The EMAC syscon has configurable RX/TX delay chains for use with RGMII PHYs.
This adds support for configuring them via device tree properties. The property names and format were defined in Linux's dwmac-sun8i binding that was merged at one point.
Signed-off-by: Chen-Yu Tsai wens@csie.org --- drivers/net/sun8i_emac.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+)
diff --git a/drivers/net/sun8i_emac.c b/drivers/net/sun8i_emac.c index 09bbb2cdb5ca..5fa1b4c170d7 100644 --- a/drivers/net/sun8i_emac.c +++ b/drivers/net/sun8i_emac.c @@ -56,6 +56,10 @@ #define H3_EPHY_SELECT BIT(15) /* 1: internal PHY, 0: external PHY */
#define SC_RMII_EN BIT(13) +#define SC_TXDC_SHIFT 10 +#define SC_TXDC_MASK GENMASK(2, 0) +#define SC_RXDC_SHIFT 5 +#define SC_RXDC_MASK GENMASK(4, 0) #define SC_EPIT BIT(2) /* 1: RGMII, 0: MII */ #define SC_ETCS_MASK GENMASK(1, 0) #define SC_ETCS_EXT_GMII 0x1 @@ -125,6 +129,8 @@ struct emac_eth_dev { u32 addr; u32 tx_slot; bool use_internal_phy; + u32 tx_delay; + u32 rx_delay;
enum emac_variant variant; void *mac_reg; @@ -290,6 +296,12 @@ static int sun8i_emac_set_syscon(struct emac_eth_dev *priv) if (priv->variant == H3_EMAC || priv->variant == A64_EMAC) reg &= ~SC_RMII_EN;
+ /* Configure RX/TX delay chains */ + reg &= ~(SC_RXDC_MASK << SC_RXDC_SHIFT); + reg &= ~(SC_TXDC_MASK << SC_TXDC_SHIFT); + reg |= (priv->rx_delay & SC_RXDC_MASK) << SC_RXDC_SHIFT; + reg |= (priv->tx_delay & SC_TXDC_MASK) << SC_TXDC_SHIFT; + switch (priv->interface) { case PHY_INTERFACE_MODE_MII: /* default */ @@ -836,6 +848,19 @@ static int sun8i_emac_eth_ofdata_to_platdata(struct udevice *dev) } #endif
+ /* Get RX/TX delays for RGMII */ + priv->rx_delay = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(dev), + "allwinner,rx-delay-ps", 0); + if (priv->rx_delay % 100 || priv->rx_delay > 3100) + debug("%s: invalid rx delay value\n", __func__); + priv->rx_delay /= 100; + + priv->tx_delay = fdtdec_get_uint(gd->fdt_blob, dev_of_offset(dev), + "allwinner,tx-delay-ps", 0); + if (priv->tx_delay % 100 || priv->tx_delay > 800) + debug("%s: invalid tx delay value\n", __func__); + priv->tx_delay /= 100; + return 0; }