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Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef __ASM_SH_ATOMIC_H |
3 | #define __ASM_SH_ATOMIC_H | |
4 | ||
2b47d54e RF |
5 | #if defined(CONFIG_CPU_J2) |
6 | ||
7 | #include <asm-generic/atomic.h> | |
8 | ||
9 | #else | |
10 | ||
1da177e4 LT |
11 | /* |
12 | * Atomic operations that C can't guarantee us. Useful for | |
13 | * resource counting etc.. | |
14 | * | |
15 | */ | |
16 | ||
ea435467 MW |
17 | #include <linux/compiler.h> |
18 | #include <linux/types.h> | |
e839ca52 | 19 | #include <asm/cmpxchg.h> |
603228bc | 20 | #include <asm/barrier.h> |
1da177e4 | 21 | |
ec2ccd88 | 22 | #define ATOMIC_INIT(i) { (i) } |
1da177e4 | 23 | |
62e8a325 PZ |
24 | #define atomic_read(v) READ_ONCE((v)->counter) |
25 | #define atomic_set(v,i) WRITE_ONCE((v)->counter, (i)) | |
1da177e4 | 26 | |
1efe4ce3 SM |
27 | #if defined(CONFIG_GUSA_RB) |
28 | #include <asm/atomic-grb.h> | |
29 | #elif defined(CONFIG_CPU_SH4A) | |
ec723fbe | 30 | #include <asm/atomic-llsc.h> |
781125ca | 31 | #else |
ec723fbe | 32 | #include <asm/atomic-irq.h> |
781125ca | 33 | #endif |
1da177e4 LT |
34 | |
35 | #define atomic_add_negative(a, v) (atomic_add_return((a), (v)) < 0) | |
8c0b8139 PM |
36 | #define atomic_dec_return(v) atomic_sub_return(1, (v)) |
37 | #define atomic_inc_return(v) atomic_add_return(1, (v)) | |
38 | #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) | |
39 | #define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0) | |
40 | #define atomic_dec_and_test(v) (atomic_sub_return(1, (v)) == 0) | |
1da177e4 | 41 | |
8c0b8139 PM |
42 | #define atomic_inc(v) atomic_add(1, (v)) |
43 | #define atomic_dec(v) atomic_sub(1, (v)) | |
1da177e4 | 44 | |
8c0b8139 PM |
45 | #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) |
46 | #define atomic_cmpxchg(v, o, n) (cmpxchg(&((v)->counter), (o), (n))) | |
47 | ||
48 | /** | |
f24219b4 | 49 | * __atomic_add_unless - add unless the number is a given value |
1da177e4 | 50 | * @v: pointer of type atomic_t |
8c0b8139 PM |
51 | * @a: the amount to add to v... |
52 | * @u: ...unless v is equal to u. | |
1da177e4 | 53 | * |
8c0b8139 | 54 | * Atomically adds @a to @v, so long as it was not @u. |
f24219b4 | 55 | * Returns the old value of @v. |
1da177e4 | 56 | */ |
f24219b4 | 57 | static inline int __atomic_add_unless(atomic_t *v, int a, int u) |
8426e1f6 | 58 | { |
8c0b8139 PM |
59 | int c, old; |
60 | c = atomic_read(v); | |
61 | for (;;) { | |
62 | if (unlikely(c == (u))) | |
63 | break; | |
64 | old = atomic_cmpxchg((v), c, c + (a)); | |
65 | if (likely(old == c)) | |
66 | break; | |
67 | c = old; | |
68 | } | |
69 | ||
f24219b4 | 70 | return c; |
8426e1f6 | 71 | } |
8426e1f6 | 72 | |
2b47d54e RF |
73 | #endif /* CONFIG_CPU_J2 */ |
74 | ||
1da177e4 | 75 | #endif /* __ASM_SH_ATOMIC_H */ |