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/tlb.h>
  17 #include <asm/mach/map.h>
  18 #include <asm/io.h>
  19 #include <asm/arch/mux.h>
  20 #include <asm/arch/tc.h>
  21 #include <asm/arch/omapfb.h>
  22
  23 extern int omap1_clk_init(void);
  24 extern void omap_check_revision(void);
  25 extern void omap_sram_init(void);
  26
  27 /*
  28  * The machine specific code may provide the extra mapping besides the
  29  * default mapping provided here.
  30  */
  31 static struct map_desc omap_io_desc[] __initdata = {
  32         {
  33                 .virtual        = IO_VIRT,
  34                 .pfn            = __phys_to_pfn(IO_PHYS),
  35                 .length         = IO_SIZE,
  36                 .type           = MT_DEVICE
  37         }
  38 };
  39
  40 #ifdef CONFIG_ARCH_OMAP730
  41 static struct map_desc omap730_io_desc[] __initdata = {
  42         {
  43                 .virtual        = OMAP730_DSP_BASE,
  44                 .pfn            = __phys_to_pfn(OMAP730_DSP_START),
  45                 .length         = OMAP730_DSP_SIZE,
  46                 .type           = MT_DEVICE
  47         }, {
  48                 .virtual        = OMAP730_DSPREG_BASE,
  49                 .pfn            = __phys_to_pfn(OMAP730_DSPREG_START),
  50                 .length         = OMAP730_DSPREG_SIZE,
  51                 .type           = MT_DEVICE
  52         }
  53 };
  54 #endif
  55
  56 #ifdef CONFIG_ARCH_OMAP15XX
  57 static struct map_desc omap1510_io_desc[] __initdata = {
  58         {
  59                 .virtual        = OMAP1510_DSP_BASE,
  60                 .pfn            = __phys_to_pfn(OMAP1510_DSP_START),
  61                 .length         = OMAP1510_DSP_SIZE,
  62                 .type           = MT_DEVICE
  63         }, {
  64                 .virtual        = OMAP1510_DSPREG_BASE,
  65                 .pfn            = __phys_to_pfn(OMAP1510_DSPREG_START),
  66                 .length         = OMAP1510_DSPREG_SIZE,
  67                 .type           = MT_DEVICE
  68         }
  69 };
  70 #endif
  71
  72 #if defined(CONFIG_ARCH_OMAP16XX)
  73 static struct map_desc omap16xx_io_desc[] __initdata = {
  74         {
  75                 .virtual        = OMAP16XX_DSP_BASE,
  76                 .pfn            = __phys_to_pfn(OMAP16XX_DSP_START),
  77                 .length         = OMAP16XX_DSP_SIZE,
  78                 .type           = MT_DEVICE
  79         }, {
  80                 .virtual        = OMAP16XX_DSPREG_BASE,
  81                 .pfn            = __phys_to_pfn(OMAP16XX_DSPREG_START),
  82                 .length         = OMAP16XX_DSPREG_SIZE,
  83                 .type           = MT_DEVICE
  84         }
  85 };
  86 #endif
  87
  88 /*
  89  * Maps common IO regions for omap1. This should only get called from
  90  * board specific init.
  91  */
  92 void __init omap1_map_common_io(void)
  93 {
  94         iotable_init(omap_io_desc, ARRAY_SIZE(omap_io_desc));
  95
  96         /* Normally devicemaps_init() would flush caches and tlb after
  97          * mdesc->map_io(), but we must also do it here because of the CPU
  98          * revision check below.
  99          */
 100         local_flush_tlb_all();
 101         flush_cache_all();
 102
 103         /* We want to check CPU revision early for cpu_is_omapxxxx() macros.
 104          * IO space mapping must be initialized before we can do that.
 105          */
 106         omap_check_revision();
 107
 108 #ifdef CONFIG_ARCH_OMAP730
 109         if (cpu_is_omap730()) {
 110                 iotable_init(omap730_io_desc, ARRAY_SIZE(omap730_io_desc));
 111         }
 112 #endif
 113 #ifdef CONFIG_ARCH_OMAP15XX
 114         if (cpu_is_omap15xx()) {
 115                 iotable_init(omap1510_io_desc, ARRAY_SIZE(omap1510_io_desc));
 116         }
 117 #endif
 118 #if defined(CONFIG_ARCH_OMAP16XX)
 119         if (cpu_is_omap16xx()) {
 120                 iotable_init(omap16xx_io_desc, ARRAY_SIZE(omap16xx_io_desc));
 121         }
 122 #endif
 123
 124         omap_sram_init();
 125         omapfb_reserve_mem();
 126 }
 127
 128 /*
 129  * Common low-level hardware init for omap1. This should only get called from
 130  * board specific init.
 131  */
 132 void __init omap1_init_common_hw()
 133 {
 134         /* REVISIT: Refer to OMAP5910 Errata, Advisory SYS_1: "Timeout Abort
 135          * on a Posted Write in the TIPB Bridge".
 136          */
 137         omap_writew(0x0, MPU_PUBLIC_TIPB_CNTL);
 138         omap_writew(0x0, MPU_PRIVATE_TIPB_CNTL);
 139
 140         /* Must init clocks early to assure that timer interrupt works
 141          */
 142         omap1_clk_init();
 143
 144         omap1_mux_init();
 145 }
 146