ps3disk: Remove superfluous cast
[linux-2.6.git] / drivers / block / ps3disk.c
1 /*
2  * PS3 Disk 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/ata.h>
22 #include <linux/blkdev.h>
23
24 #include <asm/lv1call.h>
25 #include <asm/ps3stor.h>
26 #include <asm/firmware.h>
27
28
29 #define DEVICE_NAME             "ps3disk"
30
31 #define BOUNCE_SIZE             (64*1024)
32
33 #define PS3DISK_MAX_DISKS       16
34 #define PS3DISK_MINORS          16
35
36
37 #define PS3DISK_NAME            "ps3d%c"
38
39
40 struct ps3disk_private {
41         spinlock_t lock;                /* Request queue spinlock */
42         struct request_queue *queue;
43         struct gendisk *gendisk;
44         unsigned int blocking_factor;
45         struct request *req;
46         u64 raw_capacity;
47         unsigned char model[ATA_ID_PROD_LEN+1];
48 };
49
50
51 #define LV1_STORAGE_SEND_ATA_COMMAND    (2)
52 #define LV1_STORAGE_ATA_HDDOUT          (0x23)
53
54 struct lv1_ata_cmnd_block {
55         u16     features;
56         u16     sector_count;
57         u16     LBA_low;
58         u16     LBA_mid;
59         u16     LBA_high;
60         u8      device;
61         u8      command;
62         u32     is_ext;
63         u32     proto;
64         u32     in_out;
65         u32     size;
66         u64     buffer;
67         u32     arglen;
68 };
69
70 enum lv1_ata_proto {
71         NON_DATA_PROTO     = 0,
72         PIO_DATA_IN_PROTO  = 1,
73         PIO_DATA_OUT_PROTO = 2,
74         DMA_PROTO = 3
75 };
76
77 enum lv1_ata_in_out {
78         DIR_WRITE = 0,                  /* memory -> device */
79         DIR_READ = 1                    /* device -> memory */
80 };
81
82 static int ps3disk_major;
83
84
85 static struct block_device_operations ps3disk_fops = {
86         .owner          = THIS_MODULE,
87 };
88
89
90 static void ps3disk_scatter_gather(struct ps3_storage_device *dev,
91                                    struct request *req, int gather)
92 {
93         unsigned int offset = 0;
94         struct req_iterator iter;
95         struct bio_vec *bvec;
96         unsigned int i = 0;
97         size_t size;
98         void *buf;
99
100         rq_for_each_segment(bvec, req, iter) {
101                 unsigned long flags;
102                 dev_dbg(&dev->sbd.core,
103                         "%s:%u: bio %u: %u segs %u sectors from %lu\n",
104                         __func__, __LINE__, i, bio_segments(iter.bio),
105                         bio_sectors(iter.bio), iter.bio->bi_sector);
106
107                 size = bvec->bv_len;
108                 buf = bvec_kmap_irq(bvec, &flags);
109                 if (gather)
110                         memcpy(dev->bounce_buf+offset, buf, size);
111                 else
112                         memcpy(buf, dev->bounce_buf+offset, size);
113                 offset += size;
114                 flush_kernel_dcache_page(bvec->bv_page);
115                 bvec_kunmap_irq(bvec, &flags);
116                 i++;
117         }
118 }
119
120 static int ps3disk_submit_request_sg(struct ps3_storage_device *dev,
121                                      struct request *req)
122 {
123         struct ps3disk_private *priv = dev->sbd.core.driver_data;
124         int write = rq_data_dir(req), res;
125         const char *op = write ? "write" : "read";
126         u64 start_sector, sectors;
127         unsigned int region_id = dev->regions[dev->region_idx].id;
128
129 #ifdef DEBUG
130         unsigned int n = 0;
131         struct bio_vec *bv;
132         struct req_iterator iter;
133
134         rq_for_each_segment(bv, req, iter)
135                 n++;
136         dev_dbg(&dev->sbd.core,
137                 "%s:%u: %s req has %u bvecs for %lu sectors %lu hard sectors\n",
138                 __func__, __LINE__, op, n, req->nr_sectors,
139                 req->hard_nr_sectors);
140 #endif
141
142         start_sector = req->sector * priv->blocking_factor;
143         sectors = req->nr_sectors * priv->blocking_factor;
144         dev_dbg(&dev->sbd.core, "%s:%u: %s %lu sectors starting at %lu\n",
145                 __func__, __LINE__, op, sectors, start_sector);
146
147         if (write) {
148                 ps3disk_scatter_gather(dev, req, 1);
149
150                 res = lv1_storage_write(dev->sbd.dev_id, region_id,
151                                         start_sector, sectors, 0,
152                                         dev->bounce_lpar, &dev->tag);
153         } else {
154                 res = lv1_storage_read(dev->sbd.dev_id, region_id,
155                                        start_sector, sectors, 0,
156                                        dev->bounce_lpar, &dev->tag);
157         }
158         if (res) {
159                 dev_err(&dev->sbd.core, "%s:%u: %s failed %d\n", __func__,
160                         __LINE__, op, res);
161                 end_request(req, 0);
162                 return 0;
163         }
164
165         priv->req = req;
166         return 1;
167 }
168
169 static int ps3disk_submit_flush_request(struct ps3_storage_device *dev,
170                                         struct request *req)
171 {
172         struct ps3disk_private *priv = dev->sbd.core.driver_data;
173         u64 res;
174
175         dev_dbg(&dev->sbd.core, "%s:%u: flush request\n", __func__, __LINE__);
176
177         res = lv1_storage_send_device_command(dev->sbd.dev_id,
178                                               LV1_STORAGE_ATA_HDDOUT, 0, 0, 0,
179                                               0, &dev->tag);
180         if (res) {
181                 dev_err(&dev->sbd.core, "%s:%u: sync cache failed 0x%lx\n",
182                         __func__, __LINE__, res);
183                 end_request(req, 0);
184                 return 0;
185         }
186
187         priv->req = req;
188         return 1;
189 }
190
191 static void ps3disk_do_request(struct ps3_storage_device *dev,
192                                struct request_queue *q)
193 {
194         struct request *req;
195
196         dev_dbg(&dev->sbd.core, "%s:%u\n", __func__, __LINE__);
197
198         while ((req = elv_next_request(q))) {
199                 if (blk_fs_request(req)) {
200                         if (ps3disk_submit_request_sg(dev, req))
201                                 break;
202                 } else if (req->cmd_type == REQ_TYPE_FLUSH) {
203                         if (ps3disk_submit_flush_request(dev, req))
204                                 break;
205                 } else {
206                         blk_dump_rq_flags(req, DEVICE_NAME " bad request");
207                         end_request(req, 0);
208                         continue;
209                 }
210         }
211 }
212
213 static void ps3disk_request(struct request_queue *q)
214 {
215         struct ps3_storage_device *dev = q->queuedata;
216         struct ps3disk_private *priv = dev->sbd.core.driver_data;
217
218         if (priv->req) {
219                 dev_dbg(&dev->sbd.core, "%s:%u busy\n", __func__, __LINE__);
220                 return;
221         }
222
223         ps3disk_do_request(dev, q);
224 }
225
226 static irqreturn_t ps3disk_interrupt(int irq, void *data)
227 {
228         struct ps3_storage_device *dev = data;
229         struct ps3disk_private *priv;
230         struct request *req;
231         int res, read, error;
232         u64 tag, status;
233         unsigned long num_sectors;
234         const char *op;
235
236         res = lv1_storage_get_async_status(dev->sbd.dev_id, &tag, &status);
237
238         if (tag != dev->tag)
239                 dev_err(&dev->sbd.core,
240                         "%s:%u: tag mismatch, got %lx, expected %lx\n",
241                         __func__, __LINE__, tag, dev->tag);
242
243         if (res) {
244                 dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%lx\n",
245                         __func__, __LINE__, res, status);
246                 return IRQ_HANDLED;
247         }
248
249         priv = dev->sbd.core.driver_data;
250         req = priv->req;
251         if (!req) {
252                 dev_dbg(&dev->sbd.core,
253                         "%s:%u non-block layer request completed\n", __func__,
254                         __LINE__);
255                 dev->lv1_status = status;
256                 complete(&dev->done);
257                 return IRQ_HANDLED;
258         }
259
260         if (req->cmd_type == REQ_TYPE_FLUSH) {
261                 read = 0;
262                 num_sectors = req->hard_cur_sectors;
263                 op = "flush";
264         } else {
265                 read = !rq_data_dir(req);
266                 num_sectors = req->nr_sectors;
267                 op = read ? "read" : "write";
268         }
269         if (status) {
270                 dev_dbg(&dev->sbd.core, "%s:%u: %s failed 0x%lx\n", __func__,
271                         __LINE__, op, status);
272                 error = -EIO;
273         } else {
274                 dev_dbg(&dev->sbd.core, "%s:%u: %s completed\n", __func__,
275                         __LINE__, op);
276                 error = 0;
277                 if (read)
278                         ps3disk_scatter_gather(dev, req, 0);
279         }
280
281         spin_lock(&priv->lock);
282         __blk_end_request(req, error, num_sectors << 9);
283         priv->req = NULL;
284         ps3disk_do_request(dev, priv->queue);
285         spin_unlock(&priv->lock);
286
287         return IRQ_HANDLED;
288 }
289
290 static int ps3disk_sync_cache(struct ps3_storage_device *dev)
291 {
292         u64 res;
293
294         dev_dbg(&dev->sbd.core, "%s:%u: sync cache\n", __func__, __LINE__);
295
296         res = ps3stor_send_command(dev, LV1_STORAGE_ATA_HDDOUT, 0, 0, 0, 0);
297         if (res) {
298                 dev_err(&dev->sbd.core, "%s:%u: sync cache failed 0x%lx\n",
299                         __func__, __LINE__, res);
300                 return -EIO;
301         }
302         return 0;
303 }
304
305
306 /* ATA helpers copied from drivers/ata/libata-core.c */
307
308 static void swap_buf_le16(u16 *buf, unsigned int buf_words)
309 {
310 #ifdef __BIG_ENDIAN
311         unsigned int i;
312
313         for (i = 0; i < buf_words; i++)
314                 buf[i] = le16_to_cpu(buf[i]);
315 #endif /* __BIG_ENDIAN */
316 }
317
318 static u64 ata_id_n_sectors(const u16 *id)
319 {
320         if (ata_id_has_lba(id)) {
321                 if (ata_id_has_lba48(id))
322                         return ata_id_u64(id, 100);
323                 else
324                         return ata_id_u32(id, 60);
325         } else {
326                 if (ata_id_current_chs_valid(id))
327                         return ata_id_u32(id, 57);
328                 else
329                         return id[1] * id[3] * id[6];
330         }
331 }
332
333 static void ata_id_string(const u16 *id, unsigned char *s, unsigned int ofs,
334                           unsigned int len)
335 {
336         unsigned int c;
337
338         while (len > 0) {
339                 c = id[ofs] >> 8;
340                 *s = c;
341                 s++;
342
343                 c = id[ofs] & 0xff;
344                 *s = c;
345                 s++;
346
347                 ofs++;
348                 len -= 2;
349         }
350 }
351
352 static void ata_id_c_string(const u16 *id, unsigned char *s, unsigned int ofs,
353                             unsigned int len)
354 {
355         unsigned char *p;
356
357         WARN_ON(!(len & 1));
358
359         ata_id_string(id, s, ofs, len - 1);
360
361         p = s + strnlen(s, len - 1);
362         while (p > s && p[-1] == ' ')
363                 p--;
364         *p = '\0';
365 }
366
367 static int ps3disk_identify(struct ps3_storage_device *dev)
368 {
369         struct ps3disk_private *priv = dev->sbd.core.driver_data;
370         struct lv1_ata_cmnd_block ata_cmnd;
371         u16 *id = dev->bounce_buf;
372         u64 res;
373
374         dev_dbg(&dev->sbd.core, "%s:%u: identify disk\n", __func__, __LINE__);
375
376         memset(&ata_cmnd, 0, sizeof(struct lv1_ata_cmnd_block));
377         ata_cmnd.command = ATA_CMD_ID_ATA;
378         ata_cmnd.sector_count = 1;
379         ata_cmnd.size = ata_cmnd.arglen = ATA_ID_WORDS * 2;
380         ata_cmnd.buffer = dev->bounce_lpar;
381         ata_cmnd.proto = PIO_DATA_IN_PROTO;
382         ata_cmnd.in_out = DIR_READ;
383
384         res = ps3stor_send_command(dev, LV1_STORAGE_SEND_ATA_COMMAND,
385                                    ps3_mm_phys_to_lpar(__pa(&ata_cmnd)),
386                                    sizeof(ata_cmnd), ata_cmnd.buffer,
387                                    ata_cmnd.arglen);
388         if (res) {
389                 dev_err(&dev->sbd.core, "%s:%u: identify disk failed 0x%lx\n",
390                         __func__, __LINE__, res);
391                 return -EIO;
392         }
393
394         swap_buf_le16(id, ATA_ID_WORDS);
395
396         /* All we're interested in are raw capacity and model name */
397         priv->raw_capacity = ata_id_n_sectors(id);
398         ata_id_c_string(id, priv->model, ATA_ID_PROD, sizeof(priv->model));
399         return 0;
400 }
401
402 static void ps3disk_prepare_flush(struct request_queue *q, struct request *req)
403 {
404         struct ps3_storage_device *dev = q->queuedata;
405
406         dev_dbg(&dev->sbd.core, "%s:%u\n", __func__, __LINE__);
407
408         memset(req->cmd, 0, sizeof(req->cmd));
409         req->cmd_type = REQ_TYPE_FLUSH;
410 }
411
412 static unsigned long ps3disk_mask;
413
414 static DEFINE_MUTEX(ps3disk_mask_mutex);
415
416 static int __devinit ps3disk_probe(struct ps3_system_bus_device *_dev)
417 {
418         struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
419         struct ps3disk_private *priv;
420         int error;
421         unsigned int devidx;
422         struct request_queue *queue;
423         struct gendisk *gendisk;
424
425         if (dev->blk_size < 512) {
426                 dev_err(&dev->sbd.core,
427                         "%s:%u: cannot handle block size %lu\n", __func__,
428                         __LINE__, dev->blk_size);
429                 return -EINVAL;
430         }
431
432         BUILD_BUG_ON(PS3DISK_MAX_DISKS > BITS_PER_LONG);
433         mutex_lock(&ps3disk_mask_mutex);
434         devidx = find_first_zero_bit(&ps3disk_mask, PS3DISK_MAX_DISKS);
435         if (devidx >= PS3DISK_MAX_DISKS) {
436                 dev_err(&dev->sbd.core, "%s:%u: Too many disks\n", __func__,
437                         __LINE__);
438                 mutex_unlock(&ps3disk_mask_mutex);
439                 return -ENOSPC;
440         }
441         __set_bit(devidx, &ps3disk_mask);
442         mutex_unlock(&ps3disk_mask_mutex);
443
444         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
445         if (!priv) {
446                 error = -ENOMEM;
447                 goto fail;
448         }
449
450         dev->sbd.core.driver_data = priv;
451         spin_lock_init(&priv->lock);
452
453         dev->bounce_size = BOUNCE_SIZE;
454         dev->bounce_buf = kmalloc(BOUNCE_SIZE, GFP_DMA);
455         if (!dev->bounce_buf) {
456                 error = -ENOMEM;
457                 goto fail_free_priv;
458         }
459
460         error = ps3stor_setup(dev, ps3disk_interrupt);
461         if (error)
462                 goto fail_free_bounce;
463
464         ps3disk_identify(dev);
465
466         queue = blk_init_queue(ps3disk_request, &priv->lock);
467         if (!queue) {
468                 dev_err(&dev->sbd.core, "%s:%u: blk_init_queue failed\n",
469                         __func__, __LINE__);
470                 error = -ENOMEM;
471                 goto fail_teardown;
472         }
473
474         priv->queue = queue;
475         queue->queuedata = dev;
476
477         blk_queue_bounce_limit(queue, BLK_BOUNCE_HIGH);
478
479         blk_queue_max_sectors(queue, dev->bounce_size >> 9);
480         blk_queue_segment_boundary(queue, -1UL);
481         blk_queue_dma_alignment(queue, dev->blk_size-1);
482         blk_queue_hardsect_size(queue, dev->blk_size);
483
484         blk_queue_ordered(queue, QUEUE_ORDERED_DRAIN_FLUSH,
485                           ps3disk_prepare_flush);
486
487         blk_queue_max_phys_segments(queue, -1);
488         blk_queue_max_hw_segments(queue, -1);
489         blk_queue_max_segment_size(queue, dev->bounce_size);
490
491         gendisk = alloc_disk(PS3DISK_MINORS);
492         if (!gendisk) {
493                 dev_err(&dev->sbd.core, "%s:%u: alloc_disk failed\n", __func__,
494                         __LINE__);
495                 error = -ENOMEM;
496                 goto fail_cleanup_queue;
497         }
498
499         priv->gendisk = gendisk;
500         gendisk->major = ps3disk_major;
501         gendisk->first_minor = devidx * PS3DISK_MINORS;
502         gendisk->fops = &ps3disk_fops;
503         gendisk->queue = queue;
504         gendisk->private_data = dev;
505         gendisk->driverfs_dev = &dev->sbd.core;
506         snprintf(gendisk->disk_name, sizeof(gendisk->disk_name), PS3DISK_NAME,
507                  devidx+'a');
508         priv->blocking_factor = dev->blk_size >> 9;
509         set_capacity(gendisk,
510                      dev->regions[dev->region_idx].size*priv->blocking_factor);
511
512         dev_info(&dev->sbd.core,
513                  "%s is a %s (%lu MiB total, %lu MiB for OtherOS)\n",
514                  gendisk->disk_name, priv->model, priv->raw_capacity >> 11,
515                  get_capacity(gendisk) >> 11);
516
517         add_disk(gendisk);
518         return 0;
519
520 fail_cleanup_queue:
521         blk_cleanup_queue(queue);
522 fail_teardown:
523         ps3stor_teardown(dev);
524 fail_free_bounce:
525         kfree(dev->bounce_buf);
526 fail_free_priv:
527         kfree(priv);
528         dev->sbd.core.driver_data = NULL;
529 fail:
530         mutex_lock(&ps3disk_mask_mutex);
531         __clear_bit(devidx, &ps3disk_mask);
532         mutex_unlock(&ps3disk_mask_mutex);
533         return error;
534 }
535
536 static int ps3disk_remove(struct ps3_system_bus_device *_dev)
537 {
538         struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
539         struct ps3disk_private *priv = dev->sbd.core.driver_data;
540
541         mutex_lock(&ps3disk_mask_mutex);
542         __clear_bit(priv->gendisk->first_minor / PS3DISK_MINORS,
543                     &ps3disk_mask);
544         mutex_unlock(&ps3disk_mask_mutex);
545         del_gendisk(priv->gendisk);
546         blk_cleanup_queue(priv->queue);
547         put_disk(priv->gendisk);
548         dev_notice(&dev->sbd.core, "Synchronizing disk cache\n");
549         ps3disk_sync_cache(dev);
550         ps3stor_teardown(dev);
551         kfree(dev->bounce_buf);
552         kfree(priv);
553         dev->sbd.core.driver_data = NULL;
554         return 0;
555 }
556
557 static struct ps3_system_bus_driver ps3disk = {
558         .match_id       = PS3_MATCH_ID_STOR_DISK,
559         .core.name      = DEVICE_NAME,
560         .core.owner     = THIS_MODULE,
561         .probe          = ps3disk_probe,
562         .remove         = ps3disk_remove,
563         .shutdown       = ps3disk_remove,
564 };
565
566
567 static int __init ps3disk_init(void)
568 {
569         int error;
570
571         if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
572                 return -ENODEV;
573
574         error = register_blkdev(0, DEVICE_NAME);
575         if (error <= 0) {
576                 printk(KERN_ERR "%s:%u: register_blkdev failed %d\n", __func__,
577                        __LINE__, error);
578                 return error;
579         }
580         ps3disk_major = error;
581
582         pr_info("%s:%u: registered block device major %d\n", __func__,
583                 __LINE__, ps3disk_major);
584
585         error = ps3_system_bus_driver_register(&ps3disk);
586         if (error)
587                 unregister_blkdev(ps3disk_major, DEVICE_NAME);
588
589         return error;
590 }
591
592 static void __exit ps3disk_exit(void)
593 {
594         ps3_system_bus_driver_unregister(&ps3disk);
595         unregister_blkdev(ps3disk_major, DEVICE_NAME);
596 }
597
598 module_init(ps3disk_init);
599 module_exit(ps3disk_exit);
600
601 MODULE_LICENSE("GPL");
602 MODULE_DESCRIPTION("PS3 Disk Storage Driver");
603 MODULE_AUTHOR("Sony Corporation");
604 MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_DISK);