// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2015 Microchip Technology
 */
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/usb.h>
#include <linux/crc32.h>
#include <linux/signal.h>
#include <linux/slab.h>
#include <linux/if_vlan.h>
#include <linux/uaccess.h>
#include <linux/linkmode.h>
#include <linux/list.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/mdio.h>
#include <linux/phy.h>
#include <net/ip6_checksum.h>
#include <net/vxlan.h>
#include <linux/interrupt.h>
#include <linux/irqdomain.h>
#include <linux/irq.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/microchipphy.h>
#include <linux/phy_fixed.h>
#include <linux/of_mdio.h>
#include <linux/of_net.h>
#include "lan78xx.h"

#define DRIVER_AUTHOR   "WOOJUNG HUH <woojung.huh@microchip.com>"
#define DRIVER_DESC     "LAN78XX USB 3.0 Gigabit Ethernet Devices"
#define DRIVER_NAME     "lan78xx"

#define TX_TIMEOUT_JIFFIES              (5 * HZ)
#define THROTTLE_JIFFIES                (HZ / 8)
#define UNLINK_TIMEOUT_MS               3

#define RX_MAX_QUEUE_MEMORY             (60 * 1518)

#define SS_USB_PKT_SIZE                 (1024)
#define HS_USB_PKT_SIZE                 (512)
#define FS_USB_PKT_SIZE                 (64)

#define MAX_RX_FIFO_SIZE                (12 * 1024)
#define MAX_TX_FIFO_SIZE                (12 * 1024)

#define FLOW_THRESHOLD(n)               ((((n) + 511) / 512) & 0x7F)
#define FLOW_CTRL_THRESHOLD(on, off)    ((FLOW_THRESHOLD(on)  << 0) | \
                                         (FLOW_THRESHOLD(off) << 8))

/* Flow control turned on when Rx FIFO level rises above this level (bytes) */
#define FLOW_ON_SS                      9216
#define FLOW_ON_HS                      8704

/* Flow control turned off when Rx FIFO level falls below this level (bytes) */
#define FLOW_OFF_SS                     4096
#define FLOW_OFF_HS                     1024

#define DEFAULT_BURST_CAP_SIZE          (MAX_TX_FIFO_SIZE)
#define DEFAULT_BULK_IN_DELAY           (0x0800)
#define MAX_SINGLE_PACKET_SIZE          (9000)
#define DEFAULT_TX_CSUM_ENABLE          (true)
#define DEFAULT_RX_CSUM_ENABLE          (true)
#define DEFAULT_TSO_CSUM_ENABLE         (true)
#define DEFAULT_VLAN_FILTER_ENABLE      (true)
#define DEFAULT_VLAN_RX_OFFLOAD         (true)
#define TX_ALIGNMENT                    (4)
#define RXW_PADDING                     2

#define LAN78XX_USB_VENDOR_ID           (0x0424)
#define LAN7800_USB_PRODUCT_ID          (0x7800)
#define LAN7850_USB_PRODUCT_ID          (0x7850)
#define LAN7801_USB_PRODUCT_ID          (0x7801)
#define LAN78XX_EEPROM_MAGIC            (0x78A5)
#define LAN78XX_OTP_MAGIC               (0x78F3)
#define AT29M2AF_USB_VENDOR_ID          (0x07C9)
#define AT29M2AF_USB_PRODUCT_ID (0x0012)

#define MII_READ                        1
#define MII_WRITE                       0

#define EEPROM_INDICATOR                (0xA5)
#define EEPROM_MAC_OFFSET               (0x01)
#define MAX_EEPROM_SIZE                 512
#define OTP_INDICATOR_1                 (0xF3)
#define OTP_INDICATOR_2                 (0xF7)

#define WAKE_ALL                        (WAKE_PHY | WAKE_UCAST | \
                                         WAKE_MCAST | WAKE_BCAST | \
                                         WAKE_ARP | WAKE_MAGIC)

#define LAN78XX_NAPI_WEIGHT             64

#define TX_URB_NUM                      10
#define TX_SS_URB_NUM                   TX_URB_NUM
#define TX_HS_URB_NUM                   TX_URB_NUM
#define TX_FS_URB_NUM                   TX_URB_NUM

/* A single URB buffer must be large enough to hold a complete jumbo packet
 */
#define TX_SS_URB_SIZE                  (32 * 1024)
#define TX_HS_URB_SIZE                  (16 * 1024)
#define TX_FS_URB_SIZE                  (10 * 1024)

#define RX_SS_URB_NUM                   30
#define RX_HS_URB_NUM                   10
#define RX_FS_URB_NUM                   10
#define RX_SS_URB_SIZE                  TX_SS_URB_SIZE
#define RX_HS_URB_SIZE                  TX_HS_URB_SIZE
#define RX_FS_URB_SIZE                  TX_FS_URB_SIZE

#define SS_BURST_CAP_SIZE               RX_SS_URB_SIZE
#define SS_BULK_IN_DELAY                0x2000
#define HS_BURST_CAP_SIZE               RX_HS_URB_SIZE
#define HS_BULK_IN_DELAY                0x2000
#define FS_BURST_CAP_SIZE               RX_FS_URB_SIZE
#define FS_BULK_IN_DELAY                0x2000

#define TX_CMD_LEN                      8
#define TX_SKB_MIN_LEN                  (TX_CMD_LEN + ETH_HLEN)
#define LAN78XX_TSO_SIZE(dev)           ((dev)->tx_urb_size - TX_SKB_MIN_LEN)

#define RX_CMD_LEN                      10
#define RX_SKB_MIN_LEN                  (RX_CMD_LEN + ETH_HLEN)
#define RX_MAX_FRAME_LEN(mtu)           ((mtu) + ETH_HLEN + VLAN_HLEN)

/* USB related defines */
#define BULK_IN_PIPE                    1
#define BULK_OUT_PIPE                   2

/* default autosuspend delay (mSec)*/
#define DEFAULT_AUTOSUSPEND_DELAY       (10 * 1000)

/* statistic update interval (mSec) */
#define STAT_UPDATE_TIMER               (1 * 1000)

/* time to wait for MAC or FCT to stop (jiffies) */
#define HW_DISABLE_TIMEOUT              (HZ / 10)

/* time to wait between polling MAC or FCT state (ms) */
#define HW_DISABLE_DELAY_MS             1

/* defines interrupts from interrupt EP */
#define MAX_INT_EP                      (32)
#define INT_EP_INTEP                    (31)
#define INT_EP_OTP_WR_DONE              (28)
#define INT_EP_EEE_TX_LPI_START         (26)
#define INT_EP_EEE_TX_LPI_STOP          (25)
#define INT_EP_EEE_RX_LPI               (24)
#define INT_EP_MAC_RESET_TIMEOUT        (23)
#define INT_EP_RDFO                     (22)
#define INT_EP_TXE                      (21)
#define INT_EP_USB_STATUS               (20)
#define INT_EP_TX_DIS                   (19)
#define INT_EP_RX_DIS                   (18)
#define INT_EP_PHY                      (17)
#define INT_EP_DP                       (16)
#define INT_EP_MAC_ERR                  (15)
#define INT_EP_TDFU                     (14)
#define INT_EP_TDFO                     (13)
#define INT_EP_UTX                      (12)
#define INT_EP_GPIO_11                  (11)
#define INT_EP_GPIO_10                  (10)
#define INT_EP_GPIO_9                   (9)
#define INT_EP_GPIO_8                   (8)
#define INT_EP_GPIO_7                   (7)
#define INT_EP_GPIO_6                   (6)
#define INT_EP_GPIO_5                   (5)
#define INT_EP_GPIO_4                   (4)
#define INT_EP_GPIO_3                   (3)
#define INT_EP_GPIO_2                   (2)
#define INT_EP_GPIO_1                   (1)
#define INT_EP_GPIO_0                   (0)

static const char lan78xx_gstrings[][ETH_GSTRING_LEN] = {
        "RX FCS Errors",
        "RX Alignment Errors",
        "Rx Fragment Errors",
        "RX Jabber Errors",
        "RX Undersize Frame Errors",
        "RX Oversize Frame Errors",
        "RX Dropped Frames",
        "RX Unicast Byte Count",
        "RX Broadcast Byte Count",
        "RX Multicast Byte Count",
        "RX Unicast Frames",
        "RX Broadcast Frames",
        "RX Multicast Frames",
        "RX Pause Frames",
        "RX 64 Byte Frames",
        "RX 65 - 127 Byte Frames",
        "RX 128 - 255 Byte Frames",
        "RX 256 - 511 Bytes Frames",
        "RX 512 - 1023 Byte Frames",
        "RX 1024 - 1518 Byte Frames",
        "RX Greater 1518 Byte Frames",
        "EEE RX LPI Transitions",
        "EEE RX LPI Time",
        "TX FCS Errors",
        "TX Excess Deferral Errors",
        "TX Carrier Errors",
        "TX Bad Byte Count",
        "TX Single Collisions",
        "TX Multiple Collisions",
        "TX Excessive Collision",
        "TX Late Collisions",
        "TX Unicast Byte Count",
        "TX Broadcast Byte Count",
        "TX Multicast Byte Count",
        "TX Unicast Frames",
        "TX Broadcast Frames",
        "TX Multicast Frames",
        "TX Pause Frames",
        "TX 64 Byte Frames",
        "TX 65 - 127 Byte Frames",
        "TX 128 - 255 Byte Frames",
        "TX 256 - 511 Bytes Frames",
        "TX 512 - 1023 Byte Frames",
        "TX 1024 - 1518 Byte Frames",
        "TX Greater 1518 Byte Frames",
        "EEE TX LPI Transitions",
        "EEE TX LPI Time",
};

struct lan78xx_statstage {
        u32 rx_fcs_errors;
        u32 rx_alignment_errors;
        u32 rx_fragment_errors;
        u32 rx_jabber_errors;
        u32 rx_undersize_frame_errors;
        u32 rx_oversize_frame_errors;
        u32 rx_dropped_frames;
        u32 rx_unicast_byte_count;
        u32 rx_broadcast_byte_count;
        u32 rx_multicast_byte_count;
        u32 rx_unicast_frames;
        u32 rx_broadcast_frames;
        u32 rx_multicast_frames;
        u32 rx_pause_frames;
        u32 rx_64_byte_frames;
        u32 rx_65_127_byte_frames;
        u32 rx_128_255_byte_frames;
        u32 rx_256_511_bytes_frames;
        u32 rx_512_1023_byte_frames;
        u32 rx_1024_1518_byte_frames;
        u32 rx_greater_1518_byte_frames;
        u32 eee_rx_lpi_transitions;
        u32 eee_rx_lpi_time;
        u32 tx_fcs_errors;
        u32 tx_excess_deferral_errors;
        u32 tx_carrier_errors;
        u32 tx_bad_byte_count;
        u32 tx_single_collisions;
        u32 tx_multiple_collisions;
        u32 tx_excessive_collision;
        u32 tx_late_collisions;
        u32 tx_unicast_byte_count;
        u32 tx_broadcast_byte_count;
        u32 tx_multicast_byte_count;
        u32 tx_unicast_frames;
        u32 tx_broadcast_frames;
        u32 tx_multicast_frames;
        u32 tx_pause_frames;
        u32 tx_64_byte_frames;
        u32 tx_65_127_byte_frames;
        u32 tx_128_255_byte_frames;
        u32 tx_256_511_bytes_frames;
        u32 tx_512_1023_byte_frames;
        u32 tx_1024_1518_byte_frames;
        u32 tx_greater_1518_byte_frames;
        u32 eee_tx_lpi_transitions;
        u32 eee_tx_lpi_time;
};

struct lan78xx_statstage64 {
        u64 rx_fcs_errors;
        u64 rx_alignment_errors;
        u64 rx_fragment_errors;
        u64 rx_jabber_errors;
        u64 rx_undersize_frame_errors;
        u64 rx_oversize_frame_errors;
        u64 rx_dropped_frames;
        u64 rx_unicast_byte_count;
        u64 rx_broadcast_byte_count;
        u64 rx_multicast_byte_count;
        u64 rx_unicast_frames;
        u64 rx_broadcast_frames;
        u64 rx_multicast_frames;
        u64 rx_pause_frames;
        u64 rx_64_byte_frames;
        u64 rx_65_127_byte_frames;
        u64 rx_128_255_byte_frames;
        u64 rx_256_511_bytes_frames;
        u64 rx_512_1023_byte_frames;
        u64 rx_1024_1518_byte_frames;
        u64 rx_greater_1518_byte_frames;
        u64 eee_rx_lpi_transitions;
        u64 eee_rx_lpi_time;
        u64 tx_fcs_errors;
        u64 tx_excess_deferral_errors;
        u64 tx_carrier_errors;
        u64 tx_bad_byte_count;
        u64 tx_single_collisions;
        u64 tx_multiple_collisions;
        u64 tx_excessive_collision;
        u64 tx_late_collisions;
        u64 tx_unicast_byte_count;
        u64 tx_broadcast_byte_count;
        u64 tx_multicast_byte_count;
        u64 tx_unicast_frames;
        u64 tx_broadcast_frames;
        u64 tx_multicast_frames;
        u64 tx_pause_frames;
        u64 tx_64_byte_frames;
        u64 tx_65_127_byte_frames;
        u64 tx_128_255_byte_frames;
        u64 tx_256_511_bytes_frames;
        u64 tx_512_1023_byte_frames;
        u64 tx_1024_1518_byte_frames;
        u64 tx_greater_1518_byte_frames;
        u64 eee_tx_lpi_transitions;
        u64 eee_tx_lpi_time;
};

static u32 lan78xx_regs[] = {
        ID_REV,
        INT_STS,
        HW_CFG,
        PMT_CTL,
        E2P_CMD,
        E2P_DATA,
        USB_STATUS,
        VLAN_TYPE,
        MAC_CR,
        MAC_RX,
        MAC_TX,
        FLOW,
        ERR_STS,
        MII_ACC,
        MII_DATA,
        EEE_TX_LPI_REQ_DLY,
        EEE_TW_TX_SYS,
        EEE_TX_LPI_REM_DLY,
        WUCSR
};

#define PHY_REG_SIZE (32 * sizeof(u32))

struct lan78xx_net;

struct lan78xx_priv {
        struct lan78xx_net *dev;
        u32 rfe_ctl;
        u32 mchash_table[DP_SEL_VHF_HASH_LEN]; /* multicast hash table */
        u32 pfilter_table[NUM_OF_MAF][2]; /* perfect filter table */
        u32 vlan_table[DP_SEL_VHF_VLAN_LEN];
        struct mutex dataport_mutex; /* for dataport access */
        spinlock_t rfe_ctl_lock; /* for rfe register access */
        struct work_struct set_multicast;
        struct work_struct set_vlan;
        u32 wol;
};

enum skb_state {
        illegal = 0,
        tx_start,
        tx_done,
        rx_start,
        rx_done,
        rx_cleanup,
        unlink_start
};

struct skb_data {               /* skb->cb is one of these */
        struct urb *urb;
        struct lan78xx_net *dev;
        enum skb_state state;
        size_t length;
        int num_of_packet;
};

struct usb_context {
        struct usb_ctrlrequest req;
        struct lan78xx_net *dev;
};

#define EVENT_TX_HALT                   0
#define EVENT_RX_HALT                   1
#define EVENT_RX_MEMORY                 2
#define EVENT_STS_SPLIT                 3
#define EVENT_LINK_RESET                4
#define EVENT_RX_PAUSED                 5
#define EVENT_DEV_WAKING                6
#define EVENT_DEV_ASLEEP                7
#define EVENT_DEV_OPEN                  8
#define EVENT_STAT_UPDATE               9
#define EVENT_DEV_DISCONNECT            10

struct statstage {
        struct mutex                    access_lock;    /* for stats access */
        struct lan78xx_statstage        saved;
        struct lan78xx_statstage        rollover_count;
        struct lan78xx_statstage        rollover_max;
        struct lan78xx_statstage64      curr_stat;
};

struct irq_domain_data {
        struct irq_domain       *irqdomain;
        unsigned int            phyirq;
        struct irq_chip         *irqchip;
        irq_flow_handler_t      irq_handler;
        u32                     irqenable;
        struct mutex            irq_lock;               /* for irq bus access */
};

struct lan78xx_net {
        struct net_device       *net;
        struct usb_device       *udev;
        struct usb_interface    *intf;
        void                    *driver_priv;

        unsigned int            tx_pend_data_len;
        size_t                  n_tx_urbs;
        size_t                  n_rx_urbs;
        size_t                  tx_urb_size;
        size_t                  rx_urb_size;

        struct sk_buff_head     rxq_free;
        struct sk_buff_head     rxq;
        struct sk_buff_head     rxq_done;
        struct sk_buff_head     rxq_overflow;
        struct sk_buff_head     txq_free;
        struct sk_buff_head     txq;
        struct sk_buff_head     txq_pend;

        struct napi_struct      napi;

        struct delayed_work     wq;

        int                     msg_enable;

        struct urb              *urb_intr;
        struct usb_anchor       deferred;

        struct mutex            dev_mutex; /* serialise open/stop wrt suspend/resume */
        struct mutex            phy_mutex; /* for phy access */
        unsigned int            pipe_in, pipe_out, pipe_intr;

        unsigned int            bulk_in_delay;
        unsigned int            burst_cap;

        unsigned long           flags;

        wait_queue_head_t       *wait;
        unsigned char           suspend_count;

        unsigned int            maxpacket;
        struct timer_list       stat_monitor;

        unsigned long           data[5];

        int                     link_on;
        u8                      mdix_ctrl;

        u32                     chipid;
        u32                     chiprev;
        struct mii_bus          *mdiobus;
        phy_interface_t         interface;

        int                     fc_autoneg;
        u8                      fc_request_control;

        int                     delta;
        struct statstage        stats;

        struct irq_domain_data  domain_data;
};

/* define external phy id */
#define PHY_LAN8835                     (0x0007C130)
#define PHY_KSZ9031RNX                  (0x00221620)

/* use ethtool to change the level for any given device */
static int msg_level = -1;
module_param(msg_level, int, 0);
MODULE_PARM_DESC(msg_level, "Override default message level");

static struct sk_buff *lan78xx_get_buf(struct sk_buff_head *buf_pool)
{
        if (skb_queue_empty(buf_pool))
                return NULL;

        return skb_dequeue(buf_pool);
}

static void lan78xx_release_buf(struct sk_buff_head *buf_pool,
                                struct sk_buff *buf)
{
        buf->data = buf->head;
        skb_reset_tail_pointer(buf);

        buf->len = 0;
        buf->data_len = 0;

        skb_queue_tail(buf_pool, buf);
}

static void lan78xx_free_buf_pool(struct sk_buff_head *buf_pool)
{
        struct skb_data *entry;
        struct sk_buff *buf;

        while (!skb_queue_empty(buf_pool)) {
                buf = skb_dequeue(buf_pool);
                if (buf) {
                        entry = (struct skb_data *)buf->cb;
                        usb_free_urb(entry->urb);
                        dev_kfree_skb_any(buf);
                }
        }
}

static int lan78xx_alloc_buf_pool(struct sk_buff_head *buf_pool,
                                  size_t n_urbs, size_t urb_size,
                                  struct lan78xx_net *dev)
{
        struct skb_data *entry;
        struct sk_buff *buf;
        struct urb *urb;
        int i;

        skb_queue_head_init(buf_pool);

        for (i = 0; i < n_urbs; i++) {
                buf = alloc_skb(urb_size, GFP_ATOMIC);
                if (!buf)
                        goto error;

                if (skb_linearize(buf) != 0) {
                        dev_kfree_skb_any(buf);
                        goto error;
                }

                urb = usb_alloc_urb(0, GFP_ATOMIC);
                if (!urb) {
                        dev_kfree_skb_any(buf);
                        goto error;
                }

                entry = (struct skb_data *)buf->cb;
                entry->urb = urb;
                entry->dev = dev;
                entry->length = 0;
                entry->num_of_packet = 0;

                skb_queue_tail(buf_pool, buf);
        }

        return 0;

error:
        lan78xx_free_buf_pool(buf_pool);

        return -ENOMEM;
}

static struct sk_buff *lan78xx_get_rx_buf(struct lan78xx_net *dev)
{
        return lan78xx_get_buf(&dev->rxq_free);
}

static void lan78xx_release_rx_buf(struct lan78xx_net *dev,
                                   struct sk_buff *rx_buf)
{
        lan78xx_release_buf(&dev->rxq_free, rx_buf);
}

static void lan78xx_free_rx_resources(struct lan78xx_net *dev)
{
        lan78xx_free_buf_pool(&dev->rxq_free);
}

static int lan78xx_alloc_rx_resources(struct lan78xx_net *dev)
{
        return lan78xx_alloc_buf_pool(&dev->rxq_free,
                                      dev->n_rx_urbs, dev->rx_urb_size, dev);
}

static struct sk_buff *lan78xx_get_tx_buf(struct lan78xx_net *dev)
{
        return lan78xx_get_buf(&dev->txq_free);
}

static void lan78xx_release_tx_buf(struct lan78xx_net *dev,
                                   struct sk_buff *tx_buf)
{
        lan78xx_release_buf(&dev->txq_free, tx_buf);
}

static void lan78xx_free_tx_resources(struct lan78xx_net *dev)
{
        lan78xx_free_buf_pool(&dev->txq_free);
}

static int lan78xx_alloc_tx_resources(struct lan78xx_net *dev)
{
        return lan78xx_alloc_buf_pool(&dev->txq_free,
                                      dev->n_tx_urbs, dev->tx_urb_size, dev);
}

static int lan78xx_read_reg(struct lan78xx_net *dev, u32 index, u32 *data)
{
        u32 *buf;
        int ret;

        if (test_bit(EVENT_DEV_DISCONNECT, &dev->flags))
                return -ENODEV;

        buf = kmalloc(sizeof(u32), GFP_KERNEL);
        if (!buf)
                return -ENOMEM;

        ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
                              USB_VENDOR_REQUEST_READ_REGISTER,
                              USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                              0, index, buf, 4, USB_CTRL_GET_TIMEOUT);
        if (likely(ret >= 0)) {
                le32_to_cpus(buf);
                *data = *buf;
        } else if (net_ratelimit()) {
                netdev_warn(dev->net,
                            "Failed to read register index 0x%08x. ret = %d",
                            index, ret);
        }

        kfree(buf);

        return ret;
}

static int lan78xx_write_reg(struct lan78xx_net *dev, u32 index, u32 data)
{
        u32 *buf;
        int ret;

        if (test_bit(EVENT_DEV_DISCONNECT, &dev->flags))
                return -ENODEV;

        buf = kmalloc(sizeof(u32), GFP_KERNEL);
        if (!buf)
                return -ENOMEM;

        *buf = data;
        cpu_to_le32s(buf);

        ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
                              USB_VENDOR_REQUEST_WRITE_REGISTER,
                              USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                              0, index, buf, 4, USB_CTRL_SET_TIMEOUT);
        if (unlikely(ret < 0) &&
            net_ratelimit()) {
                netdev_warn(dev->net,
                            "Failed to write register index 0x%08x. ret = %d",
                            index, ret);
        }

        kfree(buf);

        return ret;
}

static int lan78xx_update_reg(struct lan78xx_net *dev, u32 reg, u32 mask,
                              u32 data)
{
        int ret;
        u32 buf;

        ret = lan78xx_read_reg(dev, reg, &buf);
        if (ret < 0)
                return ret;

        buf &= ~mask;
        buf |= (mask & data);

        ret = lan78xx_write_reg(dev, reg, buf);
        if (ret < 0)
                return ret;

        return 0;
}

static int lan78xx_read_stats(struct lan78xx_net *dev,
                              struct lan78xx_statstage *data)
{
        int ret = 0;
        int i;
        struct lan78xx_statstage *stats;
        u32 *src;
        u32 *dst;

        stats = kmalloc(sizeof(*stats), GFP_KERNEL);
        if (!stats)
                return -ENOMEM;

        ret = usb_control_msg(dev->udev,
                              usb_rcvctrlpipe(dev->udev, 0),
                              USB_VENDOR_REQUEST_GET_STATS,
                              USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
                              0,
                              0,
                              (void *)stats,
                              sizeof(*stats),
                              USB_CTRL_SET_TIMEOUT);
        if (likely(ret >= 0)) {
                src = (u32 *)stats;
                dst = (u32 *)data;
                for (i = 0; i < sizeof(*stats) / sizeof(u32); i++) {
                        le32_to_cpus(&src[i]);
                        dst[i] = src[i];
                }
        } else {
                netdev_warn(dev->net,
                            "Failed to read stat ret = %d", ret);
        }

        kfree(stats);

        return ret;
}

#define check_counter_rollover(struct1, dev_stats, member)              \
        do {                                                            \
                if ((struct1)->member < (dev_stats).saved.member)       \
                        (dev_stats).rollover_count.member++;            \
        } while (0)

static void lan78xx_check_stat_rollover(struct lan78xx_net *dev,
                                        struct lan78xx_statstage *stats)
{
        check_counter_rollover(stats, dev->stats, rx_fcs_errors);
        check_counter_rollover(stats, dev->stats, rx_alignment_errors);
        check_counter_rollover(stats, dev->stats, rx_fragment_errors);
        check_counter_rollover(stats, dev->stats, rx_jabber_errors);
        check_counter_rollover(stats, dev->stats, rx_undersize_frame_errors);
        check_counter_rollover(stats, dev->stats, rx_oversize_frame_errors);
        check_counter_rollover(stats, dev->stats, rx_dropped_frames);
        check_counter_rollover(stats, dev->stats, rx_unicast_byte_count);
        check_counter_rollover(stats, dev->stats, rx_broadcast_byte_count);
        check_counter_rollover(stats, dev->stats, rx_multicast_byte_count);
        check_counter_rollover(stats, dev->stats, rx_unicast_frames);
        check_counter_rollover(stats, dev->stats, rx_broadcast_frames);
        check_counter_rollover(stats, dev->stats, rx_multicast_frames);
        check_counter_rollover(stats, dev->stats, rx_pause_frames);
        check_counter_rollover(stats, dev->stats, rx_64_byte_frames);
        check_counter_rollover(stats, dev->stats, rx_65_127_byte_frames);
        check_counter_rollover(stats, dev->stats, rx_128_255_byte_frames);
        check_counter_rollover(stats, dev->stats, rx_256_511_bytes_frames);
        check_counter_rollover(stats, dev->stats, rx_512_1023_byte_frames);
        check_counter_rollover(stats, dev->stats, rx_1024_1518_byte_frames);
        check_counter_rollover(stats, dev->stats, rx_greater_1518_byte_frames);
        check_counter_rollover(stats, dev->stats, eee_rx_lpi_transitions);
        check_counter_rollover(stats, dev->stats, eee_rx_lpi_time);
        check_counter_rollover(stats, dev->stats, tx_fcs_errors);
        check_counter_rollover(stats, dev->stats, tx_excess_deferral_errors);
        check_counter_rollover(stats, dev->stats, tx_carrier_errors);
        check_counter_rollover(stats, dev->stats, tx_bad_byte_count);
        check_counter_rollover(stats, dev->stats, tx_single_collisions);
        check_counter_rollover(stats, dev->stats, tx_multiple_collisions);
        check_counter_rollover(stats, dev->stats, tx_excessive_collision);
        check_counter_rollover(stats, dev->stats, tx_late_collisions);
        check_counter_rollover(stats, dev->stats, tx_unicast_byte_count);
        check_counter_rollover(stats, dev->stats, tx_broadcast_byte_count);
        check_counter_rollover(stats, dev->stats, tx_multicast_byte_count);
        check_counter_rollover(stats, dev->stats, tx_unicast_frames);
        check_counter_rollover(stats, dev->stats, tx_broadcast_frames);
        check_counter_rollover(stats, dev->stats, tx_multicast_frames);
        check_counter_rollover(stats, dev->stats, tx_pause_frames);
        check_counter_rollover(stats, dev->stats, tx_64_byte_frames);
        check_counter_rollover(stats, dev->stats, tx_65_127_byte_frames);
        check_counter_rollover(stats, dev->stats, tx_128_255_byte_frames);
        check_counter_rollover(stats, dev->stats, tx_256_511_bytes_frames);
        check_counter_rollover(stats, dev->stats, tx_512_1023_byte_frames);
        check_counter_rollover(stats, dev->stats, tx_1024_1518_byte_frames);
        check_counter_rollover(stats, dev->stats, tx_greater_1518_byte_frames);
        check_counter_rollover(stats, dev->stats, eee_tx_lpi_transitions);
        check_counter_rollover(stats, dev->stats, eee_tx_lpi_time);

        memcpy(&dev->stats.saved, stats, sizeof(struct lan78xx_statstage));
}

static void lan78xx_update_stats(struct lan78xx_net *dev)
{
        u32 *p, *count, *max;
        u64 *data;
        int i;
        struct lan78xx_statstage lan78xx_stats;

        if (usb_autopm_get_interface(dev->intf) < 0)
                return;

        p = (u32 *)&lan78xx_stats;
        count = (u32 *)&dev->stats.rollover_count;
        max = (u32 *)&dev->stats.rollover_max;
        data = (u64 *)&dev->stats.curr_stat;

        mutex_lock(&dev->stats.access_lock);

        if (lan78xx_read_stats(dev, &lan78xx_stats) > 0)
                lan78xx_check_stat_rollover(dev, &lan78xx_stats);

        for (i = 0; i < (sizeof(lan78xx_stats) / (sizeof(u32))); i++)
                data[i] = (u64)p[i] + ((u64)count[i] * ((u64)max[i] + 1));

        mutex_unlock(&dev->stats.access_lock);

        usb_autopm_put_interface(dev->intf);
}

/* Loop until the read is completed with timeout called with phy_mutex held */
static int lan78xx_phy_wait_not_busy(struct lan78xx_net *dev)
{
        unsigned long start_time = jiffies;
        u32 val;
        int ret;

        do {
                ret = lan78xx_read_reg(dev, MII_ACC, &val);
                if (unlikely(ret < 0))
                        return -EIO;

                if (!(val & MII_ACC_MII_BUSY_))
                        return 0;
        } while (!time_after(jiffies, start_time + HZ));

        return -EIO;
}

static inline u32 mii_access(int id, int index, int read)
{
        u32 ret;

        ret = ((u32)id << MII_ACC_PHY_ADDR_SHIFT_) & MII_ACC_PHY_ADDR_MASK_;
        ret |= ((u32)index << MII_ACC_MIIRINDA_SHIFT_) & MII_ACC_MIIRINDA_MASK_;
        if (read)
                ret |= MII_ACC_MII_READ_;
        else
                ret |= MII_ACC_MII_WRITE_;
        ret |= MII_ACC_MII_BUSY_;

        return ret;
}

static int lan78xx_wait_eeprom(struct lan78xx_net *dev)
{
        unsigned long start_time = jiffies;
        u32 val;
        int ret;

        do {
                ret = lan78xx_read_reg(dev, E2P_CMD, &val);
                if (unlikely(ret < 0))
                        return -EIO;

                if (!(val & E2P_CMD_EPC_BUSY_) ||
                    (val & E2P_CMD_EPC_TIMEOUT_))
                        break;
                usleep_range(40, 100);
        } while (!time_after(jiffies, start_time + HZ));

        if (val & (E2P_CMD_EPC_TIMEOUT_ | E2P_CMD_EPC_BUSY_)) {
                netdev_warn(dev->net, "EEPROM read operation timeout");
                return -EIO;
        }

        return 0;
}

static int lan78xx_eeprom_confirm_not_busy(struct lan78xx_net *dev)
{
        unsigned long start_time = jiffies;
        u32 val;
        int ret;

        do {
                ret = lan78xx_read_reg(dev, E2P_CMD, &val);
                if (unlikely(ret < 0))
                        return -EIO;

                if (!(val & E2P_CMD_EPC_BUSY_))
                        return 0;

                usleep_range(40, 100);
        } while (!time_after(jiffies, start_time + HZ));

        netdev_warn(dev->net, "EEPROM is busy");
        return -EIO;
}

static int lan78xx_read_raw_eeprom(struct lan78xx_net *dev, u32 offset,
                                   u32 length, u8 *data)
{
        u32 val;
        u32 saved;
        int i, ret;
        int retval;

        /* depends on chip, some EEPROM pins are muxed with LED function.
         * disable & restore LED function to access EEPROM.
         */
        ret = lan78xx_read_reg(dev, HW_CFG, &val);
        saved = val;
        if (dev->chipid == ID_REV_CHIP_ID_7800_) {
                val &= ~(HW_CFG_LED1_EN_ | HW_CFG_LED0_EN_);
                ret = lan78xx_write_reg(dev, HW_CFG, val);
        }

        retval = lan78xx_eeprom_confirm_not_busy(dev);
        if (retval)
                return retval;

        for (i = 0; i < length; i++) {
                val = E2P_CMD_EPC_BUSY_ | E2P_CMD_EPC_CMD_READ_;
                val |= (offset & E2P_CMD_EPC_ADDR_MASK_);
                ret = lan78xx_write_reg(dev, E2P_CMD, val);
                if (unlikely(ret < 0)) {
                        retval = -EIO;
                        goto exit;
                }

                retval = lan78xx_wait_eeprom(dev);
                if (retval < 0)
                        goto exit;

                ret = lan78xx_read_reg(dev, E2P_DATA, &val);
                if (unlikely(ret < 0)) {
                        retval = -EIO;
                        goto exit;
                }

                data[i] = val & 0xFF;
                offset++;
        }

        retval = 0;
exit:
        if (dev->chipid == ID_REV_CHIP_ID_7800_)
                ret = lan78xx_write_reg(dev, HW_CFG, saved);

        return retval;
}

static int lan78xx_read_eeprom(struct lan78xx_net *dev, u32 offset,
                               u32 length, u8 *data)
{
        u8 sig;
        int ret;

        ret = lan78xx_read_raw_eeprom(dev, 0, 1, &sig);
        if ((ret == 0) && (sig == EEPROM_INDICATOR))
                ret = lan78xx_read_raw_eeprom(dev, offset, length, data);
        else
                ret = -EINVAL;

        return ret;
}

static int lan78xx_write_raw_eeprom(struct lan78xx_net *dev, u32 offset,
                                    u32 length, u8 *data)
{
        u32 val;
        u32 saved;
        int i, ret;
        int retval;

        /* depends on chip, some EEPROM pins are muxed with LED function.
         * disable & restore LED function to access EEPROM.
         */
        ret = lan78xx_read_reg(dev, HW_CFG, &val);
        saved = val;
        if (dev->chipid == ID_REV_CHIP_ID_7800_) {
                val &= ~(HW_CFG_LED1_EN_ | HW_CFG_LED0_EN_);
                ret = lan78xx_write_reg(dev, HW_CFG, val);
        }

        retval = lan78xx_eeprom_confirm_not_busy(dev);
        if (retval)
                goto exit;

        /* Issue write/erase enable command */
        val = E2P_CMD_EPC_BUSY_ | E2P_CMD_EPC_CMD_EWEN_;
        ret = lan78xx_write_reg(dev, E2P_CMD, val);
        if (unlikely(ret < 0)) {
                retval = -EIO;
                goto exit;
        }

        retval = lan78xx_wait_eeprom(dev);

        if (retval < 0)
                goto exit;

        for (i = 0; i < length; i++) {
                /* Fill data register */
                val = data[i];
                ret = lan78xx_write_reg(dev, E2P_DATA, val);
                if (ret < 0) {
                        retval = -EIO;
                        goto exit;
                }

                /* Send "write" command */
                val = E2P_CMD_EPC_BUSY_ | E2P_CMD_EPC_CMD_WRITE_;
                val |= (offset & E2P_CMD_EPC_ADDR_MASK_);
                ret = lan78xx_write_reg(dev, E2P_CMD, val);
                if (ret < 0) {
                        retval = -EIO;
                        goto exit;
                }

                retval = lan78xx_wait_eeprom(dev);
                if (retval < 0)
                        goto exit;

                offset++;
        }

        retval = 0;
exit:
        if (dev->chipid == ID_REV_CHIP_ID_7800_)
                ret = lan78xx_write_reg(dev, HW_CFG, saved);

        return retval;
}

static int lan78xx_read_raw_otp(struct lan78xx_net *dev, u32 offset,
                                u32 length, u8 *data)
{
        int i;
        u32 buf;
        unsigned long timeout;

        lan78xx_read_reg(dev, OTP_PWR_DN, &buf);

        if (buf & OTP_PWR_DN_PWRDN_N_) {
                /* clear it and wait to be cleared */
                lan78xx_write_reg(dev, OTP_PWR_DN, 0);

                timeout = jiffies + HZ;
                do {
                        usleep_range(1, 10);
                        lan78xx_read_reg(dev, OTP_PWR_DN, &buf);
                        if (time_after(jiffies, timeout)) {
                                netdev_warn(dev->net,
                                            "timeout on OTP_PWR_DN");
                                return -EIO;
                        }
                } while (buf & OTP_PWR_DN_PWRDN_N_);
        }

        for (i = 0; i < length; i++) {
                lan78xx_write_reg(dev, OTP_ADDR1,
                                  ((offset + i) >> 8) & OTP_ADDR1_15_11);
                lan78xx_write_reg(dev, OTP_ADDR2,
                                  ((offset + i) & OTP_ADDR2_10_3));

                lan78xx_write_reg(dev, OTP_FUNC_CMD, OTP_FUNC_CMD_READ_);
                lan78xx_write_reg(dev, OTP_CMD_GO, OTP_CMD_GO_GO_);

                timeout = jiffies + HZ;
                do {
                        udelay(1);
                        lan78xx_read_reg(dev, OTP_STATUS, &buf);
                        if (time_after(jiffies, timeout)) {
                                netdev_warn(dev->net,
                                            "timeout on OTP_STATUS");
                                return -EIO;
                        }
                } while (buf & OTP_STATUS_BUSY_);

                lan78xx_read_reg(dev, OTP_RD_DATA, &buf);

                data[i] = (u8)(buf & 0xFF);
        }

        return 0;
}

static int lan78xx_write_raw_otp(struct lan78xx_net *dev, u32 offset,
                                 u32 length, u8 *data)
{
        int i;
        u32 buf;
        unsigned long timeout;

        lan78xx_read_reg(dev, OTP_PWR_DN, &buf);

        if (buf & OTP_PWR_DN_PWRDN_N_) {
                /* clear it and wait to be cleared */
                lan78xx_write_reg(dev, OTP_PWR_DN, 0);

                timeout = jiffies + HZ;
                do {
                        udelay(1);
                        lan78xx_read_reg(dev, OTP_PWR_DN, &buf);
                        if (time_after(jiffies, timeout)) {
                                netdev_warn(dev->net,
                                            "timeout on OTP_PWR_DN completion");
                                return -EIO;
                        }
                } while (buf & OTP_PWR_DN_PWRDN_N_);
        }

        /* set to BYTE program mode */
        lan78xx_write_reg(dev, OTP_PRGM_MODE, OTP_PRGM_MODE_BYTE_);

        for (i = 0; i < length; i++) {
                lan78xx_write_reg(dev, OTP_ADDR1,
                                  ((offset + i) >> 8) & OTP_ADDR1_15_11);
                lan78xx_write_reg(dev, OTP_ADDR2,
                                  ((offset + i) & OTP_ADDR2_10_3));
                lan78xx_write_reg(dev, OTP_PRGM_DATA, data[i]);
                lan78xx_write_reg(dev, OTP_TST_CMD, OTP_TST_CMD_PRGVRFY_);
                lan78xx_write_reg(dev, OTP_CMD_GO, OTP_CMD_GO_GO_);

                timeout = jiffies + HZ;
                do {
                        udelay(1);
                        lan78xx_read_reg(dev, OTP_STATUS, &buf);
                        if (time_after(jiffies, timeout)) {
                                netdev_warn(dev->net,
                                            "Timeout on OTP_STATUS completion");
                                return -EIO;
                        }
                } while (buf & OTP_STATUS_BUSY_);
        }

        return 0;
}

static int lan78xx_read_otp(struct lan78xx_net *dev, u32 offset,
                            u32 length, u8 *data)
{
        u8 sig;
        int ret;

        ret = lan78xx_read_raw_otp(dev, 0, 1, &sig);

        if (ret == 0) {
                if (sig == OTP_INDICATOR_2)
                        offset += 0x100;
                else if (sig != OTP_INDICATOR_1)
                        ret = -EINVAL;
                if (!ret)
                        ret = lan78xx_read_raw_otp(dev, offset, length, data);
        }

        return ret;
}

static int lan78xx_dataport_wait_not_busy(struct lan78xx_net *dev)
{
        int i, ret;

        for (i = 0; i < 100; i++) {
                u32 dp_sel;

                ret = lan78xx_read_reg(dev, DP_SEL, &dp_sel);
                if (unlikely(ret < 0))
                        return -EIO;

                if (dp_sel & DP_SEL_DPRDY_)
                        return 0;

                usleep_range(40, 100);
        }

        netdev_warn(dev->net, "%s timed out", __func__);

        return -EIO;
}

static int lan78xx_dataport_write(struct lan78xx_net *dev, u32 ram_select,
                                  u32 addr, u32 length, u32 *buf)
{
        struct lan78xx_priv *pdata = (struct lan78xx_priv *)(dev->data[0]);
        u32 dp_sel;
        int i, ret;

        if (usb_autopm_get_interface(dev->intf) < 0)
                return 0;

        mutex_lock(&pdata->dataport_mutex);

        ret = lan78xx_dataport_wait_not_busy(dev);
        if (ret < 0)
                goto done;

        ret = lan78xx_read_reg(dev, DP_SEL, &dp_sel);

        dp_sel &= ~DP_SEL_RSEL_MASK_;
        dp_sel |= ram_select;
        ret = lan78xx_write_reg(dev, DP_SEL, dp_sel);

        for (i = 0; i < length; i++) {
                ret = lan78xx_write_reg(dev, DP_ADDR, addr + i);

                ret = lan78xx_write_reg(dev, DP_DATA, buf[i]);

                ret = lan78xx_write_reg(dev, DP_CMD, DP_CMD_WRITE_);

                ret = lan78xx_dataport_wait_not_busy(dev);
                if (ret < 0)
                        goto done;
        }

done:
        mutex_unlock(&pdata->dataport_mutex);
        usb_autopm_put_interface(dev->intf);

        return ret;
}

static void lan78xx_set_addr_filter(struct lan78xx_priv *pdata,
                                    int index, u8 addr[ETH_ALEN])
{
        u32 temp;

        if ((pdata) && (index > 0) && (index < NUM_OF_MAF)) {
                temp = addr[3];
                temp = addr[2] | (temp << 8);
                temp = addr[1] | (temp << 8);
                temp = addr[0] | (temp << 8);
                pdata->pfilter_table[index][1] = temp;
                temp = addr[5];
                temp = addr[4] | (temp << 8);
                temp |= MAF_HI_VALID_ | MAF_HI_TYPE_DST_;
                pdata->pfilter_table[index][0] = temp;
        }
}

/* returns hash bit number for given MAC address */
static inline u32 lan78xx_hash(char addr[ETH_ALEN])
{
        return (ether_crc(ETH_ALEN, addr) >> 23) & 0x1ff;
}

static void lan78xx_deferred_multicast_write(struct work_struct *param)
{
        struct lan78xx_priv *pdata =
                        container_of(param, struct lan78xx_priv, set_multicast);
        struct lan78xx_net *dev = pdata->dev;
        int i;

        netif_dbg(dev, drv, dev->net, "deferred multicast write 0x%08x\n",
                  pdata->rfe_ctl);

        lan78xx_dataport_write(dev, DP_SEL_RSEL_VLAN_DA_, DP_SEL_VHF_VLAN_LEN,
                               DP_SEL_VHF_HASH_LEN, pdata->mchash_table);

        for (i = 1; i < NUM_OF_MAF; i++) {
                lan78xx_write_reg(dev, MAF_HI(i), 0);
                lan78xx_write_reg(dev, MAF_LO(i),
                                  pdata->pfilter_table[i][1]);
                lan78xx_write_reg(dev, MAF_HI(i),
                                  pdata->pfilter_table[i][0]);
        }

        lan78xx_write_reg(dev, RFE_CTL, pdata->rfe_ctl);
}

static void lan78xx_set_multicast(struct net_device *netdev)
{
        struct lan78xx_net *dev = netdev_priv(netdev);
        struct lan78xx_priv *pdata = (struct lan78xx_priv *)(dev->data[0]);
        unsigned long flags;
        int i;

        spin_lock_irqsave(&pdata->rfe_ctl_lock, flags);

        pdata->rfe_ctl &= ~(RFE_CTL_UCAST_EN_ | RFE_CTL_MCAST_EN_ |
                            RFE_CTL_DA_PERFECT_ | RFE_CTL_MCAST_HASH_);

        for (i = 0; i < DP_SEL_VHF_HASH_LEN; i++)
                pdata->mchash_table[i] = 0;

        /* pfilter_table[0] has own HW address */
        for (i = 1; i < NUM_OF_MAF; i++) {
                pdata->pfilter_table[i][0] = 0;
                pdata->pfilter_table[i][1] = 0;
        }

        pdata->rfe_ctl |= RFE_CTL_BCAST_EN_;

        if (dev->net->flags & IFF_PROMISC) {
                netif_dbg(dev, drv, dev->net, "promiscuous mode enabled");
                pdata->rfe_ctl |= RFE_CTL_MCAST_EN_ | RFE_CTL_UCAST_EN_;
        } else {
                if (dev->net->flags & IFF_ALLMULTI) {
                        netif_dbg(dev, drv, dev->net,
                                  "receive all multicast enabled");
                        pdata->rfe_ctl |= RFE_CTL_MCAST_EN_;
                }
        }

        if (netdev_mc_count(dev->net)) {
                struct netdev_hw_addr *ha;
                int i;

                netif_dbg(dev, drv, dev->net, "receive multicast hash filter");

                pdata->rfe_ctl |= RFE_CTL_DA_PERFECT_;

                i = 1;
                netdev_for_each_mc_addr(ha, netdev) {
                        /* set first 32 into Perfect Filter */
                        if (i < 33) {
                                lan78xx_set_addr_filter(pdata, i, ha->addr);
                        } else {
                                u32 bitnum = lan78xx_hash(ha->addr);

                                pdata->mchash_table[bitnum / 32] |=
                                                        (1 << (bitnum % 32));
                                pdata->rfe_ctl |= RFE_CTL_MCAST_HASH_;
                        }
                        i++;
                }
        }

        spin_unlock_irqrestore(&pdata->rfe_ctl_lock, flags);

        /* defer register writes to a sleepable context */
        schedule_work(&pdata->set_multicast);
}

static int lan78xx_update_flowcontrol(struct lan78xx_net *dev, u8 duplex,
                                      u16 lcladv, u16 rmtadv)
{
        u32 flow = 0, fct_flow = 0;
        u8 cap;

        if (dev->fc_autoneg)
                cap = mii_resolve_flowctrl_fdx(lcladv, rmtadv);
        else
                cap = dev->fc_request_control;

        if (cap & FLOW_CTRL_TX)
                flow |= (FLOW_CR_TX_FCEN_ | 0xFFFF);

        if (cap & FLOW_CTRL_RX)
                flow |= FLOW_CR_RX_FCEN_;

        if (dev->udev->speed == USB_SPEED_SUPER)
                fct_flow = FLOW_CTRL_THRESHOLD(FLOW_ON_SS, FLOW_OFF_SS);
        else if (dev->udev->speed == USB_SPEED_HIGH)
                fct_flow = FLOW_CTRL_THRESHOLD(FLOW_ON_HS, FLOW_OFF_HS);

        netif_dbg(dev, link, dev->net, "rx pause %s, tx pause %s",
                  (cap & FLOW_CTRL_RX ? "enabled" : "disabled"),
                  (cap & FLOW_CTRL_TX ? "enabled" : "disabled"));

        lan78xx_write_reg(dev, FCT_FLOW, fct_flow);

        /* threshold value should be set before enabling flow */
        lan78xx_write_reg(dev, FLOW, flow);

        return 0;
}

static void lan78xx_rx_urb_submit_all(struct lan78xx_net *dev);

static int lan78xx_mac_reset(struct lan78xx_net *dev)
{
        unsigned long start_time = jiffies;
        u32 val;
        int ret;

        mutex_lock(&dev->phy_mutex);

        /* Resetting the device while there is activity on the MDIO
         * bus can result in the MAC interface locking up and not
         * completing register access transactions.
         */
        ret = lan78xx_phy_wait_not_busy(dev);
        if (ret < 0)
                goto done;

        ret = lan78xx_read_reg(dev, MAC_CR, &val);
        if (ret < 0)
                goto done;

        val |= MAC_CR_RST_;
        ret = lan78xx_write_reg(dev, MAC_CR, val);
        if (ret < 0)
                goto done;

        /* Wait for the reset to complete before allowing any further
         * MAC register accesses otherwise the MAC may lock up.
         */
        do {
                ret = lan78xx_read_reg(dev, MAC_CR, &val);
                if (ret < 0)
                        goto done;

                if (!(val & MAC_CR_RST_)) {
                        ret = 0;
                        goto done;
                }
        } while (!time_after(jiffies, start_time + HZ));

        ret = -ETIMEDOUT;
done:
        mutex_unlock(&dev->phy_mutex);

        return ret;
}

static int lan78xx_link_reset(struct lan78xx_net *dev)
{
        struct phy_device *phydev = dev->net->phydev;
        struct ethtool_link_ksettings ecmd;
        int ladv, radv, ret, link;
        u32 buf;

        /* clear LAN78xx interrupt status */
        ret = lan78xx_write_reg(dev, INT_STS, INT_STS_PHY_INT_);
        if (unlikely(ret < 0))
                return ret;

        mutex_lock(&phydev->lock);
        phy_read_status(phydev);
        link = phydev->link;
        mutex_unlock(&phydev->lock);

        if (!link && dev->link_on) {
                dev->link_on = false;

                /* reset MAC */
                ret = lan78xx_mac_reset(dev);
                if (ret < 0)
                        return ret;

                del_timer(&dev->stat_monitor);
        } else if (link && !dev->link_on) {
                dev->link_on = true;

                phy_ethtool_ksettings_get(phydev, &ecmd);

                if (dev->udev->speed == USB_SPEED_SUPER) {
                        if (ecmd.base.speed == 1000) {
                                /* disable U2 */
                                ret = lan78xx_read_reg(dev, USB_CFG1, &buf);
                                if (ret < 0)
                                        return ret;
                                buf &= ~USB_CFG1_DEV_U2_INIT_EN_;
                                ret = lan78xx_write_reg(dev, USB_CFG1, buf);
                                if (ret < 0)
                                        return ret;
                                /* enable U1 */
                                ret = lan78xx_read_reg(dev, USB_CFG1, &buf);
                                if (ret < 0)
                                        return ret;
                                buf |= USB_CFG1_DEV_U1_INIT_EN_;
                                ret = lan78xx_write_reg(dev, USB_CFG1, buf);
                                if (ret < 0)
                                        return ret;
                        } else {
                                /* enable U1 & U2 */
                                ret = lan78xx_read_reg(dev, USB_CFG1, &buf);
                                if (ret < 0)
                                        return ret;
                                buf |= USB_CFG1_DEV_U2_INIT_EN_;
                                buf |= USB_CFG1_DEV_U1_INIT_EN_;
                                ret = lan78xx_write_reg(dev, USB_CFG1, buf);
                                if (ret < 0)
                                        return ret;
                        }
                }

                ladv = phy_read(phydev, MII_ADVERTISE);
                if (ladv < 0)
                        return ladv;

                radv = phy_read(phydev, MII_LPA);
                if (radv < 0)
                        return radv;

                netif_dbg(dev, link, dev->net,
                          "speed: %u duplex: %d anadv: 0x%04x anlpa: 0x%04x",
                          ecmd.base.speed, ecmd.base.duplex, ladv, radv);

                ret = lan78xx_update_flowcontrol(dev, ecmd.base.duplex, ladv,
                                                 radv);
                if (ret < 0)
                        return ret;

                if (!timer_pending(&dev->stat_monitor)) {
                        dev->delta = 1;
                        mod_timer(&dev->stat_monitor,
                                  jiffies + STAT_UPDATE_TIMER);
                }

                lan78xx_rx_urb_submit_all(dev);

                napi_schedule(&dev->napi);
        }

        return 0;
}

/* some work can't be done in tasklets, so we use keventd
 *
 * NOTE:  annoying asymmetry:  if it's active, schedule_work() fails,
 * but tasklet_schedule() doesn't.      hope the failure is rare.
 */
static void lan78xx_defer_kevent(struct lan78xx_net *dev, int work)
{
        set_bit(work, &dev->flags);
        if (!schedule_delayed_work(&dev->wq, 0))
                netdev_err(dev->net, "kevent %d may have been dropped\n", work);
}

static void lan78xx_status(struct lan78xx_net *dev, struct urb *urb)
{
        u32 intdata;

        if (urb->actual_length != 4) {
                netdev_warn(dev->net,
                            "unexpected urb length %d", urb->actual_length);
                return;
        }

        intdata = get_unaligned_le32(urb->transfer_buffer);

        if (intdata & INT_ENP_PHY_INT) {
                netif_dbg(dev, link, dev->net, "PHY INTR: 0x%08x\n", intdata);
                lan78xx_defer_kevent(dev, EVENT_LINK_RESET);

                if (dev->domain_data.phyirq > 0)
                        generic_handle_irq_safe(dev->domain_data.phyirq);
        } else {
                netdev_warn(dev->net,
                            "unexpected interrupt: 0x%08x\n", intdata);
        }
}

static int lan78xx_ethtool_get_eeprom_len(struct net_device *netdev)
{
        return MAX_EEPROM_SIZE;
}

static int lan78xx_ethtool_get_eeprom(struct net_device *netdev,
                                      struct ethtool_eeprom *ee, u8 *data)
{
        struct lan78xx_net *dev = netdev_priv(netdev);
        int ret;

        ret = usb_autopm_get_interface(dev->intf);
        if (ret)
                return ret;

        ee->magic = LAN78XX_EEPROM_MAGIC;

        ret = lan78xx_read_raw_eeprom(dev, ee->offset, ee->len, data);

        usb_autopm_put_interface(dev->intf);

        return ret;
}

static int lan78xx_ethtool_set_eeprom(struct net_device *netdev,
                                      struct ethtool_eeprom *ee, u8 *data)
{
        struct lan78xx_net *dev = netdev_priv(netdev);
        int ret;

        ret = usb_autopm_get_interface(dev->intf);
        if (ret)
                return ret;

        /* Invalid EEPROM_INDICATOR at offset zero will result in a failure
         * to load data from EEPROM
         */
        if (ee->magic == LAN78XX_EEPROM_MAGIC)
                ret = lan78xx_write_raw_eeprom(dev, ee->offset, ee->len, data);
        else if ((ee->magic == LAN78XX_OTP_MAGIC) &&
                 (ee->offset == 0) &&
                 (ee->len == 512) &&
                 (data[0] == OTP_INDICATOR_1))
                ret = lan78xx_write_raw_otp(dev, ee->offset, ee->len, data);

        usb_autopm_put_interface(dev->intf);

        return ret;
}

static void lan78xx_get_strings(struct net_device *netdev, u32 stringset,
                                u8 *data)
{
        if (stringset == ETH_SS_STATS)
                memcpy(data, lan78xx_gstrings, sizeof(lan78xx_gstrings));
}

static int lan78xx_get_sset_count(struct net_device *netdev, int sset)
{
        if (sset == ETH_SS_STATS)
                return ARRAY_SIZE(lan78xx_gstrings);
        else
                return -EOPNOTSUPP;
}

static void lan78xx_get_stats(struct net_device *netdev,
                              struct ethtool_stats *stats, u64 *data)
{
        struct lan78xx_net *dev = netdev_priv(netdev);

        lan78xx_update_stats(dev);

        mutex_lock(&dev->stats.access_lock);
        memcpy(data, &dev->stats.curr_stat, sizeof(dev->stats.curr_stat));
        mutex_unlock(&dev->stats.access_lock);
}

static void lan78xx_get_wol(struct net_device *netdev,
                            struct ethtool_wolinfo *wol)
{
        struct lan78xx_net *dev = netdev_priv(netdev);
        int ret;
        u32 buf;
        struct lan78xx_priv *pdata = (struct lan78xx_priv *)(dev->data[0]);

        if (usb_autopm_get_interface(dev->intf) < 0)
                return;

        ret = lan78xx_read_reg(dev, USB_CFG0, &buf);
        if (unlikely(ret < 0)) {
                wol->supported = 0;
                wol->wolopts = 0;
        } else {
                if (buf & USB_CFG_RMT_WKP_) {
                        wol->supported = WAKE_ALL;
                        wol->wolopts = pdata->wol;
                } else {
                        wol->supported = 0;
                        wol->wolopts = 0;
                }
        }

        usb_autopm_put_interface(dev->intf);
}

static int lan78xx_set_wol(struct net_device *netdev,
                           struct ethtool_wolinfo *wol)
{
        struct lan78xx_net *dev = netdev_priv(netdev);
        struct lan78xx_priv *pdata = (struct lan78xx_priv *)(dev->data[0]);
        int ret;

        ret = usb_autopm_get_interface(dev->intf);
        if (ret < 0)
                return ret;

        if (wol->wolopts & ~WAKE_ALL)
                return -EINVAL;

        pdata->wol = wol->wolopts;

        device_set_wakeup_enable(&dev->udev->dev, (bool)wol->wolopts);

        phy_ethtool_set_wol(netdev->phydev, wol);

        usb_autopm_put_interface(dev->intf);

        return ret;
}

static int lan78xx_get_eee(struct net_device *net, struct ethtool_eee *edata)
{
        struct lan78xx_net *dev = netdev_priv(net);
        struct phy_device *phydev = net->phydev;
        int ret;
        u32 buf;

        ret = usb_autopm_get_interface(dev->intf);
        if (ret < 0)
                return ret;

        ret = phy_ethtool_get_eee(phydev, edata);
        if (ret < 0)
                goto exit;

        ret = lan78xx_read_reg(dev, MAC_CR, &buf);
        if (buf & MAC_CR_EEE_EN_) {
                edata->eee_enabled = true;
                edata->eee_active = !!(edata->advertised &
                                       edata->lp_advertised);
                edata->tx_lpi_enabled = true;
                /* EEE_TX_LPI_REQ_DLY & tx_lpi_timer are same uSec unit */
                ret = lan78xx_read_reg(dev, EEE_TX_LPI_REQ_DLY, &buf);
                edata->tx_lpi_timer = buf;
        } else {
                edata->eee_enabled = false;
                edata->eee_active = false;
                edata->tx_lpi_enabled = false;
                edata->tx_lpi_timer = 0;
        }

        ret = 0;
exit:
        usb_autopm_put_interface(dev->intf);

        return ret;
}

static int lan78xx_set_eee(struct net_device *net, struct ethtool_eee *edata)
{
        struct lan78xx_net *dev = netdev_priv(net);
        int ret;
        u32 buf;

        ret = usb_autopm_get_interface(dev->intf);
        if (ret < 0)
                return ret;

        if (edata->eee_enabled) {
                ret = lan78xx_read_reg(dev, MAC_CR, &buf);
                buf |= MAC_CR_EEE_EN_;
                ret = lan78xx_write_reg(dev, MAC_CR, buf);

                phy_ethtool_set_eee(net->phydev, edata);

                buf = (u32)edata->tx_lpi_timer;
                ret = lan78xx_write_reg(dev, EEE_TX_LPI_REQ_DLY, buf);
        } else {
                ret = lan78xx_read_reg(dev, MAC_CR, &buf);
                buf &= ~MAC_CR_EEE_EN_;
                ret = lan78xx_write_reg(dev, MAC_CR, buf);
        }

        usb_autopm_put_interface(dev->intf);

        return 0;
}

static u32 lan78xx_get_link(struct net_device *net)
{
        u32 link;

        mutex_lock(&net->phydev->lock);
        phy_read_status(net->phydev);
        link = net->phydev->link;
        mutex_unlock(&net->phydev->lock);

        return link;
}

static void lan78xx_get_drvinfo(struct net_device *net,
                                struct ethtool_drvinfo *info)
{
        struct lan78xx_net *dev = netdev_priv(net);

        strncpy(info->driver, DRIVER_NAME, sizeof(info->driver));
        usb_make_path(dev->udev, info->bus_info, sizeof(info->bus_info));
}

static u32 lan78xx_get_msglevel(struct net_device *net)
{
        struct lan78xx_net *dev = netdev_priv(net);

        return dev->msg_enable;
}

static void lan78xx_set_msglevel(struct net_device *net, u32 level)
{
        struct lan78xx_net *dev = netdev_priv(net);

        dev->msg_enable = level;
}

static int lan78xx_get_link_ksettings(struct net_device *net,
                                      struct ethtool_link_ksettings *cmd)
{
        struct lan78xx_net *dev = netdev_priv(net);
        struct phy_device *phydev = net->phydev;
        int ret;

        ret = usb_autopm_get_interface(dev->intf);
        if (ret < 0)
                return ret;

        phy_ethtool_ksettings_get(phydev, cmd);

        usb_autopm_put_interface(dev->intf);

        return ret;
}

static int lan78xx_set_link_ksettings(struct net_device *net,
                                      const struct ethtool_link_ksettings *cmd)
{
        struct lan78xx_net *dev = netdev_priv(net);
        struct phy_device *phydev = net->phydev;
        int ret = 0;
        int temp;

        ret = usb_autopm_get_interface(dev->intf);
        if (ret < 0)
                return ret;

        /* change speed & duplex */
        ret = phy_ethtool_ksettings_set(phydev, cmd);

        if (!cmd->base.autoneg) {
                /* force link down */
                temp = phy_read(phydev, MII_BMCR);
                phy_write(phydev, MII_BMCR, temp | BMCR_LOOPBACK);
                mdelay(1);
                phy_write(phydev, MII_BMCR, temp);
        }

        usb_autopm_put_interface(dev->intf);

        return ret;
}

static void lan78xx_get_pause(struct net_device *net,
                              struct ethtool_pauseparam *pause)
{
        struct lan78xx_net *dev = netdev_priv(net);
        struct phy_device *phydev = net->phydev;
        struct ethtool_link_ksettings ecmd;

        phy_ethtool_ksettings_get(phydev, &ecmd);

        pause->autoneg = dev->fc_autoneg;

        if (dev->fc_request_control & FLOW_CTRL_TX)
                pause->tx_pause = 1;

        if (dev->fc_request_control & FLOW_CTRL_RX)
                pause->rx_pause = 1;
}

static int lan78xx_set_pause(struct net_device *net,
                             struct ethtool_pauseparam *pause)
{
        struct lan78xx_net *dev = netdev_priv(net);
        struct phy_device *phydev = net->phydev;
        struct ethtool_link_ksettings ecmd;
        int ret;

        phy_ethtool_ksettings_get(phydev, &ecmd);

        if (pause->autoneg && !ecmd.base.autoneg) {
                ret = -EINVAL;
                goto exit;
        }

        dev->fc_request_control = 0;
        if (pause->rx_pause)
                dev->fc_request_control |= FLOW_CTRL_RX;

        if (pause->tx_pause)
                dev->fc_request_control |= FLOW_CTRL_TX;

        if (ecmd.base.autoneg) {
                __ETHTOOL_DECLARE_LINK_MODE_MASK(fc) = { 0, };
                u32 mii_adv;

                linkmode_clear_bit(ETHTOOL_LINK_MODE_Pause_BIT,
                                   ecmd.link_modes.advertising);
                linkmode_clear_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
                                   ecmd.link_modes.advertising);
                mii_adv = (u32)mii_advertise_flowctrl(dev->fc_request_control);
                mii_adv_to_linkmode_adv_t(fc, mii_adv);
                linkmode_or(ecmd.link_modes.advertising, fc,
                            ecmd.link_modes.advertising);

                phy_ethtool_ksettings_set(phydev, &ecmd);
        }

        dev->fc_autoneg = pause->autoneg;

        ret = 0;
exit:
        return ret;
}

static int lan78xx_get_regs_len(struct net_device *netdev)
{
        if (!netdev->phydev)
                return (sizeof(lan78xx_regs));
        else
                return (sizeof(lan78xx_regs) + PHY_REG_SIZE);
}

static void
lan78xx_get_regs(struct net_device *netdev, struct ethtool_regs *regs,
                 void *buf)
{
        u32 *data = buf;
        int i, j;
        struct lan78xx_net *dev = netdev_priv(netdev);

        /* Read Device/MAC registers */
        for (i = 0; i < ARRAY_SIZE(lan78xx_regs); i++)
                lan78xx_read_reg(dev, lan78xx_regs[i], &data[i]);

        if (!netdev->phydev)
                return;

        /* Read PHY registers */
        for (j = 0; j < 32; i++, j++)
                data[i] = phy_read(netdev->phydev, j);
}

static const struct ethtool_ops lan78xx_ethtool_ops = {
        .get_link       = lan78xx_get_link,
        .nway_reset     = phy_ethtool_nway_reset,
        .get_drvinfo    = lan78xx_get_drvinfo,
        .get_msglevel   = lan78xx_get_msglevel,
        .set_msglevel   = lan78xx_set_msglevel,
        .get_eeprom_len = lan78xx_ethtool_get_eeprom_len,
        .get_eeprom     = lan78xx_ethtool_get_eeprom,
        .set_eeprom     = lan78xx_ethtool_set_eeprom,
        .get_ethtool_stats = lan78xx_get_stats,
        .get_sset_count = lan78xx_get_sset_count,
        .get_strings    = lan78xx_get_strings,
        .get_wol        = lan78xx_get_wol,
        .set_wol        = lan78xx_set_wol,
        .get_ts_info    = ethtool_op_get_ts_info,
        .get_eee        = lan78xx_get_eee,
        .set_eee        = lan78xx_set_eee,
        .get_pauseparam = lan78xx_get_pause,
        .set_pauseparam = lan78xx_set_pause,
        .get_link_ksettings = lan78xx_get_link_ksettings,
        .set_link_ksettings = lan78xx_set_link_ksettings,
        .get_regs_len   = lan78xx_get_regs_len,
        .get_regs       = lan78xx_get_regs,
};

static void lan78xx_init_mac_address(struct lan78xx_net *dev)
{
        u32 addr_lo, addr_hi;
        u8 addr[6];

        lan78xx_read_reg(dev, RX_ADDRL, &addr_lo);
        lan78xx_read_reg(dev, RX_ADDRH, &addr_hi);

        addr[0] = addr_lo & 0xFF;
        addr[1] = (addr_lo >> 8) & 0xFF;
        addr[2] = (addr_lo >> 16) & 0xFF;
        addr[3] = (addr_lo >> 24) & 0xFF;
        addr[4] = addr_hi & 0xFF;
        addr[5] = (addr_hi >> 8) & 0xFF;

        if (!is_valid_ether_addr(addr)) {
                if (!eth_platform_get_mac_address(&dev->udev->dev, addr)) {
                        /* valid address present in Device Tree */
                        netif_dbg(dev, ifup, dev->net,
                                  "MAC address read from Device Tree");
                } else if (((lan78xx_read_eeprom(dev, EEPROM_MAC_OFFSET,
                                                 ETH_ALEN, addr) == 0) ||
                            (lan78xx_read_otp(dev, EEPROM_MAC_OFFSET,
                                              ETH_ALEN, addr) == 0)) &&
                           is_valid_ether_addr(addr)) {
                        /* eeprom values are valid so use them */
                        netif_dbg(dev, ifup, dev->net,
                                  "MAC address read from EEPROM");
                } else {
                        /* generate random MAC */
                        eth_random_addr(addr);
                        netif_dbg(dev, ifup, dev->net,
                                  "MAC address set to random addr");
                }

                addr_lo = addr[0] | (addr[1] << 8) |
                          (addr[2] << 16) | (addr[3] << 24);
                addr_hi = addr[4] | (addr[5] << 8);

                lan78xx_write_reg(dev, RX_ADDRL, addr_lo);
                lan78xx_write_reg(dev, RX_ADDRH, addr_hi);
        }

        lan78xx_write_reg(dev, MAF_LO(0), addr_lo);
        lan78xx_write_reg(dev, MAF_HI(0), addr_hi | MAF_HI_VALID_);

        eth_hw_addr_set(dev->net, addr);
}

/* MDIO read and write wrappers for phylib */
static int lan78xx_mdiobus_read(struct mii_bus *bus, int phy_id, int idx)
{
        struct lan78xx_net *dev = bus->priv;
        u32 val, addr;
        int ret;

        ret = usb_autopm_get_interface(dev->intf);
        if (ret < 0)

                return ret;

        mutex_lock(&dev->phy_mutex);

        /* confirm MII not busy */
        ret = lan78xx_phy_wait_not_busy(dev);
        if (ret < 0)
                goto done;

        /* set the address, index & direction (read from PHY) */
        addr = mii_access(phy_id, idx, MII_READ);
        ret = lan78xx_write_reg(dev, MII_ACC, addr);

        ret = lan78xx_phy_wait_not_busy(dev);
        if (ret < 0)
                goto done;

        ret = lan78xx_read_reg(dev, MII_DATA, &val);

        ret = (int)(val & 0xFFFF);

done:
        mutex_unlock(&dev->phy_mutex);
        usb_autopm_put_interface(dev->intf);

        return ret;
}

static int lan78xx_mdiobus_write(struct mii_bus *bus, int phy_id, int idx,
                                 u16 regval)
{
        struct lan78xx_net *dev = bus->priv;
        u32 val, addr;
        int ret;

        ret = usb_autopm_get_interface(dev->intf);
        if (ret < 0)
                return ret;

        mutex_lock(&dev->phy_mutex);

        /* confirm MII not busy */
        ret = lan78xx_phy_wait_not_busy(dev);
        if (ret < 0)
                goto done;

        val = (u32)regval;
        ret = lan78xx_write_reg(dev, MII_DATA, val);

        /* set the address, index & direction (write to PHY) */
        addr = mii_access(phy_id, idx, MII_WRITE);
        ret = lan78xx_write_reg(dev, MII_ACC, addr);

        ret = lan78xx_phy_wait_not_busy(dev);
        if (ret < 0)
                goto done;

done:
        mutex_unlock(&dev->phy_mutex);
        usb_autopm_put_interface(dev->intf);
        return 0;
}

static int lan78xx_mdio_init(struct lan78xx_net *dev)
{
        struct device_node *node;
        int ret;

        dev->mdiobus = mdiobus_alloc();
        if (!dev->mdiobus) {
                netdev_err(dev->net, "can't allocate MDIO bus\n");
                return -ENOMEM;
        }

        dev->mdiobus->priv = (void *)dev;
        dev->mdiobus->read = lan78xx_mdiobus_read;
        dev->mdiobus->write = lan78xx_mdiobus_write;
        dev->mdiobus->name = "lan78xx-mdiobus";
        dev->mdiobus->parent = &dev->udev->dev;

        snprintf(dev->mdiobus->id, MII_BUS_ID_SIZE, "usb-%03d:%03d",
                 dev->udev->bus->busnum, dev->udev->devnum);

        switch (dev->chipid) {
        case ID_REV_CHIP_ID_7800_:
        case ID_REV_CHIP_ID_7850_:
                /* set to internal PHY id */
                dev->mdiobus->phy_mask = ~(1 << 1);
                break;
        case ID_REV_CHIP_ID_7801_:
                /* scan thru PHYAD[2..0] */
                dev->mdiobus->phy_mask = ~(0xFF);
                break;
        }

        node = of_get_child_by_name(dev->udev->dev.of_node, "mdio");
        ret = of_mdiobus_register(dev->mdiobus, node);
        of_node_put(node);
        if (ret) {
                netdev_err(dev->net, "can't register MDIO bus\n");
                goto exit1;
        }

        netdev_dbg(dev->net, "registered mdiobus bus %s\n", dev->mdiobus->id);
        return 0;
exit1:
        mdiobus_free(dev->mdiobus);
        return ret;
}

static void lan78xx_remove_mdio(struct lan78xx_net *dev)
{
        mdiobus_unregister(dev->mdiobus);
        mdiobus_free(dev->mdiobus);
}

static void lan78xx_link_status_change(struct net_device *net)
{
        struct phy_device *phydev = net->phydev;
        int temp;

        /* At forced 100 F/H mode, chip may fail to set mode correctly
         * when cable is switched between long(~50+m) and short one.
         * As workaround, set to 10 before setting to 100
         * at forced 100 F/H mode.
         */
        if (!phydev->autoneg && (phydev->speed == 100)) {
                /* disable phy interrupt */
                temp = phy_read(phydev, LAN88XX_INT_MASK);
                temp &= ~LAN88XX_INT_MASK_MDINTPIN_EN_;
                phy_write(phydev, LAN88XX_INT_MASK, temp);

                temp = phy_read(phydev, MII_BMCR);
                temp &= ~(BMCR_SPEED100 | BMCR_SPEED1000);
                phy_write(phydev, MII_BMCR, temp); /* set to 10 first */
                temp |= BMCR_SPEED100;
                phy_write(phydev, MII_BMCR, temp); /* set to 100 later */

                /* clear pending interrupt generated while workaround */
                temp = phy_read(phydev, LAN88XX_INT_STS);

                /* enable phy interrupt back */
                temp = phy_read(phydev, LAN88XX_INT_MASK);
                temp |= LAN88XX_INT_MASK_MDINTPIN_EN_;
                phy_write(phydev, LAN88XX_INT_MASK, temp);
        }
}

static int irq_map(struct irq_domain *d, unsigned int irq,
                   irq_hw_number_t hwirq)
{
        struct irq_domain_data *data = d->host_data;

        irq_set_chip_data(irq, data);
        irq_set_chip_and_handler(irq, data->irqchip, data->irq_handler);
        irq_set_noprobe(irq);

        return 0;
}

static void irq_unmap(struct irq_domain *d, unsigned int irq)
{
        irq_set_chip_and_handler(irq, NULL, NULL);
        irq_set_chip_data(irq, NULL);
}

static const struct irq_domain_ops chip_domain_ops = {
        .map    = irq_map,
        .unmap  = irq_unmap,
};

static void lan78xx_irq_mask(struct irq_data *irqd)
{
        struct irq_domain_data *data = irq_data_get_irq_chip_data(irqd);

        data->irqenable &= ~BIT(irqd_to_hwirq(irqd));
}

static void lan78xx_irq_unmask(struct irq_data *irqd)
{
        struct irq_domain_data *data = irq_data_get_irq_chip_data(irqd);

        data->irqenable |= BIT(irqd_to_hwirq(irqd));
}

static void lan78xx_irq_bus_lock(struct irq_data *irqd)
{
        struct irq_domain_data *data = irq_data_get_irq_chip_data(irqd);

        mutex_lock(&data->irq_lock);
}

static void lan78xx_irq_bus_sync_unlock(struct irq_data *irqd)
{
        struct irq_domain_data *data = irq_data_get_irq_chip_data(irqd);
        struct lan78xx_net *dev =
                        container_of(data, struct lan78xx_net, domain_data);
        u32 buf;

        /* call register access here because irq_bus_lock & irq_bus_sync_unlock
         * are only two callbacks executed in non-atomic contex.
         */
        lan78xx_read_reg(dev, INT_EP_CTL, &buf);
        if (buf != data->irqenable)
                lan78xx_write_reg(dev, INT_EP_CTL, data->irqenable);

        mutex_unlock(&data->irq_lock);
}

static struct irq_chip lan78xx_irqchip = {
        .name                   = "lan78xx-irqs",
        .irq_mask               = lan78xx_irq_mask,
        .irq_unmask             = lan78xx_irq_unmask,
        .irq_bus_lock           = lan78xx_irq_bus_lock,
        .irq_bus_sync_unlock    = lan78xx_irq_bus_sync_unlock,
};

static int lan78xx_setup_irq_domain(struct lan78xx_net *dev)
{
        struct device_node *of_node;
        struct irq_domain *irqdomain;
        unsigned int irqmap = 0;
        u32 buf;
        int ret = 0;

        of_node = dev->udev->dev.parent->of_node;

        mutex_init(&dev->domain_data.irq_lock);

        lan78xx_read_reg(dev, INT_EP_CTL, &buf);
        dev->domain_data.irqenable = buf;

        dev->domain_data.irqchip = &lan78xx_irqchip;
        dev->domain_data.irq_handler = handle_simple_irq;

        irqdomain = irq_domain_add_simple(of_node, MAX_INT_EP, 0,
                                          &chip_domain_ops, &dev->domain_data);
        if (irqdomain) {
                /* create mapping for PHY interrupt */
                irqmap = irq_create_mapping(irqdomain, INT_EP_PHY);
                if (!irqmap) {
                        irq_domain_remove(irqdomain);

                        irqdomain = NULL;
                        ret = -EINVAL;
                }
        } else {
                ret = -EINVAL;
        }

        dev->domain_data.irqdomain = irqdomain;
        dev->domain_data.phyirq = irqmap;

        return ret;
}

static void lan78xx_remove_irq_domain(struct lan78xx_net *dev)
{
        if (dev->domain_data.phyirq > 0) {
                irq_dispose_mapping(dev->domain_data.phyirq);

                if (dev->domain_data.irqdomain)
                        irq_domain_remove(dev->domain_data.irqdomain);
        }
        dev->domain_data.phyirq = 0;
        dev->domain_data.irqdomain = NULL;
}

static int lan8835_fixup(struct phy_device *phydev)
{
        int buf;
        struct lan78xx_net *dev = netdev_priv(phydev->attached_dev);

        /* LED2/PME_N/IRQ_N/RGMII_ID pin to IRQ_N mode */
        buf = phy_read_mmd(phydev, MDIO_MMD_PCS, 0x8010);
        buf &= ~0x1800;
        buf |= 0x0800;
        phy_write_mmd(phydev, MDIO_MMD_PCS, 0x8010, buf);

        /* RGMII MAC TXC Delay Enable */
        lan78xx_write_reg(dev, MAC_RGMII_ID,
                          MAC_RGMII_ID_TXC_DELAY_EN_);

        /* RGMII TX DLL Tune Adjust */
        lan78xx_write_reg(dev, RGMII_TX_BYP_DLL, 0x3D00);

        dev->interface = PHY_INTERFACE_MODE_RGMII_TXID;

        return 1;
}

static int ksz9031rnx_fixup(struct phy_device *phydev)
{
        struct lan78xx_net *dev = netdev_priv(phydev->attached_dev);

        /* Micrel9301RNX PHY configuration */
        /* RGMII Control Signal Pad Skew */
        phy_write_mmd(phydev, MDIO_MMD_WIS, 4, 0x0077);
        /* RGMII RX Data Pad Skew */
        phy_write_mmd(phydev, MDIO_MMD_WIS, 5, 0x7777);
        /* RGMII RX Clock Pad Skew */
        phy_write_mmd(phydev, MDIO_MMD_WIS, 8, 0x1FF);

        dev->interface = PHY_INTERFACE_MODE_RGMII_RXID;

        return 1;
}

static struct phy_device *lan7801_phy_init(struct lan78xx_net *dev)
{
        u32 buf;
        int ret;
        struct fixed_phy_status fphy_status = {
                .link = 1,
                .speed = SPEED_1000,
                .duplex = DUPLEX_FULL,
        };
        struct phy_device *phydev;

        phydev = phy_find_first(dev->mdiobus);
        if (!phydev) {
                netdev_dbg(dev->net, "PHY Not Found!! Registering Fixed PHY\n");
                phydev = fixed_phy_register(PHY_POLL, &fphy_status, NULL);
                if (IS_ERR(phydev)) {
                        netdev_err(dev->net, "No PHY/fixed_PHY found\n");
                        return NULL;
                }
                netdev_dbg(dev->net, "Registered FIXED PHY\n");
                dev->interface = PHY_INTERFACE_MODE_RGMII;
                ret = lan78xx_write_reg(dev, MAC_RGMII_ID,
                                        MAC_RGMII_ID_TXC_DELAY_EN_);
                ret = lan78xx_write_reg(dev, RGMII_TX_BYP_DLL, 0x3D00);
                ret = lan78xx_read_reg(dev, HW_CFG, &buf);
                buf |= HW_CFG_CLK125_EN_;
                buf |= HW_CFG_REFCLK25_EN_;
                ret = lan78xx_write_reg(dev, HW_CFG, buf);
        } else {
                if (!phydev->drv) {
                        netdev_err(dev->net, "no PHY driver found\n");
                        return NULL;
                }
                dev->interface = PHY_INTERFACE_MODE_RGMII;
                /* external PHY fixup for KSZ9031RNX */
                ret = phy_register_fixup_for_uid(PHY_KSZ9031RNX, 0xfffffff0,
                                                 ksz9031rnx_fixup);
                if (ret < 0) {
                        netdev_err(dev->net, "Failed to register fixup for PHY_KSZ9031RNX\n");
                        return NULL;
                }
                /* external PHY fixup for LAN8835 */
                ret = phy_register_fixup_for_uid(PHY_LAN8835, 0xfffffff0,
                                                 lan8835_fixup);
                if (ret < 0) {
                        netdev_err(dev->net, "Failed to register fixup for PHY_LAN8835\n");
                        return NULL;
                }
                /* add more external PHY fixup here if needed */

                phydev->is_internal = false;
        }
        return phydev;
}

static int lan78xx_phy_init(struct lan78xx_net *dev)
{
        __ETHTOOL_DECLARE_LINK_MODE_MASK(fc) = { 0, };
        int ret;
        u32 mii_adv;
        struct phy_device *phydev;

        switch (dev->chipid) {
        case ID_REV_CHIP_ID_7801_:
                phydev = lan7801_phy_init(dev);
                if (!phydev) {
                        netdev_err(dev->net, "lan7801: PHY Init Failed");
                        return -EIO;
                }
                break;

        case ID_REV_CHIP_ID_7800_:
        case ID_REV_CHIP_ID_7850_:
                phydev = phy_find_first(dev->mdiobus);
                if (!phydev) {
                        netdev_err(dev->net, "no PHY found\n");
                        return -EIO;
                }
                phydev->is_internal = true;
                dev->interface = PHY_INTERFACE_MODE_GMII;
                break;

        default:
                netdev_err(dev->net, "Unknown CHIP ID found\n");
                return -EIO;
        }

        /* if phyirq is not set, use polling mode in phylib */
        if (dev->domain_data.phyirq > 0)
                phydev->irq = dev->domain_data.phyirq;
        else
                phydev->irq = PHY_POLL;
        netdev_dbg(dev->net, "phydev->irq = %d\n", phydev->irq);

        /* set to AUTOMDIX */
        phydev->mdix = ETH_TP_MDI_AUTO;

        ret = phy_connect_direct(dev->net, phydev,
                                 lan78xx_link_status_change,
                                 dev->interface);
        if (ret) {
                netdev_err(dev->net, "can't attach PHY to %s\n",
                           dev->mdiobus->id);
                if (dev->chipid == ID_REV_CHIP_ID_7801_) {
                        if (phy_is_pseudo_fixed_link(phydev)) {
                                fixed_phy_unregister(phydev);
                        } else {
                                phy_unregister_fixup_for_uid(PHY_KSZ9031RNX,
                                                             0xfffffff0);
                                phy_unregister_fixup_for_uid(PHY_LAN8835,
                                                             0xfffffff0);
                        }
                }
                return -EIO;
        }

        /* MAC doesn't support 1000T Half */
        phy_remove_link_mode(phydev, ETHTOOL_LINK_MODE_1000baseT_Half_BIT);

        /* support both flow controls */
        dev->fc_request_control = (FLOW_CTRL_RX | FLOW_CTRL_TX);
        linkmode_clear_bit(ETHTOOL_LINK_MODE_Pause_BIT,
                           phydev->advertising);
        linkmode_clear_bit(ETHTOOL_LINK_MODE_Asym_Pause_BIT,
                           phydev->advertising);
        mii_adv = (u32)mii_advertise_flowctrl(dev->fc_request_control);
        mii_adv_to_linkmode_adv_t(fc, mii_adv);
        linkmode_or(phydev->advertising, fc, phydev->advertising);

        if (phydev->mdio.dev.of_node) {
                u32 reg;
                int len;

                len = of_property_count_elems_of_size(phydev->mdio.dev.of_node,
                                                      "microchip,led-modes",
                                                      sizeof(u32));
                if (len >= 0) {
                        /* Ensure the appropriate LEDs are enabled */
                        lan78xx_read_reg(dev, HW_CFG, &reg);
                        reg &= ~(HW_CFG_LED0_EN_ |
                                 HW_CFG_LED1_EN_ |
                                 HW_CFG_LED2_EN_ |
                                 HW_CFG_LED3_EN_);
                        reg |= (len > 0) * HW_CFG_LED0_EN_ |
                                (len > 1) * HW_CFG_LED1_EN_ |
                                (len > 2) * HW_CFG_LED2_EN_ |
                                (len > 3) * HW_CFG_LED3_EN_;
                        lan78xx_write_reg(dev, HW_CFG, reg);
                }
        }

        genphy_config_aneg(phydev);

        dev->fc_autoneg = phydev->autoneg;

        return 0;
}

static int lan78xx_set_rx_max_frame_length(struct lan78xx_net *dev, int size)
{
        u32 buf;
        bool rxenabled;

        lan78xx_read_reg(dev, MAC_RX, &buf);

        rxenabled = ((buf & MAC_RX_RXEN_) != 0);

        if (rxenabled) {
                buf &= ~MAC_RX_RXEN_;
                lan78xx_write_reg(dev, MAC_RX, buf);
        }

        /* add 4 to size for FCS */
        buf &= ~MAC_RX_MAX_SIZE_MASK_;
        buf |= (((size + 4) << MAC_RX_MAX_SIZE_SHIFT_) & MAC_RX_MAX_SIZE_MASK_);

        lan78xx_write_reg(dev, MAC_RX, buf);

        if (rxenabled) {
                buf |= MAC_RX_RXEN_;
                lan78xx_write_reg(dev, MAC_RX, buf);
        }

        return 0;
}

static int unlink_urbs(struct lan78xx_net *dev, struct sk_buff_head *q)
{
        struct sk_buff *skb;
        unsigned long flags;
        int count = 0;

        spin_lock_irqsave(&q->lock, flags);
        while (!skb_queue_empty(q)) {
                struct skb_data *entry;
                struct urb *urb;
                int ret;

                skb_queue_walk(q, skb) {
                        entry = (struct skb_data *)skb->cb;
                        if (entry->state != unlink_start)
                                goto found;
                }
                break;
found:
                entry->state = unlink_start;
                urb = entry->urb;

                /* Get reference count of the URB to avoid it to be
                 * freed during usb_unlink_urb, which may trigger
                 * use-after-free problem inside usb_unlink_urb since
                 * usb_unlink_urb is always racing with .complete
                 * handler(include defer_bh).
                 */
                usb_get_urb(urb);
                spin_unlock_irqrestore(&q->lock, flags);
                /* during some PM-driven resume scenarios,
                 * these (async) unlinks complete immediately
                 */
                ret = usb_unlink_urb(urb);
                if (ret != -EINPROGRESS && ret != 0)
                        netdev_dbg(dev->net, "unlink urb err, %d\n", ret);
                else
                        count++;
                usb_put_urb(urb);
                spin_lock_irqsave(&q->lock, flags);
        }
        spin_unlock_irqrestore(&q->lock, flags);
        return count;
}

static int lan78xx_change_mtu(struct net_device *netdev, int new_mtu)
{
        struct lan78xx_net *dev = netdev_priv(netdev);
        int max_frame_len = RX_MAX_FRAME_LEN(new_mtu);
        int ret;

        /* no second zero-length packet read wanted after mtu-sized packets */
        if ((max_frame_len % dev->maxpacket) == 0)
                return -EDOM;

        ret = usb_autopm_get_interface(dev->intf);
        if (ret < 0)
                return ret;

        ret = lan78xx_set_rx_max_frame_length(dev, max_frame_len);
        if (!ret)
                netdev->mtu = new_mtu;

        usb_autopm_put_interface(dev->intf);

        return ret;
}

static int lan78xx_set_mac_addr(struct net_device *netdev, void *p)
{
        struct lan78xx_net *dev = netdev_priv(netdev);
        struct sockaddr *addr = p;
        u32 addr_lo, addr_hi;

        if (netif_running(netdev))
                return -EBUSY;

        if (!is_valid_ether_addr(addr->sa_data))
                return -EADDRNOTAVAIL;

        eth_hw_addr_set(netdev, addr->sa_data);

        addr_lo = netdev->dev_addr[0] |
                  netdev->dev_addr[1] << 8 |
                  netdev->dev_addr[2] << 16 |
                  netdev->dev_addr[3] << 24;
        addr_hi = netdev->dev_addr[4] |
                  netdev->dev_addr[5] << 8;

        lan78xx_write_reg(dev, RX_ADDRL, addr_lo);
        lan78xx_write_reg(dev, RX_ADDRH, addr_hi);

        /* Added to support MAC address changes */
        lan78xx_write_reg(dev, MAF_LO(0), addr_lo);
        lan78xx_write_reg(dev, MAF_HI(0), addr_hi | MAF_HI_VALID_);

        return 0;
}

/* Enable or disable Rx checksum offload engine */
static int lan78xx_set_features(struct net_device *netdev,
                                netdev_features_t features)
{
        struct lan78xx_net *dev = netdev_priv(netdev);
        struct lan78xx_priv *pdata = (struct lan78xx_priv *)(dev->data[0]);
        unsigned long flags;

        spin_lock_irqsave(&pdata->rfe_ctl_lock, flags);

        if (features & NETIF_F_RXCSUM) {
                pdata->rfe_ctl |= RFE_CTL_TCPUDP_COE_ | RFE_CTL_IP_COE_;
                pdata->rfe_ctl |= RFE_CTL_ICMP_COE_ | RFE_CTL_IGMP_COE_;
        } else {
                pdata->rfe_ctl &= ~(RFE_CTL_TCPUDP_COE_ | RFE_CTL_IP_COE_);
                pdata->rfe_ctl &= ~(RFE_CTL_ICMP_COE_ | RFE_CTL_IGMP_COE_);
        }

        if (features & NETIF_F_HW_VLAN_CTAG_RX)
                pdata->rfe_ctl |= RFE_CTL_VLAN_STRIP_;
        else
                pdata->rfe_ctl &= ~RFE_CTL_VLAN_STRIP_;

        if (features & NETIF_F_HW_VLAN_CTAG_FILTER)
                pdata->rfe_ctl |= RFE_CTL_VLAN_FILTER_;
        else
                pdata->rfe_ctl &= ~RFE_CTL_VLAN_FILTER_;

        spin_unlock_irqrestore(&pdata->rfe_ctl_lock, flags);

        lan78xx_write_reg(dev, RFE_CTL, pdata->rfe_ctl);

        return 0;
}

static void lan78xx_deferred_vlan_write(struct work_struct *param)
{
        struct lan78xx_priv *pdata =
                        container_of(param, struct lan78xx_priv, set_vlan);
        struct lan78xx_net *dev = pdata->dev;

        lan78xx_dataport_write(dev, DP_SEL_RSEL_VLAN_DA_, 0,
                               DP_SEL_VHF_VLAN_LEN, pdata->vlan_table);
}

static int lan78xx_vlan_rx_add_vid(struct net_device *netdev,
                                   __be16 proto, u16 vid)
{
        struct lan78xx_net *dev = netdev_priv(netdev);
        struct lan78xx_priv *pdata = (struct lan78xx_priv *)(dev->data[0]);
        u16 vid_bit_index;
        u16 vid_dword_index;

        vid_dword_index = (vid >> 5) & 0x7F;
        vid_bit_index = vid & 0x1F;

        pdata->vlan_table[vid_dword_index] |= (1 << vid_bit_index);

        /* defer register writes to a sleepable context */
        schedule_work(&pdata->set_vlan);

        return 0;
}

static int lan78xx_vlan_rx_kill_vid(struct net_device *netdev,
                                    __be16 proto, u16 vid)
{
        struct lan78xx_net *dev = netdev_priv(netdev);
        struct lan78xx_priv *pdata = (struct lan78xx_priv *)(dev->data[0]);
        u16 vid_bit_index;
        u16 vid_dword_index;

        vid_dword_index = (vid >> 5) & 0x7F;
        vid_bit_index = vid & 0x1F;

        pdata->vlan_table[vid_dword_index] &= ~(1 << vid_bit_index);

        /* defer register writes to a sleepable context */
        schedule_work(&pdata->set_vlan);

        return 0;
}

static void lan78xx_init_ltm(struct lan78xx_net *dev)
{
        int ret;
        u32 buf;
        u32 regs[6] = { 0 };

        ret = lan78xx_read_reg(dev, USB_CFG1, &buf);
        if (buf & USB_CFG1_LTM_ENABLE_) {
                u8 temp[2];
                /* Get values from EEPROM first */
                if (lan78xx_read_eeprom(dev, 0x3F, 2, temp) == 0) {
                        if (temp[0] == 24) {
                                ret = lan78xx_read_raw_eeprom(dev,
                                                              temp[1] * 2,
                                                              24,
                                                              (u8 *)regs);
                                if (ret < 0)
                                        return;
                        }
                } else if (lan78xx_read_otp(dev, 0x3F, 2, temp) == 0) {
                        if (temp[0] == 24) {
                                ret = lan78xx_read_raw_otp(dev,
                                                           temp[1] * 2,
                                                           24,
                                                           (u8 *)regs);
                                if (ret < 0)
                                        return;
                        }
                }
        }

        lan78xx_write_reg(dev, LTM_BELT_IDLE0, regs[0]);
        lan78xx_write_reg(dev, LTM_BELT_IDLE1, regs[1]);
        lan78xx_write_reg(dev, LTM_BELT_ACT0, regs[2]);
        lan78xx_write_reg(dev, LTM_BELT_ACT1, regs[3]);
        lan78xx_write_reg(dev, LTM_INACTIVE0, regs[4]);
        lan78xx_write_reg(dev, LTM_INACTIVE1, regs[5]);
}

static int lan78xx_urb_config_init(struct lan78xx_net *dev)
{
        int result = 0;

        switch (dev->udev->speed) {
        case USB_SPEED_SUPER:
                dev->rx_urb_size = RX_SS_URB_SIZE;
                dev->tx_urb_size = TX_SS_URB_SIZE;
                dev->n_rx_urbs = RX_SS_URB_NUM;
                dev->n_tx_urbs = TX_SS_URB_NUM;
                dev->bulk_in_delay = SS_BULK_IN_DELAY;
                dev->burst_cap = SS_BURST_CAP_SIZE / SS_USB_PKT_SIZE;
                break;
        case USB_SPEED_HIGH:
                dev->rx_urb_size = RX_HS_URB_SIZE;
                dev->tx_urb_size = TX_HS_URB_SIZE;
                dev->n_rx_urbs = RX_HS_URB_NUM;
                dev->n_tx_urbs = TX_HS_URB_NUM;
                dev->bulk_in_delay = HS_BULK_IN_DELAY;
                dev->burst_cap = HS_BURST_CAP_SIZE / HS_USB_PKT_SIZE;
                break;
        case USB_SPEED_FULL:
                dev->rx_urb_size = RX_FS_URB_SIZE;
                dev->tx_urb_size = TX_FS_URB_SIZE;
                dev->n_rx_urbs = RX_FS_URB_NUM;
                dev->n_tx_urbs = TX_FS_URB_NUM;
                dev->bulk_in_delay = FS_BULK_IN_DELAY;
                dev->burst_cap = FS_BURST_CAP_SIZE / FS_USB_PKT_SIZE;
                break;
        default:
                netdev_warn(dev->net, "USB bus speed not supported\n");
                result = -EIO;
                break;
        }

        return result;
}

static int lan78xx_start_hw(struct lan78xx_net *dev, u32 reg, u32 hw_enable)
{
        return lan78xx_update_reg(dev, reg, hw_enable, hw_enable);
}

static int lan78xx_stop_hw(struct lan78xx_net *dev, u32 reg, u32 hw_enabled,
                           u32 hw_disabled)
{
        unsigned long timeout;
        bool stopped = true;
        int ret;
        u32 buf;

        /* Stop the h/w block (if not already stopped) */

        ret = lan78xx_read_reg(dev, reg, &buf);
        if (ret < 0)
                return ret;

        if (buf & hw_enabled) {
                buf &= ~hw_enabled;

                ret = lan78xx_write_reg(dev, reg, buf);
                if (ret < 0)
                        return ret;

                stopped = false;
                timeout = jiffies + HW_DISABLE_TIMEOUT;
                do  {
                        ret = lan78xx_read_reg(dev, reg, &buf);
                        if (ret < 0)
                                return ret;

                        if (buf & hw_disabled)
                                stopped = true;
                        else
                                msleep(HW_DISABLE_DELAY_MS);
                } while (!stopped && !time_after(jiffies, timeout));
        }

        ret = stopped ? 0 : -ETIME;

        return ret;
}

static int lan78xx_flush_fifo(struct lan78xx_net *dev, u32 reg, u32 fifo_flush)
{
        return lan78xx_update_reg(dev, reg, fifo_flush, fifo_flush);
}

static int lan78xx_start_tx_path(struct lan78xx_net *dev)
{
        int ret;

        netif_dbg(dev, drv, dev->net, "start tx path");

        /* Start the MAC transmitter */

        ret = lan78xx_start_hw(dev, MAC_TX, MAC_TX_TXEN_);
        if (ret < 0)
                return ret;

        /* Start the Tx FIFO */

        ret = lan78xx_start_hw(dev, FCT_TX_CTL, FCT_TX_CTL_EN_);
        if (ret < 0)
                return ret;

        return 0;
}

static int lan78xx_stop_tx_path(struct lan78xx_net *dev)
{
        int ret;

        netif_dbg(dev, drv, dev->net, "stop tx path");

        /* Stop the Tx FIFO */

        ret = lan78xx_stop_hw(dev, FCT_TX_CTL, FCT_TX_CTL_EN_, FCT_TX_CTL_DIS_);
        if (ret < 0)
                return ret;

        /* Stop the MAC transmitter */

        ret = lan78xx_stop_hw(dev, MAC_TX, MAC_TX_TXEN_, MAC_TX_TXD_);
        if (ret < 0)
                return ret;

        return 0;
}

/* The caller must ensure the Tx path is stopped before calling
 * lan78xx_flush_tx_fifo().
 */
static int lan78xx_flush_tx_fifo(struct lan78xx_net *dev)
{
        return lan78xx_flush_fifo(dev, FCT_TX_CTL, FCT_TX_CTL_RST_);
}

static int lan78xx_start_rx_path(struct lan78xx_net *dev)
{
        int ret;

        netif_dbg(dev, drv, dev->net, "start rx path");

        /* Start the Rx FIFO */

        ret = lan78xx_start_hw(dev, FCT_RX_CTL, FCT_RX_CTL_EN_);
        if (ret < 0)
                return ret;

        /* Start the MAC receiver*/

        ret = lan78xx_start_hw(dev, MAC_RX, MAC_RX_RXEN_);
        if (ret < 0)
                return ret;

        return 0;
}

static int lan78xx_stop_rx_path(struct lan78xx_net *dev)
{
        int ret;

        netif_dbg(dev, drv, dev->net, "stop rx path");

        /* Stop the MAC receiver */

        ret = lan78xx_stop_hw(dev, MAC_RX, MAC_RX_RXEN_, MAC_RX_RXD_);
        if (ret < 0)
                return ret;

        /* Stop the Rx FIFO */

        ret = lan78xx_stop_hw(dev, FCT_RX_CTL, FCT_RX_CTL_EN_, FCT_RX_CTL_DIS_);
        if (ret < 0)
                return ret;

        return 0;
}

/* The caller must ensure the Rx path is stopped before calling
 * lan78xx_flush_rx_fifo().
 */
static int lan78xx_flush_rx_fifo(struct lan78xx_net *dev)
{
        return lan78xx_flush_fifo(dev, FCT_RX_CTL, FCT_RX_CTL_RST_);
}

static int lan78xx_reset(struct lan78xx_net *dev)
{
        struct lan78xx_priv *pdata = (struct lan78xx_priv *)(dev->data[0]);
        unsigned long timeout;
        int ret;
        u32 buf;
        u8 sig;

        ret = lan78xx_read_reg(dev, HW_CFG, &buf);
        if (ret < 0)
                return ret;

        buf |= HW_CFG_LRST_;

        ret = lan78xx_write_reg(dev, HW_CFG, buf);
        if (ret < 0)
                return ret;

        timeout = jiffies + HZ;
        do {
                mdelay(1);
                ret = lan78xx_read_reg(dev, HW_CFG, &buf);
                if (ret < 0)
                        return ret;

                if (time_after(jiffies, timeout)) {
                        netdev_warn(dev->net,
                                    "timeout on completion of LiteReset");
                        ret = -ETIMEDOUT;
                        return ret;
                }
        } while (buf & HW_CFG_LRST_);

        lan78xx_init_mac_address(dev);

        /* save DEVID for later usage */
        ret = lan78xx_read_reg(dev, ID_REV, &buf);
        if (ret < 0)
                return ret;

        dev->chipid = (buf & ID_REV_CHIP_ID_MASK_) >> 16;
        dev->chiprev = buf & ID_REV_CHIP_REV_MASK_;

        /* Respond to the IN token with a NAK */
        ret = lan78xx_read_reg(dev, USB_CFG0, &buf);
        if (ret < 0)
                return ret;

        buf |= USB_CFG_BIR_;

        ret = lan78xx_write_reg(dev, USB_CFG0, buf);
        if (ret < 0)
                return ret;

        /* Init LTM */
        lan78xx_init_ltm(dev);

        ret = lan78xx_write_reg(dev, BURST_CAP, dev->burst_cap);
        if (ret < 0)
                return ret;

        ret = lan78xx_write_reg(dev, BULK_IN_DLY, dev->bulk_in_delay);
        if (ret < 0)
                return ret;

        ret = lan78xx_read_reg(dev, HW_CFG, &buf);
        if (ret < 0)
                return ret;

        buf |= HW_CFG_MEF_;

        ret = lan78xx_write_reg(dev, HW_CFG, buf);
        if (ret < 0)
                return ret;

        ret = lan78xx_read_reg(dev, USB_CFG0, &buf);
        if (ret < 0)
                return ret;

        buf |= USB_CFG_BCE_;

        ret = lan78xx_write_reg(dev, USB_CFG0, buf);
        if (ret < 0)
                return ret;

        /* set FIFO sizes */
        buf = (MAX_RX_FIFO_SIZE - 512) / 512;

        ret = lan78xx_write_reg(dev, FCT_RX_FIFO_END, buf);
        if (ret < 0)
                return ret;

        buf = (MAX_TX_FIFO_SIZE - 512) / 512;

        ret = lan78xx_write_reg(dev, FCT_TX_FIFO_END, buf);
        if (ret < 0)
                return ret;