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21#include <linux/fs.h>
22#include <linux/miscdevice.h>
23#include <linux/slab.h>
24#include <linux/uaccess.h>
25#include <linux/module.h>
26
27#include <asm/lv1call.h>
28#include <asm/ps3stor.h>
29
30
31#define DEVICE_NAME "ps3flash"
32
33#define FLASH_BLOCK_SIZE (256*1024)
34
35
36struct ps3flash_private {
37 struct mutex mutex;
38 u64 chunk_sectors;
39 int tag;
40 bool dirty;
41};
42
43static struct ps3_storage_device *ps3flash_dev;
44
45static int ps3flash_read_write_sectors(struct ps3_storage_device *dev,
46 u64 start_sector, int write)
47{
48 struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
49 u64 res = ps3stor_read_write_sectors(dev, dev->bounce_lpar,
50 start_sector, priv->chunk_sectors,
51 write);
52 if (res) {
53 dev_err(&dev->sbd.core, "%s:%u: %s failed 0x%llx\n", __func__,
54 __LINE__, write ? "write" : "read", res);
55 return -EIO;
56 }
57 return 0;
58}
59
60static int ps3flash_writeback(struct ps3_storage_device *dev)
61{
62 struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
63 int res;
64
65 if (!priv->dirty || priv->tag < 0)
66 return 0;
67
68 res = ps3flash_read_write_sectors(dev, priv->tag, 1);
69 if (res)
70 return res;
71
72 priv->dirty = false;
73 return 0;
74}
75
76static int ps3flash_fetch(struct ps3_storage_device *dev, u64 start_sector)
77{
78 struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
79 int res;
80
81 if (start_sector == priv->tag)
82 return 0;
83
84 res = ps3flash_writeback(dev);
85 if (res)
86 return res;
87
88 priv->tag = -1;
89
90 res = ps3flash_read_write_sectors(dev, start_sector, 0);
91 if (res)
92 return res;
93
94 priv->tag = start_sector;
95 return 0;
96}
97
98static loff_t ps3flash_llseek(struct file *file, loff_t offset, int origin)
99{
100 struct ps3_storage_device *dev = ps3flash_dev;
101 return generic_file_llseek_size(file, offset, origin, MAX_LFS_FILESIZE,
102 dev->regions[dev->region_idx].size*dev->blk_size);
103}
104
105static ssize_t ps3flash_read(char __user *userbuf, void *kernelbuf,
106 size_t count, loff_t *pos)
107{
108 struct ps3_storage_device *dev = ps3flash_dev;
109 struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
110 u64 size, sector, offset;
111 int res;
112 size_t remaining, n;
113 const void *src;
114
115 dev_dbg(&dev->sbd.core,
116 "%s:%u: Reading %zu bytes at position %lld to U0x%p/K0x%p\n",
117 __func__, __LINE__, count, *pos, userbuf, kernelbuf);
118
119 size = dev->regions[dev->region_idx].size*dev->blk_size;
120 if (*pos >= size || !count)
121 return 0;
122
123 if (*pos + count > size) {
124 dev_dbg(&dev->sbd.core,
125 "%s:%u Truncating count from %zu to %llu\n", __func__,
126 __LINE__, count, size - *pos);
127 count = size - *pos;
128 }
129
130 sector = *pos / dev->bounce_size * priv->chunk_sectors;
131 offset = *pos % dev->bounce_size;
132
133 remaining = count;
134 do {
135 n = min_t(u64, remaining, dev->bounce_size - offset);
136 src = dev->bounce_buf + offset;
137
138 mutex_lock(&priv->mutex);
139
140 res = ps3flash_fetch(dev, sector);
141 if (res)
142 goto fail;
143
144 dev_dbg(&dev->sbd.core,
145 "%s:%u: copy %lu bytes from 0x%p to U0x%p/K0x%p\n",
146 __func__, __LINE__, n, src, userbuf, kernelbuf);
147 if (userbuf) {
148 if (copy_to_user(userbuf, src, n)) {
149 res = -EFAULT;
150 goto fail;
151 }
152 userbuf += n;
153 }
154 if (kernelbuf) {
155 memcpy(kernelbuf, src, n);
156 kernelbuf += n;
157 }
158
159 mutex_unlock(&priv->mutex);
160
161 *pos += n;
162 remaining -= n;
163 sector += priv->chunk_sectors;
164 offset = 0;
165 } while (remaining > 0);
166
167 return count;
168
169fail:
170 mutex_unlock(&priv->mutex);
171 return res;
172}
173
174static ssize_t ps3flash_write(const char __user *userbuf,
175 const void *kernelbuf, size_t count, loff_t *pos)
176{
177 struct ps3_storage_device *dev = ps3flash_dev;
178 struct ps3flash_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
179 u64 size, sector, offset;
180 int res = 0;
181 size_t remaining, n;
182 void *dst;
183
184 dev_dbg(&dev->sbd.core,
185 "%s:%u: Writing %zu bytes at position %lld from U0x%p/K0x%p\n",
186 __func__, __LINE__, count, *pos, userbuf, kernelbuf);
187
188 size = dev->regions[dev->region_idx].size*dev->blk_size;
189 if (*pos >= size || !count)
190 return 0;
191
192 if (*pos + count > size) {
193 dev_dbg(&dev->sbd.core,
194 "%s:%u Truncating count from %zu to %llu\n", __func__,
195 __LINE__, count, size - *pos);
196 count = size - *pos;
197 }
198
199 sector = *pos / dev->bounce_size * priv->chunk_sectors;
200 offset = *pos % dev->bounce_size;
201
202 remaining = count;
203 do {
204 n = min_t(u64, remaining, dev->bounce_size - offset);
205 dst = dev->bounce_buf + offset;
206
207 mutex_lock(&priv->mutex);
208
209 if (n != dev->bounce_size)
210 res = ps3flash_fetch(dev, sector);
211 else if (sector != priv->tag)
212 res = ps3flash_writeback(dev);
213 if (res)
214 goto fail;
215
216 dev_dbg(&dev->sbd.core,
217 "%s:%u: copy %lu bytes from U0x%p/K0x%p to 0x%p\n",
218 __func__, __LINE__, n, userbuf, kernelbuf, dst);
219 if (userbuf) {
220 if (copy_from_user(dst, userbuf, n)) {
221 res = -EFAULT;
222 goto fail;
223 }
224 userbuf += n;
225 }
226 if (kernelbuf) {
227 memcpy(dst, kernelbuf, n);
228 kernelbuf += n;
229 }
230
231 priv->tag = sector;
232 priv->dirty = true;
233
234 mutex_unlock(&priv->mutex);
235
236 *pos += n;
237 remaining -= n;
238 sector += priv->chunk_sectors;
239 offset = 0;
240 } while (remaining > 0);
241
242 return count;
243
244fail:
245 mutex_unlock(&priv->mutex);
246 return res;
247}
248
249static ssize_t ps3flash_user_read(struct file *file, char __user *buf,
250 size_t count, loff_t *pos)
251{
252 return ps3flash_read(buf, NULL, count, pos);
253}
254
255static ssize_t ps3flash_user_write(struct file *file, const char __user *buf,
256 size_t count, loff_t *pos)
257{
258 return ps3flash_write(buf, NULL, count, pos);
259}
260
261static ssize_t ps3flash_kernel_read(void *buf, size_t count, loff_t pos)
262{
263 return ps3flash_read(NULL, buf, count, &pos);
264}
265
266static ssize_t ps3flash_kernel_write(const void *buf, size_t count,
267 loff_t pos)
268{
269 ssize_t res;
270 int wb;
271
272 res = ps3flash_write(NULL, buf, count, &pos);
273 if (res < 0)
274 return res;
275
276
277 wb = ps3flash_writeback(ps3flash_dev);
278 if (wb)
279 return wb;
280
281 return res;
282}
283
284static int ps3flash_flush(struct file *file, fl_owner_t id)
285{
286 return ps3flash_writeback(ps3flash_dev);
287}
288
289static int ps3flash_fsync(struct file *file, loff_t start, loff_t end, int datasync)
290{
291 struct inode *inode = file_inode(file);
292 int err;
293 mutex_lock(&inode->i_mutex);
294 err = ps3flash_writeback(ps3flash_dev);
295 mutex_unlock(&inode->i_mutex);
296 return err;
297}
298
299static irqreturn_t ps3flash_interrupt(int irq, void *data)
300{
301 struct ps3_storage_device *dev = data;
302 int res;
303 u64 tag, status;
304
305 res = lv1_storage_get_async_status(dev->sbd.dev_id, &tag, &status);
306
307 if (tag != dev->tag)
308 dev_err(&dev->sbd.core,
309 "%s:%u: tag mismatch, got %llx, expected %llx\n",
310 __func__, __LINE__, tag, dev->tag);
311
312 if (res) {
313 dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%llx\n",
314 __func__, __LINE__, res, status);
315 } else {
316 dev->lv1_status = status;
317 complete(&dev->done);
318 }
319 return IRQ_HANDLED;
320}
321
322static const struct file_operations ps3flash_fops = {
323 .owner = THIS_MODULE,
324 .llseek = ps3flash_llseek,
325 .read = ps3flash_user_read,
326 .write = ps3flash_user_write,
327 .flush = ps3flash_flush,
328 .fsync = ps3flash_fsync,
329};
330
331static const struct ps3_os_area_flash_ops ps3flash_kernel_ops = {
332 .read = ps3flash_kernel_read,
333 .write = ps3flash_kernel_write,
334};
335
336static struct miscdevice ps3flash_misc = {
337 .minor = MISC_DYNAMIC_MINOR,
338 .name = DEVICE_NAME,
339 .fops = &ps3flash_fops,
340};
341
342static int ps3flash_probe(struct ps3_system_bus_device *_dev)
343{
344 struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
345 struct ps3flash_private *priv;
346 int error;
347 unsigned long tmp;
348
349 tmp = dev->regions[dev->region_idx].start*dev->blk_size;
350 if (tmp % FLASH_BLOCK_SIZE) {
351 dev_err(&dev->sbd.core,
352 "%s:%u region start %lu is not aligned\n", __func__,
353 __LINE__, tmp);
354 return -EINVAL;
355 }
356 tmp = dev->regions[dev->region_idx].size*dev->blk_size;
357 if (tmp % FLASH_BLOCK_SIZE) {
358 dev_err(&dev->sbd.core,
359 "%s:%u region size %lu is not aligned\n", __func__,
360 __LINE__, tmp);
361 return -EINVAL;
362 }
363
364
365 if (!ps3flash_bounce_buffer.address)
366 return -ENODEV;
367
368 if (ps3flash_dev) {
369 dev_err(&dev->sbd.core,
370 "Only one FLASH device is supported\n");
371 return -EBUSY;
372 }
373
374 ps3flash_dev = dev;
375
376 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
377 if (!priv) {
378 error = -ENOMEM;
379 goto fail;
380 }
381
382 ps3_system_bus_set_drvdata(&dev->sbd, priv);
383 mutex_init(&priv->mutex);
384 priv->tag = -1;
385
386 dev->bounce_size = ps3flash_bounce_buffer.size;
387 dev->bounce_buf = ps3flash_bounce_buffer.address;
388 priv->chunk_sectors = dev->bounce_size / dev->blk_size;
389
390 error = ps3stor_setup(dev, ps3flash_interrupt);
391 if (error)
392 goto fail_free_priv;
393
394 ps3flash_misc.parent = &dev->sbd.core;
395 error = misc_register(&ps3flash_misc);
396 if (error) {
397 dev_err(&dev->sbd.core, "%s:%u: misc_register failed %d\n",
398 __func__, __LINE__, error);
399 goto fail_teardown;
400 }
401
402 dev_info(&dev->sbd.core, "%s:%u: registered misc device %d\n",
403 __func__, __LINE__, ps3flash_misc.minor);
404
405 ps3_os_area_flash_register(&ps3flash_kernel_ops);
406 return 0;
407
408fail_teardown:
409 ps3stor_teardown(dev);
410fail_free_priv:
411 kfree(priv);
412 ps3_system_bus_set_drvdata(&dev->sbd, NULL);
413fail:
414 ps3flash_dev = NULL;
415 return error;
416}
417
418static int ps3flash_remove(struct ps3_system_bus_device *_dev)
419{
420 struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
421
422 ps3_os_area_flash_register(NULL);
423 misc_deregister(&ps3flash_misc);
424 ps3stor_teardown(dev);
425 kfree(ps3_system_bus_get_drvdata(&dev->sbd));
426 ps3_system_bus_set_drvdata(&dev->sbd, NULL);
427 ps3flash_dev = NULL;
428 return 0;
429}
430
431
432static struct ps3_system_bus_driver ps3flash = {
433 .match_id = PS3_MATCH_ID_STOR_FLASH,
434 .core.name = DEVICE_NAME,
435 .core.owner = THIS_MODULE,
436 .probe = ps3flash_probe,
437 .remove = ps3flash_remove,
438 .shutdown = ps3flash_remove,
439};
440
441
442static int __init ps3flash_init(void)
443{
444 return ps3_system_bus_driver_register(&ps3flash);
445}
446
447static void __exit ps3flash_exit(void)
448{
449 ps3_system_bus_driver_unregister(&ps3flash);
450}
451
452module_init(ps3flash_init);
453module_exit(ps3flash_exit);
454
455MODULE_LICENSE("GPL");
456MODULE_DESCRIPTION("PS3 FLASH ROM Storage Driver");
457MODULE_AUTHOR("Sony Corporation");
458MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_FLASH);
459
