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Linux 5.7.6
[linux/fpc-iii.git] / arch / mips / sgi-ip32 / ip32-irq.c
blob1bbd5bfb545835773b806c4923d5a578ace01f1e
1 /*
2 * Code to handle IP32 IRQs
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * Copyright (C) 2000 Harald Koerfgen
9 * Copyright (C) 2001 Keith M Wesolowski
10 */
11 #include <linux/init.h>
12 #include <linux/kernel_stat.h>
13 #include <linux/types.h>
14 #include <linux/interrupt.h>
15 #include <linux/irq.h>
16 #include <linux/bitops.h>
17 #include <linux/kernel.h>
18 #include <linux/mm.h>
19 #include <linux/random.h>
20 #include <linux/sched.h>
21 #include <linux/sched/debug.h>
22
23 #include <asm/irq_cpu.h>
24 #include <asm/mipsregs.h>
25 #include <asm/signal.h>
26 #include <asm/time.h>
27 #include <asm/ip32/crime.h>
28 #include <asm/ip32/mace.h>
29 #include <asm/ip32/ip32_ints.h>
30
31 /* issue a PIO read to make sure no PIO writes are pending */
32 static inline void flush_crime_bus(void)
33 {
34 crime->control;
35 }
36
37 static inline void flush_mace_bus(void)
38 {
39 mace->perif.ctrl.misc;
40 }
41
42 /*
43 * O2 irq map
44 *
45 * IP0 -> software (ignored)
46 * IP1 -> software (ignored)
47 * IP2 -> (irq0) C crime 1.1 all interrupts; crime 1.5 ???
48 * IP3 -> (irq1) X unknown
49 * IP4 -> (irq2) X unknown
50 * IP5 -> (irq3) X unknown
51 * IP6 -> (irq4) X unknown
52 * IP7 -> (irq5) 7 CPU count/compare timer (system timer)
53 *
54 * crime: (C)
55 *
56 * CRIME_INT_STAT 31:0:
57 *
58 * 0 -> 8 Video in 1
59 * 1 -> 9 Video in 2
60 * 2 -> 10 Video out
61 * 3 -> 11 Mace ethernet
62 * 4 -> S SuperIO sub-interrupt
63 * 5 -> M Miscellaneous sub-interrupt
64 * 6 -> A Audio sub-interrupt
65 * 7 -> 15 PCI bridge errors
66 * 8 -> 16 PCI SCSI aic7xxx 0
67 * 9 -> 17 PCI SCSI aic7xxx 1
68 * 10 -> 18 PCI slot 0
69 * 11 -> 19 unused (PCI slot 1)
70 * 12 -> 20 unused (PCI slot 2)
71 * 13 -> 21 unused (PCI shared 0)
72 * 14 -> 22 unused (PCI shared 1)
73 * 15 -> 23 unused (PCI shared 2)
74 * 16 -> 24 GBE0 (E)
75 * 17 -> 25 GBE1 (E)
76 * 18 -> 26 GBE2 (E)
77 * 19 -> 27 GBE3 (E)
78 * 20 -> 28 CPU errors
79 * 21 -> 29 Memory errors
80 * 22 -> 30 RE empty edge (E)
81 * 23 -> 31 RE full edge (E)
82 * 24 -> 32 RE idle edge (E)
83 * 25 -> 33 RE empty level
84 * 26 -> 34 RE full level
85 * 27 -> 35 RE idle level
86 * 28 -> 36 unused (software 0) (E)
87 * 29 -> 37 unused (software 1) (E)
88 * 30 -> 38 unused (software 2) - crime 1.5 CPU SysCorError (E)
89 * 31 -> 39 VICE
90 *
91 * S, M, A: Use the MACE ISA interrupt register
92 * MACE_ISA_INT_STAT 31:0
93 *
94 * 0-7 -> 40-47 Audio
95 * 8 -> 48 RTC
96 * 9 -> 49 Keyboard
97 * 10 -> X Keyboard polled
98 * 11 -> 51 Mouse
99 * 12 -> X Mouse polled
100 * 13-15 -> 53-55 Count/compare timers
101 * 16-19 -> 56-59 Parallel (16 E)
102 * 20-25 -> 60-62 Serial 1 (22 E)
103 * 26-31 -> 66-71 Serial 2 (28 E)
104 *
105 * Note that this means IRQs 12-14, 50, and 52 do not exist. This is a
106 * different IRQ map than IRIX uses, but that's OK as Linux irq handling
107 * is quite different anyway.
108 */
109
110 /* Some initial interrupts to set up */
111 extern irqreturn_t crime_memerr_intr(int irq, void *dev_id);
112 extern irqreturn_t crime_cpuerr_intr(int irq, void *dev_id);
113
114 /*
115 * This is for pure CRIME interrupts - ie not MACE. The advantage?
116 * We get to split the register in half and do faster lookups.
117 */
118
119 static uint64_t crime_mask;
120
121 static inline void crime_enable_irq(struct irq_data *d)
122 {
123 unsigned int bit = d->irq - CRIME_IRQ_BASE;
124
125 crime_mask |= 1 << bit;
126 crime->imask = crime_mask;
127 }
128
129 static inline void crime_disable_irq(struct irq_data *d)
130 {
131 unsigned int bit = d->irq - CRIME_IRQ_BASE;
132
133 crime_mask &= ~(1 << bit);
134 crime->imask = crime_mask;
135 flush_crime_bus();
136 }
137
138 static struct irq_chip crime_level_interrupt = {
139 .name = "IP32 CRIME",
140 .irq_mask = crime_disable_irq,
141 .irq_unmask = crime_enable_irq,
142 };
143
144 static void crime_edge_mask_and_ack_irq(struct irq_data *d)
145 {
146 unsigned int bit = d->irq - CRIME_IRQ_BASE;
147 uint64_t crime_int;
148
149 /* Edge triggered interrupts must be cleared. */
150 crime_int = crime->hard_int;
151 crime_int &= ~(1 << bit);
152 crime->hard_int = crime_int;
153
154 crime_disable_irq(d);
155 }
156
157 static struct irq_chip crime_edge_interrupt = {
158 .name = "IP32 CRIME",
159 .irq_ack = crime_edge_mask_and_ack_irq,
160 .irq_mask = crime_disable_irq,
161 .irq_mask_ack = crime_edge_mask_and_ack_irq,
162 .irq_unmask = crime_enable_irq,
163 };
164
165 /*
166 * This is for MACE PCI interrupts. We can decrease bus traffic by masking
167 * as close to the source as possible. This also means we can take the
168 * next chunk of the CRIME register in one piece.
169 */
170
171 static unsigned long macepci_mask;
172
173 static void enable_macepci_irq(struct irq_data *d)
174 {
175 macepci_mask |= MACEPCI_CONTROL_INT(d->irq - MACEPCI_SCSI0_IRQ);
176 mace->pci.control = macepci_mask;
177 crime_mask |= 1 << (d->irq - CRIME_IRQ_BASE);
178 crime->imask = crime_mask;
179 }
180
181 static void disable_macepci_irq(struct irq_data *d)
182 {
183 crime_mask &= ~(1 << (d->irq - CRIME_IRQ_BASE));
184 crime->imask = crime_mask;
185 flush_crime_bus();
186 macepci_mask &= ~MACEPCI_CONTROL_INT(d->irq - MACEPCI_SCSI0_IRQ);
187 mace->pci.control = macepci_mask;
188 flush_mace_bus();
189 }
190
191 static struct irq_chip ip32_macepci_interrupt = {
192 .name = "IP32 MACE PCI",
193 .irq_mask = disable_macepci_irq,
194 .irq_unmask = enable_macepci_irq,
195 };
196
197 /* This is used for MACE ISA interrupts. That means bits 4-6 in the
198 * CRIME register.
199 */
200
201 #define MACEISA_AUDIO_INT (MACEISA_AUDIO_SW_INT | \
202 MACEISA_AUDIO_SC_INT | \
203 MACEISA_AUDIO1_DMAT_INT | \
204 MACEISA_AUDIO1_OF_INT | \
205 MACEISA_AUDIO2_DMAT_INT | \
206 MACEISA_AUDIO2_MERR_INT | \
207 MACEISA_AUDIO3_DMAT_INT | \
208 MACEISA_AUDIO3_MERR_INT)
209 #define MACEISA_MISC_INT (MACEISA_RTC_INT | \
210 MACEISA_KEYB_INT | \
211 MACEISA_KEYB_POLL_INT | \
212 MACEISA_MOUSE_INT | \
213 MACEISA_MOUSE_POLL_INT | \
214 MACEISA_TIMER0_INT | \
215 MACEISA_TIMER1_INT | \
216 MACEISA_TIMER2_INT)
217 #define MACEISA_SUPERIO_INT (MACEISA_PARALLEL_INT | \
218 MACEISA_PAR_CTXA_INT | \
219 MACEISA_PAR_CTXB_INT | \
220 MACEISA_PAR_MERR_INT | \
221 MACEISA_SERIAL1_INT | \
222 MACEISA_SERIAL1_TDMAT_INT | \
223 MACEISA_SERIAL1_TDMAPR_INT | \
224 MACEISA_SERIAL1_TDMAME_INT | \
225 MACEISA_SERIAL1_RDMAT_INT | \
226 MACEISA_SERIAL1_RDMAOR_INT | \
227 MACEISA_SERIAL2_INT | \
228 MACEISA_SERIAL2_TDMAT_INT | \
229 MACEISA_SERIAL2_TDMAPR_INT | \
230 MACEISA_SERIAL2_TDMAME_INT | \
231 MACEISA_SERIAL2_RDMAT_INT | \
232 MACEISA_SERIAL2_RDMAOR_INT)
233
234 static unsigned long maceisa_mask;
235
236 static void enable_maceisa_irq(struct irq_data *d)
237 {
238 unsigned int crime_int = 0;
239
240 pr_debug("maceisa enable: %u\n", d->irq);
241
242 switch (d->irq) {
243 case MACEISA_AUDIO_SW_IRQ ... MACEISA_AUDIO3_MERR_IRQ:
244 crime_int = MACE_AUDIO_INT;
245 break;
246 case MACEISA_RTC_IRQ ... MACEISA_TIMER2_IRQ:
247 crime_int = MACE_MISC_INT;
248 break;
249 case MACEISA_PARALLEL_IRQ ... MACEISA_SERIAL2_RDMAOR_IRQ:
250 crime_int = MACE_SUPERIO_INT;
251 break;
252 }
253 pr_debug("crime_int %08x enabled\n", crime_int);
254 crime_mask |= crime_int;
255 crime->imask = crime_mask;
256 maceisa_mask |= 1 << (d->irq - MACEISA_AUDIO_SW_IRQ);
257 mace->perif.ctrl.imask = maceisa_mask;
258 }
259
260 static void disable_maceisa_irq(struct irq_data *d)
261 {
262 unsigned int crime_int = 0;
263
264 maceisa_mask &= ~(1 << (d->irq - MACEISA_AUDIO_SW_IRQ));
265 if (!(maceisa_mask & MACEISA_AUDIO_INT))
266 crime_int |= MACE_AUDIO_INT;
267 if (!(maceisa_mask & MACEISA_MISC_INT))
268 crime_int |= MACE_MISC_INT;
269 if (!(maceisa_mask & MACEISA_SUPERIO_INT))
270 crime_int |= MACE_SUPERIO_INT;
271 crime_mask &= ~crime_int;
272 crime->imask = crime_mask;
273 flush_crime_bus();
274 mace->perif.ctrl.imask = maceisa_mask;
275 flush_mace_bus();
276 }
277
278 static void mask_and_ack_maceisa_irq(struct irq_data *d)
279 {
280 unsigned long mace_int;
281
282 /* edge triggered */
283 mace_int = mace->perif.ctrl.istat;
284 mace_int &= ~(1 << (d->irq - MACEISA_AUDIO_SW_IRQ));
285 mace->perif.ctrl.istat = mace_int;
286
287 disable_maceisa_irq(d);
288 }
289
290 static struct irq_chip ip32_maceisa_level_interrupt = {
291 .name = "IP32 MACE ISA",
292 .irq_mask = disable_maceisa_irq,
293 .irq_unmask = enable_maceisa_irq,
294 };
295
296 static struct irq_chip ip32_maceisa_edge_interrupt = {
297 .name = "IP32 MACE ISA",
298 .irq_ack = mask_and_ack_maceisa_irq,
299 .irq_mask = disable_maceisa_irq,
300 .irq_mask_ack = mask_and_ack_maceisa_irq,
301 .irq_unmask = enable_maceisa_irq,
302 };
303
304 /* This is used for regular non-ISA, non-PCI MACE interrupts. That means
305 * bits 0-3 and 7 in the CRIME register.
306 */
307
308 static void enable_mace_irq(struct irq_data *d)
309 {
310 unsigned int bit = d->irq - CRIME_IRQ_BASE;
311
312 crime_mask |= (1 << bit);
313 crime->imask = crime_mask;
314 }
315
316 static void disable_mace_irq(struct irq_data *d)
317 {
318 unsigned int bit = d->irq - CRIME_IRQ_BASE;
319
320 crime_mask &= ~(1 << bit);
321 crime->imask = crime_mask;
322 flush_crime_bus();
323 }
324
325 static struct irq_chip ip32_mace_interrupt = {
326 .name = "IP32 MACE",
327 .irq_mask = disable_mace_irq,
328 .irq_unmask = enable_mace_irq,
329 };
330
331 static void ip32_unknown_interrupt(void)
332 {
333 printk("Unknown interrupt occurred!\n");
334 printk("cp0_status: %08x\n", read_c0_status());
335 printk("cp0_cause: %08x\n", read_c0_cause());
336 printk("CRIME intr mask: %016lx\n", crime->imask);
337 printk("CRIME intr status: %016lx\n", crime->istat);
338 printk("CRIME hardware intr register: %016lx\n", crime->hard_int);
339 printk("MACE ISA intr mask: %08lx\n", mace->perif.ctrl.imask);
340 printk("MACE ISA intr status: %08lx\n", mace->perif.ctrl.istat);
341 printk("MACE PCI control register: %08x\n", mace->pci.control);
342
343 printk("Register dump:\n");
344 show_regs(get_irq_regs());
345
346 printk("Please mail this report to linux-mips@linux-mips.org\n");
347 printk("Spinning...");
348 while(1) ;
349 }
350
351 /* CRIME 1.1 appears to deliver all interrupts to this one pin. */
352 /* change this to loop over all edge-triggered irqs, exception masked out ones */
353 static void ip32_irq0(void)
354 {
355 uint64_t crime_int;
356 int irq = 0;
357
358 /*
359 * Sanity check interrupt numbering enum.
360 * MACE got 32 interrupts and there are 32 MACE ISA interrupts daisy
361 * chained.
362 */
363 BUILD_BUG_ON(CRIME_VICE_IRQ - MACE_VID_IN1_IRQ != 31);
364 BUILD_BUG_ON(MACEISA_SERIAL2_RDMAOR_IRQ - MACEISA_AUDIO_SW_IRQ != 31);
365
366 crime_int = crime->istat & crime_mask;
367
368 /* crime sometime delivers spurious interrupts, ignore them */
369 if (unlikely(crime_int == 0))
370 return;
371
372 irq = MACE_VID_IN1_IRQ + __ffs(crime_int);
373
374 if (crime_int & CRIME_MACEISA_INT_MASK) {
375 unsigned long mace_int = mace->perif.ctrl.istat;
376 irq = __ffs(mace_int & maceisa_mask) + MACEISA_AUDIO_SW_IRQ;
377 }
378
379 pr_debug("*irq %u*\n", irq);
380 do_IRQ(irq);
381 }
382
383 static void ip32_irq1(void)
384 {
385 ip32_unknown_interrupt();
386 }
387
388 static void ip32_irq2(void)
389 {
390 ip32_unknown_interrupt();
391 }
392
393 static void ip32_irq3(void)
394 {
395 ip32_unknown_interrupt();
396 }
397
398 static void ip32_irq4(void)
399 {
400 ip32_unknown_interrupt();
401 }
402
403 static void ip32_irq5(void)
404 {
405 do_IRQ(MIPS_CPU_IRQ_BASE + 7);
406 }
407
408 asmlinkage void plat_irq_dispatch(void)
409 {
410 unsigned int pending = read_c0_status() & read_c0_cause();
411
412 if (likely(pending & IE_IRQ0))
413 ip32_irq0();
414 else if (unlikely(pending & IE_IRQ1))
415 ip32_irq1();
416 else if (unlikely(pending & IE_IRQ2))
417 ip32_irq2();
418 else if (unlikely(pending & IE_IRQ3))
419 ip32_irq3();
420 else if (unlikely(pending & IE_IRQ4))
421 ip32_irq4();
422 else if (likely(pending & IE_IRQ5))
423 ip32_irq5();
424 }
425
426 void __init arch_init_irq(void)
427 {
428 unsigned int irq;
429
430 /* Install our interrupt handler, then clear and disable all
431 * CRIME and MACE interrupts. */
432 crime->imask = 0;
433 crime->hard_int = 0;
434 crime->soft_int = 0;
435 mace->perif.ctrl.istat = 0;
436 mace->perif.ctrl.imask = 0;
437
438 mips_cpu_irq_init();
439 for (irq = CRIME_IRQ_BASE; irq <= IP32_IRQ_MAX; irq++) {
440 switch (irq) {
441 case MACE_VID_IN1_IRQ ... MACE_PCI_BRIDGE_IRQ:
442 irq_set_chip_and_handler_name(irq,
443 &ip32_mace_interrupt,
444 handle_level_irq,
445 "level");
446 break;
447
448 case MACEPCI_SCSI0_IRQ ... MACEPCI_SHARED2_IRQ:
449 irq_set_chip_and_handler_name(irq,
450 &ip32_macepci_interrupt,
451 handle_level_irq,
452 "level");
453 break;
454
455 case CRIME_CPUERR_IRQ:
456 case CRIME_MEMERR_IRQ:
457 irq_set_chip_and_handler_name(irq,
458 &crime_level_interrupt,
459 handle_level_irq,
460 "level");
461 break;
462
463 case CRIME_GBE0_IRQ ... CRIME_GBE3_IRQ:
464 case CRIME_RE_EMPTY_E_IRQ ... CRIME_RE_IDLE_E_IRQ:
465 case CRIME_SOFT0_IRQ ... CRIME_SOFT2_IRQ:
466 case CRIME_VICE_IRQ:
467 irq_set_chip_and_handler_name(irq,
468 &crime_edge_interrupt,
469 handle_edge_irq,
470 "edge");
471 break;
472
473 case MACEISA_PARALLEL_IRQ:
474 case MACEISA_SERIAL1_TDMAPR_IRQ:
475 case MACEISA_SERIAL2_TDMAPR_IRQ:
476 irq_set_chip_and_handler_name(irq,
477 &ip32_maceisa_edge_interrupt,
478 handle_edge_irq,
479 "edge");
480 break;
481
482 default:
483 irq_set_chip_and_handler_name(irq,
484 &ip32_maceisa_level_interrupt,
485 handle_level_irq,
486 "level");
487 break;
488 }
489 }
490 if (request_irq(CRIME_MEMERR_IRQ, crime_memerr_intr, 0,
491 "CRIME memory error", NULL))
492 pr_err("Failed to register CRIME memory error interrupt\n");
493 if (request_irq(CRIME_CPUERR_IRQ, crime_cpuerr_intr, 0,
494 "CRIME CPU error", NULL))
495 pr_err("Failed to register CRIME CPU error interrupt\n");
496
497 #define ALLINTS (IE_IRQ0 | IE_IRQ1 | IE_IRQ2 | IE_IRQ3 | IE_IRQ4 | IE_IRQ5)
498 change_c0_status(ST0_IM, ALLINTS);
499 }
Linux with added FPC-III support