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 | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+)
diff --git a/drivers/net/sun8i_emac.c b/drivers/net/sun8i_emac.c index 3ccc6b0bb612..ea26450d34bc 100644 --- a/drivers/net/sun8i_emac.c +++ b/drivers/net/sun8i_emac.c @@ -14,6 +14,7 @@ #include <asm/io.h> #include <asm/arch/clock.h> #include <asm/arch/gpio.h> +#include <bitfield.h> #include <common.h> #include <dm.h> #include <fdt_support.h> @@ -56,6 +57,8 @@ #define H3_EPHY_SELECT BIT(15) /* 1: internal PHY, 0: external PHY */
#define SC_RMII_EN BIT(13) +#define SC_TXDC_MASK GENMASK(12, 10) +#define SC_RXDC_MASK GENMASK(9, 5) #define SC_EPIT BIT(2) /* 1: RGMII, 0: MII */ #define SC_ETCS_MASK GENMASK(1, 0) #define SC_ETCS_EXT_GMII 0x1 @@ -125,6 +128,8 @@ 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 +295,10 @@ 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 = bitfield_replace_by_mask(reg, SC_RXDC_MASK, priv->rx_delay); + reg = bitfield_replace_by_mask(reg, SC_TXDC_MASK, priv->tx_delay); + switch (priv->interface) { case PHY_INTERFACE_MODE_MII: /* default */ @@ -839,6 +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; }