From 6fb58044fdc7936b5bfa059b8bcfceb1cc986954 Mon Sep 17 00:00:00 2001
From: thorpej <thorpej@NetBSD.org>
Date: Sun, 5 May 1996 01:14:07 +0000
Subject: [PATCH] Map port 0x84 (which is used to generate a 2.6us delay) in
 isaattach(). Since this port is needed by at least a few drivers, export its
 i/o handle via isa_attach_args.

---
 sys/dev/isa/isa.c    | 10 +++++++++-
 sys/dev/isa/isavar.h | 12 +++++++++++-
 2 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/sys/dev/isa/isa.c b/sys/dev/isa/isa.c
index 0e8dfd76a89e..83c170ca9d5e 100644
--- a/sys/dev/isa/isa.c
+++ b/sys/dev/isa/isa.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: isa.c,v 1.81 1996/04/29 20:03:24 christos Exp $	*/
+/*	$NetBSD: isa.c,v 1.82 1996/05/05 01:14:07 thorpej Exp $	*/
 
 /*-
  * Copyright (c) 1993, 1994 Charles Hannum.  All rights reserved.
@@ -84,6 +84,13 @@ isaattach(parent, self, aux)
 	sc->sc_bc = iba->iba_bc;
 	sc->sc_ic = iba->iba_ic;
 
+	/*
+	 * Map port 0x84, which causes a 2.5us delay when read.
+	 * We do this now, since several drivers need it.
+	 */
+	if (bus_io_map(sc->sc_bc, 0x84, 1, &sc->sc_delayioh))
+		panic("isaattach: can't map `delay port'");	/* XXX */
+
 	TAILQ_INIT(&sc->sc_subdevs);
 	config_scan(isascan, self);
 }
@@ -131,6 +138,7 @@ isascan(parent, match)
 	ia.ia_msize = cf->cf_loc[3];
 	ia.ia_irq = cf->cf_loc[4] == 2 ? 9 : cf->cf_loc[4];
 	ia.ia_drq = cf->cf_loc[5];
+	ia.ia_delayioh = sc->sc_delayioh;
 
 	if ((*cf->cf_attach->ca_match)(parent, dev, &ia) > 0)
 		config_attach(parent, dev, &ia, isaprint);
diff --git a/sys/dev/isa/isavar.h b/sys/dev/isa/isavar.h
index 6d3e9cca67f3..b22f2e71ef06 100644
--- a/sys/dev/isa/isavar.h
+++ b/sys/dev/isa/isavar.h
@@ -1,4 +1,4 @@
-/*	$NetBSD: isavar.h,v 1.21 1996/04/11 22:20:50 cgd Exp $	*/
+/*	$NetBSD: isavar.h,v 1.22 1996/05/05 01:14:14 thorpej Exp $	*/
 
 /*
  * Copyright (c) 1995 Chris G. Demetriou
@@ -84,6 +84,8 @@ struct isa_attach_args {
 	int	ia_maddr;		/* physical i/o mem addr */
 	u_int	ia_msize;		/* size of i/o memory */
 	void	*ia_aux;		/* driver specific */
+
+	bus_io_handle_t ia_delayioh;	/* i/o handle for `delay port' */
 };
 
 #define	IOBASEUNK	-1		/* i/o address is unknown */
@@ -110,6 +112,14 @@ struct isa_softc {
 
 	bus_chipset_tag_t sc_bc;
 	isa_chipset_tag_t sc_ic;
+
+	/*
+	 * This i/o handle is used to map port 0x84, which is
+	 * read to provide a 2.5us delay.  This i/o handle
+	 * is mapped in isaattach(), and exported to drivers
+	 * via isa_attach_args.
+	 */
+	bus_io_handle_t   sc_delayioh;
 };
 
 #define		cf_iobase		cf_loc[0]