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
20#ifdef CONFIG_SERIAL_EARLYCON
21
22static unsigned int __initdata arc_base_baud;
23
24unsigned int __init arc_early_base_baud(void)
25{
26	return arc_base_baud/16;
27}
28
29static void __init arc_set_early_base_baud(unsigned long dt_root)
30{
31	unsigned int core_clk = arc_get_core_freq();
32
33	if (of_flat_dt_is_compatible(dt_root, "abilis,arc-tb10x"))
34		arc_base_baud = core_clk/3;
35	else
36		arc_base_baud = core_clk;
37}
38#else
39#define arc_set_early_base_baud(dt_root)
40#endif
41
42static const void * __init arch_get_next_mach(const char *const **match)
43{
44	static const struct machine_desc *mdesc = __arch_info_begin;
45	const struct machine_desc *m = mdesc;
46
47	if (m >= __arch_info_end)
48		return NULL;
49
50	mdesc++;
51	*match = m->dt_compat;
52	return m;
53}
54
55/**
56 * setup_machine_fdt - Machine setup when an dtb was passed to the kernel
57 * @dt:		virtual address pointer to dt blob
58 *
59 * If a dtb was passed to the kernel, then use it to choose the correct
60 * machine_desc and to setup the system.
61 */
62const struct machine_desc * __init setup_machine_fdt(void *dt)
63{
64	const struct machine_desc *mdesc;
65	unsigned long dt_root;
66	const void *clk;
67	int len;
68
69	if (!early_init_dt_scan(dt))
70		return NULL;
71
72	mdesc = of_flat_dt_match_machine(NULL, arch_get_next_mach);
73	if (!mdesc)
74		machine_halt();
75
76	dt_root = of_get_flat_dt_root();
77	clk = of_get_flat_dt_prop(dt_root, "clock-frequency", &len);
78	if (clk)
79		arc_set_core_freq(of_read_ulong(clk, len/4));
80
81	arc_set_early_base_baud(dt_root);
82
83	return mdesc;
84}
85