1/*
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
4 * for more details.
5 *
6 * Copyright (C) 2012 MIPS Technologies, Inc.  All rights reserved.
7 * Copyright (C) 2013 Imagination Technologies Ltd.
8 */
9#include <linux/init.h>
10#include <linux/libfdt.h>
11#include <linux/of_platform.h>
12#include <linux/of_fdt.h>
13
14#include <asm/prom.h>
15#include <asm/fw/fw.h>
16
17#include <asm/mips-boards/generic.h>
18
19const char *get_system_type(void)
20{
21	return "MIPS SEAD3";
22}
23
24static uint32_t get_memsize_from_cmdline(void)
25{
26	int memsize = 0;
27	char *p = arcs_cmdline;
28	char *s = "memsize=";
29
30	p = strstr(p, s);
31	if (p) {
32		p += strlen(s);
33		memsize = memparse(p, NULL);
34	}
35
36	return memsize;
37}
38
39static uint32_t get_memsize_from_env(void)
40{
41	int memsize = 0;
42	char *p;
43
44	p = fw_getenv("memsize");
45	if (p)
46		memsize = memparse(p, NULL);
47
48	return memsize;
49}
50
51static uint32_t get_memsize(void)
52{
53	uint32_t memsize;
54
55	memsize = get_memsize_from_cmdline();
56	if (memsize)
57		return memsize;
58
59	return get_memsize_from_env();
60}
61
62static void __init parse_memsize_param(void)
63{
64	int offset;
65	const uint64_t *prop_value;
66	int prop_len;
67	uint32_t memsize = get_memsize();
68
69	if (!memsize)
70		return;
71
72	offset = fdt_path_offset(__dtb_start, "/memory");
73	if (offset > 0) {
74		uint64_t new_value;
75		/*
76		 * reg contains 2 32-bits BE values, offset and size. We just
77		 * want to replace the size value without affecting the offset
78		 */
79		prop_value = fdt_getprop(__dtb_start, offset, "reg", &prop_len);
80		new_value = be64_to_cpu(*prop_value);
81		new_value =  (new_value & ~0xffffffffllu) | memsize;
82		fdt_setprop_inplace_u64(__dtb_start, offset, "reg", new_value);
83	}
84}
85
86void __init plat_mem_setup(void)
87{
88	/* allow command line/bootloader env to override memory size in DT */
89	parse_memsize_param();
90
91	/*
92	 * Load the builtin devicetree. This causes the chosen node to be
93	 * parsed resulting in our memory appearing
94	 */
95	__dt_setup_arch(__dtb_start);
96}
97
98void __init device_tree_init(void)
99{
100	if (!initial_boot_params)
101		return;
102
103	unflatten_and_copy_device_tree();
104}
105
106static int __init customize_machine(void)
107{
108	of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
109	return 0;
110}
111arch_initcall(customize_machine);
112