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Diffstat (limited to 'arch/csky/include/asm/atomic.h')
| -rw-r--r-- | arch/csky/include/asm/atomic.h | 212 |
1 files changed, 212 insertions, 0 deletions
diff --git a/arch/csky/include/asm/atomic.h b/arch/csky/include/asm/atomic.h new file mode 100644 index 000000000000..e369d73b13e3 --- /dev/null +++ b/arch/csky/include/asm/atomic.h @@ -0,0 +1,212 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef __ASM_CSKY_ATOMIC_H +#define __ASM_CSKY_ATOMIC_H + +#include <linux/version.h> +#include <asm/cmpxchg.h> +#include <asm/barrier.h> + +#ifdef CONFIG_CPU_HAS_LDSTEX + +#define __atomic_add_unless __atomic_add_unless +static inline int __atomic_add_unless(atomic_t *v, int a, int u) +{ + unsigned long tmp, ret; + + smp_mb(); + + asm volatile ( + "1: ldex.w %0, (%3) \n" + " mov %1, %0 \n" + " cmpne %0, %4 \n" + " bf 2f \n" + " add %0, %2 \n" + " stex.w %0, (%3) \n" + " bez %0, 1b \n" + "2: \n" + : "=&r" (tmp), "=&r" (ret) + : "r" (a), "r"(&v->counter), "r"(u) + : "memory"); + + if (ret != u) + smp_mb(); + + return ret; +} + +#define ATOMIC_OP(op, c_op) \ +static inline void atomic_##op(int i, atomic_t *v) \ +{ \ + unsigned long tmp; \ + \ + asm volatile ( \ + "1: ldex.w %0, (%2) \n" \ + " " #op " %0, %1 \n" \ + " stex.w %0, (%2) \n" \ + " bez %0, 1b \n" \ + : "=&r" (tmp) \ + : "r" (i), "r"(&v->counter) \ + : "memory"); \ +} + +#define ATOMIC_OP_RETURN(op, c_op) \ +static inline int atomic_##op##_return(int i, atomic_t *v) \ +{ \ + unsigned long tmp, ret; \ + \ + smp_mb(); \ + asm volatile ( \ + "1: ldex.w %0, (%3) \n" \ + " " #op " %0, %2 \n" \ + " mov %1, %0 \n" \ + " stex.w %0, (%3) \n" \ + " bez %0, 1b \n" \ + : "=&r" (tmp), "=&r" (ret) \ + : "r" (i), "r"(&v->counter) \ + : "memory"); \ + smp_mb(); \ + \ + return ret; \ +} + +#define ATOMIC_FETCH_OP(op, c_op) \ +static inline int atomic_fetch_##op(int i, atomic_t *v) \ +{ \ + unsigned long tmp, ret; \ + \ + smp_mb(); \ + asm volatile ( \ + "1: ldex.w %0, (%3) \n" \ + " mov %1, %0 \n" \ + " " #op " %0, %2 \n" \ + " stex.w %0, (%3) \n" \ + " bez %0, 1b \n" \ + : "=&r" (tmp), "=&r" (ret) \ + : "r" (i), "r"(&v->counter) \ + : "memory"); \ + smp_mb(); \ + \ + return ret; \ +} + +#else /* CONFIG_CPU_HAS_LDSTEX */ + +#include <linux/irqflags.h> + +#define __atomic_add_unless __atomic_add_unless +static inline int __atomic_add_unless(atomic_t *v, int a, int u) +{ + unsigned long tmp, ret, flags; + + raw_local_irq_save(flags); + + asm volatile ( + " ldw %0, (%3) \n" + " mov %1, %0 \n" + " cmpne %0, %4 \n" + " bf 2f \n" + " add %0, %2 \n" + " stw %0, (%3) \n" + "2: \n" + : "=&r" (tmp), "=&r" (ret) + : "r" (a), "r"(&v->counter), "r"(u) + : "memory"); + + raw_local_irq_restore(flags); + + return ret; +} + +#define ATOMIC_OP(op, c_op) \ +static inline void atomic_##op(int i, atomic_t *v) \ +{ \ + unsigned long tmp, flags; \ + \ + raw_local_irq_save(flags); \ + \ + asm volatile ( \ + " ldw %0, (%2) \n" \ + " " #op " %0, %1 \n" \ + " stw %0, (%2) \n" \ + : "=&r" (tmp) \ + : "r" (i), "r"(&v->counter) \ + : "memory"); \ + \ + raw_local_irq_restore(flags); \ +} + +#define ATOMIC_OP_RETURN(op, c_op) \ +static inline int atomic_##op##_return(int i, atomic_t *v) \ +{ \ + unsigned long tmp, ret, flags; \ + \ + raw_local_irq_save(flags); \ + \ + asm volatile ( \ + " ldw %0, (%3) \n" \ + " " #op " %0, %2 \n" \ + " stw %0, (%3) \n" \ + " mov %1, %0 \n" \ + : "=&r" (tmp), "=&r" (ret) \ + : "r" (i), "r"(&v->counter) \ + : "memory"); \ + \ + raw_local_irq_restore(flags); \ + \ + return ret; \ +} + +#define ATOMIC_FETCH_OP(op, c_op) \ +static inline int atomic_fetch_##op(int i, atomic_t *v) \ +{ \ + unsigned long tmp, ret, flags; \ + \ + raw_local_irq_save(flags); \ + \ + asm volatile ( \ + " ldw %0, (%3) \n" \ + " mov %1, %0 \n" \ + " " #op " %0, %2 \n" \ + " stw %0, (%3) \n" \ + : "=&r" (tmp), "=&r" (ret) \ + : "r" (i), "r"(&v->counter) \ + : "memory"); \ + \ + raw_local_irq_restore(flags); \ + \ + return ret; \ +} + +#endif /* CONFIG_CPU_HAS_LDSTEX */ + +#define atomic_add_return atomic_add_return +ATOMIC_OP_RETURN(add, +) +#define atomic_sub_return atomic_sub_return +ATOMIC_OP_RETURN(sub, -) + +#define atomic_fetch_add atomic_fetch_add +ATOMIC_FETCH_OP(add, +) +#define atomic_fetch_sub atomic_fetch_sub +ATOMIC_FETCH_OP(sub, -) +#define atomic_fetch_and atomic_fetch_and +ATOMIC_FETCH_OP(and, &) +#define atomic_fetch_or atomic_fetch_or +ATOMIC_FETCH_OP(or, |) +#define atomic_fetch_xor atomic_fetch_xor +ATOMIC_FETCH_OP(xor, ^) + +#define atomic_and atomic_and +ATOMIC_OP(and, &) +#define atomic_or atomic_or +ATOMIC_OP(or, |) +#define atomic_xor atomic_xor +ATOMIC_OP(xor, ^) + +#undef ATOMIC_FETCH_OP +#undef ATOMIC_OP_RETURN +#undef ATOMIC_OP + +#include <asm-generic/atomic.h> + +#endif /* __ASM_CSKY_ATOMIC_H */ |