From: Benjamin Herrenschmidt Date: Wed, 12 Apr 2017 03:27:08 +0000 (+1000) Subject: ftgmac100: Add more register inits in ftgmac100_init_hw() X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=3833dc6c1888cfd872b9ce2e3c70a4f07f1a6f9a;p=openwrt%2Fstaging%2Fblogic.git ftgmac100: Add more register inits in ftgmac100_init_hw() Clear stale interrupts on entry, configure FIFO sizes, set FIFO thresholds, configure interrupt mitigation. Signed-off-by: Benjamin Herrenschmidt Signed-off-by: David S. Miller --- diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/ethernet/faraday/ftgmac100.c index f14700f67d67..49c19b786122 100644 --- a/drivers/net/ethernet/faraday/ftgmac100.c +++ b/drivers/net/ethernet/faraday/ftgmac100.c @@ -212,7 +212,11 @@ static int ftgmac100_set_mac_addr(struct net_device *dev, void *p) static void ftgmac100_init_hw(struct ftgmac100 *priv) { + u32 reg, rfifo_sz, tfifo_sz; + /* Clear stale interrupts */ + reg = ioread32(priv->base + FTGMAC100_OFFSET_ISR); + iowrite32(reg, priv->base + FTGMAC100_OFFSET_ISR); /* Setup RX ring buffer base */ iowrite32(priv->descs_dma_addr + @@ -234,6 +238,38 @@ static void ftgmac100_init_hw(struct ftgmac100 *priv) /* Write MAC address */ ftgmac100_write_mac_addr(priv, priv->netdev->dev_addr); + + /* Configure descriptor sizes and increase burst sizes according + * to values in Aspeed SDK. The FIFO arbitration is enabled and + * the thresholds set based on the recommended values in the + * AST2400 specification. + */ + iowrite32(FTGMAC100_DBLAC_RXDES_SIZE(2) | /* 2*8 bytes RX descs */ + FTGMAC100_DBLAC_TXDES_SIZE(2) | /* 2*8 bytes TX descs */ + FTGMAC100_DBLAC_RXBURST_SIZE(3) | /* 512 bytes max RX bursts */ + FTGMAC100_DBLAC_TXBURST_SIZE(3) | /* 512 bytes max TX bursts */ + FTGMAC100_DBLAC_RX_THR_EN | /* Enable fifo threshold arb */ + FTGMAC100_DBLAC_RXFIFO_HTHR(6) | /* 6/8 of FIFO high threshold */ + FTGMAC100_DBLAC_RXFIFO_LTHR(2), /* 2/8 of FIFO low threshold */ + priv->base + FTGMAC100_OFFSET_DBLAC); + + /* Interrupt mitigation configured for 1 interrupt/packet. HW interrupt + * mitigation doesn't seem to provide any benefit with NAPI so leave + * it at that. + */ + iowrite32(FTGMAC100_ITC_RXINT_THR(1) | + FTGMAC100_ITC_TXINT_THR(1), + priv->base + FTGMAC100_OFFSET_ITC); + + /* Configure FIFO sizes in the TPAFCR register */ + reg = ioread32(priv->base + FTGMAC100_OFFSET_FEAR); + rfifo_sz = reg & 0x00000007; + tfifo_sz = (reg >> 3) & 0x00000007; + reg = ioread32(priv->base + FTGMAC100_OFFSET_TPAFCR); + reg &= ~0x3f000000; + reg |= (tfifo_sz << 27); + reg |= (rfifo_sz << 24); + iowrite32(reg, priv->base + FTGMAC100_OFFSET_TPAFCR); } static void ftgmac100_start_hw(struct ftgmac100 *priv)