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Commit | Line | Data |
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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 | 45 | MODULE_ALIAS("mmc:block"); |
5e71b7a6 OJ |
46 | #ifdef MODULE_PARAM_PREFIX |
47 | #undef MODULE_PARAM_PREFIX | |
48 | #endif | |
49 | #define MODULE_PARAM_PREFIX "mmcblk." | |
50 | ||
51 | static DEFINE_MUTEX(block_mutex); | |
6b0b6285 | 52 | |
1da177e4 | 53 | /* |
5e71b7a6 OJ |
54 | * The defaults come from config options but can be overriden by module |
55 | * or bootarg options. | |
1da177e4 | 56 | */ |
5e71b7a6 | 57 | static int perdev_minors = CONFIG_MMC_BLOCK_MINORS; |
1dff3144 | 58 | |
5e71b7a6 OJ |
59 | /* |
60 | * We've only got one major, so number of mmcblk devices is | |
61 | * limited to 256 / number of minors per device. | |
62 | */ | |
63 | static int max_devices; | |
64 | ||
65 | /* 256 minors, so at most 256 separate devices */ | |
66 | static DECLARE_BITMAP(dev_use, 256); | |
1da177e4 | 67 | |
1da177e4 LT |
68 | /* |
69 | * There is one mmc_blk_data per slot. | |
70 | */ | |
71 | struct mmc_blk_data { | |
72 | spinlock_t lock; | |
73 | struct gendisk *disk; | |
74 | struct mmc_queue queue; | |
75 | ||
76 | unsigned int usage; | |
a6f6c96b | 77 | unsigned int read_only; |
1da177e4 LT |
78 | }; |
79 | ||
a621aaed | 80 | static DEFINE_MUTEX(open_lock); |
1da177e4 | 81 | |
5e71b7a6 OJ |
82 | module_param(perdev_minors, int, 0444); |
83 | MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device"); | |
84 | ||
1da177e4 LT |
85 | static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk) |
86 | { | |
87 | struct mmc_blk_data *md; | |
88 | ||
a621aaed | 89 | mutex_lock(&open_lock); |
1da177e4 LT |
90 | md = disk->private_data; |
91 | if (md && md->usage == 0) | |
92 | md = NULL; | |
93 | if (md) | |
94 | md->usage++; | |
a621aaed | 95 | mutex_unlock(&open_lock); |
1da177e4 LT |
96 | |
97 | return md; | |
98 | } | |
99 | ||
100 | static void mmc_blk_put(struct mmc_blk_data *md) | |
101 | { | |
a621aaed | 102 | mutex_lock(&open_lock); |
1da177e4 LT |
103 | md->usage--; |
104 | if (md->usage == 0) { | |
7d92df69 | 105 | int devmaj = MAJOR(disk_devt(md->disk)); |
5e71b7a6 | 106 | int devidx = MINOR(disk_devt(md->disk)) / perdev_minors; |
7d92df69 AL |
107 | |
108 | if (!devmaj) | |
5e71b7a6 | 109 | devidx = md->disk->first_minor / perdev_minors; |
7d92df69 | 110 | |
5fa83ce2 AH |
111 | blk_cleanup_queue(md->queue.queue); |
112 | ||
1dff3144 DW |
113 | __clear_bit(devidx, dev_use); |
114 | ||
1da177e4 | 115 | put_disk(md->disk); |
1da177e4 LT |
116 | kfree(md); |
117 | } | |
a621aaed | 118 | mutex_unlock(&open_lock); |
1da177e4 LT |
119 | } |
120 | ||
a5a1561f | 121 | static int mmc_blk_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 122 | { |
a5a1561f | 123 | struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk); |
1da177e4 LT |
124 | int ret = -ENXIO; |
125 | ||
2a48fc0a | 126 | mutex_lock(&block_mutex); |
1da177e4 LT |
127 | if (md) { |
128 | if (md->usage == 2) | |
a5a1561f | 129 | check_disk_change(bdev); |
1da177e4 | 130 | ret = 0; |
a00fc090 | 131 | |
a5a1561f | 132 | if ((mode & FMODE_WRITE) && md->read_only) { |
70bb0896 | 133 | mmc_blk_put(md); |
a00fc090 | 134 | ret = -EROFS; |
70bb0896 | 135 | } |
1da177e4 | 136 | } |
2a48fc0a | 137 | mutex_unlock(&block_mutex); |
1da177e4 LT |
138 | |
139 | return ret; | |
140 | } | |
141 | ||
a5a1561f | 142 | static int mmc_blk_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 143 | { |
a5a1561f | 144 | struct mmc_blk_data *md = disk->private_data; |
1da177e4 | 145 | |
2a48fc0a | 146 | mutex_lock(&block_mutex); |
1da177e4 | 147 | mmc_blk_put(md); |
2a48fc0a | 148 | mutex_unlock(&block_mutex); |
1da177e4 LT |
149 | return 0; |
150 | } | |
151 | ||
152 | static int | |
a885c8c4 | 153 | mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
1da177e4 | 154 | { |
a885c8c4 CH |
155 | geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16); |
156 | geo->heads = 4; | |
157 | geo->sectors = 16; | |
158 | return 0; | |
1da177e4 LT |
159 | } |
160 | ||
83d5cde4 | 161 | static const struct block_device_operations mmc_bdops = { |
a5a1561f AV |
162 | .open = mmc_blk_open, |
163 | .release = mmc_blk_release, | |
a885c8c4 | 164 | .getgeo = mmc_blk_getgeo, |
1da177e4 LT |
165 | .owner = THIS_MODULE, |
166 | }; | |
167 | ||
168 | struct mmc_blk_request { | |
169 | struct mmc_request mrq; | |
170 | struct mmc_command cmd; | |
171 | struct mmc_command stop; | |
172 | struct mmc_data data; | |
173 | }; | |
174 | ||
ec5a19dd PO |
175 | static u32 mmc_sd_num_wr_blocks(struct mmc_card *card) |
176 | { | |
177 | int err; | |
051913da BD |
178 | u32 result; |
179 | __be32 *blocks; | |
ec5a19dd PO |
180 | |
181 | struct mmc_request mrq; | |
182 | struct mmc_command cmd; | |
183 | struct mmc_data data; | |
184 | unsigned int timeout_us; | |
185 | ||
186 | struct scatterlist sg; | |
187 | ||
188 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
189 | ||
190 | cmd.opcode = MMC_APP_CMD; | |
191 | cmd.arg = card->rca << 16; | |
7213d175 | 192 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; |
ec5a19dd PO |
193 | |
194 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
7213d175 DB |
195 | if (err) |
196 | return (u32)-1; | |
197 | if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD)) | |
ec5a19dd PO |
198 | return (u32)-1; |
199 | ||
200 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
201 | ||
202 | cmd.opcode = SD_APP_SEND_NUM_WR_BLKS; | |
203 | cmd.arg = 0; | |
7213d175 | 204 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; |
ec5a19dd PO |
205 | |
206 | memset(&data, 0, sizeof(struct mmc_data)); | |
207 | ||
208 | data.timeout_ns = card->csd.tacc_ns * 100; | |
209 | data.timeout_clks = card->csd.tacc_clks * 100; | |
210 | ||
211 | timeout_us = data.timeout_ns / 1000; | |
212 | timeout_us += data.timeout_clks * 1000 / | |
213 | (card->host->ios.clock / 1000); | |
214 | ||
215 | if (timeout_us > 100000) { | |
216 | data.timeout_ns = 100000000; | |
217 | data.timeout_clks = 0; | |
218 | } | |
219 | ||
220 | data.blksz = 4; | |
221 | data.blocks = 1; | |
222 | data.flags = MMC_DATA_READ; | |
223 | data.sg = &sg; | |
224 | data.sg_len = 1; | |
225 | ||
226 | memset(&mrq, 0, sizeof(struct mmc_request)); | |
227 | ||
228 | mrq.cmd = &cmd; | |
229 | mrq.data = &data; | |
230 | ||
051913da BD |
231 | blocks = kmalloc(4, GFP_KERNEL); |
232 | if (!blocks) | |
233 | return (u32)-1; | |
234 | ||
235 | sg_init_one(&sg, blocks, 4); | |
ec5a19dd PO |
236 | |
237 | mmc_wait_for_req(card->host, &mrq); | |
238 | ||
051913da BD |
239 | result = ntohl(*blocks); |
240 | kfree(blocks); | |
241 | ||
17b0429d | 242 | if (cmd.error || data.error) |
051913da | 243 | result = (u32)-1; |
ec5a19dd | 244 | |
051913da | 245 | return result; |
ec5a19dd PO |
246 | } |
247 | ||
504f191f AH |
248 | static u32 get_card_status(struct mmc_card *card, struct request *req) |
249 | { | |
250 | struct mmc_command cmd; | |
251 | int err; | |
252 | ||
253 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
254 | cmd.opcode = MMC_SEND_STATUS; | |
255 | if (!mmc_host_is_spi(card->host)) | |
256 | cmd.arg = card->rca << 16; | |
257 | cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC; | |
258 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
259 | if (err) | |
260 | printk(KERN_ERR "%s: error %d sending status comand", | |
261 | req->rq_disk->disk_name, err); | |
262 | return cmd.resp[0]; | |
263 | } | |
264 | ||
bd788c96 AH |
265 | static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req) |
266 | { | |
267 | struct mmc_blk_data *md = mq->data; | |
268 | struct mmc_card *card = md->queue.card; | |
269 | unsigned int from, nr, arg; | |
270 | int err = 0; | |
271 | ||
272 | mmc_claim_host(card->host); | |
273 | ||
274 | if (!mmc_can_erase(card)) { | |
275 | err = -EOPNOTSUPP; | |
276 | goto out; | |
277 | } | |
278 | ||
279 | from = blk_rq_pos(req); | |
280 | nr = blk_rq_sectors(req); | |
281 | ||
282 | if (mmc_can_trim(card)) | |
283 | arg = MMC_TRIM_ARG; | |
284 | else | |
285 | arg = MMC_ERASE_ARG; | |
286 | ||
287 | err = mmc_erase(card, from, nr, arg); | |
288 | out: | |
289 | spin_lock_irq(&md->lock); | |
290 | __blk_end_request(req, err, blk_rq_bytes(req)); | |
291 | spin_unlock_irq(&md->lock); | |
292 | ||
293 | mmc_release_host(card->host); | |
294 | ||
295 | return err ? 0 : 1; | |
296 | } | |
297 | ||
49804548 AH |
298 | static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq, |
299 | struct request *req) | |
300 | { | |
301 | struct mmc_blk_data *md = mq->data; | |
302 | struct mmc_card *card = md->queue.card; | |
303 | unsigned int from, nr, arg; | |
304 | int err = 0; | |
305 | ||
306 | mmc_claim_host(card->host); | |
307 | ||
308 | if (!mmc_can_secure_erase_trim(card)) { | |
309 | err = -EOPNOTSUPP; | |
310 | goto out; | |
311 | } | |
312 | ||
313 | from = blk_rq_pos(req); | |
314 | nr = blk_rq_sectors(req); | |
315 | ||
316 | if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr)) | |
317 | arg = MMC_SECURE_TRIM1_ARG; | |
318 | else | |
319 | arg = MMC_SECURE_ERASE_ARG; | |
320 | ||
321 | err = mmc_erase(card, from, nr, arg); | |
322 | if (!err && arg == MMC_SECURE_TRIM1_ARG) | |
323 | err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG); | |
324 | out: | |
325 | spin_lock_irq(&md->lock); | |
326 | __blk_end_request(req, err, blk_rq_bytes(req)); | |
327 | spin_unlock_irq(&md->lock); | |
328 | ||
329 | mmc_release_host(card->host); | |
330 | ||
331 | return err ? 0 : 1; | |
332 | } | |
333 | ||
bd788c96 | 334 | static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *req) |
1da177e4 LT |
335 | { |
336 | struct mmc_blk_data *md = mq->data; | |
337 | struct mmc_card *card = md->queue.card; | |
176f00ff | 338 | struct mmc_blk_request brq; |
6a79e391 | 339 | int ret = 1, disable_multi = 0; |
1da177e4 | 340 | |
b855885e | 341 | mmc_claim_host(card->host); |
1da177e4 LT |
342 | |
343 | do { | |
1da177e4 | 344 | struct mmc_command cmd; |
504f191f | 345 | u32 readcmd, writecmd, status = 0; |
1da177e4 LT |
346 | |
347 | memset(&brq, 0, sizeof(struct mmc_blk_request)); | |
348 | brq.mrq.cmd = &brq.cmd; | |
349 | brq.mrq.data = &brq.data; | |
350 | ||
83096ebf | 351 | brq.cmd.arg = blk_rq_pos(req); |
fba68bd2 PL |
352 | if (!mmc_card_blockaddr(card)) |
353 | brq.cmd.arg <<= 9; | |
7213d175 | 354 | brq.cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; |
08846698 | 355 | brq.data.blksz = 512; |
1da177e4 LT |
356 | brq.stop.opcode = MMC_STOP_TRANSMISSION; |
357 | brq.stop.arg = 0; | |
7213d175 | 358 | brq.stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC; |
83096ebf | 359 | brq.data.blocks = blk_rq_sectors(req); |
1da177e4 | 360 | |
548d2de9 PO |
361 | /* |
362 | * The block layer doesn't support all sector count | |
363 | * restrictions, so we need to be prepared for too big | |
364 | * requests. | |
365 | */ | |
366 | if (brq.data.blocks > card->host->max_blk_count) | |
367 | brq.data.blocks = card->host->max_blk_count; | |
368 | ||
6a79e391 AH |
369 | /* |
370 | * After a read error, we redo the request one sector at a time | |
371 | * in order to accurately determine which sectors can be read | |
372 | * successfully. | |
373 | */ | |
374 | if (disable_multi && brq.data.blocks > 1) | |
375 | brq.data.blocks = 1; | |
376 | ||
788ee7b0 | 377 | if (brq.data.blocks > 1) { |
7213d175 DB |
378 | /* SPI multiblock writes terminate using a special |
379 | * token, not a STOP_TRANSMISSION request. | |
380 | */ | |
381 | if (!mmc_host_is_spi(card->host) | |
382 | || rq_data_dir(req) == READ) | |
383 | brq.mrq.stop = &brq.stop; | |
db53f28b RK |
384 | readcmd = MMC_READ_MULTIPLE_BLOCK; |
385 | writecmd = MMC_WRITE_MULTIPLE_BLOCK; | |
788ee7b0 RK |
386 | } else { |
387 | brq.mrq.stop = NULL; | |
db53f28b RK |
388 | readcmd = MMC_READ_SINGLE_BLOCK; |
389 | writecmd = MMC_WRITE_BLOCK; | |
390 | } | |
db53f28b RK |
391 | if (rq_data_dir(req) == READ) { |
392 | brq.cmd.opcode = readcmd; | |
393 | brq.data.flags |= MMC_DATA_READ; | |
394 | } else { | |
395 | brq.cmd.opcode = writecmd; | |
396 | brq.data.flags |= MMC_DATA_WRITE; | |
788ee7b0 | 397 | } |
1da177e4 | 398 | |
b146d26a PO |
399 | mmc_set_data_timeout(&brq.data, card); |
400 | ||
1da177e4 | 401 | brq.data.sg = mq->sg; |
98ccf149 PO |
402 | brq.data.sg_len = mmc_queue_map_sg(mq); |
403 | ||
6a79e391 AH |
404 | /* |
405 | * Adjust the sg list so it is the same size as the | |
406 | * request. | |
407 | */ | |
83096ebf | 408 | if (brq.data.blocks != blk_rq_sectors(req)) { |
6a79e391 AH |
409 | int i, data_size = brq.data.blocks << 9; |
410 | struct scatterlist *sg; | |
411 | ||
412 | for_each_sg(brq.data.sg, sg, brq.data.sg_len, i) { | |
413 | data_size -= sg->length; | |
414 | if (data_size <= 0) { | |
415 | sg->length += data_size; | |
416 | i++; | |
417 | break; | |
418 | } | |
419 | } | |
420 | brq.data.sg_len = i; | |
421 | } | |
422 | ||
98ccf149 | 423 | mmc_queue_bounce_pre(mq); |
1da177e4 LT |
424 | |
425 | mmc_wait_for_req(card->host, &brq.mrq); | |
98ccf149 PO |
426 | |
427 | mmc_queue_bounce_post(mq); | |
428 | ||
979ce720 PO |
429 | /* |
430 | * Check for errors here, but don't jump to cmd_err | |
431 | * until later as we need to wait for the card to leave | |
432 | * programming mode even when things go wrong. | |
433 | */ | |
6a79e391 AH |
434 | if (brq.cmd.error || brq.data.error || brq.stop.error) { |
435 | if (brq.data.blocks > 1 && rq_data_dir(req) == READ) { | |
436 | /* Redo read one sector at a time */ | |
437 | printk(KERN_WARNING "%s: retrying using single " | |
438 | "block read\n", req->rq_disk->disk_name); | |
439 | disable_multi = 1; | |
440 | continue; | |
441 | } | |
504f191f | 442 | status = get_card_status(card, req); |
6a79e391 | 443 | } |
504f191f | 444 | |
1da177e4 | 445 | if (brq.cmd.error) { |
504f191f AH |
446 | printk(KERN_ERR "%s: error %d sending read/write " |
447 | "command, response %#x, card status %#x\n", | |
448 | req->rq_disk->disk_name, brq.cmd.error, | |
449 | brq.cmd.resp[0], status); | |
1da177e4 LT |
450 | } |
451 | ||
452 | if (brq.data.error) { | |
504f191f AH |
453 | if (brq.data.error == -ETIMEDOUT && brq.mrq.stop) |
454 | /* 'Stop' response contains card status */ | |
455 | status = brq.mrq.stop->resp[0]; | |
456 | printk(KERN_ERR "%s: error %d transferring data," | |
457 | " sector %u, nr %u, card status %#x\n", | |
458 | req->rq_disk->disk_name, brq.data.error, | |
83096ebf TH |
459 | (unsigned)blk_rq_pos(req), |
460 | (unsigned)blk_rq_sectors(req), status); | |
1da177e4 LT |
461 | } |
462 | ||
463 | if (brq.stop.error) { | |
504f191f AH |
464 | printk(KERN_ERR "%s: error %d sending stop command, " |
465 | "response %#x, card status %#x\n", | |
466 | req->rq_disk->disk_name, brq.stop.error, | |
467 | brq.stop.resp[0], status); | |
1da177e4 LT |
468 | } |
469 | ||
7213d175 | 470 | if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) { |
2ed6d22c RK |
471 | do { |
472 | int err; | |
473 | ||
474 | cmd.opcode = MMC_SEND_STATUS; | |
475 | cmd.arg = card->rca << 16; | |
476 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; | |
477 | err = mmc_wait_for_cmd(card->host, &cmd, 5); | |
478 | if (err) { | |
479 | printk(KERN_ERR "%s: error %d requesting status\n", | |
480 | req->rq_disk->disk_name, err); | |
481 | goto cmd_err; | |
482 | } | |
d198f101 PO |
483 | /* |
484 | * Some cards mishandle the status bits, | |
485 | * so make sure to check both the busy | |
486 | * indication and the card state. | |
487 | */ | |
488 | } while (!(cmd.resp[0] & R1_READY_FOR_DATA) || | |
489 | (R1_CURRENT_STATE(cmd.resp[0]) == 7)); | |
1da177e4 LT |
490 | |
491 | #if 0 | |
2ed6d22c RK |
492 | if (cmd.resp[0] & ~0x00000900) |
493 | printk(KERN_ERR "%s: status = %08x\n", | |
494 | req->rq_disk->disk_name, cmd.resp[0]); | |
495 | if (mmc_decode_status(cmd.resp)) | |
496 | goto cmd_err; | |
1da177e4 | 497 | #endif |
2ed6d22c | 498 | } |
1da177e4 | 499 | |
6a79e391 AH |
500 | if (brq.cmd.error || brq.stop.error || brq.data.error) { |
501 | if (rq_data_dir(req) == READ) { | |
502 | /* | |
503 | * After an error, we redo I/O one sector at a | |
504 | * time, so we only reach here after trying to | |
505 | * read a single sector. | |
506 | */ | |
507 | spin_lock_irq(&md->lock); | |
508 | ret = __blk_end_request(req, -EIO, brq.data.blksz); | |
509 | spin_unlock_irq(&md->lock); | |
510 | continue; | |
511 | } | |
979ce720 | 512 | goto cmd_err; |
6a79e391 | 513 | } |
979ce720 | 514 | |
1da177e4 LT |
515 | /* |
516 | * A block was successfully transferred. | |
517 | */ | |
518 | spin_lock_irq(&md->lock); | |
fd539832 | 519 | ret = __blk_end_request(req, 0, brq.data.bytes_xfered); |
1da177e4 LT |
520 | spin_unlock_irq(&md->lock); |
521 | } while (ret); | |
522 | ||
b855885e | 523 | mmc_release_host(card->host); |
1da177e4 LT |
524 | |
525 | return 1; | |
526 | ||
527 | cmd_err: | |
ec5a19dd PO |
528 | /* |
529 | * If this is an SD card and we're writing, we can first | |
530 | * mark the known good sectors as ok. | |
531 | * | |
532 | * If the card is not SD, we can still ok written sectors | |
23af6039 PO |
533 | * as reported by the controller (which might be less than |
534 | * the real number of written sectors, but never more). | |
1da177e4 | 535 | */ |
6a79e391 AH |
536 | if (mmc_card_sd(card)) { |
537 | u32 blocks; | |
23af6039 | 538 | |
6a79e391 AH |
539 | blocks = mmc_sd_num_wr_blocks(card); |
540 | if (blocks != (u32)-1) { | |
ec5a19dd | 541 | spin_lock_irq(&md->lock); |
6a79e391 | 542 | ret = __blk_end_request(req, 0, blocks << 9); |
ec5a19dd PO |
543 | spin_unlock_irq(&md->lock); |
544 | } | |
6a79e391 AH |
545 | } else { |
546 | spin_lock_irq(&md->lock); | |
547 | ret = __blk_end_request(req, 0, brq.data.bytes_xfered); | |
548 | spin_unlock_irq(&md->lock); | |
176f00ff PO |
549 | } |
550 | ||
b855885e | 551 | mmc_release_host(card->host); |
ec5a19dd | 552 | |
1da177e4 | 553 | spin_lock_irq(&md->lock); |
fd539832 KU |
554 | while (ret) |
555 | ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req)); | |
1da177e4 LT |
556 | spin_unlock_irq(&md->lock); |
557 | ||
558 | return 0; | |
559 | } | |
560 | ||
bd788c96 AH |
561 | static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) |
562 | { | |
49804548 AH |
563 | if (req->cmd_flags & REQ_DISCARD) { |
564 | if (req->cmd_flags & REQ_SECURE) | |
565 | return mmc_blk_issue_secdiscard_rq(mq, req); | |
566 | else | |
567 | return mmc_blk_issue_discard_rq(mq, req); | |
568 | } else { | |
bd788c96 | 569 | return mmc_blk_issue_rw_rq(mq, req); |
49804548 | 570 | } |
bd788c96 | 571 | } |
1da177e4 | 572 | |
a6f6c96b RK |
573 | static inline int mmc_blk_readonly(struct mmc_card *card) |
574 | { | |
575 | return mmc_card_readonly(card) || | |
576 | !(card->csd.cmdclass & CCC_BLOCK_WRITE); | |
577 | } | |
578 | ||
1da177e4 LT |
579 | static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card) |
580 | { | |
581 | struct mmc_blk_data *md; | |
582 | int devidx, ret; | |
583 | ||
5e71b7a6 OJ |
584 | devidx = find_first_zero_bit(dev_use, max_devices); |
585 | if (devidx >= max_devices) | |
1da177e4 LT |
586 | return ERR_PTR(-ENOSPC); |
587 | __set_bit(devidx, dev_use); | |
588 | ||
dd00cc48 | 589 | md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL); |
a6f6c96b RK |
590 | if (!md) { |
591 | ret = -ENOMEM; | |
592 | goto out; | |
593 | } | |
1da177e4 | 594 | |
1da177e4 | 595 | |
a6f6c96b RK |
596 | /* |
597 | * Set the read-only status based on the supported commands | |
598 | * and the write protect switch. | |
599 | */ | |
600 | md->read_only = mmc_blk_readonly(card); | |
1da177e4 | 601 | |
5e71b7a6 | 602 | md->disk = alloc_disk(perdev_minors); |
a6f6c96b RK |
603 | if (md->disk == NULL) { |
604 | ret = -ENOMEM; | |
605 | goto err_kfree; | |
606 | } | |
1da177e4 | 607 | |
a6f6c96b RK |
608 | spin_lock_init(&md->lock); |
609 | md->usage = 1; | |
1da177e4 | 610 | |
a6f6c96b RK |
611 | ret = mmc_init_queue(&md->queue, card, &md->lock); |
612 | if (ret) | |
613 | goto err_putdisk; | |
1da177e4 | 614 | |
a6f6c96b RK |
615 | md->queue.issue_fn = mmc_blk_issue_rq; |
616 | md->queue.data = md; | |
d2b18394 | 617 | |
fe6b4c88 | 618 | md->disk->major = MMC_BLOCK_MAJOR; |
5e71b7a6 | 619 | md->disk->first_minor = devidx * perdev_minors; |
a6f6c96b RK |
620 | md->disk->fops = &mmc_bdops; |
621 | md->disk->private_data = md; | |
622 | md->disk->queue = md->queue.queue; | |
623 | md->disk->driverfs_dev = &card->dev; | |
624 | ||
625 | /* | |
626 | * As discussed on lkml, GENHD_FL_REMOVABLE should: | |
627 | * | |
628 | * - be set for removable media with permanent block devices | |
629 | * - be unset for removable block devices with permanent media | |
630 | * | |
631 | * Since MMC block devices clearly fall under the second | |
632 | * case, we do not set GENHD_FL_REMOVABLE. Userspace | |
633 | * should use the block device creation/destruction hotplug | |
634 | * messages to tell when the card is present. | |
635 | */ | |
636 | ||
12578f66 J |
637 | snprintf(md->disk->disk_name, sizeof(md->disk->disk_name), |
638 | "mmcblk%d", devidx); | |
a6f6c96b | 639 | |
e1defc4f | 640 | blk_queue_logical_block_size(md->queue.queue, 512); |
a6f6c96b | 641 | |
85a18ad9 PO |
642 | if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) { |
643 | /* | |
644 | * The EXT_CSD sector count is in number or 512 byte | |
645 | * sectors. | |
646 | */ | |
647 | set_capacity(md->disk, card->ext_csd.sectors); | |
648 | } else { | |
649 | /* | |
650 | * The CSD capacity field is in units of read_blkbits. | |
651 | * set_capacity takes units of 512 bytes. | |
652 | */ | |
653 | set_capacity(md->disk, | |
654 | card->csd.capacity << (card->csd.read_blkbits - 9)); | |
655 | } | |
1da177e4 | 656 | return md; |
a6f6c96b RK |
657 | |
658 | err_putdisk: | |
659 | put_disk(md->disk); | |
660 | err_kfree: | |
661 | kfree(md); | |
662 | out: | |
663 | return ERR_PTR(ret); | |
1da177e4 LT |
664 | } |
665 | ||
666 | static int | |
667 | mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card) | |
668 | { | |
1da177e4 LT |
669 | int err; |
670 | ||
b855885e | 671 | mmc_claim_host(card->host); |
0f8d8ea6 | 672 | err = mmc_set_blocklen(card, 512); |
b855885e | 673 | mmc_release_host(card->host); |
1da177e4 LT |
674 | |
675 | if (err) { | |
0f8d8ea6 AH |
676 | printk(KERN_ERR "%s: unable to set block size to 512: %d\n", |
677 | md->disk->disk_name, err); | |
1da177e4 LT |
678 | return -EINVAL; |
679 | } | |
680 | ||
681 | return 0; | |
682 | } | |
683 | ||
684 | static int mmc_blk_probe(struct mmc_card *card) | |
685 | { | |
686 | struct mmc_blk_data *md; | |
687 | int err; | |
a7bbb573 PO |
688 | char cap_str[10]; |
689 | ||
912490db PO |
690 | /* |
691 | * Check that the card supports the command class(es) we need. | |
692 | */ | |
693 | if (!(card->csd.cmdclass & CCC_BLOCK_READ)) | |
1da177e4 LT |
694 | return -ENODEV; |
695 | ||
1da177e4 LT |
696 | md = mmc_blk_alloc(card); |
697 | if (IS_ERR(md)) | |
698 | return PTR_ERR(md); | |
699 | ||
700 | err = mmc_blk_set_blksize(md, card); | |
701 | if (err) | |
702 | goto out; | |
703 | ||
444122fd | 704 | string_get_size((u64)get_capacity(md->disk) << 9, STRING_UNITS_2, |
a7bbb573 PO |
705 | cap_str, sizeof(cap_str)); |
706 | printk(KERN_INFO "%s: %s %s %s %s\n", | |
1da177e4 | 707 | md->disk->disk_name, mmc_card_id(card), mmc_card_name(card), |
a7bbb573 | 708 | cap_str, md->read_only ? "(ro)" : ""); |
1da177e4 LT |
709 | |
710 | mmc_set_drvdata(card, md); | |
711 | add_disk(md->disk); | |
712 | return 0; | |
713 | ||
714 | out: | |
0a74ff29 | 715 | mmc_cleanup_queue(&md->queue); |
1da177e4 LT |
716 | mmc_blk_put(md); |
717 | ||
718 | return err; | |
719 | } | |
720 | ||
721 | static void mmc_blk_remove(struct mmc_card *card) | |
722 | { | |
723 | struct mmc_blk_data *md = mmc_get_drvdata(card); | |
724 | ||
725 | if (md) { | |
89b4e133 | 726 | /* Stop new requests from getting into the queue */ |
1da177e4 LT |
727 | del_gendisk(md->disk); |
728 | ||
89b4e133 PO |
729 | /* Then flush out any already in there */ |
730 | mmc_cleanup_queue(&md->queue); | |
1da177e4 | 731 | |
1da177e4 LT |
732 | mmc_blk_put(md); |
733 | } | |
734 | mmc_set_drvdata(card, NULL); | |
735 | } | |
736 | ||
737 | #ifdef CONFIG_PM | |
738 | static int mmc_blk_suspend(struct mmc_card *card, pm_message_t state) | |
739 | { | |
740 | struct mmc_blk_data *md = mmc_get_drvdata(card); | |
741 | ||
742 | if (md) { | |
743 | mmc_queue_suspend(&md->queue); | |
744 | } | |
745 | return 0; | |
746 | } | |
747 | ||
748 | static int mmc_blk_resume(struct mmc_card *card) | |
749 | { | |
750 | struct mmc_blk_data *md = mmc_get_drvdata(card); | |
751 | ||
752 | if (md) { | |
753 | mmc_blk_set_blksize(md, card); | |
754 | mmc_queue_resume(&md->queue); | |
755 | } | |
756 | return 0; | |
757 | } | |
758 | #else | |
759 | #define mmc_blk_suspend NULL | |
760 | #define mmc_blk_resume NULL | |
761 | #endif | |
762 | ||
763 | static struct mmc_driver mmc_driver = { | |
764 | .drv = { | |
765 | .name = "mmcblk", | |
766 | }, | |
767 | .probe = mmc_blk_probe, | |
768 | .remove = mmc_blk_remove, | |
769 | .suspend = mmc_blk_suspend, | |
770 | .resume = mmc_blk_resume, | |
771 | }; | |
772 | ||
773 | static int __init mmc_blk_init(void) | |
774 | { | |
9d4e98e9 | 775 | int res; |
1da177e4 | 776 | |
5e71b7a6 OJ |
777 | if (perdev_minors != CONFIG_MMC_BLOCK_MINORS) |
778 | pr_info("mmcblk: using %d minors per device\n", perdev_minors); | |
779 | ||
780 | max_devices = 256 / perdev_minors; | |
781 | ||
fe6b4c88 PO |
782 | res = register_blkdev(MMC_BLOCK_MAJOR, "mmc"); |
783 | if (res) | |
1da177e4 | 784 | goto out; |
1da177e4 | 785 | |
9d4e98e9 AM |
786 | res = mmc_register_driver(&mmc_driver); |
787 | if (res) | |
788 | goto out2; | |
1da177e4 | 789 | |
9d4e98e9 AM |
790 | return 0; |
791 | out2: | |
792 | unregister_blkdev(MMC_BLOCK_MAJOR, "mmc"); | |
1da177e4 LT |
793 | out: |
794 | return res; | |
795 | } | |
796 | ||
797 | static void __exit mmc_blk_exit(void) | |
798 | { | |
799 | mmc_unregister_driver(&mmc_driver); | |
fe6b4c88 | 800 | unregister_blkdev(MMC_BLOCK_MAJOR, "mmc"); |
1da177e4 LT |
801 | } |
802 | ||
803 | module_init(mmc_blk_init); | |
804 | module_exit(mmc_blk_exit); | |
805 | ||
806 | MODULE_LICENSE("GPL"); | |
807 | MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver"); | |
808 |