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
|
/*
* Support for emulating SAT (ata pass through) on devices based
* on the Cypress USB/ATA bridge supporting ATACB.
*
* Copyright (c) 2008 Matthieu Castet (castet.matthieu@free.fr)
*
* 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.
*/
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_eh.h>
#include <linux/ata.h>
#include "usb.h"
#include "protocol.h"
#include "scsiglue.h"
#include "debug.h"
/*
* ATACB is a protocol used on cypress usb<->ata bridge to
* send raw ATA command over mass storage
* There is a ATACB2 protocol that support LBA48 on newer chip.
* More info that be found on cy7c68310_8.pdf and cy7c68300c_8.pdf
* datasheet from cypress.com.
*/
void cypress_atacb_passthrough(struct scsi_cmnd *srb, struct us_data *us)
{
unsigned char save_cmnd[MAX_COMMAND_SIZE];
if (likely(srb->cmnd[0] != ATA_16 && srb->cmnd[0] != ATA_12)) {
usb_stor_transparent_scsi_command(srb, us);
return;
}
memcpy(save_cmnd, srb->cmnd, sizeof(save_cmnd));
memset(srb->cmnd, 0, MAX_COMMAND_SIZE);
/* check if we support the command */
if (save_cmnd[1] >> 5) /* MULTIPLE_COUNT */
goto invalid_fld;
/* check protocol */
switch((save_cmnd[1] >> 1) & 0xf) {
case 3: /*no DATA */
case 4: /* PIO in */
case 5: /* PIO out */
break;
default:
goto invalid_fld;
}
/* first build the ATACB command */
srb->cmd_len = 16;
srb->cmnd[0] = 0x24; /* bVSCBSignature : vendor-specific command
this value can change, but most(all ?) manufacturers
keep the cypress default : 0x24 */
srb->cmnd[1] = 0x24; /* bVSCBSubCommand : 0x24 for ATACB */
srb->cmnd[3] = 0xff - 1; /* features, sector count, lba low, lba med
lba high, device, command are valid */
srb->cmnd[4] = 1; /* TransferBlockCount : 512 */
if (save_cmnd[0] == ATA_16) {
srb->cmnd[ 6] = save_cmnd[ 4]; /* features */
srb->cmnd[ 7] = save_cmnd[ 6]; /* sector count */
srb->cmnd[ 8] = save_cmnd[ 8]; /* lba low */
srb->cmnd[ 9] = save_cmnd[10]; /* lba med */
srb->cmnd[10] = save_cmnd[12]; /* lba high */
srb->cmnd[11] = save_cmnd[13]; /* device */
srb->cmnd[12] = save_cmnd[14]; /* command */
if (save_cmnd[1] & 0x01) {/* extended bit set for LBA48 */
/* this could be supported by atacb2 */
if (save_cmnd[3] || save_cmnd[5] || save_cmnd[7] || save_cmnd[9]
|| save_cmnd[11])
goto invalid_fld;
}
}
else { /* ATA12 */
srb->cmnd[ 6] = save_cmnd[3]; /* features */
srb->cmnd[ 7] = save_cmnd[4]; /* sector count */
srb->cmnd[ 8] = save_cmnd[5]; /* lba low */
srb->cmnd[ 9] = save_cmnd[6]; /* lba med */
srb->cmnd[10] = save_cmnd[7]; /* lba high */
srb->cmnd[11] = save_cmnd[8]; /* device */
srb->cmnd[12] = save_cmnd[9]; /* command */
}
/* Filter SET_FEATURES - XFER MODE command */
if ((srb->cmnd[12] == ATA_CMD_SET_FEATURES)
&& (srb->cmnd[6] == SETFEATURES_XFER))
goto invalid_fld;
if (srb->cmnd[12] == ATA_CMD_ID_ATA || srb->cmnd[12] == ATA_CMD_ID_ATAPI)
srb->cmnd[2] |= (1<<7); /* set IdentifyPacketDevice for these cmds */
usb_stor_transparent_scsi_command(srb, us);
/* if the device doesn't support ATACB
*/
if (srb->result == SAM_STAT_CHECK_CONDITION &&
memcmp(srb->sense_buffer, usb_stor_sense_invalidCDB,
sizeof(usb_stor_sense_invalidCDB)) == 0) {
US_DEBUGP("cypress atacb not supported ???\n");
goto end;
}
/* if ck_cond flags is set, and there wasn't critical error,
* build the special sense
*/
if ((srb->result != (DID_ERROR << 16) &&
srb->result != (DID_ABORT << 16)) &&
save_cmnd[2] & 0x20) {
struct scsi_eh_save ses;
unsigned char regs[8];
unsigned char *sb = srb->sense_buffer;
unsigned char *desc = sb + 8;
int tmp_result;
/* build the command for
* reading the ATA registers */
scsi_eh_prep_cmnd(srb, &ses, NULL, 0, 0);
srb->sdb.length = sizeof(regs);
sg_init_one(&ses.sense_sgl, regs, srb->sdb.length);
srb->sdb.table.sgl = &ses.sense_sgl;
srb->sc_data_direction = DMA_FROM_DEVICE;
srb->sdb.table.nents = 1;
/* we use the same command as before, but we set
* the read taskfile bit, for not executing atacb command,
* but reading register selected in srb->cmnd[4]
*/
srb->cmnd[2] = 1;
usb_stor_transparent_scsi_command(srb, us);
tmp_result = srb->result;
scsi_eh_restore_cmnd(srb, &ses);
/* we fail to get registers, report invalid command */
if (tmp_result != SAM_STAT_GOOD)
goto invalid_fld;
/* build the sense */
memset(sb, 0, SCSI_SENSE_BUFFERSIZE);
/* set sk, asc for a good command */
sb[1] = RECOVERED_ERROR;
sb[2] = 0; /* ATA PASS THROUGH INFORMATION AVAILABLE */
sb[3] = 0x1D;
/* XXX we should generate sk, asc, ascq from status and error
* regs
* (see 11.1 Error translation � ATA device error to SCSI error map)
* and ata_to_sense_error from libata.
*/
/* Sense data is current and format is descriptor. */
sb[0] = 0x72;
desc[0] = 0x09; /* ATA_RETURN_DESCRIPTOR */
/* set length of additional sense data */
sb[7] = 14;
desc[1] = 12;
/* Copy registers into sense buffer. */
desc[ 2] = 0x00;
desc[ 3] = regs[1]; /* features */
desc[ 5] = regs[2]; /* sector count */
desc[ 7] = regs[3]; /* lba low */
desc[ 9] = regs[4]; /* lba med */
desc[11] = regs[5]; /* lba high */
desc[12] = regs[6]; /* device */
desc[13] = regs[7]; /* command */
srb->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
}
goto end;
invalid_fld:
srb->result = (DRIVER_SENSE << 24) | SAM_STAT_CHECK_CONDITION;
memcpy(srb->sense_buffer,
usb_stor_sense_invalidCDB,
sizeof(usb_stor_sense_invalidCDB));
end:
memcpy(srb->cmnd, save_cmnd, sizeof(save_cmnd));
if (srb->cmnd[0] == ATA_12)
srb->cmd_len = 12;
}
|
