91 lines
2.8 KiB
C
91 lines
2.8 KiB
C
/*
|
|
* The simple platform -- for booting when firmware doesn't supply a device
|
|
* tree or any platform configuration information.
|
|
* All data is extracted from an embedded device tree
|
|
* blob.
|
|
*
|
|
* Authors: Scott Wood <scottwood@freescale.com>
|
|
* Grant Likely <grant.likely@secretlab.ca>
|
|
*
|
|
* Copyright (c) 2007 Freescale Semiconductor, Inc.
|
|
* Copyright (c) 2008 Secret Lab Technologies Ltd.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 as published
|
|
* by the Free Software Foundation.
|
|
*/
|
|
|
|
#include "ops.h"
|
|
#include "types.h"
|
|
#include "io.h"
|
|
#include "stdio.h"
|
|
#include <libfdt.h>
|
|
|
|
BSS_STACK(4*1024);
|
|
|
|
extern int platform_specific_init(void) __attribute__((weak));
|
|
|
|
void platform_init(unsigned long r3, unsigned long r4, unsigned long r5,
|
|
unsigned long r6, unsigned long r7)
|
|
{
|
|
const u32 *na, *ns, *reg, *timebase;
|
|
u64 memsize64;
|
|
int node, size, i;
|
|
|
|
/* Make sure FDT blob is sane */
|
|
if (fdt_check_header(_dtb_start) != 0)
|
|
fatal("Invalid device tree blob\n");
|
|
|
|
/* Find the #address-cells and #size-cells properties */
|
|
node = fdt_path_offset(_dtb_start, "/");
|
|
if (node < 0)
|
|
fatal("Cannot find root node\n");
|
|
na = fdt_getprop(_dtb_start, node, "#address-cells", &size);
|
|
if (!na || (size != 4))
|
|
fatal("Cannot find #address-cells property");
|
|
ns = fdt_getprop(_dtb_start, node, "#size-cells", &size);
|
|
if (!ns || (size != 4))
|
|
fatal("Cannot find #size-cells property");
|
|
|
|
/* Find the memory range */
|
|
node = fdt_node_offset_by_prop_value(_dtb_start, -1, "device_type",
|
|
"memory", sizeof("memory"));
|
|
if (node < 0)
|
|
fatal("Cannot find memory node\n");
|
|
reg = fdt_getprop(_dtb_start, node, "reg", &size);
|
|
if (size < (*na+*ns) * sizeof(u32))
|
|
fatal("cannot get memory range\n");
|
|
|
|
/* Only interested in memory based at 0 */
|
|
for (i = 0; i < *na; i++)
|
|
if (*reg++ != 0)
|
|
fatal("Memory range is not based at address 0\n");
|
|
|
|
/* get the memsize and trucate it to under 4G on 32 bit machines */
|
|
memsize64 = 0;
|
|
for (i = 0; i < *ns; i++)
|
|
memsize64 = (memsize64 << 32) | *reg++;
|
|
if (sizeof(void *) == 4 && memsize64 >= 0x100000000ULL)
|
|
memsize64 = 0xffffffff;
|
|
|
|
/* finally, setup the timebase */
|
|
node = fdt_node_offset_by_prop_value(_dtb_start, -1, "device_type",
|
|
"cpu", sizeof("cpu"));
|
|
if (!node)
|
|
fatal("Cannot find cpu node\n");
|
|
timebase = fdt_getprop(_dtb_start, node, "timebase-frequency", &size);
|
|
if (timebase && (size == 4))
|
|
timebase_period_ns = 1000000000 / *timebase;
|
|
|
|
/* Now we have the memory size; initialize the heap */
|
|
simple_alloc_init(_end, memsize64 - (unsigned long)_end, 32, 64);
|
|
|
|
/* prepare the device tree and find the console */
|
|
fdt_init(_dtb_start);
|
|
|
|
if (platform_specific_init)
|
|
platform_specific_init();
|
|
|
|
serial_console_init();
|
|
}
|