LXR linux/arch/powerpc/boot/wii.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * arch/powerpc/boot/wii.c
   4 *
   5 * Nintendo Wii bootwrapper support
   6 * Copyright (C) 2008-2009 The GameCube Linux Team
   7 * Copyright (C) 2008,2009 Albert Herranz
   8 */
   9
  10#include <stddef.h>
  11#include "stdio.h"
  12#include "types.h"
  13#include "io.h"
  14#include "ops.h"
  15
  16#include "ugecon.h"
  17
  18BSS_STACK(8192);
  19
  20#define HW_REG(x)               ((void *)(x))
  21
  22#define EXI_CTRL                HW_REG(0x0d800070)
  23#define EXI_CTRL_ENABLE         (1<<0)
  24
  25#define MEM2_TOP                (0x10000000 + 64*1024*1024)
  26#define FIRMWARE_DEFAULT_SIZE   (12*1024*1024)
  27
  28
  29struct mipc_infohdr {
  30        char magic[3];
  31        u8 version;
  32        u32 mem2_boundary;
  33        u32 ipc_in;
  34        size_t ipc_in_size;
  35        u32 ipc_out;
  36        size_t ipc_out_size;
  37};
  38
  39static int mipc_check_address(u32 pa)
  40{
  41        /* only MEM2 addresses */
  42        if (pa < 0x10000000 || pa > 0x14000000)
  43                return -EINVAL;
  44        return 0;
  45}
  46
  47static struct mipc_infohdr *mipc_get_infohdr(void)
  48{
  49        struct mipc_infohdr **hdrp, *hdr;
  50
  51        /* 'mini' header pointer is the last word of MEM2 memory */
  52        hdrp = (struct mipc_infohdr **)0x13fffffc;
  53        if (mipc_check_address((u32)hdrp)) {
  54                printf("mini: invalid hdrp %08X\n", (u32)hdrp);
  55                hdr = NULL;
  56                goto out;
  57        }
  58
  59        hdr = *hdrp;
  60        if (mipc_check_address((u32)hdr)) {
  61                printf("mini: invalid hdr %08X\n", (u32)hdr);
  62                hdr = NULL;
  63                goto out;
  64        }
  65        if (memcmp(hdr->magic, "IPC", 3)) {
  66                printf("mini: invalid magic\n");
  67                hdr = NULL;
  68                goto out;
  69        }
  70
  71out:
  72        return hdr;
  73}
  74
  75static int mipc_get_mem2_boundary(u32 *mem2_boundary)
  76{
  77        struct mipc_infohdr *hdr;
  78        int error;
  79
  80        hdr = mipc_get_infohdr();
  81        if (!hdr) {
  82                error = -1;
  83                goto out;
  84        }
  85
  86        if (mipc_check_address(hdr->mem2_boundary)) {
  87                printf("mini: invalid mem2_boundary %08X\n",
  88                       hdr->mem2_boundary);
  89                error = -EINVAL;
  90                goto out;
  91        }
  92        *mem2_boundary = hdr->mem2_boundary;
  93        error = 0;
  94out:
  95        return error;
  96
  97}
  98
  99static void platform_fixups(void)
 100{
 101        void *mem;
 102        u32 reg[4];
 103        u32 mem2_boundary;
 104        int len;
 105        int error;
 106
 107        mem = finddevice("/memory");
 108        if (!mem)
 109                fatal("Can't find memory node\n");
 110
 111        /* two ranges of (address, size) words */
 112        len = getprop(mem, "reg", reg, sizeof(reg));
 113        if (len != sizeof(reg)) {
 114                /* nothing to do */
 115                goto out;
 116        }
 117
 118        /* retrieve MEM2 boundary from 'mini' */
 119        error = mipc_get_mem2_boundary(&mem2_boundary);
 120        if (error) {
 121                /* if that fails use a sane value */
 122                mem2_boundary = MEM2_TOP - FIRMWARE_DEFAULT_SIZE;
 123        }
 124
 125        if (mem2_boundary > reg[2] && mem2_boundary < reg[2] + reg[3]) {
 126                reg[3] = mem2_boundary - reg[2];
 127                printf("top of MEM2 @ %08X\n", reg[2] + reg[3]);
 128                setprop(mem, "reg", reg, sizeof(reg));
 129        }
 130
 131out:
 132        return;
 133}
 134
 135void platform_init(unsigned long r3, unsigned long r4, unsigned long r5)
 136{
 137        u32 heapsize = 24*1024*1024 - (u32)_end;
 138
 139        simple_alloc_init(_end, heapsize, 32, 64);
 140        fdt_init(_dtb_start);
 141
 142        /*
 143         * 'mini' boots the Broadway processor with EXI disabled.
 144         * We need it enabled before probing for the USB Gecko.
 145         */
 146        out_be32(EXI_CTRL, in_be32(EXI_CTRL) | EXI_CTRL_ENABLE);
 147
 148        if (ug_probe())
 149                console_ops.write = ug_console_write;
 150
 151        platform_ops.fixups = platform_fixups;
 152}
 153
 154