1/*
 2 * Copyright (C) 2012 Synopsys, Inc. (www.synopsys.com)
 3 *
 4 * Based on reduced version of METAG
 5 *
 6 * This program is free software; you can redistribute it and/or modify
 7 * it under the terms of the GNU General Public License version 2 as
 8 * published by the Free Software Foundation.
 9 */
10
11
12#include <linux/init.h>
13#include <linux/reboot.h>
14#include <linux/memblock.h>
15#include <linux/of.h>
16#include <linux/of_fdt.h>
17#include <asm/clk.h>
18#include <asm/mach_desc.h>
19
20static const void * __init arch_get_next_mach(const char *const **match)
21{
22	static const struct machine_desc *mdesc = __arch_info_begin;
23	const struct machine_desc *m = mdesc;
24
25	if (m >= __arch_info_end)
26		return NULL;
27
28	mdesc++;
29	*match = m->dt_compat;
30	return m;
31}
32
33/**
34 * setup_machine_fdt - Machine setup when an dtb was passed to the kernel
35 * @dt:		virtual address pointer to dt blob
36 *
37 * If a dtb was passed to the kernel, then use it to choose the correct
38 * machine_desc and to setup the system.
39 */
40const struct machine_desc * __init setup_machine_fdt(void *dt)
41{
42	const struct machine_desc *mdesc;
43	unsigned long dt_root;
44	void *clk;
45	unsigned long len;
46
47	if (!early_init_dt_scan(dt))
48		return NULL;
49
50	mdesc = of_flat_dt_match_machine(NULL, arch_get_next_mach);
51	if (!mdesc)
52		machine_halt();
53
54	dt_root = of_get_flat_dt_root();
55	clk = of_get_flat_dt_prop(dt_root, "clock-frequency", &len);
56	if (clk)
57		arc_set_core_freq(of_read_ulong(clk, len/4));
58
59	return mdesc;
60}