driver for Silan SC92031 netdev

This is a driver for the Silan SC92031/Rsltek 8139D NIC chip.

This chip is found on at least one counterfeit Encore ENL832-TX-RENT NIC
[1], which came with a mini-CD with the 2.4 driver.  A slightly older
version of the driver was found at [2].  The main difference between them
is that the newer one has a small bugfix in the RX path, a lot of
gratuitous renaming of functions, all the printable strings changed to show
as a "Rsltek 8139D" [sic], and a PCI ID of 8139 instead of 2031.  The
driver on this patch is a rewrite of the vendor drivers (based mostly on
the older one).

Changes from the previous patch sent to netdev:
- Use MMIO instead of PIO
- Changed TX bounce buffers allocation
- Use skb_copy_and_csum_dev
- Several small bug fixes
- Tested for more than just a few minutes each time

[1] See http://www.encore-usa.com/faq.php under ENL832-TX-RENT for more
    information
[2] Look for SL_LINUX.ZIP (which is really a .tar.gz) at
    http://broadbandforum.in/dataone_Intex_LAN_cardlinux-t4207-s15.html
[3] To compile on 2.6.17, simply add back the last argument to the
    interrupt handler in two places, and copy the boolean declarations
    from 2.6.19

[akpm@osdl.org: build fixes]
Signed-off-by: Cesar Eduardo Barros <cesarb@cesarb.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/net/Kconfig

@@ -1788,6 +1788,18 @@ config LAN_SAA9730
 	  workstations.
 	  See <http://www.semiconductors.philips.com/pip/SAA9730_flyer_1>.
 
+config SC92031
+	tristate "Silan SC92031 PCI Fast Ethernet Adapter driver (EXPERIMENTAL)"
+	depends on NET_PCI && PCI && EXPERIMENTAL
+	select CRC32
+	---help---
+	  This is a driver for the Fast Ethernet PCI network cards based on
+	  the Silan SC92031 chip (sometimes also called Rsltek 8139D). If you
+	  have one of these, say Y here.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called sc92031.  This is recommended.
+
 config NET_POCKET
 	bool "Pocket and portable adapters"
 	depends on NET_ETHERNET && PARPORT

drivers/net/Makefile

@@ -160,6 +160,7 @@ obj-$(CONFIG_APRICOT) += 82596.o
 obj-$(CONFIG_LASI_82596) += lasi_82596.o
 obj-$(CONFIG_MVME16x_NET) += 82596.o
 obj-$(CONFIG_BVME6000_NET) += 82596.o
+obj-$(CONFIG_SC92031) += sc92031.o
 
 # This is also a 82596 and should probably be merged
 obj-$(CONFIG_LP486E) += lp486e.o

drivers/net/sc92031.c

+/*  Silan SC92031 PCI Fast Ethernet Adapter driver
+ *
+ *  Based on vendor drivers:
+ *  Silan Fast Ethernet Netcard Driver:
+ *    MODULE_AUTHOR ("gaoyonghong");
+ *    MODULE_DESCRIPTION ("SILAN Fast Ethernet driver");
+ *    MODULE_LICENSE("GPL");
+ *  8139D Fast Ethernet driver:
+ *    (C) 2002 by gaoyonghong
+ *    MODULE_AUTHOR ("gaoyonghong");
+ *    MODULE_DESCRIPTION ("Rsltek 8139D PCI Fast Ethernet Adapter driver");
+ *    MODULE_LICENSE("GPL");
+ *  Both are almost identical and seem to be based on pci-skeleton.c
+ *
+ *  Rewritten for 2.6 by Cesar Eduardo Barros
+ */
+
+/* Note about set_mac_address: I don't know how to change the hardware
+ * matching, so you need to enable IFF_PROMISC when using it.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/pci.h>
+#include <linux/dma-mapping.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/crc32.h>
+
+#include <asm/irq.h>
+
+#define PCI_VENDOR_ID_SILAN		0x1904
+#define PCI_DEVICE_ID_SILAN_SC92031	0x2031
+#define PCI_DEVICE_ID_SILAN_8139D	0x8139
+
+#define SC92031_NAME "sc92031"
+#define SC92031_DESCRIPTION "Silan SC92031 PCI Fast Ethernet Adapter driver"
+#define SC92031_VERSION "2.0c"
+
+/* BAR 0 is MMIO, BAR 1 is PIO */
+#ifndef SC92031_USE_BAR
+#define SC92031_USE_BAR 0
+#endif
+
+/* Maximum number of multicast addresses to filter (vs. Rx-all-multicast). */
+static int multicast_filter_limit = 64;
+module_param(multicast_filter_limit, int, 0);
+MODULE_PARM_DESC(multicast_filter_limit,
+	"Maximum number of filtered multicast addresses");
+
+static int media;
+module_param(media, int, 0);
+MODULE_PARM_DESC(media, "Media type (0x00 = autodetect,"
+	" 0x01 = 10M half, 0x02 = 10M full,"
+	" 0x04 = 100M half, 0x08 = 100M full)");
+
+/* Size of the in-memory receive ring. */
+#define  RX_BUF_LEN_IDX  3 /* 0==8K, 1==16K, 2==32K, 3==64K ,4==128K*/
+#define  RX_BUF_LEN	(8192 << RX_BUF_LEN_IDX)
+
+/* Number of Tx descriptor registers. */
+#define  NUM_TX_DESC	   4
+
+/* max supported ethernet frame size -- must be at least (dev->mtu+14+4).*/
+#define  MAX_ETH_FRAME_SIZE	  1536
+
+/* Size of the Tx bounce buffers -- must be at least (dev->mtu+14+4). */
+#define  TX_BUF_SIZE       MAX_ETH_FRAME_SIZE
+#define  TX_BUF_TOT_LEN    (TX_BUF_SIZE * NUM_TX_DESC)
+
+/* The following settings are log_2(bytes)-4:  0 == 16 bytes .. 6==1024, 7==end of packet. */
+#define  RX_FIFO_THRESH    7     /* Rx buffer level before first PCI xfer.  */
+
+/* Time in jiffies before concluding the transmitter is hung. */
+#define  TX_TIMEOUT     (4*HZ)
+
+#define  SILAN_STATS_NUM    2    /* number of ETHTOOL_GSTATS */
+
+/* media options */
+#define  AUTOSELECT    0x00
+#define  M10_HALF      0x01
+#define  M10_FULL      0x02
+#define  M100_HALF     0x04
+#define  M100_FULL     0x08
+
+ /* Symbolic offsets to registers. */
+enum  silan_registers {
+   Config0    = 0x00,         // Config0
+   Config1    = 0x04,         // Config1
+   RxBufWPtr  = 0x08,         // Rx buffer writer poiter
+   IntrStatus = 0x0C,         // Interrupt status
+   IntrMask   = 0x10,         // Interrupt mask
+   RxbufAddr  = 0x14,         // Rx buffer start address
+   RxBufRPtr  = 0x18,         // Rx buffer read pointer
+   Txstatusall = 0x1C,        // Transmit status of all descriptors
+   TxStatus0  = 0x20,	      // Transmit status (Four 32bit registers).
+   TxAddr0    = 0x30,         // Tx descriptors (also four 32bit).
+   RxConfig   = 0x40,         // Rx configuration
+   MAC0	      = 0x44,	      // Ethernet hardware address.
+   MAR0	      = 0x4C,	      // Multicast filter.
+   RxStatus0  = 0x54,         // Rx status
+   TxConfig   = 0x5C,         // Tx configuration
+   PhyCtrl    = 0x60,         // physical control
+   FlowCtrlConfig = 0x64,     // flow control
+   Miicmd0    = 0x68,         // Mii command0 register
+   Miicmd1    = 0x6C,         // Mii command1 register
+   Miistatus  = 0x70,         // Mii status register
+   Timercnt   = 0x74,         // Timer counter register
+   TimerIntr  = 0x78,         // Timer interrupt register
+   PMConfig   = 0x7C,         // Power Manager configuration
+   CRC0       = 0x80,         // Power Manager CRC ( Two 32bit regisers)
+   Wakeup0    = 0x88,         // power Manager wakeup( Eight 64bit regiser)
+   LSBCRC0    = 0xC8,         // power Manager LSBCRC(Two 32bit regiser)
+   TestD0     = 0xD0,
+   TestD4     = 0xD4,
+   TestD8     = 0xD8,
+};
+
+#define MII_BMCR            0        // Basic mode control register
+#define MII_BMSR            1        // Basic mode status register
+#define MII_JAB             16
+#define MII_OutputStatus    24
+
+#define BMCR_FULLDPLX       0x0100    // Full duplex
+#define BMCR_ANRESTART      0x0200    // Auto negotiation restart
+#define BMCR_ANENABLE       0x1000    // Enable auto negotiation
+#define BMCR_SPEED100       0x2000    // Select 100Mbps
+#define BMSR_LSTATUS        0x0004    // Link status
+#define PHY_16_JAB_ENB      0x1000
+#define PHY_16_PORT_ENB     0x1
+
+enum IntrStatusBits {
+   LinkFail       = 0x80000000,
+   LinkOK         = 0x40000000,
+   TimeOut        = 0x20000000,
+   RxOverflow     = 0x0040,
+   RxOK           = 0x0020,
+   TxOK           = 0x0001,
+   IntrBits = LinkFail|LinkOK|TimeOut|RxOverflow|RxOK|TxOK,
+};
+
+enum TxStatusBits {
+   TxCarrierLost = 0x20000000,
+   TxAborted     = 0x10000000,
+   TxOutOfWindow = 0x08000000,
+   TxNccShift    = 22,
+   EarlyTxThresShift = 16,
+   TxStatOK      = 0x8000,
+   TxUnderrun    = 0x4000,
+   TxOwn         = 0x2000,
+};
+
+enum RxStatusBits {
+   RxStatesOK   = 0x80000,
+   RxBadAlign   = 0x40000,
+   RxHugeFrame  = 0x20000,
+   RxSmallFrame = 0x10000,
+   RxCRCOK      = 0x8000,
+   RxCrlFrame   = 0x4000,
+   Rx_Broadcast = 0x2000,
+   Rx_Multicast = 0x1000,
+   RxAddrMatch  = 0x0800,
+   MiiErr       = 0x0400,
+};
+
+enum RxConfigBits {
+   RxFullDx    = 0x80000000,
+   RxEnb       = 0x40000000,
+   RxSmall     = 0x20000000,
+   RxHuge      = 0x10000000,
+   RxErr       = 0x08000000,
+   RxAllphys   = 0x04000000,
+   RxMulticast = 0x02000000,
+   RxBroadcast = 0x01000000,
+   RxLoopBack  = (1 << 23) | (1 << 22),
+   LowThresholdShift  = 12,
+   HighThresholdShift = 2,
+};
+
+enum TxConfigBits {
+   TxFullDx       = 0x80000000,
+   TxEnb          = 0x40000000,
+   TxEnbPad       = 0x20000000,
+   TxEnbHuge      = 0x10000000,
+   TxEnbFCS       = 0x08000000,
+   TxNoBackOff    = 0x04000000,
+   TxEnbPrem      = 0x02000000,
+   TxCareLostCrs  = 0x1000000,
+   TxExdCollNum   = 0xf00000,
+   TxDataRate     = 0x80000,
+};
+
+enum PhyCtrlconfigbits {
+   PhyCtrlAne         = 0x80000000,
+   PhyCtrlSpd100      = 0x40000000,
+   PhyCtrlSpd10       = 0x20000000,
+   PhyCtrlPhyBaseAddr = 0x1f000000,
+   PhyCtrlDux         = 0x800000,
+   PhyCtrlReset       = 0x400000,
+};
+
+enum FlowCtrlConfigBits {
+   FlowCtrlFullDX = 0x80000000,
+   FlowCtrlEnb    = 0x40000000,
+};
+
+enum Config0Bits {
+   Cfg0_Reset  = 0x80000000,
+   Cfg0_Anaoff = 0x40000000,
+   Cfg0_LDPS   = 0x20000000,
+};
+
+enum Config1Bits {
+   Cfg1_EarlyRx = 1 << 31,
+   Cfg1_EarlyTx = 1 << 30,
+
+   //rx buffer size
+   Cfg1_Rcv8K   = 0x0,
+   Cfg1_Rcv16K  = 0x1,
+   Cfg1_Rcv32K  = 0x3,
+   Cfg1_Rcv64K  = 0x7,
+   Cfg1_Rcv128K = 0xf,
+};
+
+enum MiiCmd0Bits {
+   Mii_Divider = 0x20000000,
+   Mii_WRITE   = 0x400000,
+   Mii_READ    = 0x200000,
+   Mii_SCAN    = 0x100000,
+   Mii_Tamod   = 0x80000,
+   Mii_Drvmod  = 0x40000,
+   Mii_mdc     = 0x20000,
+   Mii_mdoen   = 0x10000,
+   Mii_mdo     = 0x8000,
+   Mii_mdi     = 0x4000,
+};
+
+enum MiiStatusBits {
+    Mii_StatusBusy = 0x80000000,
+};
+
+enum PMConfigBits {
+   PM_Enable  = 1 << 31,
+   PM_LongWF  = 1 << 30,
+   PM_Magic   = 1 << 29,
+   PM_LANWake = 1 << 28,
+   PM_LWPTN   = (1 << 27 | 1<< 26),
+   PM_LinkUp  = 1 << 25,
+   PM_WakeUp  = 1 << 24,
+};
+
+/* Locking rules:
+ * priv->lock protects most of the fields of priv and most of the
+ * hardware registers. It does not have to protect against softirqs
+ * between sc92031_disable_interrupts and sc92031_enable_interrupts;
+ * it also does not need to be used in ->open and ->stop while the
+ * device interrupts are off.
+ * Not having to protect against softirqs is very useful due to heavy
+ * use of mdelay() at _sc92031_reset.
+ * Functions prefixed with _sc92031_ must be called with the lock held;
+ * functions prefixed with sc92031_ must be called without the lock held.
+ * Use mmiowb() before unlocking if the hardware was written to.
+ */
+
+/* Locking rules for the interrupt:
+ * - the interrupt and the tasklet never run at the same time
+ * - neither run between sc92031_disable_interrupts and
+ *   sc92031_enable_interrupt
+ */
+
+struct sc92031_priv {
+	spinlock_t		lock;
+	/* iomap.h cookie */
+	void __iomem		*port_base;
+	/* pci device structure */
+	struct pci_dev		*pdev;
+	/* tasklet */
+	struct tasklet_struct	tasklet;
+
+	/* CPU address of rx ring */
+	void			*rx_ring;
+	/* PCI address of rx ring */
+	dma_addr_t		rx_ring_dma_addr;
+	/* PCI address of rx ring read pointer */
+	dma_addr_t		rx_ring_tail;
+
+	/* tx ring write index */
+	unsigned		tx_head;
+	/* tx ring read index */
+	unsigned		tx_tail;
+	/* CPU address of tx bounce buffer */
+	void			*tx_bufs;
+	/* PCI address of tx bounce buffer */
+	dma_addr_t		tx_bufs_dma_addr;
+
+	/* copies of some hardware registers */
+	u32			intr_status;
+	atomic_t		intr_mask;
+	u32			rx_config;
+	u32			tx_config;
+	u32			pm_config;
+
+	/* copy of some flags from dev->flags */
+	unsigned int		mc_flags;
+
+	/* for ETHTOOL_GSTATS */
+	u64			tx_timeouts;
+	u64			rx_loss;
+
+	/* for dev->get_stats */
+	long			rx_value;
+	struct net_device_stats	stats;
+};
+
+/* I don't know which registers can be safely read; however, I can guess
+ * MAC0 is one of them. */
+static inline void _sc92031_dummy_read(void __iomem *port_base)
+{
+	ioread32(port_base + MAC0);
+}
+
+static u32 _sc92031_mii_wait(void __iomem *port_base)
+{
+	u32 mii_status;
+
+	do {
+		udelay(10);
+		mii_status = ioread32(port_base + Miistatus);
+	} while (mii_status & Mii_StatusBusy);
+
+	return mii_status;
+}
+
+static u32 _sc92031_mii_cmd(void __iomem *port_base, u32 cmd0, u32 cmd1)
+{
+	iowrite32(Mii_Divider, port_base + Miicmd0);
+
+	_sc92031_mii_wait(port_base);
+
+	iowrite32(cmd1, port_base + Miicmd1);
+	iowrite32(Mii_Divider | cmd0, port_base + Miicmd0);
+
+	return _sc92031_mii_wait(port_base);
+}
+
+static void _sc92031_mii_scan(void __iomem *port_base)
+{
+	_sc92031_mii_cmd(port_base, Mii_SCAN, 0x1 << 6);
+}
+
+static u16 _sc92031_mii_read(void __iomem *port_base, unsigned reg)
+{
+	return _sc92031_mii_cmd(port_base, Mii_READ, reg << 6) >> 13;
+}
+
+static void _sc92031_mii_write(void __iomem *port_base, unsigned reg, u16 val)
+{
+	_sc92031_mii_cmd(port_base, Mii_WRITE, (reg << 6) | ((u32)val << 11));
+}
+
+static void sc92031_disable_interrupts(struct net_device *dev)
+{
+	struct sc92031_priv *priv = netdev_priv(dev);
+	void __iomem *port_base = priv->port_base;
+
+	/* tell the tasklet/interrupt not to enable interrupts */
+	atomic_set(&priv->intr_mask, 0);
+	wmb();
+
+	/* stop interrupts */
+	iowrite32(0, port_base + IntrMask);
+	_sc92031_dummy_read(port_base);
+	mmiowb();
+
+	/* wait for any concurrent interrupt/tasklet to finish */
+	synchronize_irq(dev->irq);
+	tasklet_disable(&priv->tasklet);
+}
+
+static void sc92031_enable_interrupts(struct net_device *dev)
+{
+	struct sc92031_priv *priv = netdev_priv(dev);
+	void __iomem *port_base = priv->port_base;
+
+	tasklet_enable(&priv->tasklet);
+
+	atomic_set(&priv->intr_mask, IntrBits);
+	wmb();
+
+	iowrite32(IntrBits, port_base + IntrMask);
+	mmiowb();
+}
+
+static void _sc92031_disable_tx_rx(struct net_device *dev)
+{
+	struct sc92031_priv *priv = netdev_priv(dev);
+	void __iomem *port_base = priv->port_base;
+
+	priv->rx_config &= ~RxEnb;
+	priv->tx_config &= ~TxEnb;
+	iowrite32(priv->rx_config, port_base + RxConfig);
+	iowrite32(priv->tx_config, port_base + TxConfig);
+}
+
+static void _sc92031_enable_tx_rx(struct net_device *dev)
+{
+	struct sc92031_priv *priv = netdev_priv(dev);
+	void __iomem *port_base = priv->port_base;
+
+	priv->rx_config |= RxEnb;
+	priv->tx_config |= TxEnb;
+	iowrite32(priv->rx_config, port_base + RxConfig);
+	iowrite32(priv->tx_config, port_base + TxConfig);
+}
+
+static void _sc92031_tx_clear(struct net_device *dev)
+{
+	struct sc92031_priv *priv = netdev_priv(dev);
+
+	while (priv->tx_head - priv->tx_tail > 0) {
+		priv->tx_tail++;
+		priv->stats.tx_dropped++;
+	}
+	priv->tx_head = priv->tx_tail = 0;
+}
+
+static void _sc92031_set_mar(struct net_device *dev)
+{
+	struct sc92031_priv *priv = netdev_priv(dev);
+	void __iomem *port_base = priv->port_base;
+	u32 mar0 = 0, mar1 = 0;
+
+	if ((dev->flags & IFF_PROMISC)
+			|| dev->mc_count > multicast_filter_limit
+			|| (dev->flags & IFF_ALLMULTI))
+		mar0 = mar1 = 0xffffffff;
+	else if (dev->flags & IFF_MULTICAST) {
+		struct dev_mc_list *mc_list;
+
+		for (mc_list = dev->mc_list; mc_list; mc_list = mc_list->next) {
+			u32 crc;
+			unsigned bit = 0;
+
+			crc = ~ether_crc(ETH_ALEN, mc_list->dmi_addr);
+			crc >>= 24;
+
+			if (crc & 0x01)	bit |= 0x02;
+			if (crc & 0x02)	bit |= 0x01;
+			if (crc & 0x10)	bit |= 0x20;
+			if (crc & 0x20)	bit |= 0x10;
+			if (crc & 0x40)	bit |= 0x08;
+			if (crc & 0x80)	bit |= 0x04;
+
+			if (bit > 31)
+				mar0 |= 0x1 << (bit - 32);
+			else
+				mar1 |= 0x1 << bit;
+		}
+	}
+
+	iowrite32(mar0, port_base + MAR0);
+	iowrite32(mar1, port_base + MAR0 + 4);
+}
+
+static void _sc92031_set_rx_config(struct net_device *dev)
+{
+	struct sc92031_priv *priv = netdev_priv(dev);
+	void __iomem *port_base = priv->port_base;
+	unsigned int old_mc_flags;
+	u32 rx_config_bits = 0;
+
+	old_mc_flags = priv->mc_flags;
+
+	if (dev->flags & IFF_PROMISC)
+		rx_config_bits |= RxSmall | RxHuge | RxErr | RxBroadcast
+				| RxMulticast | RxAllphys;
+
+	if (dev->flags & (IFF_ALLMULTI | IFF_MULTICAST))
+		rx_config_bits |= RxMulticast;
+
+	if (dev->flags & IFF_BROADCAST)
+		rx_config_bits |= RxBroadcast;
+
+	priv->rx_config &= ~(RxSmall | RxHuge | RxErr | RxBroadcast
+			| RxMulticast | RxAllphys);
+	priv->rx_config |= rx_config_bits;
+
+	priv->mc_flags = dev->flags & (IFF_PROMISC | IFF_ALLMULTI
+			| IFF_MULTICAST | IFF_BROADCAST);
+
+	if (netif_carrier_ok(dev) && priv->mc_flags != old_mc_flags)
+		iowrite32(priv->rx_config, port_base + RxConfig);
+}
+
+static bool _sc92031_check_media(struct net_device *dev)
+{
+	struct sc92031_priv *priv = netdev_priv(dev);
+	void __iomem *port_base = priv->port_base;
+	u16 bmsr;
+
+	bmsr = _sc92031_mii_read(port_base, MII_BMSR);
+	rmb();
+	if (bmsr & BMSR_LSTATUS) {
+		bool speed_100, duplex_full;
+		u32 flow_ctrl_config = 0;
+		u16 output_status = _sc92031_mii_read(port_base,
+				MII_OutputStatus);
+		_sc92031_mii_scan(port_base);
+
+		speed_100 = output_status & 0x2;
+		duplex_full = output_status & 0x4;
+
+		/* Initial Tx/Rx configuration */
+		priv->rx_config = (0x40 << LowThresholdShift) | (0x1c0 << HighThresholdShift);
+		priv->tx_config = 0x48800000;
+
+		/* NOTE: vendor driver had dead code here to enable tx padding */
+
+		if (!speed_100)
+			priv->tx_config |= 0x80000;
+
+		// configure rx mode
+		_sc92031_set_rx_config(dev);
+
+		if (duplex_full) {
+			priv->rx_config |= RxFullDx;
+			priv->tx_config |= TxFullDx;
+			flow_ctrl_config = FlowCtrlFullDX | FlowCtrlEnb;
+		} else {
+			priv->rx_config &= ~RxFullDx;
+			priv->tx_config &= ~TxFullDx;
+		}
+
+		_sc92031_set_mar(dev);
+		_sc92031_set_rx_config(dev);
+		_sc92031_enable_tx_rx(dev);
+		iowrite32(flow_ctrl_config, port_base + FlowCtrlConfig);
+
+		netif_carrier_on(dev);
+
+		if (printk_ratelimit())
+			printk(KERN_INFO "%s: link up, %sMbps, %s-duplex\n",
+				dev->name,
+				speed_100 ? "100" : "10",
+				duplex_full ? "full" : "half");
+		return true;
+	} else {
+		_sc92031_mii_scan(port_base);
+
+		netif_carrier_off(dev);
+
+		_sc92031_disable_tx_rx(dev);
+
+		if (printk_ratelimit())
+			printk(KERN_INFO "%s: link down\n", dev->name);
+		return false;
+	}
+}
+
+static void _sc92031_phy_reset(struct net_device *dev)
+{
+	struct sc92031_priv *priv = netdev_priv(dev);
+	void __iomem *port_base = priv->port_base;
+	u32 phy_ctrl;
+
+	phy_ctrl = ioread32(port_base + PhyCtrl);
+	phy_ctrl &= ~(PhyCtrlDux | PhyCtrlSpd100 | PhyCtrlSpd10);
+	phy_ctrl |= PhyCtrlAne | PhyCtrlReset;
+
+	switch (media) {
+	default:
+	case AUTOSELECT:
+		phy_ctrl |= PhyCtrlDux | PhyCtrlSpd100 | PhyCtrlSpd10;
+		break;
+	case M10_HALF:
+		phy_ctrl |= PhyCtrlSpd10;
+		break;
+	case M10_FULL:
+		phy_ctrl |= PhyCtrlDux | PhyCtrlSpd10;
+		break;
+	case M100_HALF:
+		phy_ctrl |= PhyCtrlSpd100;
+		break;
+	case M100_FULL:
+		phy_ctrl |= PhyCtrlDux | PhyCtrlSpd100;
+		break;
+	}
+
+	iowrite32(phy_ctrl, port_base + PhyCtrl);
+	mdelay(10);
+
+	phy_ctrl &= ~PhyCtrlReset;
+	iowrite32(phy_ctrl, port_base + PhyCtrl);
+	mdelay(1);
+
+	_sc92031_mii_write(port_base, MII_JAB,
+			PHY_16_JAB_ENB | PHY_16_PORT_ENB);
+	_sc92031_mii_scan(port_base);
+
+	netif_carrier_off(dev);
+	netif_stop_queue(dev);
+}
+
+static void _sc92031_reset(struct net_device *dev)
+{
+	struct sc92031_priv *priv = netdev_priv(dev);
+	void __iomem *port_base = priv->port_base;
+
+	/* disable PM */
+	iowrite32(0, port_base + PMConfig);
+
+	/* soft reset the chip */
+	iowrite32(Cfg0_Reset, port_base + Config0);
+	mdelay(200);
+
+	iowrite32(0, port_base + Config0);
+	mdelay(10);
+
+	/* disable interrupts */
+	iowrite32(0, port_base + IntrMask);
+
+	/* clear multicast address */
+	iowrite32(0, port_base + MAR0);
+	iowrite32(0, port_base + MAR0 + 4);
+
+	/* init rx ring */
+	iowrite32(priv->rx_ring_dma_addr, port_base + RxbufAddr);
+	priv->rx_ring_tail = priv->rx_ring_dma_addr;
+
+	/* init tx ring */
+	_sc92031_tx_clear(dev);
+
+	/* clear old register values */
+	priv->intr_status = 0;
+	atomic_set(&priv->intr_mask, 0);
+	priv->rx_config = 0;
+	priv->tx_config = 0;
+	priv->mc_flags = 0;
+
+	/* configure rx buffer size */
+	/* NOTE: vendor driver had dead code here to enable early tx/rx */
+	iowrite32(Cfg1_Rcv64K, port_base + Config1);
+
+	_sc92031_phy_reset(dev);
+	_sc92031_check_media(dev);
+
+	/* calculate rx fifo overflow */
+	priv->rx_value = 0;
+
+	/* enable PM */
+	iowrite32(priv->pm_config, port_base + PMConfig);
+
+	/* clear intr register */
+	ioread32(port_base + IntrStatus);
+}
+
+static void _sc92031_tx_tasklet(struct net_device *dev)
+{
+	struct sc92031_priv *priv = netdev_priv(dev);
+	void __iomem *port_base = priv->port_base;
+
+	unsigned old_tx_tail;
+	unsigned entry;
+	u32 tx_status;
+
+	old_tx_tail = priv->tx_tail;
+	while (priv->tx_head - priv->tx_tail > 0) {
+		entry = priv->tx_tail % NUM_TX_DESC;
+		tx_status = ioread32(port_base + TxStatus0 + entry * 4);
+
+		if (!(tx_status & (TxStatOK | TxUnderrun | TxAborted)))
+			break;
+
+		priv->tx_tail++;
+
+		if (tx_status & TxStatOK) {
+			priv->stats.tx_bytes += tx_status & 0x1fff;
+			priv->stats.tx_packets++;
+			/* Note: TxCarrierLost is always asserted at 100mbps. */
+			priv->stats.collisions += (tx_status >> 22) & 0xf;
+		}
+
+		if (tx_status & (TxOutOfWindow | TxAborted)) {
+			priv->stats.tx_errors++;
+
+			if (tx_status & TxAborted)
+				priv->stats.tx_aborted_errors++;
+
+			if (tx_status & TxCarrierLost)
+				priv->stats.tx_carrier_errors++;
+
+			if (tx_status & TxOutOfWindow)
+				priv->stats.tx_window_errors++;
+		}
+
+		if (tx_status & TxUnderrun)
+			priv->stats.tx_fifo_errors++;
+	}
+
+	if (priv->tx_tail != old_tx_tail)
+		if (netif_queue_stopped(dev))
+			netif_wake_queue(dev);
+}
+
+static void _sc92031_rx_tasklet_error(u32 rx_status,
+		struct sc92031_priv *priv, unsigned rx_size)
+{
+	if(rx_size > (MAX_ETH_FRAME_SIZE + 4) || rx_size < 16) {
+		priv->stats.rx_errors++;
+		priv->stats.rx_length_errors++;
+	}
+
+	if (!(rx_status & RxStatesOK)) {
+		priv->stats.rx_errors++;
+
+		if (rx_status & (RxHugeFrame | RxSmallFrame))
+			priv->stats.rx_length_errors++;
+
+		if (rx_status & RxBadAlign)
+			priv->stats.rx_frame_errors++;
+
+		if (!(rx_status & RxCRCOK))
+			priv->stats.rx_crc_errors++;
+	} else
+		priv->rx_loss++;
+}
+
+static void _sc92031_rx_tasklet(struct net_device *dev)
+{
+	struct sc92031_priv *priv = netdev_priv(dev);
+	void __iomem *port_base = priv->port_base;
+
+	dma_addr_t rx_ring_head;
+	unsigned rx_len;
+	unsigned rx_ring_offset;
+	void *rx_ring = priv->rx_ring;
+
+	rx_ring_head = ioread32(port_base + RxBufWPtr);
+	rmb();
+
+	/* rx_ring_head is only 17 bits in the RxBufWPtr register.
+	 * we need to change it to 32 bits physical address
+	 */
+	rx_ring_head &= (dma_addr_t)(RX_BUF_LEN - 1);
+	rx_ring_head |= priv->rx_ring_dma_addr & ~(dma_addr_t)(RX_BUF_LEN - 1);
+	if (rx_ring_head < priv->rx_ring_dma_addr)
+		rx_ring_head += RX_BUF_LEN;
+
+	if (rx_ring_head >= priv->rx_ring_tail)
+		rx_len = rx_ring_head - priv->rx_ring_tail;
+	else
+		rx_len = RX_BUF_LEN - (priv->rx_ring_tail - rx_ring_head);
+
+	if (!rx_len)
+		return;
+
+	if (unlikely(rx_len > RX_BUF_LEN)) {
+		if (printk_ratelimit())
+			printk(KERN_ERR "%s: rx packets length > rx buffer\n",
+					dev->name);
+		return;
+	}
+
+	rx_ring_offset = (priv->rx_ring_tail - priv->rx_ring_dma_addr) % RX_BUF_LEN;
+
+	while (rx_len) {
+		u32 rx_status;
+		unsigned rx_size, rx_size_align, pkt_size;
+		struct sk_buff *skb;
+
+		rx_status = le32_to_cpup((__le32 *)(rx_ring + rx_ring_offset));
+		rmb();
+
+		rx_size = rx_status >> 20;
+		rx_size_align = (rx_size + 3) & ~3;	// for 4 bytes aligned
+		pkt_size = rx_size - 4;	// Omit the four octet CRC from the length.
+
+		rx_ring_offset = (rx_ring_offset + 4) % RX_BUF_LEN;
+
+		if (unlikely(rx_status == 0
+				|| rx_size > (MAX_ETH_FRAME_SIZE + 4)
+				|| rx_size < 16
+				|| !(rx_status & RxStatesOK))) {
+			_sc92031_rx_tasklet_error(rx_status, priv, rx_size);
+			break;
+		}
+
+		if (unlikely(rx_size_align + 4 > rx_len)) {
+			if (printk_ratelimit())
+				printk(KERN_ERR "%s: rx_len is too small\n", dev->name);
+			break;
+		}
+
+		rx_len -= rx_size_align + 4;
+
+		skb = dev_alloc_skb(pkt_size + NET_IP_ALIGN);
+		if (unlikely(!skb)) {
+			if (printk_ratelimit())
+				printk(KERN_ERR "%s: Couldn't allocate a skb_buff for a packet of size %u\n",
+						dev->name, pkt_size);
+			goto next;
+		}
+
+		skb_reserve(skb, NET_IP_ALIGN);
+
+		if ((rx_ring_offset + pkt_size) > RX_BUF_LEN) {
+			memcpy(skb_put(skb, RX_BUF_LEN - rx_ring_offset),
+				rx_ring + rx_ring_offset, RX_BUF_LEN - rx_ring_offset);
+			memcpy(skb_put(skb, pkt_size - (RX_BUF_LEN - rx_ring_offset)),
+				rx_ring, pkt_size - (RX_BUF_LEN - rx_ring_offset));
+		} else {
+			memcpy(skb_put(skb, pkt_size), rx_ring + rx_ring_offset, pkt_size);
+		}
+
+		skb->dev = dev;
+		skb->protocol = eth_type_trans(skb, dev);
+		dev->last_rx = jiffies;
+		netif_rx(skb);
+
+		priv->stats.rx_bytes += pkt_size;
+		priv->stats.rx_packets++;
+
+		if (rx_status & Rx_Multicast)
+			priv->stats.multicast++;
+
+	next:
+		rx_ring_offset = (rx_ring_offset + rx_size_align) % RX_BUF_LEN;
+	}
+	mb();
+
+	priv->rx_ring_tail = rx_ring_head;
+	iowrite32(priv->rx_ring_tail, port_base + RxBufRPtr);
+}
+
+static void _sc92031_link_tasklet(struct net_device *dev)
+{
+	struct sc92031_priv *priv = netdev_priv(dev);
+
+	if (_sc92031_check_media(dev))
+		netif_wake_queue(dev);
+	else {
+		netif_stop_queue(dev);
+		priv->stats.tx_carrier_errors++;
+	}
+}
+
+static void sc92031_tasklet(unsigned long data)
+{
+	struct net_device *dev = (struct net_device *)data;
+	struct sc92031_priv *priv = netdev_priv(dev);
+	void __iomem *port_base = priv->port_base;
+	u32 intr_status, intr_mask;
+
+	intr_status = priv->intr_status;
+
+	spin_lock(&priv->lock);
+
+	if (unlikely(!netif_running(dev)))
+		goto out;
+
+	if (intr_status & TxOK)
+		_sc92031_tx_tasklet(dev);
+
+	if (intr_status & RxOK)
+		_sc92031_rx_tasklet(dev);
+
+	if (intr_status & RxOverflow)
+		priv->stats.rx_errors++;
+
+	if (intr_status & TimeOut) {
+		priv->stats.rx_errors++;
+		priv->stats.rx_length_errors++;
+	}
+
+	if (intr_status & (LinkFail | LinkOK))
+		_sc92031_link_tasklet(dev);
+
+out:
+	intr_mask = atomic_read(&priv->intr_mask);
+	rmb();
+
+	iowrite32(intr_mask, port_base + IntrMask);
+	mmiowb();
+
+	spin_unlock(&priv->lock);
+}
+
+static irqreturn_t sc92031_interrupt(int irq, void *dev_id)
+{
+	struct net_device *dev = dev_id;
+	struct sc92031_priv *priv = netdev_priv(dev);
+	void __iomem *port_base = priv->port_base;
+	u32 intr_status, intr_mask;
+
+	/* mask interrupts before clearing IntrStatus */
+	iowrite32(0, port_base + IntrMask);
+	_sc92031_dummy_read(port_base);
+
+	intr_status = ioread32(port_base + IntrStatus);
+	if (unlikely(intr_status == 0xffffffff))
+		return IRQ_NONE;	// hardware has gone missing
+
+	intr_status &= IntrBits;
+	if (!intr_status)
+		goto out_none;
+
+	priv->intr_status = intr_status;
+	tasklet_schedule(&priv->tasklet);
+
+	return IRQ_HANDLED;
+
+out_none:
+	intr_mask = atomic_read(&priv->intr_mask);
+	rmb();
+
+	iowrite32(intr_mask, port_base + IntrMask);
+	mmiowb();
+
+	return IRQ_NONE;
+}
+
+static struct net_device_stats *sc92031_get_stats(struct net_device *dev)
+{
+	struct sc92031_priv *priv = netdev_priv(dev);
+	void __iomem *port_base = priv->port_base;
+
+	// FIXME I do not understand what is this trying to do.
+	if (netif_running(dev)) {
+		int temp;
+
+		spin_lock_bh(&priv->lock);
+
+		/* Update the error count. */
+		temp = (ioread32(port_base + RxStatus0) >> 16) & 0xffff;
+
+		if (temp == 0xffff) {
+			priv->rx_value += temp;
+			priv->stats.rx_fifo_errors = priv->rx_value;
+		} else {
+			priv->stats.rx_fifo_errors = temp + priv->rx_value;
+		}
+
+		spin_unlock_bh(&priv->lock);
+	}
+
+	return &priv->stats;
+}
+
+static int sc92031_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	int err = 0;
+	struct sc92031_priv *priv = netdev_priv(dev);
+	void __iomem *port_base = priv->port_base;
+
+	unsigned len;
+	unsigned entry;
+	u32 tx_status;
+
+	if (unlikely(skb->len > TX_BUF_SIZE)) {
+		err = -EMSGSIZE;
+		priv->stats.tx_dropped++;
+		goto out;
+	}
+
+	spin_lock_bh(&priv->lock);
+
+	if (unlikely(!netif_carrier_ok(dev))) {
+		err = -ENOLINK;
+		priv->stats.tx_dropped++;
+		goto out_unlock;
+	}
+
+	BUG_ON(priv->tx_head - priv->tx_tail >= NUM_TX_DESC);
+
+	entry = priv->tx_head++ % NUM_TX_DESC;
+
+	skb_copy_and_csum_dev(skb, priv->tx_bufs + entry * TX_BUF_SIZE);
+
+	len = skb->len;
+	if (unlikely(len < ETH_ZLEN)) {
+		memset(priv->tx_bufs + entry * TX_BUF_SIZE + len,
+				0, ETH_ZLEN - len);
+		len = ETH_ZLEN;
+	}
+
+	wmb();
+
+	if (len < 100)
+		tx_status = len;
+	else if (len < 300)
+		tx_status = 0x30000 | len;
+	else
+		tx_status = 0x50000 | len;
+
+	iowrite32(priv->tx_bufs_dma_addr + entry * TX_BUF_SIZE,
+			port_base + TxAddr0 + entry * 4);
+	iowrite32(tx_status, port_base + TxStatus0 + entry * 4);
+	mmiowb();
+
+	dev->trans_start = jiffies;
+
+	if (priv->tx_head - priv->tx_tail >= NUM_TX_DESC)
+		netif_stop_queue(dev);
+
+out_unlock:
+	spin_unlock_bh(&priv->lock);
+
+out:
+	dev_kfree_skb(skb);
+
+	return err;
+}
+
+static int sc92031_open(struct net_device *dev)
+{
+	int err;
+	struct sc92031_priv *priv = netdev_priv(dev);
+	struct pci_dev *pdev = priv->pdev;
+
+	priv->rx_ring = pci_alloc_consistent(pdev, RX_BUF_LEN,
+			&priv->rx_ring_dma_addr);
+	if (unlikely(!priv->rx_ring)) {
+		err = -ENOMEM;
+		goto out_alloc_rx_ring;
+	}
+
+	priv->tx_bufs = pci_alloc_consistent(pdev, TX_BUF_TOT_LEN,
+			&priv->tx_bufs_dma_addr);
+	if (unlikely(!priv->tx_bufs)) {
+		err = -ENOMEM;
+		goto out_alloc_tx_bufs;
+	}
+	priv->tx_head = priv->tx_tail = 0;
+
+	err = request_irq(pdev->irq, sc92031_interrupt,
+			SA_SHIRQ, dev->name, dev);
+	if (unlikely(err < 0))
+		goto out_request_irq;
+
+	priv->pm_config = 0;
+
+	/* Interrupts already disabled by sc92031_stop or sc92031_probe */
+	spin_lock(&priv->lock);
+
+	_sc92031_reset(dev);
+	mmiowb();
+
+	spin_unlock(&priv->lock);
+	sc92031_enable_interrupts(dev);
+
+	if (netif_carrier_ok(dev))
+		netif_start_queue(dev);
+	else
+		netif_tx_disable(dev);
+
+	return 0;
+
+out_request_irq:
+	pci_free_consistent(pdev, TX_BUF_TOT_LEN, priv->tx_bufs,
+			priv->tx_bufs_dma_addr);
+out_alloc_tx_bufs:
+	pci_free_consistent(pdev, RX_BUF_LEN, priv->rx_ring,
+			priv->rx_ring_dma_addr);
+out_alloc_rx_ring:
+	return err;
+}
+
+static int sc92031_stop(struct net_device *dev)
+{
+	struct sc92031_priv *priv = netdev_priv(dev);
+	struct pci_dev *pdev = priv->pdev;
+
+	netif_tx_disable(dev);
+
+	/* Disable interrupts, stop Tx and Rx. */
+	sc92031_disable_interrupts(dev);
+
+	spin_lock(&priv->lock);
+
+	_sc92031_disable_tx_rx(dev);
+	_sc92031_tx_clear(dev);
+	mmiowb();
+
+	spin_unlock(&priv->lock);
+
+	free_irq(pdev->irq, dev);
+	pci_free_consistent(pdev, TX_BUF_TOT_LEN, priv->tx_bufs,
+			priv->tx_bufs_dma_addr);
+	pci_free_consistent(pdev, RX_BUF_LEN, priv->rx_ring,
+			priv->rx_ring_dma_addr);
+
+	return 0;
+}
+
+static void sc92031_set_multicast_list(struct net_device *dev)
+{
+	struct sc92031_priv *priv = netdev_priv(dev);
+
+	spin_lock_bh(&priv->lock);
+
+	_sc92031_set_mar(dev);
+	_sc92031_set_rx_config(dev);
+	mmiowb();
+
+	spin_unlock_bh(&priv->lock);
+}
+
+static void sc92031_tx_timeout(struct net_device *dev)
+{
+	struct sc92031_priv *priv = netdev_priv(dev);
+
+	/* Disable interrupts by clearing the interrupt mask.*/
+	sc92031_disable_interrupts(dev);
+
+	spin_lock(&priv->lock);
+
+	priv->tx_timeouts++;
+
+	_sc92031_reset(dev);
+	mmiowb();
+
+	spin_unlock(&priv->lock);
+
+	/* enable interrupts */
+	sc92031_enable_interrupts(dev);
+
+	if (netif_carrier_ok(dev))
+		netif_wake_queue(dev);
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void sc92031_poll_controller(struct net_device *dev)
+{
+	disable_irq(dev->irq);
+	if (sc92031_interrupt(dev->irq, dev) != IRQ_NONE)
+		sc92031_tasklet((unsigned long)dev);
+	enable_irq(dev->irq);
+}
+#endif
+
+static int sc92031_ethtool_get_settings(struct net_device *dev,
+		struct ethtool_cmd *cmd)
+{
+	struct sc92031_priv *priv = netdev_priv(dev);
+	void __iomem *port_base = priv->port_base;
+	u8 phy_address;
+	u32 phy_ctrl;
+	u16 output_status;
+
+	spin_lock_bh(&priv->lock);
+
+	phy_address = ioread32(port_base + Miicmd1) >> 27;
+	phy_ctrl = ioread32(port_base + PhyCtrl);
+
+	output_status = _sc92031_mii_read(port_base, MII_OutputStatus);
+	_sc92031_mii_scan(port_base);
+	mmiowb();
+
+	spin_unlock_bh(&priv->lock);
+
+	cmd->supported = SUPPORTED_10baseT_Half | SUPPORTED_10baseT_Full
+			| SUPPORTED_100baseT_Half | SUPPORTED_100baseT_Full
+			| SUPPORTED_Autoneg | SUPPORTED_TP | SUPPORTED_MII;
+
+	cmd->advertising = ADVERTISED_TP | ADVERTISED_MII;
+
+	if ((phy_ctrl & (PhyCtrlDux | PhyCtrlSpd100 | PhyCtrlSpd10))
+			== (PhyCtrlDux | PhyCtrlSpd100 | PhyCtrlSpd10))
+		cmd->advertising |= ADVERTISED_Autoneg;
+
+	if ((phy_ctrl & PhyCtrlSpd10) == PhyCtrlSpd10)
+		cmd->advertising |= ADVERTISED_10baseT_Half;
+
+	if ((phy_ctrl & (PhyCtrlSpd10 | PhyCtrlDux))
+			== (PhyCtrlSpd10 | PhyCtrlDux))
+		cmd->advertising |= ADVERTISED_10baseT_Full;
+
+	if ((phy_ctrl & PhyCtrlSpd100) == PhyCtrlSpd100)
+		cmd->advertising |= ADVERTISED_100baseT_Half;
+
+	if ((phy_ctrl & (PhyCtrlSpd100 | PhyCtrlDux))
+			== (PhyCtrlSpd100 | PhyCtrlDux))
+		cmd->advertising |= ADVERTISED_100baseT_Full;
+
+	if (phy_ctrl & PhyCtrlAne)
+		cmd->advertising |= ADVERTISED_Autoneg;
+
+	cmd->speed = (output_status & 0x2) ? SPEED_100 : SPEED_10;
+	cmd->duplex = (output_status & 0x4) ? DUPLEX_FULL : DUPLEX_HALF;
+	cmd->port = PORT_MII;
+	cmd->phy_address = phy_address;
+	cmd->transceiver = XCVR_INTERNAL;
+	cmd->autoneg = (phy_ctrl & PhyCtrlAne) ? AUTONEG_ENABLE : AUTONEG_DISABLE;
+
+	return 0;
+}
+
+static int sc92031_ethtool_set_settings(struct net_device *dev,
+		struct ethtool_cmd *cmd)
+{
+	struct sc92031_priv *priv = netdev_priv(dev);
+	void __iomem *port_base = priv->port_base;
+	u32 phy_ctrl;
+	u32 old_phy_ctrl;
+
+	if (!(cmd->speed == SPEED_10 || cmd->speed == SPEED_100))
+		return -EINVAL;
+	if (!(cmd->duplex == DUPLEX_HALF || cmd->duplex == DUPLEX_FULL))
+		return -EINVAL;
+	if (!(cmd->port == PORT_MII))
+		return -EINVAL;
+	if (!(cmd->phy_address == 0x1f))
+		return -EINVAL;
+	if (!(cmd->transceiver == XCVR_INTERNAL))
+		return -EINVAL;
+	if (!(cmd->autoneg == AUTONEG_DISABLE || cmd->autoneg == AUTONEG_ENABLE))
+		return -EINVAL;
+
+	if (cmd->autoneg == AUTONEG_ENABLE) {
+		if (!(cmd->advertising & (ADVERTISED_Autoneg
+				| ADVERTISED_100baseT_Full
+				| ADVERTISED_100baseT_Half
+				| ADVERTISED_10baseT_Full
+				| ADVERTISED_10baseT_Half)))
+			return -EINVAL;
+
+		phy_ctrl = PhyCtrlAne;
+
+		// FIXME: I'm not sure what the original code was trying to do
+		if (cmd->advertising & ADVERTISED_Autoneg)
+			phy_ctrl |= PhyCtrlDux | PhyCtrlSpd100 | PhyCtrlSpd10;
+		if (cmd->advertising & ADVERTISED_100baseT_Full)
+			phy_ctrl |= PhyCtrlDux | PhyCtrlSpd100;
+		if (cmd->advertising & ADVERTISED_100baseT_Half)
+			phy_ctrl |= PhyCtrlSpd100;
+		if (cmd->advertising & ADVERTISED_10baseT_Full)
+			phy_ctrl |= PhyCtrlSpd10 | PhyCtrlDux;
+		if (cmd->advertising & ADVERTISED_10baseT_Half)
+			phy_ctrl |= PhyCtrlSpd10;
+	} else {
+		// FIXME: Whole branch guessed
+		phy_ctrl = 0;
+
+		if (cmd->speed == SPEED_10)
+			phy_ctrl |= PhyCtrlSpd10;
+		else /* cmd->speed == SPEED_100 */
+			phy_ctrl |= PhyCtrlSpd100;
+
+		if (cmd->duplex == DUPLEX_FULL)
+			phy_ctrl |= PhyCtrlDux;
+	}
+
+	spin_lock_bh(&priv->lock);
+
+	old_phy_ctrl = ioread32(port_base + PhyCtrl);
+	phy_ctrl |= old_phy_ctrl & ~(PhyCtrlAne | PhyCtrlDux
+			| PhyCtrlSpd100 | PhyCtrlSpd10);
+	if (phy_ctrl != old_phy_ctrl)
+		iowrite32(phy_ctrl, port_base + PhyCtrl);
+
+	spin_unlock_bh(&priv->lock);
+
+	return 0;
+}
+
+static void sc92031_ethtool_get_drvinfo(struct net_device *dev,
+		struct ethtool_drvinfo *drvinfo)
+{
+	struct sc92031_priv *priv = netdev_priv(dev);
+	struct pci_dev *pdev = priv->pdev;
+
+	strcpy(drvinfo->driver, SC92031_NAME);
+	strcpy(drvinfo->version, SC92031_VERSION);
+	strcpy(drvinfo->bus_info, pci_name(pdev));
+}
+
+static void sc92031_ethtool_get_wol(struct net_device *dev,
+		struct ethtool_wolinfo *wolinfo)
+{
+	struct sc92031_priv *priv = netdev_priv(dev);
+	void __iomem *port_base = priv->port_base;
+	u32 pm_config;
+
+	spin_lock_bh(&priv->lock);
+	pm_config = ioread32(port_base + PMConfig);
+	spin_unlock_bh(&priv->lock);
+
+	// FIXME: Guessed
+	wolinfo->supported = WAKE_PHY | WAKE_MAGIC
+			| WAKE_UCAST | WAKE_MCAST | WAKE_BCAST;
+	wolinfo->wolopts = 0;
+
+	if (pm_config & PM_LinkUp)
+		wolinfo->wolopts |= WAKE_PHY;
+
+	if (pm_config & PM_Magic)
+		wolinfo->wolopts |= WAKE_MAGIC;
+
+	if (pm_config & PM_WakeUp)
+		// FIXME: Guessed
+		wolinfo->wolopts |= WAKE_UCAST | WAKE_MCAST | WAKE_BCAST;
+}
+
+static int sc92031_ethtool_set_wol(struct net_device *dev,
+		struct ethtool_wolinfo *wolinfo)
+{
+	struct sc92031_priv *priv = netdev_priv(dev);
+	void __iomem *port_base = priv->port_base;
+	u32 pm_config;
+
+	spin_lock_bh(&priv->lock);
+
+	pm_config = ioread32(port_base + PMConfig)
+			& ~(PM_LinkUp | PM_Magic | PM_WakeUp);
+
+	if (wolinfo->wolopts & WAKE_PHY)
+		pm_config |= PM_LinkUp;
+
+	if (wolinfo->wolopts & WAKE_MAGIC)
+		pm_config |= PM_Magic;
+
+	// FIXME: Guessed
+	if (wolinfo->wolopts & (WAKE_UCAST | WAKE_MCAST | WAKE_BCAST))
+		pm_config |= PM_WakeUp;
+
+	priv->pm_config = pm_config;
+	iowrite32(pm_config, port_base + PMConfig);
+	mmiowb();
+
+	spin_unlock_bh(&priv->lock);
+
+	return 0;
+}
+
+static int sc92031_ethtool_nway_reset(struct net_device *dev)
+{
+	int err = 0;
+	struct sc92031_priv *priv = netdev_priv(dev);
+	void __iomem *port_base = priv->port_base;
+	u16 bmcr;
+
+	spin_lock_bh(&priv->lock);
+
+	bmcr = _sc92031_mii_read(port_base, MII_BMCR);
+	if (!(bmcr & BMCR_ANENABLE)) {
+		err = -EINVAL;
+		goto out;
+	}
+
+	_sc92031_mii_write(port_base, MII_BMCR, bmcr | BMCR_ANRESTART);
+
+out:
+	_sc92031_mii_scan(port_base);
+	mmiowb();
+
+	spin_unlock_bh(&priv->lock);
+
+	return err;
+}
+
+static const char sc92031_ethtool_stats_strings[SILAN_STATS_NUM][ETH_GSTRING_LEN] = {
+	"tx_timeout",
+	"rx_loss",
+};
+
+static void sc92031_ethtool_get_strings(struct net_device *dev,
+		u32 stringset, u8 *data)
+{
+	if (stringset == ETH_SS_STATS)
+		memcpy(data, sc92031_ethtool_stats_strings,
+				SILAN_STATS_NUM * ETH_GSTRING_LEN);
+}
+
+static int sc92031_ethtool_get_stats_count(struct net_device *dev)
+{
+	return SILAN_STATS_NUM;
+}
+
+static void sc92031_ethtool_get_ethtool_stats(struct net_device *dev,
+		struct ethtool_stats *stats, u64 *data)
+{
+	struct sc92031_priv *priv = netdev_priv(dev);
+
+	spin_lock_bh(&priv->lock);
+	data[0] = priv->tx_timeouts;
+	data[1] = priv->rx_loss;
+	spin_unlock_bh(&priv->lock);
+}
+
+static struct ethtool_ops sc92031_ethtool_ops = {
+	.get_settings		= sc92031_ethtool_get_settings,
+	.set_settings		= sc92031_ethtool_set_settings,
+	.get_drvinfo		= sc92031_ethtool_get_drvinfo,
+	.get_wol		= sc92031_ethtool_get_wol,
+	.set_wol		= sc92031_ethtool_set_wol,
+	.nway_reset		= sc92031_ethtool_nway_reset,
+	.get_link		= ethtool_op_get_link,
+	.get_tx_csum		= ethtool_op_get_tx_csum,
+	.get_sg			= ethtool_op_get_sg,
+	.get_tso		= ethtool_op_get_tso,
+	.get_strings		= sc92031_ethtool_get_strings,
+	.get_stats_count	= sc92031_ethtool_get_stats_count,
+	.get_ethtool_stats	= sc92031_ethtool_get_ethtool_stats,
+	.get_perm_addr		= ethtool_op_get_perm_addr,
+	.get_ufo		= ethtool_op_get_ufo,
+};
+
+static int __devinit sc92031_probe(struct pci_dev *pdev,
+		const struct pci_device_id *id)
+{
+	int err;
+	void __iomem* port_base;
+	struct net_device *dev;
+	struct sc92031_priv *priv;
+	u32 mac0, mac1;
+
+	err = pci_enable_device(pdev);
+	if (unlikely(err < 0))
+		goto out_enable_device;
+
+	pci_set_master(pdev);
+
+	err = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
+	if (unlikely(err < 0))
+		goto out_set_dma_mask;
+
+	err = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
+	if (unlikely(err < 0))
+		goto out_set_dma_mask;
+
+	err = pci_request_regions(pdev, SC92031_NAME);
+	if (unlikely(err < 0))
+		goto out_request_regions;
+
+	port_base = pci_iomap(pdev, SC92031_USE_BAR, 0);
+	if (unlikely(!port_base)) {
+		err = -EIO;
+		goto out_iomap;
+	}
+
+	dev = alloc_etherdev(sizeof(struct sc92031_priv));
+	if (unlikely(!dev)) {
+		err = -ENOMEM;
+		goto out_alloc_etherdev;
+	}
+
+	pci_set_drvdata(pdev, dev);
+
+#if SC92031_USE_BAR == 0
+	dev->mem_start = pci_resource_start(pdev, SC92031_USE_BAR);
+	dev->mem_end = pci_resource_end(pdev, SC92031_USE_BAR);
+#elif SC92031_USE_BAR == 1
+	dev->base_addr = pci_resource_start(pdev, SC92031_USE_BAR);
+#endif
+	dev->irq = pdev->irq;
+
+	/* faked with skb_copy_and_csum_dev */
+	dev->features = NETIF_F_SG | NETIF_F_HW_CSUM | NETIF_F_HIGHDMA;
+
+	dev->get_stats		= sc92031_get_stats;
+	dev->ethtool_ops	= &sc92031_ethtool_ops;
+	dev->hard_start_xmit	= sc92031_start_xmit;
+	dev->watchdog_timeo	= TX_TIMEOUT;
+	dev->open		= sc92031_open;
+	dev->stop		= sc92031_stop;
+	dev->set_multicast_list	= sc92031_set_multicast_list;
+	dev->tx_timeout		= sc92031_tx_timeout;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	dev->poll_controller	= sc92031_poll_controller;
+#endif
+
+	priv = netdev_priv(dev);
+	spin_lock_init(&priv->lock);
+	priv->port_base = port_base;
+	priv->pdev = pdev;
+	tasklet_init(&priv->tasklet, sc92031_tasklet, (unsigned long)dev);
+	/* Fudge tasklet count so the call to sc92031_enable_interrupts at
+	 * sc92031_open will work correctly */
+	tasklet_disable_nosync(&priv->tasklet);
+
+	/* PCI PM Wakeup */
+	iowrite32((~PM_LongWF & ~PM_LWPTN) | PM_Enable, port_base + PMConfig);
+
+	mac0 = ioread32(port_base + MAC0);
+	mac1 = ioread32(port_base + MAC0 + 4);
+	dev->dev_addr[0] = dev->perm_addr[0] = mac0 >> 24;
+	dev->dev_addr[1] = dev->perm_addr[1] = mac0 >> 16;
+	dev->dev_addr[2] = dev->perm_addr[2] = mac0 >> 8;
+	dev->dev_addr[3] = dev->perm_addr[3] = mac0;
+	dev->dev_addr[4] = dev->perm_addr[4] = mac1 >> 8;
+	dev->dev_addr[5] = dev->perm_addr[5] = mac1;
+
+	err = register_netdev(dev);
+	if (err < 0)
+		goto out_register_netdev;
+
+	return 0;
+
+out_register_netdev:
+	free_netdev(dev);
+out_alloc_etherdev:
+	pci_iounmap(pdev, port_base);
+out_iomap:
+	pci_release_regions(pdev);
+out_request_regions:
+out_set_dma_mask:
+	pci_disable_device(pdev);
+out_enable_device:
+	return err;
+}
+
+static void __devexit sc92031_remove(struct pci_dev *pdev)
+{
+	struct net_device *dev = pci_get_drvdata(pdev);
+	struct sc92031_priv *priv = netdev_priv(dev);
+	void __iomem* port_base = priv->port_base;
+
+	unregister_netdev(dev);
+	free_netdev(dev);
+	pci_iounmap(pdev, port_base);
+	pci_release_regions(pdev);
+	pci_disable_device(pdev);
+}
+
+static int sc92031_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+	struct net_device *dev = pci_get_drvdata(pdev);
+	struct sc92031_priv *priv = netdev_priv(dev);
+
+	pci_save_state(pdev);
+
+	if (!netif_running(dev))
+		goto out;
+
+	netif_device_detach(dev);
+
+	/* Disable interrupts, stop Tx and Rx. */
+	sc92031_disable_interrupts(dev);
+
+	spin_lock(&priv->lock);
+
+	_sc92031_disable_tx_rx(dev);
+	_sc92031_tx_clear(dev);
+	mmiowb();
+
+	spin_unlock(&priv->lock);
+
+out:
+	pci_set_power_state(pdev, pci_choose_state(pdev, state));
+
+	return 0;
+}
+
+static int sc92031_resume(struct pci_dev *pdev)
+{
+	struct net_device *dev = pci_get_drvdata(pdev);
+	struct sc92031_priv *priv = netdev_priv(dev);
+
+	pci_restore_state(pdev);
+	pci_set_power_state(pdev, PCI_D0);
+
+	if (!netif_running(dev))
+		goto out;
+
+	/* Interrupts already disabled by sc92031_suspend */
+	spin_lock(&priv->lock);
+
+	_sc92031_reset(dev);
+	mmiowb();
+
+	spin_unlock(&priv->lock);
+	sc92031_enable_interrupts(dev);
+
+	netif_device_attach(dev);
+
+	if (netif_carrier_ok(dev))
+		netif_wake_queue(dev);
+	else
+		netif_tx_disable(dev);
+
+out:
+	return 0;
+}
+
+static struct pci_device_id sc92031_pci_device_id_table[] __devinitdata = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_SILAN, PCI_DEVICE_ID_SILAN_SC92031) },
+	{ PCI_DEVICE(PCI_VENDOR_ID_SILAN, PCI_DEVICE_ID_SILAN_8139D) },
+	{ 0, }
+};
+MODULE_DEVICE_TABLE(pci, sc92031_pci_device_id_table);
+
+static struct pci_driver sc92031_pci_driver = {
+	.name		= SC92031_NAME,
+	.id_table	= sc92031_pci_device_id_table,
+	.probe		= sc92031_probe,
+	.remove		= __devexit_p(sc92031_remove),
+	.suspend	= sc92031_suspend,
+	.resume		= sc92031_resume,
+};
+
+static int __init sc92031_init(void)
+{
+	printk(KERN_INFO SC92031_DESCRIPTION " " SC92031_VERSION "\n");
+	return pci_register_driver(&sc92031_pci_driver);
+}
+
+static void __exit sc92031_exit(void)
+{
+	pci_unregister_driver(&sc92031_pci_driver);
+}
+
+module_init(sc92031_init);
+module_exit(sc92031_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Cesar Eduardo Barros <cesarb@cesarb.net>");
+MODULE_DESCRIPTION(SC92031_DESCRIPTION);
+MODULE_VERSION(SC92031_VERSION);