]>
Commit | Line | Data |
---|---|---|
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> |
6e9624b8 | 32 | #include <linux/smp_lock.h> |
ec5a19dd | 33 | #include <linux/scatterlist.h> |
a7bbb573 | 34 | #include <linux/string_helpers.h> |
1da177e4 LT |
35 | |
36 | #include <linux/mmc/card.h> | |
385e3227 | 37 | #include <linux/mmc/host.h> |
da7fbe58 PO |
38 | #include <linux/mmc/mmc.h> |
39 | #include <linux/mmc/sd.h> | |
1da177e4 LT |
40 | |
41 | #include <asm/system.h> | |
42 | #include <asm/uaccess.h> | |
43 | ||
98ac2162 | 44 | #include "queue.h" |
1da177e4 | 45 | |
6b0b6285 AW |
46 | MODULE_ALIAS("mmc:block"); |
47 | ||
1da177e4 LT |
48 | /* |
49 | * max 8 partitions per card | |
50 | */ | |
51 | #define MMC_SHIFT 3 | |
1dff3144 DW |
52 | #define MMC_NUM_MINORS (256 >> MMC_SHIFT) |
53 | ||
203c8018 | 54 | static DECLARE_BITMAP(dev_use, MMC_NUM_MINORS); |
1da177e4 | 55 | |
1da177e4 LT |
56 | /* |
57 | * There is one mmc_blk_data per slot. | |
58 | */ | |
59 | struct mmc_blk_data { | |
60 | spinlock_t lock; | |
61 | struct gendisk *disk; | |
62 | struct mmc_queue queue; | |
63 | ||
64 | unsigned int usage; | |
a6f6c96b | 65 | unsigned int read_only; |
1da177e4 LT |
66 | }; |
67 | ||
a621aaed | 68 | static DEFINE_MUTEX(open_lock); |
1da177e4 LT |
69 | |
70 | static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk) | |
71 | { | |
72 | struct mmc_blk_data *md; | |
73 | ||
a621aaed | 74 | mutex_lock(&open_lock); |
1da177e4 LT |
75 | md = disk->private_data; |
76 | if (md && md->usage == 0) | |
77 | md = NULL; | |
78 | if (md) | |
79 | md->usage++; | |
a621aaed | 80 | mutex_unlock(&open_lock); |
1da177e4 LT |
81 | |
82 | return md; | |
83 | } | |
84 | ||
85 | static void mmc_blk_put(struct mmc_blk_data *md) | |
86 | { | |
a621aaed | 87 | mutex_lock(&open_lock); |
1da177e4 LT |
88 | md->usage--; |
89 | if (md->usage == 0) { | |
7d92df69 | 90 | int devmaj = MAJOR(disk_devt(md->disk)); |
f331c029 | 91 | int devidx = MINOR(disk_devt(md->disk)) >> MMC_SHIFT; |
7d92df69 AL |
92 | |
93 | if (!devmaj) | |
94 | devidx = md->disk->first_minor >> MMC_SHIFT; | |
95 | ||
5fa83ce2 AH |
96 | blk_cleanup_queue(md->queue.queue); |
97 | ||
1dff3144 DW |
98 | __clear_bit(devidx, dev_use); |
99 | ||
1da177e4 | 100 | put_disk(md->disk); |
1da177e4 LT |
101 | kfree(md); |
102 | } | |
a621aaed | 103 | mutex_unlock(&open_lock); |
1da177e4 LT |
104 | } |
105 | ||
a5a1561f | 106 | static int mmc_blk_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 107 | { |
a5a1561f | 108 | struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk); |
1da177e4 LT |
109 | int ret = -ENXIO; |
110 | ||
6e9624b8 | 111 | lock_kernel(); |
1da177e4 LT |
112 | if (md) { |
113 | if (md->usage == 2) | |
a5a1561f | 114 | check_disk_change(bdev); |
1da177e4 | 115 | ret = 0; |
a00fc090 | 116 | |
a5a1561f | 117 | if ((mode & FMODE_WRITE) && md->read_only) { |
70bb0896 | 118 | mmc_blk_put(md); |
a00fc090 | 119 | ret = -EROFS; |
70bb0896 | 120 | } |
1da177e4 | 121 | } |
6e9624b8 | 122 | unlock_kernel(); |
1da177e4 LT |
123 | |
124 | return ret; | |
125 | } | |
126 | ||
a5a1561f | 127 | static int mmc_blk_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 128 | { |
a5a1561f | 129 | struct mmc_blk_data *md = disk->private_data; |
1da177e4 | 130 | |
6e9624b8 | 131 | lock_kernel(); |
1da177e4 | 132 | mmc_blk_put(md); |
6e9624b8 | 133 | unlock_kernel(); |
1da177e4 LT |
134 | return 0; |
135 | } | |
136 | ||
137 | static int | |
a885c8c4 | 138 | mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
1da177e4 | 139 | { |
a885c8c4 CH |
140 | geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16); |
141 | geo->heads = 4; | |
142 | geo->sectors = 16; | |
143 | return 0; | |
1da177e4 LT |
144 | } |
145 | ||
83d5cde4 | 146 | static const struct block_device_operations mmc_bdops = { |
a5a1561f AV |
147 | .open = mmc_blk_open, |
148 | .release = mmc_blk_release, | |
a885c8c4 | 149 | .getgeo = mmc_blk_getgeo, |
1da177e4 LT |
150 | .owner = THIS_MODULE, |
151 | }; | |
152 | ||
153 | struct mmc_blk_request { | |
154 | struct mmc_request mrq; | |
155 | struct mmc_command cmd; | |
156 | struct mmc_command stop; | |
157 | struct mmc_data data; | |
158 | }; | |
159 | ||
ec5a19dd PO |
160 | static u32 mmc_sd_num_wr_blocks(struct mmc_card *card) |
161 | { | |
162 | int err; | |
051913da BD |
163 | u32 result; |
164 | __be32 *blocks; | |
ec5a19dd PO |
165 | |
166 | struct mmc_request mrq; | |
167 | struct mmc_command cmd; | |
168 | struct mmc_data data; | |
169 | unsigned int timeout_us; | |
170 | ||
171 | struct scatterlist sg; | |
172 | ||
173 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
174 | ||
175 | cmd.opcode = MMC_APP_CMD; | |
176 | cmd.arg = card->rca << 16; | |
7213d175 | 177 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; |
ec5a19dd PO |
178 | |
179 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
7213d175 DB |
180 | if (err) |
181 | return (u32)-1; | |
182 | if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD)) | |
ec5a19dd PO |
183 | return (u32)-1; |
184 | ||
185 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
186 | ||
187 | cmd.opcode = SD_APP_SEND_NUM_WR_BLKS; | |
188 | cmd.arg = 0; | |
7213d175 | 189 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; |
ec5a19dd PO |
190 | |
191 | memset(&data, 0, sizeof(struct mmc_data)); | |
192 | ||
193 | data.timeout_ns = card->csd.tacc_ns * 100; | |
194 | data.timeout_clks = card->csd.tacc_clks * 100; | |
195 | ||
196 | timeout_us = data.timeout_ns / 1000; | |
197 | timeout_us += data.timeout_clks * 1000 / | |
198 | (card->host->ios.clock / 1000); | |
199 | ||
200 | if (timeout_us > 100000) { | |
201 | data.timeout_ns = 100000000; | |
202 | data.timeout_clks = 0; | |
203 | } | |
204 | ||
205 | data.blksz = 4; | |
206 | data.blocks = 1; | |
207 | data.flags = MMC_DATA_READ; | |
208 | data.sg = &sg; | |
209 | data.sg_len = 1; | |
210 | ||
211 | memset(&mrq, 0, sizeof(struct mmc_request)); | |
212 | ||
213 | mrq.cmd = &cmd; | |
214 | mrq.data = &data; | |
215 | ||
051913da BD |
216 | blocks = kmalloc(4, GFP_KERNEL); |
217 | if (!blocks) | |
218 | return (u32)-1; | |
219 | ||
220 | sg_init_one(&sg, blocks, 4); | |
ec5a19dd PO |
221 | |
222 | mmc_wait_for_req(card->host, &mrq); | |
223 | ||
051913da BD |
224 | result = ntohl(*blocks); |
225 | kfree(blocks); | |
226 | ||
17b0429d | 227 | if (cmd.error || data.error) |
051913da | 228 | result = (u32)-1; |
ec5a19dd | 229 | |
051913da | 230 | return result; |
ec5a19dd PO |
231 | } |
232 | ||
504f191f AH |
233 | static u32 get_card_status(struct mmc_card *card, struct request *req) |
234 | { | |
235 | struct mmc_command cmd; | |
236 | int err; | |
237 | ||
238 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
239 | cmd.opcode = MMC_SEND_STATUS; | |
240 | if (!mmc_host_is_spi(card->host)) | |
241 | cmd.arg = card->rca << 16; | |
242 | cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC; | |
243 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
244 | if (err) | |
245 | printk(KERN_ERR "%s: error %d sending status comand", | |
246 | req->rq_disk->disk_name, err); | |
247 | return cmd.resp[0]; | |
248 | } | |
249 | ||
bd788c96 AH |
250 | static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req) |
251 | { | |
252 | struct mmc_blk_data *md = mq->data; | |
253 | struct mmc_card *card = md->queue.card; | |
254 | unsigned int from, nr, arg; | |
255 | int err = 0; | |
256 | ||
257 | mmc_claim_host(card->host); | |
258 | ||
259 | if (!mmc_can_erase(card)) { | |
260 | err = -EOPNOTSUPP; | |
261 | goto out; | |
262 | } | |
263 | ||
264 | from = blk_rq_pos(req); | |
265 | nr = blk_rq_sectors(req); | |
266 | ||
267 | if (mmc_can_trim(card)) | |
268 | arg = MMC_TRIM_ARG; | |
269 | else | |
270 | arg = MMC_ERASE_ARG; | |
271 | ||
272 | err = mmc_erase(card, from, nr, arg); | |
273 | out: | |
274 | spin_lock_irq(&md->lock); | |
275 | __blk_end_request(req, err, blk_rq_bytes(req)); | |
276 | spin_unlock_irq(&md->lock); | |
277 | ||
278 | mmc_release_host(card->host); | |
279 | ||
280 | return err ? 0 : 1; | |
281 | } | |
282 | ||
49804548 AH |
283 | static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq, |
284 | struct request *req) | |
285 | { | |
286 | struct mmc_blk_data *md = mq->data; | |
287 | struct mmc_card *card = md->queue.card; | |
288 | unsigned int from, nr, arg; | |
289 | int err = 0; | |
290 | ||
291 | mmc_claim_host(card->host); | |
292 | ||
293 | if (!mmc_can_secure_erase_trim(card)) { | |
294 | err = -EOPNOTSUPP; | |
295 | goto out; | |
296 | } | |
297 | ||
298 | from = blk_rq_pos(req); | |
299 | nr = blk_rq_sectors(req); | |
300 | ||
301 | if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr)) | |
302 | arg = MMC_SECURE_TRIM1_ARG; | |
303 | else | |
304 | arg = MMC_SECURE_ERASE_ARG; | |
305 | ||
306 | err = mmc_erase(card, from, nr, arg); | |
307 | if (!err && arg == MMC_SECURE_TRIM1_ARG) | |
308 | err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG); | |
309 | out: | |
310 | spin_lock_irq(&md->lock); | |
311 | __blk_end_request(req, err, blk_rq_bytes(req)); | |
312 | spin_unlock_irq(&md->lock); | |
313 | ||
314 | mmc_release_host(card->host); | |
315 | ||
316 | return err ? 0 : 1; | |
317 | } | |
318 | ||
bd788c96 | 319 | static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *req) |
1da177e4 LT |
320 | { |
321 | struct mmc_blk_data *md = mq->data; | |
322 | struct mmc_card *card = md->queue.card; | |
176f00ff | 323 | struct mmc_blk_request brq; |
6a79e391 | 324 | int ret = 1, disable_multi = 0; |
1da177e4 | 325 | |
b855885e | 326 | mmc_claim_host(card->host); |
1da177e4 LT |
327 | |
328 | do { | |
1da177e4 | 329 | struct mmc_command cmd; |
504f191f | 330 | u32 readcmd, writecmd, status = 0; |
1da177e4 LT |
331 | |
332 | memset(&brq, 0, sizeof(struct mmc_blk_request)); | |
333 | brq.mrq.cmd = &brq.cmd; | |
334 | brq.mrq.data = &brq.data; | |
335 | ||
83096ebf | 336 | brq.cmd.arg = blk_rq_pos(req); |
fba68bd2 PL |
337 | if (!mmc_card_blockaddr(card)) |
338 | brq.cmd.arg <<= 9; | |
7213d175 | 339 | brq.cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; |
08846698 | 340 | brq.data.blksz = 512; |
1da177e4 LT |
341 | brq.stop.opcode = MMC_STOP_TRANSMISSION; |
342 | brq.stop.arg = 0; | |
7213d175 | 343 | brq.stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC; |
83096ebf | 344 | brq.data.blocks = blk_rq_sectors(req); |
1da177e4 | 345 | |
548d2de9 PO |
346 | /* |
347 | * The block layer doesn't support all sector count | |
348 | * restrictions, so we need to be prepared for too big | |
349 | * requests. | |
350 | */ | |
351 | if (brq.data.blocks > card->host->max_blk_count) | |
352 | brq.data.blocks = card->host->max_blk_count; | |
353 | ||
6a79e391 AH |
354 | /* |
355 | * After a read error, we redo the request one sector at a time | |
356 | * in order to accurately determine which sectors can be read | |
357 | * successfully. | |
358 | */ | |
359 | if (disable_multi && brq.data.blocks > 1) | |
360 | brq.data.blocks = 1; | |
361 | ||
788ee7b0 | 362 | if (brq.data.blocks > 1) { |
7213d175 DB |
363 | /* SPI multiblock writes terminate using a special |
364 | * token, not a STOP_TRANSMISSION request. | |
365 | */ | |
366 | if (!mmc_host_is_spi(card->host) | |
367 | || rq_data_dir(req) == READ) | |
368 | brq.mrq.stop = &brq.stop; | |
db53f28b RK |
369 | readcmd = MMC_READ_MULTIPLE_BLOCK; |
370 | writecmd = MMC_WRITE_MULTIPLE_BLOCK; | |
788ee7b0 RK |
371 | } else { |
372 | brq.mrq.stop = NULL; | |
db53f28b RK |
373 | readcmd = MMC_READ_SINGLE_BLOCK; |
374 | writecmd = MMC_WRITE_BLOCK; | |
375 | } | |
376 | ||
377 | if (rq_data_dir(req) == READ) { | |
378 | brq.cmd.opcode = readcmd; | |
379 | brq.data.flags |= MMC_DATA_READ; | |
380 | } else { | |
381 | brq.cmd.opcode = writecmd; | |
382 | brq.data.flags |= MMC_DATA_WRITE; | |
788ee7b0 | 383 | } |
1da177e4 | 384 | |
b146d26a PO |
385 | mmc_set_data_timeout(&brq.data, card); |
386 | ||
1da177e4 | 387 | brq.data.sg = mq->sg; |
98ccf149 PO |
388 | brq.data.sg_len = mmc_queue_map_sg(mq); |
389 | ||
6a79e391 AH |
390 | /* |
391 | * Adjust the sg list so it is the same size as the | |
392 | * request. | |
393 | */ | |
83096ebf | 394 | if (brq.data.blocks != blk_rq_sectors(req)) { |
6a79e391 AH |
395 | int i, data_size = brq.data.blocks << 9; |
396 | struct scatterlist *sg; | |
397 | ||
398 | for_each_sg(brq.data.sg, sg, brq.data.sg_len, i) { | |
399 | data_size -= sg->length; | |
400 | if (data_size <= 0) { | |
401 | sg->length += data_size; | |
402 | i++; | |
403 | break; | |
404 | } | |
405 | } | |
406 | brq.data.sg_len = i; | |
407 | } | |
408 | ||
98ccf149 | 409 | mmc_queue_bounce_pre(mq); |
1da177e4 LT |
410 | |
411 | mmc_wait_for_req(card->host, &brq.mrq); | |
98ccf149 PO |
412 | |
413 | mmc_queue_bounce_post(mq); | |
414 | ||
979ce720 PO |
415 | /* |
416 | * Check for errors here, but don't jump to cmd_err | |
417 | * until later as we need to wait for the card to leave | |
418 | * programming mode even when things go wrong. | |
419 | */ | |
6a79e391 AH |
420 | if (brq.cmd.error || brq.data.error || brq.stop.error) { |
421 | if (brq.data.blocks > 1 && rq_data_dir(req) == READ) { | |
422 | /* Redo read one sector at a time */ | |
423 | printk(KERN_WARNING "%s: retrying using single " | |
424 | "block read\n", req->rq_disk->disk_name); | |
425 | disable_multi = 1; | |
426 | continue; | |
427 | } | |
504f191f | 428 | status = get_card_status(card, req); |
6a79e391 | 429 | } |
504f191f | 430 | |
1da177e4 | 431 | if (brq.cmd.error) { |
504f191f AH |
432 | printk(KERN_ERR "%s: error %d sending read/write " |
433 | "command, response %#x, card status %#x\n", | |
434 | req->rq_disk->disk_name, brq.cmd.error, | |
435 | brq.cmd.resp[0], status); | |
1da177e4 LT |
436 | } |
437 | ||
438 | if (brq.data.error) { | |
504f191f AH |
439 | if (brq.data.error == -ETIMEDOUT && brq.mrq.stop) |
440 | /* 'Stop' response contains card status */ | |
441 | status = brq.mrq.stop->resp[0]; | |
442 | printk(KERN_ERR "%s: error %d transferring data," | |
443 | " sector %u, nr %u, card status %#x\n", | |
444 | req->rq_disk->disk_name, brq.data.error, | |
83096ebf TH |
445 | (unsigned)blk_rq_pos(req), |
446 | (unsigned)blk_rq_sectors(req), status); | |
1da177e4 LT |
447 | } |
448 | ||
449 | if (brq.stop.error) { | |
504f191f AH |
450 | printk(KERN_ERR "%s: error %d sending stop command, " |
451 | "response %#x, card status %#x\n", | |
452 | req->rq_disk->disk_name, brq.stop.error, | |
453 | brq.stop.resp[0], status); | |
1da177e4 LT |
454 | } |
455 | ||
7213d175 | 456 | if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) { |
2ed6d22c RK |
457 | do { |
458 | int err; | |
459 | ||
460 | cmd.opcode = MMC_SEND_STATUS; | |
461 | cmd.arg = card->rca << 16; | |
462 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; | |
463 | err = mmc_wait_for_cmd(card->host, &cmd, 5); | |
464 | if (err) { | |
465 | printk(KERN_ERR "%s: error %d requesting status\n", | |
466 | req->rq_disk->disk_name, err); | |
467 | goto cmd_err; | |
468 | } | |
d198f101 PO |
469 | /* |
470 | * Some cards mishandle the status bits, | |
471 | * so make sure to check both the busy | |
472 | * indication and the card state. | |
473 | */ | |
474 | } while (!(cmd.resp[0] & R1_READY_FOR_DATA) || | |
475 | (R1_CURRENT_STATE(cmd.resp[0]) == 7)); | |
1da177e4 LT |
476 | |
477 | #if 0 | |
2ed6d22c RK |
478 | if (cmd.resp[0] & ~0x00000900) |
479 | printk(KERN_ERR "%s: status = %08x\n", | |
480 | req->rq_disk->disk_name, cmd.resp[0]); | |
481 | if (mmc_decode_status(cmd.resp)) | |
482 | goto cmd_err; | |
1da177e4 | 483 | #endif |
2ed6d22c | 484 | } |
1da177e4 | 485 | |
6a79e391 AH |
486 | if (brq.cmd.error || brq.stop.error || brq.data.error) { |
487 | if (rq_data_dir(req) == READ) { | |
488 | /* | |
489 | * After an error, we redo I/O one sector at a | |
490 | * time, so we only reach here after trying to | |
491 | * read a single sector. | |
492 | */ | |
493 | spin_lock_irq(&md->lock); | |
494 | ret = __blk_end_request(req, -EIO, brq.data.blksz); | |
495 | spin_unlock_irq(&md->lock); | |
496 | continue; | |
497 | } | |
979ce720 | 498 | goto cmd_err; |
6a79e391 | 499 | } |
979ce720 | 500 | |
1da177e4 LT |
501 | /* |
502 | * A block was successfully transferred. | |
503 | */ | |
504 | spin_lock_irq(&md->lock); | |
fd539832 | 505 | ret = __blk_end_request(req, 0, brq.data.bytes_xfered); |
1da177e4 LT |
506 | spin_unlock_irq(&md->lock); |
507 | } while (ret); | |
508 | ||
b855885e | 509 | mmc_release_host(card->host); |
1da177e4 LT |
510 | |
511 | return 1; | |
512 | ||
513 | cmd_err: | |
ec5a19dd PO |
514 | /* |
515 | * If this is an SD card and we're writing, we can first | |
516 | * mark the known good sectors as ok. | |
517 | * | |
518 | * If the card is not SD, we can still ok written sectors | |
23af6039 PO |
519 | * as reported by the controller (which might be less than |
520 | * the real number of written sectors, but never more). | |
1da177e4 | 521 | */ |
6a79e391 AH |
522 | if (mmc_card_sd(card)) { |
523 | u32 blocks; | |
23af6039 | 524 | |
6a79e391 AH |
525 | blocks = mmc_sd_num_wr_blocks(card); |
526 | if (blocks != (u32)-1) { | |
ec5a19dd | 527 | spin_lock_irq(&md->lock); |
6a79e391 | 528 | ret = __blk_end_request(req, 0, blocks << 9); |
ec5a19dd PO |
529 | spin_unlock_irq(&md->lock); |
530 | } | |
6a79e391 AH |
531 | } else { |
532 | spin_lock_irq(&md->lock); | |
533 | ret = __blk_end_request(req, 0, brq.data.bytes_xfered); | |
534 | spin_unlock_irq(&md->lock); | |
176f00ff PO |
535 | } |
536 | ||
b855885e | 537 | mmc_release_host(card->host); |
ec5a19dd | 538 | |
1da177e4 | 539 | spin_lock_irq(&md->lock); |
fd539832 KU |
540 | while (ret) |
541 | ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req)); | |
1da177e4 LT |
542 | spin_unlock_irq(&md->lock); |
543 | ||
544 | return 0; | |
545 | } | |
546 | ||
bd788c96 AH |
547 | static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) |
548 | { | |
49804548 AH |
549 | if (req->cmd_flags & REQ_DISCARD) { |
550 | if (req->cmd_flags & REQ_SECURE) | |
551 | return mmc_blk_issue_secdiscard_rq(mq, req); | |
552 | else | |
553 | return mmc_blk_issue_discard_rq(mq, req); | |
554 | } else { | |
bd788c96 | 555 | return mmc_blk_issue_rw_rq(mq, req); |
49804548 | 556 | } |
bd788c96 | 557 | } |
1da177e4 | 558 | |
a6f6c96b RK |
559 | static inline int mmc_blk_readonly(struct mmc_card *card) |
560 | { | |
561 | return mmc_card_readonly(card) || | |
562 | !(card->csd.cmdclass & CCC_BLOCK_WRITE); | |
563 | } | |
564 | ||
1da177e4 LT |
565 | static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card) |
566 | { | |
567 | struct mmc_blk_data *md; | |
568 | int devidx, ret; | |
569 | ||
570 | devidx = find_first_zero_bit(dev_use, MMC_NUM_MINORS); | |
571 | if (devidx >= MMC_NUM_MINORS) | |
572 | return ERR_PTR(-ENOSPC); | |
573 | __set_bit(devidx, dev_use); | |
574 | ||
dd00cc48 | 575 | md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL); |
a6f6c96b RK |
576 | if (!md) { |
577 | ret = -ENOMEM; | |
578 | goto out; | |
579 | } | |
1da177e4 | 580 | |
1da177e4 | 581 | |
a6f6c96b RK |
582 | /* |
583 | * Set the read-only status based on the supported commands | |
584 | * and the write protect switch. | |
585 | */ | |
586 | md->read_only = mmc_blk_readonly(card); | |
1da177e4 | 587 | |
a6f6c96b RK |
588 | md->disk = alloc_disk(1 << MMC_SHIFT); |
589 | if (md->disk == NULL) { | |
590 | ret = -ENOMEM; | |
591 | goto err_kfree; | |
592 | } | |
1da177e4 | 593 | |
a6f6c96b RK |
594 | spin_lock_init(&md->lock); |
595 | md->usage = 1; | |
1da177e4 | 596 | |
a6f6c96b RK |
597 | ret = mmc_init_queue(&md->queue, card, &md->lock); |
598 | if (ret) | |
599 | goto err_putdisk; | |
1da177e4 | 600 | |
a6f6c96b RK |
601 | md->queue.issue_fn = mmc_blk_issue_rq; |
602 | md->queue.data = md; | |
d2b18394 | 603 | |
fe6b4c88 | 604 | md->disk->major = MMC_BLOCK_MAJOR; |
a6f6c96b RK |
605 | md->disk->first_minor = devidx << MMC_SHIFT; |
606 | md->disk->fops = &mmc_bdops; | |
607 | md->disk->private_data = md; | |
608 | md->disk->queue = md->queue.queue; | |
609 | md->disk->driverfs_dev = &card->dev; | |
610 | ||
611 | /* | |
612 | * As discussed on lkml, GENHD_FL_REMOVABLE should: | |
613 | * | |
614 | * - be set for removable media with permanent block devices | |
615 | * - be unset for removable block devices with permanent media | |
616 | * | |
617 | * Since MMC block devices clearly fall under the second | |
618 | * case, we do not set GENHD_FL_REMOVABLE. Userspace | |
619 | * should use the block device creation/destruction hotplug | |
620 | * messages to tell when the card is present. | |
621 | */ | |
622 | ||
623 | sprintf(md->disk->disk_name, "mmcblk%d", devidx); | |
a6f6c96b | 624 | |
e1defc4f | 625 | blk_queue_logical_block_size(md->queue.queue, 512); |
a6f6c96b | 626 | |
85a18ad9 PO |
627 | if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) { |
628 | /* | |
629 | * The EXT_CSD sector count is in number or 512 byte | |
630 | * sectors. | |
631 | */ | |
632 | set_capacity(md->disk, card->ext_csd.sectors); | |
633 | } else { | |
634 | /* | |
635 | * The CSD capacity field is in units of read_blkbits. | |
636 | * set_capacity takes units of 512 bytes. | |
637 | */ | |
638 | set_capacity(md->disk, | |
639 | card->csd.capacity << (card->csd.read_blkbits - 9)); | |
640 | } | |
1da177e4 | 641 | return md; |
a6f6c96b RK |
642 | |
643 | err_putdisk: | |
644 | put_disk(md->disk); | |
645 | err_kfree: | |
646 | kfree(md); | |
647 | out: | |
648 | return ERR_PTR(ret); | |
1da177e4 LT |
649 | } |
650 | ||
651 | static int | |
652 | mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card) | |
653 | { | |
654 | struct mmc_command cmd; | |
655 | int err; | |
656 | ||
fba68bd2 PL |
657 | /* Block-addressed cards ignore MMC_SET_BLOCKLEN. */ |
658 | if (mmc_card_blockaddr(card)) | |
659 | return 0; | |
660 | ||
b855885e | 661 | mmc_claim_host(card->host); |
1da177e4 | 662 | cmd.opcode = MMC_SET_BLOCKLEN; |
08846698 | 663 | cmd.arg = 512; |
7213d175 | 664 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; |
1da177e4 | 665 | err = mmc_wait_for_cmd(card->host, &cmd, 5); |
b855885e | 666 | mmc_release_host(card->host); |
1da177e4 LT |
667 | |
668 | if (err) { | |
669 | printk(KERN_ERR "%s: unable to set block size to %d: %d\n", | |
670 | md->disk->disk_name, cmd.arg, err); | |
671 | return -EINVAL; | |
672 | } | |
673 | ||
674 | return 0; | |
675 | } | |
676 | ||
677 | static int mmc_blk_probe(struct mmc_card *card) | |
678 | { | |
679 | struct mmc_blk_data *md; | |
680 | int err; | |
681 | ||
a7bbb573 PO |
682 | char cap_str[10]; |
683 | ||
912490db PO |
684 | /* |
685 | * Check that the card supports the command class(es) we need. | |
686 | */ | |
687 | if (!(card->csd.cmdclass & CCC_BLOCK_READ)) | |
1da177e4 LT |
688 | return -ENODEV; |
689 | ||
1da177e4 LT |
690 | md = mmc_blk_alloc(card); |
691 | if (IS_ERR(md)) | |
692 | return PTR_ERR(md); | |
693 | ||
694 | err = mmc_blk_set_blksize(md, card); | |
695 | if (err) | |
696 | goto out; | |
697 | ||
444122fd | 698 | string_get_size((u64)get_capacity(md->disk) << 9, STRING_UNITS_2, |
a7bbb573 PO |
699 | cap_str, sizeof(cap_str)); |
700 | printk(KERN_INFO "%s: %s %s %s %s\n", | |
1da177e4 | 701 | md->disk->disk_name, mmc_card_id(card), mmc_card_name(card), |
a7bbb573 | 702 | cap_str, md->read_only ? "(ro)" : ""); |
1da177e4 LT |
703 | |
704 | mmc_set_drvdata(card, md); | |
705 | add_disk(md->disk); | |
706 | return 0; | |
707 | ||
708 | out: | |
0a74ff29 | 709 | mmc_cleanup_queue(&md->queue); |
1da177e4 LT |
710 | mmc_blk_put(md); |
711 | ||
712 | return err; | |
713 | } | |
714 | ||
715 | static void mmc_blk_remove(struct mmc_card *card) | |
716 | { | |
717 | struct mmc_blk_data *md = mmc_get_drvdata(card); | |
718 | ||
719 | if (md) { | |
89b4e133 | 720 | /* Stop new requests from getting into the queue */ |
1da177e4 LT |
721 | del_gendisk(md->disk); |
722 | ||
89b4e133 PO |
723 | /* Then flush out any already in there */ |
724 | mmc_cleanup_queue(&md->queue); | |
1da177e4 | 725 | |
1da177e4 LT |
726 | mmc_blk_put(md); |
727 | } | |
728 | mmc_set_drvdata(card, NULL); | |
729 | } | |
730 | ||
731 | #ifdef CONFIG_PM | |
732 | static int mmc_blk_suspend(struct mmc_card *card, pm_message_t state) | |
733 | { | |
734 | struct mmc_blk_data *md = mmc_get_drvdata(card); | |
735 | ||
736 | if (md) { | |
737 | mmc_queue_suspend(&md->queue); | |
738 | } | |
739 | return 0; | |
740 | } | |
741 | ||
742 | static int mmc_blk_resume(struct mmc_card *card) | |
743 | { | |
744 | struct mmc_blk_data *md = mmc_get_drvdata(card); | |
745 | ||
746 | if (md) { | |
747 | mmc_blk_set_blksize(md, card); | |
748 | mmc_queue_resume(&md->queue); | |
749 | } | |
750 | return 0; | |
751 | } | |
752 | #else | |
753 | #define mmc_blk_suspend NULL | |
754 | #define mmc_blk_resume NULL | |
755 | #endif | |
756 | ||
757 | static struct mmc_driver mmc_driver = { | |
758 | .drv = { | |
759 | .name = "mmcblk", | |
760 | }, | |
761 | .probe = mmc_blk_probe, | |
762 | .remove = mmc_blk_remove, | |
763 | .suspend = mmc_blk_suspend, | |
764 | .resume = mmc_blk_resume, | |
765 | }; | |
766 | ||
767 | static int __init mmc_blk_init(void) | |
768 | { | |
9d4e98e9 | 769 | int res; |
1da177e4 | 770 | |
fe6b4c88 PO |
771 | res = register_blkdev(MMC_BLOCK_MAJOR, "mmc"); |
772 | if (res) | |
1da177e4 | 773 | goto out; |
1da177e4 | 774 | |
9d4e98e9 AM |
775 | res = mmc_register_driver(&mmc_driver); |
776 | if (res) | |
777 | goto out2; | |
1da177e4 | 778 | |
9d4e98e9 AM |
779 | return 0; |
780 | out2: | |
781 | unregister_blkdev(MMC_BLOCK_MAJOR, "mmc"); | |
1da177e4 LT |
782 | out: |
783 | return res; | |
784 | } | |
785 | ||
786 | static void __exit mmc_blk_exit(void) | |
787 | { | |
788 | mmc_unregister_driver(&mmc_driver); | |
fe6b4c88 | 789 | unregister_blkdev(MMC_BLOCK_MAJOR, "mmc"); |
1da177e4 LT |
790 | } |
791 | ||
792 | module_init(mmc_blk_init); | |
793 | module_exit(mmc_blk_exit); | |
794 | ||
795 | MODULE_LICENSE("GPL"); | |
796 | MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver"); | |
797 |