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/module.h>
  12 #include <linux/kernel.h>
  13 #include <linux/init.h>
  14
  15 #include <asm/tlb.h>
  16 #include <asm/mach/map.h>
  17 #include <asm/io.h>
  18 #include <asm/arch/mux.h>
  19 #include <asm/arch/tc.h>
  20
  21 extern int omap1_clk_init(void);
  22 extern void omap_check_revision(void);
  23 extern void omap_sram_init(void);
  24 extern void omapfb_reserve_sdram(void);
  25
  26 /*
  27  * The machine specific code may provide the extra mapping besides the
  28  * default mapping provided here.
  29  */
  30 static struct map_desc omap_io_desc[] __initdata = {
  31         {
  32                 .virtual        = IO_VIRT,
  33                 .pfn            = __phys_to_pfn(IO_PHYS),
  34                 .length         = IO_SIZE,
  35                 .type           = MT_DEVICE
  36         }
  37 };
  38
  39 #ifdef CONFIG_ARCH_OMAP730
  40 static struct map_desc omap730_io_desc[] __initdata = {
  41         {
  42                 .virtual        = OMAP730_DSP_BASE,
  43                 .pfn            = __phys_to_pfn(OMAP730_DSP_START),
  44                 .length         = OMAP730_DSP_SIZE,
  45                 .type           = MT_DEVICE
  46         }, {
  47                 .virtual        = OMAP730_DSPREG_BASE,
  48                 .pfn            = __phys_to_pfn(OMAP730_DSPREG_START),
  49                 .length         = OMAP730_DSPREG_SIZE,
  50                 .type           = MT_DEVICE
  51         }
  52 };
  53 #endif
  54
  55 #ifdef CONFIG_ARCH_OMAP15XX
  56 static struct map_desc omap1510_io_desc[] __initdata = {
  57         {
  58                 .virtual        = OMAP1510_DSP_BASE,
  59                 .pfn            = __phys_to_pfn(OMAP1510_DSP_START),
  60                 .length         = OMAP1510_DSP_SIZE,
  61                 .type           = MT_DEVICE
  62         }, {
  63                 .virtual        = OMAP1510_DSPREG_BASE,
  64                 .pfn            = __phys_to_pfn(OMAP1510_DSPREG_START),
  65                 .length         = OMAP1510_DSPREG_SIZE,
  66                 .type           = MT_DEVICE
  67         }
  68 };
  69 #endif
  70
  71 #if defined(CONFIG_ARCH_OMAP16XX)
  72 static struct map_desc omap16xx_io_desc[] __initdata = {
  73         {
  74                 .virtual        = OMAP16XX_DSP_BASE,
  75                 .pfn            = __phys_to_pfn(OMAP16XX_DSP_START),
  76                 .length         = OMAP16XX_DSP_SIZE,
  77                 .type           = MT_DEVICE
  78         }, {
  79                 .virtual        = OMAP16XX_DSPREG_BASE,
  80                 .pfn            = __phys_to_pfn(OMAP16XX_DSPREG_START),
  81                 .length         = OMAP16XX_DSPREG_SIZE,
  82                 .type           = MT_DEVICE
  83         }
  84 };
  85 #endif
  86
  87 /*
  88  * Maps common IO regions for omap1. This should only get called from
  89  * board specific init.
  90  */
  91 void __init omap1_map_common_io(void)
  92 {
  93         iotable_init(omap_io_desc, ARRAY_SIZE(omap_io_desc));
  94
  95         /* Normally devicemaps_init() would flush caches and tlb after
  96          * mdesc->map_io(), but we must also do it here because of the CPU
  97          * revision check below.
  98          */
  99         local_flush_tlb_all();
 100         flush_cache_all();
 101
 102         /* We want to check CPU revision early for cpu_is_omapxxxx() macros.
 103          * IO space mapping must be initialized before we can do that.
 104          */
 105         omap_check_revision();
 106
 107 #ifdef CONFIG_ARCH_OMAP730
 108         if (cpu_is_omap730()) {
 109                 iotable_init(omap730_io_desc, ARRAY_SIZE(omap730_io_desc));
 110         }
 111 #endif
 112 #ifdef CONFIG_ARCH_OMAP15XX
 113         if (cpu_is_omap15xx()) {
 114                 iotable_init(omap1510_io_desc, ARRAY_SIZE(omap1510_io_desc));
 115         }
 116 #endif
 117 #if defined(CONFIG_ARCH_OMAP16XX)
 118         if (cpu_is_omap16xx()) {
 119                 iotable_init(omap16xx_io_desc, ARRAY_SIZE(omap16xx_io_desc));
 120         }
 121 #endif
 122
 123         omap_sram_init();
 124         omapfb_reserve_sdram();
 125 }
 126
 127 /*
 128  * Common low-level hardware init for omap1. This should only get called from
 129  * board specific init.
 130  */
 131 void __init omap1_init_common_hw()
 132 {
 133         /* REVISIT: Refer to OMAP5910 Errata, Advisory SYS_1: "Timeout Abort
 134          * on a Posted Write in the TIPB Bridge".
 135          */
 136         omap_writew(0x0, MPU_PUBLIC_TIPB_CNTL);
 137         omap_writew(0x0, MPU_PRIVATE_TIPB_CNTL);
 138
 139         /* Must init clocks early to assure that timer interrupt works
 140          */
 141         omap1_clk_init();
 142
 143         omap1_mux_init();
 144 }
 145