release/src-rt-6.x.4708/linux/linux-2.6.36/arch/arm/mach-tegra/io.c

   1 /*
   2  * arch/arm/mach-tegra/io.c
   3  *
   4  * Copyright (C) 2010 Google, Inc.
   5  *
   6  * Author:
   7  *      Colin Cross <ccross@google.com>
   8  *      Erik Gilling <konkers@google.com>
   9  *
  10  * This software is licensed under the terms of the GNU General Public
  11  * License version 2, as published by the Free Software Foundation, and
  12  * may be copied, distributed, and modified under those terms.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  */
  20
  21 #include <linux/kernel.h>
  22 #include <linux/module.h>
  23 #include <linux/init.h>
  24 #include <linux/mm.h>
  25 #include <linux/io.h>
  26
  27 #include <mach/hardware.h>
  28 #include <asm/page.h>
  29 #include <asm/mach/map.h>
  30
  31 #include "board.h"
  32
  33 static struct map_desc tegra_io_desc[] __initdata = {
  34         {
  35                 .virtual = IO_PPSB_VIRT,
  36                 .pfn = __phys_to_pfn(IO_PPSB_PHYS),
  37                 .length = IO_PPSB_SIZE,
  38                 .type = MT_DEVICE,
  39         },
  40         {
  41                 .virtual = IO_APB_VIRT,
  42                 .pfn = __phys_to_pfn(IO_APB_PHYS),
  43                 .length = IO_APB_SIZE,
  44                 .type = MT_DEVICE,
  45         },
  46         {
  47                 .virtual = IO_CPU_VIRT,
  48                 .pfn = __phys_to_pfn(IO_CPU_PHYS),
  49                 .length = IO_CPU_SIZE,
  50                 .type = MT_DEVICE,
  51         },
  52 };
  53
  54 void __init tegra_map_common_io(void)
  55 {
  56         iotable_init(tegra_io_desc, ARRAY_SIZE(tegra_io_desc));
  57 }
  58
  59 /*
  60  * Intercept ioremap() requests for addresses in our fixed mapping regions.
  61  */
  62 void __iomem *tegra_ioremap(unsigned long p, size_t size, unsigned int type)
  63 {
  64         void __iomem *v = IO_ADDRESS(p);
  65         if (v == NULL)
  66                 v = __arm_ioremap(p, size, type);
  67         return v;
  68 }
  69 EXPORT_SYMBOL(tegra_ioremap);
  70
  71 void tegra_iounmap(volatile void __iomem *addr)
  72 {
  73         unsigned long virt = (unsigned long)addr;
  74
  75         if (virt >= VMALLOC_START && virt < VMALLOC_END)
  76                 __iounmap(addr);
  77 }
  78 EXPORT_SYMBOL(tegra_iounmap);