arch/mips/ath79/prom.c

   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 }