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  */
  35 static 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
  45 static 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
  57 static inline void __iomem *ioremap(unsigned long offset, unsigned long size)
  58 {
  59         return ioremap_nocache(offset, size);
  60 }
  61
  62 static 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 */