freebsd-dev/sys/powerpc/wii/platform_wii.c

/*-
 * 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 <powerpc/wii/wii_ipcreg.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;

	/*
	 * 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;
	avail_regions[1].mr_size  = 0x04000000;

	/*
	 * Reserve space for the DSP.
	 */
	avail_regions[1].mr_start += 0x4000;
	avail_regions[1].mr_size -= 0x4000;

	/*
	 * Reserve space for the IOS I/O memory.
	 */
	avail_regions[1].mr_size -= WIIIPC_IOH_LEN + 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)
{
}