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  */
  26 extern void __iomem *__uc32_ioremap(unsigned long, size_t);
  27 extern void __iomem *__uc32_ioremap_cached(unsigned long, size_t);
  28 extern 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  */
  63 static 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__ */