/*

   * include/asm-xtensa/io.h

   *
   * This file is subject to the terms and conditions of the GNU General Public
   * License.  See the file "COPYING" in the main directory of this archive
   * for more details.
   *
   * Copyright (C) 2001 - 2005 Tensilica Inc.
   */
  
  #ifndef _XTENSA_IO_H
  #define _XTENSA_IO_H
  
  #ifdef __KERNEL__

  #include <asm/byteorder.h>

  #include <asm/page.h>

  #include <linux/kernel.h>

  
  #include <linux/types.h>

  #define XCHAL_KIO_CACHED_VADDR	0xe0000000
  #define XCHAL_KIO_BYPASS_VADDR	0xf0000000

  #define XCHAL_KIO_PADDR		0xf0000000

  #define XCHAL_KIO_SIZE		0x10000000
  
  #define IOADDR(x)		(XCHAL_KIO_BYPASS_VADDR + (x))

  
  /*
   * swap functions to change byte order from little-endian to big-endian and
   * vice versa.
   */
  
  static inline unsigned short _swapw (unsigned short v)
  {
  	return (v << 8) | (v >> 8);
  }
  
  static inline unsigned int _swapl (unsigned int v)
  {
  	return (v << 24) | ((v & 0xff00) << 8) | ((v >> 8) & 0xff00) | (v >> 24);
  }
  
  /*
   * Change virtual addresses to physical addresses and vv.
   * These are trivial on the 1:1 Linux/Xtensa mapping
   */

  static inline unsigned long virt_to_phys(volatile void * address)

  {

  	return __pa(address);

  }

  static inline void * phys_to_virt(unsigned long address)

  {

  	return __va(address);

  }
  
  /*

   * virt_to_bus and bus_to_virt are deprecated.

   */

  #define virt_to_bus(x)	virt_to_phys(x)
  #define bus_to_virt(x)	phys_to_virt(x)

  
  /*

   * Return the virtual (cached) address for the specified bus memory.
   * Note that we currently don't support any address outside the KIO segment.

   */

  static inline void *ioremap(unsigned long offset, unsigned long size)

  {

  #ifdef CONFIG_MMU

  	if (offset >= XCHAL_KIO_PADDR
  	    && offset < XCHAL_KIO_PADDR + XCHAL_KIO_SIZE)
  		return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_BYPASS_VADDR);

  	else
  		BUG();

  #else
  	return (void *)offset;
  #endif

  }

  static inline void *ioremap_nocache(unsigned long offset, unsigned long size)

  {

  #ifdef CONFIG_MMU

  	if (offset >= XCHAL_KIO_PADDR
  	    && offset < XCHAL_KIO_PADDR + XCHAL_KIO_SIZE)
  		return (void*)(offset-XCHAL_KIO_PADDR+XCHAL_KIO_CACHED_VADDR);
  	else
  		BUG();

  #else
  	return (void *)offset;
  #endif

  }

  static inline void iounmap(void *addr)

  {
  }
  
  /*
   * Generic I/O
   */
  
  #define readb(addr) \
  	({ unsigned char __v = (*(volatile unsigned char *)(addr)); __v; })
  #define readw(addr) \
  	({ unsigned short __v = (*(volatile unsigned short *)(addr)); __v; })
  #define readl(addr) \
  	({ unsigned int __v = (*(volatile unsigned int *)(addr)); __v; })
  #define writeb(b, addr) (void)((*(volatile unsigned char *)(addr)) = (b))
  #define writew(b, addr) (void)((*(volatile unsigned short *)(addr)) = (b))
  #define writel(b, addr) (void)((*(volatile unsigned int *)(addr)) = (b))
  
  static inline __u8 __raw_readb(const volatile void __iomem *addr)
  {
            return *(__force volatile __u8 *)(addr);
  }
  static inline __u16 __raw_readw(const volatile void __iomem *addr)
  {
            return *(__force volatile __u16 *)(addr);
  }
  static inline __u32 __raw_readl(const volatile void __iomem *addr)
  {
            return *(__force volatile __u32 *)(addr);
  }
  static inline void __raw_writeb(__u8 b, volatile void __iomem *addr)
  {
            *(__force volatile __u8 *)(addr) = b;
  }
  static inline void __raw_writew(__u16 b, volatile void __iomem *addr)
  {
            *(__force volatile __u16 *)(addr) = b;
  }
  static inline void __raw_writel(__u32 b, volatile void __iomem *addr)
  {
            *(__force volatile __u32 *)(addr) = b;
  }

  /* These are the definitions for the x86 IO instructions
   * inb/inw/inl/outb/outw/outl, the "string" versions
   * insb/insw/insl/outsb/outsw/outsl, and the "pausing" versions
   * inb_p/inw_p/...
   * The macros don't do byte-swapping.
   */

  #define inb(port)		readb((u8 *)((port)))
  #define outb(val, port)		writeb((val),(u8 *)((unsigned long)(port)))
  #define inw(port)		readw((u16 *)((port)))
  #define outw(val, port)		writew((val),(u16 *)((unsigned long)(port)))
  #define inl(port)		readl((u32 *)((port)))

  #define outl(val, port)		writel((val),(u32 *)((unsigned long)(port)))
  
  #define inb_p(port)		inb((port))
  #define outb_p(val, port)	outb((val), (port))
  #define inw_p(port)		inw((port))
  #define outw_p(val, port)	outw((val), (port))
  #define inl_p(port)		inl((port))
  #define outl_p(val, port)	outl((val), (port))
  
  extern void insb (unsigned long port, void *dst, unsigned long count);
  extern void insw (unsigned long port, void *dst, unsigned long count);
  extern void insl (unsigned long port, void *dst, unsigned long count);
  extern void outsb (unsigned long port, const void *src, unsigned long count);
  extern void outsw (unsigned long port, const void *src, unsigned long count);
  extern void outsl (unsigned long port, const void *src, unsigned long count);
  
  #define IO_SPACE_LIMIT ~0
  
  #define memset_io(a,b,c)       memset((void *)(a),(b),(c))
  #define memcpy_fromio(a,b,c)   memcpy((a),(void *)(b),(c))
  #define memcpy_toio(a,b,c)      memcpy((void *)(a),(b),(c))
  
  /* At this point the Xtensa doesn't provide byte swap instructions */
  
  #ifdef __XTENSA_EB__
  # define in_8(addr) (*(u8*)(addr))
  # define in_le16(addr) _swapw(*(u16*)(addr))
  # define in_le32(addr) _swapl(*(u32*)(addr))
  # define out_8(b, addr) *(u8*)(addr) = (b)
  # define out_le16(b, addr) *(u16*)(addr) = _swapw(b)
  # define out_le32(b, addr) *(u32*)(addr) = _swapl(b)
  #elif defined(__XTENSA_EL__)
  # define in_8(addr)  (*(u8*)(addr))
  # define in_le16(addr) (*(u16*)(addr))
  # define in_le32(addr) (*(u32*)(addr))
  # define out_8(b, addr) *(u8*)(addr) = (b)
  # define out_le16(b, addr) *(u16*)(addr) = (b)
  # define out_le32(b, addr) *(u32*)(addr) = (b)
  #else
  # error processor byte order undefined!
  #endif
  
  
  /*

   * Convert a physical pointer to a virtual kernel pointer for /dev/mem access
   */

  #define xlate_dev_mem_ptr(p)    __va(p)
  
  /*

   * Convert a virtual cached pointer to an uncached pointer
   */

  #define xlate_dev_kmem_ptr(p)   p
  
  
  #endif	/* __KERNEL__ */
  
  #endif	/* _XTENSA_IO_H */