1 /* SPDX-License-Identifier: GPL-2.0+ */ 2 /* 3 * Copyright (C) 2016 Cadence Design Systems Inc. 4 */ 5 6 #ifndef _XTENSA_ATOMIC_H 7 #define _XTENSA_ATOMIC_H 8 9 #include <asm/system.h> 10 11 typedef struct { volatile int counter; } atomic_t; 12 13 #define ATOMIC_INIT(i) { (i) } 14 15 #define atomic_read(v) ((v)->counter) 16 #define atomic_set(v, i) ((v)->counter = (i)) 17 18 static inline void atomic_add(int i, atomic_t *v) 19 { 20 unsigned long flags; 21 22 local_irq_save(flags); 23 v->counter += i; 24 local_irq_restore(flags); 25 } 26 27 static inline void atomic_sub(int i, atomic_t *v) 28 { 29 unsigned long flags; 30 31 local_irq_save(flags); 32 v->counter -= i; 33 local_irq_restore(flags); 34 } 35 36 static inline void atomic_inc(atomic_t *v) 37 { 38 unsigned long flags; 39 40 local_irq_save(flags); 41 ++v->counter; 42 local_irq_restore(flags); 43 } 44 45 static inline void atomic_dec(atomic_t *v) 46 { 47 unsigned long flags; 48 49 local_irq_save(flags); 50 --v->counter; 51 local_irq_restore(flags); 52 } 53 54 #endif 55