Commit | Line | Data |
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d2477b5c GL |
1 | /* |
2 | * The simple platform -- for booting when firmware doesn't supply a device | |
3 | * tree or any platform configuration information. | |
4 | * All data is extracted from an embedded device tree | |
5 | * blob. | |
6 | * | |
7 | * Authors: Scott Wood <scottwood@freescale.com> | |
8 | * Grant Likely <grant.likely@secretlab.ca> | |
9 | * | |
10 | * Copyright (c) 2007 Freescale Semiconductor, Inc. | |
11 | * Copyright (c) 2008 Secret Lab Technologies Ltd. | |
12 | * | |
13 | * This program is free software; you can redistribute it and/or modify it | |
14 | * under the terms of the GNU General Public License version 2 as published | |
15 | * by the Free Software Foundation. | |
16 | */ | |
17 | ||
18 | #include "ops.h" | |
19 | #include "types.h" | |
20 | #include "io.h" | |
21 | #include "stdio.h" | |
9fffb55f | 22 | #include <libfdt.h> |
d2477b5c GL |
23 | |
24 | BSS_STACK(4*1024); | |
25 | ||
d58577d8 JL |
26 | extern int platform_specific_init(void) __attribute__((weak)); |
27 | ||
d2477b5c GL |
28 | void platform_init(unsigned long r3, unsigned long r4, unsigned long r5, |
29 | unsigned long r6, unsigned long r7) | |
30 | { | |
31 | const u32 *na, *ns, *reg, *timebase; | |
32 | u64 memsize64; | |
33 | int node, size, i; | |
34 | ||
35 | /* Make sure FDT blob is sane */ | |
36 | if (fdt_check_header(_dtb_start) != 0) | |
37 | fatal("Invalid device tree blob\n"); | |
38 | ||
39 | /* Find the #address-cells and #size-cells properties */ | |
40 | node = fdt_path_offset(_dtb_start, "/"); | |
41 | if (node < 0) | |
42 | fatal("Cannot find root node\n"); | |
43 | na = fdt_getprop(_dtb_start, node, "#address-cells", &size); | |
44 | if (!na || (size != 4)) | |
45 | fatal("Cannot find #address-cells property"); | |
46 | ns = fdt_getprop(_dtb_start, node, "#size-cells", &size); | |
47 | if (!ns || (size != 4)) | |
48 | fatal("Cannot find #size-cells property"); | |
49 | ||
50 | /* Find the memory range */ | |
51 | node = fdt_node_offset_by_prop_value(_dtb_start, -1, "device_type", | |
52 | "memory", sizeof("memory")); | |
53 | if (node < 0) | |
54 | fatal("Cannot find memory node\n"); | |
55 | reg = fdt_getprop(_dtb_start, node, "reg", &size); | |
56 | if (size < (*na+*ns) * sizeof(u32)) | |
57 | fatal("cannot get memory range\n"); | |
58 | ||
59 | /* Only interested in memory based at 0 */ | |
60 | for (i = 0; i < *na; i++) | |
61 | if (*reg++ != 0) | |
62 | fatal("Memory range is not based at address 0\n"); | |
63 | ||
c614f13a | 64 | /* get the memsize and truncate it to under 4G on 32 bit machines */ |
d2477b5c GL |
65 | memsize64 = 0; |
66 | for (i = 0; i < *ns; i++) | |
67 | memsize64 = (memsize64 << 32) | *reg++; | |
68 | if (sizeof(void *) == 4 && memsize64 >= 0x100000000ULL) | |
69 | memsize64 = 0xffffffff; | |
70 | ||
71 | /* finally, setup the timebase */ | |
72 | node = fdt_node_offset_by_prop_value(_dtb_start, -1, "device_type", | |
73 | "cpu", sizeof("cpu")); | |
74 | if (!node) | |
75 | fatal("Cannot find cpu node\n"); | |
76 | timebase = fdt_getprop(_dtb_start, node, "timebase-frequency", &size); | |
77 | if (timebase && (size == 4)) | |
78 | timebase_period_ns = 1000000000 / *timebase; | |
79 | ||
80 | /* Now we have the memory size; initialize the heap */ | |
81 | simple_alloc_init(_end, memsize64 - (unsigned long)_end, 32, 64); | |
82 | ||
83 | /* prepare the device tree and find the console */ | |
84 | fdt_init(_dtb_start); | |
d58577d8 JL |
85 | |
86 | if (platform_specific_init) | |
87 | platform_specific_init(); | |
88 | ||
d2477b5c GL |
89 | serial_console_init(); |
90 | } |