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87 lines
2.7 KiB
87 lines
2.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* The simple platform -- for booting when firmware doesn't supply a device |
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* tree or any platform configuration information. |
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* All data is extracted from an embedded device tree |
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* blob. |
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* |
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* Authors: Scott Wood <[email protected]> |
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* Grant Likely <[email protected]> |
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* |
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* Copyright (c) 2007 Freescale Semiconductor, Inc. |
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* Copyright (c) 2008 Secret Lab Technologies Ltd. |
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*/ |
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#include "ops.h" |
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#include "types.h" |
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#include "io.h" |
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#include "stdio.h" |
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#include <libfdt.h> |
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BSS_STACK(4*1024); |
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extern int platform_specific_init(void) __attribute__((weak)); |
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void platform_init(unsigned long r3, unsigned long r4, unsigned long r5, |
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unsigned long r6, unsigned long r7) |
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{ |
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const u32 *na, *ns, *reg, *timebase; |
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u64 memsize64; |
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int node, size, i; |
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/* Make sure FDT blob is sane */ |
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if (fdt_check_header(_dtb_start) != 0) |
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fatal("Invalid device tree blob\n"); |
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/* Find the #address-cells and #size-cells properties */ |
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node = fdt_path_offset(_dtb_start, "/"); |
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if (node < 0) |
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fatal("Cannot find root node\n"); |
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na = fdt_getprop(_dtb_start, node, "#address-cells", &size); |
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if (!na || (size != 4)) |
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fatal("Cannot find #address-cells property"); |
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ns = fdt_getprop(_dtb_start, node, "#size-cells", &size); |
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if (!ns || (size != 4)) |
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fatal("Cannot find #size-cells property"); |
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/* Find the memory range */ |
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node = fdt_node_offset_by_prop_value(_dtb_start, -1, "device_type", |
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"memory", sizeof("memory")); |
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if (node < 0) |
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fatal("Cannot find memory node\n"); |
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reg = fdt_getprop(_dtb_start, node, "reg", &size); |
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if (size < (*na+*ns) * sizeof(u32)) |
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fatal("cannot get memory range\n"); |
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/* Only interested in memory based at 0 */ |
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for (i = 0; i < *na; i++) |
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if (*reg++ != 0) |
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fatal("Memory range is not based at address 0\n"); |
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/* get the memsize and truncate it to under 4G on 32 bit machines */ |
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memsize64 = 0; |
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for (i = 0; i < *ns; i++) |
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memsize64 = (memsize64 << 32) | *reg++; |
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if (sizeof(void *) == 4 && memsize64 >= 0x100000000ULL) |
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memsize64 = 0xffffffff; |
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/* finally, setup the timebase */ |
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node = fdt_node_offset_by_prop_value(_dtb_start, -1, "device_type", |
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"cpu", sizeof("cpu")); |
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if (!node) |
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fatal("Cannot find cpu node\n"); |
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timebase = fdt_getprop(_dtb_start, node, "timebase-frequency", &size); |
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if (timebase && (size == 4)) |
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timebase_period_ns = 1000000000 / *timebase; |
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/* Now we have the memory size; initialize the heap */ |
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simple_alloc_init(_end, memsize64 - (unsigned long)_end, 32, 64); |
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/* prepare the device tree and find the console */ |
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fdt_init(_dtb_start); |
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if (platform_specific_init) |
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platform_specific_init(); |
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serial_console_init(); |
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}
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