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
  28#if XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY && defined(CONFIG_OF)
  29extern unsigned long xtensa_kio_paddr;
  30
  31static inline unsigned long xtensa_get_kio_paddr(void)
  32{
  33        return xtensa_kio_paddr;
  34}
  35#endif
  36
  37/*
  38 * Return the virtual address for the specified bus memory.
  39 * Note that we currently don't support any address outside the KIO segment.
  40 */
  41static inline void __iomem *ioremap_nocache(unsigned long offset,
  42                unsigned long size)
  43{
  44        if (offset >= XCHAL_KIO_PADDR
  45            && offset - XCHAL_KIO_PADDR < XCHAL_KIO_SIZE)
  46                return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_BYPASS_VADDR);
  47        else
  48                BUG();
  49}
  50
  51static inline void __iomem *ioremap_cache(unsigned long offset,
  52                unsigned long size)
  53{
  54        if (offset >= XCHAL_KIO_PADDR
  55            && offset - XCHAL_KIO_PADDR < XCHAL_KIO_SIZE)
  56                return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_CACHED_VADDR);
  57        else
  58                BUG();
  59}
  60
  61#define ioremap_wc ioremap_nocache
  62
  63static inline void __iomem *ioremap(unsigned long offset, unsigned long size)
  64{
  65        return ioremap_nocache(offset, size);
  66}
  67
  68static inline void iounmap(volatile void __iomem *addr)
  69{
  70}
  71
  72#define virt_to_bus     virt_to_phys
  73#define bus_to_virt     phys_to_virt
  74
  75#endif /* CONFIG_MMU */
  76
  77/*
  78 * Generic I/O
  79 */
  80#define readb_relaxed readb
  81#define readw_relaxed readw
  82#define readl_relaxed readl
  83
  84#endif  /* __KERNEL__ */
  85
  86#include <asm-generic/io.h>
  87
  88#endif  /* _XTENSA_IO_H */
  89