Don't crash on IOMMU overflow in A100U2W driver
[pandora-kernel.git] / arch / mips / fw / arc / identify.c
1 /*
2  * This file is subject to the terms and conditions of the GNU General Public
3  * License.  See the file "COPYING" in the main directory of this archive
4  * for more details.
5  *
6  * identify.c: identify machine by looking up system identifier
7  *
8  * Copyright (C) 1998 Thomas Bogendoerfer
9  *
10  * This code is based on arch/mips/sgi/kernel/system.c, which is
11  *
12  * Copyright (C) 1996 David S. Miller (dm@engr.sgi.com)
13  */
14 #include <linux/init.h>
15 #include <linux/kernel.h>
16 #include <linux/types.h>
17 #include <linux/string.h>
18
19 #include <asm/sgialib.h>
20 #include <asm/bootinfo.h>
21
22 struct smatch {
23         char *arcname;
24         char *liname;
25         int type;
26         int flags;
27 };
28
29 static struct smatch mach_table[] = {
30         {
31                 .arcname        = "SGI-IP22",
32                 .liname         = "SGI Indy",
33                 .type           = MACH_SGI_IP22,
34                 .flags          = PROM_FLAG_ARCS,
35         }, {
36                 .arcname        = "SGI-IP27",
37                 .liname         = "SGI Origin",
38                 .type           = MACH_SGI_IP27,
39                 .flags          = PROM_FLAG_ARCS,
40         }, {
41                 .arcname        = "SGI-IP28",
42                 .liname         = "SGI IP28",
43                 .type           = MACH_SGI_IP28,
44                 .flags          = PROM_FLAG_ARCS,
45         }, {
46                 .arcname        = "SGI-IP30",
47                 .liname         = "SGI Octane",
48                 .type           = MACH_SGI_IP30,
49                 .flags          = PROM_FLAG_ARCS,
50         }, {
51                 .arcname        = "SGI-IP32",
52                 .liname         = "SGI O2",
53                 .type           = MACH_SGI_IP32,
54                 .flags          = PROM_FLAG_ARCS,
55         }, {
56                 .arcname        = "Microsoft-Jazz",
57                 .liname         = "Jazz MIPS_Magnum_4000",
58                 .type           = MACH_MIPS_MAGNUM_4000,
59                 .flags          = 0,
60         }, {
61                 .arcname        = "PICA-61",
62                 .liname         = "Jazz Acer_PICA_61",
63                 .type           = MACH_ACER_PICA_61,
64                 .flags          = 0,
65         }, {
66                 .arcname        = "RM200PCI",
67                 .liname         = "SNI RM200_PCI",
68                 .type           = MACH_SNI_RM200_PCI,
69                 .flags          = PROM_FLAG_DONT_FREE_TEMP,
70         }, {
71                 .arcname        = "RM200PCI-R5K",
72                 .liname         = "SNI RM200_PCI-R5K",
73                 .type           = MACH_SNI_RM200_PCI,
74                 .flags          = PROM_FLAG_DONT_FREE_TEMP,
75         }
76 };
77
78 int prom_flags;
79
80 static struct smatch * __init string_to_mach(const char *s)
81 {
82         int i;
83
84         for (i = 0; i < ARRAY_SIZE(mach_table); i++) {
85                 if (!strcmp(s, mach_table[i].arcname))
86                         return &mach_table[i];
87         }
88
89         panic("Yeee, could not determine architecture type <%s>", s);
90 }
91
92 char *system_type;
93
94 const char *get_system_type(void)
95 {
96         return system_type;
97 }
98
99 void __init prom_identify_arch(void)
100 {
101         pcomponent *p;
102         struct smatch *mach;
103         const char *iname;
104
105         /*
106          * The root component tells us what machine architecture we have here.
107          */
108         p = ArcGetChild(PROM_NULL_COMPONENT);
109         if (p == NULL) {
110 #ifdef CONFIG_SGI_IP27
111                 /* IP27 PROM misbehaves, seems to not implement ARC
112                    GetChild().  So we just assume it's an IP27.  */
113                 iname = "SGI-IP27";
114 #else
115                 iname = "Unknown";
116 #endif
117         } else
118                 iname = (char *) (long) p->iname;
119
120         printk("ARCH: %s\n", iname);
121         mach = string_to_mach(iname);
122         system_type = mach->liname;
123
124         mips_machtype = mach->type;
125         prom_flags = mach->flags;
126 }