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1 | /* |
2 | * Support for emulating SAT (ata pass through) on devices based |
3 | * on the Cypress USB/ATA bridge supporting ATACB. |
4 | * |
5 | * Copyright (c) 2008 Matthieu Castet (castet.matthieu@free.fr) |
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 by the |
9 | * Free Software Foundation; either version 2, or (at your option) any |
10 | * later version. |
11 | * |
12 | * This program is distributed in the hope that it will be useful, but |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
15 | * General Public License for more details. |
16 | * |
17 | * You should have received a copy of the GNU General Public License along |
18 | * with this program; if not, write to the Free Software Foundation, Inc., |
19 | * 675 Mass Ave, Cambridge, MA 02139, USA. |
20 | */ |
21 | |
22 | #include <scsi/scsi.h> |
23 | #include <scsi/scsi_cmnd.h> |
24 | #include <scsi/scsi_eh.h> |
25 | #include <linux/ata.h> |
26 | |
27 | #include "usb.h" |
28 | #include "protocol.h" |
29 | #include "scsiglue.h" |
30 | #include "debug.h" |
31 | |
32 | /* |
33 | * ATACB is a protocol used on cypress usb<->ata bridge to |
34 | * send raw ATA command over mass storage |
35 | * There is a ATACB2 protocol that support LBA48 on newer chip. |
36 | * More info that be found on cy7c68310_8.pdf and cy7c68300c_8.pdf |
37 | * datasheet from cypress.com. |
38 | */ |
39 | void cypress_atacb_passthrough(struct scsi_cmnd *srb, struct us_data *us) |
40 | { |
41 | unsigned char save_cmnd[MAX_COMMAND_SIZE]; |
42 | |
43 | if (likely(srb->cmnd[0] != ATA_16 && srb->cmnd[0] != ATA_12)) { |
44 | usb_stor_transparent_scsi_command(srb, us); |
45 | return; |
46 | } |
47 | |
48 | memcpy(save_cmnd, srb->cmnd, sizeof(save_cmnd)); |
64a87b24 |
49 | memset(srb->cmnd, 0, MAX_COMMAND_SIZE); |
d277064e |
50 | |
51 | /* check if we support the command */ |
52 | if (save_cmnd[1] >> 5) /* MULTIPLE_COUNT */ |
53 | goto invalid_fld; |
54 | /* check protocol */ |
55 | switch((save_cmnd[1] >> 1) & 0xf) { |
56 | case 3: /*no DATA */ |
57 | case 4: /* PIO in */ |
58 | case 5: /* PIO out */ |
59 | break; |
60 | default: |
61 | goto invalid_fld; |
62 | } |
63 | |
64 | /* first build the ATACB command */ |
65 | srb->cmd_len = 16; |
66 | |
67 | srb->cmnd[0] = 0x24; /* bVSCBSignature : vendor-specific command |
68 | this value can change, but most(all ?) manufacturers |
69 | keep the cypress default : 0x24 */ |
70 | srb->cmnd[1] = 0x24; /* bVSCBSubCommand : 0x24 for ATACB */ |
71 | |
72 | srb->cmnd[3] = 0xff - 1; /* features, sector count, lba low, lba med |
73 | lba high, device, command are valid */ |
74 | srb->cmnd[4] = 1; /* TransferBlockCount : 512 */ |
75 | |
76 | if (save_cmnd[0] == ATA_16) { |
77 | srb->cmnd[ 6] = save_cmnd[ 4]; /* features */ |
78 | srb->cmnd[ 7] = save_cmnd[ 6]; /* sector count */ |
79 | srb->cmnd[ 8] = save_cmnd[ 8]; /* lba low */ |
80 | srb->cmnd[ 9] = save_cmnd[10]; /* lba med */ |
81 | srb->cmnd[10] = save_cmnd[12]; /* lba high */ |
82 | srb->cmnd[11] = save_cmnd[13]; /* device */ |
83 | srb->cmnd[12] = save_cmnd[14]; /* command */ |
84 | |
85 | if (save_cmnd[1] & 0x01) {/* extended bit set for LBA48 */ |
86 | /* this could be supported by atacb2 */ |
87 | if (save_cmnd[3] || save_cmnd[5] || save_cmnd[7] || save_cmnd[9] |
88 | || save_cmnd[11]) |
89 | goto invalid_fld; |
90 | } |
91 | } |
92 | else { /* ATA12 */ |
93 | srb->cmnd[ 6] = save_cmnd[3]; /* features */ |
94 | srb->cmnd[ 7] = save_cmnd[4]; /* sector count */ |
95 | srb->cmnd[ 8] = save_cmnd[5]; /* lba low */ |
96 | srb->cmnd[ 9] = save_cmnd[6]; /* lba med */ |
97 | srb->cmnd[10] = save_cmnd[7]; /* lba high */ |
98 | srb->cmnd[11] = save_cmnd[8]; /* device */ |
99 | srb->cmnd[12] = save_cmnd[9]; /* command */ |
100 | |
101 | } |
102 | /* Filter SET_FEATURES - XFER MODE command */ |
103 | if ((srb->cmnd[12] == ATA_CMD_SET_FEATURES) |
104 | && (srb->cmnd[6] == SETFEATURES_XFER)) |
105 | goto invalid_fld; |
106 | |
107 | if (srb->cmnd[12] == ATA_CMD_ID_ATA || srb->cmnd[12] == ATA_CMD_ID_ATAPI) |
108 | srb->cmnd[2] |= (1<<7); /* set IdentifyPacketDevice for these cmds */ |
109 | |
110 | |
111 | usb_stor_transparent_scsi_command(srb, us); |
112 | |
113 | /* if the device doesn't support ATACB |
114 | */ |
115 | if (srb->result == SAM_STAT_CHECK_CONDITION && |
116 | memcmp(srb->sense_buffer, usb_stor_sense_invalidCDB, |
117 | sizeof(usb_stor_sense_invalidCDB)) == 0) { |
118 | US_DEBUGP("cypress atacb not supported ???\n"); |
119 | goto end; |
120 | } |
121 | |
122 | /* if ck_cond flags is set, and there wasn't critical error, |
123 | * build the special sense |
124 | */ |
125 | if ((srb->result != (DID_ERROR << 16) && |
126 | srb->result != (DID_ABORT << 16)) && |
127 | save_cmnd[2] & 0x20) { |
128 | struct scsi_eh_save ses; |
129 | unsigned char regs[8]; |
130 | unsigned char *sb = srb->sense_buffer; |
131 | unsigned char *desc = sb + 8; |
132 | int tmp_result; |
133 | |
134 | /* build the command for |
135 | * reading the ATA registers */ |
136 | scsi_eh_prep_cmnd(srb, &ses, NULL, 0, 0); |
137 | srb->sdb.length = sizeof(regs); |
138 | sg_init_one(&ses.sense_sgl, regs, srb->sdb.length); |
139 | srb->sdb.table.sgl = &ses.sense_sgl; |
140 | srb->sc_data_direction = DMA_FROM_DEVICE; |
141 | srb->sdb.table.nents = 1; |
142 | /* we use the same command as before, but we set |
143 | * the read taskfile bit, for not executing atacb command, |
144 | * but reading register selected in srb->cmnd[4] |
145 | */ |
146 | srb->cmnd[2] = 1; |
147 | |
148 | usb_stor_transparent_scsi_command(srb, us); |
149 | tmp_result = srb->result; |
150 | scsi_eh_restore_cmnd(srb, &ses); |
151 | /* we fail to get registers, report invalid command */ |
152 | if (tmp_result != SAM_STAT_GOOD) |
153 | goto invalid_fld; |
154 | |
155 | /* build the sense */ |
156 | memset(sb, 0, SCSI_SENSE_BUFFERSIZE); |
157 | |
158 | /* set sk, asc for a good command */ |
159 | sb[1] = RECOVERED_ERROR; |
160 | sb[2] = 0; /* ATA PASS THROUGH INFORMATION AVAILABLE */ |
161 | sb[3] = 0x1D; |
162 | |
163 | /* XXX we should generate sk, asc, ascq from status and error |
164 | * regs |