tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
26int __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
33void __init early_init_dt_add_memory_arch(u64 base, u64 size)
34{
35 return add_memory_region(base, size, BOOT_MEM_RAM);
36}
37
38void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
39{
40 return __alloc_bootmem(size, align, __pa(MAX_DMA_ADDRESS));
41}
42
43#ifdef CONFIG_BLK_DEV_INITRD
44void __init early_init_dt_setup_initrd_arch(unsigned long start,
45 unsigned long end)
46{
47 initrd_start = (unsigned long)__va(start);
48 initrd_end = (unsigned long)__va(end);
49 initrd_below_start_ok = 1;
50}
51#endif
52
53void __init early_init_devtree(void *params)
54{
55 /* Setup flat device-tree pointer */
56 initial_boot_params = params;
57
58 /* Retrieve various informations from the /chosen node of the
59 * device-tree, including the platform type, initrd location and
60 * size, and more ...
61 */
62 of_scan_flat_dt(early_init_dt_scan_chosen, arcs_cmdline);
63
64
65 /* Scan memory nodes */
66 of_scan_flat_dt(early_init_dt_scan_root, NULL);
67 of_scan_flat_dt(early_init_dt_scan_memory_arch, NULL);
68}
69
70void __init __dt_setup_arch(struct boot_param_header *bph)
71{
72 if (be32_to_cpu(bph->magic) != OF_DT_HEADER) {
73 pr_err("DTB has bad magic, ignoring builtin OF DTB\n");
74
75 return;
76 }
77
78 initial_boot_params = bph;
79
80 early_init_devtree(initial_boot_params);
81}