/* *  linux/arch/arm/kernel/devtree.c * *  Copyright (C) 2009 Canonical Ltd. <jeremy.kerr@canonical.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include <linux/init.h>#include <linux/module.h>#include <linux/errno.h>#include <linux/types.h>#include <linux/bootmem.h>#include <linux/memblock.h>#include <linux/of.h>#include <linux/of_fdt.h>#include <linux/of_irq.h>#include <linux/of_platform.h> #include <asm/setup.h>#include <asm/page.h>#include <asm/mach/arch.h>#include <asm/mach-types.h> void __init early_init_dt_add_memory_arch(u64 base, u64 size){	arm_add_memory(base, size);} void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align){	return alloc_bootmem_align(size, align);} void __init arm_dt_memblock_reserve(void){	u64 *reserve_map, base, size; 	if (!initial_boot_params)		return; 	/* Reserve the dtb region */	memblock_reserve(virt_to_phys(initial_boot_params),			 be32_to_cpu(initial_boot_params->totalsize)); 	/*	 * Process the reserve map.  This will probably overlap the initrd	 * and dtb locations which are already reserved, but overlaping	 * doesn't hurt anything	 */	reserve_map = ((void*)initial_boot_params) +			be32_to_cpu(initial_boot_params->off_mem_rsvmap);	while (1) {		base = be64_to_cpup(reserve_map++);		size = be64_to_cpup(reserve_map++);		if (!size)			break;		memblock_reserve(base, size);	}} /** * setup_machine_fdt - Machine setup when an dtb was passed to the kernel * @dt_phys: physical address of dt blob * * If a dtb was passed to the kernel in r2, then use it to choose the * correct machine_desc and to setup the system. */struct machine_desc * __init setup_machine_fdt(unsigned int dt_phys){	struct boot_param_header *devtree;	struct machine_desc *mdesc, *mdesc_best = NULL;	unsigned int score, mdesc_score = ~1;	unsigned long dt_root;	const char *model; 	if (!dt_phys)		return NULL; 	devtree = phys_to_virt(dt_phys); 	/* check device tree validity */	if (be32_to_cpu(devtree->magic) != OF_DT_HEADER)		return NULL; 	/* Search the mdescs for the 'best' compatible value match */	initial_boot_params = devtree;	dt_root = of_get_flat_dt_root();	for_each_machine_desc(mdesc) {		score = of_flat_dt_match(dt_root, mdesc->dt_compat);		if (score > 0 && score < mdesc_score) {			mdesc_best = mdesc;			mdesc_score = score;		}	}	if (!mdesc_best) {		const char *prop;		long size; 		early_print("\nError: unrecognized/unsupported "			    "device tree compatible list:\n[ "); 		prop = of_get_flat_dt_prop(dt_root, "compatible", &size);		while (size > 0) {			early_print("'%s' ", prop);			size -= strlen(prop) + 1;			prop += strlen(prop) + 1;		}		early_print("]\n\n"); 		dump_machine_table(); /* does not return */	} 	model = of_get_flat_dt_prop(dt_root, "model", NULL);	if (!model)		model = of_get_flat_dt_prop(dt_root, "compatible", NULL);	if (!model)		model = "<unknown>";	pr_info("Machine: %s, model: %s\n", mdesc_best->name, model); 	/* Retrieve various information from the /chosen node */	of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line);	/* Initialize {size,address}-cells info */	of_scan_flat_dt(early_init_dt_scan_root, NULL);	/* Setup memory, calling early_init_dt_add_memory_arch */	of_scan_flat_dt(early_init_dt_scan_memory, NULL); 	/* Change machine number to match the mdesc we're using */	__machine_arch_type = mdesc_best->nr; 	return mdesc_best;}