LXR linux/arch/xtensa/include/asm/io.h

   1/*
   2 * include/asm-xtensa/io.h
   3 *
   4 * This file is subject to the terms and conditions of the GNU General Public
   5 * License.  See the file "COPYING" in the main directory of this archive
   6 * for more details.
   7 *
   8 * Copyright (C) 2001 - 2005 Tensilica Inc.
   9 */
  10
  11#ifndef _XTENSA_IO_H
  12#define _XTENSA_IO_H
  13
  14#include <asm/byteorder.h>
  15#include <asm/page.h>
  16#include <asm/vectors.h>
  17#include <linux/bug.h>
  18#include <linux/kernel.h>
  19
  20#include <linux/types.h>
  21
  22#define IOADDR(x)               (XCHAL_KIO_BYPASS_VADDR + (x))
  23#define IO_SPACE_LIMIT ~0
  24#define PCI_IOBASE              ((void __iomem *)XCHAL_KIO_BYPASS_VADDR)
  25
  26#ifdef CONFIG_MMU
  27
  28void __iomem *xtensa_ioremap_nocache(unsigned long addr, unsigned long size);
  29void __iomem *xtensa_ioremap_cache(unsigned long addr, unsigned long size);
  30void xtensa_iounmap(volatile void __iomem *addr);
  31
  32/*
  33 * Return the virtual address for the specified bus memory.
  34 */
  35static inline void __iomem *ioremap(unsigned long offset, unsigned long size)
  36{
  37        if (offset >= XCHAL_KIO_PADDR
  38            && offset - XCHAL_KIO_PADDR < XCHAL_KIO_SIZE)
  39                return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_BYPASS_VADDR);
  40        else
  41                return xtensa_ioremap_nocache(offset, size);
  42}
  43
  44static inline void __iomem *ioremap_cache(unsigned long offset,
  45                unsigned long size)
  46{
  47        if (offset >= XCHAL_KIO_PADDR
  48            && offset - XCHAL_KIO_PADDR < XCHAL_KIO_SIZE)
  49                return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_CACHED_VADDR);
  50        else
  51                return xtensa_ioremap_cache(offset, size);
  52}
  53#define ioremap_cache ioremap_cache
  54
  55static inline void iounmap(volatile void __iomem *addr)
  56{
  57        unsigned long va = (unsigned long) addr;
  58
  59        if (!(va >= XCHAL_KIO_CACHED_VADDR &&
  60              va - XCHAL_KIO_CACHED_VADDR < XCHAL_KIO_SIZE) &&
  61            !(va >= XCHAL_KIO_BYPASS_VADDR &&
  62              va - XCHAL_KIO_BYPASS_VADDR < XCHAL_KIO_SIZE))
  63                xtensa_iounmap(addr);
  64}
  65
  66#define virt_to_bus     virt_to_phys
  67#define bus_to_virt     phys_to_virt
  68
  69#endif /* CONFIG_MMU */
  70
  71#include <asm-generic/io.h>
  72
  73#endif  /* _XTENSA_IO_H */
  74