/* * AMD79C970 * PCnet-PCI Single-Chip Ethernet Controller for PCI Local Bus * To do: *	finish this rewrite */#include "u.h"#include "lib.h"#include "mem.h"#include "dat.h"#include "fns.h"#include "io.h"#include "etherif.h"enum {	Lognrdre	= 6,	Nrdre		= (1<<Lognrdre),/* receive descriptor ring entries */	Logntdre	= 4,	Ntdre		= (1<<Logntdre),/* transmit descriptor ring entries */	Rbsize		= ETHERMAXTU+4,	/* ring buffer size (+4 for CRC) */};enum {					/* DWIO I/O resource map */	Aprom		= 0x0000,	/* physical address */	Rdp		= 0x0010,	/* register data port */	Rap		= 0x0014,	/* register address port */	Sreset		= 0x0018,	/* software reset */	Bdp		= 0x001C,	/* bus configuration register data port */};enum {					/* CSR0 */	Init		= 0x0001,	/* begin initialisation */	Strt		= 0x0002,	/* enable chip */	Stop		= 0x0004,	/* disable chip */	Tdmd		= 0x0008,	/* transmit demand */	Txon		= 0x0010,	/* transmitter on */	Rxon		= 0x0020,	/* receiver on */	Iena		= 0x0040,	/* interrupt enable */	Intr		= 0x0080,	/* interrupt flag */	Idon		= 0x0100,	/* initialisation done */	Tint		= 0x0200,	/* transmit interrupt */	Rint		= 0x0400,	/* receive interrupt */	Merr		= 0x0800,	/* memory error */	Miss		= 0x1000,	/* missed frame */	Cerr		= 0x2000,	/* collision */	Babl		= 0x4000,	/* transmitter timeout */	Err		= 0x8000,	/* Babl|Cerr|Miss|Merr */};	enum {					/* CSR3 */	Bswp		= 0x0004,	/* byte swap */	Emba		= 0x0008,	/* enable modified back-off algorithm */	Dxmt2pd		= 0x0010,	/* disable transmit two part deferral */	Lappen		= 0x0020,	/* look-ahead packet processing enable */};enum {					/* CSR4 */	ApadXmt		= 0x0800,	/* auto pad transmit */};enum {					/* CSR15 */	Prom		= 0x8000,	/* promiscuous mode */};typedef struct {			/* Initialisation Block */	ushort	mode;	uchar	rlen;			/* upper 4 bits */	uchar	tlen;			/* upper 4 bits */	uchar	padr[6];	uchar	res[2];	uchar	ladr[8];	ulong	rdra;	ulong	tdra;} Iblock;typedef struct {			/* descriptor ring entry */	ulong	addr;	ulong	md1;			/* status|bcnt */	ulong	md2;			/* rcc|rpc|mcnt */	void*	data;} Dre;enum {					/* md1 */	Enp		= 0x01000000,	/* end of packet */	Stp		= 0x02000000,	/* start of packet */	RxBuff		= 0x04000000,	/* buffer error */	Def		= 0x04000000,	/* deferred */	Crc		= 0x08000000,	/* CRC error */	One		= 0x08000000,	/* one retry needed */	Oflo		= 0x10000000,	/* overflow error */	More		= 0x10000000,	/* more than one retry needed */	Fram		= 0x20000000,	/* framing error */	RxErr		= 0x40000000,	/* Fram|Oflo|Crc|RxBuff */	TxErr		= 0x40000000,	/* Uflo|Lcol|Lcar|Rtry */	Own		= 0x80000000,};enum {					/* md2 */	Rtry		= 0x04000000,	/* failed after repeated retries */	Lcar		= 0x08000000,	/* loss of carrier */	Lcol		= 0x10000000,	/* late collision */	Uflo		= 0x40000000,	/* underflow error */	TxBuff		= 0x80000000,	/* buffer error */};typedef struct Ctlr Ctlr;struct Ctlr {	Lock;	int	port;	Pcidev*	pcidev;	Ctlr*	next;	int	active;	int	init;			/* initialisation in progress */	Iblock	iblock;	Dre*	rdr;			/* receive descriptor ring */	int	rdrx;	Dre*	tdr;			/* transmit descriptor ring */	int	tdrh;			/* host index into tdr */	int	tdri;			/* interface index into tdr */	int	ntq;			/* descriptors active */	ulong	rxbuff;			/* receive statistics */	ulong	crc;	ulong	oflo;	ulong	fram;	ulong	rtry;			/* transmit statistics */	ulong	lcar;	ulong	lcol;	ulong	uflo;	ulong	txbuff;	ulong	merr;			/* bobf is such a whiner */	ulong	miss;	ulong	babl;	int		(*ior)(Ctlr*, int);	void		(*iow)(Ctlr*, int, int);};static Ctlr* ctlrhead;static Ctlr* ctlrtail;/* * The Rdp, Rap, Sreset, Bdp ports are 32-bit port offset in the enumeration above. * To get to 16-bit offsets, scale down with 0x10 staying the same. */static intio16r(Ctlr* c, int r){	if(r >= Rdp)		r = (r-Rdp)/2+Rdp;	return ins(c->port+r);}static voidio16w(Ctlr* c, int r, int v){	if(r >= Rdp)		r = (r-Rdp)/2+Rdp;	outs(c->port+r, v);}static intio32r(Ctlr* c, int r){	return inl(c->port+r);}static voidio32w(Ctlr* c, int r, int v){	outl(c->port+r, v);}static voidattach(Ether*){}static voiddetach(Ether* ether){	Ctlr *ctlr;	ctlr = ether->ctlr;	ctlr->iow(ctlr, Rdp, Iena|Stop);}static voidringinit(Ctlr* ctlr){	Dre *dre;	/*	 * Initialise the receive and transmit buffer rings.	 * The ring entries must be aligned on 16-byte boundaries.	 *	 * This routine is protected by ctlr->init.	 */	if(ctlr->rdr == 0){		ctlr->rdr = ialloc(Nrdre*sizeof(Dre), 0x10);		for(dre = ctlr->rdr; dre < &ctlr->rdr[Nrdre]; dre++){			dre->data = malloc(Rbsize);			dre->addr = PADDR(dre->data);			dre->md2 = 0;			dre->md1 = Own|(-Rbsize & 0xFFFF);		}	}	ctlr->rdrx = 0;	if(ctlr->tdr == 0)		ctlr->tdr = ialloc(Ntdre*sizeof(Dre), 0x10);	memset(ctlr->tdr, 0, Ntdre*sizeof(Dre));	ctlr->tdrh = ctlr->tdri = 0;}static voidtransmit(Ether* ether){	Ctlr *ctlr;	Block *bp;	Dre *dre;	RingBuf *tb;	ctlr = ether->ctlr;	if(ctlr->init)		return;	while(ctlr->ntq < (Ntdre-1)){		tb = &ether->tb[ether->ti];		if(tb->owner != Interface)			break;		bp = allocb(tb->len);		memmove(bp->wp, tb->pkt, tb->len);		memmove(bp->wp+Eaddrlen, ether->ea, Eaddrlen);		bp->wp += tb->len;		/*		 * Give ownership of the descriptor to the chip,		 * increment the software ring descriptor pointer		 * and tell the chip to poll.		 * There's no need to pad to ETHERMINTU		 * here as ApadXmt is set in CSR4.		 */		dre = &ctlr->tdr[ctlr->tdrh];		dre->data = bp;		dre->addr = PADDR(bp->rp);		dre->md2 = 0;		dre->md1 = Own|Stp|Enp|Oflo|(-BLEN(bp) & 0xFFFF);		ctlr->ntq++;		ctlr->iow(ctlr, Rap, 0);		ctlr->iow(ctlr, Rdp, Iena|Tdmd);		ctlr->tdrh = NEXT(ctlr->tdrh, Ntdre);		tb->owner = Host;		ether->ti = NEXT(ether->ti, ether->ntb);	}}static voidinterrupt(Ureg*, void* arg){	Ctlr *ctlr;	Ether *ether;	int csr0;	Dre *dre;	RingBuf *rb;	ether = arg;	ctlr = ether->ctlr;	/*	 * Acknowledge all interrupts and whine about those that shouldn't	 * happen.	 */intrloop:	csr0 = ctlr->ior(ctlr, Rdp) & 0xFFFF;	ctlr->iow(ctlr, Rdp, Babl|Cerr|Miss|Merr|Rint|Tint|Iena);	if(csr0 & Merr)		ctlr->merr++;	if(csr0 & Miss)		ctlr->miss++;	if(csr0 & Babl)		ctlr->babl++;	//if(csr0 & (Babl|Miss|Merr))	//	print("#l%d: csr0 = 0x%uX\n", ether->ctlrno, csr0);	if(!(csr0 & (Rint|Tint)))		return;	/*	 * Receiver interrupt: run round the descriptor ring logging	 * errors and passing valid receive data up to the higher levels	 * until a descriptor is encountered still owned by the chip.	 */	if(csr0 & Rint){		dre = &ctlr->rdr[ctlr->rdrx];		while(!(dre->md1 & Own)){			rb = &ether->rb[ether->ri];			if(dre->md1 & RxErr){				if(dre->md1 & RxBuff)					ctlr->rxbuff++;				if(dre->md1 & Crc)					ctlr->crc++;				if(dre->md1 & Oflo)					ctlr->oflo++;				if(dre->md1 & Fram)					ctlr->fram++;			}			else if(rb->owner == Interface){				rb->owner = Host;				rb->len = (dre->md2 & 0x0FFF)-4;				memmove(rb->pkt, dre->data, rb->len);				ether->ri = NEXT(ether->ri, ether->nrb);			}			/*			 * Finished with this descriptor, reinitialise it,			 * give it back to the chip, then on to the next...			 */			dre->md2 = 0;			dre->md1 = Own|(-Rbsize & 0xFFFF);			ctlr->rdrx = NEXT(ctlr->rdrx, Nrdre);			dre = &ctlr->rdr[ctlr->rdrx];		}	}	/*	 * Transmitter interrupt: wakeup anyone waiting for a free descriptor.	 */	if(csr0 & Tint){		lock(ctlr);		while(ctlr->ntq){			dre = &ctlr->tdr[ctlr->tdri];			if(dre->md1 & Own)				break;				if(dre->md1 & TxErr){				if(dre->md2 & Rtry)					ctlr->rtry++;				if(dre->md2 & Lcar)					ctlr->lcar++;				if(dre->md2 & Lcol)					ctlr->lcol++;				if(dre->md2 & Uflo)					ctlr->uflo++;				if(dre->md2 & TxBuff)					ctlr->txbuff++;			}				freeb(dre->data);				ctlr->ntq--;			ctlr->tdri = NEXT(ctlr->tdri, Ntdre);		}		transmit(ether);		unlock(ctlr);	}	goto intrloop;}static voidamd79c970pci(void){	Ctlr *ctlr;	Pcidev *p;	p = nil;	while(p = pcimatch(p, 0x1022, 0x2000)){		ctlr = malloc(sizeof(Ctlr));		ctlr->port = p->mem[0].bar & ~0x01;		ctlr->pcidev = p;		if(ctlrhead != nil)			ctlrtail->next = ctlr;		else			ctlrhead = ctlr;		ctlrtail = ctlr;	}}intamd79c970reset(Ether* ether){	int x;	uchar ea[Eaddrlen];	Ctlr *ctlr;	if(ctlrhead == nil)		amd79c970pci();	/*	 * Any adapter matches if no 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;	/*	 * Allocate a controller structure and start to initialise it.	 */	ether->ctlr = ctlr;	ether->port = ctlr->port;	ether->irq = ctlr->pcidev->intl;	ether->tbdf = ctlr->pcidev->tbdf;	pcisetbme(ctlr->pcidev);	ilock(ctlr);	ctlr->init = 1;	io32r(ctlr, Sreset);	io16r(ctlr, Sreset);	if(io16w(ctlr, Rap, 0), io16r(ctlr, Rdp) == 4){		ctlr->ior = io16r;		ctlr->iow = io16w;	}else if(io32w(ctlr, Rap, 0), io32r(ctlr, Rdp) == 4){		ctlr->ior = io32r;		ctlr->iow = io32w;	}else{		print("#l%d: card doesn't talk right\n", ether->ctlrno);		iunlock(ctlr);		return -1;	}	ctlr->iow(ctlr, Rap, 88);	x = ctlr->ior(ctlr, Rdp);	ctlr->iow(ctlr, Rap, 89);	x |= ctlr->ior(ctlr, Rdp)<<16;	switch(x&0xFFFFFFF){	case 0x2420003:	/* PCnet/PCI 79C970 */	case 0x2621003:	/* PCnet/PCI II 79C970A */		break;	default:		print("unknown PCnet card version %.7ux\n", x&0xFFFFFFF);		iunlock(ctlr);		return -1;	}	/*	 * Set the software style in BCR20 to be PCnet-PCI to ensure 32-bit access.	 * Set the auto pad transmit in CSR4.	 */	ctlr->iow(ctlr, Rap, 20);	ctlr->iow(ctlr, Bdp, 0x0002);	ctlr->iow(ctlr, Rap, 4);	x = ctlr->ior(ctlr, Rdp) & 0xFFFF;	ctlr->iow(ctlr, Rdp, ApadXmt|x);	ctlr->iow(ctlr, Rap, 0);	/*	 * Check if the adapter's station address is to be overridden.	 * If not, read it from the I/O-space and set in ether->ea prior to	 * loading the station address in the initialisation block.	 */	memset(ea, 0, Eaddrlen);	if(!memcmp(ea, ether->ea, Eaddrlen)){		x = ctlr->ior(ctlr, Aprom);		ether->ea[0] = x;		ether->ea[1] = x>>8;		if(ctlr->ior == io16r)			x = ctlr->ior(ctlr, Aprom+2);		else			x >>= 16;		ether->ea[2] = x;		ether->ea[3] = x>>8;		x = ctlr->ior(ctlr, Aprom+4);		ether->ea[4] = x;		ether->ea[5] = x>>8;	}	/*	 * Start to fill in the initialisation block	 * (must be DWORD aligned).	 */	ctlr->iblock.rlen = Lognrdre<<4;	ctlr->iblock.tlen = Logntdre<<4;	memmove(ctlr->iblock.padr, ether->ea, sizeof(ctlr->iblock.padr));	ringinit(ctlr);	ctlr->iblock.rdra = PADDR(ctlr->rdr);	ctlr->iblock.tdra = PADDR(ctlr->tdr);	/*	 * Point the chip at the initialisation block and tell it to go.	 * Mask the Idon interrupt and poll for completion. Strt and interrupt	 * enables will be set later when attaching to the network.	 */	x = PADDR(&ctlr->iblock);	ctlr->iow(ctlr, Rap, 1);	ctlr->iow(ctlr, Rdp, x & 0xFFFF);	ctlr->iow(ctlr, Rap, 2);	ctlr->iow(ctlr, Rdp, (x>>16) & 0xFFFF);	ctlr->iow(ctlr, Rap, 3);	ctlr->iow(ctlr, Rdp, Idon);	ctlr->iow(ctlr, Rap, 0);	ctlr->iow(ctlr, Rdp, Init);	while(!(ctlr->ior(ctlr, Rdp) & Idon))		;	/*	 * We used to set CSR0 to Idon|Stop here, and then	 * in attach change it to Iena|Strt.  Apparently the simulated	 * 79C970 in VMware never enables after a write of Idon|Stop,	 * so we enable the device here now.	 */	ctlr->iow(ctlr, Rdp, Iena|Strt);	ctlr->init = 0;	iunlock(ctlr);	/*	 * Linkage to the generic ethernet driver.	 */	ether->attach = attach;	ether->transmit = transmit;	ether->interrupt = interrupt;	ether->detach = detach;	return 0;}