struct mmc_command cmd = {};
713 struct mmc_data data = {};
714 struct scatterlist sg;
718 static u8 testdata_8bit[8] = { 0x55, 0xaa, 0, 0, 0, 0, 0, 0 };
719 static u8 testdata_4bit[4] = { 0x5a, 0, 0, 0 };
721 /* dma onto stack is unsafe/nonportable, but callers to this
722 * routine normally provide temporary on-stack buffers ...
724 data_buf = kmalloc(len, GFP_KERNEL);
729 test_buf = testdata_8bit;
731 test_buf = testdata_4bit;
733 pr_err("%s: Invalid bus_width %d\n",
734 mmc_hostname(host), len);
739 if (opcode == MMC_BUS_TEST_W)
740 memcpy(data_buf, test_buf, len);
747 /* NOTE HACK: the MMC_RSP_SPI_R1 is always correct here, but we
748 * rely on callers to never use this with "native" calls for reading
749 * CSD or CID. Native versions of those commands use the R2 type,
750 * not R1 plus a data block.
752 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
756 if (opcode == MMC_BUS_TEST_R)
757 data.flags = MMC_DATA_READ;
759 data.flags = MMC_DATA_WRITE;
763 mmc_set_data_timeout(&data, card);
764 sg_init_one(&sg, data_buf, len);
765 mmc_wait_for_req(host, &mrq);
767 if (opcode == MMC_BUS_TEST_R) {
768 for (i = 0; i < len / 4; i++)
769 if ((test_buf[i] ^ data_buf[i]) != 0xff) {
784 int mmc_bus_test(struct mmc_card *card, u8 bus_width)
788 if (bus_width == MMC_BUS_WIDTH_8)
790 else if (bus_width == MMC_BUS_WIDTH_4)
792 else if (bus_width == MMC_BUS_WIDTH_1)
793 return 0; /* no need for test */
798 * Ignore errors from BUS_TEST_W. BUS_TEST_R will fail if there
799 * is a problem. This improves chances that the test will work.
801 mmc_send_bus_test(card, card->host, MMC_BUS_TEST_W, width);
802 return mmc_send_bus_test(card, card->host, MMC_BUS_TEST_R, width);
805 static int mmc_send_hpi_cmd(struct mmc_card *card, u32 *status)
807 struct mmc_command cmd = {};
811 opcode = card->ext_csd.hpi_cmd;
812 if (opcode == MMC_STOP_TRANSMISSION)
813 cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
814 else if (opcode == MMC_SEND_STATUS)
815 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
818 cmd.arg = card->rca << 16 | 1;
820 err = mmc_wait_for_cmd(card->host, &cmd, 0);
822 pr_warn("%s: error %d interrupting operation. "
823 "HPI command response %#x\n", mmc_hostname(card->host),
828 *status = cmd.resp[0];
834 * mmc_interrupt_hpi - Issue for High priority Interrupt
835 * @card: the MMC card associated with the HPI transfer
837 * Issued High Priority Interrupt, and check for card status
838 * until out-of prg-state.
840 int mmc_interrupt_hpi(struct mmc_card *card)
844 unsigned long prg_wait;
846 if (!card->ext_csd.hpi_en) {
847 pr_info("%s: HPI enable bit unset\n", mmc_hostname(card->host));
851 err = mmc_send_status(card, &status);
853 pr_err("%s: Get card status fail\n", mmc_hostname(card->host));
857 switch (R1_CURRENT_STATE(status)) {
863 * In idle and transfer states, HPI is not needed and the caller
864 * can issue the next intended command immediately
870 /* In all other states, it's illegal to issue HPI */
871 pr_debug("%s: HPI cannot be sent. Card state=%d\n",
872 mmc_hostname(card->host), R1_CURRENT_STATE(status));
877 err = mmc_send_hpi_cmd(card, &status);
881 prg_wait = jiffies + msecs_to_jiffies(card->ext_csd.out_of_int_time);
883 err = mmc_send_status(card, &status);
885 if (!err && R1_CURRENT_STATE(status) == R1_STATE_TRAN)
887 if (time_after(jiffies, prg_wait))
895 int mmc_can_ext_csd(struct mmc_card *card)
897 return (card && card->csd.mmca_vsn > CSD_SPEC_VER_3);
900 static int mmc_read_bkops_status(struct mmc_card *card)
905 err = mmc_get_ext_csd(card, &ext_csd);
909 card->ext_csd.raw_bkops_status = ext_csd[EXT_CSD_BKOPS_STATUS];
910 card->ext_csd.raw_exception_status = ext_csd[EXT_CSD_EXP_EVENTS_STATUS];
916 * mmc_run_bkops - Run BKOPS for supported cards
917 * @card: MMC card to run BKOPS for
919 * Run background operations synchronously for cards having manual BKOPS
920 * enabled and in case it reports urgent BKOPS level.
922 void mmc_run_bkops(struct mmc_card *card)
926 if (!card->ext_csd.man_bkops_en)
929 err = mmc_read_bkops_status(card);
931 pr_err("%s: Failed to read bkops status: %d\n",
932 mmc_hostname(card->host), err);
936 if (!card->ext_csd.raw_bkops_status ||
937 card->ext_csd.raw_bkops_status < EXT_CSD_BKOPS_LEVEL_2)
940 mmc_retune_hold(card->host);
943 * For urgent BKOPS status, LEVEL_2 and higher, let's execute
944 * synchronously. Future wise, we may consider to start BKOPS, for less
945 * urgent levels by using an asynchronous background task, when idle.
947 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
948 EXT_CSD_BKOPS_START, 1, MMC_OPS_TIMEOUT_MS);
950 pr_warn("%s: Error %d starting bkops\n",
951 mmc_hostname(card->host), err);
953 mmc_retune_release(card->host);
955 EXPORT_SYMBOL(mmc_run_bkops);
958 * Flush the cache to the non-volatile storage.
960 int mmc_flush_cache(struct mmc_card *card)
964 if (mmc_card_mmc(card) &&
965 (card->ext_csd.cache_size > 0) &&
966 (card->ext_csd.cache_ctrl & 1)) {
967 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
968 EXT_CSD_FLUSH_CACHE, 1, 0);
970 pr_err("%s: cache flush error %d\n",
971 mmc_hostname(card->host), err);
976 EXPORT_SYMBOL(mmc_flush_cache);
978 static int mmc_cmdq_switch(struct mmc_card *card, bool enable)
980 u8 val = enable ? EXT_CSD_CMDQ_MODE_ENABLED : 0;
983 if (!card->ext_csd.cmdq_support)
986 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_CMDQ_MODE_EN,
987 val, card->ext_csd.generic_cmd6_time);
989 card->ext_csd.cmdq_en = enable;
994 int mmc_cmdq_enable(struct mmc_card *card)
996 return mmc_cmdq_switch(card, true);
998 EXPORT_SYMBOL_GPL(mmc_cmdq_enable);
1000 int mmc_cmdq_disable(struct mmc_card *card)
1002 return mmc_cmdq_switch(card, false);
1004 EXPORT_SYMBOL_GPL(mmc_cmdq_disable);