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1da177e4 LT |
1 | /* |
2 | * 6522 Versatile Interface Adapter (VIA) | |
3 | * | |
4 | * There are two of these on the Mac II. Some IRQ's are vectored | |
5 | * via them as are assorted bits and bobs - eg RTC, ADB. | |
6 | * | |
7 | * CSA: Motorola seems to have removed documentation on the 6522 from | |
8 | * their web site; try | |
9 | * http://nerini.drf.com/vectrex/other/text/chips/6522/ | |
10 | * http://www.zymurgy.net/classic/vic20/vicdet1.htm | |
11 | * and | |
12 | * http://193.23.168.87/mikro_laborversuche/via_iobaustein/via6522_1.html | |
13 | * for info. A full-text web search on 6522 AND VIA will probably also | |
14 | * net some usefulness. <cananian@alumni.princeton.edu> 20apr1999 | |
15 | * | |
16 | * PRAM/RTC access algorithms are from the NetBSD RTC toolkit version 1.08b | |
17 | * by Erik Vogan and adapted to Linux by Joshua M. Thompson (funaho@jurai.org) | |
18 | * | |
19 | */ | |
20 | ||
21 | #include <linux/types.h> | |
22 | #include <linux/kernel.h> | |
23 | #include <linux/mm.h> | |
24 | #include <linux/delay.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/ide.h> | |
27 | ||
28 | #include <asm/traps.h> | |
29 | #include <asm/bootinfo.h> | |
30 | #include <asm/macintosh.h> | |
31 | #include <asm/macints.h> | |
32 | #include <asm/machw.h> | |
33 | #include <asm/mac_via.h> | |
34 | #include <asm/mac_psc.h> | |
35 | ||
36 | volatile __u8 *via1, *via2; | |
37 | #if 0 | |
38 | /* See note in mac_via.h about how this is possibly not useful */ | |
39 | volatile long *via_memory_bogon=(long *)&via_memory_bogon; | |
40 | #endif | |
41 | int rbv_present,via_alt_mapping; | |
42 | __u8 rbv_clear; | |
43 | ||
44 | /* | |
45 | * Globals for accessing the VIA chip registers without having to | |
46 | * check if we're hitting a real VIA or an RBV. Normally you could | |
47 | * just hit the combined register (ie, vIER|rIER) but that seems to | |
48 | * break on AV Macs...probably because they actually decode more than | |
49 | * eight address bits. Why can't Apple engineers at least be | |
50 | * _consistently_ lazy? - 1999-05-21 (jmt) | |
51 | */ | |
52 | ||
53 | static int gIER,gIFR,gBufA,gBufB; | |
54 | ||
55 | /* | |
56 | * Timer defs. | |
57 | */ | |
58 | ||
59 | #define TICK_SIZE 10000 | |
60 | #define MAC_CLOCK_TICK (783300/HZ) /* ticks per HZ */ | |
61 | #define MAC_CLOCK_LOW (MAC_CLOCK_TICK&0xFF) | |
62 | #define MAC_CLOCK_HIGH (MAC_CLOCK_TICK>>8) | |
63 | ||
64 | static int nubus_active; | |
65 | ||
66 | void via_debug_dump(void); | |
67 | irqreturn_t via1_irq(int, void *, struct pt_regs *); | |
68 | irqreturn_t via2_irq(int, void *, struct pt_regs *); | |
69 | irqreturn_t via_nubus_irq(int, void *, struct pt_regs *); | |
70 | void via_irq_enable(int irq); | |
71 | void via_irq_disable(int irq); | |
72 | void via_irq_clear(int irq); | |
73 | ||
74 | extern irqreturn_t mac_bang(int, void *, struct pt_regs *); | |
75 | extern irqreturn_t mac_scc_dispatch(int, void *, struct pt_regs *); | |
76 | extern int oss_present; | |
77 | ||
78 | /* | |
79 | * Initialize the VIAs | |
80 | * | |
81 | * First we figure out where they actually _are_ as well as what type of | |
82 | * VIA we have for VIA2 (it could be a real VIA or an RBV or even an OSS.) | |
83 | * Then we pretty much clear them out and disable all IRQ sources. | |
84 | * | |
85 | * Note: the OSS is actually "detected" here and not in oss_init(). It just | |
86 | * seems more logical to do it here since via_init() needs to know | |
87 | * these things anyways. | |
88 | */ | |
89 | ||
90 | void __init via_init(void) | |
91 | { | |
92 | switch(macintosh_config->via_type) { | |
93 | ||
94 | /* IIci, IIsi, IIvx, IIvi (P6xx), LC series */ | |
95 | ||
96 | case MAC_VIA_IIci: | |
97 | via1 = (void *) VIA1_BASE; | |
98 | if (macintosh_config->ident == MAC_MODEL_IIFX) { | |
99 | via2 = NULL; | |
100 | rbv_present = 0; | |
101 | oss_present = 1; | |
102 | } else { | |
103 | via2 = (void *) RBV_BASE; | |
104 | rbv_present = 1; | |
105 | oss_present = 0; | |
106 | } | |
107 | if (macintosh_config->ident == MAC_MODEL_LCIII) { | |
108 | rbv_clear = 0x00; | |
109 | } else { | |
110 | /* on most RBVs (& unlike the VIAs), you */ | |
111 | /* need to set bit 7 when you write to IFR */ | |
112 | /* in order for your clear to occur. */ | |
113 | rbv_clear = 0x80; | |
114 | } | |
115 | gIER = rIER; | |
116 | gIFR = rIFR; | |
117 | gBufA = rSIFR; | |
118 | gBufB = rBufB; | |
119 | break; | |
120 | ||
121 | /* Quadra and early MacIIs agree on the VIA locations */ | |
122 | ||
123 | case MAC_VIA_QUADRA: | |
124 | case MAC_VIA_II: | |
125 | via1 = (void *) VIA1_BASE; | |
126 | via2 = (void *) VIA2_BASE; | |
127 | rbv_present = 0; | |
128 | oss_present = 0; | |
129 | rbv_clear = 0x00; | |
130 | gIER = vIER; | |
131 | gIFR = vIFR; | |
132 | gBufA = vBufA; | |
133 | gBufB = vBufB; | |
134 | break; | |
135 | default: | |
136 | panic("UNKNOWN VIA TYPE"); | |
137 | } | |
138 | ||
139 | printk(KERN_INFO "VIA1 at %p is a 6522 or clone\n", via1); | |
140 | ||
141 | printk(KERN_INFO "VIA2 at %p is ", via2); | |
142 | if (rbv_present) { | |
143 | printk(KERN_INFO "an RBV\n"); | |
144 | } else if (oss_present) { | |
145 | printk(KERN_INFO "an OSS\n"); | |
146 | } else { | |
147 | printk(KERN_INFO "a 6522 or clone\n"); | |
148 | } | |
149 | ||
150 | #ifdef DEBUG_VIA | |
151 | via_debug_dump(); | |
152 | #endif | |
153 | ||
154 | /* | |
155 | * Shut down all IRQ sources, reset the timers, and | |
156 | * kill the timer latch on VIA1. | |
157 | */ | |
158 | ||
159 | via1[vIER] = 0x7F; | |
160 | via1[vIFR] = 0x7F; | |
161 | via1[vT1LL] = 0; | |
162 | via1[vT1LH] = 0; | |
163 | via1[vT1CL] = 0; | |
164 | via1[vT1CH] = 0; | |
165 | via1[vT2CL] = 0; | |
166 | via1[vT2CH] = 0; | |
167 | via1[vACR] &= 0x3F; | |
168 | ||
169 | /* | |
170 | * SE/30: disable video IRQ | |
171 | * XXX: testing for SE/30 VBL | |
172 | */ | |
173 | ||
174 | if (macintosh_config->ident == MAC_MODEL_SE30) { | |
175 | via1[vDirB] |= 0x40; | |
176 | via1[vBufB] |= 0x40; | |
177 | } | |
178 | ||
179 | /* | |
180 | * Set the RTC bits to a known state: all lines to outputs and | |
181 | * RTC disabled (yes that's 0 to enable and 1 to disable). | |
182 | */ | |
183 | ||
184 | via1[vDirB] |= (VIA1B_vRTCEnb | VIA1B_vRTCClk | VIA1B_vRTCData); | |
185 | via1[vBufB] |= (VIA1B_vRTCEnb | VIA1B_vRTCClk); | |
186 | ||
187 | /* Everything below this point is VIA2/RBV only... */ | |
188 | ||
189 | if (oss_present) return; | |
190 | ||
191 | #if 1 | |
192 | /* Some machines support an alternate IRQ mapping that spreads */ | |
193 | /* Ethernet and Sound out to their own autolevel IRQs and moves */ | |
194 | /* VIA1 to level 6. A/UX uses this mapping and we do too. Note */ | |
195 | /* that the IIfx emulates this alternate mapping using the OSS. */ | |
196 | ||
197 | switch(macintosh_config->ident) { | |
198 | case MAC_MODEL_C610: | |
199 | case MAC_MODEL_Q610: | |
200 | case MAC_MODEL_C650: | |
201 | case MAC_MODEL_Q650: | |
202 | case MAC_MODEL_Q700: | |
203 | case MAC_MODEL_Q800: | |
204 | case MAC_MODEL_Q900: | |
205 | case MAC_MODEL_Q950: | |
206 | via_alt_mapping = 1; | |
207 | via1[vDirB] |= 0x40; | |
208 | via1[vBufB] &= ~0x40; | |
209 | break; | |
210 | default: | |
211 | via_alt_mapping = 0; | |
212 | break; | |
213 | } | |
214 | #else | |
215 | /* The alernate IRQ mapping seems to just not work. Anyone with a */ | |
216 | /* supported machine is welcome to take a stab at fixing it. It */ | |
217 | /* _should_ work on the following Quadras: 610,650,700,800,900,950 */ | |
218 | /* - 1999-06-12 (jmt) */ | |
219 | ||
220 | via_alt_mapping = 0; | |
221 | #endif | |
222 | ||
223 | /* | |
224 | * Now initialize VIA2. For RBV we just kill all interrupts; | |
225 | * for a regular VIA we also reset the timers and stuff. | |
226 | */ | |
227 | ||
228 | via2[gIER] = 0x7F; | |
229 | via2[gIFR] = 0x7F | rbv_clear; | |
230 | if (!rbv_present) { | |
231 | via2[vT1LL] = 0; | |
232 | via2[vT1LH] = 0; | |
233 | via2[vT1CL] = 0; | |
234 | via2[vT1CH] = 0; | |
235 | via2[vT2CL] = 0; | |
236 | via2[vT2CH] = 0; | |
237 | via2[vACR] &= 0x3F; | |
238 | } | |
239 | } | |
240 | ||
241 | /* | |
242 | * Start the 100 Hz clock | |
243 | */ | |
244 | ||
245 | void __init via_init_clock(irqreturn_t (*func)(int, void *, struct pt_regs *)) | |
246 | { | |
247 | via1[vACR] |= 0x40; | |
248 | via1[vT1LL] = MAC_CLOCK_LOW; | |
249 | via1[vT1LH] = MAC_CLOCK_HIGH; | |
250 | via1[vT1CL] = MAC_CLOCK_LOW; | |
251 | via1[vT1CH] = MAC_CLOCK_HIGH; | |
252 | ||
253 | request_irq(IRQ_MAC_TIMER_1, func, IRQ_FLG_LOCK, "timer", func); | |
254 | } | |
255 | ||
256 | /* | |
257 | * Register the interrupt dispatchers for VIA or RBV machines only. | |
258 | */ | |
259 | ||
260 | void __init via_register_interrupts(void) | |
261 | { | |
262 | if (via_alt_mapping) { | |
263 | cpu_request_irq(IRQ_AUTO_1, via1_irq, | |
264 | IRQ_FLG_LOCK|IRQ_FLG_FAST, "software", | |
265 | (void *) via1); | |
266 | cpu_request_irq(IRQ_AUTO_6, via1_irq, | |
267 | IRQ_FLG_LOCK|IRQ_FLG_FAST, "via1", | |
268 | (void *) via1); | |
269 | } else { | |
270 | cpu_request_irq(IRQ_AUTO_1, via1_irq, | |
271 | IRQ_FLG_LOCK|IRQ_FLG_FAST, "via1", | |
272 | (void *) via1); | |
273 | #if 0 /* interferes with serial on some machines */ | |
274 | if (!psc_present) { | |
275 | cpu_request_irq(IRQ_AUTO_6, mac_bang, IRQ_FLG_LOCK, | |
276 | "Off Switch", mac_bang); | |
277 | } | |
278 | #endif | |
279 | } | |
280 | cpu_request_irq(IRQ_AUTO_2, via2_irq, IRQ_FLG_LOCK|IRQ_FLG_FAST, | |
281 | "via2", (void *) via2); | |
282 | if (!psc_present) { | |
283 | cpu_request_irq(IRQ_AUTO_4, mac_scc_dispatch, IRQ_FLG_LOCK, | |
284 | "scc", mac_scc_dispatch); | |
285 | } | |
286 | request_irq(IRQ_MAC_NUBUS, via_nubus_irq, IRQ_FLG_LOCK|IRQ_FLG_FAST, | |
287 | "nubus", (void *) via2); | |
288 | } | |
289 | ||
290 | /* | |
291 | * Debugging dump, used in various places to see what's going on. | |
292 | */ | |
293 | ||
294 | void via_debug_dump(void) | |
295 | { | |
296 | printk(KERN_DEBUG "VIA1: DDRA = 0x%02X DDRB = 0x%02X ACR = 0x%02X\n", | |
297 | (uint) via1[vDirA], (uint) via1[vDirB], (uint) via1[vACR]); | |
298 | printk(KERN_DEBUG " PCR = 0x%02X IFR = 0x%02X IER = 0x%02X\n", | |
299 | (uint) via1[vPCR], (uint) via1[vIFR], (uint) via1[vIER]); | |
300 | if (oss_present) { | |
301 | printk(KERN_DEBUG "VIA2: <OSS>\n"); | |
302 | } else if (rbv_present) { | |
303 | printk(KERN_DEBUG "VIA2: IFR = 0x%02X IER = 0x%02X\n", | |
304 | (uint) via2[rIFR], (uint) via2[rIER]); | |
305 | printk(KERN_DEBUG " SIFR = 0x%02X SIER = 0x%02X\n", | |
306 | (uint) via2[rSIFR], (uint) via2[rSIER]); | |
307 | } else { | |
308 | printk(KERN_DEBUG "VIA2: DDRA = 0x%02X DDRB = 0x%02X ACR = 0x%02X\n", | |
309 | (uint) via2[vDirA], (uint) via2[vDirB], | |
310 | (uint) via2[vACR]); | |
311 | printk(KERN_DEBUG " PCR = 0x%02X IFR = 0x%02X IER = 0x%02X\n", | |
312 | (uint) via2[vPCR], | |
313 | (uint) via2[vIFR], (uint) via2[vIER]); | |
314 | } | |
315 | } | |
316 | ||
317 | /* | |
318 | * This is always executed with interrupts disabled. | |
319 | * | |
320 | * TBI: get time offset between scheduling timer ticks | |
321 | */ | |
322 | ||
323 | unsigned long mac_gettimeoffset (void) | |
324 | { | |
325 | unsigned long ticks, offset = 0; | |
326 | ||
327 | /* read VIA1 timer 2 current value */ | |
328 | ticks = via1[vT1CL] | (via1[vT1CH] << 8); | |
329 | /* The probability of underflow is less than 2% */ | |
330 | if (ticks > MAC_CLOCK_TICK - MAC_CLOCK_TICK / 50) | |
331 | /* Check for pending timer interrupt in VIA1 IFR */ | |
332 | if (via1[vIFR] & 0x40) offset = TICK_SIZE; | |
333 | ||
334 | ticks = MAC_CLOCK_TICK - ticks; | |
335 | ticks = ticks * 10000L / MAC_CLOCK_TICK; | |
336 | ||
337 | return ticks + offset; | |
338 | } | |
339 | ||
340 | /* | |
341 | * Flush the L2 cache on Macs that have it by flipping | |
342 | * the system into 24-bit mode for an instant. | |
343 | */ | |
344 | ||
345 | void via_flush_cache(void) | |
346 | { | |
347 | via2[gBufB] &= ~VIA2B_vMode32; | |
348 | via2[gBufB] |= VIA2B_vMode32; | |
349 | } | |
350 | ||
351 | /* | |
352 | * Return the status of the L2 cache on a IIci | |
353 | */ | |
354 | ||
355 | int via_get_cache_disable(void) | |
356 | { | |
357 | /* Safeguard against being called accidentally */ | |
358 | if (!via2) { | |
359 | printk(KERN_ERR "via_get_cache_disable called on a non-VIA machine!\n"); | |
360 | return 1; | |
361 | } | |
362 | ||
363 | return (int) via2[gBufB] & VIA2B_vCDis; | |
364 | } | |
365 | ||
366 | /* | |
367 | * Initialize VIA2 for Nubus access | |
368 | */ | |
369 | ||
370 | void __init via_nubus_init(void) | |
371 | { | |
372 | /* don't set nubus_active = 0 here, it kills the Baboon */ | |
373 | /* interrupt that we've already registered. */ | |
374 | ||
375 | /* unlock nubus transactions */ | |
376 | ||
377 | if (!rbv_present) { | |
378 | /* set the line to be an output on non-RBV machines */ | |
379 | if ((macintosh_config->adb_type != MAC_ADB_PB1) && | |
380 | (macintosh_config->adb_type != MAC_ADB_PB2)) { | |
381 | via2[vDirB] |= 0x02; | |
382 | } | |
383 | } | |
384 | ||
385 | /* this seems to be an ADB bit on PMU machines */ | |
386 | /* according to MkLinux. -- jmt */ | |
387 | ||
388 | if ((macintosh_config->adb_type != MAC_ADB_PB1) && | |
389 | (macintosh_config->adb_type != MAC_ADB_PB2)) { | |
390 | via2[gBufB] |= 0x02; | |
391 | } | |
392 | ||
393 | /* disable nubus slot interrupts. */ | |
394 | if (rbv_present) { | |
395 | via2[rSIER] = 0x7F; | |
396 | via2[rSIER] = nubus_active | 0x80; | |
397 | } else { | |
398 | /* These are ADB bits on PMU */ | |
399 | if ((macintosh_config->adb_type != MAC_ADB_PB1) && | |
400 | (macintosh_config->adb_type != MAC_ADB_PB2)) { | |
401 | switch(macintosh_config->ident) | |
402 | { | |
403 | case MAC_MODEL_II: | |
404 | case MAC_MODEL_IIX: | |
405 | case MAC_MODEL_IICX: | |
406 | case MAC_MODEL_SE30: | |
407 | via2[vBufA] |= 0x3F; | |
408 | via2[vDirA] = ~nubus_active | 0xc0; | |
409 | break; | |
410 | default: | |
411 | via2[vBufA] = 0xFF; | |
412 | via2[vDirA] = ~nubus_active; | |
413 | } | |
414 | } | |
415 | } | |
416 | } | |
417 | ||
418 | /* | |
419 | * The generic VIA interrupt routines (shamelessly stolen from Alan Cox's | |
420 | * via6522.c :-), disable/pending masks added. | |
421 | * | |
422 | * The new interrupt architecture in macints.c takes care of a lot of the | |
423 | * gruntwork for us, including tallying the interrupts and calling the | |
424 | * handlers on the linked list. All we need to do here is basically generate | |
425 | * the machspec interrupt number after clearing the interrupt. | |
426 | */ | |
427 | ||
428 | irqreturn_t via1_irq(int irq, void *dev_id, struct pt_regs *regs) | |
429 | { | |
430 | int irq_bit, i; | |
431 | unsigned char events, mask; | |
432 | ||
433 | mask = via1[vIER] & 0x7F; | |
434 | if (!(events = via1[vIFR] & mask)) | |
435 | return IRQ_NONE; | |
436 | ||
437 | for (i = 0, irq_bit = 1 ; i < 7 ; i++, irq_bit <<= 1) | |
438 | if (events & irq_bit) { | |
439 | via1[vIER] = irq_bit; | |
440 | mac_do_irq_list(VIA1_SOURCE_BASE + i, regs); | |
441 | via1[vIFR] = irq_bit; | |
442 | via1[vIER] = irq_bit | 0x80; | |
443 | } | |
444 | ||
445 | #if 0 /* freakin' pmu is doing weird stuff */ | |
446 | if (!oss_present) { | |
447 | /* This (still) seems to be necessary to get IDE | |
448 | working. However, if you enable VBL interrupts, | |
449 | you're screwed... */ | |
450 | /* FIXME: should we check the SLOTIRQ bit before | |
451 | pulling this stunt? */ | |
452 | /* No, it won't be set. that's why we're doing this. */ | |
453 | via_irq_disable(IRQ_MAC_NUBUS); | |
454 | via_irq_clear(IRQ_MAC_NUBUS); | |
455 | mac_do_irq_list(IRQ_MAC_NUBUS, regs); | |
456 | via_irq_enable(IRQ_MAC_NUBUS); | |
457 | } | |
458 | #endif | |
459 | return IRQ_HANDLED; | |
460 | } | |
461 | ||
462 | irqreturn_t via2_irq(int irq, void *dev_id, struct pt_regs *regs) | |
463 | { | |
464 | int irq_bit, i; | |
465 | unsigned char events, mask; | |
466 | ||
467 | mask = via2[gIER] & 0x7F; | |
468 | if (!(events = via2[gIFR] & mask)) | |
469 | return IRQ_NONE; | |
470 | ||
471 | for (i = 0, irq_bit = 1 ; i < 7 ; i++, irq_bit <<= 1) | |
472 | if (events & irq_bit) { | |
473 | via2[gIER] = irq_bit; | |
474 | mac_do_irq_list(VIA2_SOURCE_BASE + i, regs); | |
475 | via2[gIFR] = irq_bit | rbv_clear; | |
476 | via2[gIER] = irq_bit | 0x80; | |
477 | } | |
478 | return IRQ_HANDLED; | |
479 | } | |
480 | ||
481 | /* | |
482 | * Dispatch Nubus interrupts. We are called as a secondary dispatch by the | |
483 | * VIA2 dispatcher as a fast interrupt handler. | |
484 | */ | |
485 | ||
486 | irqreturn_t via_nubus_irq(int irq, void *dev_id, struct pt_regs *regs) | |
487 | { | |
488 | int irq_bit, i; | |
489 | unsigned char events; | |
490 | ||
491 | if (!(events = ~via2[gBufA] & nubus_active)) | |
492 | return IRQ_NONE; | |
493 | ||
494 | for (i = 0, irq_bit = 1 ; i < 7 ; i++, irq_bit <<= 1) { | |
495 | if (events & irq_bit) { | |
496 | via_irq_disable(NUBUS_SOURCE_BASE + i); | |
497 | mac_do_irq_list(NUBUS_SOURCE_BASE + i, regs); | |
498 | via_irq_enable(NUBUS_SOURCE_BASE + i); | |
499 | } | |
500 | } | |
501 | return IRQ_HANDLED; | |
502 | } | |
503 | ||
504 | void via_irq_enable(int irq) { | |
505 | int irq_src = IRQ_SRC(irq); | |
506 | int irq_idx = IRQ_IDX(irq); | |
507 | int irq_bit = 1 << irq_idx; | |
508 | ||
509 | #ifdef DEBUG_IRQUSE | |
510 | printk(KERN_DEBUG "via_irq_enable(%d)\n", irq); | |
511 | #endif | |
512 | ||
513 | if (irq_src == 1) { | |
514 | via1[vIER] = irq_bit | 0x80; | |
515 | } else if (irq_src == 2) { | |
516 | /* | |
517 | * Set vPCR for SCSI interrupts (but not on RBV) | |
518 | */ | |
519 | if ((irq_idx == 0) && !rbv_present) { | |
520 | if (macintosh_config->scsi_type == MAC_SCSI_OLD) { | |
521 | /* CB2 (IRQ) indep. input, positive edge */ | |
522 | /* CA2 (DRQ) indep. input, positive edge */ | |
523 | via2[vPCR] = 0x66; | |
524 | } else { | |
525 | /* CB2 (IRQ) indep. input, negative edge */ | |
526 | /* CA2 (DRQ) indep. input, negative edge */ | |
527 | via2[vPCR] = 0x22; | |
528 | } | |
529 | } | |
530 | via2[gIER] = irq_bit | 0x80; | |
531 | } else if (irq_src == 7) { | |
532 | if (rbv_present) { | |
533 | /* enable the slot interrupt. SIER works like IER. */ | |
534 | via2[rSIER] = IER_SET_BIT(irq_idx); | |
535 | } else { | |
536 | /* Make sure the bit is an input, to enable the irq */ | |
537 | /* But not on PowerBooks, that's ADB... */ | |
538 | if ((macintosh_config->adb_type != MAC_ADB_PB1) && | |
539 | (macintosh_config->adb_type != MAC_ADB_PB2)) { | |
540 | switch(macintosh_config->ident) | |
541 | { | |
542 | case MAC_MODEL_II: | |
543 | case MAC_MODEL_IIX: | |
544 | case MAC_MODEL_IICX: | |
545 | case MAC_MODEL_SE30: | |
546 | via2[vDirA] &= (~irq_bit | 0xc0); | |
547 | break; | |
548 | default: | |
549 | via2[vDirA] &= ~irq_bit; | |
550 | } | |
551 | } | |
552 | } | |
553 | nubus_active |= irq_bit; | |
554 | } | |
555 | } | |
556 | ||
557 | void via_irq_disable(int irq) { | |
558 | int irq_src = IRQ_SRC(irq); | |
559 | int irq_idx = IRQ_IDX(irq); | |
560 | int irq_bit = 1 << irq_idx; | |
561 | ||
562 | #ifdef DEBUG_IRQUSE | |
563 | printk(KERN_DEBUG "via_irq_disable(%d)\n", irq); | |
564 | #endif | |
565 | ||
566 | if (irq_src == 1) { | |
567 | via1[vIER] = irq_bit; | |
568 | } else if (irq_src == 2) { | |
569 | via2[gIER] = irq_bit; | |
570 | } else if (irq_src == 7) { | |
571 | if (rbv_present) { | |
572 | /* disable the slot interrupt. SIER works like IER. */ | |
573 | via2[rSIER] = IER_CLR_BIT(irq_idx); | |
574 | } else { | |
575 | /* disable the nubus irq by changing dir to output */ | |
576 | /* except on PMU */ | |
577 | if ((macintosh_config->adb_type != MAC_ADB_PB1) && | |
578 | (macintosh_config->adb_type != MAC_ADB_PB2)) { | |
579 | via2[vDirA] |= irq_bit; | |
580 | } | |
581 | } | |
582 | nubus_active &= ~irq_bit; | |
583 | } | |
584 | } | |
585 | ||
586 | void via_irq_clear(int irq) { | |
587 | int irq_src = IRQ_SRC(irq); | |
588 | int irq_idx = IRQ_IDX(irq); | |
589 | int irq_bit = 1 << irq_idx; | |
590 | ||
591 | if (irq_src == 1) { | |
592 | via1[vIFR] = irq_bit; | |
593 | } else if (irq_src == 2) { | |
594 | via2[gIFR] = irq_bit | rbv_clear; | |
595 | } else if (irq_src == 7) { | |
596 | /* FIXME: hmm.. */ | |
597 | } | |
598 | } | |
599 | ||
600 | /* | |
601 | * Returns nonzero if an interrupt is pending on the given | |
602 | * VIA/IRQ combination. | |
603 | */ | |
604 | ||
605 | int via_irq_pending(int irq) | |
606 | { | |
607 | int irq_src = IRQ_SRC(irq); | |
608 | int irq_idx = IRQ_IDX(irq); | |
609 | int irq_bit = 1 << irq_idx; | |
610 | ||
611 | if (irq_src == 1) { | |
612 | return via1[vIFR] & irq_bit; | |
613 | } else if (irq_src == 2) { | |
614 | return via2[gIFR] & irq_bit; | |
615 | } else if (irq_src == 7) { | |
616 | return ~via2[gBufA] & irq_bit; | |
617 | } | |
618 | return 0; | |
619 | } |