dm9ks.c

dm9000aep linux下驱动程序

  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;
}

#ifndef 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 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*)℞
	u8* rdptr;

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

	db->cont_rx_pkt_cnt=0;
	
	do {
		/*store the value of Memory Data Read address register*/
		MDRAH=ior(db, DM9KS_MDRAH);
		MDRAL=ior(db, DM9KS_MDRAL);
		
		ior(db, DM9KS_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(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);
#ifdef 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++;
#ifdef DBUG /* check RX FIFO pointer */
			u16 MDRAH1, MDRAL1;
			u16 tmp_ptr;
			MDRAH1 = ior(db,DM9KS_MDRAH);
			MDRAL1 = ior(db,DM9KS_MDRAL);
			tmp_ptr = (MDRAH<<8)|MDRAL;
			switch (db->io_mode)
			{
				case DM9KS_BYTE_MODE:
					tmp_ptr += rx.desc.length+4;
					break;
				case DM9KS_WORD_MODE:
					tmp_ptr += ((rx.desc.length+1)/2)*2+4;
					break;
				case DM9KS_DWORD_MODE:
					tmp_ptr += ((rx.desc.length+3)/4)*4+4;
					break;
			}
			if (tmp_ptr >=0x4000)
				tmp_ptr = (tmp_ptr - 0x4000) + 0xc00;
			if (tmp_ptr != ((MDRAH1<<8)|MDRAL1))
				printk("[dm9ks:RX FIFO ERROR\n");
#endif
				
			if (db->cont_rx_pkt_cnt>=CONT_RX_PKT_CNT)
			{
				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);
	while(ior(db, DM9KS_EPCR)&0x1);	/* Wait read complete */
	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);

	/* enable promiscuous mode */
	if (dev->flags & IFF_PROMISC){
		//printk(KERN_INFO "DM9KS:enable promiscuous mode\n");
		iow(db, DM9KS_RXCR, ior(db,DM9KS_RXCR)|(1<<1));
		return;
	}else{
		//printk(KERN_INFO "DM9KS:disable promiscuous mode\n");
		iow(db, DM9KS_RXCR, ior(db,DM9KS_RXCR)&(~(1<<1)));
	}
		
	/* Receive all multicast packets */
	if (dev->flags & IFF_ALLMULTI){
		//printk(KERN_INFO "DM9KS:Pass all multicast\n");
		iow(db, DM9KS_RXCR, ior(db,DM9KS_RXCR)|(1<<3));
	}else{
		//printk(KERN_INFO "DM9KS:Disable pass all multicast\n");
		iow(db, DM9KS_RXCR, ior(db,DM9KS_RXCR)&(~(1<<3)));
	}
	
	/* 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;	 
}

static int mdio_read(struct net_device *dev, int phy_id, int location)
{
	board_info_t *db = (board_info_t *)dev->priv;
	return phy_read(db, location);
}

static void mdio_write(struct net_device *dev, int phy_id, int location, int val)
{
	board_info_t *db = (board_info_t *)dev->priv;
	phy_write(db, location, val);
}

/*
   Read a byte from I/O port
*/
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
*/
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 */
	while(ior(db, DM9KS_EPCR)&0x1);	/* 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 */
	while(ior(db, DM9KS_EPCR)&0x1);	/* Wait read complete */
	iow(db, DM9KS_EPCR, 0x0);	/* Clear phyxcer write command */
}
//====dmfe_ethtool_ops member functions====
static void dmfe_get_drvinfo(struct net_device *dev,
			       struct ethtool_drvinfo *info)
{
	//board_info_t *db = (board_info_t *)dev->priv;
	strcpy(info->driver, DRV_NAME);
	strcpy(info->version, DRV_VERSION);
	sprintf(info->bus_info, "ISA 0x%lx irq=%d",dev->base_addr, dev->irq);
}
static int dmfe_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
	board_info_t *db = (board_info_t *)dev->priv;
	spin_lock_irq(&db->lock);
	mii_ethtool_gset(&db->mii, cmd);
	spin_unlock_irq(&db->lock);
	return 0;
}
static int dmfe_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
{
	board_info_t *db = (board_info_t *)dev->priv;
	int rc;

	spin_lock_irq(&db->lock);
	rc = mii_ethtool_sset(&db->mii, cmd);
	spin_unlock_irq(&db->lock);
	return rc;
}
/*
* Check the link state
*/
static u32 dmfe_get_link(struct net_device *dev)
{
	board_info_t *db = (board_info_t *)dev->priv;
	return mii_link_ok(&db->mii);
}

/*
* Reset Auto-negitiation
*/
static int dmfe_nway_reset(struct net_device *dev)
{
	board_info_t *db = (board_info_t *)dev->priv;
	return mii_nway_restart(&db->mii);
}
/*
* Get RX checksum offload state
*/
static uint32_t dmfe_get_rx_csum(struct net_device *dev)
{
	board_info_t *db = (board_info_t *)dev->priv;
	return db->rx_csum;
}
/*
* Get TX checksum offload state
*/
static uint32_t dmfe_get_tx_csum(struct net_device *dev)
{
	return (dev->features & NETIF_F_HW_CSUM) != 0;
}
/* 
* Enable/Disable RX checksum offload
*/
static int dmfe_set_rx_csum(struct net_device *dev, uint32_t data)
{
#ifdef CHECKSUM
	board_info_t *db = (board_info_t *)dev->priv;
	db->rx_csum = data;

	if(netif_running(dev)) {
		dmfe_stop(dev);
		dmfe_open(dev);
	} else
		dmfe_init_dm9000(dev);
#else
	printk(KERN_ERR "DM9:Don't support checksum\n");
#endif
	return 0;
}
/* 
* Enable/Disable TX checksum offload
*/
static int dmfe_set_tx_csum(struct net_device *dev, uint32_t data)
{
#ifdef CHECKSUM
	if (data)
		dev->features |= NETIF_F_HW_CSUM;
	else
		dev->features &= ~NETIF_F_HW_CSUM;
#else
	printk(KERN_ERR "DM9:Don't support checksum\n");
#endif

	return 0;
}
//=========================================
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,28)  /* for kernel 2.4.28 */
static struct ethtool_ops dmfe_ethtool_ops = {
	.get_drvinfo		= dmfe_get_drvinfo,
	.get_settings		= dmfe_get_settings,
	.set_settings		= dmfe_set_settings,
	.get_link			= dmfe_get_link,
	.nway_reset		= dmfe_nway_reset,
	.get_rx_csum		= dmfe_get_rx_csum,
	.set_rx_csum		= dmfe_set_rx_csum,
	.get_tx_csum		= dmfe_get_tx_csum,
	.set_tx_csum		= dmfe_set_tx_csum,
};
#endif

#ifdef MODULE

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Davicom DM9000A/DM9010 ISA/uP Fast Ethernet Driver");
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0) 
MODULE_PARM(mode, "i");
MODULE_PARM(irq, "i");
MODULE_PARM(iobase, "i");
#else
module_param(mode, int, 0);
module_param(irq, int, 0);
module_param(iobase, int, 0);
#endif           
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 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_probe();
	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 __exit 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