uwb: Use kcalloc instead of kzalloc to allocate array
[zen-stable.git] / drivers / mmc / card / block.c
bloba1cb21f95302c497157dc97ed85f9acd68a3c10d
1 /*
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
18 * 28 May 2002
20 #include <linux/moduleparam.h>
21 #include <linux/module.h>
22 #include <linux/init.h>
24 #include <linux/kernel.h>
25 #include <linux/fs.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>
47 #include "queue.h"
49 MODULE_ALIAS("mmc:block");
50 #ifdef MODULE_PARAM_PREFIX
51 #undef MODULE_PARAM_PREFIX
52 #endif
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
66 * or bootarg options.
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.
83 struct mmc_blk_data {
84 spinlock_t lock;
85 struct gendisk *disk;
86 struct mmc_queue queue;
87 struct list_head part;
89 unsigned int flags;
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 */
93 unsigned int usage;
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;
112 static DEFINE_MUTEX(open_lock);
114 enum mmc_blk_status {
115 MMC_BLK_SUCCESS = 0,
116 MMC_BLK_PARTIAL,
117 MMC_BLK_CMD_ERR,
118 MMC_BLK_RETRY,
119 MMC_BLK_ABORT,
120 MMC_BLK_DATA_ERR,
121 MMC_BLK_ECC_ERR,
124 module_param(perdev_minors, int, 0444);
125 MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
127 static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
129 struct mmc_blk_data *md;
131 mutex_lock(&open_lock);
132 md = disk->private_data;
133 if (md && md->usage == 0)
134 md = NULL;
135 if (md)
136 md->usage++;
137 mutex_unlock(&open_lock);
139 return md;
142 static inline int mmc_get_devidx(struct gendisk *disk)
144 int devmaj = MAJOR(disk_devt(disk));
145 int devidx = MINOR(disk_devt(disk)) / perdev_minors;
147 if (!devmaj)
148 devidx = disk->first_minor / perdev_minors;
149 return devidx;
152 static void mmc_blk_put(struct mmc_blk_data *md)
154 mutex_lock(&open_lock);
155 md->usage--;
156 if (md->usage == 0) {
157 int devidx = mmc_get_devidx(md->disk);
158 blk_cleanup_queue(md->queue.queue);
160 __clear_bit(devidx, dev_use);
162 put_disk(md->disk);
163 kfree(md);
165 mutex_unlock(&open_lock);
168 static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
169 char *buf)
171 int ret;
172 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
174 ret = snprintf(buf, PAGE_SIZE, "%d",
175 get_disk_ro(dev_to_disk(dev)) ^
176 md->read_only);
177 mmc_blk_put(md);
178 return ret;
181 static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
182 const char *buf, size_t count)
184 int ret;
185 char *end;
186 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
187 unsigned long set = simple_strtoul(buf, &end, 0);
188 if (end == buf) {
189 ret = -EINVAL;
190 goto out;
193 set_disk_ro(dev_to_disk(dev), set || md->read_only);
194 ret = count;
195 out:
196 mmc_blk_put(md);
197 return ret;
200 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
202 struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
203 int ret = -ENXIO;
205 mutex_lock(&block_mutex);
206 if (md) {
207 if (md->usage == 2)
208 check_disk_change(bdev);
209 ret = 0;
211 if ((mode & FMODE_WRITE) && md->read_only) {
212 mmc_blk_put(md);
213 ret = -EROFS;
216 mutex_unlock(&block_mutex);
218 return ret;
221 static int mmc_blk_release(struct gendisk *disk, fmode_t mode)
223 struct mmc_blk_data *md = disk->private_data;
225 mutex_lock(&block_mutex);
226 mmc_blk_put(md);
227 mutex_unlock(&block_mutex);
228 return 0;
231 static int
232 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
234 geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
235 geo->heads = 4;
236 geo->sectors = 16;
237 return 0;
240 struct mmc_blk_ioc_data {
241 struct mmc_ioc_cmd ic;
242 unsigned char *buf;
243 u64 buf_bytes;
246 static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
247 struct mmc_ioc_cmd __user *user)
249 struct mmc_blk_ioc_data *idata;
250 int err;
252 idata = kzalloc(sizeof(*idata), GFP_KERNEL);
253 if (!idata) {
254 err = -ENOMEM;
255 goto out;
258 if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
259 err = -EFAULT;
260 goto idata_err;
263 idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
264 if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
265 err = -EOVERFLOW;
266 goto idata_err;
269 idata->buf = kzalloc(idata->buf_bytes, GFP_KERNEL);
270 if (!idata->buf) {
271 err = -ENOMEM;
272 goto idata_err;
275 if (copy_from_user(idata->buf, (void __user *)(unsigned long)
276 idata->ic.data_ptr, idata->buf_bytes)) {
277 err = -EFAULT;
278 goto copy_err;
281 return idata;
283 copy_err:
284 kfree(idata->buf);
285 idata_err:
286 kfree(idata);
287 out:
288 return ERR_PTR(err);
291 static int mmc_blk_ioctl_cmd(struct block_device *bdev,
292 struct mmc_ioc_cmd __user *ic_ptr)
294 struct mmc_blk_ioc_data *idata;
295 struct mmc_blk_data *md;
296 struct mmc_card *card;
297 struct mmc_command cmd = {0};
298 struct mmc_data data = {0};
299 struct mmc_request mrq = {NULL};
300 struct scatterlist sg;
301 int err;
304 * The caller must have CAP_SYS_RAWIO, and must be calling this on the
305 * whole block device, not on a partition. This prevents overspray
306 * between sibling partitions.
308 if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
309 return -EPERM;
311 idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
312 if (IS_ERR(idata))
313 return PTR_ERR(idata);
315 cmd.opcode = idata->ic.opcode;
316 cmd.arg = idata->ic.arg;
317 cmd.flags = idata->ic.flags;
319 data.sg = &sg;
320 data.sg_len = 1;
321 data.blksz = idata->ic.blksz;
322 data.blocks = idata->ic.blocks;
324 sg_init_one(data.sg, idata->buf, idata->buf_bytes);
326 if (idata->ic.write_flag)
327 data.flags = MMC_DATA_WRITE;
328 else
329 data.flags = MMC_DATA_READ;
331 mrq.cmd = &cmd;
332 mrq.data = &data;
334 md = mmc_blk_get(bdev->bd_disk);
335 if (!md) {
336 err = -EINVAL;
337 goto cmd_done;
340 card = md->queue.card;
341 if (IS_ERR(card)) {
342 err = PTR_ERR(card);
343 goto cmd_done;
346 mmc_claim_host(card->host);
348 if (idata->ic.is_acmd) {
349 err = mmc_app_cmd(card->host, card);
350 if (err)
351 goto cmd_rel_host;
354 /* data.flags must already be set before doing this. */
355 mmc_set_data_timeout(&data, card);
356 /* Allow overriding the timeout_ns for empirical tuning. */
357 if (idata->ic.data_timeout_ns)
358 data.timeout_ns = idata->ic.data_timeout_ns;
360 if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
362 * Pretend this is a data transfer and rely on the host driver
363 * to compute timeout. When all host drivers support
364 * cmd.cmd_timeout for R1B, this can be changed to:
366 * mrq.data = NULL;
367 * cmd.cmd_timeout = idata->ic.cmd_timeout_ms;
369 data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000;
372 mmc_wait_for_req(card->host, &mrq);
374 if (cmd.error) {
375 dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
376 __func__, cmd.error);
377 err = cmd.error;
378 goto cmd_rel_host;
380 if (data.error) {
381 dev_err(mmc_dev(card->host), "%s: data error %d\n",
382 __func__, data.error);
383 err = data.error;
384 goto cmd_rel_host;
388 * According to the SD specs, some commands require a delay after
389 * issuing the command.
391 if (idata->ic.postsleep_min_us)
392 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
394 if (copy_to_user(&(ic_ptr->response), cmd.resp, sizeof(cmd.resp))) {
395 err = -EFAULT;
396 goto cmd_rel_host;
399 if (!idata->ic.write_flag) {
400 if (copy_to_user((void __user *)(unsigned long) idata->ic.data_ptr,
401 idata->buf, idata->buf_bytes)) {
402 err = -EFAULT;
403 goto cmd_rel_host;
407 cmd_rel_host:
408 mmc_release_host(card->host);
410 cmd_done:
411 mmc_blk_put(md);
412 kfree(idata->buf);
413 kfree(idata);
414 return err;
417 static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
418 unsigned int cmd, unsigned long arg)
420 int ret = -EINVAL;
421 if (cmd == MMC_IOC_CMD)
422 ret = mmc_blk_ioctl_cmd(bdev, (struct mmc_ioc_cmd __user *)arg);
423 return ret;
426 #ifdef CONFIG_COMPAT
427 static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
428 unsigned int cmd, unsigned long arg)
430 return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
432 #endif
434 static const struct block_device_operations mmc_bdops = {
435 .open = mmc_blk_open,
436 .release = mmc_blk_release,
437 .getgeo = mmc_blk_getgeo,
438 .owner = THIS_MODULE,
439 .ioctl = mmc_blk_ioctl,
440 #ifdef CONFIG_COMPAT
441 .compat_ioctl = mmc_blk_compat_ioctl,
442 #endif
445 static inline int mmc_blk_part_switch(struct mmc_card *card,
446 struct mmc_blk_data *md)
448 int ret;
449 struct mmc_blk_data *main_md = mmc_get_drvdata(card);
451 if (main_md->part_curr == md->part_type)
452 return 0;
454 if (mmc_card_mmc(card)) {
455 u8 part_config = card->ext_csd.part_config;
457 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
458 part_config |= md->part_type;
460 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
461 EXT_CSD_PART_CONFIG, part_config,
462 card->ext_csd.part_time);
463 if (ret)
464 return ret;
466 card->ext_csd.part_config = part_config;
469 main_md->part_curr = md->part_type;
470 return 0;
473 static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
475 int err;
476 u32 result;
477 __be32 *blocks;
479 struct mmc_request mrq = {NULL};
480 struct mmc_command cmd = {0};
481 struct mmc_data data = {0};
482 unsigned int timeout_us;
484 struct scatterlist sg;
486 cmd.opcode = MMC_APP_CMD;
487 cmd.arg = card->rca << 16;
488 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
490 err = mmc_wait_for_cmd(card->host, &cmd, 0);
491 if (err)
492 return (u32)-1;
493 if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
494 return (u32)-1;
496 memset(&cmd, 0, sizeof(struct mmc_command));
498 cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
499 cmd.arg = 0;
500 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
502 data.timeout_ns = card->csd.tacc_ns * 100;
503 data.timeout_clks = card->csd.tacc_clks * 100;
505 timeout_us = data.timeout_ns / 1000;
506 timeout_us += data.timeout_clks * 1000 /
507 (card->host->ios.clock / 1000);
509 if (timeout_us > 100000) {
510 data.timeout_ns = 100000000;
511 data.timeout_clks = 0;
514 data.blksz = 4;
515 data.blocks = 1;
516 data.flags = MMC_DATA_READ;
517 data.sg = &sg;
518 data.sg_len = 1;
520 mrq.cmd = &cmd;
521 mrq.data = &data;
523 blocks = kmalloc(4, GFP_KERNEL);
524 if (!blocks)
525 return (u32)-1;
527 sg_init_one(&sg, blocks, 4);
529 mmc_wait_for_req(card->host, &mrq);
531 result = ntohl(*blocks);
532 kfree(blocks);
534 if (cmd.error || data.error)
535 result = (u32)-1;
537 return result;
540 static int send_stop(struct mmc_card *card, u32 *status)
542 struct mmc_command cmd = {0};
543 int err;
545 cmd.opcode = MMC_STOP_TRANSMISSION;
546 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
547 err = mmc_wait_for_cmd(card->host, &cmd, 5);
548 if (err == 0)
549 *status = cmd.resp[0];
550 return err;
553 static int get_card_status(struct mmc_card *card, u32 *status, int retries)
555 struct mmc_command cmd = {0};
556 int err;
558 cmd.opcode = MMC_SEND_STATUS;
559 if (!mmc_host_is_spi(card->host))
560 cmd.arg = card->rca << 16;
561 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
562 err = mmc_wait_for_cmd(card->host, &cmd, retries);
563 if (err == 0)
564 *status = cmd.resp[0];
565 return err;
568 #define ERR_RETRY 2
569 #define ERR_ABORT 1
570 #define ERR_CONTINUE 0
572 static int mmc_blk_cmd_error(struct request *req, const char *name, int error,
573 bool status_valid, u32 status)
575 switch (error) {
576 case -EILSEQ:
577 /* response crc error, retry the r/w cmd */
578 pr_err("%s: %s sending %s command, card status %#x\n",
579 req->rq_disk->disk_name, "response CRC error",
580 name, status);
581 return ERR_RETRY;
583 case -ETIMEDOUT:
584 pr_err("%s: %s sending %s command, card status %#x\n",
585 req->rq_disk->disk_name, "timed out", name, status);
587 /* If the status cmd initially failed, retry the r/w cmd */
588 if (!status_valid)
589 return ERR_RETRY;
592 * If it was a r/w cmd crc error, or illegal command
593 * (eg, issued in wrong state) then retry - we should
594 * have corrected the state problem above.
596 if (status & (R1_COM_CRC_ERROR | R1_ILLEGAL_COMMAND))
597 return ERR_RETRY;
599 /* Otherwise abort the command */
600 return ERR_ABORT;
602 default:
603 /* We don't understand the error code the driver gave us */
604 pr_err("%s: unknown error %d sending read/write command, card status %#x\n",
605 req->rq_disk->disk_name, error, status);
606 return ERR_ABORT;
611 * Initial r/w and stop cmd error recovery.
612 * We don't know whether the card received the r/w cmd or not, so try to
613 * restore things back to a sane state. Essentially, we do this as follows:
614 * - Obtain card status. If the first attempt to obtain card status fails,
615 * the status word will reflect the failed status cmd, not the failed
616 * r/w cmd. If we fail to obtain card status, it suggests we can no
617 * longer communicate with the card.
618 * - Check the card state. If the card received the cmd but there was a
619 * transient problem with the response, it might still be in a data transfer
620 * mode. Try to send it a stop command. If this fails, we can't recover.
621 * - If the r/w cmd failed due to a response CRC error, it was probably
622 * transient, so retry the cmd.
623 * - If the r/w cmd timed out, but we didn't get the r/w cmd status, retry.
624 * - If the r/w cmd timed out, and the r/w cmd failed due to CRC error or
625 * illegal cmd, retry.
626 * Otherwise we don't understand what happened, so abort.
628 static int mmc_blk_cmd_recovery(struct mmc_card *card, struct request *req,
629 struct mmc_blk_request *brq, int *ecc_err)
631 bool prev_cmd_status_valid = true;
632 u32 status, stop_status = 0;
633 int err, retry;
636 * Try to get card status which indicates both the card state
637 * and why there was no response. If the first attempt fails,
638 * we can't be sure the returned status is for the r/w command.
640 for (retry = 2; retry >= 0; retry--) {
641 err = get_card_status(card, &status, 0);
642 if (!err)
643 break;
645 prev_cmd_status_valid = false;
646 pr_err("%s: error %d sending status command, %sing\n",
647 req->rq_disk->disk_name, err, retry ? "retry" : "abort");
650 /* We couldn't get a response from the card. Give up. */
651 if (err)
652 return ERR_ABORT;
654 /* Flag ECC errors */
655 if ((status & R1_CARD_ECC_FAILED) ||
656 (brq->stop.resp[0] & R1_CARD_ECC_FAILED) ||
657 (brq->cmd.resp[0] & R1_CARD_ECC_FAILED))
658 *ecc_err = 1;
661 * Check the current card state. If it is in some data transfer
662 * mode, tell it to stop (and hopefully transition back to TRAN.)
664 if (R1_CURRENT_STATE(status) == R1_STATE_DATA ||
665 R1_CURRENT_STATE(status) == R1_STATE_RCV) {
666 err = send_stop(card, &stop_status);
667 if (err)
668 pr_err("%s: error %d sending stop command\n",
669 req->rq_disk->disk_name, err);
672 * If the stop cmd also timed out, the card is probably
673 * not present, so abort. Other errors are bad news too.
675 if (err)
676 return ERR_ABORT;
677 if (stop_status & R1_CARD_ECC_FAILED)
678 *ecc_err = 1;
681 /* Check for set block count errors */
682 if (brq->sbc.error)
683 return mmc_blk_cmd_error(req, "SET_BLOCK_COUNT", brq->sbc.error,
684 prev_cmd_status_valid, status);
686 /* Check for r/w command errors */
687 if (brq->cmd.error)
688 return mmc_blk_cmd_error(req, "r/w cmd", brq->cmd.error,
689 prev_cmd_status_valid, status);
691 /* Data errors */
692 if (!brq->stop.error)
693 return ERR_CONTINUE;
695 /* Now for stop errors. These aren't fatal to the transfer. */
696 pr_err("%s: error %d sending stop command, original cmd response %#x, card status %#x\n",
697 req->rq_disk->disk_name, brq->stop.error,
698 brq->cmd.resp[0], status);
701 * Subsitute in our own stop status as this will give the error
702 * state which happened during the execution of the r/w command.
704 if (stop_status) {
705 brq->stop.resp[0] = stop_status;
706 brq->stop.error = 0;
708 return ERR_CONTINUE;
711 static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
712 int type)
714 int err;
716 if (md->reset_done & type)
717 return -EEXIST;
719 md->reset_done |= type;
720 err = mmc_hw_reset(host);
721 /* Ensure we switch back to the correct partition */
722 if (err != -EOPNOTSUPP) {
723 struct mmc_blk_data *main_md = mmc_get_drvdata(host->card);
724 int part_err;
726 main_md->part_curr = main_md->part_type;
727 part_err = mmc_blk_part_switch(host->card, md);
728 if (part_err) {
730 * We have failed to get back into the correct
731 * partition, so we need to abort the whole request.
733 return -ENODEV;
736 return err;
739 static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
741 md->reset_done &= ~type;
744 static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
746 struct mmc_blk_data *md = mq->data;
747 struct mmc_card *card = md->queue.card;
748 unsigned int from, nr, arg;
749 int err = 0, type = MMC_BLK_DISCARD;
751 if (!mmc_can_erase(card)) {
752 err = -EOPNOTSUPP;
753 goto out;
756 from = blk_rq_pos(req);
757 nr = blk_rq_sectors(req);
759 if (mmc_can_discard(card))
760 arg = MMC_DISCARD_ARG;
761 else if (mmc_can_trim(card))
762 arg = MMC_TRIM_ARG;
763 else
764 arg = MMC_ERASE_ARG;
765 retry:
766 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
767 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
768 INAND_CMD38_ARG_EXT_CSD,
769 arg == MMC_TRIM_ARG ?
770 INAND_CMD38_ARG_TRIM :
771 INAND_CMD38_ARG_ERASE,
773 if (err)
774 goto out;
776 err = mmc_erase(card, from, nr, arg);
777 out:
778 if (err == -EIO && !mmc_blk_reset(md, card->host, type))
779 goto retry;
780 if (!err)
781 mmc_blk_reset_success(md, type);
782 spin_lock_irq(&md->lock);
783 __blk_end_request(req, err, blk_rq_bytes(req));
784 spin_unlock_irq(&md->lock);
786 return err ? 0 : 1;
789 static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
790 struct request *req)
792 struct mmc_blk_data *md = mq->data;
793 struct mmc_card *card = md->queue.card;
794 unsigned int from, nr, arg;
795 int err = 0, type = MMC_BLK_SECDISCARD;
797 if (!(mmc_can_secure_erase_trim(card) || mmc_can_sanitize(card))) {
798 err = -EOPNOTSUPP;
799 goto out;
802 /* The sanitize operation is supported at v4.5 only */
803 if (mmc_can_sanitize(card)) {
804 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
805 EXT_CSD_SANITIZE_START, 1, 0);
806 goto out;
809 from = blk_rq_pos(req);
810 nr = blk_rq_sectors(req);
812 if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
813 arg = MMC_SECURE_TRIM1_ARG;
814 else
815 arg = MMC_SECURE_ERASE_ARG;
816 retry:
817 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
818 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
819 INAND_CMD38_ARG_EXT_CSD,
820 arg == MMC_SECURE_TRIM1_ARG ?
821 INAND_CMD38_ARG_SECTRIM1 :
822 INAND_CMD38_ARG_SECERASE,
824 if (err)
825 goto out;
827 err = mmc_erase(card, from, nr, arg);
828 if (!err && arg == MMC_SECURE_TRIM1_ARG) {
829 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
830 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
831 INAND_CMD38_ARG_EXT_CSD,
832 INAND_CMD38_ARG_SECTRIM2,
834 if (err)
835 goto out;
837 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
839 out:
840 if (err == -EIO && !mmc_blk_reset(md, card->host, type))
841 goto retry;
842 if (!err)
843 mmc_blk_reset_success(md, type);
844 spin_lock_irq(&md->lock);
845 __blk_end_request(req, err, blk_rq_bytes(req));
846 spin_unlock_irq(&md->lock);
848 return err ? 0 : 1;
851 static int mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
853 struct mmc_blk_data *md = mq->data;
854 struct mmc_card *card = md->queue.card;
855 int ret = 0;
857 ret = mmc_flush_cache(card);
858 if (ret)
859 ret = -EIO;
861 spin_lock_irq(&md->lock);
862 __blk_end_request_all(req, ret);
863 spin_unlock_irq(&md->lock);
865 return ret ? 0 : 1;
869 * Reformat current write as a reliable write, supporting
870 * both legacy and the enhanced reliable write MMC cards.
871 * In each transfer we'll handle only as much as a single
872 * reliable write can handle, thus finish the request in
873 * partial completions.
875 static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
876 struct mmc_card *card,
877 struct request *req)
879 if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
880 /* Legacy mode imposes restrictions on transfers. */
881 if (!IS_ALIGNED(brq->cmd.arg, card->ext_csd.rel_sectors))
882 brq->data.blocks = 1;
884 if (brq->data.blocks > card->ext_csd.rel_sectors)
885 brq->data.blocks = card->ext_csd.rel_sectors;
886 else if (brq->data.blocks < card->ext_csd.rel_sectors)
887 brq->data.blocks = 1;
891 #define CMD_ERRORS \
892 (R1_OUT_OF_RANGE | /* Command argument out of range */ \
893 R1_ADDRESS_ERROR | /* Misaligned address */ \
894 R1_BLOCK_LEN_ERROR | /* Transferred block length incorrect */\
895 R1_WP_VIOLATION | /* Tried to write to protected block */ \
896 R1_CC_ERROR | /* Card controller error */ \
897 R1_ERROR) /* General/unknown error */
899 static int mmc_blk_err_check(struct mmc_card *card,
900 struct mmc_async_req *areq)
902 struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
903 mmc_active);
904 struct mmc_blk_request *brq = &mq_mrq->brq;
905 struct request *req = mq_mrq->req;
906 int ecc_err = 0;
909 * sbc.error indicates a problem with the set block count
910 * command. No data will have been transferred.
912 * cmd.error indicates a problem with the r/w command. No
913 * data will have been transferred.
915 * stop.error indicates a problem with the stop command. Data
916 * may have been transferred, or may still be transferring.
918 if (brq->sbc.error || brq->cmd.error || brq->stop.error ||
919 brq->data.error) {
920 switch (mmc_blk_cmd_recovery(card, req, brq, &ecc_err)) {
921 case ERR_RETRY:
922 return MMC_BLK_RETRY;
923 case ERR_ABORT:
924 return MMC_BLK_ABORT;
925 case ERR_CONTINUE:
926 break;
931 * Check for errors relating to the execution of the
932 * initial command - such as address errors. No data
933 * has been transferred.
935 if (brq->cmd.resp[0] & CMD_ERRORS) {
936 pr_err("%s: r/w command failed, status = %#x\n",
937 req->rq_disk->disk_name, brq->cmd.resp[0]);
938 return MMC_BLK_ABORT;
942 * Everything else is either success, or a data error of some
943 * kind. If it was a write, we may have transitioned to
944 * program mode, which we have to wait for it to complete.
946 if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
947 u32 status;
948 do {
949 int err = get_card_status(card, &status, 5);
950 if (err) {
951 pr_err("%s: error %d requesting status\n",
952 req->rq_disk->disk_name, err);
953 return MMC_BLK_CMD_ERR;
956 * Some cards mishandle the status bits,
957 * so make sure to check both the busy
958 * indication and the card state.
960 } while (!(status & R1_READY_FOR_DATA) ||
961 (R1_CURRENT_STATE(status) == R1_STATE_PRG));
964 if (brq->data.error) {
965 pr_err("%s: error %d transferring data, sector %u, nr %u, cmd response %#x, card status %#x\n",
966 req->rq_disk->disk_name, brq->data.error,
967 (unsigned)blk_rq_pos(req),
968 (unsigned)blk_rq_sectors(req),
969 brq->cmd.resp[0], brq->stop.resp[0]);
971 if (rq_data_dir(req) == READ) {
972 if (ecc_err)
973 return MMC_BLK_ECC_ERR;
974 return MMC_BLK_DATA_ERR;
975 } else {
976 return MMC_BLK_CMD_ERR;
980 if (!brq->data.bytes_xfered)
981 return MMC_BLK_RETRY;
983 if (blk_rq_bytes(req) != brq->data.bytes_xfered)
984 return MMC_BLK_PARTIAL;
986 return MMC_BLK_SUCCESS;
989 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
990 struct mmc_card *card,
991 int disable_multi,
992 struct mmc_queue *mq)
994 u32 readcmd, writecmd;
995 struct mmc_blk_request *brq = &mqrq->brq;
996 struct request *req = mqrq->req;
997 struct mmc_blk_data *md = mq->data;
1000 * Reliable writes are used to implement Forced Unit Access and
1001 * REQ_META accesses, and are supported only on MMCs.
1003 * XXX: this really needs a good explanation of why REQ_META
1004 * is treated special.
1006 bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
1007 (req->cmd_flags & REQ_META)) &&
1008 (rq_data_dir(req) == WRITE) &&
1009 (md->flags & MMC_BLK_REL_WR);
1011 memset(brq, 0, sizeof(struct mmc_blk_request));
1012 brq->mrq.cmd = &brq->cmd;
1013 brq->mrq.data = &brq->data;
1015 brq->cmd.arg = blk_rq_pos(req);
1016 if (!mmc_card_blockaddr(card))
1017 brq->cmd.arg <<= 9;
1018 brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1019 brq->data.blksz = 512;
1020 brq->stop.opcode = MMC_STOP_TRANSMISSION;
1021 brq->stop.arg = 0;
1022 brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1023 brq->data.blocks = blk_rq_sectors(req);
1026 * The block layer doesn't support all sector count
1027 * restrictions, so we need to be prepared for too big
1028 * requests.
1030 if (brq->data.blocks > card->host->max_blk_count)
1031 brq->data.blocks = card->host->max_blk_count;
1033 if (brq->data.blocks > 1) {
1035 * After a read error, we redo the request one sector
1036 * at a time in order to accurately determine which
1037 * sectors can be read successfully.
1039 if (disable_multi)
1040 brq->data.blocks = 1;
1042 /* Some controllers can't do multiblock reads due to hw bugs */
1043 if (card->host->caps2 & MMC_CAP2_NO_MULTI_READ &&
1044 rq_data_dir(req) == READ)
1045 brq->data.blocks = 1;
1048 if (brq->data.blocks > 1 || do_rel_wr) {
1049 /* SPI multiblock writes terminate using a special
1050 * token, not a STOP_TRANSMISSION request.
1052 if (!mmc_host_is_spi(card->host) ||
1053 rq_data_dir(req) == READ)
1054 brq->mrq.stop = &brq->stop;
1055 readcmd = MMC_READ_MULTIPLE_BLOCK;
1056 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1057 } else {
1058 brq->mrq.stop = NULL;
1059 readcmd = MMC_READ_SINGLE_BLOCK;
1060 writecmd = MMC_WRITE_BLOCK;
1062 if (rq_data_dir(req) == READ) {
1063 brq->cmd.opcode = readcmd;
1064 brq->data.flags |= MMC_DATA_READ;
1065 } else {
1066 brq->cmd.opcode = writecmd;
1067 brq->data.flags |= MMC_DATA_WRITE;
1070 if (do_rel_wr)
1071 mmc_apply_rel_rw(brq, card, req);
1074 * Pre-defined multi-block transfers are preferable to
1075 * open ended-ones (and necessary for reliable writes).
1076 * However, it is not sufficient to just send CMD23,
1077 * and avoid the final CMD12, as on an error condition
1078 * CMD12 (stop) needs to be sent anyway. This, coupled
1079 * with Auto-CMD23 enhancements provided by some
1080 * hosts, means that the complexity of dealing
1081 * with this is best left to the host. If CMD23 is
1082 * supported by card and host, we'll fill sbc in and let
1083 * the host deal with handling it correctly. This means
1084 * that for hosts that don't expose MMC_CAP_CMD23, no
1085 * change of behavior will be observed.
1087 * N.B: Some MMC cards experience perf degradation.
1088 * We'll avoid using CMD23-bounded multiblock writes for
1089 * these, while retaining features like reliable writes.
1092 if ((md->flags & MMC_BLK_CMD23) &&
1093 mmc_op_multi(brq->cmd.opcode) &&
1094 (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23))) {
1095 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1096 brq->sbc.arg = brq->data.blocks |
1097 (do_rel_wr ? (1 << 31) : 0);
1098 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1099 brq->mrq.sbc = &brq->sbc;
1102 mmc_set_data_timeout(&brq->data, card);
1104 brq->data.sg = mqrq->sg;
1105 brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1108 * Adjust the sg list so it is the same size as the
1109 * request.
1111 if (brq->data.blocks != blk_rq_sectors(req)) {
1112 int i, data_size = brq->data.blocks << 9;
1113 struct scatterlist *sg;
1115 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1116 data_size -= sg->length;
1117 if (data_size <= 0) {
1118 sg->length += data_size;
1119 i++;
1120 break;
1123 brq->data.sg_len = i;
1126 mqrq->mmc_active.mrq = &brq->mrq;
1127 mqrq->mmc_active.err_check = mmc_blk_err_check;
1129 mmc_queue_bounce_pre(mqrq);
1132 static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
1133 struct mmc_blk_request *brq, struct request *req,
1134 int ret)
1137 * If this is an SD card and we're writing, we can first
1138 * mark the known good sectors as ok.
1140 * If the card is not SD, we can still ok written sectors
1141 * as reported by the controller (which might be less than
1142 * the real number of written sectors, but never more).
1144 if (mmc_card_sd(card)) {
1145 u32 blocks;
1147 blocks = mmc_sd_num_wr_blocks(card);
1148 if (blocks != (u32)-1) {
1149 spin_lock_irq(&md->lock);
1150 ret = __blk_end_request(req, 0, blocks << 9);
1151 spin_unlock_irq(&md->lock);
1153 } else {
1154 spin_lock_irq(&md->lock);
1155 ret = __blk_end_request(req, 0, brq->data.bytes_xfered);
1156 spin_unlock_irq(&md->lock);
1158 return ret;
1161 static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
1163 struct mmc_blk_data *md = mq->data;
1164 struct mmc_card *card = md->queue.card;
1165 struct mmc_blk_request *brq = &mq->mqrq_cur->brq;
1166 int ret = 1, disable_multi = 0, retry = 0, type;
1167 enum mmc_blk_status status;
1168 struct mmc_queue_req *mq_rq;
1169 struct request *req;
1170 struct mmc_async_req *areq;
1172 if (!rqc && !mq->mqrq_prev->req)
1173 return 0;
1175 do {
1176 if (rqc) {
1177 mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1178 areq = &mq->mqrq_cur->mmc_active;
1179 } else
1180 areq = NULL;
1181 areq = mmc_start_req(card->host, areq, (int *) &status);
1182 if (!areq)
1183 return 0;
1185 mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
1186 brq = &mq_rq->brq;
1187 req = mq_rq->req;
1188 type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1189 mmc_queue_bounce_post(mq_rq);
1191 switch (status) {
1192 case MMC_BLK_SUCCESS:
1193 case MMC_BLK_PARTIAL:
1195 * A block was successfully transferred.
1197 mmc_blk_reset_success(md, type);
1198 spin_lock_irq(&md->lock);
1199 ret = __blk_end_request(req, 0,
1200 brq->data.bytes_xfered);
1201 spin_unlock_irq(&md->lock);
1203 * If the blk_end_request function returns non-zero even
1204 * though all data has been transferred and no errors
1205 * were returned by the host controller, it's a bug.
1207 if (status == MMC_BLK_SUCCESS && ret) {
1208 pr_err("%s BUG rq_tot %d d_xfer %d\n",
1209 __func__, blk_rq_bytes(req),
1210 brq->data.bytes_xfered);
1211 rqc = NULL;
1212 goto cmd_abort;
1214 break;
1215 case MMC_BLK_CMD_ERR:
1216 ret = mmc_blk_cmd_err(md, card, brq, req, ret);
1217 if (!mmc_blk_reset(md, card->host, type))
1218 break;
1219 goto cmd_abort;
1220 case MMC_BLK_RETRY:
1221 if (retry++ < 5)
1222 break;
1223 /* Fall through */
1224 case MMC_BLK_ABORT:
1225 if (!mmc_blk_reset(md, card->host, type))
1226 break;
1227 goto cmd_abort;
1228 case MMC_BLK_DATA_ERR: {
1229 int err;
1231 err = mmc_blk_reset(md, card->host, type);
1232 if (!err)
1233 break;
1234 if (err == -ENODEV)
1235 goto cmd_abort;
1236 /* Fall through */
1238 case MMC_BLK_ECC_ERR:
1239 if (brq->data.blocks > 1) {
1240 /* Redo read one sector at a time */
1241 pr_warning("%s: retrying using single block read\n",
1242 req->rq_disk->disk_name);
1243 disable_multi = 1;
1244 break;
1247 * After an error, we redo I/O one sector at a
1248 * time, so we only reach here after trying to
1249 * read a single sector.
1251 spin_lock_irq(&md->lock);
1252 ret = __blk_end_request(req, -EIO,
1253 brq->data.blksz);
1254 spin_unlock_irq(&md->lock);
1255 if (!ret)
1256 goto start_new_req;
1257 break;
1260 if (ret) {
1262 * In case of a incomplete request
1263 * prepare it again and resend.
1265 mmc_blk_rw_rq_prep(mq_rq, card, disable_multi, mq);
1266 mmc_start_req(card->host, &mq_rq->mmc_active, NULL);
1268 } while (ret);
1270 return 1;
1272 cmd_abort:
1273 spin_lock_irq(&md->lock);
1274 while (ret)
1275 ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req));
1276 spin_unlock_irq(&md->lock);
1278 start_new_req:
1279 if (rqc) {
1280 mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1281 mmc_start_req(card->host, &mq->mqrq_cur->mmc_active, NULL);
1284 return 0;
1287 static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
1289 int ret;
1290 struct mmc_blk_data *md = mq->data;
1291 struct mmc_card *card = md->queue.card;
1293 if (req && !mq->mqrq_prev->req)
1294 /* claim host only for the first request */
1295 mmc_claim_host(card->host);
1297 ret = mmc_blk_part_switch(card, md);
1298 if (ret) {
1299 if (req) {
1300 spin_lock_irq(&md->lock);
1301 __blk_end_request_all(req, -EIO);
1302 spin_unlock_irq(&md->lock);
1304 ret = 0;
1305 goto out;
1308 if (req && req->cmd_flags & REQ_DISCARD) {
1309 /* complete ongoing async transfer before issuing discard */
1310 if (card->host->areq)
1311 mmc_blk_issue_rw_rq(mq, NULL);
1312 if (req->cmd_flags & REQ_SECURE)
1313 ret = mmc_blk_issue_secdiscard_rq(mq, req);
1314 else
1315 ret = mmc_blk_issue_discard_rq(mq, req);
1316 } else if (req && req->cmd_flags & REQ_FLUSH) {
1317 /* complete ongoing async transfer before issuing flush */
1318 if (card->host->areq)
1319 mmc_blk_issue_rw_rq(mq, NULL);
1320 ret = mmc_blk_issue_flush(mq, req);
1321 } else {
1322 ret = mmc_blk_issue_rw_rq(mq, req);
1325 out:
1326 if (!req)
1327 /* release host only when there are no more requests */
1328 mmc_release_host(card->host);
1329 return ret;
1332 static inline int mmc_blk_readonly(struct mmc_card *card)
1334 return mmc_card_readonly(card) ||
1335 !(card->csd.cmdclass & CCC_BLOCK_WRITE);
1338 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
1339 struct device *parent,
1340 sector_t size,
1341 bool default_ro,
1342 const char *subname)
1344 struct mmc_blk_data *md;
1345 int devidx, ret;
1347 devidx = find_first_zero_bit(dev_use, max_devices);
1348 if (devidx >= max_devices)
1349 return ERR_PTR(-ENOSPC);
1350 __set_bit(devidx, dev_use);
1352 md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
1353 if (!md) {
1354 ret = -ENOMEM;
1355 goto out;
1359 * !subname implies we are creating main mmc_blk_data that will be
1360 * associated with mmc_card with mmc_set_drvdata. Due to device
1361 * partitions, devidx will not coincide with a per-physical card
1362 * index anymore so we keep track of a name index.
1364 if (!subname) {
1365 md->name_idx = find_first_zero_bit(name_use, max_devices);
1366 __set_bit(md->name_idx, name_use);
1368 else
1369 md->name_idx = ((struct mmc_blk_data *)
1370 dev_to_disk(parent)->private_data)->name_idx;
1373 * Set the read-only status based on the supported commands
1374 * and the write protect switch.
1376 md->read_only = mmc_blk_readonly(card);
1378 md->disk = alloc_disk(perdev_minors);
1379 if (md->disk == NULL) {
1380 ret = -ENOMEM;
1381 goto err_kfree;
1384 spin_lock_init(&md->lock);
1385 INIT_LIST_HEAD(&md->part);
1386 md->usage = 1;
1388 ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
1389 if (ret)
1390 goto err_putdisk;
1392 md->queue.issue_fn = mmc_blk_issue_rq;
1393 md->queue.data = md;
1395 md->disk->major = MMC_BLOCK_MAJOR;
1396 md->disk->first_minor = devidx * perdev_minors;
1397 md->disk->fops = &mmc_bdops;
1398 md->disk->private_data = md;
1399 md->disk->queue = md->queue.queue;
1400 md->disk->driverfs_dev = parent;
1401 set_disk_ro(md->disk, md->read_only || default_ro);
1404 * As discussed on lkml, GENHD_FL_REMOVABLE should:
1406 * - be set for removable media with permanent block devices
1407 * - be unset for removable block devices with permanent media
1409 * Since MMC block devices clearly fall under the second
1410 * case, we do not set GENHD_FL_REMOVABLE. Userspace
1411 * should use the block device creation/destruction hotplug
1412 * messages to tell when the card is present.
1415 snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
1416 "mmcblk%d%s", md->name_idx, subname ? subname : "");
1418 blk_queue_logical_block_size(md->queue.queue, 512);
1419 set_capacity(md->disk, size);
1421 if (mmc_host_cmd23(card->host)) {
1422 if (mmc_card_mmc(card) ||
1423 (mmc_card_sd(card) &&
1424 card->scr.cmds & SD_SCR_CMD23_SUPPORT))
1425 md->flags |= MMC_BLK_CMD23;
1428 if (mmc_card_mmc(card) &&
1429 md->flags & MMC_BLK_CMD23 &&
1430 ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
1431 card->ext_csd.rel_sectors)) {
1432 md->flags |= MMC_BLK_REL_WR;
1433 blk_queue_flush(md->queue.queue, REQ_FLUSH | REQ_FUA);
1436 return md;
1438 err_putdisk:
1439 put_disk(md->disk);
1440 err_kfree:
1441 kfree(md);
1442 out:
1443 return ERR_PTR(ret);
1446 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
1448 sector_t size;
1449 struct mmc_blk_data *md;
1451 if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
1453 * The EXT_CSD sector count is in number or 512 byte
1454 * sectors.
1456 size = card->ext_csd.sectors;
1457 } else {
1459 * The CSD capacity field is in units of read_blkbits.
1460 * set_capacity takes units of 512 bytes.
1462 size = card->csd.capacity << (card->csd.read_blkbits - 9);
1465 md = mmc_blk_alloc_req(card, &card->dev, size, false, NULL);
1466 return md;
1469 static int mmc_blk_alloc_part(struct mmc_card *card,
1470 struct mmc_blk_data *md,
1471 unsigned int part_type,
1472 sector_t size,
1473 bool default_ro,
1474 const char *subname)
1476 char cap_str[10];
1477 struct mmc_blk_data *part_md;
1479 part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
1480 subname);
1481 if (IS_ERR(part_md))
1482 return PTR_ERR(part_md);
1483 part_md->part_type = part_type;
1484 list_add(&part_md->part, &md->part);
1486 string_get_size((u64)get_capacity(part_md->disk) << 9, STRING_UNITS_2,
1487 cap_str, sizeof(cap_str));
1488 pr_info("%s: %s %s partition %u %s\n",
1489 part_md->disk->disk_name, mmc_card_id(card),
1490 mmc_card_name(card), part_md->part_type, cap_str);
1491 return 0;
1494 /* MMC Physical partitions consist of two boot partitions and
1495 * up to four general purpose partitions.
1496 * For each partition enabled in EXT_CSD a block device will be allocatedi
1497 * to provide access to the partition.
1500 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
1502 int idx, ret = 0;
1504 if (!mmc_card_mmc(card))
1505 return 0;
1507 for (idx = 0; idx < card->nr_parts; idx++) {
1508 if (card->part[idx].size) {
1509 ret = mmc_blk_alloc_part(card, md,
1510 card->part[idx].part_cfg,
1511 card->part[idx].size >> 9,
1512 card->part[idx].force_ro,
1513 card->part[idx].name);
1514 if (ret)
1515 return ret;
1519 return ret;
1522 static int
1523 mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card)
1525 int err;
1527 mmc_claim_host(card->host);
1528 err = mmc_set_blocklen(card, 512);
1529 mmc_release_host(card->host);
1531 if (err) {
1532 pr_err("%s: unable to set block size to 512: %d\n",
1533 md->disk->disk_name, err);
1534 return -EINVAL;
1537 return 0;
1540 static void mmc_blk_remove_req(struct mmc_blk_data *md)
1542 if (md) {
1543 if (md->disk->flags & GENHD_FL_UP) {
1544 device_remove_file(disk_to_dev(md->disk), &md->force_ro);
1546 /* Stop new requests from getting into the queue */
1547 del_gendisk(md->disk);
1550 /* Then flush out any already in there */
1551 mmc_cleanup_queue(&md->queue);
1552 mmc_blk_put(md);
1556 static void mmc_blk_remove_parts(struct mmc_card *card,
1557 struct mmc_blk_data *md)
1559 struct list_head *pos, *q;
1560 struct mmc_blk_data *part_md;
1562 __clear_bit(md->name_idx, name_use);
1563 list_for_each_safe(pos, q, &md->part) {
1564 part_md = list_entry(pos, struct mmc_blk_data, part);
1565 list_del(pos);
1566 mmc_blk_remove_req(part_md);
1570 static int mmc_add_disk(struct mmc_blk_data *md)
1572 int ret;
1574 add_disk(md->disk);
1575 md->force_ro.show = force_ro_show;
1576 md->force_ro.store = force_ro_store;
1577 sysfs_attr_init(&md->force_ro.attr);
1578 md->force_ro.attr.name = "force_ro";
1579 md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
1580 ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
1581 if (ret)
1582 del_gendisk(md->disk);
1584 return ret;
1587 static const struct mmc_fixup blk_fixups[] =
1589 MMC_FIXUP("SEM02G", 0x2, 0x100, add_quirk, MMC_QUIRK_INAND_CMD38),
1590 MMC_FIXUP("SEM04G", 0x2, 0x100, add_quirk, MMC_QUIRK_INAND_CMD38),
1591 MMC_FIXUP("SEM08G", 0x2, 0x100, add_quirk, MMC_QUIRK_INAND_CMD38),
1592 MMC_FIXUP("SEM16G", 0x2, 0x100, add_quirk, MMC_QUIRK_INAND_CMD38),
1593 MMC_FIXUP("SEM32G", 0x2, 0x100, add_quirk, MMC_QUIRK_INAND_CMD38),
1596 * Some MMC cards experience performance degradation with CMD23
1597 * instead of CMD12-bounded multiblock transfers. For now we'll
1598 * black list what's bad...
1599 * - Certain Toshiba cards.
1601 * N.B. This doesn't affect SD cards.
1603 MMC_FIXUP("MMC08G", 0x11, CID_OEMID_ANY, add_quirk_mmc,
1604 MMC_QUIRK_BLK_NO_CMD23),
1605 MMC_FIXUP("MMC16G", 0x11, CID_OEMID_ANY, add_quirk_mmc,
1606 MMC_QUIRK_BLK_NO_CMD23),
1607 MMC_FIXUP("MMC32G", 0x11, CID_OEMID_ANY, add_quirk_mmc,
1608 MMC_QUIRK_BLK_NO_CMD23),
1609 END_FIXUP
1612 static int mmc_blk_probe(struct mmc_card *card)
1614 struct mmc_blk_data *md, *part_md;
1615 int err;
1616 char cap_str[10];
1619 * Check that the card supports the command class(es) we need.
1621 if (!(card->csd.cmdclass & CCC_BLOCK_READ))
1622 return -ENODEV;
1624 md = mmc_blk_alloc(card);
1625 if (IS_ERR(md))
1626 return PTR_ERR(md);
1628 err = mmc_blk_set_blksize(md, card);
1629 if (err)
1630 goto out;
1632 string_get_size((u64)get_capacity(md->disk) << 9, STRING_UNITS_2,
1633 cap_str, sizeof(cap_str));
1634 pr_info("%s: %s %s %s %s\n",
1635 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
1636 cap_str, md->read_only ? "(ro)" : "");
1638 if (mmc_blk_alloc_parts(card, md))
1639 goto out;
1641 mmc_set_drvdata(card, md);
1642 mmc_fixup_device(card, blk_fixups);
1644 if (mmc_add_disk(md))
1645 goto out;
1647 list_for_each_entry(part_md, &md->part, part) {
1648 if (mmc_add_disk(part_md))
1649 goto out;
1651 return 0;
1653 out:
1654 mmc_blk_remove_parts(card, md);
1655 mmc_blk_remove_req(md);
1656 return err;
1659 static void mmc_blk_remove(struct mmc_card *card)
1661 struct mmc_blk_data *md = mmc_get_drvdata(card);
1663 mmc_blk_remove_parts(card, md);
1664 mmc_claim_host(card->host);
1665 mmc_blk_part_switch(card, md);
1666 mmc_release_host(card->host);
1667 mmc_blk_remove_req(md);
1668 mmc_set_drvdata(card, NULL);
1671 #ifdef CONFIG_PM
1672 static int mmc_blk_suspend(struct mmc_card *card, pm_message_t state)
1674 struct mmc_blk_data *part_md;
1675 struct mmc_blk_data *md = mmc_get_drvdata(card);
1677 if (md) {
1678 mmc_queue_suspend(&md->queue);
1679 list_for_each_entry(part_md, &md->part, part) {
1680 mmc_queue_suspend(&part_md->queue);
1683 return 0;
1686 static int mmc_blk_resume(struct mmc_card *card)
1688 struct mmc_blk_data *part_md;
1689 struct mmc_blk_data *md = mmc_get_drvdata(card);
1691 if (md) {
1692 mmc_blk_set_blksize(md, card);
1695 * Resume involves the card going into idle state,
1696 * so current partition is always the main one.
1698 md->part_curr = md->part_type;
1699 mmc_queue_resume(&md->queue);
1700 list_for_each_entry(part_md, &md->part, part) {
1701 mmc_queue_resume(&part_md->queue);
1704 return 0;
1706 #else
1707 #define mmc_blk_suspend NULL
1708 #define mmc_blk_resume NULL
1709 #endif
1711 static struct mmc_driver mmc_driver = {
1712 .drv = {
1713 .name = "mmcblk",
1715 .probe = mmc_blk_probe,
1716 .remove = mmc_blk_remove,
1717 .suspend = mmc_blk_suspend,
1718 .resume = mmc_blk_resume,
1721 static int __init mmc_blk_init(void)
1723 int res;
1725 if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
1726 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
1728 max_devices = 256 / perdev_minors;
1730 res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
1731 if (res)
1732 goto out;
1734 res = mmc_register_driver(&mmc_driver);
1735 if (res)
1736 goto out2;
1738 return 0;
1739 out2:
1740 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
1741 out:
1742 return res;
1745 static void __exit mmc_blk_exit(void)
1747 mmc_unregister_driver(&mmc_driver);
1748 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
1751 module_init(mmc_blk_init);
1752 module_exit(mmc_blk_exit);
1754 MODULE_LICENSE("GPL");
1755 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");