cs8900.c

cs8900a 的LINUX下的网卡驱动程序

				priv->stats.rx_errors += missed;
				priv->stats.rx_missed_errors += missed;
			}
			if ((RegContent (status) & TxUnderrun)) {
				priv->stats.tx_errors++;
				priv->stats.tx_fifo_errors++;

				priv->txlen = 0;
				netif_wake_queue (dev);
			}
			/* FIXME: if Rdy4Tx, transmit last sent packet (if any) */
			break;

		case TxCOL:
			priv->stats.collisions += ColCount (cs8900_read (dev,PP_TxCOL));
			break;

		case RxMISS:
			status = MissCount (cs8900_read (dev,PP_RxMISS));
			priv->stats.rx_errors += status;
			priv->stats.rx_missed_errors += status;
			break;
		}
	}
	return IRQ_RETVAL(handled);
}

static void cs8900_transmit_timeout (struct net_device *dev)
{
	cs8900_t *priv = (cs8900_t *) dev->priv;
	priv->stats.tx_errors++;
	priv->stats.tx_heartbeat_errors++;
	priv->txlen = 0;
	netif_wake_queue (dev);
}

static int cs8900_start (struct net_device *dev)
{
	int result;

#if defined(CONFIG_ARCH_SMDK2410)|defined(CONFIG_ARCH_SBC2440)
	set_irq_type(dev->irq, IRQT_RISING);

	/* enable the ethernet controller */
	cs8900_set (dev,PP_RxCFG,RxOKiE | BufferCRC | CRCerroriE | RuntiE | ExtradataiE);
	cs8900_set (dev,PP_RxCTL,RxOKA | IndividualA | BroadcastA);
	cs8900_set (dev,PP_TxCFG,TxOKiE | Out_of_windowiE | JabberiE);
	cs8900_set (dev,PP_BufCFG,Rdy4TxiE | RxMissiE | TxUnderruniE | TxColOvfiE | MissOvfloiE);
	cs8900_set (dev,PP_LineCTL,SerRxON | SerTxON);
	cs8900_set (dev,PP_BusCTL,EnableRQ);

#ifdef FULL_DUPLEX
	cs8900_set (dev,PP_TestCTL,FDX);
#endif	/* #ifdef FULL_DUPLEX */
	udelay(200);	
	/* install interrupt handler */
	if ((result = request_irq (dev->irq, &cs8900_interrupt, 0, dev->name, dev)) < 0) {
		printk ("%s: could not register interrupt %d\n",dev->name, dev->irq);
		return (result);
	}
#else
	
	/* install interrupt handler */
	if ((result = request_irq (dev->irq, &cs8900_interrupt, 0, dev->name, dev)) < 0) {
		printk ("%s: could not register interrupt %d\n",dev->name, dev->irq);
		return (result);
	}

	set_irq_type(dev->irq, IRQT_RISING);

	/* enable the ethernet controller */
	cs8900_set (dev,PP_RxCFG,RxOKiE | BufferCRC | CRCerroriE | RuntiE | ExtradataiE);
	cs8900_set (dev,PP_RxCTL,RxOKA | IndividualA | BroadcastA);
	cs8900_set (dev,PP_TxCFG,TxOKiE | Out_of_windowiE | JabberiE);
	cs8900_set (dev,PP_BufCFG,Rdy4TxiE | RxMissiE | TxUnderruniE | TxColOvfiE | MissOvfloiE);
	cs8900_set (dev,PP_LineCTL,SerRxON | SerTxON);
	cs8900_set (dev,PP_BusCTL,EnableRQ);

#ifdef FULL_DUPLEX
	cs8900_set (dev,PP_TestCTL,FDX);
#endif	/* #ifdef FULL_DUPLEX */
	
#endif /* #if defined(CONFIG_ARCH_SMDK2410) */

	/* start the queue */
	netif_start_queue (dev);

	return (0);
}

static int cs8900_stop (struct net_device *dev)
{
	/* disable ethernet controller */
	cs8900_write (dev,PP_BusCTL,0);
	cs8900_write (dev,PP_TestCTL,0);
	cs8900_write (dev,PP_SelfCTL,0);
	cs8900_write (dev,PP_LineCTL,0);
	cs8900_write (dev,PP_BufCFG,0);
	cs8900_write (dev,PP_TxCFG,0);
	cs8900_write (dev,PP_RxCTL,0);
	cs8900_write (dev,PP_RxCFG,0);

	/* uninstall interrupt handler */
	free_irq (dev->irq,dev);

	/* stop the queue */
	netif_stop_queue (dev);

	return (0);
}

static struct net_device_stats *cs8900_get_stats (struct net_device *dev)
{
	cs8900_t *priv = (cs8900_t *) dev->priv;
	return (&priv->stats);
}

static void cs8900_set_receive_mode (struct net_device *dev)
{
	if ((dev->flags & IFF_PROMISC))
		cs8900_set (dev,PP_RxCTL,PromiscuousA);
	else
		cs8900_clear (dev,PP_RxCTL,PromiscuousA);

	if ((dev->flags & IFF_ALLMULTI) && dev->mc_list)
		cs8900_set (dev,PP_RxCTL,MulticastA);
	else
		cs8900_clear (dev,PP_RxCTL,MulticastA);
}

static int cs8900_eeprom (struct net_device *dev)
{
	cs8900_t *priv = (cs8900_t *) dev->priv;
	int i;

	/* SMDK2410 CS8900A without EEPROM at all */
#if defined(CONFIG_ARCH_SMDK2410)|defined(CONFIG_ARCH_SBC2440)
	return (-ENODEV);
#endif 

#ifdef DEBUG
	eepromdump (dev);
#endif

	if( (cs8900_read( dev, PP_SelfST) & EEPROMpresent) == 0)
	{
		/* no eeprom */
		return (-ENODEV);
	}

	/* add character device for easy eeprom programming */
	if( (priv->char_devnum=register_chrdev(0,"cs8900_eeprom",&cs8900_eeprom_fops)) != 0)
		printk (KERN_INFO "%s: Registered cs8900_eeprom char device (major #%d)\n",
			dev->name, priv->char_devnum);
	else
		printk (KERN_WARNING "%s: Failed to register char device cs8900_eeprom\n",dev->name);

	if( (cs8900_read( dev, PP_SelfST) & EEPROMOK) == 0) 
	{
		/* bad checksum, invalid config block */
		return (-EFAULT);
	}

	/* If we get here, the chip will have initialized the registers
	 * that were specified in the eeprom configuration block
	 * We assume this is at least the mac address.
	 */
	for (i = 0; i < ETH_ALEN; i += 2)
	{
		u16 mac = cs8900_read (dev,PP_IA + i);
		dev->dev_addr[i] = mac & 0xff;
		dev->dev_addr[i+1] = (mac>>8) & 0xff;
	}

	return (0);
}

/*
 * EEPROM Charater device
 */

static int cs8900_eeprom_fopen(struct inode *inode, struct file *file)
{
	u16 i;
	for( i=0; i<MAX_EEPROM_SIZE/2; i++)
	{
		cs8900_eeprom_read( &cs8900_dev, &cs8900_eeprom_cache[i],i);
	}

	return 0;
}

static int cs8900_eeprom_frelease(struct inode *inode, struct file *file)
{
	return 0;
}

static loff_t cs8900_eeprom_fllseek(struct file * file,loff_t offset, int whence)
{
	long newpos;

	switch(whence)
	{
		case 0: /* SEEK_SET */
			newpos = offset;
			break;
		case 1: /* SEEK_CUR */
			newpos = file->f_pos + offset;
			break;
		case 2: /* SEEK_END */
			newpos = (MAX_EEPROM_SIZE-1) - offset;
			break;
		default: /* can't happen */
			return -EINVAL;

	}

	if( (newpos<0) || (newpos>=MAX_EEPROM_SIZE)) return -EINVAL;

	file->f_pos = newpos;
	return newpos;
}

static ssize_t cs8900_eeprom_fread(struct file *file, char *buf, size_t count, loff_t *f_pos)
{
	unsigned char *temp = (unsigned char *)cs8900_eeprom_cache;

        if (*f_pos >= MAX_EEPROM_SIZE)
                return 0;

        if (*f_pos + count > MAX_EEPROM_SIZE)
            count = MAX_EEPROM_SIZE - *f_pos;

        if (count<1)
                return 0;

        if (copy_to_user(buf, &temp[*f_pos], count)){
                return -EFAULT;
        }
        *f_pos += count;
        return count;
}

static ssize_t cs8900_eeprom_fwrite(struct file *file, const char *buf, size_t count, loff_t *f_pos)
{
	u16 i;
	unsigned char *temp = (unsigned char *)cs8900_eeprom_cache;

        if (*f_pos >= MAX_EEPROM_SIZE)
                return 0;

        if (*f_pos + count > MAX_EEPROM_SIZE)
            count = MAX_EEPROM_SIZE - *f_pos;

        if (count<1)
                return 0;

	/* FIXME: lock critical section */

	/* update the cache */
        if (copy_from_user(&temp[*f_pos], buf, count)){
                return -EFAULT;
        }

	/* not concerned about performance, so write the entire thing */
	for( i=0; i<MAX_EEPROM_SIZE/2; i++)
	{
		cs8900_eeprom_write( &cs8900_dev, &cs8900_eeprom_cache[i],i);
	}

        *f_pos += count;
        return count;
}

/*
 * Architecture dependant code
 */

#ifdef CONFIG_SA1100_FRODO
static void frodo_reset (struct net_device *dev)
{
	int i;
	volatile u16 value;

	/* reset ethernet controller */
	FRODO_CPLD_ETHERNET |= FRODO_ETH_RESET;
	mdelay (50);
	FRODO_CPLD_ETHERNET &= ~FRODO_ETH_RESET;
	mdelay (50);

	/* we tied SBHE to CHIPSEL, so each memory access ensure the chip is in 16-bit mode */
	for (i = 0; i < 3; i++) value = cs8900_read (dev,0);

	/* FIXME: poll status bit */
}
#endif	/* #ifdef CONFIG_SA1100_FRODO */

/*
 * Driver initialization routines
 */

int __init cs8900_probe (struct net_device *dev)
{
	static cs8900_t priv;
	int i,result;
	u16 value;

	printk (VERSION_STRING"\n");

	memset (&priv,0,sizeof (cs8900_t));

	__raw_writel(0x2211d110,S3C2410_BWSCON);
	__raw_writel(0x1f7c,S3C2410_BANKCON3);
	ether_setup (dev);

	dev->open               = cs8900_start;
	dev->stop               = cs8900_stop;
	dev->hard_start_xmit    = cs8900_send_start;
	dev->get_stats          = cs8900_get_stats;
	dev->set_multicast_list = cs8900_set_receive_mode;
	dev->tx_timeout         = cs8900_transmit_timeout;
	dev->watchdog_timeo     = HZ;

#if defined(CONFIG_ARCH_SMDK2410)|defined(CONFIG_ARCH_SBC2440)
	dev->dev_addr[0] = 0x08;
	dev->dev_addr[1] = 0x00;
	dev->dev_addr[2] = 0x3e;
	dev->dev_addr[3] = 0x26;
	dev->dev_addr[4] = 0x0a;
	dev->dev_addr[5] = 0x5b;
#else
	dev->dev_addr[0] = 0x00;
    dev->dev_addr[1] = 0x12;
    dev->dev_addr[2] = 0x34;
    dev->dev_addr[3] = 0x56;
    dev->dev_addr[4] = 0x78;
    dev->dev_addr[5] = 0x9a;
#endif

	dev->if_port   = IF_PORT_10BASET;
	dev->priv      = (void *) &priv;

	spin_lock_init(&priv.lock);

	SET_MODULE_OWNER (dev);

#ifdef CONFIG_SA1100_FRODO
	dev->base_addr = FRODO_ETH_IO + 0x300;
	dev->irq = FRODO_ETH_IRQ;
	frodo_reset (dev);
#endif	/* #ifdef CONFIG_SA1100_FRODO */

#if defined(CONFIG_SA1100_CERF)
	dev->base_addr = CERF_ETH_IO + 0x300;
	dev->irq = CERF_ETH_IRQ;
#endif /* #if defined(CONFIG_SA1100_CERF) */

#if defined(CONFIG_ARCH_SMDK2410)|defined(CONFIG_ARCH_SBC2440)
	dev->base_addr = vSMDK2410_ETH_IO + 0x300;
	dev->irq = SMDK2410_ETH_IRQ;
#endif /* #if defined(CONFIG_ARCH_SMDK2410) */ 

	if ((result = check_mem_region (dev->base_addr, 16))) {
		printk (KERN_ERR "%s: can't get I/O port address 0x%lx\n",dev->name,dev->base_addr);
		return (result);
	}
	request_mem_region (dev->base_addr, 16, dev->name);
	
	/* verify EISA registration number for Cirrus Logic */
	if ((value = cs8900_read (dev,PP_ProductID)) != EISA_REG_CODE) {
		printk (KERN_ERR "%s: incorrect signature 0x%.4x\n",dev->name,value);
		return (-ENXIO);
	}

	/* verify chip version */
	value = cs8900_read (dev,PP_ProductID + 2);
	if (VERSION (value) != CS8900A) {
		printk (KERN_ERR "%s: unknown chip version 0x%.8x\n",dev->name,VERSION (value));
		return (-ENXIO);
	}
	/* setup interrupt number */
	cs8900_write (dev,PP_IntNum,0);

	/* If an EEPROM is present, use it's MAC address. A valid EEPROM will 
	 * initialize the registers automatically.
	 */
	result = cs8900_eeprom (dev);

	printk (KERN_INFO "%s: CS8900A rev %c at %#lx irq=%d",
		dev->name,'B' + REVISION (value) - REV_B, dev->base_addr, dev->irq);
	if (result == -ENODEV) {
		/* no eeprom or invalid config block, configure MAC address by hand */
		for (i = 0; i < ETH_ALEN; i += 2)
			cs8900_write (dev,PP_IA + i,dev->dev_addr[i] | (dev->dev_addr[i + 1] << 8));
		printk (", no eeprom ");
	}
	else if( result == -EFAULT)
	{
#if defined(CONFIG_SA1100_CERF)
	    /* The default eeprom layout doesn't follow the cs8900 layout 
		 * that enables automatic cs8900 initialization. Doh!
		 * Read the mac address manually.
		 */
		u16 MAC_addr[3] = {0, 0, 0};

		if (cs8900_eeprom_read(dev, &MAC_addr[0], 0x1c) == -1)
			printk("\ncs8900: [CERF] EEPROM[0] read failed\n");
		if (cs8900_eeprom_read(dev, &MAC_addr[1], 0x1d) == -1)
			printk("\ncs8900: [CERF] EEPROM[1] read failed\n");
		if (cs8900_eeprom_read(dev, &MAC_addr[2], 0x1e) == -1)
			printk("\ncs8900: [CERF] EEPROM[2] read failed\n");

		for (i = 0; i < ETH_ALEN / 2; i++)
		{
			dev->dev_addr[i*2]	= MAC_addr[i] & 0xff;
			dev->dev_addr[i*2+1]	= (MAC_addr[i] >> 8) & 0xff;

			cs8900_write (dev,PP_IA + i*2,dev->dev_addr[i*2] | (dev->dev_addr[i*2 + 1] << 8));
		}
		printk (", eeprom (smdk2410 layout)");
#else
		printk (", eeprom (invalid config block)");
#endif /* #if defined(CONFIG_SA1100_CERF) */
	}
	else
	{
		printk (", eeprom ok");
	}

	printk (", addr:");
	for (i = 0; i < ETH_ALEN; i += 2)
	{
		u16 mac = cs8900_read (dev,PP_IA + i);
		printk ("%c%02X:%2X", (i==0)?' ':':', mac & 0xff, (mac >> 8));
	}
	printk ("\n");

	return (0);
}

static int __init cs8900_init (void)
{
	strcpy(cs8900_dev.name, "eth%d");

	return (register_netdev (&cs8900_dev));
}

static void __exit cs8900_cleanup (void)
{
	cs8900_t *priv = (cs8900_t *) cs8900_dev.priv;
	if( priv->char_devnum)
	{
		unregister_chrdev(priv->char_devnum,"cs8900_eeprom");
	}
	release_mem_region (cs8900_dev.base_addr,16);
	unregister_netdev (&cs8900_dev);
}

MODULE_AUTHOR ("Abraham van der Merwe <abraham at 2d3d.co.za>");
MODULE_DESCRIPTION (VERSION_STRING);
MODULE_LICENSE ("GPL");

module_init (cs8900_init);
module_exit (cs8900_cleanup);