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, 293 insertions, 0 deletions

diff --git a/sys/powerpc/wii/wii_bus.c b/sys/powerpc/wii/wii_bus.c
new file mode 100644
index 0000000..148da98
--- /dev/null
+++ b/sys/powerpc/wii/wii_bus.c
@@ -0,0 +1,293 @@
+/*-
+ * 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/module.h>
+#include <sys/malloc.h>
+#include <sys/bus.h>
+#include <sys/clock.h>
+#include <sys/cpu.h>
+#include <sys/resource.h>
+#include <sys/rman.h>
+
+#include <vm/vm.h>
+#include <vm/pmap.h>
+
+#include <machine/bus.h>
+#include <machine/platform.h>
+#include <machine/pmap.h>
+#include <machine/resource.h>
+
+#include <powerpc/wii/wii_picreg.h>
+#include <powerpc/wii/wii_fbreg.h>
+#include <powerpc/wii/wii_exireg.h>
+#include <powerpc/wii/wii_ipcreg.h>
+#include <powerpc/wii/wii_gpioreg.h>
+
+static void	wiibus_identify(driver_t *, device_t);
+static int	wiibus_probe(device_t);
+static int	wiibus_attach(device_t);
+static int	wiibus_print_child(device_t, device_t);
+static struct resource *
+		wiibus_alloc_resource(device_t, device_t, int, int *,
+		    unsigned long, unsigned long, unsigned long,
+		    unsigned int);
+static int	wiibus_activate_resource(device_t, device_t, int, int,
+		    struct resource *);
+
+static device_method_t wiibus_methods[] = {
+	/* Device interface */
+	DEVMETHOD(device_identify,	wiibus_identify),
+	DEVMETHOD(device_probe,		wiibus_probe),
+	DEVMETHOD(device_attach,	wiibus_attach),
+
+        /* Bus interface */
+	DEVMETHOD(bus_add_child,	bus_generic_add_child),
+	DEVMETHOD(bus_print_child,	wiibus_print_child),
+	DEVMETHOD(bus_setup_intr,	bus_generic_setup_intr),
+	DEVMETHOD(bus_teardown_intr,	bus_generic_teardown_intr),
+	DEVMETHOD(bus_alloc_resource,   wiibus_alloc_resource),
+	DEVMETHOD(bus_activate_resource,wiibus_activate_resource),
+
+	DEVMETHOD_END
+};
+
+struct wiibus_softc {
+	device_t		sc_dev;
+	struct rman		sc_rman;
+};
+
+static MALLOC_DEFINE(M_WIIBUS, "wiibus", "Nintendo Wii system bus");
+
+struct wiibus_devinfo {
+	struct resource_list	di_resources;
+	uint8_t			di_init;
+};
+
+static driver_t wiibus_driver = {
+	"wiibus",
+	wiibus_methods,
+	sizeof(struct wiibus_softc)
+};
+
+static devclass_t wiibus_devclass;
+
+DRIVER_MODULE(wiibus, nexus, wiibus_driver, wiibus_devclass, 0, 0);
+
+static void
+wiibus_identify(driver_t *driver, device_t parent)
+{
+	if (strcmp(installed_platform(), "wii") != 0)
+		return;
+
+	if (device_find_child(parent, "wiibus", -1) == NULL)
+		BUS_ADD_CHILD(parent, 0, "wiibus", 0);
+}
+
+
+static int
+wiibus_probe(device_t dev)
+{
+        /* Do not attach to any OF nodes that may be present */
+
+	device_set_desc(dev, "Nintendo Wii System Bus");
+
+	return (BUS_PROBE_NOWILDCARD);
+}
+
+static void
+wiibus_init_device_resources(struct rman *rm, struct wiibus_devinfo *dinfo,
+    unsigned int rid, uintptr_t addr, size_t len, unsigned int irq)
+
+{
+	if (!dinfo->di_init) {
+		resource_list_init(&dinfo->di_resources);
+		dinfo->di_init++;
+	}
+	if (addr) {
+		rman_manage_region(rm, addr, addr + len - 1);
+		resource_list_add(&dinfo->di_resources, SYS_RES_MEMORY, rid,
+		    addr, addr + len, len);
+	}
+	if (irq)
+		resource_list_add(&dinfo->di_resources, SYS_RES_IRQ, rid,
+		    irq, irq, 1);
+}
+
+static int
+wiibus_attach(device_t self)
+{
+	struct wiibus_softc *sc;
+	struct wiibus_devinfo *dinfo;
+	device_t cdev;
+
+	sc = device_get_softc(self);
+	sc->sc_rman.rm_type = RMAN_ARRAY;
+	sc->sc_rman.rm_descr = "Wii Bus Memory Mapped I/O";
+	rman_init(&sc->sc_rman);
+
+	/* Nintendo PIC */
+	dinfo = malloc(sizeof(*dinfo), M_WIIBUS, M_WAITOK | M_ZERO);
+	wiibus_init_device_resources(&sc->sc_rman, dinfo, 0, WIIPIC_REG_ADDR,
+	    WIIPIC_REG_LEN, 0);
+	cdev = BUS_ADD_CHILD(self, 0, "wiipic", 0);
+	device_set_ivars(cdev, dinfo);
+
+	/* Framebuffer */
+	dinfo = malloc(sizeof(*dinfo), M_WIIBUS, M_WAITOK | M_ZERO);
+	wiibus_init_device_resources(&sc->sc_rman, dinfo, 0, WIIFB_REG_ADDR,
+	    WIIFB_REG_LEN, 8);
+	wiibus_init_device_resources(&sc->sc_rman, dinfo, 1, WIIFB_FB_ADDR,
+	    WIIFB_FB_LEN, 0);
+	cdev = BUS_ADD_CHILD(self, 0, "wiifb", 0);
+	device_set_ivars(cdev, dinfo);
+
+	/* External Interface Bus */
+	dinfo = malloc(sizeof(*dinfo), M_WIIBUS, M_WAITOK | M_ZERO);
+	wiibus_init_device_resources(&sc->sc_rman, dinfo, 0, WIIEXI_REG_ADDR,
+	    WIIEXI_REG_LEN, 4);
+	cdev = BUS_ADD_CHILD(self, 0, "wiiexi", 0);
+	device_set_ivars(cdev, dinfo);
+
+	/* Nintendo IOS IPC */
+	dinfo = malloc(sizeof(*dinfo), M_WIIBUS, M_WAITOK | M_ZERO);
+	wiibus_init_device_resources(&sc->sc_rman, dinfo, 0, WIIIPC_REG_ADDR,
+	    WIIIPC_REG_LEN, 14);
+	wiibus_init_device_resources(&sc->sc_rman, dinfo, 1, WIIIPC_IOH_ADDR,
+	    WIIIPC_IOH_LEN, 0);
+	cdev = BUS_ADD_CHILD(self, 0, "wiiipc", 0);
+	device_set_ivars(cdev, dinfo);
+
+	/* GPIO */
+	dinfo = malloc(sizeof(*dinfo), M_WIIBUS, M_WAITOK | M_ZERO);
+	wiibus_init_device_resources(&sc->sc_rman, dinfo, 0, WIIGPIO_REG_ADDR,
+	    WIIGPIO_REG_LEN, 0);
+	cdev = BUS_ADD_CHILD(self, 0, "wiigpio", 0);
+	device_set_ivars(cdev, dinfo);
+
+	return (bus_generic_attach(self));
+}
+
+static int
+wiibus_print_child(device_t dev, device_t child)
+{
+	struct wiibus_devinfo *dinfo = device_get_ivars(child);
+	int retval = 0;
+
+	retval += bus_print_child_header(dev, child);
+	retval += resource_list_print_type(&dinfo->di_resources, "mem",
+	    SYS_RES_MEMORY, "%#lx");
+	retval += resource_list_print_type(&dinfo->di_resources, "irq",
+	    SYS_RES_IRQ, "%ld");
+	retval += bus_print_child_footer(dev, child);
+
+	return (retval);
+}
+
+static struct resource *
+wiibus_alloc_resource(device_t bus, device_t child, int type,
+    int *rid, unsigned long start, unsigned long end,
+    unsigned long count, unsigned int flags)
+{
+	struct wiibus_softc *sc;
+	struct wiibus_devinfo *dinfo;
+	struct resource_list_entry *rle;
+	struct resource *rv;
+	int needactivate;
+
+	sc = device_get_softc(bus);
+	dinfo = device_get_ivars(child);
+	needactivate = flags & RF_ACTIVE;
+	flags &= ~RF_ACTIVE;
+
+	switch (type) {
+	case SYS_RES_MEMORY:
+		rle = resource_list_find(&dinfo->di_resources, SYS_RES_MEMORY,
+		    *rid);
+		if (rle == NULL) {
+			device_printf(bus, "no res entry for %s memory 0x%x\n",
+			    device_get_nameunit(child), *rid);
+			return (NULL);
+		}
+		rv = rman_reserve_resource(&sc->sc_rman, rle->start, rle->end,
+		    rle->count, flags, child);
+		if (rv == NULL) {
+			device_printf(bus,
+			    "failed to reserve resource for %s\n",
+			    device_get_nameunit(child));
+			return (NULL);
+		}
+		rman_set_rid(rv, *rid);
+		break;
+	/* XXX IRQ */
+	default:
+		device_printf(bus, "unknown resource request from %s\n",
+		    device_get_nameunit(child));
+		return (NULL);
+	}
+
+	if (needactivate) {
+		if (bus_activate_resource(child, type, *rid, rv) != 0) {
+			device_printf(bus,
+			    "failed to activate resource for %s\n",
+			    device_get_nameunit(child));
+			return (NULL);
+		}
+	}
+	
+	return (rv);
+}
+
+static int
+wiibus_activate_resource(device_t bus, device_t child, int type, int rid,
+    struct resource *res)
+{
+	void *p;
+
+	switch (type) {
+	case SYS_RES_MEMORY:
+		p = pmap_mapdev(rman_get_start(res), rman_get_size(res));
+		if (p == NULL)
+			return (ENOMEM);
+		rman_set_virtual(res, p);
+		rman_set_bustag(res, &bs_be_tag);
+		rman_set_bushandle(res, (unsigned long)p);
+		break;
+	/* XXX IRQ */
+	default:
+		device_printf(bus,
+		    "unknown activate resource request from %s\n",
+		    device_get_nameunit(child));
+		return (ENXIO);
+	}
+	
+	return (rman_activate_resource(res));
+}
+