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

/*
 * Copyright (C) 2016 Felix Fietkau <nbd@nbd.name>
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <linux/module.h>
#include "mt76.h"

bool __mt76_poll(struct mt76_dev *dev, u32 offset, u32 mask, u32 val,
		 int timeout)
{
	u32 cur;

	timeout /= 10;
	do {
		cur = dev->bus->rr(dev, offset) & mask;
		if (cur == val)
			return true;

		udelay(10);
	} while (timeout-- > 0);

	return false;
}
EXPORT_SYMBOL_GPL(__mt76_poll);

bool __mt76_poll_msec(struct mt76_dev *dev, u32 offset, u32 mask, u32 val,
		      int timeout)
{
	u32 cur;

	timeout /= 10;
	do {
		cur = dev->bus->rr(dev, offset) & mask;
		if (cur == val)
			return true;

		usleep_range(10000, 20000);
	} while (timeout-- > 0);

	return false;
}
EXPORT_SYMBOL_GPL(__mt76_poll_msec);

int mt76_wcid_alloc(unsigned long *mask, int size)
{
	int i, idx = 0, cur;

	for (i = 0; i < size / BITS_PER_LONG; i++) {
		idx = ffs(~mask[i]);
		if (!idx)
			continue;

		idx--;
		cur = i * BITS_PER_LONG + idx;
		if (cur >= size)
			break;

		mask[i] |= BIT(idx);
		return cur;
	}

	return -1;
}
EXPORT_SYMBOL_GPL(mt76_wcid_alloc);

MODULE_LICENSE("Dual BSD/GPL");