1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * ASIX AX88172A based USB 2.0 Ethernet Devices
4 * Copyright (C) 2012 OMICRON electronics GmbH
6 * Supports external PHYs via phylib. Based on the driver for the
7 * AX88772. Original copyrights follow:
12 * Copyright (c) 2002-2003 TiVo Inc.
16 #include <linux/phy.h>
18 struct ax88172a_private {
20 struct phy_device *phydev;
25 struct asix_rx_fixup_info rx_fixup_info;
28 /* MDIO read and write wrappers for phylib */
29 static int asix_mdio_bus_read(struct mii_bus *bus, int phy_id, int regnum)
31 return asix_mdio_read(((struct usbnet *)bus->priv)->net, phy_id,
35 static int asix_mdio_bus_write(struct mii_bus *bus, int phy_id, int regnum,
38 asix_mdio_write(((struct usbnet *)bus->priv)->net, phy_id, regnum, val);
42 /* set MAC link settings according to information from phylib */
43 static void ax88172a_adjust_link(struct net_device *netdev)
45 struct phy_device *phydev = netdev->phydev;
46 struct usbnet *dev = netdev_priv(netdev);
47 struct ax88172a_private *priv = dev->driver_priv;
51 mode = AX88772_MEDIUM_DEFAULT;
53 if (phydev->duplex == DUPLEX_HALF)
54 mode &= ~AX_MEDIUM_FD;
56 if (phydev->speed != SPEED_100)
57 mode &= ~AX_MEDIUM_PS;
60 if (mode != priv->oldmode) {
61 asix_write_medium_mode(dev, mode, 0);
63 netdev_dbg(netdev, "speed %u duplex %d, setting mode to 0x%04x\n",
64 phydev->speed, phydev->duplex, mode);
65 phy_print_status(phydev);
69 static void ax88172a_status(struct usbnet *dev, struct urb *urb)
71 /* link changes are detected by polling the phy */
74 /* use phylib infrastructure */
75 static int ax88172a_init_mdio(struct usbnet *dev)
77 struct ax88172a_private *priv = dev->driver_priv;
80 priv->mdio = mdiobus_alloc();
82 netdev_err(dev->net, "Could not allocate MDIO bus\n");
86 priv->mdio->priv = (void *)dev;
87 priv->mdio->read = &asix_mdio_bus_read;
88 priv->mdio->write = &asix_mdio_bus_write;
89 priv->mdio->name = "Asix MDIO Bus";
90 /* mii bus name is usb-<usb bus number>-<usb device number> */
91 snprintf(priv->mdio->id, MII_BUS_ID_SIZE, "usb-%03d:%03d",
92 dev->udev->bus->busnum, dev->udev->devnum);
94 ret = mdiobus_register(priv->mdio);
96 netdev_err(dev->net, "Could not register MDIO bus\n");
100 netdev_info(dev->net, "registered mdio bus %s\n", priv->mdio->id);
104 mdiobus_free(priv->mdio);
108 static void ax88172a_remove_mdio(struct usbnet *dev)
110 struct ax88172a_private *priv = dev->driver_priv;
112 netdev_info(dev->net, "deregistering mdio bus %s\n", priv->mdio->id);
113 mdiobus_unregister(priv->mdio);
114 mdiobus_free(priv->mdio);
117 static const struct net_device_ops ax88172a_netdev_ops = {
118 .ndo_open = usbnet_open,
119 .ndo_stop = usbnet_stop,
120 .ndo_start_xmit = usbnet_start_xmit,
121 .ndo_tx_timeout = usbnet_tx_timeout,
122 .ndo_change_mtu = usbnet_change_mtu,
123 .ndo_get_stats64 = dev_get_tstats64,
124 .ndo_set_mac_address = asix_set_mac_address,
125 .ndo_validate_addr = eth_validate_addr,
126 .ndo_do_ioctl = phy_do_ioctl_running,
127 .ndo_set_rx_mode = asix_set_multicast,
130 static const struct ethtool_ops ax88172a_ethtool_ops = {
131 .get_drvinfo = asix_get_drvinfo,
132 .get_link = usbnet_get_link,
133 .get_msglevel = usbnet_get_msglevel,
134 .set_msglevel = usbnet_set_msglevel,
135 .get_wol = asix_get_wol,
136 .set_wol = asix_set_wol,
137 .get_eeprom_len = asix_get_eeprom_len,
138 .get_eeprom = asix_get_eeprom,
139 .set_eeprom = asix_set_eeprom,
140 .nway_reset = phy_ethtool_nway_reset,
141 .get_link_ksettings = phy_ethtool_get_link_ksettings,
142 .set_link_ksettings = phy_ethtool_set_link_ksettings,
145 static int ax88172a_reset_phy(struct usbnet *dev, int embd_phy)
149 ret = asix_sw_reset(dev, AX_SWRESET_IPPD, 0);
154 ret = asix_sw_reset(dev, AX_SWRESET_CLEAR, 0);
160 ret = asix_sw_reset(dev, embd_phy ? AX_SWRESET_IPRL : AX_SWRESET_IPPD,
172 static int ax88172a_bind(struct usbnet *dev, struct usb_interface *intf)
176 struct ax88172a_private *priv;
178 usbnet_get_endpoints(dev, intf);
180 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
184 dev->driver_priv = priv;
186 /* Get the MAC address */
187 ret = asix_read_cmd(dev, AX_CMD_READ_NODE_ID, 0, 0, ETH_ALEN, buf, 0);
188 if (ret < ETH_ALEN) {
189 netdev_err(dev->net, "Failed to read MAC address: %d\n", ret);
193 memcpy(dev->net->dev_addr, buf, ETH_ALEN);
195 dev->net->netdev_ops = &ax88172a_netdev_ops;
196 dev->net->ethtool_ops = &ax88172a_ethtool_ops;
198 /* are we using the internal or the external phy? */
199 ret = asix_read_cmd(dev, AX_CMD_SW_PHY_STATUS, 0, 0, 1, buf, 0);
201 netdev_err(dev->net, "Failed to read software interface selection register: %d\n",
206 netdev_dbg(dev->net, "AX_CMD_SW_PHY_STATUS = 0x%02x\n", buf[0]);
207 switch (buf[0] & AX_PHY_SELECT_MASK) {
208 case AX_PHY_SELECT_INTERNAL:
209 netdev_dbg(dev->net, "use internal phy\n");
210 priv->use_embdphy = 1;
212 case AX_PHY_SELECT_EXTERNAL:
213 netdev_dbg(dev->net, "use external phy\n");
214 priv->use_embdphy = 0;
217 netdev_err(dev->net, "Interface mode not supported by driver\n");
222 priv->phy_addr = asix_read_phy_addr(dev, priv->use_embdphy);
223 ax88172a_reset_phy(dev, priv->use_embdphy);
225 /* Asix framing packs multiple eth frames into a 2K usb bulk transfer */
226 if (dev->driver_info->flags & FLAG_FRAMING_AX) {
227 /* hard_mtu is still the default - the device does not support
229 dev->rx_urb_size = 2048;
233 ret = ax88172a_init_mdio(dev);
244 static int ax88172a_stop(struct usbnet *dev)
246 struct ax88172a_private *priv = dev->driver_priv;
248 netdev_dbg(dev->net, "Stopping interface\n");
251 netdev_info(dev->net, "Disconnecting from phy %s\n",
253 phy_stop(priv->phydev);
254 phy_disconnect(priv->phydev);
260 static void ax88172a_unbind(struct usbnet *dev, struct usb_interface *intf)
262 struct ax88172a_private *priv = dev->driver_priv;
264 ax88172a_remove_mdio(dev);
268 static int ax88172a_reset(struct usbnet *dev)
270 struct asix_data *data = (struct asix_data *)&dev->data;
271 struct ax88172a_private *priv = dev->driver_priv;
275 ax88172a_reset_phy(dev, priv->use_embdphy);
278 rx_ctl = asix_read_rx_ctl(dev, 0);
279 netdev_dbg(dev->net, "RX_CTL is 0x%04x after software reset\n", rx_ctl);
280 ret = asix_write_rx_ctl(dev, 0x0000, 0);
284 rx_ctl = asix_read_rx_ctl(dev, 0);
285 netdev_dbg(dev->net, "RX_CTL is 0x%04x setting to 0x0000\n", rx_ctl);
289 ret = asix_write_cmd(dev, AX_CMD_WRITE_IPG0,
290 AX88772_IPG0_DEFAULT | AX88772_IPG1_DEFAULT,
291 AX88772_IPG2_DEFAULT, 0, NULL, 0);
293 netdev_err(dev->net, "Write IPG,IPG1,IPG2 failed: %d\n", ret);
297 /* Rewrite MAC address */
298 memcpy(data->mac_addr, dev->net->dev_addr, ETH_ALEN);
299 ret = asix_write_cmd(dev, AX_CMD_WRITE_NODE_ID, 0, 0, ETH_ALEN,
304 /* Set RX_CTL to default values with 2k buffer, and enable cactus */
305 ret = asix_write_rx_ctl(dev, AX_DEFAULT_RX_CTL, 0);
309 rx_ctl = asix_read_rx_ctl(dev, 0);
310 netdev_dbg(dev->net, "RX_CTL is 0x%04x after all initializations\n",
313 rx_ctl = asix_read_medium_status(dev, 0);
314 netdev_dbg(dev->net, "Medium Status is 0x%04x after all initializations\n",
318 snprintf(priv->phy_name, 20, PHY_ID_FMT,
319 priv->mdio->id, priv->phy_addr);
321 priv->phydev = phy_connect(dev->net, priv->phy_name,
322 &ax88172a_adjust_link,
323 PHY_INTERFACE_MODE_MII);
324 if (IS_ERR(priv->phydev)) {
325 netdev_err(dev->net, "Could not connect to PHY device %s\n",
327 ret = PTR_ERR(priv->phydev);
331 netdev_info(dev->net, "Connected to phy %s\n", priv->phy_name);
333 /* During power-up, the AX88172A set the power down (BMCR_PDOWN)
334 * bit of the PHY. Bring the PHY up again.
336 genphy_resume(priv->phydev);
337 phy_start(priv->phydev);
346 static int ax88172a_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
348 struct ax88172a_private *dp = dev->driver_priv;
349 struct asix_rx_fixup_info *rx = &dp->rx_fixup_info;
351 return asix_rx_fixup_internal(dev, skb, rx);
354 const struct driver_info ax88172a_info = {
355 .description = "ASIX AX88172A USB 2.0 Ethernet",
356 .bind = ax88172a_bind,
357 .reset = ax88172a_reset,
358 .stop = ax88172a_stop,
359 .unbind = ax88172a_unbind,
360 .status = ax88172a_status,
361 .flags = FLAG_ETHER | FLAG_FRAMING_AX | FLAG_LINK_INTR |
363 .rx_fixup = ax88172a_rx_fixup,
364 .tx_fixup = asix_tx_fixup,