arch/mips/lantiq/setup.c

   1 /*
   2  *  This program is free software; you can redistribute it and/or modify it
   3  *  under the terms of the GNU General Public License version 2 as published
   4  *  by the Free Software Foundation.
   5  *
   6  * Copyright (C) 2010 John Crispin <blogic@openwrt.org>
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/export.h>
  11 #include <linux/io.h>
  12 #include <linux/ioport.h>
  13 #include <asm/bootinfo.h>
  14
  15 #include <lantiq_soc.h>
  16
  17 #include "prom.h"
  18
  19 void __init plat_mem_setup(void)
  20 {
  21         /* assume 16M as default incase uboot fails to pass proper ramsize */
  22         unsigned long memsize = 16;
  23         char **envp = (char **) KSEG1ADDR(fw_arg2);
  24
  25         ioport_resource.start = IOPORT_RESOURCE_START;
  26         ioport_resource.end = IOPORT_RESOURCE_END;
  27         iomem_resource.start = IOMEM_RESOURCE_START;
  28         iomem_resource.end = IOMEM_RESOURCE_END;
  29
  30         set_io_port_base((unsigned long) KSEG1);
  31
  32         while (*envp) {
  33                 char *e = (char *)KSEG1ADDR(*envp);
  34                 if (!strncmp(e, "memsize=", 8)) {
  35                         e += 8;
  36                         if (strict_strtoul(e, 0, &memsize))
  37                                 pr_warn("bad memsize specified\n");
  38                 }
  39                 envp++;
  40         }
  41         memsize *= 1024 * 1024;
  42         add_memory_region(0x00000000, memsize, BOOT_MEM_RAM);
  43 }