/*
   * Implement the default iomap interfaces
   *
   * (C) Copyright 2004 Linus Torvalds
   */
  #include <linux/pci.h>
  #include <linux/io.h>
  
  #include <linux/export.h>
  
  /*
   * Read/write from/to an (offsettable) iomem cookie. It might be a PIO
   * access or a MMIO access, these functions don't care. The info is
   * encoded in the hardware mapping set up by the mapping functions
   * (or the cookie itself, depending on implementation and hw).
   *
   * The generic routines don't assume any hardware mappings, and just
   * encode the PIO/MMIO as part of the cookie. They coldly assume that
   * the MMIO IO mappings are not in the low address range.
   *
   * Architectures for which this is not true can't use this generic
   * implementation and should do their own copy.
   */
  
  #ifndef HAVE_ARCH_PIO_SIZE
  /*
   * We encode the physical PIO addresses (0-0xffff) into the
   * pointer by offsetting them with a constant (0x10000) and
   * assuming that all the low addresses are always PIO. That means
   * we can do some sanity checks on the low bits, and don't
   * need to just take things for granted.
   */
  #define PIO_OFFSET	0x10000UL
  #define PIO_MASK	0x0ffffUL
  #define PIO_RESERVED	0x40000UL
  #endif
  
  static void bad_io_access(unsigned long port, const char *access)
  {
  	static int count = 10;
  	if (count) {
  		count--;
  		WARN(1, KERN_ERR "Bad IO access at port %#lx (%s)
  ", port, access);
  	}
  }
  
  /*
   * Ugly macros are a way of life.
   */
  #define IO_COND(addr, is_pio, is_mmio) do {			\
  	unsigned long port = (unsigned long __force)addr;	\
  	if (port >= PIO_RESERVED) {				\
  		is_mmio;					\
  	} else if (port > PIO_OFFSET) {				\
  		port &= PIO_MASK;				\
  		is_pio;						\
  	} else							\
  		bad_io_access(port, #is_pio );			\
  } while (0)
  
  #ifndef pio_read16be
  #define pio_read16be(port) swab16(inw(port))
  #define pio_read32be(port) swab32(inl(port))
  #endif
  
  #ifndef mmio_read16be
  #define mmio_read16be(addr) be16_to_cpu(__raw_readw(addr))
  #define mmio_read32be(addr) be32_to_cpu(__raw_readl(addr))
  #endif
  
  unsigned int ioread8(void __iomem *addr)
  {
  	IO_COND(addr, return inb(port), return readb(addr));
  	return 0xff;
  }
  unsigned int ioread16(void __iomem *addr)
  {
  	IO_COND(addr, return inw(port), return readw(addr));
  	return 0xffff;
  }
  unsigned int ioread16be(void __iomem *addr)
  {
  	IO_COND(addr, return pio_read16be(port), return mmio_read16be(addr));
  	return 0xffff;
  }
  unsigned int ioread32(void __iomem *addr)
  {
  	IO_COND(addr, return inl(port), return readl(addr));
  	return 0xffffffff;
  }
  unsigned int ioread32be(void __iomem *addr)
  {
  	IO_COND(addr, return pio_read32be(port), return mmio_read32be(addr));
  	return 0xffffffff;
  }
  EXPORT_SYMBOL(ioread8);
  EXPORT_SYMBOL(ioread16);
  EXPORT_SYMBOL(ioread16be);
  EXPORT_SYMBOL(ioread32);
  EXPORT_SYMBOL(ioread32be);
  
  #ifndef pio_write16be
  #define pio_write16be(val,port) outw(swab16(val),port)
  #define pio_write32be(val,port) outl(swab32(val),port)
  #endif
  
  #ifndef mmio_write16be
  #define mmio_write16be(val,port) __raw_writew(be16_to_cpu(val),port)
  #define mmio_write32be(val,port) __raw_writel(be32_to_cpu(val),port)
  #endif
  
  void iowrite8(u8 val, void __iomem *addr)
  {
  	IO_COND(addr, outb(val,port), writeb(val, addr));
  }
  void iowrite16(u16 val, void __iomem *addr)
  {
  	IO_COND(addr, outw(val,port), writew(val, addr));
  }
  void iowrite16be(u16 val, void __iomem *addr)
  {
  	IO_COND(addr, pio_write16be(val,port), mmio_write16be(val, addr));
  }
  void iowrite32(u32 val, void __iomem *addr)
  {
  	IO_COND(addr, outl(val,port), writel(val, addr));
  }
  void iowrite32be(u32 val, void __iomem *addr)
  {
  	IO_COND(addr, pio_write32be(val,port), mmio_write32be(val, addr));
  }
  EXPORT_SYMBOL(iowrite8);
  EXPORT_SYMBOL(iowrite16);
  EXPORT_SYMBOL(iowrite16be);
  EXPORT_SYMBOL(iowrite32);
  EXPORT_SYMBOL(iowrite32be);
  
  /*
   * These are the "repeat MMIO read/write" functions.
   * Note the "__raw" accesses, since we don't want to
   * convert to CPU byte order. We write in "IO byte
   * order" (we also don't have IO barriers).
   */
  #ifndef mmio_insb
  static inline void mmio_insb(void __iomem *addr, u8 *dst, int count)
  {
  	while (--count >= 0) {
  		u8 data = __raw_readb(addr);
  		*dst = data;
  		dst++;
  	}
  }
  static inline void mmio_insw(void __iomem *addr, u16 *dst, int count)
  {
  	while (--count >= 0) {
  		u16 data = __raw_readw(addr);
  		*dst = data;
  		dst++;
  	}
  }
  static inline void mmio_insl(void __iomem *addr, u32 *dst, int count)
  {
  	while (--count >= 0) {
  		u32 data = __raw_readl(addr);
  		*dst = data;
  		dst++;
  	}
  }
  #endif
  
  #ifndef mmio_outsb
  static inline void mmio_outsb(void __iomem *addr, const u8 *src, int count)
  {
  	while (--count >= 0) {
  		__raw_writeb(*src, addr);
  		src++;
  	}
  }
  static inline void mmio_outsw(void __iomem *addr, const u16 *src, int count)
  {
  	while (--count >= 0) {
  		__raw_writew(*src, addr);
  		src++;
  	}
  }
  static inline void mmio_outsl(void __iomem *addr, const u32 *src, int count)
  {
  	while (--count >= 0) {
  		__raw_writel(*src, addr);
  		src++;
  	}
  }
  #endif
  
  void ioread8_rep(void __iomem *addr, void *dst, unsigned long count)
  {
  	IO_COND(addr, insb(port,dst,count), mmio_insb(addr, dst, count));
  }
  void ioread16_rep(void __iomem *addr, void *dst, unsigned long count)
  {
  	IO_COND(addr, insw(port,dst,count), mmio_insw(addr, dst, count));
  }
  void ioread32_rep(void __iomem *addr, void *dst, unsigned long count)
  {
  	IO_COND(addr, insl(port,dst,count), mmio_insl(addr, dst, count));
  }
  EXPORT_SYMBOL(ioread8_rep);
  EXPORT_SYMBOL(ioread16_rep);
  EXPORT_SYMBOL(ioread32_rep);
  
  void iowrite8_rep(void __iomem *addr, const void *src, unsigned long count)
  {
  	IO_COND(addr, outsb(port, src, count), mmio_outsb(addr, src, count));
  }
  void iowrite16_rep(void __iomem *addr, const void *src, unsigned long count)
  {
  	IO_COND(addr, outsw(port, src, count), mmio_outsw(addr, src, count));
  }
  void iowrite32_rep(void __iomem *addr, const void *src, unsigned long count)
  {
  	IO_COND(addr, outsl(port, src,count), mmio_outsl(addr, src, count));
  }
  EXPORT_SYMBOL(iowrite8_rep);
  EXPORT_SYMBOL(iowrite16_rep);
  EXPORT_SYMBOL(iowrite32_rep);
  
  #ifdef CONFIG_HAS_IOPORT
  /* Create a virtual mapping cookie for an IO port range */
  void __iomem *ioport_map(unsigned long port, unsigned int nr)
  {
  	if (port > PIO_MASK)
  		return NULL;
  	return (void __iomem *) (unsigned long) (port + PIO_OFFSET);
  }
  
  void ioport_unmap(void __iomem *addr)
  {
  	/* Nothing to do */
  }
  EXPORT_SYMBOL(ioport_map);
  EXPORT_SYMBOL(ioport_unmap);
  #endif /* CONFIG_HAS_IOPORT */
  
  #ifdef CONFIG_PCI
  /* Hide the details if this is a MMIO or PIO address space and just do what
   * you expect in the correct way. */
  void pci_iounmap(struct pci_dev *dev, void __iomem * addr)
  {
  	IO_COND(addr, /* nothing */, iounmap(addr));
  }
  EXPORT_SYMBOL(pci_iounmap);
  #endif /* CONFIG_PCI */