drivers/net/ethernet/altera/altera_msgdmahw.h

Source file repositories/reference/linux-study-clean/drivers/net/ethernet/altera/altera_msgdmahw.h

File Facts

System
Linux kernel
Corpus path
drivers/net/ethernet/altera/altera_msgdmahw.h
Extension
.h
Size
4988 bytes
Lines
148
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 msgdma_extended_desc {
	u32 read_addr_lo;	/* data buffer source address low bits */
	u32 write_addr_lo;	/* data buffer destination address low bits */
	u32 len;		/* the number of bytes to transfer
				 * per descriptor
				 */
	u32 burst_seq_num;	/* bit 31:24 write burst
				 * bit 23:16 read burst
				 * bit 15:0  sequence number
				 */
	u32 stride;		/* bit 31:16 write stride
				 * bit 15:0  read stride
				 */
	u32 read_addr_hi;	/* data buffer source address high bits */
	u32 write_addr_hi;	/* data buffer destination address high bits */
	u32 control;		/* characteristics of the transfer */
};

/* mSGDMA descriptor control field bit definitions
 */
#define MSGDMA_DESC_CTL_SET_CH(x)	((x) & 0xff)
#define MSGDMA_DESC_CTL_GEN_SOP		BIT(8)
#define MSGDMA_DESC_CTL_GEN_EOP		BIT(9)
#define MSGDMA_DESC_CTL_PARK_READS	BIT(10)
#define MSGDMA_DESC_CTL_PARK_WRITES	BIT(11)
#define MSGDMA_DESC_CTL_END_ON_EOP	BIT(12)
#define MSGDMA_DESC_CTL_END_ON_LEN	BIT(13)
#define MSGDMA_DESC_CTL_TR_COMP_IRQ	BIT(14)
#define MSGDMA_DESC_CTL_EARLY_IRQ	BIT(15)
#define MSGDMA_DESC_CTL_TR_ERR_IRQ	(0xff << 16)
#define MSGDMA_DESC_CTL_EARLY_DONE	BIT(24)
/* Writing ‘1’ to the ‘go’ bit commits the entire descriptor into the
 * descriptor FIFO(s)
 */
#define MSGDMA_DESC_CTL_GO		BIT(31)

/* Tx buffer control flags
 */
#define MSGDMA_DESC_CTL_TX_FIRST	(MSGDMA_DESC_CTL_GEN_SOP |	\
					 MSGDMA_DESC_CTL_GO)

#define MSGDMA_DESC_CTL_TX_MIDDLE	(MSGDMA_DESC_CTL_GO)

#define MSGDMA_DESC_CTL_TX_LAST		(MSGDMA_DESC_CTL_GEN_EOP |	\
					 MSGDMA_DESC_CTL_TR_COMP_IRQ |	\
					 MSGDMA_DESC_CTL_GO)

#define MSGDMA_DESC_CTL_TX_SINGLE	(MSGDMA_DESC_CTL_GEN_SOP |	\
					 MSGDMA_DESC_CTL_GEN_EOP |	\
					 MSGDMA_DESC_CTL_TR_COMP_IRQ |	\
					 MSGDMA_DESC_CTL_GO)

#define MSGDMA_DESC_CTL_RX_SINGLE	(MSGDMA_DESC_CTL_END_ON_EOP |	\
					 MSGDMA_DESC_CTL_END_ON_LEN |	\
					 MSGDMA_DESC_CTL_TR_COMP_IRQ |	\
					 MSGDMA_DESC_CTL_EARLY_IRQ |	\
					 MSGDMA_DESC_CTL_TR_ERR_IRQ |	\
					 MSGDMA_DESC_CTL_GO)

/* mSGDMA extended descriptor stride definitions
 */
#define MSGDMA_DESC_TX_STRIDE		(0x00010001)
#define MSGDMA_DESC_RX_STRIDE		(0x00010001)

/* mSGDMA dispatcher control and status register map
 */
struct msgdma_csr {
	u32 status;		/* Read/Clear */
	u32 control;		/* Read/Write */
	u32 rw_fill_level;	/* bit 31:16 - write fill level
				 * bit 15:0  - read fill level
				 */
	u32 resp_fill_level;	/* bit 15:0 */
	u32 rw_seq_num;		/* bit 31:16 - write sequence number
				 * bit 15:0  - read sequence number
				 */
	u32 pad[3];		/* reserved */
};

/* mSGDMA CSR status register bit definitions
 */
#define MSGDMA_CSR_STAT_BUSY			BIT(0)
#define MSGDMA_CSR_STAT_DESC_BUF_EMPTY		BIT(1)
#define MSGDMA_CSR_STAT_DESC_BUF_FULL		BIT(2)
#define MSGDMA_CSR_STAT_RESP_BUF_EMPTY		BIT(3)
#define MSGDMA_CSR_STAT_RESP_BUF_FULL		BIT(4)
#define MSGDMA_CSR_STAT_STOPPED			BIT(5)
#define MSGDMA_CSR_STAT_RESETTING		BIT(6)
#define MSGDMA_CSR_STAT_STOPPED_ON_ERR		BIT(7)
#define MSGDMA_CSR_STAT_STOPPED_ON_EARLY	BIT(8)

Annotation

Implementation Notes