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Linux-2.6.12-rc2
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / input / serio / hil_mlc.c
blobc243cb6fdfc4a72f56d188b5e59a62314cede3af
1 /*
2 * HIL MLC state machine and serio interface driver
3 *
4 * Copyright (c) 2001 Brian S. Julin
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions, and the following disclaimer,
12 * without modification.
13 * 2. The name of the author may not be used to endorse or promote products
14 * derived from this software without specific prior written permission.
15 *
16 * Alternatively, this software may be distributed under the terms of the
17 * GNU General Public License ("GPL").
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
23 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 *
29 * References:
30 * HP-HIL Technical Reference Manual. Hewlett Packard Product No. 45918A
31 *
32 *
33 * Driver theory of operation:
34 *
35 * Some access methods and an ISR is defined by the sub-driver
36 * (e.g. hp_sdc_mlc.c). These methods are expected to provide a
37 * few bits of logic in addition to raw access to the HIL MLC,
38 * specifically, the ISR, which is entirely registered by the
39 * sub-driver and invoked directly, must check for record
40 * termination or packet match, at which point a semaphore must
41 * be cleared and then the hil_mlcs_tasklet must be scheduled.
42 *
43 * The hil_mlcs_tasklet processes the state machine for all MLCs
44 * each time it runs, checking each MLC's progress at the current
45 * node in the state machine, and moving the MLC to subsequent nodes
46 * in the state machine when appropriate. It will reschedule
47 * itself if output is pending. (This rescheduling should be replaced
48 * at some point with a sub-driver-specific mechanism.)
49 *
50 * A timer task prods the tasklet once per second to prevent
51 * hangups when attached devices do not return expected data
52 * and to initiate probes of the loop for new devices.
53 */
54
55 #include <linux/hil_mlc.h>
56 #include <linux/errno.h>
57 #include <linux/kernel.h>
58 #include <linux/module.h>
59 #include <linux/init.h>
60 #include <linux/interrupt.h>
61 #include <linux/timer.h>
62 #include <linux/sched.h>
63 #include <linux/list.h>
64
65 MODULE_AUTHOR("Brian S. Julin <bri@calyx.com>");
66 MODULE_DESCRIPTION("HIL MLC serio");
67 MODULE_LICENSE("Dual BSD/GPL");
68
69 EXPORT_SYMBOL(hil_mlc_register);
70 EXPORT_SYMBOL(hil_mlc_unregister);
71
72 #define PREFIX "HIL MLC: "
73
74 static LIST_HEAD(hil_mlcs);
75 static DEFINE_RWLOCK(hil_mlcs_lock);
76 static struct timer_list hil_mlcs_kicker;
77 static int hil_mlcs_probe;
78
79 static void hil_mlcs_process(unsigned long unused);
80 DECLARE_TASKLET_DISABLED(hil_mlcs_tasklet, hil_mlcs_process, 0);
81
82
83 /* #define HIL_MLC_DEBUG */
84
85 /********************** Device info/instance management **********************/
86
87 static void hil_mlc_clear_di_map (hil_mlc *mlc, int val) {
88 int j;
89 for (j = val; j < 7 ; j++) {
90 mlc->di_map[j] = -1;
91 }
92 }
93
94 static void hil_mlc_clear_di_scratch (hil_mlc *mlc) {
95 memset(&(mlc->di_scratch), 0, sizeof(mlc->di_scratch));
96 }
97
98 static void hil_mlc_copy_di_scratch (hil_mlc *mlc, int idx) {
99 memcpy(&(mlc->di[idx]), &(mlc->di_scratch), sizeof(mlc->di_scratch));
100 }
101
102 static int hil_mlc_match_di_scratch (hil_mlc *mlc) {
103 int idx;
104
105 for (idx = 0; idx < HIL_MLC_DEVMEM; idx++) {
106 int j, found;
107
108 /* In-use slots are not eligible. */
109 found = 0;
110 for (j = 0; j < 7 ; j++) {
111 if (mlc->di_map[j] == idx) found++;
112 }
113 if (found) continue;
114 if (!memcmp(mlc->di + idx,
115 &(mlc->di_scratch),
116 sizeof(mlc->di_scratch))) break;
117 }
118 return((idx >= HIL_MLC_DEVMEM) ? -1 : idx);
119 }
120
121 static int hil_mlc_find_free_di(hil_mlc *mlc) {
122 int idx;
123 /* TODO: Pick all-zero slots first, failing that,
124 * randomize the slot picked among those eligible.
125 */
126 for (idx = 0; idx < HIL_MLC_DEVMEM; idx++) {
127 int j, found;
128 found = 0;
129 for (j = 0; j < 7 ; j++) {
130 if (mlc->di_map[j] == idx) found++;
131 }
132 if (!found) break;
133 }
134 return(idx); /* Note: It is guaranteed at least one above will match */
135 }
136
137 static inline void hil_mlc_clean_serio_map(hil_mlc *mlc) {
138 int idx;
139 for (idx = 0; idx < HIL_MLC_DEVMEM; idx++) {
140 int j, found;
141 found = 0;
142 for (j = 0; j < 7 ; j++) {
143 if (mlc->di_map[j] == idx) found++;
144 }
145 if (!found) mlc->serio_map[idx].di_revmap = -1;
146 }
147 }
148
149 static void hil_mlc_send_polls(hil_mlc *mlc) {
150 int did, i, cnt;
151 struct serio *serio;
152 struct serio_driver *drv;
153
154 i = cnt = 0;
155 did = (mlc->ipacket[0] & HIL_PKT_ADDR_MASK) >> 8;
156 serio = did ? mlc->serio[mlc->di_map[did - 1]] : NULL;
157 drv = (serio != NULL) ? serio->drv : NULL;
158
159 while (mlc->icount < 15 - i) {
160 hil_packet p;
161 p = mlc->ipacket[i];
162 if (did != (p & HIL_PKT_ADDR_MASK) >> 8) {
163 if (drv == NULL || drv->interrupt == NULL) goto skip;
164
165 drv->interrupt(serio, 0, 0, NULL);
166 drv->interrupt(serio, HIL_ERR_INT >> 16, 0, NULL);
167 drv->interrupt(serio, HIL_PKT_CMD >> 8, 0, NULL);
168 drv->interrupt(serio, HIL_CMD_POL + cnt, 0, NULL);
169 skip:
170 did = (p & HIL_PKT_ADDR_MASK) >> 8;
171 serio = did ? mlc->serio[mlc->di_map[did-1]] : NULL;
172 drv = (serio != NULL) ? serio->drv : NULL;
173 cnt = 0;
174 }
175 cnt++; i++;
176 if (drv == NULL || drv->interrupt == NULL) continue;
177 drv->interrupt(serio, (p >> 24), 0, NULL);
178 drv->interrupt(serio, (p >> 16) & 0xff, 0, NULL);
179 drv->interrupt(serio, (p >> 8) & ~HIL_PKT_ADDR_MASK, 0, NULL);
180 drv->interrupt(serio, p & 0xff, 0, NULL);
181 }
182 }
183
184 /*************************** State engine *********************************/
185
186 #define HILSEN_SCHED 0x000100 /* Schedule the tasklet */
187 #define HILSEN_BREAK 0x000200 /* Wait until next pass */
188 #define HILSEN_UP 0x000400 /* relative node#, decrement */
189 #define HILSEN_DOWN 0x000800 /* relative node#, increment */
190 #define HILSEN_FOLLOW 0x001000 /* use retval as next node# */
191
192 #define HILSEN_MASK 0x0000ff
193 #define HILSEN_START 0
194 #define HILSEN_RESTART 1
195 #define HILSEN_DHR 9
196 #define HILSEN_DHR2 10
197 #define HILSEN_IFC 14
198 #define HILSEN_HEAL0 16
199 #define HILSEN_HEAL 18
200 #define HILSEN_ACF 21
201 #define HILSEN_ACF2 22
202 #define HILSEN_DISC0 25
203 #define HILSEN_DISC 27
204 #define HILSEN_MATCH 40
205 #define HILSEN_OPERATE 41
206 #define HILSEN_PROBE 44
207 #define HILSEN_DSR 52
208 #define HILSEN_REPOLL 55
209 #define HILSEN_IFCACF 58
210 #define HILSEN_END 60
211
212 #define HILSEN_NEXT (HILSEN_DOWN | 1)
213 #define HILSEN_SAME (HILSEN_DOWN | 0)
214 #define HILSEN_LAST (HILSEN_UP | 1)
215
216 #define HILSEN_DOZE (HILSEN_SAME | HILSEN_SCHED | HILSEN_BREAK)
217 #define HILSEN_SLEEP (HILSEN_SAME | HILSEN_BREAK)
218
219 static int hilse_match(hil_mlc *mlc, int unused) {
220 int rc;
221 rc = hil_mlc_match_di_scratch(mlc);
222 if (rc == -1) {
223 rc = hil_mlc_find_free_di(mlc);
224 if (rc == -1) goto err;
225 #ifdef HIL_MLC_DEBUG
226 printk(KERN_DEBUG PREFIX "new in slot %i\n", rc);
227 #endif
228 hil_mlc_copy_di_scratch(mlc, rc);
229 mlc->di_map[mlc->ddi] = rc;
230 mlc->serio_map[rc].di_revmap = mlc->ddi;
231 hil_mlc_clean_serio_map(mlc);
232 serio_rescan(mlc->serio[rc]);
233 return -1;
234 }
235 mlc->di_map[mlc->ddi] = rc;
236 #ifdef HIL_MLC_DEBUG
237 printk(KERN_DEBUG PREFIX "same in slot %i\n", rc);
238 #endif
239 mlc->serio_map[rc].di_revmap = mlc->ddi;
240 hil_mlc_clean_serio_map(mlc);
241 return 0;
242 err:
243 printk(KERN_ERR PREFIX "Residual device slots exhausted, close some serios!\n");
244 return 1;
245 }
246
247 /* An LCV used to prevent runaway loops, forces 5 second sleep when reset. */
248 static int hilse_init_lcv(hil_mlc *mlc, int unused) {
249 struct timeval tv;
250
251 do_gettimeofday(&tv);
252
253 if(mlc->lcv == 0) goto restart; /* First init, no need to dally */
254 if(tv.tv_sec - mlc->lcv_tv.tv_sec < 5) return -1;
255 restart:
256 mlc->lcv_tv = tv;
257 mlc->lcv = 0;
258 return 0;
259 }
260
261 static int hilse_inc_lcv(hil_mlc *mlc, int lim) {
262 if (mlc->lcv++ >= lim) return -1;
263 return 0;
264 }
265
266 #if 0
267 static int hilse_set_lcv(hil_mlc *mlc, int val) {
268 mlc->lcv = val;
269 return 0;
270 }
271 #endif
272
273 /* Management of the discovered device index (zero based, -1 means no devs) */
274 static int hilse_set_ddi(hil_mlc *mlc, int val) {
275 mlc->ddi = val;
276 hil_mlc_clear_di_map(mlc, val + 1);
277 return 0;
278 }
279
280 static int hilse_dec_ddi(hil_mlc *mlc, int unused) {
281 mlc->ddi--;
282 if (mlc->ddi <= -1) {
283 mlc->ddi = -1;
284 hil_mlc_clear_di_map(mlc, 0);
285 return -1;
286 }
287 hil_mlc_clear_di_map(mlc, mlc->ddi + 1);
288 return 0;
289 }
290
291 static int hilse_inc_ddi(hil_mlc *mlc, int unused) {
292 if (mlc->ddi >= 6) {
293 BUG();
294 return -1;
295 }
296 mlc->ddi++;
297 return 0;
298 }
299
300 static int hilse_take_idd(hil_mlc *mlc, int unused) {
301 int i;
302
303 /* Help the state engine:
304 * Is this a real IDD response or just an echo?
305 *
306 * Real IDD response does not start with a command.
307 */
308 if (mlc->ipacket[0] & HIL_PKT_CMD) goto bail;
309 /* Should have the command echoed further down. */
310 for (i = 1; i < 16; i++) {
311 if (((mlc->ipacket[i] & HIL_PKT_ADDR_MASK) ==
312 (mlc->ipacket[0] & HIL_PKT_ADDR_MASK)) &&
313 (mlc->ipacket[i] & HIL_PKT_CMD) &&
314 ((mlc->ipacket[i] & HIL_PKT_DATA_MASK) == HIL_CMD_IDD))
315 break;
316 }
317 if (i > 15) goto bail;
318 /* And the rest of the packets should still be clear. */
319 while (++i < 16) {
320 if (mlc->ipacket[i]) break;
321 }
322 if (i < 16) goto bail;
323 for (i = 0; i < 16; i++) {
324 mlc->di_scratch.idd[i] =
325 mlc->ipacket[i] & HIL_PKT_DATA_MASK;
326 }
327 /* Next step is to see if RSC supported */
328 if (mlc->di_scratch.idd[1] & HIL_IDD_HEADER_RSC)
329 return HILSEN_NEXT;
330 if (mlc->di_scratch.idd[1] & HIL_IDD_HEADER_EXD)
331 return HILSEN_DOWN | 4;
332 return 0;
333 bail:
334 mlc->ddi--;
335 return -1; /* This should send us off to ACF */
336 }
337
338 static int hilse_take_rsc(hil_mlc *mlc, int unused) {
339 int i;
340
341 for (i = 0; i < 16; i++) {
342 mlc->di_scratch.rsc[i] =
343 mlc->ipacket[i] & HIL_PKT_DATA_MASK;
344 }
345 /* Next step is to see if EXD supported (IDD has already been read) */
346 if (mlc->di_scratch.idd[1] & HIL_IDD_HEADER_EXD)
347 return HILSEN_NEXT;
348 return 0;
349 }
350
351 static int hilse_take_exd(hil_mlc *mlc, int unused) {
352 int i;
353
354 for (i = 0; i < 16; i++) {
355 mlc->di_scratch.exd[i] =
356 mlc->ipacket[i] & HIL_PKT_DATA_MASK;
357 }
358 /* Next step is to see if RNM supported. */
359 if (mlc->di_scratch.exd[0] & HIL_EXD_HEADER_RNM)
360 return HILSEN_NEXT;
361 return 0;
362 }
363
364 static int hilse_take_rnm(hil_mlc *mlc, int unused) {
365 int i;
366
367 for (i = 0; i < 16; i++) {
368 mlc->di_scratch.rnm[i] =
369 mlc->ipacket[i] & HIL_PKT_DATA_MASK;
370 }
371 do {
372 char nam[17];
373 snprintf(nam, 16, "%s", mlc->di_scratch.rnm);
374 nam[16] = '\0';
375 printk(KERN_INFO PREFIX "Device name gotten: %s\n", nam);
376 } while (0);
377 return 0;
378 }
379
380 static int hilse_operate(hil_mlc *mlc, int repoll) {
381
382 if (mlc->opercnt == 0) hil_mlcs_probe = 0;
383 mlc->opercnt = 1;
384
385 hil_mlc_send_polls(mlc);
386
387 if (!hil_mlcs_probe) return 0;
388 hil_mlcs_probe = 0;
389 mlc->opercnt = 0;
390 return 1;
391 }
392
393 #define FUNC(funct, funct_arg, zero_rc, neg_rc, pos_rc) \
394 { HILSE_FUNC, { func: &funct }, funct_arg, zero_rc, neg_rc, pos_rc },
395 #define OUT(pack) \
396 { HILSE_OUT, { packet: pack }, 0, HILSEN_NEXT, HILSEN_DOZE, 0 },
397 #define CTS \
398 { HILSE_CTS, { packet: 0 }, 0, HILSEN_NEXT | HILSEN_SCHED | HILSEN_BREAK, HILSEN_DOZE, 0 },
399 #define EXPECT(comp, to, got, got_wrong, timed_out) \
400 { HILSE_EXPECT, { packet: comp }, to, got, got_wrong, timed_out },
401 #define EXPECT_LAST(comp, to, got, got_wrong, timed_out) \
402 { HILSE_EXPECT_LAST, { packet: comp }, to, got, got_wrong, timed_out },
403 #define EXPECT_DISC(comp, to, got, got_wrong, timed_out) \
404 { HILSE_EXPECT_DISC, { packet: comp }, to, got, got_wrong, timed_out },
405 #define IN(to, got, got_error, timed_out) \
406 { HILSE_IN, { packet: 0 }, to, got, got_error, timed_out },
407 #define OUT_DISC(pack) \
408 { HILSE_OUT_DISC, { packet: pack }, 0, 0, 0, 0 },
409 #define OUT_LAST(pack) \
410 { HILSE_OUT_LAST, { packet: pack }, 0, 0, 0, 0 },
411
412 struct hilse_node hil_mlc_se[HILSEN_END] = {
413
414 /* 0 HILSEN_START */
415 FUNC(hilse_init_lcv, 0, HILSEN_NEXT, HILSEN_SLEEP, 0)
416
417 /* 1 HILSEN_RESTART */
418 FUNC(hilse_inc_lcv, 10, HILSEN_NEXT, HILSEN_START, 0)
419 OUT(HIL_CTRL_ONLY) /* Disable APE */
420 CTS
421
422 #define TEST_PACKET(x) \
423 (HIL_PKT_CMD | (x << HIL_PKT_ADDR_SHIFT) | x << 4 | x)
424
425 OUT(HIL_DO_ALTER_CTRL | HIL_CTRL_TEST | TEST_PACKET(0x5))
426 EXPECT(HIL_ERR_INT | TEST_PACKET(0x5),
427 2000, HILSEN_NEXT, HILSEN_RESTART, HILSEN_RESTART)
428 OUT(HIL_DO_ALTER_CTRL | HIL_CTRL_TEST | TEST_PACKET(0xa))
429 EXPECT(HIL_ERR_INT | TEST_PACKET(0xa),
430 2000, HILSEN_NEXT, HILSEN_RESTART, HILSEN_RESTART)
431 OUT(HIL_CTRL_ONLY | 0) /* Disable test mode */
432
433 /* 9 HILSEN_DHR */
434 FUNC(hilse_init_lcv, 0, HILSEN_NEXT, HILSEN_SLEEP, 0)
435
436 /* 10 HILSEN_DHR2 */
437 FUNC(hilse_inc_lcv, 10, HILSEN_NEXT, HILSEN_START, 0)
438 FUNC(hilse_set_ddi, -1, HILSEN_NEXT, 0, 0)
439 OUT(HIL_PKT_CMD | HIL_CMD_DHR)
440 IN(300000, HILSEN_DHR2, HILSEN_DHR2, HILSEN_NEXT)
441
442 /* 14 HILSEN_IFC */
443 OUT(HIL_PKT_CMD | HIL_CMD_IFC)
444 EXPECT(HIL_PKT_CMD | HIL_CMD_IFC | HIL_ERR_INT,
445 20000, HILSEN_DISC, HILSEN_DHR2, HILSEN_NEXT )
446
447 /* If devices are there, they weren't in PUP or other loopback mode.
448 * We're more concerned at this point with restoring operation
449 * to devices than discovering new ones, so we try to salvage
450 * the loop configuration by closing off the loop.
451 */
452
453 /* 16 HILSEN_HEAL0 */
454 FUNC(hilse_dec_ddi, 0, HILSEN_NEXT, HILSEN_ACF, 0)
455 FUNC(hilse_inc_ddi, 0, HILSEN_NEXT, 0, 0)
456
457 /* 18 HILSEN_HEAL */
458 OUT_LAST(HIL_CMD_ELB)
459 EXPECT_LAST(HIL_CMD_ELB | HIL_ERR_INT,
460 20000, HILSEN_REPOLL, HILSEN_DSR, HILSEN_NEXT)
461 FUNC(hilse_dec_ddi, 0, HILSEN_HEAL, HILSEN_NEXT, 0)
462
463 /* 21 HILSEN_ACF */
464 FUNC(hilse_init_lcv, 0, HILSEN_NEXT, HILSEN_DOZE, 0)
465
466 /* 22 HILSEN_ACF2 */
467 FUNC(hilse_inc_lcv, 10, HILSEN_NEXT, HILSEN_START, 0)
468 OUT(HIL_PKT_CMD | HIL_CMD_ACF | 1)
469 IN(20000, HILSEN_NEXT, HILSEN_DSR, HILSEN_NEXT)
470
471 /* 25 HILSEN_DISC0 */
472 OUT_DISC(HIL_PKT_CMD | HIL_CMD_ELB)
473 EXPECT_DISC(HIL_PKT_CMD | HIL_CMD_ELB | HIL_ERR_INT,
474 20000, HILSEN_NEXT, HILSEN_DSR, HILSEN_DSR)
475
476 /* Only enter here if response just received */
477 /* 27 HILSEN_DISC */
478 OUT_DISC(HIL_PKT_CMD | HIL_CMD_IDD)
479 EXPECT_DISC(HIL_PKT_CMD | HIL_CMD_IDD | HIL_ERR_INT,
480 20000, HILSEN_NEXT, HILSEN_DSR, HILSEN_START)
481 FUNC(hilse_inc_ddi, 0, HILSEN_NEXT, HILSEN_START, 0)
482 FUNC(hilse_take_idd, 0, HILSEN_MATCH, HILSEN_IFCACF, HILSEN_FOLLOW)
483 OUT_LAST(HIL_PKT_CMD | HIL_CMD_RSC)
484 EXPECT_LAST(HIL_PKT_CMD | HIL_CMD_RSC | HIL_ERR_INT,
485 30000, HILSEN_NEXT, HILSEN_DSR, HILSEN_DSR)
486 FUNC(hilse_take_rsc, 0, HILSEN_MATCH, 0, HILSEN_FOLLOW)
487 OUT_LAST(HIL_PKT_CMD | HIL_CMD_EXD)
488 EXPECT_LAST(HIL_PKT_CMD | HIL_CMD_EXD | HIL_ERR_INT,
489 30000, HILSEN_NEXT, HILSEN_DSR, HILSEN_DSR)
490 FUNC(hilse_take_exd, 0, HILSEN_MATCH, 0, HILSEN_FOLLOW)
491 OUT_LAST(HIL_PKT_CMD | HIL_CMD_RNM)
492 EXPECT_LAST(HIL_PKT_CMD | HIL_CMD_RNM | HIL_ERR_INT,
493 30000, HILSEN_NEXT, HILSEN_DSR, HILSEN_DSR)
494 FUNC(hilse_take_rnm, 0, HILSEN_MATCH, 0, 0)
495
496 /* 40 HILSEN_MATCH */
497 FUNC(hilse_match, 0, HILSEN_NEXT, HILSEN_NEXT, /* TODO */ 0)
498
499 /* 41 HILSEN_OPERATE */
500 OUT(HIL_PKT_CMD | HIL_CMD_POL)
501 EXPECT(HIL_PKT_CMD | HIL_CMD_POL | HIL_ERR_INT,
502 20000, HILSEN_NEXT, HILSEN_DSR, HILSEN_NEXT)
503 FUNC(hilse_operate, 0, HILSEN_OPERATE, HILSEN_IFC, HILSEN_NEXT)
504
505 /* 44 HILSEN_PROBE */
506 OUT_LAST(HIL_PKT_CMD | HIL_CMD_EPT)
507 IN(10000, HILSEN_DISC, HILSEN_DSR, HILSEN_NEXT)
508 OUT_DISC(HIL_PKT_CMD | HIL_CMD_ELB)
509 IN(10000, HILSEN_DISC, HILSEN_DSR, HILSEN_NEXT)
510 OUT(HIL_PKT_CMD | HIL_CMD_ACF | 1)
511 IN(10000, HILSEN_DISC0, HILSEN_DSR, HILSEN_NEXT)
512 OUT_LAST(HIL_PKT_CMD | HIL_CMD_ELB)
513 IN(10000, HILSEN_OPERATE, HILSEN_DSR, HILSEN_DSR)
514
515 /* 52 HILSEN_DSR */
516 FUNC(hilse_set_ddi, -1, HILSEN_NEXT, 0, 0)
517 OUT(HIL_PKT_CMD | HIL_CMD_DSR)
518 IN(20000, HILSEN_DHR, HILSEN_DHR, HILSEN_IFC)
519
520 /* 55 HILSEN_REPOLL */
521 OUT(HIL_PKT_CMD | HIL_CMD_RPL)
522 EXPECT(HIL_PKT_CMD | HIL_CMD_RPL | HIL_ERR_INT,
523 20000, HILSEN_NEXT, HILSEN_DSR, HILSEN_NEXT)
524 FUNC(hilse_operate, 1, HILSEN_OPERATE, HILSEN_IFC, HILSEN_PROBE)
525
526 /* 58 HILSEN_IFCACF */
527 OUT(HIL_PKT_CMD | HIL_CMD_IFC)
528 EXPECT(HIL_PKT_CMD | HIL_CMD_IFC | HIL_ERR_INT,
529 20000, HILSEN_ACF2, HILSEN_DHR2, HILSEN_HEAL)
530
531 /* 60 HILSEN_END */
532 };
533
534 static inline void hilse_setup_input(hil_mlc *mlc, struct hilse_node *node) {
535
536 switch (node->act) {
537 case HILSE_EXPECT_DISC:
538 mlc->imatch = node->object.packet;
539 mlc->imatch |= ((mlc->ddi + 2) << HIL_PKT_ADDR_SHIFT);
540 break;
541 case HILSE_EXPECT_LAST:
542 mlc->imatch = node->object.packet;
543 mlc->imatch |= ((mlc->ddi + 1) << HIL_PKT_ADDR_SHIFT);
544 break;
545 case HILSE_EXPECT:
546 mlc->imatch = node->object.packet;
547 break;
548 case HILSE_IN:
549 mlc->imatch = 0;
550 break;
551 default:
552 BUG();
553 }
554 mlc->istarted = 1;
555 mlc->intimeout = node->arg;
556 do_gettimeofday(&(mlc->instart));
557 mlc->icount = 15;
558 memset(mlc->ipacket, 0, 16 * sizeof(hil_packet));
559 if (down_trylock(&(mlc->isem))) BUG();
560
561 return;
562 }
563
564 #ifdef HIL_MLC_DEBUG
565 static int doze = 0;
566 static int seidx; /* For debug */
567 static int kick = 1;
568 #endif
569
570 static int hilse_donode (hil_mlc *mlc) {
571 struct hilse_node *node;
572 int nextidx = 0;
573 int sched_long = 0;
574 unsigned long flags;
575
576 #ifdef HIL_MLC_DEBUG
577 if (mlc->seidx && (mlc->seidx != seidx) && mlc->seidx != 41 && mlc->seidx != 42 && mlc->seidx != 43) {
578 printk(KERN_DEBUG PREFIX "z%i \n%s {%i}", doze, kick ? "K" : "", mlc->seidx);
579 doze = 0;
580 }
581 kick = 0;
582
583 seidx = mlc->seidx;
584 #endif
585 node = hil_mlc_se + mlc->seidx;
586
587 switch (node->act) {
588 int rc;
589 hil_packet pack;
590
591 case HILSE_FUNC:
592 if (node->object.func == NULL) break;
593 rc = node->object.func(mlc, node->arg);
594 nextidx = (rc > 0) ? node->ugly :
595 ((rc < 0) ? node->bad : node->good);
596 if (nextidx == HILSEN_FOLLOW) nextidx = rc;
597 break;
598 case HILSE_EXPECT_LAST:
599 case HILSE_EXPECT_DISC:
600 case HILSE_EXPECT:
601 case HILSE_IN:
602 /* Already set up from previous HILSE_OUT_* */
603 write_lock_irqsave(&(mlc->lock), flags);
604 rc = mlc->in(mlc, node->arg);
605 if (rc == 2) {
606 nextidx = HILSEN_DOZE;
607 sched_long = 1;
608 write_unlock_irqrestore(&(mlc->lock), flags);
609 break;
610 }
611 if (rc == 1) nextidx = node->ugly;
612 else if (rc == 0) nextidx = node->good;
613 else nextidx = node->bad;
614 mlc->istarted = 0;
615 write_unlock_irqrestore(&(mlc->lock), flags);
616 break;
617 case HILSE_OUT_LAST:
618 write_lock_irqsave(&(mlc->lock), flags);
619 pack = node->object.packet;
620 pack |= ((mlc->ddi + 1) << HIL_PKT_ADDR_SHIFT);
621 goto out;
622 case HILSE_OUT_DISC:
623 write_lock_irqsave(&(mlc->lock), flags);
624 pack = node->object.packet;
625 pack |= ((mlc->ddi + 2) << HIL_PKT_ADDR_SHIFT);
626 goto out;
627 case HILSE_OUT:
628 write_lock_irqsave(&(mlc->lock), flags);
629 pack = node->object.packet;
630 out:
631 if (mlc->istarted) goto out2;
632 /* Prepare to receive input */
633 if ((node + 1)->act & HILSE_IN)
634 hilse_setup_input(mlc, node + 1);
635
636 out2:
637 write_unlock_irqrestore(&(mlc->lock), flags);
638
639 if (down_trylock(&mlc->osem)) {
640 nextidx = HILSEN_DOZE;
641 break;
642 }
643 up(&mlc->osem);
644
645 write_lock_irqsave(&(mlc->lock), flags);
646 if (!(mlc->ostarted)) {
647 mlc->ostarted = 1;
648 mlc->opacket = pack;
649 mlc->out(mlc);
650 nextidx = HILSEN_DOZE;
651 write_unlock_irqrestore(&(mlc->lock), flags);
652 break;
653 }
654 mlc->ostarted = 0;
655 do_gettimeofday(&(mlc->instart));
656 write_unlock_irqrestore(&(mlc->lock), flags);
657 nextidx = HILSEN_NEXT;
658 break;
659 case HILSE_CTS:
660 nextidx = mlc->cts(mlc) ? node->bad : node->good;
661 break;
662 default:
663 BUG();
664 nextidx = 0;
665 break;
666 }
667
668 #ifdef HIL_MLC_DEBUG
669 if (nextidx == HILSEN_DOZE) doze++;
670 #endif
671
672 while (nextidx & HILSEN_SCHED) {
673 struct timeval tv;
674
675 if (!sched_long) goto sched;
676
677 do_gettimeofday(&tv);
678 tv.tv_usec += 1000000 * (tv.tv_sec - mlc->instart.tv_sec);
679 tv.tv_usec -= mlc->instart.tv_usec;
680 if (tv.tv_usec >= mlc->intimeout) goto sched;
681 tv.tv_usec = (mlc->intimeout - tv.tv_usec) * HZ / 1000000;
682 if (!tv.tv_usec) goto sched;
683 mod_timer(&hil_mlcs_kicker, jiffies + tv.tv_usec);
684 break;
685 sched:
686 tasklet_schedule(&hil_mlcs_tasklet);
687 break;
688 }
689 if (nextidx & HILSEN_DOWN) mlc->seidx += nextidx & HILSEN_MASK;
690 else if (nextidx & HILSEN_UP) mlc->seidx -= nextidx & HILSEN_MASK;
691 else mlc->seidx = nextidx & HILSEN_MASK;
692
693 if (nextidx & HILSEN_BREAK) return 1;
694 return 0;
695 }
696
697 /******************** tasklet context functions **************************/
698 static void hil_mlcs_process(unsigned long unused) {
699 struct list_head *tmp;
700
701 read_lock(&hil_mlcs_lock);
702 list_for_each(tmp, &hil_mlcs) {
703 struct hil_mlc *mlc = list_entry(tmp, hil_mlc, list);
704 while (hilse_donode(mlc) == 0) {
705 #ifdef HIL_MLC_DEBUG
706 if (mlc->seidx != 41 &&
707 mlc->seidx != 42 &&
708 mlc->seidx != 43)
709 printk(KERN_DEBUG PREFIX " + ");
710 #endif
711 };
712 }
713 read_unlock(&hil_mlcs_lock);
714 }
715
716 /************************* Keepalive timer task *********************/
717
718 void hil_mlcs_timer (unsigned long data) {
719 hil_mlcs_probe = 1;
720 tasklet_schedule(&hil_mlcs_tasklet);
721 /* Re-insert the periodic task. */
722 if (!timer_pending(&hil_mlcs_kicker))
723 mod_timer(&hil_mlcs_kicker, jiffies + HZ);
724 }
725
726 /******************** user/kernel context functions **********************/
727
728 static int hil_mlc_serio_write(struct serio *serio, unsigned char c) {
729 struct hil_mlc_serio_map *map;
730 struct hil_mlc *mlc;
731 struct serio_driver *drv;
732 uint8_t *idx, *last;
733
734 map = serio->port_data;
735 if (map == NULL) {
736 BUG();
737 return -EIO;
738 }
739 mlc = map->mlc;
740 if (mlc == NULL) {
741 BUG();
742 return -EIO;
743 }
744 mlc->serio_opacket[map->didx] |=
745 ((hil_packet)c) << (8 * (3 - mlc->serio_oidx[map->didx]));
746
747 if (mlc->serio_oidx[map->didx] >= 3) {
748 /* for now only commands */
749 if (!(mlc->serio_opacket[map->didx] & HIL_PKT_CMD))
750 return -EIO;
751 switch (mlc->serio_opacket[map->didx] & HIL_PKT_DATA_MASK) {
752 case HIL_CMD_IDD:
753 idx = mlc->di[map->didx].idd;
754 goto emu;
755 case HIL_CMD_RSC:
756 idx = mlc->di[map->didx].rsc;
757 goto emu;
758 case HIL_CMD_EXD:
759 idx = mlc->di[map->didx].exd;
760 goto emu;
761 case HIL_CMD_RNM:
762 idx = mlc->di[map->didx].rnm;
763 goto emu;
764 default:
765 break;
766 }
767 mlc->serio_oidx[map->didx] = 0;
768 mlc->serio_opacket[map->didx] = 0;
769 }
770
771 mlc->serio_oidx[map->didx]++;
772 return -EIO;
773 emu:
774 drv = serio->drv;
775 if (drv == NULL) {
776 BUG();
777 return -EIO;
778 }
779 last = idx + 15;
780 while ((last != idx) && (*last == 0)) last--;
781
782 while (idx != last) {
783 drv->interrupt(serio, 0, 0, NULL);
784 drv->interrupt(serio, HIL_ERR_INT >> 16, 0, NULL);
785 drv->interrupt(serio, 0, 0, NULL);
786 drv->interrupt(serio, *idx, 0, NULL);
787 idx++;
788 }
789 drv->interrupt(serio, 0, 0, NULL);
790 drv->interrupt(serio, HIL_ERR_INT >> 16, 0, NULL);
791 drv->interrupt(serio, HIL_PKT_CMD >> 8, 0, NULL);
792 drv->interrupt(serio, *idx, 0, NULL);
793
794 mlc->serio_oidx[map->didx] = 0;
795 mlc->serio_opacket[map->didx] = 0;
796
797 return 0;
798 }
799
800 static int hil_mlc_serio_open(struct serio *serio) {
801 struct hil_mlc_serio_map *map;
802 struct hil_mlc *mlc;
803
804 if (serio->private != NULL) return -EBUSY;
805
806 map = serio->port_data;
807 if (map == NULL) {
808 BUG();
809 return -ENODEV;
810 }
811 mlc = map->mlc;
812 if (mlc == NULL) {
813 BUG();
814 return -ENODEV;
815 }
816
817 return 0;
818 }
819
820 static void hil_mlc_serio_close(struct serio *serio) {
821 struct hil_mlc_serio_map *map;
822 struct hil_mlc *mlc;
823
824 map = serio->port_data;
825 if (map == NULL) {
826 BUG();
827 return;
828 }
829 mlc = map->mlc;
830 if (mlc == NULL) {
831 BUG();
832 return;
833 }
834
835 serio->private = NULL;
836 serio->drv = NULL;
837 /* TODO wake up interruptable */
838 }
839
840 int hil_mlc_register(hil_mlc *mlc) {
841 int i;
842 unsigned long flags;
843
844 if (mlc == NULL) {
845 return -EINVAL;
846 }
847
848 mlc->istarted = 0;
849 mlc->ostarted = 0;
850
851 rwlock_init(&mlc->lock);
852 init_MUTEX(&(mlc->osem));
853
854 init_MUTEX(&(mlc->isem));
855 mlc->icount = -1;
856 mlc->imatch = 0;
857
858 mlc->opercnt = 0;
859
860 init_MUTEX_LOCKED(&(mlc->csem));
861
862 hil_mlc_clear_di_scratch(mlc);
863 hil_mlc_clear_di_map(mlc, 0);
864 for (i = 0; i < HIL_MLC_DEVMEM; i++) {
865 struct serio *mlc_serio;
866 hil_mlc_copy_di_scratch(mlc, i);
867 mlc_serio = kmalloc(sizeof(*mlc_serio), GFP_KERNEL);
868 mlc->serio[i] = mlc_serio;
869 memset(mlc_serio, 0, sizeof(*mlc_serio));
870 mlc_serio->type = SERIO_HIL | SERIO_HIL_MLC;
871 mlc_serio->write = hil_mlc_serio_write;
872 mlc_serio->open = hil_mlc_serio_open;
873 mlc_serio->close = hil_mlc_serio_close;
874 mlc_serio->port_data = &(mlc->serio_map[i]);
875 mlc->serio_map[i].mlc = mlc;
876 mlc->serio_map[i].didx = i;
877 mlc->serio_map[i].di_revmap = -1;
878 mlc->serio_opacket[i] = 0;
879 mlc->serio_oidx[i] = 0;
880 serio_register_port(mlc_serio);
881 }
882
883 mlc->tasklet = &hil_mlcs_tasklet;
884
885 write_lock_irqsave(&hil_mlcs_lock, flags);
886 list_add_tail(&mlc->list, &hil_mlcs);
887 mlc->seidx = HILSEN_START;
888 write_unlock_irqrestore(&hil_mlcs_lock, flags);
889
890 tasklet_schedule(&hil_mlcs_tasklet);
891 return 0;
892 }
893
894 int hil_mlc_unregister(hil_mlc *mlc) {
895 struct list_head *tmp;
896 unsigned long flags;
897 int i;
898
899 if (mlc == NULL)
900 return -EINVAL;
901
902 write_lock_irqsave(&hil_mlcs_lock, flags);
903 list_for_each(tmp, &hil_mlcs) {
904 if (list_entry(tmp, hil_mlc, list) == mlc)
905 goto found;
906 }
907
908 /* not found in list */
909 write_unlock_irqrestore(&hil_mlcs_lock, flags);
910 tasklet_schedule(&hil_mlcs_tasklet);
911 return -ENODEV;
912
913 found:
914 list_del(tmp);
915 write_unlock_irqrestore(&hil_mlcs_lock, flags);
916
917 for (i = 0; i < HIL_MLC_DEVMEM; i++) {
918 serio_unregister_port(mlc->serio[i]);
919 mlc->serio[i] = NULL;
920 }
921
922 tasklet_schedule(&hil_mlcs_tasklet);
923 return 0;
924 }
925
926 /**************************** Module interface *************************/
927
928 static int __init hil_mlc_init(void)
929 {
930 init_timer(&hil_mlcs_kicker);
931 hil_mlcs_kicker.expires = jiffies + HZ;
932 hil_mlcs_kicker.function = &hil_mlcs_timer;
933 add_timer(&hil_mlcs_kicker);
934
935 tasklet_enable(&hil_mlcs_tasklet);
936
937 return 0;
938 }
939
940 static void __exit hil_mlc_exit(void)
941 {
942 del_timer(&hil_mlcs_kicker);
943
944 tasklet_disable(&hil_mlcs_tasklet);
945 tasklet_kill(&hil_mlcs_tasklet);
946 }
947
948 module_init(hil_mlc_init);
949 module_exit(hil_mlc_exit);
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