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 <asm/page.h>
  28 #include <asm/mach/map.h>
  29
  30 #include "board.h"
  31
  32 static struct map_desc tegra_io_desc[] __initdata = {
  33         {
  34                 .virtual = IO_PPSB_VIRT,
  35                 .pfn = __phys_to_pfn(IO_PPSB_PHYS),
  36                 .length = IO_PPSB_SIZE,
  37                 .type = MT_DEVICE,
  38         },
  39         {
  40                 .virtual = IO_APB_VIRT,
  41                 .pfn = __phys_to_pfn(IO_APB_PHYS),
  42                 .length = IO_APB_SIZE,
  43                 .type = MT_DEVICE,
  44         },
  45         {
  46                 .virtual = IO_CPU_VIRT,
  47                 .pfn = __phys_to_pfn(IO_CPU_PHYS),
  48                 .length = IO_CPU_SIZE,
  49                 .type = MT_DEVICE,
  50         },
  51         {
  52                 .virtual = IO_IRAM_VIRT,
  53                 .pfn = __phys_to_pfn(IO_IRAM_PHYS),
  54                 .length = IO_IRAM_SIZE,
  55                 .type = MT_DEVICE,
  56         },
  57 };
  58
  59 void __init tegra_map_common_io(void)
  60 {
  61         iotable_init(tegra_io_desc, ARRAY_SIZE(tegra_io_desc));
  62 }
  63
  64 /*
  65  * Intercept ioremap() requests for addresses in our fixed mapping regions.
  66  */
  67 void __iomem *tegra_ioremap(unsigned long p, size_t size, unsigned int type)
  68 {
  69         void __iomem *v = IO_ADDRESS(p);
  70         if (v == NULL)
  71                 v = __arm_ioremap(p, size, type);
  72         return v;
  73 }
  74 EXPORT_SYMBOL(tegra_ioremap);
  75
  76 void tegra_iounmap(volatile void __iomem *addr)
  77 {
  78         unsigned long virt = (unsigned long)addr;
  79
  80         if (virt >= VMALLOC_START && virt < VMALLOC_END)
  81                 __iounmap(addr);
  82 }
  83 EXPORT_SYMBOL(tegra_iounmap);