text: /* Generic I/O port emulation, based on MN10300 code
   *
   * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   * Written by David Howells (dhowells@redhat.com)
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public Licence
   * as published by the Free Software Foundation; either version
   * 2 of the Licence, or (at your option) any later version.
   */
  #ifndef __ASM_GENERIC_IO_H
  #define __ASM_GENERIC_IO_H
  
  #include <asm/page.h> /* I/O is all done through memory accesses */
  #include <asm/cacheflush.h>
  #include <linux/types.h>
  
  #ifdef CONFIG_GENERIC_IOMAP
  #include <asm-generic/iomap.h>
  #endif
  
  #include <asm-generic/pci_iomap.h>
  
  #ifndef mmiowb
  #define mmiowb() do {} while (0)
  #endif
  
  /*****************************************************************************/
  /*
   * readX/writeX() are used to access memory mapped devices. On some
   * architectures the memory mapped IO stuff needs to be accessed
   * differently. On the simple architectures, we just read/write the
   * memory location directly.
   */
  #ifndef __raw_readb
  static inline u8 __raw_readb(const volatile void __iomem *addr)
  {
  	return *(const volatile u8 __force *) addr;
  }
  #endif
  
  #ifndef __raw_readw
  static inline u16 __raw_readw(const volatile void __iomem *addr)
  {
  	return *(const volatile u16 __force *) addr;
  }
  #endif
  
  #ifndef __raw_readl
  static inline u32 __raw_readl(const volatile void __iomem *addr)
  {
  	return *(const volatile u32 __force *) addr;
  }
  #endif
  
  #define readb __raw_readb
  #define readw(addr) __le16_to_cpu(__raw_readw(addr))
  #define readl(addr) __le32_to_cpu(__raw_readl(addr))
  
  #ifndef __raw_writeb
  static inline void __raw_writeb(u8 b, volatile void __iomem *addr)
  {
  	*(volatile u8 __force *) addr = b;
  }
  #endif
  
  #ifndef __raw_writew
  static inline void __raw_writew(u16 b, volatile void __iomem *addr)
  {
  	*(volatile u16 __force *) addr = b;
  }
  #endif
  
  #ifndef __raw_writel
  static inline void __raw_writel(u32 b, volatile void __iomem *addr)
  {
  	*(volatile u32 __force *) addr = b;
  }
  #endif
  
  #define writeb __raw_writeb
  #define writew(b,addr) __raw_writew(__cpu_to_le16(b),addr)
  #define writel(b,addr) __raw_writel(__cpu_to_le32(b),addr)
  
  #ifdef CONFIG_64BIT
  static inline u64 __raw_readq(const volatile void __iomem *addr)
  {
  	return *(const volatile u64 __force *) addr;
  }
  #define readq(addr) __le64_to_cpu(__raw_readq(addr))
  
  static inline void __raw_writeq(u64 b, volatile void __iomem *addr)
  {
  	*(volatile u64 __force *) addr = b;
  }
  #define writeq(b,addr) __raw_writeq(__cpu_to_le64(b),addr)
  #endif
  
  #ifndef PCI_IOBASE
  #define PCI_IOBASE ((void __iomem *) 0)
  #endif
  
  /*****************************************************************************/
  /*
   * traditional input/output functions
   */
  
  static inline u8 inb(unsigned long addr)
  {
  	return readb(addr + PCI_IOBASE);
  }
  
  static inline u16 inw(unsigned long addr)
  {
  	return readw(addr + PCI_IOBASE);
  }
  
  static inline u32 inl(unsigned long addr)
  {
  	return readl(addr + PCI_IOBASE);
  }
  
  static inline void outb(u8 b, unsigned long addr)
  {
  	writeb(b, addr + PCI_IOBASE);
  }
  
  static inline void outw(u16 b, unsigned long addr)
  {
  	writew(b, addr + PCI_IOBASE);
  }
  
  static inline void outl(u32 b, unsigned long addr)
  {
  	writel(b, addr + PCI_IOBASE);
  }
  
  #define inb_p(addr)	inb(addr)
  #define inw_p(addr)	inw(addr)
  #define inl_p(addr)	inl(addr)
  #define outb_p(x, addr)	outb((x), (addr))
  #define outw_p(x, addr)	outw((x), (addr))
  #define outl_p(x, addr)	outl((x), (addr))
  
  #ifndef insb
  static inline void insb(unsigned long addr, void *buffer, int count)
  {
  	if (count) {
  		u8 *buf = buffer;
  		do {
  			u8 x = inb(addr);
  			*buf++ = x;
  		} while (--count);
  	}
  }
  #endif
  
  #ifndef insw
  static inline void insw(unsigned long addr, void *buffer, int count)
  {
  	if (count) {
  		u16 *buf = buffer;
  		do {
  			u16 x = inw(addr);
  			*buf++ = x;
  		} while (--count);
  	}
  }
  #endif
  
  #ifndef insl
  static inline void insl(unsigned long addr, void *buffer, int count)
  {
  	if (count) {
  		u32 *buf = buffer;
  		do {
  			u32 x = inl(addr);
  			*buf++ = x;
  		} while (--count);
  	}
  }
  #endif
  
  #ifndef outsb
  static inline void outsb(unsigned long addr, const void *buffer, int count)
  {
  	if (count) {
  		const u8 *buf = buffer;
  		do {
  			outb(*buf++, addr);
  		} while (--count);
  	}
  }
  #endif
  
  #ifndef outsw
  static inline void outsw(unsigned long addr, const void *buffer, int count)
  {
  	if (count) {
  		const u16 *buf = buffer;
  		do {
  			outw(*buf++, addr);
  		} while (--count);
  	}
  }
  #endif
  
  #ifndef outsl
  static inline void outsl(unsigned long addr, const void *buffer, int count)
  {
  	if (count) {
  		const u32 *buf = buffer;
  		do {
  			outl(*buf++, addr);
  		} while (--count);
  	}
  }
  #endif
  
  static inline void readsl(const void __iomem *addr, void *buf, int len)
  {
  	insl(addr - PCI_IOBASE, buf, len);
  }
  
  static inline void readsw(const void __iomem *addr, void *buf, int len)
  {
  	insw(addr - PCI_IOBASE, buf, len);
  }
  
  static inline void readsb(const void __iomem *addr, void *buf, int len)
  {
  	insb(addr - PCI_IOBASE, buf, len);
  }
  
  static inline void writesl(const void __iomem *addr, const void *buf, int len)
  {
  	outsl(addr - PCI_IOBASE, buf, len);
  }
  
  static inline void writesw(const void __iomem *addr, const void *buf, int len)
  {
  	outsw(addr - PCI_IOBASE, buf, len);
  }
  
  static inline void writesb(const void __iomem *addr, const void *buf, int len)
  {
  	outsb(addr - PCI_IOBASE, buf, len);
  }
  
  #ifndef CONFIG_GENERIC_IOMAP
  #define ioread8(addr)		readb(addr)
  #define ioread16(addr)		readw(addr)
  #define ioread16be(addr)	be16_to_cpu(ioread16(addr))
  #define ioread32(addr)		readl(addr)
  #define ioread32be(addr)	be32_to_cpu(ioread32(addr))
  
  #define iowrite8(v, addr)	writeb((v), (addr))
  #define iowrite16(v, addr)	writew((v), (addr))
  #define iowrite16be(v, addr)	iowrite16(be16_to_cpu(v), (addr))
  #define iowrite32(v, addr)	writel((v), (addr))
  #define iowrite32be(v, addr)	iowrite32(be32_to_cpu(v), (addr))
  
  #define ioread8_rep(p, dst, count) \
  	insb((unsigned long) (p), (dst), (count))
  #define ioread16_rep(p, dst, count) \
  	insw((unsigned long) (p), (dst), (count))
  #define ioread32_rep(p, dst, count) \
  	insl((unsigned long) (p), (dst), (count))
  
  #define iowrite8_rep(p, src, count) \
  	outsb((unsigned long) (p), (src), (count))
  #define iowrite16_rep(p, src, count) \
  	outsw((unsigned long) (p), (src), (count))
  #define iowrite32_rep(p, src, count) \
  	outsl((unsigned long) (p), (src), (count))
  #endif /* CONFIG_GENERIC_IOMAP */
  
  #ifndef IO_SPACE_LIMIT
  #define IO_SPACE_LIMIT 0xffff
  #endif
  
  #ifdef __KERNEL__
  
  #include <linux/vmalloc.h>
  #define __io_virt(x) ((void __force *) (x))
  
  #ifndef CONFIG_GENERIC_IOMAP
  struct pci_dev;
  static inline void pci_iounmap(struct pci_dev *dev, void __iomem *p)
  {
  }
  #endif /* CONFIG_GENERIC_IOMAP */
  
  /*
   * Change virtual addresses to physical addresses and vv.
   * These are pretty trivial
   */
  static inline unsigned long virt_to_phys(volatile void *address)
  {
  	return __pa((unsigned long)address);
  }
  
  static inline void *phys_to_virt(unsigned long address)
  {
  	return __va(address);
  }
  
  /*
   * Change "struct page" to physical address.
   *
   * This implementation is for the no-MMU case only... if you have an MMU
   * you'll need to provide your own definitions.
   */
  #ifndef CONFIG_MMU
  static inline void __iomem *ioremap(phys_addr_t offset, unsigned long size)
  {
  	return (void __iomem*) (unsigned long)offset;
  }
  
  #define __ioremap(offset, size, flags)	ioremap(offset, size)
  
  #ifndef ioremap_nocache
  #define ioremap_nocache ioremap
  #endif
  
  #ifndef ioremap_wc
  #define ioremap_wc ioremap_nocache
  #endif
  
  static inline void iounmap(void __iomem *addr)
  {
  }
  #endif /* CONFIG_MMU */
  
  #ifdef CONFIG_HAS_IOPORT
  #ifndef CONFIG_GENERIC_IOMAP
  static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
  {
  	return (void __iomem *) port;
  }
  
  static inline void ioport_unmap(void __iomem *p)
  {
  }
  #else /* CONFIG_GENERIC_IOMAP */
  extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
  extern void ioport_unmap(void __iomem *p);
  #endif /* CONFIG_GENERIC_IOMAP */
  #endif /* CONFIG_HAS_IOPORT */
  
  #define xlate_dev_kmem_ptr(p)	p
  #define xlate_dev_mem_ptr(p)	__va(p)
  
  #ifndef virt_to_bus
  static inline unsigned long virt_to_bus(volatile void *address)
  {
  	return ((unsigned long) address);
  }
  
  static inline void *bus_to_virt(unsigned long address)
  {
  	return (void *) address;
  }
  #endif
  
  #define memset_io(a, b, c)	memset(__io_virt(a), (b), (c))
  #define memcpy_fromio(a, b, c)	memcpy((a), __io_virt(b), (c))
  #define memcpy_toio(a, b, c)	memcpy(__io_virt(a), (b), (c))
  
  #endif /* __KERNEL__ */
  
  #endif /* __ASM_GENERIC_IO_H */
  