1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2012 Synopsys, Inc. (www.synopsys.com)
5 * Based on reduced version of METAG
9 #include <linux/init.h>
10 #include <linux/reboot.h>
11 #include <linux/memblock.h>
13 #include <linux/of_fdt.h>
14 #include <asm/mach_desc.h>
16 #ifdef CONFIG_SERIAL_EARLYCON
18 static unsigned int __initdata arc_base_baud;
20 unsigned int __init arc_early_base_baud(void)
22 return arc_base_baud/16;
25 static void __init arc_set_early_base_baud(unsigned long dt_root)
27 if (of_flat_dt_is_compatible(dt_root, "abilis,arc-tb10x"))
28 arc_base_baud = 166666666; /* Fixed 166.6MHz clk (TB10x) */
29 else if (of_flat_dt_is_compatible(dt_root, "snps,arc-sdp") ||
30 of_flat_dt_is_compatible(dt_root, "snps,hsdk"))
31 arc_base_baud = 33333333; /* Fixed 33MHz clk (AXS10x & HSDK) */
33 arc_base_baud = 50000000; /* Fixed default 50MHz */
36 #define arc_set_early_base_baud(dt_root)
39 static const void * __init arch_get_next_mach(const char *const **match)
41 static const struct machine_desc *mdesc = __arch_info_begin;
42 const struct machine_desc *m = mdesc;
44 if (m >= __arch_info_end)
48 *match = m->dt_compat;
53 * setup_machine_fdt - Machine setup when an dtb was passed to the kernel
54 * @dt: virtual address pointer to dt blob
56 * If a dtb was passed to the kernel, then use it to choose the correct
57 * machine_desc and to setup the system.
59 const struct machine_desc * __init setup_machine_fdt(void *dt)
61 const struct machine_desc *mdesc;
62 unsigned long dt_root;
64 if (!early_init_dt_scan(dt))
67 mdesc = of_flat_dt_match_machine(NULL, arch_get_next_mach);
71 dt_root = of_get_flat_dt_root();
72 arc_set_early_base_baud(dt_root);