ioc3-eth/meth: Move the SGI drivers

Move the SGI drivers into drivers/net/ethernet/sgi/ and make the
necessary Kconfig and Makefile changes.

CC: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

7 files changed, 2824 insertions, 0 deletions

diff --git a/drivers/net/ethernet/Kconfig b/drivers/net/ethernet/Kconfig
index ed428501abba..7d25fa490a25 100644
--- a/drivers/net/ethernet/Kconfig
+++ b/drivers/net/ethernet/Kconfig
@@ -37,6 +37,7 @@ source "drivers/net/ethernet/qlogic/Kconfig"
 source "drivers/net/ethernet/racal/Kconfig"
 source "drivers/net/ethernet/realtek/Kconfig"
 source "drivers/net/ethernet/sfc/Kconfig"
+source "drivers/net/ethernet/sgi/Kconfig"
 source "drivers/net/ethernet/smsc/Kconfig"
 source "drivers/net/ethernet/stmicro/Kconfig"
 source "drivers/net/ethernet/sun/Kconfig"
diff --git a/drivers/net/ethernet/Makefile b/drivers/net/ethernet/Makefile
index 3de82490adec..ec587159eec1 100644
--- a/drivers/net/ethernet/Makefile
+++ b/drivers/net/ethernet/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_NET_VENDOR_QLOGIC) += qlogic/
 obj-$(CONFIG_NET_VENDOR_RACAL) += racal/
 obj-$(CONFIG_NET_VENDOR_REALTEK) += realtek/
 obj-$(CONFIG_SFC) += sfc/
+obj-$(CONFIG_NET_VENDOR_SGI) += sgi/
 obj-$(CONFIG_NET_VENDOR_SMSC) += smsc/
 obj-$(CONFIG_NET_VENDOR_STMICRO) += stmicro/
 obj-$(CONFIG_NET_VENDOR_SUN) += sun/
diff --git a/drivers/net/ethernet/sgi/Kconfig b/drivers/net/ethernet/sgi/Kconfig
new file mode 100644
index 000000000000..3098594ab274
--- /dev/null
+++ b/drivers/net/ethernet/sgi/Kconfig
@@ -0,0 +1,34 @@
+#
+# SGI device configuration
+#
+
+config NET_VENDOR_SGI
+	bool "SGI devices"
+	depends on (PCI && SGI_IP27) || SGI_IP32
+	---help---
+	  If you have a network (Ethernet) card belonging to this class, say Y
+	  and read the Ethernet-HOWTO, available from
+	  <http://www.tldp.org/docs.html#howto>.
+
+	  Note that the answer to this question doesn't directly affect the
+	  kernel: saying N will just cause the configurator to skip all
+	  the questions about SGI devices. If you say Y, you will be asked for
+	  your specific card in the following questions.
+
+if NET_VENDOR_SGI
+
+config SGI_IOC3_ETH
+	bool "SGI IOC3 Ethernet"
+	depends on PCI && SGI_IP27
+	select CRC32
+	select MII
+	---help---
+	  If you have a network (Ethernet) card of this type, say Y and read
+	  the Ethernet-HOWTO, available from
+	  <http://www.tldp.org/docs.html#howto>.
+
+config SGI_O2MACE_ETH
+	tristate "SGI O2 MACE Fast Ethernet support"
+	depends on SGI_IP32=y
+
+endif # NET_VENDOR_SGI
diff --git a/drivers/net/ethernet/sgi/Makefile b/drivers/net/ethernet/sgi/Makefile
new file mode 100644
index 000000000000..e5bedd271e29
--- /dev/null
+++ b/drivers/net/ethernet/sgi/Makefile
@@ -0,0 +1,6 @@
+#
+# Makefile for the SGI device drivers.
+#
+
+obj-$(CONFIG_SGI_O2MACE_ETH) += meth.o
+obj-$(CONFIG_SGI_IOC3_ETH) += ioc3-eth.o
diff --git a/drivers/net/ethernet/sgi/ioc3-eth.c b/drivers/net/ethernet/sgi/ioc3-eth.c
new file mode 100644
index 000000000000..a234e4504522
--- /dev/null
+++ b/drivers/net/ethernet/sgi/ioc3-eth.c
@@ -0,0 +1,1684 @@
+/*
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ *
+ * Driver for SGI's IOC3 based Ethernet cards as found in the PCI card.
+ *
+ * Copyright (C) 1999, 2000, 01, 03, 06 Ralf Baechle
+ * Copyright (C) 1995, 1999, 2000, 2001 by Silicon Graphics, Inc.
+ *
+ * References:
+ *  o IOC3 ASIC specification 4.51, 1996-04-18
+ *  o IEEE 802.3 specification, 2000 edition
+ *  o DP38840A Specification, National Semiconductor, March 1997
+ *
+ * To do:
+ *
+ *  o Handle allocation failures in ioc3_alloc_skb() more gracefully.
+ *  o Handle allocation failures in ioc3_init_rings().
+ *  o Use prefetching for large packets.  What is a good lower limit for
+ *    prefetching?
+ *  o We're probably allocating a bit too much memory.
+ *  o Use hardware checksums.
+ *  o Convert to using a IOC3 meta driver.
+ *  o Which PHYs might possibly be attached to the IOC3 in real live,
+ *    which workarounds are required for them?  Do we ever have Lucent's?
+ *  o For the 2.5 branch kill the mii-tool ioctls.
+ */
+
+#define IOC3_NAME	"ioc3-eth"
+#define IOC3_VERSION	"2.6.3-4"
+
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/errno.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/crc32.h>
+#include <linux/mii.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <linux/tcp.h>
+#include <linux/udp.h>
+#include <linux/dma-mapping.h>
+#include <linux/gfp.h>
+
+#ifdef CONFIG_SERIAL_8250
+#include <linux/serial_core.h>
+#include <linux/serial_8250.h>
+#include <linux/serial_reg.h>
+#endif
+
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/ethtool.h>
+#include <linux/skbuff.h>
+#include <net/ip.h>
+
+#include <asm/byteorder.h>
+#include <asm/io.h>
+#include <asm/pgtable.h>
+#include <asm/uaccess.h>
+#include <asm/sn/types.h>
+#include <asm/sn/ioc3.h>
+#include <asm/pci/bridge.h>
+
+/*
+ * 64 RX buffers.  This is tunable in the range of 16 <= x < 512.  The
+ * value must be a power of two.
+ */
+#define RX_BUFFS 64
+
+#define ETCSR_FD	((17<<ETCSR_IPGR2_SHIFT) | (11<<ETCSR_IPGR1_SHIFT) | 21)
+#define ETCSR_HD	((21<<ETCSR_IPGR2_SHIFT) | (21<<ETCSR_IPGR1_SHIFT) | 21)
+
+/* Private per NIC data of the driver.  */
+struct ioc3_private {
+	struct ioc3 *regs;
+	unsigned long *rxr;		/* pointer to receiver ring */
+	struct ioc3_etxd *txr;
+	struct sk_buff *rx_skbs[512];
+	struct sk_buff *tx_skbs[128];
+	int rx_ci;			/* RX consumer index */
+	int rx_pi;			/* RX producer index */
+	int tx_ci;			/* TX consumer index */
+	int tx_pi;			/* TX producer index */
+	int txqlen;
+	u32 emcr, ehar_h, ehar_l;
+	spinlock_t ioc3_lock;
+	struct mii_if_info mii;
+
+	struct pci_dev *pdev;
+
+	/* Members used by autonegotiation  */
+	struct timer_list ioc3_timer;
+};
+
+static inline struct net_device *priv_netdev(struct ioc3_private *dev)
+{
+	return (void *)dev - ((sizeof(struct net_device) + 31) & ~31);
+}
+
+static int ioc3_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
+static void ioc3_set_multicast_list(struct net_device *dev);
+static int ioc3_start_xmit(struct sk_buff *skb, struct net_device *dev);
+static void ioc3_timeout(struct net_device *dev);
+static inline unsigned int ioc3_hash(const unsigned char *addr);
+static inline void ioc3_stop(struct ioc3_private *ip);
+static void ioc3_init(struct net_device *dev);
+
+static const char ioc3_str[] = "IOC3 Ethernet";
+static const struct ethtool_ops ioc3_ethtool_ops;
+
+/* We use this to acquire receive skb's that we can DMA directly into. */
+
+#define IOC3_CACHELINE	128UL
+
+static inline unsigned long aligned_rx_skb_addr(unsigned long addr)
+{
+	return (~addr + 1) & (IOC3_CACHELINE - 1UL);
+}
+
+static inline struct sk_buff * ioc3_alloc_skb(unsigned long length,
+	unsigned int gfp_mask)
+{
+	struct sk_buff *skb;
+
+	skb = alloc_skb(length + IOC3_CACHELINE - 1, gfp_mask);
+	if (likely(skb)) {
+		int offset = aligned_rx_skb_addr((unsigned long) skb->data);
+		if (offset)
+			skb_reserve(skb, offset);
+	}
+
+	return skb;
+}
+
+static inline unsigned long ioc3_map(void *ptr, unsigned long vdev)
+{
+#ifdef CONFIG_SGI_IP27
+	vdev <<= 57;   /* Shift to PCI64_ATTR_VIRTUAL */
+
+	return vdev | (0xaUL << PCI64_ATTR_TARG_SHFT) | PCI64_ATTR_PREF |
+	       ((unsigned long)ptr & TO_PHYS_MASK);
+#else
+	return virt_to_bus(ptr);
+#endif
+}
+
+/* BEWARE: The IOC3 documentation documents the size of rx buffers as
+   1644 while it's actually 1664.  This one was nasty to track down ...  */
+#define RX_OFFSET		10
+#define RX_BUF_ALLOC_SIZE	(1664 + RX_OFFSET + IOC3_CACHELINE)
+
+/* DMA barrier to separate cached and uncached accesses.  */
+#define BARRIER()							\
+	__asm__("sync" ::: "memory")
+
+
+#define IOC3_SIZE 0x100000
+
+/*
+ * IOC3 is a big endian device
+ *
+ * Unorthodox but makes the users of these macros more readable - the pointer
+ * to the IOC3's memory mapped registers is expected as struct ioc3 * ioc3
+ * in the environment.
+ */
+#define ioc3_r_mcr()		be32_to_cpu(ioc3->mcr)
+#define ioc3_w_mcr(v)		do { ioc3->mcr = cpu_to_be32(v); } while (0)
+#define ioc3_w_gpcr_s(v)	do { ioc3->gpcr_s = cpu_to_be32(v); } while (0)
+#define ioc3_r_emcr()		be32_to_cpu(ioc3->emcr)
+#define ioc3_w_emcr(v)		do { ioc3->emcr = cpu_to_be32(v); } while (0)
+#define ioc3_r_eisr()		be32_to_cpu(ioc3->eisr)
+#define ioc3_w_eisr(v)		do { ioc3->eisr = cpu_to_be32(v); } while (0)
+#define ioc3_r_eier()		be32_to_cpu(ioc3->eier)
+#define ioc3_w_eier(v)		do { ioc3->eier = cpu_to_be32(v); } while (0)
+#define ioc3_r_ercsr()		be32_to_cpu(ioc3->ercsr)
+#define ioc3_w_ercsr(v)		do { ioc3->ercsr = cpu_to_be32(v); } while (0)
+#define ioc3_r_erbr_h()		be32_to_cpu(ioc3->erbr_h)
+#define ioc3_w_erbr_h(v)	do { ioc3->erbr_h = cpu_to_be32(v); } while (0)
+#define ioc3_r_erbr_l()		be32_to_cpu(ioc3->erbr_l)
+#define ioc3_w_erbr_l(v)	do { ioc3->erbr_l = cpu_to_be32(v); } while (0)
+#define ioc3_r_erbar()		be32_to_cpu(ioc3->erbar)
+#define ioc3_w_erbar(v)		do { ioc3->erbar = cpu_to_be32(v); } while (0)
+#define ioc3_r_ercir()		be32_to_cpu(ioc3->ercir)
+#define ioc3_w_ercir(v)		do { ioc3->ercir = cpu_to_be32(v); } while (0)
+#define ioc3_r_erpir()		be32_to_cpu(ioc3->erpir)
+#define ioc3_w_erpir(v)		do { ioc3->erpir = cpu_to_be32(v); } while (0)
+#define ioc3_r_ertr()		be32_to_cpu(ioc3->ertr)
+#define ioc3_w_ertr(v)		do { ioc3->ertr = cpu_to_be32(v); } while (0)
+#define ioc3_r_etcsr()		be32_to_cpu(ioc3->etcsr)
+#define ioc3_w_etcsr(v)		do { ioc3->etcsr = cpu_to_be32(v); } while (0)
+#define ioc3_r_ersr()		be32_to_cpu(ioc3->ersr)
+#define ioc3_w_ersr(v)		do { ioc3->ersr = cpu_to_be32(v); } while (0)
+#define ioc3_r_etcdc()		be32_to_cpu(ioc3->etcdc)
+#define ioc3_w_etcdc(v)		do { ioc3->etcdc = cpu_to_be32(v); } while (0)
+#define ioc3_r_ebir()		be32_to_cpu(ioc3->ebir)
+#define ioc3_w_ebir(v)		do { ioc3->ebir = cpu_to_be32(v); } while (0)
+#define ioc3_r_etbr_h()		be32_to_cpu(ioc3->etbr_h)
+#define ioc3_w_etbr_h(v)	do { ioc3->etbr_h = cpu_to_be32(v); } while (0)
+#define ioc3_r_etbr_l()		be32_to_cpu(ioc3->etbr_l)
+#define ioc3_w_etbr_l(v)	do { ioc3->etbr_l = cpu_to_be32(v); } while (0)
+#define ioc3_r_etcir()		be32_to_cpu(ioc3->etcir)
+#define ioc3_w_etcir(v)		do { ioc3->etcir = cpu_to_be32(v); } while (0)
+#define ioc3_r_etpir()		be32_to_cpu(ioc3->etpir)
+#define ioc3_w_etpir(v)		do { ioc3->etpir = cpu_to_be32(v); } while (0)
+#define ioc3_r_emar_h()		be32_to_cpu(ioc3->emar_h)
+#define ioc3_w_emar_h(v)	do { ioc3->emar_h = cpu_to_be32(v); } while (0)
+#define ioc3_r_emar_l()		be32_to_cpu(ioc3->emar_l)
+#define ioc3_w_emar_l(v)	do { ioc3->emar_l = cpu_to_be32(v); } while (0)
+#define ioc3_r_ehar_h()		be32_to_cpu(ioc3->ehar_h)
+#define ioc3_w_ehar_h(v)	do { ioc3->ehar_h = cpu_to_be32(v); } while (0)
+#define ioc3_r_ehar_l()		be32_to_cpu(ioc3->ehar_l)
+#define ioc3_w_ehar_l(v)	do { ioc3->ehar_l = cpu_to_be32(v); } while (0)
+#define ioc3_r_micr()		be32_to_cpu(ioc3->micr)
+#define ioc3_w_micr(v)		do { ioc3->micr = cpu_to_be32(v); } while (0)
+#define ioc3_r_midr_r()		be32_to_cpu(ioc3->midr_r)
+#define ioc3_w_midr_r(v)	do { ioc3->midr_r = cpu_to_be32(v); } while (0)
+#define ioc3_r_midr_w()		be32_to_cpu(ioc3->midr_w)
+#define ioc3_w_midr_w(v)	do { ioc3->midr_w = cpu_to_be32(v); } while (0)
+
+static inline u32 mcr_pack(u32 pulse, u32 sample)
+{
+	return (pulse << 10) | (sample << 2);
+}
+
+static int nic_wait(struct ioc3 *ioc3)
+{
+	u32 mcr;
+
+        do {
+                mcr = ioc3_r_mcr();
+        } while (!(mcr & 2));
+
+        return mcr & 1;
+}
+
+static int nic_reset(struct ioc3 *ioc3)
+{
+        int presence;
+
+	ioc3_w_mcr(mcr_pack(500, 65));
+	presence = nic_wait(ioc3);
+
+	ioc3_w_mcr(mcr_pack(0, 500));
+	nic_wait(ioc3);
+
+        return presence;
+}
+
+static inline int nic_read_bit(struct ioc3 *ioc3)
+{
+	int result;
+
+	ioc3_w_mcr(mcr_pack(6, 13));
+	result = nic_wait(ioc3);
+	ioc3_w_mcr(mcr_pack(0, 100));
+	nic_wait(ioc3);
+
+	return result;
+}
+
+static inline void nic_write_bit(struct ioc3 *ioc3, int bit)
+{
+	if (bit)
+		ioc3_w_mcr(mcr_pack(6, 110));
+	else
+		ioc3_w_mcr(mcr_pack(80, 30));
+
+	nic_wait(ioc3);
+}
+
+/*
+ * Read a byte from an iButton device
+ */
+static u32 nic_read_byte(struct ioc3 *ioc3)
+{
+	u32 result = 0;
+	int i;
+
+	for (i = 0; i < 8; i++)
+		result = (result >> 1) | (nic_read_bit(ioc3) << 7);
+
+	return result;
+}
+
+/*
+ * Write a byte to an iButton device
+ */
+static void nic_write_byte(struct ioc3 *ioc3, int byte)
+{
+	int i, bit;
+
+	for (i = 8; i; i--) {
+		bit = byte & 1;
+		byte >>= 1;
+
+		nic_write_bit(ioc3, bit);
+	}
+}
+
+static u64 nic_find(struct ioc3 *ioc3, int *last)
+{
+	int a, b, index, disc;
+	u64 address = 0;
+
+	nic_reset(ioc3);
+	/* Search ROM.  */
+	nic_write_byte(ioc3, 0xf0);
+
+	/* Algorithm from ``Book of iButton Standards''.  */
+	for (index = 0, disc = 0; index < 64; index++) {
+		a = nic_read_bit(ioc3);
+		b = nic_read_bit(ioc3);
+
+		if (a && b) {
+			printk("NIC search failed (not fatal).\n");
+			*last = 0;
+			return 0;
+		}
+
+		if (!a && !b) {
+			if (index == *last) {
+				address |= 1UL << index;
+			} else if (index > *last) {
+				address &= ~(1UL << index);
+				disc = index;
+			} else if ((address & (1UL << index)) == 0)
+				disc = index;
+			nic_write_bit(ioc3, address & (1UL << index));
+			continue;
+		} else {
+			if (a)
+				address |= 1UL << index;
+			else
+				address &= ~(1UL << index);
+			nic_write_bit(ioc3, a);
+			continue;
+		}
+	}
+
+	*last = disc;
+
+	return address;
+}
+
+static int nic_init(struct ioc3 *ioc3)
+{
+	const char *unknown = "unknown";
+	const char *type = unknown;
+	u8 crc;
+	u8 serial[6];
+	int save = 0, i;
+
+	while (1) {
+		u64 reg;
+		reg = nic_find(ioc3, &save);
+
+		switch (reg & 0xff) {
+		case 0x91:
+			type = "DS1981U";
+			break;
+		default:
+			if (save == 0) {
+				/* Let the caller try again.  */
+				return -1;
+			}
+			continue;
+		}
+
+		nic_reset(ioc3);
+
+		/* Match ROM.  */
+		nic_write_byte(ioc3, 0x55);
+		for (i = 0; i < 8; i++)
+			nic_write_byte(ioc3, (reg >> (i << 3)) & 0xff);
+
+		reg >>= 8; /* Shift out type.  */
+		for (i = 0; i < 6; i++) {
+			serial[i] = reg & 0xff;
+			reg >>= 8;
+		}
+		crc = reg & 0xff;
+		break;
+	}
+
+	printk("Found %s NIC", type);
+	if (type != unknown)
+		printk (" registration number %pM, CRC %02x", serial, crc);
+	printk(".\n");
+
+	return 0;
+}
+
+/*
+ * Read the NIC (Number-In-a-Can) device used to store the MAC address on
+ * SN0 / SN00 nodeboards and PCI cards.
+ */
+static void ioc3_get_eaddr_nic(struct ioc3_private *ip)
+{
+	struct ioc3 *ioc3 = ip->regs;
+	u8 nic[14];
+	int tries = 2; /* There may be some problem with the battery?  */
+	int i;
+
+	ioc3_w_gpcr_s(1 << 21);
+
+	while (tries--) {
+		if (!nic_init(ioc3))
+			break;
+		udelay(500);
+	}
+
+	if (tries < 0) {
+		printk("Failed to read MAC address\n");
+		return;
+	}
+
+	/* Read Memory.  */
+	nic_write_byte(ioc3, 0xf0);
+	nic_write_byte(ioc3, 0x00);
+	nic_write_byte(ioc3, 0x00);
+
+	for (i = 13; i >= 0; i--)
+		nic[i] = nic_read_byte(ioc3);
+
+	for (i = 2; i < 8; i++)
+		priv_netdev(ip)->dev_addr[i - 2] = nic[i];
+}
+
+/*
+ * Ok, this is hosed by design.  It's necessary to know what machine the
+ * NIC is in in order to know how to read the NIC address.  We also have
+ * to know if it's a PCI card or a NIC in on the node board ...
+ */
+static void ioc3_get_eaddr(struct ioc3_private *ip)
+{
+	ioc3_get_eaddr_nic(ip);
+
+	printk("Ethernet address is %pM.\n", priv_netdev(ip)->dev_addr);
+}
+
+static void __ioc3_set_mac_address(struct net_device *dev)
+{
+	struct ioc3_private *ip = netdev_priv(dev);
+	struct ioc3 *ioc3 = ip->regs;
+
+	ioc3_w_emar_h((dev->dev_addr[5] <<  8) | dev->dev_addr[4]);
+	ioc3_w_emar_l((dev->dev_addr[3] << 24) | (dev->dev_addr[2] << 16) |
+	              (dev->dev_addr[1] <<  8) | dev->dev_addr[0]);
+}
+
+static int ioc3_set_mac_address(struct net_device *dev, void *addr)
+{
+	struct ioc3_private *ip = netdev_priv(dev);
+	struct sockaddr *sa = addr;
+
+	memcpy(dev->dev_addr, sa->sa_data, dev->addr_len);
+
+	spin_lock_irq(&ip->ioc3_lock);
+	__ioc3_set_mac_address(dev);
+	spin_unlock_irq(&ip->ioc3_lock);
+
+	return 0;
+}
+
+/*
+ * Caller must hold the ioc3_lock ever for MII readers.  This is also
+ * used to protect the transmitter side but it's low contention.
+ */
+static int ioc3_mdio_read(struct net_device *dev, int phy, int reg)
+{
+	struct ioc3_private *ip = netdev_priv(dev);
+	struct ioc3 *ioc3 = ip->regs;
+
+	while (ioc3_r_micr() & MICR_BUSY);
+	ioc3_w_micr((phy << MICR_PHYADDR_SHIFT) | reg | MICR_READTRIG);
+	while (ioc3_r_micr() & MICR_BUSY);
+
+	return ioc3_r_midr_r() & MIDR_DATA_MASK;
+}
+
+static void ioc3_mdio_write(struct net_device *dev, int phy, int reg, int data)
+{
+	struct ioc3_private *ip = netdev_priv(dev);
+	struct ioc3 *ioc3 = ip->regs;
+
+	while (ioc3_r_micr() & MICR_BUSY);
+	ioc3_w_midr_w(data);
+	ioc3_w_micr((phy << MICR_PHYADDR_SHIFT) | reg);
+	while (ioc3_r_micr() & MICR_BUSY);
+}
+
+static int ioc3_mii_init(struct ioc3_private *ip);
+
+static struct net_device_stats *ioc3_get_stats(struct net_device *dev)
+{
+	struct ioc3_private *ip = netdev_priv(dev);
+	struct ioc3 *ioc3 = ip->regs;
+
+	dev->stats.collisions += (ioc3_r_etcdc() & ETCDC_COLLCNT_MASK);
+	return &dev->stats;
+}
+
+static void ioc3_tcpudp_checksum(struct sk_buff *skb, uint32_t hwsum, int len)
+{
+	struct ethhdr *eh = eth_hdr(skb);
+	uint32_t csum, ehsum;
+	unsigned int proto;
+	struct iphdr *ih;
+	uint16_t *ew;
+	unsigned char *cp;
+
+	/*
+	 * Did hardware handle the checksum at all?  The cases we can handle
+	 * are:
+	 *
+	 * - TCP and UDP checksums of IPv4 only.
+	 * - IPv6 would be doable but we keep that for later ...
+	 * - Only unfragmented packets.  Did somebody already tell you
+	 *   fragmentation is evil?
+	 * - don't care about packet size.  Worst case when processing a
+	 *   malformed packet we'll try to access the packet at ip header +
+	 *   64 bytes which is still inside the skb.  Even in the unlikely
+	 *   case where the checksum is right the higher layers will still
+	 *   drop the packet as appropriate.
+	 */
+	if (eh->h_proto != htons(ETH_P_IP))
+		return;
+
+	ih = (struct iphdr *) ((char *)eh + ETH_HLEN);
+	if (ip_is_fragment(ih))
+		return;
+
+	proto = ih->protocol;
+	if (proto != IPPROTO_TCP && proto != IPPROTO_UDP)
+		return;
+
+	/* Same as tx - compute csum of pseudo header  */
+	csum = hwsum +
+	       (ih->tot_len - (ih->ihl << 2)) +
+	       htons((uint16_t)ih->protocol) +
+	       (ih->saddr >> 16) + (ih->saddr & 0xffff) +
+	       (ih->daddr >> 16) + (ih->daddr & 0xffff);
+
+	/* Sum up ethernet dest addr, src addr and protocol  */
+	ew = (uint16_t *) eh;
+	ehsum = ew[0] + ew[1] + ew[2] + ew[3] + ew[4] + ew[5] + ew[6];
+
+	ehsum = (ehsum & 0xffff) + (ehsum >> 16);
+	ehsum = (ehsum & 0xffff) + (ehsum >> 16);
+
+	csum += 0xffff ^ ehsum;
+
+	/* In the next step we also subtract the 1's complement
+	   checksum of the trailing ethernet CRC.  */
+	cp = (char *)eh + len;	/* points at trailing CRC */
+	if (len & 1) {
+		csum += 0xffff ^ (uint16_t) ((cp[1] << 8) | cp[0]);
+		csum += 0xffff ^ (uint16_t) ((cp[3] << 8) | cp[2]);
+	} else {
+		csum += 0xffff ^ (uint16_t) ((cp[0] << 8) | cp[1]);
+		csum += 0xffff ^ (uint16_t) ((cp[2] << 8) | cp[3]);
+	}
+
+	csum = (csum & 0xffff) + (csum >> 16);
+	csum = (csum & 0xffff) + (csum >> 16);
+
+	if (csum == 0xffff)
+		skb->ip_summed = CHECKSUM_UNNECESSARY;
+}
+
+static inline void ioc3_rx(struct net_device *dev)
+{
+	struct ioc3_private *ip = netdev_priv(dev);
+	struct sk_buff *skb, *new_skb;
+	struct ioc3 *ioc3 = ip->regs;
+	int rx_entry, n_entry, len;
+	struct ioc3_erxbuf *rxb;
+	unsigned long *rxr;
+	u32 w0, err;
+
+	rxr = (unsigned long *) ip->rxr;		/* Ring base */
+	rx_entry = ip->rx_ci;				/* RX consume index */
+	n_entry = ip->rx_pi;
+
+	skb = ip->rx_skbs[rx_entry];
+	rxb = (struct ioc3_erxbuf *) (skb->data - RX_OFFSET);
+	w0 = be32_to_cpu(rxb->w0);
+
+	while (w0 & ERXBUF_V) {
+		err = be32_to_cpu(rxb->err);		/* It's valid ...  */
+		if (err & ERXBUF_GOODPKT) {
+			len = ((w0 >> ERXBUF_BYTECNT_SHIFT) & 0x7ff) - 4;
+			skb_trim(skb, len);
+			skb->protocol = eth_type_trans(skb, dev);
+
+			new_skb = ioc3_alloc_skb(RX_BUF_ALLOC_SIZE, GFP_ATOMIC);
+			if (!new_skb) {
+				/* Ouch, drop packet and just recycle packet
+				   to keep the ring filled.  */
+				dev->stats.rx_dropped++;
+				new_skb = skb;
+				goto next;
+			}
+
+			if (likely(dev->features & NETIF_F_RXCSUM))
+				ioc3_tcpudp_checksum(skb,
+					w0 & ERXBUF_IPCKSUM_MASK, len);
+
+			netif_rx(skb);
+
+			ip->rx_skbs[rx_entry] = NULL;	/* Poison  */
+
+			/* Because we reserve afterwards. */
+			skb_put(new_skb, (1664 + RX_OFFSET));
+			rxb = (struct ioc3_erxbuf *) new_skb->data;
+			skb_reserve(new_skb, RX_OFFSET);
+
+			dev->stats.rx_packets++;		/* Statistics */
+			dev->stats.rx_bytes += len;
+		} else {
+			/* The frame is invalid and the skb never
+			   reached the network layer so we can just
+			   recycle it.  */
+			new_skb = skb;
+			dev->stats.rx_errors++;
+		}
+		if (err & ERXBUF_CRCERR)	/* Statistics */
+			dev->stats.rx_crc_errors++;
+		if (err & ERXBUF_FRAMERR)
+			dev->stats.rx_frame_errors++;
+next:
+		ip->rx_skbs[n_entry] = new_skb;
+		rxr[n_entry] = cpu_to_be64(ioc3_map(rxb, 1));
+		rxb->w0 = 0;				/* Clear valid flag */
+		n_entry = (n_entry + 1) & 511;		/* Update erpir */
+
+		/* Now go on to the next ring entry.  */
+		rx_entry = (rx_entry + 1) & 511;
+		skb = ip->rx_skbs[rx_entry];
+		rxb = (struct ioc3_erxbuf *) (skb->data - RX_OFFSET);
+		w0 = be32_to_cpu(rxb->w0);
+	}
+	ioc3_w_erpir((n_entry << 3) | ERPIR_ARM);
+	ip->rx_pi = n_entry;
+	ip->rx_ci = rx_entry;
+}
+
+static inline void ioc3_tx(struct net_device *dev)
+{
+	struct ioc3_private *ip = netdev_priv(dev);
+	unsigned long packets, bytes;
+	struct ioc3 *ioc3 = ip->regs;
+	int tx_entry, o_entry;
+	struct sk_buff *skb;
+	u32 etcir;
+
+	spin_lock(&ip->ioc3_lock);
+	etcir = ioc3_r_etcir();
+
+	tx_entry = (etcir >> 7) & 127;
+	o_entry = ip->tx_ci;
+	packets = 0;
+	bytes = 0;
+
+	while (o_entry != tx_entry) {
+		packets++;
+		skb = ip->tx_skbs[o_entry];
+		bytes += skb->len;
+		dev_kfree_skb_irq(skb);
+		ip->tx_skbs[o_entry] = NULL;
+
+		o_entry = (o_entry + 1) & 127;		/* Next */
+
+		etcir = ioc3_r_etcir();			/* More pkts sent?  */
+		tx_entry = (etcir >> 7) & 127;
+	}
+
+	dev->stats.tx_packets += packets;
+	dev->stats.tx_bytes += bytes;
+	ip->txqlen -= packets;
+
+	if (ip->txqlen < 128)
+		netif_wake_queue(dev);
+
+	ip->tx_ci = o_entry;
+	spin_unlock(&ip->ioc3_lock);
+}
+
+/*
+ * Deal with fatal IOC3 errors.  This condition might be caused by a hard or
+ * software problems, so we should try to recover
+ * more gracefully if this ever happens.  In theory we might be flooded
+ * with such error interrupts if something really goes wrong, so we might
+ * also consider to take the interface down.
+ */
+static void ioc3_error(struct net_device *dev, u32 eisr)
+{
+	struct ioc3_private *ip = netdev_priv(dev);
+	unsigned char *iface = dev->name;
+
+	spin_lock(&ip->ioc3_lock);
+
+	if (eisr & EISR_RXOFLO)
+		printk(KERN_ERR "%s: RX overflow.\n", iface);
+	if (eisr & EISR_RXBUFOFLO)
+		printk(KERN_ERR "%s: RX buffer overflow.\n", iface);
+	if (eisr & EISR_RXMEMERR)
+		printk(KERN_ERR "%s: RX PCI error.\n", iface);
+	if (eisr & EISR_RXPARERR)
+		printk(KERN_ERR "%s: RX SSRAM parity error.\n", iface);
+	if (eisr & EISR_TXBUFUFLO)
+		printk(KERN_ERR "%s: TX buffer underflow.\n", iface);
+	if (eisr & EISR_TXMEMERR)
+		printk(KERN_ERR "%s: TX PCI error.\n", iface);
+
+	ioc3_stop(ip);
+	ioc3_init(dev);
+	ioc3_mii_init(ip);
+
+	netif_wake_queue(dev);
+
+	spin_unlock(&ip->ioc3_lock);
+}
+
+/* The interrupt handler does all of the Rx thread work and cleans up
+   after the Tx thread.  */
+static irqreturn_t ioc3_interrupt(int irq, void *_dev)
+{
+	struct net_device *dev = (struct net_device *)_dev;
+	struct ioc3_private *ip = netdev_priv(dev);
+	struct ioc3 *ioc3 = ip->regs;
+	const u32 enabled = EISR_RXTIMERINT | EISR_RXOFLO | EISR_RXBUFOFLO |
+	                    EISR_RXMEMERR | EISR_RXPARERR | EISR_TXBUFUFLO |
+	                    EISR_TXEXPLICIT | EISR_TXMEMERR;
+	u32 eisr;
+
+	eisr = ioc3_r_eisr() & enabled;
+
+	ioc3_w_eisr(eisr);
+	(void) ioc3_r_eisr();				/* Flush */
+
+	if (eisr & (EISR_RXOFLO | EISR_RXBUFOFLO | EISR_RXMEMERR |
+	            EISR_RXPARERR | EISR_TXBUFUFLO | EISR_TXMEMERR))
+		ioc3_error(dev, eisr);
+	if (eisr & EISR_RXTIMERINT)
+		ioc3_rx(dev);
+	if (eisr & EISR_TXEXPLICIT)
+		ioc3_tx(dev);
+
+	return IRQ_HANDLED;
+}
+
+static inline void ioc3_setup_duplex(struct ioc3_private *ip)
+{
+	struct ioc3 *ioc3 = ip->regs;
+
+	if (ip->mii.full_duplex) {
+		ioc3_w_etcsr(ETCSR_FD);
+		ip->emcr |= EMCR_DUPLEX;
+	} else {
+		ioc3_w_etcsr(ETCSR_HD);
+		ip->emcr &= ~EMCR_DUPLEX;
+	}
+	ioc3_w_emcr(ip->emcr);
+}
+
+static void ioc3_timer(unsigned long data)
+{
+	struct ioc3_private *ip = (struct ioc3_private *) data;
+
+	/* Print the link status if it has changed */
+	mii_check_media(&ip->mii, 1, 0);
+	ioc3_setup_duplex(ip);
+
+	ip->ioc3_timer.expires = jiffies + ((12 * HZ)/10); /* 1.2s */
+	add_timer(&ip->ioc3_timer);
+}
+
+/*
+ * Try to find a PHY.  There is no apparent relation between the MII addresses
+ * in the SGI documentation and what we find in reality, so we simply probe
+ * for the PHY.  It seems IOC3 PHYs usually live on address 31.  One of my
+ * onboard IOC3s has the special oddity that probing doesn't seem to find it
+ * yet the interface seems to work fine, so if probing fails we for now will
+ * simply default to PHY 31 instead of bailing out.
+ */
+static int ioc3_mii_init(struct ioc3_private *ip)
+{
+	struct net_device *dev = priv_netdev(ip);
+	int i, found = 0, res = 0;
+	int ioc3_phy_workaround = 1;
+	u16 word;
+
+	for (i = 0; i < 32; i++) {
+		word = ioc3_mdio_read(dev, i, MII_PHYSID1);
+
+		if (word != 0xffff && word != 0x0000) {
+			found = 1;
+			break;			/* Found a PHY		*/
+		}
+	}
+
+	if (!found) {
+		if (ioc3_phy_workaround)
+			i = 31;
+		else {
+			ip->mii.phy_id = -1;
+			res = -ENODEV;
+			goto out;
+		}
+	}
+
+	ip->mii.phy_id = i;
+
+out:
+	return res;
+}
+
+static void ioc3_mii_start(struct ioc3_private *ip)
+{
+	ip->ioc3_timer.expires = jiffies + (12 * HZ)/10;  /* 1.2 sec. */
+	ip->ioc3_timer.data = (unsigned long) ip;
+	ip->ioc3_timer.function = ioc3_timer;
+	add_timer(&ip->ioc3_timer);
+}
+
+static inline void ioc3_clean_rx_ring(struct ioc3_private *ip)
+{
+	struct sk_buff *skb;
+	int i;
+
+	for (i = ip->rx_ci; i & 15; i++) {
+		ip->rx_skbs[ip->rx_pi] = ip->rx_skbs[ip->rx_ci];
+		ip->rxr[ip->rx_pi++] = ip->rxr[ip->rx_ci++];
+	}
+	ip->rx_pi &= 511;
+	ip->rx_ci &= 511;
+
+	for (i = ip->rx_ci; i != ip->rx_pi; i = (i+1) & 511) {
+		struct ioc3_erxbuf *rxb;
+		skb = ip->rx_skbs[i];
+		rxb = (struct ioc3_erxbuf *) (skb->data - RX_OFFSET);
+		rxb->w0 = 0;
+	}
+}
+
+static inline void ioc3_clean_tx_ring(struct ioc3_private *ip)
+{
+	struct sk_buff *skb;
+	int i;
+
+	for (i=0; i < 128; i++) {
+		skb = ip->tx_skbs[i];
+		if (skb) {
+			ip->tx_skbs[i] = NULL;
+			dev_kfree_skb_any(skb);
+		}
+		ip->txr[i].cmd = 0;
+	}
+	ip->tx_pi = 0;
+	ip->tx_ci = 0;
+}
+
+static void ioc3_free_rings(struct ioc3_private *ip)
+{
+	struct sk_buff *skb;
+	int rx_entry, n_entry;
+
+	if (ip->txr) {
+		ioc3_clean_tx_ring(ip);
+		free_pages((unsigned long)ip->txr, 2);
+		ip->txr = NULL;
+	}
+
+	if (ip->rxr) {
+		n_entry = ip->rx_ci;
+		rx_entry = ip->rx_pi;
+
+		while (n_entry != rx_entry) {
+			skb = ip->rx_skbs[n_entry];
+			if (skb)
+				dev_kfree_skb_any(skb);
+
+			n_entry = (n_entry + 1) & 511;
+		}
+		free_page((unsigned long)ip->rxr);
+		ip->rxr = NULL;
+	}
+}
+
+static void ioc3_alloc_rings(struct net_device *dev)
+{
+	struct ioc3_private *ip = netdev_priv(dev);
+	struct ioc3_erxbuf *rxb;
+	unsigned long *rxr;
+	int i;
+
+	if (ip->rxr == NULL) {
+		/* Allocate and initialize rx ring.  4kb = 512 entries  */
+		ip->rxr = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
+		rxr = (unsigned long *) ip->rxr;
+		if (!rxr)
+			printk("ioc3_alloc_rings(): get_zeroed_page() failed!\n");
+
+		/* Now the rx buffers.  The RX ring may be larger but
+		   we only allocate 16 buffers for now.  Need to tune
+		   this for performance and memory later.  */
+		for (i = 0; i < RX_BUFFS; i++) {
+			struct sk_buff *skb;
+
+			skb = ioc3_alloc_skb(RX_BUF_ALLOC_SIZE, GFP_ATOMIC);
+			if (!skb) {
+				show_free_areas(0);
+				continue;
+			}
+
+			ip->rx_skbs[i] = skb;
+
+			/* Because we reserve afterwards. */
+			skb_put(skb, (1664 + RX_OFFSET));
+			rxb = (struct ioc3_erxbuf *) skb->data;
+			rxr[i] = cpu_to_be64(ioc3_map(rxb, 1));
+			skb_reserve(skb, RX_OFFSET);
+		}
+		ip->rx_ci = 0;
+		ip->rx_pi = RX_BUFFS;
+	}
+
+	if (ip->txr == NULL) {
+		/* Allocate and initialize tx rings.  16kb = 128 bufs.  */
+		ip->txr = (struct ioc3_etxd *)__get_free_pages(GFP_KERNEL, 2);
+		if (!ip->txr)
+			printk("ioc3_alloc_rings(): __get_free_pages() failed!\n");
+		ip->tx_pi = 0;
+		ip->tx_ci = 0;
+	}
+}
+
+static void ioc3_init_rings(struct net_device *dev)
+{
+	struct ioc3_private *ip = netdev_priv(dev);
+	struct ioc3 *ioc3 = ip->regs;
+	unsigned long ring;
+
+	ioc3_free_rings(ip);
+	ioc3_alloc_rings(dev);
+
+	ioc3_clean_rx_ring(ip);
+	ioc3_clean_tx_ring(ip);
+
+	/* Now the rx ring base, consume & produce registers.  */
+	ring = ioc3_map(ip->rxr, 0);
+	ioc3_w_erbr_h(ring >> 32);
+	ioc3_w_erbr_l(ring & 0xffffffff);
+	ioc3_w_ercir(ip->rx_ci << 3);
+	ioc3_w_erpir((ip->rx_pi << 3) | ERPIR_ARM);
+
+	ring = ioc3_map(ip->txr, 0);
+
+	ip->txqlen = 0;					/* nothing queued  */
+
+	/* Now the tx ring base, consume & produce registers.  */
+	ioc3_w_etbr_h(ring >> 32);
+	ioc3_w_etbr_l(ring & 0xffffffff);
+	ioc3_w_etpir(ip->tx_pi << 7);
+	ioc3_w_etcir(ip->tx_ci << 7);
+	(void) ioc3_r_etcir();				/* Flush */
+}
+
+static inline void ioc3_ssram_disc(struct ioc3_private *ip)
+{
+	struct ioc3 *ioc3 = ip->regs;
+	volatile u32 *ssram0 = &ioc3->ssram[0x0000];
+	volatile u32 *ssram1 = &ioc3->ssram[0x4000];
+	unsigned int pattern = 0x5555;
+
+	/* Assume the larger size SSRAM and enable parity checking */
+	ioc3_w_emcr(ioc3_r_emcr() | (EMCR_BUFSIZ | EMCR_RAMPAR));
+
+	*ssram0 = pattern;
+	*ssram1 = ~pattern & IOC3_SSRAM_DM;
+
+	if ((*ssram0 & IOC3_SSRAM_DM) != pattern ||
+	    (*ssram1 & IOC3_SSRAM_DM) != (~pattern & IOC3_SSRAM_DM)) {
+		/* set ssram size to 64 KB */
+		ip->emcr = EMCR_RAMPAR;
+		ioc3_w_emcr(ioc3_r_emcr() & ~EMCR_BUFSIZ);
+	} else
+		ip->emcr = EMCR_BUFSIZ | EMCR_RAMPAR;
+}
+
+static void ioc3_init(struct net_device *dev)
+{
+	struct ioc3_private *ip = netdev_priv(dev);
+	struct ioc3 *ioc3 = ip->regs;
+
+	del_timer_sync(&ip->ioc3_timer);	/* Kill if running	*/
+
+	ioc3_w_emcr(EMCR_RST);			/* Reset		*/
+	(void) ioc3_r_emcr();			/* Flush WB		*/
+	udelay(4);				/* Give it time ...	*/
+	ioc3_w_emcr(0);
+	(void) ioc3_r_emcr();
+
+	/* Misc registers  */
+#ifdef CONFIG_SGI_IP27
+	ioc3_w_erbar(PCI64_ATTR_BAR >> 32);	/* Barrier on last store */
+#else
+	ioc3_w_erbar(0);			/* Let PCI API get it right */
+#endif
+	(void) ioc3_r_etcdc();			/* Clear on read */
+	ioc3_w_ercsr(15);			/* RX low watermark  */
+	ioc3_w_ertr(0);				/* Interrupt immediately */
+	__ioc3_set_mac_address(dev);
+	ioc3_w_ehar_h(ip->ehar_h);
+	ioc3_w_ehar_l(ip->ehar_l);
+	ioc3_w_ersr(42);			/* XXX should be random */
+
+	ioc3_init_rings(dev);
+
+	ip->emcr |= ((RX_OFFSET / 2) << EMCR_RXOFF_SHIFT) | EMCR_TXDMAEN |
+	             EMCR_TXEN | EMCR_RXDMAEN | EMCR_RXEN | EMCR_PADEN;
+	ioc3_w_emcr(ip->emcr);
+	ioc3_w_eier(EISR_RXTIMERINT | EISR_RXOFLO | EISR_RXBUFOFLO |
+	            EISR_RXMEMERR | EISR_RXPARERR | EISR_TXBUFUFLO |
+	            EISR_TXEXPLICIT | EISR_TXMEMERR);
+	(void) ioc3_r_eier();
+}
+
+static inline void ioc3_stop(struct ioc3_private *ip)
+{
+	struct ioc3 *ioc3 = ip->regs;
+
+	ioc3_w_emcr(0);				/* Shutup */
+	ioc3_w_eier(0);				/* Disable interrupts */
+	(void) ioc3_r_eier();			/* Flush */
+}
+
+static int ioc3_open(struct net_device *dev)
+{
+	struct ioc3_private *ip = netdev_priv(dev);
+
+	if (request_irq(dev->irq, ioc3_interrupt, IRQF_SHARED, ioc3_str, dev)) {
+		printk(KERN_ERR "%s: Can't get irq %d\n", dev->name, dev->irq);
+
+		return -EAGAIN;
+	}
+
+	ip->ehar_h = 0;
+	ip->ehar_l = 0;
+	ioc3_init(dev);
+	ioc3_mii_start(ip);
+
+	netif_start_queue(dev);
+	return 0;
+}
+
+static int ioc3_close(struct net_device *dev)
+{
+	struct ioc3_private *ip = netdev_priv(dev);
+
+	del_timer_sync(&ip->ioc3_timer);
+
+	netif_stop_queue(dev);
+
+	ioc3_stop(ip);
+	free_irq(dev->irq, dev);
+
+	ioc3_free_rings(ip);
+	return 0;
+}
+
+/*
+ * MENET cards have four IOC3 chips, which are attached to two sets of
+ * PCI slot resources each: the primary connections are on slots
+ * 0..3 and the secondaries are on 4..7
+ *
+ * All four ethernets are brought out to connectors; six serial ports
+ * (a pair from each of the first three IOC3s) are brought out to
+ * MiniDINs; all other subdevices are left swinging in the wind, leave
+ * them disabled.
+ */
+
+static int ioc3_adjacent_is_ioc3(struct pci_dev *pdev, int slot)
+{
+	struct pci_dev *dev = pci_get_slot(pdev->bus, PCI_DEVFN(slot, 0));
+	int ret = 0;
+
+	if (dev) {
+		if (dev->vendor == PCI_VENDOR_ID_SGI &&
+			dev->device == PCI_DEVICE_ID_SGI_IOC3)
+			ret = 1;
+		pci_dev_put(dev);
+	}
+
+	return ret;
+}
+
+static int ioc3_is_menet(struct pci_dev *pdev)
+{
+	return pdev->bus->parent == NULL &&
+	       ioc3_adjacent_is_ioc3(pdev, 0) &&
+	       ioc3_adjacent_is_ioc3(pdev, 1) &&
+	       ioc3_adjacent_is_ioc3(pdev, 2);
+}
+
+#ifdef CONFIG_SERIAL_8250
+/*
+ * Note about serial ports and consoles:
+ * For console output, everyone uses the IOC3 UARTA (offset 0x178)
+ * connected to the master node (look in ip27_setup_console() and
+ * ip27prom_console_write()).
+ *
+ * For serial (/dev/ttyS0 etc), we can not have hardcoded serial port
+ * addresses on a partitioned machine. Since we currently use the ioc3
+ * serial ports, we use dynamic serial port discovery that the serial.c
+ * driver uses for pci/pnp ports (there is an entry for the SGI ioc3
+ * boards in pci_boards[]). Unfortunately, UARTA's pio address is greater
+ * than UARTB's, although UARTA on o200s has traditionally been known as
+ * port 0. So, we just use one serial port from each ioc3 (since the
+ * serial driver adds addresses to get to higher ports).
+ *
+ * The first one to do a register_console becomes the preferred console
+ * (if there is no kernel command line console= directive). /dev/console
+ * (ie 5, 1) is then "aliased" into the device number returned by the
+ * "device" routine referred to in this console structure
+ * (ip27prom_console_dev).
+ *
+ * Also look in ip27-pci.c:pci_fixup_ioc3() for some comments on working
+ * around ioc3 oddities in this respect.
+ *
+ * The IOC3 serials use a 22MHz clock rate with an additional divider which
+ * can be programmed in the SCR register if the DLAB bit is set.
+ *
+ * Register to interrupt zero because we share the interrupt with
+ * the serial driver which we don't properly support yet.
+ *
+ * Can't use UPF_IOREMAP as the whole of IOC3 resources have already been
+ * registered.
+ */
+static void __devinit ioc3_8250_register(struct ioc3_uartregs __iomem *uart)
+{
+#define COSMISC_CONSTANT 6
+
+	struct uart_port port = {
+		.irq		= 0,
+		.flags		= UPF_SKIP_TEST | UPF_BOOT_AUTOCONF,
+		.iotype		= UPIO_MEM,
+		.regshift	= 0,
+		.uartclk	= (22000000 << 1) / COSMISC_CONSTANT,
+
+		.membase	= (unsigned char __iomem *) uart,
+		.mapbase	= (unsigned long) uart,
+	};
+	unsigned char lcr;
+
+	lcr = uart->iu_lcr;
+	uart->iu_lcr = lcr | UART_LCR_DLAB;
+	uart->iu_scr = COSMISC_CONSTANT,
+	uart->iu_lcr = lcr;
+	uart->iu_lcr;
+	serial8250_register_port(&port);
+}
+
+static void __devinit ioc3_serial_probe(struct pci_dev *pdev, struct ioc3 *ioc3)
+{
+	/*
+	 * We need to recognice and treat the fourth MENET serial as it
+	 * does not have an SuperIO chip attached to it, therefore attempting
+	 * to access it will result in bus errors.  We call something an
+	 * MENET if PCI slot 0, 1, 2 and 3 of a master PCI bus all have an IOC3
+	 * in it.  This is paranoid but we want to avoid blowing up on a
+	 * showhorn PCI box that happens to have 4 IOC3 cards in it so it's
+	 * not paranoid enough ...
+	 */
+	if (ioc3_is_menet(pdev) && PCI_SLOT(pdev->devfn) == 3)
+		return;
+
+	/*
+	 * Switch IOC3 to PIO mode.  It probably already was but let's be
+	 * paranoid
+	 */
+	ioc3->gpcr_s = GPCR_UARTA_MODESEL | GPCR_UARTB_MODESEL;
+	ioc3->gpcr_s;
+	ioc3->gppr_6 = 0;
+	ioc3->gppr_6;
+	ioc3->gppr_7 = 0;
+	ioc3->gppr_7;
+	ioc3->sscr_a = ioc3->sscr_a & ~SSCR_DMA_EN;
+	ioc3->sscr_a;
+	ioc3->sscr_b = ioc3->sscr_b & ~SSCR_DMA_EN;
+	ioc3->sscr_b;
+	/* Disable all SA/B interrupts except for SA/B_INT in SIO_IEC. */
+	ioc3->sio_iec &= ~ (SIO_IR_SA_TX_MT | SIO_IR_SA_RX_FULL |
+			    SIO_IR_SA_RX_HIGH | SIO_IR_SA_RX_TIMER |
+			    SIO_IR_SA_DELTA_DCD | SIO_IR_SA_DELTA_CTS |
+			    SIO_IR_SA_TX_EXPLICIT | SIO_IR_SA_MEMERR);
+	ioc3->sio_iec |= SIO_IR_SA_INT;
+	ioc3->sscr_a = 0;
+	ioc3->sio_iec &= ~ (SIO_IR_SB_TX_MT | SIO_IR_SB_RX_FULL |
+			    SIO_IR_SB_RX_HIGH | SIO_IR_SB_RX_TIMER |
+			    SIO_IR_SB_DELTA_DCD | SIO_IR_SB_DELTA_CTS |
+			    SIO_IR_SB_TX_EXPLICIT | SIO_IR_SB_MEMERR);
+	ioc3->sio_iec |= SIO_IR_SB_INT;
+	ioc3->sscr_b = 0;
+
+	ioc3_8250_register(&ioc3->sregs.uarta);
+	ioc3_8250_register(&ioc3->sregs.uartb);
+}
+#endif
+
+static const struct net_device_ops ioc3_netdev_ops = {
+	.ndo_open		= ioc3_open,
+	.ndo_stop		= ioc3_close,
+	.ndo_start_xmit		= ioc3_start_xmit,
+	.ndo_tx_timeout		= ioc3_timeout,
+	.ndo_get_stats		= ioc3_get_stats,
+	.ndo_set_multicast_list	= ioc3_set_multicast_list,
+	.ndo_do_ioctl		= ioc3_ioctl,
+	.ndo_validate_addr	= eth_validate_addr,
+	.ndo_set_mac_address	= ioc3_set_mac_address,
+	.ndo_change_mtu		= eth_change_mtu,
+};
+
+static int __devinit ioc3_probe(struct pci_dev *pdev,
+	const struct pci_device_id *ent)
+{
+	unsigned int sw_physid1, sw_physid2;
+	struct net_device *dev = NULL;
+	struct ioc3_private *ip;
+	struct ioc3 *ioc3;
+	unsigned long ioc3_base, ioc3_size;
+	u32 vendor, model, rev;
+	int err, pci_using_dac;
+
+	/* Configure DMA attributes. */
+	err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
+	if (!err) {
+		pci_using_dac = 1;
+		err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
+		if (err < 0) {
+			printk(KERN_ERR "%s: Unable to obtain 64 bit DMA "
+			       "for consistent allocations\n", pci_name(pdev));
+			goto out;
+		}
+	} else {
+		err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
+		if (err) {
+			printk(KERN_ERR "%s: No usable DMA configuration, "
+			       "aborting.\n", pci_name(pdev));
+			goto out;
+		}
+		pci_using_dac = 0;
+	}
+
+	if (pci_enable_device(pdev))
+		return -ENODEV;
+
+	dev = alloc_etherdev(sizeof(struct ioc3_private));
+	if (!dev) {
+		err = -ENOMEM;
+		goto out_disable;
+	}
+
+	if (pci_using_dac)
+		dev->features |= NETIF_F_HIGHDMA;
+
+	err = pci_request_regions(pdev, "ioc3");
+	if (err)
+		goto out_free;
+
+	SET_NETDEV_DEV(dev, &pdev->dev);
+
+	ip = netdev_priv(dev);
+
+	dev->irq = pdev->irq;
+
+	ioc3_base = pci_resource_start(pdev, 0);
+	ioc3_size = pci_resource_len(pdev, 0);
+	ioc3 = (struct ioc3 *) ioremap(ioc3_base, ioc3_size);
+	if (!ioc3) {
+		printk(KERN_CRIT "ioc3eth(%s): ioremap failed, goodbye.\n",
+		       pci_name(pdev));
+		err = -ENOMEM;
+		goto out_res;
+	}
+	ip->regs = ioc3;
+
+#ifdef CONFIG_SERIAL_8250
+	ioc3_serial_probe(pdev, ioc3);
+#endif
+
+	spin_lock_init(&ip->ioc3_lock);
+	init_timer(&ip->ioc3_timer);
+
+	ioc3_stop(ip);
+	ioc3_init(dev);
+
+	ip->pdev = pdev;
+
+	ip->mii.phy_id_mask = 0x1f;
+	ip->mii.reg_num_mask = 0x1f;
+	ip->mii.dev = dev;
+	ip->mii.mdio_read = ioc3_mdio_read;
+	ip->mii.mdio_write = ioc3_mdio_write;
+
+	ioc3_mii_init(ip);
+
+	if (ip->mii.phy_id == -1) {
+		printk(KERN_CRIT "ioc3-eth(%s): Didn't find a PHY, goodbye.\n",
+		       pci_name(pdev));
+		err = -ENODEV;
+		goto out_stop;
+	}
+
+	ioc3_mii_start(ip);
+	ioc3_ssram_disc(ip);
+	ioc3_get_eaddr(ip);
+
+	/* The IOC3-specific entries in the device structure. */
+	dev->watchdog_timeo	= 5 * HZ;
+	dev->netdev_ops		= &ioc3_netdev_ops;
+	dev->ethtool_ops	= &ioc3_ethtool_ops;
+	dev->hw_features	= NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
+	dev->features		= NETIF_F_IP_CSUM;
+
+	sw_physid1 = ioc3_mdio_read(dev, ip->mii.phy_id, MII_PHYSID1);
+	sw_physid2 = ioc3_mdio_read(dev, ip->mii.phy_id, MII_PHYSID2);
+
+	err = register_netdev(dev);
+	if (err)
+		goto out_stop;
+
+	mii_check_media(&ip->mii, 1, 1);
+	ioc3_setup_duplex(ip);
+
+	vendor = (sw_physid1 << 12) | (sw_physid2 >> 4);
+	model  = (sw_physid2 >> 4) & 0x3f;
+	rev    = sw_physid2 & 0xf;
+	printk(KERN_INFO "%s: Using PHY %d, vendor 0x%x, model %d, "
+	       "rev %d.\n", dev->name, ip->mii.phy_id, vendor, model, rev);
+	printk(KERN_INFO "%s: IOC3 SSRAM has %d kbyte.\n", dev->name,
+	       ip->emcr & EMCR_BUFSIZ ? 128 : 64);
+
+	return 0;
+
+out_stop:
+	ioc3_stop(ip);
+	del_timer_sync(&ip->ioc3_timer);
+	ioc3_free_rings(ip);
+out_res:
+	pci_release_regions(pdev);
+out_free:
+	free_netdev(dev);
+out_disable:
+	/*
+	 * We should call pci_disable_device(pdev); here if the IOC3 wasn't
+	 * such a weird device ...
+	 */
+out:
+	return err;
+}
+
+static void __devexit ioc3_remove_one (struct pci_dev *pdev)
+{
+	struct net_device *dev = pci_get_drvdata(pdev);
+	struct ioc3_private *ip = netdev_priv(dev);
+	struct ioc3 *ioc3 = ip->regs;
+
+	unregister_netdev(dev);
+	del_timer_sync(&ip->ioc3_timer);
+
+	iounmap(ioc3);
+	pci_release_regions(pdev);
+	free_netdev(dev);
+	/*
+	 * We should call pci_disable_device(pdev); here if the IOC3 wasn't
+	 * such a weird device ...
+	 */
+}
+
+static DEFINE_PCI_DEVICE_TABLE(ioc3_pci_tbl) = {
+	{ PCI_VENDOR_ID_SGI, PCI_DEVICE_ID_SGI_IOC3, PCI_ANY_ID, PCI_ANY_ID },
+	{ 0 }
+};
+MODULE_DEVICE_TABLE(pci, ioc3_pci_tbl);
+
+static struct pci_driver ioc3_driver = {
+	.name		= "ioc3-eth",
+	.id_table	= ioc3_pci_tbl,
+	.probe		= ioc3_probe,
+	.remove		= __devexit_p(ioc3_remove_one),
+};
+
+static int __init ioc3_init_module(void)
+{
+	return pci_register_driver(&ioc3_driver);
+}
+
+static void __exit ioc3_cleanup_module(void)
+{
+	pci_unregister_driver(&ioc3_driver);
+}
+
+static int ioc3_start_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	unsigned long data;
+	struct ioc3_private *ip = netdev_priv(dev);
+	struct ioc3 *ioc3 = ip->regs;
+	unsigned int len;
+	struct ioc3_etxd *desc;
+	uint32_t w0 = 0;
+	int produce;
+
+	/*
+	 * IOC3 has a fairly simple minded checksumming hardware which simply
+	 * adds up the 1's complement checksum for the entire packet and
+	 * inserts it at an offset which can be specified in the descriptor
+	 * into the transmit packet.  This means we have to compensate for the
+	 * MAC header which should not be summed and the TCP/UDP pseudo headers
+	 * manually.
+	 */
+	if (skb->ip_summed == CHECKSUM_PARTIAL) {
+		const struct iphdr *ih = ip_hdr(skb);
+		const int proto = ntohs(ih->protocol);
+		unsigned int csoff;
+		uint32_t csum, ehsum;
+		uint16_t *eh;
+
+		/* The MAC header.  skb->mac seem the logic approach
+		   to find the MAC header - except it's a NULL pointer ...  */
+		eh = (uint16_t *) skb->data;
+
+		/* Sum up dest addr, src addr and protocol  */
+		ehsum = eh[0] + eh[1] + eh[2] + eh[3] + eh[4] + eh[5] + eh[6];
+
+		/* Fold ehsum.  can't use csum_fold which negates also ...  */
+		ehsum = (ehsum & 0xffff) + (ehsum >> 16);
+		ehsum = (ehsum & 0xffff) + (ehsum >> 16);
+
+		/* Skip IP header; it's sum is always zero and was
+		   already filled in by ip_output.c */
+		csum = csum_tcpudp_nofold(ih->saddr, ih->daddr,
+		                          ih->tot_len - (ih->ihl << 2),
+		                          proto, 0xffff ^ ehsum);
+
+		csum = (csum & 0xffff) + (csum >> 16);	/* Fold again */
+		csum = (csum & 0xffff) + (csum >> 16);
+
+		csoff = ETH_HLEN + (ih->ihl << 2);
+		if (proto == IPPROTO_UDP) {
+			csoff += offsetof(struct udphdr, check);
+			udp_hdr(skb)->check = csum;
+		}
+		if (proto == IPPROTO_TCP) {
+			csoff += offsetof(struct tcphdr, check);
+			tcp_hdr(skb)->check = csum;
+		}
+
+		w0 = ETXD_DOCHECKSUM | (csoff << ETXD_CHKOFF_SHIFT);
+	}
+
+	spin_lock_irq(&ip->ioc3_lock);
+
+	data = (unsigned long) skb->data;
+	len = skb->len;
+
+	produce = ip->tx_pi;
+	desc = &ip->txr[produce];
+
+	if (len <= 104) {
+		/* Short packet, let's copy it directly into the ring.  */
+		skb_copy_from_linear_data(skb, desc->data, skb->len);
+		if (len < ETH_ZLEN) {
+			/* Very short packet, pad with zeros at the end. */
+			memset(desc->data + len, 0, ETH_ZLEN - len);
+			len = ETH_ZLEN;
+		}
+		desc->cmd = cpu_to_be32(len | ETXD_INTWHENDONE | ETXD_D0V | w0);
+		desc->bufcnt = cpu_to_be32(len);
+	} else if ((data ^ (data + len - 1)) & 0x4000) {
+		unsigned long b2 = (data | 0x3fffUL) + 1UL;
+		unsigned long s1 = b2 - data;
+		unsigned long s2 = data + len - b2;
+
+		desc->cmd    = cpu_to_be32(len | ETXD_INTWHENDONE |
+		                           ETXD_B1V | ETXD_B2V | w0);
+		desc->bufcnt = cpu_to_be32((s1 << ETXD_B1CNT_SHIFT) |
+		                           (s2 << ETXD_B2CNT_SHIFT));
+		desc->p1     = cpu_to_be64(ioc3_map(skb->data, 1));
+		desc->p2     = cpu_to_be64(ioc3_map((void *) b2, 1));
+	} else {
+		/* Normal sized packet that doesn't cross a page boundary. */
+		desc->cmd = cpu_to_be32(len | ETXD_INTWHENDONE | ETXD_B1V | w0);
+		desc->bufcnt = cpu_to_be32(len << ETXD_B1CNT_SHIFT);
+		desc->p1     = cpu_to_be64(ioc3_map(skb->data, 1));
+	}
+
+	BARRIER();
+
+	ip->tx_skbs[produce] = skb;			/* Remember skb */
+	produce = (produce + 1) & 127;
+	ip->tx_pi = produce;
+	ioc3_w_etpir(produce << 7);			/* Fire ... */
+
+	ip->txqlen++;
+
+	if (ip->txqlen >= 127)
+		netif_stop_queue(dev);
+
+	spin_unlock_irq(&ip->ioc3_lock);
+
+	return NETDEV_TX_OK;
+}
+
+static void ioc3_timeout(struct net_device *dev)
+{
+	struct ioc3_private *ip = netdev_priv(dev);
+
+	printk(KERN_ERR "%s: transmit timed out, resetting\n", dev->name);
+
+	spin_lock_irq(&ip->ioc3_lock);
+
+	ioc3_stop(ip);
+	ioc3_init(dev);
+	ioc3_mii_init(ip);
+	ioc3_mii_start(ip);
+
+	spin_unlock_irq(&ip->ioc3_lock);
+
+	netif_wake_queue(dev);
+}
+
+/*
+ * Given a multicast ethernet address, this routine calculates the
+ * address's bit index in the logical address filter mask
+ */
+
+static inline unsigned int ioc3_hash(const unsigned char *addr)
+{
+	unsigned int temp = 0;
+	u32 crc;
+	int bits;
+
+	crc = ether_crc_le(ETH_ALEN, addr);
+
+	crc &= 0x3f;    /* bit reverse lowest 6 bits for hash index */
+	for (bits = 6; --bits >= 0; ) {
+		temp <<= 1;
+		temp |= (crc & 0x1);
+		crc >>= 1;
+	}
+
+	return temp;
+}
+
+static void ioc3_get_drvinfo (struct net_device *dev,
+	struct ethtool_drvinfo *info)
+{
+	struct ioc3_private *ip = netdev_priv(dev);
+
+        strcpy (info->driver, IOC3_NAME);
+        strcpy (info->version, IOC3_VERSION);
+        strcpy (info->bus_info, pci_name(ip->pdev));
+}
+
+static int ioc3_get_settings(struct net_device *dev, struct ethtool_cmd *cmd)
+{
+	struct ioc3_private *ip = netdev_priv(dev);
+	int rc;
+
+	spin_lock_irq(&ip->ioc3_lock);
+	rc = mii_ethtool_gset(&ip->mii, cmd);
+	spin_unlock_irq(&ip->ioc3_lock);
+
+	return rc;
+}
+
+static int ioc3_set_settings(struct net_device *dev, struct ethtool_cmd *cmd)
+{
+	struct ioc3_private *ip = netdev_priv(dev);
+	int rc;
+
+	spin_lock_irq(&ip->ioc3_lock);
+	rc = mii_ethtool_sset(&ip->mii, cmd);
+	spin_unlock_irq(&ip->ioc3_lock);
+
+	return rc;
+}
+
+static int ioc3_nway_reset(struct net_device *dev)
+{
+	struct ioc3_private *ip = netdev_priv(dev);
+	int rc;
+
+	spin_lock_irq(&ip->ioc3_lock);
+	rc = mii_nway_restart(&ip->mii);
+	spin_unlock_irq(&ip->ioc3_lock);
+
+	return rc;
+}
+
+static u32 ioc3_get_link(struct net_device *dev)
+{
+	struct ioc3_private *ip = netdev_priv(dev);
+	int rc;
+
+	spin_lock_irq(&ip->ioc3_lock);
+	rc = mii_link_ok(&ip->mii);
+	spin_unlock_irq(&ip->ioc3_lock);
+
+	return rc;
+}
+
+static const struct ethtool_ops ioc3_ethtool_ops = {
+	.get_drvinfo		= ioc3_get_drvinfo,
+	.get_settings		= ioc3_get_settings,
+	.set_settings		= ioc3_set_settings,
+	.nway_reset		= ioc3_nway_reset,
+	.get_link		= ioc3_get_link,
+};
+
+static int ioc3_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
+{
+	struct ioc3_private *ip = netdev_priv(dev);
+	int rc;
+
+	spin_lock_irq(&ip->ioc3_lock);
+	rc = generic_mii_ioctl(&ip->mii, if_mii(rq), cmd, NULL);
+	spin_unlock_irq(&ip->ioc3_lock);
+
+	return rc;
+}
+
+static void ioc3_set_multicast_list(struct net_device *dev)
+{
+	struct netdev_hw_addr *ha;
+	struct ioc3_private *ip = netdev_priv(dev);
+	struct ioc3 *ioc3 = ip->regs;
+	u64 ehar = 0;
+
+	netif_stop_queue(dev);				/* Lock out others. */
+
+	if (dev->flags & IFF_PROMISC) {			/* Set promiscuous.  */
+		ip->emcr |= EMCR_PROMISC;
+		ioc3_w_emcr(ip->emcr);
+		(void) ioc3_r_emcr();
+	} else {
+		ip->emcr &= ~EMCR_PROMISC;
+		ioc3_w_emcr(ip->emcr);			/* Clear promiscuous. */
+		(void) ioc3_r_emcr();
+
+		if ((dev->flags & IFF_ALLMULTI) ||
+		    (netdev_mc_count(dev) > 64)) {
+			/* Too many for hashing to make sense or we want all
+			   multicast packets anyway,  so skip computing all the
+			   hashes and just accept all packets.  */
+			ip->ehar_h = 0xffffffff;
+			ip->ehar_l = 0xffffffff;
+		} else {
+			netdev_for_each_mc_addr(ha, dev) {
+				ehar |= (1UL << ioc3_hash(ha->addr));
+			}
+			ip->ehar_h = ehar >> 32;
+			ip->ehar_l = ehar & 0xffffffff;
+		}
+		ioc3_w_ehar_h(ip->ehar_h);
+		ioc3_w_ehar_l(ip->ehar_l);
+	}
+
+	netif_wake_queue(dev);			/* Let us get going again. */
+}
+
+MODULE_AUTHOR("Ralf Baechle <ralf@linux-mips.org>");
+MODULE_DESCRIPTION("SGI IOC3 Ethernet driver");
+MODULE_LICENSE("GPL");
+
+module_init(ioc3_init_module);
+module_exit(ioc3_cleanup_module);
diff --git a/drivers/net/ethernet/sgi/meth.c b/drivers/net/ethernet/sgi/meth.c
new file mode 100644
index 000000000000..60135aa55802
--- /dev/null
+++ b/drivers/net/ethernet/sgi/meth.c
@@ -0,0 +1,855 @@
+/*
+ * meth.c -- O2 Builtin 10/100 Ethernet driver
+ *
+ * Copyright (C) 2001-2003 Ilya Volynets
+ *
+ *	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.
+ */
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/interrupt.h>
+
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/device.h> /* struct device, et al */
+#include <linux/netdevice.h>   /* struct device, and other headers */
+#include <linux/etherdevice.h> /* eth_type_trans */
+#include <linux/ip.h>          /* struct iphdr */
+#include <linux/tcp.h>         /* struct tcphdr */
+#include <linux/skbuff.h>
+#include <linux/mii.h>         /* MII definitions */
+
+#include <asm/ip32/mace.h>
+#include <asm/ip32/ip32_ints.h>
+
+#include <asm/io.h>
+
+#include "meth.h"
+
+#ifndef MFE_DEBUG
+#define MFE_DEBUG 0
+#endif
+
+#if MFE_DEBUG>=1
+#define DPRINTK(str,args...) printk(KERN_DEBUG "meth: %s: " str, __func__ , ## args)
+#define MFE_RX_DEBUG 2
+#else
+#define DPRINTK(str,args...)
+#define MFE_RX_DEBUG 0
+#endif
+
+
+static const char *meth_str="SGI O2 Fast Ethernet";
+
+/* The maximum time waited (in jiffies) before assuming a Tx failed. (400ms) */
+#define TX_TIMEOUT (400*HZ/1000)
+
+static int timeout = TX_TIMEOUT;
+module_param(timeout, int, 0);
+
+/*
+ * This structure is private to each device. It is used to pass
+ * packets in and out, so there is place for a packet
+ */
+struct meth_private {
+	/* in-memory copy of MAC Control register */
+	unsigned long mac_ctrl;
+	/* in-memory copy of DMA Control register */
+	unsigned long dma_ctrl;
+	/* address of PHY, used by mdio_* functions, initialized in mdio_probe */
+	unsigned long phy_addr;
+	tx_packet *tx_ring;
+	dma_addr_t tx_ring_dma;
+	struct sk_buff *tx_skbs[TX_RING_ENTRIES];
+	dma_addr_t tx_skb_dmas[TX_RING_ENTRIES];
+	unsigned long tx_read, tx_write, tx_count;
+
+	rx_packet *rx_ring[RX_RING_ENTRIES];
+	dma_addr_t rx_ring_dmas[RX_RING_ENTRIES];
+	struct sk_buff *rx_skbs[RX_RING_ENTRIES];
+	unsigned long rx_write;
+
+	spinlock_t meth_lock;
+};
+
+static void meth_tx_timeout(struct net_device *dev);
+static irqreturn_t meth_interrupt(int irq, void *dev_id);
+
+/* global, initialized in ip32-setup.c */
+char o2meth_eaddr[8]={0,0,0,0,0,0,0,0};
+
+static inline void load_eaddr(struct net_device *dev)
+{
+	int i;
+	u64 macaddr;
+
+	DPRINTK("Loading MAC Address: %pM\n", dev->dev_addr);
+	macaddr = 0;
+	for (i = 0; i < 6; i++)
+		macaddr |= (u64)dev->dev_addr[i] << ((5 - i) * 8);
+
+	mace->eth.mac_addr = macaddr;
+}
+
+/*
+ * Waits for BUSY status of mdio bus to clear
+ */
+#define WAIT_FOR_PHY(___rval)					\
+	while ((___rval = mace->eth.phy_data) & MDIO_BUSY) {	\
+		udelay(25);					\
+	}
+/*read phy register, return value read */
+static unsigned long mdio_read(struct meth_private *priv, unsigned long phyreg)
+{
+	unsigned long rval;
+	WAIT_FOR_PHY(rval);
+	mace->eth.phy_regs = (priv->phy_addr << 5) | (phyreg & 0x1f);
+	udelay(25);
+	mace->eth.phy_trans_go = 1;
+	udelay(25);
+	WAIT_FOR_PHY(rval);
+	return rval & MDIO_DATA_MASK;
+}
+
+static int mdio_probe(struct meth_private *priv)
+{
+	int i;
+	unsigned long p2, p3, flags;
+	/* check if phy is detected already */
+	if(priv->phy_addr>=0&&priv->phy_addr<32)
+		return 0;
+	spin_lock_irqsave(&priv->meth_lock, flags);
+	for (i=0;i<32;++i){
+		priv->phy_addr=i;
+		p2=mdio_read(priv,2);
+		p3=mdio_read(priv,3);
+#if MFE_DEBUG>=2
+		switch ((p2<<12)|(p3>>4)){
+		case PHY_QS6612X:
+			DPRINTK("PHY is QS6612X\n");
+			break;
+		case PHY_ICS1889:
+			DPRINTK("PHY is ICS1889\n");
+			break;
+		case PHY_ICS1890:
+			DPRINTK("PHY is ICS1890\n");
+			break;
+		case PHY_DP83840:
+			DPRINTK("PHY is DP83840\n");
+			break;
+		}
+#endif
+		if(p2!=0xffff&&p2!=0x0000){
+			DPRINTK("PHY code: %x\n",(p2<<12)|(p3>>4));
+			break;
+		}
+	}
+	spin_unlock_irqrestore(&priv->meth_lock, flags);
+	if(priv->phy_addr<32) {
+		return 0;
+	}
+	DPRINTK("Oopsie! PHY is not known!\n");
+	priv->phy_addr=-1;
+	return -ENODEV;
+}
+
+static void meth_check_link(struct net_device *dev)
+{
+	struct meth_private *priv = netdev_priv(dev);
+	unsigned long mii_advertising = mdio_read(priv, 4);
+	unsigned long mii_partner = mdio_read(priv, 5);
+	unsigned long negotiated = mii_advertising & mii_partner;
+	unsigned long duplex, speed;
+
+	if (mii_partner == 0xffff)
+		return;
+
+	speed = (negotiated & 0x0380) ? METH_100MBIT : 0;
+	duplex = ((negotiated & 0x0100) || (negotiated & 0x01C0) == 0x0040) ?
+		 METH_PHY_FDX : 0;
+
+	if ((priv->mac_ctrl & METH_PHY_FDX) ^ duplex) {
+		DPRINTK("Setting %s-duplex\n", duplex ? "full" : "half");
+		if (duplex)
+			priv->mac_ctrl |= METH_PHY_FDX;
+		else
+			priv->mac_ctrl &= ~METH_PHY_FDX;
+		mace->eth.mac_ctrl = priv->mac_ctrl;
+	}
+
+	if ((priv->mac_ctrl & METH_100MBIT) ^ speed) {
+		DPRINTK("Setting %dMbs mode\n", speed ? 100 : 10);
+		if (duplex)
+			priv->mac_ctrl |= METH_100MBIT;
+		else
+			priv->mac_ctrl &= ~METH_100MBIT;
+		mace->eth.mac_ctrl = priv->mac_ctrl;
+	}
+}
+
+
+static int meth_init_tx_ring(struct meth_private *priv)
+{
+	/* Init TX ring */
+	priv->tx_ring = dma_alloc_coherent(NULL, TX_RING_BUFFER_SIZE,
+	                                   &priv->tx_ring_dma, GFP_ATOMIC);
+	if (!priv->tx_ring)
+		return -ENOMEM;
+	memset(priv->tx_ring, 0, TX_RING_BUFFER_SIZE);
+	priv->tx_count = priv->tx_read = priv->tx_write = 0;
+	mace->eth.tx_ring_base = priv->tx_ring_dma;
+	/* Now init skb save area */
+	memset(priv->tx_skbs, 0, sizeof(priv->tx_skbs));
+	memset(priv->tx_skb_dmas, 0, sizeof(priv->tx_skb_dmas));
+	return 0;
+}
+
+static int meth_init_rx_ring(struct meth_private *priv)
+{
+	int i;
+
+	for (i = 0; i < RX_RING_ENTRIES; i++) {
+		priv->rx_skbs[i] = alloc_skb(METH_RX_BUFF_SIZE, 0);
+		/* 8byte status vector + 3quad padding + 2byte padding,
+		 * to put data on 64bit aligned boundary */
+		skb_reserve(priv->rx_skbs[i],METH_RX_HEAD);
+		priv->rx_ring[i]=(rx_packet*)(priv->rx_skbs[i]->head);
+		/* I'll need to re-sync it after each RX */
+		priv->rx_ring_dmas[i] =
+			dma_map_single(NULL, priv->rx_ring[i],
+				       METH_RX_BUFF_SIZE, DMA_FROM_DEVICE);
+		mace->eth.rx_fifo = priv->rx_ring_dmas[i];
+	}
+        priv->rx_write = 0;
+	return 0;
+}
+static void meth_free_tx_ring(struct meth_private *priv)
+{
+	int i;
+
+	/* Remove any pending skb */
+	for (i = 0; i < TX_RING_ENTRIES; i++) {
+		if (priv->tx_skbs[i])
+			dev_kfree_skb(priv->tx_skbs[i]);
+		priv->tx_skbs[i] = NULL;
+	}
+	dma_free_coherent(NULL, TX_RING_BUFFER_SIZE, priv->tx_ring,
+	                  priv->tx_ring_dma);
+}
+
+/* Presumes RX DMA engine is stopped, and RX fifo ring is reset */
+static void meth_free_rx_ring(struct meth_private *priv)
+{
+	int i;
+
+	for (i = 0; i < RX_RING_ENTRIES; i++) {
+		dma_unmap_single(NULL, priv->rx_ring_dmas[i],
+				 METH_RX_BUFF_SIZE, DMA_FROM_DEVICE);
+		priv->rx_ring[i] = 0;
+		priv->rx_ring_dmas[i] = 0;
+		kfree_skb(priv->rx_skbs[i]);
+	}
+}
+
+int meth_reset(struct net_device *dev)
+{
+	struct meth_private *priv = netdev_priv(dev);
+
+	/* Reset card */
+	mace->eth.mac_ctrl = SGI_MAC_RESET;
+	udelay(1);
+	mace->eth.mac_ctrl = 0;
+	udelay(25);
+
+	/* Load ethernet address */
+	load_eaddr(dev);
+	/* Should load some "errata", but later */
+
+	/* Check for device */
+	if (mdio_probe(priv) < 0) {
+		DPRINTK("Unable to find PHY\n");
+		return -ENODEV;
+	}
+
+	/* Initial mode: 10 | Half-duplex | Accept normal packets */
+	priv->mac_ctrl = METH_ACCEPT_MCAST | METH_DEFAULT_IPG;
+	if (dev->flags & IFF_PROMISC)
+		priv->mac_ctrl |= METH_PROMISC;
+	mace->eth.mac_ctrl = priv->mac_ctrl;
+
+	/* Autonegotiate speed and duplex mode */
+	meth_check_link(dev);
+
+	/* Now set dma control, but don't enable DMA, yet */
+	priv->dma_ctrl = (4 << METH_RX_OFFSET_SHIFT) |
+			 (RX_RING_ENTRIES << METH_RX_DEPTH_SHIFT);
+	mace->eth.dma_ctrl = priv->dma_ctrl;
+
+	return 0;
+}
+
+/*============End Helper Routines=====================*/
+
+/*
+ * Open and close
+ */
+static int meth_open(struct net_device *dev)
+{
+	struct meth_private *priv = netdev_priv(dev);
+	int ret;
+
+	priv->phy_addr = -1;    /* No PHY is known yet... */
+
+	/* Initialize the hardware */
+	ret = meth_reset(dev);
+	if (ret < 0)
+		return ret;
+
+	/* Allocate the ring buffers */
+	ret = meth_init_tx_ring(priv);
+	if (ret < 0)
+		return ret;
+	ret = meth_init_rx_ring(priv);
+	if (ret < 0)
+		goto out_free_tx_ring;
+
+	ret = request_irq(dev->irq, meth_interrupt, 0, meth_str, dev);
+	if (ret) {
+		printk(KERN_ERR "%s: Can't get irq %d\n", dev->name, dev->irq);
+		goto out_free_rx_ring;
+	}
+
+	/* Start DMA */
+	priv->dma_ctrl |= METH_DMA_TX_EN | /*METH_DMA_TX_INT_EN |*/
+			  METH_DMA_RX_EN | METH_DMA_RX_INT_EN;
+	mace->eth.dma_ctrl = priv->dma_ctrl;
+
+	DPRINTK("About to start queue\n");
+	netif_start_queue(dev);
+
+	return 0;
+
+out_free_rx_ring:
+	meth_free_rx_ring(priv);
+out_free_tx_ring:
+	meth_free_tx_ring(priv);
+
+	return ret;
+}
+
+static int meth_release(struct net_device *dev)
+{
+	struct meth_private *priv = netdev_priv(dev);
+
+	DPRINTK("Stopping queue\n");
+	netif_stop_queue(dev); /* can't transmit any more */
+	/* shut down DMA */
+	priv->dma_ctrl &= ~(METH_DMA_TX_EN | METH_DMA_TX_INT_EN |
+			    METH_DMA_RX_EN | METH_DMA_RX_INT_EN);
+	mace->eth.dma_ctrl = priv->dma_ctrl;
+	free_irq(dev->irq, dev);
+	meth_free_tx_ring(priv);
+	meth_free_rx_ring(priv);
+
+	return 0;
+}
+
+/*
+ * Receive a packet: retrieve, encapsulate and pass over to upper levels
+ */
+static void meth_rx(struct net_device* dev, unsigned long int_status)
+{
+	struct sk_buff *skb;
+	unsigned long status, flags;
+	struct meth_private *priv = netdev_priv(dev);
+	unsigned long fifo_rptr = (int_status & METH_INT_RX_RPTR_MASK) >> 8;
+
+	spin_lock_irqsave(&priv->meth_lock, flags);
+	priv->dma_ctrl &= ~METH_DMA_RX_INT_EN;
+	mace->eth.dma_ctrl = priv->dma_ctrl;
+	spin_unlock_irqrestore(&priv->meth_lock, flags);
+
+	if (int_status & METH_INT_RX_UNDERFLOW) {
+		fifo_rptr = (fifo_rptr - 1) & 0x0f;
+	}
+	while (priv->rx_write != fifo_rptr) {
+		dma_unmap_single(NULL, priv->rx_ring_dmas[priv->rx_write],
+				 METH_RX_BUFF_SIZE, DMA_FROM_DEVICE);
+		status = priv->rx_ring[priv->rx_write]->status.raw;
+#if MFE_DEBUG
+		if (!(status & METH_RX_ST_VALID)) {
+			DPRINTK("Not received? status=%016lx\n",status);
+		}
+#endif
+		if ((!(status & METH_RX_STATUS_ERRORS)) && (status & METH_RX_ST_VALID)) {
+			int len = (status & 0xffff) - 4; /* omit CRC */
+			/* length sanity check */
+			if (len < 60 || len > 1518) {
+				printk(KERN_DEBUG "%s: bogus packet size: %ld, status=%#2Lx.\n",
+				       dev->name, priv->rx_write,
+				       priv->rx_ring[priv->rx_write]->status.raw);
+				dev->stats.rx_errors++;
+				dev->stats.rx_length_errors++;
+				skb = priv->rx_skbs[priv->rx_write];
+			} else {
+				skb = alloc_skb(METH_RX_BUFF_SIZE, GFP_ATOMIC);
+				if (!skb) {
+					/* Ouch! No memory! Drop packet on the floor */
+					DPRINTK("No mem: dropping packet\n");
+					dev->stats.rx_dropped++;
+					skb = priv->rx_skbs[priv->rx_write];
+				} else {
+					struct sk_buff *skb_c = priv->rx_skbs[priv->rx_write];
+					/* 8byte status vector + 3quad padding + 2byte padding,
+					 * to put data on 64bit aligned boundary */
+					skb_reserve(skb, METH_RX_HEAD);
+					/* Write metadata, and then pass to the receive level */
+					skb_put(skb_c, len);
+					priv->rx_skbs[priv->rx_write] = skb;
+					skb_c->protocol = eth_type_trans(skb_c, dev);
+					dev->stats.rx_packets++;
+					dev->stats.rx_bytes += len;
+					netif_rx(skb_c);
+				}
+			}
+		} else {
+			dev->stats.rx_errors++;
+			skb=priv->rx_skbs[priv->rx_write];
+#if MFE_DEBUG>0
+			printk(KERN_WARNING "meth: RX error: status=0x%016lx\n",status);
+			if(status&METH_RX_ST_RCV_CODE_VIOLATION)
+				printk(KERN_WARNING "Receive Code Violation\n");
+			if(status&METH_RX_ST_CRC_ERR)
+				printk(KERN_WARNING "CRC error\n");
+			if(status&METH_RX_ST_INV_PREAMBLE_CTX)
+				printk(KERN_WARNING "Invalid Preamble Context\n");
+			if(status&METH_RX_ST_LONG_EVT_SEEN)
+				printk(KERN_WARNING "Long Event Seen...\n");
+			if(status&METH_RX_ST_BAD_PACKET)
+				printk(KERN_WARNING "Bad Packet\n");
+			if(status&METH_RX_ST_CARRIER_EVT_SEEN)
+				printk(KERN_WARNING "Carrier Event Seen\n");
+#endif
+		}
+		priv->rx_ring[priv->rx_write] = (rx_packet*)skb->head;
+		priv->rx_ring[priv->rx_write]->status.raw = 0;
+		priv->rx_ring_dmas[priv->rx_write] =
+			dma_map_single(NULL, priv->rx_ring[priv->rx_write],
+				       METH_RX_BUFF_SIZE, DMA_FROM_DEVICE);
+		mace->eth.rx_fifo = priv->rx_ring_dmas[priv->rx_write];
+		ADVANCE_RX_PTR(priv->rx_write);
+	}
+	spin_lock_irqsave(&priv->meth_lock, flags);
+	/* In case there was underflow, and Rx DMA was disabled */
+	priv->dma_ctrl |= METH_DMA_RX_INT_EN | METH_DMA_RX_EN;
+	mace->eth.dma_ctrl = priv->dma_ctrl;
+	mace->eth.int_stat = METH_INT_RX_THRESHOLD;
+	spin_unlock_irqrestore(&priv->meth_lock, flags);
+}
+
+static int meth_tx_full(struct net_device *dev)
+{
+	struct meth_private *priv = netdev_priv(dev);
+
+	return priv->tx_count >= TX_RING_ENTRIES - 1;
+}
+
+static void meth_tx_cleanup(struct net_device* dev, unsigned long int_status)
+{
+	struct meth_private *priv = netdev_priv(dev);
+	unsigned long status, flags;
+	struct sk_buff *skb;
+	unsigned long rptr = (int_status&TX_INFO_RPTR) >> 16;
+
+	spin_lock_irqsave(&priv->meth_lock, flags);
+
+	/* Stop DMA notification */
+	priv->dma_ctrl &= ~(METH_DMA_TX_INT_EN);
+	mace->eth.dma_ctrl = priv->dma_ctrl;
+
+	while (priv->tx_read != rptr) {
+		skb = priv->tx_skbs[priv->tx_read];
+		status = priv->tx_ring[priv->tx_read].header.raw;
+#if MFE_DEBUG>=1
+		if (priv->tx_read == priv->tx_write)
+			DPRINTK("Auchi! tx_read=%d,tx_write=%d,rptr=%d?\n", priv->tx_read, priv->tx_write,rptr);
+#endif
+		if (status & METH_TX_ST_DONE) {
+			if (status & METH_TX_ST_SUCCESS){
+				dev->stats.tx_packets++;
+				dev->stats.tx_bytes += skb->len;
+			} else {
+				dev->stats.tx_errors++;
+#if MFE_DEBUG>=1
+				DPRINTK("TX error: status=%016lx <",status);
+				if(status & METH_TX_ST_SUCCESS)
+					printk(" SUCCESS");
+				if(status & METH_TX_ST_TOOLONG)
+					printk(" TOOLONG");
+				if(status & METH_TX_ST_UNDERRUN)
+					printk(" UNDERRUN");
+				if(status & METH_TX_ST_EXCCOLL)
+					printk(" EXCCOLL");
+				if(status & METH_TX_ST_DEFER)
+					printk(" DEFER");
+				if(status & METH_TX_ST_LATECOLL)
+					printk(" LATECOLL");
+				printk(" >\n");
+#endif
+			}
+		} else {
+			DPRINTK("RPTR points us here, but packet not done?\n");
+			break;
+		}
+		dev_kfree_skb_irq(skb);
+		priv->tx_skbs[priv->tx_read] = NULL;
+		priv->tx_ring[priv->tx_read].header.raw = 0;
+		priv->tx_read = (priv->tx_read+1)&(TX_RING_ENTRIES-1);
+		priv->tx_count--;
+	}
+
+	/* wake up queue if it was stopped */
+	if (netif_queue_stopped(dev) && !meth_tx_full(dev)) {
+		netif_wake_queue(dev);
+	}
+
+	mace->eth.int_stat = METH_INT_TX_EMPTY | METH_INT_TX_PKT;
+	spin_unlock_irqrestore(&priv->meth_lock, flags);
+}
+
+static void meth_error(struct net_device* dev, unsigned status)
+{
+	struct meth_private *priv = netdev_priv(dev);
+	unsigned long flags;
+
+	printk(KERN_WARNING "meth: error status: 0x%08x\n",status);
+	/* check for errors too... */
+	if (status & (METH_INT_TX_LINK_FAIL))
+		printk(KERN_WARNING "meth: link failure\n");
+	/* Should I do full reset in this case? */
+	if (status & (METH_INT_MEM_ERROR))
+		printk(KERN_WARNING "meth: memory error\n");
+	if (status & (METH_INT_TX_ABORT))
+		printk(KERN_WARNING "meth: aborted\n");
+	if (status & (METH_INT_RX_OVERFLOW))
+		printk(KERN_WARNING "meth: Rx overflow\n");
+	if (status & (METH_INT_RX_UNDERFLOW)) {
+		printk(KERN_WARNING "meth: Rx underflow\n");
+		spin_lock_irqsave(&priv->meth_lock, flags);
+		mace->eth.int_stat = METH_INT_RX_UNDERFLOW;
+		/* more underflow interrupts will be delivered,
+		 * effectively throwing us into an infinite loop.
+		 *  Thus I stop processing Rx in this case. */
+		priv->dma_ctrl &= ~METH_DMA_RX_EN;
+		mace->eth.dma_ctrl = priv->dma_ctrl;
+		DPRINTK("Disabled meth Rx DMA temporarily\n");
+		spin_unlock_irqrestore(&priv->meth_lock, flags);
+	}
+	mace->eth.int_stat = METH_INT_ERROR;
+}
+
+/*
+ * The typical interrupt entry point
+ */
+static irqreturn_t meth_interrupt(int irq, void *dev_id)
+{
+	struct net_device *dev = (struct net_device *)dev_id;
+	struct meth_private *priv = netdev_priv(dev);
+	unsigned long status;
+
+	status = mace->eth.int_stat;
+	while (status & 0xff) {
+		/* First handle errors - if we get Rx underflow,
+		 * Rx DMA will be disabled, and Rx handler will reenable
+		 * it. I don't think it's possible to get Rx underflow,
+		 * without getting Rx interrupt */
+		if (status & METH_INT_ERROR) {
+			meth_error(dev, status);
+		}
+		if (status & (METH_INT_TX_EMPTY | METH_INT_TX_PKT)) {
+			/* a transmission is over: free the skb */
+			meth_tx_cleanup(dev, status);
+		}
+		if (status & METH_INT_RX_THRESHOLD) {
+			if (!(priv->dma_ctrl & METH_DMA_RX_INT_EN))
+				break;
+			/* send it to meth_rx for handling */
+			meth_rx(dev, status);
+		}
+		status = mace->eth.int_stat;
+	}
+
+	return IRQ_HANDLED;
+}
+
+/*
+ * Transmits packets that fit into TX descriptor (are <=120B)
+ */
+static void meth_tx_short_prepare(struct meth_private *priv,
+				  struct sk_buff *skb)
+{
+	tx_packet *desc = &priv->tx_ring[priv->tx_write];
+	int len = (skb->len < ETH_ZLEN) ? ETH_ZLEN : skb->len;
+
+	desc->header.raw = METH_TX_CMD_INT_EN | (len-1) | ((128-len) << 16);
+	/* maybe I should set whole thing to 0 first... */
+	skb_copy_from_linear_data(skb, desc->data.dt + (120 - len), skb->len);
+	if (skb->len < len)
+		memset(desc->data.dt + 120 - len + skb->len, 0, len-skb->len);
+}
+#define TX_CATBUF1 BIT(25)
+static void meth_tx_1page_prepare(struct meth_private *priv,
+				  struct sk_buff *skb)
+{
+	tx_packet *desc = &priv->tx_ring[priv->tx_write];
+	void *buffer_data = (void *)(((unsigned long)skb->data + 7) & ~7);
+	int unaligned_len = (int)((unsigned long)buffer_data - (unsigned long)skb->data);
+	int buffer_len = skb->len - unaligned_len;
+	dma_addr_t catbuf;
+
+	desc->header.raw = METH_TX_CMD_INT_EN | TX_CATBUF1 | (skb->len - 1);
+
+	/* unaligned part */
+	if (unaligned_len) {
+		skb_copy_from_linear_data(skb, desc->data.dt + (120 - unaligned_len),
+			      unaligned_len);
+		desc->header.raw |= (128 - unaligned_len) << 16;
+	}
+
+	/* first page */
+	catbuf = dma_map_single(NULL, buffer_data, buffer_len,
+				DMA_TO_DEVICE);
+	desc->data.cat_buf[0].form.start_addr = catbuf >> 3;
+	desc->data.cat_buf[0].form.len = buffer_len - 1;
+}
+#define TX_CATBUF2 BIT(26)
+static void meth_tx_2page_prepare(struct meth_private *priv,
+				  struct sk_buff *skb)
+{
+	tx_packet *desc = &priv->tx_ring[priv->tx_write];
+	void *buffer1_data = (void *)(((unsigned long)skb->data + 7) & ~7);
+	void *buffer2_data = (void *)PAGE_ALIGN((unsigned long)skb->data);
+	int unaligned_len = (int)((unsigned long)buffer1_data - (unsigned long)skb->data);
+	int buffer1_len = (int)((unsigned long)buffer2_data - (unsigned long)buffer1_data);
+	int buffer2_len = skb->len - buffer1_len - unaligned_len;
+	dma_addr_t catbuf1, catbuf2;
+
+	desc->header.raw = METH_TX_CMD_INT_EN | TX_CATBUF1 | TX_CATBUF2| (skb->len - 1);
+	/* unaligned part */
+	if (unaligned_len){
+		skb_copy_from_linear_data(skb, desc->data.dt + (120 - unaligned_len),
+			      unaligned_len);
+		desc->header.raw |= (128 - unaligned_len) << 16;
+	}
+
+	/* first page */
+	catbuf1 = dma_map_single(NULL, buffer1_data, buffer1_len,
+				 DMA_TO_DEVICE);
+	desc->data.cat_buf[0].form.start_addr = catbuf1 >> 3;
+	desc->data.cat_buf[0].form.len = buffer1_len - 1;
+	/* second page */
+	catbuf2 = dma_map_single(NULL, buffer2_data, buffer2_len,
+				 DMA_TO_DEVICE);
+	desc->data.cat_buf[1].form.start_addr = catbuf2 >> 3;
+	desc->data.cat_buf[1].form.len = buffer2_len - 1;
+}
+
+static void meth_add_to_tx_ring(struct meth_private *priv, struct sk_buff *skb)
+{
+	/* Remember the skb, so we can free it at interrupt time */
+	priv->tx_skbs[priv->tx_write] = skb;
+	if (skb->len <= 120) {
+		/* Whole packet fits into descriptor */
+		meth_tx_short_prepare(priv, skb);
+	} else if (PAGE_ALIGN((unsigned long)skb->data) !=
+		   PAGE_ALIGN((unsigned long)skb->data + skb->len - 1)) {
+		/* Packet crosses page boundary */
+		meth_tx_2page_prepare(priv, skb);
+	} else {
+		/* Packet is in one page */
+		meth_tx_1page_prepare(priv, skb);
+	}
+	priv->tx_write = (priv->tx_write + 1) & (TX_RING_ENTRIES - 1);
+	mace->eth.tx_info = priv->tx_write;
+	priv->tx_count++;
+}
+
+/*
+ * Transmit a packet (called by the kernel)
+ */
+static int meth_tx(struct sk_buff *skb, struct net_device *dev)
+{
+	struct meth_private *priv = netdev_priv(dev);
+	unsigned long flags;
+
+	spin_lock_irqsave(&priv->meth_lock, flags);
+	/* Stop DMA notification */
+	priv->dma_ctrl &= ~(METH_DMA_TX_INT_EN);
+	mace->eth.dma_ctrl = priv->dma_ctrl;
+
+	meth_add_to_tx_ring(priv, skb);
+	dev->trans_start = jiffies; /* save the timestamp */
+
+	/* If TX ring is full, tell the upper layer to stop sending packets */
+	if (meth_tx_full(dev)) {
+	        printk(KERN_DEBUG "TX full: stopping\n");
+		netif_stop_queue(dev);
+	}
+
+	/* Restart DMA notification */
+	priv->dma_ctrl |= METH_DMA_TX_INT_EN;
+	mace->eth.dma_ctrl = priv->dma_ctrl;
+
+	spin_unlock_irqrestore(&priv->meth_lock, flags);
+
+	return NETDEV_TX_OK;
+}
+
+/*
+ * Deal with a transmit timeout.
+ */
+static void meth_tx_timeout(struct net_device *dev)
+{
+	struct meth_private *priv = netdev_priv(dev);
+	unsigned long flags;
+
+	printk(KERN_WARNING "%s: transmit timed out\n", dev->name);
+
+	/* Protect against concurrent rx interrupts */
+	spin_lock_irqsave(&priv->meth_lock,flags);
+
+	/* Try to reset the interface. */
+	meth_reset(dev);
+
+	dev->stats.tx_errors++;
+
+	/* Clear all rings */
+	meth_free_tx_ring(priv);
+	meth_free_rx_ring(priv);
+	meth_init_tx_ring(priv);
+	meth_init_rx_ring(priv);
+
+	/* Restart dma */
+	priv->dma_ctrl |= METH_DMA_TX_EN | METH_DMA_RX_EN | METH_DMA_RX_INT_EN;
+	mace->eth.dma_ctrl = priv->dma_ctrl;
+
+	/* Enable interrupt */
+	spin_unlock_irqrestore(&priv->meth_lock, flags);
+
+	dev->trans_start = jiffies; /* prevent tx timeout */
+	netif_wake_queue(dev);
+}
+
+/*
+ * Ioctl commands
+ */
+static int meth_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
+{
+	/* XXX Not yet implemented */
+	switch(cmd) {
+	case SIOCGMIIPHY:
+	case SIOCGMIIREG:
+	case SIOCSMIIREG:
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
+static const struct net_device_ops meth_netdev_ops = {
+	.ndo_open		= meth_open,
+	.ndo_stop		= meth_release,
+	.ndo_start_xmit		= meth_tx,
+	.ndo_do_ioctl		= meth_ioctl,
+	.ndo_tx_timeout		= meth_tx_timeout,
+	.ndo_change_mtu		= eth_change_mtu,
+	.ndo_validate_addr	= eth_validate_addr,
+	.ndo_set_mac_address	= eth_mac_addr,
+};
+
+/*
+ * The init function.
+ */
+static int __devinit meth_probe(struct platform_device *pdev)
+{
+	struct net_device *dev;
+	struct meth_private *priv;
+	int err;
+
+	dev = alloc_etherdev(sizeof(struct meth_private));
+	if (!dev)
+		return -ENOMEM;
+
+	dev->netdev_ops		= &meth_netdev_ops;
+	dev->watchdog_timeo	= timeout;
+	dev->irq		= MACE_ETHERNET_IRQ;
+	dev->base_addr		= (unsigned long)&mace->eth;
+	memcpy(dev->dev_addr, o2meth_eaddr, 6);
+
+	priv = netdev_priv(dev);
+	spin_lock_init(&priv->meth_lock);
+	SET_NETDEV_DEV(dev, &pdev->dev);
+
+	err = register_netdev(dev);
+	if (err) {
+		free_netdev(dev);
+		return err;
+	}
+
+	printk(KERN_INFO "%s: SGI MACE Ethernet rev. %d\n",
+	       dev->name, (unsigned int)(mace->eth.mac_ctrl >> 29));
+	return 0;
+}
+
+static int __exit meth_remove(struct platform_device *pdev)
+{
+	struct net_device *dev = platform_get_drvdata(pdev);
+
+	unregister_netdev(dev);
+	free_netdev(dev);
+	platform_set_drvdata(pdev, NULL);
+
+	return 0;
+}
+
+static struct platform_driver meth_driver = {
+	.probe	= meth_probe,
+	.remove	= __exit_p(meth_remove),
+	.driver = {
+		.name	= "meth",
+		.owner	= THIS_MODULE,
+	}
+};
+
+static int __init meth_init_module(void)
+{
+	int err;
+
+	err = platform_driver_register(&meth_driver);
+	if (err)
+		printk(KERN_ERR "Driver registration failed\n");
+
+	return err;
+}
+
+static void __exit meth_exit_module(void)
+{
+	platform_driver_unregister(&meth_driver);
+}
+
+module_init(meth_init_module);
+module_exit(meth_exit_module);
+
+MODULE_AUTHOR("Ilya Volynets <ilya@theIlya.com>");
+MODULE_DESCRIPTION("SGI O2 Builtin Fast Ethernet driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:meth");
diff --git a/drivers/net/ethernet/sgi/meth.h b/drivers/net/ethernet/sgi/meth.h
new file mode 100644
index 000000000000..5b145c6bad60
--- /dev/null
+++ b/drivers/net/ethernet/sgi/meth.h
@@ -0,0 +1,243 @@
+
+/*
+ * snull.h -- definitions for the network module
+ *
+ * Copyright (C) 2001 Alessandro Rubini and Jonathan Corbet
+ * Copyright (C) 2001 O'Reilly & Associates
+ *
+ * The source code in this file can be freely used, adapted,
+ * and redistributed in source or binary form, so long as an
+ * acknowledgment appears in derived source files.  The citation
+ * should list that the code comes from the book "Linux Device
+ * Drivers" by Alessandro Rubini and Jonathan Corbet, published
+ * by O'Reilly & Associates.   No warranty is attached;
+ * we cannot take responsibility for errors or fitness for use.
+ */
+
+/* version dependencies have been confined to a separate file */
+
+/* Tunable parameters */
+#define TX_RING_ENTRIES 64	/* 64-512?*/
+
+#define RX_RING_ENTRIES 16 /* Do not change */
+/* Internal constants */
+#define TX_RING_BUFFER_SIZE	(TX_RING_ENTRIES*sizeof(tx_packet))
+#define RX_BUFFER_SIZE 1546 /* ethenet packet size */
+#define METH_RX_BUFF_SIZE 4096
+#define METH_RX_HEAD 34 /* status + 3 quad garbage-fill + 2 byte zero-pad */
+#define RX_BUFFER_OFFSET (sizeof(rx_status_vector)+2) /* staus vector + 2 bytes of padding */
+#define RX_BUCKET_SIZE 256
+
+/* For more detailed explanations of what each field menas,
+   see Nick's great comments to #defines below (or docs, if
+   you are lucky enough toget hold of them :)*/
+
+/* tx status vector is written over tx command header upon
+   dma completion. */
+
+typedef struct tx_status_vector {
+	u64		sent:1; /* always set to 1...*/
+	u64		pad0:34;/* always set to 0 */
+	u64		flags:9;			/*I'm too lazy to specify each one separately at the moment*/
+	u64		col_retry_cnt:4;	/*collision retry count*/
+	u64		len:16;				/*Transmit length in bytes*/
+} tx_status_vector;
+
+/*
+ * Each packet is 128 bytes long.
+ * It consists of header, 0-3 concatination
+ * buffer pointers and up to 120 data bytes.
+ */
+typedef struct tx_packet_hdr {
+	u64		pad1:36; /*should be filled with 0 */
+	u64		cat_ptr3_valid:1,	/*Concatination pointer valid flags*/
+			cat_ptr2_valid:1,
+			cat_ptr1_valid:1;
+	u64		tx_int_flag:1;		/*Generate TX intrrupt when packet has been sent*/
+	u64		term_dma_flag:1;	/*Terminate transmit DMA on transmit abort conditions*/
+	u64		data_offset:7;		/*Starting byte offset in ring data block*/
+	u64		data_len:16;		/*Length of valid data in bytes-1*/
+} tx_packet_hdr;
+typedef union tx_cat_ptr {
+	struct {
+		u64		pad2:16; /* should be 0 */
+		u64		len:16;				/*length of buffer data - 1*/
+		u64		start_addr:29;		/*Physical starting address*/
+		u64		pad1:3; /* should be zero */
+	} form;
+	u64 raw;
+} tx_cat_ptr;
+
+typedef struct tx_packet {
+	union {
+		tx_packet_hdr header;
+		tx_status_vector res;
+		u64 raw;
+	}header;
+	union {
+		tx_cat_ptr cat_buf[3];
+		char dt[120];
+	} data;
+} tx_packet;
+
+typedef union rx_status_vector {
+	volatile struct {
+		u64		pad1:1;/*fill it with ones*/
+		u64		pad2:15;/*fill with 0*/
+		u64		ip_chk_sum:16;
+		u64		seq_num:5;
+		u64		mac_addr_match:1;
+		u64		mcast_addr_match:1;
+		u64		carrier_event_seen:1;
+		u64		bad_packet:1;
+		u64		long_event_seen:1;
+		u64		invalid_preamble:1;
+		u64		broadcast:1;
+		u64		multicast:1;
+		u64		crc_error:1;
+		u64		huh:1;/*???*/
+		u64		rx_code_violation:1;
+		u64		rx_len:16;
+	} parsed;
+	volatile u64 raw;
+} rx_status_vector;
+
+typedef struct rx_packet {
+	rx_status_vector status;
+        u64 pad[3]; /* For whatever reason, there needs to be 4 double-word offset */
+        u16 pad2;
+	char buf[METH_RX_BUFF_SIZE-sizeof(rx_status_vector)-3*sizeof(u64)-sizeof(u16)];/* data */
+} rx_packet;
+
+#define TX_INFO_RPTR    0x00FF0000
+#define TX_INFO_WPTR    0x000000FF
+
+	/* Bits in METH_MAC */
+
+#define SGI_MAC_RESET		BIT(0)	/* 0: MAC110 active in run mode, 1: Global reset signal to MAC110 core is active */
+#define METH_PHY_FDX		BIT(1) /* 0: Disable full duplex, 1: Enable full duplex */
+#define METH_PHY_LOOP	BIT(2) /* 0: Normal operation, follows 10/100mbit and M10T/MII select, 1: loops internal MII bus */
+				       /*    selects ignored */
+#define METH_100MBIT		BIT(3) /* 0: 10meg mode, 1: 100meg mode */
+#define METH_PHY_MII		BIT(4) /* 0: MII selected, 1: SIA selected */
+				       /*   Note: when loopback is set this bit becomes collision control.  Setting this bit will */
+				       /*         cause a collision to be reported. */
+
+				       /* Bits 5 and 6 are used to determine the Destination address filter mode */
+#define METH_ACCEPT_MY 0			/* 00: Accept PHY address only */
+#define METH_ACCEPT_MCAST 0x20	/* 01: Accept physical, broadcast, and multicast filter matches only */
+#define METH_ACCEPT_AMCAST 0x40	/* 10: Accept physical, broadcast, and all multicast packets */
+#define METH_PROMISC 0x60		/* 11: Promiscious mode */
+
+#define METH_PHY_LINK_FAIL	BIT(7) /* 0: Link failure detection disabled, 1: Hardware scans for link failure in PHY */
+
+#define METH_MAC_IPG	0x1ffff00
+
+#define METH_DEFAULT_IPG ((17<<15) | (11<<22) | (21<<8))
+						/* 0x172e5c00 */ /* 23, 23, 23 */ /*0x54A9500 *//*21,21,21*/
+				       /* Bits 8 through 14 are used to determine Inter-Packet Gap between "Back to Back" packets */
+				       /* The gap depends on the clock speed of the link, 80ns per increment for 100baseT, 800ns  */
+				       /* per increment for 10BaseT */
+
+				       /* Bits 15 through 21 are used to determine IPGR1 */
+
+				       /* Bits 22 through 28 are used to determine IPGR2 */
+
+#define METH_REV_SHIFT 29       /* Bits 29 through 31 are used to determine the revision */
+				       /* 000: Initial revision */
+				       /* 001: First revision, Improved TX concatenation */
+
+
+/* DMA control bits */
+#define METH_RX_OFFSET_SHIFT 12 /* Bits 12:14 of DMA control register indicate starting offset of packet data for RX operation */
+#define METH_RX_DEPTH_SHIFT 4 /* Bits 8:4 define RX fifo depth -- when # of RX fifo entries != depth, interrupt is generted */
+
+#define METH_DMA_TX_EN BIT(1) /* enable TX DMA */
+#define METH_DMA_TX_INT_EN BIT(0) /* enable TX Buffer Empty interrupt */
+#define METH_DMA_RX_EN BIT(15) /* Enable RX */
+#define METH_DMA_RX_INT_EN BIT(9) /* Enable interrupt on RX packet */
+
+/* RX FIFO MCL Info bits */
+#define METH_RX_FIFO_WPTR(x)   (((x)>>16)&0xf)
+#define METH_RX_FIFO_RPTR(x)   (((x)>>8)&0xf)
+#define METH_RX_FIFO_DEPTH(x)  ((x)&0x1f)
+
+/* RX status bits */
+
+#define METH_RX_ST_VALID BIT(63)
+#define METH_RX_ST_RCV_CODE_VIOLATION BIT(16)
+#define METH_RX_ST_DRBL_NBL BIT(17)
+#define METH_RX_ST_CRC_ERR BIT(18)
+#define METH_RX_ST_MCAST_PKT BIT(19)
+#define METH_RX_ST_BCAST_PKT BIT(20)
+#define METH_RX_ST_INV_PREAMBLE_CTX BIT(21)
+#define METH_RX_ST_LONG_EVT_SEEN BIT(22)
+#define METH_RX_ST_BAD_PACKET BIT(23)
+#define METH_RX_ST_CARRIER_EVT_SEEN BIT(24)
+#define METH_RX_ST_MCAST_FILTER_MATCH BIT(25)
+#define METH_RX_ST_PHYS_ADDR_MATCH BIT(26)
+
+#define METH_RX_STATUS_ERRORS \
+	( \
+	METH_RX_ST_RCV_CODE_VIOLATION| \
+	METH_RX_ST_CRC_ERR| \
+	METH_RX_ST_INV_PREAMBLE_CTX| \
+	METH_RX_ST_LONG_EVT_SEEN| \
+	METH_RX_ST_BAD_PACKET| \
+	METH_RX_ST_CARRIER_EVT_SEEN \
+	)
+	/* Bits in METH_INT */
+	/* Write _1_ to corresponding bit to clear */
+#define METH_INT_TX_EMPTY	BIT(0)	/* 0: No interrupt pending, 1: The TX ring buffer is empty */
+#define METH_INT_TX_PKT		BIT(1)	/* 0: No interrupt pending */
+					      	/* 1: A TX message had the INT request bit set, the packet has been sent. */
+#define METH_INT_TX_LINK_FAIL	BIT(2)	/* 0: No interrupt pending, 1: PHY has reported a link failure */
+#define METH_INT_MEM_ERROR	BIT(3)	/* 0: No interrupt pending */
+						/* 1: A memory error occurred during DMA, DMA stopped, Fatal */
+#define METH_INT_TX_ABORT		BIT(4)	/* 0: No interrupt pending, 1: The TX aborted operation, DMA stopped, FATAL */
+#define METH_INT_RX_THRESHOLD	BIT(5)	/* 0: No interrupt pending, 1: Selected receive threshold condition Valid */
+#define METH_INT_RX_UNDERFLOW	BIT(6)	/* 0: No interrupt pending, 1: FIFO was empty, packet could not be queued */
+#define METH_INT_RX_OVERFLOW		BIT(7)	/* 0: No interrupt pending, 1: DMA FIFO Overflow, DMA stopped, FATAL */
+
+/*#define METH_INT_RX_RPTR_MASK 0x0001F00*/		/* Bits 8 through 12 alias of RX read-pointer */
+#define METH_INT_RX_RPTR_MASK 0x0000F00		/* Bits 8 through 11 alias of RX read-pointer - so, is Rx FIFO 16 or 32 entry?*/
+
+						/* Bits 13 through 15 are always 0. */
+
+#define METH_INT_TX_RPTR_MASK	0x1FF0000        /* Bits 16 through 24 alias of TX read-pointer */
+
+#define METH_INT_RX_SEQ_MASK	0x2E000000	/* Bits 25 through 29 are the starting seq number for the message at the */
+
+						/* top of the queue */
+
+#define METH_INT_ERROR	(METH_INT_TX_LINK_FAIL| \
+			METH_INT_MEM_ERROR| \
+			METH_INT_TX_ABORT| \
+			METH_INT_RX_OVERFLOW| \
+			METH_INT_RX_UNDERFLOW)
+
+#define METH_INT_MCAST_HASH		BIT(30) /* If RX DMA is enabled the hash select logic output is latched here */
+
+/* TX status bits */
+#define METH_TX_ST_DONE      BIT(63) /* TX complete */
+#define METH_TX_ST_SUCCESS   BIT(23) /* Packet was transmitted successfully */
+#define METH_TX_ST_TOOLONG   BIT(24) /* TX abort due to excessive length */
+#define METH_TX_ST_UNDERRUN  BIT(25) /* TX abort due to underrun (?) */
+#define METH_TX_ST_EXCCOLL   BIT(26) /* TX abort due to excess collisions */
+#define METH_TX_ST_DEFER     BIT(27) /* TX abort due to excess deferals */
+#define METH_TX_ST_LATECOLL  BIT(28) /* TX abort due to late collision */
+
+
+/* Tx command header bits */
+#define METH_TX_CMD_INT_EN BIT(24) /* Generate TX interrupt when packet is sent */
+
+/* Phy MDIO interface busy flag */
+#define MDIO_BUSY    BIT(16)
+#define MDIO_DATA_MASK 0xFFFF
+/* PHY defines */
+#define PHY_QS6612X    0x0181441    /* Quality TX */
+#define PHY_ICS1889    0x0015F41    /* ICS FX */
+#define PHY_ICS1890    0x0015F42    /* ICS TX */
+#define PHY_DP83840    0x20005C0    /* National TX */
+
+#define ADVANCE_RX_PTR(x)  x=(x+1)&(RX_RING_ENTRIES-1)