>Number:         21965
>Category:       kern
>Synopsis:       AM79c978 (PCnet-Home) HomePna card does not work with 1.6.1/if_pcn
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Jun 23 04:50:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     Austin K. Kurahone
>Release:        1.6.1
>Organization:
>Environment:
NetBSD thoth.private.sigusr1.org 1.6.1 NetBSD 1.6.1 (THOTH) #8: Sun Jun 22 20:27:17 PDT 2003 root@thoth.private.sigusr1.org:/usr/src/sys/arch/i386/compile/THOTH i386
>Description:
PCI NICS based around the AMD AM79c978 (PCnet-Home) chip are not currently supported under NetBSD 1.6.1.

The AM79c978 supports 10BaseT Ethernet and HomePNA 1.0 (Ethernet over RJ-11), several cards use this chipset including the Linksys HPN100, and the Diamond Multimedia HomeFree.
>How-To-Repeat:
Install NetBSD 1.6.1 and a kernel with if_pcn and pnaphy compiled in.  The card will come up as unsupported.
>Fix:
The following patch adds support for the chip.  Currently due to a caveat with how the pnaphy MII implementation works, only the HomePNA PHY is supported.

Bugs: Under heavy load the card sees CRC errors and watchdog timeouts.  The system recovers properly however.  I'm not sure if this is a problem with the card, or HomePNA in general. (The card also experiences this issue under FreeBSD-4.8, but worse, and "seems" to work properly in windows.)

--- if_pcn.c.org	Sat Jun 21 17:12:10 2003
+++ if_pcn.c	Sat Jun 21 20:09:26 2003
@@ -36,6 +36,18 @@
  */
 
 /*
+ * AMD AM79c978 Support: Austin K. Kurahone <kurahone@sigusr1.org>
+ * Copyright (c) 2003 All Rights Reserved.
+ *
+ * This code is hereby placed in the public domain.
+ *
+ * Please note that even if you have a AM79c978 with an integrated
+ * Ethernet PHY, due to the way that pnaphy works, only the HomePNA
+ * media option will be accesible.
+ *
+ */
+
+/*
  * Device driver for the AMD PCnet-PCI series of Ethernet
  * chips:
  *
@@ -54,6 +66,8 @@
  *	* Am79c973/Am79c975 PCnet-FAST III Single-Chip 10/100Mbps PCI
  *	  Ethernet Controller with Integrated PHY
  *
+ *	* AM79c978 PCnet-Home PCI Ethernet Controller with HomePNA 1.0 PHY
+ *
  * This also supports the virtual PCnet-PCI Ethernet interface found
  * in VMware.
  *
@@ -416,6 +430,8 @@
 int	pcn_79c971_mediachange(struct ifnet *);
 void	pcn_79c971_mediastatus(struct ifnet *, struct ifmediareq *);
 
+void	pcn_79c978_mediainit(struct pcn_softc *);
+
 /*
  * Description of a PCnet-PCI variant.  Used to select media access
  * method, mostly, and to print a nice description of the chip.
@@ -449,6 +465,10 @@
 	  pcn_79c971_mediainit,
 	  PARTID_Am79c975 },
 
+	{ "Am79c978 PCnet-Home",
+	  pcn_79c978_mediainit,
+	  PARTID_Am79c978 },
+
 	{ "Unknown PCnet-PCI variant",
 	  pcn_79c971_mediainit,
 	  0 },
@@ -526,6 +546,7 @@
 
 	switch (PCI_PRODUCT(pa->pa_id)) {
 	case PCI_PRODUCT_AMD_PCNET_PCI:
+	case PCI_PRODUCT_AMD_PCNET_HOME:
 		/* Beat if_le_pci.c */
 		return (10);
 	}
@@ -2104,6 +2125,44 @@
 	if (ifp->if_flags & IFF_UP)
 		mii_mediachg(&sc->sc_mii);
 	return (0);
+}
+
+/*
+ * pcn_79c978_mediainit: 
+ *
+ *	Initialize media for Am79c978. 
+ *
+ */
+void
+pcn_79c978_mediainit(struct pcn_softc *sc)
+{
+	struct ifnet *ifp = &sc->sc_ethercom.ec_if;
+
+	/* We have MII. */
+	sc->sc_flags |= PCN_F_HAS_MII;
+
+	/*
+	 * The built-in HomePNA interface is mapped to the MII
+	 * on the PCNet-Home.
+	 */
+	sc->sc_phyaddr = -1;
+
+	/* Initialize our media structures and probe the MII. */
+	sc->sc_mii.mii_ifp = ifp;
+	sc->sc_mii.mii_readreg = pcn_mii_readreg;
+	sc->sc_mii.mii_writereg = pcn_mii_writereg;
+	sc->sc_mii.mii_statchg = pcn_mii_statchg;
+	ifmedia_init(&sc->sc_mii.mii_media, 0, pcn_79c971_mediachange,
+	    pcn_79c971_mediastatus);
+
+	mii_attach(&sc->sc_dev, &sc->sc_mii, 0xffffffff, MII_PHY_ANY,
+	    MII_OFFSET_ANY, 0);
+	if (LIST_FIRST(&sc->sc_mii.mii_phys) == NULL) {
+		ifmedia_add(&sc->sc_mii.mii_media, IFM_ETHER|IFM_HPNA_1,
+			0, NULL);
+		ifmedia_set(&sc->sc_mii.mii_media, IFM_ETHER|IFM_NONE);
+	} else
+		ifmedia_set(&sc->sc_mii.mii_media, IFM_ETHER|IFM_HPNA_1);
 }
 
 /*
>Release-Note:
>Audit-Trail:
>Unformatted: