dev_kfree_skb(skb);	/* Re-enable interrupt */	iow(db, DM9KS_IMR, DM9KS_REGFF);	return 0;}/*  Stop the interface.  The interface is stopped when it is brought.*/static int dmfe_stop(struct net_device *dev){	board_info_t *db = (board_info_t *)dev->priv;	DMFE_DBUG(0, "dmfe_stop", 0);	/* deleted timer */	del_timer(&db->timer);	netif_stop_queue(dev); 	/* free interrupt */	free_irq(dev->irq, dev);	/* RESET devie */	phy_write(db, 0x00, 0x8000);	/* PHY RESET */	iow(db, DM9KS_GPR, 0x01); 	/* Power-Down PHY */	iow(db, DM9KS_IMR, DM9KS_DISINTR);	/* Disable all interrupt */	iow(db, DM9KS_RXCR, 0x00);	/* Disable RX */	/* Dump Statistic counter */#if FALSE	printk("\nRX FIFO OVERFLOW %lx\n", db->stats.rx_fifo_errors);	printk("RX CRC %lx\n", db->stats.rx_crc_errors);	printk("RX LEN Err %lx\n", db->stats.rx_length_errors);	printk("RESET %x\n", db->reset_counter);	printk("RESET: TX Timeout %x\n", db->reset_tx_timeout);	printk("g_TX_nsr %x\n", g_TX_nsr);#endif	return 0;}static void dmfe_tx_done(unsigned long unused){	struct net_device *dev = dmfe_dev;	board_info_t *db = (board_info_t *)dev->priv;	int  nsr;	DMFE_DBUG(0, "dmfe_tx_done()", 0);	#if 0 	if((ior(db, DM9KS_TCR) & 0x01) != 0x01)	{		db->tx_pkt_cnt = 0;		netif_wake_queue(dev);	}#else	nsr = ior(db, DM9KS_NSR);	if(nsr & 0x04) db->tx_pkt_cnt--;	if(nsr & 0x08) db->tx_pkt_cnt--;	if (db->tx_pkt_cnt < 0)	{		DMFE_DBUG(0, "[dmfe_tx_done] tx_pkt_cnt ERROR!!", 0);		printk("[dmfe_tx_done] tx_pkt_cnt ERROR!!\n");		while(ior(db, DM9KS_TCR) & 0x01);		db->tx_pkt_cnt = 0;	}	if (db->Speed == 10)		{if(db->tx_pkt_cnt < 1 ) netif_wake_queue(dev);}	else				{if(db->tx_pkt_cnt < 2 ) netif_wake_queue(dev);}#endifreturn;}/*  DM9000 insterrupt handler  receive the packet to upper layer, free the transmitted packet*/static void dmfe_interrupt(int irq, void *dev_id, struct pt_regs *regs){	struct net_device *dev = dev_id;	board_info_t *db;	int int_status,i;	u8 reg_save;	DMFE_DBUG(0, "dmfe_interrupt()", 0);	/* A real interrupt coming */	db = (board_info_t *)dev->priv;	spin_lock(&db->lock);	/* Save previous register address */	reg_save = inb(db->io_addr);	/* Disable all interrupt */	iow(db, DM9KS_IMR, DM9KS_DISINTR); 	/* Got DM9000A/DM9010 interrupt status */	int_status = ior(db, DM9KS_ISR);		/* Got ISR */	iow(db, DM9KS_ISR, int_status);		/* Clear ISR status */ 		//printk("\n [dmfe_interrupt] int_status %02x ", int_status);	/* Link status change */	if (int_status & DM9KS_LINK_INTR) 	{		netif_stop_queue(dev);		for(i=0; i<500; i++) /*wait link OK, waiting time =0.5s */		{			phy_read(db,0x1);			if(phy_read(db,0x1) & 0x4) /*Link OK*/			{				/* wait for detected Speed */				for(i=0; i<200;i++)					udelay(1000);				/* set media speed */				if(phy_read(db,0)&0x2000) db->Speed =100;				else db->Speed =10;				break;			}			udelay(1000);		}		netif_wake_queue(dev);		//printk("[INTR]i=%d speed=%d\n",i, (int)(db->Speed));		}	/* Trnasmit Interrupt check */	if (int_status & DM9KS_TX_INTR)		dmfe_tx_done(0);		/* Received the coming packet */	if (int_status & DM9KS_RX_INTR) 		dmfe_packet_receive(dev);		if (db->cont_rx_pkt_cnt>=CONT_RX_PKT_CNT)	{		iow(db, DM9KS_IMR, 0xa2);	}	else	{		/* Re-enable interrupt mask */ 		iow(db, DM9KS_IMR, DM9KS_REGFF);	}		/* Restore previous register address */	outb(reg_save, db->io_addr); 	spin_unlock(&db->lock); }/*  Get statistics from driver.*/static struct net_device_stats * dmfe_get_stats(struct net_device *dev){	board_info_t *db = (board_info_t *)dev->priv;	DMFE_DBUG(0, "dmfe_get_stats", 0);	return &db->stats;}/*  Process the upper socket ioctl command*/static int dmfe_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd){	DMFE_DBUG(0, "dmfe_do_ioctl()", 0);	return 0;}/* Our watchdog timed out. Called by the networking layer */static voiddmfe_timeout(struct net_device *dev){	board_info_t *db = (board_info_t *)dev->priv;	DMFE_DBUG(0, "dmfe_TX_timeout()", 0);	printk("TX time-out -- dmfe_timeout().\n");	db->reset_tx_timeout++;	db->stats.tx_errors++;#if FALSE	printk("TX packet count = %d\n", db->tx_pkt_cnt);		printk("TX timeout = %d\n", db->reset_tx_timeout);		printk("22H=0x%02x  23H=0x%02x\n",ior(db,0x22),ior(db,0x23));	printk("faH=0x%02x  fbH=0x%02x\n",ior(db,0xfa),ior(db,0xfb));#endif	dmfe_reset(dev);	}static void dmfe_reset(struct net_device * dev){	board_info_t *db = (board_info_t *)dev->priv;	u8 reg_save;	int i;	/* Save previous register address */	reg_save = inb(db->io_addr);	netif_stop_queue(dev); 	db->reset_counter++;	dmfe_init_dm9000(dev);		db->Speed =10;	for(i=0; i<1000; i++) /*wait link OK, waiting time=1 second */	{		if(phy_read(db,0x1) & 0x4) /*Link OK*/		{			if(phy_read(db,0)&0x2000) db->Speed =100;			else db->Speed =10;			break;		}		udelay(1000);	}		netif_wake_queue(dev);		/* Restore previous register address */	outb(reg_save, db->io_addr);}/*  A periodic timer routine*/static void dmfe_timer(unsigned long data){	struct net_device * dev = (struct net_device *)data;	board_info_t *db = (board_info_t *)dev->priv;	DMFE_DBUG(0, "dmfe_timer()", 0);		if (db->cont_rx_pkt_cnt>=CONT_RX_PKT_CNT)	{		db->cont_rx_pkt_cnt=0;		iow(db, DM9KS_IMR, DM9KS_REGFF);	}	/* Set timer again */	db->timer.expires = DMFE_TIMER_WUT;	add_timer(&db->timer);		return;}#if !defined(CHECKSUM)#define check_rx_ready(a)	((a) == 0x01)#elseinline u8 check_rx_ready(u8 rxbyte){	if (!(rxbyte & 0x01))		return 0;	return ((rxbyte >> 4) | 0x01);}#endif/*  Received a packet and pass to upper layer*/static void dmfe_packet_receive(struct net_device *dev){	board_info_t *db = (board_info_t *)dev->priv;	struct sk_buff *skb;	u8 rxbyte, val;	u16 i, GoodPacket, tmplen = 0, MDRAH, MDRAL;	u32 tmpdata;	rx_t rx;	u16 * ptr = (u16*)&rx;	u8* rdptr;	DMFE_DBUG(0, "dmfe_packet_receive()", 0);	do {		/*store the value of Memory Data Read address register*/		ior(db, DM9KS_MRCMDX);		/* Dummy read */		MDRAH=ior(db, DM9KS_MDRAH);		MDRAL=ior(db, DM9KS_MDRAL);				rxbyte = ior(db, DM9KS_MRCMDX);	/* Got most updated data */		/* packet ready to receive check */		if(!(val = check_rx_ready(rxbyte))) break;		/* A packet ready now  & Get status/length */		GoodPacket = TRUE;		outb(DM9KS_MRCMD, db->io_addr);		/* Read packet status & length */		switch (db->io_mode) 			{			  case DM9KS_BYTE_MODE:  				    *ptr = inb(db->io_data) + 				               (inb(db->io_data) << 8);				    *(ptr+1) = inb(db->io_data) + 					    (inb(db->io_data) << 8);				    break;			  case DM9KS_WORD_MODE:				    *ptr = inw(db->io_data);				    *(ptr+1)    = inw(db->io_data);				    break;			  case DM9KS_DWORD_MODE:				    tmpdata  = inl(db->io_data);				    *ptr = tmpdata;				    *(ptr+1)    = tmpdata >> 16;				    break;			  default:				    break;			}		/* Packet status check */		if (rx.desc.status & 0xbf)		{			GoodPacket = FALSE;			if (rx.desc.status & 0x01) 			{				db->stats.rx_fifo_errors++;				printk("<RX FIFO error>\n");			}			if (rx.desc.status & 0x02) 			{				db->stats.rx_crc_errors++;				printk("<RX CRC error>\n");			}			if (rx.desc.status & 0x80) 			{				db->stats.rx_length_errors++;				printk("<RX Length error>\n");			}			if (rx.desc.status & 0x08)				printk("<Physical Layer error>\n");		}		if (!GoodPacket)		{			// drop this packet!!!			switch (db->io_mode)			{				case DM9KS_BYTE_MODE:			 		for (i=0; i<rx.desc.length; i++)						inb(db->io_data);					break;				case DM9KS_WORD_MODE:					tmplen = (rx.desc.length + 1) / 2;					for (i = 0; i < tmplen; i++)						inw(db->io_data);					break;				case DM9KS_DWORD_MODE:					tmplen = (rx.desc.length + 3) / 4;					for (i = 0; i < tmplen; i++)						inl(db->io_data);					break;			}			continue;/*next the packet*/		}				skb = dev_alloc_skb(rx.desc.length+4);		if (skb == NULL )		{				printk(KERN_INFO "%s: Memory squeeze.\n", dev->name);			/*re-load the value into Memory data read address register*/			iow(db,DM9KS_MDRAH,MDRAH);			iow(db,DM9KS_MDRAL,MDRAL);			return;		}		else		{			/* Move data from DM9000 */			skb->dev = dev;			skb_reserve(skb, 2);			rdptr = (u8*)skb_put(skb, rx.desc.length - 4);						/* Read received packet from RX SARM */			switch (db->io_mode)			{				case DM9KS_BYTE_MODE:			 		for (i=0; i<rx.desc.length; i++)						rdptr[i]=inb(db->io_data);					break;				case DM9KS_WORD_MODE:					tmplen = (rx.desc.length + 1) / 2;					for (i = 0; i < tmplen; i++)						((u16 *)rdptr)[i] = inw(db->io_data);					break;				case DM9KS_DWORD_MODE:					tmplen = (rx.desc.length + 3) / 4;					for (i = 0; i < tmplen; i++)						((u32 *)rdptr)[i] = inl(db->io_data);					break;			}					/* Pass to upper layer */			skb->protocol = eth_type_trans(skb,dev);#if defined(CHECKSUM)			if (val == 0x01)				skb->ip_summed = CHECKSUM_UNNECESSARY;#endif			netif_rx(skb);			dev->last_rx=jiffies;			db->stats.rx_packets++;			db->stats.rx_bytes += rx.desc.length;			db->cont_rx_pkt_cnt++;							if (db->cont_rx_pkt_cnt>=CONT_RX_PKT_CNT)			{				//printk("\n [dmfe_packet_receive] CONT_RX_PKT_CNT OVERFLOW ");				//dmfe_tx_done(0);				break;			}		}				}while((rxbyte & 0x01) == DM9KS_PKT_RDY);	DMFE_DBUG(0, "[END]dmfe_packet_receive()", 0);	}/*  Read a word data from SROM*/static u16 read_srom_word(board_info_t *db, int offset){	iow(db, DM9KS_EPAR, offset);	iow(db, DM9KS_EPCR, 0x4);	udelay(200);	iow(db, DM9KS_EPCR, 0x0);	return (ior(db, DM9KS_EPDRL) + (ior(db, DM9KS_EPDRH) << 8) );}/*  Set DM9000A/DM9010 multicast address*/static void dm9000_hash_table(struct net_device *dev){	board_info_t *db = (board_info_t *)dev->priv;	struct dev_mc_list *mcptr = dev->mc_list;	int mc_cnt = dev->mc_count;	u32 hash_val;	u16 i, oft, hash_table[4];	DMFE_DBUG(0, "dm9000_hash_table()", 0);	/* Set Node address */	for (i = 0, oft = 0x10; i < 6; i++, oft++)		iow(db, oft, dev->dev_addr[i]);	/* Clear Hash Table */	for (i = 0; i < 4; i++)		hash_table[i] = 0x0;	/* broadcast address */	hash_table[3] = 0x8000;	/* the multicast address in Hash Table : 64 bits */	for (i = 0; i < mc_cnt; i++, mcptr = mcptr->next) {		hash_val = cal_CRC((char *)mcptr->dmi_addr, 6, 0) & 0x3f; 		hash_table[hash_val / 16] |= (u16) 1 << (hash_val % 16);	}	/* Write the hash table to MAC MD table */	for (i = 0, oft = 0x16; i < 4; i++) {		iow(db, oft++, hash_table[i] & 0xff);		iow(db, oft++, (hash_table[i] >> 8) & 0xff);	}}/* The little-endian AUTODIN II ethernet CRC calculations.   A big-endian version is also available.   This is slow but compact code.  Do not use this routine for bulk data,   use a table-based routine instead.   This is common code and should be moved to net/core/crc.c.   Chips may use the upper or lower CRC bits, and may reverse and/or invert   them.  Select the endian-ness that results in minimal calculations.*/static unsigned const ethernet_polynomial_le = 0xedb88320U;static inline unsigned ether_crc_le(int length, unsigned char *data){	unsigned int crc = 0xffffffff;  /* Initial value. */	while(--length >= 0) {		unsigned char current_octet = *data++;		int bit;		for (bit = 8; --bit >= 0; current_octet >>= 1) {			if ((crc ^ current_octet) & 1) {				crc >>= 1;			    crc ^= ethernet_polynomial_le;			} else				crc >>= 1;		}	}   	return crc;}/*  Calculate the CRC valude of the Rx packet  flag = 1 : return the reverse CRC (for the received packet CRC)         0 : return the normal CRC (for Hash Table index)*/static unsigned long cal_CRC(unsigned char * Data, unsigned int Len, u8 flag){		u32 crc = ether_crc_le(Len, Data);	if (flag) 		return ~crc;			return crc;	 }/*   Read a byte from I/O port*/static u8 ior(board_info_t *db, int reg){	outb(reg, db->io_addr);	return inb(db->io_data);}/*   Write a byte to I/O port*/static void iow(board_info_t *db, int reg, u8 value){	outb(reg, db->io_addr);	outb(value, db->io_data);}/*   Read a word from phyxcer*/static u16 phy_read(board_info_t *db, int reg){	/* Fill the phyxcer register into REG_0C */	iow(db, DM9KS_EPAR, DM9KS_PHY | reg);	iow(db, DM9KS_EPCR, 0xc); 	/* Issue phyxcer read command */	udelay(100);			/* Wait read complete */	iow(db, DM9KS_EPCR, 0x0); 	/* Clear phyxcer read command */	/* The read data keeps on REG_0D & REG_0E */	return ( ior(db, DM9KS_EPDRH) << 8 ) | ior(db, DM9KS_EPDRL);	}/*   Write a word to phyxcer*/static void phy_write(board_info_t *db, int reg, u16 value){	/* Fill the phyxcer register into REG_0C */	iow(db, DM9KS_EPAR, DM9KS_PHY | reg);	/* Fill the written data into REG_0D & REG_0E */	iow(db, DM9KS_EPDRL, (value & 0xff));	iow(db, DM9KS_EPDRH, ( (value >> 8) & 0xff));	iow(db, DM9KS_EPCR, 0xa);	/* Issue phyxcer write command */	udelay(500);			/* Wait write complete */	iow(db, DM9KS_EPCR, 0x0);	/* Clear phyxcer write command */}#ifdef MODULEMODULE_LICENSE("GPL");MODULE_DESCRIPTION("Davicom DM9000A/DM9010 ISA/uP Fast Ethernet Driver");MODULE_PARM(mode, "i");MODULE_PARM(irq, "i");MODULE_PARM(iobase, "i");MODULE_PARM_DESC(mode,"Media Speed, 0:10MHD, 1:10MFD, 4:100MHD, 5:100MFD");MODULE_PARM_DESC(irq,"EtherLink IRQ number");MODULE_PARM_DESC(iobase, "EtherLink I/O base address");/* Description:    when user used insmod to add module, system invoked init_module()   to initilize and register.*/int init_module(void){	switch(mode) {		case DM9KS_10MHD:		case DM9KS_100MHD:		case DM9KS_10MFD:		case DM9KS_100MFD:			media_mode = mode;			break;		default:			media_mode = DM9KS_AUTO;	}	dmfe_dev = dmfe_probe1();	if(IS_ERR(dmfe_dev))		return PTR_ERR(dmfe_dev);	return 0;}/* Description:    when user used rmmod to delete module, system invoked clean_module()   to  un-register DEVICE.*/void cleanup_module(void){	struct net_device *dev = dmfe_dev;	DMFE_DBUG(0, "clean_module()", 0);	unregister_netdev(dmfe_dev);	release_region(dev->base_addr, 2);//#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)	kfree(dev);//#else//	free_netdev(dev);//#endif		DMFE_DBUG(0, "clean_module() exit", 0);}#endif