aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/usb/storage/freecom.c
blob: 73ac7262239e510ad9af1ec62883b4d588ca0332 (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
/* Driver for Freecom USB/IDE adaptor
 *
 * Freecom v0.1:
 *
 * First release
 *
 * Current development and maintenance by:
 *   (C) 2000 David Brown <usb-storage@davidb.org>
 *
 * 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; either version 2, or (at your option) any
 * later version.
 *
 * 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.,
 * 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * This driver was developed with information provided in FREECOM's USB
 * Programmers Reference Guide.  For further information contact Freecom
 * (http://www.freecom.de/)
 */

#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>

#include "usb.h"
#include "transport.h"
#include "protocol.h"
#include "debug.h"
#include "freecom.h"

#ifdef CONFIG_USB_STORAGE_DEBUG
static void pdump (void *, int);
#endif

/* Bits of HD_STATUS */
#define ERR_STAT		0x01
#define DRQ_STAT		0x08

/* All of the outgoing packets are 64 bytes long. */
struct freecom_cb_wrap {
	u8    Type;		/* Command type. */
	u8    Timeout;		/* Timeout in seconds. */
	u8    Atapi[12];	/* An ATAPI packet. */
	u8    Filler[50];	/* Padding Data. */
};

struct freecom_xfer_wrap {
	u8    Type;		/* Command type. */
	u8    Timeout;		/* Timeout in seconds. */
	__le32   Count;		/* Number of bytes to transfer. */
	u8    Pad[58];
} __attribute__ ((packed));

struct freecom_ide_out {
	u8    Type;		/* Type + IDE register. */
	u8    Pad;
	__le16   Value;		/* Value to write. */
	u8    Pad2[60];
};

struct freecom_ide_in {
	u8    Type;		/* Type | IDE register. */
	u8    Pad[63];
};

struct freecom_status {
	u8    Status;
	u8    Reason;
	__le16   Count;
	u8    Pad[60];
};

/* Freecom stuffs the interrupt status in the INDEX_STAT bit of the ide
 * register. */
#define FCM_INT_STATUS		0x02 /* INDEX_STAT */
#define FCM_STATUS_BUSY		0x80

/* These are the packet types.  The low bit indicates that this command
 * should wait for an interrupt. */
#define FCM_PACKET_ATAPI	0x21
#define FCM_PACKET_STATUS	0x20

/* Receive data from the IDE interface.  The ATAPI packet has already
 * waited, so the data should be immediately available. */
#define FCM_PACKET_INPUT	0x81

/* Send data to the IDE interface. */
#define FCM_PACKET_OUTPUT	0x01

/* Write a value to an ide register.  Or the ide register to write after
 * munging the address a bit. */
#define FCM_PACKET_IDE_WRITE	0x40
#define FCM_PACKET_IDE_READ	0xC0

/* All packets (except for status) are 64 bytes long. */
#define FCM_PACKET_LENGTH		64
#define FCM_STATUS_PACKET_LENGTH	4

static int
freecom_readdata (struct scsi_cmnd *srb, struct us_data *us,
		unsigned int ipipe, unsigned int opipe, int count)
{
	struct freecom_xfer_wrap *fxfr =
		(struct freecom_xfer_wrap *) us->iobuf;
	int result;

	fxfr->Type = FCM_PACKET_INPUT | 0x00;
	fxfr->Timeout = 0;    /* Short timeout for debugging. */
	fxfr->Count = cpu_to_le32 (count);
	memset (fxfr->Pad, 0, sizeof (fxfr->Pad));

	US_DEBUGP("Read data Freecom! (c=%d)\n", count);

	/* Issue the transfer command. */
	result = usb_stor_bulk_transfer_buf (us, opipe, fxfr,
			FCM_PACKET_LENGTH, NULL);
	if (result != USB_STOR_XFER_GOOD) {
		US_DEBUGP ("Freecom readdata transport error\n");
		return USB_STOR_TRANSPORT_ERROR;
	}

	/* Now transfer all of our blocks. */
	US_DEBUGP("Start of read\n");
	result = usb_stor_bulk_srb(us, ipipe, srb);
	US_DEBUGP("freecom_readdata done!\n");

	if (result > USB_STOR_XFER_SHORT)
		return USB_STOR_TRANSPORT_ERROR;
	return USB_STOR_TRANSPORT_GOOD;
}

static int
freecom_writedata (struct scsi_cmnd *srb, struct us_data *us,
		int unsigned ipipe, unsigned int opipe, int count)
{
	struct freecom_xfer_wrap *fxfr =
		(struct freecom_xfer_wrap *) us->iobuf;
	int result;

	fxfr->Type = FCM_PACKET_OUTPUT | 0x00;
	fxfr->Timeout = 0;    /* Short timeout for debugging. */
	fxfr->Count = cpu_to_le32 (count);
	memset (fxfr->Pad, 0, sizeof (fxfr->Pad));

	US_DEBUGP("Write data Freecom! (c=%d)\n", count);

	/* Issue the transfer command. */
	result = usb_stor_bulk_transfer_buf (us, opipe, fxfr,
			FCM_PACKET_LENGTH, NULL);
	if (result != USB_STOR_XFER_GOOD) {
		US_DEBUGP ("Freecom writedata transport error\n");
		return USB_STOR_TRANSPORT_ERROR;
	}

	/* Now transfer all of our blocks. */
	US_DEBUGP("Start of write\n");
	result = usb_stor_bulk_srb(us, opipe, srb);

	US_DEBUGP("freecom_writedata done!\n");
	if (result > USB_STOR_XFER_SHORT)
		return USB_STOR_TRANSPORT_ERROR;
	return USB_STOR_TRANSPORT_GOOD;
}

/*
 * Transport for the Freecom USB/IDE adaptor.
 *
 */
int freecom_transport(struct scsi_cmnd *srb, struct us_data *us)
{
	struct freecom_cb_wrap *fcb;
	struct freecom_status  *fst;
	unsigned int ipipe, opipe;		/* We need both pipes. */
	int result;
	unsigned int partial;
	int length;

	fcb = (struct freecom_cb_wrap *) us->iobuf;
	fst = (struct freecom_status *) us->iobuf;

	US_DEBUGP("Freecom TRANSPORT STARTED\n");

	/* Get handles for both transports. */
	opipe = us->send_bulk_pipe;
	ipipe = us->recv_bulk_pipe;

	/* The ATAPI Command always goes out first. */
	fcb->Type = FCM_PACKET_ATAPI | 0x00;
	fcb->Timeout = 0;
	memcpy (fcb->Atapi, srb->cmnd, 12);
	memset (fcb->Filler, 0, sizeof (fcb->Filler));

	US_DEBUG(pdump (srb->cmnd, 12));

	/* Send it out. */
	result = usb_stor_bulk_transfer_buf (us, opipe, fcb,
			FCM_PACKET_LENGTH, NULL);

	/* The Freecom device will only fail if there is something wrong in
	 * USB land.  It returns the status in its own registers, which
	 * come back in the bulk pipe. */
	if (result != USB_STOR_XFER_GOOD) {
		US_DEBUGP ("freecom transport error\n");
		return USB_STOR_TRANSPORT_ERROR;
	}

	/* There are times we can optimize out this status read, but it
	 * doesn't hurt us to always do it now. */
	result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
			FCM_STATUS_PACKET_LENGTH, &partial);
	US_DEBUGP("foo Status result %d %u\n", result, partial);
	if (result != USB_STOR_XFER_GOOD)
		return USB_STOR_TRANSPORT_ERROR;

	US_DEBUG(pdump ((void *) fst, partial));

	/* The firmware will time-out commands after 20 seconds. Some commands
	 * can legitimately take longer than this, so we use a different
	 * command that only waits for the interrupt and then sends status,
	 * without having to send a new ATAPI command to the device. 
	 *
	 * NOTE: There is some indication that a data transfer after a timeout
	 * may not work, but that is a condition that should never happen.
	 */
	while (fst->Status & FCM_STATUS_BUSY) {
		US_DEBUGP("20 second USB/ATAPI bridge TIMEOUT occurred!\n");
		US_DEBUGP("fst->Status is %x\n", fst->Status);

		/* Get the status again */
		fcb->Type = FCM_PACKET_STATUS;
		fcb->Timeout = 0;
		memset (fcb->Atapi, 0, sizeof(fcb->Atapi));
		memset (fcb->Filler, 0, sizeof (fcb->Filler));

		/* Send it out. */
		result = usb_stor_bulk_transfer_buf (us, opipe, fcb,
				FCM_PACKET_LENGTH, NULL);

		/* The Freecom device will only fail if there is something
		 * wrong in USB land.  It returns the status in its own
		 * registers, which come back in the bulk pipe.
		 */
		if (result != USB_STOR_XFER_GOOD) {
			US_DEBUGP ("freecom transport error\n");
			return USB_STOR_TRANSPORT_ERROR;
		}

		/* get the data */
		result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
				FCM_STATUS_PACKET_LENGTH, &partial);

		US_DEBUGP("bar Status result %d %u\n", result, partial);
		if (result != USB_STOR_XFER_GOOD)
			return USB_STOR_TRANSPORT_ERROR;

		US_DEBUG(pdump ((void *) fst, partial));
	}

	if (partial != 4)
		return USB_STOR_TRANSPORT_ERROR;
	if ((fst->Status & 1) != 0) {
		US_DEBUGP("operation failed\n");
		return USB_STOR_TRANSPORT_FAILED;
	}

	/* The device might not have as much data available as we
	 * requested.  If you ask for more than the device has, this reads
	 * and such will hang. */
	US_DEBUGP("Device indicates that it has %d bytes available\n",
			le16_to_cpu (fst->Count));
	US_DEBUGP("SCSI requested %d\n", scsi_bufflen(srb));

	/* Find the length we desire to read. */
	switch (srb->cmnd[0]) {
		case INQUIRY:
		case REQUEST_SENSE:		/* 16 or 18 bytes? spec says 18, lots of devices only have 16 */
		case MODE_SENSE:
		case MODE_SENSE_10:
			length = le16_to_cpu(fst->Count);
			break;
		default:
			length = scsi_bufflen(srb);
	}

	/* verify that this amount is legal */
	if (length > scsi_bufflen(srb)) {
		length = scsi_bufflen(srb);
		US_DEBUGP("Truncating request to match buffer length: %d\n", length);
	}

	/* What we do now depends on what direction the data is supposed to
	 * move in. */

	switch (us->srb->sc_data_direction) {
	case DMA_FROM_DEVICE:
		/* catch bogus "read 0 length" case */
		if (!length)
			break;
		/* Make sure that the status indicates that the device
		 * wants data as well. */
		if ((fst->Status & DRQ_STAT) == 0 || (fst->Reason & 3) != 2) {
			US_DEBUGP("SCSI wants data, drive doesn't have any\n");
			return USB_STOR_TRANSPORT_FAILED;
		}
		result = freecom_readdata (srb, us, ipipe, opipe, length);
		if (result != USB_STOR_TRANSPORT_GOOD)
			return result;

		US_DEBUGP("FCM: Waiting for status\n");
		result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
				FCM_PACKET_LENGTH, &partial);
		US_DEBUG(pdump ((void *) fst, partial));

		if (partial != 4 || result > USB_STOR_XFER_SHORT)
			return USB_STOR_TRANSPORT_ERROR;
		if ((fst->Status & ERR_STAT) != 0) {
			US_DEBUGP("operation failed\n");
			return USB_STOR_TRANSPORT_FAILED;
		}
		if ((fst->Reason & 3) != 3) {
			US_DEBUGP("Drive seems still hungry\n");
			return USB_STOR_TRANSPORT_FAILED;
		}
		US_DEBUGP("Transfer happy\n");
		break;

	case DMA_TO_DEVICE:
		/* catch bogus "write 0 length" case */
		if (!length)
			break;
		/* Make sure the status indicates that the device wants to
		 * send us data. */
		/* !!IMPLEMENT!! */
		result = freecom_writedata (srb, us, ipipe, opipe, length);
		if (result != USB_STOR_TRANSPORT_GOOD)
			return result;

		US_DEBUGP("FCM: Waiting for status\n");
		result = usb_stor_bulk_transfer_buf (us, ipipe, fst,
				FCM_PACKET_LENGTH, &partial);

		if (partial != 4 || result > USB_STOR_XFER_SHORT)
			return USB_STOR_TRANSPORT_ERROR;
		if ((fst->Status & ERR_STAT) != 0) {
			US_DEBUGP("operation failed\n");
			return USB_STOR_TRANSPORT_FAILED;
		}
		if ((fst->Reason & 3) != 3) {
			US_DEBUGP("Drive seems still hungry\n");
			return USB_STOR_TRANSPORT_FAILED;
		}

		US_DEBUGP("Transfer happy\n");
		break;


	case DMA_NONE:
		/* Easy, do nothing. */
		break;

	default:
		/* should never hit here -- filtered in usb.c */
		US_DEBUGP ("freecom unimplemented direction: %d\n",
				us->srb->sc_data_direction);
		// Return fail, SCSI seems to handle this better.
		return USB_STOR_TRANSPORT_FAILED;
		break;
	}

	return USB_STOR_TRANSPORT_GOOD;
}

int
freecom_init (struct us_data *us)
{
	int result;
	char *buffer = us->iobuf;

	/* The DMA-mapped I/O buffer is 64 bytes long, just right for
	 * all our packets.  No need to allocate any extra buffer space.
	 */

	result = usb_stor_control_msg(us, us->recv_ctrl_pipe,
			0x4c, 0xc0, 0x4346, 0x0, buffer, 0x20, 3*HZ);
	buffer[32] = '\0';
	US_DEBUGP("String returned from FC init is: %s\n", buffer);

	/* Special thanks to the people at Freecom for providing me with
	 * this "magic sequence", which they use in their Windows and MacOS
	 * drivers to make sure that all the attached perhiperals are
	 * properly reset.
	 */

	/* send reset */
	result = usb_stor_control_msg(us, us->send_ctrl_pipe,
			0x4d, 0x40, 0x24d8, 0x0, NULL, 0x0, 3*HZ);
	US_DEBUGP("result from activate reset is %d\n", result);

	/* wait 250ms */
	mdelay(250);

	/* clear reset */
	result = usb_stor_control_msg(us, us->send_ctrl_pipe,
			0x4d, 0x40, 0x24f8, 0x0, NULL, 0x0, 3*HZ);
	US_DEBUGP("result from clear reset is %d\n", result);

	/* wait 3 seconds */
	mdelay(3 * 1000);

	return USB_STOR_TRANSPORT_GOOD;
}

int usb_stor_freecom_reset(struct us_data *us)
{
	printk (KERN_CRIT "freecom reset called\n");

	/* We don't really have this feature. */
	return FAILED;
}

#ifdef CONFIG_USB_STORAGE_DEBUG
static void pdump (void *ibuffer, int length)
{
	static char line[80];
	int offset = 0;
	unsigned char *buffer = (unsigned char *) ibuffer;
	int i, j;
	int from, base;

	offset = 0;
	for (i = 0; i < length; i++) {
		if ((i & 15) == 0) {
			if (i > 0) {
				offset += sprintf (line+offset, " - ");
				for (j = i - 16; j < i; j++) {
					if (buffer[j] >= 32 && buffer[j] <= 126)
						line[offset++] = buffer[j];
					else
						line[offset++] = '.';
				}
				line[offset] = 0;
				US_DEBUGP("%s\n", line);
				offset = 0;
			}
			offset += sprintf (line+offset, "%08x:", i);
		}
		else if ((i & 7) == 0) {
			offset += sprintf (line+offset, " -");
		}
		offset += sprintf (line+offset, " %02x", buffer[i] & 0xff);
	}

	/* Add the last "chunk" of data. */
	from = (length - 1) % 16;
	base = ((length - 1) / 16) * 16;

	for (i = from + 1; i < 16; i++)
		offset += sprintf (line+offset, "   ");
	if (from < 8)
		offset += sprintf (line+offset, "  ");
	offset += sprintf (line+offset, " - ");

	for (i = 0; i <= from; i++) {
		if (buffer[base+i] >= 32 && buffer[base+i] <= 126)
			line[offset++] = buffer[base+i];
		else
			line[offset++] = '.';
	}
	line[offset] = 0;
	US_DEBUGP("%s\n", line);
	offset = 0;
}
#endif

Privacy Policy