1 files changed, 47 insertions, 0 deletions
diff --git a/drivers/net/wireless/realtek/rtw89/util.h b/drivers/net/wireless/realtek/rtw89/util.h
new file mode 100644
index 000000000..1ae80b756
--- /dev/null
+++ b/drivers/net/wireless/realtek/rtw89/util.h
@@ -0,0 +1,47 @@
+/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+ * Copyright(c) 2019-2020  Realtek Corporation
+ */
+#ifndef __RTW89_UTIL_H__
+#define __RTW89_UTIL_H__
+
+#include "core.h"
+
+#define rtw89_iterate_vifs_bh(rtwdev, iterator, data)                          \
+	ieee80211_iterate_active_interfaces_atomic((rtwdev)->hw,               \
+			IEEE80211_IFACE_ITER_NORMAL, iterator, data)
+
+/* call this function with rtwdev->mutex is held */
+#define rtw89_for_each_rtwvif(rtwdev, rtwvif)				       \
+	list_for_each_entry(rtwvif, &(rtwdev)->rtwvifs_list, list)
+
+/* The result of negative dividend and positive divisor is undefined, but it
+ * should be one case of round-down or round-up. So, make it round-down if the
+ * result is round-up.
+ * Note: the maximum value of divisor is 0x7FFF_FFFF, because we cast it to
+ *       signed value to make compiler to use signed divide instruction.
+ */
+static inline s32 s32_div_u32_round_down(s32 dividend, u32 divisor, s32 *remainder)
+{
+	s32 i_divisor = (s32)divisor;
+	s32 i_remainder;
+	s32 quotient;
+
+	quotient = dividend / i_divisor;
+	i_remainder = dividend % i_divisor;
+
+	if (i_remainder < 0) {
+		quotient--;
+		i_remainder += i_divisor;
+	}
+
+	if (remainder)
+		*remainder = i_remainder;
+	return quotient;
+}
+
+static inline s32 s32_div_u32_round_closest(s32 dividend, u32 divisor)
+{
+	return s32_div_u32_round_down(dividend + divisor / 2, divisor, NULL);
+}
+
+#endif