Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 2370 insertions, 0 deletions

diff --git a/drivers/net/sis900.c b/drivers/net/sis900.c
new file mode 100644
index 0000000..3e9d9aa
--- /dev/null
+++ b/drivers/net/sis900.c
@@ -0,0 +1,2370 @@
+/* sis900.c: A SiS 900/7016 PCI Fast Ethernet driver for Linux.
+   Copyright 1999 Silicon Integrated System Corporation 
+   Revision:	1.08.08 Jan. 22 2005
+   
+   Modified from the driver which is originally written by Donald Becker.
+   
+   This software may be used and distributed according to the terms
+   of the GNU General Public License (GPL), incorporated herein by reference.
+   Drivers based on this skeleton fall under the GPL and must retain
+   the authorship (implicit copyright) notice.
+   
+   References:
+   SiS 7016 Fast Ethernet PCI Bus 10/100 Mbps LAN Controller with OnNow Support,
+   preliminary Rev. 1.0 Jan. 14, 1998
+   SiS 900 Fast Ethernet PCI Bus 10/100 Mbps LAN Single Chip with OnNow Support,
+   preliminary Rev. 1.0 Nov. 10, 1998
+   SiS 7014 Single Chip 100BASE-TX/10BASE-T Physical Layer Solution,
+   preliminary Rev. 1.0 Jan. 18, 1998
+
+   Rev 1.08.08 Jan. 22 2005 Daniele Venzano use netif_msg for debugging messages
+   Rev 1.08.07 Nov.  2 2003 Daniele Venzano <webvenza@libero.it> add suspend/resume support
+   Rev 1.08.06 Sep. 24 2002 Mufasa Yang bug fix for Tx timeout & add SiS963 support
+   Rev 1.08.05 Jun.  6 2002 Mufasa Yang bug fix for read_eeprom & Tx descriptor over-boundary
+   Rev 1.08.04 Apr. 25 2002 Mufasa Yang <mufasa@sis.com.tw> added SiS962 support
+   Rev 1.08.03 Feb.  1 2002 Matt Domsch <Matt_Domsch@dell.com> update to use library crc32 function
+   Rev 1.08.02 Nov. 30 2001 Hui-Fen Hsu workaround for EDB & bug fix for dhcp problem
+   Rev 1.08.01 Aug. 25 2001 Hui-Fen Hsu update for 630ET & workaround for ICS1893 PHY
+   Rev 1.08.00 Jun. 11 2001 Hui-Fen Hsu workaround for RTL8201 PHY and some bug fix
+   Rev 1.07.11 Apr.  2 2001 Hui-Fen Hsu updates PCI drivers to use the new pci_set_dma_mask for kernel 2.4.3
+   Rev 1.07.10 Mar.  1 2001 Hui-Fen Hsu <hfhsu@sis.com.tw> some bug fix & 635M/B support 
+   Rev 1.07.09 Feb.  9 2001 Dave Jones <davej@suse.de> PCI enable cleanup
+   Rev 1.07.08 Jan.  8 2001 Lei-Chun Chang added RTL8201 PHY support
+   Rev 1.07.07 Nov. 29 2000 Lei-Chun Chang added kernel-doc extractable documentation and 630 workaround fix
+   Rev 1.07.06 Nov.  7 2000 Jeff Garzik <jgarzik@pobox.com> some bug fix and cleaning
+   Rev 1.07.05 Nov.  6 2000 metapirat<metapirat@gmx.de> contribute media type select by ifconfig
+   Rev 1.07.04 Sep.  6 2000 Lei-Chun Chang added ICS1893 PHY support
+   Rev 1.07.03 Aug. 24 2000 Lei-Chun Chang (lcchang@sis.com.tw) modified 630E eqaulizer workaround rule
+   Rev 1.07.01 Aug. 08 2000 Ollie Lho minor update for SiS 630E and SiS 630E A1
+   Rev 1.07    Mar. 07 2000 Ollie Lho bug fix in Rx buffer ring
+   Rev 1.06.04 Feb. 11 2000 Jeff Garzik <jgarzik@pobox.com> softnet and init for kernel 2.4
+   Rev 1.06.03 Dec. 23 1999 Ollie Lho Third release
+   Rev 1.06.02 Nov. 23 1999 Ollie Lho bug in mac probing fixed
+   Rev 1.06.01 Nov. 16 1999 Ollie Lho CRC calculation provide by Joseph Zbiciak (im14u2c@primenet.com)
+   Rev 1.06 Nov. 4 1999 Ollie Lho (ollie@sis.com.tw) Second release
+   Rev 1.05.05 Oct. 29 1999 Ollie Lho (ollie@sis.com.tw) Single buffer Tx/Rx
+   Chin-Shan Li (lcs@sis.com.tw) Added AMD Am79c901 HomePNA PHY support
+   Rev 1.05 Aug. 7 1999 Jim Huang (cmhuang@sis.com.tw) Initial release
+*/
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/errno.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+#include <linux/netdevice.h>
+#include <linux/init.h>
+#include <linux/mii.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/delay.h>
+#include <linux/ethtool.h>
+#include <linux/crc32.h>
+#include <linux/bitops.h>
+
+#include <asm/processor.h>      /* Processor type for cache alignment. */
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/uaccess.h>	/* User space memory access functions */
+
+#include "sis900.h"
+
+#define SIS900_MODULE_NAME "sis900"
+#define SIS900_DRV_VERSION "v1.08.08 Jan. 22 2005"
+
+static char version[] __devinitdata =
+KERN_INFO "sis900.c: " SIS900_DRV_VERSION "\n";
+
+static int max_interrupt_work = 40;
+static int multicast_filter_limit = 128;
+
+static int sis900_debug = -1; /* Use SIS900_DEF_MSG as value */
+
+#define SIS900_DEF_MSG \
+	(NETIF_MSG_DRV		| \
+	 NETIF_MSG_LINK		| \
+	 NETIF_MSG_RX_ERR	| \
+	 NETIF_MSG_TX_ERR)
+
+/* Time in jiffies before concluding the transmitter is hung. */
+#define TX_TIMEOUT  (4*HZ)
+/* SiS 900 is capable of 32 bits BM DMA */
+#define SIS900_DMA_MASK 0xffffffff
+
+enum {
+	SIS_900 = 0,
+	SIS_7016
+};
+static char * card_names[] = {
+	"SiS 900 PCI Fast Ethernet",
+	"SiS 7016 PCI Fast Ethernet"
+};
+static struct pci_device_id sis900_pci_tbl [] = {
+	{PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_900,
+	 PCI_ANY_ID, PCI_ANY_ID, 0, 0, SIS_900},
+	{PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_7016,
+	 PCI_ANY_ID, PCI_ANY_ID, 0, 0, SIS_7016},
+	{0,}
+};
+MODULE_DEVICE_TABLE (pci, sis900_pci_tbl);
+
+static void sis900_read_mode(struct net_device *net_dev, int *speed, int *duplex);
+
+static struct mii_chip_info {
+	const char * name;
+	u16 phy_id0;
+	u16 phy_id1;
+	u8  phy_types;
+#define	HOME 	0x0001
+#define LAN	0x0002
+#define MIX	0x0003
+#define UNKNOWN	0x0
+} mii_chip_table[] = {
+	{ "SiS 900 Internal MII PHY", 		0x001d, 0x8000, LAN },
+	{ "SiS 7014 Physical Layer Solution", 	0x0016, 0xf830, LAN },
+	{ "Altimata AC101LF PHY",               0x0022, 0x5520, LAN },
+	{ "AMD 79C901 10BASE-T PHY",  		0x0000, 0x6B70, LAN },
+	{ "AMD 79C901 HomePNA PHY",		0x0000, 0x6B90, HOME},
+	{ "ICS LAN PHY",			0x0015, 0xF440, LAN },
+	{ "NS 83851 PHY",			0x2000, 0x5C20, MIX },
+	{ "NS 83847 PHY",                       0x2000, 0x5C30, MIX },
+	{ "Realtek RTL8201 PHY",		0x0000, 0x8200, LAN },
+	{ "VIA 6103 PHY",			0x0101, 0x8f20, LAN },
+	{NULL,},
+};
+
+struct mii_phy {
+	struct mii_phy * next;
+	int phy_addr;
+	u16 phy_id0;
+	u16 phy_id1;
+	u16 status;
+	u8  phy_types;
+};
+
+typedef struct _BufferDesc {
+	u32 link;
+	u32 cmdsts;
+	u32 bufptr;
+} BufferDesc;
+
+struct sis900_private {
+	struct net_device_stats stats;
+	struct pci_dev * pci_dev;
+
+	spinlock_t lock;
+
+	struct mii_phy * mii;
+	struct mii_phy * first_mii; /* record the first mii structure */
+	unsigned int cur_phy;
+
+	struct timer_list timer; /* Link status detection timer. */
+	u8 autong_complete; /* 1: auto-negotiate complete  */
+
+	u32 msg_enable;
+
+	unsigned int cur_rx, dirty_rx; /* producer/comsumer pointers for Tx/Rx ring */
+	unsigned int cur_tx, dirty_tx;
+
+	/* The saved address of a sent/receive-in-place packet buffer */
+	struct sk_buff *tx_skbuff[NUM_TX_DESC];
+	struct sk_buff *rx_skbuff[NUM_RX_DESC];
+	BufferDesc *tx_ring;
+	BufferDesc *rx_ring;
+
+	dma_addr_t tx_ring_dma;
+	dma_addr_t rx_ring_dma;
+
+	unsigned int tx_full; /* The Tx queue is full. */
+	u8 host_bridge_rev;
+	u8 chipset_rev;
+};
+
+MODULE_AUTHOR("Jim Huang <cmhuang@sis.com.tw>, Ollie Lho <ollie@sis.com.tw>");
+MODULE_DESCRIPTION("SiS 900 PCI Fast Ethernet driver");
+MODULE_LICENSE("GPL");
+
+module_param(multicast_filter_limit, int, 0444);
+module_param(max_interrupt_work, int, 0444);
+module_param(sis900_debug, int, 0444);
+MODULE_PARM_DESC(multicast_filter_limit, "SiS 900/7016 maximum number of filtered multicast addresses");
+MODULE_PARM_DESC(max_interrupt_work, "SiS 900/7016 maximum events handled per interrupt");
+MODULE_PARM_DESC(sis900_debug, "SiS 900/7016 bitmapped debugging message level");
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void sis900_poll(struct net_device *dev);
+#endif
+static int sis900_open(struct net_device *net_dev);
+static int sis900_mii_probe (struct net_device * net_dev);
+static void sis900_init_rxfilter (struct net_device * net_dev);
+static u16 read_eeprom(long ioaddr, int location);
+static u16 mdio_read(struct net_device *net_dev, int phy_id, int location);
+static void mdio_write(struct net_device *net_dev, int phy_id, int location, int val);
+static void sis900_timer(unsigned long data);
+static void sis900_check_mode (struct net_device *net_dev, struct mii_phy *mii_phy);
+static void sis900_tx_timeout(struct net_device *net_dev);
+static void sis900_init_tx_ring(struct net_device *net_dev);
+static void sis900_init_rx_ring(struct net_device *net_dev);
+static int sis900_start_xmit(struct sk_buff *skb, struct net_device *net_dev);
+static int sis900_rx(struct net_device *net_dev);
+static void sis900_finish_xmit (struct net_device *net_dev);
+static irqreturn_t sis900_interrupt(int irq, void *dev_instance, struct pt_regs *regs);
+static int sis900_close(struct net_device *net_dev);
+static int mii_ioctl(struct net_device *net_dev, struct ifreq *rq, int cmd);
+static struct net_device_stats *sis900_get_stats(struct net_device *net_dev);
+static u16 sis900_mcast_bitnr(u8 *addr, u8 revision);
+static void set_rx_mode(struct net_device *net_dev);
+static void sis900_reset(struct net_device *net_dev);
+static void sis630_set_eq(struct net_device *net_dev, u8 revision);
+static int sis900_set_config(struct net_device *dev, struct ifmap *map);
+static u16 sis900_default_phy(struct net_device * net_dev);
+static void sis900_set_capability( struct net_device *net_dev ,struct mii_phy *phy);
+static u16 sis900_reset_phy(struct net_device *net_dev, int phy_addr);
+static void sis900_auto_negotiate(struct net_device *net_dev, int phy_addr);
+static void sis900_set_mode (long ioaddr, int speed, int duplex);
+static struct ethtool_ops sis900_ethtool_ops;
+
+/**
+ *	sis900_get_mac_addr - Get MAC address for stand alone SiS900 model
+ *	@pci_dev: the sis900 pci device
+ *	@net_dev: the net device to get address for 
+ *
+ *	Older SiS900 and friends, use EEPROM to store MAC address.
+ *	MAC address is read from read_eeprom() into @net_dev->dev_addr.
+ */
+
+static int __devinit sis900_get_mac_addr(struct pci_dev * pci_dev, struct net_device *net_dev)
+{
+	long ioaddr = pci_resource_start(pci_dev, 0);
+	u16 signature;
+	int i;
+
+	/* check to see if we have sane EEPROM */
+	signature = (u16) read_eeprom(ioaddr, EEPROMSignature);    
+	if (signature == 0xffff || signature == 0x0000) {
+		printk (KERN_WARNING "%s: Error EERPOM read %x\n", 
+			pci_name(pci_dev), signature);
+		return 0;
+	}
+
+	/* get MAC address from EEPROM */
+	for (i = 0; i < 3; i++)
+	        ((u16 *)(net_dev->dev_addr))[i] = read_eeprom(ioaddr, i+EEPROMMACAddr);
+
+	return 1;
+}
+
+/**
+ *	sis630e_get_mac_addr - Get MAC address for SiS630E model
+ *	@pci_dev: the sis900 pci device
+ *	@net_dev: the net device to get address for 
+ *
+ *	SiS630E model, use APC CMOS RAM to store MAC address.
+ *	APC CMOS RAM is accessed through ISA bridge.
+ *	MAC address is read into @net_dev->dev_addr.
+ */
+
+static int __devinit sis630e_get_mac_addr(struct pci_dev * pci_dev,
+					struct net_device *net_dev)
+{
+	struct pci_dev *isa_bridge = NULL;
+	u8 reg;
+	int i;
+
+	isa_bridge = pci_get_device(PCI_VENDOR_ID_SI, 0x0008, isa_bridge);
+	if (!isa_bridge)
+		isa_bridge = pci_get_device(PCI_VENDOR_ID_SI, 0x0018, isa_bridge);
+	if (!isa_bridge) {
+		printk(KERN_WARNING "%s: Can not find ISA bridge\n",
+		       pci_name(pci_dev));
+		return 0;
+	}
+	pci_read_config_byte(isa_bridge, 0x48, &reg);
+	pci_write_config_byte(isa_bridge, 0x48, reg | 0x40);
+
+	for (i = 0; i < 6; i++) {
+		outb(0x09 + i, 0x70);
+		((u8 *)(net_dev->dev_addr))[i] = inb(0x71); 
+	}
+	pci_write_config_byte(isa_bridge, 0x48, reg & ~0x40);
+	pci_dev_put(isa_bridge);
+
+	return 1;
+}
+
+
+/**
+ *	sis635_get_mac_addr - Get MAC address for SIS635 model
+ *	@pci_dev: the sis900 pci device
+ *	@net_dev: the net device to get address for 
+ *
+ *	SiS635 model, set MAC Reload Bit to load Mac address from APC
+ *	to rfdr. rfdr is accessed through rfcr. MAC address is read into 
+ *	@net_dev->dev_addr.
+ */
+
+static int __devinit sis635_get_mac_addr(struct pci_dev * pci_dev,
+					struct net_device *net_dev)
+{
+	long ioaddr = net_dev->base_addr;
+	u32 rfcrSave;
+	u32 i;
+
+	rfcrSave = inl(rfcr + ioaddr);
+
+	outl(rfcrSave | RELOAD, ioaddr + cr);
+	outl(0, ioaddr + cr);
+
+	/* disable packet filtering before setting filter */
+	outl(rfcrSave & ~RFEN, rfcr + ioaddr);
+
+	/* load MAC addr to filter data register */
+	for (i = 0 ; i < 3 ; i++) {
+		outl((i << RFADDR_shift), ioaddr + rfcr);
+		*( ((u16 *)net_dev->dev_addr) + i) = inw(ioaddr + rfdr);
+	}
+
+	/* enable packet filtering */
+	outl(rfcrSave | RFEN, rfcr + ioaddr);
+
+	return 1;
+}
+
+/**
+ *	sis96x_get_mac_addr - Get MAC address for SiS962 or SiS963 model
+ *	@pci_dev: the sis900 pci device
+ *	@net_dev: the net device to get address for 
+ *
+ *	SiS962 or SiS963 model, use EEPROM to store MAC address. And EEPROM 
+ *	is shared by
+ *	LAN and 1394. When access EEPROM, send EEREQ signal to hardware first 
+ *	and wait for EEGNT. If EEGNT is ON, EEPROM is permitted to be access 
+ *	by LAN, otherwise is not. After MAC address is read from EEPROM, send
+ *	EEDONE signal to refuse EEPROM access by LAN. 
+ *	The EEPROM map of SiS962 or SiS963 is different to SiS900. 
+ *	The signature field in SiS962 or SiS963 spec is meaningless. 
+ *	MAC address is read into @net_dev->dev_addr.
+ */
+
+static int __devinit sis96x_get_mac_addr(struct pci_dev * pci_dev,
+					struct net_device *net_dev)
+{
+	long ioaddr = net_dev->base_addr;
+	long ee_addr = ioaddr + mear;
+	u32 waittime = 0;
+	int i;
+	
+	outl(EEREQ, ee_addr);
+	while(waittime < 2000) {
+		if(inl(ee_addr) & EEGNT) {
+
+			/* get MAC address from EEPROM */
+			for (i = 0; i < 3; i++)
+			        ((u16 *)(net_dev->dev_addr))[i] = read_eeprom(ioaddr, i+EEPROMMACAddr);
+
+			outl(EEDONE, ee_addr);
+			return 1;
+		} else {
+			udelay(1);	
+			waittime ++;
+		}
+	}
+	outl(EEDONE, ee_addr);
+	return 0;
+}
+
+/**
+ *	sis900_probe - Probe for sis900 device
+ *	@pci_dev: the sis900 pci device
+ *	@pci_id: the pci device ID
+ *
+ *	Check and probe sis900 net device for @pci_dev.
+ *	Get mac address according to the chip revision, 
+ *	and assign SiS900-specific entries in the device structure.
+ *	ie: sis900_open(), sis900_start_xmit(), sis900_close(), etc.
+ */
+
+static int __devinit sis900_probe(struct pci_dev *pci_dev,
+				const struct pci_device_id *pci_id)
+{
+	struct sis900_private *sis_priv;
+	struct net_device *net_dev;
+	struct pci_dev *dev;
+	dma_addr_t ring_dma;
+	void *ring_space;
+	long ioaddr;
+	int i, ret;
+	char *card_name = card_names[pci_id->driver_data];
+	const char *dev_name = pci_name(pci_dev);
+
+/* when built into the kernel, we only print version if device is found */
+#ifndef MODULE
+	static int printed_version;
+	if (!printed_version++)
+		printk(version);
+#endif
+
+	/* setup various bits in PCI command register */
+	ret = pci_enable_device(pci_dev);
+	if(ret) return ret;
+	
+	i = pci_set_dma_mask(pci_dev, SIS900_DMA_MASK);
+	if(i){
+		printk(KERN_ERR "sis900.c: architecture does not support"
+			"32bit PCI busmaster DMA\n");
+		return i;
+	}
+	
+	pci_set_master(pci_dev);
+	
+	net_dev = alloc_etherdev(sizeof(struct sis900_private));
+	if (!net_dev)
+		return -ENOMEM;
+	SET_MODULE_OWNER(net_dev);
+	SET_NETDEV_DEV(net_dev, &pci_dev->dev);
+
+	/* We do a request_region() to register /proc/ioports info. */
+	ioaddr = pci_resource_start(pci_dev, 0);	
+	ret = pci_request_regions(pci_dev, "sis900");
+	if (ret)
+		goto err_out;
+
+	sis_priv = net_dev->priv;
+	net_dev->base_addr = ioaddr;
+	net_dev->irq = pci_dev->irq;
+	sis_priv->pci_dev = pci_dev;
+	spin_lock_init(&sis_priv->lock);
+
+	pci_set_drvdata(pci_dev, net_dev);
+
+	ring_space = pci_alloc_consistent(pci_dev, TX_TOTAL_SIZE, &ring_dma);
+	if (!ring_space) {
+		ret = -ENOMEM;
+		goto err_out_cleardev;
+	}
+	sis_priv->tx_ring = (BufferDesc *)ring_space;
+	sis_priv->tx_ring_dma = ring_dma;
+
+	ring_space = pci_alloc_consistent(pci_dev, RX_TOTAL_SIZE, &ring_dma);
+	if (!ring_space) {
+		ret = -ENOMEM;
+		goto err_unmap_tx;
+	}
+	sis_priv->rx_ring = (BufferDesc *)ring_space;
+	sis_priv->rx_ring_dma = ring_dma;
+		
+	/* The SiS900-specific entries in the device structure. */
+	net_dev->open = &sis900_open;
+	net_dev->hard_start_xmit = &sis900_start_xmit;
+	net_dev->stop = &sis900_close;
+	net_dev->get_stats = &sis900_get_stats;
+	net_dev->set_config = &sis900_set_config;
+	net_dev->set_multicast_list = &set_rx_mode;
+	net_dev->do_ioctl = &mii_ioctl;
+	net_dev->tx_timeout = sis900_tx_timeout;
+	net_dev->watchdog_timeo = TX_TIMEOUT;
+	net_dev->ethtool_ops = &sis900_ethtool_ops;
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+        net_dev->poll_controller = &sis900_poll;
+#endif
+
+	if (sis900_debug > 0)
+		sis_priv->msg_enable = sis900_debug;
+	else
+		sis_priv->msg_enable = SIS900_DEF_MSG;
+		
+	/* Get Mac address according to the chip revision */
+	pci_read_config_byte(pci_dev, PCI_CLASS_REVISION, &(sis_priv->chipset_rev));
+	if(netif_msg_probe(sis_priv))
+		printk(KERN_DEBUG "%s: detected revision %2.2x, "
+				"trying to get MAC address...\n",
+				dev_name, sis_priv->chipset_rev);
+	
+	ret = 0;
+	if (sis_priv->chipset_rev == SIS630E_900_REV)
+		ret = sis630e_get_mac_addr(pci_dev, net_dev);
+	else if ((sis_priv->chipset_rev > 0x81) && (sis_priv->chipset_rev <= 0x90) )
+		ret = sis635_get_mac_addr(pci_dev, net_dev);
+	else if (sis_priv->chipset_rev == SIS96x_900_REV)
+		ret = sis96x_get_mac_addr(pci_dev, net_dev);
+	else
+		ret = sis900_get_mac_addr(pci_dev, net_dev);
+
+	if (ret == 0) {
+		printk(KERN_WARNING "%s: Cannot read MAC address.\n", dev_name);
+		ret = -ENODEV;
+		goto err_unmap_rx;
+	}
+	
+	/* 630ET : set the mii access mode as software-mode */
+	if (sis_priv->chipset_rev == SIS630ET_900_REV)
+		outl(ACCESSMODE | inl(ioaddr + cr), ioaddr + cr);
+
+	/* probe for mii transceiver */
+	if (sis900_mii_probe(net_dev) == 0) {
+		printk(KERN_WARNING "%s: Error probing MII device.\n",
+		       dev_name);
+		ret = -ENODEV;
+		goto err_unmap_rx;
+	}
+
+	/* save our host bridge revision */
+	dev = pci_get_device(PCI_VENDOR_ID_SI, PCI_DEVICE_ID_SI_630, NULL);
+	if (dev) {
+		pci_read_config_byte(dev, PCI_CLASS_REVISION, &sis_priv->host_bridge_rev);
+		pci_dev_put(dev);
+	}
+
+	ret = register_netdev(net_dev);
+	if (ret)
+		goto err_unmap_rx;
+
+	/* print some information about our NIC */
+	printk(KERN_INFO "%s: %s at %#lx, IRQ %d, ", net_dev->name,
+	       card_name, ioaddr, net_dev->irq);
+	for (i = 0; i < 5; i++)
+		printk("%2.2x:", (u8)net_dev->dev_addr[i]);
+	printk("%2.2x.\n", net_dev->dev_addr[i]);
+
+	return 0;
+
+ err_unmap_rx:
+	pci_free_consistent(pci_dev, RX_TOTAL_SIZE, sis_priv->rx_ring,
+		sis_priv->rx_ring_dma);
+ err_unmap_tx:
+	pci_free_consistent(pci_dev, TX_TOTAL_SIZE, sis_priv->tx_ring,
+		sis_priv->tx_ring_dma);
+ err_out_cleardev:
+ 	pci_set_drvdata(pci_dev, NULL);
+	pci_release_regions(pci_dev);
+ err_out:
+	free_netdev(net_dev);
+	return ret;
+}
+
+/**
+ *	sis900_mii_probe - Probe MII PHY for sis900
+ *	@net_dev: the net device to probe for
+ *	
+ *	Search for total of 32 possible mii phy addresses.
+ *	Identify and set current phy if found one,
+ *	return error if it failed to found.
+ */
+
+static int __init sis900_mii_probe(struct net_device * net_dev)
+{
+	struct sis900_private * sis_priv = net_dev->priv;
+	const char *dev_name = pci_name(sis_priv->pci_dev);
+	u16 poll_bit = MII_STAT_LINK, status = 0;
+	unsigned long timeout = jiffies + 5 * HZ;
+	int phy_addr;
+
+	sis_priv->mii = NULL;
+
+	/* search for total of 32 possible mii phy addresses */
+	for (phy_addr = 0; phy_addr < 32; phy_addr++) {	
+		struct mii_phy * mii_phy = NULL;
+		u16 mii_status;
+		int i;
+
+		mii_phy = NULL;
+		for(i = 0; i < 2; i++)
+			mii_status = mdio_read(net_dev, phy_addr, MII_STATUS);
+
+		if (mii_status == 0xffff || mii_status == 0x0000) {
+			if (netif_msg_probe(sis_priv))
+				printk(KERN_DEBUG "%s: MII at address %d"
+						" not accessible\n",
+						dev_name, phy_addr);
+			continue;
+		}
+		
+		if ((mii_phy = kmalloc(sizeof(struct mii_phy), GFP_KERNEL)) == NULL) {
+			printk(KERN_WARNING "Cannot allocate mem for struct mii_phy\n");
+			mii_phy = sis_priv->first_mii;
+			while (mii_phy) {
+				struct mii_phy *phy;
+				phy = mii_phy;
+				mii_phy = mii_phy->next;
+				kfree(phy);
+			}
+			return 0;
+		}
+		
+		mii_phy->phy_id0 = mdio_read(net_dev, phy_addr, MII_PHY_ID0);
+		mii_phy->phy_id1 = mdio_read(net_dev, phy_addr, MII_PHY_ID1);		
+		mii_phy->phy_addr = phy_addr;
+		mii_phy->status = mii_status;
+		mii_phy->next = sis_priv->mii;
+		sis_priv->mii = mii_phy;
+		sis_priv->first_mii = mii_phy;
+
+		for (i = 0; mii_chip_table[i].phy_id1; i++)
+			if ((mii_phy->phy_id0 == mii_chip_table[i].phy_id0 ) &&
+			    ((mii_phy->phy_id1 & 0xFFF0) == mii_chip_table[i].phy_id1)){
+				mii_phy->phy_types = mii_chip_table[i].phy_types;
+				if (mii_chip_table[i].phy_types == MIX)
+					mii_phy->phy_types =
+					    (mii_status & (MII_STAT_CAN_TX_FDX | MII_STAT_CAN_TX)) ? LAN : HOME;
+				printk(KERN_INFO "%s: %s transceiver found "
+							"at address %d.\n",
+							dev_name,
+							mii_chip_table[i].name,
+							phy_addr);
+				break;
+			}
+			
+		if( !mii_chip_table[i].phy_id1 ) {
+			printk(KERN_INFO "%s: Unknown PHY transceiver found at address %d.\n",
+			       dev_name, phy_addr);
+			mii_phy->phy_types = UNKNOWN;
+		}
+	}
+	
+	if (sis_priv->mii == NULL) {
+		printk(KERN_INFO "%s: No MII transceivers found!\n", dev_name);
+		return 0;
+	}
+
+	/* select default PHY for mac */
+	sis_priv->mii = NULL;
+	sis900_default_phy( net_dev );
+
+	/* Reset phy if default phy is internal sis900 */
+        if ((sis_priv->mii->phy_id0 == 0x001D) &&
+	    ((sis_priv->mii->phy_id1&0xFFF0) == 0x8000))
+        	status = sis900_reset_phy(net_dev, sis_priv->cur_phy);
+        
+        /* workaround for ICS1893 PHY */
+        if ((sis_priv->mii->phy_id0 == 0x0015) &&
+            ((sis_priv->mii->phy_id1&0xFFF0) == 0xF440))
+            	mdio_write(net_dev, sis_priv->cur_phy, 0x0018, 0xD200);
+
+	if(status & MII_STAT_LINK){
+		while (poll_bit) {
+			yield();
+
+			poll_bit ^= (mdio_read(net_dev, sis_priv->cur_phy, MII_STATUS) & poll_bit);
+			if (time_after_eq(jiffies, timeout)) {
+				printk(KERN_WARNING "%s: reset phy and link down now\n",
+				       dev_name);
+				return -ETIME;
+			}
+		}
+	}
+
+	if (sis_priv->chipset_rev == SIS630E_900_REV) {
+		/* SiS 630E has some bugs on default value of PHY registers */
+		mdio_write(net_dev, sis_priv->cur_phy, MII_ANADV, 0x05e1);
+		mdio_write(net_dev, sis_priv->cur_phy, MII_CONFIG1, 0x22);
+		mdio_write(net_dev, sis_priv->cur_phy, MII_CONFIG2, 0xff00);
+		mdio_write(net_dev, sis_priv->cur_phy, MII_MASK, 0xffc0);
+		//mdio_write(net_dev, sis_priv->cur_phy, MII_CONTROL, 0x1000);	
+	}
+
+	if (sis_priv->mii->status & MII_STAT_LINK)
+		netif_carrier_on(net_dev);
+	else
+		netif_carrier_off(net_dev);
+
+	return 1;
+}
+
+/**
+ *	sis900_default_phy - Select default PHY for sis900 mac.
+ *	@net_dev: the net device to probe for
+ *
+ *	Select first detected PHY with link as default.
+ *	If no one is link on, select PHY whose types is HOME as default.
+ *	If HOME doesn't exist, select LAN.
+ */
+
+static u16 sis900_default_phy(struct net_device * net_dev)
+{
+	struct sis900_private * sis_priv = net_dev->priv;
+ 	struct mii_phy *phy = NULL, *phy_home = NULL, 
+		*default_phy = NULL, *phy_lan = NULL;
+	u16 status;
+
+        for (phy=sis_priv->first_mii; phy; phy=phy->next) {
+		status = mdio_read(net_dev, phy->phy_addr, MII_STATUS);
+		status = mdio_read(net_dev, phy->phy_addr, MII_STATUS);
+
+		/* Link ON & Not select default PHY & not ghost PHY */
+		 if ((status & MII_STAT_LINK) && !default_phy &&
+					(phy->phy_types != UNKNOWN))
+		 	default_phy = phy;
+		 else {
+			status = mdio_read(net_dev, phy->phy_addr, MII_CONTROL);
+			mdio_write(net_dev, phy->phy_addr, MII_CONTROL,
+				status | MII_CNTL_AUTO | MII_CNTL_ISOLATE);
+			if (phy->phy_types == HOME)
+				phy_home = phy;
+			else if(phy->phy_types == LAN)
+				phy_lan = phy;
+		 }
+	}
+
+	if (!default_phy && phy_home)
+		default_phy = phy_home;
+	else if (!default_phy && phy_lan)
+		default_phy = phy_lan;
+	else if (!default_phy)
+		default_phy = sis_priv->first_mii;
+
+	if (sis_priv->mii != default_phy) {
+		sis_priv->mii = default_phy;
+		sis_priv->cur_phy = default_phy->phy_addr;
+		printk(KERN_INFO "%s: Using transceiver found at address %d as default\n",
+		       pci_name(sis_priv->pci_dev), sis_priv->cur_phy);
+	}
+	
+	status = mdio_read(net_dev, sis_priv->cur_phy, MII_CONTROL);
+	status &= (~MII_CNTL_ISOLATE);
+
+	mdio_write(net_dev, sis_priv->cur_phy, MII_CONTROL, status);	
+	status = mdio_read(net_dev, sis_priv->cur_phy, MII_STATUS);
+	status = mdio_read(net_dev, sis_priv->cur_phy, MII_STATUS);
+
+	return status;	
+}
+
+
+/**
+ * 	sis900_set_capability - set the media capability of network adapter.
+ *	@net_dev : the net device to probe for
+ *	@phy : default PHY
+ *
+ *	Set the media capability of network adapter according to
+ *	mii status register. It's necessary before auto-negotiate.
+ */
+ 
+static void sis900_set_capability(struct net_device *net_dev, struct mii_phy *phy)
+{
+	u16 cap;
+	u16 status;
+	
+	status = mdio_read(net_dev, phy->phy_addr, MII_STATUS);
+	status = mdio_read(net_dev, phy->phy_addr, MII_STATUS);
+	
+	cap = MII_NWAY_CSMA_CD |
+		((phy->status & MII_STAT_CAN_TX_FDX)? MII_NWAY_TX_FDX:0) |
+		((phy->status & MII_STAT_CAN_TX)    ? MII_NWAY_TX:0) |
+		((phy->status & MII_STAT_CAN_T_FDX) ? MII_NWAY_T_FDX:0)|
+		((phy->status & MII_STAT_CAN_T)     ? MII_NWAY_T:0);
+
+	mdio_write(net_dev, phy->phy_addr, MII_ANADV, cap);
+}
+
+
+/* Delay between EEPROM clock transitions. */
+#define eeprom_delay()  inl(ee_addr)
+
+/**
+ *	read_eeprom - Read Serial EEPROM
+ *	@ioaddr: base i/o address
+ *	@location: the EEPROM location to read
+ *
+ *	Read Serial EEPROM through EEPROM Access Register.
+ *	Note that location is in word (16 bits) unit
+ */
+
+static u16 __devinit read_eeprom(long ioaddr, int location)
+{
+	int i;
+	u16 retval = 0;
+	long ee_addr = ioaddr + mear;
+	u32 read_cmd = location | EEread;
+
+	outl(0, ee_addr);
+	eeprom_delay();
+	outl(EECS, ee_addr);
+	eeprom_delay();
+
+	/* Shift the read command (9) bits out. */
+	for (i = 8; i >= 0; i--) {
+		u32 dataval = (read_cmd & (1 << i)) ? EEDI | EECS : EECS;
+		outl(dataval, ee_addr);
+		eeprom_delay();
+		outl(dataval | EECLK, ee_addr);
+		eeprom_delay();
+	}
+	outl(EECS, ee_addr);
+	eeprom_delay();
+
+	/* read the 16-bits data in */
+	for (i = 16; i > 0; i--) {
+		outl(EECS, ee_addr);
+		eeprom_delay();
+		outl(EECS | EECLK, ee_addr);
+		eeprom_delay();
+		retval = (retval << 1) | ((inl(ee_addr) & EEDO) ? 1 : 0);
+		eeprom_delay();
+	}
+
+	/* Terminate the EEPROM access. */
+	outl(0, ee_addr);
+	eeprom_delay();
+
+	return (retval);
+}
+
+/* Read and write the MII management registers using software-generated
+   serial MDIO protocol. Note that the command bits and data bits are
+   send out separately */
+#define mdio_delay()    inl(mdio_addr)
+
+static void mdio_idle(long mdio_addr)
+{
+	outl(MDIO | MDDIR, mdio_addr);
+	mdio_delay();
+	outl(MDIO | MDDIR | MDC, mdio_addr);
+}
+
+/* Syncronize the MII management interface by shifting 32 one bits out. */
+static void mdio_reset(long mdio_addr)
+{
+	int i;
+
+	for (i = 31; i >= 0; i--) {
+		outl(MDDIR | MDIO, mdio_addr);
+		mdio_delay();
+		outl(MDDIR | MDIO | MDC, mdio_addr);
+		mdio_delay();
+	}
+	return;
+}
+
+/**
+ *	mdio_read - read MII PHY register
+ *	@net_dev: the net device to read
+ *	@phy_id: the phy address to read
+ *	@location: the phy regiester id to read
+ *
+ *	Read MII registers through MDIO and MDC
+ *	using MDIO management frame structure and protocol(defined by ISO/IEC).
+ *	Please see SiS7014 or ICS spec
+ */
+
+static u16 mdio_read(struct net_device *net_dev, int phy_id, int location)
+{
+	long mdio_addr = net_dev->base_addr + mear;
+	int mii_cmd = MIIread|(phy_id<<MIIpmdShift)|(location<<MIIregShift);
+	u16 retval = 0;
+	int i;
+
+	mdio_reset(mdio_addr);
+	mdio_idle(mdio_addr);
+
+	for (i = 15; i >= 0; i--) {
+		int dataval = (mii_cmd & (1 << i)) ? MDDIR | MDIO : MDDIR;
+		outl(dataval, mdio_addr);
+		mdio_delay();
+		outl(dataval | MDC, mdio_addr);
+		mdio_delay();
+	}
+
+	/* Read the 16 data bits. */
+	for (i = 16; i > 0; i--) {
+		outl(0, mdio_addr);
+		mdio_delay();
+		retval = (retval << 1) | ((inl(mdio_addr) & MDIO) ? 1 : 0);
+		outl(MDC, mdio_addr);
+		mdio_delay();
+	}
+	outl(0x00, mdio_addr);
+
+	return retval;
+}
+
+/**
+ *	mdio_write - write MII PHY register
+ *	@net_dev: the net device to write
+ *	@phy_id: the phy address to write
+ *	@location: the phy regiester id to write
+ *	@value: the register value to write with
+ *
+ *	Write MII registers with @value through MDIO and MDC
+ *	using MDIO management frame structure and protocol(defined by ISO/IEC)
+ *	please see SiS7014 or ICS spec
+ */
+
+static void mdio_write(struct net_device *net_dev, int phy_id, int location,
+			int value)
+{
+	long mdio_addr = net_dev->base_addr + mear;
+	int mii_cmd = MIIwrite|(phy_id<<MIIpmdShift)|(location<<MIIregShift);
+	int i;
+
+	mdio_reset(mdio_addr);
+	mdio_idle(mdio_addr);
+
+	/* Shift the command bits out. */
+	for (i = 15; i >= 0; i--) {
+		int dataval = (mii_cmd & (1 << i)) ? MDDIR | MDIO : MDDIR;
+		outb(dataval, mdio_addr);
+		mdio_delay();
+		outb(dataval | MDC, mdio_addr);
+		mdio_delay();
+	}
+	mdio_delay();
+
+	/* Shift the value bits out. */
+	for (i = 15; i >= 0; i--) {
+		int dataval = (value & (1 << i)) ? MDDIR | MDIO : MDDIR;
+		outl(dataval, mdio_addr);
+		mdio_delay();
+		outl(dataval | MDC, mdio_addr);
+		mdio_delay();
+	}
+	mdio_delay();
+
+	/* Clear out extra bits. */
+	for (i = 2; i > 0; i--) {
+		outb(0, mdio_addr);
+		mdio_delay();
+		outb(MDC, mdio_addr);
+		mdio_delay();
+	}
+	outl(0x00, mdio_addr);
+
+	return;
+}
+
+
+/**
+ *	sis900_reset_phy - reset sis900 mii phy.
+ *	@net_dev: the net device to write
+ *	@phy_addr: default phy address
+ *
+ *	Some specific phy can't work properly without reset.
+ *	This function will be called during initialization and
+ *	link status change from ON to DOWN.
+ */
+
+static u16 sis900_reset_phy(struct net_device *net_dev, int phy_addr)
+{
+	int i = 0;
+	u16 status;
+
+	while (i++ < 2)
+		status = mdio_read(net_dev, phy_addr, MII_STATUS);
+
+	mdio_write( net_dev, phy_addr, MII_CONTROL, MII_CNTL_RESET );
+	
+	return status;
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+/*
+ * Polling 'interrupt' - used by things like netconsole to send skbs
+ * without having to re-enable interrupts. It's not called while
+ * the interrupt routine is executing.
+*/
+static void sis900_poll(struct net_device *dev)
+{
+	disable_irq(dev->irq);
+	sis900_interrupt(dev->irq, dev, NULL);
+	enable_irq(dev->irq);
+}
+#endif
+
+/**
+ *	sis900_open - open sis900 device
+ *	@net_dev: the net device to open
+ *
+ *	Do some initialization and start net interface.
+ *	enable interrupts and set sis900 timer.
+ */
+
+static int
+sis900_open(struct net_device *net_dev)
+{
+	struct sis900_private *sis_priv = net_dev->priv;
+	long ioaddr = net_dev->base_addr;
+	int ret;
+
+	/* Soft reset the chip. */
+	sis900_reset(net_dev);
+
+	/* Equalizer workaround Rule */
+	sis630_set_eq(net_dev, sis_priv->chipset_rev);
+
+	ret = request_irq(net_dev->irq, &sis900_interrupt, SA_SHIRQ,
+						net_dev->name, net_dev);
+	if (ret)
+		return ret;
+
+	sis900_init_rxfilter(net_dev);
+
+	sis900_init_tx_ring(net_dev);
+	sis900_init_rx_ring(net_dev);
+
+	set_rx_mode(net_dev);
+
+	netif_start_queue(net_dev);
+
+	/* Workaround for EDB */
+	sis900_set_mode(ioaddr, HW_SPEED_10_MBPS, FDX_CAPABLE_HALF_SELECTED);
+
+	/* Enable all known interrupts by setting the interrupt mask. */
+	outl((RxSOVR|RxORN|RxERR|RxOK|TxURN|TxERR|TxIDLE), ioaddr + imr);
+	outl(RxENA | inl(ioaddr + cr), ioaddr + cr);
+	outl(IE, ioaddr + ier);
+
+	sis900_check_mode(net_dev, sis_priv->mii);
+
+	/* Set the timer to switch to check for link beat and perhaps switch
+	   to an alternate media type. */
+	init_timer(&sis_priv->timer);
+	sis_priv->timer.expires = jiffies + HZ;
+	sis_priv->timer.data = (unsigned long)net_dev;
+	sis_priv->timer.function = &sis900_timer;
+	add_timer(&sis_priv->timer);
+
+	return 0;
+}
+
+/**
+ *	sis900_init_rxfilter - Initialize the Rx filter
+ *	@net_dev: the net device to initialize for
+ *
+ *	Set receive filter address to our MAC address
+ *	and enable packet filtering.
+ */
+
+static void
+sis900_init_rxfilter (struct net_device * net_dev)
+{
+	struct sis900_private *sis_priv = net_dev->priv;
+	long ioaddr = net_dev->base_addr;
+	u32 rfcrSave;
+	u32 i;
+
+	rfcrSave = inl(rfcr + ioaddr);
+
+	/* disable packet filtering before setting filter */
+	outl(rfcrSave & ~RFEN, rfcr + ioaddr);
+
+	/* load MAC addr to filter data register */
+	for (i = 0 ; i < 3 ; i++) {
+		u32 w;
+
+		w = (u32) *((u16 *)(net_dev->dev_addr)+i);
+		outl((i << RFADDR_shift), ioaddr + rfcr);
+		outl(w, ioaddr + rfdr);
+
+		if (netif_msg_hw(sis_priv)) {
+			printk(KERN_DEBUG "%s: Receive Filter Addrss[%d]=%x\n",
+			       net_dev->name, i, inl(ioaddr + rfdr));
+		}
+	}
+
+	/* enable packet filtering */
+	outl(rfcrSave | RFEN, rfcr + ioaddr);
+}
+
+/**
+ *	sis900_init_tx_ring - Initialize the Tx descriptor ring
+ *	@net_dev: the net device to initialize for
+ *
+ *	Initialize the Tx descriptor ring, 
+ */
+
+static void
+sis900_init_tx_ring(struct net_device *net_dev)
+{
+	struct sis900_private *sis_priv = net_dev->priv;
+	long ioaddr = net_dev->base_addr;
+	int i;
+
+	sis_priv->tx_full = 0;
+	sis_priv->dirty_tx = sis_priv->cur_tx = 0;
+
+	for (i = 0; i < NUM_TX_DESC; i++) {
+		sis_priv->tx_skbuff[i] = NULL;
+
+		sis_priv->tx_ring[i].link = sis_priv->tx_ring_dma +
+			((i+1)%NUM_TX_DESC)*sizeof(BufferDesc);
+		sis_priv->tx_ring[i].cmdsts = 0;
+		sis_priv->tx_ring[i].bufptr = 0;
+	}
+
+	/* load Transmit Descriptor Register */
+	outl(sis_priv->tx_ring_dma, ioaddr + txdp);
+	if (netif_msg_hw(sis_priv))
+		printk(KERN_DEBUG "%s: TX descriptor register loaded with: %8.8x\n",
+		       net_dev->name, inl(ioaddr + txdp));
+}
+
+/**
+ *	sis900_init_rx_ring - Initialize the Rx descriptor ring
+ *	@net_dev: the net device to initialize for
+ *
+ *	Initialize the Rx descriptor ring, 
+ *	and pre-allocate recevie buffers (socket buffer)
+ */
+
+static void 
+sis900_init_rx_ring(struct net_device *net_dev)
+{
+	struct sis900_private *sis_priv = net_dev->priv;
+	long ioaddr = net_dev->base_addr;
+	int i;
+
+	sis_priv->cur_rx = 0;
+	sis_priv->dirty_rx = 0;
+
+	/* init RX descriptor */
+	for (i = 0; i < NUM_RX_DESC; i++) {
+		sis_priv->rx_skbuff[i] = NULL;
+
+		sis_priv->rx_ring[i].link = sis_priv->rx_ring_dma +
+			((i+1)%NUM_RX_DESC)*sizeof(BufferDesc);
+		sis_priv->rx_ring[i].cmdsts = 0;
+		sis_priv->rx_ring[i].bufptr = 0;
+	}
+
+	/* allocate sock buffers */
+	for (i = 0; i < NUM_RX_DESC; i++) {
+		struct sk_buff *skb;
+
+		if ((skb = dev_alloc_skb(RX_BUF_SIZE)) == NULL) {
+			/* not enough memory for skbuff, this makes a "hole"
+			   on the buffer ring, it is not clear how the
+			   hardware will react to this kind of degenerated
+			   buffer */
+			break;
+		}
+		skb->dev = net_dev;
+		sis_priv->rx_skbuff[i] = skb;
+		sis_priv->rx_ring[i].cmdsts = RX_BUF_SIZE;
+                sis_priv->rx_ring[i].bufptr = pci_map_single(sis_priv->pci_dev,
+                        skb->tail, RX_BUF_SIZE, PCI_DMA_FROMDEVICE);
+	}
+	sis_priv->dirty_rx = (unsigned int) (i - NUM_RX_DESC);
+
+	/* load Receive Descriptor Register */
+	outl(sis_priv->rx_ring_dma, ioaddr + rxdp);
+	if (netif_msg_hw(sis_priv))
+		printk(KERN_DEBUG "%s: RX descriptor register loaded with: %8.8x\n",
+		       net_dev->name, inl(ioaddr + rxdp));
+}
+
+/**
+ *	sis630_set_eq - set phy equalizer value for 630 LAN
+ *	@net_dev: the net device to set equalizer value
+ *	@revision: 630 LAN revision number
+ *
+ *	630E equalizer workaround rule(Cyrus Huang 08/15)
+ *	PHY register 14h(Test)
+ *	Bit 14: 0 -- Automatically dectect (default)
+ *		1 -- Manually set Equalizer filter
+ *	Bit 13: 0 -- (Default)
+ *		1 -- Speed up convergence of equalizer setting
+ *	Bit 9 : 0 -- (Default)
+ *		1 -- Disable Baseline Wander
+ *	Bit 3~7   -- Equalizer filter setting
+ *	Link ON: Set Bit 9, 13 to 1, Bit 14 to 0
+ *	Then calculate equalizer value
+ *	Then set equalizer value, and set Bit 14 to 1, Bit 9 to 0
+ *	Link Off:Set Bit 13 to 1, Bit 14 to 0
+ *	Calculate Equalizer value:
+ *	When Link is ON and Bit 14 is 0, SIS900PHY will auto-dectect proper equalizer value.
+ *	When the equalizer is stable, this value is not a fixed value. It will be within
+ *	a small range(eg. 7~9). Then we get a minimum and a maximum value(eg. min=7, max=9)
+ *	0 <= max <= 4  --> set equalizer to max
+ *	5 <= max <= 14 --> set equalizer to max+1 or set equalizer to max+2 if max == min
+ *	max >= 15      --> set equalizer to max+5 or set equalizer to max+6 if max == min
+ */
+
+static void sis630_set_eq(struct net_device *net_dev, u8 revision)
+{
+	struct sis900_private *sis_priv = net_dev->priv;
+	u16 reg14h, eq_value=0, max_value=0, min_value=0;
+	int i, maxcount=10;
+
+	if ( !(revision == SIS630E_900_REV || revision == SIS630EA1_900_REV ||
+	       revision == SIS630A_900_REV || revision ==  SIS630ET_900_REV) )
+		return;
+
+	if (netif_carrier_ok(net_dev)) {
+		reg14h = mdio_read(net_dev, sis_priv->cur_phy, MII_RESV);
+		mdio_write(net_dev, sis_priv->cur_phy, MII_RESV,
+					(0x2200 | reg14h) & 0xBFFF);
+		for (i=0; i < maxcount; i++) {
+			eq_value = (0x00F8 & mdio_read(net_dev,
+					sis_priv->cur_phy, MII_RESV)) >> 3;
+			if (i == 0)
+				max_value=min_value=eq_value;
+			max_value = (eq_value > max_value) ?
+						eq_value : max_value;
+			min_value = (eq_value < min_value) ?
+						eq_value : min_value;
+		}
+		/* 630E rule to determine the equalizer value */
+		if (revision == SIS630E_900_REV || revision == SIS630EA1_900_REV ||
+		    revision == SIS630ET_900_REV) {
+			if (max_value < 5)
+				eq_value = max_value;
+			else if (max_value >= 5 && max_value < 15)
+				eq_value = (max_value == min_value) ?
+						max_value+2 : max_value+1;
+			else if (max_value >= 15)
+				eq_value=(max_value == min_value) ?
+						max_value+6 : max_value+5;
+		}
+		/* 630B0&B1 rule to determine the equalizer value */
+		if (revision == SIS630A_900_REV && 
+		    (sis_priv->host_bridge_rev == SIS630B0 || 
+		     sis_priv->host_bridge_rev == SIS630B1)) {
+			if (max_value == 0)
+				eq_value = 3;
+			else
+				eq_value = (max_value + min_value + 1)/2;
+		}
+		/* write equalizer value and setting */
+		reg14h = mdio_read(net_dev, sis_priv->cur_phy, MII_RESV);
+		reg14h = (reg14h & 0xFF07) | ((eq_value << 3) & 0x00F8);
+		reg14h = (reg14h | 0x6000) & 0xFDFF;
+		mdio_write(net_dev, sis_priv->cur_phy, MII_RESV, reg14h);
+	} else {
+		reg14h = mdio_read(net_dev, sis_priv->cur_phy, MII_RESV);
+		if (revision == SIS630A_900_REV && 
+		    (sis_priv->host_bridge_rev == SIS630B0 || 
+		     sis_priv->host_bridge_rev == SIS630B1)) 
+			mdio_write(net_dev, sis_priv->cur_phy, MII_RESV,
+						(reg14h | 0x2200) & 0xBFFF);
+		else
+			mdio_write(net_dev, sis_priv->cur_phy, MII_RESV,
+						(reg14h | 0x2000) & 0xBFFF);
+	}
+	return;
+}
+
+/**
+ *	sis900_timer - sis900 timer routine
+ *	@data: pointer to sis900 net device
+ *
+ *	On each timer ticks we check two things, 
+ *	link status (ON/OFF) and link mode (10/100/Full/Half)
+ */
+
+static void sis900_timer(unsigned long data)
+{
+	struct net_device *net_dev = (struct net_device *)data;
+	struct sis900_private *sis_priv = net_dev->priv;
+	struct mii_phy *mii_phy = sis_priv->mii;
+	static int next_tick = 5*HZ;
+	u16 status;
+
+	if (!sis_priv->autong_complete){
+		int speed, duplex = 0;
+
+		sis900_read_mode(net_dev, &speed, &duplex);
+		if (duplex){
+			sis900_set_mode(net_dev->base_addr, speed, duplex);
+			sis630_set_eq(net_dev, sis_priv->chipset_rev);
+			netif_start_queue(net_dev);
+		}
+
+		sis_priv->timer.expires = jiffies + HZ;
+		add_timer(&sis_priv->timer);
+		return;
+	}
+
+	status = mdio_read(net_dev, sis_priv->cur_phy, MII_STATUS);
+	status = mdio_read(net_dev, sis_priv->cur_phy, MII_STATUS);
+
+	/* Link OFF -> ON */
+	if (!netif_carrier_ok(net_dev)) {
+	LookForLink:
+		/* Search for new PHY */
+		status = sis900_default_phy(net_dev);
+		mii_phy = sis_priv->mii;
+
+		if (status & MII_STAT_LINK){
+			sis900_check_mode(net_dev, mii_phy);
+			netif_carrier_on(net_dev);
+		}
+	} else {
+	/* Link ON -> OFF */
+                if (!(status & MII_STAT_LINK)){
+                	netif_carrier_off(net_dev);
+			if(netif_msg_link(sis_priv))
+                		printk(KERN_INFO "%s: Media Link Off\n", net_dev->name);
+
+                	/* Change mode issue */
+                	if ((mii_phy->phy_id0 == 0x001D) && 
+			    ((mii_phy->phy_id1 & 0xFFF0) == 0x8000))
+               			sis900_reset_phy(net_dev,  sis_priv->cur_phy);
+  
+			sis630_set_eq(net_dev, sis_priv->chipset_rev);
+  
+                	goto LookForLink;
+                }
+	}
+
+	sis_priv->timer.expires = jiffies + next_tick;
+	add_timer(&sis_priv->timer);
+}
+
+/**
+ *	sis900_check_mode - check the media mode for sis900
+ *	@net_dev: the net device to be checked
+ *	@mii_phy: the mii phy
+ *
+ *	Older driver gets the media mode from mii status output
+ *	register. Now we set our media capability and auto-negotiate
+ *	to get the upper bound of speed and duplex between two ends.
+ *	If the types of mii phy is HOME, it doesn't need to auto-negotiate
+ *	and autong_complete should be set to 1.
+ */
+
+static void sis900_check_mode(struct net_device *net_dev, struct mii_phy *mii_phy)
+{
+	struct sis900_private *sis_priv = net_dev->priv;
+	long ioaddr = net_dev->base_addr;
+	int speed, duplex;
+
+	if (mii_phy->phy_types == LAN) {
+		outl(~EXD & inl(ioaddr + cfg), ioaddr + cfg);
+		sis900_set_capability(net_dev , mii_phy);
+		sis900_auto_negotiate(net_dev, sis_priv->cur_phy);
+	} else {
+		outl(EXD | inl(ioaddr + cfg), ioaddr + cfg);
+		speed = HW_SPEED_HOME;
+		duplex = FDX_CAPABLE_HALF_SELECTED;
+		sis900_set_mode(ioaddr, speed, duplex);
+		sis_priv->autong_complete = 1;
+	}
+}
+
+/**
+ *	sis900_set_mode - Set the media mode of mac register.
+ *	@ioaddr: the address of the device
+ *	@speed : the transmit speed to be determined
+ *	@duplex: the duplex mode to be determined
+ *
+ *	Set the media mode of mac register txcfg/rxcfg according to
+ *	speed and duplex of phy. Bit EDB_MASTER_EN indicates the EDB
+ *	bus is used instead of PCI bus. When this bit is set 1, the
+ *	Max DMA Burst Size for TX/RX DMA should be no larger than 16
+ *	double words.
+ */
+
+static void sis900_set_mode (long ioaddr, int speed, int duplex)
+{
+	u32 tx_flags = 0, rx_flags = 0;
+
+	if (inl(ioaddr + cfg) & EDB_MASTER_EN) {
+		tx_flags = TxATP | (DMA_BURST_64 << TxMXDMA_shift) |
+					(TX_FILL_THRESH << TxFILLT_shift);
+		rx_flags = DMA_BURST_64 << RxMXDMA_shift;
+	} else {
+		tx_flags = TxATP | (DMA_BURST_512 << TxMXDMA_shift) |
+					(TX_FILL_THRESH << TxFILLT_shift);
+		rx_flags = DMA_BURST_512 << RxMXDMA_shift;
+	}
+
+	if (speed == HW_SPEED_HOME || speed == HW_SPEED_10_MBPS) {
+		rx_flags |= (RxDRNT_10 << RxDRNT_shift);
+		tx_flags |= (TxDRNT_10 << TxDRNT_shift);
+	} else {
+		rx_flags |= (RxDRNT_100 << RxDRNT_shift);
+		tx_flags |= (TxDRNT_100 << TxDRNT_shift);
+	}
+
+	if (duplex == FDX_CAPABLE_FULL_SELECTED) {
+		tx_flags |= (TxCSI | TxHBI);
+		rx_flags |= RxATX;
+	}
+
+	outl (tx_flags, ioaddr + txcfg);
+	outl (rx_flags, ioaddr + rxcfg);
+}
+
+/**
+ *	sis900_auto_negotiate - Set the Auto-Negotiation Enable/Reset bit.
+ *	@net_dev: the net device to read mode for
+ *	@phy_addr: mii phy address
+ *
+ *	If the adapter is link-on, set the auto-negotiate enable/reset bit.
+ *	autong_complete should be set to 0 when starting auto-negotiation.
+ *	autong_complete should be set to 1 if we didn't start auto-negotiation.
+ *	sis900_timer will wait for link on again if autong_complete = 0.
+ */
+
+static void sis900_auto_negotiate(struct net_device *net_dev, int phy_addr)
+{
+	struct sis900_private *sis_priv = net_dev->priv;
+	int i = 0;
+	u32 status;
+	
+	while (i++ < 2)
+		status = mdio_read(net_dev, phy_addr, MII_STATUS);
+
+	if (!(status & MII_STAT_LINK)){
+		if(netif_msg_link(sis_priv))
+			printk(KERN_INFO "%s: Media Link Off\n", net_dev->name);
+		sis_priv->autong_complete = 1;
+		netif_carrier_off(net_dev);
+		return;
+	}
+
+	/* (Re)start AutoNegotiate */
+	mdio_write(net_dev, phy_addr, MII_CONTROL,
+		   MII_CNTL_AUTO | MII_CNTL_RST_AUTO);
+	sis_priv->autong_complete = 0;
+}
+
+
+/**
+ *	sis900_read_mode - read media mode for sis900 internal phy
+ *	@net_dev: the net device to read mode for
+ *	@speed  : the transmit speed to be determined
+ *	@duplex : the duplex mode to be determined
+ *
+ *	The capability of remote end will be put in mii register autorec
+ *	after auto-negotiation. Use AND operation to get the upper bound
+ *	of speed and duplex between two ends.
+ */
+
+static void sis900_read_mode(struct net_device *net_dev, int *speed, int *duplex)
+{
+	struct sis900_private *sis_priv = net_dev->priv;
+	struct mii_phy *phy = sis_priv->mii;
+	int phy_addr = sis_priv->cur_phy;
+	u32 status;
+	u16 autoadv, autorec;
+	int i = 0;
+
+	while (i++ < 2)
+		status = mdio_read(net_dev, phy_addr, MII_STATUS);
+
+	if (!(status & MII_STAT_LINK))
+		return;
+
+	/* AutoNegotiate completed */
+	autoadv = mdio_read(net_dev, phy_addr, MII_ANADV);
+	autorec = mdio_read(net_dev, phy_addr, MII_ANLPAR);
+	status = autoadv & autorec;
+	
+	*speed = HW_SPEED_10_MBPS;
+	*duplex = FDX_CAPABLE_HALF_SELECTED;
+
+	if (status & (MII_NWAY_TX | MII_NWAY_TX_FDX))
+		*speed = HW_SPEED_100_MBPS;
+	if (status & ( MII_NWAY_TX_FDX | MII_NWAY_T_FDX))
+		*duplex = FDX_CAPABLE_FULL_SELECTED;
+	
+	sis_priv->autong_complete = 1;
+
+	/* Workaround for Realtek RTL8201 PHY issue */
+	if ((phy->phy_id0 == 0x0000) && ((phy->phy_id1 & 0xFFF0) == 0x8200)) {
+		if (mdio_read(net_dev, phy_addr, MII_CONTROL) & MII_CNTL_FDX)
+			*duplex = FDX_CAPABLE_FULL_SELECTED;
+		if (mdio_read(net_dev, phy_addr, 0x0019) & 0x01)
+			*speed = HW_SPEED_100_MBPS;
+	}
+
+	if(netif_msg_link(sis_priv))
+		printk(KERN_INFO "%s: Media Link On %s %s-duplex \n",
+	       				net_dev->name,
+	       				*speed == HW_SPEED_100_MBPS ?
+	       					"100mbps" : "10mbps",
+	       				*duplex == FDX_CAPABLE_FULL_SELECTED ?
+	       					"full" : "half");
+}
+
+/**
+ *	sis900_tx_timeout - sis900 transmit timeout routine
+ *	@net_dev: the net device to transmit
+ *
+ *	print transmit timeout status
+ *	disable interrupts and do some tasks
+ */
+
+static void sis900_tx_timeout(struct net_device *net_dev)
+{
+	struct sis900_private *sis_priv = net_dev->priv;
+	long ioaddr = net_dev->base_addr;
+	unsigned long flags;
+	int i;
+
+	if(netif_msg_tx_err(sis_priv))
+		printk(KERN_INFO "%s: Transmit timeout, status %8.8x %8.8x \n",
+	       		net_dev->name, inl(ioaddr + cr), inl(ioaddr + isr));
+
+	/* Disable interrupts by clearing the interrupt mask. */
+	outl(0x0000, ioaddr + imr);
+
+	/* use spinlock to prevent interrupt handler accessing buffer ring */
+	spin_lock_irqsave(&sis_priv->lock, flags);
+
+	/* discard unsent packets */
+	sis_priv->dirty_tx = sis_priv->cur_tx = 0;
+	for (i = 0; i < NUM_TX_DESC; i++) {
+		struct sk_buff *skb = sis_priv->tx_skbuff[i];
+
+		if (skb) {
+			pci_unmap_single(sis_priv->pci_dev, 
+				sis_priv->tx_ring[i].bufptr, skb->len,
+				PCI_DMA_TODEVICE);
+			dev_kfree_skb_irq(skb);
+			sis_priv->tx_skbuff[i] = NULL;
+			sis_priv->tx_ring[i].cmdsts = 0;
+			sis_priv->tx_ring[i].bufptr = 0;
+			sis_priv->stats.tx_dropped++;
+		}
+	}
+	sis_priv->tx_full = 0;
+	netif_wake_queue(net_dev);
+
+	spin_unlock_irqrestore(&sis_priv->lock, flags);
+
+	net_dev->trans_start = jiffies;
+
+	/* load Transmit Descriptor Register */
+	outl(sis_priv->tx_ring_dma, ioaddr + txdp);
+
+	/* Enable all known interrupts by setting the interrupt mask. */
+	outl((RxSOVR|RxORN|RxERR|RxOK|TxURN|TxERR|TxIDLE), ioaddr + imr);
+	return;
+}
+
+/**
+ *	sis900_start_xmit - sis900 start transmit routine
+ *	@skb: socket buffer pointer to put the data being transmitted
+ *	@net_dev: the net device to transmit with
+ *
+ *	Set the transmit buffer descriptor, 
+ *	and write TxENA to enable transmit state machine.
+ *	tell upper layer if the buffer is full
+ */
+
+static int
+sis900_start_xmit(struct sk_buff *skb, struct net_device *net_dev)
+{
+	struct sis900_private *sis_priv = net_dev->priv;
+	long ioaddr = net_dev->base_addr;
+	unsigned int  entry;
+	unsigned long flags;
+	unsigned int  index_cur_tx, index_dirty_tx;
+	unsigned int  count_dirty_tx;
+
+	/* Don't transmit data before the complete of auto-negotiation */
+	if(!sis_priv->autong_complete){
+		netif_stop_queue(net_dev);
+		return 1;
+	}
+
+	spin_lock_irqsave(&sis_priv->lock, flags);
+
+	/* Calculate the next Tx descriptor entry. */
+	entry = sis_priv->cur_tx % NUM_TX_DESC;
+	sis_priv->tx_skbuff[entry] = skb;
+
+	/* set the transmit buffer descriptor and enable Transmit State Machine */
+	sis_priv->tx_ring[entry].bufptr = pci_map_single(sis_priv->pci_dev,
+		skb->data, skb->len, PCI_DMA_TODEVICE);
+	sis_priv->tx_ring[entry].cmdsts = (OWN | skb->len);
+	outl(TxENA | inl(ioaddr + cr), ioaddr + cr);
+
+	sis_priv->cur_tx ++;
+	index_cur_tx = sis_priv->cur_tx;
+	index_dirty_tx = sis_priv->dirty_tx;
+
+	for (count_dirty_tx = 0; index_cur_tx != index_dirty_tx; index_dirty_tx++)
+		count_dirty_tx ++;
+
+	if (index_cur_tx == index_dirty_tx) {
+		/* dirty_tx is met in the cycle of cur_tx, buffer full */
+		sis_priv->tx_full = 1;
+		netif_stop_queue(net_dev);
+	} else if (count_dirty_tx < NUM_TX_DESC) { 
+		/* Typical path, tell upper layer that more transmission is possible */
+		netif_start_queue(net_dev);
+	} else {
+		/* buffer full, tell upper layer no more transmission */
+		sis_priv->tx_full = 1;
+		netif_stop_queue(net_dev);
+	}
+
+	spin_unlock_irqrestore(&sis_priv->lock, flags);
+
+	net_dev->trans_start = jiffies;
+
+	if (netif_msg_tx_queued(sis_priv))
+		printk(KERN_DEBUG "%s: Queued Tx packet at %p size %d "
+		       "to slot %d.\n",
+		       net_dev->name, skb->data, (int)skb->len, entry);
+
+	return 0;
+}
+
+/**
+ *	sis900_interrupt - sis900 interrupt handler
+ *	@irq: the irq number
+ *	@dev_instance: the client data object
+ *	@regs: snapshot of processor context
+ *
+ *	The interrupt handler does all of the Rx thread work, 
+ *	and cleans up after the Tx thread
+ */
+
+static irqreturn_t sis900_interrupt(int irq, void *dev_instance, struct pt_regs *regs)
+{
+	struct net_device *net_dev = dev_instance;
+	struct sis900_private *sis_priv = net_dev->priv;
+	int boguscnt = max_interrupt_work;
+	long ioaddr = net_dev->base_addr;
+	u32 status;
+	unsigned int handled = 0;
+
+	spin_lock (&sis_priv->lock);
+
+	do {
+		status = inl(ioaddr + isr);
+
+		if ((status & (HIBERR|TxURN|TxERR|TxIDLE|RxORN|RxERR|RxOK)) == 0)
+			/* nothing intresting happened */
+			break;
+		handled = 1;
+
+		/* why dow't we break after Tx/Rx case ?? keyword: full-duplex */
+		if (status & (RxORN | RxERR | RxOK))
+			/* Rx interrupt */
+			sis900_rx(net_dev);
+
+		if (status & (TxURN | TxERR | TxIDLE))
+			/* Tx interrupt */
+			sis900_finish_xmit(net_dev);
+
+		/* something strange happened !!! */
+		if (status & HIBERR) {
+			if(netif_msg_intr(sis_priv))
+				printk(KERN_INFO "%s: Abnormal interrupt,"
+					"status %#8.8x.\n", net_dev->name, status);
+			break;
+		}
+		if (--boguscnt < 0) {
+			if(netif_msg_intr(sis_priv))
+				printk(KERN_INFO "%s: Too much work at interrupt, "
+					"interrupt status = %#8.8x.\n",
+					net_dev->name, status);
+			break;
+		}
+	} while (1);
+
+	if(netif_msg_intr(sis_priv))
+		printk(KERN_DEBUG "%s: exiting interrupt, "
+		       "interrupt status = 0x%#8.8x.\n",
+		       net_dev->name, inl(ioaddr + isr));
+	
+	spin_unlock (&sis_priv->lock);
+	return IRQ_RETVAL(handled);
+}
+
+/**
+ *	sis900_rx - sis900 receive routine
+ *	@net_dev: the net device which receives data
+ *
+ *	Process receive interrupt events, 
+ *	put buffer to higher layer and refill buffer pool
+ *	Note: This fucntion is called by interrupt handler, 
+ *	don't do "too much" work here
+ */
+
+static int sis900_rx(struct net_device *net_dev)
+{
+	struct sis900_private *sis_priv = net_dev->priv;
+	long ioaddr = net_dev->base_addr;
+	unsigned int entry = sis_priv->cur_rx % NUM_RX_DESC;
+	u32 rx_status = sis_priv->rx_ring[entry].cmdsts;
+
+	if (netif_msg_rx_status(sis_priv))
+		printk(KERN_DEBUG "sis900_rx, cur_rx:%4.4d, dirty_rx:%4.4d "
+		       "status:0x%8.8x\n",
+		       sis_priv->cur_rx, sis_priv->dirty_rx, rx_status);
+
+	while (rx_status & OWN) {
+		unsigned int rx_size;
+
+		rx_size = (rx_status & DSIZE) - CRC_SIZE;
+
+		if (rx_status & (ABORT|OVERRUN|TOOLONG|RUNT|RXISERR|CRCERR|FAERR)) {
+			/* corrupted packet received */
+			if (netif_msg_rx_err(sis_priv))
+				printk(KERN_DEBUG "%s: Corrupted packet "
+				       "received, buffer status = 0x%8.8x.\n",
+				       net_dev->name, rx_status);
+			sis_priv->stats.rx_errors++;
+			if (rx_status & OVERRUN)
+				sis_priv->stats.rx_over_errors++;
+			if (rx_status & (TOOLONG|RUNT))
+				sis_priv->stats.rx_length_errors++;
+			if (rx_status & (RXISERR | FAERR))
+				sis_priv->stats.rx_frame_errors++;
+			if (rx_status & CRCERR) 
+				sis_priv->stats.rx_crc_errors++;
+			/* reset buffer descriptor state */
+			sis_priv->rx_ring[entry].cmdsts = RX_BUF_SIZE;
+		} else {
+			struct sk_buff * skb;
+
+			/* This situation should never happen, but due to
+			   some unknow bugs, it is possible that
+			   we are working on NULL sk_buff :-( */
+			if (sis_priv->rx_skbuff[entry] == NULL) {
+				if (netif_msg_rx_err(sis_priv))
+					printk(KERN_INFO "%s: NULL pointer " 
+						"encountered in Rx ring, skipping\n",
+						net_dev->name);
+				break;
+			}
+
+			pci_unmap_single(sis_priv->pci_dev, 
+				sis_priv->rx_ring[entry].bufptr, RX_BUF_SIZE, 
+				PCI_DMA_FROMDEVICE);
+			/* give the socket buffer to upper layers */
+			skb = sis_priv->rx_skbuff[entry];
+			skb_put(skb, rx_size);
+			skb->protocol = eth_type_trans(skb, net_dev);
+			netif_rx(skb);
+
+			/* some network statistics */
+			if ((rx_status & BCAST) == MCAST)
+				sis_priv->stats.multicast++;
+			net_dev->last_rx = jiffies;
+			sis_priv->stats.rx_bytes += rx_size;
+			sis_priv->stats.rx_packets++;
+
+			/* refill the Rx buffer, what if there is not enought
+			 * memory for new socket buffer ?? */
+			if ((skb = dev_alloc_skb(RX_BUF_SIZE)) == NULL) {
+				/* not enough memory for skbuff, this makes a
+				 * "hole" on the buffer ring, it is not clear
+				 * how the hardware will react to this kind
+				 * of degenerated buffer */
+				if (netif_msg_rx_status(sis_priv))
+					printk(KERN_INFO "%s: Memory squeeze,"
+						"deferring packet.\n",
+						net_dev->name);
+				sis_priv->rx_skbuff[entry] = NULL;
+				/* reset buffer descriptor state */
+				sis_priv->rx_ring[entry].cmdsts = 0;
+				sis_priv->rx_ring[entry].bufptr = 0;
+				sis_priv->stats.rx_dropped++;
+				break;
+			}
+			skb->dev = net_dev;
+			sis_priv->rx_skbuff[entry] = skb;
+			sis_priv->rx_ring[entry].cmdsts = RX_BUF_SIZE;
+                	sis_priv->rx_ring[entry].bufptr = 
+				pci_map_single(sis_priv->pci_dev, skb->tail, 
+					RX_BUF_SIZE, PCI_DMA_FROMDEVICE);
+			sis_priv->dirty_rx++;
+		}
+		sis_priv->cur_rx++;
+		entry = sis_priv->cur_rx % NUM_RX_DESC;
+		rx_status = sis_priv->rx_ring[entry].cmdsts;
+	} // while
+
+	/* refill the Rx buffer, what if the rate of refilling is slower
+	 * than consuming ?? */
+	for (;sis_priv->cur_rx - sis_priv->dirty_rx > 0; sis_priv->dirty_rx++) {
+		struct sk_buff *skb;
+
+		entry = sis_priv->dirty_rx % NUM_RX_DESC;
+
+		if (sis_priv->rx_skbuff[entry] == NULL) {
+			if ((skb = dev_alloc_skb(RX_BUF_SIZE)) == NULL) {
+				/* not enough memory for skbuff, this makes a
+				 * "hole" on the buffer ring, it is not clear
+				 * how the hardware will react to this kind
+				 * of degenerated buffer */
+				if (netif_msg_rx_err(sis_priv))
+					printk(KERN_INFO "%s: Memory squeeze,"
+						"deferring packet.\n",
+						net_dev->name);
+				sis_priv->stats.rx_dropped++;
+				break;
+			}
+			skb->dev = net_dev;
+			sis_priv->rx_skbuff[entry] = skb;
+			sis_priv->rx_ring[entry].cmdsts = RX_BUF_SIZE;
+                	sis_priv->rx_ring[entry].bufptr =
+				pci_map_single(sis_priv->pci_dev, skb->tail,
+					RX_BUF_SIZE, PCI_DMA_FROMDEVICE);
+		}
+	}
+	/* re-enable the potentially idle receive state matchine */
+	outl(RxENA | inl(ioaddr + cr), ioaddr + cr );
+
+	return 0;
+}
+
+/**
+ *	sis900_finish_xmit - finish up transmission of packets
+ *	@net_dev: the net device to be transmitted on
+ *
+ *	Check for error condition and free socket buffer etc 
+ *	schedule for more transmission as needed
+ *	Note: This fucntion is called by interrupt handler, 
+ *	don't do "too much" work here
+ */
+
+static void sis900_finish_xmit (struct net_device *net_dev)
+{
+	struct sis900_private *sis_priv = net_dev->priv;
+
+	for (; sis_priv->dirty_tx != sis_priv->cur_tx; sis_priv->dirty_tx++) {
+		struct sk_buff *skb;
+		unsigned int entry;
+		u32 tx_status;
+
+		entry = sis_priv->dirty_tx % NUM_TX_DESC;
+		tx_status = sis_priv->tx_ring[entry].cmdsts;
+
+		if (tx_status & OWN) {
+			/* The packet is not transmitted yet (owned by hardware) !
+			 * Note: the interrupt is generated only when Tx Machine
+			 * is idle, so this is an almost impossible case */
+			break;
+		}
+
+		if (tx_status & (ABORT | UNDERRUN | OWCOLL)) {
+			/* packet unsuccessfully transmitted */
+			if (netif_msg_tx_err(sis_priv))
+				printk(KERN_DEBUG "%s: Transmit "
+				       "error, Tx status %8.8x.\n",
+				       net_dev->name, tx_status);
+			sis_priv->stats.tx_errors++;
+			if (tx_status & UNDERRUN)
+				sis_priv->stats.tx_fifo_errors++;
+			if (tx_status & ABORT)
+				sis_priv->stats.tx_aborted_errors++;
+			if (tx_status & NOCARRIER)
+				sis_priv->stats.tx_carrier_errors++;
+			if (tx_status & OWCOLL)
+				sis_priv->stats.tx_window_errors++;
+		} else {
+			/* packet successfully transmitted */
+			sis_priv->stats.collisions += (tx_status & COLCNT) >> 16;
+			sis_priv->stats.tx_bytes += tx_status & DSIZE;
+			sis_priv->stats.tx_packets++;
+		}
+		/* Free the original skb. */
+		skb = sis_priv->tx_skbuff[entry];
+		pci_unmap_single(sis_priv->pci_dev, 
+			sis_priv->tx_ring[entry].bufptr, skb->len,
+			PCI_DMA_TODEVICE);
+		dev_kfree_skb_irq(skb);
+		sis_priv->tx_skbuff[entry] = NULL;
+		sis_priv->tx_ring[entry].bufptr = 0;
+		sis_priv->tx_ring[entry].cmdsts = 0;
+	}
+
+	if (sis_priv->tx_full && netif_queue_stopped(net_dev) &&
+	    sis_priv->cur_tx - sis_priv->dirty_tx < NUM_TX_DESC - 4) {
+		/* The ring is no longer full, clear tx_full and schedule
+		 * more transmission by netif_wake_queue(net_dev) */
+		sis_priv->tx_full = 0;
+		netif_wake_queue (net_dev);
+	}
+}
+
+/**
+ *	sis900_close - close sis900 device 
+ *	@net_dev: the net device to be closed
+ *
+ *	Disable interrupts, stop the Tx and Rx Status Machine 
+ *	free Tx and RX socket buffer
+ */
+
+static int sis900_close(struct net_device *net_dev)
+{
+	long ioaddr = net_dev->base_addr;
+	struct sis900_private *sis_priv = net_dev->priv;
+	struct sk_buff *skb;
+	int i;
+
+	netif_stop_queue(net_dev);
+
+	/* Disable interrupts by clearing the interrupt mask. */
+	outl(0x0000, ioaddr + imr);
+	outl(0x0000, ioaddr + ier);
+
+	/* Stop the chip's Tx and Rx Status Machine */
+	outl(RxDIS | TxDIS | inl(ioaddr + cr), ioaddr + cr);
+
+	del_timer(&sis_priv->timer);
+
+	free_irq(net_dev->irq, net_dev);
+
+	/* Free Tx and RX skbuff */
+	for (i = 0; i < NUM_RX_DESC; i++) {
+		skb = sis_priv->rx_skbuff[i];
+		if (skb) {
+			pci_unmap_single(sis_priv->pci_dev, 
+				sis_priv->rx_ring[i].bufptr,
+				RX_BUF_SIZE, PCI_DMA_FROMDEVICE);
+			dev_kfree_skb(skb);
+			sis_priv->rx_skbuff[i] = NULL;
+		}
+	}
+	for (i = 0; i < NUM_TX_DESC; i++) {
+		skb = sis_priv->tx_skbuff[i];
+		if (skb) {
+			pci_unmap_single(sis_priv->pci_dev, 
+				sis_priv->tx_ring[i].bufptr, skb->len,
+				PCI_DMA_TODEVICE);
+			dev_kfree_skb(skb);
+			sis_priv->tx_skbuff[i] = NULL;
+		}
+	}
+
+	/* Green! Put the chip in low-power mode. */
+
+	return 0;
+}
+
+/**
+ *	sis900_get_drvinfo - Return information about driver
+ *	@net_dev: the net device to probe
+ *	@info: container for info returned
+ *
+ *	Process ethtool command such as "ehtool -i" to show information
+ */
+ 
+static void sis900_get_drvinfo(struct net_device *net_dev,
+			       struct ethtool_drvinfo *info)
+{
+ 	struct sis900_private *sis_priv = net_dev->priv;
+
+	strcpy (info->driver, SIS900_MODULE_NAME);
+	strcpy (info->version, SIS900_DRV_VERSION);
+	strcpy (info->bus_info, pci_name(sis_priv->pci_dev));
+}
+
+static u32 sis900_get_msglevel(struct net_device *net_dev)
+{
+	struct sis900_private *sis_priv = net_dev->priv;
+	return sis_priv->msg_enable;
+}
+  
+static void sis900_set_msglevel(struct net_device *net_dev, u32 value)
+{
+	struct sis900_private *sis_priv = net_dev->priv;
+	sis_priv->msg_enable = value;
+}
+
+static struct ethtool_ops sis900_ethtool_ops = {
+	.get_drvinfo 	= sis900_get_drvinfo,
+	.get_msglevel	= sis900_get_msglevel,
+	.set_msglevel	= sis900_set_msglevel,
+};
+
+/**
+ *	mii_ioctl - process MII i/o control command 
+ *	@net_dev: the net device to command for
+ *	@rq: parameter for command
+ *	@cmd: the i/o command
+ *
+ *	Process MII command like read/write MII register
+ */
+
+static int mii_ioctl(struct net_device *net_dev, struct ifreq *rq, int cmd)
+{
+	struct sis900_private *sis_priv = net_dev->priv;
+	struct mii_ioctl_data *data = if_mii(rq);
+
+	switch(cmd) {
+	case SIOCGMIIPHY:		/* Get address of MII PHY in use. */
+		data->phy_id = sis_priv->mii->phy_addr;
+		/* Fall Through */
+
+	case SIOCGMIIREG:		/* Read MII PHY register. */
+		data->val_out = mdio_read(net_dev, data->phy_id & 0x1f, data->reg_num & 0x1f);
+		return 0;
+
+	case SIOCSMIIREG:		/* Write MII PHY register. */
+		if (!capable(CAP_NET_ADMIN))
+			return -EPERM;
+		mdio_write(net_dev, data->phy_id & 0x1f, data->reg_num & 0x1f, data->val_in);
+		return 0;
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+/**
+ *	sis900_get_stats - Get sis900 read/write statistics 
+ *	@net_dev: the net device to get statistics for
+ *
+ *	get tx/rx statistics for sis900
+ */
+
+static struct net_device_stats *
+sis900_get_stats(struct net_device *net_dev)
+{
+	struct sis900_private *sis_priv = net_dev->priv;
+
+	return &sis_priv->stats;
+}
+
+/**
+ *	sis900_set_config - Set media type by net_device.set_config 
+ *	@dev: the net device for media type change
+ *	@map: ifmap passed by ifconfig
+ *
+ *	Set media type to 10baseT, 100baseT or 0(for auto) by ifconfig
+ *	we support only port changes. All other runtime configuration
+ *	changes will be ignored
+ */
+
+static int sis900_set_config(struct net_device *dev, struct ifmap *map)
+{    
+	struct sis900_private *sis_priv = dev->priv;
+	struct mii_phy *mii_phy = sis_priv->mii;
+        
+	u16 status;
+
+	if ((map->port != (u_char)(-1)) && (map->port != dev->if_port)) {
+		/* we switch on the ifmap->port field. I couldn't find anything
+		 * like a definition or standard for the values of that field.
+		 * I think the meaning of those values is device specific. But
+		 * since I would like to change the media type via the ifconfig
+		 * command I use the definition from linux/netdevice.h 
+		 * (which seems to be different from the ifport(pcmcia) definition) */
+		switch(map->port){
+		case IF_PORT_UNKNOWN: /* use auto here */   
+			dev->if_port = map->port;
+			/* we are going to change the media type, so the Link
+			 * will be temporary down and we need to reflect that
+			 * here. When the Link comes up again, it will be
+			 * sensed by the sis_timer procedure, which also does
+			 * all the rest for us */
+			netif_carrier_off(dev);
+                
+			/* read current state */
+			status = mdio_read(dev, mii_phy->phy_addr, MII_CONTROL);
+                
+			/* enable auto negotiation and reset the negotioation
+			 * (I don't really know what the auto negatiotiation
+			 * reset really means, but it sounds for me right to
+			 * do one here) */
+			mdio_write(dev, mii_phy->phy_addr,
+				   MII_CONTROL, status | MII_CNTL_AUTO | MII_CNTL_RST_AUTO);
+
+			break;
+            
+		case IF_PORT_10BASET: /* 10BaseT */         
+			dev->if_port = map->port;
+                
+			/* we are going to change the media type, so the Link
+			 * will be temporary down and we need to reflect that
+			 * here. When the Link comes up again, it will be
+			 * sensed by the sis_timer procedure, which also does
+			 * all the rest for us */
+			netif_carrier_off(dev);
+        
+			/* set Speed to 10Mbps */
+			/* read current state */
+			status = mdio_read(dev, mii_phy->phy_addr, MII_CONTROL);
+                
+			/* disable auto negotiation and force 10MBit mode*/
+			mdio_write(dev, mii_phy->phy_addr,
+				   MII_CONTROL, status & ~(MII_CNTL_SPEED |
+					MII_CNTL_AUTO));
+			break;
+            
+		case IF_PORT_100BASET: /* 100BaseT */
+		case IF_PORT_100BASETX: /* 100BaseTx */ 
+			dev->if_port = map->port;
+                
+			/* we are going to change the media type, so the Link
+			 * will be temporary down and we need to reflect that
+			 * here. When the Link comes up again, it will be
+			 * sensed by the sis_timer procedure, which also does
+			 * all the rest for us */
+			netif_carrier_off(dev);
+                
+			/* set Speed to 100Mbps */
+			/* disable auto negotiation and enable 100MBit Mode */
+			status = mdio_read(dev, mii_phy->phy_addr, MII_CONTROL);
+			mdio_write(dev, mii_phy->phy_addr,
+				   MII_CONTROL, (status & ~MII_CNTL_SPEED) |
+				   MII_CNTL_SPEED);
+                
+			break;
+            
+		case IF_PORT_10BASE2: /* 10Base2 */
+		case IF_PORT_AUI: /* AUI */
+		case IF_PORT_100BASEFX: /* 100BaseFx */
+                	/* These Modes are not supported (are they?)*/
+			return -EOPNOTSUPP;
+			break;
+            
+		default:
+			return -EINVAL;
+		}
+	}
+	return 0;
+}
+
+/**
+ *	sis900_mcast_bitnr - compute hashtable index 
+ *	@addr: multicast address
+ *	@revision: revision id of chip
+ *
+ *	SiS 900 uses the most sigificant 7 bits to index a 128 bits multicast
+ *	hash table, which makes this function a little bit different from other drivers
+ *	SiS 900 B0 & 635 M/B uses the most significat 8 bits to index 256 bits
+ *   	multicast hash table. 
+ */
+
+static inline u16 sis900_mcast_bitnr(u8 *addr, u8 revision)
+{
+
+	u32 crc = ether_crc(6, addr);
+
+	/* leave 8 or 7 most siginifant bits */
+	if ((revision >= SIS635A_900_REV) || (revision == SIS900B_900_REV))
+		return ((int)(crc >> 24));
+	else
+		return ((int)(crc >> 25));
+}
+
+/**
+ *	set_rx_mode - Set SiS900 receive mode 
+ *	@net_dev: the net device to be set
+ *
+ *	Set SiS900 receive mode for promiscuous, multicast, or broadcast mode.
+ *	And set the appropriate multicast filter.
+ *	Multicast hash table changes from 128 to 256 bits for 635M/B & 900B0.
+ */
+
+static void set_rx_mode(struct net_device *net_dev)
+{
+	long ioaddr = net_dev->base_addr;
+	struct sis900_private * sis_priv = net_dev->priv;
+	u16 mc_filter[16] = {0};	/* 256/128 bits multicast hash table */
+	int i, table_entries;
+	u32 rx_mode;
+
+	/* 635 Hash Table entires = 256(2^16) */
+	if((sis_priv->chipset_rev >= SIS635A_900_REV) ||
+			(sis_priv->chipset_rev == SIS900B_900_REV))
+		table_entries = 16;
+	else
+		table_entries = 8;
+
+	if (net_dev->flags & IFF_PROMISC) {
+		/* Accept any kinds of packets */
+		rx_mode = RFPromiscuous;
+		for (i = 0; i < table_entries; i++)
+			mc_filter[i] = 0xffff;
+	} else if ((net_dev->mc_count > multicast_filter_limit) ||
+		   (net_dev->flags & IFF_ALLMULTI)) {
+		/* too many multicast addresses or accept all multicast packet */
+		rx_mode = RFAAB | RFAAM;
+		for (i = 0; i < table_entries; i++)
+			mc_filter[i] = 0xffff;
+	} else {
+		/* Accept Broadcast packet, destination address matchs our
+		 * MAC address, use Receive Filter to reject unwanted MCAST
+		 * packets */
+		struct dev_mc_list *mclist;
+		rx_mode = RFAAB;
+		for (i = 0, mclist = net_dev->mc_list;
+			mclist && i < net_dev->mc_count;
+			i++, mclist = mclist->next) {
+			unsigned int bit_nr =
+				sis900_mcast_bitnr(mclist->dmi_addr, sis_priv->chipset_rev);
+			mc_filter[bit_nr >> 4] |= (1 << (bit_nr & 0xf));
+		}
+	}
+
+	/* update Multicast Hash Table in Receive Filter */
+	for (i = 0; i < table_entries; i++) {
+                /* why plus 0x04 ??, That makes the correct value for hash table. */
+		outl((u32)(0x00000004+i) << RFADDR_shift, ioaddr + rfcr);
+		outl(mc_filter[i], ioaddr + rfdr);
+	}
+
+	outl(RFEN | rx_mode, ioaddr + rfcr);
+
+	/* sis900 is capable of looping back packets at MAC level for
+	 * debugging purpose */
+	if (net_dev->flags & IFF_LOOPBACK) {
+		u32 cr_saved;
+		/* We must disable Tx/Rx before setting loopback mode */
+		cr_saved = inl(ioaddr + cr);
+		outl(cr_saved | TxDIS | RxDIS, ioaddr + cr);
+		/* enable loopback */
+		outl(inl(ioaddr + txcfg) | TxMLB, ioaddr + txcfg);
+		outl(inl(ioaddr + rxcfg) | RxATX, ioaddr + rxcfg);
+		/* restore cr */
+		outl(cr_saved, ioaddr + cr);
+	}
+
+	return;
+}
+
+/**
+ *	sis900_reset - Reset sis900 MAC 
+ *	@net_dev: the net device to reset
+ *
+ *	reset sis900 MAC and wait until finished
+ *	reset through command register
+ *	change backoff algorithm for 900B0 & 635 M/B
+ */
+
+static void sis900_reset(struct net_device *net_dev)
+{
+	struct sis900_private * sis_priv = net_dev->priv;
+	long ioaddr = net_dev->base_addr;
+	int i = 0;
+	u32 status = TxRCMP | RxRCMP;
+
+	outl(0, ioaddr + ier);
+	outl(0, ioaddr + imr);
+	outl(0, ioaddr + rfcr);
+
+	outl(RxRESET | TxRESET | RESET | inl(ioaddr + cr), ioaddr + cr);
+	
+	/* Check that the chip has finished the reset. */
+	while (status && (i++ < 1000)) {
+		status ^= (inl(isr + ioaddr) & status);
+	}
+
+	if( (sis_priv->chipset_rev >= SIS635A_900_REV) ||
+			(sis_priv->chipset_rev == SIS900B_900_REV) )
+		outl(PESEL | RND_CNT, ioaddr + cfg);
+	else
+		outl(PESEL, ioaddr + cfg);
+}
+
+/**
+ *	sis900_remove - Remove sis900 device 
+ *	@pci_dev: the pci device to be removed
+ *
+ *	remove and release SiS900 net device
+ */
+
+static void __devexit sis900_remove(struct pci_dev *pci_dev)
+{
+	struct net_device *net_dev = pci_get_drvdata(pci_dev);
+	struct sis900_private * sis_priv = net_dev->priv;
+	struct mii_phy *phy = NULL;
+
+	while (sis_priv->first_mii) {
+		phy = sis_priv->first_mii;
+		sis_priv->first_mii = phy->next;
+		kfree(phy);
+	}
+
+	pci_free_consistent(pci_dev, RX_TOTAL_SIZE, sis_priv->rx_ring,
+		sis_priv->rx_ring_dma);
+	pci_free_consistent(pci_dev, TX_TOTAL_SIZE, sis_priv->tx_ring,
+		sis_priv->tx_ring_dma);
+	unregister_netdev(net_dev);
+	free_netdev(net_dev);
+	pci_release_regions(pci_dev);
+	pci_set_drvdata(pci_dev, NULL);
+}
+
+#ifdef CONFIG_PM
+
+static int sis900_suspend(struct pci_dev *pci_dev, pm_message_t state)
+{
+	struct net_device *net_dev = pci_get_drvdata(pci_dev);
+	long ioaddr = net_dev->base_addr;
+
+	if(!netif_running(net_dev))
+		return 0;
+
+	netif_stop_queue(net_dev);
+	netif_device_detach(net_dev);
+
+	/* Stop the chip's Tx and Rx Status Machine */
+	outl(RxDIS | TxDIS | inl(ioaddr + cr), ioaddr + cr);
+
+	pci_set_power_state(pci_dev, PCI_D3hot);
+	pci_save_state(pci_dev);
+
+	return 0;
+}
+
+static int sis900_resume(struct pci_dev *pci_dev)
+{
+	struct net_device *net_dev = pci_get_drvdata(pci_dev);
+	struct sis900_private *sis_priv = net_dev->priv;
+	long ioaddr = net_dev->base_addr;
+
+	if(!netif_running(net_dev))
+		return 0;
+	pci_restore_state(pci_dev);
+	pci_set_power_state(pci_dev, PCI_D0);
+
+	sis900_init_rxfilter(net_dev);
+
+	sis900_init_tx_ring(net_dev);
+	sis900_init_rx_ring(net_dev);
+
+	set_rx_mode(net_dev);
+
+	netif_device_attach(net_dev);
+	netif_start_queue(net_dev);
+
+	/* Workaround for EDB */
+	sis900_set_mode(ioaddr, HW_SPEED_10_MBPS, FDX_CAPABLE_HALF_SELECTED);
+
+	/* Enable all known interrupts by setting the interrupt mask. */
+	outl((RxSOVR|RxORN|RxERR|RxOK|TxURN|TxERR|TxIDLE), ioaddr + imr);
+	outl(RxENA | inl(ioaddr + cr), ioaddr + cr);
+	outl(IE, ioaddr + ier);
+
+	sis900_check_mode(net_dev, sis_priv->mii);
+
+	return 0;
+}
+#endif /* CONFIG_PM */
+
+static struct pci_driver sis900_pci_driver = {
+	.name		= SIS900_MODULE_NAME,
+	.id_table	= sis900_pci_tbl,
+	.probe		= sis900_probe,
+	.remove		= __devexit_p(sis900_remove),
+#ifdef CONFIG_PM
+	.suspend	= sis900_suspend,
+	.resume		= sis900_resume,
+#endif /* CONFIG_PM */
+};
+
+static int __init sis900_init_module(void)
+{
+/* when a module, this is printed whether or not devices are found in probe */
+#ifdef MODULE
+	printk(version);
+#endif
+
+	return pci_module_init(&sis900_pci_driver);
+}
+
+static void __exit sis900_cleanup_module(void)
+{
+	pci_unregister_driver(&sis900_pci_driver);
+}
+
+module_init(sis900_init_module);
+module_exit(sis900_cleanup_module);
+