diff mbox series

[net-next,13/13] net: dsa: sja1105: add support for the SJA1110 SGMII/2500base-x PCS

Message ID 20210524232214.1378937-14-olteanv@gmail.com (mailing list archive)
State Superseded
Delegated to: Netdev Maintainers
Headers show
Series Add NXP SJA1110 support to the sja1105 DSA driver | expand

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Context Check Description
netdev/apply fail Patch does not apply to net-next
netdev/tree_selection success Clearly marked for net-next

Commit Message

Vladimir Oltean May 24, 2021, 11:22 p.m. UTC 
From: Vladimir Oltean <vladimir.oltean@nxp.com>

Configure the Synopsys PCS for 10/100/1000 SGMII in autoneg on/off
modes, or for fixed 2500base-x.

The portion of PCS configuration that forces the speed is common, but
the portion that initializes the PCS and enables/disables autoneg is
different, so a new .pcs_config() method was introduced in struct
sja1105_info to hide away the differences.

For the xMII Mode Parameters Table to be properly configured for SGMII
mode on SJA1110, we need to set the "special" bit, since SGMII is
officially bitwise coded as 0b0011 in SJA1105 (decimal 3, equal to
XMII_MODE_SGMII), and as 0b1011 in SJA1110 (decimal 11).

Cc: Russell King <linux@armlinux.org.uk>
Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com>
---
 drivers/net/dsa/sja1105/sja1105.h       |   9 +
 drivers/net/dsa/sja1105/sja1105_main.c  | 224 ++++++++++++++++++++++--
 drivers/net/dsa/sja1105/sja1105_mdio.c  |   3 +-
 drivers/net/dsa/sja1105/sja1105_sgmii.h |  61 +++++++
 drivers/net/dsa/sja1105/sja1105_spi.c   |   8 +
 5 files changed, 293 insertions(+), 12 deletions(-)

Comments

Florian Fainelli May 25, 2021, 2:39 a.m. UTC | #1 
On 5/24/2021 4:22 PM, Vladimir Oltean wrote:
> From: Vladimir Oltean <vladimir.oltean@nxp.com>
> 
> Configure the Synopsys PCS for 10/100/1000 SGMII in autoneg on/off
> modes, or for fixed 2500base-x.
> 
> The portion of PCS configuration that forces the speed is common, but
> the portion that initializes the PCS and enables/disables autoneg is
> different, so a new .pcs_config() method was introduced in struct
> sja1105_info to hide away the differences.
> 
> For the xMII Mode Parameters Table to be properly configured for SGMII
> mode on SJA1110, we need to set the "special" bit, since SGMII is
> officially bitwise coded as 0b0011 in SJA1105 (decimal 3, equal to
> XMII_MODE_SGMII), and as 0b1011 in SJA1110 (decimal 11).

That special bit appears to be write only in the patch you submitted, do
we need it?

How much of the programming you are doing is really specific to the
SJA1110 switch family and how much would be universally (or
configurable) applicable to a Synopsys PCS driver that would live
outside of this switch driver?
Vladimir Oltean May 25, 2021, 11:47 a.m. UTC | #2 
On Mon, May 24, 2021 at 07:39:42PM -0700, Florian Fainelli wrote:
> On 5/24/2021 4:22 PM, Vladimir Oltean wrote:
> > From: Vladimir Oltean <vladimir.oltean@nxp.com>
> > 
> > Configure the Synopsys PCS for 10/100/1000 SGMII in autoneg on/off
> > modes, or for fixed 2500base-x.
> > 
> > The portion of PCS configuration that forces the speed is common, but
> > the portion that initializes the PCS and enables/disables autoneg is
> > different, so a new .pcs_config() method was introduced in struct
> > sja1105_info to hide away the differences.
> > 
> > For the xMII Mode Parameters Table to be properly configured for SGMII
> > mode on SJA1110, we need to set the "special" bit, since SGMII is
> > officially bitwise coded as 0b0011 in SJA1105 (decimal 3, equal to
> > XMII_MODE_SGMII), and as 0b1011 in SJA1110 (decimal 11).
> 
> That special bit appears to be write only in the patch you submitted, do
> we need it?

Unfortunately yes.
What happens is this:

In SJA1105, the xMII Mode Parameters Table looks like this:

BIT(2): PHY_MAC: decides the role of the port (MAC or PHY) - relevant
for MII and RMII, irrelevant for RGMII. Defined in this driver as:

typedef enum {
	XMII_MAC = 0,
	XMII_PHY = 1,
} sja1105_mii_role_t;

BITS(1:0): XMII_MODE: defined in this driver as:

typedef enum {
	XMII_MODE_MII		= 0,
	XMII_MODE_RMII		= 1,
	XMII_MODE_RGMII		= 2,
	XMII_MODE_SGMII		= 3,
} sja1105_phy_interface_t;

Here's the interesting part:
In SJA1110, the xMII Mode Parameters Table contains a single XMII_MODE
field which is 4 bit wide. The documentation lists these possible values:

0: MII interface
4: revMII interface
1: RMII interface (RMII TX interface acts as transmit protocol as
   specified in RMII 1.2 spec)
11: SGMII interface
2: RGMII interface
7: INACTIVE (the port is cut off from the outside)
8: 100BASE-TX

If we dissect these values bitwise, we see that revMII in SJA1110 is
numerically equal to XMII_MODE_MII + XMII_PHY from SJA1105, so it makes
sense to keep interpreting the MII mode as 2 separate fields (MAC/PHY
role and MII mode).

Except the SGMII port is decimal 11, and it was decimal 3 in SJA1105.
Bitwise, 11 is 0b1011 and 3 is 0b0011. So while the low-order 3 bits did
not change, the 4th bit needs to be set in order to encode SGMII in
SJA1110.

Similarly, the internal ports connected to the 100base-T1 PHYs are just
XMII_MODE_MII + XMII_MAC (numerically this is equal to decimal 0). But
the internal port connected to the 100base-TX PHY wants to be programmed
to 8. Bitwise that is 0b1000. So the low order 3 bits still encode
XMII_MODE_MII + XMII_MAC.

So the "special" bit 4 is what allows me to keep the XMII_MODE_SGMII
definition at 3 (otherwise SJA1110 wants it to be 11, for a reason I
simply cannot comprehend), and to treat the ports with internal PHYs as
XMII_MODE_MII + XMII_MAC (even if one type of internal PHY wants the
XMII_MODE to be programmed as 0 and the other as 8).

I don't know, I know this is confusing, but I think having an extra
indirection (this is the value of SGMII for this switch) would be
confusing too.

> How much of the programming you are doing is really specific to the
> SJA1110 switch family and how much would be universally (or
> configurable) applicable to a Synopsys PCS driver that would live
> outside of this switch driver?

The pcs-xpcs.c from drivers/net/pcs already handles the same PCS
registers when operating in SGMII mode (their DW_VR_MII_DIG_CTRL1 is my
SJA1105_DC1, their DW_VR_MII_AN_CTRL is my SJA1105_AC, their
DW_VR_MII_AN_INTR_STS is my SJA1105_AIS etc) so there is some
similarity, but it is not as simple as that.

The Designware XPCS block is very customizable, and NXP integrates it
with a non-Designware PMA (this handles serialization and
deserialization of data) and PMD (this implements the CTLE, CDR, PLLs,
line driver, termination resistors). The PMA and PMD are configured
through some registers which are stuffed in the same MDIO PHY/MMD
address that is used to access the PCS. For example, the MDIO_VEND2 MMD
contains the following regions:
- 0000:000f: Designware PCS registers
- 0708:0710: Designware PCS registers
- 8000:8020: Designware PCS registers
- 8030:806e: PMA registers
- 80e1:80e2: Designware PCS registers

Having a non-Synopsys PMA even creates complications for programming the
common Designware PCS registers. For example, in the SJA1105 PMA, the
polarity for the differential TX lane is already inverted (i.e. PLUS is
MINUS and MINUS is PLUS), so in order to obtain the "no TX lane polarity
inversion" effect, one actually needs to enable TX lane polarity
inversion in the _PCS_:

	/* DIGITAL_CONTROL_2: No polarity inversion for TX and RX lanes */
	sja1105_sgmii_write(priv, SJA1105_DC2, SJA1105_DC2_TX_POL_INV_DISABLE);

With the PMA from the SJA1110, this is not necessary and the DIG_CTRL2
register needs to be programmed with 0 in order for both TX and RX lane
polarities to be normal.

So integrating sja1105 with xpcs might be possible, but not all
configuration will be possible to be done there. This is an exploratory
topic that I didn't want to tackle right now, although it is a good time
to discuss it.
diff mbox series

Patch

diff --git a/drivers/net/dsa/sja1105/sja1105.h b/drivers/net/dsa/sja1105/sja1105.h
index be788ddb7259..617d139a627f 100644
--- a/drivers/net/dsa/sja1105/sja1105.h
+++ b/drivers/net/dsa/sja1105/sja1105.h
@@ -132,6 +132,9 @@  struct sja1105_info {
 	int (*clocking_setup)(struct sja1105_private *priv);
 	int (*pcs_mdio_read)(struct mii_bus *bus, int phy, int reg);
 	int (*pcs_mdio_write)(struct mii_bus *bus, int phy, int reg, u16 val);
+	void (*pcs_config)(struct sja1105_private *priv, int port,
+			   bool an_enabled, bool an_master,
+			   phy_interface_t interface);
 	const char *name;
 	bool supports_mii[SJA1105_MAX_NUM_PORTS];
 	bool supports_rmii[SJA1105_MAX_NUM_PORTS];
@@ -304,6 +307,12 @@  int sja1110_pcs_mdio_write(struct mii_bus *bus, int phy, int reg, u16 val);
 int sja1105_pcs_read(struct sja1105_private *priv, int port, int mmd, int reg);
 int sja1105_pcs_write(struct sja1105_private *priv, int port, int mmd, int reg,
 		      u16 val);
+void sja1105_pcs_config(struct sja1105_private *priv, int port,
+			bool an_enabled, bool an_master,
+			phy_interface_t interface);
+void sja1110_pcs_config(struct sja1105_private *priv, int port,
+			bool an_enabled, bool an_master,
+			phy_interface_t interface);
 
 /* From sja1105_devlink.c */
 int sja1105_devlink_setup(struct dsa_switch *ds);
diff --git a/drivers/net/dsa/sja1105/sja1105_main.c b/drivers/net/dsa/sja1105/sja1105_main.c
index d0938daacbae..2ef23c8f725b 100644
--- a/drivers/net/dsa/sja1105/sja1105_main.c
+++ b/drivers/net/dsa/sja1105/sja1105_main.c
@@ -210,12 +210,14 @@  static int sja1105_init_mii_settings(struct sja1105_private *priv,
 				goto unsupported;
 
 			mii->xmii_mode[i] = XMII_MODE_SGMII;
+			mii->special[i] = true;
 			break;
 		case PHY_INTERFACE_MODE_2500BASEX:
 			if (!priv->info->supports_2500basex[i])
 				goto unsupported;
 
 			mii->xmii_mode[i] = XMII_MODE_SGMII;
+			mii->special[i] = true;
 			break;
 unsupported:
 		default:
@@ -234,6 +236,7 @@  static int sja1105_init_mii_settings(struct sja1105_private *priv,
 		 * but unconditionally put the port in the MAC role.
 		 */
 		if (ports[i].phy_mode == PHY_INTERFACE_MODE_SGMII ||
+		    ports[i].phy_mode == PHY_INTERFACE_MODE_2500BASEX ||
 		    phy_interface_mode_is_rgmii(ports[i].phy_mode))
 			mii->phy_mac[i] = XMII_MAC;
 		else
@@ -962,8 +965,9 @@  static int sja1105_parse_dt(struct sja1105_private *priv,
 	return rc;
 }
 
-static void sja1105_sgmii_pcs_config(struct sja1105_private *priv, int port,
-				     bool an_enabled, bool an_master)
+void sja1105_pcs_config(struct sja1105_private *priv, int port,
+			bool an_enabled, bool an_master,
+			phy_interface_t interface)
 {
 	u16 ac = SJA1105_AC_AUTONEG_MODE_SGMII;
 	int rc;
@@ -1012,6 +1016,188 @@  static void sja1105_sgmii_pcs_config(struct sja1105_private *priv, int port,
 		ERR_PTR(rc));
 }
 
+void sja1110_pcs_config(struct sja1105_private *priv, int port,
+			bool an_enabled, bool an_master,
+			phy_interface_t interface)
+{
+	const int timeout_us = 1000;
+	u16 val;
+	int rc;
+
+	/* Soft-reset the PCS */
+	rc = sja1105_pcs_write(priv, port, MDIO_MMD_VEND2, MDIO_CTRL1,
+			       MDIO_CTRL1_RESET);
+	if (rc < 0)
+		goto out_write_failed;
+
+	rc = read_poll_timeout(sja1105_pcs_read, val,
+			       !(val & MDIO_CTRL1_RESET),
+			       0, timeout_us, false,
+			       priv, port, MDIO_MMD_VEND2, MDIO_CTRL1);
+	if (rc || val < 0) {
+		dev_err(priv->ds->dev, "port %d PCS reset failed: %pe\n",
+			port, ERR_PTR(rc));
+		return;
+	}
+
+	val = SJA1105_DC1_EN_VSMMD1;
+	if (interface == PHY_INTERFACE_MODE_2500BASEX)
+		val |= SJA1105_DC1_ENA_2500_MODE;
+	if (an_master)
+		val |= SJA1105_DC1_MAC_AUTO_SW;
+
+	rc = sja1105_pcs_write(priv, port, MDIO_MMD_VEND2, SJA1105_DC1, val);
+	if (rc < 0)
+		goto out_write_failed;
+
+	/* Program TX PLL feedback divider and reference divider settings for
+	 * correct oscillation frequency.
+	 */
+	if (interface == PHY_INTERFACE_MODE_2500BASEX)
+		val = SJA1105_TXPLL_FBDIV(0x7d);
+	else
+		val = SJA1105_TXPLL_FBDIV(0x19);
+
+	rc = sja1105_pcs_write(priv, port, MDIO_MMD_VEND2, SJA1105_TXPLL_CTRL0,
+			       val);
+	if (rc < 0)
+		goto out_write_failed;
+
+	if (interface == PHY_INTERFACE_MODE_2500BASEX)
+		val = SJA1105_TXPLL_REFDIV(0x2);
+	else
+		val = SJA1105_TXPLL_REFDIV(0x1);
+
+	rc = sja1105_pcs_write(priv, port, MDIO_MMD_VEND2, SJA1105_TXPLL_CTRL1,
+			       val);
+	if (rc < 0)
+		goto out_write_failed;
+
+	/* Program transmitter amplitude and disable amplitude trimming */
+	rc = sja1105_pcs_write(priv, port, MDIO_MMD_VEND2,
+			       SJA1105_LANE_DRIVER1_0,
+			       SJA1105_TXDRV(0x5));
+	if (rc < 0)
+		goto out_write_failed;
+
+	val = SJA1105_TXDRVTRIM_LSB(0xffffffull);
+
+	rc = sja1105_pcs_write(priv, port, MDIO_MMD_VEND2,
+			       SJA1105_LANE_DRIVER2_0, val);
+	if (rc < 0)
+		goto out_write_failed;
+
+	val = SJA1105_TXDRVTRIM_MSB(0xffffffull) | SJA1105_LANE_DRIVER2_1_RSV;
+
+	rc = sja1105_pcs_write(priv, port, MDIO_MMD_VEND2,
+			       SJA1105_LANE_DRIVER2_1, val);
+	if (rc < 0)
+		goto out_write_failed;
+
+	/* Enable input and output resistor terminations for low BER. */
+	val = SJA1105_ACCOUPLE_RXVCM_EN | SJA1105_CDR_GAIN |
+	      SJA1105_RXRTRIM(4) | SJA1105_RXTEN | SJA1105_TXPLL_BWSEL |
+	      SJA1105_TXRTRIM(3) | SJA1105_TXTEN;
+
+	rc = sja1105_pcs_write(priv, port, MDIO_MMD_VEND2, SJA1105_LANE_TRIM,
+			       val);
+	if (rc < 0)
+		goto out_write_failed;
+
+	/* Select PCS as transmitter data source. */
+	rc = sja1105_pcs_write(priv, port, MDIO_MMD_VEND2,
+			       SJA1105_LANE_DATAPATH_1, 0);
+	if (rc < 0)
+		goto out_write_failed;
+
+	/* Program RX PLL feedback divider and reference divider for correct
+	 * oscillation frequency.
+	 */
+	if (interface == PHY_INTERFACE_MODE_2500BASEX)
+		val = SJA1105_RXPLL_FBDIV(0x7d);
+	else
+		val = SJA1105_RXPLL_FBDIV(0x19);
+
+	rc = sja1105_pcs_write(priv, port, MDIO_MMD_VEND2, SJA1105_RXPLL_CTRL0,
+			       val);
+	if (rc < 0)
+		goto out_write_failed;
+
+	if (interface == PHY_INTERFACE_MODE_2500BASEX)
+		val = SJA1105_RXPLL_REFDIV(0x2);
+	else
+		val = SJA1105_RXPLL_REFDIV(0x1);
+
+	rc = sja1105_pcs_write(priv, port, MDIO_MMD_VEND2, SJA1105_RXPLL_CTRL1,
+			       val);
+	if (rc < 0)
+		goto out_write_failed;
+
+	/* Program threshold for receiver signal detector.
+	 * Enable control of RXPLL by receiver signal detector to disable RXPLL
+	 * when an input signal is not present.
+	 */
+	rc = sja1105_pcs_write(priv, port, MDIO_MMD_VEND2,
+			       SJA1105_RX_DATA_DETECT, 0x0005);
+	if (rc < 0)
+		goto out_write_failed;
+
+	/* Enable TX and RX PLLs and circuits.
+	 * Release reset of PMA to enable data flow to/from PCS.
+	 */
+	val = sja1105_pcs_read(priv, port, MDIO_MMD_VEND2,
+			       SJA1105_POWERDOWN_ENABLE);
+	if (val < 0) {
+		dev_err(priv->ds->dev, "failed to read PCS: %pe\n",
+			ERR_PTR(val));
+		return;
+	}
+
+	val &= ~(SJA1105_TXPLL_PD | SJA1105_TXPD | SJA1105_RXCH_PD |
+		 SJA1105_RXBIAS_PD | SJA1105_RESET_SER_EN |
+		 SJA1105_RESET_SER | SJA1105_RESET_DES);
+	val |= SJA1105_RXPKDETEN | SJA1105_RCVEN;
+
+	rc = sja1105_pcs_write(priv, port, MDIO_MMD_VEND2,
+			       SJA1105_POWERDOWN_ENABLE, val);
+	if (rc < 0)
+		goto out_write_failed;
+
+	/* Program continuous-time linear equalizer (CTLE) settings. */
+	if (interface == PHY_INTERFACE_MODE_2500BASEX)
+		val = 0x732a;
+	else
+		val = 0x212a;
+
+	rc = sja1105_pcs_write(priv, port, MDIO_MMD_VEND2, SJA1105_RX_CDR_CTLE,
+			       val);
+	if (rc < 0)
+		goto out_write_failed;
+
+	/* AUTONEG_CONTROL: Use SGMII autoneg in MAC mode */
+	rc = sja1105_pcs_write(priv, port, MDIO_MMD_VEND2, SJA1105_AC,
+			       SJA1105_AC_AUTONEG_MODE_SGMII);
+	if (rc < 0)
+		goto out_write_failed;
+
+	/* BASIC_CONTROL: enable in-band AN now, if requested. Otherwise,
+	 * sja1105_sgmii_pcs_force_speed must be called later for the link
+	 * to become operational.
+	 */
+	if (an_enabled) {
+		rc = sja1105_pcs_write(priv, port, MDIO_MMD_VEND2, MDIO_CTRL1,
+				       BMCR_ANENABLE | BMCR_ANRESTART);
+		if (rc < 0)
+			goto out_write_failed;
+	}
+
+	return;
+
+out_write_failed:
+	dev_err(priv->ds->dev, "Failed to write to PCS: %pe\n",
+		ERR_PTR(rc));
+}
+
 static void sja1105_sgmii_pcs_force_speed(struct sja1105_private *priv,
 					  int port, int speed)
 {
@@ -1019,6 +1205,7 @@  static void sja1105_sgmii_pcs_force_speed(struct sja1105_private *priv,
 	int rc;
 
 	switch (speed) {
+	case SPEED_2500:
 	case SPEED_1000:
 		pcs_speed = BMCR_SPEED1000;
 		break;
@@ -1092,6 +1279,9 @@  static int sja1105_adjust_port_config(struct sja1105_private *priv, int port,
 	case SPEED_1000:
 		speed = priv->info->port_speed[SJA1105_SPEED_1000MBPS];
 		break;
+	case SPEED_2500:
+		speed = priv->info->port_speed[SJA1105_SPEED_2500MBPS];
+		break;
 	default:
 		dev_err(dev, "Invalid speed %iMbps\n", speed_mbps);
 		return -EINVAL;
@@ -1106,6 +1296,8 @@  static int sja1105_adjust_port_config(struct sja1105_private *priv, int port,
 	 */
 	if (priv->phy_mode[port] == PHY_INTERFACE_MODE_SGMII)
 		mac[port].speed = priv->info->port_speed[SJA1105_SPEED_1000MBPS];
+	else if (priv->phy_mode[port] == PHY_INTERFACE_MODE_2500BASEX)
+		mac[port].speed = priv->info->port_speed[SJA1105_SPEED_2500MBPS];
 	else
 		mac[port].speed = speed;
 
@@ -1162,10 +1354,10 @@  static void sja1105_mac_config(struct dsa_switch *ds, int port,
 		return;
 	}
 
-	if (is_sgmii)
-		sja1105_sgmii_pcs_config(priv, port,
-					 phylink_autoneg_inband(mode),
-					 false);
+	if (state->interface == PHY_INTERFACE_MODE_SGMII ||
+	    state->interface == PHY_INTERFACE_MODE_2500BASEX)
+		priv->info->pcs_config(priv, port, phylink_autoneg_inband(mode),
+				       false, state->interface);
 }
 
 static void sja1105_mac_link_down(struct dsa_switch *ds, int port,
@@ -1186,7 +1378,8 @@  static void sja1105_mac_link_up(struct dsa_switch *ds, int port,
 
 	sja1105_adjust_port_config(priv, port, speed);
 
-	if (priv->phy_mode[port] == PHY_INTERFACE_MODE_SGMII &&
+	if ((priv->phy_mode[port] == PHY_INTERFACE_MODE_SGMII ||
+	     priv->phy_mode[port] == PHY_INTERFACE_MODE_2500BASEX) &&
 	    !phylink_autoneg_inband(mode))
 		sja1105_sgmii_pcs_force_speed(priv, port, speed);
 
@@ -1228,6 +1421,10 @@  static void sja1105_phylink_validate(struct dsa_switch *ds, int port,
 	if (mii->xmii_mode[port] == XMII_MODE_RGMII ||
 	    mii->xmii_mode[port] == XMII_MODE_SGMII)
 		phylink_set(mask, 1000baseT_Full);
+	if (priv->info->supports_2500basex[port]) {
+		phylink_set(mask, 2500baseT_Full);
+		phylink_set(mask, 2500baseX_Full);
+	}
 
 	bitmap_and(supported, supported, mask, __ETHTOOL_LINK_MODE_MASK_NBITS);
 	bitmap_and(state->advertising, state->advertising, mask,
@@ -1945,7 +2142,8 @@  int sja1105_static_config_reload(struct sja1105_private *priv,
 							      mac[i].speed);
 		mac[i].speed = priv->info->port_speed[SJA1105_SPEED_AUTO];
 
-		if (priv->phy_mode[i] == PHY_INTERFACE_MODE_SGMII)
+		if (priv->phy_mode[i] == PHY_INTERFACE_MODE_SGMII ||
+		    priv->phy_mode[i] == PHY_INTERFACE_MODE_2500BASEX)
 			bmcr[i] = sja1105_pcs_read(priv, i,
 						   MDIO_MMD_VEND2,
 						   MDIO_CTRL1);
@@ -2002,17 +2200,21 @@  int sja1105_static_config_reload(struct sja1105_private *priv,
 		if (rc < 0)
 			goto out;
 
-		if (priv->phy_mode[i] != PHY_INTERFACE_MODE_SGMII)
+		if (priv->phy_mode[i] != PHY_INTERFACE_MODE_SGMII &&
+		    priv->phy_mode[i] != PHY_INTERFACE_MODE_2500BASEX)
 			continue;
 
 		an_enabled = !!(bmcr[i] & BMCR_ANENABLE);
 
-		sja1105_sgmii_pcs_config(priv, i, an_enabled, false);
+		priv->info->pcs_config(priv, i, an_enabled, false,
+				       priv->phy_mode[i]);
 
 		if (!an_enabled) {
 			int speed = SPEED_UNKNOWN;
 
-			if (bmcr[i] & BMCR_SPEED1000)
+			if (priv->phy_mode[i] == PHY_INTERFACE_MODE_2500BASEX)
+				speed = SPEED_2500;
+			else if (bmcr[i] & BMCR_SPEED1000)
 				speed = SPEED_1000;
 			else if (bmcr[i] & BMCR_SPEED100)
 				speed = SPEED_100;
diff --git a/drivers/net/dsa/sja1105/sja1105_mdio.c b/drivers/net/dsa/sja1105/sja1105_mdio.c
index 7e83dd0f4f16..722d50665fde 100644
--- a/drivers/net/dsa/sja1105/sja1105_mdio.c
+++ b/drivers/net/dsa/sja1105/sja1105_mdio.c
@@ -424,7 +424,8 @@  static int sja1105_mdiobus_pcs_register(struct sja1105_private *priv)
 		if (dsa_is_unused_port(ds, port))
 			continue;
 
-		if (!priv->info->supports_sgmii[port])
+		if (!priv->info->supports_sgmii[port] &&
+		    !priv->info->supports_2500basex[port])
 			continue;
 
 		mdiodev = mdio_device_create(bus, port);
diff --git a/drivers/net/dsa/sja1105/sja1105_sgmii.h b/drivers/net/dsa/sja1105/sja1105_sgmii.h
index dc067b876758..b2d117f68417 100644
--- a/drivers/net/dsa/sja1105/sja1105_sgmii.h
+++ b/drivers/net/dsa/sja1105/sja1105_sgmii.h
@@ -15,6 +15,7 @@ 
 #define SJA1105_DC1_INIT		BIT(8)
 #define SJA1105_DC1_TX_DISABLE		BIT(4)
 #define SJA1105_DC1_AUTONEG_TIMER_OVRR	BIT(3)
+#define SJA1105_DC1_ENA_2500_MODE	BIT(2)
 #define SJA1105_DC1_BYP_POWERUP		BIT(1)
 #define SJA1105_DC1_PHY_MODE_CONTROL	BIT(0)
 
@@ -48,4 +49,64 @@ 
 #define SJA1105_DC_SUPPRESS_LOS		BIT(4)
 #define SJA1105_DC_RESTART_SYNC		BIT(0)
 
+/* LANE_DRIVER1_0 register (address 0x1f8038) */
+#define SJA1105_LANE_DRIVER1_0		0x8038
+#define SJA1105_TXDRV(x)		(((x) << 12) & GENMASK(14, 12))
+
+/* LANE_DRIVER2_0 register (address 0x1f803a) */
+#define SJA1105_LANE_DRIVER2_0		0x803a
+#define SJA1105_TXDRVTRIM_LSB(x)	((x) & GENMASK_ULL(15, 0))
+
+/* LANE_DRIVER2_1 register (address 0x1f803b) */
+#define SJA1105_LANE_DRIVER2_1		0x803b
+#define SJA1105_LANE_DRIVER2_1_RSV	BIT(9)
+#define SJA1105_TXDRVTRIM_MSB(x)	(((x) & GENMASK_ULL(23, 16)) >> 16)
+
+/* LANE_TRIM register (address 0x1f8040) */
+#define SJA1105_LANE_TRIM		0x8040
+#define SJA1105_TXTEN			BIT(11)
+#define SJA1105_TXRTRIM(x)		(((x) << 8) & GENMASK(10, 8))
+#define SJA1105_TXPLL_BWSEL		BIT(7)
+#define SJA1105_RXTEN			BIT(6)
+#define SJA1105_RXRTRIM(x)		(((x) << 3) & GENMASK(5, 3))
+#define SJA1105_CDR_GAIN		BIT(2)
+#define SJA1105_ACCOUPLE_RXVCM_EN	BIT(0)
+
+/* LANE_DATAPATH_1 register (address 0x1f8037) */
+#define SJA1105_LANE_DATAPATH_1		0x8037
+
+/* POWERDOWN_ENABLE register (address 0x1f8041) */
+#define SJA1105_POWERDOWN_ENABLE	0x8041
+#define SJA1105_TXPLL_PD		BIT(12)
+#define SJA1105_TXPD			BIT(11)
+#define SJA1105_RXPKDETEN		BIT(10)
+#define SJA1105_RXCH_PD			BIT(9)
+#define SJA1105_RXBIAS_PD		BIT(8)
+#define SJA1105_RESET_SER_EN		BIT(7)
+#define SJA1105_RESET_SER		BIT(6)
+#define SJA1105_RESET_DES		BIT(5)
+#define SJA1105_RCVEN			BIT(4)
+
+/* RXPLL_CTRL0 register (address 0x1f8065) */
+#define SJA1105_RXPLL_CTRL0		0x8065
+#define SJA1105_RXPLL_FBDIV(x)		(((x) << 2) & GENMASK(9, 2))
+
+/* RXPLL_CTRL1 register (address 0x1f8066) */
+#define SJA1105_RXPLL_CTRL1		0x8066
+#define SJA1105_RXPLL_REFDIV(x)		((x) & GENMASK(4, 0))
+
+/* TXPLL_CTRL0 register (address 0x1f806d) */
+#define SJA1105_TXPLL_CTRL0		0x806d
+#define SJA1105_TXPLL_FBDIV(x)		((x) & GENMASK(11, 0))
+
+/* TXPLL_CTRL1 register (address 0x1f806e) */
+#define SJA1105_TXPLL_CTRL1		0x806e
+#define SJA1105_TXPLL_REFDIV(x)		((x) & GENMASK(5, 0))
+
+/* RX_DATA_DETECT register (address 0x1f8045) */
+#define SJA1105_RX_DATA_DETECT		0x8045
+
+/* RX_CDR_CTLE register (address 0x1f8042) */
+#define SJA1105_RX_CDR_CTLE		0x8042
+
 #endif
diff --git a/drivers/net/dsa/sja1105/sja1105_spi.c b/drivers/net/dsa/sja1105/sja1105_spi.c
index e6c2cb68fcc4..c776a08e5e77 100644
--- a/drivers/net/dsa/sja1105/sja1105_spi.c
+++ b/drivers/net/dsa/sja1105/sja1105_spi.c
@@ -712,6 +712,7 @@  const struct sja1105_info sja1105r_info = {
 	.clocking_setup		= sja1105_clocking_setup,
 	.pcs_mdio_read		= sja1105_pcs_mdio_read,
 	.pcs_mdio_write		= sja1105_pcs_mdio_write,
+	.pcs_config		= sja1105_pcs_config,
 	.regs			= &sja1105pqrs_regs,
 	.port_speed		= {
 		[SJA1105_SPEED_AUTO] = 0,
@@ -748,6 +749,7 @@  const struct sja1105_info sja1105s_info = {
 	.clocking_setup		= sja1105_clocking_setup,
 	.pcs_mdio_read		= sja1105_pcs_mdio_read,
 	.pcs_mdio_write		= sja1105_pcs_mdio_write,
+	.pcs_config		= sja1105_pcs_config,
 	.port_speed		= {
 		[SJA1105_SPEED_AUTO] = 0,
 		[SJA1105_SPEED_10MBPS] = 3,
@@ -783,6 +785,7 @@  const struct sja1105_info sja1110a_info = {
 	.clocking_setup		= sja1110_clocking_setup,
 	.pcs_mdio_read		= sja1110_pcs_mdio_read,
 	.pcs_mdio_write		= sja1110_pcs_mdio_write,
+	.pcs_config		= sja1110_pcs_config,
 	.port_speed		= {
 		[SJA1105_SPEED_AUTO] = 0,
 		[SJA1105_SPEED_10MBPS] = 4,
@@ -830,6 +833,7 @@  const struct sja1105_info sja1110b_info = {
 	.clocking_setup		= sja1110_clocking_setup,
 	.pcs_mdio_read		= sja1110_pcs_mdio_read,
 	.pcs_mdio_write		= sja1110_pcs_mdio_write,
+	.pcs_config		= sja1110_pcs_config,
 	.port_speed		= {
 		[SJA1105_SPEED_AUTO] = 0,
 		[SJA1105_SPEED_10MBPS] = 4,
@@ -877,6 +881,7 @@  const struct sja1105_info sja1110c_info = {
 	.clocking_setup		= sja1110_clocking_setup,
 	.pcs_mdio_read		= sja1110_pcs_mdio_read,
 	.pcs_mdio_write		= sja1110_pcs_mdio_write,
+	.pcs_config		= sja1110_pcs_config,
 	.port_speed		= {
 		[SJA1105_SPEED_AUTO] = 0,
 		[SJA1105_SPEED_10MBPS] = 4,
@@ -924,6 +929,7 @@  const struct sja1105_info sja1110d_info = {
 	.clocking_setup		= sja1110_clocking_setup,
 	.pcs_mdio_read		= sja1110_pcs_mdio_read,
 	.pcs_mdio_write		= sja1110_pcs_mdio_write,
+	.pcs_config		= sja1110_pcs_config,
 	.port_speed		= {
 		[SJA1105_SPEED_AUTO] = 0,
 		[SJA1105_SPEED_10MBPS] = 4,
@@ -939,6 +945,8 @@  const struct sja1105_info sja1110d_info = {
 				   false, false, false, false, false, false},
 	.supports_sgmii		= {false, true, true, true, true,
 				   false, false, false, false, false, false},
+	.supports_2500basex	= {false, false, false, true, true,
+				   false, false, false, false, false, false},
 	.internal_phy		= {SJA1105_NO_PHY, SJA1105_NO_PHY,
 				   SJA1105_NO_PHY, SJA1105_NO_PHY,
 				   SJA1105_NO_PHY, SJA1105_PHY_BASE_T1,