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/slab.h>
  35 #include <linux/errno.h>
  36 #include <linux/tty.h>
  37 #include <asm/io.h>
  38 #include <asm/system.h>
  39 #include <asm/string.h>
  40 #include <asm/uaccess.h>
  41
  42 #include <linux/termios.h>
  43 #include <linux/serial.h>
  44
  45 #include <linux/generic_serial.h>
  46
  47
  48 #include "linux_compat.h"
  49 #include "rio_linux.h"
  50 #include "pkt.h"
  51 #include "daemon.h"
  52 #include "rio.h"
  53 #include "riospace.h"
  54 #include "cmdpkt.h"
  55 #include "map.h"
  56 #include "rup.h"
  57 #include "port.h"
  58 #include "riodrvr.h"
  59 #include "rioinfo.h"
  60 #include "func.h"
  61 #include "errors.h"
  62 #include "pci.h"
  63
  64 #include "parmmap.h"
  65 #include "unixrup.h"
  66 #include "board.h"
  67 #include "host.h"
  68 #include "phb.h"
  69 #include "link.h"
  70 #include "cmdblk.h"
  71 #include "route.h"
  72 #include "cirrus.h"
  73 #include "rioioctl.h"
  74 #include "param.h"
  75
  76
  77
  78 /*
  79 ** The Scam, based on email from jeremyr@bugs.specialix.co.uk....
  80 **
  81 ** To send a command on a particular port, you put a packet with the
  82 ** command bit set onto the port. The command bit is in the len field,
  83 ** and gets ORed in with the actual byte count.
  84 **
  85 ** When you send a packet with the command bit set the first
  86 ** data byte (data[0]) is interpreted as the command to execute.
  87 ** It also governs what data structure overlay should accompany the packet.
  88 ** Commands are defined in cirrus/cirrus.h
  89 **
  90 ** If you want the command to pre-emt data already on the queue for the
  91 ** port, set the pre-emptive bit in conjunction with the command bit.
  92 ** It is not defined what will happen if you set the preemptive bit
  93 ** on a packet that is NOT a command.
  94 **
  95 ** Pre-emptive commands should be queued at the head of the queue using
  96 ** add_start(), whereas normal commands and data are enqueued using
  97 ** add_end().
  98 **
  99 ** Most commands do not use the remaining bytes in the data array. The
 100 ** exceptions are OPEN MOPEN and CONFIG. (NB. As with the SI CONFIG and
 101 ** OPEN are currently analogous). With these three commands the following
 102 ** 11 data bytes are all used to pass config information such as baud rate etc.
 103 ** The fields are also defined in cirrus.h. Some contain straightforward
 104 ** information such as the transmit XON character. Two contain the transmit and
 105 ** receive baud rates respectively. For most baud rates there is a direct
 106 ** mapping between the rates defined in <sys/termio.h> and the byte in the
 107 ** packet. There are additional (non UNIX-standard) rates defined in
 108 ** /u/dos/rio/cirrus/h/brates.h.
 109 **
 110 ** The rest of the data fields contain approximations to the Cirrus registers
 111 ** that are used to program number of bits etc. Each registers bit fields is
 112 ** defined in cirrus.h.
 113 **
 114 ** NB. Only use those bits that are defined as being driver specific
 115 ** or common to the RTA and the driver.
 116 **
 117 ** All commands going from RTA->Host will be dealt with by the Host code - you
 118 ** will never see them. As with the SI there will be three fields to look out
 119 ** for in each phb (not yet defined - needs defining a.s.a.p).
 120 **
 121 ** modem_status - current state of handshake pins.
 122 **
 123 ** port_status   - current port status - equivalent to hi_stat for SI, indicates
 124 ** if port is IDLE_OPEN, IDLE_CLOSED etc.
 125 **
 126 ** break_status - bit X set if break has been received.
 127 **
 128 ** Happy hacking.
 129 **
 130 */
 131
 132 /*
 133 ** RIOParam is used to open or configure a port. You pass it a PortP,
 134 ** which will have a tty struct attached to it. You also pass a command,
 135 ** either OPEN or CONFIG. The port's setup is taken from the t_ fields
 136 ** of the tty struct inside the PortP, and the port is either opened
 137 ** or re-configured. You must also tell RIOParam if the device is a modem
 138 ** device or not (i.e. top bit of minor number set or clear - take special
 139 ** care when deciding on this!).
 140 ** RIOParam neither flushes nor waits for drain, and is NOT preemptive.
 141 **
 142 ** RIOParam assumes it will be called at splrio(), and also assumes
 143 ** that CookMode is set correctly in the port structure.
 144 **
 145 ** NB. for MPX
 146 **      tty lock must NOT have been previously acquired.
 147 */
 148 int RIOParam(struct Port *PortP, int cmd, int Modem, int SleepFlag)
 149 {
 150         struct tty_struct *TtyP;
 151         int retval;
 152         struct phb_param __iomem *phb_param_ptr;
 153         struct PKT __iomem *PacketP;
 154         int res;
 155         u8 Cor1 = 0, Cor2 = 0, Cor4 = 0, Cor5 = 0;
 156         u8 TxXon = 0, TxXoff = 0, RxXon = 0, RxXoff = 0;
 157         u8 LNext = 0, TxBaud = 0, RxBaud = 0;
 158         int retries = 0xff;
 159         unsigned long flags;
 160
 161         func_enter();
 162
 163         TtyP = PortP->gs.port.tty;
 164
 165         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);
 166
 167         if (!TtyP) {
 168                 rio_dprintk(RIO_DEBUG_PARAM, "Can't call rioparam with null tty.\n");
 169
 170                 func_exit();
 171
 172                 return RIO_FAIL;
 173         }
 174         rio_spin_lock_irqsave(&PortP->portSem, flags);
 175
 176         if (cmd == RIOC_OPEN) {
 177                 /*
 178                  ** If the port is set to store or lock the parameters, and it is
 179                  ** paramed with OPEN, we want to restore the saved port termio, but
 180                  ** only if StoredTermio has been saved, i.e. NOT 1st open after reboot.
 181                  */
 182         }
 183
 184         /*
 185          ** wait for space
 186          */
 187         while (!(res = can_add_transmit(&PacketP, PortP)) || (PortP->InUse != NOT_INUSE)) {
 188                 if (retries-- <= 0) {
 189                         break;
 190                 }
 191                 if (PortP->InUse != NOT_INUSE) {
 192                         rio_dprintk(RIO_DEBUG_PARAM, "Port IN_USE for pre-emptive command\n");
 193                 }
 194
 195                 if (!res) {
 196                         rio_dprintk(RIO_DEBUG_PARAM, "Port has no space on transmit queue\n");
 197                 }
 198
 199                 if (SleepFlag != OK_TO_SLEEP) {
 200                         rio_spin_unlock_irqrestore(&PortP->portSem, flags);
 201                         func_exit();
 202
 203                         return RIO_FAIL;
 204                 }
 205
 206                 rio_dprintk(RIO_DEBUG_PARAM, "wait for can_add_transmit\n");
 207                 rio_spin_unlock_irqrestore(&PortP->portSem, flags);
 208                 retval = RIODelay(PortP, HUNDRED_MS);
 209                 rio_spin_lock_irqsave(&PortP->portSem, flags);
 210                 if (retval == RIO_FAIL) {
 211                         rio_dprintk(RIO_DEBUG_PARAM, "wait for can_add_transmit broken by signal\n");
 212                         rio_spin_unlock_irqrestore(&PortP->portSem, flags);
 213                         func_exit();
 214                         return -EINTR;
 215                 }
 216                 if (PortP->State & RIO_DELETED) {
 217                         rio_spin_unlock_irqrestore(&PortP->portSem, flags);
 218                         func_exit();
 219                         return 0;
 220                 }
 221         }
 222
 223         if (!res) {
 224                 rio_spin_unlock_irqrestore(&PortP->portSem, flags);
 225                 func_exit();
 226
 227                 return RIO_FAIL;
 228         }
 229
 230         rio_dprintk(RIO_DEBUG_PARAM, "can_add_transmit() returns %x\n", res);
 231         rio_dprintk(RIO_DEBUG_PARAM, "Packet is %p\n", PacketP);
 232
 233         phb_param_ptr = (struct phb_param __iomem *) PacketP->data;
 234
 235
 236         switch (TtyP->termios->c_cflag & CSIZE) {
 237         case CS5:
 238                 {
 239                         rio_dprintk(RIO_DEBUG_PARAM, "5 bit data\n");
 240                         Cor1 |= RIOC_COR1_5BITS;
 241                         break;
 242                 }
 243         case CS6:
 244                 {
 245                         rio_dprintk(RIO_DEBUG_PARAM, "6 bit data\n");
 246                         Cor1 |= RIOC_COR1_6BITS;
 247                         break;
 248                 }
 249         case CS7:
 250                 {
 251                         rio_dprintk(RIO_DEBUG_PARAM, "7 bit data\n");
 252                         Cor1 |= RIOC_COR1_7BITS;
 253                         break;
 254                 }
 255         case CS8:
 256                 {
 257                         rio_dprintk(RIO_DEBUG_PARAM, "8 bit data\n");
 258                         Cor1 |= RIOC_COR1_8BITS;
 259                         break;
 260                 }
 261         }
 262
 263         if (TtyP->termios->c_cflag & CSTOPB) {
 264                 rio_dprintk(RIO_DEBUG_PARAM, "2 stop bits\n");
 265                 Cor1 |= RIOC_COR1_2STOP;
 266         } else {
 267                 rio_dprintk(RIO_DEBUG_PARAM, "1 stop bit\n");
 268                 Cor1 |= RIOC_COR1_1STOP;
 269         }
 270
 271         if (TtyP->termios->c_cflag & PARENB) {
 272                 rio_dprintk(RIO_DEBUG_PARAM, "Enable parity\n");
 273                 Cor1 |= RIOC_COR1_NORMAL;
 274         } else {
 275                 rio_dprintk(RIO_DEBUG_PARAM, "Disable parity\n");
 276                 Cor1 |= RIOC_COR1_NOP;
 277         }
 278         if (TtyP->termios->c_cflag & PARODD) {
 279                 rio_dprintk(RIO_DEBUG_PARAM, "Odd parity\n");
 280                 Cor1 |= RIOC_COR1_ODD;
 281         } else {
 282                 rio_dprintk(RIO_DEBUG_PARAM, "Even parity\n");
 283                 Cor1 |= RIOC_COR1_EVEN;
 284         }
 285
 286         /*
 287          ** COR 2
 288          */
 289         if (TtyP->termios->c_iflag & IXON) {
 290                 rio_dprintk(RIO_DEBUG_PARAM, "Enable start/stop output control\n");
 291                 Cor2 |= RIOC_COR2_IXON;
 292         } else {
 293                 if (PortP->Config & RIO_IXON) {
 294                         rio_dprintk(RIO_DEBUG_PARAM, "Force enable start/stop output control\n");
 295                         Cor2 |= RIOC_COR2_IXON;
 296                 } else
 297                         rio_dprintk(RIO_DEBUG_PARAM, "IXON has been disabled.\n");
 298         }
 299
 300         if (TtyP->termios->c_iflag & IXANY) {
 301                 if (PortP->Config & RIO_IXANY) {
 302                         rio_dprintk(RIO_DEBUG_PARAM, "Enable any key to restart output\n");
 303                         Cor2 |= RIOC_COR2_IXANY;
 304                 } else
 305                         rio_dprintk(RIO_DEBUG_PARAM, "IXANY has been disabled due to sanity reasons.\n");
 306         }
 307
 308         if (TtyP->termios->c_iflag & IXOFF) {
 309                 rio_dprintk(RIO_DEBUG_PARAM, "Enable start/stop input control 2\n");
 310                 Cor2 |= RIOC_COR2_IXOFF;
 311         }
 312
 313         if (TtyP->termios->c_cflag & HUPCL) {
 314                 rio_dprintk(RIO_DEBUG_PARAM, "Hangup on last close\n");
 315                 Cor2 |= RIOC_COR2_HUPCL;
 316         }
 317
 318         if (C_CRTSCTS(TtyP)) {
 319                 rio_dprintk(RIO_DEBUG_PARAM, "Rx hardware flow control enabled\n");
 320                 Cor2 |= RIOC_COR2_CTSFLOW;
 321                 Cor2 |= RIOC_COR2_RTSFLOW;
 322         } else {
 323                 rio_dprintk(RIO_DEBUG_PARAM, "Rx hardware flow control disabled\n");
 324                 Cor2 &= ~RIOC_COR2_CTSFLOW;
 325                 Cor2 &= ~RIOC_COR2_RTSFLOW;
 326         }
 327
 328
 329         if (TtyP->termios->c_cflag & CLOCAL) {
 330                 rio_dprintk(RIO_DEBUG_PARAM, "Local line\n");
 331         } else {
 332                 rio_dprintk(RIO_DEBUG_PARAM, "Possible Modem line\n");
 333         }
 334
 335         /*
 336          ** COR 4 (there is no COR 3)
 337          */
 338         if (TtyP->termios->c_iflag & IGNBRK) {
 339                 rio_dprintk(RIO_DEBUG_PARAM, "Ignore break condition\n");
 340                 Cor4 |= RIOC_COR4_IGNBRK;
 341         }
 342         if (!(TtyP->termios->c_iflag & BRKINT)) {
 343                 rio_dprintk(RIO_DEBUG_PARAM, "Break generates NULL condition\n");
 344                 Cor4 |= RIOC_COR4_NBRKINT;
 345         } else {
 346                 rio_dprintk(RIO_DEBUG_PARAM, "Interrupt on      break condition\n");
 347         }
 348
 349         if (TtyP->termios->c_iflag & INLCR) {
 350                 rio_dprintk(RIO_DEBUG_PARAM, "Map newline to carriage return on input\n");
 351                 Cor4 |= RIOC_COR4_INLCR;
 352         }
 353
 354         if (TtyP->termios->c_iflag & IGNCR) {
 355                 rio_dprintk(RIO_DEBUG_PARAM, "Ignore carriage return on input\n");
 356                 Cor4 |= RIOC_COR4_IGNCR;
 357         }
 358
 359         if (TtyP->termios->c_iflag & ICRNL) {
 360                 rio_dprintk(RIO_DEBUG_PARAM, "Map carriage return to newline on input\n");
 361                 Cor4 |= RIOC_COR4_ICRNL;
 362         }
 363         if (TtyP->termios->c_iflag & IGNPAR) {
 364                 rio_dprintk(RIO_DEBUG_PARAM, "Ignore characters with parity errors\n");
 365                 Cor4 |= RIOC_COR4_IGNPAR;
 366         }
 367         if (TtyP->termios->c_iflag & PARMRK) {
 368                 rio_dprintk(RIO_DEBUG_PARAM, "Mark parity errors\n");
 369                 Cor4 |= RIOC_COR4_PARMRK;
 370         }
 371
 372         /*
 373          ** Set the RAISEMOD flag to ensure that the modem lines are raised
 374          ** on reception of a config packet.
 375          ** The download code handles the zero baud condition.
 376          */
 377         Cor4 |= RIOC_COR4_RAISEMOD;
 378
 379         /*
 380          ** COR 5
 381          */
 382
 383         Cor5 = RIOC_COR5_CMOE;
 384
 385         /*
 386          ** Set to monitor tbusy/tstop (or not).
 387          */
 388
 389         if (PortP->MonitorTstate)
 390                 Cor5 |= RIOC_COR5_TSTATE_ON;
 391         else
 392                 Cor5 |= RIOC_COR5_TSTATE_OFF;
 393
 394         /*
 395          ** Could set LNE here if you wanted LNext processing. SVR4 will use it.
 396          */
 397         if (TtyP->termios->c_iflag & ISTRIP) {
 398                 rio_dprintk(RIO_DEBUG_PARAM, "Strip input characters\n");
 399                 if (!(PortP->State & RIO_TRIAD_MODE)) {
 400                         Cor5 |= RIOC_COR5_ISTRIP;
 401                 }
 402         }
 403
 404         if (TtyP->termios->c_oflag & ONLCR) {
 405                 rio_dprintk(RIO_DEBUG_PARAM, "Map newline to carriage-return, newline on output\n");
 406                 if (PortP->CookMode == COOK_MEDIUM)
 407                         Cor5 |= RIOC_COR5_ONLCR;
 408         }
 409         if (TtyP->termios->c_oflag & OCRNL) {
 410                 rio_dprintk(RIO_DEBUG_PARAM, "Map carriage return to newline on output\n");
 411                 if (PortP->CookMode == COOK_MEDIUM)
 412                         Cor5 |= RIOC_COR5_OCRNL;
 413         }
 414         if ((TtyP->termios->c_oflag & TABDLY) == TAB3) {
 415                 rio_dprintk(RIO_DEBUG_PARAM, "Tab delay 3 set\n");
 416                 if (PortP->CookMode == COOK_MEDIUM)
 417                         Cor5 |= RIOC_COR5_TAB3;
 418         }
 419
 420         /*
 421          ** Flow control bytes.
 422          */
 423         TxXon = TtyP->termios->c_cc[VSTART];
 424         TxXoff = TtyP->termios->c_cc[VSTOP];
 425         RxXon = TtyP->termios->c_cc[VSTART];
 426         RxXoff = TtyP->termios->c_cc[VSTOP];
 427         /*
 428          ** LNEXT byte
 429          */
 430         LNext = 0;
 431
 432         /*
 433          ** Baud rate bytes
 434          */
 435         rio_dprintk(RIO_DEBUG_PARAM, "Mapping of rx/tx baud %x (%x)\n", TtyP->termios->c_cflag, CBAUD);
 436
 437         switch (TtyP->termios->c_cflag & CBAUD) {
 438 #define e(b) case B ## b : RxBaud = TxBaud = RIO_B ## b ;break
 439                 e(50);
 440                 e(75);
 441                 e(110);
 442                 e(134);
 443                 e(150);
 444                 e(200);
 445                 e(300);
 446                 e(600);
 447                 e(1200);
 448                 e(1800);
 449                 e(2400);
 450                 e(4800);
 451                 e(9600);
 452                 e(19200);
 453                 e(38400);
 454                 e(57600);
 455                 e(115200);      /* e(230400);e(460800); e(921600);  */
 456         }
 457
 458         rio_dprintk(RIO_DEBUG_PARAM, "tx baud 0x%x, rx baud 0x%x\n", TxBaud, RxBaud);
 459
 460
 461         /*
 462          ** Leftovers
 463          */
 464         if (TtyP->termios->c_cflag & CREAD)
 465                 rio_dprintk(RIO_DEBUG_PARAM, "Enable receiver\n");
 466 #ifdef RCV1EN
 467         if (TtyP->termios->c_cflag & RCV1EN)
 468                 rio_dprintk(RIO_DEBUG_PARAM, "RCV1EN (?)\n");
 469 #endif
 470 #ifdef XMT1EN
 471         if (TtyP->termios->c_cflag & XMT1EN)
 472                 rio_dprintk(RIO_DEBUG_PARAM, "XMT1EN (?)\n");
 473 #endif
 474         if (TtyP->termios->c_lflag & ISIG)
 475                 rio_dprintk(RIO_DEBUG_PARAM, "Input character signal generating enabled\n");
 476         if (TtyP->termios->c_lflag & ICANON)
 477                 rio_dprintk(RIO_DEBUG_PARAM, "Canonical input: erase and kill enabled\n");
 478         if (TtyP->termios->c_lflag & XCASE)
 479                 rio_dprintk(RIO_DEBUG_PARAM, "Canonical upper/lower presentation\n");
 480         if (TtyP->termios->c_lflag & ECHO)
 481                 rio_dprintk(RIO_DEBUG_PARAM, "Enable input echo\n");
 482         if (TtyP->termios->c_lflag & ECHOE)
 483                 rio_dprintk(RIO_DEBUG_PARAM, "Enable echo erase\n");
 484         if (TtyP->termios->c_lflag & ECHOK)
 485                 rio_dprintk(RIO_DEBUG_PARAM, "Enable echo kill\n");
 486         if (TtyP->termios->c_lflag & ECHONL)
 487                 rio_dprintk(RIO_DEBUG_PARAM, "Enable echo newline\n");
 488         if (TtyP->termios->c_lflag & NOFLSH)
 489                 rio_dprintk(RIO_DEBUG_PARAM, "Disable flush after interrupt or quit\n");
 490 #ifdef TOSTOP
 491         if (TtyP->termios->c_lflag & TOSTOP)
 492                 rio_dprintk(RIO_DEBUG_PARAM, "Send SIGTTOU for background output\n");
 493 #endif
 494 #ifdef XCLUDE
 495         if (TtyP->termios->c_lflag & XCLUDE)
 496                 rio_dprintk(RIO_DEBUG_PARAM, "Exclusive use of this line\n");
 497 #endif
 498         if (TtyP->termios->c_iflag & IUCLC)
 499                 rio_dprintk(RIO_DEBUG_PARAM, "Map uppercase to lowercase on input\n");
 500         if (TtyP->termios->c_oflag & OPOST)
 501                 rio_dprintk(RIO_DEBUG_PARAM, "Enable output post-processing\n");
 502         if (TtyP->termios->c_oflag & OLCUC)
 503                 rio_dprintk(RIO_DEBUG_PARAM, "Map lowercase to uppercase on output\n");
 504         if (TtyP->termios->c_oflag & ONOCR)
 505                 rio_dprintk(RIO_DEBUG_PARAM, "No carriage return output at column 0\n");
 506         if (TtyP->termios->c_oflag & ONLRET)
 507                 rio_dprintk(RIO_DEBUG_PARAM, "Newline performs carriage return function\n");
 508         if (TtyP->termios->c_oflag & OFILL)
 509                 rio_dprintk(RIO_DEBUG_PARAM, "Use fill characters for delay\n");
 510         if (TtyP->termios->c_oflag & OFDEL)
 511                 rio_dprintk(RIO_DEBUG_PARAM, "Fill character is DEL\n");
 512         if (TtyP->termios->c_oflag & NLDLY)
 513                 rio_dprintk(RIO_DEBUG_PARAM, "Newline delay set\n");
 514         if (TtyP->termios->c_oflag & CRDLY)
 515                 rio_dprintk(RIO_DEBUG_PARAM, "Carriage return delay set\n");
 516         if (TtyP->termios->c_oflag & TABDLY)
 517                 rio_dprintk(RIO_DEBUG_PARAM, "Tab delay set\n");
 518         /*
 519          ** These things are kind of useful in a later life!
 520          */
 521         PortP->Cor2Copy = Cor2;
 522
 523         if (PortP->State & RIO_DELETED) {
 524                 rio_spin_unlock_irqrestore(&PortP->portSem, flags);
 525                 func_exit();
 526
 527                 return RIO_FAIL;
 528         }
 529
 530         /*
 531          ** Actually write the info into the packet to be sent
 532          */
 533         writeb(cmd, &phb_param_ptr->Cmd);
 534         writeb(Cor1, &phb_param_ptr->Cor1);
 535         writeb(Cor2, &phb_param_ptr->Cor2);
 536         writeb(Cor4, &phb_param_ptr->Cor4);
 537         writeb(Cor5, &phb_param_ptr->Cor5);
 538         writeb(TxXon, &phb_param_ptr->TxXon);
 539         writeb(RxXon, &phb_param_ptr->RxXon);
 540         writeb(TxXoff, &phb_param_ptr->TxXoff);
 541         writeb(RxXoff, &phb_param_ptr->RxXoff);
 542         writeb(LNext, &phb_param_ptr->LNext);
 543         writeb(TxBaud, &phb_param_ptr->TxBaud);
 544         writeb(RxBaud, &phb_param_ptr->RxBaud);
 545
 546         /*
 547          ** Set the length/command field
 548          */
 549         writeb(12 | PKT_CMD_BIT, &PacketP->len);
 550
 551         /*
 552          ** The packet is formed - now, whack it off
 553          ** to its final destination:
 554          */
 555         add_transmit(PortP);
 556         /*
 557          ** Count characters transmitted for port statistics reporting
 558          */
 559         if (PortP->statsGather)
 560                 PortP->txchars += 12;
 561
 562         rio_spin_unlock_irqrestore(&PortP->portSem, flags);
 563
 564         rio_dprintk(RIO_DEBUG_PARAM, "add_transmit returned.\n");
 565         /*
 566          ** job done.
 567          */
 568         func_exit();
 569
 570         return 0;
 571 }
 572
 573
 574 /*
 575 ** We can add another packet to a transmit queue if the packet pointer pointed
 576 ** to by the TxAdd pointer has PKT_IN_USE clear in its address.
 577 */
 578 int can_add_transmit(struct PKT __iomem **PktP, struct Port *PortP)
 579 {
 580         struct PKT __iomem *tp;
 581
 582         *PktP = tp = (struct PKT __iomem *) RIO_PTR(PortP->Caddr, readw(PortP->TxAdd));
 583
 584         return !((unsigned long) tp & PKT_IN_USE);
 585 }
 586
 587 /*
 588 ** To add a packet to the queue, you set the PKT_IN_USE bit in the address,
 589 ** and then move the TxAdd pointer along one position to point to the next
 590 ** packet pointer. You must wrap the pointer from the end back to the start.
 591 */
 592 void add_transmit(struct Port *PortP)
 593 {
 594         if (readw(PortP->TxAdd) & PKT_IN_USE) {
 595                 rio_dprintk(RIO_DEBUG_PARAM, "add_transmit: Packet has been stolen!");
 596         }
 597         writew(readw(PortP->TxAdd) | PKT_IN_USE, PortP->TxAdd);
 598         PortP->TxAdd = (PortP->TxAdd == PortP->TxEnd) ? PortP->TxStart : PortP->TxAdd + 1;
 599         writew(RIO_OFF(PortP->Caddr, PortP->TxAdd), &PortP->PhbP->tx_add);
 600 }
 601
 602 /****************************************
 603  * Put a packet onto the end of the
 604  * free list
 605  ****************************************/
 606 void put_free_end(struct Host *HostP, struct PKT __iomem *PktP)
 607 {
 608         struct rio_free_list __iomem *tmp_pointer;
 609         unsigned short old_end, new_end;
 610         unsigned long flags;
 611
 612         rio_spin_lock_irqsave(&HostP->HostLock, flags);
 613
 614          /*************************************************
 615         * Put a packet back onto the back of the free list
 616         *
 617         ************************************************/
 618
 619         rio_dprintk(RIO_DEBUG_PFE, "put_free_end(PktP=%p)\n", PktP);
 620
 621         if ((old_end = readw(&HostP->ParmMapP->free_list_end)) != TPNULL) {
 622                 new_end = RIO_OFF(HostP->Caddr, PktP);
 623                 tmp_pointer = (struct rio_free_list __iomem *) RIO_PTR(HostP->Caddr, old_end);
 624                 writew(new_end, &tmp_pointer->next);
 625                 writew(old_end, &((struct rio_free_list __iomem *) PktP)->prev);
 626                 writew(TPNULL, &((struct rio_free_list __iomem *) PktP)->next);
 627                 writew(new_end, &HostP->ParmMapP->free_list_end);
 628         } else {                /* First packet on the free list this should never happen! */
 629                 rio_dprintk(RIO_DEBUG_PFE, "put_free_end(): This should never happen\n");
 630                 writew(RIO_OFF(HostP->Caddr, PktP), &HostP->ParmMapP->free_list_end);
 631                 tmp_pointer = (struct rio_free_list __iomem *) PktP;
 632                 writew(TPNULL, &tmp_pointer->prev);
 633                 writew(TPNULL, &tmp_pointer->next);
 634         }
 635         rio_dprintk(RIO_DEBUG_CMD, "Before unlock: %p\n", &HostP->HostLock);
 636         rio_spin_unlock_irqrestore(&HostP->HostLock, flags);
 637 }
 638
 639 /*
 640 ** can_remove_receive(PktP,P) returns non-zero if PKT_IN_USE is set
 641 ** for the next packet on the queue. It will also set PktP to point to the
 642 ** relevant packet, [having cleared the PKT_IN_USE bit]. If PKT_IN_USE is clear,
 643 ** then can_remove_receive() returns 0.
 644 */
 645 int can_remove_receive(struct PKT __iomem **PktP, struct Port *PortP)
 646 {
 647         if (readw(PortP->RxRemove) & PKT_IN_USE) {
 648                 *PktP = (struct PKT __iomem *) RIO_PTR(PortP->Caddr, readw(PortP->RxRemove) & ~PKT_IN_USE);
 649                 return 1;
 650         }
 651         return 0;
 652 }
 653
 654 /*
 655 ** To remove a packet from the receive queue you clear its PKT_IN_USE bit,
 656 ** and then bump the pointers. Once the pointers get to the end, they must
 657 ** be wrapped back to the start.
 658 */
 659 void remove_receive(struct Port *PortP)
 660 {
 661         writew(readw(PortP->RxRemove) & ~PKT_IN_USE, PortP->RxRemove);
 662         PortP->RxRemove = (PortP->RxRemove == PortP->RxEnd) ? PortP->RxStart : PortP->RxRemove + 1;
 663         writew(RIO_OFF(PortP->Caddr, PortP->RxRemove), &PortP->PhbP->rx_remove);
 664 }