skgeinit.c

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 */
static void SkGeInitBmu(
SK_AC	*pAC,		/* adapter context */
SK_IOC	IoC,		/* IO context */
int		Port)		/* Port Index (MAC_1 + n) */
{
	SK_GEPORT	*pPrt;
	SK_U32		RxWm;
	SK_U32		TxWm;

	pPrt = &pAC->GIni.GP[Port];

	RxWm = SK_BMU_RX_WM;
	TxWm = SK_BMU_TX_WM;

	if (!pAC->GIni.GIPciSlot64 && !pAC->GIni.GIPciClock66) {
		/* for better performance */
		RxWm /= 2;
		TxWm /= 2;
	}

	/* Rx Queue: Release all local resets and set the watermark */
	SK_OUT32(IoC, Q_ADDR(pPrt->PRxQOff, Q_CSR), CSR_CLR_RESET);
	SK_OUT32(IoC, Q_ADDR(pPrt->PRxQOff, Q_F), RxWm);

	/*
	 * Tx Queue: Release all local resets if the queue is used !
	 * 		set watermark
	 */
	if (pPrt->PXSQSize != 0) {
		SK_OUT32(IoC, Q_ADDR(pPrt->PXsQOff, Q_CSR), CSR_CLR_RESET);
		SK_OUT32(IoC, Q_ADDR(pPrt->PXsQOff, Q_F), TxWm);
	}

	if (pPrt->PXAQSize != 0) {
		SK_OUT32(IoC, Q_ADDR(pPrt->PXaQOff, Q_CSR), CSR_CLR_RESET);
		SK_OUT32(IoC, Q_ADDR(pPrt->PXaQOff, Q_F), TxWm);
	}
	/*
	 * Do NOT enable the descriptor poll timers here, because
	 * the descriptor addresses are not specified yet.
	 */
}	/* SkGeInitBmu */


/******************************************************************************
 *
 *	TestStopBit() -	Test the stop bit of the queue
 *
 * Description:
 *	Stopping a queue is not as simple as it seems to be.
 *	If descriptor polling is enabled, it may happen
 *	that RX/TX stop is done and SV idle is NOT set.
 *	In this case we have to issue another stop command.
 *
 * Returns:
 *	The queues control status register
 */
static SK_U32 TestStopBit(
SK_AC	*pAC,		/* Adapter Context */
SK_IOC	IoC,		/* IO Context */
int		QuIoOffs)	/* Queue IO Address Offset */
{
	SK_U32	QuCsr;	/* CSR contents */

	SK_IN32(IoC, Q_ADDR(QuIoOffs, Q_CSR), &QuCsr);

	if ((QuCsr & (CSR_STOP | CSR_SV_IDLE)) == 0) {
		/* Stop Descriptor overridden by start command */
		SK_OUT32(IoC, Q_ADDR(QuIoOffs, Q_CSR), CSR_STOP);

		SK_IN32(IoC, Q_ADDR(QuIoOffs, Q_CSR), &QuCsr);
	}

	return(QuCsr);
}	/* TestStopBit */


/******************************************************************************
 *
 *	SkGeStopPort() - Stop the Rx/Tx activity of the port 'Port'.
 *
 * Description:
 *	After calling this function the descriptor rings and Rx and Tx
 *	queues of this port may be reconfigured.
 *
 *	It is possible to stop the receive and transmit path separate or
 *	both together.
 *
 *	Dir =	SK_STOP_TX 	Stops the transmit path only and resets the MAC.
 *				The receive queue is still active and
 *				the pending Rx frames may be still transferred
 *				into the RxD.
 *		SK_STOP_RX	Stop the receive path. The tansmit path
 *				has to be stopped once before.
 *		SK_STOP_ALL	SK_STOP_TX + SK_STOP_RX
 *
 *	RstMode = SK_SOFT_RST	Resets the MAC. The PHY is still alive.
 *			SK_HARD_RST	Resets the MAC and the PHY.
 *
 * Example:
 *	1) A Link Down event was signaled for a port. Therefore the activity
 *	of this port should be stopped and a hardware reset should be issued
 *	to enable the workaround of XMAC errata #2. But the received frames
 *	should not be discarded.
 *		...
 *		SkGeStopPort(pAC, IoC, Port, SK_STOP_TX, SK_HARD_RST);
 *		(transfer all pending Rx frames)
 *		SkGeStopPort(pAC, IoC, Port, SK_STOP_RX, SK_HARD_RST);
 *		...
 *
 *	2) An event was issued which request the driver to switch
 *	the 'virtual active' link to an other already active port
 *	as soon as possible. The frames in the receive queue of this
 *	port may be lost. But the PHY must not be reset during this
 *	event.
 *		...
 *		SkGeStopPort(pAC, IoC, Port, SK_STOP_ALL, SK_SOFT_RST);
 *		...
 *
 * Extended Description:
 *	If SK_STOP_TX is set,
 *		o disable the MAC's receive and transmitter to prevent
 *		  from sending incomplete frames
 *		o stop the port's transmit queues before terminating the
 *		  BMUs to prevent from performing incomplete PCI cycles
 *		  on the PCI bus
 *		- The network Rx and Tx activity and PCI Tx transfer is
 *		  disabled now.
 *		o reset the MAC depending on the RstMode
 *		o Stop Interval Timer and Limit Counter of Tx Arbiter,
 *		  also disable Force Sync bit and Enable Alloc bit.
 *		o perform a local reset of the port's Tx path
 *			- reset the PCI FIFO of the async Tx queue
 *			- reset the PCI FIFO of the sync Tx queue
 *			- reset the RAM Buffer async Tx queue
 *			- reset the RAM Buffer sync Tx queue
 *			- reset the MAC Tx FIFO
 *		o switch Link and Tx LED off, stop the LED counters
 *
 *	If SK_STOP_RX is set,
 *		o stop the port's receive queue
 *		- The path data transfer activity is fully stopped now.
 *		o perform a local reset of the port's Rx path
 *			- reset the PCI FIFO of the Rx queue
 *			- reset the RAM Buffer receive queue
 *			- reset the MAC Rx FIFO
 *		o switch Rx LED off, stop the LED counter
 *
 *	If all ports are stopped,
 *		o reset the RAM Interface.
 *
 * Notes:
 *	o This function may be called during the driver states RESET_PORT and
 *	  SWITCH_PORT.
 */
void SkGeStopPort(
SK_AC	*pAC,	/* adapter context */
SK_IOC	IoC,	/* I/O context */
int		Port,	/* port to stop (MAC_1 + n) */
int		Dir,	/* Direction to Stop (SK_STOP_RX, SK_STOP_TX, SK_STOP_ALL) */
int		RstMode)/* Reset Mode (SK_SOFT_RST, SK_HARD_RST) */
{
#ifndef SK_DIAG
	SK_EVPARA Para;
#endif /* !SK_DIAG */
	SK_GEPORT *pPrt;
	SK_U32	DWord;
	SK_U32	XsCsr;
	SK_U32	XaCsr;
	SK_U64	ToutStart;
	int		i;
	int		ToutCnt;

	pPrt = &pAC->GIni.GP[Port];

	if ((Dir & SK_STOP_TX) != 0) {
		/* disable receiver and transmitter */
		SkMacRxTxDisable(pAC, IoC, Port);

		/* stop both transmit queues */
		/*
		 * If the BMU is in the reset state CSR_STOP will terminate
		 * immediately.
		 */
		SK_OUT32(IoC, Q_ADDR(pPrt->PXsQOff, Q_CSR), CSR_STOP);
		SK_OUT32(IoC, Q_ADDR(pPrt->PXaQOff, Q_CSR), CSR_STOP);

		ToutStart = SkOsGetTime(pAC);
		ToutCnt = 0;
		do {
			/*
			 * Clear packet arbiter timeout to make sure
			 * this loop will terminate.
			 */
			SK_OUT16(IoC, B3_PA_CTRL, (Port == MAC_1) ? PA_CLR_TO_TX1 :
				PA_CLR_TO_TX2);

			/*
			 * If the transfer stucks at the MAC the STOP command will not
			 * terminate if we don't flush the XMAC's transmit FIFO !
			 */
			SkMacFlushTxFifo(pAC, IoC, Port);

			XsCsr = TestStopBit(pAC, IoC, pPrt->PXsQOff);
			XaCsr = TestStopBit(pAC, IoC, pPrt->PXaQOff);

			if (SkOsGetTime(pAC) - ToutStart > (SK_TICKS_PER_SEC / 18)) {
				/*
				 * Timeout of 1/18 second reached.
				 * This needs to be checked at 1/18 sec only.
				 */
				ToutCnt++;
				if (ToutCnt > 1) {
					/* Might be a problem when the driver event handler
					 * calls StopPort again. XXX.
					 */

					/* Fatal Error, Loop aborted */
					SK_ERR_LOG(pAC, SK_ERRCL_HW, SKERR_HWI_E018,
						SKERR_HWI_E018MSG);
#ifndef SK_DIAG
					Para.Para64 = Port;
					SkEventQueue(pAC, SKGE_DRV, SK_DRV_PORT_FAIL, Para);
#endif /* !SK_DIAG */
					return;
				}
				/*
				 * Cache incoherency workaround: Assume a start command
				 * has been lost while sending the frame.
				 */
				ToutStart = SkOsGetTime(pAC);

				if ((XsCsr & CSR_STOP) != 0) {
					SK_OUT32(IoC, Q_ADDR(pPrt->PXsQOff, Q_CSR), CSR_START);
				}
				if ((XaCsr & CSR_STOP) != 0) {
					SK_OUT32(IoC, Q_ADDR(pPrt->PXaQOff, Q_CSR), CSR_START);
				}
			}

			/*
			 * Because of the ASIC problem report entry from 21.08.1998 it is
			 * required to wait until CSR_STOP is reset and CSR_SV_IDLE is set.
			 */
		} while ((XsCsr & (CSR_STOP | CSR_SV_IDLE)) != CSR_SV_IDLE ||
				 (XaCsr & (CSR_STOP | CSR_SV_IDLE)) != CSR_SV_IDLE);

		/* Reset the MAC depending on the RstMode */
		if (RstMode == SK_SOFT_RST) {
			SkMacSoftRst(pAC, IoC, Port);
		}
		else {
			SkMacHardRst(pAC, IoC, Port);
		}

		/* Disable Force Sync bit and Enable Alloc bit */
		SK_OUT8(IoC, MR_ADDR(Port, TXA_CTRL),
			TXA_DIS_FSYNC | TXA_DIS_ALLOC | TXA_STOP_RC);

		/* Stop Interval Timer and Limit Counter of Tx Arbiter */
		SK_OUT32(IoC, MR_ADDR(Port, TXA_ITI_INI), 0L);
		SK_OUT32(IoC, MR_ADDR(Port, TXA_LIM_INI), 0L);

		/* Perform a local reset of the port's Tx path */

		/* Reset the PCI FIFO of the async Tx queue */
		SK_OUT32(IoC, Q_ADDR(pPrt->PXaQOff, Q_CSR), CSR_SET_RESET);
		/* Reset the PCI FIFO of the sync Tx queue */
		SK_OUT32(IoC, Q_ADDR(pPrt->PXsQOff, Q_CSR), CSR_SET_RESET);
		/* Reset the RAM Buffer async Tx queue */
		SK_OUT8(IoC, RB_ADDR(pPrt->PXaQOff, RB_CTRL), RB_RST_SET);
		/* Reset the RAM Buffer sync Tx queue */
		SK_OUT8(IoC, RB_ADDR(pPrt->PXsQOff, RB_CTRL), RB_RST_SET);

		/* Reset Tx MAC FIFO */
		if (pAC->GIni.GIGenesis) {
			/* Note: MFF_RST_SET does NOT reset the XMAC ! */
			SK_OUT8(IoC, MR_ADDR(Port, TX_MFF_CTRL2), MFF_RST_SET);

			/* switch Link and Tx LED off, stop the LED counters */
			/* Link LED is switched off by the RLMT and the Diag itself */
			SkGeXmitLED(pAC, IoC, MR_ADDR(Port, TX_LED_INI), SK_LED_DIS);
		}
		else {
			/* Reset TX MAC FIFO */
			SK_OUT8(IoC, MR_ADDR(Port, TX_GMF_CTRL_T), (SK_U8)GMF_RST_SET);
		}
	}

	if ((Dir & SK_STOP_RX) != 0) {
		/*
		 * The RX Stop Command will not terminate if no buffers
		 * are queued in the RxD ring. But it will always reach
		 * the Idle state. Therefore we can use this feature to
		 * stop the transfer of received packets.
		 */
		/* stop the port's receive queue */
		SK_OUT32(IoC, Q_ADDR(pPrt->PRxQOff, Q_CSR), CSR_STOP);

		i = 100;
		do {
			/*
			 * Clear packet arbiter timeout to make sure
			 * this loop will terminate
			 */
			SK_OUT16(IoC, B3_PA_CTRL, (Port == MAC_1) ? PA_CLR_TO_RX1 :
				PA_CLR_TO_RX2);

			DWord = TestStopBit(pAC, IoC, pPrt->PRxQOff);

			/* timeout if i==0 (bug fix for #10748) */
			if (--i == 0) {
				SK_ERR_LOG(pAC, SK_ERRCL_HW, SKERR_HWI_E024,
					SKERR_HWI_E024MSG);
				break;
			}
			/*
			 * because of the ASIC problem report entry from 21.08.98
			 * it is required to wait until CSR_STOP is reset and
			 * CSR_SV_IDLE is set.
			 */
		} while ((DWord & (CSR_STOP | CSR_SV_IDLE)) != CSR_SV_IDLE);

		/* The path data transfer activity is fully stopped now */

		/* Perform a local reset of the port's Rx path */

		 /*	Reset the PCI FIFO of the Rx queue */
		SK_OUT32(IoC, Q_ADDR(pPrt->PRxQOff, Q_CSR), CSR_SET_RESET);
		/* Reset the RAM Buffer receive queue */
		SK_OUT8(IoC, RB_ADDR(pPrt->PRxQOff, RB_CTRL), RB_RST_SET);

		/* Reset Rx MAC FIFO */
		if (pAC->GIni.GIGenesis) {

			SK_OUT8(IoC, MR_ADDR(Port, RX_MFF_CTRL2), MFF_RST_SET);

			/* switch Rx LED off, stop the LED counter */
			SkGeXmitLED(pAC, IoC, MR_ADDR(Port, RX_LED_INI), SK_LED_DIS);
		}
		else {
			/* Reset Rx MAC FIFO */
			SK_OUT8(IoC, MR_ADDR(Port, RX_GMF_CTRL_T), (SK_U8)GMF_RST_SET);
		}
	}
}	/* SkGeStopPort */


/******************************************************************************
 *
 *	SkGeInit0() - Level 0 Initialization
 *
 * Description:
 *	- Initialize the BMU address offsets
 *
 * Returns:
 *	nothing
 */
static void SkGeInit0(
SK_AC	*pAC,		/* adapter context */
SK_IOC	IoC)		/* IO context */
{
	int i;
	SK_GEPORT *pPrt;

	for (i = 0; i < SK_MAX_MACS; i++) {
		pPrt = &pAC->GIni.GP[i];

		pPrt->PState = SK_PRT_RESET;
		pPrt->PRxQOff = QOffTab[i].RxQOff;
		pPrt->PXsQOff = QOffTab[i].XsQOff;
		pPrt->PXaQOff = QOffTab[i].XaQOff;
		pPrt->PCheckPar = SK_FALSE;
		pPrt->PIsave = 0;
		pPrt->PPrevShorts = 0;
		pPrt->PLinkResCt = 0;
		pPrt->PAutoNegTOCt = 0;
		pPrt->PPrevRx = 0;
		pPrt->PPrevFcs = 0;
		pPrt->PRxLim = SK_DEF_RX_WA_LIM;
		pPrt->PLinkMode = SK_LMODE_AUTOFULL;
		pPrt->PLinkSpeedCap = SK_LSPEED_CAP_1000MBPS;
		pPrt->PLinkSpeed = SK_LSPEED_1000MBPS;
		pPrt->PLinkSpeedUsed = SK_LSPEED_STAT_UNKNOWN;
		pPrt->PLinkModeConf = SK_LMODE_AUTOSENSE;
		pPrt->PFlowCtrlMode = SK_FLOW_MODE_SYM_OR_REM;
		pPrt->PLinkBroken = SK_TRUE; /* See WA code */
		pPrt->PLinkCap = (SK_LMODE_CAP_HALF | SK_LMODE_CAP_FULL |
				SK_LMODE_CAP_AUTOHALF | SK_LMODE_CAP_AUTOFULL);
		pPrt->PLinkModeStatus = SK_LMODE_STAT_UNKNOWN;
		pPrt->PFlowCtrlCap = SK_FLOW_MODE_SYM_OR_REM;
		pPrt->PFlowCtrlStatus = SK_FLOW_STAT_NONE;
		pPrt->PMSCap = 0;
		pPrt->PMSMode = SK_MS_MODE_AUTO;
		pPrt->PMSStatus = SK_MS_STAT_UNSET;
		pPrt->PAutoNegFail = SK_FALSE;
		pPrt->PLipaAutoNeg = SK_LIPA_UNKNOWN;
		pPrt->PHWLinkUp = SK_FALSE;
	}

	pAC->GIni.GIPortUsage = SK_RED_LINK;

}	/* SkGeInit0*/

#ifdef SK_PCI_RESET

/******************************************************************************
 *
 *	SkGePciReset() - Reset PCI interface
 *
 * Description:
 *	o Read PCI configuration.
 *	o Change power state to 3.
 *	o Change power state to 0.
 *	o Restore PCI configuration.
 *
 * Returns:
 *	0:	Success.
 *	1:	Power state could not be changed to 3.
 */
static int SkGePciReset(
SK_AC	*pAC,		/* adapter context */
SK_IOC	IoC)		/* IO context */
{
	int		i;
	SK_U16	PmCtlSts;
	SK_U32	Bp1;
	SK_U32	Bp2;
	SK_U16	PciCmd;
	SK_U8	Cls;
	SK_U8	Lat;
	SK_U8	ConfigSpace[PCI_CFG_SIZE];

	/*
	 * Note: Switching to D3 state is like a software reset.
	 *		 Switching from D3 to D0 is a hardware reset.
	 *		 We have to save and restore the configuration space.
	 */
	for (i = 0; i < PCI_CFG_SIZE; i++) {
		SkPciReadCfgDWord(pAC, i*4, &ConfigSpace[i]);
	}

	/* We know the RAM Interface Arbiter is enabled. */