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47a72688 AM |
1 | /* vmu-flash.c |
2 | * Driver for SEGA Dreamcast Visual Memory Unit | |
3 | * | |
4 | * Copyright (c) Adrian McMenamin 2002 - 2009 | |
5 | * Copyright (c) Paul Mundt 2001 | |
6 | * | |
7 | * Licensed under version 2 of the | |
8 | * GNU General Public Licence | |
9 | */ | |
10 | #include <linux/init.h> | |
11 | #include <linux/sched.h> | |
12 | #include <linux/delay.h> | |
13 | #include <linux/maple.h> | |
14 | #include <linux/mtd/mtd.h> | |
15 | #include <linux/mtd/map.h> | |
16 | ||
17 | struct vmu_cache { | |
18 | unsigned char *buffer; /* Cache */ | |
19 | unsigned int block; /* Which block was cached */ | |
20 | unsigned long jiffies_atc; /* When was it cached? */ | |
21 | int valid; | |
22 | }; | |
23 | ||
24 | struct mdev_part { | |
25 | struct maple_device *mdev; | |
26 | int partition; | |
27 | }; | |
28 | ||
29 | struct vmupart { | |
30 | u16 user_blocks; | |
31 | u16 root_block; | |
32 | u16 numblocks; | |
33 | char *name; | |
34 | struct vmu_cache *pcache; | |
35 | }; | |
36 | ||
37 | struct memcard { | |
38 | u16 tempA; | |
39 | u16 tempB; | |
40 | u32 partitions; | |
41 | u32 blocklen; | |
42 | u32 writecnt; | |
43 | u32 readcnt; | |
44 | u32 removeable; | |
45 | int partition; | |
46 | int read; | |
47 | unsigned char *blockread; | |
48 | struct vmupart *parts; | |
49 | struct mtd_info *mtd; | |
50 | }; | |
51 | ||
52 | struct vmu_block { | |
53 | unsigned int num; /* block number */ | |
54 | unsigned int ofs; /* block offset */ | |
55 | }; | |
56 | ||
57 | static struct vmu_block *ofs_to_block(unsigned long src_ofs, | |
58 | struct mtd_info *mtd, int partition) | |
59 | { | |
60 | struct vmu_block *vblock; | |
61 | struct maple_device *mdev; | |
62 | struct memcard *card; | |
63 | struct mdev_part *mpart; | |
64 | int num; | |
65 | ||
66 | mpart = mtd->priv; | |
67 | mdev = mpart->mdev; | |
68 | card = maple_get_drvdata(mdev); | |
69 | ||
70 | if (src_ofs >= card->parts[partition].numblocks * card->blocklen) | |
71 | goto failed; | |
72 | ||
73 | num = src_ofs / card->blocklen; | |
74 | if (num > card->parts[partition].numblocks) | |
75 | goto failed; | |
76 | ||
77 | vblock = kmalloc(sizeof(struct vmu_block), GFP_KERNEL); | |
78 | if (!vblock) | |
79 | goto failed; | |
80 | ||
81 | vblock->num = num; | |
82 | vblock->ofs = src_ofs % card->blocklen; | |
83 | return vblock; | |
84 | ||
85 | failed: | |
86 | return NULL; | |
87 | } | |
88 | ||
89 | /* Maple bus callback function for reads */ | |
90 | static void vmu_blockread(struct mapleq *mq) | |
91 | { | |
92 | struct maple_device *mdev; | |
93 | struct memcard *card; | |
94 | ||
95 | mdev = mq->dev; | |
96 | card = maple_get_drvdata(mdev); | |
97 | /* copy the read in data */ | |
98 | ||
99 | if (unlikely(!card->blockread)) | |
100 | return; | |
101 | ||
102 | memcpy(card->blockread, mq->recvbuf->buf + 12, | |
103 | card->blocklen/card->readcnt); | |
104 | ||
105 | } | |
106 | ||
107 | /* Interface with maple bus to read blocks | |
108 | * caching the results so that other parts | |
109 | * of the driver can access block reads */ | |
110 | static int maple_vmu_read_block(unsigned int num, unsigned char *buf, | |
111 | struct mtd_info *mtd) | |
112 | { | |
113 | struct memcard *card; | |
114 | struct mdev_part *mpart; | |
115 | struct maple_device *mdev; | |
116 | int partition, error = 0, x, wait; | |
117 | unsigned char *blockread = NULL; | |
118 | struct vmu_cache *pcache; | |
119 | __be32 sendbuf; | |
120 | ||
121 | mpart = mtd->priv; | |
122 | mdev = mpart->mdev; | |
123 | partition = mpart->partition; | |
124 | card = maple_get_drvdata(mdev); | |
125 | pcache = card->parts[partition].pcache; | |
126 | pcache->valid = 0; | |
127 | ||
128 | /* prepare the cache for this block */ | |
129 | if (!pcache->buffer) { | |
130 | pcache->buffer = kmalloc(card->blocklen, GFP_KERNEL); | |
131 | if (!pcache->buffer) { | |
132 | dev_err(&mdev->dev, "VMU at (%d, %d) - read fails due" | |
133 | " to lack of memory\n", mdev->port, | |
134 | mdev->unit); | |
135 | error = -ENOMEM; | |
136 | goto outB; | |
137 | } | |
138 | } | |
139 | ||
140 | /* | |
141 | * Reads may be phased - again the hardware spec | |
142 | * supports this - though may not be any devices in | |
143 | * the wild that implement it, but we will here | |
144 | */ | |
145 | for (x = 0; x < card->readcnt; x++) { | |
146 | sendbuf = cpu_to_be32(partition << 24 | x << 16 | num); | |
147 | ||
148 | if (atomic_read(&mdev->busy) == 1) { | |
149 | wait_event_interruptible_timeout(mdev->maple_wait, | |
150 | atomic_read(&mdev->busy) == 0, HZ); | |
151 | if (atomic_read(&mdev->busy) == 1) { | |
152 | dev_notice(&mdev->dev, "VMU at (%d, %d)" | |
153 | " is busy\n", mdev->port, mdev->unit); | |
154 | error = -EAGAIN; | |
155 | goto outB; | |
156 | } | |
157 | } | |
158 | ||
159 | atomic_set(&mdev->busy, 1); | |
160 | blockread = kmalloc(card->blocklen/card->readcnt, GFP_KERNEL); | |
161 | if (!blockread) { | |
162 | error = -ENOMEM; | |
163 | atomic_set(&mdev->busy, 0); | |
164 | goto outB; | |
165 | } | |
166 | card->blockread = blockread; | |
167 | ||
168 | maple_getcond_callback(mdev, vmu_blockread, 0, | |
169 | MAPLE_FUNC_MEMCARD); | |
170 | error = maple_add_packet(mdev, MAPLE_FUNC_MEMCARD, | |
171 | MAPLE_COMMAND_BREAD, 2, &sendbuf); | |
172 | /* Very long timeouts seem to be needed when box is stressed */ | |
173 | wait = wait_event_interruptible_timeout(mdev->maple_wait, | |
174 | (atomic_read(&mdev->busy) == 0 || | |
175 | atomic_read(&mdev->busy) == 2), HZ * 3); | |
176 | /* | |
177 | * MTD layer does not handle hotplugging well | |
178 | * so have to return errors when VMU is unplugged | |
179 | * in the middle of a read (busy == 2) | |
180 | */ | |
181 | if (error || atomic_read(&mdev->busy) == 2) { | |
182 | if (atomic_read(&mdev->busy) == 2) | |
183 | error = -ENXIO; | |
184 | atomic_set(&mdev->busy, 0); | |
185 | card->blockread = NULL; | |
186 | goto outA; | |
187 | } | |
188 | if (wait == 0 || wait == -ERESTARTSYS) { | |
189 | card->blockread = NULL; | |
190 | atomic_set(&mdev->busy, 0); | |
191 | error = -EIO; | |
192 | list_del_init(&(mdev->mq->list)); | |
193 | kfree(mdev->mq->sendbuf); | |
194 | mdev->mq->sendbuf = NULL; | |
195 | if (wait == -ERESTARTSYS) { | |
196 | dev_warn(&mdev->dev, "VMU read on (%d, %d)" | |
197 | " interrupted on block 0x%X\n", | |
198 | mdev->port, mdev->unit, num); | |
199 | } else | |
200 | dev_notice(&mdev->dev, "VMU read on (%d, %d)" | |
201 | " timed out on block 0x%X\n", | |
202 | mdev->port, mdev->unit, num); | |
203 | goto outA; | |
204 | } | |
205 | ||
206 | memcpy(buf + (card->blocklen/card->readcnt) * x, blockread, | |
207 | card->blocklen/card->readcnt); | |
208 | ||
209 | memcpy(pcache->buffer + (card->blocklen/card->readcnt) * x, | |
210 | card->blockread, card->blocklen/card->readcnt); | |
211 | card->blockread = NULL; | |
212 | pcache->block = num; | |
213 | pcache->jiffies_atc = jiffies; | |
214 | pcache->valid = 1; | |
215 | kfree(blockread); | |
216 | } | |
217 | ||
218 | return error; | |
219 | ||
220 | outA: | |
221 | kfree(blockread); | |
222 | outB: | |
223 | return error; | |
224 | } | |
225 | ||
226 | /* communicate with maple bus for phased writing */ | |
227 | static int maple_vmu_write_block(unsigned int num, const unsigned char *buf, | |
228 | struct mtd_info *mtd) | |
229 | { | |
230 | struct memcard *card; | |
231 | struct mdev_part *mpart; | |
232 | struct maple_device *mdev; | |
233 | int partition, error, locking, x, phaselen, wait; | |
234 | __be32 *sendbuf; | |
235 | ||
236 | mpart = mtd->priv; | |
237 | mdev = mpart->mdev; | |
238 | partition = mpart->partition; | |
239 | card = maple_get_drvdata(mdev); | |
240 | ||
241 | phaselen = card->blocklen/card->writecnt; | |
242 | ||
243 | sendbuf = kmalloc(phaselen + 4, GFP_KERNEL); | |
244 | if (!sendbuf) { | |
245 | error = -ENOMEM; | |
246 | goto fail_nosendbuf; | |
247 | } | |
248 | for (x = 0; x < card->writecnt; x++) { | |
249 | sendbuf[0] = cpu_to_be32(partition << 24 | x << 16 | num); | |
250 | memcpy(&sendbuf[1], buf + phaselen * x, phaselen); | |
251 | /* wait until the device is not busy doing something else | |
252 | * or 1 second - which ever is longer */ | |
253 | if (atomic_read(&mdev->busy) == 1) { | |
254 | wait_event_interruptible_timeout(mdev->maple_wait, | |
255 | atomic_read(&mdev->busy) == 0, HZ); | |
256 | if (atomic_read(&mdev->busy) == 1) { | |
257 | error = -EBUSY; | |
258 | dev_notice(&mdev->dev, "VMU write at (%d, %d)" | |
259 | "failed - device is busy\n", | |
260 | mdev->port, mdev->unit); | |
261 | goto fail_nolock; | |
262 | } | |
263 | } | |
264 | atomic_set(&mdev->busy, 1); | |
265 | ||
266 | locking = maple_add_packet(mdev, MAPLE_FUNC_MEMCARD, | |
267 | MAPLE_COMMAND_BWRITE, phaselen / 4 + 2, sendbuf); | |
268 | wait = wait_event_interruptible_timeout(mdev->maple_wait, | |
269 | atomic_read(&mdev->busy) == 0, HZ/10); | |
270 | if (locking) { | |
271 | error = -EIO; | |
272 | atomic_set(&mdev->busy, 0); | |
273 | goto fail_nolock; | |
274 | } | |
275 | if (atomic_read(&mdev->busy) == 2) { | |
276 | atomic_set(&mdev->busy, 0); | |
277 | } else if (wait == 0 || wait == -ERESTARTSYS) { | |
278 | error = -EIO; | |
279 | dev_warn(&mdev->dev, "Write at (%d, %d) of block" | |
280 | " 0x%X at phase %d failed: could not" | |
281 | " communicate with VMU", mdev->port, | |
282 | mdev->unit, num, x); | |
283 | atomic_set(&mdev->busy, 0); | |
284 | kfree(mdev->mq->sendbuf); | |
285 | mdev->mq->sendbuf = NULL; | |
286 | list_del_init(&(mdev->mq->list)); | |
287 | goto fail_nolock; | |
288 | } | |
289 | } | |
290 | kfree(sendbuf); | |
291 | ||
292 | return card->blocklen; | |
293 | ||
294 | fail_nolock: | |
295 | kfree(sendbuf); | |
296 | fail_nosendbuf: | |
297 | dev_err(&mdev->dev, "VMU (%d, %d): write failed\n", mdev->port, | |
298 | mdev->unit); | |
299 | return error; | |
300 | } | |
301 | ||
302 | /* mtd function to simulate reading byte by byte */ | |
303 | static unsigned char vmu_flash_read_char(unsigned long ofs, int *retval, | |
304 | struct mtd_info *mtd) | |
305 | { | |
306 | struct vmu_block *vblock; | |
307 | struct memcard *card; | |
308 | struct mdev_part *mpart; | |
309 | struct maple_device *mdev; | |
310 | unsigned char *buf, ret; | |
311 | int partition, error; | |
312 | ||
313 | mpart = mtd->priv; | |
314 | mdev = mpart->mdev; | |
315 | partition = mpart->partition; | |
316 | card = maple_get_drvdata(mdev); | |
317 | *retval = 0; | |
318 | ||
319 | buf = kmalloc(card->blocklen, GFP_KERNEL); | |
320 | if (!buf) { | |
321 | *retval = 1; | |
322 | ret = -ENOMEM; | |
323 | goto finish; | |
324 | } | |
325 | ||
326 | vblock = ofs_to_block(ofs, mtd, partition); | |
327 | if (!vblock) { | |
328 | *retval = 3; | |
329 | ret = -ENOMEM; | |
330 | goto out_buf; | |
331 | } | |
332 | ||
333 | error = maple_vmu_read_block(vblock->num, buf, mtd); | |
334 | if (error) { | |
335 | ret = error; | |
336 | *retval = 2; | |
337 | goto out_vblock; | |
338 | } | |
339 | ||
340 | ret = buf[vblock->ofs]; | |
341 | ||
342 | out_vblock: | |
343 | kfree(vblock); | |
344 | out_buf: | |
345 | kfree(buf); | |
346 | finish: | |
347 | return ret; | |
348 | } | |
349 | ||
350 | /* mtd higher order function to read flash */ | |
351 | static int vmu_flash_read(struct mtd_info *mtd, loff_t from, size_t len, | |
352 | size_t *retlen, u_char *buf) | |
353 | { | |
354 | struct maple_device *mdev; | |
355 | struct memcard *card; | |
356 | struct mdev_part *mpart; | |
357 | struct vmu_cache *pcache; | |
358 | struct vmu_block *vblock; | |
359 | int index = 0, retval, partition, leftover, numblocks; | |
360 | unsigned char cx; | |
361 | ||
362 | if (len < 1) | |
363 | return -EIO; | |
364 | ||
365 | mpart = mtd->priv; | |
366 | mdev = mpart->mdev; | |
367 | partition = mpart->partition; | |
368 | card = maple_get_drvdata(mdev); | |
369 | ||
370 | numblocks = card->parts[partition].numblocks; | |
371 | if (from + len > numblocks * card->blocklen) | |
372 | len = numblocks * card->blocklen - from; | |
373 | if (len == 0) | |
374 | return -EIO; | |
375 | /* Have we cached this bit already? */ | |
376 | pcache = card->parts[partition].pcache; | |
377 | do { | |
378 | vblock = ofs_to_block(from + index, mtd, partition); | |
379 | if (!vblock) | |
380 | return -ENOMEM; | |
381 | /* Have we cached this and is the cache valid and timely? */ | |
382 | if (pcache->valid && | |
383 | time_before(jiffies, pcache->jiffies_atc + HZ) && | |
384 | (pcache->block == vblock->num)) { | |
385 | /* we have cached it, so do necessary copying */ | |
386 | leftover = card->blocklen - vblock->ofs; | |
387 | if (vblock->ofs + len - index < card->blocklen) { | |
388 | /* only a bit of this block to copy */ | |
389 | memcpy(buf + index, | |
390 | pcache->buffer + vblock->ofs, | |
391 | len - index); | |
392 | index = len; | |
393 | } else { | |
394 | /* otherwise copy remainder of whole block */ | |
395 | memcpy(buf + index, pcache->buffer + | |
396 | vblock->ofs, leftover); | |
397 | index += leftover; | |
398 | } | |
399 | } else { | |
400 | /* | |
401 | * Not cached so read one byte - | |
402 | * but cache the rest of the block | |
403 | */ | |
404 | cx = vmu_flash_read_char(from + index, &retval, mtd); | |
405 | if (retval) { | |
406 | *retlen = index; | |
407 | kfree(vblock); | |
408 | return cx; | |
409 | } | |
410 | memset(buf + index, cx, 1); | |
411 | index++; | |
412 | } | |
413 | kfree(vblock); | |
414 | } while (len > index); | |
415 | *retlen = index; | |
416 | ||
417 | return 0; | |
418 | } | |
419 | ||
420 | static int vmu_flash_write(struct mtd_info *mtd, loff_t to, size_t len, | |
421 | size_t *retlen, const u_char *buf) | |
422 | { | |
423 | struct maple_device *mdev; | |
424 | struct memcard *card; | |
425 | struct mdev_part *mpart; | |
426 | int index = 0, partition, error = 0, numblocks; | |
427 | struct vmu_cache *pcache; | |
428 | struct vmu_block *vblock; | |
429 | unsigned char *buffer; | |
430 | ||
431 | mpart = mtd->priv; | |
432 | mdev = mpart->mdev; | |
433 | partition = mpart->partition; | |
434 | card = maple_get_drvdata(mdev); | |
435 | ||
436 | /* simple sanity checks */ | |
437 | if (len < 1) { | |
438 | error = -EIO; | |
439 | goto failed; | |
440 | } | |
441 | numblocks = card->parts[partition].numblocks; | |
442 | if (to + len > numblocks * card->blocklen) | |
443 | len = numblocks * card->blocklen - to; | |
444 | if (len == 0) { | |
445 | error = -EIO; | |
446 | goto failed; | |
447 | } | |
448 | ||
449 | vblock = ofs_to_block(to, mtd, partition); | |
450 | if (!vblock) { | |
451 | error = -ENOMEM; | |
452 | goto failed; | |
453 | } | |
454 | ||
455 | buffer = kmalloc(card->blocklen, GFP_KERNEL); | |
456 | if (!buffer) { | |
457 | error = -ENOMEM; | |
458 | goto fail_buffer; | |
459 | } | |
460 | ||
461 | do { | |
462 | /* Read in the block we are to write to */ | |
463 | error = maple_vmu_read_block(vblock->num, buffer, mtd); | |
464 | if (error) | |
465 | goto fail_io; | |
466 | ||
467 | do { | |
468 | buffer[vblock->ofs] = buf[index]; | |
469 | vblock->ofs++; | |
470 | index++; | |
471 | if (index >= len) | |
472 | break; | |
473 | } while (vblock->ofs < card->blocklen); | |
474 | ||
475 | /* write out new buffer */ | |
476 | error = maple_vmu_write_block(vblock->num, buffer, mtd); | |
477 | /* invalidate the cache */ | |
478 | pcache = card->parts[partition].pcache; | |
479 | pcache->valid = 0; | |
480 | ||
481 | if (error != card->blocklen) | |
482 | goto fail_io; | |
483 | ||
484 | vblock->num++; | |
485 | vblock->ofs = 0; | |
486 | } while (len > index); | |
487 | ||
488 | kfree(buffer); | |
489 | *retlen = index; | |
490 | kfree(vblock); | |
491 | return 0; | |
492 | ||
493 | fail_io: | |
494 | kfree(buffer); | |
495 | fail_buffer: | |
496 | kfree(vblock); | |
497 | failed: | |
498 | dev_err(&mdev->dev, "VMU write failing with error %d\n", error); | |
499 | return error; | |
500 | } | |
501 | ||
502 | static void vmu_flash_sync(struct mtd_info *mtd) | |
503 | { | |
504 | /* Do nothing here */ | |
505 | } | |
506 | ||
507 | /* Maple bus callback function to recursively query hardware details */ | |
508 | static void vmu_queryblocks(struct mapleq *mq) | |
509 | { | |
510 | struct maple_device *mdev; | |
511 | unsigned short *res; | |
512 | struct memcard *card; | |
513 | __be32 partnum; | |
514 | struct vmu_cache *pcache; | |
515 | struct mdev_part *mpart; | |
516 | struct mtd_info *mtd_cur; | |
517 | struct vmupart *part_cur; | |
518 | int error; | |
519 | ||
520 | mdev = mq->dev; | |
521 | card = maple_get_drvdata(mdev); | |
522 | res = (unsigned short *) (mq->recvbuf->buf); | |
523 | card->tempA = res[12]; | |
524 | card->tempB = res[6]; | |
525 | ||
526 | dev_info(&mdev->dev, "VMU device at partition %d has %d user " | |
527 | "blocks with a root block at %d\n", card->partition, | |
528 | card->tempA, card->tempB); | |
529 | ||
530 | part_cur = &card->parts[card->partition]; | |
531 | part_cur->user_blocks = card->tempA; | |
532 | part_cur->root_block = card->tempB; | |
533 | part_cur->numblocks = card->tempB + 1; | |
534 | part_cur->name = kmalloc(12, GFP_KERNEL); | |
535 | if (!part_cur->name) | |
536 | goto fail_name; | |
537 | ||
538 | sprintf(part_cur->name, "vmu%d.%d.%d", | |
539 | mdev->port, mdev->unit, card->partition); | |
540 | mtd_cur = &card->mtd[card->partition]; | |
541 | mtd_cur->name = part_cur->name; | |
542 | mtd_cur->type = 8; | |
543 | mtd_cur->flags = MTD_WRITEABLE|MTD_NO_ERASE; | |
544 | mtd_cur->size = part_cur->numblocks * card->blocklen; | |
545 | mtd_cur->erasesize = card->blocklen; | |
546 | mtd_cur->write = vmu_flash_write; | |
547 | mtd_cur->read = vmu_flash_read; | |
548 | mtd_cur->sync = vmu_flash_sync; | |
549 | mtd_cur->writesize = card->blocklen; | |
550 | ||
551 | mpart = kmalloc(sizeof(struct mdev_part), GFP_KERNEL); | |
552 | if (!mpart) | |
553 | goto fail_mpart; | |
554 | ||
555 | mpart->mdev = mdev; | |
556 | mpart->partition = card->partition; | |
557 | mtd_cur->priv = mpart; | |
558 | mtd_cur->owner = THIS_MODULE; | |
559 | ||
560 | pcache = kzalloc(sizeof(struct vmu_cache), GFP_KERNEL); | |
561 | if (!pcache) | |
562 | goto fail_cache_create; | |
563 | part_cur->pcache = pcache; | |
564 | ||
565 | error = add_mtd_device(mtd_cur); | |
566 | if (error) | |
567 | goto fail_mtd_register; | |
568 | ||
569 | maple_getcond_callback(mdev, NULL, 0, | |
570 | MAPLE_FUNC_MEMCARD); | |
571 | ||
572 | /* | |
573 | * Set up a recursive call to the (probably theoretical) | |
574 | * second or more partition | |
575 | */ | |
576 | if (++card->partition < card->partitions) { | |
577 | partnum = cpu_to_be32(card->partition << 24); | |
578 | maple_getcond_callback(mdev, vmu_queryblocks, 0, | |
579 | MAPLE_FUNC_MEMCARD); | |
580 | maple_add_packet(mdev, MAPLE_FUNC_MEMCARD, | |
581 | MAPLE_COMMAND_GETMINFO, 2, &partnum); | |
582 | } | |
583 | return; | |
584 | ||
585 | fail_mtd_register: | |
586 | dev_err(&mdev->dev, "Could not register maple device at (%d, %d)" | |
587 | "error is 0x%X\n", mdev->port, mdev->unit, error); | |
588 | for (error = 0; error <= card->partition; error++) { | |
589 | kfree(((card->parts)[error]).pcache); | |
590 | ((card->parts)[error]).pcache = NULL; | |
591 | } | |
592 | fail_cache_create: | |
593 | fail_mpart: | |
594 | for (error = 0; error <= card->partition; error++) { | |
595 | kfree(((card->mtd)[error]).priv); | |
596 | ((card->mtd)[error]).priv = NULL; | |
597 | } | |
598 | maple_getcond_callback(mdev, NULL, 0, | |
599 | MAPLE_FUNC_MEMCARD); | |
600 | kfree(part_cur->name); | |
601 | fail_name: | |
602 | return; | |
603 | } | |
604 | ||
605 | /* Handles very basic info about the flash, queries for details */ | |
606 | static int __devinit vmu_connect(struct maple_device *mdev) | |
607 | { | |
608 | unsigned long test_flash_data, basic_flash_data; | |
609 | int c, error; | |
610 | struct memcard *card; | |
611 | u32 partnum = 0; | |
612 | ||
613 | test_flash_data = be32_to_cpu(mdev->devinfo.function); | |
614 | /* Need to count how many bits are set - to find out which | |
615 | * function_data element has details of the memory card: | |
616 | * using Brian Kernighan's/Peter Wegner's method */ | |
617 | for (c = 0; test_flash_data; c++) | |
618 | test_flash_data &= test_flash_data - 1; | |
619 | ||
620 | basic_flash_data = be32_to_cpu(mdev->devinfo.function_data[c - 1]); | |
621 | ||
622 | card = kmalloc(sizeof(struct memcard), GFP_KERNEL); | |
623 | if (!card) { | |
624 | error = ENOMEM; | |
625 | goto fail_nomem; | |
626 | } | |
627 | ||
628 | card->partitions = (basic_flash_data >> 24 & 0xFF) + 1; | |
629 | card->blocklen = ((basic_flash_data >> 16 & 0xFF) + 1) << 5; | |
630 | card->writecnt = basic_flash_data >> 12 & 0xF; | |
631 | card->readcnt = basic_flash_data >> 8 & 0xF; | |
632 | card->removeable = basic_flash_data >> 7 & 1; | |
633 | ||
634 | card->partition = 0; | |
635 | ||
636 | /* | |
637 | * Not sure there are actually any multi-partition devices in the | |
638 | * real world, but the hardware supports them, so, so will we | |
639 | */ | |
640 | card->parts = kmalloc(sizeof(struct vmupart) * card->partitions, | |
641 | GFP_KERNEL); | |
642 | if (!card->parts) { | |
643 | error = -ENOMEM; | |
644 | goto fail_partitions; | |
645 | } | |
646 | ||
647 | card->mtd = kmalloc(sizeof(struct mtd_info) * card->partitions, | |
648 | GFP_KERNEL); | |
649 | if (!card->mtd) { | |
650 | error = -ENOMEM; | |
651 | goto fail_mtd_info; | |
652 | } | |
653 | ||
654 | maple_set_drvdata(mdev, card); | |
655 | ||
656 | /* | |
657 | * We want to trap meminfo not get cond | |
658 | * so set interval to zero, but rely on maple bus | |
659 | * driver to pass back the results of the meminfo | |
660 | */ | |
661 | maple_getcond_callback(mdev, vmu_queryblocks, 0, | |
662 | MAPLE_FUNC_MEMCARD); | |
663 | ||
664 | /* Make sure we are clear to go */ | |
665 | if (atomic_read(&mdev->busy) == 1) { | |
666 | wait_event_interruptible_timeout(mdev->maple_wait, | |
667 | atomic_read(&mdev->busy) == 0, HZ); | |
668 | if (atomic_read(&mdev->busy) == 1) { | |
669 | dev_notice(&mdev->dev, "VMU at (%d, %d) is busy\n", | |
670 | mdev->port, mdev->unit); | |
671 | error = -EAGAIN; | |
672 | goto fail_device_busy; | |
673 | } | |
674 | } | |
675 | ||
676 | atomic_set(&mdev->busy, 1); | |
677 | ||
678 | /* | |
679 | * Set up the minfo call: vmu_queryblocks will handle | |
680 | * the information passed back | |
681 | */ | |
682 | error = maple_add_packet(mdev, MAPLE_FUNC_MEMCARD, | |
683 | MAPLE_COMMAND_GETMINFO, 2, &partnum); | |
684 | if (error) { | |
685 | dev_err(&mdev->dev, "Could not lock VMU at (%d, %d)" | |
686 | " error is 0x%X\n", mdev->port, mdev->unit, error); | |
687 | goto fail_mtd_info; | |
688 | } | |
689 | return 0; | |
690 | ||
691 | fail_device_busy: | |
692 | kfree(card->mtd); | |
693 | fail_mtd_info: | |
694 | kfree(card->parts); | |
695 | fail_partitions: | |
696 | kfree(card); | |
697 | fail_nomem: | |
698 | return error; | |
699 | } | |
700 | ||
701 | static void __devexit vmu_disconnect(struct maple_device *mdev) | |
702 | { | |
703 | struct memcard *card; | |
704 | struct mdev_part *mpart; | |
705 | int x; | |
706 | ||
707 | mdev->callback = NULL; | |
708 | card = maple_get_drvdata(mdev); | |
709 | for (x = 0; x < card->partitions; x++) { | |
710 | mpart = ((card->mtd)[x]).priv; | |
711 | mpart->mdev = NULL; | |
712 | del_mtd_device(&((card->mtd)[x])); | |
713 | kfree(((card->parts)[x]).name); | |
714 | } | |
715 | kfree(card->parts); | |
716 | kfree(card->mtd); | |
717 | kfree(card); | |
718 | } | |
719 | ||
720 | /* Callback to handle eccentricities of both mtd subsystem | |
721 | * and general flakyness of Dreamcast VMUs | |
722 | */ | |
723 | static int vmu_can_unload(struct maple_device *mdev) | |
724 | { | |
725 | struct memcard *card; | |
726 | int x; | |
727 | struct mtd_info *mtd; | |
728 | ||
729 | card = maple_get_drvdata(mdev); | |
730 | for (x = 0; x < card->partitions; x++) { | |
731 | mtd = &((card->mtd)[x]); | |
732 | if (mtd->usecount > 0) | |
733 | return 0; | |
734 | } | |
735 | return 1; | |
736 | } | |
737 | ||
738 | #define ERRSTR "VMU at (%d, %d) file error -" | |
739 | ||
740 | static void vmu_file_error(struct maple_device *mdev, void *recvbuf) | |
741 | { | |
742 | enum maple_file_errors error = ((int *)recvbuf)[1]; | |
743 | ||
744 | switch (error) { | |
745 | ||
746 | case MAPLE_FILEERR_INVALID_PARTITION: | |
747 | dev_notice(&mdev->dev, ERRSTR " invalid partition number\n", | |
748 | mdev->port, mdev->unit); | |
749 | break; | |
750 | ||
751 | case MAPLE_FILEERR_PHASE_ERROR: | |
752 | dev_notice(&mdev->dev, ERRSTR " phase error\n", | |
753 | mdev->port, mdev->unit); | |
754 | break; | |
755 | ||
756 | case MAPLE_FILEERR_INVALID_BLOCK: | |
757 | dev_notice(&mdev->dev, ERRSTR " invalid block number\n", | |
758 | mdev->port, mdev->unit); | |
759 | break; | |
760 | ||
761 | case MAPLE_FILEERR_WRITE_ERROR: | |
762 | dev_notice(&mdev->dev, ERRSTR " write error\n", | |
763 | mdev->port, mdev->unit); | |
764 | break; | |
765 | ||
766 | case MAPLE_FILEERR_INVALID_WRITE_LENGTH: | |
767 | dev_notice(&mdev->dev, ERRSTR " invalid write length\n", | |
768 | mdev->port, mdev->unit); | |
769 | break; | |
770 | ||
771 | case MAPLE_FILEERR_BAD_CRC: | |
772 | dev_notice(&mdev->dev, ERRSTR " bad CRC\n", | |
773 | mdev->port, mdev->unit); | |
774 | break; | |
775 | ||
776 | default: | |
777 | dev_notice(&mdev->dev, ERRSTR " 0x%X\n", | |
778 | mdev->port, mdev->unit, error); | |
779 | } | |
780 | } | |
781 | ||
782 | ||
783 | static int __devinit probe_maple_vmu(struct device *dev) | |
784 | { | |
785 | int error; | |
786 | struct maple_device *mdev = to_maple_dev(dev); | |
787 | struct maple_driver *mdrv = to_maple_driver(dev->driver); | |
788 | ||
789 | mdev->can_unload = vmu_can_unload; | |
790 | mdev->fileerr_handler = vmu_file_error; | |
791 | mdev->driver = mdrv; | |
792 | ||
793 | error = vmu_connect(mdev); | |
794 | if (error) | |
795 | return error; | |
796 | ||
797 | return 0; | |
798 | } | |
799 | ||
800 | static int __devexit remove_maple_vmu(struct device *dev) | |
801 | { | |
802 | struct maple_device *mdev = to_maple_dev(dev); | |
803 | ||
804 | vmu_disconnect(mdev); | |
805 | return 0; | |
806 | } | |
807 | ||
808 | static struct maple_driver vmu_flash_driver = { | |
809 | .function = MAPLE_FUNC_MEMCARD, | |
810 | .drv = { | |
811 | .name = "Dreamcast_visual_memory", | |
812 | .probe = probe_maple_vmu, | |
813 | .remove = __devexit_p(remove_maple_vmu), | |
814 | }, | |
815 | }; | |
816 | ||
817 | static int __init vmu_flash_map_init(void) | |
818 | { | |
819 | return maple_driver_register(&vmu_flash_driver); | |
820 | } | |
821 | ||
822 | static void __exit vmu_flash_map_exit(void) | |
823 | { | |
824 | maple_driver_unregister(&vmu_flash_driver); | |
825 | } | |
826 | ||
827 | module_init(vmu_flash_map_init); | |
828 | module_exit(vmu_flash_map_exit); | |
829 | ||
830 | MODULE_LICENSE("GPL"); | |
831 | MODULE_AUTHOR("Adrian McMenamin"); | |
832 | MODULE_DESCRIPTION("Flash mapping for Sega Dreamcast visual memory"); |