drivers/net/wireless/mediatek/mt76/mt76x2/mac.c

   1 // SPDX-License-Identifier: ISC
   2 /*
   3  * Copyright (C) 2016 Felix Fietkau <nbd@nbd.name>
   4  * Copyright (C) 2018 Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
   5  */
   6
   7 #include "mt76x2.h"
   8
   9 void mt76x2_mac_stop(struct mt76x02_dev *dev, bool force)
  10 {
  11         bool stopped = false;
  12         u32 rts_cfg;
  13         int i;
  14
  15         mt76_clear(dev, MT_TXOP_CTRL_CFG, MT_TXOP_ED_CCA_EN);
  16         mt76_clear(dev, MT_TXOP_HLDR_ET, MT_TXOP_HLDR_TX40M_BLK_EN);
  17
  18         mt76_wr(dev, MT_MAC_SYS_CTRL, 0);
  19
  20         rts_cfg = mt76_rr(dev, MT_TX_RTS_CFG);
  21         mt76_wr(dev, MT_TX_RTS_CFG, rts_cfg & ~MT_TX_RTS_CFG_RETRY_LIMIT);
  22
  23         /* Wait for MAC to become idle */
  24         for (i = 0; i < 300; i++) {
  25                 if ((mt76_rr(dev, MT_MAC_STATUS) &
  26                      (MT_MAC_STATUS_RX | MT_MAC_STATUS_TX)) ||
  27                     mt76_rr(dev, MT_BBP(IBI, 12))) {
  28                         udelay(1);
  29                         continue;
  30                 }
  31
  32                 stopped = true;
  33                 break;
  34         }
  35
  36         if (force && !stopped) {
  37                 mt76_set(dev, MT_BBP(CORE, 4), BIT(1));
  38                 mt76_clear(dev, MT_BBP(CORE, 4), BIT(1));
  39
  40                 mt76_set(dev, MT_BBP(CORE, 4), BIT(0));
  41                 mt76_clear(dev, MT_BBP(CORE, 4), BIT(0));
  42         }
  43
  44         mt76_wr(dev, MT_TX_RTS_CFG, rts_cfg);
  45 }
  46 EXPORT_SYMBOL_GPL(mt76x2_mac_stop);