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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> | |
23 | #include <linux/uaccess.h> | |
24 | ||
25 | #include <asm/lv1call.h> | |
26 | #include <asm/ps3stor.h> | |
27 | ||
28 | ||
29 | #define DEVICE_NAME "ps3flash" | |
30 | ||
31 | #define FLASH_BLOCK_SIZE (256*1024) | |
32 | ||
33 | ||
34 | struct ps3flash_private { | |
35 | struct mutex mutex; /* Bounce buffer mutex */ | |
6bd57f2e GU |
36 | u64 chunk_sectors; |
37 | int tag; /* Start sector of buffer, -1 if invalid */ | |
38 | bool dirty; | |
f9652635 GU |
39 | }; |
40 | ||
41 | static struct ps3_storage_device *ps3flash_dev; | |
42 | ||
6bd57f2e | 43 | static int ps3flash_read_write_sectors(struct ps3_storage_device *dev, |
42e27bfc | 44 | u64 start_sector, int write) |
f9652635 | 45 | { |
42e27bfc GU |
46 | struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd); |
47 | u64 res = ps3stor_read_write_sectors(dev, dev->bounce_lpar, | |
48 | start_sector, priv->chunk_sectors, | |
f9652635 GU |
49 | write); |
50 | if (res) { | |
4c33d2dc | 51 | dev_err(&dev->sbd.core, "%s:%u: %s failed 0x%llx\n", __func__, |
f9652635 GU |
52 | __LINE__, write ? "write" : "read", res); |
53 | return -EIO; | |
54 | } | |
6bd57f2e | 55 | return 0; |
f9652635 GU |
56 | } |
57 | ||
6bd57f2e | 58 | static int ps3flash_writeback(struct ps3_storage_device *dev) |
f9652635 | 59 | { |
6bd57f2e GU |
60 | struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd); |
61 | int res; | |
f9652635 | 62 | |
6bd57f2e GU |
63 | if (!priv->dirty || priv->tag < 0) |
64 | return 0; | |
65 | ||
42e27bfc | 66 | res = ps3flash_read_write_sectors(dev, priv->tag, 1); |
6bd57f2e GU |
67 | if (res) |
68 | return res; | |
f9652635 | 69 | |
6bd57f2e GU |
70 | priv->dirty = false; |
71 | return 0; | |
f9652635 GU |
72 | } |
73 | ||
42e27bfc | 74 | static int ps3flash_fetch(struct ps3_storage_device *dev, u64 start_sector) |
f9652635 | 75 | { |
6bd57f2e | 76 | struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd); |
6bd57f2e GU |
77 | int res; |
78 | ||
42e27bfc | 79 | if (start_sector == priv->tag) |
6bd57f2e GU |
80 | return 0; |
81 | ||
82 | res = ps3flash_writeback(dev); | |
83 | if (res) | |
84 | return res; | |
85 | ||
86 | priv->tag = -1; | |
87 | ||
42e27bfc | 88 | res = ps3flash_read_write_sectors(dev, start_sector, 0); |
6bd57f2e GU |
89 | if (res) |
90 | return res; | |
91 | ||
42e27bfc | 92 | priv->tag = start_sector; |
6bd57f2e | 93 | return 0; |
f9652635 GU |
94 | } |
95 | ||
96 | static loff_t ps3flash_llseek(struct file *file, loff_t offset, int origin) | |
97 | { | |
98 | struct ps3_storage_device *dev = ps3flash_dev; | |
99 | loff_t res; | |
100 | ||
101 | mutex_lock(&file->f_mapping->host->i_mutex); | |
102 | switch (origin) { | |
103 | case 1: | |
104 | offset += file->f_pos; | |
105 | break; | |
106 | case 2: | |
107 | offset += dev->regions[dev->region_idx].size*dev->blk_size; | |
108 | break; | |
109 | } | |
110 | if (offset < 0) { | |
111 | res = -EINVAL; | |
112 | goto out; | |
113 | } | |
114 | ||
115 | file->f_pos = offset; | |
116 | res = file->f_pos; | |
117 | ||
118 | out: | |
119 | mutex_unlock(&file->f_mapping->host->i_mutex); | |
120 | return res; | |
121 | } | |
122 | ||
a4e623fb GU |
123 | static ssize_t ps3flash_read(char __user *userbuf, void *kernelbuf, |
124 | size_t count, loff_t *pos) | |
f9652635 GU |
125 | { |
126 | struct ps3_storage_device *dev = ps3flash_dev; | |
559dc87f | 127 | struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd); |
42e27bfc | 128 | u64 size, sector, offset; |
6bd57f2e | 129 | int res; |
f9652635 | 130 | size_t remaining, n; |
a4e623fb | 131 | const void *src; |
f9652635 GU |
132 | |
133 | dev_dbg(&dev->sbd.core, | |
a4e623fb GU |
134 | "%s:%u: Reading %zu bytes at position %lld to U0x%p/K0x%p\n", |
135 | __func__, __LINE__, count, *pos, userbuf, kernelbuf); | |
f9652635 GU |
136 | |
137 | size = dev->regions[dev->region_idx].size*dev->blk_size; | |
138 | if (*pos >= size || !count) | |
139 | return 0; | |
140 | ||
141 | if (*pos + count > size) { | |
142 | dev_dbg(&dev->sbd.core, | |
143 | "%s:%u Truncating count from %zu to %llu\n", __func__, | |
144 | __LINE__, count, size - *pos); | |
145 | count = size - *pos; | |
146 | } | |
147 | ||
42e27bfc | 148 | sector = *pos / dev->bounce_size * priv->chunk_sectors; |
6bd57f2e | 149 | offset = *pos % dev->bounce_size; |
f9652635 GU |
150 | |
151 | remaining = count; | |
152 | do { | |
42e27bfc GU |
153 | n = min_t(u64, remaining, dev->bounce_size - offset); |
154 | src = dev->bounce_buf + offset; | |
6bd57f2e | 155 | |
f9652635 GU |
156 | mutex_lock(&priv->mutex); |
157 | ||
42e27bfc | 158 | res = ps3flash_fetch(dev, sector); |
6bd57f2e | 159 | if (res) |
f9652635 | 160 | goto fail; |
f9652635 | 161 | |
f9652635 | 162 | dev_dbg(&dev->sbd.core, |
a4e623fb GU |
163 | "%s:%u: copy %lu bytes from 0x%p to U0x%p/K0x%p\n", |
164 | __func__, __LINE__, n, src, userbuf, kernelbuf); | |
165 | if (userbuf) { | |
166 | if (copy_to_user(userbuf, src, n)) { | |
6bd57f2e | 167 | res = -EFAULT; |
a4e623fb GU |
168 | goto fail; |
169 | } | |
170 | userbuf += n; | |
171 | } | |
172 | if (kernelbuf) { | |
173 | memcpy(kernelbuf, src, n); | |
174 | kernelbuf += n; | |
f9652635 GU |
175 | } |
176 | ||
177 | mutex_unlock(&priv->mutex); | |
178 | ||
179 | *pos += n; | |
f9652635 | 180 | remaining -= n; |
42e27bfc | 181 | sector += priv->chunk_sectors; |
f9652635 GU |
182 | offset = 0; |
183 | } while (remaining > 0); | |
184 | ||
185 | return count; | |
186 | ||
187 | fail: | |
6bd57f2e GU |
188 | mutex_unlock(&priv->mutex); |
189 | return res; | |
f9652635 GU |
190 | } |
191 | ||
a4e623fb GU |
192 | static ssize_t ps3flash_write(const char __user *userbuf, |
193 | const void *kernelbuf, size_t count, loff_t *pos) | |
f9652635 GU |
194 | { |
195 | struct ps3_storage_device *dev = ps3flash_dev; | |
559dc87f | 196 | struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd); |
6bd57f2e GU |
197 | u64 size, sector, offset; |
198 | int res = 0; | |
f9652635 | 199 | size_t remaining, n; |
a4e623fb | 200 | void *dst; |
f9652635 GU |
201 | |
202 | dev_dbg(&dev->sbd.core, | |
a4e623fb GU |
203 | "%s:%u: Writing %zu bytes at position %lld from U0x%p/K0x%p\n", |
204 | __func__, __LINE__, count, *pos, userbuf, kernelbuf); | |
f9652635 GU |
205 | |
206 | size = dev->regions[dev->region_idx].size*dev->blk_size; | |
207 | if (*pos >= size || !count) | |
208 | return 0; | |
209 | ||
210 | if (*pos + count > size) { | |
211 | dev_dbg(&dev->sbd.core, | |
212 | "%s:%u Truncating count from %zu to %llu\n", __func__, | |
213 | __LINE__, count, size - *pos); | |
214 | count = size - *pos; | |
215 | } | |
216 | ||
6bd57f2e | 217 | sector = *pos / dev->bounce_size * priv->chunk_sectors; |
f9652635 | 218 | offset = *pos % dev->bounce_size; |
f9652635 GU |
219 | |
220 | remaining = count; | |
221 | do { | |
6bd57f2e | 222 | n = min_t(u64, remaining, dev->bounce_size - offset); |
42e27bfc | 223 | dst = dev->bounce_buf + offset; |
6bd57f2e | 224 | |
f9652635 GU |
225 | mutex_lock(&priv->mutex); |
226 | ||
6bd57f2e | 227 | if (n != dev->bounce_size) |
42e27bfc | 228 | res = ps3flash_fetch(dev, sector); |
6bd57f2e GU |
229 | else if (sector != priv->tag) |
230 | res = ps3flash_writeback(dev); | |
231 | if (res) | |
232 | goto fail; | |
f9652635 | 233 | |
f9652635 | 234 | dev_dbg(&dev->sbd.core, |
a4e623fb GU |
235 | "%s:%u: copy %lu bytes from U0x%p/K0x%p to 0x%p\n", |
236 | __func__, __LINE__, n, userbuf, kernelbuf, dst); | |
237 | if (userbuf) { | |
238 | if (copy_from_user(dst, userbuf, n)) { | |
239 | res = -EFAULT; | |
240 | goto fail; | |
241 | } | |
242 | userbuf += n; | |
243 | } | |
244 | if (kernelbuf) { | |
245 | memcpy(dst, kernelbuf, n); | |
246 | kernelbuf += n; | |
f9652635 GU |
247 | } |
248 | ||
6bd57f2e GU |
249 | priv->tag = sector; |
250 | priv->dirty = true; | |
f9652635 GU |
251 | |
252 | mutex_unlock(&priv->mutex); | |
253 | ||
254 | *pos += n; | |
f9652635 | 255 | remaining -= n; |
6bd57f2e | 256 | sector += priv->chunk_sectors; |
f9652635 GU |
257 | offset = 0; |
258 | } while (remaining > 0); | |
259 | ||
260 | return count; | |
261 | ||
262 | fail: | |
263 | mutex_unlock(&priv->mutex); | |
264 | return res; | |
265 | } | |
266 | ||
a4e623fb GU |
267 | static ssize_t ps3flash_user_read(struct file *file, char __user *buf, |
268 | size_t count, loff_t *pos) | |
269 | { | |
270 | return ps3flash_read(buf, NULL, count, pos); | |
271 | } | |
272 | ||
273 | static ssize_t ps3flash_user_write(struct file *file, const char __user *buf, | |
274 | size_t count, loff_t *pos) | |
275 | { | |
276 | return ps3flash_write(buf, NULL, count, pos); | |
277 | } | |
278 | ||
279 | static ssize_t ps3flash_kernel_read(void *buf, size_t count, loff_t pos) | |
280 | { | |
281 | return ps3flash_read(NULL, buf, count, &pos); | |
282 | } | |
283 | ||
284 | static ssize_t ps3flash_kernel_write(const void *buf, size_t count, | |
285 | loff_t pos) | |
286 | { | |
6bd57f2e GU |
287 | ssize_t res; |
288 | int wb; | |
289 | ||
290 | res = ps3flash_write(NULL, buf, count, &pos); | |
291 | if (res < 0) | |
292 | return res; | |
293 | ||
294 | /* Make kernel writes synchronous */ | |
295 | wb = ps3flash_writeback(ps3flash_dev); | |
296 | if (wb) | |
297 | return wb; | |
298 | ||
299 | return res; | |
a4e623fb GU |
300 | } |
301 | ||
6bd57f2e GU |
302 | static int ps3flash_flush(struct file *file, fl_owner_t id) |
303 | { | |
304 | return ps3flash_writeback(ps3flash_dev); | |
305 | } | |
306 | ||
307 | static int ps3flash_fsync(struct file *file, struct dentry *dentry, | |
308 | int datasync) | |
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); |