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> | |
26 | #include <linux/errno.h> | |
27 | #include <linux/hdreg.h> | |
28 | #include <linux/kdev_t.h> | |
29 | #include <linux/blkdev.h> | |
a621aaed | 30 | #include <linux/mutex.h> |
ec5a19dd | 31 | #include <linux/scatterlist.h> |
a7bbb573 | 32 | #include <linux/string_helpers.h> |
1da177e4 LT |
33 | |
34 | #include <linux/mmc/card.h> | |
385e3227 | 35 | #include <linux/mmc/host.h> |
da7fbe58 PO |
36 | #include <linux/mmc/mmc.h> |
37 | #include <linux/mmc/sd.h> | |
1da177e4 LT |
38 | |
39 | #include <asm/system.h> | |
40 | #include <asm/uaccess.h> | |
41 | ||
98ac2162 | 42 | #include "queue.h" |
1da177e4 LT |
43 | |
44 | /* | |
45 | * max 8 partitions per card | |
46 | */ | |
47 | #define MMC_SHIFT 3 | |
1dff3144 DW |
48 | #define MMC_NUM_MINORS (256 >> MMC_SHIFT) |
49 | ||
203c8018 | 50 | static DECLARE_BITMAP(dev_use, MMC_NUM_MINORS); |
1da177e4 | 51 | |
1da177e4 LT |
52 | /* |
53 | * There is one mmc_blk_data per slot. | |
54 | */ | |
55 | struct mmc_blk_data { | |
56 | spinlock_t lock; | |
57 | struct gendisk *disk; | |
58 | struct mmc_queue queue; | |
59 | ||
60 | unsigned int usage; | |
a6f6c96b | 61 | unsigned int read_only; |
1da177e4 LT |
62 | }; |
63 | ||
a621aaed | 64 | static DEFINE_MUTEX(open_lock); |
1da177e4 LT |
65 | |
66 | static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk) | |
67 | { | |
68 | struct mmc_blk_data *md; | |
69 | ||
a621aaed | 70 | mutex_lock(&open_lock); |
1da177e4 LT |
71 | md = disk->private_data; |
72 | if (md && md->usage == 0) | |
73 | md = NULL; | |
74 | if (md) | |
75 | md->usage++; | |
a621aaed | 76 | mutex_unlock(&open_lock); |
1da177e4 LT |
77 | |
78 | return md; | |
79 | } | |
80 | ||
81 | static void mmc_blk_put(struct mmc_blk_data *md) | |
82 | { | |
a621aaed | 83 | mutex_lock(&open_lock); |
1da177e4 LT |
84 | md->usage--; |
85 | if (md->usage == 0) { | |
f331c029 | 86 | int devidx = MINOR(disk_devt(md->disk)) >> MMC_SHIFT; |
1dff3144 DW |
87 | __clear_bit(devidx, dev_use); |
88 | ||
1da177e4 | 89 | put_disk(md->disk); |
1da177e4 LT |
90 | kfree(md); |
91 | } | |
a621aaed | 92 | mutex_unlock(&open_lock); |
1da177e4 LT |
93 | } |
94 | ||
a5a1561f | 95 | static int mmc_blk_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 96 | { |
a5a1561f | 97 | struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk); |
1da177e4 LT |
98 | int ret = -ENXIO; |
99 | ||
1da177e4 LT |
100 | if (md) { |
101 | if (md->usage == 2) | |
a5a1561f | 102 | check_disk_change(bdev); |
1da177e4 | 103 | ret = 0; |
a00fc090 | 104 | |
a5a1561f | 105 | if ((mode & FMODE_WRITE) && md->read_only) { |
70bb0896 | 106 | mmc_blk_put(md); |
a00fc090 | 107 | ret = -EROFS; |
70bb0896 | 108 | } |
1da177e4 LT |
109 | } |
110 | ||
111 | return ret; | |
112 | } | |
113 | ||
a5a1561f | 114 | static int mmc_blk_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 115 | { |
a5a1561f | 116 | struct mmc_blk_data *md = disk->private_data; |
1da177e4 LT |
117 | |
118 | mmc_blk_put(md); | |
119 | return 0; | |
120 | } | |
121 | ||
122 | static int | |
a885c8c4 | 123 | mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
1da177e4 | 124 | { |
a885c8c4 CH |
125 | geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16); |
126 | geo->heads = 4; | |
127 | geo->sectors = 16; | |
128 | return 0; | |
1da177e4 LT |
129 | } |
130 | ||
131 | static struct block_device_operations mmc_bdops = { | |
a5a1561f AV |
132 | .open = mmc_blk_open, |
133 | .release = mmc_blk_release, | |
a885c8c4 | 134 | .getgeo = mmc_blk_getgeo, |
1da177e4 LT |
135 | .owner = THIS_MODULE, |
136 | }; | |
137 | ||
138 | struct mmc_blk_request { | |
139 | struct mmc_request mrq; | |
140 | struct mmc_command cmd; | |
141 | struct mmc_command stop; | |
142 | struct mmc_data data; | |
143 | }; | |
144 | ||
ec5a19dd PO |
145 | static u32 mmc_sd_num_wr_blocks(struct mmc_card *card) |
146 | { | |
147 | int err; | |
b7a03210 | 148 | __be32 blocks; |
ec5a19dd PO |
149 | |
150 | struct mmc_request mrq; | |
151 | struct mmc_command cmd; | |
152 | struct mmc_data data; | |
153 | unsigned int timeout_us; | |
154 | ||
155 | struct scatterlist sg; | |
156 | ||
157 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
158 | ||
159 | cmd.opcode = MMC_APP_CMD; | |
160 | cmd.arg = card->rca << 16; | |
7213d175 | 161 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; |
ec5a19dd PO |
162 | |
163 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
7213d175 DB |
164 | if (err) |
165 | return (u32)-1; | |
166 | if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD)) | |
ec5a19dd PO |
167 | return (u32)-1; |
168 | ||
169 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
170 | ||
171 | cmd.opcode = SD_APP_SEND_NUM_WR_BLKS; | |
172 | cmd.arg = 0; | |
7213d175 | 173 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; |
ec5a19dd PO |
174 | |
175 | memset(&data, 0, sizeof(struct mmc_data)); | |
176 | ||
177 | data.timeout_ns = card->csd.tacc_ns * 100; | |
178 | data.timeout_clks = card->csd.tacc_clks * 100; | |
179 | ||
180 | timeout_us = data.timeout_ns / 1000; | |
181 | timeout_us += data.timeout_clks * 1000 / | |
182 | (card->host->ios.clock / 1000); | |
183 | ||
184 | if (timeout_us > 100000) { | |
185 | data.timeout_ns = 100000000; | |
186 | data.timeout_clks = 0; | |
187 | } | |
188 | ||
189 | data.blksz = 4; | |
190 | data.blocks = 1; | |
191 | data.flags = MMC_DATA_READ; | |
192 | data.sg = &sg; | |
193 | data.sg_len = 1; | |
194 | ||
195 | memset(&mrq, 0, sizeof(struct mmc_request)); | |
196 | ||
197 | mrq.cmd = &cmd; | |
198 | mrq.data = &data; | |
199 | ||
200 | sg_init_one(&sg, &blocks, 4); | |
201 | ||
202 | mmc_wait_for_req(card->host, &mrq); | |
203 | ||
17b0429d | 204 | if (cmd.error || data.error) |
ec5a19dd PO |
205 | return (u32)-1; |
206 | ||
b7a03210 | 207 | return ntohl(blocks); |
ec5a19dd PO |
208 | } |
209 | ||
504f191f AH |
210 | static u32 get_card_status(struct mmc_card *card, struct request *req) |
211 | { | |
212 | struct mmc_command cmd; | |
213 | int err; | |
214 | ||
215 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
216 | cmd.opcode = MMC_SEND_STATUS; | |
217 | if (!mmc_host_is_spi(card->host)) | |
218 | cmd.arg = card->rca << 16; | |
219 | cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC; | |
220 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
221 | if (err) | |
222 | printk(KERN_ERR "%s: error %d sending status comand", | |
223 | req->rq_disk->disk_name, err); | |
224 | return cmd.resp[0]; | |
225 | } | |
226 | ||
1da177e4 LT |
227 | static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) |
228 | { | |
229 | struct mmc_blk_data *md = mq->data; | |
230 | struct mmc_card *card = md->queue.card; | |
176f00ff | 231 | struct mmc_blk_request brq; |
6a79e391 | 232 | int ret = 1, disable_multi = 0; |
1da177e4 | 233 | |
b855885e | 234 | mmc_claim_host(card->host); |
1da177e4 LT |
235 | |
236 | do { | |
1da177e4 | 237 | struct mmc_command cmd; |
504f191f | 238 | u32 readcmd, writecmd, status = 0; |
1da177e4 LT |
239 | |
240 | memset(&brq, 0, sizeof(struct mmc_blk_request)); | |
241 | brq.mrq.cmd = &brq.cmd; | |
242 | brq.mrq.data = &brq.data; | |
243 | ||
fba68bd2 PL |
244 | brq.cmd.arg = req->sector; |
245 | if (!mmc_card_blockaddr(card)) | |
246 | brq.cmd.arg <<= 9; | |
7213d175 | 247 | brq.cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; |
08846698 | 248 | brq.data.blksz = 512; |
1da177e4 LT |
249 | brq.stop.opcode = MMC_STOP_TRANSMISSION; |
250 | brq.stop.arg = 0; | |
7213d175 | 251 | brq.stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC; |
08846698 | 252 | brq.data.blocks = req->nr_sectors; |
1da177e4 | 253 | |
6a79e391 AH |
254 | /* |
255 | * After a read error, we redo the request one sector at a time | |
256 | * in order to accurately determine which sectors can be read | |
257 | * successfully. | |
258 | */ | |
259 | if (disable_multi && brq.data.blocks > 1) | |
260 | brq.data.blocks = 1; | |
261 | ||
788ee7b0 | 262 | if (brq.data.blocks > 1) { |
7213d175 DB |
263 | /* SPI multiblock writes terminate using a special |
264 | * token, not a STOP_TRANSMISSION request. | |
265 | */ | |
266 | if (!mmc_host_is_spi(card->host) | |
267 | || rq_data_dir(req) == READ) | |
268 | brq.mrq.stop = &brq.stop; | |
db53f28b RK |
269 | readcmd = MMC_READ_MULTIPLE_BLOCK; |
270 | writecmd = MMC_WRITE_MULTIPLE_BLOCK; | |
788ee7b0 RK |
271 | } else { |
272 | brq.mrq.stop = NULL; | |
db53f28b RK |
273 | readcmd = MMC_READ_SINGLE_BLOCK; |
274 | writecmd = MMC_WRITE_BLOCK; | |
275 | } | |
276 | ||
277 | if (rq_data_dir(req) == READ) { | |
278 | brq.cmd.opcode = readcmd; | |
279 | brq.data.flags |= MMC_DATA_READ; | |
280 | } else { | |
281 | brq.cmd.opcode = writecmd; | |
282 | brq.data.flags |= MMC_DATA_WRITE; | |
788ee7b0 | 283 | } |
1da177e4 | 284 | |
b146d26a PO |
285 | mmc_set_data_timeout(&brq.data, card); |
286 | ||
1da177e4 | 287 | brq.data.sg = mq->sg; |
98ccf149 PO |
288 | brq.data.sg_len = mmc_queue_map_sg(mq); |
289 | ||
6a79e391 AH |
290 | /* |
291 | * Adjust the sg list so it is the same size as the | |
292 | * request. | |
293 | */ | |
294 | if (brq.data.blocks != req->nr_sectors) { | |
295 | int i, data_size = brq.data.blocks << 9; | |
296 | struct scatterlist *sg; | |
297 | ||
298 | for_each_sg(brq.data.sg, sg, brq.data.sg_len, i) { | |
299 | data_size -= sg->length; | |
300 | if (data_size <= 0) { | |
301 | sg->length += data_size; | |
302 | i++; | |
303 | break; | |
304 | } | |
305 | } | |
306 | brq.data.sg_len = i; | |
307 | } | |
308 | ||
98ccf149 | 309 | mmc_queue_bounce_pre(mq); |
1da177e4 LT |
310 | |
311 | mmc_wait_for_req(card->host, &brq.mrq); | |
98ccf149 PO |
312 | |
313 | mmc_queue_bounce_post(mq); | |
314 | ||
979ce720 PO |
315 | /* |
316 | * Check for errors here, but don't jump to cmd_err | |
317 | * until later as we need to wait for the card to leave | |
318 | * programming mode even when things go wrong. | |
319 | */ | |
6a79e391 AH |
320 | if (brq.cmd.error || brq.data.error || brq.stop.error) { |
321 | if (brq.data.blocks > 1 && rq_data_dir(req) == READ) { | |
322 | /* Redo read one sector at a time */ | |
323 | printk(KERN_WARNING "%s: retrying using single " | |
324 | "block read\n", req->rq_disk->disk_name); | |
325 | disable_multi = 1; | |
326 | continue; | |
327 | } | |
504f191f | 328 | status = get_card_status(card, req); |
6a79e391 | 329 | } |
504f191f | 330 | |
1da177e4 | 331 | if (brq.cmd.error) { |
504f191f AH |
332 | printk(KERN_ERR "%s: error %d sending read/write " |
333 | "command, response %#x, card status %#x\n", | |
334 | req->rq_disk->disk_name, brq.cmd.error, | |
335 | brq.cmd.resp[0], status); | |
1da177e4 LT |
336 | } |
337 | ||
338 | if (brq.data.error) { | |
504f191f AH |
339 | if (brq.data.error == -ETIMEDOUT && brq.mrq.stop) |
340 | /* 'Stop' response contains card status */ | |
341 | status = brq.mrq.stop->resp[0]; | |
342 | printk(KERN_ERR "%s: error %d transferring data," | |
343 | " sector %u, nr %u, card status %#x\n", | |
344 | req->rq_disk->disk_name, brq.data.error, | |
345 | (unsigned)req->sector, | |
346 | (unsigned)req->nr_sectors, status); | |
1da177e4 LT |
347 | } |
348 | ||
349 | if (brq.stop.error) { | |
504f191f AH |
350 | printk(KERN_ERR "%s: error %d sending stop command, " |
351 | "response %#x, card status %#x\n", | |
352 | req->rq_disk->disk_name, brq.stop.error, | |
353 | brq.stop.resp[0], status); | |
1da177e4 LT |
354 | } |
355 | ||
7213d175 | 356 | if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) { |
2ed6d22c RK |
357 | do { |
358 | int err; | |
359 | ||
360 | cmd.opcode = MMC_SEND_STATUS; | |
361 | cmd.arg = card->rca << 16; | |
362 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; | |
363 | err = mmc_wait_for_cmd(card->host, &cmd, 5); | |
364 | if (err) { | |
365 | printk(KERN_ERR "%s: error %d requesting status\n", | |
366 | req->rq_disk->disk_name, err); | |
367 | goto cmd_err; | |
368 | } | |
d198f101 PO |
369 | /* |
370 | * Some cards mishandle the status bits, | |
371 | * so make sure to check both the busy | |
372 | * indication and the card state. | |
373 | */ | |
374 | } while (!(cmd.resp[0] & R1_READY_FOR_DATA) || | |
375 | (R1_CURRENT_STATE(cmd.resp[0]) == 7)); | |
1da177e4 LT |
376 | |
377 | #if 0 | |
2ed6d22c RK |
378 | if (cmd.resp[0] & ~0x00000900) |
379 | printk(KERN_ERR "%s: status = %08x\n", | |
380 | req->rq_disk->disk_name, cmd.resp[0]); | |
381 | if (mmc_decode_status(cmd.resp)) | |
382 | goto cmd_err; | |
1da177e4 | 383 | #endif |
2ed6d22c | 384 | } |
1da177e4 | 385 | |
6a79e391 AH |
386 | if (brq.cmd.error || brq.stop.error || brq.data.error) { |
387 | if (rq_data_dir(req) == READ) { | |
388 | /* | |
389 | * After an error, we redo I/O one sector at a | |
390 | * time, so we only reach here after trying to | |
391 | * read a single sector. | |
392 | */ | |
393 | spin_lock_irq(&md->lock); | |
394 | ret = __blk_end_request(req, -EIO, brq.data.blksz); | |
395 | spin_unlock_irq(&md->lock); | |
396 | continue; | |
397 | } | |
979ce720 | 398 | goto cmd_err; |
6a79e391 | 399 | } |
979ce720 | 400 | |
1da177e4 LT |
401 | /* |
402 | * A block was successfully transferred. | |
403 | */ | |
404 | spin_lock_irq(&md->lock); | |
fd539832 | 405 | ret = __blk_end_request(req, 0, brq.data.bytes_xfered); |
1da177e4 LT |
406 | spin_unlock_irq(&md->lock); |
407 | } while (ret); | |
408 | ||
b855885e | 409 | mmc_release_host(card->host); |
1da177e4 LT |
410 | |
411 | return 1; | |
412 | ||
413 | cmd_err: | |
ec5a19dd PO |
414 | /* |
415 | * If this is an SD card and we're writing, we can first | |
416 | * mark the known good sectors as ok. | |
417 | * | |
418 | * If the card is not SD, we can still ok written sectors | |
23af6039 PO |
419 | * as reported by the controller (which might be less than |
420 | * the real number of written sectors, but never more). | |
1da177e4 | 421 | */ |
6a79e391 AH |
422 | if (mmc_card_sd(card)) { |
423 | u32 blocks; | |
23af6039 | 424 | |
6a79e391 AH |
425 | blocks = mmc_sd_num_wr_blocks(card); |
426 | if (blocks != (u32)-1) { | |
ec5a19dd | 427 | spin_lock_irq(&md->lock); |
6a79e391 | 428 | ret = __blk_end_request(req, 0, blocks << 9); |
ec5a19dd PO |
429 | spin_unlock_irq(&md->lock); |
430 | } | |
6a79e391 AH |
431 | } else { |
432 | spin_lock_irq(&md->lock); | |
433 | ret = __blk_end_request(req, 0, brq.data.bytes_xfered); | |
434 | spin_unlock_irq(&md->lock); | |
176f00ff PO |
435 | } |
436 | ||
b855885e | 437 | mmc_release_host(card->host); |
ec5a19dd | 438 | |
1da177e4 | 439 | spin_lock_irq(&md->lock); |
fd539832 KU |
440 | while (ret) |
441 | ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req)); | |
1da177e4 LT |
442 | spin_unlock_irq(&md->lock); |
443 | ||
444 | return 0; | |
445 | } | |
446 | ||
1da177e4 | 447 | |
a6f6c96b RK |
448 | static inline int mmc_blk_readonly(struct mmc_card *card) |
449 | { | |
450 | return mmc_card_readonly(card) || | |
451 | !(card->csd.cmdclass & CCC_BLOCK_WRITE); | |
452 | } | |
453 | ||
1da177e4 LT |
454 | static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card) |
455 | { | |
456 | struct mmc_blk_data *md; | |
457 | int devidx, ret; | |
458 | ||
459 | devidx = find_first_zero_bit(dev_use, MMC_NUM_MINORS); | |
460 | if (devidx >= MMC_NUM_MINORS) | |
461 | return ERR_PTR(-ENOSPC); | |
462 | __set_bit(devidx, dev_use); | |
463 | ||
dd00cc48 | 464 | md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL); |
a6f6c96b RK |
465 | if (!md) { |
466 | ret = -ENOMEM; | |
467 | goto out; | |
468 | } | |
1da177e4 | 469 | |
1da177e4 | 470 | |
a6f6c96b RK |
471 | /* |
472 | * Set the read-only status based on the supported commands | |
473 | * and the write protect switch. | |
474 | */ | |
475 | md->read_only = mmc_blk_readonly(card); | |
1da177e4 | 476 | |
a6f6c96b RK |
477 | md->disk = alloc_disk(1 << MMC_SHIFT); |
478 | if (md->disk == NULL) { | |
479 | ret = -ENOMEM; | |
480 | goto err_kfree; | |
481 | } | |
1da177e4 | 482 | |
a6f6c96b RK |
483 | spin_lock_init(&md->lock); |
484 | md->usage = 1; | |
1da177e4 | 485 | |
a6f6c96b RK |
486 | ret = mmc_init_queue(&md->queue, card, &md->lock); |
487 | if (ret) | |
488 | goto err_putdisk; | |
1da177e4 | 489 | |
a6f6c96b RK |
490 | md->queue.issue_fn = mmc_blk_issue_rq; |
491 | md->queue.data = md; | |
d2b18394 | 492 | |
fe6b4c88 | 493 | md->disk->major = MMC_BLOCK_MAJOR; |
a6f6c96b RK |
494 | md->disk->first_minor = devidx << MMC_SHIFT; |
495 | md->disk->fops = &mmc_bdops; | |
496 | md->disk->private_data = md; | |
497 | md->disk->queue = md->queue.queue; | |
498 | md->disk->driverfs_dev = &card->dev; | |
499 | ||
500 | /* | |
501 | * As discussed on lkml, GENHD_FL_REMOVABLE should: | |
502 | * | |
503 | * - be set for removable media with permanent block devices | |
504 | * - be unset for removable block devices with permanent media | |
505 | * | |
506 | * Since MMC block devices clearly fall under the second | |
507 | * case, we do not set GENHD_FL_REMOVABLE. Userspace | |
508 | * should use the block device creation/destruction hotplug | |
509 | * messages to tell when the card is present. | |
510 | */ | |
511 | ||
512 | sprintf(md->disk->disk_name, "mmcblk%d", devidx); | |
a6f6c96b | 513 | |
08846698 | 514 | blk_queue_hardsect_size(md->queue.queue, 512); |
a6f6c96b | 515 | |
85a18ad9 PO |
516 | if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) { |
517 | /* | |
518 | * The EXT_CSD sector count is in number or 512 byte | |
519 | * sectors. | |
520 | */ | |
521 | set_capacity(md->disk, card->ext_csd.sectors); | |
522 | } else { | |
523 | /* | |
524 | * The CSD capacity field is in units of read_blkbits. | |
525 | * set_capacity takes units of 512 bytes. | |
526 | */ | |
527 | set_capacity(md->disk, | |
528 | card->csd.capacity << (card->csd.read_blkbits - 9)); | |
529 | } | |
1da177e4 | 530 | return md; |
a6f6c96b RK |
531 | |
532 | err_putdisk: | |
533 | put_disk(md->disk); | |
534 | err_kfree: | |
535 | kfree(md); | |
536 | out: | |
537 | return ERR_PTR(ret); | |
1da177e4 LT |
538 | } |
539 | ||
540 | static int | |
541 | mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card) | |
542 | { | |
543 | struct mmc_command cmd; | |
544 | int err; | |
545 | ||
fba68bd2 PL |
546 | /* Block-addressed cards ignore MMC_SET_BLOCKLEN. */ |
547 | if (mmc_card_blockaddr(card)) | |
548 | return 0; | |
549 | ||
b855885e | 550 | mmc_claim_host(card->host); |
1da177e4 | 551 | cmd.opcode = MMC_SET_BLOCKLEN; |
08846698 | 552 | cmd.arg = 512; |
7213d175 | 553 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; |
1da177e4 | 554 | err = mmc_wait_for_cmd(card->host, &cmd, 5); |
b855885e | 555 | mmc_release_host(card->host); |
1da177e4 LT |
556 | |
557 | if (err) { | |
558 | printk(KERN_ERR "%s: unable to set block size to %d: %d\n", | |
559 | md->disk->disk_name, cmd.arg, err); | |
560 | return -EINVAL; | |
561 | } | |
562 | ||
563 | return 0; | |
564 | } | |
565 | ||
566 | static int mmc_blk_probe(struct mmc_card *card) | |
567 | { | |
568 | struct mmc_blk_data *md; | |
569 | int err; | |
570 | ||
a7bbb573 PO |
571 | char cap_str[10]; |
572 | ||
912490db PO |
573 | /* |
574 | * Check that the card supports the command class(es) we need. | |
575 | */ | |
576 | if (!(card->csd.cmdclass & CCC_BLOCK_READ)) | |
1da177e4 LT |
577 | return -ENODEV; |
578 | ||
1da177e4 LT |
579 | md = mmc_blk_alloc(card); |
580 | if (IS_ERR(md)) | |
581 | return PTR_ERR(md); | |
582 | ||
583 | err = mmc_blk_set_blksize(md, card); | |
584 | if (err) | |
585 | goto out; | |
586 | ||
444122fd | 587 | string_get_size((u64)get_capacity(md->disk) << 9, STRING_UNITS_2, |
a7bbb573 PO |
588 | cap_str, sizeof(cap_str)); |
589 | printk(KERN_INFO "%s: %s %s %s %s\n", | |
1da177e4 | 590 | md->disk->disk_name, mmc_card_id(card), mmc_card_name(card), |
a7bbb573 | 591 | cap_str, md->read_only ? "(ro)" : ""); |
1da177e4 LT |
592 | |
593 | mmc_set_drvdata(card, md); | |
594 | add_disk(md->disk); | |
595 | return 0; | |
596 | ||
597 | out: | |
598 | mmc_blk_put(md); | |
599 | ||
600 | return err; | |
601 | } | |
602 | ||
603 | static void mmc_blk_remove(struct mmc_card *card) | |
604 | { | |
605 | struct mmc_blk_data *md = mmc_get_drvdata(card); | |
606 | ||
607 | if (md) { | |
89b4e133 | 608 | /* Stop new requests from getting into the queue */ |
1da177e4 LT |
609 | del_gendisk(md->disk); |
610 | ||
89b4e133 PO |
611 | /* Then flush out any already in there */ |
612 | mmc_cleanup_queue(&md->queue); | |
1da177e4 | 613 | |
1da177e4 LT |
614 | mmc_blk_put(md); |
615 | } | |
616 | mmc_set_drvdata(card, NULL); | |
617 | } | |
618 | ||
619 | #ifdef CONFIG_PM | |
620 | static int mmc_blk_suspend(struct mmc_card *card, pm_message_t state) | |
621 | { | |
622 | struct mmc_blk_data *md = mmc_get_drvdata(card); | |
623 | ||
624 | if (md) { | |
625 | mmc_queue_suspend(&md->queue); | |
626 | } | |
627 | return 0; | |
628 | } | |
629 | ||
630 | static int mmc_blk_resume(struct mmc_card *card) | |
631 | { | |
632 | struct mmc_blk_data *md = mmc_get_drvdata(card); | |
633 | ||
634 | if (md) { | |
635 | mmc_blk_set_blksize(md, card); | |
636 | mmc_queue_resume(&md->queue); | |
637 | } | |
638 | return 0; | |
639 | } | |
640 | #else | |
641 | #define mmc_blk_suspend NULL | |
642 | #define mmc_blk_resume NULL | |
643 | #endif | |
644 | ||
645 | static struct mmc_driver mmc_driver = { | |
646 | .drv = { | |
647 | .name = "mmcblk", | |
648 | }, | |
649 | .probe = mmc_blk_probe, | |
650 | .remove = mmc_blk_remove, | |
651 | .suspend = mmc_blk_suspend, | |
652 | .resume = mmc_blk_resume, | |
653 | }; | |
654 | ||
655 | static int __init mmc_blk_init(void) | |
656 | { | |
9d4e98e9 | 657 | int res; |
1da177e4 | 658 | |
fe6b4c88 PO |
659 | res = register_blkdev(MMC_BLOCK_MAJOR, "mmc"); |
660 | if (res) | |
1da177e4 | 661 | goto out; |
1da177e4 | 662 | |
9d4e98e9 AM |
663 | res = mmc_register_driver(&mmc_driver); |
664 | if (res) | |
665 | goto out2; | |
1da177e4 | 666 | |
9d4e98e9 AM |
667 | return 0; |
668 | out2: | |
669 | unregister_blkdev(MMC_BLOCK_MAJOR, "mmc"); | |
1da177e4 LT |
670 | out: |
671 | return res; | |
672 | } | |
673 | ||
674 | static void __exit mmc_blk_exit(void) | |
675 | { | |
676 | mmc_unregister_driver(&mmc_driver); | |
fe6b4c88 | 677 | unregister_blkdev(MMC_BLOCK_MAJOR, "mmc"); |
1da177e4 LT |
678 | } |
679 | ||
680 | module_init(mmc_blk_init); | |
681 | module_exit(mmc_blk_exit); | |
682 | ||
683 | MODULE_LICENSE("GPL"); | |
684 | MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver"); | |
685 |