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riocmd.c

/*
** -----------------------------------------------------------------------------
**
**  Perle Specialix driver for Linux
**  ported from the existing SCO driver source
**
 *
 *  (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            : riocmd.c
**    SID         : 1.2
**    Last Modified     : 11/6/98 10:33:41
**    Retrieved   : 11/6/98 10:33:49
**
**  ident @(#)riocmd.c  1.2
**
** -----------------------------------------------------------------------------
*/
#ifdef SCCS_LABELS
static char *_riocmd_c_sccs_ = "@(#)riocmd.c    1.2";
#endif

#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/generic_serial.h>

#include "linux_compat.h"
#include "rio_linux.h"
#include "pkt.h"
#include "daemon.h"
#include "rio.h"
#include "riospace.h"
#include "cmdpkt.h"
#include "map.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 "phb.h"
#include "link.h"
#include "cmdblk.h"
#include "route.h"
#include "cirrus.h"


static struct IdentifyRta IdRta;
static struct KillNeighbour KillUnit;

int RIOFoadRta(struct Host *HostP, struct Map *MapP)
{
      struct CmdBlk *CmdBlkP;

      rio_dprintk(RIO_DEBUG_CMD, "FOAD RTA\n");

      CmdBlkP = RIOGetCmdBlk();

      if (!CmdBlkP) {
            rio_dprintk(RIO_DEBUG_CMD, "FOAD RTA: GetCmdBlk failed\n");
            return -ENXIO;
      }

      CmdBlkP->Packet.dest_unit = MapP->ID;
      CmdBlkP->Packet.dest_port = BOOT_RUP;
      CmdBlkP->Packet.src_unit = 0;
      CmdBlkP->Packet.src_port = BOOT_RUP;
      CmdBlkP->Packet.len = 0x84;
      CmdBlkP->Packet.data[0] = IFOAD;
      CmdBlkP->Packet.data[1] = 0;
      CmdBlkP->Packet.data[2] = IFOAD_MAGIC & 0xFF;
      CmdBlkP->Packet.data[3] = (IFOAD_MAGIC >> 8) & 0xFF;

      if (RIOQueueCmdBlk(HostP, MapP->ID - 1, CmdBlkP) == RIO_FAIL) {
            rio_dprintk(RIO_DEBUG_CMD, "FOAD RTA: Failed to queue foad command\n");
            return -EIO;
      }
      return 0;
}

int RIOZombieRta(struct Host *HostP, struct Map *MapP)
{
      struct CmdBlk *CmdBlkP;

      rio_dprintk(RIO_DEBUG_CMD, "ZOMBIE RTA\n");

      CmdBlkP = RIOGetCmdBlk();

      if (!CmdBlkP) {
            rio_dprintk(RIO_DEBUG_CMD, "ZOMBIE RTA: GetCmdBlk failed\n");
            return -ENXIO;
      }

      CmdBlkP->Packet.dest_unit = MapP->ID;
      CmdBlkP->Packet.dest_port = BOOT_RUP;
      CmdBlkP->Packet.src_unit = 0;
      CmdBlkP->Packet.src_port = BOOT_RUP;
      CmdBlkP->Packet.len = 0x84;
      CmdBlkP->Packet.data[0] = ZOMBIE;
      CmdBlkP->Packet.data[1] = 0;
      CmdBlkP->Packet.data[2] = ZOMBIE_MAGIC & 0xFF;
      CmdBlkP->Packet.data[3] = (ZOMBIE_MAGIC >> 8) & 0xFF;

      if (RIOQueueCmdBlk(HostP, MapP->ID - 1, CmdBlkP) == RIO_FAIL) {
            rio_dprintk(RIO_DEBUG_CMD, "ZOMBIE RTA: Failed to queue zombie command\n");
            return -EIO;
      }
      return 0;
}

int RIOCommandRta(struct rio_info *p, unsigned long RtaUnique, int (*func) (struct Host * HostP, struct Map * MapP))
{
      unsigned int Host;

      rio_dprintk(RIO_DEBUG_CMD, "Command RTA 0x%lx func %p\n", RtaUnique, func);

      if (!RtaUnique)
            return (0);

      for (Host = 0; Host < p->RIONumHosts; Host++) {
            unsigned int Rta;
            struct Host *HostP = &p->RIOHosts[Host];

            for (Rta = 0; Rta < RTAS_PER_HOST; Rta++) {
                  struct Map *MapP = &HostP->Mapping[Rta];

                  if (MapP->RtaUniqueNum == RtaUnique) {
                        uint Link;

                        /*
                         ** now, lets just check we have a route to it...
                         ** IF the routing stuff is working, then one of the
                         ** topology entries for this unit will have a legit
                         ** route *somewhere*. We care not where - if its got
                         ** any connections, we can get to it.
                         */
                        for (Link = 0; Link < LINKS_PER_UNIT; Link++) {
                              if (MapP->Topology[Link].Unit <= (u8) MAX_RUP) {
                                    /*
                                     ** Its worth trying the operation...
                                     */
                                    return (*func) (HostP, MapP);
                              }
                        }
                  }
            }
      }
      return -ENXIO;
}


int RIOIdentifyRta(struct rio_info *p, void __user * arg)
{
      unsigned int Host;

      if (copy_from_user(&IdRta, arg, sizeof(IdRta))) {
            rio_dprintk(RIO_DEBUG_CMD, "RIO_IDENTIFY_RTA copy failed\n");
            p->RIOError.Error = COPYIN_FAILED;
            return -EFAULT;
      }

      for (Host = 0; Host < p->RIONumHosts; Host++) {
            unsigned int Rta;
            struct Host *HostP = &p->RIOHosts[Host];

            for (Rta = 0; Rta < RTAS_PER_HOST; Rta++) {
                  struct Map *MapP = &HostP->Mapping[Rta];

                  if (MapP->RtaUniqueNum == IdRta.RtaUnique) {
                        uint Link;
                        /*
                         ** now, lets just check we have a route to it...
                         ** IF the routing stuff is working, then one of the
                         ** topology entries for this unit will have a legit
                         ** route *somewhere*. We care not where - if its got
                         ** any connections, we can get to it.
                         */
                        for (Link = 0; Link < LINKS_PER_UNIT; Link++) {
                              if (MapP->Topology[Link].Unit <= (u8) MAX_RUP) {
                                    /*
                                     ** Its worth trying the operation...
                                     */
                                    struct CmdBlk *CmdBlkP;

                                    rio_dprintk(RIO_DEBUG_CMD, "IDENTIFY RTA\n");

                                    CmdBlkP = RIOGetCmdBlk();

                                    if (!CmdBlkP) {
                                          rio_dprintk(RIO_DEBUG_CMD, "IDENTIFY RTA: GetCmdBlk failed\n");
                                          return -ENXIO;
                                    }

                                    CmdBlkP->Packet.dest_unit = MapP->ID;
                                    CmdBlkP->Packet.dest_port = BOOT_RUP;
                                    CmdBlkP->Packet.src_unit = 0;
                                    CmdBlkP->Packet.src_port = BOOT_RUP;
                                    CmdBlkP->Packet.len = 0x84;
                                    CmdBlkP->Packet.data[0] = IDENTIFY;
                                    CmdBlkP->Packet.data[1] = 0;
                                    CmdBlkP->Packet.data[2] = IdRta.ID;

                                    if (RIOQueueCmdBlk(HostP, MapP->ID - 1, CmdBlkP) == RIO_FAIL) {
                                          rio_dprintk(RIO_DEBUG_CMD, "IDENTIFY RTA: Failed to queue command\n");
                                          return -EIO;
                                    }
                                    return 0;
                              }
                        }
                  }
            }
      }
      return -ENOENT;
}


int RIOKillNeighbour(struct rio_info *p, void __user * arg)
{
      uint Host;
      uint ID;
      struct Host *HostP;
      struct CmdBlk *CmdBlkP;

      rio_dprintk(RIO_DEBUG_CMD, "KILL HOST NEIGHBOUR\n");

      if (copy_from_user(&KillUnit, arg, sizeof(KillUnit))) {
            rio_dprintk(RIO_DEBUG_CMD, "RIO_KILL_NEIGHBOUR copy failed\n");
            p->RIOError.Error = COPYIN_FAILED;
            return -EFAULT;
      }

      if (KillUnit.Link > 3)
            return -ENXIO;

      CmdBlkP = RIOGetCmdBlk();

      if (!CmdBlkP) {
            rio_dprintk(RIO_DEBUG_CMD, "UFOAD: GetCmdBlk failed\n");
            return -ENXIO;
      }

      CmdBlkP->Packet.dest_unit = 0;
      CmdBlkP->Packet.src_unit = 0;
      CmdBlkP->Packet.dest_port = BOOT_RUP;
      CmdBlkP->Packet.src_port = BOOT_RUP;
      CmdBlkP->Packet.len = 0x84;
      CmdBlkP->Packet.data[0] = UFOAD;
      CmdBlkP->Packet.data[1] = KillUnit.Link;
      CmdBlkP->Packet.data[2] = UFOAD_MAGIC & 0xFF;
      CmdBlkP->Packet.data[3] = (UFOAD_MAGIC >> 8) & 0xFF;

      for (Host = 0; Host < p->RIONumHosts; Host++) {
            ID = 0;
            HostP = &p->RIOHosts[Host];

            if (HostP->UniqueNum == KillUnit.UniqueNum) {
                  if (RIOQueueCmdBlk(HostP, RTAS_PER_HOST + KillUnit.Link, CmdBlkP) == RIO_FAIL) {
                        rio_dprintk(RIO_DEBUG_CMD, "UFOAD: Failed queue command\n");
                        return -EIO;
                  }
                  return 0;
            }

            for (ID = 0; ID < RTAS_PER_HOST; ID++) {
                  if (HostP->Mapping[ID].RtaUniqueNum == KillUnit.UniqueNum) {
                        CmdBlkP->Packet.dest_unit = ID + 1;
                        if (RIOQueueCmdBlk(HostP, ID, CmdBlkP) == RIO_FAIL) {
                              rio_dprintk(RIO_DEBUG_CMD, "UFOAD: Failed queue command\n");
                              return -EIO;
                        }
                        return 0;
                  }
            }
      }
      RIOFreeCmdBlk(CmdBlkP);
      return -ENXIO;
}

int RIOSuspendBootRta(struct Host *HostP, int ID, int Link)
{
      struct CmdBlk *CmdBlkP;

      rio_dprintk(RIO_DEBUG_CMD, "SUSPEND BOOT ON RTA ID %d, link %c\n", ID, 'A' + Link);

      CmdBlkP = RIOGetCmdBlk();

      if (!CmdBlkP) {
            rio_dprintk(RIO_DEBUG_CMD, "SUSPEND BOOT ON RTA: GetCmdBlk failed\n");
            return -ENXIO;
      }

      CmdBlkP->Packet.dest_unit = ID;
      CmdBlkP->Packet.dest_port = BOOT_RUP;
      CmdBlkP->Packet.src_unit = 0;
      CmdBlkP->Packet.src_port = BOOT_RUP;
      CmdBlkP->Packet.len = 0x84;
      CmdBlkP->Packet.data[0] = IWAIT;
      CmdBlkP->Packet.data[1] = Link;
      CmdBlkP->Packet.data[2] = IWAIT_MAGIC & 0xFF;
      CmdBlkP->Packet.data[3] = (IWAIT_MAGIC >> 8) & 0xFF;

      if (RIOQueueCmdBlk(HostP, ID - 1, CmdBlkP) == RIO_FAIL) {
            rio_dprintk(RIO_DEBUG_CMD, "SUSPEND BOOT ON RTA: Failed to queue iwait command\n");
            return -EIO;
      }
      return 0;
}

int RIOFoadWakeup(struct rio_info *p)
{
      int port;
      struct Port *PortP;
      unsigned long flags;

      for (port = 0; port < RIO_PORTS; port++) {
            PortP = p->RIOPortp[port];

            rio_spin_lock_irqsave(&PortP->portSem, flags);
            PortP->Config = 0;
            PortP->State = 0;
            PortP->InUse = NOT_INUSE;
            PortP->PortState = 0;
            PortP->FlushCmdBodge = 0;
            PortP->ModemLines = 0;
            PortP->ModemState = 0;
            PortP->CookMode = 0;
            PortP->ParamSem = 0;
            PortP->Mapped = 0;
            PortP->WflushFlag = 0;
            PortP->MagicFlags = 0;
            PortP->RxDataStart = 0;
            PortP->TxBufferIn = 0;
            PortP->TxBufferOut = 0;
            rio_spin_unlock_irqrestore(&PortP->portSem, flags);
      }
      return (0);
}

/*
** Incoming command on the COMMAND_RUP to be processed.
*/
static int RIOCommandRup(struct rio_info *p, uint Rup, struct Host *HostP, struct PKT __iomem *PacketP)
{
      struct PktCmd __iomem *PktCmdP = (struct PktCmd __iomem *)PacketP->data;
      struct Port *PortP;
      struct UnixRup *UnixRupP;
      unsigned short SysPort;
      unsigned short ReportedModemStatus;
      unsigned short rup;
      unsigned short subCommand;
      unsigned long flags;

      func_enter();

      /*
       ** 16 port RTA note:
       ** Command rup packets coming from the RTA will have pkt->data[1] (which
       ** translates to PktCmdP->PhbNum) set to the host port number for the
       ** particular unit. To access the correct BaseSysPort for a 16 port RTA,
       ** we can use PhbNum to get the rup number for the appropriate 8 port
       ** block (for the first block, this should be equal to 'Rup').
       */
      rup = readb(&PktCmdP->PhbNum) / (unsigned short) PORTS_PER_RTA;
      UnixRupP = &HostP->UnixRups[rup];
      SysPort = UnixRupP->BaseSysPort + (readb(&PktCmdP->PhbNum) % (unsigned short) PORTS_PER_RTA);
      rio_dprintk(RIO_DEBUG_CMD, "Command on rup %d, port %d\n", rup, SysPort);

      if (UnixRupP->BaseSysPort == NO_PORT) {
            rio_dprintk(RIO_DEBUG_CMD, "OBSCURE ERROR!\n");
            rio_dprintk(RIO_DEBUG_CMD, "Diagnostics follow. Please WRITE THESE DOWN and report them to Specialix Technical Support\n");
            rio_dprintk(RIO_DEBUG_CMD, "CONTROL information: Host number %Zd, name ``%s''\n", HostP - p->RIOHosts, HostP->Name);
            rio_dprintk(RIO_DEBUG_CMD, "CONTROL information: Rup number  0x%x\n", rup);

            if (Rup < (unsigned short) MAX_RUP) {
                  rio_dprintk(RIO_DEBUG_CMD, "CONTROL information: This is the RUP for RTA ``%s''\n", HostP->Mapping[Rup].Name);
            } else
                  rio_dprintk(RIO_DEBUG_CMD, "CONTROL information: This is the RUP for link ``%c'' of host ``%s''\n", ('A' + Rup - MAX_RUP), HostP->Name);

            rio_dprintk(RIO_DEBUG_CMD, "PACKET information: Destination 0x%x:0x%x\n", readb(&PacketP->dest_unit), readb(&PacketP->dest_port));
            rio_dprintk(RIO_DEBUG_CMD, "PACKET information: Source        0x%x:0x%x\n", readb(&PacketP->src_unit), readb(&PacketP->src_port));
            rio_dprintk(RIO_DEBUG_CMD, "PACKET information: Length        0x%x (%d)\n", readb(&PacketP->len), readb(&PacketP->len));
            rio_dprintk(RIO_DEBUG_CMD, "PACKET information: Control      0x%x (%d)\n", readb(&PacketP->control), readb(&PacketP->control));
            rio_dprintk(RIO_DEBUG_CMD, "PACKET information: Check    0x%x (%d)\n", readw(&PacketP->csum), readw(&PacketP->csum));
            rio_dprintk(RIO_DEBUG_CMD, "COMMAND information: Host Port Number 0x%x, " "Command Code 0x%x\n", readb(&PktCmdP->PhbNum), readb(&PktCmdP->Command));
            return 1;
      }
      PortP = p->RIOPortp[SysPort];
      rio_spin_lock_irqsave(&PortP->portSem, flags);
      switch (readb(&PktCmdP->Command)) {
      case BREAK_RECEIVED:
            rio_dprintk(RIO_DEBUG_CMD, "Received a break!\n");
            /* If the current line disc. is not multi-threading and
               the current processor is not the default, reset rup_intr
               and return 0 to ensure that the command packet is
               not freed. */
            /* Call tmgr HANGUP HERE */
            /* Fix this later when every thing works !!!! RAMRAJ */
            gs_got_break(&PortP->gs);
            break;

      case COMPLETE:
            rio_dprintk(RIO_DEBUG_CMD, "Command complete on phb %d host %Zd\n", readb(&PktCmdP->PhbNum), HostP - p->RIOHosts);
            subCommand = 1;
            switch (readb(&PktCmdP->SubCommand)) {
            case MEMDUMP:
                  rio_dprintk(RIO_DEBUG_CMD, "Memory dump cmd (0x%x) from addr 0x%x\n", readb(&PktCmdP->SubCommand), readw(&PktCmdP->SubAddr));
                  break;
            case READ_REGISTER:
                  rio_dprintk(RIO_DEBUG_CMD, "Read register (0x%x)\n", readw(&PktCmdP->SubAddr));
                  p->CdRegister = (readb(&PktCmdP->ModemStatus) & MSVR1_HOST);
                  break;
            default:
                  subCommand = 0;
                  break;
            }
            if (subCommand)
                  break;
            rio_dprintk(RIO_DEBUG_CMD, "New status is 0x%x was 0x%x\n", readb(&PktCmdP->PortStatus), PortP->PortState);
            if (PortP->PortState != readb(&PktCmdP->PortStatus)) {
                  rio_dprintk(RIO_DEBUG_CMD, "Mark status & wakeup\n");
                  PortP->PortState = readb(&PktCmdP->PortStatus);
                  /* What should we do here ...
                     wakeup( &PortP->PortState );
                   */
            } else
                  rio_dprintk(RIO_DEBUG_CMD, "No change\n");

            /* FALLTHROUGH */
      case MODEM_STATUS:
            /*
             ** Knock out the tbusy and tstop bits, as these are not relevant
             ** to the check for modem status change (they're just there because
             ** it's a convenient place to put them!).
             */
            ReportedModemStatus = readb(&PktCmdP->ModemStatus);
            if ((PortP->ModemState & MSVR1_HOST) == (ReportedModemStatus & MSVR1_HOST)) {
                  rio_dprintk(RIO_DEBUG_CMD, "Modem status unchanged 0x%x\n", PortP->ModemState);
                  /*
                   ** Update ModemState just in case tbusy or tstop states have
                   ** changed.
                   */
                  PortP->ModemState = ReportedModemStatus;
            } else {
                  rio_dprintk(RIO_DEBUG_CMD, "Modem status change from 0x%x to 0x%x\n", PortP->ModemState, ReportedModemStatus);
                  PortP->ModemState = ReportedModemStatus;
#ifdef MODEM_SUPPORT
                  if (PortP->Mapped) {
                        /***********************************************************\
                        *************************************************************
                        ***                                                                              ***
                        ***           M O D E M   S T A T E   C H A N G E             ***
                        ***                                                                              ***
                        *************************************************************
                        \***********************************************************/
                        /*
                         ** If the device is a modem, then check the modem
                         ** carrier.
                         */
                        if (PortP->gs.tty == NULL)
                              break;
                        if (PortP->gs.tty->termios == NULL)
                              break;

                        if (!(PortP->gs.tty->termios->c_cflag & CLOCAL) && ((PortP->State & (RIO_MOPEN | RIO_WOPEN)))) {

                              rio_dprintk(RIO_DEBUG_CMD, "Is there a Carrier?\n");
                              /*
                               ** Is there a carrier?
                               */
                              if (PortP->ModemState & MSVR1_CD) {
                                    /*
                                     ** Has carrier just appeared?
                                     */
                                    if (!(PortP->State & RIO_CARR_ON)) {
                                          rio_dprintk(RIO_DEBUG_CMD, "Carrier just came up.\n");
                                          PortP->State |= RIO_CARR_ON;
                                          /*
                                           ** wakeup anyone in WOPEN
                                           */
                                          if (PortP->State & (PORT_ISOPEN | RIO_WOPEN))
                                                wake_up_interruptible(&PortP->gs.open_wait);
                                    }
                              } else {
                                    /*
                                     ** Has carrier just dropped?
                                     */
                                    if (PortP->State & RIO_CARR_ON) {
                                          if (PortP->State & (PORT_ISOPEN | RIO_WOPEN | RIO_MOPEN))
                                                tty_hangup(PortP->gs.tty);
                                          PortP->State &= ~RIO_CARR_ON;
                                          rio_dprintk(RIO_DEBUG_CMD, "Carrirer just went down\n");
                                    }
                              }
                        }
                  }
#endif
            }
            break;

      default:
            rio_dprintk(RIO_DEBUG_CMD, "Unknown command %d on CMD_RUP of host %Zd\n", readb(&PktCmdP->Command), HostP - p->RIOHosts);
            break;
      }
      rio_spin_unlock_irqrestore(&PortP->portSem, flags);

      func_exit();

      return 1;
}

/*
** The command mechanism:
**    Each rup has a chain of commands associated with it.
**    This chain is maintained by routines in this file.
**    Periodically we are called and we run a quick check of all the
**    active chains to determine if there is a command to be executed,
**    and if the rup is ready to accept it.
**
*/

/*
** Allocate an empty command block.
*/
struct CmdBlk *RIOGetCmdBlk(void)
{
      struct CmdBlk *CmdBlkP;

      CmdBlkP = kzalloc(sizeof(struct CmdBlk), GFP_ATOMIC);
      return CmdBlkP;
}

/*
** Return a block to the head of the free list.
*/
void RIOFreeCmdBlk(struct CmdBlk *CmdBlkP)
{
      kfree(CmdBlkP);
}

/*
** attach a command block to the list of commands to be performed for
** a given rup.
*/
int RIOQueueCmdBlk(struct Host *HostP, uint Rup, struct CmdBlk *CmdBlkP)
{
      struct CmdBlk **Base;
      struct UnixRup *UnixRupP;
      unsigned long flags;

      if (Rup >= (unsigned short) (MAX_RUP + LINKS_PER_UNIT)) {
            rio_dprintk(RIO_DEBUG_CMD, "Illegal rup number %d in RIOQueueCmdBlk\n", Rup);
            RIOFreeCmdBlk(CmdBlkP);
            return RIO_FAIL;
      }

      UnixRupP = &HostP->UnixRups[Rup];

      rio_spin_lock_irqsave(&UnixRupP->RupLock, flags);

      /*
       ** If the RUP is currently inactive, then put the request
       ** straight on the RUP....
       */
      if ((UnixRupP->CmdsWaitingP == NULL) && (UnixRupP->CmdPendingP == NULL) && (readw(&UnixRupP->RupP->txcontrol) == TX_RUP_INACTIVE) && (CmdBlkP->PreFuncP ? (*CmdBlkP->PreFuncP) (CmdBlkP->PreArg, CmdBlkP)
                                                                                                           : 1)) {
            rio_dprintk(RIO_DEBUG_CMD, "RUP inactive-placing command straight on. Cmd byte is 0x%x\n", CmdBlkP->Packet.data[0]);

            /*
             ** Whammy! blat that pack!
             */
            HostP->Copy(&CmdBlkP->Packet, RIO_PTR(HostP->Caddr, readw(&UnixRupP->RupP->txpkt)), sizeof(struct PKT));

            /*
             ** place command packet on the pending position.
             */
            UnixRupP->CmdPendingP = CmdBlkP;

            /*
             ** set the command register
             */
            writew(TX_PACKET_READY, &UnixRupP->RupP->txcontrol);

            rio_spin_unlock_irqrestore(&UnixRupP->RupLock, flags);

            return 0;
      }
      rio_dprintk(RIO_DEBUG_CMD, "RUP active - en-queing\n");

      if (UnixRupP->CmdsWaitingP != NULL)
            rio_dprintk(RIO_DEBUG_CMD, "Rup active - command waiting\n");
      if (UnixRupP->CmdPendingP != NULL)
            rio_dprintk(RIO_DEBUG_CMD, "Rup active - command pending\n");
      if (readw(&UnixRupP->RupP->txcontrol) != TX_RUP_INACTIVE)
            rio_dprintk(RIO_DEBUG_CMD, "Rup active - command rup not ready\n");

      Base = &UnixRupP->CmdsWaitingP;

      rio_dprintk(RIO_DEBUG_CMD, "First try to queue cmdblk %p at %p\n", CmdBlkP, Base);

      while (*Base) {
            rio_dprintk(RIO_DEBUG_CMD, "Command cmdblk %p here\n", *Base);
            Base = &((*Base)->NextP);
            rio_dprintk(RIO_DEBUG_CMD, "Now try to queue cmd cmdblk %p at %p\n", CmdBlkP, Base);
      }

      rio_dprintk(RIO_DEBUG_CMD, "Will queue cmdblk %p at %p\n", CmdBlkP, Base);

      *Base = CmdBlkP;

      CmdBlkP->NextP = NULL;

      rio_spin_unlock_irqrestore(&UnixRupP->RupLock, flags);

      return 0;
}

/*
** Here we go - if there is an empty rup, fill it!
** must be called at splrio() or higher.
*/
void RIOPollHostCommands(struct rio_info *p, struct Host *HostP)
{
      struct CmdBlk *CmdBlkP;
      struct UnixRup *UnixRupP;
      struct PKT __iomem *PacketP;
      unsigned short Rup;
      unsigned long flags;


      Rup = MAX_RUP + LINKS_PER_UNIT;

      do {              /* do this loop for each RUP */
            /*
             ** locate the rup we are processing & lock it
             */
            UnixRupP = &HostP->UnixRups[--Rup];

            spin_lock_irqsave(&UnixRupP->RupLock, flags);

            /*
             ** First check for incoming commands:
             */
            if (readw(&UnixRupP->RupP->rxcontrol) != RX_RUP_INACTIVE) {
                  int FreeMe;

                  PacketP = (struct PKT __iomem *) RIO_PTR(HostP->Caddr, readw(&UnixRupP->RupP->rxpkt));

                  switch (readb(&PacketP->dest_port)) {
                  case BOOT_RUP:
                        rio_dprintk(RIO_DEBUG_CMD, "Incoming Boot %s packet '%x'\n", readb(&PacketP->len) & 0x80 ? "Command" : "Data", readb(&PacketP->data[0]));
                        rio_spin_unlock_irqrestore(&UnixRupP->RupLock, flags);
                        FreeMe = RIOBootRup(p, Rup, HostP, PacketP);
                        rio_spin_lock_irqsave(&UnixRupP->RupLock, flags);
                        break;

                  case COMMAND_RUP:
                        /*
                         ** Free the RUP lock as loss of carrier causes a
                         ** ttyflush which will (eventually) call another
                         ** routine that uses the RUP lock.
                         */
                        rio_spin_unlock_irqrestore(&UnixRupP->RupLock, flags);
                        FreeMe = RIOCommandRup(p, Rup, HostP, PacketP);
                        if (readb(&PacketP->data[5]) == MEMDUMP) {
                              rio_dprintk(RIO_DEBUG_CMD, "Memdump from 0x%x complete\n", readw(&(PacketP->data[6])));
                              rio_memcpy_fromio(p->RIOMemDump, &(PacketP->data[8]), 32);
                        }
                        rio_spin_lock_irqsave(&UnixRupP->RupLock, flags);
                        break;

                  case ROUTE_RUP:
                        rio_spin_unlock_irqrestore(&UnixRupP->RupLock, flags);
                        FreeMe = RIORouteRup(p, Rup, HostP, PacketP);
                        rio_spin_lock_irqsave(&UnixRupP->RupLock, flags);
                        break;

                  default:
                        rio_dprintk(RIO_DEBUG_CMD, "Unknown RUP %d\n", readb(&PacketP->dest_port));
                        FreeMe = 1;
                        break;
                  }

                  if (FreeMe) {
                        rio_dprintk(RIO_DEBUG_CMD, "Free processed incoming command packet\n");
                        put_free_end(HostP, PacketP);

                        writew(RX_RUP_INACTIVE, &UnixRupP->RupP->rxcontrol);

                        if (readw(&UnixRupP->RupP->handshake) == PHB_HANDSHAKE_SET) {
                              rio_dprintk(RIO_DEBUG_CMD, "Handshake rup %d\n", Rup);
                              writew(PHB_HANDSHAKE_SET | PHB_HANDSHAKE_RESET, &UnixRupP->RupP->handshake);
                        }
                  }
            }

            /*
             ** IF a command was running on the port,
             ** and it has completed, then tidy it up.
             */
            if ((CmdBlkP = UnixRupP->CmdPendingP) &&  /* ASSIGN! */
                (readw(&UnixRupP->RupP->txcontrol) == TX_RUP_INACTIVE)) {
                  /*
                   ** we are idle.
                   ** there is a command in pending.
                   ** Therefore, this command has finished.
                   ** So, wakeup whoever is waiting for it (and tell them
                   ** what happened).
                   */
                  if (CmdBlkP->Packet.dest_port == BOOT_RUP)
                        rio_dprintk(RIO_DEBUG_CMD, "Free Boot %s Command Block '%x'\n", CmdBlkP->Packet.len & 0x80 ? "Command" : "Data", CmdBlkP->Packet.data[0]);

                  rio_dprintk(RIO_DEBUG_CMD, "Command %p completed\n", CmdBlkP);

                  /*
                   ** Clear the Rup lock to prevent mutual exclusion.
                   */
                  if (CmdBlkP->PostFuncP) {
                        rio_spin_unlock_irqrestore(&UnixRupP->RupLock, flags);
                        (*CmdBlkP->PostFuncP) (CmdBlkP->PostArg, CmdBlkP);
                        rio_spin_lock_irqsave(&UnixRupP->RupLock, flags);
                  }

                  /*
                   ** ....clear the pending flag....
                   */
                  UnixRupP->CmdPendingP = NULL;

                  /*
                   ** ....and return the command block to the freelist.
                   */
                  RIOFreeCmdBlk(CmdBlkP);
            }

            /*
             ** If there is a command for this rup, and the rup
             ** is idle, then process the command
             */
            if ((CmdBlkP = UnixRupP->CmdsWaitingP) && /* ASSIGN! */
                (UnixRupP->CmdPendingP == NULL) && (readw(&UnixRupP->RupP->txcontrol) == TX_RUP_INACTIVE)) {
                  /*
                   ** if the pre-function is non-zero, call it.
                   ** If it returns RIO_FAIL then don't
                   ** send this command yet!
                   */
                  if (!(CmdBlkP->PreFuncP ? (*CmdBlkP->PreFuncP) (CmdBlkP->PreArg, CmdBlkP) : 1)) {
                        rio_dprintk(RIO_DEBUG_CMD, "Not ready to start command %p\n", CmdBlkP);
                  } else {
                        rio_dprintk(RIO_DEBUG_CMD, "Start new command %p Cmd byte is 0x%x\n", CmdBlkP, CmdBlkP->Packet.data[0]);
                        /*
                         ** Whammy! blat that pack!
                         */
                        HostP->Copy(&CmdBlkP->Packet, RIO_PTR(HostP->Caddr, readw(&UnixRupP->RupP->txpkt)), sizeof(struct PKT));

                        /*
                         ** remove the command from the rup command queue...
                         */
                        UnixRupP->CmdsWaitingP = CmdBlkP->NextP;

                        /*
                         ** ...and place it on the pending position.
                         */
                        UnixRupP->CmdPendingP = CmdBlkP;

                        /*
                         ** set the command register
                         */
                        writew(TX_PACKET_READY, &UnixRupP->RupP->txcontrol);

                        /*
                         ** the command block will be freed
                         ** when the command has been processed.
                         */
                  }
            }
            spin_unlock_irqrestore(&UnixRupP->RupLock, flags);
      } while (Rup);
}

int RIOWFlushMark(unsigned long iPortP, struct CmdBlk *CmdBlkP)
{
      struct Port *PortP = (struct Port *) iPortP;
      unsigned long flags;

      rio_spin_lock_irqsave(&PortP->portSem, flags);
      PortP->WflushFlag++;
      PortP->MagicFlags |= MAGIC_FLUSH;
      rio_spin_unlock_irqrestore(&PortP->portSem, flags);
      return RIOUnUse(iPortP, CmdBlkP);
}

int RIORFlushEnable(unsigned long iPortP, struct CmdBlk *CmdBlkP)
{
      struct Port *PortP = (struct Port *) iPortP;
      struct PKT __iomem *PacketP;
      unsigned long flags;

      rio_spin_lock_irqsave(&PortP->portSem, flags);

      while (can_remove_receive(&PacketP, PortP)) {
            remove_receive(PortP);
            put_free_end(PortP->HostP, PacketP);
      }

      if (readw(&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_CMD, "Util: Set RX handshake bit\n");
            writew(PHB_HANDSHAKE_SET | PHB_HANDSHAKE_RESET, &PortP->PhbP->handshake);
      }
      rio_spin_unlock_irqrestore(&PortP->portSem, flags);
      return RIOUnUse(iPortP, CmdBlkP);
}

int RIOUnUse(unsigned long iPortP, struct CmdBlk *CmdBlkP)
{
      struct Port *PortP = (struct Port *) iPortP;
      unsigned long flags;

      rio_spin_lock_irqsave(&PortP->portSem, flags);

      rio_dprintk(RIO_DEBUG_CMD, "Decrement in use count for port\n");

      if (PortP->InUse) {
            if (--PortP->InUse != NOT_INUSE) {
                  rio_spin_unlock_irqrestore(&PortP->portSem, flags);
                  return 0;
            }
      }
      /*
       ** While PortP->InUse is set (i.e. a preemptive command has been sent to
       ** the RTA and is awaiting completion), any transmit data is prevented from
       ** being transferred from the write queue into the transmit packets
       ** (add_transmit) and no furthur transmit interrupt will be sent for that
       ** data. The next interrupt will occur up to 500ms later (RIOIntr is called
       ** twice a second as a saftey measure). This was the case when kermit was
       ** used to send data into a RIO port. After each packet was sent, TCFLSH
       ** was called to flush the read queue preemptively. PortP->InUse was
       ** incremented, thereby blocking the 6 byte acknowledgement packet
       ** transmitted back. This acknowledgment hung around for 500ms before
       ** being sent, thus reducing input performance substantially!.
       ** When PortP->InUse becomes NOT_INUSE, we must ensure that any data
       ** hanging around in the transmit buffer is sent immediately.
       */
      writew(1, &PortP->HostP->ParmMapP->tx_intr);
      /* What to do here ..
         wakeup( (caddr_t)&(PortP->InUse) );
       */
      rio_spin_unlock_irqrestore(&PortP->portSem, flags);
      return 0;
}

/*
** 
** How to use this file:
** 
** To send a command down a rup, you need to allocate a command block, fill
** in the packet information, fill in the command number, fill in the pre-
** and post- functions and arguments, and then add the command block to the
** queue of command blocks for the port in question. When the port is idle,
** then the pre-function will be called. If this returns RIO_FAIL then the
** command will be re-queued and tried again at a later date (probably in one
** clock tick). If the pre-function returns NOT RIO_FAIL, then the command
** packet will be queued on the RUP, and the txcontrol field set to the
** command number. When the txcontrol field has changed from being the
** command number, then the post-function will be called, with the argument
** specified earlier, a pointer to the command block, and the value of
** txcontrol.
** 
** To allocate a command block, call RIOGetCmdBlk(). This returns a pointer
** to the command block structure allocated, or NULL if there aren't any.
** The block will have been zeroed for you.
** 
** The structure has the following fields:
** 
** struct CmdBlk
** {
**     struct CmdBlk *NextP;          ** Pointer to next command block   **
**     struct PKT  Packet;          ** A packet, to copy to the rup     **
**                int    (*PreFuncP)();  ** The func to call to check if OK **
**                int    PreArg;          ** The arg for the func             **
**                int    (*PostFuncP)(); ** The func to call when completed **
**                int    PostArg;      ** The arg for the func                **
** };
** 
** You need to fill in ALL fields EXCEPT NextP, which is used to link the
** blocks together either on the free list or on the Rup list.
** 
** Packet is an actual packet structure to be filled in with the packet
** information associated with the command. You need to fill in everything,
** as the command processor doesn't process the command packet in any way.
** 
** The PreFuncP is called before the packet is enqueued on the host rup.
** PreFuncP is called as (*PreFuncP)(PreArg, CmdBlkP);. PreFuncP must
** return !RIO_FAIL to have the packet queued on the rup, and RIO_FAIL
** if the packet is NOT to be queued.
** 
** The PostFuncP is called when the command has completed. It is called
** as (*PostFuncP)(PostArg, CmdBlkP, txcontrol);. PostFuncP is not expected
** to return a value. PostFuncP does NOT need to free the command block,
** as this happens automatically after PostFuncP returns.
** 
** Once the command block has been filled in, it is attached to the correct
** queue by calling RIOQueueCmdBlk( HostP, Rup, CmdBlkP ) where HostP is
** a pointer to the struct Host, Rup is the NUMBER of the rup (NOT a pointer
** to it!), and CmdBlkP is the pointer to the command block allocated using
** RIOGetCmdBlk().
** 
*/

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