root/arch/csky/include/asm/io.h

INCLUDED FROM

   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 <asm/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 extern void __iomem *ioremap_cache(phys_addr_t addr, size_t size);
  40 extern void __iomem *__ioremap(phys_addr_t addr, size_t size, pgprot_t prot);
  41 extern void iounmap(void *addr);
  42 
  43 #define ioremap(addr, size)             __ioremap((addr), (size), pgprot_noncached(PAGE_KERNEL))
  44 #define ioremap_wc(addr, size)          __ioremap((addr), (size), pgprot_writecombine(PAGE_KERNEL))
  45 #define ioremap_nocache(addr, size)     ioremap((addr), (size))
  46 #define ioremap_cache                   ioremap_cache
  47 
  48 #include <asm-generic/io.h>
  49 
  50 #endif /* __ASM_CSKY_IO_H */