2 * Copyright (C) 2012 Synopsys, Inc. (www.synopsys.com)
4 * Based on reduced version of METAG
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.
12 #include <linux/init.h>
13 #include <linux/reboot.h>
14 #include <linux/memblock.h>
16 #include <linux/of_fdt.h>
17 #include <asm/mach_desc.h>
19 #ifdef CONFIG_SERIAL_EARLYCON
21 static unsigned int __initdata arc_base_baud;
23 unsigned int __init arc_early_base_baud(void)
25 return arc_base_baud/16;
28 static void __init arc_set_early_base_baud(unsigned long dt_root)
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) */
37 arc_base_baud = 50000000; /* Fixed default 50MHz */
40 #define arc_set_early_base_baud(dt_root)
43 static const void * __init arch_get_next_mach(const char *const **match)
45 static const struct machine_desc *mdesc = __arch_info_begin;
46 const struct machine_desc *m = mdesc;
48 if (m >= __arch_info_end)
52 *match = m->dt_compat;
57 * setup_machine_fdt - Machine setup when an dtb was passed to the kernel
58 * @dt: virtual address pointer to dt blob
60 * If a dtb was passed to the kernel, then use it to choose the correct
61 * machine_desc and to setup the system.
63 const struct machine_desc * __init setup_machine_fdt(void *dt)
65 const struct machine_desc *mdesc;
66 unsigned long dt_root;
68 if (!early_init_dt_scan(dt))
71 mdesc = of_flat_dt_match_machine(NULL, arch_get_next_mach);
75 dt_root = of_get_flat_dt_root();
76 arc_set_early_base_baud(dt_root);