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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 */
RIOParam(struct Port * PortP,int cmd,int Modem,int SleepFlag)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 */
can_add_transmit(struct PKT __iomem ** PktP,struct Port * PortP)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 */
add_transmit(struct Port * PortP)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  ****************************************/
put_free_end(struct Host * HostP,struct PKT __iomem * PktP)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 */
can_remove_receive(struct PKT __iomem ** PktP,struct Port * PortP)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 */
remove_receive(struct Port * PortP)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 }
665