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4f246ba3 JB |
1 | /* |
2 | * OpenRISC prom.c | |
3 | * | |
4 | * Linux architectural port borrowing liberally from similar works of | |
5 | * others. All original copyrights apply as per the original source | |
6 | * declaration. | |
7 | * | |
8 | * Modifications for the OpenRISC architecture: | |
9 | * Copyright (C) 2010-2011 Jonas Bonn <jonas@southpole.se> | |
10 | * | |
11 | * This program is free software; you can redistribute it and/or | |
12 | * modify it under the terms of the GNU General Public License | |
13 | * as published by the Free Software Foundation; either version | |
14 | * 2 of the License, or (at your option) any later version. | |
15 | * | |
16 | * Architecture specific procedures for creating, accessing and | |
17 | * interpreting the device tree. | |
18 | * | |
19 | */ | |
20 | ||
21 | #include <stdarg.h> | |
22 | #include <linux/kernel.h> | |
23 | #include <linux/string.h> | |
24 | #include <linux/init.h> | |
25 | #include <linux/threads.h> | |
26 | #include <linux/spinlock.h> | |
27 | #include <linux/types.h> | |
28 | #include <linux/pci.h> | |
29 | #include <linux/stringify.h> | |
30 | #include <linux/delay.h> | |
31 | #include <linux/initrd.h> | |
32 | #include <linux/bitops.h> | |
33 | #include <linux/module.h> | |
34 | #include <linux/kexec.h> | |
35 | #include <linux/debugfs.h> | |
36 | #include <linux/irq.h> | |
37 | #include <linux/memblock.h> | |
38 | #include <linux/of_fdt.h> | |
39 | ||
40 | #include <asm/prom.h> | |
41 | #include <asm/page.h> | |
42 | #include <asm/processor.h> | |
43 | #include <asm/irq.h> | |
44 | #include <linux/io.h> | |
4f246ba3 JB |
45 | #include <asm/mmu.h> |
46 | #include <asm/pgtable.h> | |
47 | #include <asm/sections.h> | |
48 | #include <asm/setup.h> | |
49 | ||
50 | extern char cmd_line[COMMAND_LINE_SIZE]; | |
51 | ||
52 | void __init early_init_dt_add_memory_arch(u64 base, u64 size) | |
53 | { | |
54 | size &= PAGE_MASK; | |
55 | memblock_add(base, size); | |
56 | } | |
57 | ||
4f246ba3 JB |
58 | void __init early_init_devtree(void *params) |
59 | { | |
60 | void *alloc; | |
61 | ||
62 | /* Setup flat device-tree pointer */ | |
63 | initial_boot_params = params; | |
64 | ||
65 | ||
66 | /* Retrieve various informations from the /chosen node of the | |
67 | * device-tree, including the platform type, initrd location and | |
68 | * size, TCE reserve, and more ... | |
69 | */ | |
70 | of_scan_flat_dt(early_init_dt_scan_chosen, cmd_line); | |
71 | ||
72 | /* Scan memory nodes and rebuild MEMBLOCKs */ | |
4f246ba3 JB |
73 | of_scan_flat_dt(early_init_dt_scan_root, NULL); |
74 | of_scan_flat_dt(early_init_dt_scan_memory, NULL); | |
75 | ||
76 | /* Save command line for /proc/cmdline and then parse parameters */ | |
77 | strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE); | |
78 | ||
1aadc056 | 79 | memblock_allow_resize(); |
4f246ba3 JB |
80 | |
81 | /* We must copy the flattend device tree from init memory to regular | |
82 | * memory because the device tree references the strings in it | |
83 | * directly. | |
84 | */ | |
85 | ||
86 | alloc = __va(memblock_alloc(initial_boot_params->totalsize, PAGE_SIZE)); | |
87 | ||
88 | memcpy(alloc, initial_boot_params, initial_boot_params->totalsize); | |
89 | ||
90 | initial_boot_params = alloc; | |
91 | } | |
92 | ||
93 | #ifdef CONFIG_BLK_DEV_INITRD | |
374d5c99 | 94 | void __init early_init_dt_setup_initrd_arch(u64 start, u64 end) |
4f246ba3 JB |
95 | { |
96 | initrd_start = (unsigned long)__va(start); | |
97 | initrd_end = (unsigned long)__va(end); | |
98 | initrd_below_start_ok = 1; | |
99 | } | |
100 | #endif |