From 87d2c32cebe5c2ed26d29f4d8c4e7972205b0ee5 Mon Sep 17 00:00:00 2001
From: bde <bde@FreeBSD.org>
Date: Sat, 30 Nov 1996 15:29:31 +0000
Subject: Reset h/w fifos (if any) in siostop().  Now ttyflush() works fairly
 well with sio devices (not perfectly, since there is no way to flush the tx
 holding register on 8250-16450's.  I'm not sure if resetting the fifos
 flushes the tx shift register).

Reminded by:	NIST-PCTS
---
 sys/dev/sio/sio.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

(limited to 'sys/dev/sio/sio.c')

diff --git a/sys/dev/sio/sio.c b/sys/dev/sio/sio.c
index d4125c3..0b70455 100644
--- a/sys/dev/sio/sio.c
+++ b/sys/dev/sio/sio.c
@@ -31,7 +31,7 @@
  * SUCH DAMAGE.
  *
  *	from: @(#)com.c	7.5 (Berkeley) 5/16/91
- *	$Id: sio.c,v 1.151 1996/11/30 15:03:05 bde Exp $
+ *	$Id: sio.c,v 1.152 1996/11/30 15:19:19 bde Exp $
  */
 
 #include "opt_comconsole.h"
@@ -2123,6 +2123,10 @@ siostop(tp, rw)
 		return;
 	disable_intr();
 	if (rw & FWRITE) {
+		if (com->hasfifo)
+			/* XXX does this flush everything? */
+			outb(com->iobase + com_fifo,
+			     FIFO_XMT_RST | com->fifo_image);
 		com->obufs[0].l_queued = FALSE;
 		com->obufs[1].l_queued = FALSE;
 		if (com->state & CS_ODONE)
@@ -2131,13 +2135,15 @@ siostop(tp, rw)
 		com->tp->t_state &= ~TS_BUSY;
 	}
 	if (rw & FREAD) {
+		if (com->hasfifo)
+			/* XXX does this flush everything? */
+			outb(com->iobase + com_fifo,
+			     FIFO_RCV_RST | com->fifo_image);
 		com_events -= (com->iptr - com->ibuf);
 		com->iptr = com->ibuf;
 	}
 	enable_intr();
 	comstart(tp);
-
-	/* XXX should clear h/w fifos too. */
 }
 
 static struct tty *
-- 
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