linux/drivers/net/ethernet/altera/altera_msgdmahw.h

/* Altera TSE SGDMA and MSGDMA Linux driver
 * Copyright (C) 2014 Altera Corporation. All rights reserved
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef __ALTERA_MSGDMAHW_H__
#define __ALTERA_MSGDMAHW_H__

/* mSGDMA extended descriptor format
 */
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_TR_ERR_IRQ |	\
					 MSGDMA_DESC_CTL_GO)

#define MSGDMA_DESC_CTL_TX_MIDDLE	(MSGDMA_DESC_CTL_TR_ERR_IRQ |	\
					 MSGDMA_DESC_CTL_GO)

#define MSGDMA_DESC_CTL_TX_LAST		(MSGDMA_DESC_CTL_GEN_EOP |	\
					 MSGDMA_DESC_CTL_TR_COMP_IRQ |	\
					 MSGDMA_DESC_CTL_TR_ERR_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_TR_ERR_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)
#define MSGDMA_CSR_STAT_IRQ			BIT(9)
#define MSGDMA_CSR_STAT_MASK			0x3FF
#define MSGDMA_CSR_STAT_MASK_WITHOUT_IRQ	0x1FF

#define MSGDMA_CSR_STAT_BUSY_GET(v)			GET_BIT_VALUE(v, 0)
#define MSGDMA_CSR_STAT_DESC_BUF_EMPTY_GET(v)		GET_BIT_VALUE(v, 1)
#define MSGDMA_CSR_STAT_DESC_BUF_FULL_GET(v)		GET_BIT_VALUE(v, 2)
#define MSGDMA_CSR_STAT_RESP_BUF_EMPTY_GET(v)		GET_BIT_VALUE(v, 3)
#define MSGDMA_CSR_STAT_RESP_BUF_FULL_GET(v)		GET_BIT_VALUE(v, 4)
#define MSGDMA_CSR_STAT_STOPPED_GET(v)			GET_BIT_VALUE(v, 5)
#define MSGDMA_CSR_STAT_RESETTING_GET(v)		GET_BIT_VALUE(v, 6)
#define MSGDMA_CSR_STAT_STOPPED_ON_ERR_GET(v)		GET_BIT_VALUE(v, 7)
#define MSGDMA_CSR_STAT_STOPPED_ON_EARLY_GET(v)		GET_BIT_VALUE(v, 8)
#define MSGDMA_CSR_STAT_IRQ_GET(v)			GET_BIT_VALUE(v, 9)

/* mSGDMA CSR control register bit definitions
 */
#define MSGDMA_CSR_CTL_STOP			BIT(0)
#define MSGDMA_CSR_CTL_RESET			BIT(1)
#define MSGDMA_CSR_CTL_STOP_ON_ERR		BIT(2)
#define MSGDMA_CSR_CTL_STOP_ON_EARLY		BIT(3)
#define MSGDMA_CSR_CTL_GLOBAL_INTR		BIT(4)
#define MSGDMA_CSR_CTL_STOP_DESCS		BIT(5)

/* mSGDMA CSR fill level bits
 */
#define MSGDMA_CSR_WR_FILL_LEVEL_GET(v)		(((v) & 0xffff0000) >> 16)
#define MSGDMA_CSR_RD_FILL_LEVEL_GET(v)		((v) & 0x0000ffff)
#define MSGDMA_CSR_RESP_FILL_LEVEL_GET(v)	((v) & 0x0000ffff)

/* mSGDMA response register map
 */
struct msgdma_response {
	u32 bytes_transferred;
	u32 status;
};

#define msgdma_respoffs(a) (offsetof(struct msgdma_response, a))
#define msgdma_csroffs(a) (offsetof(struct msgdma_csr, a))
#define msgdma_descroffs(a) (offsetof(struct msgdma_extended_desc, a))

/* mSGDMA response register bit definitions
 */
#define MSGDMA_RESP_EARLY_TERM	BIT(8)
#define MSGDMA_RESP_ERR_MASK	0xFF

#endif /* __ALTERA_MSGDMA_H__*/