drivers/char/rio/rioparam.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          : rioparam.c
  24 **      SID             : 1.3
  25 **      Last Modified   : 11/6/98 10:33:45
  26 **      Retrieved       : 11/6/98 10:33:50
  27 **
  28 **  ident @(#)rioparam.c        1.3
  29 **
  30 ** -----------------------------------------------------------------------------
  31 */
  32
  33 #ifdef SCCS_LABELS
  34 static char *_rioparam_c_sccs_ = "@(#)rioparam.c        1.3";
  35 #endif
  36
  37 #include <linux/module.h>
  38 #include <linux/slab.h>
  39 #include <linux/errno.h>
  40 #include <linux/tty.h>
  41 #include <asm/io.h>
  42 #include <asm/system.h>
  43 #include <asm/string.h>
  44 #include <asm/uaccess.h>
  45
  46 #include <linux/termios.h>
  47 #include <linux/serial.h>
  48
  49 #include <linux/generic_serial.h>
  50
  51
  52 #include "linux_compat.h"
  53 #include "rio_linux.h"
  54 #include "pkt.h"
  55 #include "daemon.h"
  56 #include "rio.h"
  57 #include "riospace.h"
  58 #include "cmdpkt.h"
  59 #include "map.h"
  60 #include "rup.h"
  61 #include "port.h"
  62 #include "riodrvr.h"
  63 #include "rioinfo.h"
  64 #include "func.h"
  65 #include "errors.h"
  66 #include "pci.h"
  67
  68 #include "parmmap.h"
  69 #include "unixrup.h"
  70 #include "board.h"
  71 #include "host.h"
  72 #include "phb.h"
  73 #include "link.h"
  74 #include "cmdblk.h"
  75 #include "route.h"
  76 #include "cirrus.h"
  77 #include "rioioctl.h"
  78 #include "param.h"
  79
  80
  81
  82 /*
  83 ** The Scam, based on email from jeremyr@bugs.specialix.co.uk....
  84 **
  85 ** To send a command on a particular port, you put a packet with the
  86 ** command bit set onto the port. The command bit is in the len field,
  87 ** and gets ORed in with the actual byte count.
  88 **
  89 ** When you send a packet with the command bit set the first
  90 ** data byte (data[0]) is interpreted as the command to execute.
  91 ** It also governs what data structure overlay should accompany the packet.
  92 ** Commands are defined in cirrus/cirrus.h
  93 **
  94 ** If you want the command to pre-emt data already on the queue for the
  95 ** port, set the pre-emptive bit in conjunction with the command bit.
  96 ** It is not defined what will happen if you set the preemptive bit
  97 ** on a packet that is NOT a command.
  98 **
  99 ** Pre-emptive commands should be queued at the head of the queue using
 100 ** add_start(), whereas normal commands and data are enqueued using
 101 ** add_end().
 102 **
 103 ** Most commands do not use the remaining bytes in the data array. The
 104 ** exceptions are OPEN MOPEN and CONFIG. (NB. As with the SI CONFIG and
 105 ** OPEN are currently analogous). With these three commands the following
 106 ** 11 data bytes are all used to pass config information such as baud rate etc.
 107 ** The fields are also defined in cirrus.h. Some contain straightforward
 108 ** information such as the transmit XON character. Two contain the transmit and
 109 ** receive baud rates respectively. For most baud rates there is a direct
 110 ** mapping between the rates defined in <sys/termio.h> and the byte in the
 111 ** packet. There are additional (non UNIX-standard) rates defined in
 112 ** /u/dos/rio/cirrus/h/brates.h.
 113 **
 114 ** The rest of the data fields contain approximations to the Cirrus registers
 115 ** that are used to program number of bits etc. Each registers bit fields is
 116 ** defined in cirrus.h.
 117 **
 118 ** NB. Only use those bits that are defined as being driver specific
 119 ** or common to the RTA and the driver.
 120 **
 121 ** All commands going from RTA->Host will be dealt with by the Host code - you
 122 ** will never see them. As with the SI there will be three fields to look out
 123 ** for in each phb (not yet defined - needs defining a.s.a.p).
 124 **
 125 ** modem_status - current state of handshake pins.
 126 **
 127 ** port_status   - current port status - equivalent to hi_stat for SI, indicates
 128 ** if port is IDLE_OPEN, IDLE_CLOSED etc.
 129 **
 130 ** break_status - bit X set if break has been received.
 131 **
 132 ** Happy hacking.
 133 **
 134 */
 135
 136 /*
 137 ** RIOParam is used to open or configure a port. You pass it a PortP,
 138 ** which will have a tty struct attached to it. You also pass a command,
 139 ** either OPEN or CONFIG. The port's setup is taken from the t_ fields
 140 ** of the tty struct inside the PortP, and the port is either opened
 141 ** or re-configured. You must also tell RIOParam if the device is a modem
 142 ** device or not (i.e. top bit of minor number set or clear - take special
 143 ** care when deciding on this!).
 144 ** RIOParam neither flushes nor waits for drain, and is NOT preemptive.
 145 **
 146 ** RIOParam assumes it will be called at splrio(), and also assumes
 147 ** that CookMode is set correctly in the port structure.
 148 **
 149 ** NB. for MPX
 150 **      tty lock must NOT have been previously acquired.
 151 */
 152 int RIOParam(struct Port *PortP, int cmd, int Modem, int SleepFlag)
 153 {
 154         struct tty_struct *TtyP;
 155         int retval;
 156         struct phb_param __iomem *phb_param_ptr;
 157         struct PKT __iomem *PacketP;
 158         int res;
 159         u8 Cor1 = 0, Cor2 = 0, Cor4 = 0, Cor5 = 0;
 160         u8 TxXon = 0, TxXoff = 0, RxXon = 0, RxXoff = 0;
 161         u8 LNext = 0, TxBaud = 0, RxBaud = 0;
 162         int retries = 0xff;
 163         unsigned long flags;
 164
 165         func_enter();
 166
 167         TtyP = PortP->gs.tty;
 168
 169         rio_dprintk(RIO_DEBUG_PARAM, "RIOParam: Port:%d cmd:%d Modem:%d SleepFlag:%d Mapped: %d, tty=%p\n", PortP->PortNum, cmd, Modem, SleepFlag, PortP->Mapped, TtyP);
 170
 171         if (!TtyP) {
 172                 rio_dprintk(RIO_DEBUG_PARAM, "Can't call rioparam with null tty.\n");
 173
 174                 func_exit();
 175
 176                 return RIO_FAIL;
 177         }
 178         rio_spin_lock_irqsave(&PortP->portSem, flags);
 179
 180         if (cmd == OPEN) {
 181                 /*
 182                  ** If the port is set to store or lock the parameters, and it is
 183                  ** paramed with OPEN, we want to restore the saved port termio, but
 184                  ** only if StoredTermio has been saved, i.e. NOT 1st open after reboot.
 185                  */
 186         }
 187
 188         /*
 189          ** wait for space
 190          */
 191         while (!(res = can_add_transmit(&PacketP, PortP)) || (PortP->InUse != NOT_INUSE)) {
 192                 if (retries-- <= 0) {
 193                         break;
 194                 }
 195                 if (PortP->InUse != NOT_INUSE) {
 196                         rio_dprintk(RIO_DEBUG_PARAM, "Port IN_USE for pre-emptive command\n");
 197                 }
 198
 199                 if (!res) {
 200                         rio_dprintk(RIO_DEBUG_PARAM, "Port has no space on transmit queue\n");
 201                 }
 202
 203                 if (SleepFlag != OK_TO_SLEEP) {
 204                         rio_spin_unlock_irqrestore(&PortP->portSem, flags);
 205                         func_exit();
 206
 207                         return RIO_FAIL;
 208                 }
 209
 210                 rio_dprintk(RIO_DEBUG_PARAM, "wait for can_add_transmit\n");
 211                 rio_spin_unlock_irqrestore(&PortP->portSem, flags);
 212                 retval = RIODelay(PortP, HUNDRED_MS);
 213                 rio_spin_lock_irqsave(&PortP->portSem, flags);
 214                 if (retval == RIO_FAIL) {
 215                         rio_dprintk(RIO_DEBUG_PARAM, "wait for can_add_transmit broken by signal\n");
 216                         rio_spin_unlock_irqrestore(&PortP->portSem, flags);
 217                         func_exit();
 218                         return -EINTR;
 219                 }
 220                 if (PortP->State & RIO_DELETED) {
 221                         rio_spin_unlock_irqrestore(&PortP->portSem, flags);
 222                         func_exit();
 223                         return 0;
 224                 }
 225         }
 226
 227         if (!res) {
 228                 rio_spin_unlock_irqrestore(&PortP->portSem, flags);
 229                 func_exit();
 230
 231                 return RIO_FAIL;
 232         }
 233
 234         rio_dprintk(RIO_DEBUG_PARAM, "can_add_transmit() returns %x\n", res);
 235         rio_dprintk(RIO_DEBUG_PARAM, "Packet is %p\n", PacketP);
 236
 237         phb_param_ptr = (struct phb_param __iomem *) PacketP->data;
 238
 239
 240         switch (TtyP->termios->c_cflag & CSIZE) {
 241         case CS5:
 242                 {
 243                         rio_dprintk(RIO_DEBUG_PARAM, "5 bit data\n");
 244                         Cor1 |= COR1_5BITS;
 245                         break;
 246                 }
 247         case CS6:
 248                 {
 249                         rio_dprintk(RIO_DEBUG_PARAM, "6 bit data\n");
 250                         Cor1 |= COR1_6BITS;
 251                         break;
 252                 }
 253         case CS7:
 254                 {
 255                         rio_dprintk(RIO_DEBUG_PARAM, "7 bit data\n");
 256                         Cor1 |= COR1_7BITS;
 257                         break;
 258                 }
 259         case CS8:
 260                 {
 261                         rio_dprintk(RIO_DEBUG_PARAM, "8 bit data\n");
 262                         Cor1 |= COR1_8BITS;
 263                         break;
 264                 }
 265         }
 266
 267         if (TtyP->termios->c_cflag & CSTOPB) {
 268                 rio_dprintk(RIO_DEBUG_PARAM, "2 stop bits\n");
 269                 Cor1 |= COR1_2STOP;
 270         } else {
 271                 rio_dprintk(RIO_DEBUG_PARAM, "1 stop bit\n");
 272                 Cor1 |= COR1_1STOP;
 273         }
 274
 275         if (TtyP->termios->c_cflag & PARENB) {
 276                 rio_dprintk(RIO_DEBUG_PARAM, "Enable parity\n");
 277                 Cor1 |= COR1_NORMAL;
 278         } else {
 279                 rio_dprintk(RIO_DEBUG_PARAM, "Disable parity\n");
 280                 Cor1 |= COR1_NOP;
 281         }
 282         if (TtyP->termios->c_cflag & PARODD) {
 283                 rio_dprintk(RIO_DEBUG_PARAM, "Odd parity\n");
 284                 Cor1 |= COR1_ODD;
 285         } else {
 286                 rio_dprintk(RIO_DEBUG_PARAM, "Even parity\n");
 287                 Cor1 |= COR1_EVEN;
 288         }
 289
 290         /*
 291          ** COR 2
 292          */
 293         if (TtyP->termios->c_iflag & IXON) {
 294                 rio_dprintk(RIO_DEBUG_PARAM, "Enable start/stop output control\n");
 295                 Cor2 |= COR2_IXON;
 296         } else {
 297                 if (PortP->Config & RIO_IXON) {
 298                         rio_dprintk(RIO_DEBUG_PARAM, "Force enable start/stop output control\n");
 299                         Cor2 |= COR2_IXON;
 300                 } else
 301                         rio_dprintk(RIO_DEBUG_PARAM, "IXON has been disabled.\n");
 302         }
 303
 304         if (TtyP->termios->c_iflag & IXANY) {
 305                 if (PortP->Config & RIO_IXANY) {
 306                         rio_dprintk(RIO_DEBUG_PARAM, "Enable any key to restart output\n");
 307                         Cor2 |= COR2_IXANY;
 308                 } else
 309                         rio_dprintk(RIO_DEBUG_PARAM, "IXANY has been disabled due to sanity reasons.\n");
 310         }
 311
 312         if (TtyP->termios->c_iflag & IXOFF) {
 313                 rio_dprintk(RIO_DEBUG_PARAM, "Enable start/stop input control 2\n");
 314                 Cor2 |= COR2_IXOFF;
 315         }
 316
 317         if (TtyP->termios->c_cflag & HUPCL) {
 318                 rio_dprintk(RIO_DEBUG_PARAM, "Hangup on last close\n");
 319                 Cor2 |= COR2_HUPCL;
 320         }
 321
 322         if (C_CRTSCTS(TtyP)) {
 323                 rio_dprintk(RIO_DEBUG_PARAM, "Rx hardware flow control enabled\n");
 324                 Cor2 |= COR2_CTSFLOW;
 325                 Cor2 |= COR2_RTSFLOW;
 326         } else {
 327                 rio_dprintk(RIO_DEBUG_PARAM, "Rx hardware flow control disabled\n");
 328                 Cor2 &= ~COR2_CTSFLOW;
 329                 Cor2 &= ~COR2_RTSFLOW;
 330         }
 331
 332
 333         if (TtyP->termios->c_cflag & CLOCAL) {
 334                 rio_dprintk(RIO_DEBUG_PARAM, "Local line\n");
 335         } else {
 336                 rio_dprintk(RIO_DEBUG_PARAM, "Possible Modem line\n");
 337         }
 338
 339         /*
 340          ** COR 4 (there is no COR 3)
 341          */
 342         if (TtyP->termios->c_iflag & IGNBRK) {
 343                 rio_dprintk(RIO_DEBUG_PARAM, "Ignore break condition\n");
 344                 Cor4 |= COR4_IGNBRK;
 345         }
 346         if (!(TtyP->termios->c_iflag & BRKINT)) {
 347                 rio_dprintk(RIO_DEBUG_PARAM, "Break generates NULL condition\n");
 348                 Cor4 |= COR4_NBRKINT;
 349         } else {
 350                 rio_dprintk(RIO_DEBUG_PARAM, "Interrupt on      break condition\n");
 351         }
 352
 353         if (TtyP->termios->c_iflag & INLCR) {
 354                 rio_dprintk(RIO_DEBUG_PARAM, "Map newline to carriage return on input\n");
 355                 Cor4 |= COR4_INLCR;
 356         }
 357
 358         if (TtyP->termios->c_iflag & IGNCR) {
 359                 rio_dprintk(RIO_DEBUG_PARAM, "Ignore carriage return on input\n");
 360                 Cor4 |= COR4_IGNCR;
 361         }
 362
 363         if (TtyP->termios->c_iflag & ICRNL) {
 364                 rio_dprintk(RIO_DEBUG_PARAM, "Map carriage return to newline on input\n");
 365                 Cor4 |= COR4_ICRNL;
 366         }
 367         if (TtyP->termios->c_iflag & IGNPAR) {
 368                 rio_dprintk(RIO_DEBUG_PARAM, "Ignore characters with parity errors\n");
 369                 Cor4 |= COR4_IGNPAR;
 370         }
 371         if (TtyP->termios->c_iflag & PARMRK) {
 372                 rio_dprintk(RIO_DEBUG_PARAM, "Mark parity errors\n");
 373                 Cor4 |= COR4_PARMRK;
 374         }
 375
 376         /*
 377          ** Set the RAISEMOD flag to ensure that the modem lines are raised
 378          ** on reception of a config packet.
 379          ** The download code handles the zero baud condition.
 380          */
 381         Cor4 |= COR4_RAISEMOD;
 382
 383         /*
 384          ** COR 5
 385          */
 386
 387         Cor5 = COR5_CMOE;
 388
 389         /*
 390          ** Set to monitor tbusy/tstop (or not).
 391          */
 392
 393         if (PortP->MonitorTstate)
 394                 Cor5 |= COR5_TSTATE_ON;
 395         else
 396                 Cor5 |= COR5_TSTATE_OFF;
 397
 398         /*
 399          ** Could set LNE here if you wanted LNext processing. SVR4 will use it.
 400          */
 401         if (TtyP->termios->c_iflag & ISTRIP) {
 402                 rio_dprintk(RIO_DEBUG_PARAM, "Strip input characters\n");
 403                 if (!(PortP->State & RIO_TRIAD_MODE)) {
 404                         Cor5 |= COR5_ISTRIP;
 405                 }
 406         }
 407
 408         if (TtyP->termios->c_oflag & ONLCR) {
 409                 rio_dprintk(RIO_DEBUG_PARAM, "Map newline to carriage-return, newline on output\n");
 410                 if (PortP->CookMode == COOK_MEDIUM)
 411                         Cor5 |= COR5_ONLCR;
 412         }
 413         if (TtyP->termios->c_oflag & OCRNL) {
 414                 rio_dprintk(RIO_DEBUG_PARAM, "Map carriage return to newline on output\n");
 415                 if (PortP->CookMode == COOK_MEDIUM)
 416                         Cor5 |= COR5_OCRNL;
 417         }
 418         if ((TtyP->termios->c_oflag & TABDLY) == TAB3) {
 419                 rio_dprintk(RIO_DEBUG_PARAM, "Tab delay 3 set\n");
 420                 if (PortP->CookMode == COOK_MEDIUM)
 421                         Cor5 |= COR5_TAB3;
 422         }
 423
 424         /*
 425          ** Flow control bytes.
 426          */
 427         TxXon = TtyP->termios->c_cc[VSTART];
 428         TxXoff = TtyP->termios->c_cc[VSTOP];
 429         RxXon = TtyP->termios->c_cc[VSTART];
 430         RxXoff = TtyP->termios->c_cc[VSTOP];
 431         /*
 432          ** LNEXT byte
 433          */
 434         LNext = 0;
 435
 436         /*
 437          ** Baud rate bytes
 438          */
 439         rio_dprintk(RIO_DEBUG_PARAM, "Mapping of rx/tx baud %x (%x)\n", TtyP->termios->c_cflag, CBAUD);
 440
 441         switch (TtyP->termios->c_cflag & CBAUD) {
 442 #define e(b) case B ## b : RxBaud = TxBaud = RIO_B ## b ;break
 443                 e(50);
 444                 e(75);
 445                 e(110);
 446                 e(134);
 447                 e(150);
 448                 e(200);
 449                 e(300);
 450                 e(600);
 451                 e(1200);
 452                 e(1800);
 453                 e(2400);
 454                 e(4800);
 455                 e(9600);
 456                 e(19200);
 457                 e(38400);
 458                 e(57600);
 459                 e(115200);      /* e(230400);e(460800); e(921600);  */
 460         }
 461
 462         rio_dprintk(RIO_DEBUG_PARAM, "tx baud 0x%x, rx baud 0x%x\n", TxBaud, RxBaud);
 463
 464
 465         /*
 466          ** Leftovers
 467          */
 468         if (TtyP->termios->c_cflag & CREAD)
 469                 rio_dprintk(RIO_DEBUG_PARAM, "Enable receiver\n");
 470 #ifdef RCV1EN
 471         if (TtyP->termios->c_cflag & RCV1EN)
 472                 rio_dprintk(RIO_DEBUG_PARAM, "RCV1EN (?)\n");
 473 #endif
 474 #ifdef XMT1EN
 475         if (TtyP->termios->c_cflag & XMT1EN)
 476                 rio_dprintk(RIO_DEBUG_PARAM, "XMT1EN (?)\n");
 477 #endif
 478         if (TtyP->termios->c_lflag & ISIG)
 479                 rio_dprintk(RIO_DEBUG_PARAM, "Input character signal generating enabled\n");
 480         if (TtyP->termios->c_lflag & ICANON)
 481                 rio_dprintk(RIO_DEBUG_PARAM, "Canonical input: erase and kill enabled\n");
 482         if (TtyP->termios->c_lflag & XCASE)
 483                 rio_dprintk(RIO_DEBUG_PARAM, "Canonical upper/lower presentation\n");
 484         if (TtyP->termios->c_lflag & ECHO)
 485                 rio_dprintk(RIO_DEBUG_PARAM, "Enable input echo\n");
 486         if (TtyP->termios->c_lflag & ECHOE)
 487                 rio_dprintk(RIO_DEBUG_PARAM, "Enable echo erase\n");
 488         if (TtyP->termios->c_lflag & ECHOK)
 489                 rio_dprintk(RIO_DEBUG_PARAM, "Enable echo kill\n");
 490         if (TtyP->termios->c_lflag & ECHONL)
 491                 rio_dprintk(RIO_DEBUG_PARAM, "Enable echo newline\n");
 492         if (TtyP->termios->c_lflag & NOFLSH)
 493                 rio_dprintk(RIO_DEBUG_PARAM, "Disable flush after interrupt or quit\n");
 494 #ifdef TOSTOP
 495         if (TtyP->termios->c_lflag & TOSTOP)
 496                 rio_dprintk(RIO_DEBUG_PARAM, "Send SIGTTOU for background output\n");
 497 #endif
 498 #ifdef XCLUDE
 499         if (TtyP->termios->c_lflag & XCLUDE)
 500                 rio_dprintk(RIO_DEBUG_PARAM, "Exclusive use of this line\n");
 501 #endif
 502         if (TtyP->termios->c_iflag & IUCLC)
 503                 rio_dprintk(RIO_DEBUG_PARAM, "Map uppercase to lowercase on input\n");
 504         if (TtyP->termios->c_oflag & OPOST)
 505                 rio_dprintk(RIO_DEBUG_PARAM, "Enable output post-processing\n");
 506         if (TtyP->termios->c_oflag & OLCUC)
 507                 rio_dprintk(RIO_DEBUG_PARAM, "Map lowercase to uppercase on output\n");
 508         if (TtyP->termios->c_oflag & ONOCR)
 509                 rio_dprintk(RIO_DEBUG_PARAM, "No carriage return output at column 0\n");
 510         if (TtyP->termios->c_oflag & ONLRET)
 511                 rio_dprintk(RIO_DEBUG_PARAM, "Newline performs carriage return function\n");
 512         if (TtyP->termios->c_oflag & OFILL)
 513                 rio_dprintk(RIO_DEBUG_PARAM, "Use fill characters for delay\n");
 514         if (TtyP->termios->c_oflag & OFDEL)
 515                 rio_dprintk(RIO_DEBUG_PARAM, "Fill character is DEL\n");
 516         if (TtyP->termios->c_oflag & NLDLY)
 517                 rio_dprintk(RIO_DEBUG_PARAM, "Newline delay set\n");
 518         if (TtyP->termios->c_oflag & CRDLY)
 519                 rio_dprintk(RIO_DEBUG_PARAM, "Carriage return delay set\n");
 520         if (TtyP->termios->c_oflag & TABDLY)
 521                 rio_dprintk(RIO_DEBUG_PARAM, "Tab delay set\n");
 522         /*
 523          ** These things are kind of useful in a later life!
 524          */
 525         PortP->Cor2Copy = Cor2;
 526
 527         if (PortP->State & RIO_DELETED) {
 528                 rio_spin_unlock_irqrestore(&PortP->portSem, flags);
 529                 func_exit();
 530
 531                 return RIO_FAIL;
 532         }
 533
 534         /*
 535          ** Actually write the info into the packet to be sent
 536          */
 537         writeb(cmd, &phb_param_ptr->Cmd);
 538         writeb(Cor1, &phb_param_ptr->Cor1);
 539         writeb(Cor2, &phb_param_ptr->Cor2);
 540         writeb(Cor4, &phb_param_ptr->Cor4);
 541         writeb(Cor5, &phb_param_ptr->Cor5);
 542         writeb(TxXon, &phb_param_ptr->TxXon);
 543         writeb(RxXon, &phb_param_ptr->RxXon);
 544         writeb(TxXoff, &phb_param_ptr->TxXoff);
 545         writeb(RxXoff, &phb_param_ptr->RxXoff);
 546         writeb(LNext, &phb_param_ptr->LNext);
 547         writeb(TxBaud, &phb_param_ptr->TxBaud);
 548         writeb(RxBaud, &phb_param_ptr->RxBaud);
 549
 550         /*
 551          ** Set the length/command field
 552          */
 553         writeb(12 | PKT_CMD_BIT, &PacketP->len);
 554
 555         /*
 556          ** The packet is formed - now, whack it off
 557          ** to its final destination:
 558          */
 559         add_transmit(PortP);
 560         /*
 561          ** Count characters transmitted for port statistics reporting
 562          */
 563         if (PortP->statsGather)
 564                 PortP->txchars += 12;
 565
 566         rio_spin_unlock_irqrestore(&PortP->portSem, flags);
 567
 568         rio_dprintk(RIO_DEBUG_PARAM, "add_transmit returned.\n");
 569         /*
 570          ** job done.
 571          */
 572         func_exit();
 573
 574         return 0;
 575 }
 576
 577
 578 /*
 579 ** We can add another packet to a transmit queue if the packet pointer pointed
 580 ** to by the TxAdd pointer has PKT_IN_USE clear in its address.
 581 */
 582 int can_add_transmit(struct PKT __iomem **PktP, struct Port *PortP)
 583 {
 584         struct PKT __iomem *tp;
 585
 586         *PktP = tp = (struct PKT __iomem *) RIO_PTR(PortP->Caddr, readw(PortP->TxAdd));
 587
 588         return !((unsigned long) tp & PKT_IN_USE);
 589 }
 590
 591 /*
 592 ** To add a packet to the queue, you set the PKT_IN_USE bit in the address,
 593 ** and then move the TxAdd pointer along one position to point to the next
 594 ** packet pointer. You must wrap the pointer from the end back to the start.
 595 */
 596 void add_transmit(struct Port *PortP)
 597 {
 598         if (readw(PortP->TxAdd) & PKT_IN_USE) {
 599                 rio_dprintk(RIO_DEBUG_PARAM, "add_transmit: Packet has been stolen!");
 600         }
 601         writew(readw(PortP->TxAdd) | PKT_IN_USE, PortP->TxAdd);
 602         PortP->TxAdd = (PortP->TxAdd == PortP->TxEnd) ? PortP->TxStart : PortP->TxAdd + 1;
 603         writew(RIO_OFF(PortP->Caddr, PortP->TxAdd), &PortP->PhbP->tx_add);
 604 }
 605
 606 /****************************************
 607  * Put a packet onto the end of the
 608  * free list
 609  ****************************************/
 610 void put_free_end(struct Host *HostP, struct PKT __iomem *PktP)
 611 {
 612         struct rio_free_list __iomem *tmp_pointer;
 613         unsigned short old_end, new_end;
 614         unsigned long flags;
 615
 616         rio_spin_lock_irqsave(&HostP->HostLock, flags);
 617
 618          /*************************************************
 619         * Put a packet back onto the back of the free list
 620         *
 621         ************************************************/
 622
 623         rio_dprintk(RIO_DEBUG_PFE, "put_free_end(PktP=%p)\n", PktP);
 624
 625         if ((old_end = readw(&HostP->ParmMapP->free_list_end)) != TPNULL) {
 626                 new_end = RIO_OFF(HostP->Caddr, PktP);
 627                 tmp_pointer = (struct rio_free_list __iomem *) RIO_PTR(HostP->Caddr, old_end);
 628                 writew(new_end, &tmp_pointer->next);
 629                 writew(old_end, &((struct rio_free_list __iomem *) PktP)->prev);
 630                 writew(TPNULL, &((struct rio_free_list __iomem *) PktP)->next);
 631                 writew(new_end, &HostP->ParmMapP->free_list_end);
 632         } else {                /* First packet on the free list this should never happen! */
 633                 rio_dprintk(RIO_DEBUG_PFE, "put_free_end(): This should never happen\n");
 634                 writew(RIO_OFF(HostP->Caddr, PktP), &HostP->ParmMapP->free_list_end);
 635                 tmp_pointer = (struct rio_free_list __iomem *) PktP;
 636                 writew(TPNULL, &tmp_pointer->prev);
 637                 writew(TPNULL, &tmp_pointer->next);
 638         }
 639         rio_dprintk(RIO_DEBUG_CMD, "Before unlock: %p\n", &HostP->HostLock);
 640         rio_spin_unlock_irqrestore(&HostP->HostLock, flags);
 641 }
 642
 643 /*
 644 ** can_remove_receive(PktP,P) returns non-zero if PKT_IN_USE is set
 645 ** for the next packet on the queue. It will also set PktP to point to the
 646 ** relevant packet, [having cleared the PKT_IN_USE bit]. If PKT_IN_USE is clear,
 647 ** then can_remove_receive() returns 0.
 648 */
 649 int can_remove_receive(struct PKT __iomem **PktP, struct Port *PortP)
 650 {
 651         if (readw(PortP->RxRemove) & PKT_IN_USE) {
 652                 *PktP = (struct PKT __iomem *) RIO_PTR(PortP->Caddr, readw(PortP->RxRemove) & ~PKT_IN_USE);
 653                 return 1;
 654         }
 655         return 0;
 656 }
 657
 658 /*
 659 ** To remove a packet from the receive queue you clear its PKT_IN_USE bit,
 660 ** and then bump the pointers. Once the pointers get to the end, they must
 661 ** be wrapped back to the start.
 662 */
 663 void remove_receive(struct Port *PortP)
 664 {
 665         writew(readw(PortP->RxRemove) & ~PKT_IN_USE, PortP->RxRemove);
 666         PortP->RxRemove = (PortP->RxRemove == PortP->RxEnd) ? PortP->RxStart : PortP->RxRemove + 1;
 667         writew(RIO_OFF(PortP->Caddr, PortP->RxRemove), &PortP->PhbP->rx_remove);
 668 }