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
get_system_type(void)19 const char *get_system_type(void)
20 {
21 return "MIPS SEAD3";
22 }
23
get_memsize_from_cmdline(void)24 static 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
get_memsize_from_env(void)39 static 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
get_memsize(void)51 static 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
parse_memsize_param(void)62 static 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
plat_mem_setup(void)86 void __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
device_tree_init(void)98 void __init device_tree_init(void)
99 {
100 if (!initial_boot_params)
101 return;
102
103 unflatten_and_copy_device_tree();
104 }
105
customize_machine(void)106 static int __init customize_machine(void)
107 {
108 of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
109 return 0;
110 }
111 arch_initcall(customize_machine);
112