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11#include <stdarg.h>
12#include <linux/types.h>
13#include <linux/errno.h>
14#include <linux/kernel.h>
15#include <linux/delay.h>
16#include <linux/adb.h>
17#include <linux/cuda.h>
18#include <linux/spinlock.h>
19#include <linux/interrupt.h>
20#ifdef CONFIG_PPC
21#include <asm/prom.h>
22#include <asm/machdep.h>
23#else
24#include <asm/macintosh.h>
25#include <asm/macints.h>
26#include <asm/mac_via.h>
27#endif
28#include <asm/io.h>
29#include <asm/system.h>
30#include <linux/init.h>
31
32static volatile unsigned char __iomem *via;
33static DEFINE_SPINLOCK(cuda_lock);
34
35
36#define RS 0x200
37#define B 0
38#define A RS
39#define DIRB (2*RS)
40#define DIRA (3*RS)
41#define T1CL (4*RS)
42#define T1CH (5*RS)
43#define T1LL (6*RS)
44#define T1LH (7*RS)
45#define T2CL (8*RS)
46#define T2CH (9*RS)
47#define SR (10*RS)
48#define ACR (11*RS)
49#define PCR (12*RS)
50#define IFR (13*RS)
51#define IER (14*RS)
52#define ANH (15*RS)
53
54
55#define TREQ 0x08
56#define TACK 0x10
57#define TIP 0x20
58
59
60#define SR_CTRL 0x1c
61#define SR_EXT 0x0c
62#define SR_OUT 0x10
63
64
65#define IER_SET 0x80
66#define IER_CLR 0
67#define SR_INT 0x04
68
69static enum cuda_state {
70 idle,
71 sent_first_byte,
72 sending,
73 reading,
74 read_done,
75 awaiting_reply
76} cuda_state;
77
78static struct adb_request *current_req;
79static struct adb_request *last_req;
80static unsigned char cuda_rbuf[16];
81static unsigned char *reply_ptr;
82static int reading_reply;
83static int data_index;
84static int cuda_irq;
85#ifdef CONFIG_PPC
86static struct device_node *vias;
87#endif
88static int cuda_fully_inited;
89
90#ifdef CONFIG_ADB
91static int cuda_probe(void);
92static int cuda_send_request(struct adb_request *req, int sync);
93static int cuda_adb_autopoll(int devs);
94static int cuda_reset_adb_bus(void);
95#endif
96
97static int cuda_init_via(void);
98static void cuda_start(void);
99static irqreturn_t cuda_interrupt(int irq, void *arg);
100static void cuda_input(unsigned char *buf, int nb);
101void cuda_poll(void);
102static int cuda_write(struct adb_request *req);
103
104int cuda_request(struct adb_request *req,
105 void (*done)(struct adb_request *), int nbytes, ...);
106
107#ifdef CONFIG_ADB
108struct adb_driver via_cuda_driver = {
109 .name = "CUDA",
110 .probe = cuda_probe,
111 .send_request = cuda_send_request,
112 .autopoll = cuda_adb_autopoll,
113 .poll = cuda_poll,
114 .reset_bus = cuda_reset_adb_bus,
115};
116#endif
117
118#ifdef CONFIG_MAC
119int __init find_via_cuda(void)
120{
121 struct adb_request req;
122 int err;
123
124 if (macintosh_config->adb_type != MAC_ADB_CUDA)
125 return 0;
126
127 via = via1;
128 cuda_state = idle;
129
130 err = cuda_init_via();
131 if (err) {
132 printk(KERN_ERR "cuda_init_via() failed\n");
133 via = NULL;
134 return 0;
135 }
136
137
138 cuda_request(&req, NULL, 3, CUDA_PACKET, CUDA_AUTOPOLL, 1);
139 while (!req.complete)
140 cuda_poll();
141
142 return 1;
143}
144#else
145int __init find_via_cuda(void)
146{
147 struct adb_request req;
148 phys_addr_t taddr;
149 const u32 *reg;
150 int err;
151
152 if (vias != 0)
153 return 1;
154 vias = of_find_node_by_name(NULL, "via-cuda");
155 if (vias == 0)
156 return 0;
157
158 reg = of_get_property(vias, "reg", NULL);
159 if (reg == NULL) {
160 printk(KERN_ERR "via-cuda: No \"reg\" property !\n");
161 goto fail;
162 }
163 taddr = of_translate_address(vias, reg);
164 if (taddr == 0) {
165 printk(KERN_ERR "via-cuda: Can't translate address !\n");
166 goto fail;
167 }
168 via = ioremap(taddr, 0x2000);
169 if (via == NULL) {
170 printk(KERN_ERR "via-cuda: Can't map address !\n");
171 goto fail;
172 }
173
174 cuda_state = idle;
175 sys_ctrler = SYS_CTRLER_CUDA;
176
177 err = cuda_init_via();
178 if (err) {
179 printk(KERN_ERR "cuda_init_via() failed\n");
180 via = NULL;
181 return 0;
182 }
183
184
185
186
187 out_8(&via[IFR], 0x7f);
188 out_8(&via[IER], IER_SET|SR_INT);
189
190
191 cuda_request(&req, NULL, 3, CUDA_PACKET, CUDA_AUTOPOLL, 1);
192 while (!req.complete)
193 cuda_poll();
194
195 return 1;
196
197 fail:
198 of_node_put(vias);
199 vias = NULL;
200 return 0;
201}
202#endif
203
204static int __init via_cuda_start(void)
205{
206 if (via == NULL)
207 return -ENODEV;
208
209#ifdef CONFIG_MAC
210 cuda_irq = IRQ_MAC_ADB;
211#else
212 cuda_irq = irq_of_parse_and_map(vias, 0);
213 if (cuda_irq == NO_IRQ) {
214 printk(KERN_ERR "via-cuda: can't map interrupts for %s\n",
215 vias->full_name);
216 return -ENODEV;
217 }
218#endif
219
220 if (request_irq(cuda_irq, cuda_interrupt, 0, "ADB", cuda_interrupt)) {
221 printk(KERN_ERR "via-cuda: can't request irq %d\n", cuda_irq);
222 return -EAGAIN;
223 }
224
225 printk("Macintosh CUDA driver v0.5 for Unified ADB.\n");
226
227 cuda_fully_inited = 1;
228 return 0;
229}
230
231device_initcall(via_cuda_start);
232
233#ifdef CONFIG_ADB
234static int
235cuda_probe(void)
236{
237#ifdef CONFIG_PPC
238 if (sys_ctrler != SYS_CTRLER_CUDA)
239 return -ENODEV;
240#else
241 if (macintosh_config->adb_type != MAC_ADB_CUDA)
242 return -ENODEV;
243#endif
244 if (via == NULL)
245 return -ENODEV;
246 return 0;
247}
248#endif
249
250#define WAIT_FOR(cond, what) \
251 do { \
252 int x; \
253 for (x = 1000; !(cond); --x) { \
254 if (x == 0) { \
255 printk("Timeout waiting for " what "\n"); \
256 return -ENXIO; \
257 } \
258 udelay(100); \
259 } \
260 } while (0)
261
262static int
263cuda_init_via(void)
264{
265 out_8(&via[DIRB], (in_8(&via[DIRB]) | TACK | TIP) & ~TREQ);
266 out_8(&via[B], in_8(&via[B]) | TACK | TIP);
267 out_8(&via[ACR] ,(in_8(&via[ACR]) & ~SR_CTRL) | SR_EXT);
268 (void)in_8(&via[SR]);
269#ifdef CONFIG_PPC
270 out_8(&via[IER], 0x7f);
271 (void)in_8(&via[IER]);
272#else
273 out_8(&via[IER], SR_INT);
274#endif
275
276
277 mdelay(4);
278 (void)in_8(&via[SR]);
279 out_8(&via[IFR], SR_INT);
280
281
282 out_8(&via[B], in_8(&via[B]) & ~TACK);
283
284
285 WAIT_FOR((in_8(&via[B]) & TREQ) == 0, "CUDA response to sync");
286
287
288 WAIT_FOR(in_8(&via[IFR]) & SR_INT, "CUDA response to sync (2)");
289 (void)in_8(&via[SR]);
290 out_8(&via[IFR], SR_INT);
291
292
293 out_8(&via[B], in_8(&via[B]) | TACK);
294
295
296 WAIT_FOR(in_8(&via[B]) & TREQ, "CUDA response to sync (3)");
297 WAIT_FOR(in_8(&via[IFR]) & SR_INT, "CUDA response to sync (4)");
298 (void)in_8(&via[SR]);
299 out_8(&via[IFR], SR_INT);
300 out_8(&via[B], in_8(&via[B]) | TIP);
301
302 return 0;
303}
304
305#ifdef CONFIG_ADB
306
307static int
308cuda_send_request(struct adb_request *req, int sync)
309{
310 int i;
311
312 if ((via == NULL) || !cuda_fully_inited) {
313 req->complete = 1;
314 return -ENXIO;
315 }
316
317 req->reply_expected = 1;
318
319 i = cuda_write(req);
320 if (i)
321 return i;
322
323 if (sync) {
324 while (!req->complete)
325 cuda_poll();
326 }
327 return 0;
328}
329
330
331
332static int
333cuda_adb_autopoll(int devs)
334{
335 struct adb_request req;
336
337 if ((via == NULL) || !cuda_fully_inited)
338 return -ENXIO;
339
340 cuda_request(&req, NULL, 3, CUDA_PACKET, CUDA_AUTOPOLL, (devs? 1: 0));
341 while (!req.complete)
342 cuda_poll();
343 return 0;
344}
345
346
347static int
348cuda_reset_adb_bus(void)
349{
350 struct adb_request req;
351
352 if ((via == NULL) || !cuda_fully_inited)
353 return -ENXIO;
354
355 cuda_request(&req, NULL, 2, ADB_PACKET, 0);
356 while (!req.complete)
357 cuda_poll();
358 return 0;
359}
360#endif
361
362int
363cuda_request(struct adb_request *req, void (*done)(struct adb_request *),
364 int nbytes, ...)
365{
366 va_list list;
367 int i;
368
369 if (via == NULL) {
370 req->complete = 1;
371 return -ENXIO;
372 }
373
374 req->nbytes = nbytes;
375 req->done = done;
376 va_start(list, nbytes);
377 for (i = 0; i < nbytes; ++i)
378 req->data[i] = va_arg(list, int);
379 va_end(list);
380 req->reply_expected = 1;
381 return cuda_write(req);
382}
383
384static int
385cuda_write(struct adb_request *req)
386{
387 unsigned long flags;
388
389 if (req->nbytes < 2 || req->data[0] > CUDA_PACKET) {
390 req->complete = 1;
391 return -EINVAL;
392 }
393 req->next = NULL;
394 req->sent = 0;
395 req->complete = 0;
396 req->reply_len = 0;
397
398 spin_lock_irqsave(&cuda_lock, flags);
399 if (current_req != 0) {
400 last_req->next = req;
401 last_req = req;
402 } else {
403 current_req = req;
404 last_req = req;
405 if (cuda_state == idle)
406 cuda_start();
407 }
408 spin_unlock_irqrestore(&cuda_lock, flags);
409
410 return 0;
411}
412
413static void
414cuda_start(void)
415{
416 struct adb_request *req;
417
418
419
420 req = current_req;
421 if (req == 0)
422 return;
423 if ((in_8(&via[B]) & TREQ) == 0)
424 return;
425
426
427 out_8(&via[ACR], in_8(&via[ACR]) | SR_OUT);
428 out_8(&via[SR], req->data[0]);
429 out_8(&via[B], in_8(&via[B]) & ~TIP);
430 cuda_state = sent_first_byte;
431}
432
433void
434cuda_poll(void)
435{
436
437
438
439 if (cuda_irq)
440 disable_irq(cuda_irq);
441 cuda_interrupt(0, NULL);
442 if (cuda_irq)
443 enable_irq(cuda_irq);
444}
445
446static irqreturn_t
447cuda_interrupt(int irq, void *arg)
448{
449 int status;
450 struct adb_request *req = NULL;
451 unsigned char ibuf[16];
452 int ibuf_len = 0;
453 int complete = 0;
454
455 spin_lock(&cuda_lock);
456
457
458
459
460
461
462
463#ifdef CONFIG_MAC
464 if (!arg)
465#endif
466 {
467 if ((in_8(&via[IFR]) & SR_INT) == 0) {
468 spin_unlock(&cuda_lock);
469 return IRQ_NONE;
470 } else {
471 out_8(&via[IFR], SR_INT);
472 }
473 }
474
475 status = (~in_8(&via[B]) & (TIP|TREQ)) | (in_8(&via[ACR]) & SR_OUT);
476
477 switch (cuda_state) {
478 case idle:
479
480 if (status != TREQ)
481 printk("cuda: state=idle, status=%x\n", status);
482 (void)in_8(&via[SR]);
483 out_8(&via[B], in_8(&via[B]) & ~TIP);
484 cuda_state = reading;
485 reply_ptr = cuda_rbuf;
486 reading_reply = 0;
487 break;
488
489 case awaiting_reply:
490
491 if (status != TREQ)
492 printk("cuda: state=awaiting_reply, status=%x\n", status);
493 (void)in_8(&via[SR]);
494 out_8(&via[B], in_8(&via[B]) & ~TIP);
495 cuda_state = reading;
496 reply_ptr = current_req->reply;
497 reading_reply = 1;
498 break;
499
500 case sent_first_byte:
501 if (status == TREQ + TIP + SR_OUT) {
502
503 out_8(&via[ACR], in_8(&via[ACR]) & ~SR_OUT);
504 (void)in_8(&via[SR]);
505 out_8(&via[B], in_8(&via[B]) | TIP | TACK);
506 cuda_state = idle;
507 } else {
508
509 if (status != TIP + SR_OUT)
510 printk("cuda: state=sent_first_byte status=%x\n", status);
511 out_8(&via[SR], current_req->data[1]);
512 out_8(&via[B], in_8(&via[B]) ^ TACK);
513 data_index = 2;
514 cuda_state = sending;
515 }
516 break;
517
518 case sending:
519 req = current_req;
520 if (data_index >= req->nbytes) {
521 out_8(&via[ACR], in_8(&via[ACR]) & ~SR_OUT);
522 (void)in_8(&via[SR]);
523 out_8(&via[B], in_8(&via[B]) | TACK | TIP);
524 req->sent = 1;
525 if (req->reply_expected) {
526 cuda_state = awaiting_reply;
527 } else {
528 current_req = req->next;
529 complete = 1;
530
531 cuda_state = idle;
532 cuda_start();
533 }
534 } else {
535 out_8(&via[SR], req->data[data_index++]);
536 out_8(&via[B], in_8(&via[B]) ^ TACK);
537 }
538 break;
539
540 case reading:
541 *reply_ptr++ = in_8(&via[SR]);
542 if (status == TIP) {
543
544 out_8(&via[B], in_8(&via[B]) | TACK | TIP);
545 cuda_state = read_done;
546 } else {
547
548 if (status != TIP + TREQ)
549 printk("cuda: state=reading status=%x\n", status);
550 out_8(&via[B], in_8(&via[B]) ^ TACK);
551 }
552 break;
553
554 case read_done:
555 (void)in_8(&via[SR]);
556 if (reading_reply) {
557 req = current_req;
558 req->reply_len = reply_ptr - req->reply;
559 if (req->data[0] == ADB_PACKET) {
560
561 if (req->reply_len <= 2 || (req->reply[1] & 2) != 0) {
562
563 req->reply_len = 0;
564 } else {
565
566 req->reply_len -= 2;
567 memmove(req->reply, req->reply + 2, req->reply_len);
568 }
569 }
570 current_req = req->next;
571 complete = 1;
572 } else {
573
574
575
576
577
578
579
580 ibuf_len = reply_ptr - cuda_rbuf;
581 memcpy(ibuf, cuda_rbuf, ibuf_len);
582 }
583 if (status == TREQ) {
584 out_8(&via[B], in_8(&via[B]) & ~TIP);
585 cuda_state = reading;
586 reply_ptr = cuda_rbuf;
587 reading_reply = 0;
588 } else {
589 cuda_state = idle;
590 cuda_start();
591 }
592 break;
593
594 default:
595 printk("cuda_interrupt: unknown cuda_state %d?\n", cuda_state);
596 }
597 spin_unlock(&cuda_lock);
598 if (complete && req) {
599 void (*done)(struct adb_request *) = req->done;
600 mb();
601 req->complete = 1;
602
603
604
605 if (done)
606 (*done)(req);
607 }
608 if (ibuf_len)
609 cuda_input(ibuf, ibuf_len);
610 return IRQ_HANDLED;
611}
612
613static void
614cuda_input(unsigned char *buf, int nb)
615{
616 int i;
617
618 switch (buf[0]) {
619 case ADB_PACKET:
620#ifdef CONFIG_XMON
621 if (nb == 5 && buf[2] == 0x2c) {
622 extern int xmon_wants_key, xmon_adb_keycode;
623 if (xmon_wants_key) {
624 xmon_adb_keycode = buf[3];
625 return;
626 }
627 }
628#endif
629#ifdef CONFIG_ADB
630 adb_input(buf+2, nb-2, buf[1] & 0x40);
631#endif
632 break;
633
634 default:
635 printk("data from cuda (%d bytes):", nb);
636 for (i = 0; i < nb; ++i)
637 printk(" %.2x", buf[i]);
638 printk("\n");
639 }
640}
641