skgesirq.c

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/******************************************************************************
 *
 * Name:	skgesirq.c
 * Project:	GEnesis, PCI Gigabit Ethernet Adapter
 * Version:	$Revision: 1.55 $
 * Date:	$Date: 2000/06/19 08:36:25 $
 * Purpose:	Special IRQ module
 *
 ******************************************************************************/

/******************************************************************************
 *
 *	(C)Copyright 1998,1999 SysKonnect,
 *	a business unit of Schneider & Koch & Co. Datensysteme GmbH.
 *
 *	This program is free software; you can redistribute it and/or modify
 *	it under the terms of the GNU General Public License as published by
 *	the Free Software Foundation; either version 2 of the License, or
 *	(at your option) any later version.
 *
 *	The information in this file is provided "AS IS" without warranty.
 *
 ******************************************************************************/

/******************************************************************************
 *
 * History:
 *
 *	$Log: skgesirq.c,v $
 *	Revision 1.55  2000/06/19 08:36:25  cgoos
 *	Changed comment.
 *	
 *	Revision 1.54  2000/05/22 08:45:57  malthoff
 *	Fix: #10523 is valid for all BCom PHYs.
 *	
 *	Revision 1.53  2000/05/19 10:20:30  cgoos
 *	Removed Solaris debug output code.
 *	
 *	Revision 1.52  2000/05/19 10:19:37  cgoos
 *	Added PHY state check in HWLinkDown.
 *	Move PHY interrupt code to IS_EXT_REG case in SkGeSirqIsr.
 *	
 *	Revision 1.51  2000/05/18 05:56:20  cgoos
 *	Fixed typo.
 *	
 *	Revision 1.50  2000/05/17 12:49:49  malthoff
 *	Fixes BCom link bugs (#10523).
 *	
 *	Revision 1.49  1999/12/17 11:02:50  gklug
 *	fix: read PHY_STAT of Broadcom chip more often to assure good status
 *	
 *	Revision 1.48  1999/12/06 10:01:17  cgoos
 *	Added SET function for Role.
 *	
 *	Revision 1.47  1999/11/22 13:34:24  cgoos
 *	Changed license header to GPL.
 *	
 *	Revision 1.46  1999/09/16 10:30:07  cgoos
 *	Removed debugging output statement from Linux.
 *	
 *	Revision 1.45  1999/09/16 07:32:55  cgoos
 *	Fixed dual-port copperfield bug (PHY_READ from resetted port).
 *	Removed some unused variables.
 *	
 *	Revision 1.44  1999/08/03 15:25:04  cgoos
 *	Removed workaround for disabled interrupts in half duplex mode.
 *	
 *	Revision 1.43  1999/08/03 14:27:58  cgoos
 *	Removed SENSE mode code from SkGePortCheckUpBcom.
 *	
 *	Revision 1.42  1999/07/26 09:16:54  cgoos
 *	Added some typecasts to avoid compiler warnings.
 *	
 *	Revision 1.41  1999/05/19 07:28:59  cgoos
 *	Changes for 1000Base-T.
 *	
 *	Revision 1.40  1999/04/08 13:59:39  gklug
 *	fix: problem with 3Com switches endless RESTARTs
 *	
 *	Revision 1.39  1999/03/08 10:10:52  gklug
 *	fix: AutoSensing did switch to next mode even if LiPa indicated offline
 *	
 *	Revision 1.38  1999/03/08 09:49:03  gklug
 *	fix: Bug using pAC instead of IoC, causing AIX problems
 *	fix: change compare for Linux compiler bug workaround
 *	
 *	Revision 1.37  1999/01/28 14:51:33  gklug
 *	fix: monitor for autosensing and extra RESETS the RX on wire counters
 *	
 *	Revision 1.36  1999/01/22 09:19:55  gklug
 *	fix: Init DupMode and InitPauseMd are now called in RxTxEnable
 *	
 *	Revision 1.35  1998/12/11 15:22:59  gklug
 *	chg: autosensing: check for receive if manual mode was guessed
 *	chg: simplified workaround for XMAC errata
 *	chg: wait additional 100 ms before link goes up.
 *	chg: autoneg timeout to 600 ms
 *	chg: restart autoneg even if configured to autonegotiation
 *	
 *	Revision 1.34  1998/12/10 10:33:14  gklug
 *	add: more debug messages
 *	fix: do a new InitPhy if link went down (AutoSensing problem)
 *	chg: Check for zero shorts if link is NOT up
 *	chg: reset Port if link goes down
 *	chg: wait additional 100 ms when link comes up to check shorts
 *	fix: dummy read extended autoneg status to prevent link going down immediately
 *	
 *	Revision 1.33  1998/12/07 12:18:29  gklug
 *	add: refinement of autosense mode: take into account the autoneg cap of LiPa
 *	
 *	Revision 1.32  1998/12/07 07:11:21  gklug
 *	fix: compiler warning
 *	
 *	Revision 1.31  1998/12/02 09:29:05  gklug
 *	fix: WA XMAC Errata: FCSCt check was not correct.
 *	fix: WA XMAC Errata: Prec Counter were NOT updated in case of short checks.
 *	fix: Clear Stat : now clears the Prev counters of all known Ports
 *	
 *	Revision 1.30  1998/12/01 10:54:15  gklug
 *	dd: workaround for XMAC errata changed. Check RX count and CRC err Count, too.
 *	
 *	Revision 1.29  1998/12/01 10:01:53  gklug
 *	fix: if MAC IRQ occurs during port down, this will be handled correctly
 *	
 *	Revision 1.28  1998/11/26 16:22:11  gklug
 *	fix: bug in autosense if manual modes are used
 *	
 *	Revision 1.27  1998/11/26 15:50:06  gklug
 *	fix: PNMI needs to set PLinkModeConf
 *	
 *	Revision 1.26  1998/11/26 14:51:58  gklug
 *	add: AutoSensing functionalty
 *	
 *	Revision 1.25  1998/11/26 07:34:37  gklug
 *	fix: Init PrevShorts when restarting port due to Link connection
 *	
 *	Revision 1.24  1998/11/25 10:57:32  gklug
 *	fix: remove unreferenced local vars
 *	
 *	Revision 1.23  1998/11/25 08:26:40  gklug
 *	fix: don't do a RESET on a starting or stopping port
 *	
 *	Revision 1.22  1998/11/24 13:29:44  gklug
 *	add: Workaround for MAC parity errata
 *	
 *	Revision 1.21  1998/11/18 15:31:06  gklug
 *	fix: lint bugs
 *	
 *	Revision 1.20  1998/11/18 12:58:54  gklug
 *	fix: use PNMI query instead of hardware access
 *	
 *	Revision 1.19  1998/11/18 12:54:55  gklug
 *	chg: add new workaround for XMAC Errata
 *	add: short event counter monitoring on active link too
 *	
 *	Revision 1.18  1998/11/13 14:27:41  malthoff
 *	Bug Fix: Packet Arbiter Timeout was not cleared correctly
 *	for timeout on TX1 and TX2.
 *	
 *	Revision 1.17  1998/11/04 07:01:59  cgoos
 *	Moved HW link poll sequence.
 *	Added call to SkXmRxTxEnable.
 *	
 *	Revision 1.16  1998/11/03 13:46:03  gklug
 *	add: functionality of SET_LMODE and SET_FLOW_MODE
 *	fix: send RLMT LinkDown event when Port stop is given with LinkUp
 *	
 *	Revision 1.15  1998/11/03 12:56:47  gklug
 *	fix: Needs more events
 *	
 *	Revision 1.14  1998/10/30 07:36:35  gklug
 *	rmv: unnecessary code
 *	
 *	Revision 1.13  1998/10/29 15:21:57  gklug
 *	add: Poll link feature for activating HW link
 *	fix: Deactivate HWLink when Port STOP is given
 *	
 *	Revision 1.12  1998/10/28 07:38:57  cgoos
 *	Checking link status at begin of SkHWLinkUp.
 *	
 *	Revision 1.11  1998/10/22 09:46:50  gklug
 *	fix SysKonnectFileId typo
 *	
 *	Revision 1.10  1998/10/14 13:57:47  gklug
 *	add: Port start/stop event
 *	
 *	Revision 1.9  1998/10/14 05:48:29  cgoos
 *	Added definition for Para.
 *	
 *	Revision 1.8  1998/10/14 05:40:09  gklug
 *	add: Hardware Linkup signal used
 *	
 *	Revision 1.7  1998/10/09 06:50:20  malthoff
 *	Remove ID_sccs by SysKonnectFileId.
 *
 *	Revision 1.6  1998/10/08 09:11:49  gklug
 *	add: clear IRQ commands
 *	
 *	Revision 1.5  1998/10/02 14:27:35  cgoos
 *	Fixed some typos and wrong event names.
 *	
 *	Revision 1.4  1998/10/02 06:24:17  gklug
 *	add: HW error function
 *	fix: OUT macros
 *	
 *	Revision 1.3  1998/10/01 07:03:00  gklug
 *	add: ISR for the usual interrupt source register
 *	
 *	Revision 1.2  1998/09/03 13:50:33  gklug
 *	add: function prototypes
 *	
 *	Revision 1.1  1998/08/27 11:50:21  gklug
 *	initial revision
 *	
 *
 *
 ******************************************************************************/


/*
	Special Interrupt handler

	The following abstract should show how this module is included
	in the driver path:

	In the ISR of the driver the bits for frame transmission complete and
	for receive complete are checked and handled by the driver itself.
	The bits of the slow path mask are checked after this and then the
	entry into the so-called "slow path" is prepared. It is an implemetors
	decision whether this is executed directly or just scheduled by
	disabling the mask. In the interrupt service routine events may be
	generated, so it would be a good idea to call the EventDispatcher
	right after this ISR.

	The Interrupt service register of the adapter is NOT read by this
	module. SO if the drivers implemetor needs a while loop around the
	slow data paths Interrupt bits, he needs to call the SkGeIsr() for
	each loop entered.

	However, the XMAC Interrupt status registers are read in a while loop.

*/
static const char SysKonnectFileId[] =
	"$Id: skgesirq.c,v 1.55 2000/06/19 08:36:25 cgoos Exp $" ;

#include "h/skdrv1st.h"		/* Driver Specific Definitions */
#include "h/skgepnmi.h"		/* PNMI Definitions */
#include "h/skrlmt.h"		/* RLMT Definitions */
#include "h/skdrv2nd.h"		/* Adapter Control- and Driver specific Def. */


/* local function prototypes */
static int	SkGePortCheckUpXmac(SK_AC*, SK_IOC, int);
static int	SkGePortCheckUpBcom(SK_AC*, SK_IOC, int);
static int	SkGePortCheckUpLone(SK_AC*, SK_IOC, int);
static int	SkGePortCheckUpNat(SK_AC*, SK_IOC, int);
static void	SkPhyIsrBcom(SK_AC*, SK_IOC, int, SK_U16);
static void	SkPhyIsrLone(SK_AC*, SK_IOC, int, SK_U16);


#ifdef __C2MAN__
/*
	Special IRQ function

	General Description:

 */
intro()
{}
#endif

/*
 * Define return codes of SkGePortCheckUp and CheckShort
 */
#define	SK_HW_PS_NONE		0	/* No action needed */
#define	SK_HW_PS_RESTART	1	/* Restart needed */
#define	SK_HW_PS_LINK		2	/* Link Up actions needed */

/******************************************************************************
 *
 *	SkHWInitDefSense() - Default Autosensing mode initialization
 *
 * Description:
 *	This function handles the Hardware link down signal
 *
 * Note:
 *
 */
void	SkHWInitDefSense(
SK_AC	*pAC,		/* adapter context */
SK_IOC	IoC,		/* IO context */
int	Port)		/* Port Index (MAC_1 + n) */
{
	SK_GEPORT	*pPrt;

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

	pPrt->PAutoNegTimeOut = 0;

	if (pPrt->PLinkModeConf != SK_LMODE_AUTOSENSE) {
		pPrt->PLinkMode = pPrt->PLinkModeConf;
		return;
	}

	SK_DBG_MSG(pAC,SK_DBGMOD_HWM,SK_DBGCAT_IRQ,
		("AutoSensing: First mode %d on Port %d\n",
		(int) SK_LMODE_AUTOFULL,
		 Port));

	pPrt->PLinkMode = SK_LMODE_AUTOFULL;

	return;
}

/******************************************************************************
 *
 *	SkHWSenseGetNext() - GetNextAutosensing Mode
 *
 * Description:
 *	This function handles the AutoSensing
 *
 * Note:
 *
 */
SK_U8	SkHWSenseGetNext(
SK_AC	*pAC,		/* adapter context */
SK_IOC	IoC,		/* IO context */
int	Port)		/* Port Index (MAC_1 + n) */
{
	SK_GEPORT	*pPrt;

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

	pPrt->PAutoNegTimeOut = 0;

	if (pPrt->PLinkModeConf != SK_LMODE_AUTOSENSE) {
		/* Leave all as configured */
		return(pPrt->PLinkModeConf);
	}

	if (pPrt->PLinkMode == SK_LMODE_AUTOFULL) {
		/* Return next mode AUTOBOTH */
		return(SK_LMODE_AUTOBOTH);
	}

	/* Return default autofull */
	return(SK_LMODE_AUTOFULL);
}

/******************************************************************************
 *
 *	SkHWSenseSetNext() - Autosensing Set next mode
 *
 * Description:
 *	This function sets the appropriate next mode.
 *
 * Note:
 *
 */
void	SkHWSenseSetNext(
SK_AC	*pAC,		/* adapter context */
SK_IOC	IoC,		/* IO context */
int	Port,		/* Port Index (MAC_1 + n) */
SK_U8	NewMode)	/* New Mode to be written in sense mode */
{
	SK_GEPORT	*pPrt;

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

	pPrt->PAutoNegTimeOut = 0;

	if (pPrt->PLinkModeConf != SK_LMODE_AUTOSENSE) {
		return;
	}

	SK_DBG_MSG(pAC,SK_DBGMOD_HWM,SK_DBGCAT_IRQ,
		("AutoSensing: next mode %d on Port %d\n", (int) NewMode,
		 Port));
	pPrt->PLinkMode = NewMode;

	return;
}

/******************************************************************************
 *
 *	SkHWLinkDown() - Link Down handling
 *
 * Description:
 *	This function handles the Hardware link down signal
 *
 * Note:
 *
 */
void	SkHWLinkDown(
SK_AC	*pAC,		/* adapter context */
SK_IOC	IoC,		/* IO context */
int	Port)		/* Port Index (MAC_1 + n) */
{
	SK_GEPORT	*pPrt;
	SK_U16		Word;

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

	/* Disable all XMAC interrupts */
	XM_OUT16(IoC, Port, XM_IMSK, 0xffff);

	/* Disable Receive and Transmitter */
	XM_IN16(IoC, Port, XM_MMU_CMD, &Word);
	XM_OUT16(IoC, Port, XM_MMU_CMD, Word & ~(XM_MMU_ENA_RX|XM_MMU_ENA_TX));
	
	/* disable all PHY interrupts */
	switch (pAC->GIni.GP[Port].PhyType) {
		case SK_PHY_BCOM:
			/* make sure that PHY is initialized */
			if (pAC->GIni.GP[Port].PState) {
				/* Workaround BCOM Errata (#10523) all BCom */
				/* Disable Power Management if link is down */
				PHY_READ(IoC, pPrt, Port, PHY_BCOM_AUX_CTRL,
					&Word);
				PHY_WRITE(IoC, pPrt, Port, PHY_BCOM_AUX_CTRL,	
					Word | PHY_B_AC_DIS_PM);
			}
			PHY_WRITE(IoC, pPrt, Port, PHY_BCOM_INT_MASK, 
				0xffff);
			break;
		case SK_PHY_LONE:
			PHY_WRITE(IoC, pPrt, Port, PHY_LONE_INT_ENAB, 
				0x0);
			break;
		case SK_PHY_NAT:
			/* todo: National
			PHY_WRITE(IoC, pPrt, Port, PHY_NAT_INT_MASK, 
				0xffff); */
			break;
	}

	/* Init default sense mode */
	SkHWInitDefSense(pAC, IoC, Port);

	if (!pPrt->PHWLinkUp) {
		return;
	} 

	SK_DBG_MSG(pAC,SK_DBGMOD_HWM,SK_DBGCAT_IRQ,
		("Link down Port %d\n", Port));

	/* Set Link to DOWN */
	pPrt->PHWLinkUp = SK_FALSE;

	/* Reset Port stati */
	pPrt->PLinkModeStatus = SK_LMODE_STAT_UNKNOWN;
	pPrt->PFlowCtrlStatus = SK_FLOW_STAT_NONE ;

	/*
	 * Reinit Phy especially when the AutoSense default is set now
	 */
	SkXmInitPhy(pAC, IoC, Port, SK_FALSE);

	/*
	 * GP0: used for workaround of Rev. C
	 * Errata 2
	 */

	/* Do NOT signal to RLMT */

	/* Do NOT start the timer here */
}

/******************************************************************************
 *
 *	SkHWLinkUp() - Link Up handling
 *
 * Description:
 *	This function handles the Hardware link up signal
 *
 * Note:
 *
 */
void	SkHWLinkUp(
SK_AC	*pAC,		/* adapter context */
SK_IOC	IoC,		/* IO context */
int	Port)		/* Port Index (MAC_1 + n) */
{
	SK_GEPORT	*pPrt;

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

	if (pPrt->PHWLinkUp) {
		/* We do NOT need to proceed on active link */
		return;
	} 

	pPrt->PHWLinkUp = SK_TRUE ;
	pPrt->PAutoNegFail = SK_FALSE ;
	pPrt->PLinkModeStatus = SK_LMODE_STAT_UNKNOWN;

	if (pPrt->PLinkMode != SK_LMODE_AUTOHALF &&
	    pPrt->PLinkMode != SK_LMODE_AUTOFULL &&
	    pPrt->PLinkMode != SK_LMODE_AUTOBOTH) {
		/* Link is up and no Autonegotiation should be done */

		/* Configure Port */

		/* Set Link Mode */
		if (pPrt->PLinkMode == SK_LMODE_FULL) {