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authorGeert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>2007-07-21 07:37:48 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-21 20:49:16 -0400
commitf96526354bb0824f3ce550a028606d2f94435b92 (patch)
tree9bc2730a69a4b3fba1750e75e7d6ee6474e6f6b2 /drivers/char/ps3flash.c
parent9aea8cbf2866c5680e30ff473341b7c5e93f7442 (diff)
ps3: FLASH ROM Storage Driver
Add a FLASH ROM Storage Driver for the PS3: - Implemented as a misc character device driver - Uses a fixed 256 KiB buffer allocated from boot memory as the hypervisor requires the writing of aligned 256 KiB blocks Cc: Geoff Levand <geoffrey.levand@am.sony.com> Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com> Cc: Jens Axboe <jens.axboe@oracle.com> Cc: James Bottomley <James.Bottomley@steeleye.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/char/ps3flash.c')
-rw-r--r--drivers/char/ps3flash.c440
1 files changed, 440 insertions, 0 deletions
diff --git a/drivers/char/ps3flash.c b/drivers/char/ps3flash.c
new file mode 100644
index 000000000000..79b6f461be75
--- /dev/null
+++ b/drivers/char/ps3flash.c
@@ -0,0 +1,440 @@
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
34struct ps3flash_private {
35 struct mutex mutex; /* Bounce buffer mutex */
36};
37
38static struct ps3_storage_device *ps3flash_dev;
39
40static ssize_t ps3flash_read_write_sectors(struct ps3_storage_device *dev,
41 u64 lpar, u64 start_sector,
42 u64 sectors, int write)
43{
44 u64 res = ps3stor_read_write_sectors(dev, lpar, start_sector, sectors,
45 write);
46 if (res) {
47 dev_err(&dev->sbd.core, "%s:%u: %s failed 0x%lx\n", __func__,
48 __LINE__, write ? "write" : "read", res);
49 return -EIO;
50 }
51 return sectors;
52}
53
54static ssize_t ps3flash_read_sectors(struct ps3_storage_device *dev,
55 u64 start_sector, u64 sectors,
56 unsigned int sector_offset)
57{
58 u64 max_sectors, lpar;
59
60 max_sectors = dev->bounce_size / dev->blk_size;
61 if (sectors > max_sectors) {
62 dev_dbg(&dev->sbd.core, "%s:%u Limiting sectors to %lu\n",
63 __func__, __LINE__, max_sectors);
64 sectors = max_sectors;
65 }
66
67 lpar = dev->bounce_lpar + sector_offset * dev->blk_size;
68 return ps3flash_read_write_sectors(dev, lpar, start_sector, sectors,
69 0);
70}
71
72static ssize_t ps3flash_write_chunk(struct ps3_storage_device *dev,
73 u64 start_sector)
74{
75 u64 sectors = dev->bounce_size / dev->blk_size;
76 return ps3flash_read_write_sectors(dev, dev->bounce_lpar, start_sector,
77 sectors, 1);
78}
79
80static loff_t ps3flash_llseek(struct file *file, loff_t offset, int origin)
81{
82 struct ps3_storage_device *dev = ps3flash_dev;
83 loff_t res;
84
85 mutex_lock(&file->f_mapping->host->i_mutex);
86 switch (origin) {
87 case 1:
88 offset += file->f_pos;
89 break;
90 case 2:
91 offset += dev->regions[dev->region_idx].size*dev->blk_size;
92 break;
93 }
94 if (offset < 0) {
95 res = -EINVAL;
96 goto out;
97 }
98
99 file->f_pos = offset;
100 res = file->f_pos;
101
102out:
103 mutex_unlock(&file->f_mapping->host->i_mutex);
104 return res;
105}
106
107static ssize_t ps3flash_read(struct file *file, char __user *buf, size_t count,
108 loff_t *pos)
109{
110 struct ps3_storage_device *dev = ps3flash_dev;
111 struct ps3flash_private *priv = dev->sbd.core.driver_data;
112 u64 size, start_sector, end_sector, offset;
113 ssize_t sectors_read;
114 size_t remaining, n;
115
116 dev_dbg(&dev->sbd.core,
117 "%s:%u: Reading %zu bytes at position %lld to user 0x%p\n",
118 __func__, __LINE__, count, *pos, buf);
119
120 size = dev->regions[dev->region_idx].size*dev->blk_size;
121 if (*pos >= size || !count)
122 return 0;
123
124 if (*pos + count > size) {
125 dev_dbg(&dev->sbd.core,
126 "%s:%u Truncating count from %zu to %llu\n", __func__,
127 __LINE__, count, size - *pos);
128 count = size - *pos;
129 }
130
131 start_sector = *pos / dev->blk_size;
132 offset = *pos % dev->blk_size;
133 end_sector = DIV_ROUND_UP(*pos + count, dev->blk_size);
134
135 remaining = count;
136 do {
137 mutex_lock(&priv->mutex);
138
139 sectors_read = ps3flash_read_sectors(dev, start_sector,
140 end_sector-start_sector,
141 0);
142 if (sectors_read < 0) {
143 mutex_unlock(&priv->mutex);
144 goto fail;
145 }
146
147 n = min(remaining, sectors_read*dev->blk_size-offset);
148 dev_dbg(&dev->sbd.core,
149 "%s:%u: copy %lu bytes from 0x%p to user 0x%p\n",
150 __func__, __LINE__, n, dev->bounce_buf+offset, buf);
151 if (copy_to_user(buf, dev->bounce_buf+offset, n)) {
152 mutex_unlock(&priv->mutex);
153 sectors_read = -EFAULT;
154 goto fail;
155 }
156
157 mutex_unlock(&priv->mutex);
158
159 *pos += n;
160 buf += n;
161 remaining -= n;
162 start_sector += sectors_read;
163 offset = 0;
164 } while (remaining > 0);
165
166 return count;
167
168fail:
169 return sectors_read;
170}
171
172static ssize_t ps3flash_write(struct file *file, const char __user *buf,
173 size_t count, loff_t *pos)
174{
175 struct ps3_storage_device *dev = ps3flash_dev;
176 struct ps3flash_private *priv = dev->sbd.core.driver_data;
177 u64 size, chunk_sectors, start_write_sector, end_write_sector,
178 end_read_sector, start_read_sector, head, tail, offset;
179 ssize_t res;
180 size_t remaining, n;
181 unsigned int sec_off;
182
183 dev_dbg(&dev->sbd.core,
184 "%s:%u: Writing %zu bytes at position %lld from user 0x%p\n",
185 __func__, __LINE__, count, *pos, buf);
186
187 size = dev->regions[dev->region_idx].size*dev->blk_size;
188 if (*pos >= size || !count)
189 return 0;
190
191 if (*pos + count > size) {
192 dev_dbg(&dev->sbd.core,
193 "%s:%u Truncating count from %zu to %llu\n", __func__,
194 __LINE__, count, size - *pos);
195 count = size - *pos;
196 }
197
198 chunk_sectors = dev->bounce_size / dev->blk_size;
199
200 start_write_sector = *pos / dev->bounce_size * chunk_sectors;
201 offset = *pos % dev->bounce_size;
202 end_write_sector = DIV_ROUND_UP(*pos + count, dev->bounce_size) *
203 chunk_sectors;
204
205 end_read_sector = DIV_ROUND_UP(*pos, dev->blk_size);
206 start_read_sector = (*pos + count) / dev->blk_size;
207
208 /*
209 * As we have to write in 256 KiB chunks, while we can read in blk_size
210 * (usually 512 bytes) chunks, we perform the following steps:
211 * 1. Read from start_write_sector to end_read_sector ("head")
212 * 2. Read from start_read_sector to end_write_sector ("tail")
213 * 3. Copy data to buffer
214 * 4. Write from start_write_sector to end_write_sector
215 * All of this is complicated by using only one 256 KiB bounce buffer.
216 */
217
218 head = end_read_sector - start_write_sector;
219 tail = end_write_sector - start_read_sector;
220
221 remaining = count;
222 do {
223 mutex_lock(&priv->mutex);
224
225 if (end_read_sector >= start_read_sector) {
226 /* Merge head and tail */
227 dev_dbg(&dev->sbd.core,
228 "Merged head and tail: %lu sectors at %lu\n",
229 chunk_sectors, start_write_sector);
230 res = ps3flash_read_sectors(dev, start_write_sector,
231 chunk_sectors, 0);
232 if (res < 0)
233 goto fail;
234 } else {
235 if (head) {
236 /* Read head */
237 dev_dbg(&dev->sbd.core,
238 "head: %lu sectors at %lu\n", head,
239 start_write_sector);
240 res = ps3flash_read_sectors(dev,
241 start_write_sector,
242 head, 0);
243 if (res < 0)
244 goto fail;
245 }
246 if (start_read_sector <
247 start_write_sector+chunk_sectors) {
248 /* Read tail */
249 dev_dbg(&dev->sbd.core,
250 "tail: %lu sectors at %lu\n", tail,
251 start_read_sector);
252 sec_off = start_read_sector-start_write_sector;
253 res = ps3flash_read_sectors(dev,
254 start_read_sector,
255 tail, sec_off);
256 if (res < 0)
257 goto fail;
258 }
259 }
260
261 n = min(remaining, dev->bounce_size-offset);
262 dev_dbg(&dev->sbd.core,
263 "%s:%u: copy %lu bytes from user 0x%p to 0x%p\n",
264 __func__, __LINE__, n, buf, dev->bounce_buf+offset);
265 if (copy_from_user(dev->bounce_buf+offset, buf, n)) {
266 res = -EFAULT;
267 goto fail;
268 }
269
270 res = ps3flash_write_chunk(dev, start_write_sector);
271 if (res < 0)
272 goto fail;
273
274 mutex_unlock(&priv->mutex);
275
276 *pos += n;
277 buf += n;
278 remaining -= n;
279 start_write_sector += chunk_sectors;
280 head = 0;
281 offset = 0;
282 } while (remaining > 0);
283
284 return count;
285
286fail:
287 mutex_unlock(&priv->mutex);
288 return res;
289}
290
291
292static irqreturn_t ps3flash_interrupt(int irq, void *data)
293{
294 struct ps3_storage_device *dev = data;
295 int res;
296 u64 tag, status;
297
298 res = lv1_storage_get_async_status(dev->sbd.dev_id, &tag, &status);
299
300 if (tag != dev->tag)
301 dev_err(&dev->sbd.core,
302 "%s:%u: tag mismatch, got %lx, expected %lx\n",
303 __func__, __LINE__, tag, dev->tag);
304
305 if (res) {
306 dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%lx\n",
307 __func__, __LINE__, res, status);
308 } else {
309 dev->lv1_status = status;
310 complete(&dev->done);
311 }
312 return IRQ_HANDLED;
313}
314
315
316static const struct file_operations ps3flash_fops = {
317 .owner = THIS_MODULE,
318 .llseek = ps3flash_llseek,
319 .read = ps3flash_read,
320 .write = ps3flash_write,
321};
322
323static struct miscdevice ps3flash_misc = {
324 .minor = MISC_DYNAMIC_MINOR,
325 .name = DEVICE_NAME,
326 .fops = &ps3flash_fops,
327};
328
329static int __devinit ps3flash_probe(struct ps3_system_bus_device *_dev)
330{
331 struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
332 struct ps3flash_private *priv;
333 int error;
334 unsigned long tmp;
335
336 tmp = dev->regions[dev->region_idx].start*dev->blk_size;
337 if (tmp % FLASH_BLOCK_SIZE) {
338 dev_err(&dev->sbd.core,
339 "%s:%u region start %lu is not aligned\n", __func__,
340 __LINE__, tmp);
341 return -EINVAL;
342 }
343 tmp = dev->regions[dev->region_idx].size*dev->blk_size;
344 if (tmp % FLASH_BLOCK_SIZE) {
345 dev_err(&dev->sbd.core,
346 "%s:%u region size %lu is not aligned\n", __func__,
347 __LINE__, tmp);
348 return -EINVAL;
349 }
350
351 /* use static buffer, kmalloc cannot allocate 256 KiB */
352 if (!ps3flash_bounce_buffer.address)
353 return -ENODEV;
354
355 if (ps3flash_dev) {
356 dev_err(&dev->sbd.core,
357 "Only one FLASH device is supported\n");
358 return -EBUSY;
359 }
360
361 ps3flash_dev = dev;
362
363 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
364 if (!priv) {
365 error = -ENOMEM;
366 goto fail;
367 }
368
369 dev->sbd.core.driver_data = priv;
370 mutex_init(&priv->mutex);
371
372 dev->bounce_size = ps3flash_bounce_buffer.size;
373 dev->bounce_buf = ps3flash_bounce_buffer.address;
374
375 error = ps3stor_setup(dev, ps3flash_interrupt);
376 if (error)
377 goto fail_free_priv;
378
379 ps3flash_misc.parent = &dev->sbd.core;
380 error = misc_register(&ps3flash_misc);
381 if (error) {
382 dev_err(&dev->sbd.core, "%s:%u: misc_register failed %d\n",
383 __func__, __LINE__, error);
384 goto fail_teardown;
385 }
386
387 dev_info(&dev->sbd.core, "%s:%u: registered misc device %d\n",
388 __func__, __LINE__, ps3flash_misc.minor);
389 return 0;
390
391fail_teardown:
392 ps3stor_teardown(dev);
393fail_free_priv:
394 kfree(priv);
395 dev->sbd.core.driver_data = NULL;
396fail:
397 ps3flash_dev = NULL;
398 return error;
399}
400
401static int ps3flash_remove(struct ps3_system_bus_device *_dev)
402{
403 struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
404
405 misc_deregister(&ps3flash_misc);
406 ps3stor_teardown(dev);
407 kfree(dev->sbd.core.driver_data);
408 dev->sbd.core.driver_data = NULL;
409 ps3flash_dev = NULL;
410 return 0;
411}
412
413
414static struct ps3_system_bus_driver ps3flash = {
415 .match_id = PS3_MATCH_ID_STOR_FLASH,
416 .core.name = DEVICE_NAME,
417 .core.owner = THIS_MODULE,
418 .probe = ps3flash_probe,
419 .remove = ps3flash_remove,
420 .shutdown = ps3flash_remove,
421};
422
423
424static int __init ps3flash_init(void)
425{
426 return ps3_system_bus_driver_register(&ps3flash);
427}
428
429static void __exit ps3flash_exit(void)
430{
431 ps3_system_bus_driver_unregister(&ps3flash);
432}
433
434module_init(ps3flash_init);
435module_exit(ps3flash_exit);
436
437MODULE_LICENSE("GPL");
438MODULE_DESCRIPTION("PS3 FLASH ROM Storage Driver");
439MODULE_AUTHOR("Sony Corporation");
440MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_FLASH);