diff options
| author | Vince Bridgers <vbridger@altera.com> | 2014-04-24 16:58:08 -0500 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-04-26 12:26:26 -0400 |
| commit | 37c0ffaad21401eacc6618a121cc2c501131026f (patch) | |
| tree | d76882b5f858e65c591d3e10f82ef19167d045f6 /drivers/net/ethernet/altera/altera_msgdma.h | |
| parent | c2163260ea5b6f453b8f940709e40e9cf33255d0 (diff) | |
Altera TSE: Work around unaligned DMA receive packet issue with Altera SGDMA
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>
Diffstat (limited to 'drivers/net/ethernet/altera/altera_msgdma.h')
| -rw-r--r-- | drivers/net/ethernet/altera/altera_msgdma.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/net/ethernet/altera/altera_msgdma.h b/drivers/net/ethernet/altera/altera_msgdma.h index 7f0f5bf2bba2..42cf61c81057 100644 --- a/drivers/net/ethernet/altera/altera_msgdma.h +++ b/drivers/net/ethernet/altera/altera_msgdma.h @@ -25,10 +25,11 @@ void msgdma_disable_txirq(struct altera_tse_private *); void msgdma_clear_rxirq(struct altera_tse_private *); void msgdma_clear_txirq(struct altera_tse_private *); u32 msgdma_tx_completions(struct altera_tse_private *); -int msgdma_add_rx_desc(struct altera_tse_private *, struct tse_buffer *); +void msgdma_add_rx_desc(struct altera_tse_private *, struct tse_buffer *); int msgdma_tx_buffer(struct altera_tse_private *, struct tse_buffer *); u32 msgdma_rx_status(struct altera_tse_private *); int msgdma_initialize(struct altera_tse_private *); void msgdma_uninitialize(struct altera_tse_private *); +void msgdma_start_rxdma(struct altera_tse_private *); #endif /* __ALTERA_MSGDMA_H__ */ |