20060303

1 files changed, 539 insertions, 0 deletions

diff --git a/os/boot/pc/ether79c970.c b/os/boot/pc/ether79c970.c
new file mode 100644
index 00000000..6a171b24
--- /dev/null
+++ b/os/boot/pc/ether79c970.c
@@ -0,0 +1,539 @@
+/*
+ * 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 int
+io16r(Ctlr* c, int r)
+{
+	if(r >= Rdp)
+		r = (r-Rdp)/2+Rdp;
+	return ins(c->port+r);
+}
+
+static void
+io16w(Ctlr* c, int r, int v)
+{
+	if(r >= Rdp)
+		r = (r-Rdp)/2+Rdp;
+	outs(c->port+r, v);
+}
+
+static int
+io32r(Ctlr* c, int r)
+{
+	return inl(c->port+r);
+}
+
+static void
+io32w(Ctlr* c, int r, int v)
+{
+	outl(c->port+r, v);
+}
+
+static void
+attach(Ether*)
+{
+}
+
+static void
+detach(Ether* ether)
+{
+	Ctlr *ctlr;
+
+	ctlr = ether->ctlr;
+	ctlr->iow(ctlr, Rdp, Iena|Stop);
+}
+
+static void
+ringinit(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 void
+transmit(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 void
+interrupt(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 void
+amd79c970pci(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;
+	}
+}
+
+int
+amd79c970reset(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;
+}