127 lines
3.8 KiB
C
127 lines
3.8 KiB
C
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/* Altera TSE SGDMA and MSGDMA Linux driver
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* Copyright (C) 2014 Altera Corporation. All rights reserved
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ALTERA_SGDMAHW_H__
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#define __ALTERA_SGDMAHW_H__
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/* SGDMA descriptor structure */
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struct sgdma_descrip {
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u32 raddr; /* address of data to be read */
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u32 pad1;
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u32 waddr;
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u32 pad2;
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u32 next;
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u32 pad3;
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u16 bytes;
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u8 rburst;
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u8 wburst;
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u16 bytes_xferred; /* 16 bits, bytes xferred */
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/* bit 0: error
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* bit 1: length error
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* bit 2: crc error
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* bit 3: truncated error
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* bit 4: phy error
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* bit 5: collision error
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* bit 6: reserved
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* bit 7: status eop for recv case
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*/
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u8 status;
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/* bit 0: eop
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* bit 1: read_fixed
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* bit 2: write fixed
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* bits 3,4,5,6: Channel (always 0)
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* bit 7: hardware owned
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*/
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u8 control;
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} __packed;
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#define SGDMA_STATUS_ERR BIT(0)
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#define SGDMA_STATUS_LENGTH_ERR BIT(1)
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#define SGDMA_STATUS_CRC_ERR BIT(2)
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#define SGDMA_STATUS_TRUNC_ERR BIT(3)
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#define SGDMA_STATUS_PHY_ERR BIT(4)
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#define SGDMA_STATUS_COLL_ERR BIT(5)
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#define SGDMA_STATUS_EOP BIT(7)
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#define SGDMA_CONTROL_EOP BIT(0)
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#define SGDMA_CONTROL_RD_FIXED BIT(1)
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#define SGDMA_CONTROL_WR_FIXED BIT(2)
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/* Channel is always 0, so just zero initialize it */
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#define SGDMA_CONTROL_HW_OWNED BIT(7)
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/* SGDMA register space */
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struct sgdma_csr {
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/* bit 0: error
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* bit 1: eop
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* bit 2: descriptor completed
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* bit 3: chain completed
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* bit 4: busy
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* remainder reserved
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*/
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u32 status;
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u32 pad1[3];
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/* bit 0: interrupt on error
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* bit 1: interrupt on eop
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* bit 2: interrupt after every descriptor
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* bit 3: interrupt after last descrip in a chain
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* bit 4: global interrupt enable
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* bit 5: starts descriptor processing
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* bit 6: stop core on dma error
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* bit 7: interrupt on max descriptors
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* bits 8-15: max descriptors to generate interrupt
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* bit 16: Software reset
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* bit 17: clears owned by hardware if 0, does not clear otherwise
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* bit 18: enables descriptor polling mode
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* bit 19-26: clocks before polling again
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* bit 27-30: reserved
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* bit 31: clear interrupt
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*/
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u32 control;
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u32 pad2[3];
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u32 next_descrip;
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u32 pad3[3];
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};
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#define sgdma_csroffs(a) (offsetof(struct sgdma_csr, a))
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#define sgdma_descroffs(a) (offsetof(struct sgdma_descrip, a))
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#define SGDMA_STSREG_ERR BIT(0) /* Error */
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#define SGDMA_STSREG_EOP BIT(1) /* EOP */
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#define SGDMA_STSREG_DESCRIP BIT(2) /* Descriptor completed */
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#define SGDMA_STSREG_CHAIN BIT(3) /* Chain completed */
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#define SGDMA_STSREG_BUSY BIT(4) /* Controller busy */
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#define SGDMA_CTRLREG_IOE BIT(0) /* Interrupt on error */
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#define SGDMA_CTRLREG_IOEOP BIT(1) /* Interrupt on EOP */
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#define SGDMA_CTRLREG_IDESCRIP BIT(2) /* Interrupt after every descriptor */
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#define SGDMA_CTRLREG_ILASTD BIT(3) /* Interrupt after last descriptor */
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#define SGDMA_CTRLREG_INTEN BIT(4) /* Global Interrupt enable */
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#define SGDMA_CTRLREG_START BIT(5) /* starts descriptor processing */
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#define SGDMA_CTRLREG_STOPERR BIT(6) /* stop on dma error */
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#define SGDMA_CTRLREG_INTMAX BIT(7) /* Interrupt on max descriptors */
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#define SGDMA_CTRLREG_RESET BIT(16)/* Software reset */
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#define SGDMA_CTRLREG_COBHW BIT(17)/* Clears owned by hardware */
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#define SGDMA_CTRLREG_POLL BIT(18)/* enables descriptor polling mode */
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#define SGDMA_CTRLREG_CLRINT BIT(31)/* Clears interrupt */
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#endif /* __ALTERA_SGDMAHW_H__ */
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