skgesirq.c

内核linux2.4.20,可跟rtlinux3.2打补丁 组成实时linux系统,编译内核

/******************************************************************************
 *
 * Name:	skgesirq.c
 * Project:	GEnesis, PCI Gigabit Ethernet Adapter
 * Version:	$Revision: 1.65 $
 * Date:	$Date: 2001/02/23 13:41:51 $
 * Purpose:	Special IRQ module
 *
 ******************************************************************************/

/******************************************************************************
 *
 *	(C)Copyright 1998-2000 SysKonnect 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 1.65  2001/02/23 13:41:51  gklug
 *	fix: PHYS2INST should be used correctly for Dual Net operation
 *	chg: do no longer work with older PNMI
 *	
 *	Revision 1.64  2001/02/15 11:27:04  rassmann
 *	Working with RLMT v1 if SK_MAX_NETS undefined.
 *	
 *	Revision 1.63  2001/02/06 10:44:23  mkunz
 *	- NetIndex added to interface functions of pnmi V4 with dual net support
 *	
 *	Revision 1.62  2001/01/31 15:31:41  gklug
 *	fix: problem with autosensing an SR8800 switch
 *	
 *	Revision 1.61  2000/11/09 11:30:09  rassmann
 *	WA: Waiting after releasing reset until BCom chip is accessible.
 *
 *	Revision 1.60  2000/10/18 12:37:48  cgoos
 *	Reinserted the comment for version 1.56.
 *	
 *	Revision 1.59  2000/10/18 12:22:20  cgoos
 *	Added workaround for half duplex hangup.
 *	
 *	Revision 1.58  2000/09/28 13:06:04  gklug
 *	fix: BCOM may NOT be touched if XMAC is in RESET state
 *	
 *	Revision 1.57  2000/09/08 12:38:39  cgoos
 *	Added forgotten variable declaration.
 *	
 *	Revision 1.56  2000/09/08 08:12:13  cgoos
 *	Changed handling of parity errors in SkGeHwErr (correct reset of error).
 *
 *	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 1.65 2001/02/23 13:41:51 gklug 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);

/*
 * Define an array of RX counter which are checked
 * in AutoSense mode to check whether a link is not able to autonegotiate.
 */
static const SK_U32 SkGeRxOids[]= {
	OID_SKGE_STAT_RX_64,
	OID_SKGE_STAT_RX_127,
	OID_SKGE_STAT_RX_255,
	OID_SKGE_STAT_RX_511,
	OID_SKGE_STAT_RX_1023,
	OID_SKGE_STAT_RX_MAX,
} ;

#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;
}	/* SkHWInitDefSense */


/******************************************************************************
 *
 *	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);
}	/* SkHWSenseGetNext */


/******************************************************************************
 *
 *	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;
}	/* SkHWSenseSetNext */


/******************************************************************************
 *
 *	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 Receiver 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 (pPrt->PhyType) {
		case SK_PHY_BCOM:
			/* Make sure that PHY is initialized. */
			if (pAC->GIni.GP[Port].PState) {
				/* NOT allowed if BCOM is in RESET state */
				/* 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. */
}	/* SkHWLinkDown */


/******************************************************************************
 *
 *	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) {
			pPrt->PLinkModeStatus = SK_LMODE_STAT_FULL;
		}
		else {
			pPrt->PLinkModeStatus = SK_LMODE_STAT_HALF;
		}

		/* No flow control without autonegotiation */
		pPrt->PFlowCtrlStatus = SK_FLOW_STAT_NONE;

		/* RX/TX enable */
		SkXmRxTxEnable(pAC, IoC, Port);
	}
}	/* SkHWLinkUp */


/******************************************************************************
 *
 * SkMacParity	- does everything to handle MAC parity errors correctly
 *
 */
static	void	SkMacParity(
SK_AC	*pAC,	/* adapter context */
SK_IOC	IoC,	/* IO context */
int	Port)		/* Port Index of the port failed */
{
	SK_EVPARA	Para;
	SK_GEPORT	*pPrt;		/* GIni Port struct pointer */
	SK_U64		TxMax;		/* TxMax Counter */
	unsigned	Len;