| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | #ifndef __ARCH_H8300_ATOMIC__ |
| 3 | #define __ARCH_H8300_ATOMIC__ |
| 4 | |
| 5 | #include <linux/compiler.h> |
| 6 | #include <linux/types.h> |
| 7 | #include <asm/cmpxchg.h> |
| 8 | #include <asm/irqflags.h> |
| 9 | |
| 10 | /* |
| 11 | * Atomic operations that C can't guarantee us. Useful for |
| 12 | * resource counting etc.. |
| 13 | */ |
| 14 | |
| Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 15 | #define atomic_read(v) READ_ONCE((v)->counter) |
| 16 | #define atomic_set(v, i) WRITE_ONCE(((v)->counter), (i)) |
| 17 | |
| 18 | #define ATOMIC_OP_RETURN(op, c_op) \ |
| 19 | static inline int atomic_##op##_return(int i, atomic_t *v) \ |
| 20 | { \ |
| 21 | h8300flags flags; \ |
| 22 | int ret; \ |
| 23 | \ |
| 24 | flags = arch_local_irq_save(); \ |
| 25 | ret = v->counter c_op i; \ |
| 26 | arch_local_irq_restore(flags); \ |
| 27 | return ret; \ |
| 28 | } |
| 29 | |
| 30 | #define ATOMIC_FETCH_OP(op, c_op) \ |
| 31 | static inline int atomic_fetch_##op(int i, atomic_t *v) \ |
| 32 | { \ |
| 33 | h8300flags flags; \ |
| 34 | int ret; \ |
| 35 | \ |
| 36 | flags = arch_local_irq_save(); \ |
| 37 | ret = v->counter; \ |
| 38 | v->counter c_op i; \ |
| 39 | arch_local_irq_restore(flags); \ |
| 40 | return ret; \ |
| 41 | } |
| 42 | |
| 43 | #define ATOMIC_OP(op, c_op) \ |
| 44 | static inline void atomic_##op(int i, atomic_t *v) \ |
| 45 | { \ |
| 46 | h8300flags flags; \ |
| 47 | \ |
| 48 | flags = arch_local_irq_save(); \ |
| 49 | v->counter c_op i; \ |
| 50 | arch_local_irq_restore(flags); \ |
| 51 | } |
| 52 | |
| 53 | ATOMIC_OP_RETURN(add, +=) |
| 54 | ATOMIC_OP_RETURN(sub, -=) |
| 55 | |
| 56 | #define ATOMIC_OPS(op, c_op) \ |
| 57 | ATOMIC_OP(op, c_op) \ |
| 58 | ATOMIC_FETCH_OP(op, c_op) |
| 59 | |
| 60 | ATOMIC_OPS(and, &=) |
| 61 | ATOMIC_OPS(or, |=) |
| 62 | ATOMIC_OPS(xor, ^=) |
| 63 | ATOMIC_OPS(add, +=) |
| 64 | ATOMIC_OPS(sub, -=) |
| 65 | |
| 66 | #undef ATOMIC_OPS |
| 67 | #undef ATOMIC_OP_RETURN |
| 68 | #undef ATOMIC_OP |
| 69 | |
| 70 | static inline int atomic_cmpxchg(atomic_t *v, int old, int new) |
| 71 | { |
| 72 | int ret; |
| 73 | h8300flags flags; |
| 74 | |
| 75 | flags = arch_local_irq_save(); |
| 76 | ret = v->counter; |
| 77 | if (likely(ret == old)) |
| 78 | v->counter = new; |
| 79 | arch_local_irq_restore(flags); |
| 80 | return ret; |
| 81 | } |
| 82 | |
| 83 | static inline int atomic_fetch_add_unless(atomic_t *v, int a, int u) |
| 84 | { |
| 85 | int ret; |
| 86 | h8300flags flags; |
| 87 | |
| 88 | flags = arch_local_irq_save(); |
| 89 | ret = v->counter; |
| 90 | if (ret != u) |
| 91 | v->counter += a; |
| 92 | arch_local_irq_restore(flags); |
| 93 | return ret; |
| 94 | } |
| 95 | #define atomic_fetch_add_unless atomic_fetch_add_unless |
| 96 | |
| 97 | #endif /* __ARCH_H8300_ATOMIC __ */ |