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
  23 /*
  24  * The machine specific code may provide the extra mapping besides the
  25  * default mapping provided here.
  26  */
  27 static struct map_desc omap_io_desc[] __initdata = {
  28  { IO_VIRT,             IO_PHYS,             IO_SIZE,              MT_DEVICE },
  29 };
  30
  31 #ifdef CONFIG_ARCH_OMAP730
  32 static struct map_desc omap730_io_desc[] __initdata = {
  33  { OMAP730_DSP_BASE,    OMAP730_DSP_START,    OMAP730_DSP_SIZE,    MT_DEVICE },
  34  { OMAP730_DSPREG_BASE, OMAP730_DSPREG_START, OMAP730_DSPREG_SIZE, MT_DEVICE },
  35  { OMAP730_SRAM_BASE,   OMAP730_SRAM_START,   OMAP730_SRAM_SIZE,   MT_DEVICE }
  36 };
  37 #endif
  38
  39 #ifdef CONFIG_ARCH_OMAP1510
  40 static struct map_desc omap1510_io_desc[] __initdata = {
  41  { OMAP1510_DSP_BASE,    OMAP1510_DSP_START,    OMAP1510_DSP_SIZE,    MT_DEVICE },
  42  { OMAP1510_DSPREG_BASE, OMAP1510_DSPREG_START, OMAP1510_DSPREG_SIZE, MT_DEVICE },
  43  { OMAP1510_SRAM_BASE,   OMAP1510_SRAM_START,   OMAP1510_SRAM_SIZE,   MT_DEVICE }
  44 };
  45 #endif
  46
  47 #if defined(CONFIG_ARCH_OMAP16XX)
  48 static struct map_desc omap1610_io_desc[] __initdata = {
  49  { OMAP16XX_DSP_BASE,    OMAP16XX_DSP_START,    OMAP16XX_DSP_SIZE,    MT_DEVICE },
  50  { OMAP16XX_DSPREG_BASE, OMAP16XX_DSPREG_START, OMAP16XX_DSPREG_SIZE, MT_DEVICE },
  51  { OMAP16XX_SRAM_BASE,   OMAP16XX_SRAM_START,   OMAP1610_SRAM_SIZE,   MT_DEVICE }
  52 };
  53
  54 static struct map_desc omap5912_io_desc[] __initdata = {
  55  { OMAP16XX_DSP_BASE,    OMAP16XX_DSP_START,    OMAP16XX_DSP_SIZE,    MT_DEVICE },
  56  { OMAP16XX_DSPREG_BASE, OMAP16XX_DSPREG_START, OMAP16XX_DSPREG_SIZE, MT_DEVICE },
  57 /*
  58  * The OMAP5912 has 250kByte internal SRAM. Because the mapping is baseed on page
  59  * size (4kByte), it seems that the last 2kByte (=0x800) of the 250kByte are not mapped.
  60  * Add additional 2kByte (0x800) so that the last page is mapped and the last 2kByte
  61  * can be used.
  62  */
  63  { OMAP16XX_SRAM_BASE,   OMAP16XX_SRAM_START,   OMAP5912_SRAM_SIZE + 0x800,   MT_DEVICE }
  64 };
  65 #endif
  66
  67 static int initialized = 0;
  68
  69 static void __init _omap_map_io(void)
  70 {
  71         initialized = 1;
  72
  73         /* We have to initialize the IO space mapping before we can run
  74          * cpu_is_omapxxx() macros. */
  75         iotable_init(omap_io_desc, ARRAY_SIZE(omap_io_desc));
  76         omap_check_revision();
  77
  78 #ifdef CONFIG_ARCH_OMAP730
  79         if (cpu_is_omap730()) {
  80                 iotable_init(omap730_io_desc, ARRAY_SIZE(omap730_io_desc));
  81         }
  82 #endif
  83 #ifdef CONFIG_ARCH_OMAP1510
  84         if (cpu_is_omap1510()) {
  85                 iotable_init(omap1510_io_desc, ARRAY_SIZE(omap1510_io_desc));
  86         }
  87 #endif
  88 #if defined(CONFIG_ARCH_OMAP16XX)
  89         if (cpu_is_omap1610() || cpu_is_omap1710()) {
  90                 iotable_init(omap1610_io_desc, ARRAY_SIZE(omap1610_io_desc));
  91         }
  92         if (cpu_is_omap5912()) {
  93                 iotable_init(omap5912_io_desc, ARRAY_SIZE(omap5912_io_desc));
  94         }
  95 #endif
  96
  97         /* REVISIT: Refer to OMAP5910 Errata, Advisory SYS_1: "Timeout Abort
  98          * on a Posted Write in the TIPB Bridge".
  99          */
 100         omap_writew(0x0, MPU_PUBLIC_TIPB_CNTL);
 101         omap_writew(0x0, MPU_PRIVATE_TIPB_CNTL);
 102
 103         /* Must init clocks early to assure that timer interrupt works
 104          */
 105         clk_init();
 106 }
 107
 108 /*
 109  * This should only get called from board specific init
 110  */
 111 void omap_map_common_io(void)
 112 {
 113         if (!initialized)
 114                 _omap_map_io();
 115 }