Merge branch 'net-pcs-xpcs-yet-more-cleanups'

Russell King says:

====================
net: pcs: xpcs: yet more cleanups

I've found yet more potential for cleanups in the XPCS driver.

The first patch switches to using generic register definitions.

Next, there's an overly complex bit of code in xpcs_link_up_1000basex()
which can be simplified down to a simple if() statement.

Then, rearrange xpcs_link_up_1000basex() to separate out the warnings
from the functional bit.

Next, realising that the functional bit is just the helper function we
already have and are using in the SGMII version of this function,
switch over to that.

We can now see that xpcs_link_up_1000basex() and xpcs_link_up_sgmii()
are basically functionally identical except for the warnings, so merge
the two functions.

Next, xpcs_config_usxgmii() seems misnamed, so rename it to follow the
established pattern.

Lastly, "return foo();" where foo is a void function and the function
being returned from is also void is a weird programming pattern.
Replace this with something more conventional.

With these changes, we see yet another reduction in the amount of
code in this driver.

Tested-by: Serge Semin <fancer.lancer@gmail.com>
====================

Link: https://patch.msgid.link/ZxD6cVFajwBlC9eN@shell.armlinux.org.uk
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

2 files changed, 65 insertions, 81 deletions

diff --git a/drivers/net/pcs/pcs-xpcs.c b/drivers/net/pcs/pcs-xpcs.c
index c69421e80d19..7246a910728d 100644
--- a/drivers/net/pcs/pcs-xpcs.c
+++ b/drivers/net/pcs/pcs-xpcs.c
@@ -223,8 +223,8 @@ static int xpcs_poll_reset(struct dw_xpcs *xpcs, int dev)
 	int ret, val;
 
 	ret = read_poll_timeout(xpcs_read, val,
-				val < 0 || !(val & MDIO_CTRL1_RESET),
-				50000, 600000, true, xpcs, dev, MDIO_CTRL1);
+				val < 0 || !(val & BMCR_RESET),
+				50000, 600000, true, xpcs, dev, MII_BMCR);
 	if (val < 0)
 		ret = val;
 
@@ -250,7 +250,7 @@ static int xpcs_soft_reset(struct dw_xpcs *xpcs,
 		return -EINVAL;
 	}
 
-	ret = xpcs_write(xpcs, dev, MDIO_CTRL1, MDIO_CTRL1_RESET);
+	ret = xpcs_write(xpcs, dev, MII_BMCR, BMCR_RESET);
 	if (ret < 0)
 		return ret;
 
@@ -311,7 +311,7 @@ static int xpcs_read_fault_c73(struct dw_xpcs *xpcs,
 	return 0;
 }
 
-static void xpcs_config_usxgmii(struct dw_xpcs *xpcs, int speed)
+static void xpcs_link_up_usxgmii(struct dw_xpcs *xpcs, int speed)
 {
 	int ret, speed_sel;
 
@@ -343,7 +343,7 @@ static void xpcs_config_usxgmii(struct dw_xpcs *xpcs, int speed)
 	if (ret < 0)
 		goto out;
 
-	ret = xpcs_modify(xpcs, MDIO_MMD_VEND2, MDIO_CTRL1, DW_USXGMII_SS_MASK,
+	ret = xpcs_modify(xpcs, MDIO_MMD_VEND2, MII_BMCR, DW_USXGMII_SS_MASK,
 			  speed_sel | DW_USXGMII_FULL);
 	if (ret < 0)
 		goto out;
@@ -646,19 +646,21 @@ static int xpcs_config_aneg_c37_sgmii(struct dw_xpcs *xpcs,
 	 *    speed/duplex mode change by HW after SGMII AN complete)
 	 * 5) VR_MII_MMD_CTRL Bit(12) [AN_ENABLE] = 1b (Enable SGMII AN)
 	 *
+	 * Note that VR_MII_MMD_CTRL is MII_BMCR.
+	 *
 	 * Note: Since it is MAC side SGMII, there is no need to set
 	 *	 SR_MII_AN_ADV. MAC side SGMII receives AN Tx Config from
 	 *	 PHY about the link state change after C28 AN is completed
 	 *	 between PHY and Link Partner. There is also no need to
 	 *	 trigger AN restart for MAC-side SGMII.
 	 */
-	mdio_ctrl = xpcs_read(xpcs, MDIO_MMD_VEND2, DW_VR_MII_MMD_CTRL);
+	mdio_ctrl = xpcs_read(xpcs, MDIO_MMD_VEND2, MII_BMCR);
 	if (mdio_ctrl < 0)
 		return mdio_ctrl;
 
-	if (mdio_ctrl & AN_CL37_EN) {
-		ret = xpcs_write(xpcs, MDIO_MMD_VEND2, DW_VR_MII_MMD_CTRL,
-				 mdio_ctrl & ~AN_CL37_EN);
+	if (mdio_ctrl & BMCR_ANENABLE) {
+		ret = xpcs_write(xpcs, MDIO_MMD_VEND2, MII_BMCR,
+				 mdio_ctrl & ~BMCR_ANENABLE);
 		if (ret < 0)
 			return ret;
 	}
@@ -696,8 +698,8 @@ static int xpcs_config_aneg_c37_sgmii(struct dw_xpcs *xpcs,
 		return ret;
 
 	if (neg_mode == PHYLINK_PCS_NEG_INBAND_ENABLED)
-		ret = xpcs_write(xpcs, MDIO_MMD_VEND2, DW_VR_MII_MMD_CTRL,
-				 mdio_ctrl | AN_CL37_EN);
+		ret = xpcs_write(xpcs, MDIO_MMD_VEND2, MII_BMCR,
+				 mdio_ctrl | BMCR_ANENABLE);
 
 	return ret;
 }
@@ -715,14 +717,16 @@ static int xpcs_config_aneg_c37_1000basex(struct dw_xpcs *xpcs,
 	 * be disabled first:-
 	 * 1) VR_MII_MMD_CTRL Bit(12)[AN_ENABLE] = 0b
 	 * 2) VR_MII_AN_CTRL Bit(2:1)[PCS_MODE] = 00b (1000BASE-X C37)
+	 *
+	 * Note that VR_MII_MMD_CTRL is MII_BMCR.
 	 */
-	mdio_ctrl = xpcs_read(xpcs, MDIO_MMD_VEND2, DW_VR_MII_MMD_CTRL);
+	mdio_ctrl = xpcs_read(xpcs, MDIO_MMD_VEND2, MII_BMCR);
 	if (mdio_ctrl < 0)
 		return mdio_ctrl;
 
-	if (mdio_ctrl & AN_CL37_EN) {
-		ret = xpcs_write(xpcs, MDIO_MMD_VEND2, DW_VR_MII_MMD_CTRL,
-				 mdio_ctrl & ~AN_CL37_EN);
+	if (mdio_ctrl & BMCR_ANENABLE) {
+		ret = xpcs_write(xpcs, MDIO_MMD_VEND2, MII_BMCR,
+				 mdio_ctrl & ~BMCR_ANENABLE);
 		if (ret < 0)
 			return ret;
 	}
@@ -760,8 +764,8 @@ static int xpcs_config_aneg_c37_1000basex(struct dw_xpcs *xpcs,
 		return ret;
 
 	if (neg_mode == PHYLINK_PCS_NEG_INBAND_ENABLED) {
-		ret = xpcs_write(xpcs, MDIO_MMD_VEND2, DW_VR_MII_MMD_CTRL,
-				 mdio_ctrl | AN_CL37_EN);
+		ret = xpcs_write(xpcs, MDIO_MMD_VEND2, MII_BMCR,
+				 mdio_ctrl | BMCR_ANENABLE);
 		if (ret < 0)
 			return ret;
 	}
@@ -780,9 +784,9 @@ static int xpcs_config_2500basex(struct dw_xpcs *xpcs)
 	if (ret < 0)
 		return ret;
 
-	return xpcs_modify(xpcs, MDIO_MMD_VEND2, DW_VR_MII_MMD_CTRL,
-			   AN_CL37_EN | SGMII_SPEED_SS6 | SGMII_SPEED_SS13,
-			   SGMII_SPEED_SS6);
+	return xpcs_modify(xpcs, MDIO_MMD_VEND2, MII_BMCR,
+			   BMCR_ANENABLE | BMCR_SPEED1000 | BMCR_SPEED100,
+			   BMCR_SPEED1000);
 }
 
 static int xpcs_do_config(struct dw_xpcs *xpcs, phy_interface_t interface,
@@ -972,14 +976,14 @@ static int xpcs_get_state_c37_sgmii(struct dw_xpcs *xpcs,
 
 		state->link = true;
 
-		speed = xpcs_read(xpcs, MDIO_MMD_VEND2, MDIO_CTRL1);
+		speed = xpcs_read(xpcs, MDIO_MMD_VEND2, MII_BMCR);
 		if (speed < 0)
 			return speed;
 
-		speed &= SGMII_SPEED_SS13 | SGMII_SPEED_SS6;
-		if (speed == SGMII_SPEED_SS6)
+		speed &= BMCR_SPEED100 | BMCR_SPEED1000;
+		if (speed == BMCR_SPEED1000)
 			state->speed = SPEED_1000;
-		else if (speed == SGMII_SPEED_SS13)
+		else if (speed == BMCR_SPEED100)
 			state->speed = SPEED_100;
 		else if (speed == 0)
 			state->speed = SPEED_10;
@@ -988,9 +992,9 @@ static int xpcs_get_state_c37_sgmii(struct dw_xpcs *xpcs,
 		if (duplex < 0)
 			return duplex;
 
-		if (duplex & DW_FULL_DUPLEX)
+		if (duplex & ADVERTISE_1000XFULL)
 			state->duplex = DUPLEX_FULL;
-		else if (duplex & DW_HALF_DUPLEX)
+		else if (duplex & ADVERTISE_1000XHALF)
 			state->duplex = DUPLEX_HALF;
 
 		xpcs_write(xpcs, MDIO_MMD_VEND2, DW_VR_MII_AN_INTR_STS, 0);
@@ -1039,13 +1043,13 @@ static int xpcs_get_state_2500basex(struct dw_xpcs *xpcs,
 {
 	int ret;
 
-	ret = xpcs_read(xpcs, MDIO_MMD_VEND2, DW_VR_MII_MMD_STS);
+	ret = xpcs_read(xpcs, MDIO_MMD_VEND2, MII_BMSR);
 	if (ret < 0) {
 		state->link = 0;
 		return ret;
 	}
 
-	state->link = !!(ret & DW_VR_MII_MMD_STS_LINK_STS);
+	state->link = !!(ret & BMSR_LSTATUS);
 	if (!state->link)
 		return 0;
 
@@ -1100,48 +1104,32 @@ static void xpcs_get_state(struct phylink_pcs *pcs,
 	}
 }
 
-static void xpcs_link_up_sgmii(struct dw_xpcs *xpcs, unsigned int neg_mode,
-			       int speed, int duplex)
+static void xpcs_link_up_sgmii_1000basex(struct dw_xpcs *xpcs,
+					 unsigned int neg_mode,
+					 phy_interface_t interface,
+					 int speed, int duplex)
 {
-	int val, ret;
+	int ret;
 
 	if (neg_mode == PHYLINK_PCS_NEG_INBAND_ENABLED)
 		return;
 
-	val = mii_bmcr_encode_fixed(speed, duplex);
-	ret = xpcs_write(xpcs, MDIO_MMD_VEND2, MDIO_CTRL1, val);
-	if (ret)
-		dev_err(&xpcs->mdiodev->dev, "%s: xpcs_write returned %pe\n",
-			__func__, ERR_PTR(ret));
-}
-
-static void xpcs_link_up_1000basex(struct dw_xpcs *xpcs, unsigned int neg_mode,
-				   int speed, int duplex)
-{
-	int val, ret;
-
-	if (neg_mode == PHYLINK_PCS_NEG_INBAND_ENABLED)
-		return;
+	if (interface == PHY_INTERFACE_MODE_1000BASEX) {
+		if (speed != SPEED_1000) {
+			dev_err(&xpcs->mdiodev->dev,
+				"%s: speed %dMbps not supported\n",
+				__func__, speed);
+			return;
+		}
 
-	switch (speed) {
-	case SPEED_1000:
-		val = BMCR_SPEED1000;
-		break;
-	case SPEED_100:
-	case SPEED_10:
-	default:
-		dev_err(&xpcs->mdiodev->dev, "%s: speed = %d\n",
-			__func__, speed);
-		return;
+		if (duplex != DUPLEX_FULL)
+			dev_err(&xpcs->mdiodev->dev,
+				"%s: half duplex not supported\n",
+				__func__);
 	}
 
-	if (duplex == DUPLEX_FULL)
-		val |= BMCR_FULLDPLX;
-	else
-		dev_err(&xpcs->mdiodev->dev, "%s: half duplex not supported\n",
-			__func__);
-
-	ret = xpcs_write(xpcs, MDIO_MMD_VEND2, MDIO_CTRL1, val);
+	ret = xpcs_write(xpcs, MDIO_MMD_VEND2, MII_BMCR,
+			 mii_bmcr_encode_fixed(speed, duplex));
 	if (ret)
 		dev_err(&xpcs->mdiodev->dev, "%s: xpcs_write returned %pe\n",
 			__func__, ERR_PTR(ret));
@@ -1152,19 +1140,27 @@ static void xpcs_link_up(struct phylink_pcs *pcs, unsigned int neg_mode,
 {
 	struct dw_xpcs *xpcs = phylink_pcs_to_xpcs(pcs);
 
-	if (interface == PHY_INTERFACE_MODE_USXGMII)
-		return xpcs_config_usxgmii(xpcs, speed);
-	if (interface == PHY_INTERFACE_MODE_SGMII)
-		return xpcs_link_up_sgmii(xpcs, neg_mode, speed, duplex);
-	if (interface == PHY_INTERFACE_MODE_1000BASEX)
-		return xpcs_link_up_1000basex(xpcs, neg_mode, speed, duplex);
+	switch (interface) {
+	case PHY_INTERFACE_MODE_USXGMII:
+		xpcs_link_up_usxgmii(xpcs, speed);
+		break;
+
+	case PHY_INTERFACE_MODE_SGMII:
+	case PHY_INTERFACE_MODE_1000BASEX:
+		xpcs_link_up_sgmii_1000basex(xpcs, neg_mode, interface, speed,
+					     duplex);
+		break;
+
+	default:
+		break;
+	}
 }
 
 static void xpcs_an_restart(struct phylink_pcs *pcs)
 {
 	struct dw_xpcs *xpcs = phylink_pcs_to_xpcs(pcs);
 
-	xpcs_modify(xpcs, MDIO_MMD_VEND2, MDIO_CTRL1, BMCR_ANRESTART,
+	xpcs_modify(xpcs, MDIO_MMD_VEND2, MII_BMCR, BMCR_ANRESTART,
 		    BMCR_ANRESTART);
 }
 
diff --git a/drivers/net/pcs/pcs-xpcs.h b/drivers/net/pcs/pcs-xpcs.h
index 9a22eed4404d..adc5a0b3c883 100644
--- a/drivers/net/pcs/pcs-xpcs.h
+++ b/drivers/net/pcs/pcs-xpcs.h
@@ -54,9 +54,6 @@
 
 /* Clause 37 Defines */
 /* VR MII MMD registers offsets */
-#define DW_VR_MII_MMD_CTRL		0x0000
-#define DW_VR_MII_MMD_STS		0x0001
-#define DW_VR_MII_MMD_STS_LINK_STS	BIT(2)
 #define DW_VR_MII_DIG_CTRL1		0x8000
 #define DW_VR_MII_AN_CTRL		0x8001
 #define DW_VR_MII_AN_INTR_STS		0x8002
@@ -93,15 +90,6 @@
 #define DW_VR_MII_C37_ANSGM_SP_1000		0x2
 #define DW_VR_MII_C37_ANSGM_SP_LNKSTS		BIT(4)
 
-/* SR MII MMD Control defines */
-#define AN_CL37_EN			BIT(12)	/* Enable Clause 37 auto-nego */
-#define SGMII_SPEED_SS13		BIT(13)	/* SGMII speed along with SS6 */
-#define SGMII_SPEED_SS6			BIT(6)	/* SGMII speed along with SS13 */
-
-/* SR MII MMD AN Advertisement defines */
-#define DW_HALF_DUPLEX			BIT(6)
-#define DW_FULL_DUPLEX			BIT(5)
-
 /* VR MII EEE Control 0 defines */
 #define DW_VR_MII_EEE_LTX_EN			BIT(0)  /* LPI Tx Enable */
 #define DW_VR_MII_EEE_LRX_EN			BIT(1)  /* LPI Rx Enable */