Commit 909bea73 authored by Tobias Waldekranz's avatar Tobias Waldekranz Committed by David S. Miller
Browse files

net/fsl: xgmac_mdio: Support preamble suppression 



Support the standard "suppress-preamble" attribute to disable preamble
generation.

Signed-off-by: default avatarTobias Waldekranz <tobias@waldekranz.com>
Reviewed-by: default avatarAndrew Lunn <andrew@lunn.ch>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 1d14eb15

drivers/net/ethernet/freescale/xgmac_mdio.c

+18 −0
Original line number Diff line number Diff line
@@ -39,6 +39,7 @@ struct tgec_mdio_controller { 
#define MDIO_STAT_CLKDIV(x)	(((x>>1) & 0xff) << 8)

#define MDIO_STAT_BSY		BIT(0)

#define MDIO_STAT_RD_ER		BIT(1)

#define MDIO_STAT_PRE_DIS	BIT(5)

#define MDIO_CTL_DEV_ADDR(x) 	(x & 0x1f)

#define MDIO_CTL_PORT_ADDR(x)	((x & 0x1f) << 5)

#define MDIO_CTL_PRE_DIS	BIT(10)
@@ -254,6 +255,21 @@ static int xgmac_mdio_read(struct mii_bus *bus, int phy_id, int regnum) 
	return ret;

}



static void xgmac_mdio_set_suppress_preamble(struct mii_bus *bus)

{

	struct mdio_fsl_priv *priv = (struct mdio_fsl_priv *)bus->priv;

	struct tgec_mdio_controller __iomem *regs = priv->mdio_base;

	struct device *dev = bus->parent;

	u32 mdio_stat;



	if (!device_property_read_bool(dev, "suppress-preamble"))

		return;



	mdio_stat = xgmac_read32(&regs->mdio_stat, priv->is_little_endian);

	mdio_stat |= MDIO_STAT_PRE_DIS;

	xgmac_write32(mdio_stat, &regs->mdio_stat, priv->is_little_endian);

}



static int xgmac_mdio_probe(struct platform_device *pdev)

{

	struct fwnode_handle *fwnode;
@@ -301,6 +317,8 @@ static int xgmac_mdio_probe(struct platform_device *pdev) 
	priv->has_a011043 = device_property_read_bool(&pdev->dev,

						      "fsl,erratum-a011043");



	xgmac_mdio_set_suppress_preamble(bus);



	fwnode = pdev->dev.fwnode;

	if (is_of_node(fwnode))

		ret = of_mdiobus_register(bus, to_of_node(fwnode));