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 */