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

   1/*
   2 * IO header file
   3 *
   4 * Copyright (C) 2001-2007 Tensilica Inc.
   5 * Based on the Linux/Xtensa version of this header.
   6 *
   7 * SPDX-License-Identifier:     GPL-2.0+
   8 */
   9
  10#ifndef _XTENSA_IO_H
  11#define _XTENSA_IO_H
  12
  13#include <linux/types.h>
  14#include <asm/byteorder.h>
  15
  16/*
  17 * swap functions to change byte order from little-endian to big-endian and
  18 * vice versa.
  19 */
  20
  21static inline unsigned short _swapw(unsigned short v)
  22{
  23        return (v << 8) | (v >> 8);
  24}
  25
  26static inline unsigned int _swapl(unsigned int v)
  27{
  28        return (v << 24) | ((v & 0xff00) << 8) |
  29                ((v >> 8) & 0xff00) | (v >> 24);
  30}
  31
  32/*
  33 * Generic I/O
  34 */
  35
  36#define readb(addr) \
  37        ({ unsigned char __v = (*(volatile unsigned char *)(addr)); __v; })
  38#define readw(addr) \
  39        ({ unsigned short __v = (*(volatile unsigned short *)(addr)); __v; })
  40#define readl(addr) \
  41        ({ unsigned int __v = (*(volatile unsigned int *)(addr)); __v; })
  42#define writeb(b, addr) (void)((*(volatile unsigned char *)(addr)) = (b))
  43#define writew(b, addr) (void)((*(volatile unsigned short *)(addr)) = (b))
  44#define writel(b, addr) (void)((*(volatile unsigned int *)(addr)) = (b))
  45
  46#define __raw_readb readb
  47#define __raw_readw readw
  48#define __raw_readl readl
  49#define __raw_writeb writeb
  50#define __raw_writew writew
  51#define __raw_writel writel
  52
  53/* These are the definitions for the x86 IO instructions
  54 * inb/inw/inl/outb/outw/outl, the "string" versions
  55 * insb/insw/insl/outsb/outsw/outsl, and the "pausing" versions
  56 * inb_p/inw_p/...
  57 * The macros don't do byte-swapping.
  58 */
  59
  60#define inb(port)               readb((u8 *)((port)))
  61#define outb(val, port)         writeb((val), (u8 *)((unsigned long)(port)))
  62#define inw(port)               readw((u16 *)((port)))
  63#define outw(val, port)         writew((val), (u16 *)((unsigned long)(port)))
  64#define inl(port)               readl((u32 *)((port)))
  65#define outl(val, port)         writel((val), (u32 *)((unsigned long)(port)))
  66
  67#define inb_p(port)             inb((port))
  68#define outb_p(val, port)       outb((val), (port))
  69#define inw_p(port)             inw((port))
  70#define outw_p(val, port)       outw((val), (port))
  71#define inl_p(port)             inl((port))
  72#define outl_p(val, port)       outl((val), (port))
  73
  74void insb(unsigned long port, void *dst, unsigned long count);
  75void insw(unsigned long port, void *dst, unsigned long count);
  76void insl(unsigned long port, void *dst, unsigned long count);
  77void outsb(unsigned long port, const void *src, unsigned long count);
  78void outsw(unsigned long port, const void *src, unsigned long count);
  79void outsl(unsigned long port, const void *src, unsigned long count);
  80
  81#define IO_SPACE_LIMIT ~0
  82
  83#define memset_io(a, b, c)      memset((void *)(a), (b), (c))
  84#define memcpy_fromio(a, b, c)  memcpy((a), (void *)(b), (c))
  85#define memcpy_toio(a, b, c)    memcpy((void *)(a), (b), (c))
  86
  87/* At this point the Xtensa doesn't provide byte swap instructions */
  88
  89#ifdef __XTENSA_EB__
  90# define in_8(addr) (*(u8 *)(addr))
  91# define in_le16(addr) _swapw(*(u16 *)(addr))
  92# define in_le32(addr) _swapl(*(u32 *)(addr))
  93# define out_8(b, addr) *(u8 *)(addr) = (b)
  94# define out_le16(b, addr) *(u16 *)(addr) = _swapw(b)
  95# define out_le32(b, addr) *(u32 *)(addr) = _swapl(b)
  96#elif defined(__XTENSA_EL__)
  97# define in_8(addr)  (*(u8 *)(addr))
  98# define in_le16(addr) (*(u16 *)(addr))
  99# define in_le32(addr) (*(u32 *)(addr))
 100# define out_8(b, addr) *(u8 *)(addr) = (b)
 101# define out_le16(b, addr) *(u16 *)(addr) = (b)
 102# define out_le32(b, addr) *(u32 *)(addr) = (b)
 103#else
 104# error processor byte order undefined!
 105#endif
 106
 107
 108/*
 109 * Convert a physical pointer to a virtual kernel pointer for /dev/mem access
 110 */
 111#define xlate_dev_mem_ptr(p)    __va(p)
 112
 113/*
 114 * Convert a virtual cached pointer to an uncached pointer
 115 */
 116#define xlate_dev_kmem_ptr(p)   p
 117
 118#define MAP_NOCACHE     (0)
 119#define MAP_WRCOMBINE   (0)
 120#define MAP_WRBACK      (0)
 121#define MAP_WRTHROUGH   (0)
 122
 123static inline void *
 124map_physmem(phys_addr_t paddr, unsigned long len, unsigned long flags)
 125{
 126        return (void *)paddr;
 127}
 128
 129/*
 130 * Take down a mapping set up by map_physmem().
 131 */
 132static inline void unmap_physmem(void *vaddr, unsigned long flags)
 133{
 134}
 135
 136static inline phys_addr_t virt_to_phys(void *vaddr)
 137{
 138        return (phys_addr_t)((unsigned long)vaddr);
 139}
 140
 141/*
 142 * Dummy function to keep U-Boot's cfi_flash.c driver happy.
 143 */
 144static inline void sync(void)
 145{
 146}
 147
 148#endif  /* _XTENSA_IO_H */
 149