drivers/net/wireless/realtek/rtw89/util.h

   1 /* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
   2  * Copyright(c) 2019-2020  Realtek Corporation
   3  */
   4 #ifndef __RTW89_UTIL_H__
   5 #define __RTW89_UTIL_H__
   6
   7 #include "core.h"
   8
   9 #define rtw89_iterate_vifs_bh(rtwdev, iterator, data)                          \
  10         ieee80211_iterate_active_interfaces_atomic((rtwdev)->hw,               \
  11                         IEEE80211_IFACE_ITER_NORMAL, iterator, data)
  12
  13 /* call this function with rtwdev->mutex is held */
  14 #define rtw89_for_each_rtwvif(rtwdev, rtwvif)                                  \
  15         list_for_each_entry(rtwvif, &(rtwdev)->rtwvifs_list, list)
  16
  17 /* The result of negative dividend and positive divisor is undefined, but it
  18  * should be one case of round-down or round-up. So, make it round-down if the
  19  * result is round-up.
  20  * Note: the maximum value of divisor is 0x7FFF_FFFF, because we cast it to
  21  *       signed value to make compiler to use signed divide instruction.
  22  */
  23 static inline s32 s32_div_u32_round_down(s32 dividend, u32 divisor, s32 *remainder)
  24 {
  25         s32 i_divisor = (s32)divisor;
  26         s32 i_remainder;
  27         s32 quotient;
  28
  29         quotient = dividend / i_divisor;
  30         i_remainder = dividend % i_divisor;
  31
  32         if (i_remainder < 0) {
  33                 quotient--;
  34                 i_remainder += i_divisor;
  35         }
  36
  37         if (remainder)
  38                 *remainder = i_remainder;
  39         return quotient;
  40 }
  41
  42 static inline s32 s32_div_u32_round_closest(s32 dividend, u32 divisor)
  43 {
  44         return s32_div_u32_round_down(dividend + divisor / 2, divisor, NULL);
  45 }
  46
  47 #endif