1 | // SPDX-License-Identifier: GPL-2.0-only |
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. |
13 | */ |
14 | |
15 | #include "ops.h" |
16 | #include "types.h" |
17 | #include "io.h" |
18 | #include "stdio.h" |
19 | #include <libfdt.h> |
20 | |
21 | BSS_STACK(4*1024); |
22 | |
23 | extern int platform_specific_init(void) __attribute__((weak)); |
24 | |
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 | |
61 | /* get the memsize and truncate it to under 4G on 32 bit machines */ |
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(base: _end, heap_size: memsize64 - (unsigned long)_end, granularity: 32, max_allocs: 64); |
79 | |
80 | /* prepare the device tree and find the console */ |
81 | fdt_init(blob: _dtb_start); |
82 | |
83 | if (platform_specific_init) |
84 | platform_specific_init(); |
85 | |
86 | serial_console_init(); |
87 | } |
88 | |