Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Device driver for the via ADB on (many) Mac II-class machines | |
3 | * | |
4 | * Based on the original ADB keyboard handler Copyright (c) 1997 Alan Cox | |
5 | * Also derived from code Copyright (C) 1996 Paul Mackerras. | |
6 | * | |
7 | * With various updates provided over the years by Michael Schmitz, | |
8 | * Guideo Koerber and others. | |
9 | * | |
10 | * Rewrite for Unified ADB by Joshua M. Thompson (funaho@jurai.org) | |
11 | * | |
12 | * 1999-08-02 (jmt) - Initial rewrite for Unified ADB. | |
13 | * 2000-03-29 Tony Mantler <tonym@mac.linux-m68k.org> | |
14 | * - Big overhaul, should actually work now. | |
15 | */ | |
16 | ||
17 | #include <stdarg.h> | |
18 | #include <linux/types.h> | |
19 | #include <linux/errno.h> | |
20 | #include <linux/kernel.h> | |
21 | #include <linux/delay.h> | |
1da177e4 LT |
22 | #include <linux/adb.h> |
23 | #include <linux/interrupt.h> | |
24 | #include <linux/init.h> | |
25 | #include <asm/macintosh.h> | |
26 | #include <asm/macints.h> | |
27 | #include <asm/machw.h> | |
28 | #include <asm/mac_via.h> | |
29 | #include <asm/io.h> | |
30 | #include <asm/system.h> | |
31 | ||
32 | static volatile unsigned char *via; | |
33 | ||
34 | /* VIA registers - spaced 0x200 bytes apart */ | |
35 | #define RS 0x200 /* skip between registers */ | |
36 | #define B 0 /* B-side data */ | |
37 | #define A RS /* A-side data */ | |
38 | #define DIRB (2*RS) /* B-side direction (1=output) */ | |
39 | #define DIRA (3*RS) /* A-side direction (1=output) */ | |
40 | #define T1CL (4*RS) /* Timer 1 ctr/latch (low 8 bits) */ | |
41 | #define T1CH (5*RS) /* Timer 1 counter (high 8 bits) */ | |
42 | #define T1LL (6*RS) /* Timer 1 latch (low 8 bits) */ | |
43 | #define T1LH (7*RS) /* Timer 1 latch (high 8 bits) */ | |
44 | #define T2CL (8*RS) /* Timer 2 ctr/latch (low 8 bits) */ | |
45 | #define T2CH (9*RS) /* Timer 2 counter (high 8 bits) */ | |
46 | #define SR (10*RS) /* Shift register */ | |
47 | #define ACR (11*RS) /* Auxiliary control register */ | |
48 | #define PCR (12*RS) /* Peripheral control register */ | |
49 | #define IFR (13*RS) /* Interrupt flag register */ | |
50 | #define IER (14*RS) /* Interrupt enable register */ | |
51 | #define ANH (15*RS) /* A-side data, no handshake */ | |
52 | ||
53 | /* Bits in B data register: all active low */ | |
54 | #define TREQ 0x08 /* Transfer request (input) */ | |
55 | #define TACK 0x10 /* Transfer acknowledge (output) */ | |
56 | #define TIP 0x20 /* Transfer in progress (output) */ | |
57 | #define ST_MASK 0x30 /* mask for selecting ADB state bits */ | |
58 | ||
59 | /* Bits in ACR */ | |
60 | #define SR_CTRL 0x1c /* Shift register control bits */ | |
61 | #define SR_EXT 0x0c /* Shift on external clock */ | |
62 | #define SR_OUT 0x10 /* Shift out if 1 */ | |
63 | ||
64 | /* Bits in IFR and IER */ | |
65 | #define IER_SET 0x80 /* set bits in IER */ | |
66 | #define IER_CLR 0 /* clear bits in IER */ | |
67 | #define SR_INT 0x04 /* Shift register full/empty */ | |
68 | #define SR_DATA 0x08 /* Shift register data */ | |
69 | #define SR_CLOCK 0x10 /* Shift register clock */ | |
70 | ||
71 | /* ADB transaction states according to GMHW */ | |
72 | #define ST_CMD 0x00 /* ADB state: command byte */ | |
73 | #define ST_EVEN 0x10 /* ADB state: even data byte */ | |
74 | #define ST_ODD 0x20 /* ADB state: odd data byte */ | |
75 | #define ST_IDLE 0x30 /* ADB state: idle, nothing to send */ | |
76 | ||
77 | static int macii_init_via(void); | |
78 | static void macii_start(void); | |
7d12e780 | 79 | static irqreturn_t macii_interrupt(int irq, void *arg); |
1da177e4 LT |
80 | static void macii_retransmit(int); |
81 | static void macii_queue_poll(void); | |
82 | ||
83 | static int macii_probe(void); | |
84 | static int macii_init(void); | |
85 | static int macii_send_request(struct adb_request *req, int sync); | |
86 | static int macii_write(struct adb_request *req); | |
87 | static int macii_autopoll(int devs); | |
88 | static void macii_poll(void); | |
89 | static int macii_reset_bus(void); | |
90 | ||
91 | struct adb_driver via_macii_driver = { | |
92 | "Mac II", | |
93 | macii_probe, | |
94 | macii_init, | |
95 | macii_send_request, | |
96 | macii_autopoll, | |
97 | macii_poll, | |
98 | macii_reset_bus | |
99 | }; | |
100 | ||
101 | static enum macii_state { | |
102 | idle, | |
103 | sending, | |
104 | reading, | |
105 | read_done, | |
106 | awaiting_reply | |
107 | } macii_state; | |
108 | ||
87275856 OH |
109 | static int need_poll; |
110 | static int command_byte; | |
111 | static int last_reply; | |
112 | static int last_active; | |
1da177e4 LT |
113 | |
114 | static struct adb_request *current_req; | |
115 | static struct adb_request *last_req; | |
116 | static struct adb_request *retry_req; | |
117 | static unsigned char reply_buf[16]; | |
118 | static unsigned char *reply_ptr; | |
119 | static int reply_len; | |
120 | static int reading_reply; | |
121 | static int data_index; | |
122 | static int first_byte; | |
123 | static int prefix_len; | |
124 | static int status = ST_IDLE|TREQ; | |
125 | static int last_status; | |
87275856 | 126 | static int driver_running; |
1da177e4 LT |
127 | |
128 | /* debug level 10 required for ADB logging (should be && debug_adb, ideally) */ | |
129 | ||
130 | /* Check for MacII style ADB */ | |
131 | static int macii_probe(void) | |
132 | { | |
133 | if (macintosh_config->adb_type != MAC_ADB_II) return -ENODEV; | |
134 | ||
135 | via = via1; | |
136 | ||
137 | printk("adb: Mac II ADB Driver v1.0 for Unified ADB\n"); | |
138 | return 0; | |
139 | } | |
140 | ||
141 | /* Initialize the driver */ | |
142 | int macii_init(void) | |
143 | { | |
144 | unsigned long flags; | |
145 | int err; | |
146 | ||
147 | local_irq_save(flags); | |
148 | ||
149 | err = macii_init_via(); | |
150 | if (err) return err; | |
151 | ||
152 | err = request_irq(IRQ_MAC_ADB, macii_interrupt, IRQ_FLG_LOCK, "ADB", | |
153 | macii_interrupt); | |
154 | if (err) return err; | |
155 | ||
156 | macii_state = idle; | |
157 | local_irq_restore(flags); | |
158 | return 0; | |
159 | } | |
160 | ||
161 | /* initialize the hardware */ | |
162 | static int macii_init_via(void) | |
163 | { | |
164 | unsigned char x; | |
165 | ||
166 | /* Set the lines up. We want TREQ as input TACK|TIP as output */ | |
167 | via[DIRB] = (via[DIRB] | TACK | TIP) & ~TREQ; | |
168 | ||
169 | /* Set up state: idle */ | |
170 | via[B] |= ST_IDLE; | |
171 | last_status = via[B] & (ST_MASK|TREQ); | |
172 | ||
173 | /* Shift register on input */ | |
174 | via[ACR] = (via[ACR] & ~SR_CTRL) | SR_EXT; | |
175 | ||
176 | /* Wipe any pending data and int */ | |
177 | x = via[SR]; | |
178 | ||
179 | return 0; | |
180 | } | |
181 | ||
182 | /* Send an ADB poll (Talk Register 0 command, tagged on the front of the request queue) */ | |
183 | static void macii_queue_poll(void) | |
184 | { | |
185 | static int device = 0; | |
186 | static int in_poll=0; | |
187 | static struct adb_request req; | |
188 | unsigned long flags; | |
189 | ||
190 | if (in_poll) printk("macii_queue_poll: double poll!\n"); | |
191 | ||
192 | in_poll++; | |
193 | if (++device > 15) device = 1; | |
194 | ||
195 | adb_request(&req, NULL, ADBREQ_REPLY|ADBREQ_NOSEND, 1, | |
196 | ADB_READREG(device, 0)); | |
197 | ||
198 | local_irq_save(flags); | |
199 | ||
200 | req.next = current_req; | |
201 | current_req = &req; | |
202 | ||
203 | local_irq_restore(flags); | |
204 | macii_start(); | |
205 | in_poll--; | |
206 | } | |
207 | ||
208 | /* Send an ADB retransmit (Talk, appended to the request queue) */ | |
209 | static void macii_retransmit(int device) | |
210 | { | |
211 | static int in_retransmit = 0; | |
212 | static struct adb_request rt; | |
213 | unsigned long flags; | |
214 | ||
215 | if (in_retransmit) printk("macii_retransmit: double retransmit!\n"); | |
216 | ||
217 | in_retransmit++; | |
218 | ||
219 | adb_request(&rt, NULL, ADBREQ_REPLY|ADBREQ_NOSEND, 1, | |
220 | ADB_READREG(device, 0)); | |
221 | ||
222 | local_irq_save(flags); | |
223 | ||
224 | if (current_req != NULL) { | |
225 | last_req->next = &rt; | |
226 | last_req = &rt; | |
227 | } else { | |
228 | current_req = &rt; | |
229 | last_req = &rt; | |
230 | } | |
231 | ||
232 | if (macii_state == idle) macii_start(); | |
233 | ||
234 | local_irq_restore(flags); | |
235 | in_retransmit--; | |
236 | } | |
237 | ||
238 | /* Send an ADB request; if sync, poll out the reply 'till it's done */ | |
239 | static int macii_send_request(struct adb_request *req, int sync) | |
240 | { | |
241 | int i; | |
242 | ||
243 | i = macii_write(req); | |
244 | if (i) return i; | |
245 | ||
246 | if (sync) { | |
247 | while (!req->complete) macii_poll(); | |
248 | } | |
249 | return 0; | |
250 | } | |
251 | ||
252 | /* Send an ADB request */ | |
253 | static int macii_write(struct adb_request *req) | |
254 | { | |
255 | unsigned long flags; | |
256 | ||
257 | if (req->nbytes < 2 || req->data[0] != ADB_PACKET || req->nbytes > 15) { | |
258 | req->complete = 1; | |
259 | return -EINVAL; | |
260 | } | |
261 | ||
a5d361fc | 262 | req->next = NULL; |
1da177e4 LT |
263 | req->sent = 0; |
264 | req->complete = 0; | |
265 | req->reply_len = 0; | |
266 | ||
267 | local_irq_save(flags); | |
268 | ||
269 | if (current_req != NULL) { | |
270 | last_req->next = req; | |
271 | last_req = req; | |
272 | } else { | |
273 | current_req = req; | |
274 | last_req = req; | |
275 | if (macii_state == idle) macii_start(); | |
276 | } | |
277 | ||
278 | local_irq_restore(flags); | |
279 | return 0; | |
280 | } | |
281 | ||
282 | /* Start auto-polling */ | |
283 | static int macii_autopoll(int devs) | |
284 | { | |
285 | /* Just ping a random default address */ | |
286 | if (!(current_req || retry_req)) | |
287 | macii_retransmit( (last_active < 16 && last_active > 0) ? last_active : 3); | |
288 | return 0; | |
289 | } | |
290 | ||
291 | /* Prod the chip without interrupts */ | |
292 | static void macii_poll(void) | |
293 | { | |
294 | unsigned long flags; | |
295 | ||
296 | local_irq_save(flags); | |
2850bc27 | 297 | if (via[IFR] & SR_INT) macii_interrupt(0, NULL); |
1da177e4 LT |
298 | local_irq_restore(flags); |
299 | } | |
300 | ||
301 | /* Reset the bus */ | |
302 | static int macii_reset_bus(void) | |
303 | { | |
304 | static struct adb_request req; | |
305 | ||
306 | /* Command = 0, Address = ignored */ | |
307 | adb_request(&req, NULL, 0, 1, ADB_BUSRESET); | |
308 | ||
309 | return 0; | |
310 | } | |
311 | ||
312 | /* Start sending ADB packet */ | |
313 | static void macii_start(void) | |
314 | { | |
315 | unsigned long flags; | |
316 | struct adb_request *req; | |
317 | ||
318 | req = current_req; | |
319 | if (!req) return; | |
320 | ||
321 | /* assert macii_state == idle */ | |
322 | if (macii_state != idle) { | |
323 | printk("macii_start: called while driver busy (%p %x %x)!\n", | |
324 | req, macii_state, (uint) via1[B] & (ST_MASK|TREQ)); | |
325 | return; | |
326 | } | |
327 | ||
328 | local_irq_save(flags); | |
329 | ||
330 | /* | |
331 | * IRQ signaled ?? (means ADB controller wants to send, or might | |
332 | * be end of packet if we were reading) | |
333 | */ | |
334 | #if 0 /* FIXME: This is broke broke broke, for some reason */ | |
335 | if ((via[B] & TREQ) == 0) { | |
336 | printk("macii_start: weird poll stuff. huh?\n"); | |
337 | /* | |
338 | * FIXME - we need to restart this on a timer | |
339 | * or a collision at boot hangs us. | |
340 | * Never set macii_state to idle here, or macii_start | |
341 | * won't be called again from send_request! | |
342 | * (need to re-check other cases ...) | |
343 | */ | |
344 | /* | |
345 | * if the interrupt handler set the need_poll | |
346 | * flag, it's hopefully a SRQ poll or re-Talk | |
347 | * so we try to send here anyway | |
348 | */ | |
349 | if (!need_poll) { | |
350 | if (console_loglevel == 10) | |
351 | printk("macii_start: device busy - retry %p state %d status %x!\n", | |
352 | req, macii_state, | |
353 | (uint) via[B] & (ST_MASK|TREQ)); | |
354 | retry_req = req; | |
355 | /* set ADB status here ? */ | |
356 | local_irq_restore(flags); | |
357 | return; | |
358 | } else { | |
359 | need_poll = 0; | |
360 | } | |
361 | } | |
362 | #endif | |
363 | /* | |
364 | * Another retry pending? (sanity check) | |
365 | */ | |
366 | if (retry_req) { | |
367 | retry_req = NULL; | |
368 | } | |
369 | ||
370 | /* Now send it. Be careful though, that first byte of the request */ | |
371 | /* is actually ADB_PACKET; the real data begins at index 1! */ | |
372 | ||
373 | /* store command byte */ | |
374 | command_byte = req->data[1]; | |
375 | /* Output mode */ | |
376 | via[ACR] |= SR_OUT; | |
377 | /* Load data */ | |
378 | via[SR] = req->data[1]; | |
379 | /* set ADB state to 'command' */ | |
380 | via[B] = (via[B] & ~ST_MASK) | ST_CMD; | |
381 | ||
382 | macii_state = sending; | |
383 | data_index = 2; | |
384 | ||
385 | local_irq_restore(flags); | |
386 | } | |
387 | ||
388 | /* | |
389 | * The notorious ADB interrupt handler - does all of the protocol handling, | |
390 | * except for starting new send operations. Relies heavily on the ADB | |
391 | * controller sending and receiving data, thereby generating SR interrupts | |
392 | * for us. This means there has to be always activity on the ADB bus, otherwise | |
393 | * the whole process dies and has to be re-kicked by sending TALK requests ... | |
394 | * CUDA-based Macs seem to solve this with the autopoll option, for MacII-type | |
395 | * ADB the problem isn't solved yet (retransmit of the latest active TALK seems | |
396 | * a good choice; either on timeout or on a timer interrupt). | |
397 | * | |
398 | * The basic ADB state machine was left unchanged from the original MacII code | |
399 | * by Alan Cox, which was based on the CUDA driver for PowerMac. | |
400 | * The syntax of the ADB status lines seems to be totally different on MacII, | |
401 | * though. MacII uses the states Command -> Even -> Odd -> Even ->...-> Idle for | |
402 | * sending, and Idle -> Even -> Odd -> Even ->...-> Idle for receiving. Start | |
403 | * and end of a receive packet are signaled by asserting /IRQ on the interrupt | |
404 | * line. Timeouts are signaled by a sequence of 4 0xFF, with /IRQ asserted on | |
405 | * every other byte. SRQ is probably signaled by 3 or more 0xFF tacked on the | |
406 | * end of a packet. (Thanks to Guido Koerber for eavesdropping on the ADB | |
407 | * protocol with a logic analyzer!!) | |
408 | * | |
409 | * Note: As of 21/10/97, the MacII ADB part works including timeout detection | |
410 | * and retransmit (Talk to the last active device). | |
411 | */ | |
7d12e780 | 412 | static irqreturn_t macii_interrupt(int irq, void *arg) |
1da177e4 LT |
413 | { |
414 | int x, adbdir; | |
415 | unsigned long flags; | |
416 | struct adb_request *req; | |
417 | ||
418 | last_status = status; | |
419 | ||
420 | /* prevent races due to SCSI enabling ints */ | |
421 | local_irq_save(flags); | |
422 | ||
423 | if (driver_running) { | |
424 | local_irq_restore(flags); | |
425 | return IRQ_NONE; | |
426 | } | |
427 | ||
428 | driver_running = 1; | |
429 | ||
430 | status = via[B] & (ST_MASK|TREQ); | |
431 | adbdir = via[ACR] & SR_OUT; | |
432 | ||
433 | switch (macii_state) { | |
434 | case idle: | |
435 | x = via[SR]; | |
436 | first_byte = x; | |
437 | /* set ADB state = even for first data byte */ | |
438 | via[B] = (via[B] & ~ST_MASK) | ST_EVEN; | |
439 | ||
440 | reply_buf[0] = first_byte; /* was command_byte?? */ | |
441 | reply_ptr = reply_buf + 1; | |
442 | reply_len = 1; | |
443 | prefix_len = 1; | |
444 | reading_reply = 0; | |
445 | ||
446 | macii_state = reading; | |
447 | break; | |
448 | ||
449 | case awaiting_reply: | |
450 | /* handshake etc. for II ?? */ | |
451 | x = via[SR]; | |
452 | first_byte = x; | |
453 | /* set ADB state = even for first data byte */ | |
454 | via[B] = (via[B] & ~ST_MASK) | ST_EVEN; | |
455 | ||
456 | current_req->reply[0] = first_byte; | |
457 | reply_ptr = current_req->reply + 1; | |
458 | reply_len = 1; | |
459 | prefix_len = 1; | |
460 | reading_reply = 1; | |
461 | ||
462 | macii_state = reading; | |
463 | break; | |
464 | ||
465 | case sending: | |
466 | req = current_req; | |
467 | if (data_index >= req->nbytes) { | |
468 | /* print an error message if a listen command has no data */ | |
469 | if (((command_byte & 0x0C) == 0x08) | |
470 | /* && (console_loglevel == 10) */ | |
471 | && (data_index == 2)) | |
472 | printk("MacII ADB: listen command with no data: %x!\n", | |
473 | command_byte); | |
474 | /* reset to shift in */ | |
475 | via[ACR] &= ~SR_OUT; | |
476 | x = via[SR]; | |
477 | /* set ADB state idle - might get SRQ */ | |
478 | via[B] = (via[B] & ~ST_MASK) | ST_IDLE; | |
479 | ||
480 | req->sent = 1; | |
481 | ||
482 | if (req->reply_expected) { | |
483 | macii_state = awaiting_reply; | |
484 | } else { | |
485 | req->complete = 1; | |
486 | current_req = req->next; | |
487 | if (req->done) (*req->done)(req); | |
488 | macii_state = idle; | |
489 | if (current_req || retry_req) | |
490 | macii_start(); | |
491 | else | |
492 | macii_retransmit((command_byte & 0xF0) >> 4); | |
493 | } | |
494 | } else { | |
495 | via[SR] = req->data[data_index++]; | |
496 | ||
497 | if ( (via[B] & ST_MASK) == ST_CMD ) { | |
498 | /* just sent the command byte, set to EVEN */ | |
499 | via[B] = (via[B] & ~ST_MASK) | ST_EVEN; | |
500 | } else { | |
501 | /* invert state bits, toggle ODD/EVEN */ | |
502 | via[B] ^= ST_MASK; | |
503 | } | |
504 | } | |
505 | break; | |
506 | ||
507 | case reading: | |
508 | ||
509 | /* timeout / SRQ handling for II hw */ | |
510 | if( (first_byte == 0xFF && (reply_len-prefix_len)==2 | |
511 | && memcmp(reply_ptr-2,"\xFF\xFF",2)==0) || | |
512 | ((reply_len-prefix_len)==3 | |
513 | && memcmp(reply_ptr-3,"\xFF\xFF\xFF",3)==0)) | |
514 | { | |
515 | /* | |
516 | * possible timeout (in fact, most probably a | |
517 | * timeout, since SRQ can't be signaled without | |
518 | * transfer on the bus). | |
519 | * The last three bytes seen were FF, together | |
520 | * with the starting byte (in case we started | |
521 | * on 'idle' or 'awaiting_reply') this probably | |
522 | * makes four. So this is mostl likely #5! | |
523 | * The timeout signal is a pattern 1 0 1 0 0.. | |
524 | * on /INT, meaning we missed it :-( | |
525 | */ | |
526 | x = via[SR]; | |
527 | if (x != 0xFF) printk("MacII ADB: mistaken timeout/SRQ!\n"); | |
528 | ||
529 | if ((status & TREQ) == (last_status & TREQ)) { | |
530 | /* Not a timeout. Unsolicited SRQ? weird. */ | |
531 | /* Terminate the SRQ packet and poll */ | |
532 | need_poll = 1; | |
533 | } | |
534 | /* There's no packet to get, so reply is blank */ | |
535 | via[B] ^= ST_MASK; | |
536 | reply_ptr -= (reply_len-prefix_len); | |
537 | reply_len = prefix_len; | |
538 | macii_state = read_done; | |
539 | break; | |
540 | } /* end timeout / SRQ handling for II hw. */ | |
541 | ||
542 | if((reply_len-prefix_len)>3 | |
543 | && memcmp(reply_ptr-3,"\xFF\xFF\xFF",3)==0) | |
544 | { | |
545 | /* SRQ tacked on data packet */ | |
546 | /* Terminate the packet (SRQ never ends) */ | |
547 | x = via[SR]; | |
548 | macii_state = read_done; | |
549 | reply_len -= 3; | |
550 | reply_ptr -= 3; | |
551 | need_poll = 1; | |
552 | /* need to continue; next byte not seen else */ | |
553 | } else { | |
554 | /* Sanity check */ | |
555 | if (reply_len > 15) reply_len = 0; | |
556 | /* read byte */ | |
557 | x = via[SR]; | |
558 | *reply_ptr = x; | |
559 | reply_ptr++; | |
560 | reply_len++; | |
561 | } | |
562 | /* The usual handshake ... */ | |
563 | ||
564 | /* | |
565 | * NetBSD hints that the next to last byte | |
566 | * is sent with IRQ !! | |
567 | * Guido found out it's the last one (0x0), | |
568 | * but IRQ should be asserted already. | |
569 | * Problem with timeout detection: First | |
570 | * transition to /IRQ might be second | |
571 | * byte of timeout packet! | |
572 | * Timeouts are signaled by 4x FF. | |
573 | */ | |
574 | if (((status & TREQ) == 0) && (x == 0x00)) { /* != 0xFF */ | |
575 | /* invert state bits, toggle ODD/EVEN */ | |
576 | via[B] ^= ST_MASK; | |
577 | ||
578 | /* adjust packet length */ | |
579 | reply_len--; | |
580 | reply_ptr--; | |
581 | macii_state = read_done; | |
582 | } else { | |
583 | /* not caught: ST_CMD */ | |
584 | /* required for re-entry 'reading'! */ | |
585 | if ((status & ST_MASK) == ST_IDLE) { | |
586 | /* (in)sanity check - set even */ | |
587 | via[B] = (via[B] & ~ST_MASK) | ST_EVEN; | |
588 | } else { | |
589 | /* invert state bits */ | |
590 | via[B] ^= ST_MASK; | |
591 | } | |
592 | } | |
593 | break; | |
594 | ||
595 | case read_done: | |
596 | x = via[SR]; | |
597 | if (reading_reply) { | |
598 | req = current_req; | |
599 | req->reply_len = reply_ptr - req->reply; | |
600 | req->complete = 1; | |
601 | current_req = req->next; | |
602 | if (req->done) (*req->done)(req); | |
603 | } else { | |
7d12e780 | 604 | adb_input(reply_buf, reply_ptr - reply_buf, 0); |
1da177e4 LT |
605 | } |
606 | ||
607 | /* | |
608 | * remember this device ID; it's the latest we got a | |
609 | * reply from! | |
610 | */ | |
611 | last_reply = command_byte; | |
612 | last_active = (command_byte & 0xF0) >> 4; | |
613 | ||
614 | /* SRQ seen before, initiate poll now */ | |
615 | if (need_poll) { | |
616 | macii_state = idle; | |
617 | macii_queue_poll(); | |
618 | need_poll = 0; | |
619 | break; | |
620 | } | |
621 | ||
622 | /* set ADB state to idle */ | |
623 | via[B] = (via[B] & ~ST_MASK) | ST_IDLE; | |
624 | ||
625 | /* /IRQ seen, so the ADB controller has data for us */ | |
626 | if ((via[B] & TREQ) != 0) { | |
627 | macii_state = reading; | |
628 | ||
629 | reply_buf[0] = command_byte; | |
630 | reply_ptr = reply_buf + 1; | |
631 | reply_len = 1; | |
632 | prefix_len = 1; | |
633 | reading_reply = 0; | |
634 | } else { | |
635 | /* no IRQ, send next packet or wait */ | |
636 | macii_state = idle; | |
637 | if (current_req) | |
638 | macii_start(); | |
639 | else | |
640 | macii_retransmit(last_active); | |
641 | } | |
642 | break; | |
643 | ||
644 | default: | |
645 | break; | |
646 | } | |
647 | /* reset mutex and interrupts */ | |
648 | driver_running = 0; | |
649 | local_irq_restore(flags); | |
650 | return IRQ_HANDLED; | |
651 | } |