Patch to allow XBox-users to use the onboard nve(4) nForce ethernet driver.

The patch crudely forces the NIC out of operating mode before the nve(4)
driver can initialize it; this is required to properly initialize the NIC.

It is XBox-specific, as this condition can only occur on XBoxes (Most loaders
will simply leave the NIC running, forcing us to use a crude workaround like
this to get it in a workable condition). Due to the XBox-only aspect, this has
been solved in XBox-specific initialization code and not within nve(4).

Reviewed by:	imp
Approved by:	imp (mentor)
No objection:	bz@, obrien@, q@ontheweb.com.au

2 files changed, 29 insertions, 1 deletions

diff --git a/sys/i386/conf/XBOX b/sys/i386/conf/XBOX
index eb72d67..8dada56 100644
--- a/sys/i386/conf/XBOX
+++ b/sys/i386/conf/XBOX
@@ -101,3 +101,5 @@ device		rue		# RealTek RTL8150 USB Ethernet
 
 device		sound
 device		snd_ich		# nForce audio
+
+device		nve		# nVidia nForce MCP on-board Ethernet Networking
diff --git a/sys/i386/xbox/xbox.c b/sys/i386/xbox/xbox.c
index b0da531..dae9ba2 100644
--- a/sys/i386/xbox/xbox.c
+++ b/sys/i386/xbox/xbox.c
@@ -27,10 +27,13 @@
  * $FreeBSD$
  */
 #include <sys/param.h>
+#include <sys/systm.h>
 #include <sys/kernel.h>
 #include <sys/eventhandler.h>
 #include <sys/reboot.h>
 #include <machine/xbox.h>
+#include <vm/vm.h>
+#include <vm/pmap.h>
 #include "opt_global.h"
 
 #ifndef I686_CPU
@@ -49,12 +52,35 @@ xbox_poweroff(void* junk, int howto)
 static void
 xbox_init(void)
 {
+	char* ptr;
+
 	if (!arch_i386_is_xbox)
 		return;
 
 	/* register our poweroff function */
 	EVENTHANDLER_REGISTER (shutdown_final, xbox_poweroff, NULL,
 	                       SHUTDOWN_PRI_LAST);
+
+	/*
+	 * Some XBOX loaders, such as Cromwell, have a flaw which cause the
+	 * nve(4) driver to fail attaching to the NIC.
+	 *
+	 * This is because they leave the NIC running; this will cause the
+	 * Nvidia driver to fail as the NIC does not return any sensible
+	 * values and thus fails attaching (using an error 0x5, this means
+	 * it cannot find a valid PHY)
+	 *
+	 * We bluntly tell the NIC to stop whatever it's doing; this makes
+	 * nve(4) attach correctly. As the NIC always resides at
+	 * 0xfef00000-0xfef003ff on an XBOX, we simply hardcode this address.
+	 */
+	ptr = pmap_mapdev (0xfef00000, 0x400);
+	*(uint32_t*)(ptr + 0x188) = 0; /* clear adapter control field */
+	pmap_unmapdev ((vm_offset_t)ptr, 0x400);
 }
 
-SYSINIT(xbox, SI_SUB_CONFIGURE, SI_ORDER_MIDDLE, xbox_init, NULL)
+/*
+ * This must be called before the drivers, as the if_nve(4) driver will fail
+ * if we do not do this in advance.
+ */
+SYSINIT(xbox, SI_SUB_DRIVERS, SI_ORDER_FIRST, xbox_init, NULL)