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1da177e4 LT |
1 | /* |
2 | * Device driver for the via-cuda on Apple Powermacs. | |
3 | * | |
4 | * The VIA (versatile interface adapter) interfaces to the CUDA, | |
5 | * a 6805 microprocessor core which controls the ADB (Apple Desktop | |
6 | * Bus) which connects to the keyboard and mouse. The CUDA also | |
7 | * controls system power and the RTC (real time clock) chip. | |
8 | * | |
9 | * Copyright (C) 1996 Paul Mackerras. | |
10 | */ | |
11 | #include <stdarg.h> | |
1da177e4 LT |
12 | #include <linux/types.h> |
13 | #include <linux/errno.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/delay.h> | |
1da177e4 LT |
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> | |
1da177e4 LT |
26 | #include <asm/mac_via.h> |
27 | #endif | |
28 | #include <asm/io.h> | |
29 | #include <asm/system.h> | |
30 | #include <linux/init.h> | |
31 | ||
32 | static volatile unsigned char __iomem *via; | |
33 | static DEFINE_SPINLOCK(cuda_lock); | |
34 | ||
1da177e4 LT |
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 | /* Bits in B data register: all active low */ | |
55 | #define TREQ 0x08 /* Transfer request (input) */ | |
56 | #define TACK 0x10 /* Transfer acknowledge (output) */ | |
57 | #define TIP 0x20 /* Transfer in progress (output) */ | |
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 | ||
69 | static enum cuda_state { | |
70 | idle, | |
71 | sent_first_byte, | |
72 | sending, | |
73 | reading, | |
74 | read_done, | |
75 | awaiting_reply | |
76 | } cuda_state; | |
77 | ||
78 | static struct adb_request *current_req; | |
79 | static struct adb_request *last_req; | |
80 | static unsigned char cuda_rbuf[16]; | |
81 | static unsigned char *reply_ptr; | |
82 | static int reading_reply; | |
83 | static int data_index; | |
0251c38c | 84 | static int cuda_irq; |
1da177e4 LT |
85 | #ifdef CONFIG_PPC |
86 | static struct device_node *vias; | |
87 | #endif | |
87275856 | 88 | static int cuda_fully_inited; |
1da177e4 LT |
89 | |
90 | #ifdef CONFIG_ADB | |
91 | static int cuda_probe(void); | |
92 | static int cuda_init(void); | |
93 | static int cuda_send_request(struct adb_request *req, int sync); | |
94 | static int cuda_adb_autopoll(int devs); | |
95 | static int cuda_reset_adb_bus(void); | |
96 | #endif /* CONFIG_ADB */ | |
97 | ||
98 | static int cuda_init_via(void); | |
99 | static void cuda_start(void); | |
7d12e780 DH |
100 | static irqreturn_t cuda_interrupt(int irq, void *arg); |
101 | static void cuda_input(unsigned char *buf, int nb); | |
1da177e4 LT |
102 | void cuda_poll(void); |
103 | static int cuda_write(struct adb_request *req); | |
104 | ||
105 | int cuda_request(struct adb_request *req, | |
106 | void (*done)(struct adb_request *), int nbytes, ...); | |
107 | ||
108 | #ifdef CONFIG_ADB | |
109 | struct adb_driver via_cuda_driver = { | |
110 | "CUDA", | |
111 | cuda_probe, | |
112 | cuda_init, | |
113 | cuda_send_request, | |
114 | cuda_adb_autopoll, | |
115 | cuda_poll, | |
116 | cuda_reset_adb_bus | |
117 | }; | |
118 | #endif /* CONFIG_ADB */ | |
119 | ||
120 | #ifdef CONFIG_PPC | |
51d3082f | 121 | int __init find_via_cuda(void) |
1da177e4 | 122 | { |
1da177e4 | 123 | struct adb_request req; |
51d3082f | 124 | phys_addr_t taddr; |
018a3d1d | 125 | const u32 *reg; |
51d3082f | 126 | int err; |
1da177e4 LT |
127 | |
128 | if (vias != 0) | |
129 | return 1; | |
51d3082f | 130 | vias = of_find_node_by_name(NULL, "via-cuda"); |
1da177e4 LT |
131 | if (vias == 0) |
132 | return 0; | |
1da177e4 | 133 | |
01b2726d | 134 | reg = of_get_property(vias, "reg", NULL); |
51d3082f BH |
135 | if (reg == NULL) { |
136 | printk(KERN_ERR "via-cuda: No \"reg\" property !\n"); | |
137 | goto fail; | |
138 | } | |
139 | taddr = of_translate_address(vias, reg); | |
140 | if (taddr == 0) { | |
141 | printk(KERN_ERR "via-cuda: Can't translate address !\n"); | |
142 | goto fail; | |
143 | } | |
144 | via = ioremap(taddr, 0x2000); | |
145 | if (via == NULL) { | |
146 | printk(KERN_ERR "via-cuda: Can't map address !\n"); | |
147 | goto fail; | |
1da177e4 | 148 | } |
1da177e4 LT |
149 | |
150 | cuda_state = idle; | |
151 | sys_ctrler = SYS_CTRLER_CUDA; | |
152 | ||
153 | err = cuda_init_via(); | |
154 | if (err) { | |
155 | printk(KERN_ERR "cuda_init_via() failed\n"); | |
156 | via = NULL; | |
157 | return 0; | |
158 | } | |
159 | ||
160 | /* Clear and enable interrupts, but only on PPC. On 68K it's done */ | |
161 | /* for us by the main VIA driver in arch/m68k/mac/via.c */ | |
162 | ||
1da177e4 LT |
163 | out_8(&via[IFR], 0x7f); /* clear interrupts by writing 1s */ |
164 | out_8(&via[IER], IER_SET|SR_INT); /* enable interrupt from SR */ | |
1da177e4 LT |
165 | |
166 | /* enable autopoll */ | |
167 | cuda_request(&req, NULL, 3, CUDA_PACKET, CUDA_AUTOPOLL, 1); | |
168 | while (!req.complete) | |
169 | cuda_poll(); | |
170 | ||
171 | return 1; | |
51d3082f BH |
172 | |
173 | fail: | |
174 | of_node_put(vias); | |
175 | vias = NULL; | |
176 | return 0; | |
1da177e4 LT |
177 | } |
178 | #endif /* CONFIG_PPC */ | |
179 | ||
180 | static int __init via_cuda_start(void) | |
181 | { | |
182 | if (via == NULL) | |
183 | return -ENODEV; | |
184 | ||
0ebfff14 | 185 | #ifdef CONFIG_MAC |
0251c38c | 186 | cuda_irq = IRQ_MAC_ADB; |
0ebfff14 | 187 | #else /* CONFIG_MAC */ |
0251c38c FT |
188 | cuda_irq = irq_of_parse_and_map(vias, 0); |
189 | if (cuda_irq == NO_IRQ) { | |
0ebfff14 BH |
190 | printk(KERN_ERR "via-cuda: can't map interrupts for %s\n", |
191 | vias->full_name); | |
192 | return -ENODEV; | |
193 | } | |
0251c38c | 194 | #endif /* CONFIG_MAC */ |
0ebfff14 | 195 | |
0251c38c FT |
196 | if (request_irq(cuda_irq, cuda_interrupt, 0, "ADB", cuda_interrupt)) { |
197 | printk(KERN_ERR "via-cuda: can't request irq %d\n", cuda_irq); | |
1da177e4 LT |
198 | return -EAGAIN; |
199 | } | |
200 | ||
201 | printk("Macintosh CUDA driver v0.5 for Unified ADB.\n"); | |
202 | ||
203 | cuda_fully_inited = 1; | |
204 | return 0; | |
205 | } | |
206 | ||
207 | device_initcall(via_cuda_start); | |
208 | ||
209 | #ifdef CONFIG_ADB | |
210 | static int | |
211 | cuda_probe(void) | |
212 | { | |
213 | #ifdef CONFIG_PPC | |
214 | if (sys_ctrler != SYS_CTRLER_CUDA) | |
215 | return -ENODEV; | |
216 | #else | |
217 | if (macintosh_config->adb_type != MAC_ADB_CUDA) | |
218 | return -ENODEV; | |
219 | via = via1; | |
220 | #endif | |
221 | return 0; | |
222 | } | |
223 | ||
224 | static int __init | |
225 | cuda_init(void) | |
226 | { | |
227 | #ifdef CONFIG_PPC | |
228 | if (via == NULL) | |
229 | return -ENODEV; | |
230 | return 0; | |
231 | #else | |
232 | int err = cuda_init_via(); | |
233 | if (err) { | |
234 | printk(KERN_ERR "cuda_init_via() failed\n"); | |
235 | return -ENODEV; | |
236 | } | |
0251c38c | 237 | out_8(&via[IER], IER_SET|SR_INT); /* enable interrupt from SR */ |
1da177e4 LT |
238 | |
239 | return via_cuda_start(); | |
240 | #endif | |
241 | } | |
242 | #endif /* CONFIG_ADB */ | |
243 | ||
244 | #define WAIT_FOR(cond, what) \ | |
245 | do { \ | |
246 | int x; \ | |
247 | for (x = 1000; !(cond); --x) { \ | |
248 | if (x == 0) { \ | |
249 | printk("Timeout waiting for " what "\n"); \ | |
250 | return -ENXIO; \ | |
251 | } \ | |
252 | udelay(100); \ | |
253 | } \ | |
254 | } while (0) | |
255 | ||
256 | static int | |
257 | cuda_init_via(void) | |
258 | { | |
259 | out_8(&via[DIRB], (in_8(&via[DIRB]) | TACK | TIP) & ~TREQ); /* TACK & TIP out */ | |
260 | out_8(&via[B], in_8(&via[B]) | TACK | TIP); /* negate them */ | |
261 | out_8(&via[ACR] ,(in_8(&via[ACR]) & ~SR_CTRL) | SR_EXT); /* SR data in */ | |
262 | (void)in_8(&via[SR]); /* clear any left-over data */ | |
0251c38c | 263 | #ifdef CONFIG_PPC |
1da177e4 LT |
264 | out_8(&via[IER], 0x7f); /* disable interrupts from VIA */ |
265 | (void)in_8(&via[IER]); | |
0251c38c FT |
266 | #else |
267 | out_8(&via[IER], SR_INT); /* disable SR interrupt from VIA */ | |
1da177e4 LT |
268 | #endif |
269 | ||
270 | /* delay 4ms and then clear any pending interrupt */ | |
271 | mdelay(4); | |
272 | (void)in_8(&via[SR]); | |
0251c38c | 273 | out_8(&via[IFR], SR_INT); |
1da177e4 LT |
274 | |
275 | /* sync with the CUDA - assert TACK without TIP */ | |
276 | out_8(&via[B], in_8(&via[B]) & ~TACK); | |
277 | ||
278 | /* wait for the CUDA to assert TREQ in response */ | |
279 | WAIT_FOR((in_8(&via[B]) & TREQ) == 0, "CUDA response to sync"); | |
280 | ||
281 | /* wait for the interrupt and then clear it */ | |
282 | WAIT_FOR(in_8(&via[IFR]) & SR_INT, "CUDA response to sync (2)"); | |
283 | (void)in_8(&via[SR]); | |
0251c38c | 284 | out_8(&via[IFR], SR_INT); |
1da177e4 LT |
285 | |
286 | /* finish the sync by negating TACK */ | |
287 | out_8(&via[B], in_8(&via[B]) | TACK); | |
288 | ||
289 | /* wait for the CUDA to negate TREQ and the corresponding interrupt */ | |
290 | WAIT_FOR(in_8(&via[B]) & TREQ, "CUDA response to sync (3)"); | |
291 | WAIT_FOR(in_8(&via[IFR]) & SR_INT, "CUDA response to sync (4)"); | |
292 | (void)in_8(&via[SR]); | |
0251c38c | 293 | out_8(&via[IFR], SR_INT); |
1da177e4 LT |
294 | out_8(&via[B], in_8(&via[B]) | TIP); /* should be unnecessary */ |
295 | ||
296 | return 0; | |
297 | } | |
298 | ||
299 | #ifdef CONFIG_ADB | |
300 | /* Send an ADB command */ | |
301 | static int | |
302 | cuda_send_request(struct adb_request *req, int sync) | |
303 | { | |
304 | int i; | |
305 | ||
306 | if ((via == NULL) || !cuda_fully_inited) { | |
307 | req->complete = 1; | |
308 | return -ENXIO; | |
309 | } | |
310 | ||
311 | req->reply_expected = 1; | |
312 | ||
313 | i = cuda_write(req); | |
314 | if (i) | |
315 | return i; | |
316 | ||
317 | if (sync) { | |
318 | while (!req->complete) | |
319 | cuda_poll(); | |
320 | } | |
321 | return 0; | |
322 | } | |
323 | ||
324 | ||
325 | /* Enable/disable autopolling */ | |
326 | static int | |
327 | cuda_adb_autopoll(int devs) | |
328 | { | |
329 | struct adb_request req; | |
330 | ||
331 | if ((via == NULL) || !cuda_fully_inited) | |
332 | return -ENXIO; | |
333 | ||
334 | cuda_request(&req, NULL, 3, CUDA_PACKET, CUDA_AUTOPOLL, (devs? 1: 0)); | |
335 | while (!req.complete) | |
336 | cuda_poll(); | |
337 | return 0; | |
338 | } | |
339 | ||
340 | /* Reset adb bus - how do we do this?? */ | |
341 | static int | |
342 | cuda_reset_adb_bus(void) | |
343 | { | |
344 | struct adb_request req; | |
345 | ||
346 | if ((via == NULL) || !cuda_fully_inited) | |
347 | return -ENXIO; | |
348 | ||
349 | cuda_request(&req, NULL, 2, ADB_PACKET, 0); /* maybe? */ | |
350 | while (!req.complete) | |
351 | cuda_poll(); | |
352 | return 0; | |
353 | } | |
354 | #endif /* CONFIG_ADB */ | |
355 | /* Construct and send a cuda request */ | |
356 | int | |
357 | cuda_request(struct adb_request *req, void (*done)(struct adb_request *), | |
358 | int nbytes, ...) | |
359 | { | |
360 | va_list list; | |
361 | int i; | |
362 | ||
363 | if (via == NULL) { | |
364 | req->complete = 1; | |
365 | return -ENXIO; | |
366 | } | |
367 | ||
368 | req->nbytes = nbytes; | |
369 | req->done = done; | |
370 | va_start(list, nbytes); | |
371 | for (i = 0; i < nbytes; ++i) | |
372 | req->data[i] = va_arg(list, int); | |
373 | va_end(list); | |
374 | req->reply_expected = 1; | |
375 | return cuda_write(req); | |
376 | } | |
377 | ||
378 | static int | |
379 | cuda_write(struct adb_request *req) | |
380 | { | |
381 | unsigned long flags; | |
382 | ||
383 | if (req->nbytes < 2 || req->data[0] > CUDA_PACKET) { | |
384 | req->complete = 1; | |
385 | return -EINVAL; | |
386 | } | |
387 | req->next = NULL; | |
388 | req->sent = 0; | |
389 | req->complete = 0; | |
390 | req->reply_len = 0; | |
391 | ||
392 | spin_lock_irqsave(&cuda_lock, flags); | |
393 | if (current_req != 0) { | |
394 | last_req->next = req; | |
395 | last_req = req; | |
396 | } else { | |
397 | current_req = req; | |
398 | last_req = req; | |
399 | if (cuda_state == idle) | |
400 | cuda_start(); | |
401 | } | |
402 | spin_unlock_irqrestore(&cuda_lock, flags); | |
403 | ||
404 | return 0; | |
405 | } | |
406 | ||
407 | static void | |
408 | cuda_start(void) | |
409 | { | |
410 | struct adb_request *req; | |
411 | ||
412 | /* assert cuda_state == idle */ | |
413 | /* get the packet to send */ | |
414 | req = current_req; | |
415 | if (req == 0) | |
416 | return; | |
417 | if ((in_8(&via[B]) & TREQ) == 0) | |
418 | return; /* a byte is coming in from the CUDA */ | |
419 | ||
420 | /* set the shift register to shift out and send a byte */ | |
421 | out_8(&via[ACR], in_8(&via[ACR]) | SR_OUT); | |
422 | out_8(&via[SR], req->data[0]); | |
423 | out_8(&via[B], in_8(&via[B]) & ~TIP); | |
424 | cuda_state = sent_first_byte; | |
425 | } | |
426 | ||
427 | void | |
428 | cuda_poll(void) | |
429 | { | |
1da177e4 LT |
430 | /* cuda_interrupt only takes a normal lock, we disable |
431 | * interrupts here to avoid re-entering and thus deadlocking. | |
1da177e4 | 432 | */ |
0251c38c | 433 | disable_irq(cuda_irq); |
49f19ce4 | 434 | cuda_interrupt(0, NULL); |
0251c38c | 435 | enable_irq(cuda_irq); |
1da177e4 LT |
436 | } |
437 | ||
438 | static irqreturn_t | |
7d12e780 | 439 | cuda_interrupt(int irq, void *arg) |
1da177e4 LT |
440 | { |
441 | int status; | |
442 | struct adb_request *req = NULL; | |
443 | unsigned char ibuf[16]; | |
444 | int ibuf_len = 0; | |
445 | int complete = 0; | |
1da177e4 LT |
446 | |
447 | spin_lock(&cuda_lock); | |
448 | ||
0251c38c FT |
449 | /* On powermacs, this handler is registered for the VIA IRQ. But it uses |
450 | * just the shift register IRQ -- other VIA interrupt sources are disabled. | |
451 | * On m68k macs, the VIA IRQ sources are dispatched individually. Unless | |
452 | * we are polling, the shift register IRQ flag has already been cleared. | |
453 | */ | |
454 | ||
455 | #ifdef CONFIG_MAC | |
456 | if (!arg) | |
457 | #endif | |
458 | { | |
459 | if ((in_8(&via[IFR]) & SR_INT) == 0) { | |
460 | spin_unlock(&cuda_lock); | |
461 | return IRQ_NONE; | |
462 | } else { | |
463 | out_8(&via[IFR], SR_INT); | |
464 | } | |
1da177e4 LT |
465 | } |
466 | ||
467 | status = (~in_8(&via[B]) & (TIP|TREQ)) | (in_8(&via[ACR]) & SR_OUT); | |
468 | /* printk("cuda_interrupt: state=%d status=%x\n", cuda_state, status); */ | |
469 | switch (cuda_state) { | |
470 | case idle: | |
471 | /* CUDA has sent us the first byte of data - unsolicited */ | |
472 | if (status != TREQ) | |
473 | printk("cuda: state=idle, status=%x\n", status); | |
474 | (void)in_8(&via[SR]); | |
475 | out_8(&via[B], in_8(&via[B]) & ~TIP); | |
476 | cuda_state = reading; | |
477 | reply_ptr = cuda_rbuf; | |
478 | reading_reply = 0; | |
479 | break; | |
480 | ||
481 | case awaiting_reply: | |
482 | /* CUDA has sent us the first byte of data of a reply */ | |
483 | if (status != TREQ) | |
484 | printk("cuda: state=awaiting_reply, status=%x\n", status); | |
485 | (void)in_8(&via[SR]); | |
486 | out_8(&via[B], in_8(&via[B]) & ~TIP); | |
487 | cuda_state = reading; | |
488 | reply_ptr = current_req->reply; | |
489 | reading_reply = 1; | |
490 | break; | |
491 | ||
492 | case sent_first_byte: | |
493 | if (status == TREQ + TIP + SR_OUT) { | |
494 | /* collision */ | |
495 | out_8(&via[ACR], in_8(&via[ACR]) & ~SR_OUT); | |
496 | (void)in_8(&via[SR]); | |
497 | out_8(&via[B], in_8(&via[B]) | TIP | TACK); | |
498 | cuda_state = idle; | |
499 | } else { | |
500 | /* assert status == TIP + SR_OUT */ | |
501 | if (status != TIP + SR_OUT) | |
502 | printk("cuda: state=sent_first_byte status=%x\n", status); | |
503 | out_8(&via[SR], current_req->data[1]); | |
504 | out_8(&via[B], in_8(&via[B]) ^ TACK); | |
505 | data_index = 2; | |
506 | cuda_state = sending; | |
507 | } | |
508 | break; | |
509 | ||
510 | case sending: | |
511 | req = current_req; | |
512 | if (data_index >= req->nbytes) { | |
513 | out_8(&via[ACR], in_8(&via[ACR]) & ~SR_OUT); | |
514 | (void)in_8(&via[SR]); | |
515 | out_8(&via[B], in_8(&via[B]) | TACK | TIP); | |
516 | req->sent = 1; | |
517 | if (req->reply_expected) { | |
518 | cuda_state = awaiting_reply; | |
519 | } else { | |
520 | current_req = req->next; | |
521 | complete = 1; | |
522 | /* not sure about this */ | |
523 | cuda_state = idle; | |
524 | cuda_start(); | |
525 | } | |
526 | } else { | |
527 | out_8(&via[SR], req->data[data_index++]); | |
528 | out_8(&via[B], in_8(&via[B]) ^ TACK); | |
529 | } | |
530 | break; | |
531 | ||
532 | case reading: | |
533 | *reply_ptr++ = in_8(&via[SR]); | |
534 | if (status == TIP) { | |
535 | /* that's all folks */ | |
536 | out_8(&via[B], in_8(&via[B]) | TACK | TIP); | |
537 | cuda_state = read_done; | |
538 | } else { | |
539 | /* assert status == TIP | TREQ */ | |
540 | if (status != TIP + TREQ) | |
541 | printk("cuda: state=reading status=%x\n", status); | |
542 | out_8(&via[B], in_8(&via[B]) ^ TACK); | |
543 | } | |
544 | break; | |
545 | ||
546 | case read_done: | |
547 | (void)in_8(&via[SR]); | |
548 | if (reading_reply) { | |
549 | req = current_req; | |
550 | req->reply_len = reply_ptr - req->reply; | |
551 | if (req->data[0] == ADB_PACKET) { | |
552 | /* Have to adjust the reply from ADB commands */ | |
553 | if (req->reply_len <= 2 || (req->reply[1] & 2) != 0) { | |
554 | /* the 0x2 bit indicates no response */ | |
555 | req->reply_len = 0; | |
556 | } else { | |
557 | /* leave just the command and result bytes in the reply */ | |
558 | req->reply_len -= 2; | |
559 | memmove(req->reply, req->reply + 2, req->reply_len); | |
560 | } | |
561 | } | |
562 | current_req = req->next; | |
563 | complete = 1; | |
564 | } else { | |
565 | /* This is tricky. We must break the spinlock to call | |
566 | * cuda_input. However, doing so means we might get | |
567 | * re-entered from another CPU getting an interrupt | |
568 | * or calling cuda_poll(). I ended up using the stack | |
569 | * (it's only for 16 bytes) and moving the actual | |
570 | * call to cuda_input to outside of the lock. | |
571 | */ | |
572 | ibuf_len = reply_ptr - cuda_rbuf; | |
573 | memcpy(ibuf, cuda_rbuf, ibuf_len); | |
574 | } | |
575 | if (status == TREQ) { | |
576 | out_8(&via[B], in_8(&via[B]) & ~TIP); | |
577 | cuda_state = reading; | |
578 | reply_ptr = cuda_rbuf; | |
579 | reading_reply = 0; | |
580 | } else { | |
581 | cuda_state = idle; | |
582 | cuda_start(); | |
583 | } | |
584 | break; | |
585 | ||
586 | default: | |
587 | printk("cuda_interrupt: unknown cuda_state %d?\n", cuda_state); | |
588 | } | |
589 | spin_unlock(&cuda_lock); | |
590 | if (complete && req) { | |
591 | void (*done)(struct adb_request *) = req->done; | |
592 | mb(); | |
593 | req->complete = 1; | |
594 | /* Here, we assume that if the request has a done member, the | |
595 | * struct request will survive to setting req->complete to 1 | |
596 | */ | |
597 | if (done) | |
598 | (*done)(req); | |
599 | } | |
600 | if (ibuf_len) | |
7d12e780 | 601 | cuda_input(ibuf, ibuf_len); |
1da177e4 LT |
602 | return IRQ_HANDLED; |
603 | } | |
604 | ||
605 | static void | |
7d12e780 | 606 | cuda_input(unsigned char *buf, int nb) |
1da177e4 LT |
607 | { |
608 | int i; | |
609 | ||
610 | switch (buf[0]) { | |
611 | case ADB_PACKET: | |
612 | #ifdef CONFIG_XMON | |
613 | if (nb == 5 && buf[2] == 0x2c) { | |
614 | extern int xmon_wants_key, xmon_adb_keycode; | |
615 | if (xmon_wants_key) { | |
616 | xmon_adb_keycode = buf[3]; | |
617 | return; | |
618 | } | |
619 | } | |
620 | #endif /* CONFIG_XMON */ | |
621 | #ifdef CONFIG_ADB | |
7d12e780 | 622 | adb_input(buf+2, nb-2, buf[1] & 0x40); |
1da177e4 LT |
623 | #endif /* CONFIG_ADB */ |
624 | break; | |
625 | ||
626 | default: | |
627 | printk("data from cuda (%d bytes):", nb); | |
628 | for (i = 0; i < nb; ++i) | |
629 | printk(" %.2x", buf[i]); | |
630 | printk("\n"); | |
631 | } | |
632 | } |