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/mach_desc.h> 18 19 #ifdef CONFIG_SERIAL_EARLYCON 20 21 static unsigned int __initdata arc_base_baud; 22 23 unsigned int __init arc_early_base_baud(void) 24 { 25 return arc_base_baud/16; 26 } 27 28 static void __init arc_set_early_base_baud(unsigned long dt_root) 29 { 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 of_flat_dt_is_compatible(dt_root, "snps,hsdk")) 34 arc_base_baud = 33333333; /* Fixed 33MHz clk (AXS10x & HSDK) */ 35 else if (of_flat_dt_is_compatible(dt_root, "ezchip,arc-nps")) 36 arc_base_baud = 800000000; /* Fixed 800MHz clk (NPS) */ 37 else 38 arc_base_baud = 50000000; /* Fixed default 50MHz */ 39 } 40 #else 41 #define arc_set_early_base_baud(dt_root) 42 #endif 43 44 static const void * __init arch_get_next_mach(const char *const **match) 45 { 46 static const struct machine_desc *mdesc = __arch_info_begin; 47 const struct machine_desc *m = mdesc; 48 49 if (m >= __arch_info_end) 50 return NULL; 51 52 mdesc++; 53 *match = m->dt_compat; 54 return m; 55 } 56 57 /** 58 * setup_machine_fdt - Machine setup when an dtb was passed to the kernel 59 * @dt: virtual address pointer to dt blob 60 * 61 * If a dtb was passed to the kernel, then use it to choose the correct 62 * machine_desc and to setup the system. 63 */ 64 const struct machine_desc * __init setup_machine_fdt(void *dt) 65 { 66 const struct machine_desc *mdesc; 67 unsigned long dt_root; 68 69 if (!early_init_dt_scan(dt)) 70 return NULL; 71 72 mdesc = of_flat_dt_match_machine(NULL, arch_get_next_mach); 73 if (!mdesc) 74 machine_halt(); 75 76 dt_root = of_get_flat_dt_root(); 77 arc_set_early_base_baud(dt_root); 78 79 return mdesc; 80 } 81