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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 
111 /*
112  * Initialize the VIAs
113  *
114  * First we figure out where they actually _are_ as well as what type of
115  * VIA we have for VIA2 (it could be a real VIA or an RBV or even an OSS.)
116  * Then we pretty much clear them out and disable all IRQ sources.
117  *
118  * Note: the OSS is actually "detected" here and not in oss_init(). It just
119  *       seems more logical to do it here since via_init() needs to know
120  *       these things anyways.
121  */
122 
123 void __init via_init(void)
124 {
125         switch(macintosh_config->via_type) {
126 
127                 /* IIci, IIsi, IIvx, IIvi (P6xx), LC series */
128 
129                 case MAC_VIA_IICI:
130                         via1 = (void *) VIA1_BASE;
131                         if (macintosh_config->ident == MAC_MODEL_IIFX) {
132                                 via2 = NULL;
133                                 rbv_present = 0;
134                                 oss_present = 1;
135                         } else {
136                                 via2 = (void *) RBV_BASE;
137                                 rbv_present = 1;
138                                 oss_present = 0;
139                         }
140                         if (macintosh_config->ident == MAC_MODEL_LCIII) {
141                                 rbv_clear = 0x00;
142                         } else {
143                                 /* on most RBVs (& unlike the VIAs), you   */
144                                 /* need to set bit 7 when you write to IFR */
145                                 /* in order for your clear to occur.       */
146                                 rbv_clear = 0x80;
147                         }
148                         gIER = rIER;
149                         gIFR = rIFR;
150                         gBufA = rSIFR;
151                         gBufB = rBufB;
152                         break;
153 
154                 /* Quadra and early MacIIs agree on the VIA locations */
155 
156                 case MAC_VIA_QUADRA:
157                 case MAC_VIA_II:
158                         via1 = (void *) VIA1_BASE;
159                         via2 = (void *) VIA2_BASE;
160                         rbv_present = 0;
161                         oss_present = 0;
162                         rbv_clear = 0x00;
163                         gIER = vIER;
164                         gIFR = vIFR;
165                         gBufA = vBufA;
166                         gBufB = vBufB;
167                         break;
168                 default:
169                         panic("UNKNOWN VIA TYPE");
170         }
171 
172         printk(KERN_INFO "VIA1 at %p is a 6522 or clone\n", via1);
173 
174         printk(KERN_INFO "VIA2 at %p is ", via2);
175         if (rbv_present) {
176                 printk("an RBV\n");
177         } else if (oss_present) {
178                 printk("an OSS\n");
179         } else {
180                 printk("a 6522 or clone\n");
181         }
182 
183 #ifdef DEBUG_VIA
184         via_debug_dump();
185 #endif
186 
187         /*
188          * Shut down all IRQ sources, reset the timers, and
189          * kill the timer latch on VIA1.
190          */
191 
192         via1[vIER] = 0x7F;
193         via1[vIFR] = 0x7F;
194         via1[vT1LL] = 0;
195         via1[vT1LH] = 0;
196         via1[vT1CL] = 0;
197         via1[vT1CH] = 0;
198         via1[vT2CL] = 0;
199         via1[vT2CH] = 0;
200         via1[vACR] &= ~0xC0; /* setup T1 timer with no PB7 output */
201         via1[vACR] &= ~0x03; /* disable port A & B latches */
202 
203         /*
204          * SE/30: disable video IRQ
205          * XXX: testing for SE/30 VBL
206          */
207 
208         if (macintosh_config->ident == MAC_MODEL_SE30) {
209                 via1[vDirB] |= 0x40;
210                 via1[vBufB] |= 0x40;
211         }
212 
213         /*
214          * Set the RTC bits to a known state: all lines to outputs and
215          * RTC disabled (yes that's 0 to enable and 1 to disable).
216          */
217 
218         via1[vDirB] |= (VIA1B_vRTCEnb | VIA1B_vRTCClk | VIA1B_vRTCData);
219         via1[vBufB] |= (VIA1B_vRTCEnb | VIA1B_vRTCClk);
220 
221         /* Everything below this point is VIA2/RBV only... */
222 
223         if (oss_present)
224                 return;
225 
226         if ((macintosh_config->via_type == MAC_VIA_QUADRA) &&
227             (macintosh_config->adb_type != MAC_ADB_PB1) &&
228             (macintosh_config->adb_type != MAC_ADB_PB2) &&
229             (macintosh_config->ident    != MAC_MODEL_C660) &&
230             (macintosh_config->ident    != MAC_MODEL_Q840)) {
231                 via_alt_mapping = 1;
232                 via1[vDirB] |= 0x40;
233                 via1[vBufB] &= ~0x40;
234         } else {
235                 via_alt_mapping = 0;
236         }
237 
238         /*
239          * Now initialize VIA2. For RBV we just kill all interrupts;
240          * for a regular VIA we also reset the timers and stuff.
241          */
242 
243         via2[gIER] = 0x7F;
244         via2[gIFR] = 0x7F | rbv_clear;
245         if (!rbv_present) {
246                 via2[vT1LL] = 0;
247                 via2[vT1LH] = 0;
248                 via2[vT1CL] = 0;
249                 via2[vT1CH] = 0;
250                 via2[vT2CL] = 0;
251                 via2[vT2CH] = 0;
252                 via2[vACR] &= ~0xC0; /* setup T1 timer with no PB7 output */
253                 via2[vACR] &= ~0x03; /* disable port A & B latches */
254         }
255 
256         /* Everything below this point is VIA2 only... */
257 
258         if (rbv_present)
259                 return;
260 
261         /*
262          * Set vPCR for control line interrupts.
263          *
264          * CA1 (SLOTS IRQ), CB1 (ASC IRQ): negative edge trigger.
265          *
266          * Macs with ESP SCSI have a negative edge triggered SCSI interrupt.
267          * Testing reveals that PowerBooks do too. However, the SE/30
268          * schematic diagram shows an active high NCR5380 IRQ line.
269          */
270 
271         pr_debug("VIA2 vPCR is 0x%02X\n", via2[vPCR]);
272         if (macintosh_config->via_type == MAC_VIA_II) {
273                 /* CA2 (SCSI DRQ), CB2 (SCSI IRQ): indep. input, pos. edge */
274                 via2[vPCR] = 0x66;
275         } else {
276                 /* CA2 (SCSI DRQ), CB2 (SCSI IRQ): indep. input, neg. edge */
277                 via2[vPCR] = 0x22;
278         }
279 }
280 
281 /*
282  * Start the 100 Hz clock
283  */
284 
285 void __init via_init_clock(irq_handler_t func)
286 {
287         via1[vACR] |= 0x40;
288         via1[vT1LL] = MAC_CLOCK_LOW;
289         via1[vT1LH] = MAC_CLOCK_HIGH;
290         via1[vT1CL] = MAC_CLOCK_LOW;
291         via1[vT1CH] = MAC_CLOCK_HIGH;
292 
293         if (request_irq(IRQ_MAC_TIMER_1, func, 0, "timer", func))
294                 pr_err("Couldn't register %s interrupt\n", "timer");
295 }
296 
297 /*
298  * Debugging dump, used in various places to see what's going on.
299  */
300 
301 void via_debug_dump(void)
302 {
303         printk(KERN_DEBUG "VIA1: DDRA = 0x%02X DDRB = 0x%02X ACR = 0x%02X\n",
304                 (uint) via1[vDirA], (uint) via1[vDirB], (uint) via1[vACR]);
305         printk(KERN_DEBUG "         PCR = 0x%02X  IFR = 0x%02X IER = 0x%02X\n",
306                 (uint) via1[vPCR], (uint) via1[vIFR], (uint) via1[vIER]);
307         if (oss_present) {
308                 printk(KERN_DEBUG "VIA2: <OSS>\n");
309         } else if (rbv_present) {
310                 printk(KERN_DEBUG "VIA2:  IFR = 0x%02X  IER = 0x%02X\n",
311                         (uint) via2[rIFR], (uint) via2[rIER]);
312                 printk(KERN_DEBUG "      SIFR = 0x%02X SIER = 0x%02X\n",
313                         (uint) via2[rSIFR], (uint) via2[rSIER]);
314         } else {
315                 printk(KERN_DEBUG "VIA2: DDRA = 0x%02X DDRB = 0x%02X ACR = 0x%02X\n",
316                         (uint) via2[vDirA], (uint) via2[vDirB],
317                         (uint) via2[vACR]);
318                 printk(KERN_DEBUG "         PCR = 0x%02X  IFR = 0x%02X IER = 0x%02X\n",
319                         (uint) via2[vPCR],
320                         (uint) via2[vIFR], (uint) via2[vIER]);
321         }
322 }
323 
324 /*
325  * This is always executed with interrupts disabled.
326  *
327  * TBI: get time offset between scheduling timer ticks
328  */
329 
330 u32 mac_gettimeoffset(void)
331 {
332         unsigned long ticks, offset = 0;
333 
334         /* read VIA1 timer 2 current value */
335         ticks = via1[vT1CL] | (via1[vT1CH] << 8);
336         /* The probability of underflow is less than 2% */
337         if (ticks > MAC_CLOCK_TICK - MAC_CLOCK_TICK / 50)
338                 /* Check for pending timer interrupt in VIA1 IFR */
339                 if (via1[vIFR] & 0x40) offset = TICK_SIZE;
340 
341         ticks = MAC_CLOCK_TICK - ticks;
342         ticks = ticks * 10000L / MAC_CLOCK_TICK;
343 
344         return (ticks + offset) * 1000;
345 }
346 
347 /*
348  * Flush the L2 cache on Macs that have it by flipping
349  * the system into 24-bit mode for an instant.
350  */
351 
352 void via_flush_cache(void)
353 {
354         via2[gBufB] &= ~VIA2B_vMode32;
355         via2[gBufB] |= VIA2B_vMode32;
356 }
357 
358 /*
359  * Return the status of the L2 cache on a IIci
360  */
361 
362 int via_get_cache_disable(void)
363 {
364         /* Safeguard against being called accidentally */
365         if (!via2) {
366                 printk(KERN_ERR "via_get_cache_disable called on a non-VIA machine!\n");
367                 return 1;
368         }
369 
370         return (int) via2[gBufB] & VIA2B_vCDis;
371 }
372 
373 /*
374  * Initialize VIA2 for Nubus access
375  */
376 
377 void __init via_nubus_init(void)
378 {
379         /* unlock nubus transactions */
380 
381         if ((macintosh_config->adb_type != MAC_ADB_PB1) &&
382             (macintosh_config->adb_type != MAC_ADB_PB2)) {
383                 /* set the line to be an output on non-RBV machines */
384                 if (!rbv_present)
385                         via2[vDirB] |= 0x02;
386 
387                 /* this seems to be an ADB bit on PMU machines */
388                 /* according to MkLinux.  -- jmt               */
389                 via2[gBufB] |= 0x02;
390         }
391 
392         /*
393          * Disable the slot interrupts. On some hardware that's not possible.
394          * On some hardware it's unclear what all of these I/O lines do.
395          */
396 
397         switch (macintosh_config->via_type) {
398         case MAC_VIA_II:
399         case MAC_VIA_QUADRA:
400                 pr_debug("VIA2 vDirA is 0x%02X\n", via2[vDirA]);
401                 break;
402         case MAC_VIA_IICI:
403                 /* RBV. Disable all the slot interrupts. SIER works like IER. */
404                 via2[rSIER] = 0x7F;
405                 break;
406         }
407 }
408 
409 void via_nubus_irq_startup(int irq)
410 {
411         int irq_idx = IRQ_IDX(irq);
412 
413         switch (macintosh_config->via_type) {
414         case MAC_VIA_II:
415         case MAC_VIA_QUADRA:
416                 /* Make the port A line an input. Probably redundant. */
417                 if (macintosh_config->via_type == MAC_VIA_II) {
418                         /* The top two bits are RAM size outputs. */
419                         via2[vDirA] &= 0xC0 | ~(1 << irq_idx);
420                 } else {
421                         /* Allow NuBus slots 9 through F. */
422                         via2[vDirA] &= 0x80 | ~(1 << irq_idx);
423                 }
424                 /* fall through */
425         case MAC_VIA_IICI:
426                 via_irq_enable(irq);
427                 break;
428         }
429 }
430 
431 void via_nubus_irq_shutdown(int irq)
432 {
433         switch (macintosh_config->via_type) {
434         case MAC_VIA_II:
435         case MAC_VIA_QUADRA:
436                 /* Ensure that the umbrella CA1 interrupt remains enabled. */
437                 via_irq_enable(irq);
438                 break;
439         case MAC_VIA_IICI:
440                 via_irq_disable(irq);
441                 break;
442         }
443 }
444 
445 /*
446  * The generic VIA interrupt routines (shamelessly stolen from Alan Cox's
447  * via6522.c :-), disable/pending masks added.
448  */
449 
450 void via1_irq(struct irq_desc *desc)
451 {
452         int irq_num;
453         unsigned char irq_bit, events;
454 
455         events = via1[vIFR] & via1[vIER] & 0x7F;
456         if (!events)
457                 return;
458 
459         irq_num = VIA1_SOURCE_BASE;
460         irq_bit = 1;
461         do {
462                 if (events & irq_bit) {
463                         via1[vIFR] = irq_bit;
464                         generic_handle_irq(irq_num);
465                 }
466                 ++irq_num;
467                 irq_bit <<= 1;
468         } while (events >= irq_bit);
469 }
470 
471 static void via2_irq(struct irq_desc *desc)
472 {
473         int irq_num;
474         unsigned char irq_bit, events;
475 
476         events = via2[gIFR] & via2[gIER] & 0x7F;
477         if (!events)
478                 return;
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                         generic_handle_irq(irq_num);
486                 }
487                 ++irq_num;
488                 irq_bit <<= 1;
489         } while (events >= irq_bit);
490 }
491 
492 /*
493  * Dispatch Nubus interrupts. We are called as a secondary dispatch by the
494  * VIA2 dispatcher as a fast interrupt handler.
495  */
496 
497 static void via_nubus_irq(struct irq_desc *desc)
498 {
499         int slot_irq;
500         unsigned char slot_bit, events;
501 
502         events = ~via2[gBufA] & 0x7F;
503         if (rbv_present)
504                 events &= via2[rSIER];
505         else
506                 events &= ~via2[vDirA];
507         if (!events)
508                 return;
509 
510         do {
511                 slot_irq = IRQ_NUBUS_F;
512                 slot_bit = 0x40;
513                 do {
514                         if (events & slot_bit) {
515                                 events &= ~slot_bit;
516                                 generic_handle_irq(slot_irq);
517                         }
518                         --slot_irq;
519                         slot_bit >>= 1;
520                 } while (events);
521 
522                 /* clear the CA1 interrupt and make certain there's no more. */
523                 via2[gIFR] = 0x02 | rbv_clear;
524                 events = ~via2[gBufA] & 0x7F;
525                 if (rbv_present)
526                         events &= via2[rSIER];
527                 else
528                         events &= ~via2[vDirA];
529         } while (events);
530 }
531 
532 /*
533  * Register the interrupt dispatchers for VIA or RBV machines only.
534  */
535 
536 void __init via_register_interrupts(void)
537 {
538         if (via_alt_mapping) {
539                 /* software interrupt */
540                 irq_set_chained_handler(IRQ_AUTO_1, via1_irq);
541                 /* via1 interrupt */
542                 irq_set_chained_handler(IRQ_AUTO_6, via1_irq);
543         } else {
544                 irq_set_chained_handler(IRQ_AUTO_1, via1_irq);
545         }
546         irq_set_chained_handler(IRQ_AUTO_2, via2_irq);
547         irq_set_chained_handler(IRQ_MAC_NUBUS, via_nubus_irq);
548 }
549 
550 void via_irq_enable(int irq) {
551         int irq_src     = IRQ_SRC(irq);
552         int irq_idx     = IRQ_IDX(irq);
553 
554         if (irq_src == 1) {
555                 via1[vIER] = IER_SET_BIT(irq_idx);
556         } else if (irq_src == 2) {
557                 if (irq != IRQ_MAC_NUBUS || nubus_disabled == 0)
558                         via2[gIER] = IER_SET_BIT(irq_idx);
559         } else if (irq_src == 7) {
560                 switch (macintosh_config->via_type) {
561                 case MAC_VIA_II:
562                 case MAC_VIA_QUADRA:
563                         nubus_disabled &= ~(1 << irq_idx);
564                         /* Enable the CA1 interrupt when no slot is disabled. */
565                         if (!nubus_disabled)
566                                 via2[gIER] = IER_SET_BIT(1);
567                         break;
568                 case MAC_VIA_IICI:
569                         /* On RBV, enable the slot interrupt.
570                          * SIER works like IER.
571                          */
572                         via2[rSIER] = IER_SET_BIT(irq_idx);
573                         break;
574                 }
575         }
576 }
577 
578 void via_irq_disable(int irq) {
579         int irq_src     = IRQ_SRC(irq);
580         int irq_idx     = IRQ_IDX(irq);
581 
582         if (irq_src == 1) {
583                 via1[vIER] = IER_CLR_BIT(irq_idx);
584         } else if (irq_src == 2) {
585                 via2[gIER] = IER_CLR_BIT(irq_idx);
586         } else if (irq_src == 7) {
587                 switch (macintosh_config->via_type) {
588                 case MAC_VIA_II:
589                 case MAC_VIA_QUADRA:
590                         nubus_disabled |= 1 << irq_idx;
591                         if (nubus_disabled)
592                                 via2[gIER] = IER_CLR_BIT(1);
593                         break;
594                 case MAC_VIA_IICI:
595                         via2[rSIER] = IER_CLR_BIT(irq_idx);
596                         break;
597                 }
598         }
599 }
600 
601 void via1_set_head(int head)
602 {
603         if (head == 0)
604                 via1[vBufA] &= ~VIA1A_vHeadSel;
605         else
606                 via1[vBufA] |= VIA1A_vHeadSel;
607 }
608 EXPORT_SYMBOL(via1_set_head);
609 
610 int via2_scsi_drq_pending(void)
611 {
612         return via2[gIFR] & (1 << IRQ_IDX(IRQ_MAC_SCSIDRQ));
613 }
614 EXPORT_SYMBOL(via2_scsi_drq_pending);
615 

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