2 * Code to handle IP32 IRQs
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
8 * Copyright (C) 2000 Harald Koerfgen
9 * Copyright (C) 2001 Keith M Wesolowski
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/slab.h>
20 #include <linux/random.h>
21 #include <linux/sched.h>
23 #include <asm/irq_cpu.h>
24 #include <asm/mipsregs.h>
25 #include <asm/signal.h>
26 #include <asm/system.h>
28 #include <asm/ip32/crime.h>
29 #include <asm/ip32/mace.h>
30 #include <asm/ip32/ip32_ints.h>
32 /* issue a PIO read to make sure no PIO writes are pending */
33 static void inline flush_crime_bus(void)
38 static void inline flush_mace_bus(void)
40 mace->perif.ctrl.misc;
46 * IP0 -> software (ignored)
47 * IP1 -> software (ignored)
48 * IP2 -> (irq0) C crime 1.1 all interrupts; crime 1.5 ???
49 * IP3 -> (irq1) X unknown
50 * IP4 -> (irq2) X unknown
51 * IP5 -> (irq3) X unknown
52 * IP6 -> (irq4) X unknown
53 * IP7 -> (irq5) 7 CPU count/compare timer (system timer)
57 * CRIME_INT_STAT 31:0:
62 * 3 -> 11 Mace ethernet
63 * 4 -> S SuperIO sub-interrupt
64 * 5 -> M Miscellaneous sub-interrupt
65 * 6 -> A Audio sub-interrupt
66 * 7 -> 15 PCI bridge errors
67 * 8 -> 16 PCI SCSI aic7xxx 0
68 * 9 -> 17 PCI SCSI aic7xxx 1
70 * 11 -> 19 unused (PCI slot 1)
71 * 12 -> 20 unused (PCI slot 2)
72 * 13 -> 21 unused (PCI shared 0)
73 * 14 -> 22 unused (PCI shared 1)
74 * 15 -> 23 unused (PCI shared 2)
80 * 21 -> 29 Memory errors
81 * 22 -> 30 RE empty edge (E)
82 * 23 -> 31 RE full edge (E)
83 * 24 -> 32 RE idle edge (E)
84 * 25 -> 33 RE empty level
85 * 26 -> 34 RE full level
86 * 27 -> 35 RE idle level
87 * 28 -> 36 unused (software 0) (E)
88 * 29 -> 37 unused (software 1) (E)
89 * 30 -> 38 unused (software 2) - crime 1.5 CPU SysCorError (E)
92 * S, M, A: Use the MACE ISA interrupt register
93 * MACE_ISA_INT_STAT 31:0
98 * 10 -> X Keyboard polled
100 * 12 -> X Mouse polled
101 * 13-15 -> 53-55 Count/compare timers
102 * 16-19 -> 56-59 Parallel (16 E)
103 * 20-25 -> 60-62 Serial 1 (22 E)
104 * 26-31 -> 66-71 Serial 2 (28 E)
106 * Note that this means IRQs 12-14, 50, and 52 do not exist. This is a
107 * different IRQ map than IRIX uses, but that's OK as Linux irq handling
108 * is quite different anyway.
111 /* Some initial interrupts to set up */
112 extern irqreturn_t crime_memerr_intr(int irq, void *dev_id);
113 extern irqreturn_t crime_cpuerr_intr(int irq, void *dev_id);
115 struct irqaction memerr_irq = {
116 .handler = crime_memerr_intr,
117 .flags = IRQF_DISABLED,
118 .mask = CPU_MASK_NONE,
119 .name = "CRIME memory error",
122 struct irqaction cpuerr_irq = {
123 .handler = crime_cpuerr_intr,
124 .flags = IRQF_DISABLED,
125 .mask = CPU_MASK_NONE,
126 .name = "CRIME CPU error",
130 * This is for pure CRIME interrupts - ie not MACE. The advantage?
131 * We get to split the register in half and do faster lookups.
134 static uint64_t crime_mask;
136 static inline void crime_enable_irq(unsigned int irq)
138 unsigned int bit = irq - CRIME_IRQ_BASE;
140 crime_mask |= 1 << bit;
141 crime->imask = crime_mask;
144 static inline void crime_disable_irq(unsigned int irq)
146 unsigned int bit = irq - CRIME_IRQ_BASE;
148 crime_mask &= ~(1 << bit);
149 crime->imask = crime_mask;
153 static void crime_level_mask_and_ack_irq(unsigned int irq)
155 crime_disable_irq(irq);
158 static void crime_level_end_irq(unsigned int irq)
160 if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
161 crime_enable_irq(irq);
164 static struct irq_chip crime_level_interrupt = {
165 .name = "IP32 CRIME",
166 .ack = crime_level_mask_and_ack_irq,
167 .mask = crime_disable_irq,
168 .mask_ack = crime_level_mask_and_ack_irq,
169 .unmask = crime_enable_irq,
170 .end = crime_level_end_irq,
173 static void crime_edge_mask_and_ack_irq(unsigned int irq)
175 unsigned int bit = irq - CRIME_IRQ_BASE;
178 /* Edge triggered interrupts must be cleared. */
180 crime_int = crime->hard_int;
181 crime_int &= ~(1 << bit);
182 crime->hard_int = crime_int;
184 crime_disable_irq(irq);
187 static void crime_edge_end_irq(unsigned int irq)
189 if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
190 crime_enable_irq(irq);
193 static struct irq_chip crime_edge_interrupt = {
194 .name = "IP32 CRIME",
195 .ack = crime_edge_mask_and_ack_irq,
196 .mask = crime_disable_irq,
197 .mask_ack = crime_edge_mask_and_ack_irq,
198 .unmask = crime_enable_irq,
199 .end = crime_edge_end_irq,
203 * This is for MACE PCI interrupts. We can decrease bus traffic by masking
204 * as close to the source as possible. This also means we can take the
205 * next chunk of the CRIME register in one piece.
208 static unsigned long macepci_mask;
210 static void enable_macepci_irq(unsigned int irq)
212 macepci_mask |= MACEPCI_CONTROL_INT(irq - MACEPCI_SCSI0_IRQ);
213 mace->pci.control = macepci_mask;
214 crime_mask |= 1 << (irq - CRIME_IRQ_BASE);
215 crime->imask = crime_mask;
218 static void disable_macepci_irq(unsigned int irq)
220 crime_mask &= ~(1 << (irq - CRIME_IRQ_BASE));
221 crime->imask = crime_mask;
223 macepci_mask &= ~MACEPCI_CONTROL_INT(irq - MACEPCI_SCSI0_IRQ);
224 mace->pci.control = macepci_mask;
228 static void end_macepci_irq(unsigned int irq)
230 if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
231 enable_macepci_irq(irq);
234 static struct irq_chip ip32_macepci_interrupt = {
235 .name = "IP32 MACE PCI",
236 .ack = disable_macepci_irq,
237 .mask = disable_macepci_irq,
238 .mask_ack = disable_macepci_irq,
239 .unmask = enable_macepci_irq,
240 .end = end_macepci_irq,
243 /* This is used for MACE ISA interrupts. That means bits 4-6 in the
247 #define MACEISA_AUDIO_INT (MACEISA_AUDIO_SW_INT | \
248 MACEISA_AUDIO_SC_INT | \
249 MACEISA_AUDIO1_DMAT_INT | \
250 MACEISA_AUDIO1_OF_INT | \
251 MACEISA_AUDIO2_DMAT_INT | \
252 MACEISA_AUDIO2_MERR_INT | \
253 MACEISA_AUDIO3_DMAT_INT | \
254 MACEISA_AUDIO3_MERR_INT)
255 #define MACEISA_MISC_INT (MACEISA_RTC_INT | \
257 MACEISA_KEYB_POLL_INT | \
258 MACEISA_MOUSE_INT | \
259 MACEISA_MOUSE_POLL_INT | \
260 MACEISA_TIMER0_INT | \
261 MACEISA_TIMER1_INT | \
263 #define MACEISA_SUPERIO_INT (MACEISA_PARALLEL_INT | \
264 MACEISA_PAR_CTXA_INT | \
265 MACEISA_PAR_CTXB_INT | \
266 MACEISA_PAR_MERR_INT | \
267 MACEISA_SERIAL1_INT | \
268 MACEISA_SERIAL1_TDMAT_INT | \
269 MACEISA_SERIAL1_TDMAPR_INT | \
270 MACEISA_SERIAL1_TDMAME_INT | \
271 MACEISA_SERIAL1_RDMAT_INT | \
272 MACEISA_SERIAL1_RDMAOR_INT | \
273 MACEISA_SERIAL2_INT | \
274 MACEISA_SERIAL2_TDMAT_INT | \
275 MACEISA_SERIAL2_TDMAPR_INT | \
276 MACEISA_SERIAL2_TDMAME_INT | \
277 MACEISA_SERIAL2_RDMAT_INT | \
278 MACEISA_SERIAL2_RDMAOR_INT)
280 static unsigned long maceisa_mask;
282 static void enable_maceisa_irq(unsigned int irq)
284 unsigned int crime_int = 0;
286 pr_debug("maceisa enable: %u\n", irq);
289 case MACEISA_AUDIO_SW_IRQ ... MACEISA_AUDIO3_MERR_IRQ:
290 crime_int = MACE_AUDIO_INT;
292 case MACEISA_RTC_IRQ ... MACEISA_TIMER2_IRQ:
293 crime_int = MACE_MISC_INT;
295 case MACEISA_PARALLEL_IRQ ... MACEISA_SERIAL2_RDMAOR_IRQ:
296 crime_int = MACE_SUPERIO_INT;
299 pr_debug("crime_int %08x enabled\n", crime_int);
300 crime_mask |= crime_int;
301 crime->imask = crime_mask;
302 maceisa_mask |= 1 << (irq - MACEISA_AUDIO_SW_IRQ);
303 mace->perif.ctrl.imask = maceisa_mask;
306 static void disable_maceisa_irq(unsigned int irq)
308 unsigned int crime_int = 0;
310 maceisa_mask &= ~(1 << (irq - MACEISA_AUDIO_SW_IRQ));
311 if (!(maceisa_mask & MACEISA_AUDIO_INT))
312 crime_int |= MACE_AUDIO_INT;
313 if (!(maceisa_mask & MACEISA_MISC_INT))
314 crime_int |= MACE_MISC_INT;
315 if (!(maceisa_mask & MACEISA_SUPERIO_INT))
316 crime_int |= MACE_SUPERIO_INT;
317 crime_mask &= ~crime_int;
318 crime->imask = crime_mask;
320 mace->perif.ctrl.imask = maceisa_mask;
324 static void mask_and_ack_maceisa_irq(unsigned int irq)
326 unsigned long mace_int;
329 case MACEISA_PARALLEL_IRQ:
330 case MACEISA_SERIAL1_TDMAPR_IRQ:
331 case MACEISA_SERIAL2_TDMAPR_IRQ:
333 mace_int = mace->perif.ctrl.istat;
334 mace_int &= ~(1 << (irq - MACEISA_AUDIO_SW_IRQ));
335 mace->perif.ctrl.istat = mace_int;
338 disable_maceisa_irq(irq);
341 static void end_maceisa_irq(unsigned irq)
343 if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
344 enable_maceisa_irq(irq);
347 static struct irq_chip ip32_maceisa_interrupt = {
348 .name = "IP32 MACE ISA",
349 .ack = mask_and_ack_maceisa_irq,
350 .mask = disable_maceisa_irq,
351 .mask_ack = mask_and_ack_maceisa_irq,
352 .unmask = enable_maceisa_irq,
353 .end = end_maceisa_irq,
356 /* This is used for regular non-ISA, non-PCI MACE interrupts. That means
357 * bits 0-3 and 7 in the CRIME register.
360 static void enable_mace_irq(unsigned int irq)
362 unsigned int bit = irq - CRIME_IRQ_BASE;
364 crime_mask |= (1 << bit);
365 crime->imask = crime_mask;
368 static void disable_mace_irq(unsigned int irq)
370 unsigned int bit = irq - CRIME_IRQ_BASE;
372 crime_mask &= ~(1 << bit);
373 crime->imask = crime_mask;
377 static void end_mace_irq(unsigned int irq)
379 if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
380 enable_mace_irq(irq);
383 static struct irq_chip ip32_mace_interrupt = {
385 .ack = disable_mace_irq,
386 .mask = disable_mace_irq,
387 .mask_ack = disable_mace_irq,
388 .unmask = enable_mace_irq,
392 static void ip32_unknown_interrupt(void)
394 printk("Unknown interrupt occurred!\n");
395 printk("cp0_status: %08x\n", read_c0_status());
396 printk("cp0_cause: %08x\n", read_c0_cause());
397 printk("CRIME intr mask: %016lx\n", crime->imask);
398 printk("CRIME intr status: %016lx\n", crime->istat);
399 printk("CRIME hardware intr register: %016lx\n", crime->hard_int);
400 printk("MACE ISA intr mask: %08lx\n", mace->perif.ctrl.imask);
401 printk("MACE ISA intr status: %08lx\n", mace->perif.ctrl.istat);
402 printk("MACE PCI control register: %08x\n", mace->pci.control);
404 printk("Register dump:\n");
405 show_regs(get_irq_regs());
407 printk("Please mail this report to linux-mips@linux-mips.org\n");
408 printk("Spinning...");
412 /* CRIME 1.1 appears to deliver all interrupts to this one pin. */
413 /* change this to loop over all edge-triggered irqs, exception masked out ones */
414 static void ip32_irq0(void)
420 * Sanity check interrupt numbering enum.
421 * MACE got 32 interrupts and there are 32 MACE ISA interrupts daisy
424 BUILD_BUG_ON(CRIME_VICE_IRQ - MACE_VID_IN1_IRQ != 31);
425 BUILD_BUG_ON(MACEISA_SERIAL2_RDMAOR_IRQ - MACEISA_AUDIO_SW_IRQ != 31);
427 crime_int = crime->istat & crime_mask;
429 /* crime sometime delivers spurious interrupts, ignore them */
430 if (unlikely(crime_int == 0))
433 irq = MACE_VID_IN1_IRQ + __ffs(crime_int);
435 if (crime_int & CRIME_MACEISA_INT_MASK) {
436 unsigned long mace_int = mace->perif.ctrl.istat;
437 irq = __ffs(mace_int & maceisa_mask) + MACEISA_AUDIO_SW_IRQ;
440 pr_debug("*irq %u*\n", irq);
444 static void ip32_irq1(void)
446 ip32_unknown_interrupt();
449 static void ip32_irq2(void)
451 ip32_unknown_interrupt();
454 static void ip32_irq3(void)
456 ip32_unknown_interrupt();
459 static void ip32_irq4(void)
461 ip32_unknown_interrupt();
464 static void ip32_irq5(void)
466 do_IRQ(MIPS_CPU_IRQ_BASE + 7);
469 asmlinkage void plat_irq_dispatch(void)
471 unsigned int pending = read_c0_status() & read_c0_cause();
473 if (likely(pending & IE_IRQ0))
475 else if (unlikely(pending & IE_IRQ1))
477 else if (unlikely(pending & IE_IRQ2))
479 else if (unlikely(pending & IE_IRQ3))
481 else if (unlikely(pending & IE_IRQ4))
483 else if (likely(pending & IE_IRQ5))
487 void __init arch_init_irq(void)
491 /* Install our interrupt handler, then clear and disable all
492 * CRIME and MACE interrupts. */
496 mace->perif.ctrl.istat = 0;
497 mace->perif.ctrl.imask = 0;
500 for (irq = CRIME_IRQ_BASE; irq <= IP32_IRQ_MAX; irq++) {
502 case MACE_VID_IN1_IRQ ... MACE_PCI_BRIDGE_IRQ:
503 set_irq_chip(irq, &ip32_mace_interrupt);
505 case MACEPCI_SCSI0_IRQ ... MACEPCI_SHARED2_IRQ:
506 set_irq_chip(irq, &ip32_macepci_interrupt);
508 case CRIME_GBE0_IRQ ... CRIME_GBE3_IRQ:
509 set_irq_chip(irq, &crime_edge_interrupt);
511 case CRIME_CPUERR_IRQ:
512 case CRIME_MEMERR_IRQ:
513 set_irq_chip(irq, &crime_level_interrupt);
515 case CRIME_RE_EMPTY_E_IRQ ... CRIME_RE_IDLE_E_IRQ:
516 case CRIME_SOFT0_IRQ ... CRIME_SOFT2_IRQ:
517 set_irq_chip(irq, &crime_edge_interrupt);
520 set_irq_chip(irq, &crime_edge_interrupt);
523 set_irq_chip(irq, &ip32_maceisa_interrupt);
527 setup_irq(CRIME_MEMERR_IRQ, &memerr_irq);
528 setup_irq(CRIME_CPUERR_IRQ, &cpuerr_irq);
530 #define ALLINTS (IE_IRQ0 | IE_IRQ1 | IE_IRQ2 | IE_IRQ3 | IE_IRQ4 | IE_IRQ5)
531 change_c0_status(ST0_IM, ALLINTS);