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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> | |
5a0e3ad6 | 11 | #include <linux/slab.h> |
47a72688 AM |
12 | #include <linux/sched.h> |
13 | #include <linux/delay.h> | |
14 | #include <linux/maple.h> | |
15 | #include <linux/mtd/mtd.h> | |
16 | #include <linux/mtd/map.h> | |
17 | ||
18 | struct vmu_cache { | |
19 | unsigned char *buffer; /* Cache */ | |
20 | unsigned int block; /* Which block was cached */ | |
21 | unsigned long jiffies_atc; /* When was it cached? */ | |
22 | int valid; | |
23 | }; | |
24 | ||
25 | struct mdev_part { | |
26 | struct maple_device *mdev; | |
27 | int partition; | |
28 | }; | |
29 | ||
30 | struct vmupart { | |
31 | u16 user_blocks; | |
32 | u16 root_block; | |
33 | u16 numblocks; | |
34 | char *name; | |
35 | struct vmu_cache *pcache; | |
36 | }; | |
37 | ||
38 | struct memcard { | |
39 | u16 tempA; | |
40 | u16 tempB; | |
41 | u32 partitions; | |
42 | u32 blocklen; | |
43 | u32 writecnt; | |
44 | u32 readcnt; | |
45 | u32 removeable; | |
46 | int partition; | |
47 | int read; | |
48 | unsigned char *blockread; | |
49 | struct vmupart *parts; | |
50 | struct mtd_info *mtd; | |
51 | }; | |
52 | ||
53 | struct vmu_block { | |
54 | unsigned int num; /* block number */ | |
55 | unsigned int ofs; /* block offset */ | |
56 | }; | |
57 | ||
58 | static struct vmu_block *ofs_to_block(unsigned long src_ofs, | |
59 | struct mtd_info *mtd, int partition) | |
60 | { | |
61 | struct vmu_block *vblock; | |
62 | struct maple_device *mdev; | |
63 | struct memcard *card; | |
64 | struct mdev_part *mpart; | |
65 | int num; | |
66 | ||
67 | mpart = mtd->priv; | |
68 | mdev = mpart->mdev; | |
69 | card = maple_get_drvdata(mdev); | |
70 | ||
71 | if (src_ofs >= card->parts[partition].numblocks * card->blocklen) | |
72 | goto failed; | |
73 | ||
74 | num = src_ofs / card->blocklen; | |
75 | if (num > card->parts[partition].numblocks) | |
76 | goto failed; | |
77 | ||
78 | vblock = kmalloc(sizeof(struct vmu_block), GFP_KERNEL); | |
79 | if (!vblock) | |
80 | goto failed; | |
81 | ||
82 | vblock->num = num; | |
83 | vblock->ofs = src_ofs % card->blocklen; | |
84 | return vblock; | |
85 | ||
86 | failed: | |
87 | return NULL; | |
88 | } | |
89 | ||
90 | /* Maple bus callback function for reads */ | |
91 | static void vmu_blockread(struct mapleq *mq) | |
92 | { | |
93 | struct maple_device *mdev; | |
94 | struct memcard *card; | |
95 | ||
96 | mdev = mq->dev; | |
97 | card = maple_get_drvdata(mdev); | |
98 | /* copy the read in data */ | |
99 | ||
100 | if (unlikely(!card->blockread)) | |
101 | return; | |
102 | ||
103 | memcpy(card->blockread, mq->recvbuf->buf + 12, | |
104 | card->blocklen/card->readcnt); | |
105 | ||
106 | } | |
107 | ||
108 | /* Interface with maple bus to read blocks | |
109 | * caching the results so that other parts | |
110 | * of the driver can access block reads */ | |
111 | static int maple_vmu_read_block(unsigned int num, unsigned char *buf, | |
112 | struct mtd_info *mtd) | |
113 | { | |
114 | struct memcard *card; | |
115 | struct mdev_part *mpart; | |
116 | struct maple_device *mdev; | |
117 | int partition, error = 0, x, wait; | |
118 | unsigned char *blockread = NULL; | |
119 | struct vmu_cache *pcache; | |
120 | __be32 sendbuf; | |
121 | ||
122 | mpart = mtd->priv; | |
123 | mdev = mpart->mdev; | |
124 | partition = mpart->partition; | |
125 | card = maple_get_drvdata(mdev); | |
126 | pcache = card->parts[partition].pcache; | |
127 | pcache->valid = 0; | |
128 | ||
129 | /* prepare the cache for this block */ | |
130 | if (!pcache->buffer) { | |
131 | pcache->buffer = kmalloc(card->blocklen, GFP_KERNEL); | |
132 | if (!pcache->buffer) { | |
133 | dev_err(&mdev->dev, "VMU at (%d, %d) - read fails due" | |
134 | " to lack of memory\n", mdev->port, | |
135 | mdev->unit); | |
136 | error = -ENOMEM; | |
137 | goto outB; | |
138 | } | |
139 | } | |
140 | ||
141 | /* | |
142 | * Reads may be phased - again the hardware spec | |
143 | * supports this - though may not be any devices in | |
144 | * the wild that implement it, but we will here | |
145 | */ | |
146 | for (x = 0; x < card->readcnt; x++) { | |
147 | sendbuf = cpu_to_be32(partition << 24 | x << 16 | num); | |
148 | ||
149 | if (atomic_read(&mdev->busy) == 1) { | |
150 | wait_event_interruptible_timeout(mdev->maple_wait, | |
151 | atomic_read(&mdev->busy) == 0, HZ); | |
152 | if (atomic_read(&mdev->busy) == 1) { | |
153 | dev_notice(&mdev->dev, "VMU at (%d, %d)" | |
154 | " is busy\n", mdev->port, mdev->unit); | |
155 | error = -EAGAIN; | |
156 | goto outB; | |
157 | } | |
158 | } | |
159 | ||
160 | atomic_set(&mdev->busy, 1); | |
161 | blockread = kmalloc(card->blocklen/card->readcnt, GFP_KERNEL); | |
162 | if (!blockread) { | |
163 | error = -ENOMEM; | |
164 | atomic_set(&mdev->busy, 0); | |
165 | goto outB; | |
166 | } | |
167 | card->blockread = blockread; | |
168 | ||
169 | maple_getcond_callback(mdev, vmu_blockread, 0, | |
170 | MAPLE_FUNC_MEMCARD); | |
171 | error = maple_add_packet(mdev, MAPLE_FUNC_MEMCARD, | |
172 | MAPLE_COMMAND_BREAD, 2, &sendbuf); | |
173 | /* Very long timeouts seem to be needed when box is stressed */ | |
174 | wait = wait_event_interruptible_timeout(mdev->maple_wait, | |
175 | (atomic_read(&mdev->busy) == 0 || | |
176 | atomic_read(&mdev->busy) == 2), HZ * 3); | |
177 | /* | |
178 | * MTD layer does not handle hotplugging well | |
179 | * so have to return errors when VMU is unplugged | |
180 | * in the middle of a read (busy == 2) | |
181 | */ | |
182 | if (error || atomic_read(&mdev->busy) == 2) { | |
183 | if (atomic_read(&mdev->busy) == 2) | |
184 | error = -ENXIO; | |
185 | atomic_set(&mdev->busy, 0); | |
186 | card->blockread = NULL; | |
187 | goto outA; | |
188 | } | |
189 | if (wait == 0 || wait == -ERESTARTSYS) { | |
190 | card->blockread = NULL; | |
191 | atomic_set(&mdev->busy, 0); | |
192 | error = -EIO; | |
193 | list_del_init(&(mdev->mq->list)); | |
194 | kfree(mdev->mq->sendbuf); | |
195 | mdev->mq->sendbuf = NULL; | |
196 | if (wait == -ERESTARTSYS) { | |
197 | dev_warn(&mdev->dev, "VMU read on (%d, %d)" | |
198 | " interrupted on block 0x%X\n", | |
199 | mdev->port, mdev->unit, num); | |
200 | } else | |
201 | dev_notice(&mdev->dev, "VMU read on (%d, %d)" | |
202 | " timed out on block 0x%X\n", | |
203 | mdev->port, mdev->unit, num); | |
204 | goto outA; | |
205 | } | |
206 | ||
207 | memcpy(buf + (card->blocklen/card->readcnt) * x, blockread, | |
208 | card->blocklen/card->readcnt); | |
209 | ||
210 | memcpy(pcache->buffer + (card->blocklen/card->readcnt) * x, | |
211 | card->blockread, card->blocklen/card->readcnt); | |
212 | card->blockread = NULL; | |
213 | pcache->block = num; | |
214 | pcache->jiffies_atc = jiffies; | |
215 | pcache->valid = 1; | |
216 | kfree(blockread); | |
217 | } | |
218 | ||
219 | return error; | |
220 | ||
221 | outA: | |
222 | kfree(blockread); | |
223 | outB: | |
224 | return error; | |
225 | } | |
226 | ||
227 | /* communicate with maple bus for phased writing */ | |
228 | static int maple_vmu_write_block(unsigned int num, const unsigned char *buf, | |
229 | struct mtd_info *mtd) | |
230 | { | |
231 | struct memcard *card; | |
232 | struct mdev_part *mpart; | |
233 | struct maple_device *mdev; | |
234 | int partition, error, locking, x, phaselen, wait; | |
235 | __be32 *sendbuf; | |
236 | ||
237 | mpart = mtd->priv; | |
238 | mdev = mpart->mdev; | |
239 | partition = mpart->partition; | |
240 | card = maple_get_drvdata(mdev); | |
241 | ||
242 | phaselen = card->blocklen/card->writecnt; | |
243 | ||
244 | sendbuf = kmalloc(phaselen + 4, GFP_KERNEL); | |
245 | if (!sendbuf) { | |
246 | error = -ENOMEM; | |
247 | goto fail_nosendbuf; | |
248 | } | |
249 | for (x = 0; x < card->writecnt; x++) { | |
250 | sendbuf[0] = cpu_to_be32(partition << 24 | x << 16 | num); | |
251 | memcpy(&sendbuf[1], buf + phaselen * x, phaselen); | |
252 | /* wait until the device is not busy doing something else | |
253 | * or 1 second - which ever is longer */ | |
254 | if (atomic_read(&mdev->busy) == 1) { | |
255 | wait_event_interruptible_timeout(mdev->maple_wait, | |
256 | atomic_read(&mdev->busy) == 0, HZ); | |
257 | if (atomic_read(&mdev->busy) == 1) { | |
258 | error = -EBUSY; | |
259 | dev_notice(&mdev->dev, "VMU write at (%d, %d)" | |
260 | "failed - device is busy\n", | |
261 | mdev->port, mdev->unit); | |
262 | goto fail_nolock; | |
263 | } | |
264 | } | |
265 | atomic_set(&mdev->busy, 1); | |
266 | ||
267 | locking = maple_add_packet(mdev, MAPLE_FUNC_MEMCARD, | |
268 | MAPLE_COMMAND_BWRITE, phaselen / 4 + 2, sendbuf); | |
269 | wait = wait_event_interruptible_timeout(mdev->maple_wait, | |
270 | atomic_read(&mdev->busy) == 0, HZ/10); | |
271 | if (locking) { | |
272 | error = -EIO; | |
273 | atomic_set(&mdev->busy, 0); | |
274 | goto fail_nolock; | |
275 | } | |
276 | if (atomic_read(&mdev->busy) == 2) { | |
277 | atomic_set(&mdev->busy, 0); | |
278 | } else if (wait == 0 || wait == -ERESTARTSYS) { | |
279 | error = -EIO; | |
280 | dev_warn(&mdev->dev, "Write at (%d, %d) of block" | |
281 | " 0x%X at phase %d failed: could not" | |
282 | " communicate with VMU", mdev->port, | |
283 | mdev->unit, num, x); | |
284 | atomic_set(&mdev->busy, 0); | |
285 | kfree(mdev->mq->sendbuf); | |
286 | mdev->mq->sendbuf = NULL; | |
287 | list_del_init(&(mdev->mq->list)); | |
288 | goto fail_nolock; | |
289 | } | |
290 | } | |
291 | kfree(sendbuf); | |
292 | ||
293 | return card->blocklen; | |
294 | ||
295 | fail_nolock: | |
296 | kfree(sendbuf); | |
297 | fail_nosendbuf: | |
298 | dev_err(&mdev->dev, "VMU (%d, %d): write failed\n", mdev->port, | |
299 | mdev->unit); | |
300 | return error; | |
301 | } | |
302 | ||
303 | /* mtd function to simulate reading byte by byte */ | |
304 | static unsigned char vmu_flash_read_char(unsigned long ofs, int *retval, | |
305 | struct mtd_info *mtd) | |
306 | { | |
307 | struct vmu_block *vblock; | |
308 | struct memcard *card; | |
309 | struct mdev_part *mpart; | |
310 | struct maple_device *mdev; | |
311 | unsigned char *buf, ret; | |
312 | int partition, error; | |
313 | ||
314 | mpart = mtd->priv; | |
315 | mdev = mpart->mdev; | |
316 | partition = mpart->partition; | |
317 | card = maple_get_drvdata(mdev); | |
318 | *retval = 0; | |
319 | ||
320 | buf = kmalloc(card->blocklen, GFP_KERNEL); | |
321 | if (!buf) { | |
322 | *retval = 1; | |
323 | ret = -ENOMEM; | |
324 | goto finish; | |
325 | } | |
326 | ||
327 | vblock = ofs_to_block(ofs, mtd, partition); | |
328 | if (!vblock) { | |
329 | *retval = 3; | |
330 | ret = -ENOMEM; | |
331 | goto out_buf; | |
332 | } | |
333 | ||
334 | error = maple_vmu_read_block(vblock->num, buf, mtd); | |
335 | if (error) { | |
336 | ret = error; | |
337 | *retval = 2; | |
338 | goto out_vblock; | |
339 | } | |
340 | ||
341 | ret = buf[vblock->ofs]; | |
342 | ||
343 | out_vblock: | |
344 | kfree(vblock); | |
345 | out_buf: | |
346 | kfree(buf); | |
347 | finish: | |
348 | return ret; | |
349 | } | |
350 | ||
351 | /* mtd higher order function to read flash */ | |
352 | static int vmu_flash_read(struct mtd_info *mtd, loff_t from, size_t len, | |
353 | size_t *retlen, u_char *buf) | |
354 | { | |
355 | struct maple_device *mdev; | |
356 | struct memcard *card; | |
357 | struct mdev_part *mpart; | |
358 | struct vmu_cache *pcache; | |
359 | struct vmu_block *vblock; | |
360 | int index = 0, retval, partition, leftover, numblocks; | |
361 | unsigned char cx; | |
362 | ||
47a72688 AM |
363 | mpart = mtd->priv; |
364 | mdev = mpart->mdev; | |
365 | partition = mpart->partition; | |
366 | card = maple_get_drvdata(mdev); | |
367 | ||
368 | numblocks = card->parts[partition].numblocks; | |
369 | if (from + len > numblocks * card->blocklen) | |
370 | len = numblocks * card->blocklen - from; | |
371 | if (len == 0) | |
372 | return -EIO; | |
373 | /* Have we cached this bit already? */ | |
374 | pcache = card->parts[partition].pcache; | |
375 | do { | |
376 | vblock = ofs_to_block(from + index, mtd, partition); | |
377 | if (!vblock) | |
378 | return -ENOMEM; | |
379 | /* Have we cached this and is the cache valid and timely? */ | |
380 | if (pcache->valid && | |
381 | time_before(jiffies, pcache->jiffies_atc + HZ) && | |
382 | (pcache->block == vblock->num)) { | |
383 | /* we have cached it, so do necessary copying */ | |
384 | leftover = card->blocklen - vblock->ofs; | |
385 | if (vblock->ofs + len - index < card->blocklen) { | |
386 | /* only a bit of this block to copy */ | |
387 | memcpy(buf + index, | |
388 | pcache->buffer + vblock->ofs, | |
389 | len - index); | |
390 | index = len; | |
391 | } else { | |
392 | /* otherwise copy remainder of whole block */ | |
393 | memcpy(buf + index, pcache->buffer + | |
394 | vblock->ofs, leftover); | |
395 | index += leftover; | |
396 | } | |
397 | } else { | |
398 | /* | |
399 | * Not cached so read one byte - | |
400 | * but cache the rest of the block | |
401 | */ | |
402 | cx = vmu_flash_read_char(from + index, &retval, mtd); | |
403 | if (retval) { | |
404 | *retlen = index; | |
405 | kfree(vblock); | |
406 | return cx; | |
407 | } | |
408 | memset(buf + index, cx, 1); | |
409 | index++; | |
410 | } | |
411 | kfree(vblock); | |
412 | } while (len > index); | |
413 | *retlen = index; | |
414 | ||
415 | return 0; | |
416 | } | |
417 | ||
418 | static int vmu_flash_write(struct mtd_info *mtd, loff_t to, size_t len, | |
419 | size_t *retlen, const u_char *buf) | |
420 | { | |
421 | struct maple_device *mdev; | |
422 | struct memcard *card; | |
423 | struct mdev_part *mpart; | |
424 | int index = 0, partition, error = 0, numblocks; | |
425 | struct vmu_cache *pcache; | |
426 | struct vmu_block *vblock; | |
427 | unsigned char *buffer; | |
428 | ||
429 | mpart = mtd->priv; | |
430 | mdev = mpart->mdev; | |
431 | partition = mpart->partition; | |
432 | card = maple_get_drvdata(mdev); | |
433 | ||
47a72688 AM |
434 | numblocks = card->parts[partition].numblocks; |
435 | if (to + len > numblocks * card->blocklen) | |
436 | len = numblocks * card->blocklen - to; | |
437 | if (len == 0) { | |
438 | error = -EIO; | |
439 | goto failed; | |
440 | } | |
441 | ||
442 | vblock = ofs_to_block(to, mtd, partition); | |
443 | if (!vblock) { | |
444 | error = -ENOMEM; | |
445 | goto failed; | |
446 | } | |
447 | ||
448 | buffer = kmalloc(card->blocklen, GFP_KERNEL); | |
449 | if (!buffer) { | |
450 | error = -ENOMEM; | |
451 | goto fail_buffer; | |
452 | } | |
453 | ||
454 | do { | |
455 | /* Read in the block we are to write to */ | |
456 | error = maple_vmu_read_block(vblock->num, buffer, mtd); | |
457 | if (error) | |
458 | goto fail_io; | |
459 | ||
460 | do { | |
461 | buffer[vblock->ofs] = buf[index]; | |
462 | vblock->ofs++; | |
463 | index++; | |
464 | if (index >= len) | |
465 | break; | |
466 | } while (vblock->ofs < card->blocklen); | |
467 | ||
468 | /* write out new buffer */ | |
469 | error = maple_vmu_write_block(vblock->num, buffer, mtd); | |
470 | /* invalidate the cache */ | |
471 | pcache = card->parts[partition].pcache; | |
472 | pcache->valid = 0; | |
473 | ||
474 | if (error != card->blocklen) | |
475 | goto fail_io; | |
476 | ||
477 | vblock->num++; | |
478 | vblock->ofs = 0; | |
479 | } while (len > index); | |
480 | ||
481 | kfree(buffer); | |
482 | *retlen = index; | |
483 | kfree(vblock); | |
484 | return 0; | |
485 | ||
486 | fail_io: | |
487 | kfree(buffer); | |
488 | fail_buffer: | |
489 | kfree(vblock); | |
490 | failed: | |
491 | dev_err(&mdev->dev, "VMU write failing with error %d\n", error); | |
492 | return error; | |
493 | } | |
494 | ||
495 | static void vmu_flash_sync(struct mtd_info *mtd) | |
496 | { | |
497 | /* Do nothing here */ | |
498 | } | |
499 | ||
500 | /* Maple bus callback function to recursively query hardware details */ | |
501 | static void vmu_queryblocks(struct mapleq *mq) | |
502 | { | |
503 | struct maple_device *mdev; | |
504 | unsigned short *res; | |
505 | struct memcard *card; | |
506 | __be32 partnum; | |
507 | struct vmu_cache *pcache; | |
508 | struct mdev_part *mpart; | |
509 | struct mtd_info *mtd_cur; | |
510 | struct vmupart *part_cur; | |
511 | int error; | |
512 | ||
513 | mdev = mq->dev; | |
514 | card = maple_get_drvdata(mdev); | |
515 | res = (unsigned short *) (mq->recvbuf->buf); | |
516 | card->tempA = res[12]; | |
517 | card->tempB = res[6]; | |
518 | ||
519 | dev_info(&mdev->dev, "VMU device at partition %d has %d user " | |
520 | "blocks with a root block at %d\n", card->partition, | |
521 | card->tempA, card->tempB); | |
522 | ||
523 | part_cur = &card->parts[card->partition]; | |
524 | part_cur->user_blocks = card->tempA; | |
525 | part_cur->root_block = card->tempB; | |
526 | part_cur->numblocks = card->tempB + 1; | |
527 | part_cur->name = kmalloc(12, GFP_KERNEL); | |
528 | if (!part_cur->name) | |
529 | goto fail_name; | |
530 | ||
531 | sprintf(part_cur->name, "vmu%d.%d.%d", | |
532 | mdev->port, mdev->unit, card->partition); | |
533 | mtd_cur = &card->mtd[card->partition]; | |
534 | mtd_cur->name = part_cur->name; | |
535 | mtd_cur->type = 8; | |
536 | mtd_cur->flags = MTD_WRITEABLE|MTD_NO_ERASE; | |
537 | mtd_cur->size = part_cur->numblocks * card->blocklen; | |
538 | mtd_cur->erasesize = card->blocklen; | |
3c3c10bb AB |
539 | mtd_cur->_write = vmu_flash_write; |
540 | mtd_cur->_read = vmu_flash_read; | |
541 | mtd_cur->_sync = vmu_flash_sync; | |
47a72688 AM |
542 | mtd_cur->writesize = card->blocklen; |
543 | ||
544 | mpart = kmalloc(sizeof(struct mdev_part), GFP_KERNEL); | |
545 | if (!mpart) | |
546 | goto fail_mpart; | |
547 | ||
548 | mpart->mdev = mdev; | |
549 | mpart->partition = card->partition; | |
550 | mtd_cur->priv = mpart; | |
551 | mtd_cur->owner = THIS_MODULE; | |
552 | ||
553 | pcache = kzalloc(sizeof(struct vmu_cache), GFP_KERNEL); | |
554 | if (!pcache) | |
555 | goto fail_cache_create; | |
556 | part_cur->pcache = pcache; | |
557 | ||
ee0e87b1 | 558 | error = mtd_device_register(mtd_cur, NULL, 0); |
47a72688 AM |
559 | if (error) |
560 | goto fail_mtd_register; | |
561 | ||
562 | maple_getcond_callback(mdev, NULL, 0, | |
563 | MAPLE_FUNC_MEMCARD); | |
564 | ||
565 | /* | |
566 | * Set up a recursive call to the (probably theoretical) | |
567 | * second or more partition | |
568 | */ | |
569 | if (++card->partition < card->partitions) { | |
570 | partnum = cpu_to_be32(card->partition << 24); | |
571 | maple_getcond_callback(mdev, vmu_queryblocks, 0, | |
572 | MAPLE_FUNC_MEMCARD); | |
573 | maple_add_packet(mdev, MAPLE_FUNC_MEMCARD, | |
574 | MAPLE_COMMAND_GETMINFO, 2, &partnum); | |
575 | } | |
576 | return; | |
577 | ||
578 | fail_mtd_register: | |
579 | dev_err(&mdev->dev, "Could not register maple device at (%d, %d)" | |
580 | "error is 0x%X\n", mdev->port, mdev->unit, error); | |
581 | for (error = 0; error <= card->partition; error++) { | |
582 | kfree(((card->parts)[error]).pcache); | |
583 | ((card->parts)[error]).pcache = NULL; | |
584 | } | |
585 | fail_cache_create: | |
586 | fail_mpart: | |
587 | for (error = 0; error <= card->partition; error++) { | |
588 | kfree(((card->mtd)[error]).priv); | |
589 | ((card->mtd)[error]).priv = NULL; | |
590 | } | |
591 | maple_getcond_callback(mdev, NULL, 0, | |
592 | MAPLE_FUNC_MEMCARD); | |
593 | kfree(part_cur->name); | |
594 | fail_name: | |
595 | return; | |
596 | } | |
597 | ||
598 | /* Handles very basic info about the flash, queries for details */ | |
599 | static int __devinit vmu_connect(struct maple_device *mdev) | |
600 | { | |
601 | unsigned long test_flash_data, basic_flash_data; | |
602 | int c, error; | |
603 | struct memcard *card; | |
604 | u32 partnum = 0; | |
605 | ||
606 | test_flash_data = be32_to_cpu(mdev->devinfo.function); | |
607 | /* Need to count how many bits are set - to find out which | |
782e5711 AM |
608 | * function_data element has details of the memory card |
609 | */ | |
610 | c = hweight_long(test_flash_data); | |
47a72688 AM |
611 | |
612 | basic_flash_data = be32_to_cpu(mdev->devinfo.function_data[c - 1]); | |
613 | ||
614 | card = kmalloc(sizeof(struct memcard), GFP_KERNEL); | |
615 | if (!card) { | |
895fb494 | 616 | error = -ENOMEM; |
47a72688 AM |
617 | goto fail_nomem; |
618 | } | |
619 | ||
620 | card->partitions = (basic_flash_data >> 24 & 0xFF) + 1; | |
621 | card->blocklen = ((basic_flash_data >> 16 & 0xFF) + 1) << 5; | |
622 | card->writecnt = basic_flash_data >> 12 & 0xF; | |
623 | card->readcnt = basic_flash_data >> 8 & 0xF; | |
624 | card->removeable = basic_flash_data >> 7 & 1; | |
625 | ||
626 | card->partition = 0; | |
627 | ||
628 | /* | |
629 | * Not sure there are actually any multi-partition devices in the | |
630 | * real world, but the hardware supports them, so, so will we | |
631 | */ | |
632 | card->parts = kmalloc(sizeof(struct vmupart) * card->partitions, | |
633 | GFP_KERNEL); | |
634 | if (!card->parts) { | |
635 | error = -ENOMEM; | |
636 | goto fail_partitions; | |
637 | } | |
638 | ||
639 | card->mtd = kmalloc(sizeof(struct mtd_info) * card->partitions, | |
640 | GFP_KERNEL); | |
641 | if (!card->mtd) { | |
642 | error = -ENOMEM; | |
643 | goto fail_mtd_info; | |
644 | } | |
645 | ||
646 | maple_set_drvdata(mdev, card); | |
647 | ||
648 | /* | |
649 | * We want to trap meminfo not get cond | |
650 | * so set interval to zero, but rely on maple bus | |
651 | * driver to pass back the results of the meminfo | |
652 | */ | |
653 | maple_getcond_callback(mdev, vmu_queryblocks, 0, | |
654 | MAPLE_FUNC_MEMCARD); | |
655 | ||
656 | /* Make sure we are clear to go */ | |
657 | if (atomic_read(&mdev->busy) == 1) { | |
658 | wait_event_interruptible_timeout(mdev->maple_wait, | |
659 | atomic_read(&mdev->busy) == 0, HZ); | |
660 | if (atomic_read(&mdev->busy) == 1) { | |
661 | dev_notice(&mdev->dev, "VMU at (%d, %d) is busy\n", | |
662 | mdev->port, mdev->unit); | |
663 | error = -EAGAIN; | |
664 | goto fail_device_busy; | |
665 | } | |
666 | } | |
667 | ||
668 | atomic_set(&mdev->busy, 1); | |
669 | ||
670 | /* | |
671 | * Set up the minfo call: vmu_queryblocks will handle | |
672 | * the information passed back | |
673 | */ | |
674 | error = maple_add_packet(mdev, MAPLE_FUNC_MEMCARD, | |
675 | MAPLE_COMMAND_GETMINFO, 2, &partnum); | |
676 | if (error) { | |
677 | dev_err(&mdev->dev, "Could not lock VMU at (%d, %d)" | |
678 | " error is 0x%X\n", mdev->port, mdev->unit, error); | |
679 | goto fail_mtd_info; | |
680 | } | |
681 | return 0; | |
682 | ||
683 | fail_device_busy: | |
684 | kfree(card->mtd); | |
685 | fail_mtd_info: | |
686 | kfree(card->parts); | |
687 | fail_partitions: | |
688 | kfree(card); | |
689 | fail_nomem: | |
690 | return error; | |
691 | } | |
692 | ||
693 | static void __devexit vmu_disconnect(struct maple_device *mdev) | |
694 | { | |
695 | struct memcard *card; | |
696 | struct mdev_part *mpart; | |
697 | int x; | |
698 | ||
699 | mdev->callback = NULL; | |
700 | card = maple_get_drvdata(mdev); | |
701 | for (x = 0; x < card->partitions; x++) { | |
702 | mpart = ((card->mtd)[x]).priv; | |
703 | mpart->mdev = NULL; | |
ee0e87b1 | 704 | mtd_device_unregister(&((card->mtd)[x])); |
47a72688 AM |
705 | kfree(((card->parts)[x]).name); |
706 | } | |
707 | kfree(card->parts); | |
708 | kfree(card->mtd); | |
709 | kfree(card); | |
710 | } | |
711 | ||
712 | /* Callback to handle eccentricities of both mtd subsystem | |
713 | * and general flakyness of Dreamcast VMUs | |
714 | */ | |
715 | static int vmu_can_unload(struct maple_device *mdev) | |
716 | { | |
717 | struct memcard *card; | |
718 | int x; | |
719 | struct mtd_info *mtd; | |
720 | ||
721 | card = maple_get_drvdata(mdev); | |
722 | for (x = 0; x < card->partitions; x++) { | |
723 | mtd = &((card->mtd)[x]); | |
724 | if (mtd->usecount > 0) | |
725 | return 0; | |
726 | } | |
727 | return 1; | |
728 | } | |
729 | ||
730 | #define ERRSTR "VMU at (%d, %d) file error -" | |
731 | ||
732 | static void vmu_file_error(struct maple_device *mdev, void *recvbuf) | |
733 | { | |
734 | enum maple_file_errors error = ((int *)recvbuf)[1]; | |
735 | ||
736 | switch (error) { | |
737 | ||
738 | case MAPLE_FILEERR_INVALID_PARTITION: | |
739 | dev_notice(&mdev->dev, ERRSTR " invalid partition number\n", | |
740 | mdev->port, mdev->unit); | |
741 | break; | |
742 | ||
743 | case MAPLE_FILEERR_PHASE_ERROR: | |
744 | dev_notice(&mdev->dev, ERRSTR " phase error\n", | |
745 | mdev->port, mdev->unit); | |
746 | break; | |
747 | ||
748 | case MAPLE_FILEERR_INVALID_BLOCK: | |
749 | dev_notice(&mdev->dev, ERRSTR " invalid block number\n", | |
750 | mdev->port, mdev->unit); | |
751 | break; | |
752 | ||
753 | case MAPLE_FILEERR_WRITE_ERROR: | |
754 | dev_notice(&mdev->dev, ERRSTR " write error\n", | |
755 | mdev->port, mdev->unit); | |
756 | break; | |
757 | ||
758 | case MAPLE_FILEERR_INVALID_WRITE_LENGTH: | |
759 | dev_notice(&mdev->dev, ERRSTR " invalid write length\n", | |
760 | mdev->port, mdev->unit); | |
761 | break; | |
762 | ||
763 | case MAPLE_FILEERR_BAD_CRC: | |
764 | dev_notice(&mdev->dev, ERRSTR " bad CRC\n", | |
765 | mdev->port, mdev->unit); | |
766 | break; | |
767 | ||
768 | default: | |
769 | dev_notice(&mdev->dev, ERRSTR " 0x%X\n", | |
770 | mdev->port, mdev->unit, error); | |
771 | } | |
772 | } | |
773 | ||
774 | ||
775 | static int __devinit probe_maple_vmu(struct device *dev) | |
776 | { | |
777 | int error; | |
778 | struct maple_device *mdev = to_maple_dev(dev); | |
779 | struct maple_driver *mdrv = to_maple_driver(dev->driver); | |
780 | ||
781 | mdev->can_unload = vmu_can_unload; | |
782 | mdev->fileerr_handler = vmu_file_error; | |
783 | mdev->driver = mdrv; | |
784 | ||
785 | error = vmu_connect(mdev); | |
786 | if (error) | |
787 | return error; | |
788 | ||
789 | return 0; | |
790 | } | |
791 | ||
792 | static int __devexit remove_maple_vmu(struct device *dev) | |
793 | { | |
794 | struct maple_device *mdev = to_maple_dev(dev); | |
795 | ||
796 | vmu_disconnect(mdev); | |
797 | return 0; | |
798 | } | |
799 | ||
800 | static struct maple_driver vmu_flash_driver = { | |
801 | .function = MAPLE_FUNC_MEMCARD, | |
802 | .drv = { | |
803 | .name = "Dreamcast_visual_memory", | |
804 | .probe = probe_maple_vmu, | |
805 | .remove = __devexit_p(remove_maple_vmu), | |
806 | }, | |
807 | }; | |
808 | ||
809 | static int __init vmu_flash_map_init(void) | |
810 | { | |
811 | return maple_driver_register(&vmu_flash_driver); | |
812 | } | |
813 | ||
814 | static void __exit vmu_flash_map_exit(void) | |
815 | { | |
816 | maple_driver_unregister(&vmu_flash_driver); | |
817 | } | |
818 | ||
819 | module_init(vmu_flash_map_init); | |
820 | module_exit(vmu_flash_map_exit); | |
821 | ||
822 | MODULE_LICENSE("GPL"); | |
823 | MODULE_AUTHOR("Adrian McMenamin"); | |
824 | MODULE_DESCRIPTION("Flash mapping for Sega Dreamcast visual memory"); |