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#ifdef __KERNEL__
  15#include <asm/byteorder.h>
  16#include <asm/page.h>
  17#include <asm/vectors.h>
  18#include <linux/bug.h>
  19#include <linux/kernel.h>
  20
  21#include <linux/types.h>
  22
  23#define IOADDR(x)               (XCHAL_KIO_BYPASS_VADDR + (x))
  24#define IO_SPACE_LIMIT ~0
  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_nocache(unsigned long offset,
  36                unsigned long size)
  37{
  38        if (offset >= XCHAL_KIO_PADDR
  39            && offset - XCHAL_KIO_PADDR < XCHAL_KIO_SIZE)
  40                return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_BYPASS_VADDR);
  41        else
  42                return xtensa_ioremap_nocache(offset, size);
  43}
  44
  45static inline void __iomem *ioremap_cache(unsigned long offset,
  46                unsigned long size)
  47{
  48        if (offset >= XCHAL_KIO_PADDR
  49            && offset - XCHAL_KIO_PADDR < XCHAL_KIO_SIZE)
  50                return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_CACHED_VADDR);
  51        else
  52                return xtensa_ioremap_cache(offset, size);
  53}
  54#define ioremap_cache ioremap_cache
  55
  56#define ioremap_wc ioremap_nocache
  57#define ioremap_wt ioremap_nocache
  58
  59static inline void __iomem *ioremap(unsigned long offset, unsigned long size)
  60{
  61        return ioremap_nocache(offset, size);
  62}
  63
  64static inline void iounmap(volatile void __iomem *addr)
  65{
  66        unsigned long va = (unsigned long) addr;
  67
  68        if (!(va >= XCHAL_KIO_CACHED_VADDR &&
  69              va - XCHAL_KIO_CACHED_VADDR < XCHAL_KIO_SIZE) &&
  70            !(va >= XCHAL_KIO_BYPASS_VADDR &&
  71              va - XCHAL_KIO_BYPASS_VADDR < XCHAL_KIO_SIZE))
  72                xtensa_iounmap(addr);
  73}
  74
  75#define virt_to_bus     virt_to_phys
  76#define bus_to_virt     phys_to_virt
  77
  78#endif /* CONFIG_MMU */
  79
  80#endif  /* __KERNEL__ */
  81
  82#include <asm-generic/io.h>
  83
  84#endif  /* _XTENSA_IO_H */
  85