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
   7 static 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
  18 static inline void hi_lo_writeq(__u64 val, volatile void __iomem *addr)
  19 {
  20         writel(val >> 32, addr + 4);
  21         writel(val, addr);
  22 }
  23
  24 static 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
  35 static 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_ */