1 files changed, 367 insertions, 0 deletions
diff --git a/drivers/net/usb/ax88172a.c b/drivers/net/usb/ax88172a.c
new file mode 100644
index 000000000..2bdb163e4
--- /dev/null
+++ b/drivers/net/usb/ax88172a.c
@@ -0,0 +1,367 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * ASIX AX88172A based USB 2.0 Ethernet Devices
+ * Copyright (C) 2012 OMICRON electronics GmbH
+ *
+ * Supports external PHYs via phylib. Based on the driver for the
+ * AX88772. Original copyrights follow:
+ *
+ * Copyright (C) 2003-2006 David Hollis <dhollis@davehollis.com>
+ * Copyright (C) 2005 Phil Chang <pchang23@sbcglobal.net>
+ * Copyright (C) 2006 James Painter <jamie.painter@iname.com>
+ * Copyright (c) 2002-2003 TiVo Inc.
+ */
+
+#include "asix.h"
+#include <linux/phy.h>
+
+struct ax88172a_private {
+	struct mii_bus *mdio;
+	struct phy_device *phydev;
+	char phy_name[20];
+	u16 phy_addr;
+	u16 oldmode;
+	int use_embdphy;
+	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)
+{
+	struct phy_device *phydev = netdev->phydev;
+	struct usbnet *dev = netdev_priv(netdev);
+	struct ax88172a_private *priv = dev->driver_priv;
+	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;
+	}
+
+	if (mode != priv->oldmode) {
+		asix_write_medium_mode(dev, mode, 0);
+		priv->oldmode = mode;
+		netdev_dbg(netdev, "speed %u duplex %d, setting mode to 0x%04x\n",
+			   phydev->speed, phydev->duplex, mode);
+		phy_print_status(phydev);
+	}
+}
+
+static void ax88172a_status(struct usbnet *dev, struct urb *urb)
+{
+	/* link changes are detected by polling the phy */
+}
+
+/* use phylib infrastructure */
+static int ax88172a_init_mdio(struct usbnet *dev)
+{
+	struct ax88172a_private *priv = dev->driver_priv;
+	int ret;
+
+	priv->mdio = mdiobus_alloc();
+	if (!priv->mdio) {
+		netdev_err(dev->net, "Could not allocate MDIO bus\n");
+		return -ENOMEM;
+	}
+
+	priv->mdio->priv = (void *)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);
+
+	ret = mdiobus_register(priv->mdio);
+	if (ret) {
+		netdev_err(dev->net, "Could not register MDIO bus\n");
+		goto mfree;
+	}
+
+	netdev_info(dev->net, "registered mdio bus %s\n", priv->mdio->id);
+	return 0;
+
+mfree:
+	mdiobus_free(priv->mdio);
+	return ret;
+}
+
+static void ax88172a_remove_mdio(struct usbnet *dev)
+{
+	struct ax88172a_private *priv = dev->driver_priv;
+
+	netdev_info(dev->net, "deregistering mdio bus %s\n", priv->mdio->id);
+	mdiobus_unregister(priv->mdio);
+	mdiobus_free(priv->mdio);
+}
+
+static const struct net_device_ops ax88172a_netdev_ops = {
+	.ndo_open		= usbnet_open,
+	.ndo_stop		= usbnet_stop,
+	.ndo_start_xmit		= usbnet_start_xmit,
+	.ndo_tx_timeout		= usbnet_tx_timeout,
+	.ndo_change_mtu		= usbnet_change_mtu,
+	.ndo_get_stats64	= usbnet_get_stats64,
+	.ndo_set_mac_address	= asix_set_mac_address,
+	.ndo_validate_addr	= eth_validate_addr,
+	.ndo_do_ioctl		= phy_do_ioctl_running,
+	.ndo_set_rx_mode        = asix_set_multicast,
+};
+
+static const struct ethtool_ops ax88172a_ethtool_ops = {
+	.get_drvinfo		= asix_get_drvinfo,
+	.get_link		= usbnet_get_link,
+	.get_msglevel		= usbnet_get_msglevel,
+	.set_msglevel		= usbnet_set_msglevel,
+	.get_wol		= asix_get_wol,
+	.set_wol		= asix_set_wol,
+	.get_eeprom_len		= asix_get_eeprom_len,
+	.get_eeprom		= asix_get_eeprom,
+	.set_eeprom		= asix_set_eeprom,
+	.nway_reset		= phy_ethtool_nway_reset,
+	.get_link_ksettings	= phy_ethtool_get_link_ksettings,
+	.set_link_ksettings	= phy_ethtool_set_link_ksettings,
+};
+
+static int ax88172a_reset_phy(struct usbnet *dev, int embd_phy)
+{
+	int ret;
+
+	ret = asix_sw_reset(dev, AX_SWRESET_IPPD, 0);
+	if (ret < 0)
+		goto err;
+
+	msleep(150);
+	ret = asix_sw_reset(dev, AX_SWRESET_CLEAR, 0);
+	if (ret < 0)
+		goto err;
+
+	msleep(150);
+
+	ret = asix_sw_reset(dev, embd_phy ? AX_SWRESET_IPRL : AX_SWRESET_IPPD,
+			    0);
+	if (ret < 0)
+		goto err;
+
+	return 0;
+
+err:
+	return ret;
+}
+
+
+static int ax88172a_bind(struct usbnet *dev, struct usb_interface *intf)
+{
+	int ret;
+	u8 buf[ETH_ALEN];
+	struct ax88172a_private *priv;
+
+	ret = usbnet_get_endpoints(dev, intf);
+	if (ret)
+		return ret;
+
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	if (!priv)
+		return -ENOMEM;
+
+	dev->driver_priv = priv;
+
+	/* Get the MAC address */
+	ret = asix_read_cmd(dev, AX_CMD_READ_NODE_ID, 0, 0, ETH_ALEN, buf, 0);
+	if (ret < ETH_ALEN) {
+		netdev_err(dev->net, "Failed to read MAC address: %d\n", ret);
+		ret = -EIO;
+		goto free;
+	}
+	memcpy(dev->net->dev_addr, buf, ETH_ALEN);
+
+	dev->net->netdev_ops = &ax88172a_netdev_ops;
+	dev->net->ethtool_ops = &ax88172a_ethtool_ops;
+
+	/* are we using the internal or the external phy? */
+	ret = asix_read_cmd(dev, AX_CMD_SW_PHY_STATUS, 0, 0, 1, buf, 0);
+	if (ret < 0) {
+		netdev_err(dev->net, "Failed to read software interface selection register: %d\n",
+			   ret);
+		goto free;
+	}
+
+	netdev_dbg(dev->net, "AX_CMD_SW_PHY_STATUS = 0x%02x\n", buf[0]);
+	switch (buf[0] & AX_PHY_SELECT_MASK) {
+	case AX_PHY_SELECT_INTERNAL:
+		netdev_dbg(dev->net, "use internal phy\n");
+		priv->use_embdphy = 1;
+		break;
+	case AX_PHY_SELECT_EXTERNAL:
+		netdev_dbg(dev->net, "use external phy\n");
+		priv->use_embdphy = 0;
+		break;
+	default:
+		netdev_err(dev->net, "Interface mode not supported by driver\n");
+		ret = -ENOTSUPP;
+		goto free;
+	}
+
+	priv->phy_addr = asix_read_phy_addr(dev, priv->use_embdphy);
+	ax88172a_reset_phy(dev, priv->use_embdphy);
+
+	/* Asix framing packs multiple eth frames into a 2K usb bulk transfer */
+	if (dev->driver_info->flags & FLAG_FRAMING_AX) {
+		/* hard_mtu  is still the default - the device does not support
+		   jumbo eth frames */
+		dev->rx_urb_size = 2048;
+	}
+
+	/* init MDIO bus */
+	ret = ax88172a_init_mdio(dev);
+	if (ret)
+		goto free;
+
+	return 0;
+
+free:
+	kfree(priv);
+	return ret;
+}
+
+static int ax88172a_stop(struct usbnet *dev)
+{
+	struct ax88172a_private *priv = dev->driver_priv;
+
+	netdev_dbg(dev->net, "Stopping interface\n");
+
+	if (priv->phydev) {
+		netdev_info(dev->net, "Disconnecting from phy %s\n",
+			    priv->phy_name);
+		phy_stop(priv->phydev);
+		phy_disconnect(priv->phydev);
+	}
+
+	return 0;
+}
+
+static void ax88172a_unbind(struct usbnet *dev, struct usb_interface *intf)
+{
+	struct ax88172a_private *priv = dev->driver_priv;
+
+	ax88172a_remove_mdio(dev);
+	kfree(priv);
+}
+
+static int ax88172a_reset(struct usbnet *dev)
+{
+	struct asix_data *data = (struct asix_data *)&dev->data;
+	struct ax88172a_private *priv = dev->driver_priv;
+	int ret;
+	u16 rx_ctl;
+
+	ax88172a_reset_phy(dev, priv->use_embdphy);
+
+	msleep(150);
+	rx_ctl = asix_read_rx_ctl(dev, 0);
+	netdev_dbg(dev->net, "RX_CTL is 0x%04x after software reset\n", rx_ctl);
+	ret = asix_write_rx_ctl(dev, 0x0000, 0);
+	if (ret < 0)
+		goto out;
+
+	rx_ctl = asix_read_rx_ctl(dev, 0);
+	netdev_dbg(dev->net, "RX_CTL is 0x%04x setting to 0x0000\n", rx_ctl);
+
+	msleep(150);
+
+	ret = asix_write_cmd(dev, AX_CMD_WRITE_IPG0,
+			     AX88772_IPG0_DEFAULT | AX88772_IPG1_DEFAULT,
+			     AX88772_IPG2_DEFAULT, 0, NULL, 0);
+	if (ret < 0) {
+		netdev_err(dev->net, "Write IPG,IPG1,IPG2 failed: %d\n", ret);
+		goto out;
+	}
+
+	/* Rewrite MAC address */
+	memcpy(data->mac_addr, dev->net->dev_addr, ETH_ALEN);
+	ret = asix_write_cmd(dev, AX_CMD_WRITE_NODE_ID, 0, 0, ETH_ALEN,
+			     data->mac_addr, 0);
+	if (ret < 0)
+		goto out;
+
+	/* Set RX_CTL to default values with 2k buffer, and enable cactus */
+	ret = asix_write_rx_ctl(dev, AX_DEFAULT_RX_CTL, 0);
+	if (ret < 0)
+		goto out;
+
+	rx_ctl = asix_read_rx_ctl(dev, 0);
+	netdev_dbg(dev->net, "RX_CTL is 0x%04x after all initializations\n",
+		   rx_ctl);
+
+	rx_ctl = asix_read_medium_status(dev, 0);
+	netdev_dbg(dev->net, "Medium Status is 0x%04x after all initializations\n",
+		   rx_ctl);
+
+	/* Connect to PHY */
+	snprintf(priv->phy_name, 20, PHY_ID_FMT,
+		 priv->mdio->id, priv->phy_addr);
+
+	priv->phydev = phy_connect(dev->net, priv->phy_name,
+				   &ax88172a_adjust_link,
+				   PHY_INTERFACE_MODE_MII);
+	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);
+		goto out;
+	}
+
+	netdev_info(dev->net, "Connected to phy %s\n", priv->phy_name);
+
+	/* During power-up, the AX88172A set the power down (BMCR_PDOWN)
+	 * bit of the PHY. Bring the PHY up again.
+	 */
+	genphy_resume(priv->phydev);
+	phy_start(priv->phydev);
+
+	return 0;
+
+out:
+	return ret;
+
+}
+
+static int ax88172a_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
+{
+	struct ax88172a_private *dp = dev->driver_priv;
+	struct asix_rx_fixup_info *rx = &dp->rx_fixup_info;
+
+	return asix_rx_fixup_internal(dev, skb, rx);
+}
+
+const struct driver_info ax88172a_info = {
+	.description = "ASIX AX88172A USB 2.0 Ethernet",
+	.bind = ax88172a_bind,
+	.reset = ax88172a_reset,
+	.stop = ax88172a_stop,
+	.unbind = ax88172a_unbind,
+	.status = ax88172a_status,
+	.flags = FLAG_ETHER | FLAG_FRAMING_AX | FLAG_LINK_INTR |
+		 FLAG_MULTI_PACKET,
+	.rx_fixup = ax88172a_rx_fixup,
+	.tx_fixup = asix_tx_fixup,
+};