From 22abcef12ee6ae58579aa09601d44d9bc745ee05 Mon Sep 17 00:00:00 2001
From: Patrick Wildt <patrick@cvs.openbsd.org>
Date: Thu, 25 Jun 2020 12:35:22 +0000
Subject: Add a "framework" for MII busses.

ok kettenis@
---
 sys/dev/ofw/ofw_misc.c | 38 +++++++++++++++++++++++++++++++++++++-
 sys/dev/ofw/ofw_misc.h | 16 +++++++++++++++-
 2 files changed, 52 insertions(+), 2 deletions(-)

diff --git a/sys/dev/ofw/ofw_misc.c b/sys/dev/ofw/ofw_misc.c
index f4ca92260e5..3790f2a13d6 100644
--- a/sys/dev/ofw/ofw_misc.c
+++ b/sys/dev/ofw/ofw_misc.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: ofw_misc.c,v 1.21 2020/06/10 23:43:06 patrick Exp $	*/
+/*	$OpenBSD: ofw_misc.c,v 1.22 2020/06/25 12:35:21 patrick Exp $	*/
 /*
  * Copyright (c) 2017 Mark Kettenis
  *
@@ -687,3 +687,39 @@ dai_byphandle(uint32_t phandle)
 
 	return NULL;
 }
+
+/* MII support */
+
+LIST_HEAD(, mii_bus) mii_busses =
+	LIST_HEAD_INITIALIZER(mii_busses);
+
+void
+mii_register(struct mii_bus *md)
+{
+	LIST_INSERT_HEAD(&mii_busses, md, md_list);
+}
+
+struct mii_bus *
+mii_byphandle(uint32_t phandle)
+{
+	struct mii_bus *md;
+	int node;
+
+	if (phandle == 0)
+		return NULL;
+
+	node = OF_getnodebyphandle(phandle);
+	if (node == 0)
+		return NULL;
+
+	node = OF_parent(node);
+	if (node == 0)
+		return NULL;
+
+	LIST_FOREACH(md, &mii_busses, md_list) {
+		if (md->md_node == node)
+			return md;
+	}
+
+	return NULL;
+}
diff --git a/sys/dev/ofw/ofw_misc.h b/sys/dev/ofw/ofw_misc.h
index 8c7ff7e1d63..6d462b31cd4 100644
--- a/sys/dev/ofw/ofw_misc.h
+++ b/sys/dev/ofw/ofw_misc.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: ofw_misc.h,v 1.13 2020/06/10 23:43:06 patrick Exp $	*/
+/*	$OpenBSD: ofw_misc.h,v 1.14 2020/06/25 12:35:21 patrick Exp $	*/
 /*
  * Copyright (c) 2017 Mark Kettenis
  *
@@ -213,4 +213,18 @@ struct dai_device *dai_byphandle(uint32_t);
 #define DAI_CLOCK_CFS			(0 << 1)
 #define DAI_CLOCK_CFM			(1 << 1)
 
+/* MII support */
+
+struct mii_bus {
+	int	md_node;
+	void	*md_cookie;
+	int	(*md_readreg)(struct device *, int, int);
+	void	(*md_writereg)(struct device *, int, int, int);
+
+	LIST_ENTRY(mii_bus) md_list;
+};
+
+void	mii_register(struct mii_bus *);
+struct mii_bus *mii_byphandle(uint32_t);
+
 #endif /* _DEV_OFW_MISC_H_ */
-- 
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