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> |
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 | ||
1da177e4 LT |
250 | static int mmc_blk_issue_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; | |
176f00ff | 254 | struct mmc_blk_request brq; |
6a79e391 | 255 | int ret = 1, disable_multi = 0; |
1da177e4 | 256 | |
b855885e | 257 | mmc_claim_host(card->host); |
1da177e4 LT |
258 | |
259 | do { | |
1da177e4 | 260 | struct mmc_command cmd; |
504f191f | 261 | u32 readcmd, writecmd, status = 0; |
1da177e4 LT |
262 | |
263 | memset(&brq, 0, sizeof(struct mmc_blk_request)); | |
264 | brq.mrq.cmd = &brq.cmd; | |
265 | brq.mrq.data = &brq.data; | |
266 | ||
83096ebf | 267 | brq.cmd.arg = blk_rq_pos(req); |
fba68bd2 PL |
268 | if (!mmc_card_blockaddr(card)) |
269 | brq.cmd.arg <<= 9; | |
7213d175 | 270 | brq.cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; |
08846698 | 271 | brq.data.blksz = 512; |
1da177e4 LT |
272 | brq.stop.opcode = MMC_STOP_TRANSMISSION; |
273 | brq.stop.arg = 0; | |
7213d175 | 274 | brq.stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC; |
83096ebf | 275 | brq.data.blocks = blk_rq_sectors(req); |
1da177e4 | 276 | |
548d2de9 PO |
277 | /* |
278 | * The block layer doesn't support all sector count | |
279 | * restrictions, so we need to be prepared for too big | |
280 | * requests. | |
281 | */ | |
282 | if (brq.data.blocks > card->host->max_blk_count) | |
283 | brq.data.blocks = card->host->max_blk_count; | |
284 | ||
6a79e391 AH |
285 | /* |
286 | * After a read error, we redo the request one sector at a time | |
287 | * in order to accurately determine which sectors can be read | |
288 | * successfully. | |
289 | */ | |
290 | if (disable_multi && brq.data.blocks > 1) | |
291 | brq.data.blocks = 1; | |
292 | ||
788ee7b0 | 293 | if (brq.data.blocks > 1) { |
7213d175 DB |
294 | /* SPI multiblock writes terminate using a special |
295 | * token, not a STOP_TRANSMISSION request. | |
296 | */ | |
297 | if (!mmc_host_is_spi(card->host) | |
298 | || rq_data_dir(req) == READ) | |
299 | brq.mrq.stop = &brq.stop; | |
db53f28b RK |
300 | readcmd = MMC_READ_MULTIPLE_BLOCK; |
301 | writecmd = MMC_WRITE_MULTIPLE_BLOCK; | |
788ee7b0 RK |
302 | } else { |
303 | brq.mrq.stop = NULL; | |
db53f28b RK |
304 | readcmd = MMC_READ_SINGLE_BLOCK; |
305 | writecmd = MMC_WRITE_BLOCK; | |
306 | } | |
307 | ||
308 | if (rq_data_dir(req) == READ) { | |
309 | brq.cmd.opcode = readcmd; | |
310 | brq.data.flags |= MMC_DATA_READ; | |
311 | } else { | |
312 | brq.cmd.opcode = writecmd; | |
313 | brq.data.flags |= MMC_DATA_WRITE; | |
788ee7b0 | 314 | } |
1da177e4 | 315 | |
b146d26a PO |
316 | mmc_set_data_timeout(&brq.data, card); |
317 | ||
1da177e4 | 318 | brq.data.sg = mq->sg; |
98ccf149 PO |
319 | brq.data.sg_len = mmc_queue_map_sg(mq); |
320 | ||
6a79e391 AH |
321 | /* |
322 | * Adjust the sg list so it is the same size as the | |
323 | * request. | |
324 | */ | |
83096ebf | 325 | if (brq.data.blocks != blk_rq_sectors(req)) { |
6a79e391 AH |
326 | int i, data_size = brq.data.blocks << 9; |
327 | struct scatterlist *sg; | |
328 | ||
329 | for_each_sg(brq.data.sg, sg, brq.data.sg_len, i) { | |
330 | data_size -= sg->length; | |
331 | if (data_size <= 0) { | |
332 | sg->length += data_size; | |
333 | i++; | |
334 | break; | |
335 | } | |
336 | } | |
337 | brq.data.sg_len = i; | |
338 | } | |
339 | ||
98ccf149 | 340 | mmc_queue_bounce_pre(mq); |
1da177e4 LT |
341 | |
342 | mmc_wait_for_req(card->host, &brq.mrq); | |
98ccf149 PO |
343 | |
344 | mmc_queue_bounce_post(mq); | |
345 | ||
979ce720 PO |
346 | /* |
347 | * Check for errors here, but don't jump to cmd_err | |
348 | * until later as we need to wait for the card to leave | |
349 | * programming mode even when things go wrong. | |
350 | */ | |
6a79e391 AH |
351 | if (brq.cmd.error || brq.data.error || brq.stop.error) { |
352 | if (brq.data.blocks > 1 && rq_data_dir(req) == READ) { | |
353 | /* Redo read one sector at a time */ | |
354 | printk(KERN_WARNING "%s: retrying using single " | |
355 | "block read\n", req->rq_disk->disk_name); | |
356 | disable_multi = 1; | |
357 | continue; | |
358 | } | |
504f191f | 359 | status = get_card_status(card, req); |
6a79e391 | 360 | } |
504f191f | 361 | |
1da177e4 | 362 | if (brq.cmd.error) { |
504f191f AH |
363 | printk(KERN_ERR "%s: error %d sending read/write " |
364 | "command, response %#x, card status %#x\n", | |
365 | req->rq_disk->disk_name, brq.cmd.error, | |
366 | brq.cmd.resp[0], status); | |
1da177e4 LT |
367 | } |
368 | ||
369 | if (brq.data.error) { | |
504f191f AH |
370 | if (brq.data.error == -ETIMEDOUT && brq.mrq.stop) |
371 | /* 'Stop' response contains card status */ | |
372 | status = brq.mrq.stop->resp[0]; | |
373 | printk(KERN_ERR "%s: error %d transferring data," | |
374 | " sector %u, nr %u, card status %#x\n", | |
375 | req->rq_disk->disk_name, brq.data.error, | |
83096ebf TH |
376 | (unsigned)blk_rq_pos(req), |
377 | (unsigned)blk_rq_sectors(req), status); | |
1da177e4 LT |
378 | } |
379 | ||
380 | if (brq.stop.error) { | |
504f191f AH |
381 | printk(KERN_ERR "%s: error %d sending stop command, " |
382 | "response %#x, card status %#x\n", | |
383 | req->rq_disk->disk_name, brq.stop.error, | |
384 | brq.stop.resp[0], status); | |
1da177e4 LT |
385 | } |
386 | ||
7213d175 | 387 | if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) { |
2ed6d22c RK |
388 | do { |
389 | int err; | |
390 | ||
391 | cmd.opcode = MMC_SEND_STATUS; | |
392 | cmd.arg = card->rca << 16; | |
393 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; | |
394 | err = mmc_wait_for_cmd(card->host, &cmd, 5); | |
395 | if (err) { | |
396 | printk(KERN_ERR "%s: error %d requesting status\n", | |
397 | req->rq_disk->disk_name, err); | |
398 | goto cmd_err; | |
399 | } | |
d198f101 PO |
400 | /* |
401 | * Some cards mishandle the status bits, | |
402 | * so make sure to check both the busy | |
403 | * indication and the card state. | |
404 | */ | |
405 | } while (!(cmd.resp[0] & R1_READY_FOR_DATA) || | |
406 | (R1_CURRENT_STATE(cmd.resp[0]) == 7)); | |
1da177e4 LT |
407 | |
408 | #if 0 | |
2ed6d22c RK |
409 | if (cmd.resp[0] & ~0x00000900) |
410 | printk(KERN_ERR "%s: status = %08x\n", | |
411 | req->rq_disk->disk_name, cmd.resp[0]); | |
412 | if (mmc_decode_status(cmd.resp)) | |
413 | goto cmd_err; | |
1da177e4 | 414 | #endif |
2ed6d22c | 415 | } |
1da177e4 | 416 | |
6a79e391 AH |
417 | if (brq.cmd.error || brq.stop.error || brq.data.error) { |
418 | if (rq_data_dir(req) == READ) { | |
419 | /* | |
420 | * After an error, we redo I/O one sector at a | |
421 | * time, so we only reach here after trying to | |
422 | * read a single sector. | |
423 | */ | |
424 | spin_lock_irq(&md->lock); | |
425 | ret = __blk_end_request(req, -EIO, brq.data.blksz); | |
426 | spin_unlock_irq(&md->lock); | |
427 | continue; | |
428 | } | |
979ce720 | 429 | goto cmd_err; |
6a79e391 | 430 | } |
979ce720 | 431 | |
1da177e4 LT |
432 | /* |
433 | * A block was successfully transferred. | |
434 | */ | |
435 | spin_lock_irq(&md->lock); | |
fd539832 | 436 | ret = __blk_end_request(req, 0, brq.data.bytes_xfered); |
1da177e4 LT |
437 | spin_unlock_irq(&md->lock); |
438 | } while (ret); | |
439 | ||
b855885e | 440 | mmc_release_host(card->host); |
1da177e4 LT |
441 | |
442 | return 1; | |
443 | ||
444 | cmd_err: | |
ec5a19dd PO |
445 | /* |
446 | * If this is an SD card and we're writing, we can first | |
447 | * mark the known good sectors as ok. | |
448 | * | |
449 | * If the card is not SD, we can still ok written sectors | |
23af6039 PO |
450 | * as reported by the controller (which might be less than |
451 | * the real number of written sectors, but never more). | |
1da177e4 | 452 | */ |
6a79e391 AH |
453 | if (mmc_card_sd(card)) { |
454 | u32 blocks; | |
23af6039 | 455 | |
6a79e391 AH |
456 | blocks = mmc_sd_num_wr_blocks(card); |
457 | if (blocks != (u32)-1) { | |
ec5a19dd | 458 | spin_lock_irq(&md->lock); |
6a79e391 | 459 | ret = __blk_end_request(req, 0, blocks << 9); |
ec5a19dd PO |
460 | spin_unlock_irq(&md->lock); |
461 | } | |
6a79e391 AH |
462 | } else { |
463 | spin_lock_irq(&md->lock); | |
464 | ret = __blk_end_request(req, 0, brq.data.bytes_xfered); | |
465 | spin_unlock_irq(&md->lock); | |
176f00ff PO |
466 | } |
467 | ||
b855885e | 468 | mmc_release_host(card->host); |
ec5a19dd | 469 | |
1da177e4 | 470 | spin_lock_irq(&md->lock); |
fd539832 KU |
471 | while (ret) |
472 | ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req)); | |
1da177e4 LT |
473 | spin_unlock_irq(&md->lock); |
474 | ||
475 | return 0; | |
476 | } | |
477 | ||
1da177e4 | 478 | |
a6f6c96b RK |
479 | static inline int mmc_blk_readonly(struct mmc_card *card) |
480 | { | |
481 | return mmc_card_readonly(card) || | |
482 | !(card->csd.cmdclass & CCC_BLOCK_WRITE); | |
483 | } | |
484 | ||
1da177e4 LT |
485 | static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card) |
486 | { | |
487 | struct mmc_blk_data *md; | |
488 | int devidx, ret; | |
489 | ||
490 | devidx = find_first_zero_bit(dev_use, MMC_NUM_MINORS); | |
491 | if (devidx >= MMC_NUM_MINORS) | |
492 | return ERR_PTR(-ENOSPC); | |
493 | __set_bit(devidx, dev_use); | |
494 | ||
dd00cc48 | 495 | md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL); |
a6f6c96b RK |
496 | if (!md) { |
497 | ret = -ENOMEM; | |
498 | goto out; | |
499 | } | |
1da177e4 | 500 | |
1da177e4 | 501 | |
a6f6c96b RK |
502 | /* |
503 | * Set the read-only status based on the supported commands | |
504 | * and the write protect switch. | |
505 | */ | |
506 | md->read_only = mmc_blk_readonly(card); | |
1da177e4 | 507 | |
a6f6c96b RK |
508 | md->disk = alloc_disk(1 << MMC_SHIFT); |
509 | if (md->disk == NULL) { | |
510 | ret = -ENOMEM; | |
511 | goto err_kfree; | |
512 | } | |
1da177e4 | 513 | |
a6f6c96b RK |
514 | spin_lock_init(&md->lock); |
515 | md->usage = 1; | |
1da177e4 | 516 | |
a6f6c96b RK |
517 | ret = mmc_init_queue(&md->queue, card, &md->lock); |
518 | if (ret) | |
519 | goto err_putdisk; | |
1da177e4 | 520 | |
a6f6c96b RK |
521 | md->queue.issue_fn = mmc_blk_issue_rq; |
522 | md->queue.data = md; | |
d2b18394 | 523 | |
fe6b4c88 | 524 | md->disk->major = MMC_BLOCK_MAJOR; |
a6f6c96b RK |
525 | md->disk->first_minor = devidx << MMC_SHIFT; |
526 | md->disk->fops = &mmc_bdops; | |
527 | md->disk->private_data = md; | |
528 | md->disk->queue = md->queue.queue; | |
529 | md->disk->driverfs_dev = &card->dev; | |
530 | ||
531 | /* | |
532 | * As discussed on lkml, GENHD_FL_REMOVABLE should: | |
533 | * | |
534 | * - be set for removable media with permanent block devices | |
535 | * - be unset for removable block devices with permanent media | |
536 | * | |
537 | * Since MMC block devices clearly fall under the second | |
538 | * case, we do not set GENHD_FL_REMOVABLE. Userspace | |
539 | * should use the block device creation/destruction hotplug | |
540 | * messages to tell when the card is present. | |
541 | */ | |
542 | ||
543 | sprintf(md->disk->disk_name, "mmcblk%d", devidx); | |
a6f6c96b | 544 | |
e1defc4f | 545 | blk_queue_logical_block_size(md->queue.queue, 512); |
a6f6c96b | 546 | |
85a18ad9 PO |
547 | if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) { |
548 | /* | |
549 | * The EXT_CSD sector count is in number or 512 byte | |
550 | * sectors. | |
551 | */ | |
552 | set_capacity(md->disk, card->ext_csd.sectors); | |
553 | } else { | |
554 | /* | |
555 | * The CSD capacity field is in units of read_blkbits. | |
556 | * set_capacity takes units of 512 bytes. | |
557 | */ | |
558 | set_capacity(md->disk, | |
559 | card->csd.capacity << (card->csd.read_blkbits - 9)); | |
560 | } | |
1da177e4 | 561 | return md; |
a6f6c96b RK |
562 | |
563 | err_putdisk: | |
564 | put_disk(md->disk); | |
565 | err_kfree: | |
566 | kfree(md); | |
567 | out: | |
568 | return ERR_PTR(ret); | |
1da177e4 LT |
569 | } |
570 | ||
571 | static int | |
572 | mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card) | |
573 | { | |
574 | struct mmc_command cmd; | |
575 | int err; | |
576 | ||
fba68bd2 PL |
577 | /* Block-addressed cards ignore MMC_SET_BLOCKLEN. */ |
578 | if (mmc_card_blockaddr(card)) | |
579 | return 0; | |
580 | ||
b855885e | 581 | mmc_claim_host(card->host); |
1da177e4 | 582 | cmd.opcode = MMC_SET_BLOCKLEN; |
08846698 | 583 | cmd.arg = 512; |
7213d175 | 584 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; |
1da177e4 | 585 | err = mmc_wait_for_cmd(card->host, &cmd, 5); |
b855885e | 586 | mmc_release_host(card->host); |
1da177e4 LT |
587 | |
588 | if (err) { | |
589 | printk(KERN_ERR "%s: unable to set block size to %d: %d\n", | |
590 | md->disk->disk_name, cmd.arg, err); | |
591 | return -EINVAL; | |
592 | } | |
593 | ||
594 | return 0; | |
595 | } | |
596 | ||
597 | static int mmc_blk_probe(struct mmc_card *card) | |
598 | { | |
599 | struct mmc_blk_data *md; | |
600 | int err; | |
601 | ||
a7bbb573 PO |
602 | char cap_str[10]; |
603 | ||
912490db PO |
604 | /* |
605 | * Check that the card supports the command class(es) we need. | |
606 | */ | |
607 | if (!(card->csd.cmdclass & CCC_BLOCK_READ)) | |
1da177e4 LT |
608 | return -ENODEV; |
609 | ||
1da177e4 LT |
610 | md = mmc_blk_alloc(card); |
611 | if (IS_ERR(md)) | |
612 | return PTR_ERR(md); | |
613 | ||
614 | err = mmc_blk_set_blksize(md, card); | |
615 | if (err) | |
616 | goto out; | |
617 | ||
444122fd | 618 | string_get_size((u64)get_capacity(md->disk) << 9, STRING_UNITS_2, |
a7bbb573 PO |
619 | cap_str, sizeof(cap_str)); |
620 | printk(KERN_INFO "%s: %s %s %s %s\n", | |
1da177e4 | 621 | md->disk->disk_name, mmc_card_id(card), mmc_card_name(card), |
a7bbb573 | 622 | cap_str, md->read_only ? "(ro)" : ""); |
1da177e4 LT |
623 | |
624 | mmc_set_drvdata(card, md); | |
625 | add_disk(md->disk); | |
626 | return 0; | |
627 | ||
628 | out: | |
0a74ff29 | 629 | mmc_cleanup_queue(&md->queue); |
1da177e4 LT |
630 | mmc_blk_put(md); |
631 | ||
632 | return err; | |
633 | } | |
634 | ||
635 | static void mmc_blk_remove(struct mmc_card *card) | |
636 | { | |
637 | struct mmc_blk_data *md = mmc_get_drvdata(card); | |
638 | ||
639 | if (md) { | |
89b4e133 | 640 | /* Stop new requests from getting into the queue */ |
1da177e4 LT |
641 | del_gendisk(md->disk); |
642 | ||
89b4e133 PO |
643 | /* Then flush out any already in there */ |
644 | mmc_cleanup_queue(&md->queue); | |
1da177e4 | 645 | |
1da177e4 LT |
646 | mmc_blk_put(md); |
647 | } | |
648 | mmc_set_drvdata(card, NULL); | |
649 | } | |
650 | ||
651 | #ifdef CONFIG_PM | |
652 | static int mmc_blk_suspend(struct mmc_card *card, pm_message_t state) | |
653 | { | |
654 | struct mmc_blk_data *md = mmc_get_drvdata(card); | |
655 | ||
656 | if (md) { | |
657 | mmc_queue_suspend(&md->queue); | |
658 | } | |
659 | return 0; | |
660 | } | |
661 | ||
662 | static int mmc_blk_resume(struct mmc_card *card) | |
663 | { | |
664 | struct mmc_blk_data *md = mmc_get_drvdata(card); | |
665 | ||
666 | if (md) { | |
667 | mmc_blk_set_blksize(md, card); | |
668 | mmc_queue_resume(&md->queue); | |
669 | } | |
670 | return 0; | |
671 | } | |
672 | #else | |
673 | #define mmc_blk_suspend NULL | |
674 | #define mmc_blk_resume NULL | |
675 | #endif | |
676 | ||
677 | static struct mmc_driver mmc_driver = { | |
678 | .drv = { | |
679 | .name = "mmcblk", | |
680 | }, | |
681 | .probe = mmc_blk_probe, | |
682 | .remove = mmc_blk_remove, | |
683 | .suspend = mmc_blk_suspend, | |
684 | .resume = mmc_blk_resume, | |
685 | }; | |
686 | ||
687 | static int __init mmc_blk_init(void) | |
688 | { | |
9d4e98e9 | 689 | int res; |
1da177e4 | 690 | |
fe6b4c88 PO |
691 | res = register_blkdev(MMC_BLOCK_MAJOR, "mmc"); |
692 | if (res) | |
1da177e4 | 693 | goto out; |
1da177e4 | 694 | |
9d4e98e9 AM |
695 | res = mmc_register_driver(&mmc_driver); |
696 | if (res) | |
697 | goto out2; | |
1da177e4 | 698 | |
9d4e98e9 AM |
699 | return 0; |
700 | out2: | |
701 | unregister_blkdev(MMC_BLOCK_MAJOR, "mmc"); | |
1da177e4 LT |
702 | out: |
703 | return res; | |
704 | } | |
705 | ||
706 | static void __exit mmc_blk_exit(void) | |
707 | { | |
708 | mmc_unregister_driver(&mmc_driver); | |
fe6b4c88 | 709 | unregister_blkdev(MMC_BLOCK_MAJOR, "mmc"); |
1da177e4 LT |
710 | } |
711 | ||
712 | module_init(mmc_blk_init); | |
713 | module_exit(mmc_blk_exit); | |
714 | ||
715 | MODULE_LICENSE("GPL"); | |
716 | MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver"); | |
717 |