LXR linux/arch/unicore32/include/asm/io.h

   1/*
   2 * linux/arch/unicore32/include/asm/io.h
   3 *
   4 * Code specific to PKUnity SoC and UniCore ISA
   5 *
   6 * Copyright (C) 2001-2010 GUAN Xue-tao
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License version 2 as
  10 * published by the Free Software Foundation.
  11 */
  12#ifndef __UNICORE_IO_H__
  13#define __UNICORE_IO_H__
  14
  15#ifdef __KERNEL__
  16
  17#include <asm/byteorder.h>
  18#include <asm/memory.h>
  19
  20#define PCI_IOBASE      PKUNITY_PCILIO_BASE
  21#include <asm-generic/io.h>
  22
  23/*
  24 * __uc32_ioremap and __uc32_ioremap_cached takes CPU physical address.
  25 */
  26extern void __iomem *__uc32_ioremap(unsigned long, size_t);
  27extern void __iomem *__uc32_ioremap_cached(unsigned long, size_t);
  28extern void __uc32_iounmap(volatile void __iomem *addr);
  29
  30/*
  31 * ioremap and friends.
  32 *
  33 * ioremap takes a PCI memory address, as specified in
  34 * Documentation/io-mapping.txt.
  35 *
  36 */
  37#define ioremap(cookie, size)           __uc32_ioremap(cookie, size)
  38#define ioremap_cached(cookie, size)    __uc32_ioremap_cached(cookie, size)
  39#define ioremap_nocache(cookie, size)   __uc32_ioremap(cookie, size)
  40#define iounmap(cookie)                 __uc32_iounmap(cookie)
  41
  42#define readb_relaxed readb
  43#define readw_relaxed readw
  44#define readl_relaxed readl
  45
  46#define HAVE_ARCH_PIO_SIZE
  47#define PIO_OFFSET              (unsigned int)(PCI_IOBASE)
  48#define PIO_MASK                (unsigned int)(IO_SPACE_LIMIT)
  49#define PIO_RESERVED            (PIO_OFFSET + PIO_MASK + 1)
  50
  51#ifdef CONFIG_STRICT_DEVMEM
  52
  53#include <linux/ioport.h>
  54#include <linux/mm.h>
  55
  56/*
  57 * devmem_is_allowed() checks to see if /dev/mem access to a certain
  58 * address is valid. The argument is a physical page number.
  59 * We mimic x86 here by disallowing access to system RAM as well as
  60 * device-exclusive MMIO regions. This effectively disable read()/write()
  61 * on /dev/mem.
  62 */
  63static inline int devmem_is_allowed(unsigned long pfn)
  64{
  65        if (iomem_is_exclusive(pfn << PAGE_SHIFT))
  66                return 0;
  67        if (!page_is_ram(pfn))
  68                return 1;
  69        return 0;
  70}
  71
  72#endif /* CONFIG_STRICT_DEVMEM */
  73
  74#endif  /* __KERNEL__ */
  75#endif  /* __UNICORE_IO_H__ */
  76