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1 /*
2 ** -----------------------------------------------------------------------------
3 **
4 **  Perle Specialix driver for Linux
5 **  ported from the existing SCO driver source
6 **
7  *
8  *  (C) 1990 - 2000 Specialix International Ltd., Byfleet, Surrey, UK.
9  *
10  *      This program is free software; you can redistribute it and/or modify
11  *      it under the terms of the GNU General Public License as published by
12  *      the Free Software Foundation; either version 2 of the License, or
13  *      (at your option) any later version.
14  *
15  *      This program is distributed in the hope that it will be useful,
16  *      but WITHOUT ANY WARRANTY; without even the implied warranty of
17  *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  *      GNU General Public License for more details.
19  *
20  *      You should have received a copy of the GNU General Public License
21  *      along with this program; if not, write to the Free Software
22  *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 **
24 **	Module		: riocmd.c
25 **	SID		: 1.2
26 **	Last Modified	: 11/6/98 10:33:41
27 **	Retrieved	: 11/6/98 10:33:49
28 **
29 **  ident @(#)riocmd.c	1.2
30 **
31 ** -----------------------------------------------------------------------------
32 */
33 
34 #include <linux/module.h>
35 #include <linux/slab.h>
36 #include <linux/errno.h>
37 #include <linux/tty.h>
38 #include <asm/io.h>
39 #include <asm/system.h>
40 #include <asm/string.h>
41 #include <asm/uaccess.h>
42 
43 #include <linux/termios.h>
44 #include <linux/serial.h>
45 
46 #include <linux/generic_serial.h>
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 
74 
75 static struct IdentifyRta IdRta;
76 static struct KillNeighbour KillUnit;
77 
RIOFoadRta(struct Host * HostP,struct Map * MapP)78 int RIOFoadRta(struct Host *HostP, struct Map *MapP)
79 {
80 	struct CmdBlk *CmdBlkP;
81 
82 	rio_dprintk(RIO_DEBUG_CMD, "FOAD RTA\n");
83 
84 	CmdBlkP = RIOGetCmdBlk();
85 
86 	if (!CmdBlkP) {
87 		rio_dprintk(RIO_DEBUG_CMD, "FOAD RTA: GetCmdBlk failed\n");
88 		return -ENXIO;
89 	}
90 
91 	CmdBlkP->Packet.dest_unit = MapP->ID;
92 	CmdBlkP->Packet.dest_port = BOOT_RUP;
93 	CmdBlkP->Packet.src_unit = 0;
94 	CmdBlkP->Packet.src_port = BOOT_RUP;
95 	CmdBlkP->Packet.len = 0x84;
96 	CmdBlkP->Packet.data[0] = IFOAD;
97 	CmdBlkP->Packet.data[1] = 0;
98 	CmdBlkP->Packet.data[2] = IFOAD_MAGIC & 0xFF;
99 	CmdBlkP->Packet.data[3] = (IFOAD_MAGIC >> 8) & 0xFF;
100 
101 	if (RIOQueueCmdBlk(HostP, MapP->ID - 1, CmdBlkP) == RIO_FAIL) {
102 		rio_dprintk(RIO_DEBUG_CMD, "FOAD RTA: Failed to queue foad command\n");
103 		return -EIO;
104 	}
105 	return 0;
106 }
107 
RIOZombieRta(struct Host * HostP,struct Map * MapP)108 int RIOZombieRta(struct Host *HostP, struct Map *MapP)
109 {
110 	struct CmdBlk *CmdBlkP;
111 
112 	rio_dprintk(RIO_DEBUG_CMD, "ZOMBIE RTA\n");
113 
114 	CmdBlkP = RIOGetCmdBlk();
115 
116 	if (!CmdBlkP) {
117 		rio_dprintk(RIO_DEBUG_CMD, "ZOMBIE RTA: GetCmdBlk failed\n");
118 		return -ENXIO;
119 	}
120 
121 	CmdBlkP->Packet.dest_unit = MapP->ID;
122 	CmdBlkP->Packet.dest_port = BOOT_RUP;
123 	CmdBlkP->Packet.src_unit = 0;
124 	CmdBlkP->Packet.src_port = BOOT_RUP;
125 	CmdBlkP->Packet.len = 0x84;
126 	CmdBlkP->Packet.data[0] = ZOMBIE;
127 	CmdBlkP->Packet.data[1] = 0;
128 	CmdBlkP->Packet.data[2] = ZOMBIE_MAGIC & 0xFF;
129 	CmdBlkP->Packet.data[3] = (ZOMBIE_MAGIC >> 8) & 0xFF;
130 
131 	if (RIOQueueCmdBlk(HostP, MapP->ID - 1, CmdBlkP) == RIO_FAIL) {
132 		rio_dprintk(RIO_DEBUG_CMD, "ZOMBIE RTA: Failed to queue zombie command\n");
133 		return -EIO;
134 	}
135 	return 0;
136 }
137 
RIOCommandRta(struct rio_info * p,unsigned long RtaUnique,int (* func)(struct Host * HostP,struct Map * MapP))138 int RIOCommandRta(struct rio_info *p, unsigned long RtaUnique, int (*func) (struct Host * HostP, struct Map * MapP))
139 {
140 	unsigned int Host;
141 
142 	rio_dprintk(RIO_DEBUG_CMD, "Command RTA 0x%lx func %p\n", RtaUnique, func);
143 
144 	if (!RtaUnique)
145 		return (0);
146 
147 	for (Host = 0; Host < p->RIONumHosts; Host++) {
148 		unsigned int Rta;
149 		struct Host *HostP = &p->RIOHosts[Host];
150 
151 		for (Rta = 0; Rta < RTAS_PER_HOST; Rta++) {
152 			struct Map *MapP = &HostP->Mapping[Rta];
153 
154 			if (MapP->RtaUniqueNum == RtaUnique) {
155 				uint Link;
156 
157 				/*
158 				 ** now, lets just check we have a route to it...
159 				 ** IF the routing stuff is working, then one of the
160 				 ** topology entries for this unit will have a legit
161 				 ** route *somewhere*. We care not where - if its got
162 				 ** any connections, we can get to it.
163 				 */
164 				for (Link = 0; Link < LINKS_PER_UNIT; Link++) {
165 					if (MapP->Topology[Link].Unit <= (u8) MAX_RUP) {
166 						/*
167 						 ** Its worth trying the operation...
168 						 */
169 						return (*func) (HostP, MapP);
170 					}
171 				}
172 			}
173 		}
174 	}
175 	return -ENXIO;
176 }
177 
178 
RIOIdentifyRta(struct rio_info * p,void __user * arg)179 int RIOIdentifyRta(struct rio_info *p, void __user * arg)
180 {
181 	unsigned int Host;
182 
183 	if (copy_from_user(&IdRta, arg, sizeof(IdRta))) {
184 		rio_dprintk(RIO_DEBUG_CMD, "RIO_IDENTIFY_RTA copy failed\n");
185 		p->RIOError.Error = COPYIN_FAILED;
186 		return -EFAULT;
187 	}
188 
189 	for (Host = 0; Host < p->RIONumHosts; Host++) {
190 		unsigned int Rta;
191 		struct Host *HostP = &p->RIOHosts[Host];
192 
193 		for (Rta = 0; Rta < RTAS_PER_HOST; Rta++) {
194 			struct Map *MapP = &HostP->Mapping[Rta];
195 
196 			if (MapP->RtaUniqueNum == IdRta.RtaUnique) {
197 				uint Link;
198 				/*
199 				 ** now, lets just check we have a route to it...
200 				 ** IF the routing stuff is working, then one of the
201 				 ** topology entries for this unit will have a legit
202 				 ** route *somewhere*. We care not where - if its got
203 				 ** any connections, we can get to it.
204 				 */
205 				for (Link = 0; Link < LINKS_PER_UNIT; Link++) {
206 					if (MapP->Topology[Link].Unit <= (u8) MAX_RUP) {
207 						/*
208 						 ** Its worth trying the operation...
209 						 */
210 						struct CmdBlk *CmdBlkP;
211 
212 						rio_dprintk(RIO_DEBUG_CMD, "IDENTIFY RTA\n");
213 
214 						CmdBlkP = RIOGetCmdBlk();
215 
216 						if (!CmdBlkP) {
217 							rio_dprintk(RIO_DEBUG_CMD, "IDENTIFY RTA: GetCmdBlk failed\n");
218 							return -ENXIO;
219 						}
220 
221 						CmdBlkP->Packet.dest_unit = MapP->ID;
222 						CmdBlkP->Packet.dest_port = BOOT_RUP;
223 						CmdBlkP->Packet.src_unit = 0;
224 						CmdBlkP->Packet.src_port = BOOT_RUP;
225 						CmdBlkP->Packet.len = 0x84;
226 						CmdBlkP->Packet.data[0] = IDENTIFY;
227 						CmdBlkP->Packet.data[1] = 0;
228 						CmdBlkP->Packet.data[2] = IdRta.ID;
229 
230 						if (RIOQueueCmdBlk(HostP, MapP->ID - 1, CmdBlkP) == RIO_FAIL) {
231 							rio_dprintk(RIO_DEBUG_CMD, "IDENTIFY RTA: Failed to queue command\n");
232 							return -EIO;
233 						}
234 						return 0;
235 					}
236 				}
237 			}
238 		}
239 	}
240 	return -ENOENT;
241 }
242 
243 
RIOKillNeighbour(struct rio_info * p,void __user * arg)244 int RIOKillNeighbour(struct rio_info *p, void __user * arg)
245 {
246 	uint Host;
247 	uint ID;
248 	struct Host *HostP;
249 	struct CmdBlk *CmdBlkP;
250 
251 	rio_dprintk(RIO_DEBUG_CMD, "KILL HOST NEIGHBOUR\n");
252 
253 	if (copy_from_user(&KillUnit, arg, sizeof(KillUnit))) {
254 		rio_dprintk(RIO_DEBUG_CMD, "RIO_KILL_NEIGHBOUR copy failed\n");
255 		p->RIOError.Error = COPYIN_FAILED;
256 		return -EFAULT;
257 	}
258 
259 	if (KillUnit.Link > 3)
260 		return -ENXIO;
261 
262 	CmdBlkP = RIOGetCmdBlk();
263 
264 	if (!CmdBlkP) {
265 		rio_dprintk(RIO_DEBUG_CMD, "UFOAD: GetCmdBlk failed\n");
266 		return -ENXIO;
267 	}
268 
269 	CmdBlkP->Packet.dest_unit = 0;
270 	CmdBlkP->Packet.src_unit = 0;
271 	CmdBlkP->Packet.dest_port = BOOT_RUP;
272 	CmdBlkP->Packet.src_port = BOOT_RUP;
273 	CmdBlkP->Packet.len = 0x84;
274 	CmdBlkP->Packet.data[0] = UFOAD;
275 	CmdBlkP->Packet.data[1] = KillUnit.Link;
276 	CmdBlkP->Packet.data[2] = UFOAD_MAGIC & 0xFF;
277 	CmdBlkP->Packet.data[3] = (UFOAD_MAGIC >> 8) & 0xFF;
278 
279 	for (Host = 0; Host < p->RIONumHosts; Host++) {
280 		ID = 0;
281 		HostP = &p->RIOHosts[Host];
282 
283 		if (HostP->UniqueNum == KillUnit.UniqueNum) {
284 			if (RIOQueueCmdBlk(HostP, RTAS_PER_HOST + KillUnit.Link, CmdBlkP) == RIO_FAIL) {
285 				rio_dprintk(RIO_DEBUG_CMD, "UFOAD: Failed queue command\n");
286 				return -EIO;
287 			}
288 			return 0;
289 		}
290 
291 		for (ID = 0; ID < RTAS_PER_HOST; ID++) {
292 			if (HostP->Mapping[ID].RtaUniqueNum == KillUnit.UniqueNum) {
293 				CmdBlkP->Packet.dest_unit = ID + 1;
294 				if (RIOQueueCmdBlk(HostP, ID, CmdBlkP) == RIO_FAIL) {
295 					rio_dprintk(RIO_DEBUG_CMD, "UFOAD: Failed queue command\n");
296 					return -EIO;
297 				}
298 				return 0;
299 			}
300 		}
301 	}
302 	RIOFreeCmdBlk(CmdBlkP);
303 	return -ENXIO;
304 }
305 
RIOSuspendBootRta(struct Host * HostP,int ID,int Link)306 int RIOSuspendBootRta(struct Host *HostP, int ID, int Link)
307 {
308 	struct CmdBlk *CmdBlkP;
309 
310 	rio_dprintk(RIO_DEBUG_CMD, "SUSPEND BOOT ON RTA ID %d, link %c\n", ID, 'A' + Link);
311 
312 	CmdBlkP = RIOGetCmdBlk();
313 
314 	if (!CmdBlkP) {
315 		rio_dprintk(RIO_DEBUG_CMD, "SUSPEND BOOT ON RTA: GetCmdBlk failed\n");
316 		return -ENXIO;
317 	}
318 
319 	CmdBlkP->Packet.dest_unit = ID;
320 	CmdBlkP->Packet.dest_port = BOOT_RUP;
321 	CmdBlkP->Packet.src_unit = 0;
322 	CmdBlkP->Packet.src_port = BOOT_RUP;
323 	CmdBlkP->Packet.len = 0x84;
324 	CmdBlkP->Packet.data[0] = IWAIT;
325 	CmdBlkP->Packet.data[1] = Link;
326 	CmdBlkP->Packet.data[2] = IWAIT_MAGIC & 0xFF;
327 	CmdBlkP->Packet.data[3] = (IWAIT_MAGIC >> 8) & 0xFF;
328 
329 	if (RIOQueueCmdBlk(HostP, ID - 1, CmdBlkP) == RIO_FAIL) {
330 		rio_dprintk(RIO_DEBUG_CMD, "SUSPEND BOOT ON RTA: Failed to queue iwait command\n");
331 		return -EIO;
332 	}
333 	return 0;
334 }
335 
RIOFoadWakeup(struct rio_info * p)336 int RIOFoadWakeup(struct rio_info *p)
337 {
338 	int port;
339 	struct Port *PortP;
340 	unsigned long flags;
341 
342 	for (port = 0; port < RIO_PORTS; port++) {
343 		PortP = p->RIOPortp[port];
344 
345 		rio_spin_lock_irqsave(&PortP->portSem, flags);
346 		PortP->Config = 0;
347 		PortP->State = 0;
348 		PortP->InUse = NOT_INUSE;
349 		PortP->PortState = 0;
350 		PortP->FlushCmdBodge = 0;
351 		PortP->ModemLines = 0;
352 		PortP->ModemState = 0;
353 		PortP->CookMode = 0;
354 		PortP->ParamSem = 0;
355 		PortP->Mapped = 0;
356 		PortP->WflushFlag = 0;
357 		PortP->MagicFlags = 0;
358 		PortP->RxDataStart = 0;
359 		PortP->TxBufferIn = 0;
360 		PortP->TxBufferOut = 0;
361 		rio_spin_unlock_irqrestore(&PortP->portSem, flags);
362 	}
363 	return (0);
364 }
365 
366 /*
367 ** Incoming command on the COMMAND_RUP to be processed.
368 */
RIOCommandRup(struct rio_info * p,uint Rup,struct Host * HostP,struct PKT __iomem * PacketP)369 static int RIOCommandRup(struct rio_info *p, uint Rup, struct Host *HostP, struct PKT __iomem *PacketP)
370 {
371 	struct PktCmd __iomem *PktCmdP = (struct PktCmd __iomem *)PacketP->data;
372 	struct Port *PortP;
373 	struct UnixRup *UnixRupP;
374 	unsigned short SysPort;
375 	unsigned short ReportedModemStatus;
376 	unsigned short rup;
377 	unsigned short subCommand;
378 	unsigned long flags;
379 
380 	func_enter();
381 
382 	/*
383 	 ** 16 port RTA note:
384 	 ** Command rup packets coming from the RTA will have pkt->data[1] (which
385 	 ** translates to PktCmdP->PhbNum) set to the host port number for the
386 	 ** particular unit. To access the correct BaseSysPort for a 16 port RTA,
387 	 ** we can use PhbNum to get the rup number for the appropriate 8 port
388 	 ** block (for the first block, this should be equal to 'Rup').
389 	 */
390 	rup = readb(&PktCmdP->PhbNum) / (unsigned short) PORTS_PER_RTA;
391 	UnixRupP = &HostP->UnixRups[rup];
392 	SysPort = UnixRupP->BaseSysPort + (readb(&PktCmdP->PhbNum) % (unsigned short) PORTS_PER_RTA);
393 	rio_dprintk(RIO_DEBUG_CMD, "Command on rup %d, port %d\n", rup, SysPort);
394 
395 	if (UnixRupP->BaseSysPort == NO_PORT) {
396 		rio_dprintk(RIO_DEBUG_CMD, "OBSCURE ERROR!\n");
397 		rio_dprintk(RIO_DEBUG_CMD, "Diagnostics follow. Please WRITE THESE DOWN and report them to Specialix Technical Support\n");
398 		rio_dprintk(RIO_DEBUG_CMD, "CONTROL information: Host number %Zd, name ``%s''\n", HostP - p->RIOHosts, HostP->Name);
399 		rio_dprintk(RIO_DEBUG_CMD, "CONTROL information: Rup number  0x%x\n", rup);
400 
401 		if (Rup < (unsigned short) MAX_RUP) {
402 			rio_dprintk(RIO_DEBUG_CMD, "CONTROL information: This is the RUP for RTA ``%s''\n", HostP->Mapping[Rup].Name);
403 		} else
404 			rio_dprintk(RIO_DEBUG_CMD, "CONTROL information: This is the RUP for link ``%c'' of host ``%s''\n", ('A' + Rup - MAX_RUP), HostP->Name);
405 
406 		rio_dprintk(RIO_DEBUG_CMD, "PACKET information: Destination 0x%x:0x%x\n", readb(&PacketP->dest_unit), readb(&PacketP->dest_port));
407 		rio_dprintk(RIO_DEBUG_CMD, "PACKET information: Source	  0x%x:0x%x\n", readb(&PacketP->src_unit), readb(&PacketP->src_port));
408 		rio_dprintk(RIO_DEBUG_CMD, "PACKET information: Length	  0x%x (%d)\n", readb(&PacketP->len), readb(&PacketP->len));
409 		rio_dprintk(RIO_DEBUG_CMD, "PACKET information: Control	 0x%x (%d)\n", readb(&PacketP->control), readb(&PacketP->control));
410 		rio_dprintk(RIO_DEBUG_CMD, "PACKET information: Check	   0x%x (%d)\n", readw(&PacketP->csum), readw(&PacketP->csum));
411 		rio_dprintk(RIO_DEBUG_CMD, "COMMAND information: Host Port Number 0x%x, " "Command Code 0x%x\n", readb(&PktCmdP->PhbNum), readb(&PktCmdP->Command));
412 		return 1;
413 	}
414 	PortP = p->RIOPortp[SysPort];
415 	rio_spin_lock_irqsave(&PortP->portSem, flags);
416 	switch (readb(&PktCmdP->Command)) {
417 	case RIOC_BREAK_RECEIVED:
418 		rio_dprintk(RIO_DEBUG_CMD, "Received a break!\n");
419 		/* If the current line disc. is not multi-threading and
420 		   the current processor is not the default, reset rup_intr
421 		   and return 0 to ensure that the command packet is
422 		   not freed. */
423 		/* Call tmgr HANGUP HERE */
424 		/* Fix this later when every thing works !!!! RAMRAJ */
425 		gs_got_break(&PortP->gs);
426 		break;
427 
428 	case RIOC_COMPLETE:
429 		rio_dprintk(RIO_DEBUG_CMD, "Command complete on phb %d host %Zd\n", readb(&PktCmdP->PhbNum), HostP - p->RIOHosts);
430 		subCommand = 1;
431 		switch (readb(&PktCmdP->SubCommand)) {
432 		case RIOC_MEMDUMP:
433 			rio_dprintk(RIO_DEBUG_CMD, "Memory dump cmd (0x%x) from addr 0x%x\n", readb(&PktCmdP->SubCommand), readw(&PktCmdP->SubAddr));
434 			break;
435 		case RIOC_READ_REGISTER:
436 			rio_dprintk(RIO_DEBUG_CMD, "Read register (0x%x)\n", readw(&PktCmdP->SubAddr));
437 			p->CdRegister = (readb(&PktCmdP->ModemStatus) & RIOC_MSVR1_HOST);
438 			break;
439 		default:
440 			subCommand = 0;
441 			break;
442 		}
443 		if (subCommand)
444 			break;
445 		rio_dprintk(RIO_DEBUG_CMD, "New status is 0x%x was 0x%x\n", readb(&PktCmdP->PortStatus), PortP->PortState);
446 		if (PortP->PortState != readb(&PktCmdP->PortStatus)) {
447 			rio_dprintk(RIO_DEBUG_CMD, "Mark status & wakeup\n");
448 			PortP->PortState = readb(&PktCmdP->PortStatus);
449 			/* What should we do here ...
450 			   wakeup( &PortP->PortState );
451 			 */
452 		} else
453 			rio_dprintk(RIO_DEBUG_CMD, "No change\n");
454 
455 		/* FALLTHROUGH */
456 	case RIOC_MODEM_STATUS:
457 		/*
458 		 ** Knock out the tbusy and tstop bits, as these are not relevant
459 		 ** to the check for modem status change (they're just there because
460 		 ** it's a convenient place to put them!).
461 		 */
462 		ReportedModemStatus = readb(&PktCmdP->ModemStatus);
463 		if ((PortP->ModemState & RIOC_MSVR1_HOST) ==
464 				(ReportedModemStatus & RIOC_MSVR1_HOST)) {
465 			rio_dprintk(RIO_DEBUG_CMD, "Modem status unchanged 0x%x\n", PortP->ModemState);
466 			/*
467 			 ** Update ModemState just in case tbusy or tstop states have
468 			 ** changed.
469 			 */
470 			PortP->ModemState = ReportedModemStatus;
471 		} else {
472 			rio_dprintk(RIO_DEBUG_CMD, "Modem status change from 0x%x to 0x%x\n", PortP->ModemState, ReportedModemStatus);
473 			PortP->ModemState = ReportedModemStatus;
474 #ifdef MODEM_SUPPORT
475 			if (PortP->Mapped) {
476 				/***********************************************************\
477 				*************************************************************
478 				***													   ***
479 				***		  M O D E M   S T A T E   C H A N G E		  ***
480 				***													   ***
481 				*************************************************************
482 				\***********************************************************/
483 				/*
484 				 ** If the device is a modem, then check the modem
485 				 ** carrier.
486 				 */
487 				if (PortP->gs.port.tty == NULL)
488 					break;
489 				if (PortP->gs.port.tty->termios == NULL)
490 					break;
491 
492 				if (!(PortP->gs.port.tty->termios->c_cflag & CLOCAL) && ((PortP->State & (RIO_MOPEN | RIO_WOPEN)))) {
493 
494 					rio_dprintk(RIO_DEBUG_CMD, "Is there a Carrier?\n");
495 					/*
496 					 ** Is there a carrier?
497 					 */
498 					if (PortP->ModemState & RIOC_MSVR1_CD) {
499 						/*
500 						 ** Has carrier just appeared?
501 						 */
502 						if (!(PortP->State & RIO_CARR_ON)) {
503 							rio_dprintk(RIO_DEBUG_CMD, "Carrier just came up.\n");
504 							PortP->State |= RIO_CARR_ON;
505 							/*
506 							 ** wakeup anyone in WOPEN
507 							 */
508 							if (PortP->State & (PORT_ISOPEN | RIO_WOPEN))
509 								wake_up_interruptible(&PortP->gs.port.open_wait);
510 						}
511 					} else {
512 						/*
513 						 ** Has carrier just dropped?
514 						 */
515 						if (PortP->State & RIO_CARR_ON) {
516 							if (PortP->State & (PORT_ISOPEN | RIO_WOPEN | RIO_MOPEN))
517 								tty_hangup(PortP->gs.port.tty);
518 							PortP->State &= ~RIO_CARR_ON;
519 							rio_dprintk(RIO_DEBUG_CMD, "Carrirer just went down\n");
520 						}
521 					}
522 				}
523 			}
524 #endif
525 		}
526 		break;
527 
528 	default:
529 		rio_dprintk(RIO_DEBUG_CMD, "Unknown command %d on CMD_RUP of host %Zd\n", readb(&PktCmdP->Command), HostP - p->RIOHosts);
530 		break;
531 	}
532 	rio_spin_unlock_irqrestore(&PortP->portSem, flags);
533 
534 	func_exit();
535 
536 	return 1;
537 }
538 
539 /*
540 ** The command mechanism:
541 **	Each rup has a chain of commands associated with it.
542 **	This chain is maintained by routines in this file.
543 **	Periodically we are called and we run a quick check of all the
544 **	active chains to determine if there is a command to be executed,
545 **	and if the rup is ready to accept it.
546 **
547 */
548 
549 /*
550 ** Allocate an empty command block.
551 */
RIOGetCmdBlk(void)552 struct CmdBlk *RIOGetCmdBlk(void)
553 {
554 	struct CmdBlk *CmdBlkP;
555 
556 	CmdBlkP = kzalloc(sizeof(struct CmdBlk), GFP_ATOMIC);
557 	return CmdBlkP;
558 }
559 
560 /*
561 ** Return a block to the head of the free list.
562 */
RIOFreeCmdBlk(struct CmdBlk * CmdBlkP)563 void RIOFreeCmdBlk(struct CmdBlk *CmdBlkP)
564 {
565 	kfree(CmdBlkP);
566 }
567 
568 /*
569 ** attach a command block to the list of commands to be performed for
570 ** a given rup.
571 */
RIOQueueCmdBlk(struct Host * HostP,uint Rup,struct CmdBlk * CmdBlkP)572 int RIOQueueCmdBlk(struct Host *HostP, uint Rup, struct CmdBlk *CmdBlkP)
573 {
574 	struct CmdBlk **Base;
575 	struct UnixRup *UnixRupP;
576 	unsigned long flags;
577 
578 	if (Rup >= (unsigned short) (MAX_RUP + LINKS_PER_UNIT)) {
579 		rio_dprintk(RIO_DEBUG_CMD, "Illegal rup number %d in RIOQueueCmdBlk\n", Rup);
580 		RIOFreeCmdBlk(CmdBlkP);
581 		return RIO_FAIL;
582 	}
583 
584 	UnixRupP = &HostP->UnixRups[Rup];
585 
586 	rio_spin_lock_irqsave(&UnixRupP->RupLock, flags);
587 
588 	/*
589 	 ** If the RUP is currently inactive, then put the request
590 	 ** straight on the RUP....
591 	 */
592 	if ((UnixRupP->CmdsWaitingP == NULL) && (UnixRupP->CmdPendingP == NULL) && (readw(&UnixRupP->RupP->txcontrol) == TX_RUP_INACTIVE) && (CmdBlkP->PreFuncP ? (*CmdBlkP->PreFuncP) (CmdBlkP->PreArg, CmdBlkP)
593 																	     : 1)) {
594 		rio_dprintk(RIO_DEBUG_CMD, "RUP inactive-placing command straight on. Cmd byte is 0x%x\n", CmdBlkP->Packet.data[0]);
595 
596 		/*
597 		 ** Whammy! blat that pack!
598 		 */
599 		HostP->Copy(&CmdBlkP->Packet, RIO_PTR(HostP->Caddr, readw(&UnixRupP->RupP->txpkt)), sizeof(struct PKT));
600 
601 		/*
602 		 ** place command packet on the pending position.
603 		 */
604 		UnixRupP->CmdPendingP = CmdBlkP;
605 
606 		/*
607 		 ** set the command register
608 		 */
609 		writew(TX_PACKET_READY, &UnixRupP->RupP->txcontrol);
610 
611 		rio_spin_unlock_irqrestore(&UnixRupP->RupLock, flags);
612 
613 		return 0;
614 	}
615 	rio_dprintk(RIO_DEBUG_CMD, "RUP active - en-queing\n");
616 
617 	if (UnixRupP->CmdsWaitingP != NULL)
618 		rio_dprintk(RIO_DEBUG_CMD, "Rup active - command waiting\n");
619 	if (UnixRupP->CmdPendingP != NULL)
620 		rio_dprintk(RIO_DEBUG_CMD, "Rup active - command pending\n");
621 	if (readw(&UnixRupP->RupP->txcontrol) != TX_RUP_INACTIVE)
622 		rio_dprintk(RIO_DEBUG_CMD, "Rup active - command rup not ready\n");
623 
624 	Base = &UnixRupP->CmdsWaitingP;
625 
626 	rio_dprintk(RIO_DEBUG_CMD, "First try to queue cmdblk %p at %p\n", CmdBlkP, Base);
627 
628 	while (*Base) {
629 		rio_dprintk(RIO_DEBUG_CMD, "Command cmdblk %p here\n", *Base);
630 		Base = &((*Base)->NextP);
631 		rio_dprintk(RIO_DEBUG_CMD, "Now try to queue cmd cmdblk %p at %p\n", CmdBlkP, Base);
632 	}
633 
634 	rio_dprintk(RIO_DEBUG_CMD, "Will queue cmdblk %p at %p\n", CmdBlkP, Base);
635 
636 	*Base = CmdBlkP;
637 
638 	CmdBlkP->NextP = NULL;
639 
640 	rio_spin_unlock_irqrestore(&UnixRupP->RupLock, flags);
641 
642 	return 0;
643 }
644 
645 /*
646 ** Here we go - if there is an empty rup, fill it!
647 ** must be called at splrio() or higher.
648 */
RIOPollHostCommands(struct rio_info * p,struct Host * HostP)649 void RIOPollHostCommands(struct rio_info *p, struct Host *HostP)
650 {
651 	struct CmdBlk *CmdBlkP;
652 	struct UnixRup *UnixRupP;
653 	struct PKT __iomem *PacketP;
654 	unsigned short Rup;
655 	unsigned long flags;
656 
657 
658 	Rup = MAX_RUP + LINKS_PER_UNIT;
659 
660 	do {			/* do this loop for each RUP */
661 		/*
662 		 ** locate the rup we are processing & lock it
663 		 */
664 		UnixRupP = &HostP->UnixRups[--Rup];
665 
666 		spin_lock_irqsave(&UnixRupP->RupLock, flags);
667 
668 		/*
669 		 ** First check for incoming commands:
670 		 */
671 		if (readw(&UnixRupP->RupP->rxcontrol) != RX_RUP_INACTIVE) {
672 			int FreeMe;
673 
674 			PacketP = (struct PKT __iomem *) RIO_PTR(HostP->Caddr, readw(&UnixRupP->RupP->rxpkt));
675 
676 			switch (readb(&PacketP->dest_port)) {
677 			case BOOT_RUP:
678 				rio_dprintk(RIO_DEBUG_CMD, "Incoming Boot %s packet '%x'\n", readb(&PacketP->len) & 0x80 ? "Command" : "Data", readb(&PacketP->data[0]));
679 				rio_spin_unlock_irqrestore(&UnixRupP->RupLock, flags);
680 				FreeMe = RIOBootRup(p, Rup, HostP, PacketP);
681 				rio_spin_lock_irqsave(&UnixRupP->RupLock, flags);
682 				break;
683 
684 			case COMMAND_RUP:
685 				/*
686 				 ** Free the RUP lock as loss of carrier causes a
687 				 ** ttyflush which will (eventually) call another
688 				 ** routine that uses the RUP lock.
689 				 */
690 				rio_spin_unlock_irqrestore(&UnixRupP->RupLock, flags);
691 				FreeMe = RIOCommandRup(p, Rup, HostP, PacketP);
692 				if (readb(&PacketP->data[5]) == RIOC_MEMDUMP) {
693 					rio_dprintk(RIO_DEBUG_CMD, "Memdump from 0x%x complete\n", readw(&(PacketP->data[6])));
694 					rio_memcpy_fromio(p->RIOMemDump, &(PacketP->data[8]), 32);
695 				}
696 				rio_spin_lock_irqsave(&UnixRupP->RupLock, flags);
697 				break;
698 
699 			case ROUTE_RUP:
700 				rio_spin_unlock_irqrestore(&UnixRupP->RupLock, flags);
701 				FreeMe = RIORouteRup(p, Rup, HostP, PacketP);
702 				rio_spin_lock_irqsave(&UnixRupP->RupLock, flags);
703 				break;
704 
705 			default:
706 				rio_dprintk(RIO_DEBUG_CMD, "Unknown RUP %d\n", readb(&PacketP->dest_port));
707 				FreeMe = 1;
708 				break;
709 			}
710 
711 			if (FreeMe) {
712 				rio_dprintk(RIO_DEBUG_CMD, "Free processed incoming command packet\n");
713 				put_free_end(HostP, PacketP);
714 
715 				writew(RX_RUP_INACTIVE, &UnixRupP->RupP->rxcontrol);
716 
717 				if (readw(&UnixRupP->RupP->handshake) == PHB_HANDSHAKE_SET) {
718 					rio_dprintk(RIO_DEBUG_CMD, "Handshake rup %d\n", Rup);
719 					writew(PHB_HANDSHAKE_SET | PHB_HANDSHAKE_RESET, &UnixRupP->RupP->handshake);
720 				}
721 			}
722 		}
723 
724 		/*
725 		 ** IF a command was running on the port,
726 		 ** and it has completed, then tidy it up.
727 		 */
728 		if ((CmdBlkP = UnixRupP->CmdPendingP) &&	/* ASSIGN! */
729 		    (readw(&UnixRupP->RupP->txcontrol) == TX_RUP_INACTIVE)) {
730 			/*
731 			 ** we are idle.
732 			 ** there is a command in pending.
733 			 ** Therefore, this command has finished.
734 			 ** So, wakeup whoever is waiting for it (and tell them
735 			 ** what happened).
736 			 */
737 			if (CmdBlkP->Packet.dest_port == BOOT_RUP)
738 				rio_dprintk(RIO_DEBUG_CMD, "Free Boot %s Command Block '%x'\n", CmdBlkP->Packet.len & 0x80 ? "Command" : "Data", CmdBlkP->Packet.data[0]);
739 
740 			rio_dprintk(RIO_DEBUG_CMD, "Command %p completed\n", CmdBlkP);
741 
742 			/*
743 			 ** Clear the Rup lock to prevent mutual exclusion.
744 			 */
745 			if (CmdBlkP->PostFuncP) {
746 				rio_spin_unlock_irqrestore(&UnixRupP->RupLock, flags);
747 				(*CmdBlkP->PostFuncP) (CmdBlkP->PostArg, CmdBlkP);
748 				rio_spin_lock_irqsave(&UnixRupP->RupLock, flags);
749 			}
750 
751 			/*
752 			 ** ....clear the pending flag....
753 			 */
754 			UnixRupP->CmdPendingP = NULL;
755 
756 			/*
757 			 ** ....and return the command block to the freelist.
758 			 */
759 			RIOFreeCmdBlk(CmdBlkP);
760 		}
761 
762 		/*
763 		 ** If there is a command for this rup, and the rup
764 		 ** is idle, then process the command
765 		 */
766 		if ((CmdBlkP = UnixRupP->CmdsWaitingP) &&	/* ASSIGN! */
767 		    (UnixRupP->CmdPendingP == NULL) && (readw(&UnixRupP->RupP->txcontrol) == TX_RUP_INACTIVE)) {
768 			/*
769 			 ** if the pre-function is non-zero, call it.
770 			 ** If it returns RIO_FAIL then don't
771 			 ** send this command yet!
772 			 */
773 			if (!(CmdBlkP->PreFuncP ? (*CmdBlkP->PreFuncP) (CmdBlkP->PreArg, CmdBlkP) : 1)) {
774 				rio_dprintk(RIO_DEBUG_CMD, "Not ready to start command %p\n", CmdBlkP);
775 			} else {
776 				rio_dprintk(RIO_DEBUG_CMD, "Start new command %p Cmd byte is 0x%x\n", CmdBlkP, CmdBlkP->Packet.data[0]);
777 				/*
778 				 ** Whammy! blat that pack!
779 				 */
780 				HostP->Copy(&CmdBlkP->Packet, RIO_PTR(HostP->Caddr, readw(&UnixRupP->RupP->txpkt)), sizeof(struct PKT));
781 
782 				/*
783 				 ** remove the command from the rup command queue...
784 				 */
785 				UnixRupP->CmdsWaitingP = CmdBlkP->NextP;
786 
787 				/*
788 				 ** ...and place it on the pending position.
789 				 */
790 				UnixRupP->CmdPendingP = CmdBlkP;
791 
792 				/*
793 				 ** set the command register
794 				 */
795 				writew(TX_PACKET_READY, &UnixRupP->RupP->txcontrol);
796 
797 				/*
798 				 ** the command block will be freed
799 				 ** when the command has been processed.
800 				 */
801 			}
802 		}
803 		spin_unlock_irqrestore(&UnixRupP->RupLock, flags);
804 	} while (Rup);
805 }
806 
RIOWFlushMark(unsigned long iPortP,struct CmdBlk * CmdBlkP)807 int RIOWFlushMark(unsigned long iPortP, struct CmdBlk *CmdBlkP)
808 {
809 	struct Port *PortP = (struct Port *) iPortP;
810 	unsigned long flags;
811 
812 	rio_spin_lock_irqsave(&PortP->portSem, flags);
813 	PortP->WflushFlag++;
814 	PortP->MagicFlags |= MAGIC_FLUSH;
815 	rio_spin_unlock_irqrestore(&PortP->portSem, flags);
816 	return RIOUnUse(iPortP, CmdBlkP);
817 }
818 
RIORFlushEnable(unsigned long iPortP,struct CmdBlk * CmdBlkP)819 int RIORFlushEnable(unsigned long iPortP, struct CmdBlk *CmdBlkP)
820 {
821 	struct Port *PortP = (struct Port *) iPortP;
822 	struct PKT __iomem *PacketP;
823 	unsigned long flags;
824 
825 	rio_spin_lock_irqsave(&PortP->portSem, flags);
826 
827 	while (can_remove_receive(&PacketP, PortP)) {
828 		remove_receive(PortP);
829 		put_free_end(PortP->HostP, PacketP);
830 	}
831 
832 	if (readw(&PortP->PhbP->handshake) == PHB_HANDSHAKE_SET) {
833 		/*
834 		 ** MAGIC! (Basically, handshake the RX buffer, so that
835 		 ** the RTAs upstream can be re-enabled.)
836 		 */
837 		rio_dprintk(RIO_DEBUG_CMD, "Util: Set RX handshake bit\n");
838 		writew(PHB_HANDSHAKE_SET | PHB_HANDSHAKE_RESET, &PortP->PhbP->handshake);
839 	}
840 	rio_spin_unlock_irqrestore(&PortP->portSem, flags);
841 	return RIOUnUse(iPortP, CmdBlkP);
842 }
843 
RIOUnUse(unsigned long iPortP,struct CmdBlk * CmdBlkP)844 int RIOUnUse(unsigned long iPortP, struct CmdBlk *CmdBlkP)
845 {
846 	struct Port *PortP = (struct Port *) iPortP;
847 	unsigned long flags;
848 
849 	rio_spin_lock_irqsave(&PortP->portSem, flags);
850 
851 	rio_dprintk(RIO_DEBUG_CMD, "Decrement in use count for port\n");
852 
853 	if (PortP->InUse) {
854 		if (--PortP->InUse != NOT_INUSE) {
855 			rio_spin_unlock_irqrestore(&PortP->portSem, flags);
856 			return 0;
857 		}
858 	}
859 	/*
860 	 ** While PortP->InUse is set (i.e. a preemptive command has been sent to
861 	 ** the RTA and is awaiting completion), any transmit data is prevented from
862 	 ** being transferred from the write queue into the transmit packets
863 	 ** (add_transmit) and no furthur transmit interrupt will be sent for that
864 	 ** data. The next interrupt will occur up to 500ms later (RIOIntr is called
865 	 ** twice a second as a saftey measure). This was the case when kermit was
866 	 ** used to send data into a RIO port. After each packet was sent, TCFLSH
867 	 ** was called to flush the read queue preemptively. PortP->InUse was
868 	 ** incremented, thereby blocking the 6 byte acknowledgement packet
869 	 ** transmitted back. This acknowledgment hung around for 500ms before
870 	 ** being sent, thus reducing input performance substantially!.
871 	 ** When PortP->InUse becomes NOT_INUSE, we must ensure that any data
872 	 ** hanging around in the transmit buffer is sent immediately.
873 	 */
874 	writew(1, &PortP->HostP->ParmMapP->tx_intr);
875 	/* What to do here ..
876 	   wakeup( (caddr_t)&(PortP->InUse) );
877 	 */
878 	rio_spin_unlock_irqrestore(&PortP->portSem, flags);
879 	return 0;
880 }
881 
882 /*
883 **
884 ** How to use this file:
885 **
886 ** To send a command down a rup, you need to allocate a command block, fill
887 ** in the packet information, fill in the command number, fill in the pre-
888 ** and post- functions and arguments, and then add the command block to the
889 ** queue of command blocks for the port in question. When the port is idle,
890 ** then the pre-function will be called. If this returns RIO_FAIL then the
891 ** command will be re-queued and tried again at a later date (probably in one
892 ** clock tick). If the pre-function returns NOT RIO_FAIL, then the command
893 ** packet will be queued on the RUP, and the txcontrol field set to the
894 ** command number. When the txcontrol field has changed from being the
895 ** command number, then the post-function will be called, with the argument
896 ** specified earlier, a pointer to the command block, and the value of
897 ** txcontrol.
898 **
899 ** To allocate a command block, call RIOGetCmdBlk(). This returns a pointer
900 ** to the command block structure allocated, or NULL if there aren't any.
901 ** The block will have been zeroed for you.
902 **
903 ** The structure has the following fields:
904 **
905 ** struct CmdBlk
906 ** {
907 **	 struct CmdBlk *NextP;		  ** Pointer to next command block   **
908 **	 struct PKT	 Packet;		** A packet, to copy to the rup	**
909 **			int	 (*PreFuncP)();  ** The func to call to check if OK **
910 **			int	 PreArg;		** The arg for the func			**
911 **			int	 (*PostFuncP)(); ** The func to call when completed **
912 **			int	 PostArg;	   ** The arg for the func			**
913 ** };
914 **
915 ** You need to fill in ALL fields EXCEPT NextP, which is used to link the
916 ** blocks together either on the free list or on the Rup list.
917 **
918 ** Packet is an actual packet structure to be filled in with the packet
919 ** information associated with the command. You need to fill in everything,
920 ** as the command processor doesn't process the command packet in any way.
921 **
922 ** The PreFuncP is called before the packet is enqueued on the host rup.
923 ** PreFuncP is called as (*PreFuncP)(PreArg, CmdBlkP);. PreFuncP must
924 ** return !RIO_FAIL to have the packet queued on the rup, and RIO_FAIL
925 ** if the packet is NOT to be queued.
926 **
927 ** The PostFuncP is called when the command has completed. It is called
928 ** as (*PostFuncP)(PostArg, CmdBlkP, txcontrol);. PostFuncP is not expected
929 ** to return a value. PostFuncP does NOT need to free the command block,
930 ** as this happens automatically after PostFuncP returns.
931 **
932 ** Once the command block has been filled in, it is attached to the correct
933 ** queue by calling RIOQueueCmdBlk( HostP, Rup, CmdBlkP ) where HostP is
934 ** a pointer to the struct Host, Rup is the NUMBER of the rup (NOT a pointer
935 ** to it!), and CmdBlkP is the pointer to the command block allocated using
936 ** RIOGetCmdBlk().
937 **
938 */
939