/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Support for Intel Camera Imaging ISP subsystem.
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* Copyright (c) 2015, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#ifndef _IA_CSS_CIRCBUF_COMM_H
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#define _IA_CSS_CIRCBUF_COMM_H
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#include <type_support.h> /* uint8_t, uint32_t */
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#define IA_CSS_CIRCBUF_PADDING 1 /* The circular buffer is implemented in lock-less manner, wherein
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* the head and tail can advance independently without any locks.
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* But to achieve this, an extra buffer element is required to detect
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* queue full & empty conditions, wherein the tail trails the head for
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* full and is equal to head for empty condition. This causes 1 buffer
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* not being available for use.
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*/
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/****************************************************************
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*
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* Portable Data structures
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*
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****************************************************************/
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/**
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* @brief Data structure for the circular descriptor.
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*/
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typedef struct ia_css_circbuf_desc_s ia_css_circbuf_desc_t;
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struct ia_css_circbuf_desc_s {
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u8 size; /* the maximum number of elements*/
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u8 step; /* number of bytes per element */
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u8 start; /* index of the oldest element */
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u8 end; /* index at which to write the new element */
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};
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#define SIZE_OF_IA_CSS_CIRCBUF_DESC_S_STRUCT \
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(4 * sizeof(uint8_t))
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/**
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* @brief Data structure for the circular buffer element.
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*/
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typedef struct ia_css_circbuf_elem_s ia_css_circbuf_elem_t;
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struct ia_css_circbuf_elem_s {
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u32 val; /* the value stored in the element */
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};
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#define SIZE_OF_IA_CSS_CIRCBUF_ELEM_S_STRUCT \
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(sizeof(uint32_t))
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#endif /*_IA_CSS_CIRCBUF_COMM_H*/
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