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 */
36 u64 chunk_sectors;
37 int tag; /* Start sector of buffer, -1 if invalid */
38 bool dirty;
39 };
40
41 static struct ps3_storage_device *ps3flash_dev;
42
43 static int ps3flash_read_write_sectors(struct ps3_storage_device *dev,
44 u64 start_sector, int write)
45 {
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,
49 write);
50 if (res) {
51 dev_err(&dev->sbd.core, "%s:%u: %s failed 0x%llx\n", __func__,
52 __LINE__, write ? "write" : "read", res);
53 return -EIO;
54 }
55 return 0;
56 }
57
58 static int ps3flash_writeback(struct ps3_storage_device *dev)
59 {
60 struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
61 int res;
62
63 if (!priv->dirty || priv->tag < 0)
64 return 0;
65
66 res = ps3flash_read_write_sectors(dev, priv->tag, 1);
67 if (res)
68 return res;
69
70 priv->dirty = false;
71 return 0;
72 }
73
74 static int ps3flash_fetch(struct ps3_storage_device *dev, u64 start_sector)
75 {
76 struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
77 int res;
78
79 if (start_sector == priv->tag)
80 return 0;
81
82 res = ps3flash_writeback(dev);
83 if (res)
84 return res;
85
86 priv->tag = -1;
87
88 res = ps3flash_read_write_sectors(dev, start_sector, 0);
89 if (res)
90 return res;
91
92 priv->tag = start_sector;
93 return 0;
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
123 static ssize_t ps3flash_read(char __user *userbuf, void *kernelbuf,
124 size_t count, loff_t *pos)
125 {
126 struct ps3_storage_device *dev = ps3flash_dev;
127 struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
128 u64 size, sector, offset;
129 int res;
130 size_t remaining, n;
131 const void *src;
132
133 dev_dbg(&dev->sbd.core,
134 "%s:%u: Reading %zu bytes at position %lld to U0x%p/K0x%p\n",
135 __func__, __LINE__, count, *pos, userbuf, kernelbuf);
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
148 sector = *pos / dev->bounce_size * priv->chunk_sectors;
149 offset = *pos % dev->bounce_size;
150
151 remaining = count;
152 do {
153 n = min_t(u64, remaining, dev->bounce_size - offset);
154 src = dev->bounce_buf + offset;
155
156 mutex_lock(&priv->mutex);
157
158 res = ps3flash_fetch(dev, sector);
159 if (res)
160 goto fail;
161
162 dev_dbg(&dev->sbd.core,
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)) {
167 res = -EFAULT;
168 goto fail;
169 }
170 userbuf += n;
171 }
172 if (kernelbuf) {
173 memcpy(kernelbuf, src, n);
174 kernelbuf += n;
175 }
176
177 mutex_unlock(&priv->mutex);
178
179 *pos += n;
180 remaining -= n;
181 sector += priv->chunk_sectors;
182 offset = 0;
183 } while (remaining > 0);
184
185 return count;
186
187 fail:
188 mutex_unlock(&priv->mutex);
189 return res;
190 }
191
192 static ssize_t ps3flash_write(const char __user *userbuf,
193 const void *kernelbuf, size_t count, loff_t *pos)
194 {
195 struct ps3_storage_device *dev = ps3flash_dev;
196 struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
197 u64 size, sector, offset;
198 int res = 0;
199 size_t remaining, n;
200 void *dst;
201
202 dev_dbg(&dev->sbd.core,
203 "%s:%u: Writing %zu bytes at position %lld from U0x%p/K0x%p\n",
204 __func__, __LINE__, count, *pos, userbuf, kernelbuf);
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
217 sector = *pos / dev->bounce_size * priv->chunk_sectors;
218 offset = *pos % dev->bounce_size;
219
220 remaining = count;
221 do {
222 n = min_t(u64, remaining, dev->bounce_size - offset);
223 dst = dev->bounce_buf + offset;
224
225 mutex_lock(&priv->mutex);
226
227 if (n != dev->bounce_size)
228 res = ps3flash_fetch(dev, sector);
229 else if (sector != priv->tag)
230 res = ps3flash_writeback(dev);
231 if (res)
232 goto fail;
233
234 dev_dbg(&dev->sbd.core,
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;
247 }
248
249 priv->tag = sector;
250 priv->dirty = true;
251
252 mutex_unlock(&priv->mutex);
253
254 *pos += n;
255 remaining -= n;
256 sector += priv->chunk_sectors;
257 offset = 0;
258 } while (remaining > 0);
259
260 return count;
261
262 fail:
263 mutex_unlock(&priv->mutex);
264 return res;
265 }
266
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 {
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;
300 }
301
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 }
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,
323 "%s:%u: tag mismatch, got %llx, expected %llx\n",
324 __func__, __LINE__, tag, dev->tag);
325
326 if (res) {
327 dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%llx\n",
328 __func__, __LINE__, res, status);
329 } else {
330 dev->lv1_status = status;
331 complete(&dev->done);
332 }
333 return IRQ_HANDLED;
334 }
335
336 static const struct file_operations ps3flash_fops = {
337 .owner = THIS_MODULE,
338 .llseek = ps3flash_llseek,
339 .read = ps3flash_user_read,
340 .write = ps3flash_user_write,
341 .flush = ps3flash_flush,
342 .fsync = ps3flash_fsync,
343 };
344
345 static const struct ps3_os_area_flash_ops ps3flash_kernel_ops = {
346 .read = ps3flash_kernel_read,
347 .write = ps3flash_kernel_write,
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
396 ps3_system_bus_set_drvdata(&dev->sbd, priv);
397 mutex_init(&priv->mutex);
398 priv->tag = -1;
399
400 dev->bounce_size = ps3flash_bounce_buffer.size;
401 dev->bounce_buf = ps3flash_bounce_buffer.address;
402 priv->chunk_sectors = dev->bounce_size / dev->blk_size;
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);
418
419 ps3_os_area_flash_register(&ps3flash_kernel_ops);
420 return 0;
421
422 fail_teardown:
423 ps3stor_teardown(dev);
424 fail_free_priv:
425 kfree(priv);
426 ps3_system_bus_set_drvdata(&dev->sbd, NULL);
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
436 ps3_os_area_flash_register(NULL);
437 misc_deregister(&ps3flash_misc);
438 ps3stor_teardown(dev);
439 kfree(ps3_system_bus_get_drvdata(&dev->sbd));
440 ps3_system_bus_set_drvdata(&dev->sbd, NULL);
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);
473
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