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/*
* SPDX-License-Identifier: BSD-2-Clause
*
* Copyright (c) 2019 Western Digital Corporation or its affiliates.
*
* Authors:
* Atish Patra<atish.patra@wdc.com>
*
*/
#ifndef __SBI_FIFO_H__
#define __SBI_FIFO_H__
#include <sbi/riscv_locks.h>
#include <sbi/sbi_types.h>
struct sbi_fifo {
void *queue;
spinlock_t qlock;
u16 entry_size;
u16 num_entries;
u16 avail;
u16 tail;
};
#define SBI_FIFO_INITIALIZER(__queue_mem, __entries, __entry_size) \
{ .queue = __queue_mem, \
.qlock = SPIN_LOCK_INITIALIZER, \
.num_entries = __entries, \
.entry_size = __entry_size, \
.avail = 0, \
.tail = 0, \
}
#define SBI_FIFO_DEFINE(__name, __queue_mem, __entries, __entry_size) \
struct sbi_fifo __name = SBI_FIFO_INITIALIZER(__queue_mem, __entries, __entry_size)
enum sbi_fifo_inplace_update_types {
SBI_FIFO_SKIP,
SBI_FIFO_UPDATED,
SBI_FIFO_UNCHANGED,
};
int sbi_fifo_dequeue(struct sbi_fifo *fifo, void *data);
int sbi_fifo_enqueue(struct sbi_fifo *fifo, void *data, bool force);
void sbi_fifo_init(struct sbi_fifo *fifo, void *queue_mem, u16 entries,
u16 entry_size);
int sbi_fifo_is_empty(struct sbi_fifo *fifo);
int sbi_fifo_is_full(struct sbi_fifo *fifo);
int sbi_fifo_inplace_update(struct sbi_fifo *fifo, void *in,
int (*fptr)(void *in, void *data));
u16 sbi_fifo_avail(struct sbi_fifo *fifo);
#endif
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