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TOMOYO Linux Cross Reference
Linux/arch/m68k/mac/via.c

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  1 /*
  2  *      6522 Versatile Interface Adapter (VIA)
  3  *
  4  *      There are two of these on the Mac II. Some IRQs 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  * Additional data is here (the SY6522 was used in the Mac II etc):
 17  *     http://www.6502.org/documents/datasheets/synertek/synertek_sy6522.pdf
 18  *     http://www.6502.org/documents/datasheets/synertek/synertek_sy6522_programming_reference.pdf
 19  *
 20  * PRAM/RTC access algorithms are from the NetBSD RTC toolkit version 1.08b
 21  * by Erik Vogan and adapted to Linux by Joshua M. Thompson (funaho@jurai.org)
 22  *
 23  */
 24 
 25 #include <linux/types.h>
 26 #include <linux/kernel.h>
 27 #include <linux/mm.h>
 28 #include <linux/delay.h>
 29 #include <linux/init.h>
 30 #include <linux/module.h>
 31 
 32 #include <asm/bootinfo.h>
 33 #include <asm/macintosh.h>
 34 #include <asm/macints.h>
 35 #include <asm/mac_via.h>
 36 #include <asm/mac_psc.h>
 37 #include <asm/mac_oss.h>
 38 
 39 volatile __u8 *via1, *via2;
 40 int rbv_present;
 41 int via_alt_mapping;
 42 EXPORT_SYMBOL(via_alt_mapping);
 43 static __u8 rbv_clear;
 44 
 45 /*
 46  * Globals for accessing the VIA chip registers without having to
 47  * check if we're hitting a real VIA or an RBV. Normally you could
 48  * just hit the combined register (ie, vIER|rIER) but that seems to
 49  * break on AV Macs...probably because they actually decode more than
 50  * eight address bits. Why can't Apple engineers at least be
 51  * _consistently_ lazy?                          - 1999-05-21 (jmt)
 52  */
 53 
 54 static int gIER,gIFR,gBufA,gBufB;
 55 
 56 /*
 57  * Timer defs.
 58  */
 59 
 60 #define TICK_SIZE               10000
 61 #define MAC_CLOCK_TICK          (783300/HZ)             /* ticks per HZ */
 62 #define MAC_CLOCK_LOW           (MAC_CLOCK_TICK&0xFF)
 63 #define MAC_CLOCK_HIGH          (MAC_CLOCK_TICK>>8)
 64 
 65 /* To disable a NuBus slot on Quadras we make that slot IRQ line an output set
 66  * high. On RBV we just use the slot interrupt enable register. On Macs with
 67  * genuine VIA chips we must use nubus_disabled to keep track of disabled slot
 68  * interrupts. When any slot IRQ is disabled we mask the (edge triggered) CA1
 69  * or "SLOTS" interrupt. When no slot is disabled, we unmask the CA1 interrupt.
 70  * So, on genuine VIAs, having more than one NuBus IRQ can mean trouble,
 71  * because closing one of those drivers can mask all of the NuBus interrupts.
 72  * Also, since we can't mask the unregistered slot IRQs on genuine VIAs, it's
 73  * possible to get interrupts from cards that MacOS or the ROM has configured
 74  * but we have not. FWIW, "Designing Cards and Drivers for Macintosh II and
 75  * Macintosh SE", page 9-8, says, a slot IRQ with no driver would crash MacOS.
 76  */
 77 static u8 nubus_disabled;
 78 
 79 void via_debug_dump(void);
 80 irqreturn_t via1_irq(int, void *);
 81 irqreturn_t via2_irq(int, void *);
 82 irqreturn_t via_nubus_irq(int, void *);
 83 void via_irq_enable(int irq);
 84 void via_irq_disable(int irq);
 85 void via_irq_clear(int irq);
 86 
 87 /*
 88  * Initialize the VIAs
 89  *
 90  * First we figure out where they actually _are_ as well as what type of
 91  * VIA we have for VIA2 (it could be a real VIA or an RBV or even an OSS.)
 92  * Then we pretty much clear them out and disable all IRQ sources.
 93  *
 94  * Note: the OSS is actually "detected" here and not in oss_init(). It just
 95  *       seems more logical to do it here since via_init() needs to know
 96  *       these things anyways.
 97  */
 98 
 99 void __init via_init(void)
100 {
101         switch(macintosh_config->via_type) {
102 
103                 /* IIci, IIsi, IIvx, IIvi (P6xx), LC series */
104 
105                 case MAC_VIA_IIci:
106                         via1 = (void *) VIA1_BASE;
107                         if (macintosh_config->ident == MAC_MODEL_IIFX) {
108                                 via2 = NULL;
109                                 rbv_present = 0;
110                                 oss_present = 1;
111                         } else {
112                                 via2 = (void *) RBV_BASE;
113                                 rbv_present = 1;
114                                 oss_present = 0;
115                         }
116                         if (macintosh_config->ident == MAC_MODEL_LCIII) {
117                                 rbv_clear = 0x00;
118                         } else {
119                                 /* on most RBVs (& unlike the VIAs), you   */
120                                 /* need to set bit 7 when you write to IFR */
121                                 /* in order for your clear to occur.       */
122                                 rbv_clear = 0x80;
123                         }
124                         gIER = rIER;
125                         gIFR = rIFR;
126                         gBufA = rSIFR;
127                         gBufB = rBufB;
128                         break;
129 
130                 /* Quadra and early MacIIs agree on the VIA locations */
131 
132                 case MAC_VIA_QUADRA:
133                 case MAC_VIA_II:
134                         via1 = (void *) VIA1_BASE;
135                         via2 = (void *) VIA2_BASE;
136                         rbv_present = 0;
137                         oss_present = 0;
138                         rbv_clear = 0x00;
139                         gIER = vIER;
140                         gIFR = vIFR;
141                         gBufA = vBufA;
142                         gBufB = vBufB;
143                         break;
144                 default:
145                         panic("UNKNOWN VIA TYPE");
146         }
147 
148         printk(KERN_INFO "VIA1 at %p is a 6522 or clone\n", via1);
149 
150         printk(KERN_INFO "VIA2 at %p is ", via2);
151         if (rbv_present) {
152                 printk("an RBV\n");
153         } else if (oss_present) {
154                 printk("an OSS\n");
155         } else {
156                 printk("a 6522 or clone\n");
157         }
158 
159 #ifdef DEBUG_VIA
160         via_debug_dump();
161 #endif
162 
163         /*
164          * Shut down all IRQ sources, reset the timers, and
165          * kill the timer latch on VIA1.
166          */
167 
168         via1[vIER] = 0x7F;
169         via1[vIFR] = 0x7F;
170         via1[vT1LL] = 0;
171         via1[vT1LH] = 0;
172         via1[vT1CL] = 0;
173         via1[vT1CH] = 0;
174         via1[vT2CL] = 0;
175         via1[vT2CH] = 0;
176         via1[vACR] &= ~0xC0; /* setup T1 timer with no PB7 output */
177         via1[vACR] &= ~0x03; /* disable port A & B latches */
178 
179         /*
180          * SE/30: disable video IRQ
181          * XXX: testing for SE/30 VBL
182          */
183 
184         if (macintosh_config->ident == MAC_MODEL_SE30) {
185                 via1[vDirB] |= 0x40;
186                 via1[vBufB] |= 0x40;
187         }
188 
189         /*
190          * Set the RTC bits to a known state: all lines to outputs and
191          * RTC disabled (yes that's 0 to enable and 1 to disable).
192          */
193 
194         via1[vDirB] |= (VIA1B_vRTCEnb | VIA1B_vRTCClk | VIA1B_vRTCData);
195         via1[vBufB] |= (VIA1B_vRTCEnb | VIA1B_vRTCClk);
196 
197         /* Everything below this point is VIA2/RBV only... */
198 
199         if (oss_present)
200                 return;
201 
202         /* Some machines support an alternate IRQ mapping that spreads  */
203         /* Ethernet and Sound out to their own autolevel IRQs and moves */
204         /* VIA1 to level 6. A/UX uses this mapping and we do too.  Note */
205         /* that the IIfx emulates this alternate mapping using the OSS. */
206 
207         via_alt_mapping = 0;
208         if (macintosh_config->via_type == MAC_VIA_QUADRA)
209                 switch (macintosh_config->ident) {
210                 case MAC_MODEL_C660:
211                 case MAC_MODEL_Q840:
212                         /* not applicable */
213                         break;
214                 case MAC_MODEL_P588:
215                 case MAC_MODEL_TV:
216                 case MAC_MODEL_PB140:
217                 case MAC_MODEL_PB145:
218                 case MAC_MODEL_PB160:
219                 case MAC_MODEL_PB165:
220                 case MAC_MODEL_PB165C:
221                 case MAC_MODEL_PB170:
222                 case MAC_MODEL_PB180:
223                 case MAC_MODEL_PB180C:
224                 case MAC_MODEL_PB190:
225                 case MAC_MODEL_PB520:
226                         /* not yet tested */
227                         break;
228                 default:
229                         via_alt_mapping = 1;
230                         via1[vDirB] |= 0x40;
231                         via1[vBufB] &= ~0x40;
232                         break;
233                 }
234 
235         /*
236          * Now initialize VIA2. For RBV we just kill all interrupts;
237          * for a regular VIA we also reset the timers and stuff.
238          */
239 
240         via2[gIER] = 0x7F;
241         via2[gIFR] = 0x7F | rbv_clear;
242         if (!rbv_present) {
243                 via2[vT1LL] = 0;
244                 via2[vT1LH] = 0;
245                 via2[vT1CL] = 0;
246                 via2[vT1CH] = 0;
247                 via2[vT2CL] = 0;
248                 via2[vT2CH] = 0;
249                 via2[vACR] &= ~0xC0; /* setup T1 timer with no PB7 output */
250                 via2[vACR] &= ~0x03; /* disable port A & B latches */
251         }
252 
253         /*
254          * Set vPCR for control line interrupts (but not on RBV)
255          */
256         if (!rbv_present) {
257                 /* For all VIA types, CA1 (SLOTS IRQ) and CB1 (ASC IRQ)
258                  * are made negative edge triggered here.
259                  */
260                 if (macintosh_config->scsi_type == MAC_SCSI_OLD) {
261                         /* CB2 (IRQ) indep. input, positive edge */
262                         /* CA2 (DRQ) indep. input, positive edge */
263                         via2[vPCR] = 0x66;
264                 } else {
265                         /* CB2 (IRQ) indep. input, negative edge */
266                         /* CA2 (DRQ) indep. input, negative edge */
267                         via2[vPCR] = 0x22;
268                 }
269         }
270 }
271 
272 /*
273  * Start the 100 Hz clock
274  */
275 
276 void __init via_init_clock(irq_handler_t func)
277 {
278         via1[vACR] |= 0x40;
279         via1[vT1LL] = MAC_CLOCK_LOW;
280         via1[vT1LH] = MAC_CLOCK_HIGH;
281         via1[vT1CL] = MAC_CLOCK_LOW;
282         via1[vT1CH] = MAC_CLOCK_HIGH;
283 
284         if (request_irq(IRQ_MAC_TIMER_1, func, IRQ_FLG_LOCK, "timer", func))
285                 pr_err("Couldn't register %s interrupt\n", "timer");
286 }
287 
288 /*
289  * Register the interrupt dispatchers for VIA or RBV machines only.
290  */
291 
292 void __init via_register_interrupts(void)
293 {
294         if (via_alt_mapping) {
295                 if (request_irq(IRQ_AUTO_1, via1_irq,
296                                 IRQ_FLG_LOCK|IRQ_FLG_FAST, "software",
297                                 (void *) via1))
298                         pr_err("Couldn't register %s interrupt\n", "software");
299                 if (request_irq(IRQ_AUTO_6, via1_irq,
300                                 IRQ_FLG_LOCK|IRQ_FLG_FAST, "via1",
301                                 (void *) via1))
302                         pr_err("Couldn't register %s interrupt\n", "via1");
303         } else {
304                 if (request_irq(IRQ_AUTO_1, via1_irq,
305                                 IRQ_FLG_LOCK|IRQ_FLG_FAST, "via1",
306                                 (void *) via1))
307                         pr_err("Couldn't register %s interrupt\n", "via1");
308         }
309         if (request_irq(IRQ_AUTO_2, via2_irq, IRQ_FLG_LOCK|IRQ_FLG_FAST,
310                         "via2", (void *) via2))
311                 pr_err("Couldn't register %s interrupt\n", "via2");
312         if (request_irq(IRQ_MAC_NUBUS, via_nubus_irq,
313                         IRQ_FLG_LOCK|IRQ_FLG_FAST, "nubus", (void *) via2))
314                 pr_err("Couldn't register %s interrupt\n", "nubus");
315 }
316 
317 /*
318  * Debugging dump, used in various places to see what's going on.
319  */
320 
321 void via_debug_dump(void)
322 {
323         printk(KERN_DEBUG "VIA1: DDRA = 0x%02X DDRB = 0x%02X ACR = 0x%02X\n",
324                 (uint) via1[vDirA], (uint) via1[vDirB], (uint) via1[vACR]);
325         printk(KERN_DEBUG "         PCR = 0x%02X  IFR = 0x%02X IER = 0x%02X\n",
326                 (uint) via1[vPCR], (uint) via1[vIFR], (uint) via1[vIER]);
327         if (oss_present) {
328                 printk(KERN_DEBUG "VIA2: <OSS>\n");
329         } else if (rbv_present) {
330                 printk(KERN_DEBUG "VIA2:  IFR = 0x%02X  IER = 0x%02X\n",
331                         (uint) via2[rIFR], (uint) via2[rIER]);
332                 printk(KERN_DEBUG "      SIFR = 0x%02X SIER = 0x%02X\n",
333                         (uint) via2[rSIFR], (uint) via2[rSIER]);
334         } else {
335                 printk(KERN_DEBUG "VIA2: DDRA = 0x%02X DDRB = 0x%02X ACR = 0x%02X\n",
336                         (uint) via2[vDirA], (uint) via2[vDirB],
337                         (uint) via2[vACR]);
338                 printk(KERN_DEBUG "         PCR = 0x%02X  IFR = 0x%02X IER = 0x%02X\n",
339                         (uint) via2[vPCR],
340                         (uint) via2[vIFR], (uint) via2[vIER]);
341         }
342 }
343 
344 /*
345  * This is always executed with interrupts disabled.
346  *
347  * TBI: get time offset between scheduling timer ticks
348  */
349 
350 unsigned long mac_gettimeoffset (void)
351 {
352         unsigned long ticks, offset = 0;
353 
354         /* read VIA1 timer 2 current value */
355         ticks = via1[vT1CL] | (via1[vT1CH] << 8);
356         /* The probability of underflow is less than 2% */
357         if (ticks > MAC_CLOCK_TICK - MAC_CLOCK_TICK / 50)
358                 /* Check for pending timer interrupt in VIA1 IFR */
359                 if (via1[vIFR] & 0x40) offset = TICK_SIZE;
360 
361         ticks = MAC_CLOCK_TICK - ticks;
362         ticks = ticks * 10000L / MAC_CLOCK_TICK;
363 
364         return ticks + offset;
365 }
366 
367 /*
368  * Flush the L2 cache on Macs that have it by flipping
369  * the system into 24-bit mode for an instant.
370  */
371 
372 void via_flush_cache(void)
373 {
374         via2[gBufB] &= ~VIA2B_vMode32;
375         via2[gBufB] |= VIA2B_vMode32;
376 }
377 
378 /*
379  * Return the status of the L2 cache on a IIci
380  */
381 
382 int via_get_cache_disable(void)
383 {
384         /* Safeguard against being called accidentally */
385         if (!via2) {
386                 printk(KERN_ERR "via_get_cache_disable called on a non-VIA machine!\n");
387                 return 1;
388         }
389 
390         return (int) via2[gBufB] & VIA2B_vCDis;
391 }
392 
393 /*
394  * Initialize VIA2 for Nubus access
395  */
396 
397 void __init via_nubus_init(void)
398 {
399         /* unlock nubus transactions */
400 
401         if ((macintosh_config->adb_type != MAC_ADB_PB1) &&
402             (macintosh_config->adb_type != MAC_ADB_PB2)) {
403                 /* set the line to be an output on non-RBV machines */
404                 if (!rbv_present)
405                         via2[vDirB] |= 0x02;
406 
407                 /* this seems to be an ADB bit on PMU machines */
408                 /* according to MkLinux.  -- jmt               */
409                 via2[gBufB] |= 0x02;
410         }
411 
412         /* Disable all the slot interrupts (where possible). */
413 
414         switch (macintosh_config->via_type) {
415         case MAC_VIA_II:
416                 /* Just make the port A lines inputs. */
417                 switch(macintosh_config->ident) {
418                 case MAC_MODEL_II:
419                 case MAC_MODEL_IIX:
420                 case MAC_MODEL_IICX:
421                 case MAC_MODEL_SE30:
422                         /* The top two bits are RAM size outputs. */
423                         via2[vDirA] &= 0xC0;
424                         break;
425                 default:
426                         via2[vDirA] &= 0x80;
427                 }
428                 break;
429         case MAC_VIA_IIci:
430                 /* RBV. Disable all the slot interrupts. SIER works like IER. */
431                 via2[rSIER] = 0x7F;
432                 break;
433         case MAC_VIA_QUADRA:
434                 /* Disable the inactive slot interrupts by making those lines outputs. */
435                 if ((macintosh_config->adb_type != MAC_ADB_PB1) &&
436                     (macintosh_config->adb_type != MAC_ADB_PB2)) {
437                         via2[vBufA] |= 0x7F;
438                         via2[vDirA] |= 0x7F;
439                 }
440                 break;
441         }
442 }
443 
444 /*
445  * The generic VIA interrupt routines (shamelessly stolen from Alan Cox's
446  * via6522.c :-), disable/pending masks added.
447  */
448 
449 irqreturn_t via1_irq(int irq, void *dev_id)
450 {
451         int irq_num;
452         unsigned char irq_bit, events;
453 
454         events = via1[vIFR] & via1[vIER] & 0x7F;
455         if (!events)
456                 return IRQ_NONE;
457 
458         irq_num = VIA1_SOURCE_BASE;
459         irq_bit = 1;
460         do {
461                 if (events & irq_bit) {
462                         via1[vIFR] = irq_bit;
463                         m68k_handle_int(irq_num);
464                 }
465                 ++irq_num;
466                 irq_bit <<= 1;
467         } while (events >= irq_bit);
468         return IRQ_HANDLED;
469 }
470 
471 irqreturn_t via2_irq(int irq, void *dev_id)
472 {
473         int irq_num;
474         unsigned char irq_bit, events;
475 
476         events = via2[gIFR] & via2[gIER] & 0x7F;
477         if (!events)
478                 return IRQ_NONE;
479 
480         irq_num = VIA2_SOURCE_BASE;
481         irq_bit = 1;
482         do {
483                 if (events & irq_bit) {
484                         via2[gIFR] = irq_bit | rbv_clear;
485                         m68k_handle_int(irq_num);
486                 }
487                 ++irq_num;
488                 irq_bit <<= 1;
489         } while (events >= irq_bit);
490         return IRQ_HANDLED;
491 }
492 
493 /*
494  * Dispatch Nubus interrupts. We are called as a secondary dispatch by the
495  * VIA2 dispatcher as a fast interrupt handler.
496  */
497 
498 irqreturn_t via_nubus_irq(int irq, void *dev_id)
499 {
500         int slot_irq;
501         unsigned char slot_bit, events;
502 
503         events = ~via2[gBufA] & 0x7F;
504         if (rbv_present)
505                 events &= via2[rSIER];
506         else
507                 events &= ~via2[vDirA];
508         if (!events)
509                 return IRQ_NONE;
510 
511         do {
512                 slot_irq = IRQ_NUBUS_F;
513                 slot_bit = 0x40;
514                 do {
515                         if (events & slot_bit) {
516                                 events &= ~slot_bit;
517                                 m68k_handle_int(slot_irq);
518                         }
519                         --slot_irq;
520                         slot_bit >>= 1;
521                 } while (events);
522 
523                 /* clear the CA1 interrupt and make certain there's no more. */
524                 via2[gIFR] = 0x02 | rbv_clear;
525                 events = ~via2[gBufA] & 0x7F;
526                 if (rbv_present)
527                         events &= via2[rSIER];
528                 else
529                         events &= ~via2[vDirA];
530         } while (events);
531         return IRQ_HANDLED;
532 }
533 
534 void via_irq_enable(int irq) {
535         int irq_src     = IRQ_SRC(irq);
536         int irq_idx     = IRQ_IDX(irq);
537 
538 #ifdef DEBUG_IRQUSE
539         printk(KERN_DEBUG "via_irq_enable(%d)\n", irq);
540 #endif
541 
542         if (irq_src == 1) {
543                 via1[vIER] = IER_SET_BIT(irq_idx);
544         } else if (irq_src == 2) {
545                 if (irq != IRQ_MAC_NUBUS || nubus_disabled == 0)
546                         via2[gIER] = IER_SET_BIT(irq_idx);
547         } else if (irq_src == 7) {
548                 switch (macintosh_config->via_type) {
549                 case MAC_VIA_II:
550                         nubus_disabled &= ~(1 << irq_idx);
551                         /* Enable the CA1 interrupt when no slot is disabled. */
552                         if (!nubus_disabled)
553                                 via2[gIER] = IER_SET_BIT(1);
554                         break;
555                 case MAC_VIA_IIci:
556                         /* On RBV, enable the slot interrupt.
557                          * SIER works like IER.
558                          */
559                         via2[rSIER] = IER_SET_BIT(irq_idx);
560                         break;
561                 case MAC_VIA_QUADRA:
562                         /* Make the port A line an input to enable the slot irq.
563                          * But not on PowerBooks, that's ADB.
564                          */
565                         if ((macintosh_config->adb_type != MAC_ADB_PB1) &&
566                             (macintosh_config->adb_type != MAC_ADB_PB2))
567                                 via2[vDirA] &= ~(1 << irq_idx);
568                         break;
569                 }
570         }
571 }
572 
573 void via_irq_disable(int irq) {
574         int irq_src     = IRQ_SRC(irq);
575         int irq_idx     = IRQ_IDX(irq);
576 
577 #ifdef DEBUG_IRQUSE
578         printk(KERN_DEBUG "via_irq_disable(%d)\n", irq);
579 #endif
580 
581         if (irq_src == 1) {
582                 via1[vIER] = IER_CLR_BIT(irq_idx);
583         } else if (irq_src == 2) {
584                 via2[gIER] = IER_CLR_BIT(irq_idx);
585         } else if (irq_src == 7) {
586                 switch (macintosh_config->via_type) {
587                 case MAC_VIA_II:
588                         nubus_disabled |= 1 << irq_idx;
589                         if (nubus_disabled)
590                                 via2[gIER] = IER_CLR_BIT(1);
591                         break;
592                 case MAC_VIA_IIci:
593                         via2[rSIER] = IER_CLR_BIT(irq_idx);
594                         break;
595                 case MAC_VIA_QUADRA:
596                         if ((macintosh_config->adb_type != MAC_ADB_PB1) &&
597                             (macintosh_config->adb_type != MAC_ADB_PB2))
598                                 via2[vDirA] |= 1 << irq_idx;
599                         break;
600                 }
601         }
602 }
603 
604 void via_irq_clear(int irq) {
605         int irq_src     = IRQ_SRC(irq);
606         int irq_idx     = IRQ_IDX(irq);
607         int irq_bit     = 1 << irq_idx;
608 
609         if (irq_src == 1) {
610                 via1[vIFR] = irq_bit;
611         } else if (irq_src == 2) {
612                 via2[gIFR] = irq_bit | rbv_clear;
613         } else if (irq_src == 7) {
614                 /* FIXME: There is no way to clear an individual nubus slot
615                  * IRQ flag, other than getting the device to do it.
616                  */
617         }
618 }
619 
620 /*
621  * Returns nonzero if an interrupt is pending on the given
622  * VIA/IRQ combination.
623  */
624 
625 int via_irq_pending(int irq)
626 {
627         int irq_src     = IRQ_SRC(irq);
628         int irq_idx     = IRQ_IDX(irq);
629         int irq_bit     = 1 << irq_idx;
630 
631         if (irq_src == 1) {
632                 return via1[vIFR] & irq_bit;
633         } else if (irq_src == 2) {
634                 return via2[gIFR] & irq_bit;
635         } else if (irq_src == 7) {
636                 /* Always 0 for MAC_VIA_QUADRA if the slot irq is disabled. */
637                 return ~via2[gBufA] & irq_bit;
638         }
639         return 0;
640 }
641 
642 void via1_set_head(int head)
643 {
644         if (head == 0)
645                 via1[vBufA] &= ~VIA1A_vHeadSel;
646         else
647                 via1[vBufA] |= VIA1A_vHeadSel;
648 }
649 EXPORT_SYMBOL(via1_set_head);
650 

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