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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2017-04-12 13:27:08 +1000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-04-12 10:17:02 -0400 |
| commit | 3833dc6c1888cfd872b9ce2e3c70a4f07f1a6f9a (patch) | |
| tree | 87ec102b158487a9f3479e00e3ea7779d0ab9528 | |
| parent | 8eecf7caad8687eae2812fc6467f156a8909eb12 (diff) | |
| download | linux-3833dc6c1888cfd872b9ce2e3c70a4f07f1a6f9a.tar.gz | |
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 <benh@kernel.crashing.org> Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/ethernet/faraday/ftgmac100.c | 36 |
1 files changed, 36 insertions, 0 deletions
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) |