summaryrefslogtreecommitdiffstats
path: root/drivers/scsi/ps3rom.c
blob: 0f43d1d046d950af370e5fc902fdbee37d4edd4a (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
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
/*
 * PS3 BD/DVD/CD-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/cdrom.h>
#include <linux/highmem.h>

#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_dbg.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>

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


#define DEVICE_NAME			"ps3rom"

#define BOUNCE_SIZE			(64*1024)

#define PS3ROM_MAX_SECTORS		(BOUNCE_SIZE / CD_FRAMESIZE)


struct ps3rom_private {
	struct ps3_storage_device *dev;
	struct scsi_cmnd *curr_cmd;
};


#define LV1_STORAGE_SEND_ATAPI_COMMAND	(1)

struct lv1_atapi_cmnd_block {
	u8	pkt[32];	/* packet command block           */
	u32	pktlen;		/* should be 12 for ATAPI 8020    */
	u32	blocks;
	u32	block_size;
	u32	proto;		/* transfer mode                  */
	u32	in_out;		/* transfer direction             */
	u64	buffer;		/* parameter except command block */
	u32	arglen;		/* length above                   */
};

enum lv1_atapi_proto {
	NON_DATA_PROTO     = 0,
	PIO_DATA_IN_PROTO  = 1,
	PIO_DATA_OUT_PROTO = 2,
	DMA_PROTO = 3
};

enum lv1_atapi_in_out {
	DIR_WRITE = 0,		/* memory -> device */
	DIR_READ = 1		/* device -> memory */
};


static int ps3rom_slave_configure(struct scsi_device *scsi_dev)
{
	struct ps3rom_private *priv = shost_priv(scsi_dev->host);
	struct ps3_storage_device *dev = priv->dev;

	dev_dbg(&dev->sbd.core, "%s:%u: id %u, lun %u, channel %u\n", __func__,
		__LINE__, scsi_dev->id, scsi_dev->lun, scsi_dev->channel);

	/*
	 * ATAPI SFF8020 devices use MODE_SENSE_10,
	 * so we can prohibit MODE_SENSE_6
	 */
	scsi_dev->use_10_for_ms = 1;

	/* we don't support {READ,WRITE}_6 */
	scsi_dev->use_10_for_rw = 1;

	return 0;
}

/*
 * copy data from device into scatter/gather buffer
 */
static int fill_from_dev_buffer(struct scsi_cmnd *cmd, const void *buf)
{
	int k, req_len, act_len, len, active;
	void *kaddr;
	struct scatterlist *sgpnt;
	unsigned int buflen;

	buflen = scsi_bufflen(cmd);
	if (!buflen)
		return 0;

	if (!scsi_sglist(cmd))
		return -1;

	active = 1;
	req_len = act_len = 0;
	scsi_for_each_sg(cmd, sgpnt, scsi_sg_count(cmd), k) {
		if (active) {
			kaddr = kmap_atomic(sgpnt->page, KM_IRQ0);
			len = sgpnt->length;
			if ((req_len + len) > buflen) {
				active = 0;
				len = buflen - req_len;
			}
			memcpy(kaddr + sgpnt->offset, buf + req_len, len);
			flush_kernel_dcache_page(sgpnt->page);
			kunmap_atomic(kaddr, KM_IRQ0);
			act_len += len;
		}
		req_len += sgpnt->length;
	}
	scsi_set_resid(cmd, req_len - act_len);
	return 0;
}

/*
 * copy data from scatter/gather into device's buffer
 */
static int fetch_to_dev_buffer(struct scsi_cmnd *cmd, void *buf)
{
	int k, req_len, len, fin;
	void *kaddr;
	struct scatterlist *sgpnt;
	unsigned int buflen;

	buflen = scsi_bufflen(cmd);
	if (!buflen)
		return 0;

	if (!scsi_sglist(cmd))
		return -1;

	req_len = fin = 0;
	scsi_for_each_sg(cmd, sgpnt, scsi_sg_count(cmd), k) {
		kaddr = kmap_atomic(sgpnt->page, KM_IRQ0);
		len = sgpnt->length;
		if ((req_len + len) > buflen) {
			len = buflen - req_len;
			fin = 1;
		}
		memcpy(buf + req_len, kaddr + sgpnt->offset, len);
		kunmap_atomic(kaddr, KM_IRQ0);
		if (fin)
			return req_len + len;
		req_len += sgpnt->length;
	}
	return req_len;
}

static int ps3rom_atapi_request(struct ps3_storage_device *dev,
				struct scsi_cmnd *cmd)
{
	struct lv1_atapi_cmnd_block atapi_cmnd;
	unsigned char opcode = cmd->cmnd[0];
	int res;
	u64 lpar;

	dev_dbg(&dev->sbd.core, "%s:%u: send ATAPI command 0x%02x\n", __func__,
		__LINE__, opcode);

	memset(&atapi_cmnd, 0, sizeof(struct lv1_atapi_cmnd_block));
	memcpy(&atapi_cmnd.pkt, cmd->cmnd, 12);
	atapi_cmnd.pktlen = 12;
	atapi_cmnd.block_size = 1; /* transfer size is block_size * blocks */
	atapi_cmnd.blocks = atapi_cmnd.arglen = scsi_bufflen(cmd);
	atapi_cmnd.buffer = dev->bounce_lpar;

	switch (cmd->sc_data_direction) {
	case DMA_FROM_DEVICE:
		if (scsi_bufflen(cmd) >= CD_FRAMESIZE)
			atapi_cmnd.proto = DMA_PROTO;
		else
			atapi_cmnd.proto = PIO_DATA_IN_PROTO;
		atapi_cmnd.in_out = DIR_READ;
		break;

	case DMA_TO_DEVICE:
		if (scsi_bufflen(cmd) >= CD_FRAMESIZE)
			atapi_cmnd.proto = DMA_PROTO;
		else
			atapi_cmnd.proto = PIO_DATA_OUT_PROTO;
		atapi_cmnd.in_out = DIR_WRITE;
		res = fetch_to_dev_buffer(cmd, dev->bounce_buf);
		if (res < 0)
			return DID_ERROR << 16;
		break;

	default:
		atapi_cmnd.proto = NON_DATA_PROTO;
		break;
	}

	lpar = ps3_mm_phys_to_lpar(__pa(&atapi_cmnd));
	res = lv1_storage_send_device_command(dev->sbd.dev_id,
					      LV1_STORAGE_SEND_ATAPI_COMMAND,
					      lpar, sizeof(atapi_cmnd),
					      atapi_cmnd.buffer,
					      atapi_cmnd.arglen, &dev->tag);
	if (res == LV1_DENIED_BY_POLICY) {
		dev_dbg(&dev->sbd.core,
			"%s:%u: ATAPI command 0x%02x denied by policy\n",
			__func__, __LINE__, opcode);
		return DID_ERROR << 16;
	}

	if (res) {
		dev_err(&dev->sbd.core,
			"%s:%u: ATAPI command 0x%02x failed %d\n", __func__,
			__LINE__, opcode, res);
		return DID_ERROR << 16;
	}

	return 0;
}

static inline unsigned int srb10_lba(const struct scsi_cmnd *cmd)
{
	return cmd->cmnd[2] << 24 | cmd->cmnd[3] << 16 | cmd->cmnd[4] << 8 |
	       cmd->cmnd[5];
}

static inline unsigned int srb10_len(const struct scsi_cmnd *cmd)
{
	return cmd->cmnd[7] << 8 | cmd->cmnd[8];
}

static int ps3rom_read_request(struct ps3_storage_device *dev,
			       struct scsi_cmnd *cmd, u32 start_sector,
			       u32 sectors)
{
	int res;

	dev_dbg(&dev->sbd.core, "%s:%u: read %u sectors starting at %u\n",
		__func__, __LINE__, sectors, start_sector);

	res = lv1_storage_read(dev->sbd.dev_id,
			       dev->regions[dev->region_idx].id, start_sector,
			       sectors, 0, dev->bounce_lpar, &dev->tag);
	if (res) {
		dev_err(&dev->sbd.core, "%s:%u: read failed %d\n", __func__,
			__LINE__, res);
		return DID_ERROR << 16;
	}

	return 0;
}

static int ps3rom_write_request(struct ps3_storage_device *dev,
				struct scsi_cmnd *cmd, u32 start_sector,
				u32 sectors)
{
	int res;

	dev_dbg(&dev->sbd.core, "%s:%u: write %u sectors starting at %u\n",
		__func__, __LINE__, sectors, start_sector);

	res = fetch_to_dev_buffer(cmd, dev->bounce_buf);
	if (res < 0)
		return DID_ERROR << 16;

	res = lv1_storage_write(dev->sbd.dev_id,
				dev->regions[dev->region_idx].id, start_sector,
				sectors, 0, dev->bounce_lpar, &dev->tag);
	if (res) {
		dev_err(&dev->sbd.core, "%s:%u: write failed %d\n", __func__,
			__LINE__, res);
		return DID_ERROR << 16;
	}

	return 0;
}

static int ps3rom_queuecommand(struct scsi_cmnd *cmd,
			       void (*done)(struct scsi_cmnd *))
{
	struct ps3rom_private *priv = shost_priv(cmd->device->host);
	struct ps3_storage_device *dev = priv->dev;
	unsigned char opcode;
	int res;

#ifdef DEBUG
	scsi_print_command(cmd);
#endif

	priv->curr_cmd = cmd;
	cmd->scsi_done = done;

	opcode = cmd->cmnd[0];
	/*
	 * While we can submit READ/WRITE SCSI commands as ATAPI commands,
	 * it's recommended for various reasons (performance, error handling,
	 * ...) to use lv1_storage_{read,write}() instead
	 */
	switch (opcode) {
	case READ_10:
		res = ps3rom_read_request(dev, cmd, srb10_lba(cmd),
					  srb10_len(cmd));
		break;

	case WRITE_10:
		res = ps3rom_write_request(dev, cmd, srb10_lba(cmd),
					   srb10_len(cmd));
		break;

	default:
		res = ps3rom_atapi_request(dev, cmd);
		break;
	}

	if (res) {
		memset(cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
		cmd->result = res;
		cmd->sense_buffer[0] = 0x70;
		cmd->sense_buffer[2] = ILLEGAL_REQUEST;
		priv->curr_cmd = NULL;
		cmd->scsi_done(cmd);
	}

	return 0;
}

static int decode_lv1_status(u64 status, unsigned char *sense_key,
			     unsigned char *asc, unsigned char *ascq)
{
	if (((status >> 24) & 0xff) != SAM_STAT_CHECK_CONDITION)
		return -1;

	*sense_key = (status >> 16) & 0xff;
	*asc       = (status >>  8) & 0xff;
	*ascq      =  status        & 0xff;
	return 0;
}

static irqreturn_t ps3rom_interrupt(int irq, void *data)
{
	struct ps3_storage_device *dev = data;
	struct Scsi_Host *host;
	struct ps3rom_private *priv;
	struct scsi_cmnd *cmd;
	int res;
	u64 tag, status;
	unsigned char sense_key, asc, ascq;

	res = lv1_storage_get_async_status(dev->sbd.dev_id, &tag, &status);
	/*
	 * status = -1 may mean that ATAPI transport completed OK, but
	 * ATAPI command itself resulted CHECK CONDITION
	 * so, upper layer should issue REQUEST_SENSE to check the sense data
	 */

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

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

	host = dev->sbd.core.driver_data;
	priv = shost_priv(host);
	cmd = priv->curr_cmd;

	if (!status) {
		/* OK, completed */
		if (cmd->sc_data_direction == DMA_FROM_DEVICE) {
			res = fill_from_dev_buffer(cmd, dev->bounce_buf);
			if (res) {
				cmd->result = DID_ERROR << 16;
				goto done;
			}
		}
		cmd->result = DID_OK << 16;
		goto done;
	}

	if (cmd->cmnd[0] == REQUEST_SENSE) {
		/* SCSI spec says request sense should never get error */
		dev_err(&dev->sbd.core, "%s:%u: end error without autosense\n",
			__func__, __LINE__);
		cmd->result = DID_ERROR << 16 | SAM_STAT_CHECK_CONDITION;
		goto done;
	}

	if (decode_lv1_status(status, &sense_key, &asc, &ascq)) {
		cmd->result = DID_ERROR << 16;
		goto done;
	}

	cmd->sense_buffer[0]  = 0x70;
	cmd->sense_buffer[2]  = sense_key;
	cmd->sense_buffer[7]  = 16 - 6;
	cmd->sense_buffer[12] = asc;
	cmd->sense_buffer[13] = ascq;
	cmd->result = SAM_STAT_CHECK_CONDITION;

done:
	priv->curr_cmd = NULL;
	cmd->scsi_done(cmd);
	return IRQ_HANDLED;
}

static struct scsi_host_template ps3rom_host_template = {
	.name =			DEVICE_NAME,
	.slave_configure =	ps3rom_slave_configure,
	.queuecommand =		ps3rom_queuecommand,
	.can_queue =		1,
	.this_id =		7,
	.sg_tablesize =		SG_ALL,
	.cmd_per_lun =		1,
	.emulated =             1,		/* only sg driver uses this */
	.max_sectors =		PS3ROM_MAX_SECTORS,
	.use_clustering =	ENABLE_CLUSTERING,
	.module =		THIS_MODULE,
};


static int __devinit ps3rom_probe(struct ps3_system_bus_device *_dev)
{
	struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
	int error;
	struct Scsi_Host *host;
	struct ps3rom_private *priv;

	if (dev->blk_size != CD_FRAMESIZE) {
		dev_err(&dev->sbd.core,
			"%s:%u: cannot handle block size %lu\n", __func__,
			__LINE__, dev->blk_size);
		return -EINVAL;
	}

	dev->bounce_size = BOUNCE_SIZE;
	dev->bounce_buf = kmalloc(BOUNCE_SIZE, GFP_DMA);
	if (!dev->bounce_buf)
		return -ENOMEM;

	error = ps3stor_setup(dev, ps3rom_interrupt);
	if (error)
		goto fail_free_bounce;

	host = scsi_host_alloc(&ps3rom_host_template,
			       sizeof(struct ps3rom_private));
	if (!host) {
		dev_err(&dev->sbd.core, "%s:%u: scsi_host_alloc failed\n",
			__func__, __LINE__);
		goto fail_teardown;
	}

	priv = shost_priv(host);
	dev->sbd.core.driver_data = host;
	priv->dev = dev;

	/* One device/LUN per SCSI bus */
	host->max_id = 1;
	host->max_lun = 1;

	error = scsi_add_host(host, &dev->sbd.core);
	if (error) {
		dev_err(&dev->sbd.core, "%s:%u: scsi_host_alloc failed %d\n",
			__func__, __LINE__, error);
		error = -ENODEV;
		goto fail_host_put;
	}

	scsi_scan_host(host);
	return 0;

fail_host_put:
	scsi_host_put(host);
	dev->sbd.core.driver_data = NULL;
fail_teardown:
	ps3stor_teardown(dev);
fail_free_bounce:
	kfree(dev->bounce_buf);
	return error;
}

static int ps3rom_remove(struct ps3_system_bus_device *_dev)
{
	struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
	struct Scsi_Host *host = dev->sbd.core.driver_data;

	scsi_remove_host(host);
	ps3stor_teardown(dev);
	scsi_host_put(host);
	dev->sbd.core.driver_data = NULL;
	kfree(dev->bounce_buf);
	return 0;
}

static struct ps3_system_bus_driver ps3rom = {
	.match_id	= PS3_MATCH_ID_STOR_ROM,
	.core.name	= DEVICE_NAME,
	.core.owner	= THIS_MODULE,
	.probe		= ps3rom_probe,
	.remove		= ps3rom_remove
};


static int __init ps3rom_init(void)
{
	return ps3_system_bus_driver_register(&ps3rom);
}

static void __exit ps3rom_exit(void)
{
	ps3_system_bus_driver_unregister(&ps3rom);
}

module_init(ps3rom_init);
module_exit(ps3rom_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("PS3 BD/DVD/CD-ROM Storage Driver");
MODULE_AUTHOR("Sony Corporation");
MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_ROM);
OpenPOWER on IntegriCloud