diff options
Diffstat (limited to 'drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c')
| -rw-r--r-- | drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c | 26 |
1 files changed, 25 insertions, 1 deletions
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c index 59d92e811750..0e8937c1184a 100644 --- a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c @@ -106,8 +106,29 @@ static int dwmac1000_dma_init(void __iomem *ioaddr, int pbl, int fb, int mb, return 0; } +static u32 dwmac1000_configure_fc(u32 csr6, int rxfifosz) +{ + csr6 &= ~DMA_CONTROL_RFA_MASK; + csr6 &= ~DMA_CONTROL_RFD_MASK; + + /* Leave flow control disabled if receive fifo size is less than + * 4K or 0. Otherwise, send XOFF when fifo is 1K less than full, + * and send XON when 2K less than full. + */ + if (rxfifosz < 4096) { + csr6 &= ~DMA_CONTROL_EFC; + pr_debug("GMAC: disabling flow control, rxfifo too small(%d)\n", + rxfifosz); + } else { + csr6 |= DMA_CONTROL_EFC; + csr6 |= RFA_FULL_MINUS_1K; + csr6 |= RFD_FULL_MINUS_2K; + } + return csr6; +} + static void dwmac1000_dma_operation_mode(void __iomem *ioaddr, int txmode, - int rxmode) + int rxmode, int rxfifosz) { u32 csr6 = readl(ioaddr + DMA_CONTROL); @@ -153,6 +174,9 @@ static void dwmac1000_dma_operation_mode(void __iomem *ioaddr, int txmode, csr6 |= DMA_CONTROL_RTC_128; } + /* Configure flow control based on rx fifo size */ + csr6 = dwmac1000_configure_fc(csr6, rxfifosz); + writel(csr6, ioaddr + DMA_CONTROL); } |