2 * linux/arch/metag/kernel/devtree.c
4 * Copyright (C) 2012 Imagination Technologies Ltd.
6 * Based on ARM version:
7 * Copyright (C) 2009 Canonical Ltd. <jeremy.kerr@canonical.com>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation.
14 #include <linux/init.h>
15 #include <linux/export.h>
16 #include <linux/types.h>
17 #include <linux/bootmem.h>
18 #include <linux/memblock.h>
20 #include <linux/of_fdt.h>
22 #include <asm/setup.h>
24 #include <asm/mach/arch.h>
26 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
28 pr_err("%s(%llx, %llx)\n",
29 __func__, base, size);
32 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
34 return alloc_bootmem_align(size, align);
38 * setup_machine_fdt - Machine setup when an dtb was passed to the kernel
39 * @dt: virtual address pointer to dt blob
41 * If a dtb was passed to the kernel, then use it to choose the correct
42 * machine_desc and to setup the system.
44 struct machine_desc * __init setup_machine_fdt(void *dt)
46 struct boot_param_header *devtree = dt;
47 struct machine_desc *mdesc, *mdesc_best = NULL;
48 unsigned int score, mdesc_score = ~1;
49 unsigned long dt_root;
52 /* check device tree validity */
53 if (be32_to_cpu(devtree->magic) != OF_DT_HEADER)
56 /* Search the mdescs for the 'best' compatible value match */
57 initial_boot_params = devtree;
58 dt_root = of_get_flat_dt_root();
60 for_each_machine_desc(mdesc) {
61 score = of_flat_dt_match(dt_root, mdesc->dt_compat);
62 if (score > 0 && score < mdesc_score) {
71 pr_err("\nError: unrecognized/unsupported device tree compatible list:\n[ ");
73 prop = of_get_flat_dt_prop(dt_root, "compatible", &size);
76 printk("'%s' ", prop);
77 size -= strlen(prop) + 1;
78 prop += strlen(prop) + 1;
83 dump_machine_table(); /* does not return */
86 model = of_get_flat_dt_prop(dt_root, "model", NULL);
88 model = of_get_flat_dt_prop(dt_root, "compatible", NULL);
91 pr_info("Machine: %s, model: %s\n", mdesc_best->name, model);
93 /* Retrieve various information from the /chosen node */
94 of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line);