2 * HIL MLC state machine and serio interface driver
4 * Copyright (c) 2001 Brian S. Julin
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
16 * Alternatively, this software may be distributed under the terms of the
17 * GNU General Public License ("GPL").
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
30 * HP-HIL Technical Reference Manual. Hewlett Packard Product No. 45918A
33 * Driver theory of operation:
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.
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.)
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.
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/list.h>
64 MODULE_AUTHOR("Brian S. Julin <bri@calyx.com>");
65 MODULE_DESCRIPTION("HIL MLC serio");
66 MODULE_LICENSE("Dual BSD/GPL");
68 EXPORT_SYMBOL(hil_mlc_register);
69 EXPORT_SYMBOL(hil_mlc_unregister);
71 #define PREFIX "HIL MLC: "
73 static LIST_HEAD(hil_mlcs);
74 static DEFINE_RWLOCK(hil_mlcs_lock);
75 static struct timer_list hil_mlcs_kicker;
76 static int hil_mlcs_probe;
78 static void hil_mlcs_process(unsigned long unused);
79 DECLARE_TASKLET_DISABLED(hil_mlcs_tasklet, hil_mlcs_process, 0);
82 /* #define HIL_MLC_DEBUG */
84 /********************** Device info/instance management **********************/
86 static void hil_mlc_clear_di_map (hil_mlc *mlc, int val) {
88 for (j = val; j < 7 ; j++) {
93 static void hil_mlc_clear_di_scratch (hil_mlc *mlc) {
94 memset(&(mlc->di_scratch), 0, sizeof(mlc->di_scratch));
97 static void hil_mlc_copy_di_scratch (hil_mlc *mlc, int idx) {
98 memcpy(&(mlc->di[idx]), &(mlc->di_scratch), sizeof(mlc->di_scratch));
101 static int hil_mlc_match_di_scratch (hil_mlc *mlc) {
104 for (idx = 0; idx < HIL_MLC_DEVMEM; idx++) {
107 /* In-use slots are not eligible. */
109 for (j = 0; j < 7 ; j++) {
110 if (mlc->di_map[j] == idx) found++;
113 if (!memcmp(mlc->di + idx,
115 sizeof(mlc->di_scratch))) break;
117 return((idx >= HIL_MLC_DEVMEM) ? -1 : idx);
120 static int hil_mlc_find_free_di(hil_mlc *mlc) {
122 /* TODO: Pick all-zero slots first, failing that,
123 * randomize the slot picked among those eligible.
125 for (idx = 0; idx < HIL_MLC_DEVMEM; idx++) {
128 for (j = 0; j < 7 ; j++) {
129 if (mlc->di_map[j] == idx) found++;
133 return(idx); /* Note: It is guaranteed at least one above will match */
136 static inline void hil_mlc_clean_serio_map(hil_mlc *mlc) {
138 for (idx = 0; idx < HIL_MLC_DEVMEM; idx++) {
141 for (j = 0; j < 7 ; j++) {
142 if (mlc->di_map[j] == idx) found++;
144 if (!found) mlc->serio_map[idx].di_revmap = -1;
148 static void hil_mlc_send_polls(hil_mlc *mlc) {
151 struct serio_driver *drv;
154 did = (mlc->ipacket[0] & HIL_PKT_ADDR_MASK) >> 8;
155 serio = did ? mlc->serio[mlc->di_map[did - 1]] : NULL;
156 drv = (serio != NULL) ? serio->drv : NULL;
158 while (mlc->icount < 15 - i) {
161 if (did != (p & HIL_PKT_ADDR_MASK) >> 8) {
162 if (drv == NULL || drv->interrupt == NULL) goto skip;
164 drv->interrupt(serio, 0, 0);
165 drv->interrupt(serio, HIL_ERR_INT >> 16, 0);
166 drv->interrupt(serio, HIL_PKT_CMD >> 8, 0);
167 drv->interrupt(serio, HIL_CMD_POL + cnt, 0);
169 did = (p & HIL_PKT_ADDR_MASK) >> 8;
170 serio = did ? mlc->serio[mlc->di_map[did-1]] : NULL;
171 drv = (serio != NULL) ? serio->drv : NULL;
175 if (drv == NULL || drv->interrupt == NULL) continue;
176 drv->interrupt(serio, (p >> 24), 0);
177 drv->interrupt(serio, (p >> 16) & 0xff, 0);
178 drv->interrupt(serio, (p >> 8) & ~HIL_PKT_ADDR_MASK, 0);
179 drv->interrupt(serio, p & 0xff, 0);
183 /*************************** State engine *********************************/
185 #define HILSEN_SCHED 0x000100 /* Schedule the tasklet */
186 #define HILSEN_BREAK 0x000200 /* Wait until next pass */
187 #define HILSEN_UP 0x000400 /* relative node#, decrement */
188 #define HILSEN_DOWN 0x000800 /* relative node#, increment */
189 #define HILSEN_FOLLOW 0x001000 /* use retval as next node# */
191 #define HILSEN_MASK 0x0000ff
192 #define HILSEN_START 0
193 #define HILSEN_RESTART 1
195 #define HILSEN_DHR2 10
196 #define HILSEN_IFC 14
197 #define HILSEN_HEAL0 16
198 #define HILSEN_HEAL 18
199 #define HILSEN_ACF 21
200 #define HILSEN_ACF2 22
201 #define HILSEN_DISC0 25
202 #define HILSEN_DISC 27
203 #define HILSEN_MATCH 40
204 #define HILSEN_OPERATE 41
205 #define HILSEN_PROBE 44
206 #define HILSEN_DSR 52
207 #define HILSEN_REPOLL 55
208 #define HILSEN_IFCACF 58
209 #define HILSEN_END 60
211 #define HILSEN_NEXT (HILSEN_DOWN | 1)
212 #define HILSEN_SAME (HILSEN_DOWN | 0)
213 #define HILSEN_LAST (HILSEN_UP | 1)
215 #define HILSEN_DOZE (HILSEN_SAME | HILSEN_SCHED | HILSEN_BREAK)
216 #define HILSEN_SLEEP (HILSEN_SAME | HILSEN_BREAK)
218 static int hilse_match(hil_mlc *mlc, int unused) {
220 rc = hil_mlc_match_di_scratch(mlc);
222 rc = hil_mlc_find_free_di(mlc);
223 if (rc == -1) goto err;
225 printk(KERN_DEBUG PREFIX "new in slot %i\n", rc);
227 hil_mlc_copy_di_scratch(mlc, rc);
228 mlc->di_map[mlc->ddi] = rc;
229 mlc->serio_map[rc].di_revmap = mlc->ddi;
230 hil_mlc_clean_serio_map(mlc);
231 serio_rescan(mlc->serio[rc]);
234 mlc->di_map[mlc->ddi] = rc;
236 printk(KERN_DEBUG PREFIX "same in slot %i\n", rc);
238 mlc->serio_map[rc].di_revmap = mlc->ddi;
239 hil_mlc_clean_serio_map(mlc);
242 printk(KERN_ERR PREFIX "Residual device slots exhausted, close some serios!\n");
246 /* An LCV used to prevent runaway loops, forces 5 second sleep when reset. */
247 static int hilse_init_lcv(hil_mlc *mlc, int unused) {
250 do_gettimeofday(&tv);
252 if(mlc->lcv == 0) goto restart; /* First init, no need to dally */
253 if(tv.tv_sec - mlc->lcv_tv.tv_sec < 5) return -1;
260 static int hilse_inc_lcv(hil_mlc *mlc, int lim) {
261 if (mlc->lcv++ >= lim) return -1;
266 static int hilse_set_lcv(hil_mlc *mlc, int val) {
272 /* Management of the discovered device index (zero based, -1 means no devs) */
273 static int hilse_set_ddi(hil_mlc *mlc, int val) {
275 hil_mlc_clear_di_map(mlc, val + 1);
279 static int hilse_dec_ddi(hil_mlc *mlc, int unused) {
281 if (mlc->ddi <= -1) {
283 hil_mlc_clear_di_map(mlc, 0);
286 hil_mlc_clear_di_map(mlc, mlc->ddi + 1);
290 static int hilse_inc_ddi(hil_mlc *mlc, int unused) {
299 static int hilse_take_idd(hil_mlc *mlc, int unused) {
302 /* Help the state engine:
303 * Is this a real IDD response or just an echo?
305 * Real IDD response does not start with a command.
307 if (mlc->ipacket[0] & HIL_PKT_CMD) goto bail;
308 /* Should have the command echoed further down. */
309 for (i = 1; i < 16; i++) {
310 if (((mlc->ipacket[i] & HIL_PKT_ADDR_MASK) ==
311 (mlc->ipacket[0] & HIL_PKT_ADDR_MASK)) &&
312 (mlc->ipacket[i] & HIL_PKT_CMD) &&
313 ((mlc->ipacket[i] & HIL_PKT_DATA_MASK) == HIL_CMD_IDD))
316 if (i > 15) goto bail;
317 /* And the rest of the packets should still be clear. */
319 if (mlc->ipacket[i]) break;
321 if (i < 16) goto bail;
322 for (i = 0; i < 16; i++) {
323 mlc->di_scratch.idd[i] =
324 mlc->ipacket[i] & HIL_PKT_DATA_MASK;
326 /* Next step is to see if RSC supported */
327 if (mlc->di_scratch.idd[1] & HIL_IDD_HEADER_RSC)
329 if (mlc->di_scratch.idd[1] & HIL_IDD_HEADER_EXD)
330 return HILSEN_DOWN | 4;
334 return -1; /* This should send us off to ACF */
337 static int hilse_take_rsc(hil_mlc *mlc, int unused) {
340 for (i = 0; i < 16; i++) {
341 mlc->di_scratch.rsc[i] =
342 mlc->ipacket[i] & HIL_PKT_DATA_MASK;
344 /* Next step is to see if EXD supported (IDD has already been read) */
345 if (mlc->di_scratch.idd[1] & HIL_IDD_HEADER_EXD)
350 static int hilse_take_exd(hil_mlc *mlc, int unused) {
353 for (i = 0; i < 16; i++) {
354 mlc->di_scratch.exd[i] =
355 mlc->ipacket[i] & HIL_PKT_DATA_MASK;
357 /* Next step is to see if RNM supported. */
358 if (mlc->di_scratch.exd[0] & HIL_EXD_HEADER_RNM)
363 static int hilse_take_rnm(hil_mlc *mlc, int unused) {
366 for (i = 0; i < 16; i++) {
367 mlc->di_scratch.rnm[i] =
368 mlc->ipacket[i] & HIL_PKT_DATA_MASK;
372 snprintf(nam, 16, "%s", mlc->di_scratch.rnm);
374 printk(KERN_INFO PREFIX "Device name gotten: %s\n", nam);
379 static int hilse_operate(hil_mlc *mlc, int repoll) {
381 if (mlc->opercnt == 0) hil_mlcs_probe = 0;
384 hil_mlc_send_polls(mlc);
386 if (!hil_mlcs_probe) return 0;
392 #define FUNC(funct, funct_arg, zero_rc, neg_rc, pos_rc) \
393 { HILSE_FUNC, { .func = funct }, funct_arg, zero_rc, neg_rc, pos_rc },
395 { HILSE_OUT, { .packet = pack }, 0, HILSEN_NEXT, HILSEN_DOZE, 0 },
397 { HILSE_CTS, { .packet = 0 }, 0, HILSEN_NEXT | HILSEN_SCHED | HILSEN_BREAK, HILSEN_DOZE, 0 },
398 #define EXPECT(comp, to, got, got_wrong, timed_out) \
399 { HILSE_EXPECT, { .packet = comp }, to, got, got_wrong, timed_out },
400 #define EXPECT_LAST(comp, to, got, got_wrong, timed_out) \
401 { HILSE_EXPECT_LAST, { .packet = comp }, to, got, got_wrong, timed_out },
402 #define EXPECT_DISC(comp, to, got, got_wrong, timed_out) \
403 { HILSE_EXPECT_DISC, { .packet = comp }, to, got, got_wrong, timed_out },
404 #define IN(to, got, got_error, timed_out) \
405 { HILSE_IN, { .packet = 0 }, to, got, got_error, timed_out },
406 #define OUT_DISC(pack) \
407 { HILSE_OUT_DISC, { .packet = pack }, 0, 0, 0, 0 },
408 #define OUT_LAST(pack) \
409 { HILSE_OUT_LAST, { .packet = pack }, 0, 0, 0, 0 },
411 struct hilse_node hil_mlc_se[HILSEN_END] = {
414 FUNC(hilse_init_lcv, 0, HILSEN_NEXT, HILSEN_SLEEP, 0)
416 /* 1 HILSEN_RESTART */
417 FUNC(hilse_inc_lcv, 10, HILSEN_NEXT, HILSEN_START, 0)
418 OUT(HIL_CTRL_ONLY) /* Disable APE */
421 #define TEST_PACKET(x) \
422 (HIL_PKT_CMD | (x << HIL_PKT_ADDR_SHIFT) | x << 4 | x)
424 OUT(HIL_DO_ALTER_CTRL | HIL_CTRL_TEST | TEST_PACKET(0x5))
425 EXPECT(HIL_ERR_INT | TEST_PACKET(0x5),
426 2000, HILSEN_NEXT, HILSEN_RESTART, HILSEN_RESTART)
427 OUT(HIL_DO_ALTER_CTRL | HIL_CTRL_TEST | TEST_PACKET(0xa))
428 EXPECT(HIL_ERR_INT | TEST_PACKET(0xa),
429 2000, HILSEN_NEXT, HILSEN_RESTART, HILSEN_RESTART)
430 OUT(HIL_CTRL_ONLY | 0) /* Disable test mode */
433 FUNC(hilse_init_lcv, 0, HILSEN_NEXT, HILSEN_SLEEP, 0)
436 FUNC(hilse_inc_lcv, 10, HILSEN_NEXT, HILSEN_START, 0)
437 FUNC(hilse_set_ddi, -1, HILSEN_NEXT, 0, 0)
438 OUT(HIL_PKT_CMD | HIL_CMD_DHR)
439 IN(300000, HILSEN_DHR2, HILSEN_DHR2, HILSEN_NEXT)
442 OUT(HIL_PKT_CMD | HIL_CMD_IFC)
443 EXPECT(HIL_PKT_CMD | HIL_CMD_IFC | HIL_ERR_INT,
444 20000, HILSEN_DISC, HILSEN_DHR2, HILSEN_NEXT )
446 /* If devices are there, they weren't in PUP or other loopback mode.
447 * We're more concerned at this point with restoring operation
448 * to devices than discovering new ones, so we try to salvage
449 * the loop configuration by closing off the loop.
452 /* 16 HILSEN_HEAL0 */
453 FUNC(hilse_dec_ddi, 0, HILSEN_NEXT, HILSEN_ACF, 0)
454 FUNC(hilse_inc_ddi, 0, HILSEN_NEXT, 0, 0)
457 OUT_LAST(HIL_CMD_ELB)
458 EXPECT_LAST(HIL_CMD_ELB | HIL_ERR_INT,
459 20000, HILSEN_REPOLL, HILSEN_DSR, HILSEN_NEXT)
460 FUNC(hilse_dec_ddi, 0, HILSEN_HEAL, HILSEN_NEXT, 0)
463 FUNC(hilse_init_lcv, 0, HILSEN_NEXT, HILSEN_DOZE, 0)
466 FUNC(hilse_inc_lcv, 10, HILSEN_NEXT, HILSEN_START, 0)
467 OUT(HIL_PKT_CMD | HIL_CMD_ACF | 1)
468 IN(20000, HILSEN_NEXT, HILSEN_DSR, HILSEN_NEXT)
470 /* 25 HILSEN_DISC0 */
471 OUT_DISC(HIL_PKT_CMD | HIL_CMD_ELB)
472 EXPECT_DISC(HIL_PKT_CMD | HIL_CMD_ELB | HIL_ERR_INT,
473 20000, HILSEN_NEXT, HILSEN_DSR, HILSEN_DSR)
475 /* Only enter here if response just received */
477 OUT_DISC(HIL_PKT_CMD | HIL_CMD_IDD)
478 EXPECT_DISC(HIL_PKT_CMD | HIL_CMD_IDD | HIL_ERR_INT,
479 20000, HILSEN_NEXT, HILSEN_DSR, HILSEN_START)
480 FUNC(hilse_inc_ddi, 0, HILSEN_NEXT, HILSEN_START, 0)
481 FUNC(hilse_take_idd, 0, HILSEN_MATCH, HILSEN_IFCACF, HILSEN_FOLLOW)
482 OUT_LAST(HIL_PKT_CMD | HIL_CMD_RSC)
483 EXPECT_LAST(HIL_PKT_CMD | HIL_CMD_RSC | HIL_ERR_INT,
484 30000, HILSEN_NEXT, HILSEN_DSR, HILSEN_DSR)
485 FUNC(hilse_take_rsc, 0, HILSEN_MATCH, 0, HILSEN_FOLLOW)
486 OUT_LAST(HIL_PKT_CMD | HIL_CMD_EXD)
487 EXPECT_LAST(HIL_PKT_CMD | HIL_CMD_EXD | HIL_ERR_INT,
488 30000, HILSEN_NEXT, HILSEN_DSR, HILSEN_DSR)
489 FUNC(hilse_take_exd, 0, HILSEN_MATCH, 0, HILSEN_FOLLOW)
490 OUT_LAST(HIL_PKT_CMD | HIL_CMD_RNM)
491 EXPECT_LAST(HIL_PKT_CMD | HIL_CMD_RNM | HIL_ERR_INT,
492 30000, HILSEN_NEXT, HILSEN_DSR, HILSEN_DSR)
493 FUNC(hilse_take_rnm, 0, HILSEN_MATCH, 0, 0)
495 /* 40 HILSEN_MATCH */
496 FUNC(hilse_match, 0, HILSEN_NEXT, HILSEN_NEXT, /* TODO */ 0)
498 /* 41 HILSEN_OPERATE */
499 OUT(HIL_PKT_CMD | HIL_CMD_POL)
500 EXPECT(HIL_PKT_CMD | HIL_CMD_POL | HIL_ERR_INT,
501 20000, HILSEN_NEXT, HILSEN_DSR, HILSEN_NEXT)
502 FUNC(hilse_operate, 0, HILSEN_OPERATE, HILSEN_IFC, HILSEN_NEXT)
504 /* 44 HILSEN_PROBE */
505 OUT_LAST(HIL_PKT_CMD | HIL_CMD_EPT)
506 IN(10000, HILSEN_DISC, HILSEN_DSR, HILSEN_NEXT)
507 OUT_DISC(HIL_PKT_CMD | HIL_CMD_ELB)
508 IN(10000, HILSEN_DISC, HILSEN_DSR, HILSEN_NEXT)
509 OUT(HIL_PKT_CMD | HIL_CMD_ACF | 1)
510 IN(10000, HILSEN_DISC0, HILSEN_DSR, HILSEN_NEXT)
511 OUT_LAST(HIL_PKT_CMD | HIL_CMD_ELB)
512 IN(10000, HILSEN_OPERATE, HILSEN_DSR, HILSEN_DSR)
515 FUNC(hilse_set_ddi, -1, HILSEN_NEXT, 0, 0)
516 OUT(HIL_PKT_CMD | HIL_CMD_DSR)
517 IN(20000, HILSEN_DHR, HILSEN_DHR, HILSEN_IFC)
519 /* 55 HILSEN_REPOLL */
520 OUT(HIL_PKT_CMD | HIL_CMD_RPL)
521 EXPECT(HIL_PKT_CMD | HIL_CMD_RPL | HIL_ERR_INT,
522 20000, HILSEN_NEXT, HILSEN_DSR, HILSEN_NEXT)
523 FUNC(hilse_operate, 1, HILSEN_OPERATE, HILSEN_IFC, HILSEN_PROBE)
525 /* 58 HILSEN_IFCACF */
526 OUT(HIL_PKT_CMD | HIL_CMD_IFC)
527 EXPECT(HIL_PKT_CMD | HIL_CMD_IFC | HIL_ERR_INT,
528 20000, HILSEN_ACF2, HILSEN_DHR2, HILSEN_HEAL)
533 static inline void hilse_setup_input(hil_mlc *mlc, struct hilse_node *node) {
536 case HILSE_EXPECT_DISC:
537 mlc->imatch = node->object.packet;
538 mlc->imatch |= ((mlc->ddi + 2) << HIL_PKT_ADDR_SHIFT);
540 case HILSE_EXPECT_LAST:
541 mlc->imatch = node->object.packet;
542 mlc->imatch |= ((mlc->ddi + 1) << HIL_PKT_ADDR_SHIFT);
545 mlc->imatch = node->object.packet;
554 mlc->intimeout = node->arg;
555 do_gettimeofday(&(mlc->instart));
557 memset(mlc->ipacket, 0, 16 * sizeof(hil_packet));
558 BUG_ON(down_trylock(&(mlc->isem)));
565 static int seidx; /* For debug */
569 static int hilse_donode (hil_mlc *mlc) {
570 struct hilse_node *node;
576 if (mlc->seidx && (mlc->seidx != seidx) && mlc->seidx != 41 && mlc->seidx != 42 && mlc->seidx != 43) {
577 printk(KERN_DEBUG PREFIX "z%i \n%s {%i}", doze, kick ? "K" : "", mlc->seidx);
584 node = hil_mlc_se + mlc->seidx;
591 if (node->object.func == NULL) break;
592 rc = node->object.func(mlc, node->arg);
593 nextidx = (rc > 0) ? node->ugly :
594 ((rc < 0) ? node->bad : node->good);
595 if (nextidx == HILSEN_FOLLOW) nextidx = rc;
597 case HILSE_EXPECT_LAST:
598 case HILSE_EXPECT_DISC:
601 /* Already set up from previous HILSE_OUT_* */
602 write_lock_irqsave(&(mlc->lock), flags);
603 rc = mlc->in(mlc, node->arg);
605 nextidx = HILSEN_DOZE;
607 write_unlock_irqrestore(&(mlc->lock), flags);
610 if (rc == 1) nextidx = node->ugly;
611 else if (rc == 0) nextidx = node->good;
612 else nextidx = node->bad;
614 write_unlock_irqrestore(&(mlc->lock), flags);
617 write_lock_irqsave(&(mlc->lock), flags);
618 pack = node->object.packet;
619 pack |= ((mlc->ddi + 1) << HIL_PKT_ADDR_SHIFT);
622 write_lock_irqsave(&(mlc->lock), flags);
623 pack = node->object.packet;
624 pack |= ((mlc->ddi + 2) << HIL_PKT_ADDR_SHIFT);
627 write_lock_irqsave(&(mlc->lock), flags);
628 pack = node->object.packet;
630 if (mlc->istarted) goto out2;
631 /* Prepare to receive input */
632 if ((node + 1)->act & HILSE_IN)
633 hilse_setup_input(mlc, node + 1);
636 write_unlock_irqrestore(&(mlc->lock), flags);
638 if (down_trylock(&mlc->osem)) {
639 nextidx = HILSEN_DOZE;
644 write_lock_irqsave(&(mlc->lock), flags);
645 if (!(mlc->ostarted)) {
649 nextidx = HILSEN_DOZE;
650 write_unlock_irqrestore(&(mlc->lock), flags);
654 do_gettimeofday(&(mlc->instart));
655 write_unlock_irqrestore(&(mlc->lock), flags);
656 nextidx = HILSEN_NEXT;
659 nextidx = mlc->cts(mlc) ? node->bad : node->good;
668 if (nextidx == HILSEN_DOZE) doze++;
671 while (nextidx & HILSEN_SCHED) {
674 if (!sched_long) goto sched;
676 do_gettimeofday(&tv);
677 tv.tv_usec += 1000000 * (tv.tv_sec - mlc->instart.tv_sec);
678 tv.tv_usec -= mlc->instart.tv_usec;
679 if (tv.tv_usec >= mlc->intimeout) goto sched;
680 tv.tv_usec = (mlc->intimeout - tv.tv_usec) * HZ / 1000000;
681 if (!tv.tv_usec) goto sched;
682 mod_timer(&hil_mlcs_kicker, jiffies + tv.tv_usec);
685 tasklet_schedule(&hil_mlcs_tasklet);
688 if (nextidx & HILSEN_DOWN) mlc->seidx += nextidx & HILSEN_MASK;
689 else if (nextidx & HILSEN_UP) mlc->seidx -= nextidx & HILSEN_MASK;
690 else mlc->seidx = nextidx & HILSEN_MASK;
692 if (nextidx & HILSEN_BREAK) return 1;
696 /******************** tasklet context functions **************************/
697 static void hil_mlcs_process(unsigned long unused) {
698 struct list_head *tmp;
700 read_lock(&hil_mlcs_lock);
701 list_for_each(tmp, &hil_mlcs) {
702 struct hil_mlc *mlc = list_entry(tmp, hil_mlc, list);
703 while (hilse_donode(mlc) == 0) {
705 if (mlc->seidx != 41 &&
708 printk(KERN_DEBUG PREFIX " + ");
712 read_unlock(&hil_mlcs_lock);
715 /************************* Keepalive timer task *********************/
717 void hil_mlcs_timer (unsigned long data) {
719 tasklet_schedule(&hil_mlcs_tasklet);
720 /* Re-insert the periodic task. */
721 if (!timer_pending(&hil_mlcs_kicker))
722 mod_timer(&hil_mlcs_kicker, jiffies + HZ);
725 /******************** user/kernel context functions **********************/
727 static int hil_mlc_serio_write(struct serio *serio, unsigned char c) {
728 struct hil_mlc_serio_map *map;
730 struct serio_driver *drv;
733 map = serio->port_data;
743 mlc->serio_opacket[map->didx] |=
744 ((hil_packet)c) << (8 * (3 - mlc->serio_oidx[map->didx]));
746 if (mlc->serio_oidx[map->didx] >= 3) {
747 /* for now only commands */
748 if (!(mlc->serio_opacket[map->didx] & HIL_PKT_CMD))
750 switch (mlc->serio_opacket[map->didx] & HIL_PKT_DATA_MASK) {
752 idx = mlc->di[map->didx].idd;
755 idx = mlc->di[map->didx].rsc;
758 idx = mlc->di[map->didx].exd;
761 idx = mlc->di[map->didx].rnm;
766 mlc->serio_oidx[map->didx] = 0;
767 mlc->serio_opacket[map->didx] = 0;
770 mlc->serio_oidx[map->didx]++;
779 while ((last != idx) && (*last == 0)) last--;
781 while (idx != last) {
782 drv->interrupt(serio, 0, 0);
783 drv->interrupt(serio, HIL_ERR_INT >> 16, 0);
784 drv->interrupt(serio, 0, 0);
785 drv->interrupt(serio, *idx, 0);
788 drv->interrupt(serio, 0, 0);
789 drv->interrupt(serio, HIL_ERR_INT >> 16, 0);
790 drv->interrupt(serio, HIL_PKT_CMD >> 8, 0);
791 drv->interrupt(serio, *idx, 0);
793 mlc->serio_oidx[map->didx] = 0;
794 mlc->serio_opacket[map->didx] = 0;
799 static int hil_mlc_serio_open(struct serio *serio) {
800 struct hil_mlc_serio_map *map;
803 if (serio_get_drvdata(serio) != NULL)
806 map = serio->port_data;
820 static void hil_mlc_serio_close(struct serio *serio) {
821 struct hil_mlc_serio_map *map;
824 map = serio->port_data;
835 serio_set_drvdata(serio, NULL);
837 /* TODO wake up interruptable */
840 static struct serio_device_id hil_mlc_serio_id = {
841 .type = SERIO_HIL_MLC,
847 int hil_mlc_register(hil_mlc *mlc) {
858 rwlock_init(&mlc->lock);
859 init_MUTEX(&(mlc->osem));
861 init_MUTEX(&(mlc->isem));
867 init_MUTEX_LOCKED(&(mlc->csem));
869 hil_mlc_clear_di_scratch(mlc);
870 hil_mlc_clear_di_map(mlc, 0);
871 for (i = 0; i < HIL_MLC_DEVMEM; i++) {
872 struct serio *mlc_serio;
873 hil_mlc_copy_di_scratch(mlc, i);
874 mlc_serio = kzalloc(sizeof(*mlc_serio), GFP_KERNEL);
875 mlc->serio[i] = mlc_serio;
876 mlc_serio->id = hil_mlc_serio_id;
877 mlc_serio->write = hil_mlc_serio_write;
878 mlc_serio->open = hil_mlc_serio_open;
879 mlc_serio->close = hil_mlc_serio_close;
880 mlc_serio->port_data = &(mlc->serio_map[i]);
881 mlc->serio_map[i].mlc = mlc;
882 mlc->serio_map[i].didx = i;
883 mlc->serio_map[i].di_revmap = -1;
884 mlc->serio_opacket[i] = 0;
885 mlc->serio_oidx[i] = 0;
886 serio_register_port(mlc_serio);
889 mlc->tasklet = &hil_mlcs_tasklet;
891 write_lock_irqsave(&hil_mlcs_lock, flags);
892 list_add_tail(&mlc->list, &hil_mlcs);
893 mlc->seidx = HILSEN_START;
894 write_unlock_irqrestore(&hil_mlcs_lock, flags);
896 tasklet_schedule(&hil_mlcs_tasklet);
900 int hil_mlc_unregister(hil_mlc *mlc) {
901 struct list_head *tmp;
908 write_lock_irqsave(&hil_mlcs_lock, flags);
909 list_for_each(tmp, &hil_mlcs) {
910 if (list_entry(tmp, hil_mlc, list) == mlc)
914 /* not found in list */
915 write_unlock_irqrestore(&hil_mlcs_lock, flags);
916 tasklet_schedule(&hil_mlcs_tasklet);
921 write_unlock_irqrestore(&hil_mlcs_lock, flags);
923 for (i = 0; i < HIL_MLC_DEVMEM; i++) {
924 serio_unregister_port(mlc->serio[i]);
925 mlc->serio[i] = NULL;
928 tasklet_schedule(&hil_mlcs_tasklet);
932 /**************************** Module interface *************************/
934 static int __init hil_mlc_init(void)
936 init_timer(&hil_mlcs_kicker);
937 hil_mlcs_kicker.expires = jiffies + HZ;
938 hil_mlcs_kicker.function = &hil_mlcs_timer;
939 add_timer(&hil_mlcs_kicker);
941 tasklet_enable(&hil_mlcs_tasklet);
946 static void __exit hil_mlc_exit(void)
948 del_timer(&hil_mlcs_kicker);
950 tasklet_disable(&hil_mlcs_tasklet);
951 tasklet_kill(&hil_mlcs_tasklet);
954 module_init(hil_mlc_init);
955 module_exit(hil_mlc_exit);