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 #define PCI_IOBASE              ((void __iomem *)XCHAL_KIO_BYPASS_VADDR)
  25
  26 #ifdef CONFIG_MMU
  27
  28 void __iomem *xtensa_ioremap_nocache(unsigned long addr, unsigned long size);
  29 void __iomem *xtensa_ioremap_cache(unsigned long addr, unsigned long size);
  30 void xtensa_iounmap(volatile void __iomem *addr);
  31
  32 /*
  33  * Return the virtual address for the specified bus memory.
  34  */
  35 static inline void __iomem *ioremap(unsigned long offset, 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
  55 static inline void iounmap(volatile void __iomem *addr)
  56 {
  57         unsigned long va = (unsigned long) addr;
  58
  59         if (!(va >= XCHAL_KIO_CACHED_VADDR &&
  60               va - XCHAL_KIO_CACHED_VADDR < XCHAL_KIO_SIZE) &&
  61             !(va >= XCHAL_KIO_BYPASS_VADDR &&
  62               va - XCHAL_KIO_BYPASS_VADDR < XCHAL_KIO_SIZE))
  63                 xtensa_iounmap(addr);
  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 #include <asm-generic/io.h>
  72
  73 #endif  /* _XTENSA_IO_H */