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/mach_desc.h>
18
19#ifdef CONFIG_SERIAL_EARLYCON
20
21static unsigned int __initdata arc_base_baud;
22
23unsigned int __init arc_early_base_baud(void)
24{
25	return arc_base_baud/16;
26}
27
28static void __init arc_set_early_base_baud(unsigned long dt_root)
29{
30	if (of_flat_dt_is_compatible(dt_root, "abilis,arc-tb10x"))
31		arc_base_baud = 166666666;	/* Fixed 166.6MHz clk (TB10x) */
32	else if (of_flat_dt_is_compatible(dt_root, "snps,arc-sdp"))
33		arc_base_baud = 33333333;	/* Fixed 33MHz clk (AXS10x) */
34	else if (of_flat_dt_is_compatible(dt_root, "ezchip,arc-nps"))
35		arc_base_baud = 800000000;      /* Fixed 800MHz clk (NPS) */
36	else
37		arc_base_baud = 50000000;	/* Fixed default 50MHz */
38}
39#else
40#define arc_set_early_base_baud(dt_root)
41#endif
42
43static const void * __init arch_get_next_mach(const char *const **match)
44{
45	static const struct machine_desc *mdesc = __arch_info_begin;
46	const struct machine_desc *m = mdesc;
47
48	if (m >= __arch_info_end)
49		return NULL;
50
51	mdesc++;
52	*match = m->dt_compat;
53	return m;
54}
55
56/**
57 * setup_machine_fdt - Machine setup when an dtb was passed to the kernel
58 * @dt:		virtual address pointer to dt blob
59 *
60 * If a dtb was passed to the kernel, then use it to choose the correct
61 * machine_desc and to setup the system.
62 */
63const struct machine_desc * __init setup_machine_fdt(void *dt)
64{
65	const struct machine_desc *mdesc;
66	unsigned long dt_root;
67
68	if (!early_init_dt_scan(dt))
69		return NULL;
70
71	mdesc = of_flat_dt_match_machine(NULL, arch_get_next_mach);
72	if (!mdesc)
73		machine_halt();
74
75	dt_root = of_get_flat_dt_root();
76	arc_set_early_base_baud(dt_root);
77
78	return mdesc;
79}