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 */
23static 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
42static 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
47static inline void ether_addr_copy_mask(u8 *dst, const u8 *src, u8 mask)
48{
49	int i;
50
51	eth_zero_addr(dst);
52	for (i = 0; i < ETH_ALEN; i++) {
53		if (mask & BIT(i))
54			dst[i] = src[i];
55	}
56}
57
58#endif
59