1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Device driver for the Cuda and Egret system controllers found on PowerMacs
4 * and 68k Macs.
5 *
6 * The Cuda or Egret is a 6805 microcontroller interfaced to the 6522 VIA.
7 * This MCU controls system power, Parameter RAM, Real Time Clock and the
8 * Apple Desktop Bus (ADB) that connects to the keyboard and mouse.
9 *
10 * Copyright (C) 1996 Paul Mackerras.
11 */
12 #include <stdarg.h>
13 #include <linux/types.h>
14 #include <linux/errno.h>
15 #include <linux/kernel.h>
16 #include <linux/delay.h>
17 #include <linux/adb.h>
18 #include <linux/cuda.h>
19 #include <linux/spinlock.h>
20 #include <linux/interrupt.h>
21 #ifdef CONFIG_PPC
22 #include <asm/prom.h>
23 #include <asm/machdep.h>
24 #else
25 #include <asm/macintosh.h>
26 #include <asm/macints.h>
27 #include <asm/mac_via.h>
28 #endif
29 #include <asm/io.h>
30 #include <linux/init.h>
31
32 static volatile unsigned char __iomem *via;
33 static DEFINE_SPINLOCK(cuda_lock);
34
35 /* VIA registers - spaced 0x200 bytes apart */
36 #define RS 0x200 /* skip between registers */
37 #define B 0 /* B-side data */
38 #define A RS /* A-side data */
39 #define DIRB (2*RS) /* B-side direction (1=output) */
40 #define DIRA (3*RS) /* A-side direction (1=output) */
41 #define T1CL (4*RS) /* Timer 1 ctr/latch (low 8 bits) */
42 #define T1CH (5*RS) /* Timer 1 counter (high 8 bits) */
43 #define T1LL (6*RS) /* Timer 1 latch (low 8 bits) */
44 #define T1LH (7*RS) /* Timer 1 latch (high 8 bits) */
45 #define T2CL (8*RS) /* Timer 2 ctr/latch (low 8 bits) */
46 #define T2CH (9*RS) /* Timer 2 counter (high 8 bits) */
47 #define SR (10*RS) /* Shift register */
48 #define ACR (11*RS) /* Auxiliary control register */
49 #define PCR (12*RS) /* Peripheral control register */
50 #define IFR (13*RS) /* Interrupt flag register */
51 #define IER (14*RS) /* Interrupt enable register */
52 #define ANH (15*RS) /* A-side data, no handshake */
53
54 /*
55 * When the Cuda design replaced the Egret, some signal names and
56 * logic sense changed. They all serve the same purposes, however.
57 *
58 * VIA pin | Egret pin
59 * ----------------+------------------------------------------
60 * PB3 (input) | Transceiver session (active low)
61 * PB4 (output) | VIA full (active high)
62 * PB5 (output) | System session (active high)
63 *
64 * VIA pin | Cuda pin
65 * ----------------+------------------------------------------
66 * PB3 (input) | Transfer request (active low)
67 * PB4 (output) | Byte acknowledge (active low)
68 * PB5 (output) | Transfer in progress (active low)
69 */
70
71 /* Bits in Port B data register */
72 #define TREQ 0x08 /* Transfer request */
73 #define TACK 0x10 /* Transfer acknowledge */
74 #define TIP 0x20 /* Transfer in progress */
75
76 /* Bits in ACR */
77 #define SR_CTRL 0x1c /* Shift register control bits */
78 #define SR_EXT 0x0c /* Shift on external clock */
79 #define SR_OUT 0x10 /* Shift out if 1 */
80
81 /* Bits in IFR and IER */
82 #define IER_SET 0x80 /* set bits in IER */
83 #define IER_CLR 0 /* clear bits in IER */
84 #define SR_INT 0x04 /* Shift register full/empty */
85
86 /* Duration of byte acknowledgement pulse (us) */
87 #define EGRET_TACK_ASSERTED_DELAY 300
88 #define EGRET_TACK_NEGATED_DELAY 400
89
90 /* Interval from interrupt to start of session (us) */
91 #define EGRET_SESSION_DELAY 450
92
93 #ifdef CONFIG_PPC
94 #define mcu_is_egret false
95 #else
96 static bool mcu_is_egret;
97 #endif
98
TREQ_asserted(u8 portb)99 static inline bool TREQ_asserted(u8 portb)
100 {
101 return !(portb & TREQ);
102 }
103
assert_TIP(void)104 static inline void assert_TIP(void)
105 {
106 if (mcu_is_egret) {
107 udelay(EGRET_SESSION_DELAY);
108 out_8(&via[B], in_8(&via[B]) | TIP);
109 } else
110 out_8(&via[B], in_8(&via[B]) & ~TIP);
111 }
112
assert_TIP_and_TACK(void)113 static inline void assert_TIP_and_TACK(void)
114 {
115 if (mcu_is_egret) {
116 udelay(EGRET_SESSION_DELAY);
117 out_8(&via[B], in_8(&via[B]) | TIP | TACK);
118 } else
119 out_8(&via[B], in_8(&via[B]) & ~(TIP | TACK));
120 }
121
assert_TACK(void)122 static inline void assert_TACK(void)
123 {
124 if (mcu_is_egret) {
125 udelay(EGRET_TACK_NEGATED_DELAY);
126 out_8(&via[B], in_8(&via[B]) | TACK);
127 } else
128 out_8(&via[B], in_8(&via[B]) & ~TACK);
129 }
130
toggle_TACK(void)131 static inline void toggle_TACK(void)
132 {
133 out_8(&via[B], in_8(&via[B]) ^ TACK);
134 }
135
negate_TACK(void)136 static inline void negate_TACK(void)
137 {
138 if (mcu_is_egret) {
139 udelay(EGRET_TACK_ASSERTED_DELAY);
140 out_8(&via[B], in_8(&via[B]) & ~TACK);
141 } else
142 out_8(&via[B], in_8(&via[B]) | TACK);
143 }
144
negate_TIP_and_TACK(void)145 static inline void negate_TIP_and_TACK(void)
146 {
147 if (mcu_is_egret) {
148 udelay(EGRET_TACK_ASSERTED_DELAY);
149 out_8(&via[B], in_8(&via[B]) & ~(TIP | TACK));
150 } else
151 out_8(&via[B], in_8(&via[B]) | TIP | TACK);
152 }
153
154 static enum cuda_state {
155 idle,
156 sent_first_byte,
157 sending,
158 reading,
159 read_done,
160 awaiting_reply
161 } cuda_state;
162
163 static struct adb_request *current_req;
164 static struct adb_request *last_req;
165 static unsigned char cuda_rbuf[16];
166 static unsigned char *reply_ptr;
167 static int reading_reply;
168 static int data_index;
169 static int cuda_irq;
170 #ifdef CONFIG_PPC
171 static struct device_node *vias;
172 #endif
173 static int cuda_fully_inited;
174
175 #ifdef CONFIG_ADB
176 static int cuda_probe(void);
177 static int cuda_send_request(struct adb_request *req, int sync);
178 static int cuda_adb_autopoll(int devs);
179 static int cuda_reset_adb_bus(void);
180 #endif /* CONFIG_ADB */
181
182 static int cuda_init_via(void);
183 static void cuda_start(void);
184 static irqreturn_t cuda_interrupt(int irq, void *arg);
185 static void cuda_input(unsigned char *buf, int nb);
186 void cuda_poll(void);
187 static int cuda_write(struct adb_request *req);
188
189 int cuda_request(struct adb_request *req,
190 void (*done)(struct adb_request *), int nbytes, ...);
191
192 #ifdef CONFIG_ADB
193 struct adb_driver via_cuda_driver = {
194 .name = "CUDA",
195 .probe = cuda_probe,
196 .send_request = cuda_send_request,
197 .autopoll = cuda_adb_autopoll,
198 .poll = cuda_poll,
199 .reset_bus = cuda_reset_adb_bus,
200 };
201 #endif /* CONFIG_ADB */
202
203 #ifdef CONFIG_MAC
find_via_cuda(void)204 int __init find_via_cuda(void)
205 {
206 struct adb_request req;
207 int err;
208
209 if (macintosh_config->adb_type != MAC_ADB_CUDA &&
210 macintosh_config->adb_type != MAC_ADB_EGRET)
211 return 0;
212
213 via = via1;
214 cuda_state = idle;
215 mcu_is_egret = macintosh_config->adb_type == MAC_ADB_EGRET;
216
217 err = cuda_init_via();
218 if (err) {
219 printk(KERN_ERR "cuda_init_via() failed\n");
220 via = NULL;
221 return 0;
222 }
223
224 /* enable autopoll */
225 cuda_request(&req, NULL, 3, CUDA_PACKET, CUDA_AUTOPOLL, 1);
226 while (!req.complete)
227 cuda_poll();
228
229 return 1;
230 }
231 #else
find_via_cuda(void)232 int __init find_via_cuda(void)
233 {
234 struct adb_request req;
235 phys_addr_t taddr;
236 const u32 *reg;
237 int err;
238
239 if (vias != 0)
240 return 1;
241 vias = of_find_node_by_name(NULL, "via-cuda");
242 if (vias == 0)
243 return 0;
244
245 reg = of_get_property(vias, "reg", NULL);
246 if (reg == NULL) {
247 printk(KERN_ERR "via-cuda: No \"reg\" property !\n");
248 goto fail;
249 }
250 taddr = of_translate_address(vias, reg);
251 if (taddr == 0) {
252 printk(KERN_ERR "via-cuda: Can't translate address !\n");
253 goto fail;
254 }
255 via = ioremap(taddr, 0x2000);
256 if (via == NULL) {
257 printk(KERN_ERR "via-cuda: Can't map address !\n");
258 goto fail;
259 }
260
261 cuda_state = idle;
262 sys_ctrler = SYS_CTRLER_CUDA;
263
264 err = cuda_init_via();
265 if (err) {
266 printk(KERN_ERR "cuda_init_via() failed\n");
267 via = NULL;
268 return 0;
269 }
270
271 /* Clear and enable interrupts, but only on PPC. On 68K it's done */
272 /* for us by the main VIA driver in arch/m68k/mac/via.c */
273
274 out_8(&via[IFR], 0x7f); /* clear interrupts by writing 1s */
275 out_8(&via[IER], IER_SET|SR_INT); /* enable interrupt from SR */
276
277 /* enable autopoll */
278 cuda_request(&req, NULL, 3, CUDA_PACKET, CUDA_AUTOPOLL, 1);
279 while (!req.complete)
280 cuda_poll();
281
282 return 1;
283
284 fail:
285 of_node_put(vias);
286 vias = NULL;
287 return 0;
288 }
289 #endif /* !defined CONFIG_MAC */
290
via_cuda_start(void)291 static int __init via_cuda_start(void)
292 {
293 if (via == NULL)
294 return -ENODEV;
295
296 #ifdef CONFIG_MAC
297 cuda_irq = IRQ_MAC_ADB;
298 #else
299 cuda_irq = irq_of_parse_and_map(vias, 0);
300 if (!cuda_irq) {
301 printk(KERN_ERR "via-cuda: can't map interrupts for %pOF\n",
302 vias);
303 return -ENODEV;
304 }
305 #endif
306
307 if (request_irq(cuda_irq, cuda_interrupt, 0, "ADB", cuda_interrupt)) {
308 printk(KERN_ERR "via-cuda: can't request irq %d\n", cuda_irq);
309 return -EAGAIN;
310 }
311
312 pr_info("Macintosh Cuda and Egret driver.\n");
313
314 cuda_fully_inited = 1;
315 return 0;
316 }
317
318 device_initcall(via_cuda_start);
319
320 #ifdef CONFIG_ADB
321 static int
cuda_probe(void)322 cuda_probe(void)
323 {
324 #ifdef CONFIG_PPC
325 if (sys_ctrler != SYS_CTRLER_CUDA)
326 return -ENODEV;
327 #else
328 if (macintosh_config->adb_type != MAC_ADB_CUDA &&
329 macintosh_config->adb_type != MAC_ADB_EGRET)
330 return -ENODEV;
331 #endif
332 if (via == NULL)
333 return -ENODEV;
334 return 0;
335 }
336 #endif /* CONFIG_ADB */
337
sync_egret(void)338 static int __init sync_egret(void)
339 {
340 if (TREQ_asserted(in_8(&via[B]))) {
341 /* Complete the inbound transfer */
342 assert_TIP_and_TACK();
343 while (1) {
344 negate_TACK();
345 mdelay(1);
346 (void)in_8(&via[SR]);
347 assert_TACK();
348 if (!TREQ_asserted(in_8(&via[B])))
349 break;
350 }
351 negate_TIP_and_TACK();
352 } else if (in_8(&via[B]) & TIP) {
353 /* Terminate the outbound transfer */
354 negate_TACK();
355 assert_TACK();
356 mdelay(1);
357 negate_TIP_and_TACK();
358 }
359 /* Clear shift register interrupt */
360 if (in_8(&via[IFR]) & SR_INT)
361 (void)in_8(&via[SR]);
362 return 0;
363 }
364
365 #define WAIT_FOR(cond, what) \
366 do { \
367 int x; \
368 for (x = 1000; !(cond); --x) { \
369 if (x == 0) { \
370 pr_err("Timeout waiting for " what "\n"); \
371 return -ENXIO; \
372 } \
373 udelay(100); \
374 } \
375 } while (0)
376
377 static int
cuda_init_via(void)378 __init cuda_init_via(void)
379 {
380 #ifdef CONFIG_PPC
381 out_8(&via[IER], 0x7f); /* disable interrupts from VIA */
382 (void)in_8(&via[IER]);
383 #else
384 out_8(&via[IER], SR_INT); /* disable SR interrupt from VIA */
385 #endif
386
387 out_8(&via[DIRB], (in_8(&via[DIRB]) | TACK | TIP) & ~TREQ); /* TACK & TIP out */
388 out_8(&via[ACR], (in_8(&via[ACR]) & ~SR_CTRL) | SR_EXT); /* SR data in */
389 (void)in_8(&via[SR]); /* clear any left-over data */
390
391 if (mcu_is_egret)
392 return sync_egret();
393
394 negate_TIP_and_TACK();
395
396 /* delay 4ms and then clear any pending interrupt */
397 mdelay(4);
398 (void)in_8(&via[SR]);
399 out_8(&via[IFR], SR_INT);
400
401 /* sync with the CUDA - assert TACK without TIP */
402 assert_TACK();
403
404 /* wait for the CUDA to assert TREQ in response */
405 WAIT_FOR(TREQ_asserted(in_8(&via[B])), "CUDA response to sync");
406
407 /* wait for the interrupt and then clear it */
408 WAIT_FOR(in_8(&via[IFR]) & SR_INT, "CUDA response to sync (2)");
409 (void)in_8(&via[SR]);
410 out_8(&via[IFR], SR_INT);
411
412 /* finish the sync by negating TACK */
413 negate_TACK();
414
415 /* wait for the CUDA to negate TREQ and the corresponding interrupt */
416 WAIT_FOR(!TREQ_asserted(in_8(&via[B])), "CUDA response to sync (3)");
417 WAIT_FOR(in_8(&via[IFR]) & SR_INT, "CUDA response to sync (4)");
418 (void)in_8(&via[SR]);
419 out_8(&via[IFR], SR_INT);
420
421 return 0;
422 }
423
424 #ifdef CONFIG_ADB
425 /* Send an ADB command */
426 static int
cuda_send_request(struct adb_request * req,int sync)427 cuda_send_request(struct adb_request *req, int sync)
428 {
429 int i;
430
431 if ((via == NULL) || !cuda_fully_inited) {
432 req->complete = 1;
433 return -ENXIO;
434 }
435
436 req->reply_expected = 1;
437
438 i = cuda_write(req);
439 if (i)
440 return i;
441
442 if (sync) {
443 while (!req->complete)
444 cuda_poll();
445 }
446 return 0;
447 }
448
449
450 /* Enable/disable autopolling */
451 static int
cuda_adb_autopoll(int devs)452 cuda_adb_autopoll(int devs)
453 {
454 struct adb_request req;
455
456 if ((via == NULL) || !cuda_fully_inited)
457 return -ENXIO;
458
459 cuda_request(&req, NULL, 3, CUDA_PACKET, CUDA_AUTOPOLL, (devs? 1: 0));
460 while (!req.complete)
461 cuda_poll();
462 return 0;
463 }
464
465 /* Reset adb bus - how do we do this?? */
466 static int
cuda_reset_adb_bus(void)467 cuda_reset_adb_bus(void)
468 {
469 struct adb_request req;
470
471 if ((via == NULL) || !cuda_fully_inited)
472 return -ENXIO;
473
474 cuda_request(&req, NULL, 2, ADB_PACKET, 0); /* maybe? */
475 while (!req.complete)
476 cuda_poll();
477 return 0;
478 }
479 #endif /* CONFIG_ADB */
480
481 /* Construct and send a cuda request */
482 int
cuda_request(struct adb_request * req,void (* done)(struct adb_request *),int nbytes,...)483 cuda_request(struct adb_request *req, void (*done)(struct adb_request *),
484 int nbytes, ...)
485 {
486 va_list list;
487 int i;
488
489 if (via == NULL) {
490 req->complete = 1;
491 return -ENXIO;
492 }
493
494 req->nbytes = nbytes;
495 req->done = done;
496 va_start(list, nbytes);
497 for (i = 0; i < nbytes; ++i)
498 req->data[i] = va_arg(list, int);
499 va_end(list);
500 req->reply_expected = 1;
501 return cuda_write(req);
502 }
503 EXPORT_SYMBOL(cuda_request);
504
505 static int
cuda_write(struct adb_request * req)506 cuda_write(struct adb_request *req)
507 {
508 unsigned long flags;
509
510 if (req->nbytes < 2 || req->data[0] > CUDA_PACKET) {
511 req->complete = 1;
512 return -EINVAL;
513 }
514 req->next = NULL;
515 req->sent = 0;
516 req->complete = 0;
517 req->reply_len = 0;
518
519 spin_lock_irqsave(&cuda_lock, flags);
520 if (current_req != 0) {
521 last_req->next = req;
522 last_req = req;
523 } else {
524 current_req = req;
525 last_req = req;
526 if (cuda_state == idle)
527 cuda_start();
528 }
529 spin_unlock_irqrestore(&cuda_lock, flags);
530
531 return 0;
532 }
533
534 static void
cuda_start(void)535 cuda_start(void)
536 {
537 /* assert cuda_state == idle */
538 if (current_req == NULL)
539 return;
540 data_index = 0;
541 if (TREQ_asserted(in_8(&via[B])))
542 return; /* a byte is coming in from the CUDA */
543
544 /* set the shift register to shift out and send a byte */
545 out_8(&via[ACR], in_8(&via[ACR]) | SR_OUT);
546 out_8(&via[SR], current_req->data[data_index++]);
547 if (mcu_is_egret)
548 assert_TIP_and_TACK();
549 else
550 assert_TIP();
551 cuda_state = sent_first_byte;
552 }
553
554 void
cuda_poll(void)555 cuda_poll(void)
556 {
557 cuda_interrupt(0, NULL);
558 }
559 EXPORT_SYMBOL(cuda_poll);
560
561 #define ARRAY_FULL(a, p) ((p) - (a) == ARRAY_SIZE(a))
562
563 static irqreturn_t
cuda_interrupt(int irq,void * arg)564 cuda_interrupt(int irq, void *arg)
565 {
566 unsigned long flags;
567 u8 status;
568 struct adb_request *req = NULL;
569 unsigned char ibuf[16];
570 int ibuf_len = 0;
571 int complete = 0;
572 bool full;
573
574 spin_lock_irqsave(&cuda_lock, flags);
575
576 /* On powermacs, this handler is registered for the VIA IRQ. But they use
577 * just the shift register IRQ -- other VIA interrupt sources are disabled.
578 * On m68k macs, the VIA IRQ sources are dispatched individually. Unless
579 * we are polling, the shift register IRQ flag has already been cleared.
580 */
581
582 #ifdef CONFIG_MAC
583 if (!arg)
584 #endif
585 {
586 if ((in_8(&via[IFR]) & SR_INT) == 0) {
587 spin_unlock_irqrestore(&cuda_lock, flags);
588 return IRQ_NONE;
589 } else {
590 out_8(&via[IFR], SR_INT);
591 }
592 }
593
594 status = in_8(&via[B]) & (TIP | TACK | TREQ);
595
596 switch (cuda_state) {
597 case idle:
598 /* System controller has unsolicited data for us */
599 (void)in_8(&via[SR]);
600 idle_state:
601 assert_TIP();
602 cuda_state = reading;
603 reply_ptr = cuda_rbuf;
604 reading_reply = 0;
605 break;
606
607 case awaiting_reply:
608 /* System controller has reply data for us */
609 (void)in_8(&via[SR]);
610 assert_TIP();
611 cuda_state = reading;
612 reply_ptr = current_req->reply;
613 reading_reply = 1;
614 break;
615
616 case sent_first_byte:
617 if (TREQ_asserted(status)) {
618 /* collision */
619 out_8(&via[ACR], in_8(&via[ACR]) & ~SR_OUT);
620 (void)in_8(&via[SR]);
621 negate_TIP_and_TACK();
622 cuda_state = idle;
623 /* Egret does not raise an "aborted" interrupt */
624 if (mcu_is_egret)
625 goto idle_state;
626 } else {
627 out_8(&via[SR], current_req->data[data_index++]);
628 toggle_TACK();
629 if (mcu_is_egret)
630 assert_TACK();
631 cuda_state = sending;
632 }
633 break;
634
635 case sending:
636 req = current_req;
637 if (data_index >= req->nbytes) {
638 out_8(&via[ACR], in_8(&via[ACR]) & ~SR_OUT);
639 (void)in_8(&via[SR]);
640 negate_TIP_and_TACK();
641 req->sent = 1;
642 if (req->reply_expected) {
643 cuda_state = awaiting_reply;
644 } else {
645 current_req = req->next;
646 complete = 1;
647 /* not sure about this */
648 cuda_state = idle;
649 cuda_start();
650 }
651 } else {
652 out_8(&via[SR], req->data[data_index++]);
653 toggle_TACK();
654 if (mcu_is_egret)
655 assert_TACK();
656 }
657 break;
658
659 case reading:
660 full = reading_reply ? ARRAY_FULL(current_req->reply, reply_ptr)
661 : ARRAY_FULL(cuda_rbuf, reply_ptr);
662 if (full)
663 (void)in_8(&via[SR]);
664 else
665 *reply_ptr++ = in_8(&via[SR]);
666 if (!TREQ_asserted(status) || full) {
667 if (mcu_is_egret)
668 assert_TACK();
669 /* that's all folks */
670 negate_TIP_and_TACK();
671 cuda_state = read_done;
672 /* Egret does not raise a "read done" interrupt */
673 if (mcu_is_egret)
674 goto read_done_state;
675 } else {
676 toggle_TACK();
677 if (mcu_is_egret)
678 negate_TACK();
679 }
680 break;
681
682 case read_done:
683 (void)in_8(&via[SR]);
684 read_done_state:
685 if (reading_reply) {
686 req = current_req;
687 req->reply_len = reply_ptr - req->reply;
688 if (req->data[0] == ADB_PACKET) {
689 /* Have to adjust the reply from ADB commands */
690 if (req->reply_len <= 2 || (req->reply[1] & 2) != 0) {
691 /* the 0x2 bit indicates no response */
692 req->reply_len = 0;
693 } else {
694 /* leave just the command and result bytes in the reply */
695 req->reply_len -= 2;
696 memmove(req->reply, req->reply + 2, req->reply_len);
697 }
698 }
699 current_req = req->next;
700 complete = 1;
701 reading_reply = 0;
702 } else {
703 /* This is tricky. We must break the spinlock to call
704 * cuda_input. However, doing so means we might get
705 * re-entered from another CPU getting an interrupt
706 * or calling cuda_poll(). I ended up using the stack
707 * (it's only for 16 bytes) and moving the actual
708 * call to cuda_input to outside of the lock.
709 */
710 ibuf_len = reply_ptr - cuda_rbuf;
711 memcpy(ibuf, cuda_rbuf, ibuf_len);
712 }
713 reply_ptr = cuda_rbuf;
714 cuda_state = idle;
715 cuda_start();
716 if (cuda_state == idle && TREQ_asserted(in_8(&via[B]))) {
717 assert_TIP();
718 cuda_state = reading;
719 }
720 break;
721
722 default:
723 pr_err("cuda_interrupt: unknown cuda_state %d?\n", cuda_state);
724 }
725 spin_unlock_irqrestore(&cuda_lock, flags);
726 if (complete && req) {
727 void (*done)(struct adb_request *) = req->done;
728 mb();
729 req->complete = 1;
730 /* Here, we assume that if the request has a done member, the
731 * struct request will survive to setting req->complete to 1
732 */
733 if (done)
734 (*done)(req);
735 }
736 if (ibuf_len)
737 cuda_input(ibuf, ibuf_len);
738 return IRQ_HANDLED;
739 }
740
741 static void
cuda_input(unsigned char * buf,int nb)742 cuda_input(unsigned char *buf, int nb)
743 {
744 switch (buf[0]) {
745 case ADB_PACKET:
746 #ifdef CONFIG_XMON
747 if (nb == 5 && buf[2] == 0x2c) {
748 extern int xmon_wants_key, xmon_adb_keycode;
749 if (xmon_wants_key) {
750 xmon_adb_keycode = buf[3];
751 return;
752 }
753 }
754 #endif /* CONFIG_XMON */
755 #ifdef CONFIG_ADB
756 adb_input(buf+2, nb-2, buf[1] & 0x40);
757 #endif /* CONFIG_ADB */
758 break;
759
760 case TIMER_PACKET:
761 /* Egret sends these periodically. Might be useful as a 'heartbeat'
762 * to trigger a recovery for the VIA shift register errata.
763 */
764 break;
765
766 default:
767 print_hex_dump(KERN_INFO, "cuda_input: ", DUMP_PREFIX_NONE, 32, 1,
768 buf, nb, false);
769 }
770 }
771
772 /* Offset between Unix time (1970-based) and Mac time (1904-based) */
773 #define RTC_OFFSET 2082844800
774
cuda_get_time(void)775 time64_t cuda_get_time(void)
776 {
777 struct adb_request req;
778 u32 now;
779
780 if (cuda_request(&req, NULL, 2, CUDA_PACKET, CUDA_GET_TIME) < 0)
781 return 0;
782 while (!req.complete)
783 cuda_poll();
784 if (req.reply_len != 7)
785 pr_err("%s: got %d byte reply\n", __func__, req.reply_len);
786 now = (req.reply[3] << 24) + (req.reply[4] << 16) +
787 (req.reply[5] << 8) + req.reply[6];
788 return (time64_t)now - RTC_OFFSET;
789 }
790
cuda_set_rtc_time(struct rtc_time * tm)791 int cuda_set_rtc_time(struct rtc_time *tm)
792 {
793 u32 now;
794 struct adb_request req;
795
796 now = lower_32_bits(rtc_tm_to_time64(tm) + RTC_OFFSET);
797 if (cuda_request(&req, NULL, 6, CUDA_PACKET, CUDA_SET_TIME,
798 now >> 24, now >> 16, now >> 8, now) < 0)
799 return -ENXIO;
800 while (!req.complete)
801 cuda_poll();
802 if ((req.reply_len != 3) && (req.reply_len != 7))
803 pr_err("%s: got %d byte reply\n", __func__, req.reply_len);
804 return 0;
805 }
806