drivers/net/wireless/mediatek/mt76/dma.h

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

File Facts

System
Linux kernel
Corpus path
drivers/net/wireless/mediatek/mt76/dma.h
Extension
.h
Size
5336 bytes
Lines
217
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

struct mt76_desc {
	__le32 buf0;
	__le32 ctrl;
	__le32 buf1;
	__le32 info;
} __packed __aligned(4);

struct mt76_wed_rro_desc {
	__le32 buf0;
	__le32 buf1;
} __packed __aligned(4);

/* data1 */
#define RRO_RXDMAD_DATA1_LS_MASK		BIT(30)
#define RRO_RXDMAD_DATA1_SDL0_MASK		GENMASK(29, 16)
/* data2 */
#define RRO_RXDMAD_DATA2_RX_TOKEN_ID_MASK	GENMASK(31, 16)
#define RRO_RXDMAD_DATA2_IND_REASON_MASK	GENMASK(15, 12)
/* data3 */
#define RRO_RXDMAD_DATA3_MAGIC_CNT_MASK		GENMASK(31, 28)
struct mt76_rro_rxdmad_c {
	__le32 data0;
	__le32 data1;
	__le32 data2;
	__le32 data3;
};

enum mt76_qsel {
	MT_QSEL_MGMT,
	MT_QSEL_HCCA,
	MT_QSEL_EDCA,
	MT_QSEL_EDCA_2,
};

enum mt76_mcu_evt_type {
	EVT_CMD_DONE,
	EVT_CMD_ERROR,
	EVT_CMD_RETRY,
	EVT_EVENT_PWR_RSP,
	EVT_EVENT_WOW_RSP,
	EVT_EVENT_CARRIER_DETECT_RSP,
	EVT_EVENT_DFS_DETECT_RSP,
};

enum mt76_dma_wed_ind_reason {
	MT_DMA_WED_IND_REASON_NORMAL,
	MT_DMA_WED_IND_REASON_REPEAT,
	MT_DMA_WED_IND_REASON_OLDPKT,
};

int mt76_dma_rx_poll(struct napi_struct *napi, int budget);
void mt76_dma_attach(struct mt76_dev *dev);
void mt76_dma_cleanup(struct mt76_dev *dev);
int mt76_dma_rx_fill(struct mt76_dev *dev, struct mt76_queue *q,
		     bool allow_direct);
void mt76_dma_queue_reset(struct mt76_dev *dev, struct mt76_queue *q,
			  bool reset_idx);

static inline void
mt76_dma_reset_tx_queue(struct mt76_dev *dev, struct mt76_queue *q)
{
	bool reset_idx = q && !mt76_queue_is_npu_tx(q);

	dev->queue_ops->reset_q(dev, q, reset_idx);
	if (mtk_wed_device_active(&dev->mmio.wed))
		mt76_wed_dma_setup(dev, q, true);
}

static inline void
mt76_dma_should_drop_buf(bool *drop, u32 ctrl, u32 buf1, u32 info)
{
	if (!drop)
		return;

	*drop = !!(ctrl & (MT_DMA_CTL_TO_HOST_A | MT_DMA_CTL_DROP));
	if (!(ctrl & MT_DMA_CTL_VER_MASK))
		return;

	switch (FIELD_GET(MT_DMA_WED_IND_REASON, buf1)) {
	case MT_DMA_WED_IND_REASON_REPEAT:
		*drop = true;
		break;
	case MT_DMA_WED_IND_REASON_OLDPKT:
		*drop = !(info & MT_DMA_INFO_DMA_FRAG);
		break;
	default:
		*drop = !!(ctrl & MT_DMA_CTL_PN_CHK_FAIL);
		break;
	}
}

Annotation

Implementation Notes