blob: 900d899f33235c32f02cc27a393d1e642f11810b [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
196static struct irq_controller mac_irq_controller = {
197 .name = "mac",
Milind Arun Choudhary241258d2007-05-06 14:50:54 -0700198 .lock = __SPIN_LOCK_UNLOCKED(mac_irq_controller.lock),
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700199 .enable = mac_enable_irq,
200 .disable = mac_disable_irq,
201};
202
Al Viro66a3f822007-07-20 04:33:28 +0100203void __init mac_init_IRQ(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205#ifdef DEBUG_MACINTS
206 printk("mac_init_IRQ(): Setting things up...\n");
207#endif
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700208 m68k_setup_irq_controller(&mac_irq_controller, IRQ_USER,
209 NUM_MAC_SOURCES - IRQ_USER);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 /* Make sure the SONIC interrupt is cleared or things get ugly */
211#ifdef SHUTUP_SONIC
212 printk("Killing onboard sonic... ");
213 /* This address should hopefully be mapped already */
214 if (hwreg_present((void*)(0x50f0a000))) {
215 *(long *)(0x50f0a014) = 0x7fffL;
216 *(long *)(0x50f0a010) = 0L;
217 }
218 printk("Done.\n");
219#endif /* SHUTUP_SONIC */
220
221 /*
222 * Now register the handlers for the master IRQ handlers
223 * at levels 1-7. Most of the work is done elsewhere.
224 */
225
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700226 if (oss_present)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 oss_register_interrupts();
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700228 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 via_register_interrupts();
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700230 if (psc_present)
231 psc_register_interrupts();
232 if (baboon_present)
233 baboon_register_interrupts();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 iop_register_interrupts();
Geert Uytterhoeven92c3dd12008-12-30 14:02:27 +0100235 if (request_irq(IRQ_AUTO_7, mac_nmi_handler, 0, "NMI",
236 mac_nmi_handler))
237 pr_err("Couldn't register NMI\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238#ifdef DEBUG_MACINTS
239 printk("mac_init_IRQ(): Done!\n");
240#endif
241}
242
243/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 * mac_enable_irq - enable an interrupt source
245 * mac_disable_irq - disable an interrupt source
246 * mac_clear_irq - clears a pending interrupt
247 * mac_pending_irq - Returns the pending status of an IRQ (nonzero = pending)
248 *
249 * These routines are just dispatchers to the VIA/OSS/PSC routines.
250 */
251
Finn Thain746e8d32008-11-18 20:45:21 +0100252void mac_enable_irq(unsigned int irq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253{
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700254 int irq_src = IRQ_SRC(irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255
256 switch(irq_src) {
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700257 case 1:
258 via_irq_enable(irq);
259 break;
260 case 2:
261 case 7:
262 if (oss_present)
263 oss_irq_enable(irq);
264 else
265 via_irq_enable(irq);
266 break;
267 case 3:
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700268 case 5:
269 case 6:
270 if (psc_present)
271 psc_irq_enable(irq);
272 else if (oss_present)
273 oss_irq_enable(irq);
Finn Thain80614e52009-11-17 20:06:48 +1100274 break;
275 case 4:
276 if (psc_present)
277 psc_irq_enable(irq);
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700278 break;
279 case 8:
280 if (baboon_present)
281 baboon_irq_enable(irq);
282 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 }
284}
285
Finn Thain746e8d32008-11-18 20:45:21 +0100286void mac_disable_irq(unsigned int irq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287{
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700288 int irq_src = IRQ_SRC(irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289
290 switch(irq_src) {
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700291 case 1:
292 via_irq_disable(irq);
293 break;
294 case 2:
295 case 7:
296 if (oss_present)
297 oss_irq_disable(irq);
298 else
299 via_irq_disable(irq);
300 break;
301 case 3:
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700302 case 5:
303 case 6:
304 if (psc_present)
305 psc_irq_disable(irq);
306 else if (oss_present)
307 oss_irq_disable(irq);
Finn Thain80614e52009-11-17 20:06:48 +1100308 break;
309 case 4:
310 if (psc_present)
311 psc_irq_disable(irq);
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700312 break;
313 case 8:
314 if (baboon_present)
315 baboon_irq_disable(irq);
316 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 }
318}
319
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700320void mac_clear_irq(unsigned int irq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321{
322 switch(IRQ_SRC(irq)) {
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700323 case 1:
324 via_irq_clear(irq);
325 break;
326 case 2:
327 case 7:
328 if (oss_present)
329 oss_irq_clear(irq);
330 else
331 via_irq_clear(irq);
332 break;
333 case 3:
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700334 case 5:
335 case 6:
336 if (psc_present)
337 psc_irq_clear(irq);
338 else if (oss_present)
339 oss_irq_clear(irq);
340 break;
Finn Thain80614e52009-11-17 20:06:48 +1100341 case 4:
342 if (psc_present)
343 psc_irq_clear(irq);
344 break;
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700345 case 8:
346 if (baboon_present)
347 baboon_irq_clear(irq);
348 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 }
350}
351
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700352int mac_irq_pending(unsigned int irq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353{
354 switch(IRQ_SRC(irq)) {
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700355 case 1:
356 return via_irq_pending(irq);
357 case 2:
358 case 7:
359 if (oss_present)
360 return oss_irq_pending(irq);
361 else
362 return via_irq_pending(irq);
363 case 3:
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700364 case 5:
365 case 6:
366 if (psc_present)
367 return psc_irq_pending(irq);
368 else if (oss_present)
369 return oss_irq_pending(irq);
Finn Thain80614e52009-11-17 20:06:48 +1100370 break;
371 case 4:
372 if (psc_present)
373 psc_irq_pending(irq);
374 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 }
376 return 0;
377}
Al Viro66a3f822007-07-20 04:33:28 +0100378EXPORT_SYMBOL(mac_irq_pending);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380static int num_debug[8];
381
Al Viro2850bc22006-10-07 14:16:45 +0100382irqreturn_t mac_debug_handler(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383{
384 if (num_debug[irq] < 10) {
385 printk("DEBUG: Unexpected IRQ %d\n", irq);
386 num_debug[irq]++;
387 }
388 return IRQ_HANDLED;
389}
390
391static int in_nmi;
392static volatile int nmi_hold;
393
Al Viro2850bc22006-10-07 14:16:45 +0100394irqreturn_t mac_nmi_handler(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395{
396 int i;
397 /*
398 * generate debug output on NMI switch if 'debug' kernel option given
399 * (only works with Penguin!)
400 */
401
402 in_nmi++;
403 for (i=0; i<100; i++)
404 udelay(1000);
405
406 if (in_nmi == 1) {
407 nmi_hold = 1;
408 printk("... pausing, press NMI to resume ...");
409 } else {
410 printk(" ok!\n");
411 nmi_hold = 0;
412 }
413
414 barrier();
415
416 while (nmi_hold == 1)
417 udelay(1000);
418
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700419 if (console_loglevel >= 8) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420#if 0
Al Viro2850bc22006-10-07 14:16:45 +0100421 struct pt_regs *fp = get_irq_regs();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 show_state();
423 printk("PC: %08lx\nSR: %04x SP: %p\n", fp->pc, fp->sr, fp);
424 printk("d0: %08lx d1: %08lx d2: %08lx d3: %08lx\n",
425 fp->d0, fp->d1, fp->d2, fp->d3);
426 printk("d4: %08lx d5: %08lx a0: %08lx a1: %08lx\n",
427 fp->d4, fp->d5, fp->a0, fp->a1);
428
429 if (STACK_MAGIC != *(unsigned long *)current->kernel_stack_page)
430 printk("Corrupted stack page\n");
431 printk("Process %s (pid: %d, stackpage=%08lx)\n",
432 current->comm, current->pid, current->kernel_stack_page);
433 if (intr_count == 1)
434 dump_stack((struct frame *)fp);
435#else
436 /* printk("NMI "); */
437#endif
438 }
439 in_nmi--;
440 return IRQ_HANDLED;
441}