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 static const void * __init arch_get_next_mach(const char *const **match) 21 { 22 static const struct machine_desc *mdesc = __arch_info_begin; 23 const struct machine_desc *m = mdesc; 24 25 if (m >= __arch_info_end) 26 return NULL; 27 28 mdesc++; 29 *match = m->dt_compat; 30 return m; 31 } 32 33 /** 34 * setup_machine_fdt - Machine setup when an dtb was passed to the kernel 35 * @dt: virtual address pointer to dt blob 36 * 37 * If a dtb was passed to the kernel, then use it to choose the correct 38 * machine_desc and to setup the system. 39 */ 40 const struct machine_desc * __init setup_machine_fdt(void *dt) 41 { 42 const struct machine_desc *mdesc; 43 unsigned long dt_root; 44 const void *clk; 45 int len; 46 47 if (!early_init_dt_scan(dt)) 48 return NULL; 49 50 mdesc = of_flat_dt_match_machine(NULL, arch_get_next_mach); 51 if (!mdesc) 52 machine_halt(); 53 54 dt_root = of_get_flat_dt_root(); 55 clk = of_get_flat_dt_prop(dt_root, "clock-frequency", &len); 56 if (clk) 57 arc_set_core_freq(of_read_ulong(clk, len/4)); 58 59 return mdesc; 60 } 61