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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); | |
2850bc27 AV |
66 | irqreturn_t via1_irq(int, void *); |
67 | irqreturn_t via2_irq(int, void *); | |
68 | irqreturn_t via_nubus_irq(int, void *); | |
1da177e4 LT |
69 | void via_irq_enable(int irq); |
70 | void via_irq_disable(int irq); | |
71 | void via_irq_clear(int irq); | |
72 | ||
2850bc27 | 73 | extern irqreturn_t mac_scc_dispatch(int, void *); |
1da177e4 LT |
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) { | |
e10e5c43 FT |
196 | case MAC_MODEL_P475: |
197 | case MAC_MODEL_P475F: | |
198 | case MAC_MODEL_P575: | |
199 | case MAC_MODEL_Q605: | |
200 | case MAC_MODEL_Q605_ACC: | |
1da177e4 LT |
201 | case MAC_MODEL_C610: |
202 | case MAC_MODEL_Q610: | |
e10e5c43 | 203 | case MAC_MODEL_Q630: |
1da177e4 LT |
204 | case MAC_MODEL_C650: |
205 | case MAC_MODEL_Q650: | |
206 | case MAC_MODEL_Q700: | |
207 | case MAC_MODEL_Q800: | |
208 | case MAC_MODEL_Q900: | |
209 | case MAC_MODEL_Q950: | |
210 | via_alt_mapping = 1; | |
211 | via1[vDirB] |= 0x40; | |
212 | via1[vBufB] &= ~0x40; | |
213 | break; | |
214 | default: | |
215 | via_alt_mapping = 0; | |
216 | break; | |
217 | } | |
218 | #else | |
1da177e4 LT |
219 | via_alt_mapping = 0; |
220 | #endif | |
221 | ||
222 | /* | |
223 | * Now initialize VIA2. For RBV we just kill all interrupts; | |
224 | * for a regular VIA we also reset the timers and stuff. | |
225 | */ | |
226 | ||
227 | via2[gIER] = 0x7F; | |
228 | via2[gIFR] = 0x7F | rbv_clear; | |
229 | if (!rbv_present) { | |
230 | via2[vT1LL] = 0; | |
231 | via2[vT1LH] = 0; | |
232 | via2[vT1CL] = 0; | |
233 | via2[vT1CH] = 0; | |
234 | via2[vT2CL] = 0; | |
235 | via2[vT2CH] = 0; | |
236 | via2[vACR] &= 0x3F; | |
237 | } | |
238 | } | |
239 | ||
240 | /* | |
241 | * Start the 100 Hz clock | |
242 | */ | |
243 | ||
40220c1a | 244 | void __init via_init_clock(irq_handler_t func) |
1da177e4 LT |
245 | { |
246 | via1[vACR] |= 0x40; | |
247 | via1[vT1LL] = MAC_CLOCK_LOW; | |
248 | via1[vT1LH] = MAC_CLOCK_HIGH; | |
249 | via1[vT1CL] = MAC_CLOCK_LOW; | |
250 | via1[vT1CH] = MAC_CLOCK_HIGH; | |
251 | ||
252 | request_irq(IRQ_MAC_TIMER_1, func, IRQ_FLG_LOCK, "timer", func); | |
253 | } | |
254 | ||
255 | /* | |
256 | * Register the interrupt dispatchers for VIA or RBV machines only. | |
257 | */ | |
258 | ||
259 | void __init via_register_interrupts(void) | |
260 | { | |
261 | if (via_alt_mapping) { | |
9c5f4afd | 262 | request_irq(IRQ_AUTO_1, via1_irq, |
1da177e4 LT |
263 | IRQ_FLG_LOCK|IRQ_FLG_FAST, "software", |
264 | (void *) via1); | |
9c5f4afd | 265 | request_irq(IRQ_AUTO_6, via1_irq, |
1da177e4 LT |
266 | IRQ_FLG_LOCK|IRQ_FLG_FAST, "via1", |
267 | (void *) via1); | |
268 | } else { | |
9c5f4afd | 269 | request_irq(IRQ_AUTO_1, via1_irq, |
1da177e4 LT |
270 | IRQ_FLG_LOCK|IRQ_FLG_FAST, "via1", |
271 | (void *) via1); | |
1da177e4 | 272 | } |
9c5f4afd | 273 | request_irq(IRQ_AUTO_2, via2_irq, IRQ_FLG_LOCK|IRQ_FLG_FAST, |
1da177e4 LT |
274 | "via2", (void *) via2); |
275 | if (!psc_present) { | |
9c5f4afd | 276 | request_irq(IRQ_AUTO_4, mac_scc_dispatch, IRQ_FLG_LOCK, |
1da177e4 LT |
277 | "scc", mac_scc_dispatch); |
278 | } | |
279 | request_irq(IRQ_MAC_NUBUS, via_nubus_irq, IRQ_FLG_LOCK|IRQ_FLG_FAST, | |
280 | "nubus", (void *) via2); | |
281 | } | |
282 | ||
283 | /* | |
284 | * Debugging dump, used in various places to see what's going on. | |
285 | */ | |
286 | ||
287 | void via_debug_dump(void) | |
288 | { | |
289 | printk(KERN_DEBUG "VIA1: DDRA = 0x%02X DDRB = 0x%02X ACR = 0x%02X\n", | |
290 | (uint) via1[vDirA], (uint) via1[vDirB], (uint) via1[vACR]); | |
291 | printk(KERN_DEBUG " PCR = 0x%02X IFR = 0x%02X IER = 0x%02X\n", | |
292 | (uint) via1[vPCR], (uint) via1[vIFR], (uint) via1[vIER]); | |
293 | if (oss_present) { | |
294 | printk(KERN_DEBUG "VIA2: <OSS>\n"); | |
295 | } else if (rbv_present) { | |
296 | printk(KERN_DEBUG "VIA2: IFR = 0x%02X IER = 0x%02X\n", | |
297 | (uint) via2[rIFR], (uint) via2[rIER]); | |
298 | printk(KERN_DEBUG " SIFR = 0x%02X SIER = 0x%02X\n", | |
299 | (uint) via2[rSIFR], (uint) via2[rSIER]); | |
300 | } else { | |
301 | printk(KERN_DEBUG "VIA2: DDRA = 0x%02X DDRB = 0x%02X ACR = 0x%02X\n", | |
302 | (uint) via2[vDirA], (uint) via2[vDirB], | |
303 | (uint) via2[vACR]); | |
304 | printk(KERN_DEBUG " PCR = 0x%02X IFR = 0x%02X IER = 0x%02X\n", | |
305 | (uint) via2[vPCR], | |
306 | (uint) via2[vIFR], (uint) via2[vIER]); | |
307 | } | |
308 | } | |
309 | ||
310 | /* | |
311 | * This is always executed with interrupts disabled. | |
312 | * | |
313 | * TBI: get time offset between scheduling timer ticks | |
314 | */ | |
315 | ||
316 | unsigned long mac_gettimeoffset (void) | |
317 | { | |
318 | unsigned long ticks, offset = 0; | |
319 | ||
320 | /* read VIA1 timer 2 current value */ | |
321 | ticks = via1[vT1CL] | (via1[vT1CH] << 8); | |
322 | /* The probability of underflow is less than 2% */ | |
323 | if (ticks > MAC_CLOCK_TICK - MAC_CLOCK_TICK / 50) | |
324 | /* Check for pending timer interrupt in VIA1 IFR */ | |
325 | if (via1[vIFR] & 0x40) offset = TICK_SIZE; | |
326 | ||
327 | ticks = MAC_CLOCK_TICK - ticks; | |
328 | ticks = ticks * 10000L / MAC_CLOCK_TICK; | |
329 | ||
330 | return ticks + offset; | |
331 | } | |
332 | ||
333 | /* | |
334 | * Flush the L2 cache on Macs that have it by flipping | |
335 | * the system into 24-bit mode for an instant. | |
336 | */ | |
337 | ||
338 | void via_flush_cache(void) | |
339 | { | |
340 | via2[gBufB] &= ~VIA2B_vMode32; | |
341 | via2[gBufB] |= VIA2B_vMode32; | |
342 | } | |
343 | ||
344 | /* | |
345 | * Return the status of the L2 cache on a IIci | |
346 | */ | |
347 | ||
348 | int via_get_cache_disable(void) | |
349 | { | |
350 | /* Safeguard against being called accidentally */ | |
351 | if (!via2) { | |
352 | printk(KERN_ERR "via_get_cache_disable called on a non-VIA machine!\n"); | |
353 | return 1; | |
354 | } | |
355 | ||
356 | return (int) via2[gBufB] & VIA2B_vCDis; | |
357 | } | |
358 | ||
359 | /* | |
360 | * Initialize VIA2 for Nubus access | |
361 | */ | |
362 | ||
363 | void __init via_nubus_init(void) | |
364 | { | |
365 | /* don't set nubus_active = 0 here, it kills the Baboon */ | |
366 | /* interrupt that we've already registered. */ | |
367 | ||
368 | /* unlock nubus transactions */ | |
369 | ||
370 | if (!rbv_present) { | |
371 | /* set the line to be an output on non-RBV machines */ | |
372 | if ((macintosh_config->adb_type != MAC_ADB_PB1) && | |
373 | (macintosh_config->adb_type != MAC_ADB_PB2)) { | |
374 | via2[vDirB] |= 0x02; | |
375 | } | |
376 | } | |
377 | ||
378 | /* this seems to be an ADB bit on PMU machines */ | |
379 | /* according to MkLinux. -- jmt */ | |
380 | ||
381 | if ((macintosh_config->adb_type != MAC_ADB_PB1) && | |
382 | (macintosh_config->adb_type != MAC_ADB_PB2)) { | |
383 | via2[gBufB] |= 0x02; | |
384 | } | |
385 | ||
386 | /* disable nubus slot interrupts. */ | |
387 | if (rbv_present) { | |
388 | via2[rSIER] = 0x7F; | |
389 | via2[rSIER] = nubus_active | 0x80; | |
390 | } else { | |
391 | /* These are ADB bits on PMU */ | |
392 | if ((macintosh_config->adb_type != MAC_ADB_PB1) && | |
393 | (macintosh_config->adb_type != MAC_ADB_PB2)) { | |
394 | switch(macintosh_config->ident) | |
395 | { | |
396 | case MAC_MODEL_II: | |
397 | case MAC_MODEL_IIX: | |
398 | case MAC_MODEL_IICX: | |
399 | case MAC_MODEL_SE30: | |
400 | via2[vBufA] |= 0x3F; | |
401 | via2[vDirA] = ~nubus_active | 0xc0; | |
402 | break; | |
403 | default: | |
404 | via2[vBufA] = 0xFF; | |
405 | via2[vDirA] = ~nubus_active; | |
406 | } | |
407 | } | |
408 | } | |
409 | } | |
410 | ||
411 | /* | |
412 | * The generic VIA interrupt routines (shamelessly stolen from Alan Cox's | |
413 | * via6522.c :-), disable/pending masks added. | |
414 | * | |
415 | * The new interrupt architecture in macints.c takes care of a lot of the | |
416 | * gruntwork for us, including tallying the interrupts and calling the | |
417 | * handlers on the linked list. All we need to do here is basically generate | |
418 | * the machspec interrupt number after clearing the interrupt. | |
419 | */ | |
420 | ||
2850bc27 | 421 | irqreturn_t via1_irq(int irq, void *dev_id) |
1da177e4 LT |
422 | { |
423 | int irq_bit, i; | |
424 | unsigned char events, mask; | |
425 | ||
426 | mask = via1[vIER] & 0x7F; | |
427 | if (!(events = via1[vIFR] & mask)) | |
428 | return IRQ_NONE; | |
429 | ||
430 | for (i = 0, irq_bit = 1 ; i < 7 ; i++, irq_bit <<= 1) | |
431 | if (events & irq_bit) { | |
432 | via1[vIER] = irq_bit; | |
1da177e4 | 433 | via1[vIFR] = irq_bit; |
647b804c | 434 | m68k_handle_int(VIA1_SOURCE_BASE + i); |
1da177e4 LT |
435 | via1[vIER] = irq_bit | 0x80; |
436 | } | |
437 | ||
438 | #if 0 /* freakin' pmu is doing weird stuff */ | |
439 | if (!oss_present) { | |
440 | /* This (still) seems to be necessary to get IDE | |
441 | working. However, if you enable VBL interrupts, | |
442 | you're screwed... */ | |
443 | /* FIXME: should we check the SLOTIRQ bit before | |
444 | pulling this stunt? */ | |
445 | /* No, it won't be set. that's why we're doing this. */ | |
446 | via_irq_disable(IRQ_MAC_NUBUS); | |
447 | via_irq_clear(IRQ_MAC_NUBUS); | |
2850bc27 | 448 | m68k_handle_int(IRQ_MAC_NUBUS); |
1da177e4 LT |
449 | via_irq_enable(IRQ_MAC_NUBUS); |
450 | } | |
451 | #endif | |
452 | return IRQ_HANDLED; | |
453 | } | |
454 | ||
2850bc27 | 455 | irqreturn_t via2_irq(int irq, void *dev_id) |
1da177e4 LT |
456 | { |
457 | int irq_bit, i; | |
458 | unsigned char events, mask; | |
459 | ||
460 | mask = via2[gIER] & 0x7F; | |
461 | if (!(events = via2[gIFR] & mask)) | |
462 | return IRQ_NONE; | |
463 | ||
464 | for (i = 0, irq_bit = 1 ; i < 7 ; i++, irq_bit <<= 1) | |
465 | if (events & irq_bit) { | |
466 | via2[gIER] = irq_bit; | |
1da177e4 | 467 | via2[gIFR] = irq_bit | rbv_clear; |
2850bc27 | 468 | m68k_handle_int(VIA2_SOURCE_BASE + i); |
1da177e4 LT |
469 | via2[gIER] = irq_bit | 0x80; |
470 | } | |
471 | return IRQ_HANDLED; | |
472 | } | |
473 | ||
474 | /* | |
475 | * Dispatch Nubus interrupts. We are called as a secondary dispatch by the | |
476 | * VIA2 dispatcher as a fast interrupt handler. | |
477 | */ | |
478 | ||
2850bc27 | 479 | irqreturn_t via_nubus_irq(int irq, void *dev_id) |
1da177e4 LT |
480 | { |
481 | int irq_bit, i; | |
482 | unsigned char events; | |
483 | ||
484 | if (!(events = ~via2[gBufA] & nubus_active)) | |
485 | return IRQ_NONE; | |
486 | ||
487 | for (i = 0, irq_bit = 1 ; i < 7 ; i++, irq_bit <<= 1) { | |
488 | if (events & irq_bit) { | |
489 | via_irq_disable(NUBUS_SOURCE_BASE + i); | |
2850bc27 | 490 | m68k_handle_int(NUBUS_SOURCE_BASE + i); |
1da177e4 LT |
491 | via_irq_enable(NUBUS_SOURCE_BASE + i); |
492 | } | |
493 | } | |
494 | return IRQ_HANDLED; | |
495 | } | |
496 | ||
497 | void via_irq_enable(int irq) { | |
498 | int irq_src = IRQ_SRC(irq); | |
499 | int irq_idx = IRQ_IDX(irq); | |
500 | int irq_bit = 1 << irq_idx; | |
501 | ||
502 | #ifdef DEBUG_IRQUSE | |
503 | printk(KERN_DEBUG "via_irq_enable(%d)\n", irq); | |
504 | #endif | |
505 | ||
506 | if (irq_src == 1) { | |
507 | via1[vIER] = irq_bit | 0x80; | |
508 | } else if (irq_src == 2) { | |
509 | /* | |
510 | * Set vPCR for SCSI interrupts (but not on RBV) | |
511 | */ | |
512 | if ((irq_idx == 0) && !rbv_present) { | |
513 | if (macintosh_config->scsi_type == MAC_SCSI_OLD) { | |
514 | /* CB2 (IRQ) indep. input, positive edge */ | |
515 | /* CA2 (DRQ) indep. input, positive edge */ | |
516 | via2[vPCR] = 0x66; | |
517 | } else { | |
518 | /* CB2 (IRQ) indep. input, negative edge */ | |
519 | /* CA2 (DRQ) indep. input, negative edge */ | |
520 | via2[vPCR] = 0x22; | |
521 | } | |
522 | } | |
523 | via2[gIER] = irq_bit | 0x80; | |
524 | } else if (irq_src == 7) { | |
1a239894 | 525 | nubus_active |= irq_bit; |
1da177e4 LT |
526 | if (rbv_present) { |
527 | /* enable the slot interrupt. SIER works like IER. */ | |
528 | via2[rSIER] = IER_SET_BIT(irq_idx); | |
529 | } else { | |
530 | /* Make sure the bit is an input, to enable the irq */ | |
531 | /* But not on PowerBooks, that's ADB... */ | |
532 | if ((macintosh_config->adb_type != MAC_ADB_PB1) && | |
533 | (macintosh_config->adb_type != MAC_ADB_PB2)) { | |
534 | switch(macintosh_config->ident) | |
535 | { | |
536 | case MAC_MODEL_II: | |
537 | case MAC_MODEL_IIX: | |
538 | case MAC_MODEL_IICX: | |
539 | case MAC_MODEL_SE30: | |
540 | via2[vDirA] &= (~irq_bit | 0xc0); | |
541 | break; | |
542 | default: | |
543 | via2[vDirA] &= ~irq_bit; | |
544 | } | |
545 | } | |
546 | } | |
1da177e4 LT |
547 | } |
548 | } | |
549 | ||
550 | void via_irq_disable(int irq) { | |
551 | int irq_src = IRQ_SRC(irq); | |
552 | int irq_idx = IRQ_IDX(irq); | |
553 | int irq_bit = 1 << irq_idx; | |
554 | ||
555 | #ifdef DEBUG_IRQUSE | |
556 | printk(KERN_DEBUG "via_irq_disable(%d)\n", irq); | |
557 | #endif | |
558 | ||
559 | if (irq_src == 1) { | |
560 | via1[vIER] = irq_bit; | |
561 | } else if (irq_src == 2) { | |
562 | via2[gIER] = irq_bit; | |
563 | } else if (irq_src == 7) { | |
564 | if (rbv_present) { | |
565 | /* disable the slot interrupt. SIER works like IER. */ | |
566 | via2[rSIER] = IER_CLR_BIT(irq_idx); | |
567 | } else { | |
568 | /* disable the nubus irq by changing dir to output */ | |
569 | /* except on PMU */ | |
570 | if ((macintosh_config->adb_type != MAC_ADB_PB1) && | |
571 | (macintosh_config->adb_type != MAC_ADB_PB2)) { | |
572 | via2[vDirA] |= irq_bit; | |
573 | } | |
574 | } | |
575 | nubus_active &= ~irq_bit; | |
576 | } | |
577 | } | |
578 | ||
579 | void via_irq_clear(int irq) { | |
580 | int irq_src = IRQ_SRC(irq); | |
581 | int irq_idx = IRQ_IDX(irq); | |
582 | int irq_bit = 1 << irq_idx; | |
583 | ||
584 | if (irq_src == 1) { | |
585 | via1[vIFR] = irq_bit; | |
586 | } else if (irq_src == 2) { | |
587 | via2[gIFR] = irq_bit | rbv_clear; | |
588 | } else if (irq_src == 7) { | |
589 | /* FIXME: hmm.. */ | |
590 | } | |
591 | } | |
592 | ||
593 | /* | |
594 | * Returns nonzero if an interrupt is pending on the given | |
595 | * VIA/IRQ combination. | |
596 | */ | |
597 | ||
598 | int via_irq_pending(int irq) | |
599 | { | |
600 | int irq_src = IRQ_SRC(irq); | |
601 | int irq_idx = IRQ_IDX(irq); | |
602 | int irq_bit = 1 << irq_idx; | |
603 | ||
604 | if (irq_src == 1) { | |
605 | return via1[vIFR] & irq_bit; | |
606 | } else if (irq_src == 2) { | |
607 | return via2[gIFR] & irq_bit; | |
608 | } else if (irq_src == 7) { | |
609 | return ~via2[gBufA] & irq_bit; | |
610 | } | |
611 | return 0; | |
612 | } |