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f9652635 GU |
1 | /* |
2 | * PS3 FLASH ROM Storage Driver | |
3 | * | |
4 | * Copyright (C) 2007 Sony Computer Entertainment Inc. | |
5 | * Copyright 2007 Sony Corp. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published | |
9 | * by the Free Software Foundation; version 2 of the License. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, but | |
12 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along | |
17 | * with this program; if not, write to the Free Software Foundation, Inc., | |
18 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
19 | */ | |
20 | ||
21 | #include <linux/fs.h> | |
22 | #include <linux/miscdevice.h> | |
5a0e3ad6 | 23 | #include <linux/slab.h> |
f9652635 GU |
24 | #include <linux/uaccess.h> |
25 | ||
26 | #include <asm/lv1call.h> | |
27 | #include <asm/ps3stor.h> | |
28 | ||
29 | ||
30 | #define DEVICE_NAME "ps3flash" | |
31 | ||
32 | #define FLASH_BLOCK_SIZE (256*1024) | |
33 | ||
34 | ||
35 | struct ps3flash_private { | |
36 | struct mutex mutex; /* Bounce buffer mutex */ | |
6bd57f2e GU |
37 | u64 chunk_sectors; |
38 | int tag; /* Start sector of buffer, -1 if invalid */ | |
39 | bool dirty; | |
f9652635 GU |
40 | }; |
41 | ||
42 | static struct ps3_storage_device *ps3flash_dev; | |
43 | ||
6bd57f2e | 44 | static int ps3flash_read_write_sectors(struct ps3_storage_device *dev, |
42e27bfc | 45 | u64 start_sector, int write) |
f9652635 | 46 | { |
42e27bfc GU |
47 | struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd); |
48 | u64 res = ps3stor_read_write_sectors(dev, dev->bounce_lpar, | |
49 | start_sector, priv->chunk_sectors, | |
f9652635 GU |
50 | write); |
51 | if (res) { | |
4c33d2dc | 52 | dev_err(&dev->sbd.core, "%s:%u: %s failed 0x%llx\n", __func__, |
f9652635 GU |
53 | __LINE__, write ? "write" : "read", res); |
54 | return -EIO; | |
55 | } | |
6bd57f2e | 56 | return 0; |
f9652635 GU |
57 | } |
58 | ||
6bd57f2e | 59 | static int ps3flash_writeback(struct ps3_storage_device *dev) |
f9652635 | 60 | { |
6bd57f2e GU |
61 | struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd); |
62 | int res; | |
f9652635 | 63 | |
6bd57f2e GU |
64 | if (!priv->dirty || priv->tag < 0) |
65 | return 0; | |
66 | ||
42e27bfc | 67 | res = ps3flash_read_write_sectors(dev, priv->tag, 1); |
6bd57f2e GU |
68 | if (res) |
69 | return res; | |
f9652635 | 70 | |
6bd57f2e GU |
71 | priv->dirty = false; |
72 | return 0; | |
f9652635 GU |
73 | } |
74 | ||
42e27bfc | 75 | static int ps3flash_fetch(struct ps3_storage_device *dev, u64 start_sector) |
f9652635 | 76 | { |
6bd57f2e | 77 | struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd); |
6bd57f2e GU |
78 | int res; |
79 | ||
42e27bfc | 80 | if (start_sector == priv->tag) |
6bd57f2e GU |
81 | return 0; |
82 | ||
83 | res = ps3flash_writeback(dev); | |
84 | if (res) | |
85 | return res; | |
86 | ||
87 | priv->tag = -1; | |
88 | ||
42e27bfc | 89 | res = ps3flash_read_write_sectors(dev, start_sector, 0); |
6bd57f2e GU |
90 | if (res) |
91 | return res; | |
92 | ||
42e27bfc | 93 | priv->tag = start_sector; |
6bd57f2e | 94 | return 0; |
f9652635 GU |
95 | } |
96 | ||
97 | static loff_t ps3flash_llseek(struct file *file, loff_t offset, int origin) | |
98 | { | |
99 | struct ps3_storage_device *dev = ps3flash_dev; | |
100 | loff_t res; | |
101 | ||
102 | mutex_lock(&file->f_mapping->host->i_mutex); | |
103 | switch (origin) { | |
104 | case 1: | |
105 | offset += file->f_pos; | |
106 | break; | |
107 | case 2: | |
108 | offset += dev->regions[dev->region_idx].size*dev->blk_size; | |
109 | break; | |
110 | } | |
111 | if (offset < 0) { | |
112 | res = -EINVAL; | |
113 | goto out; | |
114 | } | |
115 | ||
116 | file->f_pos = offset; | |
117 | res = file->f_pos; | |
118 | ||
119 | out: | |
120 | mutex_unlock(&file->f_mapping->host->i_mutex); | |
121 | return res; | |
122 | } | |
123 | ||
a4e623fb GU |
124 | static ssize_t ps3flash_read(char __user *userbuf, void *kernelbuf, |
125 | size_t count, loff_t *pos) | |
f9652635 GU |
126 | { |
127 | struct ps3_storage_device *dev = ps3flash_dev; | |
559dc87f | 128 | struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd); |
42e27bfc | 129 | u64 size, sector, offset; |
6bd57f2e | 130 | int res; |
f9652635 | 131 | size_t remaining, n; |
a4e623fb | 132 | const void *src; |
f9652635 GU |
133 | |
134 | dev_dbg(&dev->sbd.core, | |
a4e623fb GU |
135 | "%s:%u: Reading %zu bytes at position %lld to U0x%p/K0x%p\n", |
136 | __func__, __LINE__, count, *pos, userbuf, kernelbuf); | |
f9652635 GU |
137 | |
138 | size = dev->regions[dev->region_idx].size*dev->blk_size; | |
139 | if (*pos >= size || !count) | |
140 | return 0; | |
141 | ||
142 | if (*pos + count > size) { | |
143 | dev_dbg(&dev->sbd.core, | |
144 | "%s:%u Truncating count from %zu to %llu\n", __func__, | |
145 | __LINE__, count, size - *pos); | |
146 | count = size - *pos; | |
147 | } | |
148 | ||
42e27bfc | 149 | sector = *pos / dev->bounce_size * priv->chunk_sectors; |
6bd57f2e | 150 | offset = *pos % dev->bounce_size; |
f9652635 GU |
151 | |
152 | remaining = count; | |
153 | do { | |
42e27bfc GU |
154 | n = min_t(u64, remaining, dev->bounce_size - offset); |
155 | src = dev->bounce_buf + offset; | |
6bd57f2e | 156 | |
f9652635 GU |
157 | mutex_lock(&priv->mutex); |
158 | ||
42e27bfc | 159 | res = ps3flash_fetch(dev, sector); |
6bd57f2e | 160 | if (res) |
f9652635 | 161 | goto fail; |
f9652635 | 162 | |
f9652635 | 163 | dev_dbg(&dev->sbd.core, |
a4e623fb GU |
164 | "%s:%u: copy %lu bytes from 0x%p to U0x%p/K0x%p\n", |
165 | __func__, __LINE__, n, src, userbuf, kernelbuf); | |
166 | if (userbuf) { | |
167 | if (copy_to_user(userbuf, src, n)) { | |
6bd57f2e | 168 | res = -EFAULT; |
a4e623fb GU |
169 | goto fail; |
170 | } | |
171 | userbuf += n; | |
172 | } | |
173 | if (kernelbuf) { | |
174 | memcpy(kernelbuf, src, n); | |
175 | kernelbuf += n; | |
f9652635 GU |
176 | } |
177 | ||
178 | mutex_unlock(&priv->mutex); | |
179 | ||
180 | *pos += n; | |
f9652635 | 181 | remaining -= n; |
42e27bfc | 182 | sector += priv->chunk_sectors; |
f9652635 GU |
183 | offset = 0; |
184 | } while (remaining > 0); | |
185 | ||
186 | return count; | |
187 | ||
188 | fail: | |
6bd57f2e GU |
189 | mutex_unlock(&priv->mutex); |
190 | return res; | |
f9652635 GU |
191 | } |
192 | ||
a4e623fb GU |
193 | static ssize_t ps3flash_write(const char __user *userbuf, |
194 | const void *kernelbuf, size_t count, loff_t *pos) | |
f9652635 GU |
195 | { |
196 | struct ps3_storage_device *dev = ps3flash_dev; | |
559dc87f | 197 | struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd); |
6bd57f2e GU |
198 | u64 size, sector, offset; |
199 | int res = 0; | |
f9652635 | 200 | size_t remaining, n; |
a4e623fb | 201 | void *dst; |
f9652635 GU |
202 | |
203 | dev_dbg(&dev->sbd.core, | |
a4e623fb GU |
204 | "%s:%u: Writing %zu bytes at position %lld from U0x%p/K0x%p\n", |
205 | __func__, __LINE__, count, *pos, userbuf, kernelbuf); | |
f9652635 GU |
206 | |
207 | size = dev->regions[dev->region_idx].size*dev->blk_size; | |
208 | if (*pos >= size || !count) | |
209 | return 0; | |
210 | ||
211 | if (*pos + count > size) { | |
212 | dev_dbg(&dev->sbd.core, | |
213 | "%s:%u Truncating count from %zu to %llu\n", __func__, | |
214 | __LINE__, count, size - *pos); | |
215 | count = size - *pos; | |
216 | } | |
217 | ||
6bd57f2e | 218 | sector = *pos / dev->bounce_size * priv->chunk_sectors; |
f9652635 | 219 | offset = *pos % dev->bounce_size; |
f9652635 GU |
220 | |
221 | remaining = count; | |
222 | do { | |
6bd57f2e | 223 | n = min_t(u64, remaining, dev->bounce_size - offset); |
42e27bfc | 224 | dst = dev->bounce_buf + offset; |
6bd57f2e | 225 | |
f9652635 GU |
226 | mutex_lock(&priv->mutex); |
227 | ||
6bd57f2e | 228 | if (n != dev->bounce_size) |
42e27bfc | 229 | res = ps3flash_fetch(dev, sector); |
6bd57f2e GU |
230 | else if (sector != priv->tag) |
231 | res = ps3flash_writeback(dev); | |
232 | if (res) | |
233 | goto fail; | |
f9652635 | 234 | |
f9652635 | 235 | dev_dbg(&dev->sbd.core, |
a4e623fb GU |
236 | "%s:%u: copy %lu bytes from U0x%p/K0x%p to 0x%p\n", |
237 | __func__, __LINE__, n, userbuf, kernelbuf, dst); | |
238 | if (userbuf) { | |
239 | if (copy_from_user(dst, userbuf, n)) { | |
240 | res = -EFAULT; | |
241 | goto fail; | |
242 | } | |
243 | userbuf += n; | |
244 | } | |
245 | if (kernelbuf) { | |
246 | memcpy(dst, kernelbuf, n); | |
247 | kernelbuf += n; | |
f9652635 GU |
248 | } |
249 | ||
6bd57f2e GU |
250 | priv->tag = sector; |
251 | priv->dirty = true; | |
f9652635 GU |
252 | |
253 | mutex_unlock(&priv->mutex); | |
254 | ||
255 | *pos += n; | |
f9652635 | 256 | remaining -= n; |
6bd57f2e | 257 | sector += priv->chunk_sectors; |
f9652635 GU |
258 | offset = 0; |
259 | } while (remaining > 0); | |
260 | ||
261 | return count; | |
262 | ||
263 | fail: | |
264 | mutex_unlock(&priv->mutex); | |
265 | return res; | |
266 | } | |
267 | ||
a4e623fb GU |
268 | static ssize_t ps3flash_user_read(struct file *file, char __user *buf, |
269 | size_t count, loff_t *pos) | |
270 | { | |
271 | return ps3flash_read(buf, NULL, count, pos); | |
272 | } | |
273 | ||
274 | static ssize_t ps3flash_user_write(struct file *file, const char __user *buf, | |
275 | size_t count, loff_t *pos) | |
276 | { | |
277 | return ps3flash_write(buf, NULL, count, pos); | |
278 | } | |
279 | ||
280 | static ssize_t ps3flash_kernel_read(void *buf, size_t count, loff_t pos) | |
281 | { | |
282 | return ps3flash_read(NULL, buf, count, &pos); | |
283 | } | |
284 | ||
285 | static ssize_t ps3flash_kernel_write(const void *buf, size_t count, | |
286 | loff_t pos) | |
287 | { | |
6bd57f2e GU |
288 | ssize_t res; |
289 | int wb; | |
290 | ||
291 | res = ps3flash_write(NULL, buf, count, &pos); | |
292 | if (res < 0) | |
293 | return res; | |
294 | ||
295 | /* Make kernel writes synchronous */ | |
296 | wb = ps3flash_writeback(ps3flash_dev); | |
297 | if (wb) | |
298 | return wb; | |
299 | ||
300 | return res; | |
a4e623fb GU |
301 | } |
302 | ||
6bd57f2e GU |
303 | static int ps3flash_flush(struct file *file, fl_owner_t id) |
304 | { | |
305 | return ps3flash_writeback(ps3flash_dev); | |
306 | } | |
307 | ||
7ea80859 | 308 | static int ps3flash_fsync(struct file *file, int datasync) |
6bd57f2e GU |
309 | { |
310 | return ps3flash_writeback(ps3flash_dev); | |
311 | } | |
f9652635 GU |
312 | |
313 | static irqreturn_t ps3flash_interrupt(int irq, void *data) | |
314 | { | |
315 | struct ps3_storage_device *dev = data; | |
316 | int res; | |
317 | u64 tag, status; | |
318 | ||
319 | res = lv1_storage_get_async_status(dev->sbd.dev_id, &tag, &status); | |
320 | ||
321 | if (tag != dev->tag) | |
322 | dev_err(&dev->sbd.core, | |
4c33d2dc | 323 | "%s:%u: tag mismatch, got %llx, expected %llx\n", |
f9652635 GU |
324 | __func__, __LINE__, tag, dev->tag); |
325 | ||
326 | if (res) { | |
4c33d2dc | 327 | dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%llx\n", |
f9652635 GU |
328 | __func__, __LINE__, res, status); |
329 | } else { | |
330 | dev->lv1_status = status; | |
331 | complete(&dev->done); | |
332 | } | |
333 | return IRQ_HANDLED; | |
334 | } | |
335 | ||
f9652635 GU |
336 | static const struct file_operations ps3flash_fops = { |
337 | .owner = THIS_MODULE, | |
338 | .llseek = ps3flash_llseek, | |
a4e623fb GU |
339 | .read = ps3flash_user_read, |
340 | .write = ps3flash_user_write, | |
6bd57f2e GU |
341 | .flush = ps3flash_flush, |
342 | .fsync = ps3flash_fsync, | |
a4e623fb GU |
343 | }; |
344 | ||
345 | static const struct ps3_os_area_flash_ops ps3flash_kernel_ops = { | |
346 | .read = ps3flash_kernel_read, | |
347 | .write = ps3flash_kernel_write, | |
f9652635 GU |
348 | }; |
349 | ||
350 | static struct miscdevice ps3flash_misc = { | |
351 | .minor = MISC_DYNAMIC_MINOR, | |
352 | .name = DEVICE_NAME, | |
353 | .fops = &ps3flash_fops, | |
354 | }; | |
355 | ||
356 | static int __devinit ps3flash_probe(struct ps3_system_bus_device *_dev) | |
357 | { | |
358 | struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core); | |
359 | struct ps3flash_private *priv; | |
360 | int error; | |
361 | unsigned long tmp; | |
362 | ||
363 | tmp = dev->regions[dev->region_idx].start*dev->blk_size; | |
364 | if (tmp % FLASH_BLOCK_SIZE) { | |
365 | dev_err(&dev->sbd.core, | |
366 | "%s:%u region start %lu is not aligned\n", __func__, | |
367 | __LINE__, tmp); | |
368 | return -EINVAL; | |
369 | } | |
370 | tmp = dev->regions[dev->region_idx].size*dev->blk_size; | |
371 | if (tmp % FLASH_BLOCK_SIZE) { | |
372 | dev_err(&dev->sbd.core, | |
373 | "%s:%u region size %lu is not aligned\n", __func__, | |
374 | __LINE__, tmp); | |
375 | return -EINVAL; | |
376 | } | |
377 | ||
378 | /* use static buffer, kmalloc cannot allocate 256 KiB */ | |
379 | if (!ps3flash_bounce_buffer.address) | |
380 | return -ENODEV; | |
381 | ||
382 | if (ps3flash_dev) { | |
383 | dev_err(&dev->sbd.core, | |
384 | "Only one FLASH device is supported\n"); | |
385 | return -EBUSY; | |
386 | } | |
387 | ||
388 | ps3flash_dev = dev; | |
389 | ||
390 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); | |
391 | if (!priv) { | |
392 | error = -ENOMEM; | |
393 | goto fail; | |
394 | } | |
395 | ||
559dc87f | 396 | ps3_system_bus_set_drvdata(&dev->sbd, priv); |
f9652635 | 397 | mutex_init(&priv->mutex); |
6bd57f2e | 398 | priv->tag = -1; |
f9652635 GU |
399 | |
400 | dev->bounce_size = ps3flash_bounce_buffer.size; | |
401 | dev->bounce_buf = ps3flash_bounce_buffer.address; | |
6bd57f2e | 402 | priv->chunk_sectors = dev->bounce_size / dev->blk_size; |
f9652635 GU |
403 | |
404 | error = ps3stor_setup(dev, ps3flash_interrupt); | |
405 | if (error) | |
406 | goto fail_free_priv; | |
407 | ||
408 | ps3flash_misc.parent = &dev->sbd.core; | |
409 | error = misc_register(&ps3flash_misc); | |
410 | if (error) { | |
411 | dev_err(&dev->sbd.core, "%s:%u: misc_register failed %d\n", | |
412 | __func__, __LINE__, error); | |
413 | goto fail_teardown; | |
414 | } | |
415 | ||
416 | dev_info(&dev->sbd.core, "%s:%u: registered misc device %d\n", | |
417 | __func__, __LINE__, ps3flash_misc.minor); | |
a4e623fb GU |
418 | |
419 | ps3_os_area_flash_register(&ps3flash_kernel_ops); | |
f9652635 GU |
420 | return 0; |
421 | ||
422 | fail_teardown: | |
423 | ps3stor_teardown(dev); | |
424 | fail_free_priv: | |
425 | kfree(priv); | |
559dc87f | 426 | ps3_system_bus_set_drvdata(&dev->sbd, NULL); |
f9652635 GU |
427 | fail: |
428 | ps3flash_dev = NULL; | |
429 | return error; | |
430 | } | |
431 | ||
432 | static int ps3flash_remove(struct ps3_system_bus_device *_dev) | |
433 | { | |
434 | struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core); | |
435 | ||
a4e623fb | 436 | ps3_os_area_flash_register(NULL); |
f9652635 GU |
437 | misc_deregister(&ps3flash_misc); |
438 | ps3stor_teardown(dev); | |
559dc87f GU |
439 | kfree(ps3_system_bus_get_drvdata(&dev->sbd)); |
440 | ps3_system_bus_set_drvdata(&dev->sbd, NULL); | |
f9652635 GU |
441 | ps3flash_dev = NULL; |
442 | return 0; | |
443 | } | |
444 | ||
445 | ||
446 | static struct ps3_system_bus_driver ps3flash = { | |
447 | .match_id = PS3_MATCH_ID_STOR_FLASH, | |
448 | .core.name = DEVICE_NAME, | |
449 | .core.owner = THIS_MODULE, | |
450 | .probe = ps3flash_probe, | |
451 | .remove = ps3flash_remove, | |
452 | .shutdown = ps3flash_remove, | |
453 | }; | |
454 | ||
455 | ||
456 | static int __init ps3flash_init(void) | |
457 | { | |
458 | return ps3_system_bus_driver_register(&ps3flash); | |
459 | } | |
460 | ||
461 | static void __exit ps3flash_exit(void) | |
462 | { | |
463 | ps3_system_bus_driver_unregister(&ps3flash); | |
464 | } | |
465 | ||
466 | module_init(ps3flash_init); | |
467 | module_exit(ps3flash_exit); | |
468 | ||
469 | MODULE_LICENSE("GPL"); | |
470 | MODULE_DESCRIPTION("PS3 FLASH ROM Storage Driver"); | |
471 | MODULE_AUTHOR("Sony Corporation"); | |
472 | MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_FLASH); |