Merge branch 'master' into for-next

Sync with Linus tree to have 157550ff ("mtd: add GPMI-NAND driver
in the config and Makefile") as I have patch depending on that one.

1 files changed, 2690 insertions, 0 deletions

diff --git a/drivers/net/ethernet/broadcom/sb1250-mac.c b/drivers/net/ethernet/broadcom/sb1250-mac.c
new file mode 100644
index 00000000000..0a1d7f279fc
--- /dev/null
+++ b/drivers/net/ethernet/broadcom/sb1250-mac.c
@@ -0,0 +1,2690 @@
+/*
+ * Copyright (C) 2001,2002,2003,2004 Broadcom Corporation
+ * Copyright (c) 2006, 2007  Maciej W. Rozycki
+ *
+ * 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 designed for the Broadcom SiByte SOC built-in
+ * Ethernet controllers. Written by Mitch Lichtenberg at Broadcom Corp.
+ *
+ * Updated to the driver model and the PHY abstraction layer
+ * by Maciej W. Rozycki.
+ */
+
+#include <linux/bug.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/errno.h>
+#include <linux/ioport.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/init.h>
+#include <linux/bitops.h>
+#include <linux/err.h>
+#include <linux/ethtool.h>
+#include <linux/mii.h>
+#include <linux/phy.h>
+#include <linux/platform_device.h>
+#include <linux/prefetch.h>
+
+#include <asm/cache.h>
+#include <asm/io.h>
+#include <asm/processor.h>	/* Processor type for cache alignment. */
+
+/* Operational parameters that usually are not changed. */
+
+#define CONFIG_SBMAC_COALESCE
+
+/* Time in jiffies before concluding the transmitter is hung. */
+#define TX_TIMEOUT  (2*HZ)
+
+
+MODULE_AUTHOR("Mitch Lichtenberg (Broadcom Corp.)");
+MODULE_DESCRIPTION("Broadcom SiByte SOC GB Ethernet driver");
+
+/* A few user-configurable values which may be modified when a driver
+   module is loaded. */
+
+/* 1 normal messages, 0 quiet .. 7 verbose. */
+static int debug = 1;
+module_param(debug, int, S_IRUGO);
+MODULE_PARM_DESC(debug, "Debug messages");
+
+#ifdef CONFIG_SBMAC_COALESCE
+static int int_pktcnt_tx = 255;
+module_param(int_pktcnt_tx, int, S_IRUGO);
+MODULE_PARM_DESC(int_pktcnt_tx, "TX packet count");
+
+static int int_timeout_tx = 255;
+module_param(int_timeout_tx, int, S_IRUGO);
+MODULE_PARM_DESC(int_timeout_tx, "TX timeout value");
+
+static int int_pktcnt_rx = 64;
+module_param(int_pktcnt_rx, int, S_IRUGO);
+MODULE_PARM_DESC(int_pktcnt_rx, "RX packet count");
+
+static int int_timeout_rx = 64;
+module_param(int_timeout_rx, int, S_IRUGO);
+MODULE_PARM_DESC(int_timeout_rx, "RX timeout value");
+#endif
+
+#include <asm/sibyte/board.h>
+#include <asm/sibyte/sb1250.h>
+#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
+#include <asm/sibyte/bcm1480_regs.h>
+#include <asm/sibyte/bcm1480_int.h>
+#define R_MAC_DMA_OODPKTLOST_RX	R_MAC_DMA_OODPKTLOST
+#elif defined(CONFIG_SIBYTE_SB1250) || defined(CONFIG_SIBYTE_BCM112X)
+#include <asm/sibyte/sb1250_regs.h>
+#include <asm/sibyte/sb1250_int.h>
+#else
+#error invalid SiByte MAC configuration
+#endif
+#include <asm/sibyte/sb1250_scd.h>
+#include <asm/sibyte/sb1250_mac.h>
+#include <asm/sibyte/sb1250_dma.h>
+
+#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
+#define UNIT_INT(n)		(K_BCM1480_INT_MAC_0 + ((n) * 2))
+#elif defined(CONFIG_SIBYTE_SB1250) || defined(CONFIG_SIBYTE_BCM112X)
+#define UNIT_INT(n)		(K_INT_MAC_0 + (n))
+#else
+#error invalid SiByte MAC configuration
+#endif
+
+#ifdef K_INT_PHY
+#define SBMAC_PHY_INT			K_INT_PHY
+#else
+#define SBMAC_PHY_INT			PHY_POLL
+#endif
+
+/**********************************************************************
+ *  Simple types
+ ********************************************************************* */
+
+enum sbmac_speed {
+	sbmac_speed_none = 0,
+	sbmac_speed_10 = SPEED_10,
+	sbmac_speed_100 = SPEED_100,
+	sbmac_speed_1000 = SPEED_1000,
+};
+
+enum sbmac_duplex {
+	sbmac_duplex_none = -1,
+	sbmac_duplex_half = DUPLEX_HALF,
+	sbmac_duplex_full = DUPLEX_FULL,
+};
+
+enum sbmac_fc {
+	sbmac_fc_none,
+	sbmac_fc_disabled,
+	sbmac_fc_frame,
+	sbmac_fc_collision,
+	sbmac_fc_carrier,
+};
+
+enum sbmac_state {
+	sbmac_state_uninit,
+	sbmac_state_off,
+	sbmac_state_on,
+	sbmac_state_broken,
+};
+
+
+/**********************************************************************
+ *  Macros
+ ********************************************************************* */
+
+
+#define SBDMA_NEXTBUF(d,f) ((((d)->f+1) == (d)->sbdma_dscrtable_end) ? \
+			  (d)->sbdma_dscrtable : (d)->f+1)
+
+
+#define NUMCACHEBLKS(x) (((x)+SMP_CACHE_BYTES-1)/SMP_CACHE_BYTES)
+
+#define SBMAC_MAX_TXDESCR	256
+#define SBMAC_MAX_RXDESCR	256
+
+#define ETHER_ADDR_LEN		6
+#define ENET_PACKET_SIZE	1518
+/*#define ENET_PACKET_SIZE	9216 */
+
+/**********************************************************************
+ *  DMA Descriptor structure
+ ********************************************************************* */
+
+struct sbdmadscr {
+	uint64_t  dscr_a;
+	uint64_t  dscr_b;
+};
+
+/**********************************************************************
+ *  DMA Controller structure
+ ********************************************************************* */
+
+struct sbmacdma {
+
+	/*
+	 * This stuff is used to identify the channel and the registers
+	 * associated with it.
+	 */
+	struct sbmac_softc	*sbdma_eth;	/* back pointer to associated
+						   MAC */
+	int			sbdma_channel;	/* channel number */
+	int			sbdma_txdir;	/* direction (1=transmit) */
+	int			sbdma_maxdescr;	/* total # of descriptors
+						   in ring */
+#ifdef CONFIG_SBMAC_COALESCE
+	int			sbdma_int_pktcnt;
+						/* # descriptors rx/tx
+						   before interrupt */
+	int			sbdma_int_timeout;
+						/* # usec rx/tx interrupt */
+#endif
+	void __iomem		*sbdma_config0;	/* DMA config register 0 */
+	void __iomem		*sbdma_config1;	/* DMA config register 1 */
+	void __iomem		*sbdma_dscrbase;
+						/* descriptor base address */
+	void __iomem		*sbdma_dscrcnt;	/* descriptor count register */
+	void __iomem		*sbdma_curdscr;	/* current descriptor
+						   address */
+	void __iomem		*sbdma_oodpktlost;
+						/* pkt drop (rx only) */
+
+	/*
+	 * This stuff is for maintenance of the ring
+	 */
+	void			*sbdma_dscrtable_unaligned;
+	struct sbdmadscr	*sbdma_dscrtable;
+						/* base of descriptor table */
+	struct sbdmadscr	*sbdma_dscrtable_end;
+						/* end of descriptor table */
+	struct sk_buff		**sbdma_ctxtable;
+						/* context table, one
+						   per descr */
+	dma_addr_t		sbdma_dscrtable_phys;
+						/* and also the phys addr */
+	struct sbdmadscr	*sbdma_addptr;	/* next dscr for sw to add */
+	struct sbdmadscr	*sbdma_remptr;	/* next dscr for sw
+						   to remove */
+};
+
+
+/**********************************************************************
+ *  Ethernet softc structure
+ ********************************************************************* */
+
+struct sbmac_softc {
+
+	/*
+	 * Linux-specific things
+	 */
+	struct net_device	*sbm_dev;	/* pointer to linux device */
+	struct napi_struct	napi;
+	struct phy_device	*phy_dev;	/* the associated PHY device */
+	struct mii_bus		*mii_bus;	/* the MII bus */
+	int			phy_irq[PHY_MAX_ADDR];
+	spinlock_t		sbm_lock;	/* spin lock */
+	int			sbm_devflags;	/* current device flags */
+
+	/*
+	 * Controller-specific things
+	 */
+	void __iomem		*sbm_base;	/* MAC's base address */
+	enum sbmac_state	sbm_state;	/* current state */
+
+	void __iomem		*sbm_macenable;	/* MAC Enable Register */
+	void __iomem		*sbm_maccfg;	/* MAC Config Register */
+	void __iomem		*sbm_fifocfg;	/* FIFO Config Register */
+	void __iomem		*sbm_framecfg;	/* Frame Config Register */
+	void __iomem		*sbm_rxfilter;	/* Receive Filter Register */
+	void __iomem		*sbm_isr;	/* Interrupt Status Register */
+	void __iomem		*sbm_imr;	/* Interrupt Mask Register */
+	void __iomem		*sbm_mdio;	/* MDIO Register */
+
+	enum sbmac_speed	sbm_speed;	/* current speed */
+	enum sbmac_duplex	sbm_duplex;	/* current duplex */
+	enum sbmac_fc		sbm_fc;		/* cur. flow control setting */
+	int			sbm_pause;	/* current pause setting */
+	int			sbm_link;	/* current link state */
+
+	unsigned char		sbm_hwaddr[ETHER_ADDR_LEN];
+
+	struct sbmacdma		sbm_txdma;	/* only channel 0 for now */
+	struct sbmacdma		sbm_rxdma;
+	int			rx_hw_checksum;
+	int			sbe_idx;
+};
+
+
+/**********************************************************************
+ *  Externs
+ ********************************************************************* */
+
+/**********************************************************************
+ *  Prototypes
+ ********************************************************************* */
+
+static void sbdma_initctx(struct sbmacdma *d, struct sbmac_softc *s, int chan,
+			  int txrx, int maxdescr);
+static void sbdma_channel_start(struct sbmacdma *d, int rxtx);
+static int sbdma_add_rcvbuffer(struct sbmac_softc *sc, struct sbmacdma *d,
+			       struct sk_buff *m);
+static int sbdma_add_txbuffer(struct sbmacdma *d, struct sk_buff *m);
+static void sbdma_emptyring(struct sbmacdma *d);
+static void sbdma_fillring(struct sbmac_softc *sc, struct sbmacdma *d);
+static int sbdma_rx_process(struct sbmac_softc *sc, struct sbmacdma *d,
+			    int work_to_do, int poll);
+static void sbdma_tx_process(struct sbmac_softc *sc, struct sbmacdma *d,
+			     int poll);
+static int sbmac_initctx(struct sbmac_softc *s);
+static void sbmac_channel_start(struct sbmac_softc *s);
+static void sbmac_channel_stop(struct sbmac_softc *s);
+static enum sbmac_state sbmac_set_channel_state(struct sbmac_softc *,
+						enum sbmac_state);
+static void sbmac_promiscuous_mode(struct sbmac_softc *sc, int onoff);
+static uint64_t sbmac_addr2reg(unsigned char *ptr);
+static irqreturn_t sbmac_intr(int irq, void *dev_instance);
+static int sbmac_start_tx(struct sk_buff *skb, struct net_device *dev);
+static void sbmac_setmulti(struct sbmac_softc *sc);
+static int sbmac_init(struct platform_device *pldev, long long base);
+static int sbmac_set_speed(struct sbmac_softc *s, enum sbmac_speed speed);
+static int sbmac_set_duplex(struct sbmac_softc *s, enum sbmac_duplex duplex,
+			    enum sbmac_fc fc);
+
+static int sbmac_open(struct net_device *dev);
+static void sbmac_tx_timeout (struct net_device *dev);
+static void sbmac_set_rx_mode(struct net_device *dev);
+static int sbmac_mii_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
+static int sbmac_close(struct net_device *dev);
+static int sbmac_poll(struct napi_struct *napi, int budget);
+
+static void sbmac_mii_poll(struct net_device *dev);
+static int sbmac_mii_probe(struct net_device *dev);
+
+static void sbmac_mii_sync(void __iomem *sbm_mdio);
+static void sbmac_mii_senddata(void __iomem *sbm_mdio, unsigned int data,
+			       int bitcnt);
+static int sbmac_mii_read(struct mii_bus *bus, int phyaddr, int regidx);
+static int sbmac_mii_write(struct mii_bus *bus, int phyaddr, int regidx,
+			   u16 val);
+
+
+/**********************************************************************
+ *  Globals
+ ********************************************************************* */
+
+static char sbmac_string[] = "sb1250-mac";
+
+static char sbmac_mdio_string[] = "sb1250-mac-mdio";
+
+
+/**********************************************************************
+ *  MDIO constants
+ ********************************************************************* */
+
+#define	MII_COMMAND_START	0x01
+#define	MII_COMMAND_READ	0x02
+#define	MII_COMMAND_WRITE	0x01
+#define	MII_COMMAND_ACK		0x02
+
+#define M_MAC_MDIO_DIR_OUTPUT	0		/* for clarity */
+
+#define ENABLE 		1
+#define DISABLE		0
+
+/**********************************************************************
+ *  SBMAC_MII_SYNC(sbm_mdio)
+ *
+ *  Synchronize with the MII - send a pattern of bits to the MII
+ *  that will guarantee that it is ready to accept a command.
+ *
+ *  Input parameters:
+ *  	   sbm_mdio - address of the MAC's MDIO register
+ *
+ *  Return value:
+ *  	   nothing
+ ********************************************************************* */
+
+static void sbmac_mii_sync(void __iomem *sbm_mdio)
+{
+	int cnt;
+	uint64_t bits;
+	int mac_mdio_genc;
+
+	mac_mdio_genc = __raw_readq(sbm_mdio) & M_MAC_GENC;
+
+	bits = M_MAC_MDIO_DIR_OUTPUT | M_MAC_MDIO_OUT;
+
+	__raw_writeq(bits | mac_mdio_genc, sbm_mdio);
+
+	for (cnt = 0; cnt < 32; cnt++) {
+		__raw_writeq(bits | M_MAC_MDC | mac_mdio_genc, sbm_mdio);
+		__raw_writeq(bits | mac_mdio_genc, sbm_mdio);
+	}
+}
+
+/**********************************************************************
+ *  SBMAC_MII_SENDDATA(sbm_mdio, data, bitcnt)
+ *
+ *  Send some bits to the MII.  The bits to be sent are right-
+ *  justified in the 'data' parameter.
+ *
+ *  Input parameters:
+ *  	   sbm_mdio - address of the MAC's MDIO register
+ *  	   data     - data to send
+ *  	   bitcnt   - number of bits to send
+ ********************************************************************* */
+
+static void sbmac_mii_senddata(void __iomem *sbm_mdio, unsigned int data,
+			       int bitcnt)
+{
+	int i;
+	uint64_t bits;
+	unsigned int curmask;
+	int mac_mdio_genc;
+
+	mac_mdio_genc = __raw_readq(sbm_mdio) & M_MAC_GENC;
+
+	bits = M_MAC_MDIO_DIR_OUTPUT;
+	__raw_writeq(bits | mac_mdio_genc, sbm_mdio);
+
+	curmask = 1 << (bitcnt - 1);
+
+	for (i = 0; i < bitcnt; i++) {
+		if (data & curmask)
+			bits |= M_MAC_MDIO_OUT;
+		else bits &= ~M_MAC_MDIO_OUT;
+		__raw_writeq(bits | mac_mdio_genc, sbm_mdio);
+		__raw_writeq(bits | M_MAC_MDC | mac_mdio_genc, sbm_mdio);
+		__raw_writeq(bits | mac_mdio_genc, sbm_mdio);
+		curmask >>= 1;
+	}
+}
+
+
+
+/**********************************************************************
+ *  SBMAC_MII_READ(bus, phyaddr, regidx)
+ *  Read a PHY register.
+ *
+ *  Input parameters:
+ *  	   bus     - MDIO bus handle
+ *  	   phyaddr - PHY's address
+ *  	   regnum  - index of register to read
+ *
+ *  Return value:
+ *  	   value read, or 0xffff if an error occurred.
+ ********************************************************************* */
+
+static int sbmac_mii_read(struct mii_bus *bus, int phyaddr, int regidx)
+{
+	struct sbmac_softc *sc = (struct sbmac_softc *)bus->priv;
+	void __iomem *sbm_mdio = sc->sbm_mdio;
+	int idx;
+	int error;
+	int regval;
+	int mac_mdio_genc;
+
+	/*
+	 * Synchronize ourselves so that the PHY knows the next
+	 * thing coming down is a command
+	 */
+	sbmac_mii_sync(sbm_mdio);
+
+	/*
+	 * Send the data to the PHY.  The sequence is
+	 * a "start" command (2 bits)
+	 * a "read" command (2 bits)
+	 * the PHY addr (5 bits)
+	 * the register index (5 bits)
+	 */
+	sbmac_mii_senddata(sbm_mdio, MII_COMMAND_START, 2);
+	sbmac_mii_senddata(sbm_mdio, MII_COMMAND_READ, 2);
+	sbmac_mii_senddata(sbm_mdio, phyaddr, 5);
+	sbmac_mii_senddata(sbm_mdio, regidx, 5);
+
+	mac_mdio_genc = __raw_readq(sbm_mdio) & M_MAC_GENC;
+
+	/*
+	 * Switch the port around without a clock transition.
+	 */
+	__raw_writeq(M_MAC_MDIO_DIR_INPUT | mac_mdio_genc, sbm_mdio);
+
+	/*
+	 * Send out a clock pulse to signal we want the status
+	 */
+	__raw_writeq(M_MAC_MDIO_DIR_INPUT | M_MAC_MDC | mac_mdio_genc,
+		     sbm_mdio);
+	__raw_writeq(M_MAC_MDIO_DIR_INPUT | mac_mdio_genc, sbm_mdio);
+
+	/*
+	 * If an error occurred, the PHY will signal '1' back
+	 */
+	error = __raw_readq(sbm_mdio) & M_MAC_MDIO_IN;
+
+	/*
+	 * Issue an 'idle' clock pulse, but keep the direction
+	 * the same.
+	 */
+	__raw_writeq(M_MAC_MDIO_DIR_INPUT | M_MAC_MDC | mac_mdio_genc,
+		     sbm_mdio);
+	__raw_writeq(M_MAC_MDIO_DIR_INPUT | mac_mdio_genc, sbm_mdio);
+
+	regval = 0;
+
+	for (idx = 0; idx < 16; idx++) {
+		regval <<= 1;
+
+		if (error == 0) {
+			if (__raw_readq(sbm_mdio) & M_MAC_MDIO_IN)
+				regval |= 1;
+		}
+
+		__raw_writeq(M_MAC_MDIO_DIR_INPUT | M_MAC_MDC | mac_mdio_genc,
+			     sbm_mdio);
+		__raw_writeq(M_MAC_MDIO_DIR_INPUT | mac_mdio_genc, sbm_mdio);
+	}
+
+	/* Switch back to output */
+	__raw_writeq(M_MAC_MDIO_DIR_OUTPUT | mac_mdio_genc, sbm_mdio);
+
+	if (error == 0)
+		return regval;
+	return 0xffff;
+}
+
+
+/**********************************************************************
+ *  SBMAC_MII_WRITE(bus, phyaddr, regidx, regval)
+ *
+ *  Write a value to a PHY register.
+ *
+ *  Input parameters:
+ *  	   bus     - MDIO bus handle
+ *  	   phyaddr - PHY to use
+ *  	   regidx  - register within the PHY
+ *  	   regval  - data to write to register
+ *
+ *  Return value:
+ *  	   0 for success
+ ********************************************************************* */
+
+static int sbmac_mii_write(struct mii_bus *bus, int phyaddr, int regidx,
+			   u16 regval)
+{
+	struct sbmac_softc *sc = (struct sbmac_softc *)bus->priv;
+	void __iomem *sbm_mdio = sc->sbm_mdio;
+	int mac_mdio_genc;
+
+	sbmac_mii_sync(sbm_mdio);
+
+	sbmac_mii_senddata(sbm_mdio, MII_COMMAND_START, 2);
+	sbmac_mii_senddata(sbm_mdio, MII_COMMAND_WRITE, 2);
+	sbmac_mii_senddata(sbm_mdio, phyaddr, 5);
+	sbmac_mii_senddata(sbm_mdio, regidx, 5);
+	sbmac_mii_senddata(sbm_mdio, MII_COMMAND_ACK, 2);
+	sbmac_mii_senddata(sbm_mdio, regval, 16);
+
+	mac_mdio_genc = __raw_readq(sbm_mdio) & M_MAC_GENC;
+
+	__raw_writeq(M_MAC_MDIO_DIR_OUTPUT | mac_mdio_genc, sbm_mdio);
+
+	return 0;
+}
+
+
+
+/**********************************************************************
+ *  SBDMA_INITCTX(d,s,chan,txrx,maxdescr)
+ *
+ *  Initialize a DMA channel context.  Since there are potentially
+ *  eight DMA channels per MAC, it's nice to do this in a standard
+ *  way.
+ *
+ *  Input parameters:
+ *  	   d - struct sbmacdma (DMA channel context)
+ *  	   s - struct sbmac_softc (pointer to a MAC)
+ *  	   chan - channel number (0..1 right now)
+ *  	   txrx - Identifies DMA_TX or DMA_RX for channel direction
+ *      maxdescr - number of descriptors
+ *
+ *  Return value:
+ *  	   nothing
+ ********************************************************************* */
+
+static void sbdma_initctx(struct sbmacdma *d, struct sbmac_softc *s, int chan,
+			  int txrx, int maxdescr)
+{
+#ifdef CONFIG_SBMAC_COALESCE
+	int int_pktcnt, int_timeout;
+#endif
+
+	/*
+	 * Save away interesting stuff in the structure
+	 */
+
+	d->sbdma_eth       = s;
+	d->sbdma_channel   = chan;
+	d->sbdma_txdir     = txrx;
+
+#if 0
+	/* RMON clearing */
+	s->sbe_idx =(s->sbm_base - A_MAC_BASE_0)/MAC_SPACING;
+#endif
+
+	__raw_writeq(0, s->sbm_base + R_MAC_RMON_TX_BYTES);
+	__raw_writeq(0, s->sbm_base + R_MAC_RMON_COLLISIONS);
+	__raw_writeq(0, s->sbm_base + R_MAC_RMON_LATE_COL);
+	__raw_writeq(0, s->sbm_base + R_MAC_RMON_EX_COL);
+	__raw_writeq(0, s->sbm_base + R_MAC_RMON_FCS_ERROR);
+	__raw_writeq(0, s->sbm_base + R_MAC_RMON_TX_ABORT);
+	__raw_writeq(0, s->sbm_base + R_MAC_RMON_TX_BAD);
+	__raw_writeq(0, s->sbm_base + R_MAC_RMON_TX_GOOD);
+	__raw_writeq(0, s->sbm_base + R_MAC_RMON_TX_RUNT);
+	__raw_writeq(0, s->sbm_base + R_MAC_RMON_TX_OVERSIZE);
+	__raw_writeq(0, s->sbm_base + R_MAC_RMON_RX_BYTES);
+	__raw_writeq(0, s->sbm_base + R_MAC_RMON_RX_MCAST);
+	__raw_writeq(0, s->sbm_base + R_MAC_RMON_RX_BCAST);
+	__raw_writeq(0, s->sbm_base + R_MAC_RMON_RX_BAD);
+	__raw_writeq(0, s->sbm_base + R_MAC_RMON_RX_GOOD);
+	__raw_writeq(0, s->sbm_base + R_MAC_RMON_RX_RUNT);
+	__raw_writeq(0, s->sbm_base + R_MAC_RMON_RX_OVERSIZE);
+	__raw_writeq(0, s->sbm_base + R_MAC_RMON_RX_FCS_ERROR);
+	__raw_writeq(0, s->sbm_base + R_MAC_RMON_RX_LENGTH_ERROR);
+	__raw_writeq(0, s->sbm_base + R_MAC_RMON_RX_CODE_ERROR);
+	__raw_writeq(0, s->sbm_base + R_MAC_RMON_RX_ALIGN_ERROR);
+
+	/*
+	 * initialize register pointers
+	 */
+
+	d->sbdma_config0 =
+		s->sbm_base + R_MAC_DMA_REGISTER(txrx,chan,R_MAC_DMA_CONFIG0);
+	d->sbdma_config1 =
+		s->sbm_base + R_MAC_DMA_REGISTER(txrx,chan,R_MAC_DMA_CONFIG1);
+	d->sbdma_dscrbase =
+		s->sbm_base + R_MAC_DMA_REGISTER(txrx,chan,R_MAC_DMA_DSCR_BASE);
+	d->sbdma_dscrcnt =
+		s->sbm_base + R_MAC_DMA_REGISTER(txrx,chan,R_MAC_DMA_DSCR_CNT);
+	d->sbdma_curdscr =
+		s->sbm_base + R_MAC_DMA_REGISTER(txrx,chan,R_MAC_DMA_CUR_DSCRADDR);
+	if (d->sbdma_txdir)
+		d->sbdma_oodpktlost = NULL;
+	else
+		d->sbdma_oodpktlost =
+			s->sbm_base + R_MAC_DMA_REGISTER(txrx,chan,R_MAC_DMA_OODPKTLOST_RX);
+
+	/*
+	 * Allocate memory for the ring
+	 */
+
+	d->sbdma_maxdescr = maxdescr;
+
+	d->sbdma_dscrtable_unaligned = kcalloc(d->sbdma_maxdescr + 1,
+					       sizeof(*d->sbdma_dscrtable),
+					       GFP_KERNEL);
+
+	/*
+	 * The descriptor table must be aligned to at least 16 bytes or the
+	 * MAC will corrupt it.
+	 */
+	d->sbdma_dscrtable = (struct sbdmadscr *)
+			     ALIGN((unsigned long)d->sbdma_dscrtable_unaligned,
+				   sizeof(*d->sbdma_dscrtable));
+
+	d->sbdma_dscrtable_end = d->sbdma_dscrtable + d->sbdma_maxdescr;
+
+	d->sbdma_dscrtable_phys = virt_to_phys(d->sbdma_dscrtable);
+
+	/*
+	 * And context table
+	 */
+
+	d->sbdma_ctxtable = kcalloc(d->sbdma_maxdescr,
+				    sizeof(*d->sbdma_ctxtable), GFP_KERNEL);
+
+#ifdef CONFIG_SBMAC_COALESCE
+	/*
+	 * Setup Rx/Tx DMA coalescing defaults
+	 */
+
+	int_pktcnt = (txrx == DMA_TX) ? int_pktcnt_tx : int_pktcnt_rx;
+	if ( int_pktcnt ) {
+		d->sbdma_int_pktcnt = int_pktcnt;
+	} else {
+		d->sbdma_int_pktcnt = 1;
+	}
+
+	int_timeout = (txrx == DMA_TX) ? int_timeout_tx : int_timeout_rx;
+	if ( int_timeout ) {
+		d->sbdma_int_timeout = int_timeout;
+	} else {
+		d->sbdma_int_timeout = 0;
+	}
+#endif
+
+}
+
+/**********************************************************************
+ *  SBDMA_CHANNEL_START(d)
+ *
+ *  Initialize the hardware registers for a DMA channel.
+ *
+ *  Input parameters:
+ *  	   d - DMA channel to init (context must be previously init'd
+ *         rxtx - DMA_RX or DMA_TX depending on what type of channel
+ *
+ *  Return value:
+ *  	   nothing
+ ********************************************************************* */
+
+static void sbdma_channel_start(struct sbmacdma *d, int rxtx)
+{
+	/*
+	 * Turn on the DMA channel
+	 */
+
+#ifdef CONFIG_SBMAC_COALESCE
+	__raw_writeq(V_DMA_INT_TIMEOUT(d->sbdma_int_timeout) |
+		       0, d->sbdma_config1);
+	__raw_writeq(M_DMA_EOP_INT_EN |
+		       V_DMA_RINGSZ(d->sbdma_maxdescr) |
+		       V_DMA_INT_PKTCNT(d->sbdma_int_pktcnt) |
+		       0, d->sbdma_config0);
+#else
+	__raw_writeq(0, d->sbdma_config1);
+	__raw_writeq(V_DMA_RINGSZ(d->sbdma_maxdescr) |
+		       0, d->sbdma_config0);
+#endif
+
+	__raw_writeq(d->sbdma_dscrtable_phys, d->sbdma_dscrbase);
+
+	/*
+	 * Initialize ring pointers
+	 */
+
+	d->sbdma_addptr = d->sbdma_dscrtable;
+	d->sbdma_remptr = d->sbdma_dscrtable;
+}
+
+/**********************************************************************
+ *  SBDMA_CHANNEL_STOP(d)
+ *
+ *  Initialize the hardware registers for a DMA channel.
+ *
+ *  Input parameters:
+ *  	   d - DMA channel to init (context must be previously init'd
+ *
+ *  Return value:
+ *  	   nothing
+ ********************************************************************* */
+
+static void sbdma_channel_stop(struct sbmacdma *d)
+{
+	/*
+	 * Turn off the DMA channel
+	 */
+
+	__raw_writeq(0, d->sbdma_config1);
+
+	__raw_writeq(0, d->sbdma_dscrbase);
+
+	__raw_writeq(0, d->sbdma_config0);
+
+	/*
+	 * Zero ring pointers
+	 */
+
+	d->sbdma_addptr = NULL;
+	d->sbdma_remptr = NULL;
+}
+
+static inline void sbdma_align_skb(struct sk_buff *skb,
+				   unsigned int power2, unsigned int offset)
+{
+	unsigned char *addr = skb->data;
+	unsigned char *newaddr = PTR_ALIGN(addr, power2);
+
+	skb_reserve(skb, newaddr - addr + offset);
+}
+
+
+/**********************************************************************
+ *  SBDMA_ADD_RCVBUFFER(d,sb)
+ *
+ *  Add a buffer to the specified DMA channel.   For receive channels,
+ *  this queues a buffer for inbound packets.
+ *
+ *  Input parameters:
+ *	   sc - softc structure
+ *  	    d - DMA channel descriptor
+ * 	   sb - sk_buff to add, or NULL if we should allocate one
+ *
+ *  Return value:
+ *  	   0 if buffer could not be added (ring is full)
+ *  	   1 if buffer added successfully
+ ********************************************************************* */
+
+
+static int sbdma_add_rcvbuffer(struct sbmac_softc *sc, struct sbmacdma *d,
+			       struct sk_buff *sb)
+{
+	struct net_device *dev = sc->sbm_dev;
+	struct sbdmadscr *dsc;
+	struct sbdmadscr *nextdsc;
+	struct sk_buff *sb_new = NULL;
+	int pktsize = ENET_PACKET_SIZE;
+
+	/* get pointer to our current place in the ring */
+
+	dsc = d->sbdma_addptr;
+	nextdsc = SBDMA_NEXTBUF(d,sbdma_addptr);
+
+	/*
+	 * figure out if the ring is full - if the next descriptor
+	 * is the same as the one that we're going to remove from
+	 * the ring, the ring is full
+	 */
+
+	if (nextdsc == d->sbdma_remptr) {
+		return -ENOSPC;
+	}
+
+	/*
+	 * Allocate a sk_buff if we don't already have one.
+	 * If we do have an sk_buff, reset it so that it's empty.
+	 *
+	 * Note: sk_buffs don't seem to be guaranteed to have any sort
+	 * of alignment when they are allocated.  Therefore, allocate enough
+	 * extra space to make sure that:
+	 *
+	 *    1. the data does not start in the middle of a cache line.
+	 *    2. The data does not end in the middle of a cache line
+	 *    3. The buffer can be aligned such that the IP addresses are
+	 *       naturally aligned.
+	 *
+	 *  Remember, the SOCs MAC writes whole cache lines at a time,
+	 *  without reading the old contents first.  So, if the sk_buff's
+	 *  data portion starts in the middle of a cache line, the SOC
+	 *  DMA will trash the beginning (and ending) portions.
+	 */
+
+	if (sb == NULL) {
+		sb_new = netdev_alloc_skb(dev, ENET_PACKET_SIZE +
+					       SMP_CACHE_BYTES * 2 +
+					       NET_IP_ALIGN);
+		if (sb_new == NULL) {
+			pr_info("%s: sk_buff allocation failed\n",
+			       d->sbdma_eth->sbm_dev->name);
+			return -ENOBUFS;
+		}
+
+		sbdma_align_skb(sb_new, SMP_CACHE_BYTES, NET_IP_ALIGN);
+	}
+	else {
+		sb_new = sb;
+		/*
+		 * nothing special to reinit buffer, it's already aligned
+		 * and sb->data already points to a good place.
+		 */
+	}
+
+	/*
+	 * fill in the descriptor
+	 */
+
+#ifdef CONFIG_SBMAC_COALESCE
+	/*
+	 * Do not interrupt per DMA transfer.
+	 */
+	dsc->dscr_a = virt_to_phys(sb_new->data) |
+		V_DMA_DSCRA_A_SIZE(NUMCACHEBLKS(pktsize + NET_IP_ALIGN)) | 0;
+#else
+	dsc->dscr_a = virt_to_phys(sb_new->data) |
+		V_DMA_DSCRA_A_SIZE(NUMCACHEBLKS(pktsize + NET_IP_ALIGN)) |
+		M_DMA_DSCRA_INTERRUPT;
+#endif
+
+	/* receiving: no options */
+	dsc->dscr_b = 0;
+
+	/*
+	 * fill in the context
+	 */
+
+	d->sbdma_ctxtable[dsc-d->sbdma_dscrtable] = sb_new;
+
+	/*
+	 * point at next packet
+	 */
+
+	d->sbdma_addptr = nextdsc;
+
+	/*
+	 * Give the buffer to the DMA engine.
+	 */
+
+	__raw_writeq(1, d->sbdma_dscrcnt);
+
+	return 0;					/* we did it */
+}
+
+/**********************************************************************
+ *  SBDMA_ADD_TXBUFFER(d,sb)
+ *
+ *  Add a transmit buffer to the specified DMA channel, causing a
+ *  transmit to start.
+ *
+ *  Input parameters:
+ *  	   d - DMA channel descriptor
+ * 	   sb - sk_buff to add
+ *
+ *  Return value:
+ *  	   0 transmit queued successfully
+ *  	   otherwise error code
+ ********************************************************************* */
+
+
+static int sbdma_add_txbuffer(struct sbmacdma *d, struct sk_buff *sb)
+{
+	struct sbdmadscr *dsc;
+	struct sbdmadscr *nextdsc;
+	uint64_t phys;
+	uint64_t ncb;
+	int length;
+
+	/* get pointer to our current place in the ring */
+
+	dsc = d->sbdma_addptr;
+	nextdsc = SBDMA_NEXTBUF(d,sbdma_addptr);
+
+	/*
+	 * figure out if the ring is full - if the next descriptor
+	 * is the same as the one that we're going to remove from
+	 * the ring, the ring is full
+	 */
+
+	if (nextdsc == d->sbdma_remptr) {
+		return -ENOSPC;
+	}
+
+	/*
+	 * Under Linux, it's not necessary to copy/coalesce buffers
+	 * like it is on NetBSD.  We think they're all contiguous,
+	 * but that may not be true for GBE.
+	 */
+
+	length = sb->len;
+
+	/*
+	 * fill in the descriptor.  Note that the number of cache
+	 * blocks in the descriptor is the number of blocks
+	 * *spanned*, so we need to add in the offset (if any)
+	 * while doing the calculation.
+	 */
+
+	phys = virt_to_phys(sb->data);
+	ncb = NUMCACHEBLKS(length+(phys & (SMP_CACHE_BYTES - 1)));
+
+	dsc->dscr_a = phys |
+		V_DMA_DSCRA_A_SIZE(ncb) |
+#ifndef CONFIG_SBMAC_COALESCE
+		M_DMA_DSCRA_INTERRUPT |
+#endif
+		M_DMA_ETHTX_SOP;
+
+	/* transmitting: set outbound options and length */
+
+	dsc->dscr_b = V_DMA_DSCRB_OPTIONS(K_DMA_ETHTX_APPENDCRC_APPENDPAD) |
+		V_DMA_DSCRB_PKT_SIZE(length);
+
+	/*
+	 * fill in the context
+	 */
+
+	d->sbdma_ctxtable[dsc-d->sbdma_dscrtable] = sb;
+
+	/*
+	 * point at next packet
+	 */
+
+	d->sbdma_addptr = nextdsc;
+
+	/*
+	 * Give the buffer to the DMA engine.
+	 */
+
+	__raw_writeq(1, d->sbdma_dscrcnt);
+
+	return 0;					/* we did it */
+}
+
+
+
+
+/**********************************************************************
+ *  SBDMA_EMPTYRING(d)
+ *
+ *  Free all allocated sk_buffs on the specified DMA channel;
+ *
+ *  Input parameters:
+ *  	   d  - DMA channel
+ *
+ *  Return value:
+ *  	   nothing
+ ********************************************************************* */
+
+static void sbdma_emptyring(struct sbmacdma *d)
+{
+	int idx;
+	struct sk_buff *sb;
+
+	for (idx = 0; idx < d->sbdma_maxdescr; idx++) {
+		sb = d->sbdma_ctxtable[idx];
+		if (sb) {
+			dev_kfree_skb(sb);
+			d->sbdma_ctxtable[idx] = NULL;
+		}
+	}
+}
+
+
+/**********************************************************************
+ *  SBDMA_FILLRING(d)
+ *
+ *  Fill the specified DMA channel (must be receive channel)
+ *  with sk_buffs
+ *
+ *  Input parameters:
+ *	   sc - softc structure
+ *  	    d - DMA channel
+ *
+ *  Return value:
+ *  	   nothing
+ ********************************************************************* */
+
+static void sbdma_fillring(struct sbmac_softc *sc, struct sbmacdma *d)
+{
+	int idx;
+
+	for (idx = 0; idx < SBMAC_MAX_RXDESCR - 1; idx++) {
+		if (sbdma_add_rcvbuffer(sc, d, NULL) != 0)
+			break;
+	}
+}
+
+#ifdef CONFIG_NET_POLL_CONTROLLER
+static void sbmac_netpoll(struct net_device *netdev)
+{
+	struct sbmac_softc *sc = netdev_priv(netdev);
+	int irq = sc->sbm_dev->irq;
+
+	__raw_writeq(0, sc->sbm_imr);
+
+	sbmac_intr(irq, netdev);
+
+#ifdef CONFIG_SBMAC_COALESCE
+	__raw_writeq(((M_MAC_INT_EOP_COUNT | M_MAC_INT_EOP_TIMER) << S_MAC_TX_CH0) |
+	((M_MAC_INT_EOP_COUNT | M_MAC_INT_EOP_TIMER) << S_MAC_RX_CH0),
+	sc->sbm_imr);
+#else
+	__raw_writeq((M_MAC_INT_CHANNEL << S_MAC_TX_CH0) |
+	(M_MAC_INT_CHANNEL << S_MAC_RX_CH0), sc->sbm_imr);
+#endif
+}
+#endif
+
+/**********************************************************************
+ *  SBDMA_RX_PROCESS(sc,d,work_to_do,poll)
+ *
+ *  Process "completed" receive buffers on the specified DMA channel.
+ *
+ *  Input parameters:
+ *            sc - softc structure
+ *  	       d - DMA channel context
+ *    work_to_do - no. of packets to process before enabling interrupt
+ *                 again (for NAPI)
+ *          poll - 1: using polling (for NAPI)
+ *
+ *  Return value:
+ *  	   nothing
+ ********************************************************************* */
+
+static int sbdma_rx_process(struct sbmac_softc *sc, struct sbmacdma *d,
+			    int work_to_do, int poll)
+{
+	struct net_device *dev = sc->sbm_dev;
+	int curidx;
+	int hwidx;
+	struct sbdmadscr *dsc;
+	struct sk_buff *sb;
+	int len;
+	int work_done = 0;
+	int dropped = 0;
+
+	prefetch(d);
+
+again:
+	/* Check if the HW dropped any frames */
+	dev->stats.rx_fifo_errors
+	    += __raw_readq(sc->sbm_rxdma.sbdma_oodpktlost) & 0xffff;
+	__raw_writeq(0, sc->sbm_rxdma.sbdma_oodpktlost);
+
+	while (work_to_do-- > 0) {
+		/*
+		 * figure out where we are (as an index) and where
+		 * the hardware is (also as an index)
+		 *
+		 * This could be done faster if (for example) the
+		 * descriptor table was page-aligned and contiguous in
+		 * both virtual and physical memory -- you could then
+		 * just compare the low-order bits of the virtual address
+		 * (sbdma_remptr) and the physical address (sbdma_curdscr CSR)
+		 */
+
+		dsc = d->sbdma_remptr;
+		curidx = dsc - d->sbdma_dscrtable;
+
+		prefetch(dsc);
+		prefetch(&d->sbdma_ctxtable[curidx]);
+
+		hwidx = ((__raw_readq(d->sbdma_curdscr) & M_DMA_CURDSCR_ADDR) -
+			 d->sbdma_dscrtable_phys) /
+			sizeof(*d->sbdma_dscrtable);
+
+		/*
+		 * If they're the same, that means we've processed all
+		 * of the descriptors up to (but not including) the one that
+		 * the hardware is working on right now.
+		 */
+
+		if (curidx == hwidx)
+			goto done;
+
+		/*
+		 * Otherwise, get the packet's sk_buff ptr back
+		 */
+
+		sb = d->sbdma_ctxtable[curidx];
+		d->sbdma_ctxtable[curidx] = NULL;
+
+		len = (int)G_DMA_DSCRB_PKT_SIZE(dsc->dscr_b) - 4;
+
+		/*
+		 * Check packet status.  If good, process it.
+		 * If not, silently drop it and put it back on the
+		 * receive ring.
+		 */
+
+		if (likely (!(dsc->dscr_a & M_DMA_ETHRX_BAD))) {
+
+			/*
+			 * Add a new buffer to replace the old one.  If we fail
+			 * to allocate a buffer, we're going to drop this
+			 * packet and put it right back on the receive ring.
+			 */
+
+			if (unlikely(sbdma_add_rcvbuffer(sc, d, NULL) ==
+				     -ENOBUFS)) {
+				dev->stats.rx_dropped++;
+				/* Re-add old buffer */
+				sbdma_add_rcvbuffer(sc, d, sb);
+				/* No point in continuing at the moment */
+				printk(KERN_ERR "dropped packet (1)\n");
+				d->sbdma_remptr = SBDMA_NEXTBUF(d,sbdma_remptr);
+				goto done;
+			} else {
+				/*
+				 * Set length into the packet
+				 */
+				skb_put(sb,len);
+
+				/*
+				 * Buffer has been replaced on the
+				 * receive ring.  Pass the buffer to
+				 * the kernel
+				 */
+				sb->protocol = eth_type_trans(sb,d->sbdma_eth->sbm_dev);
+				/* Check hw IPv4/TCP checksum if supported */
+				if (sc->rx_hw_checksum == ENABLE) {
+					if (!((dsc->dscr_a) & M_DMA_ETHRX_BADIP4CS) &&
+					    !((dsc->dscr_a) & M_DMA_ETHRX_BADTCPCS)) {
+						sb->ip_summed = CHECKSUM_UNNECESSARY;
+						/* don't need to set sb->csum */
+					} else {
+						skb_checksum_none_assert(sb);
+					}
+				}
+				prefetch(sb->data);
+				prefetch((const void *)(((char *)sb->data)+32));
+				if (poll)
+					dropped = netif_receive_skb(sb);
+				else
+					dropped = netif_rx(sb);
+
+				if (dropped == NET_RX_DROP) {
+					dev->stats.rx_dropped++;
+					d->sbdma_remptr = SBDMA_NEXTBUF(d,sbdma_remptr);
+					goto done;
+				}
+				else {
+					dev->stats.rx_bytes += len;
+					dev->stats.rx_packets++;
+				}
+			}
+		} else {
+			/*
+			 * Packet was mangled somehow.  Just drop it and
+			 * put it back on the receive ring.
+			 */
+			dev->stats.rx_errors++;
+			sbdma_add_rcvbuffer(sc, d, sb);
+		}
+
+
+		/*
+		 * .. and advance to the next buffer.
+		 */
+
+		d->sbdma_remptr = SBDMA_NEXTBUF(d,sbdma_remptr);
+		work_done++;
+	}
+	if (!poll) {
+		work_to_do = 32;
+		goto again; /* collect fifo drop statistics again */
+	}
+done:
+	return work_done;
+}
+
+/**********************************************************************
+ *  SBDMA_TX_PROCESS(sc,d)
+ *
+ *  Process "completed" transmit buffers on the specified DMA channel.
+ *  This is normally called within the interrupt service routine.
+ *  Note that this isn't really ideal for priority channels, since
+ *  it processes all of the packets on a given channel before
+ *  returning.
+ *
+ *  Input parameters:
+ *      sc - softc structure
+ *  	 d - DMA channel context
+ *    poll - 1: using polling (for NAPI)
+ *
+ *  Return value:
+ *  	   nothing
+ ********************************************************************* */
+
+static void sbdma_tx_process(struct sbmac_softc *sc, struct sbmacdma *d,
+			     int poll)
+{
+	struct net_device *dev = sc->sbm_dev;
+	int curidx;
+	int hwidx;
+	struct sbdmadscr *dsc;
+	struct sk_buff *sb;
+	unsigned long flags;
+	int packets_handled = 0;
+
+	spin_lock_irqsave(&(sc->sbm_lock), flags);
+
+	if (d->sbdma_remptr == d->sbdma_addptr)
+	  goto end_unlock;
+
+	hwidx = ((__raw_readq(d->sbdma_curdscr) & M_DMA_CURDSCR_ADDR) -
+		 d->sbdma_dscrtable_phys) / sizeof(*d->sbdma_dscrtable);
+
+	for (;;) {
+		/*
+		 * figure out where we are (as an index) and where
+		 * the hardware is (also as an index)
+		 *
+		 * This could be done faster if (for example) the
+		 * descriptor table was page-aligned and contiguous in
+		 * both virtual and physical memory -- you could then
+		 * just compare the low-order bits of the virtual address
+		 * (sbdma_remptr) and the physical address (sbdma_curdscr CSR)
+		 */
+
+		curidx = d->sbdma_remptr - d->sbdma_dscrtable;
+
+		/*
+		 * If they're the same, that means we've processed all
+		 * of the descriptors up to (but not including) the one that
+		 * the hardware is working on right now.
+		 */
+
+		if (curidx == hwidx)
+			break;
+
+		/*
+		 * Otherwise, get the packet's sk_buff ptr back
+		 */
+
+		dsc = &(d->sbdma_dscrtable[curidx]);
+		sb = d->sbdma_ctxtable[curidx];
+		d->sbdma_ctxtable[curidx] = NULL;
+
+		/*
+		 * Stats
+		 */
+
+		dev->stats.tx_bytes += sb->len;
+		dev->stats.tx_packets++;
+
+		/*
+		 * for transmits, we just free buffers.
+		 */
+
+		dev_kfree_skb_irq(sb);
+
+		/*
+		 * .. and advance to the next buffer.
+		 */
+
+		d->sbdma_remptr = SBDMA_NEXTBUF(d,sbdma_remptr);
+
+		packets_handled++;
+
+	}
+
+	/*
+	 * Decide if we should wake up the protocol or not.
+	 * Other drivers seem to do this when we reach a low
+	 * watermark on the transmit queue.
+	 */
+
+	if (packets_handled)
+		netif_wake_queue(d->sbdma_eth->sbm_dev);
+
+end_unlock:
+	spin_unlock_irqrestore(&(sc->sbm_lock), flags);
+
+}
+
+
+
+/**********************************************************************
+ *  SBMAC_INITCTX(s)
+ *
+ *  Initialize an Ethernet context structure - this is called
+ *  once per MAC on the 1250.  Memory is allocated here, so don't
+ *  call it again from inside the ioctl routines that bring the
+ *  interface up/down
+ *
+ *  Input parameters:
+ *  	   s - sbmac context structure
+ *
+ *  Return value:
+ *  	   0
+ ********************************************************************* */
+
+static int sbmac_initctx(struct sbmac_softc *s)
+{
+
+	/*
+	 * figure out the addresses of some ports
+	 */
+
+	s->sbm_macenable = s->sbm_base + R_MAC_ENABLE;
+	s->sbm_maccfg    = s->sbm_base + R_MAC_CFG;
+	s->sbm_fifocfg   = s->sbm_base + R_MAC_THRSH_CFG;
+	s->sbm_framecfg  = s->sbm_base + R_MAC_FRAMECFG;
+	s->sbm_rxfilter  = s->sbm_base + R_MAC_ADFILTER_CFG;
+	s->sbm_isr       = s->sbm_base + R_MAC_STATUS;
+	s->sbm_imr       = s->sbm_base + R_MAC_INT_MASK;
+	s->sbm_mdio      = s->sbm_base + R_MAC_MDIO;
+
+	/*
+	 * Initialize the DMA channels.  Right now, only one per MAC is used
+	 * Note: Only do this _once_, as it allocates memory from the kernel!
+	 */
+
+	sbdma_initctx(&(s->sbm_txdma),s,0,DMA_TX,SBMAC_MAX_TXDESCR);
+	sbdma_initctx(&(s->sbm_rxdma),s,0,DMA_RX,SBMAC_MAX_RXDESCR);
+
+	/*
+	 * initial state is OFF
+	 */
+
+	s->sbm_state = sbmac_state_off;
+
+	return 0;
+}
+
+
+static void sbdma_uninitctx(struct sbmacdma *d)
+{
+	if (d->sbdma_dscrtable_unaligned) {
+		kfree(d->sbdma_dscrtable_unaligned);
+		d->sbdma_dscrtable_unaligned = d->sbdma_dscrtable = NULL;
+	}
+
+	if (d->sbdma_ctxtable) {
+		kfree(d->sbdma_ctxtable);
+		d->sbdma_ctxtable = NULL;
+	}
+}
+
+
+static void sbmac_uninitctx(struct sbmac_softc *sc)
+{
+	sbdma_uninitctx(&(sc->sbm_txdma));
+	sbdma_uninitctx(&(sc->sbm_rxdma));
+}
+
+
+/**********************************************************************
+ *  SBMAC_CHANNEL_START(s)
+ *
+ *  Start packet processing on this MAC.
+ *
+ *  Input parameters:
+ *  	   s - sbmac structure
+ *
+ *  Return value:
+ *  	   nothing
+ ********************************************************************* */
+
+static void sbmac_channel_start(struct sbmac_softc *s)
+{
+	uint64_t reg;
+	void __iomem *port;
+	uint64_t cfg,fifo,framecfg;
+	int idx, th_value;
+
+	/*
+	 * Don't do this if running
+	 */
+
+	if (s->sbm_state == sbmac_state_on)
+		return;
+
+	/*
+	 * Bring the controller out of reset, but leave it off.
+	 */
+
+	__raw_writeq(0, s->sbm_macenable);
+
+	/*
+	 * Ignore all received packets
+	 */
+
+	__raw_writeq(0, s->sbm_rxfilter);
+
+	/*
+	 * Calculate values for various control registers.
+	 */
+
+	cfg = M_MAC_RETRY_EN |
+		M_MAC_TX_HOLD_SOP_EN |
+		V_MAC_TX_PAUSE_CNT_16K |
+		M_MAC_AP_STAT_EN |
+		M_MAC_FAST_SYNC |
+		M_MAC_SS_EN |
+		0;
+
+	/*
+	 * Be sure that RD_THRSH+WR_THRSH <= 32 for pass1 pars
+	 * and make sure that RD_THRSH + WR_THRSH <=128 for pass2 and above
+	 * Use a larger RD_THRSH for gigabit
+	 */
+	if (soc_type == K_SYS_SOC_TYPE_BCM1250 && periph_rev < 2)
+		th_value = 28;
+	else
+		th_value = 64;
+
+	fifo = V_MAC_TX_WR_THRSH(4) |	/* Must be '4' or '8' */
+		((s->sbm_speed == sbmac_speed_1000)
+		 ? V_MAC_TX_RD_THRSH(th_value) : V_MAC_TX_RD_THRSH(4)) |
+		V_MAC_TX_RL_THRSH(4) |
+		V_MAC_RX_PL_THRSH(4) |
+		V_MAC_RX_RD_THRSH(4) |	/* Must be '4' */
+		V_MAC_RX_RL_THRSH(8) |
+		0;
+
+	framecfg = V_MAC_MIN_FRAMESZ_DEFAULT |
+		V_MAC_MAX_FRAMESZ_DEFAULT |
+		V_MAC_BACKOFF_SEL(1);
+
+	/*
+	 * Clear out the hash address map
+	 */
+
+	port = s->sbm_base + R_MAC_HASH_BASE;
+	for (idx = 0; idx < MAC_HASH_COUNT; idx++) {
+		__raw_writeq(0, port);
+		port += sizeof(uint64_t);
+	}
+
+	/*
+	 * Clear out the exact-match table
+	 */
+
+	port = s->sbm_base + R_MAC_ADDR_BASE;
+	for (idx = 0; idx < MAC_ADDR_COUNT; idx++) {
+		__raw_writeq(0, port);
+		port += sizeof(uint64_t);
+	}
+
+	/*
+	 * Clear out the DMA Channel mapping table registers
+	 */
+
+	port = s->sbm_base + R_MAC_CHUP0_BASE;
+	for (idx = 0; idx < MAC_CHMAP_COUNT; idx++) {
+		__raw_writeq(0, port);
+		port += sizeof(uint64_t);
+	}
+
+
+	port = s->sbm_base + R_MAC_CHLO0_BASE;
+	for (idx = 0; idx < MAC_CHMAP_COUNT; idx++) {
+		__raw_writeq(0, port);
+		port += sizeof(uint64_t);
+	}
+
+	/*
+	 * Program the hardware address.  It goes into the hardware-address
+	 * register as well as the first filter register.
+	 */
+
+	reg = sbmac_addr2reg(s->sbm_hwaddr);
+
+	port = s->sbm_base + R_MAC_ADDR_BASE;
+	__raw_writeq(reg, port);
+	port = s->sbm_base + R_MAC_ETHERNET_ADDR;
+
+#ifdef CONFIG_SB1_PASS_1_WORKAROUNDS
+	/*
+	 * Pass1 SOCs do not receive packets addressed to the
+	 * destination address in the R_MAC_ETHERNET_ADDR register.
+	 * Set the value to zero.
+	 */
+	__raw_writeq(0, port);
+#else
+	__raw_writeq(reg, port);
+#endif
+
+	/*
+	 * Set the receive filter for no packets, and write values
+	 * to the various config registers
+	 */
+
+	__raw_writeq(0, s->sbm_rxfilter);
+	__raw_writeq(0, s->sbm_imr);
+	__raw_writeq(framecfg, s->sbm_framecfg);
+	__raw_writeq(fifo, s->sbm_fifocfg);
+	__raw_writeq(cfg, s->sbm_maccfg);
+
+	/*
+	 * Initialize DMA channels (rings should be ok now)
+	 */
+
+	sbdma_channel_start(&(s->sbm_rxdma), DMA_RX);
+	sbdma_channel_start(&(s->sbm_txdma), DMA_TX);
+
+	/*
+	 * Configure the speed, duplex, and flow control
+	 */
+
+	sbmac_set_speed(s,s->sbm_speed);
+	sbmac_set_duplex(s,s->sbm_duplex,s->sbm_fc);
+
+	/*
+	 * Fill the receive ring
+	 */
+
+	sbdma_fillring(s, &(s->sbm_rxdma));
+
+	/*
+	 * Turn on the rest of the bits in the enable register
+	 */
+
+#if defined(CONFIG_SIBYTE_BCM1x55) || defined(CONFIG_SIBYTE_BCM1x80)
+	__raw_writeq(M_MAC_RXDMA_EN0 |
+		       M_MAC_TXDMA_EN0, s->sbm_macenable);
+#elif defined(CONFIG_SIBYTE_SB1250) || defined(CONFIG_SIBYTE_BCM112X)
+	__raw_writeq(M_MAC_RXDMA_EN0 |
+		       M_MAC_TXDMA_EN0 |
+		       M_MAC_RX_ENABLE |
+		       M_MAC_TX_ENABLE, s->sbm_macenable);
+#else
+#error invalid SiByte MAC configuration
+#endif
+
+#ifdef CONFIG_SBMAC_COALESCE
+	__raw_writeq(((M_MAC_INT_EOP_COUNT | M_MAC_INT_EOP_TIMER) << S_MAC_TX_CH0) |
+		       ((M_MAC_INT_EOP_COUNT | M_MAC_INT_EOP_TIMER) << S_MAC_RX_CH0), s->sbm_imr);
+#else
+	__raw_writeq((M_MAC_INT_CHANNEL << S_MAC_TX_CH0) |
+		       (M_MAC_INT_CHANNEL << S_MAC_RX_CH0), s->sbm_imr);
+#endif
+
+	/*
+	 * Enable receiving unicasts and broadcasts
+	 */
+
+	__raw_writeq(M_MAC_UCAST_EN | M_MAC_BCAST_EN, s->sbm_rxfilter);
+
+	/*
+	 * we're running now.
+	 */
+
+	s->sbm_state = sbmac_state_on;
+
+	/*
+	 * Program multicast addresses
+	 */
+
+	sbmac_setmulti(s);
+
+	/*
+	 * If channel was in promiscuous mode before, turn that on
+	 */
+
+	if (s->sbm_devflags & IFF_PROMISC) {
+		sbmac_promiscuous_mode(s,1);
+	}
+
+}
+
+
+/**********************************************************************
+ *  SBMAC_CHANNEL_STOP(s)
+ *
+ *  Stop packet processing on this MAC.
+ *
+ *  Input parameters:
+ *  	   s - sbmac structure
+ *
+ *  Return value:
+ *  	   nothing
+ ********************************************************************* */
+
+static void sbmac_channel_stop(struct sbmac_softc *s)
+{
+	/* don't do this if already stopped */
+
+	if (s->sbm_state == sbmac_state_off)
+		return;
+
+	/* don't accept any packets, disable all interrupts */
+
+	__raw_writeq(0, s->sbm_rxfilter);
+	__raw_writeq(0, s->sbm_imr);
+
+	/* Turn off ticker */
+
+	/* XXX */
+
+	/* turn off receiver and transmitter */
+
+	__raw_writeq(0, s->sbm_macenable);
+
+	/* We're stopped now. */
+
+	s->sbm_state = sbmac_state_off;
+
+	/*
+	 * Stop DMA channels (rings should be ok now)
+	 */
+
+	sbdma_channel_stop(&(s->sbm_rxdma));
+	sbdma_channel_stop(&(s->sbm_txdma));
+
+	/* Empty the receive and transmit rings */
+
+	sbdma_emptyring(&(s->sbm_rxdma));
+	sbdma_emptyring(&(s->sbm_txdma));
+
+}
+
+/**********************************************************************
+ *  SBMAC_SET_CHANNEL_STATE(state)
+ *
+ *  Set the channel's state ON or OFF
+ *
+ *  Input parameters:
+ *  	   state - new state
+ *
+ *  Return value:
+ *  	   old state
+ ********************************************************************* */
+static enum sbmac_state sbmac_set_channel_state(struct sbmac_softc *sc,
+						enum sbmac_state state)
+{
+	enum sbmac_state oldstate = sc->sbm_state;
+
+	/*
+	 * If same as previous state, return
+	 */
+
+	if (state == oldstate) {
+		return oldstate;
+	}
+
+	/*
+	 * If new state is ON, turn channel on
+	 */
+
+	if (state == sbmac_state_on) {
+		sbmac_channel_start(sc);
+	}
+	else {
+		sbmac_channel_stop(sc);
+	}
+
+	/*
+	 * Return previous state
+	 */
+
+	return oldstate;
+}
+
+
+/**********************************************************************
+ *  SBMAC_PROMISCUOUS_MODE(sc,onoff)
+ *
+ *  Turn on or off promiscuous mode
+ *
+ *  Input parameters:
+ *  	   sc - softc
+ *      onoff - 1 to turn on, 0 to turn off
+ *
+ *  Return value:
+ *  	   nothing
+ ********************************************************************* */
+
+static void sbmac_promiscuous_mode(struct sbmac_softc *sc,int onoff)
+{
+	uint64_t reg;
+
+	if (sc->sbm_state != sbmac_state_on)
+		return;
+
+	if (onoff) {
+		reg = __raw_readq(sc->sbm_rxfilter);
+		reg |= M_MAC_ALLPKT_EN;
+		__raw_writeq(reg, sc->sbm_rxfilter);
+	}
+	else {
+		reg = __raw_readq(sc->sbm_rxfilter);
+		reg &= ~M_MAC_ALLPKT_EN;
+		__raw_writeq(reg, sc->sbm_rxfilter);
+	}
+}
+
+/**********************************************************************
+ *  SBMAC_SETIPHDR_OFFSET(sc,onoff)
+ *
+ *  Set the iphdr offset as 15 assuming ethernet encapsulation
+ *
+ *  Input parameters:
+ *  	   sc - softc
+ *
+ *  Return value:
+ *  	   nothing
+ ********************************************************************* */
+
+static void sbmac_set_iphdr_offset(struct sbmac_softc *sc)
+{
+	uint64_t reg;
+
+	/* Hard code the off set to 15 for now */
+	reg = __raw_readq(sc->sbm_rxfilter);
+	reg &= ~M_MAC_IPHDR_OFFSET | V_MAC_IPHDR_OFFSET(15);
+	__raw_writeq(reg, sc->sbm_rxfilter);
+
+	/* BCM1250 pass1 didn't have hardware checksum.  Everything
+	   later does.  */
+	if (soc_type == K_SYS_SOC_TYPE_BCM1250 && periph_rev < 2) {
+		sc->rx_hw_checksum = DISABLE;
+	} else {
+		sc->rx_hw_checksum = ENABLE;
+	}
+}
+
+
+/**********************************************************************
+ *  SBMAC_ADDR2REG(ptr)
+ *
+ *  Convert six bytes into the 64-bit register value that
+ *  we typically write into the SBMAC's address/mcast registers
+ *
+ *  Input parameters:
+ *  	   ptr - pointer to 6 bytes
+ *
+ *  Return value:
+ *  	   register value
+ ********************************************************************* */
+
+static uint64_t sbmac_addr2reg(unsigned char *ptr)
+{
+	uint64_t reg = 0;
+
+	ptr += 6;
+
+	reg |= (uint64_t) *(--ptr);
+	reg <<= 8;
+	reg |= (uint64_t) *(--ptr);
+	reg <<= 8;
+	reg |= (uint64_t) *(--ptr);
+	reg <<= 8;
+	reg |= (uint64_t) *(--ptr);
+	reg <<= 8;
+	reg |= (uint64_t) *(--ptr);
+	reg <<= 8;
+	reg |= (uint64_t) *(--ptr);
+
+	return reg;
+}
+
+
+/**********************************************************************
+ *  SBMAC_SET_SPEED(s,speed)
+ *
+ *  Configure LAN speed for the specified MAC.
+ *  Warning: must be called when MAC is off!
+ *
+ *  Input parameters:
+ *  	   s - sbmac structure
+ *  	   speed - speed to set MAC to (see enum sbmac_speed)
+ *
+ *  Return value:
+ *  	   1 if successful
+ *      0 indicates invalid parameters
+ ********************************************************************* */
+
+static int sbmac_set_speed(struct sbmac_softc *s, enum sbmac_speed speed)
+{
+	uint64_t cfg;
+	uint64_t framecfg;
+
+	/*
+	 * Save new current values
+	 */
+
+	s->sbm_speed = speed;
+
+	if (s->sbm_state == sbmac_state_on)
+		return 0;	/* save for next restart */
+
+	/*
+	 * Read current register values
+	 */
+
+	cfg = __raw_readq(s->sbm_maccfg);
+	framecfg = __raw_readq(s->sbm_framecfg);
+
+	/*
+	 * Mask out the stuff we want to change
+	 */
+
+	cfg &= ~(M_MAC_BURST_EN | M_MAC_SPEED_SEL);
+	framecfg &= ~(M_MAC_IFG_RX | M_MAC_IFG_TX | M_MAC_IFG_THRSH |
+		      M_MAC_SLOT_SIZE);
+
+	/*
+	 * Now add in the new bits
+	 */
+
+	switch (speed) {
+	case sbmac_speed_10:
+		framecfg |= V_MAC_IFG_RX_10 |
+			V_MAC_IFG_TX_10 |
+			K_MAC_IFG_THRSH_10 |
+			V_MAC_SLOT_SIZE_10;
+		cfg |= V_MAC_SPEED_SEL_10MBPS;
+		break;
+
+	case sbmac_speed_100:
+		framecfg |= V_MAC_IFG_RX_100 |
+			V_MAC_IFG_TX_100 |
+			V_MAC_IFG_THRSH_100 |
+			V_MAC_SLOT_SIZE_100;
+		cfg |= V_MAC_SPEED_SEL_100MBPS ;
+		break;
+
+	case sbmac_speed_1000:
+		framecfg |= V_MAC_IFG_RX_1000 |
+			V_MAC_IFG_TX_1000 |
+			V_MAC_IFG_THRSH_1000 |
+			V_MAC_SLOT_SIZE_1000;
+		cfg |= V_MAC_SPEED_SEL_1000MBPS | M_MAC_BURST_EN;
+		break;
+
+	default:
+		return 0;
+	}
+
+	/*
+	 * Send the bits back to the hardware
+	 */
+
+	__raw_writeq(framecfg, s->sbm_framecfg);
+	__raw_writeq(cfg, s->sbm_maccfg);
+
+	return 1;
+}
+
+/**********************************************************************
+ *  SBMAC_SET_DUPLEX(s,duplex,fc)
+ *
+ *  Set Ethernet duplex and flow control options for this MAC
+ *  Warning: must be called when MAC is off!
+ *
+ *  Input parameters:
+ *  	   s - sbmac structure
+ *  	   duplex - duplex setting (see enum sbmac_duplex)
+ *  	   fc - flow control setting (see enum sbmac_fc)
+ *
+ *  Return value:
+ *  	   1 if ok
+ *  	   0 if an invalid parameter combination was specified
+ ********************************************************************* */
+
+static int sbmac_set_duplex(struct sbmac_softc *s, enum sbmac_duplex duplex,
+			    enum sbmac_fc fc)
+{
+	uint64_t cfg;
+
+	/*
+	 * Save new current values
+	 */
+
+	s->sbm_duplex = duplex;
+	s->sbm_fc = fc;
+
+	if (s->sbm_state == sbmac_state_on)
+		return 0;	/* save for next restart */
+
+	/*
+	 * Read current register values
+	 */
+
+	cfg = __raw_readq(s->sbm_maccfg);
+
+	/*
+	 * Mask off the stuff we're about to change
+	 */
+
+	cfg &= ~(M_MAC_FC_SEL | M_MAC_FC_CMD | M_MAC_HDX_EN);
+
+
+	switch (duplex) {
+	case sbmac_duplex_half:
+		switch (fc) {
+		case sbmac_fc_disabled:
+			cfg |= M_MAC_HDX_EN | V_MAC_FC_CMD_DISABLED;
+			break;
+
+		case sbmac_fc_collision:
+			cfg |= M_MAC_HDX_EN | V_MAC_FC_CMD_ENABLED;
+			break;
+
+		case sbmac_fc_carrier:
+			cfg |= M_MAC_HDX_EN | V_MAC_FC_CMD_ENAB_FALSECARR;
+			break;
+
+		case sbmac_fc_frame:		/* not valid in half duplex */
+		default:			/* invalid selection */
+			return 0;
+		}
+		break;
+
+	case sbmac_duplex_full:
+		switch (fc) {
+		case sbmac_fc_disabled:
+			cfg |= V_MAC_FC_CMD_DISABLED;
+			break;
+
+		case sbmac_fc_frame:
+			cfg |= V_MAC_FC_CMD_ENABLED;
+			break;
+
+		case sbmac_fc_collision:	/* not valid in full duplex */
+		case sbmac_fc_carrier:		/* not valid in full duplex */
+		default:
+			return 0;
+		}
+		break;
+	default:
+		return 0;
+	}
+
+	/*
+	 * Send the bits back to the hardware
+	 */
+
+	__raw_writeq(cfg, s->sbm_maccfg);
+
+	return 1;
+}
+
+
+
+
+/**********************************************************************
+ *  SBMAC_INTR()
+ *
+ *  Interrupt handler for MAC interrupts
+ *
+ *  Input parameters:
+ *  	   MAC structure
+ *
+ *  Return value:
+ *  	   nothing
+ ********************************************************************* */
+static irqreturn_t sbmac_intr(int irq,void *dev_instance)
+{
+	struct net_device *dev = (struct net_device *) dev_instance;
+	struct sbmac_softc *sc = netdev_priv(dev);
+	uint64_t isr;
+	int handled = 0;
+
+	/*
+	 * Read the ISR (this clears the bits in the real
+	 * register, except for counter addr)
+	 */
+
+	isr = __raw_readq(sc->sbm_isr) & ~M_MAC_COUNTER_ADDR;
+
+	if (isr == 0)
+		return IRQ_RETVAL(0);
+	handled = 1;
+
+	/*
+	 * Transmits on channel 0
+	 */
+
+	if (isr & (M_MAC_INT_CHANNEL << S_MAC_TX_CH0))
+		sbdma_tx_process(sc,&(sc->sbm_txdma), 0);
+
+	if (isr & (M_MAC_INT_CHANNEL << S_MAC_RX_CH0)) {
+		if (napi_schedule_prep(&sc->napi)) {
+			__raw_writeq(0, sc->sbm_imr);
+			__napi_schedule(&sc->napi);
+			/* Depend on the exit from poll to reenable intr */
+		}
+		else {
+			/* may leave some packets behind */
+			sbdma_rx_process(sc,&(sc->sbm_rxdma),
+					 SBMAC_MAX_RXDESCR * 2, 0);
+		}
+	}
+	return IRQ_RETVAL(handled);
+}
+
+/**********************************************************************
+ *  SBMAC_START_TX(skb,dev)
+ *
+ *  Start output on the specified interface.  Basically, we
+ *  queue as many buffers as we can until the ring fills up, or
+ *  we run off the end of the queue, whichever comes first.
+ *
+ *  Input parameters:
+ *
+ *
+ *  Return value:
+ *  	   nothing
+ ********************************************************************* */
+static int sbmac_start_tx(struct sk_buff *skb, struct net_device *dev)
+{
+	struct sbmac_softc *sc = netdev_priv(dev);
+	unsigned long flags;
+
+	/* lock eth irq */
+	spin_lock_irqsave(&sc->sbm_lock, flags);
+
+	/*
+	 * Put the buffer on the transmit ring.  If we
+	 * don't have room, stop the queue.
+	 */
+
+	if (sbdma_add_txbuffer(&(sc->sbm_txdma),skb)) {
+		/* XXX save skb that we could not send */
+		netif_stop_queue(dev);
+		spin_unlock_irqrestore(&sc->sbm_lock, flags);
+
+		return NETDEV_TX_BUSY;
+	}
+
+	spin_unlock_irqrestore(&sc->sbm_lock, flags);
+
+	return NETDEV_TX_OK;
+}
+
+/**********************************************************************
+ *  SBMAC_SETMULTI(sc)
+ *
+ *  Reprogram the multicast table into the hardware, given
+ *  the list of multicasts associated with the interface
+ *  structure.
+ *
+ *  Input parameters:
+ *  	   sc - softc
+ *
+ *  Return value:
+ *  	   nothing
+ ********************************************************************* */
+
+static void sbmac_setmulti(struct sbmac_softc *sc)
+{
+	uint64_t reg;
+	void __iomem *port;
+	int idx;
+	struct netdev_hw_addr *ha;
+	struct net_device *dev = sc->sbm_dev;
+
+	/*
+	 * Clear out entire multicast table.  We do this by nuking
+	 * the entire hash table and all the direct matches except
+	 * the first one, which is used for our station address
+	 */
+
+	for (idx = 1; idx < MAC_ADDR_COUNT; idx++) {
+		port = sc->sbm_base + R_MAC_ADDR_BASE+(idx*sizeof(uint64_t));
+		__raw_writeq(0, port);
+	}
+
+	for (idx = 0; idx < MAC_HASH_COUNT; idx++) {
+		port = sc->sbm_base + R_MAC_HASH_BASE+(idx*sizeof(uint64_t));
+		__raw_writeq(0, port);
+	}
+
+	/*
+	 * Clear the filter to say we don't want any multicasts.
+	 */
+
+	reg = __raw_readq(sc->sbm_rxfilter);
+	reg &= ~(M_MAC_MCAST_INV | M_MAC_MCAST_EN);
+	__raw_writeq(reg, sc->sbm_rxfilter);
+
+	if (dev->flags & IFF_ALLMULTI) {
+		/*
+		 * Enable ALL multicasts.  Do this by inverting the
+		 * multicast enable bit.
+		 */
+		reg = __raw_readq(sc->sbm_rxfilter);
+		reg |= (M_MAC_MCAST_INV | M_MAC_MCAST_EN);
+		__raw_writeq(reg, sc->sbm_rxfilter);
+		return;
+	}
+
+
+	/*
+	 * Progam new multicast entries.  For now, only use the
+	 * perfect filter.  In the future we'll need to use the
+	 * hash filter if the perfect filter overflows
+	 */
+
+	/* XXX only using perfect filter for now, need to use hash
+	 * XXX if the table overflows */
+
+	idx = 1;		/* skip station address */
+	netdev_for_each_mc_addr(ha, dev) {
+		if (idx == MAC_ADDR_COUNT)
+			break;
+		reg = sbmac_addr2reg(ha->addr);
+		port = sc->sbm_base + R_MAC_ADDR_BASE+(idx * sizeof(uint64_t));
+		__raw_writeq(reg, port);
+		idx++;
+	}
+
+	/*
+	 * Enable the "accept multicast bits" if we programmed at least one
+	 * multicast.
+	 */
+
+	if (idx > 1) {
+		reg = __raw_readq(sc->sbm_rxfilter);
+		reg |= M_MAC_MCAST_EN;
+		__raw_writeq(reg, sc->sbm_rxfilter);
+	}
+}
+
+static int sb1250_change_mtu(struct net_device *_dev, int new_mtu)
+{
+	if (new_mtu >  ENET_PACKET_SIZE)
+		return -EINVAL;
+	_dev->mtu = new_mtu;
+	pr_info("changing the mtu to %d\n", new_mtu);
+	return 0;
+}
+
+static const struct net_device_ops sbmac_netdev_ops = {
+	.ndo_open		= sbmac_open,
+	.ndo_stop		= sbmac_close,
+	.ndo_start_xmit		= sbmac_start_tx,
+	.ndo_set_rx_mode	= sbmac_set_rx_mode,
+	.ndo_tx_timeout		= sbmac_tx_timeout,
+	.ndo_do_ioctl		= sbmac_mii_ioctl,
+	.ndo_change_mtu		= sb1250_change_mtu,
+	.ndo_validate_addr	= eth_validate_addr,
+	.ndo_set_mac_address	= eth_mac_addr,
+#ifdef CONFIG_NET_POLL_CONTROLLER
+	.ndo_poll_controller	= sbmac_netpoll,
+#endif
+};
+
+/**********************************************************************
+ *  SBMAC_INIT(dev)
+ *
+ *  Attach routine - init hardware and hook ourselves into linux
+ *
+ *  Input parameters:
+ *  	   dev - net_device structure
+ *
+ *  Return value:
+ *  	   status
+ ********************************************************************* */
+
+static int sbmac_init(struct platform_device *pldev, long long base)
+{
+	struct net_device *dev = dev_get_drvdata(&pldev->dev);
+	int idx = pldev->id;
+	struct sbmac_softc *sc = netdev_priv(dev);
+	unsigned char *eaddr;
+	uint64_t ea_reg;
+	int i;
+	int err;
+
+	sc->sbm_dev = dev;
+	sc->sbe_idx = idx;
+
+	eaddr = sc->sbm_hwaddr;
+
+	/*
+	 * Read the ethernet address.  The firmware left this programmed
+	 * for us in the ethernet address register for each mac.
+	 */
+
+	ea_reg = __raw_readq(sc->sbm_base + R_MAC_ETHERNET_ADDR);
+	__raw_writeq(0, sc->sbm_base + R_MAC_ETHERNET_ADDR);
+	for (i = 0; i < 6; i++) {
+		eaddr[i] = (uint8_t) (ea_reg & 0xFF);
+		ea_reg >>= 8;
+	}
+
+	for (i = 0; i < 6; i++) {
+		dev->dev_addr[i] = eaddr[i];
+	}
+
+	/*
+	 * Initialize context (get pointers to registers and stuff), then
+	 * allocate the memory for the descriptor tables.
+	 */
+
+	sbmac_initctx(sc);
+
+	/*
+	 * Set up Linux device callins
+	 */
+
+	spin_lock_init(&(sc->sbm_lock));
+
+	dev->netdev_ops = &sbmac_netdev_ops;
+	dev->watchdog_timeo = TX_TIMEOUT;
+
+	netif_napi_add(dev, &sc->napi, sbmac_poll, 16);
+
+	dev->irq		= UNIT_INT(idx);
+
+	/* This is needed for PASS2 for Rx H/W checksum feature */
+	sbmac_set_iphdr_offset(sc);
+
+	sc->mii_bus = mdiobus_alloc();
+	if (sc->mii_bus == NULL) {
+		err = -ENOMEM;
+		goto uninit_ctx;
+	}
+
+	sc->mii_bus->name = sbmac_mdio_string;
+	snprintf(sc->mii_bus->id, MII_BUS_ID_SIZE, "%x", idx);
+	sc->mii_bus->priv = sc;
+	sc->mii_bus->read = sbmac_mii_read;
+	sc->mii_bus->write = sbmac_mii_write;
+	sc->mii_bus->irq = sc->phy_irq;
+	for (i = 0; i < PHY_MAX_ADDR; ++i)
+		sc->mii_bus->irq[i] = SBMAC_PHY_INT;
+
+	sc->mii_bus->parent = &pldev->dev;
+	/*
+	 * Probe PHY address
+	 */
+	err = mdiobus_register(sc->mii_bus);
+	if (err) {
+		printk(KERN_ERR "%s: unable to register MDIO bus\n",
+		       dev->name);
+		goto free_mdio;
+	}
+	dev_set_drvdata(&pldev->dev, sc->mii_bus);
+
+	err = register_netdev(dev);
+	if (err) {
+		printk(KERN_ERR "%s.%d: unable to register netdev\n",
+		       sbmac_string, idx);
+		goto unreg_mdio;
+	}
+
+	pr_info("%s.%d: registered as %s\n", sbmac_string, idx, dev->name);
+
+	if (sc->rx_hw_checksum == ENABLE)
+		pr_info("%s: enabling TCP rcv checksum\n", dev->name);
+
+	/*
+	 * Display Ethernet address (this is called during the config
+	 * process so we need to finish off the config message that
+	 * was being displayed)
+	 */
+	pr_info("%s: SiByte Ethernet at 0x%08Lx, address: %pM\n",
+	       dev->name, base, eaddr);
+
+	return 0;
+unreg_mdio:
+	mdiobus_unregister(sc->mii_bus);
+	dev_set_drvdata(&pldev->dev, NULL);
+free_mdio:
+	mdiobus_free(sc->mii_bus);
+uninit_ctx:
+	sbmac_uninitctx(sc);
+	return err;
+}
+
+
+static int sbmac_open(struct net_device *dev)
+{
+	struct sbmac_softc *sc = netdev_priv(dev);
+	int err;
+
+	if (debug > 1)
+		pr_debug("%s: sbmac_open() irq %d.\n", dev->name, dev->irq);
+
+	/*
+	 * map/route interrupt (clear status first, in case something
+	 * weird is pending; we haven't initialized the mac registers
+	 * yet)
+	 */
+
+	__raw_readq(sc->sbm_isr);
+	err = request_irq(dev->irq, sbmac_intr, IRQF_SHARED, dev->name, dev);
+	if (err) {
+		printk(KERN_ERR "%s: unable to get IRQ %d\n", dev->name,
+		       dev->irq);
+		goto out_err;
+	}
+
+	sc->sbm_speed = sbmac_speed_none;
+	sc->sbm_duplex = sbmac_duplex_none;
+	sc->sbm_fc = sbmac_fc_none;
+	sc->sbm_pause = -1;
+	sc->sbm_link = 0;
+
+	/*
+	 * Attach to the PHY
+	 */
+	err = sbmac_mii_probe(dev);
+	if (err)
+		goto out_unregister;
+
+	/*
+	 * Turn on the channel
+	 */
+
+	sbmac_set_channel_state(sc,sbmac_state_on);
+
+	netif_start_queue(dev);
+
+	sbmac_set_rx_mode(dev);
+
+	phy_start(sc->phy_dev);
+
+	napi_enable(&sc->napi);
+
+	return 0;
+
+out_unregister:
+	free_irq(dev->irq, dev);
+out_err:
+	return err;
+}
+
+static int sbmac_mii_probe(struct net_device *dev)
+{
+	struct sbmac_softc *sc = netdev_priv(dev);
+	struct phy_device *phy_dev;
+	int i;
+
+	for (i = 0; i < PHY_MAX_ADDR; i++) {
+		phy_dev = sc->mii_bus->phy_map[i];
+		if (phy_dev)
+			break;
+	}
+	if (!phy_dev) {
+		printk(KERN_ERR "%s: no PHY found\n", dev->name);
+		return -ENXIO;
+	}
+
+	phy_dev = phy_connect(dev, dev_name(&phy_dev->dev), &sbmac_mii_poll, 0,
+			      PHY_INTERFACE_MODE_GMII);
+	if (IS_ERR(phy_dev)) {
+		printk(KERN_ERR "%s: could not attach to PHY\n", dev->name);
+		return PTR_ERR(phy_dev);
+	}
+
+	/* Remove any features not supported by the controller */
+	phy_dev->supported &= SUPPORTED_10baseT_Half |
+			      SUPPORTED_10baseT_Full |
+			      SUPPORTED_100baseT_Half |
+			      SUPPORTED_100baseT_Full |
+			      SUPPORTED_1000baseT_Half |
+			      SUPPORTED_1000baseT_Full |
+			      SUPPORTED_Autoneg |
+			      SUPPORTED_MII |
+			      SUPPORTED_Pause |
+			      SUPPORTED_Asym_Pause;
+	phy_dev->advertising = phy_dev->supported;
+
+	pr_info("%s: attached PHY driver [%s] (mii_bus:phy_addr=%s, irq=%d)\n",
+		dev->name, phy_dev->drv->name,
+		dev_name(&phy_dev->dev), phy_dev->irq);
+
+	sc->phy_dev = phy_dev;
+
+	return 0;
+}
+
+
+static void sbmac_mii_poll(struct net_device *dev)
+{
+	struct sbmac_softc *sc = netdev_priv(dev);
+	struct phy_device *phy_dev = sc->phy_dev;
+	unsigned long flags;
+	enum sbmac_fc fc;
+	int link_chg, speed_chg, duplex_chg, pause_chg, fc_chg;
+
+	link_chg = (sc->sbm_link != phy_dev->link);
+	speed_chg = (sc->sbm_speed != phy_dev->speed);
+	duplex_chg = (sc->sbm_duplex != phy_dev->duplex);
+	pause_chg = (sc->sbm_pause != phy_dev->pause);
+
+	if (!link_chg && !speed_chg && !duplex_chg && !pause_chg)
+		return;					/* Hmmm... */
+
+	if (!phy_dev->link) {
+		if (link_chg) {
+			sc->sbm_link = phy_dev->link;
+			sc->sbm_speed = sbmac_speed_none;
+			sc->sbm_duplex = sbmac_duplex_none;
+			sc->sbm_fc = sbmac_fc_disabled;
+			sc->sbm_pause = -1;
+			pr_info("%s: link unavailable\n", dev->name);
+		}
+		return;
+	}
+
+	if (phy_dev->duplex == DUPLEX_FULL) {
+		if (phy_dev->pause)
+			fc = sbmac_fc_frame;
+		else
+			fc = sbmac_fc_disabled;
+	} else
+		fc = sbmac_fc_collision;
+	fc_chg = (sc->sbm_fc != fc);
+
+	pr_info("%s: link available: %dbase-%cD\n", dev->name, phy_dev->speed,
+		phy_dev->duplex == DUPLEX_FULL ? 'F' : 'H');
+
+	spin_lock_irqsave(&sc->sbm_lock, flags);
+
+	sc->sbm_speed = phy_dev->speed;
+	sc->sbm_duplex = phy_dev->duplex;
+	sc->sbm_fc = fc;
+	sc->sbm_pause = phy_dev->pause;
+	sc->sbm_link = phy_dev->link;
+
+	if ((speed_chg || duplex_chg || fc_chg) &&
+	    sc->sbm_state != sbmac_state_off) {
+		/*
+		 * something changed, restart the channel
+		 */
+		if (debug > 1)
+			pr_debug("%s: restarting channel "
+				 "because PHY state changed\n", dev->name);
+		sbmac_channel_stop(sc);
+		sbmac_channel_start(sc);
+	}
+
+	spin_unlock_irqrestore(&sc->sbm_lock, flags);
+}
+
+
+static void sbmac_tx_timeout (struct net_device *dev)
+{
+	struct sbmac_softc *sc = netdev_priv(dev);
+	unsigned long flags;
+
+	spin_lock_irqsave(&sc->sbm_lock, flags);
+
+
+	dev->trans_start = jiffies; /* prevent tx timeout */
+	dev->stats.tx_errors++;
+
+	spin_unlock_irqrestore(&sc->sbm_lock, flags);
+
+	printk (KERN_WARNING "%s: Transmit timed out\n",dev->name);
+}
+
+
+
+
+static void sbmac_set_rx_mode(struct net_device *dev)
+{
+	unsigned long flags;
+	struct sbmac_softc *sc = netdev_priv(dev);
+
+	spin_lock_irqsave(&sc->sbm_lock, flags);
+	if ((dev->flags ^ sc->sbm_devflags) & IFF_PROMISC) {
+		/*
+		 * Promiscuous changed.
+		 */
+
+		if (dev->flags & IFF_PROMISC) {
+			sbmac_promiscuous_mode(sc,1);
+		}
+		else {
+			sbmac_promiscuous_mode(sc,0);
+		}
+	}
+	spin_unlock_irqrestore(&sc->sbm_lock, flags);
+
+	/*
+	 * Program the multicasts.  Do this every time.
+	 */
+
+	sbmac_setmulti(sc);
+
+}
+
+static int sbmac_mii_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
+{
+	struct sbmac_softc *sc = netdev_priv(dev);
+
+	if (!netif_running(dev) || !sc->phy_dev)
+		return -EINVAL;
+
+	return phy_mii_ioctl(sc->phy_dev, rq, cmd);
+}
+
+static int sbmac_close(struct net_device *dev)
+{
+	struct sbmac_softc *sc = netdev_priv(dev);
+
+	napi_disable(&sc->napi);
+
+	phy_stop(sc->phy_dev);
+
+	sbmac_set_channel_state(sc, sbmac_state_off);
+
+	netif_stop_queue(dev);
+
+	if (debug > 1)
+		pr_debug("%s: Shutting down ethercard\n", dev->name);
+
+	phy_disconnect(sc->phy_dev);
+	sc->phy_dev = NULL;
+	free_irq(dev->irq, dev);
+
+	sbdma_emptyring(&(sc->sbm_txdma));
+	sbdma_emptyring(&(sc->sbm_rxdma));
+
+	return 0;
+}
+
+static int sbmac_poll(struct napi_struct *napi, int budget)
+{
+	struct sbmac_softc *sc = container_of(napi, struct sbmac_softc, napi);
+	int work_done;
+
+	work_done = sbdma_rx_process(sc, &(sc->sbm_rxdma), budget, 1);
+	sbdma_tx_process(sc, &(sc->sbm_txdma), 1);
+
+	if (work_done < budget) {
+		napi_complete(napi);
+
+#ifdef CONFIG_SBMAC_COALESCE
+		__raw_writeq(((M_MAC_INT_EOP_COUNT | M_MAC_INT_EOP_TIMER) << S_MAC_TX_CH0) |
+			     ((M_MAC_INT_EOP_COUNT | M_MAC_INT_EOP_TIMER) << S_MAC_RX_CH0),
+			     sc->sbm_imr);
+#else
+		__raw_writeq((M_MAC_INT_CHANNEL << S_MAC_TX_CH0) |
+			     (M_MAC_INT_CHANNEL << S_MAC_RX_CH0), sc->sbm_imr);
+#endif
+	}
+
+	return work_done;
+}
+
+
+static int __devinit sbmac_probe(struct platform_device *pldev)
+{
+	struct net_device *dev;
+	struct sbmac_softc *sc;
+	void __iomem *sbm_base;
+	struct resource *res;
+	u64 sbmac_orig_hwaddr;
+	int err;
+
+	res = platform_get_resource(pldev, IORESOURCE_MEM, 0);
+	BUG_ON(!res);
+	sbm_base = ioremap_nocache(res->start, resource_size(res));
+	if (!sbm_base) {
+		printk(KERN_ERR "%s: unable to map device registers\n",
+		       dev_name(&pldev->dev));
+		err = -ENOMEM;
+		goto out_out;
+	}
+
+	/*
+	 * The R_MAC_ETHERNET_ADDR register will be set to some nonzero
+	 * value for us by the firmware if we're going to use this MAC.
+	 * If we find a zero, skip this MAC.
+	 */
+	sbmac_orig_hwaddr = __raw_readq(sbm_base + R_MAC_ETHERNET_ADDR);
+	pr_debug("%s: %sconfiguring MAC at 0x%08Lx\n", dev_name(&pldev->dev),
+		 sbmac_orig_hwaddr ? "" : "not ", (long long)res->start);
+	if (sbmac_orig_hwaddr == 0) {
+		err = 0;
+		goto out_unmap;
+	}
+
+	/*
+	 * Okay, cool.  Initialize this MAC.
+	 */
+	dev = alloc_etherdev(sizeof(struct sbmac_softc));
+	if (!dev) {
+		printk(KERN_ERR "%s: unable to allocate etherdev\n",
+		       dev_name(&pldev->dev));
+		err = -ENOMEM;
+		goto out_unmap;
+	}
+
+	dev_set_drvdata(&pldev->dev, dev);
+	SET_NETDEV_DEV(dev, &pldev->dev);
+
+	sc = netdev_priv(dev);
+	sc->sbm_base = sbm_base;
+
+	err = sbmac_init(pldev, res->start);
+	if (err)
+		goto out_kfree;
+
+	return 0;
+
+out_kfree:
+	free_netdev(dev);
+	__raw_writeq(sbmac_orig_hwaddr, sbm_base + R_MAC_ETHERNET_ADDR);
+
+out_unmap:
+	iounmap(sbm_base);
+
+out_out:
+	return err;
+}
+
+static int __exit sbmac_remove(struct platform_device *pldev)
+{
+	struct net_device *dev = dev_get_drvdata(&pldev->dev);
+	struct sbmac_softc *sc = netdev_priv(dev);
+
+	unregister_netdev(dev);
+	sbmac_uninitctx(sc);
+	mdiobus_unregister(sc->mii_bus);
+	mdiobus_free(sc->mii_bus);
+	iounmap(sc->sbm_base);
+	free_netdev(dev);
+
+	return 0;
+}
+
+static struct platform_driver sbmac_driver = {
+	.probe = sbmac_probe,
+	.remove = __exit_p(sbmac_remove),
+	.driver = {
+		.name = sbmac_string,
+		.owner  = THIS_MODULE,
+	},
+};
+
+static int __init sbmac_init_module(void)
+{
+	return platform_driver_register(&sbmac_driver);
+}
+
+static void __exit sbmac_cleanup_module(void)
+{
+	platform_driver_unregister(&sbmac_driver);
+}
+
+module_init(sbmac_init_module);
+module_exit(sbmac_cleanup_module);