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>
45 #include <asm/system.h>
46 #include <asm/mmu.h>
47 #include <asm/pgtable.h>
48 #include <asm/sections.h>
49 #include <asm/setup.h>
50
51 extern char cmd_line[COMMAND_LINE_SIZE];
52
early_init_dt_add_memory_arch(u64 base,u64 size)53 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
54 {
55 size &= PAGE_MASK;
56 memblock_add(base, size);
57 }
58
early_init_dt_alloc_memory_arch(u64 size,u64 align)59 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
60 {
61 return __va(memblock_alloc(size, align));
62 }
63
early_init_devtree(void * params)64 void __init early_init_devtree(void *params)
65 {
66 void *alloc;
67
68 /* Setup flat device-tree pointer */
69 initial_boot_params = params;
70
71
72 /* Retrieve various informations from the /chosen node of the
73 * device-tree, including the platform type, initrd location and
74 * size, TCE reserve, and more ...
75 */
76 of_scan_flat_dt(early_init_dt_scan_chosen, cmd_line);
77
78 /* Scan memory nodes and rebuild MEMBLOCKs */
79 of_scan_flat_dt(early_init_dt_scan_root, NULL);
80 of_scan_flat_dt(early_init_dt_scan_memory, NULL);
81
82 /* Save command line for /proc/cmdline and then parse parameters */
83 strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);
84
85 memblock_allow_resize();
86
87 /* We must copy the flattend device tree from init memory to regular
88 * memory because the device tree references the strings in it
89 * directly.
90 */
91
92 alloc = __va(memblock_alloc(initial_boot_params->totalsize, PAGE_SIZE));
93
94 memcpy(alloc, initial_boot_params, initial_boot_params->totalsize);
95
96 initial_boot_params = alloc;
97 }
98
99 #ifdef CONFIG_BLK_DEV_INITRD
early_init_dt_setup_initrd_arch(unsigned long start,unsigned long end)100 void __init early_init_dt_setup_initrd_arch(unsigned long start,
101 unsigned long end)
102 {
103 initrd_start = (unsigned long)__va(start);
104 initrd_end = (unsigned long)__va(end);
105 initrd_below_start_ok = 1;
106 }
107 #endif
108