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