// SPDX-License-Identifier: GPL-2.0-or-later
/*


*/

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#define DRV_NAME        "uli526x"

#include <linux/module.h>

#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/errno.h>
#include <linux/ioport.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ethtool.h>
#include <linux/skbuff.h>
#include <linux/delay.h>
#include <linux/spinlock.h>
#include <linux/dma-mapping.h>
#include <linux/bitops.h>

#include <asm/processor.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <linux/uaccess.h>

#define uw32(reg, val)  iowrite32(val, ioaddr + (reg))
#define ur32(reg)       ioread32(ioaddr + (reg))

/* Board/System/Debug information/definition ---------------- */
#define PCI_ULI5261_ID  0x526110B9      /* ULi M5261 ID*/
#define PCI_ULI5263_ID  0x526310B9      /* ULi M5263 ID*/

#define ULI526X_IO_SIZE 0x100
#define TX_DESC_CNT     0x20            /* Allocated Tx descriptors */
#define RX_DESC_CNT     0x30            /* Allocated Rx descriptors */
#define TX_FREE_DESC_CNT (TX_DESC_CNT - 2)      /* Max TX packet count */
#define TX_WAKE_DESC_CNT (TX_DESC_CNT - 3)      /* TX wakeup count */
#define DESC_ALL_CNT    (TX_DESC_CNT + RX_DESC_CNT)
#define TX_BUF_ALLOC    0x600
#define RX_ALLOC_SIZE   0x620
#define ULI526X_RESET    1
#define CR0_DEFAULT     0
#define CR6_DEFAULT     0x22200000
#define CR7_DEFAULT     0x180c1
#define CR15_DEFAULT    0x06            /* TxJabber RxWatchdog */
#define TDES0_ERR_MASK  0x4302          /* TXJT, LC, EC, FUE */
#define MAX_PACKET_SIZE 1514
#define ULI5261_MAX_MULTICAST 14
#define RX_COPY_SIZE    100
#define MAX_CHECK_PACKET 0x8000

#define ULI526X_10MHF      0
#define ULI526X_100MHF     1
#define ULI526X_10MFD      4
#define ULI526X_100MFD     5
#define ULI526X_AUTO       8

#define ULI526X_TXTH_72 0x400000        /* TX TH 72 byte */
#define ULI526X_TXTH_96 0x404000        /* TX TH 96 byte */
#define ULI526X_TXTH_128        0x0000          /* TX TH 128 byte */
#define ULI526X_TXTH_256        0x4000          /* TX TH 256 byte */
#define ULI526X_TXTH_512        0x8000          /* TX TH 512 byte */
#define ULI526X_TXTH_1K 0xC000          /* TX TH 1K  byte */

#define ULI526X_TIMER_WUT  (jiffies + HZ * 1)/* timer wakeup time : 1 second */
#define ULI526X_TX_TIMEOUT ((16*HZ)/2)  /* tx packet time-out time 8 s" */
#define ULI526X_TX_KICK         (4*HZ/2)        /* tx packet Kick-out time 2 s" */

#define ULI526X_DBUG(dbug_now, msg, value)                      \
do {                                                            \
        if (uli526x_debug || (dbug_now))                        \
                pr_err("%s %lx\n", (msg), (long) (value));      \
} while (0)

#define SHOW_MEDIA_TYPE(mode)                                   \
        pr_err("Change Speed to %sMhz %s duplex\n",             \
               mode & 1 ? "100" : "10",                         \
               mode & 4 ? "full" : "half");


/* CR9 definition: SROM/MII */
#define CR9_SROM_READ   0x4800
#define CR9_SRCS        0x1
#define CR9_SRCLK       0x2
#define CR9_CRDOUT      0x8
#define SROM_DATA_0     0x0
#define SROM_DATA_1     0x4
#define PHY_DATA_1      0x20000
#define PHY_DATA_0      0x00000
#define MDCLKH          0x10000

#define PHY_POWER_DOWN  0x800

#define SROM_V41_CODE   0x14

/* Structure/enum declaration ------------------------------- */
struct tx_desc {
        __le32 tdes0, tdes1, tdes2, tdes3; /* Data for the card */
        char *tx_buf_ptr;               /* Data for us */
        struct tx_desc *next_tx_desc;
} __attribute__(( aligned(32) ));

struct rx_desc {
        __le32 rdes0, rdes1, rdes2, rdes3; /* Data for the card */
        struct sk_buff *rx_skb_ptr;     /* Data for us */
        struct rx_desc *next_rx_desc;
} __attribute__(( aligned(32) ));

struct uli526x_board_info {
        struct uli_phy_ops {
                void (*write)(struct uli526x_board_info *, u8, u8, u16);
                u16 (*read)(struct uli526x_board_info *, u8, u8);
        } phy;
        struct net_device *next_dev;    /* next device */
        struct pci_dev *pdev;           /* PCI device */
        spinlock_t lock;

        void __iomem *ioaddr;           /* I/O base address */
        u32 cr0_data;
        u32 cr5_data;
        u32 cr6_data;
        u32 cr7_data;
        u32 cr15_data;

        /* pointer for memory physical address */
        dma_addr_t buf_pool_dma_ptr;    /* Tx buffer pool memory */
        dma_addr_t buf_pool_dma_start;  /* Tx buffer pool align dword */
        dma_addr_t desc_pool_dma_ptr;   /* descriptor pool memory */
        dma_addr_t first_tx_desc_dma;
        dma_addr_t first_rx_desc_dma;

        /* descriptor pointer */
        unsigned char *buf_pool_ptr;    /* Tx buffer pool memory */
        unsigned char *buf_pool_start;  /* Tx buffer pool align dword */
        unsigned char *desc_pool_ptr;   /* descriptor pool memory */
        struct tx_desc *first_tx_desc;
        struct tx_desc *tx_insert_ptr;
        struct tx_desc *tx_remove_ptr;
        struct rx_desc *first_rx_desc;
        struct rx_desc *rx_insert_ptr;
        struct rx_desc *rx_ready_ptr;   /* packet come pointer */
        unsigned long tx_packet_cnt;    /* transmitted packet count */
        unsigned long rx_avail_cnt;     /* available rx descriptor count */
        unsigned long interval_rx_cnt;  /* rx packet count a callback time */

        u16 dbug_cnt;
        u16 NIC_capability;             /* NIC media capability */
        u16 PHY_reg4;                   /* Saved Phyxcer register 4 value */

        u8 media_mode;                  /* user specify media mode */
        u8 op_mode;                     /* real work media mode */
        u8 phy_addr;
        u8 link_failed;                 /* Ever link failed */
        u8 wait_reset;                  /* Hardware failed, need to reset */
        struct timer_list timer;

        /* Driver defined statistic counter */
        unsigned long tx_fifo_underrun;
        unsigned long tx_loss_carrier;
        unsigned long tx_no_carrier;
        unsigned long tx_late_collision;
        unsigned long tx_excessive_collision;
        unsigned long tx_jabber_timeout;
        unsigned long reset_count;
        unsigned long reset_cr8;
        unsigned long reset_fatal;
        unsigned long reset_TXtimeout;

        /* NIC SROM data */
        unsigned char srom[128];
        u8 init;
};

enum uli526x_offsets {
        DCR0 = 0x00, DCR1 = 0x08, DCR2 = 0x10, DCR3 = 0x18, DCR4 = 0x20,
        DCR5 = 0x28, DCR6 = 0x30, DCR7 = 0x38, DCR8 = 0x40, DCR9 = 0x48,
        DCR10 = 0x50, DCR11 = 0x58, DCR12 = 0x60, DCR13 = 0x68, DCR14 = 0x70,
        DCR15 = 0x78
};

enum uli526x_CR6_bits {
        CR6_RXSC = 0x2, CR6_PBF = 0x8, CR6_PM = 0x40, CR6_PAM = 0x80,
        CR6_FDM = 0x200, CR6_TXSC = 0x2000, CR6_STI = 0x100000,
        CR6_SFT = 0x200000, CR6_RXA = 0x40000000, CR6_NO_PURGE = 0x20000000
};

/* Global variable declaration ----------------------------- */
static int uli526x_debug;
static unsigned char uli526x_media_mode = ULI526X_AUTO;
static u32 uli526x_cr6_user_set;

/* For module input parameter */
static int debug;
static u32 cr6set;
static int mode = 8;

/* function declaration ------------------------------------- */
static int uli526x_open(struct net_device *);
static netdev_tx_t uli526x_start_xmit(struct sk_buff *,
                                            struct net_device *);
static int uli526x_stop(struct net_device *);
static void uli526x_set_filter_mode(struct net_device *);
static const struct ethtool_ops netdev_ethtool_ops;
static u16 read_srom_word(struct uli526x_board_info *, int);
static irqreturn_t uli526x_interrupt(int, void *);
#ifdef CONFIG_NET_POLL_CONTROLLER
static void uli526x_poll(struct net_device *dev);
#endif
static void uli526x_descriptor_init(struct net_device *, void __iomem *);
static void allocate_rx_buffer(struct net_device *);
static void update_cr6(u32, void __iomem *);
static void send_filter_frame(struct net_device *, int);
static u16 phy_readby_cr9(struct uli526x_board_info *, u8, u8);
static u16 phy_readby_cr10(struct uli526x_board_info *, u8, u8);
static void phy_writeby_cr9(struct uli526x_board_info *, u8, u8, u16);
static void phy_writeby_cr10(struct uli526x_board_info *, u8, u8, u16);
static void phy_write_1bit(struct uli526x_board_info *db, u32);
static u16 phy_read_1bit(struct uli526x_board_info *db);
static u8 uli526x_sense_speed(struct uli526x_board_info *);
static void uli526x_process_mode(struct uli526x_board_info *);
static void uli526x_timer(struct timer_list *t);
static void uli526x_rx_packet(struct net_device *, struct uli526x_board_info *);
static void uli526x_free_tx_pkt(struct net_device *, struct uli526x_board_info *);
static void uli526x_reuse_skb(struct uli526x_board_info *, struct sk_buff *);
static void uli526x_dynamic_reset(struct net_device *);
static void uli526x_free_rxbuffer(struct uli526x_board_info *);
static void uli526x_init(struct net_device *);
static void uli526x_set_phyxcer(struct uli526x_board_info *);

static void srom_clk_write(struct uli526x_board_info *db, u32 data)
{
        void __iomem *ioaddr = db->ioaddr;

        uw32(DCR9, data | CR9_SROM_READ | CR9_SRCS);
        udelay(5);
        uw32(DCR9, data | CR9_SROM_READ | CR9_SRCS | CR9_SRCLK);
        udelay(5);
        uw32(DCR9, data | CR9_SROM_READ | CR9_SRCS);
        udelay(5);
}

/* ULI526X network board routine ---------------------------- */

static const struct net_device_ops netdev_ops = {
        .ndo_open               = uli526x_open,
        .ndo_stop               = uli526x_stop,
        .ndo_start_xmit         = uli526x_start_xmit,
        .ndo_set_rx_mode        = uli526x_set_filter_mode,
        .ndo_set_mac_address    = eth_mac_addr,
        .ndo_validate_addr      = eth_validate_addr,
#ifdef CONFIG_NET_POLL_CONTROLLER
        .ndo_poll_controller    = uli526x_poll,
#endif
};

/*
 *      Search ULI526X board, allocate space and register it
 */

static int uli526x_init_one(struct pci_dev *pdev,
                            const struct pci_device_id *ent)
{
        struct uli526x_board_info *db;  /* board information structure */
        struct net_device *dev;
        void __iomem *ioaddr;
        int i, err;

        ULI526X_DBUG(0, "uli526x_init_one()", 0);

        /* Init network device */
        dev = alloc_etherdev(sizeof(*db));
        if (dev == NULL)
                return -ENOMEM;
        SET_NETDEV_DEV(dev, &pdev->dev);

        if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32))) {
                pr_warn("32-bit PCI DMA not available\n");
                err = -ENODEV;
                goto err_out_free;
        }

        /* Enable Master/IO access, Disable memory access */
        err = pci_enable_device(pdev);
        if (err)
                goto err_out_free;

        if (!pci_resource_start(pdev, 0)) {
                pr_err("I/O base is zero\n");
                err = -ENODEV;
                goto err_out_disable;
        }

        if (pci_resource_len(pdev, 0) < (ULI526X_IO_SIZE) ) {
                pr_err("Allocated I/O size too small\n");
                err = -ENODEV;
                goto err_out_disable;
        }

        err = pci_request_regions(pdev, DRV_NAME);
        if (err < 0) {
                pr_err("Failed to request PCI regions\n");
                goto err_out_disable;
        }

        /* Init system & device */
        db = netdev_priv(dev);

        /* Allocate Tx/Rx descriptor memory */
        err = -ENOMEM;

        db->desc_pool_ptr = pci_alloc_consistent(pdev, sizeof(struct tx_desc) * DESC_ALL_CNT + 0x20, &db->desc_pool_dma_ptr);
        if (!db->desc_pool_ptr)
                goto err_out_release;

        db->buf_pool_ptr = pci_alloc_consistent(pdev, TX_BUF_ALLOC * TX_DESC_CNT + 4, &db->buf_pool_dma_ptr);
        if (!db->buf_pool_ptr)
                goto err_out_free_tx_desc;

        db->first_tx_desc = (struct tx_desc *) db->desc_pool_ptr;
        db->first_tx_desc_dma = db->desc_pool_dma_ptr;
        db->buf_pool_start = db->buf_pool_ptr;
        db->buf_pool_dma_start = db->buf_pool_dma_ptr;

        switch (ent->driver_data) {
        case PCI_ULI5263_ID:
                db->phy.write   = phy_writeby_cr10;
                db->phy.read    = phy_readby_cr10;
                break;
        default:
                db->phy.write   = phy_writeby_cr9;
                db->phy.read    = phy_readby_cr9;
                break;
        }

        /* IO region. */
        ioaddr = pci_iomap(pdev, 0, 0);
        if (!ioaddr)
                goto err_out_free_tx_buf;

        db->ioaddr = ioaddr;
        db->pdev = pdev;
        db->init = 1;

        pci_set_drvdata(pdev, dev);

        /* Register some necessary functions */
        dev->netdev_ops = &netdev_ops;
        dev->ethtool_ops = &netdev_ethtool_ops;

        spin_lock_init(&db->lock);


        /* read 64 word srom data */
        for (i = 0; i < 64; i++)
                ((__le16 *) db->srom)[i] = cpu_to_le16(read_srom_word(db, i));

        /* Set Node address */
        if(((u16 *) db->srom)[0] == 0xffff || ((u16 *) db->srom)[0] == 0)               /* SROM absent, so read MAC address from ID Table */
        {
                uw32(DCR0, 0x10000);    //Diagnosis mode
                uw32(DCR13, 0x1c0);     //Reset dianostic pointer port
                uw32(DCR14, 0);         //Clear reset port
                uw32(DCR14, 0x10);      //Reset ID Table pointer
                uw32(DCR14, 0);         //Clear reset port
                uw32(DCR13, 0);         //Clear CR13
                uw32(DCR13, 0x1b0);     //Select ID Table access port
                //Read MAC address from CR14
                for (i = 0; i < 6; i++)
                        dev->dev_addr[i] = ur32(DCR14);
                //Read end
                uw32(DCR13, 0);         //Clear CR13
                uw32(DCR0, 0);          //Clear CR0
                udelay(10);
        }
        else            /*Exist SROM*/
        {
                for (i = 0; i < 6; i++)
                        dev->dev_addr[i] = db->srom[20 + i];
        }
        err = register_netdev (dev);
        if (err)
                goto err_out_unmap;

        netdev_info(dev, "ULi M%04lx at pci%s, %pM, irq %d\n",
                    ent->driver_data >> 16, pci_name(pdev),
                    dev->dev_addr, pdev->irq);

        pci_set_master(pdev);

        return 0;

err_out_unmap:
        pci_iounmap(pdev, db->ioaddr);
err_out_free_tx_buf:
        pci_free_consistent(pdev, TX_BUF_ALLOC * TX_DESC_CNT + 4,
                            db->buf_pool_ptr, db->buf_pool_dma_ptr);
err_out_free_tx_desc:
        pci_free_consistent(pdev, sizeof(struct tx_desc) * DESC_ALL_CNT + 0x20,
                            db->desc_pool_ptr, db->desc_pool_dma_ptr);
err_out_release:
        pci_release_regions(pdev);
err_out_disable:
        pci_disable_device(pdev);
err_out_free:
        free_netdev(dev);

        return err;
}


static void uli526x_remove_one(struct pci_dev *pdev)
{
        struct net_device *dev = pci_get_drvdata(pdev);
        struct uli526x_board_info *db = netdev_priv(dev);

        unregister_netdev(dev);
        pci_iounmap(pdev, db->ioaddr);
        pci_free_consistent(db->pdev, sizeof(struct tx_desc) *
                                DESC_ALL_CNT + 0x20, db->desc_pool_ptr,
                                db->desc_pool_dma_ptr);
        pci_free_consistent(db->pdev, TX_BUF_ALLOC * TX_DESC_CNT + 4,
                                db->buf_pool_ptr, db->buf_pool_dma_ptr);
        pci_release_regions(pdev);
        pci_disable_device(pdev);
        free_netdev(dev);
}


/*
 *      Open the interface.
 *      The interface is opened whenever "ifconfig" activates it.
 */

static int uli526x_open(struct net_device *dev)
{
        int ret;
        struct uli526x_board_info *db = netdev_priv(dev);

        ULI526X_DBUG(0, "uli526x_open", 0);

        /* system variable init */
        db->cr6_data = CR6_DEFAULT | uli526x_cr6_user_set;
        db->tx_packet_cnt = 0;
        db->rx_avail_cnt = 0;
        db->link_failed = 1;
        netif_carrier_off(dev);
        db->wait_reset = 0;

        db->NIC_capability = 0xf;       /* All capability*/
        db->PHY_reg4 = 0x1e0;

        /* CR6 operation mode decision */
        db->cr6_data |= ULI526X_TXTH_256;
        db->cr0_data = CR0_DEFAULT;

        /* Initialize ULI526X board */
        uli526x_init(dev);

        ret = request_irq(db->pdev->irq, uli526x_interrupt, IRQF_SHARED,
                          dev->name, dev);
        if (ret)
                return ret;

        /* Active System Interface */
        netif_wake_queue(dev);

        /* set and active a timer process */
        timer_setup(&db->timer, uli526x_timer, 0);
        db->timer.expires = ULI526X_TIMER_WUT + HZ * 2;
        add_timer(&db->timer);

        return 0;
}


/*      Initialize ULI526X board
 *      Reset ULI526X board
 *      Initialize TX/Rx descriptor chain structure
 *      Send the set-up frame
 *      Enable Tx/Rx machine
 */

static void uli526x_init(struct net_device *dev)
{
        struct uli526x_board_info *db = netdev_priv(dev);
        struct uli_phy_ops *phy = &db->phy;
        void __iomem *ioaddr = db->ioaddr;
        u8      phy_tmp;
        u8      timeout;
        u16 phy_reg_reset;


        ULI526X_DBUG(0, "uli526x_init()", 0);

        /* Reset M526x MAC controller */
        uw32(DCR0, ULI526X_RESET);      /* RESET MAC */
        udelay(100);
        uw32(DCR0, db->cr0_data);
        udelay(5);

        /* Phy addr : In some boards,M5261/M5263 phy address != 1 */
        db->phy_addr = 1;
        for (phy_tmp = 0; phy_tmp < 32; phy_tmp++) {
                u16 phy_value;

                phy_value = phy->read(db, phy_tmp, 3);  //peer add
                if (phy_value != 0xffff && phy_value != 0) {
                        db->phy_addr = phy_tmp;
                        break;
                }
        }

        if (phy_tmp == 32)
                pr_warn("Can not find the phy address!!!\n");
        /* Parser SROM and media mode */
        db->media_mode = uli526x_media_mode;

        /* phyxcer capability setting */
        phy_reg_reset = phy->read(db, db->phy_addr, 0);
        phy_reg_reset = (phy_reg_reset | 0x8000);
        phy->write(db, db->phy_addr, 0, phy_reg_reset);

        /* See IEEE 802.3-2002.pdf (Section 2, Chapter "22.2.4 Management
         * functions") or phy data sheet for details on phy reset
         */
        udelay(500);
        timeout = 10;
        while (timeout-- && phy->read(db, db->phy_addr, 0) & 0x8000)
                udelay(100);

        /* Process Phyxcer Media Mode */
        uli526x_set_phyxcer(db);

        /* Media Mode Process */
        if ( !(db->media_mode & ULI526X_AUTO) )
                db->op_mode = db->media_mode;           /* Force Mode */

        /* Initialize Transmit/Receive descriptor and CR3/4 */
        uli526x_descriptor_init(dev, ioaddr);

        /* Init CR6 to program M526X operation */
        update_cr6(db->cr6_data, ioaddr);

        /* Send setup frame */
        send_filter_frame(dev, netdev_mc_count(dev));   /* M5261/M5263 */

        /* Init CR7, interrupt active bit */
        db->cr7_data = CR7_DEFAULT;
        uw32(DCR7, db->cr7_data);

        /* Init CR15, Tx jabber and Rx watchdog timer */
        uw32(DCR15, db->cr15_data);

        /* Enable ULI526X Tx/Rx function */
        db->cr6_data |= CR6_RXSC | CR6_TXSC;
        update_cr6(db->cr6_data, ioaddr);
}


/*
 *      Hardware start transmission.
 *      Send a packet to media from the upper layer.
 */

static netdev_tx_t uli526x_start_xmit(struct sk_buff *skb,
                                            struct net_device *dev)
{
        struct uli526x_board_info *db = netdev_priv(dev);
        void __iomem *ioaddr = db->ioaddr;
        struct tx_desc *txptr;
        unsigned long flags;

        ULI526X_DBUG(0, "uli526x_start_xmit", 0);

        /* Resource flag check */
        netif_stop_queue(dev);

        /* Too large packet check */
        if (skb->len > MAX_PACKET_SIZE) {
                netdev_err(dev, "big packet = %d\n", (u16)skb->len);
                dev_kfree_skb_any(skb);
                return NETDEV_TX_OK;
        }

        spin_lock_irqsave(&db->lock, flags);

        /* No Tx resource check, it never happen nromally */
        if (db->tx_packet_cnt >= TX_FREE_DESC_CNT) {
                spin_unlock_irqrestore(&db->lock, flags);
                netdev_err(dev, "No Tx resource %ld\n", db->tx_packet_cnt);
                return NETDEV_TX_BUSY;
        }

        /* Disable NIC interrupt */
        uw32(DCR7, 0);

        /* transmit this packet */
        txptr = db->tx_insert_ptr;
        skb_copy_from_linear_data(skb, txptr->tx_buf_ptr, skb->len);
        txptr->tdes1 = cpu_to_le32(0xe1000000 | skb->len);

        /* Point to next transmit free descriptor */
        db->tx_insert_ptr = txptr->next_tx_desc;

        /* Transmit Packet Process */
        if (db->tx_packet_cnt < TX_DESC_CNT) {
                txptr->tdes0 = cpu_to_le32(0x80000000); /* Set owner bit */
                db->tx_packet_cnt++;                    /* Ready to send */
                uw32(DCR1, 0x1);                        /* Issue Tx polling */
                netif_trans_update(dev);                /* saved time stamp */
        }

        /* Tx resource check */
        if ( db->tx_packet_cnt < TX_FREE_DESC_CNT )
                netif_wake_queue(dev);

        /* Restore CR7 to enable interrupt */
        spin_unlock_irqrestore(&db->lock, flags);
        uw32(DCR7, db->cr7_data);

        /* free this SKB */
        dev_consume_skb_any(skb);

        return NETDEV_TX_OK;
}


/*
 *      Stop the interface.
 *      The interface is stopped when it is brought.
 */

static int uli526x_stop(struct net_device *dev)
{
        struct uli526x_board_info *db = netdev_priv(dev);
        void __iomem *ioaddr = db->ioaddr;

        /* disable system */
        netif_stop_queue(dev);

        /* deleted timer */
        del_timer_sync(&db->timer);

        /* Reset & stop ULI526X board */
        uw32(DCR0, ULI526X_RESET);
        udelay(5);
        db->phy.write(db, db->phy_addr, 0, 0x8000);

        /* free interrupt */
        free_irq(db->pdev->irq, dev);

        /* free allocated rx buffer */
        uli526x_free_rxbuffer(db);

        return 0;
}


/*
 *      M5261/M5263 insterrupt handler
 *      receive the packet to upper layer, free the transmitted packet
 */

static irqreturn_t uli526x_interrupt(int irq, void *dev_id)
{
        struct net_device *dev = dev_id;
        struct uli526x_board_info *db = netdev_priv(dev);
        void __iomem *ioaddr = db->ioaddr;
        unsigned long flags;

        spin_lock_irqsave(&db->lock, flags);
        uw32(DCR7, 0);

        /* Got ULI526X status */
        db->cr5_data = ur32(DCR5);
        uw32(DCR5, db->cr5_data);
        if ( !(db->cr5_data & 0x180c1) ) {
                /* Restore CR7 to enable interrupt mask */
                uw32(DCR7, db->cr7_data);
                spin_unlock_irqrestore(&db->lock, flags);
                return IRQ_HANDLED;
        }

        /* Check system status */
        if (db->cr5_data & 0x2000) {
                /* system bus error happen */
                ULI526X_DBUG(1, "System bus error happen. CR5=", db->cr5_data);
                db->reset_fatal++;
                db->wait_reset = 1;     /* Need to RESET */
                spin_unlock_irqrestore(&db->lock, flags);
                return IRQ_HANDLED;
        }

         /* Received the coming packet */
        if ( (db->cr5_data & 0x40) && db->rx_avail_cnt )
                uli526x_rx_packet(dev, db);

        /* reallocate rx descriptor buffer */
        if (db->rx_avail_cnt<RX_DESC_CNT)
                allocate_rx_buffer(dev);

        /* Free the transmitted descriptor */
        if ( db->cr5_data & 0x01)
                uli526x_free_tx_pkt(dev, db);

        /* Restore CR7 to enable interrupt mask */
        uw32(DCR7, db->cr7_data);

        spin_unlock_irqrestore(&db->lock, flags);
        return IRQ_HANDLED;
}

#ifdef CONFIG_NET_POLL_CONTROLLER
static void uli526x_poll(struct net_device *dev)
{
        struct uli526x_board_info *db = netdev_priv(dev);

        /* ISR grabs the irqsave lock, so this should be safe */
        uli526x_interrupt(db->pdev->irq, dev);
}
#endif

/*
 *      Free TX resource after TX complete
 */

static void uli526x_free_tx_pkt(struct net_device *dev,
                                struct uli526x_board_info * db)
{
        struct tx_desc *txptr;
        u32 tdes0;

        txptr = db->tx_remove_ptr;
        while(db->tx_packet_cnt) {
                tdes0 = le32_to_cpu(txptr->tdes0);
                if (tdes0 & 0x80000000)
                        break;

                /* A packet sent completed */
                db->tx_packet_cnt--;
                dev->stats.tx_packets++;

                /* Transmit statistic counter */
                if ( tdes0 != 0x7fffffff ) {
                        dev->stats.collisions += (tdes0 >> 3) & 0xf;
                        dev->stats.tx_bytes += le32_to_cpu(txptr->tdes1) & 0x7ff;
                        if (tdes0 & TDES0_ERR_MASK) {
                                dev->stats.tx_errors++;
                                if (tdes0 & 0x0002) {   /* UnderRun */
                                        db->tx_fifo_underrun++;
                                        if ( !(db->cr6_data & CR6_SFT) ) {
                                                db->cr6_data = db->cr6_data | CR6_SFT;
                                                update_cr6(db->cr6_data, db->ioaddr);
                                        }
                                }
                                if (tdes0 & 0x0100)
                                        db->tx_excessive_collision++;
                                if (tdes0 & 0x0200)
                                        db->tx_late_collision++;
                                if (tdes0 & 0x0400)
                                        db->tx_no_carrier++;
                                if (tdes0 & 0x0800)
                                        db->tx_loss_carrier++;
                                if (tdes0 & 0x4000)
                                        db->tx_jabber_timeout++;
                        }
                }

                txptr = txptr->next_tx_desc;
        }/* End of while */

        /* Update TX remove pointer to next */
        db->tx_remove_ptr = txptr;

        /* Resource available check */
        if ( db->tx_packet_cnt < TX_WAKE_DESC_CNT )
                netif_wake_queue(dev);  /* Active upper layer, send again */
}


/*
 *      Receive the come packet and pass to upper layer
 */

static void uli526x_rx_packet(struct net_device *dev, struct uli526x_board_info * db)
{
        struct rx_desc *rxptr;
        struct sk_buff *skb;
        int rxlen;
        u32 rdes0;

        rxptr = db->rx_ready_ptr;

        while(db->rx_avail_cnt) {
                rdes0 = le32_to_cpu(rxptr->rdes0);
                if (rdes0 & 0x80000000) /* packet owner check */
                {
                        break;
                }

                db->rx_avail_cnt--;
                db->interval_rx_cnt++;

                pci_unmap_single(db->pdev, le32_to_cpu(rxptr->rdes2), RX_ALLOC_SIZE, PCI_DMA_FROMDEVICE);
                if ( (rdes0 & 0x300) != 0x300) {
                        /* A packet without First/Last flag */
                        /* reuse this SKB */
                        ULI526X_DBUG(0, "Reuse SK buffer, rdes0", rdes0);
                        uli526x_reuse_skb(db, rxptr->rx_skb_ptr);
                } else {
                        /* A packet with First/Last flag */
                        rxlen = ( (rdes0 >> 16) & 0x3fff) - 4;

                        /* error summary bit check */
                        if (rdes0 & 0x8000) {
                                /* This is a error packet */
                                dev->stats.rx_errors++;
                                if (rdes0 & 1)
                                        dev->stats.rx_fifo_errors++;
                                if (rdes0 & 2)
                                        dev->stats.rx_crc_errors++;
                                if (rdes0 & 0x80)
                                        dev->stats.rx_length_errors++;
                        }

                        if ( !(rdes0 & 0x8000) ||
                                ((db->cr6_data & CR6_PM) && (rxlen>6)) ) {
                                struct sk_buff *new_skb = NULL;

                                skb = rxptr->rx_skb_ptr;

                                /* Good packet, send to upper layer */
                                /* Shorst packet used new SKB */
                                if ((rxlen < RX_COPY_SIZE) &&
                                    (((new_skb = netdev_alloc_skb(dev, rxlen + 2)) != NULL))) {
                                        skb = new_skb;
                                        /* size less than COPY_SIZE, allocate a rxlen SKB */
                                        skb_reserve(skb, 2); /* 16byte align */
                                        skb_put_data(skb,
                                                     skb_tail_pointer(rxptr->rx_skb_ptr),
                                                     rxlen);
                                        uli526x_reuse_skb(db, rxptr->rx_skb_ptr);
                                } else
                                        skb_put(skb, rxlen);

                                skb->protocol = eth_type_trans(skb, dev);
                                netif_rx(skb);
                                dev->stats.rx_packets++;
                                dev->stats.rx_bytes += rxlen;

                        } else {
                                /* Reuse SKB buffer when the packet is error */
                                ULI526X_DBUG(0, "Reuse SK buffer, rdes0", rdes0);
                                uli526x_reuse_skb(db, rxptr->rx_skb_ptr);
                        }
                }

                rxptr = rxptr->next_rx_desc;
        }

        db->rx_ready_ptr = rxptr;
}


/*
 * Set ULI526X multicast address
 */

static void uli526x_set_filter_mode(struct net_device * dev)
{
        struct uli526x_board_info *db = netdev_priv(dev);
        unsigned long flags;

        ULI526X_DBUG(0, "uli526x_set_filter_mode()", 0);
        spin_lock_irqsave(&db->lock, flags);

        if (dev->flags & IFF_PROMISC) {
                ULI526X_DBUG(0, "Enable PROM Mode", 0);
                db->cr6_data |= CR6_PM | CR6_PBF;
                update_cr6(db->cr6_data, db->ioaddr);
                spin_unlock_irqrestore(&db->lock, flags);
                return;
        }

        if (dev->flags & IFF_ALLMULTI ||
            netdev_mc_count(dev) > ULI5261_MAX_MULTICAST) {
                ULI526X_DBUG(0, "Pass all multicast address",
                             netdev_mc_count(dev));
                db->cr6_data &= ~(CR6_PM | CR6_PBF);
                db->cr6_data |= CR6_PAM;
                spin_unlock_irqrestore(&db->lock, flags);
                return;
        }

        ULI526X_DBUG(0, "Set multicast address", netdev_mc_count(dev));
        send_filter_frame(dev, netdev_mc_count(dev));   /* M5261/M5263 */
        spin_unlock_irqrestore(&db->lock, flags);
}

static void
ULi_ethtool_get_link_ksettings(struct uli526x_board_info *db,
                               struct ethtool_link_ksettings *cmd)
{
        u32 supported, advertising;

        supported = (SUPPORTED_10baseT_Half |
                           SUPPORTED_10baseT_Full |
                           SUPPORTED_100baseT_Half |
                           SUPPORTED_100baseT_Full |
                           SUPPORTED_Autoneg |
                           SUPPORTED_MII);

        advertising = (ADVERTISED_10baseT_Half |
                           ADVERTISED_10baseT_Full |
                           ADVERTISED_100baseT_Half |
                           ADVERTISED_100baseT_Full |
                           ADVERTISED_Autoneg |
                           ADVERTISED_MII);

        ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.supported,
                                                supported);
        ethtool_convert_legacy_u32_to_link_mode(cmd->link_modes.advertising,
                                                advertising);

        cmd->base.port = PORT_MII;
        cmd->base.phy_address = db->phy_addr;

        cmd->base.speed = SPEED_10;
        cmd->base.duplex = DUPLEX_HALF;

        if(db->op_mode==ULI526X_100MHF || db->op_mode==ULI526X_100MFD)
        {
                cmd->base.speed = SPEED_100;
        }
        if(db->op_mode==ULI526X_10MFD || db->op_mode==ULI526X_100MFD)
        {
                cmd->base.duplex = DUPLEX_FULL;
        }
        if(db->link_failed)
        {
                cmd->base.speed = SPEED_UNKNOWN;
                cmd->base.duplex = DUPLEX_UNKNOWN;
        }

        if (db->media_mode & ULI526X_AUTO)
        {
                cmd->base.autoneg = AUTONEG_ENABLE;
        }
}

static void netdev_get_drvinfo(struct net_device *dev,
                               struct ethtool_drvinfo *info)
{
        struct uli526x_board_info *np = netdev_priv(dev);

        strlcpy(info->driver, DRV_NAME, sizeof(info->driver));
        strlcpy(info->bus_info, pci_name(np->pdev), sizeof(info->bus_info));
}

static int netdev_get_link_ksettings(struct net_device *dev,
                                     struct ethtool_link_ksettings *cmd)
{
        struct uli526x_board_info *np = netdev_priv(dev);

        ULi_ethtool_get_link_ksettings(np, cmd);

        return 0;
}

static u32 netdev_get_link(struct net_device *dev) {
        struct uli526x_board_info *np = netdev_priv(dev);

        if(np->link_failed)
                return 0;
        else
                return 1;
}

static void uli526x_get_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
{
        wol->supported = WAKE_PHY | WAKE_MAGIC;
        wol->wolopts = 0;
}

static const struct ethtool_ops netdev_ethtool_ops = {
        .get_drvinfo            = netdev_get_drvinfo,
        .get_link               = netdev_get_link,
        .get_wol                = uli526x_get_wol,
        .get_link_ksettings     = netdev_get_link_ksettings,
};

/*
 *      A periodic timer routine
 *      Dynamic media sense, allocate Rx buffer...
 */

static void uli526x_timer(struct timer_list *t)
{
        struct uli526x_board_info *db = from_timer(db, t, timer);
        struct net_device *dev = pci_get_drvdata(db->pdev);
        struct uli_phy_ops *phy = &db->phy;
        void __iomem *ioaddr = db->ioaddr;
        unsigned long flags;
        u8 tmp_cr12 = 0;
        u32 tmp_cr8;

        //ULI526X_DBUG(0, "uli526x_timer()", 0);
        spin_lock_irqsave(&db->lock, flags);


        /* Dynamic reset ULI526X : system error or transmit time-out */
        tmp_cr8 = ur32(DCR8);
        if ( (db->interval_rx_cnt==0) && (tmp_cr8) ) {
                db->reset_cr8++;
                db->wait_reset = 1;
        }
        db->interval_rx_cnt = 0;

        /* TX polling kick monitor */
        if ( db->tx_packet_cnt &&
             time_after(jiffies, dev_trans_start(dev) + ULI526X_TX_KICK) ) {
                uw32(DCR1, 0x1);   // Tx polling again

                // TX Timeout
                if ( time_after(jiffies, dev_trans_start(dev) + ULI526X_TX_TIMEOUT) ) {
                        db->reset_TXtimeout++;
                        db->wait_reset = 1;
                        netdev_err(dev, " Tx timeout - resetting\n");
                }
        }

        if (db->wait_reset) {
                ULI526X_DBUG(0, "Dynamic Reset device", db->tx_packet_cnt);
                db->reset_count++;
                uli526x_dynamic_reset(dev);
                db->timer.expires = ULI526X_TIMER_WUT;
                add_timer(&db->timer);
                spin_unlock_irqrestore(&db->lock, flags);
                return;
        }

        /* Link status check, Dynamic media type change */
        if ((phy->read(db, db->phy_addr, 5) & 0x01e0)!=0)
                tmp_cr12 = 3;

        if ( !(tmp_cr12 & 0x3) && !db->link_failed ) {
                /* Link Failed */
                ULI526X_DBUG(0, "Link Failed", tmp_cr12);
                netif_carrier_off(dev);
                netdev_info(dev, "NIC Link is Down\n");
                db->link_failed = 1;

                /* For Force 10/100M Half/Full mode: Enable Auto-Nego mode */
                /* AUTO don't need */
                if ( !(db->media_mode & 0x8) )
                        phy->write(db, db->phy_addr, 0, 0x1000);

                /* AUTO mode, if INT phyxcer link failed, select EXT device */
                if (db->media_mode & ULI526X_AUTO) {
                        db->cr6_data&=~0x00000200;      /* bit9=0, HD mode */
                        update_cr6(db->cr6_data, db->ioaddr);
                }
        } else
                if ((tmp_cr12 & 0x3) && db->link_failed) {
                        ULI526X_DBUG(0, "Link link OK", tmp_cr12);
                        db->link_failed = 0;

                        /* Auto Sense Speed */
                        if ( (db->media_mode & ULI526X_AUTO) &&
                                uli526x_sense_speed(db) )
                                db->link_failed = 1;
                        uli526x_process_mode(db);

                        if(db->link_failed==0)
                        {
                                netdev_info(dev, "NIC Link is Up %d Mbps %s duplex\n",
                                            (db->op_mode == ULI526X_100MHF ||
                                             db->op_mode == ULI526X_100MFD)
                                            ? 100 : 10,
                                            (db->op_mode == ULI526X_10MFD ||
                                             db->op_mode == ULI526X_100MFD)
                                            ? "Full" : "Half");
                                netif_carrier_on(dev);
                        }
                        /* SHOW_MEDIA_TYPE(db->op_mode); */
                }
                else if(!(tmp_cr12 & 0x3) && db->link_failed)
                {
                        if(db->init==1)
                        {
                                netdev_info(dev, "NIC Link is Down\n");
                                netif_carrier_off(dev);
                        }
                }
        db->init = 0;

        /* Timer active again */
        db->timer.expires = ULI526X_TIMER_WUT;
        add_timer(&db->timer);
        spin_unlock_irqrestore(&db->lock, flags);
}


/*
 *      Stop ULI526X board
 *      Free Tx/Rx allocated memory
 *      Init system variable
 */

static void uli526x_reset_prepare(struct net_device *dev)
{
        struct uli526x_board_info *db = netdev_priv(dev);
        void __iomem *ioaddr = db->ioaddr;

        /* Sopt MAC controller */
        db->cr6_data &= ~(CR6_RXSC | CR6_TXSC); /* Disable Tx/Rx */
        update_cr6(db->cr6_data, ioaddr);
        uw32(DCR7, 0);                          /* Disable Interrupt */
        uw32(DCR5, ur32(DCR5));

        /* Disable upper layer interface */
        netif_stop_queue(dev);

        /* Free Rx Allocate buffer */
        uli526x_free_rxbuffer(db);

        /* system variable init */
        db->tx_packet_cnt = 0;
        db->rx_avail_cnt = 0;
        db->link_failed = 1;
        db->init=1;
        db->wait_reset = 0;
}


/*
 *      Dynamic reset the ULI526X board
 *      Stop ULI526X board
 *      Free Tx/Rx allocated memory
 *      Reset ULI526X board
 *      Re-initialize ULI526X board
 */

static void uli526x_dynamic_reset(struct net_device *dev)
{
        ULI526X_DBUG(0, "uli526x_dynamic_reset()", 0);

        uli526x_reset_prepare(dev);

        /* Re-initialize ULI526X board */
        uli526x_init(dev);

        /* Restart upper layer interface */
        netif_wake_queue(dev);
}

/*
 *      Suspend the interface.
 */

static int __maybe_unused uli526x_suspend(struct device *dev_d)
{
        struct net_device *dev = dev_get_drvdata(dev_d);

        ULI526X_DBUG(0, "uli526x_suspend", 0);

        if (!netif_running(dev))
                return 0;

        netif_device_detach(dev);
        uli526x_reset_prepare(dev);

        device_set_wakeup_enable(dev_d, 0);

        return 0;
}

/*
 *      Resume the interface.
 */

static int __maybe_unused uli526x_resume(struct device *dev_d)
{
        struct net_device *dev = dev_get_drvdata(dev_d);

        ULI526X_DBUG(0, "uli526x_resume", 0);


        if (!netif_running(dev))
                return 0;

        netif_device_attach(dev);
        /* Re-initialize ULI526X board */
        uli526x_init(dev);
        /* Restart upper layer interface */
        netif_wake_queue(dev);

        return 0;
}

/*
 *      free all allocated rx buffer
 */

static void uli526x_free_rxbuffer(struct uli526x_board_info * db)
{
        ULI526X_DBUG(0, "uli526x_free_rxbuffer()", 0);

        /* free allocated rx buffer */
        while (db->rx_avail_cnt) {
                dev_kfree_skb(db->rx_ready_ptr->rx_skb_ptr);
                db->rx_ready_ptr = db->rx_ready_ptr->next_rx_desc;
                db->rx_avail_cnt--;
        }
}


/*
 *      Reuse the SK buffer
 */

static void uli526x_reuse_skb(struct uli526x_board_info *db, struct sk_buff * skb)
{
        struct rx_desc *rxptr = db->rx_insert_ptr;

        if (!(rxptr->rdes0 & cpu_to_le32(0x80000000))) {
                rxptr->rx_skb_ptr = skb;
                rxptr->rdes2 = cpu_to_le32(pci_map_single(db->pdev,
                                                          skb_tail_pointer(skb),
                                                          RX_ALLOC_SIZE,
                                                          PCI_DMA_FROMDEVICE));
                wmb();
                rxptr->rdes0 = cpu_to_le32(0x80000000);
                db->rx_avail_cnt++;
                db->rx_insert_ptr = rxptr->next_rx_desc;
        } else
                ULI526X_DBUG(0, "SK Buffer reuse method error", db->rx_avail_cnt);
}


/*
 *      Initialize transmit/Receive descriptor
 *      Using Chain structure, and allocate Tx/Rx buffer
 */

static void uli526x_descriptor_init(struct net_device *dev, void __iomem *ioaddr)
{
        struct uli526x_board_info *db = netdev_priv(dev);
        struct tx_desc *tmp_tx;
        struct rx_desc *tmp_rx;
        unsigned char *tmp_buf;
        dma_addr_t tmp_tx_dma, tmp_rx_dma;
        dma_addr_t tmp_buf_dma;
        int i;

        ULI526X_DBUG(0, "uli526x_descriptor_init()", 0);

        /* tx descriptor start pointer */
        db->tx_insert_ptr = db->first_tx_desc;
        db->tx_remove_ptr = db->first_tx_desc;
        uw32(DCR4, db->first_tx_desc_dma);      /* TX DESC address */

        /* rx descriptor start pointer */
        db->first_rx_desc = (void *)db->first_tx_desc + sizeof(struct tx_desc) * TX_DESC_CNT;
        db->first_rx_desc_dma =  db->first_tx_desc_dma + sizeof(struct tx_desc) * TX_DESC_CNT;
        db->rx_insert_ptr = db->first_rx_desc;
        db->rx_ready_ptr = db->first_rx_desc;
        uw32(DCR3, db->first_rx_desc_dma);      /* RX DESC address */

        /* Init Transmit chain */
        tmp_buf = db->buf_pool_start;
        tmp_buf_dma = db->buf_pool_dma_start;
        tmp_tx_dma = db->first_tx_desc_dma;
        for (tmp_tx = db->first_tx_desc, i = 0; i < TX_DESC_CNT; i++, tmp_tx++) {
                tmp_tx->tx_buf_ptr = tmp_buf;
                tmp_tx->tdes0 = cpu_to_le32(0);
                tmp_tx->tdes1 = cpu_to_le32(0x81000000);        /* IC, chain */
                tmp_tx->tdes2 = cpu_to_le32(tmp_buf_dma);
                tmp_tx_dma += sizeof(struct tx_desc);
                tmp_tx->tdes3 = cpu_to_le32(tmp_tx_dma);
                tmp_tx->next_tx_desc = tmp_tx + 1;
                tmp_buf = tmp_buf + TX_BUF_ALLOC;
                tmp_buf_dma = tmp_buf_dma + TX_BUF_ALLOC;
        }
        (--tmp_tx)->tdes3 = cpu_to_le32(db->first_tx_desc_dma);
        tmp_tx->next_tx_desc = db->first_tx_desc;

         /* Init Receive descriptor chain */
        tmp_rx_dma=db->first_rx_desc_dma;
        for (tmp_rx = db->first_rx_desc, i = 0; i < RX_DESC_CNT; i++, tmp_rx++) {
                tmp_rx->rdes0 = cpu_to_le32(0);
                tmp_rx->rdes1 = cpu_to_le32(0x01000600);
                tmp_rx_dma += sizeof(struct rx_desc);
                tmp_rx->rdes3 = cpu_to_le32(tmp_rx_dma);
                tmp_rx->next_rx_desc = tmp_rx + 1;
        }
        (--tmp_rx)->rdes3 = cpu_to_le32(db->first_rx_desc_dma);
        tmp_rx->next_rx_desc = db->first_rx_desc;

        /* pre-allocate Rx buffer */
        allocate_rx_buffer(dev);
}


/*
 *      Update CR6 value
 *      Firstly stop ULI526X, then written value and start
 */
static void update_cr6(u32 cr6_data, void __iomem *ioaddr)
{
        uw32(DCR6, cr6_data);
        udelay(5);
}


/*
 *      Send a setup frame for M5261/M5263
 *      This setup frame initialize ULI526X address filter mode
 */

#ifdef __BIG_ENDIAN
#define FLT_SHIFT 16
#else
#define FLT_SHIFT 0
#endif

static void send_filter_frame(struct net_device *dev, int mc_cnt)
{
        struct uli526x_board_info *db = netdev_priv(dev);
        void __iomem *ioaddr = db->ioaddr;
        struct netdev_hw_addr *ha;
        struct tx_desc *txptr;
        u16 * addrptr;
        u32 * suptr;
        int i;

        ULI526X_DBUG(0, "send_filter_frame()", 0);

        txptr = db->tx_insert_ptr;
        suptr = (u32 *) txptr->tx_buf_ptr;

        /* Node address */
        addrptr = (u16 *) dev->dev_addr;
        *suptr++ = addrptr[0] << FLT_SHIFT;
        *suptr++ = addrptr[1] << FLT_SHIFT;
        *suptr++ = addrptr[2] << FLT_SHIFT;

        /* broadcast address */
        *suptr++ = 0xffff << FLT_SHIFT;
        *suptr++ = 0xffff << FLT_SHIFT;
        *suptr++ = 0xffff << FLT_SHIFT;

        /* fit the multicast address */
        netdev_for_each_mc_addr(ha, dev) {
                addrptr = (u16 *) ha->addr;
                *suptr++ = addrptr[0] << FLT_SHIFT;
                *suptr++ = addrptr[1] << FLT_SHIFT;
                *suptr++ = addrptr[2] << FLT_SHIFT;
        }

        for (i = netdev_mc_count(dev); i < 14; i++) {
                *suptr++ = 0xffff << FLT_SHIFT;
                *suptr++ = 0xffff << FLT_SHIFT;
                *suptr++ = 0xffff << FLT_SHIFT;
        }

        /* prepare the setup frame */
        db->tx_insert_ptr = txptr->next_tx_desc;
        txptr->tdes1 = cpu_to_le32(0x890000c0);

        /* Resource Check and Send the setup packet */
        if (db->tx_packet_cnt < TX_DESC_CNT) {
                /* Resource Empty */
                db->tx_packet_cnt++;
                txptr->tdes0 = cpu_to_le32(0x80000000);
                update_cr6(db->cr6_data | 0x2000, ioaddr);
                uw32(DCR1, 0x1);        /* Issue Tx polling */
                update_cr6(db->cr6_data, ioaddr);
                netif_trans_update(dev);
        } else
                netdev_err(dev, "No Tx resource - Send_filter_frame!\n");
}


/*
 *      Allocate rx buffer,
 *      As possible as allocate maxiumn Rx buffer
 */

static void allocate_rx_buffer(struct net_device *dev)
{
        struct uli526x_board_info *db = netdev_priv(dev);
        struct rx_desc *rxptr;
        struct sk_buff *skb;

        rxptr = db->rx_insert_ptr;

        while(db->rx_avail_cnt < RX_DESC_CNT) {
                skb = netdev_alloc_skb(dev, RX_ALLOC_SIZE);
                if (skb == NULL)
                        break;
                rxptr->rx_skb_ptr = skb; /* FIXME (?) */
                rxptr->rdes2 = cpu_to_le32(pci_map_single(db->pdev,
                                                          skb_tail_pointer(skb),
                                                          RX_ALLOC_SIZE,
                                                          PCI_DMA_FROMDEVICE));
                wmb();
                rxptr->rdes0 = cpu_to_le32(0x80000000);
                rxptr = rxptr->next_rx_desc;
                db->rx_avail_cnt++;
        }

        db->rx_insert_ptr = rxptr;
}


/*
 *      Read one word data from the serial ROM
 */

static u16 read_srom_word(struct uli526x_board_info *db, int offset)
{
        void __iomem *ioaddr = db->ioaddr;
        u16 srom_data = 0;
        int i;

        uw32(DCR9, CR9_SROM_READ);
        uw32(DCR9, CR9_SROM_READ | CR9_SRCS);

        /* Send the Read Command 110b */
        srom_clk_write(db, SROM_DATA_1);
        srom_clk_write(db, SROM_DATA_1);
        srom_clk_write(db, SROM_DATA_0);

        /* Send the offset */
        for (i = 5; i >= 0; i--) {
                srom_data = (offset & (1 << i)) ? SROM_DATA_1 : SROM_DATA_0;
                srom_clk_write(db, srom_data);
        }

        uw32(DCR9, CR9_SROM_READ | CR9_SRCS);

        for (i = 16; i > 0; i--) {
                uw32(DCR9, CR9_SROM_READ | CR9_SRCS | CR9_SRCLK);
                udelay(5);
                srom_data = (srom_data << 1) |
                            ((ur32(DCR9) & CR9_CRDOUT) ? 1 : 0);
                uw32(DCR9, CR9_SROM_READ | CR9_SRCS);
                udelay(5);
        }

        uw32(DCR9, CR9_SROM_READ);
        return srom_data;
}


/*
 *      Auto sense the media mode
 */

static u8 uli526x_sense_speed(struct uli526x_board_info * db)
{
        struct uli_phy_ops *phy = &db->phy;
        u8 ErrFlag = 0;
        u16 phy_mode;

        phy_mode = phy->read(db, db->phy_addr, 1);
        phy_mode = phy->read(db, db->phy_addr, 1);

        if ( (phy_mode & 0x24) == 0x24 ) {

                phy_mode = ((phy->read(db, db->phy_addr, 5) & 0x01e0)<<7);
                if(phy_mode&0x8000)
                        phy_mode = 0x8000;
                else if(phy_mode&0x4000)
                        phy_mode = 0x4000;
                else if(phy_mode&0x2000)
                        phy_mode = 0x2000;
                else
                        phy_mode = 0x1000;

                switch (phy_mode) {
                case 0x1000: db->op_mode = ULI526X_10MHF; break;
                case 0x2000: db->op_mode = ULI526X_10MFD; break;
                case 0x4000: db->op_mode = ULI526X_100MHF; break;
                case 0x8000: db->op_mode = ULI526X_100MFD; break;
                default: db->op_mode = ULI526X_10MHF; ErrFlag = 1; break;
                }
        } else {
                db->op_mode = ULI526X_10MHF;
                ULI526X_DBUG(0, "Link Failed :", phy_mode);
                ErrFlag = 1;
        }

        return ErrFlag;
}


/*
 *      Set 10/100 phyxcer capability
 *      AUTO mode : phyxcer register4 is NIC capability
 *      Force mode: phyxcer register4 is the force media
 */

static void uli526x_set_phyxcer(struct uli526x_board_info *db)
{
        struct uli_phy_ops *phy = &db->phy;
        u16 phy_reg;

        /* Phyxcer capability setting */
        phy_reg = phy->read(db, db->phy_addr, 4) & ~0x01e0;

        if (db->media_mode & ULI526X_AUTO) {
                /* AUTO Mode */
                phy_reg |= db->PHY_reg4;
        } else {
                /* Force Mode */
                switch(db->media_mode) {
                case ULI526X_10MHF: phy_reg |= 0x20; break;
                case ULI526X_10MFD: phy_reg |= 0x40; break;
                case ULI526X_100MHF: phy_reg |= 0x80; break;
                case ULI526X_100MFD: phy_reg |= 0x100; break;
                }

        }

        /* Write new capability to Phyxcer Reg4 */
        if ( !(phy_reg & 0x01e0)) {
                phy_reg|=db->PHY_reg4;
                db->media_mode|=ULI526X_AUTO;
        }
        phy->write(db, db->phy_addr, 4, phy_reg);

        /* Restart Auto-Negotiation */
        phy->write(db, db->phy_addr, 0, 0x1200);
        udelay(50);
}


/*
 *      Process op-mode
        AUTO mode : PHY controller in Auto-negotiation Mode
 *      Force mode: PHY controller in force mode with HUB
 *                      N-way force capability with SWITCH
 */

static void uli526x_process_mode(struct uli526x_board_info *db)
{
        struct uli_phy_ops *phy = &db->phy;
        u16 phy_reg;

        /* Full Duplex Mode Check */
        if (db->op_mode & 0x4)
                db->cr6_data |= CR6_FDM;        /* Set Full Duplex Bit */
        else
                db->cr6_data &= ~CR6_FDM;       /* Clear Full Duplex Bit */

        update_cr6(db->cr6_data, db->ioaddr);

        /* 10/100M phyxcer force mode need */
        if (!(db->media_mode & 0x8)) {
                /* Forece Mode */
                phy_reg = phy->read(db, db->phy_addr, 6);
                if (!(phy_reg & 0x1)) {
                        /* parter without N-Way capability */
                        phy_reg = 0x0;
                        switch(db->op_mode) {
                        case ULI526X_10MHF: phy_reg = 0x0; break;
                        case ULI526X_10MFD: phy_reg = 0x100; break;
                        case ULI526X_100MHF: phy_reg = 0x2000; break;
                        case ULI526X_100MFD: phy_reg = 0x2100; break;
                        }
                        phy->write(db, db->phy_addr, 0, phy_reg);
                }
        }
}


/* M5261/M5263 Chip */
static void phy_writeby_cr9(struct uli526x_board_info *db, u8 phy_addr,
                            u8 offset, u16 phy_data)
{
        u16 i;

        /* Send 33 synchronization clock to Phy controller */
        for (i = 0; i < 35; i++)
                phy_write_1bit(db, PHY_DATA_1);

        /* Send start command(01) to Phy */
        phy_write_1bit(db, PHY_DATA_0);
        phy_write_1bit(db, PHY_DATA_1);

        /* Send write command(01) to Phy */
        phy_write_1bit(db, PHY_DATA_0);
        phy_write_1bit(db, PHY_DATA_1);

        /* Send Phy address */
        for (i = 0x10; i > 0; i = i >> 1)
                phy_write_1bit(db, phy_addr & i ? PHY_DATA_1 : PHY_DATA_0);

        /* Send register address */
        for (i = 0x10; i > 0; i = i >> 1)
                phy_write_1bit(db, offset & i ? PHY_DATA_1 : PHY_DATA_0);

        /* written trasnition */
        phy_write_1bit(db, PHY_DATA_1);
        phy_write_1bit(db, PHY_DATA_0);

        /* Write a word data to PHY controller */
        for (i = 0x8000; i > 0; i >>= 1)
                phy_write_1bit(db, phy_data & i ? PHY_DATA_1 : PHY_DATA_0);
}

static u16 phy_readby_cr9(struct uli526x_board_info *db, u8 phy_addr, u8 offset)
{
        u16 phy_data;
        int i;

        /* Send 33 synchronization clock to Phy controller */
        for (i = 0; i < 35; i++)
                phy_write_1bit(db, PHY_DATA_1);

        /* Send start command(01) to Phy */
        phy_write_1bit(db, PHY_DATA_0);
        phy_write_1bit(db, PHY_DATA_1);

        /* Send read command(10) to Phy */
        phy_write_1bit(db, PHY_DATA_1);
        phy_write_1bit(db, PHY_DATA_0);

        /* Send Phy address */
        for (i = 0x10; i > 0; i = i >> 1)
                phy_write_1bit(db, phy_addr & i ? PHY_DATA_1 : PHY_DATA_0);

        /* Send register address */
        for (i = 0x10; i > 0; i = i >> 1)
                phy_write_1bit(db, offset & i ? PHY_DATA_1 : PHY_DATA_0);

        /* Skip transition state */
        phy_read_1bit(db);

        /* read 16bit data */
        for (phy_data = 0, i = 0; i < 16; i++) {
                phy_data <<= 1;
                phy_data |= phy_read_1bit(db);
        }

        return phy_data;
}

static u16 phy_readby_cr10(struct uli526x_board_info *db, u8 phy_addr,
                           u8 offset)
{
        void __iomem *ioaddr = db->ioaddr;
        u32 cr10_value = phy_addr;

        cr10_value = (cr10_value <<  5) + offset;
        cr10_value = (cr10_value << 16) + 0x08000000;
        uw32(DCR10, cr10_value);
        udelay(1);
        while (1) {
                cr10_value = ur32(DCR10);
                if (cr10_value & 0x10000000)
                        break;
        }
        return cr10_value & 0x0ffff;
}

static void phy_writeby_cr10(struct uli526x_board_info *db, u8 phy_addr,
                             u8 offset, u16 phy_data)
{
        void __iomem *ioaddr = db->ioaddr;
        u32 cr10_value = phy_addr;

        cr10_value = (cr10_value <<  5) + offset;
        cr10_value = (cr10_value << 16) + 0x04000000 + phy_data;
        uw32(DCR10, cr10_value);
        udelay(1);
}
/*
 *      Write one bit data to Phy Controller
 */

static void phy_write_1bit(struct uli526x_board_info *db, u32 data)
{
        void __iomem *ioaddr = db->ioaddr;

        uw32(DCR9, data);               /* MII Clock Low */
        udelay(1);
        uw32(DCR9, data | MDCLKH);      /* MII Clock High */
        udelay(1);
        uw32(DCR9, data);               /* MII Clock Low */
        udelay(1);
}


/*
 *      Read one bit phy data from PHY controller
 */

static u16 phy_read_1bit(struct uli526x_board_info *db)
{
        void __iomem *ioaddr = db->ioaddr;
        u16 phy_data;

        uw32(DCR9, 0x50000);
        udelay(1);
        phy_data = (ur32(DCR9) >> 19) & 0x1;
        uw32(DCR9, 0x40000);
        udelay(1);

        return phy_data;
}


static const struct pci_device_id uli526x_pci_tbl[] = {
        { 0x10B9, 0x5261, PCI_ANY_ID, PCI_ANY_ID, 0, 0, PCI_ULI5261_ID },
        { 0x10B9, 0x5263, PCI_ANY_ID, PCI_ANY_ID, 0, 0, PCI_ULI5263_ID },
        { 0, }
};
MODULE_DEVICE_TABLE(pci, uli526x_pci_tbl);

static SIMPLE_DEV_PM_OPS(uli526x_pm_ops, uli526x_suspend, uli526x_resume);

static struct pci_driver uli526x_driver = {
        .name           = "uli526x",
        .id_table       = uli526x_pci_tbl,
        .probe          = uli526x_init_one,
        .remove         = uli526x_remove_one,
        .driver.pm      = &uli526x_pm_ops,
};

MODULE_AUTHOR("Peer Chen, peer.chen@uli.com.tw");
MODULE_DESCRIPTION("ULi M5261/M5263 fast ethernet driver");
MODULE_LICENSE("GPL");

module_param(debug, int, 0644);
module_param(mode, int, 0);
module_param(cr6set, int, 0);
MODULE_PARM_DESC(debug, "ULi M5261/M5263 enable debugging (0-1)");
MODULE_PARM_DESC(mode, "ULi M5261/M5263: Bit 0: 10/100Mbps, bit 2: duplex, bit 8: HomePNA");

/*      Description:
 *      when user used insmod to add module, system invoked init_module()
 *      to register the services.
 */

static int __init uli526x_init_module(void)
{

        ULI526X_DBUG(0, "init_module() ", debug);

        if (debug)
                uli526x_debug = debug;  /* set debug flag */
        if (cr6set)
                uli526x_cr6_user_set = cr6set;

        switch (mode) {
        case ULI526X_10MHF:
        case ULI526X_100MHF:
        case ULI526X_10MFD:
        case ULI526X_100MFD:
                uli526x_media_mode = mode;
                break;
        default:
                uli526x_media_mode = ULI526X_AUTO;
                break;
        }

        return pci_register_driver(&uli526x_driver);
}


/*
 *      Description:
 *      when user used rmmod to delete module, system invoked clean_module()
 *      to un-register all registered services.
 */

static void __exit uli526x_cleanup_module(void)
{
        ULI526X_DBUG(0, "uli526x_cleanup_module() ", debug);
        pci_unregister_driver(&uli526x_driver);
}

module_init(uli526x_init_module);
module_exit(uli526x_cleanup_module);