blob: ffa1b3f7e2b7654167c30dca8443c637c54425c4 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Macintosh interrupts
3 *
4 * General design:
5 * In contrary to the Amiga and Atari platforms, the Mac hardware seems to
6 * exclusively use the autovector interrupts (the 'generic level0-level7'
7 * interrupts with exception vectors 0x19-0x1f). The following interrupt levels
8 * are used:
9 * 1 - VIA1
10 * - slot 0: one second interrupt (CA2)
11 * - slot 1: VBlank (CA1)
12 * - slot 2: ADB data ready (SR full)
13 * - slot 3: ADB data (CB2)
14 * - slot 4: ADB clock (CB1)
15 * - slot 5: timer 2
16 * - slot 6: timer 1
17 * - slot 7: status of IRQ; signals 'any enabled int.'
18 *
19 * 2 - VIA2 or RBV
20 * - slot 0: SCSI DRQ (CA2)
21 * - slot 1: NUBUS IRQ (CA1) need to read port A to find which
22 * - slot 2: /EXP IRQ (only on IIci)
23 * - slot 3: SCSI IRQ (CB2)
24 * - slot 4: ASC IRQ (CB1)
25 * - slot 5: timer 2 (not on IIci)
26 * - slot 6: timer 1 (not on IIci)
27 * - slot 7: status of IRQ; signals 'any enabled int.'
28 *
29 * 2 - OSS (IIfx only?)
30 * - slot 0: SCSI interrupt
31 * - slot 1: Sound interrupt
32 *
33 * Levels 3-6 vary by machine type. For VIA or RBV Macintoshes:
34 *
35 * 3 - unused (?)
36 *
Finn Thain80614e52009-11-17 20:06:48 +110037 * 4 - SCC
Linus Torvalds1da177e2005-04-16 15:20:36 -070038 *
39 * 5 - unused (?)
40 * [serial errors or special conditions seem to raise level 6
41 * interrupts on some models (LC4xx?)]
42 *
43 * 6 - off switch (?)
44 *
45 * For OSS Macintoshes (IIfx only at this point):
46 *
47 * 3 - Nubus interrupt
48 * - slot 0: Slot $9
49 * - slot 1: Slot $A
50 * - slot 2: Slot $B
51 * - slot 3: Slot $C
52 * - slot 4: Slot $D
53 * - slot 5: Slot $E
54 *
55 * 4 - SCC IOP
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 *
57 * 5 - ISM IOP (ADB?)
58 *
59 * 6 - unused
60 *
61 * For PSC Macintoshes (660AV, 840AV):
62 *
63 * 3 - PSC level 3
64 * - slot 0: MACE
65 *
66 * 4 - PSC level 4
67 * - slot 1: SCC channel A interrupt
68 * - slot 2: SCC channel B interrupt
69 * - slot 3: MACE DMA
70 *
71 * 5 - PSC level 5
72 *
73 * 6 - PSC level 6
74 *
75 * Finally we have good 'ole level 7, the non-maskable interrupt:
76 *
77 * 7 - NMI (programmer's switch on the back of some Macs)
78 * Also RAM parity error on models which support it (IIc, IIfx?)
79 *
80 * The current interrupt logic looks something like this:
81 *
82 * - We install dispatchers for the autovector interrupts (1-7). These
83 * dispatchers are responsible for querying the hardware (the
84 * VIA/RBV/OSS/PSC chips) to determine the actual interrupt source. Using
85 * this information a machspec interrupt number is generated by placing the
86 * index of the interrupt hardware into the low three bits and the original
87 * autovector interrupt number in the upper 5 bits. The handlers for the
88 * resulting machspec interrupt are then called.
89 *
90 * - Nubus is a special case because its interrupts are hidden behind two
91 * layers of hardware. Nubus interrupts come in as index 1 on VIA #2,
92 * which translates to IRQ number 17. In this spot we install _another_
93 * dispatcher. This dispatcher finds the interrupting slot number (9-F) and
94 * then forms a new machspec interrupt number as above with the slot number
95 * minus 9 in the low three bits and the pseudo-level 7 in the upper five
96 * bits. The handlers for this new machspec interrupt number are then
97 * called. This puts Nubus interrupts into the range 56-62.
98 *
99 * - The Baboon interrupts (used on some PowerBooks) are an even more special
100 * case. They're hidden behind the Nubus slot $C interrupt thus adding a
101 * third layer of indirection. Why oh why did the Apple engineers do that?
102 *
103 * - We support "fast" and "slow" handlers, just like the Amiga port. The
104 * fast handlers are called first and with all interrupts disabled. They
105 * are expected to execute quickly (hence the name). The slow handlers are
106 * called last with interrupts enabled and the interrupt level restored.
107 * They must therefore be reentrant.
108 *
109 * TODO:
110 *
111 */
112
Al Viro66a3f822007-07-20 04:33:28 +0100113#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114#include <linux/types.h>
115#include <linux/kernel.h>
116#include <linux/sched.h>
117#include <linux/kernel_stat.h>
118#include <linux/interrupt.h> /* for intr_count */
119#include <linux/delay.h>
120#include <linux/seq_file.h>
121
122#include <asm/system.h>
123#include <asm/irq.h>
124#include <asm/traps.h>
125#include <asm/bootinfo.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126#include <asm/macintosh.h>
127#include <asm/mac_via.h>
128#include <asm/mac_psc.h>
129#include <asm/hwtest.h>
130#include <asm/errno.h>
131#include <asm/macints.h>
Al Viro2850bc22006-10-07 14:16:45 +0100132#include <asm/irq_regs.h>
Geert Uytterhoevenc85627f2008-12-21 12:03:37 +0100133#include <asm/mac_oss.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135#define SHUTUP_SONIC
136
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137/*
138 * VIA/RBV hooks
139 */
140
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141extern void via_register_interrupts(void);
142extern void via_irq_enable(int);
143extern void via_irq_disable(int);
144extern void via_irq_clear(int);
145extern int via_irq_pending(int);
146
147/*
148 * OSS hooks
149 */
150
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151extern void oss_register_interrupts(void);
152extern void oss_irq_enable(int);
153extern void oss_irq_disable(int);
154extern void oss_irq_clear(int);
155extern int oss_irq_pending(int);
156
157/*
158 * PSC hooks
159 */
160
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161extern void psc_register_interrupts(void);
162extern void psc_irq_enable(int);
163extern void psc_irq_disable(int);
164extern void psc_irq_clear(int);
165extern int psc_irq_pending(int);
166
167/*
168 * IOP hooks
169 */
170
171extern void iop_register_interrupts(void);
172
173/*
174 * Baboon hooks
175 */
176
177extern int baboon_present;
178
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179extern void baboon_register_interrupts(void);
180extern void baboon_irq_enable(int);
181extern void baboon_irq_disable(int);
182extern void baboon_irq_clear(int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183
184/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 * console_loglevel determines NMI handler function
186 */
187
Al Viro2850bc22006-10-07 14:16:45 +0100188irqreturn_t mac_nmi_handler(int, void *);
189irqreturn_t mac_debug_handler(int, void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190
191/* #define DEBUG_MACINTS */
192
Finn Thain746e8d32008-11-18 20:45:21 +0100193void mac_enable_irq(unsigned int irq);
194void mac_disable_irq(unsigned int irq);
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700195
Geert Uytterhoevenc288bf22011-04-13 22:31:28 +0200196static struct irq_chip mac_irq_chip = {
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700197 .name = "mac",
Geert Uytterhoevenc288bf22011-04-13 22:31:28 +0200198 .irq_enable = mac_enable_irq,
199 .irq_disable = mac_disable_irq,
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700200};
201
Al Viro66a3f822007-07-20 04:33:28 +0100202void __init mac_init_IRQ(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204#ifdef DEBUG_MACINTS
205 printk("mac_init_IRQ(): Setting things up...\n");
206#endif
Geert Uytterhoevenc288bf22011-04-13 22:31:28 +0200207 m68k_setup_irq_chip(&mac_irq_chip, IRQ_USER,
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700208 NUM_MAC_SOURCES - IRQ_USER);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 /* Make sure the SONIC interrupt is cleared or things get ugly */
210#ifdef SHUTUP_SONIC
211 printk("Killing onboard sonic... ");
212 /* This address should hopefully be mapped already */
213 if (hwreg_present((void*)(0x50f0a000))) {
214 *(long *)(0x50f0a014) = 0x7fffL;
215 *(long *)(0x50f0a010) = 0L;
216 }
217 printk("Done.\n");
218#endif /* SHUTUP_SONIC */
219
220 /*
221 * Now register the handlers for the master IRQ handlers
222 * at levels 1-7. Most of the work is done elsewhere.
223 */
224
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700225 if (oss_present)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 oss_register_interrupts();
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700227 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 via_register_interrupts();
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700229 if (psc_present)
230 psc_register_interrupts();
231 if (baboon_present)
232 baboon_register_interrupts();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 iop_register_interrupts();
Geert Uytterhoeven92c3dd12008-12-30 14:02:27 +0100234 if (request_irq(IRQ_AUTO_7, mac_nmi_handler, 0, "NMI",
235 mac_nmi_handler))
236 pr_err("Couldn't register NMI\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237#ifdef DEBUG_MACINTS
238 printk("mac_init_IRQ(): Done!\n");
239#endif
240}
241
242/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 * mac_enable_irq - enable an interrupt source
244 * mac_disable_irq - disable an interrupt source
245 * mac_clear_irq - clears a pending interrupt
246 * mac_pending_irq - Returns the pending status of an IRQ (nonzero = pending)
247 *
248 * These routines are just dispatchers to the VIA/OSS/PSC routines.
249 */
250
Finn Thain746e8d32008-11-18 20:45:21 +0100251void mac_enable_irq(unsigned int irq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252{
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700253 int irq_src = IRQ_SRC(irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254
255 switch(irq_src) {
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700256 case 1:
257 via_irq_enable(irq);
258 break;
259 case 2:
260 case 7:
261 if (oss_present)
262 oss_irq_enable(irq);
263 else
264 via_irq_enable(irq);
265 break;
266 case 3:
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700267 case 5:
268 case 6:
269 if (psc_present)
270 psc_irq_enable(irq);
271 else if (oss_present)
272 oss_irq_enable(irq);
Finn Thain80614e52009-11-17 20:06:48 +1100273 break;
274 case 4:
275 if (psc_present)
276 psc_irq_enable(irq);
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700277 break;
278 case 8:
279 if (baboon_present)
280 baboon_irq_enable(irq);
281 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 }
283}
284
Finn Thain746e8d32008-11-18 20:45:21 +0100285void mac_disable_irq(unsigned int irq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286{
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700287 int irq_src = IRQ_SRC(irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288
289 switch(irq_src) {
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700290 case 1:
291 via_irq_disable(irq);
292 break;
293 case 2:
294 case 7:
295 if (oss_present)
296 oss_irq_disable(irq);
297 else
298 via_irq_disable(irq);
299 break;
300 case 3:
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700301 case 5:
302 case 6:
303 if (psc_present)
304 psc_irq_disable(irq);
305 else if (oss_present)
306 oss_irq_disable(irq);
Finn Thain80614e52009-11-17 20:06:48 +1100307 break;
308 case 4:
309 if (psc_present)
310 psc_irq_disable(irq);
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700311 break;
312 case 8:
313 if (baboon_present)
314 baboon_irq_disable(irq);
315 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 }
317}
318
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700319void mac_clear_irq(unsigned int irq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320{
321 switch(IRQ_SRC(irq)) {
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700322 case 1:
323 via_irq_clear(irq);
324 break;
325 case 2:
326 case 7:
327 if (oss_present)
328 oss_irq_clear(irq);
329 else
330 via_irq_clear(irq);
331 break;
332 case 3:
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700333 case 5:
334 case 6:
335 if (psc_present)
336 psc_irq_clear(irq);
337 else if (oss_present)
338 oss_irq_clear(irq);
339 break;
Finn Thain80614e52009-11-17 20:06:48 +1100340 case 4:
341 if (psc_present)
342 psc_irq_clear(irq);
343 break;
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700344 case 8:
345 if (baboon_present)
346 baboon_irq_clear(irq);
347 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 }
349}
350
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700351int mac_irq_pending(unsigned int irq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352{
353 switch(IRQ_SRC(irq)) {
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700354 case 1:
355 return via_irq_pending(irq);
356 case 2:
357 case 7:
358 if (oss_present)
359 return oss_irq_pending(irq);
360 else
361 return via_irq_pending(irq);
362 case 3:
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700363 case 5:
364 case 6:
365 if (psc_present)
366 return psc_irq_pending(irq);
367 else if (oss_present)
368 return oss_irq_pending(irq);
Finn Thain80614e52009-11-17 20:06:48 +1100369 break;
370 case 4:
371 if (psc_present)
Finn Thain8b223432011-07-18 19:44:17 +1000372 return psc_irq_pending(irq);
Finn Thain80614e52009-11-17 20:06:48 +1100373 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 }
375 return 0;
376}
Al Viro66a3f822007-07-20 04:33:28 +0100377EXPORT_SYMBOL(mac_irq_pending);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379static int num_debug[8];
380
Al Viro2850bc22006-10-07 14:16:45 +0100381irqreturn_t mac_debug_handler(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382{
383 if (num_debug[irq] < 10) {
384 printk("DEBUG: Unexpected IRQ %d\n", irq);
385 num_debug[irq]++;
386 }
387 return IRQ_HANDLED;
388}
389
390static int in_nmi;
391static volatile int nmi_hold;
392
Al Viro2850bc22006-10-07 14:16:45 +0100393irqreturn_t mac_nmi_handler(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394{
395 int i;
396 /*
397 * generate debug output on NMI switch if 'debug' kernel option given
398 * (only works with Penguin!)
399 */
400
401 in_nmi++;
402 for (i=0; i<100; i++)
403 udelay(1000);
404
405 if (in_nmi == 1) {
406 nmi_hold = 1;
407 printk("... pausing, press NMI to resume ...");
408 } else {
409 printk(" ok!\n");
410 nmi_hold = 0;
411 }
412
413 barrier();
414
415 while (nmi_hold == 1)
416 udelay(1000);
417
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700418 if (console_loglevel >= 8) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419#if 0
Al Viro2850bc22006-10-07 14:16:45 +0100420 struct pt_regs *fp = get_irq_regs();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 show_state();
422 printk("PC: %08lx\nSR: %04x SP: %p\n", fp->pc, fp->sr, fp);
423 printk("d0: %08lx d1: %08lx d2: %08lx d3: %08lx\n",
424 fp->d0, fp->d1, fp->d2, fp->d3);
425 printk("d4: %08lx d5: %08lx a0: %08lx a1: %08lx\n",
426 fp->d4, fp->d5, fp->a0, fp->a1);
427
428 if (STACK_MAGIC != *(unsigned long *)current->kernel_stack_page)
429 printk("Corrupted stack page\n");
430 printk("Process %s (pid: %d, stackpage=%08lx)\n",
431 current->comm, current->pid, current->kernel_stack_page);
432 if (intr_count == 1)
433 dump_stack((struct frame *)fp);
434#else
435 /* printk("NMI "); */
436#endif
437 }
438 in_nmi--;
439 return IRQ_HANDLED;
440}