arch/arm/mach-omap1/io.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * linux/arch/arm/mach-omap1/io.c
   4  *
   5  * OMAP1 I/O mapping code
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/kernel.h>
  10 #include <linux/init.h>
  11 #include <linux/io.h>
  12 #include <linux/omap-dma.h>
  13
  14 #include <asm/tlb.h>
  15 #include <asm/mach/map.h>
  16
  17 #include "tc.h"
  18 #include "iomap.h"
  19 #include "common.h"
  20
  21 /*
  22  * The machine specific code may provide the extra mapping besides the
  23  * default mapping provided here.
  24  */
  25 static struct map_desc omap1_io_desc[] __initdata = {
  26         {
  27                 .virtual        = OMAP1_IO_VIRT,
  28                 .pfn            = __phys_to_pfn(OMAP1_IO_PHYS),
  29                 .length         = OMAP1_IO_SIZE,
  30                 .type           = MT_DEVICE
  31         }, {
  32                 .virtual        = OMAP1_DSP_BASE,
  33                 .pfn            = __phys_to_pfn(OMAP1_DSP_START),
  34                 .length         = OMAP1_DSP_SIZE,
  35                 .type           = MT_DEVICE
  36         }, {
  37                 .virtual        = OMAP1_DSPREG_BASE,
  38                 .pfn            = __phys_to_pfn(OMAP1_DSPREG_START),
  39                 .length         = OMAP1_DSPREG_SIZE,
  40                 .type           = MT_DEVICE
  41         }
  42 };
  43
  44 /*
  45  * Maps common IO regions for omap1
  46  */
  47 void __init omap1_map_io(void)
  48 {
  49         iotable_init(omap1_io_desc, ARRAY_SIZE(omap1_io_desc));
  50 }
  51
  52 /*
  53  * Common low-level hardware init for omap1.
  54  */
  55 void __init omap1_init_early(void)
  56 {
  57         omap_check_revision();
  58
  59         /* REVISIT: Refer to OMAP5910 Errata, Advisory SYS_1: "Timeout Abort
  60          * on a Posted Write in the TIPB Bridge".
  61          */
  62         omap_writew(0x0, MPU_PUBLIC_TIPB_CNTL);
  63         omap_writew(0x0, MPU_PRIVATE_TIPB_CNTL);
  64 }
  65
  66 void __init omap1_init_late(void)
  67 {
  68         omap_serial_wakeup_init();
  69 }
  70
  71 /*
  72  * NOTE: Please use ioremap + __raw_read/write where possible instead of these
  73  */
  74
  75 u8 omap_readb(u32 pa)
  76 {
  77         return __raw_readb(OMAP1_IO_ADDRESS(pa));
  78 }
  79 EXPORT_SYMBOL(omap_readb);
  80
  81 u16 omap_readw(u32 pa)
  82 {
  83         return __raw_readw(OMAP1_IO_ADDRESS(pa));
  84 }
  85 EXPORT_SYMBOL(omap_readw);
  86
  87 u32 omap_readl(u32 pa)
  88 {
  89         return __raw_readl(OMAP1_IO_ADDRESS(pa));
  90 }
  91 EXPORT_SYMBOL(omap_readl);
  92
  93 void omap_writeb(u8 v, u32 pa)
  94 {
  95         __raw_writeb(v, OMAP1_IO_ADDRESS(pa));
  96 }
  97 EXPORT_SYMBOL(omap_writeb);
  98
  99 void omap_writew(u16 v, u32 pa)
 100 {
 101         __raw_writew(v, OMAP1_IO_ADDRESS(pa));
 102 }
 103 EXPORT_SYMBOL(omap_writew);
 104
 105 void omap_writel(u32 v, u32 pa)
 106 {
 107         __raw_writel(v, OMAP1_IO_ADDRESS(pa));
 108 }
 109 EXPORT_SYMBOL(omap_writel);