arch/arm/mach-davinci/io.c

   1 /*
   2  * DaVinci I/O mapping code
   3  *
   4  * Copyright (C) 2005-2006 Texas Instruments
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/module.h>
  12 #include <linux/io.h>
  13
  14 #include <asm/tlb.h>
  15
  16 #define BETWEEN(p, st, sz)      ((p) >= (st) && (p) < ((st) + (sz)))
  17 #define XLATE(p, pst, vst)      ((void __iomem *)((p) - (pst) + (vst)))
  18
  19 /*
  20  * Intercept ioremap() requests for addresses in our fixed mapping regions.
  21  */
  22 void __iomem *davinci_ioremap(unsigned long p, size_t size, unsigned int type)
  23 {
  24         if (BETWEEN(p, IO_PHYS, IO_SIZE))
  25                 return XLATE(p, IO_PHYS, IO_VIRT);
  26
  27         return __arm_ioremap(p, size, type);
  28 }
  29 EXPORT_SYMBOL(davinci_ioremap);
  30
  31 void davinci_iounmap(volatile void __iomem *addr)
  32 {
  33         unsigned long virt = (unsigned long)addr;
  34
  35         if (virt >= VMALLOC_START && virt < VMALLOC_END)
  36                 __iounmap(addr);
  37 }
  38 EXPORT_SYMBOL(davinci_iounmap);