drivers/staging/media/atomisp/pci/atomisp2/css2400/hive_isp_css_shared/host/tag.c

   1 /*
   2  * Support for Intel Camera Imaging ISP subsystem.
   3  * Copyright (c) 2015, Intel Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  */
  14
  15 #include "tag.h"
  16 #include <platform_support.h>   /* NULL */
  17 #include <assert_support.h>
  18 #include "tag_local.h"
  19
  20 /*
  21  * @brief       Creates the tag description from the given parameters.
  22  * @param[in]   num_captures
  23  * @param[in]   skip
  24  * @param[in]   offset
  25  * @param[out]  tag_descr
  26  */
  27 void
  28 sh_css_create_tag_descr(int num_captures,
  29                         unsigned int skip,
  30                         int offset,
  31                         unsigned int exp_id,
  32                         struct sh_css_tag_descr *tag_descr)
  33 {
  34         assert(tag_descr != NULL);
  35
  36         tag_descr->num_captures = num_captures;
  37         tag_descr->skip         = skip;
  38         tag_descr->offset       = offset;
  39         tag_descr->exp_id       = exp_id;
  40 }
  41
  42 /*
  43  * @brief       Encodes the members of tag description into a 32-bit value.
  44  * @param[in]   tag             Pointer to the tag description
  45  * @return      (unsigned int)  Encoded 32-bit tag-info
  46  */
  47 unsigned int
  48 sh_css_encode_tag_descr(struct sh_css_tag_descr *tag)
  49 {
  50         int num_captures;
  51         unsigned int num_captures_sign;
  52         unsigned int skip;
  53         int offset;
  54         unsigned int offset_sign;
  55         unsigned int exp_id;
  56         unsigned int encoded_tag;
  57
  58         assert(tag != NULL);
  59
  60         if (tag->num_captures < 0) {
  61                 num_captures = -tag->num_captures;
  62                 num_captures_sign = 1;
  63         } else {
  64                 num_captures = tag->num_captures;
  65                 num_captures_sign = 0;
  66         }
  67         skip = tag->skip;
  68         if (tag->offset < 0) {
  69                 offset = -tag->offset;
  70                 offset_sign = 1;
  71         } else {
  72                 offset = tag->offset;
  73                 offset_sign = 0;
  74         }
  75         exp_id = tag->exp_id;
  76
  77         if (exp_id != 0)
  78         {
  79                 /* we encode either an exp_id or capture data */
  80                 assert((num_captures == 0) && (skip == 0) && (offset == 0));
  81
  82                 encoded_tag = TAG_EXP | (exp_id & 0xFF) << TAG_EXP_ID_SHIFT;
  83         }
  84         else
  85         {
  86                 encoded_tag = TAG_CAP
  87                                 | ((num_captures_sign & 0x00000001) << TAG_NUM_CAPTURES_SIGN_SHIFT)
  88                                 | ((offset_sign       & 0x00000001) << TAG_OFFSET_SIGN_SHIFT)
  89                                 | ((num_captures      & 0x000000FF) << TAG_NUM_CAPTURES_SHIFT)
  90                                 | ((skip              & 0x000000FF) << TAG_OFFSET_SHIFT)
  91                                 | ((offset            & 0x000000FF) << TAG_SKIP_SHIFT);
  92
  93         }
  94         return encoded_tag;
  95 }