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957ec138 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
47a72688 AM |
2 | /* vmu-flash.c |
3 | * Driver for SEGA Dreamcast Visual Memory Unit | |
4 | * | |
5 | * Copyright (c) Adrian McMenamin 2002 - 2009 | |
6 | * Copyright (c) Paul Mundt 2001 | |
47a72688 AM |
7 | */ |
8 | #include <linux/init.h> | |
5a0e3ad6 | 9 | #include <linux/slab.h> |
47a72688 AM |
10 | #include <linux/sched.h> |
11 | #include <linux/delay.h> | |
12 | #include <linux/maple.h> | |
13 | #include <linux/mtd/mtd.h> | |
14 | #include <linux/mtd/map.h> | |
15 | ||
16 | struct vmu_cache { | |
17 | unsigned char *buffer; /* Cache */ | |
18 | unsigned int block; /* Which block was cached */ | |
19 | unsigned long jiffies_atc; /* When was it cached? */ | |
20 | int valid; | |
21 | }; | |
22 | ||
23 | struct mdev_part { | |
24 | struct maple_device *mdev; | |
25 | int partition; | |
26 | }; | |
27 | ||
28 | struct vmupart { | |
29 | u16 user_blocks; | |
30 | u16 root_block; | |
31 | u16 numblocks; | |
32 | char *name; | |
33 | struct vmu_cache *pcache; | |
34 | }; | |
35 | ||
36 | struct memcard { | |
37 | u16 tempA; | |
38 | u16 tempB; | |
39 | u32 partitions; | |
40 | u32 blocklen; | |
41 | u32 writecnt; | |
42 | u32 readcnt; | |
0626258a | 43 | u32 removable; |
47a72688 AM |
44 | int partition; |
45 | int read; | |
46 | unsigned char *blockread; | |
47 | struct vmupart *parts; | |
48 | struct mtd_info *mtd; | |
49 | }; | |
50 | ||
51 | struct vmu_block { | |
52 | unsigned int num; /* block number */ | |
53 | unsigned int ofs; /* block offset */ | |
54 | }; | |
55 | ||
56 | static struct vmu_block *ofs_to_block(unsigned long src_ofs, | |
57 | struct mtd_info *mtd, int partition) | |
58 | { | |
59 | struct vmu_block *vblock; | |
60 | struct maple_device *mdev; | |
61 | struct memcard *card; | |
62 | struct mdev_part *mpart; | |
63 | int num; | |
64 | ||
65 | mpart = mtd->priv; | |
66 | mdev = mpart->mdev; | |
67 | card = maple_get_drvdata(mdev); | |
68 | ||
69 | if (src_ofs >= card->parts[partition].numblocks * card->blocklen) | |
70 | goto failed; | |
71 | ||
72 | num = src_ofs / card->blocklen; | |
73 | if (num > card->parts[partition].numblocks) | |
74 | goto failed; | |
75 | ||
76 | vblock = kmalloc(sizeof(struct vmu_block), GFP_KERNEL); | |
77 | if (!vblock) | |
78 | goto failed; | |
79 | ||
80 | vblock->num = num; | |
81 | vblock->ofs = src_ofs % card->blocklen; | |
82 | return vblock; | |
83 | ||
84 | failed: | |
85 | return NULL; | |
86 | } | |
87 | ||
88 | /* Maple bus callback function for reads */ | |
89 | static void vmu_blockread(struct mapleq *mq) | |
90 | { | |
91 | struct maple_device *mdev; | |
92 | struct memcard *card; | |
93 | ||
94 | mdev = mq->dev; | |
95 | card = maple_get_drvdata(mdev); | |
96 | /* copy the read in data */ | |
97 | ||
98 | if (unlikely(!card->blockread)) | |
99 | return; | |
100 | ||
101 | memcpy(card->blockread, mq->recvbuf->buf + 12, | |
102 | card->blocklen/card->readcnt); | |
103 | ||
104 | } | |
105 | ||
106 | /* Interface with maple bus to read blocks | |
107 | * caching the results so that other parts | |
108 | * of the driver can access block reads */ | |
109 | static int maple_vmu_read_block(unsigned int num, unsigned char *buf, | |
110 | struct mtd_info *mtd) | |
111 | { | |
112 | struct memcard *card; | |
113 | struct mdev_part *mpart; | |
114 | struct maple_device *mdev; | |
115 | int partition, error = 0, x, wait; | |
116 | unsigned char *blockread = NULL; | |
117 | struct vmu_cache *pcache; | |
118 | __be32 sendbuf; | |
119 | ||
120 | mpart = mtd->priv; | |
121 | mdev = mpart->mdev; | |
122 | partition = mpart->partition; | |
123 | card = maple_get_drvdata(mdev); | |
124 | pcache = card->parts[partition].pcache; | |
125 | pcache->valid = 0; | |
126 | ||
127 | /* prepare the cache for this block */ | |
128 | if (!pcache->buffer) { | |
129 | pcache->buffer = kmalloc(card->blocklen, GFP_KERNEL); | |
130 | if (!pcache->buffer) { | |
131 | dev_err(&mdev->dev, "VMU at (%d, %d) - read fails due" | |
132 | " to lack of memory\n", mdev->port, | |
133 | mdev->unit); | |
134 | error = -ENOMEM; | |
135 | goto outB; | |
136 | } | |
137 | } | |
138 | ||
139 | /* | |
140 | * Reads may be phased - again the hardware spec | |
141 | * supports this - though may not be any devices in | |
142 | * the wild that implement it, but we will here | |
143 | */ | |
144 | for (x = 0; x < card->readcnt; x++) { | |
145 | sendbuf = cpu_to_be32(partition << 24 | x << 16 | num); | |
146 | ||
147 | if (atomic_read(&mdev->busy) == 1) { | |
148 | wait_event_interruptible_timeout(mdev->maple_wait, | |
149 | atomic_read(&mdev->busy) == 0, HZ); | |
150 | if (atomic_read(&mdev->busy) == 1) { | |
151 | dev_notice(&mdev->dev, "VMU at (%d, %d)" | |
152 | " is busy\n", mdev->port, mdev->unit); | |
153 | error = -EAGAIN; | |
154 | goto outB; | |
155 | } | |
156 | } | |
157 | ||
158 | atomic_set(&mdev->busy, 1); | |
159 | blockread = kmalloc(card->blocklen/card->readcnt, GFP_KERNEL); | |
160 | if (!blockread) { | |
161 | error = -ENOMEM; | |
162 | atomic_set(&mdev->busy, 0); | |
163 | goto outB; | |
164 | } | |
165 | card->blockread = blockread; | |
166 | ||
167 | maple_getcond_callback(mdev, vmu_blockread, 0, | |
168 | MAPLE_FUNC_MEMCARD); | |
169 | error = maple_add_packet(mdev, MAPLE_FUNC_MEMCARD, | |
170 | MAPLE_COMMAND_BREAD, 2, &sendbuf); | |
171 | /* Very long timeouts seem to be needed when box is stressed */ | |
172 | wait = wait_event_interruptible_timeout(mdev->maple_wait, | |
173 | (atomic_read(&mdev->busy) == 0 || | |
174 | atomic_read(&mdev->busy) == 2), HZ * 3); | |
175 | /* | |
176 | * MTD layer does not handle hotplugging well | |
177 | * so have to return errors when VMU is unplugged | |
178 | * in the middle of a read (busy == 2) | |
179 | */ | |
180 | if (error || atomic_read(&mdev->busy) == 2) { | |
181 | if (atomic_read(&mdev->busy) == 2) | |
182 | error = -ENXIO; | |
183 | atomic_set(&mdev->busy, 0); | |
184 | card->blockread = NULL; | |
185 | goto outA; | |
186 | } | |
187 | if (wait == 0 || wait == -ERESTARTSYS) { | |
188 | card->blockread = NULL; | |
189 | atomic_set(&mdev->busy, 0); | |
190 | error = -EIO; | |
191 | list_del_init(&(mdev->mq->list)); | |
192 | kfree(mdev->mq->sendbuf); | |
193 | mdev->mq->sendbuf = NULL; | |
194 | if (wait == -ERESTARTSYS) { | |
195 | dev_warn(&mdev->dev, "VMU read on (%d, %d)" | |
196 | " interrupted on block 0x%X\n", | |
197 | mdev->port, mdev->unit, num); | |
198 | } else | |
199 | dev_notice(&mdev->dev, "VMU read on (%d, %d)" | |
200 | " timed out on block 0x%X\n", | |
201 | mdev->port, mdev->unit, num); | |
202 | goto outA; | |
203 | } | |
204 | ||
205 | memcpy(buf + (card->blocklen/card->readcnt) * x, blockread, | |
206 | card->blocklen/card->readcnt); | |
207 | ||
208 | memcpy(pcache->buffer + (card->blocklen/card->readcnt) * x, | |
209 | card->blockread, card->blocklen/card->readcnt); | |
210 | card->blockread = NULL; | |
211 | pcache->block = num; | |
212 | pcache->jiffies_atc = jiffies; | |
213 | pcache->valid = 1; | |
214 | kfree(blockread); | |
215 | } | |
216 | ||
217 | return error; | |
218 | ||
219 | outA: | |
220 | kfree(blockread); | |
221 | outB: | |
222 | return error; | |
223 | } | |
224 | ||
225 | /* communicate with maple bus for phased writing */ | |
226 | static int maple_vmu_write_block(unsigned int num, const unsigned char *buf, | |
227 | struct mtd_info *mtd) | |
228 | { | |
229 | struct memcard *card; | |
230 | struct mdev_part *mpart; | |
231 | struct maple_device *mdev; | |
232 | int partition, error, locking, x, phaselen, wait; | |
233 | __be32 *sendbuf; | |
234 | ||
235 | mpart = mtd->priv; | |
236 | mdev = mpart->mdev; | |
237 | partition = mpart->partition; | |
238 | card = maple_get_drvdata(mdev); | |
239 | ||
240 | phaselen = card->blocklen/card->writecnt; | |
241 | ||
242 | sendbuf = kmalloc(phaselen + 4, GFP_KERNEL); | |
243 | if (!sendbuf) { | |
244 | error = -ENOMEM; | |
245 | goto fail_nosendbuf; | |
246 | } | |
247 | for (x = 0; x < card->writecnt; x++) { | |
248 | sendbuf[0] = cpu_to_be32(partition << 24 | x << 16 | num); | |
249 | memcpy(&sendbuf[1], buf + phaselen * x, phaselen); | |
250 | /* wait until the device is not busy doing something else | |
251 | * or 1 second - which ever is longer */ | |
252 | if (atomic_read(&mdev->busy) == 1) { | |
253 | wait_event_interruptible_timeout(mdev->maple_wait, | |
254 | atomic_read(&mdev->busy) == 0, HZ); | |
255 | if (atomic_read(&mdev->busy) == 1) { | |
256 | error = -EBUSY; | |
257 | dev_notice(&mdev->dev, "VMU write at (%d, %d)" | |
258 | "failed - device is busy\n", | |
259 | mdev->port, mdev->unit); | |
260 | goto fail_nolock; | |
261 | } | |
262 | } | |
263 | atomic_set(&mdev->busy, 1); | |
264 | ||
265 | locking = maple_add_packet(mdev, MAPLE_FUNC_MEMCARD, | |
266 | MAPLE_COMMAND_BWRITE, phaselen / 4 + 2, sendbuf); | |
267 | wait = wait_event_interruptible_timeout(mdev->maple_wait, | |
268 | atomic_read(&mdev->busy) == 0, HZ/10); | |
269 | if (locking) { | |
270 | error = -EIO; | |
271 | atomic_set(&mdev->busy, 0); | |
272 | goto fail_nolock; | |
273 | } | |
274 | if (atomic_read(&mdev->busy) == 2) { | |
275 | atomic_set(&mdev->busy, 0); | |
276 | } else if (wait == 0 || wait == -ERESTARTSYS) { | |
277 | error = -EIO; | |
278 | dev_warn(&mdev->dev, "Write at (%d, %d) of block" | |
279 | " 0x%X at phase %d failed: could not" | |
280 | " communicate with VMU", mdev->port, | |
281 | mdev->unit, num, x); | |
282 | atomic_set(&mdev->busy, 0); | |
283 | kfree(mdev->mq->sendbuf); | |
284 | mdev->mq->sendbuf = NULL; | |
285 | list_del_init(&(mdev->mq->list)); | |
286 | goto fail_nolock; | |
287 | } | |
288 | } | |
289 | kfree(sendbuf); | |
290 | ||
291 | return card->blocklen; | |
292 | ||
293 | fail_nolock: | |
294 | kfree(sendbuf); | |
295 | fail_nosendbuf: | |
296 | dev_err(&mdev->dev, "VMU (%d, %d): write failed\n", mdev->port, | |
297 | mdev->unit); | |
298 | return error; | |
299 | } | |
300 | ||
301 | /* mtd function to simulate reading byte by byte */ | |
302 | static unsigned char vmu_flash_read_char(unsigned long ofs, int *retval, | |
303 | struct mtd_info *mtd) | |
304 | { | |
305 | struct vmu_block *vblock; | |
306 | struct memcard *card; | |
307 | struct mdev_part *mpart; | |
308 | struct maple_device *mdev; | |
309 | unsigned char *buf, ret; | |
310 | int partition, error; | |
311 | ||
312 | mpart = mtd->priv; | |
313 | mdev = mpart->mdev; | |
314 | partition = mpart->partition; | |
315 | card = maple_get_drvdata(mdev); | |
316 | *retval = 0; | |
317 | ||
318 | buf = kmalloc(card->blocklen, GFP_KERNEL); | |
319 | if (!buf) { | |
320 | *retval = 1; | |
321 | ret = -ENOMEM; | |
322 | goto finish; | |
323 | } | |
324 | ||
325 | vblock = ofs_to_block(ofs, mtd, partition); | |
326 | if (!vblock) { | |
327 | *retval = 3; | |
328 | ret = -ENOMEM; | |
329 | goto out_buf; | |
330 | } | |
331 | ||
332 | error = maple_vmu_read_block(vblock->num, buf, mtd); | |
333 | if (error) { | |
334 | ret = error; | |
335 | *retval = 2; | |
336 | goto out_vblock; | |
337 | } | |
338 | ||
339 | ret = buf[vblock->ofs]; | |
340 | ||
341 | out_vblock: | |
342 | kfree(vblock); | |
343 | out_buf: | |
344 | kfree(buf); | |
345 | finish: | |
346 | return ret; | |
347 | } | |
348 | ||
349 | /* mtd higher order function to read flash */ | |
350 | static int vmu_flash_read(struct mtd_info *mtd, loff_t from, size_t len, | |
351 | size_t *retlen, u_char *buf) | |
352 | { | |
353 | struct maple_device *mdev; | |
354 | struct memcard *card; | |
355 | struct mdev_part *mpart; | |
356 | struct vmu_cache *pcache; | |
357 | struct vmu_block *vblock; | |
358 | int index = 0, retval, partition, leftover, numblocks; | |
359 | unsigned char cx; | |
360 | ||
47a72688 AM |
361 | mpart = mtd->priv; |
362 | mdev = mpart->mdev; | |
363 | partition = mpart->partition; | |
364 | card = maple_get_drvdata(mdev); | |
365 | ||
366 | numblocks = card->parts[partition].numblocks; | |
367 | if (from + len > numblocks * card->blocklen) | |
368 | len = numblocks * card->blocklen - from; | |
369 | if (len == 0) | |
370 | return -EIO; | |
371 | /* Have we cached this bit already? */ | |
372 | pcache = card->parts[partition].pcache; | |
373 | do { | |
374 | vblock = ofs_to_block(from + index, mtd, partition); | |
375 | if (!vblock) | |
376 | return -ENOMEM; | |
377 | /* Have we cached this and is the cache valid and timely? */ | |
378 | if (pcache->valid && | |
379 | time_before(jiffies, pcache->jiffies_atc + HZ) && | |
380 | (pcache->block == vblock->num)) { | |
381 | /* we have cached it, so do necessary copying */ | |
382 | leftover = card->blocklen - vblock->ofs; | |
383 | if (vblock->ofs + len - index < card->blocklen) { | |
384 | /* only a bit of this block to copy */ | |
385 | memcpy(buf + index, | |
386 | pcache->buffer + vblock->ofs, | |
387 | len - index); | |
388 | index = len; | |
389 | } else { | |
390 | /* otherwise copy remainder of whole block */ | |
391 | memcpy(buf + index, pcache->buffer + | |
392 | vblock->ofs, leftover); | |
393 | index += leftover; | |
394 | } | |
395 | } else { | |
396 | /* | |
397 | * Not cached so read one byte - | |
398 | * but cache the rest of the block | |
399 | */ | |
400 | cx = vmu_flash_read_char(from + index, &retval, mtd); | |
401 | if (retval) { | |
402 | *retlen = index; | |
403 | kfree(vblock); | |
404 | return cx; | |
405 | } | |
406 | memset(buf + index, cx, 1); | |
407 | index++; | |
408 | } | |
409 | kfree(vblock); | |
410 | } while (len > index); | |
411 | *retlen = index; | |
412 | ||
413 | return 0; | |
414 | } | |
415 | ||
416 | static int vmu_flash_write(struct mtd_info *mtd, loff_t to, size_t len, | |
417 | size_t *retlen, const u_char *buf) | |
418 | { | |
419 | struct maple_device *mdev; | |
420 | struct memcard *card; | |
421 | struct mdev_part *mpart; | |
422 | int index = 0, partition, error = 0, numblocks; | |
423 | struct vmu_cache *pcache; | |
424 | struct vmu_block *vblock; | |
425 | unsigned char *buffer; | |
426 | ||
427 | mpart = mtd->priv; | |
428 | mdev = mpart->mdev; | |
429 | partition = mpart->partition; | |
430 | card = maple_get_drvdata(mdev); | |
431 | ||
47a72688 AM |
432 | numblocks = card->parts[partition].numblocks; |
433 | if (to + len > numblocks * card->blocklen) | |
434 | len = numblocks * card->blocklen - to; | |
435 | if (len == 0) { | |
436 | error = -EIO; | |
437 | goto failed; | |
438 | } | |
439 | ||
440 | vblock = ofs_to_block(to, mtd, partition); | |
441 | if (!vblock) { | |
442 | error = -ENOMEM; | |
443 | goto failed; | |
444 | } | |
445 | ||
446 | buffer = kmalloc(card->blocklen, GFP_KERNEL); | |
447 | if (!buffer) { | |
448 | error = -ENOMEM; | |
449 | goto fail_buffer; | |
450 | } | |
451 | ||
452 | do { | |
453 | /* Read in the block we are to write to */ | |
454 | error = maple_vmu_read_block(vblock->num, buffer, mtd); | |
455 | if (error) | |
456 | goto fail_io; | |
457 | ||
458 | do { | |
459 | buffer[vblock->ofs] = buf[index]; | |
460 | vblock->ofs++; | |
461 | index++; | |
462 | if (index >= len) | |
463 | break; | |
464 | } while (vblock->ofs < card->blocklen); | |
465 | ||
466 | /* write out new buffer */ | |
467 | error = maple_vmu_write_block(vblock->num, buffer, mtd); | |
468 | /* invalidate the cache */ | |
469 | pcache = card->parts[partition].pcache; | |
470 | pcache->valid = 0; | |
471 | ||
472 | if (error != card->blocklen) | |
473 | goto fail_io; | |
474 | ||
475 | vblock->num++; | |
476 | vblock->ofs = 0; | |
477 | } while (len > index); | |
478 | ||
479 | kfree(buffer); | |
480 | *retlen = index; | |
481 | kfree(vblock); | |
482 | return 0; | |
483 | ||
484 | fail_io: | |
485 | kfree(buffer); | |
486 | fail_buffer: | |
487 | kfree(vblock); | |
488 | failed: | |
489 | dev_err(&mdev->dev, "VMU write failing with error %d\n", error); | |
490 | return error; | |
491 | } | |
492 | ||
493 | static void vmu_flash_sync(struct mtd_info *mtd) | |
494 | { | |
495 | /* Do nothing here */ | |
496 | } | |
497 | ||
498 | /* Maple bus callback function to recursively query hardware details */ | |
499 | static void vmu_queryblocks(struct mapleq *mq) | |
500 | { | |
501 | struct maple_device *mdev; | |
502 | unsigned short *res; | |
503 | struct memcard *card; | |
504 | __be32 partnum; | |
505 | struct vmu_cache *pcache; | |
506 | struct mdev_part *mpart; | |
507 | struct mtd_info *mtd_cur; | |
508 | struct vmupart *part_cur; | |
509 | int error; | |
510 | ||
511 | mdev = mq->dev; | |
512 | card = maple_get_drvdata(mdev); | |
513 | res = (unsigned short *) (mq->recvbuf->buf); | |
514 | card->tempA = res[12]; | |
515 | card->tempB = res[6]; | |
516 | ||
517 | dev_info(&mdev->dev, "VMU device at partition %d has %d user " | |
518 | "blocks with a root block at %d\n", card->partition, | |
519 | card->tempA, card->tempB); | |
520 | ||
521 | part_cur = &card->parts[card->partition]; | |
522 | part_cur->user_blocks = card->tempA; | |
523 | part_cur->root_block = card->tempB; | |
524 | part_cur->numblocks = card->tempB + 1; | |
525 | part_cur->name = kmalloc(12, GFP_KERNEL); | |
526 | if (!part_cur->name) | |
527 | goto fail_name; | |
528 | ||
529 | sprintf(part_cur->name, "vmu%d.%d.%d", | |
530 | mdev->port, mdev->unit, card->partition); | |
531 | mtd_cur = &card->mtd[card->partition]; | |
532 | mtd_cur->name = part_cur->name; | |
533 | mtd_cur->type = 8; | |
534 | mtd_cur->flags = MTD_WRITEABLE|MTD_NO_ERASE; | |
535 | mtd_cur->size = part_cur->numblocks * card->blocklen; | |
536 | mtd_cur->erasesize = card->blocklen; | |
3c3c10bb AB |
537 | mtd_cur->_write = vmu_flash_write; |
538 | mtd_cur->_read = vmu_flash_read; | |
539 | mtd_cur->_sync = vmu_flash_sync; | |
47a72688 AM |
540 | mtd_cur->writesize = card->blocklen; |
541 | ||
542 | mpart = kmalloc(sizeof(struct mdev_part), GFP_KERNEL); | |
543 | if (!mpart) | |
544 | goto fail_mpart; | |
545 | ||
546 | mpart->mdev = mdev; | |
547 | mpart->partition = card->partition; | |
548 | mtd_cur->priv = mpart; | |
549 | mtd_cur->owner = THIS_MODULE; | |
550 | ||
551 | pcache = kzalloc(sizeof(struct vmu_cache), GFP_KERNEL); | |
552 | if (!pcache) | |
553 | goto fail_cache_create; | |
554 | part_cur->pcache = pcache; | |
555 | ||
ee0e87b1 | 556 | error = mtd_device_register(mtd_cur, NULL, 0); |
47a72688 AM |
557 | if (error) |
558 | goto fail_mtd_register; | |
559 | ||
560 | maple_getcond_callback(mdev, NULL, 0, | |
561 | MAPLE_FUNC_MEMCARD); | |
562 | ||
563 | /* | |
564 | * Set up a recursive call to the (probably theoretical) | |
565 | * second or more partition | |
566 | */ | |
567 | if (++card->partition < card->partitions) { | |
568 | partnum = cpu_to_be32(card->partition << 24); | |
569 | maple_getcond_callback(mdev, vmu_queryblocks, 0, | |
570 | MAPLE_FUNC_MEMCARD); | |
571 | maple_add_packet(mdev, MAPLE_FUNC_MEMCARD, | |
572 | MAPLE_COMMAND_GETMINFO, 2, &partnum); | |
573 | } | |
574 | return; | |
575 | ||
576 | fail_mtd_register: | |
577 | dev_err(&mdev->dev, "Could not register maple device at (%d, %d)" | |
578 | "error is 0x%X\n", mdev->port, mdev->unit, error); | |
579 | for (error = 0; error <= card->partition; error++) { | |
580 | kfree(((card->parts)[error]).pcache); | |
581 | ((card->parts)[error]).pcache = NULL; | |
582 | } | |
583 | fail_cache_create: | |
584 | fail_mpart: | |
585 | for (error = 0; error <= card->partition; error++) { | |
586 | kfree(((card->mtd)[error]).priv); | |
587 | ((card->mtd)[error]).priv = NULL; | |
588 | } | |
589 | maple_getcond_callback(mdev, NULL, 0, | |
590 | MAPLE_FUNC_MEMCARD); | |
591 | kfree(part_cur->name); | |
592 | fail_name: | |
593 | return; | |
594 | } | |
595 | ||
596 | /* Handles very basic info about the flash, queries for details */ | |
06f25510 | 597 | static int vmu_connect(struct maple_device *mdev) |
47a72688 AM |
598 | { |
599 | unsigned long test_flash_data, basic_flash_data; | |
600 | int c, error; | |
601 | struct memcard *card; | |
602 | u32 partnum = 0; | |
603 | ||
604 | test_flash_data = be32_to_cpu(mdev->devinfo.function); | |
605 | /* Need to count how many bits are set - to find out which | |
782e5711 AM |
606 | * function_data element has details of the memory card |
607 | */ | |
608 | c = hweight_long(test_flash_data); | |
47a72688 AM |
609 | |
610 | basic_flash_data = be32_to_cpu(mdev->devinfo.function_data[c - 1]); | |
611 | ||
612 | card = kmalloc(sizeof(struct memcard), GFP_KERNEL); | |
613 | if (!card) { | |
895fb494 | 614 | error = -ENOMEM; |
47a72688 AM |
615 | goto fail_nomem; |
616 | } | |
617 | ||
618 | card->partitions = (basic_flash_data >> 24 & 0xFF) + 1; | |
619 | card->blocklen = ((basic_flash_data >> 16 & 0xFF) + 1) << 5; | |
620 | card->writecnt = basic_flash_data >> 12 & 0xF; | |
621 | card->readcnt = basic_flash_data >> 8 & 0xF; | |
0626258a | 622 | card->removable = basic_flash_data >> 7 & 1; |
47a72688 AM |
623 | |
624 | card->partition = 0; | |
625 | ||
626 | /* | |
627 | * Not sure there are actually any multi-partition devices in the | |
628 | * real world, but the hardware supports them, so, so will we | |
629 | */ | |
6da2ec56 KC |
630 | card->parts = kmalloc_array(card->partitions, sizeof(struct vmupart), |
631 | GFP_KERNEL); | |
47a72688 AM |
632 | if (!card->parts) { |
633 | error = -ENOMEM; | |
634 | goto fail_partitions; | |
635 | } | |
636 | ||
6da2ec56 KC |
637 | card->mtd = kmalloc_array(card->partitions, sizeof(struct mtd_info), |
638 | GFP_KERNEL); | |
47a72688 AM |
639 | if (!card->mtd) { |
640 | error = -ENOMEM; | |
641 | goto fail_mtd_info; | |
642 | } | |
643 | ||
644 | maple_set_drvdata(mdev, card); | |
645 | ||
646 | /* | |
647 | * We want to trap meminfo not get cond | |
648 | * so set interval to zero, but rely on maple bus | |
649 | * driver to pass back the results of the meminfo | |
650 | */ | |
651 | maple_getcond_callback(mdev, vmu_queryblocks, 0, | |
652 | MAPLE_FUNC_MEMCARD); | |
653 | ||
654 | /* Make sure we are clear to go */ | |
655 | if (atomic_read(&mdev->busy) == 1) { | |
656 | wait_event_interruptible_timeout(mdev->maple_wait, | |
657 | atomic_read(&mdev->busy) == 0, HZ); | |
658 | if (atomic_read(&mdev->busy) == 1) { | |
659 | dev_notice(&mdev->dev, "VMU at (%d, %d) is busy\n", | |
660 | mdev->port, mdev->unit); | |
661 | error = -EAGAIN; | |
662 | goto fail_device_busy; | |
663 | } | |
664 | } | |
665 | ||
666 | atomic_set(&mdev->busy, 1); | |
667 | ||
668 | /* | |
669 | * Set up the minfo call: vmu_queryblocks will handle | |
670 | * the information passed back | |
671 | */ | |
672 | error = maple_add_packet(mdev, MAPLE_FUNC_MEMCARD, | |
673 | MAPLE_COMMAND_GETMINFO, 2, &partnum); | |
674 | if (error) { | |
675 | dev_err(&mdev->dev, "Could not lock VMU at (%d, %d)" | |
676 | " error is 0x%X\n", mdev->port, mdev->unit, error); | |
677 | goto fail_mtd_info; | |
678 | } | |
679 | return 0; | |
680 | ||
681 | fail_device_busy: | |
682 | kfree(card->mtd); | |
683 | fail_mtd_info: | |
684 | kfree(card->parts); | |
685 | fail_partitions: | |
686 | kfree(card); | |
687 | fail_nomem: | |
688 | return error; | |
689 | } | |
690 | ||
810b7e06 | 691 | static void vmu_disconnect(struct maple_device *mdev) |
47a72688 AM |
692 | { |
693 | struct memcard *card; | |
694 | struct mdev_part *mpart; | |
695 | int x; | |
696 | ||
697 | mdev->callback = NULL; | |
698 | card = maple_get_drvdata(mdev); | |
699 | for (x = 0; x < card->partitions; x++) { | |
700 | mpart = ((card->mtd)[x]).priv; | |
701 | mpart->mdev = NULL; | |
ee0e87b1 | 702 | mtd_device_unregister(&((card->mtd)[x])); |
47a72688 AM |
703 | kfree(((card->parts)[x]).name); |
704 | } | |
705 | kfree(card->parts); | |
706 | kfree(card->mtd); | |
707 | kfree(card); | |
708 | } | |
709 | ||
710 | /* Callback to handle eccentricities of both mtd subsystem | |
711 | * and general flakyness of Dreamcast VMUs | |
712 | */ | |
713 | static int vmu_can_unload(struct maple_device *mdev) | |
714 | { | |
715 | struct memcard *card; | |
716 | int x; | |
717 | struct mtd_info *mtd; | |
718 | ||
719 | card = maple_get_drvdata(mdev); | |
720 | for (x = 0; x < card->partitions; x++) { | |
721 | mtd = &((card->mtd)[x]); | |
722 | if (mtd->usecount > 0) | |
723 | return 0; | |
724 | } | |
725 | return 1; | |
726 | } | |
727 | ||
728 | #define ERRSTR "VMU at (%d, %d) file error -" | |
729 | ||
730 | static void vmu_file_error(struct maple_device *mdev, void *recvbuf) | |
731 | { | |
732 | enum maple_file_errors error = ((int *)recvbuf)[1]; | |
733 | ||
734 | switch (error) { | |
735 | ||
736 | case MAPLE_FILEERR_INVALID_PARTITION: | |
737 | dev_notice(&mdev->dev, ERRSTR " invalid partition number\n", | |
738 | mdev->port, mdev->unit); | |
739 | break; | |
740 | ||
741 | case MAPLE_FILEERR_PHASE_ERROR: | |
742 | dev_notice(&mdev->dev, ERRSTR " phase error\n", | |
743 | mdev->port, mdev->unit); | |
744 | break; | |
745 | ||
746 | case MAPLE_FILEERR_INVALID_BLOCK: | |
747 | dev_notice(&mdev->dev, ERRSTR " invalid block number\n", | |
748 | mdev->port, mdev->unit); | |
749 | break; | |
750 | ||
751 | case MAPLE_FILEERR_WRITE_ERROR: | |
752 | dev_notice(&mdev->dev, ERRSTR " write error\n", | |
753 | mdev->port, mdev->unit); | |
754 | break; | |
755 | ||
756 | case MAPLE_FILEERR_INVALID_WRITE_LENGTH: | |
757 | dev_notice(&mdev->dev, ERRSTR " invalid write length\n", | |
758 | mdev->port, mdev->unit); | |
759 | break; | |
760 | ||
761 | case MAPLE_FILEERR_BAD_CRC: | |
762 | dev_notice(&mdev->dev, ERRSTR " bad CRC\n", | |
763 | mdev->port, mdev->unit); | |
764 | break; | |
765 | ||
766 | default: | |
767 | dev_notice(&mdev->dev, ERRSTR " 0x%X\n", | |
768 | mdev->port, mdev->unit, error); | |
769 | } | |
770 | } | |
771 | ||
772 | ||
06f25510 | 773 | static int probe_maple_vmu(struct device *dev) |
47a72688 | 774 | { |
47a72688 AM |
775 | struct maple_device *mdev = to_maple_dev(dev); |
776 | struct maple_driver *mdrv = to_maple_driver(dev->driver); | |
777 | ||
778 | mdev->can_unload = vmu_can_unload; | |
779 | mdev->fileerr_handler = vmu_file_error; | |
780 | mdev->driver = mdrv; | |
781 | ||
6aec345e | 782 | return vmu_connect(mdev); |
47a72688 AM |
783 | } |
784 | ||
810b7e06 | 785 | static int remove_maple_vmu(struct device *dev) |
47a72688 AM |
786 | { |
787 | struct maple_device *mdev = to_maple_dev(dev); | |
788 | ||
789 | vmu_disconnect(mdev); | |
790 | return 0; | |
791 | } | |
792 | ||
793 | static struct maple_driver vmu_flash_driver = { | |
794 | .function = MAPLE_FUNC_MEMCARD, | |
795 | .drv = { | |
796 | .name = "Dreamcast_visual_memory", | |
797 | .probe = probe_maple_vmu, | |
5153b88c | 798 | .remove = remove_maple_vmu, |
47a72688 AM |
799 | }, |
800 | }; | |
801 | ||
802 | static int __init vmu_flash_map_init(void) | |
803 | { | |
804 | return maple_driver_register(&vmu_flash_driver); | |
805 | } | |
806 | ||
807 | static void __exit vmu_flash_map_exit(void) | |
808 | { | |
809 | maple_driver_unregister(&vmu_flash_driver); | |
810 | } | |
811 | ||
812 | module_init(vmu_flash_map_init); | |
813 | module_exit(vmu_flash_map_exit); | |
814 | ||
815 | MODULE_LICENSE("GPL"); | |
816 | MODULE_AUTHOR("Adrian McMenamin"); | |
817 | MODULE_DESCRIPTION("Flash mapping for Sega Dreamcast visual memory"); |