aboutsummaryrefslogtreecommitdiff
path: root/drivers/char/ps3flash.c
blob: 6abdde4da2b7834991a8e4e0b3feb52e0e054993 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
/*
 * PS3 FLASH ROM Storage Driver
 *
 * Copyright (C) 2007 Sony Computer Entertainment Inc.
 * Copyright 2007 Sony Corp.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published
 * by the Free Software Foundation; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include <linux/fs.h>
#include <linux/miscdevice.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/module.h>

#include <asm/lv1call.h>
#include <asm/ps3stor.h>


#define DEVICE_NAME		"ps3flash"

#define FLASH_BLOCK_SIZE	(256*1024)


struct ps3flash_private {
	struct mutex mutex;	/* Bounce buffer mutex */
	u64 chunk_sectors;
	int tag;		/* Start sector of buffer, -1 if invalid */
	bool dirty;
};

static struct ps3_storage_device *ps3flash_dev;

static int ps3flash_read_write_sectors(struct ps3_storage_device *dev,
				       u64 start_sector, int write)
{
	struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
	u64 res = ps3stor_read_write_sectors(dev, dev->bounce_lpar,
					     start_sector, priv->chunk_sectors,
					     write);
	if (res) {
		dev_err(&dev->sbd.core, "%s:%u: %s failed 0x%llx\n", __func__,
			__LINE__, write ? "write" : "read", res);
		return -EIO;
	}
	return 0;
}

static int ps3flash_writeback(struct ps3_storage_device *dev)
{
	struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
	int res;

	if (!priv->dirty || priv->tag < 0)
		return 0;

	res = ps3flash_read_write_sectors(dev, priv->tag, 1);
	if (res)
		return res;

	priv->dirty = false;
	return 0;
}

static int ps3flash_fetch(struct ps3_storage_device *dev, u64 start_sector)
{
	struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
	int res;

	if (start_sector == priv->tag)
		return 0;

	res = ps3flash_writeback(dev);
	if (res)
		return res;

	priv->tag = -1;

	res = ps3flash_read_write_sectors(dev, start_sector, 0);
	if (res)
		return res;

	priv->tag = start_sector;
	return 0;
}

static loff_t ps3flash_llseek(struct file *file, loff_t offset, int origin)
{
	struct ps3_storage_device *dev = ps3flash_dev;
	loff_t res;

	mutex_lock(&file->f_mapping->host->i_mutex);
	switch (origin) {
	case 0:
		break;
	case 1:
		offset += file->f_pos;
		break;
	case 2:
		offset += dev->regions[dev->region_idx].size*dev->blk_size;
		break;
	default:
		offset = -1;
	}
	if (offset < 0) {
		res = -EINVAL;
		goto out;
	}

	file->f_pos = offset;
	res = file->f_pos;

out:
	mutex_unlock(&file->f_mapping->host->i_mutex);
	return res;
}

static ssize_t ps3flash_read(char __user *userbuf, void *kernelbuf,
			     size_t count, loff_t *pos)
{
	struct ps3_storage_device *dev = ps3flash_dev;
	struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
	u64 size, sector, offset;
	int res;
	size_t remaining, n;
	const void *src;

	dev_dbg(&dev->sbd.core,
		"%s:%u: Reading %zu bytes at position %lld to U0x%p/K0x%p\n",
		__func__, __LINE__, count, *pos, userbuf, kernelbuf);

	size = dev->regions[dev->region_idx].size*dev->blk_size;
	if (*pos >= size || !count)
		return 0;

	if (*pos + count > size) {
		dev_dbg(&dev->sbd.core,
			"%s:%u Truncating count from %zu to %llu\n", __func__,
			__LINE__, count, size - *pos);
		count = size - *pos;
	}

	sector = *pos / dev->bounce_size * priv->chunk_sectors;
	offset = *pos % dev->bounce_size;

	remaining = count;
	do {
		n = min_t(u64, remaining, dev->bounce_size - offset);
		src = dev->bounce_buf + offset;

		mutex_lock(&priv->mutex);

		res = ps3flash_fetch(dev, sector);
		if (res)
			goto fail;

		dev_dbg(&dev->sbd.core,
			"%s:%u: copy %lu bytes from 0x%p to U0x%p/K0x%p\n",
			__func__, __LINE__, n, src, userbuf, kernelbuf);
		if (userbuf) {
			if (copy_to_user(userbuf, src, n)) {
				res = -EFAULT;
				goto fail;
			}
			userbuf += n;
		}
		if (kernelbuf) {
			memcpy(kernelbuf, src, n);
			kernelbuf += n;
		}

		mutex_unlock(&priv->mutex);

		*pos += n;
		remaining -= n;
		sector += priv->chunk_sectors;
		offset = 0;
	} while (remaining > 0);

	return count;

fail:
	mutex_unlock(&priv->mutex);
	return res;
}

static ssize_t ps3flash_write(const char __user *userbuf,
			      const void *kernelbuf, size_t count, loff_t *pos)
{
	struct ps3_storage_device *dev = ps3flash_dev;
	struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
	u64 size, sector, offset;
	int res = 0;
	size_t remaining, n;
	void *dst;

	dev_dbg(&dev->sbd.core,
		"%s:%u: Writing %zu bytes at position %lld from U0x%p/K0x%p\n",
		__func__, __LINE__, count, *pos, userbuf, kernelbuf);

	size = dev->regions[dev->region_idx].size*dev->blk_size;
	if (*pos >= size || !count)
		return 0;

	if (*pos + count > size) {
		dev_dbg(&dev->sbd.core,
			"%s:%u Truncating count from %zu to %llu\n", __func__,
			__LINE__, count, size - *pos);
		count = size - *pos;
	}

	sector = *pos / dev->bounce_size * priv->chunk_sectors;
	offset = *pos % dev->bounce_size;

	remaining = count;
	do {
		n = min_t(u64, remaining, dev->bounce_size - offset);
		dst = dev->bounce_buf + offset;

		mutex_lock(&priv->mutex);

		if (n != dev->bounce_size)
			res = ps3flash_fetch(dev, sector);
		else if (sector != priv->tag)
			res = ps3flash_writeback(dev);
		if (res)
			goto fail;

		dev_dbg(&dev->sbd.core,
			"%s:%u: copy %lu bytes from U0x%p/K0x%p to 0x%p\n",
			__func__, __LINE__, n, userbuf, kernelbuf, dst);
		if (userbuf) {
			if (copy_from_user(dst, userbuf, n)) {
				res = -EFAULT;
				goto fail;
			}
			userbuf += n;
		}
		if (kernelbuf) {
			memcpy(dst, kernelbuf, n);
			kernelbuf += n;
		}

		priv->tag = sector;
		priv->dirty = true;

		mutex_unlock(&priv->mutex);

		*pos += n;
		remaining -= n;
		sector += priv->chunk_sectors;
		offset = 0;
	} while (remaining > 0);

	return count;

fail:
	mutex_unlock(&priv->mutex);
	return res;
}

static ssize_t ps3flash_user_read(struct file *file, char __user *buf,
				  size_t count, loff_t *pos)
{
	return ps3flash_read(buf, NULL, count, pos);
}

static ssize_t ps3flash_user_write(struct file *file, const char __user *buf,
				   size_t count, loff_t *pos)
{
	return ps3flash_write(buf, NULL, count, pos);
}

static ssize_t ps3flash_kernel_read(void *buf, size_t count, loff_t pos)
{
	return ps3flash_read(NULL, buf, count, &pos);
}

static ssize_t ps3flash_kernel_write(const void *buf, size_t count,
				     loff_t pos)
{
	ssize_t res;
	int wb;

	res = ps3flash_write(NULL, buf, count, &pos);
	if (res < 0)
		return res;

	/* Make kernel writes synchronous */
	wb = ps3flash_writeback(ps3flash_dev);
	if (wb)
		return wb;

	return res;
}

static int ps3flash_flush(struct file *file, fl_owner_t id)
{
	return ps3flash_writeback(ps3flash_dev);
}

static int ps3flash_fsync(struct file *file, loff_t start, loff_t end, int datasync)
{
	struct inode *inode = file->f_path.dentry->d_inode;
	int err;
	mutex_lock(&inode->i_mutex);
	err = ps3flash_writeback(ps3flash_dev);
	mutex_unlock(&inode->i_mutex);
	return err;
}

static irqreturn_t ps3flash_interrupt(int irq, void *data)
{
	struct ps3_storage_device *dev = data;
	int res;
	u64 tag, status;

	res = lv1_storage_get_async_status(dev->sbd.dev_id, &tag, &status);

	if (tag != dev->tag)
		dev_err(&dev->sbd.core,
			"%s:%u: tag mismatch, got %llx, expected %llx\n",
			__func__, __LINE__, tag, dev->tag);

	if (res) {
		dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%llx\n",
			__func__, __LINE__, res, status);
	} else {
		dev->lv1_status = status;
		complete(&dev->done);
	}
	return IRQ_HANDLED;
}

static const struct file_operations ps3flash_fops = {
	.owner	= THIS_MODULE,
	.llseek	= ps3flash_llseek,
	.read	= ps3flash_user_read,
	.write	= ps3flash_user_write,
	.flush	= ps3flash_flush,
	.fsync	= ps3flash_fsync,
};

static const struct ps3_os_area_flash_ops ps3flash_kernel_ops = {
	.read	= ps3flash_kernel_read,
	.write	= ps3flash_kernel_write,
};

static struct miscdevice ps3flash_misc = {
	.minor	= MISC_DYNAMIC_MINOR,
	.name	= DEVICE_NAME,
	.fops	= &ps3flash_fops,
};

static int __devinit ps3flash_probe(struct ps3_system_bus_device *_dev)
{
	struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
	struct ps3flash_private *priv;
	int error;
	unsigned long tmp;

	tmp = dev->regions[dev->region_idx].start*dev->blk_size;
	if (tmp % FLASH_BLOCK_SIZE) {
		dev_err(&dev->sbd.core,
			"%s:%u region start %lu is not aligned\n", __func__,
			__LINE__, tmp);
		return -EINVAL;
	}
	tmp = dev->regions[dev->region_idx].size*dev->blk_size;
	if (tmp % FLASH_BLOCK_SIZE) {
		dev_err(&dev->sbd.core,
			"%s:%u region size %lu is not aligned\n", __func__,
			__LINE__, tmp);
		return -EINVAL;
	}

	/* use static buffer, kmalloc cannot allocate 256 KiB */
	if (!ps3flash_bounce_buffer.address)
		return -ENODEV;

	if (ps3flash_dev) {
		dev_err(&dev->sbd.core,
			"Only one FLASH device is supported\n");
		return -EBUSY;
	}

	ps3flash_dev = dev;

	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	if (!priv) {
		error = -ENOMEM;
		goto fail;
	}

	ps3_system_bus_set_drvdata(&dev->sbd, priv);
	mutex_init(&priv->mutex);
	priv->tag = -1;

	dev->bounce_size = ps3flash_bounce_buffer.size;
	dev->bounce_buf = ps3flash_bounce_buffer.address;
	priv->chunk_sectors = dev->bounce_size / dev->blk_size;

	error = ps3stor_setup(dev, ps3flash_interrupt);
	if (error)
		goto fail_free_priv;

	ps3flash_misc.parent = &dev->sbd.core;
	error = misc_register(&ps3flash_misc);
	if (error) {
		dev_err(&dev->sbd.core, "%s:%u: misc_register failed %d\n",
			__func__, __LINE__, error);
		goto fail_teardown;
	}

	dev_info(&dev->sbd.core, "%s:%u: registered misc device %d\n",
		 __func__, __LINE__, ps3flash_misc.minor);

	ps3_os_area_flash_register(&ps3flash_kernel_ops);
	return 0;

fail_teardown:
	ps3stor_teardown(dev);
fail_free_priv:
	kfree(priv);
	ps3_system_bus_set_drvdata(&dev->sbd, NULL);
fail:
	ps3flash_dev = NULL;
	return error;
}

static int ps3flash_remove(struct ps3_system_bus_device *_dev)
{
	struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);

	ps3_os_area_flash_register(NULL);
	misc_deregister(&ps3flash_misc);
	ps3stor_teardown(dev);
	kfree(ps3_system_bus_get_drvdata(&dev->sbd));
	ps3_system_bus_set_drvdata(&dev->sbd, NULL);
	ps3flash_dev = NULL;
	return 0;
}


static struct ps3_system_bus_driver ps3flash = {
	.match_id	= PS3_MATCH_ID_STOR_FLASH,
	.core.name	= DEVICE_NAME,
	.core.owner	= THIS_MODULE,
	.probe		= ps3flash_probe,
	.remove		= ps3flash_remove,
	.shutdown	= ps3flash_remove,
};


static int __init ps3flash_init(void)
{
	return ps3_system_bus_driver_register(&ps3flash);
}

static void __exit ps3flash_exit(void)
{
	ps3_system_bus_driver_unregister(&ps3flash);
}

module_init(ps3flash_init);
module_exit(ps3flash_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("PS3 FLASH ROM Storage Driver");
MODULE_AUTHOR("Sony Corporation");
MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_FLASH);