ip2main.c

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	if ( Eisa_irq ) {
		printk(KERN_DEBUG ", Interrupt %d %s\n",
		       setup_irq, (ismine & 2) ? "(edge)" : "(level)");
	} else {
		printk(KERN_DEBUG ", (polled)\n");
	}
#endif
	return setup_address;
}

/******************************************************************************/
/* Function:   set_irq()                                                      */
/* Parameters: index to board in board table                                  */
/*             IRQ to use                                                     */
/* Returns:    Success (0)                                                    */
/*                                                                            */
/* Description:                                                               */
/******************************************************************************/
static void
set_irq( int boardnum, int boardIrq )
{
	unsigned char tempCommand[16];
	i2eBordStrPtr pB = i2BoardPtrTable[boardnum];
	unsigned long flags;

	/*
	 * Notify the boards they may generate interrupts. This is done by
	 * sending an in-line command to channel 0 on each board. This is why
	 * the channels have to be defined already. For each board, if the
	 * interrupt has never been defined, we must do so NOW, directly, since
	 * board will not send flow control or even give an interrupt until this
	 * is done.  If polling we must send 0 as the interrupt parameter.
	 */

	// We will get an interrupt here at the end of this function

	iiDisableMailIrq(pB);

	/* We build up the entire packet header. */
	CHANNEL_OF(tempCommand) = 0;
	PTYPE_OF(tempCommand) = PTYPE_INLINE;
	CMD_COUNT_OF(tempCommand) = 2;
	(CMD_OF(tempCommand))[0] = CMDVALUE_IRQ;
	(CMD_OF(tempCommand))[1] = boardIrq;
	/*
	 * Write to FIFO; don't bother to adjust fifo capacity for this, since
	 * board will respond almost immediately after SendMail hit.
	 */
	WRITE_LOCK_IRQSAVE(&pB->write_fifo_spinlock,flags);
	iiWriteBuf(pB, tempCommand, 4);
	WRITE_UNLOCK_IRQRESTORE(&pB->write_fifo_spinlock,flags);
	pB->i2eUsingIrq = boardIrq;
	pB->i2eOutMailWaiting |= MB_OUT_STUFFED;

	/* Need to update number of boards before you enable mailbox int */
	++i2nBoards;

	CHANNEL_OF(tempCommand) = 0;
	PTYPE_OF(tempCommand) = PTYPE_BYPASS;
	CMD_COUNT_OF(tempCommand) = 6;
	(CMD_OF(tempCommand))[0] = 88;	// SILO
	(CMD_OF(tempCommand))[1] = 64;	// chars
	(CMD_OF(tempCommand))[2] = 32;	// ms

	(CMD_OF(tempCommand))[3] = 28;	// MAX_BLOCK
	(CMD_OF(tempCommand))[4] = 64;	// chars

	(CMD_OF(tempCommand))[5] = 87;	// HW_TEST
	WRITE_LOCK_IRQSAVE(&pB->write_fifo_spinlock,flags);
	iiWriteBuf(pB, tempCommand, 8);
	WRITE_UNLOCK_IRQRESTORE(&pB->write_fifo_spinlock,flags);

	CHANNEL_OF(tempCommand) = 0;
	PTYPE_OF(tempCommand) = PTYPE_BYPASS;
	CMD_COUNT_OF(tempCommand) = 1;
	(CMD_OF(tempCommand))[0] = 84;	/* get BOX_IDS */
	iiWriteBuf(pB, tempCommand, 3);

#ifdef XXX
	// enable heartbeat for test porpoises
	CHANNEL_OF(tempCommand) = 0;
	PTYPE_OF(tempCommand) = PTYPE_BYPASS;
	CMD_COUNT_OF(tempCommand) = 2;
	(CMD_OF(tempCommand))[0] = 44;	/* get ping */
	(CMD_OF(tempCommand))[1] = 200;	/* 200 ms */
	WRITE_LOCK_IRQSAVE(&pB->write_fifo_spinlock,flags);
	iiWriteBuf(pB, tempCommand, 4);
	WRITE_UNLOCK_IRQRESTORE(&pB->write_fifo_spinlock,flags);
#endif

	iiEnableMailIrq(pB);
	iiSendPendingMail(pB);
}

/******************************************************************************/
/* Interrupt Handler Section                                                  */
/******************************************************************************/

static inline void
service_all_boards()
{
	int i;
	i2eBordStrPtr  pB;

	/* Service every board on the list */
	for( i = 0; i < IP2_MAX_BOARDS; ++i ) {
		pB = i2BoardPtrTable[i];
		if ( pB ) {
			i2ServiceBoard( pB );
		}
	}
}


/******************************************************************************/
/* Function:   ip2_interrupt_bh(pB)                                           */
/* Parameters: pB - pointer to the board structure                            */
/* Returns:    Nothing                                                        */
/*                                                                            */
/* Description:                                                               */
/*	Service the board in a bottom half interrupt handler and then         */
/*	reenable the board's interrupts if it has an IRQ number               */
/*                                                                            */
/******************************************************************************/
static void
ip2_interrupt_bh(i2eBordStrPtr pB)
{
//	pB better well be set or we have a problem!  We can only get
//	here from the IMMEDIATE queue.  Here, we process the boards.
//	Checking pB doesn't cost much and it saves us from the sanity checkers.

	bh_counter++; 

	if ( pB ) {
		i2ServiceBoard( pB );
		if( pB->i2eUsingIrq ) {
//			Re-enable his interrupts
			iiEnableMailIrq(pB);
		}
	}
}


/******************************************************************************/
/* Function:   ip2_interrupt(int irq, void *dev_id, struct pt_regs * regs)    */
/* Parameters: irq - interrupt number                                         */
/*             pointer to optional device ID structure                        */
/*             pointer to register structure                                  */
/* Returns:    Nothing                                                        */
/*                                                                            */
/* Description:                                                               */
/*                                                                            */
/*	Our task here is simply to identify each board which needs servicing. */
/*	If we are queuing then, queue it to be serviced, and disable its irq  */
/*	mask otherwise process the board directly.                            */
/*                                                                            */
/*	We could queue by IRQ but that just complicates things on both ends   */
/*	with very little gain in performance (how many instructions does      */
/*	it take to iterate on the immediate queue).                           */
/*                                                                            */
/*                                                                            */
/******************************************************************************/
static void
ip2_interrupt(int irq, void *dev_id, struct pt_regs * regs)
{
	int i;
	i2eBordStrPtr  pB;

	ip2trace (ITRC_NO_PORT, ITRC_INTR, 99, 1, irq );

	/* Service just the boards on the list using this irq */
	for( i = 0; i < i2nBoards; ++i ) {
		pB = i2BoardPtrTable[i];

//		Only process those boards which match our IRQ.
//			IRQ = 0 for polled boards, we won't poll "IRQ" boards

		if ( pB && (pB->i2eUsingIrq == irq) ) {
#ifdef USE_IQI

		    if (NO_MAIL_HERE != ( pB->i2eStartMail = iiGetMail(pB))) {
//			Disable his interrupt (will be enabled when serviced)
//			This is mostly to protect from reentrancy.
			iiDisableMailIrq(pB);

//			Park the board on the immediate queue for processing.
			queue_task(&pB->tqueue_interrupt, &tq_immediate);

//			Make sure the immediate queue is flagged to fire.
			mark_bh(IMMEDIATE_BH);
		    }
#else
//		We are using immediate servicing here.  This sucks and can
//		cause all sorts of havoc with ppp and others.  The failsafe
//		check on iiSendPendingMail could also throw a hairball.
			i2ServiceBoard( pB );
#endif /* USE_IQI */
		}
	}

	++irq_counter;

	ip2trace (ITRC_NO_PORT, ITRC_INTR, ITRC_RETURN, 0 );
}

/******************************************************************************/
/* Function:   ip2_poll(unsigned long arg)                                    */
/* Parameters: ?                                                              */
/* Returns:    Nothing                                                        */
/*                                                                            */
/* Description:                                                               */
/* This function calls the library routine i2ServiceBoard for each board in   */
/* the board table. This is used instead of the interrupt routine when polled */
/* mode is specified.                                                         */
/******************************************************************************/
static void
ip2_poll(unsigned long arg)
{
	ip2trace (ITRC_NO_PORT, ITRC_INTR, 100, 0 );

	TimerOn = 0; // it's the truth but not checked in service

	// Just polled boards, IRQ = 0 will hit all non-interrupt boards.
	// It will NOT poll boards handled by hard interrupts.
	// The issue of queued BH interrups is handled in ip2_interrupt().
	ip2_interrupt(0, NULL, NULL);

	PollTimer.expires = POLL_TIMEOUT;
	add_timer( &PollTimer );
	TimerOn = 1;

	ip2trace (ITRC_NO_PORT, ITRC_INTR, ITRC_RETURN, 0 );
}

static inline void 
do_input( i2ChanStrPtr pCh )
{
	unsigned long flags;

	ip2trace(CHANN, ITRC_INPUT, 21, 0 );

	// Data input
	if ( pCh->pTTY != NULL ) {
		READ_LOCK_IRQSAVE(&pCh->Ibuf_spinlock,flags)
		if (!pCh->throttled && (pCh->Ibuf_stuff != pCh->Ibuf_strip)) {
			READ_UNLOCK_IRQRESTORE(&pCh->Ibuf_spinlock,flags)
			i2Input( pCh );
		} else
			READ_UNLOCK_IRQRESTORE(&pCh->Ibuf_spinlock,flags)
	} else {
		ip2trace(CHANN, ITRC_INPUT, 22, 0 );

		i2InputFlush( pCh );
	}
}

// code duplicated from n_tty (ldisc)
static inline void 
isig(int sig, struct tty_struct *tty, int flush)
{
	if (tty->pgrp > 0)
		kill_pg(tty->pgrp, sig, 1);
	if (flush || !L_NOFLSH(tty)) {
		if ( tty->ldisc.flush_buffer )  
			tty->ldisc.flush_buffer(tty);
		i2InputFlush( tty->driver_data );
	}
}

static inline void
do_status( i2ChanStrPtr pCh )
{
	int status;

	status =  i2GetStatus( pCh, (I2_BRK|I2_PAR|I2_FRA|I2_OVR) );

	ip2trace (CHANN, ITRC_STATUS, 21, 1, status );

	if (pCh->pTTY && (status & (I2_BRK|I2_PAR|I2_FRA|I2_OVR)) ) {
		if ( (status & I2_BRK) ) {
			// code duplicated from n_tty (ldisc)
			if (I_IGNBRK(pCh->pTTY))
				goto skip_this;
			if (I_BRKINT(pCh->pTTY)) {
				isig(SIGINT, pCh->pTTY, 1);
				goto skip_this;
			}
			wake_up_interruptible(&pCh->pTTY->read_wait);
		}
#ifdef NEVER_HAPPENS_AS_SETUP_XXX
	// and can't work because we don't know the_char
	// as the_char is reported on a seperate path
	// The intelligent board does this stuff as setup
	{
	char brkf = TTY_NORMAL;
	unsigned char brkc = '\0';
	unsigned char tmp;
		if ( (status & I2_BRK) ) {
			brkf = TTY_BREAK;
			brkc = '\0';
		} 
		else if (status & I2_PAR) {
			brkf = TTY_PARITY;
			brkc = the_char;
		} else if (status & I2_FRA) {
			brkf = TTY_FRAME;
			brkc = the_char;
		} else if (status & I2_OVR) {
			brkf = TTY_OVERRUN;
			brkc = the_char;
		}
		tmp = pCh->pTTY->real_raw;
		pCh->pTTY->real_raw = 0;
		pCh->pTTY->ldisc.receive_buf( pCh->pTTY, &brkc, &brkf, 1 );
		pCh->pTTY->real_raw = tmp;
	}
#endif /* NEVER_HAPPENS_AS_SETUP_XXX */
	}
skip_this:

	if ( status & (I2_DDCD | I2_DDSR | I2_DCTS | I2_DRI) ) {
		wake_up_interruptible(&pCh->delta_msr_wait);

		if ( (pCh->flags & ASYNC_CHECK_CD) && (status & I2_DDCD) ) {
			if ( status & I2_DCD ) {
				if ( pCh->wopen ) {
					wake_up_interruptible ( &pCh->open_wait );
				}
			} else if ( !(pCh->flags & ASYNC_CALLOUT_ACTIVE) ) {
				if (pCh->pTTY &&  (!(pCh->pTTY->termios->c_cflag & CLOCAL)) ) {
					tty_hangup( pCh->pTTY );
				}
			}
		}
	}

	ip2trace (CHANN, ITRC_STATUS, 26, 0 );
}

/******************************************************************************/
/* Device Open/Close/Ioctl Entry Point Section                                */
/******************************************************************************/

/******************************************************************************/
/* Function:   open_sanity_check()                                            */
/* Parameters: Pointer to tty structure                                       */
/*             Pointer to file structure                                      */
/* Returns:    Success or failure                                             */
/*                                                                            */
/* Description:                                                               */
/* Verifies the structure magic numbers and cross links.                      */
/******************************************************************************/
#ifdef IP2DEBUG_OPEN
static void 
open_sanity_check( i2ChanStrPtr pCh, i2eBordStrPtr pBrd )
{
	if ( pBrd->i2eValid != I2E_MAGIC ) {
		printk(KERN_ERR "IP2: invalid board structure\n" );
	} else if ( pBrd != pCh->pMyBord ) {
		printk(KERN_ERR "IP2: board structure pointer mismatch (%p)\n",
			 pCh->pMyBord );
	} else if ( pBrd->i2eChannelCnt < pCh->port_index ) {
		printk(KERN_ERR "IP2: bad device index (%d)\n", pCh->port_index );
	} else if (&((i2ChanStrPtr)pBrd->i2eChannelPtr)[pCh->port_index] != pCh) {
	} else {
		printk(KERN_INFO "IP2: all pointers check out!\n" );
	}
}
#endif


/******************************************************************************/
/* Function:   ip2_open()                                                     */
/* Parameters: Pointer to tty structure                                       */
/*             Pointer to file structure                                      */
/* Returns:    Success or failure                                             */
/*                                                                            */
/* Description: (MANDATORY)                                                   */
/* A successful device open has to run a gauntlet of checks before it         */
/* completes. After some sanity checking and pointer setup, the function      */
/* blocks until all conditions are satisfied. It then initialises the port to */
/* the default characteristics and returns.                                   */
/******************************************************************************/
static int
ip2_open( PTTY tty, struct file *pFile )
{
	wait_queue_t wait;
	int rc = 0;
	int do_clocal = 0;
	i2ChanStrPtr  pCh = DevTable[MINOR(tty->device)];

	ip2trace (MINOR(tty->device), ITRC_OPEN, ITRC_ENTER, 0 );

	if ( pCh == NULL ) {
		return -ENODEV;
	}
	/* Setup pointer links in device and tty structures */
	pCh->pTTY = tty;
	tty->driver_data = pCh;
	MOD_INC_USE_COUNT;