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 | |
18 | BSS_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 | |
29 | struct 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 | |
39 | static 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 | |
47 | static 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(pa: (u32)hdrp)) { |
54 | printf(fmt: "mini: invalid hdrp %08X\n" , (u32)hdrp); |
55 | hdr = NULL; |
56 | goto out; |
57 | } |
58 | |
59 | hdr = *hdrp; |
60 | if (mipc_check_address(pa: (u32)hdr)) { |
61 | printf(fmt: "mini: invalid hdr %08X\n" , (u32)hdr); |
62 | hdr = NULL; |
63 | goto out; |
64 | } |
65 | if (memcmp(hdr->magic, "IPC" , 3)) { |
66 | printf(fmt: "mini: invalid magic\n" ); |
67 | hdr = NULL; |
68 | goto out; |
69 | } |
70 | |
71 | out: |
72 | return hdr; |
73 | } |
74 | |
75 | static 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(pa: hdr->mem2_boundary)) { |
87 | printf(fmt: "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; |
94 | out: |
95 | return error; |
96 | |
97 | } |
98 | |
99 | static 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(name: "/memory" ); |
108 | if (!mem) |
109 | fatal("Can't find memory node\n" ); |
110 | |
111 | /* two ranges of (address, size) words */ |
112 | len = getprop(devp: mem, name: "reg" , buf: reg, buflen: 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: &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(fmt: "top of MEM2 @ %08X\n" , reg[2] + reg[3]); |
128 | setprop(devp: mem, name: "reg" , buf: reg, buflen: sizeof(reg)); |
129 | } |
130 | |
131 | out: |
132 | return; |
133 | } |
134 | |
135 | void 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(base: _end, heap_size: heapsize, granularity: 32, max_allocs: 64); |
140 | fdt_init(blob: _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, val: 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 | |