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0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002  /***************************************************************************
0003  *
0004  * Copyright (C) 2007-2010 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 "smsc75xx.h"
0022 
0023 #define SMSC_CHIPNAME           "smsc75xx"
0024 #define SMSC_DRIVER_VERSION     "1.0.0"
0025 #define HS_USB_PKT_SIZE         (512)
0026 #define FS_USB_PKT_SIZE         (64)
0027 #define DEFAULT_HS_BURST_CAP_SIZE   (16 * 1024 + 5 * HS_USB_PKT_SIZE)
0028 #define DEFAULT_FS_BURST_CAP_SIZE   (6 * 1024 + 33 * FS_USB_PKT_SIZE)
0029 #define DEFAULT_BULK_IN_DELAY       (0x00002000)
0030 #define MAX_SINGLE_PACKET_SIZE      (9000)
0031 #define LAN75XX_EEPROM_MAGIC        (0x7500)
0032 #define EEPROM_MAC_OFFSET       (0x01)
0033 #define DEFAULT_TX_CSUM_ENABLE      (true)
0034 #define DEFAULT_RX_CSUM_ENABLE      (true)
0035 #define SMSC75XX_INTERNAL_PHY_ID    (1)
0036 #define SMSC75XX_TX_OVERHEAD        (8)
0037 #define MAX_RX_FIFO_SIZE        (20 * 1024)
0038 #define MAX_TX_FIFO_SIZE        (12 * 1024)
0039 #define USB_VENDOR_ID_SMSC      (0x0424)
0040 #define USB_PRODUCT_ID_LAN7500      (0x7500)
0041 #define USB_PRODUCT_ID_LAN7505      (0x7505)
0042 #define RXW_PADDING         2
0043 #define SUPPORTED_WAKE          (WAKE_PHY | WAKE_UCAST | WAKE_BCAST | \
0044                      WAKE_MCAST | WAKE_ARP | WAKE_MAGIC)
0045 
0046 #define SUSPEND_SUSPEND0        (0x01)
0047 #define SUSPEND_SUSPEND1        (0x02)
0048 #define SUSPEND_SUSPEND2        (0x04)
0049 #define SUSPEND_SUSPEND3        (0x08)
0050 #define SUSPEND_ALLMODES        (SUSPEND_SUSPEND0 | SUSPEND_SUSPEND1 | \
0051                      SUSPEND_SUSPEND2 | SUSPEND_SUSPEND3)
0052 
0053 struct smsc75xx_priv {
0054     struct usbnet *dev;
0055     u32 rfe_ctl;
0056     u32 wolopts;
0057     u32 multicast_hash_table[DP_SEL_VHF_HASH_LEN];
0058     struct mutex dataport_mutex;
0059     spinlock_t rfe_ctl_lock;
0060     struct work_struct set_multicast;
0061     u8 suspend_flags;
0062 };
0063 
0064 struct usb_context {
0065     struct usb_ctrlrequest req;
0066     struct usbnet *dev;
0067 };
0068 
0069 static bool turbo_mode = true;
0070 module_param(turbo_mode, bool, 0644);
0071 MODULE_PARM_DESC(turbo_mode, "Enable multiple frames per Rx transaction");
0072 
0073 static int smsc75xx_link_ok_nopm(struct usbnet *dev);
0074 static int smsc75xx_phy_gig_workaround(struct usbnet *dev);
0075 
0076 static int __must_check __smsc75xx_read_reg(struct usbnet *dev, u32 index,
0077                         u32 *data, int in_pm)
0078 {
0079     u32 buf;
0080     int ret;
0081     int (*fn)(struct usbnet *, u8, u8, u16, u16, void *, u16);
0082 
0083     BUG_ON(!dev);
0084 
0085     if (!in_pm)
0086         fn = usbnet_read_cmd;
0087     else
0088         fn = usbnet_read_cmd_nopm;
0089 
0090     ret = fn(dev, USB_VENDOR_REQUEST_READ_REGISTER, USB_DIR_IN
0091          | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
0092          0, index, &buf, 4);
0093     if (unlikely(ret < 0)) {
0094         netdev_warn(dev->net, "Failed to read reg index 0x%08x: %d\n",
0095                 index, ret);
0096         return ret;
0097     }
0098 
0099     le32_to_cpus(&buf);
0100     *data = buf;
0101 
0102     return ret;
0103 }
0104 
0105 static int __must_check __smsc75xx_write_reg(struct usbnet *dev, u32 index,
0106                          u32 data, int in_pm)
0107 {
0108     u32 buf;
0109     int ret;
0110     int (*fn)(struct usbnet *, u8, u8, u16, u16, const void *, u16);
0111 
0112     BUG_ON(!dev);
0113 
0114     if (!in_pm)
0115         fn = usbnet_write_cmd;
0116     else
0117         fn = usbnet_write_cmd_nopm;
0118 
0119     buf = data;
0120     cpu_to_le32s(&buf);
0121 
0122     ret = fn(dev, USB_VENDOR_REQUEST_WRITE_REGISTER, USB_DIR_OUT
0123          | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
0124          0, index, &buf, 4);
0125     if (unlikely(ret < 0))
0126         netdev_warn(dev->net, "Failed to write reg index 0x%08x: %d\n",
0127                 index, ret);
0128 
0129     return ret;
0130 }
0131 
0132 static int __must_check smsc75xx_read_reg_nopm(struct usbnet *dev, u32 index,
0133                            u32 *data)
0134 {
0135     return __smsc75xx_read_reg(dev, index, data, 1);
0136 }
0137 
0138 static int __must_check smsc75xx_write_reg_nopm(struct usbnet *dev, u32 index,
0139                         u32 data)
0140 {
0141     return __smsc75xx_write_reg(dev, index, data, 1);
0142 }
0143 
0144 static int __must_check smsc75xx_read_reg(struct usbnet *dev, u32 index,
0145                       u32 *data)
0146 {
0147     return __smsc75xx_read_reg(dev, index, data, 0);
0148 }
0149 
0150 static int __must_check smsc75xx_write_reg(struct usbnet *dev, u32 index,
0151                        u32 data)
0152 {
0153     return __smsc75xx_write_reg(dev, index, data, 0);
0154 }
0155 
0156 /* Loop until the read is completed with timeout
0157  * called with phy_mutex held */
0158 static __must_check int __smsc75xx_phy_wait_not_busy(struct usbnet *dev,
0159                              int in_pm)
0160 {
0161     unsigned long start_time = jiffies;
0162     u32 val;
0163     int ret;
0164 
0165     do {
0166         ret = __smsc75xx_read_reg(dev, MII_ACCESS, &val, in_pm);
0167         if (ret < 0) {
0168             netdev_warn(dev->net, "Error reading MII_ACCESS\n");
0169             return ret;
0170         }
0171 
0172         if (!(val & MII_ACCESS_BUSY))
0173             return 0;
0174     } while (!time_after(jiffies, start_time + HZ));
0175 
0176     return -EIO;
0177 }
0178 
0179 static int __smsc75xx_mdio_read(struct net_device *netdev, int phy_id, int idx,
0180                 int in_pm)
0181 {
0182     struct usbnet *dev = netdev_priv(netdev);
0183     u32 val, addr;
0184     int ret;
0185 
0186     mutex_lock(&dev->phy_mutex);
0187 
0188     /* confirm MII not busy */
0189     ret = __smsc75xx_phy_wait_not_busy(dev, in_pm);
0190     if (ret < 0) {
0191         netdev_warn(dev->net, "MII is busy in smsc75xx_mdio_read\n");
0192         goto done;
0193     }
0194 
0195     /* set the address, index & direction (read from PHY) */
0196     phy_id &= dev->mii.phy_id_mask;
0197     idx &= dev->mii.reg_num_mask;
0198     addr = ((phy_id << MII_ACCESS_PHY_ADDR_SHIFT) & MII_ACCESS_PHY_ADDR)
0199         | ((idx << MII_ACCESS_REG_ADDR_SHIFT) & MII_ACCESS_REG_ADDR)
0200         | MII_ACCESS_READ | MII_ACCESS_BUSY;
0201     ret = __smsc75xx_write_reg(dev, MII_ACCESS, addr, in_pm);
0202     if (ret < 0) {
0203         netdev_warn(dev->net, "Error writing MII_ACCESS\n");
0204         goto done;
0205     }
0206 
0207     ret = __smsc75xx_phy_wait_not_busy(dev, in_pm);
0208     if (ret < 0) {
0209         netdev_warn(dev->net, "Timed out reading MII reg %02X\n", idx);
0210         goto done;
0211     }
0212 
0213     ret = __smsc75xx_read_reg(dev, MII_DATA, &val, in_pm);
0214     if (ret < 0) {
0215         netdev_warn(dev->net, "Error reading MII_DATA\n");
0216         goto done;
0217     }
0218 
0219     ret = (u16)(val & 0xFFFF);
0220 
0221 done:
0222     mutex_unlock(&dev->phy_mutex);
0223     return ret;
0224 }
0225 
0226 static void __smsc75xx_mdio_write(struct net_device *netdev, int phy_id,
0227                   int idx, int regval, int in_pm)
0228 {
0229     struct usbnet *dev = netdev_priv(netdev);
0230     u32 val, addr;
0231     int ret;
0232 
0233     mutex_lock(&dev->phy_mutex);
0234 
0235     /* confirm MII not busy */
0236     ret = __smsc75xx_phy_wait_not_busy(dev, in_pm);
0237     if (ret < 0) {
0238         netdev_warn(dev->net, "MII is busy in smsc75xx_mdio_write\n");
0239         goto done;
0240     }
0241 
0242     val = regval;
0243     ret = __smsc75xx_write_reg(dev, MII_DATA, val, in_pm);
0244     if (ret < 0) {
0245         netdev_warn(dev->net, "Error writing MII_DATA\n");
0246         goto done;
0247     }
0248 
0249     /* set the address, index & direction (write to PHY) */
0250     phy_id &= dev->mii.phy_id_mask;
0251     idx &= dev->mii.reg_num_mask;
0252     addr = ((phy_id << MII_ACCESS_PHY_ADDR_SHIFT) & MII_ACCESS_PHY_ADDR)
0253         | ((idx << MII_ACCESS_REG_ADDR_SHIFT) & MII_ACCESS_REG_ADDR)
0254         | MII_ACCESS_WRITE | MII_ACCESS_BUSY;
0255     ret = __smsc75xx_write_reg(dev, MII_ACCESS, addr, in_pm);
0256     if (ret < 0) {
0257         netdev_warn(dev->net, "Error writing MII_ACCESS\n");
0258         goto done;
0259     }
0260 
0261     ret = __smsc75xx_phy_wait_not_busy(dev, in_pm);
0262     if (ret < 0) {
0263         netdev_warn(dev->net, "Timed out writing MII reg %02X\n", idx);
0264         goto done;
0265     }
0266 
0267 done:
0268     mutex_unlock(&dev->phy_mutex);
0269 }
0270 
0271 static int smsc75xx_mdio_read_nopm(struct net_device *netdev, int phy_id,
0272                    int idx)
0273 {
0274     return __smsc75xx_mdio_read(netdev, phy_id, idx, 1);
0275 }
0276 
0277 static void smsc75xx_mdio_write_nopm(struct net_device *netdev, int phy_id,
0278                      int idx, int regval)
0279 {
0280     __smsc75xx_mdio_write(netdev, phy_id, idx, regval, 1);
0281 }
0282 
0283 static int smsc75xx_mdio_read(struct net_device *netdev, int phy_id, int idx)
0284 {
0285     return __smsc75xx_mdio_read(netdev, phy_id, idx, 0);
0286 }
0287 
0288 static void smsc75xx_mdio_write(struct net_device *netdev, int phy_id, int idx,
0289                 int regval)
0290 {
0291     __smsc75xx_mdio_write(netdev, phy_id, idx, regval, 0);
0292 }
0293 
0294 static int smsc75xx_wait_eeprom(struct usbnet *dev)
0295 {
0296     unsigned long start_time = jiffies;
0297     u32 val;
0298     int ret;
0299 
0300     do {
0301         ret = smsc75xx_read_reg(dev, E2P_CMD, &val);
0302         if (ret < 0) {
0303             netdev_warn(dev->net, "Error reading E2P_CMD\n");
0304             return ret;
0305         }
0306 
0307         if (!(val & E2P_CMD_BUSY) || (val & E2P_CMD_TIMEOUT))
0308             break;
0309         udelay(40);
0310     } while (!time_after(jiffies, start_time + HZ));
0311 
0312     if (val & (E2P_CMD_TIMEOUT | E2P_CMD_BUSY)) {
0313         netdev_warn(dev->net, "EEPROM read operation timeout\n");
0314         return -EIO;
0315     }
0316 
0317     return 0;
0318 }
0319 
0320 static int smsc75xx_eeprom_confirm_not_busy(struct usbnet *dev)
0321 {
0322     unsigned long start_time = jiffies;
0323     u32 val;
0324     int ret;
0325 
0326     do {
0327         ret = smsc75xx_read_reg(dev, E2P_CMD, &val);
0328         if (ret < 0) {
0329             netdev_warn(dev->net, "Error reading E2P_CMD\n");
0330             return ret;
0331         }
0332 
0333         if (!(val & E2P_CMD_BUSY))
0334             return 0;
0335 
0336         udelay(40);
0337     } while (!time_after(jiffies, start_time + HZ));
0338 
0339     netdev_warn(dev->net, "EEPROM is busy\n");
0340     return -EIO;
0341 }
0342 
0343 static int smsc75xx_read_eeprom(struct usbnet *dev, u32 offset, u32 length,
0344                 u8 *data)
0345 {
0346     u32 val;
0347     int i, ret;
0348 
0349     BUG_ON(!dev);
0350     BUG_ON(!data);
0351 
0352     ret = smsc75xx_eeprom_confirm_not_busy(dev);
0353     if (ret)
0354         return ret;
0355 
0356     for (i = 0; i < length; i++) {
0357         val = E2P_CMD_BUSY | E2P_CMD_READ | (offset & E2P_CMD_ADDR);
0358         ret = smsc75xx_write_reg(dev, E2P_CMD, val);
0359         if (ret < 0) {
0360             netdev_warn(dev->net, "Error writing E2P_CMD\n");
0361             return ret;
0362         }
0363 
0364         ret = smsc75xx_wait_eeprom(dev);
0365         if (ret < 0)
0366             return ret;
0367 
0368         ret = smsc75xx_read_reg(dev, E2P_DATA, &val);
0369         if (ret < 0) {
0370             netdev_warn(dev->net, "Error reading E2P_DATA\n");
0371             return ret;
0372         }
0373 
0374         data[i] = val & 0xFF;
0375         offset++;
0376     }
0377 
0378     return 0;
0379 }
0380 
0381 static int smsc75xx_write_eeprom(struct usbnet *dev, u32 offset, u32 length,
0382                  u8 *data)
0383 {
0384     u32 val;
0385     int i, ret;
0386 
0387     BUG_ON(!dev);
0388     BUG_ON(!data);
0389 
0390     ret = smsc75xx_eeprom_confirm_not_busy(dev);
0391     if (ret)
0392         return ret;
0393 
0394     /* Issue write/erase enable command */
0395     val = E2P_CMD_BUSY | E2P_CMD_EWEN;
0396     ret = smsc75xx_write_reg(dev, E2P_CMD, val);
0397     if (ret < 0) {
0398         netdev_warn(dev->net, "Error writing E2P_CMD\n");
0399         return ret;
0400     }
0401 
0402     ret = smsc75xx_wait_eeprom(dev);
0403     if (ret < 0)
0404         return ret;
0405 
0406     for (i = 0; i < length; i++) {
0407 
0408         /* Fill data register */
0409         val = data[i];
0410         ret = smsc75xx_write_reg(dev, E2P_DATA, val);
0411         if (ret < 0) {
0412             netdev_warn(dev->net, "Error writing E2P_DATA\n");
0413             return ret;
0414         }
0415 
0416         /* Send "write" command */
0417         val = E2P_CMD_BUSY | E2P_CMD_WRITE | (offset & E2P_CMD_ADDR);
0418         ret = smsc75xx_write_reg(dev, E2P_CMD, val);
0419         if (ret < 0) {
0420             netdev_warn(dev->net, "Error writing E2P_CMD\n");
0421             return ret;
0422         }
0423 
0424         ret = smsc75xx_wait_eeprom(dev);
0425         if (ret < 0)
0426             return ret;
0427 
0428         offset++;
0429     }
0430 
0431     return 0;
0432 }
0433 
0434 static int smsc75xx_dataport_wait_not_busy(struct usbnet *dev)
0435 {
0436     int i, ret;
0437 
0438     for (i = 0; i < 100; i++) {
0439         u32 dp_sel;
0440         ret = smsc75xx_read_reg(dev, DP_SEL, &dp_sel);
0441         if (ret < 0) {
0442             netdev_warn(dev->net, "Error reading DP_SEL\n");
0443             return ret;
0444         }
0445 
0446         if (dp_sel & DP_SEL_DPRDY)
0447             return 0;
0448 
0449         udelay(40);
0450     }
0451 
0452     netdev_warn(dev->net, "smsc75xx_dataport_wait_not_busy timed out\n");
0453 
0454     return -EIO;
0455 }
0456 
0457 static int smsc75xx_dataport_write(struct usbnet *dev, u32 ram_select, u32 addr,
0458                    u32 length, u32 *buf)
0459 {
0460     struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);
0461     u32 dp_sel;
0462     int i, ret;
0463 
0464     mutex_lock(&pdata->dataport_mutex);
0465 
0466     ret = smsc75xx_dataport_wait_not_busy(dev);
0467     if (ret < 0) {
0468         netdev_warn(dev->net, "smsc75xx_dataport_write busy on entry\n");
0469         goto done;
0470     }
0471 
0472     ret = smsc75xx_read_reg(dev, DP_SEL, &dp_sel);
0473     if (ret < 0) {
0474         netdev_warn(dev->net, "Error reading DP_SEL\n");
0475         goto done;
0476     }
0477 
0478     dp_sel &= ~DP_SEL_RSEL;
0479     dp_sel |= ram_select;
0480     ret = smsc75xx_write_reg(dev, DP_SEL, dp_sel);
0481     if (ret < 0) {
0482         netdev_warn(dev->net, "Error writing DP_SEL\n");
0483         goto done;
0484     }
0485 
0486     for (i = 0; i < length; i++) {
0487         ret = smsc75xx_write_reg(dev, DP_ADDR, addr + i);
0488         if (ret < 0) {
0489             netdev_warn(dev->net, "Error writing DP_ADDR\n");
0490             goto done;
0491         }
0492 
0493         ret = smsc75xx_write_reg(dev, DP_DATA, buf[i]);
0494         if (ret < 0) {
0495             netdev_warn(dev->net, "Error writing DP_DATA\n");
0496             goto done;
0497         }
0498 
0499         ret = smsc75xx_write_reg(dev, DP_CMD, DP_CMD_WRITE);
0500         if (ret < 0) {
0501             netdev_warn(dev->net, "Error writing DP_CMD\n");
0502             goto done;
0503         }
0504 
0505         ret = smsc75xx_dataport_wait_not_busy(dev);
0506         if (ret < 0) {
0507             netdev_warn(dev->net, "smsc75xx_dataport_write timeout\n");
0508             goto done;
0509         }
0510     }
0511 
0512 done:
0513     mutex_unlock(&pdata->dataport_mutex);
0514     return ret;
0515 }
0516 
0517 /* returns hash bit number for given MAC address */
0518 static u32 smsc75xx_hash(char addr[ETH_ALEN])
0519 {
0520     return (ether_crc(ETH_ALEN, addr) >> 23) & 0x1ff;
0521 }
0522 
0523 static void smsc75xx_deferred_multicast_write(struct work_struct *param)
0524 {
0525     struct smsc75xx_priv *pdata =
0526         container_of(param, struct smsc75xx_priv, set_multicast);
0527     struct usbnet *dev = pdata->dev;
0528     int ret;
0529 
0530     netif_dbg(dev, drv, dev->net, "deferred multicast write 0x%08x\n",
0531           pdata->rfe_ctl);
0532 
0533     smsc75xx_dataport_write(dev, DP_SEL_VHF, DP_SEL_VHF_VLAN_LEN,
0534         DP_SEL_VHF_HASH_LEN, pdata->multicast_hash_table);
0535 
0536     ret = smsc75xx_write_reg(dev, RFE_CTL, pdata->rfe_ctl);
0537     if (ret < 0)
0538         netdev_warn(dev->net, "Error writing RFE_CRL\n");
0539 }
0540 
0541 static void smsc75xx_set_multicast(struct net_device *netdev)
0542 {
0543     struct usbnet *dev = netdev_priv(netdev);
0544     struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);
0545     unsigned long flags;
0546     int i;
0547 
0548     spin_lock_irqsave(&pdata->rfe_ctl_lock, flags);
0549 
0550     pdata->rfe_ctl &=
0551         ~(RFE_CTL_AU | RFE_CTL_AM | RFE_CTL_DPF | RFE_CTL_MHF);
0552     pdata->rfe_ctl |= RFE_CTL_AB;
0553 
0554     for (i = 0; i < DP_SEL_VHF_HASH_LEN; i++)
0555         pdata->multicast_hash_table[i] = 0;
0556 
0557     if (dev->net->flags & IFF_PROMISC) {
0558         netif_dbg(dev, drv, dev->net, "promiscuous mode enabled\n");
0559         pdata->rfe_ctl |= RFE_CTL_AM | RFE_CTL_AU;
0560     } else if (dev->net->flags & IFF_ALLMULTI) {
0561         netif_dbg(dev, drv, dev->net, "receive all multicast enabled\n");
0562         pdata->rfe_ctl |= RFE_CTL_AM | RFE_CTL_DPF;
0563     } else if (!netdev_mc_empty(dev->net)) {
0564         struct netdev_hw_addr *ha;
0565 
0566         netif_dbg(dev, drv, dev->net, "receive multicast hash filter\n");
0567 
0568         pdata->rfe_ctl |= RFE_CTL_MHF | RFE_CTL_DPF;
0569 
0570         netdev_for_each_mc_addr(ha, netdev) {
0571             u32 bitnum = smsc75xx_hash(ha->addr);
0572             pdata->multicast_hash_table[bitnum / 32] |=
0573                 (1 << (bitnum % 32));
0574         }
0575     } else {
0576         netif_dbg(dev, drv, dev->net, "receive own packets only\n");
0577         pdata->rfe_ctl |= RFE_CTL_DPF;
0578     }
0579 
0580     spin_unlock_irqrestore(&pdata->rfe_ctl_lock, flags);
0581 
0582     /* defer register writes to a sleepable context */
0583     schedule_work(&pdata->set_multicast);
0584 }
0585 
0586 static int smsc75xx_update_flowcontrol(struct usbnet *dev, u8 duplex,
0587                         u16 lcladv, u16 rmtadv)
0588 {
0589     u32 flow = 0, fct_flow = 0;
0590     int ret;
0591 
0592     if (duplex == DUPLEX_FULL) {
0593         u8 cap = mii_resolve_flowctrl_fdx(lcladv, rmtadv);
0594 
0595         if (cap & FLOW_CTRL_TX) {
0596             flow = (FLOW_TX_FCEN | 0xFFFF);
0597             /* set fct_flow thresholds to 20% and 80% */
0598             fct_flow = (8 << 8) | 32;
0599         }
0600 
0601         if (cap & FLOW_CTRL_RX)
0602             flow |= FLOW_RX_FCEN;
0603 
0604         netif_dbg(dev, link, dev->net, "rx pause %s, tx pause %s\n",
0605               (cap & FLOW_CTRL_RX ? "enabled" : "disabled"),
0606               (cap & FLOW_CTRL_TX ? "enabled" : "disabled"));
0607     } else {
0608         netif_dbg(dev, link, dev->net, "half duplex\n");
0609     }
0610 
0611     ret = smsc75xx_write_reg(dev, FLOW, flow);
0612     if (ret < 0) {
0613         netdev_warn(dev->net, "Error writing FLOW\n");
0614         return ret;
0615     }
0616 
0617     ret = smsc75xx_write_reg(dev, FCT_FLOW, fct_flow);
0618     if (ret < 0) {
0619         netdev_warn(dev->net, "Error writing FCT_FLOW\n");
0620         return ret;
0621     }
0622 
0623     return 0;
0624 }
0625 
0626 static int smsc75xx_link_reset(struct usbnet *dev)
0627 {
0628     struct mii_if_info *mii = &dev->mii;
0629     struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET };
0630     u16 lcladv, rmtadv;
0631     int ret;
0632 
0633     /* write to clear phy interrupt status */
0634     smsc75xx_mdio_write(dev->net, mii->phy_id, PHY_INT_SRC,
0635         PHY_INT_SRC_CLEAR_ALL);
0636 
0637     ret = smsc75xx_write_reg(dev, INT_STS, INT_STS_CLEAR_ALL);
0638     if (ret < 0) {
0639         netdev_warn(dev->net, "Error writing INT_STS\n");
0640         return ret;
0641     }
0642 
0643     mii_check_media(mii, 1, 1);
0644     mii_ethtool_gset(&dev->mii, &ecmd);
0645     lcladv = smsc75xx_mdio_read(dev->net, mii->phy_id, MII_ADVERTISE);
0646     rmtadv = smsc75xx_mdio_read(dev->net, mii->phy_id, MII_LPA);
0647 
0648     netif_dbg(dev, link, dev->net, "speed: %u duplex: %d lcladv: %04x rmtadv: %04x\n",
0649           ethtool_cmd_speed(&ecmd), ecmd.duplex, lcladv, rmtadv);
0650 
0651     return smsc75xx_update_flowcontrol(dev, ecmd.duplex, lcladv, rmtadv);
0652 }
0653 
0654 static void smsc75xx_status(struct usbnet *dev, struct urb *urb)
0655 {
0656     u32 intdata;
0657 
0658     if (urb->actual_length != 4) {
0659         netdev_warn(dev->net, "unexpected urb length %d\n",
0660                 urb->actual_length);
0661         return;
0662     }
0663 
0664     intdata = get_unaligned_le32(urb->transfer_buffer);
0665 
0666     netif_dbg(dev, link, dev->net, "intdata: 0x%08X\n", intdata);
0667 
0668     if (intdata & INT_ENP_PHY_INT)
0669         usbnet_defer_kevent(dev, EVENT_LINK_RESET);
0670     else
0671         netdev_warn(dev->net, "unexpected interrupt, intdata=0x%08X\n",
0672                 intdata);
0673 }
0674 
0675 static int smsc75xx_ethtool_get_eeprom_len(struct net_device *net)
0676 {
0677     return MAX_EEPROM_SIZE;
0678 }
0679 
0680 static int smsc75xx_ethtool_get_eeprom(struct net_device *netdev,
0681                        struct ethtool_eeprom *ee, u8 *data)
0682 {
0683     struct usbnet *dev = netdev_priv(netdev);
0684 
0685     ee->magic = LAN75XX_EEPROM_MAGIC;
0686 
0687     return smsc75xx_read_eeprom(dev, ee->offset, ee->len, data);
0688 }
0689 
0690 static int smsc75xx_ethtool_set_eeprom(struct net_device *netdev,
0691                        struct ethtool_eeprom *ee, u8 *data)
0692 {
0693     struct usbnet *dev = netdev_priv(netdev);
0694 
0695     if (ee->magic != LAN75XX_EEPROM_MAGIC) {
0696         netdev_warn(dev->net, "EEPROM: magic value mismatch: 0x%x\n",
0697                 ee->magic);
0698         return -EINVAL;
0699     }
0700 
0701     return smsc75xx_write_eeprom(dev, ee->offset, ee->len, data);
0702 }
0703 
0704 static void smsc75xx_ethtool_get_wol(struct net_device *net,
0705                      struct ethtool_wolinfo *wolinfo)
0706 {
0707     struct usbnet *dev = netdev_priv(net);
0708     struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);
0709 
0710     wolinfo->supported = SUPPORTED_WAKE;
0711     wolinfo->wolopts = pdata->wolopts;
0712 }
0713 
0714 static int smsc75xx_ethtool_set_wol(struct net_device *net,
0715                     struct ethtool_wolinfo *wolinfo)
0716 {
0717     struct usbnet *dev = netdev_priv(net);
0718     struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);
0719     int ret;
0720 
0721     if (wolinfo->wolopts & ~SUPPORTED_WAKE)
0722         return -EINVAL;
0723 
0724     pdata->wolopts = wolinfo->wolopts & SUPPORTED_WAKE;
0725 
0726     ret = device_set_wakeup_enable(&dev->udev->dev, pdata->wolopts);
0727     if (ret < 0)
0728         netdev_warn(dev->net, "device_set_wakeup_enable error %d\n", ret);
0729 
0730     return ret;
0731 }
0732 
0733 static const struct ethtool_ops smsc75xx_ethtool_ops = {
0734     .get_link   = usbnet_get_link,
0735     .nway_reset = usbnet_nway_reset,
0736     .get_drvinfo    = usbnet_get_drvinfo,
0737     .get_msglevel   = usbnet_get_msglevel,
0738     .set_msglevel   = usbnet_set_msglevel,
0739     .get_eeprom_len = smsc75xx_ethtool_get_eeprom_len,
0740     .get_eeprom = smsc75xx_ethtool_get_eeprom,
0741     .set_eeprom = smsc75xx_ethtool_set_eeprom,
0742     .get_wol    = smsc75xx_ethtool_get_wol,
0743     .set_wol    = smsc75xx_ethtool_set_wol,
0744     .get_link_ksettings = usbnet_get_link_ksettings_mii,
0745     .set_link_ksettings = usbnet_set_link_ksettings_mii,
0746 };
0747 
0748 static int smsc75xx_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
0749 {
0750     struct usbnet *dev = netdev_priv(netdev);
0751 
0752     if (!netif_running(netdev))
0753         return -EINVAL;
0754 
0755     return generic_mii_ioctl(&dev->mii, if_mii(rq), cmd, NULL);
0756 }
0757 
0758 static void smsc75xx_init_mac_address(struct usbnet *dev)
0759 {
0760     u8 addr[ETH_ALEN];
0761 
0762     /* maybe the boot loader passed the MAC address in devicetree */
0763     if (!platform_get_ethdev_address(&dev->udev->dev, dev->net)) {
0764         if (is_valid_ether_addr(dev->net->dev_addr)) {
0765             /* device tree values are valid so use them */
0766             netif_dbg(dev, ifup, dev->net, "MAC address read from the device tree\n");
0767             return;
0768         }
0769     }
0770 
0771     /* try reading mac address from EEPROM */
0772     if (smsc75xx_read_eeprom(dev, EEPROM_MAC_OFFSET, ETH_ALEN, addr) == 0) {
0773         eth_hw_addr_set(dev->net, addr);
0774         if (is_valid_ether_addr(dev->net->dev_addr)) {
0775             /* eeprom values are valid so use them */
0776             netif_dbg(dev, ifup, dev->net,
0777                   "MAC address read from EEPROM\n");
0778             return;
0779         }
0780     }
0781 
0782     /* no useful static MAC address found. generate a random one */
0783     eth_hw_addr_random(dev->net);
0784     netif_dbg(dev, ifup, dev->net, "MAC address set to eth_random_addr\n");
0785 }
0786 
0787 static int smsc75xx_set_mac_address(struct usbnet *dev)
0788 {
0789     u32 addr_lo = dev->net->dev_addr[0] | dev->net->dev_addr[1] << 8 |
0790         dev->net->dev_addr[2] << 16 | dev->net->dev_addr[3] << 24;
0791     u32 addr_hi = dev->net->dev_addr[4] | dev->net->dev_addr[5] << 8;
0792 
0793     int ret = smsc75xx_write_reg(dev, RX_ADDRH, addr_hi);
0794     if (ret < 0) {
0795         netdev_warn(dev->net, "Failed to write RX_ADDRH: %d\n", ret);
0796         return ret;
0797     }
0798 
0799     ret = smsc75xx_write_reg(dev, RX_ADDRL, addr_lo);
0800     if (ret < 0) {
0801         netdev_warn(dev->net, "Failed to write RX_ADDRL: %d\n", ret);
0802         return ret;
0803     }
0804 
0805     addr_hi |= ADDR_FILTX_FB_VALID;
0806     ret = smsc75xx_write_reg(dev, ADDR_FILTX, addr_hi);
0807     if (ret < 0) {
0808         netdev_warn(dev->net, "Failed to write ADDR_FILTX: %d\n", ret);
0809         return ret;
0810     }
0811 
0812     ret = smsc75xx_write_reg(dev, ADDR_FILTX + 4, addr_lo);
0813     if (ret < 0)
0814         netdev_warn(dev->net, "Failed to write ADDR_FILTX+4: %d\n", ret);
0815 
0816     return ret;
0817 }
0818 
0819 static int smsc75xx_phy_initialize(struct usbnet *dev)
0820 {
0821     int bmcr, ret, timeout = 0;
0822 
0823     /* Initialize MII structure */
0824     dev->mii.dev = dev->net;
0825     dev->mii.mdio_read = smsc75xx_mdio_read;
0826     dev->mii.mdio_write = smsc75xx_mdio_write;
0827     dev->mii.phy_id_mask = 0x1f;
0828     dev->mii.reg_num_mask = 0x1f;
0829     dev->mii.supports_gmii = 1;
0830     dev->mii.phy_id = SMSC75XX_INTERNAL_PHY_ID;
0831 
0832     /* reset phy and wait for reset to complete */
0833     smsc75xx_mdio_write(dev->net, dev->mii.phy_id, MII_BMCR, BMCR_RESET);
0834 
0835     do {
0836         msleep(10);
0837         bmcr = smsc75xx_mdio_read(dev->net, dev->mii.phy_id, MII_BMCR);
0838         if (bmcr < 0) {
0839             netdev_warn(dev->net, "Error reading MII_BMCR\n");
0840             return bmcr;
0841         }
0842         timeout++;
0843     } while ((bmcr & BMCR_RESET) && (timeout < 100));
0844 
0845     if (timeout >= 100) {
0846         netdev_warn(dev->net, "timeout on PHY Reset\n");
0847         return -EIO;
0848     }
0849 
0850     /* phy workaround for gig link */
0851     smsc75xx_phy_gig_workaround(dev);
0852 
0853     smsc75xx_mdio_write(dev->net, dev->mii.phy_id, MII_ADVERTISE,
0854         ADVERTISE_ALL | ADVERTISE_CSMA | ADVERTISE_PAUSE_CAP |
0855         ADVERTISE_PAUSE_ASYM);
0856     smsc75xx_mdio_write(dev->net, dev->mii.phy_id, MII_CTRL1000,
0857         ADVERTISE_1000FULL);
0858 
0859     /* read and write to clear phy interrupt status */
0860     ret = smsc75xx_mdio_read(dev->net, dev->mii.phy_id, PHY_INT_SRC);
0861     if (ret < 0) {
0862         netdev_warn(dev->net, "Error reading PHY_INT_SRC\n");
0863         return ret;
0864     }
0865 
0866     smsc75xx_mdio_write(dev->net, dev->mii.phy_id, PHY_INT_SRC, 0xffff);
0867 
0868     smsc75xx_mdio_write(dev->net, dev->mii.phy_id, PHY_INT_MASK,
0869         PHY_INT_MASK_DEFAULT);
0870     mii_nway_restart(&dev->mii);
0871 
0872     netif_dbg(dev, ifup, dev->net, "phy initialised successfully\n");
0873     return 0;
0874 }
0875 
0876 static int smsc75xx_set_rx_max_frame_length(struct usbnet *dev, int size)
0877 {
0878     int ret = 0;
0879     u32 buf;
0880     bool rxenabled;
0881 
0882     ret = smsc75xx_read_reg(dev, MAC_RX, &buf);
0883     if (ret < 0) {
0884         netdev_warn(dev->net, "Failed to read MAC_RX: %d\n", ret);
0885         return ret;
0886     }
0887 
0888     rxenabled = ((buf & MAC_RX_RXEN) != 0);
0889 
0890     if (rxenabled) {
0891         buf &= ~MAC_RX_RXEN;
0892         ret = smsc75xx_write_reg(dev, MAC_RX, buf);
0893         if (ret < 0) {
0894             netdev_warn(dev->net, "Failed to write MAC_RX: %d\n", ret);
0895             return ret;
0896         }
0897     }
0898 
0899     /* add 4 to size for FCS */
0900     buf &= ~MAC_RX_MAX_SIZE;
0901     buf |= (((size + 4) << MAC_RX_MAX_SIZE_SHIFT) & MAC_RX_MAX_SIZE);
0902 
0903     ret = smsc75xx_write_reg(dev, MAC_RX, buf);
0904     if (ret < 0) {
0905         netdev_warn(dev->net, "Failed to write MAC_RX: %d\n", ret);
0906         return ret;
0907     }
0908 
0909     if (rxenabled) {
0910         buf |= MAC_RX_RXEN;
0911         ret = smsc75xx_write_reg(dev, MAC_RX, buf);
0912         if (ret < 0) {
0913             netdev_warn(dev->net, "Failed to write MAC_RX: %d\n", ret);
0914             return ret;
0915         }
0916     }
0917 
0918     return 0;
0919 }
0920 
0921 static int smsc75xx_change_mtu(struct net_device *netdev, int new_mtu)
0922 {
0923     struct usbnet *dev = netdev_priv(netdev);
0924     int ret;
0925 
0926     ret = smsc75xx_set_rx_max_frame_length(dev, new_mtu + ETH_HLEN);
0927     if (ret < 0) {
0928         netdev_warn(dev->net, "Failed to set mac rx frame length\n");
0929         return ret;
0930     }
0931 
0932     return usbnet_change_mtu(netdev, new_mtu);
0933 }
0934 
0935 /* Enable or disable Rx checksum offload engine */
0936 static int smsc75xx_set_features(struct net_device *netdev,
0937     netdev_features_t features)
0938 {
0939     struct usbnet *dev = netdev_priv(netdev);
0940     struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);
0941     unsigned long flags;
0942     int ret;
0943 
0944     spin_lock_irqsave(&pdata->rfe_ctl_lock, flags);
0945 
0946     if (features & NETIF_F_RXCSUM)
0947         pdata->rfe_ctl |= RFE_CTL_TCPUDP_CKM | RFE_CTL_IP_CKM;
0948     else
0949         pdata->rfe_ctl &= ~(RFE_CTL_TCPUDP_CKM | RFE_CTL_IP_CKM);
0950 
0951     spin_unlock_irqrestore(&pdata->rfe_ctl_lock, flags);
0952     /* it's racing here! */
0953 
0954     ret = smsc75xx_write_reg(dev, RFE_CTL, pdata->rfe_ctl);
0955     if (ret < 0) {
0956         netdev_warn(dev->net, "Error writing RFE_CTL\n");
0957         return ret;
0958     }
0959     return 0;
0960 }
0961 
0962 static int smsc75xx_wait_ready(struct usbnet *dev, int in_pm)
0963 {
0964     int timeout = 0;
0965 
0966     do {
0967         u32 buf;
0968         int ret;
0969 
0970         ret = __smsc75xx_read_reg(dev, PMT_CTL, &buf, in_pm);
0971 
0972         if (ret < 0) {
0973             netdev_warn(dev->net, "Failed to read PMT_CTL: %d\n", ret);
0974             return ret;
0975         }
0976 
0977         if (buf & PMT_CTL_DEV_RDY)
0978             return 0;
0979 
0980         msleep(10);
0981         timeout++;
0982     } while (timeout < 100);
0983 
0984     netdev_warn(dev->net, "timeout waiting for device ready\n");
0985     return -EIO;
0986 }
0987 
0988 static int smsc75xx_phy_gig_workaround(struct usbnet *dev)
0989 {
0990     struct mii_if_info *mii = &dev->mii;
0991     int ret = 0, timeout = 0;
0992     u32 buf, link_up = 0;
0993 
0994     /* Set the phy in Gig loopback */
0995     smsc75xx_mdio_write(dev->net, mii->phy_id, MII_BMCR, 0x4040);
0996 
0997     /* Wait for the link up */
0998     do {
0999         link_up = smsc75xx_link_ok_nopm(dev);
1000         usleep_range(10000, 20000);
1001         timeout++;
1002     } while ((!link_up) && (timeout < 1000));
1003 
1004     if (timeout >= 1000) {
1005         netdev_warn(dev->net, "Timeout waiting for PHY link up\n");
1006         return -EIO;
1007     }
1008 
1009     /* phy reset */
1010     ret = smsc75xx_read_reg(dev, PMT_CTL, &buf);
1011     if (ret < 0) {
1012         netdev_warn(dev->net, "Failed to read PMT_CTL: %d\n", ret);
1013         return ret;
1014     }
1015 
1016     buf |= PMT_CTL_PHY_RST;
1017 
1018     ret = smsc75xx_write_reg(dev, PMT_CTL, buf);
1019     if (ret < 0) {
1020         netdev_warn(dev->net, "Failed to write PMT_CTL: %d\n", ret);
1021         return ret;
1022     }
1023 
1024     timeout = 0;
1025     do {
1026         usleep_range(10000, 20000);
1027         ret = smsc75xx_read_reg(dev, PMT_CTL, &buf);
1028         if (ret < 0) {
1029             netdev_warn(dev->net, "Failed to read PMT_CTL: %d\n",
1030                     ret);
1031             return ret;
1032         }
1033         timeout++;
1034     } while ((buf & PMT_CTL_PHY_RST) && (timeout < 100));
1035 
1036     if (timeout >= 100) {
1037         netdev_warn(dev->net, "timeout waiting for PHY Reset\n");
1038         return -EIO;
1039     }
1040 
1041     return 0;
1042 }
1043 
1044 static int smsc75xx_reset(struct usbnet *dev)
1045 {
1046     struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);
1047     u32 buf;
1048     int ret = 0, timeout;
1049 
1050     netif_dbg(dev, ifup, dev->net, "entering smsc75xx_reset\n");
1051 
1052     ret = smsc75xx_wait_ready(dev, 0);
1053     if (ret < 0) {
1054         netdev_warn(dev->net, "device not ready in smsc75xx_reset\n");
1055         return ret;
1056     }
1057 
1058     ret = smsc75xx_read_reg(dev, HW_CFG, &buf);
1059     if (ret < 0) {
1060         netdev_warn(dev->net, "Failed to read HW_CFG: %d\n", ret);
1061         return ret;
1062     }
1063 
1064     buf |= HW_CFG_LRST;
1065 
1066     ret = smsc75xx_write_reg(dev, HW_CFG, buf);
1067     if (ret < 0) {
1068         netdev_warn(dev->net, "Failed to write HW_CFG: %d\n", ret);
1069         return ret;
1070     }
1071 
1072     timeout = 0;
1073     do {
1074         msleep(10);
1075         ret = smsc75xx_read_reg(dev, HW_CFG, &buf);
1076         if (ret < 0) {
1077             netdev_warn(dev->net, "Failed to read HW_CFG: %d\n", ret);
1078             return ret;
1079         }
1080         timeout++;
1081     } while ((buf & HW_CFG_LRST) && (timeout < 100));
1082 
1083     if (timeout >= 100) {
1084         netdev_warn(dev->net, "timeout on completion of Lite Reset\n");
1085         return -EIO;
1086     }
1087 
1088     netif_dbg(dev, ifup, dev->net, "Lite reset complete, resetting PHY\n");
1089 
1090     ret = smsc75xx_read_reg(dev, PMT_CTL, &buf);
1091     if (ret < 0) {
1092         netdev_warn(dev->net, "Failed to read PMT_CTL: %d\n", ret);
1093         return ret;
1094     }
1095 
1096     buf |= PMT_CTL_PHY_RST;
1097 
1098     ret = smsc75xx_write_reg(dev, PMT_CTL, buf);
1099     if (ret < 0) {
1100         netdev_warn(dev->net, "Failed to write PMT_CTL: %d\n", ret);
1101         return ret;
1102     }
1103 
1104     timeout = 0;
1105     do {
1106         msleep(10);
1107         ret = smsc75xx_read_reg(dev, PMT_CTL, &buf);
1108         if (ret < 0) {
1109             netdev_warn(dev->net, "Failed to read PMT_CTL: %d\n", ret);
1110             return ret;
1111         }
1112         timeout++;
1113     } while ((buf & PMT_CTL_PHY_RST) && (timeout < 100));
1114 
1115     if (timeout >= 100) {
1116         netdev_warn(dev->net, "timeout waiting for PHY Reset\n");
1117         return -EIO;
1118     }
1119 
1120     netif_dbg(dev, ifup, dev->net, "PHY reset complete\n");
1121 
1122     ret = smsc75xx_set_mac_address(dev);
1123     if (ret < 0) {
1124         netdev_warn(dev->net, "Failed to set mac address\n");
1125         return ret;
1126     }
1127 
1128     netif_dbg(dev, ifup, dev->net, "MAC Address: %pM\n",
1129           dev->net->dev_addr);
1130 
1131     ret = smsc75xx_read_reg(dev, HW_CFG, &buf);
1132     if (ret < 0) {
1133         netdev_warn(dev->net, "Failed to read HW_CFG: %d\n", ret);
1134         return ret;
1135     }
1136 
1137     netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG : 0x%08x\n",
1138           buf);
1139 
1140     buf |= HW_CFG_BIR;
1141 
1142     ret = smsc75xx_write_reg(dev, HW_CFG, buf);
1143     if (ret < 0) {
1144         netdev_warn(dev->net,  "Failed to write HW_CFG: %d\n", ret);
1145         return ret;
1146     }
1147 
1148     ret = smsc75xx_read_reg(dev, HW_CFG, &buf);
1149     if (ret < 0) {
1150         netdev_warn(dev->net, "Failed to read HW_CFG: %d\n", ret);
1151         return ret;
1152     }
1153 
1154     netif_dbg(dev, ifup, dev->net, "Read Value from HW_CFG after writing HW_CFG_BIR: 0x%08x\n",
1155           buf);
1156 
1157     if (!turbo_mode) {
1158         buf = 0;
1159         dev->rx_urb_size = MAX_SINGLE_PACKET_SIZE;
1160     } else if (dev->udev->speed == USB_SPEED_HIGH) {
1161         buf = DEFAULT_HS_BURST_CAP_SIZE / HS_USB_PKT_SIZE;
1162         dev->rx_urb_size = DEFAULT_HS_BURST_CAP_SIZE;
1163     } else {
1164         buf = DEFAULT_FS_BURST_CAP_SIZE / FS_USB_PKT_SIZE;
1165         dev->rx_urb_size = DEFAULT_FS_BURST_CAP_SIZE;
1166     }
1167 
1168     netif_dbg(dev, ifup, dev->net, "rx_urb_size=%ld\n",
1169           (ulong)dev->rx_urb_size);
1170 
1171     ret = smsc75xx_write_reg(dev, BURST_CAP, buf);
1172     if (ret < 0) {
1173         netdev_warn(dev->net, "Failed to write BURST_CAP: %d\n", ret);
1174         return ret;
1175     }
1176 
1177     ret = smsc75xx_read_reg(dev, BURST_CAP, &buf);
1178     if (ret < 0) {
1179         netdev_warn(dev->net, "Failed to read BURST_CAP: %d\n", ret);
1180         return ret;
1181     }
1182 
1183     netif_dbg(dev, ifup, dev->net,
1184           "Read Value from BURST_CAP after writing: 0x%08x\n", buf);
1185 
1186     ret = smsc75xx_write_reg(dev, BULK_IN_DLY, DEFAULT_BULK_IN_DELAY);
1187     if (ret < 0) {
1188         netdev_warn(dev->net, "Failed to write BULK_IN_DLY: %d\n", ret);
1189         return ret;
1190     }
1191 
1192     ret = smsc75xx_read_reg(dev, BULK_IN_DLY, &buf);
1193     if (ret < 0) {
1194         netdev_warn(dev->net, "Failed to read BULK_IN_DLY: %d\n", ret);
1195         return ret;
1196     }
1197 
1198     netif_dbg(dev, ifup, dev->net,
1199           "Read Value from BULK_IN_DLY after writing: 0x%08x\n", buf);
1200 
1201     if (turbo_mode) {
1202         ret = smsc75xx_read_reg(dev, HW_CFG, &buf);
1203         if (ret < 0) {
1204             netdev_warn(dev->net, "Failed to read HW_CFG: %d\n", ret);
1205             return ret;
1206         }
1207 
1208         netif_dbg(dev, ifup, dev->net, "HW_CFG: 0x%08x\n", buf);
1209 
1210         buf |= (HW_CFG_MEF | HW_CFG_BCE);
1211 
1212         ret = smsc75xx_write_reg(dev, HW_CFG, buf);
1213         if (ret < 0) {
1214             netdev_warn(dev->net, "Failed to write HW_CFG: %d\n", ret);
1215             return ret;
1216         }
1217 
1218         ret = smsc75xx_read_reg(dev, HW_CFG, &buf);
1219         if (ret < 0) {
1220             netdev_warn(dev->net, "Failed to read HW_CFG: %d\n", ret);
1221             return ret;
1222         }
1223 
1224         netif_dbg(dev, ifup, dev->net, "HW_CFG: 0x%08x\n", buf);
1225     }
1226 
1227     /* set FIFO sizes */
1228     buf = (MAX_RX_FIFO_SIZE - 512) / 512;
1229     ret = smsc75xx_write_reg(dev, FCT_RX_FIFO_END, buf);
1230     if (ret < 0) {
1231         netdev_warn(dev->net, "Failed to write FCT_RX_FIFO_END: %d\n", ret);
1232         return ret;
1233     }
1234 
1235     netif_dbg(dev, ifup, dev->net, "FCT_RX_FIFO_END set to 0x%08x\n", buf);
1236 
1237     buf = (MAX_TX_FIFO_SIZE - 512) / 512;
1238     ret = smsc75xx_write_reg(dev, FCT_TX_FIFO_END, buf);
1239     if (ret < 0) {
1240         netdev_warn(dev->net, "Failed to write FCT_TX_FIFO_END: %d\n", ret);
1241         return ret;
1242     }
1243 
1244     netif_dbg(dev, ifup, dev->net, "FCT_TX_FIFO_END set to 0x%08x\n", buf);
1245 
1246     ret = smsc75xx_write_reg(dev, INT_STS, INT_STS_CLEAR_ALL);
1247     if (ret < 0) {
1248         netdev_warn(dev->net, "Failed to write INT_STS: %d\n", ret);
1249         return ret;
1250     }
1251 
1252     ret = smsc75xx_read_reg(dev, ID_REV, &buf);
1253     if (ret < 0) {
1254         netdev_warn(dev->net, "Failed to read ID_REV: %d\n", ret);
1255         return ret;
1256     }
1257 
1258     netif_dbg(dev, ifup, dev->net, "ID_REV = 0x%08x\n", buf);
1259 
1260     ret = smsc75xx_read_reg(dev, E2P_CMD, &buf);
1261     if (ret < 0) {
1262         netdev_warn(dev->net, "Failed to read E2P_CMD: %d\n", ret);
1263         return ret;
1264     }
1265 
1266     /* only set default GPIO/LED settings if no EEPROM is detected */
1267     if (!(buf & E2P_CMD_LOADED)) {
1268         ret = smsc75xx_read_reg(dev, LED_GPIO_CFG, &buf);
1269         if (ret < 0) {
1270             netdev_warn(dev->net, "Failed to read LED_GPIO_CFG: %d\n", ret);
1271             return ret;
1272         }
1273 
1274         buf &= ~(LED_GPIO_CFG_LED2_FUN_SEL | LED_GPIO_CFG_LED10_FUN_SEL);
1275         buf |= LED_GPIO_CFG_LEDGPIO_EN | LED_GPIO_CFG_LED2_FUN_SEL;
1276 
1277         ret = smsc75xx_write_reg(dev, LED_GPIO_CFG, buf);
1278         if (ret < 0) {
1279             netdev_warn(dev->net, "Failed to write LED_GPIO_CFG: %d\n", ret);
1280             return ret;
1281         }
1282     }
1283 
1284     ret = smsc75xx_write_reg(dev, FLOW, 0);
1285     if (ret < 0) {
1286         netdev_warn(dev->net, "Failed to write FLOW: %d\n", ret);
1287         return ret;
1288     }
1289 
1290     ret = smsc75xx_write_reg(dev, FCT_FLOW, 0);
1291     if (ret < 0) {
1292         netdev_warn(dev->net, "Failed to write FCT_FLOW: %d\n", ret);
1293         return ret;
1294     }
1295 
1296     /* Don't need rfe_ctl_lock during initialisation */
1297     ret = smsc75xx_read_reg(dev, RFE_CTL, &pdata->rfe_ctl);
1298     if (ret < 0) {
1299         netdev_warn(dev->net, "Failed to read RFE_CTL: %d\n", ret);
1300         return ret;
1301     }
1302 
1303     pdata->rfe_ctl |= RFE_CTL_AB | RFE_CTL_DPF;
1304 
1305     ret = smsc75xx_write_reg(dev, RFE_CTL, pdata->rfe_ctl);
1306     if (ret < 0) {
1307         netdev_warn(dev->net, "Failed to write RFE_CTL: %d\n", ret);
1308         return ret;
1309     }
1310 
1311     ret = smsc75xx_read_reg(dev, RFE_CTL, &pdata->rfe_ctl);
1312     if (ret < 0) {
1313         netdev_warn(dev->net, "Failed to read RFE_CTL: %d\n", ret);
1314         return ret;
1315     }
1316 
1317     netif_dbg(dev, ifup, dev->net, "RFE_CTL set to 0x%08x\n",
1318           pdata->rfe_ctl);
1319 
1320     /* Enable or disable checksum offload engines */
1321     smsc75xx_set_features(dev->net, dev->net->features);
1322 
1323     smsc75xx_set_multicast(dev->net);
1324 
1325     ret = smsc75xx_phy_initialize(dev);
1326     if (ret < 0) {
1327         netdev_warn(dev->net, "Failed to initialize PHY: %d\n", ret);
1328         return ret;
1329     }
1330 
1331     ret = smsc75xx_read_reg(dev, INT_EP_CTL, &buf);
1332     if (ret < 0) {
1333         netdev_warn(dev->net, "Failed to read INT_EP_CTL: %d\n", ret);
1334         return ret;
1335     }
1336 
1337     /* enable PHY interrupts */
1338     buf |= INT_ENP_PHY_INT;
1339 
1340     ret = smsc75xx_write_reg(dev, INT_EP_CTL, buf);
1341     if (ret < 0) {
1342         netdev_warn(dev->net, "Failed to write INT_EP_CTL: %d\n", ret);
1343         return ret;
1344     }
1345 
1346     /* allow mac to detect speed and duplex from phy */
1347     ret = smsc75xx_read_reg(dev, MAC_CR, &buf);
1348     if (ret < 0) {
1349         netdev_warn(dev->net, "Failed to read MAC_CR: %d\n", ret);
1350         return ret;
1351     }
1352 
1353     buf |= (MAC_CR_ADD | MAC_CR_ASD);
1354     ret = smsc75xx_write_reg(dev, MAC_CR, buf);
1355     if (ret < 0) {
1356         netdev_warn(dev->net, "Failed to write MAC_CR: %d\n", ret);
1357         return ret;
1358     }
1359 
1360     ret = smsc75xx_read_reg(dev, MAC_TX, &buf);
1361     if (ret < 0) {
1362         netdev_warn(dev->net, "Failed to read MAC_TX: %d\n", ret);
1363         return ret;
1364     }
1365 
1366     buf |= MAC_TX_TXEN;
1367 
1368     ret = smsc75xx_write_reg(dev, MAC_TX, buf);
1369     if (ret < 0) {
1370         netdev_warn(dev->net, "Failed to write MAC_TX: %d\n", ret);
1371         return ret;
1372     }
1373 
1374     netif_dbg(dev, ifup, dev->net, "MAC_TX set to 0x%08x\n", buf);
1375 
1376     ret = smsc75xx_read_reg(dev, FCT_TX_CTL, &buf);
1377     if (ret < 0) {
1378         netdev_warn(dev->net, "Failed to read FCT_TX_CTL: %d\n", ret);
1379         return ret;
1380     }
1381 
1382     buf |= FCT_TX_CTL_EN;
1383 
1384     ret = smsc75xx_write_reg(dev, FCT_TX_CTL, buf);
1385     if (ret < 0) {
1386         netdev_warn(dev->net, "Failed to write FCT_TX_CTL: %d\n", ret);
1387         return ret;
1388     }
1389 
1390     netif_dbg(dev, ifup, dev->net, "FCT_TX_CTL set to 0x%08x\n", buf);
1391 
1392     ret = smsc75xx_set_rx_max_frame_length(dev, dev->net->mtu + ETH_HLEN);
1393     if (ret < 0) {
1394         netdev_warn(dev->net, "Failed to set max rx frame length\n");
1395         return ret;
1396     }
1397 
1398     ret = smsc75xx_read_reg(dev, MAC_RX, &buf);
1399     if (ret < 0) {
1400         netdev_warn(dev->net, "Failed to read MAC_RX: %d\n", ret);
1401         return ret;
1402     }
1403 
1404     buf |= MAC_RX_RXEN;
1405 
1406     ret = smsc75xx_write_reg(dev, MAC_RX, buf);
1407     if (ret < 0) {
1408         netdev_warn(dev->net, "Failed to write MAC_RX: %d\n", ret);
1409         return ret;
1410     }
1411 
1412     netif_dbg(dev, ifup, dev->net, "MAC_RX set to 0x%08x\n", buf);
1413 
1414     ret = smsc75xx_read_reg(dev, FCT_RX_CTL, &buf);
1415     if (ret < 0) {
1416         netdev_warn(dev->net, "Failed to read FCT_RX_CTL: %d\n", ret);
1417         return ret;
1418     }
1419 
1420     buf |= FCT_RX_CTL_EN;
1421 
1422     ret = smsc75xx_write_reg(dev, FCT_RX_CTL, buf);
1423     if (ret < 0) {
1424         netdev_warn(dev->net, "Failed to write FCT_RX_CTL: %d\n", ret);
1425         return ret;
1426     }
1427 
1428     netif_dbg(dev, ifup, dev->net, "FCT_RX_CTL set to 0x%08x\n", buf);
1429 
1430     netif_dbg(dev, ifup, dev->net, "smsc75xx_reset, return 0\n");
1431     return 0;
1432 }
1433 
1434 static const struct net_device_ops smsc75xx_netdev_ops = {
1435     .ndo_open       = usbnet_open,
1436     .ndo_stop       = usbnet_stop,
1437     .ndo_start_xmit     = usbnet_start_xmit,
1438     .ndo_tx_timeout     = usbnet_tx_timeout,
1439     .ndo_get_stats64    = dev_get_tstats64,
1440     .ndo_change_mtu     = smsc75xx_change_mtu,
1441     .ndo_set_mac_address    = eth_mac_addr,
1442     .ndo_validate_addr  = eth_validate_addr,
1443     .ndo_eth_ioctl      = smsc75xx_ioctl,
1444     .ndo_set_rx_mode    = smsc75xx_set_multicast,
1445     .ndo_set_features   = smsc75xx_set_features,
1446 };
1447 
1448 static int smsc75xx_bind(struct usbnet *dev, struct usb_interface *intf)
1449 {
1450     struct smsc75xx_priv *pdata = NULL;
1451     int ret;
1452 
1453     printk(KERN_INFO SMSC_CHIPNAME " v" SMSC_DRIVER_VERSION "\n");
1454 
1455     ret = usbnet_get_endpoints(dev, intf);
1456     if (ret < 0) {
1457         netdev_warn(dev->net, "usbnet_get_endpoints failed: %d\n", ret);
1458         return ret;
1459     }
1460 
1461     dev->data[0] = (unsigned long)kzalloc(sizeof(struct smsc75xx_priv),
1462                           GFP_KERNEL);
1463 
1464     pdata = (struct smsc75xx_priv *)(dev->data[0]);
1465     if (!pdata)
1466         return -ENOMEM;
1467 
1468     pdata->dev = dev;
1469 
1470     spin_lock_init(&pdata->rfe_ctl_lock);
1471     mutex_init(&pdata->dataport_mutex);
1472 
1473     INIT_WORK(&pdata->set_multicast, smsc75xx_deferred_multicast_write);
1474 
1475     if (DEFAULT_TX_CSUM_ENABLE)
1476         dev->net->features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
1477 
1478     if (DEFAULT_RX_CSUM_ENABLE)
1479         dev->net->features |= NETIF_F_RXCSUM;
1480 
1481     dev->net->hw_features = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
1482                 NETIF_F_RXCSUM;
1483 
1484     ret = smsc75xx_wait_ready(dev, 0);
1485     if (ret < 0) {
1486         netdev_warn(dev->net, "device not ready in smsc75xx_bind\n");
1487         goto free_pdata;
1488     }
1489 
1490     smsc75xx_init_mac_address(dev);
1491 
1492     /* Init all registers */
1493     ret = smsc75xx_reset(dev);
1494     if (ret < 0) {
1495         netdev_warn(dev->net, "smsc75xx_reset error %d\n", ret);
1496         goto cancel_work;
1497     }
1498 
1499     dev->net->netdev_ops = &smsc75xx_netdev_ops;
1500     dev->net->ethtool_ops = &smsc75xx_ethtool_ops;
1501     dev->net->flags |= IFF_MULTICAST;
1502     dev->net->hard_header_len += SMSC75XX_TX_OVERHEAD;
1503     dev->hard_mtu = dev->net->mtu + dev->net->hard_header_len;
1504     dev->net->max_mtu = MAX_SINGLE_PACKET_SIZE;
1505     return 0;
1506 
1507 cancel_work:
1508     cancel_work_sync(&pdata->set_multicast);
1509 free_pdata:
1510     kfree(pdata);
1511     dev->data[0] = 0;
1512     return ret;
1513 }
1514 
1515 static void smsc75xx_unbind(struct usbnet *dev, struct usb_interface *intf)
1516 {
1517     struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);
1518     if (pdata) {
1519         cancel_work_sync(&pdata->set_multicast);
1520         netif_dbg(dev, ifdown, dev->net, "free pdata\n");
1521         kfree(pdata);
1522         dev->data[0] = 0;
1523     }
1524 }
1525 
1526 static u16 smsc_crc(const u8 *buffer, size_t len)
1527 {
1528     return bitrev16(crc16(0xFFFF, buffer, len));
1529 }
1530 
1531 static int smsc75xx_write_wuff(struct usbnet *dev, int filter, u32 wuf_cfg,
1532                    u32 wuf_mask1)
1533 {
1534     int cfg_base = WUF_CFGX + filter * 4;
1535     int mask_base = WUF_MASKX + filter * 16;
1536     int ret;
1537 
1538     ret = smsc75xx_write_reg(dev, cfg_base, wuf_cfg);
1539     if (ret < 0) {
1540         netdev_warn(dev->net, "Error writing WUF_CFGX\n");
1541         return ret;
1542     }
1543 
1544     ret = smsc75xx_write_reg(dev, mask_base, wuf_mask1);
1545     if (ret < 0) {
1546         netdev_warn(dev->net, "Error writing WUF_MASKX\n");
1547         return ret;
1548     }
1549 
1550     ret = smsc75xx_write_reg(dev, mask_base + 4, 0);
1551     if (ret < 0) {
1552         netdev_warn(dev->net, "Error writing WUF_MASKX\n");
1553         return ret;
1554     }
1555 
1556     ret = smsc75xx_write_reg(dev, mask_base + 8, 0);
1557     if (ret < 0) {
1558         netdev_warn(dev->net, "Error writing WUF_MASKX\n");
1559         return ret;
1560     }
1561 
1562     ret = smsc75xx_write_reg(dev, mask_base + 12, 0);
1563     if (ret < 0) {
1564         netdev_warn(dev->net, "Error writing WUF_MASKX\n");
1565         return ret;
1566     }
1567 
1568     return 0;
1569 }
1570 
1571 static int smsc75xx_enter_suspend0(struct usbnet *dev)
1572 {
1573     struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);
1574     u32 val;
1575     int ret;
1576 
1577     ret = smsc75xx_read_reg_nopm(dev, PMT_CTL, &val);
1578     if (ret < 0) {
1579         netdev_warn(dev->net, "Error reading PMT_CTL\n");
1580         return ret;
1581     }
1582 
1583     val &= (~(PMT_CTL_SUS_MODE | PMT_CTL_PHY_RST));
1584     val |= PMT_CTL_SUS_MODE_0 | PMT_CTL_WOL_EN | PMT_CTL_WUPS;
1585 
1586     ret = smsc75xx_write_reg_nopm(dev, PMT_CTL, val);
1587     if (ret < 0) {
1588         netdev_warn(dev->net, "Error writing PMT_CTL\n");
1589         return ret;
1590     }
1591 
1592     pdata->suspend_flags |= SUSPEND_SUSPEND0;
1593 
1594     return 0;
1595 }
1596 
1597 static int smsc75xx_enter_suspend1(struct usbnet *dev)
1598 {
1599     struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);
1600     u32 val;
1601     int ret;
1602 
1603     ret = smsc75xx_read_reg_nopm(dev, PMT_CTL, &val);
1604     if (ret < 0) {
1605         netdev_warn(dev->net, "Error reading PMT_CTL\n");
1606         return ret;
1607     }
1608 
1609     val &= ~(PMT_CTL_SUS_MODE | PMT_CTL_WUPS | PMT_CTL_PHY_RST);
1610     val |= PMT_CTL_SUS_MODE_1;
1611 
1612     ret = smsc75xx_write_reg_nopm(dev, PMT_CTL, val);
1613     if (ret < 0) {
1614         netdev_warn(dev->net, "Error writing PMT_CTL\n");
1615         return ret;
1616     }
1617 
1618     /* clear wol status, enable energy detection */
1619     val &= ~PMT_CTL_WUPS;
1620     val |= (PMT_CTL_WUPS_ED | PMT_CTL_ED_EN);
1621 
1622     ret = smsc75xx_write_reg_nopm(dev, PMT_CTL, val);
1623     if (ret < 0) {
1624         netdev_warn(dev->net, "Error writing PMT_CTL\n");
1625         return ret;
1626     }
1627 
1628     pdata->suspend_flags |= SUSPEND_SUSPEND1;
1629 
1630     return 0;
1631 }
1632 
1633 static int smsc75xx_enter_suspend2(struct usbnet *dev)
1634 {
1635     struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);
1636     u32 val;
1637     int ret;
1638 
1639     ret = smsc75xx_read_reg_nopm(dev, PMT_CTL, &val);
1640     if (ret < 0) {
1641         netdev_warn(dev->net, "Error reading PMT_CTL\n");
1642         return ret;
1643     }
1644 
1645     val &= ~(PMT_CTL_SUS_MODE | PMT_CTL_WUPS | PMT_CTL_PHY_RST);
1646     val |= PMT_CTL_SUS_MODE_2;
1647 
1648     ret = smsc75xx_write_reg_nopm(dev, PMT_CTL, val);
1649     if (ret < 0) {
1650         netdev_warn(dev->net, "Error writing PMT_CTL\n");
1651         return ret;
1652     }
1653 
1654     pdata->suspend_flags |= SUSPEND_SUSPEND2;
1655 
1656     return 0;
1657 }
1658 
1659 static int smsc75xx_enter_suspend3(struct usbnet *dev)
1660 {
1661     struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);
1662     u32 val;
1663     int ret;
1664 
1665     ret = smsc75xx_read_reg_nopm(dev, FCT_RX_CTL, &val);
1666     if (ret < 0) {
1667         netdev_warn(dev->net, "Error reading FCT_RX_CTL\n");
1668         return ret;
1669     }
1670 
1671     if (val & FCT_RX_CTL_RXUSED) {
1672         netdev_dbg(dev->net, "rx fifo not empty in autosuspend\n");
1673         return -EBUSY;
1674     }
1675 
1676     ret = smsc75xx_read_reg_nopm(dev, PMT_CTL, &val);
1677     if (ret < 0) {
1678         netdev_warn(dev->net, "Error reading PMT_CTL\n");
1679         return ret;
1680     }
1681 
1682     val &= ~(PMT_CTL_SUS_MODE | PMT_CTL_WUPS | PMT_CTL_PHY_RST);
1683     val |= PMT_CTL_SUS_MODE_3 | PMT_CTL_RES_CLR_WKP_EN;
1684 
1685     ret = smsc75xx_write_reg_nopm(dev, PMT_CTL, val);
1686     if (ret < 0) {
1687         netdev_warn(dev->net, "Error writing PMT_CTL\n");
1688         return ret;
1689     }
1690 
1691     /* clear wol status */
1692     val &= ~PMT_CTL_WUPS;
1693     val |= PMT_CTL_WUPS_WOL;
1694 
1695     ret = smsc75xx_write_reg_nopm(dev, PMT_CTL, val);
1696     if (ret < 0) {
1697         netdev_warn(dev->net, "Error writing PMT_CTL\n");
1698         return ret;
1699     }
1700 
1701     pdata->suspend_flags |= SUSPEND_SUSPEND3;
1702 
1703     return 0;
1704 }
1705 
1706 static int smsc75xx_enable_phy_wakeup_interrupts(struct usbnet *dev, u16 mask)
1707 {
1708     struct mii_if_info *mii = &dev->mii;
1709     int ret;
1710 
1711     netdev_dbg(dev->net, "enabling PHY wakeup interrupts\n");
1712 
1713     /* read to clear */
1714     ret = smsc75xx_mdio_read_nopm(dev->net, mii->phy_id, PHY_INT_SRC);
1715     if (ret < 0) {
1716         netdev_warn(dev->net, "Error reading PHY_INT_SRC\n");
1717         return ret;
1718     }
1719 
1720     /* enable interrupt source */
1721     ret = smsc75xx_mdio_read_nopm(dev->net, mii->phy_id, PHY_INT_MASK);
1722     if (ret < 0) {
1723         netdev_warn(dev->net, "Error reading PHY_INT_MASK\n");
1724         return ret;
1725     }
1726 
1727     ret |= mask;
1728 
1729     smsc75xx_mdio_write_nopm(dev->net, mii->phy_id, PHY_INT_MASK, ret);
1730 
1731     return 0;
1732 }
1733 
1734 static int smsc75xx_link_ok_nopm(struct usbnet *dev)
1735 {
1736     struct mii_if_info *mii = &dev->mii;
1737     int ret;
1738 
1739     /* first, a dummy read, needed to latch some MII phys */
1740     ret = smsc75xx_mdio_read_nopm(dev->net, mii->phy_id, MII_BMSR);
1741     if (ret < 0) {
1742         netdev_warn(dev->net, "Error reading MII_BMSR\n");
1743         return ret;
1744     }
1745 
1746     ret = smsc75xx_mdio_read_nopm(dev->net, mii->phy_id, MII_BMSR);
1747     if (ret < 0) {
1748         netdev_warn(dev->net, "Error reading MII_BMSR\n");
1749         return ret;
1750     }
1751 
1752     return !!(ret & BMSR_LSTATUS);
1753 }
1754 
1755 static int smsc75xx_autosuspend(struct usbnet *dev, u32 link_up)
1756 {
1757     int ret;
1758 
1759     if (!netif_running(dev->net)) {
1760         /* interface is ifconfig down so fully power down hw */
1761         netdev_dbg(dev->net, "autosuspend entering SUSPEND2\n");
1762         return smsc75xx_enter_suspend2(dev);
1763     }
1764 
1765     if (!link_up) {
1766         /* link is down so enter EDPD mode */
1767         netdev_dbg(dev->net, "autosuspend entering SUSPEND1\n");
1768 
1769         /* enable PHY wakeup events for if cable is attached */
1770         ret = smsc75xx_enable_phy_wakeup_interrupts(dev,
1771             PHY_INT_MASK_ANEG_COMP);
1772         if (ret < 0) {
1773             netdev_warn(dev->net, "error enabling PHY wakeup ints\n");
1774             return ret;
1775         }
1776 
1777         netdev_info(dev->net, "entering SUSPEND1 mode\n");
1778         return smsc75xx_enter_suspend1(dev);
1779     }
1780 
1781     /* enable PHY wakeup events so we remote wakeup if cable is pulled */
1782     ret = smsc75xx_enable_phy_wakeup_interrupts(dev,
1783         PHY_INT_MASK_LINK_DOWN);
1784     if (ret < 0) {
1785         netdev_warn(dev->net, "error enabling PHY wakeup ints\n");
1786         return ret;
1787     }
1788 
1789     netdev_dbg(dev->net, "autosuspend entering SUSPEND3\n");
1790     return smsc75xx_enter_suspend3(dev);
1791 }
1792 
1793 static int smsc75xx_suspend(struct usb_interface *intf, pm_message_t message)
1794 {
1795     struct usbnet *dev = usb_get_intfdata(intf);
1796     struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);
1797     u32 val, link_up;
1798     int ret;
1799 
1800     ret = usbnet_suspend(intf, message);
1801     if (ret < 0) {
1802         netdev_warn(dev->net, "usbnet_suspend error\n");
1803         return ret;
1804     }
1805 
1806     if (pdata->suspend_flags) {
1807         netdev_warn(dev->net, "error during last resume\n");
1808         pdata->suspend_flags = 0;
1809     }
1810 
1811     /* determine if link is up using only _nopm functions */
1812     link_up = smsc75xx_link_ok_nopm(dev);
1813 
1814     if (message.event == PM_EVENT_AUTO_SUSPEND) {
1815         ret = smsc75xx_autosuspend(dev, link_up);
1816         goto done;
1817     }
1818 
1819     /* if we get this far we're not autosuspending */
1820     /* if no wol options set, or if link is down and we're not waking on
1821      * PHY activity, enter lowest power SUSPEND2 mode
1822      */
1823     if (!(pdata->wolopts & SUPPORTED_WAKE) ||
1824         !(link_up || (pdata->wolopts & WAKE_PHY))) {
1825         netdev_info(dev->net, "entering SUSPEND2 mode\n");
1826 
1827         /* disable energy detect (link up) & wake up events */
1828         ret = smsc75xx_read_reg_nopm(dev, WUCSR, &val);
1829         if (ret < 0) {
1830             netdev_warn(dev->net, "Error reading WUCSR\n");
1831             goto done;
1832         }
1833 
1834         val &= ~(WUCSR_MPEN | WUCSR_WUEN);
1835 
1836         ret = smsc75xx_write_reg_nopm(dev, WUCSR, val);
1837         if (ret < 0) {
1838             netdev_warn(dev->net, "Error writing WUCSR\n");
1839             goto done;
1840         }
1841 
1842         ret = smsc75xx_read_reg_nopm(dev, PMT_CTL, &val);
1843         if (ret < 0) {
1844             netdev_warn(dev->net, "Error reading PMT_CTL\n");
1845             goto done;
1846         }
1847 
1848         val &= ~(PMT_CTL_ED_EN | PMT_CTL_WOL_EN);
1849 
1850         ret = smsc75xx_write_reg_nopm(dev, PMT_CTL, val);
1851         if (ret < 0) {
1852             netdev_warn(dev->net, "Error writing PMT_CTL\n");
1853             goto done;
1854         }
1855 
1856         ret = smsc75xx_enter_suspend2(dev);
1857         goto done;
1858     }
1859 
1860     if (pdata->wolopts & WAKE_PHY) {
1861         ret = smsc75xx_enable_phy_wakeup_interrupts(dev,
1862             (PHY_INT_MASK_ANEG_COMP | PHY_INT_MASK_LINK_DOWN));
1863         if (ret < 0) {
1864             netdev_warn(dev->net, "error enabling PHY wakeup ints\n");
1865             goto done;
1866         }
1867 
1868         /* if link is down then configure EDPD and enter SUSPEND1,
1869          * otherwise enter SUSPEND0 below
1870          */
1871         if (!link_up) {
1872             struct mii_if_info *mii = &dev->mii;
1873             netdev_info(dev->net, "entering SUSPEND1 mode\n");
1874 
1875             /* enable energy detect power-down mode */
1876             ret = smsc75xx_mdio_read_nopm(dev->net, mii->phy_id,
1877                 PHY_MODE_CTRL_STS);
1878             if (ret < 0) {
1879                 netdev_warn(dev->net, "Error reading PHY_MODE_CTRL_STS\n");
1880                 goto done;
1881             }
1882 
1883             ret |= MODE_CTRL_STS_EDPWRDOWN;
1884 
1885             smsc75xx_mdio_write_nopm(dev->net, mii->phy_id,
1886                 PHY_MODE_CTRL_STS, ret);
1887 
1888             /* enter SUSPEND1 mode */
1889             ret = smsc75xx_enter_suspend1(dev);
1890             goto done;
1891         }
1892     }
1893 
1894     if (pdata->wolopts & (WAKE_MCAST | WAKE_ARP)) {
1895         int i, filter = 0;
1896 
1897         /* disable all filters */
1898         for (i = 0; i < WUF_NUM; i++) {
1899             ret = smsc75xx_write_reg_nopm(dev, WUF_CFGX + i * 4, 0);
1900             if (ret < 0) {
1901                 netdev_warn(dev->net, "Error writing WUF_CFGX\n");
1902                 goto done;
1903             }
1904         }
1905 
1906         if (pdata->wolopts & WAKE_MCAST) {
1907             const u8 mcast[] = {0x01, 0x00, 0x5E};
1908             netdev_info(dev->net, "enabling multicast detection\n");
1909 
1910             val = WUF_CFGX_EN | WUF_CFGX_ATYPE_MULTICAST
1911                 | smsc_crc(mcast, 3);
1912             ret = smsc75xx_write_wuff(dev, filter++, val, 0x0007);
1913             if (ret < 0) {
1914                 netdev_warn(dev->net, "Error writing wakeup filter\n");
1915                 goto done;
1916             }
1917         }
1918 
1919         if (pdata->wolopts & WAKE_ARP) {
1920             const u8 arp[] = {0x08, 0x06};
1921             netdev_info(dev->net, "enabling ARP detection\n");
1922 
1923             val = WUF_CFGX_EN | WUF_CFGX_ATYPE_ALL | (0x0C << 16)
1924                 | smsc_crc(arp, 2);
1925             ret = smsc75xx_write_wuff(dev, filter++, val, 0x0003);
1926             if (ret < 0) {
1927                 netdev_warn(dev->net, "Error writing wakeup filter\n");
1928                 goto done;
1929             }
1930         }
1931 
1932         /* clear any pending pattern match packet status */
1933         ret = smsc75xx_read_reg_nopm(dev, WUCSR, &val);
1934         if (ret < 0) {
1935             netdev_warn(dev->net, "Error reading WUCSR\n");
1936             goto done;
1937         }
1938 
1939         val |= WUCSR_WUFR;
1940 
1941         ret = smsc75xx_write_reg_nopm(dev, WUCSR, val);
1942         if (ret < 0) {
1943             netdev_warn(dev->net, "Error writing WUCSR\n");
1944             goto done;
1945         }
1946 
1947         netdev_info(dev->net, "enabling packet match detection\n");
1948         ret = smsc75xx_read_reg_nopm(dev, WUCSR, &val);
1949         if (ret < 0) {
1950             netdev_warn(dev->net, "Error reading WUCSR\n");
1951             goto done;
1952         }
1953 
1954         val |= WUCSR_WUEN;
1955 
1956         ret = smsc75xx_write_reg_nopm(dev, WUCSR, val);
1957         if (ret < 0) {
1958             netdev_warn(dev->net, "Error writing WUCSR\n");
1959             goto done;
1960         }
1961     } else {
1962         netdev_info(dev->net, "disabling packet match detection\n");
1963         ret = smsc75xx_read_reg_nopm(dev, WUCSR, &val);
1964         if (ret < 0) {
1965             netdev_warn(dev->net, "Error reading WUCSR\n");
1966             goto done;
1967         }
1968 
1969         val &= ~WUCSR_WUEN;
1970 
1971         ret = smsc75xx_write_reg_nopm(dev, WUCSR, val);
1972         if (ret < 0) {
1973             netdev_warn(dev->net, "Error writing WUCSR\n");
1974             goto done;
1975         }
1976     }
1977 
1978     /* disable magic, bcast & unicast wakeup sources */
1979     ret = smsc75xx_read_reg_nopm(dev, WUCSR, &val);
1980     if (ret < 0) {
1981         netdev_warn(dev->net, "Error reading WUCSR\n");
1982         goto done;
1983     }
1984 
1985     val &= ~(WUCSR_MPEN | WUCSR_BCST_EN | WUCSR_PFDA_EN);
1986 
1987     ret = smsc75xx_write_reg_nopm(dev, WUCSR, val);
1988     if (ret < 0) {
1989         netdev_warn(dev->net, "Error writing WUCSR\n");
1990         goto done;
1991     }
1992 
1993     if (pdata->wolopts & WAKE_PHY) {
1994         netdev_info(dev->net, "enabling PHY wakeup\n");
1995 
1996         ret = smsc75xx_read_reg_nopm(dev, PMT_CTL, &val);
1997         if (ret < 0) {
1998             netdev_warn(dev->net, "Error reading PMT_CTL\n");
1999             goto done;
2000         }
2001 
2002         /* clear wol status, enable energy detection */
2003         val &= ~PMT_CTL_WUPS;
2004         val |= (PMT_CTL_WUPS_ED | PMT_CTL_ED_EN);
2005 
2006         ret = smsc75xx_write_reg_nopm(dev, PMT_CTL, val);
2007         if (ret < 0) {
2008             netdev_warn(dev->net, "Error writing PMT_CTL\n");
2009             goto done;
2010         }
2011     }
2012 
2013     if (pdata->wolopts & WAKE_MAGIC) {
2014         netdev_info(dev->net, "enabling magic packet wakeup\n");
2015         ret = smsc75xx_read_reg_nopm(dev, WUCSR, &val);
2016         if (ret < 0) {
2017             netdev_warn(dev->net, "Error reading WUCSR\n");
2018             goto done;
2019         }
2020 
2021         /* clear any pending magic packet status */
2022         val |= WUCSR_MPR | WUCSR_MPEN;
2023 
2024         ret = smsc75xx_write_reg_nopm(dev, WUCSR, val);
2025         if (ret < 0) {
2026             netdev_warn(dev->net, "Error writing WUCSR\n");
2027             goto done;
2028         }
2029     }
2030 
2031     if (pdata->wolopts & WAKE_BCAST) {
2032         netdev_info(dev->net, "enabling broadcast detection\n");
2033         ret = smsc75xx_read_reg_nopm(dev, WUCSR, &val);
2034         if (ret < 0) {
2035             netdev_warn(dev->net, "Error reading WUCSR\n");
2036             goto done;
2037         }
2038 
2039         val |= WUCSR_BCAST_FR | WUCSR_BCST_EN;
2040 
2041         ret = smsc75xx_write_reg_nopm(dev, WUCSR, val);
2042         if (ret < 0) {
2043             netdev_warn(dev->net, "Error writing WUCSR\n");
2044             goto done;
2045         }
2046     }
2047 
2048     if (pdata->wolopts & WAKE_UCAST) {
2049         netdev_info(dev->net, "enabling unicast detection\n");
2050         ret = smsc75xx_read_reg_nopm(dev, WUCSR, &val);
2051         if (ret < 0) {
2052             netdev_warn(dev->net, "Error reading WUCSR\n");
2053             goto done;
2054         }
2055 
2056         val |= WUCSR_WUFR | WUCSR_PFDA_EN;
2057 
2058         ret = smsc75xx_write_reg_nopm(dev, WUCSR, val);
2059         if (ret < 0) {
2060             netdev_warn(dev->net, "Error writing WUCSR\n");
2061             goto done;
2062         }
2063     }
2064 
2065     /* enable receiver to enable frame reception */
2066     ret = smsc75xx_read_reg_nopm(dev, MAC_RX, &val);
2067     if (ret < 0) {
2068         netdev_warn(dev->net, "Failed to read MAC_RX: %d\n", ret);
2069         goto done;
2070     }
2071 
2072     val |= MAC_RX_RXEN;
2073 
2074     ret = smsc75xx_write_reg_nopm(dev, MAC_RX, val);
2075     if (ret < 0) {
2076         netdev_warn(dev->net, "Failed to write MAC_RX: %d\n", ret);
2077         goto done;
2078     }
2079 
2080     /* some wol options are enabled, so enter SUSPEND0 */
2081     netdev_info(dev->net, "entering SUSPEND0 mode\n");
2082     ret = smsc75xx_enter_suspend0(dev);
2083 
2084 done:
2085     /*
2086      * TODO: resume() might need to handle the suspend failure
2087      * in system sleep
2088      */
2089     if (ret && PMSG_IS_AUTO(message))
2090         usbnet_resume(intf);
2091     return ret;
2092 }
2093 
2094 static int smsc75xx_resume(struct usb_interface *intf)
2095 {
2096     struct usbnet *dev = usb_get_intfdata(intf);
2097     struct smsc75xx_priv *pdata = (struct smsc75xx_priv *)(dev->data[0]);
2098     u8 suspend_flags = pdata->suspend_flags;
2099     int ret;
2100     u32 val;
2101 
2102     netdev_dbg(dev->net, "resume suspend_flags=0x%02x\n", suspend_flags);
2103 
2104     /* do this first to ensure it's cleared even in error case */
2105     pdata->suspend_flags = 0;
2106 
2107     if (suspend_flags & SUSPEND_ALLMODES) {
2108         /* Disable wakeup sources */
2109         ret = smsc75xx_read_reg_nopm(dev, WUCSR, &val);
2110         if (ret < 0) {
2111             netdev_warn(dev->net, "Error reading WUCSR\n");
2112             return ret;
2113         }
2114 
2115         val &= ~(WUCSR_WUEN | WUCSR_MPEN | WUCSR_PFDA_EN
2116             | WUCSR_BCST_EN);
2117 
2118         ret = smsc75xx_write_reg_nopm(dev, WUCSR, val);
2119         if (ret < 0) {
2120             netdev_warn(dev->net, "Error writing WUCSR\n");
2121             return ret;
2122         }
2123 
2124         /* clear wake-up status */
2125         ret = smsc75xx_read_reg_nopm(dev, PMT_CTL, &val);
2126         if (ret < 0) {
2127             netdev_warn(dev->net, "Error reading PMT_CTL\n");
2128             return ret;
2129         }
2130 
2131         val &= ~PMT_CTL_WOL_EN;
2132         val |= PMT_CTL_WUPS;
2133 
2134         ret = smsc75xx_write_reg_nopm(dev, PMT_CTL, val);
2135         if (ret < 0) {
2136             netdev_warn(dev->net, "Error writing PMT_CTL\n");
2137             return ret;
2138         }
2139     }
2140 
2141     if (suspend_flags & SUSPEND_SUSPEND2) {
2142         netdev_info(dev->net, "resuming from SUSPEND2\n");
2143 
2144         ret = smsc75xx_read_reg_nopm(dev, PMT_CTL, &val);
2145         if (ret < 0) {
2146             netdev_warn(dev->net, "Error reading PMT_CTL\n");
2147             return ret;
2148         }
2149 
2150         val |= PMT_CTL_PHY_PWRUP;
2151 
2152         ret = smsc75xx_write_reg_nopm(dev, PMT_CTL, val);
2153         if (ret < 0) {
2154             netdev_warn(dev->net, "Error writing PMT_CTL\n");
2155             return ret;
2156         }
2157     }
2158 
2159     ret = smsc75xx_wait_ready(dev, 1);
2160     if (ret < 0) {
2161         netdev_warn(dev->net, "device not ready in smsc75xx_resume\n");
2162         return ret;
2163     }
2164 
2165     return usbnet_resume(intf);
2166 }
2167 
2168 static void smsc75xx_rx_csum_offload(struct usbnet *dev, struct sk_buff *skb,
2169                      u32 rx_cmd_a, u32 rx_cmd_b)
2170 {
2171     if (!(dev->net->features & NETIF_F_RXCSUM) ||
2172         unlikely(rx_cmd_a & RX_CMD_A_LCSM)) {
2173         skb->ip_summed = CHECKSUM_NONE;
2174     } else {
2175         skb->csum = ntohs((u16)(rx_cmd_b >> RX_CMD_B_CSUM_SHIFT));
2176         skb->ip_summed = CHECKSUM_COMPLETE;
2177     }
2178 }
2179 
2180 static int smsc75xx_rx_fixup(struct usbnet *dev, struct sk_buff *skb)
2181 {
2182     /* This check is no longer done by usbnet */
2183     if (skb->len < dev->net->hard_header_len)
2184         return 0;
2185 
2186     while (skb->len > 0) {
2187         u32 rx_cmd_a, rx_cmd_b, align_count, size;
2188         struct sk_buff *ax_skb;
2189         unsigned char *packet;
2190 
2191         rx_cmd_a = get_unaligned_le32(skb->data);
2192         skb_pull(skb, 4);
2193 
2194         rx_cmd_b = get_unaligned_le32(skb->data);
2195         skb_pull(skb, 4 + RXW_PADDING);
2196 
2197         packet = skb->data;
2198 
2199         /* get the packet length */
2200         size = (rx_cmd_a & RX_CMD_A_LEN) - RXW_PADDING;
2201         align_count = (4 - ((size + RXW_PADDING) % 4)) % 4;
2202 
2203         if (unlikely(rx_cmd_a & RX_CMD_A_RED)) {
2204             netif_dbg(dev, rx_err, dev->net,
2205                   "Error rx_cmd_a=0x%08x\n", rx_cmd_a);
2206             dev->net->stats.rx_errors++;
2207             dev->net->stats.rx_dropped++;
2208 
2209             if (rx_cmd_a & RX_CMD_A_FCS)
2210                 dev->net->stats.rx_crc_errors++;
2211             else if (rx_cmd_a & (RX_CMD_A_LONG | RX_CMD_A_RUNT))
2212                 dev->net->stats.rx_frame_errors++;
2213         } else {
2214             /* MAX_SINGLE_PACKET_SIZE + 4(CRC) + 2(COE) + 4(Vlan) */
2215             if (unlikely(size > (MAX_SINGLE_PACKET_SIZE + ETH_HLEN + 12))) {
2216                 netif_dbg(dev, rx_err, dev->net,
2217                       "size err rx_cmd_a=0x%08x\n",
2218                       rx_cmd_a);
2219                 return 0;
2220             }
2221 
2222             /* last frame in this batch */
2223             if (skb->len == size) {
2224                 smsc75xx_rx_csum_offload(dev, skb, rx_cmd_a,
2225                     rx_cmd_b);
2226 
2227                 skb_trim(skb, skb->len - 4); /* remove fcs */
2228                 skb->truesize = size + sizeof(struct sk_buff);
2229 
2230                 return 1;
2231             }
2232 
2233             ax_skb = skb_clone(skb, GFP_ATOMIC);
2234             if (unlikely(!ax_skb)) {
2235                 netdev_warn(dev->net, "Error allocating skb\n");
2236                 return 0;
2237             }
2238 
2239             ax_skb->len = size;
2240             ax_skb->data = packet;
2241             skb_set_tail_pointer(ax_skb, size);
2242 
2243             smsc75xx_rx_csum_offload(dev, ax_skb, rx_cmd_a,
2244                 rx_cmd_b);
2245 
2246             skb_trim(ax_skb, ax_skb->len - 4); /* remove fcs */
2247             ax_skb->truesize = size + sizeof(struct sk_buff);
2248 
2249             usbnet_skb_return(dev, ax_skb);
2250         }
2251 
2252         skb_pull(skb, size);
2253 
2254         /* padding bytes before the next frame starts */
2255         if (skb->len)
2256             skb_pull(skb, align_count);
2257     }
2258 
2259     return 1;
2260 }
2261 
2262 static struct sk_buff *smsc75xx_tx_fixup(struct usbnet *dev,
2263                      struct sk_buff *skb, gfp_t flags)
2264 {
2265     u32 tx_cmd_a, tx_cmd_b;
2266     void *ptr;
2267 
2268     if (skb_cow_head(skb, SMSC75XX_TX_OVERHEAD)) {
2269         dev_kfree_skb_any(skb);
2270         return NULL;
2271     }
2272 
2273     tx_cmd_a = (u32)(skb->len & TX_CMD_A_LEN) | TX_CMD_A_FCS;
2274 
2275     if (skb->ip_summed == CHECKSUM_PARTIAL)
2276         tx_cmd_a |= TX_CMD_A_IPE | TX_CMD_A_TPE;
2277 
2278     if (skb_is_gso(skb)) {
2279         u16 mss = max(skb_shinfo(skb)->gso_size, TX_MSS_MIN);
2280         tx_cmd_b = (mss << TX_CMD_B_MSS_SHIFT) & TX_CMD_B_MSS;
2281 
2282         tx_cmd_a |= TX_CMD_A_LSO;
2283     } else {
2284         tx_cmd_b = 0;
2285     }
2286 
2287     ptr = skb_push(skb, 8);
2288     put_unaligned_le32(tx_cmd_a, ptr);
2289     put_unaligned_le32(tx_cmd_b, ptr + 4);
2290 
2291     return skb;
2292 }
2293 
2294 static int smsc75xx_manage_power(struct usbnet *dev, int on)
2295 {
2296     dev->intf->needs_remote_wakeup = on;
2297     return 0;
2298 }
2299 
2300 static const struct driver_info smsc75xx_info = {
2301     .description    = "smsc75xx USB 2.0 Gigabit Ethernet",
2302     .bind       = smsc75xx_bind,
2303     .unbind     = smsc75xx_unbind,
2304     .link_reset = smsc75xx_link_reset,
2305     .reset      = smsc75xx_reset,
2306     .rx_fixup   = smsc75xx_rx_fixup,
2307     .tx_fixup   = smsc75xx_tx_fixup,
2308     .status     = smsc75xx_status,
2309     .manage_power   = smsc75xx_manage_power,
2310     .flags      = FLAG_ETHER | FLAG_SEND_ZLP | FLAG_LINK_INTR,
2311 };
2312 
2313 static const struct usb_device_id products[] = {
2314     {
2315         /* SMSC7500 USB Gigabit Ethernet Device */
2316         USB_DEVICE(USB_VENDOR_ID_SMSC, USB_PRODUCT_ID_LAN7500),
2317         .driver_info = (unsigned long) &smsc75xx_info,
2318     },
2319     {
2320         /* SMSC7500 USB Gigabit Ethernet Device */
2321         USB_DEVICE(USB_VENDOR_ID_SMSC, USB_PRODUCT_ID_LAN7505),
2322         .driver_info = (unsigned long) &smsc75xx_info,
2323     },
2324     { },        /* END */
2325 };
2326 MODULE_DEVICE_TABLE(usb, products);
2327 
2328 static struct usb_driver smsc75xx_driver = {
2329     .name       = SMSC_CHIPNAME,
2330     .id_table   = products,
2331     .probe      = usbnet_probe,
2332     .suspend    = smsc75xx_suspend,
2333     .resume     = smsc75xx_resume,
2334     .reset_resume   = smsc75xx_resume,
2335     .disconnect = usbnet_disconnect,
2336     .disable_hub_initiated_lpm = 1,
2337     .supports_autosuspend = 1,
2338 };
2339 
2340 module_usb_driver(smsc75xx_driver);
2341 
2342 MODULE_AUTHOR("Nancy Lin");
2343 MODULE_AUTHOR("Steve Glendinning <steve.glendinning@shawell.net>");
2344 MODULE_DESCRIPTION("SMSC75XX USB 2.0 Gigabit Ethernet Devices");
2345 MODULE_LICENSE("GPL");
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