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

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