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/sched.h>
63 #include <linux/list.h>
65 MODULE_AUTHOR("Brian S. Julin <bri@calyx.com>");
66 MODULE_DESCRIPTION("HIL MLC serio");
67 MODULE_LICENSE("Dual BSD/GPL");
69 EXPORT_SYMBOL(hil_mlc_register);
70 EXPORT_SYMBOL(hil_mlc_unregister);
72 #define PREFIX "HIL MLC: "
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;
79 static void hil_mlcs_process(unsigned long unused);
80 DECLARE_TASKLET_DISABLED(hil_mlcs_tasklet, hil_mlcs_process, 0);
83 /* #define HIL_MLC_DEBUG */
85 /********************** Device info/instance management **********************/
87 static void hil_mlc_clear_di_map (hil_mlc *mlc, int val) {
89 for (j = val; j < 7 ; j++) {
94 static void hil_mlc_clear_di_scratch (hil_mlc *mlc) {
95 memset(&(mlc->di_scratch), 0, sizeof(mlc->di_scratch));
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));
102 static int hil_mlc_match_di_scratch (hil_mlc *mlc) {
105 for (idx = 0; idx < HIL_MLC_DEVMEM; idx++) {
108 /* In-use slots are not eligible. */
110 for (j = 0; j < 7 ; j++) {
111 if (mlc->di_map[j] == idx) found++;
114 if (!memcmp(mlc->di + idx,
116 sizeof(mlc->di_scratch))) break;
118 return((idx >= HIL_MLC_DEVMEM) ? -1 : idx);
121 static int hil_mlc_find_free_di(hil_mlc *mlc) {
123 /* TODO: Pick all-zero slots first, failing that,
124 * randomize the slot picked among those eligible.
126 for (idx = 0; idx < HIL_MLC_DEVMEM; idx++) {
129 for (j = 0; j < 7 ; j++) {
130 if (mlc->di_map[j] == idx) found++;
134 return(idx); /* Note: It is guaranteed at least one above will match */
137 static inline void hil_mlc_clean_serio_map(hil_mlc *mlc) {
139 for (idx = 0; idx < HIL_MLC_DEVMEM; idx++) {
142 for (j = 0; j < 7 ; j++) {
143 if (mlc->di_map[j] == idx) found++;
145 if (!found) mlc->serio_map[idx].di_revmap = -1;
149 static void hil_mlc_send_polls(hil_mlc *mlc) {
152 struct serio_driver *drv;
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;
159 while (mlc->icount < 15 - i) {
162 if (did != (p & HIL_PKT_ADDR_MASK) >> 8) {
163 if (drv == NULL || drv->interrupt == NULL) goto skip;
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);
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;
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);
184 /*************************** State engine *********************************/
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# */
192 #define HILSEN_MASK 0x0000ff
193 #define HILSEN_START 0
194 #define HILSEN_RESTART 1
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
212 #define HILSEN_NEXT (HILSEN_DOWN | 1)
213 #define HILSEN_SAME (HILSEN_DOWN | 0)
214 #define HILSEN_LAST (HILSEN_UP | 1)
216 #define HILSEN_DOZE (HILSEN_SAME | HILSEN_SCHED | HILSEN_BREAK)
217 #define HILSEN_SLEEP (HILSEN_SAME | HILSEN_BREAK)
219 static int hilse_match(hil_mlc *mlc, int unused) {
221 rc = hil_mlc_match_di_scratch(mlc);
223 rc = hil_mlc_find_free_di(mlc);
224 if (rc == -1) goto err;
226 printk(KERN_DEBUG PREFIX "new in slot %i\n", rc);
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]);
235 mlc->di_map[mlc->ddi] = rc;
237 printk(KERN_DEBUG PREFIX "same in slot %i\n", rc);
239 mlc->serio_map[rc].di_revmap = mlc->ddi;
240 hil_mlc_clean_serio_map(mlc);
243 printk(KERN_ERR PREFIX "Residual device slots exhausted, close some serios!\n");
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) {
251 do_gettimeofday(&tv);
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;
261 static int hilse_inc_lcv(hil_mlc *mlc, int lim) {
262 if (mlc->lcv++ >= lim) return -1;
267 static int hilse_set_lcv(hil_mlc *mlc, int val) {
273 /* Management of the discovered device index (zero based, -1 means no devs) */
274 static int hilse_set_ddi(hil_mlc *mlc, int val) {
276 hil_mlc_clear_di_map(mlc, val + 1);
280 static int hilse_dec_ddi(hil_mlc *mlc, int unused) {
282 if (mlc->ddi <= -1) {
284 hil_mlc_clear_di_map(mlc, 0);
287 hil_mlc_clear_di_map(mlc, mlc->ddi + 1);
291 static int hilse_inc_ddi(hil_mlc *mlc, int unused) {
300 static int hilse_take_idd(hil_mlc *mlc, int unused) {
303 /* Help the state engine:
304 * Is this a real IDD response or just an echo?
306 * Real IDD response does not start with a command.
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))
317 if (i > 15) goto bail;
318 /* And the rest of the packets should still be clear. */
320 if (mlc->ipacket[i]) break;
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;
327 /* Next step is to see if RSC supported */
328 if (mlc->di_scratch.idd[1] & HIL_IDD_HEADER_RSC)
330 if (mlc->di_scratch.idd[1] & HIL_IDD_HEADER_EXD)
331 return HILSEN_DOWN | 4;
335 return -1; /* This should send us off to ACF */
338 static int hilse_take_rsc(hil_mlc *mlc, int unused) {
341 for (i = 0; i < 16; i++) {
342 mlc->di_scratch.rsc[i] =
343 mlc->ipacket[i] & HIL_PKT_DATA_MASK;
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)
351 static int hilse_take_exd(hil_mlc *mlc, int unused) {
354 for (i = 0; i < 16; i++) {
355 mlc->di_scratch.exd[i] =
356 mlc->ipacket[i] & HIL_PKT_DATA_MASK;
358 /* Next step is to see if RNM supported. */
359 if (mlc->di_scratch.exd[0] & HIL_EXD_HEADER_RNM)
364 static int hilse_take_rnm(hil_mlc *mlc, int unused) {
367 for (i = 0; i < 16; i++) {
368 mlc->di_scratch.rnm[i] =
369 mlc->ipacket[i] & HIL_PKT_DATA_MASK;
373 snprintf(nam, 16, "%s", mlc->di_scratch.rnm);
375 printk(KERN_INFO PREFIX "Device name gotten: %s\n", nam);
380 static int hilse_operate(hil_mlc *mlc, int repoll) {
382 if (mlc->opercnt == 0) hil_mlcs_probe = 0;
385 hil_mlc_send_polls(mlc);
387 if (!hil_mlcs_probe) return 0;
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 },
396 { HILSE_OUT, { packet: pack }, 0, HILSEN_NEXT, HILSEN_DOZE, 0 },
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 },
412 struct hilse_node hil_mlc_se[HILSEN_END] = {
415 FUNC(hilse_init_lcv, 0, HILSEN_NEXT, HILSEN_SLEEP, 0)
417 /* 1 HILSEN_RESTART */
418 FUNC(hilse_inc_lcv, 10, HILSEN_NEXT, HILSEN_START, 0)
419 OUT(HIL_CTRL_ONLY) /* Disable APE */
422 #define TEST_PACKET(x) \
423 (HIL_PKT_CMD | (x << HIL_PKT_ADDR_SHIFT) | x << 4 | x)
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 */
434 FUNC(hilse_init_lcv, 0, HILSEN_NEXT, HILSEN_SLEEP, 0)
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)
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 )
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.
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)
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)
464 FUNC(hilse_init_lcv, 0, HILSEN_NEXT, HILSEN_DOZE, 0)
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)
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)
476 /* Only enter here if response just received */
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)
496 /* 40 HILSEN_MATCH */
497 FUNC(hilse_match, 0, HILSEN_NEXT, HILSEN_NEXT, /* TODO */ 0)
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)
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)
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)
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)
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)
534 static inline void hilse_setup_input(hil_mlc *mlc, struct hilse_node *node) {
537 case HILSE_EXPECT_DISC:
538 mlc->imatch = node->object.packet;
539 mlc->imatch |= ((mlc->ddi + 2) << HIL_PKT_ADDR_SHIFT);
541 case HILSE_EXPECT_LAST:
542 mlc->imatch = node->object.packet;
543 mlc->imatch |= ((mlc->ddi + 1) << HIL_PKT_ADDR_SHIFT);
546 mlc->imatch = node->object.packet;
555 mlc->intimeout = node->arg;
556 do_gettimeofday(&(mlc->instart));
558 memset(mlc->ipacket, 0, 16 * sizeof(hil_packet));
559 BUG_ON(down_trylock(&(mlc->isem)));
566 static int seidx; /* For debug */
570 static int hilse_donode (hil_mlc *mlc) {
571 struct hilse_node *node;
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);
585 node = hil_mlc_se + mlc->seidx;
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;
598 case HILSE_EXPECT_LAST:
599 case HILSE_EXPECT_DISC:
602 /* Already set up from previous HILSE_OUT_* */
603 write_lock_irqsave(&(mlc->lock), flags);
604 rc = mlc->in(mlc, node->arg);
606 nextidx = HILSEN_DOZE;
608 write_unlock_irqrestore(&(mlc->lock), flags);
611 if (rc == 1) nextidx = node->ugly;
612 else if (rc == 0) nextidx = node->good;
613 else nextidx = node->bad;
615 write_unlock_irqrestore(&(mlc->lock), flags);
618 write_lock_irqsave(&(mlc->lock), flags);
619 pack = node->object.packet;
620 pack |= ((mlc->ddi + 1) << HIL_PKT_ADDR_SHIFT);
623 write_lock_irqsave(&(mlc->lock), flags);
624 pack = node->object.packet;
625 pack |= ((mlc->ddi + 2) << HIL_PKT_ADDR_SHIFT);
628 write_lock_irqsave(&(mlc->lock), flags);
629 pack = node->object.packet;
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);
637 write_unlock_irqrestore(&(mlc->lock), flags);
639 if (down_trylock(&mlc->osem)) {
640 nextidx = HILSEN_DOZE;
645 write_lock_irqsave(&(mlc->lock), flags);
646 if (!(mlc->ostarted)) {
650 nextidx = HILSEN_DOZE;
651 write_unlock_irqrestore(&(mlc->lock), flags);
655 do_gettimeofday(&(mlc->instart));
656 write_unlock_irqrestore(&(mlc->lock), flags);
657 nextidx = HILSEN_NEXT;
660 nextidx = mlc->cts(mlc) ? node->bad : node->good;
669 if (nextidx == HILSEN_DOZE) doze++;
672 while (nextidx & HILSEN_SCHED) {
675 if (!sched_long) goto sched;
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);
686 tasklet_schedule(&hil_mlcs_tasklet);
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;
693 if (nextidx & HILSEN_BREAK) return 1;
697 /******************** tasklet context functions **************************/
698 static void hil_mlcs_process(unsigned long unused) {
699 struct list_head *tmp;
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) {
706 if (mlc->seidx != 41 &&
709 printk(KERN_DEBUG PREFIX " + ");
713 read_unlock(&hil_mlcs_lock);
716 /************************* Keepalive timer task *********************/
718 void hil_mlcs_timer (unsigned long data) {
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);
726 /******************** user/kernel context functions **********************/
728 static int hil_mlc_serio_write(struct serio *serio, unsigned char c) {
729 struct hil_mlc_serio_map *map;
731 struct serio_driver *drv;
734 map = serio->port_data;
744 mlc->serio_opacket[map->didx] |=
745 ((hil_packet)c) << (8 * (3 - mlc->serio_oidx[map->didx]));
747 if (mlc->serio_oidx[map->didx] >= 3) {
748 /* for now only commands */
749 if (!(mlc->serio_opacket[map->didx] & HIL_PKT_CMD))
751 switch (mlc->serio_opacket[map->didx] & HIL_PKT_DATA_MASK) {
753 idx = mlc->di[map->didx].idd;
756 idx = mlc->di[map->didx].rsc;
759 idx = mlc->di[map->didx].exd;
762 idx = mlc->di[map->didx].rnm;
767 mlc->serio_oidx[map->didx] = 0;
768 mlc->serio_opacket[map->didx] = 0;
771 mlc->serio_oidx[map->didx]++;
780 while ((last != idx) && (*last == 0)) last--;
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);
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);
794 mlc->serio_oidx[map->didx] = 0;
795 mlc->serio_opacket[map->didx] = 0;
800 static int hil_mlc_serio_open(struct serio *serio) {
801 struct hil_mlc_serio_map *map;
804 if (serio_get_drvdata(serio) != NULL)
807 map = serio->port_data;
821 static void hil_mlc_serio_close(struct serio *serio) {
822 struct hil_mlc_serio_map *map;
825 map = serio->port_data;
836 serio_set_drvdata(serio, NULL);
838 /* TODO wake up interruptable */
841 static struct serio_device_id hil_mlc_serio_id = {
842 .type = SERIO_HIL_MLC,
848 int hil_mlc_register(hil_mlc *mlc) {
859 rwlock_init(&mlc->lock);
860 init_MUTEX(&(mlc->osem));
862 init_MUTEX(&(mlc->isem));
868 init_MUTEX_LOCKED(&(mlc->csem));
870 hil_mlc_clear_di_scratch(mlc);
871 hil_mlc_clear_di_map(mlc, 0);
872 for (i = 0; i < HIL_MLC_DEVMEM; i++) {
873 struct serio *mlc_serio;
874 hil_mlc_copy_di_scratch(mlc, i);
875 mlc_serio = kzalloc(sizeof(*mlc_serio), GFP_KERNEL);
876 mlc->serio[i] = mlc_serio;
877 mlc_serio->id = hil_mlc_serio_id;
878 mlc_serio->write = hil_mlc_serio_write;
879 mlc_serio->open = hil_mlc_serio_open;
880 mlc_serio->close = hil_mlc_serio_close;
881 mlc_serio->port_data = &(mlc->serio_map[i]);
882 mlc->serio_map[i].mlc = mlc;
883 mlc->serio_map[i].didx = i;
884 mlc->serio_map[i].di_revmap = -1;
885 mlc->serio_opacket[i] = 0;
886 mlc->serio_oidx[i] = 0;
887 serio_register_port(mlc_serio);
890 mlc->tasklet = &hil_mlcs_tasklet;
892 write_lock_irqsave(&hil_mlcs_lock, flags);
893 list_add_tail(&mlc->list, &hil_mlcs);
894 mlc->seidx = HILSEN_START;
895 write_unlock_irqrestore(&hil_mlcs_lock, flags);
897 tasklet_schedule(&hil_mlcs_tasklet);
901 int hil_mlc_unregister(hil_mlc *mlc) {
902 struct list_head *tmp;
909 write_lock_irqsave(&hil_mlcs_lock, flags);
910 list_for_each(tmp, &hil_mlcs) {
911 if (list_entry(tmp, hil_mlc, list) == mlc)
915 /* not found in list */
916 write_unlock_irqrestore(&hil_mlcs_lock, flags);
917 tasklet_schedule(&hil_mlcs_tasklet);
922 write_unlock_irqrestore(&hil_mlcs_lock, flags);
924 for (i = 0; i < HIL_MLC_DEVMEM; i++) {
925 serio_unregister_port(mlc->serio[i]);
926 mlc->serio[i] = NULL;
929 tasklet_schedule(&hil_mlcs_tasklet);
933 /**************************** Module interface *************************/
935 static int __init hil_mlc_init(void)
937 init_timer(&hil_mlcs_kicker);
938 hil_mlcs_kicker.expires = jiffies + HZ;
939 hil_mlcs_kicker.function = &hil_mlcs_timer;
940 add_timer(&hil_mlcs_kicker);
942 tasklet_enable(&hil_mlcs_tasklet);
947 static void __exit hil_mlc_exit(void)
949 del_timer(&hil_mlcs_kicker);
951 tasklet_disable(&hil_mlcs_tasklet);
952 tasklet_kill(&hil_mlcs_tasklet);
955 module_init(hil_mlc_init);
956 module_exit(hil_mlc_exit);