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/prom.h> 18 #include <asm/clk.h> 19 #include <asm/mach_desc.h> 20 21 static const void * __init arch_get_next_mach(const char *const **match) 22 { 23 static const struct machine_desc *mdesc = __arch_info_begin; 24 const struct machine_desc *m = mdesc; 25 26 if (m >= __arch_info_end) 27 return NULL; 28 29 mdesc++; 30 *match = m->dt_compat; 31 return m; 32 } 33 34 /** 35 * setup_machine_fdt - Machine setup when an dtb was passed to the kernel 36 * @dt: virtual address pointer to dt blob 37 * 38 * If a dtb was passed to the kernel, then use it to choose the correct 39 * machine_desc and to setup the system. 40 */ 41 const struct machine_desc * __init setup_machine_fdt(void *dt) 42 { 43 const struct machine_desc *mdesc; 44 unsigned long dt_root; 45 void *clk; 46 unsigned long len; 47 48 if (!early_init_dt_scan(dt)) 49 return NULL; 50 51 mdesc = of_flat_dt_match_machine(NULL, arch_get_next_mach); 52 if (!mdesc) 53 machine_halt(); 54 55 dt_root = of_get_flat_dt_root(); 56 clk = of_get_flat_dt_prop(dt_root, "clock-frequency", &len); 57 if (clk) 58 arc_set_core_freq(of_read_ulong(clk, len/4)); 59 60 return mdesc; 61 } 62