include/asm-arm/arch-omap/io.h

   1 /*
   2  * linux/include/asm-arm/arch-omap/io.h
   3  *
   4  * IO definitions for TI OMAP processors and boards
   5  *
   6  * Copied from linux/include/asm-arm/arch-sa1100/io.h
   7  * Copyright (C) 1997-1999 Russell King
   8  *
   9  * This program is free software; you can redistribute it and/or modify it
  10  * under the terms of the GNU General Public License as published by the
  11  * Free Software Foundation; either version 2 of the License, or (at your
  12  * option) any later version.
  13  *
  14  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  15  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  16  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
  17  * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  20  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  21  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  *
  25  * You should have received a copy of the GNU General Public License along
  26  * with this program; if not, write to the Free Software Foundation, Inc.,
  27  * 675 Mass Ave, Cambridge, MA 02139, USA.
  28  *
  29  * Modifications:
  30  *  06-12-1997  RMK     Created.
  31  *  07-04-1999  RMK     Major cleanup
  32  */
  33
  34 #ifndef __ASM_ARM_ARCH_IO_H
  35 #define __ASM_ARM_ARCH_IO_H
  36
  37 #define IO_SPACE_LIMIT 0xffffffff
  38
  39 /*
  40  * We don't actually have real ISA nor PCI buses, but there is so many
  41  * drivers out there that might just work if we fake them...
  42  */
  43 #define __io(a)                 ((void __iomem *)(PCIO_BASE + (a)))
  44 #define __mem_pci(a)            (a)
  45 #define __mem_isa(a)            (a)
  46
  47 /*
  48  * ----------------------------------------------------------------------------
  49  * I/O mapping
  50  * ----------------------------------------------------------------------------
  51  */
  52 #define IO_PHYS                 0xFFFB0000
  53 #define IO_OFFSET               0x01000000      /* Virtual IO = 0xfefb0000 */
  54 #define IO_VIRT                 (IO_PHYS - IO_OFFSET)
  55 #define IO_SIZE                 0x40000
  56 #define IO_ADDRESS(x)           ((x) - IO_OFFSET)
  57
  58 #define PCIO_BASE               0
  59
  60 #define io_p2v(x)               ((x) - IO_OFFSET)
  61 #define io_v2p(x)               ((x) + IO_OFFSET)
  62
  63 #ifndef __ASSEMBLER__
  64
  65 /*
  66  * Functions to access the OMAP IO region
  67  *
  68  * NOTE: - Use omap_read/write[bwl] for physical register addresses
  69  *       - Use __raw_read/write[bwl]() for virtual register addresses
  70  *       - Use IO_ADDRESS(phys_addr) to convert registers to virtual addresses
  71  *       - DO NOT use hardcoded virtual addresses to allow changing the
  72  *         IO address space again if needed
  73  */
  74 #define omap_readb(a)           (*(volatile unsigned char  *)IO_ADDRESS(a))
  75 #define omap_readw(a)           (*(volatile unsigned short *)IO_ADDRESS(a))
  76 #define omap_readl(a)           (*(volatile unsigned int   *)IO_ADDRESS(a))
  77
  78 #define omap_writeb(v,a)        (*(volatile unsigned char  *)IO_ADDRESS(a) = (v))
  79 #define omap_writew(v,a)        (*(volatile unsigned short *)IO_ADDRESS(a) = (v))
  80 #define omap_writel(v,a)        (*(volatile unsigned int   *)IO_ADDRESS(a) = (v))
  81
  82 /* 16 bit uses LDRH/STRH, base +/- offset_8 */
  83 typedef struct { volatile u16 offset[256]; } __regbase16;
  84 #define __REGV16(vaddr)         ((__regbase16 *)((vaddr)&~0xff)) \
  85                                         ->offset[((vaddr)&0xff)>>1]
  86 #define __REG16(paddr)          __REGV16(io_p2v(paddr))
  87
  88 /* 8/32 bit uses LDR/STR, base +/- offset_12 */
  89 typedef struct { volatile u8 offset[4096]; } __regbase8;
  90 #define __REGV8(vaddr)          ((__regbase8  *)((vaddr)&~4095)) \
  91                                         ->offset[((vaddr)&4095)>>0]
  92 #define __REG8(paddr)           __REGV8(io_p2v(paddr))
  93
  94 typedef struct { volatile u32 offset[4096]; } __regbase32;
  95 #define __REGV32(vaddr)         ((__regbase32 *)((vaddr)&~4095)) \
  96                                         ->offset[((vaddr)&4095)>>2]
  97 #define __REG32(paddr)          __REGV32(io_p2v(paddr))
  98
  99 #else
 100
 101 #define __REG8(paddr)           io_p2v(paddr)
 102 #define __REG16(paddr)          io_p2v(paddr)
 103 #define __REG32(paddr)          io_p2v(paddr)
 104
 105 #endif
 106
 107 #endif