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 #if XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY && defined(CONFIG_OF)
  29 extern unsigned long xtensa_kio_paddr;
  30
  31 static inline unsigned long xtensa_get_kio_paddr(void)
  32 {
  33         return xtensa_kio_paddr;
  34 }
  35 #endif
  36
  37 /*
  38  * Return the virtual address for the specified bus memory.
  39  * Note that we currently don't support any address outside the KIO segment.
  40  */
  41 static inline void __iomem *ioremap_nocache(unsigned long offset,
  42                 unsigned long size)
  43 {
  44         if (offset >= XCHAL_KIO_PADDR
  45             && offset - XCHAL_KIO_PADDR < XCHAL_KIO_SIZE)
  46                 return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_BYPASS_VADDR);
  47         else
  48                 BUG();
  49 }
  50
  51 static inline void __iomem *ioremap_cache(unsigned long offset,
  52                 unsigned long size)
  53 {
  54         if (offset >= XCHAL_KIO_PADDR
  55             && offset - XCHAL_KIO_PADDR < XCHAL_KIO_SIZE)
  56                 return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_CACHED_VADDR);
  57         else
  58                 BUG();
  59 }
  60
  61 #define ioremap_wc ioremap_nocache
  62
  63 static inline void __iomem *ioremap(unsigned long offset, unsigned long size)
  64 {
  65         return ioremap_nocache(offset, size);
  66 }
  67
  68 static inline void iounmap(volatile void __iomem *addr)
  69 {
  70 }
  71
  72 #define virt_to_bus     virt_to_phys
  73 #define bus_to_virt     phys_to_virt
  74
  75 #endif /* CONFIG_MMU */
  76
  77 /*
  78  * Generic I/O
  79  */
  80 #define readb_relaxed readb
  81 #define readw_relaxed readw
  82 #define readl_relaxed readl
  83
  84 #endif  /* __KERNEL__ */
  85
  86 #include <asm-generic/io.h>
  87
  88 #endif  /* _XTENSA_IO_H */