diff options
Diffstat (limited to 'drivers/staging/media/atomisp/pci/sh_css_frac.h')
| -rw-r--r-- | drivers/staging/media/atomisp/pci/sh_css_frac.h | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/drivers/staging/media/atomisp/pci/sh_css_frac.h b/drivers/staging/media/atomisp/pci/sh_css_frac.h new file mode 100644 index 000000000000..cd2d755ec523 --- /dev/null +++ b/drivers/staging/media/atomisp/pci/sh_css_frac.h @@ -0,0 +1,40 @@ +/* + * 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 __SH_CSS_FRAC_H +#define __SH_CSS_FRAC_H + +#include <math_support.h> + +#define sISP_REG_BIT ISP_VEC_ELEMBITS +#define uISP_REG_BIT ((unsigned int)(sISP_REG_BIT - 1)) +#define sSHIFT (16 - sISP_REG_BIT) +#define uSHIFT ((unsigned int)(16 - uISP_REG_BIT)) +#define sFRACTION_BITS_FITTING(a) (a - sSHIFT) +#define uFRACTION_BITS_FITTING(a) ((unsigned int)(a - uSHIFT)) +#define sISP_VAL_MIN (-(1 << uISP_REG_BIT)) +#define sISP_VAL_MAX ((1 << uISP_REG_BIT) - 1) +#define uISP_VAL_MIN (0U) +#define uISP_VAL_MAX ((unsigned int)((1 << uISP_REG_BIT) - 1)) + +/* a:fraction bits for 16bit precision, b:fraction bits for ISP precision */ +#define sDIGIT_FITTING(v, a, b) \ + min_t(int, max_t(int, (((v) >> sSHIFT) >> max(sFRACTION_BITS_FITTING(a) - (b), 0)), \ + sISP_VAL_MIN), sISP_VAL_MAX) +#define uDIGIT_FITTING(v, a, b) \ + min((unsigned int)max((unsigned)(((v) >> uSHIFT) \ + >> max((int)(uFRACTION_BITS_FITTING(a) - (b)), 0)), \ + uISP_VAL_MIN), uISP_VAL_MAX) + +#endif /* __SH_CSS_FRAC_H */ |