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 /*
  29  * Return the virtual address for the specified bus memory.
  30  * Note that we currently don't support any address outside the KIO segment.
  31  */
  32 static inline void __iomem *ioremap_nocache(unsigned long offset,
  33                 unsigned long size)
  34 {
  35         if (offset >= XCHAL_KIO_PADDR
  36             && offset - XCHAL_KIO_PADDR < XCHAL_KIO_SIZE)
  37                 return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_BYPASS_VADDR);
  38         else
  39                 BUG();
  40 }
  41
  42 static inline void __iomem *ioremap_cache(unsigned long offset,
  43                 unsigned long size)
  44 {
  45         if (offset >= XCHAL_KIO_PADDR
  46             && offset - XCHAL_KIO_PADDR < XCHAL_KIO_SIZE)
  47                 return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_CACHED_VADDR);
  48         else
  49                 BUG();
  50 }
  51 #define ioremap_cache ioremap_cache
  52
  53 #define ioremap_wc ioremap_nocache
  54 #define ioremap_wt ioremap_nocache
  55
  56 static inline void __iomem *ioremap(unsigned long offset, unsigned long size)
  57 {
  58         return ioremap_nocache(offset, size);
  59 }
  60
  61 static inline void iounmap(volatile void __iomem *addr)
  62 {
  63 }
  64
  65 #define virt_to_bus     virt_to_phys
  66 #define bus_to_virt     phys_to_virt
  67
  68 #endif /* CONFIG_MMU */
  69
  70 #endif  /* __KERNEL__ */
  71
  72 #include <asm-generic/io.h>
  73
  74 #endif  /* _XTENSA_IO_H */