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 extern void __iomem *__ioremap(unsigned long physaddr, unsigned long size,
  29                         unsigned long cacheflag);
  30 extern void __iounmap(void __iomem *addr);
  31
  32 static inline void __iomem *ioremap(unsigned long physaddr, unsigned long size)
  33 {
  34         return __ioremap(physaddr, size, 0);
  35 }
  36
  37 static inline void __iomem *ioremap_nocache(unsigned long physaddr,
  38                                                 unsigned long size)
  39 {
  40         return __ioremap(physaddr, size, 0);
  41 }
  42
  43 static inline void iounmap(void __iomem *addr)
  44 {
  45         __iounmap(addr);
  46 }
  47
  48 #define ioremap_wc ioremap_nocache
  49
  50 /* Pages to physical address... */
  51 #define page_to_phys(page)      virt_to_phys(page_to_virt(page))
  52 #define page_to_bus(page)       page_to_virt(page)
  53
  54 /* Macros used for converting between virtual and physical mappings. */
  55 #define phys_to_virt(vaddr)     \
  56         ((void *)((unsigned long)(vaddr) | CONFIG_NIOS2_KERNEL_REGION_BASE))
  57 /* Clear top 3 bits */
  58 #define virt_to_phys(vaddr)     \
  59         ((unsigned long)((unsigned long)(vaddr) & ~0xE0000000))
  60
  61 #include <asm-generic/io.h>
  62
  63 #endif /* _ASM_NIOS2_IO_H */