117 lines
2.3 KiB
C
117 lines
2.3 KiB
C
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
|
|
* Copyright (C) 2013 Imagination Technologies Ltd.
|
|
*/
|
|
#include <linux/init.h>
|
|
#include <linux/libfdt.h>
|
|
#include <linux/of_platform.h>
|
|
#include <linux/of_fdt.h>
|
|
|
|
#include <asm/prom.h>
|
|
#include <asm/fw/fw.h>
|
|
|
|
#include <asm/mips-boards/generic.h>
|
|
|
|
const char *get_system_type(void)
|
|
{
|
|
return "MIPS SEAD3";
|
|
}
|
|
|
|
static uint32_t get_memsize_from_cmdline(void)
|
|
{
|
|
int memsize = 0;
|
|
char *p = arcs_cmdline;
|
|
char *s = "memsize=";
|
|
|
|
p = strstr(p, s);
|
|
if (p) {
|
|
p += strlen(s);
|
|
memsize = memparse(p, NULL);
|
|
}
|
|
|
|
return memsize;
|
|
}
|
|
|
|
static uint32_t get_memsize_from_env(void)
|
|
{
|
|
int memsize = 0;
|
|
char *p;
|
|
|
|
p = fw_getenv("memsize");
|
|
if (p)
|
|
memsize = memparse(p, NULL);
|
|
|
|
return memsize;
|
|
}
|
|
|
|
static uint32_t get_memsize(void)
|
|
{
|
|
uint32_t memsize;
|
|
|
|
memsize = get_memsize_from_cmdline();
|
|
if (memsize)
|
|
return memsize;
|
|
|
|
return get_memsize_from_env();
|
|
}
|
|
|
|
static void __init parse_memsize_param(void)
|
|
{
|
|
int offset;
|
|
const uint64_t *prop_value;
|
|
int prop_len;
|
|
uint32_t memsize = get_memsize();
|
|
|
|
if (!memsize)
|
|
return;
|
|
|
|
offset = fdt_path_offset(__dtb_start, "/memory");
|
|
if (offset > 0) {
|
|
uint64_t new_value;
|
|
/*
|
|
* reg contains 2 32-bits BE values, offset and size. We just
|
|
* want to replace the size value without affecting the offset
|
|
*/
|
|
prop_value = fdt_getprop(__dtb_start, offset, "reg", &prop_len);
|
|
new_value = be64_to_cpu(*prop_value);
|
|
new_value = (new_value & ~0xffffffffllu) | memsize;
|
|
fdt_setprop_inplace_u64(__dtb_start, offset, "reg", new_value);
|
|
}
|
|
}
|
|
|
|
void __init *plat_get_fdt(void)
|
|
{
|
|
return (void *)__dtb_start;
|
|
}
|
|
|
|
void __init plat_mem_setup(void)
|
|
{
|
|
/* allow command line/bootloader env to override memory size in DT */
|
|
parse_memsize_param();
|
|
|
|
/*
|
|
* Load the builtin devicetree. This causes the chosen node to be
|
|
* parsed resulting in our memory appearing
|
|
*/
|
|
__dt_setup_arch(__dtb_start);
|
|
}
|
|
|
|
void __init device_tree_init(void)
|
|
{
|
|
if (!initial_boot_params)
|
|
return;
|
|
|
|
unflatten_and_copy_device_tree();
|
|
}
|
|
|
|
static int __init customize_machine(void)
|
|
{
|
|
of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
|
|
return 0;
|
|
}
|
|
arch_initcall(customize_machine);
|