linux_kernel/drivers/net/wireless/mediatek/mt76/mt76x2_dma.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 "mt76x2.h"
#include "mt76x2_dma.h"

int
mt76x2_tx_queue_mcu(struct mt76x2_dev *dev, enum mt76_txq_id qid,
		    struct sk_buff *skb, int cmd, int seq)
{
	struct mt76_queue *q = &dev->mt76.q_tx[qid];
	struct mt76_queue_buf buf;
	dma_addr_t addr;
	u32 tx_info;

	tx_info = MT_MCU_MSG_TYPE_CMD |
		  FIELD_PREP(MT_MCU_MSG_CMD_TYPE, cmd) |
		  FIELD_PREP(MT_MCU_MSG_CMD_SEQ, seq) |
		  FIELD_PREP(MT_MCU_MSG_PORT, CPU_TX_PORT) |
		  FIELD_PREP(MT_MCU_MSG_LEN, skb->len);

	addr = dma_map_single(dev->mt76.dev, skb->data, skb->len,
			      DMA_TO_DEVICE);
	if (dma_mapping_error(dev->mt76.dev, addr))
		return -ENOMEM;

	buf.addr = addr;
	buf.len = skb->len;
	spin_lock_bh(&q->lock);
	mt76_queue_add_buf(dev, q, &buf, 1, tx_info, skb, NULL);
	mt76_queue_kick(dev, q);
	spin_unlock_bh(&q->lock);

	return 0;
}

static int
mt76x2_init_tx_queue(struct mt76x2_dev *dev, struct mt76_queue *q,
		     int idx, int n_desc)
{
	int ret;

	q->regs = dev->mt76.regs + MT_TX_RING_BASE + idx * MT_RING_SIZE;
	q->ndesc = n_desc;
	q->hw_idx = idx;

	ret = mt76_queue_alloc(dev, q);
	if (ret)
		return ret;

	mt76x2_irq_enable(dev, MT_INT_TX_DONE(idx));

	return 0;
}

void mt76x2_queue_rx_skb(struct mt76_dev *mdev, enum mt76_rxq_id q,
			 struct sk_buff *skb)
{
	struct mt76x2_dev *dev = container_of(mdev, struct mt76x2_dev, mt76);
	void *rxwi = skb->data;

	if (q == MT_RXQ_MCU) {
		skb_queue_tail(&dev->mcu.res_q, skb);
		wake_up(&dev->mcu.wait);
		return;
	}

	skb_pull(skb, sizeof(struct mt76x2_rxwi));
	if (mt76x2_mac_process_rx(dev, skb, rxwi)) {
		dev_kfree_skb(skb);
		return;
	}

	mt76_rx(&dev->mt76, q, skb);
}

static int
mt76x2_init_rx_queue(struct mt76x2_dev *dev, struct mt76_queue *q,
		     int idx, int n_desc, int bufsize)
{
	int ret;

	q->regs = dev->mt76.regs + MT_RX_RING_BASE + idx * MT_RING_SIZE;
	q->ndesc = n_desc;
	q->buf_size = bufsize;

	ret = mt76_queue_alloc(dev, q);
	if (ret)
		return ret;

	mt76x2_irq_enable(dev, MT_INT_RX_DONE(idx));

	return 0;
}

static void
mt76x2_tx_tasklet(unsigned long data)
{
	struct mt76x2_dev *dev = (struct mt76x2_dev *) data;
	int i;

	mt76x2_mac_process_tx_status_fifo(dev);

	for (i = MT_TXQ_MCU; i >= 0; i--)
		mt76_queue_tx_cleanup(dev, i, false);

	mt76x2_mac_poll_tx_status(dev, false);
	mt76x2_irq_enable(dev, MT_INT_TX_DONE_ALL);
}

int mt76x2_dma_init(struct mt76x2_dev *dev)
{
	static const u8 wmm_queue_map[] = {
		[IEEE80211_AC_BE] = 0,
		[IEEE80211_AC_BK] = 1,
		[IEEE80211_AC_VI] = 2,
		[IEEE80211_AC_VO] = 3,
	};
	int ret;
	int i;
	struct mt76_txwi_cache __maybe_unused *t;
	struct mt76_queue *q;

	BUILD_BUG_ON(sizeof(t->txwi) < sizeof(struct mt76x2_txwi));
	BUILD_BUG_ON(sizeof(struct mt76x2_rxwi) > MT_RX_HEADROOM);

	mt76_dma_attach(&dev->mt76);

	init_waitqueue_head(&dev->mcu.wait);
	skb_queue_head_init(&dev->mcu.res_q);

	tasklet_init(&dev->tx_tasklet, mt76x2_tx_tasklet, (unsigned long) dev);

	mt76_wr(dev, MT_WPDMA_RST_IDX, ~0);

	for (i = 0; i < ARRAY_SIZE(wmm_queue_map); i++) {
		ret = mt76x2_init_tx_queue(dev, &dev->mt76.q_tx[i],
					   wmm_queue_map[i], MT_TX_RING_SIZE);
		if (ret)
			return ret;
	}

	ret = mt76x2_init_tx_queue(dev, &dev->mt76.q_tx[MT_TXQ_PSD],
				   MT_TX_HW_QUEUE_MGMT, MT_TX_RING_SIZE);
	if (ret)
		return ret;

	ret = mt76x2_init_tx_queue(dev, &dev->mt76.q_tx[MT_TXQ_MCU],
				   MT_TX_HW_QUEUE_MCU, MT_MCU_RING_SIZE);
	if (ret)
		return ret;

	ret = mt76x2_init_rx_queue(dev, &dev->mt76.q_rx[MT_RXQ_MCU], 1,
				   MT_MCU_RING_SIZE, MT_RX_BUF_SIZE);
	if (ret)
		return ret;

	q = &dev->mt76.q_rx[MT_RXQ_MAIN];
	q->buf_offset = MT_RX_HEADROOM - sizeof(struct mt76x2_rxwi);
	ret = mt76x2_init_rx_queue(dev, q, 0, MT76x2_RX_RING_SIZE, MT_RX_BUF_SIZE);
	if (ret)
		return ret;

	return mt76_init_queues(dev);
}

void mt76x2_dma_cleanup(struct mt76x2_dev *dev)
{
	tasklet_kill(&dev->tx_tasklet);
	mt76_dma_cleanup(&dev->mt76);
}