arch/nios2/include/asm/io.h

   1 /*
   2  * Copyright (C) 2014 Altera Corporation
   3  * Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
   4  * Copyright (C) 2004 Microtronix Datacom Ltd.
   5  *
   6  * This file is subject to the terms and conditions of the GNU General Public
   7  * License. See the file "COPYING" in the main directory of this archive
   8  * for more details.
   9  */
  10
  11 #ifndef _ASM_NIOS2_IO_H
  12 #define _ASM_NIOS2_IO_H
  13
  14 #include <linux/types.h>
  15 #include <asm/pgtable-bits.h>
  16
  17 /* PCI is not supported in nios2, set this to 0. */
  18 #define IO_SPACE_LIMIT 0
  19
  20 #define readb_relaxed(addr)     readb(addr)
  21 #define readw_relaxed(addr)     readw(addr)
  22 #define readl_relaxed(addr)     readl(addr)
  23
  24 #define writeb_relaxed(x, addr) writeb(x, addr)
  25 #define writew_relaxed(x, addr) writew(x, addr)
  26 #define writel_relaxed(x, addr) writel(x, addr)
  27
  28 void __iomem *ioremap(unsigned long physaddr, unsigned long size);
  29 void iounmap(void __iomem *addr);
  30
  31 /* Pages to physical address... */
  32 #define page_to_phys(page)      virt_to_phys(page_to_virt(page))
  33
  34 /* Macros used for converting between virtual and physical mappings. */
  35 #define phys_to_virt(vaddr)     \
  36         ((void *)((unsigned long)(vaddr) | CONFIG_NIOS2_KERNEL_REGION_BASE))
  37 /* Clear top 3 bits */
  38 #define virt_to_phys(vaddr)     \
  39         ((unsigned long)((unsigned long)(vaddr) & ~0xE0000000))
  40
  41 #include <asm-generic/io.h>
  42
  43 #endif /* _ASM_NIOS2_IO_H */