drivers/net/wireless/mediatek/mt76/util.c

   1 // SPDX-License-Identifier: ISC
   2 /*
   3  * Copyright (C) 2016 Felix Fietkau <nbd@nbd.name>
   4  */
   5
   6 #include <linux/module.h>
   7 #include "mt76.h"
   8
   9 bool __mt76_poll(struct mt76_dev *dev, u32 offset, u32 mask, u32 val,
  10                  int timeout)
  11 {
  12         u32 cur;
  13
  14         timeout /= 10;
  15         do {
  16                 cur = dev->bus->rr(dev, offset) & mask;
  17                 if (cur == val)
  18                         return true;
  19
  20                 udelay(10);
  21         } while (timeout-- > 0);
  22
  23         return false;
  24 }
  25 EXPORT_SYMBOL_GPL(__mt76_poll);
  26
  27 bool __mt76_poll_msec(struct mt76_dev *dev, u32 offset, u32 mask, u32 val,
  28                       int timeout)
  29 {
  30         u32 cur;
  31
  32         timeout /= 10;
  33         do {
  34                 cur = dev->bus->rr(dev, offset) & mask;
  35                 if (cur == val)
  36                         return true;
  37
  38                 usleep_range(10000, 20000);
  39         } while (timeout-- > 0);
  40
  41         return false;
  42 }
  43 EXPORT_SYMBOL_GPL(__mt76_poll_msec);
  44
  45 int mt76_wcid_alloc(unsigned long *mask, int size)
  46 {
  47         int i, idx = 0, cur;
  48
  49         for (i = 0; i < size / BITS_PER_LONG; i++) {
  50                 idx = ffs(~mask[i]);
  51                 if (!idx)
  52                         continue;
  53
  54                 idx--;
  55                 cur = i * BITS_PER_LONG + idx;
  56                 if (cur >= size)
  57                         break;
  58
  59                 mask[i] |= BIT(idx);
  60                 return cur;
  61         }
  62
  63         return -1;
  64 }
  65 EXPORT_SYMBOL_GPL(mt76_wcid_alloc);
  66
  67 int mt76_get_min_avg_rssi(struct mt76_dev *dev)
  68 {
  69         struct mt76_wcid *wcid;
  70         int i, j, min_rssi = 0;
  71         s8 cur_rssi;
  72
  73         local_bh_disable();
  74         rcu_read_lock();
  75
  76         for (i = 0; i < ARRAY_SIZE(dev->wcid_mask); i++) {
  77                 unsigned long mask = dev->wcid_mask[i];
  78
  79                 if (!mask)
  80                         continue;
  81
  82                 for (j = i * BITS_PER_LONG; mask; j++, mask >>= 1) {
  83                         if (!(mask & 1))
  84                                 continue;
  85
  86                         wcid = rcu_dereference(dev->wcid[j]);
  87                         if (!wcid)
  88                                 continue;
  89
  90                         spin_lock(&dev->rx_lock);
  91                         if (wcid->inactive_count++ < 5)
  92                                 cur_rssi = -ewma_signal_read(&wcid->rssi);
  93                         else
  94                                 cur_rssi = 0;
  95                         spin_unlock(&dev->rx_lock);
  96
  97                         if (cur_rssi < min_rssi)
  98                                 min_rssi = cur_rssi;
  99                 }
 100         }
 101
 102         rcu_read_unlock();
 103         local_bh_enable();
 104
 105         return min_rssi;
 106 }
 107 EXPORT_SYMBOL_GPL(mt76_get_min_avg_rssi);
 108
 109 MODULE_LICENSE("Dual BSD/GPL");