etherelnk3.c

著名操作系统Plan 9的第三版的部分核心源代码。现在很难找到了。Plan 9是bell实验室开发的Unix后继者。

/*
 * Etherlink III and Fast EtherLink adapters.
 * To do:
 *	autoSelect;
 *	busmaster channel;
 *	PCMCIA;
 *	PCI latency timer and master enable;
 *	errata list.
 *
 * Product ID:
 *	9150 ISA	3C509[B]
 *	9050 ISA	3C509[B]-TP
 *	9450 ISA	3C509[B]-COMBO
 *	9550 ISA	3C509[B]-TPO
 *
 *	9350 EISA	3C579
 *	9250 EISA	3C579-TP
 *
 *	5920 EISA	3C592-[TP|COMBO|TPO]
 *	5970 EISA	3C597-TX	Fast Etherlink 10BASE-T/100BASE-TX
 *	5971 EISA	3C597-T4	Fast Etherlink 10BASE-T/100BASE-T4
 *	5972 EISA	3C597-MII	Fast Etherlink 10BASE-T/MII
 *
 *	5900 PCI	3C590-[TP|COMBO|TPO]
 *	5950 PCI	3C595-TX	Fast Etherlink Shared 10BASE-T/100BASE-TX
 *	5951 PCI	3C595-T4	Fast Etherlink Shared 10BASE-T/100BASE-T4
 *	5952 PCI	3C595-MII	Fast Etherlink 10BASE-T/MII
 *
 *	9058 PCMCIA	3C589[B]-[TP|COMBO]
 *
 *	627C MCA	3C529
 *	627D MCA	3C529-TP
 */
#include "u.h"
#include "lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"

#include "etherif.h"

enum {
	IDport			= 0x0110,	/* anywhere between 0x0100 and 0x01F0 */
};

enum {						/* all windows */
	CommandR		= 0x000E,
	IntStatus		= 0x000E,
};

enum {						/* Commands */
	GlobalReset		= 0x0000,
	SelectRegisterWindow	= 0x0001,
	EnableDcConverter	= 0x0002,
	RxDisable		= 0x0003,
	RxEnable		= 0x0004,
	RxReset			= 0x0005,
	Stall			= 0x0006,	/* 3C90x */
	TxDone			= 0x0007,
	RxDiscard		= 0x0008,
	TxEnable		= 0x0009,
	TxDisable		= 0x000A,
	TxReset			= 0x000B,
	RequestInterrupt	= 0x000C,
	AcknowledgeInterrupt	= 0x000D,
	SetInterruptEnable	= 0x000E,
	SetIndicationEnable	= 0x000F,	/* SetReadZeroMask */
	SetRxFilter		= 0x0010,
	SetRxEarlyThresh	= 0x0011,
	SetTxAvailableThresh	= 0x0012,
	SetTxStartThresh	= 0x0013,
	StartDma		= 0x0014,	/* initiate busmaster operation */
	StatisticsEnable	= 0x0015,
	StatisticsDisable	= 0x0016,
	DisableDcConverter	= 0x0017,
	SetTxReclaimThresh	= 0x0018,	/* PIO-only adapters */
	PowerUp			= 0x001B,	/* not all adapters */
	PowerDownFull		= 0x001C,	/* not all adapters */
	PowerAuto		= 0x001D,	/* not all adapters */
};

enum {						/* (Global|Rx|Tx)Reset command bits */
	tpAuiReset		= 0x0001,	/* 10BaseT and AUI transceivers */
	endecReset		= 0x0002,	/* internal Ethernet encoder/decoder */
	networkReset		= 0x0004,	/* network interface logic */
	fifoReset		= 0x0008,	/* FIFO control logic */
	aismReset		= 0x0010,	/* autoinitialise state-machine logic */
	hostReset		= 0x0020,	/* bus interface logic */
	dmaReset		= 0x0040,	/* bus master logic */
	vcoReset		= 0x0080,	/* on-board 10Mbps VCO */
	updnReset		= 0x0100,	/* upload/download (Rx/TX) logic */

	resetMask		= 0x01FF,
};

enum {						/* Stall command bits */
	upStall			= 0x0000,
	upUnStall		= 0x0001,
	dnStall			= 0x0002,
	dnUnStall		= 0x0003,
};

enum {						/* SetRxFilter command bits */
	receiveIndividual	= 0x0001,	/* match station address */
	receiveMulticast	= 0x0002,
	receiveBroadcast	= 0x0004,
	receiveAllFrames	= 0x0008,	/* promiscuous */
};

enum {						/* StartDma command bits */
	Upload			= 0x0000,	/* transfer data from adapter to memory */
	Download		= 0x0001,	/* transfer data from memory to adapter */
};

enum {						/* IntStatus bits */
	interruptLatch		= 0x0001,
	hostError		= 0x0002,	/* Adapter Failure */
	txComplete		= 0x0004,
	txAvailable		= 0x0008,
	rxComplete		= 0x0010,
	rxEarly			= 0x0020,
	intRequested		= 0x0040,
	updateStats		= 0x0080,
	transferInt		= 0x0100,	/* Bus Master Transfer Complete */
	dnComplete		= 0x0200,
	upComplete		= 0x0400,
	busMasterInProgress	= 0x0800,
	commandInProgress	= 0x1000,

	interruptMask		= 0x07FE,
};

#define COMMAND(port, cmd, a)	outs((port)+CommandR, ((cmd)<<11)|(a))
#define STATUS(port)		ins((port)+IntStatus)

enum {						/* Window 0 - setup */
	Wsetup			= 0x0000,
						/* registers */
	ManufacturerID		= 0x0000,	/* 3C5[08]*, 3C59[27] */
	ProductID		= 0x0002,	/* 3C5[08]*, 3C59[27] */
	ConfigControl		= 0x0004,	/* 3C5[08]*, 3C59[27] */
	AddressConfig		= 0x0006,	/* 3C5[08]*, 3C59[27] */
	ResourceConfig		= 0x0008,	/* 3C5[08]*, 3C59[27] */
	EepromCommand		= 0x000A,
	EepromData		= 0x000C,
						/* AddressConfig Bits */
	autoSelect9		= 0x0080,
	xcvrMask9		= 0xC000,
						/* ConfigControl bits */
	Ena			= 0x0001,
	base10TAvailable9	= 0x0200,
	coaxAvailable9		= 0x1000,
	auiAvailable9		= 0x2000,
						/* EepromCommand bits */
	EepromReadRegister	= 0x0080,
	EepromBusy		= 0x8000,
};

#define EEPROMCMD(port, cmd, a)	outs((port)+EepromCommand, (cmd)|(a))
#define EEPROMBUSY(port)	(ins((port)+EepromCommand) & EepromBusy)
#define EEPROMDATA(port)	ins((port)+EepromData)

enum {						/* Window 1 - operating set */
	Wop			= 0x0001,
						/* registers */
	Fifo			= 0x0000,
	RxError			= 0x0004,	/* 3C59[0257] only */
	RxStatus		= 0x0008,
	Timer			= 0x000A,
	TxStatus		= 0x000B,
	TxFree			= 0x000C,
						/* RxError bits */
	rxOverrun		= 0x0001,
	runtFrame		= 0x0002,
	alignmentError		= 0x0004,	/* Framing */
	crcError		= 0x0008,
	oversizedFrame		= 0x0010,
	dribbleBits		= 0x0080,
						/* RxStatus bits */
	rxBytes			= 0x1FFF,	/* 3C59[0257] mask */
	rxBytes9		= 0x07FF,	/* 3C5[078]9 mask */
	rxError9		= 0x3800,	/* 3C5[078]9 error mask */
	rxOverrun9		= 0x0000,
	oversizedFrame9		= 0x0800,
	dribbleBits9		= 0x1000,
	runtFrame9		= 0x1800,
	alignmentError9		= 0x2000,	/* Framing */
	crcError9		= 0x2800,
	rxError			= 0x4000,
	rxIncomplete		= 0x8000,
						/* TxStatus Bits */
	txStatusOverflow	= 0x0004,
	maxCollisions		= 0x0008,
	txUnderrun		= 0x0010,
	txJabber		= 0x0020,
	interruptRequested	= 0x0040,
	txStatusComplete	= 0x0080,
};

enum {						/* Window 2 - station address */
	Wstation		= 0x0002,
};

enum {						/* Window 3 - FIFO management */
	Wfifo			= 0x0003,
						/* registers */
	InternalConfig		= 0x0000,	/* 3C509B, 3C589, 3C59[0257] */
	OtherInt		= 0x0004,	/* 3C59[0257] */
	RomControl		= 0x0006,	/* 3C509B, 3C59[27] */
	MacControl		= 0x0006,	/* 3C59[0257] */
	ResetOptions		= 0x0008,	/* 3C59[0257] */
	RxFree			= 0x000A,
						/* InternalConfig bits */
	disableBadSsdDetect	= 0x00000100,
	ramLocation		= 0x00000200,	/* 0 external, 1 internal */
	ramPartition5to3	= 0x00000000,
	ramPartition3to1	= 0x00010000,
	ramPartition1to1	= 0x00020000,
	ramPartition3to5	= 0x00030000,
	ramPartitionMask	= 0x00030000,
	xcvr10BaseT		= 0x00000000,
	xcvrAui			= 0x00100000,	/* 10BASE5 */
	xcvr10Base2		= 0x00300000,
	xcvr100BaseTX		= 0x00400000,
	xcvr100BaseFX		= 0x00500000,
	xcvrMii			= 0x00600000,
	xcvrMask		= 0x00700000,
	autoSelect		= 0x01000000,
						/* MacControl bits */
	deferExtendEnable	= 0x0001,
	deferTimerSelect	= 0x001E,	/* mask */
	fullDuplexEnable	= 0x0020,
	allowLargePackets	= 0x0040,
						/* ResetOptions bits */
	baseT4Available		= 0x0001,
	baseTXAvailable		= 0x0002,
	baseFXAvailable		= 0x0004,
	base10TAvailable	= 0x0008,
	coaxAvailable		= 0x0010,
	auiAvailable		= 0x0020,
	miiConnector		= 0x0040,
};

enum {						/* Window 4 - diagnostic */
	Wdiagnostic		= 0x0004,
						/* registers */
	VcoDiagnostic		= 0x0002,
	FifoDiagnostic		= 0x0004,
	NetworkDiagnostic	= 0x0006,
	PhysicalMgmt		= 0x0008,
	MediaStatus		= 0x000A,
	BadSSD			= 0x000C,
						/* FifoDiagnostic bits */
	txOverrun		= 0x0400,
	rxUnderrun		= 0x2000,
	receiving		= 0x8000,
						/* PhysicalMgmt bits */
	mgmtClk			= 0x0001,
	mgmtData		= 0x0002,
	mgmtDir			= 0x0004,
	cat5LinkTestDefeat	= 0x8000,
						/* MediaStatus bits */
	dataRate100		= 0x0002,
	crcStripDisable		= 0x0004,
	enableSqeStats		= 0x0008,
	collisionDetect		= 0x0010,
	carrierSense		= 0x0020,
	jabberGuardEnable	= 0x0040,
	linkBeatEnable		= 0x0080,
	jabberDetect		= 0x0200,
	polarityReversed	= 0x0400,
	linkBeatDetect		= 0x0800,
	txInProg		= 0x1000,
	dcConverterEnabled	= 0x4000,
	auiDisable		= 0x8000,
};

enum {						/* Window 5 - internal state */
	Wstate			= 0x0005,
						/* registers */
	TxStartThresh		= 0x0000,
	TxAvalableThresh	= 0x0002,
	RxEarlyThresh		= 0x0006,
	RxFilter		= 0x0008,
	InterruptEnable		= 0x000A,
	IndicationEnable	= 0x000C,
};

enum {						/* Window 6 - statistics */
	Wstatistics		= 0x0006,
						/* registers */
	CarrierLost		= 0x0000,
	SqeErrors		= 0x0001,
	MultipleColls		= 0x0002,
	SingleCollFrames	= 0x0003,
	LateCollisions		= 0x0004,
	RxOverruns		= 0x0005,
	FramesXmittedOk		= 0x0006,
	FramesRcvdOk		= 0x0007,
	FramesDeferred		= 0x0008,
	UpperFramesOk		= 0x0009,
	BytesRcvdOk		= 0x000A,
	BytesXmittedOk		= 0x000C,
};

enum {						/* Window 7 - bus master operations */
	Wmaster			= 0x0007,
						/* registers */
	MasterAddress		= 0x0000,
	MasterLen		= 0x0006,
	MasterStatus		= 0x000C,
						/* MasterStatus bits */
	masterAbort		= 0x0001,
	targetAbort		= 0x0002,
	targetRetry		= 0x0004,
	targetDisc		= 0x0008,
	masterDownload		= 0x1000,
	masterUpload		= 0x4000,
	masterInProgress	= 0x8000,

	masterMask		= 0xD00F,
};	

enum {						/* 3C90x extended register set */
	PktStatus		= 0x0020,	/* 32-bits */
	DnListPtr		= 0x0024,	/* 32-bits, 8-byte aligned */
	FragAddr		= 0x0028,	/* 32-bits */
	FragLen			= 0x002C,	/* 16-bits */
	ListOffset		= 0x002E,	/* 8-bits */
	TxFreeThresh		= 0x002F,	/* 8-bits */
	UpPktStatus		= 0x0030,	/* 32-bits */
	FreeTimer		= 0x0034,	/* 16-bits */
	UpListPtr		= 0x0038,	/* 32-bits, 8-byte aligned */

						/* PktStatus bits */
	fragLast		= 0x00000001,
	dnCmplReq		= 0x00000002,
	dnStalled		= 0x00000004,
	upCompleteX		= 0x00000008,
	dnCompleteX		= 0x00000010,
	upRxEarlyEnable		= 0x00000020,
	armCountdown		= 0x00000040,
	dnInProg		= 0x00000080,
	counterSpeed		= 0x00000010,	/* 0 3.2uS, 1 320nS */
	countdownMode		= 0x00000020,
						/* UpPktStatus bits (dpd->control) */
	upPktLenMask		= 0x00001FFF,
	upStalled		= 0x00002000,
	upError			= 0x00004000,
	upPktComplete		= 0x00008000,
	upOverrun		= 0x00010000,	/* RxError<<16 */
	upRuntFrame		= 0x00020000,
	upAlignmentError	= 0x00040000,
	upCRCError		= 0x00080000,
	upOversizedFrame	= 0x00100000,
	upDribbleBits		= 0x00800000,
	upOverflow		= 0x01000000,

	dnIndicate		= 0x80000000,	/* FrameStartHeader (dpd->control) */

	updnLastFrag		= 0x80000000,	/* (dpd->len) */

	Nup			= 16,
	Ndn			= 4,
};

/*
 * Up/Dn Packet Descriptors.
 * The hardware info (np, control, addr, len) must be 8-byte aligned
 * and this structure size must be a multiple of 8.
 */
typedef struct Pd Pd;
typedef struct Pd {
	ulong	np;			/* next pointer */
	ulong	control;		/* FSH or UpPktStatus */
	ulong	addr;
	ulong	len;

	Pd*	next;
	void*	vaddr;
} Pd;

typedef struct {
	Lock	wlock;

	int	busmaster;

	int	txthreshold;

	int	nup;			/* full-busmaster -based reception */
	void*	upbase;
	Pd*	upr;
	Pd*	uphead;

	int	ndn;			/* full-busmaster -based transmission */
	void*	dnbase;
	Pd*	dnr;
	Pd*	dnhead;
	Pd*	dntail;
	int	dnq;

	int	xcvr;			/* transceiver type */
	int	rxstatus9;		/* old-style RxStatus register */
	int	rxearly;		/* RxEarlyThreshold */
	int	ts;			/* threshold shift */
} Ctlr;

static void
init905(Ctlr* ctlr)
{
	Pd *pd, *prev;
	uchar *vaddr;

	/*
	 * Create rings for the receive and transmit sides.
	 * Take care with alignment:
	 *	make sure ring base is 8-byte aligned;
	 *	make sure each entry is 8-byte aligned.
	 */
	ctlr->upr = ialloc(ctlr->nup*sizeof(Pd), 8);
	vaddr = ialloc(ctlr->nup*ROUNDUP(sizeof(Etherpkt)+4, 8), 8);

	prev = ctlr->upr;
	for(pd = &ctlr->upr[ctlr->nup-1]; pd >= ctlr->upr; pd--){
		pd->np = PADDR(&prev->np);
		pd->control = 0;
		pd->vaddr = vaddr;
		pd->addr = PADDR(vaddr);
		vaddr += ROUNDUP(sizeof(Etherpkt)+4, 8);
		pd->len = updnLastFrag|sizeof(Etherpkt);

		pd->next = prev;
		prev = pd;
	}
	ctlr->uphead = ctlr->upr;

	ctlr->dnr = ialloc(ctlr->ndn*sizeof(Pd), 8);

	prev = ctlr->dnr;
	for(pd = &ctlr->dnr[ctlr->ndn-1]; pd >= ctlr->dnr; pd--){
		pd->next = prev;
		prev = pd;
	}
	ctlr->dnhead = ctlr->dnr;
	ctlr->dntail = ctlr->dnr;
	ctlr->dnq = 0;
}

static void
attach(Ether* ether)
{
	Ctlr *ctlr;
	int port, x;

	ctlr = ether->ctlr;
	port = ether->port;

	/*
	 * Set the receiver packet filter for this and broadcast addresses,
	 * set the interrupt masks for all interrupts, enable the receiver
	 * and transmitter.
	 */
	x = receiveBroadcast|receiveIndividual;
	COMMAND(port, SetRxFilter, x);

	x = interruptMask;
	if(ctlr->busmaster == 2)
		x &= ~(transferInt|rxEarly|rxComplete);

	COMMAND(port, SetIndicationEnable, x);
	COMMAND(port, SetInterruptEnable, x);

	COMMAND(port, RxEnable, 0);
	COMMAND(port, TxEnable, 0);

	if(ctlr->busmaster == 2)
		outl(port+UpListPtr, PADDR(&ctlr->uphead->np));
}

static void
txstart(Ether* ether)
{
	int port, len;
	RingBuf *tb;

	/*
	 * Attempt to top-up the transmit FIFO. If there's room simply
	 * stuff in the packet length (unpadded to a dword boundary), the
	 * packet data (padded) and remove the packet from the queue.
	 * If there's no room post an interrupt for when there is.
	 * This routine is called both from the top level and from interrupt
	 * level.
	 */
	port = ether->port;
	for(tb = &ether->tb[ether->ti]; tb->owner == Interface; tb = &ether->tb[ether->ti]){
		if(debug) print("transmit...");
		len = ROUNDUP(tb->len, 4);
		if(len+4 <= ins(port+TxFree)){
			outl(port+Fifo, tb->len);
			if(debug) print("send...");
			outsl(port+Fifo, tb->pkt, len/4);
			tb->owner = Host;
			ether->ti = NEXT(ether->ti, ether->ntb);
		}
		else{
			if(debug) print("setthresh...");
			COMMAND(port, SetTxAvailableThresh, len);
			break;
		}
	}
}

static void
txstart905(Ether* ether)
{
	Ctlr *ctlr;
	int port, stalled, timeo;
	RingBuf *tb;
	Pd *pd;

	ctlr = ether->ctlr;
	port = ether->port;

	/*