LXR linux/arch/csky/include/asm/io.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
   3
   4#ifndef __ASM_CSKY_IO_H
   5#define __ASM_CSKY_IO_H
   6
   7#include <linux/pgtable.h>
   8#include <linux/types.h>
   9#include <linux/version.h>
  10
  11/*
  12 * I/O memory access primitives. Reads are ordered relative to any
  13 * following Normal memory access. Writes are ordered relative to any prior
  14 * Normal memory access.
  15 *
  16 * For CACHEV1 (807, 810), store instruction could fast retire, so we need
  17 * another mb() to prevent st fast retire.
  18 *
  19 * For CACHEV2 (860), store instruction with PAGE_ATTR_NO_BUFFERABLE won't
  20 * fast retire.
  21 */
  22#define readb(c)                ({ u8  __v = readb_relaxed(c); rmb(); __v; })
  23#define readw(c)                ({ u16 __v = readw_relaxed(c); rmb(); __v; })
  24#define readl(c)                ({ u32 __v = readl_relaxed(c); rmb(); __v; })
  25
  26#ifdef CONFIG_CPU_HAS_CACHEV2
  27#define writeb(v,c)             ({ wmb(); writeb_relaxed((v),(c)); })
  28#define writew(v,c)             ({ wmb(); writew_relaxed((v),(c)); })
  29#define writel(v,c)             ({ wmb(); writel_relaxed((v),(c)); })
  30#else
  31#define writeb(v,c)             ({ wmb(); writeb_relaxed((v),(c)); mb(); })
  32#define writew(v,c)             ({ wmb(); writew_relaxed((v),(c)); mb(); })
  33#define writel(v,c)             ({ wmb(); writel_relaxed((v),(c)); mb(); })
  34#endif
  35
  36/*
  37 * I/O memory mapping functions.
  38 */
  39#define ioremap_wc(addr, size) \
  40        ioremap_prot((addr), (size), \
  41                (_PAGE_IOREMAP & ~_CACHE_MASK) | _CACHE_UNCACHED)
  42
  43#include <asm-generic/io.h>
  44
  45#endif /* __ASM_CSKY_IO_H */
  46