arch/arm/mach-omap1/io.c

   1 /*
   2  * linux/arch/arm/mach-omap1/io.c
   3  *
   4  * OMAP1 I/O mapping code
   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/config.h>
  12 #include <linux/module.h>
  13 #include <linux/kernel.h>
  14 #include <linux/init.h>
  15
  16 #include <asm/mach/map.h>
  17 #include <asm/io.h>
  18 #include <asm/arch/tc.h>
  19
  20 extern int clk_init(void);
  21 extern void omap_check_revision(void);
  22 extern void omap_sram_init(void);
  23
  24 /*
  25  * The machine specific code may provide the extra mapping besides the
  26  * default mapping provided here.
  27  */
  28 static struct map_desc omap_io_desc[] __initdata = {
  29         {
  30                 .virtual        = IO_VIRT,
  31                 .pfn            = __phys_to_pfn(IO_PHYS),
  32                 .length         = IO_SIZE,
  33                 .type           = MT_DEVICE
  34         }
  35 };
  36
  37 #ifdef CONFIG_ARCH_OMAP730
  38 static struct map_desc omap730_io_desc[] __initdata = {
  39         {
  40                 .virtual        = OMAP730_DSP_BASE,
  41                 .pfn            = __phys_to_pfn(OMAP730_DSP_START),
  42                 .length         = OMAP730_DSP_SIZE,
  43                 .type           = MT_DEVICE
  44         }, {
  45                 .virtual        = OMAP730_DSPREG_BASE,
  46                 .pfn            = __phys_to_pfn(OMAP730_DSPREG_START),
  47                 .length         = OMAP730_DSPREG_SIZE,
  48                 .type           = MT_DEVICE
  49         }
  50 };
  51 #endif
  52
  53 #ifdef CONFIG_ARCH_OMAP1510
  54 static struct map_desc omap1510_io_desc[] __initdata = {
  55         {
  56                 .virtual        = OMAP1510_DSP_BASE,
  57                 .pfn            = __phys_to_pfn(OMAP1510_DSP_START),
  58                 .length         = OMAP1510_DSP_SIZE,
  59                 .type           = MT_DEVICE
  60         }, {
  61                 .virtual        = OMAP1510_DSPREG_BASE,
  62                 .pfn            = __phys_to_pfn(OMAP1510_DSPREG_START),
  63                 .length         = OMAP1510_DSPREG_SIZE,
  64                 .type           = MT_DEVICE
  65         }
  66 };
  67 #endif
  68
  69 #if defined(CONFIG_ARCH_OMAP16XX)
  70 static struct map_desc omap16xx_io_desc[] __initdata = {
  71         {
  72                 .virtual        = OMAP16XX_DSP_BASE,
  73                 .pfn            = __phys_to_pfn(OMAP16XX_DSP_START),
  74                 .length         = OMAP16XX_DSP_SIZE,
  75                 .type           = MT_DEVICE
  76         }, {
  77                 .virtual        = OMAP16XX_DSPREG_BASE,
  78                 .pfn            = __phys_to_pfn(OMAP16XX_DSPREG_START),
  79                 .length         = OMAP16XX_DSPREG_SIZE,
  80                 .type           = MT_DEVICE
  81         }
  82 };
  83 #endif
  84
  85 static int initialized = 0;
  86
  87 static void __init _omap_map_io(void)
  88 {
  89         initialized = 1;
  90
  91         /* We have to initialize the IO space mapping before we can run
  92          * cpu_is_omapxxx() macros. */
  93         iotable_init(omap_io_desc, ARRAY_SIZE(omap_io_desc));
  94         omap_check_revision();
  95
  96 #ifdef CONFIG_ARCH_OMAP730
  97         if (cpu_is_omap730()) {
  98                 iotable_init(omap730_io_desc, ARRAY_SIZE(omap730_io_desc));
  99         }
 100 #endif
 101 #ifdef CONFIG_ARCH_OMAP1510
 102         if (cpu_is_omap1510()) {
 103                 iotable_init(omap1510_io_desc, ARRAY_SIZE(omap1510_io_desc));
 104         }
 105 #endif
 106 #if defined(CONFIG_ARCH_OMAP16XX)
 107         if (cpu_is_omap16xx()) {
 108                 iotable_init(omap16xx_io_desc, ARRAY_SIZE(omap16xx_io_desc));
 109         }
 110 #endif
 111
 112         omap_sram_init();
 113
 114         /* REVISIT: Refer to OMAP5910 Errata, Advisory SYS_1: "Timeout Abort
 115          * on a Posted Write in the TIPB Bridge".
 116          */
 117         omap_writew(0x0, MPU_PUBLIC_TIPB_CNTL);
 118         omap_writew(0x0, MPU_PRIVATE_TIPB_CNTL);
 119
 120         /* Must init clocks early to assure that timer interrupt works
 121          */
 122         clk_init();
 123 }
 124
 125 /*
 126  * This should only get called from board specific init
 127  */
 128 void __init omap_map_common_io(void)
 129 {
 130         if (!initialized)
 131                 _omap_map_io();
 132 }
 133