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stmmac: add mixed burst for DMA

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In mixed burst (MB) mode, the AHB master always initiates
the bursts with fixed-size when the DMA requests transfers
of size less than or equal to 16 beats.
This patch adds the MB support and the flag that can be
passed from the platform to select it.
MB mode can also give some benefits in terms of performances
on some platforms.

v2: fixed Coding Style

Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Giuseppe CAVALLARO
2012-05-13 22:18:42 +00:00
committed by David S. Miller
parent cffb13f4d6
commit b9cde0a8be
6 changed files with 13 additions and 5 deletions
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4
drivers/net/ethernet/stmicro/stmmac/common.h
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@@ -247,8 +247,8 @@ struct stmmac_desc_ops {
struct stmmac_dma_ops {
/* DMA core initialization */
int (*init) (void __iomem *ioaddr, int pbl, int fb, int burst_len,
u32 dma_tx, u32 dma_rx);
int (*init) (void __iomem *ioaddr, int pbl, int fb, int mb,
int burst_len, u32 dma_tx, u32 dma_rx);
/* Dump DMA registers */
void (*dump_regs) (void __iomem *ioaddr);
/* Set tx/rx threshold in the csr6 register