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 48