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1/*
2 * HP i8042-based System Device Controller 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 * System Device Controller Microprocessor Firmware Theory of Operation
31 * for Part Number 1820-4784 Revision B. Dwg No. A-1820-4784-2
32 * Helge Deller's original hilkbd.c port for PA-RISC.
33 *
34 *
35 * Driver theory of operation:
36 *
37 * hp_sdc_put does all writing to the SDC. ISR can run on a different
38 * CPU than hp_sdc_put, but only one CPU runs hp_sdc_put at a time
39 * (it cannot really benefit from SMP anyway.) A tasket fit this perfectly.
40 *
41 * All data coming back from the SDC is sent via interrupt and can be read
42 * fully in the ISR, so there are no latency/throughput problems there.
43 * The problem is with output, due to the slow clock speed of the SDC
44 * compared to the CPU. This should not be too horrible most of the time,
45 * but if used with HIL devices that support the multibyte transfer command,
46 * keeping outbound throughput flowing at the 6500KBps that the HIL is
47 * capable of is more than can be done at HZ=100.
48 *
49 * Busy polling for IBF clear wastes CPU cycles and bus cycles. hp_sdc.ibf
50 * is set to 0 when the IBF flag in the status register has cleared. ISR
51 * may do this, and may also access the parts of queued transactions related
52 * to reading data back from the SDC, but otherwise will not touch the
53 * hp_sdc state. Whenever a register is written hp_sdc.ibf is set to 1.
54 *
55 * The i8042 write index and the values in the 4-byte input buffer
56 * starting at 0x70 are kept track of in hp_sdc.wi, and .r7[], respectively,
57 * to minimize the amount of IO needed to the SDC. However these values
58 * do not need to be locked since they are only ever accessed by hp_sdc_put.
59 *
60 * A timer task schedules the tasklet once per second just to make
61 * sure it doesn't freeze up and to allow for bad reads to time out.
62 */
63
64#include <linux/hp_sdc.h>
65#include <linux/errno.h>
66#include <linux/init.h>
67#include <linux/module.h>
68#include <linux/ioport.h>
69#include <linux/time.h>
70#include <linux/semaphore.h>
71#include <linux/slab.h>
72#include <linux/hil.h>
73#include <asm/io.h>
74
75/* Machine-specific abstraction */
76
77#if defined(__hppa__)
78# include <asm/parisc-device.h>
79# define sdc_readb(p) gsc_readb(p)
80# define sdc_writeb(v,p) gsc_writeb((v),(p))
81#elif defined(__mc68000__)
82#include <linux/uaccess.h>
83# define sdc_readb(p) in_8(p)
84# define sdc_writeb(v,p) out_8((p),(v))
85#else
86# error "HIL is not supported on this platform"
87#endif
88
89#define PREFIX "HP SDC: "
90
91MODULE_AUTHOR("Brian S. Julin <bri@calyx.com>");
92MODULE_DESCRIPTION("HP i8042-based SDC Driver");
93MODULE_LICENSE("Dual BSD/GPL");
94
95EXPORT_SYMBOL(hp_sdc_request_timer_irq);
96EXPORT_SYMBOL(hp_sdc_request_hil_irq);
97EXPORT_SYMBOL(hp_sdc_request_cooked_irq);
98
99EXPORT_SYMBOL(hp_sdc_release_timer_irq);
100EXPORT_SYMBOL(hp_sdc_release_hil_irq);
101EXPORT_SYMBOL(hp_sdc_release_cooked_irq);
102
103EXPORT_SYMBOL(__hp_sdc_enqueue_transaction);
104EXPORT_SYMBOL(hp_sdc_enqueue_transaction);
105EXPORT_SYMBOL(hp_sdc_dequeue_transaction);
106
107static bool hp_sdc_disabled;
108module_param_named(no_hpsdc, hp_sdc_disabled, bool, 0);
109MODULE_PARM_DESC(no_hpsdc, "Do not enable HP SDC driver.");
110
111static hp_i8042_sdc hp_sdc; /* All driver state is kept in here. */
112
113/*************** primitives for use in any context *********************/
114static inline uint8_t hp_sdc_status_in8(void)
115{
116 uint8_t status;
117 unsigned long flags;
118
119 write_lock_irqsave(&hp_sdc.ibf_lock, flags);
120 status = sdc_readb(hp_sdc.status_io);
121 if (!(status & HP_SDC_STATUS_IBF))
122 hp_sdc.ibf = 0;
123 write_unlock_irqrestore(&hp_sdc.ibf_lock, flags);
124
125 return status;
126}
127
128static inline uint8_t hp_sdc_data_in8(void)
129{
130 return sdc_readb(hp_sdc.data_io);
131}
132
133static inline void hp_sdc_status_out8(uint8_t val)
134{
135 unsigned long flags;
136
137 write_lock_irqsave(&hp_sdc.ibf_lock, flags);
138 hp_sdc.ibf = 1;
139 if ((val & 0xf0) == 0xe0)
140 hp_sdc.wi = 0xff;
141 sdc_writeb(val, hp_sdc.status_io);
142 write_unlock_irqrestore(&hp_sdc.ibf_lock, flags);
143}
144
145static inline void hp_sdc_data_out8(uint8_t val)
146{
147 unsigned long flags;
148
149 write_lock_irqsave(&hp_sdc.ibf_lock, flags);
150 hp_sdc.ibf = 1;
151 sdc_writeb(val, hp_sdc.data_io);
152 write_unlock_irqrestore(&hp_sdc.ibf_lock, flags);
153}
154
155/* Care must be taken to only invoke hp_sdc_spin_ibf when
156 * absolutely needed, or in rarely invoked subroutines.
157 * Not only does it waste CPU cycles, it also wastes bus cycles.
158 */
159static inline void hp_sdc_spin_ibf(void)
160{
161 unsigned long flags;
162 rwlock_t *lock;
163
164 lock = &hp_sdc.ibf_lock;
165
166 read_lock_irqsave(lock, flags);
167 if (!hp_sdc.ibf) {
168 read_unlock_irqrestore(lock, flags);
169 return;
170 }
171 read_unlock(lock);
172 write_lock(lock);
173 while (sdc_readb(hp_sdc.status_io) & HP_SDC_STATUS_IBF)
174 { }
175 hp_sdc.ibf = 0;
176 write_unlock_irqrestore(lock, flags);
177}
178
179
180/************************ Interrupt context functions ************************/
181static void hp_sdc_take(int irq, void *dev_id, uint8_t status, uint8_t data)
182{
183 hp_sdc_transaction *curr;
184
185 read_lock(&hp_sdc.rtq_lock);
186 if (hp_sdc.rcurr < 0) {
187 read_unlock(&hp_sdc.rtq_lock);
188 return;
189 }
190 curr = hp_sdc.tq[hp_sdc.rcurr];
191 read_unlock(&hp_sdc.rtq_lock);
192
193 curr->seq[curr->idx++] = status;
194 curr->seq[curr->idx++] = data;
195 hp_sdc.rqty -= 2;
196 hp_sdc.rtime = ktime_get();
197
198 if (hp_sdc.rqty <= 0) {
199 /* All data has been gathered. */
200 if (curr->seq[curr->actidx] & HP_SDC_ACT_SEMAPHORE)
201 if (curr->act.semaphore)
202 up(curr->act.semaphore);
203
204 if (curr->seq[curr->actidx] & HP_SDC_ACT_CALLBACK)
205 if (curr->act.irqhook)
206 curr->act.irqhook(irq, dev_id, status, data);
207
208 curr->actidx = curr->idx;
209 curr->idx++;
210 /* Return control of this transaction */
211 write_lock(&hp_sdc.rtq_lock);
212 hp_sdc.rcurr = -1;
213 hp_sdc.rqty = 0;
214 write_unlock(&hp_sdc.rtq_lock);
215 tasklet_schedule(&hp_sdc.task);
216 }
217}
218
219static irqreturn_t hp_sdc_isr(int irq, void *dev_id)
220{
221 uint8_t status, data;
222
223 status = hp_sdc_status_in8();
224 /* Read data unconditionally to advance i8042. */
225 data = hp_sdc_data_in8();
226
227 /* For now we are ignoring these until we get the SDC to behave. */
228 if (((status & 0xf1) == 0x51) && data == 0x82)
229 return IRQ_HANDLED;
230
231 switch (status & HP_SDC_STATUS_IRQMASK) {
232 case 0: /* This case is not documented. */
233 break;
234
235 case HP_SDC_STATUS_USERTIMER:
236 case HP_SDC_STATUS_PERIODIC:
237 case HP_SDC_STATUS_TIMER:
238 read_lock(&hp_sdc.hook_lock);
239 if (hp_sdc.timer != NULL)
240 hp_sdc.timer(irq, dev_id, status, data);
241 read_unlock(&hp_sdc.hook_lock);
242 break;
243
244 case HP_SDC_STATUS_REG:
245 hp_sdc_take(irq, dev_id, status, data);
246 break;
247
248 case HP_SDC_STATUS_HILCMD:
249 case HP_SDC_STATUS_HILDATA:
250 read_lock(&hp_sdc.hook_lock);
251 if (hp_sdc.hil != NULL)
252 hp_sdc.hil(irq, dev_id, status, data);
253 read_unlock(&hp_sdc.hook_lock);
254 break;
255
256 case HP_SDC_STATUS_PUP:
257 read_lock(&hp_sdc.hook_lock);
258 if (hp_sdc.pup != NULL)
259 hp_sdc.pup(irq, dev_id, status, data);
260 else
261 printk(KERN_INFO PREFIX "HP SDC reports successful PUP.\n");
262 read_unlock(&hp_sdc.hook_lock);
263 break;
264
265 default:
266 read_lock(&hp_sdc.hook_lock);
267 if (hp_sdc.cooked != NULL)
268 hp_sdc.cooked(irq, dev_id, status, data);
269 read_unlock(&hp_sdc.hook_lock);
270 break;
271 }
272
273 return IRQ_HANDLED;
274}
275
276
277static irqreturn_t hp_sdc_nmisr(int irq, void *dev_id)
278{
279 int status;
280
281 status = hp_sdc_status_in8();
282 printk(KERN_WARNING PREFIX "NMI !\n");
283
284#if 0
285 if (status & HP_SDC_NMISTATUS_FHS) {
286 read_lock(&hp_sdc.hook_lock);
287 if (hp_sdc.timer != NULL)
288 hp_sdc.timer(irq, dev_id, status, 0);
289 read_unlock(&hp_sdc.hook_lock);
290 } else {
291 /* TODO: pass this on to the HIL handler, or do SAK here? */
292 printk(KERN_WARNING PREFIX "HIL NMI\n");
293 }
294#endif
295
296 return IRQ_HANDLED;
297}
298
299
300/***************** Kernel (tasklet) context functions ****************/
301
302unsigned long hp_sdc_put(void);
303
304static void hp_sdc_tasklet(unsigned long foo)
305{
306 write_lock_irq(&hp_sdc.rtq_lock);
307
308 if (hp_sdc.rcurr >= 0) {
309 ktime_t now = ktime_get();
310
311 if (ktime_after(now, ktime_add_us(hp_sdc.rtime,
312 HP_SDC_MAX_REG_DELAY))) {
313 hp_sdc_transaction *curr;
314 uint8_t tmp;
315
316 curr = hp_sdc.tq[hp_sdc.rcurr];
317 /* If this turns out to be a normal failure mode
318 * we'll need to figure out a way to communicate
319 * it back to the application. and be less verbose.
320 */
321 printk(KERN_WARNING PREFIX "read timeout (%lldus)!\n",
322 ktime_us_delta(now, hp_sdc.rtime));
323 curr->idx += hp_sdc.rqty;
324 hp_sdc.rqty = 0;
325 tmp = curr->seq[curr->actidx];
326 curr->seq[curr->actidx] |= HP_SDC_ACT_DEAD;
327 if (tmp & HP_SDC_ACT_SEMAPHORE)
328 if (curr->act.semaphore)
329 up(curr->act.semaphore);
330
331 if (tmp & HP_SDC_ACT_CALLBACK) {
332 /* Note this means that irqhooks may be called
333 * in tasklet/bh context.
334 */
335 if (curr->act.irqhook)
336 curr->act.irqhook(0, NULL, 0, 0);
337 }
338
339 curr->actidx = curr->idx;
340 curr->idx++;
341 hp_sdc.rcurr = -1;
342 }
343 }
344 write_unlock_irq(&hp_sdc.rtq_lock);
345 hp_sdc_put();
346}
347
348unsigned long hp_sdc_put(void)
349{
350 hp_sdc_transaction *curr;
351 uint8_t act;
352 int idx, curridx;
353
354 int limit = 0;
355
356 write_lock(&hp_sdc.lock);
357
358 /* If i8042 buffers are full, we cannot do anything that
359 requires output, so we skip to the administrativa. */
360 if (hp_sdc.ibf) {
361 hp_sdc_status_in8();
362 if (hp_sdc.ibf)
363 goto finish;
364 }
365
366 anew:
367 /* See if we are in the middle of a sequence. */
368 if (hp_sdc.wcurr < 0)
369 hp_sdc.wcurr = 0;
370 read_lock_irq(&hp_sdc.rtq_lock);
371 if (hp_sdc.rcurr == hp_sdc.wcurr)
372 hp_sdc.wcurr++;
373 read_unlock_irq(&hp_sdc.rtq_lock);
374 if (hp_sdc.wcurr >= HP_SDC_QUEUE_LEN)
375 hp_sdc.wcurr = 0;
376 curridx = hp_sdc.wcurr;
377
378 if (hp_sdc.tq[curridx] != NULL)
379 goto start;
380
381 while (++curridx != hp_sdc.wcurr) {
382 if (curridx >= HP_SDC_QUEUE_LEN) {
383 curridx = -1; /* Wrap to top */
384 continue;
385 }
386 read_lock_irq(&hp_sdc.rtq_lock);
387 if (hp_sdc.rcurr == curridx) {
388 read_unlock_irq(&hp_sdc.rtq_lock);
389 continue;
390 }
391 read_unlock_irq(&hp_sdc.rtq_lock);
392 if (hp_sdc.tq[curridx] != NULL)
393 break; /* Found one. */
394 }
395 if (curridx == hp_sdc.wcurr) { /* There's nothing queued to do. */
396 curridx = -1;
397 }
398 hp_sdc.wcurr = curridx;
399
400 start:
401
402 /* Check to see if the interrupt mask needs to be set. */
403 if (hp_sdc.set_im) {
404 hp_sdc_status_out8(hp_sdc.im | HP_SDC_CMD_SET_IM);
405 hp_sdc.set_im = 0;
406 goto finish;
407 }
408
409 if (hp_sdc.wcurr == -1)
410 goto done;
411
412 curr = hp_sdc.tq[curridx];
413 idx = curr->actidx;
414
415 if (curr->actidx >= curr->endidx) {
416 hp_sdc.tq[curridx] = NULL;
417 /* Interleave outbound data between the transactions. */
418 hp_sdc.wcurr++;
419 if (hp_sdc.wcurr >= HP_SDC_QUEUE_LEN)
420 hp_sdc.wcurr = 0;
421 goto finish;
422 }
423
424 act = curr->seq[idx];
425 idx++;
426
427 if (curr->idx >= curr->endidx) {
428 if (act & HP_SDC_ACT_DEALLOC)
429 kfree(curr);
430 hp_sdc.tq[curridx] = NULL;
431 /* Interleave outbound data between the transactions. */
432 hp_sdc.wcurr++;
433 if (hp_sdc.wcurr >= HP_SDC_QUEUE_LEN)
434 hp_sdc.wcurr = 0;
435 goto finish;
436 }
437
438 while (act & HP_SDC_ACT_PRECMD) {
439 if (curr->idx != idx) {
440 idx++;
441 act &= ~HP_SDC_ACT_PRECMD;
442 break;
443 }
444 hp_sdc_status_out8(curr->seq[idx]);
445 curr->idx++;
446 /* act finished? */
447 if ((act & HP_SDC_ACT_DURING) == HP_SDC_ACT_PRECMD)
448 goto actdone;
449 /* skip quantity field if data-out sequence follows. */
450 if (act & HP_SDC_ACT_DATAOUT)
451 curr->idx++;
452 goto finish;
453 }
454 if (act & HP_SDC_ACT_DATAOUT) {
455 int qty;
456
457 qty = curr->seq[idx];
458 idx++;
459 if (curr->idx - idx < qty) {
460 hp_sdc_data_out8(curr->seq[curr->idx]);
461 curr->idx++;
462 /* act finished? */
463 if (curr->idx - idx >= qty &&
464 (act & HP_SDC_ACT_DURING) == HP_SDC_ACT_DATAOUT)
465 goto actdone;
466 goto finish;
467 }
468 idx += qty;
469 act &= ~HP_SDC_ACT_DATAOUT;
470 } else
471 while (act & HP_SDC_ACT_DATAREG) {
472 int mask;
473 uint8_t w7[4];
474
475 mask = curr->seq[idx];
476 if (idx != curr->idx) {
477 idx++;
478 idx += !!(mask & 1);
479 idx += !!(mask & 2);
480 idx += !!(mask & 4);
481 idx += !!(mask & 8);
482 act &= ~HP_SDC_ACT_DATAREG;
483 break;
484 }
485
486 w7[0] = (mask & 1) ? curr->seq[++idx] : hp_sdc.r7[0];
487 w7[1] = (mask & 2) ? curr->seq[++idx] : hp_sdc.r7[1];
488 w7[2] = (mask & 4) ? curr->seq[++idx] : hp_sdc.r7[2];
489 w7[3] = (mask & 8) ? curr->seq[++idx] : hp_sdc.r7[3];
490
491 if (hp_sdc.wi > 0x73 || hp_sdc.wi < 0x70 ||
492 w7[hp_sdc.wi - 0x70] == hp_sdc.r7[hp_sdc.wi - 0x70]) {
493 int i = 0;
494
495 /* Need to point the write index register */
496 while (i < 4 && w7[i] == hp_sdc.r7[i])
497 i++;
498
499 if (i < 4) {
500 hp_sdc_status_out8(HP_SDC_CMD_SET_D0 + i);
501 hp_sdc.wi = 0x70 + i;
502 goto finish;
503 }
504
505 idx++;
506 if ((act & HP_SDC_ACT_DURING) == HP_SDC_ACT_DATAREG)
507 goto actdone;
508
509 curr->idx = idx;
510 act &= ~HP_SDC_ACT_DATAREG;
511 break;
512 }
513
514 hp_sdc_data_out8(w7[hp_sdc.wi - 0x70]);
515 hp_sdc.r7[hp_sdc.wi - 0x70] = w7[hp_sdc.wi - 0x70];
516 hp_sdc.wi++; /* write index register autoincrements */
517 {
518 int i = 0;
519
520 while ((i < 4) && w7[i] == hp_sdc.r7[i])
521 i++;
522 if (i >= 4) {
523 curr->idx = idx + 1;
524 if ((act & HP_SDC_ACT_DURING) ==
525 HP_SDC_ACT_DATAREG)
526 goto actdone;
527 }
528 }
529 goto finish;
530 }
531 /* We don't go any further in the command if there is a pending read,
532 because we don't want interleaved results. */
533 read_lock_irq(&hp_sdc.rtq_lock);
534 if (hp_sdc.rcurr >= 0) {
535 read_unlock_irq(&hp_sdc.rtq_lock);
536 goto finish;
537 }
538 read_unlock_irq(&hp_sdc.rtq_lock);
539
540
541 if (act & HP_SDC_ACT_POSTCMD) {
542 uint8_t postcmd;
543
544 /* curr->idx should == idx at this point. */
545 postcmd = curr->seq[idx];
546 curr->idx++;
547 if (act & HP_SDC_ACT_DATAIN) {
548
549 /* Start a new read */
550 hp_sdc.rqty = curr->seq[curr->idx];
551 hp_sdc.rtime = ktime_get();
552 curr->idx++;
553 /* Still need to lock here in case of spurious irq. */
554 write_lock_irq(&hp_sdc.rtq_lock);
555 hp_sdc.rcurr = curridx;
556 write_unlock_irq(&hp_sdc.rtq_lock);
557 hp_sdc_status_out8(postcmd);
558 goto finish;
559 }
560 hp_sdc_status_out8(postcmd);
561 goto actdone;
562 }
563
564 actdone:
565 if (act & HP_SDC_ACT_SEMAPHORE)
566 up(curr->act.semaphore);
567 else if (act & HP_SDC_ACT_CALLBACK)
568 curr->act.irqhook(0,NULL,0,0);
569
570 if (curr->idx >= curr->endidx) { /* This transaction is over. */
571 if (act & HP_SDC_ACT_DEALLOC)
572 kfree(curr);
573 hp_sdc.tq[curridx] = NULL;
574 } else {
575 curr->actidx = idx + 1;
576 curr->idx = idx + 2;
577 }
578 /* Interleave outbound data between the transactions. */
579 hp_sdc.wcurr++;
580 if (hp_sdc.wcurr >= HP_SDC_QUEUE_LEN)
581 hp_sdc.wcurr = 0;
582
583 finish:
584 /* If by some quirk IBF has cleared and our ISR has run to
585 see that that has happened, do it all again. */
586 if (!hp_sdc.ibf && limit++ < 20)
587 goto anew;
588
589 done:
590 if (hp_sdc.wcurr >= 0)
591 tasklet_schedule(&hp_sdc.task);
592 write_unlock(&hp_sdc.lock);
593
594 return 0;
595}
596
597/******* Functions called in either user or kernel context ****/
598int __hp_sdc_enqueue_transaction(hp_sdc_transaction *this)
599{
600 int i;
601
602 if (this == NULL) {
603 BUG();
604 return -EINVAL;
605 }
606
607 /* Can't have same transaction on queue twice */
608 for (i = 0; i < HP_SDC_QUEUE_LEN; i++)
609 if (hp_sdc.tq[i] == this)
610 goto fail;
611
612 this->actidx = 0;
613 this->idx = 1;
614
615 /* Search for empty slot */
616 for (i = 0; i < HP_SDC_QUEUE_LEN; i++)
617 if (hp_sdc.tq[i] == NULL) {
618 hp_sdc.tq[i] = this;
619 tasklet_schedule(&hp_sdc.task);
620 return 0;
621 }
622
623 printk(KERN_WARNING PREFIX "No free slot to add transaction.\n");
624 return -EBUSY;
625
626 fail:
627 printk(KERN_WARNING PREFIX "Transaction add failed: transaction already queued?\n");
628 return -EINVAL;
629}
630
631int hp_sdc_enqueue_transaction(hp_sdc_transaction *this) {
632 unsigned long flags;
633 int ret;
634
635 write_lock_irqsave(&hp_sdc.lock, flags);
636 ret = __hp_sdc_enqueue_transaction(this);
637 write_unlock_irqrestore(&hp_sdc.lock,flags);
638
639 return ret;
640}
641
642int hp_sdc_dequeue_transaction(hp_sdc_transaction *this)
643{
644 unsigned long flags;
645 int i;
646
647 write_lock_irqsave(&hp_sdc.lock, flags);
648
649 /* TODO: don't remove it if it's not done. */
650
651 for (i = 0; i < HP_SDC_QUEUE_LEN; i++)
652 if (hp_sdc.tq[i] == this)
653 hp_sdc.tq[i] = NULL;
654
655 write_unlock_irqrestore(&hp_sdc.lock, flags);
656 return 0;
657}
658
659
660
661/********************** User context functions **************************/
662int hp_sdc_request_timer_irq(hp_sdc_irqhook *callback)
663{
664 if (callback == NULL || hp_sdc.dev == NULL)
665 return -EINVAL;
666
667 write_lock_irq(&hp_sdc.hook_lock);
668 if (hp_sdc.timer != NULL) {
669 write_unlock_irq(&hp_sdc.hook_lock);
670 return -EBUSY;
671 }
672
673 hp_sdc.timer = callback;
674 /* Enable interrupts from the timers */
675 hp_sdc.im &= ~HP_SDC_IM_FH;
676 hp_sdc.im &= ~HP_SDC_IM_PT;
677 hp_sdc.im &= ~HP_SDC_IM_TIMERS;
678 hp_sdc.set_im = 1;
679 write_unlock_irq(&hp_sdc.hook_lock);
680
681 tasklet_schedule(&hp_sdc.task);
682
683 return 0;
684}
685
686int hp_sdc_request_hil_irq(hp_sdc_irqhook *callback)
687{
688 if (callback == NULL || hp_sdc.dev == NULL)
689 return -EINVAL;
690
691 write_lock_irq(&hp_sdc.hook_lock);
692 if (hp_sdc.hil != NULL) {
693 write_unlock_irq(&hp_sdc.hook_lock);
694 return -EBUSY;
695 }
696
697 hp_sdc.hil = callback;
698 hp_sdc.im &= ~(HP_SDC_IM_HIL | HP_SDC_IM_RESET);
699 hp_sdc.set_im = 1;
700 write_unlock_irq(&hp_sdc.hook_lock);
701
702 tasklet_schedule(&hp_sdc.task);
703
704 return 0;
705}
706
707int hp_sdc_request_cooked_irq(hp_sdc_irqhook *callback)
708{
709 if (callback == NULL || hp_sdc.dev == NULL)
710 return -EINVAL;
711
712 write_lock_irq(&hp_sdc.hook_lock);
713 if (hp_sdc.cooked != NULL) {
714 write_unlock_irq(&hp_sdc.hook_lock);
715 return -EBUSY;
716 }
717
718 /* Enable interrupts from the HIL MLC */
719 hp_sdc.cooked = callback;
720 hp_sdc.im &= ~(HP_SDC_IM_HIL | HP_SDC_IM_RESET);
721 hp_sdc.set_im = 1;
722 write_unlock_irq(&hp_sdc.hook_lock);
723
724 tasklet_schedule(&hp_sdc.task);
725
726 return 0;
727}
728
729int hp_sdc_release_timer_irq(hp_sdc_irqhook *callback)
730{
731 write_lock_irq(&hp_sdc.hook_lock);
732 if ((callback != hp_sdc.timer) ||
733 (hp_sdc.timer == NULL)) {
734 write_unlock_irq(&hp_sdc.hook_lock);
735 return -EINVAL;
736 }
737
738 /* Disable interrupts from the timers */
739 hp_sdc.timer = NULL;
740 hp_sdc.im |= HP_SDC_IM_TIMERS;
741 hp_sdc.im |= HP_SDC_IM_FH;
742 hp_sdc.im |= HP_SDC_IM_PT;
743 hp_sdc.set_im = 1;
744 write_unlock_irq(&hp_sdc.hook_lock);
745 tasklet_schedule(&hp_sdc.task);
746
747 return 0;
748}
749
750int hp_sdc_release_hil_irq(hp_sdc_irqhook *callback)
751{
752 write_lock_irq(&hp_sdc.hook_lock);
753 if ((callback != hp_sdc.hil) ||
754 (hp_sdc.hil == NULL)) {
755 write_unlock_irq(&hp_sdc.hook_lock);
756 return -EINVAL;
757 }
758
759 hp_sdc.hil = NULL;
760 /* Disable interrupts from HIL only if there is no cooked driver. */
761 if(hp_sdc.cooked == NULL) {
762 hp_sdc.im |= (HP_SDC_IM_HIL | HP_SDC_IM_RESET);
763 hp_sdc.set_im = 1;
764 }
765 write_unlock_irq(&hp_sdc.hook_lock);
766 tasklet_schedule(&hp_sdc.task);
767
768 return 0;
769}
770
771int hp_sdc_release_cooked_irq(hp_sdc_irqhook *callback)
772{
773 write_lock_irq(&hp_sdc.hook_lock);
774 if ((callback != hp_sdc.cooked) ||
775 (hp_sdc.cooked == NULL)) {
776 write_unlock_irq(&hp_sdc.hook_lock);
777 return -EINVAL;
778 }
779
780 hp_sdc.cooked = NULL;
781 /* Disable interrupts from HIL only if there is no raw HIL driver. */
782 if(hp_sdc.hil == NULL) {
783 hp_sdc.im |= (HP_SDC_IM_HIL | HP_SDC_IM_RESET);
784 hp_sdc.set_im = 1;
785 }
786 write_unlock_irq(&hp_sdc.hook_lock);
787 tasklet_schedule(&hp_sdc.task);
788
789 return 0;
790}
791
792/************************* Keepalive timer task *********************/
793
794static void hp_sdc_kicker(struct timer_list *unused)
795{
796 tasklet_schedule(&hp_sdc.task);
797 /* Re-insert the periodic task. */
798 mod_timer(&hp_sdc.kicker, jiffies + HZ);
799}
800
801/************************** Module Initialization ***************************/
802
803#if defined(__hppa__)
804
805static const struct parisc_device_id hp_sdc_tbl[] __initconst = {
806 {
807 .hw_type = HPHW_FIO,
808 .hversion_rev = HVERSION_REV_ANY_ID,
809 .hversion = HVERSION_ANY_ID,
810 .sversion = 0x73,
811 },
812 { 0, }
813};
814
815MODULE_DEVICE_TABLE(parisc, hp_sdc_tbl);
816
817static int __init hp_sdc_init_hppa(struct parisc_device *d);
818static struct delayed_work moduleloader_work;
819
820static struct parisc_driver hp_sdc_driver __refdata = {
821 .name = "hp_sdc",
822 .id_table = hp_sdc_tbl,
823 .probe = hp_sdc_init_hppa,
824};
825
826#endif /* __hppa__ */
827
828static int __init hp_sdc_init(void)
829{
830 char *errstr;
831 hp_sdc_transaction t_sync;
832 uint8_t ts_sync[6];
833 struct semaphore s_sync;
834
835 rwlock_init(&hp_sdc.lock);
836 rwlock_init(&hp_sdc.ibf_lock);
837 rwlock_init(&hp_sdc.rtq_lock);
838 rwlock_init(&hp_sdc.hook_lock);
839
840 hp_sdc.timer = NULL;
841 hp_sdc.hil = NULL;
842 hp_sdc.pup = NULL;
843 hp_sdc.cooked = NULL;
844 hp_sdc.im = HP_SDC_IM_MASK; /* Mask maskable irqs */
845 hp_sdc.set_im = 1;
846 hp_sdc.wi = 0xff;
847 hp_sdc.r7[0] = 0xff;
848 hp_sdc.r7[1] = 0xff;
849 hp_sdc.r7[2] = 0xff;
850 hp_sdc.r7[3] = 0xff;
851 hp_sdc.ibf = 1;
852
853 memset(&hp_sdc.tq, 0, sizeof(hp_sdc.tq));
854
855 hp_sdc.wcurr = -1;
856 hp_sdc.rcurr = -1;
857 hp_sdc.rqty = 0;
858
859 hp_sdc.dev_err = -ENODEV;
860
861 errstr = "IO not found for";
862 if (!hp_sdc.base_io)
863 goto err0;
864
865 errstr = "IRQ not found for";
866 if (!hp_sdc.irq)
867 goto err0;
868
869 hp_sdc.dev_err = -EBUSY;
870
871#if defined(__hppa__)
872 errstr = "IO not available for";
873 if (request_region(hp_sdc.data_io, 2, hp_sdc_driver.name))
874 goto err0;
875#endif
876
877 errstr = "IRQ not available for";
878 if (request_irq(hp_sdc.irq, &hp_sdc_isr, IRQF_SHARED,
879 "HP SDC", &hp_sdc))
880 goto err1;
881
882 errstr = "NMI not available for";
883 if (request_irq(hp_sdc.nmi, &hp_sdc_nmisr, IRQF_SHARED,
884 "HP SDC NMI", &hp_sdc))
885 goto err2;
886
887 pr_info(PREFIX "HP SDC at 0x%08lx, IRQ %d (NMI IRQ %d)\n",
888 hp_sdc.base_io, hp_sdc.irq, hp_sdc.nmi);
889
890 hp_sdc_status_in8();
891 hp_sdc_data_in8();
892
893 tasklet_init(&hp_sdc.task, hp_sdc_tasklet, 0);
894
895 /* Sync the output buffer registers, thus scheduling hp_sdc_tasklet. */
896 t_sync.actidx = 0;
897 t_sync.idx = 1;
898 t_sync.endidx = 6;
899 t_sync.seq = ts_sync;
900 ts_sync[0] = HP_SDC_ACT_DATAREG | HP_SDC_ACT_SEMAPHORE;
901 ts_sync[1] = 0x0f;
902 ts_sync[2] = ts_sync[3] = ts_sync[4] = ts_sync[5] = 0;
903 t_sync.act.semaphore = &s_sync;
904 sema_init(&s_sync, 0);
905 hp_sdc_enqueue_transaction(&t_sync);
906 down(&s_sync); /* Wait for t_sync to complete */
907
908 /* Create the keepalive task */
909 timer_setup(&hp_sdc.kicker, hp_sdc_kicker, 0);
910 hp_sdc.kicker.expires = jiffies + HZ;
911 add_timer(&hp_sdc.kicker);
912
913 hp_sdc.dev_err = 0;
914 return 0;
915 err2:
916 free_irq(hp_sdc.irq, &hp_sdc);
917 err1:
918 release_region(hp_sdc.data_io, 2);
919 err0:
920 printk(KERN_WARNING PREFIX ": %s SDC IO=0x%p IRQ=0x%x NMI=0x%x\n",
921 errstr, (void *)hp_sdc.base_io, hp_sdc.irq, hp_sdc.nmi);
922 hp_sdc.dev = NULL;
923
924 return hp_sdc.dev_err;
925}
926
927#if defined(__hppa__)
928
929static void request_module_delayed(struct work_struct *work)
930{
931 request_module("hp_sdc_mlc");
932}
933
934static int __init hp_sdc_init_hppa(struct parisc_device *d)
935{
936 int ret;
937
938 if (!d)
939 return 1;
940 if (hp_sdc.dev != NULL)
941 return 1; /* We only expect one SDC */
942
943 hp_sdc.dev = d;
944 hp_sdc.irq = d->irq;
945 hp_sdc.nmi = d->aux_irq;
946 hp_sdc.base_io = d->hpa.start;
947 hp_sdc.data_io = d->hpa.start + 0x800;
948 hp_sdc.status_io = d->hpa.start + 0x801;
949
950 INIT_DELAYED_WORK(&moduleloader_work, request_module_delayed);
951
952 ret = hp_sdc_init();
953 /* after successful initialization give SDC some time to settle
954 * and then load the hp_sdc_mlc upper layer driver */
955 if (!ret)
956 schedule_delayed_work(&moduleloader_work,
957 msecs_to_jiffies(2000));
958
959 return ret;
960}
961
962#endif /* __hppa__ */
963
964static void hp_sdc_exit(void)
965{
966 /* do nothing if we don't have a SDC */
967 if (!hp_sdc.dev)
968 return;
969
970 write_lock_irq(&hp_sdc.lock);
971
972 /* Turn off all maskable "sub-function" irq's. */
973 hp_sdc_spin_ibf();
974 sdc_writeb(HP_SDC_CMD_SET_IM | HP_SDC_IM_MASK, hp_sdc.status_io);
975
976 /* Wait until we know this has been processed by the i8042 */
977 hp_sdc_spin_ibf();
978
979 free_irq(hp_sdc.nmi, &hp_sdc);
980 free_irq(hp_sdc.irq, &hp_sdc);
981 write_unlock_irq(&hp_sdc.lock);
982
983 del_timer_sync(&hp_sdc.kicker);
984
985 tasklet_kill(&hp_sdc.task);
986
987#if defined(__hppa__)
988 cancel_delayed_work_sync(&moduleloader_work);
989 if (unregister_parisc_driver(&hp_sdc_driver))
990 printk(KERN_WARNING PREFIX "Error unregistering HP SDC");
991#endif
992}
993
994static int __init hp_sdc_register(void)
995{
996 hp_sdc_transaction tq_init;
997 uint8_t tq_init_seq[5];
998 struct semaphore tq_init_sem;
999#if defined(__mc68000__)
1000 unsigned char i;
1001#endif
1002
1003 if (hp_sdc_disabled) {
1004 printk(KERN_WARNING PREFIX "HP SDC driver disabled by no_hpsdc=1.\n");
1005 return -ENODEV;
1006 }
1007
1008 hp_sdc.dev = NULL;
1009 hp_sdc.dev_err = 0;
1010#if defined(__hppa__)
1011 if (register_parisc_driver(&hp_sdc_driver)) {
1012 printk(KERN_WARNING PREFIX "Error registering SDC with system bus tree.\n");
1013 return -ENODEV;
1014 }
1015#elif defined(__mc68000__)
1016 if (!MACH_IS_HP300)
1017 return -ENODEV;
1018
1019 hp_sdc.irq = 1;
1020 hp_sdc.nmi = 7;
1021 hp_sdc.base_io = (unsigned long) 0xf0428000;
1022 hp_sdc.data_io = (unsigned long) hp_sdc.base_io + 1;
1023 hp_sdc.status_io = (unsigned long) hp_sdc.base_io + 3;
1024 if (!copy_from_kernel_nofault(&i, (unsigned char *)hp_sdc.data_io, 1))
1025 hp_sdc.dev = (void *)1;
1026 hp_sdc.dev_err = hp_sdc_init();
1027#endif
1028 if (hp_sdc.dev == NULL) {
1029 printk(KERN_WARNING PREFIX "No SDC found.\n");
1030 return hp_sdc.dev_err;
1031 }
1032
1033 sema_init(&tq_init_sem, 0);
1034
1035 tq_init.actidx = 0;
1036 tq_init.idx = 1;
1037 tq_init.endidx = 5;
1038 tq_init.seq = tq_init_seq;
1039 tq_init.act.semaphore = &tq_init_sem;
1040
1041 tq_init_seq[0] =
1042 HP_SDC_ACT_POSTCMD | HP_SDC_ACT_DATAIN | HP_SDC_ACT_SEMAPHORE;
1043 tq_init_seq[1] = HP_SDC_CMD_READ_KCC;
1044 tq_init_seq[2] = 1;
1045 tq_init_seq[3] = 0;
1046 tq_init_seq[4] = 0;
1047
1048 hp_sdc_enqueue_transaction(&tq_init);
1049
1050 down(&tq_init_sem);
1051 up(&tq_init_sem);
1052
1053 if ((tq_init_seq[0] & HP_SDC_ACT_DEAD) == HP_SDC_ACT_DEAD) {
1054 printk(KERN_WARNING PREFIX "Error reading config byte.\n");
1055 hp_sdc_exit();
1056 return -ENODEV;
1057 }
1058 hp_sdc.r11 = tq_init_seq[4];
1059 if (hp_sdc.r11 & HP_SDC_CFG_NEW) {
1060 const char *str;
1061 printk(KERN_INFO PREFIX "New style SDC\n");
1062 tq_init_seq[1] = HP_SDC_CMD_READ_XTD;
1063 tq_init.actidx = 0;
1064 tq_init.idx = 1;
1065 down(&tq_init_sem);
1066 hp_sdc_enqueue_transaction(&tq_init);
1067 down(&tq_init_sem);
1068 up(&tq_init_sem);
1069 if ((tq_init_seq[0] & HP_SDC_ACT_DEAD) == HP_SDC_ACT_DEAD) {
1070 printk(KERN_WARNING PREFIX "Error reading extended config byte.\n");
1071 return -ENODEV;
1072 }
1073 hp_sdc.r7e = tq_init_seq[4];
1074 HP_SDC_XTD_REV_STRINGS(hp_sdc.r7e & HP_SDC_XTD_REV, str)
1075 printk(KERN_INFO PREFIX "Revision: %s\n", str);
1076 if (hp_sdc.r7e & HP_SDC_XTD_BEEPER)
1077 printk(KERN_INFO PREFIX "TI SN76494 beeper present\n");
1078 if (hp_sdc.r7e & HP_SDC_XTD_BBRTC)
1079 printk(KERN_INFO PREFIX "OKI MSM-58321 BBRTC present\n");
1080 printk(KERN_INFO PREFIX "Spunking the self test register to force PUP "
1081 "on next firmware reset.\n");
1082 tq_init_seq[0] = HP_SDC_ACT_PRECMD |
1083 HP_SDC_ACT_DATAOUT | HP_SDC_ACT_SEMAPHORE;
1084 tq_init_seq[1] = HP_SDC_CMD_SET_STR;
1085 tq_init_seq[2] = 1;
1086 tq_init_seq[3] = 0;
1087 tq_init.actidx = 0;
1088 tq_init.idx = 1;
1089 tq_init.endidx = 4;
1090 down(&tq_init_sem);
1091 hp_sdc_enqueue_transaction(&tq_init);
1092 down(&tq_init_sem);
1093 up(&tq_init_sem);
1094 } else
1095 printk(KERN_INFO PREFIX "Old style SDC (1820-%s).\n",
1096 (hp_sdc.r11 & HP_SDC_CFG_REV) ? "3300" : "2564/3087");
1097
1098 return 0;
1099}
1100
1101module_init(hp_sdc_register);
1102module_exit(hp_sdc_exit);
1103
1104/* Timing notes: These measurements taken on my 64MHz 7100-LC (715/64)
1105 * cycles cycles-adj time
1106 * between two consecutive mfctl(16)'s: 4 n/a 63ns
1107 * hp_sdc_spin_ibf when idle: 119 115 1.7us
1108 * gsc_writeb status register: 83 79 1.2us
1109 * IBF to clear after sending SET_IM: 6204 6006 93us
1110 * IBF to clear after sending LOAD_RT: 4467 4352 68us
1111 * IBF to clear after sending two LOAD_RTs: 18974 18859 295us
1112 * READ_T1, read status/data, IRQ, call handler: 35564 n/a 556us
1113 * cmd to ~IBF READ_T1 2nd time right after: 5158403 n/a 81ms
1114 * between IRQ received and ~IBF for above: 2578877 n/a 40ms
1115 *
1116 * Performance stats after a run of this module configuring HIL and
1117 * receiving a few mouse events:
1118 *
1119 * status in8 282508 cycles 7128 calls
1120 * status out8 8404 cycles 341 calls
1121 * data out8 1734 cycles 78 calls
1122 * isr 174324 cycles 617 calls (includes take)
1123 * take 1241 cycles 2 calls
1124 * put 1411504 cycles 6937 calls
1125 * task 1655209 cycles 6937 calls (includes put)
1126 *
1127 */
1/*
2 * HP i8042-based System Device Controller 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 * System Device Controller Microprocessor Firmware Theory of Operation
31 * for Part Number 1820-4784 Revision B. Dwg No. A-1820-4784-2
32 * Helge Deller's original hilkbd.c port for PA-RISC.
33 *
34 *
35 * Driver theory of operation:
36 *
37 * hp_sdc_put does all writing to the SDC. ISR can run on a different
38 * CPU than hp_sdc_put, but only one CPU runs hp_sdc_put at a time
39 * (it cannot really benefit from SMP anyway.) A tasket fit this perfectly.
40 *
41 * All data coming back from the SDC is sent via interrupt and can be read
42 * fully in the ISR, so there are no latency/throughput problems there.
43 * The problem is with output, due to the slow clock speed of the SDC
44 * compared to the CPU. This should not be too horrible most of the time,
45 * but if used with HIL devices that support the multibyte transfer command,
46 * keeping outbound throughput flowing at the 6500KBps that the HIL is
47 * capable of is more than can be done at HZ=100.
48 *
49 * Busy polling for IBF clear wastes CPU cycles and bus cycles. hp_sdc.ibf
50 * is set to 0 when the IBF flag in the status register has cleared. ISR
51 * may do this, and may also access the parts of queued transactions related
52 * to reading data back from the SDC, but otherwise will not touch the
53 * hp_sdc state. Whenever a register is written hp_sdc.ibf is set to 1.
54 *
55 * The i8042 write index and the values in the 4-byte input buffer
56 * starting at 0x70 are kept track of in hp_sdc.wi, and .r7[], respectively,
57 * to minimize the amount of IO needed to the SDC. However these values
58 * do not need to be locked since they are only ever accessed by hp_sdc_put.
59 *
60 * A timer task schedules the tasklet once per second just to make
61 * sure it doesn't freeze up and to allow for bad reads to time out.
62 */
63
64#include <linux/hp_sdc.h>
65#include <linux/errno.h>
66#include <linux/init.h>
67#include <linux/module.h>
68#include <linux/ioport.h>
69#include <linux/time.h>
70#include <linux/semaphore.h>
71#include <linux/slab.h>
72#include <linux/hil.h>
73#include <asm/io.h>
74#include <asm/system.h>
75
76/* Machine-specific abstraction */
77
78#if defined(__hppa__)
79# include <asm/parisc-device.h>
80# define sdc_readb(p) gsc_readb(p)
81# define sdc_writeb(v,p) gsc_writeb((v),(p))
82#elif defined(__mc68000__)
83# include <asm/uaccess.h>
84# define sdc_readb(p) in_8(p)
85# define sdc_writeb(v,p) out_8((p),(v))
86#else
87# error "HIL is not supported on this platform"
88#endif
89
90#define PREFIX "HP SDC: "
91
92MODULE_AUTHOR("Brian S. Julin <bri@calyx.com>");
93MODULE_DESCRIPTION("HP i8042-based SDC Driver");
94MODULE_LICENSE("Dual BSD/GPL");
95
96EXPORT_SYMBOL(hp_sdc_request_timer_irq);
97EXPORT_SYMBOL(hp_sdc_request_hil_irq);
98EXPORT_SYMBOL(hp_sdc_request_cooked_irq);
99
100EXPORT_SYMBOL(hp_sdc_release_timer_irq);
101EXPORT_SYMBOL(hp_sdc_release_hil_irq);
102EXPORT_SYMBOL(hp_sdc_release_cooked_irq);
103
104EXPORT_SYMBOL(__hp_sdc_enqueue_transaction);
105EXPORT_SYMBOL(hp_sdc_enqueue_transaction);
106EXPORT_SYMBOL(hp_sdc_dequeue_transaction);
107
108static unsigned int hp_sdc_disabled;
109module_param_named(no_hpsdc, hp_sdc_disabled, bool, 0);
110MODULE_PARM_DESC(no_hpsdc, "Do not enable HP SDC driver.");
111
112static hp_i8042_sdc hp_sdc; /* All driver state is kept in here. */
113
114/*************** primitives for use in any context *********************/
115static inline uint8_t hp_sdc_status_in8(void)
116{
117 uint8_t status;
118 unsigned long flags;
119
120 write_lock_irqsave(&hp_sdc.ibf_lock, flags);
121 status = sdc_readb(hp_sdc.status_io);
122 if (!(status & HP_SDC_STATUS_IBF))
123 hp_sdc.ibf = 0;
124 write_unlock_irqrestore(&hp_sdc.ibf_lock, flags);
125
126 return status;
127}
128
129static inline uint8_t hp_sdc_data_in8(void)
130{
131 return sdc_readb(hp_sdc.data_io);
132}
133
134static inline void hp_sdc_status_out8(uint8_t val)
135{
136 unsigned long flags;
137
138 write_lock_irqsave(&hp_sdc.ibf_lock, flags);
139 hp_sdc.ibf = 1;
140 if ((val & 0xf0) == 0xe0)
141 hp_sdc.wi = 0xff;
142 sdc_writeb(val, hp_sdc.status_io);
143 write_unlock_irqrestore(&hp_sdc.ibf_lock, flags);
144}
145
146static inline void hp_sdc_data_out8(uint8_t val)
147{
148 unsigned long flags;
149
150 write_lock_irqsave(&hp_sdc.ibf_lock, flags);
151 hp_sdc.ibf = 1;
152 sdc_writeb(val, hp_sdc.data_io);
153 write_unlock_irqrestore(&hp_sdc.ibf_lock, flags);
154}
155
156/* Care must be taken to only invoke hp_sdc_spin_ibf when
157 * absolutely needed, or in rarely invoked subroutines.
158 * Not only does it waste CPU cycles, it also wastes bus cycles.
159 */
160static inline void hp_sdc_spin_ibf(void)
161{
162 unsigned long flags;
163 rwlock_t *lock;
164
165 lock = &hp_sdc.ibf_lock;
166
167 read_lock_irqsave(lock, flags);
168 if (!hp_sdc.ibf) {
169 read_unlock_irqrestore(lock, flags);
170 return;
171 }
172 read_unlock(lock);
173 write_lock(lock);
174 while (sdc_readb(hp_sdc.status_io) & HP_SDC_STATUS_IBF)
175 { }
176 hp_sdc.ibf = 0;
177 write_unlock_irqrestore(lock, flags);
178}
179
180
181/************************ Interrupt context functions ************************/
182static void hp_sdc_take(int irq, void *dev_id, uint8_t status, uint8_t data)
183{
184 hp_sdc_transaction *curr;
185
186 read_lock(&hp_sdc.rtq_lock);
187 if (hp_sdc.rcurr < 0) {
188 read_unlock(&hp_sdc.rtq_lock);
189 return;
190 }
191 curr = hp_sdc.tq[hp_sdc.rcurr];
192 read_unlock(&hp_sdc.rtq_lock);
193
194 curr->seq[curr->idx++] = status;
195 curr->seq[curr->idx++] = data;
196 hp_sdc.rqty -= 2;
197 do_gettimeofday(&hp_sdc.rtv);
198
199 if (hp_sdc.rqty <= 0) {
200 /* All data has been gathered. */
201 if (curr->seq[curr->actidx] & HP_SDC_ACT_SEMAPHORE)
202 if (curr->act.semaphore)
203 up(curr->act.semaphore);
204
205 if (curr->seq[curr->actidx] & HP_SDC_ACT_CALLBACK)
206 if (curr->act.irqhook)
207 curr->act.irqhook(irq, dev_id, status, data);
208
209 curr->actidx = curr->idx;
210 curr->idx++;
211 /* Return control of this transaction */
212 write_lock(&hp_sdc.rtq_lock);
213 hp_sdc.rcurr = -1;
214 hp_sdc.rqty = 0;
215 write_unlock(&hp_sdc.rtq_lock);
216 tasklet_schedule(&hp_sdc.task);
217 }
218}
219
220static irqreturn_t hp_sdc_isr(int irq, void *dev_id)
221{
222 uint8_t status, data;
223
224 status = hp_sdc_status_in8();
225 /* Read data unconditionally to advance i8042. */
226 data = hp_sdc_data_in8();
227
228 /* For now we are ignoring these until we get the SDC to behave. */
229 if (((status & 0xf1) == 0x51) && data == 0x82)
230 return IRQ_HANDLED;
231
232 switch (status & HP_SDC_STATUS_IRQMASK) {
233 case 0: /* This case is not documented. */
234 break;
235
236 case HP_SDC_STATUS_USERTIMER:
237 case HP_SDC_STATUS_PERIODIC:
238 case HP_SDC_STATUS_TIMER:
239 read_lock(&hp_sdc.hook_lock);
240 if (hp_sdc.timer != NULL)
241 hp_sdc.timer(irq, dev_id, status, data);
242 read_unlock(&hp_sdc.hook_lock);
243 break;
244
245 case HP_SDC_STATUS_REG:
246 hp_sdc_take(irq, dev_id, status, data);
247 break;
248
249 case HP_SDC_STATUS_HILCMD:
250 case HP_SDC_STATUS_HILDATA:
251 read_lock(&hp_sdc.hook_lock);
252 if (hp_sdc.hil != NULL)
253 hp_sdc.hil(irq, dev_id, status, data);
254 read_unlock(&hp_sdc.hook_lock);
255 break;
256
257 case HP_SDC_STATUS_PUP:
258 read_lock(&hp_sdc.hook_lock);
259 if (hp_sdc.pup != NULL)
260 hp_sdc.pup(irq, dev_id, status, data);
261 else
262 printk(KERN_INFO PREFIX "HP SDC reports successful PUP.\n");
263 read_unlock(&hp_sdc.hook_lock);
264 break;
265
266 default:
267 read_lock(&hp_sdc.hook_lock);
268 if (hp_sdc.cooked != NULL)
269 hp_sdc.cooked(irq, dev_id, status, data);
270 read_unlock(&hp_sdc.hook_lock);
271 break;
272 }
273
274 return IRQ_HANDLED;
275}
276
277
278static irqreturn_t hp_sdc_nmisr(int irq, void *dev_id)
279{
280 int status;
281
282 status = hp_sdc_status_in8();
283 printk(KERN_WARNING PREFIX "NMI !\n");
284
285#if 0
286 if (status & HP_SDC_NMISTATUS_FHS) {
287 read_lock(&hp_sdc.hook_lock);
288 if (hp_sdc.timer != NULL)
289 hp_sdc.timer(irq, dev_id, status, 0);
290 read_unlock(&hp_sdc.hook_lock);
291 } else {
292 /* TODO: pass this on to the HIL handler, or do SAK here? */
293 printk(KERN_WARNING PREFIX "HIL NMI\n");
294 }
295#endif
296
297 return IRQ_HANDLED;
298}
299
300
301/***************** Kernel (tasklet) context functions ****************/
302
303unsigned long hp_sdc_put(void);
304
305static void hp_sdc_tasklet(unsigned long foo)
306{
307 write_lock_irq(&hp_sdc.rtq_lock);
308
309 if (hp_sdc.rcurr >= 0) {
310 struct timeval tv;
311
312 do_gettimeofday(&tv);
313 if (tv.tv_sec > hp_sdc.rtv.tv_sec)
314 tv.tv_usec += USEC_PER_SEC;
315
316 if (tv.tv_usec - hp_sdc.rtv.tv_usec > HP_SDC_MAX_REG_DELAY) {
317 hp_sdc_transaction *curr;
318 uint8_t tmp;
319
320 curr = hp_sdc.tq[hp_sdc.rcurr];
321 /* If this turns out to be a normal failure mode
322 * we'll need to figure out a way to communicate
323 * it back to the application. and be less verbose.
324 */
325 printk(KERN_WARNING PREFIX "read timeout (%ius)!\n",
326 (int)(tv.tv_usec - hp_sdc.rtv.tv_usec));
327 curr->idx += hp_sdc.rqty;
328 hp_sdc.rqty = 0;
329 tmp = curr->seq[curr->actidx];
330 curr->seq[curr->actidx] |= HP_SDC_ACT_DEAD;
331 if (tmp & HP_SDC_ACT_SEMAPHORE)
332 if (curr->act.semaphore)
333 up(curr->act.semaphore);
334
335 if (tmp & HP_SDC_ACT_CALLBACK) {
336 /* Note this means that irqhooks may be called
337 * in tasklet/bh context.
338 */
339 if (curr->act.irqhook)
340 curr->act.irqhook(0, NULL, 0, 0);
341 }
342
343 curr->actidx = curr->idx;
344 curr->idx++;
345 hp_sdc.rcurr = -1;
346 }
347 }
348 write_unlock_irq(&hp_sdc.rtq_lock);
349 hp_sdc_put();
350}
351
352unsigned long hp_sdc_put(void)
353{
354 hp_sdc_transaction *curr;
355 uint8_t act;
356 int idx, curridx;
357
358 int limit = 0;
359
360 write_lock(&hp_sdc.lock);
361
362 /* If i8042 buffers are full, we cannot do anything that
363 requires output, so we skip to the administrativa. */
364 if (hp_sdc.ibf) {
365 hp_sdc_status_in8();
366 if (hp_sdc.ibf)
367 goto finish;
368 }
369
370 anew:
371 /* See if we are in the middle of a sequence. */
372 if (hp_sdc.wcurr < 0)
373 hp_sdc.wcurr = 0;
374 read_lock_irq(&hp_sdc.rtq_lock);
375 if (hp_sdc.rcurr == hp_sdc.wcurr)
376 hp_sdc.wcurr++;
377 read_unlock_irq(&hp_sdc.rtq_lock);
378 if (hp_sdc.wcurr >= HP_SDC_QUEUE_LEN)
379 hp_sdc.wcurr = 0;
380 curridx = hp_sdc.wcurr;
381
382 if (hp_sdc.tq[curridx] != NULL)
383 goto start;
384
385 while (++curridx != hp_sdc.wcurr) {
386 if (curridx >= HP_SDC_QUEUE_LEN) {
387 curridx = -1; /* Wrap to top */
388 continue;
389 }
390 read_lock_irq(&hp_sdc.rtq_lock);
391 if (hp_sdc.rcurr == curridx) {
392 read_unlock_irq(&hp_sdc.rtq_lock);
393 continue;
394 }
395 read_unlock_irq(&hp_sdc.rtq_lock);
396 if (hp_sdc.tq[curridx] != NULL)
397 break; /* Found one. */
398 }
399 if (curridx == hp_sdc.wcurr) { /* There's nothing queued to do. */
400 curridx = -1;
401 }
402 hp_sdc.wcurr = curridx;
403
404 start:
405
406 /* Check to see if the interrupt mask needs to be set. */
407 if (hp_sdc.set_im) {
408 hp_sdc_status_out8(hp_sdc.im | HP_SDC_CMD_SET_IM);
409 hp_sdc.set_im = 0;
410 goto finish;
411 }
412
413 if (hp_sdc.wcurr == -1)
414 goto done;
415
416 curr = hp_sdc.tq[curridx];
417 idx = curr->actidx;
418
419 if (curr->actidx >= curr->endidx) {
420 hp_sdc.tq[curridx] = NULL;
421 /* Interleave outbound data between the transactions. */
422 hp_sdc.wcurr++;
423 if (hp_sdc.wcurr >= HP_SDC_QUEUE_LEN)
424 hp_sdc.wcurr = 0;
425 goto finish;
426 }
427
428 act = curr->seq[idx];
429 idx++;
430
431 if (curr->idx >= curr->endidx) {
432 if (act & HP_SDC_ACT_DEALLOC)
433 kfree(curr);
434 hp_sdc.tq[curridx] = NULL;
435 /* Interleave outbound data between the transactions. */
436 hp_sdc.wcurr++;
437 if (hp_sdc.wcurr >= HP_SDC_QUEUE_LEN)
438 hp_sdc.wcurr = 0;
439 goto finish;
440 }
441
442 while (act & HP_SDC_ACT_PRECMD) {
443 if (curr->idx != idx) {
444 idx++;
445 act &= ~HP_SDC_ACT_PRECMD;
446 break;
447 }
448 hp_sdc_status_out8(curr->seq[idx]);
449 curr->idx++;
450 /* act finished? */
451 if ((act & HP_SDC_ACT_DURING) == HP_SDC_ACT_PRECMD)
452 goto actdone;
453 /* skip quantity field if data-out sequence follows. */
454 if (act & HP_SDC_ACT_DATAOUT)
455 curr->idx++;
456 goto finish;
457 }
458 if (act & HP_SDC_ACT_DATAOUT) {
459 int qty;
460
461 qty = curr->seq[idx];
462 idx++;
463 if (curr->idx - idx < qty) {
464 hp_sdc_data_out8(curr->seq[curr->idx]);
465 curr->idx++;
466 /* act finished? */
467 if (curr->idx - idx >= qty &&
468 (act & HP_SDC_ACT_DURING) == HP_SDC_ACT_DATAOUT)
469 goto actdone;
470 goto finish;
471 }
472 idx += qty;
473 act &= ~HP_SDC_ACT_DATAOUT;
474 } else
475 while (act & HP_SDC_ACT_DATAREG) {
476 int mask;
477 uint8_t w7[4];
478
479 mask = curr->seq[idx];
480 if (idx != curr->idx) {
481 idx++;
482 idx += !!(mask & 1);
483 idx += !!(mask & 2);
484 idx += !!(mask & 4);
485 idx += !!(mask & 8);
486 act &= ~HP_SDC_ACT_DATAREG;
487 break;
488 }
489
490 w7[0] = (mask & 1) ? curr->seq[++idx] : hp_sdc.r7[0];
491 w7[1] = (mask & 2) ? curr->seq[++idx] : hp_sdc.r7[1];
492 w7[2] = (mask & 4) ? curr->seq[++idx] : hp_sdc.r7[2];
493 w7[3] = (mask & 8) ? curr->seq[++idx] : hp_sdc.r7[3];
494
495 if (hp_sdc.wi > 0x73 || hp_sdc.wi < 0x70 ||
496 w7[hp_sdc.wi - 0x70] == hp_sdc.r7[hp_sdc.wi - 0x70]) {
497 int i = 0;
498
499 /* Need to point the write index register */
500 while (i < 4 && w7[i] == hp_sdc.r7[i])
501 i++;
502
503 if (i < 4) {
504 hp_sdc_status_out8(HP_SDC_CMD_SET_D0 + i);
505 hp_sdc.wi = 0x70 + i;
506 goto finish;
507 }
508
509 idx++;
510 if ((act & HP_SDC_ACT_DURING) == HP_SDC_ACT_DATAREG)
511 goto actdone;
512
513 curr->idx = idx;
514 act &= ~HP_SDC_ACT_DATAREG;
515 break;
516 }
517
518 hp_sdc_data_out8(w7[hp_sdc.wi - 0x70]);
519 hp_sdc.r7[hp_sdc.wi - 0x70] = w7[hp_sdc.wi - 0x70];
520 hp_sdc.wi++; /* write index register autoincrements */
521 {
522 int i = 0;
523
524 while ((i < 4) && w7[i] == hp_sdc.r7[i])
525 i++;
526 if (i >= 4) {
527 curr->idx = idx + 1;
528 if ((act & HP_SDC_ACT_DURING) ==
529 HP_SDC_ACT_DATAREG)
530 goto actdone;
531 }
532 }
533 goto finish;
534 }
535 /* We don't go any further in the command if there is a pending read,
536 because we don't want interleaved results. */
537 read_lock_irq(&hp_sdc.rtq_lock);
538 if (hp_sdc.rcurr >= 0) {
539 read_unlock_irq(&hp_sdc.rtq_lock);
540 goto finish;
541 }
542 read_unlock_irq(&hp_sdc.rtq_lock);
543
544
545 if (act & HP_SDC_ACT_POSTCMD) {
546 uint8_t postcmd;
547
548 /* curr->idx should == idx at this point. */
549 postcmd = curr->seq[idx];
550 curr->idx++;
551 if (act & HP_SDC_ACT_DATAIN) {
552
553 /* Start a new read */
554 hp_sdc.rqty = curr->seq[curr->idx];
555 do_gettimeofday(&hp_sdc.rtv);
556 curr->idx++;
557 /* Still need to lock here in case of spurious irq. */
558 write_lock_irq(&hp_sdc.rtq_lock);
559 hp_sdc.rcurr = curridx;
560 write_unlock_irq(&hp_sdc.rtq_lock);
561 hp_sdc_status_out8(postcmd);
562 goto finish;
563 }
564 hp_sdc_status_out8(postcmd);
565 goto actdone;
566 }
567
568 actdone:
569 if (act & HP_SDC_ACT_SEMAPHORE)
570 up(curr->act.semaphore);
571 else if (act & HP_SDC_ACT_CALLBACK)
572 curr->act.irqhook(0,NULL,0,0);
573
574 if (curr->idx >= curr->endidx) { /* This transaction is over. */
575 if (act & HP_SDC_ACT_DEALLOC)
576 kfree(curr);
577 hp_sdc.tq[curridx] = NULL;
578 } else {
579 curr->actidx = idx + 1;
580 curr->idx = idx + 2;
581 }
582 /* Interleave outbound data between the transactions. */
583 hp_sdc.wcurr++;
584 if (hp_sdc.wcurr >= HP_SDC_QUEUE_LEN)
585 hp_sdc.wcurr = 0;
586
587 finish:
588 /* If by some quirk IBF has cleared and our ISR has run to
589 see that that has happened, do it all again. */
590 if (!hp_sdc.ibf && limit++ < 20)
591 goto anew;
592
593 done:
594 if (hp_sdc.wcurr >= 0)
595 tasklet_schedule(&hp_sdc.task);
596 write_unlock(&hp_sdc.lock);
597
598 return 0;
599}
600
601/******* Functions called in either user or kernel context ****/
602int __hp_sdc_enqueue_transaction(hp_sdc_transaction *this)
603{
604 int i;
605
606 if (this == NULL) {
607 BUG();
608 return -EINVAL;
609 }
610
611 /* Can't have same transaction on queue twice */
612 for (i = 0; i < HP_SDC_QUEUE_LEN; i++)
613 if (hp_sdc.tq[i] == this)
614 goto fail;
615
616 this->actidx = 0;
617 this->idx = 1;
618
619 /* Search for empty slot */
620 for (i = 0; i < HP_SDC_QUEUE_LEN; i++)
621 if (hp_sdc.tq[i] == NULL) {
622 hp_sdc.tq[i] = this;
623 tasklet_schedule(&hp_sdc.task);
624 return 0;
625 }
626
627 printk(KERN_WARNING PREFIX "No free slot to add transaction.\n");
628 return -EBUSY;
629
630 fail:
631 printk(KERN_WARNING PREFIX "Transaction add failed: transaction already queued?\n");
632 return -EINVAL;
633}
634
635int hp_sdc_enqueue_transaction(hp_sdc_transaction *this) {
636 unsigned long flags;
637 int ret;
638
639 write_lock_irqsave(&hp_sdc.lock, flags);
640 ret = __hp_sdc_enqueue_transaction(this);
641 write_unlock_irqrestore(&hp_sdc.lock,flags);
642
643 return ret;
644}
645
646int hp_sdc_dequeue_transaction(hp_sdc_transaction *this)
647{
648 unsigned long flags;
649 int i;
650
651 write_lock_irqsave(&hp_sdc.lock, flags);
652
653 /* TODO: don't remove it if it's not done. */
654
655 for (i = 0; i < HP_SDC_QUEUE_LEN; i++)
656 if (hp_sdc.tq[i] == this)
657 hp_sdc.tq[i] = NULL;
658
659 write_unlock_irqrestore(&hp_sdc.lock, flags);
660 return 0;
661}
662
663
664
665/********************** User context functions **************************/
666int hp_sdc_request_timer_irq(hp_sdc_irqhook *callback)
667{
668 if (callback == NULL || hp_sdc.dev == NULL)
669 return -EINVAL;
670
671 write_lock_irq(&hp_sdc.hook_lock);
672 if (hp_sdc.timer != NULL) {
673 write_unlock_irq(&hp_sdc.hook_lock);
674 return -EBUSY;
675 }
676
677 hp_sdc.timer = callback;
678 /* Enable interrupts from the timers */
679 hp_sdc.im &= ~HP_SDC_IM_FH;
680 hp_sdc.im &= ~HP_SDC_IM_PT;
681 hp_sdc.im &= ~HP_SDC_IM_TIMERS;
682 hp_sdc.set_im = 1;
683 write_unlock_irq(&hp_sdc.hook_lock);
684
685 tasklet_schedule(&hp_sdc.task);
686
687 return 0;
688}
689
690int hp_sdc_request_hil_irq(hp_sdc_irqhook *callback)
691{
692 if (callback == NULL || hp_sdc.dev == NULL)
693 return -EINVAL;
694
695 write_lock_irq(&hp_sdc.hook_lock);
696 if (hp_sdc.hil != NULL) {
697 write_unlock_irq(&hp_sdc.hook_lock);
698 return -EBUSY;
699 }
700
701 hp_sdc.hil = callback;
702 hp_sdc.im &= ~(HP_SDC_IM_HIL | HP_SDC_IM_RESET);
703 hp_sdc.set_im = 1;
704 write_unlock_irq(&hp_sdc.hook_lock);
705
706 tasklet_schedule(&hp_sdc.task);
707
708 return 0;
709}
710
711int hp_sdc_request_cooked_irq(hp_sdc_irqhook *callback)
712{
713 if (callback == NULL || hp_sdc.dev == NULL)
714 return -EINVAL;
715
716 write_lock_irq(&hp_sdc.hook_lock);
717 if (hp_sdc.cooked != NULL) {
718 write_unlock_irq(&hp_sdc.hook_lock);
719 return -EBUSY;
720 }
721
722 /* Enable interrupts from the HIL MLC */
723 hp_sdc.cooked = callback;
724 hp_sdc.im &= ~(HP_SDC_IM_HIL | HP_SDC_IM_RESET);
725 hp_sdc.set_im = 1;
726 write_unlock_irq(&hp_sdc.hook_lock);
727
728 tasklet_schedule(&hp_sdc.task);
729
730 return 0;
731}
732
733int hp_sdc_release_timer_irq(hp_sdc_irqhook *callback)
734{
735 write_lock_irq(&hp_sdc.hook_lock);
736 if ((callback != hp_sdc.timer) ||
737 (hp_sdc.timer == NULL)) {
738 write_unlock_irq(&hp_sdc.hook_lock);
739 return -EINVAL;
740 }
741
742 /* Disable interrupts from the timers */
743 hp_sdc.timer = NULL;
744 hp_sdc.im |= HP_SDC_IM_TIMERS;
745 hp_sdc.im |= HP_SDC_IM_FH;
746 hp_sdc.im |= HP_SDC_IM_PT;
747 hp_sdc.set_im = 1;
748 write_unlock_irq(&hp_sdc.hook_lock);
749 tasklet_schedule(&hp_sdc.task);
750
751 return 0;
752}
753
754int hp_sdc_release_hil_irq(hp_sdc_irqhook *callback)
755{
756 write_lock_irq(&hp_sdc.hook_lock);
757 if ((callback != hp_sdc.hil) ||
758 (hp_sdc.hil == NULL)) {
759 write_unlock_irq(&hp_sdc.hook_lock);
760 return -EINVAL;
761 }
762
763 hp_sdc.hil = NULL;
764 /* Disable interrupts from HIL only if there is no cooked driver. */
765 if(hp_sdc.cooked == NULL) {
766 hp_sdc.im |= (HP_SDC_IM_HIL | HP_SDC_IM_RESET);
767 hp_sdc.set_im = 1;
768 }
769 write_unlock_irq(&hp_sdc.hook_lock);
770 tasklet_schedule(&hp_sdc.task);
771
772 return 0;
773}
774
775int hp_sdc_release_cooked_irq(hp_sdc_irqhook *callback)
776{
777 write_lock_irq(&hp_sdc.hook_lock);
778 if ((callback != hp_sdc.cooked) ||
779 (hp_sdc.cooked == NULL)) {
780 write_unlock_irq(&hp_sdc.hook_lock);
781 return -EINVAL;
782 }
783
784 hp_sdc.cooked = NULL;
785 /* Disable interrupts from HIL only if there is no raw HIL driver. */
786 if(hp_sdc.hil == NULL) {
787 hp_sdc.im |= (HP_SDC_IM_HIL | HP_SDC_IM_RESET);
788 hp_sdc.set_im = 1;
789 }
790 write_unlock_irq(&hp_sdc.hook_lock);
791 tasklet_schedule(&hp_sdc.task);
792
793 return 0;
794}
795
796/************************* Keepalive timer task *********************/
797
798static void hp_sdc_kicker(unsigned long data)
799{
800 tasklet_schedule(&hp_sdc.task);
801 /* Re-insert the periodic task. */
802 mod_timer(&hp_sdc.kicker, jiffies + HZ);
803}
804
805/************************** Module Initialization ***************************/
806
807#if defined(__hppa__)
808
809static const struct parisc_device_id hp_sdc_tbl[] = {
810 {
811 .hw_type = HPHW_FIO,
812 .hversion_rev = HVERSION_REV_ANY_ID,
813 .hversion = HVERSION_ANY_ID,
814 .sversion = 0x73,
815 },
816 { 0, }
817};
818
819MODULE_DEVICE_TABLE(parisc, hp_sdc_tbl);
820
821static int __init hp_sdc_init_hppa(struct parisc_device *d);
822static struct delayed_work moduleloader_work;
823
824static struct parisc_driver hp_sdc_driver = {
825 .name = "hp_sdc",
826 .id_table = hp_sdc_tbl,
827 .probe = hp_sdc_init_hppa,
828};
829
830#endif /* __hppa__ */
831
832static int __init hp_sdc_init(void)
833{
834 char *errstr;
835 hp_sdc_transaction t_sync;
836 uint8_t ts_sync[6];
837 struct semaphore s_sync;
838
839 rwlock_init(&hp_sdc.lock);
840 rwlock_init(&hp_sdc.ibf_lock);
841 rwlock_init(&hp_sdc.rtq_lock);
842 rwlock_init(&hp_sdc.hook_lock);
843
844 hp_sdc.timer = NULL;
845 hp_sdc.hil = NULL;
846 hp_sdc.pup = NULL;
847 hp_sdc.cooked = NULL;
848 hp_sdc.im = HP_SDC_IM_MASK; /* Mask maskable irqs */
849 hp_sdc.set_im = 1;
850 hp_sdc.wi = 0xff;
851 hp_sdc.r7[0] = 0xff;
852 hp_sdc.r7[1] = 0xff;
853 hp_sdc.r7[2] = 0xff;
854 hp_sdc.r7[3] = 0xff;
855 hp_sdc.ibf = 1;
856
857 memset(&hp_sdc.tq, 0, sizeof(hp_sdc.tq));
858
859 hp_sdc.wcurr = -1;
860 hp_sdc.rcurr = -1;
861 hp_sdc.rqty = 0;
862
863 hp_sdc.dev_err = -ENODEV;
864
865 errstr = "IO not found for";
866 if (!hp_sdc.base_io)
867 goto err0;
868
869 errstr = "IRQ not found for";
870 if (!hp_sdc.irq)
871 goto err0;
872
873 hp_sdc.dev_err = -EBUSY;
874
875#if defined(__hppa__)
876 errstr = "IO not available for";
877 if (request_region(hp_sdc.data_io, 2, hp_sdc_driver.name))
878 goto err0;
879#endif
880
881 errstr = "IRQ not available for";
882 if (request_irq(hp_sdc.irq, &hp_sdc_isr, IRQF_SHARED|IRQF_SAMPLE_RANDOM,
883 "HP SDC", &hp_sdc))
884 goto err1;
885
886 errstr = "NMI not available for";
887 if (request_irq(hp_sdc.nmi, &hp_sdc_nmisr, IRQF_SHARED,
888 "HP SDC NMI", &hp_sdc))
889 goto err2;
890
891 printk(KERN_INFO PREFIX "HP SDC at 0x%p, IRQ %d (NMI IRQ %d)\n",
892 (void *)hp_sdc.base_io, hp_sdc.irq, hp_sdc.nmi);
893
894 hp_sdc_status_in8();
895 hp_sdc_data_in8();
896
897 tasklet_init(&hp_sdc.task, hp_sdc_tasklet, 0);
898
899 /* Sync the output buffer registers, thus scheduling hp_sdc_tasklet. */
900 t_sync.actidx = 0;
901 t_sync.idx = 1;
902 t_sync.endidx = 6;
903 t_sync.seq = ts_sync;
904 ts_sync[0] = HP_SDC_ACT_DATAREG | HP_SDC_ACT_SEMAPHORE;
905 ts_sync[1] = 0x0f;
906 ts_sync[2] = ts_sync[3] = ts_sync[4] = ts_sync[5] = 0;
907 t_sync.act.semaphore = &s_sync;
908 sema_init(&s_sync, 0);
909 hp_sdc_enqueue_transaction(&t_sync);
910 down(&s_sync); /* Wait for t_sync to complete */
911
912 /* Create the keepalive task */
913 init_timer(&hp_sdc.kicker);
914 hp_sdc.kicker.expires = jiffies + HZ;
915 hp_sdc.kicker.function = &hp_sdc_kicker;
916 add_timer(&hp_sdc.kicker);
917
918 hp_sdc.dev_err = 0;
919 return 0;
920 err2:
921 free_irq(hp_sdc.irq, &hp_sdc);
922 err1:
923 release_region(hp_sdc.data_io, 2);
924 err0:
925 printk(KERN_WARNING PREFIX ": %s SDC IO=0x%p IRQ=0x%x NMI=0x%x\n",
926 errstr, (void *)hp_sdc.base_io, hp_sdc.irq, hp_sdc.nmi);
927 hp_sdc.dev = NULL;
928
929 return hp_sdc.dev_err;
930}
931
932#if defined(__hppa__)
933
934static void request_module_delayed(struct work_struct *work)
935{
936 request_module("hp_sdc_mlc");
937}
938
939static int __init hp_sdc_init_hppa(struct parisc_device *d)
940{
941 int ret;
942
943 if (!d)
944 return 1;
945 if (hp_sdc.dev != NULL)
946 return 1; /* We only expect one SDC */
947
948 hp_sdc.dev = d;
949 hp_sdc.irq = d->irq;
950 hp_sdc.nmi = d->aux_irq;
951 hp_sdc.base_io = d->hpa.start;
952 hp_sdc.data_io = d->hpa.start + 0x800;
953 hp_sdc.status_io = d->hpa.start + 0x801;
954
955 INIT_DELAYED_WORK(&moduleloader_work, request_module_delayed);
956
957 ret = hp_sdc_init();
958 /* after successful initialization give SDC some time to settle
959 * and then load the hp_sdc_mlc upper layer driver */
960 if (!ret)
961 schedule_delayed_work(&moduleloader_work,
962 msecs_to_jiffies(2000));
963
964 return ret;
965}
966
967#endif /* __hppa__ */
968
969static void hp_sdc_exit(void)
970{
971 /* do nothing if we don't have a SDC */
972 if (!hp_sdc.dev)
973 return;
974
975 write_lock_irq(&hp_sdc.lock);
976
977 /* Turn off all maskable "sub-function" irq's. */
978 hp_sdc_spin_ibf();
979 sdc_writeb(HP_SDC_CMD_SET_IM | HP_SDC_IM_MASK, hp_sdc.status_io);
980
981 /* Wait until we know this has been processed by the i8042 */
982 hp_sdc_spin_ibf();
983
984 free_irq(hp_sdc.nmi, &hp_sdc);
985 free_irq(hp_sdc.irq, &hp_sdc);
986 write_unlock_irq(&hp_sdc.lock);
987
988 del_timer(&hp_sdc.kicker);
989
990 tasklet_kill(&hp_sdc.task);
991
992#if defined(__hppa__)
993 cancel_delayed_work_sync(&moduleloader_work);
994 if (unregister_parisc_driver(&hp_sdc_driver))
995 printk(KERN_WARNING PREFIX "Error unregistering HP SDC");
996#endif
997}
998
999static int __init hp_sdc_register(void)
1000{
1001 hp_sdc_transaction tq_init;
1002 uint8_t tq_init_seq[5];
1003 struct semaphore tq_init_sem;
1004#if defined(__mc68000__)
1005 mm_segment_t fs;
1006 unsigned char i;
1007#endif
1008
1009 if (hp_sdc_disabled) {
1010 printk(KERN_WARNING PREFIX "HP SDC driver disabled by no_hpsdc=1.\n");
1011 return -ENODEV;
1012 }
1013
1014 hp_sdc.dev = NULL;
1015 hp_sdc.dev_err = 0;
1016#if defined(__hppa__)
1017 if (register_parisc_driver(&hp_sdc_driver)) {
1018 printk(KERN_WARNING PREFIX "Error registering SDC with system bus tree.\n");
1019 return -ENODEV;
1020 }
1021#elif defined(__mc68000__)
1022 if (!MACH_IS_HP300)
1023 return -ENODEV;
1024
1025 hp_sdc.irq = 1;
1026 hp_sdc.nmi = 7;
1027 hp_sdc.base_io = (unsigned long) 0xf0428000;
1028 hp_sdc.data_io = (unsigned long) hp_sdc.base_io + 1;
1029 hp_sdc.status_io = (unsigned long) hp_sdc.base_io + 3;
1030 fs = get_fs();
1031 set_fs(KERNEL_DS);
1032 if (!get_user(i, (unsigned char *)hp_sdc.data_io))
1033 hp_sdc.dev = (void *)1;
1034 set_fs(fs);
1035 hp_sdc.dev_err = hp_sdc_init();
1036#endif
1037 if (hp_sdc.dev == NULL) {
1038 printk(KERN_WARNING PREFIX "No SDC found.\n");
1039 return hp_sdc.dev_err;
1040 }
1041
1042 sema_init(&tq_init_sem, 0);
1043
1044 tq_init.actidx = 0;
1045 tq_init.idx = 1;
1046 tq_init.endidx = 5;
1047 tq_init.seq = tq_init_seq;
1048 tq_init.act.semaphore = &tq_init_sem;
1049
1050 tq_init_seq[0] =
1051 HP_SDC_ACT_POSTCMD | HP_SDC_ACT_DATAIN | HP_SDC_ACT_SEMAPHORE;
1052 tq_init_seq[1] = HP_SDC_CMD_READ_KCC;
1053 tq_init_seq[2] = 1;
1054 tq_init_seq[3] = 0;
1055 tq_init_seq[4] = 0;
1056
1057 hp_sdc_enqueue_transaction(&tq_init);
1058
1059 down(&tq_init_sem);
1060 up(&tq_init_sem);
1061
1062 if ((tq_init_seq[0] & HP_SDC_ACT_DEAD) == HP_SDC_ACT_DEAD) {
1063 printk(KERN_WARNING PREFIX "Error reading config byte.\n");
1064 hp_sdc_exit();
1065 return -ENODEV;
1066 }
1067 hp_sdc.r11 = tq_init_seq[4];
1068 if (hp_sdc.r11 & HP_SDC_CFG_NEW) {
1069 const char *str;
1070 printk(KERN_INFO PREFIX "New style SDC\n");
1071 tq_init_seq[1] = HP_SDC_CMD_READ_XTD;
1072 tq_init.actidx = 0;
1073 tq_init.idx = 1;
1074 down(&tq_init_sem);
1075 hp_sdc_enqueue_transaction(&tq_init);
1076 down(&tq_init_sem);
1077 up(&tq_init_sem);
1078 if ((tq_init_seq[0] & HP_SDC_ACT_DEAD) == HP_SDC_ACT_DEAD) {
1079 printk(KERN_WARNING PREFIX "Error reading extended config byte.\n");
1080 return -ENODEV;
1081 }
1082 hp_sdc.r7e = tq_init_seq[4];
1083 HP_SDC_XTD_REV_STRINGS(hp_sdc.r7e & HP_SDC_XTD_REV, str)
1084 printk(KERN_INFO PREFIX "Revision: %s\n", str);
1085 if (hp_sdc.r7e & HP_SDC_XTD_BEEPER)
1086 printk(KERN_INFO PREFIX "TI SN76494 beeper present\n");
1087 if (hp_sdc.r7e & HP_SDC_XTD_BBRTC)
1088 printk(KERN_INFO PREFIX "OKI MSM-58321 BBRTC present\n");
1089 printk(KERN_INFO PREFIX "Spunking the self test register to force PUP "
1090 "on next firmware reset.\n");
1091 tq_init_seq[0] = HP_SDC_ACT_PRECMD |
1092 HP_SDC_ACT_DATAOUT | HP_SDC_ACT_SEMAPHORE;
1093 tq_init_seq[1] = HP_SDC_CMD_SET_STR;
1094 tq_init_seq[2] = 1;
1095 tq_init_seq[3] = 0;
1096 tq_init.actidx = 0;
1097 tq_init.idx = 1;
1098 tq_init.endidx = 4;
1099 down(&tq_init_sem);
1100 hp_sdc_enqueue_transaction(&tq_init);
1101 down(&tq_init_sem);
1102 up(&tq_init_sem);
1103 } else
1104 printk(KERN_INFO PREFIX "Old style SDC (1820-%s).\n",
1105 (hp_sdc.r11 & HP_SDC_CFG_REV) ? "3300" : "2564/3087");
1106
1107 return 0;
1108}
1109
1110module_init(hp_sdc_register);
1111module_exit(hp_sdc_exit);
1112
1113/* Timing notes: These measurements taken on my 64MHz 7100-LC (715/64)
1114 * cycles cycles-adj time
1115 * between two consecutive mfctl(16)'s: 4 n/a 63ns
1116 * hp_sdc_spin_ibf when idle: 119 115 1.7us
1117 * gsc_writeb status register: 83 79 1.2us
1118 * IBF to clear after sending SET_IM: 6204 6006 93us
1119 * IBF to clear after sending LOAD_RT: 4467 4352 68us
1120 * IBF to clear after sending two LOAD_RTs: 18974 18859 295us
1121 * READ_T1, read status/data, IRQ, call handler: 35564 n/a 556us
1122 * cmd to ~IBF READ_T1 2nd time right after: 5158403 n/a 81ms
1123 * between IRQ received and ~IBF for above: 2578877 n/a 40ms
1124 *
1125 * Performance stats after a run of this module configuring HIL and
1126 * receiving a few mouse events:
1127 *
1128 * status in8 282508 cycles 7128 calls
1129 * status out8 8404 cycles 341 calls
1130 * data out8 1734 cycles 78 calls
1131 * isr 174324 cycles 617 calls (includes take)
1132 * take 1241 cycles 2 calls
1133 * put 1411504 cycles 6937 calls
1134 * task 1655209 cycles 6937 calls (includes put)
1135 *
1136 */