xref: /linux/arch/mips/kernel/prom.c (revision e0bf6c5ca2d3281f231c5f0c9bf145e9513644de)
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/debugfs.h>
17 #include <linux/of.h>
18 #include <linux/of_fdt.h>
19 #include <linux/of_platform.h>
20 
21 #include <asm/page.h>
22 #include <asm/prom.h>
23 
24 static char mips_machine_name[64] = "Unknown";
25 
26 __init void mips_set_machine_name(const char *name)
27 {
28 	if (name == NULL)
29 		return;
30 
31 	strlcpy(mips_machine_name, name, sizeof(mips_machine_name));
32 	pr_info("MIPS: machine is %s\n", mips_get_machine_name());
33 }
34 
35 char *mips_get_machine_name(void)
36 {
37 	return mips_machine_name;
38 }
39 
40 #ifdef CONFIG_OF
41 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
42 {
43 	return add_memory_region(base, size, BOOT_MEM_RAM);
44 }
45 
46 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
47 {
48 	return __alloc_bootmem(size, align, __pa(MAX_DMA_ADDRESS));
49 }
50 
51 void __init __dt_setup_arch(void *bph)
52 {
53 	if (!early_init_dt_scan(bph))
54 		return;
55 
56 	mips_set_machine_name(of_flat_dt_get_machine_name());
57 }
58 
59 int __init __dt_register_buses(const char *bus0, const char *bus1)
60 {
61 	static struct of_device_id of_ids[3];
62 
63 	if (!of_have_populated_dt())
64 		panic("device tree not present");
65 
66 	strlcpy(of_ids[0].compatible, bus0, sizeof(of_ids[0].compatible));
67 	strlcpy(of_ids[1].compatible, bus1, sizeof(of_ids[1].compatible));
68 
69 	if (of_platform_populate(NULL, of_ids, NULL, NULL))
70 		panic("failed to populate DT");
71 
72 	return 0;
73 }
74 
75 #endif
76