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 devmaj = MAJOR(disk_devt(disk));
148 int devidx = MINOR(disk_devt(disk)) / perdev_minors;
151 devidx = disk->first_minor / perdev_minors;
155 static void mmc_blk_put(struct mmc_blk_data *md)
157 mutex_lock(&open_lock);
159 if (md->usage == 0) {
160 int devidx = mmc_get_devidx(md->disk);
161 blk_cleanup_queue(md->queue.queue);
163 __clear_bit(devidx, dev_use);
168 mutex_unlock(&open_lock);
171 static ssize_t power_ro_lock_show(struct device *dev,
172 struct device_attribute *attr, char *buf)
175 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
176 struct mmc_card *card = md->queue.card;
179 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PERM_WP_EN)
181 else if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_EN)
184 ret = snprintf(buf, PAGE_SIZE, "%d\n", locked);
189 static ssize_t power_ro_lock_store(struct device *dev,
190 struct device_attribute *attr, const char *buf, size_t count)
193 struct mmc_blk_data *md, *part_md;
194 struct mmc_card *card;
197 if (kstrtoul(buf, 0, &set))
203 md = mmc_blk_get(dev_to_disk(dev));
204 card = md->queue.card;
206 mmc_claim_host(card->host);
208 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP,
209 card->ext_csd.boot_ro_lock |
210 EXT_CSD_BOOT_WP_B_PWR_WP_EN,
211 card->ext_csd.part_time);
213 pr_err("%s: Locking boot partition ro until next power on failed: %d\n", md->disk->disk_name, ret);
215 card->ext_csd.boot_ro_lock |= EXT_CSD_BOOT_WP_B_PWR_WP_EN;
217 mmc_release_host(card->host);
220 pr_info("%s: Locking boot partition ro until next power on\n",
221 md->disk->disk_name);
222 set_disk_ro(md->disk, 1);
224 list_for_each_entry(part_md, &md->part, part)
225 if (part_md->area_type == MMC_BLK_DATA_AREA_BOOT) {
226 pr_info("%s: Locking boot partition ro until next power on\n", part_md->disk->disk_name);
227 set_disk_ro(part_md->disk, 1);
235 static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
239 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
241 ret = snprintf(buf, PAGE_SIZE, "%d",
242 get_disk_ro(dev_to_disk(dev)) ^
248 static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
249 const char *buf, size_t count)
253 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
254 unsigned long set = simple_strtoul(buf, &end, 0);
260 set_disk_ro(dev_to_disk(dev), set || md->read_only);
267 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
269 struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
272 mutex_lock(&block_mutex);
275 check_disk_change(bdev);
278 if ((mode & FMODE_WRITE) && md->read_only) {
283 mutex_unlock(&block_mutex);
288 static int mmc_blk_release(struct gendisk *disk, fmode_t mode)
290 struct mmc_blk_data *md = disk->private_data;
292 mutex_lock(&block_mutex);
294 mutex_unlock(&block_mutex);
299 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
301 geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
307 struct mmc_blk_ioc_data {
308 struct mmc_ioc_cmd ic;
313 static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
314 struct mmc_ioc_cmd __user *user)
316 struct mmc_blk_ioc_data *idata;
319 idata = kzalloc(sizeof(*idata), GFP_KERNEL);
325 if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
330 idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
331 if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
336 if (!idata->buf_bytes)
339 idata->buf = kzalloc(idata->buf_bytes, GFP_KERNEL);
345 if (copy_from_user(idata->buf, (void __user *)(unsigned long)
346 idata->ic.data_ptr, idata->buf_bytes)) {
361 static int mmc_blk_ioctl_cmd(struct block_device *bdev,
362 struct mmc_ioc_cmd __user *ic_ptr)
364 struct mmc_blk_ioc_data *idata;
365 struct mmc_blk_data *md;
366 struct mmc_card *card;
367 struct mmc_command cmd = {0};
368 struct mmc_data data = {0};
369 struct mmc_request mrq = {NULL};
370 struct scatterlist sg;
374 * The caller must have CAP_SYS_RAWIO, and must be calling this on the
375 * whole block device, not on a partition. This prevents overspray
376 * between sibling partitions.
378 if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
381 idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
383 return PTR_ERR(idata);
385 md = mmc_blk_get(bdev->bd_disk);
391 card = md->queue.card;
397 cmd.opcode = idata->ic.opcode;
398 cmd.arg = idata->ic.arg;
399 cmd.flags = idata->ic.flags;
401 if (idata->buf_bytes) {
404 data.blksz = idata->ic.blksz;
405 data.blocks = idata->ic.blocks;
407 sg_init_one(data.sg, idata->buf, idata->buf_bytes);
409 if (idata->ic.write_flag)
410 data.flags = MMC_DATA_WRITE;
412 data.flags = MMC_DATA_READ;
414 /* data.flags must already be set before doing this. */
415 mmc_set_data_timeout(&data, card);
417 /* Allow overriding the timeout_ns for empirical tuning. */
418 if (idata->ic.data_timeout_ns)
419 data.timeout_ns = idata->ic.data_timeout_ns;
421 if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
423 * Pretend this is a data transfer and rely on the
424 * host driver to compute timeout. When all host
425 * drivers support cmd.cmd_timeout for R1B, this
429 * cmd.cmd_timeout = idata->ic.cmd_timeout_ms;
431 data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000;
439 mmc_claim_host(card->host);
441 if (idata->ic.is_acmd) {
442 err = mmc_app_cmd(card->host, card);
447 mmc_wait_for_req(card->host, &mrq);
450 dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
451 __func__, cmd.error);
456 dev_err(mmc_dev(card->host), "%s: data error %d\n",
457 __func__, data.error);
463 * According to the SD specs, some commands require a delay after
464 * issuing the command.
466 if (idata->ic.postsleep_min_us)
467 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
469 if (copy_to_user(&(ic_ptr->response), cmd.resp, sizeof(cmd.resp))) {
474 if (!idata->ic.write_flag) {
475 if (copy_to_user((void __user *)(unsigned long) idata->ic.data_ptr,
476 idata->buf, idata->buf_bytes)) {
483 mmc_release_host(card->host);
492 static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
493 unsigned int cmd, unsigned long arg)
496 if (cmd == MMC_IOC_CMD)
497 ret = mmc_blk_ioctl_cmd(bdev, (struct mmc_ioc_cmd __user *)arg);
502 static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
503 unsigned int cmd, unsigned long arg)
505 return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
509 static const struct block_device_operations mmc_bdops = {
510 .open = mmc_blk_open,
511 .release = mmc_blk_release,
512 .getgeo = mmc_blk_getgeo,
513 .owner = THIS_MODULE,
514 .ioctl = mmc_blk_ioctl,
516 .compat_ioctl = mmc_blk_compat_ioctl,
520 static inline int mmc_blk_part_switch(struct mmc_card *card,
521 struct mmc_blk_data *md)
524 struct mmc_blk_data *main_md = mmc_get_drvdata(card);
526 if (main_md->part_curr == md->part_type)
529 if (mmc_card_mmc(card)) {
530 u8 part_config = card->ext_csd.part_config;
532 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
533 part_config |= md->part_type;
535 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
536 EXT_CSD_PART_CONFIG, part_config,
537 card->ext_csd.part_time);
541 card->ext_csd.part_config = part_config;
544 main_md->part_curr = md->part_type;
548 static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
554 struct mmc_request mrq = {NULL};
555 struct mmc_command cmd = {0};
556 struct mmc_data data = {0};
557 unsigned int timeout_us;
559 struct scatterlist sg;
561 cmd.opcode = MMC_APP_CMD;
562 cmd.arg = card->rca << 16;
563 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
565 err = mmc_wait_for_cmd(card->host, &cmd, 0);
568 if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
571 memset(&cmd, 0, sizeof(struct mmc_command));
573 cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
575 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
577 data.timeout_ns = card->csd.tacc_ns * 100;
578 data.timeout_clks = card->csd.tacc_clks * 100;
580 timeout_us = data.timeout_ns / 1000;
581 timeout_us += data.timeout_clks * 1000 /
582 (card->host->ios.clock / 1000);
584 if (timeout_us > 100000) {
585 data.timeout_ns = 100000000;
586 data.timeout_clks = 0;
591 data.flags = MMC_DATA_READ;
598 blocks = kmalloc(4, GFP_KERNEL);
602 sg_init_one(&sg, blocks, 4);
604 mmc_wait_for_req(card->host, &mrq);
606 result = ntohl(*blocks);
609 if (cmd.error || data.error)
615 static int send_stop(struct mmc_card *card, u32 *status)
617 struct mmc_command cmd = {0};
620 cmd.opcode = MMC_STOP_TRANSMISSION;
621 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
622 err = mmc_wait_for_cmd(card->host, &cmd, 5);
624 *status = cmd.resp[0];
628 static int get_card_status(struct mmc_card *card, u32 *status, int retries)
630 struct mmc_command cmd = {0};
633 cmd.opcode = MMC_SEND_STATUS;
634 if (!mmc_host_is_spi(card->host))
635 cmd.arg = card->rca << 16;
636 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
637 err = mmc_wait_for_cmd(card->host, &cmd, retries);
639 *status = cmd.resp[0];
643 #define ERR_NOMEDIUM 3
646 #define ERR_CONTINUE 0
648 static int mmc_blk_cmd_error(struct request *req, const char *name, int error,
649 bool status_valid, u32 status)
653 /* response crc error, retry the r/w cmd */
654 pr_err("%s: %s sending %s command, card status %#x\n",
655 req->rq_disk->disk_name, "response CRC error",
660 pr_err("%s: %s sending %s command, card status %#x\n",
661 req->rq_disk->disk_name, "timed out", name, status);
663 /* If the status cmd initially failed, retry the r/w cmd */
668 * If it was a r/w cmd crc error, or illegal command
669 * (eg, issued in wrong state) then retry - we should
670 * have corrected the state problem above.
672 if (status & (R1_COM_CRC_ERROR | R1_ILLEGAL_COMMAND))
675 /* Otherwise abort the command */
679 /* We don't understand the error code the driver gave us */
680 pr_err("%s: unknown error %d sending read/write command, card status %#x\n",
681 req->rq_disk->disk_name, error, status);
687 * Initial r/w and stop cmd error recovery.
688 * We don't know whether the card received the r/w cmd or not, so try to
689 * restore things back to a sane state. Essentially, we do this as follows:
690 * - Obtain card status. If the first attempt to obtain card status fails,
691 * the status word will reflect the failed status cmd, not the failed
692 * r/w cmd. If we fail to obtain card status, it suggests we can no
693 * longer communicate with the card.
694 * - Check the card state. If the card received the cmd but there was a
695 * transient problem with the response, it might still be in a data transfer
696 * mode. Try to send it a stop command. If this fails, we can't recover.
697 * - If the r/w cmd failed due to a response CRC error, it was probably
698 * transient, so retry the cmd.
699 * - If the r/w cmd timed out, but we didn't get the r/w cmd status, retry.
700 * - If the r/w cmd timed out, and the r/w cmd failed due to CRC error or
701 * illegal cmd, retry.
702 * Otherwise we don't understand what happened, so abort.
704 static int mmc_blk_cmd_recovery(struct mmc_card *card, struct request *req,
705 struct mmc_blk_request *brq, int *ecc_err)
707 bool prev_cmd_status_valid = true;
708 u32 status, stop_status = 0;
711 if (mmc_card_removed(card))
715 * Try to get card status which indicates both the card state
716 * and why there was no response. If the first attempt fails,
717 * we can't be sure the returned status is for the r/w command.
719 for (retry = 2; retry >= 0; retry--) {
720 err = get_card_status(card, &status, 0);
724 prev_cmd_status_valid = false;
725 pr_err("%s: error %d sending status command, %sing\n",
726 req->rq_disk->disk_name, err, retry ? "retry" : "abort");
729 /* We couldn't get a response from the card. Give up. */
731 /* Check if the card is removed */
732 if (mmc_detect_card_removed(card->host))
737 /* Flag ECC errors */
738 if ((status & R1_CARD_ECC_FAILED) ||
739 (brq->stop.resp[0] & R1_CARD_ECC_FAILED) ||
740 (brq->cmd.resp[0] & R1_CARD_ECC_FAILED))
744 * Check the current card state. If it is in some data transfer
745 * mode, tell it to stop (and hopefully transition back to TRAN.)
747 if (R1_CURRENT_STATE(status) == R1_STATE_DATA ||
748 R1_CURRENT_STATE(status) == R1_STATE_RCV) {
749 err = send_stop(card, &stop_status);
751 pr_err("%s: error %d sending stop command\n",
752 req->rq_disk->disk_name, err);
755 * If the stop cmd also timed out, the card is probably
756 * not present, so abort. Other errors are bad news too.
760 if (stop_status & R1_CARD_ECC_FAILED)
764 /* Check for set block count errors */
766 return mmc_blk_cmd_error(req, "SET_BLOCK_COUNT", brq->sbc.error,
767 prev_cmd_status_valid, status);
769 /* Check for r/w command errors */
771 return mmc_blk_cmd_error(req, "r/w cmd", brq->cmd.error,
772 prev_cmd_status_valid, status);
775 if (!brq->stop.error)
778 /* Now for stop errors. These aren't fatal to the transfer. */
779 pr_err("%s: error %d sending stop command, original cmd response %#x, card status %#x\n",
780 req->rq_disk->disk_name, brq->stop.error,
781 brq->cmd.resp[0], status);
784 * Subsitute in our own stop status as this will give the error
785 * state which happened during the execution of the r/w command.
788 brq->stop.resp[0] = stop_status;
794 static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
799 if (md->reset_done & type)
802 md->reset_done |= type;
803 err = mmc_hw_reset(host);
804 /* Ensure we switch back to the correct partition */
805 if (err != -EOPNOTSUPP) {
806 struct mmc_blk_data *main_md = mmc_get_drvdata(host->card);
809 main_md->part_curr = main_md->part_type;
810 part_err = mmc_blk_part_switch(host->card, md);
813 * We have failed to get back into the correct
814 * partition, so we need to abort the whole request.
822 static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
824 md->reset_done &= ~type;
827 static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
829 struct mmc_blk_data *md = mq->data;
830 struct mmc_card *card = md->queue.card;
831 unsigned int from, nr, arg;
832 int err = 0, type = MMC_BLK_DISCARD;
834 if (!mmc_can_erase(card)) {
839 from = blk_rq_pos(req);
840 nr = blk_rq_sectors(req);
842 if (mmc_can_discard(card))
843 arg = MMC_DISCARD_ARG;
844 else if (mmc_can_trim(card))
849 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
850 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
851 INAND_CMD38_ARG_EXT_CSD,
852 arg == MMC_TRIM_ARG ?
853 INAND_CMD38_ARG_TRIM :
854 INAND_CMD38_ARG_ERASE,
859 err = mmc_erase(card, from, nr, arg);
861 if (err == -EIO && !mmc_blk_reset(md, card->host, type))
864 mmc_blk_reset_success(md, type);
865 spin_lock_irq(&md->lock);
866 __blk_end_request(req, err, blk_rq_bytes(req));
867 spin_unlock_irq(&md->lock);
872 static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
875 struct mmc_blk_data *md = mq->data;
876 struct mmc_card *card = md->queue.card;
877 unsigned int from, nr, arg;
878 int err = 0, type = MMC_BLK_SECDISCARD;
880 if (!(mmc_can_secure_erase_trim(card) || mmc_can_sanitize(card))) {
885 /* The sanitize operation is supported at v4.5 only */
886 if (mmc_can_sanitize(card)) {
887 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
888 EXT_CSD_SANITIZE_START, 1, 0);
892 from = blk_rq_pos(req);
893 nr = blk_rq_sectors(req);
895 if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
896 arg = MMC_SECURE_TRIM1_ARG;
898 arg = MMC_SECURE_ERASE_ARG;
900 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
901 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
902 INAND_CMD38_ARG_EXT_CSD,
903 arg == MMC_SECURE_TRIM1_ARG ?
904 INAND_CMD38_ARG_SECTRIM1 :
905 INAND_CMD38_ARG_SECERASE,
910 err = mmc_erase(card, from, nr, arg);
911 if (!err && arg == MMC_SECURE_TRIM1_ARG) {
912 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
913 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
914 INAND_CMD38_ARG_EXT_CSD,
915 INAND_CMD38_ARG_SECTRIM2,
920 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
923 if (err == -EIO && !mmc_blk_reset(md, card->host, type))
926 mmc_blk_reset_success(md, type);
927 spin_lock_irq(&md->lock);
928 __blk_end_request(req, err, blk_rq_bytes(req));
929 spin_unlock_irq(&md->lock);
934 static int mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
936 struct mmc_blk_data *md = mq->data;
937 struct mmc_card *card = md->queue.card;
940 ret = mmc_flush_cache(card);
944 spin_lock_irq(&md->lock);
945 __blk_end_request_all(req, ret);
946 spin_unlock_irq(&md->lock);
952 * Reformat current write as a reliable write, supporting
953 * both legacy and the enhanced reliable write MMC cards.
954 * In each transfer we'll handle only as much as a single
955 * reliable write can handle, thus finish the request in
956 * partial completions.
958 static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
959 struct mmc_card *card,
962 if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
963 /* Legacy mode imposes restrictions on transfers. */
964 if (!IS_ALIGNED(brq->cmd.arg, card->ext_csd.rel_sectors))
965 brq->data.blocks = 1;
967 if (brq->data.blocks > card->ext_csd.rel_sectors)
968 brq->data.blocks = card->ext_csd.rel_sectors;
969 else if (brq->data.blocks < card->ext_csd.rel_sectors)
970 brq->data.blocks = 1;
975 (R1_OUT_OF_RANGE | /* Command argument out of range */ \
976 R1_ADDRESS_ERROR | /* Misaligned address */ \
977 R1_BLOCK_LEN_ERROR | /* Transferred block length incorrect */\
978 R1_WP_VIOLATION | /* Tried to write to protected block */ \
979 R1_CC_ERROR | /* Card controller error */ \
980 R1_ERROR) /* General/unknown error */
982 static int mmc_blk_err_check(struct mmc_card *card,
983 struct mmc_async_req *areq)
985 struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
987 struct mmc_blk_request *brq = &mq_mrq->brq;
988 struct request *req = mq_mrq->req;
992 * sbc.error indicates a problem with the set block count
993 * command. No data will have been transferred.
995 * cmd.error indicates a problem with the r/w command. No
996 * data will have been transferred.
998 * stop.error indicates a problem with the stop command. Data
999 * may have been transferred, or may still be transferring.
1001 if (brq->sbc.error || brq->cmd.error || brq->stop.error ||
1003 switch (mmc_blk_cmd_recovery(card, req, brq, &ecc_err)) {
1005 return MMC_BLK_RETRY;
1007 return MMC_BLK_ABORT;
1009 return MMC_BLK_NOMEDIUM;
1016 * Check for errors relating to the execution of the
1017 * initial command - such as address errors. No data
1018 * has been transferred.
1020 if (brq->cmd.resp[0] & CMD_ERRORS) {
1021 pr_err("%s: r/w command failed, status = %#x\n",
1022 req->rq_disk->disk_name, brq->cmd.resp[0]);
1023 return MMC_BLK_ABORT;
1027 * Everything else is either success, or a data error of some
1028 * kind. If it was a write, we may have transitioned to
1029 * program mode, which we have to wait for it to complete.
1031 if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
1034 int err = get_card_status(card, &status, 5);
1036 pr_err("%s: error %d requesting status\n",
1037 req->rq_disk->disk_name, err);
1038 return MMC_BLK_CMD_ERR;
1041 * Some cards mishandle the status bits,
1042 * so make sure to check both the busy
1043 * indication and the card state.
1045 } while (!(status & R1_READY_FOR_DATA) ||
1046 (R1_CURRENT_STATE(status) == R1_STATE_PRG));
1049 if (brq->data.error) {
1050 pr_err("%s: error %d transferring data, sector %u, nr %u, cmd response %#x, card status %#x\n",
1051 req->rq_disk->disk_name, brq->data.error,
1052 (unsigned)blk_rq_pos(req),
1053 (unsigned)blk_rq_sectors(req),
1054 brq->cmd.resp[0], brq->stop.resp[0]);
1056 if (rq_data_dir(req) == READ) {
1058 return MMC_BLK_ECC_ERR;
1059 return MMC_BLK_DATA_ERR;
1061 return MMC_BLK_CMD_ERR;
1065 if (!brq->data.bytes_xfered)
1066 return MMC_BLK_RETRY;
1068 if (blk_rq_bytes(req) != brq->data.bytes_xfered)
1069 return MMC_BLK_PARTIAL;
1071 return MMC_BLK_SUCCESS;
1074 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
1075 struct mmc_card *card,
1077 struct mmc_queue *mq)
1079 u32 readcmd, writecmd;
1080 struct mmc_blk_request *brq = &mqrq->brq;
1081 struct request *req = mqrq->req;
1082 struct mmc_blk_data *md = mq->data;
1086 * Reliable writes are used to implement Forced Unit Access and
1087 * REQ_META accesses, and are supported only on MMCs.
1089 * XXX: this really needs a good explanation of why REQ_META
1090 * is treated special.
1092 bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
1093 (req->cmd_flags & REQ_META)) &&
1094 (rq_data_dir(req) == WRITE) &&
1095 (md->flags & MMC_BLK_REL_WR);
1097 memset(brq, 0, sizeof(struct mmc_blk_request));
1098 brq->mrq.cmd = &brq->cmd;
1099 brq->mrq.data = &brq->data;
1101 brq->cmd.arg = blk_rq_pos(req);
1102 if (!mmc_card_blockaddr(card))
1104 brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1105 brq->data.blksz = 512;
1106 brq->stop.opcode = MMC_STOP_TRANSMISSION;
1108 brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1109 brq->data.blocks = blk_rq_sectors(req);
1112 * The block layer doesn't support all sector count
1113 * restrictions, so we need to be prepared for too big
1116 if (brq->data.blocks > card->host->max_blk_count)
1117 brq->data.blocks = card->host->max_blk_count;
1119 if (brq->data.blocks > 1) {
1121 * After a read error, we redo the request one sector
1122 * at a time in order to accurately determine which
1123 * sectors can be read successfully.
1126 brq->data.blocks = 1;
1128 /* Some controllers can't do multiblock reads due to hw bugs */
1129 if (card->host->caps2 & MMC_CAP2_NO_MULTI_READ &&
1130 rq_data_dir(req) == READ)
1131 brq->data.blocks = 1;
1134 if (brq->data.blocks > 1 || do_rel_wr) {
1135 /* SPI multiblock writes terminate using a special
1136 * token, not a STOP_TRANSMISSION request.
1138 if (!mmc_host_is_spi(card->host) ||
1139 rq_data_dir(req) == READ)
1140 brq->mrq.stop = &brq->stop;
1141 readcmd = MMC_READ_MULTIPLE_BLOCK;
1142 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1144 brq->mrq.stop = NULL;
1145 readcmd = MMC_READ_SINGLE_BLOCK;
1146 writecmd = MMC_WRITE_BLOCK;
1148 if (rq_data_dir(req) == READ) {
1149 brq->cmd.opcode = readcmd;
1150 brq->data.flags |= MMC_DATA_READ;
1152 brq->cmd.opcode = writecmd;
1153 brq->data.flags |= MMC_DATA_WRITE;
1157 mmc_apply_rel_rw(brq, card, req);
1160 * Data tag is used only during writing meta data to speed
1161 * up write and any subsequent read of this meta data
1163 do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1164 (req->cmd_flags & REQ_META) &&
1165 (rq_data_dir(req) == WRITE) &&
1166 ((brq->data.blocks * brq->data.blksz) >=
1167 card->ext_csd.data_tag_unit_size);
1170 * Pre-defined multi-block transfers are preferable to
1171 * open ended-ones (and necessary for reliable writes).
1172 * However, it is not sufficient to just send CMD23,
1173 * and avoid the final CMD12, as on an error condition
1174 * CMD12 (stop) needs to be sent anyway. This, coupled
1175 * with Auto-CMD23 enhancements provided by some
1176 * hosts, means that the complexity of dealing
1177 * with this is best left to the host. If CMD23 is
1178 * supported by card and host, we'll fill sbc in and let
1179 * the host deal with handling it correctly. This means
1180 * that for hosts that don't expose MMC_CAP_CMD23, no
1181 * change of behavior will be observed.
1183 * N.B: Some MMC cards experience perf degradation.
1184 * We'll avoid using CMD23-bounded multiblock writes for
1185 * these, while retaining features like reliable writes.
1187 if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
1188 (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
1190 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1191 brq->sbc.arg = brq->data.blocks |
1192 (do_rel_wr ? (1 << 31) : 0) |
1193 (do_data_tag ? (1 << 29) : 0);
1194 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1195 brq->mrq.sbc = &brq->sbc;
1198 mmc_set_data_timeout(&brq->data, card);
1200 brq->data.sg = mqrq->sg;
1201 brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1204 * Adjust the sg list so it is the same size as the
1207 if (brq->data.blocks != blk_rq_sectors(req)) {
1208 int i, data_size = brq->data.blocks << 9;
1209 struct scatterlist *sg;
1211 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1212 data_size -= sg->length;
1213 if (data_size <= 0) {
1214 sg->length += data_size;
1219 brq->data.sg_len = i;
1222 mqrq->mmc_active.mrq = &brq->mrq;
1223 mqrq->mmc_active.err_check = mmc_blk_err_check;
1225 mmc_queue_bounce_pre(mqrq);
1228 static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
1229 struct mmc_blk_request *brq, struct request *req,
1233 * If this is an SD card and we're writing, we can first
1234 * mark the known good sectors as ok.
1236 * If the card is not SD, we can still ok written sectors
1237 * as reported by the controller (which might be less than
1238 * the real number of written sectors, but never more).
1240 if (mmc_card_sd(card)) {
1243 blocks = mmc_sd_num_wr_blocks(card);
1244 if (blocks != (u32)-1) {
1245 spin_lock_irq(&md->lock);
1246 ret = __blk_end_request(req, 0, blocks << 9);
1247 spin_unlock_irq(&md->lock);
1250 spin_lock_irq(&md->lock);
1251 ret = __blk_end_request(req, 0, brq->data.bytes_xfered);
1252 spin_unlock_irq(&md->lock);
1257 static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
1259 struct mmc_blk_data *md = mq->data;
1260 struct mmc_card *card = md->queue.card;
1261 struct mmc_blk_request *brq = &mq->mqrq_cur->brq;
1262 int ret = 1, disable_multi = 0, retry = 0, type;
1263 enum mmc_blk_status status;
1264 struct mmc_queue_req *mq_rq;
1265 struct request *req;
1266 struct mmc_async_req *areq;
1268 if (!rqc && !mq->mqrq_prev->req)
1273 mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1274 areq = &mq->mqrq_cur->mmc_active;
1277 areq = mmc_start_req(card->host, areq, (int *) &status);
1281 mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
1284 type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1285 mmc_queue_bounce_post(mq_rq);
1288 case MMC_BLK_SUCCESS:
1289 case MMC_BLK_PARTIAL:
1291 * A block was successfully transferred.
1293 mmc_blk_reset_success(md, type);
1294 spin_lock_irq(&md->lock);
1295 ret = __blk_end_request(req, 0,
1296 brq->data.bytes_xfered);
1297 spin_unlock_irq(&md->lock);
1299 * If the blk_end_request function returns non-zero even
1300 * though all data has been transferred and no errors
1301 * were returned by the host controller, it's a bug.
1303 if (status == MMC_BLK_SUCCESS && ret) {
1304 pr_err("%s BUG rq_tot %d d_xfer %d\n",
1305 __func__, blk_rq_bytes(req),
1306 brq->data.bytes_xfered);
1311 case MMC_BLK_CMD_ERR:
1312 ret = mmc_blk_cmd_err(md, card, brq, req, ret);
1313 if (!mmc_blk_reset(md, card->host, type))
1321 if (!mmc_blk_reset(md, card->host, type))
1324 case MMC_BLK_DATA_ERR: {
1327 err = mmc_blk_reset(md, card->host, type);
1334 case MMC_BLK_ECC_ERR:
1335 if (brq->data.blocks > 1) {
1336 /* Redo read one sector at a time */
1337 pr_warning("%s: retrying using single block read\n",
1338 req->rq_disk->disk_name);
1343 * After an error, we redo I/O one sector at a
1344 * time, so we only reach here after trying to
1345 * read a single sector.
1347 spin_lock_irq(&md->lock);
1348 ret = __blk_end_request(req, -EIO,
1350 spin_unlock_irq(&md->lock);
1354 case MMC_BLK_NOMEDIUM:
1360 * In case of a incomplete request
1361 * prepare it again and resend.
1363 mmc_blk_rw_rq_prep(mq_rq, card, disable_multi, mq);
1364 mmc_start_req(card->host, &mq_rq->mmc_active, NULL);
1371 spin_lock_irq(&md->lock);
1372 if (mmc_card_removed(card))
1373 req->cmd_flags |= REQ_QUIET;
1375 ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req));
1376 spin_unlock_irq(&md->lock);
1380 mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1381 mmc_start_req(card->host, &mq->mqrq_cur->mmc_active, NULL);
1387 static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
1390 struct mmc_blk_data *md = mq->data;
1391 struct mmc_card *card = md->queue.card;
1393 if (req && !mq->mqrq_prev->req)
1394 /* claim host only for the first request */
1395 mmc_claim_host(card->host);
1397 ret = mmc_blk_part_switch(card, md);
1400 spin_lock_irq(&md->lock);
1401 __blk_end_request_all(req, -EIO);
1402 spin_unlock_irq(&md->lock);
1408 if (req && req->cmd_flags & REQ_DISCARD) {
1409 /* complete ongoing async transfer before issuing discard */
1410 if (card->host->areq)
1411 mmc_blk_issue_rw_rq(mq, NULL);
1412 if (req->cmd_flags & REQ_SECURE)
1413 ret = mmc_blk_issue_secdiscard_rq(mq, req);
1415 ret = mmc_blk_issue_discard_rq(mq, req);
1416 } else if (req && req->cmd_flags & REQ_FLUSH) {
1417 /* complete ongoing async transfer before issuing flush */
1418 if (card->host->areq)
1419 mmc_blk_issue_rw_rq(mq, NULL);
1420 ret = mmc_blk_issue_flush(mq, req);
1422 ret = mmc_blk_issue_rw_rq(mq, req);
1427 /* release host only when there are no more requests */
1428 mmc_release_host(card->host);
1432 static inline int mmc_blk_readonly(struct mmc_card *card)
1434 return mmc_card_readonly(card) ||
1435 !(card->csd.cmdclass & CCC_BLOCK_WRITE);
1438 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
1439 struct device *parent,
1442 const char *subname,
1445 struct mmc_blk_data *md;
1448 devidx = find_first_zero_bit(dev_use, max_devices);
1449 if (devidx >= max_devices)
1450 return ERR_PTR(-ENOSPC);
1451 __set_bit(devidx, dev_use);
1453 md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
1460 * !subname implies we are creating main mmc_blk_data that will be
1461 * associated with mmc_card with mmc_set_drvdata. Due to device
1462 * partitions, devidx will not coincide with a per-physical card
1463 * index anymore so we keep track of a name index.
1466 md->name_idx = find_first_zero_bit(name_use, max_devices);
1467 __set_bit(md->name_idx, name_use);
1469 md->name_idx = ((struct mmc_blk_data *)
1470 dev_to_disk(parent)->private_data)->name_idx;
1472 md->area_type = area_type;
1475 * Set the read-only status based on the supported commands
1476 * and the write protect switch.
1478 md->read_only = mmc_blk_readonly(card);
1480 md->disk = alloc_disk(perdev_minors);
1481 if (md->disk == NULL) {
1486 spin_lock_init(&md->lock);
1487 INIT_LIST_HEAD(&md->part);
1490 ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
1494 md->queue.issue_fn = mmc_blk_issue_rq;
1495 md->queue.data = md;
1497 md->disk->major = MMC_BLOCK_MAJOR;
1498 md->disk->first_minor = devidx * perdev_minors;
1499 md->disk->fops = &mmc_bdops;
1500 md->disk->private_data = md;
1501 md->disk->queue = md->queue.queue;
1502 md->disk->driverfs_dev = parent;
1503 set_disk_ro(md->disk, md->read_only || default_ro);
1506 * As discussed on lkml, GENHD_FL_REMOVABLE should:
1508 * - be set for removable media with permanent block devices
1509 * - be unset for removable block devices with permanent media
1511 * Since MMC block devices clearly fall under the second
1512 * case, we do not set GENHD_FL_REMOVABLE. Userspace
1513 * should use the block device creation/destruction hotplug
1514 * messages to tell when the card is present.
1517 snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
1518 "mmcblk%d%s", md->name_idx, subname ? subname : "");
1520 blk_queue_logical_block_size(md->queue.queue, 512);
1521 set_capacity(md->disk, size);
1523 if (mmc_host_cmd23(card->host)) {
1524 if (mmc_card_mmc(card) ||
1525 (mmc_card_sd(card) &&
1526 card->scr.cmds & SD_SCR_CMD23_SUPPORT))
1527 md->flags |= MMC_BLK_CMD23;
1530 if (mmc_card_mmc(card) &&
1531 md->flags & MMC_BLK_CMD23 &&
1532 ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
1533 card->ext_csd.rel_sectors)) {
1534 md->flags |= MMC_BLK_REL_WR;
1535 blk_queue_flush(md->queue.queue, REQ_FLUSH | REQ_FUA);
1545 return ERR_PTR(ret);
1548 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
1551 struct mmc_blk_data *md;
1553 if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
1555 * The EXT_CSD sector count is in number or 512 byte
1558 size = card->ext_csd.sectors;
1561 * The CSD capacity field is in units of read_blkbits.
1562 * set_capacity takes units of 512 bytes.
1564 size = card->csd.capacity << (card->csd.read_blkbits - 9);
1567 md = mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
1568 MMC_BLK_DATA_AREA_MAIN);
1572 static int mmc_blk_alloc_part(struct mmc_card *card,
1573 struct mmc_blk_data *md,
1574 unsigned int part_type,
1577 const char *subname,
1581 struct mmc_blk_data *part_md;
1583 part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
1584 subname, area_type);
1585 if (IS_ERR(part_md))
1586 return PTR_ERR(part_md);
1587 part_md->part_type = part_type;
1588 list_add(&part_md->part, &md->part);
1590 string_get_size((u64)get_capacity(part_md->disk) << 9, STRING_UNITS_2,
1591 cap_str, sizeof(cap_str));
1592 pr_info("%s: %s %s partition %u %s\n",
1593 part_md->disk->disk_name, mmc_card_id(card),
1594 mmc_card_name(card), part_md->part_type, cap_str);
1598 /* MMC Physical partitions consist of two boot partitions and
1599 * up to four general purpose partitions.
1600 * For each partition enabled in EXT_CSD a block device will be allocatedi
1601 * to provide access to the partition.
1604 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
1608 if (!mmc_card_mmc(card))
1611 for (idx = 0; idx < card->nr_parts; idx++) {
1612 if (card->part[idx].size) {
1613 ret = mmc_blk_alloc_part(card, md,
1614 card->part[idx].part_cfg,
1615 card->part[idx].size >> 9,
1616 card->part[idx].force_ro,
1617 card->part[idx].name,
1618 card->part[idx].area_type);
1628 mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card)
1632 mmc_claim_host(card->host);
1633 err = mmc_set_blocklen(card, 512);
1634 mmc_release_host(card->host);
1637 pr_err("%s: unable to set block size to 512: %d\n",
1638 md->disk->disk_name, err);
1645 static void mmc_blk_remove_req(struct mmc_blk_data *md)
1647 struct mmc_card *card;
1650 card = md->queue.card;
1651 if (md->disk->flags & GENHD_FL_UP) {
1652 device_remove_file(disk_to_dev(md->disk), &md->force_ro);
1653 if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
1654 card->ext_csd.boot_ro_lockable)
1655 device_remove_file(disk_to_dev(md->disk),
1656 &md->power_ro_lock);
1658 /* Stop new requests from getting into the queue */
1659 del_gendisk(md->disk);
1662 /* Then flush out any already in there */
1663 mmc_cleanup_queue(&md->queue);
1668 static void mmc_blk_remove_parts(struct mmc_card *card,
1669 struct mmc_blk_data *md)
1671 struct list_head *pos, *q;
1672 struct mmc_blk_data *part_md;
1674 __clear_bit(md->name_idx, name_use);
1675 list_for_each_safe(pos, q, &md->part) {
1676 part_md = list_entry(pos, struct mmc_blk_data, part);
1678 mmc_blk_remove_req(part_md);
1682 static int mmc_add_disk(struct mmc_blk_data *md)
1685 struct mmc_card *card = md->queue.card;
1688 md->force_ro.show = force_ro_show;
1689 md->force_ro.store = force_ro_store;
1690 sysfs_attr_init(&md->force_ro.attr);
1691 md->force_ro.attr.name = "force_ro";
1692 md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
1693 ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
1697 if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
1698 card->ext_csd.boot_ro_lockable) {
1701 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS)
1704 mode = S_IRUGO | S_IWUSR;
1706 md->power_ro_lock.show = power_ro_lock_show;
1707 md->power_ro_lock.store = power_ro_lock_store;
1708 sysfs_attr_init(&md->power_ro_lock.attr);
1709 md->power_ro_lock.attr.mode = mode;
1710 md->power_ro_lock.attr.name =
1711 "ro_lock_until_next_power_on";
1712 ret = device_create_file(disk_to_dev(md->disk),
1713 &md->power_ro_lock);
1715 goto power_ro_lock_fail;
1720 device_remove_file(disk_to_dev(md->disk), &md->force_ro);
1722 del_gendisk(md->disk);
1727 #define CID_MANFID_SANDISK 0x2
1728 #define CID_MANFID_TOSHIBA 0x11
1729 #define CID_MANFID_MICRON 0x13
1731 static const struct mmc_fixup blk_fixups[] =
1733 MMC_FIXUP("SEM02G", CID_MANFID_SANDISK, 0x100, add_quirk,
1734 MMC_QUIRK_INAND_CMD38),
1735 MMC_FIXUP("SEM04G", CID_MANFID_SANDISK, 0x100, add_quirk,
1736 MMC_QUIRK_INAND_CMD38),
1737 MMC_FIXUP("SEM08G", CID_MANFID_SANDISK, 0x100, add_quirk,
1738 MMC_QUIRK_INAND_CMD38),
1739 MMC_FIXUP("SEM16G", CID_MANFID_SANDISK, 0x100, add_quirk,
1740 MMC_QUIRK_INAND_CMD38),
1741 MMC_FIXUP("SEM32G", CID_MANFID_SANDISK, 0x100, add_quirk,
1742 MMC_QUIRK_INAND_CMD38),
1745 * Some MMC cards experience performance degradation with CMD23
1746 * instead of CMD12-bounded multiblock transfers. For now we'll
1747 * black list what's bad...
1748 * - Certain Toshiba cards.
1750 * N.B. This doesn't affect SD cards.
1752 MMC_FIXUP("MMC08G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
1753 MMC_QUIRK_BLK_NO_CMD23),
1754 MMC_FIXUP("MMC16G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
1755 MMC_QUIRK_BLK_NO_CMD23),
1756 MMC_FIXUP("MMC32G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
1757 MMC_QUIRK_BLK_NO_CMD23),
1760 * Some Micron MMC cards needs longer data read timeout than
1763 MMC_FIXUP(CID_NAME_ANY, CID_MANFID_MICRON, 0x200, add_quirk_mmc,
1764 MMC_QUIRK_LONG_READ_TIME),
1769 static int mmc_blk_probe(struct mmc_card *card)
1771 struct mmc_blk_data *md, *part_md;
1776 * Check that the card supports the command class(es) we need.
1778 if (!(card->csd.cmdclass & CCC_BLOCK_READ))
1781 md = mmc_blk_alloc(card);
1785 err = mmc_blk_set_blksize(md, card);
1789 string_get_size((u64)get_capacity(md->disk) << 9, STRING_UNITS_2,
1790 cap_str, sizeof(cap_str));
1791 pr_info("%s: %s %s %s %s\n",
1792 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
1793 cap_str, md->read_only ? "(ro)" : "");
1795 if (mmc_blk_alloc_parts(card, md))
1798 mmc_set_drvdata(card, md);
1799 mmc_fixup_device(card, blk_fixups);
1801 if (mmc_add_disk(md))
1804 list_for_each_entry(part_md, &md->part, part) {
1805 if (mmc_add_disk(part_md))
1811 mmc_blk_remove_parts(card, md);
1812 mmc_blk_remove_req(md);
1816 static void mmc_blk_remove(struct mmc_card *card)
1818 struct mmc_blk_data *md = mmc_get_drvdata(card);
1820 mmc_blk_remove_parts(card, md);
1821 mmc_claim_host(card->host);
1822 mmc_blk_part_switch(card, md);
1823 mmc_release_host(card->host);
1824 mmc_blk_remove_req(md);
1825 mmc_set_drvdata(card, NULL);
1829 static int mmc_blk_suspend(struct mmc_card *card, pm_message_t state)
1831 struct mmc_blk_data *part_md;
1832 struct mmc_blk_data *md = mmc_get_drvdata(card);
1835 mmc_queue_suspend(&md->queue);
1836 list_for_each_entry(part_md, &md->part, part) {
1837 mmc_queue_suspend(&part_md->queue);
1843 static int mmc_blk_resume(struct mmc_card *card)
1845 struct mmc_blk_data *part_md;
1846 struct mmc_blk_data *md = mmc_get_drvdata(card);
1849 mmc_blk_set_blksize(md, card);
1852 * Resume involves the card going into idle state,
1853 * so current partition is always the main one.
1855 md->part_curr = md->part_type;
1856 mmc_queue_resume(&md->queue);
1857 list_for_each_entry(part_md, &md->part, part) {
1858 mmc_queue_resume(&part_md->queue);
1864 #define mmc_blk_suspend NULL
1865 #define mmc_blk_resume NULL
1868 static struct mmc_driver mmc_driver = {
1872 .probe = mmc_blk_probe,
1873 .remove = mmc_blk_remove,
1874 .suspend = mmc_blk_suspend,
1875 .resume = mmc_blk_resume,
1878 static int __init mmc_blk_init(void)
1882 if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
1883 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
1885 max_devices = 256 / perdev_minors;
1887 res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
1891 res = mmc_register_driver(&mmc_driver);
1897 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
1902 static void __exit mmc_blk_exit(void)
1904 mmc_unregister_driver(&mmc_driver);
1905 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
1908 module_init(mmc_blk_init);
1909 module_exit(mmc_blk_exit);
1911 MODULE_LICENSE("GPL");
1912 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");