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/* 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_SGDMAHW_H__
#define __ALTERA_SGDMAHW_H__
/* SGDMA descriptor structure */
struct sgdma_descrip {
u32 raddr; /* address of data to be read */
u32 pad1;
u32 waddr;
u32 pad2;
u32 next;
u32 pad3;
u16 bytes;
u8 rburst;
u8 wburst;
u16 bytes_xferred; /* 16 bits, bytes xferred */
/* bit 0: error
* bit 1: length error
* bit 2: crc error
* bit 3: truncated error
* bit 4: phy error
* bit 5: collision error
* bit 6: reserved
* bit 7: status eop for recv case
*/
u8 status;
/* bit 0: eop
* bit 1: read_fixed
* bit 2: write fixed
* bits 3,4,5,6: Channel (always 0)
* bit 7: hardware owned
*/
u8 control;
} __packed;
#define SGDMA_STATUS_ERR BIT(0)
#define SGDMA_STATUS_LENGTH_ERR BIT(1)
#define SGDMA_STATUS_CRC_ERR BIT(2)
#define SGDMA_STATUS_TRUNC_ERR BIT(3)
#define SGDMA_STATUS_PHY_ERR BIT(4)
#define SGDMA_STATUS_COLL_ERR BIT(5)
#define SGDMA_STATUS_EOP BIT(7)
#define SGDMA_CONTROL_EOP BIT(0)
#define SGDMA_CONTROL_RD_FIXED BIT(1)
#define SGDMA_CONTROL_WR_FIXED BIT(2)
/* Channel is always 0, so just zero initialize it */
#define SGDMA_CONTROL_HW_OWNED BIT(7)
/* SGDMA register space */
struct sgdma_csr {
/* bit 0: error
* bit 1: eop
* bit 2: descriptor completed
* bit 3: chain completed
* bit 4: busy
* remainder reserved
*/
u32 status;
u32 pad1[3];
/* bit 0: interrupt on error
* bit 1: interrupt on eop
* bit 2: interrupt after every descriptor
* bit 3: interrupt after last descrip in a chain
* bit 4: global interrupt enable
* bit 5: starts descriptor processing
* bit 6: stop core on dma error
* bit 7: interrupt on max descriptors
* bits 8-15: max descriptors to generate interrupt
* bit 16: Software reset
* bit 17: clears owned by hardware if 0, does not clear otherwise
* bit 18: enables descriptor polling mode
* bit 19-26: clocks before polling again
* bit 27-30: reserved
* bit 31: clear interrupt
*/
u32 control;
u32 pad2[3];
u32 next_descrip;
u32 pad3[3];
};
#define sgdma_csroffs(a) (offsetof(struct sgdma_csr, a))
#define sgdma_descroffs(a) (offsetof(struct sgdma_descrip, a))
#define SGDMA_STSREG_ERR BIT(0) /* Error */
#define SGDMA_STSREG_EOP BIT(1) /* EOP */
#define SGDMA_STSREG_DESCRIP BIT(2) /* Descriptor completed */
#define SGDMA_STSREG_CHAIN BIT(3) /* Chain completed */
#define SGDMA_STSREG_BUSY BIT(4) /* Controller busy */
#define SGDMA_CTRLREG_IOE BIT(0) /* Interrupt on error */
#define SGDMA_CTRLREG_IOEOP BIT(1) /* Interrupt on EOP */
#define SGDMA_CTRLREG_IDESCRIP BIT(2) /* Interrupt after every descriptor */
#define SGDMA_CTRLREG_ILASTD BIT(3) /* Interrupt after last descriptor */
#define SGDMA_CTRLREG_INTEN BIT(4) /* Global Interrupt enable */
#define SGDMA_CTRLREG_START BIT(5) /* starts descriptor processing */
#define SGDMA_CTRLREG_STOPERR BIT(6) /* stop on dma error */
#define SGDMA_CTRLREG_INTMAX BIT(7) /* Interrupt on max descriptors */
#define SGDMA_CTRLREG_RESET BIT(16)/* Software reset */
#define SGDMA_CTRLREG_COBHW BIT(17)/* Clears owned by hardware */
#define SGDMA_CTRLREG_POLL BIT(18)/* enables descriptor polling mode */
#define SGDMA_CTRLREG_CLRINT BIT(31)/* Clears interrupt */
#endif /* __ALTERA_SGDMAHW_H__ */
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