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/*

** -----------------------------------------------------------------------------

**

**  Perle Specialix driver for Linux

**  Ported from existing RIO Driver for SCO sources.

 *

 *  (C) 1990 - 2000 Specialix International Ltd., Byfleet, Surrey, UK.

 *

 *      This program is free software; you can redistribute it and/or modify

 *      it under the terms of the GNU General Public License as published by

 *      the Free Software Foundation; either version 2 of the License, or

 *      (at your option) any later version.

 *

 *      This program is distributed in the hope that it will be useful,

 *      but WITHOUT ANY WARRANTY; without even the implied warranty of

 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *      GNU General Public License for more details.

 *

 *      You should have received a copy of the GNU General Public License

 *      along with this program; if not, write to the Free Software

 *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

**

**      Module          : riointr.c

**      SID             : 1.2

**      Last Modified   : 11/6/98 10:33:44

**      Retrieved       : 11/6/98 10:33:49

**

**  ident @(#)riointr.c 1.2

**

** -----------------------------------------------------------------------------

*/

#ifdef SCCS_LABELS

static char *_riointr_c_sccs_ = "@(#)riointr.c  1.2";

#endif

#define __NO_VERSION__

#include <linux/module.h>

#include <linux/slab.h>

#include <linux/errno.h>

#include <linux/tty.h>

#include <asm/io.h>

#include <asm/system.h>

#include <asm/string.h>

#include <asm/semaphore.h>

#include <asm/uaccess.h>

#include <linux/termios.h>

#include <linux/serial.h>

#include <linux/compatmac.h>

#include <linux/generic_serial.h>

#include <linux/delay.h>

#include "linux_compat.h"

#include "rio_linux.h"

#include "typdef.h"

#include "pkt.h"

#include "daemon.h"

#include "rio.h"

#include "riospace.h"

#include "top.h"

#include "cmdpkt.h"

#include "map.h"

#include "riotypes.h"

#include "rup.h"

#include "port.h"

#include "riodrvr.h"

#include "rioinfo.h"

#include "func.h"

#include "errors.h"

#include "pci.h"

#include "parmmap.h"

#include "unixrup.h"

#include "board.h"

#include "host.h"

#include "error.h"

#include "phb.h"

#include "link.h"

#include "cmdblk.h"

#include "route.h"

#include "control.h"

#include "cirrus.h"

#include "rioioctl.h"

/*

** riopoll is called every clock tick. Once the /dev/rio device has been

** opened, and polldistributed( ) has been called, this routine is called

** every clock tick *by every cpu*. The 'interesting' piece of code that

** manipulates 'RIONumCpus' and 'RIOCpuCountdown' is used to fair-share

** the work between the CPUs. If there are 'N' cpus, then each poll time

** we increment a counter, modulo 'N-1'. When this counter is 0, we call

** the interrupt handler. This has the effect that polls are serviced

** by processor 'N', 'N-1', 'N-2', ... '0', round and round. Neat.

*/

void

riopoll(p)

struct rio_info *       p;

{

        int   host;

        /*

        ** Here's the deal. We try to fair share as much as possible amongst

        ** all the processors that are available. Since each processor

        ** should generate HZ ticks per second and since we only need HZ ticks

        ** in total for proper operation we simply attempt to cycle round each

        ** processor in turn, using RIOCpuCountdown to decide whether to call

        ** the interrupt routine. ( In fact the count zeroes when it reaches

        ** one less than the total number of processors - so e.g. on a two

        ** processor system RIOService will get called 2*HZ times per second. )

        ** this_cpu (cur_cpu()) tells us the number of the current processor

        ** as follows:

        **

        **              0 - default CPU

        **              1 - first extra CPU

        **              2 - second extra CPU

        **              etc.

        */

        /*

        ** okay, we've got a cpu that hasn't had a go recently

        ** - lets check to see what needs doing.

        */

        for ( host=0; host<p->RIONumHosts; host++ ) {

                struct Host *HostP = &p->RIOHosts[host];

                rio_spin_lock( &HostP->HostLock );

                if ( ( (HostP->Flags & RUN_STATE) != RC_RUNNING ) ||

                     HostP->InIntr ) {

                        rio_spin_unlock (&HostP->HostLock);

                        continue;

                }

                if ( RWORD( HostP->ParmMapP->rup_intr ) ||

                         RWORD( HostP->ParmMapP->rx_intr  ) ||

                         RWORD( HostP->ParmMapP->tx_intr  ) ) {

                        HostP->InIntr = 1;

#ifdef FUTURE_RELEASE

                        if( HostP->Type == RIO_EISA )

                                INBZ( HostP->Slot, EISA_INTERRUPT_RESET );

                        else

#endif

                                WBYTE( HostP->ResetInt , 0xff );

                        rio_spin_lock(&HostP->HostLock);

                        p->_RIO_Polled++;

                        RIOServiceHost(p, HostP, 'p' );

                        rio_spin_lock( &HostP->HostLock);

                        HostP->InIntr = 0;

                        rio_spin_unlock (&HostP->HostLock);

                }

        }

        rio_spin_unlock (&p->RIOIntrSem);

}

char *firstchars (char *p, int nch)

{

  static char buf[2][128];

  static int t=0;

  t = ! t;

  memcpy (buf[t], p, nch);

  buf[t][nch] = 0;

  return buf[t];

}

#define INCR( P, I )    ((P) = (((P)+(I)) & p->RIOBufferMask))

/* Enable and start the transmission of packets */

void

RIOTxEnable(en)

char *          en;

{

  struct Port * PortP;

  struct rio_info *p;

  struct tty_struct* tty;

  int c;

  struct PKT *  PacketP;

  unsigned long flags;

  PortP = (struct Port *)en;

  p = (struct rio_info *)PortP->p;

  tty = PortP->gs.tty;

  rio_dprintk (RIO_DEBUG_INTR, "tx port %d: %d chars queued.\n",

              PortP->PortNum, PortP->gs.xmit_cnt);

  if (!PortP->gs.xmit_cnt) return;

  /* This routine is an order of magnitude simpler than the specialix

     version. One of the disadvantages is that this version will send

     an incomplete packet (usually 64 bytes instead of 72) once for

     every 4k worth of data. Let's just say that this won't influence

     performance significantly..... */

  rio_spin_lock_irqsave(&PortP->portSem, flags);

  while (can_add_transmit( &PacketP, PortP )) {

    c = PortP->gs.xmit_cnt;

    if (c > PKT_MAX_DATA_LEN) c = PKT_MAX_DATA_LEN;

    /* Don't copy past the end of the source buffer */

    if (c > SERIAL_XMIT_SIZE - PortP->gs.xmit_tail)

      c = SERIAL_XMIT_SIZE - PortP->gs.xmit_tail;

    { int t;

    t = (c > 10)?10:c;

    rio_dprintk (RIO_DEBUG_INTR, "rio: tx port %d: copying %d chars: %s - %s\n",

                 PortP->PortNum, c,

                 firstchars (PortP->gs.xmit_buf + PortP->gs.xmit_tail      , t),

                 firstchars (PortP->gs.xmit_buf + PortP->gs.xmit_tail + c-t, t));

    }

    /* If for one reason or another, we can't copy more data,

       we're done! */

    if (c == 0) break;

    rio_memcpy_toio (PortP->HostP->Caddr, (caddr_t)PacketP->data,

                 PortP->gs.xmit_buf + PortP->gs.xmit_tail, c);

    /*    udelay (1); */

    writeb (c, &(PacketP->len));

    if (!( PortP->State & RIO_DELETED ) ) {

      add_transmit ( PortP );

      /*

      ** Count chars tx'd for port statistics reporting

      */

      if ( PortP->statsGather )

        PortP->txchars += c;

    }

    PortP->gs.xmit_tail = (PortP->gs.xmit_tail + c) & (SERIAL_XMIT_SIZE-1);

    PortP->gs.xmit_cnt -= c;

  }

  rio_spin_unlock_irqrestore(&PortP->portSem, flags);

  if (PortP->gs.xmit_cnt <= (PortP->gs.wakeup_chars + 2*PKT_MAX_DATA_LEN)) {

    rio_dprintk (RIO_DEBUG_INTR, "Waking up.... ldisc:%d (%d/%d)....",

                 (int)(PortP->gs.tty->flags & (1 << TTY_DO_WRITE_WAKEUP)),

                 PortP->gs.wakeup_chars, PortP->gs.xmit_cnt);

    if ((PortP->gs.tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) &&

        PortP->gs.tty->ldisc.write_wakeup)

      (PortP->gs.tty->ldisc.write_wakeup)(PortP->gs.tty);

    rio_dprintk (RIO_DEBUG_INTR, "(%d/%d)\n",

                PortP->gs.wakeup_chars, PortP->gs.xmit_cnt);

    wake_up_interruptible(&PortP->gs.tty->write_wait);

  }

}

/*

** When a real-life interrupt comes in here, we try to find out

** which host card it belongs to, and then service only that host

** Notice the cunning way that, once we've found a candidate, we

** continue just in case we are sharing interrupts.

*/

void

riointr(p)

struct rio_info *       p;

{

        int host;

        for ( host=0; host<p->RIONumHosts; host++ ) {

                struct Host *HostP = &p->RIOHosts[host];

                rio_dprintk (RIO_DEBUG_INTR,  "riointr() doing host %d type %d\n", host, HostP->Type);

                switch( HostP->Type ) {

                        case RIO_AT:

                        case RIO_MCA:

                        case RIO_PCI:

                                rio_spin_lock(&HostP->HostLock);

                                WBYTE(HostP->ResetInt , 0xff);

                                if ( !HostP->InIntr ) {

                                        HostP->InIntr = 1;

                                        rio_spin_unlock (&HostP->HostLock);

                                        p->_RIO_Interrupted++;

                                        RIOServiceHost(p, HostP, 'i');

                                        rio_spin_lock(&HostP->HostLock);

                                        HostP->InIntr = 0;

                                }

                                rio_spin_unlock(&HostP->HostLock);

                                break;

#ifdef FUTURE_RELEASE

                case RIO_EISA:

                        if ( ivec == HostP->Ivec )

                        {

                                OldSpl = LOCKB( &HostP->HostLock );

                                INBZ( HostP->Slot, EISA_INTERRUPT_RESET );

                                if ( !HostP->InIntr )

                                {

                                        HostP->InIntr = 1;

                                        UNLOCKB( &HostP->HostLock, OldSpl );

                                        if ( this_cpu < RIO_CPU_LIMIT )

                                        {

                                                int intrSpl = LOCKB( &RIOIntrLock );

                                                UNLOCKB( &RIOIntrLock, intrSpl );

                                        }

                                                p->_RIO_Interrupted++;

                                        RIOServiceHost( HostP, 'i' );

                                        OldSpl = LOCKB( &HostP->HostLock );

                                        HostP->InIntr = 0;

                                }

                                UNLOCKB( &HostP->HostLock, OldSpl );

                                done++;

                        }

                        break;

#endif

                }

                HostP->IntSrvDone++;

        }

#ifdef FUTURE_RELEASE

        if ( !done )

        {

                cmn_err( CE_WARN, "RIO: Interrupt received with vector 0x%x\n", ivec );

                cmn_err( CE_CONT, "      Valid vectors are:\n");

                for ( host=0; host<RIONumHosts; host++ )

                {

                        switch( RIOHosts[host].Type )

                        {

                                case RIO_AT:

                                case RIO_MCA:

                                case RIO_EISA:

                                                cmn_err( CE_CONT, "0x%x ", RIOHosts[host].Ivec );

                                                break;

                                case RIO_PCI:

                                                cmn_err( CE_CONT, "0x%x ", get_intr_arg( RIOHosts[host].PciDevInfo.busnum, IDIST_PCI_IRQ( RIOHosts[host].PciDevInfo.slotnum, RIOHosts[host].PciDevInfo.funcnum ) ));

                                                break;

                        }

                }

                cmn_err( CE_CONT, "\n" );

        }

#endif

}

/*

** RIO Host Service routine. Does all the work traditionally associated with an

** interrupt.

*/

static int      RupIntr;

static int      RxIntr;

static int      TxIntr;

void

RIOServiceHost(p, HostP, From)

struct rio_info *       p;

struct Host *HostP;

int From;

{

  rio_spin_lock (&HostP->HostLock);

  if ( (HostP->Flags & RUN_STATE) != RC_RUNNING ) {

    static int t =0;

    rio_spin_unlock (&HostP->HostLock);

    if ((t++ % 200) == 0)

      rio_dprintk (RIO_DEBUG_INTR, "Interrupt but host not running. flags=%x.\n", (int)HostP->Flags);

    return;

  }

  rio_spin_unlock (&HostP->HostLock);

  if ( RWORD( HostP->ParmMapP->rup_intr ) ) {

    WWORD( HostP->ParmMapP->rup_intr , 0 );

    p->RIORupCount++;

    RupIntr++;

    rio_dprintk (RIO_DEBUG_INTR, "rio: RUP interrupt on host %d\n", HostP-p->RIOHosts);

    RIOPollHostCommands(p, HostP );

  }

  if ( RWORD( HostP->ParmMapP->rx_intr ) ) {

    int port;

    WWORD( HostP->ParmMapP->rx_intr , 0 );

    p->RIORxCount++;

    RxIntr++;

    rio_dprintk (RIO_DEBUG_INTR, "rio: RX interrupt on host %d\n", HostP-p->RIOHosts);

    /*

    ** Loop through every port. If the port is mapped into

    ** the system ( i.e. has /dev/ttyXXXX associated ) then it is

    ** worth checking. If the port isn't open, grab any packets

    ** hanging on its receive queue and stuff them on the free

    ** list; check for commands on the way.

    */

    for ( port=p->RIOFirstPortsBooted;

          port<p->RIOLastPortsBooted+PORTS_PER_RTA; port++ ) {

      struct Port *PortP = p->RIOPortp[port];

      struct tty_struct *ttyP;

      struct PKT *PacketP;

      /*

      ** not mapped in - most of the RIOPortp[] information

      ** has not been set up!

      ** Optimise: ports come in bundles of eight.

      */

      if ( !PortP->Mapped ) {

        port += 7;

        continue; /* with the next port */

      }

      /*

      ** If the host board isn't THIS host board, check the next one.

      ** optimise: ports come in bundles of eight.

      */

      if ( PortP->HostP != HostP ) {

        port += 7;

        continue;

      }

      /*

      ** Let us see - is the port open? If not, then don't service it.

      */

      if ( !( PortP->PortState & PORT_ISOPEN ) ) {

        continue;

      }

      /*

      ** find corresponding tty structure. The process of mapping

      ** the ports puts these here.

      */

      ttyP = PortP->gs.tty;

      /*

      ** Lock the port before we begin working on it.

      */

      rio_spin_lock(&PortP->portSem);

      /*

      ** Process received data if there is any.

      */

      if ( can_remove_receive( &PacketP, PortP ) )

        RIOReceive(p, PortP);

      /*

      ** If there is no data left to be read from the port, and

      ** it's handshake bit is set, then we must clear the handshake,

      ** so that that downstream RTA is re-enabled.

      */

      if ( !can_remove_receive( &PacketP, PortP ) &&

           ( RWORD( PortP->PhbP->handshake )==PHB_HANDSHAKE_SET ) ) {

                                /*

                                ** MAGIC! ( Basically, handshake the RX buffer, so that

                                ** the RTAs upstream can be re-enabled. )

                                */

        rio_dprintk (RIO_DEBUG_INTR, "Set RX handshake bit\n");

        WWORD( PortP->PhbP->handshake,

               PHB_HANDSHAKE_SET|PHB_HANDSHAKE_RESET );

      }

      rio_spin_unlock(&PortP->portSem);

    }

  }

  if ( RWORD( HostP->ParmMapP->tx_intr ) ) {

    int port;

    WWORD( HostP->ParmMapP->tx_intr , 0);

    p->RIOTxCount++;

    TxIntr++;

    rio_dprintk (RIO_DEBUG_INTR, "rio: TX interrupt on host %d\n", HostP-p->RIOHosts);

    /*

    ** Loop through every port.

    ** If the port is mapped into the system ( i.e. has /dev/ttyXXXX

    ** associated ) then it is worth checking.

    */

    for ( port=p->RIOFirstPortsBooted;

          port<p->RIOLastPortsBooted+PORTS_PER_RTA; port++ ) {

      struct Port *PortP = p->RIOPortp[port];

      struct tty_struct *ttyP;

      struct PKT *PacketP;

      /*

      ** not mapped in - most of the RIOPortp[] information

      ** has not been set up!

      */

      if ( !PortP->Mapped ) {

        port += 7;

        continue; /* with the next port */

      }

      /*

      ** If the host board isn't running, then its data structures

      ** are no use to us - continue quietly.

      */

      if ( PortP->HostP != HostP ) {

        port += 7;

        continue; /* with the next port */

      }

      /*

      ** Let us see - is the port open? If not, then don't service it.

      */

      if ( !( PortP->PortState & PORT_ISOPEN ) ) {

        continue;

      }

      rio_dprintk (RIO_DEBUG_INTR, "rio: Looking into port %d.\n", port);

      /*

      ** Lock the port before we begin working on it.

      */

      rio_spin_lock(&PortP->portSem);

      /*

      ** If we can't add anything to the transmit queue, then

      ** we need do none of this processing.

      */

      if ( !can_add_transmit( &PacketP, PortP ) ) {

        rio_dprintk (RIO_DEBUG_INTR, "Can't add to port, so skipping.\n");

        rio_spin_unlock(&PortP->portSem);

        continue;

      }

      /*

      ** find corresponding tty structure. The process of mapping

      ** the ports puts these here.

      */

      ttyP = PortP->gs.tty;

      /* If ttyP is NULL, the port is getting closed. Forget about it. */

      if (!ttyP) {

        rio_dprintk (RIO_DEBUG_INTR, "no tty, so skipping.\n");

        rio_spin_unlock(&PortP->portSem);

        continue;

      }

      /*

      ** If there is more room available we start up the transmit

      ** data process again. This can be direct I/O, if the cookmode

      ** is set to COOK_RAW or COOK_MEDIUM, or will be a call to the

      ** riotproc( T_OUTPUT ) if we are in COOK_WELL mode, to fetch

      ** characters via the line discipline. We must always call

      ** the line discipline,

      ** so that user input characters can be echoed correctly.

      **

      ** ++++ Update +++++

      ** With the advent of double buffering, we now see if

      ** TxBufferOut-In is non-zero. If so, then we copy a packet

      ** to the output place, and set it going. If this empties

      ** the buffer, then we must issue a wakeup( ) on OUT.

      ** If it frees space in the buffer then we must issue

      ** a wakeup( ) on IN.

      **

      ** ++++ Extra! Extra! If PortP->WflushFlag is set, then we

      ** have to send a WFLUSH command down the PHB, to mark the

      ** end point of a WFLUSH. We also need to clear out any

      ** data from the double buffer! ( note that WflushFlag is a

      ** *count* of the number of WFLUSH commands outstanding! )

      **

      ** ++++ And there's more!

      ** If an RTA is powered off, then on again, and rebooted,

      ** whilst it has ports open, then we need to re-open the ports.

      ** ( reasonable enough ). We can't do this when we spot the

      ** re-boot, in interrupt time, because the queue is probably

      ** full. So, when we come in here, we need to test if any

      ** ports are in this condition, and re-open the port before

      ** we try to send any more data to it. Now, the re-booted

      ** RTA will be discarding packets from the PHB until it

      ** receives this open packet, but don't worry tooo much

      ** about that. The one thing that is interesting is the

      ** combination of this effect and the WFLUSH effect!

      */

      /* For now don't handle RTA reboots. -- REW.

         Reenabled. Otherwise RTA reboots didn't work. Duh. -- REW */

      if ( PortP->MagicFlags ) {

#if 1

        if ( PortP->MagicFlags & MAGIC_REBOOT ) {

          /*

          ** well, the RTA has been rebooted, and there is room

          ** on its queue to add the open packet that is required.

          **

          ** The messy part of this line is trying to decide if

          ** we need to call the Param function as a tty or as

          ** a modem.

          ** DONT USE CLOCAL AS A TEST FOR THIS!

          **

          ** If we can't param the port, then move on to the

          ** next port.

          */

          PortP->InUse = NOT_INUSE;

          rio_spin_unlock(&PortP->portSem);

          if ( RIOParam(PortP, OPEN, ((PortP->Cor2Copy &

                                       (COR2_RTSFLOW|COR2_CTSFLOW ) )==

                                      (COR2_RTSFLOW|COR2_CTSFLOW ) ) ?

                        TRUE : FALSE, DONT_SLEEP ) == RIO_FAIL ) {

            continue; /* with next port */

          }

          rio_spin_lock(&PortP->portSem);

          PortP->MagicFlags &= ~MAGIC_REBOOT;

        }

#endif

        /*

        ** As mentioned above, this is a tacky hack to cope

        ** with WFLUSH

        */

        if ( PortP->WflushFlag ) {

          rio_dprintk (RIO_DEBUG_INTR, "Want to WFLUSH mark this port\n");

          if ( PortP->InUse )

            rio_dprintk (RIO_DEBUG_INTR, "FAILS - PORT IS IN USE\n");

        }

        while ( PortP->WflushFlag &&

                can_add_transmit( &PacketP, PortP ) &&

                ( PortP->InUse == NOT_INUSE ) ) {

          int p;

          struct PktCmd *PktCmdP;

          rio_dprintk (RIO_DEBUG_INTR, "Add WFLUSH marker to data queue\n");

          /*

          ** make it look just like a WFLUSH command

          */

          PktCmdP = ( struct PktCmd * )&PacketP->data[0];

          WBYTE( PktCmdP->Command , WFLUSH );

          p =  PortP->HostPort % ( ushort )PORTS_PER_RTA;

          /*

          ** If second block of ports for 16 port RTA, add 8

          ** to index 8-15.

          */

          if ( PortP->SecondBlock )

            p += PORTS_PER_RTA;

          WBYTE( PktCmdP->PhbNum, p );

          /*

          ** to make debuggery easier

          */

          WBYTE( PacketP->data[ 2], 'W'  );

          WBYTE( PacketP->data[ 3], 'F'  );

          WBYTE( PacketP->data[ 4], 'L'  );

          WBYTE( PacketP->data[ 5], 'U'  );

          WBYTE( PacketP->data[ 6], 'S'  );

          WBYTE( PacketP->data[ 7], 'H'  );

          WBYTE( PacketP->data[ 8], ' '  );

          WBYTE( PacketP->data[ 9], '0'+PortP->WflushFlag );

          WBYTE( PacketP->data[10], ' '  );

          WBYTE( PacketP->data[11], ' '  );

          WBYTE( PacketP->data[12], '\0' );

          /*

          ** its two bytes long!

          */

          WBYTE( PacketP->len , PKT_CMD_BIT | 2 );

          /*

          ** queue it!

          */

          if ( !( PortP->State & RIO_DELETED ) ) {

            add_transmit( PortP );

            /*

            ** Count chars tx'd for port statistics reporting

            */

            if ( PortP->statsGather )

              PortP->txchars += 2;

          }

          if ( --( PortP->WflushFlag ) == 0 ) {

            PortP->MagicFlags &= ~MAGIC_FLUSH;

          }

          rio_dprintk (RIO_DEBUG_INTR, "Wflush count now stands at %d\n",

                 PortP->WflushFlag);

        }

        if ( PortP->MagicFlags & MORE_OUTPUT_EYGOR ) {

          if ( PortP->MagicFlags & MAGIC_FLUSH ) {

            PortP->MagicFlags |= MORE_OUTPUT_EYGOR;

          }

          else {

            if ( !can_add_transmit( &PacketP, PortP ) ) {

              rio_spin_unlock(&PortP->portSem);

              continue;

            }

            rio_spin_unlock(&PortP->portSem);

            RIOTxEnable((char *)PortP);

            rio_spin_lock(&PortP->portSem);

            PortP->MagicFlags &= ~MORE_OUTPUT_EYGOR;

          }

        }

      }

      /*

      ** If we can't add anything to the transmit queue, then

      ** we need do none of the remaining processing.

      */

      if (!can_add_transmit( &PacketP, PortP ) ) {

        rio_spin_unlock(&PortP->portSem);

        continue;

      }

      rio_spin_unlock(&PortP->portSem);

      RIOTxEnable((char *)PortP);