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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 | */ | |
32 | #ifdef SCCS_LABELS | |
33 | static char *_riointr_c_sccs_ = "@(#)riointr.c 1.2"; | |
34 | #endif | |
35 | ||
36 | ||
37 | #include <linux/module.h> | |
38 | #include <linux/slab.h> | |
39 | #include <linux/errno.h> | |
40 | #include <linux/tty.h> | |
33f0f88f | 41 | #include <linux/tty_flip.h> |
1da177e4 LT |
42 | #include <asm/io.h> |
43 | #include <asm/system.h> | |
44 | #include <asm/string.h> | |
45 | #include <asm/semaphore.h> | |
46 | #include <asm/uaccess.h> | |
47 | ||
48 | #include <linux/termios.h> | |
49 | #include <linux/serial.h> | |
50 | ||
51 | #include <linux/generic_serial.h> | |
52 | ||
53 | #include <linux/delay.h> | |
54 | ||
55 | #include "linux_compat.h" | |
56 | #include "rio_linux.h" | |
1da177e4 LT |
57 | #include "pkt.h" |
58 | #include "daemon.h" | |
59 | #include "rio.h" | |
60 | #include "riospace.h" | |
1da177e4 LT |
61 | #include "cmdpkt.h" |
62 | #include "map.h" | |
1da177e4 LT |
63 | #include "rup.h" |
64 | #include "port.h" | |
65 | #include "riodrvr.h" | |
66 | #include "rioinfo.h" | |
67 | #include "func.h" | |
68 | #include "errors.h" | |
69 | #include "pci.h" | |
70 | ||
71 | #include "parmmap.h" | |
72 | #include "unixrup.h" | |
73 | #include "board.h" | |
74 | #include "host.h" | |
1da177e4 LT |
75 | #include "phb.h" |
76 | #include "link.h" | |
77 | #include "cmdblk.h" | |
78 | #include "route.h" | |
1da177e4 LT |
79 | #include "cirrus.h" |
80 | #include "rioioctl.h" | |
81 | ||
82 | ||
83 | static void RIOReceive(struct rio_info *, struct Port *); | |
84 | ||
85 | ||
8d8706e2 | 86 | static char *firstchars(char *p, int nch) |
1da177e4 | 87 | { |
8d8706e2 AM |
88 | static char buf[2][128]; |
89 | static int t = 0; | |
90 | t = !t; | |
91 | memcpy(buf[t], p, nch); | |
92 | buf[t][nch] = 0; | |
93 | return buf[t]; | |
1da177e4 LT |
94 | } |
95 | ||
96 | ||
97 | #define INCR( P, I ) ((P) = (((P)+(I)) & p->RIOBufferMask)) | |
98 | /* Enable and start the transmission of packets */ | |
00d83a54 | 99 | void RIOTxEnable(char *en) |
1da177e4 | 100 | { |
8d8706e2 AM |
101 | struct Port *PortP; |
102 | struct rio_info *p; | |
103 | struct tty_struct *tty; | |
104 | int c; | |
d886cb58 | 105 | struct PKT __iomem *PacketP; |
8d8706e2 AM |
106 | unsigned long flags; |
107 | ||
108 | PortP = (struct Port *) en; | |
109 | p = (struct rio_info *) PortP->p; | |
110 | tty = PortP->gs.tty; | |
111 | ||
112 | ||
113 | rio_dprintk(RIO_DEBUG_INTR, "tx port %d: %d chars queued.\n", PortP->PortNum, PortP->gs.xmit_cnt); | |
114 | ||
115 | if (!PortP->gs.xmit_cnt) | |
116 | return; | |
117 | ||
118 | ||
119 | /* This routine is an order of magnitude simpler than the specialix | |
120 | version. One of the disadvantages is that this version will send | |
121 | an incomplete packet (usually 64 bytes instead of 72) once for | |
122 | every 4k worth of data. Let's just say that this won't influence | |
123 | performance significantly..... */ | |
124 | ||
125 | rio_spin_lock_irqsave(&PortP->portSem, flags); | |
126 | ||
127 | while (can_add_transmit(&PacketP, PortP)) { | |
128 | c = PortP->gs.xmit_cnt; | |
129 | if (c > PKT_MAX_DATA_LEN) | |
130 | c = PKT_MAX_DATA_LEN; | |
131 | ||
132 | /* Don't copy past the end of the source buffer */ | |
133 | if (c > SERIAL_XMIT_SIZE - PortP->gs.xmit_tail) | |
134 | c = SERIAL_XMIT_SIZE - PortP->gs.xmit_tail; | |
135 | ||
136 | { | |
137 | int t; | |
138 | t = (c > 10) ? 10 : c; | |
139 | ||
140 | 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)); | |
141 | } | |
142 | /* If for one reason or another, we can't copy more data, | |
143 | we're done! */ | |
144 | if (c == 0) | |
145 | break; | |
146 | ||
d886cb58 | 147 | rio_memcpy_toio(PortP->HostP->Caddr, PacketP->data, PortP->gs.xmit_buf + PortP->gs.xmit_tail, c); |
8d8706e2 AM |
148 | /* udelay (1); */ |
149 | ||
150 | writeb(c, &(PacketP->len)); | |
151 | if (!(PortP->State & RIO_DELETED)) { | |
152 | add_transmit(PortP); | |
153 | /* | |
154 | ** Count chars tx'd for port statistics reporting | |
155 | */ | |
156 | if (PortP->statsGather) | |
157 | PortP->txchars += c; | |
158 | } | |
159 | PortP->gs.xmit_tail = (PortP->gs.xmit_tail + c) & (SERIAL_XMIT_SIZE - 1); | |
160 | PortP->gs.xmit_cnt -= c; | |
161 | } | |
162 | ||
163 | rio_spin_unlock_irqrestore(&PortP->portSem, flags); | |
164 | ||
165 | if (PortP->gs.xmit_cnt <= (PortP->gs.wakeup_chars + 2 * PKT_MAX_DATA_LEN)) { | |
166 | rio_dprintk(RIO_DEBUG_INTR, "Waking up.... ldisc:%d (%d/%d)....", (int) (PortP->gs.tty->flags & (1 << TTY_DO_WRITE_WAKEUP)), PortP->gs.wakeup_chars, PortP->gs.xmit_cnt); | |
167 | if ((PortP->gs.tty->flags & (1 << TTY_DO_WRITE_WAKEUP)) && PortP->gs.tty->ldisc.write_wakeup) | |
168 | (PortP->gs.tty->ldisc.write_wakeup) (PortP->gs.tty); | |
169 | rio_dprintk(RIO_DEBUG_INTR, "(%d/%d)\n", PortP->gs.wakeup_chars, PortP->gs.xmit_cnt); | |
170 | wake_up_interruptible(&PortP->gs.tty->write_wait); | |
171 | } | |
1da177e4 LT |
172 | |
173 | } | |
174 | ||
175 | ||
176 | /* | |
177 | ** RIO Host Service routine. Does all the work traditionally associated with an | |
178 | ** interrupt. | |
179 | */ | |
8d8706e2 AM |
180 | static int RupIntr; |
181 | static int RxIntr; | |
182 | static int TxIntr; | |
00d83a54 | 183 | |
c7bec5ab | 184 | void RIOServiceHost(struct rio_info *p, struct Host *HostP) |
1da177e4 | 185 | { |
8d8706e2 AM |
186 | rio_spin_lock(&HostP->HostLock); |
187 | if ((HostP->Flags & RUN_STATE) != RC_RUNNING) { | |
188 | static int t = 0; | |
189 | rio_spin_unlock(&HostP->HostLock); | |
190 | if ((t++ % 200) == 0) | |
191 | rio_dprintk(RIO_DEBUG_INTR, "Interrupt but host not running. flags=%x.\n", (int) HostP->Flags); | |
192 | return; | |
193 | } | |
194 | rio_spin_unlock(&HostP->HostLock); | |
195 | ||
00d83a54 AC |
196 | if (readw(&HostP->ParmMapP->rup_intr)) { |
197 | writew(0, &HostP->ParmMapP->rup_intr); | |
8d8706e2 AM |
198 | p->RIORupCount++; |
199 | RupIntr++; | |
00d83a54 | 200 | rio_dprintk(RIO_DEBUG_INTR, "rio: RUP interrupt on host %Zd\n", HostP - p->RIOHosts); |
8d8706e2 AM |
201 | RIOPollHostCommands(p, HostP); |
202 | } | |
203 | ||
00d83a54 | 204 | if (readw(&HostP->ParmMapP->rx_intr)) { |
8d8706e2 AM |
205 | int port; |
206 | ||
00d83a54 | 207 | writew(0, &HostP->ParmMapP->rx_intr); |
8d8706e2 AM |
208 | p->RIORxCount++; |
209 | RxIntr++; | |
210 | ||
00d83a54 | 211 | rio_dprintk(RIO_DEBUG_INTR, "rio: RX interrupt on host %Zd\n", HostP - p->RIOHosts); |
8d8706e2 AM |
212 | /* |
213 | ** Loop through every port. If the port is mapped into | |
214 | ** the system ( i.e. has /dev/ttyXXXX associated ) then it is | |
215 | ** worth checking. If the port isn't open, grab any packets | |
216 | ** hanging on its receive queue and stuff them on the free | |
217 | ** list; check for commands on the way. | |
218 | */ | |
219 | for (port = p->RIOFirstPortsBooted; port < p->RIOLastPortsBooted + PORTS_PER_RTA; port++) { | |
220 | struct Port *PortP = p->RIOPortp[port]; | |
221 | struct tty_struct *ttyP; | |
d886cb58 | 222 | struct PKT __iomem *PacketP; |
8d8706e2 AM |
223 | |
224 | /* | |
225 | ** not mapped in - most of the RIOPortp[] information | |
226 | ** has not been set up! | |
227 | ** Optimise: ports come in bundles of eight. | |
228 | */ | |
229 | if (!PortP->Mapped) { | |
230 | port += 7; | |
231 | continue; /* with the next port */ | |
232 | } | |
233 | ||
234 | /* | |
235 | ** If the host board isn't THIS host board, check the next one. | |
236 | ** optimise: ports come in bundles of eight. | |
237 | */ | |
238 | if (PortP->HostP != HostP) { | |
239 | port += 7; | |
240 | continue; | |
241 | } | |
242 | ||
243 | /* | |
244 | ** Let us see - is the port open? If not, then don't service it. | |
245 | */ | |
246 | if (!(PortP->PortState & PORT_ISOPEN)) { | |
247 | continue; | |
248 | } | |
249 | ||
250 | /* | |
251 | ** find corresponding tty structure. The process of mapping | |
252 | ** the ports puts these here. | |
253 | */ | |
254 | ttyP = PortP->gs.tty; | |
255 | ||
256 | /* | |
257 | ** Lock the port before we begin working on it. | |
258 | */ | |
259 | rio_spin_lock(&PortP->portSem); | |
260 | ||
261 | /* | |
262 | ** Process received data if there is any. | |
263 | */ | |
264 | if (can_remove_receive(&PacketP, PortP)) | |
265 | RIOReceive(p, PortP); | |
266 | ||
267 | /* | |
268 | ** If there is no data left to be read from the port, and | |
269 | ** it's handshake bit is set, then we must clear the handshake, | |
270 | ** so that that downstream RTA is re-enabled. | |
271 | */ | |
00d83a54 | 272 | if (!can_remove_receive(&PacketP, PortP) && (readw(&PortP->PhbP->handshake) == PHB_HANDSHAKE_SET)) { |
1da177e4 | 273 | /* |
8d8706e2 AM |
274 | ** MAGIC! ( Basically, handshake the RX buffer, so that |
275 | ** the RTAs upstream can be re-enabled. ) | |
276 | */ | |
277 | rio_dprintk(RIO_DEBUG_INTR, "Set RX handshake bit\n"); | |
00d83a54 | 278 | writew(PHB_HANDSHAKE_SET | PHB_HANDSHAKE_RESET, &PortP->PhbP->handshake); |
8d8706e2 AM |
279 | } |
280 | rio_spin_unlock(&PortP->portSem); | |
281 | } | |
1da177e4 | 282 | } |
8d8706e2 | 283 | |
00d83a54 | 284 | if (readw(&HostP->ParmMapP->tx_intr)) { |
8d8706e2 AM |
285 | int port; |
286 | ||
00d83a54 | 287 | writew(0, &HostP->ParmMapP->tx_intr); |
8d8706e2 AM |
288 | |
289 | p->RIOTxCount++; | |
290 | TxIntr++; | |
00d83a54 | 291 | rio_dprintk(RIO_DEBUG_INTR, "rio: TX interrupt on host %Zd\n", HostP - p->RIOHosts); |
8d8706e2 AM |
292 | |
293 | /* | |
294 | ** Loop through every port. | |
295 | ** If the port is mapped into the system ( i.e. has /dev/ttyXXXX | |
296 | ** associated ) then it is worth checking. | |
297 | */ | |
298 | for (port = p->RIOFirstPortsBooted; port < p->RIOLastPortsBooted + PORTS_PER_RTA; port++) { | |
299 | struct Port *PortP = p->RIOPortp[port]; | |
300 | struct tty_struct *ttyP; | |
d886cb58 | 301 | struct PKT __iomem *PacketP; |
8d8706e2 AM |
302 | |
303 | /* | |
304 | ** not mapped in - most of the RIOPortp[] information | |
305 | ** has not been set up! | |
306 | */ | |
307 | if (!PortP->Mapped) { | |
308 | port += 7; | |
309 | continue; /* with the next port */ | |
310 | } | |
311 | ||
312 | /* | |
313 | ** If the host board isn't running, then its data structures | |
314 | ** are no use to us - continue quietly. | |
315 | */ | |
316 | if (PortP->HostP != HostP) { | |
317 | port += 7; | |
318 | continue; /* with the next port */ | |
319 | } | |
320 | ||
321 | /* | |
322 | ** Let us see - is the port open? If not, then don't service it. | |
323 | */ | |
324 | if (!(PortP->PortState & PORT_ISOPEN)) { | |
325 | continue; | |
326 | } | |
327 | ||
328 | rio_dprintk(RIO_DEBUG_INTR, "rio: Looking into port %d.\n", port); | |
329 | /* | |
330 | ** Lock the port before we begin working on it. | |
331 | */ | |
332 | rio_spin_lock(&PortP->portSem); | |
333 | ||
334 | /* | |
335 | ** If we can't add anything to the transmit queue, then | |
336 | ** we need do none of this processing. | |
337 | */ | |
338 | if (!can_add_transmit(&PacketP, PortP)) { | |
339 | rio_dprintk(RIO_DEBUG_INTR, "Can't add to port, so skipping.\n"); | |
340 | rio_spin_unlock(&PortP->portSem); | |
341 | continue; | |
342 | } | |
343 | ||
344 | /* | |
345 | ** find corresponding tty structure. The process of mapping | |
346 | ** the ports puts these here. | |
347 | */ | |
348 | ttyP = PortP->gs.tty; | |
349 | /* If ttyP is NULL, the port is getting closed. Forget about it. */ | |
350 | if (!ttyP) { | |
351 | rio_dprintk(RIO_DEBUG_INTR, "no tty, so skipping.\n"); | |
352 | rio_spin_unlock(&PortP->portSem); | |
353 | continue; | |
354 | } | |
355 | /* | |
356 | ** If there is more room available we start up the transmit | |
357 | ** data process again. This can be direct I/O, if the cookmode | |
358 | ** is set to COOK_RAW or COOK_MEDIUM, or will be a call to the | |
359 | ** riotproc( T_OUTPUT ) if we are in COOK_WELL mode, to fetch | |
360 | ** characters via the line discipline. We must always call | |
361 | ** the line discipline, | |
362 | ** so that user input characters can be echoed correctly. | |
363 | ** | |
364 | ** ++++ Update +++++ | |
365 | ** With the advent of double buffering, we now see if | |
366 | ** TxBufferOut-In is non-zero. If so, then we copy a packet | |
367 | ** to the output place, and set it going. If this empties | |
368 | ** the buffer, then we must issue a wakeup( ) on OUT. | |
369 | ** If it frees space in the buffer then we must issue | |
370 | ** a wakeup( ) on IN. | |
371 | ** | |
372 | ** ++++ Extra! Extra! If PortP->WflushFlag is set, then we | |
373 | ** have to send a WFLUSH command down the PHB, to mark the | |
374 | ** end point of a WFLUSH. We also need to clear out any | |
375 | ** data from the double buffer! ( note that WflushFlag is a | |
376 | ** *count* of the number of WFLUSH commands outstanding! ) | |
377 | ** | |
378 | ** ++++ And there's more! | |
379 | ** If an RTA is powered off, then on again, and rebooted, | |
380 | ** whilst it has ports open, then we need to re-open the ports. | |
381 | ** ( reasonable enough ). We can't do this when we spot the | |
382 | ** re-boot, in interrupt time, because the queue is probably | |
383 | ** full. So, when we come in here, we need to test if any | |
384 | ** ports are in this condition, and re-open the port before | |
385 | ** we try to send any more data to it. Now, the re-booted | |
386 | ** RTA will be discarding packets from the PHB until it | |
387 | ** receives this open packet, but don't worry tooo much | |
388 | ** about that. The one thing that is interesting is the | |
389 | ** combination of this effect and the WFLUSH effect! | |
390 | */ | |
391 | /* For now don't handle RTA reboots. -- REW. | |
392 | Reenabled. Otherwise RTA reboots didn't work. Duh. -- REW */ | |
393 | if (PortP->MagicFlags) { | |
8d8706e2 AM |
394 | if (PortP->MagicFlags & MAGIC_REBOOT) { |
395 | /* | |
396 | ** well, the RTA has been rebooted, and there is room | |
397 | ** on its queue to add the open packet that is required. | |
398 | ** | |
399 | ** The messy part of this line is trying to decide if | |
400 | ** we need to call the Param function as a tty or as | |
401 | ** a modem. | |
402 | ** DONT USE CLOCAL AS A TEST FOR THIS! | |
403 | ** | |
404 | ** If we can't param the port, then move on to the | |
405 | ** next port. | |
406 | */ | |
407 | PortP->InUse = NOT_INUSE; | |
408 | ||
409 | rio_spin_unlock(&PortP->portSem); | |
554b7c80 | 410 | if (RIOParam(PortP, OPEN, ((PortP->Cor2Copy & (COR2_RTSFLOW | COR2_CTSFLOW)) == (COR2_RTSFLOW | COR2_CTSFLOW)) ? 1 : 0, DONT_SLEEP) == RIO_FAIL) { |
8d8706e2 AM |
411 | continue; /* with next port */ |
412 | } | |
413 | rio_spin_lock(&PortP->portSem); | |
414 | PortP->MagicFlags &= ~MAGIC_REBOOT; | |
415 | } | |
1da177e4 | 416 | |
8d8706e2 AM |
417 | /* |
418 | ** As mentioned above, this is a tacky hack to cope | |
419 | ** with WFLUSH | |
420 | */ | |
421 | if (PortP->WflushFlag) { | |
422 | rio_dprintk(RIO_DEBUG_INTR, "Want to WFLUSH mark this port\n"); | |
423 | ||
424 | if (PortP->InUse) | |
425 | rio_dprintk(RIO_DEBUG_INTR, "FAILS - PORT IS IN USE\n"); | |
426 | } | |
427 | ||
428 | while (PortP->WflushFlag && can_add_transmit(&PacketP, PortP) && (PortP->InUse == NOT_INUSE)) { | |
429 | int p; | |
d886cb58 | 430 | struct PktCmd __iomem *PktCmdP; |
8d8706e2 AM |
431 | |
432 | rio_dprintk(RIO_DEBUG_INTR, "Add WFLUSH marker to data queue\n"); | |
433 | /* | |
434 | ** make it look just like a WFLUSH command | |
435 | */ | |
d886cb58 | 436 | PktCmdP = (struct PktCmd __iomem *) &PacketP->data[0]; |
8d8706e2 | 437 | |
00d83a54 | 438 | writeb(WFLUSH, &PktCmdP->Command); |
8d8706e2 | 439 | |
00d83a54 | 440 | p = PortP->HostPort % (u16) PORTS_PER_RTA; |
8d8706e2 AM |
441 | |
442 | /* | |
443 | ** If second block of ports for 16 port RTA, add 8 | |
444 | ** to index 8-15. | |
445 | */ | |
446 | if (PortP->SecondBlock) | |
447 | p += PORTS_PER_RTA; | |
448 | ||
00d83a54 | 449 | writeb(p, &PktCmdP->PhbNum); |
8d8706e2 AM |
450 | |
451 | /* | |
452 | ** to make debuggery easier | |
453 | */ | |
00d83a54 AC |
454 | writeb('W', &PacketP->data[2]); |
455 | writeb('F', &PacketP->data[3]); | |
456 | writeb('L', &PacketP->data[4]); | |
457 | writeb('U', &PacketP->data[5]); | |
458 | writeb('S', &PacketP->data[6]); | |
459 | writeb('H', &PacketP->data[7]); | |
460 | writeb(' ', &PacketP->data[8]); | |
461 | writeb('0' + PortP->WflushFlag, &PacketP->data[9]); | |
462 | writeb(' ', &PacketP->data[10]); | |
463 | writeb(' ', &PacketP->data[11]); | |
464 | writeb('\0', &PacketP->data[12]); | |
8d8706e2 AM |
465 | |
466 | /* | |
467 | ** its two bytes long! | |
468 | */ | |
00d83a54 | 469 | writeb(PKT_CMD_BIT | 2, &PacketP->len); |
8d8706e2 AM |
470 | |
471 | /* | |
472 | ** queue it! | |
473 | */ | |
474 | if (!(PortP->State & RIO_DELETED)) { | |
475 | add_transmit(PortP); | |
476 | /* | |
477 | ** Count chars tx'd for port statistics reporting | |
478 | */ | |
479 | if (PortP->statsGather) | |
480 | PortP->txchars += 2; | |
481 | } | |
482 | ||
483 | if (--(PortP->WflushFlag) == 0) { | |
484 | PortP->MagicFlags &= ~MAGIC_FLUSH; | |
485 | } | |
486 | ||
487 | rio_dprintk(RIO_DEBUG_INTR, "Wflush count now stands at %d\n", PortP->WflushFlag); | |
488 | } | |
489 | if (PortP->MagicFlags & MORE_OUTPUT_EYGOR) { | |
490 | if (PortP->MagicFlags & MAGIC_FLUSH) { | |
491 | PortP->MagicFlags |= MORE_OUTPUT_EYGOR; | |
492 | } else { | |
493 | if (!can_add_transmit(&PacketP, PortP)) { | |
494 | rio_spin_unlock(&PortP->portSem); | |
495 | continue; | |
496 | } | |
497 | rio_spin_unlock(&PortP->portSem); | |
498 | RIOTxEnable((char *) PortP); | |
499 | rio_spin_lock(&PortP->portSem); | |
500 | PortP->MagicFlags &= ~MORE_OUTPUT_EYGOR; | |
501 | } | |
502 | } | |
503 | } | |
504 | ||
505 | ||
506 | /* | |
507 | ** If we can't add anything to the transmit queue, then | |
508 | ** we need do none of the remaining processing. | |
509 | */ | |
510 | if (!can_add_transmit(&PacketP, PortP)) { | |
511 | rio_spin_unlock(&PortP->portSem); | |
512 | continue; | |
513 | } | |
514 | ||
515 | rio_spin_unlock(&PortP->portSem); | |
516 | RIOTxEnable((char *) PortP); | |
517 | } | |
1da177e4 | 518 | } |
1da177e4 LT |
519 | } |
520 | ||
521 | /* | |
00d83a54 | 522 | ** Routine for handling received data for tty drivers |
1da177e4 | 523 | */ |
00d83a54 | 524 | static void RIOReceive(struct rio_info *p, struct Port *PortP) |
1da177e4 | 525 | { |
8d8706e2 | 526 | struct tty_struct *TtyP; |
00d83a54 | 527 | unsigned short transCount; |
d886cb58 | 528 | struct PKT __iomem *PacketP; |
00d83a54 | 529 | register unsigned int DataCnt; |
d886cb58 | 530 | unsigned char __iomem *ptr; |
8d8706e2 AM |
531 | unsigned char *buf; |
532 | int copied = 0; | |
533 | ||
534 | static int intCount, RxIntCnt; | |
535 | ||
536 | /* | |
537 | ** The receive data process is to remove packets from the | |
538 | ** PHB until there aren't any more or the current cblock | |
539 | ** is full. When this occurs, there will be some left over | |
540 | ** data in the packet, that we must do something with. | |
541 | ** As we haven't unhooked the packet from the read list | |
542 | ** yet, we can just leave the packet there, having first | |
543 | ** made a note of how far we got. This means that we need | |
544 | ** a pointer per port saying where we start taking the | |
545 | ** data from - this will normally be zero, but when we | |
546 | ** run out of space it will be set to the offset of the | |
547 | ** next byte to copy from the packet data area. The packet | |
548 | ** length field is decremented by the number of bytes that | |
d6e05edc | 549 | ** we successfully removed from the packet. When this reaches |
8d8706e2 AM |
550 | ** zero, we reset the offset pointer to be zero, and free |
551 | ** the packet from the front of the queue. | |
552 | */ | |
553 | ||
554 | intCount++; | |
555 | ||
556 | TtyP = PortP->gs.tty; | |
557 | if (!TtyP) { | |
558 | rio_dprintk(RIO_DEBUG_INTR, "RIOReceive: tty is null. \n"); | |
559 | return; | |
1da177e4 | 560 | } |
8d8706e2 AM |
561 | |
562 | if (PortP->State & RIO_THROTTLE_RX) { | |
563 | rio_dprintk(RIO_DEBUG_INTR, "RIOReceive: Throttled. Can't handle more input.\n"); | |
564 | return; | |
565 | } | |
566 | ||
567 | if (PortP->State & RIO_DELETED) { | |
568 | while (can_remove_receive(&PacketP, PortP)) { | |
569 | remove_receive(PortP); | |
570 | put_free_end(PortP->HostP, PacketP); | |
571 | } | |
572 | } else { | |
573 | /* | |
574 | ** loop, just so long as: | |
575 | ** i ) there's some data ( i.e. can_remove_receive ) | |
576 | ** ii ) we haven't been blocked | |
577 | ** iii ) there's somewhere to put the data | |
578 | ** iv ) we haven't outstayed our welcome | |
579 | */ | |
580 | transCount = 1; | |
581 | while (can_remove_receive(&PacketP, PortP) | |
582 | && transCount) { | |
8d8706e2 AM |
583 | RxIntCnt++; |
584 | ||
585 | /* | |
586 | ** check that it is not a command! | |
587 | */ | |
92af11cd | 588 | if (readb(&PacketP->len) & PKT_CMD_BIT) { |
8d8706e2 AM |
589 | rio_dprintk(RIO_DEBUG_INTR, "RIO: unexpected command packet received on PHB\n"); |
590 | /* rio_dprint(RIO_DEBUG_INTR, (" sysport = %d\n", p->RIOPortp->PortNum)); */ | |
92af11cd AV |
591 | rio_dprintk(RIO_DEBUG_INTR, " dest_unit = %d\n", readb(&PacketP->dest_unit)); |
592 | rio_dprintk(RIO_DEBUG_INTR, " dest_port = %d\n", readb(&PacketP->dest_port)); | |
593 | rio_dprintk(RIO_DEBUG_INTR, " src_unit = %d\n", readb(&PacketP->src_unit)); | |
594 | rio_dprintk(RIO_DEBUG_INTR, " src_port = %d\n", readb(&PacketP->src_port)); | |
595 | rio_dprintk(RIO_DEBUG_INTR, " len = %d\n", readb(&PacketP->len)); | |
596 | rio_dprintk(RIO_DEBUG_INTR, " control = %d\n", readb(&PacketP->control)); | |
597 | rio_dprintk(RIO_DEBUG_INTR, " csum = %d\n", readw(&PacketP->csum)); | |
8d8706e2 AM |
598 | rio_dprintk(RIO_DEBUG_INTR, " data bytes: "); |
599 | for (DataCnt = 0; DataCnt < PKT_MAX_DATA_LEN; DataCnt++) | |
92af11cd | 600 | rio_dprintk(RIO_DEBUG_INTR, "%d\n", readb(&PacketP->data[DataCnt])); |
8d8706e2 AM |
601 | remove_receive(PortP); |
602 | put_free_end(PortP->HostP, PacketP); | |
603 | continue; /* with next packet */ | |
604 | } | |
605 | ||
606 | /* | |
607 | ** How many characters can we move 'upstream' ? | |
608 | ** | |
609 | ** Determine the minimum of the amount of data | |
610 | ** available and the amount of space in which to | |
611 | ** put it. | |
612 | ** | |
613 | ** 1. Get the packet length by masking 'len' | |
614 | ** for only the length bits. | |
615 | ** 2. Available space is [buffer size] - [space used] | |
616 | ** | |
617 | ** Transfer count is the minimum of packet length | |
618 | ** and available space. | |
619 | */ | |
620 | ||
92af11cd | 621 | transCount = tty_buffer_request_room(TtyP, readb(&PacketP->len) & PKT_LEN_MASK); |
8d8706e2 AM |
622 | rio_dprintk(RIO_DEBUG_REC, "port %d: Copy %d bytes\n", PortP->PortNum, transCount); |
623 | /* | |
624 | ** To use the following 'kkprintfs' for debugging - change the '#undef' | |
625 | ** to '#define', (this is the only place ___DEBUG_IT___ occurs in the | |
626 | ** driver). | |
627 | */ | |
d886cb58 | 628 | ptr = (unsigned char __iomem *) PacketP->data + PortP->RxDataStart; |
1da177e4 | 629 | |
8d8706e2 AM |
630 | tty_prepare_flip_string(TtyP, &buf, transCount); |
631 | rio_memcpy_fromio(buf, ptr, transCount); | |
8d8706e2 | 632 | PortP->RxDataStart += transCount; |
92af11cd | 633 | writeb(readb(&PacketP->len)-transCount, &PacketP->len); |
8d8706e2 | 634 | copied += transCount; |
1da177e4 LT |
635 | |
636 | ||
1da177e4 | 637 | |
92af11cd | 638 | if (readb(&PacketP->len) == 0) { |
1da177e4 | 639 | /* |
8d8706e2 AM |
640 | ** If we have emptied the packet, then we can |
641 | ** free it, and reset the start pointer for | |
642 | ** the next packet. | |
643 | */ | |
644 | remove_receive(PortP); | |
645 | put_free_end(PortP->HostP, PacketP); | |
646 | PortP->RxDataStart = 0; | |
8d8706e2 AM |
647 | } |
648 | } | |
649 | } | |
650 | if (copied) { | |
651 | rio_dprintk(RIO_DEBUG_REC, "port %d: pushing tty flip buffer: %d total bytes copied.\n", PortP->PortNum, copied); | |
652 | tty_flip_buffer_push(TtyP); | |
1da177e4 | 653 | } |
1da177e4 | 654 | |
8d8706e2 | 655 | return; |
1da177e4 LT |
656 | } |
657 |