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> |
1da177e4 LT |
32 | |
33 | #include <linux/mmc/card.h> | |
385e3227 | 34 | #include <linux/mmc/host.h> |
da7fbe58 PO |
35 | #include <linux/mmc/mmc.h> |
36 | #include <linux/mmc/sd.h> | |
1da177e4 LT |
37 | |
38 | #include <asm/system.h> | |
39 | #include <asm/uaccess.h> | |
40 | ||
98ac2162 | 41 | #include "queue.h" |
1da177e4 LT |
42 | |
43 | /* | |
44 | * max 8 partitions per card | |
45 | */ | |
46 | #define MMC_SHIFT 3 | |
1dff3144 DW |
47 | #define MMC_NUM_MINORS (256 >> MMC_SHIFT) |
48 | ||
203c8018 | 49 | static DECLARE_BITMAP(dev_use, MMC_NUM_MINORS); |
1da177e4 | 50 | |
1da177e4 LT |
51 | /* |
52 | * There is one mmc_blk_data per slot. | |
53 | */ | |
54 | struct mmc_blk_data { | |
55 | spinlock_t lock; | |
56 | struct gendisk *disk; | |
57 | struct mmc_queue queue; | |
58 | ||
59 | unsigned int usage; | |
60 | unsigned int block_bits; | |
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) { | |
1dff3144 DW |
86 | int devidx = md->disk->first_minor >> MMC_SHIFT; |
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 | ||
95 | static int mmc_blk_open(struct inode *inode, struct file *filp) | |
96 | { | |
97 | struct mmc_blk_data *md; | |
98 | int ret = -ENXIO; | |
99 | ||
100 | md = mmc_blk_get(inode->i_bdev->bd_disk); | |
101 | if (md) { | |
102 | if (md->usage == 2) | |
103 | check_disk_change(inode->i_bdev); | |
104 | ret = 0; | |
a00fc090 | 105 | |
70bb0896 AM |
106 | if ((filp->f_mode & FMODE_WRITE) && md->read_only) { |
107 | mmc_blk_put(md); | |
a00fc090 | 108 | ret = -EROFS; |
70bb0896 | 109 | } |
1da177e4 LT |
110 | } |
111 | ||
112 | return ret; | |
113 | } | |
114 | ||
115 | static int mmc_blk_release(struct inode *inode, struct file *filp) | |
116 | { | |
117 | struct mmc_blk_data *md = inode->i_bdev->bd_disk->private_data; | |
118 | ||
119 | mmc_blk_put(md); | |
120 | return 0; | |
121 | } | |
122 | ||
123 | static int | |
a885c8c4 | 124 | mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
1da177e4 | 125 | { |
a885c8c4 CH |
126 | geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16); |
127 | geo->heads = 4; | |
128 | geo->sectors = 16; | |
129 | return 0; | |
1da177e4 LT |
130 | } |
131 | ||
132 | static struct block_device_operations mmc_bdops = { | |
133 | .open = mmc_blk_open, | |
134 | .release = mmc_blk_release, | |
a885c8c4 | 135 | .getgeo = mmc_blk_getgeo, |
1da177e4 LT |
136 | .owner = THIS_MODULE, |
137 | }; | |
138 | ||
139 | struct mmc_blk_request { | |
140 | struct mmc_request mrq; | |
141 | struct mmc_command cmd; | |
142 | struct mmc_command stop; | |
143 | struct mmc_data data; | |
144 | }; | |
145 | ||
ec5a19dd PO |
146 | static u32 mmc_sd_num_wr_blocks(struct mmc_card *card) |
147 | { | |
148 | int err; | |
149 | u32 blocks; | |
150 | ||
151 | struct mmc_request mrq; | |
152 | struct mmc_command cmd; | |
153 | struct mmc_data data; | |
154 | unsigned int timeout_us; | |
155 | ||
156 | struct scatterlist sg; | |
157 | ||
158 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
159 | ||
160 | cmd.opcode = MMC_APP_CMD; | |
161 | cmd.arg = card->rca << 16; | |
7213d175 | 162 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; |
ec5a19dd PO |
163 | |
164 | err = mmc_wait_for_cmd(card->host, &cmd, 0); | |
7213d175 DB |
165 | if (err) |
166 | return (u32)-1; | |
167 | if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD)) | |
ec5a19dd PO |
168 | return (u32)-1; |
169 | ||
170 | memset(&cmd, 0, sizeof(struct mmc_command)); | |
171 | ||
172 | cmd.opcode = SD_APP_SEND_NUM_WR_BLKS; | |
173 | cmd.arg = 0; | |
7213d175 | 174 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; |
ec5a19dd PO |
175 | |
176 | memset(&data, 0, sizeof(struct mmc_data)); | |
177 | ||
178 | data.timeout_ns = card->csd.tacc_ns * 100; | |
179 | data.timeout_clks = card->csd.tacc_clks * 100; | |
180 | ||
181 | timeout_us = data.timeout_ns / 1000; | |
182 | timeout_us += data.timeout_clks * 1000 / | |
183 | (card->host->ios.clock / 1000); | |
184 | ||
185 | if (timeout_us > 100000) { | |
186 | data.timeout_ns = 100000000; | |
187 | data.timeout_clks = 0; | |
188 | } | |
189 | ||
190 | data.blksz = 4; | |
191 | data.blocks = 1; | |
192 | data.flags = MMC_DATA_READ; | |
193 | data.sg = &sg; | |
194 | data.sg_len = 1; | |
195 | ||
196 | memset(&mrq, 0, sizeof(struct mmc_request)); | |
197 | ||
198 | mrq.cmd = &cmd; | |
199 | mrq.data = &data; | |
200 | ||
201 | sg_init_one(&sg, &blocks, 4); | |
202 | ||
203 | mmc_wait_for_req(card->host, &mrq); | |
204 | ||
17b0429d | 205 | if (cmd.error || data.error) |
ec5a19dd PO |
206 | return (u32)-1; |
207 | ||
208 | blocks = ntohl(blocks); | |
209 | ||
210 | return blocks; | |
211 | } | |
212 | ||
1da177e4 LT |
213 | static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) |
214 | { | |
215 | struct mmc_blk_data *md = mq->data; | |
216 | struct mmc_card *card = md->queue.card; | |
176f00ff | 217 | struct mmc_blk_request brq; |
b41e9c7b PO |
218 | int ret = 1, data_size, i; |
219 | struct scatterlist *sg; | |
1da177e4 | 220 | |
b855885e | 221 | mmc_claim_host(card->host); |
1da177e4 LT |
222 | |
223 | do { | |
1da177e4 | 224 | struct mmc_command cmd; |
db53f28b | 225 | u32 readcmd, writecmd; |
1da177e4 LT |
226 | |
227 | memset(&brq, 0, sizeof(struct mmc_blk_request)); | |
228 | brq.mrq.cmd = &brq.cmd; | |
229 | brq.mrq.data = &brq.data; | |
230 | ||
fba68bd2 PL |
231 | brq.cmd.arg = req->sector; |
232 | if (!mmc_card_blockaddr(card)) | |
233 | brq.cmd.arg <<= 9; | |
7213d175 | 234 | brq.cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; |
2c171bf1 | 235 | brq.data.blksz = 1 << md->block_bits; |
1da177e4 LT |
236 | brq.stop.opcode = MMC_STOP_TRANSMISSION; |
237 | brq.stop.arg = 0; | |
7213d175 | 238 | brq.stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC; |
55db890a PO |
239 | brq.data.blocks = req->nr_sectors >> (md->block_bits - 9); |
240 | if (brq.data.blocks > card->host->max_blk_count) | |
241 | brq.data.blocks = card->host->max_blk_count; | |
1da177e4 | 242 | |
788ee7b0 | 243 | if (brq.data.blocks > 1) { |
7213d175 DB |
244 | /* SPI multiblock writes terminate using a special |
245 | * token, not a STOP_TRANSMISSION request. | |
246 | */ | |
247 | if (!mmc_host_is_spi(card->host) | |
248 | || rq_data_dir(req) == READ) | |
249 | brq.mrq.stop = &brq.stop; | |
db53f28b RK |
250 | readcmd = MMC_READ_MULTIPLE_BLOCK; |
251 | writecmd = MMC_WRITE_MULTIPLE_BLOCK; | |
788ee7b0 RK |
252 | } else { |
253 | brq.mrq.stop = NULL; | |
db53f28b RK |
254 | readcmd = MMC_READ_SINGLE_BLOCK; |
255 | writecmd = MMC_WRITE_BLOCK; | |
256 | } | |
257 | ||
258 | if (rq_data_dir(req) == READ) { | |
259 | brq.cmd.opcode = readcmd; | |
260 | brq.data.flags |= MMC_DATA_READ; | |
261 | } else { | |
262 | brq.cmd.opcode = writecmd; | |
263 | brq.data.flags |= MMC_DATA_WRITE; | |
788ee7b0 | 264 | } |
1da177e4 | 265 | |
b146d26a PO |
266 | mmc_set_data_timeout(&brq.data, card); |
267 | ||
1da177e4 | 268 | brq.data.sg = mq->sg; |
98ccf149 PO |
269 | brq.data.sg_len = mmc_queue_map_sg(mq); |
270 | ||
271 | mmc_queue_bounce_pre(mq); | |
1da177e4 | 272 | |
b41e9c7b PO |
273 | /* |
274 | * Adjust the sg list so it is the same size as the | |
275 | * request. | |
276 | */ | |
14d836e7 AD |
277 | if (brq.data.blocks != |
278 | (req->nr_sectors >> (md->block_bits - 9))) { | |
279 | data_size = brq.data.blocks * brq.data.blksz; | |
b41e9c7b PO |
280 | for_each_sg(brq.data.sg, sg, brq.data.sg_len, i) { |
281 | data_size -= sg->length; | |
14d836e7 | 282 | if (data_size <= 0) { |
b41e9c7b PO |
283 | sg->length += data_size; |
284 | i++; | |
14d836e7 AD |
285 | break; |
286 | } | |
287 | } | |
b41e9c7b | 288 | brq.data.sg_len = i; |
14d836e7 AD |
289 | } |
290 | ||
1da177e4 | 291 | mmc_wait_for_req(card->host, &brq.mrq); |
98ccf149 PO |
292 | |
293 | mmc_queue_bounce_post(mq); | |
294 | ||
979ce720 PO |
295 | /* |
296 | * Check for errors here, but don't jump to cmd_err | |
297 | * until later as we need to wait for the card to leave | |
298 | * programming mode even when things go wrong. | |
299 | */ | |
1da177e4 LT |
300 | if (brq.cmd.error) { |
301 | printk(KERN_ERR "%s: error %d sending read/write command\n", | |
302 | req->rq_disk->disk_name, brq.cmd.error); | |
1da177e4 LT |
303 | } |
304 | ||
305 | if (brq.data.error) { | |
306 | printk(KERN_ERR "%s: error %d transferring data\n", | |
307 | req->rq_disk->disk_name, brq.data.error); | |
1da177e4 LT |
308 | } |
309 | ||
310 | if (brq.stop.error) { | |
311 | printk(KERN_ERR "%s: error %d sending stop command\n", | |
312 | req->rq_disk->disk_name, brq.stop.error); | |
1da177e4 LT |
313 | } |
314 | ||
7213d175 | 315 | if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) { |
2ed6d22c RK |
316 | do { |
317 | int err; | |
318 | ||
319 | cmd.opcode = MMC_SEND_STATUS; | |
320 | cmd.arg = card->rca << 16; | |
321 | cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; | |
322 | err = mmc_wait_for_cmd(card->host, &cmd, 5); | |
323 | if (err) { | |
324 | printk(KERN_ERR "%s: error %d requesting status\n", | |
325 | req->rq_disk->disk_name, err); | |
326 | goto cmd_err; | |
327 | } | |
d198f101 PO |
328 | /* |
329 | * Some cards mishandle the status bits, | |
330 | * so make sure to check both the busy | |
331 | * indication and the card state. | |
332 | */ | |
333 | } while (!(cmd.resp[0] & R1_READY_FOR_DATA) || | |
334 | (R1_CURRENT_STATE(cmd.resp[0]) == 7)); | |
1da177e4 LT |
335 | |
336 | #if 0 | |
2ed6d22c RK |
337 | if (cmd.resp[0] & ~0x00000900) |
338 | printk(KERN_ERR "%s: status = %08x\n", | |
339 | req->rq_disk->disk_name, cmd.resp[0]); | |
340 | if (mmc_decode_status(cmd.resp)) | |
341 | goto cmd_err; | |
1da177e4 | 342 | #endif |
2ed6d22c | 343 | } |
1da177e4 | 344 | |
979ce720 PO |
345 | if (brq.cmd.error || brq.data.error || brq.stop.error) |
346 | goto cmd_err; | |
347 | ||
1da177e4 LT |
348 | /* |
349 | * A block was successfully transferred. | |
350 | */ | |
351 | spin_lock_irq(&md->lock); | |
fd539832 | 352 | ret = __blk_end_request(req, 0, brq.data.bytes_xfered); |
1da177e4 LT |
353 | spin_unlock_irq(&md->lock); |
354 | } while (ret); | |
355 | ||
b855885e | 356 | mmc_release_host(card->host); |
1da177e4 LT |
357 | |
358 | return 1; | |
359 | ||
360 | cmd_err: | |
ec5a19dd PO |
361 | /* |
362 | * If this is an SD card and we're writing, we can first | |
363 | * mark the known good sectors as ok. | |
364 | * | |
365 | * If the card is not SD, we can still ok written sectors | |
23af6039 PO |
366 | * as reported by the controller (which might be less than |
367 | * the real number of written sectors, but never more). | |
176f00ff PO |
368 | * |
369 | * For reads we just fail the entire chunk as that should | |
370 | * be safe in all cases. | |
1da177e4 | 371 | */ |
23af6039 PO |
372 | if (rq_data_dir(req) != READ) { |
373 | if (mmc_card_sd(card)) { | |
374 | u32 blocks; | |
375 | unsigned int bytes; | |
376 | ||
377 | blocks = mmc_sd_num_wr_blocks(card); | |
378 | if (blocks != (u32)-1) { | |
379 | if (card->csd.write_partial) | |
380 | bytes = blocks << md->block_bits; | |
381 | else | |
382 | bytes = blocks << 9; | |
383 | spin_lock_irq(&md->lock); | |
384 | ret = __blk_end_request(req, 0, bytes); | |
385 | spin_unlock_irq(&md->lock); | |
386 | } | |
387 | } else { | |
ec5a19dd | 388 | spin_lock_irq(&md->lock); |
23af6039 | 389 | ret = __blk_end_request(req, 0, brq.data.bytes_xfered); |
ec5a19dd PO |
390 | spin_unlock_irq(&md->lock); |
391 | } | |
176f00ff PO |
392 | } |
393 | ||
b855885e | 394 | mmc_release_host(card->host); |
ec5a19dd | 395 | |
1da177e4 | 396 | spin_lock_irq(&md->lock); |
fd539832 KU |
397 | while (ret) |
398 | ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req)); | |
1da177e4 LT |
399 | spin_unlock_irq(&md->lock); |
400 | ||
401 | return 0; | |
402 | } | |
403 | ||
1da177e4 | 404 | |
a6f6c96b RK |
405 | static inline int mmc_blk_readonly(struct mmc_card *card) |
406 | { | |
407 | return mmc_card_readonly(card) || | |
408 | !(card->csd.cmdclass & CCC_BLOCK_WRITE); | |
409 | } | |
410 | ||
1da177e4 LT |
411 | static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card) |
412 | { | |
413 | struct mmc_blk_data *md; | |
414 | int devidx, ret; | |
415 | ||
416 | devidx = find_first_zero_bit(dev_use, MMC_NUM_MINORS); | |
417 | if (devidx >= MMC_NUM_MINORS) | |
418 | return ERR_PTR(-ENOSPC); | |
419 | __set_bit(devidx, dev_use); | |
420 | ||
dd00cc48 | 421 | md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL); |
a6f6c96b RK |
422 | if (!md) { |
423 | ret = -ENOMEM; | |
424 | goto out; | |
425 | } | |
1da177e4 | 426 | |
1da177e4 | 427 | |
a6f6c96b RK |
428 | /* |
429 | * Set the read-only status based on the supported commands | |
430 | * and the write protect switch. | |
431 | */ | |
432 | md->read_only = mmc_blk_readonly(card); | |
1da177e4 | 433 | |
a6f6c96b | 434 | /* |
6fe9febb PO |
435 | * Both SD and MMC specifications state (although a bit |
436 | * unclearly in the MMC case) that a block size of 512 | |
437 | * bytes must always be supported by the card. | |
a6f6c96b | 438 | */ |
6fe9febb | 439 | md->block_bits = 9; |
1da177e4 | 440 | |
a6f6c96b RK |
441 | md->disk = alloc_disk(1 << MMC_SHIFT); |
442 | if (md->disk == NULL) { | |
443 | ret = -ENOMEM; | |
444 | goto err_kfree; | |
445 | } | |
1da177e4 | 446 | |
a6f6c96b RK |
447 | spin_lock_init(&md->lock); |
448 | md->usage = 1; | |
1da177e4 | 449 | |
a6f6c96b RK |
450 | ret = mmc_init_queue(&md->queue, card, &md->lock); |
451 | if (ret) | |
452 | goto err_putdisk; | |
1da177e4 | 453 | |
a6f6c96b RK |
454 | md->queue.issue_fn = mmc_blk_issue_rq; |
455 | md->queue.data = md; | |
d2b18394 | 456 | |
fe6b4c88 | 457 | md->disk->major = MMC_BLOCK_MAJOR; |
a6f6c96b RK |
458 | md->disk->first_minor = devidx << MMC_SHIFT; |
459 | md->disk->fops = &mmc_bdops; | |
460 | md->disk->private_data = md; | |
461 | md->disk->queue = md->queue.queue; | |
462 | md->disk->driverfs_dev = &card->dev; | |
463 | ||
464 | /* | |
465 | * As discussed on lkml, GENHD_FL_REMOVABLE should: | |
466 | * | |
467 | * - be set for removable media with permanent block devices | |
468 | * - be unset for removable block devices with permanent media | |
469 | * | |
470 | * Since MMC block devices clearly fall under the second | |
471 | * case, we do not set GENHD_FL_REMOVABLE. Userspace | |
472 | * should use the block device creation/destruction hotplug | |
473 | * messages to tell when the card is present. | |
474 | */ | |
475 | ||
476 | sprintf(md->disk->disk_name, "mmcblk%d", devidx); | |
a6f6c96b RK |
477 | |
478 | blk_queue_hardsect_size(md->queue.queue, 1 << md->block_bits); | |
479 | ||
85a18ad9 PO |
480 | if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) { |
481 | /* | |
482 | * The EXT_CSD sector count is in number or 512 byte | |
483 | * sectors. | |
484 | */ | |
485 | set_capacity(md->disk, card->ext_csd.sectors); | |
486 | } else { | |
487 | /* | |
488 | * The CSD capacity field is in units of read_blkbits. | |
489 | * set_capacity takes units of 512 bytes. | |
490 | */ | |
491 | set_capacity(md->disk, | |
492 | card->csd.capacity << (card->csd.read_blkbits - 9)); | |
493 | } | |
1da177e4 | 494 | return md; |
a6f6c96b RK |
495 | |
496 | err_putdisk: | |
497 | put_disk(md->disk); | |
498 | err_kfree: | |
499 | kfree(md); | |
500 | out: | |
501 | return ERR_PTR(ret); | |
1da177e4 LT |
502 | } |
503 | ||
504 | static int | |
505 | mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card) | |
506 | { | |
507 | struct mmc_command cmd; | |
508 | int err; | |
509 | ||
fba68bd2 PL |
510 | /* Block-addressed cards ignore MMC_SET_BLOCKLEN. */ |
511 | if (mmc_card_blockaddr(card)) | |
512 | return 0; | |
513 | ||
b855885e | 514 | mmc_claim_host(card->host); |
1da177e4 | 515 | cmd.opcode = MMC_SET_BLOCKLEN; |
d2b18394 | 516 | cmd.arg = 1 << md->block_bits; |
7213d175 | 517 | cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; |
1da177e4 | 518 | err = mmc_wait_for_cmd(card->host, &cmd, 5); |
b855885e | 519 | mmc_release_host(card->host); |
1da177e4 LT |
520 | |
521 | if (err) { | |
522 | printk(KERN_ERR "%s: unable to set block size to %d: %d\n", | |
523 | md->disk->disk_name, cmd.arg, err); | |
524 | return -EINVAL; | |
525 | } | |
526 | ||
527 | return 0; | |
528 | } | |
529 | ||
530 | static int mmc_blk_probe(struct mmc_card *card) | |
531 | { | |
532 | struct mmc_blk_data *md; | |
533 | int err; | |
534 | ||
912490db PO |
535 | /* |
536 | * Check that the card supports the command class(es) we need. | |
537 | */ | |
538 | if (!(card->csd.cmdclass & CCC_BLOCK_READ)) | |
1da177e4 LT |
539 | return -ENODEV; |
540 | ||
1da177e4 LT |
541 | md = mmc_blk_alloc(card); |
542 | if (IS_ERR(md)) | |
543 | return PTR_ERR(md); | |
544 | ||
545 | err = mmc_blk_set_blksize(md, card); | |
546 | if (err) | |
547 | goto out; | |
548 | ||
51828abc | 549 | printk(KERN_INFO "%s: %s %s %lluKiB %s\n", |
1da177e4 | 550 | md->disk->disk_name, mmc_card_id(card), mmc_card_name(card), |
51828abc AM |
551 | (unsigned long long)(get_capacity(md->disk) >> 1), |
552 | md->read_only ? "(ro)" : ""); | |
1da177e4 LT |
553 | |
554 | mmc_set_drvdata(card, md); | |
555 | add_disk(md->disk); | |
556 | return 0; | |
557 | ||
558 | out: | |
559 | mmc_blk_put(md); | |
560 | ||
561 | return err; | |
562 | } | |
563 | ||
564 | static void mmc_blk_remove(struct mmc_card *card) | |
565 | { | |
566 | struct mmc_blk_data *md = mmc_get_drvdata(card); | |
567 | ||
568 | if (md) { | |
89b4e133 | 569 | /* Stop new requests from getting into the queue */ |
1da177e4 LT |
570 | del_gendisk(md->disk); |
571 | ||
89b4e133 PO |
572 | /* Then flush out any already in there */ |
573 | mmc_cleanup_queue(&md->queue); | |
1da177e4 | 574 | |
1da177e4 LT |
575 | mmc_blk_put(md); |
576 | } | |
577 | mmc_set_drvdata(card, NULL); | |
578 | } | |
579 | ||
580 | #ifdef CONFIG_PM | |
581 | static int mmc_blk_suspend(struct mmc_card *card, pm_message_t state) | |
582 | { | |
583 | struct mmc_blk_data *md = mmc_get_drvdata(card); | |
584 | ||
585 | if (md) { | |
586 | mmc_queue_suspend(&md->queue); | |
587 | } | |
588 | return 0; | |
589 | } | |
590 | ||
591 | static int mmc_blk_resume(struct mmc_card *card) | |
592 | { | |
593 | struct mmc_blk_data *md = mmc_get_drvdata(card); | |
594 | ||
595 | if (md) { | |
596 | mmc_blk_set_blksize(md, card); | |
597 | mmc_queue_resume(&md->queue); | |
598 | } | |
599 | return 0; | |
600 | } | |
601 | #else | |
602 | #define mmc_blk_suspend NULL | |
603 | #define mmc_blk_resume NULL | |
604 | #endif | |
605 | ||
606 | static struct mmc_driver mmc_driver = { | |
607 | .drv = { | |
608 | .name = "mmcblk", | |
609 | }, | |
610 | .probe = mmc_blk_probe, | |
611 | .remove = mmc_blk_remove, | |
612 | .suspend = mmc_blk_suspend, | |
613 | .resume = mmc_blk_resume, | |
614 | }; | |
615 | ||
616 | static int __init mmc_blk_init(void) | |
617 | { | |
9d4e98e9 | 618 | int res; |
1da177e4 | 619 | |
fe6b4c88 PO |
620 | res = register_blkdev(MMC_BLOCK_MAJOR, "mmc"); |
621 | if (res) | |
1da177e4 | 622 | goto out; |
1da177e4 | 623 | |
9d4e98e9 AM |
624 | res = mmc_register_driver(&mmc_driver); |
625 | if (res) | |
626 | goto out2; | |
1da177e4 | 627 | |
9d4e98e9 AM |
628 | return 0; |
629 | out2: | |
630 | unregister_blkdev(MMC_BLOCK_MAJOR, "mmc"); | |
1da177e4 LT |
631 | out: |
632 | return res; | |
633 | } | |
634 | ||
635 | static void __exit mmc_blk_exit(void) | |
636 | { | |
637 | mmc_unregister_driver(&mmc_driver); | |
fe6b4c88 | 638 | unregister_blkdev(MMC_BLOCK_MAJOR, "mmc"); |
1da177e4 LT |
639 | } |
640 | ||
641 | module_init(mmc_blk_init); | |
642 | module_exit(mmc_blk_exit); | |
643 | ||
644 | MODULE_LICENSE("GPL"); | |
645 | MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver"); | |
646 |