powerpc/boot/wii.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * arch/powerpc/boot/wii.c
0004  *
0005  * Nintendo Wii bootwrapper support
0006  * Copyright (C) 2008-2009 The GameCube Linux Team
0007  * Copyright (C) 2008,2009 Albert Herranz
0008  */
0009
0010 #include <stddef.h>
0011 #include "stdio.h"
0012 #include "types.h"
0013 #include "io.h"
0014 #include "ops.h"
0015
0016 #include "ugecon.h"
0017
0018 BSS_STACK(8192);
0019
0020 #define HW_REG(x)       ((void *)(x))
0021
0022 #define EXI_CTRL        HW_REG(0x0d800070)
0023 #define EXI_CTRL_ENABLE     (1<<0)
0024
0025 #define MEM2_TOP        (0x10000000 + 64*1024*1024)
0026 #define FIRMWARE_DEFAULT_SIZE   (12*1024*1024)
0027
0028
0029 struct mipc_infohdr {
0030     char magic[3];
0031     u8 version;
0032     u32 mem2_boundary;
0033     u32 ipc_in;
0034     size_t ipc_in_size;
0035     u32 ipc_out;
0036     size_t ipc_out_size;
0037 };
0038
0039 static int mipc_check_address(u32 pa)
0040 {
0041     /* only MEM2 addresses */
0042     if (pa < 0x10000000 || pa > 0x14000000)
0043         return -EINVAL;
0044     return 0;
0045 }
0046
0047 static struct mipc_infohdr *mipc_get_infohdr(void)
0048 {
0049     struct mipc_infohdr **hdrp, *hdr;
0050
0051     /* 'mini' header pointer is the last word of MEM2 memory */
0052     hdrp = (struct mipc_infohdr **)0x13fffffc;
0053     if (mipc_check_address((u32)hdrp)) {
0054         printf("mini: invalid hdrp %08X\n", (u32)hdrp);
0055         hdr = NULL;
0056         goto out;
0057     }
0058
0059     hdr = *hdrp;
0060     if (mipc_check_address((u32)hdr)) {
0061         printf("mini: invalid hdr %08X\n", (u32)hdr);
0062         hdr = NULL;
0063         goto out;
0064     }
0065     if (memcmp(hdr->magic, "IPC", 3)) {
0066         printf("mini: invalid magic\n");
0067         hdr = NULL;
0068         goto out;
0069     }
0070
0071 out:
0072     return hdr;
0073 }
0074
0075 static int mipc_get_mem2_boundary(u32 *mem2_boundary)
0076 {
0077     struct mipc_infohdr *hdr;
0078     int error;
0079
0080     hdr = mipc_get_infohdr();
0081     if (!hdr) {
0082         error = -1;
0083         goto out;
0084     }
0085
0086     if (mipc_check_address(hdr->mem2_boundary)) {
0087         printf("mini: invalid mem2_boundary %08X\n",
0088                hdr->mem2_boundary);
0089         error = -EINVAL;
0090         goto out;
0091     }
0092     *mem2_boundary = hdr->mem2_boundary;
0093     error = 0;
0094 out:
0095     return error;
0096
0097 }
0098
0099 static void platform_fixups(void)
0100 {
0101     void *mem;
0102     u32 reg[4];
0103     u32 mem2_boundary;
0104     int len;
0105     int error;
0106
0107     mem = finddevice("/memory");
0108     if (!mem)
0109         fatal("Can't find memory node\n");
0110
0111     /* two ranges of (address, size) words */
0112     len = getprop(mem, "reg", reg, sizeof(reg));
0113     if (len != sizeof(reg)) {
0114         /* nothing to do */
0115         goto out;
0116     }
0117
0118     /* retrieve MEM2 boundary from 'mini' */
0119     error = mipc_get_mem2_boundary(&mem2_boundary);
0120     if (error) {
0121         /* if that fails use a sane value */
0122         mem2_boundary = MEM2_TOP - FIRMWARE_DEFAULT_SIZE;
0123     }
0124
0125     if (mem2_boundary > reg[2] && mem2_boundary < reg[2] + reg[3]) {
0126         reg[3] = mem2_boundary - reg[2];
0127         printf("top of MEM2 @ %08X\n", reg[2] + reg[3]);
0128         setprop(mem, "reg", reg, sizeof(reg));
0129     }
0130
0131 out:
0132     return;
0133 }
0134
0135 void platform_init(unsigned long r3, unsigned long r4, unsigned long r5)
0136 {
0137     u32 heapsize = 24*1024*1024 - (u32)_end;
0138
0139     simple_alloc_init(_end, heapsize, 32, 64);
0140     fdt_init(_dtb_start);
0141
0142     /*
0143      * 'mini' boots the Broadway processor with EXI disabled.
0144      * We need it enabled before probing for the USB Gecko.
0145      */
0146     out_be32(EXI_CTRL, in_be32(EXI_CTRL) | EXI_CTRL_ENABLE);
0147
0148     if (ug_probe())
0149         console_ops.write = ug_console_write;
0150
0151     platform_ops.fixups = platform_fixups;
0152 }
0153