LXR linux/include/linux/io-64-nonatomic-hi-lo.h

   1#ifndef _LINUX_IO_64_NONATOMIC_HI_LO_H_
   2#define _LINUX_IO_64_NONATOMIC_HI_LO_H_
   3
   4#include <linux/io.h>
   5#include <asm-generic/int-ll64.h>
   6
   7static inline __u64 hi_lo_readq(const volatile void __iomem *addr)
   8{
   9        const volatile u32 __iomem *p = addr;
  10        u32 low, high;
  11
  12        high = readl(p + 1);
  13        low = readl(p);
  14
  15        return low + ((u64)high << 32);
  16}
  17
  18static inline void hi_lo_writeq(__u64 val, volatile void __iomem *addr)
  19{
  20        writel(val >> 32, addr + 4);
  21        writel(val, addr);
  22}
  23
  24static inline __u64 hi_lo_readq_relaxed(const volatile void __iomem *addr)
  25{
  26        const volatile u32 __iomem *p = addr;
  27        u32 low, high;
  28
  29        high = readl_relaxed(p + 1);
  30        low = readl_relaxed(p);
  31
  32        return low + ((u64)high << 32);
  33}
  34
  35static inline void hi_lo_writeq_relaxed(__u64 val, volatile void __iomem *addr)
  36{
  37        writel_relaxed(val >> 32, addr + 4);
  38        writel_relaxed(val, addr);
  39}
  40
  41#ifndef readq
  42#define readq hi_lo_readq
  43#endif
  44
  45#ifndef writeq
  46#define writeq hi_lo_writeq
  47#endif
  48
  49#ifndef readq_relaxed
  50#define readq_relaxed hi_lo_readq_relaxed
  51#endif
  52
  53#ifndef writeq_relaxed
  54#define writeq_relaxed hi_lo_writeq_relaxed
  55#endif
  56
  57#endif  /* _LINUX_IO_64_NONATOMIC_HI_LO_H_ */
  58