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