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37c0ffaad2
This patch works around a recently discovered unaligned receive dma problem with the Altera SGMDA. The Altera SGDMA component cannot be configured to DMA data to unaligned addresses for receive packet operations from the Triple Speed Ethernet component because of a potential data transfer corruption that can occur. This patch addresses this issue by utilizing the shift 16 bits feature of the Altera Triple Speed Ethernet component and modifying the receive buffer physical addresses accordingly such that the target receive DMA address is always aligned on a 32-bit boundary. Signed-off-by: Vince Bridgers <vbridgers2013@gmail.com> Tested-by: Matthew Gerlach <mgerlach@altera.com> Signed-off-by: David S. Miller <davem@davemloft.net>
36 lines
1.6 KiB
C
36 lines
1.6 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_MSGDMA_H__
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#define __ALTERA_MSGDMA_H__
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void msgdma_reset(struct altera_tse_private *);
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void msgdma_enable_txirq(struct altera_tse_private *);
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void msgdma_enable_rxirq(struct altera_tse_private *);
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void msgdma_disable_rxirq(struct altera_tse_private *);
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void msgdma_disable_txirq(struct altera_tse_private *);
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void msgdma_clear_rxirq(struct altera_tse_private *);
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void msgdma_clear_txirq(struct altera_tse_private *);
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u32 msgdma_tx_completions(struct altera_tse_private *);
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void msgdma_add_rx_desc(struct altera_tse_private *, struct tse_buffer *);
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int msgdma_tx_buffer(struct altera_tse_private *, struct tse_buffer *);
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u32 msgdma_rx_status(struct altera_tse_private *);
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int msgdma_initialize(struct altera_tse_private *);
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void msgdma_uninitialize(struct altera_tse_private *);
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void msgdma_start_rxdma(struct altera_tse_private *);
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#endif /* __ALTERA_MSGDMA_H__ */
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