/* * Copyright (C) 2012 Synopsys, Inc. (www.synopsys.com) * * Based on reduced version of METAG * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */  #include <linux/init.h>#include <linux/reboot.h>#include <linux/memblock.h>#include <linux/of.h>#include <linux/of_fdt.h>#include <asm/clk.h>#include <asm/mach_desc.h> #ifdef CONFIG_SERIAL_EARLYCON static unsigned int __initdata arc_base_baud; unsigned int __init arc_early_base_baud(void){	return arc_base_baud/16;} static void __init arc_set_early_base_baud(unsigned long dt_root){	unsigned int core_clk = arc_get_core_freq(); 	if (of_flat_dt_is_compatible(dt_root, "abilis,arc-tb10x"))		arc_base_baud = core_clk/3;	else		arc_base_baud = core_clk;}#else#define arc_set_early_base_baud(dt_root)#endif static const void * __init arch_get_next_mach(const char *const **match){	static const struct machine_desc *mdesc = __arch_info_begin;	const struct machine_desc *m = mdesc; 	if (m >= __arch_info_end)		return NULL; 	mdesc++;	*match = m->dt_compat;	return m;} /** * setup_machine_fdt - Machine setup when an dtb was passed to the kernel * @dt:		virtual address pointer to dt blob * * If a dtb was passed to the kernel, then use it to choose the correct * machine_desc and to setup the system. */const struct machine_desc * __init setup_machine_fdt(void *dt){	const struct machine_desc *mdesc;	unsigned long dt_root;	const void *clk;	int len; 	if (!early_init_dt_scan(dt))		return NULL; 	mdesc = of_flat_dt_match_machine(NULL, arch_get_next_mach);	if (!mdesc)		machine_halt(); 	dt_root = of_get_flat_dt_root();	clk = of_get_flat_dt_prop(dt_root, "clock-frequency", &len);	if (clk)		arc_set_core_freq(of_read_ulong(clk, len/4)); 	arc_set_early_base_baud(dt_root); 	return mdesc;}