patch-2.4.8 linux/drivers/scsi/pcmcia/nsp_message.c

• Lines: 77
• Date: Sun Aug 5 13:12:41 2001
• Orig file: v2.4.7/linux/drivers/scsi/pcmcia/nsp_message.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.7/linux/drivers/scsi/pcmcia/nsp_message.c linux/drivers/scsi/pcmcia/nsp_message.c
@@ -0,0 +1,76 @@
+/*==========================================================================
+  NinjaSCSI-3 message handler
+      By: YOKOTA Hiroshi <yokota@netlab.is.tsukuba.ac.jp>
+
+   This software may be used and distributed according to the terms of
+   the GNU Public License.
+ */
+
+/* $Id: nsp_message.c,v 1.6 2001/07/05 10:56:37 elca Exp $ */
+
+static void nsp_message_in(Scsi_Cmnd *SCpnt, nsp_hw_data *data)
+{
+	unsigned int  base = SCpnt->host->io_port;
+	unsigned char data_reg, control_reg;
+	int           ret, len;
+
+	/*
+	 * XXX: NSP QUIRK
+	 * NSP invoke interrupts only in the case of scsi phase changes,
+	 * therefore we should poll the scsi phase here to catch 
+	 * the next "msg in" if exists (no scsi phase changes).
+	 */
+	ret = 16;
+	len = 0;
+
+	DEBUG(0, " msgin loop\n");
+	do {
+		/* read data */
+		data_reg = nsp_index_read(base, SCSIDATAIN);
+
+		/* assert ACK */
+		control_reg = nsp_index_read(base, SCSIBUSCTRL);
+		control_reg |= SCSI_ACK;
+		nsp_index_write(base, SCSIBUSCTRL, control_reg);
+		nsp_negate_signal(SCpnt, BUSMON_REQ, "msgin<REQ>");
+
+		data->MsgBuffer[len] = data_reg; len++;
+
+		/* deassert ACK */
+		control_reg =  nsp_index_read(base, SCSIBUSCTRL);
+		control_reg &= ~SCSI_ACK;
+		nsp_index_write(base, SCSIBUSCTRL, control_reg);
+
+		/* catch a next signal */
+		ret = nsp_expect_signal(SCpnt, BUSPHASE_MESSAGE_IN, BUSMON_REQ);
+	} while (ret > 0 && MSGBUF_SIZE > len);
+
+	data->MsgLen = len;
+
+}
+
+static void nsp_message_out(Scsi_Cmnd *SCpnt, nsp_hw_data *data)
+{
+	int ret = 1;
+	int len = data->MsgLen;
+
+	/*
+	 * XXX: NSP QUIRK
+	 * NSP invoke interrupts only in the case of scsi phase changes,
+	 * therefore we should poll the scsi phase here to catch 
+	 * the next "msg out" if exists (no scsi phase changes).
+	 */
+
+	DEBUG(0, " msgout loop\n");
+	do {
+		if (nsp_xfer(SCpnt, data, BUSPHASE_MESSAGE_OUT)) {
+			printk(KERN_DEBUG " " __FUNCTION__ " msgout: xfer short\n");
+		}
+
+		/* catch a next signal */
+		ret = nsp_expect_signal(SCpnt, BUSPHASE_MESSAGE_OUT, BUSMON_REQ);
+	} while (ret > 0 && len-- > 0);
+
+}
+
+/* end */