/* 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 __SH_CSS_FRAC_H
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#define __SH_CSS_FRAC_H
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#include <math_support.h>
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#define sISP_REG_BIT ISP_VEC_ELEMBITS
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#define uISP_REG_BIT ((unsigned int)(sISP_REG_BIT - 1))
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#define sSHIFT (16 - sISP_REG_BIT)
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#define uSHIFT ((unsigned int)(16 - uISP_REG_BIT))
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#define sFRACTION_BITS_FITTING(a) (a - sSHIFT)
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#define uFRACTION_BITS_FITTING(a) ((unsigned int)(a - uSHIFT))
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#define sISP_VAL_MIN (-(1 << uISP_REG_BIT))
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#define sISP_VAL_MAX ((1 << uISP_REG_BIT) - 1)
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#define uISP_VAL_MIN (0U)
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#define uISP_VAL_MAX ((unsigned int)((1 << uISP_REG_BIT) - 1))
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/* a:fraction bits for 16bit precision, b:fraction bits for ISP precision */
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#define sDIGIT_FITTING(v, a, b) \
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min_t(int, max_t(int, (((v) >> sSHIFT) >> max(sFRACTION_BITS_FITTING(a) - (b), 0)), \
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sISP_VAL_MIN), sISP_VAL_MAX)
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#define uDIGIT_FITTING(v, a, b) \
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min((unsigned int)max((unsigned)(((v) >> uSHIFT) \
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>> max((int)(uFRACTION_BITS_FITTING(a) - (b)), 0)), \
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uISP_VAL_MIN), uISP_VAL_MAX)
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#endif /* __SH_CSS_FRAC_H */
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