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1da177e4 LT |
1 | /* |
2 | * Block driver for media (i.e., flash cards) | |
3 | * | |
4 | * Copyright 2002 Hewlett-Packard Company | |
5 | * | |
6 | * Use consistent with the GNU GPL is permitted, | |
7 | * provided that this copyright notice is | |
8 | * preserved in its entirety in all copies and derived works. | |
9 | * | |
10 | * HEWLETT-PACKARD COMPANY MAKES NO WARRANTIES, EXPRESSED OR IMPLIED, | |
11 | * AS TO THE USEFULNESS OR CORRECTNESS OF THIS CODE OR ITS | |
12 | * FITNESS FOR ANY PARTICULAR PURPOSE. | |
13 | * | |
14 | * Many thanks to Alessandro Rubini and Jonathan Corbet! | |
15 | * | |
16 | * Author: Andrew Christian | |
17 | * 28 May 2002 | |
18 | */ | |
19 | #include <linux/moduleparam.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/init.h> | |
22 | ||
23 | #include <linux/sched.h> | |
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> | |
30 | #include <linux/devfs_fs_kernel.h> | |
31 | ||
32 | #include <linux/mmc/card.h> | |
33 | #include <linux/mmc/protocol.h> | |
34 | ||
35 | #include <asm/system.h> | |
36 | #include <asm/uaccess.h> | |
37 | ||
38 | #include "mmc_queue.h" | |
39 | ||
40 | /* | |
41 | * max 8 partitions per card | |
42 | */ | |
43 | #define MMC_SHIFT 3 | |
44 | ||
45 | static int major; | |
46 | ||
47 | /* | |
48 | * There is one mmc_blk_data per slot. | |
49 | */ | |
50 | struct mmc_blk_data { | |
51 | spinlock_t lock; | |
52 | struct gendisk *disk; | |
53 | struct mmc_queue queue; | |
54 | ||
55 | unsigned int usage; | |
56 | unsigned int block_bits; | |
57 | }; | |
58 | ||
59 | static DECLARE_MUTEX(open_lock); | |
60 | ||
61 | static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk) | |
62 | { | |
63 | struct mmc_blk_data *md; | |
64 | ||
65 | down(&open_lock); | |
66 | md = disk->private_data; | |
67 | if (md && md->usage == 0) | |
68 | md = NULL; | |
69 | if (md) | |
70 | md->usage++; | |
71 | up(&open_lock); | |
72 | ||
73 | return md; | |
74 | } | |
75 | ||
76 | static void mmc_blk_put(struct mmc_blk_data *md) | |
77 | { | |
78 | down(&open_lock); | |
79 | md->usage--; | |
80 | if (md->usage == 0) { | |
81 | put_disk(md->disk); | |
82 | mmc_cleanup_queue(&md->queue); | |
83 | kfree(md); | |
84 | } | |
85 | up(&open_lock); | |
86 | } | |
87 | ||
88 | static int mmc_blk_open(struct inode *inode, struct file *filp) | |
89 | { | |
90 | struct mmc_blk_data *md; | |
91 | int ret = -ENXIO; | |
92 | ||
93 | md = mmc_blk_get(inode->i_bdev->bd_disk); | |
94 | if (md) { | |
95 | if (md->usage == 2) | |
96 | check_disk_change(inode->i_bdev); | |
97 | ret = 0; | |
98 | } | |
99 | ||
100 | return ret; | |
101 | } | |
102 | ||
103 | static int mmc_blk_release(struct inode *inode, struct file *filp) | |
104 | { | |
105 | struct mmc_blk_data *md = inode->i_bdev->bd_disk->private_data; | |
106 | ||
107 | mmc_blk_put(md); | |
108 | return 0; | |
109 | } | |
110 | ||
111 | static int | |
112 | mmc_blk_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg) | |
113 | { | |
114 | struct block_device *bdev = inode->i_bdev; | |
115 | ||
116 | if (cmd == HDIO_GETGEO) { | |
117 | struct hd_geometry geo; | |
118 | ||
119 | memset(&geo, 0, sizeof(struct hd_geometry)); | |
120 | ||
121 | geo.cylinders = get_capacity(bdev->bd_disk) / (4 * 16); | |
122 | geo.heads = 4; | |
123 | geo.sectors = 16; | |
124 | geo.start = get_start_sect(bdev); | |
125 | ||
126 | return copy_to_user((void __user *)arg, &geo, sizeof(geo)) | |
127 | ? -EFAULT : 0; | |
128 | } | |
129 | ||
130 | return -ENOTTY; | |
131 | } | |
132 | ||
133 | static struct block_device_operations mmc_bdops = { | |
134 | .open = mmc_blk_open, | |
135 | .release = mmc_blk_release, | |
136 | .ioctl = mmc_blk_ioctl, | |
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 | ||
147 | static int mmc_blk_prep_rq(struct mmc_queue *mq, struct request *req) | |
148 | { | |
149 | struct mmc_blk_data *md = mq->data; | |
150 | int stat = BLKPREP_OK; | |
151 | ||
152 | /* | |
153 | * If we have no device, we haven't finished initialising. | |
154 | */ | |
155 | if (!md || !mq->card) { | |
156 | printk(KERN_ERR "%s: killing request - no device/host\n", | |
157 | req->rq_disk->disk_name); | |
158 | stat = BLKPREP_KILL; | |
159 | } | |
160 | ||
161 | return stat; | |
162 | } | |
163 | ||
164 | static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) | |
165 | { | |
166 | struct mmc_blk_data *md = mq->data; | |
167 | struct mmc_card *card = md->queue.card; | |
168 | int ret; | |
169 | ||
170 | if (mmc_card_claim_host(card)) | |
171 | goto cmd_err; | |
172 | ||
173 | do { | |
174 | struct mmc_blk_request brq; | |
175 | struct mmc_command cmd; | |
176 | ||
177 | memset(&brq, 0, sizeof(struct mmc_blk_request)); | |
178 | brq.mrq.cmd = &brq.cmd; | |
179 | brq.mrq.data = &brq.data; | |
180 | ||
181 | brq.cmd.arg = req->sector << 9; | |
182 | brq.cmd.flags = MMC_RSP_R1; | |
183 | brq.data.timeout_ns = card->csd.tacc_ns * 10; | |
184 | brq.data.timeout_clks = card->csd.tacc_clks * 10; | |
185 | brq.data.blksz_bits = md->block_bits; | |
186 | brq.data.blocks = req->nr_sectors >> (md->block_bits - 9); | |
187 | brq.stop.opcode = MMC_STOP_TRANSMISSION; | |
188 | brq.stop.arg = 0; | |
189 | brq.stop.flags = MMC_RSP_R1B; | |
190 | ||
191 | if (rq_data_dir(req) == READ) { | |
192 | brq.cmd.opcode = brq.data.blocks > 1 ? MMC_READ_MULTIPLE_BLOCK : MMC_READ_SINGLE_BLOCK; | |
193 | brq.data.flags |= MMC_DATA_READ; | |
194 | } else { | |
195 | brq.cmd.opcode = MMC_WRITE_BLOCK; | |
196 | brq.cmd.flags = MMC_RSP_R1B; | |
197 | brq.data.flags |= MMC_DATA_WRITE; | |
198 | brq.data.blocks = 1; | |
199 | } | |
200 | brq.mrq.stop = brq.data.blocks > 1 ? &brq.stop : NULL; | |
201 | ||
202 | brq.data.sg = mq->sg; | |
203 | brq.data.sg_len = blk_rq_map_sg(req->q, req, brq.data.sg); | |
204 | ||
205 | mmc_wait_for_req(card->host, &brq.mrq); | |
206 | if (brq.cmd.error) { | |
207 | printk(KERN_ERR "%s: error %d sending read/write command\n", | |
208 | req->rq_disk->disk_name, brq.cmd.error); | |
209 | goto cmd_err; | |
210 | } | |
211 | ||
212 | if (brq.data.error) { | |
213 | printk(KERN_ERR "%s: error %d transferring data\n", | |
214 | req->rq_disk->disk_name, brq.data.error); | |
215 | goto cmd_err; | |
216 | } | |
217 | ||
218 | if (brq.stop.error) { | |
219 | printk(KERN_ERR "%s: error %d sending stop command\n", | |
220 | req->rq_disk->disk_name, brq.stop.error); | |
221 | goto cmd_err; | |
222 | } | |
223 | ||
224 | do { | |
225 | int err; | |
226 | ||
227 | cmd.opcode = MMC_SEND_STATUS; | |
228 | cmd.arg = card->rca << 16; | |
229 | cmd.flags = MMC_RSP_R1; | |
230 | err = mmc_wait_for_cmd(card->host, &cmd, 5); | |
231 | if (err) { | |
232 | printk(KERN_ERR "%s: error %d requesting status\n", | |
233 | req->rq_disk->disk_name, err); | |
234 | goto cmd_err; | |
235 | } | |
236 | } while (!(cmd.resp[0] & R1_READY_FOR_DATA)); | |
237 | ||
238 | #if 0 | |
239 | if (cmd.resp[0] & ~0x00000900) | |
240 | printk(KERN_ERR "%s: status = %08x\n", | |
241 | req->rq_disk->disk_name, cmd.resp[0]); | |
242 | if (mmc_decode_status(cmd.resp)) | |
243 | goto cmd_err; | |
244 | #endif | |
245 | ||
246 | /* | |
247 | * A block was successfully transferred. | |
248 | */ | |
249 | spin_lock_irq(&md->lock); | |
250 | ret = end_that_request_chunk(req, 1, brq.data.bytes_xfered); | |
251 | if (!ret) { | |
252 | /* | |
253 | * The whole request completed successfully. | |
254 | */ | |
255 | add_disk_randomness(req->rq_disk); | |
256 | blkdev_dequeue_request(req); | |
257 | end_that_request_last(req); | |
258 | } | |
259 | spin_unlock_irq(&md->lock); | |
260 | } while (ret); | |
261 | ||
262 | mmc_card_release_host(card); | |
263 | ||
264 | return 1; | |
265 | ||
266 | cmd_err: | |
267 | mmc_card_release_host(card); | |
268 | ||
269 | /* | |
270 | * This is a little draconian, but until we get proper | |
271 | * error handling sorted out here, its the best we can | |
272 | * do - especially as some hosts have no idea how much | |
273 | * data was transferred before the error occurred. | |
274 | */ | |
275 | spin_lock_irq(&md->lock); | |
276 | do { | |
277 | ret = end_that_request_chunk(req, 0, | |
278 | req->current_nr_sectors << 9); | |
279 | } while (ret); | |
280 | ||
281 | add_disk_randomness(req->rq_disk); | |
282 | blkdev_dequeue_request(req); | |
283 | end_that_request_last(req); | |
284 | spin_unlock_irq(&md->lock); | |
285 | ||
286 | return 0; | |
287 | } | |
288 | ||
289 | #define MMC_NUM_MINORS (256 >> MMC_SHIFT) | |
290 | ||
291 | static unsigned long dev_use[MMC_NUM_MINORS/(8*sizeof(unsigned long))]; | |
292 | ||
293 | static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card) | |
294 | { | |
295 | struct mmc_blk_data *md; | |
296 | int devidx, ret; | |
297 | ||
298 | devidx = find_first_zero_bit(dev_use, MMC_NUM_MINORS); | |
299 | if (devidx >= MMC_NUM_MINORS) | |
300 | return ERR_PTR(-ENOSPC); | |
301 | __set_bit(devidx, dev_use); | |
302 | ||
303 | md = kmalloc(sizeof(struct mmc_blk_data), GFP_KERNEL); | |
304 | if (md) { | |
305 | memset(md, 0, sizeof(struct mmc_blk_data)); | |
306 | ||
307 | md->disk = alloc_disk(1 << MMC_SHIFT); | |
308 | if (md->disk == NULL) { | |
309 | kfree(md); | |
310 | md = ERR_PTR(-ENOMEM); | |
311 | goto out; | |
312 | } | |
313 | ||
314 | spin_lock_init(&md->lock); | |
315 | md->usage = 1; | |
316 | ||
317 | ret = mmc_init_queue(&md->queue, card, &md->lock); | |
318 | if (ret) { | |
319 | put_disk(md->disk); | |
320 | kfree(md); | |
321 | md = ERR_PTR(ret); | |
322 | goto out; | |
323 | } | |
324 | md->queue.prep_fn = mmc_blk_prep_rq; | |
325 | md->queue.issue_fn = mmc_blk_issue_rq; | |
326 | md->queue.data = md; | |
327 | ||
328 | md->disk->major = major; | |
329 | md->disk->first_minor = devidx << MMC_SHIFT; | |
330 | md->disk->fops = &mmc_bdops; | |
331 | md->disk->private_data = md; | |
332 | md->disk->queue = md->queue.queue; | |
333 | md->disk->driverfs_dev = &card->dev; | |
334 | ||
335 | /* | |
336 | * As discussed on lkml, GENHD_FL_REMOVABLE should: | |
337 | * | |
338 | * - be set for removable media with permanent block devices | |
339 | * - be unset for removable block devices with permanent media | |
340 | * | |
341 | * Since MMC block devices clearly fall under the second | |
342 | * case, we do not set GENHD_FL_REMOVABLE. Userspace | |
343 | * should use the block device creation/destruction hotplug | |
344 | * messages to tell when the card is present. | |
345 | */ | |
346 | ||
347 | sprintf(md->disk->disk_name, "mmcblk%d", devidx); | |
348 | sprintf(md->disk->devfs_name, "mmc/blk%d", devidx); | |
349 | ||
350 | md->block_bits = card->csd.read_blkbits; | |
351 | ||
352 | blk_queue_hardsect_size(md->queue.queue, 1 << md->block_bits); | |
353 | set_capacity(md->disk, card->csd.capacity); | |
354 | } | |
355 | out: | |
356 | return md; | |
357 | } | |
358 | ||
359 | static int | |
360 | mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card) | |
361 | { | |
362 | struct mmc_command cmd; | |
363 | int err; | |
364 | ||
365 | mmc_card_claim_host(card); | |
366 | cmd.opcode = MMC_SET_BLOCKLEN; | |
367 | cmd.arg = 1 << card->csd.read_blkbits; | |
368 | cmd.flags = MMC_RSP_R1; | |
369 | err = mmc_wait_for_cmd(card->host, &cmd, 5); | |
370 | mmc_card_release_host(card); | |
371 | ||
372 | if (err) { | |
373 | printk(KERN_ERR "%s: unable to set block size to %d: %d\n", | |
374 | md->disk->disk_name, cmd.arg, err); | |
375 | return -EINVAL; | |
376 | } | |
377 | ||
378 | return 0; | |
379 | } | |
380 | ||
381 | static int mmc_blk_probe(struct mmc_card *card) | |
382 | { | |
383 | struct mmc_blk_data *md; | |
384 | int err; | |
385 | ||
386 | if (card->csd.cmdclass & ~0x1ff) | |
387 | return -ENODEV; | |
388 | ||
389 | if (card->csd.read_blkbits < 9) { | |
390 | printk(KERN_WARNING "%s: read blocksize too small (%u)\n", | |
391 | mmc_card_id(card), 1 << card->csd.read_blkbits); | |
392 | return -ENODEV; | |
393 | } | |
394 | ||
395 | md = mmc_blk_alloc(card); | |
396 | if (IS_ERR(md)) | |
397 | return PTR_ERR(md); | |
398 | ||
399 | err = mmc_blk_set_blksize(md, card); | |
400 | if (err) | |
401 | goto out; | |
402 | ||
403 | printk(KERN_INFO "%s: %s %s %dKiB\n", | |
404 | md->disk->disk_name, mmc_card_id(card), mmc_card_name(card), | |
405 | (card->csd.capacity << card->csd.read_blkbits) / 1024); | |
406 | ||
407 | mmc_set_drvdata(card, md); | |
408 | add_disk(md->disk); | |
409 | return 0; | |
410 | ||
411 | out: | |
412 | mmc_blk_put(md); | |
413 | ||
414 | return err; | |
415 | } | |
416 | ||
417 | static void mmc_blk_remove(struct mmc_card *card) | |
418 | { | |
419 | struct mmc_blk_data *md = mmc_get_drvdata(card); | |
420 | ||
421 | if (md) { | |
422 | int devidx; | |
423 | ||
424 | del_gendisk(md->disk); | |
425 | ||
426 | /* | |
427 | * I think this is needed. | |
428 | */ | |
429 | md->disk->queue = NULL; | |
430 | ||
431 | devidx = md->disk->first_minor >> MMC_SHIFT; | |
432 | __clear_bit(devidx, dev_use); | |
433 | ||
434 | mmc_blk_put(md); | |
435 | } | |
436 | mmc_set_drvdata(card, NULL); | |
437 | } | |
438 | ||
439 | #ifdef CONFIG_PM | |
440 | static int mmc_blk_suspend(struct mmc_card *card, pm_message_t state) | |
441 | { | |
442 | struct mmc_blk_data *md = mmc_get_drvdata(card); | |
443 | ||
444 | if (md) { | |
445 | mmc_queue_suspend(&md->queue); | |
446 | } | |
447 | return 0; | |
448 | } | |
449 | ||
450 | static int mmc_blk_resume(struct mmc_card *card) | |
451 | { | |
452 | struct mmc_blk_data *md = mmc_get_drvdata(card); | |
453 | ||
454 | if (md) { | |
455 | mmc_blk_set_blksize(md, card); | |
456 | mmc_queue_resume(&md->queue); | |
457 | } | |
458 | return 0; | |
459 | } | |
460 | #else | |
461 | #define mmc_blk_suspend NULL | |
462 | #define mmc_blk_resume NULL | |
463 | #endif | |
464 | ||
465 | static struct mmc_driver mmc_driver = { | |
466 | .drv = { | |
467 | .name = "mmcblk", | |
468 | }, | |
469 | .probe = mmc_blk_probe, | |
470 | .remove = mmc_blk_remove, | |
471 | .suspend = mmc_blk_suspend, | |
472 | .resume = mmc_blk_resume, | |
473 | }; | |
474 | ||
475 | static int __init mmc_blk_init(void) | |
476 | { | |
477 | int res = -ENOMEM; | |
478 | ||
479 | res = register_blkdev(major, "mmc"); | |
480 | if (res < 0) { | |
481 | printk(KERN_WARNING "Unable to get major %d for MMC media: %d\n", | |
482 | major, res); | |
483 | goto out; | |
484 | } | |
485 | if (major == 0) | |
486 | major = res; | |
487 | ||
488 | devfs_mk_dir("mmc"); | |
489 | return mmc_register_driver(&mmc_driver); | |
490 | ||
491 | out: | |
492 | return res; | |
493 | } | |
494 | ||
495 | static void __exit mmc_blk_exit(void) | |
496 | { | |
497 | mmc_unregister_driver(&mmc_driver); | |
498 | devfs_remove("mmc"); | |
499 | unregister_blkdev(major, "mmc"); | |
500 | } | |
501 | ||
502 | module_init(mmc_blk_init); | |
503 | module_exit(mmc_blk_exit); | |
504 | ||
505 | MODULE_LICENSE("GPL"); | |
506 | MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver"); | |
507 | ||
508 | module_param(major, int, 0444); | |
509 | MODULE_PARM_DESC(major, "specify the major device number for MMC block driver"); |