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[karo-tx-linux.git] / arch / mips / kernel / prom.c
1 /*
2  * MIPS support for CONFIG_OF device tree support
3  *
4  * Copyright (C) 2010 Cisco Systems Inc. <dediao@cisco.com>
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 #include <linux/init.h>
12 #include <linux/export.h>
13 #include <linux/errno.h>
14 #include <linux/types.h>
15 #include <linux/bootmem.h>
16 #include <linux/initrd.h>
17 #include <linux/debugfs.h>
18 #include <linux/of.h>
19 #include <linux/of_fdt.h>
20 #include <linux/of_irq.h>
21 #include <linux/of_platform.h>
22
23 #include <asm/page.h>
24 #include <asm/prom.h>
25
26 static char mips_machine_name[64] = "Unknown";
27
28 __init void mips_set_machine_name(const char *name)
29 {
30         if (name == NULL)
31                 return;
32
33         strlcpy(mips_machine_name, name, sizeof(mips_machine_name));
34         pr_info("MIPS: machine is %s\n", mips_get_machine_name());
35 }
36
37 char *mips_get_machine_name(void)
38 {
39         return mips_machine_name;
40 }
41
42 #ifdef CONFIG_OF
43 int __init early_init_dt_scan_memory_arch(unsigned long node,
44                                           const char *uname, int depth,
45                                           void *data)
46 {
47         return early_init_dt_scan_memory(node, uname, depth, data);
48 }
49
50 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
51 {
52         return add_memory_region(base, size, BOOT_MEM_RAM);
53 }
54
55 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
56 {
57         return __alloc_bootmem(size, align, __pa(MAX_DMA_ADDRESS));
58 }
59
60 #ifdef CONFIG_BLK_DEV_INITRD
61 void __init early_init_dt_setup_initrd_arch(u64 start, u64 end)
62 {
63         initrd_start = (unsigned long)__va(start);
64         initrd_end = (unsigned long)__va(end);
65         initrd_below_start_ok = 1;
66 }
67 #endif
68
69 int __init early_init_dt_scan_model(unsigned long node, const char *uname,
70                                     int depth, void *data)
71 {
72         if (!depth) {
73                 char *model = of_get_flat_dt_prop(node, "model", NULL);
74
75                 if (model)
76                         mips_set_machine_name(model);
77         }
78         return 0;
79 }
80
81 void __init early_init_devtree(void *params)
82 {
83         /* Setup flat device-tree pointer */
84         initial_boot_params = params;
85
86         /* Retrieve various informations from the /chosen node of the
87          * device-tree, including the platform type, initrd location and
88          * size, and more ...
89          */
90         of_scan_flat_dt(early_init_dt_scan_chosen, arcs_cmdline);
91
92
93         /* Scan memory nodes */
94         of_scan_flat_dt(early_init_dt_scan_root, NULL);
95         of_scan_flat_dt(early_init_dt_scan_memory_arch, NULL);
96
97         /* try to load the mips machine name */
98         of_scan_flat_dt(early_init_dt_scan_model, NULL);
99 }
100
101 void __init __dt_setup_arch(struct boot_param_header *bph)
102 {
103         if (be32_to_cpu(bph->magic) != OF_DT_HEADER) {
104                 pr_err("DTB has bad magic, ignoring builtin OF DTB\n");
105
106                 return;
107         }
108
109         initial_boot_params = bph;
110
111         early_init_devtree(initial_boot_params);
112 }
113 #endif