i2lib.c
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上传日期:2013-02-24
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- /*******************************************************************************
- *
- * (c) 1999 by Computone Corporation
- *
- ********************************************************************************
- *
- *
- * PACKAGE: Linux tty Device Driver for IntelliPort family of multiport
- * serial I/O controllers.
- *
- * DESCRIPTION: High-level interface code for the device driver. Uses the
- * Extremely Low Level Interface Support (i2ellis.c). Provides an
- * interface to the standard loadware, to support drivers or
- * application code. (This is included source code, not a separate
- * compilation module.)
- *
- *******************************************************************************/
- //------------------------------------------------------------------------------
- // Note on Strategy:
- // Once the board has been initialized, it will interrupt us when:
- // 1) It has something in the fifo for us to read (incoming data, flow control
- // packets, or whatever).
- // 2) It has stripped whatever we have sent last time in the FIFO (and
- // consequently is ready for more).
- //
- // Note also that the buffer sizes declared in i2lib.h are VERY SMALL. This
- // worsens performance considerably, but is done so that a great many channels
- // might use only a little memory.
- //------------------------------------------------------------------------------
- //------------------------------------------------------------------------------
- // Revision History:
- //
- // 0.00 - 4/16/91 --- First Draft
- // 0.01 - 4/29/91 --- 1st beta release
- // 0.02 - 6/14/91 --- Changes to allow small model compilation
- // 0.03 - 6/17/91 MAG Break reporting protected from interrupts routines with
- // in-line asm added for moving data to/from ring buffers,
- // replacing a variety of methods used previously.
- // 0.04 - 6/21/91 MAG Initial flow-control packets not queued until
- // i2_enable_interrupts time. Former versions would enqueue
- // them at i2_init_channel time, before we knew how many
- // channels were supposed to exist!
- // 0.05 - 10/12/91 MAG Major changes: works through the ellis.c routines now;
- // supports new 16-bit protocol and expandable boards.
- // - 10/24/91 MAG Most changes in place and stable.
- // 0.06 - 2/20/92 MAG Format of CMD_HOTACK corrected: the command takes no
- // argument.
- // 0.07 -- 3/11/92 MAG Support added to store special packet types at interrupt
- // level (mostly responses to specific commands.)
- // 0.08 -- 3/30/92 MAG Support added for STAT_MODEM packet
- // 0.09 -- 6/24/93 MAG i2Link... needed to update number of boards BEFORE
- // turning on the interrupt.
- // 0.10 -- 6/25/93 MAG To avoid gruesome death from a bad board, we sanity check
- // some incoming.
- //
- // 1.1 - 12/25/96 AKM Linux version.
- // - 10/09/98 DMC Revised Linux version.
- //------------------------------------------------------------------------------
- //************
- //* Includes *
- //************
- #include <linux/sched.h>
- #include "i2lib.h"
- //***********************
- //* Function Prototypes *
- //***********************
- static void i2QueueNeeds(i2eBordStrPtr, i2ChanStrPtr, int);
- static i2ChanStrPtr i2DeQueueNeeds(i2eBordStrPtr, int );
- static void i2StripFifo(i2eBordStrPtr);
- static void i2StuffFifoBypass(i2eBordStrPtr);
- static void i2StuffFifoFlow(i2eBordStrPtr);
- static void i2StuffFifoInline(i2eBordStrPtr);
- static int i2RetryFlushOutput(i2ChanStrPtr);
- // Not a documented part of the library routines (careful...) but the Diagnostic
- // i2diag.c finds them useful to help the throughput in certain limited
- // single-threaded operations.
- static void iiSendPendingMail(i2eBordStrPtr);
- static void serviceOutgoingFifo(i2eBordStrPtr);
- // Functions defined in ip2.c as part of interrupt handling
- static void do_input(i2ChanStrPtr);
- static void do_status(i2ChanStrPtr);
- //***************
- //* Debug Data *
- //***************
- #ifdef DEBUG_FIFO
- unsigned char DBGBuf[0x4000];
- unsigned short I = 0;
- static void
- WriteDBGBuf(char *s, unsigned char *src, unsigned short n )
- {
- char *p = src;
- // XXX: We need a spin lock here if we ever use this again
- while (*s) { // copy label
- DBGBuf[I] = *s++;
- I = I++ & 0x3fff;
- }
- while (n--) { // copy data
- DBGBuf[I] = *p++;
- I = I++ & 0x3fff;
- }
- }
- static void
- fatality(i2eBordStrPtr pB )
- {
- int i;
- for (i=0;i<sizeof(DBGBuf);i++) {
- if ((i%16) == 0)
- printk("n%4x:",i);
- printk("%02x ",DBGBuf[i]);
- }
- printk("n");
- for (i=0;i<sizeof(DBGBuf);i++) {
- if ((i%16) == 0)
- printk("n%4x:",i);
- if (DBGBuf[i] >= ' ' && DBGBuf[i] <= '~') {
- printk(" %c ",DBGBuf[i]);
- } else {
- printk(" . ");
- }
- }
- printk("n");
- printk("Last index %xn",I);
- }
- #endif /* DEBUG_FIFO */
- //********
- //* Code *
- //********
- inline int
- i2Validate ( i2ChanStrPtr pCh )
- {
- //ip2trace(pCh->port_index, ITRC_VERIFY,ITRC_ENTER,2,pCh->validity,
- // (CHANNEL_MAGIC | CHANNEL_SUPPORT));
- return ((pCh->validity & (CHANNEL_MAGIC_BITS | CHANNEL_SUPPORT))
- == (CHANNEL_MAGIC | CHANNEL_SUPPORT));
- }
- //******************************************************************************
- // Function: iiSendPendingMail(pB)
- // Parameters: Pointer to a board structure
- // Returns: Nothing
- //
- // Description:
- // If any outgoing mail bits are set and there is outgoing mailbox is empty,
- // send the mail and clear the bits.
- //******************************************************************************
- static inline void
- iiSendPendingMail(i2eBordStrPtr pB)
- {
- if (pB->i2eOutMailWaiting && (!pB->i2eWaitingForEmptyFifo) )
- {
- if (iiTrySendMail(pB, pB->i2eOutMailWaiting))
- {
- /* If we were already waiting for fifo to empty,
- * or just sent MB_OUT_STUFFED, then we are
- * still waiting for it to empty, until we should
- * receive an MB_IN_STRIPPED from the board.
- */
- pB->i2eWaitingForEmptyFifo |=
- (pB->i2eOutMailWaiting & MB_OUT_STUFFED);
- pB->i2eOutMailWaiting = 0;
- pB->SendPendingRetry = 0;
- } else {
- /* The only time we hit this area is when "iiTrySendMail" has
- failed. That only occurs when the outbound mailbox is
- still busy with the last message. We take a short breather
- to let the board catch up with itself and then try again.
- 16 Retries is the limit - then we got a borked board.
- //|=mhw=|// */
- if( ++pB->SendPendingRetry < 16 ) {
- init_timer( &(pB->SendPendingTimer) );
- pB->SendPendingTimer.expires = jiffies + 1;
- pB->SendPendingTimer.function = (void*)(unsigned long)iiSendPendingMail;
- pB->SendPendingTimer.data = (unsigned long)pB;
- add_timer( &(pB->SendPendingTimer) );
- } else {
- printk( KERN_ERR "IP2: iiSendPendingMail unable to queue outbound mailn" );
- }
- }
- }
- }
- //******************************************************************************
- // Function: i2InitChannels(pB, nChannels, pCh)
- // Parameters: Pointer to Ellis Board structure
- // Number of channels to initialize
- // Pointer to first element in an array of channel structures
- // Returns: Success or failure
- //
- // Description:
- //
- // This function patches pointers, back-pointers, and initializes all the
- // elements in the channel structure array.
- //
- // This should be run after the board structure is initialized, through having
- // loaded the standard loadware (otherwise it complains).
- //
- // In any case, it must be done before any serious work begins initializing the
- // irq's or sending commands...
- //
- //******************************************************************************
- static int
- i2InitChannels ( i2eBordStrPtr pB, int nChannels, i2ChanStrPtr pCh)
- {
- int index, stuffIndex;
- i2ChanStrPtr *ppCh;
-
- if (pB->i2eValid != I2E_MAGIC) {
- COMPLETE(pB, I2EE_BADMAGIC);
- }
- if (pB->i2eState != II_STATE_STDLOADED) {
- COMPLETE(pB, I2EE_BADSTATE);
- }
- LOCK_INIT(&pB->read_fifo_spinlock);
- LOCK_INIT(&pB->write_fifo_spinlock);
- LOCK_INIT(&pB->Dbuf_spinlock);
- LOCK_INIT(&pB->Bbuf_spinlock);
- LOCK_INIT(&pB->Fbuf_spinlock);
-
- // NO LOCK needed yet - this is init
- pB->i2eChannelPtr = pCh;
- pB->i2eChannelCnt = nChannels;
- pB->i2Fbuf_strip = pB->i2Fbuf_stuff = 0;
- pB->i2Dbuf_strip = pB->i2Dbuf_stuff = 0;
- pB->i2Bbuf_strip = pB->i2Bbuf_stuff = 0;
- pB->SendPendingRetry = 0;
- memset ( pCh, 0, sizeof (i2ChanStr) * nChannels );
- for (index = stuffIndex = 0, ppCh = (i2ChanStrPtr *)(pB->i2Fbuf);
- nChannels && index < ABS_MOST_PORTS;
- index++)
- {
- if ( !(pB->i2eChannelMap[index >> 4] & (1 << (index & 0xf)) ) ) {
- continue;
- }
- LOCK_INIT(&pCh->Ibuf_spinlock);
- LOCK_INIT(&pCh->Obuf_spinlock);
- LOCK_INIT(&pCh->Cbuf_spinlock);
- LOCK_INIT(&pCh->Pbuf_spinlock);
- // NO LOCK needed yet - this is init
- // Set up validity flag according to support level
- if (pB->i2eGoodMap[index >> 4] & (1 << (index & 0xf)) ) {
- pCh->validity = CHANNEL_MAGIC | CHANNEL_SUPPORT;
- } else {
- pCh->validity = CHANNEL_MAGIC;
- }
- pCh->pMyBord = pB; /* Back-pointer */
- // Prepare an outgoing flow-control packet to send as soon as the chance
- // occurs.
- if ( pCh->validity & CHANNEL_SUPPORT ) {
- pCh->infl.hd.i2sChannel = index;
- pCh->infl.hd.i2sCount = 5;
- pCh->infl.hd.i2sType = PTYPE_BYPASS;
- pCh->infl.fcmd = 37;
- pCh->infl.asof = 0;
- pCh->infl.room = IBUF_SIZE - 1;
- pCh->whenSendFlow = (IBUF_SIZE/5)*4; // when 80% full
- // The following is similar to calling i2QueueNeeds, except that this
- // is done in longhand, since we are setting up initial conditions on
- // many channels at once.
- pCh->channelNeeds = NEED_FLOW; // Since starting from scratch
- pCh->sinceLastFlow = 0; // No bytes received since last flow
- // control packet was queued
- stuffIndex++;
- *ppCh++ = pCh; // List this channel as needing
- // initial flow control packet sent
- }
- // Don't allow anything to be sent until the status packets come in from
- // the board.
- pCh->outfl.asof = 0;
- pCh->outfl.room = 0;
- // Initialize all the ring buffers
- pCh->Ibuf_stuff = pCh->Ibuf_strip = 0;
- pCh->Obuf_stuff = pCh->Obuf_strip = 0;
- pCh->Cbuf_stuff = pCh->Cbuf_strip = 0;
- memset( &pCh->icount, 0, sizeof (struct async_icount) );
- pCh->hotKeyIn = HOT_CLEAR;
- pCh->channelOptions = 0;
- pCh->bookMarks = 0;
- init_waitqueue_head(&pCh->pBookmarkWait);
- init_waitqueue_head(&pCh->open_wait);
- init_waitqueue_head(&pCh->close_wait);
- init_waitqueue_head(&pCh->delta_msr_wait);
- // Set base and divisor so default custom rate is 9600
- pCh->BaudBase = 921600; // MAX for ST654, changed after we get
- pCh->BaudDivisor = 96; // the boxids (UART types) later
- pCh->dataSetIn = 0;
- pCh->dataSetOut = 0;
- pCh->wopen = 0;
- pCh->throttled = 0;
- pCh->speed = CBR_9600;
- pCh->flags = 0;
- pCh->session = 0;
- pCh->pgrp = 0;
- pCh->ClosingDelay = 5*HZ/10;
- pCh->ClosingWaitTime = 30*HZ;
- // Initialize task queue objects
- pCh->tqueue_input.routine = (void(*)(void*)) do_input;
- pCh->tqueue_input.data = pCh;
- pCh->tqueue_status.routine = (void(*)(void*)) do_status;
- pCh->tqueue_status.data = pCh;
- #ifdef IP2DEBUG_TRACE
- pCh->trace = ip2trace;
- #endif
- ++pCh;
- --nChannels;
- }
- // No need to check for wrap here; this is initialization.
- pB->i2Fbuf_stuff = stuffIndex;
- COMPLETE(pB, I2EE_GOOD);
- }
- //******************************************************************************
- // Function: i2DeQueueNeeds(pB, type)
- // Parameters: Pointer to a board structure
- // type bit map: may include NEED_INLINE, NEED_BYPASS, or NEED_FLOW
- // Returns:
- // Pointer to a channel structure
- //
- // Description: Returns pointer struct of next channel that needs service of
- // the type specified. Otherwise returns a NULL reference.
- //
- //******************************************************************************
- static i2ChanStrPtr
- i2DeQueueNeeds(i2eBordStrPtr pB, int type)
- {
- unsigned short queueIndex;
- unsigned long flags;
- i2ChanStrPtr pCh = NULL;
- switch(type) {
- case NEED_INLINE:
- WRITE_LOCK_IRQSAVE(&pB->Dbuf_spinlock,flags);
- if ( pB->i2Dbuf_stuff != pB->i2Dbuf_strip)
- {
- queueIndex = pB->i2Dbuf_strip;
- pCh = pB->i2Dbuf[queueIndex];
- queueIndex++;
- if (queueIndex >= CH_QUEUE_SIZE) {
- queueIndex = 0;
- }
- pB->i2Dbuf_strip = queueIndex;
- pCh->channelNeeds &= ~NEED_INLINE;
- }
- WRITE_UNLOCK_IRQRESTORE(&pB->Dbuf_spinlock,flags);
- break;
- case NEED_BYPASS:
- WRITE_LOCK_IRQSAVE(&pB->Bbuf_spinlock,flags);
- if (pB->i2Bbuf_stuff != pB->i2Bbuf_strip)
- {
- queueIndex = pB->i2Bbuf_strip;
- pCh = pB->i2Bbuf[queueIndex];
- queueIndex++;
- if (queueIndex >= CH_QUEUE_SIZE) {
- queueIndex = 0;
- }
- pB->i2Bbuf_strip = queueIndex;
- pCh->channelNeeds &= ~NEED_BYPASS;
- }
- WRITE_UNLOCK_IRQRESTORE(&pB->Bbuf_spinlock,flags);
- break;
-
- case NEED_FLOW:
- WRITE_LOCK_IRQSAVE(&pB->Fbuf_spinlock,flags);
- if (pB->i2Fbuf_stuff != pB->i2Fbuf_strip)
- {
- queueIndex = pB->i2Fbuf_strip;
- pCh = pB->i2Fbuf[queueIndex];
- queueIndex++;
- if (queueIndex >= CH_QUEUE_SIZE) {
- queueIndex = 0;
- }
- pB->i2Fbuf_strip = queueIndex;
- pCh->channelNeeds &= ~NEED_FLOW;
- }
- WRITE_UNLOCK_IRQRESTORE(&pB->Fbuf_spinlock,flags);
- break;
- default:
- printk(KERN_ERR "i2DeQueueNeeds called with bad type:%xn",type);
- break;
- }
- return pCh;
- }
- //******************************************************************************
- // Function: i2QueueNeeds(pB, pCh, type)
- // Parameters: Pointer to a board structure
- // Pointer to a channel structure
- // type bit map: may include NEED_INLINE, NEED_BYPASS, or NEED_FLOW
- // Returns: Nothing
- //
- // Description:
- // For each type of need selected, if the given channel is not already in the
- // queue, adds it, and sets the flag indicating it is in the queue.
- //******************************************************************************
- static void
- i2QueueNeeds(i2eBordStrPtr pB, i2ChanStrPtr pCh, int type)
- {
- unsigned short queueIndex;
- unsigned long flags;
- // We turn off all the interrupts during this brief process, since the
- // interrupt-level code might want to put things on the queue as well.
- switch (type) {
- case NEED_INLINE:
- WRITE_LOCK_IRQSAVE(&pB->Dbuf_spinlock,flags);
- if ( !(pCh->channelNeeds & NEED_INLINE) )
- {
- pCh->channelNeeds |= NEED_INLINE;
- queueIndex = pB->i2Dbuf_stuff;
- pB->i2Dbuf[queueIndex++] = pCh;
- if (queueIndex >= CH_QUEUE_SIZE)
- queueIndex = 0;
- pB->i2Dbuf_stuff = queueIndex;
- }
- WRITE_UNLOCK_IRQRESTORE(&pB->Dbuf_spinlock,flags);
- break;
- case NEED_BYPASS:
- WRITE_LOCK_IRQSAVE(&pB->Bbuf_spinlock,flags);
- if ((type & NEED_BYPASS) && !(pCh->channelNeeds & NEED_BYPASS))
- {
- pCh->channelNeeds |= NEED_BYPASS;
- queueIndex = pB->i2Bbuf_stuff;
- pB->i2Bbuf[queueIndex++] = pCh;
- if (queueIndex >= CH_QUEUE_SIZE)
- queueIndex = 0;
- pB->i2Bbuf_stuff = queueIndex;
- }
- WRITE_UNLOCK_IRQRESTORE(&pB->Bbuf_spinlock,flags);
- break;
- case NEED_FLOW:
- WRITE_LOCK_IRQSAVE(&pB->Fbuf_spinlock,flags);
- if ((type & NEED_FLOW) && !(pCh->channelNeeds & NEED_FLOW))
- {
- pCh->channelNeeds |= NEED_FLOW;
- queueIndex = pB->i2Fbuf_stuff;
- pB->i2Fbuf[queueIndex++] = pCh;
- if (queueIndex >= CH_QUEUE_SIZE)
- queueIndex = 0;
- pB->i2Fbuf_stuff = queueIndex;
- }
- WRITE_UNLOCK_IRQRESTORE(&pB->Fbuf_spinlock,flags);
- break;
- case NEED_CREDIT:
- pCh->channelNeeds |= NEED_CREDIT;
- break;
- default:
- printk(KERN_ERR "i2QueueNeeds called with bad type:%xn",type);
- break;
- }
- return;
- }
- //******************************************************************************
- // Function: i2QueueCommands(type, pCh, timeout, nCommands, pCs,...)
- // Parameters: type - PTYPE_BYPASS or PTYPE_INLINE
- // pointer to the channel structure
- // maximum period to wait
- // number of commands (n)
- // n commands
- // Returns: Number of commands sent, or -1 for error
- //
- // get board lock before calling
- //
- // Description:
- // Queues up some commands to be sent to a channel. To send possibly several
- // bypass or inline commands to the given channel. The timeout parameter
- // indicates how many HUNDREDTHS OF SECONDS to wait until there is room:
- // 0 = return immediately if no room, -ive = wait forever, +ive = number of
- // 1/100 seconds to wait. Return values:
- // -1 Some kind of nasty error: bad channel structure or invalid arguments.
- // 0 No room to send all the commands
- // (+) Number of commands sent
- //******************************************************************************
- static int
- i2QueueCommands(int type, i2ChanStrPtr pCh, int timeout, int nCommands,
- cmdSyntaxPtr pCs0,...)
- {
- int totalsize = 0;
- int blocksize;
- int lastended;
- cmdSyntaxPtr *ppCs;
- cmdSyntaxPtr pCs;
- int count;
- int flag;
- i2eBordStrPtr pB;
- unsigned short maxBlock;
- unsigned short maxBuff;
- short bufroom;
- unsigned short stuffIndex;
- unsigned char *pBuf;
- unsigned char *pInsert;
- unsigned char *pDest, *pSource;
- unsigned short channel;
- int cnt;
- unsigned long flags = 0;
- rwlock_t *lock_var_p = NULL;
- // Make sure the channel exists, otherwise do nothing
- if ( !i2Validate ( pCh ) ) {
- return -1;
- }
- ip2trace (CHANN, ITRC_QUEUE, ITRC_ENTER, 0 );
- pB = pCh->pMyBord;
- // Board must also exist, and THE INTERRUPT COMMAND ALREADY SENT
- if (pB->i2eValid != I2E_MAGIC || pB->i2eUsingIrq == IRQ_UNDEFINED) {
- return -2;
- }
- // If the board has gone fatal, return bad, and also hit the trap routine if
- // it exists.
- if (pB->i2eFatal) {
- if ( pB->i2eFatalTrap ) {
- (*(pB)->i2eFatalTrap)(pB);
- }
- return -3;
- }
- // Set up some variables, Which buffers are we using? How big are they?
- switch(type)
- {
- case PTYPE_INLINE:
- flag = INL;
- maxBlock = MAX_OBUF_BLOCK;
- maxBuff = OBUF_SIZE;
- pBuf = pCh->Obuf;
- break;
- case PTYPE_BYPASS:
- flag = BYP;
- maxBlock = MAX_CBUF_BLOCK;
- maxBuff = CBUF_SIZE;
- pBuf = pCh->Cbuf;
- break;
- default:
- return -4;
- }
- // Determine the total size required for all the commands
- totalsize = blocksize = sizeof(i2CmdHeader);
- lastended = 0;
- ppCs = &pCs0;
- for ( count = nCommands; count; count--, ppCs++)
- {
- pCs = *ppCs;
- cnt = pCs->length;
- // Will a new block be needed for this one?
- // Two possible reasons: too
- // big or previous command has to be at the end of a packet.
- if ((blocksize + cnt > maxBlock) || lastended) {
- blocksize = sizeof(i2CmdHeader);
- totalsize += sizeof(i2CmdHeader);
- }
- totalsize += cnt;
- blocksize += cnt;
- // If this command had to end a block, then we will make sure to
- // account for it should there be any more blocks.
- lastended = pCs->flags & END;
- }
- for (;;) {
- // Make sure any pending flush commands go out before we add more data.
- if ( !( pCh->flush_flags && i2RetryFlushOutput( pCh ) ) ) {
- // How much room (this time through) ?
- switch(type) {
- case PTYPE_INLINE:
- lock_var_p = &pCh->Obuf_spinlock;
- WRITE_LOCK_IRQSAVE(lock_var_p,flags);
- stuffIndex = pCh->Obuf_stuff;
- bufroom = pCh->Obuf_strip - stuffIndex;
- break;
- case PTYPE_BYPASS:
- lock_var_p = &pCh->Cbuf_spinlock;
- WRITE_LOCK_IRQSAVE(lock_var_p,flags);
- stuffIndex = pCh->Cbuf_stuff;
- bufroom = pCh->Cbuf_strip - stuffIndex;
- break;
- default:
- return -5;
- }
- if (--bufroom < 0) {
- bufroom += maxBuff;
- }
- ip2trace (CHANN, ITRC_QUEUE, 2, 1, bufroom );
- // Check for overflow
- if (totalsize <= bufroom) {
- // Normal Expected path - We still hold LOCK
- break; /* from for()- Enough room: goto proceed */
- }
- }
- ip2trace (CHANN, ITRC_QUEUE, 3, 1, totalsize );
- // Prepare to wait for buffers to empty
- WRITE_UNLOCK_IRQRESTORE(lock_var_p,flags);
- serviceOutgoingFifo(pB); // Dump what we got
- if (timeout == 0) {
- return 0; // Tired of waiting
- }
- if (timeout > 0)
- timeout--; // So negative values == forever
-
- if (!in_interrupt()) {
- current->state = TASK_INTERRUPTIBLE;
- schedule_timeout(1); // short nap
- } else {
- // we cannot sched/sleep in interrrupt silly
- return 0;
- }
- if (signal_pending(current)) {
- return 0; // Wake up! Time to die!!!
- }
- ip2trace (CHANN, ITRC_QUEUE, 4, 0 );
- } // end of for(;;)
- // At this point we have room and the lock - stick them in.
- channel = pCh->infl.hd.i2sChannel;
- pInsert = &pBuf[stuffIndex]; // Pointer to start of packet
- pDest = CMD_OF(pInsert); // Pointer to start of command
- // When we start counting, the block is the size of the header
- for (blocksize = sizeof(i2CmdHeader), count = nCommands,
- lastended = 0, ppCs = &pCs0;
- count;
- count--, ppCs++)
- {
- pCs = *ppCs; // Points to command protocol structure
- // If this is a bookmark request command, post the fact that a bookmark
- // request is pending. NOTE THIS TRICK ONLY WORKS BECAUSE CMD_BMARK_REQ
- // has no parameters! The more general solution would be to reference
- // pCs->cmd[0].
- if (pCs == CMD_BMARK_REQ) {
- pCh->bookMarks++;
- ip2trace (CHANN, ITRC_DRAIN, 30, 1, pCh->bookMarks );
- }
- cnt = pCs->length;
- // If this command would put us over the maximum block size or
- // if the last command had to be at the end of a block, we end
- // the existing block here and start a new one.
- if ((blocksize + cnt > maxBlock) || lastended) {
- ip2trace (CHANN, ITRC_QUEUE, 5, 0 );
- PTYPE_OF(pInsert) = type;
- CHANNEL_OF(pInsert) = channel;
- // count here does not include the header
- CMD_COUNT_OF(pInsert) = blocksize - sizeof(i2CmdHeader);
- stuffIndex += blocksize;
- if(stuffIndex >= maxBuff) {
- stuffIndex = 0;
- pInsert = pBuf;
- }
- pInsert = &pBuf[stuffIndex]; // Pointer to start of next pkt
- pDest = CMD_OF(pInsert);
- blocksize = sizeof(i2CmdHeader);
- }
- // Now we know there is room for this one in the current block
- blocksize += cnt; // Total bytes in this command
- pSource = pCs->cmd; // Copy the command into the buffer
- while (cnt--) {
- *pDest++ = *pSource++;
- }
- // If this command had to end a block, then we will make sure to account
- // for it should there be any more blocks.
- lastended = pCs->flags & END;
- } // end for
- // Clean up the final block by writing header, etc
- PTYPE_OF(pInsert) = type;
- CHANNEL_OF(pInsert) = channel;
- // count here does not include the header
- CMD_COUNT_OF(pInsert) = blocksize - sizeof(i2CmdHeader);
- stuffIndex += blocksize;
- if(stuffIndex >= maxBuff) {
- stuffIndex = 0;
- pInsert = pBuf;
- }
- // Updates the index, and post the need for service. When adding these to
- // the queue of channels, we turn off the interrupt while doing so,
- // because at interrupt level we might want to push a channel back to the
- // end of the queue.
- switch(type)
- {
- case PTYPE_INLINE:
- pCh->Obuf_stuff = stuffIndex; // Store buffer pointer
- WRITE_UNLOCK_IRQRESTORE(&pCh->Obuf_spinlock,flags);
- pB->debugInlineQueued++;
- // Add the channel pointer to list of channels needing service (first
- // come...), if it's not already there.
- i2QueueNeeds(pB, pCh, NEED_INLINE);
- break;
- case PTYPE_BYPASS:
- pCh->Cbuf_stuff = stuffIndex; // Store buffer pointer
- WRITE_UNLOCK_IRQRESTORE(&pCh->Cbuf_spinlock,flags);
- pB->debugBypassQueued++;
- // Add the channel pointer to list of channels needing service (first
- // come...), if it's not already there.
- i2QueueNeeds(pB, pCh, NEED_BYPASS);
- break;
- }
- ip2trace (CHANN, ITRC_QUEUE, ITRC_RETURN, 1, nCommands );
- return nCommands; // Good status: number of commands sent
- }
- //******************************************************************************
- // Function: i2GetStatus(pCh,resetBits)
- // Parameters: Pointer to a channel structure
- // Bit map of status bits to clear
- // Returns: Bit map of current status bits
- //
- // Description:
- // Returns the state of data set signals, and whether a break has been received,
- // (see i2lib.h for bit-mapped result). resetBits is a bit-map of any status
- // bits to be cleared: I2_BRK, I2_PAR, I2_FRA, I2_OVR,... These are cleared
- // AFTER the condition is passed. If pCh does not point to a valid channel,
- // returns -1 (which would be impossible otherwise.
- //******************************************************************************
- static int
- i2GetStatus(i2ChanStrPtr pCh, int resetBits)
- {
- unsigned short status;
- i2eBordStrPtr pB;
- ip2trace (CHANN, ITRC_STATUS, ITRC_ENTER, 2, pCh->dataSetIn, resetBits );
- // Make sure the channel exists, otherwise do nothing */
- if ( !i2Validate ( pCh ) )
- return -1;
- pB = pCh->pMyBord;
- status = pCh->dataSetIn;
- // Clear any specified error bits: but note that only actual error bits can
- // be cleared, regardless of the value passed.
- if (resetBits)
- {
- pCh->dataSetIn &= ~(resetBits & (I2_BRK | I2_PAR | I2_FRA | I2_OVR));
- pCh->dataSetIn &= ~(I2_DDCD | I2_DCTS | I2_DDSR | I2_DRI);
- }
- ip2trace (CHANN, ITRC_STATUS, ITRC_RETURN, 1, pCh->dataSetIn );
- return status;
- }
- //******************************************************************************
- // Function: i2Input(pChpDest,count)
- // Parameters: Pointer to a channel structure
- // Pointer to data buffer
- // Number of bytes to read
- // Returns: Number of bytes read, or -1 for error
- //
- // Description:
- // Strips data from the input buffer and writes it to pDest. If there is a
- // collosal blunder, (invalid structure pointers or the like), returns -1.
- // Otherwise, returns the number of bytes read.
- //******************************************************************************
- static int
- i2Input(i2ChanStrPtr pCh)
- {
- int amountToMove;
- unsigned short stripIndex;
- int count;
- unsigned long flags = 0;
- ip2trace (CHANN, ITRC_INPUT, ITRC_ENTER, 0);
- // Ensure channel structure seems real
- if ( !i2Validate( pCh ) ) {
- count = -1;
- goto i2Input_exit;
- }
- WRITE_LOCK_IRQSAVE(&pCh->Ibuf_spinlock,flags);
- // initialize some accelerators and private copies
- stripIndex = pCh->Ibuf_strip;
- count = pCh->Ibuf_stuff - stripIndex;
- // If buffer is empty or requested data count was 0, (trivial case) return
- // without any further thought.
- if ( count == 0 ) {
- WRITE_UNLOCK_IRQRESTORE(&pCh->Ibuf_spinlock,flags);
- goto i2Input_exit;
- }
- // Adjust for buffer wrap
- if ( count < 0 ) {
- count += IBUF_SIZE;
- }
- // Don't give more than can be taken by the line discipline
- amountToMove = pCh->pTTY->ldisc.receive_room( pCh->pTTY );
- if (count > amountToMove) {
- count = amountToMove;
- }
- // How much could we copy without a wrap?
- amountToMove = IBUF_SIZE - stripIndex;
- if (amountToMove > count) {
- amountToMove = count;
- }
- // Move the first block
- pCh->pTTY->ldisc.receive_buf( pCh->pTTY,
- &(pCh->Ibuf[stripIndex]), NULL, amountToMove );
- // If we needed to wrap, do the second data move
- if (count > amountToMove) {
- pCh->pTTY->ldisc.receive_buf( pCh->pTTY,
- pCh->Ibuf, NULL, count - amountToMove );
- }
- // Bump and wrap the stripIndex all at once by the amount of data read. This
- // method is good regardless of whether the data was in one or two pieces.
- stripIndex += count;
- if (stripIndex >= IBUF_SIZE) {
- stripIndex -= IBUF_SIZE;
- }
- pCh->Ibuf_strip = stripIndex;
- // Update our flow control information and possibly queue ourselves to send
- // it, depending on how much data has been stripped since the last time a
- // packet was sent.
- pCh->infl.asof += count;
- if ((pCh->sinceLastFlow += count) >= pCh->whenSendFlow) {
- pCh->sinceLastFlow -= pCh->whenSendFlow;
- WRITE_UNLOCK_IRQRESTORE(&pCh->Ibuf_spinlock,flags);
- i2QueueNeeds(pCh->pMyBord, pCh, NEED_FLOW);
- } else {
- WRITE_UNLOCK_IRQRESTORE(&pCh->Ibuf_spinlock,flags);
- }
- i2Input_exit:
- ip2trace (CHANN, ITRC_INPUT, ITRC_RETURN, 1, count);
- return count;
- }
- //******************************************************************************
- // Function: i2InputFlush(pCh)
- // Parameters: Pointer to a channel structure
- // Returns: Number of bytes stripped, or -1 for error
- //
- // Description:
- // Strips any data from the input buffer. If there is a collosal blunder,
- // (invalid structure pointers or the like), returns -1. Otherwise, returns the
- // number of bytes stripped.
- //******************************************************************************
- static int
- i2InputFlush(i2ChanStrPtr pCh)
- {
- int count;
- unsigned long flags;
- // Ensure channel structure seems real
- if ( !i2Validate ( pCh ) )
- return -1;
- ip2trace (CHANN, ITRC_INPUT, 10, 0);
- WRITE_LOCK_IRQSAVE(&pCh->Ibuf_spinlock,flags);
- count = pCh->Ibuf_stuff - pCh->Ibuf_strip;
- // Adjust for buffer wrap
- if (count < 0) {
- count += IBUF_SIZE;
- }
- // Expedient way to zero out the buffer
- pCh->Ibuf_strip = pCh->Ibuf_stuff;
- // Update our flow control information and possibly queue ourselves to send
- // it, depending on how much data has been stripped since the last time a
- // packet was sent.
- pCh->infl.asof += count;
- if ( (pCh->sinceLastFlow += count) >= pCh->whenSendFlow )
- {
- pCh->sinceLastFlow -= pCh->whenSendFlow;
- WRITE_UNLOCK_IRQRESTORE(&pCh->Ibuf_spinlock,flags);
- i2QueueNeeds(pCh->pMyBord, pCh, NEED_FLOW);
- } else {
- WRITE_UNLOCK_IRQRESTORE(&pCh->Ibuf_spinlock,flags);
- }
- ip2trace (CHANN, ITRC_INPUT, 19, 1, count);
- return count;
- }
- //******************************************************************************
- // Function: i2InputAvailable(pCh)
- // Parameters: Pointer to a channel structure
- // Returns: Number of bytes available, or -1 for error
- //
- // Description:
- // If there is a collosal blunder, (invalid structure pointers or the like),
- // returns -1. Otherwise, returns the number of bytes stripped. Otherwise,
- // returns the number of bytes available in the buffer.
- //******************************************************************************
- #if 0
- static int
- i2InputAvailable(i2ChanStrPtr pCh)
- {
- int count;
- // Ensure channel structure seems real
- if ( !i2Validate ( pCh ) ) return -1;
- // initialize some accelerators and private copies
- READ_LOCK_IRQSAVE(&pCh->Ibuf_spinlock,flags);
- count = pCh->Ibuf_stuff - pCh->Ibuf_strip;
- READ_UNLOCK_IRQRESTORE(&pCh->Ibuf_spinlock,flags);
- // Adjust for buffer wrap
- if (count < 0)
- {
- count += IBUF_SIZE;
- }
- return count;
- }
- #endif
- //******************************************************************************
- // Function: i2Output(pCh, pSource, count)
- // Parameters: Pointer to channel structure
- // Pointer to source data
- // Number of bytes to send
- // Returns: Number of bytes sent, or -1 for error
- //
- // Description:
- // Queues the data at pSource to be sent as data packets to the board. If there
- // is a collosal blunder, (invalid structure pointers or the like), returns -1.
- // Otherwise, returns the number of bytes written. What if there is not enough
- // room for all the data? If pCh->channelOptions & CO_NBLOCK_WRITE is set, then
- // we transfer as many characters as we can now, then return. If this bit is
- // clear (default), routine will spin along until all the data is buffered.
- // Should this occur, the 1-ms delay routine is called while waiting to avoid
- // applications that one cannot break out of.
- //******************************************************************************
- static int
- i2Output(i2ChanStrPtr pCh, const char *pSource, int count, int user )
- {
- i2eBordStrPtr pB;
- unsigned char *pInsert;
- int amountToMove;
- int countOriginal = count;
- unsigned short channel;
- unsigned short stuffIndex;
- unsigned long flags;
- int rc = 0;
- int bailout = 10;
- ip2trace (CHANN, ITRC_OUTPUT, ITRC_ENTER, 2, count, user );
- // Ensure channel structure seems real
- if ( !i2Validate ( pCh ) )
- return -1;
- // initialize some accelerators and private copies
- pB = pCh->pMyBord;
- channel = pCh->infl.hd.i2sChannel;
- // If the board has gone fatal, return bad, and also hit the trap routine if
- // it exists.
- if (pB->i2eFatal) {
- if (pB->i2eFatalTrap) {
- (*(pB)->i2eFatalTrap)(pB);
- }
- return -1;
- }
- // Proceed as though we would do everything
- while ( count > 0 ) {
- // How much room in output buffer is there?
- READ_LOCK_IRQSAVE(&pCh->Obuf_spinlock,flags);
- amountToMove = pCh->Obuf_strip - pCh->Obuf_stuff - 1;
- READ_UNLOCK_IRQRESTORE(&pCh->Obuf_spinlock,flags);
- if (amountToMove < 0) {
- amountToMove += OBUF_SIZE;
- }
- // Subtract off the headers size and see how much room there is for real
- // data. If this is negative, we will discover later.
- amountToMove -= sizeof (i2DataHeader);
- // Don't move more (now) than can go in a single packet
- if ( amountToMove > (int)(MAX_OBUF_BLOCK - sizeof(i2DataHeader)) ) {
- amountToMove = MAX_OBUF_BLOCK - sizeof(i2DataHeader);
- }
- // Don't move more than the count we were given
- if (amountToMove > count) {
- amountToMove = count;
- }
- // Now we know how much we must move: NB because the ring buffers have
- // an overflow area at the end, we needn't worry about wrapping in the
- // middle of a packet.
- // Small WINDOW here with no LOCK but I can't call Flush with LOCK
- // We would be flushing (or ending flush) anyway
- ip2trace (CHANN, ITRC_OUTPUT, 10, 1, amountToMove );
- if ( !(pCh->flush_flags && i2RetryFlushOutput(pCh) )
- && amountToMove > 0 )
- {
- WRITE_LOCK_IRQSAVE(&pCh->Obuf_spinlock,flags);
- stuffIndex = pCh->Obuf_stuff;
-
- // Had room to move some data: don't know whether the block size,
- // buffer space, or what was the limiting factor...
- pInsert = &(pCh->Obuf[stuffIndex]);
- // Set up the header
- CHANNEL_OF(pInsert) = channel;
- PTYPE_OF(pInsert) = PTYPE_DATA;
- TAG_OF(pInsert) = 0;
- ID_OF(pInsert) = ID_ORDINARY_DATA;
- DATA_COUNT_OF(pInsert) = amountToMove;
- // Move the data
- if ( user ) {
- COPY_FROM_USER(rc, (char*)(DATA_OF(pInsert)), pSource,
- amountToMove );
- } else {
- memcpy( (char*)(DATA_OF(pInsert)), pSource, amountToMove );
- }
- // Adjust pointers and indices
- pSource += amountToMove;
- pCh->Obuf_char_count += amountToMove;
- stuffIndex += amountToMove + sizeof(i2DataHeader);
- count -= amountToMove;
- if (stuffIndex >= OBUF_SIZE) {
- stuffIndex = 0;
- }
- pCh->Obuf_stuff = stuffIndex;
- WRITE_UNLOCK_IRQRESTORE(&pCh->Obuf_spinlock,flags);
- ip2trace (CHANN, ITRC_OUTPUT, 13, 1, stuffIndex );
- } else {
- // Cannot move data
- // becuz we need to stuff a flush
- // or amount to move is <= 0
- ip2trace(CHANN, ITRC_OUTPUT, 14, 3,
- amountToMove, pB->i2eFifoRemains,
- pB->i2eWaitingForEmptyFifo );
- // Put this channel back on queue
- // this ultimatly gets more data or wakes write output
- i2QueueNeeds(pB, pCh, NEED_INLINE);
- if ( pB->i2eWaitingForEmptyFifo ) {
- ip2trace (CHANN, ITRC_OUTPUT, 16, 0 );
- // or schedule
- if (!in_interrupt()) {
- ip2trace (CHANN, ITRC_OUTPUT, 61, 0 );
- current->state = TASK_INTERRUPTIBLE;
- schedule_timeout(2);
- if (signal_pending(current)) {
- break;
- }
- continue;
- } else {
- ip2trace (CHANN, ITRC_OUTPUT, 62, 0 );
- // let interrupt in = WAS restore_flags()
- // We hold no lock nor is irq off anymore???
-
- break;
- }
- break; // from while(count)
- }
- else if ( pB->i2eFifoRemains < 32 && !pB->i2eTxMailEmpty ( pB ) )
- {
- ip2trace (CHANN, ITRC_OUTPUT, 19, 2,
- pB->i2eFifoRemains,
- pB->i2eTxMailEmpty );
- break; // from while(count)
- } else if ( pCh->channelNeeds & NEED_CREDIT ) {
- ip2trace (CHANN, ITRC_OUTPUT, 22, 0 );
- break; // from while(count)
- } else if ( --bailout) {
- // Try to throw more things (maybe not us) in the fifo if we're
- // not already waiting for it.
-
- ip2trace (CHANN, ITRC_OUTPUT, 20, 0 );
- serviceOutgoingFifo(pB);
- //break; CONTINUE;
- } else {
- ip2trace (CHANN, ITRC_OUTPUT, 21, 3,
- pB->i2eFifoRemains,
- pB->i2eOutMailWaiting,
- pB->i2eWaitingForEmptyFifo );
- break; // from while(count)
- }
- }
- } // End of while(count)
- i2QueueNeeds(pB, pCh, NEED_INLINE);
- // We drop through either when the count expires, or when there is some
- // count left, but there was a non-blocking write.
- if (countOriginal > count) {
- ip2trace (CHANN, ITRC_OUTPUT, 17, 2, countOriginal, count );
- serviceOutgoingFifo( pB );
- }
- ip2trace (CHANN, ITRC_OUTPUT, ITRC_RETURN, 2, countOriginal, count );
- return countOriginal - count;
- }
- //******************************************************************************
- // Function: i2FlushOutput(pCh)
- // Parameters: Pointer to a channel structure
- // Returns: Nothing
- //
- // Description:
- // Sends bypass command to start flushing (waiting possibly forever until there
- // is room), then sends inline command to stop flushing output, (again waiting
- // possibly forever).
- //******************************************************************************
- static inline void
- i2FlushOutput(i2ChanStrPtr pCh)
- {
- ip2trace (CHANN, ITRC_FLUSH, 1, 1, pCh->flush_flags );
- if (pCh->flush_flags)
- return;
- if ( 1 != i2QueueCommands(PTYPE_BYPASS, pCh, 0, 1, CMD_STARTFL) ) {
- pCh->flush_flags = STARTFL_FLAG; // Failed - flag for later
- ip2trace (CHANN, ITRC_FLUSH, 2, 0 );
- } else if ( 1 != i2QueueCommands(PTYPE_INLINE, pCh, 0, 1, CMD_STOPFL) ) {
- pCh->flush_flags = STOPFL_FLAG; // Failed - flag for later
- ip2trace (CHANN, ITRC_FLUSH, 3, 0 );
- }
- }
- static int
- i2RetryFlushOutput(i2ChanStrPtr pCh)
- {
- int old_flags = pCh->flush_flags;
- ip2trace (CHANN, ITRC_FLUSH, 14, 1, old_flags );
- pCh->flush_flags = 0; // Clear flag so we can avoid recursion
- // and queue the commands
- if ( old_flags & STARTFL_FLAG ) {
- if ( 1 == i2QueueCommands(PTYPE_BYPASS, pCh, 0, 1, CMD_STARTFL) ) {
- old_flags = STOPFL_FLAG; //Success - send stop flush
- } else {
- old_flags = STARTFL_FLAG; //Failure - Flag for retry later
- }
- ip2trace (CHANN, ITRC_FLUSH, 15, 1, old_flags );
- }
- if ( old_flags & STOPFL_FLAG ) {
- if ( 1 == i2QueueCommands(PTYPE_INLINE, pCh, 0, 1, CMD_STOPFL) > 0 ) {
- old_flags = 0; // Success - clear flags
- }
- ip2trace (CHANN, ITRC_FLUSH, 16, 1, old_flags );
- }
- pCh->flush_flags = old_flags;
- ip2trace (CHANN, ITRC_FLUSH, 17, 1, old_flags );
- return old_flags;
- }
- //******************************************************************************
- // Function: i2DrainOutput(pCh,timeout)
- // Parameters: Pointer to a channel structure
- // Maximum period to wait
- // Returns: ?
- //
- // Description:
- // Uses the bookmark request command to ask the board to send a bookmark back as
- // soon as all the data is completely sent.
- //******************************************************************************
- static void
- i2DrainWakeup(i2ChanStrPtr pCh)
- {
- ip2trace (CHANN, ITRC_DRAIN, 10, 1, pCh->BookmarkTimer.expires );
- pCh->BookmarkTimer.expires = 0;
- wake_up_interruptible( &pCh->pBookmarkWait );
- }
- static void
- i2DrainOutput(i2ChanStrPtr pCh, int timeout)
- {
- wait_queue_t wait;
- i2eBordStrPtr pB;
- ip2trace (CHANN, ITRC_DRAIN, ITRC_ENTER, 1, pCh->BookmarkTimer.expires);
- pB = pCh->pMyBord;
- // If the board has gone fatal, return bad,
- // and also hit the trap routine if it exists.
- if (pB->i2eFatal) {
- if (pB->i2eFatalTrap) {
- (*(pB)->i2eFatalTrap)(pB);
- }
- return;
- }
- if ((timeout > 0) && (pCh->BookmarkTimer.expires == 0 )) {
- // One per customer (channel)
- init_timer( &(pCh->BookmarkTimer) );
- pCh->BookmarkTimer.expires = jiffies + timeout;
- pCh->BookmarkTimer.function = (void*)(unsigned long)i2DrainWakeup;
- pCh->BookmarkTimer.data = (unsigned long)pCh;
- ip2trace (CHANN, ITRC_DRAIN, 1, 1, pCh->BookmarkTimer.expires );
- add_timer( &(pCh->BookmarkTimer) );
- }
-
- i2QueueCommands( PTYPE_INLINE, pCh, -1, 1, CMD_BMARK_REQ );
- init_waitqueue_entry(&wait, current);
- add_wait_queue(&(pCh->pBookmarkWait), &wait);
- set_current_state( TASK_INTERRUPTIBLE );
- serviceOutgoingFifo( pB );
-
- schedule(); // Now we take our interruptible sleep on
- // Clean up the queue
- set_current_state( TASK_RUNNING );
- remove_wait_queue(&(pCh->pBookmarkWait), &wait);
- // if expires == 0 then timer poped, then do not need to del_timer
- if ((timeout > 0) && pCh->BookmarkTimer.expires &&
- (pCh->BookmarkTimer.expires > jiffies)) {
- del_timer( &(pCh->BookmarkTimer) );
- pCh->BookmarkTimer.expires = 0;
- ip2trace (CHANN, ITRC_DRAIN, 3, 1, pCh->BookmarkTimer.expires );
- }
- ip2trace (CHANN, ITRC_DRAIN, ITRC_RETURN, 1, pCh->BookmarkTimer.expires );
- return;
- }
- //******************************************************************************
- // Function: i2OutputFree(pCh)
- // Parameters: Pointer to a channel structure
- // Returns: Space in output buffer
- //
- // Description:
- // Returns -1 if very gross error. Otherwise returns the amount of bytes still
- // free in the output buffer.
- //******************************************************************************
- static int
- i2OutputFree(i2ChanStrPtr pCh)
- {
- int amountToMove;
- unsigned long flags;
- // Ensure channel structure seems real
- if ( !i2Validate ( pCh ) ) {
- return -1;
- }
- READ_LOCK_IRQSAVE(&pCh->Obuf_spinlock,flags);
- amountToMove = pCh->Obuf_strip - pCh->Obuf_stuff - 1;
- READ_UNLOCK_IRQRESTORE(&pCh->Obuf_spinlock,flags);
- if (amountToMove < 0) {
- amountToMove += OBUF_SIZE;
- }
- // If this is negative, we will discover later
- amountToMove -= sizeof(i2DataHeader);
- return (amountToMove < 0) ? 0 : amountToMove;
- }
- static void
- ip2_owake( PTTY tp)
- {
- i2ChanStrPtr pCh;
- if (tp == NULL) return;
- pCh = tp->driver_data;
- ip2trace (CHANN, ITRC_SICMD, 10, 2, tp->flags,
- (1 << TTY_DO_WRITE_WAKEUP) );
- wake_up_interruptible ( &tp->write_wait );
- if ( ( tp->flags & (1 << TTY_DO_WRITE_WAKEUP) )
- && tp->ldisc.write_wakeup )
- {
- (tp->ldisc.write_wakeup) ( tp );
- ip2trace (CHANN, ITRC_SICMD, 11, 0 );
- }
- }
- static inline void
- set_baud_params(i2eBordStrPtr pB)
- {
- int i,j;
- i2ChanStrPtr *pCh;
- pCh = (i2ChanStrPtr *) pB->i2eChannelPtr;
- for (i = 0; i < ABS_MAX_BOXES; i++) {
- if (pB->channelBtypes.bid_value[i]) {
- if (BID_HAS_654(pB->channelBtypes.bid_value[i])) {
- for (j = 0; j < ABS_BIGGEST_BOX; j++) {
- if (pCh[i*16+j] == NULL)
- break;
- (pCh[i*16+j])->BaudBase = 921600; // MAX for ST654
- (pCh[i*16+j])->BaudDivisor = 96;
- }
- } else { // has cirrus cd1400
- for (j = 0; j < ABS_BIGGEST_BOX; j++) {
- if (pCh[i*16+j] == NULL)
- break;
- (pCh[i*16+j])->BaudBase = 115200; // MAX for CD1400
- (pCh[i*16+j])->BaudDivisor = 12;
- }
- }
- }
- }
- }
- //******************************************************************************
- // Function: i2StripFifo(pB)
- // Parameters: Pointer to a board structure
- // Returns: ?
- //
- // Description:
- // Strips all the available data from the incoming FIFO, identifies the type of
- // packet, and either buffers the data or does what needs to be done.
- //
- // Note there is no overflow checking here: if the board sends more data than it
- // ought to, we will not detect it here, but blindly overflow...
- //******************************************************************************
- // A buffer for reading in blocks for unknown channels
- static unsigned char junkBuffer[IBUF_SIZE];
- // A buffer to read in a status packet. Because of the size of the count field
- // for these things, the maximum packet size must be less than MAX_CMD_PACK_SIZE
- static unsigned char cmdBuffer[MAX_CMD_PACK_SIZE + 4];
- // This table changes the bit order from MSR order given by STAT_MODEM packet to
- // status bits used in our library.
- static char xlatDss[16] = {
- 0 | 0 | 0 | 0 ,
- 0 | 0 | 0 | I2_CTS ,
- 0 | 0 | I2_DSR | 0 ,
- 0 | 0 | I2_DSR | I2_CTS ,
- 0 | I2_RI | 0 | 0 ,
- 0 | I2_RI | 0 | I2_CTS ,
- 0 | I2_RI | I2_DSR | 0 ,
- 0 | I2_RI | I2_DSR | I2_CTS ,
- I2_DCD | 0 | 0 | 0 ,
- I2_DCD | 0 | 0 | I2_CTS ,
- I2_DCD | 0 | I2_DSR | 0 ,
- I2_DCD | 0 | I2_DSR | I2_CTS ,
- I2_DCD | I2_RI | 0 | 0 ,
- I2_DCD | I2_RI | 0 | I2_CTS ,
- I2_DCD | I2_RI | I2_DSR | 0 ,
- I2_DCD | I2_RI | I2_DSR | I2_CTS };
- static inline void
- i2StripFifo(i2eBordStrPtr pB)
- {
- i2ChanStrPtr pCh;
- int channel;
- int count;
- unsigned short stuffIndex;
- int amountToRead;
- unsigned char *pc, *pcLimit;
- unsigned char uc;
- unsigned char dss_change;
- unsigned long bflags,cflags;
- // ip2trace (ITRC_NO_PORT, ITRC_SFIFO, ITRC_ENTER, 0 );
- while (HAS_INPUT(pB)) {
- // ip2trace (ITRC_NO_PORT, ITRC_SFIFO, 2, 0 );
- // Process packet from fifo a one atomic unit
- WRITE_LOCK_IRQSAVE(&pB->read_fifo_spinlock,bflags);
-
- // The first word (or two bytes) will have channel number and type of
- // packet, possibly other information
- pB->i2eLeadoffWord[0] = iiReadWord(pB);
- switch(PTYPE_OF(pB->i2eLeadoffWord))
- {
- case PTYPE_DATA:
- pB->got_input = 1;
- // ip2trace (ITRC_NO_PORT, ITRC_SFIFO, 3, 0 );
- channel = CHANNEL_OF(pB->i2eLeadoffWord); /* Store channel */
- count = iiReadWord(pB); /* Count is in the next word */
- // NEW: Check the count for sanity! Should the hardware fail, our death
- // is more pleasant. While an oversize channel is acceptable (just more
- // than the driver supports), an over-length count clearly means we are
- // sick!
- if ( ((unsigned int)count) > IBUF_SIZE ) {
- pB->i2eFatal = 2;
- WRITE_UNLOCK_IRQRESTORE(&pB->read_fifo_spinlock,bflags);
- return; /* Bail out ASAP */
- }
- // Channel is illegally big ?
- if ((channel >= pB->i2eChannelCnt) ||
- (NULL==(pCh = ((i2ChanStrPtr*)pB->i2eChannelPtr)[channel])))
- {
- iiReadBuf(pB, junkBuffer, count);
- WRITE_UNLOCK_IRQRESTORE(&pB->read_fifo_spinlock,bflags);
- break; /* From switch: ready for next packet */
- }
- // Channel should be valid, then
- // If this is a hot-key, merely post its receipt for now. These are
- // always supposed to be 1-byte packets, so we won't even check the
- // count. Also we will post an acknowledgement to the board so that
- // more data can be forthcoming. Note that we are not trying to use
- // these sequences in this driver, merely to robustly ignore them.
- if(ID_OF(pB->i2eLeadoffWord) == ID_HOT_KEY)
- {
- pCh->hotKeyIn = iiReadWord(pB) & 0xff;
- WRITE_UNLOCK_IRQRESTORE(&pB->read_fifo_spinlock,bflags);
- i2QueueCommands(PTYPE_BYPASS, pCh, 0, 1, CMD_HOTACK);
- break; /* From the switch: ready for next packet */
- }
- // Normal data! We crudely assume there is room for the data in our
- // buffer because the board wouldn't have exceeded his credit limit.
- WRITE_LOCK_IRQSAVE(&pCh->Ibuf_spinlock,cflags);
- // We have 2 locks now
- stuffIndex = pCh->Ibuf_stuff;
- amountToRead = IBUF_SIZE - stuffIndex;
- if (amountToRead > count)
- amountToRead = count;
- // stuffIndex would have been already adjusted so there would
- // always be room for at least one, and count is always at least
- // one.
- iiReadBuf(pB, &(pCh->Ibuf[stuffIndex]), amountToRead);
- pCh->icount.rx += amountToRead;
- // Update the stuffIndex by the amount of data moved. Note we could
- // never ask for more data than would just fit. However, we might
- // have read in one more byte than we wanted because the read
- // rounds up to even bytes. If this byte is on the end of the
- // packet, and is padding, we ignore it. If the byte is part of
- // the actual data, we need to move it.
- stuffIndex += amountToRead;
- if (stuffIndex >= IBUF_SIZE) {
- if ((amountToRead & 1) && (count > amountToRead)) {
- pCh->Ibuf[0] = pCh->Ibuf[IBUF_SIZE];
- amountToRead++;
- stuffIndex = 1;
- } else {
- stuffIndex = 0;
- }
- }
- // If there is anything left over, read it as well
- if (count > amountToRead) {
- amountToRead = count - amountToRead;
- iiReadBuf(pB, &(pCh->Ibuf[stuffIndex]), amountToRead);
- pCh->icount.rx += amountToRead;
- stuffIndex += amountToRead;
- }
- // Update stuff index
- pCh->Ibuf_stuff = stuffIndex;
- WRITE_UNLOCK_IRQRESTORE(&pCh->Ibuf_spinlock,cflags);
- WRITE_UNLOCK_IRQRESTORE(&pB->read_fifo_spinlock,bflags);
- #ifdef USE_IQ
- queue_task(&pCh->tqueue_input, &tq_immediate);
- mark_bh(IMMEDIATE_BH);
- #else
- do_input(pCh);
- #endif
- // Note we do not need to maintain any flow-control credits at this
- // time: if we were to increment .asof and decrement .room, there
- // would be no net effect. Instead, when we strip data, we will
- // increment .asof and leave .room unchanged.
- break; // From switch: ready for next packet
- case PTYPE_STATUS:
- ip2trace (ITRC_NO_PORT, ITRC_SFIFO, 4, 0 );
-
- count = CMD_COUNT_OF(pB->i2eLeadoffWord);
- iiReadBuf(pB, cmdBuffer, count);
- // We can release early with buffer grab
- WRITE_UNLOCK_IRQRESTORE(&pB->read_fifo_spinlock,bflags);
- pc = cmdBuffer;
- pcLimit = &(cmdBuffer[count]);
- while (pc < pcLimit) {
- channel = *pc++;
- ip2trace (channel, ITRC_SFIFO, 7, 2, channel, *pc );
- /* check for valid channel */
- if (channel < pB->i2eChannelCnt
- &&
- (pCh = (((i2ChanStrPtr*)pB->i2eChannelPtr)[channel])) != NULL
- )
- {
- dss_change = 0;
- switch (uc = *pc++)
- {
- /* Breaks and modem signals are easy: just update status */
- case STAT_CTS_UP:
- if ( !(pCh->dataSetIn & I2_CTS) )
- {
- pCh->dataSetIn |= I2_DCTS;
- pCh->icount.cts++;
- dss_change = 1;
- }
- pCh->dataSetIn |= I2_CTS;
- break;
- case STAT_CTS_DN:
- if ( pCh->dataSetIn & I2_CTS )
- {
- pCh->dataSetIn |= I2_DCTS;
- pCh->icount.cts++;
- dss_change = 1;
- }
- pCh->dataSetIn &= ~I2_CTS;
- break;
- case STAT_DCD_UP:
- ip2trace (channel, ITRC_MODEM, 1, 1, pCh->dataSetIn );
- if ( !(pCh->dataSetIn & I2_DCD) )
- {
- ip2trace (CHANN, ITRC_MODEM, 2, 0 );
- pCh->dataSetIn |= I2_DDCD;
- pCh->icount.dcd++;
- dss_change = 1;
- }
- pCh->dataSetIn |= I2_DCD;
- ip2trace (channel, ITRC_MODEM, 3, 1, pCh->dataSetIn );
- break;
- case STAT_DCD_DN:
- ip2trace (channel, ITRC_MODEM, 4, 1, pCh->dataSetIn );
- if ( pCh->dataSetIn & I2_DCD )
- {
- ip2trace (channel, ITRC_MODEM, 5, 0 );
- pCh->dataSetIn |= I2_DDCD;
- pCh->icount.dcd++;
- dss_change = 1;
- }
- pCh->dataSetIn &= ~I2_DCD;
- ip2trace (channel, ITRC_MODEM, 6, 1, pCh->dataSetIn );
- break;
- case STAT_DSR_UP:
- if ( !(pCh->dataSetIn & I2_DSR) )
- {
- pCh->dataSetIn |= I2_DDSR;
- pCh->icount.dsr++;
- dss_change = 1;
- }
- pCh->dataSetIn |= I2_DSR;
- break;
- case STAT_DSR_DN:
- if ( pCh->dataSetIn & I2_DSR )
- {
- pCh->dataSetIn |= I2_DDSR;
- pCh->icount.dsr++;
- dss_change = 1;
- }
- pCh->dataSetIn &= ~I2_DSR;
- break;
- case STAT_RI_UP:
- if ( !(pCh->dataSetIn & I2_RI) )
- {
- pCh->dataSetIn |= I2_DRI;
- pCh->icount.rng++;
- dss_change = 1;
- }
- pCh->dataSetIn |= I2_RI ;
- break;
- case STAT_RI_DN:
- // to be compat with serial.c
- //if ( pCh->dataSetIn & I2_RI )
- //{
- // pCh->dataSetIn |= I2_DRI;
- // pCh->icount.rng++;
- // dss_change = 1;
- //}
- pCh->dataSetIn &= ~I2_RI ;
- break;
- case STAT_BRK_DET:
- pCh->dataSetIn |= I2_BRK;
- pCh->icount.brk++;
- dss_change = 1;
- break;
- // Bookmarks? one less request we're waiting for
- case STAT_BMARK:
- pCh->bookMarks--;
- if (pCh->bookMarks <= 0 ) {
- pCh->bookMarks = 0;
- wake_up_interruptible( &pCh->pBookmarkWait );
- ip2trace (channel, ITRC_DRAIN, 20, 1, pCh->BookmarkTimer.expires );
- }
- break;
- // Flow control packets? Update the new credits, and if
- // someone was waiting for output, queue him up again.
- case STAT_FLOW:
- pCh->outfl.room =
- ((flowStatPtr)pc)->room -
- (pCh->outfl.asof - ((flowStatPtr)pc)->asof);
- ip2trace (channel, ITRC_STFLW, 1, 1, pCh->outfl.room );
- if (pCh->channelNeeds & NEED_CREDIT)
- {
- ip2trace (channel, ITRC_STFLW, 2, 1, pCh->channelNeeds);
- pCh->channelNeeds &= ~NEED_CREDIT;
- i2QueueNeeds(pB, pCh, NEED_INLINE);
- if ( pCh->pTTY )
- ip2_owake(pCh->pTTY);
- }
- ip2trace (channel, ITRC_STFLW, 3, 1, pCh->channelNeeds);
- pc += sizeof(flowStat);
- break;
- /* Special packets: */
- /* Just copy the information into the channel structure */
- case STAT_STATUS:
- pCh->channelStatus = *((debugStatPtr)pc);
- pc += sizeof(debugStat);
- break;
- case STAT_TXCNT:
- pCh->channelTcount = *((cntStatPtr)pc);
- pc += sizeof(cntStat);
- break;
- case STAT_RXCNT:
- pCh->channelRcount = *((cntStatPtr)pc);
- pc += sizeof(cntStat);
- break;
- case STAT_BOXIDS:
- pB->channelBtypes = *((bidStatPtr)pc);
- pc += sizeof(bidStat);
- set_baud_params(pB);
- break;
- case STAT_HWFAIL:
- i2QueueCommands (PTYPE_INLINE, pCh, 0, 1, CMD_HW_TEST);
- pCh->channelFail = *((failStatPtr)pc);
- pc += sizeof(failStat);
- break;
- /* No explicit match? then
- * Might be an error packet...
- */
- default:
- switch (uc & STAT_MOD_ERROR)
- {
- case STAT_ERROR:
- if (uc & STAT_E_PARITY) {
- pCh->dataSetIn |= I2_PAR;
- pCh->icount.parity++;
- }
- if (uc & STAT_E_FRAMING){
- pCh->dataSetIn |= I2_FRA;
- pCh->icount.frame++;
- }
- if (uc & STAT_E_OVERRUN){
- pCh->dataSetIn |= I2_OVR;
- pCh->icount.overrun++;
- }
- break;
- case STAT_MODEM:
- // the answer to DSS_NOW request (not change)
- pCh->dataSetIn = (pCh->dataSetIn
- & ~(I2_RI | I2_CTS | I2_DCD | I2_DSR) )
- | xlatDss[uc & 0xf];
- wake_up_interruptible ( &pCh->dss_now_wait );
- default:
- break;
- }
- } /* End of switch on status type */
- if (dss_change) {
- #ifdef USE_IQ
- queue_task(&pCh->tqueue_status, &tq_immediate);
- mark_bh(IMMEDIATE_BH);
- #else
- do_status(pCh);
- #endif
- }
- }
- else /* Or else, channel is invalid */
- {
- // Even though the channel is invalid, we must test the
- // status to see how much additional data it has (to be
- // skipped)
- switch (*pc++)
- {
- case STAT_FLOW:
- pc += 4; /* Skip the data */
- break;
- default:
- break;
- }
- }
- } // End of while (there is still some status packet left)
- break;
- default: // Neither packet? should be impossible
- ip2trace (ITRC_NO_PORT, ITRC_SFIFO, 5, 1,
- PTYPE_OF(pB->i2eLeadoffWord) );
- break;
- } // End of switch on type of packets
- } //while(board HAS_INPUT)
- ip2trace (ITRC_NO_PORT, ITRC_SFIFO, ITRC_RETURN, 0 );
- // Send acknowledgement to the board even if there was no data!
- pB->i2eOutMailWaiting |= MB_IN_STRIPPED;
- return;
- }
- //******************************************************************************
- // Function: i2Write2Fifo(pB,address,count)
- // Parameters: Pointer to a board structure, source address, byte count
- // Returns: bytes written
- //
- // Description:
- // Writes count bytes to board io address(implied) from source
- // Adjusts count, leaves reserve for next time around bypass cmds
- //******************************************************************************
- static int
- i2Write2Fifo(i2eBordStrPtr pB, unsigned char *source, int count,int reserve)
- {
- int rc = 0;
- unsigned long flags;
- WRITE_LOCK_IRQSAVE(&pB->write_fifo_spinlock,flags);
- if (!pB->i2eWaitingForEmptyFifo) {
- if (pB->i2eFifoRemains > (count+reserve)) {
- pB->i2eFifoRemains -= count;
- iiWriteBuf(pB, source, count);
- pB->i2eOutMailWaiting |= MB_OUT_STUFFED;
- rc = count;
- }
- }
- WRITE_UNLOCK_IRQRESTORE(&pB->write_fifo_spinlock,flags);
- return rc;
- }
- //******************************************************************************
- // Function: i2StuffFifoBypass(pB)
- // Parameters: Pointer to a board structure
- // Returns: Nothing
- //
- // Description:
- // Stuffs as many bypass commands into the fifo as possible. This is simpler
- // than stuffing data or inline commands to fifo, since we do not have
- // flow-control to deal with.
- //******************************************************************************
- static inline void
- i2StuffFifoBypass(i2eBordStrPtr pB)
- {
- i2ChanStrPtr pCh;
- unsigned char *pRemove;
- unsigned short stripIndex;
- unsigned short packetSize;
- unsigned short paddedSize;
- unsigned short notClogged = 1;
- unsigned long flags;
- int bailout = 1000;
- // Continue processing so long as there are entries, or there is room in the
- // fifo. Each entry represents a channel with something to do.
- while ( --bailout && notClogged &&
- (NULL != (pCh = i2DeQueueNeeds(pB,NEED_BYPASS))))
- {
- WRITE_LOCK_IRQSAVE(&pCh->Cbuf_spinlock,flags);
- stripIndex = pCh->Cbuf_strip;
- // as long as there are packets for this channel...
- while (stripIndex != pCh->Cbuf_stuff) {
- pRemove = &(pCh->Cbuf[stripIndex]);
- packetSize = CMD_COUNT_OF(pRemove) + sizeof(i2CmdHeader);
- paddedSize = ROUNDUP(packetSize);
- if (paddedSize > 0) {
- if ( 0 == i2Write2Fifo(pB, pRemove, paddedSize,0)) {
- notClogged = 0; /* fifo full */
- i2QueueNeeds(pB, pCh, NEED_BYPASS); // Put back on queue
- break; // Break from the channel
- }
- }
- #ifdef DEBUG_FIFO
- WriteDBGBuf("BYPS", pRemove, paddedSize);
- #endif /* DEBUG_FIFO */
- pB->debugBypassCount++;
- pRemove += packetSize;
- stripIndex += packetSize;
- if (stripIndex >= CBUF_SIZE) {
- stripIndex = 0;
- pRemove = pCh->Cbuf;
- }
- }
- // Done with this channel. Move to next, removing this one from
- // the queue of channels if we cleaned it out (i.e., didn't get clogged.
- pCh->Cbuf_strip = stripIndex;
- WRITE_UNLOCK_IRQRESTORE(&pCh->Cbuf_spinlock,flags);
- } // Either clogged or finished all the work
- #ifdef IP2DEBUG_TRACE
- if ( !bailout ) {
- ip2trace (ITRC_NO_PORT, ITRC_ERROR, 1, 0 );
- }
- #endif
- }
- //******************************************************************************
- // Function: i2StuffFifoFlow(pB)
- // Parameters: Pointer to a board structure
- // Returns: Nothing
- //
- // Description:
- // Stuffs as many flow control packets into the fifo as possible. This is easier
- // even than doing normal bypass commands, because there is always at most one
- // packet, already assembled, for each channel.
- //******************************************************************************
- static inline void
- i2StuffFifoFlow(i2eBordStrPtr pB)
- {
- i2ChanStrPtr pCh;
- unsigned short paddedSize = ROUNDUP(sizeof(flowIn));
- ip2trace (ITRC_NO_PORT, ITRC_SFLOW, ITRC_ENTER, 2,
- pB->i2eFifoRemains, paddedSize );
- // Continue processing so long as there are entries, or there is room in the
- // fifo. Each entry represents a channel with something to do.
- while ( (NULL != (pCh = i2DeQueueNeeds(pB,NEED_FLOW)))) {
- pB->debugFlowCount++;
- // NO Chan LOCK needed ???
- if ( 0 == i2Write2Fifo(pB,(unsigned char *)&(pCh->infl),paddedSize,0)) {
- break;
- }
- #ifdef DEBUG_FIFO
- WriteDBGBuf("FLOW",(unsigned char *) &(pCh->infl), paddedSize);
- #endif /* DEBUG_FIFO */
- } // Either clogged or finished all the work
- ip2trace (ITRC_NO_PORT, ITRC_SFLOW, ITRC_RETURN, 0 );
- }
- //******************************************************************************
- // Function: i2StuffFifoInline(pB)
- // Parameters: Pointer to a board structure
- // Returns: Nothing
- //
- // Description:
- // Stuffs as much data and inline commands into the fifo as possible. This is
- // the most complex fifo-stuffing operation, since there if now the channel
- // flow-control issue to deal with.
- //******************************************************************************
- static inline void
- i2StuffFifoInline(i2eBordStrPtr pB)
- {
- i2ChanStrPtr pCh;
- unsigned char *pRemove;
- unsigned short stripIndex;
- unsigned short packetSize;
- unsigned short paddedSize;
- unsigned short notClogged = 1;
- unsigned short flowsize;
- unsigned long flags;
- int bailout = 1000;
- int bailout2;
- ip2trace (ITRC_NO_PORT, ITRC_SICMD, ITRC_ENTER, 3, pB->i2eFifoRemains,
- pB->i2Dbuf_strip, pB->i2Dbuf_stuff );
- // Continue processing so long as there are entries, or there is room in the
- // fifo. Each entry represents a channel with something to do.
- while ( --bailout && notClogged &&
- (NULL != (pCh = i2DeQueueNeeds(pB,NEED_INLINE))) )
- {
- WRITE_LOCK_IRQSAVE(&pCh->Obuf_spinlock,flags);
- stripIndex = pCh->Obuf_strip;
- ip2trace (CHANN, ITRC_SICMD, 3, 2, stripIndex, pCh->Obuf_stuff );
- // as long as there are packets for this channel...
- bailout2 = 1000;
- while ( --bailout2 && stripIndex != pCh->Obuf_stuff) {
- pRemove = &(pCh->Obuf[stripIndex]);
- // Must determine whether this be a data or command packet to
- // calculate correctly the header size and the amount of
- // flow-control credit this type of packet will use.
- if (PTYPE_OF(pRemove) == PTYPE_DATA) {
- flowsize = DATA_COUNT_OF(pRemove);
- packetSize = flowsize + sizeof(i2DataHeader);
- } else {
- flowsize = CMD_COUNT_OF(pRemove);
- packetSize = flowsize + sizeof(i2CmdHeader);
- }
- flowsize = CREDIT_USAGE(flowsize);
- paddedSize = ROUNDUP(packetSize);
- ip2trace (CHANN, ITRC_SICMD, 4, 2, pB->i2eFifoRemains, paddedSize );
- // If we don't have enough credits from the board to send the data,
- // flag the channel that we are waiting for flow control credit, and
- // break out. This will clean up this channel and remove us from the
- // queue of hot things to do.
- ip2trace (CHANN, ITRC_SICMD, 5, 2, pCh->outfl.room, flowsize );
- if (pCh->outfl.room <= flowsize) {
- // Do Not have the credits to send this packet.
- i2QueueNeeds(pB, pCh, NEED_CREDIT);
- notClogged = 0;
- break; // So to do next channel
- }
- if ( (paddedSize > 0)
- && ( 0 == i2Write2Fifo(pB, pRemove, paddedSize, 128))) {
- // Do Not have room in fifo to send this packet.
- notClogged = 0;
- i2QueueNeeds(pB, pCh, NEED_INLINE);
- break; // Break from the channel
- }
- #ifdef DEBUG_FIFO
- WriteDBGBuf("DATA", pRemove, paddedSize);
- #endif /* DEBUG_FIFO */
- pB->debugInlineCount++;
- pCh->icount.tx += flowsize;
- // Update current credits
- pCh->outfl.room -= flowsize;
- pCh->outfl.asof += flowsize;
- if (PTYPE_OF(pRemove) == PTYPE_DATA) {
- pCh->Obuf_char_count -= DATA_COUNT_OF(pRemove);
- }
- pRemove += packetSize;
- stripIndex += packetSize;
- ip2trace (CHANN, ITRC_SICMD, 6, 2, stripIndex, pCh->Obuf_strip);
- if (stripIndex >= OBUF_SIZE) {
- stripIndex = 0;
- pRemove = pCh->Obuf;
- ip2trace (CHANN, ITRC_SICMD, 7, 1, stripIndex );
- }
- } /* while */
- if ( !bailout2 ) {
- ip2trace (CHANN, ITRC_ERROR, 3, 0 );
- }
- // Done with this channel. Move to next, removing this one from the
- // queue of channels if we cleaned it out (i.e., didn't get clogged.
- pCh->Obuf_strip = stripIndex;
- WRITE_UNLOCK_IRQRESTORE(&pCh->Obuf_spinlock,flags);
- if ( notClogged )
- {
- ip2trace (CHANN, ITRC_SICMD, 8, 0 );
- if ( pCh->pTTY ) {
- ip2_owake(pCh->pTTY);
- }
- }
- } // Either clogged or finished all the work
- if ( !bailout ) {
- ip2trace (ITRC_NO_PORT, ITRC_ERROR, 4, 0 );
- }
- ip2trace (ITRC_NO_PORT, ITRC_SICMD, ITRC_RETURN, 1,pB->i2Dbuf_strip);
- }
- //******************************************************************************
- // Function: serviceOutgoingFifo(pB)
- // Parameters: Pointer to a board structure
- // Returns: Nothing
- //
- // Description:
- // Helper routine to put data in the outgoing fifo, if we aren't already waiting
- // for something to be there. If the fifo has only room for a very little data,
- // go head and hit the board with a mailbox hit immediately. Otherwise, it will
- // have to happen later in the interrupt processing. Since this routine may be
- // called both at interrupt and foreground time, we must turn off interrupts
- // during the entire process.
- //******************************************************************************
- static void
- serviceOutgoingFifo(i2eBordStrPtr pB)
- {
- // If we aren't currently waiting for the board to empty our fifo, service
- // everything that is pending, in priority order (especially, Bypass before
- // Inline).
- if ( ! pB->i2eWaitingForEmptyFifo )
- {
- i2StuffFifoFlow(pB);
- i2StuffFifoBypass(pB);
- i2StuffFifoInline(pB);
- iiSendPendingMail(pB);
- }
- }
- //******************************************************************************
- // Function: i2ServiceBoard(pB)
- // Parameters: Pointer to a board structure
- // Returns: Nothing
- //
- // Description:
- // Normally this is called from interrupt level, but there is deliberately
- // nothing in here specific to being called from interrupt level. All the
- // hardware-specific, interrupt-specific things happen at the outer levels.
- //
- // For example, a timer interrupt could drive this routine for some sort of
- // polled operation. The only requirement is that the programmer deal with any
- // atomiticity/concurrency issues that result.
- //
- // This routine responds to the board's having sent mailbox information to the
- // host (which would normally cause an interrupt). This routine reads the
- // incoming mailbox. If there is no data in it, this board did not create the
- // interrupt and/or has nothing to be done to it. (Except, if we have been
- // waiting to write mailbox data to it, we may do so.
- //
- // Based on the value in the mailbox, we may take various actions.
- //
- // No checking here of pB validity: after all, it shouldn't have been called by
- // the handler unless pB were on the list.
- //******************************************************************************
- static inline int
- i2ServiceBoard ( i2eBordStrPtr pB )
- {
- unsigned inmail;
- unsigned long flags;
- /* This should be atomic because of the way we are called... */
- if (NO_MAIL_HERE == ( inmail = pB->i2eStartMail ) ) {
- inmail = iiGetMail(pB);
- }
- pB->i2eStartMail = NO_MAIL_HERE;
- ip2trace (ITRC_NO_PORT, ITRC_INTR, 2, 1, inmail );
- if (inmail != NO_MAIL_HERE) {
- // If the board has gone fatal, nothing to do but hit a bit that will
- // alert foreground tasks to protest!
- if ( inmail & MB_FATAL_ERROR ) {
- pB->i2eFatal = 1;
- goto exit_i2ServiceBoard;
- }
- /* Assuming no fatal condition, we proceed to do work */
- if ( inmail & MB_IN_STUFFED ) {
- pB->i2eFifoInInts++;
- i2StripFifo(pB); /* There might be incoming packets */
- }
- if (inmail & MB_OUT_STRIPPED) {
- pB->i2eFifoOutInts++;
- WRITE_LOCK_IRQSAVE(&pB->write_fifo_spinlock,flags);
- pB->i2eFifoRemains = pB->i2eFifoSize;
- pB->i2eWaitingForEmptyFifo = 0;
- WRITE_UNLOCK_IRQRESTORE(&pB->write_fifo_spinlock,flags);
- ip2trace (ITRC_NO_PORT, ITRC_INTR, 30, 1, pB->i2eFifoRemains );
- }
- serviceOutgoingFifo(pB);
- }
- ip2trace (ITRC_NO_PORT, ITRC_INTR, 8, 0 );
- exit_i2ServiceBoard:
- return 0;
- }