]>
Commit | Line | Data |
---|---|---|
999159a5 VG |
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> | |
450dd430 | 18 | #include <asm/clk.h> |
03a6d28c | 19 | #include <asm/mach_desc.h> |
999159a5 | 20 | |
999159a5 VG |
21 | /** |
22 | * setup_machine_fdt - Machine setup when an dtb was passed to the kernel | |
23 | * @dt: virtual address pointer to dt blob | |
24 | * | |
25 | * If a dtb was passed to the kernel, then use it to choose the correct | |
26 | * machine_desc and to setup the system. | |
27 | */ | |
03a6d28c | 28 | struct machine_desc * __init setup_machine_fdt(void *dt) |
999159a5 VG |
29 | { |
30 | struct boot_param_header *devtree = dt; | |
03a6d28c VG |
31 | struct machine_desc *mdesc = NULL, *mdesc_best = NULL; |
32 | unsigned int score, mdesc_score = ~1; | |
999159a5 | 33 | unsigned long dt_root; |
03a6d28c | 34 | const char *model, *compat; |
450dd430 | 35 | void *clk; |
999159a5 | 36 | char manufacturer[16]; |
450dd430 | 37 | unsigned long len; |
999159a5 VG |
38 | |
39 | /* check device tree validity */ | |
40 | if (be32_to_cpu(devtree->magic) != OF_DT_HEADER) | |
03a6d28c | 41 | return NULL; |
999159a5 | 42 | |
999159a5 VG |
43 | initial_boot_params = devtree; |
44 | dt_root = of_get_flat_dt_root(); | |
45 | ||
03a6d28c VG |
46 | /* |
47 | * The kernel could be multi-platform enabled, thus could have many | |
48 | * "baked-in" machine descriptors. Search thru all for the best | |
49 | * "compatible" string match. | |
50 | */ | |
51 | for_each_machine_desc(mdesc) { | |
52 | score = of_flat_dt_match(dt_root, mdesc->dt_compat); | |
53 | if (score > 0 && score < mdesc_score) { | |
54 | mdesc_best = mdesc; | |
55 | mdesc_score = score; | |
56 | } | |
57 | } | |
58 | if (!mdesc_best) { | |
59 | const char *prop; | |
60 | long size; | |
61 | ||
62 | pr_err("\n unrecognized device tree list:\n[ "); | |
63 | ||
64 | prop = of_get_flat_dt_prop(dt_root, "compatible", &size); | |
65 | if (prop) { | |
66 | while (size > 0) { | |
67 | printk("'%s' ", prop); | |
68 | size -= strlen(prop) + 1; | |
69 | prop += strlen(prop) + 1; | |
70 | } | |
71 | } | |
72 | printk("]\n\n"); | |
73 | ||
74 | machine_halt(); | |
75 | } | |
76 | ||
999159a5 | 77 | /* compat = "<manufacturer>,<model>" */ |
03a6d28c | 78 | compat = mdesc_best->dt_compat[0]; |
999159a5 VG |
79 | |
80 | model = strchr(compat, ','); | |
81 | if (model) | |
82 | model++; | |
83 | ||
84 | strlcpy(manufacturer, compat, model ? model - compat : strlen(compat)); | |
85 | ||
86 | pr_info("Board \"%s\" from %s (Manufacturer)\n", model, manufacturer); | |
87 | ||
88 | /* Retrieve various information from the /chosen node */ | |
89 | of_scan_flat_dt(early_init_dt_scan_chosen, boot_command_line); | |
90 | ||
450dd430 VG |
91 | /* Initialize {size,address}-cells info */ |
92 | of_scan_flat_dt(early_init_dt_scan_root, NULL); | |
93 | ||
94 | /* Setup memory, calling early_init_dt_add_memory_arch */ | |
95 | of_scan_flat_dt(early_init_dt_scan_memory, NULL); | |
96 | ||
97 | clk = of_get_flat_dt_prop(dt_root, "clock-frequency", &len); | |
98 | if (clk) | |
99 | arc_set_core_freq(of_read_ulong(clk, len/4)); | |
100 | ||
03a6d28c | 101 | return mdesc_best; |
999159a5 | 102 | } |
eab6a08c VG |
103 | |
104 | /* | |
105 | * Copy the flattened DT out of .init since unflattening doesn't copy strings | |
106 | * and the normal DT APIs refs them from orig flat DT | |
107 | */ | |
108 | void __init copy_devtree(void) | |
109 | { | |
110 | void *alloc = early_init_dt_alloc_memory_arch( | |
111 | be32_to_cpu(initial_boot_params->totalsize), 64); | |
112 | if (alloc) { | |
113 | memcpy(alloc, initial_boot_params, | |
114 | be32_to_cpu(initial_boot_params->totalsize)); | |
115 | initial_boot_params = alloc; | |
116 | } | |
117 | } |