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;
99 * Only set in main mmc_blk_data associated
100 * with mmc_card with mmc_set_drvdata, and keeps
101 * track of the current selected device partition.
103 unsigned int part_curr;
104 struct device_attribute force_ro;
107 static DEFINE_MUTEX(open_lock);
109 module_param(perdev_minors, int, 0444);
110 MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
112 static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
114 struct mmc_blk_data *md;
116 mutex_lock(&open_lock);
117 md = disk->private_data;
118 if (md && md->usage == 0)
122 mutex_unlock(&open_lock);
127 static inline int mmc_get_devidx(struct gendisk *disk)
129 int devidx = disk->first_minor / perdev_minors;
133 static void mmc_blk_put(struct mmc_blk_data *md)
135 mutex_lock(&open_lock);
137 if (md->usage == 0) {
138 int devidx = mmc_get_devidx(md->disk);
139 blk_cleanup_queue(md->queue.queue);
141 __clear_bit(devidx, dev_use);
146 mutex_unlock(&open_lock);
149 static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
153 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
155 ret = snprintf(buf, PAGE_SIZE, "%d",
156 get_disk_ro(dev_to_disk(dev)) ^
162 static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
163 const char *buf, size_t count)
167 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
168 unsigned long set = simple_strtoul(buf, &end, 0);
174 set_disk_ro(dev_to_disk(dev), set || md->read_only);
181 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
183 struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
186 mutex_lock(&block_mutex);
189 check_disk_change(bdev);
192 if ((mode & FMODE_WRITE) && md->read_only) {
197 mutex_unlock(&block_mutex);
202 static int mmc_blk_release(struct gendisk *disk, fmode_t mode)
204 struct mmc_blk_data *md = disk->private_data;
206 mutex_lock(&block_mutex);
208 mutex_unlock(&block_mutex);
213 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
215 geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
221 struct mmc_blk_ioc_data {
222 struct mmc_ioc_cmd ic;
227 static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
228 struct mmc_ioc_cmd __user *user)
230 struct mmc_blk_ioc_data *idata;
233 idata = kzalloc(sizeof(*idata), GFP_KERNEL);
239 if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
244 idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
245 if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
250 if (!idata->buf_bytes)
253 idata->buf = kzalloc(idata->buf_bytes, GFP_KERNEL);
259 if (copy_from_user(idata->buf, (void __user *)(unsigned long)
260 idata->ic.data_ptr, idata->buf_bytes)) {
275 static int mmc_blk_ioctl_cmd(struct block_device *bdev,
276 struct mmc_ioc_cmd __user *ic_ptr)
278 struct mmc_blk_ioc_data *idata;
279 struct mmc_blk_data *md;
280 struct mmc_card *card;
281 struct mmc_command cmd = {0};
282 struct mmc_data data = {0};
283 struct mmc_request mrq = {0};
284 struct scatterlist sg;
288 * The caller must have CAP_SYS_RAWIO, and must be calling this on the
289 * whole block device, not on a partition. This prevents overspray
290 * between sibling partitions.
292 if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
295 idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
297 return PTR_ERR(idata);
299 md = mmc_blk_get(bdev->bd_disk);
305 card = md->queue.card;
311 cmd.opcode = idata->ic.opcode;
312 cmd.arg = idata->ic.arg;
313 cmd.flags = idata->ic.flags;
315 if (idata->buf_bytes) {
318 data.blksz = idata->ic.blksz;
319 data.blocks = idata->ic.blocks;
321 sg_init_one(data.sg, idata->buf, idata->buf_bytes);
323 if (idata->ic.write_flag)
324 data.flags = MMC_DATA_WRITE;
326 data.flags = MMC_DATA_READ;
328 /* data.flags must already be set before doing this. */
329 mmc_set_data_timeout(&data, card);
331 /* Allow overriding the timeout_ns for empirical tuning. */
332 if (idata->ic.data_timeout_ns)
333 data.timeout_ns = idata->ic.data_timeout_ns;
335 if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
337 * Pretend this is a data transfer and rely on the
338 * host driver to compute timeout. When all host
339 * drivers support cmd.cmd_timeout for R1B, this
343 * cmd.cmd_timeout = idata->ic.cmd_timeout_ms;
345 data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000;
353 mmc_claim_host(card->host);
355 if (idata->ic.is_acmd) {
356 err = mmc_app_cmd(card->host, card);
361 mmc_wait_for_req(card->host, &mrq);
364 dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
365 __func__, cmd.error);
370 dev_err(mmc_dev(card->host), "%s: data error %d\n",
371 __func__, data.error);
377 * According to the SD specs, some commands require a delay after
378 * issuing the command.
380 if (idata->ic.postsleep_min_us)
381 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
383 if (copy_to_user(&(ic_ptr->response), cmd.resp, sizeof(cmd.resp))) {
388 if (!idata->ic.write_flag) {
389 if (copy_to_user((void __user *)(unsigned long) idata->ic.data_ptr,
390 idata->buf, idata->buf_bytes)) {
397 mmc_release_host(card->host);
406 static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
407 unsigned int cmd, unsigned long arg)
410 if (cmd == MMC_IOC_CMD)
411 ret = mmc_blk_ioctl_cmd(bdev, (struct mmc_ioc_cmd __user *)arg);
416 static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
417 unsigned int cmd, unsigned long arg)
419 return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
423 static const struct block_device_operations mmc_bdops = {
424 .open = mmc_blk_open,
425 .release = mmc_blk_release,
426 .getgeo = mmc_blk_getgeo,
427 .owner = THIS_MODULE,
428 .ioctl = mmc_blk_ioctl,
430 .compat_ioctl = mmc_blk_compat_ioctl,
434 struct mmc_blk_request {
435 struct mmc_request mrq;
436 struct mmc_command sbc;
437 struct mmc_command cmd;
438 struct mmc_command stop;
439 struct mmc_data data;
442 static inline int mmc_blk_part_switch(struct mmc_card *card,
443 struct mmc_blk_data *md)
446 struct mmc_blk_data *main_md = mmc_get_drvdata(card);
447 if (main_md->part_curr == md->part_type)
450 if (mmc_card_mmc(card)) {
451 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
452 card->ext_csd.part_config |= md->part_type;
454 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
455 EXT_CSD_PART_CONFIG, card->ext_csd.part_config,
456 card->ext_csd.part_time);
461 main_md->part_curr = md->part_type;
465 static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
471 struct mmc_request mrq = {0};
472 struct mmc_command cmd = {0};
473 struct mmc_data data = {0};
474 unsigned int timeout_us;
476 struct scatterlist sg;
478 cmd.opcode = MMC_APP_CMD;
479 cmd.arg = card->rca << 16;
480 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
482 err = mmc_wait_for_cmd(card->host, &cmd, 0);
485 if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
488 memset(&cmd, 0, sizeof(struct mmc_command));
490 cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
492 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
494 data.timeout_ns = card->csd.tacc_ns * 100;
495 data.timeout_clks = card->csd.tacc_clks * 100;
497 timeout_us = data.timeout_ns / 1000;
498 timeout_us += data.timeout_clks * 1000 /
499 (card->host->ios.clock / 1000);
501 if (timeout_us > 100000) {
502 data.timeout_ns = 100000000;
503 data.timeout_clks = 0;
508 data.flags = MMC_DATA_READ;
515 blocks = kmalloc(4, GFP_KERNEL);
519 sg_init_one(&sg, blocks, 4);
521 mmc_wait_for_req(card->host, &mrq);
523 result = ntohl(*blocks);
526 if (cmd.error || data.error)
532 static int send_stop(struct mmc_card *card, u32 *status)
534 struct mmc_command cmd = {0};
537 cmd.opcode = MMC_STOP_TRANSMISSION;
538 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
539 err = mmc_wait_for_cmd(card->host, &cmd, 5);
541 *status = cmd.resp[0];
545 static int get_card_status(struct mmc_card *card, u32 *status, int retries)
547 struct mmc_command cmd = {0};
550 cmd.opcode = MMC_SEND_STATUS;
551 if (!mmc_host_is_spi(card->host))
552 cmd.arg = card->rca << 16;
553 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
554 err = mmc_wait_for_cmd(card->host, &cmd, retries);
556 *status = cmd.resp[0];
562 #define ERR_CONTINUE 0
564 static int mmc_blk_cmd_error(struct request *req, const char *name, int error,
565 bool status_valid, u32 status)
569 /* response crc error, retry the r/w cmd */
570 pr_err("%s: %s sending %s command, card status %#x\n",
571 req->rq_disk->disk_name, "response CRC error",
576 pr_err("%s: %s sending %s command, card status %#x\n",
577 req->rq_disk->disk_name, "timed out", name, status);
579 /* If the status cmd initially failed, retry the r/w cmd */
581 pr_err("%s: status not valid, retrying timeout\n", req->rq_disk->disk_name);
585 * If it was a r/w cmd crc error, or illegal command
586 * (eg, issued in wrong state) then retry - we should
587 * have corrected the state problem above.
589 if (status & (R1_COM_CRC_ERROR | R1_ILLEGAL_COMMAND)) {
590 pr_err("%s: command error, retrying timeout\n", req->rq_disk->disk_name);
594 /* Otherwise abort the command */
595 pr_err("%s: not retrying timeout\n", req->rq_disk->disk_name);
599 /* We don't understand the error code the driver gave us */
600 pr_err("%s: unknown error %d sending read/write command, card status %#x\n",
601 req->rq_disk->disk_name, error, status);
607 * Initial r/w and stop cmd error recovery.
608 * We don't know whether the card received the r/w cmd or not, so try to
609 * restore things back to a sane state. Essentially, we do this as follows:
610 * - Obtain card status. If the first attempt to obtain card status fails,
611 * the status word will reflect the failed status cmd, not the failed
612 * r/w cmd. If we fail to obtain card status, it suggests we can no
613 * longer communicate with the card.
614 * - Check the card state. If the card received the cmd but there was a
615 * transient problem with the response, it might still be in a data transfer
616 * mode. Try to send it a stop command. If this fails, we can't recover.
617 * - If the r/w cmd failed due to a response CRC error, it was probably
618 * transient, so retry the cmd.
619 * - If the r/w cmd timed out, but we didn't get the r/w cmd status, retry.
620 * - If the r/w cmd timed out, and the r/w cmd failed due to CRC error or
621 * illegal cmd, retry.
622 * Otherwise we don't understand what happened, so abort.
624 static int mmc_blk_cmd_recovery(struct mmc_card *card, struct request *req,
625 struct mmc_blk_request *brq)
627 bool prev_cmd_status_valid = true;
628 u32 status, stop_status = 0;
632 * Try to get card status which indicates both the card state
633 * and why there was no response. If the first attempt fails,
634 * we can't be sure the returned status is for the r/w command.
636 for (retry = 2; retry >= 0; retry--) {
637 err = get_card_status(card, &status, 0);
641 prev_cmd_status_valid = false;
642 pr_err("%s: error %d sending status command, %sing\n",
643 req->rq_disk->disk_name, err, retry ? "retry" : "abort");
646 /* We couldn't get a response from the card. Give up. */
651 * Check the current card state. If it is in some data transfer
652 * mode, tell it to stop (and hopefully transition back to TRAN.)
654 if (R1_CURRENT_STATE(status) == R1_STATE_DATA ||
655 R1_CURRENT_STATE(status) == R1_STATE_RCV) {
656 err = send_stop(card, &stop_status);
658 pr_err("%s: error %d sending stop command\n",
659 req->rq_disk->disk_name, err);
662 * If the stop cmd also timed out, the card is probably
663 * not present, so abort. Other errors are bad news too.
669 /* Check for set block count errors */
671 return mmc_blk_cmd_error(req, "SET_BLOCK_COUNT", brq->sbc.error,
672 prev_cmd_status_valid, status);
674 /* Check for r/w command errors */
676 return mmc_blk_cmd_error(req, "r/w cmd", brq->cmd.error,
677 prev_cmd_status_valid, status);
679 /* Now for stop errors. These aren't fatal to the transfer. */
680 pr_err("%s: error %d sending stop command, original cmd response %#x, card status %#x\n",
681 req->rq_disk->disk_name, brq->stop.error,
682 brq->cmd.resp[0], status);
685 * Subsitute in our own stop status as this will give the error
686 * state which happened during the execution of the r/w command.
689 brq->stop.resp[0] = stop_status;
695 static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
697 struct mmc_blk_data *md = mq->data;
698 struct mmc_card *card = md->queue.card;
699 unsigned int from, nr, arg;
702 if (!mmc_can_erase(card)) {
707 from = blk_rq_pos(req);
708 nr = blk_rq_sectors(req);
710 if (mmc_can_trim(card))
715 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
716 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
717 INAND_CMD38_ARG_EXT_CSD,
718 arg == MMC_TRIM_ARG ?
719 INAND_CMD38_ARG_TRIM :
720 INAND_CMD38_ARG_ERASE,
725 err = mmc_erase(card, from, nr, arg);
727 spin_lock_irq(&md->lock);
728 __blk_end_request(req, err, blk_rq_bytes(req));
729 spin_unlock_irq(&md->lock);
734 static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
737 struct mmc_blk_data *md = mq->data;
738 struct mmc_card *card = md->queue.card;
739 unsigned int from, nr, arg;
742 if (!mmc_can_secure_erase_trim(card)) {
747 from = blk_rq_pos(req);
748 nr = blk_rq_sectors(req);
750 if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
751 arg = MMC_SECURE_TRIM1_ARG;
753 arg = MMC_SECURE_ERASE_ARG;
755 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
756 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
757 INAND_CMD38_ARG_EXT_CSD,
758 arg == MMC_SECURE_TRIM1_ARG ?
759 INAND_CMD38_ARG_SECTRIM1 :
760 INAND_CMD38_ARG_SECERASE,
765 err = mmc_erase(card, from, nr, arg);
766 if (!err && arg == MMC_SECURE_TRIM1_ARG) {
767 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
768 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
769 INAND_CMD38_ARG_EXT_CSD,
770 INAND_CMD38_ARG_SECTRIM2,
775 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
778 spin_lock_irq(&md->lock);
779 __blk_end_request(req, err, blk_rq_bytes(req));
780 spin_unlock_irq(&md->lock);
785 static int mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
787 struct mmc_blk_data *md = mq->data;
790 * No-op, only service this because we need REQ_FUA for reliable
793 spin_lock_irq(&md->lock);
794 __blk_end_request_all(req, 0);
795 spin_unlock_irq(&md->lock);
801 * Reformat current write as a reliable write, supporting
802 * both legacy and the enhanced reliable write MMC cards.
803 * In each transfer we'll handle only as much as a single
804 * reliable write can handle, thus finish the request in
805 * partial completions.
807 static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
808 struct mmc_card *card,
811 if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
812 /* Legacy mode imposes restrictions on transfers. */
813 if (!IS_ALIGNED(brq->cmd.arg, card->ext_csd.rel_sectors))
814 brq->data.blocks = 1;
816 if (brq->data.blocks > card->ext_csd.rel_sectors)
817 brq->data.blocks = card->ext_csd.rel_sectors;
818 else if (brq->data.blocks < card->ext_csd.rel_sectors)
819 brq->data.blocks = 1;
824 (R1_OUT_OF_RANGE | /* Command argument out of range */ \
825 R1_ADDRESS_ERROR | /* Misaligned address */ \
826 R1_BLOCK_LEN_ERROR | /* Transferred block length incorrect */\
827 R1_WP_VIOLATION | /* Tried to write to protected block */ \
828 R1_CC_ERROR | /* Card controller error */ \
829 R1_ERROR) /* General/unknown error */
831 static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *req)
833 struct mmc_blk_data *md = mq->data;
834 struct mmc_card *card = md->queue.card;
835 struct mmc_blk_request brq;
836 int ret = 1, disable_multi = 0, retry = 0;
839 * Reliable writes are used to implement Forced Unit Access and
840 * REQ_META accesses, and are supported only on MMCs.
842 bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
843 (req->cmd_flags & REQ_META)) &&
844 (rq_data_dir(req) == WRITE) &&
845 (md->flags & MMC_BLK_REL_WR);
848 u32 readcmd, writecmd;
850 memset(&brq, 0, sizeof(struct mmc_blk_request));
851 brq.mrq.cmd = &brq.cmd;
852 brq.mrq.data = &brq.data;
854 #if defined(CONFIG_SDMMC_RK29) && !defined(CONFIG_SDMMC_RK29_OLD)
855 brq.cmd.retries = 2; //suppot retry read-write; added by xbw@2012-07-14
858 brq.cmd.arg = blk_rq_pos(req);
859 if (!mmc_card_blockaddr(card))
861 brq.cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
862 brq.data.blksz = 512;
863 brq.stop.opcode = MMC_STOP_TRANSMISSION;
865 brq.stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
866 brq.data.blocks = blk_rq_sectors(req);
869 * The block layer doesn't support all sector count
870 * restrictions, so we need to be prepared for too big
873 if (brq.data.blocks > card->host->max_blk_count)
874 brq.data.blocks = card->host->max_blk_count;
877 * After a read error, we redo the request one sector at a time
878 * in order to accurately determine which sectors can be read
881 if (disable_multi && brq.data.blocks > 1)
884 if (brq.data.blocks > 1 || do_rel_wr) {
885 /* SPI multiblock writes terminate using a special
886 * token, not a STOP_TRANSMISSION request.
888 if (!mmc_host_is_spi(card->host) ||
889 rq_data_dir(req) == READ)
890 brq.mrq.stop = &brq.stop;
891 readcmd = MMC_READ_MULTIPLE_BLOCK;
892 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
895 readcmd = MMC_READ_SINGLE_BLOCK;
896 writecmd = MMC_WRITE_BLOCK;
898 if (rq_data_dir(req) == READ) {
899 brq.cmd.opcode = readcmd;
900 brq.data.flags |= MMC_DATA_READ;
902 brq.cmd.opcode = writecmd;
903 brq.data.flags |= MMC_DATA_WRITE;
907 mmc_apply_rel_rw(&brq, card, req);
910 * Pre-defined multi-block transfers are preferable to
911 * open ended-ones (and necessary for reliable writes).
912 * However, it is not sufficient to just send CMD23,
913 * and avoid the final CMD12, as on an error condition
914 * CMD12 (stop) needs to be sent anyway. This, coupled
915 * with Auto-CMD23 enhancements provided by some
916 * hosts, means that the complexity of dealing
917 * with this is best left to the host. If CMD23 is
918 * supported by card and host, we'll fill sbc in and let
919 * the host deal with handling it correctly. This means
920 * that for hosts that don't expose MMC_CAP_CMD23, no
921 * change of behavior will be observed.
923 * N.B: Some MMC cards experience perf degradation.
924 * We'll avoid using CMD23-bounded multiblock writes for
925 * these, while retaining features like reliable writes.
928 if ((md->flags & MMC_BLK_CMD23) &&
929 mmc_op_multi(brq.cmd.opcode) &&
930 (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23))) {
931 brq.sbc.opcode = MMC_SET_BLOCK_COUNT;
932 brq.sbc.arg = brq.data.blocks |
933 (do_rel_wr ? (1 << 31) : 0);
934 brq.sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
935 brq.mrq.sbc = &brq.sbc;
938 mmc_set_data_timeout(&brq.data, card);
940 brq.data.sg = mq->sg;
941 brq.data.sg_len = mmc_queue_map_sg(mq);
944 * Adjust the sg list so it is the same size as the
947 if (brq.data.blocks != blk_rq_sectors(req)) {
948 int i, data_size = brq.data.blocks << 9;
949 struct scatterlist *sg;
951 for_each_sg(brq.data.sg, sg, brq.data.sg_len, i) {
952 data_size -= sg->length;
953 if (data_size <= 0) {
954 sg->length += data_size;
962 mmc_queue_bounce_pre(mq);
964 mmc_wait_for_req(card->host, &brq.mrq);
966 mmc_queue_bounce_post(mq);
968 #if defined(CONFIG_SDMMC_RK29) && !defined(CONFIG_SDMMC_RK29_OLD)
969 //delete all retry code. modifyed by xbw at 2011-11-17
972 * sbc.error indicates a problem with the set block count
973 * command. No data will have been transferred.
975 * cmd.error indicates a problem with the r/w command. No
976 * data will have been transferred.
978 * stop.error indicates a problem with the stop command. Data
979 * may have been transferred, or may still be transferring.
981 if (brq.sbc.error || brq.cmd.error || brq.stop.error) {
982 switch (mmc_blk_cmd_recovery(card, req, &brq)) {
995 * Check for errors relating to the execution of the
996 * initial command - such as address errors. No data
997 * has been transferred.
999 if (brq.cmd.resp[0] & CMD_ERRORS) {
1000 pr_err("%s: r/w command failed, status = %#x\n",
1001 req->rq_disk->disk_name, brq.cmd.resp[0]);
1005 #if defined(CONFIG_SDMMC_RK29) && !defined(CONFIG_SDMMC_RK29_OLD)
1006 //delete all retry code. modifyed by xbw at 2011-11-17
1009 * Everything else is either success, or a data error of some
1010 * kind. If it was a write, we may have transitioned to
1011 * program mode, which we have to wait for it to complete.
1013 if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
1016 int err = get_card_status(card, &status, 5);
1018 printk(KERN_ERR "%s: error %d requesting status\n",
1019 req->rq_disk->disk_name, err);
1023 * Some cards mishandle the status bits,
1024 * so make sure to check both the busy
1025 * indication and the card state.
1027 } while (!(status & R1_READY_FOR_DATA) ||
1028 (R1_CURRENT_STATE(status) == R1_STATE_PRG));
1032 #if defined(CONFIG_SDMMC_RK29) && !defined(CONFIG_SDMMC_RK29_OLD)
1033 if (brq.sbc.error || brq.cmd.error || brq.stop.error || brq.data.error) { //modifyed by xbw at 2011-11-17
1035 if (brq.data.error) {
1036 pr_err("%s: error %d transferring data, sector %u, nr %u, cmd response %#x, card status %#x\n",
1037 req->rq_disk->disk_name, brq.data.error,
1038 (unsigned)blk_rq_pos(req),
1039 (unsigned)blk_rq_sectors(req),
1040 brq.cmd.resp[0], brq.stop.resp[0]);
1042 if (rq_data_dir(req) == READ) {
1043 #if defined(CONFIG_SDMMC_RK29) && !defined(CONFIG_SDMMC_RK29_OLD)
1044 //direct to exit when error happen; deleted by xbw at 2011-12-14
1046 if (brq.data.blocks > 1) {
1047 /* Redo read one sector at a time */
1048 pr_warning("%s: retrying using single block read\n",
1049 req->rq_disk->disk_name);
1056 * After an error, we redo I/O one sector at a
1057 * time, so we only reach here after trying to
1058 * read a single sector.
1060 spin_lock_irq(&md->lock);
1061 ret = __blk_end_request(req, -EIO, brq.data.blksz);
1062 spin_unlock_irq(&md->lock);
1070 * A block was successfully transferred.
1072 spin_lock_irq(&md->lock);
1073 ret = __blk_end_request(req, 0, brq.data.bytes_xfered);
1074 spin_unlock_irq(&md->lock);
1081 * If this is an SD card and we're writing, we can first
1082 * mark the known good sectors as ok.
1084 * If the card is not SD, we can still ok written sectors
1085 * as reported by the controller (which might be less than
1086 * the real number of written sectors, but never more).
1088 if (mmc_card_sd(card)) {
1091 blocks = mmc_sd_num_wr_blocks(card);
1092 if (blocks != (u32)-1) {
1093 spin_lock_irq(&md->lock);
1094 ret = __blk_end_request(req, 0, blocks << 9);
1095 spin_unlock_irq(&md->lock);
1098 spin_lock_irq(&md->lock);
1099 ret = __blk_end_request(req, 0, brq.data.bytes_xfered);
1100 spin_unlock_irq(&md->lock);
1104 spin_lock_irq(&md->lock);
1106 ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req));
1107 spin_unlock_irq(&md->lock);
1113 mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card);
1115 static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
1118 struct mmc_blk_data *md = mq->data;
1119 struct mmc_card *card = md->queue.card;
1121 #ifdef CONFIG_MMC_BLOCK_DEFERRED_RESUME
1122 if (mmc_bus_needs_resume(card->host)) {
1123 mmc_resume_bus(card->host);
1124 mmc_blk_set_blksize(md, card);
1128 mmc_claim_host(card->host);
1129 ret = mmc_blk_part_switch(card, md);
1135 if (req->cmd_flags & REQ_DISCARD) {
1136 if (req->cmd_flags & REQ_SECURE)
1137 ret = mmc_blk_issue_secdiscard_rq(mq, req);
1139 ret = mmc_blk_issue_discard_rq(mq, req);
1140 } else if (req->cmd_flags & REQ_FLUSH) {
1141 ret = mmc_blk_issue_flush(mq, req);
1143 ret = mmc_blk_issue_rw_rq(mq, req);
1147 mmc_release_host(card->host);
1151 static inline int mmc_blk_readonly(struct mmc_card *card)
1153 return mmc_card_readonly(card) ||
1154 !(card->csd.cmdclass & CCC_BLOCK_WRITE);
1157 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
1158 struct device *parent,
1161 const char *subname)
1163 struct mmc_blk_data *md;
1166 devidx = find_first_zero_bit(dev_use, max_devices);
1167 if (devidx >= max_devices)
1168 return ERR_PTR(-ENOSPC);
1169 __set_bit(devidx, dev_use);
1171 md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
1178 * !subname implies we are creating main mmc_blk_data that will be
1179 * associated with mmc_card with mmc_set_drvdata. Due to device
1180 * partitions, devidx will not coincide with a per-physical card
1181 * index anymore so we keep track of a name index.
1184 md->name_idx = find_first_zero_bit(name_use, max_devices);
1185 __set_bit(md->name_idx, name_use);
1188 md->name_idx = ((struct mmc_blk_data *)
1189 dev_to_disk(parent)->private_data)->name_idx;
1192 * Set the read-only status based on the supported commands
1193 * and the write protect switch.
1195 md->read_only = mmc_blk_readonly(card);
1197 md->disk = alloc_disk(perdev_minors);
1198 if (md->disk == NULL) {
1203 spin_lock_init(&md->lock);
1204 INIT_LIST_HEAD(&md->part);
1207 ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
1211 md->queue.issue_fn = mmc_blk_issue_rq;
1212 md->queue.data = md;
1214 md->disk->major = MMC_BLOCK_MAJOR;
1215 md->disk->first_minor = devidx * perdev_minors;
1216 md->disk->fops = &mmc_bdops;
1217 md->disk->private_data = md;
1218 md->disk->queue = md->queue.queue;
1219 md->disk->driverfs_dev = parent;
1220 set_disk_ro(md->disk, md->read_only || default_ro);
1221 md->disk->flags = GENHD_FL_EXT_DEVT;
1224 * As discussed on lkml, GENHD_FL_REMOVABLE should:
1226 * - be set for removable media with permanent block devices
1227 * - be unset for removable block devices with permanent media
1229 * Since MMC block devices clearly fall under the second
1230 * case, we do not set GENHD_FL_REMOVABLE. Userspace
1231 * should use the block device creation/destruction hotplug
1232 * messages to tell when the card is present.
1235 snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
1236 "mmcblk%d%s", md->name_idx, subname ? subname : "");
1238 blk_queue_logical_block_size(md->queue.queue, 512);
1239 set_capacity(md->disk, size);
1241 if (mmc_host_cmd23(card->host)) {
1242 if (mmc_card_mmc(card) ||
1243 (mmc_card_sd(card) &&
1244 card->scr.cmds & SD_SCR_CMD23_SUPPORT))
1245 md->flags |= MMC_BLK_CMD23;
1248 if (mmc_card_mmc(card) &&
1249 md->flags & MMC_BLK_CMD23 &&
1250 ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
1251 card->ext_csd.rel_sectors)) {
1252 md->flags |= MMC_BLK_REL_WR;
1253 blk_queue_flush(md->queue.queue, REQ_FLUSH | REQ_FUA);
1263 return ERR_PTR(ret);
1266 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
1269 struct mmc_blk_data *md;
1271 if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
1273 * The EXT_CSD sector count is in number or 512 byte
1276 size = card->ext_csd.sectors;
1279 * The CSD capacity field is in units of read_blkbits.
1280 * set_capacity takes units of 512 bytes.
1282 size = card->csd.capacity << (card->csd.read_blkbits - 9);
1285 md = mmc_blk_alloc_req(card, &card->dev, size, false, NULL);
1289 static int mmc_blk_alloc_part(struct mmc_card *card,
1290 struct mmc_blk_data *md,
1291 unsigned int part_type,
1294 const char *subname)
1297 struct mmc_blk_data *part_md;
1299 part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
1301 if (IS_ERR(part_md))
1302 return PTR_ERR(part_md);
1303 part_md->part_type = part_type;
1304 list_add(&part_md->part, &md->part);
1306 string_get_size((u64)get_capacity(part_md->disk) << 9, STRING_UNITS_2,
1307 cap_str, sizeof(cap_str));
1308 printk(KERN_INFO "%s: %s %s partition %u %s\n",
1309 part_md->disk->disk_name, mmc_card_id(card),
1310 mmc_card_name(card), part_md->part_type, cap_str);
1314 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
1318 if (!mmc_card_mmc(card))
1321 if (card->ext_csd.boot_size) {
1322 ret = mmc_blk_alloc_part(card, md, EXT_CSD_PART_CONFIG_ACC_BOOT0,
1323 card->ext_csd.boot_size >> 9,
1328 ret = mmc_blk_alloc_part(card, md, EXT_CSD_PART_CONFIG_ACC_BOOT1,
1329 card->ext_csd.boot_size >> 9,
1340 mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card)
1344 mmc_claim_host(card->host);
1345 err = mmc_set_blocklen(card, 512);
1346 mmc_release_host(card->host);
1349 printk(KERN_ERR "%s: unable to set block size to 512: %d\n",
1350 md->disk->disk_name, err);
1357 static void mmc_blk_remove_req(struct mmc_blk_data *md)
1360 if (md->disk->flags & GENHD_FL_UP) {
1361 device_remove_file(disk_to_dev(md->disk), &md->force_ro);
1363 /* Stop new requests from getting into the queue */
1364 del_gendisk(md->disk);
1367 /* Then flush out any already in there */
1368 mmc_cleanup_queue(&md->queue);
1373 static void mmc_blk_remove_parts(struct mmc_card *card,
1374 struct mmc_blk_data *md)
1376 struct list_head *pos, *q;
1377 struct mmc_blk_data *part_md;
1379 __clear_bit(md->name_idx, name_use);
1380 list_for_each_safe(pos, q, &md->part) {
1381 part_md = list_entry(pos, struct mmc_blk_data, part);
1383 mmc_blk_remove_req(part_md);
1387 static int mmc_add_disk(struct mmc_blk_data *md)
1392 md->force_ro.show = force_ro_show;
1393 md->force_ro.store = force_ro_store;
1394 sysfs_attr_init(&md->force_ro.attr);
1395 md->force_ro.attr.name = "force_ro";
1396 md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
1397 ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
1399 del_gendisk(md->disk);
1404 static const struct mmc_fixup blk_fixups[] =
1406 MMC_FIXUP("SEM02G", 0x2, 0x100, add_quirk, MMC_QUIRK_INAND_CMD38),
1407 MMC_FIXUP("SEM04G", 0x2, 0x100, add_quirk, MMC_QUIRK_INAND_CMD38),
1408 MMC_FIXUP("SEM08G", 0x2, 0x100, add_quirk, MMC_QUIRK_INAND_CMD38),
1409 MMC_FIXUP("SEM16G", 0x2, 0x100, add_quirk, MMC_QUIRK_INAND_CMD38),
1410 MMC_FIXUP("SEM32G", 0x2, 0x100, add_quirk, MMC_QUIRK_INAND_CMD38),
1413 * Some MMC cards experience performance degradation with CMD23
1414 * instead of CMD12-bounded multiblock transfers. For now we'll
1415 * black list what's bad...
1416 * - Certain Toshiba cards.
1418 * N.B. This doesn't affect SD cards.
1420 MMC_FIXUP("MMC08G", 0x11, CID_OEMID_ANY, add_quirk_mmc,
1421 MMC_QUIRK_BLK_NO_CMD23),
1422 MMC_FIXUP("MMC16G", 0x11, CID_OEMID_ANY, add_quirk_mmc,
1423 MMC_QUIRK_BLK_NO_CMD23),
1424 MMC_FIXUP("MMC32G", 0x11, CID_OEMID_ANY, add_quirk_mmc,
1425 MMC_QUIRK_BLK_NO_CMD23),
1429 static int mmc_blk_probe(struct mmc_card *card)
1431 struct mmc_blk_data *md, *part_md;
1436 * Check that the card supports the command class(es) we need.
1438 if (!(card->csd.cmdclass & CCC_BLOCK_READ))
1441 md = mmc_blk_alloc(card);
1445 err = mmc_blk_set_blksize(md, card);
1449 string_get_size((u64)get_capacity(md->disk) << 9, STRING_UNITS_2,
1450 cap_str, sizeof(cap_str));
1451 printk(KERN_INFO "%s: %s %s %s %s\n",
1452 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
1453 cap_str, md->read_only ? "(ro)" : "");
1455 if (mmc_blk_alloc_parts(card, md))
1458 mmc_set_drvdata(card, md);
1459 mmc_fixup_device(card, blk_fixups);
1461 #ifdef CONFIG_MMC_BLOCK_DEFERRED_RESUME
1462 mmc_set_bus_resume_policy(card->host, 1);
1464 if (mmc_add_disk(md))
1467 list_for_each_entry(part_md, &md->part, part) {
1468 if (mmc_add_disk(part_md))
1474 mmc_blk_remove_parts(card, md);
1475 mmc_blk_remove_req(md);
1479 static void mmc_blk_remove(struct mmc_card *card)
1481 struct mmc_blk_data *md = mmc_get_drvdata(card);
1483 mmc_blk_remove_parts(card, md);
1484 mmc_claim_host(card->host);
1485 mmc_blk_part_switch(card, md);
1486 mmc_release_host(card->host);
1487 mmc_blk_remove_req(md);
1488 mmc_set_drvdata(card, NULL);
1489 #ifdef CONFIG_MMC_BLOCK_DEFERRED_RESUME
1490 mmc_set_bus_resume_policy(card->host, 0);
1495 static int mmc_blk_suspend(struct mmc_card *card, pm_message_t state)
1497 struct mmc_blk_data *part_md;
1498 struct mmc_blk_data *md = mmc_get_drvdata(card);
1501 mmc_queue_suspend(&md->queue);
1502 list_for_each_entry(part_md, &md->part, part) {
1503 mmc_queue_suspend(&part_md->queue);
1509 static int mmc_blk_resume(struct mmc_card *card)
1511 struct mmc_blk_data *part_md;
1512 struct mmc_blk_data *md = mmc_get_drvdata(card);
1515 #ifndef CONFIG_MMC_BLOCK_DEFERRED_RESUME
1516 mmc_blk_set_blksize(md, card);
1520 * Resume involves the card going into idle state,
1521 * so current partition is always the main one.
1523 md->part_curr = md->part_type;
1524 mmc_queue_resume(&md->queue);
1525 list_for_each_entry(part_md, &md->part, part) {
1526 mmc_queue_resume(&part_md->queue);
1532 #define mmc_blk_suspend NULL
1533 #define mmc_blk_resume NULL
1536 static struct mmc_driver mmc_driver = {
1540 .probe = mmc_blk_probe,
1541 .remove = mmc_blk_remove,
1542 .suspend = mmc_blk_suspend,
1543 .resume = mmc_blk_resume,
1546 static int __init mmc_blk_init(void)
1550 if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
1551 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
1553 max_devices = 256 / perdev_minors;
1555 res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
1559 res = mmc_register_driver(&mmc_driver);
1565 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
1570 static void __exit mmc_blk_exit(void)
1572 mmc_unregister_driver(&mmc_driver);
1573 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
1576 module_init(mmc_blk_init);
1577 module_exit(mmc_blk_exit);
1579 MODULE_LICENSE("GPL");
1580 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");