util.c

  1// SPDX-License-Identifier: BSD-3-Clause-Clear
  2/*
  3 * Copyright (C) 2016 Felix Fietkau <nbd@nbd.name>
  4 */
  5
  6#include <linux/module.h>
  7#include "mt76.h"
  8
  9bool __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 = __mt76_rr(dev, offset) & mask;
 17		if (cur == val)
 18			return true;
 19
 20		udelay(10);
 21	} while (timeout-- > 0);
 22
 23	return false;
 24}
 25EXPORT_SYMBOL_GPL(__mt76_poll);
 26
 27bool ____mt76_poll_msec(struct mt76_dev *dev, u32 offset, u32 mask, u32 val,
 28			int timeout, int tick)
 29{
 30	u32 cur;
 31
 32	timeout /= tick;
 33	do {
 34		cur = __mt76_rr(dev, offset) & mask;
 35		if (cur == val)
 36			return true;
 37
 38		usleep_range(1000 * tick, 2000 * tick);
 39	} while (timeout-- > 0);
 40
 41	return false;
 42}
 43EXPORT_SYMBOL_GPL(____mt76_poll_msec);
 44
 45int mt76_wcid_alloc(u32 *mask, int size)
 46{
 47	int i, idx = 0, cur;
 48
 49	for (i = 0; i < DIV_ROUND_UP(size, 32); i++) {
 50		idx = ffs(~mask[i]);
 51		if (!idx)
 52			continue;
 53
 54		idx--;
 55		cur = i * 32 + idx;
 56		if (cur >= size)
 57			break;
 58
 59		mask[i] |= BIT(idx);
 60		return cur;
 61	}
 62
 63	return -1;
 64}
 65EXPORT_SYMBOL_GPL(mt76_wcid_alloc);
 66
 67int mt76_get_min_avg_rssi(struct mt76_dev *dev, u8 phy_idx)
 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		u32 mask = dev->wcid_mask[i];
 78
 79		if (!mask)
 80			continue;
 81
 82		for (j = i * 32; mask; j++, mask >>= 1) {
 83			if (!(mask & 1))
 84				continue;
 85
 86			wcid = __mt76_wcid_ptr(dev, j);
 87			if (!wcid || wcid->phy_idx != phy_idx)
 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}
107EXPORT_SYMBOL_GPL(mt76_get_min_avg_rssi);
108
109int __mt76_worker_fn(void *ptr)
110{
111	struct mt76_worker *w = ptr;
112
113	while (!kthread_should_stop()) {
114		set_current_state(TASK_INTERRUPTIBLE);
115
116		if (kthread_should_park()) {
117			kthread_parkme();
118			continue;
119		}
120
121		if (!test_and_clear_bit(MT76_WORKER_SCHEDULED, &w->state)) {
122			schedule();
123			continue;
124		}
125
126		set_bit(MT76_WORKER_RUNNING, &w->state);
127		set_current_state(TASK_RUNNING);
128		w->fn(w);
129		cond_resched();
130		clear_bit(MT76_WORKER_RUNNING, &w->state);
131	}
132
133	return 0;
134}
135EXPORT_SYMBOL_GPL(__mt76_worker_fn);
136
137MODULE_DESCRIPTION("MediaTek MT76x helpers");
138MODULE_LICENSE("Dual BSD/GPL");