[PATCH] Add tsi108/9 On Chip Ethernet device driver support

Add tsi108/9 on chip Ethernet controller driver support.

The driver code collects the feedback of previous posting form the mailing
list and gives the update.

MPC7448HPC2 platform in arch/powerpc uses tsi108 bridge.

The following is a brief description of the Ethernet controller:

The Tsi108/9 Ethernet Controller connects Switch Fabric to two independent
Gigabit Ethernet ports,E0 and E1.  It uses a single Management interface to
manage the two physical connection devices (PHYs).  Each Ethernet port has
its own statistics monitor that tracks and reports key interface
statistics.  Each port supports a 256-entry hash table for address
filtering.  In addition, each port is bridged to the Switch Fabric through
a 2-Kbyte transmit FIFO and a 4-Kbyte Receive FIFO.

Each Ethernet port also has a pair of internal Ethernet DMA channels to
support the transmit and receive data flows.  The Ethernet DMA channels use
descriptors set up in memory, the memory map of the device, and access via
the Switch Fabric.  The Ethernet Controller’s DMA arbiter handles
arbitration for the Switch Fabric.  The Controller also has a register bus
interface for register accesses and status monitor control.

The PMD (Physical Media Device) interface operates in MII, GMII, or TBI
modes.  The MII mode is used for connecting with 10 or 100 Mbit/s PMDs.
The GMII and TBI modes are used to connect with Gigabit PMDs.  Internal
data flows to and from the Ethernet Controller through the Switch Fabric.
Each

Ethernet port uses its transmit and receive DMA channels to manage data
flows through buffer descriptors that are predefined by the system (the
descriptors can exist anywhere in the system memory map).  These
descriptors are data structures that point to buffers filled with data
ready to transmit over Ethernet, or they point to empty buffers ready to
receive data from Ethernet.

Signed-off-by: Alexandre Bounine <Alexandre.Bounine@tundra.com>
Signed-off-by: Roy Zang	<tie-fei.zang@freescale.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

4 files changed, 2082 insertions, 0 deletions

diff --git a/drivers/net/Kconfig b/drivers/net/Kconfig
index 112d4cd5c66..05167253b25 100644
--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -2251,6 +2251,14 @@ config SPIDER_NET
 	  This driver supports the Gigabit Ethernet chips present on the
 	  Cell Processor-Based Blades from IBM.
 
+config TSI108_ETH
+	   tristate "Tundra TSI108 gigabit Ethernet support"
+	   depends on TSI108_BRIDGE
+	   help
+	     This driver supports Tundra TSI108 gigabit Ethernet ports.
+	     To compile this driver as a module, choose M here: the module
+	     will be called tsi108_eth.
+
 config GIANFAR
 	tristate "Gianfar Ethernet"
 	depends on 85xx || 83xx || PPC_86xx
diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index 7889e4ca184..789306ca793 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -108,6 +108,7 @@ obj-$(CONFIG_B44) += b44.o
 obj-$(CONFIG_FORCEDETH) += forcedeth.o
 obj-$(CONFIG_NE_H8300) += ne-h8300.o
 
+obj-$(CONFIG_TSI108_ETH) += tsi108_eth.o
 obj-$(CONFIG_MV643XX_ETH) += mv643xx_eth.o
 obj-$(CONFIG_QLA3XXX) += qla3xxx.o
 
diff --git a/drivers/net/tsi108_eth.c b/drivers/net/tsi108_eth.c
new file mode 100644
index 00000000000..893808ab374
--- /dev/null
+++ b/drivers/net/tsi108_eth.c
@@ -0,0 +1,1708 @@
+/*******************************************************************************
+
+  Copyright(c) 2006 Tundra Semiconductor Corporation.
+
+  This program is free software; you can redistribute it and/or modify it
+  under the terms of the GNU General Public License as published by the Free
+  Software Foundation; either version 2 of the License, or (at your option)
+  any later version.
+
+  This program is distributed in the hope that it will be useful, but WITHOUT
+  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+  more details.
+
+  You should have received a copy of the GNU General Public License along with
+  this program; if not, write to the Free Software Foundation, Inc., 59
+  Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+
+*******************************************************************************/
+
+/* This driver is based on the driver code originally developed
+ * for the Intel IOC80314 (ForestLake) Gigabit Ethernet by
+ * scott.wood@timesys.com  * Copyright (C) 2003 TimeSys Corporation
+ *
+ * Currently changes from original version are:
+ * - porting to Tsi108-based platform and kernel 2.6 (kong.lai@tundra.com)
+ * - modifications to handle two ports independently and support for
+ *   additional PHY devices (alexandre.bounine@tundra.com)
+ * - Get hardware information from platform device. (tie-fei.zang@freescale.com)
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/net.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <linux/sched.h>
+#include <linux/spinlock.h>
+#include <linux/delay.h>
+#include <linux/crc32.h>
+#include <linux/mii.h>
+#include <linux/device.h>
+#include <linux/pci.h>
+#include <linux/rtnetlink.h>
+#include <linux/timer.h>
+#include <linux/platform_device.h>
+#include <linux/etherdevice.h>
+
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/tsi108.h>
+
+#include "tsi108_eth.h"
+
+#define MII_READ_DELAY 10000	/* max link wait time in msec */
+
+#define TSI108_RXRING_LEN     256
+
+/* NOTE: The driver currently does not support receiving packets
+ * larger than the buffer size, so don't decrease this (unless you
+ * want to add such support).
+ */
+#define TSI108_RXBUF_SIZE     1536
+
+#define TSI108_TXRING_LEN     256
+
+#define TSI108_TX_INT_FREQ    64
+
+/* Check the phy status every half a second. */
+#define CHECK_PHY_INTERVAL (HZ/2)
+
+static int tsi108_init_one(struct platform_device *pdev);
+static int tsi108_ether_remove(struct platform_device *pdev);
+
+struct tsi108_prv_data {
+	void  __iomem *regs;	/* Base of normal regs */
+	void  __iomem *phyregs;	/* Base of register bank used for PHY access */
+
+	unsigned int phy;		/* Index of PHY for this interface */
+	unsigned int irq_num;
+	unsigned int id;
+
+	struct timer_list timer;/* Timer that triggers the check phy function */
+	unsigned int rxtail;	/* Next entry in rxring to read */
+	unsigned int rxhead;	/* Next entry in rxring to give a new buffer */
+	unsigned int rxfree;	/* Number of free, allocated RX buffers */
+
+	unsigned int rxpending;	/* Non-zero if there are still descriptors
+				 * to be processed from a previous descriptor
+				 * interrupt condition that has been cleared */
+
+	unsigned int txtail;	/* Next TX descriptor to check status on */
+	unsigned int txhead;	/* Next TX descriptor to use */
+
+	/* Number of free TX descriptors.  This could be calculated from
+	 * rxhead and rxtail if one descriptor were left unused to disambiguate
+	 * full and empty conditions, but it's simpler to just keep track
+	 * explicitly. */
+
+	unsigned int txfree;
+
+	unsigned int phy_ok;		/* The PHY is currently powered on. */
+
+	/* PHY status (duplex is 1 for half, 2 for full,
+	 * so that the default 0 indicates that neither has
+	 * yet been configured). */
+
+	unsigned int link_up;
+	unsigned int speed;
+	unsigned int duplex;
+
+	tx_desc *txring;
+	rx_desc *rxring;
+	struct sk_buff *txskbs[TSI108_TXRING_LEN];
+	struct sk_buff *rxskbs[TSI108_RXRING_LEN];
+
+	dma_addr_t txdma, rxdma;
+
+	/* txlock nests in misclock and phy_lock */
+
+	spinlock_t txlock, misclock;
+
+	/* stats is used to hold the upper bits of each hardware counter,
+	 * and tmpstats is used to hold the full values for returning
+	 * to the caller of get_stats().  They must be separate in case
+	 * an overflow interrupt occurs before the stats are consumed.
+	 */
+
+	struct net_device_stats stats;
+	struct net_device_stats tmpstats;
+
+	/* These stats are kept separate in hardware, thus require individual
+	 * fields for handling carry.  They are combined in get_stats.
+	 */
+
+	unsigned long rx_fcs;	/* Add to rx_frame_errors */
+	unsigned long rx_short_fcs;	/* Add to rx_frame_errors */
+	unsigned long rx_long_fcs;	/* Add to rx_frame_errors */
+	unsigned long rx_underruns;	/* Add to rx_length_errors */
+	unsigned long rx_overruns;	/* Add to rx_length_errors */
+
+	unsigned long tx_coll_abort;	/* Add to tx_aborted_errors/collisions */
+	unsigned long tx_pause_drop;	/* Add to tx_aborted_errors */
+
+	unsigned long mc_hash[16];
+	u32 msg_enable;			/* debug message level */
+	struct mii_if_info mii_if;
+	unsigned int init_media;
+};
+
+/* Structure for a device driver */
+
+static struct platform_driver tsi_eth_driver = {
+	.probe = tsi108_init_one,
+	.remove = tsi108_ether_remove,
+	.driver	= {
+		.name = "tsi-ethernet",
+	},
+};
+
+static void tsi108_timed_checker(unsigned long dev_ptr);
+
+static void dump_eth_one(struct net_device *dev)
+{
+	struct tsi108_prv_data *data = netdev_priv(dev);
+
+	printk("Dumping %s...\n", dev->name);
+	printk("intstat %x intmask %x phy_ok %d"
+	       " link %d speed %d duplex %d\n",
+	       TSI_READ(TSI108_EC_INTSTAT),
+	       TSI_READ(TSI108_EC_INTMASK), data->phy_ok,
+	       data->link_up, data->speed, data->duplex);
+
+	printk("TX: head %d, tail %d, free %d, stat %x, estat %x, err %x\n",
+	       data->txhead, data->txtail, data->txfree,
+	       TSI_READ(TSI108_EC_TXSTAT),
+	       TSI_READ(TSI108_EC_TXESTAT),
+	       TSI_READ(TSI108_EC_TXERR));
+
+	printk("RX: head %d, tail %d, free %d, stat %x,"
+	       " estat %x, err %x, pending %d\n\n",
+	       data->rxhead, data->rxtail, data->rxfree,
+	       TSI_READ(TSI108_EC_RXSTAT),
+	       TSI_READ(TSI108_EC_RXESTAT),
+	       TSI_READ(TSI108_EC_RXERR), data->rxpending);
+}
+
+/* Synchronization is needed between the thread and up/down events.
+ * Note that the PHY is accessed through the same registers for both
+ * interfaces, so this can't be made interface-specific.
+ */
+
+static DEFINE_SPINLOCK(phy_lock);
+
+static int tsi108_read_mii(struct tsi108_prv_data *data, int reg)
+{
+	unsigned i;
+
+	TSI_WRITE_PHY(TSI108_MAC_MII_ADDR,
+				(data->phy << TSI108_MAC_MII_ADDR_PHY) |
+				(reg << TSI108_MAC_MII_ADDR_REG));
+	TSI_WRITE_PHY(TSI108_MAC_MII_CMD, 0);
+	TSI_WRITE_PHY(TSI108_MAC_MII_CMD, TSI108_MAC_MII_CMD_READ);
+	for (i = 0; i < 100; i++) {
+		if (!(TSI_READ_PHY(TSI108_MAC_MII_IND) &
+		      (TSI108_MAC_MII_IND_NOTVALID | TSI108_MAC_MII_IND_BUSY)))
+			break;
+		udelay(10);
+	}
+
+	if (i == 100)
+		return 0xffff;
+	else
+		return (TSI_READ_PHY(TSI108_MAC_MII_DATAIN));
+}
+
+static void tsi108_write_mii(struct tsi108_prv_data *data,
+				int reg, u16 val)
+{
+	unsigned i = 100;
+	TSI_WRITE_PHY(TSI108_MAC_MII_ADDR,
+				(data->phy << TSI108_MAC_MII_ADDR_PHY) |
+				(reg << TSI108_MAC_MII_ADDR_REG));
+	TSI_WRITE_PHY(TSI108_MAC_MII_DATAOUT, val);
+	while (i--) {
+		if(!(TSI_READ_PHY(TSI108_MAC_MII_IND) &
+			TSI108_MAC_MII_IND_BUSY))
+			break;
+		udelay(10);
+	}
+}
+
+static int tsi108_mdio_read(struct net_device *dev, int addr, int reg)
+{
+	struct tsi108_prv_data *data = netdev_priv(dev);
+	return tsi108_read_mii(data, reg);
+}
+
+static void tsi108_mdio_write(struct net_device *dev, int addr, int reg, int val)
+{
+	struct tsi108_prv_data *data = netdev_priv(dev);
+	tsi108_write_mii(data, reg, val);
+}
+
+static inline void tsi108_write_tbi(struct tsi108_prv_data *data,
+					int reg, u16 val)
+{
+	unsigned i = 1000;
+	TSI_WRITE(TSI108_MAC_MII_ADDR,
+			     (0x1e << TSI108_MAC_MII_ADDR_PHY)
+			     | (reg << TSI108_MAC_MII_ADDR_REG));
+	TSI_WRITE(TSI108_MAC_MII_DATAOUT, val);
+	while(i--) {
+		if(!(TSI_READ(TSI108_MAC_MII_IND) & TSI108_MAC_MII_IND_BUSY))
+			return;
+		udelay(10);
+	}
+	printk(KERN_ERR "%s function time out \n", __FUNCTION__);
+}
+
+static int mii_speed(struct mii_if_info *mii)
+{
+	int advert, lpa, val, media;
+	int lpa2 = 0;
+	int speed;
+
+	if (!mii_link_ok(mii))
+		return 0;
+
+	val = (*mii->mdio_read) (mii->dev, mii->phy_id, MII_BMSR);
+	if ((val & BMSR_ANEGCOMPLETE) == 0)
+		return 0;
+
+	advert = (*mii->mdio_read) (mii->dev, mii->phy_id, MII_ADVERTISE);
+	lpa = (*mii->mdio_read) (mii->dev, mii->phy_id, MII_LPA);
+	media = mii_nway_result(advert & lpa);
+
+	if (mii->supports_gmii)
+		lpa2 = mii->mdio_read(mii->dev, mii->phy_id, MII_STAT1000);
+
+	speed = lpa2 & (LPA_1000FULL | LPA_1000HALF) ? 1000 :
+			(media & (ADVERTISE_100FULL | ADVERTISE_100HALF) ? 100 : 10);
+	return speed;
+}
+
+static void tsi108_check_phy(struct net_device *dev)
+{
+	struct tsi108_prv_data *data = netdev_priv(dev);
+	u32 mac_cfg2_reg, portctrl_reg;
+	u32 duplex;
+	u32 speed;
+	unsigned long flags;
+
+	/* Do a dummy read, as for some reason the first read
+	 * after a link becomes up returns link down, even if
+	 * it's been a while since the link came up.
+	 */
+
+	spin_lock_irqsave(&phy_lock, flags);
+
+	if (!data->phy_ok)
+		goto out;
+
+	tsi108_read_mii(data, MII_BMSR);
+
+	duplex = mii_check_media(&data->mii_if, netif_msg_link(data), data->init_media);
+	data->init_media = 0;
+
+	if (netif_carrier_ok(dev)) {
+
+		speed = mii_speed(&data->mii_if);
+
+		if ((speed != data->speed) || duplex) {
+
+			mac_cfg2_reg = TSI_READ(TSI108_MAC_CFG2);
+			portctrl_reg = TSI_READ(TSI108_EC_PORTCTRL);
+
+			mac_cfg2_reg &= ~TSI108_MAC_CFG2_IFACE_MASK;
+
+			if (speed == 1000) {
+				mac_cfg2_reg |= TSI108_MAC_CFG2_GIG;
+				portctrl_reg &= ~TSI108_EC_PORTCTRL_NOGIG;
+			} else {
+				mac_cfg2_reg |= TSI108_MAC_CFG2_NOGIG;
+				portctrl_reg |= TSI108_EC_PORTCTRL_NOGIG;
+			}
+
+			data->speed = speed;
+
+			if (data->mii_if.full_duplex) {
+				mac_cfg2_reg |= TSI108_MAC_CFG2_FULLDUPLEX;
+				portctrl_reg &= ~TSI108_EC_PORTCTRL_HALFDUPLEX;
+				data->duplex = 2;
+			} else {
+				mac_cfg2_reg &= ~TSI108_MAC_CFG2_FULLDUPLEX;
+				portctrl_reg |= TSI108_EC_PORTCTRL_HALFDUPLEX;
+				data->duplex = 1;
+			}
+
+			TSI_WRITE(TSI108_MAC_CFG2, mac_cfg2_reg);
+			TSI_WRITE(TSI108_EC_PORTCTRL, portctrl_reg);
+
+			if (data->link_up == 0) {
+				/* The manual says it can take 3-4 usecs for the speed change
+				 * to take effect.
+				 */
+				udelay(5);
+
+				spin_lock(&data->txlock);
+				if (is_valid_ether_addr(dev->dev_addr) && data->txfree)
+					netif_wake_queue(dev);
+
+				data->link_up = 1;
+				spin_unlock(&data->txlock);
+			}
+		}
+
+	} else {
+		if (data->link_up == 1) {
+			netif_stop_queue(dev);
+			data->link_up = 0;
+			printk(KERN_NOTICE "%s : link is down\n", dev->name);
+		}
+
+		goto out;
+	}
+
+
+out:
+	spin_unlock_irqrestore(&phy_lock, flags);
+}
+
+static inline void
+tsi108_stat_carry_one(int carry, int carry_bit, int carry_shift,
+		      unsigned long *upper)
+{
+	if (carry & carry_bit)
+		*upper += carry_shift;
+}
+
+static void tsi108_stat_carry(struct net_device *dev)
+{
+	struct tsi108_prv_data *data = netdev_priv(dev);
+	u32 carry1, carry2;
+
+	spin_lock_irq(&data->misclock);
+
+	carry1 = TSI_READ(TSI108_STAT_CARRY1);
+	carry2 = TSI_READ(TSI108_STAT_CARRY2);
+
+	TSI_WRITE(TSI108_STAT_CARRY1, carry1);
+	TSI_WRITE(TSI108_STAT_CARRY2, carry2);
+
+	tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXBYTES,
+			      TSI108_STAT_RXBYTES_CARRY, &data->stats.rx_bytes);
+
+	tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXPKTS,
+			      TSI108_STAT_RXPKTS_CARRY,
+			      &data->stats.rx_packets);
+
+	tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXFCS,
+			      TSI108_STAT_RXFCS_CARRY, &data->rx_fcs);
+
+	tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXMCAST,
+			      TSI108_STAT_RXMCAST_CARRY,
+			      &data->stats.multicast);
+
+	tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXALIGN,
+			      TSI108_STAT_RXALIGN_CARRY,
+			      &data->stats.rx_frame_errors);
+
+	tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXLENGTH,
+			      TSI108_STAT_RXLENGTH_CARRY,
+			      &data->stats.rx_length_errors);
+
+	tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXRUNT,
+			      TSI108_STAT_RXRUNT_CARRY, &data->rx_underruns);
+
+	tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXJUMBO,
+			      TSI108_STAT_RXJUMBO_CARRY, &data->rx_overruns);
+
+	tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXFRAG,
+			      TSI108_STAT_RXFRAG_CARRY, &data->rx_short_fcs);
+
+	tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXJABBER,
+			      TSI108_STAT_RXJABBER_CARRY, &data->rx_long_fcs);
+
+	tsi108_stat_carry_one(carry1, TSI108_STAT_CARRY1_RXDROP,
+			      TSI108_STAT_RXDROP_CARRY,
+			      &data->stats.rx_missed_errors);
+
+	tsi108_stat_carry_one(carry2, TSI108_STAT_CARRY2_TXBYTES,
+			      TSI108_STAT_TXBYTES_CARRY, &data->stats.tx_bytes);
+
+	tsi108_stat_carry_one(carry2, TSI108_STAT_CARRY2_TXPKTS,
+			      TSI108_STAT_TXPKTS_CARRY,
+			      &data->stats.tx_packets);
+
+	tsi108_stat_carry_one(carry2, TSI108_STAT_CARRY2_TXEXDEF,
+			      TSI108_STAT_TXEXDEF_CARRY,
+			      &data->stats.tx_aborted_errors);
+
+	tsi108_stat_carry_one(carry2, TSI108_STAT_CARRY2_TXEXCOL,
+			      TSI108_STAT_TXEXCOL_CARRY, &data->tx_coll_abort);
+
+	tsi108_stat_carry_one(carry2, TSI108_STAT_CARRY2_TXTCOL,
+			      TSI108_STAT_TXTCOL_CARRY,
+			      &data->stats.collisions);
+
+	tsi108_stat_carry_one(carry2, TSI108_STAT_CARRY2_TXPAUSE,
+			      TSI108_STAT_TXPAUSEDROP_CARRY,
+			      &data->tx_pause_drop);
+
+	spin_unlock_irq(&data->misclock);
+}
+
+/* Read a stat counter atomically with respect to carries.
+ * data->misclock must be held.
+ */
+static inline unsigned long
+tsi108_read_stat(struct tsi108_prv_data * data, int reg, int carry_bit,
+		 int carry_shift, unsigned long *upper)
+{
+	int carryreg;
+	unsigned long val;
+
+	if (reg < 0xb0)
+		carryreg = TSI108_STAT_CARRY1;
+	else
+		carryreg = TSI108_STAT_CARRY2;
+
+      again:
+	val = TSI_READ(reg) | *upper;
+
+	/* Check to see if it overflowed, but the interrupt hasn't
+	 * been serviced yet.  If so, handle the carry here, and
+	 * try again.
+	 */
+
+	if (unlikely(TSI_READ(carryreg) & carry_bit)) {
+		*upper += carry_shift;
+		TSI_WRITE(carryreg, carry_bit);
+		goto again;
+	}
+
+	return val;
+}
+
+static struct net_device_stats *tsi108_get_stats(struct net_device *dev)
+{
+	unsigned long excol;
+
+	struct tsi108_prv_data *data = netdev_priv(dev);
+	spin_lock_irq(&data->misclock);
+
+	data->tmpstats.rx_packets =
+	    tsi108_read_stat(data, TSI108_STAT_RXPKTS,
+			     TSI108_STAT_CARRY1_RXPKTS,
+			     TSI108_STAT_RXPKTS_CARRY, &data->stats.rx_packets);
+
+	data->tmpstats.tx_packets =
+	    tsi108_read_stat(data, TSI108_STAT_TXPKTS,
+			     TSI108_STAT_CARRY2_TXPKTS,
+			     TSI108_STAT_TXPKTS_CARRY, &data->stats.tx_packets);
+
+	data->tmpstats.rx_bytes =
+	    tsi108_read_stat(data, TSI108_STAT_RXBYTES,
+			     TSI108_STAT_CARRY1_RXBYTES,
+			     TSI108_STAT_RXBYTES_CARRY, &data->stats.rx_bytes);
+
+	data->tmpstats.tx_bytes =
+	    tsi108_read_stat(data, TSI108_STAT_TXBYTES,
+			     TSI108_STAT_CARRY2_TXBYTES,
+			     TSI108_STAT_TXBYTES_CARRY, &data->stats.tx_bytes);
+
+	data->tmpstats.multicast =
+	    tsi108_read_stat(data, TSI108_STAT_RXMCAST,
+			     TSI108_STAT_CARRY1_RXMCAST,
+			     TSI108_STAT_RXMCAST_CARRY, &data->stats.multicast);
+
+	excol = tsi108_read_stat(data, TSI108_STAT_TXEXCOL,
+				 TSI108_STAT_CARRY2_TXEXCOL,
+				 TSI108_STAT_TXEXCOL_CARRY,
+				 &data->tx_coll_abort);
+
+	data->tmpstats.collisions =
+	    tsi108_read_stat(data, TSI108_STAT_TXTCOL,
+			     TSI108_STAT_CARRY2_TXTCOL,
+			     TSI108_STAT_TXTCOL_CARRY, &data->stats.collisions);
+
+	data->tmpstats.collisions += excol;
+
+	data->tmpstats.rx_length_errors =
+	    tsi108_read_stat(data, TSI108_STAT_RXLENGTH,
+			     TSI108_STAT_CARRY1_RXLENGTH,
+			     TSI108_STAT_RXLENGTH_CARRY,
+			     &data->stats.rx_length_errors);
+
+	data->tmpstats.rx_length_errors +=
+	    tsi108_read_stat(data, TSI108_STAT_RXRUNT,
+			     TSI108_STAT_CARRY1_RXRUNT,
+			     TSI108_STAT_RXRUNT_CARRY, &data->rx_underruns);
+
+	data->tmpstats.rx_length_errors +=
+	    tsi108_read_stat(data, TSI108_STAT_RXJUMBO,
+			     TSI108_STAT_CARRY1_RXJUMBO,
+			     TSI108_STAT_RXJUMBO_CARRY, &data->rx_overruns);
+
+	data->tmpstats.rx_frame_errors =
+	    tsi108_read_stat(data, TSI108_STAT_RXALIGN,
+			     TSI108_STAT_CARRY1_RXALIGN,
+			     TSI108_STAT_RXALIGN_CARRY,
+			     &data->stats.rx_frame_errors);
+
+	data->tmpstats.rx_frame_errors +=
+	    tsi108_read_stat(data, TSI108_STAT_RXFCS,
+			     TSI108_STAT_CARRY1_RXFCS, TSI108_STAT_RXFCS_CARRY,
+			     &data->rx_fcs);
+
+	data->tmpstats.rx_frame_errors +=
+	    tsi108_read_stat(data, TSI108_STAT_RXFRAG,
+			     TSI108_STAT_CARRY1_RXFRAG,
+			     TSI108_STAT_RXFRAG_CARRY, &data->rx_short_fcs);
+
+	data->tmpstats.rx_missed_errors =
+	    tsi108_read_stat(data, TSI108_STAT_RXDROP,
+			     TSI108_STAT_CARRY1_RXDROP,
+			     TSI108_STAT_RXDROP_CARRY,
+			     &data->stats.rx_missed_errors);
+
+	/* These three are maintained by software. */
+	data->tmpstats.rx_fifo_errors = data->stats.rx_fifo_errors;
+	data->tmpstats.rx_crc_errors = data->stats.rx_crc_errors;
+
+	data->tmpstats.tx_aborted_errors =
+	    tsi108_read_stat(data, TSI108_STAT_TXEXDEF,
+			     TSI108_STAT_CARRY2_TXEXDEF,
+			     TSI108_STAT_TXEXDEF_CARRY,
+			     &data->stats.tx_aborted_errors);
+
+	data->tmpstats.tx_aborted_errors +=
+	    tsi108_read_stat(data, TSI108_STAT_TXPAUSEDROP,
+			     TSI108_STAT_CARRY2_TXPAUSE,
+			     TSI108_STAT_TXPAUSEDROP_CARRY,
+			     &data->tx_pause_drop);
+
+	data->tmpstats.tx_aborted_errors += excol;
+
+	data->tmpstats.tx_errors = data->tmpstats.tx_aborted_errors;
+	data->tmpstats.rx_errors = data->tmpstats.rx_length_errors +
+	    data->tmpstats.rx_crc_errors +
+	    data->tmpstats.rx_frame_errors +
+	    data->tmpstats.rx_fifo_errors + data->tmpstats.rx_missed_errors;
+
+	spin_unlock_irq(&data->misclock);
+	return &data->tmpstats;
+}
+
+static void tsi108_restart_rx(struct tsi108_prv_data * data, struct net_device *dev)
+{
+	TSI_WRITE(TSI108_EC_RXQ_PTRHIGH,
+			     TSI108_EC_RXQ_PTRHIGH_VALID);
+
+	TSI_WRITE(TSI108_EC_RXCTRL, TSI108_EC_RXCTRL_GO
+			     | TSI108_EC_RXCTRL_QUEUE0);
+}
+
+static void tsi108_restart_tx(struct tsi108_prv_data * data)
+{
+	TSI_WRITE(TSI108_EC_TXQ_PTRHIGH,
+			     TSI108_EC_TXQ_PTRHIGH_VALID);
+
+	TSI_WRITE(TSI108_EC_TXCTRL, TSI108_EC_TXCTRL_IDLEINT |
+			     TSI108_EC_TXCTRL_GO | TSI108_EC_TXCTRL_QUEUE0);
+}
+
+/* txlock must be held by caller, with IRQs disabled, and
+ * with permission to re-enable them when the lock is dropped.
+ */
+static void tsi108_complete_tx(struct net_device *dev)
+{
+	struct tsi108_prv_data *data = netdev_priv(dev);
+	int tx;
+	struct sk_buff *skb;
+	int release = 0;
+
+	while (!data->txfree || data->txhead != data->txtail) {
+		tx = data->txtail;
+
+		if (data->txring[tx].misc & TSI108_TX_OWN)
+			break;
+
+		skb = data->txskbs[tx];
+
+		if (!(data->txring[tx].misc & TSI108_TX_OK))
+			printk("%s: bad tx packet, misc %x\n",
+			       dev->name, data->txring[tx].misc);
+
+		data->txtail = (data->txtail + 1) % TSI108_TXRING_LEN;
+		data->txfree++;
+
+		if (data->txring[tx].misc & TSI108_TX_EOF) {
+			dev_kfree_skb_any(skb);
+			release++;
+		}
+	}
+
+	if (release) {
+		if (is_valid_ether_addr(dev->dev_addr) && data->link_up)
+			netif_wake_queue(dev);
+	}
+}
+
+static int tsi108_send_packet(struct sk_buff * skb, struct net_device *dev)
+{
+	struct tsi108_prv_data *data = netdev_priv(dev);
+	int frags = skb_shinfo(skb)->nr_frags + 1;
+	int i;
+
+	if (!data->phy_ok && net_ratelimit())
+		printk(KERN_ERR "%s: Transmit while PHY is down!\n", dev->name);
+
+	if (!data->link_up) {
+		printk(KERN_ERR "%s: Transmit while link is down!\n",
+		       dev->name);
+		netif_stop_queue(dev);
+		return NETDEV_TX_BUSY;
+	}
+
+	if (data->txfree < MAX_SKB_FRAGS + 1) {
+		netif_stop_queue(dev);
+
+		if (net_ratelimit())
+			printk(KERN_ERR "%s: Transmit with full tx ring!\n",
+			       dev->name);
+		return NETDEV_TX_BUSY;
+	}
+
+	if (data->txfree - frags < MAX_SKB_FRAGS + 1) {
+		netif_stop_queue(dev);
+	}
+
+	spin_lock_irq(&data->txlock);
+
+	for (i = 0; i < frags; i++) {
+		int misc = 0;
+		int tx = data->txhead;
+
+		/* This is done to mark every TSI108_TX_INT_FREQ tx buffers with
+		 * the interrupt bit.  TX descriptor-complete interrupts are
+		 * enabled when the queue fills up, and masked when there is
+		 * still free space.  This way, when saturating the outbound
+		 * link, the tx interrupts are kept to a reasonable level.
+		 * When the queue is not full, reclamation of skbs still occurs
+		 * as new packets are transmitted, or on a queue-empty
+		 * interrupt.
+		 */
+
+		if ((tx % TSI108_TX_INT_FREQ == 0) &&
+		    ((TSI108_TXRING_LEN - data->txfree) >= TSI108_TX_INT_FREQ))
+			misc = TSI108_TX_INT;
+
+		data->txskbs[tx] = skb;
+
+		if (i == 0) {
+			data->txring[tx].buf0 = dma_map_single(NULL, skb->data,
+					skb->len - skb->data_len, DMA_TO_DEVICE);
+			data->txring[tx].len = skb->len - skb->data_len;
+			misc |= TSI108_TX_SOF;
+		} else {
+			skb_frag_t *frag = &skb_shinfo(skb)->frags[i - 1];
+
+			data->txring[tx].buf0 =
+			    dma_map_page(NULL, frag->page, frag->page_offset,
+					    frag->size, DMA_TO_DEVICE);
+			data->txring[tx].len = frag->size;
+		}
+
+		if (i == frags - 1)
+			misc |= TSI108_TX_EOF;
+
+		if (netif_msg_pktdata(data)) {
+			int i;
+			printk("%s: Tx Frame contents (%d)\n", dev->name,
+			       skb->len);
+			for (i = 0; i < skb->len; i++)
+				printk(" %2.2x", skb->data[i]);
+			printk(".\n");
+		}
+		data->txring[tx].misc = misc | TSI108_TX_OWN;
+
+		data->txhead = (data->txhead + 1) % TSI108_TXRING_LEN;
+		data->txfree--;
+	}
+
+	tsi108_complete_tx(dev);
+
+	/* This must be done after the check for completed tx descriptors,
+	 * so that the tail pointer is correct.
+	 */
+
+	if (!(TSI_READ(TSI108_EC_TXSTAT) & TSI108_EC_TXSTAT_QUEUE0))
+		tsi108_restart_tx(data);
+
+	spin_unlock_irq(&data->txlock);
+	return NETDEV_TX_OK;
+}
+
+static int tsi108_complete_rx(struct net_device *dev, int budget)
+{
+	struct tsi108_prv_data *data = netdev_priv(dev);
+	int done = 0;
+
+	while (data->rxfree && done != budget) {
+		int rx = data->rxtail;
+		struct sk_buff *skb;
+
+		if (data->rxring[rx].misc & TSI108_RX_OWN)
+			break;
+
+		skb = data->rxskbs[rx];
+		data->rxtail = (data->rxtail + 1) % TSI108_RXRING_LEN;
+		data->rxfree--;
+		done++;
+
+		if (data->rxring[rx].misc & TSI108_RX_BAD) {
+			spin_lock_irq(&data->misclock);
+
+			if (data->rxring[rx].misc & TSI108_RX_CRC)
+				data->stats.rx_crc_errors++;
+			if (data->rxring[rx].misc & TSI108_RX_OVER)
+				data->stats.rx_fifo_errors++;
+
+			spin_unlock_irq(&data->misclock);
+
+			dev_kfree_skb_any(skb);
+			continue;
+		}
+		if (netif_msg_pktdata(data)) {
+			int i;
+			printk("%s: Rx Frame contents (%d)\n",
+			       dev->name, data->rxring[rx].len);
+			for (i = 0; i < data->rxring[rx].len; i++)
+				printk(" %2.2x", skb->data[i]);
+			printk(".\n");
+		}
+
+		skb->dev = dev;
+		skb_put(skb, data->rxring[rx].len);
+		skb->protocol = eth_type_trans(skb, dev);
+		netif_receive_skb(skb);
+		dev->last_rx = jiffies;
+	}
+
+	return done;
+}
+
+static int tsi108_refill_rx(struct net_device *dev, int budget)
+{
+	struct tsi108_prv_data *data = netdev_priv(dev);
+	int done = 0;
+
+	while (data->rxfree != TSI108_RXRING_LEN && done != budget) {
+		int rx = data->rxhead;
+		struct sk_buff *skb;
+
+		data->rxskbs[rx] = skb = dev_alloc_skb(TSI108_RXBUF_SIZE + 2);
+		if (!skb)
+			break;
+
+		skb_reserve(skb, 2); /* Align the data on a 4-byte boundary. */
+
+		data->rxring[rx].buf0 = dma_map_single(NULL, skb->data,
+							TSI108_RX_SKB_SIZE,
+							DMA_FROM_DEVICE);
+
+		/* Sometimes the hardware sets blen to zero after packet
+		 * reception, even though the manual says that it's only ever
+		 * modified by the driver.
+		 */
+
+		data->rxring[rx].blen = TSI108_RX_SKB_SIZE;
+		data->rxring[rx].misc = TSI108_RX_OWN | TSI108_RX_INT;
+
+		data->rxhead = (data->rxhead + 1) % TSI108_RXRING_LEN;
+		data->rxfree++;
+		done++;
+	}
+
+	if (done != 0 && !(TSI_READ(TSI108_EC_RXSTAT) &
+			   TSI108_EC_RXSTAT_QUEUE0))
+		tsi108_restart_rx(data, dev);
+
+	return done;
+}
+
+static int tsi108_poll(struct net_device *dev, int *budget)
+{
+	struct tsi108_prv_data *data = netdev_priv(dev);
+	u32 estat = TSI_READ(TSI108_EC_RXESTAT);
+	u32 intstat = TSI_READ(TSI108_EC_INTSTAT);
+	int total_budget = min(*budget, dev->quota);
+	int num_received = 0, num_filled = 0, budget_used;
+
+	intstat &= TSI108_INT_RXQUEUE0 | TSI108_INT_RXTHRESH |
+	    TSI108_INT_RXOVERRUN | TSI108_INT_RXERROR | TSI108_INT_RXWAIT;
+
+	TSI_WRITE(TSI108_EC_RXESTAT, estat);
+	TSI_WRITE(TSI108_EC_INTSTAT, intstat);
+
+	if (data->rxpending || (estat & TSI108_EC_RXESTAT_Q0_DESCINT))
+		num_received = tsi108_complete_rx(dev, total_budget);
+
+	/* This should normally fill no more slots than the number of
+	 * packets received in tsi108_complete_rx().  The exception
+	 * is when we previously ran out of memory for RX SKBs.  In that
+	 * case, it's helpful to obey the budget, not only so that the
+	 * CPU isn't hogged, but so that memory (which may still be low)
+	 * is not hogged by one device.
+	 *
+	 * A work unit is considered to be two SKBs to allow us to catch
+	 * up when the ring has shrunk due to out-of-memory but we're
+	 * still removing the full budget's worth of packets each time.
+	 */
+
+	if (data->rxfree < TSI108_RXRING_LEN)
+		num_filled = tsi108_refill_rx(dev, total_budget * 2);
+
+	if (intstat & TSI108_INT_RXERROR) {
+		u32 err = TSI_READ(TSI108_EC_RXERR);
+		TSI_WRITE(TSI108_EC_RXERR, err);
+
+		if (err) {
+			if (net_ratelimit())
+				printk(KERN_DEBUG "%s: RX error %x\n",
+				       dev->name, err);
+
+			if (!(TSI_READ(TSI108_EC_RXSTAT) &
+			      TSI108_EC_RXSTAT_QUEUE0))
+				tsi108_restart_rx(data, dev);
+		}
+	}
+
+	if (intstat & TSI108_INT_RXOVERRUN) {
+		spin_lock_irq(&data->misclock);
+		data->stats.rx_fifo_errors++;
+		spin_unlock_irq(&data->misclock);
+	}
+
+	budget_used = max(num_received, num_filled / 2);
+
+	*budget -= budget_used;
+	dev->quota -= budget_used;
+
+	if (budget_used != total_budget) {
+		data->rxpending = 0;
+		netif_rx_complete(dev);
+
+		TSI_WRITE(TSI108_EC_INTMASK,
+				     TSI_READ(TSI108_EC_INTMASK)
+				     & ~(TSI108_INT_RXQUEUE0
+					 | TSI108_INT_RXTHRESH |
+					 TSI108_INT_RXOVERRUN |
+					 TSI108_INT_RXERROR |
+					 TSI108_INT_RXWAIT));
+
+		/* IRQs are level-triggered, so no need to re-check */
+		return 0;
+	} else {
+		data->rxpending = 1;
+	}
+
+	return 1;
+}
+
+static void tsi108_rx_int(struct net_device *dev)
+{
+	struct tsi108_prv_data *data = netdev_priv(dev);
+
+	/* A race could cause dev to already be scheduled, so it's not an
+	 * error if that happens (and interrupts shouldn't be re-masked,
+	 * because that can cause harmful races, if poll has already
+	 * unmasked them but not cleared LINK_STATE_SCHED).
+	 *
+	 * This can happen if this code races with tsi108_poll(), which masks
+	 * the interrupts after tsi108_irq_one() read the mask, but before
+	 * netif_rx_schedule is called.  It could also happen due to calls
+	 * from tsi108_check_rxring().
+	 */
+
+	if (netif_rx_schedule_prep(dev)) {
+		/* Mask, rather than ack, the receive interrupts.  The ack
+		 * will happen in tsi108_poll().
+		 */
+
+		TSI_WRITE(TSI108_EC_INTMASK,
+				     TSI_READ(TSI108_EC_INTMASK) |
+				     TSI108_INT_RXQUEUE0
+				     | TSI108_INT_RXTHRESH |
+				     TSI108_INT_RXOVERRUN | TSI108_INT_RXERROR |
+				     TSI108_INT_RXWAIT);
+		__netif_rx_schedule(dev);
+	} else {
+		if (!netif_running(dev)) {
+			/* This can happen if an interrupt occurs while the
+			 * interface is being brought down, as the START
+			 * bit is cleared before the stop function is called.
+			 *
+			 * In this case, the interrupts must be masked, or
+			 * they will continue indefinitely.
+			 *
+			 * There's a race here if the interface is brought down
+			 * and then up in rapid succession, as the device could
+			 * be made running after the above check and before
+			 * the masking below.  This will only happen if the IRQ
+			 * thread has a lower priority than the task brining
+			 * up the interface.  Fixing this race would likely
+			 * require changes in generic code.
+			 */
+
+			TSI_WRITE(TSI108_EC_INTMASK,
+					     TSI_READ
+					     (TSI108_EC_INTMASK) |
+					     TSI108_INT_RXQUEUE0 |
+					     TSI108_INT_RXTHRESH |
+					     TSI108_INT_RXOVERRUN |
+					     TSI108_INT_RXERROR |
+					     TSI108_INT_RXWAIT);
+		}
+	}
+}
+
+/* If the RX ring has run out of memory, try periodically
+ * to allocate some more, as otherwise poll would never
+ * get called (apart from the initial end-of-queue condition).
+ *
+ * This is called once per second (by default) from the thread.
+ */
+
+static void tsi108_check_rxring(struct net_device *dev)
+{
+	struct tsi108_prv_data *data = netdev_priv(dev);
+
+	/* A poll is scheduled, as opposed to caling tsi108_refill_rx
+	 * directly, so as to keep the receive path single-threaded
+	 * (and thus not needing a lock).
+	 */
+
+	if (netif_running(dev) && data->rxfree < TSI108_RXRING_LEN / 4)
+		tsi108_rx_int(dev);
+}
+
+static void tsi108_tx_int(struct net_device *dev)
+{
+	struct tsi108_prv_data *data = netdev_priv(dev);
+	u32 estat = TSI_READ(TSI108_EC_TXESTAT);
+
+	TSI_WRITE(TSI108_EC_TXESTAT, estat);
+	TSI_WRITE(TSI108_EC_INTSTAT, TSI108_INT_TXQUEUE0 |
+			     TSI108_INT_TXIDLE | TSI108_INT_TXERROR);
+	if (estat & TSI108_EC_TXESTAT_Q0_ERR) {
+		u32 err = TSI_READ(TSI108_EC_TXERR);
+		TSI_WRITE(T