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);