LXR uboot/arch/sparc/include/asm/io.h

   1/* SPARC I/O definitions
   2 *
   3 * (C) Copyright 2007
   4 * Daniel Hellstrom, Gaisler Research, daniel@gaisler.com.
   5 *
   6 * SPDX-License-Identifier:     GPL-2.0+
   7 */
   8
   9#ifndef _SPARC_IO_H
  10#define _SPARC_IO_H
  11
  12/* Nothing to sync, total store ordering (TSO)... */
  13#define sync()
  14
  15/* Forces a cache miss on read/load.
  16 * On some architectures we need to bypass the cache when reading
  17 * I/O registers so that we are not reading the same status word
  18 * over and over again resulting in a hang (until an IRQ if lucky)
  19 *
  20 */
  21#ifndef CONFIG_SYS_HAS_NO_CACHE
  22#define READ_BYTE(var)  SPARC_NOCACHE_READ_BYTE((unsigned int)(var))
  23#define READ_HWORD(var) SPARC_NOCACHE_READ_HWORD((unsigned int)(var))
  24#define READ_WORD(var)  SPARC_NOCACHE_READ((unsigned int)(var))
  25#define READ_DWORD(var) SPARC_NOCACHE_READ_DWORD((unsigned int)(var))
  26#else
  27#define READ_BYTE(var)  (var)
  28#define READ_HWORD(var) (var)
  29#define READ_WORD(var)  (var)
  30#define READ_DWORD(var) (var)
  31#endif
  32
  33/*
  34 * Generic virtual read/write.
  35 */
  36#define __arch_getb(a)                  (READ_BYTE(a))
  37#define __arch_getw(a)                  (READ_HWORD(a))
  38#define __arch_getl(a)                  (READ_WORD(a))
  39#define __arch_getq(a)                  (READ_DWORD(a))
  40
  41#define __arch_putb(v,a)                (*(volatile unsigned char *)(a) = (v))
  42#define __arch_putw(v,a)                (*(volatile unsigned short *)(a) = (v))
  43#define __arch_putl(v,a)                (*(volatile unsigned int *)(a) = (v))
  44
  45#define __raw_writeb(v,a)               __arch_putb(v,a)
  46#define __raw_writew(v,a)               __arch_putw(v,a)
  47#define __raw_writel(v,a)               __arch_putl(v,a)
  48
  49#define __raw_readb(a)                  __arch_getb(a)
  50#define __raw_readw(a)                  __arch_getw(a)
  51#define __raw_readl(a)                  __arch_getl(a)
  52#define __raw_readq(a)                  __arch_getq(a)
  53
  54/*
  55 * Given a physical address and a length, return a virtual address
  56 * that can be used to access the memory range with the caching
  57 * properties specified by "flags".
  58 */
  59
  60#define MAP_NOCACHE     (0)
  61#define MAP_WRCOMBINE   (0)
  62#define MAP_WRBACK      (0)
  63#define MAP_WRTHROUGH   (0)
  64
  65static inline void *map_physmem(phys_addr_t paddr, unsigned long len,
  66                                unsigned long flags)
  67{
  68        return (void *)paddr;
  69}
  70
  71/*
  72 * Take down a mapping set up by map_physmem().
  73 */
  74static inline void unmap_physmem(void *vaddr, unsigned long flags)
  75{
  76
  77}
  78
  79static inline phys_addr_t virt_to_phys(void * vaddr)
  80{
  81        return (phys_addr_t)(vaddr);
  82}
  83
  84#endif
  85