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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> | |
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 | 43 | |
6b0b6285 AW |
44 | MODULE_ALIAS("mmc:block"); |
45 | ||
1da177e4 LT |
46 | /* |
47 | * max 8 partitions per card | |
48 | */ | |
49 | #define MMC_SHIFT 3 | |
1dff3144 DW |
50 | #define MMC_NUM_MINORS (256 >> MMC_SHIFT) |
51 | ||
203c8018 | 52 | static DECLARE_BITMAP(dev_use, MMC_NUM_MINORS); |
1da177e4 | 53 | |
1da177e4 LT |
54 | /* |
55 | * There is one mmc_blk_data per slot. | |
56 | */ | |
57 | struct mmc_blk_data { | |
58 | spinlock_t lock; | |
59 | struct gendisk *disk; | |
60 | struct mmc_queue queue; | |
61 | ||
62 | unsigned int usage; | |
a6f6c96b | 63 | unsigned int read_only; |
1da177e4 LT |
64 | }; |
65 | ||
a621aaed | 66 | static DEFINE_MUTEX(open_lock); |
1da177e4 LT |
67 | |
68 | static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk) | |
69 | { | |
70 | struct mmc_blk_data *md; | |
71 | ||
a621aaed | 72 | mutex_lock(&open_lock); |
1da177e4 LT |
73 | md = disk->private_data; |
74 | if (md && md->usage == 0) | |
75 | md = NULL; | |
76 | if (md) | |
77 | md->usage++; | |
a621aaed | 78 | mutex_unlock(&open_lock); |
1da177e4 LT |
79 | |
80 | return md; | |
81 | } | |
82 | ||
83 | static void mmc_blk_put(struct mmc_blk_data *md) | |
84 | { | |
a621aaed | 85 | mutex_lock(&open_lock); |
1da177e4 LT |
86 | md->usage--; |
87 | if (md->usage == 0) { | |
f331c029 | 88 | int devidx = MINOR(disk_devt(md->disk)) >> MMC_SHIFT; |
1dff3144 DW |
89 | __clear_bit(devidx, dev_use); |
90 | ||
1da177e4 | 91 | put_disk(md->disk); |
1da177e4 LT |
92 | kfree(md); |
93 | } | |
a621aaed | 94 | mutex_unlock(&open_lock); |
1da177e4 LT |
95 | } |
96 | ||
a5a1561f | 97 | static int mmc_blk_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 98 | { |
a5a1561f | 99 | struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk); |
1da177e4 LT |
100 | int ret = -ENXIO; |
101 | ||
1da177e4 LT |
102 | if (md) { |
103 | if (md->usage == 2) | |
a5a1561f | 104 | check_disk_change(bdev); |
1da177e4 | 105 | ret = 0; |
a00fc090 | 106 | |
a5a1561f | 107 | if ((mode & FMODE_WRITE) && md->read_only) { |
70bb0896 | 108 | mmc_blk_put(md); |
a00fc090 | 109 | ret = -EROFS; |
70bb0896 | 110 | } |
1da177e4 LT |
111 | } |
112 | ||
113 | return ret; | |
114 | } | |
115 | ||
a5a1561f | 116 | static int mmc_blk_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 117 | { |
a5a1561f | 118 | struct mmc_blk_data *md = disk->private_data; |
1da177e4 LT |
119 | |
120 | mmc_blk_put(md); | |
121 | return 0; | |
122 | } | |
123 | ||
124 | static int | |
a885c8c4 | 125 | mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
1da177e4 | 126 | { |
a885c8c4 CH |
127 | geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16); |
128 | geo->heads = 4; | |
129 | geo->sectors = 16; | |
130 | return 0; | |
1da177e4 LT |
131 | } |
132 | ||
133 | static struct block_device_operations mmc_bdops = { | |
a5a1561f AV |
134 | .open = mmc_blk_open, |
135 | .release = mmc_blk_release, | |
a885c8c4 | 136 | .getgeo = mmc_blk_getgeo, |
1da177e4 LT |
137 | .owner = THIS_MODULE, |
138 | }; | |
139 | ||
140 | struct mmc_blk_request { | |
141 | struct mmc_request mrq; | |
142 | struct mmc_command cmd; | |
143 | struct mmc_command stop; | |
144 | struct mmc_data data; | |
145 | }; | |
146 | ||
ec5a19dd PO |
147 | static u32 mmc_sd_num_wr_blocks(struct mmc_card *card) |
148 | { | |
149 | int err; | |
b7a03210 | 150 | __be32 blocks; |
ec5a19dd PO |
151 | |
152 | struct mmc_request mrq; | |
153 | struct mmc_command cmd; | |
154 | struct mmc_data data; | |
155 | unsigned int timeout_us; | |
156 | ||
157 | struct scatterlist sg; | |
158 | ||
159 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
160 | ||
161 | cmd.opcode = MMC_APP_CMD; | |
162 | cmd.arg = card->rca << 16; | |
7213d175 | 163 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; |
ec5a19dd PO |
164 | |
165 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
7213d175 DB |
166 | if (err) |
167 | return (u32)-1; | |
168 | if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD)) | |
ec5a19dd PO |
169 | return (u32)-1; |
170 | ||
171 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
172 | ||
173 | cmd.opcode = SD_APP_SEND_NUM_WR_BLKS; | |
174 | cmd.arg = 0; | |
7213d175 | 175 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; |
ec5a19dd PO |
176 | |
177 | memset(&data, 0, sizeof(struct mmc_data)); | |
178 | ||
179 | data.timeout_ns = card->csd.tacc_ns * 100; | |
180 | data.timeout_clks = card->csd.tacc_clks * 100; | |
181 | ||
182 | timeout_us = data.timeout_ns / 1000; | |
183 | timeout_us += data.timeout_clks * 1000 / | |
184 | (card->host->ios.clock / 1000); | |
185 | ||
186 | if (timeout_us > 100000) { | |
187 | data.timeout_ns = 100000000; | |
188 | data.timeout_clks = 0; | |
189 | } | |
190 | ||
191 | data.blksz = 4; | |
192 | data.blocks = 1; | |
193 | data.flags = MMC_DATA_READ; | |
194 | data.sg = &sg; | |
195 | data.sg_len = 1; | |
196 | ||
197 | memset(&mrq, 0, sizeof(struct mmc_request)); | |
198 | ||
199 | mrq.cmd = &cmd; | |
200 | mrq.data = &data; | |
201 | ||
202 | sg_init_one(&sg, &blocks, 4); | |
203 | ||
204 | mmc_wait_for_req(card->host, &mrq); | |
205 | ||
17b0429d | 206 | if (cmd.error || data.error) |
ec5a19dd PO |
207 | return (u32)-1; |
208 | ||
b7a03210 | 209 | return ntohl(blocks); |
ec5a19dd PO |
210 | } |
211 | ||
504f191f AH |
212 | static u32 get_card_status(struct mmc_card *card, struct request *req) |
213 | { | |
214 | struct mmc_command cmd; | |
215 | int err; | |
216 | ||
217 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
218 | cmd.opcode = MMC_SEND_STATUS; | |
219 | if (!mmc_host_is_spi(card->host)) | |
220 | cmd.arg = card->rca << 16; | |
221 | cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC; | |
222 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
223 | if (err) | |
224 | printk(KERN_ERR "%s: error %d sending status comand", | |
225 | req->rq_disk->disk_name, err); | |
226 | return cmd.resp[0]; | |
227 | } | |
228 | ||
1da177e4 LT |
229 | static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) |
230 | { | |
231 | struct mmc_blk_data *md = mq->data; | |
232 | struct mmc_card *card = md->queue.card; | |
176f00ff | 233 | struct mmc_blk_request brq; |
6a79e391 | 234 | int ret = 1, disable_multi = 0; |
1da177e4 | 235 | |
b855885e | 236 | mmc_claim_host(card->host); |
1da177e4 LT |
237 | |
238 | do { | |
1da177e4 | 239 | struct mmc_command cmd; |
504f191f | 240 | u32 readcmd, writecmd, status = 0; |
1da177e4 LT |
241 | |
242 | memset(&brq, 0, sizeof(struct mmc_blk_request)); | |
243 | brq.mrq.cmd = &brq.cmd; | |
244 | brq.mrq.data = &brq.data; | |
245 | ||
fba68bd2 PL |
246 | brq.cmd.arg = req->sector; |
247 | if (!mmc_card_blockaddr(card)) | |
248 | brq.cmd.arg <<= 9; | |
7213d175 | 249 | brq.cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; |
08846698 | 250 | brq.data.blksz = 512; |
1da177e4 LT |
251 | brq.stop.opcode = MMC_STOP_TRANSMISSION; |
252 | brq.stop.arg = 0; | |
7213d175 | 253 | brq.stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC; |
08846698 | 254 | brq.data.blocks = req->nr_sectors; |
1da177e4 | 255 | |
6a79e391 AH |
256 | /* |
257 | * After a read error, we redo the request one sector at a time | |
258 | * in order to accurately determine which sectors can be read | |
259 | * successfully. | |
260 | */ | |
261 | if (disable_multi && brq.data.blocks > 1) | |
262 | brq.data.blocks = 1; | |
263 | ||
788ee7b0 | 264 | if (brq.data.blocks > 1) { |
7213d175 DB |
265 | /* SPI multiblock writes terminate using a special |
266 | * token, not a STOP_TRANSMISSION request. | |
267 | */ | |
268 | if (!mmc_host_is_spi(card->host) | |
269 | || rq_data_dir(req) == READ) | |
270 | brq.mrq.stop = &brq.stop; | |
db53f28b RK |
271 | readcmd = MMC_READ_MULTIPLE_BLOCK; |
272 | writecmd = MMC_WRITE_MULTIPLE_BLOCK; | |
788ee7b0 RK |
273 | } else { |
274 | brq.mrq.stop = NULL; | |
db53f28b RK |
275 | readcmd = MMC_READ_SINGLE_BLOCK; |
276 | writecmd = MMC_WRITE_BLOCK; | |
277 | } | |
278 | ||
279 | if (rq_data_dir(req) == READ) { | |
280 | brq.cmd.opcode = readcmd; | |
281 | brq.data.flags |= MMC_DATA_READ; | |
282 | } else { | |
283 | brq.cmd.opcode = writecmd; | |
284 | brq.data.flags |= MMC_DATA_WRITE; | |
788ee7b0 | 285 | } |
1da177e4 | 286 | |
b146d26a PO |
287 | mmc_set_data_timeout(&brq.data, card); |
288 | ||
1da177e4 | 289 | brq.data.sg = mq->sg; |
98ccf149 PO |
290 | brq.data.sg_len = mmc_queue_map_sg(mq); |
291 | ||
6a79e391 AH |
292 | /* |
293 | * Adjust the sg list so it is the same size as the | |
294 | * request. | |
295 | */ | |
296 | if (brq.data.blocks != req->nr_sectors) { | |
297 | int i, data_size = brq.data.blocks << 9; | |
298 | struct scatterlist *sg; | |
299 | ||
300 | for_each_sg(brq.data.sg, sg, brq.data.sg_len, i) { | |
301 | data_size -= sg->length; | |
302 | if (data_size <= 0) { | |
303 | sg->length += data_size; | |
304 | i++; | |
305 | break; | |
306 | } | |
307 | } | |
308 | brq.data.sg_len = i; | |
309 | } | |
310 | ||
98ccf149 | 311 | mmc_queue_bounce_pre(mq); |
1da177e4 LT |
312 | |
313 | mmc_wait_for_req(card->host, &brq.mrq); | |
98ccf149 PO |
314 | |
315 | mmc_queue_bounce_post(mq); | |
316 | ||
979ce720 PO |
317 | /* |
318 | * Check for errors here, but don't jump to cmd_err | |
319 | * until later as we need to wait for the card to leave | |
320 | * programming mode even when things go wrong. | |
321 | */ | |
6a79e391 AH |
322 | if (brq.cmd.error || brq.data.error || brq.stop.error) { |
323 | if (brq.data.blocks > 1 && rq_data_dir(req) == READ) { | |
324 | /* Redo read one sector at a time */ | |
325 | printk(KERN_WARNING "%s: retrying using single " | |
326 | "block read\n", req->rq_disk->disk_name); | |
327 | disable_multi = 1; | |
328 | continue; | |
329 | } | |
504f191f | 330 | status = get_card_status(card, req); |
6a79e391 | 331 | } |
504f191f | 332 | |
1da177e4 | 333 | if (brq.cmd.error) { |
504f191f AH |
334 | printk(KERN_ERR "%s: error %d sending read/write " |
335 | "command, response %#x, card status %#x\n", | |
336 | req->rq_disk->disk_name, brq.cmd.error, | |
337 | brq.cmd.resp[0], status); | |
1da177e4 LT |
338 | } |
339 | ||
340 | if (brq.data.error) { | |
504f191f AH |
341 | if (brq.data.error == -ETIMEDOUT && brq.mrq.stop) |
342 | /* 'Stop' response contains card status */ | |
343 | status = brq.mrq.stop->resp[0]; | |
344 | printk(KERN_ERR "%s: error %d transferring data," | |
345 | " sector %u, nr %u, card status %#x\n", | |
346 | req->rq_disk->disk_name, brq.data.error, | |
347 | (unsigned)req->sector, | |
348 | (unsigned)req->nr_sectors, status); | |
1da177e4 LT |
349 | } |
350 | ||
351 | if (brq.stop.error) { | |
504f191f AH |
352 | printk(KERN_ERR "%s: error %d sending stop command, " |
353 | "response %#x, card status %#x\n", | |
354 | req->rq_disk->disk_name, brq.stop.error, | |
355 | brq.stop.resp[0], status); | |
1da177e4 LT |
356 | } |
357 | ||
7213d175 | 358 | if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) { |
2ed6d22c RK |
359 | do { |
360 | int err; | |
361 | ||
362 | cmd.opcode = MMC_SEND_STATUS; | |
363 | cmd.arg = card->rca << 16; | |
364 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; | |
365 | err = mmc_wait_for_cmd(card->host, &cmd, 5); | |
366 | if (err) { | |
367 | printk(KERN_ERR "%s: error %d requesting status\n", | |
368 | req->rq_disk->disk_name, err); | |
369 | goto cmd_err; | |
370 | } | |
d198f101 PO |
371 | /* |
372 | * Some cards mishandle the status bits, | |
373 | * so make sure to check both the busy | |
374 | * indication and the card state. | |
375 | */ | |
376 | } while (!(cmd.resp[0] & R1_READY_FOR_DATA) || | |
377 | (R1_CURRENT_STATE(cmd.resp[0]) == 7)); | |
1da177e4 LT |
378 | |
379 | #if 0 | |
2ed6d22c RK |
380 | if (cmd.resp[0] & ~0x00000900) |
381 | printk(KERN_ERR "%s: status = %08x\n", | |
382 | req->rq_disk->disk_name, cmd.resp[0]); | |
383 | if (mmc_decode_status(cmd.resp)) | |
384 | goto cmd_err; | |
1da177e4 | 385 | #endif |
2ed6d22c | 386 | } |
1da177e4 | 387 | |
6a79e391 AH |
388 | if (brq.cmd.error || brq.stop.error || brq.data.error) { |
389 | if (rq_data_dir(req) == READ) { | |
390 | /* | |
391 | * After an error, we redo I/O one sector at a | |
392 | * time, so we only reach here after trying to | |
393 | * read a single sector. | |
394 | */ | |
395 | spin_lock_irq(&md->lock); | |
396 | ret = __blk_end_request(req, -EIO, brq.data.blksz); | |
397 | spin_unlock_irq(&md->lock); | |
398 | continue; | |
399 | } | |
979ce720 | 400 | goto cmd_err; |
6a79e391 | 401 | } |
979ce720 | 402 | |
1da177e4 LT |
403 | /* |
404 | * A block was successfully transferred. | |
405 | */ | |
406 | spin_lock_irq(&md->lock); | |
fd539832 | 407 | ret = __blk_end_request(req, 0, brq.data.bytes_xfered); |
1da177e4 LT |
408 | spin_unlock_irq(&md->lock); |
409 | } while (ret); | |
410 | ||
b855885e | 411 | mmc_release_host(card->host); |
1da177e4 LT |
412 | |
413 | return 1; | |
414 | ||
415 | cmd_err: | |
ec5a19dd PO |
416 | /* |
417 | * If this is an SD card and we're writing, we can first | |
418 | * mark the known good sectors as ok. | |
419 | * | |
420 | * If the card is not SD, we can still ok written sectors | |
23af6039 PO |
421 | * as reported by the controller (which might be less than |
422 | * the real number of written sectors, but never more). | |
1da177e4 | 423 | */ |
6a79e391 AH |
424 | if (mmc_card_sd(card)) { |
425 | u32 blocks; | |
23af6039 | 426 | |
6a79e391 AH |
427 | blocks = mmc_sd_num_wr_blocks(card); |
428 | if (blocks != (u32)-1) { | |
ec5a19dd | 429 | spin_lock_irq(&md->lock); |
6a79e391 | 430 | ret = __blk_end_request(req, 0, blocks << 9); |
ec5a19dd PO |
431 | spin_unlock_irq(&md->lock); |
432 | } | |
6a79e391 AH |
433 | } else { |
434 | spin_lock_irq(&md->lock); | |
435 | ret = __blk_end_request(req, 0, brq.data.bytes_xfered); | |
436 | spin_unlock_irq(&md->lock); | |
176f00ff PO |
437 | } |
438 | ||
b855885e | 439 | mmc_release_host(card->host); |
ec5a19dd | 440 | |
1da177e4 | 441 | spin_lock_irq(&md->lock); |
fd539832 KU |
442 | while (ret) |
443 | ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req)); | |
1da177e4 LT |
444 | spin_unlock_irq(&md->lock); |
445 | ||
446 | return 0; | |
447 | } | |
448 | ||
1da177e4 | 449 | |
a6f6c96b RK |
450 | static inline int mmc_blk_readonly(struct mmc_card *card) |
451 | { | |
452 | return mmc_card_readonly(card) || | |
453 | !(card->csd.cmdclass & CCC_BLOCK_WRITE); | |
454 | } | |
455 | ||
1da177e4 LT |
456 | static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card) |
457 | { | |
458 | struct mmc_blk_data *md; | |
459 | int devidx, ret; | |
460 | ||
461 | devidx = find_first_zero_bit(dev_use, MMC_NUM_MINORS); | |
462 | if (devidx >= MMC_NUM_MINORS) | |
463 | return ERR_PTR(-ENOSPC); | |
464 | __set_bit(devidx, dev_use); | |
465 | ||
dd00cc48 | 466 | md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL); |
a6f6c96b RK |
467 | if (!md) { |
468 | ret = -ENOMEM; | |
469 | goto out; | |
470 | } | |
1da177e4 | 471 | |
1da177e4 | 472 | |
a6f6c96b RK |
473 | /* |
474 | * Set the read-only status based on the supported commands | |
475 | * and the write protect switch. | |
476 | */ | |
477 | md->read_only = mmc_blk_readonly(card); | |
1da177e4 | 478 | |
a6f6c96b RK |
479 | md->disk = alloc_disk(1 << MMC_SHIFT); |
480 | if (md->disk == NULL) { | |
481 | ret = -ENOMEM; | |
482 | goto err_kfree; | |
483 | } | |
1da177e4 | 484 | |
a6f6c96b RK |
485 | spin_lock_init(&md->lock); |
486 | md->usage = 1; | |
1da177e4 | 487 | |
a6f6c96b RK |
488 | ret = mmc_init_queue(&md->queue, card, &md->lock); |
489 | if (ret) | |
490 | goto err_putdisk; | |
1da177e4 | 491 | |
a6f6c96b RK |
492 | md->queue.issue_fn = mmc_blk_issue_rq; |
493 | md->queue.data = md; | |
d2b18394 | 494 | |
fe6b4c88 | 495 | md->disk->major = MMC_BLOCK_MAJOR; |
a6f6c96b RK |
496 | md->disk->first_minor = devidx << MMC_SHIFT; |
497 | md->disk->fops = &mmc_bdops; | |
498 | md->disk->private_data = md; | |
499 | md->disk->queue = md->queue.queue; | |
500 | md->disk->driverfs_dev = &card->dev; | |
501 | ||
502 | /* | |
503 | * As discussed on lkml, GENHD_FL_REMOVABLE should: | |
504 | * | |
505 | * - be set for removable media with permanent block devices | |
506 | * - be unset for removable block devices with permanent media | |
507 | * | |
508 | * Since MMC block devices clearly fall under the second | |
509 | * case, we do not set GENHD_FL_REMOVABLE. Userspace | |
510 | * should use the block device creation/destruction hotplug | |
511 | * messages to tell when the card is present. | |
512 | */ | |
513 | ||
514 | sprintf(md->disk->disk_name, "mmcblk%d", devidx); | |
a6f6c96b | 515 | |
08846698 | 516 | blk_queue_hardsect_size(md->queue.queue, 512); |
a6f6c96b | 517 | |
85a18ad9 PO |
518 | if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) { |
519 | /* | |
520 | * The EXT_CSD sector count is in number or 512 byte | |
521 | * sectors. | |
522 | */ | |
523 | set_capacity(md->disk, card->ext_csd.sectors); | |
524 | } else { | |
525 | /* | |
526 | * The CSD capacity field is in units of read_blkbits. | |
527 | * set_capacity takes units of 512 bytes. | |
528 | */ | |
529 | set_capacity(md->disk, | |
530 | card->csd.capacity << (card->csd.read_blkbits - 9)); | |
531 | } | |
1da177e4 | 532 | return md; |
a6f6c96b RK |
533 | |
534 | err_putdisk: | |
535 | put_disk(md->disk); | |
536 | err_kfree: | |
537 | kfree(md); | |
538 | out: | |
539 | return ERR_PTR(ret); | |
1da177e4 LT |
540 | } |
541 | ||
542 | static int | |
543 | mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card) | |
544 | { | |
545 | struct mmc_command cmd; | |
546 | int err; | |
547 | ||
fba68bd2 PL |
548 | /* Block-addressed cards ignore MMC_SET_BLOCKLEN. */ |
549 | if (mmc_card_blockaddr(card)) | |
550 | return 0; | |
551 | ||
b855885e | 552 | mmc_claim_host(card->host); |
1da177e4 | 553 | cmd.opcode = MMC_SET_BLOCKLEN; |
08846698 | 554 | cmd.arg = 512; |
7213d175 | 555 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; |
1da177e4 | 556 | err = mmc_wait_for_cmd(card->host, &cmd, 5); |
b855885e | 557 | mmc_release_host(card->host); |
1da177e4 LT |
558 | |
559 | if (err) { | |
560 | printk(KERN_ERR "%s: unable to set block size to %d: %d\n", | |
561 | md->disk->disk_name, cmd.arg, err); | |
562 | return -EINVAL; | |
563 | } | |
564 | ||
565 | return 0; | |
566 | } | |
567 | ||
568 | static int mmc_blk_probe(struct mmc_card *card) | |
569 | { | |
570 | struct mmc_blk_data *md; | |
571 | int err; | |
572 | ||
a7bbb573 PO |
573 | char cap_str[10]; |
574 | ||
912490db PO |
575 | /* |
576 | * Check that the card supports the command class(es) we need. | |
577 | */ | |
578 | if (!(card->csd.cmdclass & CCC_BLOCK_READ)) | |
1da177e4 LT |
579 | return -ENODEV; |
580 | ||
1da177e4 LT |
581 | md = mmc_blk_alloc(card); |
582 | if (IS_ERR(md)) | |
583 | return PTR_ERR(md); | |
584 | ||
585 | err = mmc_blk_set_blksize(md, card); | |
586 | if (err) | |
587 | goto out; | |
588 | ||
444122fd | 589 | string_get_size((u64)get_capacity(md->disk) << 9, STRING_UNITS_2, |
a7bbb573 PO |
590 | cap_str, sizeof(cap_str)); |
591 | printk(KERN_INFO "%s: %s %s %s %s\n", | |
1da177e4 | 592 | md->disk->disk_name, mmc_card_id(card), mmc_card_name(card), |
a7bbb573 | 593 | cap_str, md->read_only ? "(ro)" : ""); |
1da177e4 LT |
594 | |
595 | mmc_set_drvdata(card, md); | |
596 | add_disk(md->disk); | |
597 | return 0; | |
598 | ||
599 | out: | |
600 | mmc_blk_put(md); | |
601 | ||
602 | return err; | |
603 | } | |
604 | ||
605 | static void mmc_blk_remove(struct mmc_card *card) | |
606 | { | |
607 | struct mmc_blk_data *md = mmc_get_drvdata(card); | |
608 | ||
609 | if (md) { | |
89b4e133 | 610 | /* Stop new requests from getting into the queue */ |
1da177e4 LT |
611 | del_gendisk(md->disk); |
612 | ||
89b4e133 PO |
613 | /* Then flush out any already in there */ |
614 | mmc_cleanup_queue(&md->queue); | |
1da177e4 | 615 | |
1da177e4 LT |
616 | mmc_blk_put(md); |
617 | } | |
618 | mmc_set_drvdata(card, NULL); | |
619 | } | |
620 | ||
621 | #ifdef CONFIG_PM | |
622 | static int mmc_blk_suspend(struct mmc_card *card, pm_message_t state) | |
623 | { | |
624 | struct mmc_blk_data *md = mmc_get_drvdata(card); | |
625 | ||
626 | if (md) { | |
627 | mmc_queue_suspend(&md->queue); | |
628 | } | |
629 | return 0; | |
630 | } | |
631 | ||
632 | static int mmc_blk_resume(struct mmc_card *card) | |
633 | { | |
634 | struct mmc_blk_data *md = mmc_get_drvdata(card); | |
635 | ||
636 | if (md) { | |
637 | mmc_blk_set_blksize(md, card); | |
638 | mmc_queue_resume(&md->queue); | |
639 | } | |
640 | return 0; | |
641 | } | |
642 | #else | |
643 | #define mmc_blk_suspend NULL | |
644 | #define mmc_blk_resume NULL | |
645 | #endif | |
646 | ||
647 | static struct mmc_driver mmc_driver = { | |
648 | .drv = { | |
649 | .name = "mmcblk", | |
650 | }, | |
651 | .probe = mmc_blk_probe, | |
652 | .remove = mmc_blk_remove, | |
653 | .suspend = mmc_blk_suspend, | |
654 | .resume = mmc_blk_resume, | |
655 | }; | |
656 | ||
657 | static int __init mmc_blk_init(void) | |
658 | { | |
9d4e98e9 | 659 | int res; |
1da177e4 | 660 | |
fe6b4c88 PO |
661 | res = register_blkdev(MMC_BLOCK_MAJOR, "mmc"); |
662 | if (res) | |
1da177e4 | 663 | goto out; |
1da177e4 | 664 | |
9d4e98e9 AM |
665 | res = mmc_register_driver(&mmc_driver); |
666 | if (res) | |
667 | goto out2; | |
1da177e4 | 668 | |
9d4e98e9 AM |
669 | return 0; |
670 | out2: | |
671 | unregister_blkdev(MMC_BLOCK_MAJOR, "mmc"); | |
1da177e4 LT |
672 | out: |
673 | return res; | |
674 | } | |
675 | ||
676 | static void __exit mmc_blk_exit(void) | |
677 | { | |
678 | mmc_unregister_driver(&mmc_driver); | |
fe6b4c88 | 679 | unregister_blkdev(MMC_BLOCK_MAJOR, "mmc"); |
1da177e4 LT |
680 | } |
681 | ||
682 | module_init(mmc_blk_init); | |
683 | module_exit(mmc_blk_exit); | |
684 | ||
685 | MODULE_LICENSE("GPL"); | |
686 | MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver"); | |
687 |