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  { IO_VIRT,             IO_PHYS,             IO_SIZE,              MT_DEVICE },
  30 };
  31
  32 #ifdef CONFIG_ARCH_OMAP730
  33 static struct map_desc omap730_io_desc[] __initdata = {
  34  { OMAP730_DSP_BASE,    OMAP730_DSP_START,    OMAP730_DSP_SIZE,    MT_DEVICE },
  35  { OMAP730_DSPREG_BASE, OMAP730_DSPREG_START, OMAP730_DSPREG_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 };
  44 #endif
  45
  46 #if defined(CONFIG_ARCH_OMAP16XX)
  47 static struct map_desc omap16xx_io_desc[] __initdata = {
  48  { OMAP16XX_DSP_BASE,    OMAP16XX_DSP_START,    OMAP16XX_DSP_SIZE,    MT_DEVICE },
  49  { OMAP16XX_DSPREG_BASE, OMAP16XX_DSPREG_START, OMAP16XX_DSPREG_SIZE, MT_DEVICE },
  50 };
  51 #endif
  52
  53 static int initialized = 0;
  54
  55 static void __init _omap_map_io(void)
  56 {
  57         initialized = 1;
  58
  59         /* We have to initialize the IO space mapping before we can run
  60          * cpu_is_omapxxx() macros. */
  61         iotable_init(omap_io_desc, ARRAY_SIZE(omap_io_desc));
  62         omap_check_revision();
  63
  64 #ifdef CONFIG_ARCH_OMAP730
  65         if (cpu_is_omap730()) {
  66                 iotable_init(omap730_io_desc, ARRAY_SIZE(omap730_io_desc));
  67         }
  68 #endif
  69 #ifdef CONFIG_ARCH_OMAP1510
  70         if (cpu_is_omap1510()) {
  71                 iotable_init(omap1510_io_desc, ARRAY_SIZE(omap1510_io_desc));
  72         }
  73 #endif
  74 #if defined(CONFIG_ARCH_OMAP16XX)
  75         if (cpu_is_omap16xx()) {
  76                 iotable_init(omap16xx_io_desc, ARRAY_SIZE(omap16xx_io_desc));
  77         }
  78 #endif
  79
  80         omap_sram_init();
  81
  82         /* REVISIT: Refer to OMAP5910 Errata, Advisory SYS_1: "Timeout Abort
  83          * on a Posted Write in the TIPB Bridge".
  84          */
  85         omap_writew(0x0, MPU_PUBLIC_TIPB_CNTL);
  86         omap_writew(0x0, MPU_PRIVATE_TIPB_CNTL);
  87
  88         /* Must init clocks early to assure that timer interrupt works
  89          */
  90         clk_init();
  91 }
  92
  93 /*
  94  * This should only get called from board specific init
  95  */
  96 void __init omap_map_common_io(void)
  97 {
  98         if (!initialized)
  99                 _omap_map_io();
 100 }
 101