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
early_init_dt_scan_memory_arch(unsigned long node,const char * uname,int depth,void * data)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
early_init_dt_add_memory_arch(u64 base,u64 size)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
reserve_mem_mach(unsigned long addr,unsigned long size)38 int __init reserve_mem_mach(unsigned long addr, unsigned long size)
39 {
40 return reserve_bootmem(addr, size, BOOTMEM_DEFAULT);
41 }
42
free_mem_mach(unsigned long addr,unsigned long size)43 void __init free_mem_mach(unsigned long addr, unsigned long size)
44 {
45 return free_bootmem(addr, size);
46 }
47
early_init_dt_alloc_memory_arch(u64 size,u64 align)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
early_init_dt_setup_initrd_arch(unsigned long start,unsigned long end)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
early_init_devtree(void * params)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
device_tree_init(void)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