diff options
Diffstat (limited to 'drivers/staging/media/atomisp/pci/atomisp2/css2400/base/circbuf/interface/ia_css_circbuf_desc.h')
| -rw-r--r-- | drivers/staging/media/atomisp/pci/atomisp2/css2400/base/circbuf/interface/ia_css_circbuf_desc.h | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/drivers/staging/media/atomisp/pci/atomisp2/css2400/base/circbuf/interface/ia_css_circbuf_desc.h b/drivers/staging/media/atomisp/pci/atomisp2/css2400/base/circbuf/interface/ia_css_circbuf_desc.h new file mode 100644 index 0000000..a8447d4 --- /dev/null +++ b/drivers/staging/media/atomisp/pci/atomisp2/css2400/base/circbuf/interface/ia_css_circbuf_desc.h @@ -0,0 +1,170 @@ +/* + * Support for Intel Camera Imaging ISP subsystem. + * Copyright (c) 2015, Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + */ + +#ifndef _IA_CSS_CIRCBUF_DESC_H_ +#define _IA_CSS_CIRCBUF_DESC_H_ + +#include <type_support.h> +#include <math_support.h> +#include <storage_class.h> +#include <platform_support.h> +#include <sp.h> +#include "ia_css_circbuf_comm.h" +/**************************************************************** + * + * Inline functions. + * + ****************************************************************/ +/** + * @brief Test if the circular buffer is empty. + * + * @param cb_desc The pointer to the circular buffer descriptor. + * + * @return + * - true when it is empty. + * - false when it is not empty. + */ +STORAGE_CLASS_INLINE bool ia_css_circbuf_desc_is_empty( + ia_css_circbuf_desc_t *cb_desc) +{ + OP___assert(cb_desc != NULL); + return (cb_desc->end == cb_desc->start); +} + +/** + * @brief Test if the circular buffer descriptor is full. + * + * @param cb_desc The pointer to the circular buffer + * descriptor. + * + * @return + * - true when it is full. + * - false when it is not full. + */ +STORAGE_CLASS_INLINE bool ia_css_circbuf_desc_is_full( + ia_css_circbuf_desc_t *cb_desc) +{ + OP___assert(cb_desc != NULL); + return (OP_std_modadd(cb_desc->end, 1, cb_desc->size) == cb_desc->start); +} + +/** + * @brief Initialize the circular buffer descriptor + * + * @param cb_desc The pointer circular buffer descriptor + * @param size The size of the circular buffer + */ +STORAGE_CLASS_INLINE void ia_css_circbuf_desc_init( + ia_css_circbuf_desc_t *cb_desc, + int8_t size) +{ + OP___assert(cb_desc != NULL); + cb_desc->size = size; +} + +/** + * @brief Get a position in the circular buffer descriptor. + * + * @param cb The pointer to the circular buffer descriptor. + * @param base The base position. + * @param offset The offset. + * + * @return the position in the circular buffer descriptor. + */ +STORAGE_CLASS_INLINE uint8_t ia_css_circbuf_desc_get_pos_at_offset( + ia_css_circbuf_desc_t *cb_desc, + uint32_t base, + int offset) +{ + uint8_t dest; + OP___assert(cb_desc != NULL); + OP___assert(cb_desc->size > 0); + + /* step 1: adjust the offset */ + while (offset < 0) { + offset += cb_desc->size; + } + + /* step 2: shift and round by the upper limit */ + dest = OP_std_modadd(base, offset, cb_desc->size); + + return dest; +} + +/** + * @brief Get the offset between two positions in the circular buffer + * descriptor. + * Get the offset from the source position to the terminal position, + * along the direction in which the new elements come in. + * + * @param cb_desc The pointer to the circular buffer descriptor. + * @param src_pos The source position. + * @param dest_pos The terminal position. + * + * @return the offset. + */ +STORAGE_CLASS_INLINE int ia_css_circbuf_desc_get_offset( + ia_css_circbuf_desc_t *cb_desc, + uint32_t src_pos, + uint32_t dest_pos) +{ + int offset; + OP___assert(cb_desc != NULL); + + offset = (int)(dest_pos - src_pos); + offset += (offset < 0) ? cb_desc->size : 0; + + return offset; +} + +/** + * @brief Get the number of available elements. + * + * @param cb_desc The pointer to the circular buffer. + * + * @return The number of available elements. + */ +STORAGE_CLASS_INLINE uint32_t ia_css_circbuf_desc_get_num_elems( + ia_css_circbuf_desc_t *cb_desc) +{ + int num; + OP___assert(cb_desc != NULL); + + num = ia_css_circbuf_desc_get_offset(cb_desc, + cb_desc->start, + cb_desc->end); + + return (uint32_t)num; +} + +/** + * @brief Get the number of free elements. + * + * @param cb_desc The pointer to the circular buffer descriptor. + * + * @return: The number of free elements. + */ +STORAGE_CLASS_INLINE uint32_t ia_css_circbuf_desc_get_free_elems( + ia_css_circbuf_desc_t *cb_desc) +{ + uint32_t num; + OP___assert(cb_desc != NULL); + + num = ia_css_circbuf_desc_get_offset(cb_desc, + cb_desc->start, + cb_desc->end); + + return (cb_desc->size - num); +} +#endif /*_IA_CSS_CIRCBUF_DESC_H_ */ |
