2 * Copyright (C) 2012 Synopsys, Inc. (www.synopsys.com)
4 * Based on reduced version of METAG
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.
12 #include <linux/init.h>
13 #include <linux/reboot.h>
14 #include <linux/memblock.h>
16 #include <linux/of_fdt.h>
19 #include <asm/mach_desc.h>
21 /* called from unflatten_device_tree() to bootstrap devicetree itself */
22 void * __init
early_init_dt_alloc_memory_arch(u64 size
, u64 align
)
24 return __va(memblock_alloc(size
, align
));
28 * setup_machine_fdt - Machine setup when an dtb was passed to the kernel
29 * @dt: virtual address pointer to dt blob
31 * If a dtb was passed to the kernel, then use it to choose the correct
32 * machine_desc and to setup the system.
34 struct machine_desc
* __init
setup_machine_fdt(void *dt
)
36 struct boot_param_header
*devtree
= dt
;
37 struct machine_desc
*mdesc
= NULL
, *mdesc_best
= NULL
;
38 unsigned int score
, mdesc_score
= ~1;
39 unsigned long dt_root
;
40 const char *model
, *compat
;
42 char manufacturer
[16];
45 /* check device tree validity */
46 if (be32_to_cpu(devtree
->magic
) != OF_DT_HEADER
)
49 initial_boot_params
= devtree
;
50 dt_root
= of_get_flat_dt_root();
53 * The kernel could be multi-platform enabled, thus could have many
54 * "baked-in" machine descriptors. Search thru all for the best
55 * "compatible" string match.
57 for_each_machine_desc(mdesc
) {
58 score
= of_flat_dt_match(dt_root
, mdesc
->dt_compat
);
59 if (score
> 0 && score
< mdesc_score
) {
68 pr_err("\n unrecognized device tree list:\n[ ");
70 prop
= of_get_flat_dt_prop(dt_root
, "compatible", &size
);
73 printk("'%s' ", prop
);
74 size
-= strlen(prop
) + 1;
75 prop
+= strlen(prop
) + 1;
83 /* compat = "<manufacturer>,<model>" */
84 compat
= mdesc_best
->dt_compat
[0];
86 model
= strchr(compat
, ',');
90 strlcpy(manufacturer
, compat
, model
? model
- compat
: strlen(compat
));
92 pr_info("Board \"%s\" from %s (Manufacturer)\n", model
, manufacturer
);
94 /* Retrieve various information from the /chosen node */
95 of_scan_flat_dt(early_init_dt_scan_chosen
, boot_command_line
);
97 /* Initialize {size,address}-cells info */
98 of_scan_flat_dt(early_init_dt_scan_root
, NULL
);
100 /* Setup memory, calling early_init_dt_add_memory_arch */
101 of_scan_flat_dt(early_init_dt_scan_memory
, NULL
);
103 clk
= of_get_flat_dt_prop(dt_root
, "clock-frequency", &len
);
105 arc_set_core_freq(of_read_ulong(clk
, len
/4));
111 * Copy the flattened DT out of .init since unflattening doesn't copy strings
112 * and the normal DT APIs refs them from orig flat DT
114 void __init
copy_devtree(void)
116 void *alloc
= early_init_dt_alloc_memory_arch(
117 be32_to_cpu(initial_boot_params
->totalsize
), 64);
119 memcpy(alloc
, initial_boot_params
,
120 be32_to_cpu(initial_boot_params
->totalsize
));
121 initial_boot_params
= alloc
;