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 */
79