xref: /linux/arch/mips/ath79/prom.c (revision d4a67d9dc8a5a80c4ec1814791af8c0252c158b8)
1*d4a67d9dSGabor Juhos /*
2*d4a67d9dSGabor Juhos  *  Atheros AR71XX/AR724X/AR913X specific prom routines
3*d4a67d9dSGabor Juhos  *
4*d4a67d9dSGabor Juhos  *  Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
5*d4a67d9dSGabor Juhos  *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
6*d4a67d9dSGabor Juhos  *
7*d4a67d9dSGabor Juhos  *  This program is free software; you can redistribute it and/or modify it
8*d4a67d9dSGabor Juhos  *  under the terms of the GNU General Public License version 2 as published
9*d4a67d9dSGabor Juhos  *  by the Free Software Foundation.
10*d4a67d9dSGabor Juhos  */
11*d4a67d9dSGabor Juhos 
12*d4a67d9dSGabor Juhos #include <linux/kernel.h>
13*d4a67d9dSGabor Juhos #include <linux/init.h>
14*d4a67d9dSGabor Juhos #include <linux/io.h>
15*d4a67d9dSGabor Juhos #include <linux/string.h>
16*d4a67d9dSGabor Juhos 
17*d4a67d9dSGabor Juhos #include <asm/bootinfo.h>
18*d4a67d9dSGabor Juhos #include <asm/addrspace.h>
19*d4a67d9dSGabor Juhos 
20*d4a67d9dSGabor Juhos #include "common.h"
21*d4a67d9dSGabor Juhos 
22*d4a67d9dSGabor Juhos static inline int is_valid_ram_addr(void *addr)
23*d4a67d9dSGabor Juhos {
24*d4a67d9dSGabor Juhos 	if (((u32) addr > KSEG0) &&
25*d4a67d9dSGabor Juhos 	    ((u32) addr < (KSEG0 + ATH79_MEM_SIZE_MAX)))
26*d4a67d9dSGabor Juhos 		return 1;
27*d4a67d9dSGabor Juhos 
28*d4a67d9dSGabor Juhos 	if (((u32) addr > KSEG1) &&
29*d4a67d9dSGabor Juhos 	    ((u32) addr < (KSEG1 + ATH79_MEM_SIZE_MAX)))
30*d4a67d9dSGabor Juhos 		return 1;
31*d4a67d9dSGabor Juhos 
32*d4a67d9dSGabor Juhos 	return 0;
33*d4a67d9dSGabor Juhos }
34*d4a67d9dSGabor Juhos 
35*d4a67d9dSGabor Juhos static __init void ath79_prom_init_cmdline(int argc, char **argv)
36*d4a67d9dSGabor Juhos {
37*d4a67d9dSGabor Juhos 	int i;
38*d4a67d9dSGabor Juhos 
39*d4a67d9dSGabor Juhos 	if (!is_valid_ram_addr(argv))
40*d4a67d9dSGabor Juhos 		return;
41*d4a67d9dSGabor Juhos 
42*d4a67d9dSGabor Juhos 	for (i = 0; i < argc; i++)
43*d4a67d9dSGabor Juhos 		if (is_valid_ram_addr(argv[i])) {
44*d4a67d9dSGabor Juhos 			strlcat(arcs_cmdline, " ", sizeof(arcs_cmdline));
45*d4a67d9dSGabor Juhos 			strlcat(arcs_cmdline, argv[i], sizeof(arcs_cmdline));
46*d4a67d9dSGabor Juhos 		}
47*d4a67d9dSGabor Juhos }
48*d4a67d9dSGabor Juhos 
49*d4a67d9dSGabor Juhos void __init prom_init(void)
50*d4a67d9dSGabor Juhos {
51*d4a67d9dSGabor Juhos 	ath79_prom_init_cmdline(fw_arg0, (char **)fw_arg1);
52*d4a67d9dSGabor Juhos }
53*d4a67d9dSGabor Juhos 
54*d4a67d9dSGabor Juhos void __init prom_free_prom_memory(void)
55*d4a67d9dSGabor Juhos {
56*d4a67d9dSGabor Juhos 	/* We do not have to prom memory to free */
57*d4a67d9dSGabor Juhos }
58