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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 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070029 * Levels 3-6 vary by machine type. For VIA or RBV Macintoshes:
30 *
31 * 3 - unused (?)
32 *
Finn Thain80614e52009-11-17 20:06:48 +110033 * 4 - SCC
Linus Torvalds1da177e2005-04-16 15:20:36 -070034 *
35 * 5 - unused (?)
36 * [serial errors or special conditions seem to raise level 6
37 * interrupts on some models (LC4xx?)]
38 *
39 * 6 - off switch (?)
40 *
Finn Thain8d9f0142011-10-24 01:11:16 +110041 * Machines with Quadra-like VIA hardware, except PSC and PMU machines, support
42 * an alternate interrupt mapping, as used by A/UX. It spreads ethernet and
43 * sound out to their own autovector IRQs and gives VIA1 a higher priority:
44 *
45 * 1 - unused (?)
46 *
47 * 3 - on-board SONIC
48 *
49 * 5 - Apple Sound Chip (ASC)
50 *
51 * 6 - VIA1
52 *
Finn Thainda3fb3c2011-10-24 01:11:18 +110053 * For OSS Macintoshes (IIfx only), we apply an interrupt mapping similar to
54 * the Quadra (A/UX) mapping:
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 *
Finn Thainda3fb3c2011-10-24 01:11:18 +110056 * 1 - ISM IOP (ADB)
57 *
58 * 2 - SCSI
59 *
60 * 3 - NuBus
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 *
62 * 4 - SCC IOP
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 *
Finn Thainda3fb3c2011-10-24 01:11:18 +110064 * 6 - VIA1
Linus Torvalds1da177e2005-04-16 15:20:36 -070065 *
66 * For PSC Macintoshes (660AV, 840AV):
67 *
68 * 3 - PSC level 3
69 * - slot 0: MACE
70 *
71 * 4 - PSC level 4
72 * - slot 1: SCC channel A interrupt
73 * - slot 2: SCC channel B interrupt
74 * - slot 3: MACE DMA
75 *
76 * 5 - PSC level 5
77 *
78 * 6 - PSC level 6
79 *
80 * Finally we have good 'ole level 7, the non-maskable interrupt:
81 *
82 * 7 - NMI (programmer's switch on the back of some Macs)
83 * Also RAM parity error on models which support it (IIc, IIfx?)
84 *
85 * The current interrupt logic looks something like this:
86 *
87 * - We install dispatchers for the autovector interrupts (1-7). These
88 * dispatchers are responsible for querying the hardware (the
89 * VIA/RBV/OSS/PSC chips) to determine the actual interrupt source. Using
90 * this information a machspec interrupt number is generated by placing the
91 * index of the interrupt hardware into the low three bits and the original
92 * autovector interrupt number in the upper 5 bits. The handlers for the
93 * resulting machspec interrupt are then called.
94 *
95 * - Nubus is a special case because its interrupts are hidden behind two
96 * layers of hardware. Nubus interrupts come in as index 1 on VIA #2,
97 * which translates to IRQ number 17. In this spot we install _another_
98 * dispatcher. This dispatcher finds the interrupting slot number (9-F) and
99 * then forms a new machspec interrupt number as above with the slot number
100 * minus 9 in the low three bits and the pseudo-level 7 in the upper five
101 * bits. The handlers for this new machspec interrupt number are then
102 * called. This puts Nubus interrupts into the range 56-62.
103 *
104 * - The Baboon interrupts (used on some PowerBooks) are an even more special
105 * case. They're hidden behind the Nubus slot $C interrupt thus adding a
106 * third layer of indirection. Why oh why did the Apple engineers do that?
107 *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 */
109
110#include <linux/types.h>
111#include <linux/kernel.h>
112#include <linux/sched.h>
Finn Thained04c972011-10-24 01:11:15 +1100113#include <linux/interrupt.h>
114#include <linux/irq.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115#include <linux/delay.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117#include <asm/irq.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118#include <asm/macintosh.h>
Finn Thained04c972011-10-24 01:11:15 +1100119#include <asm/macints.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120#include <asm/mac_via.h>
121#include <asm/mac_psc.h>
Geert Uytterhoevenc85627f2008-12-21 12:03:37 +0100122#include <asm/mac_oss.h>
Finn Thained04c972011-10-24 01:11:15 +1100123#include <asm/mac_iop.h>
124#include <asm/mac_baboon.h>
125#include <asm/hwtest.h>
126#include <asm/irq_regs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128#define SHUTUP_SONIC
129
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 * console_loglevel determines NMI handler function
132 */
133
Al Viro2850bc22006-10-07 14:16:45 +0100134irqreturn_t mac_nmi_handler(int, void *);
135irqreturn_t mac_debug_handler(int, void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
137/* #define DEBUG_MACINTS */
138
Finn Thainc4af5da2011-10-24 01:11:17 +1100139static unsigned int mac_irq_startup(struct irq_data *);
140static void mac_irq_shutdown(struct irq_data *);
141
Geert Uytterhoevenc288bf22011-04-13 22:31:28 +0200142static struct irq_chip mac_irq_chip = {
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700143 .name = "mac",
Geert Uytterhoevene8abf5e2011-04-17 22:53:04 +0200144 .irq_enable = mac_irq_enable,
145 .irq_disable = mac_irq_disable,
Finn Thainc4af5da2011-10-24 01:11:17 +1100146 .irq_startup = mac_irq_startup,
147 .irq_shutdown = mac_irq_shutdown,
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700148};
149
Al Viro66a3f822007-07-20 04:33:28 +0100150void __init mac_init_IRQ(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152#ifdef DEBUG_MACINTS
153 printk("mac_init_IRQ(): Setting things up...\n");
154#endif
Geert Uytterhoevenedb34722011-06-01 11:15:21 +0200155 m68k_setup_irq_controller(&mac_irq_chip, handle_simple_irq, IRQ_USER,
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700156 NUM_MAC_SOURCES - IRQ_USER);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 /* Make sure the SONIC interrupt is cleared or things get ugly */
158#ifdef SHUTUP_SONIC
159 printk("Killing onboard sonic... ");
160 /* This address should hopefully be mapped already */
161 if (hwreg_present((void*)(0x50f0a000))) {
162 *(long *)(0x50f0a014) = 0x7fffL;
163 *(long *)(0x50f0a010) = 0L;
164 }
165 printk("Done.\n");
166#endif /* SHUTUP_SONIC */
167
168 /*
169 * Now register the handlers for the master IRQ handlers
170 * at levels 1-7. Most of the work is done elsewhere.
171 */
172
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700173 if (oss_present)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 oss_register_interrupts();
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700175 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 via_register_interrupts();
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700177 if (psc_present)
178 psc_register_interrupts();
179 if (baboon_present)
180 baboon_register_interrupts();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181 iop_register_interrupts();
Geert Uytterhoeven92c3dd12008-12-30 14:02:27 +0100182 if (request_irq(IRQ_AUTO_7, mac_nmi_handler, 0, "NMI",
183 mac_nmi_handler))
184 pr_err("Couldn't register NMI\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185#ifdef DEBUG_MACINTS
186 printk("mac_init_IRQ(): Done!\n");
187#endif
188}
189
190/*
Finn Thain2690e212011-09-11 23:40:50 +1000191 * mac_irq_enable - enable an interrupt source
192 * mac_irq_disable - disable an interrupt source
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 *
194 * These routines are just dispatchers to the VIA/OSS/PSC routines.
195 */
196
Finn Thain2690e212011-09-11 23:40:50 +1000197void mac_irq_enable(struct irq_data *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198{
Finn Thain2690e212011-09-11 23:40:50 +1000199 int irq = data->irq;
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700200 int irq_src = IRQ_SRC(irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201
202 switch(irq_src) {
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700203 case 1:
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700204 case 2:
205 case 7:
206 if (oss_present)
207 oss_irq_enable(irq);
208 else
209 via_irq_enable(irq);
210 break;
211 case 3:
Finn Thainda3fb3c2011-10-24 01:11:18 +1100212 case 4:
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700213 case 5:
214 case 6:
215 if (psc_present)
216 psc_irq_enable(irq);
217 else if (oss_present)
218 oss_irq_enable(irq);
Finn Thain80614e52009-11-17 20:06:48 +1100219 break;
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700220 case 8:
221 if (baboon_present)
222 baboon_irq_enable(irq);
223 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 }
225}
226
Finn Thain2690e212011-09-11 23:40:50 +1000227void mac_irq_disable(struct irq_data *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228{
Finn Thain2690e212011-09-11 23:40:50 +1000229 int irq = data->irq;
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700230 int irq_src = IRQ_SRC(irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231
232 switch(irq_src) {
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700233 case 1:
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700234 case 2:
235 case 7:
236 if (oss_present)
237 oss_irq_disable(irq);
238 else
239 via_irq_disable(irq);
240 break;
241 case 3:
Finn Thainda3fb3c2011-10-24 01:11:18 +1100242 case 4:
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700243 case 5:
244 case 6:
245 if (psc_present)
246 psc_irq_disable(irq);
247 else if (oss_present)
248 oss_irq_disable(irq);
Finn Thain80614e52009-11-17 20:06:48 +1100249 break;
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700250 case 8:
251 if (baboon_present)
252 baboon_irq_disable(irq);
253 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 }
255}
256
Finn Thainc4af5da2011-10-24 01:11:17 +1100257static unsigned int mac_irq_startup(struct irq_data *data)
258{
259 int irq = data->irq;
260
261 if (IRQ_SRC(irq) == 7 && !oss_present)
262 via_nubus_irq_startup(irq);
263 else
264 mac_irq_enable(data);
265
266 return 0;
267}
268
269static void mac_irq_shutdown(struct irq_data *data)
270{
271 int irq = data->irq;
272
273 if (IRQ_SRC(irq) == 7 && !oss_present)
274 via_nubus_irq_shutdown(irq);
275 else
276 mac_irq_disable(data);
277}
278
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279static int num_debug[8];
280
Al Viro2850bc22006-10-07 14:16:45 +0100281irqreturn_t mac_debug_handler(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282{
283 if (num_debug[irq] < 10) {
284 printk("DEBUG: Unexpected IRQ %d\n", irq);
285 num_debug[irq]++;
286 }
287 return IRQ_HANDLED;
288}
289
290static int in_nmi;
291static volatile int nmi_hold;
292
Al Viro2850bc22006-10-07 14:16:45 +0100293irqreturn_t mac_nmi_handler(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294{
295 int i;
296 /*
297 * generate debug output on NMI switch if 'debug' kernel option given
298 * (only works with Penguin!)
299 */
300
301 in_nmi++;
302 for (i=0; i<100; i++)
303 udelay(1000);
304
305 if (in_nmi == 1) {
306 nmi_hold = 1;
307 printk("... pausing, press NMI to resume ...");
308 } else {
309 printk(" ok!\n");
310 nmi_hold = 0;
311 }
312
313 barrier();
314
315 while (nmi_hold == 1)
316 udelay(1000);
317
Roman Zippel9c5f4af2006-06-25 05:47:04 -0700318 if (console_loglevel >= 8) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319#if 0
Al Viro2850bc22006-10-07 14:16:45 +0100320 struct pt_regs *fp = get_irq_regs();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 show_state();
322 printk("PC: %08lx\nSR: %04x SP: %p\n", fp->pc, fp->sr, fp);
323 printk("d0: %08lx d1: %08lx d2: %08lx d3: %08lx\n",
324 fp->d0, fp->d1, fp->d2, fp->d3);
325 printk("d4: %08lx d5: %08lx a0: %08lx a1: %08lx\n",
326 fp->d4, fp->d5, fp->a0, fp->a1);
327
328 if (STACK_MAGIC != *(unsigned long *)current->kernel_stack_page)
329 printk("Corrupted stack page\n");
330 printk("Process %s (pid: %d, stackpage=%08lx)\n",
331 current->comm, current->pid, current->kernel_stack_page);
332 if (intr_count == 1)
333 dump_stack((struct frame *)fp);
334#else
335 /* printk("NMI "); */
336#endif
337 }
338 in_nmi--;
339 return IRQ_HANDLED;
340}