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