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0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002  /***************************************************************************
0003  *
0004  * Copyright (C) 2007-2008 SMSC
0005  *
0006  *****************************************************************************/
0007 
0008 #include <linux/module.h>
0009 #include <linux/kmod.h>
0010 #include <linux/netdevice.h>
0011 #include <linux/etherdevice.h>
0012 #include <linux/ethtool.h>
0013 #include <linux/mii.h>
0014 #include <linux/usb.h>
0015 #include <linux/bitrev.h>
0016 #include <linux/crc16.h>
0017 #include <linux/crc32.h>
0018 #include <linux/usb/usbnet.h>
0019 #include <linux/slab.h>
0020 #include <linux/of_net.h>
0021 #include <linux/irq.h>
0022 #include <linux/irqdomain.h>
0023 #include <linux/mdio.h>
0024 #include <linux/phy.h>
0025 #include <net/selftests.h>
0026 
0027 #include "smsc95xx.h"
0028 
0029 #define SMSC_CHIPNAME           "smsc95xx"
0030 #define SMSC_DRIVER_VERSION     "2.0.0"
0031 #define HS_USB_PKT_SIZE         (512)
0032 #define FS_USB_PKT_SIZE         (64)
0033 #define DEFAULT_HS_BURST_CAP_SIZE   (16 * 1024 + 5 * HS_USB_PKT_SIZE)
0034 #define DEFAULT_FS_BURST_CAP_SIZE   (6 * 1024 + 33 * FS_USB_PKT_SIZE)
0035 #define DEFAULT_BULK_IN_DELAY       (0x00002000)
0036 #define MAX_SINGLE_PACKET_SIZE      (2048)
0037 #define LAN95XX_EEPROM_MAGIC        (0x9500)
0038 #define EEPROM_MAC_OFFSET       (0x01)
0039 #define DEFAULT_TX_CSUM_ENABLE      (true)
0040 #define DEFAULT_RX_CSUM_ENABLE      (true)
0041 #define SMSC95XX_INTERNAL_PHY_ID    (1)
0042 #define SMSC95XX_TX_OVERHEAD        (8)
0043 #define SMSC95XX_TX_OVERHEAD_CSUM   (12)
0044 #define SUPPORTED_WAKE          (WAKE_PHY | WAKE_UCAST | WAKE_BCAST | \
0045                      WAKE_MCAST | WAKE_ARP | WAKE_MAGIC)
0046 
0047 #define FEATURE_8_WAKEUP_FILTERS    (0x01)
0048 #define FEATURE_PHY_NLP_CROSSOVER   (0x02)
0049 #define FEATURE_REMOTE_WAKEUP       (0x04)
0050 
0051 #define SUSPEND_SUSPEND0        (0x01)
0052 #define SUSPEND_SUSPEND1        (0x02)
0053 #define SUSPEND_SUSPEND2        (0x04)
0054 #define SUSPEND_SUSPEND3        (0x08)
0055 #define SUSPEND_ALLMODES        (SUSPEND_SUSPEND0 | SUSPEND_SUSPEND1 | \
0056                      SUSPEND_SUSPEND2 | SUSPEND_SUSPEND3)
0057 
0058 #define SMSC95XX_NR_IRQS        (1) /* raise to 12 for GPIOs */
0059 #define PHY_HWIRQ           (SMSC95XX_NR_IRQS - 1)
0060 
0061 struct smsc95xx_priv {
0062     u32 mac_cr;
0063     u32 hash_hi;
0064     u32 hash_lo;
0065     u32 wolopts;
0066     spinlock_t mac_cr_lock;
0067     u8 features;
0068     u8 suspend_flags;
0069     struct irq_chip irqchip;
0070     struct irq_domain *irqdomain;
0071     struct fwnode_handle *irqfwnode;
0072     struct mii_bus *mdiobus;
0073     struct phy_device *phydev;
0074     struct task_struct *pm_task;
0075 };
0076 
0077 static bool turbo_mode = true;
0078 module_param(turbo_mode, bool, 0644);
0079 MODULE_PARM_DESC(turbo_mode, "Enable multiple frames per Rx transaction");
0080 
0081 static int __must_check smsc95xx_read_reg(struct usbnet *dev, u32 index,
0082                       u32 *data)
0083 {
0084     struct smsc95xx_priv *pdata = dev->driver_priv;
0085     u32 buf;
0086     int ret;
0087     int (*fn)(struct usbnet *, u8, u8, u16, u16, void *, u16);
0088 
0089     if (current != pdata->pm_task)
0090         fn = usbnet_read_cmd;
0091     else
0092         fn = usbnet_read_cmd_nopm;
0093 
0094     ret = fn(dev, USB_VENDOR_REQUEST_READ_REGISTER, USB_DIR_IN
0095          | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
0096          0, index, &buf, 4);
0097     if (ret < 0) {
0098         if (ret != -ENODEV)
0099             netdev_warn(dev->net, "Failed to read reg index 0x%08x: %d\n",
0100                     index, ret);
0101         return ret;
0102     }
0103 
0104     le32_to_cpus(&buf);
0105     *data = buf;
0106 
0107     return ret;
0108 }
0109 
0110 static int __must_check smsc95xx_write_reg(struct usbnet *dev, u32 index,
0111                        u32 data)
0112 {
0113     struct smsc95xx_priv *pdata = dev->driver_priv;
0114     u32 buf;
0115     int ret;
0116     int (*fn)(struct usbnet *, u8, u8, u16, u16, const void *, u16);
0117 
0118     if (current != pdata->pm_task)
0119         fn = usbnet_write_cmd;
0120     else
0121         fn = usbnet_write_cmd_nopm;
0122 
0123     buf = data;
0124     cpu_to_le32s(&buf);
0125 
0126     ret = fn(dev, USB_VENDOR_REQUEST_WRITE_REGISTER, USB_DIR_OUT
0127          | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
0128          0, index, &buf, 4);
0129     if (ret < 0 && ret != -ENODEV)
0130         netdev_warn(dev->net, "Failed to write reg index 0x%08x: %d\n",
0131                 index, ret);
0132 
0133     return ret;
0134 }
0135 
0136 /* Loop until the read is completed with timeout
0137  * called with phy_mutex held */
0138 static int __must_check smsc95xx_phy_wait_not_busy(struct usbnet *dev)
0139 {
0140     unsigned long start_time = jiffies;
0141     u32 val;
0142     int ret;
0143 
0144     do {
0145         ret = smsc95xx_read_reg(dev, MII_ADDR, &val);
0146         if (ret < 0) {
0147             /* Ignore -ENODEV error during disconnect() */
0148             if (ret == -ENODEV)
0149                 return 0;
0150             netdev_warn(dev->net, "Error reading MII_ACCESS\n");
0151             return ret;
0152         }
0153 
0154         if (!(val & MII_BUSY_))
0155             return 0;
0156     } while (!time_after(jiffies, start_time + HZ));
0157 
0158     return -EIO;
0159 }
0160 
0161 static u32 mii_address_cmd(int phy_id, int idx, u16 op)
0162 {
0163     return (phy_id & 0x1f) << 11 | (idx & 0x1f) << 6 | op;
0164 }
0165 
0166 static int smsc95xx_mdio_read(struct usbnet *dev, int phy_id, int idx)
0167 {
0168     u32 val, addr;
0169     int ret;
0170 
0171     mutex_lock(&dev->phy_mutex);
0172 
0173     /* confirm MII not busy */
0174     ret = smsc95xx_phy_wait_not_busy(dev);
0175     if (ret < 0) {
0176         netdev_warn(dev->net, "%s: MII is busy\n", __func__);
0177         goto done;
0178     }
0179 
0180     /* set the address, index & direction (read from PHY) */
0181     addr = mii_address_cmd(phy_id, idx, MII_READ_ | MII_BUSY_);
0182     ret = smsc95xx_write_reg(dev, MII_ADDR, addr);
0183     if (ret < 0) {
0184         if (ret != -ENODEV)
0185             netdev_warn(dev->net, "Error writing MII_ADDR\n");
0186         goto done;
0187     }
0188 
0189     ret = smsc95xx_phy_wait_not_busy(dev);
0190     if (ret < 0) {
0191         netdev_warn(dev->net, "Timed out reading MII reg %02X\n", idx);
0192         goto done;
0193     }
0194 
0195     ret = smsc95xx_read_reg(dev, MII_DATA, &val);
0196     if (ret < 0) {
0197         if (ret != -ENODEV)
0198             netdev_warn(dev->net, "Error reading MII_DATA\n");
0199         goto done;
0200     }
0201 
0202     ret = (u16)(val & 0xFFFF);
0203 
0204 done:
0205     mutex_unlock(&dev->phy_mutex);
0206 
0207     /* Ignore -ENODEV error during disconnect() */
0208     if (ret == -ENODEV)
0209         return 0;
0210     return ret;
0211 }
0212 
0213 static void smsc95xx_mdio_write(struct usbnet *dev, int phy_id, int idx,
0214                 int regval)
0215 {
0216     u32 val, addr;
0217     int ret;
0218 
0219     mutex_lock(&dev->phy_mutex);
0220 
0221     /* confirm MII not busy */
0222     ret = smsc95xx_phy_wait_not_busy(dev);
0223     if (ret < 0) {
0224         netdev_warn(dev->net, "%s: MII is busy\n", __func__);
0225         goto done;
0226     }
0227 
0228     val = regval;
0229     ret = smsc95xx_write_reg(dev, MII_DATA, val);
0230     if (ret < 0) {
0231         if (ret != -ENODEV)
0232             netdev_warn(dev->net, "Error writing MII_DATA\n");
0233         goto done;
0234     }
0235 
0236     /* set the address, index & direction (write to PHY) */
0237     addr = mii_address_cmd(phy_id, idx, MII_WRITE_ | MII_BUSY_);
0238     ret = smsc95xx_write_reg(dev, MII_ADDR, addr);
0239     if (ret < 0) {
0240         if (ret != -ENODEV)
0241             netdev_warn(dev->net, "Error writing MII_ADDR\n");
0242         goto done;
0243     }
0244 
0245     ret = smsc95xx_phy_wait_not_busy(dev);
0246     if (ret < 0) {
0247         netdev_warn(dev->net, "Timed out writing MII reg %02X\n", idx);
0248         goto done;
0249     }
0250 
0251 done:
0252     mutex_unlock(&dev->phy_mutex);
0253 }
0254 
0255 static int smsc95xx_mdiobus_read(struct mii_bus *bus, int phy_id, int idx)
0256 {
0257     struct usbnet *dev = bus->priv;
0258 
0259     return smsc95xx_mdio_read(dev, phy_id, idx);
0260 }
0261 
0262 static int smsc95xx_mdiobus_write(struct mii_bus *bus, int phy_id, int idx,
0263                   u16 regval)
0264 {
0265     struct usbnet *dev = bus->priv;
0266 
0267     smsc95xx_mdio_write(dev, phy_id, idx, regval);
0268     return 0;
0269 }
0270 
0271 static int __must_check smsc95xx_wait_eeprom(struct usbnet *dev)
0272 {
0273     unsigned long start_time = jiffies;
0274     u32 val;
0275     int ret;
0276 
0277     do {
0278         ret = smsc95xx_read_reg(dev, E2P_CMD, &val);
0279         if (ret < 0) {
0280             netdev_warn(dev->net, "Error reading E2P_CMD\n");
0281             return ret;
0282         }
0283 
0284         if (!(val & E2P_CMD_BUSY_) || (val & E2P_CMD_TIMEOUT_))
0285             break;
0286         udelay(40);
0287     } while (!time_after(jiffies, start_time + HZ));
0288 
0289     if (val & (E2P_CMD_TIMEOUT_ | E2P_CMD_BUSY_)) {
0290         netdev_warn(dev->net, "EEPROM read operation timeout\n");
0291         return -EIO;
0292     }
0293 
0294     return 0;
0295 }
0296 
0297 static int __must_check smsc95xx_eeprom_confirm_not_busy(struct usbnet *dev)
0298 {
0299     unsigned long start_time = jiffies;
0300     u32 val;
0301     int ret;
0302 
0303     do {
0304         ret = smsc95xx_read_reg(dev, E2P_CMD, &val);
0305         if (ret < 0) {
0306             netdev_warn(dev->net, "Error reading E2P_CMD\n");
0307             return ret;
0308         }
0309 
0310         if (!(val & E2P_CMD_BUSY_))
0311             return 0;
0312 
0313         udelay(40);
0314     } while (!time_after(jiffies, start_time + HZ));
0315 
0316     netdev_warn(dev->net, "EEPROM is busy\n");
0317     return -EIO;
0318 }
0319 
0320 static int smsc95xx_read_eeprom(struct usbnet *dev, u32 offset, u32 length,
0321                 u8 *data)
0322 {
0323     u32 val;
0324     int i, ret;
0325 
0326     BUG_ON(!dev);
0327     BUG_ON(!data);
0328 
0329     ret = smsc95xx_eeprom_confirm_not_busy(dev);
0330     if (ret)
0331         return ret;
0332 
0333     for (i = 0; i < length; i++) {
0334         val = E2P_CMD_BUSY_ | E2P_CMD_READ_ | (offset & E2P_CMD_ADDR_);
0335         ret = smsc95xx_write_reg(dev, E2P_CMD, val);
0336         if (ret < 0) {
0337             netdev_warn(dev->net, "Error writing E2P_CMD\n");
0338             return ret;
0339         }
0340 
0341         ret = smsc95xx_wait_eeprom(dev);
0342         if (ret < 0)
0343             return ret;
0344 
0345         ret = smsc95xx_read_reg(dev, E2P_DATA, &val);
0346         if (ret < 0) {
0347             netdev_warn(dev->net, "Error reading E2P_DATA\n");
0348             return ret;
0349         }
0350 
0351         data[i] = val & 0xFF;
0352         offset++;
0353     }
0354 
0355     return 0;
0356 }
0357 
0358 static int smsc95xx_write_eeprom(struct usbnet *dev, u32 offset, u32 length,
0359                  u8 *data)
0360 {
0361     u32 val;
0362     int i, ret;
0363 
0364     BUG_ON(!dev);
0365     BUG_ON(!data);
0366 
0367     ret = smsc95xx_eeprom_confirm_not_busy(dev);
0368     if (ret)
0369         return ret;
0370 
0371     /* Issue write/erase enable command */
0372     val = E2P_CMD_BUSY_ | E2P_CMD_EWEN_;
0373     ret = smsc95xx_write_reg(dev, E2P_CMD, val);
0374     if (ret < 0) {
0375         netdev_warn(dev->net, "Error writing E2P_DATA\n");
0376         return ret;
0377     }
0378 
0379     ret = smsc95xx_wait_eeprom(dev);
0380     if (ret < 0)
0381         return ret;
0382 
0383     for (i = 0; i < length; i++) {
0384 
0385         /* Fill data register */
0386         val = data[i];
0387         ret = smsc95xx_write_reg(dev, E2P_DATA, val);
0388         if (ret < 0) {
0389             netdev_warn(dev->net, "Error writing E2P_DATA\n");
0390             return ret;
0391         }
0392 
0393         /* Send "write" command */
0394         val = E2P_CMD_BUSY_ | E2P_CMD_WRITE_ | (offset & E2P_CMD_ADDR_);
0395         ret = smsc95xx_write_reg(dev, E2P_CMD, val);
0396         if (ret < 0) {
0397             netdev_warn(dev->net, "Error writing E2P_CMD\n");
0398             return ret;
0399         }
0400 
0401         ret = smsc95xx_wait_eeprom(dev);
0402         if (ret < 0)
0403             return ret;
0404 
0405         offset++;
0406     }
0407 
0408     return 0;
0409 }
0410 
0411 static int __must_check smsc95xx_write_reg_async(struct usbnet *dev, u16 index,
0412                          u32 data)
0413 {
0414     const u16 size = 4;
0415     u32 buf;
0416     int ret;
0417 
0418     buf = data;
0419     cpu_to_le32s(&buf);
0420 
0421     ret = usbnet_write_cmd_async(dev, USB_VENDOR_REQUEST_WRITE_REGISTER,
0422                      USB_DIR_OUT | USB_TYPE_VENDOR |
0423                      USB_RECIP_DEVICE,
0424                      0, index, &buf, size);
0425     if (ret < 0)
0426         netdev_warn(dev->net, "Error write async cmd, sts=%d\n",
0427                 ret);
0428     return ret;
0429 }
0430 
0431 /* returns hash bit number for given MAC address
0432  * example:
0433  * 01 00 5E 00 00 01 -> returns bit number 31 */
0434 static unsigned int smsc95xx_hash(char addr[ETH_ALEN])
0435 {
0436     return (ether_crc(ETH_ALEN, addr) >> 26) & 0x3f;
0437 }
0438 
0439 static void smsc95xx_set_multicast(struct net_device *netdev)
0440 {
0441     struct usbnet *dev = netdev_priv(netdev);
0442     struct smsc95xx_priv *pdata = dev->driver_priv;
0443     unsigned long flags;
0444     int ret;
0445 
0446     pdata->hash_hi = 0;
0447     pdata->hash_lo = 0;
0448 
0449     spin_lock_irqsave(&pdata->mac_cr_lock, flags);
0450 
0451     if (dev->net->flags & IFF_PROMISC) {
0452         netif_dbg(dev, drv, dev->net, "promiscuous mode enabled\n");
0453         pdata->mac_cr |= MAC_CR_PRMS_;
0454         pdata->mac_cr &= ~(MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
0455     } else if (dev->net->flags & IFF_ALLMULTI) {
0456         netif_dbg(dev, drv, dev->net, "receive all multicast enabled\n");
0457         pdata->mac_cr |= MAC_CR_MCPAS_;
0458         pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_HPFILT_);
0459     } else if (!netdev_mc_empty(dev->net)) {
0460         struct netdev_hw_addr *ha;
0461 
0462         pdata->mac_cr |= MAC_CR_HPFILT_;
0463         pdata->mac_cr &= ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_);
0464 
0465         netdev_for_each_mc_addr(ha, netdev) {
0466             u32 bitnum = smsc95xx_hash(ha->addr);
0467             u32 mask = 0x01 << (bitnum & 0x1F);
0468             if (bitnum & 0x20)
0469                 pdata->hash_hi |= mask;
0470             else
0471                 pdata->hash_lo |= mask;
0472         }
0473 
0474         netif_dbg(dev, drv, dev->net, "HASHH=0x%08X, HASHL=0x%08X\n",
0475                    pdata->hash_hi, pdata->hash_lo);
0476     } else {
0477         netif_dbg(dev, drv, dev->net, "receive own packets only\n");
0478         pdata->mac_cr &=
0479             ~(MAC_CR_PRMS_ | MAC_CR_MCPAS_ | MAC_CR_HPFILT_);
0480     }
0481 
0482     spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
0483 
0484     /* Initiate async writes, as we can't wait for completion here */
0485     ret = smsc95xx_write_reg_async(dev, HASHH, pdata->hash_hi);
0486     if (ret < 0)
0487         netdev_warn(dev->net, "failed to initiate async write to HASHH\n");
0488 
0489     ret = smsc95xx_write_reg_async(dev, HASHL, pdata->hash_lo);
0490     if (ret < 0)
0491         netdev_warn(dev->net, "failed to initiate async write to HASHL\n");
0492 
0493     ret = smsc95xx_write_reg_async(dev, MAC_CR, pdata->mac_cr);
0494     if (ret < 0)
0495         netdev_warn(dev->net, "failed to initiate async write to MAC_CR\n");
0496 }
0497 
0498 static int smsc95xx_phy_update_flowcontrol(struct usbnet *dev)
0499 {
0500     u32 flow = 0, afc_cfg;
0501     struct smsc95xx_priv *pdata = dev->driver_priv;
0502     bool tx_pause, rx_pause;
0503 
0504     int ret = smsc95xx_read_reg(dev, AFC_CFG, &afc_cfg);
0505     if (ret < 0)
0506         return ret;
0507 
0508     if (pdata->phydev->duplex == DUPLEX_FULL) {
0509         phy_get_pause(pdata->phydev, &tx_pause, &rx_pause);
0510 
0511         if (rx_pause)
0512             flow = 0xFFFF0002;
0513 
0514         if (tx_pause) {
0515             afc_cfg |= 0xF;
0516             flow |= 0xFFFF0000;
0517         } else {
0518             afc_cfg &= ~0xF;
0519         }
0520 
0521         netif_dbg(dev, link, dev->net, "rx pause %s, tx pause %s\n",
0522               rx_pause ? "enabled" : "disabled",
0523               tx_pause ? "enabled" : "disabled");
0524     } else {
0525         netif_dbg(dev, link, dev->net, "half duplex\n");
0526         afc_cfg |= 0xF;
0527     }
0528 
0529     ret = smsc95xx_write_reg(dev, FLOW, flow);
0530     if (ret < 0)
0531         return ret;
0532 
0533     return smsc95xx_write_reg(dev, AFC_CFG, afc_cfg);
0534 }
0535 
0536 static void smsc95xx_mac_update_fullduplex(struct usbnet *dev)
0537 {
0538     struct smsc95xx_priv *pdata = dev->driver_priv;
0539     unsigned long flags;
0540     int ret;
0541 
0542     spin_lock_irqsave(&pdata->mac_cr_lock, flags);
0543     if (pdata->phydev->duplex != DUPLEX_FULL) {
0544         pdata->mac_cr &= ~MAC_CR_FDPX_;
0545         pdata->mac_cr |= MAC_CR_RCVOWN_;
0546     } else {
0547         pdata->mac_cr &= ~MAC_CR_RCVOWN_;
0548         pdata->mac_cr |= MAC_CR_FDPX_;
0549     }
0550     spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
0551 
0552     ret = smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
0553     if (ret < 0) {
0554         if (ret != -ENODEV)
0555             netdev_warn(dev->net,
0556                     "Error updating MAC full duplex mode\n");
0557         return;
0558     }
0559 
0560     ret = smsc95xx_phy_update_flowcontrol(dev);
0561     if (ret < 0)
0562         netdev_warn(dev->net, "Error updating PHY flow control\n");
0563 }
0564 
0565 static void smsc95xx_status(struct usbnet *dev, struct urb *urb)
0566 {
0567     struct smsc95xx_priv *pdata = dev->driver_priv;
0568     unsigned long flags;
0569     u32 intdata;
0570 
0571     if (urb->actual_length != 4) {
0572         netdev_warn(dev->net, "unexpected urb length %d\n",
0573                 urb->actual_length);
0574         return;
0575     }
0576 
0577     intdata = get_unaligned_le32(urb->transfer_buffer);
0578     netif_dbg(dev, link, dev->net, "intdata: 0x%08X\n", intdata);
0579 
0580     local_irq_save(flags);
0581 
0582     if (intdata & INT_ENP_PHY_INT_)
0583         generic_handle_domain_irq(pdata->irqdomain, PHY_HWIRQ);
0584     else
0585         netdev_warn(dev->net, "unexpected interrupt, intdata=0x%08X\n",
0586                 intdata);
0587 
0588     local_irq_restore(flags);
0589 }
0590 
0591 /* Enable or disable Tx & Rx checksum offload engines */
0592 static int smsc95xx_set_features(struct net_device *netdev,
0593     netdev_features_t features)
0594 {
0595     struct usbnet *dev = netdev_priv(netdev);
0596     u32 read_buf;
0597     int ret;
0598 
0599     ret = smsc95xx_read_reg(dev, COE_CR, &read_buf);
0600     if (ret < 0)
0601         return ret;
0602 
0603     if (features & NETIF_F_IP_CSUM)
0604         read_buf |= Tx_COE_EN_;
0605     else
0606         read_buf &= ~Tx_COE_EN_;
0607 
0608     if (features & NETIF_F_RXCSUM)
0609         read_buf |= Rx_COE_EN_;
0610     else
0611         read_buf &= ~Rx_COE_EN_;
0612 
0613     ret = smsc95xx_write_reg(dev, COE_CR, read_buf);
0614     if (ret < 0)
0615         return ret;
0616 
0617     netif_dbg(dev, hw, dev->net, "COE_CR = 0x%08x\n", read_buf);
0618     return 0;
0619 }
0620 
0621 static int smsc95xx_ethtool_get_eeprom_len(struct net_device *net)
0622 {
0623     return MAX_EEPROM_SIZE;
0624 }
0625 
0626 static int smsc95xx_ethtool_get_eeprom(struct net_device *netdev,
0627                        struct ethtool_eeprom *ee, u8 *data)
0628 {
0629     struct usbnet *dev = netdev_priv(netdev);
0630 
0631     ee->magic = LAN95XX_EEPROM_MAGIC;
0632 
0633     return smsc95xx_read_eeprom(dev, ee->offset, ee->len, data);
0634 }
0635 
0636 static int smsc95xx_ethtool_set_eeprom(struct net_device *netdev,
0637                        struct ethtool_eeprom *ee, u8 *data)
0638 {
0639     struct usbnet *dev = netdev_priv(netdev);
0640 
0641     if (ee->magic != LAN95XX_EEPROM_MAGIC) {
0642         netdev_warn(dev->net, "EEPROM: magic value mismatch, magic = 0x%x\n",
0643                 ee->magic);
0644         return -EINVAL;
0645     }
0646 
0647     return smsc95xx_write_eeprom(dev, ee->offset, ee->len, data);
0648 }
0649 
0650 static int smsc95xx_ethtool_getregslen(struct net_device *netdev)
0651 {
0652     /* all smsc95xx registers */
0653     return COE_CR - ID_REV + sizeof(u32);
0654 }
0655 
0656 static void
0657 smsc95xx_ethtool_getregs(struct net_device *netdev, struct ethtool_regs *regs,
0658              void *buf)
0659 {
0660     struct usbnet *dev = netdev_priv(netdev);
0661     unsigned int i, j;
0662     int retval;
0663     u32 *data = buf;
0664 
0665     retval = smsc95xx_read_reg(dev, ID_REV, &regs->version);
0666     if (retval < 0) {
0667         netdev_warn(netdev, "REGS: cannot read ID_REV\n");
0668         return;
0669     }
0670 
0671     for (i = ID_REV, j = 0; i <= COE_CR; i += (sizeof(u32)), j++) {
0672         retval = smsc95xx_read_reg(dev, i, &data[j]);
0673         if (retval < 0) {
0674             netdev_warn(netdev, "REGS: cannot read reg[%x]\n", i);
0675             return;
0676         }
0677     }
0678 }
0679 
0680 static void smsc95xx_ethtool_get_wol(struct net_device *net,
0681                      struct ethtool_wolinfo *wolinfo)
0682 {
0683     struct usbnet *dev = netdev_priv(net);
0684     struct smsc95xx_priv *pdata = dev->driver_priv;
0685 
0686     wolinfo->supported = SUPPORTED_WAKE;
0687     wolinfo->wolopts = pdata->wolopts;
0688 }
0689 
0690 static int smsc95xx_ethtool_set_wol(struct net_device *net,
0691                     struct ethtool_wolinfo *wolinfo)
0692 {
0693     struct usbnet *dev = netdev_priv(net);
0694     struct smsc95xx_priv *pdata = dev->driver_priv;
0695     int ret;
0696 
0697     if (wolinfo->wolopts & ~SUPPORTED_WAKE)
0698         return -EINVAL;
0699 
0700     pdata->wolopts = wolinfo->wolopts & SUPPORTED_WAKE;
0701 
0702     ret = device_set_wakeup_enable(&dev->udev->dev, pdata->wolopts);
0703     if (ret < 0)
0704         netdev_warn(dev->net, "device_set_wakeup_enable error %d\n", ret);
0705 
0706     return ret;
0707 }
0708 
0709 static u32 smsc95xx_get_link(struct net_device *net)
0710 {
0711     phy_read_status(net->phydev);
0712     return net->phydev->link;
0713 }
0714 
0715 static void smsc95xx_ethtool_get_strings(struct net_device *netdev, u32 sset,
0716                     u8 *data)
0717 {
0718     switch (sset) {
0719     case ETH_SS_TEST:
0720         net_selftest_get_strings(data);
0721         break;
0722     }
0723 }
0724 
0725 static int smsc95xx_ethtool_get_sset_count(struct net_device *ndev, int sset)
0726 {
0727     switch (sset) {
0728     case ETH_SS_TEST:
0729         return net_selftest_get_count();
0730     default:
0731         return -EOPNOTSUPP;
0732     }
0733 }
0734 
0735 static const struct ethtool_ops smsc95xx_ethtool_ops = {
0736     .get_link   = smsc95xx_get_link,
0737     .nway_reset = phy_ethtool_nway_reset,
0738     .get_drvinfo    = usbnet_get_drvinfo,
0739     .get_msglevel   = usbnet_get_msglevel,
0740     .set_msglevel   = usbnet_set_msglevel,
0741     .get_eeprom_len = smsc95xx_ethtool_get_eeprom_len,
0742     .get_eeprom = smsc95xx_ethtool_get_eeprom,
0743     .set_eeprom = smsc95xx_ethtool_set_eeprom,
0744     .get_regs_len   = smsc95xx_ethtool_getregslen,
0745     .get_regs   = smsc95xx_ethtool_getregs,
0746     .get_wol    = smsc95xx_ethtool_get_wol,
0747     .set_wol    = smsc95xx_ethtool_set_wol,
0748     .get_link_ksettings = phy_ethtool_get_link_ksettings,
0749     .set_link_ksettings = phy_ethtool_set_link_ksettings,
0750     .get_ts_info    = ethtool_op_get_ts_info,
0751     .self_test  = net_selftest,
0752     .get_strings    = smsc95xx_ethtool_get_strings,
0753     .get_sset_count = smsc95xx_ethtool_get_sset_count,
0754 };
0755 
0756 static int smsc95xx_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
0757 {
0758     if (!netif_running(netdev))
0759         return -EINVAL;
0760 
0761     return phy_mii_ioctl(netdev->phydev, rq, cmd);
0762 }
0763 
0764 static void smsc95xx_init_mac_address(struct usbnet *dev)
0765 {
0766     u8 addr[ETH_ALEN];
0767 
0768     /* maybe the boot loader passed the MAC address in devicetree */
0769     if (!platform_get_ethdev_address(&dev->udev->dev, dev->net)) {
0770         if (is_valid_ether_addr(dev->net->dev_addr)) {
0771             /* device tree values are valid so use them */
0772             netif_dbg(dev, ifup, dev->net, "MAC address read from the device tree\n");
0773             return;
0774         }
0775     }
0776 
0777     /* try reading mac address from EEPROM */
0778     if (smsc95xx_read_eeprom(dev, EEPROM_MAC_OFFSET, ETH_ALEN, addr) == 0) {
0779         eth_hw_addr_set(dev->net, addr);
0780         if (is_valid_ether_addr(dev->net->dev_addr)) {
0781             /* eeprom values are valid so use them */
0782             netif_dbg(dev, ifup, dev->net, "MAC address read from EEPROM\n");
0783             return;
0784         }
0785     }
0786 
0787     /* no useful static MAC address found. generate a random one */
0788     eth_hw_addr_random(dev->net);
0789     netif_dbg(dev, ifup, dev->net, "MAC address set to eth_random_addr\n");
0790 }
0791 
0792 static int smsc95xx_set_mac_address(struct usbnet *dev)
0793 {
0794     u32 addr_lo = dev->net->dev_addr[0] | dev->net->dev_addr[1] << 8 |
0795         dev->net->dev_addr[2] << 16 | dev->net->dev_addr[3] << 24;
0796     u32 addr_hi = dev->net->dev_addr[4] | dev->net->dev_addr[5] << 8;
0797     int ret;
0798 
0799     ret = smsc95xx_write_reg(dev, ADDRL, addr_lo);
0800     if (ret < 0)
0801         return ret;
0802 
0803     return smsc95xx_write_reg(dev, ADDRH, addr_hi);
0804 }
0805 
0806 /* starts the TX path */
0807 static int smsc95xx_start_tx_path(struct usbnet *dev)
0808 {
0809     struct smsc95xx_priv *pdata = dev->driver_priv;
0810     unsigned long flags;
0811     int ret;
0812 
0813     /* Enable Tx at MAC */
0814     spin_lock_irqsave(&pdata->mac_cr_lock, flags);
0815     pdata->mac_cr |= MAC_CR_TXEN_;
0816     spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
0817 
0818     ret = smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
0819     if (ret < 0)
0820         return ret;
0821 
0822     /* Enable Tx at SCSRs */
0823     return smsc95xx_write_reg(dev, TX_CFG, TX_CFG_ON_);
0824 }
0825 
0826 /* Starts the Receive path */
0827 static int smsc95xx_start_rx_path(struct usbnet *dev)
0828 {
0829     struct smsc95xx_priv *pdata = dev->driver_priv;
0830     unsigned long flags;
0831 
0832     spin_lock_irqsave(&pdata->mac_cr_lock, flags);
0833     pdata->mac_cr |= MAC_CR_RXEN_;
0834     spin_unlock_irqrestore(&pdata->mac_cr_lock, flags);
0835 
0836     return smsc95xx_write_reg(dev, MAC_CR, pdata->mac_cr);
0837 }
0838 
0839 static int smsc95xx_reset(struct usbnet *dev)
0840 {
0841     struct smsc95xx_priv *pdata = dev->driver_priv;
0842     u32 read_buf, write_buf, burst_cap;
0843     int ret = 0, timeout;
0844 
0845     netif_dbg(dev, ifup, dev->net, "entering smsc95xx_reset\n");
0846 
0847     ret = smsc95xx_write_reg(dev, HW_CFG, HW_CFG_LRST_);
0848     if (ret < 0)
0849         return ret;
0850 
0851     timeout = 0;
0852     do {
0853         msleep(10);
0854         ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
0855         if (ret < 0)
0856             return ret;
0857         timeout++;
0858     } while ((read_buf & HW_CFG_LRST_) && (timeout < 100));
0859 
0860     if (timeout >= 100) {
0861         netdev_warn(dev->net, "timeout waiting for completion of Lite Reset\n");
0862         return ret;
0863     }
0864 
0865     ret = smsc95xx_set_mac_address(dev);
0866     if (ret < 0)
0867         return ret;
0868 
0869     netif_dbg(dev, ifup, dev->net, "MAC Address: %pM\n",
0870           dev->net->dev_addr);
0871 
0872     ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
0873     if (ret < 0)
0874         return ret;
0875 
0876     netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG : 0x%08x\n",
0877           read_buf);
0878 
0879     read_buf |= HW_CFG_BIR_;
0880 
0881     ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
0882     if (ret < 0)
0883         return ret;
0884 
0885     ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
0886     if (ret < 0)
0887         return ret;
0888 
0889     netif_dbg(dev, ifup, dev->net,
0890           "Read Value from HW_CFG after writing HW_CFG_BIR_: 0x%08x\n",
0891           read_buf);
0892 
0893     if (!turbo_mode) {
0894         burst_cap = 0;
0895         dev->rx_urb_size = MAX_SINGLE_PACKET_SIZE;
0896     } else if (dev->udev->speed == USB_SPEED_HIGH) {
0897         burst_cap = DEFAULT_HS_BURST_CAP_SIZE / HS_USB_PKT_SIZE;
0898         dev->rx_urb_size = DEFAULT_HS_BURST_CAP_SIZE;
0899     } else {
0900         burst_cap = DEFAULT_FS_BURST_CAP_SIZE / FS_USB_PKT_SIZE;
0901         dev->rx_urb_size = DEFAULT_FS_BURST_CAP_SIZE;
0902     }
0903 
0904     netif_dbg(dev, ifup, dev->net, "rx_urb_size=%ld\n",
0905           (ulong)dev->rx_urb_size);
0906 
0907     ret = smsc95xx_write_reg(dev, BURST_CAP, burst_cap);
0908     if (ret < 0)
0909         return ret;
0910 
0911     ret = smsc95xx_read_reg(dev, BURST_CAP, &read_buf);
0912     if (ret < 0)
0913         return ret;
0914 
0915     netif_dbg(dev, ifup, dev->net,
0916           "Read Value from BURST_CAP after writing: 0x%08x\n",
0917           read_buf);
0918 
0919     ret = smsc95xx_write_reg(dev, BULK_IN_DLY, DEFAULT_BULK_IN_DELAY);
0920     if (ret < 0)
0921         return ret;
0922 
0923     ret = smsc95xx_read_reg(dev, BULK_IN_DLY, &read_buf);
0924     if (ret < 0)
0925         return ret;
0926 
0927     netif_dbg(dev, ifup, dev->net,
0928           "Read Value from BULK_IN_DLY after writing: 0x%08x\n",
0929           read_buf);
0930 
0931     ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
0932     if (ret < 0)
0933         return ret;
0934 
0935     netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG: 0x%08x\n",
0936           read_buf);
0937 
0938     if (turbo_mode)
0939         read_buf |= (HW_CFG_MEF_ | HW_CFG_BCE_);
0940 
0941     read_buf &= ~HW_CFG_RXDOFF_;
0942 
0943     /* set Rx data offset=2, Make IP header aligns on word boundary. */
0944     read_buf |= NET_IP_ALIGN << 9;
0945 
0946     ret = smsc95xx_write_reg(dev, HW_CFG, read_buf);
0947     if (ret < 0)
0948         return ret;
0949 
0950     ret = smsc95xx_read_reg(dev, HW_CFG, &read_buf);
0951     if (ret < 0)
0952         return ret;
0953 
0954     netif_dbg(dev, ifup, dev->net,
0955           "Read Value from HW_CFG after writing: 0x%08x\n", read_buf);
0956 
0957     ret = smsc95xx_write_reg(dev, INT_STS, INT_STS_CLEAR_ALL_);
0958     if (ret < 0)
0959         return ret;
0960 
0961     ret = smsc95xx_read_reg(dev, ID_REV, &read_buf);
0962     if (ret < 0)
0963         return ret;
0964     netif_dbg(dev, ifup, dev->net, "ID_REV = 0x%08x\n", read_buf);
0965 
0966     /* Configure GPIO pins as LED outputs */
0967     write_buf = LED_GPIO_CFG_SPD_LED | LED_GPIO_CFG_LNK_LED |
0968         LED_GPIO_CFG_FDX_LED;
0969     ret = smsc95xx_write_reg(dev, LED_GPIO_CFG, write_buf);
0970     if (ret < 0)
0971         return ret;
0972 
0973     /* Init Tx */
0974     ret = smsc95xx_write_reg(dev, FLOW, 0);
0975     if (ret < 0)
0976         return ret;
0977 
0978     ret = smsc95xx_write_reg(dev, AFC_CFG, AFC_CFG_DEFAULT);
0979     if (ret < 0)
0980         return ret;
0981 
0982     /* Don't need mac_cr_lock during initialisation */
0983     ret = smsc95xx_read_reg(dev, MAC_CR, &pdata->mac_cr);
0984     if (ret < 0)
0985         return ret;
0986 
0987     /* Init Rx */
0988     /* Set Vlan */
0989     ret = smsc95xx_write_reg(dev, VLAN1, (u32)ETH_P_8021Q);
0990     if (ret < 0)
0991         return ret;
0992 
0993     /* Enable or disable checksum offload engines */
0994     ret = smsc95xx_set_features(dev->net, dev->net->features);
0995     if (ret < 0) {
0996         netdev_warn(dev->net, "Failed to set checksum offload features\n");
0997         return ret;
0998     }
0999 
1000     smsc95xx_set_multicast(dev->net);
1001 
1002     ret = smsc95xx_read_reg(dev, INT_EP_CTL, &read_buf);
1003     if (ret < 0)
1004         return ret;
1005 
1006     /* enable PHY interrupts */
1007     read_buf |= INT_EP_CTL_PHY_INT_;
1008 
1009     ret = smsc95xx_write_reg(dev, INT_EP_CTL, read_buf);
1010     if (ret < 0)
1011         return ret;
1012 
1013     ret = smsc95xx_start_tx_path(dev);
1014     if (ret < 0) {
1015         netdev_warn(dev->net, "Failed to start TX path\n");
1016         return ret;
1017     }
1018 
1019     ret = smsc95xx_start_rx_path(dev);
1020     if (ret < 0) {
1021         netdev_warn(dev->net, "Failed to start RX path\n");
1022         return ret;
1023     }
1024 
1025     netif_dbg(dev, ifup, dev->net, "smsc95xx_reset, return 0\n");
1026     return 0;
1027 }
1028 
1029 static const struct net_device_ops smsc95xx_netdev_ops = {
1030     .ndo_open       = usbnet_open,
1031     .ndo_stop       = usbnet_stop,
1032     .ndo_start_xmit     = usbnet_start_xmit,
1033     .ndo_tx_timeout     = usbnet_tx_timeout,
1034     .ndo_change_mtu     = usbnet_change_mtu,
1035     .ndo_get_stats64    = dev_get_tstats64,
1036     .ndo_set_mac_address    = eth_mac_addr,
1037     .ndo_validate_addr  = eth_validate_addr,
1038     .ndo_eth_ioctl      = smsc95xx_ioctl,
1039     .ndo_set_rx_mode    = smsc95xx_set_multicast,
1040     .ndo_set_features   = smsc95xx_set_features,
1041 };
1042 
1043 static void smsc95xx_handle_link_change(struct net_device *net)
1044 {
1045     struct usbnet *dev = netdev_priv(net);
1046 
1047     phy_print_status(net->phydev);
1048     smsc95xx_mac_update_fullduplex(dev);
1049     usbnet_defer_kevent(dev, EVENT_LINK_CHANGE);
1050 }
1051 
1052 static int smsc95xx_bind(struct usbnet *dev, struct usb_interface *intf)
1053 {
1054     struct smsc95xx_priv *pdata;
1055     bool is_internal_phy;
1056     char usb_path[64];
1057     int ret, phy_irq;
1058     u32 val;
1059 
1060     printk(KERN_INFO SMSC_CHIPNAME " v" SMSC_DRIVER_VERSION "\n");
1061 
1062     ret = usbnet_get_endpoints(dev, intf);
1063     if (ret < 0) {
1064         netdev_warn(dev->net, "usbnet_get_endpoints failed: %d\n", ret);
1065         return ret;
1066     }
1067 
1068     pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
1069     if (!pdata)
1070         return -ENOMEM;
1071 
1072     dev->driver_priv = pdata;
1073 
1074     spin_lock_init(&pdata->mac_cr_lock);
1075 
1076     /* LAN95xx devices do not alter the computed checksum of 0 to 0xffff.
1077      * RFC 2460, ipv6 UDP calculated checksum yields a result of zero must
1078      * be changed to 0xffff. RFC 768, ipv4 UDP computed checksum is zero,
1079      * it is transmitted as all ones. The zero transmitted checksum means
1080      * transmitter generated no checksum. Hence, enable csum offload only
1081      * for ipv4 packets.
1082      */
1083     if (DEFAULT_TX_CSUM_ENABLE)
1084         dev->net->features |= NETIF_F_IP_CSUM;
1085     if (DEFAULT_RX_CSUM_ENABLE)
1086         dev->net->features |= NETIF_F_RXCSUM;
1087 
1088     dev->net->hw_features = NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1089     set_bit(EVENT_NO_IP_ALIGN, &dev->flags);
1090 
1091     smsc95xx_init_mac_address(dev);
1092 
1093     /* Init all registers */
1094     ret = smsc95xx_reset(dev);
1095     if (ret)
1096         goto free_pdata;
1097 
1098     /* create irq domain for use by PHY driver and GPIO consumers */
1099     usb_make_path(dev->udev, usb_path, sizeof(usb_path));
1100     pdata->irqfwnode = irq_domain_alloc_named_fwnode(usb_path);
1101     if (!pdata->irqfwnode) {
1102         ret = -ENOMEM;
1103         goto free_pdata;
1104     }
1105 
1106     pdata->irqdomain = irq_domain_create_linear(pdata->irqfwnode,
1107                             SMSC95XX_NR_IRQS,
1108                             &irq_domain_simple_ops,
1109                             pdata);
1110     if (!pdata->irqdomain) {
1111         ret = -ENOMEM;
1112         goto free_irqfwnode;
1113     }
1114 
1115     phy_irq = irq_create_mapping(pdata->irqdomain, PHY_HWIRQ);
1116     if (!phy_irq) {
1117         ret = -ENOENT;
1118         goto remove_irqdomain;
1119     }
1120 
1121     pdata->irqchip = dummy_irq_chip;
1122     pdata->irqchip.name = SMSC_CHIPNAME;
1123     irq_set_chip_and_handler_name(phy_irq, &pdata->irqchip,
1124                       handle_simple_irq, "phy");
1125 
1126     pdata->mdiobus = mdiobus_alloc();
1127     if (!pdata->mdiobus) {
1128         ret = -ENOMEM;
1129         goto dispose_irq;
1130     }
1131 
1132     ret = smsc95xx_read_reg(dev, HW_CFG, &val);
1133     if (ret < 0)
1134         goto free_mdio;
1135 
1136     is_internal_phy = !(val & HW_CFG_PSEL_);
1137     if (is_internal_phy)
1138         pdata->mdiobus->phy_mask = ~(1u << SMSC95XX_INTERNAL_PHY_ID);
1139 
1140     pdata->mdiobus->priv = dev;
1141     pdata->mdiobus->read = smsc95xx_mdiobus_read;
1142     pdata->mdiobus->write = smsc95xx_mdiobus_write;
1143     pdata->mdiobus->name = "smsc95xx-mdiobus";
1144     pdata->mdiobus->parent = &dev->udev->dev;
1145 
1146     snprintf(pdata->mdiobus->id, ARRAY_SIZE(pdata->mdiobus->id),
1147          "usb-%03d:%03d", dev->udev->bus->busnum, dev->udev->devnum);
1148 
1149     ret = mdiobus_register(pdata->mdiobus);
1150     if (ret) {
1151         netdev_err(dev->net, "Could not register MDIO bus\n");
1152         goto free_mdio;
1153     }
1154 
1155     pdata->phydev = phy_find_first(pdata->mdiobus);
1156     if (!pdata->phydev) {
1157         netdev_err(dev->net, "no PHY found\n");
1158         ret = -ENODEV;
1159         goto unregister_mdio;
1160     }
1161 
1162     pdata->phydev->irq = phy_irq;
1163     pdata->phydev->is_internal = is_internal_phy;
1164 
1165     /* detect device revision as different features may be available */
1166     ret = smsc95xx_read_reg(dev, ID_REV, &val);
1167     if (ret < 0)
1168         goto unregister_mdio;
1169 
1170     val >>= 16;
1171     if ((val == ID_REV_CHIP_ID_9500A_) || (val == ID_REV_CHIP_ID_9530_) ||
1172         (val == ID_REV_CHIP_ID_89530_) || (val == ID_REV_CHIP_ID_9730_))
1173         pdata->features = (FEATURE_8_WAKEUP_FILTERS |
1174             FEATURE_PHY_NLP_CROSSOVER |
1175             FEATURE_REMOTE_WAKEUP);
1176     else if (val == ID_REV_CHIP_ID_9512_)
1177         pdata->features = FEATURE_8_WAKEUP_FILTERS;
1178 
1179     dev->net->netdev_ops = &smsc95xx_netdev_ops;
1180     dev->net->ethtool_ops = &smsc95xx_ethtool_ops;
1181     dev->net->flags |= IFF_MULTICAST;
1182     dev->net->hard_header_len += SMSC95XX_TX_OVERHEAD_CSUM;
1183     dev->net->min_mtu = ETH_MIN_MTU;
1184     dev->net->max_mtu = ETH_DATA_LEN;
1185     dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
1186 
1187     ret = phy_connect_direct(dev->net, pdata->phydev,
1188                  &smsc95xx_handle_link_change,
1189                  PHY_INTERFACE_MODE_MII);
1190     if (ret) {
1191         netdev_err(dev->net, "can't attach PHY to %s\n", pdata->mdiobus->id);
1192         goto unregister_mdio;
1193     }
1194 
1195     phy_attached_info(dev->net->phydev);
1196 
1197     return 0;
1198 
1199 unregister_mdio:
1200     mdiobus_unregister(pdata->mdiobus);
1201 
1202 free_mdio:
1203     mdiobus_free(pdata->mdiobus);
1204 
1205 dispose_irq:
1206     irq_dispose_mapping(phy_irq);
1207 
1208 remove_irqdomain:
1209     irq_domain_remove(pdata->irqdomain);
1210 
1211 free_irqfwnode:
1212     irq_domain_free_fwnode(pdata->irqfwnode);
1213 
1214 free_pdata:
1215     kfree(pdata);
1216     return ret;
1217 }
1218 
1219 static void smsc95xx_unbind(struct usbnet *dev, struct usb_interface *intf)
1220 {
1221     struct smsc95xx_priv *pdata = dev->driver_priv;
1222 
1223     phy_disconnect(dev->net->phydev);
1224     mdiobus_unregister(pdata->mdiobus);
1225     mdiobus_free(pdata->mdiobus);
1226     irq_dispose_mapping(irq_find_mapping(pdata->irqdomain, PHY_HWIRQ));
1227     irq_domain_remove(pdata->irqdomain);
1228     irq_domain_free_fwnode(pdata->irqfwnode);
1229     netif_dbg(dev, ifdown, dev->net, "free pdata\n");
1230     kfree(pdata);
1231 }
1232 
1233 static int smsc95xx_start_phy(struct usbnet *dev)
1234 {
1235     phy_start(dev->net->phydev);
1236 
1237     return 0;
1238 }
1239 
1240 static int smsc95xx_stop(struct usbnet *dev)
1241 {
1242     phy_stop(dev->net->phydev);
1243 
1244     return 0;
1245 }
1246 
1247 static u32 smsc_crc(const u8 *buffer, size_t len, int filter)
1248 {
1249     u32 crc = bitrev16(crc16(0xFFFF, buffer, len));
1250     return crc << ((filter % 2) * 16);
1251 }
1252 
1253 static int smsc95xx_link_ok(struct usbnet *dev)
1254 {
1255     struct smsc95xx_priv *pdata = dev->driver_priv;
1256     int ret;
1257 
1258     /* first, a dummy read, needed to latch some MII phys */
1259     ret = smsc95xx_mdio_read(dev, pdata->phydev->mdio.addr, MII_BMSR);
1260     if (ret < 0)
1261         return ret;
1262 
1263     ret = smsc95xx_mdio_read(dev, pdata->phydev->mdio.addr, MII_BMSR);
1264     if (ret < 0)
1265         return ret;
1266 
1267     return !!(ret & BMSR_LSTATUS);
1268 }
1269 
1270 static int smsc95xx_enter_suspend0(struct usbnet *dev)
1271 {
1272     struct smsc95xx_priv *pdata = dev->driver_priv;
1273     u32 val;
1274     int ret;
1275 
1276     ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1277     if (ret < 0)
1278         return ret;
1279 
1280     val &= (~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_));
1281     val |= PM_CTL_SUS_MODE_0;
1282 
1283     ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1284     if (ret < 0)
1285         return ret;
1286 
1287     /* clear wol status */
1288     val &= ~PM_CTL_WUPS_;
1289     val |= PM_CTL_WUPS_WOL_;
1290 
1291     /* enable energy detection */
1292     if (pdata->wolopts & WAKE_PHY)
1293         val |= PM_CTL_WUPS_ED_;
1294 
1295     ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1296     if (ret < 0)
1297         return ret;
1298 
1299     /* read back PM_CTRL */
1300     ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1301     if (ret < 0)
1302         return ret;
1303 
1304     pdata->suspend_flags |= SUSPEND_SUSPEND0;
1305 
1306     return 0;
1307 }
1308 
1309 static int smsc95xx_enter_suspend1(struct usbnet *dev)
1310 {
1311     struct smsc95xx_priv *pdata = dev->driver_priv;
1312     int ret, phy_id = pdata->phydev->mdio.addr;
1313     u32 val;
1314 
1315     /* reconfigure link pulse detection timing for
1316      * compatibility with non-standard link partners
1317      */
1318     if (pdata->features & FEATURE_PHY_NLP_CROSSOVER)
1319         smsc95xx_mdio_write(dev, phy_id, PHY_EDPD_CONFIG,
1320                     PHY_EDPD_CONFIG_DEFAULT);
1321 
1322     /* enable energy detect power-down mode */
1323     ret = smsc95xx_mdio_read(dev, phy_id, PHY_MODE_CTRL_STS);
1324     if (ret < 0)
1325         return ret;
1326 
1327     ret |= MODE_CTRL_STS_EDPWRDOWN_;
1328 
1329     smsc95xx_mdio_write(dev, phy_id, PHY_MODE_CTRL_STS, ret);
1330 
1331     /* enter SUSPEND1 mode */
1332     ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1333     if (ret < 0)
1334         return ret;
1335 
1336     val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1337     val |= PM_CTL_SUS_MODE_1;
1338 
1339     ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1340     if (ret < 0)
1341         return ret;
1342 
1343     /* clear wol status, enable energy detection */
1344     val &= ~PM_CTL_WUPS_;
1345     val |= (PM_CTL_WUPS_ED_ | PM_CTL_ED_EN_);
1346 
1347     ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1348     if (ret < 0)
1349         return ret;
1350 
1351     pdata->suspend_flags |= SUSPEND_SUSPEND1;
1352 
1353     return 0;
1354 }
1355 
1356 static int smsc95xx_enter_suspend2(struct usbnet *dev)
1357 {
1358     struct smsc95xx_priv *pdata = dev->driver_priv;
1359     u32 val;
1360     int ret;
1361 
1362     ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1363     if (ret < 0)
1364         return ret;
1365 
1366     val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1367     val |= PM_CTL_SUS_MODE_2;
1368 
1369     ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1370     if (ret < 0)
1371         return ret;
1372 
1373     pdata->suspend_flags |= SUSPEND_SUSPEND2;
1374 
1375     return 0;
1376 }
1377 
1378 static int smsc95xx_enter_suspend3(struct usbnet *dev)
1379 {
1380     struct smsc95xx_priv *pdata = dev->driver_priv;
1381     u32 val;
1382     int ret;
1383 
1384     ret = smsc95xx_read_reg(dev, RX_FIFO_INF, &val);
1385     if (ret < 0)
1386         return ret;
1387 
1388     if (val & RX_FIFO_INF_USED_) {
1389         netdev_info(dev->net, "rx fifo not empty in autosuspend\n");
1390         return -EBUSY;
1391     }
1392 
1393     ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1394     if (ret < 0)
1395         return ret;
1396 
1397     val &= ~(PM_CTL_SUS_MODE_ | PM_CTL_WUPS_ | PM_CTL_PHY_RST_);
1398     val |= PM_CTL_SUS_MODE_3 | PM_CTL_RES_CLR_WKP_STS;
1399 
1400     ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1401     if (ret < 0)
1402         return ret;
1403 
1404     /* clear wol status */
1405     val &= ~PM_CTL_WUPS_;
1406     val |= PM_CTL_WUPS_WOL_;
1407 
1408     ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1409     if (ret < 0)
1410         return ret;
1411 
1412     pdata->suspend_flags |= SUSPEND_SUSPEND3;
1413 
1414     return 0;
1415 }
1416 
1417 static int smsc95xx_autosuspend(struct usbnet *dev, u32 link_up)
1418 {
1419     struct smsc95xx_priv *pdata = dev->driver_priv;
1420 
1421     if (!netif_running(dev->net)) {
1422         /* interface is ifconfig down so fully power down hw */
1423         netdev_dbg(dev->net, "autosuspend entering SUSPEND2\n");
1424         return smsc95xx_enter_suspend2(dev);
1425     }
1426 
1427     if (!link_up) {
1428         /* link is down so enter EDPD mode, but only if device can
1429          * reliably resume from it.  This check should be redundant
1430          * as current FEATURE_REMOTE_WAKEUP parts also support
1431          * FEATURE_PHY_NLP_CROSSOVER but it's included for clarity */
1432         if (!(pdata->features & FEATURE_PHY_NLP_CROSSOVER)) {
1433             netdev_warn(dev->net, "EDPD not supported\n");
1434             return -EBUSY;
1435         }
1436 
1437         netdev_dbg(dev->net, "autosuspend entering SUSPEND1\n");
1438         netdev_info(dev->net, "entering SUSPEND1 mode\n");
1439         return smsc95xx_enter_suspend1(dev);
1440     }
1441 
1442     netdev_dbg(dev->net, "autosuspend entering SUSPEND3\n");
1443     return smsc95xx_enter_suspend3(dev);
1444 }
1445 
1446 static int smsc95xx_suspend(struct usb_interface *intf, pm_message_t message)
1447 {
1448     struct usbnet *dev = usb_get_intfdata(intf);
1449     struct smsc95xx_priv *pdata = dev->driver_priv;
1450     u32 val, link_up;
1451     int ret;
1452 
1453     pdata->pm_task = current;
1454 
1455     ret = usbnet_suspend(intf, message);
1456     if (ret < 0) {
1457         netdev_warn(dev->net, "usbnet_suspend error\n");
1458         pdata->pm_task = NULL;
1459         return ret;
1460     }
1461 
1462     if (pdata->suspend_flags) {
1463         netdev_warn(dev->net, "error during last resume\n");
1464         pdata->suspend_flags = 0;
1465     }
1466 
1467     link_up = smsc95xx_link_ok(dev);
1468 
1469     if (message.event == PM_EVENT_AUTO_SUSPEND &&
1470         (pdata->features & FEATURE_REMOTE_WAKEUP)) {
1471         ret = smsc95xx_autosuspend(dev, link_up);
1472         goto done;
1473     }
1474 
1475     /* if we get this far we're not autosuspending */
1476     /* if no wol options set, or if link is down and we're not waking on
1477      * PHY activity, enter lowest power SUSPEND2 mode
1478      */
1479     if (!(pdata->wolopts & SUPPORTED_WAKE) ||
1480         !(link_up || (pdata->wolopts & WAKE_PHY))) {
1481         netdev_info(dev->net, "entering SUSPEND2 mode\n");
1482 
1483         /* disable energy detect (link up) & wake up events */
1484         ret = smsc95xx_read_reg(dev, WUCSR, &val);
1485         if (ret < 0)
1486             goto done;
1487 
1488         val &= ~(WUCSR_MPEN_ | WUCSR_WAKE_EN_);
1489 
1490         ret = smsc95xx_write_reg(dev, WUCSR, val);
1491         if (ret < 0)
1492             goto done;
1493 
1494         ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1495         if (ret < 0)
1496             goto done;
1497 
1498         val &= ~(PM_CTL_ED_EN_ | PM_CTL_WOL_EN_);
1499 
1500         ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1501         if (ret < 0)
1502             goto done;
1503 
1504         ret = smsc95xx_enter_suspend2(dev);
1505         goto done;
1506     }
1507 
1508     if (pdata->wolopts & WAKE_PHY) {
1509         /* if link is down then configure EDPD and enter SUSPEND1,
1510          * otherwise enter SUSPEND0 below
1511          */
1512         if (!link_up) {
1513             netdev_info(dev->net, "entering SUSPEND1 mode\n");
1514             ret = smsc95xx_enter_suspend1(dev);
1515             goto done;
1516         }
1517     }
1518 
1519     if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
1520         u32 *filter_mask = kcalloc(32, sizeof(u32), GFP_KERNEL);
1521         u32 command[2];
1522         u32 offset[2];
1523         u32 crc[4];
1524         int wuff_filter_count =
1525             (pdata->features & FEATURE_8_WAKEUP_FILTERS) ?
1526             LAN9500A_WUFF_NUM : LAN9500_WUFF_NUM;
1527         int i, filter = 0;
1528 
1529         if (!filter_mask) {
1530             netdev_warn(dev->net, "Unable to allocate filter_mask\n");
1531             ret = -ENOMEM;
1532             goto done;
1533         }
1534 
1535         memset(command, 0, sizeof(command));
1536         memset(offset, 0, sizeof(offset));
1537         memset(crc, 0, sizeof(crc));
1538 
1539         if (pdata->wolopts & WAKE_BCAST) {
1540             const u8 bcast[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
1541             netdev_info(dev->net, "enabling broadcast detection\n");
1542             filter_mask[filter * 4] = 0x003F;
1543             filter_mask[filter * 4 + 1] = 0x00;
1544             filter_mask[filter * 4 + 2] = 0x00;
1545             filter_mask[filter * 4 + 3] = 0x00;
1546             command[filter/4] |= 0x05UL << ((filter % 4) * 8);
1547             offset[filter/4] |= 0x00 << ((filter % 4) * 8);
1548             crc[filter/2] |= smsc_crc(bcast, 6, filter);
1549             filter++;
1550         }
1551 
1552         if (pdata->wolopts & WAKE_MCAST) {
1553             const u8 mcast[] = {0x01, 0x00, 0x5E};
1554             netdev_info(dev->net, "enabling multicast detection\n");
1555             filter_mask[filter * 4] = 0x0007;
1556             filter_mask[filter * 4 + 1] = 0x00;
1557             filter_mask[filter * 4 + 2] = 0x00;
1558             filter_mask[filter * 4 + 3] = 0x00;
1559             command[filter/4] |= 0x09UL << ((filter % 4) * 8);
1560             offset[filter/4] |= 0x00  << ((filter % 4) * 8);
1561             crc[filter/2] |= smsc_crc(mcast, 3, filter);
1562             filter++;
1563         }
1564 
1565         if (pdata->wolopts & WAKE_ARP) {
1566             const u8 arp[] = {0x08, 0x06};
1567             netdev_info(dev->net, "enabling ARP detection\n");
1568             filter_mask[filter * 4] = 0x0003;
1569             filter_mask[filter * 4 + 1] = 0x00;
1570             filter_mask[filter * 4 + 2] = 0x00;
1571             filter_mask[filter * 4 + 3] = 0x00;
1572             command[filter/4] |= 0x05UL << ((filter % 4) * 8);
1573             offset[filter/4] |= 0x0C << ((filter % 4) * 8);
1574             crc[filter/2] |= smsc_crc(arp, 2, filter);
1575             filter++;
1576         }
1577 
1578         if (pdata->wolopts & WAKE_UCAST) {
1579             netdev_info(dev->net, "enabling unicast detection\n");
1580             filter_mask[filter * 4] = 0x003F;
1581             filter_mask[filter * 4 + 1] = 0x00;
1582             filter_mask[filter * 4 + 2] = 0x00;
1583             filter_mask[filter * 4 + 3] = 0x00;
1584             command[filter/4] |= 0x01UL << ((filter % 4) * 8);
1585             offset[filter/4] |= 0x00 << ((filter % 4) * 8);
1586             crc[filter/2] |= smsc_crc(dev->net->dev_addr, ETH_ALEN, filter);
1587             filter++;
1588         }
1589 
1590         for (i = 0; i < (wuff_filter_count * 4); i++) {
1591             ret = smsc95xx_write_reg(dev, WUFF, filter_mask[i]);
1592             if (ret < 0) {
1593                 kfree(filter_mask);
1594                 goto done;
1595             }
1596         }
1597         kfree(filter_mask);
1598 
1599         for (i = 0; i < (wuff_filter_count / 4); i++) {
1600             ret = smsc95xx_write_reg(dev, WUFF, command[i]);
1601             if (ret < 0)
1602                 goto done;
1603         }
1604 
1605         for (i = 0; i < (wuff_filter_count / 4); i++) {
1606             ret = smsc95xx_write_reg(dev, WUFF, offset[i]);
1607             if (ret < 0)
1608                 goto done;
1609         }
1610 
1611         for (i = 0; i < (wuff_filter_count / 2); i++) {
1612             ret = smsc95xx_write_reg(dev, WUFF, crc[i]);
1613             if (ret < 0)
1614                 goto done;
1615         }
1616 
1617         /* clear any pending pattern match packet status */
1618         ret = smsc95xx_read_reg(dev, WUCSR, &val);
1619         if (ret < 0)
1620             goto done;
1621 
1622         val |= WUCSR_WUFR_;
1623 
1624         ret = smsc95xx_write_reg(dev, WUCSR, val);
1625         if (ret < 0)
1626             goto done;
1627     }
1628 
1629     if (pdata->wolopts & WAKE_MAGIC) {
1630         /* clear any pending magic packet status */
1631         ret = smsc95xx_read_reg(dev, WUCSR, &val);
1632         if (ret < 0)
1633             goto done;
1634 
1635         val |= WUCSR_MPR_;
1636 
1637         ret = smsc95xx_write_reg(dev, WUCSR, val);
1638         if (ret < 0)
1639             goto done;
1640     }
1641 
1642     /* enable/disable wakeup sources */
1643     ret = smsc95xx_read_reg(dev, WUCSR, &val);
1644     if (ret < 0)
1645         goto done;
1646 
1647     if (pdata->wolopts & (WAKE_BCAST | WAKE_MCAST | WAKE_ARP | WAKE_UCAST)) {
1648         netdev_info(dev->net, "enabling pattern match wakeup\n");
1649         val |= WUCSR_WAKE_EN_;
1650     } else {
1651         netdev_info(dev->net, "disabling pattern match wakeup\n");
1652         val &= ~WUCSR_WAKE_EN_;
1653     }
1654 
1655     if (pdata->wolopts & WAKE_MAGIC) {
1656         netdev_info(dev->net, "enabling magic packet wakeup\n");
1657         val |= WUCSR_MPEN_;
1658     } else {
1659         netdev_info(dev->net, "disabling magic packet wakeup\n");
1660         val &= ~WUCSR_MPEN_;
1661     }
1662 
1663     ret = smsc95xx_write_reg(dev, WUCSR, val);
1664     if (ret < 0)
1665         goto done;
1666 
1667     /* enable wol wakeup source */
1668     ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1669     if (ret < 0)
1670         goto done;
1671 
1672     val |= PM_CTL_WOL_EN_;
1673 
1674     /* phy energy detect wakeup source */
1675     if (pdata->wolopts & WAKE_PHY)
1676         val |= PM_CTL_ED_EN_;
1677 
1678     ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1679     if (ret < 0)
1680         goto done;
1681 
1682     /* enable receiver to enable frame reception */
1683     smsc95xx_start_rx_path(dev);
1684 
1685     /* some wol options are enabled, so enter SUSPEND0 */
1686     netdev_info(dev->net, "entering SUSPEND0 mode\n");
1687     ret = smsc95xx_enter_suspend0(dev);
1688 
1689 done:
1690     /*
1691      * TODO: resume() might need to handle the suspend failure
1692      * in system sleep
1693      */
1694     if (ret && PMSG_IS_AUTO(message))
1695         usbnet_resume(intf);
1696 
1697     pdata->pm_task = NULL;
1698     return ret;
1699 }
1700 
1701 static int smsc95xx_resume(struct usb_interface *intf)
1702 {
1703     struct usbnet *dev = usb_get_intfdata(intf);
1704     struct smsc95xx_priv *pdata;
1705     u8 suspend_flags;
1706     int ret;
1707     u32 val;
1708 
1709     BUG_ON(!dev);
1710     pdata = dev->driver_priv;
1711     suspend_flags = pdata->suspend_flags;
1712 
1713     netdev_dbg(dev->net, "resume suspend_flags=0x%02x\n", suspend_flags);
1714 
1715     /* do this first to ensure it's cleared even in error case */
1716     pdata->suspend_flags = 0;
1717 
1718     pdata->pm_task = current;
1719 
1720     if (suspend_flags & SUSPEND_ALLMODES) {
1721         /* clear wake-up sources */
1722         ret = smsc95xx_read_reg(dev, WUCSR, &val);
1723         if (ret < 0)
1724             goto done;
1725 
1726         val &= ~(WUCSR_WAKE_EN_ | WUCSR_MPEN_);
1727 
1728         ret = smsc95xx_write_reg(dev, WUCSR, val);
1729         if (ret < 0)
1730             goto done;
1731 
1732         /* clear wake-up status */
1733         ret = smsc95xx_read_reg(dev, PM_CTRL, &val);
1734         if (ret < 0)
1735             goto done;
1736 
1737         val &= ~PM_CTL_WOL_EN_;
1738         val |= PM_CTL_WUPS_;
1739 
1740         ret = smsc95xx_write_reg(dev, PM_CTRL, val);
1741         if (ret < 0)
1742             goto done;
1743     }
1744 
1745     phy_init_hw(pdata->phydev);
1746 
1747     ret = usbnet_resume(intf);
1748     if (ret < 0)
1749         netdev_warn(dev->net, "usbnet_resume error\n");
1750 
1751 done:
1752     pdata->pm_task = NULL;
1753     return ret;
1754 }
1755 
1756 static int smsc95xx_reset_resume(struct usb_interface *intf)
1757 {
1758     struct usbnet *dev = usb_get_intfdata(intf);
1759     struct smsc95xx_priv *pdata = dev->driver_priv;
1760     int ret;
1761 
1762     pdata->pm_task = current;
1763     ret = smsc95xx_reset(dev);
1764     pdata->pm_task = NULL;
1765     if (ret < 0)
1766         return ret;
1767 
1768     return smsc95xx_resume(intf);
1769 }
1770 
1771 static void smsc95xx_rx_csum_offload(struct sk_buff *skb)
1772 {
1773     skb->csum = *(u16 *)(skb_tail_pointer(skb) - 2);
1774     skb->ip_summed = CHECKSUM_COMPLETE;
1775     skb_trim(skb, skb->len - 2);
1776 }
1777 
1778 static int smsc95xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
1779 {
1780     /* This check is no longer done by usbnet */
1781     if (skb->len < dev->net->hard_header_len)
1782         return 0;
1783 
1784     while (skb->len > 0) {
1785         u32 header, align_count;
1786         struct sk_buff *ax_skb;
1787         unsigned char *packet;
1788         u16 size;
1789 
1790         header = get_unaligned_le32(skb->data);
1791         skb_pull(skb, 4 + NET_IP_ALIGN);
1792         packet = skb->data;
1793 
1794         /* get the packet length */
1795         size = (u16)((header & RX_STS_FL_) >> 16);
1796         align_count = (4 - ((size + NET_IP_ALIGN) % 4)) % 4;
1797 
1798         if (unlikely(header & RX_STS_ES_)) {
1799             netif_dbg(dev, rx_err, dev->net,
1800                   "Error header=0x%08x\n", header);
1801             dev->net->stats.rx_errors++;
1802             dev->net->stats.rx_dropped++;
1803 
1804             if (header & RX_STS_CRC_) {
1805                 dev->net->stats.rx_crc_errors++;
1806             } else {
1807                 if (header & (RX_STS_TL_ | RX_STS_RF_))
1808                     dev->net->stats.rx_frame_errors++;
1809 
1810                 if ((header & RX_STS_LE_) &&
1811                     (!(header & RX_STS_FT_)))
1812                     dev->net->stats.rx_length_errors++;
1813             }
1814         } else {
1815             /* ETH_FRAME_LEN + 4(CRC) + 2(COE) + 4(Vlan) */
1816             if (unlikely(size > (ETH_FRAME_LEN + 12))) {
1817                 netif_dbg(dev, rx_err, dev->net,
1818                       "size err header=0x%08x\n", header);
1819                 return 0;
1820             }
1821 
1822             /* last frame in this batch */
1823             if (skb->len == size) {
1824                 if (dev->net->features & NETIF_F_RXCSUM)
1825                     smsc95xx_rx_csum_offload(skb);
1826                 skb_trim(skb, skb->len - 4); /* remove fcs */
1827                 skb->truesize = size + sizeof(struct sk_buff);
1828 
1829                 return 1;
1830             }
1831 
1832             ax_skb = skb_clone(skb, GFP_ATOMIC);
1833             if (unlikely(!ax_skb)) {
1834                 netdev_warn(dev->net, "Error allocating skb\n");
1835                 return 0;
1836             }
1837 
1838             ax_skb->len = size;
1839             ax_skb->data = packet;
1840             skb_set_tail_pointer(ax_skb, size);
1841 
1842             if (dev->net->features & NETIF_F_RXCSUM)
1843                 smsc95xx_rx_csum_offload(ax_skb);
1844             skb_trim(ax_skb, ax_skb->len - 4); /* remove fcs */
1845             ax_skb->truesize = size + sizeof(struct sk_buff);
1846 
1847             usbnet_skb_return(dev, ax_skb);
1848         }
1849 
1850         skb_pull(skb, size);
1851 
1852         /* padding bytes before the next frame starts */
1853         if (skb->len)
1854             skb_pull(skb, align_count);
1855     }
1856 
1857     return 1;
1858 }
1859 
1860 static u32 smsc95xx_calc_csum_preamble(struct sk_buff *skb)
1861 {
1862     u16 low_16 = (u16)skb_checksum_start_offset(skb);
1863     u16 high_16 = low_16 + skb->csum_offset;
1864     return (high_16 << 16) | low_16;
1865 }
1866 
1867 /* The TX CSUM won't work if the checksum lies in the last 4 bytes of the
1868  * transmission. This is fairly unlikely, only seems to trigger with some
1869  * short TCP ACK packets sent.
1870  *
1871  * Note, this calculation should probably check for the alignment of the
1872  * data as well, but a straight check for csum being in the last four bytes
1873  * of the packet should be ok for now.
1874  */
1875 static bool smsc95xx_can_tx_checksum(struct sk_buff *skb)
1876 {
1877        unsigned int len = skb->len - skb_checksum_start_offset(skb);
1878 
1879        if (skb->len <= 45)
1880            return false;
1881        return skb->csum_offset < (len - (4 + 1));
1882 }
1883 
1884 static struct sk_buff *smsc95xx_tx_fixup(struct usbnet *dev,
1885                      struct sk_buff *skb, gfp_t flags)
1886 {
1887     bool csum = skb->ip_summed == CHECKSUM_PARTIAL;
1888     int overhead = csum ? SMSC95XX_TX_OVERHEAD_CSUM : SMSC95XX_TX_OVERHEAD;
1889     u32 tx_cmd_a, tx_cmd_b;
1890     void *ptr;
1891 
1892     /* We do not advertise SG, so skbs should be already linearized */
1893     BUG_ON(skb_shinfo(skb)->nr_frags);
1894 
1895     /* Make writable and expand header space by overhead if required */
1896     if (skb_cow_head(skb, overhead)) {
1897         /* Must deallocate here as returning NULL to indicate error
1898          * means the skb won't be deallocated in the caller.
1899          */
1900         dev_kfree_skb_any(skb);
1901         return NULL;
1902     }
1903 
1904     tx_cmd_b = (u32)skb->len;
1905     tx_cmd_a = tx_cmd_b | TX_CMD_A_FIRST_SEG_ | TX_CMD_A_LAST_SEG_;
1906 
1907     if (csum) {
1908         if (!smsc95xx_can_tx_checksum(skb)) {
1909             /* workaround - hardware tx checksum does not work
1910              * properly with extremely small packets */
1911             long csstart = skb_checksum_start_offset(skb);
1912             __wsum calc = csum_partial(skb->data + csstart,
1913                 skb->len - csstart, 0);
1914             *((__sum16 *)(skb->data + csstart
1915                 + skb->csum_offset)) = csum_fold(calc);
1916 
1917             csum = false;
1918         } else {
1919             u32 csum_preamble = smsc95xx_calc_csum_preamble(skb);
1920             ptr = skb_push(skb, 4);
1921             put_unaligned_le32(csum_preamble, ptr);
1922 
1923             tx_cmd_a += 4;
1924             tx_cmd_b += 4;
1925             tx_cmd_b |= TX_CMD_B_CSUM_ENABLE;
1926         }
1927     }
1928 
1929     ptr = skb_push(skb, 8);
1930     put_unaligned_le32(tx_cmd_a, ptr);
1931     put_unaligned_le32(tx_cmd_b, ptr+4);
1932 
1933     return skb;
1934 }
1935 
1936 static int smsc95xx_manage_power(struct usbnet *dev, int on)
1937 {
1938     struct smsc95xx_priv *pdata = dev->driver_priv;
1939 
1940     dev->intf->needs_remote_wakeup = on;
1941 
1942     if (pdata->features & FEATURE_REMOTE_WAKEUP)
1943         return 0;
1944 
1945     /* this chip revision isn't capable of remote wakeup */
1946     netdev_info(dev->net, "hardware isn't capable of remote wakeup\n");
1947 
1948     if (on)
1949         usb_autopm_get_interface_no_resume(dev->intf);
1950     else
1951         usb_autopm_put_interface(dev->intf);
1952 
1953     return 0;
1954 }
1955 
1956 static const struct driver_info smsc95xx_info = {
1957     .description    = "smsc95xx USB 2.0 Ethernet",
1958     .bind       = smsc95xx_bind,
1959     .unbind     = smsc95xx_unbind,
1960     .reset      = smsc95xx_reset,
1961     .check_connect  = smsc95xx_start_phy,
1962     .stop       = smsc95xx_stop,
1963     .rx_fixup   = smsc95xx_rx_fixup,
1964     .tx_fixup   = smsc95xx_tx_fixup,
1965     .status     = smsc95xx_status,
1966     .manage_power   = smsc95xx_manage_power,
1967     .flags      = FLAG_ETHER | FLAG_SEND_ZLP | FLAG_LINK_INTR,
1968 };
1969 
1970 static const struct usb_device_id products[] = {
1971     {
1972         /* SMSC9500 USB Ethernet Device */
1973         USB_DEVICE(0x0424, 0x9500),
1974         .driver_info = (unsigned long) &smsc95xx_info,
1975     },
1976     {
1977         /* SMSC9505 USB Ethernet Device */
1978         USB_DEVICE(0x0424, 0x9505),
1979         .driver_info = (unsigned long) &smsc95xx_info,
1980     },
1981     {
1982         /* SMSC9500A USB Ethernet Device */
1983         USB_DEVICE(0x0424, 0x9E00),
1984         .driver_info = (unsigned long) &smsc95xx_info,
1985     },
1986     {
1987         /* SMSC9505A USB Ethernet Device */
1988         USB_DEVICE(0x0424, 0x9E01),
1989         .driver_info = (unsigned long) &smsc95xx_info,
1990     },
1991     {
1992         /* SMSC9512/9514 USB Hub & Ethernet Device */
1993         USB_DEVICE(0x0424, 0xec00),
1994         .driver_info = (unsigned long) &smsc95xx_info,
1995     },
1996     {
1997         /* SMSC9500 USB Ethernet Device (SAL10) */
1998         USB_DEVICE(0x0424, 0x9900),
1999         .driver_info = (unsigned long) &smsc95xx_info,
2000     },
2001     {
2002         /* SMSC9505 USB Ethernet Device (SAL10) */
2003         USB_DEVICE(0x0424, 0x9901),
2004         .driver_info = (unsigned long) &smsc95xx_info,
2005     },
2006     {
2007         /* SMSC9500A USB Ethernet Device (SAL10) */
2008         USB_DEVICE(0x0424, 0x9902),
2009         .driver_info = (unsigned long) &smsc95xx_info,
2010     },
2011     {
2012         /* SMSC9505A USB Ethernet Device (SAL10) */
2013         USB_DEVICE(0x0424, 0x9903),
2014         .driver_info = (unsigned long) &smsc95xx_info,
2015     },
2016     {
2017         /* SMSC9512/9514 USB Hub & Ethernet Device (SAL10) */
2018         USB_DEVICE(0x0424, 0x9904),
2019         .driver_info = (unsigned long) &smsc95xx_info,
2020     },
2021     {
2022         /* SMSC9500A USB Ethernet Device (HAL) */
2023         USB_DEVICE(0x0424, 0x9905),
2024         .driver_info = (unsigned long) &smsc95xx_info,
2025     },
2026     {
2027         /* SMSC9505A USB Ethernet Device (HAL) */
2028         USB_DEVICE(0x0424, 0x9906),
2029         .driver_info = (unsigned long) &smsc95xx_info,
2030     },
2031     {
2032         /* SMSC9500 USB Ethernet Device (Alternate ID) */
2033         USB_DEVICE(0x0424, 0x9907),
2034         .driver_info = (unsigned long) &smsc95xx_info,
2035     },
2036     {
2037         /* SMSC9500A USB Ethernet Device (Alternate ID) */
2038         USB_DEVICE(0x0424, 0x9908),
2039         .driver_info = (unsigned long) &smsc95xx_info,
2040     },
2041     {
2042         /* SMSC9512/9514 USB Hub & Ethernet Device (Alternate ID) */
2043         USB_DEVICE(0x0424, 0x9909),
2044         .driver_info = (unsigned long) &smsc95xx_info,
2045     },
2046     {
2047         /* SMSC LAN9530 USB Ethernet Device */
2048         USB_DEVICE(0x0424, 0x9530),
2049         .driver_info = (unsigned long) &smsc95xx_info,
2050     },
2051     {
2052         /* SMSC LAN9730 USB Ethernet Device */
2053         USB_DEVICE(0x0424, 0x9730),
2054         .driver_info = (unsigned long) &smsc95xx_info,
2055     },
2056     {
2057         /* SMSC LAN89530 USB Ethernet Device */
2058         USB_DEVICE(0x0424, 0x9E08),
2059         .driver_info = (unsigned long) &smsc95xx_info,
2060     },
2061     {
2062         /* Microchip's EVB-LAN8670-USB 10BASE-T1S Ethernet Device */
2063         USB_DEVICE(0x184F, 0x0051),
2064         .driver_info = (unsigned long)&smsc95xx_info,
2065     },
2066     { },        /* END */
2067 };
2068 MODULE_DEVICE_TABLE(usb, products);
2069 
2070 static struct usb_driver smsc95xx_driver = {
2071     .name       = "smsc95xx",
2072     .id_table   = products,
2073     .probe      = usbnet_probe,
2074     .suspend    = smsc95xx_suspend,
2075     .resume     = smsc95xx_resume,
2076     .reset_resume   = smsc95xx_reset_resume,
2077     .disconnect = usbnet_disconnect,
2078     .disable_hub_initiated_lpm = 1,
2079     .supports_autosuspend = 1,
2080 };
2081 
2082 module_usb_driver(smsc95xx_driver);
2083 
2084 MODULE_AUTHOR("Nancy Lin");
2085 MODULE_AUTHOR("Steve Glendinning <steve.glendinning@shawell.net>");
2086 MODULE_DESCRIPTION("SMSC95XX USB 2.0 Ethernet Devices");
2087 MODULE_LICENSE("GPL");
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