Initial support for running FreeBSD on the Nintendo Wii. We're able to

reach single user mode using a memory disk device as the file system.

This port includes the framebuffer driver, the PIC driver, a platform
driver and the GPIO driver. The IPC driver (to talk to IOS kernels) is
not yet written but there's a placeholder for it.

There are still some MMU problems and to get a working system you need to
patch locore32.S. Since we haven't found the best way yet to address that
problem, we're not committing those changes yet. The problem is related to
the different BAT layout on the Wii and to the fact that the Homebrew
loader doesn't clean up the special registers (including the 8 BATs)
before passing control to us.

You'll need a Wii with Homebrew loader and a TV that can do NTSC (for now).

Submitted by:	Margarida Gouveia

1 files changed, 152 insertions, 0 deletions

diff --git a/sys/powerpc/wii/platform_wii.c b/sys/powerpc/wii/platform_wii.c
new file mode 100644
index 0000000..78784ed
--- /dev/null
+++ b/sys/powerpc/wii/platform_wii.c
@@ -0,0 +1,152 @@
+/*-
+ * Copyright (C) 2012 Margarida Gouveia
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer,
+ *    without modification, immediately at the beginning of the file.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/bus.h>
+#include <sys/pcpu.h>
+#include <sys/proc.h>
+#include <sys/reboot.h>
+#include <sys/smp.h>
+#include <sys/fbio.h>
+
+#include <vm/vm.h>
+#include <vm/pmap.h>
+
+#include <machine/bus.h>
+#include <machine/cpu.h>
+#include <machine/hid.h>
+#include <machine/platform.h>
+#include <machine/platformvar.h>
+#include <machine/pmap.h>
+#include <machine/smp.h>
+#include <machine/spr.h>
+#include <machine/vmparam.h>
+
+#include <powerpc/wii/wii_fbreg.h>
+
+#include "platform_if.h"
+
+static int		wii_probe(platform_t);
+static int		wii_attach(platform_t);
+static void		wii_mem_regions(platform_t, struct mem_region **,
+			    int *, struct mem_region **, int *);
+static unsigned long	wii_timebase_freq(platform_t, struct cpuref *cpuref);
+static void		wii_reset(platform_t);
+static void		wii_cpu_idle(void);
+
+static platform_method_t wii_methods[] = {
+	PLATFORMMETHOD(platform_probe,		wii_probe),
+	PLATFORMMETHOD(platform_attach,		wii_attach),
+	PLATFORMMETHOD(platform_mem_regions,	wii_mem_regions),
+	PLATFORMMETHOD(platform_timebase_freq,	wii_timebase_freq),
+	PLATFORMMETHOD(platform_reset,		wii_reset),
+ 
+	{ 0, 0 }
+};
+
+static platform_def_t wii_platform = {
+	"wii",
+	wii_methods,
+	0
+};
+
+PLATFORM_DEF(wii_platform);
+
+static int
+wii_probe(platform_t plat)
+{
+	register_t vers = mfpvr();
+
+	/*
+	 * The Wii includes a PowerPC 750CL with custom modifications
+	 * ("Broadway").
+	 * For now, we just assume that if we are running on a
+	 * PowerPC 750CL, then this platform is a Nintendo Wii.
+	 */
+	if ((vers & 0xfffff0e0) == (MPC750 << 16 | MPC750CL))
+		return (BUS_PROBE_SPECIFIC);
+
+	return (ENXIO);
+}
+
+static int
+wii_attach(platform_t plat)
+{
+	cpu_idle_hook = wii_cpu_idle;
+
+	return (0);
+}
+
+#define MEM_REGIONS     2
+static struct mem_region avail_regions[MEM_REGIONS];
+
+static void
+wii_mem_regions(platform_t plat, struct mem_region **phys, int *physsz,
+    struct mem_region **avail, int *availsz)
+{
+	/* 24MB 1T-SRAM */
+	avail_regions[0].mr_start = 0x00000000;
+	avail_regions[0].mr_size  = 0x01800000 - 0x0004000;
+
+	/*
+	 * Reserve space for the framebuffer which is located
+	 * at the end of this 24MB memory region. See wii_fbreg.h.
+	 */
+	avail_regions[0].mr_size -= WIIFB_FB_LEN;
+
+	/* 64MB GDDR3 SDRAM */
+	avail_regions[1].mr_start = 0x10000000 + 0x0004000;
+	avail_regions[1].mr_size  = 0x04000000 - 0x0004000;
+
+	/* XXX for now only use the first memory region */
+#undef MEM_REGIONS
+#define MEM_REGIONS 1
+
+	*phys = *avail = avail_regions;
+	*physsz = *availsz = MEM_REGIONS;
+}
+
+static u_long
+wii_timebase_freq(platform_t plat, struct cpuref *cpuref)
+{
+	
+	/* Bus Frequency (243MHz) / 4 */
+	return (60750000);
+}
+
+static void
+wii_reset(platform_t plat)
+{
+}
+
+static void
+wii_cpu_idle(void)
+{
+}