Merge branch 'for-3.5-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj...
[firefly-linux-kernel-4.4.55.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 int __init early_init_dt_scan_memory_arch(unsigned long node,
27                                           const char *uname, int depth,
28                                           void *data)
29 {
30         return early_init_dt_scan_memory(node, uname, depth, data);
31 }
32
33 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
34 {
35         return add_memory_region(base, size, BOOT_MEM_RAM);
36 }
37
38 int __init reserve_mem_mach(unsigned long addr, unsigned long size)
39 {
40         return reserve_bootmem(addr, size, BOOTMEM_DEFAULT);
41 }
42
43 void __init free_mem_mach(unsigned long addr, unsigned long size)
44 {
45         return free_bootmem(addr, size);
46 }
47
48 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
49 {
50         return __alloc_bootmem(size, align, __pa(MAX_DMA_ADDRESS));
51 }
52
53 #ifdef CONFIG_BLK_DEV_INITRD
54 void __init early_init_dt_setup_initrd_arch(unsigned long start,
55                                             unsigned long end)
56 {
57         initrd_start = (unsigned long)__va(start);
58         initrd_end = (unsigned long)__va(end);
59         initrd_below_start_ok = 1;
60 }
61 #endif
62
63 void __init early_init_devtree(void *params)
64 {
65         /* Setup flat device-tree pointer */
66         initial_boot_params = params;
67
68         /* Retrieve various informations from the /chosen node of the
69          * device-tree, including the platform type, initrd location and
70          * size, and more ...
71          */
72         of_scan_flat_dt(early_init_dt_scan_chosen, arcs_cmdline);
73
74
75         /* Scan memory nodes */
76         of_scan_flat_dt(early_init_dt_scan_root, NULL);
77         of_scan_flat_dt(early_init_dt_scan_memory_arch, NULL);
78 }
79
80 void __init device_tree_init(void)
81 {
82         unsigned long base, size;
83
84         if (!initial_boot_params)
85                 return;
86
87         base = virt_to_phys((void *)initial_boot_params);
88         size = be32_to_cpu(initial_boot_params->totalsize);
89
90         /* Before we do anything, lets reserve the dt blob */
91         reserve_mem_mach(base, size);
92
93         unflatten_device_tree();
94
95         /* free the space reserved for the dt blob */
96         free_mem_mach(base, size);
97 }
98
99 void __init __dt_setup_arch(struct boot_param_header *bph)
100 {
101         if (be32_to_cpu(bph->magic) != OF_DT_HEADER) {
102                 pr_err("DTB has bad magic, ignoring builtin OF DTB\n");
103
104                 return;
105         }
106
107         initial_boot_params = bph;
108
109         early_init_devtree(initial_boot_params);
110 }