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From:   Oleksij Rempel <o.rempel@pengutronix.de>
To:     "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>, Andrew Lunn <andrew@lunn.ch>,
        Heiner Kallweit <hkallweit1@gmail.com>,
        Russell King <linux@armlinux.org.uk>
Cc:     Oleksij Rempel <o.rempel@pengutronix.de>, kernel@pengutronix.de,
        linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org,
        netdev@vger.kernel.org
Subject: [PATCH net-next v2 4/8] net: usb: asix: ax88772: add phylib support
Date:   Mon,  7 Jun 2021 10:27:23 +0200
Message-Id: <20210607082727.26045-5-o.rempel@pengutronix.de>
In-Reply-To: <20210607082727.26045-1-o.rempel@pengutronix.de>
References: <20210607082727.26045-1-o.rempel@pengutronix.de>
MIME-Version: 1.0
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To be able to use ax88772 with external PHYs and use advantage of
existing PHY drivers, we need to port at least ax88772 part of asix
driver to the phylib framework.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
 drivers/net/usb/asix.h         |   9 +++
 drivers/net/usb/asix_common.c  |  37 ++++++++++
 drivers/net/usb/asix_devices.c | 120 +++++++++++++++++++++------------
 drivers/net/usb/ax88172a.c     |  14 ----
 4 files changed, 122 insertions(+), 58 deletions(-)

diff --git a/drivers/net/usb/asix.h b/drivers/net/usb/asix.h
index edb94efd265e..2122d302e643 100644
--- a/drivers/net/usb/asix.h
+++ b/drivers/net/usb/asix.h
@@ -25,6 +25,7 @@
 #include <linux/usb/usbnet.h>
 #include <linux/slab.h>
 #include <linux/if_vlan.h>
+#include <linux/phy.h>
 
 #define DRIVER_VERSION "22-Dec-2011"
 #define DRIVER_NAME "asix"
@@ -178,6 +179,10 @@ struct asix_common_private {
 	u16 presvd_phy_advertise;
 	u16 presvd_phy_bmcr;
 	struct asix_rx_fixup_info rx_fixup_info;
+	struct mii_bus *mdio;
+	struct phy_device *phydev;
+	u16 phy_addr;
+	char phy_name[20];
 };
 
 extern const struct driver_info ax88172a_info;
@@ -214,6 +219,7 @@ int asix_write_rx_ctl(struct usbnet *dev, u16 mode, int in_pm);
 
 u16 asix_read_medium_status(struct usbnet *dev, int in_pm);
 int asix_write_medium_mode(struct usbnet *dev, u16 mode, int in_pm);
+void asix_adjust_link(struct net_device *netdev);
 
 int asix_write_gpio(struct usbnet *dev, u16 value, int sleep, int in_pm);
 
@@ -222,6 +228,9 @@ void asix_set_multicast(struct net_device *net);
 int asix_mdio_read(struct net_device *netdev, int phy_id, int loc);
 void asix_mdio_write(struct net_device *netdev, int phy_id, int loc, int val);
 
+int asix_mdio_bus_read(struct mii_bus *bus, int phy_id, int regnum);
+int asix_mdio_bus_write(struct mii_bus *bus, int phy_id, int regnum, u16 val);
+
 int asix_mdio_read_nopm(struct net_device *netdev, int phy_id, int loc);
 void asix_mdio_write_nopm(struct net_device *netdev, int phy_id, int loc,
 			  int val);
diff --git a/drivers/net/usb/asix_common.c b/drivers/net/usb/asix_common.c
index e1109f1a8dd5..085bc8281082 100644
--- a/drivers/net/usb/asix_common.c
+++ b/drivers/net/usb/asix_common.c
@@ -384,6 +384,27 @@ int asix_write_medium_mode(struct usbnet *dev, u16 mode, int in_pm)
 	return ret;
 }
 
+/* set MAC link settings according to information from phylib */
+void asix_adjust_link(struct net_device *netdev)
+{
+	struct phy_device *phydev = netdev->phydev;
+	struct usbnet *dev = netdev_priv(netdev);
+	u16 mode = 0;
+
+	if (phydev->link) {
+		mode = AX88772_MEDIUM_DEFAULT;
+
+		if (phydev->duplex == DUPLEX_HALF)
+			mode &= ~AX_MEDIUM_FD;
+
+		if (phydev->speed != SPEED_100)
+			mode &= ~AX_MEDIUM_PS;
+	}
+
+	asix_write_medium_mode(dev, mode, 0);
+	phy_print_status(phydev);
+}
+
 int asix_write_gpio(struct usbnet *dev, u16 value, int sleep, int in_pm)
 {
 	int ret;
@@ -506,6 +527,22 @@ void asix_mdio_write(struct net_device *netdev, int phy_id, int loc, int val)
 	mutex_unlock(&dev->phy_mutex);
 }
 
+/* MDIO read and write wrappers for phylib */
+int asix_mdio_bus_read(struct mii_bus *bus, int phy_id, int regnum)
+{
+	struct usbnet *priv = bus->priv;
+
+	return asix_mdio_read(priv->net, phy_id, regnum);
+}
+
+int asix_mdio_bus_write(struct mii_bus *bus, int phy_id, int regnum, u16 val)
+{
+	struct usbnet *priv = bus->priv;
+
+	asix_mdio_write(priv->net, phy_id, regnum, val);
+	return 0;
+}
+
 int asix_mdio_read_nopm(struct net_device *netdev, int phy_id, int loc)
 {
 	struct usbnet *dev = netdev_priv(netdev);
diff --git a/drivers/net/usb/asix_devices.c b/drivers/net/usb/asix_devices.c
index 00b6ac0570eb..e4cd85e38edd 100644
--- a/drivers/net/usb/asix_devices.c
+++ b/drivers/net/usb/asix_devices.c
@@ -285,7 +285,7 @@ static int ax88172_bind(struct usbnet *dev, struct usb_interface *intf)
 
 static const struct ethtool_ops ax88772_ethtool_ops = {
 	.get_drvinfo		= asix_get_drvinfo,
-	.get_link		= asix_get_link,
+	.get_link		= usbnet_get_link,
 	.get_msglevel		= usbnet_get_msglevel,
 	.set_msglevel		= usbnet_set_msglevel,
 	.get_wol		= asix_get_wol,
@@ -293,37 +293,15 @@ static const struct ethtool_ops ax88772_ethtool_ops = {
 	.get_eeprom_len		= asix_get_eeprom_len,
 	.get_eeprom		= asix_get_eeprom,
 	.set_eeprom		= asix_set_eeprom,
-	.nway_reset		= usbnet_nway_reset,
-	.get_link_ksettings	= usbnet_get_link_ksettings_mii,
-	.set_link_ksettings	= usbnet_set_link_ksettings_mii,
+	.nway_reset		= phy_ethtool_nway_reset,
+	.get_link_ksettings	= phy_ethtool_get_link_ksettings,
+	.set_link_ksettings	= phy_ethtool_set_link_ksettings,
 };
 
-static int ax88772_link_reset(struct usbnet *dev)
-{
-	u16 mode;
-	struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET };
-
-	mii_check_media(&dev->mii, 1, 1);
-	mii_ethtool_gset(&dev->mii, &ecmd);
-	mode = AX88772_MEDIUM_DEFAULT;
-
-	if (ethtool_cmd_speed(&ecmd) != SPEED_100)
-		mode &= ~AX_MEDIUM_PS;
-
-	if (ecmd.duplex != DUPLEX_FULL)
-		mode &= ~AX_MEDIUM_FD;
-
-	netdev_dbg(dev->net, "ax88772_link_reset() speed: %u duplex: %d setting mode to 0x%04x\n",
-		   ethtool_cmd_speed(&ecmd), ecmd.duplex, mode);
-
-	asix_write_medium_mode(dev, mode, 0);
-
-	return 0;
-}
-
 static int ax88772_reset(struct usbnet *dev)
 {
 	struct asix_data *data = (struct asix_data *)&dev->data;
+	struct asix_common_private *priv = dev->driver_priv;
 	int ret;
 
 	/* Rewrite MAC address */
@@ -342,6 +320,8 @@ static int ax88772_reset(struct usbnet *dev)
 	if (ret < 0)
 		goto out;
 
+	phy_start(priv->phydev);
+
 	return 0;
 
 out:
@@ -586,7 +566,7 @@ static const struct net_device_ops ax88772_netdev_ops = {
 	.ndo_get_stats64	= dev_get_tstats64,
 	.ndo_set_mac_address 	= asix_set_mac_address,
 	.ndo_validate_addr	= eth_validate_addr,
-	.ndo_do_ioctl		= asix_ioctl,
+	.ndo_do_ioctl		= phy_do_ioctl_running,
 	.ndo_set_rx_mode        = asix_set_multicast,
 };
 
@@ -677,12 +657,57 @@ static int asix_resume(struct usb_interface *intf)
 	return usbnet_resume(intf);
 }
 
+static int ax88772_init_mdio(struct usbnet *dev)
+{
+	struct asix_common_private *priv = dev->driver_priv;
+
+	priv->mdio = devm_mdiobus_alloc(&dev->udev->dev);
+	if (!priv->mdio)
+		return -ENOMEM;
+
+	priv->mdio->priv = dev;
+	priv->mdio->read = &asix_mdio_bus_read;
+	priv->mdio->write = &asix_mdio_bus_write;
+	priv->mdio->name = "Asix MDIO Bus";
+	/* mii bus name is usb-<usb bus number>-<usb device number> */
+	snprintf(priv->mdio->id, MII_BUS_ID_SIZE, "usb-%03d:%03d",
+		 dev->udev->bus->busnum, dev->udev->devnum);
+
+	return devm_mdiobus_register(&dev->udev->dev, priv->mdio);
+}
+
+static int ax88772_init_phy(struct usbnet *dev)
+{
+	struct asix_common_private *priv = dev->driver_priv;
+	int ret;
+
+	priv->phy_addr = asix_read_phy_addr(dev, true);
+	if (priv->phy_addr < 0)
+		return priv->phy_addr;
+
+	snprintf(priv->phy_name, sizeof(priv->phy_name), PHY_ID_FMT,
+		 priv->mdio->id, priv->phy_addr);
+
+	priv->phydev = phy_connect(dev->net, priv->phy_name, &asix_adjust_link,
+				   PHY_INTERFACE_MODE_INTERNAL);
+	if (IS_ERR(priv->phydev)) {
+		netdev_err(dev->net, "Could not connect to PHY device %s\n",
+			   priv->phy_name);
+		ret = PTR_ERR(priv->phydev);
+		return ret;
+	}
+
+	phy_attached_info(priv->phydev);
+
+	return 0;
+}
+
 static int ax88772_bind(struct usbnet *dev, struct usb_interface *intf)
 {
-	int ret, i;
 	u8 buf[ETH_ALEN] = {0}, chipcode = 0;
-	u32 phyid;
 	struct asix_common_private *priv;
+	int ret, i;
+	u32 phyid;
 
 	usbnet_get_endpoints(dev, intf);
 
@@ -714,17 +739,6 @@ static int ax88772_bind(struct usbnet *dev, struct usb_interface *intf)
 
 	asix_set_netdev_dev_addr(dev, buf);
 
-	/* Initialize MII structure */
-	dev->mii.dev = dev->net;
-	dev->mii.mdio_read = asix_mdio_read;
-	dev->mii.mdio_write = asix_mdio_write;
-	dev->mii.phy_id_mask = 0x1f;
-	dev->mii.reg_num_mask = 0x1f;
-
-	dev->mii.phy_id = asix_read_phy_addr(dev, true);
-	if (dev->mii.phy_id < 0)
-		return dev->mii.phy_id;
-
 	dev->net->netdev_ops = &ax88772_netdev_ops;
 	dev->net->ethtool_ops = &ax88772_ethtool_ops;
 	dev->net->needed_headroom = 4; /* cf asix_tx_fixup() */
@@ -768,11 +782,31 @@ static int ax88772_bind(struct usbnet *dev, struct usb_interface *intf)
 		priv->suspend = ax88772_suspend;
 	}
 
+	ret = ax88772_init_mdio(dev);
+	if (ret)
+		return ret;
+
+	return ax88772_init_phy(dev);
+}
+
+static int ax88772_stop(struct usbnet *dev)
+{
+	struct asix_common_private *priv = dev->driver_priv;
+
+	/* On unplugged USB, we will get MDIO communication errors and the
+	 * PHY will be set in to PHY_HALTED state.
+	 */
+	if (priv->phydev->state != PHY_HALTED)
+		phy_stop(priv->phydev);
+
 	return 0;
 }
 
 static void ax88772_unbind(struct usbnet *dev, struct usb_interface *intf)
 {
+	struct asix_common_private *priv = dev->driver_priv;
+
+	phy_disconnect(priv->phydev);
 	asix_rx_fixup_common_free(dev->driver_priv);
 }
 
@@ -1161,8 +1195,8 @@ static const struct driver_info ax88772_info = {
 	.bind = ax88772_bind,
 	.unbind = ax88772_unbind,
 	.status = asix_status,
-	.link_reset = ax88772_link_reset,
 	.reset = ax88772_reset,
+	.stop = ax88772_stop,
 	.flags = FLAG_ETHER | FLAG_FRAMING_AX | FLAG_LINK_INTR | FLAG_MULTI_PACKET,
 	.rx_fixup = asix_rx_fixup_common,
 	.tx_fixup = asix_tx_fixup,
@@ -1173,7 +1207,6 @@ static const struct driver_info ax88772b_info = {
 	.bind = ax88772_bind,
 	.unbind = ax88772_unbind,
 	.status = asix_status,
-	.link_reset = ax88772_link_reset,
 	.reset = ax88772_reset,
 	.flags = FLAG_ETHER | FLAG_FRAMING_AX | FLAG_LINK_INTR |
 	         FLAG_MULTI_PACKET,
@@ -1209,7 +1242,6 @@ static const struct driver_info hg20f9_info = {
 	.bind = ax88772_bind,
 	.unbind = ax88772_unbind,
 	.status = asix_status,
-	.link_reset = ax88772_link_reset,
 	.reset = ax88772_reset,
 	.flags = FLAG_ETHER | FLAG_FRAMING_AX | FLAG_LINK_INTR |
 	         FLAG_MULTI_PACKET,
diff --git a/drivers/net/usb/ax88172a.c b/drivers/net/usb/ax88172a.c
index c8ca5187eece..2e2081346740 100644
--- a/drivers/net/usb/ax88172a.c
+++ b/drivers/net/usb/ax88172a.c
@@ -25,20 +25,6 @@ struct ax88172a_private {
 	struct asix_rx_fixup_info rx_fixup_info;
 };
 
-/* MDIO read and write wrappers for phylib */
-static int asix_mdio_bus_read(struct mii_bus *bus, int phy_id, int regnum)
-{
-	return asix_mdio_read(((struct usbnet *)bus->priv)->net, phy_id,
-			      regnum);
-}
-
-static int asix_mdio_bus_write(struct mii_bus *bus, int phy_id, int regnum,
-			       u16 val)
-{
-	asix_mdio_write(((struct usbnet *)bus->priv)->net, phy_id, regnum, val);
-	return 0;
-}
-
 /* set MAC link settings according to information from phylib */
 static void ax88172a_adjust_link(struct net_device *netdev)
 {
-- 
2.29.2