1 /*******************************************************************************
3 * (c) 1999 by Computone Corporation
5 ********************************************************************************
8 * PACKAGE: Linux tty Device Driver for IntelliPort family of multiport
9 * serial I/O controllers.
11 * DESCRIPTION: High-level interface code for the device driver. Uses the
12 * Extremely Low Level Interface Support (i2ellis.c). Provides an
13 * interface to the standard loadware, to support drivers or
14 * application code. (This is included source code, not a separate
15 * compilation module.)
17 *******************************************************************************/
18 //------------------------------------------------------------------------------
20 // Once the board has been initialized, it will interrupt us when:
21 // 1) It has something in the fifo for us to read (incoming data, flow control
22 // packets, or whatever).
23 // 2) It has stripped whatever we have sent last time in the FIFO (and
24 // consequently is ready for more).
26 // Note also that the buffer sizes declared in i2lib.h are VERY SMALL. This
27 // worsens performance considerably, but is done so that a great many channels
28 // might use only a little memory.
29 //------------------------------------------------------------------------------
31 //------------------------------------------------------------------------------
34 // 0.00 - 4/16/91 --- First Draft
35 // 0.01 - 4/29/91 --- 1st beta release
36 // 0.02 - 6/14/91 --- Changes to allow small model compilation
37 // 0.03 - 6/17/91 MAG Break reporting protected from interrupts routines with
38 // in-line asm added for moving data to/from ring buffers,
39 // replacing a variety of methods used previously.
40 // 0.04 - 6/21/91 MAG Initial flow-control packets not queued until
41 // i2_enable_interrupts time. Former versions would enqueue
42 // them at i2_init_channel time, before we knew how many
43 // channels were supposed to exist!
44 // 0.05 - 10/12/91 MAG Major changes: works through the ellis.c routines now;
45 // supports new 16-bit protocol and expandable boards.
46 // - 10/24/91 MAG Most changes in place and stable.
47 // 0.06 - 2/20/92 MAG Format of CMD_HOTACK corrected: the command takes no
49 // 0.07 -- 3/11/92 MAG Support added to store special packet types at interrupt
50 // level (mostly responses to specific commands.)
51 // 0.08 -- 3/30/92 MAG Support added for STAT_MODEM packet
52 // 0.09 -- 6/24/93 MAG i2Link... needed to update number of boards BEFORE
53 // turning on the interrupt.
54 // 0.10 -- 6/25/93 MAG To avoid gruesome death from a bad board, we sanity check
57 // 1.1 - 12/25/96 AKM Linux version.
58 // - 10/09/98 DMC Revised Linux version.
59 //------------------------------------------------------------------------------
65 #include <linux/sched.h>
69 //***********************
70 //* Function Prototypes *
71 //***********************
72 static void i2QueueNeeds(i2eBordStrPtr
, i2ChanStrPtr
, int);
73 static i2ChanStrPtr
i2DeQueueNeeds(i2eBordStrPtr
, int );
74 static void i2StripFifo(i2eBordStrPtr
);
75 static void i2StuffFifoBypass(i2eBordStrPtr
);
76 static void i2StuffFifoFlow(i2eBordStrPtr
);
77 static void i2StuffFifoInline(i2eBordStrPtr
);
78 static int i2RetryFlushOutput(i2ChanStrPtr
);
80 // Not a documented part of the library routines (careful...) but the Diagnostic
81 // i2diag.c finds them useful to help the throughput in certain limited
82 // single-threaded operations.
83 static void iiSendPendingMail(i2eBordStrPtr
);
84 static void serviceOutgoingFifo(i2eBordStrPtr
);
86 // Functions defined in ip2.c as part of interrupt handling
87 static void do_input(struct work_struct
*);
88 static void do_status(struct work_struct
*);
95 unsigned char DBGBuf
[0x4000];
99 WriteDBGBuf(char *s
, unsigned char *src
, unsigned short n
)
103 // XXX: We need a spin lock here if we ever use this again
105 while (*s
) { // copy label
109 while (n
--) { // copy data
116 fatality(i2eBordStrPtr pB
)
120 for (i
=0;i
<sizeof(DBGBuf
);i
++) {
123 printk("%02x ",DBGBuf
[i
]);
126 for (i
=0;i
<sizeof(DBGBuf
);i
++) {
129 if (DBGBuf
[i
] >= ' ' && DBGBuf
[i
] <= '~') {
130 printk(" %c ",DBGBuf
[i
]);
136 printk("Last index %x\n",I
);
138 #endif /* DEBUG_FIFO */
145 i2Validate ( i2ChanStrPtr pCh
)
147 //ip2trace(pCh->port_index, ITRC_VERIFY,ITRC_ENTER,2,pCh->validity,
148 // (CHANNEL_MAGIC | CHANNEL_SUPPORT));
149 return ((pCh
->validity
& (CHANNEL_MAGIC_BITS
| CHANNEL_SUPPORT
))
150 == (CHANNEL_MAGIC
| CHANNEL_SUPPORT
));
153 static void iiSendPendingMail_t(unsigned long data
)
155 i2eBordStrPtr pB
= (i2eBordStrPtr
)data
;
157 iiSendPendingMail(pB
);
160 //******************************************************************************
161 // Function: iiSendPendingMail(pB)
162 // Parameters: Pointer to a board structure
166 // If any outgoing mail bits are set and there is outgoing mailbox is empty,
167 // send the mail and clear the bits.
168 //******************************************************************************
170 iiSendPendingMail(i2eBordStrPtr pB
)
172 if (pB
->i2eOutMailWaiting
&& (!pB
->i2eWaitingForEmptyFifo
) )
174 if (iiTrySendMail(pB
, pB
->i2eOutMailWaiting
))
176 /* If we were already waiting for fifo to empty,
177 * or just sent MB_OUT_STUFFED, then we are
178 * still waiting for it to empty, until we should
179 * receive an MB_IN_STRIPPED from the board.
181 pB
->i2eWaitingForEmptyFifo
|=
182 (pB
->i2eOutMailWaiting
& MB_OUT_STUFFED
);
183 pB
->i2eOutMailWaiting
= 0;
184 pB
->SendPendingRetry
= 0;
186 /* The only time we hit this area is when "iiTrySendMail" has
187 failed. That only occurs when the outbound mailbox is
188 still busy with the last message. We take a short breather
189 to let the board catch up with itself and then try again.
190 16 Retries is the limit - then we got a borked board.
193 if( ++pB
->SendPendingRetry
< 16 ) {
194 setup_timer(&pB
->SendPendingTimer
,
195 iiSendPendingMail_t
, (unsigned long)pB
);
196 mod_timer(&pB
->SendPendingTimer
, jiffies
+ 1);
198 printk( KERN_ERR
"IP2: iiSendPendingMail unable to queue outbound mail\n" );
204 //******************************************************************************
205 // Function: i2InitChannels(pB, nChannels, pCh)
206 // Parameters: Pointer to Ellis Board structure
207 // Number of channels to initialize
208 // Pointer to first element in an array of channel structures
209 // Returns: Success or failure
213 // This function patches pointers, back-pointers, and initializes all the
214 // elements in the channel structure array.
216 // This should be run after the board structure is initialized, through having
217 // loaded the standard loadware (otherwise it complains).
219 // In any case, it must be done before any serious work begins initializing the
220 // irq's or sending commands...
222 //******************************************************************************
224 i2InitChannels ( i2eBordStrPtr pB
, int nChannels
, i2ChanStrPtr pCh
)
226 int index
, stuffIndex
;
229 if (pB
->i2eValid
!= I2E_MAGIC
) {
230 COMPLETE(pB
, I2EE_BADMAGIC
);
232 if (pB
->i2eState
!= II_STATE_STDLOADED
) {
233 COMPLETE(pB
, I2EE_BADSTATE
);
236 LOCK_INIT(&pB
->read_fifo_spinlock
);
237 LOCK_INIT(&pB
->write_fifo_spinlock
);
238 LOCK_INIT(&pB
->Dbuf_spinlock
);
239 LOCK_INIT(&pB
->Bbuf_spinlock
);
240 LOCK_INIT(&pB
->Fbuf_spinlock
);
242 // NO LOCK needed yet - this is init
244 pB
->i2eChannelPtr
= pCh
;
245 pB
->i2eChannelCnt
= nChannels
;
247 pB
->i2Fbuf_strip
= pB
->i2Fbuf_stuff
= 0;
248 pB
->i2Dbuf_strip
= pB
->i2Dbuf_stuff
= 0;
249 pB
->i2Bbuf_strip
= pB
->i2Bbuf_stuff
= 0;
251 pB
->SendPendingRetry
= 0;
253 memset ( pCh
, 0, sizeof (i2ChanStr
) * nChannels
);
255 for (index
= stuffIndex
= 0, ppCh
= (i2ChanStrPtr
*)(pB
->i2Fbuf
);
256 nChannels
&& index
< ABS_MOST_PORTS
;
259 if ( !(pB
->i2eChannelMap
[index
>> 4] & (1 << (index
& 0xf)) ) ) {
262 LOCK_INIT(&pCh
->Ibuf_spinlock
);
263 LOCK_INIT(&pCh
->Obuf_spinlock
);
264 LOCK_INIT(&pCh
->Cbuf_spinlock
);
265 LOCK_INIT(&pCh
->Pbuf_spinlock
);
266 // NO LOCK needed yet - this is init
267 // Set up validity flag according to support level
268 if (pB
->i2eGoodMap
[index
>> 4] & (1 << (index
& 0xf)) ) {
269 pCh
->validity
= CHANNEL_MAGIC
| CHANNEL_SUPPORT
;
271 pCh
->validity
= CHANNEL_MAGIC
;
273 pCh
->pMyBord
= pB
; /* Back-pointer */
275 // Prepare an outgoing flow-control packet to send as soon as the chance
277 if ( pCh
->validity
& CHANNEL_SUPPORT
) {
278 pCh
->infl
.hd
.i2sChannel
= index
;
279 pCh
->infl
.hd
.i2sCount
= 5;
280 pCh
->infl
.hd
.i2sType
= PTYPE_BYPASS
;
283 pCh
->infl
.room
= IBUF_SIZE
- 1;
285 pCh
->whenSendFlow
= (IBUF_SIZE
/5)*4; // when 80% full
287 // The following is similar to calling i2QueueNeeds, except that this
288 // is done in longhand, since we are setting up initial conditions on
289 // many channels at once.
290 pCh
->channelNeeds
= NEED_FLOW
; // Since starting from scratch
291 pCh
->sinceLastFlow
= 0; // No bytes received since last flow
292 // control packet was queued
294 *ppCh
++ = pCh
; // List this channel as needing
295 // initial flow control packet sent
298 // Don't allow anything to be sent until the status packets come in from
304 // Initialize all the ring buffers
306 pCh
->Ibuf_stuff
= pCh
->Ibuf_strip
= 0;
307 pCh
->Obuf_stuff
= pCh
->Obuf_strip
= 0;
308 pCh
->Cbuf_stuff
= pCh
->Cbuf_strip
= 0;
310 memset( &pCh
->icount
, 0, sizeof (struct async_icount
) );
311 pCh
->hotKeyIn
= HOT_CLEAR
;
312 pCh
->channelOptions
= 0;
314 init_waitqueue_head(&pCh
->pBookmarkWait
);
316 init_waitqueue_head(&pCh
->open_wait
);
317 init_waitqueue_head(&pCh
->close_wait
);
318 init_waitqueue_head(&pCh
->delta_msr_wait
);
320 // Set base and divisor so default custom rate is 9600
321 pCh
->BaudBase
= 921600; // MAX for ST654, changed after we get
322 pCh
->BaudDivisor
= 96; // the boxids (UART types) later
330 pCh
->speed
= CBR_9600
;
334 pCh
->ClosingDelay
= 5*HZ
/10;
335 pCh
->ClosingWaitTime
= 30*HZ
;
337 // Initialize task queue objects
338 INIT_WORK(&pCh
->tqueue_input
, do_input
);
339 INIT_WORK(&pCh
->tqueue_status
, do_status
);
341 #ifdef IP2DEBUG_TRACE
342 pCh
->trace
= ip2trace
;
348 // No need to check for wrap here; this is initialization.
349 pB
->i2Fbuf_stuff
= stuffIndex
;
350 COMPLETE(pB
, I2EE_GOOD
);
354 //******************************************************************************
355 // Function: i2DeQueueNeeds(pB, type)
356 // Parameters: Pointer to a board structure
357 // type bit map: may include NEED_INLINE, NEED_BYPASS, or NEED_FLOW
359 // Pointer to a channel structure
361 // Description: Returns pointer struct of next channel that needs service of
362 // the type specified. Otherwise returns a NULL reference.
364 //******************************************************************************
366 i2DeQueueNeeds(i2eBordStrPtr pB
, int type
)
368 unsigned short queueIndex
;
371 i2ChanStrPtr pCh
= NULL
;
377 WRITE_LOCK_IRQSAVE(&pB
->Dbuf_spinlock
,flags
);
378 if ( pB
->i2Dbuf_stuff
!= pB
->i2Dbuf_strip
)
380 queueIndex
= pB
->i2Dbuf_strip
;
381 pCh
= pB
->i2Dbuf
[queueIndex
];
383 if (queueIndex
>= CH_QUEUE_SIZE
) {
386 pB
->i2Dbuf_strip
= queueIndex
;
387 pCh
->channelNeeds
&= ~NEED_INLINE
;
389 WRITE_UNLOCK_IRQRESTORE(&pB
->Dbuf_spinlock
,flags
);
394 WRITE_LOCK_IRQSAVE(&pB
->Bbuf_spinlock
,flags
);
395 if (pB
->i2Bbuf_stuff
!= pB
->i2Bbuf_strip
)
397 queueIndex
= pB
->i2Bbuf_strip
;
398 pCh
= pB
->i2Bbuf
[queueIndex
];
400 if (queueIndex
>= CH_QUEUE_SIZE
) {
403 pB
->i2Bbuf_strip
= queueIndex
;
404 pCh
->channelNeeds
&= ~NEED_BYPASS
;
406 WRITE_UNLOCK_IRQRESTORE(&pB
->Bbuf_spinlock
,flags
);
411 WRITE_LOCK_IRQSAVE(&pB
->Fbuf_spinlock
,flags
);
412 if (pB
->i2Fbuf_stuff
!= pB
->i2Fbuf_strip
)
414 queueIndex
= pB
->i2Fbuf_strip
;
415 pCh
= pB
->i2Fbuf
[queueIndex
];
417 if (queueIndex
>= CH_QUEUE_SIZE
) {
420 pB
->i2Fbuf_strip
= queueIndex
;
421 pCh
->channelNeeds
&= ~NEED_FLOW
;
423 WRITE_UNLOCK_IRQRESTORE(&pB
->Fbuf_spinlock
,flags
);
426 printk(KERN_ERR
"i2DeQueueNeeds called with bad type:%x\n",type
);
432 //******************************************************************************
433 // Function: i2QueueNeeds(pB, pCh, type)
434 // Parameters: Pointer to a board structure
435 // Pointer to a channel structure
436 // type bit map: may include NEED_INLINE, NEED_BYPASS, or NEED_FLOW
440 // For each type of need selected, if the given channel is not already in the
441 // queue, adds it, and sets the flag indicating it is in the queue.
442 //******************************************************************************
444 i2QueueNeeds(i2eBordStrPtr pB
, i2ChanStrPtr pCh
, int type
)
446 unsigned short queueIndex
;
449 // We turn off all the interrupts during this brief process, since the
450 // interrupt-level code might want to put things on the queue as well.
456 WRITE_LOCK_IRQSAVE(&pB
->Dbuf_spinlock
,flags
);
457 if ( !(pCh
->channelNeeds
& NEED_INLINE
) )
459 pCh
->channelNeeds
|= NEED_INLINE
;
460 queueIndex
= pB
->i2Dbuf_stuff
;
461 pB
->i2Dbuf
[queueIndex
++] = pCh
;
462 if (queueIndex
>= CH_QUEUE_SIZE
)
464 pB
->i2Dbuf_stuff
= queueIndex
;
466 WRITE_UNLOCK_IRQRESTORE(&pB
->Dbuf_spinlock
,flags
);
471 WRITE_LOCK_IRQSAVE(&pB
->Bbuf_spinlock
,flags
);
472 if ((type
& NEED_BYPASS
) && !(pCh
->channelNeeds
& NEED_BYPASS
))
474 pCh
->channelNeeds
|= NEED_BYPASS
;
475 queueIndex
= pB
->i2Bbuf_stuff
;
476 pB
->i2Bbuf
[queueIndex
++] = pCh
;
477 if (queueIndex
>= CH_QUEUE_SIZE
)
479 pB
->i2Bbuf_stuff
= queueIndex
;
481 WRITE_UNLOCK_IRQRESTORE(&pB
->Bbuf_spinlock
,flags
);
486 WRITE_LOCK_IRQSAVE(&pB
->Fbuf_spinlock
,flags
);
487 if ((type
& NEED_FLOW
) && !(pCh
->channelNeeds
& NEED_FLOW
))
489 pCh
->channelNeeds
|= NEED_FLOW
;
490 queueIndex
= pB
->i2Fbuf_stuff
;
491 pB
->i2Fbuf
[queueIndex
++] = pCh
;
492 if (queueIndex
>= CH_QUEUE_SIZE
)
494 pB
->i2Fbuf_stuff
= queueIndex
;
496 WRITE_UNLOCK_IRQRESTORE(&pB
->Fbuf_spinlock
,flags
);
500 pCh
->channelNeeds
|= NEED_CREDIT
;
503 printk(KERN_ERR
"i2QueueNeeds called with bad type:%x\n",type
);
509 //******************************************************************************
510 // Function: i2QueueCommands(type, pCh, timeout, nCommands, pCs,...)
511 // Parameters: type - PTYPE_BYPASS or PTYPE_INLINE
512 // pointer to the channel structure
513 // maximum period to wait
514 // number of commands (n)
516 // Returns: Number of commands sent, or -1 for error
518 // get board lock before calling
521 // Queues up some commands to be sent to a channel. To send possibly several
522 // bypass or inline commands to the given channel. The timeout parameter
523 // indicates how many HUNDREDTHS OF SECONDS to wait until there is room:
524 // 0 = return immediately if no room, -ive = wait forever, +ive = number of
525 // 1/100 seconds to wait. Return values:
526 // -1 Some kind of nasty error: bad channel structure or invalid arguments.
527 // 0 No room to send all the commands
528 // (+) Number of commands sent
529 //******************************************************************************
531 i2QueueCommands(int type
, i2ChanStrPtr pCh
, int timeout
, int nCommands
,
532 cmdSyntaxPtr pCs0
,...)
543 unsigned short maxBlock
;
544 unsigned short maxBuff
;
546 unsigned short stuffIndex
;
548 unsigned char *pInsert
;
549 unsigned char *pDest
, *pSource
;
550 unsigned short channel
;
552 unsigned long flags
= 0;
553 rwlock_t
*lock_var_p
= NULL
;
555 // Make sure the channel exists, otherwise do nothing
556 if ( !i2Validate ( pCh
) ) {
560 ip2trace (CHANN
, ITRC_QUEUE
, ITRC_ENTER
, 0 );
564 // Board must also exist, and THE INTERRUPT COMMAND ALREADY SENT
565 if (pB
->i2eValid
!= I2E_MAGIC
|| pB
->i2eUsingIrq
== IRQ_UNDEFINED
) {
568 // If the board has gone fatal, return bad, and also hit the trap routine if
571 if ( pB
->i2eFatalTrap
) {
572 (*(pB
)->i2eFatalTrap
)(pB
);
576 // Set up some variables, Which buffers are we using? How big are they?
581 maxBlock
= MAX_OBUF_BLOCK
;
587 maxBlock
= MAX_CBUF_BLOCK
;
594 // Determine the total size required for all the commands
595 totalsize
= blocksize
= sizeof(i2CmdHeader
);
598 for ( count
= nCommands
; count
; count
--, ppCs
++)
602 // Will a new block be needed for this one?
603 // Two possible reasons: too
604 // big or previous command has to be at the end of a packet.
605 if ((blocksize
+ cnt
> maxBlock
) || lastended
) {
606 blocksize
= sizeof(i2CmdHeader
);
607 totalsize
+= sizeof(i2CmdHeader
);
612 // If this command had to end a block, then we will make sure to
613 // account for it should there be any more blocks.
614 lastended
= pCs
->flags
& END
;
617 // Make sure any pending flush commands go out before we add more data.
618 if ( !( pCh
->flush_flags
&& i2RetryFlushOutput( pCh
) ) ) {
619 // How much room (this time through) ?
622 lock_var_p
= &pCh
->Obuf_spinlock
;
623 WRITE_LOCK_IRQSAVE(lock_var_p
,flags
);
624 stuffIndex
= pCh
->Obuf_stuff
;
625 bufroom
= pCh
->Obuf_strip
- stuffIndex
;
628 lock_var_p
= &pCh
->Cbuf_spinlock
;
629 WRITE_LOCK_IRQSAVE(lock_var_p
,flags
);
630 stuffIndex
= pCh
->Cbuf_stuff
;
631 bufroom
= pCh
->Cbuf_strip
- stuffIndex
;
640 ip2trace (CHANN
, ITRC_QUEUE
, 2, 1, bufroom
);
642 // Check for overflow
643 if (totalsize
<= bufroom
) {
644 // Normal Expected path - We still hold LOCK
645 break; /* from for()- Enough room: goto proceed */
649 ip2trace (CHANN
, ITRC_QUEUE
, 3, 1, totalsize
);
651 // Prepare to wait for buffers to empty
652 WRITE_UNLOCK_IRQRESTORE(lock_var_p
,flags
);
653 serviceOutgoingFifo(pB
); // Dump what we got
656 return 0; // Tired of waiting
659 timeout
--; // So negative values == forever
661 if (!in_interrupt()) {
662 schedule_timeout_interruptible(1); // short nap
664 // we cannot sched/sleep in interrrupt silly
667 if (signal_pending(current
)) {
668 return 0; // Wake up! Time to die!!!
671 ip2trace (CHANN
, ITRC_QUEUE
, 4, 0 );
675 // At this point we have room and the lock - stick them in.
676 channel
= pCh
->infl
.hd
.i2sChannel
;
677 pInsert
= &pBuf
[stuffIndex
]; // Pointer to start of packet
678 pDest
= CMD_OF(pInsert
); // Pointer to start of command
680 // When we start counting, the block is the size of the header
681 for (blocksize
= sizeof(i2CmdHeader
), count
= nCommands
,
682 lastended
= 0, ppCs
= &pCs0
;
686 pCs
= *ppCs
; // Points to command protocol structure
688 // If this is a bookmark request command, post the fact that a bookmark
689 // request is pending. NOTE THIS TRICK ONLY WORKS BECAUSE CMD_BMARK_REQ
690 // has no parameters! The more general solution would be to reference
692 if (pCs
== CMD_BMARK_REQ
) {
695 ip2trace (CHANN
, ITRC_DRAIN
, 30, 1, pCh
->bookMarks
);
700 // If this command would put us over the maximum block size or
701 // if the last command had to be at the end of a block, we end
702 // the existing block here and start a new one.
703 if ((blocksize
+ cnt
> maxBlock
) || lastended
) {
705 ip2trace (CHANN
, ITRC_QUEUE
, 5, 0 );
707 PTYPE_OF(pInsert
) = type
;
708 CHANNEL_OF(pInsert
) = channel
;
709 // count here does not include the header
710 CMD_COUNT_OF(pInsert
) = blocksize
- sizeof(i2CmdHeader
);
711 stuffIndex
+= blocksize
;
712 if(stuffIndex
>= maxBuff
) {
716 pInsert
= &pBuf
[stuffIndex
]; // Pointer to start of next pkt
717 pDest
= CMD_OF(pInsert
);
718 blocksize
= sizeof(i2CmdHeader
);
720 // Now we know there is room for this one in the current block
722 blocksize
+= cnt
; // Total bytes in this command
723 pSource
= pCs
->cmd
; // Copy the command into the buffer
725 *pDest
++ = *pSource
++;
727 // If this command had to end a block, then we will make sure to account
728 // for it should there be any more blocks.
729 lastended
= pCs
->flags
& END
;
731 // Clean up the final block by writing header, etc
733 PTYPE_OF(pInsert
) = type
;
734 CHANNEL_OF(pInsert
) = channel
;
735 // count here does not include the header
736 CMD_COUNT_OF(pInsert
) = blocksize
- sizeof(i2CmdHeader
);
737 stuffIndex
+= blocksize
;
738 if(stuffIndex
>= maxBuff
) {
742 // Updates the index, and post the need for service. When adding these to
743 // the queue of channels, we turn off the interrupt while doing so,
744 // because at interrupt level we might want to push a channel back to the
749 pCh
->Obuf_stuff
= stuffIndex
; // Store buffer pointer
750 WRITE_UNLOCK_IRQRESTORE(&pCh
->Obuf_spinlock
,flags
);
752 pB
->debugInlineQueued
++;
753 // Add the channel pointer to list of channels needing service (first
754 // come...), if it's not already there.
755 i2QueueNeeds(pB
, pCh
, NEED_INLINE
);
759 pCh
->Cbuf_stuff
= stuffIndex
; // Store buffer pointer
760 WRITE_UNLOCK_IRQRESTORE(&pCh
->Cbuf_spinlock
,flags
);
762 pB
->debugBypassQueued
++;
763 // Add the channel pointer to list of channels needing service (first
764 // come...), if it's not already there.
765 i2QueueNeeds(pB
, pCh
, NEED_BYPASS
);
769 ip2trace (CHANN
, ITRC_QUEUE
, ITRC_RETURN
, 1, nCommands
);
771 return nCommands
; // Good status: number of commands sent
774 //******************************************************************************
775 // Function: i2GetStatus(pCh,resetBits)
776 // Parameters: Pointer to a channel structure
777 // Bit map of status bits to clear
778 // Returns: Bit map of current status bits
781 // Returns the state of data set signals, and whether a break has been received,
782 // (see i2lib.h for bit-mapped result). resetBits is a bit-map of any status
783 // bits to be cleared: I2_BRK, I2_PAR, I2_FRA, I2_OVR,... These are cleared
784 // AFTER the condition is passed. If pCh does not point to a valid channel,
785 // returns -1 (which would be impossible otherwise.
786 //******************************************************************************
788 i2GetStatus(i2ChanStrPtr pCh
, int resetBits
)
790 unsigned short status
;
793 ip2trace (CHANN
, ITRC_STATUS
, ITRC_ENTER
, 2, pCh
->dataSetIn
, resetBits
);
795 // Make sure the channel exists, otherwise do nothing */
796 if ( !i2Validate ( pCh
) )
801 status
= pCh
->dataSetIn
;
803 // Clear any specified error bits: but note that only actual error bits can
804 // be cleared, regardless of the value passed.
807 pCh
->dataSetIn
&= ~(resetBits
& (I2_BRK
| I2_PAR
| I2_FRA
| I2_OVR
));
808 pCh
->dataSetIn
&= ~(I2_DDCD
| I2_DCTS
| I2_DDSR
| I2_DRI
);
811 ip2trace (CHANN
, ITRC_STATUS
, ITRC_RETURN
, 1, pCh
->dataSetIn
);
816 //******************************************************************************
817 // Function: i2Input(pChpDest,count)
818 // Parameters: Pointer to a channel structure
819 // Pointer to data buffer
820 // Number of bytes to read
821 // Returns: Number of bytes read, or -1 for error
824 // Strips data from the input buffer and writes it to pDest. If there is a
825 // collosal blunder, (invalid structure pointers or the like), returns -1.
826 // Otherwise, returns the number of bytes read.
827 //******************************************************************************
829 i2Input(i2ChanStrPtr pCh
)
832 unsigned short stripIndex
;
834 unsigned long flags
= 0;
836 ip2trace (CHANN
, ITRC_INPUT
, ITRC_ENTER
, 0);
838 // Ensure channel structure seems real
839 if ( !i2Validate( pCh
) ) {
843 WRITE_LOCK_IRQSAVE(&pCh
->Ibuf_spinlock
,flags
);
845 // initialize some accelerators and private copies
846 stripIndex
= pCh
->Ibuf_strip
;
848 count
= pCh
->Ibuf_stuff
- stripIndex
;
850 // If buffer is empty or requested data count was 0, (trivial case) return
851 // without any further thought.
853 WRITE_UNLOCK_IRQRESTORE(&pCh
->Ibuf_spinlock
,flags
);
856 // Adjust for buffer wrap
860 // Don't give more than can be taken by the line discipline
861 amountToMove
= pCh
->pTTY
->receive_room
;
862 if (count
> amountToMove
) {
863 count
= amountToMove
;
865 // How much could we copy without a wrap?
866 amountToMove
= IBUF_SIZE
- stripIndex
;
868 if (amountToMove
> count
) {
869 amountToMove
= count
;
871 // Move the first block
872 pCh
->pTTY
->ldisc
.receive_buf( pCh
->pTTY
,
873 &(pCh
->Ibuf
[stripIndex
]), NULL
, amountToMove
);
874 // If we needed to wrap, do the second data move
875 if (count
> amountToMove
) {
876 pCh
->pTTY
->ldisc
.receive_buf( pCh
->pTTY
,
877 pCh
->Ibuf
, NULL
, count
- amountToMove
);
879 // Bump and wrap the stripIndex all at once by the amount of data read. This
880 // method is good regardless of whether the data was in one or two pieces.
882 if (stripIndex
>= IBUF_SIZE
) {
883 stripIndex
-= IBUF_SIZE
;
885 pCh
->Ibuf_strip
= stripIndex
;
887 // Update our flow control information and possibly queue ourselves to send
888 // it, depending on how much data has been stripped since the last time a
890 pCh
->infl
.asof
+= count
;
892 if ((pCh
->sinceLastFlow
+= count
) >= pCh
->whenSendFlow
) {
893 pCh
->sinceLastFlow
-= pCh
->whenSendFlow
;
894 WRITE_UNLOCK_IRQRESTORE(&pCh
->Ibuf_spinlock
,flags
);
895 i2QueueNeeds(pCh
->pMyBord
, pCh
, NEED_FLOW
);
897 WRITE_UNLOCK_IRQRESTORE(&pCh
->Ibuf_spinlock
,flags
);
902 ip2trace (CHANN
, ITRC_INPUT
, ITRC_RETURN
, 1, count
);
907 //******************************************************************************
908 // Function: i2InputFlush(pCh)
909 // Parameters: Pointer to a channel structure
910 // Returns: Number of bytes stripped, or -1 for error
913 // Strips any data from the input buffer. If there is a collosal blunder,
914 // (invalid structure pointers or the like), returns -1. Otherwise, returns the
915 // number of bytes stripped.
916 //******************************************************************************
918 i2InputFlush(i2ChanStrPtr pCh
)
923 // Ensure channel structure seems real
924 if ( !i2Validate ( pCh
) )
927 ip2trace (CHANN
, ITRC_INPUT
, 10, 0);
929 WRITE_LOCK_IRQSAVE(&pCh
->Ibuf_spinlock
,flags
);
930 count
= pCh
->Ibuf_stuff
- pCh
->Ibuf_strip
;
932 // Adjust for buffer wrap
937 // Expedient way to zero out the buffer
938 pCh
->Ibuf_strip
= pCh
->Ibuf_stuff
;
941 // Update our flow control information and possibly queue ourselves to send
942 // it, depending on how much data has been stripped since the last time a
945 pCh
->infl
.asof
+= count
;
947 if ( (pCh
->sinceLastFlow
+= count
) >= pCh
->whenSendFlow
)
949 pCh
->sinceLastFlow
-= pCh
->whenSendFlow
;
950 WRITE_UNLOCK_IRQRESTORE(&pCh
->Ibuf_spinlock
,flags
);
951 i2QueueNeeds(pCh
->pMyBord
, pCh
, NEED_FLOW
);
953 WRITE_UNLOCK_IRQRESTORE(&pCh
->Ibuf_spinlock
,flags
);
956 ip2trace (CHANN
, ITRC_INPUT
, 19, 1, count
);
961 //******************************************************************************
962 // Function: i2InputAvailable(pCh)
963 // Parameters: Pointer to a channel structure
964 // Returns: Number of bytes available, or -1 for error
967 // If there is a collosal blunder, (invalid structure pointers or the like),
968 // returns -1. Otherwise, returns the number of bytes stripped. Otherwise,
969 // returns the number of bytes available in the buffer.
970 //******************************************************************************
973 i2InputAvailable(i2ChanStrPtr pCh
)
977 // Ensure channel structure seems real
978 if ( !i2Validate ( pCh
) ) return -1;
981 // initialize some accelerators and private copies
982 READ_LOCK_IRQSAVE(&pCh
->Ibuf_spinlock
,flags
);
983 count
= pCh
->Ibuf_stuff
- pCh
->Ibuf_strip
;
984 READ_UNLOCK_IRQRESTORE(&pCh
->Ibuf_spinlock
,flags
);
986 // Adjust for buffer wrap
996 //******************************************************************************
997 // Function: i2Output(pCh, pSource, count)
998 // Parameters: Pointer to channel structure
999 // Pointer to source data
1000 // Number of bytes to send
1001 // Returns: Number of bytes sent, or -1 for error
1004 // Queues the data at pSource to be sent as data packets to the board. If there
1005 // is a collosal blunder, (invalid structure pointers or the like), returns -1.
1006 // Otherwise, returns the number of bytes written. What if there is not enough
1007 // room for all the data? If pCh->channelOptions & CO_NBLOCK_WRITE is set, then
1008 // we transfer as many characters as we can now, then return. If this bit is
1009 // clear (default), routine will spin along until all the data is buffered.
1010 // Should this occur, the 1-ms delay routine is called while waiting to avoid
1011 // applications that one cannot break out of.
1012 //******************************************************************************
1014 i2Output(i2ChanStrPtr pCh
, const char *pSource
, int count
)
1017 unsigned char *pInsert
;
1019 int countOriginal
= count
;
1020 unsigned short channel
;
1021 unsigned short stuffIndex
;
1022 unsigned long flags
;
1026 ip2trace (CHANN
, ITRC_OUTPUT
, ITRC_ENTER
, 2, count
, 0 );
1028 // Ensure channel structure seems real
1029 if ( !i2Validate ( pCh
) )
1032 // initialize some accelerators and private copies
1034 channel
= pCh
->infl
.hd
.i2sChannel
;
1036 // If the board has gone fatal, return bad, and also hit the trap routine if
1039 if (pB
->i2eFatalTrap
) {
1040 (*(pB
)->i2eFatalTrap
)(pB
);
1044 // Proceed as though we would do everything
1045 while ( count
> 0 ) {
1047 // How much room in output buffer is there?
1048 READ_LOCK_IRQSAVE(&pCh
->Obuf_spinlock
,flags
);
1049 amountToMove
= pCh
->Obuf_strip
- pCh
->Obuf_stuff
- 1;
1050 READ_UNLOCK_IRQRESTORE(&pCh
->Obuf_spinlock
,flags
);
1051 if (amountToMove
< 0) {
1052 amountToMove
+= OBUF_SIZE
;
1054 // Subtract off the headers size and see how much room there is for real
1055 // data. If this is negative, we will discover later.
1056 amountToMove
-= sizeof (i2DataHeader
);
1058 // Don't move more (now) than can go in a single packet
1059 if ( amountToMove
> (int)(MAX_OBUF_BLOCK
- sizeof(i2DataHeader
)) ) {
1060 amountToMove
= MAX_OBUF_BLOCK
- sizeof(i2DataHeader
);
1062 // Don't move more than the count we were given
1063 if (amountToMove
> count
) {
1064 amountToMove
= count
;
1066 // Now we know how much we must move: NB because the ring buffers have
1067 // an overflow area at the end, we needn't worry about wrapping in the
1068 // middle of a packet.
1070 // Small WINDOW here with no LOCK but I can't call Flush with LOCK
1071 // We would be flushing (or ending flush) anyway
1073 ip2trace (CHANN
, ITRC_OUTPUT
, 10, 1, amountToMove
);
1075 if ( !(pCh
->flush_flags
&& i2RetryFlushOutput(pCh
) )
1076 && amountToMove
> 0 )
1078 WRITE_LOCK_IRQSAVE(&pCh
->Obuf_spinlock
,flags
);
1079 stuffIndex
= pCh
->Obuf_stuff
;
1081 // Had room to move some data: don't know whether the block size,
1082 // buffer space, or what was the limiting factor...
1083 pInsert
= &(pCh
->Obuf
[stuffIndex
]);
1085 // Set up the header
1086 CHANNEL_OF(pInsert
) = channel
;
1087 PTYPE_OF(pInsert
) = PTYPE_DATA
;
1088 TAG_OF(pInsert
) = 0;
1089 ID_OF(pInsert
) = ID_ORDINARY_DATA
;
1090 DATA_COUNT_OF(pInsert
) = amountToMove
;
1093 memcpy( (char*)(DATA_OF(pInsert
)), pSource
, amountToMove
);
1094 // Adjust pointers and indices
1095 pSource
+= amountToMove
;
1096 pCh
->Obuf_char_count
+= amountToMove
;
1097 stuffIndex
+= amountToMove
+ sizeof(i2DataHeader
);
1098 count
-= amountToMove
;
1100 if (stuffIndex
>= OBUF_SIZE
) {
1103 pCh
->Obuf_stuff
= stuffIndex
;
1105 WRITE_UNLOCK_IRQRESTORE(&pCh
->Obuf_spinlock
,flags
);
1107 ip2trace (CHANN
, ITRC_OUTPUT
, 13, 1, stuffIndex
);
1112 // becuz we need to stuff a flush
1113 // or amount to move is <= 0
1115 ip2trace(CHANN
, ITRC_OUTPUT
, 14, 3,
1116 amountToMove
, pB
->i2eFifoRemains
,
1117 pB
->i2eWaitingForEmptyFifo
);
1119 // Put this channel back on queue
1120 // this ultimatly gets more data or wakes write output
1121 i2QueueNeeds(pB
, pCh
, NEED_INLINE
);
1123 if ( pB
->i2eWaitingForEmptyFifo
) {
1125 ip2trace (CHANN
, ITRC_OUTPUT
, 16, 0 );
1128 if (!in_interrupt()) {
1130 ip2trace (CHANN
, ITRC_OUTPUT
, 61, 0 );
1132 schedule_timeout_interruptible(2);
1133 if (signal_pending(current
)) {
1139 ip2trace (CHANN
, ITRC_OUTPUT
, 62, 0 );
1141 // let interrupt in = WAS restore_flags()
1142 // We hold no lock nor is irq off anymore???
1146 break; // from while(count)
1148 else if ( pB
->i2eFifoRemains
< 32 && !pB
->i2eTxMailEmpty ( pB
) )
1150 ip2trace (CHANN
, ITRC_OUTPUT
, 19, 2,
1152 pB
->i2eTxMailEmpty
);
1154 break; // from while(count)
1155 } else if ( pCh
->channelNeeds
& NEED_CREDIT
) {
1157 ip2trace (CHANN
, ITRC_OUTPUT
, 22, 0 );
1159 break; // from while(count)
1160 } else if ( --bailout
) {
1162 // Try to throw more things (maybe not us) in the fifo if we're
1163 // not already waiting for it.
1165 ip2trace (CHANN
, ITRC_OUTPUT
, 20, 0 );
1167 serviceOutgoingFifo(pB
);
1170 ip2trace (CHANN
, ITRC_OUTPUT
, 21, 3,
1172 pB
->i2eOutMailWaiting
,
1173 pB
->i2eWaitingForEmptyFifo
);
1175 break; // from while(count)
1178 } // End of while(count)
1180 i2QueueNeeds(pB
, pCh
, NEED_INLINE
);
1182 // We drop through either when the count expires, or when there is some
1183 // count left, but there was a non-blocking write.
1184 if (countOriginal
> count
) {
1186 ip2trace (CHANN
, ITRC_OUTPUT
, 17, 2, countOriginal
, count
);
1188 serviceOutgoingFifo( pB
);
1191 ip2trace (CHANN
, ITRC_OUTPUT
, ITRC_RETURN
, 2, countOriginal
, count
);
1193 return countOriginal
- count
;
1196 //******************************************************************************
1197 // Function: i2FlushOutput(pCh)
1198 // Parameters: Pointer to a channel structure
1202 // Sends bypass command to start flushing (waiting possibly forever until there
1203 // is room), then sends inline command to stop flushing output, (again waiting
1204 // possibly forever).
1205 //******************************************************************************
1207 i2FlushOutput(i2ChanStrPtr pCh
)
1210 ip2trace (CHANN
, ITRC_FLUSH
, 1, 1, pCh
->flush_flags
);
1212 if (pCh
->flush_flags
)
1215 if ( 1 != i2QueueCommands(PTYPE_BYPASS
, pCh
, 0, 1, CMD_STARTFL
) ) {
1216 pCh
->flush_flags
= STARTFL_FLAG
; // Failed - flag for later
1218 ip2trace (CHANN
, ITRC_FLUSH
, 2, 0 );
1220 } else if ( 1 != i2QueueCommands(PTYPE_INLINE
, pCh
, 0, 1, CMD_STOPFL
) ) {
1221 pCh
->flush_flags
= STOPFL_FLAG
; // Failed - flag for later
1223 ip2trace (CHANN
, ITRC_FLUSH
, 3, 0 );
1228 i2RetryFlushOutput(i2ChanStrPtr pCh
)
1230 int old_flags
= pCh
->flush_flags
;
1232 ip2trace (CHANN
, ITRC_FLUSH
, 14, 1, old_flags
);
1234 pCh
->flush_flags
= 0; // Clear flag so we can avoid recursion
1235 // and queue the commands
1237 if ( old_flags
& STARTFL_FLAG
) {
1238 if ( 1 == i2QueueCommands(PTYPE_BYPASS
, pCh
, 0, 1, CMD_STARTFL
) ) {
1239 old_flags
= STOPFL_FLAG
; //Success - send stop flush
1241 old_flags
= STARTFL_FLAG
; //Failure - Flag for retry later
1244 ip2trace (CHANN
, ITRC_FLUSH
, 15, 1, old_flags
);
1247 if ( old_flags
& STOPFL_FLAG
) {
1248 if (1 == i2QueueCommands(PTYPE_INLINE
, pCh
, 0, 1, CMD_STOPFL
)) {
1249 old_flags
= 0; // Success - clear flags
1252 ip2trace (CHANN
, ITRC_FLUSH
, 16, 1, old_flags
);
1254 pCh
->flush_flags
= old_flags
;
1256 ip2trace (CHANN
, ITRC_FLUSH
, 17, 1, old_flags
);
1261 //******************************************************************************
1262 // Function: i2DrainOutput(pCh,timeout)
1263 // Parameters: Pointer to a channel structure
1264 // Maximum period to wait
1268 // Uses the bookmark request command to ask the board to send a bookmark back as
1269 // soon as all the data is completely sent.
1270 //******************************************************************************
1272 i2DrainWakeup(unsigned long d
)
1274 i2ChanStrPtr pCh
= (i2ChanStrPtr
)d
;
1276 ip2trace (CHANN
, ITRC_DRAIN
, 10, 1, pCh
->BookmarkTimer
.expires
);
1278 pCh
->BookmarkTimer
.expires
= 0;
1279 wake_up_interruptible( &pCh
->pBookmarkWait
);
1283 i2DrainOutput(i2ChanStrPtr pCh
, int timeout
)
1288 ip2trace (CHANN
, ITRC_DRAIN
, ITRC_ENTER
, 1, pCh
->BookmarkTimer
.expires
);
1291 // If the board has gone fatal, return bad,
1292 // and also hit the trap routine if it exists.
1294 if (pB
->i2eFatalTrap
) {
1295 (*(pB
)->i2eFatalTrap
)(pB
);
1299 if ((timeout
> 0) && (pCh
->BookmarkTimer
.expires
== 0 )) {
1300 // One per customer (channel)
1301 setup_timer(&pCh
->BookmarkTimer
, i2DrainWakeup
,
1302 (unsigned long)pCh
);
1304 ip2trace (CHANN
, ITRC_DRAIN
, 1, 1, pCh
->BookmarkTimer
.expires
);
1306 mod_timer(&pCh
->BookmarkTimer
, jiffies
+ timeout
);
1309 i2QueueCommands( PTYPE_INLINE
, pCh
, -1, 1, CMD_BMARK_REQ
);
1311 init_waitqueue_entry(&wait
, current
);
1312 add_wait_queue(&(pCh
->pBookmarkWait
), &wait
);
1313 set_current_state( TASK_INTERRUPTIBLE
);
1315 serviceOutgoingFifo( pB
);
1317 schedule(); // Now we take our interruptible sleep on
1319 // Clean up the queue
1320 set_current_state( TASK_RUNNING
);
1321 remove_wait_queue(&(pCh
->pBookmarkWait
), &wait
);
1323 // if expires == 0 then timer poped, then do not need to del_timer
1324 if ((timeout
> 0) && pCh
->BookmarkTimer
.expires
&&
1325 time_before(jiffies
, pCh
->BookmarkTimer
.expires
)) {
1326 del_timer( &(pCh
->BookmarkTimer
) );
1327 pCh
->BookmarkTimer
.expires
= 0;
1329 ip2trace (CHANN
, ITRC_DRAIN
, 3, 1, pCh
->BookmarkTimer
.expires
);
1332 ip2trace (CHANN
, ITRC_DRAIN
, ITRC_RETURN
, 1, pCh
->BookmarkTimer
.expires
);
1336 //******************************************************************************
1337 // Function: i2OutputFree(pCh)
1338 // Parameters: Pointer to a channel structure
1339 // Returns: Space in output buffer
1342 // Returns -1 if very gross error. Otherwise returns the amount of bytes still
1343 // free in the output buffer.
1344 //******************************************************************************
1346 i2OutputFree(i2ChanStrPtr pCh
)
1349 unsigned long flags
;
1351 // Ensure channel structure seems real
1352 if ( !i2Validate ( pCh
) ) {
1355 READ_LOCK_IRQSAVE(&pCh
->Obuf_spinlock
,flags
);
1356 amountToMove
= pCh
->Obuf_strip
- pCh
->Obuf_stuff
- 1;
1357 READ_UNLOCK_IRQRESTORE(&pCh
->Obuf_spinlock
,flags
);
1359 if (amountToMove
< 0) {
1360 amountToMove
+= OBUF_SIZE
;
1362 // If this is negative, we will discover later
1363 amountToMove
-= sizeof(i2DataHeader
);
1365 return (amountToMove
< 0) ? 0 : amountToMove
;
1373 if (tp
== NULL
) return;
1375 pCh
= tp
->driver_data
;
1377 ip2trace (CHANN
, ITRC_SICMD
, 10, 2, tp
->flags
,
1378 (1 << TTY_DO_WRITE_WAKEUP
) );
1384 set_baud_params(i2eBordStrPtr pB
)
1389 pCh
= (i2ChanStrPtr
*) pB
->i2eChannelPtr
;
1391 for (i
= 0; i
< ABS_MAX_BOXES
; i
++) {
1392 if (pB
->channelBtypes
.bid_value
[i
]) {
1393 if (BID_HAS_654(pB
->channelBtypes
.bid_value
[i
])) {
1394 for (j
= 0; j
< ABS_BIGGEST_BOX
; j
++) {
1395 if (pCh
[i
*16+j
] == NULL
)
1397 (pCh
[i
*16+j
])->BaudBase
= 921600; // MAX for ST654
1398 (pCh
[i
*16+j
])->BaudDivisor
= 96;
1400 } else { // has cirrus cd1400
1401 for (j
= 0; j
< ABS_BIGGEST_BOX
; j
++) {
1402 if (pCh
[i
*16+j
] == NULL
)
1404 (pCh
[i
*16+j
])->BaudBase
= 115200; // MAX for CD1400
1405 (pCh
[i
*16+j
])->BaudDivisor
= 12;
1412 //******************************************************************************
1413 // Function: i2StripFifo(pB)
1414 // Parameters: Pointer to a board structure
1418 // Strips all the available data from the incoming FIFO, identifies the type of
1419 // packet, and either buffers the data or does what needs to be done.
1421 // Note there is no overflow checking here: if the board sends more data than it
1422 // ought to, we will not detect it here, but blindly overflow...
1423 //******************************************************************************
1425 // A buffer for reading in blocks for unknown channels
1426 static unsigned char junkBuffer
[IBUF_SIZE
];
1428 // A buffer to read in a status packet. Because of the size of the count field
1429 // for these things, the maximum packet size must be less than MAX_CMD_PACK_SIZE
1430 static unsigned char cmdBuffer
[MAX_CMD_PACK_SIZE
+ 4];
1432 // This table changes the bit order from MSR order given by STAT_MODEM packet to
1433 // status bits used in our library.
1434 static char xlatDss
[16] = {
1436 0 | 0 | 0 | I2_CTS
,
1437 0 | 0 | I2_DSR
| 0 ,
1438 0 | 0 | I2_DSR
| I2_CTS
,
1440 0 | I2_RI
| 0 | I2_CTS
,
1441 0 | I2_RI
| I2_DSR
| 0 ,
1442 0 | I2_RI
| I2_DSR
| I2_CTS
,
1443 I2_DCD
| 0 | 0 | 0 ,
1444 I2_DCD
| 0 | 0 | I2_CTS
,
1445 I2_DCD
| 0 | I2_DSR
| 0 ,
1446 I2_DCD
| 0 | I2_DSR
| I2_CTS
,
1447 I2_DCD
| I2_RI
| 0 | 0 ,
1448 I2_DCD
| I2_RI
| 0 | I2_CTS
,
1449 I2_DCD
| I2_RI
| I2_DSR
| 0 ,
1450 I2_DCD
| I2_RI
| I2_DSR
| I2_CTS
};
1453 i2StripFifo(i2eBordStrPtr pB
)
1458 unsigned short stuffIndex
;
1460 unsigned char *pc
, *pcLimit
;
1462 unsigned char dss_change
;
1463 unsigned long bflags
,cflags
;
1465 // ip2trace (ITRC_NO_PORT, ITRC_SFIFO, ITRC_ENTER, 0 );
1467 while (HAS_INPUT(pB
)) {
1468 // ip2trace (ITRC_NO_PORT, ITRC_SFIFO, 2, 0 );
1470 // Process packet from fifo a one atomic unit
1471 WRITE_LOCK_IRQSAVE(&pB
->read_fifo_spinlock
,bflags
);
1473 // The first word (or two bytes) will have channel number and type of
1474 // packet, possibly other information
1475 pB
->i2eLeadoffWord
[0] = iiReadWord(pB
);
1477 switch(PTYPE_OF(pB
->i2eLeadoffWord
))
1482 // ip2trace (ITRC_NO_PORT, ITRC_SFIFO, 3, 0 );
1484 channel
= CHANNEL_OF(pB
->i2eLeadoffWord
); /* Store channel */
1485 count
= iiReadWord(pB
); /* Count is in the next word */
1487 // NEW: Check the count for sanity! Should the hardware fail, our death
1488 // is more pleasant. While an oversize channel is acceptable (just more
1489 // than the driver supports), an over-length count clearly means we are
1491 if ( ((unsigned int)count
) > IBUF_SIZE
) {
1493 WRITE_UNLOCK_IRQRESTORE(&pB
->read_fifo_spinlock
,bflags
);
1494 return; /* Bail out ASAP */
1496 // Channel is illegally big ?
1497 if ((channel
>= pB
->i2eChannelCnt
) ||
1498 (NULL
==(pCh
= ((i2ChanStrPtr
*)pB
->i2eChannelPtr
)[channel
])))
1500 iiReadBuf(pB
, junkBuffer
, count
);
1501 WRITE_UNLOCK_IRQRESTORE(&pB
->read_fifo_spinlock
,bflags
);
1502 break; /* From switch: ready for next packet */
1505 // Channel should be valid, then
1507 // If this is a hot-key, merely post its receipt for now. These are
1508 // always supposed to be 1-byte packets, so we won't even check the
1509 // count. Also we will post an acknowledgement to the board so that
1510 // more data can be forthcoming. Note that we are not trying to use
1511 // these sequences in this driver, merely to robustly ignore them.
1512 if(ID_OF(pB
->i2eLeadoffWord
) == ID_HOT_KEY
)
1514 pCh
->hotKeyIn
= iiReadWord(pB
) & 0xff;
1515 WRITE_UNLOCK_IRQRESTORE(&pB
->read_fifo_spinlock
,bflags
);
1516 i2QueueCommands(PTYPE_BYPASS
, pCh
, 0, 1, CMD_HOTACK
);
1517 break; /* From the switch: ready for next packet */
1520 // Normal data! We crudely assume there is room for the data in our
1521 // buffer because the board wouldn't have exceeded his credit limit.
1522 WRITE_LOCK_IRQSAVE(&pCh
->Ibuf_spinlock
,cflags
);
1523 // We have 2 locks now
1524 stuffIndex
= pCh
->Ibuf_stuff
;
1525 amountToRead
= IBUF_SIZE
- stuffIndex
;
1526 if (amountToRead
> count
)
1527 amountToRead
= count
;
1529 // stuffIndex would have been already adjusted so there would
1530 // always be room for at least one, and count is always at least
1533 iiReadBuf(pB
, &(pCh
->Ibuf
[stuffIndex
]), amountToRead
);
1534 pCh
->icount
.rx
+= amountToRead
;
1536 // Update the stuffIndex by the amount of data moved. Note we could
1537 // never ask for more data than would just fit. However, we might
1538 // have read in one more byte than we wanted because the read
1539 // rounds up to even bytes. If this byte is on the end of the
1540 // packet, and is padding, we ignore it. If the byte is part of
1541 // the actual data, we need to move it.
1543 stuffIndex
+= amountToRead
;
1545 if (stuffIndex
>= IBUF_SIZE
) {
1546 if ((amountToRead
& 1) && (count
> amountToRead
)) {
1547 pCh
->Ibuf
[0] = pCh
->Ibuf
[IBUF_SIZE
];
1555 // If there is anything left over, read it as well
1556 if (count
> amountToRead
) {
1557 amountToRead
= count
- amountToRead
;
1558 iiReadBuf(pB
, &(pCh
->Ibuf
[stuffIndex
]), amountToRead
);
1559 pCh
->icount
.rx
+= amountToRead
;
1560 stuffIndex
+= amountToRead
;
1563 // Update stuff index
1564 pCh
->Ibuf_stuff
= stuffIndex
;
1565 WRITE_UNLOCK_IRQRESTORE(&pCh
->Ibuf_spinlock
,cflags
);
1566 WRITE_UNLOCK_IRQRESTORE(&pB
->read_fifo_spinlock
,bflags
);
1569 schedule_work(&pCh
->tqueue_input
);
1571 do_input(&pCh
->tqueue_input
);
1574 // Note we do not need to maintain any flow-control credits at this
1575 // time: if we were to increment .asof and decrement .room, there
1576 // would be no net effect. Instead, when we strip data, we will
1577 // increment .asof and leave .room unchanged.
1579 break; // From switch: ready for next packet
1582 ip2trace (ITRC_NO_PORT
, ITRC_SFIFO
, 4, 0 );
1584 count
= CMD_COUNT_OF(pB
->i2eLeadoffWord
);
1586 iiReadBuf(pB
, cmdBuffer
, count
);
1587 // We can release early with buffer grab
1588 WRITE_UNLOCK_IRQRESTORE(&pB
->read_fifo_spinlock
,bflags
);
1591 pcLimit
= &(cmdBuffer
[count
]);
1593 while (pc
< pcLimit
) {
1596 ip2trace (channel
, ITRC_SFIFO
, 7, 2, channel
, *pc
);
1598 /* check for valid channel */
1599 if (channel
< pB
->i2eChannelCnt
1601 (pCh
= (((i2ChanStrPtr
*)pB
->i2eChannelPtr
)[channel
])) != NULL
1608 /* Breaks and modem signals are easy: just update status */
1610 if ( !(pCh
->dataSetIn
& I2_CTS
) )
1612 pCh
->dataSetIn
|= I2_DCTS
;
1616 pCh
->dataSetIn
|= I2_CTS
;
1620 if ( pCh
->dataSetIn
& I2_CTS
)
1622 pCh
->dataSetIn
|= I2_DCTS
;
1626 pCh
->dataSetIn
&= ~I2_CTS
;
1630 ip2trace (channel
, ITRC_MODEM
, 1, 1, pCh
->dataSetIn
);
1632 if ( !(pCh
->dataSetIn
& I2_DCD
) )
1634 ip2trace (CHANN
, ITRC_MODEM
, 2, 0 );
1635 pCh
->dataSetIn
|= I2_DDCD
;
1639 pCh
->dataSetIn
|= I2_DCD
;
1641 ip2trace (channel
, ITRC_MODEM
, 3, 1, pCh
->dataSetIn
);
1645 ip2trace (channel
, ITRC_MODEM
, 4, 1, pCh
->dataSetIn
);
1646 if ( pCh
->dataSetIn
& I2_DCD
)
1648 ip2trace (channel
, ITRC_MODEM
, 5, 0 );
1649 pCh
->dataSetIn
|= I2_DDCD
;
1653 pCh
->dataSetIn
&= ~I2_DCD
;
1655 ip2trace (channel
, ITRC_MODEM
, 6, 1, pCh
->dataSetIn
);
1659 if ( !(pCh
->dataSetIn
& I2_DSR
) )
1661 pCh
->dataSetIn
|= I2_DDSR
;
1665 pCh
->dataSetIn
|= I2_DSR
;
1669 if ( pCh
->dataSetIn
& I2_DSR
)
1671 pCh
->dataSetIn
|= I2_DDSR
;
1675 pCh
->dataSetIn
&= ~I2_DSR
;
1679 if ( !(pCh
->dataSetIn
& I2_RI
) )
1681 pCh
->dataSetIn
|= I2_DRI
;
1685 pCh
->dataSetIn
|= I2_RI
;
1689 // to be compat with serial.c
1690 //if ( pCh->dataSetIn & I2_RI )
1692 // pCh->dataSetIn |= I2_DRI;
1693 // pCh->icount.rng++;
1696 pCh
->dataSetIn
&= ~I2_RI
;
1700 pCh
->dataSetIn
|= I2_BRK
;
1705 // Bookmarks? one less request we're waiting for
1708 if (pCh
->bookMarks
<= 0 ) {
1710 wake_up_interruptible( &pCh
->pBookmarkWait
);
1712 ip2trace (channel
, ITRC_DRAIN
, 20, 1, pCh
->BookmarkTimer
.expires
);
1716 // Flow control packets? Update the new credits, and if
1717 // someone was waiting for output, queue him up again.
1720 ((flowStatPtr
)pc
)->room
-
1721 (pCh
->outfl
.asof
- ((flowStatPtr
)pc
)->asof
);
1723 ip2trace (channel
, ITRC_STFLW
, 1, 1, pCh
->outfl
.room
);
1725 if (pCh
->channelNeeds
& NEED_CREDIT
)
1727 ip2trace (channel
, ITRC_STFLW
, 2, 1, pCh
->channelNeeds
);
1729 pCh
->channelNeeds
&= ~NEED_CREDIT
;
1730 i2QueueNeeds(pB
, pCh
, NEED_INLINE
);
1732 ip2_owake(pCh
->pTTY
);
1735 ip2trace (channel
, ITRC_STFLW
, 3, 1, pCh
->channelNeeds
);
1737 pc
+= sizeof(flowStat
);
1740 /* Special packets: */
1741 /* Just copy the information into the channel structure */
1745 pCh
->channelStatus
= *((debugStatPtr
)pc
);
1746 pc
+= sizeof(debugStat
);
1751 pCh
->channelTcount
= *((cntStatPtr
)pc
);
1752 pc
+= sizeof(cntStat
);
1757 pCh
->channelRcount
= *((cntStatPtr
)pc
);
1758 pc
+= sizeof(cntStat
);
1762 pB
->channelBtypes
= *((bidStatPtr
)pc
);
1763 pc
+= sizeof(bidStat
);
1764 set_baud_params(pB
);
1768 i2QueueCommands (PTYPE_INLINE
, pCh
, 0, 1, CMD_HW_TEST
);
1769 pCh
->channelFail
= *((failStatPtr
)pc
);
1770 pc
+= sizeof(failStat
);
1773 /* No explicit match? then
1774 * Might be an error packet...
1777 switch (uc
& STAT_MOD_ERROR
)
1780 if (uc
& STAT_E_PARITY
) {
1781 pCh
->dataSetIn
|= I2_PAR
;
1782 pCh
->icount
.parity
++;
1784 if (uc
& STAT_E_FRAMING
){
1785 pCh
->dataSetIn
|= I2_FRA
;
1786 pCh
->icount
.frame
++;
1788 if (uc
& STAT_E_OVERRUN
){
1789 pCh
->dataSetIn
|= I2_OVR
;
1790 pCh
->icount
.overrun
++;
1795 // the answer to DSS_NOW request (not change)
1796 pCh
->dataSetIn
= (pCh
->dataSetIn
1797 & ~(I2_RI
| I2_CTS
| I2_DCD
| I2_DSR
) )
1798 | xlatDss
[uc
& 0xf];
1799 wake_up_interruptible ( &pCh
->dss_now_wait
);
1803 } /* End of switch on status type */
1806 schedule_work(&pCh
->tqueue_status
);
1808 do_status(&pCh
->tqueue_status
);
1812 else /* Or else, channel is invalid */
1814 // Even though the channel is invalid, we must test the
1815 // status to see how much additional data it has (to be
1820 pc
+= 4; /* Skip the data */
1827 } // End of while (there is still some status packet left)
1830 default: // Neither packet? should be impossible
1831 ip2trace (ITRC_NO_PORT
, ITRC_SFIFO
, 5, 1,
1832 PTYPE_OF(pB
->i2eLeadoffWord
) );
1835 } // End of switch on type of packets
1836 } //while(board HAS_INPUT)
1838 ip2trace (ITRC_NO_PORT
, ITRC_SFIFO
, ITRC_RETURN
, 0 );
1840 // Send acknowledgement to the board even if there was no data!
1841 pB
->i2eOutMailWaiting
|= MB_IN_STRIPPED
;
1845 //******************************************************************************
1846 // Function: i2Write2Fifo(pB,address,count)
1847 // Parameters: Pointer to a board structure, source address, byte count
1848 // Returns: bytes written
1851 // Writes count bytes to board io address(implied) from source
1852 // Adjusts count, leaves reserve for next time around bypass cmds
1853 //******************************************************************************
1855 i2Write2Fifo(i2eBordStrPtr pB
, unsigned char *source
, int count
,int reserve
)
1858 unsigned long flags
;
1859 WRITE_LOCK_IRQSAVE(&pB
->write_fifo_spinlock
,flags
);
1860 if (!pB
->i2eWaitingForEmptyFifo
) {
1861 if (pB
->i2eFifoRemains
> (count
+reserve
)) {
1862 pB
->i2eFifoRemains
-= count
;
1863 iiWriteBuf(pB
, source
, count
);
1864 pB
->i2eOutMailWaiting
|= MB_OUT_STUFFED
;
1868 WRITE_UNLOCK_IRQRESTORE(&pB
->write_fifo_spinlock
,flags
);
1871 //******************************************************************************
1872 // Function: i2StuffFifoBypass(pB)
1873 // Parameters: Pointer to a board structure
1877 // Stuffs as many bypass commands into the fifo as possible. This is simpler
1878 // than stuffing data or inline commands to fifo, since we do not have
1879 // flow-control to deal with.
1880 //******************************************************************************
1882 i2StuffFifoBypass(i2eBordStrPtr pB
)
1885 unsigned char *pRemove
;
1886 unsigned short stripIndex
;
1887 unsigned short packetSize
;
1888 unsigned short paddedSize
;
1889 unsigned short notClogged
= 1;
1890 unsigned long flags
;
1894 // Continue processing so long as there are entries, or there is room in the
1895 // fifo. Each entry represents a channel with something to do.
1896 while ( --bailout
&& notClogged
&&
1897 (NULL
!= (pCh
= i2DeQueueNeeds(pB
,NEED_BYPASS
))))
1899 WRITE_LOCK_IRQSAVE(&pCh
->Cbuf_spinlock
,flags
);
1900 stripIndex
= pCh
->Cbuf_strip
;
1902 // as long as there are packets for this channel...
1904 while (stripIndex
!= pCh
->Cbuf_stuff
) {
1905 pRemove
= &(pCh
->Cbuf
[stripIndex
]);
1906 packetSize
= CMD_COUNT_OF(pRemove
) + sizeof(i2CmdHeader
);
1907 paddedSize
= ROUNDUP(packetSize
);
1909 if (paddedSize
> 0) {
1910 if ( 0 == i2Write2Fifo(pB
, pRemove
, paddedSize
,0)) {
1911 notClogged
= 0; /* fifo full */
1912 i2QueueNeeds(pB
, pCh
, NEED_BYPASS
); // Put back on queue
1913 break; // Break from the channel
1917 WriteDBGBuf("BYPS", pRemove
, paddedSize
);
1918 #endif /* DEBUG_FIFO */
1919 pB
->debugBypassCount
++;
1921 pRemove
+= packetSize
;
1922 stripIndex
+= packetSize
;
1923 if (stripIndex
>= CBUF_SIZE
) {
1925 pRemove
= pCh
->Cbuf
;
1928 // Done with this channel. Move to next, removing this one from
1929 // the queue of channels if we cleaned it out (i.e., didn't get clogged.
1930 pCh
->Cbuf_strip
= stripIndex
;
1931 WRITE_UNLOCK_IRQRESTORE(&pCh
->Cbuf_spinlock
,flags
);
1932 } // Either clogged or finished all the work
1934 #ifdef IP2DEBUG_TRACE
1936 ip2trace (ITRC_NO_PORT
, ITRC_ERROR
, 1, 0 );
1941 //******************************************************************************
1942 // Function: i2StuffFifoFlow(pB)
1943 // Parameters: Pointer to a board structure
1947 // Stuffs as many flow control packets into the fifo as possible. This is easier
1948 // even than doing normal bypass commands, because there is always at most one
1949 // packet, already assembled, for each channel.
1950 //******************************************************************************
1952 i2StuffFifoFlow(i2eBordStrPtr pB
)
1955 unsigned short paddedSize
= ROUNDUP(sizeof(flowIn
));
1957 ip2trace (ITRC_NO_PORT
, ITRC_SFLOW
, ITRC_ENTER
, 2,
1958 pB
->i2eFifoRemains
, paddedSize
);
1960 // Continue processing so long as there are entries, or there is room in the
1961 // fifo. Each entry represents a channel with something to do.
1962 while ( (NULL
!= (pCh
= i2DeQueueNeeds(pB
,NEED_FLOW
)))) {
1963 pB
->debugFlowCount
++;
1965 // NO Chan LOCK needed ???
1966 if ( 0 == i2Write2Fifo(pB
,(unsigned char *)&(pCh
->infl
),paddedSize
,0)) {
1970 WriteDBGBuf("FLOW",(unsigned char *) &(pCh
->infl
), paddedSize
);
1971 #endif /* DEBUG_FIFO */
1973 } // Either clogged or finished all the work
1975 ip2trace (ITRC_NO_PORT
, ITRC_SFLOW
, ITRC_RETURN
, 0 );
1978 //******************************************************************************
1979 // Function: i2StuffFifoInline(pB)
1980 // Parameters: Pointer to a board structure
1984 // Stuffs as much data and inline commands into the fifo as possible. This is
1985 // the most complex fifo-stuffing operation, since there if now the channel
1986 // flow-control issue to deal with.
1987 //******************************************************************************
1989 i2StuffFifoInline(i2eBordStrPtr pB
)
1992 unsigned char *pRemove
;
1993 unsigned short stripIndex
;
1994 unsigned short packetSize
;
1995 unsigned short paddedSize
;
1996 unsigned short notClogged
= 1;
1997 unsigned short flowsize
;
1998 unsigned long flags
;
2003 ip2trace (ITRC_NO_PORT
, ITRC_SICMD
, ITRC_ENTER
, 3, pB
->i2eFifoRemains
,
2004 pB
->i2Dbuf_strip
, pB
->i2Dbuf_stuff
);
2006 // Continue processing so long as there are entries, or there is room in the
2007 // fifo. Each entry represents a channel with something to do.
2008 while ( --bailout
&& notClogged
&&
2009 (NULL
!= (pCh
= i2DeQueueNeeds(pB
,NEED_INLINE
))) )
2011 WRITE_LOCK_IRQSAVE(&pCh
->Obuf_spinlock
,flags
);
2012 stripIndex
= pCh
->Obuf_strip
;
2014 ip2trace (CHANN
, ITRC_SICMD
, 3, 2, stripIndex
, pCh
->Obuf_stuff
);
2016 // as long as there are packets for this channel...
2018 while ( --bailout2
&& stripIndex
!= pCh
->Obuf_stuff
) {
2019 pRemove
= &(pCh
->Obuf
[stripIndex
]);
2021 // Must determine whether this be a data or command packet to
2022 // calculate correctly the header size and the amount of
2023 // flow-control credit this type of packet will use.
2024 if (PTYPE_OF(pRemove
) == PTYPE_DATA
) {
2025 flowsize
= DATA_COUNT_OF(pRemove
);
2026 packetSize
= flowsize
+ sizeof(i2DataHeader
);
2028 flowsize
= CMD_COUNT_OF(pRemove
);
2029 packetSize
= flowsize
+ sizeof(i2CmdHeader
);
2031 flowsize
= CREDIT_USAGE(flowsize
);
2032 paddedSize
= ROUNDUP(packetSize
);
2034 ip2trace (CHANN
, ITRC_SICMD
, 4, 2, pB
->i2eFifoRemains
, paddedSize
);
2036 // If we don't have enough credits from the board to send the data,
2037 // flag the channel that we are waiting for flow control credit, and
2038 // break out. This will clean up this channel and remove us from the
2039 // queue of hot things to do.
2041 ip2trace (CHANN
, ITRC_SICMD
, 5, 2, pCh
->outfl
.room
, flowsize
);
2043 if (pCh
->outfl
.room
<= flowsize
) {
2044 // Do Not have the credits to send this packet.
2045 i2QueueNeeds(pB
, pCh
, NEED_CREDIT
);
2047 break; // So to do next channel
2049 if ( (paddedSize
> 0)
2050 && ( 0 == i2Write2Fifo(pB
, pRemove
, paddedSize
, 128))) {
2051 // Do Not have room in fifo to send this packet.
2053 i2QueueNeeds(pB
, pCh
, NEED_INLINE
);
2054 break; // Break from the channel
2057 WriteDBGBuf("DATA", pRemove
, paddedSize
);
2058 #endif /* DEBUG_FIFO */
2059 pB
->debugInlineCount
++;
2061 pCh
->icount
.tx
+= flowsize
;
2062 // Update current credits
2063 pCh
->outfl
.room
-= flowsize
;
2064 pCh
->outfl
.asof
+= flowsize
;
2065 if (PTYPE_OF(pRemove
) == PTYPE_DATA
) {
2066 pCh
->Obuf_char_count
-= DATA_COUNT_OF(pRemove
);
2068 pRemove
+= packetSize
;
2069 stripIndex
+= packetSize
;
2071 ip2trace (CHANN
, ITRC_SICMD
, 6, 2, stripIndex
, pCh
->Obuf_strip
);
2073 if (stripIndex
>= OBUF_SIZE
) {
2075 pRemove
= pCh
->Obuf
;
2077 ip2trace (CHANN
, ITRC_SICMD
, 7, 1, stripIndex
);
2082 ip2trace (CHANN
, ITRC_ERROR
, 3, 0 );
2084 // Done with this channel. Move to next, removing this one from the
2085 // queue of channels if we cleaned it out (i.e., didn't get clogged.
2086 pCh
->Obuf_strip
= stripIndex
;
2087 WRITE_UNLOCK_IRQRESTORE(&pCh
->Obuf_spinlock
,flags
);
2091 ip2trace (CHANN
, ITRC_SICMD
, 8, 0 );
2094 ip2_owake(pCh
->pTTY
);
2097 } // Either clogged or finished all the work
2100 ip2trace (ITRC_NO_PORT
, ITRC_ERROR
, 4, 0 );
2103 ip2trace (ITRC_NO_PORT
, ITRC_SICMD
, ITRC_RETURN
, 1,pB
->i2Dbuf_strip
);
2106 //******************************************************************************
2107 // Function: serviceOutgoingFifo(pB)
2108 // Parameters: Pointer to a board structure
2112 // Helper routine to put data in the outgoing fifo, if we aren't already waiting
2113 // for something to be there. If the fifo has only room for a very little data,
2114 // go head and hit the board with a mailbox hit immediately. Otherwise, it will
2115 // have to happen later in the interrupt processing. Since this routine may be
2116 // called both at interrupt and foreground time, we must turn off interrupts
2117 // during the entire process.
2118 //******************************************************************************
2120 serviceOutgoingFifo(i2eBordStrPtr pB
)
2122 // If we aren't currently waiting for the board to empty our fifo, service
2123 // everything that is pending, in priority order (especially, Bypass before
2125 if ( ! pB
->i2eWaitingForEmptyFifo
)
2127 i2StuffFifoFlow(pB
);
2128 i2StuffFifoBypass(pB
);
2129 i2StuffFifoInline(pB
);
2131 iiSendPendingMail(pB
);
2135 //******************************************************************************
2136 // Function: i2ServiceBoard(pB)
2137 // Parameters: Pointer to a board structure
2141 // Normally this is called from interrupt level, but there is deliberately
2142 // nothing in here specific to being called from interrupt level. All the
2143 // hardware-specific, interrupt-specific things happen at the outer levels.
2145 // For example, a timer interrupt could drive this routine for some sort of
2146 // polled operation. The only requirement is that the programmer deal with any
2147 // atomiticity/concurrency issues that result.
2149 // This routine responds to the board's having sent mailbox information to the
2150 // host (which would normally cause an interrupt). This routine reads the
2151 // incoming mailbox. If there is no data in it, this board did not create the
2152 // interrupt and/or has nothing to be done to it. (Except, if we have been
2153 // waiting to write mailbox data to it, we may do so.
2155 // Based on the value in the mailbox, we may take various actions.
2157 // No checking here of pB validity: after all, it shouldn't have been called by
2158 // the handler unless pB were on the list.
2159 //******************************************************************************
2161 i2ServiceBoard ( i2eBordStrPtr pB
)
2164 unsigned long flags
;
2167 /* This should be atomic because of the way we are called... */
2168 if (NO_MAIL_HERE
== ( inmail
= pB
->i2eStartMail
) ) {
2169 inmail
= iiGetMail(pB
);
2171 pB
->i2eStartMail
= NO_MAIL_HERE
;
2173 ip2trace (ITRC_NO_PORT
, ITRC_INTR
, 2, 1, inmail
);
2175 if (inmail
!= NO_MAIL_HERE
) {
2176 // If the board has gone fatal, nothing to do but hit a bit that will
2177 // alert foreground tasks to protest!
2178 if ( inmail
& MB_FATAL_ERROR
) {
2180 goto exit_i2ServiceBoard
;
2183 /* Assuming no fatal condition, we proceed to do work */
2184 if ( inmail
& MB_IN_STUFFED
) {
2185 pB
->i2eFifoInInts
++;
2186 i2StripFifo(pB
); /* There might be incoming packets */
2189 if (inmail
& MB_OUT_STRIPPED
) {
2190 pB
->i2eFifoOutInts
++;
2191 WRITE_LOCK_IRQSAVE(&pB
->write_fifo_spinlock
,flags
);
2192 pB
->i2eFifoRemains
= pB
->i2eFifoSize
;
2193 pB
->i2eWaitingForEmptyFifo
= 0;
2194 WRITE_UNLOCK_IRQRESTORE(&pB
->write_fifo_spinlock
,flags
);
2196 ip2trace (ITRC_NO_PORT
, ITRC_INTR
, 30, 1, pB
->i2eFifoRemains
);
2199 serviceOutgoingFifo(pB
);
2202 ip2trace (ITRC_NO_PORT
, ITRC_INTR
, 8, 0 );
2204 exit_i2ServiceBoard
: