wii.c

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/*
 * arch/powerpc/boot/wii.c
 *
 * Nintendo Wii bootwrapper support
 * Copyright (C) 2008-2009 The GameCube Linux Team
 * Copyright (C) 2008,2009 Albert Herranz
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 */

#include <stddef.h>
#include "stdio.h"
#include "types.h"
#include "io.h"
#include "ops.h"

#include "ugecon.h"

BSS_STACK(8192);

#define HW_REG(x)       ((void *)(x))

#define EXI_CTRL        HW_REG(0x0d800070)
#define EXI_CTRL_ENABLE     (1<<0)

#define MEM2_TOP        (0x10000000 + 64*1024*1024)
#define FIRMWARE_DEFAULT_SIZE   (12*1024*1024)


struct mipc_infohdr {
    char magic[3];
    u8 version;
    u32 mem2_boundary;
    u32 ipc_in;
    size_t ipc_in_size;
    u32 ipc_out;
    size_t ipc_out_size;
};

static int mipc_check_address(u32 pa)
{
    /* only MEM2 addresses */
    if (pa < 0x10000000 || pa > 0x14000000)
        return -EINVAL;
    return 0;
}

static struct mipc_infohdr *mipc_get_infohdr(void)
{
    struct mipc_infohdr **hdrp, *hdr;

    /* 'mini' header pointer is the last word of MEM2 memory */
    hdrp = (struct mipc_infohdr **)0x13fffffc;
    if (mipc_check_address((u32)hdrp)) {
        printf("mini: invalid hdrp %08X\n", (u32)hdrp);
        hdr = NULL;
        goto out;
    }

    hdr = *hdrp;
    if (mipc_check_address((u32)hdr)) {
        printf("mini: invalid hdr %08X\n", (u32)hdr);
        hdr = NULL;
        goto out;
    }
    if (memcmp(hdr->magic, "IPC", 3)) {
        printf("mini: invalid magic\n");
        hdr = NULL;
        goto out;
    }

out:
    return hdr;
}

static int mipc_get_mem2_boundary(u32 *mem2_boundary)
{
    struct mipc_infohdr *hdr;
    int error;

    hdr = mipc_get_infohdr();
    if (!hdr) {
        error = -1;
        goto out;
    }

    if (mipc_check_address(hdr->mem2_boundary)) {
        printf("mini: invalid mem2_boundary %08X\n",
               hdr->mem2_boundary);
        error = -EINVAL;
        goto out;
    }
    *mem2_boundary = hdr->mem2_boundary;
    error = 0;
out:
    return error;

}

static void platform_fixups(void)
{
    void *mem;
    u32 reg[4];
    u32 mem2_boundary;
    int len;
    int error;

    mem = finddevice("/memory");
    if (!mem)
        fatal("Can't find memory node\n");

    /* two ranges of (address, size) words */
    len = getprop(mem, "reg", reg, sizeof(reg));
    if (len != sizeof(reg)) {
        /* nothing to do */
        goto out;
    }

    /* retrieve MEM2 boundary from 'mini' */
    error = mipc_get_mem2_boundary(&mem2_boundary);
    if (error) {
        /* if that fails use a sane value */
        mem2_boundary = MEM2_TOP - FIRMWARE_DEFAULT_SIZE;
    }

    if (mem2_boundary > reg[2] && mem2_boundary < reg[2] + reg[3]) {
        reg[3] = mem2_boundary - reg[2];
        printf("top of MEM2 @ %08X\n", reg[2] + reg[3]);
        setprop(mem, "reg", reg, sizeof(reg));
    }

out:
    return;
}

void platform_init(unsigned long r3, unsigned long r4, unsigned long r5)
{
    u32 heapsize = 24*1024*1024 - (u32)_end;

    simple_alloc_init(_end, heapsize, 32, 64);
    fdt_init(_dtb_start);

    /*
     * 'mini' boots the Broadway processor with EXI disabled.
     * We need it enabled before probing for the USB Gecko.
     */
    out_be32(EXI_CTRL, in_be32(EXI_CTRL) | EXI_CTRL_ENABLE);

    if (ug_probe())
        console_ops.write = ug_console_write;

    platform_ops.fixups = platform_fixups;
}