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
  25 #ifdef CONFIG_MMU
  26
  27 void __iomem *xtensa_ioremap_nocache(unsigned long addr, unsigned long size);
  28 void __iomem *xtensa_ioremap_cache(unsigned long addr, unsigned long size);
  29 void xtensa_iounmap(volatile void __iomem *addr);
  30
  31 /*
  32  * Return the virtual address for the specified bus memory.
  33  */
  34 static inline void __iomem *ioremap_nocache(unsigned long offset,
  35                 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
  44 static 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 #define ioremap_nocache ioremap_nocache
  55
  56 #define ioremap_wc ioremap_nocache
  57 #define ioremap_wt ioremap_nocache
  58
  59 static inline void __iomem *ioremap(unsigned long offset, unsigned long size)
  60 {
  61         return ioremap_nocache(offset, size);
  62 }
  63
  64 static 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 #include <asm-generic/io.h>
  81
  82 #endif  /* _XTENSA_IO_H */