git.oblomov.eu Git - linux-2.6/blob - drivers/char/rio/riointr.c

   1 /*
   2 ** -----------------------------------------------------------------------------
   3 **
   4 **  Perle Specialix driver for Linux
   5 **  Ported from existing RIO Driver for SCO sources.
   6  *
   7  *  (C) 1990 - 2000 Specialix International Ltd., Byfleet, Surrey, UK.
   8  *
   9  *      This program is free software; you can redistribute it and/or modify
  10  *      it under the terms of the GNU General Public License as published by
  11  *      the Free Software Foundation; either version 2 of the License, or
  12  *      (at your option) any later version.
  13  *
  14  *      This program is distributed in the hope that it will be useful,
  15  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *      GNU General Public License for more details.
  18  *
  19  *      You should have received a copy of the GNU General Public License
  20  *      along with this program; if not, write to the Free Software
  21  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 **
  23 **      Module          : riointr.c
  24 **      SID             : 1.2
  25 **      Last Modified   : 11/6/98 10:33:44
  26 **      Retrieved       : 11/6/98 10:33:49
  27 **
  28 **  ident @(#)riointr.c 1.2
  29 **
  30 ** -----------------------------------------------------------------------------
  31 */
  32 #ifdef SCCS_LABELS
  33 static char *_riointr_c_sccs_ = "@(#)riointr.c  1.2";
  34 #endif
  35
  36
  37 #include <linux/module.h>
  38 #include <linux/slab.h>
  39 #include <linux/errno.h>
  40 #include <linux/tty.h>
  41 #include <linux/tty_flip.h>
  42 #include <asm/io.h>
  43 #include <asm/system.h>
  44 #include <asm/string.h>
  45 #include <asm/semaphore.h>
  46 #include <asm/uaccess.h>
  47
  48 #include <linux/termios.h>
  49 #include <linux/serial.h>
  50
  51 #include <linux/generic_serial.h>
  52
  53 #include <linux/delay.h>
  54
  55 #include "linux_compat.h"
  56 #include "rio_linux.h"
  57 #include "typdef.h"
  58 #include "pkt.h"
  59 #include "daemon.h"
  60 #include "rio.h"
  61 #include "riospace.h"
  62 #include "top.h"
  63 #include "cmdpkt.h"
  64 #include "map.h"
  65 #include "riotypes.h"
  66 #include "rup.h"
  67 #include "port.h"
  68 #include "riodrvr.h"
  69 #include "rioinfo.h"
  70 #include "func.h"
  71 #include "errors.h"
  72 #include "pci.h"
  73
  74 #include "parmmap.h"
  75 #include "unixrup.h"
  76 #include "board.h"
  77 #include "host.h"
  78 #include "error.h"
  79 #include "phb.h"
  80 #include "link.h"
  81 #include "cmdblk.h"
  82 #include "route.h"
  83 #include "control.h"
  84 #include "cirrus.h"
  85 #include "rioioctl.h"
  86
  87
  88 static void RIOReceive(struct rio_info *, struct Port *);
  89
  90
  91 static char *firstchars(char *p, int nch)
  92 {
  93         static char buf[2][128];
  94         static int t = 0;
  95         t = !t;
  96         memcpy(buf[t], p, nch);
  97         buf[t][nch] = 0;
  98         return buf[t];
  99 }
 100
 101
 102 #define INCR( P, I )    ((P) = (((P)+(I)) & p->RIOBufferMask))
 103 /* Enable and start the transmission of packets */
 104 void RIOTxEnable(en)
 105 char *en;
 106 {
 107         struct Port *PortP;
 108         struct rio_info *p;
 109         struct tty_struct *tty;
 110         int c;
 111         struct PKT *PacketP;
 112         unsigned long flags;
 113
 114         PortP = (struct Port *) en;
 115         p = (struct rio_info *) PortP->p;
 116         tty = PortP->gs.tty;
 117
 118
 119         rio_dprintk(RIO_DEBUG_INTR, "tx port %d: %d chars queued.\n", PortP->PortNum, PortP->gs.xmit_cnt);
 120
 121         if (!PortP->gs.xmit_cnt)
 122                 return;
 123
 124
 125         /* This routine is an order of magnitude simpler than the specialix
 126            version. One of the disadvantages is that this version will send
 127            an incomplete packet (usually 64 bytes instead of 72) once for
 128            every 4k worth of data. Let's just say that this won't influence
 129            performance significantly..... */
 130
 131         rio_spin_lock_irqsave(&PortP->portSem, flags);
 132
 133         while (can_add_transmit(&PacketP, PortP)) {
 134                 c = PortP->gs.xmit_cnt;
 135                 if (c > PKT_MAX_DATA_LEN)
 136                         c = PKT_MAX_DATA_LEN;
 137
 138                 /* Don't copy past the end of the source buffer */
 139                 if (c > SERIAL_XMIT_SIZE - PortP->gs.xmit_tail)
 140                         c = SERIAL_XMIT_SIZE - PortP->gs.xmit_tail;
 141
 142                 {
 143                         int t;
 144                         t = (c > 10) ? 10 : c;
 145
 146                         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));
 147                 }
 148                 /* If for one reason or another, we can't copy more data,
 149                    we're done! */
 150                 if (c == 0)
 151                         break;
 152
 153                 rio_memcpy_toio(PortP->HostP->Caddr, (caddr_t) PacketP->data, PortP->gs.xmit_buf + PortP->gs.xmit_tail, c);
 154                 /*    udelay (1); */
 155
 156                 writeb(c, &(PacketP->len));
 157                 if (!(PortP->State & RIO_DELETED)) {
 158                         add_transmit(PortP);
 159                         /*
 160                          ** Count chars tx'd for port statistics reporting
 161                          */
 162                         if (PortP->statsGather)
 163                                 PortP->txchars += c;
 164                 }
 165                 PortP->gs.xmit_tail = (PortP->gs.xmit_tail + c) & (SERIAL_XMIT_SIZE - 1);
 166                 PortP->gs.xmit_cnt -= c;
 167         }
 168
 169         rio_spin_unlock_irqrestore(&PortP->portSem, flags);
 170
 171         if (PortP->gs.xmit_cnt <= (PortP->gs.wakeup_chars + 2 * PKT_MAX_DATA_LEN)) {
 172                 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);
 173                 if ((PortP->gs.tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && PortP->gs.tty->ldisc.write_wakeup)
 174                         (PortP->gs.tty->ldisc.write_wakeup) (PortP->gs.tty);
 175                 rio_dprintk(RIO_DEBUG_INTR, "(%d/%d)\n", PortP->gs.wakeup_chars, PortP->gs.xmit_cnt);
 176                 wake_up_interruptible(&PortP->gs.tty->write_wait);
 177         }
 178
 179 }
 180
 181
 182 /*
 183 ** RIO Host Service routine. Does all the work traditionally associated with an
 184 ** interrupt.
 185 */
 186 static int RupIntr;
 187 static int RxIntr;
 188 static int TxIntr;
 189 void RIOServiceHost(p, HostP, From)
 190 struct rio_info *p;
 191 struct Host *HostP;
 192 int From;
 193 {
 194         rio_spin_lock(&HostP->HostLock);
 195         if ((HostP->Flags & RUN_STATE) != RC_RUNNING) {
 196                 static int t = 0;
 197                 rio_spin_unlock(&HostP->HostLock);
 198                 if ((t++ % 200) == 0)
 199                         rio_dprintk(RIO_DEBUG_INTR, "Interrupt but host not running. flags=%x.\n", (int) HostP->Flags);
 200                 return;
 201         }
 202         rio_spin_unlock(&HostP->HostLock);
 203
 204         if (RWORD(HostP->ParmMapP->rup_intr)) {
 205                 WWORD(HostP->ParmMapP->rup_intr, 0);
 206                 p->RIORupCount++;
 207                 RupIntr++;
 208                 rio_dprintk(RIO_DEBUG_INTR, "rio: RUP interrupt on host %d\n", HostP - p->RIOHosts);
 209                 RIOPollHostCommands(p, HostP);
 210         }
 211
 212         if (RWORD(HostP->ParmMapP->rx_intr)) {
 213                 int port;
 214
 215                 WWORD(HostP->ParmMapP->rx_intr, 0);
 216                 p->RIORxCount++;
 217                 RxIntr++;
 218
 219                 rio_dprintk(RIO_DEBUG_INTR, "rio: RX interrupt on host %d\n", HostP - p->RIOHosts);
 220                 /*
 221                  ** Loop through every port. If the port is mapped into
 222                  ** the system ( i.e. has /dev/ttyXXXX associated ) then it is
 223                  ** worth checking. If the port isn't open, grab any packets
 224                  ** hanging on its receive queue and stuff them on the free
 225                  ** list; check for commands on the way.
 226                  */
 227                 for (port = p->RIOFirstPortsBooted; port < p->RIOLastPortsBooted + PORTS_PER_RTA; port++) {
 228                         struct Port *PortP = p->RIOPortp[port];
 229                         struct tty_struct *ttyP;
 230                         struct PKT *PacketP;
 231
 232                         /*
 233                          ** not mapped in - most of the RIOPortp[] information
 234                          ** has not been set up!
 235                          ** Optimise: ports come in bundles of eight.
 236                          */
 237                         if (!PortP->Mapped) {
 238                                 port += 7;
 239                                 continue;       /* with the next port */
 240                         }
 241
 242                         /*
 243                          ** If the host board isn't THIS host board, check the next one.
 244                          ** optimise: ports come in bundles of eight.
 245                          */
 246                         if (PortP->HostP != HostP) {
 247                                 port += 7;
 248                                 continue;
 249                         }
 250
 251                         /*
 252                          ** Let us see - is the port open? If not, then don't service it.
 253                          */
 254                         if (!(PortP->PortState & PORT_ISOPEN)) {
 255                                 continue;
 256                         }
 257
 258                         /*
 259                          ** find corresponding tty structure. The process of mapping
 260                          ** the ports puts these here.
 261                          */
 262                         ttyP = PortP->gs.tty;
 263
 264                         /*
 265                          ** Lock the port before we begin working on it.
 266                          */
 267                         rio_spin_lock(&PortP->portSem);
 268
 269                         /*
 270                          ** Process received data if there is any.
 271                          */
 272                         if (can_remove_receive(&PacketP, PortP))
 273                                 RIOReceive(p, PortP);
 274
 275                         /*
 276                          ** If there is no data left to be read from the port, and
 277                          ** it's handshake bit is set, then we must clear the handshake,
 278                          ** so that that downstream RTA is re-enabled.
 279                          */
 280                         if (!can_remove_receive(&PacketP, PortP) && (RWORD(PortP->PhbP->handshake) == PHB_HANDSHAKE_SET)) {
 281                                 /*
 282                                  ** MAGIC! ( Basically, handshake the RX buffer, so that
 283                                  ** the RTAs upstream can be re-enabled. )
 284                                  */
 285                                 rio_dprintk(RIO_DEBUG_INTR, "Set RX handshake bit\n");
 286                                 WWORD(PortP->PhbP->handshake, PHB_HANDSHAKE_SET | PHB_HANDSHAKE_RESET);
 287                         }
 288                         rio_spin_unlock(&PortP->portSem);
 289                 }
 290         }
 291
 292         if (RWORD(HostP->ParmMapP->tx_intr)) {
 293                 int port;
 294
 295                 WWORD(HostP->ParmMapP->tx_intr, 0);
 296
 297                 p->RIOTxCount++;
 298                 TxIntr++;
 299                 rio_dprintk(RIO_DEBUG_INTR, "rio: TX interrupt on host %d\n", HostP - p->RIOHosts);
 300
 301                 /*
 302                  ** Loop through every port.
 303                  ** If the port is mapped into the system ( i.e. has /dev/ttyXXXX
 304                  ** associated ) then it is worth checking.
 305                  */
 306                 for (port = p->RIOFirstPortsBooted; port < p->RIOLastPortsBooted + PORTS_PER_RTA; port++) {
 307                         struct Port *PortP = p->RIOPortp[port];
 308                         struct tty_struct *ttyP;
 309                         struct PKT *PacketP;
 310
 311                         /*
 312                          ** not mapped in - most of the RIOPortp[] information
 313                          ** has not been set up!
 314                          */
 315                         if (!PortP->Mapped) {
 316                                 port += 7;
 317                                 continue;       /* with the next port */
 318                         }
 319
 320                         /*
 321                          ** If the host board isn't running, then its data structures
 322                          ** are no use to us - continue quietly.
 323                          */
 324                         if (PortP->HostP != HostP) {
 325                                 port += 7;
 326                                 continue;       /* with the next port */
 327                         }
 328
 329                         /*
 330                          ** Let us see - is the port open? If not, then don't service it.
 331                          */
 332                         if (!(PortP->PortState & PORT_ISOPEN)) {
 333                                 continue;
 334                         }
 335
 336                         rio_dprintk(RIO_DEBUG_INTR, "rio: Looking into port %d.\n", port);
 337                         /*
 338                          ** Lock the port before we begin working on it.
 339                          */
 340                         rio_spin_lock(&PortP->portSem);
 341
 342                         /*
 343                          ** If we can't add anything to the transmit queue, then
 344                          ** we need do none of this processing.
 345                          */
 346                         if (!can_add_transmit(&PacketP, PortP)) {
 347                                 rio_dprintk(RIO_DEBUG_INTR, "Can't add to port, so skipping.\n");
 348                                 rio_spin_unlock(&PortP->portSem);
 349                                 continue;
 350                         }
 351
 352                         /*
 353                          ** find corresponding tty structure. The process of mapping
 354                          ** the ports puts these here.
 355                          */
 356                         ttyP = PortP->gs.tty;
 357                         /* If ttyP is NULL, the port is getting closed. Forget about it. */
 358                         if (!ttyP) {
 359                                 rio_dprintk(RIO_DEBUG_INTR, "no tty, so skipping.\n");
 360                                 rio_spin_unlock(&PortP->portSem);
 361                                 continue;
 362                         }
 363                         /*
 364                          ** If there is more room available we start up the transmit
 365                          ** data process again. This can be direct I/O, if the cookmode
 366                          ** is set to COOK_RAW or COOK_MEDIUM, or will be a call to the
 367                          ** riotproc( T_OUTPUT ) if we are in COOK_WELL mode, to fetch
 368                          ** characters via the line discipline. We must always call
 369                          ** the line discipline,
 370                          ** so that user input characters can be echoed correctly.
 371                          **
 372                          ** ++++ Update +++++
 373                          ** With the advent of double buffering, we now see if
 374                          ** TxBufferOut-In is non-zero. If so, then we copy a packet
 375                          ** to the output place, and set it going. If this empties
 376                          ** the buffer, then we must issue a wakeup( ) on OUT.
 377                          ** If it frees space in the buffer then we must issue
 378                          ** a wakeup( ) on IN.
 379                          **
 380                          ** ++++ Extra! Extra! If PortP->WflushFlag is set, then we
 381                          ** have to send a WFLUSH command down the PHB, to mark the
 382                          ** end point of a WFLUSH. We also need to clear out any
 383                          ** data from the double buffer! ( note that WflushFlag is a
 384                          ** *count* of the number of WFLUSH commands outstanding! )
 385                          **
 386                          ** ++++ And there's more!
 387                          ** If an RTA is powered off, then on again, and rebooted,
 388                          ** whilst it has ports open, then we need to re-open the ports.
 389                          ** ( reasonable enough ). We can't do this when we spot the
 390                          ** re-boot, in interrupt time, because the queue is probably
 391                          ** full. So, when we come in here, we need to test if any
 392                          ** ports are in this condition, and re-open the port before
 393                          ** we try to send any more data to it. Now, the re-booted
 394                          ** RTA will be discarding packets from the PHB until it
 395                          ** receives this open packet, but don't worry tooo much
 396                          ** about that. The one thing that is interesting is the
 397                          ** combination of this effect and the WFLUSH effect!
 398                          */
 399                         /* For now don't handle RTA reboots. -- REW.
 400                            Reenabled. Otherwise RTA reboots didn't work. Duh. -- REW */
 401                         if (PortP->MagicFlags) {
 402 #if 1
 403                                 if (PortP->MagicFlags & MAGIC_REBOOT) {
 404                                         /*
 405                                          ** well, the RTA has been rebooted, and there is room
 406                                          ** on its queue to add the open packet that is required.
 407                                          **
 408                                          ** The messy part of this line is trying to decide if
 409                                          ** we need to call the Param function as a tty or as
 410                                          ** a modem.
 411                                          ** DONT USE CLOCAL AS A TEST FOR THIS!
 412                                          **
 413                                          ** If we can't param the port, then move on to the
 414                                          ** next port.
 415                                          */
 416                                         PortP->InUse = NOT_INUSE;
 417
 418                                         rio_spin_unlock(&PortP->portSem);
 419                                         if (RIOParam(PortP, OPEN, ((PortP->Cor2Copy & (COR2_RTSFLOW | COR2_CTSFLOW)) == (COR2_RTSFLOW | COR2_CTSFLOW)) ? TRUE : FALSE, DONT_SLEEP) == RIO_FAIL) {
 420                                                 continue;       /* with next port */
 421                                         }
 422                                         rio_spin_lock(&PortP->portSem);
 423                                         PortP->MagicFlags &= ~MAGIC_REBOOT;
 424                                 }
 425 #endif
 426
 427                                 /*
 428                                  ** As mentioned above, this is a tacky hack to cope
 429                                  ** with WFLUSH
 430                                  */
 431                                 if (PortP->WflushFlag) {
 432                                         rio_dprintk(RIO_DEBUG_INTR, "Want to WFLUSH mark this port\n");
 433
 434                                         if (PortP->InUse)
 435                                                 rio_dprintk(RIO_DEBUG_INTR, "FAILS - PORT IS IN USE\n");
 436                                 }
 437
 438                                 while (PortP->WflushFlag && can_add_transmit(&PacketP, PortP) && (PortP->InUse == NOT_INUSE)) {
 439                                         int p;
 440                                         struct PktCmd *PktCmdP;
 441
 442                                         rio_dprintk(RIO_DEBUG_INTR, "Add WFLUSH marker to data queue\n");
 443                                         /*
 444                                          ** make it look just like a WFLUSH command
 445                                          */
 446                                         PktCmdP = (struct PktCmd *) &PacketP->data[0];
 447
 448                                         WBYTE(PktCmdP->Command, WFLUSH);
 449
 450                                         p = PortP->HostPort % (ushort) PORTS_PER_RTA;
 451
 452                                         /*
 453                                          ** If second block of ports for 16 port RTA, add 8
 454                                          ** to index 8-15.
 455                                          */
 456                                         if (PortP->SecondBlock)
 457                                                 p += PORTS_PER_RTA;
 458
 459                                         WBYTE(PktCmdP->PhbNum, p);
 460
 461                                         /*
 462                                          ** to make debuggery easier
 463                                          */
 464                                         WBYTE(PacketP->data[2], 'W');
 465                                         WBYTE(PacketP->data[3], 'F');
 466                                         WBYTE(PacketP->data[4], 'L');
 467                                         WBYTE(PacketP->data[5], 'U');
 468                                         WBYTE(PacketP->data[6], 'S');
 469                                         WBYTE(PacketP->data[7], 'H');
 470                                         WBYTE(PacketP->data[8], ' ');
 471                                         WBYTE(PacketP->data[9], '0' + PortP->WflushFlag);
 472                                         WBYTE(PacketP->data[10], ' ');
 473                                         WBYTE(PacketP->data[11], ' ');
 474                                         WBYTE(PacketP->data[12], '\0');
 475
 476                                         /*
 477                                          ** its two bytes long!
 478                                          */
 479                                         WBYTE(PacketP->len, PKT_CMD_BIT | 2);
 480
 481                                         /*
 482                                          ** queue it!
 483                                          */
 484                                         if (!(PortP->State & RIO_DELETED)) {
 485                                                 add_transmit(PortP);
 486                                                 /*
 487                                                  ** Count chars tx'd for port statistics reporting
 488                                                  */
 489                                                 if (PortP->statsGather)
 490                                                         PortP->txchars += 2;
 491                                         }
 492
 493                                         if (--(PortP->WflushFlag) == 0) {
 494                                                 PortP->MagicFlags &= ~MAGIC_FLUSH;
 495                                         }
 496
 497                                         rio_dprintk(RIO_DEBUG_INTR, "Wflush count now stands at %d\n", PortP->WflushFlag);
 498                                 }
 499                                 if (PortP->MagicFlags & MORE_OUTPUT_EYGOR) {
 500                                         if (PortP->MagicFlags & MAGIC_FLUSH) {
 501                                                 PortP->MagicFlags |= MORE_OUTPUT_EYGOR;
 502                                         } else {
 503                                                 if (!can_add_transmit(&PacketP, PortP)) {
 504                                                         rio_spin_unlock(&PortP->portSem);
 505                                                         continue;
 506                                                 }
 507                                                 rio_spin_unlock(&PortP->portSem);
 508                                                 RIOTxEnable((char *) PortP);
 509                                                 rio_spin_lock(&PortP->portSem);
 510                                                 PortP->MagicFlags &= ~MORE_OUTPUT_EYGOR;
 511                                         }
 512                                 }
 513                         }
 514
 515
 516                         /*
 517                          ** If we can't add anything to the transmit queue, then
 518                          ** we need do none of the remaining processing.
 519                          */
 520                         if (!can_add_transmit(&PacketP, PortP)) {
 521                                 rio_spin_unlock(&PortP->portSem);
 522                                 continue;
 523                         }
 524
 525                         rio_spin_unlock(&PortP->portSem);
 526                         RIOTxEnable((char *) PortP);
 527                 }
 528         }
 529 }
 530
 531 /*
 532 ** Routine for handling received data for clist drivers.
 533 ** NB: Called with the tty locked. The spl from the lockb( ) is passed.
 534 ** we return the ttySpl level that we re-locked at.
 535 */
 536 static void RIOReceive(p, PortP)
 537 struct rio_info *p;
 538 struct Port *PortP;
 539 {
 540         struct tty_struct *TtyP;
 541         register ushort transCount;
 542         struct PKT *PacketP;
 543         register uint DataCnt;
 544         uchar *ptr;
 545         unsigned char *buf;
 546         int copied = 0;
 547
 548         static int intCount, RxIntCnt;
 549
 550         /*
 551          ** The receive data process is to remove packets from the
 552          ** PHB until there aren't any more or the current cblock
 553          ** is full. When this occurs, there will be some left over
 554          ** data in the packet, that we must do something with.
 555          ** As we haven't unhooked the packet from the read list
 556          ** yet, we can just leave the packet there, having first
 557          ** made a note of how far we got. This means that we need
 558          ** a pointer per port saying where we start taking the
 559          ** data from - this will normally be zero, but when we
 560          ** run out of space it will be set to the offset of the
 561          ** next byte to copy from the packet data area. The packet
 562          ** length field is decremented by the number of bytes that
 563          ** we succesfully removed from the packet. When this reaches
 564          ** zero, we reset the offset pointer to be zero, and free
 565          ** the packet from the front of the queue.
 566          */
 567
 568         intCount++;
 569
 570         TtyP = PortP->gs.tty;
 571         if (!TtyP) {
 572                 rio_dprintk(RIO_DEBUG_INTR, "RIOReceive: tty is null. \n");
 573                 return;
 574         }
 575
 576         if (PortP->State & RIO_THROTTLE_RX) {
 577                 rio_dprintk(RIO_DEBUG_INTR, "RIOReceive: Throttled. Can't handle more input.\n");
 578                 return;
 579         }
 580
 581         if (PortP->State & RIO_DELETED) {
 582                 while (can_remove_receive(&PacketP, PortP)) {
 583                         remove_receive(PortP);
 584                         put_free_end(PortP->HostP, PacketP);
 585                 }
 586         } else {
 587                 /*
 588                  ** loop, just so long as:
 589                  **   i ) there's some data ( i.e. can_remove_receive )
 590                  **  ii ) we haven't been blocked
 591                  ** iii ) there's somewhere to put the data
 592                  **  iv ) we haven't outstayed our welcome
 593                  */
 594                 transCount = 1;
 595                 while (can_remove_receive(&PacketP, PortP)
 596                        && transCount) {
 597 #ifdef STATS
 598                         PortP->Stat.RxIntCnt++;
 599 #endif                          /* STATS */
 600                         RxIntCnt++;
 601
 602                         /*
 603                          ** check that it is not a command!
 604                          */
 605                         if (PacketP->len & PKT_CMD_BIT) {
 606                                 rio_dprintk(RIO_DEBUG_INTR, "RIO: unexpected command packet received on PHB\n");
 607                                 /*      rio_dprint(RIO_DEBUG_INTR, (" sysport   = %d\n", p->RIOPortp->PortNum)); */
 608                                 rio_dprintk(RIO_DEBUG_INTR, " dest_unit = %d\n", PacketP->dest_unit);
 609                                 rio_dprintk(RIO_DEBUG_INTR, " dest_port = %d\n", PacketP->dest_port);
 610                                 rio_dprintk(RIO_DEBUG_INTR, " src_unit  = %d\n", PacketP->src_unit);
 611                                 rio_dprintk(RIO_DEBUG_INTR, " src_port  = %d\n", PacketP->src_port);
 612                                 rio_dprintk(RIO_DEBUG_INTR, " len          = %d\n", PacketP->len);
 613                                 rio_dprintk(RIO_DEBUG_INTR, " control   = %d\n", PacketP->control);
 614                                 rio_dprintk(RIO_DEBUG_INTR, " csum         = %d\n", PacketP->csum);
 615                                 rio_dprintk(RIO_DEBUG_INTR, "    data bytes: ");
 616                                 for (DataCnt = 0; DataCnt < PKT_MAX_DATA_LEN; DataCnt++)
 617                                         rio_dprintk(RIO_DEBUG_INTR, "%d\n", PacketP->data[DataCnt]);
 618                                 remove_receive(PortP);
 619                                 put_free_end(PortP->HostP, PacketP);
 620                                 continue;       /* with next packet */
 621                         }
 622
 623                         /*
 624                          ** How many characters can we move 'upstream' ?
 625                          **
 626                          ** Determine the minimum of the amount of data
 627                          ** available and the amount of space in which to
 628                          ** put it.
 629                          **
 630                          ** 1.        Get the packet length by masking 'len'
 631                          **   for only the length bits.
 632                          ** 2.        Available space is [buffer size] - [space used]
 633                          **
 634                          ** Transfer count is the minimum of packet length
 635                          ** and available space.
 636                          */
 637
 638                         transCount = tty_buffer_request_room(TtyP, PacketP->len & PKT_LEN_MASK);
 639                         rio_dprintk(RIO_DEBUG_REC, "port %d: Copy %d bytes\n", PortP->PortNum, transCount);
 640                         /*
 641                          ** To use the following 'kkprintfs' for debugging - change the '#undef'
 642                          ** to '#define', (this is the only place ___DEBUG_IT___ occurs in the
 643                          ** driver).
 644                          */
 645 #undef ___DEBUG_IT___
 646 #ifdef ___DEBUG_IT___
 647                         kkprintf("I:%d R:%d P:%d Q:%d C:%d F:%x ", intCount, RxIntCnt, PortP->PortNum, TtyP->rxqueue.count, transCount, TtyP->flags);
 648 #endif
 649                         ptr = (uchar *) PacketP->data + PortP->RxDataStart;
 650
 651                         tty_prepare_flip_string(TtyP, &buf, transCount);
 652                         rio_memcpy_fromio(buf, ptr, transCount);
 653 #ifdef STATS
 654                         /*
 655                          ** keep a count for statistical purposes
 656                          */
 657                         PortP->Stat.RxCharCnt += transCount;
 658 #endif
 659                         PortP->RxDataStart += transCount;
 660                         PacketP->len -= transCount;
 661                         copied += transCount;
 662
 663
 664 #ifdef ___DEBUG_IT___
 665                         kkprintf("T:%d L:%d\n", DataCnt, PacketP->len);
 666 #endif
 667
 668                         if (PacketP->len == 0) {
 669                                 /*
 670                                  ** If we have emptied the packet, then we can
 671                                  ** free it, and reset the start pointer for
 672                                  ** the next packet.
 673                                  */
 674                                 remove_receive(PortP);
 675                                 put_free_end(PortP->HostP, PacketP);
 676                                 PortP->RxDataStart = 0;
 677 #ifdef STATS
 678                                 /*
 679                                  ** more lies ( oops, I mean statistics )
 680                                  */
 681                                 PortP->Stat.RxPktCnt++;
 682 #endif                          /* STATS */
 683                         }
 684                 }
 685         }
 686         if (copied) {
 687                 rio_dprintk(RIO_DEBUG_REC, "port %d: pushing tty flip buffer: %d total bytes copied.\n", PortP->PortNum, copied);
 688                 tty_flip_buffer_push(TtyP);
 689         }
 690
 691         return;
 692 }
 693
 694 #ifdef FUTURE_RELEASE
 695 /*
 696 ** The proc routine called by the line discipline to do the work for it.
 697 ** The proc routine works hand in hand with the interrupt routine.
 698 */
 699 int riotproc(p, tp, cmd, port)
 700 struct rio_info *p;
 701 register struct ttystatics *tp;
 702 int cmd;
 703 int port;
 704 {
 705         register struct Port *PortP;
 706         int SysPort;
 707         struct PKT *PacketP;
 708
 709         SysPort = port;         /* Believe me, it works. */
 710
 711         if (SysPort < 0 || SysPort >= RIO_PORTS) {
 712                 rio_dprintk(RIO_DEBUG_INTR, "Illegal port %d derived from TTY in riotproc()\n", SysPort);
 713                 return 0;
 714         }
 715         PortP = p->RIOPortp[SysPort];
 716
 717         if ((uint) PortP->PhbP < (uint) PortP->Caddr || (uint) PortP->PhbP >= (uint) PortP->Caddr + SIXTY_FOUR_K) {
 718                 rio_dprintk(RIO_DEBUG_INTR, "RIO: NULL or BAD PhbP on sys port %d in proc routine\n", SysPort);
 719                 rio_dprintk(RIO_DEBUG_INTR, "    PortP = 0x%x\n", PortP);
 720                 rio_dprintk(RIO_DEBUG_INTR, "    PortP->PhbP = 0x%x\n", PortP->PhbP);
 721                 rio_dprintk(RIO_DEBUG_INTR, "    PortP->Caddr = 0x%x\n", PortP->PhbP);
 722                 rio_dprintk(RIO_DEBUG_INTR, "    PortP->HostPort = 0x%x\n", PortP->HostPort);
 723                 return 0;
 724         }
 725
 726         switch (cmd) {
 727         case T_WFLUSH:
 728                 rio_dprintk(RIO_DEBUG_INTR, "T_WFLUSH\n");
 729                 /*
 730                  ** Because of the spooky way the RIO works, we don't need
 731                  ** to issue a flush command on any of the SET*F commands,
 732                  ** as that causes trouble with getty and login, which issue
 733                  ** these commands to incur a READ flush, and rely on the fact
 734                  ** that the line discipline does a wait for drain for them.
 735                  ** As the rio doesn't wait for drain, the write flush would
 736                  ** destroy the Password: prompt. This isn't very friendly, so
 737                  ** here we only issue a WFLUSH command if we are in the interrupt
 738                  ** routine, or we aren't executing a SET*F command.
 739                  */
 740                 if (PortP->HostP->InIntr || !PortP->FlushCmdBodge) {
 741                         /*
 742                          ** form a wflush packet - 1 byte long, no data
 743                          */
 744                         if (PortP->State & RIO_DELETED) {
 745                                 rio_dprintk(RIO_DEBUG_INTR, "WFLUSH on deleted RTA\n");
 746                         } else {
 747                                 if (RIOPreemptiveCmd(p, PortP, WFLUSH) == RIO_FAIL) {
 748                                         rio_dprintk(RIO_DEBUG_INTR, "T_WFLUSH Command failed\n");
 749                                 } else
 750                                         rio_dprintk(RIO_DEBUG_INTR, "T_WFLUSH Command\n");
 751                         }
 752                         /*
 753                          ** WFLUSH operation - flush the data!
 754                          */
 755                         PortP->TxBufferIn = PortP->TxBufferOut = 0;
 756                 } else {
 757                         rio_dprintk(RIO_DEBUG_INTR, "T_WFLUSH Command ignored\n");
 758                 }
 759                 /*
 760                  ** sort out the line discipline
 761                  */
 762                 if (PortP->CookMode == COOK_WELL)
 763                         goto start;
 764                 break;
 765
 766         case T_RESUME:
 767                 rio_dprintk(RIO_DEBUG_INTR, "T_RESUME\n");
 768                 /*
 769                  ** send pre-emptive resume packet
 770                  */
 771                 if (PortP->State & RIO_DELETED) {
 772                         rio_dprintk(RIO_DEBUG_INTR, "RESUME on deleted RTA\n");
 773                 } else {
 774                         if (RIOPreemptiveCmd(p, PortP, RESUME) == RIO_FAIL) {
 775                                 rio_dprintk(RIO_DEBUG_INTR, "T_RESUME Command failed\n");
 776                         }
 777                 }
 778                 /*
 779                  ** and re-start the sender software!
 780                  */
 781                 if (PortP->CookMode == COOK_WELL)
 782                         goto start;
 783                 break;
 784
 785         case T_TIME:
 786                 rio_dprintk(RIO_DEBUG_INTR, "T_TIME\n");
 787                 /*
 788                  ** T_TIME is called when xDLY is set in oflags and
 789                  ** the line discipline timeout has expired. It's
 790                  ** function in life is to clear the TIMEOUT flag
 791                  ** and to re-start output to the port.
 792                  */
 793                 /*
 794                  ** Fall through and re-start output
 795                  */
 796         case T_OUTPUT:
 797               start:
 798                 if (PortP->MagicFlags & MAGIC_FLUSH) {
 799                         PortP->MagicFlags |= MORE_OUTPUT_EYGOR;
 800                         return 0;
 801                 }
 802                 RIOTxEnable((char *) PortP);
 803                 PortP->MagicFlags &= ~MORE_OUTPUT_EYGOR;
 804                 /*rio_dprint(RIO_DEBUG_INTR, PortP,DBG_PROC,"T_OUTPUT finished\n"); */
 805                 break;
 806
 807         case T_SUSPEND:
 808                 rio_dprintk(RIO_DEBUG_INTR, "T_SUSPEND\n");
 809                 /*
 810                  ** send a suspend pre-emptive packet.
 811                  */
 812                 if (PortP->State & RIO_DELETED) {
 813                         rio_dprintk(RIO_DEBUG_INTR, "SUSPEND deleted RTA\n");
 814                 } else {
 815                         if (RIOPreemptiveCmd(p, PortP, SUSPEND) == RIO_FAIL) {
 816                                 rio_dprintk(RIO_DEBUG_INTR, "T_SUSPEND Command failed\n");
 817                         }
 818                 }
 819                 /*
 820                  ** done!
 821                  */
 822                 break;
 823
 824         case T_BLOCK:
 825                 rio_dprintk(RIO_DEBUG_INTR, "T_BLOCK\n");
 826                 break;
 827
 828         case T_RFLUSH:
 829                 rio_dprintk(RIO_DEBUG_INTR, "T_RFLUSH\n");
 830                 if (PortP->State & RIO_DELETED) {
 831                         rio_dprintk(RIO_DEBUG_INTR, "RFLUSH on deleted RTA\n");
 832                         PortP->RxDataStart = 0;
 833                 } else {
 834                         if (RIOPreemptiveCmd(p, PortP, RFLUSH) == RIO_FAIL) {
 835                                 rio_dprintk(RIO_DEBUG_INTR, "T_RFLUSH Command failed\n");
 836                                 return 0;
 837                         }
 838                         PortP->RxDataStart = 0;
 839                         while (can_remove_receive(&PacketP, PortP)) {
 840                                 remove_receive(PortP);
 841                                 ShowPacket(DBG_PROC, PacketP);
 842                                 put_free_end(PortP->HostP, PacketP);
 843                         }
 844                         if (PortP->PhbP->handshake == PHB_HANDSHAKE_SET) {
 845                                 /*
 846                                  ** MAGIC!
 847                                  */
 848                                 rio_dprintk(RIO_DEBUG_INTR, "Set receive handshake bit\n");
 849                                 PortP->PhbP->handshake |= PHB_HANDSHAKE_RESET;
 850                         }
 851                 }
 852                 break;
 853                 /* FALLTHROUGH */
 854         case T_UNBLOCK:
 855                 rio_dprintk(RIO_DEBUG_INTR, "T_UNBLOCK\n");
 856                 /*
 857                  ** If there is any data to receive set a timeout to service it.
 858                  */
 859                 RIOReceive(p, PortP);
 860                 break;
 861
 862         case T_BREAK:
 863                 rio_dprintk(RIO_DEBUG_INTR, "T_BREAK\n");
 864                 /*
 865                  ** Send a break command. For Sys V
 866                  ** this is a timed break, so we
 867                  ** send a SBREAK[time] packet
 868                  */
 869                 /*
 870                  ** Build a BREAK command
 871                  */
 872                 if (PortP->State & RIO_DELETED) {
 873                         rio_dprintk(RIO_DEBUG_INTR, "BREAK on deleted RTA\n");
 874                 } else {
 875                         if (RIOShortCommand(PortP, SBREAK, 2, p->RIOConf.BreakInterval) == RIO_FAIL) {
 876                                 rio_dprintk(RIO_DEBUG_INTR, "SBREAK RIOShortCommand failed\n");
 877                         }
 878                 }
 879
 880                 /*
 881                  ** done!
 882                  */
 883                 break;
 884
 885         case T_INPUT:
 886                 rio_dprintk(RIO_DEBUG_INTR, "Proc T_INPUT called - I don't know what to do!\n");
 887                 break;
 888         case T_PARM:
 889                 rio_dprintk(RIO_DEBUG_INTR, "Proc T_PARM called - I don't know what to do!\n");
 890                 break;
 891
 892         case T_SWTCH:
 893                 rio_dprintk(RIO_DEBUG_INTR, "Proc T_SWTCH called - I don't know what to do!\n");
 894                 break;
 895
 896         default:
 897                 rio_dprintk(RIO_DEBUG_INTR, "Proc UNKNOWN command %d\n", cmd);
 898         }
 899         /*
 900          ** T_OUTPUT returns without passing through this point!
 901          */
 902         /*rio_dprint(RIO_DEBUG_INTR, PortP,DBG_PROC,"riotproc done\n"); */
 903         return (0);
 904 }
 905 #endif