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

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_IO_64_NONATOMIC_HI_LO_H_
   3 #define _LINUX_IO_64_NONATOMIC_HI_LO_H_
   4
   5 #include <linux/io.h>
   6 #include <asm-generic/int-ll64.h>
   7
   8 static inline __u64 hi_lo_readq(const volatile void __iomem *addr)
   9 {
  10         const volatile u32 __iomem *p = addr;
  11         u32 low, high;
  12
  13         high = readl(p + 1);
  14         low = readl(p);
  15
  16         return low + ((u64)high << 32);
  17 }
  18
  19 static inline void hi_lo_writeq(__u64 val, volatile void __iomem *addr)
  20 {
  21         writel(val >> 32, addr + 4);
  22         writel(val, addr);
  23 }
  24
  25 static inline __u64 hi_lo_readq_relaxed(const volatile void __iomem *addr)
  26 {
  27         const volatile u32 __iomem *p = addr;
  28         u32 low, high;
  29
  30         high = readl_relaxed(p + 1);
  31         low = readl_relaxed(p);
  32
  33         return low + ((u64)high << 32);
  34 }
  35
  36 static inline void hi_lo_writeq_relaxed(__u64 val, volatile void __iomem *addr)
  37 {
  38         writel_relaxed(val >> 32, addr + 4);
  39         writel_relaxed(val, addr);
  40 }
  41
  42 #ifndef readq
  43 #define readq hi_lo_readq
  44 #endif
  45
  46 #ifndef writeq
  47 #define writeq hi_lo_writeq
  48 #endif
  49
  50 #ifndef readq_relaxed
  51 #define readq_relaxed hi_lo_readq_relaxed
  52 #endif
  53
  54 #ifndef writeq_relaxed
  55 #define writeq_relaxed hi_lo_writeq_relaxed
  56 #endif
  57
  58 #endif  /* _LINUX_IO_64_NONATOMIC_HI_LO_H_ */