dm9sw.c

网卡芯片DM9003在linux下的驱动程序。

		if(!(val = check_rx_ready(rxbyte))) break;

		/* A packet ready now  & Get status/length */
		outb(DM9KS_MRCMD, db->io_addr);

		/* Read packet status & length */
		db->MoveData(db,ptr,4,0);

		 /* Packet status check */
		if (rx_desc.desc.status & 0xbf)
		{
			db->stats.rx_errors++;
			if (rx_desc.desc.status & RX_FIFO_over)
				db->stats.rx_fifo_errors++;
			if (rx_desc.desc.status & RX_CRCErr)
				db->stats.rx_crc_errors++;

			//drop this packet
 			db->MoveData(db, NULL, rx_desc.desc.length, 0);
			db->stats.rx_dropped++;
			goto rx_next;

		}
		skb = dev_alloc_skb(rx_desc.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);
                }else{
                        /* Move data from DM9000 */
                        skb->dev = dev;
                        skb_reserve(skb, 2);
                        rdptr = (u8*)skb_put(skb, rx_desc.desc.length - 4);

                        db->MoveData(db, rdptr, rx_desc.desc.length, 0);
                        /* Pass to upper layer */
                        skb->protocol = eth_type_trans(skb,dev);
#if defined(CHECKSUM)
                        if (!(rx_desc.desc.rxbyte & 0xe0))
                                skb->ip_summed = CHECKSUM_UNNECESSARY;
#endif
                        netif_rx(skb);
                        dev->last_rx=jiffies;
                        db->stats.rx_packets++;
                        db->stats.rx_bytes += rx_desc.desc.length;

			rx++;
                }

rx_next:
		if (!rx_work--)
			break;
	}//end of while()

	dev->quota -= rx;
	*budget -= rx;

	/* if we did not reach work limit, then we're done with
	 * this round of polling
	 */
	if (rx_work) 
	{
		if (ior(db, DM9KS_ISR) & ISR_RX_coming)
			goto rx_status_loop;

		local_irq_disable();
		iow(db, DM9KS_IMR, DM9KS_REGFF);
		__netif_rx_complete(dev);
		local_irq_enable();

		return 0;/* done */
	}

	return 1;/* not done */	
}
#endif

/*
  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 void
dmfe_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;

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

	netif_stop_queue(dev); 
	db->reset_counter++;
	dmfe_init_dm9000(dev);

	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);

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

#ifndef NAPI
/*
 * 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 MDRAH, MDRAL;

	rx_t rx;

	u8 * ptr = (u8*)℞
	u8* rdptr;

	DMFE_DBUG(0, "dmfe_packet_receive()", 0);

	do {
		/*store the value of Memory Data Read address register*/
		MDRAH=ior(db, DM9KS_MDRAH);
		MDRAL=ior(db, DM9KS_MDRAL);
	
		rxbyte =ior(db, DM9KS_MRCMDX);
    		rxbyte =ior(db, DM9KS_ISR);     /* Dummy read */
   		rxbyte =ior(db, DM9KS_MRCMDX);  /* read the byte of packet ready */
	
		/* packet ready to receive check */
		if(!(val = check_rx_ready(rxbyte))) break;

		/* A packet ready now  & Get status/length */
		outb(DM9KS_MRCMD, db->io_addr);

		/* Read packet status & length */
		db->MoveData(db,ptr,4,0);

		/* Packet status check */
		if (rx.desc.status & 0xbf)
    		{
			//printk("DM9013:RX ERROR\n");
       			db->stats.rx_errors++;
        		if (rx.desc.status & RX_FIFO_over)
        			db->stats.rx_fifo_errors++;
        		if (rx.desc.status & RX_CRCErr)
            			db->stats.rx_crc_errors++;
                        
        		//drop this packet
        		db->MoveData(db, NULL, rx.desc.length, 0);
        		db->stats.rx_dropped++;
        		continue;

     		}
		
		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);
			
			db->MoveData(db, rdptr, rx.desc.length, 0);
			/* 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++;

		}
			
	}while((rxbyte & 0x01) == DM9KS_PKT_RDY);
	DMFE_DBUG(0, "[END]dmfe_packet_receive()", 0);
	
}
#endif
/*
 * 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, EPCR_Read);
	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);
	}
}

/*
  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, int port)
{
	reg = (port<<6) | reg;
	/* Fill the phyxcer register into REG_0C */
	iow(db, 0xc, reg);

	iow(db, 0xb, 0x8); 	/* Clear phyxcer read command */
	iow(db, 0xb, 0xc); 	/* Issue phyxcer read command */
	iow(db, 0xb, 0x8); 	/* Clear phyxcer read command */
	do {
		if (!(ior(db,0xb) & 0x1))
			break;
	}while(1);
	/* 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, int port)
{

	reg = (port<<6) | reg;
	/* Fill the phyxcer register into REG_0C */
	iow(db, 0xc, reg);

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

	iow(db, 0xb, 0x8);	/* Clear phyxcer write command */
	iow(db, 0xb, 0xa);	/* Issue phyxcer write command */
	iow(db, 0xb, 0x8);	/* Clear phyxcer write command */
	do {
		if (!(ior(db,0xb) & 0x1))
			break;
	}while(1);
}

/*
	selec 0:input(RX)	1:output(TX)
	if selec=0, move data from FIFO to data_ptr 
	if selec=1, move data from data_ptr to FIFO
*/
static void move8(board_info_t *db,unsigned char *data_ptr, int leng, int selec)
{
	int i;
	if (selec)
		for (i=0; i<leng; i++)
			outb((data_ptr[i] & 0xff), db->io_data);
	else
		for (i=0; i<leng; i++)
			data_ptr[i] = inb(db->io_data);
}	

static void move16(board_info_t *db,unsigned char *data_ptr, int leng, int selec)
{
	int i, tmpleng;
	tmpleng = (leng + 1) >> 1;
	if (selec)
	{
		for (i=0; i<tmpleng; i++)
			outw(((u16 *)data_ptr)[i], db->io_data);
	}
	else
		for (i=0; i<tmpleng; i++)
			((u16 *)data_ptr)[i] = inw(db->io_data);
}	

static void move32(board_info_t *db,unsigned char *data_ptr, int leng, int selec)
{
	int i, tmpleng;
	tmpleng = (leng + 3) >> 2;
	if (selec)
		for (i=0; i<tmpleng; i++)
			outl(((u32 *)data_ptr)[i], db->io_data);
	else
		for (i=0; i<tmpleng; i++)
			((u32 *)data_ptr)[i]=inl(db->io_data);
}	

#ifdef MODULE

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Davicom DM9013 ISA/uP Fast Ethernet Driver");
MODULE_PARM(irq, "i");
MODULE_PARM(iobase, "i");
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)
{
	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