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 #include <linux/module.h>
  34 #include <linux/errno.h>
  35 #include <linux/tty.h>
  36 #include <asm/io.h>
  37 #include <asm/system.h>
  38 #include <asm/string.h>
  39 #include <asm/uaccess.h>
  40
  41 #include <linux/termios.h>
  42 #include <linux/serial.h>
  43
  44 #include <linux/generic_serial.h>
  45
  46
  47 #include "linux_compat.h"
  48 #include "rio_linux.h"
  49 #include "pkt.h"
  50 #include "daemon.h"
  51 #include "rio.h"
  52 #include "riospace.h"
  53 #include "cmdpkt.h"
  54 #include "map.h"
  55 #include "rup.h"
  56 #include "port.h"
  57 #include "riodrvr.h"
  58 #include "rioinfo.h"
  59 #include "func.h"
  60 #include "errors.h"
  61 #include "pci.h"
  62
  63 #include "parmmap.h"
  64 #include "unixrup.h"
  65 #include "board.h"
  66 #include "host.h"
  67 #include "phb.h"
  68 #include "link.h"
  69 #include "cmdblk.h"
  70 #include "route.h"
  71 #include "cirrus.h"
  72 #include "rioioctl.h"
  73 #include "param.h"
  74
  75
  76
  77 /*
  78 ** The Scam, based on email from jeremyr@bugs.specialix.co.uk....
  79 **
  80 ** To send a command on a particular port, you put a packet with the
  81 ** command bit set onto the port. The command bit is in the len field,
  82 ** and gets ORed in with the actual byte count.
  83 **
  84 ** When you send a packet with the command bit set the first
  85 ** data byte (data[0]) is interpreted as the command to execute.
  86 ** It also governs what data structure overlay should accompany the packet.
  87 ** Commands are defined in cirrus/cirrus.h
  88 **
  89 ** If you want the command to pre-emt data already on the queue for the
  90 ** port, set the pre-emptive bit in conjunction with the command bit.
  91 ** It is not defined what will happen if you set the preemptive bit
  92 ** on a packet that is NOT a command.
  93 **
  94 ** Pre-emptive commands should be queued at the head of the queue using
  95 ** add_start(), whereas normal commands and data are enqueued using
  96 ** add_end().
  97 **
  98 ** Most commands do not use the remaining bytes in the data array. The
  99 ** exceptions are OPEN MOPEN and CONFIG. (NB. As with the SI CONFIG and
 100 ** OPEN are currently analogous). With these three commands the following
 101 ** 11 data bytes are all used to pass config information such as baud rate etc.
 102 ** The fields are also defined in cirrus.h. Some contain straightforward
 103 ** information such as the transmit XON character. Two contain the transmit and
 104 ** receive baud rates respectively. For most baud rates there is a direct
 105 ** mapping between the rates defined in <sys/termio.h> and the byte in the
 106 ** packet. There are additional (non UNIX-standard) rates defined in
 107 ** /u/dos/rio/cirrus/h/brates.h.
 108 **
 109 ** The rest of the data fields contain approximations to the Cirrus registers
 110 ** that are used to program number of bits etc. Each registers bit fields is
 111 ** defined in cirrus.h.
 112 **
 113 ** NB. Only use those bits that are defined as being driver specific
 114 ** or common to the RTA and the driver.
 115 **
 116 ** All commands going from RTA->Host will be dealt with by the Host code - you
 117 ** will never see them. As with the SI there will be three fields to look out
 118 ** for in each phb (not yet defined - needs defining a.s.a.p).
 119 **
 120 ** modem_status - current state of handshake pins.
 121 **
 122 ** port_status   - current port status - equivalent to hi_stat for SI, indicates
 123 ** if port is IDLE_OPEN, IDLE_CLOSED etc.
 124 **
 125 ** break_status - bit X set if break has been received.
 126 **
 127 ** Happy hacking.
 128 **
 129 */
 130
 131 /*
 132 ** RIOParam is used to open or configure a port. You pass it a PortP,
 133 ** which will have a tty struct attached to it. You also pass a command,
 134 ** either OPEN or CONFIG. The port's setup is taken from the t_ fields
 135 ** of the tty struct inside the PortP, and the port is either opened
 136 ** or re-configured. You must also tell RIOParam if the device is a modem
 137 ** device or not (i.e. top bit of minor number set or clear - take special
 138 ** care when deciding on this!).
 139 ** RIOParam neither flushes nor waits for drain, and is NOT preemptive.
 140 **
 141 ** RIOParam assumes it will be called at splrio(), and also assumes
 142 ** that CookMode is set correctly in the port structure.
 143 **
 144 ** NB. for MPX
 145 **      tty lock must NOT have been previously acquired.
 146 */
 147 int RIOParam(struct Port *PortP, int cmd, int Modem, int SleepFlag)
 148 {
 149         struct tty_struct *TtyP;
 150         int retval;
 151         struct phb_param __iomem *phb_param_ptr;
 152         struct PKT __iomem *PacketP;
 153         int res;
 154         u8 Cor1 = 0, Cor2 = 0, Cor4 = 0, Cor5 = 0;
 155         u8 TxXon = 0, TxXoff = 0, RxXon = 0, RxXoff = 0;
 156         u8 LNext = 0, TxBaud = 0, RxBaud = 0;
 157         int retries = 0xff;
 158         unsigned long flags;
 159
 160         func_enter();
 161
 162         TtyP = PortP->gs.port.tty;
 163
 164         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);
 165
 166         if (!TtyP) {
 167                 rio_dprintk(RIO_DEBUG_PARAM, "Can't call rioparam with null tty.\n");
 168
 169                 func_exit();
 170
 171                 return RIO_FAIL;
 172         }
 173         rio_spin_lock_irqsave(&PortP->portSem, flags);
 174
 175         if (cmd == RIOC_OPEN) {
 176                 /*
 177                  ** If the port is set to store or lock the parameters, and it is
 178                  ** paramed with OPEN, we want to restore the saved port termio, but
 179                  ** only if StoredTermio has been saved, i.e. NOT 1st open after reboot.
 180                  */
 181         }
 182
 183         /*
 184          ** wait for space
 185          */
 186         while (!(res = can_add_transmit(&PacketP, PortP)) || (PortP->InUse != NOT_INUSE)) {
 187                 if (retries-- <= 0) {
 188                         break;
 189                 }
 190                 if (PortP->InUse != NOT_INUSE) {
 191                         rio_dprintk(RIO_DEBUG_PARAM, "Port IN_USE for pre-emptive command\n");
 192                 }
 193
 194                 if (!res) {
 195                         rio_dprintk(RIO_DEBUG_PARAM, "Port has no space on transmit queue\n");
 196                 }
 197
 198                 if (SleepFlag != OK_TO_SLEEP) {
 199                         rio_spin_unlock_irqrestore(&PortP->portSem, flags);
 200                         func_exit();
 201
 202                         return RIO_FAIL;
 203                 }
 204
 205                 rio_dprintk(RIO_DEBUG_PARAM, "wait for can_add_transmit\n");
 206                 rio_spin_unlock_irqrestore(&PortP->portSem, flags);
 207                 retval = RIODelay(PortP, HUNDRED_MS);
 208                 rio_spin_lock_irqsave(&PortP->portSem, flags);
 209                 if (retval == RIO_FAIL) {
 210                         rio_dprintk(RIO_DEBUG_PARAM, "wait for can_add_transmit broken by signal\n");
 211                         rio_spin_unlock_irqrestore(&PortP->portSem, flags);
 212                         func_exit();
 213                         return -EINTR;
 214                 }
 215                 if (PortP->State & RIO_DELETED) {
 216                         rio_spin_unlock_irqrestore(&PortP->portSem, flags);
 217                         func_exit();
 218                         return 0;
 219                 }
 220         }
 221
 222         if (!res) {
 223                 rio_spin_unlock_irqrestore(&PortP->portSem, flags);
 224                 func_exit();
 225
 226                 return RIO_FAIL;
 227         }
 228
 229         rio_dprintk(RIO_DEBUG_PARAM, "can_add_transmit() returns %x\n", res);
 230         rio_dprintk(RIO_DEBUG_PARAM, "Packet is %p\n", PacketP);
 231
 232         phb_param_ptr = (struct phb_param __iomem *) PacketP->data;
 233
 234
 235         switch (TtyP->termios->c_cflag & CSIZE) {
 236         case CS5:
 237                 {
 238                         rio_dprintk(RIO_DEBUG_PARAM, "5 bit data\n");
 239                         Cor1 |= RIOC_COR1_5BITS;
 240                         break;
 241                 }
 242         case CS6:
 243                 {
 244                         rio_dprintk(RIO_DEBUG_PARAM, "6 bit data\n");
 245                         Cor1 |= RIOC_COR1_6BITS;
 246                         break;
 247                 }
 248         case CS7:
 249                 {
 250                         rio_dprintk(RIO_DEBUG_PARAM, "7 bit data\n");
 251                         Cor1 |= RIOC_COR1_7BITS;
 252                         break;
 253                 }
 254         case CS8:
 255                 {
 256                         rio_dprintk(RIO_DEBUG_PARAM, "8 bit data\n");
 257                         Cor1 |= RIOC_COR1_8BITS;
 258                         break;
 259                 }
 260         }
 261
 262         if (TtyP->termios->c_cflag & CSTOPB) {
 263                 rio_dprintk(RIO_DEBUG_PARAM, "2 stop bits\n");
 264                 Cor1 |= RIOC_COR1_2STOP;
 265         } else {
 266                 rio_dprintk(RIO_DEBUG_PARAM, "1 stop bit\n");
 267                 Cor1 |= RIOC_COR1_1STOP;
 268         }
 269
 270         if (TtyP->termios->c_cflag & PARENB) {
 271                 rio_dprintk(RIO_DEBUG_PARAM, "Enable parity\n");
 272                 Cor1 |= RIOC_COR1_NORMAL;
 273         } else {
 274                 rio_dprintk(RIO_DEBUG_PARAM, "Disable parity\n");
 275                 Cor1 |= RIOC_COR1_NOP;
 276         }
 277         if (TtyP->termios->c_cflag & PARODD) {
 278                 rio_dprintk(RIO_DEBUG_PARAM, "Odd parity\n");
 279                 Cor1 |= RIOC_COR1_ODD;
 280         } else {
 281                 rio_dprintk(RIO_DEBUG_PARAM, "Even parity\n");
 282                 Cor1 |= RIOC_COR1_EVEN;
 283         }
 284
 285         /*
 286          ** COR 2
 287          */
 288         if (TtyP->termios->c_iflag & IXON) {
 289                 rio_dprintk(RIO_DEBUG_PARAM, "Enable start/stop output control\n");
 290                 Cor2 |= RIOC_COR2_IXON;
 291         } else {
 292                 if (PortP->Config & RIO_IXON) {
 293                         rio_dprintk(RIO_DEBUG_PARAM, "Force enable start/stop output control\n");
 294                         Cor2 |= RIOC_COR2_IXON;
 295                 } else
 296                         rio_dprintk(RIO_DEBUG_PARAM, "IXON has been disabled.\n");
 297         }
 298
 299         if (TtyP->termios->c_iflag & IXANY) {
 300                 if (PortP->Config & RIO_IXANY) {
 301                         rio_dprintk(RIO_DEBUG_PARAM, "Enable any key to restart output\n");
 302                         Cor2 |= RIOC_COR2_IXANY;
 303                 } else
 304                         rio_dprintk(RIO_DEBUG_PARAM, "IXANY has been disabled due to sanity reasons.\n");
 305         }
 306
 307         if (TtyP->termios->c_iflag & IXOFF) {
 308                 rio_dprintk(RIO_DEBUG_PARAM, "Enable start/stop input control 2\n");
 309                 Cor2 |= RIOC_COR2_IXOFF;
 310         }
 311
 312         if (TtyP->termios->c_cflag & HUPCL) {
 313                 rio_dprintk(RIO_DEBUG_PARAM, "Hangup on last close\n");
 314                 Cor2 |= RIOC_COR2_HUPCL;
 315         }
 316
 317         if (C_CRTSCTS(TtyP)) {
 318                 rio_dprintk(RIO_DEBUG_PARAM, "Rx hardware flow control enabled\n");
 319                 Cor2 |= RIOC_COR2_CTSFLOW;
 320                 Cor2 |= RIOC_COR2_RTSFLOW;
 321         } else {
 322                 rio_dprintk(RIO_DEBUG_PARAM, "Rx hardware flow control disabled\n");
 323                 Cor2 &= ~RIOC_COR2_CTSFLOW;
 324                 Cor2 &= ~RIOC_COR2_RTSFLOW;
 325         }
 326
 327
 328         if (TtyP->termios->c_cflag & CLOCAL) {
 329                 rio_dprintk(RIO_DEBUG_PARAM, "Local line\n");
 330         } else {
 331                 rio_dprintk(RIO_DEBUG_PARAM, "Possible Modem line\n");
 332         }
 333
 334         /*
 335          ** COR 4 (there is no COR 3)
 336          */
 337         if (TtyP->termios->c_iflag & IGNBRK) {
 338                 rio_dprintk(RIO_DEBUG_PARAM, "Ignore break condition\n");
 339                 Cor4 |= RIOC_COR4_IGNBRK;
 340         }
 341         if (!(TtyP->termios->c_iflag & BRKINT)) {
 342                 rio_dprintk(RIO_DEBUG_PARAM, "Break generates NULL condition\n");
 343                 Cor4 |= RIOC_COR4_NBRKINT;
 344         } else {
 345                 rio_dprintk(RIO_DEBUG_PARAM, "Interrupt on      break condition\n");
 346         }
 347
 348         if (TtyP->termios->c_iflag & INLCR) {
 349                 rio_dprintk(RIO_DEBUG_PARAM, "Map newline to carriage return on input\n");
 350                 Cor4 |= RIOC_COR4_INLCR;
 351         }
 352
 353         if (TtyP->termios->c_iflag & IGNCR) {
 354                 rio_dprintk(RIO_DEBUG_PARAM, "Ignore carriage return on input\n");
 355                 Cor4 |= RIOC_COR4_IGNCR;
 356         }
 357
 358         if (TtyP->termios->c_iflag & ICRNL) {
 359                 rio_dprintk(RIO_DEBUG_PARAM, "Map carriage return to newline on input\n");
 360                 Cor4 |= RIOC_COR4_ICRNL;
 361         }
 362         if (TtyP->termios->c_iflag & IGNPAR) {
 363                 rio_dprintk(RIO_DEBUG_PARAM, "Ignore characters with parity errors\n");
 364                 Cor4 |= RIOC_COR4_IGNPAR;
 365         }
 366         if (TtyP->termios->c_iflag & PARMRK) {
 367                 rio_dprintk(RIO_DEBUG_PARAM, "Mark parity errors\n");
 368                 Cor4 |= RIOC_COR4_PARMRK;
 369         }
 370
 371         /*
 372          ** Set the RAISEMOD flag to ensure that the modem lines are raised
 373          ** on reception of a config packet.
 374          ** The download code handles the zero baud condition.
 375          */
 376         Cor4 |= RIOC_COR4_RAISEMOD;
 377
 378         /*
 379          ** COR 5
 380          */
 381
 382         Cor5 = RIOC_COR5_CMOE;
 383
 384         /*
 385          ** Set to monitor tbusy/tstop (or not).
 386          */
 387
 388         if (PortP->MonitorTstate)
 389                 Cor5 |= RIOC_COR5_TSTATE_ON;
 390         else
 391                 Cor5 |= RIOC_COR5_TSTATE_OFF;
 392
 393         /*
 394          ** Could set LNE here if you wanted LNext processing. SVR4 will use it.
 395          */
 396         if (TtyP->termios->c_iflag & ISTRIP) {
 397                 rio_dprintk(RIO_DEBUG_PARAM, "Strip input characters\n");
 398                 if (!(PortP->State & RIO_TRIAD_MODE)) {
 399                         Cor5 |= RIOC_COR5_ISTRIP;
 400                 }
 401         }
 402
 403         if (TtyP->termios->c_oflag & ONLCR) {
 404                 rio_dprintk(RIO_DEBUG_PARAM, "Map newline to carriage-return, newline on output\n");
 405                 if (PortP->CookMode == COOK_MEDIUM)
 406                         Cor5 |= RIOC_COR5_ONLCR;
 407         }
 408         if (TtyP->termios->c_oflag & OCRNL) {
 409                 rio_dprintk(RIO_DEBUG_PARAM, "Map carriage return to newline on output\n");
 410                 if (PortP->CookMode == COOK_MEDIUM)
 411                         Cor5 |= RIOC_COR5_OCRNL;
 412         }
 413         if ((TtyP->termios->c_oflag & TABDLY) == TAB3) {
 414                 rio_dprintk(RIO_DEBUG_PARAM, "Tab delay 3 set\n");
 415                 if (PortP->CookMode == COOK_MEDIUM)
 416                         Cor5 |= RIOC_COR5_TAB3;
 417         }
 418
 419         /*
 420          ** Flow control bytes.
 421          */
 422         TxXon = TtyP->termios->c_cc[VSTART];
 423         TxXoff = TtyP->termios->c_cc[VSTOP];
 424         RxXon = TtyP->termios->c_cc[VSTART];
 425         RxXoff = TtyP->termios->c_cc[VSTOP];
 426         /*
 427          ** LNEXT byte
 428          */
 429         LNext = 0;
 430
 431         /*
 432          ** Baud rate bytes
 433          */
 434         rio_dprintk(RIO_DEBUG_PARAM, "Mapping of rx/tx baud %x (%x)\n", TtyP->termios->c_cflag, CBAUD);
 435
 436         switch (TtyP->termios->c_cflag & CBAUD) {
 437 #define e(b) case B ## b : RxBaud = TxBaud = RIO_B ## b ;break
 438                 e(50);
 439                 e(75);
 440                 e(110);
 441                 e(134);
 442                 e(150);
 443                 e(200);
 444                 e(300);
 445                 e(600);
 446                 e(1200);
 447                 e(1800);
 448                 e(2400);
 449                 e(4800);
 450                 e(9600);
 451                 e(19200);
 452                 e(38400);
 453                 e(57600);
 454                 e(115200);      /* e(230400);e(460800); e(921600);  */
 455         }
 456
 457         rio_dprintk(RIO_DEBUG_PARAM, "tx baud 0x%x, rx baud 0x%x\n", TxBaud, RxBaud);
 458
 459
 460         /*
 461          ** Leftovers
 462          */
 463         if (TtyP->termios->c_cflag & CREAD)
 464                 rio_dprintk(RIO_DEBUG_PARAM, "Enable receiver\n");
 465 #ifdef RCV1EN
 466         if (TtyP->termios->c_cflag & RCV1EN)
 467                 rio_dprintk(RIO_DEBUG_PARAM, "RCV1EN (?)\n");
 468 #endif
 469 #ifdef XMT1EN
 470         if (TtyP->termios->c_cflag & XMT1EN)
 471                 rio_dprintk(RIO_DEBUG_PARAM, "XMT1EN (?)\n");
 472 #endif
 473         if (TtyP->termios->c_lflag & ISIG)
 474                 rio_dprintk(RIO_DEBUG_PARAM, "Input character signal generating enabled\n");
 475         if (TtyP->termios->c_lflag & ICANON)
 476                 rio_dprintk(RIO_DEBUG_PARAM, "Canonical input: erase and kill enabled\n");
 477         if (TtyP->termios->c_lflag & XCASE)
 478                 rio_dprintk(RIO_DEBUG_PARAM, "Canonical upper/lower presentation\n");
 479         if (TtyP->termios->c_lflag & ECHO)
 480                 rio_dprintk(RIO_DEBUG_PARAM, "Enable input echo\n");
 481         if (TtyP->termios->c_lflag & ECHOE)
 482                 rio_dprintk(RIO_DEBUG_PARAM, "Enable echo erase\n");
 483         if (TtyP->termios->c_lflag & ECHOK)
 484                 rio_dprintk(RIO_DEBUG_PARAM, "Enable echo kill\n");
 485         if (TtyP->termios->c_lflag & ECHONL)
 486                 rio_dprintk(RIO_DEBUG_PARAM, "Enable echo newline\n");
 487         if (TtyP->termios->c_lflag & NOFLSH)
 488                 rio_dprintk(RIO_DEBUG_PARAM, "Disable flush after interrupt or quit\n");
 489 #ifdef TOSTOP
 490         if (TtyP->termios->c_lflag & TOSTOP)
 491                 rio_dprintk(RIO_DEBUG_PARAM, "Send SIGTTOU for background output\n");
 492 #endif
 493 #ifdef XCLUDE
 494         if (TtyP->termios->c_lflag & XCLUDE)
 495                 rio_dprintk(RIO_DEBUG_PARAM, "Exclusive use of this line\n");
 496 #endif
 497         if (TtyP->termios->c_iflag & IUCLC)
 498                 rio_dprintk(RIO_DEBUG_PARAM, "Map uppercase to lowercase on input\n");
 499         if (TtyP->termios->c_oflag & OPOST)
 500                 rio_dprintk(RIO_DEBUG_PARAM, "Enable output post-processing\n");
 501         if (TtyP->termios->c_oflag & OLCUC)
 502                 rio_dprintk(RIO_DEBUG_PARAM, "Map lowercase to uppercase on output\n");
 503         if (TtyP->termios->c_oflag & ONOCR)
 504                 rio_dprintk(RIO_DEBUG_PARAM, "No carriage return output at column 0\n");
 505         if (TtyP->termios->c_oflag & ONLRET)
 506                 rio_dprintk(RIO_DEBUG_PARAM, "Newline performs carriage return function\n");
 507         if (TtyP->termios->c_oflag & OFILL)
 508                 rio_dprintk(RIO_DEBUG_PARAM, "Use fill characters for delay\n");
 509         if (TtyP->termios->c_oflag & OFDEL)
 510                 rio_dprintk(RIO_DEBUG_PARAM, "Fill character is DEL\n");
 511         if (TtyP->termios->c_oflag & NLDLY)
 512                 rio_dprintk(RIO_DEBUG_PARAM, "Newline delay set\n");
 513         if (TtyP->termios->c_oflag & CRDLY)
 514                 rio_dprintk(RIO_DEBUG_PARAM, "Carriage return delay set\n");
 515         if (TtyP->termios->c_oflag & TABDLY)
 516                 rio_dprintk(RIO_DEBUG_PARAM, "Tab delay set\n");
 517         /*
 518          ** These things are kind of useful in a later life!
 519          */
 520         PortP->Cor2Copy = Cor2;
 521
 522         if (PortP->State & RIO_DELETED) {
 523                 rio_spin_unlock_irqrestore(&PortP->portSem, flags);
 524                 func_exit();
 525
 526                 return RIO_FAIL;
 527         }
 528
 529         /*
 530          ** Actually write the info into the packet to be sent
 531          */
 532         writeb(cmd, &phb_param_ptr->Cmd);
 533         writeb(Cor1, &phb_param_ptr->Cor1);
 534         writeb(Cor2, &phb_param_ptr->Cor2);
 535         writeb(Cor4, &phb_param_ptr->Cor4);
 536         writeb(Cor5, &phb_param_ptr->Cor5);
 537         writeb(TxXon, &phb_param_ptr->TxXon);
 538         writeb(RxXon, &phb_param_ptr->RxXon);
 539         writeb(TxXoff, &phb_param_ptr->TxXoff);
 540         writeb(RxXoff, &phb_param_ptr->RxXoff);
 541         writeb(LNext, &phb_param_ptr->LNext);
 542         writeb(TxBaud, &phb_param_ptr->TxBaud);
 543         writeb(RxBaud, &phb_param_ptr->RxBaud);
 544
 545         /*
 546          ** Set the length/command field
 547          */
 548         writeb(12 | PKT_CMD_BIT, &PacketP->len);
 549
 550         /*
 551          ** The packet is formed - now, whack it off
 552          ** to its final destination:
 553          */
 554         add_transmit(PortP);
 555         /*
 556          ** Count characters transmitted for port statistics reporting
 557          */
 558         if (PortP->statsGather)
 559                 PortP->txchars += 12;
 560
 561         rio_spin_unlock_irqrestore(&PortP->portSem, flags);
 562
 563         rio_dprintk(RIO_DEBUG_PARAM, "add_transmit returned.\n");
 564         /*
 565          ** job done.
 566          */
 567         func_exit();
 568
 569         return 0;
 570 }
 571
 572
 573 /*
 574 ** We can add another packet to a transmit queue if the packet pointer pointed
 575 ** to by the TxAdd pointer has PKT_IN_USE clear in its address.
 576 */
 577 int can_add_transmit(struct PKT __iomem **PktP, struct Port *PortP)
 578 {
 579         struct PKT __iomem *tp;
 580
 581         *PktP = tp = (struct PKT __iomem *) RIO_PTR(PortP->Caddr, readw(PortP->TxAdd));
 582
 583         return !((unsigned long) tp & PKT_IN_USE);
 584 }
 585
 586 /*
 587 ** To add a packet to the queue, you set the PKT_IN_USE bit in the address,
 588 ** and then move the TxAdd pointer along one position to point to the next
 589 ** packet pointer. You must wrap the pointer from the end back to the start.
 590 */
 591 void add_transmit(struct Port *PortP)
 592 {
 593         if (readw(PortP->TxAdd) & PKT_IN_USE) {
 594                 rio_dprintk(RIO_DEBUG_PARAM, "add_transmit: Packet has been stolen!");
 595         }
 596         writew(readw(PortP->TxAdd) | PKT_IN_USE, PortP->TxAdd);
 597         PortP->TxAdd = (PortP->TxAdd == PortP->TxEnd) ? PortP->TxStart : PortP->TxAdd + 1;
 598         writew(RIO_OFF(PortP->Caddr, PortP->TxAdd), &PortP->PhbP->tx_add);
 599 }
 600
 601 /****************************************
 602  * Put a packet onto the end of the
 603  * free list
 604  ****************************************/
 605 void put_free_end(struct Host *HostP, struct PKT __iomem *PktP)
 606 {
 607         struct rio_free_list __iomem *tmp_pointer;
 608         unsigned short old_end, new_end;
 609         unsigned long flags;
 610
 611         rio_spin_lock_irqsave(&HostP->HostLock, flags);
 612
 613          /*************************************************
 614         * Put a packet back onto the back of the free list
 615         *
 616         ************************************************/
 617
 618         rio_dprintk(RIO_DEBUG_PFE, "put_free_end(PktP=%p)\n", PktP);
 619
 620         if ((old_end = readw(&HostP->ParmMapP->free_list_end)) != TPNULL) {
 621                 new_end = RIO_OFF(HostP->Caddr, PktP);
 622                 tmp_pointer = (struct rio_free_list __iomem *) RIO_PTR(HostP->Caddr, old_end);
 623                 writew(new_end, &tmp_pointer->next);
 624                 writew(old_end, &((struct rio_free_list __iomem *) PktP)->prev);
 625                 writew(TPNULL, &((struct rio_free_list __iomem *) PktP)->next);
 626                 writew(new_end, &HostP->ParmMapP->free_list_end);
 627         } else {                /* First packet on the free list this should never happen! */
 628                 rio_dprintk(RIO_DEBUG_PFE, "put_free_end(): This should never happen\n");
 629                 writew(RIO_OFF(HostP->Caddr, PktP), &HostP->ParmMapP->free_list_end);
 630                 tmp_pointer = (struct rio_free_list __iomem *) PktP;
 631                 writew(TPNULL, &tmp_pointer->prev);
 632                 writew(TPNULL, &tmp_pointer->next);
 633         }
 634         rio_dprintk(RIO_DEBUG_CMD, "Before unlock: %p\n", &HostP->HostLock);
 635         rio_spin_unlock_irqrestore(&HostP->HostLock, flags);
 636 }
 637
 638 /*
 639 ** can_remove_receive(PktP,P) returns non-zero if PKT_IN_USE is set
 640 ** for the next packet on the queue. It will also set PktP to point to the
 641 ** relevant packet, [having cleared the PKT_IN_USE bit]. If PKT_IN_USE is clear,
 642 ** then can_remove_receive() returns 0.
 643 */
 644 int can_remove_receive(struct PKT __iomem **PktP, struct Port *PortP)
 645 {
 646         if (readw(PortP->RxRemove) & PKT_IN_USE) {
 647                 *PktP = (struct PKT __iomem *) RIO_PTR(PortP->Caddr, readw(PortP->RxRemove) & ~PKT_IN_USE);
 648                 return 1;
 649         }
 650         return 0;
 651 }
 652
 653 /*
 654 ** To remove a packet from the receive queue you clear its PKT_IN_USE bit,
 655 ** and then bump the pointers. Once the pointers get to the end, they must
 656 ** be wrapped back to the start.
 657 */
 658 void remove_receive(struct Port *PortP)
 659 {
 660         writew(readw(PortP->RxRemove) & ~PKT_IN_USE, PortP->RxRemove);
 661         PortP->RxRemove = (PortP->RxRemove == PortP->RxEnd) ? PortP->RxStart : PortP->RxRemove + 1;
 662         writew(RIO_OFF(PortP->Caddr, PortP->RxRemove), &PortP->PhbP->rx_remove);
 663 }