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