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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
d2477b5c GL |
2 | /* |
3 | * The simple platform -- for booting when firmware doesn't supply a device | |
4 | * tree or any platform configuration information. | |
5 | * All data is extracted from an embedded device tree | |
6 | * blob. | |
7 | * | |
8 | * Authors: Scott Wood <scottwood@freescale.com> | |
9 | * Grant Likely <grant.likely@secretlab.ca> | |
10 | * | |
11 | * Copyright (c) 2007 Freescale Semiconductor, Inc. | |
12 | * Copyright (c) 2008 Secret Lab Technologies Ltd. | |
d2477b5c GL |
13 | */ |
14 | ||
15 | #include "ops.h" | |
16 | #include "types.h" | |
17 | #include "io.h" | |
18 | #include "stdio.h" | |
9fffb55f | 19 | #include <libfdt.h> |
d2477b5c GL |
20 | |
21 | BSS_STACK(4*1024); | |
22 | ||
d58577d8 JL |
23 | extern int platform_specific_init(void) __attribute__((weak)); |
24 | ||
d2477b5c GL |
25 | void platform_init(unsigned long r3, unsigned long r4, unsigned long r5, |
26 | unsigned long r6, unsigned long r7) | |
27 | { | |
28 | const u32 *na, *ns, *reg, *timebase; | |
29 | u64 memsize64; | |
30 | int node, size, i; | |
31 | ||
32 | /* Make sure FDT blob is sane */ | |
33 | if (fdt_check_header(_dtb_start) != 0) | |
34 | fatal("Invalid device tree blob\n"); | |
35 | ||
36 | /* Find the #address-cells and #size-cells properties */ | |
37 | node = fdt_path_offset(_dtb_start, "/"); | |
38 | if (node < 0) | |
39 | fatal("Cannot find root node\n"); | |
40 | na = fdt_getprop(_dtb_start, node, "#address-cells", &size); | |
41 | if (!na || (size != 4)) | |
42 | fatal("Cannot find #address-cells property"); | |
43 | ns = fdt_getprop(_dtb_start, node, "#size-cells", &size); | |
44 | if (!ns || (size != 4)) | |
45 | fatal("Cannot find #size-cells property"); | |
46 | ||
47 | /* Find the memory range */ | |
48 | node = fdt_node_offset_by_prop_value(_dtb_start, -1, "device_type", | |
49 | "memory", sizeof("memory")); | |
50 | if (node < 0) | |
51 | fatal("Cannot find memory node\n"); | |
52 | reg = fdt_getprop(_dtb_start, node, "reg", &size); | |
53 | if (size < (*na+*ns) * sizeof(u32)) | |
54 | fatal("cannot get memory range\n"); | |
55 | ||
56 | /* Only interested in memory based at 0 */ | |
57 | for (i = 0; i < *na; i++) | |
58 | if (*reg++ != 0) | |
59 | fatal("Memory range is not based at address 0\n"); | |
60 | ||
c614f13a | 61 | /* get the memsize and truncate it to under 4G on 32 bit machines */ |
d2477b5c GL |
62 | memsize64 = 0; |
63 | for (i = 0; i < *ns; i++) | |
64 | memsize64 = (memsize64 << 32) | *reg++; | |
65 | if (sizeof(void *) == 4 && memsize64 >= 0x100000000ULL) | |
66 | memsize64 = 0xffffffff; | |
67 | ||
68 | /* finally, setup the timebase */ | |
69 | node = fdt_node_offset_by_prop_value(_dtb_start, -1, "device_type", | |
70 | "cpu", sizeof("cpu")); | |
71 | if (!node) | |
72 | fatal("Cannot find cpu node\n"); | |
73 | timebase = fdt_getprop(_dtb_start, node, "timebase-frequency", &size); | |
74 | if (timebase && (size == 4)) | |
75 | timebase_period_ns = 1000000000 / *timebase; | |
76 | ||
77 | /* Now we have the memory size; initialize the heap */ | |
78 | simple_alloc_init(_end, memsize64 - (unsigned long)_end, 32, 64); | |
79 | ||
80 | /* prepare the device tree and find the console */ | |
81 | fdt_init(_dtb_start); | |
d58577d8 JL |
82 | |
83 | if (platform_specific_init) | |
84 | platform_specific_init(); | |
85 | ||
d2477b5c GL |
86 | serial_console_init(); |
87 | } |