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
  65 static 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  */
  74 static inline void unmap_physmem(void *vaddr, unsigned long flags)
  75 {
  76
  77 }
  78
  79 static inline phys_addr_t virt_to_phys(void * vaddr)
  80 {
  81         return (phys_addr_t)(vaddr);
  82 }
  83
  84 #endif