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/drivers/scsi/pcmcia/nsp_message.c

https://bitbucket.org/cyanogenmod/android_kernel_asus_tf300t
C | 78 lines | 36 code | 16 blank | 26 comment | 5 complexity | 5ee14d3fefc8e7384352680a4b71491d MD5 | raw file
Possible License(s): LGPL-2.0, AGPL-1.0, GPL-2.0
 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
11static 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
53static 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 */