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> | |
34 | #include <linux/slab.h> | |
35 | #include <linux/errno.h> | |
36 | #include <linux/tty.h> | |
33f0f88f | 37 | #include <linux/tty_flip.h> |
1da177e4 LT |
38 | #include <asm/io.h> |
39 | #include <asm/system.h> | |
40 | #include <asm/string.h> | |
1da177e4 LT |
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/delay.h> | |
49 | ||
50 | #include "linux_compat.h" | |
51 | #include "rio_linux.h" | |
1da177e4 LT |
52 | #include "pkt.h" |
53 | #include "daemon.h" | |
54 | #include "rio.h" | |
55 | #include "riospace.h" | |
1da177e4 LT |
56 | #include "cmdpkt.h" |
57 | #include "map.h" | |
1da177e4 LT |
58 | #include "rup.h" |
59 | #include "port.h" | |
60 | #include "riodrvr.h" | |
61 | #include "rioinfo.h" | |
62 | #include "func.h" | |
63 | #include "errors.h" | |
64 | #include "pci.h" | |
65 | ||
66 | #include "parmmap.h" | |
67 | #include "unixrup.h" | |
68 | #include "board.h" | |
69 | #include "host.h" | |
1da177e4 LT |
70 | #include "phb.h" |
71 | #include "link.h" | |
72 | #include "cmdblk.h" | |
73 | #include "route.h" | |
1da177e4 LT |
74 | #include "cirrus.h" |
75 | #include "rioioctl.h" | |
76 | ||
77 | ||
78 | static void RIOReceive(struct rio_info *, struct Port *); | |
79 | ||
80 | ||
8d8706e2 | 81 | static char *firstchars(char *p, int nch) |
1da177e4 | 82 | { |
8d8706e2 AM |
83 | static char buf[2][128]; |
84 | static int t = 0; | |
85 | t = !t; | |
86 | memcpy(buf[t], p, nch); | |
87 | buf[t][nch] = 0; | |
88 | return buf[t]; | |
1da177e4 LT |
89 | } |
90 | ||
91 | ||
92 | #define INCR( P, I ) ((P) = (((P)+(I)) & p->RIOBufferMask)) | |
93 | /* Enable and start the transmission of packets */ | |
00d83a54 | 94 | void RIOTxEnable(char *en) |
1da177e4 | 95 | { |
8d8706e2 AM |
96 | struct Port *PortP; |
97 | struct rio_info *p; | |
98 | struct tty_struct *tty; | |
99 | int c; | |
d886cb58 | 100 | struct PKT __iomem *PacketP; |
8d8706e2 AM |
101 | unsigned long flags; |
102 | ||
103 | PortP = (struct Port *) en; | |
104 | p = (struct rio_info *) PortP->p; | |
b5391e29 | 105 | tty = PortP->gs.port.tty; |
8d8706e2 AM |
106 | |
107 | ||
108 | rio_dprintk(RIO_DEBUG_INTR, "tx port %d: %d chars queued.\n", PortP->PortNum, PortP->gs.xmit_cnt); | |
109 | ||
110 | if (!PortP->gs.xmit_cnt) | |
111 | return; | |
112 | ||
113 | ||
114 | /* This routine is an order of magnitude simpler than the specialix | |
115 | version. One of the disadvantages is that this version will send | |
116 | an incomplete packet (usually 64 bytes instead of 72) once for | |
117 | every 4k worth of data. Let's just say that this won't influence | |
118 | performance significantly..... */ | |
119 | ||
120 | rio_spin_lock_irqsave(&PortP->portSem, flags); | |
121 | ||
122 | while (can_add_transmit(&PacketP, PortP)) { | |
123 | c = PortP->gs.xmit_cnt; | |
124 | if (c > PKT_MAX_DATA_LEN) | |
125 | c = PKT_MAX_DATA_LEN; | |
126 | ||
127 | /* Don't copy past the end of the source buffer */ | |
128 | if (c > SERIAL_XMIT_SIZE - PortP->gs.xmit_tail) | |
129 | c = SERIAL_XMIT_SIZE - PortP->gs.xmit_tail; | |
130 | ||
131 | { | |
132 | int t; | |
133 | t = (c > 10) ? 10 : c; | |
134 | ||
135 | 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)); | |
136 | } | |
137 | /* If for one reason or another, we can't copy more data, | |
138 | we're done! */ | |
139 | if (c == 0) | |
140 | break; | |
141 | ||
d886cb58 | 142 | rio_memcpy_toio(PortP->HostP->Caddr, PacketP->data, PortP->gs.xmit_buf + PortP->gs.xmit_tail, c); |
8d8706e2 AM |
143 | /* udelay (1); */ |
144 | ||
145 | writeb(c, &(PacketP->len)); | |
146 | if (!(PortP->State & RIO_DELETED)) { | |
147 | add_transmit(PortP); | |
148 | /* | |
149 | ** Count chars tx'd for port statistics reporting | |
150 | */ | |
151 | if (PortP->statsGather) | |
152 | PortP->txchars += c; | |
153 | } | |
154 | PortP->gs.xmit_tail = (PortP->gs.xmit_tail + c) & (SERIAL_XMIT_SIZE - 1); | |
155 | PortP->gs.xmit_cnt -= c; | |
156 | } | |
157 | ||
158 | rio_spin_unlock_irqrestore(&PortP->portSem, flags); | |
159 | ||
b963a844 | 160 | if (PortP->gs.xmit_cnt <= (PortP->gs.wakeup_chars + 2 * PKT_MAX_DATA_LEN)) |
b5391e29 | 161 | tty_wakeup(PortP->gs.port.tty); |
1da177e4 LT |
162 | |
163 | } | |
164 | ||
165 | ||
166 | /* | |
167 | ** RIO Host Service routine. Does all the work traditionally associated with an | |
168 | ** interrupt. | |
169 | */ | |
8d8706e2 AM |
170 | static int RupIntr; |
171 | static int RxIntr; | |
172 | static int TxIntr; | |
00d83a54 | 173 | |
c7bec5ab | 174 | void RIOServiceHost(struct rio_info *p, struct Host *HostP) |
1da177e4 | 175 | { |
8d8706e2 AM |
176 | rio_spin_lock(&HostP->HostLock); |
177 | if ((HostP->Flags & RUN_STATE) != RC_RUNNING) { | |
178 | static int t = 0; | |
179 | rio_spin_unlock(&HostP->HostLock); | |
180 | if ((t++ % 200) == 0) | |
181 | rio_dprintk(RIO_DEBUG_INTR, "Interrupt but host not running. flags=%x.\n", (int) HostP->Flags); | |
182 | return; | |
183 | } | |
184 | rio_spin_unlock(&HostP->HostLock); | |
185 | ||
00d83a54 AC |
186 | if (readw(&HostP->ParmMapP->rup_intr)) { |
187 | writew(0, &HostP->ParmMapP->rup_intr); | |
8d8706e2 AM |
188 | p->RIORupCount++; |
189 | RupIntr++; | |
00d83a54 | 190 | rio_dprintk(RIO_DEBUG_INTR, "rio: RUP interrupt on host %Zd\n", HostP - p->RIOHosts); |
8d8706e2 AM |
191 | RIOPollHostCommands(p, HostP); |
192 | } | |
193 | ||
00d83a54 | 194 | if (readw(&HostP->ParmMapP->rx_intr)) { |
8d8706e2 AM |
195 | int port; |
196 | ||
00d83a54 | 197 | writew(0, &HostP->ParmMapP->rx_intr); |
8d8706e2 AM |
198 | p->RIORxCount++; |
199 | RxIntr++; | |
200 | ||
00d83a54 | 201 | rio_dprintk(RIO_DEBUG_INTR, "rio: RX interrupt on host %Zd\n", HostP - p->RIOHosts); |
8d8706e2 AM |
202 | /* |
203 | ** Loop through every port. If the port is mapped into | |
204 | ** the system ( i.e. has /dev/ttyXXXX associated ) then it is | |
205 | ** worth checking. If the port isn't open, grab any packets | |
206 | ** hanging on its receive queue and stuff them on the free | |
207 | ** list; check for commands on the way. | |
208 | */ | |
209 | for (port = p->RIOFirstPortsBooted; port < p->RIOLastPortsBooted + PORTS_PER_RTA; port++) { | |
210 | struct Port *PortP = p->RIOPortp[port]; | |
211 | struct tty_struct *ttyP; | |
d886cb58 | 212 | struct PKT __iomem *PacketP; |
8d8706e2 AM |
213 | |
214 | /* | |
215 | ** not mapped in - most of the RIOPortp[] information | |
216 | ** has not been set up! | |
217 | ** Optimise: ports come in bundles of eight. | |
218 | */ | |
219 | if (!PortP->Mapped) { | |
220 | port += 7; | |
221 | continue; /* with the next port */ | |
222 | } | |
223 | ||
224 | /* | |
225 | ** If the host board isn't THIS host board, check the next one. | |
226 | ** optimise: ports come in bundles of eight. | |
227 | */ | |
228 | if (PortP->HostP != HostP) { | |
229 | port += 7; | |
230 | continue; | |
231 | } | |
232 | ||
233 | /* | |
234 | ** Let us see - is the port open? If not, then don't service it. | |
235 | */ | |
236 | if (!(PortP->PortState & PORT_ISOPEN)) { | |
237 | continue; | |
238 | } | |
239 | ||
240 | /* | |
241 | ** find corresponding tty structure. The process of mapping | |
242 | ** the ports puts these here. | |
243 | */ | |
b5391e29 | 244 | ttyP = PortP->gs.port.tty; |
8d8706e2 AM |
245 | |
246 | /* | |
247 | ** Lock the port before we begin working on it. | |
248 | */ | |
249 | rio_spin_lock(&PortP->portSem); | |
250 | ||
251 | /* | |
252 | ** Process received data if there is any. | |
253 | */ | |
254 | if (can_remove_receive(&PacketP, PortP)) | |
255 | RIOReceive(p, PortP); | |
256 | ||
257 | /* | |
258 | ** If there is no data left to be read from the port, and | |
259 | ** it's handshake bit is set, then we must clear the handshake, | |
260 | ** so that that downstream RTA is re-enabled. | |
261 | */ | |
00d83a54 | 262 | if (!can_remove_receive(&PacketP, PortP) && (readw(&PortP->PhbP->handshake) == PHB_HANDSHAKE_SET)) { |
1da177e4 | 263 | /* |
8d8706e2 AM |
264 | ** MAGIC! ( Basically, handshake the RX buffer, so that |
265 | ** the RTAs upstream can be re-enabled. ) | |
266 | */ | |
267 | rio_dprintk(RIO_DEBUG_INTR, "Set RX handshake bit\n"); | |
00d83a54 | 268 | writew(PHB_HANDSHAKE_SET | PHB_HANDSHAKE_RESET, &PortP->PhbP->handshake); |
8d8706e2 AM |
269 | } |
270 | rio_spin_unlock(&PortP->portSem); | |
271 | } | |
1da177e4 | 272 | } |
8d8706e2 | 273 | |
00d83a54 | 274 | if (readw(&HostP->ParmMapP->tx_intr)) { |
8d8706e2 AM |
275 | int port; |
276 | ||
00d83a54 | 277 | writew(0, &HostP->ParmMapP->tx_intr); |
8d8706e2 AM |
278 | |
279 | p->RIOTxCount++; | |
280 | TxIntr++; | |
00d83a54 | 281 | rio_dprintk(RIO_DEBUG_INTR, "rio: TX interrupt on host %Zd\n", HostP - p->RIOHosts); |
8d8706e2 AM |
282 | |
283 | /* | |
284 | ** Loop through every port. | |
285 | ** If the port is mapped into the system ( i.e. has /dev/ttyXXXX | |
286 | ** associated ) then it is worth checking. | |
287 | */ | |
288 | for (port = p->RIOFirstPortsBooted; port < p->RIOLastPortsBooted + PORTS_PER_RTA; port++) { | |
289 | struct Port *PortP = p->RIOPortp[port]; | |
290 | struct tty_struct *ttyP; | |
d886cb58 | 291 | struct PKT __iomem *PacketP; |
8d8706e2 AM |
292 | |
293 | /* | |
294 | ** not mapped in - most of the RIOPortp[] information | |
295 | ** has not been set up! | |
296 | */ | |
297 | if (!PortP->Mapped) { | |
298 | port += 7; | |
299 | continue; /* with the next port */ | |
300 | } | |
301 | ||
302 | /* | |
303 | ** If the host board isn't running, then its data structures | |
304 | ** are no use to us - continue quietly. | |
305 | */ | |
306 | if (PortP->HostP != HostP) { | |
307 | port += 7; | |
308 | continue; /* with the next port */ | |
309 | } | |
310 | ||
311 | /* | |
312 | ** Let us see - is the port open? If not, then don't service it. | |
313 | */ | |
314 | if (!(PortP->PortState & PORT_ISOPEN)) { | |
315 | continue; | |
316 | } | |
317 | ||
318 | rio_dprintk(RIO_DEBUG_INTR, "rio: Looking into port %d.\n", port); | |
319 | /* | |
320 | ** Lock the port before we begin working on it. | |
321 | */ | |
322 | rio_spin_lock(&PortP->portSem); | |
323 | ||
324 | /* | |
325 | ** If we can't add anything to the transmit queue, then | |
326 | ** we need do none of this processing. | |
327 | */ | |
328 | if (!can_add_transmit(&PacketP, PortP)) { | |
329 | rio_dprintk(RIO_DEBUG_INTR, "Can't add to port, so skipping.\n"); | |
330 | rio_spin_unlock(&PortP->portSem); | |
331 | continue; | |
332 | } | |
333 | ||
334 | /* | |
335 | ** find corresponding tty structure. The process of mapping | |
336 | ** the ports puts these here. | |
337 | */ | |
b5391e29 | 338 | ttyP = PortP->gs.port.tty; |
8d8706e2 AM |
339 | /* If ttyP is NULL, the port is getting closed. Forget about it. */ |
340 | if (!ttyP) { | |
341 | rio_dprintk(RIO_DEBUG_INTR, "no tty, so skipping.\n"); | |
342 | rio_spin_unlock(&PortP->portSem); | |
343 | continue; | |
344 | } | |
345 | /* | |
346 | ** If there is more room available we start up the transmit | |
347 | ** data process again. This can be direct I/O, if the cookmode | |
348 | ** is set to COOK_RAW or COOK_MEDIUM, or will be a call to the | |
349 | ** riotproc( T_OUTPUT ) if we are in COOK_WELL mode, to fetch | |
350 | ** characters via the line discipline. We must always call | |
351 | ** the line discipline, | |
352 | ** so that user input characters can be echoed correctly. | |
353 | ** | |
354 | ** ++++ Update +++++ | |
355 | ** With the advent of double buffering, we now see if | |
356 | ** TxBufferOut-In is non-zero. If so, then we copy a packet | |
357 | ** to the output place, and set it going. If this empties | |
358 | ** the buffer, then we must issue a wakeup( ) on OUT. | |
359 | ** If it frees space in the buffer then we must issue | |
360 | ** a wakeup( ) on IN. | |
361 | ** | |
362 | ** ++++ Extra! Extra! If PortP->WflushFlag is set, then we | |
363 | ** have to send a WFLUSH command down the PHB, to mark the | |
364 | ** end point of a WFLUSH. We also need to clear out any | |
365 | ** data from the double buffer! ( note that WflushFlag is a | |
366 | ** *count* of the number of WFLUSH commands outstanding! ) | |
367 | ** | |
368 | ** ++++ And there's more! | |
369 | ** If an RTA is powered off, then on again, and rebooted, | |
370 | ** whilst it has ports open, then we need to re-open the ports. | |
371 | ** ( reasonable enough ). We can't do this when we spot the | |
372 | ** re-boot, in interrupt time, because the queue is probably | |
373 | ** full. So, when we come in here, we need to test if any | |
374 | ** ports are in this condition, and re-open the port before | |
375 | ** we try to send any more data to it. Now, the re-booted | |
376 | ** RTA will be discarding packets from the PHB until it | |
377 | ** receives this open packet, but don't worry tooo much | |
378 | ** about that. The one thing that is interesting is the | |
379 | ** combination of this effect and the WFLUSH effect! | |
380 | */ | |
381 | /* For now don't handle RTA reboots. -- REW. | |
382 | Reenabled. Otherwise RTA reboots didn't work. Duh. -- REW */ | |
383 | if (PortP->MagicFlags) { | |
8d8706e2 AM |
384 | if (PortP->MagicFlags & MAGIC_REBOOT) { |
385 | /* | |
386 | ** well, the RTA has been rebooted, and there is room | |
387 | ** on its queue to add the open packet that is required. | |
388 | ** | |
389 | ** The messy part of this line is trying to decide if | |
390 | ** we need to call the Param function as a tty or as | |
391 | ** a modem. | |
392 | ** DONT USE CLOCAL AS A TEST FOR THIS! | |
393 | ** | |
394 | ** If we can't param the port, then move on to the | |
395 | ** next port. | |
396 | */ | |
397 | PortP->InUse = NOT_INUSE; | |
398 | ||
399 | rio_spin_unlock(&PortP->portSem); | |
d6f6341a | 400 | 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 | 401 | continue; /* with next port */ |
8d8706e2 AM |
402 | rio_spin_lock(&PortP->portSem); |
403 | PortP->MagicFlags &= ~MAGIC_REBOOT; | |
404 | } | |
1da177e4 | 405 | |
8d8706e2 AM |
406 | /* |
407 | ** As mentioned above, this is a tacky hack to cope | |
408 | ** with WFLUSH | |
409 | */ | |
410 | if (PortP->WflushFlag) { | |
411 | rio_dprintk(RIO_DEBUG_INTR, "Want to WFLUSH mark this port\n"); | |
412 | ||
413 | if (PortP->InUse) | |
414 | rio_dprintk(RIO_DEBUG_INTR, "FAILS - PORT IS IN USE\n"); | |
415 | } | |
416 | ||
417 | while (PortP->WflushFlag && can_add_transmit(&PacketP, PortP) && (PortP->InUse == NOT_INUSE)) { | |
418 | int p; | |
d886cb58 | 419 | struct PktCmd __iomem *PktCmdP; |
8d8706e2 AM |
420 | |
421 | rio_dprintk(RIO_DEBUG_INTR, "Add WFLUSH marker to data queue\n"); | |
422 | /* | |
423 | ** make it look just like a WFLUSH command | |
424 | */ | |
d886cb58 | 425 | PktCmdP = (struct PktCmd __iomem *) &PacketP->data[0]; |
8d8706e2 | 426 | |
d6f6341a | 427 | writeb(RIOC_WFLUSH, &PktCmdP->Command); |
8d8706e2 | 428 | |
00d83a54 | 429 | p = PortP->HostPort % (u16) PORTS_PER_RTA; |
8d8706e2 AM |
430 | |
431 | /* | |
432 | ** If second block of ports for 16 port RTA, add 8 | |
433 | ** to index 8-15. | |
434 | */ | |
435 | if (PortP->SecondBlock) | |
436 | p += PORTS_PER_RTA; | |
437 | ||
00d83a54 | 438 | writeb(p, &PktCmdP->PhbNum); |
8d8706e2 AM |
439 | |
440 | /* | |
441 | ** to make debuggery easier | |
442 | */ | |
00d83a54 AC |
443 | writeb('W', &PacketP->data[2]); |
444 | writeb('F', &PacketP->data[3]); | |
445 | writeb('L', &PacketP->data[4]); | |
446 | writeb('U', &PacketP->data[5]); | |
447 | writeb('S', &PacketP->data[6]); | |
448 | writeb('H', &PacketP->data[7]); | |
449 | writeb(' ', &PacketP->data[8]); | |
450 | writeb('0' + PortP->WflushFlag, &PacketP->data[9]); | |
451 | writeb(' ', &PacketP->data[10]); | |
452 | writeb(' ', &PacketP->data[11]); | |
453 | writeb('\0', &PacketP->data[12]); | |
8d8706e2 AM |
454 | |
455 | /* | |
456 | ** its two bytes long! | |
457 | */ | |
00d83a54 | 458 | writeb(PKT_CMD_BIT | 2, &PacketP->len); |
8d8706e2 AM |
459 | |
460 | /* | |
461 | ** queue it! | |
462 | */ | |
463 | if (!(PortP->State & RIO_DELETED)) { | |
464 | add_transmit(PortP); | |
465 | /* | |
466 | ** Count chars tx'd for port statistics reporting | |
467 | */ | |
468 | if (PortP->statsGather) | |
469 | PortP->txchars += 2; | |
470 | } | |
471 | ||
472 | if (--(PortP->WflushFlag) == 0) { | |
473 | PortP->MagicFlags &= ~MAGIC_FLUSH; | |
474 | } | |
475 | ||
476 | rio_dprintk(RIO_DEBUG_INTR, "Wflush count now stands at %d\n", PortP->WflushFlag); | |
477 | } | |
478 | if (PortP->MagicFlags & MORE_OUTPUT_EYGOR) { | |
479 | if (PortP->MagicFlags & MAGIC_FLUSH) { | |
480 | PortP->MagicFlags |= MORE_OUTPUT_EYGOR; | |
481 | } else { | |
482 | if (!can_add_transmit(&PacketP, PortP)) { | |
483 | rio_spin_unlock(&PortP->portSem); | |
484 | continue; | |
485 | } | |
486 | rio_spin_unlock(&PortP->portSem); | |
487 | RIOTxEnable((char *) PortP); | |
488 | rio_spin_lock(&PortP->portSem); | |
489 | PortP->MagicFlags &= ~MORE_OUTPUT_EYGOR; | |
490 | } | |
491 | } | |
492 | } | |
493 | ||
494 | ||
495 | /* | |
496 | ** If we can't add anything to the transmit queue, then | |
497 | ** we need do none of the remaining processing. | |
498 | */ | |
499 | if (!can_add_transmit(&PacketP, PortP)) { | |
500 | rio_spin_unlock(&PortP->portSem); | |
501 | continue; | |
502 | } | |
503 | ||
504 | rio_spin_unlock(&PortP->portSem); | |
505 | RIOTxEnable((char *) PortP); | |
506 | } | |
1da177e4 | 507 | } |
1da177e4 LT |
508 | } |
509 | ||
510 | /* | |
00d83a54 | 511 | ** Routine for handling received data for tty drivers |
1da177e4 | 512 | */ |
00d83a54 | 513 | static void RIOReceive(struct rio_info *p, struct Port *PortP) |
1da177e4 | 514 | { |
8d8706e2 | 515 | struct tty_struct *TtyP; |
00d83a54 | 516 | unsigned short transCount; |
d886cb58 | 517 | struct PKT __iomem *PacketP; |
00d83a54 | 518 | register unsigned int DataCnt; |
d886cb58 | 519 | unsigned char __iomem *ptr; |
8d8706e2 AM |
520 | unsigned char *buf; |
521 | int copied = 0; | |
522 | ||
523 | static int intCount, RxIntCnt; | |
524 | ||
525 | /* | |
526 | ** The receive data process is to remove packets from the | |
527 | ** PHB until there aren't any more or the current cblock | |
528 | ** is full. When this occurs, there will be some left over | |
529 | ** data in the packet, that we must do something with. | |
530 | ** As we haven't unhooked the packet from the read list | |
531 | ** yet, we can just leave the packet there, having first | |
532 | ** made a note of how far we got. This means that we need | |
533 | ** a pointer per port saying where we start taking the | |
534 | ** data from - this will normally be zero, but when we | |
535 | ** run out of space it will be set to the offset of the | |
536 | ** next byte to copy from the packet data area. The packet | |
537 | ** length field is decremented by the number of bytes that | |
d6e05edc | 538 | ** we successfully removed from the packet. When this reaches |
8d8706e2 AM |
539 | ** zero, we reset the offset pointer to be zero, and free |
540 | ** the packet from the front of the queue. | |
541 | */ | |
542 | ||
543 | intCount++; | |
544 | ||
b5391e29 | 545 | TtyP = PortP->gs.port.tty; |
8d8706e2 AM |
546 | if (!TtyP) { |
547 | rio_dprintk(RIO_DEBUG_INTR, "RIOReceive: tty is null. \n"); | |
548 | return; | |
1da177e4 | 549 | } |
8d8706e2 AM |
550 | |
551 | if (PortP->State & RIO_THROTTLE_RX) { | |
552 | rio_dprintk(RIO_DEBUG_INTR, "RIOReceive: Throttled. Can't handle more input.\n"); | |
553 | return; | |
554 | } | |
555 | ||
556 | if (PortP->State & RIO_DELETED) { | |
557 | while (can_remove_receive(&PacketP, PortP)) { | |
558 | remove_receive(PortP); | |
559 | put_free_end(PortP->HostP, PacketP); | |
560 | } | |
561 | } else { | |
562 | /* | |
563 | ** loop, just so long as: | |
564 | ** i ) there's some data ( i.e. can_remove_receive ) | |
565 | ** ii ) we haven't been blocked | |
566 | ** iii ) there's somewhere to put the data | |
567 | ** iv ) we haven't outstayed our welcome | |
568 | */ | |
569 | transCount = 1; | |
570 | while (can_remove_receive(&PacketP, PortP) | |
571 | && transCount) { | |
8d8706e2 AM |
572 | RxIntCnt++; |
573 | ||
574 | /* | |
575 | ** check that it is not a command! | |
576 | */ | |
92af11cd | 577 | if (readb(&PacketP->len) & PKT_CMD_BIT) { |
8d8706e2 AM |
578 | rio_dprintk(RIO_DEBUG_INTR, "RIO: unexpected command packet received on PHB\n"); |
579 | /* rio_dprint(RIO_DEBUG_INTR, (" sysport = %d\n", p->RIOPortp->PortNum)); */ | |
92af11cd AV |
580 | rio_dprintk(RIO_DEBUG_INTR, " dest_unit = %d\n", readb(&PacketP->dest_unit)); |
581 | rio_dprintk(RIO_DEBUG_INTR, " dest_port = %d\n", readb(&PacketP->dest_port)); | |
582 | rio_dprintk(RIO_DEBUG_INTR, " src_unit = %d\n", readb(&PacketP->src_unit)); | |
583 | rio_dprintk(RIO_DEBUG_INTR, " src_port = %d\n", readb(&PacketP->src_port)); | |
584 | rio_dprintk(RIO_DEBUG_INTR, " len = %d\n", readb(&PacketP->len)); | |
585 | rio_dprintk(RIO_DEBUG_INTR, " control = %d\n", readb(&PacketP->control)); | |
586 | rio_dprintk(RIO_DEBUG_INTR, " csum = %d\n", readw(&PacketP->csum)); | |
8d8706e2 AM |
587 | rio_dprintk(RIO_DEBUG_INTR, " data bytes: "); |
588 | for (DataCnt = 0; DataCnt < PKT_MAX_DATA_LEN; DataCnt++) | |
92af11cd | 589 | rio_dprintk(RIO_DEBUG_INTR, "%d\n", readb(&PacketP->data[DataCnt])); |
8d8706e2 AM |
590 | remove_receive(PortP); |
591 | put_free_end(PortP->HostP, PacketP); | |
592 | continue; /* with next packet */ | |
593 | } | |
594 | ||
595 | /* | |
596 | ** How many characters can we move 'upstream' ? | |
597 | ** | |
598 | ** Determine the minimum of the amount of data | |
599 | ** available and the amount of space in which to | |
600 | ** put it. | |
601 | ** | |
602 | ** 1. Get the packet length by masking 'len' | |
603 | ** for only the length bits. | |
604 | ** 2. Available space is [buffer size] - [space used] | |
605 | ** | |
606 | ** Transfer count is the minimum of packet length | |
607 | ** and available space. | |
608 | */ | |
609 | ||
92af11cd | 610 | transCount = tty_buffer_request_room(TtyP, readb(&PacketP->len) & PKT_LEN_MASK); |
8d8706e2 AM |
611 | rio_dprintk(RIO_DEBUG_REC, "port %d: Copy %d bytes\n", PortP->PortNum, transCount); |
612 | /* | |
613 | ** To use the following 'kkprintfs' for debugging - change the '#undef' | |
614 | ** to '#define', (this is the only place ___DEBUG_IT___ occurs in the | |
615 | ** driver). | |
616 | */ | |
d886cb58 | 617 | ptr = (unsigned char __iomem *) PacketP->data + PortP->RxDataStart; |
1da177e4 | 618 | |
8d8706e2 AM |
619 | tty_prepare_flip_string(TtyP, &buf, transCount); |
620 | rio_memcpy_fromio(buf, ptr, transCount); | |
8d8706e2 | 621 | PortP->RxDataStart += transCount; |
92af11cd | 622 | writeb(readb(&PacketP->len)-transCount, &PacketP->len); |
8d8706e2 | 623 | copied += transCount; |
1da177e4 LT |
624 | |
625 | ||
1da177e4 | 626 | |
92af11cd | 627 | if (readb(&PacketP->len) == 0) { |
1da177e4 | 628 | /* |
8d8706e2 AM |
629 | ** If we have emptied the packet, then we can |
630 | ** free it, and reset the start pointer for | |
631 | ** the next packet. | |
632 | */ | |
633 | remove_receive(PortP); | |
634 | put_free_end(PortP->HostP, PacketP); | |
635 | PortP->RxDataStart = 0; | |
8d8706e2 AM |
636 | } |
637 | } | |
638 | } | |
639 | if (copied) { | |
640 | rio_dprintk(RIO_DEBUG_REC, "port %d: pushing tty flip buffer: %d total bytes copied.\n", PortP->PortNum, copied); | |
641 | tty_flip_buffer_push(TtyP); | |
1da177e4 | 642 | } |
1da177e4 | 643 | |
8d8706e2 | 644 | return; |
1da177e4 LT |
645 | } |
646 |