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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 | ||
1da177e4 LT |
28 | #include <asm/bootinfo.h> |
29 | #include <asm/macintosh.h> | |
30 | #include <asm/macints.h> | |
31 | #include <asm/machw.h> | |
32 | #include <asm/mac_via.h> | |
33 | #include <asm/mac_psc.h> | |
34 | ||
35 | volatile __u8 *via1, *via2; | |
36 | #if 0 | |
37 | /* See note in mac_via.h about how this is possibly not useful */ | |
38 | volatile long *via_memory_bogon=(long *)&via_memory_bogon; | |
39 | #endif | |
40 | int rbv_present,via_alt_mapping; | |
41 | __u8 rbv_clear; | |
42 | ||
43 | /* | |
44 | * Globals for accessing the VIA chip registers without having to | |
45 | * check if we're hitting a real VIA or an RBV. Normally you could | |
46 | * just hit the combined register (ie, vIER|rIER) but that seems to | |
47 | * break on AV Macs...probably because they actually decode more than | |
48 | * eight address bits. Why can't Apple engineers at least be | |
49 | * _consistently_ lazy? - 1999-05-21 (jmt) | |
50 | */ | |
51 | ||
52 | static int gIER,gIFR,gBufA,gBufB; | |
53 | ||
54 | /* | |
55 | * Timer defs. | |
56 | */ | |
57 | ||
58 | #define TICK_SIZE 10000 | |
59 | #define MAC_CLOCK_TICK (783300/HZ) /* ticks per HZ */ | |
60 | #define MAC_CLOCK_LOW (MAC_CLOCK_TICK&0xFF) | |
61 | #define MAC_CLOCK_HIGH (MAC_CLOCK_TICK>>8) | |
62 | ||
63 | static int nubus_active; | |
64 | ||
65 | void via_debug_dump(void); | |
66 | irqreturn_t via1_irq(int, void *, struct pt_regs *); | |
67 | irqreturn_t via2_irq(int, void *, struct pt_regs *); | |
68 | irqreturn_t via_nubus_irq(int, void *, struct pt_regs *); | |
69 | void via_irq_enable(int irq); | |
70 | void via_irq_disable(int irq); | |
71 | void via_irq_clear(int irq); | |
72 | ||
1da177e4 LT |
73 | extern irqreturn_t mac_scc_dispatch(int, void *, struct pt_regs *); |
74 | extern int oss_present; | |
75 | ||
76 | /* | |
77 | * Initialize the VIAs | |
78 | * | |
79 | * First we figure out where they actually _are_ as well as what type of | |
80 | * VIA we have for VIA2 (it could be a real VIA or an RBV or even an OSS.) | |
81 | * Then we pretty much clear them out and disable all IRQ sources. | |
82 | * | |
83 | * Note: the OSS is actually "detected" here and not in oss_init(). It just | |
84 | * seems more logical to do it here since via_init() needs to know | |
85 | * these things anyways. | |
86 | */ | |
87 | ||
88 | void __init via_init(void) | |
89 | { | |
90 | switch(macintosh_config->via_type) { | |
91 | ||
92 | /* IIci, IIsi, IIvx, IIvi (P6xx), LC series */ | |
93 | ||
94 | case MAC_VIA_IIci: | |
95 | via1 = (void *) VIA1_BASE; | |
96 | if (macintosh_config->ident == MAC_MODEL_IIFX) { | |
97 | via2 = NULL; | |
98 | rbv_present = 0; | |
99 | oss_present = 1; | |
100 | } else { | |
101 | via2 = (void *) RBV_BASE; | |
102 | rbv_present = 1; | |
103 | oss_present = 0; | |
104 | } | |
105 | if (macintosh_config->ident == MAC_MODEL_LCIII) { | |
106 | rbv_clear = 0x00; | |
107 | } else { | |
108 | /* on most RBVs (& unlike the VIAs), you */ | |
109 | /* need to set bit 7 when you write to IFR */ | |
110 | /* in order for your clear to occur. */ | |
111 | rbv_clear = 0x80; | |
112 | } | |
113 | gIER = rIER; | |
114 | gIFR = rIFR; | |
115 | gBufA = rSIFR; | |
116 | gBufB = rBufB; | |
117 | break; | |
118 | ||
119 | /* Quadra and early MacIIs agree on the VIA locations */ | |
120 | ||
121 | case MAC_VIA_QUADRA: | |
122 | case MAC_VIA_II: | |
123 | via1 = (void *) VIA1_BASE; | |
124 | via2 = (void *) VIA2_BASE; | |
125 | rbv_present = 0; | |
126 | oss_present = 0; | |
127 | rbv_clear = 0x00; | |
128 | gIER = vIER; | |
129 | gIFR = vIFR; | |
130 | gBufA = vBufA; | |
131 | gBufB = vBufB; | |
132 | break; | |
133 | default: | |
134 | panic("UNKNOWN VIA TYPE"); | |
135 | } | |
136 | ||
137 | printk(KERN_INFO "VIA1 at %p is a 6522 or clone\n", via1); | |
138 | ||
139 | printk(KERN_INFO "VIA2 at %p is ", via2); | |
140 | if (rbv_present) { | |
141 | printk(KERN_INFO "an RBV\n"); | |
142 | } else if (oss_present) { | |
143 | printk(KERN_INFO "an OSS\n"); | |
144 | } else { | |
145 | printk(KERN_INFO "a 6522 or clone\n"); | |
146 | } | |
147 | ||
148 | #ifdef DEBUG_VIA | |
149 | via_debug_dump(); | |
150 | #endif | |
151 | ||
152 | /* | |
153 | * Shut down all IRQ sources, reset the timers, and | |
154 | * kill the timer latch on VIA1. | |
155 | */ | |
156 | ||
157 | via1[vIER] = 0x7F; | |
158 | via1[vIFR] = 0x7F; | |
159 | via1[vT1LL] = 0; | |
160 | via1[vT1LH] = 0; | |
161 | via1[vT1CL] = 0; | |
162 | via1[vT1CH] = 0; | |
163 | via1[vT2CL] = 0; | |
164 | via1[vT2CH] = 0; | |
165 | via1[vACR] &= 0x3F; | |
166 | ||
167 | /* | |
168 | * SE/30: disable video IRQ | |
169 | * XXX: testing for SE/30 VBL | |
170 | */ | |
171 | ||
172 | if (macintosh_config->ident == MAC_MODEL_SE30) { | |
173 | via1[vDirB] |= 0x40; | |
174 | via1[vBufB] |= 0x40; | |
175 | } | |
176 | ||
177 | /* | |
178 | * Set the RTC bits to a known state: all lines to outputs and | |
179 | * RTC disabled (yes that's 0 to enable and 1 to disable). | |
180 | */ | |
181 | ||
182 | via1[vDirB] |= (VIA1B_vRTCEnb | VIA1B_vRTCClk | VIA1B_vRTCData); | |
183 | via1[vBufB] |= (VIA1B_vRTCEnb | VIA1B_vRTCClk); | |
184 | ||
185 | /* Everything below this point is VIA2/RBV only... */ | |
186 | ||
187 | if (oss_present) return; | |
188 | ||
189 | #if 1 | |
190 | /* Some machines support an alternate IRQ mapping that spreads */ | |
191 | /* Ethernet and Sound out to their own autolevel IRQs and moves */ | |
192 | /* VIA1 to level 6. A/UX uses this mapping and we do too. Note */ | |
193 | /* that the IIfx emulates this alternate mapping using the OSS. */ | |
194 | ||
195 | switch(macintosh_config->ident) { | |
196 | case MAC_MODEL_C610: | |
197 | case MAC_MODEL_Q610: | |
198 | case MAC_MODEL_C650: | |
199 | case MAC_MODEL_Q650: | |
200 | case MAC_MODEL_Q700: | |
201 | case MAC_MODEL_Q800: | |
202 | case MAC_MODEL_Q900: | |
203 | case MAC_MODEL_Q950: | |
204 | via_alt_mapping = 1; | |
205 | via1[vDirB] |= 0x40; | |
206 | via1[vBufB] &= ~0x40; | |
207 | break; | |
208 | default: | |
209 | via_alt_mapping = 0; | |
210 | break; | |
211 | } | |
212 | #else | |
1da177e4 LT |
213 | via_alt_mapping = 0; |
214 | #endif | |
215 | ||
216 | /* | |
217 | * Now initialize VIA2. For RBV we just kill all interrupts; | |
218 | * for a regular VIA we also reset the timers and stuff. | |
219 | */ | |
220 | ||
221 | via2[gIER] = 0x7F; | |
222 | via2[gIFR] = 0x7F | rbv_clear; | |
223 | if (!rbv_present) { | |
224 | via2[vT1LL] = 0; | |
225 | via2[vT1LH] = 0; | |
226 | via2[vT1CL] = 0; | |
227 | via2[vT1CH] = 0; | |
228 | via2[vT2CL] = 0; | |
229 | via2[vT2CH] = 0; | |
230 | via2[vACR] &= 0x3F; | |
231 | } | |
232 | } | |
233 | ||
234 | /* | |
235 | * Start the 100 Hz clock | |
236 | */ | |
237 | ||
238 | void __init via_init_clock(irqreturn_t (*func)(int, void *, struct pt_regs *)) | |
239 | { | |
240 | via1[vACR] |= 0x40; | |
241 | via1[vT1LL] = MAC_CLOCK_LOW; | |
242 | via1[vT1LH] = MAC_CLOCK_HIGH; | |
243 | via1[vT1CL] = MAC_CLOCK_LOW; | |
244 | via1[vT1CH] = MAC_CLOCK_HIGH; | |
245 | ||
246 | request_irq(IRQ_MAC_TIMER_1, func, IRQ_FLG_LOCK, "timer", func); | |
247 | } | |
248 | ||
249 | /* | |
250 | * Register the interrupt dispatchers for VIA or RBV machines only. | |
251 | */ | |
252 | ||
253 | void __init via_register_interrupts(void) | |
254 | { | |
255 | if (via_alt_mapping) { | |
9c5f4afd | 256 | request_irq(IRQ_AUTO_1, via1_irq, |
1da177e4 LT |
257 | IRQ_FLG_LOCK|IRQ_FLG_FAST, "software", |
258 | (void *) via1); | |
9c5f4afd | 259 | request_irq(IRQ_AUTO_6, via1_irq, |
1da177e4 LT |
260 | IRQ_FLG_LOCK|IRQ_FLG_FAST, "via1", |
261 | (void *) via1); | |
262 | } else { | |
9c5f4afd | 263 | request_irq(IRQ_AUTO_1, via1_irq, |
1da177e4 LT |
264 | IRQ_FLG_LOCK|IRQ_FLG_FAST, "via1", |
265 | (void *) via1); | |
1da177e4 | 266 | } |
9c5f4afd | 267 | request_irq(IRQ_AUTO_2, via2_irq, IRQ_FLG_LOCK|IRQ_FLG_FAST, |
1da177e4 LT |
268 | "via2", (void *) via2); |
269 | if (!psc_present) { | |
9c5f4afd | 270 | request_irq(IRQ_AUTO_4, mac_scc_dispatch, IRQ_FLG_LOCK, |
1da177e4 LT |
271 | "scc", mac_scc_dispatch); |
272 | } | |
273 | request_irq(IRQ_MAC_NUBUS, via_nubus_irq, IRQ_FLG_LOCK|IRQ_FLG_FAST, | |
274 | "nubus", (void *) via2); | |
275 | } | |
276 | ||
277 | /* | |
278 | * Debugging dump, used in various places to see what's going on. | |
279 | */ | |
280 | ||
281 | void via_debug_dump(void) | |
282 | { | |
283 | printk(KERN_DEBUG "VIA1: DDRA = 0x%02X DDRB = 0x%02X ACR = 0x%02X\n", | |
284 | (uint) via1[vDirA], (uint) via1[vDirB], (uint) via1[vACR]); | |
285 | printk(KERN_DEBUG " PCR = 0x%02X IFR = 0x%02X IER = 0x%02X\n", | |
286 | (uint) via1[vPCR], (uint) via1[vIFR], (uint) via1[vIER]); | |
287 | if (oss_present) { | |
288 | printk(KERN_DEBUG "VIA2: <OSS>\n"); | |
289 | } else if (rbv_present) { | |
290 | printk(KERN_DEBUG "VIA2: IFR = 0x%02X IER = 0x%02X\n", | |
291 | (uint) via2[rIFR], (uint) via2[rIER]); | |
292 | printk(KERN_DEBUG " SIFR = 0x%02X SIER = 0x%02X\n", | |
293 | (uint) via2[rSIFR], (uint) via2[rSIER]); | |
294 | } else { | |
295 | printk(KERN_DEBUG "VIA2: DDRA = 0x%02X DDRB = 0x%02X ACR = 0x%02X\n", | |
296 | (uint) via2[vDirA], (uint) via2[vDirB], | |
297 | (uint) via2[vACR]); | |
298 | printk(KERN_DEBUG " PCR = 0x%02X IFR = 0x%02X IER = 0x%02X\n", | |
299 | (uint) via2[vPCR], | |
300 | (uint) via2[vIFR], (uint) via2[vIER]); | |
301 | } | |
302 | } | |
303 | ||
304 | /* | |
305 | * This is always executed with interrupts disabled. | |
306 | * | |
307 | * TBI: get time offset between scheduling timer ticks | |
308 | */ | |
309 | ||
310 | unsigned long mac_gettimeoffset (void) | |
311 | { | |
312 | unsigned long ticks, offset = 0; | |
313 | ||
314 | /* read VIA1 timer 2 current value */ | |
315 | ticks = via1[vT1CL] | (via1[vT1CH] << 8); | |
316 | /* The probability of underflow is less than 2% */ | |
317 | if (ticks > MAC_CLOCK_TICK - MAC_CLOCK_TICK / 50) | |
318 | /* Check for pending timer interrupt in VIA1 IFR */ | |
319 | if (via1[vIFR] & 0x40) offset = TICK_SIZE; | |
320 | ||
321 | ticks = MAC_CLOCK_TICK - ticks; | |
322 | ticks = ticks * 10000L / MAC_CLOCK_TICK; | |
323 | ||
324 | return ticks + offset; | |
325 | } | |
326 | ||
327 | /* | |
328 | * Flush the L2 cache on Macs that have it by flipping | |
329 | * the system into 24-bit mode for an instant. | |
330 | */ | |
331 | ||
332 | void via_flush_cache(void) | |
333 | { | |
334 | via2[gBufB] &= ~VIA2B_vMode32; | |
335 | via2[gBufB] |= VIA2B_vMode32; | |
336 | } | |
337 | ||
338 | /* | |
339 | * Return the status of the L2 cache on a IIci | |
340 | */ | |
341 | ||
342 | int via_get_cache_disable(void) | |
343 | { | |
344 | /* Safeguard against being called accidentally */ | |
345 | if (!via2) { | |
346 | printk(KERN_ERR "via_get_cache_disable called on a non-VIA machine!\n"); | |
347 | return 1; | |
348 | } | |
349 | ||
350 | return (int) via2[gBufB] & VIA2B_vCDis; | |
351 | } | |
352 | ||
353 | /* | |
354 | * Initialize VIA2 for Nubus access | |
355 | */ | |
356 | ||
357 | void __init via_nubus_init(void) | |
358 | { | |
359 | /* don't set nubus_active = 0 here, it kills the Baboon */ | |
360 | /* interrupt that we've already registered. */ | |
361 | ||
362 | /* unlock nubus transactions */ | |
363 | ||
364 | if (!rbv_present) { | |
365 | /* set the line to be an output on non-RBV machines */ | |
366 | if ((macintosh_config->adb_type != MAC_ADB_PB1) && | |
367 | (macintosh_config->adb_type != MAC_ADB_PB2)) { | |
368 | via2[vDirB] |= 0x02; | |
369 | } | |
370 | } | |
371 | ||
372 | /* this seems to be an ADB bit on PMU machines */ | |
373 | /* according to MkLinux. -- jmt */ | |
374 | ||
375 | if ((macintosh_config->adb_type != MAC_ADB_PB1) && | |
376 | (macintosh_config->adb_type != MAC_ADB_PB2)) { | |
377 | via2[gBufB] |= 0x02; | |
378 | } | |
379 | ||
380 | /* disable nubus slot interrupts. */ | |
381 | if (rbv_present) { | |
382 | via2[rSIER] = 0x7F; | |
383 | via2[rSIER] = nubus_active | 0x80; | |
384 | } else { | |
385 | /* These are ADB bits on PMU */ | |
386 | if ((macintosh_config->adb_type != MAC_ADB_PB1) && | |
387 | (macintosh_config->adb_type != MAC_ADB_PB2)) { | |
388 | switch(macintosh_config->ident) | |
389 | { | |
390 | case MAC_MODEL_II: | |
391 | case MAC_MODEL_IIX: | |
392 | case MAC_MODEL_IICX: | |
393 | case MAC_MODEL_SE30: | |
394 | via2[vBufA] |= 0x3F; | |
395 | via2[vDirA] = ~nubus_active | 0xc0; | |
396 | break; | |
397 | default: | |
398 | via2[vBufA] = 0xFF; | |
399 | via2[vDirA] = ~nubus_active; | |
400 | } | |
401 | } | |
402 | } | |
403 | } | |
404 | ||
405 | /* | |
406 | * The generic VIA interrupt routines (shamelessly stolen from Alan Cox's | |
407 | * via6522.c :-), disable/pending masks added. | |
408 | * | |
409 | * The new interrupt architecture in macints.c takes care of a lot of the | |
410 | * gruntwork for us, including tallying the interrupts and calling the | |
411 | * handlers on the linked list. All we need to do here is basically generate | |
412 | * the machspec interrupt number after clearing the interrupt. | |
413 | */ | |
414 | ||
415 | irqreturn_t via1_irq(int irq, void *dev_id, struct pt_regs *regs) | |
416 | { | |
417 | int irq_bit, i; | |
418 | unsigned char events, mask; | |
419 | ||
420 | mask = via1[vIER] & 0x7F; | |
421 | if (!(events = via1[vIFR] & mask)) | |
422 | return IRQ_NONE; | |
423 | ||
424 | for (i = 0, irq_bit = 1 ; i < 7 ; i++, irq_bit <<= 1) | |
425 | if (events & irq_bit) { | |
426 | via1[vIER] = irq_bit; | |
9c5f4afd | 427 | m68k_handle_int(VIA1_SOURCE_BASE + i, regs); |
1da177e4 LT |
428 | via1[vIFR] = irq_bit; |
429 | via1[vIER] = irq_bit | 0x80; | |
430 | } | |
431 | ||
432 | #if 0 /* freakin' pmu is doing weird stuff */ | |
433 | if (!oss_present) { | |
434 | /* This (still) seems to be necessary to get IDE | |
435 | working. However, if you enable VBL interrupts, | |
436 | you're screwed... */ | |
437 | /* FIXME: should we check the SLOTIRQ bit before | |
438 | pulling this stunt? */ | |
439 | /* No, it won't be set. that's why we're doing this. */ | |
440 | via_irq_disable(IRQ_MAC_NUBUS); | |
441 | via_irq_clear(IRQ_MAC_NUBUS); | |
9c5f4afd | 442 | m68k_handle_int(IRQ_MAC_NUBUS, regs); |
1da177e4 LT |
443 | via_irq_enable(IRQ_MAC_NUBUS); |
444 | } | |
445 | #endif | |
446 | return IRQ_HANDLED; | |
447 | } | |
448 | ||
449 | irqreturn_t via2_irq(int irq, void *dev_id, struct pt_regs *regs) | |
450 | { | |
451 | int irq_bit, i; | |
452 | unsigned char events, mask; | |
453 | ||
454 | mask = via2[gIER] & 0x7F; | |
455 | if (!(events = via2[gIFR] & mask)) | |
456 | return IRQ_NONE; | |
457 | ||
458 | for (i = 0, irq_bit = 1 ; i < 7 ; i++, irq_bit <<= 1) | |
459 | if (events & irq_bit) { | |
460 | via2[gIER] = irq_bit; | |
1da177e4 | 461 | via2[gIFR] = irq_bit | rbv_clear; |
9c5f4afd | 462 | m68k_handle_int(VIA2_SOURCE_BASE + i, regs); |
1da177e4 LT |
463 | via2[gIER] = irq_bit | 0x80; |
464 | } | |
465 | return IRQ_HANDLED; | |
466 | } | |
467 | ||
468 | /* | |
469 | * Dispatch Nubus interrupts. We are called as a secondary dispatch by the | |
470 | * VIA2 dispatcher as a fast interrupt handler. | |
471 | */ | |
472 | ||
473 | irqreturn_t via_nubus_irq(int irq, void *dev_id, struct pt_regs *regs) | |
474 | { | |
475 | int irq_bit, i; | |
476 | unsigned char events; | |
477 | ||
478 | if (!(events = ~via2[gBufA] & nubus_active)) | |
479 | return IRQ_NONE; | |
480 | ||
481 | for (i = 0, irq_bit = 1 ; i < 7 ; i++, irq_bit <<= 1) { | |
482 | if (events & irq_bit) { | |
483 | via_irq_disable(NUBUS_SOURCE_BASE + i); | |
9c5f4afd | 484 | m68k_handle_int(NUBUS_SOURCE_BASE + i, regs); |
1da177e4 LT |
485 | via_irq_enable(NUBUS_SOURCE_BASE + i); |
486 | } | |
487 | } | |
488 | return IRQ_HANDLED; | |
489 | } | |
490 | ||
491 | void via_irq_enable(int irq) { | |
492 | int irq_src = IRQ_SRC(irq); | |
493 | int irq_idx = IRQ_IDX(irq); | |
494 | int irq_bit = 1 << irq_idx; | |
495 | ||
496 | #ifdef DEBUG_IRQUSE | |
497 | printk(KERN_DEBUG "via_irq_enable(%d)\n", irq); | |
498 | #endif | |
499 | ||
500 | if (irq_src == 1) { | |
501 | via1[vIER] = irq_bit | 0x80; | |
502 | } else if (irq_src == 2) { | |
503 | /* | |
504 | * Set vPCR for SCSI interrupts (but not on RBV) | |
505 | */ | |
506 | if ((irq_idx == 0) && !rbv_present) { | |
507 | if (macintosh_config->scsi_type == MAC_SCSI_OLD) { | |
508 | /* CB2 (IRQ) indep. input, positive edge */ | |
509 | /* CA2 (DRQ) indep. input, positive edge */ | |
510 | via2[vPCR] = 0x66; | |
511 | } else { | |
512 | /* CB2 (IRQ) indep. input, negative edge */ | |
513 | /* CA2 (DRQ) indep. input, negative edge */ | |
514 | via2[vPCR] = 0x22; | |
515 | } | |
516 | } | |
517 | via2[gIER] = irq_bit | 0x80; | |
518 | } else if (irq_src == 7) { | |
1a239894 | 519 | nubus_active |= irq_bit; |
1da177e4 LT |
520 | if (rbv_present) { |
521 | /* enable the slot interrupt. SIER works like IER. */ | |
522 | via2[rSIER] = IER_SET_BIT(irq_idx); | |
523 | } else { | |
524 | /* Make sure the bit is an input, to enable the irq */ | |
525 | /* But not on PowerBooks, that's ADB... */ | |
526 | if ((macintosh_config->adb_type != MAC_ADB_PB1) && | |
527 | (macintosh_config->adb_type != MAC_ADB_PB2)) { | |
528 | switch(macintosh_config->ident) | |
529 | { | |
530 | case MAC_MODEL_II: | |
531 | case MAC_MODEL_IIX: | |
532 | case MAC_MODEL_IICX: | |
533 | case MAC_MODEL_SE30: | |
534 | via2[vDirA] &= (~irq_bit | 0xc0); | |
535 | break; | |
536 | default: | |
537 | via2[vDirA] &= ~irq_bit; | |
538 | } | |
539 | } | |
540 | } | |
1da177e4 LT |
541 | } |
542 | } | |
543 | ||
544 | void via_irq_disable(int irq) { | |
545 | int irq_src = IRQ_SRC(irq); | |
546 | int irq_idx = IRQ_IDX(irq); | |
547 | int irq_bit = 1 << irq_idx; | |
548 | ||
549 | #ifdef DEBUG_IRQUSE | |
550 | printk(KERN_DEBUG "via_irq_disable(%d)\n", irq); | |
551 | #endif | |
552 | ||
553 | if (irq_src == 1) { | |
554 | via1[vIER] = irq_bit; | |
555 | } else if (irq_src == 2) { | |
556 | via2[gIER] = irq_bit; | |
557 | } else if (irq_src == 7) { | |
558 | if (rbv_present) { | |
559 | /* disable the slot interrupt. SIER works like IER. */ | |
560 | via2[rSIER] = IER_CLR_BIT(irq_idx); | |
561 | } else { | |
562 | /* disable the nubus irq by changing dir to output */ | |
563 | /* except on PMU */ | |
564 | if ((macintosh_config->adb_type != MAC_ADB_PB1) && | |
565 | (macintosh_config->adb_type != MAC_ADB_PB2)) { | |
566 | via2[vDirA] |= irq_bit; | |
567 | } | |
568 | } | |
569 | nubus_active &= ~irq_bit; | |
570 | } | |
571 | } | |
572 | ||
573 | void via_irq_clear(int irq) { | |
574 | int irq_src = IRQ_SRC(irq); | |
575 | int irq_idx = IRQ_IDX(irq); | |
576 | int irq_bit = 1 << irq_idx; | |
577 | ||
578 | if (irq_src == 1) { | |
579 | via1[vIFR] = irq_bit; | |
580 | } else if (irq_src == 2) { | |
581 | via2[gIFR] = irq_bit | rbv_clear; | |
582 | } else if (irq_src == 7) { | |
583 | /* FIXME: hmm.. */ | |
584 | } | |
585 | } | |
586 | ||
587 | /* | |
588 | * Returns nonzero if an interrupt is pending on the given | |
589 | * VIA/IRQ combination. | |
590 | */ | |
591 | ||
592 | int via_irq_pending(int irq) | |
593 | { | |
594 | int irq_src = IRQ_SRC(irq); | |
595 | int irq_idx = IRQ_IDX(irq); | |
596 | int irq_bit = 1 << irq_idx; | |
597 | ||
598 | if (irq_src == 1) { | |
599 | return via1[vIFR] & irq_bit; | |
600 | } else if (irq_src == 2) { | |
601 | return via2[gIFR] & irq_bit; | |
602 | } else if (irq_src == 7) { | |
603 | return ~via2[gBufA] & irq_bit; | |
604 | } | |
605 | return 0; | |
606 | } |