arch/sandbox/include/asm/io.h

   1 /*
   2  * Copyright (c) 2011 The Chromium OS Authors.
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #ifndef __SANDBOX_ASM_IO_H
   8 #define __SANDBOX_ASM_IO_H
   9
  10 /*
  11  * Given a physical address and a length, return a virtual address
  12  * that can be used to access the memory range with the caching
  13  * properties specified by "flags".
  14  */
  15 #define MAP_NOCACHE     (0)
  16 #define MAP_WRCOMBINE   (0)
  17 #define MAP_WRBACK      (0)
  18 #define MAP_WRTHROUGH   (0)
  19
  20 void *map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags);
  21
  22 /*
  23  * Take down a mapping set up by map_physmem().
  24  */
  25 void unmap_physmem(const void *vaddr, unsigned long flags);
  26
  27 /* For sandbox, we want addresses to point into our RAM buffer */
  28 static inline void *map_sysmem(phys_addr_t paddr, unsigned long len)
  29 {
  30         return map_physmem(paddr, len, MAP_WRBACK);
  31 }
  32
  33 /* Remove a previous mapping */
  34 static inline void unmap_sysmem(const void *vaddr)
  35 {
  36         unmap_physmem(vaddr, MAP_WRBACK);
  37 }
  38
  39 /* Map from a pointer to our RAM buffer */
  40 phys_addr_t map_to_sysmem(const void *ptr);
  41
  42 /* Define nops for sandbox I/O access */
  43 #define readb(addr) 0
  44 #define readw(addr) 0
  45 #define readl(addr) 0
  46 #define writeb(v, addr)
  47 #define writew(v, addr)
  48 #define writel(v, addr)
  49
  50 /* I/O access functions */
  51 int inl(unsigned int addr);
  52 int inw(unsigned int addr);
  53 int inb(unsigned int addr);
  54
  55 void outl(unsigned int value, unsigned int addr);
  56 void outw(unsigned int value, unsigned int addr);
  57 void outb(unsigned int value, unsigned int addr);
  58
  59 #include <iotrace.h>
  60
  61 #endif