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26#include <linux/clocksource.h>
27#include <linux/types.h>
28#include <linux/kernel.h>
29#include <linux/mm.h>
30#include <linux/delay.h>
31#include <linux/init.h>
32#include <linux/module.h>
33#include <linux/irq.h>
34
35#include <asm/macintosh.h>
36#include <asm/macints.h>
37#include <asm/mac_via.h>
38#include <asm/mac_psc.h>
39#include <asm/mac_oss.h>
40
41volatile __u8 *via1, *via2;
42int rbv_present;
43int via_alt_mapping;
44EXPORT_SYMBOL(via_alt_mapping);
45static __u8 rbv_clear;
46
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54
55
56static int gIER,gIFR,gBufA,gBufB;
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97
98static u8 nubus_disabled;
99
100void via_debug_dump(void);
101static void via_nubus_init(void);
102
103
104
105
106
107
108
109
110
111void __init via_init(void)
112{
113 via1 = (void *)VIA1_BASE;
114 pr_debug("VIA1 detected at %p\n", via1);
115
116 if (oss_present) {
117 via2 = NULL;
118 rbv_present = 0;
119 } else {
120 switch (macintosh_config->via_type) {
121
122
123
124 case MAC_VIA_IICI:
125 via2 = (void *)RBV_BASE;
126 pr_debug("VIA2 (RBV) detected at %p\n", via2);
127 rbv_present = 1;
128 if (macintosh_config->ident == MAC_MODEL_LCIII) {
129 rbv_clear = 0x00;
130 } else {
131
132
133
134 rbv_clear = 0x80;
135 }
136 gIER = rIER;
137 gIFR = rIFR;
138 gBufA = rSIFR;
139 gBufB = rBufB;
140 break;
141
142
143
144 case MAC_VIA_QUADRA:
145 case MAC_VIA_II:
146 via2 = (void *) VIA2_BASE;
147 pr_debug("VIA2 detected at %p\n", via2);
148 rbv_present = 0;
149 rbv_clear = 0x00;
150 gIER = vIER;
151 gIFR = vIFR;
152 gBufA = vBufA;
153 gBufB = vBufB;
154 break;
155
156 default:
157 panic("UNKNOWN VIA TYPE");
158 }
159 }
160
161#ifdef DEBUG_VIA
162 via_debug_dump();
163#endif
164
165
166
167
168
169
170 via1[vIER] = 0x7F;
171 via1[vIFR] = 0x7F;
172 via1[vT1CL] = 0;
173 via1[vT1CH] = 0;
174 via1[vT2CL] = 0;
175 via1[vT2CH] = 0;
176 via1[vACR] &= ~0xC0;
177 via1[vACR] &= ~0x03;
178
179
180
181
182
183 if (macintosh_config->ident == MAC_MODEL_SE30) {
184 via1[vDirB] |= 0x40;
185 via1[vBufB] |= 0x40;
186 }
187
188 switch (macintosh_config->adb_type) {
189 case MAC_ADB_IOP:
190 case MAC_ADB_II:
191 case MAC_ADB_PB1:
192
193
194
195
196 via1[vDirB] |= VIA1B_vRTCEnb | VIA1B_vRTCClk | VIA1B_vRTCData;
197 via1[vBufB] |= VIA1B_vRTCEnb | VIA1B_vRTCClk;
198 break;
199 }
200
201
202
203 if (oss_present)
204 return;
205
206 if ((macintosh_config->via_type == MAC_VIA_QUADRA) &&
207 (macintosh_config->adb_type != MAC_ADB_PB1) &&
208 (macintosh_config->adb_type != MAC_ADB_PB2) &&
209 (macintosh_config->ident != MAC_MODEL_C660) &&
210 (macintosh_config->ident != MAC_MODEL_Q840)) {
211 via_alt_mapping = 1;
212 via1[vDirB] |= 0x40;
213 via1[vBufB] &= ~0x40;
214 } else {
215 via_alt_mapping = 0;
216 }
217
218
219
220
221
222
223 via2[gIER] = 0x7F;
224 via2[gIFR] = 0x7F | rbv_clear;
225 if (!rbv_present) {
226 via2[vT1CL] = 0;
227 via2[vT1CH] = 0;
228 via2[vT2CL] = 0;
229 via2[vT2CH] = 0;
230 via2[vACR] &= ~0xC0;
231 via2[vACR] &= ~0x03;
232 }
233
234 via_nubus_init();
235
236
237
238 if (rbv_present)
239 return;
240
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249
250
251 pr_debug("VIA2 vPCR is 0x%02X\n", via2[vPCR]);
252 if (macintosh_config->via_type == MAC_VIA_II) {
253
254 via2[vPCR] = 0x66;
255 } else {
256
257 via2[vPCR] = 0x22;
258 }
259}
260
261
262
263
264
265void via_debug_dump(void)
266{
267 printk(KERN_DEBUG "VIA1: DDRA = 0x%02X DDRB = 0x%02X ACR = 0x%02X\n",
268 (uint) via1[vDirA], (uint) via1[vDirB], (uint) via1[vACR]);
269 printk(KERN_DEBUG " PCR = 0x%02X IFR = 0x%02X IER = 0x%02X\n",
270 (uint) via1[vPCR], (uint) via1[vIFR], (uint) via1[vIER]);
271 if (!via2)
272 return;
273 if (rbv_present) {
274 printk(KERN_DEBUG "VIA2: IFR = 0x%02X IER = 0x%02X\n",
275 (uint) via2[rIFR], (uint) via2[rIER]);
276 printk(KERN_DEBUG " SIFR = 0x%02X SIER = 0x%02X\n",
277 (uint) via2[rSIFR], (uint) via2[rSIER]);
278 } else {
279 printk(KERN_DEBUG "VIA2: DDRA = 0x%02X DDRB = 0x%02X ACR = 0x%02X\n",
280 (uint) via2[vDirA], (uint) via2[vDirB],
281 (uint) via2[vACR]);
282 printk(KERN_DEBUG " PCR = 0x%02X IFR = 0x%02X IER = 0x%02X\n",
283 (uint) via2[vPCR],
284 (uint) via2[vIFR], (uint) via2[vIER]);
285 }
286}
287
288
289
290
291
292
293void via_l2_flush(int writeback)
294{
295 unsigned long flags;
296
297 local_irq_save(flags);
298 via2[gBufB] &= ~VIA2B_vMode32;
299 via2[gBufB] |= VIA2B_vMode32;
300 local_irq_restore(flags);
301}
302
303
304
305
306
307static void __init via_nubus_init(void)
308{
309
310
311 if ((macintosh_config->adb_type != MAC_ADB_PB1) &&
312 (macintosh_config->adb_type != MAC_ADB_PB2)) {
313
314 if (!rbv_present)
315 via2[vDirB] |= 0x02;
316
317
318
319 via2[gBufB] |= 0x02;
320 }
321
322
323
324
325
326
327 switch (macintosh_config->via_type) {
328 case MAC_VIA_II:
329 case MAC_VIA_QUADRA:
330 pr_debug("VIA2 vDirA is 0x%02X\n", via2[vDirA]);
331 break;
332 case MAC_VIA_IICI:
333
334 via2[rSIER] = 0x7F;
335 break;
336 }
337}
338
339void via_nubus_irq_startup(int irq)
340{
341 int irq_idx = IRQ_IDX(irq);
342
343 switch (macintosh_config->via_type) {
344 case MAC_VIA_II:
345 case MAC_VIA_QUADRA:
346
347 if (macintosh_config->via_type == MAC_VIA_II) {
348
349 via2[vDirA] &= 0xC0 | ~(1 << irq_idx);
350 } else {
351
352 via2[vDirA] &= 0x80 | ~(1 << irq_idx);
353 }
354 fallthrough;
355 case MAC_VIA_IICI:
356 via_irq_enable(irq);
357 break;
358 }
359}
360
361void via_nubus_irq_shutdown(int irq)
362{
363 switch (macintosh_config->via_type) {
364 case MAC_VIA_II:
365 case MAC_VIA_QUADRA:
366
367 via_irq_enable(irq);
368 break;
369 case MAC_VIA_IICI:
370 via_irq_disable(irq);
371 break;
372 }
373}
374
375
376
377
378
379
380#define VIA_TIMER_1_INT BIT(6)
381
382void via1_irq(struct irq_desc *desc)
383{
384 int irq_num;
385 unsigned char irq_bit, events;
386
387 events = via1[vIFR] & via1[vIER] & 0x7F;
388 if (!events)
389 return;
390
391 irq_num = IRQ_MAC_TIMER_1;
392 irq_bit = VIA_TIMER_1_INT;
393 if (events & irq_bit) {
394 unsigned long flags;
395
396 local_irq_save(flags);
397 via1[vIFR] = irq_bit;
398 generic_handle_irq(irq_num);
399 local_irq_restore(flags);
400
401 events &= ~irq_bit;
402 if (!events)
403 return;
404 }
405
406 irq_num = VIA1_SOURCE_BASE;
407 irq_bit = 1;
408 do {
409 if (events & irq_bit) {
410 via1[vIFR] = irq_bit;
411 generic_handle_irq(irq_num);
412 }
413 ++irq_num;
414 irq_bit <<= 1;
415 } while (events >= irq_bit);
416}
417
418static void via2_irq(struct irq_desc *desc)
419{
420 int irq_num;
421 unsigned char irq_bit, events;
422
423 events = via2[gIFR] & via2[gIER] & 0x7F;
424 if (!events)
425 return;
426
427 irq_num = VIA2_SOURCE_BASE;
428 irq_bit = 1;
429 do {
430 if (events & irq_bit) {
431 via2[gIFR] = irq_bit | rbv_clear;
432 generic_handle_irq(irq_num);
433 }
434 ++irq_num;
435 irq_bit <<= 1;
436 } while (events >= irq_bit);
437}
438
439
440
441
442
443
444static void via_nubus_irq(struct irq_desc *desc)
445{
446 int slot_irq;
447 unsigned char slot_bit, events;
448
449 events = ~via2[gBufA] & 0x7F;
450 if (rbv_present)
451 events &= via2[rSIER];
452 else
453 events &= ~via2[vDirA];
454 if (!events)
455 return;
456
457 do {
458 slot_irq = IRQ_NUBUS_F;
459 slot_bit = 0x40;
460 do {
461 if (events & slot_bit) {
462 events &= ~slot_bit;
463 generic_handle_irq(slot_irq);
464 }
465 --slot_irq;
466 slot_bit >>= 1;
467 } while (events);
468
469
470 via2[gIFR] = 0x02 | rbv_clear;
471 events = ~via2[gBufA] & 0x7F;
472 if (rbv_present)
473 events &= via2[rSIER];
474 else
475 events &= ~via2[vDirA];
476 } while (events);
477}
478
479
480
481
482
483void __init via_register_interrupts(void)
484{
485 if (via_alt_mapping) {
486
487 irq_set_chained_handler(IRQ_AUTO_1, via1_irq);
488
489 irq_set_chained_handler(IRQ_AUTO_6, via1_irq);
490 } else {
491 irq_set_chained_handler(IRQ_AUTO_1, via1_irq);
492 }
493 irq_set_chained_handler(IRQ_AUTO_2, via2_irq);
494 irq_set_chained_handler(IRQ_MAC_NUBUS, via_nubus_irq);
495}
496
497void via_irq_enable(int irq) {
498 int irq_src = IRQ_SRC(irq);
499 int irq_idx = IRQ_IDX(irq);
500
501 if (irq_src == 1) {
502 via1[vIER] = IER_SET_BIT(irq_idx);
503 } else if (irq_src == 2) {
504 if (irq != IRQ_MAC_NUBUS || nubus_disabled == 0)
505 via2[gIER] = IER_SET_BIT(irq_idx);
506 } else if (irq_src == 7) {
507 switch (macintosh_config->via_type) {
508 case MAC_VIA_II:
509 case MAC_VIA_QUADRA:
510 nubus_disabled &= ~(1 << irq_idx);
511
512 if (!nubus_disabled)
513 via2[gIER] = IER_SET_BIT(1);
514 break;
515 case MAC_VIA_IICI:
516
517
518
519 via2[rSIER] = IER_SET_BIT(irq_idx);
520 break;
521 }
522 }
523}
524
525void via_irq_disable(int irq) {
526 int irq_src = IRQ_SRC(irq);
527 int irq_idx = IRQ_IDX(irq);
528
529 if (irq_src == 1) {
530 via1[vIER] = IER_CLR_BIT(irq_idx);
531 } else if (irq_src == 2) {
532 via2[gIER] = IER_CLR_BIT(irq_idx);
533 } else if (irq_src == 7) {
534 switch (macintosh_config->via_type) {
535 case MAC_VIA_II:
536 case MAC_VIA_QUADRA:
537 nubus_disabled |= 1 << irq_idx;
538 if (nubus_disabled)
539 via2[gIER] = IER_CLR_BIT(1);
540 break;
541 case MAC_VIA_IICI:
542 via2[rSIER] = IER_CLR_BIT(irq_idx);
543 break;
544 }
545 }
546}
547
548void via1_set_head(int head)
549{
550 if (head == 0)
551 via1[vBufA] &= ~VIA1A_vHeadSel;
552 else
553 via1[vBufA] |= VIA1A_vHeadSel;
554}
555EXPORT_SYMBOL(via1_set_head);
556
557int via2_scsi_drq_pending(void)
558{
559 return via2[gIFR] & (1 << IRQ_IDX(IRQ_MAC_SCSIDRQ));
560}
561EXPORT_SYMBOL(via2_scsi_drq_pending);
562
563
564
565#define VIA_CLOCK_FREQ 783360
566#define VIA_TIMER_CYCLES (VIA_CLOCK_FREQ / HZ)
567
568#define VIA_TC (VIA_TIMER_CYCLES - 2)
569#define VIA_TC_LOW (VIA_TC & 0xFF)
570#define VIA_TC_HIGH (VIA_TC >> 8)
571
572static u64 mac_read_clk(struct clocksource *cs);
573
574static struct clocksource mac_clk = {
575 .name = "via1",
576 .rating = 250,
577 .read = mac_read_clk,
578 .mask = CLOCKSOURCE_MASK(32),
579 .flags = CLOCK_SOURCE_IS_CONTINUOUS,
580};
581
582static u32 clk_total, clk_offset;
583
584static irqreturn_t via_timer_handler(int irq, void *dev_id)
585{
586 clk_total += VIA_TIMER_CYCLES;
587 clk_offset = 0;
588 legacy_timer_tick(1);
589
590 return IRQ_HANDLED;
591}
592
593void __init via_init_clock(void)
594{
595 if (request_irq(IRQ_MAC_TIMER_1, via_timer_handler, IRQF_TIMER, "timer",
596 NULL)) {
597 pr_err("Couldn't register %s interrupt\n", "timer");
598 return;
599 }
600
601 via1[vT1CL] = VIA_TC_LOW;
602 via1[vT1CH] = VIA_TC_HIGH;
603 via1[vACR] |= 0x40;
604
605 clocksource_register_hz(&mac_clk, VIA_CLOCK_FREQ);
606}
607
608static u64 mac_read_clk(struct clocksource *cs)
609{
610 unsigned long flags;
611 u8 count_high;
612 u16 count;
613 u32 ticks;
614
615
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619
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621
622
623
624 local_irq_save(flags);
625 count_high = via1[vT1CH];
626 if (count_high == 0xFF)
627 count_high = 0;
628 if (count_high > 0 && (via1[vIFR] & VIA_TIMER_1_INT))
629 clk_offset = VIA_TIMER_CYCLES;
630 count = count_high << 8;
631 ticks = VIA_TIMER_CYCLES - count;
632 ticks += clk_offset + clk_total;
633 local_irq_restore(flags);
634
635 return ticks;
636}
637