2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
7 * Copyright (C) 2013 Imagination Technologies Ltd.
9 #include <linux/init.h>
10 #include <linux/libfdt.h>
11 #include <linux/of_fdt.h>
14 #include <asm/fw/fw.h>
16 #include <asm/mips-boards/generic.h>
18 const char *get_system_type(void)
23 static uint32_t get_memsize_from_cmdline(void)
26 char *p
= arcs_cmdline
;
32 memsize
= memparse(p
, NULL
);
38 static uint32_t get_memsize_from_env(void)
43 p
= fw_getenv("memsize");
45 memsize
= memparse(p
, NULL
);
50 static uint32_t get_memsize(void)
54 memsize
= get_memsize_from_cmdline();
58 return get_memsize_from_env();
61 static void __init
parse_memsize_param(void)
64 const uint64_t *prop_value
;
66 uint32_t memsize
= get_memsize();
71 offset
= fdt_path_offset(__dtb_start
, "/memory");
75 * reg contains 2 32-bits BE values, offset and size. We just
76 * want to replace the size value without affecting the offset
78 prop_value
= fdt_getprop(__dtb_start
, offset
, "reg", &prop_len
);
79 new_value
= be64_to_cpu(*prop_value
);
80 new_value
= (new_value
& ~0xffffffffllu
) | memsize
;
81 fdt_setprop_inplace_u64(__dtb_start
, offset
, "reg", new_value
);
85 void __init
*plat_get_fdt(void)
87 return (void *)__dtb_start
;
90 void __init
plat_mem_setup(void)
92 /* allow command line/bootloader env to override memory size in DT */
93 parse_memsize_param();
96 * Load the builtin devicetree. This causes the chosen node to be
97 * parsed resulting in our memory appearing
99 __dt_setup_arch(__dtb_start
);
102 void __init
device_tree_init(void)
104 if (!initial_boot_params
)
107 unflatten_and_copy_device_tree();
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