94fe8c683c
This patch adds support for RX and TX DMA via the DMA API, this is only supported when the KS8842 is accessed via timberdale. There is no support for DMA on the generic bus interface it self, a state machine inside the FPGA is handling RX and TX transfers to/from buffers in the FPGA. The host CPU can do DMA to and from these buffers. The FPGA has to handle the RX interrupts, so these must be enabled in the ks8842 but not in the FPGA. The driver must not disable the RX interrupt that would mean that the data transfers into the FPGA buffers would stop. The host shall not enable TX interrupts since TX is handled by the FPGA, the host is notified by DMA callbacks when transfers are finished. Which DMA channels to use are added as parameters in the platform data struct. Signed-off-by: Richard Röjfors <richard.rojfors@pelagicore.com> Signed-off-by: David S. Miller <davem@davemloft.net>
38 lines
1.2 KiB
C
38 lines
1.2 KiB
C
/*
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* ks8842.h KS8842 platform data struct definition
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* Copyright (c) 2010 Intel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef _LINUX_KS8842_H
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#define _LINUX_KS8842_H
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#include <linux/if_ether.h>
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/**
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* struct ks8842_platform_data - Platform data of the KS8842 network driver
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* @macaddr: The MAC address of the device, set to all 0:s to use the on in
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* the chip.
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* @rx_dma_channel: The DMA channel to use for RX, -1 for none.
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* @tx_dma_channel: The DMA channel to use for TX, -1 for none.
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*
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*/
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struct ks8842_platform_data {
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u8 macaddr[ETH_ALEN];
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int rx_dma_channel;
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int tx_dma_channel;
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};
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#endif
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