projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | ||
| 64 | /* get the memsize and trucate it to under 4G on 32 bit machines */ | |
| 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 | } |