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
hi_lo_readq(const volatile void __iomem * addr)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
hi_lo_writeq(__u64 val,volatile void __iomem * addr)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
hi_lo_readq_relaxed(const volatile void __iomem * addr)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
hi_lo_writeq_relaxed(__u64 val,volatile void __iomem * addr)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_ */
59