drivers/char/rio/riocmd.c

   1 /*
   2 ** -----------------------------------------------------------------------------
   3 **
   4 **  Perle Specialix driver for Linux
   5 **  ported from the existing SCO driver source
   6 **
   7  *
   8  *  (C) 1990 - 2000 Specialix International Ltd., Byfleet, Surrey, UK.
   9  *
  10  *      This program is free software; you can redistribute it and/or modify
  11  *      it under the terms of the GNU General Public License as published by
  12  *      the Free Software Foundation; either version 2 of the License, or
  13  *      (at your option) any later version.
  14  *
  15  *      This program is distributed in the hope that it will be useful,
  16  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *      GNU General Public License for more details.
  19  *
  20  *      You should have received a copy of the GNU General Public License
  21  *      along with this program; if not, write to the Free Software
  22  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23 **
  24 **      Module          : riocmd.c
  25 **      SID             : 1.2
  26 **      Last Modified   : 11/6/98 10:33:41
  27 **      Retrieved       : 11/6/98 10:33:49
  28 **
  29 **  ident @(#)riocmd.c  1.2
  30 **
  31 ** -----------------------------------------------------------------------------
  32 */
  33
  34 #include <linux/module.h>
  35 #include <linux/slab.h>
  36 #include <linux/errno.h>
  37 #include <linux/tty.h>
  38 #include <asm/io.h>
  39 #include <asm/system.h>
  40 #include <asm/string.h>
  41 #include <asm/uaccess.h>
  42
  43 #include <linux/termios.h>
  44 #include <linux/serial.h>
  45
  46 #include <linux/generic_serial.h>
  47
  48 #include "linux_compat.h"
  49 #include "rio_linux.h"
  50 #include "pkt.h"
  51 #include "daemon.h"
  52 #include "rio.h"
  53 #include "riospace.h"
  54 #include "cmdpkt.h"
  55 #include "map.h"
  56 #include "rup.h"
  57 #include "port.h"
  58 #include "riodrvr.h"
  59 #include "rioinfo.h"
  60 #include "func.h"
  61 #include "errors.h"
  62 #include "pci.h"
  63
  64 #include "parmmap.h"
  65 #include "unixrup.h"
  66 #include "board.h"
  67 #include "host.h"
  68 #include "phb.h"
  69 #include "link.h"
  70 #include "cmdblk.h"
  71 #include "route.h"
  72 #include "cirrus.h"
  73
  74
  75 static struct IdentifyRta IdRta;
  76 static struct KillNeighbour KillUnit;
  77
  78 int RIOFoadRta(struct Host *HostP, struct Map *MapP)
  79 {
  80         struct CmdBlk *CmdBlkP;
  81
  82         rio_dprintk(RIO_DEBUG_CMD, "FOAD RTA\n");
  83
  84         CmdBlkP = RIOGetCmdBlk();
  85
  86         if (!CmdBlkP) {
  87                 rio_dprintk(RIO_DEBUG_CMD, "FOAD RTA: GetCmdBlk failed\n");
  88                 return -ENXIO;
  89         }
  90
  91         CmdBlkP->Packet.dest_unit = MapP->ID;
  92         CmdBlkP->Packet.dest_port = BOOT_RUP;
  93         CmdBlkP->Packet.src_unit = 0;
  94         CmdBlkP->Packet.src_port = BOOT_RUP;
  95         CmdBlkP->Packet.len = 0x84;
  96         CmdBlkP->Packet.data[0] = IFOAD;
  97         CmdBlkP->Packet.data[1] = 0;
  98         CmdBlkP->Packet.data[2] = IFOAD_MAGIC & 0xFF;
  99         CmdBlkP->Packet.data[3] = (IFOAD_MAGIC >> 8) & 0xFF;
 100
 101         if (RIOQueueCmdBlk(HostP, MapP->ID - 1, CmdBlkP) == RIO_FAIL) {
 102                 rio_dprintk(RIO_DEBUG_CMD, "FOAD RTA: Failed to queue foad command\n");
 103                 return -EIO;
 104         }
 105         return 0;
 106 }
 107
 108 int RIOZombieRta(struct Host *HostP, struct Map *MapP)
 109 {
 110         struct CmdBlk *CmdBlkP;
 111
 112         rio_dprintk(RIO_DEBUG_CMD, "ZOMBIE RTA\n");
 113
 114         CmdBlkP = RIOGetCmdBlk();
 115
 116         if (!CmdBlkP) {
 117                 rio_dprintk(RIO_DEBUG_CMD, "ZOMBIE RTA: GetCmdBlk failed\n");
 118                 return -ENXIO;
 119         }
 120
 121         CmdBlkP->Packet.dest_unit = MapP->ID;
 122         CmdBlkP->Packet.dest_port = BOOT_RUP;
 123         CmdBlkP->Packet.src_unit = 0;
 124         CmdBlkP->Packet.src_port = BOOT_RUP;
 125         CmdBlkP->Packet.len = 0x84;
 126         CmdBlkP->Packet.data[0] = ZOMBIE;
 127         CmdBlkP->Packet.data[1] = 0;
 128         CmdBlkP->Packet.data[2] = ZOMBIE_MAGIC & 0xFF;
 129         CmdBlkP->Packet.data[3] = (ZOMBIE_MAGIC >> 8) & 0xFF;
 130
 131         if (RIOQueueCmdBlk(HostP, MapP->ID - 1, CmdBlkP) == RIO_FAIL) {
 132                 rio_dprintk(RIO_DEBUG_CMD, "ZOMBIE RTA: Failed to queue zombie command\n");
 133                 return -EIO;
 134         }
 135         return 0;
 136 }
 137
 138 int RIOCommandRta(struct rio_info *p, unsigned long RtaUnique, int (*func) (struct Host * HostP, struct Map * MapP))
 139 {
 140         unsigned int Host;
 141
 142         rio_dprintk(RIO_DEBUG_CMD, "Command RTA 0x%lx func %p\n", RtaUnique, func);
 143
 144         if (!RtaUnique)
 145                 return (0);
 146
 147         for (Host = 0; Host < p->RIONumHosts; Host++) {
 148                 unsigned int Rta;
 149                 struct Host *HostP = &p->RIOHosts[Host];
 150
 151                 for (Rta = 0; Rta < RTAS_PER_HOST; Rta++) {
 152                         struct Map *MapP = &HostP->Mapping[Rta];
 153
 154                         if (MapP->RtaUniqueNum == RtaUnique) {
 155                                 uint Link;
 156
 157                                 /*
 158                                  ** now, lets just check we have a route to it...
 159                                  ** IF the routing stuff is working, then one of the
 160                                  ** topology entries for this unit will have a legit
 161                                  ** route *somewhere*. We care not where - if its got
 162                                  ** any connections, we can get to it.
 163                                  */
 164                                 for (Link = 0; Link < LINKS_PER_UNIT; Link++) {
 165                                         if (MapP->Topology[Link].Unit <= (u8) MAX_RUP) {
 166                                                 /*
 167                                                  ** Its worth trying the operation...
 168                                                  */
 169                                                 return (*func) (HostP, MapP);
 170                                         }
 171                                 }
 172                         }
 173                 }
 174         }
 175         return -ENXIO;
 176 }
 177
 178
 179 int RIOIdentifyRta(struct rio_info *p, void __user * arg)
 180 {
 181         unsigned int Host;
 182
 183         if (copy_from_user(&IdRta, arg, sizeof(IdRta))) {
 184                 rio_dprintk(RIO_DEBUG_CMD, "RIO_IDENTIFY_RTA copy failed\n");
 185                 p->RIOError.Error = COPYIN_FAILED;
 186                 return -EFAULT;
 187         }
 188
 189         for (Host = 0; Host < p->RIONumHosts; Host++) {
 190                 unsigned int Rta;
 191                 struct Host *HostP = &p->RIOHosts[Host];
 192
 193                 for (Rta = 0; Rta < RTAS_PER_HOST; Rta++) {
 194                         struct Map *MapP = &HostP->Mapping[Rta];
 195
 196                         if (MapP->RtaUniqueNum == IdRta.RtaUnique) {
 197                                 uint Link;
 198                                 /*
 199                                  ** now, lets just check we have a route to it...
 200                                  ** IF the routing stuff is working, then one of the
 201                                  ** topology entries for this unit will have a legit
 202                                  ** route *somewhere*. We care not where - if its got
 203                                  ** any connections, we can get to it.
 204                                  */
 205                                 for (Link = 0; Link < LINKS_PER_UNIT; Link++) {
 206                                         if (MapP->Topology[Link].Unit <= (u8) MAX_RUP) {
 207                                                 /*
 208                                                  ** Its worth trying the operation...
 209                                                  */
 210                                                 struct CmdBlk *CmdBlkP;
 211
 212                                                 rio_dprintk(RIO_DEBUG_CMD, "IDENTIFY RTA\n");
 213
 214                                                 CmdBlkP = RIOGetCmdBlk();
 215
 216                                                 if (!CmdBlkP) {
 217                                                         rio_dprintk(RIO_DEBUG_CMD, "IDENTIFY RTA: GetCmdBlk failed\n");
 218                                                         return -ENXIO;
 219                                                 }
 220
 221                                                 CmdBlkP->Packet.dest_unit = MapP->ID;
 222                                                 CmdBlkP->Packet.dest_port = BOOT_RUP;
 223                                                 CmdBlkP->Packet.src_unit = 0;
 224                                                 CmdBlkP->Packet.src_port = BOOT_RUP;
 225                                                 CmdBlkP->Packet.len = 0x84;
 226                                                 CmdBlkP->Packet.data[0] = IDENTIFY;
 227                                                 CmdBlkP->Packet.data[1] = 0;
 228                                                 CmdBlkP->Packet.data[2] = IdRta.ID;
 229
 230                                                 if (RIOQueueCmdBlk(HostP, MapP->ID - 1, CmdBlkP) == RIO_FAIL) {
 231                                                         rio_dprintk(RIO_DEBUG_CMD, "IDENTIFY RTA: Failed to queue command\n");
 232                                                         return -EIO;
 233                                                 }
 234                                                 return 0;
 235                                         }
 236                                 }
 237                         }
 238                 }
 239         }
 240         return -ENOENT;
 241 }
 242
 243
 244 int RIOKillNeighbour(struct rio_info *p, void __user * arg)
 245 {
 246         uint Host;
 247         uint ID;
 248         struct Host *HostP;
 249         struct CmdBlk *CmdBlkP;
 250
 251         rio_dprintk(RIO_DEBUG_CMD, "KILL HOST NEIGHBOUR\n");
 252
 253         if (copy_from_user(&KillUnit, arg, sizeof(KillUnit))) {
 254                 rio_dprintk(RIO_DEBUG_CMD, "RIO_KILL_NEIGHBOUR copy failed\n");
 255                 p->RIOError.Error = COPYIN_FAILED;
 256                 return -EFAULT;
 257         }
 258
 259         if (KillUnit.Link > 3)
 260                 return -ENXIO;
 261
 262         CmdBlkP = RIOGetCmdBlk();
 263
 264         if (!CmdBlkP) {
 265                 rio_dprintk(RIO_DEBUG_CMD, "UFOAD: GetCmdBlk failed\n");
 266                 return -ENXIO;
 267         }
 268
 269         CmdBlkP->Packet.dest_unit = 0;
 270         CmdBlkP->Packet.src_unit = 0;
 271         CmdBlkP->Packet.dest_port = BOOT_RUP;
 272         CmdBlkP->Packet.src_port = BOOT_RUP;
 273         CmdBlkP->Packet.len = 0x84;
 274         CmdBlkP->Packet.data[0] = UFOAD;
 275         CmdBlkP->Packet.data[1] = KillUnit.Link;
 276         CmdBlkP->Packet.data[2] = UFOAD_MAGIC & 0xFF;
 277         CmdBlkP->Packet.data[3] = (UFOAD_MAGIC >> 8) & 0xFF;
 278
 279         for (Host = 0; Host < p->RIONumHosts; Host++) {
 280                 ID = 0;
 281                 HostP = &p->RIOHosts[Host];
 282
 283                 if (HostP->UniqueNum == KillUnit.UniqueNum) {
 284                         if (RIOQueueCmdBlk(HostP, RTAS_PER_HOST + KillUnit.Link, CmdBlkP) == RIO_FAIL) {
 285                                 rio_dprintk(RIO_DEBUG_CMD, "UFOAD: Failed queue command\n");
 286                                 return -EIO;
 287                         }
 288                         return 0;
 289                 }
 290
 291                 for (ID = 0; ID < RTAS_PER_HOST; ID++) {
 292                         if (HostP->Mapping[ID].RtaUniqueNum == KillUnit.UniqueNum) {
 293                                 CmdBlkP->Packet.dest_unit = ID + 1;
 294                                 if (RIOQueueCmdBlk(HostP, ID, CmdBlkP) == RIO_FAIL) {
 295                                         rio_dprintk(RIO_DEBUG_CMD, "UFOAD: Failed queue command\n");
 296                                         return -EIO;
 297                                 }
 298                                 return 0;
 299                         }
 300                 }
 301         }
 302         RIOFreeCmdBlk(CmdBlkP);
 303         return -ENXIO;
 304 }
 305
 306 int RIOSuspendBootRta(struct Host *HostP, int ID, int Link)
 307 {
 308         struct CmdBlk *CmdBlkP;
 309
 310         rio_dprintk(RIO_DEBUG_CMD, "SUSPEND BOOT ON RTA ID %d, link %c\n", ID, 'A' + Link);
 311
 312         CmdBlkP = RIOGetCmdBlk();
 313
 314         if (!CmdBlkP) {
 315                 rio_dprintk(RIO_DEBUG_CMD, "SUSPEND BOOT ON RTA: GetCmdBlk failed\n");
 316                 return -ENXIO;
 317         }
 318
 319         CmdBlkP->Packet.dest_unit = ID;
 320         CmdBlkP->Packet.dest_port = BOOT_RUP;
 321         CmdBlkP->Packet.src_unit = 0;
 322         CmdBlkP->Packet.src_port = BOOT_RUP;
 323         CmdBlkP->Packet.len = 0x84;
 324         CmdBlkP->Packet.data[0] = IWAIT;
 325         CmdBlkP->Packet.data[1] = Link;
 326         CmdBlkP->Packet.data[2] = IWAIT_MAGIC & 0xFF;
 327         CmdBlkP->Packet.data[3] = (IWAIT_MAGIC >> 8) & 0xFF;
 328
 329         if (RIOQueueCmdBlk(HostP, ID - 1, CmdBlkP) == RIO_FAIL) {
 330                 rio_dprintk(RIO_DEBUG_CMD, "SUSPEND BOOT ON RTA: Failed to queue iwait command\n");
 331                 return -EIO;
 332         }
 333         return 0;
 334 }
 335
 336 int RIOFoadWakeup(struct rio_info *p)
 337 {
 338         int port;
 339         struct Port *PortP;
 340         unsigned long flags;
 341
 342         for (port = 0; port < RIO_PORTS; port++) {
 343                 PortP = p->RIOPortp[port];
 344
 345                 rio_spin_lock_irqsave(&PortP->portSem, flags);
 346                 PortP->Config = 0;
 347                 PortP->State = 0;
 348                 PortP->InUse = NOT_INUSE;
 349                 PortP->PortState = 0;
 350                 PortP->FlushCmdBodge = 0;
 351                 PortP->ModemLines = 0;
 352                 PortP->ModemState = 0;
 353                 PortP->CookMode = 0;
 354                 PortP->ParamSem = 0;
 355                 PortP->Mapped = 0;
 356                 PortP->WflushFlag = 0;
 357                 PortP->MagicFlags = 0;
 358                 PortP->RxDataStart = 0;
 359                 PortP->TxBufferIn = 0;
 360                 PortP->TxBufferOut = 0;
 361                 rio_spin_unlock_irqrestore(&PortP->portSem, flags);
 362         }
 363         return (0);
 364 }
 365
 366 /*
 367 ** Incoming command on the COMMAND_RUP to be processed.
 368 */
 369 static int RIOCommandRup(struct rio_info *p, uint Rup, struct Host *HostP, struct PKT __iomem *PacketP)
 370 {
 371         struct PktCmd __iomem *PktCmdP = (struct PktCmd __iomem *)PacketP->data;
 372         struct Port *PortP;
 373         struct UnixRup *UnixRupP;
 374         unsigned short SysPort;
 375         unsigned short ReportedModemStatus;
 376         unsigned short rup;
 377         unsigned short subCommand;
 378         unsigned long flags;
 379
 380         func_enter();
 381
 382         /*
 383          ** 16 port RTA note:
 384          ** Command rup packets coming from the RTA will have pkt->data[1] (which
 385          ** translates to PktCmdP->PhbNum) set to the host port number for the
 386          ** particular unit. To access the correct BaseSysPort for a 16 port RTA,
 387          ** we can use PhbNum to get the rup number for the appropriate 8 port
 388          ** block (for the first block, this should be equal to 'Rup').
 389          */
 390         rup = readb(&PktCmdP->PhbNum) / (unsigned short) PORTS_PER_RTA;
 391         UnixRupP = &HostP->UnixRups[rup];
 392         SysPort = UnixRupP->BaseSysPort + (readb(&PktCmdP->PhbNum) % (unsigned short) PORTS_PER_RTA);
 393         rio_dprintk(RIO_DEBUG_CMD, "Command on rup %d, port %d\n", rup, SysPort);
 394
 395         if (UnixRupP->BaseSysPort == NO_PORT) {
 396                 rio_dprintk(RIO_DEBUG_CMD, "OBSCURE ERROR!\n");
 397                 rio_dprintk(RIO_DEBUG_CMD, "Diagnostics follow. Please WRITE THESE DOWN and report them to Specialix Technical Support\n");
 398                 rio_dprintk(RIO_DEBUG_CMD, "CONTROL information: Host number %Zd, name ``%s''\n", HostP - p->RIOHosts, HostP->Name);
 399                 rio_dprintk(RIO_DEBUG_CMD, "CONTROL information: Rup number  0x%x\n", rup);
 400
 401                 if (Rup < (unsigned short) MAX_RUP) {
 402                         rio_dprintk(RIO_DEBUG_CMD, "CONTROL information: This is the RUP for RTA ``%s''\n", HostP->Mapping[Rup].Name);
 403                 } else
 404                         rio_dprintk(RIO_DEBUG_CMD, "CONTROL information: This is the RUP for link ``%c'' of host ``%s''\n", ('A' + Rup - MAX_RUP), HostP->Name);
 405
 406                 rio_dprintk(RIO_DEBUG_CMD, "PACKET information: Destination 0x%x:0x%x\n", readb(&PacketP->dest_unit), readb(&PacketP->dest_port));
 407                 rio_dprintk(RIO_DEBUG_CMD, "PACKET information: Source    0x%x:0x%x\n", readb(&PacketP->src_unit), readb(&PacketP->src_port));
 408                 rio_dprintk(RIO_DEBUG_CMD, "PACKET information: Length    0x%x (%d)\n", readb(&PacketP->len), readb(&PacketP->len));
 409                 rio_dprintk(RIO_DEBUG_CMD, "PACKET information: Control  0x%x (%d)\n", readb(&PacketP->control), readb(&PacketP->control));
 410                 rio_dprintk(RIO_DEBUG_CMD, "PACKET information: Check      0x%x (%d)\n", readw(&PacketP->csum), readw(&PacketP->csum));
 411                 rio_dprintk(RIO_DEBUG_CMD, "COMMAND information: Host Port Number 0x%x, " "Command Code 0x%x\n", readb(&PktCmdP->PhbNum), readb(&PktCmdP->Command));
 412                 return 1;
 413         }
 414         PortP = p->RIOPortp[SysPort];
 415         rio_spin_lock_irqsave(&PortP->portSem, flags);
 416         switch (readb(&PktCmdP->Command)) {
 417         case RIOC_BREAK_RECEIVED:
 418                 rio_dprintk(RIO_DEBUG_CMD, "Received a break!\n");
 419                 /* If the current line disc. is not multi-threading and
 420                    the current processor is not the default, reset rup_intr
 421                    and return 0 to ensure that the command packet is
 422                    not freed. */
 423                 /* Call tmgr HANGUP HERE */
 424                 /* Fix this later when every thing works !!!! RAMRAJ */
 425                 gs_got_break(&PortP->gs);
 426                 break;
 427
 428         case RIOC_COMPLETE:
 429                 rio_dprintk(RIO_DEBUG_CMD, "Command complete on phb %d host %Zd\n", readb(&PktCmdP->PhbNum), HostP - p->RIOHosts);
 430                 subCommand = 1;
 431                 switch (readb(&PktCmdP->SubCommand)) {
 432                 case RIOC_MEMDUMP:
 433                         rio_dprintk(RIO_DEBUG_CMD, "Memory dump cmd (0x%x) from addr 0x%x\n", readb(&PktCmdP->SubCommand), readw(&PktCmdP->SubAddr));
 434                         break;
 435                 case RIOC_READ_REGISTER:
 436                         rio_dprintk(RIO_DEBUG_CMD, "Read register (0x%x)\n", readw(&PktCmdP->SubAddr));
 437                         p->CdRegister = (readb(&PktCmdP->ModemStatus) & RIOC_MSVR1_HOST);
 438                         break;
 439                 default:
 440                         subCommand = 0;
 441                         break;
 442                 }
 443                 if (subCommand)
 444                         break;
 445                 rio_dprintk(RIO_DEBUG_CMD, "New status is 0x%x was 0x%x\n", readb(&PktCmdP->PortStatus), PortP->PortState);
 446                 if (PortP->PortState != readb(&PktCmdP->PortStatus)) {
 447                         rio_dprintk(RIO_DEBUG_CMD, "Mark status & wakeup\n");
 448                         PortP->PortState = readb(&PktCmdP->PortStatus);
 449                         /* What should we do here ...
 450                            wakeup( &PortP->PortState );
 451                          */
 452                 } else
 453                         rio_dprintk(RIO_DEBUG_CMD, "No change\n");
 454
 455                 /* FALLTHROUGH */
 456         case RIOC_MODEM_STATUS:
 457                 /*
 458                  ** Knock out the tbusy and tstop bits, as these are not relevant
 459                  ** to the check for modem status change (they're just there because
 460                  ** it's a convenient place to put them!).
 461                  */
 462                 ReportedModemStatus = readb(&PktCmdP->ModemStatus);
 463                 if ((PortP->ModemState & RIOC_MSVR1_HOST) ==
 464                                 (ReportedModemStatus & RIOC_MSVR1_HOST)) {
 465                         rio_dprintk(RIO_DEBUG_CMD, "Modem status unchanged 0x%x\n", PortP->ModemState);
 466                         /*
 467                          ** Update ModemState just in case tbusy or tstop states have
 468                          ** changed.
 469                          */
 470                         PortP->ModemState = ReportedModemStatus;
 471                 } else {
 472                         rio_dprintk(RIO_DEBUG_CMD, "Modem status change from 0x%x to 0x%x\n", PortP->ModemState, ReportedModemStatus);
 473                         PortP->ModemState = ReportedModemStatus;
 474 #ifdef MODEM_SUPPORT
 475                         if (PortP->Mapped) {
 476                                 /***********************************************************\
 477                                 *************************************************************
 478                                 ***                                                                                                        ***
 479                                 ***               M O D E M   S T A T E   C H A N G E             ***
 480                                 ***                                                                                                        ***
 481                                 *************************************************************
 482                                 \***********************************************************/
 483                                 /*
 484                                  ** If the device is a modem, then check the modem
 485                                  ** carrier.
 486                                  */
 487                                 if (PortP->gs.port.tty == NULL)
 488                                         break;
 489                                 if (PortP->gs.port.tty->termios == NULL)
 490                                         break;
 491
 492                                 if (!(PortP->gs.port.tty->termios->c_cflag & CLOCAL) && ((PortP->State & (RIO_MOPEN | RIO_WOPEN)))) {
 493
 494                                         rio_dprintk(RIO_DEBUG_CMD, "Is there a Carrier?\n");
 495                                         /*
 496                                          ** Is there a carrier?
 497                                          */
 498                                         if (PortP->ModemState & RIOC_MSVR1_CD) {
 499                                                 /*
 500                                                  ** Has carrier just appeared?
 501                                                  */
 502                                                 if (!(PortP->State & RIO_CARR_ON)) {
 503                                                         rio_dprintk(RIO_DEBUG_CMD, "Carrier just came up.\n");
 504                                                         PortP->State |= RIO_CARR_ON;
 505                                                         /*
 506                                                          ** wakeup anyone in WOPEN
 507                                                          */
 508                                                         if (PortP->State & (PORT_ISOPEN | RIO_WOPEN))
 509                                                                 wake_up_interruptible(&PortP->gs.port.open_wait);
 510                                                 }
 511                                         } else {
 512                                                 /*
 513                                                  ** Has carrier just dropped?
 514                                                  */
 515                                                 if (PortP->State & RIO_CARR_ON) {
 516                                                         if (PortP->State & (PORT_ISOPEN | RIO_WOPEN | RIO_MOPEN))
 517                                                                 tty_hangup(PortP->gs.port.tty);
 518                                                         PortP->State &= ~RIO_CARR_ON;
 519                                                         rio_dprintk(RIO_DEBUG_CMD, "Carrirer just went down\n");
 520                                                 }
 521                                         }
 522                                 }
 523                         }
 524 #endif
 525                 }
 526                 break;
 527
 528         default:
 529                 rio_dprintk(RIO_DEBUG_CMD, "Unknown command %d on CMD_RUP of host %Zd\n", readb(&PktCmdP->Command), HostP - p->RIOHosts);
 530                 break;
 531         }
 532         rio_spin_unlock_irqrestore(&PortP->portSem, flags);
 533
 534         func_exit();
 535
 536         return 1;
 537 }
 538
 539 /*
 540 ** The command mechanism:
 541 **      Each rup has a chain of commands associated with it.
 542 **      This chain is maintained by routines in this file.
 543 **      Periodically we are called and we run a quick check of all the
 544 **      active chains to determine if there is a command to be executed,
 545 **      and if the rup is ready to accept it.
 546 **
 547 */
 548
 549 /*
 550 ** Allocate an empty command block.
 551 */
 552 struct CmdBlk *RIOGetCmdBlk(void)
 553 {
 554         struct CmdBlk *CmdBlkP;
 555
 556         CmdBlkP = kzalloc(sizeof(struct CmdBlk), GFP_ATOMIC);
 557         return CmdBlkP;
 558 }
 559
 560 /*
 561 ** Return a block to the head of the free list.
 562 */
 563 void RIOFreeCmdBlk(struct CmdBlk *CmdBlkP)
 564 {
 565         kfree(CmdBlkP);
 566 }
 567
 568 /*
 569 ** attach a command block to the list of commands to be performed for
 570 ** a given rup.
 571 */
 572 int RIOQueueCmdBlk(struct Host *HostP, uint Rup, struct CmdBlk *CmdBlkP)
 573 {
 574         struct CmdBlk **Base;
 575         struct UnixRup *UnixRupP;
 576         unsigned long flags;
 577
 578         if (Rup >= (unsigned short) (MAX_RUP + LINKS_PER_UNIT)) {
 579                 rio_dprintk(RIO_DEBUG_CMD, "Illegal rup number %d in RIOQueueCmdBlk\n", Rup);
 580                 RIOFreeCmdBlk(CmdBlkP);
 581                 return RIO_FAIL;
 582         }
 583
 584         UnixRupP = &HostP->UnixRups[Rup];
 585
 586         rio_spin_lock_irqsave(&UnixRupP->RupLock, flags);
 587
 588         /*
 589          ** If the RUP is currently inactive, then put the request
 590          ** straight on the RUP....
 591          */
 592         if ((UnixRupP->CmdsWaitingP == NULL) && (UnixRupP->CmdPendingP == NULL) && (readw(&UnixRupP->RupP->txcontrol) == TX_RUP_INACTIVE) && (CmdBlkP->PreFuncP ? (*CmdBlkP->PreFuncP) (CmdBlkP->PreArg, CmdBlkP)
 593                                                                                                                                              : 1)) {
 594                 rio_dprintk(RIO_DEBUG_CMD, "RUP inactive-placing command straight on. Cmd byte is 0x%x\n", CmdBlkP->Packet.data[0]);
 595
 596                 /*
 597                  ** Whammy! blat that pack!
 598                  */
 599                 HostP->Copy(&CmdBlkP->Packet, RIO_PTR(HostP->Caddr, readw(&UnixRupP->RupP->txpkt)), sizeof(struct PKT));
 600
 601                 /*
 602                  ** place command packet on the pending position.
 603                  */
 604                 UnixRupP->CmdPendingP = CmdBlkP;
 605
 606                 /*
 607                  ** set the command register
 608                  */
 609                 writew(TX_PACKET_READY, &UnixRupP->RupP->txcontrol);
 610
 611                 rio_spin_unlock_irqrestore(&UnixRupP->RupLock, flags);
 612
 613                 return 0;
 614         }
 615         rio_dprintk(RIO_DEBUG_CMD, "RUP active - en-queing\n");
 616
 617         if (UnixRupP->CmdsWaitingP != NULL)
 618                 rio_dprintk(RIO_DEBUG_CMD, "Rup active - command waiting\n");
 619         if (UnixRupP->CmdPendingP != NULL)
 620                 rio_dprintk(RIO_DEBUG_CMD, "Rup active - command pending\n");
 621         if (readw(&UnixRupP->RupP->txcontrol) != TX_RUP_INACTIVE)
 622                 rio_dprintk(RIO_DEBUG_CMD, "Rup active - command rup not ready\n");
 623
 624         Base = &UnixRupP->CmdsWaitingP;
 625
 626         rio_dprintk(RIO_DEBUG_CMD, "First try to queue cmdblk %p at %p\n", CmdBlkP, Base);
 627
 628         while (*Base) {
 629                 rio_dprintk(RIO_DEBUG_CMD, "Command cmdblk %p here\n", *Base);
 630                 Base = &((*Base)->NextP);
 631                 rio_dprintk(RIO_DEBUG_CMD, "Now try to queue cmd cmdblk %p at %p\n", CmdBlkP, Base);
 632         }
 633
 634         rio_dprintk(RIO_DEBUG_CMD, "Will queue cmdblk %p at %p\n", CmdBlkP, Base);
 635
 636         *Base = CmdBlkP;
 637
 638         CmdBlkP->NextP = NULL;
 639
 640         rio_spin_unlock_irqrestore(&UnixRupP->RupLock, flags);
 641
 642         return 0;
 643 }
 644
 645 /*
 646 ** Here we go - if there is an empty rup, fill it!
 647 ** must be called at splrio() or higher.
 648 */
 649 void RIOPollHostCommands(struct rio_info *p, struct Host *HostP)
 650 {
 651         struct CmdBlk *CmdBlkP;
 652         struct UnixRup *UnixRupP;
 653         struct PKT __iomem *PacketP;
 654         unsigned short Rup;
 655         unsigned long flags;
 656
 657
 658         Rup = MAX_RUP + LINKS_PER_UNIT;
 659
 660         do {                    /* do this loop for each RUP */
 661                 /*
 662                  ** locate the rup we are processing & lock it
 663                  */
 664                 UnixRupP = &HostP->UnixRups[--Rup];
 665
 666                 spin_lock_irqsave(&UnixRupP->RupLock, flags);
 667
 668                 /*
 669                  ** First check for incoming commands:
 670                  */
 671                 if (readw(&UnixRupP->RupP->rxcontrol) != RX_RUP_INACTIVE) {
 672                         int FreeMe;
 673
 674                         PacketP = (struct PKT __iomem *) RIO_PTR(HostP->Caddr, readw(&UnixRupP->RupP->rxpkt));
 675
 676                         switch (readb(&PacketP->dest_port)) {
 677                         case BOOT_RUP:
 678                                 rio_dprintk(RIO_DEBUG_CMD, "Incoming Boot %s packet '%x'\n", readb(&PacketP->len) & 0x80 ? "Command" : "Data", readb(&PacketP->data[0]));
 679                                 rio_spin_unlock_irqrestore(&UnixRupP->RupLock, flags);
 680                                 FreeMe = RIOBootRup(p, Rup, HostP, PacketP);
 681                                 rio_spin_lock_irqsave(&UnixRupP->RupLock, flags);
 682                                 break;
 683
 684                         case COMMAND_RUP:
 685                                 /*
 686                                  ** Free the RUP lock as loss of carrier causes a
 687                                  ** ttyflush which will (eventually) call another
 688                                  ** routine that uses the RUP lock.
 689                                  */
 690                                 rio_spin_unlock_irqrestore(&UnixRupP->RupLock, flags);
 691                                 FreeMe = RIOCommandRup(p, Rup, HostP, PacketP);
 692                                 if (readb(&PacketP->data[5]) == RIOC_MEMDUMP) {
 693                                         rio_dprintk(RIO_DEBUG_CMD, "Memdump from 0x%x complete\n", readw(&(PacketP->data[6])));
 694                                         rio_memcpy_fromio(p->RIOMemDump, &(PacketP->data[8]), 32);
 695                                 }
 696                                 rio_spin_lock_irqsave(&UnixRupP->RupLock, flags);
 697                                 break;
 698
 699                         case ROUTE_RUP:
 700                                 rio_spin_unlock_irqrestore(&UnixRupP->RupLock, flags);
 701                                 FreeMe = RIORouteRup(p, Rup, HostP, PacketP);
 702                                 rio_spin_lock_irqsave(&UnixRupP->RupLock, flags);
 703                                 break;
 704
 705                         default:
 706                                 rio_dprintk(RIO_DEBUG_CMD, "Unknown RUP %d\n", readb(&PacketP->dest_port));
 707                                 FreeMe = 1;
 708                                 break;
 709                         }
 710
 711                         if (FreeMe) {
 712                                 rio_dprintk(RIO_DEBUG_CMD, "Free processed incoming command packet\n");
 713                                 put_free_end(HostP, PacketP);
 714
 715                                 writew(RX_RUP_INACTIVE, &UnixRupP->RupP->rxcontrol);
 716
 717                                 if (readw(&UnixRupP->RupP->handshake) == PHB_HANDSHAKE_SET) {
 718                                         rio_dprintk(RIO_DEBUG_CMD, "Handshake rup %d\n", Rup);
 719                                         writew(PHB_HANDSHAKE_SET | PHB_HANDSHAKE_RESET, &UnixRupP->RupP->handshake);
 720                                 }
 721                         }
 722                 }
 723
 724                 /*
 725                  ** IF a command was running on the port,
 726                  ** and it has completed, then tidy it up.
 727                  */
 728                 if ((CmdBlkP = UnixRupP->CmdPendingP) &&        /* ASSIGN! */
 729                     (readw(&UnixRupP->RupP->txcontrol) == TX_RUP_INACTIVE)) {
 730                         /*
 731                          ** we are idle.
 732                          ** there is a command in pending.
 733                          ** Therefore, this command has finished.
 734                          ** So, wakeup whoever is waiting for it (and tell them
 735                          ** what happened).
 736                          */
 737                         if (CmdBlkP->Packet.dest_port == BOOT_RUP)
 738                                 rio_dprintk(RIO_DEBUG_CMD, "Free Boot %s Command Block '%x'\n", CmdBlkP->Packet.len & 0x80 ? "Command" : "Data", CmdBlkP->Packet.data[0]);
 739
 740                         rio_dprintk(RIO_DEBUG_CMD, "Command %p completed\n", CmdBlkP);
 741
 742                         /*
 743                          ** Clear the Rup lock to prevent mutual exclusion.
 744                          */
 745                         if (CmdBlkP->PostFuncP) {
 746                                 rio_spin_unlock_irqrestore(&UnixRupP->RupLock, flags);
 747                                 (*CmdBlkP->PostFuncP) (CmdBlkP->PostArg, CmdBlkP);
 748                                 rio_spin_lock_irqsave(&UnixRupP->RupLock, flags);
 749                         }
 750
 751                         /*
 752                          ** ....clear the pending flag....
 753                          */
 754                         UnixRupP->CmdPendingP = NULL;
 755
 756                         /*
 757                          ** ....and return the command block to the freelist.
 758                          */
 759                         RIOFreeCmdBlk(CmdBlkP);
 760                 }
 761
 762                 /*
 763                  ** If there is a command for this rup, and the rup
 764                  ** is idle, then process the command
 765                  */
 766                 if ((CmdBlkP = UnixRupP->CmdsWaitingP) &&       /* ASSIGN! */
 767                     (UnixRupP->CmdPendingP == NULL) && (readw(&UnixRupP->RupP->txcontrol) == TX_RUP_INACTIVE)) {
 768                         /*
 769                          ** if the pre-function is non-zero, call it.
 770                          ** If it returns RIO_FAIL then don't
 771                          ** send this command yet!
 772                          */
 773                         if (!(CmdBlkP->PreFuncP ? (*CmdBlkP->PreFuncP) (CmdBlkP->PreArg, CmdBlkP) : 1)) {
 774                                 rio_dprintk(RIO_DEBUG_CMD, "Not ready to start command %p\n", CmdBlkP);
 775                         } else {
 776                                 rio_dprintk(RIO_DEBUG_CMD, "Start new command %p Cmd byte is 0x%x\n", CmdBlkP, CmdBlkP->Packet.data[0]);
 777                                 /*
 778                                  ** Whammy! blat that pack!
 779                                  */
 780                                 HostP->Copy(&CmdBlkP->Packet, RIO_PTR(HostP->Caddr, readw(&UnixRupP->RupP->txpkt)), sizeof(struct PKT));
 781
 782                                 /*
 783                                  ** remove the command from the rup command queue...
 784                                  */
 785                                 UnixRupP->CmdsWaitingP = CmdBlkP->NextP;
 786
 787                                 /*
 788                                  ** ...and place it on the pending position.
 789                                  */
 790                                 UnixRupP->CmdPendingP = CmdBlkP;
 791
 792                                 /*
 793                                  ** set the command register
 794                                  */
 795                                 writew(TX_PACKET_READY, &UnixRupP->RupP->txcontrol);
 796
 797                                 /*
 798                                  ** the command block will be freed
 799                                  ** when the command has been processed.
 800                                  */
 801                         }
 802                 }
 803                 spin_unlock_irqrestore(&UnixRupP->RupLock, flags);
 804         } while (Rup);
 805 }
 806
 807 int RIOWFlushMark(unsigned long iPortP, struct CmdBlk *CmdBlkP)
 808 {
 809         struct Port *PortP = (struct Port *) iPortP;
 810         unsigned long flags;
 811
 812         rio_spin_lock_irqsave(&PortP->portSem, flags);
 813         PortP->WflushFlag++;
 814         PortP->MagicFlags |= MAGIC_FLUSH;
 815         rio_spin_unlock_irqrestore(&PortP->portSem, flags);
 816         return RIOUnUse(iPortP, CmdBlkP);
 817 }
 818
 819 int RIORFlushEnable(unsigned long iPortP, struct CmdBlk *CmdBlkP)
 820 {
 821         struct Port *PortP = (struct Port *) iPortP;
 822         struct PKT __iomem *PacketP;
 823         unsigned long flags;
 824
 825         rio_spin_lock_irqsave(&PortP->portSem, flags);
 826
 827         while (can_remove_receive(&PacketP, PortP)) {
 828                 remove_receive(PortP);
 829                 put_free_end(PortP->HostP, PacketP);
 830         }
 831
 832         if (readw(&PortP->PhbP->handshake) == PHB_HANDSHAKE_SET) {
 833                 /*
 834                  ** MAGIC! (Basically, handshake the RX buffer, so that
 835                  ** the RTAs upstream can be re-enabled.)
 836                  */
 837                 rio_dprintk(RIO_DEBUG_CMD, "Util: Set RX handshake bit\n");
 838                 writew(PHB_HANDSHAKE_SET | PHB_HANDSHAKE_RESET, &PortP->PhbP->handshake);
 839         }
 840         rio_spin_unlock_irqrestore(&PortP->portSem, flags);
 841         return RIOUnUse(iPortP, CmdBlkP);
 842 }
 843
 844 int RIOUnUse(unsigned long iPortP, struct CmdBlk *CmdBlkP)
 845 {
 846         struct Port *PortP = (struct Port *) iPortP;
 847         unsigned long flags;
 848
 849         rio_spin_lock_irqsave(&PortP->portSem, flags);
 850
 851         rio_dprintk(RIO_DEBUG_CMD, "Decrement in use count for port\n");
 852
 853         if (PortP->InUse) {
 854                 if (--PortP->InUse != NOT_INUSE) {
 855                         rio_spin_unlock_irqrestore(&PortP->portSem, flags);
 856                         return 0;
 857                 }
 858         }
 859         /*
 860          ** While PortP->InUse is set (i.e. a preemptive command has been sent to
 861          ** the RTA and is awaiting completion), any transmit data is prevented from
 862          ** being transferred from the write queue into the transmit packets
 863          ** (add_transmit) and no furthur transmit interrupt will be sent for that
 864          ** data. The next interrupt will occur up to 500ms later (RIOIntr is called
 865          ** twice a second as a saftey measure). This was the case when kermit was
 866          ** used to send data into a RIO port. After each packet was sent, TCFLSH
 867          ** was called to flush the read queue preemptively. PortP->InUse was
 868          ** incremented, thereby blocking the 6 byte acknowledgement packet
 869          ** transmitted back. This acknowledgment hung around for 500ms before
 870          ** being sent, thus reducing input performance substantially!.
 871          ** When PortP->InUse becomes NOT_INUSE, we must ensure that any data
 872          ** hanging around in the transmit buffer is sent immediately.
 873          */
 874         writew(1, &PortP->HostP->ParmMapP->tx_intr);
 875         /* What to do here ..
 876            wakeup( (caddr_t)&(PortP->InUse) );
 877          */
 878         rio_spin_unlock_irqrestore(&PortP->portSem, flags);
 879         return 0;
 880 }
 881
 882 /*
 883 **
 884 ** How to use this file:
 885 **
 886 ** To send a command down a rup, you need to allocate a command block, fill
 887 ** in the packet information, fill in the command number, fill in the pre-
 888 ** and post- functions and arguments, and then add the command block to the
 889 ** queue of command blocks for the port in question. When the port is idle,
 890 ** then the pre-function will be called. If this returns RIO_FAIL then the
 891 ** command will be re-queued and tried again at a later date (probably in one
 892 ** clock tick). If the pre-function returns NOT RIO_FAIL, then the command
 893 ** packet will be queued on the RUP, and the txcontrol field set to the
 894 ** command number. When the txcontrol field has changed from being the
 895 ** command number, then the post-function will be called, with the argument
 896 ** specified earlier, a pointer to the command block, and the value of
 897 ** txcontrol.
 898 **
 899 ** To allocate a command block, call RIOGetCmdBlk(). This returns a pointer
 900 ** to the command block structure allocated, or NULL if there aren't any.
 901 ** The block will have been zeroed for you.
 902 **
 903 ** The structure has the following fields:
 904 **
 905 ** struct CmdBlk
 906 ** {
 907 **       struct CmdBlk *NextP;            ** Pointer to next command block   **
 908 **       struct PKT      Packet;                ** A packet, to copy to the rup **
 909 **                      int      (*PreFuncP)();  ** The func to call to check if OK **
 910 **                      int      PreArg;                ** The arg for the func                 **
 911 **                      int      (*PostFuncP)(); ** The func to call when completed **
 912 **                      int      PostArg;          ** The arg for the func                      **
 913 ** };
 914 **
 915 ** You need to fill in ALL fields EXCEPT NextP, which is used to link the
 916 ** blocks together either on the free list or on the Rup list.
 917 **
 918 ** Packet is an actual packet structure to be filled in with the packet
 919 ** information associated with the command. You need to fill in everything,
 920 ** as the command processor doesn't process the command packet in any way.
 921 **
 922 ** The PreFuncP is called before the packet is enqueued on the host rup.
 923 ** PreFuncP is called as (*PreFuncP)(PreArg, CmdBlkP);. PreFuncP must
 924 ** return !RIO_FAIL to have the packet queued on the rup, and RIO_FAIL
 925 ** if the packet is NOT to be queued.
 926 **
 927 ** The PostFuncP is called when the command has completed. It is called
 928 ** as (*PostFuncP)(PostArg, CmdBlkP, txcontrol);. PostFuncP is not expected
 929 ** to return a value. PostFuncP does NOT need to free the command block,
 930 ** as this happens automatically after PostFuncP returns.
 931 **
 932 ** Once the command block has been filled in, it is attached to the correct
 933 ** queue by calling RIOQueueCmdBlk( HostP, Rup, CmdBlkP ) where HostP is
 934 ** a pointer to the struct Host, Rup is the NUMBER of the rup (NOT a pointer
 935 ** to it!), and CmdBlkP is the pointer to the command block allocated using
 936 ** RIOGetCmdBlk().
 937 **
 938 */