Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /*========================================================================== |
2 | NinjaSCSI-3 message handler | |
3 | By: YOKOTA Hiroshi <yokota@netlab.is.tsukuba.ac.jp> | |
4 | ||
5 | This software may be used and distributed according to the terms of | |
6 | the GNU General Public License. | |
7 | */ | |
8 | ||
9 | /* $Id: nsp_message.c,v 1.6 2003/07/26 14:21:09 elca Exp $ */ | |
10 | ||
0fc82d5e | 11 | static void nsp_message_in(struct scsi_cmnd *SCpnt) |
1da177e4 LT |
12 | { |
13 | unsigned int base = SCpnt->device->host->io_port; | |
14 | nsp_hw_data *data = (nsp_hw_data *)SCpnt->device->host->hostdata; | |
15 | unsigned char data_reg, control_reg; | |
16 | int ret, len; | |
17 | ||
18 | /* | |
19 | * XXX: NSP QUIRK | |
20 | * NSP invoke interrupts only in the case of scsi phase changes, | |
21 | * therefore we should poll the scsi phase here to catch | |
22 | * the next "msg in" if exists (no scsi phase changes). | |
23 | */ | |
24 | ret = 16; | |
25 | len = 0; | |
26 | ||
27 | nsp_dbg(NSP_DEBUG_MSGINOCCUR, "msgin loop"); | |
28 | do { | |
29 | /* read data */ | |
30 | data_reg = nsp_index_read(base, SCSIDATAIN); | |
31 | ||
32 | /* assert ACK */ | |
33 | control_reg = nsp_index_read(base, SCSIBUSCTRL); | |
34 | control_reg |= SCSI_ACK; | |
35 | nsp_index_write(base, SCSIBUSCTRL, control_reg); | |
36 | nsp_negate_signal(SCpnt, BUSMON_REQ, "msgin<REQ>"); | |
37 | ||
38 | data->MsgBuffer[len] = data_reg; len++; | |
39 | ||
40 | /* deassert ACK */ | |
41 | control_reg = nsp_index_read(base, SCSIBUSCTRL); | |
42 | control_reg &= ~SCSI_ACK; | |
43 | nsp_index_write(base, SCSIBUSCTRL, control_reg); | |
44 | ||
45 | /* catch a next signal */ | |
46 | ret = nsp_expect_signal(SCpnt, BUSPHASE_MESSAGE_IN, BUSMON_REQ); | |
47 | } while (ret > 0 && MSGBUF_SIZE > len); | |
48 | ||
49 | data->MsgLen = len; | |
50 | ||
51 | } | |
52 | ||
0fc82d5e | 53 | static void nsp_message_out(struct scsi_cmnd *SCpnt) |
1da177e4 LT |
54 | { |
55 | nsp_hw_data *data = (nsp_hw_data *)SCpnt->device->host->hostdata; | |
56 | int ret = 1; | |
57 | int len = data->MsgLen; | |
58 | ||
59 | /* | |
60 | * XXX: NSP QUIRK | |
61 | * NSP invoke interrupts only in the case of scsi phase changes, | |
62 | * therefore we should poll the scsi phase here to catch | |
63 | * the next "msg out" if exists (no scsi phase changes). | |
64 | */ | |
65 | ||
66 | nsp_dbg(NSP_DEBUG_MSGOUTOCCUR, "msgout loop"); | |
67 | do { | |
68 | if (nsp_xfer(SCpnt, BUSPHASE_MESSAGE_OUT)) { | |
69 | nsp_msg(KERN_DEBUG, "msgout: xfer short"); | |
70 | } | |
71 | ||
72 | /* catch a next signal */ | |
73 | ret = nsp_expect_signal(SCpnt, BUSPHASE_MESSAGE_OUT, BUSMON_REQ); | |
74 | } while (ret > 0 && len-- > 0); | |
75 | ||
76 | } | |
77 | ||
78 | /* end */ |