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/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2019 Western Digital Corporation or its affiliates.
*
* Authors:
* Anup Patel <anup.patel@wdc.com>
*/
#ifndef __RISCV_ATOMIC_H__
#define __RISCV_ATOMIC_H__
typedef struct {
volatile long counter;
} atomic_t;
#define ATOMIC_INIT(_lptr, val) (_lptr)->counter = (val)
#define ATOMIC_INITIALIZER(val) \
{ \
.counter = (val), \
}
long atomic_read(atomic_t *atom);
void atomic_write(atomic_t *atom, long value);
long atomic_add_return(atomic_t *atom, long value);
long atomic_sub_return(atomic_t *atom, long value);
long atomic_cmpxchg(atomic_t *atom, long oldval, long newval);
long atomic_xchg(atomic_t *atom, long newval);
unsigned int atomic_raw_xchg_uint(volatile unsigned int *ptr,
unsigned int newval);
unsigned long atomic_raw_xchg_ulong(volatile unsigned long *ptr,
unsigned long newval);
/**
* Set a bit in an atomic variable and return the value of bit before modify.
* @nr : Bit to set.
* @atom: atomic variable to modify
*/
int atomic_set_bit(int nr, atomic_t *atom);
/**
* Clear a bit in an atomic variable and return the value of bit before modify.
* @nr : Bit to set.
* @atom: atomic variable to modify
*/
int atomic_clear_bit(int nr, atomic_t *atom);
/**
* Set a bit in any address and return the value of bit before modify.
* @nr : Bit to set.
* @addr: Address to modify
*/
int atomic_raw_set_bit(int nr, volatile unsigned long *addr);
/**
* Clear a bit in any address and return the value of bit before modify.
* @nr : Bit to set.
* @addr: Address to modify
*/
int atomic_raw_clear_bit(int nr, volatile unsigned long *addr);
#endif
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