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net/fsl: xgmac_mdio: Support preamble suppression

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

Signed-off-by: Tobias Waldekranz <tobias@waldekranz.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tobias Waldekranz 2022-01-26 17:05:41 +01:00 committed by David S. Miller
parent 1d14eb15dc
commit 909bea7348
1 changed files with 18 additions and 0 deletions
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18
drivers/net/ethernet/freescale/xgmac_mdio.c
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@ -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 @@ irq_restore:
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));