dm9k8.c

DM9000的linux驱动源代码：Linux Base Driver for DM9008A adapter Version 1.0

	printk("RESET: TX Timeout %x\n", db->reset_tx_timeout);
#endif

	return 0;
}

static void dm9K8_tx_done(unsigned long unused)
{
	struct net_device *dev = dm9K8_dev;
	board_info_t *db = (board_info_t *)dev->priv;
	int  nsr;

	DM9K8_DBUG(0, "dm9K8_tx_done()", 0);
	
	nsr = ior(db, DM9K8_NSR);
	if(nsr & 0x04) db->tx_pkt_cnt--;
	if(nsr & 0x08) db->tx_pkt_cnt--;
	if(nsr & 0x0c) netif_wake_queue(dev);
	
	return;
}

/*
  DM9K8 insterrupt handler
  receive the packet to upper layer, free the transmitted packet
*/
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
static void dm9K8_interrupt(int irq, void *dev_id, struct pt_regs *regs)
#else
static irqreturn_t dm9K8_interrupt(int irq, void *dev_id, struct pt_regs *regs)
#endif
{
	struct net_device *dev = dev_id;
	board_info_t *db;
	int int_status;
	u8 reg_save;

	DM9K8_DBUG(0, "dm9K8_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, DM9K8_IMR, DM9K8_DISINTR); 

	/* Got DM9K8A/DM9010 interrupt status */
	int_status = ior(db, DM9K8_ISR);		/* Got ISR */
	iow(db, DM9K8_ISR, int_status);		/* Clear ISR status */ 

	/* Link status change */
	if (int_status & DM9K8_LINK_INTR) 
	{
		if(ior(db,1)&0x40) /* link OK */
		{
			/* Link partner not N-way able  */
			if ((!(phy_read(db,6)&0x01))&&((ior(db,1)&0xC0)==0x40))
			{ 
				phy_write(db,0,0); 
				db->nway=0;
			}
		}
		db->link_change =1;
	}

	/* Received the coming packet */
	if (int_status & DM9K8_RX_INTR) 
		dm9K8_packet_receive(dev);

	/* Trnasmit Interrupt check */
	if (int_status & DM9K8_TX_INTR)
		tasklet_schedule(&dm9K8_tx_tasklet);

	/* Re-enable interrupt mask */ 
	iow(db, DM9K8_IMR, DM9K8_REGFF);

	
	/* Restore previous register address */
	outb(reg_save, db->io_addr); 

	spin_unlock(&db->lock);
	return; 
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,5,0)
	return IRQ_HANDLED;
#endif
}

/*
  Get statistics from driver.
*/
static struct net_device_stats * dm9K8_get_stats(struct net_device *dev)
{
	board_info_t *db = (board_info_t *)dev->priv;
	DM9K8_DBUG(0, "dm9K8_get_stats", 0);
	return &db->stats;
}

/*
  Process the upper socket ioctl command
*/
static int dm9K8_do_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
	DM9K8_DBUG(0, "dm9K8_do_ioctl()", 0);
	return 0;
}

/*
  A periodic timer routine
  Dynamic media sense, allocated Rx buffer...
*/
static void dm9K8_timer(unsigned long data)
{
	struct net_device *dev = (struct net_device *)data;
	board_info_t *db = (board_info_t *)dev->priv;
	u8 reg_save,reg1;
	u16 phy_reg6;

	
	DM9K8_DBUG(0, "dm9K8_timer()", 0);

	/* Save previous register address */
	reg_save = inb(db->io_addr);

	/* TX timeout check */
	if (dev->trans_start && ((jiffies-dev->trans_start)>DM9K8_TX_TIMEOUT)) {
		db->device_wait_reset = 1;
		db->reset_tx_timeout++;
	} 

	if (db->link_change)
	{
		reg1 = ior(db,1);
		if(db->nway==0 &&(!(reg1&0x40))) 
		{	
			/* Enable AUTO-negotiation */
			phy_write(db,4,0x61);
			phy_write(db,0,0x1200);	
		}
		if((reg1=ior(db,1))&0x40) /* link OK */
		{
			phy_reg6 = phy_read(db,6);
			/* Link partner not N-way able  */
			if ((!(phy_reg6&0x01))&&((reg1&0xC0)==0x40) && db->nway)
			{ 
				phy_write(db,0,0); 
				db->nway=0;
			}
			
			if(db->nway==0 && (reg1&0x80))
			{
				db->device_wait_reset=1;
				db->nway=1;
			}
		}
		db->link_change=0;
	}	

	/* DM9008A dynamic RESET check and do */
	if (db->device_wait_reset) {
		netif_stop_queue(dev); 
		db->reset_counter++;
		db->device_wait_reset = 0;
		dev->trans_start = 0;
		dm9K8_init(dev);
		netif_wake_queue(dev);
	}


	/* Restore previous register address */
	outb(reg_save, db->io_addr);

	/* Set timer again */
	db->timer.expires = DM9K8_TIMER_WUT;
	add_timer(&db->timer);

}

#if !defined(CHECKSUM)
#define check_rx_ready(a)	((a) == 0x01)
#else
inline 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 dm9K8_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;

	rx_t rx;

	u16 * ptr = (u16*)&rx;
	u8* rdptr;

	DM9K8_DBUG(0, "dm9K8_packet_receive()", 0);

	do {
		/*store the value of Memory Data Read address register*/
		MDRAH=ior(db, DM9K8_MDRAH);
		MDRAL=ior(db, DM9K8_MDRAL);
		
		ior(db, DM9K8_MRCMDX);		/* Dummy read */
		rxbyte = inb(db->io_data);	/* 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(DM9K8_MRCMD, db->io_addr);

		/* Read packet status & length */
		switch (db->io_mode) 
			{
			  case DM9K8_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 DM9K8_WORD_MODE:
				    *ptr = inw(db->io_data);
				    *(ptr+1)    = inw(db->io_data);
				    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 DM9K8_BYTE_MODE:
			 		for (i=0; i<rx.desc.length; i++)
						inb(db->io_data);
					break;
				case DM9K8_WORD_MODE:
					tmplen = (rx.desc.length + 1) / 2;
					for (i = 0; i < tmplen; i++)
						inw(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,DM9K8_MDRAH,MDRAH);
			iow(db,DM9K8_MDRAL,MDRAL);
			return;
		}
		else
		{
			/* Move data from DM9008A */
			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 DM9K8_BYTE_MODE:
			 		for (i=0; i<rx.desc.length; i++)
						rdptr[i]=inb(db->io_data);
					break;
				case DM9K8_WORD_MODE:
					tmplen = (rx.desc.length + 1) / 2;
					for (i = 0; i < tmplen; i++)
						((u16 *)rdptr)[i] = inw(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);
			db->stats.rx_packets++;
			db->stats.rx_bytes += rx.desc.length;
		}
			
	}while((rxbyte & 0x01) == DM9K8_PKT_RDY);
	
}

/*
  Read a word data from SROM
*/
static u16 read_srom_word(board_info_t *db, int offset)
{
	iow(db, DM9K8_EPAR, offset);
	iow(db, DM9K8_EPCR, 0x4);
	udelay(200);
	iow(db, DM9K8_EPCR, 0x0);
	return (ior(db, DM9K8_EPDRL) + (ior(db, DM9K8_EPDRH) << 8) );
}

/*
  Set DM9008A multicast address
*/
static void dm9K8_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];

	DM9K8_DBUG(0, "dm9K8_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);
	}
}

/*
  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, DM9K8_EPAR, DM9K8_PHY | reg);

	iow(db, DM9K8_EPCR, 0xc); 	/* Issue phyxcer read command */
	udelay(100);			/* Wait read complete */
	iow(db, DM9K8_EPCR, 0x0); 	/* Clear phyxcer read command */

	/* The read data keeps on REG_0D & REG_0E */
	return ( ior(db, DM9K8_EPDRH) << 8 ) | ior(db, DM9K8_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, DM9K8_EPAR, DM9K8_PHY | reg);

	/* Fill the written data into REG_0D & REG_0E */
	iow(db, DM9K8_EPDRL, (value & 0xff));
	iow(db, DM9K8_EPDRH, ( (value >> 8) & 0xff));

	iow(db, DM9K8_EPCR, 0xa);	/* Issue phyxcer write command */
	udelay(500);			/* Wait write complete */
	iow(db, DM9K8_EPCR, 0x0);	/* Clear phyxcer write command */
}


#ifdef MODULE

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Bill, [e-mail]");
MODULE_DESCRIPTION("Davicom DM9008A 10M ONLY Ethernet Driver");
MODULE_PARM(mode, "i");
MODULE_PARM(irq, "i");
MODULE_PARM(iobase, "i");
MODULE_PARM_DESC(mode,"Media Speed, 0:10MHD, 1:10MFD");
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 DM9K8_10MHD:
		/*case DM9K8_100MHD:*/
		case DM9K8_10MFD:
		/*case DM9K8_100MFD:*/
			media_mode = mode;
			break;
		default:
			media_mode = DM9K8_AUTO;
	}
	dm9K8_dev = dm9K8_probe1();
	if(IS_ERR(dm9K8_dev))
		return PTR_ERR(dm9K8_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 = dm9K8_dev;
	DM9K8_DBUG(0, "clean_module()", 0);

	unregister_netdev(dm9K8_dev);
	release_region(dev->base_addr, 2);
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)
	kfree(dev);
#else
	free_netdev(dev);
#endif
	
	DM9K8_DBUG(0, "clean_module() exit", 0);
}
#endif