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 19 /* called from unflatten_device_tree() to bootstrap devicetree itself */ 20 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align) 21 { 22 return __va(memblock_alloc(size, align)); 23 } 24 25 /** 26 * setup_machine_fdt - Machine setup when an dtb was passed to the kernel 27 * @dt: virtual address pointer to dt blob 28 * 29 * If a dtb was passed to the kernel, then use it to choose the correct 30 * machine_desc and to setup the system. 31 */ 32 int __init setup_machine_fdt(void *dt) 33 { 34 struct boot_param_header *devtree = dt; 35 unsigned long dt_root; 36 char *model, *compat; 37 char manufacturer[16]; 38 39 /* check device tree validity */ 40 if (be32_to_cpu(devtree->magic) != OF_DT_HEADER) 41 return 1; 42 43 /* Search the mdescs for the 'best' compatible value match */ 44 initial_boot_params = devtree; 45 dt_root = of_get_flat_dt_root(); 46 47 /* compat = "<manufacturer>,<model>" */ 48 compat = of_get_flat_dt_prop(dt_root, "compatible", NULL); 49 if (!compat) 50 compat = "<unknown>"; 51 52 model = strchr(compat, ','); 53 if (model) 54 model++; 55 56 strlcpy(manufacturer, compat, model ? model - compat : strlen(compat)); 57 58 pr_info("Board \"%s\" from %s (Manufacturer)\n", model, manufacturer); 59 60 /* Retrieve various information from the /chosen node */ 61 of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line); 62 63 return 0; 64 } 65