mt76/mt76x2/mac.c

0001 // SPDX-License-Identifier: ISC
0002 /*
0003  * Copyright (C) 2016 Felix Fietkau <nbd@nbd.name>
0004  * Copyright (C) 2018 Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
0005  */
0006
0007 #include "mt76x2.h"
0008
0009 void mt76x2_mac_stop(struct mt76x02_dev *dev, bool force)
0010 {
0011     bool stopped = false;
0012     u32 rts_cfg;
0013     int i;
0014
0015     mt76_clear(dev, MT_TXOP_CTRL_CFG, MT_TXOP_ED_CCA_EN);
0016     mt76_clear(dev, MT_TXOP_HLDR_ET, MT_TXOP_HLDR_TX40M_BLK_EN);
0017
0018     mt76_wr(dev, MT_MAC_SYS_CTRL, 0);
0019
0020     rts_cfg = mt76_rr(dev, MT_TX_RTS_CFG);
0021     mt76_wr(dev, MT_TX_RTS_CFG, rts_cfg & ~MT_TX_RTS_CFG_RETRY_LIMIT);
0022
0023     /* Wait for MAC to become idle */
0024     for (i = 0; i < 300; i++) {
0025         if ((mt76_rr(dev, MT_MAC_STATUS) &
0026              (MT_MAC_STATUS_RX | MT_MAC_STATUS_TX)) ||
0027             mt76_rr(dev, MT_BBP(IBI, 12))) {
0028             udelay(1);
0029             continue;
0030         }
0031
0032         stopped = true;
0033         break;
0034     }
0035
0036     if (force && !stopped) {
0037         mt76_set(dev, MT_BBP(CORE, 4), BIT(1));
0038         mt76_clear(dev, MT_BBP(CORE, 4), BIT(1));
0039
0040         mt76_set(dev, MT_BBP(CORE, 4), BIT(0));
0041         mt76_clear(dev, MT_BBP(CORE, 4), BIT(0));
0042     }
0043
0044     mt76_wr(dev, MT_TX_RTS_CFG, rts_cfg);
0045 }
0046 EXPORT_SYMBOL_GPL(mt76x2_mac_stop);