drivers/net/wireless/mediatek/mt76/mt7603/dma.c

Source file repositories/reference/linux-study-clean/drivers/net/wireless/mediatek/mt76/mt7603/dma.c

File Facts

System
Linux kernel
Corpus path
drivers/net/wireless/mediatek/mt76/mt7603/dma.c
Extension
.c
Size
6281 bytes
Lines
261
Domain
Driver Families
Bucket
drivers/net
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

if (mt7603_mac_fill_rx(dev, skb) == 0) {
			mt76_rx(&dev->mt76, q, skb);
			return;
		}
		fallthrough;
	default:
		dev_kfree_skb(skb);
		break;
	}
}

static int
mt7603_init_rx_queue(struct mt7603_dev *dev, struct mt76_queue *q,
		     int idx, int n_desc, int bufsize)
{
	int err;

	err = mt76_queue_alloc(dev, q, idx, n_desc, bufsize,
			       MT_RX_RING_BASE);
	if (err < 0)
		return err;

	mt7603_irq_enable(dev, MT_INT_RX_DONE(idx));

	return 0;
}

static int mt7603_poll_tx(struct napi_struct *napi, int budget)
{
	struct mt7603_dev *dev;
	int i;

	dev = container_of(napi, struct mt7603_dev, mt76.tx_napi);
	dev->tx_dma_check = 0;

	mt76_queue_tx_cleanup(dev, dev->mt76.q_mcu[MT_MCUQ_WM], false);
	for (i = MT_TXQ_PSD; i >= 0; i--)
		mt76_queue_tx_cleanup(dev, dev->mphy.q_tx[i], false);

	if (napi_complete_done(napi, 0))
		mt7603_irq_enable(dev, MT_INT_TX_DONE_ALL);

	mt76_queue_tx_cleanup(dev, dev->mt76.q_mcu[MT_MCUQ_WM], false);
	for (i = MT_TXQ_PSD; i >= 0; i--)
		mt76_queue_tx_cleanup(dev, dev->mphy.q_tx[i], false);

	mt7603_mac_sta_poll(dev);

	mt76_worker_schedule(&dev->mt76.tx_worker);

	return 0;
}

int mt7603_dma_init(struct mt7603_dev *dev)
{
	int ret;
	int i;

	mt76_dma_attach(&dev->mt76);

	mt76_clear(dev, MT_WPDMA_GLO_CFG,
		   MT_WPDMA_GLO_CFG_TX_DMA_EN |
		   MT_WPDMA_GLO_CFG_RX_DMA_EN |
		   MT_WPDMA_GLO_CFG_DMA_BURST_SIZE |
		   MT_WPDMA_GLO_CFG_TX_WRITEBACK_DONE);

	mt76_wr(dev, MT_WPDMA_RST_IDX, ~0);
	mt7603_pse_client_reset(dev);

	for (i = 0; i < ARRAY_SIZE(wmm_queue_map); i++) {
		ret = mt76_init_tx_queue(&dev->mphy, i, wmm_queue_map[i],
					 MT7603_TX_RING_SIZE, MT_TX_RING_BASE,
					 NULL, 0);
		if (ret)
			return ret;
	}

	ret = mt76_init_tx_queue(&dev->mphy, MT_TXQ_PSD, MT_TX_HW_QUEUE_MGMT,
				 MT7603_PSD_RING_SIZE, MT_TX_RING_BASE, NULL, 0);
	if (ret)
		return ret;

	ret = mt76_init_mcu_queue(&dev->mt76, MT_MCUQ_WM, MT_TX_HW_QUEUE_MCU,
				  MT_MCU_RING_SIZE, MT_TX_RING_BASE);
	if (ret)
		return ret;

	ret = mt76_init_tx_queue(&dev->mphy, MT_TXQ_BEACON, MT_TX_HW_QUEUE_BCN,
				 MT_MCU_RING_SIZE, MT_TX_RING_BASE, NULL, 0);
	if (ret)

Annotation

Implementation Notes