1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27#include <stdarg.h>
28#include <linux/types.h>
29#include <linux/errno.h>
30#include <linux/kernel.h>
31#include <linux/delay.h>
32#include <linux/adb.h>
33#include <linux/interrupt.h>
34#include <linux/init.h>
35#include <asm/macintosh.h>
36#include <asm/macints.h>
37#include <asm/mac_via.h>
38
39static volatile unsigned char *via;
40
41
42#define RS 0x200
43#define B 0
44#define A RS
45#define DIRB (2*RS)
46#define DIRA (3*RS)
47#define T1CL (4*RS)
48#define T1CH (5*RS)
49#define T1LL (6*RS)
50#define T1LH (7*RS)
51#define T2CL (8*RS)
52#define T2CH (9*RS)
53#define SR (10*RS)
54#define ACR (11*RS)
55#define PCR (12*RS)
56#define IFR (13*RS)
57#define IER (14*RS)
58#define ANH (15*RS)
59
60
61#define CTLR_IRQ 0x08
62#define ST_MASK 0x30
63
64
65#define SR_CTRL 0x1c
66#define SR_EXT 0x0c
67#define SR_OUT 0x10
68
69
70#define IER_SET 0x80
71#define IER_CLR 0
72#define SR_INT 0x04
73
74
75#define ST_CMD 0x00
76#define ST_EVEN 0x10
77#define ST_ODD 0x20
78#define ST_IDLE 0x30
79
80
81#define ADDR_MASK 0xF0
82#define CMD_MASK 0x0F
83#define OP_MASK 0x0C
84#define TALK 0x0C
85
86static int macii_init_via(void);
87static void macii_start(void);
88static irqreturn_t macii_interrupt(int irq, void *arg);
89static void macii_queue_poll(void);
90
91static int macii_probe(void);
92static int macii_init(void);
93static int macii_send_request(struct adb_request *req, int sync);
94static int macii_write(struct adb_request *req);
95static int macii_autopoll(int devs);
96static void macii_poll(void);
97static int macii_reset_bus(void);
98
99struct adb_driver via_macii_driver = {
100 .name = "Mac II",
101 .probe = macii_probe,
102 .init = macii_init,
103 .send_request = macii_send_request,
104 .autopoll = macii_autopoll,
105 .poll = macii_poll,
106 .reset_bus = macii_reset_bus,
107};
108
109static enum macii_state {
110 idle,
111 sending,
112 reading,
113} macii_state;
114
115static struct adb_request *current_req;
116static struct adb_request *last_req;
117static unsigned char reply_buf[16];
118static unsigned char *reply_ptr;
119static bool reading_reply;
120static int data_index;
121static int reply_len;
122static int status;
123static bool bus_timeout;
124static bool srq_asserted;
125static u8 last_cmd;
126static u8 last_talk_cmd;
127static u8 last_poll_cmd;
128static unsigned int autopoll_devs;
129
130
131static int macii_probe(void)
132{
133 if (macintosh_config->adb_type != MAC_ADB_II)
134 return -ENODEV;
135
136 via = via1;
137
138 pr_info("adb: Mac II ADB Driver v1.0 for Unified ADB\n");
139 return 0;
140}
141
142
143static int macii_init(void)
144{
145 unsigned long flags;
146 int err;
147
148 local_irq_save(flags);
149
150 err = macii_init_via();
151 if (err)
152 goto out;
153
154 err = request_irq(IRQ_MAC_ADB, macii_interrupt, 0, "ADB",
155 macii_interrupt);
156 if (err)
157 goto out;
158
159 macii_state = idle;
160out:
161 local_irq_restore(flags);
162 return err;
163}
164
165
166static int macii_init_via(void)
167{
168 unsigned char x;
169
170
171 via[DIRB] = (via[DIRB] | ST_EVEN | ST_ODD) & ~CTLR_IRQ;
172
173
174 via[B] |= ST_IDLE;
175
176
177 via[ACR] = (via[ACR] & ~SR_CTRL) | SR_EXT;
178
179
180 x = via[SR];
181
182 return 0;
183}
184
185
186static void macii_queue_poll(void)
187{
188 static struct adb_request req;
189 unsigned char poll_command;
190 unsigned int poll_addr;
191
192
193
194
195
196
197 if (!autopoll_devs)
198 return;
199
200
201
202
203
204
205 poll_addr = (last_poll_cmd & ADDR_MASK) >> 4;
206 if ((srq_asserted && last_cmd == last_poll_cmd) ||
207 !(autopoll_devs & (1 << poll_addr))) {
208 unsigned int higher_devs;
209
210 higher_devs = autopoll_devs & -(1 << (poll_addr + 1));
211 poll_addr = ffs(higher_devs ? higher_devs : autopoll_devs) - 1;
212 }
213
214
215 poll_command = ADB_READREG(poll_addr, 0);
216
217
218
219
220 if (poll_command == last_cmd)
221 return;
222
223 adb_request(&req, NULL, ADBREQ_NOSEND, 1, poll_command);
224
225 req.sent = 0;
226 req.complete = 0;
227 req.reply_len = 0;
228 req.next = current_req;
229
230 if (WARN_ON(current_req)) {
231 current_req = &req;
232 } else {
233 current_req = &req;
234 last_req = &req;
235 }
236}
237
238
239static int macii_send_request(struct adb_request *req, int sync)
240{
241 int err;
242
243 err = macii_write(req);
244 if (err)
245 return err;
246
247 if (sync)
248 while (!req->complete)
249 macii_poll();
250
251 return 0;
252}
253
254
255static int macii_write(struct adb_request *req)
256{
257 unsigned long flags;
258
259 if (req->nbytes < 2 || req->data[0] != ADB_PACKET || req->nbytes > 15) {
260 req->complete = 1;
261 return -EINVAL;
262 }
263
264 req->next = NULL;
265 req->sent = 0;
266 req->complete = 0;
267 req->reply_len = 0;
268
269 local_irq_save(flags);
270
271 if (current_req != NULL) {
272 last_req->next = req;
273 last_req = req;
274 } else {
275 current_req = req;
276 last_req = req;
277 if (macii_state == idle)
278 macii_start();
279 }
280
281 local_irq_restore(flags);
282
283 return 0;
284}
285
286
287static int macii_autopoll(int devs)
288{
289 unsigned long flags;
290
291 local_irq_save(flags);
292
293
294 autopoll_devs = (unsigned int)devs & 0xFFFE;
295
296 if (!current_req) {
297 macii_queue_poll();
298 if (current_req && macii_state == idle)
299 macii_start();
300 }
301
302 local_irq_restore(flags);
303
304 return 0;
305}
306
307
308static void macii_poll(void)
309{
310 macii_interrupt(0, NULL);
311}
312
313
314static int macii_reset_bus(void)
315{
316 struct adb_request req;
317
318
319 adb_request(&req, NULL, ADBREQ_NOSEND, 1, ADB_BUSRESET);
320 macii_send_request(&req, 1);
321
322
323 udelay(3000);
324
325 return 0;
326}
327
328
329static void macii_start(void)
330{
331 struct adb_request *req;
332
333 req = current_req;
334
335
336
337
338
339
340
341 via[ACR] |= SR_OUT;
342
343 via[SR] = req->data[1];
344
345 via[B] = (via[B] & ~ST_MASK) | ST_CMD;
346
347 macii_state = sending;
348 data_index = 2;
349
350 bus_timeout = false;
351 srq_asserted = false;
352}
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372static irqreturn_t macii_interrupt(int irq, void *arg)
373{
374 int x;
375 struct adb_request *req;
376 unsigned long flags;
377
378 local_irq_save(flags);
379
380 if (!arg) {
381
382 if (via[IFR] & SR_INT)
383 via[IFR] = SR_INT;
384 else {
385 local_irq_restore(flags);
386 return IRQ_NONE;
387 }
388 }
389
390 status = via[B] & (ST_MASK | CTLR_IRQ);
391
392 switch (macii_state) {
393 case idle:
394 WARN_ON((status & ST_MASK) != ST_IDLE);
395
396 reply_ptr = reply_buf;
397 reading_reply = false;
398
399 bus_timeout = false;
400 srq_asserted = false;
401
402 x = via[SR];
403
404 if (!(status & CTLR_IRQ)) {
405
406
407
408 macii_state = reading;
409 *reply_ptr = x;
410 reply_len = 1;
411 } else {
412
413 reply_len = 0;
414 break;
415 }
416
417
418 via[B] = (via[B] & ~ST_MASK) | ST_EVEN;
419 break;
420
421 case sending:
422 req = current_req;
423
424 if (status == (ST_CMD | CTLR_IRQ)) {
425
426
427
428
429
430 last_cmd = req->data[1];
431 if ((last_cmd & OP_MASK) == TALK) {
432 last_talk_cmd = last_cmd;
433 if ((last_cmd & CMD_MASK) == ADB_READREG(0, 0))
434 last_poll_cmd = last_cmd;
435 }
436 }
437
438 if (status == ST_CMD) {
439
440
441
442
443 macii_state = reading;
444
445 reading_reply = false;
446 reply_ptr = reply_buf;
447 *reply_ptr = last_talk_cmd;
448 reply_len = 1;
449
450
451 via[ACR] &= ~SR_OUT;
452 x = via[SR];
453 } else if (data_index >= req->nbytes) {
454 req->sent = 1;
455
456 if (req->reply_expected) {
457 macii_state = reading;
458
459 reading_reply = true;
460 reply_ptr = req->reply;
461 *reply_ptr = req->data[1];
462 reply_len = 1;
463
464 via[ACR] &= ~SR_OUT;
465 x = via[SR];
466 } else if ((req->data[1] & OP_MASK) == TALK) {
467 macii_state = reading;
468
469 reading_reply = false;
470 reply_ptr = reply_buf;
471 *reply_ptr = req->data[1];
472 reply_len = 1;
473
474 via[ACR] &= ~SR_OUT;
475 x = via[SR];
476
477 req->complete = 1;
478 current_req = req->next;
479 if (req->done)
480 (*req->done)(req);
481 } else {
482 macii_state = idle;
483
484 req->complete = 1;
485 current_req = req->next;
486 if (req->done)
487 (*req->done)(req);
488 break;
489 }
490 } else {
491 via[SR] = req->data[data_index++];
492 }
493
494 if ((via[B] & ST_MASK) == ST_CMD) {
495
496 via[B] = (via[B] & ~ST_MASK) | ST_EVEN;
497 } else {
498
499 via[B] ^= ST_MASK;
500 }
501 break;
502
503 case reading:
504 x = via[SR];
505 WARN_ON((status & ST_MASK) == ST_CMD ||
506 (status & ST_MASK) == ST_IDLE);
507
508 if (!(status & CTLR_IRQ)) {
509 if (status == ST_EVEN && reply_len == 1) {
510 bus_timeout = true;
511 } else if (status == ST_ODD && reply_len == 2) {
512 srq_asserted = true;
513 } else {
514 macii_state = idle;
515
516 if (bus_timeout)
517 reply_len = 0;
518
519 if (reading_reply) {
520 struct adb_request *req = current_req;
521
522 req->reply_len = reply_len;
523
524 req->complete = 1;
525 current_req = req->next;
526 if (req->done)
527 (*req->done)(req);
528 } else if (reply_len && autopoll_devs &&
529 reply_buf[0] == last_poll_cmd) {
530 adb_input(reply_buf, reply_len, 1);
531 }
532 break;
533 }
534 }
535
536 if (reply_len < ARRAY_SIZE(reply_buf)) {
537 reply_ptr++;
538 *reply_ptr = x;
539 reply_len++;
540 }
541
542
543 via[B] ^= ST_MASK;
544 break;
545
546 default:
547 break;
548 }
549
550 if (macii_state == idle) {
551 if (!current_req)
552 macii_queue_poll();
553
554 if (current_req)
555 macii_start();
556
557 if (macii_state == idle) {
558 via[ACR] &= ~SR_OUT;
559 x = via[SR];
560 via[B] = (via[B] & ~ST_MASK) | ST_IDLE;
561 }
562 }
563
564 local_irq_restore(flags);
565 return IRQ_HANDLED;
566}
567