mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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20d96964b5
This patch resolves false errors from MSGDMA in TX mSGDMA MM to ST
mode, and is a continuation of the patch recently submitted by Andrea
Oetken. The MSGDMA had a logic bug that masked detection of this issue
prior to Quartus 14.1/Build 164. When the MSGDMA logic bug was addressed
in Quartus 14.1/Build 164, the driver problem was exposed.
The problem is corrected by making sure MSGDMA_DESC_CTL_TR_ERR_IRQ is not
set for any of the transmit DMA descriptors, and only used for receive
descriptors.
Fixes: 71cd26e altera tse: Error-Bit on tx-avalon-stream always set.
Signed-off-by: Chee Nouk Phoon <cnphoon@altera.com>
Signed-off-by: Vince Bridgers <vbridger@opensource.altera.com>a
Cc: Andreas Oetken <ennoerlangen@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
159 lines
5.4 KiB
C
159 lines
5.4 KiB
C
/* 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_MSGDMAHW_H__
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#define __ALTERA_MSGDMAHW_H__
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/* mSGDMA extended descriptor format
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*/
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struct msgdma_extended_desc {
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u32 read_addr_lo; /* data buffer source address low bits */
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u32 write_addr_lo; /* data buffer destination address low bits */
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u32 len; /* the number of bytes to transfer
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* per descriptor
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*/
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u32 burst_seq_num; /* bit 31:24 write burst
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* bit 23:16 read burst
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* bit 15:0 sequence number
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*/
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u32 stride; /* bit 31:16 write stride
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* bit 15:0 read stride
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*/
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u32 read_addr_hi; /* data buffer source address high bits */
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u32 write_addr_hi; /* data buffer destination address high bits */
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u32 control; /* characteristics of the transfer */
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};
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/* mSGDMA descriptor control field bit definitions
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*/
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#define MSGDMA_DESC_CTL_SET_CH(x) ((x) & 0xff)
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#define MSGDMA_DESC_CTL_GEN_SOP BIT(8)
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#define MSGDMA_DESC_CTL_GEN_EOP BIT(9)
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#define MSGDMA_DESC_CTL_PARK_READS BIT(10)
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#define MSGDMA_DESC_CTL_PARK_WRITES BIT(11)
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#define MSGDMA_DESC_CTL_END_ON_EOP BIT(12)
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#define MSGDMA_DESC_CTL_END_ON_LEN BIT(13)
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#define MSGDMA_DESC_CTL_TR_COMP_IRQ BIT(14)
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#define MSGDMA_DESC_CTL_EARLY_IRQ BIT(15)
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#define MSGDMA_DESC_CTL_TR_ERR_IRQ (0xff << 16)
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#define MSGDMA_DESC_CTL_EARLY_DONE BIT(24)
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/* Writing ‘1’ to the ‘go’ bit commits the entire descriptor into the
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* descriptor FIFO(s)
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*/
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#define MSGDMA_DESC_CTL_GO BIT(31)
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/* Tx buffer control flags
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*/
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#define MSGDMA_DESC_CTL_TX_FIRST (MSGDMA_DESC_CTL_GEN_SOP | \
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MSGDMA_DESC_CTL_GO)
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#define MSGDMA_DESC_CTL_TX_MIDDLE (MSGDMA_DESC_CTL_GO)
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#define MSGDMA_DESC_CTL_TX_LAST (MSGDMA_DESC_CTL_GEN_EOP | \
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MSGDMA_DESC_CTL_TR_COMP_IRQ | \
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MSGDMA_DESC_CTL_GO)
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#define MSGDMA_DESC_CTL_TX_SINGLE (MSGDMA_DESC_CTL_GEN_SOP | \
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MSGDMA_DESC_CTL_GEN_EOP | \
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MSGDMA_DESC_CTL_TR_COMP_IRQ | \
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MSGDMA_DESC_CTL_GO)
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#define MSGDMA_DESC_CTL_RX_SINGLE (MSGDMA_DESC_CTL_END_ON_EOP | \
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MSGDMA_DESC_CTL_END_ON_LEN | \
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MSGDMA_DESC_CTL_TR_COMP_IRQ | \
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MSGDMA_DESC_CTL_EARLY_IRQ | \
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MSGDMA_DESC_CTL_TR_ERR_IRQ | \
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MSGDMA_DESC_CTL_GO)
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/* mSGDMA extended descriptor stride definitions
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*/
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#define MSGDMA_DESC_TX_STRIDE (0x00010001)
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#define MSGDMA_DESC_RX_STRIDE (0x00010001)
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/* mSGDMA dispatcher control and status register map
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*/
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struct msgdma_csr {
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u32 status; /* Read/Clear */
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u32 control; /* Read/Write */
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u32 rw_fill_level; /* bit 31:16 - write fill level
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* bit 15:0 - read fill level
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*/
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u32 resp_fill_level; /* bit 15:0 */
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u32 rw_seq_num; /* bit 31:16 - write sequence number
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* bit 15:0 - read sequence number
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*/
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u32 pad[3]; /* reserved */
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};
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/* mSGDMA CSR status register bit definitions
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*/
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#define MSGDMA_CSR_STAT_BUSY BIT(0)
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#define MSGDMA_CSR_STAT_DESC_BUF_EMPTY BIT(1)
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#define MSGDMA_CSR_STAT_DESC_BUF_FULL BIT(2)
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#define MSGDMA_CSR_STAT_RESP_BUF_EMPTY BIT(3)
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#define MSGDMA_CSR_STAT_RESP_BUF_FULL BIT(4)
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#define MSGDMA_CSR_STAT_STOPPED BIT(5)
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#define MSGDMA_CSR_STAT_RESETTING BIT(6)
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#define MSGDMA_CSR_STAT_STOPPED_ON_ERR BIT(7)
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#define MSGDMA_CSR_STAT_STOPPED_ON_EARLY BIT(8)
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#define MSGDMA_CSR_STAT_IRQ BIT(9)
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#define MSGDMA_CSR_STAT_MASK 0x3FF
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#define MSGDMA_CSR_STAT_MASK_WITHOUT_IRQ 0x1FF
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#define MSGDMA_CSR_STAT_BUSY_GET(v) GET_BIT_VALUE(v, 0)
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#define MSGDMA_CSR_STAT_DESC_BUF_EMPTY_GET(v) GET_BIT_VALUE(v, 1)
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#define MSGDMA_CSR_STAT_DESC_BUF_FULL_GET(v) GET_BIT_VALUE(v, 2)
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#define MSGDMA_CSR_STAT_RESP_BUF_EMPTY_GET(v) GET_BIT_VALUE(v, 3)
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#define MSGDMA_CSR_STAT_RESP_BUF_FULL_GET(v) GET_BIT_VALUE(v, 4)
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#define MSGDMA_CSR_STAT_STOPPED_GET(v) GET_BIT_VALUE(v, 5)
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#define MSGDMA_CSR_STAT_RESETTING_GET(v) GET_BIT_VALUE(v, 6)
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#define MSGDMA_CSR_STAT_STOPPED_ON_ERR_GET(v) GET_BIT_VALUE(v, 7)
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#define MSGDMA_CSR_STAT_STOPPED_ON_EARLY_GET(v) GET_BIT_VALUE(v, 8)
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#define MSGDMA_CSR_STAT_IRQ_GET(v) GET_BIT_VALUE(v, 9)
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/* mSGDMA CSR control register bit definitions
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*/
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#define MSGDMA_CSR_CTL_STOP BIT(0)
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#define MSGDMA_CSR_CTL_RESET BIT(1)
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#define MSGDMA_CSR_CTL_STOP_ON_ERR BIT(2)
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#define MSGDMA_CSR_CTL_STOP_ON_EARLY BIT(3)
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#define MSGDMA_CSR_CTL_GLOBAL_INTR BIT(4)
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#define MSGDMA_CSR_CTL_STOP_DESCS BIT(5)
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/* mSGDMA CSR fill level bits
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*/
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#define MSGDMA_CSR_WR_FILL_LEVEL_GET(v) (((v) & 0xffff0000) >> 16)
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#define MSGDMA_CSR_RD_FILL_LEVEL_GET(v) ((v) & 0x0000ffff)
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#define MSGDMA_CSR_RESP_FILL_LEVEL_GET(v) ((v) & 0x0000ffff)
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/* mSGDMA response register map
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*/
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struct msgdma_response {
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u32 bytes_transferred;
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u32 status;
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};
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#define msgdma_respoffs(a) (offsetof(struct msgdma_response, a))
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#define msgdma_csroffs(a) (offsetof(struct msgdma_csr, a))
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#define msgdma_descroffs(a) (offsetof(struct msgdma_extended_desc, a))
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/* mSGDMA response register bit definitions
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*/
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#define MSGDMA_RESP_EARLY_TERM BIT(8)
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#define MSGDMA_RESP_ERR_MASK 0xFF
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#endif /* __ALTERA_MSGDMA_H__*/
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