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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/slab.h> |
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 */ |
37 | u64 chunk_sectors; |
38 | int tag; /* Start sector of buffer, -1 if invalid */ |
39 | bool dirty; |
40 | }; |
41 | |
42 | static struct ps3_storage_device *ps3flash_dev; |
43 | |
44 | static int ps3flash_read_write_sectors(struct ps3_storage_device *dev, |
45 | u64 start_sector, int write) |
46 | { |
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, |
50 | write); |
51 | if (res) { |
52 | dev_err(&dev->sbd.core, "%s:%u: %s failed 0x%llx\n", __func__, |
53 | __LINE__, write ? "write" : "read", res); |
54 | return -EIO; |
55 | } |
56 | return 0; |
57 | } |
58 | |
59 | static int ps3flash_writeback(struct ps3_storage_device *dev) |
60 | { |
61 | struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd); |
62 | int res; |
63 | |
64 | if (!priv->dirty || priv->tag < 0) |
65 | return 0; |
66 | |
67 | res = ps3flash_read_write_sectors(dev, priv->tag, 1); |
68 | if (res) |
69 | return res; |
70 | |
71 | priv->dirty = false; |
72 | return 0; |
73 | } |
74 | |
75 | static int ps3flash_fetch(struct ps3_storage_device *dev, u64 start_sector) |
76 | { |
77 | struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd); |
78 | int res; |
79 | |
80 | if (start_sector == priv->tag) |
81 | return 0; |
82 | |
83 | res = ps3flash_writeback(dev); |
84 | if (res) |
85 | return res; |
86 | |
87 | priv->tag = -1; |
88 | |
89 | res = ps3flash_read_write_sectors(dev, start_sector, 0); |
90 | if (res) |
91 | return res; |
92 | |
93 | priv->tag = start_sector; |
94 | return 0; |
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 | |
124 | static ssize_t ps3flash_read(char __user *userbuf, void *kernelbuf, |
125 | size_t count, loff_t *pos) |
126 | { |
127 | struct ps3_storage_device *dev = ps3flash_dev; |
128 | struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd); |
129 | u64 size, sector, offset; |
130 | int res; |
131 | size_t remaining, n; |
132 | const void *src; |
133 | |
134 | dev_dbg(&dev->sbd.core, |
135 | "%s:%u: Reading %zu bytes at position %lld to U0x%p/K0x%p\n", |
136 | __func__, __LINE__, count, *pos, userbuf, kernelbuf); |
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 | |
149 | sector = *pos / dev->bounce_size * priv->chunk_sectors; |
150 | offset = *pos % dev->bounce_size; |
151 | |
152 | remaining = count; |
153 | do { |
154 | n = min_t(u64, remaining, dev->bounce_size - offset); |
155 | src = dev->bounce_buf + offset; |
156 | |
157 | mutex_lock(&priv->mutex); |
158 | |
159 | res = ps3flash_fetch(dev, sector); |
160 | if (res) |
161 | goto fail; |
162 | |
163 | dev_dbg(&dev->sbd.core, |
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)) { |
168 | res = -EFAULT; |
169 | goto fail; |
170 | } |
171 | userbuf += n; |
172 | } |
173 | if (kernelbuf) { |
174 | memcpy(kernelbuf, src, n); |
175 | kernelbuf += n; |
176 | } |
177 | |
178 | mutex_unlock(&priv->mutex); |
179 | |
180 | *pos += n; |
181 | remaining -= n; |
182 | sector += priv->chunk_sectors; |
183 | offset = 0; |
184 | } while (remaining > 0); |
185 | |
186 | return count; |
187 | |
188 | fail: |
189 | mutex_unlock(&priv->mutex); |
190 | return res; |
191 | } |
192 | |
193 | static ssize_t ps3flash_write(const char __user *userbuf, |
194 | const void *kernelbuf, size_t count, loff_t *pos) |
195 | { |
196 | struct ps3_storage_device *dev = ps3flash_dev; |
197 | struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd); |
198 | u64 size, sector, offset; |
199 | int res = 0; |
200 | size_t remaining, n; |
201 | void *dst; |
202 | |
203 | dev_dbg(&dev->sbd.core, |
204 | "%s:%u: Writing %zu bytes at position %lld from U0x%p/K0x%p\n", |
205 | __func__, __LINE__, count, *pos, userbuf, kernelbuf); |
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 | |
218 | sector = *pos / dev->bounce_size * priv->chunk_sectors; |
219 | offset = *pos % dev->bounce_size; |
220 | |
221 | remaining = count; |
222 | do { |
223 | n = min_t(u64, remaining, dev->bounce_size - offset); |
224 | dst = dev->bounce_buf + offset; |
225 | |
226 | mutex_lock(&priv->mutex); |
227 | |
228 | if (n != dev->bounce_size) |
229 | res = ps3flash_fetch(dev, sector); |
230 | else if (sector != priv->tag) |
231 | res = ps3flash_writeback(dev); |
232 | if (res) |
233 | goto fail; |
234 | |
235 | dev_dbg(&dev->sbd.core, |
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; |
248 | } |
249 | |
250 | priv->tag = sector; |
251 | priv->dirty = true; |
252 | |
253 | mutex_unlock(&priv->mutex); |
254 | |
255 | *pos += n; |
256 | remaining -= n; |
257 | sector += priv->chunk_sectors; |
258 | offset = 0; |
259 | } while (remaining > 0); |
260 | |
261 | return count; |
262 | |
263 | fail: |
264 | mutex_unlock(&priv->mutex); |
265 | return res; |
266 | } |
267 | |
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 | { |
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; |
301 | } |
302 | |
303 | static int ps3flash_flush(struct file *file, fl_owner_t id) |
304 | { |
305 | return ps3flash_writeback(ps3flash_dev); |
306 | } |
307 | |
308 | static int ps3flash_fsync(struct file *file, struct dentry *dentry, |
309 | int datasync) |
310 | { |
311 | return ps3flash_writeback(ps3flash_dev); |
312 | } |
313 | |
314 | static irqreturn_t ps3flash_interrupt(int irq, void *data) |
315 | { |
316 | struct ps3_storage_device *dev = data; |
317 | int res; |
318 | u64 tag, status; |
319 | |
320 | res = lv1_storage_get_async_status(dev->sbd.dev_id, &tag, &status); |
321 | |
322 | if (tag != dev->tag) |
323 | dev_err(&dev->sbd.core, |
324 | "%s:%u: tag mismatch, got %llx, expected %llx\n", |
325 | __func__, __LINE__, tag, dev->tag); |
326 | |
327 | if (res) { |
328 | dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%llx\n", |
329 | __func__, __LINE__, res, status); |
330 | } else { |
331 | dev->lv1_status = status; |
332 | complete(&dev->done); |
333 | } |
334 | return IRQ_HANDLED; |
335 | } |
336 | |
337 | static const struct file_operations ps3flash_fops = { |
338 | .owner = THIS_MODULE, |
339 | .llseek = ps3flash_llseek, |
340 | .read = ps3flash_user_read, |
341 | .write = ps3flash_user_write, |
342 | .flush = ps3flash_flush, |
343 | .fsync = ps3flash_fsync, |
344 | }; |
345 | |
346 | static const struct ps3_os_area_flash_ops ps3flash_kernel_ops = { |
347 | .read = ps3flash_kernel_read, |
348 | .write = ps3flash_kernel_write, |
349 | }; |
350 | |
351 | static struct miscdevice ps3flash_misc = { |
352 | .minor = MISC_DYNAMIC_MINOR, |
353 | .name = DEVICE_NAME, |
354 | .fops = &ps3flash_fops, |
355 | }; |
356 | |
357 | static int __devinit ps3flash_probe(struct ps3_system_bus_device *_dev) |
358 | { |
359 | struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core); |
360 | struct ps3flash_private *priv; |
361 | int error; |
362 | unsigned long tmp; |
363 | |
364 | tmp = dev->regions[dev->region_idx].start*dev->blk_size; |
365 | if (tmp % FLASH_BLOCK_SIZE) { |
366 | dev_err(&dev->sbd.core, |
367 | "%s:%u region start %lu is not aligned\n", __func__, |
368 | __LINE__, tmp); |
369 | return -EINVAL; |
370 | } |
371 | tmp = dev->regions[dev->region_idx].size*dev->blk_size; |
372 | if (tmp % FLASH_BLOCK_SIZE) { |
373 | dev_err(&dev->sbd.core, |
374 | "%s:%u region size %lu is not aligned\n", __func__, |
375 | __LINE__, tmp); |
376 | return -EINVAL; |
377 | } |
378 | |
379 | /* use static buffer, kmalloc cannot allocate 256 KiB */ |
380 | if (!ps3flash_bounce_buffer.address) |
381 | return -ENODEV; |
382 | |
383 | if (ps3flash_dev) { |
384 | dev_err(&dev->sbd.core, |
385 | "Only one FLASH device is supported\n"); |
386 | return -EBUSY; |
387 | } |
388 | |
389 | ps3flash_dev = dev; |
390 | |
391 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); |
392 | if (!priv) { |
393 | error = -ENOMEM; |
394 | goto fail; |
395 | } |
396 | |
397 | ps3_system_bus_set_drvdata(&dev->sbd, priv); |
398 | mutex_init(&priv->mutex); |
399 | priv->tag = -1; |
400 | |
401 | dev->bounce_size = ps3flash_bounce_buffer.size; |
402 | dev->bounce_buf = ps3flash_bounce_buffer.address; |
403 | priv->chunk_sectors = dev->bounce_size / dev->blk_size; |
404 | |
405 | error = ps3stor_setup(dev, ps3flash_interrupt); |
406 | if (error) |
407 | goto fail_free_priv; |
408 | |
409 | ps3flash_misc.parent = &dev->sbd.core; |
410 | error = misc_register(&ps3flash_misc); |
411 | if (error) { |
412 | dev_err(&dev->sbd.core, "%s:%u: misc_register failed %d\n", |
413 | __func__, __LINE__, error); |
414 | goto fail_teardown; |
415 | } |
416 | |
417 | dev_info(&dev->sbd.core, "%s:%u: registered misc device %d\n", |
418 | __func__, __LINE__, ps3flash_misc.minor); |
419 | |
420 | ps3_os_area_flash_register(&ps3flash_kernel_ops); |
421 | return 0; |
422 | |
423 | fail_teardown: |
424 | ps3stor_teardown(dev); |
425 | fail_free_priv: |
426 | kfree(priv); |
427 | ps3_system_bus_set_drvdata(&dev->sbd, NULL); |
428 | fail: |
429 | ps3flash_dev = NULL; |
430 | return error; |
431 | } |
432 | |
433 | static int ps3flash_remove(struct ps3_system_bus_device *_dev) |
434 | { |
435 | struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core); |
436 | |
437 | ps3_os_area_flash_register(NULL); |
438 | misc_deregister(&ps3flash_misc); |
439 | ps3stor_teardown(dev); |
440 | kfree(ps3_system_bus_get_drvdata(&dev->sbd)); |
441 | ps3_system_bus_set_drvdata(&dev->sbd, NULL); |
442 | ps3flash_dev = NULL; |
443 | return 0; |
444 | } |
445 | |
446 | |
447 | static struct ps3_system_bus_driver ps3flash = { |
448 | .match_id = PS3_MATCH_ID_STOR_FLASH, |
449 | .core.name = DEVICE_NAME, |
450 | .core.owner = THIS_MODULE, |
451 | .probe = ps3flash_probe, |
452 | .remove = ps3flash_remove, |
453 | .shutdown = ps3flash_remove, |
454 | }; |
455 | |
456 | |
457 | static int __init ps3flash_init(void) |
458 | { |
459 | return ps3_system_bus_driver_register(&ps3flash); |
460 | } |
461 | |
462 | static void __exit ps3flash_exit(void) |
463 | { |
464 | ps3_system_bus_driver_unregister(&ps3flash); |
465 | } |
466 | |
467 | module_init(ps3flash_init); |
468 | module_exit(ps3flash_exit); |
469 | |
470 | MODULE_LICENSE("GPL"); |
471 | MODULE_DESCRIPTION("PS3 FLASH ROM Storage Driver"); |
472 | MODULE_AUTHOR("Sony Corporation"); |
473 | MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_FLASH); |
474 |
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