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(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
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 */