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 | |
11 | static void nsp_message_in(struct scsi_cmnd *SCpnt) |
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(BaseAddr: base, SCSIDATAIN); |
31 | |
32 | /* assert ACK */ |
33 | control_reg = nsp_index_read(BaseAddr: base, SCSIBUSCTRL); |
34 | control_reg |= SCSI_ACK; |
35 | nsp_index_write(BaseAddr: base, SCSIBUSCTRL, Value: control_reg); |
36 | nsp_negate_signal(SCpnt, BUSMON_REQ, str: "msgin<REQ>" ); |
37 | |
38 | data->MsgBuffer[len] = data_reg; len++; |
39 | |
40 | /* deassert ACK */ |
41 | control_reg = nsp_index_read(BaseAddr: base, SCSIBUSCTRL); |
42 | control_reg &= ~SCSI_ACK; |
43 | nsp_index_write(BaseAddr: base, SCSIBUSCTRL, Value: 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 | |
53 | static void nsp_message_out(struct scsi_cmnd *SCpnt) |
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 */ |
79 | |