arch/arm/mach-davinci/io.c

   1 /*
   2  * DaVinci I/O mapping code
   3  *
   4  * Copyright (C) 2005-2006 Texas Instruments
   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/module.h>
  12 #include <linux/kernel.h>
  13 #include <linux/init.h>
  14
  15 #include <asm/tlb.h>
  16 #include <asm/io.h>
  17 #include <asm/memory.h>
  18
  19 #include <asm/mach/map.h>
  20
  21 extern void davinci_check_revision(void);
  22
  23 /*
  24  * The machine specific code may provide the extra mapping besides the
  25  * default mapping provided here.
  26  */
  27 static struct map_desc davinci_io_desc[] __initdata = {
  28         {
  29                 .virtual        = IO_VIRT,
  30                 .pfn            = __phys_to_pfn(IO_PHYS),
  31                 .length         = IO_SIZE,
  32                 .type           = MT_DEVICE
  33         },
  34 };
  35
  36 void __init davinci_map_common_io(void)
  37 {
  38         iotable_init(davinci_io_desc, ARRAY_SIZE(davinci_io_desc));
  39
  40         /* Normally devicemaps_init() would flush caches and tlb after
  41          * mdesc->map_io(), but we must also do it here because of the CPU
  42          * revision check below.
  43          */
  44         local_flush_tlb_all();
  45         flush_cache_all();
  46
  47         /* We want to check CPU revision early for cpu_is_xxxx() macros.
  48          * IO space mapping must be initialized before we can do that.
  49          */
  50         davinci_check_revision();
  51 }