harvey/sys/src/9/pc/ether2114x.c

/*
 * Digital Semiconductor DECchip 2114x PCI Fast Ethernet LAN Controller.
 * To do:
 *	thresholds;
 *	ring sizing;
 *	handle more error conditions;
 *	tidy setup packet mess;
 *	push initialisation back to attach;
 *	full SROM decoding.
 */
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "../port/error.h"
#include "../port/netif.h"

#include "etherif.h"

#define DEBUG		(0)
#define debug		if(DEBUG)print

enum {
	Nrde		= 64,
	Ntde		= 64,
};

#define Rbsz		ROUNDUP(sizeof(Etherpkt)+4, 4)

enum {					/* CRS0 - Bus Mode */
	Swr		= 0x00000001,	/* Software Reset */
	Bar		= 0x00000002,	/* Bus Arbitration */
	Dsl		= 0x0000007C,	/* Descriptor Skip Length (field) */
	Ble		= 0x00000080,	/* Big/Little Endian */
	Pbl		= 0x00003F00,	/* Programmable Burst Length (field) */
	Cal		= 0x0000C000,	/* Cache Alignment (field) */
	Cal8		= 0x00004000,	/* 8 longword boundary alignment */
	Cal16		= 0x00008000,	/* 16 longword boundary alignment */
	Cal32		= 0x0000C000,	/* 32 longword boundary alignment */
	Tap		= 0x000E0000,	/* Transmit Automatic Polling (field) */
	Dbo		= 0x00100000,	/* Descriptor Byte Ordering Mode */
	Rml		= 0x00200000,	/* Read Multiple */
}; 

enum {					/* CSR[57] - Status and Interrupt Enable */
	Ti		= 0x00000001,	/* Transmit Interrupt */
	Tps		= 0x00000002,	/* Transmit Process Stopped */
	Tu		= 0x00000004,	/* Transmit buffer Unavailable */
	Tjt		= 0x00000008,	/* Transmit Jabber Timeout */
	Unf		= 0x00000020,	/* transmit UNderFlow */
	Ri		= 0x00000040,	/* Receive Interrupt */
	Ru		= 0x00000080,	/* Receive buffer Unavailable */
	Rps		= 0x00000100,	/* Receive Process Stopped */
	Rwt		= 0x00000200,	/* Receive Watchdog Timeout */
	Eti		= 0x00000400,	/* Early Transmit Interrupt */
	Gte		= 0x00000800,	/* General purpose Timer Expired */
	Fbe		= 0x00002000,	/* Fatal Bit Error */
	Ais		= 0x00008000,	/* Abnormal Interrupt Summary */
	Nis		= 0x00010000,	/* Normal Interrupt Summary */
	Rs		= 0x000E0000,	/* Receive process State (field) */
	Ts		= 0x00700000,	/* Transmit process State (field) */
	Eb		= 0x03800000,	/* Error bits */
};

enum {					/* CSR6 - Operating Mode */
	Hp		= 0x00000001,	/* Hash/Perfect receive filtering mode */
	Sr		= 0x00000002,	/* Start/stop Receive */
	Ho		= 0x00000004,	/* Hash-Only filtering mode */
	Pb		= 0x00000008,	/* Pass Bad frames */
	If		= 0x00000010,	/* Inverse Filtering */
	Sb		= 0x00000020,	/* Start/stop Backoff counter */
	Pr		= 0x00000040,	/* Promiscuous Mode */
	Pm		= 0x00000080,	/* Pass all Multicast */
	Fd		= 0x00000200,	/* Full Duplex mode */
	Om		= 0x00000C00,	/* Operating Mode (field) */
	Fc		= 0x00001000,	/* Force Collision */
	St		= 0x00002000,	/* Start/stop Transmission Command */
	Tr		= 0x0000C000,	/* ThReshold control bits (field) */
	Tr128		= 0x00000000,
	Tr256		= 0x00004000,
	Tr512		= 0x00008000,
	Tr1024		= 0x0000C000,
	Ca		= 0x00020000,	/* CApture effect enable */
	Ps		= 0x00040000,	/* Port Select */
	Hbd		= 0x00080000,	/* HeartBeat Disable */
	Imm		= 0x00100000,	/* IMMediate mode */
	Sf		= 0x00200000,	/* Store and Forward */
	Ttm		= 0x00400000,	/* Transmit Threshold Mode */
	Pcs		= 0x00800000,	/* PCS function */
	Scr		= 0x01000000,	/* SCRambler mode */
	Mbo		= 0x02000000,	/* Must Be One */
	Ra		= 0x40000000,	/* Receive All */
	Sc		= 0x80000000,	/* Special Capture effect enable */

	TrMODE		= Tr512,	/* default transmission threshold */
};

enum {					/* CSR9 - ROM and MII Management */
	Scs		= 0x00000001,	/* serial ROM chip select */
	Sclk		= 0x00000002,	/* serial ROM clock */
	Sdi		= 0x00000004,	/* serial ROM data in */
	Sdo		= 0x00000008,	/* serial ROM data out */
	Ss		= 0x00000800,	/* serial ROM select */
	Wr		= 0x00002000,	/* write */
	Rd		= 0x00004000,	/* read */

	Mdc		= 0x00010000,	/* MII management clock */
	Mdo		= 0x00020000,	/* MII management write data */
	Mii		= 0x00040000,	/* MII management operation mode (W) */
	Mdi		= 0x00080000,	/* MII management data in */
};

enum {					/* CSR12 - General-Purpose Port */
	Gpc		= 0x00000100,	/* General Purpose Control */
};

typedef struct Des {
	int	status;
	int	control;
	ulong	addr;
	Block*	bp;
} Des;

enum {					/* status */
	Of		= 0x00000001,	/* Rx: OverFlow */
	Ce		= 0x00000002,	/* Rx: CRC Error */
	Db		= 0x00000004,	/* Rx: Dribbling Bit */
	Re		= 0x00000008,	/* Rx: Report on MII Error */
	Rw		= 0x00000010,	/* Rx: Receive Watchdog */
	Ft		= 0x00000020,	/* Rx: Frame Type */
	Cs		= 0x00000040,	/* Rx: Collision Seen */
	Tl		= 0x00000080,	/* Rx: Frame too Long */
	Ls		= 0x00000100,	/* Rx: Last deScriptor */
	Fs		= 0x00000200,	/* Rx: First deScriptor */
	Mf		= 0x00000400,	/* Rx: Multicast Frame */
	Rf		= 0x00000800,	/* Rx: Runt Frame */
	Dt		= 0x00003000,	/* Rx: Data Type (field) */
	De		= 0x00004000,	/* Rx: Descriptor Error */
	Fl		= 0x3FFF0000,	/* Rx: Frame Length (field) */
	Ff		= 0x40000000,	/* Rx: Filtering Fail */

	Def		= 0x00000001,	/* Tx: DEFerred */
	Uf		= 0x00000002,	/* Tx: UnderFlow error */
	Lf		= 0x00000004,	/* Tx: Link Fail report */
	Cc		= 0x00000078,	/* Tx: Collision Count (field) */
	Hf		= 0x00000080,	/* Tx: Heartbeat Fail */
	Ec		= 0x00000100,	/* Tx: Excessive Collisions */
	Lc		= 0x00000200,	/* Tx: Late Collision */
	Nc		= 0x00000400,	/* Tx: No Carrier */
	Lo		= 0x00000800,	/* Tx: LOss of carrier */
	To		= 0x00004000,	/* Tx: Transmission jabber timeOut */

	Es		= 0x00008000,	/* [RT]x: Error Summary */
	Own		= 0x80000000,	/* [RT]x: OWN bit */
};

enum {					/* control */
	Bs1		= 0x000007FF,	/* [RT]x: Buffer 1 Size */
	Bs2		= 0x003FF800,	/* [RT]x: Buffer 2 Size */

	Ch		= 0x01000000,	/* [RT]x: second address CHained */
	Er		= 0x02000000,	/* [RT]x: End of Ring */

	Ft0		= 0x00400000,	/* Tx: Filtering Type 0 */
	Dpd		= 0x00800000,	/* Tx: Disabled PaDding */
	Ac		= 0x04000000,	/* Tx: Add CRC disable */
	Set		= 0x08000000,	/* Tx: SETup packet */
	Ft1		= 0x10000000,	/* Tx: Filtering Type 1 */
	Fseg		= 0x20000000,	/* Tx: First SEGment */
	Lseg		= 0x40000000,	/* Tx: Last SEGment */
	Ic		= 0x80000000,	/* Tx: Interrupt on Completion */
};

enum {					/* PHY registers */
	Bmcr		= 0,		/* Basic Mode Control */
	Bmsr		= 1,		/* Basic Mode Status */
	Phyidr1		= 2,		/* PHY Identifier #1 */
	Phyidr2		= 3,		/* PHY Identifier #2 */
	Anar		= 4,		/* Auto-Negotiation Advertisment */
	Anlpar		= 5,		/* Auto-Negotiation Link Partner Ability */
	Aner		= 6,		/* Auto-Negotiation Expansion */
};

enum {					/* Variants */
	Tulip0		= (0x0009<<16)|0x1011,
	Tulip1		= (0x0014<<16)|0x1011,
	Tulip3		= (0x0019<<16)|0x1011,
	Pnic		= (0x0002<<16)|0x11AD,
	Pnic2		= (0xC115<<16)|0x11AD,
	CentaurP	= (0x0985<<16)|0x1317,
	CentaurPcb	= (0x1985<<16)|0x1317,
};

typedef struct Ctlr Ctlr;
typedef struct Ctlr {
	int	port;
	Pcidev*	pcidev;
	Ctlr*	next;
	int	active;
	int	id;			/* (pcidev->did<<16)|pcidev->vid */

	uchar*	srom;
	int	sromsz;			/* address size in bits */
	uchar*	sromea;			/* MAC address */
	uchar*	leaf;
	int	sct;			/* selected connection type */
	int	k;			/* info block count */
	uchar*	infoblock[16];
	int	sctk;			/* sct block index */
	int	curk;			/* current block index */
	uchar*	type5block;

	int	phy[32];		/* logical to physical map */
	int	phyreset;		/* reset bitmap */
	int	curphyad;
	int	fdx;
	int	ttm;

	uchar	fd;			/* option */
	int	medium;			/* option */

	int	csr6;			/* CSR6 - operating mode */
	int	mask;			/* CSR[57] - interrupt mask */
	int	mbps;

	Lock	lock;

	Des*	rdr;			/* receive descriptor ring */
	int	nrdr;			/* size of rdr */
	int	rdrx;			/* index into rdr */

	Lock	tlock;
	Des*	tdr;			/* transmit descriptor ring */
	int	ntdr;			/* size of tdr */
	int	tdrh;			/* host index into tdr */
	int	tdri;			/* interface index into tdr */
	int	ntq;			/* descriptors active */
	int	ntqmax;
	Block*	setupbp;

	ulong	of;			/* receive statistics */
	ulong	ce;
	ulong	cs;
	ulong	tl;
	ulong	rf;
	ulong	de;

	ulong	ru;
	ulong	rps;
	ulong	rwt;

	ulong	uf;			/* transmit statistics */
	ulong	ec;
	ulong	lc;
	ulong	nc;
	ulong	lo;
	ulong	to;

	ulong	tps;
	ulong	tu;
	ulong	tjt;
	ulong	unf;
} Ctlr;

static Ctlr* ctlrhead;
static Ctlr* ctlrtail;

#define csr32r(c, r)	(inl((c)->port+((r)*8)))
#define csr32w(c, r, l)	(outl((c)->port+((r)*8), (ulong)(l)))

static void
promiscuous(void* arg, int on)
{
	Ctlr *ctlr;

	ctlr = ((Ether*)arg)->ctlr;
	ilock(&ctlr->lock);
	if(on)
		ctlr->csr6 |= Pr;
	else
		ctlr->csr6 &= ~Pr;
	csr32w(ctlr, 6, ctlr->csr6);
	iunlock(&ctlr->lock);
}

/* multicast already on, don't need to do anything */
static void
multicast(void*, uchar*, int)
{
}

static void
attach(Ether* ether)
{
	Ctlr *ctlr;

	ctlr = ether->ctlr;
	ilock(&ctlr->lock);
	if(!(ctlr->csr6 & Sr)){
		ctlr->csr6 |= Sr;
		csr32w(ctlr, 6, ctlr->csr6);
	}
	iunlock(&ctlr->lock);
}

static long
ifstat(Ether* ether, void* a, long n, ulong offset)
{
	Ctlr *ctlr;
	char *buf, *p;
	int i, l, len;

	ctlr = ether->ctlr;

	ether->crcs = ctlr->ce;
	ether->frames = ctlr->rf+ctlr->cs;
	ether->buffs = ctlr->de+ctlr->tl;
	ether->overflows = ctlr->of;

	if(n == 0)
		return 0;

	p = malloc(READSTR);
	if(p == nil)
		error(Enomem);
	l = snprint(p, READSTR, "Overflow: %lud\n", ctlr->of);
	l += snprint(p+l, READSTR-l, "Ru: %lud\n", ctlr->ru);
	l += snprint(p+l, READSTR-l, "Rps: %lud\n", ctlr->rps);
	l += snprint(p+l, READSTR-l, "Rwt: %lud\n", ctlr->rwt);
	l += snprint(p+l, READSTR-l, "Tps: %lud\n", ctlr->tps);
	l += snprint(p+l, READSTR-l, "Tu: %lud\n", ctlr->tu);
	l += snprint(p+l, READSTR-l, "Tjt: %lud\n", ctlr->tjt);
	l += snprint(p+l, READSTR-l, "Unf: %lud\n", ctlr->unf);
	l += snprint(p+l, READSTR-l, "CRC Error: %lud\n", ctlr->ce);
	l += snprint(p+l, READSTR-l, "Collision Seen: %lud\n", ctlr->cs);
	l += snprint(p+l, READSTR-l, "Frame Too Long: %lud\n", ctlr->tl);
	l += snprint(p+l, READSTR-l, "Runt Frame: %lud\n", ctlr->rf);
	l += snprint(p+l, READSTR-l, "Descriptor Error: %lud\n", ctlr->de);
	l += snprint(p+l, READSTR-l, "Underflow Error: %lud\n", ctlr->uf);
	l += snprint(p+l, READSTR-l, "Excessive Collisions: %lud\n", ctlr->ec);
	l += snprint(p+l, READSTR-l, "Late Collision: %lud\n", ctlr->lc);
	l += snprint(p+l, READSTR-l, "No Carrier: %lud\n", ctlr->nc);
	l += snprint(p+l, READSTR-l, "Loss of Carrier: %lud\n", ctlr->lo);
	l += snprint(p+l, READSTR-l, "Transmit Jabber Timeout: %lud\n",
		ctlr->to);
	l += snprint(p+l, READSTR-l, "csr6: %luX %uX\n", csr32r(ctlr, 6),
		ctlr->csr6);
	snprint(p+l, READSTR-l, "ntqmax: %d\n", ctlr->ntqmax);
	ctlr->ntqmax = 0;
	buf = a;
	len = readstr(offset, buf, n, p);
	if(offset > l)
		offset -= l;
	else
		offset = 0;
	buf += len;
	n -= len;

	l = snprint(p, READSTR, "srom:");
	for(i = 0; i < (1<<(ctlr->sromsz)*sizeof(ushort)); i++){
		if(i && ((i & 0x0F) == 0))
			l += snprint(p+l, READSTR-l, "\n     ");
		l += snprint(p+l, READSTR-l, " %2.2uX", ctlr->srom[i]);
	}

	snprint(p+l, READSTR-l, "\n");
	len += readstr(offset, buf, n, p);
	free(p);

	return len;
}

static void
txstart(Ether* ether)
{
	Ctlr *ctlr;
	Block *bp;
	Des *des;
	int control;

	ctlr = ether->ctlr;
	while(ctlr->ntq < (ctlr->ntdr-1)){
		if(ctlr->setupbp){
			bp = ctlr->setupbp;
			ctlr->setupbp = 0;
			control = Ic|Set|BLEN(bp);
		}
		else{
			bp = qget(ether->oq);
			if(bp == nil)
				break;
			control = Ic|Lseg|Fseg|BLEN(bp);
		}

		ctlr->tdr[PREV(ctlr->tdrh, ctlr->ntdr)].control &= ~Ic;
		des = &ctlr->tdr[ctlr->tdrh];
		des->bp = bp;
		des->addr = PCIWADDR(bp->rp);
		des->control |= control;
		ctlr->ntq++;
		coherence();
		des->status = Own;
		csr32w(ctlr, 1, 0);
		ctlr->tdrh = NEXT(ctlr->tdrh, ctlr->ntdr);
	}

	if(ctlr->ntq > ctlr->ntqmax)
		ctlr->ntqmax = ctlr->ntq;
}

static void
transmit(Ether* ether)
{
	Ctlr *ctlr;

	ctlr = ether->ctlr;
	ilock(&ctlr->tlock);
	txstart(ether);
	iunlock(&ctlr->tlock);
}

static void
interrupt(Ureg*, void* arg)
{
	Ctlr *ctlr;
	Ether *ether;
	int len, status;
	Des *des;
	Block *bp;

	ether = arg;
	ctlr = ether->ctlr;

	while((status = csr32r(ctlr, 5)) & (Nis|Ais)){
		/*
		 * Acknowledge the interrupts and mask-out
		 * the ones that are implicitly handled.
		 */
		csr32w(ctlr, 5, status);
		status &= (ctlr->mask & ~(Nis|Ti));

		if(status & Ais){
			if(status & Tps)
				ctlr->tps++;
			if(status & Tu)
				ctlr->tu++;
			if(status & Tjt)
				ctlr->tjt++;
			if(status & Ru)
				ctlr->ru++;
			if(status & Rps)
				ctlr->rps++;
			if(status & Rwt)
				ctlr->rwt++;
			status &= ~(Ais|Rwt|Rps|Ru|Tjt|Tu|Tps);
		}

		/*
		 * Received packets.
		 */
		if(status & Ri){
			des = &ctlr->rdr[ctlr->rdrx];
			while(!(des->status & Own)){
				if(des->status & Es){
					if(des->status & Of)
						ctlr->of++;
					if(des->status & Ce)
						ctlr->ce++;
					if(des->status & Cs)
						ctlr->cs++;
					if(des->status & Tl)
						ctlr->tl++;
					if(des->status & Rf)
						ctlr->rf++;
					if(des->status & De)
						ctlr->de++;
				}
				else if(bp = iallocb(Rbsz)){
					len = ((des->status & Fl)>>16)-4;
					des->bp->wp = des->bp->rp+len;
					etheriq(ether, des->bp, 1);
					des->bp = bp;
					des->addr = PCIWADDR(bp->rp);
				}

				des->control &= Er;
				des->control |= Rbsz;
				coherence();
				des->status = Own;

				ctlr->rdrx = NEXT(ctlr->rdrx, ctlr->nrdr);
				des = &ctlr->rdr[ctlr->rdrx];
			}
			status &= ~Ri;
		}

		/*
		 * Check the transmit side:
		 *	check for Transmit Underflow and Adjust
		 *	the threshold upwards;
		 *	free any transmitted buffers and try to
		 *	top-up the ring.
		 */
		if(status & Unf){
			ctlr->unf++;
			ilock(&ctlr->lock);
			csr32w(ctlr, 6, ctlr->csr6 & ~St);
			switch(ctlr->csr6 & Tr){
			case Tr128:
				len = Tr256;
				break;
			case Tr256:
				len = Tr512;
				break;
			case Tr512:
				len = Tr1024;
				break;
			default:
			case Tr1024:
				len = Sf;
				break;
			}
			ctlr->csr6 = (ctlr->csr6 & ~Tr)|len;
			csr32w(ctlr, 6, ctlr->csr6);
			iunlock(&ctlr->lock);
			csr32w(ctlr, 5, Tps);
			status &= ~(Unf|Tps);
		}

		ilock(&ctlr->tlock);
		while(ctlr->ntq){
			des = &ctlr->tdr[ctlr->tdri];
			if(des->status & Own)
				break;

			if(des->status & Es){
				if(des->status & Uf)
					ctlr->uf++;
				if(des->status & Ec)
					ctlr->ec++;
				if(des->status & Lc)
					ctlr->lc++;
				if(des->status & Nc)
					ctlr->nc++;
				if(des->status & Lo)
					ctlr->lo++;
				if(des->status & To)
					ctlr->to++;
				ether->oerrs++;
			}

			freeb(des->bp);
			des->control &= Er;

			ctlr->ntq--;
			ctlr->tdri = NEXT(ctlr->tdri, ctlr->ntdr);
		}
		txstart(ether);
		iunlock(&ctlr->tlock);

		/*
		 * Anything left not catered for?
		 */
		if(status)
			panic("#l%d: status %8.8uX\n", ether->ctlrno, status);
	}
}

static void
ctlrinit(Ether* ether)
{
	Ctlr *ctlr;
	Des *des;
	Block *bp;
	int i;
	uchar bi[Eaddrlen*2];

	ctlr = ether->ctlr;

	/*
	 * Allocate and initialise the receive ring;
	 * allocate and initialise the transmit ring;
	 * unmask interrupts and start the transmit side;
	 * create and post a setup packet to initialise
	 * the physical ethernet address.
	 */
	ctlr->rdr = xspanalloc(ctlr->nrdr*sizeof(Des), 8*sizeof(ulong), 0);
	for(des = ctlr->rdr; des < &ctlr->rdr[ctlr->nrdr]; des++){
		des->bp = iallocb(Rbsz);
		if(des->bp == nil)
			panic("can't allocate ethernet receive ring\n");
		des->status = Own;
		des->control = Rbsz;
		des->addr = PCIWADDR(des->bp->rp);
	}
	ctlr->rdr[ctlr->nrdr-1].control |= Er;
	ctlr->rdrx = 0;
	csr32w(ctlr, 3, PCIWADDR(ctlr->rdr));

	ctlr->tdr = xspanalloc(ctlr->ntdr*sizeof(Des), 8*sizeof(ulong), 0);
	ctlr->tdr[ctlr->ntdr-1].control |= Er;
	ctlr->tdrh = 0;
	ctlr->tdri = 0;
	csr32w(ctlr, 4, PCIWADDR(ctlr->tdr));

	/*
	 * Clear any bits in the Status Register (CSR5) as
	 * the PNIC has a different reset value from a true 2114x.
	 */
	ctlr->mask = Nis|Ais|Fbe|Rwt|Rps|Ru|Ri|Unf|Tjt|Tps|Ti;
	csr32w(ctlr, 5, ctlr->mask);
	csr32w(ctlr, 7, ctlr->mask);
	ctlr->csr6 |= St|Pm;
	csr32w(ctlr, 6, ctlr->csr6);

	for(i = 0; i < Eaddrlen/2; i++){
		bi[i*4] = ether->ea[i*2];
		bi[i*4+1] = ether->ea[i*2+1];
		bi[i*4+2] = ether->ea[i*2+1];
		bi[i*4+3] = ether->ea[i*2];
	}
	bp = iallocb(Eaddrlen*2*16);
	if(bp == nil)
		panic("can't allocate ethernet setup buffer\n");
	memset(bp->rp, 0xFF, sizeof(bi));
	for(i = sizeof(bi); i < sizeof(bi)*16; i += sizeof(bi))
		memmove(bp->rp+i, bi, sizeof(bi));
	bp->wp += sizeof(bi)*16;

	ctlr->setupbp = bp;
	ether->oq = qopen(256*1024, Qmsg, 0, 0);
	transmit(ether);
}

static void
csr9w(Ctlr* ctlr, int data)
{
	csr32w(ctlr, 9, data);
	microdelay(1);
}

static int
miimdi(Ctlr* ctlr, int n)
{
	int data, i;

	/*
	 * Read n bits from the MII Management Register.
	 */
	data = 0;
	for(i = n-1; i >= 0; i--){
		if(csr32r(ctlr, 9) & Mdi)
			data |= (1<<i);
		csr9w(ctlr, Mii|Mdc);
		csr9w(ctlr, Mii);
	}
	csr9w(ctlr, 0);

	return data;
}

static void
miimdo(Ctlr* ctlr, int bits, int n)
{
	int i, mdo;

	/*
	 * Write n bits to the MII Management Register.
	 */
	for(i = n-1; i >= 0; i--){
		if(bits & (1<<i))
			mdo = Mdo;
		else
			mdo = 0;
		csr9w(ctlr, mdo);
		csr9w(ctlr, mdo|Mdc);
		csr9w(ctlr, mdo);
	}
}

static int
miir(Ctlr* ctlr, int phyad, int regad)
{
	int data, i;

	if(ctlr->id == Pnic){
		i = 1000;
		csr32w(ctlr, 20, 0x60020000|(phyad<<23)|(regad<<18));
		do{
			microdelay(1);
			data = csr32r(ctlr, 20);
		}while((data & 0x80000000) && --i);

		if(i == 0)
			return -1;
		return data & 0xFFFF;
	}

	/*
	 * Preamble;
	 * ST+OP+PHYAD+REGAD;
	 * TA + 16 data bits.
	 */
	miimdo(ctlr, 0xFFFFFFFF, 32);
	miimdo(ctlr, 0x1800|(phyad<<5)|regad, 14);
	data = miimdi(ctlr, 18);

	if(data & 0x10000)
		return -1;

	return data & 0xFFFF;
}

static void
miiw(Ctlr* ctlr, int phyad, int regad, int data)
{
	/*
	 * Preamble;
	 * ST+OP+PHYAD+REGAD+TA + 16 data bits;
	 * Z.
	 */
	miimdo(ctlr, 0xFFFFFFFF, 32);
	data &= 0xFFFF;
	data |= (0x05<<(5+5+2+16))|(phyad<<(5+2+16))|(regad<<(2+16))|(0x02<<16);
	miimdo(ctlr, data, 32);
	csr9w(ctlr, Mdc);
	csr9w(ctlr, 0);
}

static int
sromr(Ctlr* ctlr, int r)
{
	int i, op, data, size;

	if(ctlr->id == Pnic){
		i = 1000;
		csr32w(ctlr, 19, 0x600|r);
		do{
			microdelay(1);
			data = csr32r(ctlr, 19);
		}while((data & 0x80000000) && --i);

		if(ctlr->sromsz == 0)
			ctlr->sromsz = 6;

		return csr32r(ctlr, 9) & 0xFFFF;
	}

	/*
	 * This sequence for reading a 16-bit register 'r'
	 * in the EEPROM is taken (pretty much) straight from Section
	 * 7.4 of the 21140 Hardware Reference Manual.
	 */
reread:
	csr9w(ctlr, Rd|Ss);
	csr9w(ctlr, Rd|Ss|Scs);
	csr9w(ctlr, Rd|Ss|Sclk|Scs);
	csr9w(ctlr, Rd|Ss);

	op = 0x06;
	for(i = 3-1; i >= 0; i--){
		data = Rd|Ss|(((op>>i) & 0x01)<<2)|Scs;
		csr9w(ctlr, data);
		csr9w(ctlr, data|Sclk);
		csr9w(ctlr, data);
	}

	/*
	 * First time through must work out the EEPROM size.
	 * This doesn't seem to work on the 21041 as implemented
	 * in Virtual PC for the Mac, so wire any 21041 to 6,
	 * it's the only 21041 this code will ever likely see.
	 */
	if((size = ctlr->sromsz) == 0){
		if(ctlr->id == Tulip1)
			ctlr->sromsz = size = 6;
		else
			size = 8;
	}

	for(size = size-1; size >= 0; size--){
		data = Rd|Ss|(((r>>size) & 0x01)<<2)|Scs;
		csr9w(ctlr, data);
		csr9w(ctlr, data|Sclk);
		csr9w(ctlr, data);
		microdelay(1);
		if(ctlr->sromsz == 0 && !(csr32r(ctlr, 9) & Sdo))
			break;
	}

	data = 0;
	for(i = 16-1; i >= 0; i--){
		csr9w(ctlr, Rd|Ss|Sclk|Scs);
		if(csr32r(ctlr, 9) & Sdo)
			data |= (1<<i);
		csr9w(ctlr, Rd|Ss|Scs);
	}

	csr9w(ctlr, 0);

	if(ctlr->sromsz == 0){
		ctlr->sromsz = 8-size;
		goto reread;
	}

	return data & 0xFFFF;
}

static void
shutdown(Ether* ether)
{
	Ctlr *ctlr = ether->ctlr;

print("ether2114x shutting down\n");
	csr32w(ctlr, 0, Swr);
}

static void
softreset(Ctlr* ctlr)
{
	/*
	 * Soft-reset the controller and initialise bus mode.
	 * Delay should be >= 50 PCI cycles (2×S @ 25MHz).
	 */
	csr32w(ctlr, 0, Swr);
	microdelay(10);
	csr32w(ctlr, 0, Rml|Cal16);
	delay(1);
}

static int
type5block(Ctlr* ctlr, uchar* block)
{
	int csr15, i, len;

	/*
	 * Reset or GPR sequence. Reset should be once only,
	 * before the GPR sequence.
	 * Note 'block' is not a pointer to the block head but
	 * a pointer to the data in the block starting at the
	 * reset length value so type5block can be used for the
	 * sequences contained in type 1 and type 3 blocks.
	 * The SROM docs state the 21140 type 5 block is the
	 * same as that for the 21143, but the two controllers
	 * use different registers and sequence-element lengths
	 * so the 21140 code here is a guess for a real type 5
	 * sequence.
	 */
	len = *block++;
	if(ctlr->id != Tulip3){
		for(i = 0; i < len; i++){
			csr32w(ctlr, 12, *block);
			block++;
		}
		return len;
	}

	for(i = 0; i < len; i++){
		csr15 = *block++<<16;
		csr15 |= *block++<<24;
		csr32w(ctlr, 15, csr15);
		debug("%8.8uX ", csr15);
	}
	return 2*len;
}

static int
typephylink(Ctlr* ctlr, uchar*)
{
	int an, bmcr, bmsr, csr6, x;

	/*
	 * Fail if
	 *	auto-negotiataion enabled but not complete;
	 *	no valid link established.
	 */
	bmcr = miir(ctlr, ctlr->curphyad, Bmcr);
	miir(ctlr, ctlr->curphyad, Bmsr);
	bmsr = miir(ctlr, ctlr->curphyad, Bmsr);
	debug("bmcr 0x%2.2uX bmsr 0x%2.2uX\n", bmcr, bmsr);
	if(((bmcr & 0x1000) && !(bmsr & 0x0020)) || !(bmsr & 0x0004))
		return 0;

	if(bmcr & 0x1000){
		an = miir(ctlr, ctlr->curphyad, Anar);
		an &= miir(ctlr, ctlr->curphyad, Anlpar) & 0x3E0;
		debug("an 0x%2.uX 0x%2.2uX 0x%2.2uX\n",
	    		miir(ctlr, ctlr->curphyad, Anar),
			miir(ctlr, ctlr->curphyad, Anlpar),
			an);
	
		if(an & 0x0100)
			x = 0x4000;
		else if(an & 0x0080)
			x = 0x2000;
		else if(an & 0x0040)
			x = 0x1000;
		else if(an & 0x0020)
			x = 0x0800;
		else
			x = 0;
	}
	else if((bmcr & 0x2100) == 0x2100)
		x = 0x4000;
	else if(bmcr & 0x2000){
		/*
		 * If FD capable, force it if necessary.
		 */
		if((bmsr & 0x4000) && ctlr->fd){
			miiw(ctlr, ctlr->curphyad, Bmcr, 0x2100);
			x = 0x4000;
		}
		else
			x = 0x2000;
	}
	else if(bmcr & 0x0100)
		x = 0x1000;
	else
		x = 0x0800;

	csr6 = Sc|Mbo|Hbd|Ps|Ca|TrMODE|Sb;
	if(ctlr->fdx & x)
		csr6 |= Fd;
	if(ctlr->ttm & x)
		csr6 |= Ttm;
	debug("csr6 0x%8.8uX 0x%8.8uX 0x%8.8luX\n",
		csr6, ctlr->csr6, csr32r(ctlr, 6));
	if(csr6 != ctlr->csr6){
		ctlr->csr6 = csr6;
		csr32w(ctlr, 6, csr6);
	}

	return 1;
}

static int
typephymode(Ctlr* ctlr, uchar* block, int wait)
{
	uchar *p;
	int len, mc, nway, phyx, timeo;

	if(DEBUG){
		int i;

		len = (block[0] & ~0x80)+1;
		for(i = 0; i < len; i++)
			debug("%2.2uX ", block[i]);
		debug("\n");
	}

	if(block[1] == 1)
		len = 1;
	else if(block[1] == 3)
		len = 2;
	else
		return -1;

	/*
	 * Snarf the media capabilities, nway advertisment,
	 * FDX and TTM bitmaps.
	 */
	p = &block[5+len*block[3]+len*block[4+len*block[3]]];
	mc = *p++;
	mc |= *p++<<8;
	nway = *p++;
	nway |= *p++<<8;
	ctlr->fdx = *p++;
	ctlr->fdx |= *p++<<8;
	ctlr->ttm = *p++;
	ctlr->ttm |= *p<<8;
	debug("mc %4.4uX nway %4.4uX fdx %4.4uX ttm %4.4uX\n",
		mc, nway, ctlr->fdx, ctlr->ttm);
	USED(mc);

	phyx = block[2];
	ctlr->curphyad = ctlr->phy[phyx];

	ctlr->csr6 = 0;		/* Sc|Mbo|Hbd|Ps|Ca|TrMODE|Sb; */
	// csr32w(ctlr, 6, ctlr->csr6);
	if(typephylink(ctlr, block))
		return 0;

	if(!(ctlr->phyreset & (1<<phyx))){
		debug("reset seq: len %d: ", block[3]);
		if(ctlr->type5block)
			type5block(ctlr, &ctlr->type5block[2]);
		else
			type5block(ctlr, &block[4+len*block[3]]);
		debug("\n");
		ctlr->phyreset |= (1<<phyx);
	}

	/*
	 * GPR sequence.
	 */
	debug("gpr seq: len %d: ", block[3]);
	type5block(ctlr, &block[3]);
	debug("\n");

	ctlr->csr6 = 0;		/* Sc|Mbo|Hbd|Ps|Ca|TrMODE|Sb; */
	// csr32w(ctlr, 6, ctlr->csr6);
	if(typephylink(ctlr, block))
		return 0;

	/*
	 * Turn off auto-negotiation, set the auto-negotiation
	 * advertisment register then start the auto-negotiation
	 * process again.
	 */
	miiw(ctlr, ctlr->curphyad, Bmcr, 0);
	miiw(ctlr, ctlr->curphyad, Anar, nway|1);
	miiw(ctlr, ctlr->curphyad, Bmcr, 0x1000);

	if(!wait)
		return 0;

	for(timeo = 0; timeo < 45; timeo++){
		if(typephylink(ctlr, block))
			return 0;
		delay(100);
	}

	return -1;
}

static int
typesymmode(Ctlr *ctlr, uchar *block, int wait)
{
	uint gpmode, gpdata, command;

	USED(wait);
	gpmode = block[3] | ((uint) block[4] << 8);
	gpdata = block[5] | ((uint) block[6] << 8);
	command = (block[7] | ((uint) block[8] << 8)) & 0x71;
	if (command & 0x8000) {
		print("ether2114x.c: FIXME: handle type 4 mode blocks where cmd.active_invalid != 0\n");
		return -1;
	}
	csr32w(ctlr, 15, gpmode);
	csr32w(ctlr, 15, gpdata);
	ctlr->csr6 = (command & 0x71) << 18;
	csr32w(ctlr, 6, ctlr->csr6);
	return 0;
}

static int
type2mode(Ctlr* ctlr, uchar* block, int)
{
	uchar *p;
	int csr6, csr13, csr14, csr15, gpc, gpd;

	csr6 = Sc|Mbo|Ca|TrMODE|Sb;
	debug("type2mode: medium 0x%2.2uX\n", block[2]);

	/*
	 * Don't attempt full-duplex
	 * unless explicitly requested.
	 */
	if((block[2] & 0x3F) == 0x04){	/* 10BASE-TFD */
		if(!ctlr->fd)
			return -1;
		csr6 |= Fd;
	}

	/*
	 * Operating mode programming values from the datasheet
	 * unless media specific data is explicitly given.
	 */
	p = &block[3];
	if(block[2] & 0x40){
		csr13 = (block[4]<<8)|block[3];
		csr14 = (block[6]<<8)|block[5];
		csr15 = (block[8]<<8)|block[7];
		p += 6;
	}
	else switch(block[2] & 0x3F){
	default:
		return -1;
	case 0x00:			/* 10BASE-T */
		csr13 = 0x00000001;
		csr14 = 0x00007F3F;
		csr15 = 0x00000008;
		break;
	case 0x01:			/* 10BASE-2 */
		csr13 = 0x00000009;
		csr14 = 0x00000705;
		csr15 = 0x00000006;
		break;
	case 0x02:			/* 10BASE-5 (AUI) */
		csr13 = 0x00000009;
		csr14 = 0x00000705;
		csr15 = 0x0000000E;
		break;
	case 0x04:			/* 10BASE-TFD */
		csr13 = 0x00000001;
		csr14 = 0x00007F3D;
		csr15 = 0x00000008;
		break;
	}
	gpc = *p++<<16;
	gpc |= *p++<<24;
	gpd = *p++<<16;
	gpd |= *p<<24;

	csr32w(ctlr, 13, 0);
	csr32w(ctlr, 14, csr14);
	csr32w(ctlr, 15, gpc|csr15);
	delay(10);
	csr32w(ctlr, 15, gpd|csr15);
	csr32w(ctlr, 13, csr13);

	ctlr->csr6 = csr6;
	csr32w(ctlr, 6, ctlr->csr6);

	debug("type2mode: csr13 %8.8uX csr14 %8.8uX csr15 %8.8uX\n",
		csr13, csr14, csr15);
	debug("type2mode: gpc %8.8uX gpd %8.8uX csr6 %8.8uX\n",
		gpc, gpd, csr6);

	return 0;
}

static int
type0link(Ctlr* ctlr, uchar* block)
{
	int m, polarity, sense;

	m = (block[3]<<8)|block[2];
	sense = 1<<((m & 0x000E)>>1);
	if(m & 0x0080)
		polarity = sense;
	else
		polarity = 0;

	return (csr32r(ctlr, 12) & sense)^polarity;
}

static int
type0mode(Ctlr* ctlr, uchar* block, int wait)
{
	int csr6, m, timeo;

	csr6 = Sc|Mbo|Hbd|Ca|TrMODE|Sb;
debug("type0: medium 0x%uX, fd %d: 0x%2.2uX 0x%2.2uX 0x%2.2uX 0x%2.2uX\n",
    ctlr->medium, ctlr->fd, block[0], block[1], block[2], block[3]); 
	switch(block[0]){
	default:
		break;

	case 0x04:			/* 10BASE-TFD */
	case 0x05:			/* 100BASE-TXFD */
	case 0x08:			/* 100BASE-FXFD */
		/*
		 * Don't attempt full-duplex
		 * unless explicitly requested.
		 */
		if(!ctlr->fd)
			return -1;
		csr6 |= Fd;
		break;
	}

	m = (block[3]<<8)|block[2];
	if(m & 0x0001)
		csr6 |= Ps;
	if(m & 0x0010)
		csr6 |= Ttm;
	if(m & 0x0020)
		csr6 |= Pcs;
	if(m & 0x0040)
		csr6 |= Scr;

	csr32w(ctlr, 12, block[1]);
	microdelay(10);
	csr32w(ctlr, 6, csr6);
	ctlr->csr6 = csr6;

	if(!wait)
		return 0;

	for(timeo = 0; timeo < 30; timeo++){
		if(type0link(ctlr, block))
			return 0;
		delay(100);
	}

	return -1;
}

static int
media21041(Ether* ether, int wait)
{
	Ctlr* ctlr;
	uchar *block;
	int csr6, csr13, csr14, csr15, medium, timeo;

	ctlr = ether->ctlr;
	block = ctlr->infoblock[ctlr->curk];
	debug("media21041: block[0] %2.2uX, medium %4.4uX sct %4.4uX\n",
		block[0], ctlr->medium, ctlr->sct);

	medium = block[0] & 0x3F;
	if(ctlr->medium >= 0 && medium != ctlr->medium)
		return 0;
	if(ctlr->sct != 0x0800 && (ctlr->sct & 0x3F) != medium)
		return 0;

	csr6 = Sc|Mbo|Ca|TrMODE|Sb;
	if(block[0] & 0x40){
		csr13 = (block[2]<<8)|block[1];
		csr14 = (block[4]<<8)|block[3];
		csr15 = (block[6]<<8)|block[5];
	}
	else switch(medium){
	default:
		return -1;
	case 0x00:		/* 10BASE-T */
		csr13 = 0xEF01;
		csr14 = 0xFF3F;
		csr15 = 0x0008;
		break;
	case 0x01:		/* 10BASE-2 */
		csr13 = 0xEF09;
		csr14 = 0xF73D;
		csr15 = 0x0006;
		break;
	case 0x02:		/* 10BASE-5 */
		csr13 = 0xEF09;
		csr14 = 0xF73D;
		csr15 = 0x000E;
		break;
	case 0x04:		/* 10BASE-TFD */
		csr13 = 0xEF01;
		csr14 = 0xFF3D;
		csr15 = 0x0008;
		break;
	}

	csr32w(ctlr, 13, 0);
	csr32w(ctlr, 14, csr14);
	csr32w(ctlr, 15, csr15);
	csr32w(ctlr, 13, csr13);
	delay(10);

	if(medium == 0x04)
		csr6 |= Fd;
	ctlr->csr6 = csr6;
	csr32w(ctlr, 6, ctlr->csr6);

	debug("media21041: csr6 %8.8uX csr13 %4.4uX csr14 %4.4uX csr15 %4.4uX\n",
		csr6, csr13, csr14, csr15);

	if(!wait)
		return 0;

	for(timeo = 0; timeo < 30; timeo++){
		if(!(csr32r(ctlr, 12) & 0x0002)){
			debug("media21041: ok: csr12 %4.4luX timeo %d\n",
				csr32r(ctlr, 12), timeo);
			return 10;
		}
		delay(100);
	}
	debug("media21041: !ok: csr12 %4.4luX\n", csr32r(ctlr, 12));

	return -1;
}

static int
mediaxx(Ether* ether, int wait)
{
	Ctlr* ctlr;
	uchar *block;

	ctlr = ether->ctlr;
	block = ctlr->infoblock[ctlr->curk];
	if(block[0] & 0x80){
		switch(block[1]){
		default:
			return -1;
		case 0:
			if(ctlr->medium >= 0 && block[2] != ctlr->medium)
				return 0;
/* need this test? */	if(ctlr->sct != 0x0800 && (ctlr->sct & 0x3F) != block[2])
				return 0;
			if(type0mode(ctlr, block+2, wait))
				return 0;
			break;
		case 1:
			if(typephymode(ctlr, block, wait))
				return 0;
			break;
		case 2:
			debug("type2: medium %d block[2] %d\n",
				ctlr->medium, block[2]);
			if(ctlr->medium >= 0 && ((block[2] & 0x3F) != ctlr->medium))
				return 0;
			if(type2mode(ctlr, block, wait))
				return 0;
			break;
		case 3:
			if(typephymode(ctlr, block, wait))
				return 0;
			break;
		case 4:
			debug("type4: medium %d block[2] %d\n",
				ctlr->medium, block[2]);
			if(ctlr->medium >= 0 && ((block[2] & 0x3F) != ctlr->medium))
				return 0;
			if(typesymmode(ctlr, block, wait))
				return 0;
			break;
		}
	}
	else{
		if(ctlr->medium >= 0 && block[0] != ctlr->medium)
			return 0;
/* need this test? */if(ctlr->sct != 0x0800 && (ctlr->sct & 0x3F) != block[0])
			return 0;
		if(type0mode(ctlr, block, wait))
			return 0;
	}

	if(ctlr->csr6){
		if(!(ctlr->csr6 & Ps) || (ctlr->csr6 & Ttm))
			return 10;
		return 100;
	}

	return 0;
}

static int
media(Ether* ether, int wait)
{
	Ctlr* ctlr;
	int k, mbps;

	ctlr = ether->ctlr;
	for(k = 0; k < ctlr->k; k++){
		switch(ctlr->id){
		default:
			mbps = mediaxx(ether, wait);
			break;
		case Tulip1:			/* 21041 */
			mbps = media21041(ether, wait);
			break;
		}
		if(mbps > 0)
			return mbps;
		if(ctlr->curk == 0)
			ctlr->curk = ctlr->k-1;
		else
			ctlr->curk--;
	}

	return 0;
}

static char* mediatable[9] = {
	"10BASE-T",				/* TP */
	"10BASE-2",				/* BNC */
	"10BASE-5",				/* AUI */
	"100BASE-TX",
	"10BASE-TFD",
	"100BASE-TXFD",
	"100BASE-T4",
	"100BASE-FX",
	"100BASE-FXFD",
};

static uchar en1207[] = {		/* Accton EN1207-COMBO */
	0x00, 0x00, 0xE8,		/* [0]  vendor ethernet code */
	0x00,				/* [3]  spare */

	0x00, 0x08,			/* [4]  connection (LSB+MSB = 0x0800) */
	0x1F,				/* [6]  general purpose control */
	2,				/* [7]  block count */

	0x00,				/* [8]  media code (10BASE-TX) */
	0x0B,				/* [9]  general purpose port data */
	0x9E, 0x00,			/* [10] command (LSB+MSB = 0x009E) */

	0x03,				/* [8]  media code (100BASE-TX) */
	0x1B,				/* [9]  general purpose port data */
	0x6D, 0x00,			/* [10] command (LSB+MSB = 0x006D) */

					/* There is 10BASE-2 as well, but... */
};

static uchar ana6910fx[] = {		/* Adaptec (Cogent) ANA-6910FX */
	0x00, 0x00, 0x92,		/* [0]  vendor ethernet code */
	0x00,				/* [3]  spare */

	0x00, 0x08,			/* [4]  connection (LSB+MSB = 0x0800) */
	0x3F,				/* [6]  general purpose control */
	1,				/* [7]  block count */

	0x07,				/* [8]  media code (100BASE-FX) */
	0x03,				/* [9]  general purpose port data */
	0x2D, 0x00			/* [10] command (LSB+MSB = 0x000D) */
};

static uchar smc9332[] = {		/* SMC 9332 */
	0x00, 0x00, 0xC0,		/* [0]  vendor ethernet code */
	0x00,				/* [3]  spare */

	0x00, 0x08,			/* [4]  connection (LSB+MSB = 0x0800) */
	0x1F,				/* [6]  general purpose control */
	2,				/* [7]  block count */

	0x00,				/* [8]  media code (10BASE-TX) */
	0x00,				/* [9]  general purpose port data */
	0x9E, 0x00,			/* [10] command (LSB+MSB = 0x009E) */

	0x03,				/* [8]  media code (100BASE-TX) */
	0x09,				/* [9]  general purpose port data */
	0x6D, 0x00,			/* [10] command (LSB+MSB = 0x006D) */
};

static uchar* leaf21140[] = {
	en1207,				/* Accton EN1207-COMBO */
	ana6910fx,			/* Adaptec (Cogent) ANA-6910FX */
	smc9332,			/* SMC 9332 */
	nil,
};

/*
 * Copied to ctlr->srom at offset 20.
 */
static uchar leafpnic[] = {
	0x00, 0x00, 0x00, 0x00,		/* MAC address */
	0x00, 0x00,
	0x00,				/* controller 0 device number */
	0x1E, 0x00,			/* controller 0 info leaf offset */
	0x00,				/* reserved */
	0x00, 0x08,			/* selected connection type */
	0x00,				/* general purpose control */
	0x01,				/* block count */

	0x8C,				/* format indicator and count */
	0x01,				/* block type */
	0x00,				/* PHY number */
	0x00,				/* GPR sequence length */
	0x00,				/* reset sequence length */
	0x00, 0x78,			/* media capabilities */
	0xE0, 0x01,			/* Nway advertisment */
	0x00, 0x50,			/* FDX bitmap */
	0x00, 0x18,			/* TTM bitmap */
};

static int
srom(Ctlr* ctlr)
{
	int i, k, oui, phy, x;
	uchar *p;

	/*
	 * This is a partial decoding of the SROM format described in
	 * 'Digital Semiconductor 21X4 Serial ROM Format, Version 4.05,
	 * 2-Mar-98'. Only the 2114[03] are handled, support for other
	 * controllers can be added as needed.
	 * Do a dummy read first to get the size and allocate ctlr->srom.
	 */
	sromr(ctlr, 0);
	if(ctlr->srom == nil)
		ctlr->srom = malloc((1<<ctlr->sromsz)*sizeof(ushort));
	if(ctlr->srom == nil)
		error(Enomem);
	for(i = 0; i < (1<<ctlr->sromsz); i++){
		x = sromr(ctlr, i);
		ctlr->srom[2*i] = x;
		ctlr->srom[2*i+1] = x>>8;
	}

	if(DEBUG){
		print("srom:");
		for(i = 0; i < ((1<<ctlr->sromsz)*sizeof(ushort)); i++){
			if(i && ((i & 0x0F) == 0))
				print("\n     ");
			print(" %2.2uX", ctlr->srom[i]);
		}
		print("\n");
	}

	/*
	 * There are at least 2 SROM layouts:
	 *	e.g. Digital EtherWORKS	station address at offset 20;
	 *				this complies with the 21140A SROM
	 *				application note from Digital;
	 * 	e.g. SMC9332		station address at offset 0 followed by
	 *				2 additional bytes, repeated at offset
	 *				6; the 8 bytes are also repeated in
	 *				reverse order at offset 8.
	 * To check which it is, read the SROM and check for the repeating
	 * patterns of the non-compliant cards; if that fails use the one at
	 * offset 20.
	 */
	ctlr->sromea = ctlr->srom;
	for(i = 0; i < 8; i++){
		x = ctlr->srom[i];
		if(x != ctlr->srom[15-i] || x != ctlr->srom[16+i]){
			ctlr->sromea = &ctlr->srom[20];
			break;
		}
	}

	/*
	 * Fake up the SROM for the PNIC and AMDtek.
	 * They look like a 21140 with a PHY.
	 * The MAC address is byte-swapped in the orginal
	 * PNIC SROM data.
	 */
	if(ctlr->id == Pnic){
		memmove(&ctlr->srom[20], leafpnic, sizeof(leafpnic));
		for(i = 0; i < Eaddrlen; i += 2){
			ctlr->srom[20+i] = ctlr->srom[i+1];
			ctlr->srom[20+i+1] = ctlr->srom[i];
		}
	}
	if(ctlr->id == CentaurP || ctlr->id == CentaurPcb){
		memmove(&ctlr->srom[20], leafpnic, sizeof(leafpnic));
		for(i = 0; i < Eaddrlen; i += 2){
			ctlr->srom[20+i] = ctlr->srom[8+i];
			ctlr->srom[20+i+1] = ctlr->srom[8+i+1];
		}
	}

	/*
	 * Next, try to find the info leaf in the SROM for media detection.
	 * If it's a non-conforming card try to match the vendor ethernet code
	 * and point p at a fake info leaf with compact 21140 entries.
	 */
	if(ctlr->sromea == ctlr->srom){
		p = nil;
		for(i = 0; leaf21140[i] != nil; i++){
			if(memcmp(leaf21140[i], ctlr->sromea, 3) == 0){
				p = &leaf21140[i][4];
				break;
			}
		}
		if(p == nil)
			return -1;
	}
	else
		p = &ctlr->srom[(ctlr->srom[28]<<8)|ctlr->srom[27]];

	/*
	 * Set up the info needed for later media detection.
	 * For the 21140, set the general-purpose mask in CSR12.
	 * The info block entries are stored in order of increasing
	 * precedence, so detection will work backwards through the
	 * stored indexes into ctlr->srom.
	 * If an entry is found which matches the selected connection
	 * type, save the index. Otherwise, start at the last entry.
	 * If any MII entries are found (type 1 and 3 blocks), scan
	 * for PHYs.
	 */
	ctlr->leaf = p;
	ctlr->sct = *p++;
	ctlr->sct |= *p++<<8;
	if(ctlr->id != Tulip3 && ctlr->id != Tulip1){
		csr32w(ctlr, 12, Gpc|*p++);
		delay(200);
	}
	ctlr->k = *p++;
	if(ctlr->k >= nelem(ctlr->infoblock))
		ctlr->k = nelem(ctlr->infoblock)-1;
	ctlr->sctk = ctlr->k-1;
	phy = 0;
	for(k = 0; k < ctlr->k; k++){
		ctlr->infoblock[k] = p;
		if(ctlr->id == Tulip1){
			debug("type21041: 0x%2.2uX\n", p[0]); 
			if(ctlr->sct != 0x0800 && *p == (ctlr->sct & 0xFF))
				ctlr->sctk = k;
			if(*p & 0x40)
				p += 7;
			else
				p += 1;
		}
		/*
		 * The RAMIX PMC665 has a badly-coded SROM,
		 * hence the test for 21143 and type 3.
		 */
		else if((*p & 0x80) || (ctlr->id == Tulip3 && *(p+1) == 3)){
			*p |= 0x80;
			if(*(p+1) == 1 || *(p+1) == 3)
				phy = 1;
			if(*(p+1) == 5)
				ctlr->type5block = p;
			p += (*p & ~0x80)+1;
		}
		else{
			debug("type0: 0x%2.2uX 0x%2.2uX 0x%2.2uX 0x%2.2uX\n",
				p[0], p[1], p[2], p[3]); 
			if(ctlr->sct != 0x0800 && *p == (ctlr->sct & 0xFF))
				ctlr->sctk = k;
			p += 4;
		}
	}
	ctlr->curk = ctlr->sctk;
	debug("sct 0x%uX medium 0x%uX k %d curk %d phy %d\n",
		ctlr->sct, ctlr->medium, ctlr->k, ctlr->curk, phy);

	if(phy){
		x = 0;
		for(k = 0; k < nelem(ctlr->phy); k++){
			if((ctlr->id == CentaurP || ctlr->id == CentaurPcb) && k != 1)
				continue;
			if((oui = miir(ctlr, k, 2)) == -1 || oui == 0)
				continue;
			debug("phy reg 2 %4.4uX\n", oui);
			if(DEBUG){
				oui = (oui & 0x3FF)<<6;
				oui |= miir(ctlr, k, 3)>>10;
				miir(ctlr, k, 1);
				debug("phy%d: index %d oui %uX reg1 %uX\n",
					x, k, oui, miir(ctlr, k, 1));
				USED(oui);
			}
			ctlr->phy[x] = k;
		}
	}

	ctlr->fd = 0;
	ctlr->medium = -1;

	return 0;
}

static void
dec2114xpci(void)
{
	Ctlr *ctlr;
	Pcidev *p;
	int x;

	p = nil;
	while(p = pcimatch(p, 0, 0)){
		if(p->ccrb != 0x02 || p->ccru != 0)
			continue;
		switch((p->did<<16)|p->vid){
		default:
			continue;

		case Tulip3:			/* 21143 */
			/*
			 * Exit sleep mode.
			 */
			x = pcicfgr32(p, 0x40);
			x &= ~0xC0000000;
			pcicfgw32(p, 0x40, x);
			/*FALLTHROUGH*/

		case Tulip0:			/* 21140 */
		case Tulip1:			/* 21041 */
		case Pnic:			/* PNIC */
		case Pnic2:			/* PNIC-II */
		case CentaurP:			/* ADMtek */
		case CentaurPcb:		/* ADMtek CardBus */
			break;
		}

		/*
		 * bar[0] is the I/O port register address and
		 * bar[1] is the memory-mapped register address.
		 */
		ctlr = malloc(sizeof(Ctlr));
		if(ctlr == nil)
			error(Enomem);
		ctlr->port = p->mem[0].bar & ~0x01;
		ctlr->pcidev = p;
		ctlr->id = (p->did<<16)|p->vid;

		if(ioalloc(ctlr->port, p->mem[0].size, 0, "dec2114x") < 0){
			print("dec2114x: port 0x%uX in use\n", ctlr->port);
			free(ctlr);
			continue;
		}

		/*
		 * Some cards (e.g. ANA-6910FX) seem to need the Ps bit
		 * set or they don't always work right after a hardware
		 * reset.
		 */
		csr32w(ctlr, 6, Mbo|Ps);
		softreset(ctlr);

		if(srom(ctlr)){
			iofree(ctlr->port);
			free(ctlr);
			continue;
		}

		switch(ctlr->id){
		default:
			break;
		case Pnic:			/* PNIC */
			/*
			 * Turn off the jabber timer.
			 */
			csr32w(ctlr, 15, 0x00000001);
			break;
		case CentaurP:
		case CentaurPcb:
			/*
			 * Nice - the register offsets change from *8 to *4
			 * for CSR16 and up...
			 * CSR25/26 give the MAC address read from the SROM.
			 * Don't really need to use this other than as a check,
			 * the SROM will be read in anyway so the value there
			 * can be used directly.
			 */
			debug("csr25 %8.8luX csr26 %8.8luX\n",
				inl(ctlr->port+0xA4), inl(ctlr->port+0xA8));
			debug("phyidr1 %4.4luX phyidr2 %4.4luX\n",
				inl(ctlr->port+0xBC), inl(ctlr->port+0xC0));
			break;
		}

		if(ctlrhead != nil)
			ctlrtail->next = ctlr;
		else
			ctlrhead = ctlr;
		ctlrtail = ctlr;
	}
}

static int
reset(Ether* ether)
{
	Ctlr *ctlr;
	int i, x;
	uchar ea[Eaddrlen];
	static int scandone;

	if(scandone == 0){
		dec2114xpci();
		scandone = 1;
	}

	/*
	 * Any adapter matches if no ether->port is supplied,
	 * otherwise the ports must match.
	 */
	for(ctlr = ctlrhead; ctlr != nil; ctlr = ctlr->next){
		if(ctlr->active)
			continue;
		if(ether->port == 0 || ether->port == ctlr->port){
			ctlr->active = 1;
			break;
		}
	}
	if(ctlr == nil)
		return -1;

	ether->ctlr = ctlr;
	ether->port = ctlr->port;
	ether->irq = ctlr->pcidev->intl;
	ether->tbdf = ctlr->pcidev->tbdf;

	/*
	 * Check if the adapter's station address is to be overridden.
	 * If not, read it from the EEPROM and set in ether->ea prior to
	 * loading the station address in the hardware.
	 */
	memset(ea, 0, Eaddrlen);
	if(memcmp(ea, ether->ea, Eaddrlen) == 0)
		memmove(ether->ea, ctlr->sromea, Eaddrlen);

	/*
	 * Look for a medium override in case there's no autonegotiation
	 * (no MII) or the autonegotiation fails.
	 */
	for(i = 0; i < ether->nopt; i++){
		if(cistrcmp(ether->opt[i], "FD") == 0){
			ctlr->fd = 1;
			continue;
		}
		for(x = 0; x < nelem(mediatable); x++){
			debug("compare <%s> <%s>\n", mediatable[x],
				ether->opt[i]);
			if(cistrcmp(mediatable[x], ether->opt[i]))
				continue;
			ctlr->medium = x;
	
			switch(ctlr->medium){
			default:
				ctlr->fd = 0;
				break;
	
			case 0x04:		/* 10BASE-TFD */
			case 0x05:		/* 100BASE-TXFD */
			case 0x08:		/* 100BASE-FXFD */
				ctlr->fd = 1;
				break;
			}
			break;
		}
	}

	ether->mbps = media(ether, 1);

	/*
	 * Initialise descriptor rings, ethernet address.
	 */
	ctlr->nrdr = Nrde;
	ctlr->ntdr = Ntde;
	pcisetbme(ctlr->pcidev);
	ctlrinit(ether);

	/*
	 * Linkage to the generic ethernet driver.
	 */
	ether->attach = attach;
	ether->transmit = transmit;
	ether->interrupt = interrupt;
	ether->ifstat = ifstat;

	ether->arg = ether;
	ether->shutdown = shutdown;
	ether->multicast = multicast;
	ether->promiscuous = promiscuous;

	return 0;
}

void
ether2114xlink(void)
{
	addethercard("2114x",  reset);
	addethercard("21140",  reset);
}