aboutsummaryrefslogtreecommitdiff
path: root/drivers/char/rio/rioparam.c
blob: 4810b845cc21074f49fc72aba3c0e7aa5637bee6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
/*
** -----------------------------------------------------------------------------
**
**  Perle Specialix driver for Linux
**  Ported from existing RIO Driver for SCO sources.
 *
 *  (C) 1990 - 2000 Specialix International Ltd., Byfleet, Surrey, UK.
 *
 *      This program is free software; you can redistribute it and/or modify
 *      it under the terms of the GNU General Public License as published by
 *      the Free Software Foundation; either version 2 of the License, or
 *      (at your option) any later version.
 *
 *      This program is distributed in the hope that it will be useful,
 *      but WITHOUT ANY WARRANTY; without even the implied warranty of
 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *      GNU General Public License for more details.
 *
 *      You should have received a copy of the GNU General Public License
 *      along with this program; if not, write to the Free Software
 *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
**
**	Module		: rioparam.c
**	SID		: 1.3
**	Last Modified	: 11/6/98 10:33:45
**	Retrieved	: 11/6/98 10:33:50
**
**  ident @(#)rioparam.c	1.3
**
** -----------------------------------------------------------------------------
*/

#ifdef SCCS_LABELS
static char *_rioparam_c_sccs_ = "@(#)rioparam.c	1.3";
#endif

#include <linux/module.h>
#include <linux/slab.h>
#include <linux/errno.h>
#include <linux/tty.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/string.h>
#include <asm/uaccess.h>

#include <linux/termios.h>
#include <linux/serial.h>

#include <linux/generic_serial.h>


#include "linux_compat.h"
#include "rio_linux.h"
#include "pkt.h"
#include "daemon.h"
#include "rio.h"
#include "riospace.h"
#include "cmdpkt.h"
#include "map.h"
#include "rup.h"
#include "port.h"
#include "riodrvr.h"
#include "rioinfo.h"
#include "func.h"
#include "errors.h"
#include "pci.h"

#include "parmmap.h"
#include "unixrup.h"
#include "board.h"
#include "host.h"
#include "phb.h"
#include "link.h"
#include "cmdblk.h"
#include "route.h"
#include "cirrus.h"
#include "rioioctl.h"
#include "param.h"



/*
** The Scam, based on email from jeremyr@bugs.specialix.co.uk....
**
** To send a command on a particular port, you put a packet with the
** command bit set onto the port. The command bit is in the len field,
** and gets ORed in with the actual byte count.
**
** When you send a packet with the command bit set the first
** data byte (data[0]) is interpreted as the command to execute.
** It also governs what data structure overlay should accompany the packet.
** Commands are defined in cirrus/cirrus.h
**
** If you want the command to pre-emt data already on the queue for the
** port, set the pre-emptive bit in conjunction with the command bit.
** It is not defined what will happen if you set the preemptive bit
** on a packet that is NOT a command.
**
** Pre-emptive commands should be queued at the head of the queue using
** add_start(), whereas normal commands and data are enqueued using
** add_end().
**
** Most commands do not use the remaining bytes in the data array. The
** exceptions are OPEN MOPEN and CONFIG. (NB. As with the SI CONFIG and
** OPEN are currently analogous). With these three commands the following
** 11 data bytes are all used to pass config information such as baud rate etc.
** The fields are also defined in cirrus.h. Some contain straightforward
** information such as the transmit XON character. Two contain the transmit and
** receive baud rates respectively. For most baud rates there is a direct
** mapping between the rates defined in <sys/termio.h> and the byte in the
** packet. There are additional (non UNIX-standard) rates defined in
** /u/dos/rio/cirrus/h/brates.h.
**
** The rest of the data fields contain approximations to the Cirrus registers
** that are used to program number of bits etc. Each registers bit fields is
** defined in cirrus.h.
** 
** NB. Only use those bits that are defined as being driver specific
** or common to the RTA and the driver.
** 
** All commands going from RTA->Host will be dealt with by the Host code - you
** will never see them. As with the SI there will be three fields to look out
** for in each phb (not yet defined - needs defining a.s.a.p).
** 
** modem_status	- current state of handshake pins.
**
** port_status	 - current port status - equivalent to hi_stat for SI, indicates
** if port is IDLE_OPEN, IDLE_CLOSED etc.
**
** break_status	- bit X set if break has been received.
** 
** Happy hacking.
** 
*/

/* 
** RIOParam is used to open or configure a port. You pass it a PortP,
** which will have a tty struct attached to it. You also pass a command,
** either OPEN or CONFIG. The port's setup is taken from the t_ fields
** of the tty struct inside the PortP, and the port is either opened
** or re-configured. You must also tell RIOParam if the device is a modem
** device or not (i.e. top bit of minor number set or clear - take special
** care when deciding on this!).
** RIOParam neither flushes nor waits for drain, and is NOT preemptive.
**
** RIOParam assumes it will be called at splrio(), and also assumes
** that CookMode is set correctly in the port structure.
**
** NB. for MPX
**	tty lock must NOT have been previously acquired.
*/
int RIOParam(struct Port *PortP, int cmd, int Modem, int SleepFlag)
{
	struct tty_struct *TtyP;
	int retval;
	struct phb_param __iomem *phb_param_ptr;
	struct PKT __iomem *PacketP;
	int res;
	u8 Cor1 = 0, Cor2 = 0, Cor4 = 0, Cor5 = 0;
	u8 TxXon = 0, TxXoff = 0, RxXon = 0, RxXoff = 0;
	u8 LNext = 0, TxBaud = 0, RxBaud = 0;
	int retries = 0xff;
	unsigned long flags;

	func_enter();

	TtyP = PortP->gs.tty;

	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);

	if (!TtyP) {
		rio_dprintk(RIO_DEBUG_PARAM, "Can't call rioparam with null tty.\n");

		func_exit();

		return RIO_FAIL;
	}
	rio_spin_lock_irqsave(&PortP->portSem, flags);

	if (cmd == RIOC_OPEN) {
		/*
		 ** If the port is set to store or lock the parameters, and it is
		 ** paramed with OPEN, we want to restore the saved port termio, but
		 ** only if StoredTermio has been saved, i.e. NOT 1st open after reboot.
		 */
	}

	/*
	 ** wait for space
	 */
	while (!(res = can_add_transmit(&PacketP, PortP)) || (PortP->InUse != NOT_INUSE)) {
		if (retries-- <= 0) {
			break;
		}
		if (PortP->InUse != NOT_INUSE) {
			rio_dprintk(RIO_DEBUG_PARAM, "Port IN_USE for pre-emptive command\n");
		}

		if (!res) {
			rio_dprintk(RIO_DEBUG_PARAM, "Port has no space on transmit queue\n");
		}

		if (SleepFlag != OK_TO_SLEEP) {
			rio_spin_unlock_irqrestore(&PortP->portSem, flags);
			func_exit();

			return RIO_FAIL;
		}

		rio_dprintk(RIO_DEBUG_PARAM, "wait for can_add_transmit\n");
		rio_spin_unlock_irqrestore(&PortP->portSem, flags);
		retval = RIODelay(PortP, HUNDRED_MS);
		rio_spin_lock_irqsave(&PortP->portSem, flags);
		if (retval == RIO_FAIL) {
			rio_dprintk(RIO_DEBUG_PARAM, "wait for can_add_transmit broken by signal\n");
			rio_spin_unlock_irqrestore(&PortP->portSem, flags);
			func_exit();
			return -EINTR;
		}
		if (PortP->State & RIO_DELETED) {
			rio_spin_unlock_irqrestore(&PortP->portSem, flags);
			func_exit();
			return 0;
		}
	}

	if (!res) {
		rio_spin_unlock_irqrestore(&PortP->portSem, flags);
		func_exit();

		return RIO_FAIL;
	}

	rio_dprintk(RIO_DEBUG_PARAM, "can_add_transmit() returns %x\n", res);
	rio_dprintk(RIO_DEBUG_PARAM, "Packet is %p\n", PacketP);

	phb_param_ptr = (struct phb_param __iomem *) PacketP->data;


	switch (TtyP->termios->c_cflag & CSIZE) {
	case CS5:
		{
			rio_dprintk(RIO_DEBUG_PARAM, "5 bit data\n");
			Cor1 |= RIOC_COR1_5BITS;
			break;
		}
	case CS6:
		{
			rio_dprintk(RIO_DEBUG_PARAM, "6 bit data\n");
			Cor1 |= RIOC_COR1_6BITS;
			break;
		}
	case CS7:
		{
			rio_dprintk(RIO_DEBUG_PARAM, "7 bit data\n");
			Cor1 |= RIOC_COR1_7BITS;
			break;
		}
	case CS8:
		{
			rio_dprintk(RIO_DEBUG_PARAM, "8 bit data\n");
			Cor1 |= RIOC_COR1_8BITS;
			break;
		}
	}

	if (TtyP->termios->c_cflag & CSTOPB) {
		rio_dprintk(RIO_DEBUG_PARAM, "2 stop bits\n");
		Cor1 |= RIOC_COR1_2STOP;
	} else {
		rio_dprintk(RIO_DEBUG_PARAM, "1 stop bit\n");
		Cor1 |= RIOC_COR1_1STOP;
	}

	if (TtyP->termios->c_cflag & PARENB) {
		rio_dprintk(RIO_DEBUG_PARAM, "Enable parity\n");
		Cor1 |= RIOC_COR1_NORMAL;
	} else {
		rio_dprintk(RIO_DEBUG_PARAM, "Disable parity\n");
		Cor1 |= RIOC_COR1_NOP;
	}
	if (TtyP->termios->c_cflag & PARODD) {
		rio_dprintk(RIO_DEBUG_PARAM, "Odd parity\n");
		Cor1 |= RIOC_COR1_ODD;
	} else {
		rio_dprintk(RIO_DEBUG_PARAM, "Even parity\n");
		Cor1 |= RIOC_COR1_EVEN;
	}

	/*
	 ** COR 2
	 */
	if (TtyP->termios->c_iflag & IXON) {
		rio_dprintk(RIO_DEBUG_PARAM, "Enable start/stop output control\n");
		Cor2 |= RIOC_COR2_IXON;
	} else {
		if (PortP->Config & RIO_IXON) {
			rio_dprintk(RIO_DEBUG_PARAM, "Force enable start/stop output control\n");
			Cor2 |= RIOC_COR2_IXON;
		} else
			rio_dprintk(RIO_DEBUG_PARAM, "IXON has been disabled.\n");
	}

	if (TtyP->termios->c_iflag & IXANY) {
		if (PortP->Config & RIO_IXANY) {
			rio_dprintk(RIO_DEBUG_PARAM, "Enable any key to restart output\n");
			Cor2 |= RIOC_COR2_IXANY;
		} else
			rio_dprintk(RIO_DEBUG_PARAM, "IXANY has been disabled due to sanity reasons.\n");
	}

	if (TtyP->termios->c_iflag & IXOFF) {
		rio_dprintk(RIO_DEBUG_PARAM, "Enable start/stop input control 2\n");
		Cor2 |= RIOC_COR2_IXOFF;
	}

	if (TtyP->termios->c_cflag & HUPCL) {
		rio_dprintk(RIO_DEBUG_PARAM, "Hangup on last close\n");
		Cor2 |= RIOC_COR2_HUPCL;
	}

	if (C_CRTSCTS(TtyP)) {
		rio_dprintk(RIO_DEBUG_PARAM, "Rx hardware flow control enabled\n");
		Cor2 |= RIOC_COR2_CTSFLOW;
		Cor2 |= RIOC_COR2_RTSFLOW;
	} else {
		rio_dprintk(RIO_DEBUG_PARAM, "Rx hardware flow control disabled\n");
		Cor2 &= ~RIOC_COR2_CTSFLOW;
		Cor2 &= ~RIOC_COR2_RTSFLOW;
	}


	if (TtyP->termios->c_cflag & CLOCAL) {
		rio_dprintk(RIO_DEBUG_PARAM, "Local line\n");
	} else {
		rio_dprintk(RIO_DEBUG_PARAM, "Possible Modem line\n");
	}

	/*
	 ** COR 4 (there is no COR 3)
	 */
	if (TtyP->termios->c_iflag & IGNBRK) {
		rio_dprintk(RIO_DEBUG_PARAM, "Ignore break condition\n");
		Cor4 |= RIOC_COR4_IGNBRK;
	}
	if (!(TtyP->termios->c_iflag & BRKINT)) {
		rio_dprintk(RIO_DEBUG_PARAM, "Break generates NULL condition\n");
		Cor4 |= RIOC_COR4_NBRKINT;
	} else {
		rio_dprintk(RIO_DEBUG_PARAM, "Interrupt on	break condition\n");
	}

	if (TtyP->termios->c_iflag & INLCR) {
		rio_dprintk(RIO_DEBUG_PARAM, "Map newline to carriage return on input\n");
		Cor4 |= RIOC_COR4_INLCR;
	}

	if (TtyP->termios->c_iflag & IGNCR) {
		rio_dprintk(RIO_DEBUG_PARAM, "Ignore carriage return on input\n");
		Cor4 |= RIOC_COR4_IGNCR;
	}

	if (TtyP->termios->c_iflag & ICRNL) {
		rio_dprintk(RIO_DEBUG_PARAM, "Map carriage return to newline on input\n");
		Cor4 |= RIOC_COR4_ICRNL;
	}
	if (TtyP->termios->c_iflag & IGNPAR) {
		rio_dprintk(RIO_DEBUG_PARAM, "Ignore characters with parity errors\n");
		Cor4 |= RIOC_COR4_IGNPAR;
	}
	if (TtyP->termios->c_iflag & PARMRK) {
		rio_dprintk(RIO_DEBUG_PARAM, "Mark parity errors\n");
		Cor4 |= RIOC_COR4_PARMRK;
	}

	/*
	 ** Set the RAISEMOD flag to ensure that the modem lines are raised
	 ** on reception of a config packet.
	 ** The download code handles the zero baud condition.
	 */
	Cor4 |= RIOC_COR4_RAISEMOD;

	/*
	 ** COR 5
	 */

	Cor5 = RIOC_COR5_CMOE;

	/*
	 ** Set to monitor tbusy/tstop (or not).
	 */

	if (PortP->MonitorTstate)
		Cor5 |= RIOC_COR5_TSTATE_ON;
	else
		Cor5 |= RIOC_COR5_TSTATE_OFF;

	/*
	 ** Could set LNE here if you wanted LNext processing. SVR4 will use it.
	 */
	if (TtyP->termios->c_iflag & ISTRIP) {
		rio_dprintk(RIO_DEBUG_PARAM, "Strip input characters\n");
		if (!(PortP->State & RIO_TRIAD_MODE)) {
			Cor5 |= RIOC_COR5_ISTRIP;
		}
	}

	if (TtyP->termios->c_oflag & ONLCR) {
		rio_dprintk(RIO_DEBUG_PARAM, "Map newline to carriage-return, newline on output\n");
		if (PortP->CookMode == COOK_MEDIUM)
			Cor5 |= RIOC_COR5_ONLCR;
	}
	if (TtyP->termios->c_oflag & OCRNL) {
		rio_dprintk(RIO_DEBUG_PARAM, "Map carriage return to newline on output\n");
		if (PortP->CookMode == COOK_MEDIUM)
			Cor5 |= RIOC_COR5_OCRNL;
	}
	if ((TtyP->termios->c_oflag & TABDLY) == TAB3) {
		rio_dprintk(RIO_DEBUG_PARAM, "Tab delay 3 set\n");
		if (PortP->CookMode == COOK_MEDIUM)
			Cor5 |= RIOC_COR5_TAB3;
	}

	/*
	 ** Flow control bytes.
	 */
	TxXon = TtyP->termios->c_cc[VSTART];
	TxXoff = TtyP->termios->c_cc[VSTOP];
	RxXon = TtyP->termios->c_cc[VSTART];
	RxXoff = TtyP->termios->c_cc[VSTOP];
	/*
	 ** LNEXT byte
	 */
	LNext = 0;

	/*
	 ** Baud rate bytes
	 */
	rio_dprintk(RIO_DEBUG_PARAM, "Mapping of rx/tx baud %x (%x)\n", TtyP->termios->c_cflag, CBAUD);

	switch (TtyP->termios->c_cflag & CBAUD) {
#define e(b) case B ## b : RxBaud = TxBaud = RIO_B ## b ;break
		e(50);
		e(75);
		e(110);
		e(134);
		e(150);
		e(200);
		e(300);
		e(600);
		e(1200);
		e(1800);
		e(2400);
		e(4800);
		e(9600);
		e(19200);
		e(38400);
		e(57600);
		e(115200);	/* e(230400);e(460800); e(921600);  */
	}

	rio_dprintk(RIO_DEBUG_PARAM, "tx baud 0x%x, rx baud 0x%x\n", TxBaud, RxBaud);


	/*
	 ** Leftovers
	 */
	if (TtyP->termios->c_cflag & CREAD)
		rio_dprintk(RIO_DEBUG_PARAM, "Enable receiver\n");
#ifdef RCV1EN
	if (TtyP->termios->c_cflag & RCV1EN)
		rio_dprintk(RIO_DEBUG_PARAM, "RCV1EN (?)\n");
#endif
#ifdef XMT1EN
	if (TtyP->termios->c_cflag & XMT1EN)
		rio_dprintk(RIO_DEBUG_PARAM, "XMT1EN (?)\n");
#endif
	if (TtyP->termios->c_lflag & ISIG)
		rio_dprintk(RIO_DEBUG_PARAM, "Input character signal generating enabled\n");
	if (TtyP->termios->c_lflag & ICANON)
		rio_dprintk(RIO_DEBUG_PARAM, "Canonical input: erase and kill enabled\n");
	if (TtyP->termios->c_lflag & XCASE)
		rio_dprintk(RIO_DEBUG_PARAM, "Canonical upper/lower presentation\n");
	if (TtyP->termios->c_lflag & ECHO)
		rio_dprintk(RIO_DEBUG_PARAM, "Enable input echo\n");
	if (TtyP->termios->c_lflag & ECHOE)
		rio_dprintk(RIO_DEBUG_PARAM, "Enable echo erase\n");
	if (TtyP->termios->c_lflag & ECHOK)
		rio_dprintk(RIO_DEBUG_PARAM, "Enable echo kill\n");
	if (TtyP->termios->c_lflag & ECHONL)
		rio_dprintk(RIO_DEBUG_PARAM, "Enable echo newline\n");
	if (TtyP->termios->c_lflag & NOFLSH)
		rio_dprintk(RIO_DEBUG_PARAM, "Disable flush after interrupt or quit\n");
#ifdef TOSTOP
	if (TtyP->termios->c_lflag & TOSTOP)
		rio_dprintk(RIO_DEBUG_PARAM, "Send SIGTTOU for background output\n");
#endif
#ifdef XCLUDE
	if (TtyP->termios->c_lflag & XCLUDE)
		rio_dprintk(RIO_DEBUG_PARAM, "Exclusive use of this line\n");
#endif
	if (TtyP->termios->c_iflag & IUCLC)
		rio_dprintk(RIO_DEBUG_PARAM, "Map uppercase to lowercase on input\n");
	if (TtyP->termios->c_oflag & OPOST)
		rio_dprintk(RIO_DEBUG_PARAM, "Enable output post-processing\n");
	if (TtyP->termios->c_oflag & OLCUC)
		rio_dprintk(RIO_DEBUG_PARAM, "Map lowercase to uppercase on output\n");
	if (TtyP->termios->c_oflag & ONOCR)
		rio_dprintk(RIO_DEBUG_PARAM, "No carriage return output at column 0\n");
	if (TtyP->termios->c_oflag & ONLRET)
		rio_dprintk(RIO_DEBUG_PARAM, "Newline performs carriage return function\n");
	if (TtyP->termios->c_oflag & OFILL)
		rio_dprintk(RIO_DEBUG_PARAM, "Use fill characters for delay\n");
	if (TtyP->termios->c_oflag & OFDEL)
		rio_dprintk(RIO_DEBUG_PARAM, "Fill character is DEL\n");
	if (TtyP->termios->c_oflag & NLDLY)
		rio_dprintk(RIO_DEBUG_PARAM, "Newline delay set\n");
	if (TtyP->termios->c_oflag & CRDLY)
		rio_dprintk(RIO_DEBUG_PARAM, "Carriage return delay set\n");
	if (TtyP->termios->c_oflag & TABDLY)
		rio_dprintk(RIO_DEBUG_PARAM, "Tab delay set\n");
	/*
	 ** These things are kind of useful in a later life!
	 */
	PortP->Cor2Copy = Cor2;

	if (PortP->State & RIO_DELETED) {
		rio_spin_unlock_irqrestore(&PortP->portSem, flags);
		func_exit();

		return RIO_FAIL;
	}

	/*
	 ** Actually write the info into the packet to be sent
	 */
	writeb(cmd, &phb_param_ptr->Cmd);
	writeb(Cor1, &phb_param_ptr->Cor1);
	writeb(Cor2, &phb_param_ptr->Cor2);
	writeb(Cor4, &phb_param_ptr->Cor4);
	writeb(Cor5, &phb_param_ptr->Cor5);
	writeb(TxXon, &phb_param_ptr->TxXon);
	writeb(RxXon, &phb_param_ptr->RxXon);
	writeb(TxXoff, &phb_param_ptr->TxXoff);
	writeb(RxXoff, &phb_param_ptr->RxXoff);
	writeb(LNext, &phb_param_ptr->LNext);
	writeb(TxBaud, &phb_param_ptr->TxBaud);
	writeb(RxBaud, &phb_param_ptr->RxBaud);

	/*
	 ** Set the length/command field
	 */
	writeb(12 | PKT_CMD_BIT, &PacketP->len);

	/*
	 ** The packet is formed - now, whack it off
	 ** to its final destination:
	 */
	add_transmit(PortP);
	/*
	 ** Count characters transmitted for port statistics reporting
	 */
	if (PortP->statsGather)
		PortP->txchars += 12;

	rio_spin_unlock_irqrestore(&PortP->portSem, flags);

	rio_dprintk(RIO_DEBUG_PARAM, "add_transmit returned.\n");
	/*
	 ** job done.
	 */
	func_exit();

	return 0;
}


/*
** We can add another packet to a transmit queue if the packet pointer pointed
** to by the TxAdd pointer has PKT_IN_USE clear in its address.
*/
int can_add_transmit(struct PKT __iomem **PktP, struct Port *PortP)
{
	struct PKT __iomem *tp;

	*PktP = tp = (struct PKT __iomem *) RIO_PTR(PortP->Caddr, readw(PortP->TxAdd));

	return !((unsigned long) tp & PKT_IN_USE);
}

/*
** To add a packet to the queue, you set the PKT_IN_USE bit in the address,
** and then move the TxAdd pointer along one position to point to the next
** packet pointer. You must wrap the pointer from the end back to the start.
*/
void add_transmit(struct Port *PortP)
{
	if (readw(PortP->TxAdd) & PKT_IN_USE) {
		rio_dprintk(RIO_DEBUG_PARAM, "add_transmit: Packet has been stolen!");
	}
	writew(readw(PortP->TxAdd) | PKT_IN_USE, PortP->TxAdd);
	PortP->TxAdd = (PortP->TxAdd == PortP->TxEnd) ? PortP->TxStart : PortP->TxAdd + 1;
	writew(RIO_OFF(PortP->Caddr, PortP->TxAdd), &PortP->PhbP->tx_add);
}

/****************************************
 * Put a packet onto the end of the
 * free list
 ****************************************/
void put_free_end(struct Host *HostP, struct PKT __iomem *PktP)
{
	struct rio_free_list __iomem *tmp_pointer;
	unsigned short old_end, new_end;
	unsigned long flags;

	rio_spin_lock_irqsave(&HostP->HostLock, flags);

	 /*************************************************
	* Put a packet back onto the back of the free list
	*
	************************************************/

	rio_dprintk(RIO_DEBUG_PFE, "put_free_end(PktP=%p)\n", PktP);

	if ((old_end = readw(&HostP->ParmMapP->free_list_end)) != TPNULL) {
		new_end = RIO_OFF(HostP->Caddr, PktP);
		tmp_pointer = (struct rio_free_list __iomem *) RIO_PTR(HostP->Caddr, old_end);
		writew(new_end, &tmp_pointer->next);
		writew(old_end, &((struct rio_free_list __iomem *) PktP)->prev);
		writew(TPNULL, &((struct rio_free_list __iomem *) PktP)->next);
		writew(new_end, &HostP->ParmMapP->free_list_end);
	} else {		/* First packet on the free list this should never happen! */
		rio_dprintk(RIO_DEBUG_PFE, "put_free_end(): This should never happen\n");
		writew(RIO_OFF(HostP->Caddr, PktP), &HostP->ParmMapP->free_list_end);
		tmp_pointer = (struct rio_free_list __iomem *) PktP;
		writew(TPNULL, &tmp_pointer->prev);
		writew(TPNULL, &tmp_pointer->next);
	}
	rio_dprintk(RIO_DEBUG_CMD, "Before unlock: %p\n", &HostP->HostLock);
	rio_spin_unlock_irqrestore(&HostP->HostLock, flags);
}

/*
** can_remove_receive(PktP,P) returns non-zero if PKT_IN_USE is set
** for the next packet on the queue. It will also set PktP to point to the
** relevant packet, [having cleared the PKT_IN_USE bit]. If PKT_IN_USE is clear,
** then can_remove_receive() returns 0.
*/
int can_remove_receive(struct PKT __iomem **PktP, struct Port *PortP)
{
	if (readw(PortP->RxRemove) & PKT_IN_USE) {
		*PktP = (struct PKT __iomem *) RIO_PTR(PortP->Caddr, readw(PortP->RxRemove) & ~PKT_IN_USE);
		return 1;
	}
	return 0;
}

/*
** To remove a packet from the receive queue you clear its PKT_IN_USE bit,
** and then bump the pointers. Once the pointers get to the end, they must
** be wrapped back to the start.
*/
void remove_receive(struct Port *PortP)
{
	writew(readw(PortP->RxRemove) & ~PKT_IN_USE, PortP->RxRemove);
	PortP->RxRemove = (PortP->RxRemove == PortP->RxEnd) ? PortP->RxStart : PortP->RxRemove + 1;
	writew(RIO_OFF(PortP->Caddr, PortP->RxRemove), &PortP->PhbP->rx_remove);
}