projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
? search:
summary | shortlog | log | commit | commitdiff | tree
blob | blame (incremental) | history | HEAD
mmc: initialize struct mmc_command at declaration time
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / mmc / card / block.c
CommitLineData
1da177e4
LT		 1/*
2 * Block driver for media (i.e., flash cards)
3 *
4 * Copyright 2002 Hewlett-Packard Company
979ce720 5 * Copyright 2005-2008 Pierre Ossman
1da177e4
LT		 6 *
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.
10 *
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.
14 *
15 * Many thanks to Alessandro Rubini and Jonathan Corbet!
16 *
17 * Author: Andrew Christian
18 * 28 May 2002
19 */
20#include <linux/moduleparam.h>
21#include <linux/module.h>
22#include <linux/init.h>
23
1da177e4
LT		 24#include <linux/kernel.h>
25#include <linux/fs.h>
5a0e3ad6 26#include <linux/slab.h>
1da177e4
LT		 27#include <linux/errno.h>
28#include <linux/hdreg.h>
29#include <linux/kdev_t.h>
30#include <linux/blkdev.h>
a621aaed 31#include <linux/mutex.h>
ec5a19dd 32#include <linux/scatterlist.h>
a7bbb573 33#include <linux/string_helpers.h>
1da177e4
LT		 34
35#include <linux/mmc/card.h>
385e3227 36#include <linux/mmc/host.h>
da7fbe58
PO		 37#include <linux/mmc/mmc.h>
38#include <linux/mmc/sd.h>
1da177e4
LT		 39
40#include <asm/system.h>
41#include <asm/uaccess.h>
42
98ac2162 43#include "queue.h"
1da177e4 44
6b0b6285 45MODULE_ALIAS("mmc:block");
5e71b7a6
OJ		 46#ifdef MODULE_PARAM_PREFIX
47#undef MODULE_PARAM_PREFIX
48#endif
49#define MODULE_PARAM_PREFIX "mmcblk."
50
6a7a6b45
AW		 51#define INAND_CMD38_ARG_EXT_CSD 113
52#define INAND_CMD38_ARG_ERASE 0x00
53#define INAND_CMD38_ARG_TRIM 0x01
54#define INAND_CMD38_ARG_SECERASE 0x80
55#define INAND_CMD38_ARG_SECTRIM1 0x81
56#define INAND_CMD38_ARG_SECTRIM2 0x88
57
f4c5522b
AW		 58#define REL_WRITES_SUPPORTED(card) (mmc_card_mmc((card)) && \
59 (((card)->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) || \
60 ((card)->ext_csd.rel_sectors)))
61
5e71b7a6 62static DEFINE_MUTEX(block_mutex);
6b0b6285 63
1da177e4 64/*
5e71b7a6
OJ		 65 * The defaults come from config options but can be overriden by module
66 * or bootarg options.
1da177e4 67 */
5e71b7a6 68static int perdev_minors = CONFIG_MMC_BLOCK_MINORS;
1dff3144 69
5e71b7a6
OJ		 70/*
71 * We've only got one major, so number of mmcblk devices is
72 * limited to 256 / number of minors per device.
73 */
74static int max_devices;
75
76/* 256 minors, so at most 256 separate devices */
77static DECLARE_BITMAP(dev_use, 256);
1da177e4 78
1da177e4
LT		 79/*
80 * There is one mmc_blk_data per slot.
81 */
82struct mmc_blk_data {
83 spinlock_t lock;
84 struct gendisk *disk;
85 struct mmc_queue queue;
371a689f 86 struct list_head part;
1da177e4
LT		 87
88 unsigned int usage;
a6f6c96b 89 unsigned int read_only;
371a689f
AW		 90 unsigned int part_type;
91
92 /*
93 * Only set in main mmc_blk_data associated
94 * with mmc_card with mmc_set_drvdata, and keeps
95 * track of the current selected device partition.
96 */
97 unsigned int part_curr;
98 struct device_attribute force_ro;
1da177e4
LT		 99};
100
a621aaed 101static DEFINE_MUTEX(open_lock);
1da177e4 102
5e71b7a6
OJ		 103module_param(perdev_minors, int, 0444);
104MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
105
1da177e4
LT		 106static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
107{
108 struct mmc_blk_data *md;
109
a621aaed 110 mutex_lock(&open_lock);
1da177e4
LT		 111 md = disk->private_data;
112 if (md && md->usage == 0)
113 md = NULL;
114 if (md)
115 md->usage++;
a621aaed 116 mutex_unlock(&open_lock);
1da177e4
LT		 117
118 return md;
119}
120
371a689f
AW		 121static inline int mmc_get_devidx(struct gendisk *disk)
122{
123 int devmaj = MAJOR(disk_devt(disk));
124 int devidx = MINOR(disk_devt(disk)) / perdev_minors;
125
126 if (!devmaj)
127 devidx = disk->first_minor / perdev_minors;
128 return devidx;
129}
130
1da177e4
LT		 131static void mmc_blk_put(struct mmc_blk_data *md)
132{
a621aaed 133 mutex_lock(&open_lock);
1da177e4
LT		 134 md->usage--;
135 if (md->usage == 0) {
371a689f 136 int devidx = mmc_get_devidx(md->disk);
5fa83ce2
AH		 137 blk_cleanup_queue(md->queue.queue);
138
1dff3144
DW		 139 __clear_bit(devidx, dev_use);
140
1da177e4 141 put_disk(md->disk);
1da177e4
LT		 142 kfree(md);
143 }
a621aaed 144 mutex_unlock(&open_lock);
1da177e4
LT		 145}
146
371a689f
AW		 147static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
148 char *buf)
149{
150 int ret;
151 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
152
153 ret = snprintf(buf, PAGE_SIZE, "%d",
154 get_disk_ro(dev_to_disk(dev)) ^
155 md->read_only);
156 mmc_blk_put(md);
157 return ret;
158}
159
160static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
161 const char *buf, size_t count)
162{
163 int ret;
164 char *end;
165 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
166 unsigned long set = simple_strtoul(buf, &end, 0);
167 if (end == buf) {
168 ret = -EINVAL;
169 goto out;
170 }
171
172 set_disk_ro(dev_to_disk(dev), set || md->read_only);
173 ret = count;
174out:
175 mmc_blk_put(md);
176 return ret;
177}
178
a5a1561f 179static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
1da177e4 180{
a5a1561f 181 struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
1da177e4
LT		 182 int ret = -ENXIO;
183
2a48fc0a 184 mutex_lock(&block_mutex);
1da177e4
LT		 185 if (md) {
186 if (md->usage == 2)
a5a1561f 187 check_disk_change(bdev);
1da177e4 188 ret = 0;
a00fc090 189
a5a1561f 190 if ((mode & FMODE_WRITE) && md->read_only) {
70bb0896 191 mmc_blk_put(md);
a00fc090 192 ret = -EROFS;
70bb0896 193 }
1da177e4 194 }
2a48fc0a 195 mutex_unlock(&block_mutex);
1da177e4
LT		 196
197 return ret;
198}
199
a5a1561f 200static int mmc_blk_release(struct gendisk *disk, fmode_t mode)
1da177e4 201{
a5a1561f 202 struct mmc_blk_data *md = disk->private_data;
1da177e4 203
2a48fc0a 204 mutex_lock(&block_mutex);
1da177e4 205 mmc_blk_put(md);
2a48fc0a 206 mutex_unlock(&block_mutex);
1da177e4
LT		 207 return 0;
208}
209
210static int
a885c8c4 211mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1da177e4 212{
a885c8c4
CH		 213 geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
214 geo->heads = 4;
215 geo->sectors = 16;
216 return 0;
1da177e4
LT		 217}
218
83d5cde4 219static const struct block_device_operations mmc_bdops = {
a5a1561f
AV		 220 .open = mmc_blk_open,
221 .release = mmc_blk_release,
a885c8c4 222 .getgeo = mmc_blk_getgeo,
1da177e4
LT		 223 .owner = THIS_MODULE,
224};
225
226struct mmc_blk_request {
227 struct mmc_request mrq;
228 struct mmc_command cmd;
229 struct mmc_command stop;
230 struct mmc_data data;
231};
232
371a689f
AW		 233static inline int mmc_blk_part_switch(struct mmc_card *card,
234 struct mmc_blk_data *md)
235{
236 int ret;
237 struct mmc_blk_data *main_md = mmc_get_drvdata(card);
238 if (main_md->part_curr == md->part_type)
239 return 0;
240
241 if (mmc_card_mmc(card)) {
242 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
243 card->ext_csd.part_config |= md->part_type;
244
245 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
246 EXT_CSD_PART_CONFIG, card->ext_csd.part_config,
247 card->ext_csd.part_time);
248 if (ret)
249 return ret;
250}
251
252 main_md->part_curr = md->part_type;
253 return 0;
254}
255
ec5a19dd
PO		 256static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
257{
258 int err;
051913da
BD		 259 u32 result;
260 __be32 *blocks;
ec5a19dd
PO		 261
262 struct mmc_request mrq;
1278dba1 263 struct mmc_command cmd = {0};
ec5a19dd
PO		 264 struct mmc_data data;
265 unsigned int timeout_us;
266
267 struct scatterlist sg;
268
ec5a19dd
PO		 269 cmd.opcode = MMC_APP_CMD;
270 cmd.arg = card->rca << 16;
7213d175 271 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
ec5a19dd
PO		 272
273 err = mmc_wait_for_cmd(card->host, &cmd, 0);
7213d175
DB		 274 if (err)
275 return (u32)-1;
276 if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
ec5a19dd
PO		 277 return (u32)-1;
278
279 memset(&cmd, 0, sizeof(struct mmc_command));
280
281 cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
282 cmd.arg = 0;
7213d175 283 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
ec5a19dd
PO		 284
285 memset(&data, 0, sizeof(struct mmc_data));
286
287 data.timeout_ns = card->csd.tacc_ns * 100;
288 data.timeout_clks = card->csd.tacc_clks * 100;
289
290 timeout_us = data.timeout_ns / 1000;
291 timeout_us += data.timeout_clks * 1000 /
292 (card->host->ios.clock / 1000);
293
294 if (timeout_us > 100000) {
295 data.timeout_ns = 100000000;
296 data.timeout_clks = 0;
297 }
298
299 data.blksz = 4;
300 data.blocks = 1;
301 data.flags = MMC_DATA_READ;
302 data.sg = &sg;
303 data.sg_len = 1;
304
305 memset(&mrq, 0, sizeof(struct mmc_request));
306
307 mrq.cmd = &cmd;
308 mrq.data = &data;
309
051913da
BD		 310 blocks = kmalloc(4, GFP_KERNEL);
311 if (!blocks)
312 return (u32)-1;
313
314 sg_init_one(&sg, blocks, 4);
ec5a19dd
PO		 315
316 mmc_wait_for_req(card->host, &mrq);
317
051913da
BD		 318 result = ntohl(*blocks);
319 kfree(blocks);
320
17b0429d 321 if (cmd.error || data.error)
051913da 322 result = (u32)-1;
ec5a19dd 323
051913da 324 return result;
ec5a19dd
PO		 325}
326
504f191f
AH		 327static u32 get_card_status(struct mmc_card *card, struct request *req)
328{
1278dba1 329 struct mmc_command cmd = {0};
504f191f
AH		 330 int err;
331
504f191f
AH		 332 cmd.opcode = MMC_SEND_STATUS;
333 if (!mmc_host_is_spi(card->host))
334 cmd.arg = card->rca << 16;
335 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
336 err = mmc_wait_for_cmd(card->host, &cmd, 0);
337 if (err)
b595076a 338 printk(KERN_ERR "%s: error %d sending status command",
504f191f
AH		 339 req->rq_disk->disk_name, err);
340 return cmd.resp[0];
341}
342
bd788c96
AH		 343static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
344{
345 struct mmc_blk_data *md = mq->data;
346 struct mmc_card *card = md->queue.card;
347 unsigned int from, nr, arg;
348 int err = 0;
349
bd788c96
AH		 350 if (!mmc_can_erase(card)) {
351 err = -EOPNOTSUPP;
352 goto out;
353 }
354
355 from = blk_rq_pos(req);
356 nr = blk_rq_sectors(req);
357
358 if (mmc_can_trim(card))
359 arg = MMC_TRIM_ARG;
360 else
361 arg = MMC_ERASE_ARG;
362
6a7a6b45
AW		 363 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
364 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
365 INAND_CMD38_ARG_EXT_CSD,
366 arg == MMC_TRIM_ARG ?
367 INAND_CMD38_ARG_TRIM :
368 INAND_CMD38_ARG_ERASE,
369 0);
370 if (err)
371 goto out;
372 }
bd788c96
AH		 373 err = mmc_erase(card, from, nr, arg);
374out:
375 spin_lock_irq(&md->lock);
376 __blk_end_request(req, err, blk_rq_bytes(req));
377 spin_unlock_irq(&md->lock);
378
bd788c96
AH		 379 return err ? 0 : 1;
380}
381
49804548
AH		 382static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
383 struct request *req)
384{
385 struct mmc_blk_data *md = mq->data;
386 struct mmc_card *card = md->queue.card;
387 unsigned int from, nr, arg;
388 int err = 0;
389
49804548
AH		 390 if (!mmc_can_secure_erase_trim(card)) {
391 err = -EOPNOTSUPP;
392 goto out;
393 }
394
395 from = blk_rq_pos(req);
396 nr = blk_rq_sectors(req);
397
398 if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
399 arg = MMC_SECURE_TRIM1_ARG;
400 else
401 arg = MMC_SECURE_ERASE_ARG;
402
6a7a6b45
AW		 403 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
404 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
405 INAND_CMD38_ARG_EXT_CSD,
406 arg == MMC_SECURE_TRIM1_ARG ?
407 INAND_CMD38_ARG_SECTRIM1 :
408 INAND_CMD38_ARG_SECERASE,
409 0);
410 if (err)
411 goto out;
412 }
49804548 413 err = mmc_erase(card, from, nr, arg);
6a7a6b45
AW		 414 if (!err && arg == MMC_SECURE_TRIM1_ARG) {
415 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
416 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
417 INAND_CMD38_ARG_EXT_CSD,
418 INAND_CMD38_ARG_SECTRIM2,
419 0);
420 if (err)
421 goto out;
422 }
49804548 423 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
6a7a6b45 424 }
49804548
AH		 425out:
426 spin_lock_irq(&md->lock);
427 __blk_end_request(req, err, blk_rq_bytes(req));
428 spin_unlock_irq(&md->lock);
429
49804548
AH		 430 return err ? 0 : 1;
431}
432
f4c5522b
AW		 433static int mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
434{
435 struct mmc_blk_data *md = mq->data;
436
437 /*
438 * No-op, only service this because we need REQ_FUA for reliable
439 * writes.
440 */
441 spin_lock_irq(&md->lock);
442 __blk_end_request_all(req, 0);
443 spin_unlock_irq(&md->lock);
444
445 return 1;
446}
447
448/*
449 * Reformat current write as a reliable write, supporting
450 * both legacy and the enhanced reliable write MMC cards.
451 * In each transfer we'll handle only as much as a single
452 * reliable write can handle, thus finish the request in
453 * partial completions.
454 */
455static inline int mmc_apply_rel_rw(struct mmc_blk_request *brq,
456 struct mmc_card *card,
457 struct request *req)
458{
459 int err;
1278dba1 460 struct mmc_command set_count = {0};
f4c5522b
AW		 461
462 if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
463 /* Legacy mode imposes restrictions on transfers. */
464 if (!IS_ALIGNED(brq->cmd.arg, card->ext_csd.rel_sectors))
465 brq->data.blocks = 1;
466
467 if (brq->data.blocks > card->ext_csd.rel_sectors)
468 brq->data.blocks = card->ext_csd.rel_sectors;
469 else if (brq->data.blocks < card->ext_csd.rel_sectors)
470 brq->data.blocks = 1;
471 }
472
f4c5522b
AW		 473 set_count.opcode = MMC_SET_BLOCK_COUNT;
474 set_count.arg = brq->data.blocks | (1 << 31);
475 set_count.flags = MMC_RSP_R1 | MMC_CMD_AC;
476 err = mmc_wait_for_cmd(card->host, &set_count, 0);
477 if (err)
478 printk(KERN_ERR "%s: error %d SET_BLOCK_COUNT\n",
479 req->rq_disk->disk_name, err);
480 return err;
481}
482
bd788c96 483static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *req)
1da177e4
LT		 484{
485 struct mmc_blk_data *md = mq->data;
486 struct mmc_card *card = md->queue.card;
176f00ff 487 struct mmc_blk_request brq;
6a79e391 488 int ret = 1, disable_multi = 0;
1da177e4 489
f4c5522b
AW		 490 /*
491 * Reliable writes are used to implement Forced Unit Access and
492 * REQ_META accesses, and are supported only on MMCs.
493 */
494 bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
495 (req->cmd_flags & REQ_META)) &&
496 (rq_data_dir(req) == WRITE) &&
497 REL_WRITES_SUPPORTED(card);
498
1da177e4 499 do {
1278dba1 500 struct mmc_command cmd = {0};
504f191f 501 u32 readcmd, writecmd, status = 0;
1da177e4
LT		 502
503 memset(&brq, 0, sizeof(struct mmc_blk_request));
504 brq.mrq.cmd = &brq.cmd;
505 brq.mrq.data = &brq.data;
506
83096ebf 507 brq.cmd.arg = blk_rq_pos(req);
fba68bd2
PL		 508 if (!mmc_card_blockaddr(card))
509 brq.cmd.arg <<= 9;
7213d175 510 brq.cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
08846698 511 brq.data.blksz = 512;
1da177e4
LT		 512 brq.stop.opcode = MMC_STOP_TRANSMISSION;
513 brq.stop.arg = 0;
7213d175 514 brq.stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
83096ebf 515 brq.data.blocks = blk_rq_sectors(req);
1da177e4 516
548d2de9
PO		 517 /*
518 * The block layer doesn't support all sector count
519 * restrictions, so we need to be prepared for too big
520 * requests.
521 */
522 if (brq.data.blocks > card->host->max_blk_count)
523 brq.data.blocks = card->host->max_blk_count;
524
6a79e391
AH		 525 /*
526 * After a read error, we redo the request one sector at a time
527 * in order to accurately determine which sectors can be read
528 * successfully.
529 */
530 if (disable_multi && brq.data.blocks > 1)
531 brq.data.blocks = 1;
532
f4c5522b 533 if (brq.data.blocks > 1 || do_rel_wr) {
7213d175 534 /* SPI multiblock writes terminate using a special
f4c5522b
AW		 535 * token, not a STOP_TRANSMISSION request. Reliable
536 * writes use SET_BLOCK_COUNT and do not use a
537 * STOP_TRANSMISSION request either.
7213d175 538 */
f4c5522b
AW		 539 if ((!mmc_host_is_spi(card->host) && !do_rel_wr) ||
540 rq_data_dir(req) == READ)
7213d175 541 brq.mrq.stop = &brq.stop;
db53f28b
RK		 542 readcmd = MMC_READ_MULTIPLE_BLOCK;
543 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
788ee7b0
RK		 544 } else {
545 brq.mrq.stop = NULL;
db53f28b
RK		 546 readcmd = MMC_READ_SINGLE_BLOCK;
547 writecmd = MMC_WRITE_BLOCK;
548 }
db53f28b
RK		 549 if (rq_data_dir(req) == READ) {
550 brq.cmd.opcode = readcmd;
551 brq.data.flags |= MMC_DATA_READ;
552 } else {
553 brq.cmd.opcode = writecmd;
554 brq.data.flags |= MMC_DATA_WRITE;
788ee7b0 555 }
1da177e4 556
f4c5522b
AW		 557 if (do_rel_wr && mmc_apply_rel_rw(&brq, card, req))
558 goto cmd_err;
559
b146d26a
PO		 560 mmc_set_data_timeout(&brq.data, card);
561
1da177e4 562 brq.data.sg = mq->sg;
98ccf149
PO		 563 brq.data.sg_len = mmc_queue_map_sg(mq);
564
6a79e391
AH		 565 /*
566 * Adjust the sg list so it is the same size as the
567 * request.
568 */
83096ebf 569 if (brq.data.blocks != blk_rq_sectors(req)) {
6a79e391
AH		 570 int i, data_size = brq.data.blocks << 9;
571 struct scatterlist *sg;
572
573 for_each_sg(brq.data.sg, sg, brq.data.sg_len, i) {
574 data_size -= sg->length;
575 if (data_size <= 0) {
576 sg->length += data_size;
577 i++;
578 break;
579 }
580 }
581 brq.data.sg_len = i;
582 }
583
98ccf149 584 mmc_queue_bounce_pre(mq);
1da177e4
LT		 585
586 mmc_wait_for_req(card->host, &brq.mrq);
98ccf149
PO		 587
588 mmc_queue_bounce_post(mq);
589
979ce720
PO		 590 /*
591 * Check for errors here, but don't jump to cmd_err
592 * until later as we need to wait for the card to leave
593 * programming mode even when things go wrong.
594 */
6a79e391
AH		 595 if (brq.cmd.error || brq.data.error || brq.stop.error) {
596 if (brq.data.blocks > 1 && rq_data_dir(req) == READ) {
597 /* Redo read one sector at a time */
598 printk(KERN_WARNING "%s: retrying using single "
599 "block read\n", req->rq_disk->disk_name);
600 disable_multi = 1;
601 continue;
602 }
504f191f 603 status = get_card_status(card, req);
6a79e391 604 }
504f191f 605
1da177e4 606 if (brq.cmd.error) {
504f191f
AH		 607 printk(KERN_ERR "%s: error %d sending read/write "
608 "command, response %#x, card status %#x\n",
609 req->rq_disk->disk_name, brq.cmd.error,
610 brq.cmd.resp[0], status);
1da177e4
LT		 611 }
612
613 if (brq.data.error) {
504f191f
AH		 614 if (brq.data.error == -ETIMEDOUT && brq.mrq.stop)
615 /* 'Stop' response contains card status */
616 status = brq.mrq.stop->resp[0];
617 printk(KERN_ERR "%s: error %d transferring data,"
618 " sector %u, nr %u, card status %#x\n",
619 req->rq_disk->disk_name, brq.data.error,
83096ebf
TH		 620 (unsigned)blk_rq_pos(req),
621 (unsigned)blk_rq_sectors(req), status);
1da177e4
LT		 622 }
623
624 if (brq.stop.error) {
504f191f
AH		 625 printk(KERN_ERR "%s: error %d sending stop command, "
626 "response %#x, card status %#x\n",
627 req->rq_disk->disk_name, brq.stop.error,
628 brq.stop.resp[0], status);
1da177e4
LT		 629 }
630
7213d175 631 if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
2ed6d22c
RK		 632 do {
633 int err;
634
635 cmd.opcode = MMC_SEND_STATUS;
636 cmd.arg = card->rca << 16;
637 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
638 err = mmc_wait_for_cmd(card->host, &cmd, 5);
639 if (err) {
640 printk(KERN_ERR "%s: error %d requesting status\n",
641 req->rq_disk->disk_name, err);
642 goto cmd_err;
643 }
d198f101
PO		 644 /*
645 * Some cards mishandle the status bits,
646 * so make sure to check both the busy
647 * indication and the card state.
648 */
649 } while (!(cmd.resp[0] & R1_READY_FOR_DATA) ||
650 (R1_CURRENT_STATE(cmd.resp[0]) == 7));
1da177e4
LT		 651
652#if 0
2ed6d22c
RK		 653 if (cmd.resp[0] & ~0x00000900)
654 printk(KERN_ERR "%s: status = %08x\n",
655 req->rq_disk->disk_name, cmd.resp[0]);
656 if (mmc_decode_status(cmd.resp))
657 goto cmd_err;
1da177e4 658#endif
2ed6d22c 659 }
1da177e4 660
6a79e391
AH		 661 if (brq.cmd.error || brq.stop.error || brq.data.error) {
662 if (rq_data_dir(req) == READ) {
663 /*
664 * After an error, we redo I/O one sector at a
665 * time, so we only reach here after trying to
666 * read a single sector.
667 */
668 spin_lock_irq(&md->lock);
669 ret = __blk_end_request(req, -EIO, brq.data.blksz);
670 spin_unlock_irq(&md->lock);
671 continue;
672 }
979ce720 673 goto cmd_err;
6a79e391 674 }
979ce720 675
1da177e4
LT		 676 /*
677 * A block was successfully transferred.
678 */
679 spin_lock_irq(&md->lock);
fd539832 680 ret = __blk_end_request(req, 0, brq.data.bytes_xfered);
1da177e4
LT		 681 spin_unlock_irq(&md->lock);
682 } while (ret);
683
1da177e4
LT		 684 return 1;
685
686 cmd_err:
ec5a19dd
PO		 687 /*
688 * If this is an SD card and we're writing, we can first
689 * mark the known good sectors as ok.
690 *
691 * If the card is not SD, we can still ok written sectors
23af6039
PO		 692 * as reported by the controller (which might be less than
693 * the real number of written sectors, but never more).
1da177e4 694 */
6a79e391
AH		 695 if (mmc_card_sd(card)) {
696 u32 blocks;
23af6039 697
6a79e391
AH		 698 blocks = mmc_sd_num_wr_blocks(card);
699 if (blocks != (u32)-1) {
ec5a19dd 700 spin_lock_irq(&md->lock);
6a79e391 701 ret = __blk_end_request(req, 0, blocks << 9);
ec5a19dd
PO		 702 spin_unlock_irq(&md->lock);
703 }
6a79e391
AH		 704 } else {
705 spin_lock_irq(&md->lock);
706 ret = __blk_end_request(req, 0, brq.data.bytes_xfered);
707 spin_unlock_irq(&md->lock);
176f00ff
PO		 708 }
709
1da177e4 710 spin_lock_irq(&md->lock);
fd539832
KU		 711 while (ret)
712 ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req));
1da177e4
LT		 713 spin_unlock_irq(&md->lock);
714
715 return 0;
716}
717
bd788c96
AH		 718static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
719{
1a258db6
AW		 720 int ret;
721 struct mmc_blk_data *md = mq->data;
722 struct mmc_card *card = md->queue.card;
723
724 mmc_claim_host(card->host);
371a689f
AW		 725 ret = mmc_blk_part_switch(card, md);
726 if (ret) {
727 ret = 0;
728 goto out;
729 }
1a258db6 730
49804548
AH		 731 if (req->cmd_flags & REQ_DISCARD) {
732 if (req->cmd_flags & REQ_SECURE)
1a258db6 733 ret = mmc_blk_issue_secdiscard_rq(mq, req);
49804548 734 else
1a258db6 735 ret = mmc_blk_issue_discard_rq(mq, req);
f4c5522b 736 } else if (req->cmd_flags & REQ_FLUSH) {
1a258db6 737 ret = mmc_blk_issue_flush(mq, req);
49804548 738 } else {
1a258db6 739 ret = mmc_blk_issue_rw_rq(mq, req);
49804548 740 }
1a258db6 741
371a689f 742out:
1a258db6
AW		 743 mmc_release_host(card->host);
744 return ret;
bd788c96 745}
1da177e4 746
a6f6c96b
RK		 747static inline int mmc_blk_readonly(struct mmc_card *card)
748{
749 return mmc_card_readonly(card) ||
750 !(card->csd.cmdclass & CCC_BLOCK_WRITE);
751}
752
371a689f
AW		 753static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
754 struct device *parent,
755 sector_t size,
756 bool default_ro,
757 const char *subname)
1da177e4
LT		 758{
759 struct mmc_blk_data *md;
760 int devidx, ret;
761
5e71b7a6
OJ		 762 devidx = find_first_zero_bit(dev_use, max_devices);
763 if (devidx >= max_devices)
1da177e4
LT		 764 return ERR_PTR(-ENOSPC);
765 __set_bit(devidx, dev_use);
766
dd00cc48 767 md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
a6f6c96b
RK		 768 if (!md) {
769 ret = -ENOMEM;
770 goto out;
771 }
1da177e4 772
a6f6c96b
RK		 773 /*
774 * Set the read-only status based on the supported commands
775 * and the write protect switch.
776 */
777 md->read_only = mmc_blk_readonly(card);
1da177e4 778
5e71b7a6 779 md->disk = alloc_disk(perdev_minors);
a6f6c96b
RK		 780 if (md->disk == NULL) {
781 ret = -ENOMEM;
782 goto err_kfree;
783 }
1da177e4 784
a6f6c96b 785 spin_lock_init(&md->lock);
371a689f 786 INIT_LIST_HEAD(&md->part);
a6f6c96b 787 md->usage = 1;
1da177e4 788
a6f6c96b
RK		 789 ret = mmc_init_queue(&md->queue, card, &md->lock);
790 if (ret)
791 goto err_putdisk;
1da177e4 792
a6f6c96b
RK		 793 md->queue.issue_fn = mmc_blk_issue_rq;
794 md->queue.data = md;
d2b18394 795
fe6b4c88 796 md->disk->major = MMC_BLOCK_MAJOR;
5e71b7a6 797 md->disk->first_minor = devidx * perdev_minors;
a6f6c96b
RK		 798 md->disk->fops = &mmc_bdops;
799 md->disk->private_data = md;
800 md->disk->queue = md->queue.queue;
371a689f
AW		 801 md->disk->driverfs_dev = parent;
802 set_disk_ro(md->disk, md->read_only || default_ro);
f4c5522b
AW		 803 if (REL_WRITES_SUPPORTED(card))
804 blk_queue_flush(md->queue.queue, REQ_FLUSH | REQ_FUA);
a6f6c96b
RK		 805
806 /*
807 * As discussed on lkml, GENHD_FL_REMOVABLE should:
808 *
809 * - be set for removable media with permanent block devices
810 * - be unset for removable block devices with permanent media
811 *
812 * Since MMC block devices clearly fall under the second
813 * case, we do not set GENHD_FL_REMOVABLE. Userspace
814 * should use the block device creation/destruction hotplug
815 * messages to tell when the card is present.
816 */
817
371a689f
AW		 818 if (subname)
819 snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
820 "mmcblk%d%s",
821 mmc_get_devidx(dev_to_disk(parent)), subname);
822 else
823 snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
824 "mmcblk%d", devidx);
a6f6c96b 825
e1defc4f 826 blk_queue_logical_block_size(md->queue.queue, 512);
371a689f
AW		 827 set_capacity(md->disk, size);
828 return md;
829
830 err_putdisk:
831 put_disk(md->disk);
832 err_kfree:
833 kfree(md);
834 out:
835 return ERR_PTR(ret);
836}
837
838static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
839{
840 sector_t size;
841 struct mmc_blk_data *md;
a6f6c96b 842
85a18ad9
PO		 843 if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
844 /*
845 * The EXT_CSD sector count is in number or 512 byte
846 * sectors.
847 */
371a689f 848 size = card->ext_csd.sectors;
85a18ad9
PO		 849 } else {
850 /*
851 * The CSD capacity field is in units of read_blkbits.
852 * set_capacity takes units of 512 bytes.
853 */
371a689f 854 size = card->csd.capacity << (card->csd.read_blkbits - 9);
85a18ad9 855 }
371a689f
AW		 856
857 md = mmc_blk_alloc_req(card, &card->dev, size, false, NULL);
1da177e4 858 return md;
371a689f 859}
a6f6c96b 860
371a689f
AW		 861static int mmc_blk_alloc_part(struct mmc_card *card,
862 struct mmc_blk_data *md,
863 unsigned int part_type,
864 sector_t size,
865 bool default_ro,
866 const char *subname)
867{
868 char cap_str[10];
869 struct mmc_blk_data *part_md;
870
871 part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
872 subname);
873 if (IS_ERR(part_md))
874 return PTR_ERR(part_md);
875 part_md->part_type = part_type;
876 list_add(&part_md->part, &md->part);
877
878 string_get_size((u64)get_capacity(part_md->disk) << 9, STRING_UNITS_2,
879 cap_str, sizeof(cap_str));
880 printk(KERN_INFO "%s: %s %s partition %u %s\n",
881 part_md->disk->disk_name, mmc_card_id(card),
882 mmc_card_name(card), part_md->part_type, cap_str);
883 return 0;
884}
885
886static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
887{
888 int ret = 0;
889
890 if (!mmc_card_mmc(card))
891 return 0;
892
893 if (card->ext_csd.boot_size) {
894 ret = mmc_blk_alloc_part(card, md, EXT_CSD_PART_CONFIG_ACC_BOOT0,
895 card->ext_csd.boot_size >> 9,
896 true,
897 "boot0");
898 if (ret)
899 return ret;
900 ret = mmc_blk_alloc_part(card, md, EXT_CSD_PART_CONFIG_ACC_BOOT1,
901 card->ext_csd.boot_size >> 9,
902 true,
903 "boot1");
904 if (ret)
905 return ret;
906 }
907
908 return ret;
1da177e4
LT		 909}
910
911static int
912mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card)
913{
1da177e4
LT		 914 int err;
915
b855885e 916 mmc_claim_host(card->host);
0f8d8ea6 917 err = mmc_set_blocklen(card, 512);
b855885e 918 mmc_release_host(card->host);
1da177e4
LT		 919
920 if (err) {
0f8d8ea6
AH		 921 printk(KERN_ERR "%s: unable to set block size to 512: %d\n",
922 md->disk->disk_name, err);
1da177e4
LT		 923 return -EINVAL;
924 }
925
926 return 0;
927}
928
371a689f
AW		 929static void mmc_blk_remove_req(struct mmc_blk_data *md)
930{
931 if (md) {
932 if (md->disk->flags & GENHD_FL_UP) {
933 device_remove_file(disk_to_dev(md->disk), &md->force_ro);
934
935 /* Stop new requests from getting into the queue */
936 del_gendisk(md->disk);
937 }
938
939 /* Then flush out any already in there */
940 mmc_cleanup_queue(&md->queue);
941 mmc_blk_put(md);
942 }
943}
944
945static void mmc_blk_remove_parts(struct mmc_card *card,
946 struct mmc_blk_data *md)
947{
948 struct list_head *pos, *q;
949 struct mmc_blk_data *part_md;
950
951 list_for_each_safe(pos, q, &md->part) {
952 part_md = list_entry(pos, struct mmc_blk_data, part);
953 list_del(pos);
954 mmc_blk_remove_req(part_md);
955 }
956}
957
958static int mmc_add_disk(struct mmc_blk_data *md)
959{
960 int ret;
961
962 add_disk(md->disk);
963 md->force_ro.show = force_ro_show;
964 md->force_ro.store = force_ro_store;
965 md->force_ro.attr.name = "force_ro";
966 md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
967 ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
968 if (ret)
969 del_gendisk(md->disk);
970
971 return ret;
972}
973
6f60c222
AW		 974static const struct mmc_fixup blk_fixups[] =
975{
6a7a6b45
AW		 976 MMC_FIXUP("SEM02G", 0x2, 0x100, add_quirk, MMC_QUIRK_INAND_CMD38),
977 MMC_FIXUP("SEM04G", 0x2, 0x100, add_quirk, MMC_QUIRK_INAND_CMD38),
978 MMC_FIXUP("SEM08G", 0x2, 0x100, add_quirk, MMC_QUIRK_INAND_CMD38),
979 MMC_FIXUP("SEM16G", 0x2, 0x100, add_quirk, MMC_QUIRK_INAND_CMD38),
980 MMC_FIXUP("SEM32G", 0x2, 0x100, add_quirk, MMC_QUIRK_INAND_CMD38),
6f60c222
AW		 981 END_FIXUP
982};
983
1da177e4
LT		 984static int mmc_blk_probe(struct mmc_card *card)
985{
371a689f 986 struct mmc_blk_data *md, *part_md;
1da177e4 987 int err;
a7bbb573
PO		 988 char cap_str[10];
989
912490db
PO		 990 /*
991 * Check that the card supports the command class(es) we need.
992 */
993 if (!(card->csd.cmdclass & CCC_BLOCK_READ))
1da177e4
LT		 994 return -ENODEV;
995
1da177e4
LT		 996 md = mmc_blk_alloc(card);
997 if (IS_ERR(md))
998 return PTR_ERR(md);
999
1000 err = mmc_blk_set_blksize(md, card);
1001 if (err)
1002 goto out;
1003
444122fd 1004 string_get_size((u64)get_capacity(md->disk) << 9, STRING_UNITS_2,
a7bbb573
PO		 1005 cap_str, sizeof(cap_str));
1006 printk(KERN_INFO "%s: %s %s %s %s\n",
1da177e4 1007 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
a7bbb573 1008 cap_str, md->read_only ? "(ro)" : "");
1da177e4 1009
371a689f
AW		 1010 if (mmc_blk_alloc_parts(card, md))
1011 goto out;
1012
1da177e4 1013 mmc_set_drvdata(card, md);
6f60c222
AW		 1014 mmc_fixup_device(card, blk_fixups);
1015
371a689f
AW		 1016 if (mmc_add_disk(md))
1017 goto out;
1018
1019 list_for_each_entry(part_md, &md->part, part) {
1020 if (mmc_add_disk(part_md))
1021 goto out;
1022 }
1da177e4
LT		 1023 return 0;
1024
1025 out:
371a689f
AW		 1026 mmc_blk_remove_parts(card, md);
1027 mmc_blk_remove_req(md);
1da177e4
LT		 1028 return err;
1029}
1030
1031static void mmc_blk_remove(struct mmc_card *card)
1032{
1033 struct mmc_blk_data *md = mmc_get_drvdata(card);
1034
371a689f
AW		 1035 mmc_blk_remove_parts(card, md);
1036 mmc_blk_remove_req(md);
1da177e4
LT		 1037 mmc_set_drvdata(card, NULL);
1038}
1039
1040#ifdef CONFIG_PM
1041static int mmc_blk_suspend(struct mmc_card *card, pm_message_t state)
1042{
371a689f 1043 struct mmc_blk_data *part_md;
1da177e4
LT		 1044 struct mmc_blk_data *md = mmc_get_drvdata(card);
1045
1046 if (md) {
1047 mmc_queue_suspend(&md->queue);
371a689f
AW		 1048 list_for_each_entry(part_md, &md->part, part) {
1049 mmc_queue_suspend(&part_md->queue);
1050 }
1da177e4
LT		 1051 }
1052 return 0;
1053}
1054
1055static int mmc_blk_resume(struct mmc_card *card)
1056{
371a689f 1057 struct mmc_blk_data *part_md;
1da177e4
LT		 1058 struct mmc_blk_data *md = mmc_get_drvdata(card);
1059
1060 if (md) {
1061 mmc_blk_set_blksize(md, card);
371a689f
AW		 1062
1063 /*
1064 * Resume involves the card going into idle state,
1065 * so current partition is always the main one.
1066 */
1067 md->part_curr = md->part_type;
1da177e4 1068 mmc_queue_resume(&md->queue);
371a689f
AW		 1069 list_for_each_entry(part_md, &md->part, part) {
1070 mmc_queue_resume(&part_md->queue);
1071 }
1da177e4
LT		 1072 }
1073 return 0;
1074}
1075#else
1076#define mmc_blk_suspend NULL
1077#define mmc_blk_resume NULL
1078#endif
1079
1080static struct mmc_driver mmc_driver = {
1081 .drv = {
1082 .name = "mmcblk",
1083 },
1084 .probe = mmc_blk_probe,
1085 .remove = mmc_blk_remove,
1086 .suspend = mmc_blk_suspend,
1087 .resume = mmc_blk_resume,
1088};
1089
1090static int __init mmc_blk_init(void)
1091{
9d4e98e9 1092 int res;
1da177e4 1093
5e71b7a6
OJ		 1094 if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
1095 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
1096
1097 max_devices = 256 / perdev_minors;
1098
fe6b4c88
PO		 1099 res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
1100 if (res)
1da177e4 1101 goto out;
1da177e4 1102
9d4e98e9
AM		 1103 res = mmc_register_driver(&mmc_driver);
1104 if (res)
1105 goto out2;
1da177e4 1106
9d4e98e9
AM		 1107 return 0;
1108 out2:
1109 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
1da177e4
LT		 1110 out:
1111 return res;
1112}
1113
1114static void __exit mmc_blk_exit(void)
1115{
1116 mmc_unregister_driver(&mmc_driver);
fe6b4c88 1117 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
1da177e4
LT		 1118}
1119
1120module_init(mmc_blk_init);
1121module_exit(mmc_blk_exit);
1122
1123MODULE_LICENSE("GPL");
1124MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
1125
kernel source for telekom puls (alcatel/mediatek)