From 91b4a6d40112cf7c6838e436ebe8516912adb8a2 Mon Sep 17 00:00:00 2001
From: thorpej <thorpej@NetBSD.org>
Date: Tue, 30 Apr 1996 22:16:27 +0000
Subject: [PATCH] Adapt the elink_reset() and elink_idseq() routines for
 <machine/bus.h>. In elink_reset(), since some machines may have more than one
 ISA bus, implement a way of keeping track of which ISA bus has received an
 elink_reset(); The static variable which was used previously didn't scale.

---
 sys/dev/isa/elink.c | 75 +++++++++++++++++++++++++++++++++++++--------
 sys/dev/isa/elink.h |  6 ++--
 2 files changed, 65 insertions(+), 16 deletions(-)

diff --git a/sys/dev/isa/elink.c b/sys/dev/isa/elink.c
index d33a000f21b6..bed475d1b36d 100644
--- a/sys/dev/isa/elink.c
+++ b/sys/dev/isa/elink.c
@@ -1,6 +1,7 @@
-/*	$NetBSD: elink.c,v 1.7 1995/01/29 07:36:56 cgd Exp $	*/
+/*	$NetBSD: elink.c,v 1.8 1996/04/30 22:16:27 thorpej Exp $	*/
 
 /*
+ * Copyright (c) 1996 Jason R. Thorpe.  All rights reserved.
  * Copyright (c) 1994, 1995 Charles Hannum.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -33,34 +34,82 @@
  * Common code for dealing with 3COM ethernet cards.
  */
 
-#include <sys/types.h>
-#include <machine/pio.h>
+#include <sys/param.h>
+#include <sys/malloc.h>
+#include <sys/queue.h>
+
+#include <machine/bus.h>
+
 #include <dev/isa/elink.h>
 
+/*
+ * This list keeps track of which ISAs have gotten an elink_reset().
+ */
+struct elink_done_reset {
+	LIST_ENTRY(elink_done_reset)	er_link;
+	int				er_bus;
+};
+static LIST_HEAD(, elink_done_reset) elink_all_resets;
+static int elink_all_resets_initialized;
+
 /*
  * Issue a `global reset' to all cards, and reset the ID state machines.  We
  * have to be careful to do the global reset only once during autoconfig, to
  * prevent resetting boards that have already been configured.
+ *
+ * The "bus" argument here is the unit number of the ISA bus, e.g. "0"
+ * if the bus is "isa0".
+ *
+ * NOTE: the caller MUST provide an i/o handle for ELINK_ID_PORT!
  */
 void
-elink_reset()
-{  
-	static int x = 0;
+elink_reset(bc, ioh, bus)
+	bus_chipset_tag_t bc;
+	bus_io_handle_t ioh;
+	int bus;
+{
+	struct elink_done_reset *er;
 
-	if (x == 0) {
-		x = 1;
-		outb(ELINK_ID_PORT, ELINK_RESET);
+	if (elink_all_resets_initialized == 0) {
+		LIST_INIT(&elink_all_resets);
+		elink_all_resets_initialized = 1;
 	}
-	outb(ELINK_ID_PORT, 0x00);
-	outb(ELINK_ID_PORT, 0x00);
+
+	/*
+	 * Reset these cards if we haven't done so already.
+	 */
+	for (er = elink_all_resets.lh_first; er != NULL;
+	    er = er->er_link.le_next)
+		if (er->er_bus == bus)
+			goto out;
+
+	/* Mark this bus so we don't do it again. */
+	er = (struct elink_done_reset *)malloc(sizeof(struct elink_done_reset),
+	    M_DEVBUF, M_NOWAIT);
+	if (er == NULL)
+		panic("elink_reset: can't allocate state storage");
+
+	er->er_bus = bus;
+	LIST_INSERT_HEAD(&elink_all_resets, er, er_link);
+
+	/* Haven't reset the cards on this bus, yet. */
+	bus_io_write_1(bc, ioh, 0, ELINK_RESET);
+
+ out:
+	bus_io_write_1(bc, ioh, 0, 0x00);
+	bus_io_write_1(bc, ioh, 0, 0x00);
 }
 
 /*
  * The `ID sequence' is really just snapshots of an 8-bit CRC register as 0
  * bits are shifted in.  Different board types use different polynomials.
+ *
+ * NOTE: the caller MUST provide an i/o handle for ELINK_ID_PORT!
  */
 void
-elink_idseq(p)
+elink_idseq(bc, ioh, p)
+	bus_chipset_tag_t bc;
+	bus_io_handle_t ioh;
 	register u_char p;
 {
 	register int i;
@@ -68,7 +117,7 @@ elink_idseq(p)
 
 	c = 0xff;
 	for (i = 255; i; i--) {
-		outb(ELINK_ID_PORT, c);
+		bus_io_write_1(bc, ioh, 0, c);
 		if (c & 0x80) {
 			c <<= 1;
 			c ^= p;
diff --git a/sys/dev/isa/elink.h b/sys/dev/isa/elink.h
index c2af300887e9..e4934ef09d07 100644
--- a/sys/dev/isa/elink.h
+++ b/sys/dev/isa/elink.h
@@ -1,4 +1,4 @@
-/*	$NetBSD: elink.h,v 1.3 1994/10/27 04:17:11 cgd Exp $	*/
+/*	$NetBSD: elink.h,v 1.4 1996/04/30 22:16:31 thorpej Exp $	*/
 
 /*
  * Copyright (c) 1994 Charles Hannum.  All rights reserved.
@@ -35,5 +35,5 @@
 #define	ELINK_507_POLY	0xe7
 #define	ELINK_509_POLY	0xcf
 
-void elink_reset __P((void));
-void elink_idseq __P((u_char p));
+void elink_reset __P((bus_chipset_tag_t, bus_io_handle_t, int));
+void elink_idseq __P((bus_chipset_tag_t, bus_io_handle_t, u_char p));