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Linux/arch/m68k/mac/via.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  *      6522 Versatile Interface Adapter (VIA)
  4  *
  5  *      There are two of these on the Mac II. Some IRQs are vectored
  6  *      via them as are assorted bits and bobs - eg RTC, ADB.
  7  *
  8  * CSA: Motorola seems to have removed documentation on the 6522 from
  9  * their web site; try
 10  *     http://nerini.drf.com/vectrex/other/text/chips/6522/
 11  *     http://www.zymurgy.net/classic/vic20/vicdet1.htm
 12  * and
 13  *     http://193.23.168.87/mikro_laborversuche/via_iobaustein/via6522_1.html
 14  * for info.  A full-text web search on 6522 AND VIA will probably also
 15  * net some usefulness. <cananian@alumni.princeton.edu> 20apr1999
 16  *
 17  * Additional data is here (the SY6522 was used in the Mac II etc):
 18  *     http://www.6502.org/documents/datasheets/synertek/synertek_sy6522.pdf
 19  *     http://www.6502.org/documents/datasheets/synertek/synertek_sy6522_programming_reference.pdf
 20  *
 21  * PRAM/RTC access algorithms are from the NetBSD RTC toolkit version 1.08b
 22  * by Erik Vogan and adapted to Linux by Joshua M. Thompson (funaho@jurai.org)
 23  *
 24  */
 25 
 26 #include <linux/types.h>
 27 #include <linux/kernel.h>
 28 #include <linux/mm.h>
 29 #include <linux/delay.h>
 30 #include <linux/init.h>
 31 #include <linux/module.h>
 32 #include <linux/irq.h>
 33 
 34 #include <asm/macintosh.h>
 35 #include <asm/macints.h>
 36 #include <asm/mac_via.h>
 37 #include <asm/mac_psc.h>
 38 #include <asm/mac_oss.h>
 39 
 40 volatile __u8 *via1, *via2;
 41 int rbv_present;
 42 int via_alt_mapping;
 43 EXPORT_SYMBOL(via_alt_mapping);
 44 static __u8 rbv_clear;
 45 
 46 /*
 47  * Globals for accessing the VIA chip registers without having to
 48  * check if we're hitting a real VIA or an RBV. Normally you could
 49  * just hit the combined register (ie, vIER|rIER) but that seems to
 50  * break on AV Macs...probably because they actually decode more than
 51  * eight address bits. Why can't Apple engineers at least be
 52  * _consistently_ lazy?                          - 1999-05-21 (jmt)
 53  */
 54 
 55 static int gIER,gIFR,gBufA,gBufB;
 56 
 57 /*
 58  * Timer defs.
 59  */
 60 
 61 #define TICK_SIZE               10000
 62 #define MAC_CLOCK_TICK          (783300/HZ)             /* ticks per HZ */
 63 #define MAC_CLOCK_LOW           (MAC_CLOCK_TICK&0xFF)
 64 #define MAC_CLOCK_HIGH          (MAC_CLOCK_TICK>>8)
 65 
 66 
 67 /*
 68  * On Macs with a genuine VIA chip there is no way to mask an individual slot
 69  * interrupt. This limitation also seems to apply to VIA clone logic cores in
 70  * Quadra-like ASICs. (RBV and OSS machines don't have this limitation.)
 71  *
 72  * We used to fake it by configuring the relevant VIA pin as an output
 73  * (to mask the interrupt) or input (to unmask). That scheme did not work on
 74  * (at least) the Quadra 700. A NuBus card's /NMRQ signal is an open-collector
 75  * circuit (see Designing Cards and Drivers for Macintosh II and Macintosh SE,
 76  * p. 10-11 etc) but VIA outputs are not (see datasheet).
 77  *
 78  * Driving these outputs high must cause the VIA to source current and the
 79  * card to sink current when it asserts /NMRQ. Current will flow but the pin
 80  * voltage is uncertain and so the /NMRQ condition may still cause a transition
 81  * at the VIA2 CA1 input (which explains the lost interrupts). A side effect
 82  * is that a disabled slot IRQ can never be tested as pending or not.
 83  *
 84  * Driving these outputs low doesn't work either. All the slot /NMRQ lines are
 85  * (active low) OR'd together to generate the CA1 (aka "SLOTS") interrupt (see
 86  * The Guide To Macintosh Family Hardware, 2nd edition p. 167). If we drive a
 87  * disabled /NMRQ line low, the falling edge immediately triggers a CA1
 88  * interrupt and all slot interrupts after that will generate no transition
 89  * and therefore no interrupt, even after being re-enabled.
 90  *
 91  * So we make the VIA port A I/O lines inputs and use nubus_disabled to keep
 92  * track of their states. When any slot IRQ becomes disabled we mask the CA1
 93  * umbrella interrupt. Only when all slot IRQs become enabled do we unmask
 94  * the CA1 interrupt. It must remain enabled even when cards have no interrupt
 95  * handler registered. Drivers must therefore disable a slot interrupt at the
 96  * device before they call free_irq (like shared and autovector interrupts).
 97  *
 98  * There is also a related problem when MacOS is used to boot Linux. A network
 99  * card brought up by a MacOS driver may raise an interrupt while Linux boots.
100  * This can be fatal since it can't be handled until the right driver loads
101  * (if such a driver exists at all). Apparently related to this hardware
102  * limitation, "Designing Cards and Drivers", p. 9-8, says that a slot
103  * interrupt with no driver would crash MacOS (the book was written before
104  * the appearance of Macs with RBV or OSS).
105  */
106 
107 static u8 nubus_disabled;
108 
109 void via_debug_dump(void);
110 static void via_nubus_init(void);
111 
112 /*
113  * Initialize the VIAs
114  *
115  * First we figure out where they actually _are_ as well as what type of
116  * VIA we have for VIA2 (it could be a real VIA or an RBV or even an OSS.)
117  * Then we pretty much clear them out and disable all IRQ sources.
118  */
119 
120 void __init via_init(void)
121 {
122         via1 = (void *)VIA1_BASE;
123         pr_debug("VIA1 detected at %p\n", via1);
124 
125         if (oss_present) {
126                 via2 = NULL;
127                 rbv_present = 0;
128         } else {
129                 switch (macintosh_config->via_type) {
130 
131                 /* IIci, IIsi, IIvx, IIvi (P6xx), LC series */
132 
133                 case MAC_VIA_IICI:
134                         via2 = (void *)RBV_BASE;
135                         pr_debug("VIA2 (RBV) detected at %p\n", via2);
136                         rbv_present = 1;
137                         if (macintosh_config->ident == MAC_MODEL_LCIII) {
138                                 rbv_clear = 0x00;
139                         } else {
140                                 /* on most RBVs (& unlike the VIAs), you   */
141                                 /* need to set bit 7 when you write to IFR */
142                                 /* in order for your clear to occur.       */
143                                 rbv_clear = 0x80;
144                         }
145                         gIER = rIER;
146                         gIFR = rIFR;
147                         gBufA = rSIFR;
148                         gBufB = rBufB;
149                         break;
150 
151                 /* Quadra and early MacIIs agree on the VIA locations */
152 
153                 case MAC_VIA_QUADRA:
154                 case MAC_VIA_II:
155                         via2 = (void *) VIA2_BASE;
156                         pr_debug("VIA2 detected at %p\n", via2);
157                         rbv_present = 0;
158                         rbv_clear = 0x00;
159                         gIER = vIER;
160                         gIFR = vIFR;
161                         gBufA = vBufA;
162                         gBufB = vBufB;
163                         break;
164 
165                 default:
166                         panic("UNKNOWN VIA TYPE");
167                 }
168         }
169 
170 #ifdef DEBUG_VIA
171         via_debug_dump();
172 #endif
173 
174         /*
175          * Shut down all IRQ sources, reset the timers, and
176          * kill the timer latch on VIA1.
177          */
178 
179         via1[vIER] = 0x7F;
180         via1[vIFR] = 0x7F;
181         via1[vT1LL] = 0;
182         via1[vT1LH] = 0;
183         via1[vT1CL] = 0;
184         via1[vT1CH] = 0;
185         via1[vT2CL] = 0;
186         via1[vT2CH] = 0;
187         via1[vACR] &= ~0xC0; /* setup T1 timer with no PB7 output */
188         via1[vACR] &= ~0x03; /* disable port A & B latches */
189 
190         /*
191          * SE/30: disable video IRQ
192          * XXX: testing for SE/30 VBL
193          */
194 
195         if (macintosh_config->ident == MAC_MODEL_SE30) {
196                 via1[vDirB] |= 0x40;
197                 via1[vBufB] |= 0x40;
198         }
199 
200         /*
201          * Set the RTC bits to a known state: all lines to outputs and
202          * RTC disabled (yes that's 0 to enable and 1 to disable).
203          */
204 
205         via1[vDirB] |= (VIA1B_vRTCEnb | VIA1B_vRTCClk | VIA1B_vRTCData);
206         via1[vBufB] |= (VIA1B_vRTCEnb | VIA1B_vRTCClk);
207 
208         /* Everything below this point is VIA2/RBV only... */
209 
210         if (oss_present)
211                 return;
212 
213         if ((macintosh_config->via_type == MAC_VIA_QUADRA) &&
214             (macintosh_config->adb_type != MAC_ADB_PB1) &&
215             (macintosh_config->adb_type != MAC_ADB_PB2) &&
216             (macintosh_config->ident    != MAC_MODEL_C660) &&
217             (macintosh_config->ident    != MAC_MODEL_Q840)) {
218                 via_alt_mapping = 1;
219                 via1[vDirB] |= 0x40;
220                 via1[vBufB] &= ~0x40;
221         } else {
222                 via_alt_mapping = 0;
223         }
224 
225         /*
226          * Now initialize VIA2. For RBV we just kill all interrupts;
227          * for a regular VIA we also reset the timers and stuff.
228          */
229 
230         via2[gIER] = 0x7F;
231         via2[gIFR] = 0x7F | rbv_clear;
232         if (!rbv_present) {
233                 via2[vT1LL] = 0;
234                 via2[vT1LH] = 0;
235                 via2[vT1CL] = 0;
236                 via2[vT1CH] = 0;
237                 via2[vT2CL] = 0;
238                 via2[vT2CH] = 0;
239                 via2[vACR] &= ~0xC0; /* setup T1 timer with no PB7 output */
240                 via2[vACR] &= ~0x03; /* disable port A & B latches */
241         }
242 
243         via_nubus_init();
244 
245         /* Everything below this point is VIA2 only... */
246 
247         if (rbv_present)
248                 return;
249 
250         /*
251          * Set vPCR for control line interrupts.
252          *
253          * CA1 (SLOTS IRQ), CB1 (ASC IRQ): negative edge trigger.
254          *
255          * Macs with ESP SCSI have a negative edge triggered SCSI interrupt.
256          * Testing reveals that PowerBooks do too. However, the SE/30
257          * schematic diagram shows an active high NCR5380 IRQ line.
258          */
259 
260         pr_debug("VIA2 vPCR is 0x%02X\n", via2[vPCR]);
261         if (macintosh_config->via_type == MAC_VIA_II) {
262                 /* CA2 (SCSI DRQ), CB2 (SCSI IRQ): indep. input, pos. edge */
263                 via2[vPCR] = 0x66;
264         } else {
265                 /* CA2 (SCSI DRQ), CB2 (SCSI IRQ): indep. input, neg. edge */
266                 via2[vPCR] = 0x22;
267         }
268 }
269 
270 /*
271  * Start the 100 Hz clock
272  */
273 
274 void __init via_init_clock(irq_handler_t func)
275 {
276         via1[vACR] |= 0x40;
277         via1[vT1LL] = MAC_CLOCK_LOW;
278         via1[vT1LH] = MAC_CLOCK_HIGH;
279         via1[vT1CL] = MAC_CLOCK_LOW;
280         via1[vT1CH] = MAC_CLOCK_HIGH;
281 
282         if (request_irq(IRQ_MAC_TIMER_1, func, 0, "timer", func))
283                 pr_err("Couldn't register %s interrupt\n", "timer");
284 }
285 
286 /*
287  * Debugging dump, used in various places to see what's going on.
288  */
289 
290 void via_debug_dump(void)
291 {
292         printk(KERN_DEBUG "VIA1: DDRA = 0x%02X DDRB = 0x%02X ACR = 0x%02X\n",
293                 (uint) via1[vDirA], (uint) via1[vDirB], (uint) via1[vACR]);
294         printk(KERN_DEBUG "         PCR = 0x%02X  IFR = 0x%02X IER = 0x%02X\n",
295                 (uint) via1[vPCR], (uint) via1[vIFR], (uint) via1[vIER]);
296         if (!via2)
297                 return;
298         if (rbv_present) {
299                 printk(KERN_DEBUG "VIA2:  IFR = 0x%02X  IER = 0x%02X\n",
300                         (uint) via2[rIFR], (uint) via2[rIER]);
301                 printk(KERN_DEBUG "      SIFR = 0x%02X SIER = 0x%02X\n",
302                         (uint) via2[rSIFR], (uint) via2[rSIER]);
303         } else {
304                 printk(KERN_DEBUG "VIA2: DDRA = 0x%02X DDRB = 0x%02X ACR = 0x%02X\n",
305                         (uint) via2[vDirA], (uint) via2[vDirB],
306                         (uint) via2[vACR]);
307                 printk(KERN_DEBUG "         PCR = 0x%02X  IFR = 0x%02X IER = 0x%02X\n",
308                         (uint) via2[vPCR],
309                         (uint) via2[vIFR], (uint) via2[vIER]);
310         }
311 }
312 
313 /*
314  * This is always executed with interrupts disabled.
315  *
316  * TBI: get time offset between scheduling timer ticks
317  */
318 
319 u32 mac_gettimeoffset(void)
320 {
321         unsigned long ticks, offset = 0;
322 
323         /* read VIA1 timer 2 current value */
324         ticks = via1[vT1CL] | (via1[vT1CH] << 8);
325         /* The probability of underflow is less than 2% */
326         if (ticks > MAC_CLOCK_TICK - MAC_CLOCK_TICK / 50)
327                 /* Check for pending timer interrupt in VIA1 IFR */
328                 if (via1[vIFR] & 0x40) offset = TICK_SIZE;
329 
330         ticks = MAC_CLOCK_TICK - ticks;
331         ticks = ticks * 10000L / MAC_CLOCK_TICK;
332 
333         return (ticks + offset) * 1000;
334 }
335 
336 /*
337  * Flush the L2 cache on Macs that have it by flipping
338  * the system into 24-bit mode for an instant.
339  */
340 
341 void via_flush_cache(void)
342 {
343         via2[gBufB] &= ~VIA2B_vMode32;
344         via2[gBufB] |= VIA2B_vMode32;
345 }
346 
347 /*
348  * Return the status of the L2 cache on a IIci
349  */
350 
351 int via_get_cache_disable(void)
352 {
353         /* Safeguard against being called accidentally */
354         if (!via2) {
355                 printk(KERN_ERR "via_get_cache_disable called on a non-VIA machine!\n");
356                 return 1;
357         }
358 
359         return (int) via2[gBufB] & VIA2B_vCDis;
360 }
361 
362 /*
363  * Initialize VIA2 for Nubus access
364  */
365 
366 static void __init via_nubus_init(void)
367 {
368         /* unlock nubus transactions */
369 
370         if ((macintosh_config->adb_type != MAC_ADB_PB1) &&
371             (macintosh_config->adb_type != MAC_ADB_PB2)) {
372                 /* set the line to be an output on non-RBV machines */
373                 if (!rbv_present)
374                         via2[vDirB] |= 0x02;
375 
376                 /* this seems to be an ADB bit on PMU machines */
377                 /* according to MkLinux.  -- jmt               */
378                 via2[gBufB] |= 0x02;
379         }
380 
381         /*
382          * Disable the slot interrupts. On some hardware that's not possible.
383          * On some hardware it's unclear what all of these I/O lines do.
384          */
385 
386         switch (macintosh_config->via_type) {
387         case MAC_VIA_II:
388         case MAC_VIA_QUADRA:
389                 pr_debug("VIA2 vDirA is 0x%02X\n", via2[vDirA]);
390                 break;
391         case MAC_VIA_IICI:
392                 /* RBV. Disable all the slot interrupts. SIER works like IER. */
393                 via2[rSIER] = 0x7F;
394                 break;
395         }
396 }
397 
398 void via_nubus_irq_startup(int irq)
399 {
400         int irq_idx = IRQ_IDX(irq);
401 
402         switch (macintosh_config->via_type) {
403         case MAC_VIA_II:
404         case MAC_VIA_QUADRA:
405                 /* Make the port A line an input. Probably redundant. */
406                 if (macintosh_config->via_type == MAC_VIA_II) {
407                         /* The top two bits are RAM size outputs. */
408                         via2[vDirA] &= 0xC0 | ~(1 << irq_idx);
409                 } else {
410                         /* Allow NuBus slots 9 through F. */
411                         via2[vDirA] &= 0x80 | ~(1 << irq_idx);
412                 }
413                 /* fall through */
414         case MAC_VIA_IICI:
415                 via_irq_enable(irq);
416                 break;
417         }
418 }
419 
420 void via_nubus_irq_shutdown(int irq)
421 {
422         switch (macintosh_config->via_type) {
423         case MAC_VIA_II:
424         case MAC_VIA_QUADRA:
425                 /* Ensure that the umbrella CA1 interrupt remains enabled. */
426                 via_irq_enable(irq);
427                 break;
428         case MAC_VIA_IICI:
429                 via_irq_disable(irq);
430                 break;
431         }
432 }
433 
434 /*
435  * The generic VIA interrupt routines (shamelessly stolen from Alan Cox's
436  * via6522.c :-), disable/pending masks added.
437  */
438 
439 void via1_irq(struct irq_desc *desc)
440 {
441         int irq_num;
442         unsigned char irq_bit, events;
443 
444         events = via1[vIFR] & via1[vIER] & 0x7F;
445         if (!events)
446                 return;
447 
448         irq_num = VIA1_SOURCE_BASE;
449         irq_bit = 1;
450         do {
451                 if (events & irq_bit) {
452                         via1[vIFR] = irq_bit;
453                         generic_handle_irq(irq_num);
454                 }
455                 ++irq_num;
456                 irq_bit <<= 1;
457         } while (events >= irq_bit);
458 }
459 
460 static void via2_irq(struct irq_desc *desc)
461 {
462         int irq_num;
463         unsigned char irq_bit, events;
464 
465         events = via2[gIFR] & via2[gIER] & 0x7F;
466         if (!events)
467                 return;
468 
469         irq_num = VIA2_SOURCE_BASE;
470         irq_bit = 1;
471         do {
472                 if (events & irq_bit) {
473                         via2[gIFR] = irq_bit | rbv_clear;
474                         generic_handle_irq(irq_num);
475                 }
476                 ++irq_num;
477                 irq_bit <<= 1;
478         } while (events >= irq_bit);
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 static void via_nubus_irq(struct irq_desc *desc)
487 {
488         int slot_irq;
489         unsigned char slot_bit, events;
490 
491         events = ~via2[gBufA] & 0x7F;
492         if (rbv_present)
493                 events &= via2[rSIER];
494         else
495                 events &= ~via2[vDirA];
496         if (!events)
497                 return;
498 
499         do {
500                 slot_irq = IRQ_NUBUS_F;
501                 slot_bit = 0x40;
502                 do {
503                         if (events & slot_bit) {
504                                 events &= ~slot_bit;
505                                 generic_handle_irq(slot_irq);
506                         }
507                         --slot_irq;
508                         slot_bit >>= 1;
509                 } while (events);
510 
511                 /* clear the CA1 interrupt and make certain there's no more. */
512                 via2[gIFR] = 0x02 | rbv_clear;
513                 events = ~via2[gBufA] & 0x7F;
514                 if (rbv_present)
515                         events &= via2[rSIER];
516                 else
517                         events &= ~via2[vDirA];
518         } while (events);
519 }
520 
521 /*
522  * Register the interrupt dispatchers for VIA or RBV machines only.
523  */
524 
525 void __init via_register_interrupts(void)
526 {
527         if (via_alt_mapping) {
528                 /* software interrupt */
529                 irq_set_chained_handler(IRQ_AUTO_1, via1_irq);
530                 /* via1 interrupt */
531                 irq_set_chained_handler(IRQ_AUTO_6, via1_irq);
532         } else {
533                 irq_set_chained_handler(IRQ_AUTO_1, via1_irq);
534         }
535         irq_set_chained_handler(IRQ_AUTO_2, via2_irq);
536         irq_set_chained_handler(IRQ_MAC_NUBUS, via_nubus_irq);
537 }
538 
539 void via_irq_enable(int irq) {
540         int irq_src     = IRQ_SRC(irq);
541         int irq_idx     = IRQ_IDX(irq);
542 
543         if (irq_src == 1) {
544                 via1[vIER] = IER_SET_BIT(irq_idx);
545         } else if (irq_src == 2) {
546                 if (irq != IRQ_MAC_NUBUS || nubus_disabled == 0)
547                         via2[gIER] = IER_SET_BIT(irq_idx);
548         } else if (irq_src == 7) {
549                 switch (macintosh_config->via_type) {
550                 case MAC_VIA_II:
551                 case MAC_VIA_QUADRA:
552                         nubus_disabled &= ~(1 << irq_idx);
553                         /* Enable the CA1 interrupt when no slot is disabled. */
554                         if (!nubus_disabled)
555                                 via2[gIER] = IER_SET_BIT(1);
556                         break;
557                 case MAC_VIA_IICI:
558                         /* On RBV, enable the slot interrupt.
559                          * SIER works like IER.
560                          */
561                         via2[rSIER] = IER_SET_BIT(irq_idx);
562                         break;
563                 }
564         }
565 }
566 
567 void via_irq_disable(int irq) {
568         int irq_src     = IRQ_SRC(irq);
569         int irq_idx     = IRQ_IDX(irq);
570 
571         if (irq_src == 1) {
572                 via1[vIER] = IER_CLR_BIT(irq_idx);
573         } else if (irq_src == 2) {
574                 via2[gIER] = IER_CLR_BIT(irq_idx);
575         } else if (irq_src == 7) {
576                 switch (macintosh_config->via_type) {
577                 case MAC_VIA_II:
578                 case MAC_VIA_QUADRA:
579                         nubus_disabled |= 1 << irq_idx;
580                         if (nubus_disabled)
581                                 via2[gIER] = IER_CLR_BIT(1);
582                         break;
583                 case MAC_VIA_IICI:
584                         via2[rSIER] = IER_CLR_BIT(irq_idx);
585                         break;
586                 }
587         }
588 }
589 
590 void via1_set_head(int head)
591 {
592         if (head == 0)
593                 via1[vBufA] &= ~VIA1A_vHeadSel;
594         else
595                 via1[vBufA] |= VIA1A_vHeadSel;
596 }
597 EXPORT_SYMBOL(via1_set_head);
598 
599 int via2_scsi_drq_pending(void)
600 {
601         return via2[gIFR] & (1 << IRQ_IDX(IRQ_MAC_SCSIDRQ));
602 }
603 EXPORT_SYMBOL(via2_scsi_drq_pending);
604 

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