1 /* 2 * Copyright (C) 2016 Felix Fietkau <nbd@nbd.name> 3 * Copyright (C) 2018 Lorenzo Bianconi <lorenzo.bianconi83@gmail.com> 4 * 5 * Permission to use, copy, modify, and/or distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 #include "mt76x2.h" 19 20 void mt76x2_mac_stop(struct mt76x02_dev *dev, bool force) 21 { 22 bool stopped = false; 23 u32 rts_cfg; 24 int i; 25 26 mt76_wr(dev, MT_MAC_SYS_CTRL, 0); 27 28 rts_cfg = mt76_rr(dev, MT_TX_RTS_CFG); 29 mt76_wr(dev, MT_TX_RTS_CFG, rts_cfg & ~MT_TX_RTS_CFG_RETRY_LIMIT); 30 31 /* Wait for MAC to become idle */ 32 for (i = 0; i < 300; i++) { 33 if ((mt76_rr(dev, MT_MAC_STATUS) & 34 (MT_MAC_STATUS_RX | MT_MAC_STATUS_TX)) || 35 mt76_rr(dev, MT_BBP(IBI, 12))) { 36 udelay(1); 37 continue; 38 } 39 40 stopped = true; 41 break; 42 } 43 44 if (force && !stopped) { 45 mt76_set(dev, MT_BBP(CORE, 4), BIT(1)); 46 mt76_clear(dev, MT_BBP(CORE, 4), BIT(1)); 47 48 mt76_set(dev, MT_BBP(CORE, 4), BIT(0)); 49 mt76_clear(dev, MT_BBP(CORE, 4), BIT(0)); 50 } 51 52 mt76_wr(dev, MT_TX_RTS_CFG, rts_cfg); 53 } 54 EXPORT_SYMBOL_GPL(mt76x2_mac_stop); 55