Initial import

1 files changed, 78 insertions, 0 deletions

diff --git a/drivers/scsi/pcmcia/nsp_message.c b/drivers/scsi/pcmcia/nsp_message.c
new file mode 100644
index 000000000..ef593b70d
--- /dev/null
+++ b/drivers/scsi/pcmcia/nsp_message.c
@@ -0,0 +1,78 @@
+/*==========================================================================
+  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 General Public License.
+ */
+
+/* $Id: nsp_message.c,v 1.6 2003/07/26 14:21:09 elca Exp $ */
+
+static void nsp_message_in(struct scsi_cmnd *SCpnt)
+{
+	unsigned int  base = SCpnt->device->host->io_port;
+	nsp_hw_data  *data = (nsp_hw_data *)SCpnt->device->host->hostdata;
+	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;
+
+	nsp_dbg(NSP_DEBUG_MSGINOCCUR, "msgin loop");
+	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(struct scsi_cmnd *SCpnt)
+{
+	nsp_hw_data *data = (nsp_hw_data *)SCpnt->device->host->hostdata;
+	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).
+	 */
+
+	nsp_dbg(NSP_DEBUG_MSGOUTOCCUR, "msgout loop");
+	do {
+		if (nsp_xfer(SCpnt, BUSPHASE_MESSAGE_OUT)) {
+			nsp_msg(KERN_DEBUG, "msgout: xfer short");
+		}
+
+		/* catch a next signal */
+		ret = nsp_expect_signal(SCpnt, BUSPHASE_MESSAGE_OUT, BUSMON_REQ);
+	} while (ret > 0 && len-- > 0);
+
+}
+
+/* end */