Commit | Line | Data |
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1da177e4 LT |
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 : riointr.c | |
24 | ** SID : 1.2 | |
25 | ** Last Modified : 11/6/98 10:33:44 | |
26 | ** Retrieved : 11/6/98 10:33:49 | |
27 | ** | |
28 | ** ident @(#)riointr.c 1.2 | |
29 | ** | |
30 | ** ----------------------------------------------------------------------------- | |
31 | */ | |
1da177e4 LT |
32 | |
33 | #include <linux/module.h> | |
1da177e4 LT |
34 | #include <linux/errno.h> |
35 | #include <linux/tty.h> | |
33f0f88f | 36 | #include <linux/tty_flip.h> |
1da177e4 LT |
37 | #include <asm/io.h> |
38 | #include <asm/system.h> | |
39 | #include <asm/string.h> | |
1da177e4 LT |
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 | #include <linux/delay.h> | |
48 | ||
49 | #include "linux_compat.h" | |
50 | #include "rio_linux.h" | |
1da177e4 LT |
51 | #include "pkt.h" |
52 | #include "daemon.h" | |
53 | #include "rio.h" | |
54 | #include "riospace.h" | |
1da177e4 LT |
55 | #include "cmdpkt.h" |
56 | #include "map.h" | |
1da177e4 LT |
57 | #include "rup.h" |
58 | #include "port.h" | |
59 | #include "riodrvr.h" | |
60 | #include "rioinfo.h" | |
61 | #include "func.h" | |
62 | #include "errors.h" | |
63 | #include "pci.h" | |
64 | ||
65 | #include "parmmap.h" | |
66 | #include "unixrup.h" | |
67 | #include "board.h" | |
68 | #include "host.h" | |
1da177e4 LT |
69 | #include "phb.h" |
70 | #include "link.h" | |
71 | #include "cmdblk.h" | |
72 | #include "route.h" | |
1da177e4 LT |
73 | #include "cirrus.h" |
74 | #include "rioioctl.h" | |
75 | ||
76 | ||
77 | static void RIOReceive(struct rio_info *, struct Port *); | |
78 | ||
79 | ||
8d8706e2 | 80 | static char *firstchars(char *p, int nch) |
1da177e4 | 81 | { |
8d8706e2 AM |
82 | static char buf[2][128]; |
83 | static int t = 0; | |
84 | t = !t; | |
85 | memcpy(buf[t], p, nch); | |
86 | buf[t][nch] = 0; | |
87 | return buf[t]; | |
1da177e4 LT |
88 | } |
89 | ||
90 | ||
91 | #define INCR( P, I ) ((P) = (((P)+(I)) & p->RIOBufferMask)) | |
92 | /* Enable and start the transmission of packets */ | |
00d83a54 | 93 | void RIOTxEnable(char *en) |
1da177e4 | 94 | { |
8d8706e2 AM |
95 | struct Port *PortP; |
96 | struct rio_info *p; | |
97 | struct tty_struct *tty; | |
98 | int c; | |
d886cb58 | 99 | struct PKT __iomem *PacketP; |
8d8706e2 AM |
100 | unsigned long flags; |
101 | ||
102 | PortP = (struct Port *) en; | |
103 | p = (struct rio_info *) PortP->p; | |
b5391e29 | 104 | tty = PortP->gs.port.tty; |
8d8706e2 AM |
105 | |
106 | ||
107 | rio_dprintk(RIO_DEBUG_INTR, "tx port %d: %d chars queued.\n", PortP->PortNum, PortP->gs.xmit_cnt); | |
108 | ||
109 | if (!PortP->gs.xmit_cnt) | |
110 | return; | |
111 | ||
112 | ||
113 | /* This routine is an order of magnitude simpler than the specialix | |
114 | version. One of the disadvantages is that this version will send | |
115 | an incomplete packet (usually 64 bytes instead of 72) once for | |
116 | every 4k worth of data. Let's just say that this won't influence | |
117 | performance significantly..... */ | |
118 | ||
119 | rio_spin_lock_irqsave(&PortP->portSem, flags); | |
120 | ||
121 | while (can_add_transmit(&PacketP, PortP)) { | |
122 | c = PortP->gs.xmit_cnt; | |
123 | if (c > PKT_MAX_DATA_LEN) | |
124 | c = PKT_MAX_DATA_LEN; | |
125 | ||
126 | /* Don't copy past the end of the source buffer */ | |
127 | if (c > SERIAL_XMIT_SIZE - PortP->gs.xmit_tail) | |
128 | c = SERIAL_XMIT_SIZE - PortP->gs.xmit_tail; | |
129 | ||
130 | { | |
131 | int t; | |
132 | t = (c > 10) ? 10 : c; | |
133 | ||
134 | rio_dprintk(RIO_DEBUG_INTR, "rio: tx port %d: copying %d chars: %s - %s\n", PortP->PortNum, c, firstchars(PortP->gs.xmit_buf + PortP->gs.xmit_tail, t), firstchars(PortP->gs.xmit_buf + PortP->gs.xmit_tail + c - t, t)); | |
135 | } | |
136 | /* If for one reason or another, we can't copy more data, | |
137 | we're done! */ | |
138 | if (c == 0) | |
139 | break; | |
140 | ||
d886cb58 | 141 | rio_memcpy_toio(PortP->HostP->Caddr, PacketP->data, PortP->gs.xmit_buf + PortP->gs.xmit_tail, c); |
8d8706e2 AM |
142 | /* udelay (1); */ |
143 | ||
144 | writeb(c, &(PacketP->len)); | |
145 | if (!(PortP->State & RIO_DELETED)) { | |
146 | add_transmit(PortP); | |
147 | /* | |
148 | ** Count chars tx'd for port statistics reporting | |
149 | */ | |
150 | if (PortP->statsGather) | |
151 | PortP->txchars += c; | |
152 | } | |
153 | PortP->gs.xmit_tail = (PortP->gs.xmit_tail + c) & (SERIAL_XMIT_SIZE - 1); | |
154 | PortP->gs.xmit_cnt -= c; | |
155 | } | |
156 | ||
157 | rio_spin_unlock_irqrestore(&PortP->portSem, flags); | |
158 | ||
b963a844 | 159 | if (PortP->gs.xmit_cnt <= (PortP->gs.wakeup_chars + 2 * PKT_MAX_DATA_LEN)) |
b5391e29 | 160 | tty_wakeup(PortP->gs.port.tty); |
1da177e4 LT |
161 | |
162 | } | |
163 | ||
164 | ||
165 | /* | |
166 | ** RIO Host Service routine. Does all the work traditionally associated with an | |
167 | ** interrupt. | |
168 | */ | |
8d8706e2 AM |
169 | static int RupIntr; |
170 | static int RxIntr; | |
171 | static int TxIntr; | |
00d83a54 | 172 | |
c7bec5ab | 173 | void RIOServiceHost(struct rio_info *p, struct Host *HostP) |
1da177e4 | 174 | { |
8d8706e2 AM |
175 | rio_spin_lock(&HostP->HostLock); |
176 | if ((HostP->Flags & RUN_STATE) != RC_RUNNING) { | |
177 | static int t = 0; | |
178 | rio_spin_unlock(&HostP->HostLock); | |
179 | if ((t++ % 200) == 0) | |
180 | rio_dprintk(RIO_DEBUG_INTR, "Interrupt but host not running. flags=%x.\n", (int) HostP->Flags); | |
181 | return; | |
182 | } | |
183 | rio_spin_unlock(&HostP->HostLock); | |
184 | ||
00d83a54 AC |
185 | if (readw(&HostP->ParmMapP->rup_intr)) { |
186 | writew(0, &HostP->ParmMapP->rup_intr); | |
8d8706e2 AM |
187 | p->RIORupCount++; |
188 | RupIntr++; | |
00d83a54 | 189 | rio_dprintk(RIO_DEBUG_INTR, "rio: RUP interrupt on host %Zd\n", HostP - p->RIOHosts); |
8d8706e2 AM |
190 | RIOPollHostCommands(p, HostP); |
191 | } | |
192 | ||
00d83a54 | 193 | if (readw(&HostP->ParmMapP->rx_intr)) { |
8d8706e2 AM |
194 | int port; |
195 | ||
00d83a54 | 196 | writew(0, &HostP->ParmMapP->rx_intr); |
8d8706e2 AM |
197 | p->RIORxCount++; |
198 | RxIntr++; | |
199 | ||
00d83a54 | 200 | rio_dprintk(RIO_DEBUG_INTR, "rio: RX interrupt on host %Zd\n", HostP - p->RIOHosts); |
8d8706e2 AM |
201 | /* |
202 | ** Loop through every port. If the port is mapped into | |
203 | ** the system ( i.e. has /dev/ttyXXXX associated ) then it is | |
204 | ** worth checking. If the port isn't open, grab any packets | |
205 | ** hanging on its receive queue and stuff them on the free | |
206 | ** list; check for commands on the way. | |
207 | */ | |
208 | for (port = p->RIOFirstPortsBooted; port < p->RIOLastPortsBooted + PORTS_PER_RTA; port++) { | |
209 | struct Port *PortP = p->RIOPortp[port]; | |
210 | struct tty_struct *ttyP; | |
d886cb58 | 211 | struct PKT __iomem *PacketP; |
8d8706e2 AM |
212 | |
213 | /* | |
214 | ** not mapped in - most of the RIOPortp[] information | |
215 | ** has not been set up! | |
216 | ** Optimise: ports come in bundles of eight. | |
217 | */ | |
218 | if (!PortP->Mapped) { | |
219 | port += 7; | |
220 | continue; /* with the next port */ | |
221 | } | |
222 | ||
223 | /* | |
224 | ** If the host board isn't THIS host board, check the next one. | |
225 | ** optimise: ports come in bundles of eight. | |
226 | */ | |
227 | if (PortP->HostP != HostP) { | |
228 | port += 7; | |
229 | continue; | |
230 | } | |
231 | ||
232 | /* | |
233 | ** Let us see - is the port open? If not, then don't service it. | |
234 | */ | |
235 | if (!(PortP->PortState & PORT_ISOPEN)) { | |
236 | continue; | |
237 | } | |
238 | ||
239 | /* | |
240 | ** find corresponding tty structure. The process of mapping | |
241 | ** the ports puts these here. | |
242 | */ | |
b5391e29 | 243 | ttyP = PortP->gs.port.tty; |
8d8706e2 AM |
244 | |
245 | /* | |
246 | ** Lock the port before we begin working on it. | |
247 | */ | |
248 | rio_spin_lock(&PortP->portSem); | |
249 | ||
250 | /* | |
251 | ** Process received data if there is any. | |
252 | */ | |
253 | if (can_remove_receive(&PacketP, PortP)) | |
254 | RIOReceive(p, PortP); | |
255 | ||
256 | /* | |
257 | ** If there is no data left to be read from the port, and | |
258 | ** it's handshake bit is set, then we must clear the handshake, | |
259 | ** so that that downstream RTA is re-enabled. | |
260 | */ | |
00d83a54 | 261 | if (!can_remove_receive(&PacketP, PortP) && (readw(&PortP->PhbP->handshake) == PHB_HANDSHAKE_SET)) { |
1da177e4 | 262 | /* |
8d8706e2 AM |
263 | ** MAGIC! ( Basically, handshake the RX buffer, so that |
264 | ** the RTAs upstream can be re-enabled. ) | |
265 | */ | |
266 | rio_dprintk(RIO_DEBUG_INTR, "Set RX handshake bit\n"); | |
00d83a54 | 267 | writew(PHB_HANDSHAKE_SET | PHB_HANDSHAKE_RESET, &PortP->PhbP->handshake); |
8d8706e2 AM |
268 | } |
269 | rio_spin_unlock(&PortP->portSem); | |
270 | } | |
1da177e4 | 271 | } |
8d8706e2 | 272 | |
00d83a54 | 273 | if (readw(&HostP->ParmMapP->tx_intr)) { |
8d8706e2 AM |
274 | int port; |
275 | ||
00d83a54 | 276 | writew(0, &HostP->ParmMapP->tx_intr); |
8d8706e2 AM |
277 | |
278 | p->RIOTxCount++; | |
279 | TxIntr++; | |
00d83a54 | 280 | rio_dprintk(RIO_DEBUG_INTR, "rio: TX interrupt on host %Zd\n", HostP - p->RIOHosts); |
8d8706e2 AM |
281 | |
282 | /* | |
283 | ** Loop through every port. | |
284 | ** If the port is mapped into the system ( i.e. has /dev/ttyXXXX | |
285 | ** associated ) then it is worth checking. | |
286 | */ | |
287 | for (port = p->RIOFirstPortsBooted; port < p->RIOLastPortsBooted + PORTS_PER_RTA; port++) { | |
288 | struct Port *PortP = p->RIOPortp[port]; | |
289 | struct tty_struct *ttyP; | |
d886cb58 | 290 | struct PKT __iomem *PacketP; |
8d8706e2 AM |
291 | |
292 | /* | |
293 | ** not mapped in - most of the RIOPortp[] information | |
294 | ** has not been set up! | |
295 | */ | |
296 | if (!PortP->Mapped) { | |
297 | port += 7; | |
298 | continue; /* with the next port */ | |
299 | } | |
300 | ||
301 | /* | |
302 | ** If the host board isn't running, then its data structures | |
303 | ** are no use to us - continue quietly. | |
304 | */ | |
305 | if (PortP->HostP != HostP) { | |
306 | port += 7; | |
307 | continue; /* with the next port */ | |
308 | } | |
309 | ||
310 | /* | |
311 | ** Let us see - is the port open? If not, then don't service it. | |
312 | */ | |
313 | if (!(PortP->PortState & PORT_ISOPEN)) { | |
314 | continue; | |
315 | } | |
316 | ||
317 | rio_dprintk(RIO_DEBUG_INTR, "rio: Looking into port %d.\n", port); | |
318 | /* | |
319 | ** Lock the port before we begin working on it. | |
320 | */ | |
321 | rio_spin_lock(&PortP->portSem); | |
322 | ||
323 | /* | |
324 | ** If we can't add anything to the transmit queue, then | |
325 | ** we need do none of this processing. | |
326 | */ | |
327 | if (!can_add_transmit(&PacketP, PortP)) { | |
328 | rio_dprintk(RIO_DEBUG_INTR, "Can't add to port, so skipping.\n"); | |
329 | rio_spin_unlock(&PortP->portSem); | |
330 | continue; | |
331 | } | |
332 | ||
333 | /* | |
334 | ** find corresponding tty structure. The process of mapping | |
335 | ** the ports puts these here. | |
336 | */ | |
b5391e29 | 337 | ttyP = PortP->gs.port.tty; |
8d8706e2 AM |
338 | /* If ttyP is NULL, the port is getting closed. Forget about it. */ |
339 | if (!ttyP) { | |
340 | rio_dprintk(RIO_DEBUG_INTR, "no tty, so skipping.\n"); | |
341 | rio_spin_unlock(&PortP->portSem); | |
342 | continue; | |
343 | } | |
344 | /* | |
345 | ** If there is more room available we start up the transmit | |
346 | ** data process again. This can be direct I/O, if the cookmode | |
347 | ** is set to COOK_RAW or COOK_MEDIUM, or will be a call to the | |
348 | ** riotproc( T_OUTPUT ) if we are in COOK_WELL mode, to fetch | |
349 | ** characters via the line discipline. We must always call | |
350 | ** the line discipline, | |
351 | ** so that user input characters can be echoed correctly. | |
352 | ** | |
353 | ** ++++ Update +++++ | |
354 | ** With the advent of double buffering, we now see if | |
355 | ** TxBufferOut-In is non-zero. If so, then we copy a packet | |
356 | ** to the output place, and set it going. If this empties | |
357 | ** the buffer, then we must issue a wakeup( ) on OUT. | |
358 | ** If it frees space in the buffer then we must issue | |
359 | ** a wakeup( ) on IN. | |
360 | ** | |
361 | ** ++++ Extra! Extra! If PortP->WflushFlag is set, then we | |
362 | ** have to send a WFLUSH command down the PHB, to mark the | |
363 | ** end point of a WFLUSH. We also need to clear out any | |
364 | ** data from the double buffer! ( note that WflushFlag is a | |
365 | ** *count* of the number of WFLUSH commands outstanding! ) | |
366 | ** | |
367 | ** ++++ And there's more! | |
368 | ** If an RTA is powered off, then on again, and rebooted, | |
369 | ** whilst it has ports open, then we need to re-open the ports. | |
370 | ** ( reasonable enough ). We can't do this when we spot the | |
371 | ** re-boot, in interrupt time, because the queue is probably | |
372 | ** full. So, when we come in here, we need to test if any | |
373 | ** ports are in this condition, and re-open the port before | |
374 | ** we try to send any more data to it. Now, the re-booted | |
375 | ** RTA will be discarding packets from the PHB until it | |
376 | ** receives this open packet, but don't worry tooo much | |
377 | ** about that. The one thing that is interesting is the | |
378 | ** combination of this effect and the WFLUSH effect! | |
379 | */ | |
380 | /* For now don't handle RTA reboots. -- REW. | |
381 | Reenabled. Otherwise RTA reboots didn't work. Duh. -- REW */ | |
382 | if (PortP->MagicFlags) { | |
8d8706e2 AM |
383 | if (PortP->MagicFlags & MAGIC_REBOOT) { |
384 | /* | |
385 | ** well, the RTA has been rebooted, and there is room | |
386 | ** on its queue to add the open packet that is required. | |
387 | ** | |
388 | ** The messy part of this line is trying to decide if | |
389 | ** we need to call the Param function as a tty or as | |
390 | ** a modem. | |
391 | ** DONT USE CLOCAL AS A TEST FOR THIS! | |
392 | ** | |
393 | ** If we can't param the port, then move on to the | |
394 | ** next port. | |
395 | */ | |
396 | PortP->InUse = NOT_INUSE; | |
397 | ||
398 | rio_spin_unlock(&PortP->portSem); | |
d6f6341a | 399 | if (RIOParam(PortP, RIOC_OPEN, ((PortP->Cor2Copy & (RIOC_COR2_RTSFLOW | RIOC_COR2_CTSFLOW)) == (RIOC_COR2_RTSFLOW | RIOC_COR2_CTSFLOW)) ? 1 : 0, DONT_SLEEP) == RIO_FAIL) |
8d8706e2 | 400 | continue; /* with next port */ |
8d8706e2 AM |
401 | rio_spin_lock(&PortP->portSem); |
402 | PortP->MagicFlags &= ~MAGIC_REBOOT; | |
403 | } | |
1da177e4 | 404 | |
8d8706e2 AM |
405 | /* |
406 | ** As mentioned above, this is a tacky hack to cope | |
407 | ** with WFLUSH | |
408 | */ | |
409 | if (PortP->WflushFlag) { | |
410 | rio_dprintk(RIO_DEBUG_INTR, "Want to WFLUSH mark this port\n"); | |
411 | ||
412 | if (PortP->InUse) | |
413 | rio_dprintk(RIO_DEBUG_INTR, "FAILS - PORT IS IN USE\n"); | |
414 | } | |
415 | ||
416 | while (PortP->WflushFlag && can_add_transmit(&PacketP, PortP) && (PortP->InUse == NOT_INUSE)) { | |
417 | int p; | |
d886cb58 | 418 | struct PktCmd __iomem *PktCmdP; |
8d8706e2 AM |
419 | |
420 | rio_dprintk(RIO_DEBUG_INTR, "Add WFLUSH marker to data queue\n"); | |
421 | /* | |
422 | ** make it look just like a WFLUSH command | |
423 | */ | |
d886cb58 | 424 | PktCmdP = (struct PktCmd __iomem *) &PacketP->data[0]; |
8d8706e2 | 425 | |
d6f6341a | 426 | writeb(RIOC_WFLUSH, &PktCmdP->Command); |
8d8706e2 | 427 | |
00d83a54 | 428 | p = PortP->HostPort % (u16) PORTS_PER_RTA; |
8d8706e2 AM |
429 | |
430 | /* | |
431 | ** If second block of ports for 16 port RTA, add 8 | |
432 | ** to index 8-15. | |
433 | */ | |
434 | if (PortP->SecondBlock) | |
435 | p += PORTS_PER_RTA; | |
436 | ||
00d83a54 | 437 | writeb(p, &PktCmdP->PhbNum); |
8d8706e2 AM |
438 | |
439 | /* | |
440 | ** to make debuggery easier | |
441 | */ | |
00d83a54 AC |
442 | writeb('W', &PacketP->data[2]); |
443 | writeb('F', &PacketP->data[3]); | |
444 | writeb('L', &PacketP->data[4]); | |
445 | writeb('U', &PacketP->data[5]); | |
446 | writeb('S', &PacketP->data[6]); | |
447 | writeb('H', &PacketP->data[7]); | |
448 | writeb(' ', &PacketP->data[8]); | |
449 | writeb('0' + PortP->WflushFlag, &PacketP->data[9]); | |
450 | writeb(' ', &PacketP->data[10]); | |
451 | writeb(' ', &PacketP->data[11]); | |
452 | writeb('\0', &PacketP->data[12]); | |
8d8706e2 AM |
453 | |
454 | /* | |
455 | ** its two bytes long! | |
456 | */ | |
00d83a54 | 457 | writeb(PKT_CMD_BIT | 2, &PacketP->len); |
8d8706e2 AM |
458 | |
459 | /* | |
460 | ** queue it! | |
461 | */ | |
462 | if (!(PortP->State & RIO_DELETED)) { | |
463 | add_transmit(PortP); | |
464 | /* | |
465 | ** Count chars tx'd for port statistics reporting | |
466 | */ | |
467 | if (PortP->statsGather) | |
468 | PortP->txchars += 2; | |
469 | } | |
470 | ||
471 | if (--(PortP->WflushFlag) == 0) { | |
472 | PortP->MagicFlags &= ~MAGIC_FLUSH; | |
473 | } | |
474 | ||
475 | rio_dprintk(RIO_DEBUG_INTR, "Wflush count now stands at %d\n", PortP->WflushFlag); | |
476 | } | |
477 | if (PortP->MagicFlags & MORE_OUTPUT_EYGOR) { | |
478 | if (PortP->MagicFlags & MAGIC_FLUSH) { | |
479 | PortP->MagicFlags |= MORE_OUTPUT_EYGOR; | |
480 | } else { | |
481 | if (!can_add_transmit(&PacketP, PortP)) { | |
482 | rio_spin_unlock(&PortP->portSem); | |
483 | continue; | |
484 | } | |
485 | rio_spin_unlock(&PortP->portSem); | |
486 | RIOTxEnable((char *) PortP); | |
487 | rio_spin_lock(&PortP->portSem); | |
488 | PortP->MagicFlags &= ~MORE_OUTPUT_EYGOR; | |
489 | } | |
490 | } | |
491 | } | |
492 | ||
493 | ||
494 | /* | |
495 | ** If we can't add anything to the transmit queue, then | |
496 | ** we need do none of the remaining processing. | |
497 | */ | |
498 | if (!can_add_transmit(&PacketP, PortP)) { | |
499 | rio_spin_unlock(&PortP->portSem); | |
500 | continue; | |
501 | } | |
502 | ||
503 | rio_spin_unlock(&PortP->portSem); | |
504 | RIOTxEnable((char *) PortP); | |
505 | } | |
1da177e4 | 506 | } |
1da177e4 LT |
507 | } |
508 | ||
509 | /* | |
00d83a54 | 510 | ** Routine for handling received data for tty drivers |
1da177e4 | 511 | */ |
00d83a54 | 512 | static void RIOReceive(struct rio_info *p, struct Port *PortP) |
1da177e4 | 513 | { |
8d8706e2 | 514 | struct tty_struct *TtyP; |
00d83a54 | 515 | unsigned short transCount; |
d886cb58 | 516 | struct PKT __iomem *PacketP; |
00d83a54 | 517 | register unsigned int DataCnt; |
d886cb58 | 518 | unsigned char __iomem *ptr; |
8d8706e2 AM |
519 | unsigned char *buf; |
520 | int copied = 0; | |
521 | ||
522 | static int intCount, RxIntCnt; | |
523 | ||
524 | /* | |
525 | ** The receive data process is to remove packets from the | |
526 | ** PHB until there aren't any more or the current cblock | |
527 | ** is full. When this occurs, there will be some left over | |
528 | ** data in the packet, that we must do something with. | |
529 | ** As we haven't unhooked the packet from the read list | |
530 | ** yet, we can just leave the packet there, having first | |
531 | ** made a note of how far we got. This means that we need | |
532 | ** a pointer per port saying where we start taking the | |
533 | ** data from - this will normally be zero, but when we | |
534 | ** run out of space it will be set to the offset of the | |
535 | ** next byte to copy from the packet data area. The packet | |
536 | ** length field is decremented by the number of bytes that | |
d6e05edc | 537 | ** we successfully removed from the packet. When this reaches |
8d8706e2 AM |
538 | ** zero, we reset the offset pointer to be zero, and free |
539 | ** the packet from the front of the queue. | |
540 | */ | |
541 | ||
542 | intCount++; | |
543 | ||
b5391e29 | 544 | TtyP = PortP->gs.port.tty; |
8d8706e2 AM |
545 | if (!TtyP) { |
546 | rio_dprintk(RIO_DEBUG_INTR, "RIOReceive: tty is null. \n"); | |
547 | return; | |
1da177e4 | 548 | } |
8d8706e2 AM |
549 | |
550 | if (PortP->State & RIO_THROTTLE_RX) { | |
551 | rio_dprintk(RIO_DEBUG_INTR, "RIOReceive: Throttled. Can't handle more input.\n"); | |
552 | return; | |
553 | } | |
554 | ||
555 | if (PortP->State & RIO_DELETED) { | |
556 | while (can_remove_receive(&PacketP, PortP)) { | |
557 | remove_receive(PortP); | |
558 | put_free_end(PortP->HostP, PacketP); | |
559 | } | |
560 | } else { | |
561 | /* | |
562 | ** loop, just so long as: | |
563 | ** i ) there's some data ( i.e. can_remove_receive ) | |
564 | ** ii ) we haven't been blocked | |
565 | ** iii ) there's somewhere to put the data | |
566 | ** iv ) we haven't outstayed our welcome | |
567 | */ | |
568 | transCount = 1; | |
569 | while (can_remove_receive(&PacketP, PortP) | |
570 | && transCount) { | |
8d8706e2 AM |
571 | RxIntCnt++; |
572 | ||
573 | /* | |
574 | ** check that it is not a command! | |
575 | */ | |
92af11cd | 576 | if (readb(&PacketP->len) & PKT_CMD_BIT) { |
8d8706e2 AM |
577 | rio_dprintk(RIO_DEBUG_INTR, "RIO: unexpected command packet received on PHB\n"); |
578 | /* rio_dprint(RIO_DEBUG_INTR, (" sysport = %d\n", p->RIOPortp->PortNum)); */ | |
92af11cd AV |
579 | rio_dprintk(RIO_DEBUG_INTR, " dest_unit = %d\n", readb(&PacketP->dest_unit)); |
580 | rio_dprintk(RIO_DEBUG_INTR, " dest_port = %d\n", readb(&PacketP->dest_port)); | |
581 | rio_dprintk(RIO_DEBUG_INTR, " src_unit = %d\n", readb(&PacketP->src_unit)); | |
582 | rio_dprintk(RIO_DEBUG_INTR, " src_port = %d\n", readb(&PacketP->src_port)); | |
583 | rio_dprintk(RIO_DEBUG_INTR, " len = %d\n", readb(&PacketP->len)); | |
584 | rio_dprintk(RIO_DEBUG_INTR, " control = %d\n", readb(&PacketP->control)); | |
585 | rio_dprintk(RIO_DEBUG_INTR, " csum = %d\n", readw(&PacketP->csum)); | |
8d8706e2 AM |
586 | rio_dprintk(RIO_DEBUG_INTR, " data bytes: "); |
587 | for (DataCnt = 0; DataCnt < PKT_MAX_DATA_LEN; DataCnt++) | |
92af11cd | 588 | rio_dprintk(RIO_DEBUG_INTR, "%d\n", readb(&PacketP->data[DataCnt])); |
8d8706e2 AM |
589 | remove_receive(PortP); |
590 | put_free_end(PortP->HostP, PacketP); | |
591 | continue; /* with next packet */ | |
592 | } | |
593 | ||
594 | /* | |
595 | ** How many characters can we move 'upstream' ? | |
596 | ** | |
597 | ** Determine the minimum of the amount of data | |
598 | ** available and the amount of space in which to | |
599 | ** put it. | |
600 | ** | |
601 | ** 1. Get the packet length by masking 'len' | |
602 | ** for only the length bits. | |
603 | ** 2. Available space is [buffer size] - [space used] | |
604 | ** | |
605 | ** Transfer count is the minimum of packet length | |
606 | ** and available space. | |
607 | */ | |
608 | ||
92af11cd | 609 | transCount = tty_buffer_request_room(TtyP, readb(&PacketP->len) & PKT_LEN_MASK); |
8d8706e2 AM |
610 | rio_dprintk(RIO_DEBUG_REC, "port %d: Copy %d bytes\n", PortP->PortNum, transCount); |
611 | /* | |
612 | ** To use the following 'kkprintfs' for debugging - change the '#undef' | |
613 | ** to '#define', (this is the only place ___DEBUG_IT___ occurs in the | |
614 | ** driver). | |
615 | */ | |
d886cb58 | 616 | ptr = (unsigned char __iomem *) PacketP->data + PortP->RxDataStart; |
1da177e4 | 617 | |
8d8706e2 AM |
618 | tty_prepare_flip_string(TtyP, &buf, transCount); |
619 | rio_memcpy_fromio(buf, ptr, transCount); | |
8d8706e2 | 620 | PortP->RxDataStart += transCount; |
92af11cd | 621 | writeb(readb(&PacketP->len)-transCount, &PacketP->len); |
8d8706e2 | 622 | copied += transCount; |
1da177e4 LT |
623 | |
624 | ||
1da177e4 | 625 | |
92af11cd | 626 | if (readb(&PacketP->len) == 0) { |
1da177e4 | 627 | /* |
8d8706e2 AM |
628 | ** If we have emptied the packet, then we can |
629 | ** free it, and reset the start pointer for | |
630 | ** the next packet. | |
631 | */ | |
632 | remove_receive(PortP); | |
633 | put_free_end(PortP->HostP, PacketP); | |
634 | PortP->RxDataStart = 0; | |
8d8706e2 AM |
635 | } |
636 | } | |
637 | } | |
638 | if (copied) { | |
639 | rio_dprintk(RIO_DEBUG_REC, "port %d: pushing tty flip buffer: %d total bytes copied.\n", PortP->PortNum, copied); | |
640 | tty_flip_buffer_push(TtyP); | |
1da177e4 | 641 | } |
1da177e4 | 642 | |
8d8706e2 | 643 | return; |
1da177e4 LT |
644 | } |
645 |