2 * Block driver for media (i.e., flash cards)
4 * Copyright 2002 Hewlett-Packard Company
5 * Copyright 2005-2008 Pierre Ossman
7 * Use consistent with the GNU GPL is permitted,
8 * provided that this copyright notice is
9 * preserved in its entirety in all copies and derived works.
11 * HEWLETT-PACKARD COMPANY MAKES NO WARRANTIES, EXPRESSED OR IMPLIED,
12 * AS TO THE USEFULNESS OR CORRECTNESS OF THIS CODE OR ITS
13 * FITNESS FOR ANY PARTICULAR PURPOSE.
15 * Many thanks to Alessandro Rubini and Jonathan Corbet!
17 * Author: Andrew Christian
20 #include <linux/moduleparam.h>
21 #include <linux/module.h>
22 #include <linux/init.h>
24 #include <linux/kernel.h>
26 #include <linux/slab.h>
27 #include <linux/errno.h>
28 #include <linux/hdreg.h>
29 #include <linux/kdev_t.h>
30 #include <linux/blkdev.h>
31 #include <linux/mutex.h>
32 #include <linux/scatterlist.h>
33 #include <linux/string_helpers.h>
34 #include <linux/delay.h>
35 #include <linux/capability.h>
36 #include <linux/compat.h>
38 #include <linux/mmc/ioctl.h>
39 #include <linux/mmc/card.h>
40 #include <linux/mmc/host.h>
41 #include <linux/mmc/mmc.h>
42 #include <linux/mmc/sd.h>
44 #include <asm/system.h>
45 #include <asm/uaccess.h>
49 MODULE_ALIAS("mmc:block");
50 #ifdef MODULE_PARAM_PREFIX
51 #undef MODULE_PARAM_PREFIX
53 #define MODULE_PARAM_PREFIX "mmcblk."
55 #define INAND_CMD38_ARG_EXT_CSD 113
56 #define INAND_CMD38_ARG_ERASE 0x00
57 #define INAND_CMD38_ARG_TRIM 0x01
58 #define INAND_CMD38_ARG_SECERASE 0x80
59 #define INAND_CMD38_ARG_SECTRIM1 0x81
60 #define INAND_CMD38_ARG_SECTRIM2 0x88
62 static DEFINE_MUTEX(block_mutex);
65 * The defaults come from config options but can be overriden by module
68 static int perdev_minors = CONFIG_MMC_BLOCK_MINORS;
71 * We've only got one major, so number of mmcblk devices is
72 * limited to 256 / number of minors per device.
74 static int max_devices;
76 /* 256 minors, so at most 256 separate devices */
77 static DECLARE_BITMAP(dev_use, 256);
78 static DECLARE_BITMAP(name_use, 256);
81 * There is one mmc_blk_data per slot.
86 struct mmc_queue queue;
87 struct list_head part;
90 #define MMC_BLK_CMD23 (1 << 0) /* Can do SET_BLOCK_COUNT for multiblock */
91 #define MMC_BLK_REL_WR (1 << 1) /* MMC Reliable write support */
94 unsigned int read_only;
95 unsigned int part_type;
96 unsigned int name_idx;
97 unsigned int reset_done;
98 #define MMC_BLK_READ BIT(0)
99 #define MMC_BLK_WRITE BIT(1)
100 #define MMC_BLK_DISCARD BIT(2)
101 #define MMC_BLK_SECDISCARD BIT(3)
104 * Only set in main mmc_blk_data associated
105 * with mmc_card with mmc_set_drvdata, and keeps
106 * track of the current selected device partition.
108 unsigned int part_curr;
109 struct device_attribute force_ro;
110 struct device_attribute power_ro_lock;
114 static DEFINE_MUTEX(open_lock);
116 enum mmc_blk_status {
127 module_param(perdev_minors, int, 0444);
128 MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
130 static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
132 struct mmc_blk_data *md;
134 mutex_lock(&open_lock);
135 md = disk->private_data;
136 if (md && md->usage == 0)
140 mutex_unlock(&open_lock);
145 static inline int mmc_get_devidx(struct gendisk *disk)
147 int devidx = disk->first_minor / perdev_minors;
151 static void mmc_blk_put(struct mmc_blk_data *md)
153 mutex_lock(&open_lock);
155 if (md->usage == 0) {
156 int devidx = mmc_get_devidx(md->disk);
157 blk_cleanup_queue(md->queue.queue);
159 __clear_bit(devidx, dev_use);
164 mutex_unlock(&open_lock);
167 static ssize_t power_ro_lock_show(struct device *dev,
168 struct device_attribute *attr, char *buf)
171 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
172 struct mmc_card *card = md->queue.card;
175 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PERM_WP_EN)
177 else if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_EN)
180 ret = snprintf(buf, PAGE_SIZE, "%d\n", locked);
185 static ssize_t power_ro_lock_store(struct device *dev,
186 struct device_attribute *attr, const char *buf, size_t count)
189 struct mmc_blk_data *md, *part_md;
190 struct mmc_card *card;
193 if (kstrtoul(buf, 0, &set))
199 md = mmc_blk_get(dev_to_disk(dev));
200 card = md->queue.card;
202 mmc_claim_host(card->host);
204 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP,
205 card->ext_csd.boot_ro_lock |
206 EXT_CSD_BOOT_WP_B_PWR_WP_EN,
207 card->ext_csd.part_time);
209 pr_err("%s: Locking boot partition ro until next power on failed: %d\n", md->disk->disk_name, ret);
211 card->ext_csd.boot_ro_lock |= EXT_CSD_BOOT_WP_B_PWR_WP_EN;
213 mmc_release_host(card->host);
216 pr_info("%s: Locking boot partition ro until next power on\n",
217 md->disk->disk_name);
218 set_disk_ro(md->disk, 1);
220 list_for_each_entry(part_md, &md->part, part)
221 if (part_md->area_type == MMC_BLK_DATA_AREA_BOOT) {
222 pr_info("%s: Locking boot partition ro until next power on\n", part_md->disk->disk_name);
223 set_disk_ro(part_md->disk, 1);
231 static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
235 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
237 ret = snprintf(buf, PAGE_SIZE, "%d",
238 get_disk_ro(dev_to_disk(dev)) ^
244 static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
245 const char *buf, size_t count)
249 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
250 unsigned long set = simple_strtoul(buf, &end, 0);
256 set_disk_ro(dev_to_disk(dev), set || md->read_only);
263 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
265 struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
268 mutex_lock(&block_mutex);
271 check_disk_change(bdev);
274 if ((mode & FMODE_WRITE) && md->read_only) {
279 mutex_unlock(&block_mutex);
284 static int mmc_blk_release(struct gendisk *disk, fmode_t mode)
286 struct mmc_blk_data *md = disk->private_data;
288 mutex_lock(&block_mutex);
290 mutex_unlock(&block_mutex);
295 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
297 geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
303 struct mmc_blk_ioc_data {
304 struct mmc_ioc_cmd ic;
309 static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
310 struct mmc_ioc_cmd __user *user)
312 struct mmc_blk_ioc_data *idata;
315 idata = kzalloc(sizeof(*idata), GFP_KERNEL);
321 if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
326 idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
327 if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
332 if (!idata->buf_bytes)
335 idata->buf = kzalloc(idata->buf_bytes, GFP_KERNEL);
341 if (copy_from_user(idata->buf, (void __user *)(unsigned long)
342 idata->ic.data_ptr, idata->buf_bytes)) {
357 static int mmc_blk_ioctl_cmd(struct block_device *bdev,
358 struct mmc_ioc_cmd __user *ic_ptr)
360 struct mmc_blk_ioc_data *idata;
361 struct mmc_blk_data *md;
362 struct mmc_card *card;
363 struct mmc_command cmd = {0};
364 struct mmc_data data = {0};
365 struct mmc_request mrq = {NULL};
366 struct scatterlist sg;
370 * The caller must have CAP_SYS_RAWIO, and must be calling this on the
371 * whole block device, not on a partition. This prevents overspray
372 * between sibling partitions.
374 if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
377 idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
379 return PTR_ERR(idata);
381 md = mmc_blk_get(bdev->bd_disk);
387 card = md->queue.card;
393 cmd.opcode = idata->ic.opcode;
394 cmd.arg = idata->ic.arg;
395 cmd.flags = idata->ic.flags;
397 if (idata->buf_bytes) {
400 data.blksz = idata->ic.blksz;
401 data.blocks = idata->ic.blocks;
403 sg_init_one(data.sg, idata->buf, idata->buf_bytes);
405 if (idata->ic.write_flag)
406 data.flags = MMC_DATA_WRITE;
408 data.flags = MMC_DATA_READ;
410 /* data.flags must already be set before doing this. */
411 mmc_set_data_timeout(&data, card);
413 /* Allow overriding the timeout_ns for empirical tuning. */
414 if (idata->ic.data_timeout_ns)
415 data.timeout_ns = idata->ic.data_timeout_ns;
417 if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
419 * Pretend this is a data transfer and rely on the
420 * host driver to compute timeout. When all host
421 * drivers support cmd.cmd_timeout for R1B, this
425 * cmd.cmd_timeout = idata->ic.cmd_timeout_ms;
427 data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000;
435 mmc_claim_host(card->host);
437 if (idata->ic.is_acmd) {
438 err = mmc_app_cmd(card->host, card);
443 mmc_wait_for_req(card->host, &mrq);
446 dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
447 __func__, cmd.error);
452 dev_err(mmc_dev(card->host), "%s: data error %d\n",
453 __func__, data.error);
459 * According to the SD specs, some commands require a delay after
460 * issuing the command.
462 if (idata->ic.postsleep_min_us)
463 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
465 if (copy_to_user(&(ic_ptr->response), cmd.resp, sizeof(cmd.resp))) {
470 if (!idata->ic.write_flag) {
471 if (copy_to_user((void __user *)(unsigned long) idata->ic.data_ptr,
472 idata->buf, idata->buf_bytes)) {
479 mmc_release_host(card->host);
488 static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
489 unsigned int cmd, unsigned long arg)
492 if (cmd == MMC_IOC_CMD)
493 ret = mmc_blk_ioctl_cmd(bdev, (struct mmc_ioc_cmd __user *)arg);
498 static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
499 unsigned int cmd, unsigned long arg)
501 return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
505 static const struct block_device_operations mmc_bdops = {
506 .open = mmc_blk_open,
507 .release = mmc_blk_release,
508 .getgeo = mmc_blk_getgeo,
509 .owner = THIS_MODULE,
510 .ioctl = mmc_blk_ioctl,
512 .compat_ioctl = mmc_blk_compat_ioctl,
516 static inline int mmc_blk_part_switch(struct mmc_card *card,
517 struct mmc_blk_data *md)
520 struct mmc_blk_data *main_md = mmc_get_drvdata(card);
522 if (main_md->part_curr == md->part_type)
525 if (mmc_card_mmc(card)) {
526 u8 part_config = card->ext_csd.part_config;
528 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
529 part_config |= md->part_type;
531 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
532 EXT_CSD_PART_CONFIG, part_config,
533 card->ext_csd.part_time);
537 card->ext_csd.part_config = part_config;
540 main_md->part_curr = md->part_type;
544 static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
550 struct mmc_request mrq = {NULL};
551 struct mmc_command cmd = {0};
552 struct mmc_data data = {0};
553 unsigned int timeout_us;
555 struct scatterlist sg;
557 cmd.opcode = MMC_APP_CMD;
558 cmd.arg = card->rca << 16;
559 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
561 err = mmc_wait_for_cmd(card->host, &cmd, 0);
564 if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
567 memset(&cmd, 0, sizeof(struct mmc_command));
569 cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
571 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
573 data.timeout_ns = card->csd.tacc_ns * 100;
574 data.timeout_clks = card->csd.tacc_clks * 100;
576 timeout_us = data.timeout_ns / 1000;
577 timeout_us += data.timeout_clks * 1000 /
578 (card->host->ios.clock / 1000);
580 if (timeout_us > 100000) {
581 data.timeout_ns = 100000000;
582 data.timeout_clks = 0;
587 data.flags = MMC_DATA_READ;
594 blocks = kmalloc(4, GFP_KERNEL);
598 sg_init_one(&sg, blocks, 4);
600 mmc_wait_for_req(card->host, &mrq);
602 result = ntohl(*blocks);
605 if (cmd.error || data.error)
611 static int send_stop(struct mmc_card *card, u32 *status)
613 struct mmc_command cmd = {0};
616 cmd.opcode = MMC_STOP_TRANSMISSION;
617 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
618 err = mmc_wait_for_cmd(card->host, &cmd, 5);
620 *status = cmd.resp[0];
624 static int get_card_status(struct mmc_card *card, u32 *status, int retries)
626 struct mmc_command cmd = {0};
629 cmd.opcode = MMC_SEND_STATUS;
630 if (!mmc_host_is_spi(card->host))
631 cmd.arg = card->rca << 16;
632 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
633 err = mmc_wait_for_cmd(card->host, &cmd, retries);
635 *status = cmd.resp[0];
639 #define ERR_NOMEDIUM 3
642 #define ERR_CONTINUE 0
644 static int mmc_blk_cmd_error(struct request *req, const char *name, int error,
645 bool status_valid, u32 status)
649 /* response crc error, retry the r/w cmd */
650 pr_err("%s: %s sending %s command, card status %#x\n",
651 req->rq_disk->disk_name, "response CRC error",
656 pr_err("%s: %s sending %s command, card status %#x\n",
657 req->rq_disk->disk_name, "timed out", name, status);
659 /* If the status cmd initially failed, retry the r/w cmd */
664 * If it was a r/w cmd crc error, or illegal command
665 * (eg, issued in wrong state) then retry - we should
666 * have corrected the state problem above.
668 if (status & (R1_COM_CRC_ERROR | R1_ILLEGAL_COMMAND))
671 /* Otherwise abort the command */
675 /* We don't understand the error code the driver gave us */
676 pr_err("%s: unknown error %d sending read/write command, card status %#x\n",
677 req->rq_disk->disk_name, error, status);
683 * Initial r/w and stop cmd error recovery.
684 * We don't know whether the card received the r/w cmd or not, so try to
685 * restore things back to a sane state. Essentially, we do this as follows:
686 * - Obtain card status. If the first attempt to obtain card status fails,
687 * the status word will reflect the failed status cmd, not the failed
688 * r/w cmd. If we fail to obtain card status, it suggests we can no
689 * longer communicate with the card.
690 * - Check the card state. If the card received the cmd but there was a
691 * transient problem with the response, it might still be in a data transfer
692 * mode. Try to send it a stop command. If this fails, we can't recover.
693 * - If the r/w cmd failed due to a response CRC error, it was probably
694 * transient, so retry the cmd.
695 * - If the r/w cmd timed out, but we didn't get the r/w cmd status, retry.
696 * - If the r/w cmd timed out, and the r/w cmd failed due to CRC error or
697 * illegal cmd, retry.
698 * Otherwise we don't understand what happened, so abort.
700 static int mmc_blk_cmd_recovery(struct mmc_card *card, struct request *req,
701 struct mmc_blk_request *brq, int *ecc_err)
703 bool prev_cmd_status_valid = true;
704 u32 status, stop_status = 0;
707 if (mmc_card_removed(card))
711 * Try to get card status which indicates both the card state
712 * and why there was no response. If the first attempt fails,
713 * we can't be sure the returned status is for the r/w command.
715 for (retry = 2; retry >= 0; retry--) {
716 err = get_card_status(card, &status, 0);
720 prev_cmd_status_valid = false;
721 pr_err("%s: error %d sending status command, %sing\n",
722 req->rq_disk->disk_name, err, retry ? "retry" : "abort");
725 /* We couldn't get a response from the card. Give up. */
727 /* Check if the card is removed */
728 if (mmc_detect_card_removed(card->host))
733 /* Flag ECC errors */
734 if ((status & R1_CARD_ECC_FAILED) ||
735 (brq->stop.resp[0] & R1_CARD_ECC_FAILED) ||
736 (brq->cmd.resp[0] & R1_CARD_ECC_FAILED))
740 * Check the current card state. If it is in some data transfer
741 * mode, tell it to stop (and hopefully transition back to TRAN.)
743 if (R1_CURRENT_STATE(status) == R1_STATE_DATA ||
744 R1_CURRENT_STATE(status) == R1_STATE_RCV) {
745 err = send_stop(card, &stop_status);
747 pr_err("%s: error %d sending stop command\n",
748 req->rq_disk->disk_name, err);
751 * If the stop cmd also timed out, the card is probably
752 * not present, so abort. Other errors are bad news too.
756 if (stop_status & R1_CARD_ECC_FAILED)
760 /* Check for set block count errors */
762 return mmc_blk_cmd_error(req, "SET_BLOCK_COUNT", brq->sbc.error,
763 prev_cmd_status_valid, status);
765 /* Check for r/w command errors */
767 return mmc_blk_cmd_error(req, "r/w cmd", brq->cmd.error,
768 prev_cmd_status_valid, status);
771 if (!brq->stop.error)
774 /* Now for stop errors. These aren't fatal to the transfer. */
775 pr_err("%s: error %d sending stop command, original cmd response %#x, card status %#x\n",
776 req->rq_disk->disk_name, brq->stop.error,
777 brq->cmd.resp[0], status);
780 * Subsitute in our own stop status as this will give the error
781 * state which happened during the execution of the r/w command.
784 brq->stop.resp[0] = stop_status;
790 static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
795 if (md->reset_done & type)
798 md->reset_done |= type;
799 err = mmc_hw_reset(host);
800 /* Ensure we switch back to the correct partition */
801 if (err != -EOPNOTSUPP) {
802 struct mmc_blk_data *main_md = mmc_get_drvdata(host->card);
805 main_md->part_curr = main_md->part_type;
806 part_err = mmc_blk_part_switch(host->card, md);
809 * We have failed to get back into the correct
810 * partition, so we need to abort the whole request.
818 static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
820 md->reset_done &= ~type;
823 static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
825 struct mmc_blk_data *md = mq->data;
826 struct mmc_card *card = md->queue.card;
827 unsigned int from, nr, arg;
828 int err = 0, type = MMC_BLK_DISCARD;
830 if (!mmc_can_erase(card)) {
835 from = blk_rq_pos(req);
836 nr = blk_rq_sectors(req);
838 if (mmc_can_discard(card))
839 arg = MMC_DISCARD_ARG;
840 else if (mmc_can_trim(card))
845 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
846 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
847 INAND_CMD38_ARG_EXT_CSD,
848 arg == MMC_TRIM_ARG ?
849 INAND_CMD38_ARG_TRIM :
850 INAND_CMD38_ARG_ERASE,
855 err = mmc_erase(card, from, nr, arg);
857 if (err == -EIO && !mmc_blk_reset(md, card->host, type))
860 mmc_blk_reset_success(md, type);
861 spin_lock_irq(&md->lock);
862 __blk_end_request(req, err, blk_rq_bytes(req));
863 spin_unlock_irq(&md->lock);
868 static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
871 struct mmc_blk_data *md = mq->data;
872 struct mmc_card *card = md->queue.card;
873 unsigned int from, nr, arg;
874 int err = 0, type = MMC_BLK_SECDISCARD;
876 if (!(mmc_can_secure_erase_trim(card) || mmc_can_sanitize(card))) {
881 /* The sanitize operation is supported at v4.5 only */
882 if (mmc_can_sanitize(card)) {
883 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
884 EXT_CSD_SANITIZE_START, 1, 0);
888 from = blk_rq_pos(req);
889 nr = blk_rq_sectors(req);
891 if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
892 arg = MMC_SECURE_TRIM1_ARG;
894 arg = MMC_SECURE_ERASE_ARG;
896 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
897 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
898 INAND_CMD38_ARG_EXT_CSD,
899 arg == MMC_SECURE_TRIM1_ARG ?
900 INAND_CMD38_ARG_SECTRIM1 :
901 INAND_CMD38_ARG_SECERASE,
906 err = mmc_erase(card, from, nr, arg);
907 if (!err && arg == MMC_SECURE_TRIM1_ARG) {
908 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
909 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
910 INAND_CMD38_ARG_EXT_CSD,
911 INAND_CMD38_ARG_SECTRIM2,
916 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
919 if (err == -EIO && !mmc_blk_reset(md, card->host, type))
922 mmc_blk_reset_success(md, type);
923 spin_lock_irq(&md->lock);
924 __blk_end_request(req, err, blk_rq_bytes(req));
925 spin_unlock_irq(&md->lock);
930 static int mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
932 struct mmc_blk_data *md = mq->data;
933 struct mmc_card *card = md->queue.card;
936 ret = mmc_flush_cache(card);
940 spin_lock_irq(&md->lock);
941 __blk_end_request_all(req, ret);
942 spin_unlock_irq(&md->lock);
948 * Reformat current write as a reliable write, supporting
949 * both legacy and the enhanced reliable write MMC cards.
950 * In each transfer we'll handle only as much as a single
951 * reliable write can handle, thus finish the request in
952 * partial completions.
954 static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
955 struct mmc_card *card,
958 if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
959 /* Legacy mode imposes restrictions on transfers. */
960 if (!IS_ALIGNED(brq->cmd.arg, card->ext_csd.rel_sectors))
961 brq->data.blocks = 1;
963 if (brq->data.blocks > card->ext_csd.rel_sectors)
964 brq->data.blocks = card->ext_csd.rel_sectors;
965 else if (brq->data.blocks < card->ext_csd.rel_sectors)
966 brq->data.blocks = 1;
971 (R1_OUT_OF_RANGE | /* Command argument out of range */ \
972 R1_ADDRESS_ERROR | /* Misaligned address */ \
973 R1_BLOCK_LEN_ERROR | /* Transferred block length incorrect */\
974 R1_WP_VIOLATION | /* Tried to write to protected block */ \
975 R1_CC_ERROR | /* Card controller error */ \
976 R1_ERROR) /* General/unknown error */
978 static int mmc_blk_err_check(struct mmc_card *card,
979 struct mmc_async_req *areq)
981 struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
983 struct mmc_blk_request *brq = &mq_mrq->brq;
984 struct request *req = mq_mrq->req;
988 * sbc.error indicates a problem with the set block count
989 * command. No data will have been transferred.
991 * cmd.error indicates a problem with the r/w command. No
992 * data will have been transferred.
994 * stop.error indicates a problem with the stop command. Data
995 * may have been transferred, or may still be transferring.
997 if (brq->sbc.error || brq->cmd.error || brq->stop.error ||
999 switch (mmc_blk_cmd_recovery(card, req, brq, &ecc_err)) {
1001 return MMC_BLK_RETRY;
1003 return MMC_BLK_ABORT;
1005 return MMC_BLK_NOMEDIUM;
1012 * Check for errors relating to the execution of the
1013 * initial command - such as address errors. No data
1014 * has been transferred.
1016 if (brq->cmd.resp[0] & CMD_ERRORS) {
1017 pr_err("%s: r/w command failed, status = %#x\n",
1018 req->rq_disk->disk_name, brq->cmd.resp[0]);
1019 return MMC_BLK_ABORT;
1023 * Everything else is either success, or a data error of some
1024 * kind. If it was a write, we may have transitioned to
1025 * program mode, which we have to wait for it to complete.
1027 if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
1030 int err = get_card_status(card, &status, 5);
1032 pr_err("%s: error %d requesting status\n",
1033 req->rq_disk->disk_name, err);
1034 return MMC_BLK_CMD_ERR;
1037 * Some cards mishandle the status bits,
1038 * so make sure to check both the busy
1039 * indication and the card state.
1041 } while (!(status & R1_READY_FOR_DATA) ||
1042 (R1_CURRENT_STATE(status) == R1_STATE_PRG));
1045 if (brq->data.error) {
1046 pr_err("%s: error %d transferring data, sector %u, nr %u, cmd response %#x, card status %#x\n",
1047 req->rq_disk->disk_name, brq->data.error,
1048 (unsigned)blk_rq_pos(req),
1049 (unsigned)blk_rq_sectors(req),
1050 brq->cmd.resp[0], brq->stop.resp[0]);
1052 if (rq_data_dir(req) == READ) {
1054 return MMC_BLK_ECC_ERR;
1055 return MMC_BLK_DATA_ERR;
1057 return MMC_BLK_CMD_ERR;
1061 if (!brq->data.bytes_xfered)
1062 return MMC_BLK_RETRY;
1064 if (blk_rq_bytes(req) != brq->data.bytes_xfered)
1065 return MMC_BLK_PARTIAL;
1067 return MMC_BLK_SUCCESS;
1070 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
1071 struct mmc_card *card,
1073 struct mmc_queue *mq)
1075 u32 readcmd, writecmd;
1076 struct mmc_blk_request *brq = &mqrq->brq;
1077 struct request *req = mqrq->req;
1078 struct mmc_blk_data *md = mq->data;
1081 * Reliable writes are used to implement Forced Unit Access and
1082 * REQ_META accesses, and are supported only on MMCs.
1084 * XXX: this really needs a good explanation of why REQ_META
1085 * is treated special.
1087 bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
1088 (req->cmd_flags & REQ_META)) &&
1089 (rq_data_dir(req) == WRITE) &&
1090 (md->flags & MMC_BLK_REL_WR);
1092 memset(brq, 0, sizeof(struct mmc_blk_request));
1093 brq->mrq.cmd = &brq->cmd;
1094 brq->mrq.data = &brq->data;
1096 brq->cmd.arg = blk_rq_pos(req);
1097 if (!mmc_card_blockaddr(card))
1099 brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1100 brq->data.blksz = 512;
1101 brq->stop.opcode = MMC_STOP_TRANSMISSION;
1103 brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1104 brq->data.blocks = blk_rq_sectors(req);
1107 * The block layer doesn't support all sector count
1108 * restrictions, so we need to be prepared for too big
1111 if (brq->data.blocks > card->host->max_blk_count)
1112 brq->data.blocks = card->host->max_blk_count;
1114 if (brq->data.blocks > 1) {
1116 * After a read error, we redo the request one sector
1117 * at a time in order to accurately determine which
1118 * sectors can be read successfully.
1121 brq->data.blocks = 1;
1123 /* Some controllers can't do multiblock reads due to hw bugs */
1124 if (card->host->caps2 & MMC_CAP2_NO_MULTI_READ &&
1125 rq_data_dir(req) == READ)
1126 brq->data.blocks = 1;
1129 if (brq->data.blocks > 1 || do_rel_wr) {
1130 /* SPI multiblock writes terminate using a special
1131 * token, not a STOP_TRANSMISSION request.
1133 if (!mmc_host_is_spi(card->host) ||
1134 rq_data_dir(req) == READ)
1135 brq->mrq.stop = &brq->stop;
1136 readcmd = MMC_READ_MULTIPLE_BLOCK;
1137 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1139 brq->mrq.stop = NULL;
1140 readcmd = MMC_READ_SINGLE_BLOCK;
1141 writecmd = MMC_WRITE_BLOCK;
1143 if (rq_data_dir(req) == READ) {
1144 brq->cmd.opcode = readcmd;
1145 brq->data.flags |= MMC_DATA_READ;
1147 brq->cmd.opcode = writecmd;
1148 brq->data.flags |= MMC_DATA_WRITE;
1152 mmc_apply_rel_rw(brq, card, req);
1155 * Pre-defined multi-block transfers are preferable to
1156 * open ended-ones (and necessary for reliable writes).
1157 * However, it is not sufficient to just send CMD23,
1158 * and avoid the final CMD12, as on an error condition
1159 * CMD12 (stop) needs to be sent anyway. This, coupled
1160 * with Auto-CMD23 enhancements provided by some
1161 * hosts, means that the complexity of dealing
1162 * with this is best left to the host. If CMD23 is
1163 * supported by card and host, we'll fill sbc in and let
1164 * the host deal with handling it correctly. This means
1165 * that for hosts that don't expose MMC_CAP_CMD23, no
1166 * change of behavior will be observed.
1168 * N.B: Some MMC cards experience perf degradation.
1169 * We'll avoid using CMD23-bounded multiblock writes for
1170 * these, while retaining features like reliable writes.
1173 if ((md->flags & MMC_BLK_CMD23) &&
1174 mmc_op_multi(brq->cmd.opcode) &&
1175 (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23))) {
1176 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1177 brq->sbc.arg = brq->data.blocks |
1178 (do_rel_wr ? (1 << 31) : 0);
1179 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1180 brq->mrq.sbc = &brq->sbc;
1183 mmc_set_data_timeout(&brq->data, card);
1185 brq->data.sg = mqrq->sg;
1186 brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1189 * Adjust the sg list so it is the same size as the
1192 if (brq->data.blocks != blk_rq_sectors(req)) {
1193 int i, data_size = brq->data.blocks << 9;
1194 struct scatterlist *sg;
1196 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1197 data_size -= sg->length;
1198 if (data_size <= 0) {
1199 sg->length += data_size;
1204 brq->data.sg_len = i;
1207 mqrq->mmc_active.mrq = &brq->mrq;
1208 mqrq->mmc_active.err_check = mmc_blk_err_check;
1210 mmc_queue_bounce_pre(mqrq);
1213 static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
1214 struct mmc_blk_request *brq, struct request *req,
1218 * If this is an SD card and we're writing, we can first
1219 * mark the known good sectors as ok.
1221 * If the card is not SD, we can still ok written sectors
1222 * as reported by the controller (which might be less than
1223 * the real number of written sectors, but never more).
1225 if (mmc_card_sd(card)) {
1228 blocks = mmc_sd_num_wr_blocks(card);
1229 if (blocks != (u32)-1) {
1230 spin_lock_irq(&md->lock);
1231 ret = __blk_end_request(req, 0, blocks << 9);
1232 spin_unlock_irq(&md->lock);
1235 spin_lock_irq(&md->lock);
1236 ret = __blk_end_request(req, 0, brq->data.bytes_xfered);
1237 spin_unlock_irq(&md->lock);
1242 static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
1244 struct mmc_blk_data *md = mq->data;
1245 struct mmc_card *card = md->queue.card;
1246 struct mmc_blk_request *brq = &mq->mqrq_cur->brq;
1247 int ret = 1, disable_multi = 0, retry = 0, type;
1248 enum mmc_blk_status status;
1249 struct mmc_queue_req *mq_rq;
1250 struct request *req;
1251 struct mmc_async_req *areq;
1253 if (!rqc && !mq->mqrq_prev->req)
1258 mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1259 areq = &mq->mqrq_cur->mmc_active;
1262 areq = mmc_start_req(card->host, areq, (int *) &status);
1266 mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
1269 type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1270 mmc_queue_bounce_post(mq_rq);
1273 case MMC_BLK_SUCCESS:
1274 case MMC_BLK_PARTIAL:
1276 * A block was successfully transferred.
1278 mmc_blk_reset_success(md, type);
1279 spin_lock_irq(&md->lock);
1280 ret = __blk_end_request(req, 0,
1281 brq->data.bytes_xfered);
1282 spin_unlock_irq(&md->lock);
1284 * If the blk_end_request function returns non-zero even
1285 * though all data has been transferred and no errors
1286 * were returned by the host controller, it's a bug.
1288 if (status == MMC_BLK_SUCCESS && ret) {
1289 pr_err("%s BUG rq_tot %d d_xfer %d\n",
1290 __func__, blk_rq_bytes(req),
1291 brq->data.bytes_xfered);
1296 case MMC_BLK_CMD_ERR:
1297 ret = mmc_blk_cmd_err(md, card, brq, req, ret);
1298 if (!mmc_blk_reset(md, card->host, type))
1306 if (!mmc_blk_reset(md, card->host, type))
1309 case MMC_BLK_DATA_ERR: {
1312 err = mmc_blk_reset(md, card->host, type);
1319 case MMC_BLK_ECC_ERR:
1320 if (brq->data.blocks > 1) {
1321 /* Redo read one sector at a time */
1322 pr_warning("%s: retrying using single block read\n",
1323 req->rq_disk->disk_name);
1328 * After an error, we redo I/O one sector at a
1329 * time, so we only reach here after trying to
1330 * read a single sector.
1332 spin_lock_irq(&md->lock);
1333 ret = __blk_end_request(req, -EIO,
1335 spin_unlock_irq(&md->lock);
1339 case MMC_BLK_NOMEDIUM:
1345 * In case of a incomplete request
1346 * prepare it again and resend.
1348 mmc_blk_rw_rq_prep(mq_rq, card, disable_multi, mq);
1349 mmc_start_req(card->host, &mq_rq->mmc_active, NULL);
1356 spin_lock_irq(&md->lock);
1357 if (mmc_card_removed(card))
1358 req->cmd_flags |= REQ_QUIET;
1360 ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req));
1361 spin_unlock_irq(&md->lock);
1365 mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1366 mmc_start_req(card->host, &mq->mqrq_cur->mmc_active, NULL);
1372 static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
1375 struct mmc_blk_data *md = mq->data;
1376 struct mmc_card *card = md->queue.card;
1378 if (req && !mq->mqrq_prev->req)
1379 /* claim host only for the first request */
1380 mmc_claim_host(card->host);
1382 ret = mmc_blk_part_switch(card, md);
1385 spin_lock_irq(&md->lock);
1386 __blk_end_request_all(req, -EIO);
1387 spin_unlock_irq(&md->lock);
1393 if (req && req->cmd_flags & REQ_DISCARD) {
1394 /* complete ongoing async transfer before issuing discard */
1395 if (card->host->areq)
1396 mmc_blk_issue_rw_rq(mq, NULL);
1397 if (req->cmd_flags & REQ_SECURE)
1398 ret = mmc_blk_issue_secdiscard_rq(mq, req);
1400 ret = mmc_blk_issue_discard_rq(mq, req);
1401 } else if (req && req->cmd_flags & REQ_FLUSH) {
1402 /* complete ongoing async transfer before issuing flush */
1403 if (card->host->areq)
1404 mmc_blk_issue_rw_rq(mq, NULL);
1405 ret = mmc_blk_issue_flush(mq, req);
1407 ret = mmc_blk_issue_rw_rq(mq, req);
1412 /* release host only when there are no more requests */
1413 mmc_release_host(card->host);
1417 static inline int mmc_blk_readonly(struct mmc_card *card)
1419 return mmc_card_readonly(card) ||
1420 !(card->csd.cmdclass & CCC_BLOCK_WRITE);
1423 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
1424 struct device *parent,
1427 const char *subname,
1430 struct mmc_blk_data *md;
1433 devidx = find_first_zero_bit(dev_use, max_devices);
1434 if (devidx >= max_devices)
1435 return ERR_PTR(-ENOSPC);
1436 __set_bit(devidx, dev_use);
1438 md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
1445 * !subname implies we are creating main mmc_blk_data that will be
1446 * associated with mmc_card with mmc_set_drvdata. Due to device
1447 * partitions, devidx will not coincide with a per-physical card
1448 * index anymore so we keep track of a name index.
1451 md->name_idx = find_first_zero_bit(name_use, max_devices);
1452 __set_bit(md->name_idx, name_use);
1454 md->name_idx = ((struct mmc_blk_data *)
1455 dev_to_disk(parent)->private_data)->name_idx;
1457 md->area_type = area_type;
1460 * Set the read-only status based on the supported commands
1461 * and the write protect switch.
1463 md->read_only = mmc_blk_readonly(card);
1465 md->disk = alloc_disk(perdev_minors);
1466 if (md->disk == NULL) {
1471 spin_lock_init(&md->lock);
1472 INIT_LIST_HEAD(&md->part);
1475 ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
1479 md->queue.issue_fn = mmc_blk_issue_rq;
1480 md->queue.data = md;
1482 md->disk->major = MMC_BLOCK_MAJOR;
1483 md->disk->first_minor = devidx * perdev_minors;
1484 md->disk->fops = &mmc_bdops;
1485 md->disk->private_data = md;
1486 md->disk->queue = md->queue.queue;
1487 md->disk->driverfs_dev = parent;
1488 set_disk_ro(md->disk, md->read_only || default_ro);
1489 md->disk->flags = GENHD_FL_EXT_DEVT;
1492 * As discussed on lkml, GENHD_FL_REMOVABLE should:
1494 * - be set for removable media with permanent block devices
1495 * - be unset for removable block devices with permanent media
1497 * Since MMC block devices clearly fall under the second
1498 * case, we do not set GENHD_FL_REMOVABLE. Userspace
1499 * should use the block device creation/destruction hotplug
1500 * messages to tell when the card is present.
1503 snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
1504 "mmcblk%d%s", md->name_idx, subname ? subname : "");
1506 blk_queue_logical_block_size(md->queue.queue, 512);
1507 set_capacity(md->disk, size);
1509 if (mmc_host_cmd23(card->host)) {
1510 if (mmc_card_mmc(card) ||
1511 (mmc_card_sd(card) &&
1512 card->scr.cmds & SD_SCR_CMD23_SUPPORT))
1513 md->flags |= MMC_BLK_CMD23;
1516 if (mmc_card_mmc(card) &&
1517 md->flags & MMC_BLK_CMD23 &&
1518 ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
1519 card->ext_csd.rel_sectors)) {
1520 md->flags |= MMC_BLK_REL_WR;
1521 blk_queue_flush(md->queue.queue, REQ_FLUSH | REQ_FUA);
1531 return ERR_PTR(ret);
1534 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
1537 struct mmc_blk_data *md;
1539 if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
1541 * The EXT_CSD sector count is in number or 512 byte
1544 size = card->ext_csd.sectors;
1547 * The CSD capacity field is in units of read_blkbits.
1548 * set_capacity takes units of 512 bytes.
1550 size = card->csd.capacity << (card->csd.read_blkbits - 9);
1553 md = mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
1554 MMC_BLK_DATA_AREA_MAIN);
1558 static int mmc_blk_alloc_part(struct mmc_card *card,
1559 struct mmc_blk_data *md,
1560 unsigned int part_type,
1563 const char *subname,
1567 struct mmc_blk_data *part_md;
1569 part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
1570 subname, area_type);
1571 if (IS_ERR(part_md))
1572 return PTR_ERR(part_md);
1573 part_md->part_type = part_type;
1574 list_add(&part_md->part, &md->part);
1576 string_get_size((u64)get_capacity(part_md->disk) << 9, STRING_UNITS_2,
1577 cap_str, sizeof(cap_str));
1578 pr_info("%s: %s %s partition %u %s\n",
1579 part_md->disk->disk_name, mmc_card_id(card),
1580 mmc_card_name(card), part_md->part_type, cap_str);
1584 /* MMC Physical partitions consist of two boot partitions and
1585 * up to four general purpose partitions.
1586 * For each partition enabled in EXT_CSD a block device will be allocatedi
1587 * to provide access to the partition.
1590 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
1594 if (!mmc_card_mmc(card))
1597 for (idx = 0; idx < card->nr_parts; idx++) {
1598 if (card->part[idx].size) {
1599 ret = mmc_blk_alloc_part(card, md,
1600 card->part[idx].part_cfg,
1601 card->part[idx].size >> 9,
1602 card->part[idx].force_ro,
1603 card->part[idx].name,
1604 card->part[idx].area_type);
1614 mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card)
1618 mmc_claim_host(card->host);
1619 err = mmc_set_blocklen(card, 512);
1620 mmc_release_host(card->host);
1623 pr_err("%s: unable to set block size to 512: %d\n",
1624 md->disk->disk_name, err);
1631 static void mmc_blk_remove_req(struct mmc_blk_data *md)
1633 struct mmc_card *card;
1636 card = md->queue.card;
1637 if (md->disk->flags & GENHD_FL_UP) {
1638 device_remove_file(disk_to_dev(md->disk), &md->force_ro);
1639 if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
1640 card->ext_csd.boot_ro_lockable)
1641 device_remove_file(disk_to_dev(md->disk),
1642 &md->power_ro_lock);
1644 /* Stop new requests from getting into the queue */
1645 del_gendisk(md->disk);
1648 /* Then flush out any already in there */
1649 mmc_cleanup_queue(&md->queue);
1654 static void mmc_blk_remove_parts(struct mmc_card *card,
1655 struct mmc_blk_data *md)
1657 struct list_head *pos, *q;
1658 struct mmc_blk_data *part_md;
1660 __clear_bit(md->name_idx, name_use);
1661 list_for_each_safe(pos, q, &md->part) {
1662 part_md = list_entry(pos, struct mmc_blk_data, part);
1664 mmc_blk_remove_req(part_md);
1668 static int mmc_add_disk(struct mmc_blk_data *md)
1671 struct mmc_card *card = md->queue.card;
1674 md->force_ro.show = force_ro_show;
1675 md->force_ro.store = force_ro_store;
1676 sysfs_attr_init(&md->force_ro.attr);
1677 md->force_ro.attr.name = "force_ro";
1678 md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
1679 ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
1683 if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
1684 card->ext_csd.boot_ro_lockable) {
1687 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS)
1690 mode = S_IRUGO | S_IWUSR;
1692 md->power_ro_lock.show = power_ro_lock_show;
1693 md->power_ro_lock.store = power_ro_lock_store;
1694 md->power_ro_lock.attr.mode = mode;
1695 md->power_ro_lock.attr.name =
1696 "ro_lock_until_next_power_on";
1697 ret = device_create_file(disk_to_dev(md->disk),
1698 &md->power_ro_lock);
1700 goto power_ro_lock_fail;
1705 device_remove_file(disk_to_dev(md->disk), &md->force_ro);
1707 del_gendisk(md->disk);
1712 #define CID_MANFID_SANDISK 0x2
1713 #define CID_MANFID_TOSHIBA 0x11
1714 #define CID_MANFID_MICRON 0x13
1716 static const struct mmc_fixup blk_fixups[] =
1718 MMC_FIXUP("SEM02G", CID_MANFID_SANDISK, 0x100, add_quirk,
1719 MMC_QUIRK_INAND_CMD38),
1720 MMC_FIXUP("SEM04G", CID_MANFID_SANDISK, 0x100, add_quirk,
1721 MMC_QUIRK_INAND_CMD38),
1722 MMC_FIXUP("SEM08G", CID_MANFID_SANDISK, 0x100, add_quirk,
1723 MMC_QUIRK_INAND_CMD38),
1724 MMC_FIXUP("SEM16G", CID_MANFID_SANDISK, 0x100, add_quirk,
1725 MMC_QUIRK_INAND_CMD38),
1726 MMC_FIXUP("SEM32G", CID_MANFID_SANDISK, 0x100, add_quirk,
1727 MMC_QUIRK_INAND_CMD38),
1730 * Some MMC cards experience performance degradation with CMD23
1731 * instead of CMD12-bounded multiblock transfers. For now we'll
1732 * black list what's bad...
1733 * - Certain Toshiba cards.
1735 * N.B. This doesn't affect SD cards.
1737 MMC_FIXUP("MMC08G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
1738 MMC_QUIRK_BLK_NO_CMD23),
1739 MMC_FIXUP("MMC16G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
1740 MMC_QUIRK_BLK_NO_CMD23),
1741 MMC_FIXUP("MMC32G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
1742 MMC_QUIRK_BLK_NO_CMD23),
1745 * Some Micron MMC cards needs longer data read timeout than
1748 MMC_FIXUP(CID_NAME_ANY, CID_MANFID_MICRON, 0x200, add_quirk_mmc,
1749 MMC_QUIRK_LONG_READ_TIME),
1754 static int mmc_blk_probe(struct mmc_card *card)
1756 struct mmc_blk_data *md, *part_md;
1761 * Check that the card supports the command class(es) we need.
1763 if (!(card->csd.cmdclass & CCC_BLOCK_READ))
1766 md = mmc_blk_alloc(card);
1770 err = mmc_blk_set_blksize(md, card);
1774 string_get_size((u64)get_capacity(md->disk) << 9, STRING_UNITS_2,
1775 cap_str, sizeof(cap_str));
1776 pr_info("%s: %s %s %s %s\n",
1777 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
1778 cap_str, md->read_only ? "(ro)" : "");
1780 if (mmc_blk_alloc_parts(card, md))
1783 mmc_set_drvdata(card, md);
1784 mmc_fixup_device(card, blk_fixups);
1786 if (mmc_add_disk(md))
1789 list_for_each_entry(part_md, &md->part, part) {
1790 if (mmc_add_disk(part_md))
1796 mmc_blk_remove_parts(card, md);
1797 mmc_blk_remove_req(md);
1801 static void mmc_blk_remove(struct mmc_card *card)
1803 struct mmc_blk_data *md = mmc_get_drvdata(card);
1805 mmc_blk_remove_parts(card, md);
1806 mmc_claim_host(card->host);
1807 mmc_blk_part_switch(card, md);
1808 mmc_release_host(card->host);
1809 mmc_blk_remove_req(md);
1810 mmc_set_drvdata(card, NULL);
1814 static int mmc_blk_suspend(struct mmc_card *card, pm_message_t state)
1816 struct mmc_blk_data *part_md;
1817 struct mmc_blk_data *md = mmc_get_drvdata(card);
1820 mmc_queue_suspend(&md->queue);
1821 list_for_each_entry(part_md, &md->part, part) {
1822 mmc_queue_suspend(&part_md->queue);
1828 static int mmc_blk_resume(struct mmc_card *card)
1830 struct mmc_blk_data *part_md;
1831 struct mmc_blk_data *md = mmc_get_drvdata(card);
1834 mmc_blk_set_blksize(md, card);
1837 * Resume involves the card going into idle state,
1838 * so current partition is always the main one.
1840 md->part_curr = md->part_type;
1841 mmc_queue_resume(&md->queue);
1842 list_for_each_entry(part_md, &md->part, part) {
1843 mmc_queue_resume(&part_md->queue);
1849 #define mmc_blk_suspend NULL
1850 #define mmc_blk_resume NULL
1853 static struct mmc_driver mmc_driver = {
1857 .probe = mmc_blk_probe,
1858 .remove = mmc_blk_remove,
1859 .suspend = mmc_blk_suspend,
1860 .resume = mmc_blk_resume,
1863 static int __init mmc_blk_init(void)
1867 if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
1868 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
1870 max_devices = 256 / perdev_minors;
1872 res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
1876 res = mmc_register_driver(&mmc_driver);
1882 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
1887 static void __exit mmc_blk_exit(void)
1889 mmc_unregister_driver(&mmc_driver);
1890 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
1893 module_init(mmc_blk_init);
1894 module_exit(mmc_blk_exit);
1896 MODULE_LICENSE("GPL");
1897 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");