dm9000x.c

dm9000以太网卡芯片linux驱动程序

		/* Set TX length to DM9000 */
		iow(db, 0xfc, skb->len & 0xff);
		iow(db, 0xfd, (skb->len >> 8) & 0xff);

		/* Issue TX polling command */
		iow(db, 0x2, 0x1);		/* Cleared after TX complete */

		dev->trans_start = jiffies;	/* saved the time stamp */
		
	} else {
		/* Second packet */
		db->tx_pkt_cnt++;
		db->queue_pkt_len = skb->len;
	}
 
	/* free this SKB */
	dev_kfree_skb(skb);

	/* Re-enable resource check */
	if (db->tx_pkt_cnt == 1)
              netif_wake_queue(dev); 
		
	/* Re-enable interrupt*/ 
	iow(db,0xff,0x83);
	
	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, 0x1f, 0x01); 		/* Power-Down PHY */
	iow(db, 0xff, 0x80);		/* Disable all interrupt */
	iow(db, 0x05, 0x00);		/* Disable RX */

	MOD_DEC_USE_COUNT;

	/* 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("RX LEN < 64byte %x\n", db->runt_length_counter);
	printk("RX LEN > 1514byte %x\n", db->long_length_counter);
	printk("RESET %x\n", db->reset_counter);
	printk("RESET: TX Timeout %x\n", db->reset_tx_timeout);
	printk("RESET: RX Status Wrong %x\n", db->reset_rx_status);
#endif

	return 0;
}

/*
  DM9102 insterrupt handler
  receive the packet to upper layer, free the transmitted packet
*/

void dmfe_tx_done(struct net_device *dev, board_info_t *db)
{
		int tx_status = ior(db, 0x01);	/* Got TX status */
		
		if (tx_status & 0xc) {
			/* One packet sent complete */
			db->tx_pkt_cnt--;
			dev->trans_start = 0;
			db->stats.tx_packets++;

			/* Queue packet check & send */
			if (db->tx_pkt_cnt > 0) {
				iow(db, 0xfc, db->queue_pkt_len & 0xff);
				iow(db, 0xfd, (db->queue_pkt_len >> 8) & 0xff);
				iow(db, 0x2, 0x1);
				dev->trans_start = jiffies;
			}

			netif_wake_queue(dev); 
		}
}

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;
	u8 reg_save;

	DMFE_DBUG(0, "dmfe_interrupt()", 0);

	if (!dev) {
		DMFE_DBUG(1, "dmfe_interrupt() without DEVICE arg", 0);
		return;
	}

	/* A real interrupt coming */
	db = (board_info_t *)dev->priv;
	spin_lock(&db->lock);

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

	/* Disable all interrupt */
	iow(db, 0xff, 0x80); 

	/* Got DM9000 interrupt status */
	int_status = ior(db, 0xfe);		/* Got ISR */
	iow(db, 0xfe, int_status);		/* Clear ISR status */ 

	/* Received the coming packet */
	if (int_status & DM9000_RX_INTR) 
		tasklet_schedule(&dmfe_rx_tasklet);

	/* Trnasmit Interrupt check */
	if (int_status & DM9000_TX_INTR)
		dmfe_tx_done(dev,db);
		
	/* Re-enable interrupt mask */ 
	iow(db, 0xff, 0x83);

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

	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;
}

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

	DMFE_DBUG(0, "dmfe_timer()", 0);

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

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

	/* DM9000 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;
		dmfe_init_dm9000(dev);
		netif_wake_queue(dev);
	}

	/* Auto Sense Media mode policy:
		FastEthernet NIC: don't need to do anything.
		Media Force mode: don't need to do anything.
		HomeRun/LongRun NIC and AUTO_Mode:
			INT_MII not link, select EXT_MII
			EXT_MII not link, select INT_MII
	 */
	if ( (db->nic_type != FASTETHER_NIC) && (db->op_mode & DM9000_AUTO) ) {
		tmp_reg = ior(db, 0x01);	/* Got link status */
		if ( !(tmp_reg & 0x40) ) { 	/* not link */
			db->reg0 ^= 0x80;
			iow(db, 0x00, db->reg0);
		}
	}

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

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

/*
  Received a packet and pass to upper layer
*/
static void dmfe_packet_receive(unsigned long unused)
{
	struct net_device *dev = dmfe_dev;
	board_info_t *db = (board_info_t *)dev->priv;
	struct sk_buff *skb;
	u8 rxbyte, *rdptr;
	u16 i, RxStatus, RxLen, GoodPacket, tmplen;
	u32 tmpdata;
 
	/* Check packet ready or not */
	do {
		ior(db, 0xf0);			/* Dummy read */
		rxbyte = inb(db->io_data);	/* Got most updated data */

		/* Status check: this byte must be 0 or 1 */
		if (rxbyte > DM9000_PKT_RDY) {
			iow(db, 0x05, 0x00);	/* Stop Device */
			iow(db, 0xfe, 0x80);	/* Stop INT request */
			db->device_wait_reset = TRUE; 
			db->reset_rx_status++;
		}

		/* packet ready to receive check */
		if (rxbyte == DM9000_PKT_RDY) {
			/* A packet ready now  & Get status/length */
			GoodPacket = TRUE;
			outb(0xf2, db->ioaddr);
			
			if (db->io_mode == DM9000_BYTE_MODE) {
				/* Byte mode */
				RxStatus = inb(db->io_data)+(inb(db->io_data) << 8);
				RxLen    = inb(db->io_data)+(inb(db->io_data) << 8);
			} else if (db->io_mode == DM9000_WORD_MODE) {
				/* Word mode */
				RxStatus = inw(db->io_data);
				RxLen    = inw(db->io_data);
			} else {
				/* DWord mode */
				tmpdata  = inl(db->io_data);
				RxStatus = tmpdata;
				RxLen	 = tmpdata >> 16;
			} 

			/* Packet Status check */
			if (RxLen < 0x40) { 
				GoodPacket = FALSE; 
				db->runt_length_counter++; 
			}
			
			if (RxLen > DM9000_PKT_MAX) { 
				printk("<DM9000> RST: RX Len:%x\n", RxLen);
				db->device_wait_reset = TRUE; 
				db->long_length_counter++; 
			}
			
			if (RxStatus & 0xbf00) {
				GoodPacket = FALSE;
				if (RxStatus & 0x100) 
					db->stats.rx_fifo_errors++;
				if (RxStatus & 0x200) 
					db->stats.rx_crc_errors++;
				if (RxStatus & 0x8000) 
					db->stats.rx_length_errors++;
			}

			/* Move data from DM9000 */
			if (!db->device_wait_reset) {
				if ( GoodPacket && ((skb = dev_alloc_skb(RxLen + 4)) != NULL ) ) {
					skb->dev = dev;
					skb_reserve(skb, 2);
					rdptr = (u8 *) skb_put(skb, RxLen-4);
					
					/* Read received packet from RX SARM */
					if (db->io_mode == DM9000_BYTE_MODE) {
						/* Byte mode */
						for (i=0; i<RxLen; i++)
							rdptr[i]=inb(db->io_data);
					} else if (db->io_mode == DM9000_WORD_MODE) {
						/* Word mode */
						tmplen = (RxLen + 1) / 2;
						for (i = 0; i < tmplen; i++)
							((u16 *)rdptr)[i] = inw(db->io_data);
					} else {
						/* DWord mode */
						tmplen = (RxLen + 3) / 4;
						for (i = 0; i < tmplen; i++)
							((u32 *)rdptr)[i] = inl(db->io_data);
					} 
					
					/* Pass to upper layer */
					skb->protocol = eth_type_trans(skb,dev);
					netif_rx(skb);
					db->stats.rx_packets++; 
					
				} else {
					/* Without buffer or error packet */
					if (db->io_mode == DM9000_BYTE_MODE) {
						/* Byte mode */
						for (i = 0; i < RxLen; i++)
							inb(db->io_data);
					} else if (db->io_mode == DM9000_WORD_MODE) {
						/* Word mode */
						printk("0");
						tmplen = (RxLen + 1) / 2;
						for (i = 0; i < tmplen; i++)
							inw(db->io_data);
					} else {
						/* DWord mode */
						tmplen = (RxLen + 3) / 4;
						for (i = 0; i < tmplen; i++)
							inl(db->io_data);
					} 
				}
			}
		}
	}while(rxbyte == DM9000_PKT_RDY && !db->device_wait_reset);
}

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

/*
  Set DM9000 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->ioaddr);
	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->ioaddr);
	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, 0xc, DM9000_PHY | reg);

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

	/* The read data keeps on REG_0D & REG_0E */
	return ( ior(db, 0xe) << 8 ) | ior(db, 0xd);
}

/*
   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, 0xc, DM9000_PHY | reg);

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

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

#ifdef MODULE

    MODULE_AUTHOR("Sten Wang, [e-mail]");
    MODULE_DESCRIPTION("Davicom DM9000 ISA/uP Fast Ethernet Driver");
    MODULE_PARM(debug, "i");
    MODULE_PARM(mode, "i");
    MODULE_PARM(reg5, "i");
    MODULE_PARM(reg9, "i");
    MODULE_PARM(rega, "i");
    MODULE_PARM(nfloor, "i");

/* Description: 
   when user used insmod to add module, system invoked init_module()
   to initilize and register.
*/
int init_module(void)
{
	DMFE_DBUG(0, "init_module() ", debug);

	if (debug) 
		dmfe_debug = debug;   /* set debug flag */

	switch(mode) {
		case DM9000_10MHD:
		case DM9000_100MHD:
		case DM9000_10MFD:
		case DM9000_100MFD:
		case DM9000_1M_HPNA:
			media_mode = mode;
			break;
		default:
			media_mode = DM9000_AUTO;
	}

	nfloor = (nfloor > 15) ? 0:nfloor;

	return dmfe_probe(0);              /* search board and register */
}

/* Description: 
   when user used rmmod to delete module, system invoked clean_module()
   to  un-register DEVICE.
*/
void cleanup_module(void)
{
	board_info_t * db;

	DMFE_DBUG(0, "clean_module()", 0);

	unregister_netdev(dmfe_dev);
	db = (board_info_t *)dmfe_dev->priv;
	release_region(dmfe_dev->base_addr, 2);
	kfree(db);		/* free board information */
	kfree(dmfe_dev);	/* free device structure */
	
	DMFE_DBUG(0, "clean_module() exit", 0);
}

#endif  /* MODULE */