Merge remote-tracking branch 's5p/for-next'
[linux-2.6/next.git] / arch / arm / kernel / devtree.c
blob1a33e9d6bb1fbfb083b602e74f0a4b5f0da7cded
1 /*
2 * linux/arch/arm/kernel/devtree.c
4 * Copyright (C) 2009 Canonical Ltd. <jeremy.kerr@canonical.com>
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 */
11 #include <linux/init.h>
12 #include <linux/module.h>
13 #include <linux/errno.h>
14 #include <linux/types.h>
15 #include <linux/bootmem.h>
16 #include <linux/memblock.h>
17 #include <linux/of.h>
18 #include <linux/of_fdt.h>
19 #include <linux/of_irq.h>
20 #include <linux/of_platform.h>
22 #include <asm/setup.h>
23 #include <asm/page.h>
24 #include <asm/mach/arch.h>
25 #include <asm/mach-types.h>
27 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
29 arm_add_memory(base, size);
32 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
34 return alloc_bootmem_align(size, align);
37 void __init arm_dt_memblock_reserve(void)
39 u64 *reserve_map, base, size;
41 if (!initial_boot_params)
42 return;
44 /* Reserve the dtb region */
45 memblock_reserve(virt_to_phys(initial_boot_params),
46 be32_to_cpu(initial_boot_params->totalsize));
49 * Process the reserve map. This will probably overlap the initrd
50 * and dtb locations which are already reserved, but overlaping
51 * doesn't hurt anything
53 reserve_map = ((void*)initial_boot_params) +
54 be32_to_cpu(initial_boot_params->off_mem_rsvmap);
55 while (1) {
56 base = be64_to_cpup(reserve_map++);
57 size = be64_to_cpup(reserve_map++);
58 if (!size)
59 break;
60 memblock_reserve(base, size);
64 /**
65 * setup_machine_fdt - Machine setup when an dtb was passed to the kernel
66 * @dt_phys: physical address of dt blob
68 * If a dtb was passed to the kernel in r2, then use it to choose the
69 * correct machine_desc and to setup the system.
71 struct machine_desc * __init setup_machine_fdt(unsigned int dt_phys)
73 struct boot_param_header *devtree;
74 struct machine_desc *mdesc, *mdesc_best = NULL;
75 unsigned int score, mdesc_score = ~1;
76 unsigned long dt_root;
77 const char *model;
79 if (!dt_phys)
80 return NULL;
82 devtree = phys_to_virt(dt_phys);
84 /* check device tree validity */
85 if (be32_to_cpu(devtree->magic) != OF_DT_HEADER)
86 return NULL;
88 /* Search the mdescs for the 'best' compatible value match */
89 initial_boot_params = devtree;
90 dt_root = of_get_flat_dt_root();
91 for_each_machine_desc(mdesc) {
92 score = of_flat_dt_match(dt_root, mdesc->dt_compat);
93 if (score > 0 && score < mdesc_score) {
94 mdesc_best = mdesc;
95 mdesc_score = score;
98 if (!mdesc_best) {
99 const char *prop;
100 long size;
102 early_print("\nError: unrecognized/unsupported "
103 "device tree compatible list:\n[ ");
105 prop = of_get_flat_dt_prop(dt_root, "compatible", &size);
106 while (size > 0) {
107 early_print("'%s' ", prop);
108 size -= strlen(prop) + 1;
109 prop += strlen(prop) + 1;
111 early_print("]\n\n");
113 dump_machine_table(); /* does not return */
116 model = of_get_flat_dt_prop(dt_root, "model", NULL);
117 if (!model)
118 model = of_get_flat_dt_prop(dt_root, "compatible", NULL);
119 if (!model)
120 model = "<unknown>";
121 pr_info("Machine: %s, model: %s\n", mdesc_best->name, model);
123 /* Retrieve various information from the /chosen node */
124 of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line);
125 /* Initialize {size,address}-cells info */
126 of_scan_flat_dt(early_init_dt_scan_root, NULL);
127 /* Setup memory, calling early_init_dt_add_memory_arch */
128 of_scan_flat_dt(early_init_dt_scan_memory, NULL);
130 /* Change machine number to match the mdesc we're using */
131 __machine_arch_type = mdesc_best->nr;
133 return mdesc_best;