xref: /openbmc/linux/arch/mips/ath79/prom.c (revision b34e08d5)
1 /*
2  *  Atheros AR71XX/AR724X/AR913X specific prom routines
3  *
4  *  Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
5  *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
6  *
7  *  This program is free software; you can redistribute it and/or modify it
8  *  under the terms of the GNU General Public License version 2 as published
9  *  by the Free Software Foundation.
10  */
11 
12 #include <linux/kernel.h>
13 #include <linux/init.h>
14 #include <linux/io.h>
15 #include <linux/string.h>
16 
17 #include <asm/bootinfo.h>
18 #include <asm/addrspace.h>
19 
20 #include "common.h"
21 
22 static inline int is_valid_ram_addr(void *addr)
23 {
24 	if (((u32) addr > KSEG0) &&
25 	    ((u32) addr < (KSEG0 + ATH79_MEM_SIZE_MAX)))
26 		return 1;
27 
28 	if (((u32) addr > KSEG1) &&
29 	    ((u32) addr < (KSEG1 + ATH79_MEM_SIZE_MAX)))
30 		return 1;
31 
32 	return 0;
33 }
34 
35 static __init void ath79_prom_init_cmdline(int argc, char **argv)
36 {
37 	int i;
38 
39 	if (!is_valid_ram_addr(argv))
40 		return;
41 
42 	for (i = 0; i < argc; i++)
43 		if (is_valid_ram_addr(argv[i])) {
44 			strlcat(arcs_cmdline, " ", sizeof(arcs_cmdline));
45 			strlcat(arcs_cmdline, argv[i], sizeof(arcs_cmdline));
46 		}
47 }
48 
49 void __init prom_init(void)
50 {
51 	ath79_prom_init_cmdline(fw_arg0, (char **)fw_arg1);
52 }
53 
54 void __init prom_free_prom_memory(void)
55 {
56 	/* We do not have to prom memory to free */
57 }
58