Linux-2.6.12-rc2

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

Let it rip!

1 files changed, 2920 insertions, 0 deletions

diff --git a/drivers/net/sb1250-mac.c b/drivers/net/sb1250-mac.c
new file mode 100644
index 000000000000..fd2e7c374906
--- /dev/null
+++ b/drivers/net/sb1250-mac.c
@@ -0,0 +1,2920 @@
+/*
+ * Copyright (C) 2001,2002,2003 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ *
+ *
+ * This driver is designed for the Broadcom SiByte SOC built-in
+ * Ethernet controllers. Written by Mitch Lichtenberg at Broadcom Corp.
+ */
+#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/config.h>
+#include <linux/bitops.h>
+#include <asm/processor.h>		/* Processor type for cache alignment. */
+#include <asm/io.h>
+#include <asm/cache.h>
+
+/* This is only here until the firmware is ready.  In that case,
+   the firmware leaves the ethernet address in the register for us. */
+#ifdef CONFIG_SIBYTE_STANDALONE
+#define SBMAC_ETH0_HWADDR "40:00:00:00:01:00"
+#define SBMAC_ETH1_HWADDR "40:00:00:00:01:01"
+#define SBMAC_ETH2_HWADDR "40:00:00:00:01:02"
+#endif
+
+
+/* These identify the driver base version and may not be removed. */
+#if 0
+static char version1[] __devinitdata =
+"sb1250-mac.c:1.00 1/11/2001 Written by Mitch Lichtenberg\n";
+#endif
+
+
+/* Operational parameters that usually are not changed. */
+
+#define CONFIG_SBMAC_COALESCE
+
+#define MAX_UNITS 3		/* More are supported, limit only on options */
+
+/* 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");
+
+/* mii status msgs */
+static int noisy_mii = 1;
+module_param(noisy_mii, int, S_IRUGO);
+MODULE_PARM_DESC(noisy_mii, "MII status messages");
+
+/* Used to pass the media type, etc.
+   Both 'options[]' and 'full_duplex[]' should exist for driver
+   interoperability.
+   The media type is usually passed in 'options[]'.
+*/
+#ifdef MODULE
+static int options[MAX_UNITS] = {-1, -1, -1};
+module_param_array(options, int, NULL, S_IRUGO);
+MODULE_PARM_DESC(options, "1-" __MODULE_STRING(MAX_UNITS));
+
+static int full_duplex[MAX_UNITS] = {-1, -1, -1};
+module_param_array(full_duplex, int, NULL, S_IRUGO);
+MODULE_PARM_DESC(full_duplex, "1-" __MODULE_STRING(MAX_UNITS));
+#endif
+
+#ifdef CONFIG_SBMAC_COALESCE
+static int int_pktcnt = 0;
+module_param(int_pktcnt, int, S_IRUGO);
+MODULE_PARM_DESC(int_pktcnt, "Packet count");
+
+static int int_timeout = 0;
+module_param(int_timeout, int, S_IRUGO);
+MODULE_PARM_DESC(int_timeout, "Timeout value");
+#endif
+
+#include <asm/sibyte/sb1250.h>
+#include <asm/sibyte/sb1250_defs.h>
+#include <asm/sibyte/sb1250_regs.h>
+#include <asm/sibyte/sb1250_mac.h>
+#include <asm/sibyte/sb1250_dma.h>
+#include <asm/sibyte/sb1250_int.h>
+#include <asm/sibyte/sb1250_scd.h>
+
+
+/**********************************************************************
+ *  Simple types
+ ********************************************************************* */
+
+
+typedef unsigned long sbmac_port_t;
+
+typedef enum { sbmac_speed_auto, sbmac_speed_10,
+	       sbmac_speed_100, sbmac_speed_1000 } sbmac_speed_t;
+
+typedef enum { sbmac_duplex_auto, sbmac_duplex_half,
+	       sbmac_duplex_full } sbmac_duplex_t;
+
+typedef enum { sbmac_fc_auto, sbmac_fc_disabled, sbmac_fc_frame,
+	       sbmac_fc_collision, sbmac_fc_carrier } sbmac_fc_t;
+
+typedef enum { sbmac_state_uninit, sbmac_state_off, sbmac_state_on, 
+	       sbmac_state_broken } sbmac_state_t;
+
+
+/**********************************************************************
+ *  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_READCSR(t)	__raw_readq((unsigned long)t)
+#define SBMAC_WRITECSR(t,v)	__raw_writeq(v, (unsigned long)t)
+ 
+
+#define SBMAC_MAX_TXDESCR	32
+#define SBMAC_MAX_RXDESCR	32
+
+#define ETHER_ALIGN	2
+#define ETHER_ADDR_LEN	6
+#define ENET_PACKET_SIZE	1518 
+/*#define ENET_PACKET_SIZE	9216 */ 
+
+/**********************************************************************
+ *  DMA Descriptor structure
+ ********************************************************************* */
+
+typedef struct sbdmadscr_s {
+	uint64_t  dscr_a;
+	uint64_t  dscr_b;
+} sbdmadscr_t;
+
+typedef unsigned long paddr_t;
+
+/**********************************************************************
+ *  DMA Controller structure
+ ********************************************************************* */
+
+typedef struct sbmacdma_s {
+	
+	/* 
+	 * 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
+
+	sbmac_port_t     sbdma_config0;	/* DMA config register 0 */
+	sbmac_port_t     sbdma_config1;	/* DMA config register 1 */
+	sbmac_port_t     sbdma_dscrbase;	/* Descriptor base address */
+	sbmac_port_t     sbdma_dscrcnt;     /* Descriptor count register */
+	sbmac_port_t     sbdma_curdscr;	/* current descriptor address */
+	
+	/*
+	 * This stuff is for maintenance of the ring
+	 */
+	
+	sbdmadscr_t     *sbdma_dscrtable;	/* base of descriptor table */
+	sbdmadscr_t     *sbdma_dscrtable_end; /* end of descriptor table */
+	
+	struct sk_buff **sbdma_ctxtable;    /* context table, one per descr */
+	
+	paddr_t          sbdma_dscrtable_phys; /* and also the phys addr */
+	sbdmadscr_t     *sbdma_addptr;	/* next dscr for sw to add */
+	sbdmadscr_t     *sbdma_remptr;	/* next dscr for sw to remove */
+} sbmacdma_t;
+
+
+/**********************************************************************
+ *  Ethernet softc structure
+ ********************************************************************* */
+
+struct sbmac_softc {
+	
+	/*
+	 * Linux-specific things
+	 */
+	
+	struct net_device *sbm_dev;		/* pointer to linux device */
+	spinlock_t sbm_lock;		/* spin lock */
+	struct timer_list sbm_timer;     	/* for monitoring MII */
+	struct net_device_stats sbm_stats; 
+	int sbm_devflags;			/* current device flags */
+
+	int	     sbm_phy_oldbmsr;
+	int	     sbm_phy_oldanlpar;
+	int	     sbm_phy_oldk1stsr;
+	int	     sbm_phy_oldlinkstat;
+	int sbm_buffersize;
+	
+	unsigned char sbm_phys[2];
+	
+	/*
+	 * Controller-specific things
+	 */
+	
+	unsigned long	sbm_base;          /* MAC's base address */
+	sbmac_state_t    sbm_state;         /* current state */
+	
+	sbmac_port_t     sbm_macenable;	/* MAC Enable Register */
+	sbmac_port_t     sbm_maccfg;	/* MAC Configuration Register */
+	sbmac_port_t     sbm_fifocfg;	/* FIFO configuration register */
+	sbmac_port_t     sbm_framecfg;	/* Frame configuration register */
+	sbmac_port_t     sbm_rxfilter;	/* receive filter register */
+	sbmac_port_t     sbm_isr;		/* Interrupt status register */
+	sbmac_port_t     sbm_imr;		/* Interrupt mask register */
+	sbmac_port_t     sbm_mdio;		/* MDIO register */
+	
+	sbmac_speed_t    sbm_speed;		/* current speed */
+	sbmac_duplex_t   sbm_duplex;	/* current duplex */
+	sbmac_fc_t       sbm_fc;		/* current flow control setting */
+	
+	unsigned char    sbm_hwaddr[ETHER_ADDR_LEN];
+	
+	sbmacdma_t       sbm_txdma;		/* for now, only use channel 0 */
+	sbmacdma_t       sbm_rxdma;
+	int              rx_hw_checksum;
+	int 		 sbe_idx;
+};
+
+
+/**********************************************************************
+ *  Externs
+ ********************************************************************* */
+
+/**********************************************************************
+ *  Prototypes
+ ********************************************************************* */
+
+static void sbdma_initctx(sbmacdma_t *d,
+			  struct sbmac_softc *s,
+			  int chan,
+			  int txrx,
+			  int maxdescr);
+static void sbdma_channel_start(sbmacdma_t *d, int rxtx);
+static int sbdma_add_rcvbuffer(sbmacdma_t *d,struct sk_buff *m);
+static int sbdma_add_txbuffer(sbmacdma_t *d,struct sk_buff *m);
+static void sbdma_emptyring(sbmacdma_t *d);
+static void sbdma_fillring(sbmacdma_t *d);
+static void sbdma_rx_process(struct sbmac_softc *sc,sbmacdma_t *d);
+static void sbdma_tx_process(struct sbmac_softc *sc,sbmacdma_t *d);
+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 sbmac_state_t sbmac_set_channel_state(struct sbmac_softc *,sbmac_state_t);
+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,struct pt_regs *rgs);
+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 net_device *dev, int idx);
+static int sbmac_set_speed(struct sbmac_softc *s,sbmac_speed_t speed);
+static int sbmac_set_duplex(struct sbmac_softc *s,sbmac_duplex_t duplex,sbmac_fc_t fc);
+
+static int sbmac_open(struct net_device *dev);
+static void sbmac_timer(unsigned long data);
+static void sbmac_tx_timeout (struct net_device *dev);
+static struct net_device_stats *sbmac_get_stats(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_mii_poll(struct sbmac_softc *s,int noisy);
+
+static void sbmac_mii_sync(struct sbmac_softc *s);
+static void sbmac_mii_senddata(struct sbmac_softc *s,unsigned int data, int bitcnt);
+static unsigned int sbmac_mii_read(struct sbmac_softc *s,int phyaddr,int regidx);
+static void sbmac_mii_write(struct sbmac_softc *s,int phyaddr,int regidx,
+			    unsigned int regval);
+
+
+/**********************************************************************
+ *  Globals
+ ********************************************************************* */
+
+static uint64_t sbmac_orig_hwaddr[MAX_UNITS];
+
+
+/**********************************************************************
+ *  MDIO constants
+ ********************************************************************* */
+
+#define	MII_COMMAND_START	0x01
+#define	MII_COMMAND_READ	0x02
+#define	MII_COMMAND_WRITE	0x01
+#define	MII_COMMAND_ACK		0x02
+
+#define BMCR_RESET     0x8000
+#define BMCR_LOOPBACK  0x4000
+#define BMCR_SPEED0    0x2000
+#define BMCR_ANENABLE  0x1000
+#define BMCR_POWERDOWN 0x0800
+#define BMCR_ISOLATE   0x0400
+#define BMCR_RESTARTAN 0x0200
+#define BMCR_DUPLEX    0x0100
+#define BMCR_COLTEST   0x0080
+#define BMCR_SPEED1    0x0040
+#define BMCR_SPEED1000	BMCR_SPEED1
+#define BMCR_SPEED100	BMCR_SPEED0
+#define BMCR_SPEED10 	0
+
+#define BMSR_100BT4	0x8000
+#define BMSR_100BT_FDX	0x4000
+#define BMSR_100BT_HDX  0x2000
+#define BMSR_10BT_FDX   0x1000
+#define BMSR_10BT_HDX   0x0800
+#define BMSR_100BT2_FDX 0x0400
+#define BMSR_100BT2_HDX 0x0200
+#define BMSR_1000BT_XSR	0x0100
+#define BMSR_PRESUP	0x0040
+#define BMSR_ANCOMPLT	0x0020
+#define BMSR_REMFAULT	0x0010
+#define BMSR_AUTONEG	0x0008
+#define BMSR_LINKSTAT	0x0004
+#define BMSR_JABDETECT	0x0002
+#define BMSR_EXTCAPAB	0x0001
+
+#define PHYIDR1 	0x2000
+#define PHYIDR2		0x5C60
+
+#define ANAR_NP		0x8000
+#define ANAR_RF		0x2000
+#define ANAR_ASYPAUSE	0x0800
+#define ANAR_PAUSE	0x0400
+#define ANAR_T4		0x0200
+#define ANAR_TXFD	0x0100
+#define ANAR_TXHD	0x0080
+#define ANAR_10FD	0x0040
+#define ANAR_10HD	0x0020
+#define ANAR_PSB	0x0001
+
+#define ANLPAR_NP	0x8000
+#define ANLPAR_ACK	0x4000
+#define ANLPAR_RF	0x2000
+#define ANLPAR_ASYPAUSE	0x0800
+#define ANLPAR_PAUSE	0x0400
+#define ANLPAR_T4	0x0200
+#define ANLPAR_TXFD	0x0100
+#define ANLPAR_TXHD	0x0080
+#define ANLPAR_10FD	0x0040
+#define ANLPAR_10HD	0x0020
+#define ANLPAR_PSB	0x0001	/* 802.3 */
+
+#define ANER_PDF	0x0010
+#define ANER_LPNPABLE	0x0008
+#define ANER_NPABLE	0x0004
+#define ANER_PAGERX	0x0002
+#define ANER_LPANABLE	0x0001
+
+#define ANNPTR_NP	0x8000
+#define ANNPTR_MP	0x2000
+#define ANNPTR_ACK2	0x1000
+#define ANNPTR_TOGTX	0x0800
+#define ANNPTR_CODE	0x0008
+
+#define ANNPRR_NP	0x8000
+#define ANNPRR_MP	0x2000
+#define ANNPRR_ACK3	0x1000
+#define ANNPRR_TOGTX	0x0800
+#define ANNPRR_CODE	0x0008
+
+#define K1TCR_TESTMODE	0x0000
+#define K1TCR_MSMCE	0x1000
+#define K1TCR_MSCV	0x0800
+#define K1TCR_RPTR	0x0400
+#define K1TCR_1000BT_FDX 0x200
+#define K1TCR_1000BT_HDX 0x100
+
+#define K1STSR_MSMCFLT	0x8000
+#define K1STSR_MSCFGRES	0x4000
+#define K1STSR_LRSTAT	0x2000
+#define K1STSR_RRSTAT	0x1000
+#define K1STSR_LP1KFD	0x0800
+#define K1STSR_LP1KHD   0x0400
+#define K1STSR_LPASMDIR	0x0200
+
+#define K1SCR_1KX_FDX	0x8000
+#define K1SCR_1KX_HDX	0x4000
+#define K1SCR_1KT_FDX	0x2000
+#define K1SCR_1KT_HDX	0x1000
+
+#define STRAP_PHY1	0x0800
+#define STRAP_NCMODE	0x0400
+#define STRAP_MANMSCFG	0x0200
+#define STRAP_ANENABLE	0x0100
+#define STRAP_MSVAL	0x0080
+#define STRAP_1KHDXADV	0x0010
+#define STRAP_1KFDXADV	0x0008
+#define STRAP_100ADV	0x0004
+#define STRAP_SPEEDSEL	0x0000
+#define STRAP_SPEED100	0x0001
+
+#define PHYSUP_SPEED1000 0x10
+#define PHYSUP_SPEED100  0x08
+#define PHYSUP_SPEED10   0x00
+#define PHYSUP_LINKUP	 0x04
+#define PHYSUP_FDX       0x02
+
+#define	MII_BMCR	0x00 	/* Basic mode control register (rw) */
+#define	MII_BMSR	0x01	/* Basic mode status register (ro) */
+#define MII_K1STSR	0x0A	/* 1K Status Register (ro) */
+#define	MII_ANLPAR	0x05	/* Autonegotiation lnk partner abilities (rw) */
+
+
+#define M_MAC_MDIO_DIR_OUTPUT	0		/* for clarity */
+
+#define ENABLE 		1
+#define DISABLE		0
+
+/**********************************************************************
+ *  SBMAC_MII_SYNC(s)
+ *  
+ *  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: 
+ *  	   s - sbmac structure
+ *  	   
+ *  Return value:
+ *  	   nothing
+ ********************************************************************* */
+
+static void sbmac_mii_sync(struct sbmac_softc *s)
+{
+	int cnt;
+	uint64_t bits;
+	int mac_mdio_genc;
+
+	mac_mdio_genc = SBMAC_READCSR(s->sbm_mdio) & M_MAC_GENC;
+	
+	bits = M_MAC_MDIO_DIR_OUTPUT | M_MAC_MDIO_OUT;
+	
+	SBMAC_WRITECSR(s->sbm_mdio,bits | mac_mdio_genc);
+	
+	for (cnt = 0; cnt < 32; cnt++) {
+		SBMAC_WRITECSR(s->sbm_mdio,bits | M_MAC_MDC | mac_mdio_genc);
+		SBMAC_WRITECSR(s->sbm_mdio,bits | mac_mdio_genc);
+	}
+}
+
+/**********************************************************************
+ *  SBMAC_MII_SENDDATA(s,data,bitcnt)
+ *  
+ *  Send some bits to the MII.  The bits to be sent are right-
+ *  justified in the 'data' parameter.
+ *  
+ *  Input parameters: 
+ *  	   s - sbmac structure
+ *  	   data - data to send
+ *  	   bitcnt - number of bits to send
+ ********************************************************************* */
+
+static void sbmac_mii_senddata(struct sbmac_softc *s,unsigned int data, int bitcnt)
+{
+	int i;
+	uint64_t bits;
+	unsigned int curmask;
+	int mac_mdio_genc;
+
+	mac_mdio_genc = SBMAC_READCSR(s->sbm_mdio) & M_MAC_GENC;
+	
+	bits = M_MAC_MDIO_DIR_OUTPUT;
+	SBMAC_WRITECSR(s->sbm_mdio,bits | mac_mdio_genc);
+	
+	curmask = 1 << (bitcnt - 1);
+	
+	for (i = 0; i < bitcnt; i++) {
+		if (data & curmask)
+			bits |= M_MAC_MDIO_OUT;
+		else bits &= ~M_MAC_MDIO_OUT;
+		SBMAC_WRITECSR(s->sbm_mdio,bits | mac_mdio_genc);
+		SBMAC_WRITECSR(s->sbm_mdio,bits | M_MAC_MDC | mac_mdio_genc);
+		SBMAC_WRITECSR(s->sbm_mdio,bits | mac_mdio_genc);
+		curmask >>= 1;
+	}
+}
+
+
+
+/**********************************************************************
+ *  SBMAC_MII_READ(s,phyaddr,regidx)
+ *  
+ *  Read a PHY register.
+ *  
+ *  Input parameters: 
+ *  	   s - sbmac structure
+ *  	   phyaddr - PHY's address
+ *  	   regidx = index of register to read
+ *  	   
+ *  Return value:
+ *  	   value read, or 0 if an error occurred.
+ ********************************************************************* */
+
+static unsigned int sbmac_mii_read(struct sbmac_softc *s,int phyaddr,int regidx)
+{
+	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(s);
+	
+	/*
+	 * 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(s,MII_COMMAND_START, 2);
+	sbmac_mii_senddata(s,MII_COMMAND_READ, 2);
+	sbmac_mii_senddata(s,phyaddr, 5);
+	sbmac_mii_senddata(s,regidx, 5);
+	
+	mac_mdio_genc = SBMAC_READCSR(s->sbm_mdio) & M_MAC_GENC;
+	
+	/* 
+	 * Switch the port around without a clock transition.
+	 */
+	SBMAC_WRITECSR(s->sbm_mdio,M_MAC_MDIO_DIR_INPUT | mac_mdio_genc);
+	
+	/*
+	 * Send out a clock pulse to signal we want the status
+	 */
+	
+	SBMAC_WRITECSR(s->sbm_mdio,
+		       M_MAC_MDIO_DIR_INPUT | M_MAC_MDC | mac_mdio_genc);
+	SBMAC_WRITECSR(s->sbm_mdio,M_MAC_MDIO_DIR_INPUT | mac_mdio_genc);
+	
+	/* 
+	 * If an error occurred, the PHY will signal '1' back
+	 */
+	error = SBMAC_READCSR(s->sbm_mdio) & M_MAC_MDIO_IN;
+	
+	/* 
+	 * Issue an 'idle' clock pulse, but keep the direction
+	 * the same.
+	 */
+	SBMAC_WRITECSR(s->sbm_mdio,
+		       M_MAC_MDIO_DIR_INPUT | M_MAC_MDC | mac_mdio_genc);
+	SBMAC_WRITECSR(s->sbm_mdio,M_MAC_MDIO_DIR_INPUT | mac_mdio_genc);
+	
+	regval = 0;
+	
+	for (idx = 0; idx < 16; idx++) {
+		regval <<= 1;
+		
+		if (error == 0) {
+			if (SBMAC_READCSR(s->sbm_mdio) & M_MAC_MDIO_IN)
+				regval |= 1;
+		}
+		
+		SBMAC_WRITECSR(s->sbm_mdio,
+			       M_MAC_MDIO_DIR_INPUT|M_MAC_MDC | mac_mdio_genc);
+		SBMAC_WRITECSR(s->sbm_mdio,
+			       M_MAC_MDIO_DIR_INPUT | mac_mdio_genc);
+	}
+	
+	/* Switch back to output */
+	SBMAC_WRITECSR(s->sbm_mdio,M_MAC_MDIO_DIR_OUTPUT | mac_mdio_genc);
+	
+	if (error == 0)
+		return regval;
+	return 0;
+}
+
+
+/**********************************************************************
+ *  SBMAC_MII_WRITE(s,phyaddr,regidx,regval)
+ *  
+ *  Write a value to a PHY register.
+ *  
+ *  Input parameters: 
+ *  	   s - sbmac structure
+ *  	   phyaddr - PHY to use
+ *  	   regidx - register within the PHY
+ *  	   regval - data to write to register
+ *  	   
+ *  Return value:
+ *  	   nothing
+ ********************************************************************* */
+
+static void sbmac_mii_write(struct sbmac_softc *s,int phyaddr,int regidx,
+			    unsigned int regval)
+{
+	int mac_mdio_genc;
+
+	sbmac_mii_sync(s);
+	
+	sbmac_mii_senddata(s,MII_COMMAND_START,2);
+	sbmac_mii_senddata(s,MII_COMMAND_WRITE,2);
+	sbmac_mii_senddata(s,phyaddr, 5);
+	sbmac_mii_senddata(s,regidx, 5);
+	sbmac_mii_senddata(s,MII_COMMAND_ACK,2);
+	sbmac_mii_senddata(s,regval,16);
+
+	mac_mdio_genc = SBMAC_READCSR(s->sbm_mdio) & M_MAC_GENC;
+
+	SBMAC_WRITECSR(s->sbm_mdio,M_MAC_MDIO_DIR_OUTPUT | mac_mdio_genc);
+}
+
+
+
+/**********************************************************************
+ *  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 - sbmacdma_t structure (DMA channel context)
+ *  	   s - sbmac_softc structure (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(sbmacdma_t *d,
+			  struct sbmac_softc *s,
+			  int chan,
+			  int txrx,
+			  int maxdescr)
+{
+	/* 
+	 * 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
+
+	SBMAC_WRITECSR(IOADDR(
+	A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_TX_BYTES)), 0);
+	SBMAC_WRITECSR(IOADDR(
+	A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_COLLISIONS)), 0);
+	SBMAC_WRITECSR(IOADDR(
+	A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_LATE_COL)), 0);
+	SBMAC_WRITECSR(IOADDR(
+	A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_EX_COL)), 0);
+	SBMAC_WRITECSR(IOADDR(
+	A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_FCS_ERROR)), 0);
+	SBMAC_WRITECSR(IOADDR(
+	A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_TX_ABORT)), 0);
+	SBMAC_WRITECSR(IOADDR(
+	A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_TX_BAD)), 0);
+	SBMAC_WRITECSR(IOADDR(
+	A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_TX_GOOD)), 0);
+	SBMAC_WRITECSR(IOADDR(
+	A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_TX_RUNT)), 0);
+	SBMAC_WRITECSR(IOADDR(
+	A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_TX_OVERSIZE)), 0);
+	SBMAC_WRITECSR(IOADDR(
+	A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_RX_BYTES)), 0);
+	SBMAC_WRITECSR(IOADDR(
+	A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_RX_MCAST)), 0);
+	SBMAC_WRITECSR(IOADDR(
+	A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_RX_BCAST)), 0);
+	SBMAC_WRITECSR(IOADDR(
+	A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_RX_BAD)), 0);
+	SBMAC_WRITECSR(IOADDR(
+	A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_RX_GOOD)), 0);
+	SBMAC_WRITECSR(IOADDR(
+	A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_RX_RUNT)), 0);
+	SBMAC_WRITECSR(IOADDR(
+	A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_RX_OVERSIZE)), 0);
+	SBMAC_WRITECSR(IOADDR(
+	A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_RX_FCS_ERROR)), 0);
+	SBMAC_WRITECSR(IOADDR(
+	A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_RX_LENGTH_ERROR)), 0);
+	SBMAC_WRITECSR(IOADDR(
+	A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_RX_CODE_ERROR)), 0);
+	SBMAC_WRITECSR(IOADDR(
+	A_MAC_REGISTER(s->sbe_idx, R_MAC_RMON_RX_ALIGN_ERROR)), 0);
+
+	/* 
+	 * 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);
+	
+	/*
+	 * Allocate memory for the ring
+	 */
+	
+	d->sbdma_maxdescr = maxdescr;
+	
+	d->sbdma_dscrtable = (sbdmadscr_t *) 
+		kmalloc(d->sbdma_maxdescr*sizeof(sbdmadscr_t), GFP_KERNEL);
+	
+	memset(d->sbdma_dscrtable,0,d->sbdma_maxdescr*sizeof(sbdmadscr_t));
+	
+	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 = (struct sk_buff **) 
+		kmalloc(d->sbdma_maxdescr*sizeof(struct sk_buff *), GFP_KERNEL);
+	
+	memset(d->sbdma_ctxtable,0,d->sbdma_maxdescr*sizeof(struct sk_buff *));
+	
+#ifdef CONFIG_SBMAC_COALESCE
+	/*
+	 * Setup Rx/Tx DMA coalescing defaults
+	 */
+
+	if ( int_pktcnt ) {
+		d->sbdma_int_pktcnt = int_pktcnt;
+	} else {
+		d->sbdma_int_pktcnt = 1;
+	}
+	
+	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(sbmacdma_t *d, int rxtx )
+{
+	/*
+	 * Turn on the DMA channel
+	 */
+	
+#ifdef CONFIG_SBMAC_COALESCE
+	SBMAC_WRITECSR(d->sbdma_config1,
+		       V_DMA_INT_TIMEOUT(d->sbdma_int_timeout) |
+		       0);
+	SBMAC_WRITECSR(d->sbdma_config0,
+		       M_DMA_EOP_INT_EN |
+		       V_DMA_RINGSZ(d->sbdma_maxdescr) |
+		       V_DMA_INT_PKTCNT(d->sbdma_int_pktcnt) |
+		       0);
+#else
+	SBMAC_WRITECSR(d->sbdma_config1,0);
+	SBMAC_WRITECSR(d->sbdma_config0,
+		       V_DMA_RINGSZ(d->sbdma_maxdescr) |
+		       0);
+#endif
+
+	SBMAC_WRITECSR(d->sbdma_dscrbase,d->sbdma_dscrtable_phys);
+
+	/*
+	 * 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(sbmacdma_t *d)
+{
+	/*
+	 * Turn off the DMA channel
+	 */
+	
+	SBMAC_WRITECSR(d->sbdma_config1,0);
+	
+	SBMAC_WRITECSR(d->sbdma_dscrbase,0);
+	
+	SBMAC_WRITECSR(d->sbdma_config0,0);
+	
+	/*
+	 * Zero ring pointers
+	 */
+	
+	d->sbdma_addptr = 0;
+	d->sbdma_remptr = 0;
+}
+
+static void sbdma_align_skb(struct sk_buff *skb,int power2,int offset)
+{
+	unsigned long addr;
+	unsigned long newaddr;
+	
+	addr = (unsigned long) skb->data;
+	
+	newaddr = (addr + power2 - 1) & ~(power2 - 1);
+	
+	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: 
+ *  	   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(sbmacdma_t *d,struct sk_buff *sb)
+{
+	sbdmadscr_t *dsc;
+	sbdmadscr_t *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 = dev_alloc_skb(ENET_PACKET_SIZE + SMP_CACHE_BYTES * 2 + ETHER_ALIGN);
+		if (sb_new == NULL) {
+			printk(KERN_INFO "%s: sk_buff allocation failed\n",
+			       d->sbdma_eth->sbm_dev->name);
+			return -ENOBUFS;
+		}
+
+		sbdma_align_skb(sb_new, SMP_CACHE_BYTES, ETHER_ALIGN);
+
+		/* mark skbuff owned by our device */
+		sb_new->dev = d->sbdma_eth->sbm_dev;
+	}
+	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->tail) |
+		V_DMA_DSCRA_A_SIZE(NUMCACHEBLKS(pktsize+ETHER_ALIGN)) |
+		0;
+#else
+	dsc->dscr_a = virt_to_phys(sb_new->tail) |
+		V_DMA_DSCRA_A_SIZE(NUMCACHEBLKS(pktsize+ETHER_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.
+	 */
+	
+	SBMAC_WRITECSR(d->sbdma_dscrcnt,1);
+	
+	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(sbmacdma_t *d,struct sk_buff *sb)
+{
+	sbdmadscr_t *dsc;
+	sbdmadscr_t *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.
+	 */
+	
+	SBMAC_WRITECSR(d->sbdma_dscrcnt,1);
+	
+	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(sbmacdma_t *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: 
+ *  	   d - DMA channel
+ *  	   
+ *  Return value:
+ *  	   nothing
+ ********************************************************************* */
+
+static void sbdma_fillring(sbmacdma_t *d)
+{
+	int idx;
+	
+	for (idx = 0; idx < SBMAC_MAX_RXDESCR-1; idx++) {
+		if (sbdma_add_rcvbuffer(d,NULL) != 0)
+			break;
+	}
+}
+
+
+/**********************************************************************
+ *  SBDMA_RX_PROCESS(sc,d)
+ *  
+ *  Process "completed" receive buffers on the specified DMA channel.  
+ *  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
+ *  	   
+ *  Return value:
+ *  	   nothing
+ ********************************************************************* */
+
+static void sbdma_rx_process(struct sbmac_softc *sc,sbmacdma_t *d)
+{
+	int curidx;
+	int hwidx;
+	sbdmadscr_t *dsc;
+	struct sk_buff *sb;
+	int len;
+	
+	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;
+		hwidx = (int) (((SBMAC_READCSR(d->sbdma_curdscr) & M_DMA_CURDSCR_ADDR) -
+				d->sbdma_dscrtable_phys) / sizeof(sbdmadscr_t));
+		
+		/*
+		 * 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;
+		
+		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 (!(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 (sbdma_add_rcvbuffer(d,NULL) == -ENOBUFS) {
+				sc->sbm_stats.rx_dropped++;
+				sbdma_add_rcvbuffer(d,sb); /* re-add old buffer */
+			} else {
+				/*
+				 * Set length into the packet
+				 */
+				skb_put(sb,len);
+				
+				/*
+				 * Buffer has been replaced on the
+				 * receive ring.  Pass the buffer to
+				 * the kernel
+				 */
+				sc->sbm_stats.rx_bytes += len;
+				sc->sbm_stats.rx_packets++;
+				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 {
+						sb->ip_summed = CHECKSUM_NONE;
+					}
+				}
+				
+				netif_rx(sb);
+			}
+		} else {
+			/*
+			 * Packet was mangled somehow.  Just drop it and
+			 * put it back on the receive ring.
+			 */
+			sc->sbm_stats.rx_errors++;
+			sbdma_add_rcvbuffer(d,sb);
+		}
+		
+		
+		/* 
+		 * .. and advance to the next buffer.
+		 */
+		
+		d->sbdma_remptr = SBDMA_NEXTBUF(d,sbdma_remptr);
+		
+	}
+}
+
+
+
+/**********************************************************************
+ *  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
+ *  	   
+ *  Return value:
+ *  	   nothing
+ ********************************************************************* */
+
+static void sbdma_tx_process(struct sbmac_softc *sc,sbmacdma_t *d)
+{
+	int curidx;
+	int hwidx;
+	sbdmadscr_t *dsc;
+	struct sk_buff *sb;
+	unsigned long flags;
+
+	spin_lock_irqsave(&(sc->sbm_lock), flags);
+	
+	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;
+		hwidx = (int) (((SBMAC_READCSR(d->sbdma_curdscr) & M_DMA_CURDSCR_ADDR) -
+				d->sbdma_dscrtable_phys) / sizeof(sbdmadscr_t));
+
+		/*
+		 * 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
+		 */
+		
+		sc->sbm_stats.tx_bytes += sb->len;
+		sc->sbm_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);
+		
+	}
+	
+	/*
+	 * 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.
+	 */
+	
+	netif_wake_queue(d->sbdma_eth->sbm_dev);
+	
+	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;
+
+	s->sbm_phys[0]   = 1;
+	s->sbm_phys[1]   = 0;
+
+	s->sbm_phy_oldbmsr = 0;
+	s->sbm_phy_oldanlpar = 0;
+	s->sbm_phy_oldk1stsr = 0;
+	s->sbm_phy_oldlinkstat = 0;
+	
+	/*
+	 * 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;
+	
+	/*
+	 * Initial speed is (XXX TEMP) 10MBit/s HDX no FC
+	 */
+	
+	s->sbm_speed = sbmac_speed_10;
+	s->sbm_duplex = sbmac_duplex_half;
+	s->sbm_fc = sbmac_fc_disabled;
+	
+	return 0;
+}
+
+
+static void sbdma_uninitctx(struct sbmacdma_s *d)
+{
+	if (d->sbdma_dscrtable) {
+		kfree(d->sbdma_dscrtable);
+		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;
+	sbmac_port_t 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.
+	 */
+	
+	SBMAC_WRITECSR(s->sbm_macenable,0);
+	
+	/*
+	 * Ignore all received packets
+	 */
+	
+	SBMAC_WRITECSR(s->sbm_rxfilter,0);
+	
+	/* 
+	 * 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 (periph_rev >= 2) 
+		th_value = 64;
+	else 
+		th_value = 28;
+
+	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_PL_THRSH(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++) {
+		SBMAC_WRITECSR(port,0);
+		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++) {
+		SBMAC_WRITECSR(port,0);
+		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++) {
+		SBMAC_WRITECSR(port,0);
+		port += sizeof(uint64_t);
+	}
+
+
+	port = s->sbm_base + R_MAC_CHLO0_BASE;
+	for (idx = 0; idx < MAC_CHMAP_COUNT; idx++) {
+		SBMAC_WRITECSR(port,0);
+		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;
+	SBMAC_WRITECSR(port,reg);
+	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.
+	 */
+	SBMAC_WRITECSR(port,0);
+#else
+	SBMAC_WRITECSR(port,reg);
+#endif
+	
+	/*
+	 * Set the receive filter for no packets, and write values
+	 * to the various config registers
+	 */
+	
+	SBMAC_WRITECSR(s->sbm_rxfilter,0);
+	SBMAC_WRITECSR(s->sbm_imr,0);
+	SBMAC_WRITECSR(s->sbm_framecfg,framecfg);
+	SBMAC_WRITECSR(s->sbm_fifocfg,fifo);
+	SBMAC_WRITECSR(s->sbm_maccfg,cfg);
+	
+	/*
+	 * 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->sbm_rxdma));
+	
+	/* 
+	 * Turn on the rest of the bits in the enable register
+	 */      
+	
+	SBMAC_WRITECSR(s->sbm_macenable,
+		       M_MAC_RXDMA_EN0 |
+		       M_MAC_TXDMA_EN0 |
+		       M_MAC_RX_ENABLE |
+		       M_MAC_TX_ENABLE);
+	
+	
+
+
+#ifdef CONFIG_SBMAC_COALESCE
+	/*
+	 * Accept any TX interrupt and EOP count/timer RX interrupts on ch 0
+	 */
+	SBMAC_WRITECSR(s->sbm_imr,
+		       ((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));
+#else
+	/*
+	 * Accept any kind of interrupt on TX and RX DMA channel 0
+	 */
+	SBMAC_WRITECSR(s->sbm_imr,
+		       (M_MAC_INT_CHANNEL << S_MAC_TX_CH0) |
+		       (M_MAC_INT_CHANNEL << S_MAC_RX_CH0));
+#endif
+	
+	/* 
+	 * Enable receiving unicasts and broadcasts 
+	 */
+	
+	SBMAC_WRITECSR(s->sbm_rxfilter,M_MAC_UCAST_EN | M_MAC_BCAST_EN);
+	
+	/*
+	 * 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 */
+	
+	SBMAC_WRITECSR(s->sbm_rxfilter,0);
+	SBMAC_WRITECSR(s->sbm_imr,0);
+	
+	/* Turn off ticker */
+	
+	/* XXX */
+	
+	/* turn off receiver and transmitter */
+	
+	SBMAC_WRITECSR(s->sbm_macenable,0);
+	
+	/* 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 sbmac_state_t sbmac_set_channel_state(struct sbmac_softc *sc,
+					     sbmac_state_t state)
+{
+	sbmac_state_t 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 = SBMAC_READCSR(sc->sbm_rxfilter);
+		reg |= M_MAC_ALLPKT_EN;
+		SBMAC_WRITECSR(sc->sbm_rxfilter,reg);
+	}	
+	else {
+		reg = SBMAC_READCSR(sc->sbm_rxfilter);
+		reg &= ~M_MAC_ALLPKT_EN;
+		SBMAC_WRITECSR(sc->sbm_rxfilter,reg);
+	}
+}
+
+/**********************************************************************
+ *  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 = SBMAC_READCSR(sc->sbm_rxfilter);
+	reg &= ~M_MAC_IPHDR_OFFSET | V_MAC_IPHDR_OFFSET(15);
+	SBMAC_WRITECSR(sc->sbm_rxfilter,reg);
+	
+	/* read system identification to determine revision */
+	if (periph_rev >= 2) {
+		sc->rx_hw_checksum = ENABLE;
+	} else {
+		sc->rx_hw_checksum = DISABLE;
+	}
+}
+
+
+/**********************************************************************
+ *  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 sbmac_speed_t enum)
+ *  	   
+ *  Return value:
+ *  	   1 if successful
+ *      0 indicates invalid parameters
+ ********************************************************************* */
+
+static int sbmac_set_speed(struct sbmac_softc *s,sbmac_speed_t 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 = SBMAC_READCSR(s->sbm_maccfg);
+	framecfg = SBMAC_READCSR(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;
+		
+	case sbmac_speed_auto:		/* XXX not implemented */
+		/* fall through */
+	default:
+		return 0;
+	}
+	
+	/*
+	 * Send the bits back to the hardware 
+	 */
+	
+	SBMAC_WRITECSR(s->sbm_framecfg,framecfg);
+	SBMAC_WRITECSR(s->sbm_maccfg,cfg);
+	
+	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 sbmac_duplex_t)
+ *  	   fc - flow control setting (see sbmac_fc_t)
+ *  	   
+ *  Return value:
+ *  	   1 if ok
+ *  	   0 if an invalid parameter combination was specified
+ ********************************************************************* */
+
+static int sbmac_set_duplex(struct sbmac_softc *s,sbmac_duplex_t duplex,sbmac_fc_t 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 = SBMAC_READCSR(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_auto:		/* XXX not implemented */
+			/* fall through */					   
+		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 */
+		case sbmac_fc_auto:		/* XXX not implemented */
+			/* fall through */					   
+		default:
+			return 0;
+		}
+		break;
+	case sbmac_duplex_auto:
+		/* XXX not implemented */
+		break;
+	}
+	
+	/*
+	 * Send the bits back to the hardware 
+	 */
+	
+	SBMAC_WRITECSR(s->sbm_maccfg,cfg);
+	
+	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 pt_regs *rgs)
+{
+	struct net_device *dev = (struct net_device *) dev_instance;
+	struct sbmac_softc *sc = netdev_priv(dev);
+	uint64_t isr;
+	int handled = 0;
+
+	for (;;) {
+		
+		/*
+		 * Read the ISR (this clears the bits in the real
+		 * register, except for counter addr)
+		 */
+		
+		isr = SBMAC_READCSR(sc->sbm_isr) & ~M_MAC_COUNTER_ADDR;
+		
+		if (isr == 0)
+			break;
+
+		handled = 1;
+		
+		/*
+		 * Transmits on channel 0
+		 */
+		
+		if (isr & (M_MAC_INT_CHANNEL << S_MAC_TX_CH0)) {
+			sbdma_tx_process(sc,&(sc->sbm_txdma));
+		}
+		
+		/*
+		 * Receives on channel 0
+		 */
+
+		/*
+		 * It's important to test all the bits (or at least the
+		 * EOP_SEEN bit) when deciding to do the RX process
+		 * particularly when coalescing, to make sure we
+		 * take care of the following:
+		 *
+		 * If you have some packets waiting (have been received
+		 * but no interrupt) and get a TX interrupt before
+		 * the RX timer or counter expires, reading the ISR
+		 * above will clear the timer and counter, and you
+		 * won't get another interrupt until a packet shows
+		 * up to start the timer again.  Testing
+		 * EOP_SEEN here takes care of this case.
+		 * (EOP_SEEN is part of M_MAC_INT_CHANNEL << S_MAC_RX_CH0)
+		 */
+		 
+		
+		if (isr & (M_MAC_INT_CHANNEL << S_MAC_RX_CH0)) {
+			sbdma_rx_process(sc,&(sc->sbm_rxdma));
+		}
+	}
+	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);
+	
+	/* lock eth irq */
+	spin_lock_irq (&sc->sbm_lock);
+	
+	/*
+	 * 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_irq(&sc->sbm_lock);
+
+		return 1;
+	}
+	
+	dev->trans_start = jiffies;
+	
+	spin_unlock_irq (&sc->sbm_lock);
+	
+	return 0;
+}
+
+/**********************************************************************
+ *  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;
+	sbmac_port_t port;
+	int idx;
+	struct dev_mc_list *mclist;
+	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));
+		SBMAC_WRITECSR(port,0);	
+	}
+	
+	for (idx = 0; idx < MAC_HASH_COUNT; idx++) {
+		port = sc->sbm_base + R_MAC_HASH_BASE+(idx*sizeof(uint64_t));
+		SBMAC_WRITECSR(port,0);	
+	}
+	
+	/*
+	 * Clear the filter to say we don't want any multicasts.
+	 */
+	
+	reg = SBMAC_READCSR(sc->sbm_rxfilter);
+	reg &= ~(M_MAC_MCAST_INV | M_MAC_MCAST_EN);
+	SBMAC_WRITECSR(sc->sbm_rxfilter,reg);
+	
+	if (dev->flags & IFF_ALLMULTI) {
+		/* 
+		 * Enable ALL multicasts.  Do this by inverting the 
+		 * multicast enable bit. 
+		 */
+		reg = SBMAC_READCSR(sc->sbm_rxfilter);
+		reg |= (M_MAC_MCAST_INV | M_MAC_MCAST_EN);
+		SBMAC_WRITECSR(sc->sbm_rxfilter,reg);
+		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 */
+	mclist = dev->mc_list;
+	while (mclist && (idx < MAC_ADDR_COUNT)) {
+		reg = sbmac_addr2reg(mclist->dmi_addr);
+		port = sc->sbm_base + R_MAC_ADDR_BASE+(idx * sizeof(uint64_t));
+		SBMAC_WRITECSR(port,reg);
+		idx++;
+		mclist = mclist->next;
+	}
+	
+	/*	
+	 * Enable the "accept multicast bits" if we programmed at least one
+	 * multicast. 
+	 */
+	
+	if (idx > 1) {
+		reg = SBMAC_READCSR(sc->sbm_rxfilter);
+		reg |= M_MAC_MCAST_EN;
+		SBMAC_WRITECSR(sc->sbm_rxfilter,reg);
+	}
+}
+
+
+
+#if defined(SBMAC_ETH0_HWADDR) || defined(SBMAC_ETH1_HWADDR) || defined(SBMAC_ETH2_HWADDR)
+/**********************************************************************
+ *  SBMAC_PARSE_XDIGIT(str)
+ *  
+ *  Parse a hex digit, returning its value
+ *  
+ *  Input parameters: 
+ *  	   str - character
+ *  	   
+ *  Return value:
+ *  	   hex value, or -1 if invalid
+ ********************************************************************* */
+
+static int sbmac_parse_xdigit(char str)
+{
+	int digit;
+	
+	if ((str >= '0') && (str <= '9'))
+		digit = str - '0';
+	else if ((str >= 'a') && (str <= 'f'))
+		digit = str - 'a' + 10;
+	else if ((str >= 'A') && (str <= 'F'))
+		digit = str - 'A' + 10;
+	else
+		return -1;
+	
+	return digit;
+}
+
+/**********************************************************************
+ *  SBMAC_PARSE_HWADDR(str,hwaddr)
+ *  
+ *  Convert a string in the form xx:xx:xx:xx:xx:xx into a 6-byte
+ *  Ethernet address.
+ *  
+ *  Input parameters: 
+ *  	   str - string
+ *  	   hwaddr - pointer to hardware address
+ *  	   
+ *  Return value:
+ *  	   0 if ok, else -1
+ ********************************************************************* */
+
+static int sbmac_parse_hwaddr(char *str, unsigned char *hwaddr)
+{
+	int digit1,digit2;
+	int idx = 6;
+	
+	while (*str && (idx > 0)) {
+		digit1 = sbmac_parse_xdigit(*str);
+		if (digit1 < 0)
+			return -1;
+		str++;
+		if (!*str)
+			return -1;
+		
+		if ((*str == ':') || (*str == '-')) {
+			digit2 = digit1;
+			digit1 = 0;
+		}
+		else {
+			digit2 = sbmac_parse_xdigit(*str);
+			if (digit2 < 0)
+				return -1;
+			str++;
+		}
+		
+		*hwaddr++ = (digit1 << 4) | digit2;
+		idx--;
+		
+		if (*str == '-')
+			str++;
+		if (*str == ':')
+			str++;
+	}
+	return 0;
+}
+#endif
+
+static int sb1250_change_mtu(struct net_device *_dev, int new_mtu)
+{
+	if (new_mtu >  ENET_PACKET_SIZE)
+		return -EINVAL;
+	_dev->mtu = new_mtu;
+	printk(KERN_INFO "changing the mtu to %d\n", new_mtu);
+	return 0;
+}
+
+/**********************************************************************
+ *  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 net_device *dev, int idx)
+{
+	struct sbmac_softc *sc;
+	unsigned char *eaddr;
+	uint64_t ea_reg;
+	int i;
+	int err;
+	
+	sc = netdev_priv(dev);
+	
+	/* Determine controller base address */
+	
+	sc->sbm_base = IOADDR(dev->base_addr);
+	sc->sbm_dev = dev;
+	sc->sbe_idx = idx;
+	
+	eaddr = sc->sbm_hwaddr;
+	
+	/* 
+	 * Read the ethernet address.  The firwmare left this programmed
+	 * for us in the ethernet address register for each mac.
+	 */
+	
+	ea_reg = SBMAC_READCSR(sc->sbm_base + R_MAC_ETHERNET_ADDR);
+	SBMAC_WRITECSR(sc->sbm_base + R_MAC_ETHERNET_ADDR, 0);
+	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];
+	}
+	
+	
+	/*
+	 * Init packet size 
+	 */
+	
+	sc->sbm_buffersize = ENET_PACKET_SIZE + SMP_CACHE_BYTES * 2 + ETHER_ALIGN;
+
+	/* 
+	 * 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->open               = sbmac_open;
+	dev->hard_start_xmit    = sbmac_start_tx;
+	dev->stop               = sbmac_close;
+	dev->get_stats          = sbmac_get_stats;
+	dev->set_multicast_list = sbmac_set_rx_mode;
+	dev->do_ioctl           = sbmac_mii_ioctl;
+	dev->tx_timeout         = sbmac_tx_timeout;
+	dev->watchdog_timeo     = TX_TIMEOUT;
+
+	dev->change_mtu         = sb1250_change_mtu;
+
+	/* This is needed for PASS2 for Rx H/W checksum feature */
+	sbmac_set_iphdr_offset(sc);
+
+	err = register_netdev(dev);
+	if (err)
+		goto out_uninit;
+
+	if (periph_rev >= 2) {
+		printk(KERN_INFO "%s: enabling TCP rcv checksum\n",
+			sc->sbm_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)
+	 */
+	printk(KERN_INFO
+	       "%s: SiByte Ethernet at 0x%08lX, address: %02X:%02X:%02X:%02X:%02X:%02X\n", 
+	       dev->name, dev->base_addr,
+	       eaddr[0],eaddr[1],eaddr[2],eaddr[3],eaddr[4],eaddr[5]);
+	
+
+	return 0;
+
+out_uninit:
+	sbmac_uninitctx(sc);
+
+	return err;
+}
+
+
+static int sbmac_open(struct net_device *dev)
+{
+	struct sbmac_softc *sc = netdev_priv(dev);
+	
+	if (debug > 1) {
+		printk(KERN_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)
+	 */
+
+	SBMAC_READCSR(sc->sbm_isr);
+	if (request_irq(dev->irq, &sbmac_intr, SA_SHIRQ, dev->name, dev))
+		return -EBUSY;
+
+	/*
+	 * Configure default speed 
+	 */
+
+	sbmac_mii_poll(sc,noisy_mii);
+	
+	/*
+	 * Turn on the channel
+	 */
+
+	sbmac_set_channel_state(sc,sbmac_state_on);
+	
+	/*
+	 * XXX Station address is in dev->dev_addr
+	 */
+	
+	if (dev->if_port == 0)
+		dev->if_port = 0; 
+	
+	netif_start_queue(dev);
+	
+	sbmac_set_rx_mode(dev);
+	
+	/* Set the timer to check for link beat. */
+	init_timer(&sc->sbm_timer);
+	sc->sbm_timer.expires = jiffies + 2 * HZ/100;
+	sc->sbm_timer.data = (unsigned long)dev;
+	sc->sbm_timer.function = &sbmac_timer;
+	add_timer(&sc->sbm_timer);
+	
+	return 0;
+}
+
+
+
+static int sbmac_mii_poll(struct sbmac_softc *s,int noisy)
+{
+    int bmsr,bmcr,k1stsr,anlpar;
+    int chg;
+    char buffer[100];
+    char *p = buffer;
+
+    /* Read the mode status and mode control registers. */
+    bmsr = sbmac_mii_read(s,s->sbm_phys[0],MII_BMSR);
+    bmcr = sbmac_mii_read(s,s->sbm_phys[0],MII_BMCR);
+
+    /* get the link partner status */
+    anlpar = sbmac_mii_read(s,s->sbm_phys[0],MII_ANLPAR);
+
+    /* if supported, read the 1000baseT register */
+    if (bmsr & BMSR_1000BT_XSR) {
+	k1stsr = sbmac_mii_read(s,s->sbm_phys[0],MII_K1STSR);
+	}
+    else {
+	k1stsr = 0;
+	}
+
+    chg = 0;
+
+    if ((bmsr & BMSR_LINKSTAT) == 0) {
+	/*
+	 * If link status is down, clear out old info so that when
+	 * it comes back up it will force us to reconfigure speed
+	 */
+	s->sbm_phy_oldbmsr = 0;
+	s->sbm_phy_oldanlpar = 0;
+	s->sbm_phy_oldk1stsr = 0;
+	return 0;
+	}
+
+    if ((s->sbm_phy_oldbmsr != bmsr) ||
+	(s->sbm_phy_oldanlpar != anlpar) ||
+	(s->sbm_phy_oldk1stsr != k1stsr)) {
+	if (debug > 1) {
+	    printk(KERN_DEBUG "%s: bmsr:%x/%x anlpar:%x/%x  k1stsr:%x/%x\n",
+	       s->sbm_dev->name,
+	       s->sbm_phy_oldbmsr,bmsr,
+	       s->sbm_phy_oldanlpar,anlpar,
+	       s->sbm_phy_oldk1stsr,k1stsr);
+	    }
+	s->sbm_phy_oldbmsr = bmsr;
+	s->sbm_phy_oldanlpar = anlpar;
+	s->sbm_phy_oldk1stsr = k1stsr;
+	chg = 1;
+	}
+
+    if (chg == 0)
+	    return 0;
+
+    p += sprintf(p,"Link speed: ");
+
+    if (k1stsr & K1STSR_LP1KFD) {
+	s->sbm_speed = sbmac_speed_1000;
+	s->sbm_duplex = sbmac_duplex_full;
+	s->sbm_fc = sbmac_fc_frame;
+	p += sprintf(p,"1000BaseT FDX");
+	}
+    else if (k1stsr & K1STSR_LP1KHD) {
+	s->sbm_speed = sbmac_speed_1000;
+	s->sbm_duplex = sbmac_duplex_half;
+	s->sbm_fc = sbmac_fc_disabled;
+	p += sprintf(p,"1000BaseT HDX");
+	}
+    else if (anlpar & ANLPAR_TXFD) {
+	s->sbm_speed = sbmac_speed_100;
+	s->sbm_duplex = sbmac_duplex_full;
+	s->sbm_fc = (anlpar & ANLPAR_PAUSE) ? sbmac_fc_frame : sbmac_fc_disabled;
+	p += sprintf(p,"100BaseT FDX");
+	}
+    else if (anlpar & ANLPAR_TXHD) {
+	s->sbm_speed = sbmac_speed_100;
+	s->sbm_duplex = sbmac_duplex_half;
+	s->sbm_fc = sbmac_fc_disabled;
+	p += sprintf(p,"100BaseT HDX");
+	}
+    else if (anlpar & ANLPAR_10FD) {
+	s->sbm_speed = sbmac_speed_10;
+	s->sbm_duplex = sbmac_duplex_full;
+	s->sbm_fc = sbmac_fc_frame;
+	p += sprintf(p,"10BaseT FDX");
+	}
+    else if (anlpar & ANLPAR_10HD) {
+	s->sbm_speed = sbmac_speed_10;
+	s->sbm_duplex = sbmac_duplex_half;
+	s->sbm_fc = sbmac_fc_collision;
+	p += sprintf(p,"10BaseT HDX");
+	}
+    else {
+	p += sprintf(p,"Unknown");
+	}
+
+    if (noisy) {
+	    printk(KERN_INFO "%s: %s\n",s->sbm_dev->name,buffer);
+	    }
+
+    return 1;
+}
+
+
+static void sbmac_timer(unsigned long data)
+{
+	struct net_device *dev = (struct net_device *)data;
+	struct sbmac_softc *sc = netdev_priv(dev);
+	int next_tick = HZ;
+	int mii_status;
+
+	spin_lock_irq (&sc->sbm_lock);
+	
+	/* make IFF_RUNNING follow the MII status bit "Link established" */
+	mii_status = sbmac_mii_read(sc, sc->sbm_phys[0], MII_BMSR);
+	
+	if ( (mii_status & BMSR_LINKSTAT) != (sc->sbm_phy_oldlinkstat) ) {
+    	        sc->sbm_phy_oldlinkstat = mii_status & BMSR_LINKSTAT;
+		if (mii_status & BMSR_LINKSTAT) {
+			netif_carrier_on(dev);
+		}
+		else {
+			netif_carrier_off(dev);	
+		}
+	}
+	
+	/*
+	 * Poll the PHY to see what speed we should be running at
+	 */
+
+	if (sbmac_mii_poll(sc,noisy_mii)) {
+		if (sc->sbm_state != sbmac_state_off) {
+			/*
+			 * something changed, restart the channel
+			 */
+			if (debug > 1) {
+				printk("%s: restarting channel because speed changed\n",
+				       sc->sbm_dev->name);
+			}
+			sbmac_channel_stop(sc);
+			sbmac_channel_start(sc);
+		}
+	}
+	
+	spin_unlock_irq (&sc->sbm_lock);
+	
+	sc->sbm_timer.expires = jiffies + next_tick;
+	add_timer(&sc->sbm_timer);
+}
+
+
+static void sbmac_tx_timeout (struct net_device *dev)
+{
+	struct sbmac_softc *sc = netdev_priv(dev);
+	
+	spin_lock_irq (&sc->sbm_lock);
+	
+	
+	dev->trans_start = jiffies;
+	sc->sbm_stats.tx_errors++;
+	
+	spin_unlock_irq (&sc->sbm_lock);
+
+	printk (KERN_WARNING "%s: Transmit timed out\n",dev->name);
+}
+
+
+
+
+static struct net_device_stats *sbmac_get_stats(struct net_device *dev)
+{
+	struct sbmac_softc *sc = netdev_priv(dev);
+	unsigned long flags;
+	
+	spin_lock_irqsave(&sc->sbm_lock, flags);
+	
+	/* XXX update other stats here */
+	
+	spin_unlock_irqrestore(&sc->sbm_lock, flags);
+	
+	return &sc->sbm_stats;
+}
+
+
+
+static void sbmac_set_rx_mode(struct net_device *dev)
+{
+	unsigned long flags;
+	int msg_flag = 0;
+	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) {	
+			/* Unconditionally log net taps. */
+			msg_flag = 1;
+			sbmac_promiscuous_mode(sc,1);
+		}
+		else {
+			msg_flag = 2;
+			sbmac_promiscuous_mode(sc,0);
+		}
+	}
+	spin_unlock_irqrestore(&sc->sbm_lock, flags);
+	
+	if (msg_flag) {
+		printk(KERN_NOTICE "%s: Promiscuous mode %sabled.\n",
+		       dev->name,(msg_flag==1)?"en":"dis");
+	}
+	
+	/*
+	 * 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);
+	u16 *data = (u16 *)&rq->ifr_ifru;
+	unsigned long flags;
+	int retval;
+	
+	spin_lock_irqsave(&sc->sbm_lock, flags);
+	retval = 0;
+	
+	switch(cmd) {
+	case SIOCDEVPRIVATE:		/* Get the address of the PHY in use. */
+		data[0] = sc->sbm_phys[0] & 0x1f;
+		/* Fall Through */
+	case SIOCDEVPRIVATE+1:		/* Read the specified MII register. */
+		data[3] = sbmac_mii_read(sc, data[0] & 0x1f, data[1] & 0x1f);
+		break;
+	case SIOCDEVPRIVATE+2:		/* Write the specified MII register */
+		if (!capable(CAP_NET_ADMIN)) {
+			retval = -EPERM;
+			break;
+		}
+		if (debug > 1) {
+		    printk(KERN_DEBUG "%s: sbmac_mii_ioctl: write %02X %02X %02X\n",dev->name,
+		       data[0],data[1],data[2]);
+		    }
+		sbmac_mii_write(sc, data[0] & 0x1f, data[1] & 0x1f, data[2]);
+		break;
+	default:
+		retval = -EOPNOTSUPP;
+	}
+	
+	spin_unlock_irqrestore(&sc->sbm_lock, flags);
+	return retval;
+}
+
+static int sbmac_close(struct net_device *dev)
+{
+	struct sbmac_softc *sc = netdev_priv(dev);
+	unsigned long flags;
+	int irq;
+
+	sbmac_set_channel_state(sc,sbmac_state_off);
+
+	del_timer_sync(&sc->sbm_timer);
+
+	spin_lock_irqsave(&sc->sbm_lock, flags);
+
+	netif_stop_queue(dev);
+
+	if (debug > 1) {
+		printk(KERN_DEBUG "%s: Shutting down ethercard\n",dev->name);
+	}
+
+	spin_unlock_irqrestore(&sc->sbm_lock, flags);
+
+	irq = dev->irq;
+	synchronize_irq(irq);
+	free_irq(irq, dev);
+
+	sbdma_emptyring(&(sc->sbm_txdma));
+	sbdma_emptyring(&(sc->sbm_rxdma));
+	
+	return 0;
+}
+
+
+
+#if defined(SBMAC_ETH0_HWADDR) || defined(SBMAC_ETH1_HWADDR) || defined(SBMAC_ETH2_HWADDR)
+static void
+sbmac_setup_hwaddr(int chan,char *addr)
+{
+	uint8_t eaddr[6];
+	uint64_t val;
+	sbmac_port_t port;
+
+	port = A_MAC_CHANNEL_BASE(chan);
+	sbmac_parse_hwaddr(addr,eaddr);
+	val = sbmac_addr2reg(eaddr);
+	SBMAC_WRITECSR(IOADDR(port+R_MAC_ETHERNET_ADDR),val);
+	val = SBMAC_READCSR(IOADDR(port+R_MAC_ETHERNET_ADDR));
+}
+#endif
+
+static struct net_device *dev_sbmac[MAX_UNITS];
+
+static int __init
+sbmac_init_module(void)
+{
+	int idx;
+	struct net_device *dev;
+	sbmac_port_t port;
+	int chip_max_units;
+	
+	/*
+	 * For bringup when not using the firmware, we can pre-fill
+	 * the MAC addresses using the environment variables
+	 * specified in this file (or maybe from the config file?)
+	 */
+#ifdef SBMAC_ETH0_HWADDR
+	sbmac_setup_hwaddr(0,SBMAC_ETH0_HWADDR);
+#endif
+#ifdef SBMAC_ETH1_HWADDR
+	sbmac_setup_hwaddr(1,SBMAC_ETH1_HWADDR);
+#endif
+#ifdef SBMAC_ETH2_HWADDR
+	sbmac_setup_hwaddr(2,SBMAC_ETH2_HWADDR);
+#endif
+
+	/*
+	 * Walk through the Ethernet controllers and find
+	 * those who have their MAC addresses set.
+	 */
+	switch (soc_type) {
+	case K_SYS_SOC_TYPE_BCM1250:
+	case K_SYS_SOC_TYPE_BCM1250_ALT:
+		chip_max_units = 3;
+		break;
+	case K_SYS_SOC_TYPE_BCM1120:
+	case K_SYS_SOC_TYPE_BCM1125:
+	case K_SYS_SOC_TYPE_BCM1125H:
+	case K_SYS_SOC_TYPE_BCM1250_ALT2: /* Hybrid */
+		chip_max_units = 2;
+		break;
+	default:
+		chip_max_units = 0;
+		break;
+	}
+	if (chip_max_units > MAX_UNITS)
+		chip_max_units = MAX_UNITS;
+
+	for (idx = 0; idx < chip_max_units; idx++) {
+
+	        /*
+	         * This is the base address of the MAC.
+		 */
+
+	        port = A_MAC_CHANNEL_BASE(idx);
+
+		/*	
+		 * 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[idx] = SBMAC_READCSR(IOADDR(port+R_MAC_ETHERNET_ADDR));
+		if (sbmac_orig_hwaddr[idx] == 0) {
+			printk(KERN_DEBUG "sbmac: not configuring MAC at "
+			       "%lx\n", port);
+		    continue;
+		}
+
+		/*
+		 * Okay, cool.  Initialize this MAC.
+		 */
+
+		dev = alloc_etherdev(sizeof(struct sbmac_softc));
+		if (!dev) 
+			return -ENOMEM;	/* return ENOMEM */
+
+		printk(KERN_DEBUG "sbmac: configuring MAC at %lx\n", port);
+
+		dev->irq = K_INT_MAC_0 + idx;
+		dev->base_addr = port;
+		dev->mem_end = 0;
+		if (sbmac_init(dev, idx)) {
+			port = A_MAC_CHANNEL_BASE(idx);
+			SBMAC_WRITECSR(IOADDR(port+R_MAC_ETHERNET_ADDR),
+				       sbmac_orig_hwaddr[idx]);
+			free_netdev(dev);
+			continue;
+		}
+		dev_sbmac[idx] = dev;
+	}
+	return 0;
+}
+
+
+static void __exit
+sbmac_cleanup_module(void)
+{
+	struct net_device *dev;
+	int idx;
+
+	for (idx = 0; idx < MAX_UNITS; idx++) {
+		struct sbmac_softc *sc;
+		dev = dev_sbmac[idx];
+		if (!dev)
+			continue;
+
+		sc = netdev_priv(dev);
+		unregister_netdev(dev);
+		sbmac_uninitctx(sc);
+		free_netdev(dev);
+	}
+}
+
+module_init(sbmac_init_module);
+module_exit(sbmac_cleanup_module);