1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * ASIX AX88172A based USB 2.0 Ethernet Devices 4 * Copyright (C) 2012 OMICRON electronics GmbH 5 * 6 * Supports external PHYs via phylib. Based on the driver for the 7 * AX88772. Original copyrights follow: 8 * 9 * Copyright (C) 2003-2006 David Hollis <dhollis@davehollis.com> 10 * Copyright (C) 2005 Phil Chang <pchang23@sbcglobal.net> 11 * Copyright (C) 2006 James Painter <jamie.painter@iname.com> 12 * Copyright (c) 2002-2003 TiVo Inc. 13 */ 14 15 #include "asix.h" 16 #include <linux/phy.h> 17 18 struct ax88172a_private { 19 struct mii_bus *mdio; 20 struct phy_device *phydev; 21 char phy_name[20]; 22 u16 phy_addr; 23 u16 oldmode; 24 int use_embdphy; 25 struct asix_rx_fixup_info rx_fixup_info; 26 }; 27 28 /* set MAC link settings according to information from phylib */ 29 static void ax88172a_adjust_link(struct net_device *netdev) 30 { 31 struct phy_device *phydev = netdev->phydev; 32 struct usbnet *dev = netdev_priv(netdev); 33 struct ax88172a_private *priv = dev->driver_priv; 34 u16 mode = 0; 35 36 if (phydev->link) { 37 mode = AX88772_MEDIUM_DEFAULT; 38 39 if (phydev->duplex == DUPLEX_HALF) 40 mode &= ~AX_MEDIUM_FD; 41 42 if (phydev->speed != SPEED_100) 43 mode &= ~AX_MEDIUM_PS; 44 } 45 46 if (mode != priv->oldmode) { 47 asix_write_medium_mode(dev, mode, 0); 48 priv->oldmode = mode; 49 netdev_dbg(netdev, "speed %u duplex %d, setting mode to 0x%04x\n", 50 phydev->speed, phydev->duplex, mode); 51 phy_print_status(phydev); 52 } 53 } 54 55 static void ax88172a_status(struct usbnet *dev, struct urb *urb) 56 { 57 /* link changes are detected by polling the phy */ 58 } 59 60 /* use phylib infrastructure */ 61 static int ax88172a_init_mdio(struct usbnet *dev) 62 { 63 struct ax88172a_private *priv = dev->driver_priv; 64 int ret; 65 66 priv->mdio = mdiobus_alloc(); 67 if (!priv->mdio) { 68 netdev_err(dev->net, "Could not allocate MDIO bus\n"); 69 return -ENOMEM; 70 } 71 72 priv->mdio->priv = (void *)dev; 73 priv->mdio->read = &asix_mdio_bus_read; 74 priv->mdio->write = &asix_mdio_bus_write; 75 priv->mdio->name = "Asix MDIO Bus"; 76 /* mii bus name is usb-<usb bus number>-<usb device number> */ 77 snprintf(priv->mdio->id, MII_BUS_ID_SIZE, "usb-%03d:%03d", 78 dev->udev->bus->busnum, dev->udev->devnum); 79 80 ret = mdiobus_register(priv->mdio); 81 if (ret) { 82 netdev_err(dev->net, "Could not register MDIO bus\n"); 83 goto mfree; 84 } 85 86 netdev_info(dev->net, "registered mdio bus %s\n", priv->mdio->id); 87 return 0; 88 89 mfree: 90 mdiobus_free(priv->mdio); 91 return ret; 92 } 93 94 static void ax88172a_remove_mdio(struct usbnet *dev) 95 { 96 struct ax88172a_private *priv = dev->driver_priv; 97 98 netdev_info(dev->net, "deregistering mdio bus %s\n", priv->mdio->id); 99 mdiobus_unregister(priv->mdio); 100 mdiobus_free(priv->mdio); 101 } 102 103 static const struct net_device_ops ax88172a_netdev_ops = { 104 .ndo_open = usbnet_open, 105 .ndo_stop = usbnet_stop, 106 .ndo_start_xmit = usbnet_start_xmit, 107 .ndo_tx_timeout = usbnet_tx_timeout, 108 .ndo_change_mtu = usbnet_change_mtu, 109 .ndo_get_stats64 = dev_get_tstats64, 110 .ndo_set_mac_address = asix_set_mac_address, 111 .ndo_validate_addr = eth_validate_addr, 112 .ndo_eth_ioctl = phy_do_ioctl_running, 113 .ndo_set_rx_mode = asix_set_multicast, 114 }; 115 116 static const struct ethtool_ops ax88172a_ethtool_ops = { 117 .get_drvinfo = asix_get_drvinfo, 118 .get_link = usbnet_get_link, 119 .get_msglevel = usbnet_get_msglevel, 120 .set_msglevel = usbnet_set_msglevel, 121 .get_wol = asix_get_wol, 122 .set_wol = asix_set_wol, 123 .get_eeprom_len = asix_get_eeprom_len, 124 .get_eeprom = asix_get_eeprom, 125 .set_eeprom = asix_set_eeprom, 126 .nway_reset = phy_ethtool_nway_reset, 127 .get_link_ksettings = phy_ethtool_get_link_ksettings, 128 .set_link_ksettings = phy_ethtool_set_link_ksettings, 129 }; 130 131 static int ax88172a_reset_phy(struct usbnet *dev, int embd_phy) 132 { 133 int ret; 134 135 ret = asix_sw_reset(dev, AX_SWRESET_IPPD, 0); 136 if (ret < 0) 137 goto err; 138 139 msleep(150); 140 ret = asix_sw_reset(dev, AX_SWRESET_CLEAR, 0); 141 if (ret < 0) 142 goto err; 143 144 msleep(150); 145 146 ret = asix_sw_reset(dev, embd_phy ? AX_SWRESET_IPRL : AX_SWRESET_IPPD, 147 0); 148 if (ret < 0) 149 goto err; 150 151 return 0; 152 153 err: 154 return ret; 155 } 156 157 158 static int ax88172a_bind(struct usbnet *dev, struct usb_interface *intf) 159 { 160 int ret; 161 u8 buf[ETH_ALEN]; 162 struct ax88172a_private *priv; 163 164 ret = usbnet_get_endpoints(dev, intf); 165 if (ret) 166 return ret; 167 168 priv = kzalloc(sizeof(*priv), GFP_KERNEL); 169 if (!priv) 170 return -ENOMEM; 171 172 dev->driver_priv = priv; 173 174 /* Get the MAC address */ 175 ret = asix_read_cmd(dev, AX_CMD_READ_NODE_ID, 0, 0, ETH_ALEN, buf, 0); 176 if (ret < ETH_ALEN) { 177 netdev_err(dev->net, "Failed to read MAC address: %d\n", ret); 178 ret = -EIO; 179 goto free; 180 } 181 eth_hw_addr_set(dev->net, buf); 182 183 dev->net->netdev_ops = &ax88172a_netdev_ops; 184 dev->net->ethtool_ops = &ax88172a_ethtool_ops; 185 186 /* are we using the internal or the external phy? */ 187 ret = asix_read_cmd(dev, AX_CMD_SW_PHY_STATUS, 0, 0, 1, buf, 0); 188 if (ret < 0) { 189 netdev_err(dev->net, "Failed to read software interface selection register: %d\n", 190 ret); 191 goto free; 192 } 193 194 netdev_dbg(dev->net, "AX_CMD_SW_PHY_STATUS = 0x%02x\n", buf[0]); 195 switch (buf[0] & AX_PHY_SELECT_MASK) { 196 case AX_PHY_SELECT_INTERNAL: 197 netdev_dbg(dev->net, "use internal phy\n"); 198 priv->use_embdphy = 1; 199 break; 200 case AX_PHY_SELECT_EXTERNAL: 201 netdev_dbg(dev->net, "use external phy\n"); 202 priv->use_embdphy = 0; 203 break; 204 default: 205 netdev_err(dev->net, "Interface mode not supported by driver\n"); 206 ret = -ENOTSUPP; 207 goto free; 208 } 209 210 ret = asix_read_phy_addr(dev, priv->use_embdphy); 211 if (ret < 0) 212 goto free; 213 214 priv->phy_addr = ret; 215 216 ax88172a_reset_phy(dev, priv->use_embdphy); 217 218 /* Asix framing packs multiple eth frames into a 2K usb bulk transfer */ 219 if (dev->driver_info->flags & FLAG_FRAMING_AX) { 220 /* hard_mtu is still the default - the device does not support 221 jumbo eth frames */ 222 dev->rx_urb_size = 2048; 223 } 224 225 /* init MDIO bus */ 226 ret = ax88172a_init_mdio(dev); 227 if (ret) 228 goto free; 229 230 return 0; 231 232 free: 233 kfree(priv); 234 return ret; 235 } 236 237 static int ax88172a_stop(struct usbnet *dev) 238 { 239 struct ax88172a_private *priv = dev->driver_priv; 240 241 netdev_dbg(dev->net, "Stopping interface\n"); 242 243 if (priv->phydev) { 244 netdev_info(dev->net, "Disconnecting from phy %s\n", 245 priv->phy_name); 246 phy_stop(priv->phydev); 247 phy_disconnect(priv->phydev); 248 } 249 250 return 0; 251 } 252 253 static void ax88172a_unbind(struct usbnet *dev, struct usb_interface *intf) 254 { 255 struct ax88172a_private *priv = dev->driver_priv; 256 257 ax88172a_remove_mdio(dev); 258 kfree(priv); 259 } 260 261 static int ax88172a_reset(struct usbnet *dev) 262 { 263 struct asix_data *data = (struct asix_data *)&dev->data; 264 struct ax88172a_private *priv = dev->driver_priv; 265 int ret; 266 u16 rx_ctl; 267 268 ax88172a_reset_phy(dev, priv->use_embdphy); 269 270 msleep(150); 271 rx_ctl = asix_read_rx_ctl(dev, 0); 272 netdev_dbg(dev->net, "RX_CTL is 0x%04x after software reset\n", rx_ctl); 273 ret = asix_write_rx_ctl(dev, 0x0000, 0); 274 if (ret < 0) 275 goto out; 276 277 rx_ctl = asix_read_rx_ctl(dev, 0); 278 netdev_dbg(dev->net, "RX_CTL is 0x%04x setting to 0x0000\n", rx_ctl); 279 280 msleep(150); 281 282 ret = asix_write_cmd(dev, AX_CMD_WRITE_IPG0, 283 AX88772_IPG0_DEFAULT | AX88772_IPG1_DEFAULT, 284 AX88772_IPG2_DEFAULT, 0, NULL, 0); 285 if (ret < 0) { 286 netdev_err(dev->net, "Write IPG,IPG1,IPG2 failed: %d\n", ret); 287 goto out; 288 } 289 290 /* Rewrite MAC address */ 291 memcpy(data->mac_addr, dev->net->dev_addr, ETH_ALEN); 292 ret = asix_write_cmd(dev, AX_CMD_WRITE_NODE_ID, 0, 0, ETH_ALEN, 293 data->mac_addr, 0); 294 if (ret < 0) 295 goto out; 296 297 /* Set RX_CTL to default values with 2k buffer, and enable cactus */ 298 ret = asix_write_rx_ctl(dev, AX_DEFAULT_RX_CTL, 0); 299 if (ret < 0) 300 goto out; 301 302 rx_ctl = asix_read_rx_ctl(dev, 0); 303 netdev_dbg(dev->net, "RX_CTL is 0x%04x after all initializations\n", 304 rx_ctl); 305 306 rx_ctl = asix_read_medium_status(dev, 0); 307 netdev_dbg(dev->net, "Medium Status is 0x%04x after all initializations\n", 308 rx_ctl); 309 310 /* Connect to PHY */ 311 snprintf(priv->phy_name, 20, PHY_ID_FMT, 312 priv->mdio->id, priv->phy_addr); 313 314 priv->phydev = phy_connect(dev->net, priv->phy_name, 315 &ax88172a_adjust_link, 316 PHY_INTERFACE_MODE_MII); 317 if (IS_ERR(priv->phydev)) { 318 netdev_err(dev->net, "Could not connect to PHY device %s\n", 319 priv->phy_name); 320 ret = PTR_ERR(priv->phydev); 321 goto out; 322 } 323 324 netdev_info(dev->net, "Connected to phy %s\n", priv->phy_name); 325 326 /* During power-up, the AX88172A set the power down (BMCR_PDOWN) 327 * bit of the PHY. Bring the PHY up again. 328 */ 329 genphy_resume(priv->phydev); 330 phy_start(priv->phydev); 331 332 return 0; 333 334 out: 335 return ret; 336 337 } 338 339 static int ax88172a_rx_fixup(struct usbnet *dev, struct sk_buff *skb) 340 { 341 struct ax88172a_private *dp = dev->driver_priv; 342 struct asix_rx_fixup_info *rx = &dp->rx_fixup_info; 343 344 return asix_rx_fixup_internal(dev, skb, rx); 345 } 346 347 const struct driver_info ax88172a_info = { 348 .description = "ASIX AX88172A USB 2.0 Ethernet", 349 .bind = ax88172a_bind, 350 .reset = ax88172a_reset, 351 .stop = ax88172a_stop, 352 .unbind = ax88172a_unbind, 353 .status = ax88172a_status, 354 .flags = FLAG_ETHER | FLAG_FRAMING_AX | FLAG_LINK_INTR | 355 FLAG_MULTI_PACKET, 356 .rx_fixup = ax88172a_rx_fixup, 357 .tx_fixup = asix_tx_fixup, 358 }; 359