xref: /linux/arch/powerpc/boot/wii.c (revision 75bf465f0bc33e9b776a46d6a1b9b990f5fb7c37)
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 
mipc_check_address(u32 pa)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 
mipc_get_infohdr(void)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((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 
71 out:
72 	return hdr;
73 }
74 
mipc_get_mem2_boundary(u32 * mem2_boundary)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(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;
94 out:
95 	return error;
96 
97 }
98 
platform_fixups(void)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("/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 
131 out:
132 	return;
133 }
134 
platform_init(unsigned long r3,unsigned long r4,unsigned long r5)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(_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