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 <linux/bug.h>
  18#include <linux/kernel.h>
  19
  20#include <linux/types.h>
  21
  22#define XCHAL_KIO_CACHED_VADDR  0xe0000000
  23#define XCHAL_KIO_BYPASS_VADDR  0xf0000000
  24#define XCHAL_KIO_PADDR         0xf0000000
  25#define XCHAL_KIO_SIZE          0x10000000
  26
  27#define IOADDR(x)               (XCHAL_KIO_BYPASS_VADDR + (x))
  28#define IO_SPACE_LIMIT ~0
  29
  30#ifdef CONFIG_MMU
  31/*
  32 * Return the virtual address for the specified bus memory.
  33 * Note that we currently don't support any address outside the KIO segment.
  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                BUG();
  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                BUG();
  53}
  54
  55#define ioremap_wc ioremap_nocache
  56
  57static inline void __iomem *ioremap(unsigned long offset, unsigned long size)
  58{
  59        return ioremap_nocache(offset, size);
  60}
  61
  62static inline void iounmap(volatile void __iomem *addr)
  63{
  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/*
  72 * Generic I/O
  73 */
  74#define readb_relaxed readb
  75#define readw_relaxed readw
  76#define readl_relaxed readl
  77
  78#endif  /* __KERNEL__ */
  79
  80#include <asm-generic/io.h>
  81
  82#endif  /* _XTENSA_IO_H */
  83