arch/arm/mach-msm/io.c

   1 /* arch/arm/mach-msm/io.c
   2  *
   3  * MSM7K io support
   4  *
   5  * Copyright (C) 2007 Google, Inc.
   6  * Author: Brian Swetland <swetland@google.com>
   7  *
   8  * This software is licensed under the terms of the GNU General Public
   9  * License version 2, as published by the Free Software Foundation, and
  10  * may be copied, distributed, and modified under those terms.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  */
  18
  19 #include <linux/kernel.h>
  20 #include <linux/init.h>
  21 #include <linux/io.h>
  22
  23 #include <mach/hardware.h>
  24 #include <asm/page.h>
  25 #include <mach/msm_iomap.h>
  26 #include <asm/mach/map.h>
  27
  28 #include <mach/board.h>
  29
  30 #define MSM_DEVICE(name) { \
  31                 .virtual = (unsigned long) MSM_##name##_BASE, \
  32                 .pfn = __phys_to_pfn(MSM_##name##_PHYS), \
  33                 .length = MSM_##name##_SIZE, \
  34                 .type = MT_DEVICE_NONSHARED, \
  35          }
  36
  37 static struct map_desc msm_io_desc[] __initdata = {
  38         MSM_DEVICE(VIC),
  39         MSM_DEVICE(CSR),
  40         MSM_DEVICE(GPT),
  41         MSM_DEVICE(DMOV),
  42         MSM_DEVICE(GPIO1),
  43         MSM_DEVICE(GPIO2),
  44         MSM_DEVICE(CLK_CTL),
  45         {
  46                 .virtual =  (unsigned long) MSM_SHARED_RAM_BASE,
  47                 .pfn =      __phys_to_pfn(MSM_SHARED_RAM_PHYS),
  48                 .length =   MSM_SHARED_RAM_SIZE,
  49                 .type =     MT_DEVICE,
  50         },
  51 };
  52
  53 void __init msm_map_common_io(void)
  54 {
  55         /* Make sure the peripheral register window is closed, since
  56          * we will use PTE flags (TEX[1]=1,B=0,C=1) to determine which
  57          * pages are peripheral interface or not.
  58          */
  59         asm("mcr p15, 0, %0, c15, c2, 4" : : "r" (0));
  60
  61         iotable_init(msm_io_desc, ARRAY_SIZE(msm_io_desc));
  62 }
  63
  64 void __iomem *
  65 __msm_ioremap(unsigned long phys_addr, size_t size, unsigned int mtype)
  66 {
  67         if (mtype == MT_DEVICE) {
  68                 /* The peripherals in the 88000000 - D0000000 range
  69                  * are only accessable by type MT_DEVICE_NONSHARED.
  70                  * Adjust mtype as necessary to make this "just work."
  71                  */
  72                 if ((phys_addr >= 0x88000000) && (phys_addr < 0xD0000000))
  73                         mtype = MT_DEVICE_NONSHARED;
  74         }
  75
  76         return __arm_ioremap(phys_addr, size, mtype);
  77 }