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/semaphore.h>
  45 #include <asm/uaccess.h>
  46
  47 #include <linux/termios.h>
  48 #include <linux/serial.h>
  49
  50 #include <linux/generic_serial.h>
  51
  52
  53 #include "linux_compat.h"
  54 #include "rio_linux.h"
  55 #include "pkt.h"
  56 #include "daemon.h"
  57 #include "rio.h"
  58 #include "riospace.h"
  59 #include "cmdpkt.h"
  60 #include "map.h"
  61 #include "rup.h"
  62 #include "port.h"
  63 #include "riodrvr.h"
  64 #include "rioinfo.h"
  65 #include "func.h"
  66 #include "errors.h"
  67 #include "pci.h"
  68
  69 #include "parmmap.h"
  70 #include "unixrup.h"
  71 #include "board.h"
  72 #include "host.h"
  73 #include "phb.h"
  74 #include "link.h"
  75 #include "cmdblk.h"
  76 #include "route.h"
  77 #include "cirrus.h"
  78 #include "rioioctl.h"
  79 #include "param.h"
  80
  81
  82
  83 /*
  84 ** The Scam, based on email from jeremyr@bugs.specialix.co.uk....
  85 **
  86 ** To send a command on a particular port, you put a packet with the
  87 ** command bit set onto the port. The command bit is in the len field,
  88 ** and gets ORed in with the actual byte count.
  89 **
  90 ** When you send a packet with the command bit set the first
  91 ** data byte (data[0]) is interpreted as the command to execute.
  92 ** It also governs what data structure overlay should accompany the packet.
  93 ** Commands are defined in cirrus/cirrus.h
  94 **
  95 ** If you want the command to pre-emt data already on the queue for the
  96 ** port, set the pre-emptive bit in conjunction with the command bit.
  97 ** It is not defined what will happen if you set the preemptive bit
  98 ** on a packet that is NOT a command.
  99 **
 100 ** Pre-emptive commands should be queued at the head of the queue using
 101 ** add_start(), whereas normal commands and data are enqueued using
 102 ** add_end().
 103 **
 104 ** Most commands do not use the remaining bytes in the data array. The
 105 ** exceptions are OPEN MOPEN and CONFIG. (NB. As with the SI CONFIG and
 106 ** OPEN are currently analogous). With these three commands the following
 107 ** 11 data bytes are all used to pass config information such as baud rate etc.
 108 ** The fields are also defined in cirrus.h. Some contain straightforward
 109 ** information such as the transmit XON character. Two contain the transmit and
 110 ** receive baud rates respectively. For most baud rates there is a direct
 111 ** mapping between the rates defined in <sys/termio.h> and the byte in the
 112 ** packet. There are additional (non UNIX-standard) rates defined in
 113 ** /u/dos/rio/cirrus/h/brates.h.
 114 **
 115 ** The rest of the data fields contain approximations to the Cirrus registers
 116 ** that are used to program number of bits etc. Each registers bit fields is
 117 ** defined in cirrus.h.
 118 **
 119 ** NB. Only use those bits that are defined as being driver specific
 120 ** or common to the RTA and the driver.
 121 **
 122 ** All commands going from RTA->Host will be dealt with by the Host code - you
 123 ** will never see them. As with the SI there will be three fields to look out
 124 ** for in each phb (not yet defined - needs defining a.s.a.p).
 125 **
 126 ** modem_status - current state of handshake pins.
 127 **
 128 ** port_status   - current port status - equivalent to hi_stat for SI, indicates
 129 ** if port is IDLE_OPEN, IDLE_CLOSED etc.
 130 **
 131 ** break_status - bit X set if break has been received.
 132 **
 133 ** Happy hacking.
 134 **
 135 */
 136
 137 /*
 138 ** RIOParam is used to open or configure a port. You pass it a PortP,
 139 ** which will have a tty struct attached to it. You also pass a command,
 140 ** either OPEN or CONFIG. The port's setup is taken from the t_ fields
 141 ** of the tty struct inside the PortP, and the port is either opened
 142 ** or re-configured. You must also tell RIOParam if the device is a modem
 143 ** device or not (i.e. top bit of minor number set or clear - take special
 144 ** care when deciding on this!).
 145 ** RIOParam neither flushes nor waits for drain, and is NOT preemptive.
 146 **
 147 ** RIOParam assumes it will be called at splrio(), and also assumes
 148 ** that CookMode is set correctly in the port structure.
 149 **
 150 ** NB. for MPX
 151 **      tty lock must NOT have been previously acquired.
 152 */
 153 int RIOParam(struct Port *PortP, int cmd, int Modem, int SleepFlag)
 154 {
 155         struct tty_struct *TtyP;
 156         int retval;
 157         struct phb_param __iomem *phb_param_ptr;
 158         struct PKT __iomem *PacketP;
 159         int res;
 160         u8 Cor1 = 0, Cor2 = 0, Cor4 = 0, Cor5 = 0;
 161         u8 TxXon = 0, TxXoff = 0, RxXon = 0, RxXoff = 0;
 162         u8 LNext = 0, TxBaud = 0, RxBaud = 0;
 163         int retries = 0xff;
 164         unsigned long flags;
 165
 166         func_enter();
 167
 168         TtyP = PortP->gs.tty;
 169
 170         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);
 171
 172         if (!TtyP) {
 173                 rio_dprintk(RIO_DEBUG_PARAM, "Can't call rioparam with null tty.\n");
 174
 175                 func_exit();
 176
 177                 return RIO_FAIL;
 178         }
 179         rio_spin_lock_irqsave(&PortP->portSem, flags);
 180
 181         if (cmd == OPEN) {
 182                 /*
 183                  ** If the port is set to store or lock the parameters, and it is
 184                  ** paramed with OPEN, we want to restore the saved port termio, but
 185                  ** only if StoredTermio has been saved, i.e. NOT 1st open after reboot.
 186                  */
 187         }
 188
 189         /*
 190          ** wait for space
 191          */
 192         while (!(res = can_add_transmit(&PacketP, PortP)) || (PortP->InUse != NOT_INUSE)) {
 193                 if (retries-- <= 0) {
 194                         break;
 195                 }
 196                 if (PortP->InUse != NOT_INUSE) {
 197                         rio_dprintk(RIO_DEBUG_PARAM, "Port IN_USE for pre-emptive command\n");
 198                 }
 199
 200                 if (!res) {
 201                         rio_dprintk(RIO_DEBUG_PARAM, "Port has no space on transmit queue\n");
 202                 }
 203
 204                 if (SleepFlag != OK_TO_SLEEP) {
 205                         rio_spin_unlock_irqrestore(&PortP->portSem, flags);
 206                         func_exit();
 207
 208                         return RIO_FAIL;
 209                 }
 210
 211                 rio_dprintk(RIO_DEBUG_PARAM, "wait for can_add_transmit\n");
 212                 rio_spin_unlock_irqrestore(&PortP->portSem, flags);
 213                 retval = RIODelay(PortP, HUNDRED_MS);
 214                 rio_spin_lock_irqsave(&PortP->portSem, flags);
 215                 if (retval == RIO_FAIL) {
 216                         rio_dprintk(RIO_DEBUG_PARAM, "wait for can_add_transmit broken by signal\n");
 217                         rio_spin_unlock_irqrestore(&PortP->portSem, flags);
 218                         func_exit();
 219                         return -EINTR;
 220                 }
 221                 if (PortP->State & RIO_DELETED) {
 222                         rio_spin_unlock_irqrestore(&PortP->portSem, flags);
 223                         func_exit();
 224                         return 0;
 225                 }
 226         }
 227
 228         if (!res) {
 229                 rio_spin_unlock_irqrestore(&PortP->portSem, flags);
 230                 func_exit();
 231
 232                 return RIO_FAIL;
 233         }
 234
 235         rio_dprintk(RIO_DEBUG_PARAM, "can_add_transmit() returns %x\n", res);
 236         rio_dprintk(RIO_DEBUG_PARAM, "Packet is %p\n", PacketP);
 237
 238         phb_param_ptr = (struct phb_param __iomem *) PacketP->data;
 239
 240
 241         switch (TtyP->termios->c_cflag & CSIZE) {
 242         case CS5:
 243                 {
 244                         rio_dprintk(RIO_DEBUG_PARAM, "5 bit data\n");
 245                         Cor1 |= COR1_5BITS;
 246                         break;
 247                 }
 248         case CS6:
 249                 {
 250                         rio_dprintk(RIO_DEBUG_PARAM, "6 bit data\n");
 251                         Cor1 |= COR1_6BITS;
 252                         break;
 253                 }
 254         case CS7:
 255                 {
 256                         rio_dprintk(RIO_DEBUG_PARAM, "7 bit data\n");
 257                         Cor1 |= COR1_7BITS;
 258                         break;
 259                 }
 260         case CS8:
 261                 {
 262                         rio_dprintk(RIO_DEBUG_PARAM, "8 bit data\n");
 263                         Cor1 |= COR1_8BITS;
 264                         break;
 265                 }
 266         }
 267
 268         if (TtyP->termios->c_cflag & CSTOPB) {
 269                 rio_dprintk(RIO_DEBUG_PARAM, "2 stop bits\n");
 270                 Cor1 |= COR1_2STOP;
 271         } else {
 272                 rio_dprintk(RIO_DEBUG_PARAM, "1 stop bit\n");
 273                 Cor1 |= COR1_1STOP;
 274         }
 275
 276         if (TtyP->termios->c_cflag & PARENB) {
 277                 rio_dprintk(RIO_DEBUG_PARAM, "Enable parity\n");
 278                 Cor1 |= COR1_NORMAL;
 279         } else {
 280                 rio_dprintk(RIO_DEBUG_PARAM, "Disable parity\n");
 281                 Cor1 |= COR1_NOP;
 282         }
 283         if (TtyP->termios->c_cflag & PARODD) {
 284                 rio_dprintk(RIO_DEBUG_PARAM, "Odd parity\n");
 285                 Cor1 |= COR1_ODD;
 286         } else {
 287                 rio_dprintk(RIO_DEBUG_PARAM, "Even parity\n");
 288                 Cor1 |= COR1_EVEN;
 289         }
 290
 291         /*
 292          ** COR 2
 293          */
 294         if (TtyP->termios->c_iflag & IXON) {
 295                 rio_dprintk(RIO_DEBUG_PARAM, "Enable start/stop output control\n");
 296                 Cor2 |= COR2_IXON;
 297         } else {
 298                 if (PortP->Config & RIO_IXON) {
 299                         rio_dprintk(RIO_DEBUG_PARAM, "Force enable start/stop output control\n");
 300                         Cor2 |= COR2_IXON;
 301                 } else
 302                         rio_dprintk(RIO_DEBUG_PARAM, "IXON has been disabled.\n");
 303         }
 304
 305         if (TtyP->termios->c_iflag & IXANY) {
 306                 if (PortP->Config & RIO_IXANY) {
 307                         rio_dprintk(RIO_DEBUG_PARAM, "Enable any key to restart output\n");
 308                         Cor2 |= COR2_IXANY;
 309                 } else
 310                         rio_dprintk(RIO_DEBUG_PARAM, "IXANY has been disabled due to sanity reasons.\n");
 311         }
 312
 313         if (TtyP->termios->c_iflag & IXOFF) {
 314                 rio_dprintk(RIO_DEBUG_PARAM, "Enable start/stop input control 2\n");
 315                 Cor2 |= COR2_IXOFF;
 316         }
 317
 318         if (TtyP->termios->c_cflag & HUPCL) {
 319                 rio_dprintk(RIO_DEBUG_PARAM, "Hangup on last close\n");
 320                 Cor2 |= COR2_HUPCL;
 321         }
 322
 323         if (C_CRTSCTS(TtyP)) {
 324                 rio_dprintk(RIO_DEBUG_PARAM, "Rx hardware flow control enabled\n");
 325                 Cor2 |= COR2_CTSFLOW;
 326                 Cor2 |= COR2_RTSFLOW;
 327         } else {
 328                 rio_dprintk(RIO_DEBUG_PARAM, "Rx hardware flow control disabled\n");
 329                 Cor2 &= ~COR2_CTSFLOW;
 330                 Cor2 &= ~COR2_RTSFLOW;
 331         }
 332
 333
 334         if (TtyP->termios->c_cflag & CLOCAL) {
 335                 rio_dprintk(RIO_DEBUG_PARAM, "Local line\n");
 336         } else {
 337                 rio_dprintk(RIO_DEBUG_PARAM, "Possible Modem line\n");
 338         }
 339
 340         /*
 341          ** COR 4 (there is no COR 3)
 342          */
 343         if (TtyP->termios->c_iflag & IGNBRK) {
 344                 rio_dprintk(RIO_DEBUG_PARAM, "Ignore break condition\n");
 345                 Cor4 |= COR4_IGNBRK;
 346         }
 347         if (!(TtyP->termios->c_iflag & BRKINT)) {
 348                 rio_dprintk(RIO_DEBUG_PARAM, "Break generates NULL condition\n");
 349                 Cor4 |= COR4_NBRKINT;
 350         } else {
 351                 rio_dprintk(RIO_DEBUG_PARAM, "Interrupt on      break condition\n");
 352         }
 353
 354         if (TtyP->termios->c_iflag & INLCR) {
 355                 rio_dprintk(RIO_DEBUG_PARAM, "Map newline to carriage return on input\n");
 356                 Cor4 |= COR4_INLCR;
 357         }
 358
 359         if (TtyP->termios->c_iflag & IGNCR) {
 360                 rio_dprintk(RIO_DEBUG_PARAM, "Ignore carriage return on input\n");
 361                 Cor4 |= COR4_IGNCR;
 362         }
 363
 364         if (TtyP->termios->c_iflag & ICRNL) {
 365                 rio_dprintk(RIO_DEBUG_PARAM, "Map carriage return to newline on input\n");
 366                 Cor4 |= COR4_ICRNL;
 367         }
 368         if (TtyP->termios->c_iflag & IGNPAR) {
 369                 rio_dprintk(RIO_DEBUG_PARAM, "Ignore characters with parity errors\n");
 370                 Cor4 |= COR4_IGNPAR;
 371         }
 372         if (TtyP->termios->c_iflag & PARMRK) {
 373                 rio_dprintk(RIO_DEBUG_PARAM, "Mark parity errors\n");
 374                 Cor4 |= COR4_PARMRK;
 375         }
 376
 377         /*
 378          ** Set the RAISEMOD flag to ensure that the modem lines are raised
 379          ** on reception of a config packet.
 380          ** The download code handles the zero baud condition.
 381          */
 382         Cor4 |= COR4_RAISEMOD;
 383
 384         /*
 385          ** COR 5
 386          */
 387
 388         Cor5 = COR5_CMOE;
 389
 390         /*
 391          ** Set to monitor tbusy/tstop (or not).
 392          */
 393
 394         if (PortP->MonitorTstate)
 395                 Cor5 |= COR5_TSTATE_ON;
 396         else
 397                 Cor5 |= COR5_TSTATE_OFF;
 398
 399         /*
 400          ** Could set LNE here if you wanted LNext processing. SVR4 will use it.
 401          */
 402         if (TtyP->termios->c_iflag & ISTRIP) {
 403                 rio_dprintk(RIO_DEBUG_PARAM, "Strip input characters\n");
 404                 if (!(PortP->State & RIO_TRIAD_MODE)) {
 405                         Cor5 |= COR5_ISTRIP;
 406                 }
 407         }
 408
 409         if (TtyP->termios->c_oflag & ONLCR) {
 410                 rio_dprintk(RIO_DEBUG_PARAM, "Map newline to carriage-return, newline on output\n");
 411                 if (PortP->CookMode == COOK_MEDIUM)
 412                         Cor5 |= COR5_ONLCR;
 413         }
 414         if (TtyP->termios->c_oflag & OCRNL) {
 415                 rio_dprintk(RIO_DEBUG_PARAM, "Map carriage return to newline on output\n");
 416                 if (PortP->CookMode == COOK_MEDIUM)
 417                         Cor5 |= COR5_OCRNL;
 418         }
 419         if ((TtyP->termios->c_oflag & TABDLY) == TAB3) {
 420                 rio_dprintk(RIO_DEBUG_PARAM, "Tab delay 3 set\n");
 421                 if (PortP->CookMode == COOK_MEDIUM)
 422                         Cor5 |= COR5_TAB3;
 423         }
 424
 425         /*
 426          ** Flow control bytes.
 427          */
 428         TxXon = TtyP->termios->c_cc[VSTART];
 429         TxXoff = TtyP->termios->c_cc[VSTOP];
 430         RxXon = TtyP->termios->c_cc[VSTART];
 431         RxXoff = TtyP->termios->c_cc[VSTOP];
 432         /*
 433          ** LNEXT byte
 434          */
 435         LNext = 0;
 436
 437         /*
 438          ** Baud rate bytes
 439          */
 440         rio_dprintk(RIO_DEBUG_PARAM, "Mapping of rx/tx baud %x (%x)\n", TtyP->termios->c_cflag, CBAUD);
 441
 442         switch (TtyP->termios->c_cflag & CBAUD) {
 443 #define e(b) case B ## b : RxBaud = TxBaud = RIO_B ## b ;break
 444                 e(50);
 445                 e(75);
 446                 e(110);
 447                 e(134);
 448                 e(150);
 449                 e(200);
 450                 e(300);
 451                 e(600);
 452                 e(1200);
 453                 e(1800);
 454                 e(2400);
 455                 e(4800);
 456                 e(9600);
 457                 e(19200);
 458                 e(38400);
 459                 e(57600);
 460                 e(115200);      /* e(230400);e(460800); e(921600);  */
 461         }
 462
 463         rio_dprintk(RIO_DEBUG_PARAM, "tx baud 0x%x, rx baud 0x%x\n", TxBaud, RxBaud);
 464
 465
 466         /*
 467          ** Leftovers
 468          */
 469         if (TtyP->termios->c_cflag & CREAD)
 470                 rio_dprintk(RIO_DEBUG_PARAM, "Enable receiver\n");
 471 #ifdef RCV1EN
 472         if (TtyP->termios->c_cflag & RCV1EN)
 473                 rio_dprintk(RIO_DEBUG_PARAM, "RCV1EN (?)\n");
 474 #endif
 475 #ifdef XMT1EN
 476         if (TtyP->termios->c_cflag & XMT1EN)
 477                 rio_dprintk(RIO_DEBUG_PARAM, "XMT1EN (?)\n");
 478 #endif
 479         if (TtyP->termios->c_lflag & ISIG)
 480                 rio_dprintk(RIO_DEBUG_PARAM, "Input character signal generating enabled\n");
 481         if (TtyP->termios->c_lflag & ICANON)
 482                 rio_dprintk(RIO_DEBUG_PARAM, "Canonical input: erase and kill enabled\n");
 483         if (TtyP->termios->c_lflag & XCASE)
 484                 rio_dprintk(RIO_DEBUG_PARAM, "Canonical upper/lower presentation\n");
 485         if (TtyP->termios->c_lflag & ECHO)
 486                 rio_dprintk(RIO_DEBUG_PARAM, "Enable input echo\n");
 487         if (TtyP->termios->c_lflag & ECHOE)
 488                 rio_dprintk(RIO_DEBUG_PARAM, "Enable echo erase\n");
 489         if (TtyP->termios->c_lflag & ECHOK)
 490                 rio_dprintk(RIO_DEBUG_PARAM, "Enable echo kill\n");
 491         if (TtyP->termios->c_lflag & ECHONL)
 492                 rio_dprintk(RIO_DEBUG_PARAM, "Enable echo newline\n");
 493         if (TtyP->termios->c_lflag & NOFLSH)
 494                 rio_dprintk(RIO_DEBUG_PARAM, "Disable flush after interrupt or quit\n");
 495 #ifdef TOSTOP
 496         if (TtyP->termios->c_lflag & TOSTOP)
 497                 rio_dprintk(RIO_DEBUG_PARAM, "Send SIGTTOU for background output\n");
 498 #endif
 499 #ifdef XCLUDE
 500         if (TtyP->termios->c_lflag & XCLUDE)
 501                 rio_dprintk(RIO_DEBUG_PARAM, "Exclusive use of this line\n");
 502 #endif
 503         if (TtyP->termios->c_iflag & IUCLC)
 504                 rio_dprintk(RIO_DEBUG_PARAM, "Map uppercase to lowercase on input\n");
 505         if (TtyP->termios->c_oflag & OPOST)
 506                 rio_dprintk(RIO_DEBUG_PARAM, "Enable output post-processing\n");
 507         if (TtyP->termios->c_oflag & OLCUC)
 508                 rio_dprintk(RIO_DEBUG_PARAM, "Map lowercase to uppercase on output\n");
 509         if (TtyP->termios->c_oflag & ONOCR)
 510                 rio_dprintk(RIO_DEBUG_PARAM, "No carriage return output at column 0\n");
 511         if (TtyP->termios->c_oflag & ONLRET)
 512                 rio_dprintk(RIO_DEBUG_PARAM, "Newline performs carriage return function\n");
 513         if (TtyP->termios->c_oflag & OFILL)
 514                 rio_dprintk(RIO_DEBUG_PARAM, "Use fill characters for delay\n");
 515         if (TtyP->termios->c_oflag & OFDEL)
 516                 rio_dprintk(RIO_DEBUG_PARAM, "Fill character is DEL\n");
 517         if (TtyP->termios->c_oflag & NLDLY)
 518                 rio_dprintk(RIO_DEBUG_PARAM, "Newline delay set\n");
 519         if (TtyP->termios->c_oflag & CRDLY)
 520                 rio_dprintk(RIO_DEBUG_PARAM, "Carriage return delay set\n");
 521         if (TtyP->termios->c_oflag & TABDLY)
 522                 rio_dprintk(RIO_DEBUG_PARAM, "Tab delay set\n");
 523         /*
 524          ** These things are kind of useful in a later life!
 525          */
 526         PortP->Cor2Copy = Cor2;
 527
 528         if (PortP->State & RIO_DELETED) {
 529                 rio_spin_unlock_irqrestore(&PortP->portSem, flags);
 530                 func_exit();
 531
 532                 return RIO_FAIL;
 533         }
 534
 535         /*
 536          ** Actually write the info into the packet to be sent
 537          */
 538         writeb(cmd, &phb_param_ptr->Cmd);
 539         writeb(Cor1, &phb_param_ptr->Cor1);
 540         writeb(Cor2, &phb_param_ptr->Cor2);
 541         writeb(Cor4, &phb_param_ptr->Cor4);
 542         writeb(Cor5, &phb_param_ptr->Cor5);
 543         writeb(TxXon, &phb_param_ptr->TxXon);
 544         writeb(RxXon, &phb_param_ptr->RxXon);
 545         writeb(TxXoff, &phb_param_ptr->TxXoff);
 546         writeb(RxXoff, &phb_param_ptr->RxXoff);
 547         writeb(LNext, &phb_param_ptr->LNext);
 548         writeb(TxBaud, &phb_param_ptr->TxBaud);
 549         writeb(RxBaud, &phb_param_ptr->RxBaud);
 550
 551         /*
 552          ** Set the length/command field
 553          */
 554         writeb(12 | PKT_CMD_BIT, &PacketP->len);
 555
 556         /*
 557          ** The packet is formed - now, whack it off
 558          ** to its final destination:
 559          */
 560         add_transmit(PortP);
 561         /*
 562          ** Count characters transmitted for port statistics reporting
 563          */
 564         if (PortP->statsGather)
 565                 PortP->txchars += 12;
 566
 567         rio_spin_unlock_irqrestore(&PortP->portSem, flags);
 568
 569         rio_dprintk(RIO_DEBUG_PARAM, "add_transmit returned.\n");
 570         /*
 571          ** job done.
 572          */
 573         func_exit();
 574
 575         return 0;
 576 }
 577
 578
 579 /*
 580 ** We can add another packet to a transmit queue if the packet pointer pointed
 581 ** to by the TxAdd pointer has PKT_IN_USE clear in its address.
 582 */
 583 int can_add_transmit(struct PKT __iomem **PktP, struct Port *PortP)
 584 {
 585         struct PKT __iomem *tp;
 586
 587         *PktP = tp = (struct PKT __iomem *) RIO_PTR(PortP->Caddr, readw(PortP->TxAdd));
 588
 589         return !((unsigned long) tp & PKT_IN_USE);
 590 }
 591
 592 /*
 593 ** To add a packet to the queue, you set the PKT_IN_USE bit in the address,
 594 ** and then move the TxAdd pointer along one position to point to the next
 595 ** packet pointer. You must wrap the pointer from the end back to the start.
 596 */
 597 void add_transmit(struct Port *PortP)
 598 {
 599         if (readw(PortP->TxAdd) & PKT_IN_USE) {
 600                 rio_dprintk(RIO_DEBUG_PARAM, "add_transmit: Packet has been stolen!");
 601         }
 602         writew(readw(PortP->TxAdd) | PKT_IN_USE, PortP->TxAdd);
 603         PortP->TxAdd = (PortP->TxAdd == PortP->TxEnd) ? PortP->TxStart : PortP->TxAdd + 1;
 604         writew(RIO_OFF(PortP->Caddr, PortP->TxAdd), &PortP->PhbP->tx_add);
 605 }
 606
 607 /****************************************
 608  * Put a packet onto the end of the
 609  * free list
 610  ****************************************/
 611 void put_free_end(struct Host *HostP, struct PKT __iomem *PktP)
 612 {
 613         struct rio_free_list __iomem *tmp_pointer;
 614         unsigned short old_end, new_end;
 615         unsigned long flags;
 616
 617         rio_spin_lock_irqsave(&HostP->HostLock, flags);
 618
 619          /*************************************************
 620         * Put a packet back onto the back of the free list
 621         *
 622         ************************************************/
 623
 624         rio_dprintk(RIO_DEBUG_PFE, "put_free_end(PktP=%p)\n", PktP);
 625
 626         if ((old_end = readw(&HostP->ParmMapP->free_list_end)) != TPNULL) {
 627                 new_end = RIO_OFF(HostP->Caddr, PktP);
 628                 tmp_pointer = (struct rio_free_list __iomem *) RIO_PTR(HostP->Caddr, old_end);
 629                 writew(new_end, &tmp_pointer->next);
 630                 writew(old_end, &((struct rio_free_list __iomem *) PktP)->prev);
 631                 writew(TPNULL, &((struct rio_free_list __iomem *) PktP)->next);
 632                 writew(new_end, &HostP->ParmMapP->free_list_end);
 633         } else {                /* First packet on the free list this should never happen! */
 634                 rio_dprintk(RIO_DEBUG_PFE, "put_free_end(): This should never happen\n");
 635                 writew(RIO_OFF(HostP->Caddr, PktP), &HostP->ParmMapP->free_list_end);
 636                 tmp_pointer = (struct rio_free_list __iomem *) PktP;
 637                 writew(TPNULL, &tmp_pointer->prev);
 638                 writew(TPNULL, &tmp_pointer->next);
 639         }
 640         rio_dprintk(RIO_DEBUG_CMD, "Before unlock: %p\n", &HostP->HostLock);
 641         rio_spin_unlock_irqrestore(&HostP->HostLock, flags);
 642 }
 643
 644 /*
 645 ** can_remove_receive(PktP,P) returns non-zero if PKT_IN_USE is set
 646 ** for the next packet on the queue. It will also set PktP to point to the
 647 ** relevant packet, [having cleared the PKT_IN_USE bit]. If PKT_IN_USE is clear,
 648 ** then can_remove_receive() returns 0.
 649 */
 650 int can_remove_receive(struct PKT __iomem **PktP, struct Port *PortP)
 651 {
 652         if (readw(PortP->RxRemove) & PKT_IN_USE) {
 653                 *PktP = (struct PKT __iomem *) RIO_PTR(PortP->Caddr, readw(PortP->RxRemove) & ~PKT_IN_USE);
 654                 return 1;
 655         }
 656         return 0;
 657 }
 658
 659 /*
 660 ** To remove a packet from the receive queue you clear its PKT_IN_USE bit,
 661 ** and then bump the pointers. Once the pointers get to the end, they must
 662 ** be wrapped back to the start.
 663 */
 664 void remove_receive(struct Port *PortP)
 665 {
 666         writew(readw(PortP->RxRemove) & ~PKT_IN_USE, PortP->RxRemove);
 667         PortP->RxRemove = (PortP->RxRemove == PortP->RxEnd) ? PortP->RxStart : PortP->RxRemove + 1;
 668         writew(RIO_OFF(PortP->Caddr, PortP->RxRemove), &PortP->PhbP->rx_remove);
 669 }