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Linux 2.6.19-rc6
[cris-mirror.git] / arch / powerpc / sysdev / mpic.c
blobba4833f57d47e343b2433c14350f612d0beace03
1 /*
2 * arch/powerpc/kernel/mpic.c
3 *
4 * Driver for interrupt controllers following the OpenPIC standard, the
5 * common implementation beeing IBM's MPIC. This driver also can deal
6 * with various broken implementations of this HW.
7 *
8 * Copyright (C) 2004 Benjamin Herrenschmidt, IBM Corp.
9 *
10 * This file is subject to the terms and conditions of the GNU General Public
11 * License. See the file COPYING in the main directory of this archive
12 * for more details.
13 */
14
15 #undef DEBUG
16 #undef DEBUG_IPI
17 #undef DEBUG_IRQ
18 #undef DEBUG_LOW
19
20 #include <linux/types.h>
21 #include <linux/kernel.h>
22 #include <linux/init.h>
23 #include <linux/irq.h>
24 #include <linux/smp.h>
25 #include <linux/interrupt.h>
26 #include <linux/bootmem.h>
27 #include <linux/spinlock.h>
28 #include <linux/pci.h>
29
30 #include <asm/ptrace.h>
31 #include <asm/signal.h>
32 #include <asm/io.h>
33 #include <asm/pgtable.h>
34 #include <asm/irq.h>
35 #include <asm/machdep.h>
36 #include <asm/mpic.h>
37 #include <asm/smp.h>
38
39 #ifdef DEBUG
40 #define DBG(fmt...) printk(fmt)
41 #else
42 #define DBG(fmt...)
43 #endif
44
45 static struct mpic *mpics;
46 static struct mpic *mpic_primary;
47 static DEFINE_SPINLOCK(mpic_lock);
48
49 #ifdef CONFIG_PPC32 /* XXX for now */
50 #ifdef CONFIG_IRQ_ALL_CPUS
51 #define distribute_irqs (1)
52 #else
53 #define distribute_irqs (0)
54 #endif
55 #endif
56
57 #ifdef CONFIG_MPIC_WEIRD
58 static u32 mpic_infos[][MPIC_IDX_END] = {
59 [0] = { /* Original OpenPIC compatible MPIC */
60 MPIC_GREG_BASE,
61 MPIC_GREG_FEATURE_0,
62 MPIC_GREG_GLOBAL_CONF_0,
63 MPIC_GREG_VENDOR_ID,
64 MPIC_GREG_IPI_VECTOR_PRI_0,
65 MPIC_GREG_IPI_STRIDE,
66 MPIC_GREG_SPURIOUS,
67 MPIC_GREG_TIMER_FREQ,
68
69 MPIC_TIMER_BASE,
70 MPIC_TIMER_STRIDE,
71 MPIC_TIMER_CURRENT_CNT,
72 MPIC_TIMER_BASE_CNT,
73 MPIC_TIMER_VECTOR_PRI,
74 MPIC_TIMER_DESTINATION,
75
76 MPIC_CPU_BASE,
77 MPIC_CPU_STRIDE,
78 MPIC_CPU_IPI_DISPATCH_0,
79 MPIC_CPU_IPI_DISPATCH_STRIDE,
80 MPIC_CPU_CURRENT_TASK_PRI,
81 MPIC_CPU_WHOAMI,
82 MPIC_CPU_INTACK,
83 MPIC_CPU_EOI,
84
85 MPIC_IRQ_BASE,
86 MPIC_IRQ_STRIDE,
87 MPIC_IRQ_VECTOR_PRI,
88 MPIC_VECPRI_VECTOR_MASK,
89 MPIC_VECPRI_POLARITY_POSITIVE,
90 MPIC_VECPRI_POLARITY_NEGATIVE,
91 MPIC_VECPRI_SENSE_LEVEL,
92 MPIC_VECPRI_SENSE_EDGE,
93 MPIC_VECPRI_POLARITY_MASK,
94 MPIC_VECPRI_SENSE_MASK,
95 MPIC_IRQ_DESTINATION
96 },
97 [1] = { /* Tsi108/109 PIC */
98 TSI108_GREG_BASE,
99 TSI108_GREG_FEATURE_0,
100 TSI108_GREG_GLOBAL_CONF_0,
101 TSI108_GREG_VENDOR_ID,
102 TSI108_GREG_IPI_VECTOR_PRI_0,
103 TSI108_GREG_IPI_STRIDE,
104 TSI108_GREG_SPURIOUS,
105 TSI108_GREG_TIMER_FREQ,
106
107 TSI108_TIMER_BASE,
108 TSI108_TIMER_STRIDE,
109 TSI108_TIMER_CURRENT_CNT,
110 TSI108_TIMER_BASE_CNT,
111 TSI108_TIMER_VECTOR_PRI,
112 TSI108_TIMER_DESTINATION,
113
114 TSI108_CPU_BASE,
115 TSI108_CPU_STRIDE,
116 TSI108_CPU_IPI_DISPATCH_0,
117 TSI108_CPU_IPI_DISPATCH_STRIDE,
118 TSI108_CPU_CURRENT_TASK_PRI,
119 TSI108_CPU_WHOAMI,
120 TSI108_CPU_INTACK,
121 TSI108_CPU_EOI,
122
123 TSI108_IRQ_BASE,
124 TSI108_IRQ_STRIDE,
125 TSI108_IRQ_VECTOR_PRI,
126 TSI108_VECPRI_VECTOR_MASK,
127 TSI108_VECPRI_POLARITY_POSITIVE,
128 TSI108_VECPRI_POLARITY_NEGATIVE,
129 TSI108_VECPRI_SENSE_LEVEL,
130 TSI108_VECPRI_SENSE_EDGE,
131 TSI108_VECPRI_POLARITY_MASK,
132 TSI108_VECPRI_SENSE_MASK,
133 TSI108_IRQ_DESTINATION
134 },
135 };
136
137 #define MPIC_INFO(name) mpic->hw_set[MPIC_IDX_##name]
138
139 #else /* CONFIG_MPIC_WEIRD */
140
141 #define MPIC_INFO(name) MPIC_##name
142
143 #endif /* CONFIG_MPIC_WEIRD */
144
145 /*
146 * Register accessor functions
147 */
148
149
150 static inline u32 _mpic_read(unsigned int be, volatile u32 __iomem *base,
151 unsigned int reg)
152 {
153 if (be)
154 return in_be32(base + (reg >> 2));
155 else
156 return in_le32(base + (reg >> 2));
157 }
158
159 static inline void _mpic_write(unsigned int be, volatile u32 __iomem *base,
160 unsigned int reg, u32 value)
161 {
162 if (be)
163 out_be32(base + (reg >> 2), value);
164 else
165 out_le32(base + (reg >> 2), value);
166 }
167
168 static inline u32 _mpic_ipi_read(struct mpic *mpic, unsigned int ipi)
169 {
170 unsigned int be = (mpic->flags & MPIC_BIG_ENDIAN) != 0;
171 unsigned int offset = MPIC_INFO(GREG_IPI_VECTOR_PRI_0) +
172 (ipi * MPIC_INFO(GREG_IPI_STRIDE));
173
174 if (mpic->flags & MPIC_BROKEN_IPI)
175 be = !be;
176 return _mpic_read(be, mpic->gregs, offset);
177 }
178
179 static inline void _mpic_ipi_write(struct mpic *mpic, unsigned int ipi, u32 value)
180 {
181 unsigned int offset = MPIC_INFO(GREG_IPI_VECTOR_PRI_0) +
182 (ipi * MPIC_INFO(GREG_IPI_STRIDE));
183
184 _mpic_write(mpic->flags & MPIC_BIG_ENDIAN, mpic->gregs, offset, value);
185 }
186
187 static inline u32 _mpic_cpu_read(struct mpic *mpic, unsigned int reg)
188 {
189 unsigned int cpu = 0;
190
191 if (mpic->flags & MPIC_PRIMARY)
192 cpu = hard_smp_processor_id();
193 return _mpic_read(mpic->flags & MPIC_BIG_ENDIAN,
194 mpic->cpuregs[cpu], reg);
195 }
196
197 static inline void _mpic_cpu_write(struct mpic *mpic, unsigned int reg, u32 value)
198 {
199 unsigned int cpu = 0;
200
201 if (mpic->flags & MPIC_PRIMARY)
202 cpu = hard_smp_processor_id();
203
204 _mpic_write(mpic->flags & MPIC_BIG_ENDIAN, mpic->cpuregs[cpu], reg, value);
205 }
206
207 static inline u32 _mpic_irq_read(struct mpic *mpic, unsigned int src_no, unsigned int reg)
208 {
209 unsigned int isu = src_no >> mpic->isu_shift;
210 unsigned int idx = src_no & mpic->isu_mask;
211
212 return _mpic_read(mpic->flags & MPIC_BIG_ENDIAN, mpic->isus[isu],
213 reg + (idx * MPIC_INFO(IRQ_STRIDE)));
214 }
215
216 static inline void _mpic_irq_write(struct mpic *mpic, unsigned int src_no,
217 unsigned int reg, u32 value)
218 {
219 unsigned int isu = src_no >> mpic->isu_shift;
220 unsigned int idx = src_no & mpic->isu_mask;
221
222 _mpic_write(mpic->flags & MPIC_BIG_ENDIAN, mpic->isus[isu],
223 reg + (idx * MPIC_INFO(IRQ_STRIDE)), value);
224 }
225
226 #define mpic_read(b,r) _mpic_read(mpic->flags & MPIC_BIG_ENDIAN,(b),(r))
227 #define mpic_write(b,r,v) _mpic_write(mpic->flags & MPIC_BIG_ENDIAN,(b),(r),(v))
228 #define mpic_ipi_read(i) _mpic_ipi_read(mpic,(i))
229 #define mpic_ipi_write(i,v) _mpic_ipi_write(mpic,(i),(v))
230 #define mpic_cpu_read(i) _mpic_cpu_read(mpic,(i))
231 #define mpic_cpu_write(i,v) _mpic_cpu_write(mpic,(i),(v))
232 #define mpic_irq_read(s,r) _mpic_irq_read(mpic,(s),(r))
233 #define mpic_irq_write(s,r,v) _mpic_irq_write(mpic,(s),(r),(v))
234
235
236 /*
237 * Low level utility functions
238 */
239
240
241
242 /* Check if we have one of those nice broken MPICs with a flipped endian on
243 * reads from IPI registers
244 */
245 static void __init mpic_test_broken_ipi(struct mpic *mpic)
246 {
247 u32 r;
248
249 mpic_write(mpic->gregs, MPIC_INFO(GREG_IPI_VECTOR_PRI_0), MPIC_VECPRI_MASK);
250 r = mpic_read(mpic->gregs, MPIC_INFO(GREG_IPI_VECTOR_PRI_0));
251
252 if (r == le32_to_cpu(MPIC_VECPRI_MASK)) {
253 printk(KERN_INFO "mpic: Detected reversed IPI registers\n");
254 mpic->flags |= MPIC_BROKEN_IPI;
255 }
256 }
257
258 #ifdef CONFIG_MPIC_BROKEN_U3
259
260 /* Test if an interrupt is sourced from HyperTransport (used on broken U3s)
261 * to force the edge setting on the MPIC and do the ack workaround.
262 */
263 static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source)
264 {
265 if (source >= 128 || !mpic->fixups)
266 return 0;
267 return mpic->fixups[source].base != NULL;
268 }
269
270
271 static inline void mpic_ht_end_irq(struct mpic *mpic, unsigned int source)
272 {
273 struct mpic_irq_fixup *fixup = &mpic->fixups[source];
274
275 if (fixup->applebase) {
276 unsigned int soff = (fixup->index >> 3) & ~3;
277 unsigned int mask = 1U << (fixup->index & 0x1f);
278 writel(mask, fixup->applebase + soff);
279 } else {
280 spin_lock(&mpic->fixup_lock);
281 writeb(0x11 + 2 * fixup->index, fixup->base + 2);
282 writel(fixup->data, fixup->base + 4);
283 spin_unlock(&mpic->fixup_lock);
284 }
285 }
286
287 static void mpic_startup_ht_interrupt(struct mpic *mpic, unsigned int source,
288 unsigned int irqflags)
289 {
290 struct mpic_irq_fixup *fixup = &mpic->fixups[source];
291 unsigned long flags;
292 u32 tmp;
293
294 if (fixup->base == NULL)
295 return;
296
297 DBG("startup_ht_interrupt(0x%x, 0x%x) index: %d\n",
298 source, irqflags, fixup->index);
299 spin_lock_irqsave(&mpic->fixup_lock, flags);
300 /* Enable and configure */
301 writeb(0x10 + 2 * fixup->index, fixup->base + 2);
302 tmp = readl(fixup->base + 4);
303 tmp &= ~(0x23U);
304 if (irqflags & IRQ_LEVEL)
305 tmp |= 0x22;
306 writel(tmp, fixup->base + 4);
307 spin_unlock_irqrestore(&mpic->fixup_lock, flags);
308 }
309
310 static void mpic_shutdown_ht_interrupt(struct mpic *mpic, unsigned int source,
311 unsigned int irqflags)
312 {
313 struct mpic_irq_fixup *fixup = &mpic->fixups[source];
314 unsigned long flags;
315 u32 tmp;
316
317 if (fixup->base == NULL)
318 return;
319
320 DBG("shutdown_ht_interrupt(0x%x, 0x%x)\n", source, irqflags);
321
322 /* Disable */
323 spin_lock_irqsave(&mpic->fixup_lock, flags);
324 writeb(0x10 + 2 * fixup->index, fixup->base + 2);
325 tmp = readl(fixup->base + 4);
326 tmp |= 1;
327 writel(tmp, fixup->base + 4);
328 spin_unlock_irqrestore(&mpic->fixup_lock, flags);
329 }
330
331 static void __init mpic_scan_ht_pic(struct mpic *mpic, u8 __iomem *devbase,
332 unsigned int devfn, u32 vdid)
333 {
334 int i, irq, n;
335 u8 __iomem *base;
336 u32 tmp;
337 u8 pos;
338
339 for (pos = readb(devbase + PCI_CAPABILITY_LIST); pos != 0;
340 pos = readb(devbase + pos + PCI_CAP_LIST_NEXT)) {
341 u8 id = readb(devbase + pos + PCI_CAP_LIST_ID);
342 if (id == PCI_CAP_ID_HT) {
343 id = readb(devbase + pos + 3);
344 if (id == HT_CAPTYPE_IRQ)
345 break;
346 }
347 }
348 if (pos == 0)
349 return;
350
351 base = devbase + pos;
352 writeb(0x01, base + 2);
353 n = (readl(base + 4) >> 16) & 0xff;
354
355 printk(KERN_INFO "mpic: - HT:%02x.%x [0x%02x] vendor %04x device %04x"
356 " has %d irqs\n",
357 devfn >> 3, devfn & 0x7, pos, vdid & 0xffff, vdid >> 16, n + 1);
358
359 for (i = 0; i <= n; i++) {
360 writeb(0x10 + 2 * i, base + 2);
361 tmp = readl(base + 4);
362 irq = (tmp >> 16) & 0xff;
363 DBG("HT PIC index 0x%x, irq 0x%x, tmp: %08x\n", i, irq, tmp);
364 /* mask it , will be unmasked later */
365 tmp |= 0x1;
366 writel(tmp, base + 4);
367 mpic->fixups[irq].index = i;
368 mpic->fixups[irq].base = base;
369 /* Apple HT PIC has a non-standard way of doing EOIs */
370 if ((vdid & 0xffff) == 0x106b)
371 mpic->fixups[irq].applebase = devbase + 0x60;
372 else
373 mpic->fixups[irq].applebase = NULL;
374 writeb(0x11 + 2 * i, base + 2);
375 mpic->fixups[irq].data = readl(base + 4) | 0x80000000;
376 }
377 }
378
379
380 static void __init mpic_scan_ht_pics(struct mpic *mpic)
381 {
382 unsigned int devfn;
383 u8 __iomem *cfgspace;
384
385 printk(KERN_INFO "mpic: Setting up HT PICs workarounds for U3/U4\n");
386
387 /* Allocate fixups array */
388 mpic->fixups = alloc_bootmem(128 * sizeof(struct mpic_irq_fixup));
389 BUG_ON(mpic->fixups == NULL);
390 memset(mpic->fixups, 0, 128 * sizeof(struct mpic_irq_fixup));
391
392 /* Init spinlock */
393 spin_lock_init(&mpic->fixup_lock);
394
395 /* Map U3 config space. We assume all IO-APICs are on the primary bus
396 * so we only need to map 64kB.
397 */
398 cfgspace = ioremap(0xf2000000, 0x10000);
399 BUG_ON(cfgspace == NULL);
400
401 /* Now we scan all slots. We do a very quick scan, we read the header
402 * type, vendor ID and device ID only, that's plenty enough
403 */
404 for (devfn = 0; devfn < 0x100; devfn++) {
405 u8 __iomem *devbase = cfgspace + (devfn << 8);
406 u8 hdr_type = readb(devbase + PCI_HEADER_TYPE);
407 u32 l = readl(devbase + PCI_VENDOR_ID);
408 u16 s;
409
410 DBG("devfn %x, l: %x\n", devfn, l);
411
412 /* If no device, skip */
413 if (l == 0xffffffff || l == 0x00000000 ||
414 l == 0x0000ffff || l == 0xffff0000)
415 goto next;
416 /* Check if is supports capability lists */
417 s = readw(devbase + PCI_STATUS);
418 if (!(s & PCI_STATUS_CAP_LIST))
419 goto next;
420
421 mpic_scan_ht_pic(mpic, devbase, devfn, l);
422
423 next:
424 /* next device, if function 0 */
425 if (PCI_FUNC(devfn) == 0 && (hdr_type & 0x80) == 0)
426 devfn += 7;
427 }
428 }
429
430 #else /* CONFIG_MPIC_BROKEN_U3 */
431
432 static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source)
433 {
434 return 0;
435 }
436
437 static void __init mpic_scan_ht_pics(struct mpic *mpic)
438 {
439 }
440
441 #endif /* CONFIG_MPIC_BROKEN_U3 */
442
443
444 #define mpic_irq_to_hw(virq) ((unsigned int)irq_map[virq].hwirq)
445
446 /* Find an mpic associated with a given linux interrupt */
447 static struct mpic *mpic_find(unsigned int irq, unsigned int *is_ipi)
448 {
449 unsigned int src = mpic_irq_to_hw(irq);
450
451 if (irq < NUM_ISA_INTERRUPTS)
452 return NULL;
453 if (is_ipi)
454 *is_ipi = (src >= MPIC_VEC_IPI_0 && src <= MPIC_VEC_IPI_3);
455
456 return irq_desc[irq].chip_data;
457 }
458
459 /* Convert a cpu mask from logical to physical cpu numbers. */
460 static inline u32 mpic_physmask(u32 cpumask)
461 {
462 int i;
463 u32 mask = 0;
464
465 for (i = 0; i < NR_CPUS; ++i, cpumask >>= 1)
466 mask |= (cpumask & 1) << get_hard_smp_processor_id(i);
467 return mask;
468 }
469
470 #ifdef CONFIG_SMP
471 /* Get the mpic structure from the IPI number */
472 static inline struct mpic * mpic_from_ipi(unsigned int ipi)
473 {
474 return irq_desc[ipi].chip_data;
475 }
476 #endif
477
478 /* Get the mpic structure from the irq number */
479 static inline struct mpic * mpic_from_irq(unsigned int irq)
480 {
481 return irq_desc[irq].chip_data;
482 }
483
484 /* Send an EOI */
485 static inline void mpic_eoi(struct mpic *mpic)
486 {
487 mpic_cpu_write(MPIC_INFO(CPU_EOI), 0);
488 (void)mpic_cpu_read(MPIC_INFO(CPU_WHOAMI));
489 }
490
491 #ifdef CONFIG_SMP
492 static irqreturn_t mpic_ipi_action(int irq, void *dev_id)
493 {
494 smp_message_recv(mpic_irq_to_hw(irq) - MPIC_VEC_IPI_0);
495 return IRQ_HANDLED;
496 }
497 #endif /* CONFIG_SMP */
498
499 /*
500 * Linux descriptor level callbacks
501 */
502
503
504 static void mpic_unmask_irq(unsigned int irq)
505 {
506 unsigned int loops = 100000;
507 struct mpic *mpic = mpic_from_irq(irq);
508 unsigned int src = mpic_irq_to_hw(irq);
509
510 DBG("%p: %s: enable_irq: %d (src %d)\n", mpic, mpic->name, irq, src);
511
512 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
513 mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) &
514 ~MPIC_VECPRI_MASK);
515 /* make sure mask gets to controller before we return to user */
516 do {
517 if (!loops--) {
518 printk(KERN_ERR "mpic_enable_irq timeout\n");
519 break;
520 }
521 } while(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK);
522 }
523
524 static void mpic_mask_irq(unsigned int irq)
525 {
526 unsigned int loops = 100000;
527 struct mpic *mpic = mpic_from_irq(irq);
528 unsigned int src = mpic_irq_to_hw(irq);
529
530 DBG("%s: disable_irq: %d (src %d)\n", mpic->name, irq, src);
531
532 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
533 mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) |
534 MPIC_VECPRI_MASK);
535
536 /* make sure mask gets to controller before we return to user */
537 do {
538 if (!loops--) {
539 printk(KERN_ERR "mpic_enable_irq timeout\n");
540 break;
541 }
542 } while(!(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK));
543 }
544
545 static void mpic_end_irq(unsigned int irq)
546 {
547 struct mpic *mpic = mpic_from_irq(irq);
548
549 #ifdef DEBUG_IRQ
550 DBG("%s: end_irq: %d\n", mpic->name, irq);
551 #endif
552 /* We always EOI on end_irq() even for edge interrupts since that
553 * should only lower the priority, the MPIC should have properly
554 * latched another edge interrupt coming in anyway
555 */
556
557 mpic_eoi(mpic);
558 }
559
560 #ifdef CONFIG_MPIC_BROKEN_U3
561
562 static void mpic_unmask_ht_irq(unsigned int irq)
563 {
564 struct mpic *mpic = mpic_from_irq(irq);
565 unsigned int src = mpic_irq_to_hw(irq);
566
567 mpic_unmask_irq(irq);
568
569 if (irq_desc[irq].status & IRQ_LEVEL)
570 mpic_ht_end_irq(mpic, src);
571 }
572
573 static unsigned int mpic_startup_ht_irq(unsigned int irq)
574 {
575 struct mpic *mpic = mpic_from_irq(irq);
576 unsigned int src = mpic_irq_to_hw(irq);
577
578 mpic_unmask_irq(irq);
579 mpic_startup_ht_interrupt(mpic, src, irq_desc[irq].status);
580
581 return 0;
582 }
583
584 static void mpic_shutdown_ht_irq(unsigned int irq)
585 {
586 struct mpic *mpic = mpic_from_irq(irq);
587 unsigned int src = mpic_irq_to_hw(irq);
588
589 mpic_shutdown_ht_interrupt(mpic, src, irq_desc[irq].status);
590 mpic_mask_irq(irq);
591 }
592
593 static void mpic_end_ht_irq(unsigned int irq)
594 {
595 struct mpic *mpic = mpic_from_irq(irq);
596 unsigned int src = mpic_irq_to_hw(irq);
597
598 #ifdef DEBUG_IRQ
599 DBG("%s: end_irq: %d\n", mpic->name, irq);
600 #endif
601 /* We always EOI on end_irq() even for edge interrupts since that
602 * should only lower the priority, the MPIC should have properly
603 * latched another edge interrupt coming in anyway
604 */
605
606 if (irq_desc[irq].status & IRQ_LEVEL)
607 mpic_ht_end_irq(mpic, src);
608 mpic_eoi(mpic);
609 }
610 #endif /* !CONFIG_MPIC_BROKEN_U3 */
611
612 #ifdef CONFIG_SMP
613
614 static void mpic_unmask_ipi(unsigned int irq)
615 {
616 struct mpic *mpic = mpic_from_ipi(irq);
617 unsigned int src = mpic_irq_to_hw(irq) - MPIC_VEC_IPI_0;
618
619 DBG("%s: enable_ipi: %d (ipi %d)\n", mpic->name, irq, src);
620 mpic_ipi_write(src, mpic_ipi_read(src) & ~MPIC_VECPRI_MASK);
621 }
622
623 static void mpic_mask_ipi(unsigned int irq)
624 {
625 /* NEVER disable an IPI... that's just plain wrong! */
626 }
627
628 static void mpic_end_ipi(unsigned int irq)
629 {
630 struct mpic *mpic = mpic_from_ipi(irq);
631
632 /*
633 * IPIs are marked IRQ_PER_CPU. This has the side effect of
634 * preventing the IRQ_PENDING/IRQ_INPROGRESS logic from
635 * applying to them. We EOI them late to avoid re-entering.
636 * We mark IPI's with IRQF_DISABLED as they must run with
637 * irqs disabled.
638 */
639 mpic_eoi(mpic);
640 }
641
642 #endif /* CONFIG_SMP */
643
644 static void mpic_set_affinity(unsigned int irq, cpumask_t cpumask)
645 {
646 struct mpic *mpic = mpic_from_irq(irq);
647 unsigned int src = mpic_irq_to_hw(irq);
648
649 cpumask_t tmp;
650
651 cpus_and(tmp, cpumask, cpu_online_map);
652
653 mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION),
654 mpic_physmask(cpus_addr(tmp)[0]));
655 }
656
657 static unsigned int mpic_type_to_vecpri(struct mpic *mpic, unsigned int type)
658 {
659 /* Now convert sense value */
660 switch(type & IRQ_TYPE_SENSE_MASK) {
661 case IRQ_TYPE_EDGE_RISING:
662 return MPIC_INFO(VECPRI_SENSE_EDGE) |
663 MPIC_INFO(VECPRI_POLARITY_POSITIVE);
664 case IRQ_TYPE_EDGE_FALLING:
665 case IRQ_TYPE_EDGE_BOTH:
666 return MPIC_INFO(VECPRI_SENSE_EDGE) |
667 MPIC_INFO(VECPRI_POLARITY_NEGATIVE);
668 case IRQ_TYPE_LEVEL_HIGH:
669 return MPIC_INFO(VECPRI_SENSE_LEVEL) |
670 MPIC_INFO(VECPRI_POLARITY_POSITIVE);
671 case IRQ_TYPE_LEVEL_LOW:
672 default:
673 return MPIC_INFO(VECPRI_SENSE_LEVEL) |
674 MPIC_INFO(VECPRI_POLARITY_NEGATIVE);
675 }
676 }
677
678 static int mpic_set_irq_type(unsigned int virq, unsigned int flow_type)
679 {
680 struct mpic *mpic = mpic_from_irq(virq);
681 unsigned int src = mpic_irq_to_hw(virq);
682 struct irq_desc *desc = get_irq_desc(virq);
683 unsigned int vecpri, vold, vnew;
684
685 DBG("mpic: set_irq_type(mpic:@%p,virq:%d,src:0x%x,type:0x%x)\n",
686 mpic, virq, src, flow_type);
687
688 if (src >= mpic->irq_count)
689 return -EINVAL;
690
691 if (flow_type == IRQ_TYPE_NONE)
692 if (mpic->senses && src < mpic->senses_count)
693 flow_type = mpic->senses[src];
694 if (flow_type == IRQ_TYPE_NONE)
695 flow_type = IRQ_TYPE_LEVEL_LOW;
696
697 desc->status &= ~(IRQ_TYPE_SENSE_MASK | IRQ_LEVEL);
698 desc->status |= flow_type & IRQ_TYPE_SENSE_MASK;
699 if (flow_type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
700 desc->status |= IRQ_LEVEL;
701
702 if (mpic_is_ht_interrupt(mpic, src))
703 vecpri = MPIC_VECPRI_POLARITY_POSITIVE |
704 MPIC_VECPRI_SENSE_EDGE;
705 else
706 vecpri = mpic_type_to_vecpri(mpic, flow_type);
707
708 vold = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI));
709 vnew = vold & ~(MPIC_INFO(VECPRI_POLARITY_MASK) |
710 MPIC_INFO(VECPRI_SENSE_MASK));
711 vnew |= vecpri;
712 if (vold != vnew)
713 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), vnew);
714
715 return 0;
716 }
717
718 static struct irq_chip mpic_irq_chip = {
719 .mask = mpic_mask_irq,
720 .unmask = mpic_unmask_irq,
721 .eoi = mpic_end_irq,
722 .set_type = mpic_set_irq_type,
723 };
724
725 #ifdef CONFIG_SMP
726 static struct irq_chip mpic_ipi_chip = {
727 .mask = mpic_mask_ipi,
728 .unmask = mpic_unmask_ipi,
729 .eoi = mpic_end_ipi,
730 };
731 #endif /* CONFIG_SMP */
732
733 #ifdef CONFIG_MPIC_BROKEN_U3
734 static struct irq_chip mpic_irq_ht_chip = {
735 .startup = mpic_startup_ht_irq,
736 .shutdown = mpic_shutdown_ht_irq,
737 .mask = mpic_mask_irq,
738 .unmask = mpic_unmask_ht_irq,
739 .eoi = mpic_end_ht_irq,
740 .set_type = mpic_set_irq_type,
741 };
742 #endif /* CONFIG_MPIC_BROKEN_U3 */
743
744
745 static int mpic_host_match(struct irq_host *h, struct device_node *node)
746 {
747 struct mpic *mpic = h->host_data;
748
749 /* Exact match, unless mpic node is NULL */
750 return mpic->of_node == NULL || mpic->of_node == node;
751 }
752
753 static int mpic_host_map(struct irq_host *h, unsigned int virq,
754 irq_hw_number_t hw)
755 {
756 struct mpic *mpic = h->host_data;
757 struct irq_chip *chip;
758
759 DBG("mpic: map virq %d, hwirq 0x%lx\n", virq, hw);
760
761 if (hw == MPIC_VEC_SPURRIOUS)
762 return -EINVAL;
763
764 #ifdef CONFIG_SMP
765 else if (hw >= MPIC_VEC_IPI_0) {
766 WARN_ON(!(mpic->flags & MPIC_PRIMARY));
767
768 DBG("mpic: mapping as IPI\n");
769 set_irq_chip_data(virq, mpic);
770 set_irq_chip_and_handler(virq, &mpic->hc_ipi,
771 handle_percpu_irq);
772 return 0;
773 }
774 #endif /* CONFIG_SMP */
775
776 if (hw >= mpic->irq_count)
777 return -EINVAL;
778
779 /* Default chip */
780 chip = &mpic->hc_irq;
781
782 #ifdef CONFIG_MPIC_BROKEN_U3
783 /* Check for HT interrupts, override vecpri */
784 if (mpic_is_ht_interrupt(mpic, hw))
785 chip = &mpic->hc_ht_irq;
786 #endif /* CONFIG_MPIC_BROKEN_U3 */
787
788 DBG("mpic: mapping to irq chip @%p\n", chip);
789
790 set_irq_chip_data(virq, mpic);
791 set_irq_chip_and_handler(virq, chip, handle_fasteoi_irq);
792
793 /* Set default irq type */
794 set_irq_type(virq, IRQ_TYPE_NONE);
795
796 return 0;
797 }
798
799 static int mpic_host_xlate(struct irq_host *h, struct device_node *ct,
800 u32 *intspec, unsigned int intsize,
801 irq_hw_number_t *out_hwirq, unsigned int *out_flags)
802
803 {
804 static unsigned char map_mpic_senses[4] = {
805 IRQ_TYPE_EDGE_RISING,
806 IRQ_TYPE_LEVEL_LOW,
807 IRQ_TYPE_LEVEL_HIGH,
808 IRQ_TYPE_EDGE_FALLING,
809 };
810
811 *out_hwirq = intspec[0];
812 if (intsize > 1) {
813 u32 mask = 0x3;
814
815 /* Apple invented a new race of encoding on machines with
816 * an HT APIC. They encode, among others, the index within
817 * the HT APIC. We don't care about it here since thankfully,
818 * it appears that they have the APIC already properly
819 * configured, and thus our current fixup code that reads the
820 * APIC config works fine. However, we still need to mask out
821 * bits in the specifier to make sure we only get bit 0 which
822 * is the level/edge bit (the only sense bit exposed by Apple),
823 * as their bit 1 means something else.
824 */
825 if (machine_is(powermac))
826 mask = 0x1;
827 *out_flags = map_mpic_senses[intspec[1] & mask];
828 } else
829 *out_flags = IRQ_TYPE_NONE;
830
831 DBG("mpic: xlate (%d cells: 0x%08x 0x%08x) to line 0x%lx sense 0x%x\n",
832 intsize, intspec[0], intspec[1], *out_hwirq, *out_flags);
833
834 return 0;
835 }
836
837 static struct irq_host_ops mpic_host_ops = {
838 .match = mpic_host_match,
839 .map = mpic_host_map,
840 .xlate = mpic_host_xlate,
841 };
842
843 /*
844 * Exported functions
845 */
846
847 struct mpic * __init mpic_alloc(struct device_node *node,
848 unsigned long phys_addr,
849 unsigned int flags,
850 unsigned int isu_size,
851 unsigned int irq_count,
852 const char *name)
853 {
854 struct mpic *mpic;
855 u32 reg;
856 const char *vers;
857 int i;
858
859 mpic = alloc_bootmem(sizeof(struct mpic));
860 if (mpic == NULL)
861 return NULL;
862
863 memset(mpic, 0, sizeof(struct mpic));
864 mpic->name = name;
865 mpic->of_node = node ? of_node_get(node) : NULL;
866
867 mpic->irqhost = irq_alloc_host(IRQ_HOST_MAP_LINEAR, 256,
868 &mpic_host_ops,
869 MPIC_VEC_SPURRIOUS);
870 if (mpic->irqhost == NULL) {
871 of_node_put(node);
872 return NULL;
873 }
874
875 mpic->irqhost->host_data = mpic;
876 mpic->hc_irq = mpic_irq_chip;
877 mpic->hc_irq.typename = name;
878 if (flags & MPIC_PRIMARY)
879 mpic->hc_irq.set_affinity = mpic_set_affinity;
880 #ifdef CONFIG_MPIC_BROKEN_U3
881 mpic->hc_ht_irq = mpic_irq_ht_chip;
882 mpic->hc_ht_irq.typename = name;
883 if (flags & MPIC_PRIMARY)
884 mpic->hc_ht_irq.set_affinity = mpic_set_affinity;
885 #endif /* CONFIG_MPIC_BROKEN_U3 */
886 #ifdef CONFIG_SMP
887 mpic->hc_ipi = mpic_ipi_chip;
888 mpic->hc_ipi.typename = name;
889 #endif /* CONFIG_SMP */
890
891 mpic->flags = flags;
892 mpic->isu_size = isu_size;
893 mpic->irq_count = irq_count;
894 mpic->num_sources = 0; /* so far */
895
896 #ifdef CONFIG_MPIC_WEIRD
897 mpic->hw_set = mpic_infos[MPIC_GET_REGSET(flags)];
898 #endif
899
900 /* Map the global registers */
901 mpic->gregs = ioremap(phys_addr + MPIC_INFO(GREG_BASE), 0x1000);
902 mpic->tmregs = mpic->gregs +
903 ((MPIC_INFO(TIMER_BASE) - MPIC_INFO(GREG_BASE)) >> 2);
904 BUG_ON(mpic->gregs == NULL);
905
906 /* Reset */
907 if (flags & MPIC_WANTS_RESET) {
908 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
909 mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
910 | MPIC_GREG_GCONF_RESET);
911 while( mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
912 & MPIC_GREG_GCONF_RESET)
913 mb();
914 }
915
916 /* Read feature register, calculate num CPUs and, for non-ISU
917 * MPICs, num sources as well. On ISU MPICs, sources are counted
918 * as ISUs are added
919 */
920 reg = mpic_read(mpic->gregs, MPIC_INFO(GREG_FEATURE_0));
921 mpic->num_cpus = ((reg & MPIC_GREG_FEATURE_LAST_CPU_MASK)
922 >> MPIC_GREG_FEATURE_LAST_CPU_SHIFT) + 1;
923 if (isu_size == 0)
924 mpic->num_sources = ((reg & MPIC_GREG_FEATURE_LAST_SRC_MASK)
925 >> MPIC_GREG_FEATURE_LAST_SRC_SHIFT) + 1;
926
927 /* Map the per-CPU registers */
928 for (i = 0; i < mpic->num_cpus; i++) {
929 mpic->cpuregs[i] = ioremap(phys_addr + MPIC_INFO(CPU_BASE) +
930 i * MPIC_INFO(CPU_STRIDE), 0x1000);
931 BUG_ON(mpic->cpuregs[i] == NULL);
932 }
933
934 /* Initialize main ISU if none provided */
935 if (mpic->isu_size == 0) {
936 mpic->isu_size = mpic->num_sources;
937 mpic->isus[0] = ioremap(phys_addr + MPIC_INFO(IRQ_BASE),
938 MPIC_INFO(IRQ_STRIDE) * mpic->isu_size);
939 BUG_ON(mpic->isus[0] == NULL);
940 }
941 mpic->isu_shift = 1 + __ilog2(mpic->isu_size - 1);
942 mpic->isu_mask = (1 << mpic->isu_shift) - 1;
943
944 /* Display version */
945 switch (reg & MPIC_GREG_FEATURE_VERSION_MASK) {
946 case 1:
947 vers = "1.0";
948 break;
949 case 2:
950 vers = "1.2";
951 break;
952 case 3:
953 vers = "1.3";
954 break;
955 default:
956 vers = "<unknown>";
957 break;
958 }
959 printk(KERN_INFO "mpic: Setting up MPIC \"%s\" version %s at %lx, max %d CPUs\n",
960 name, vers, phys_addr, mpic->num_cpus);
961 printk(KERN_INFO "mpic: ISU size: %d, shift: %d, mask: %x\n", mpic->isu_size,
962 mpic->isu_shift, mpic->isu_mask);
963
964 mpic->next = mpics;
965 mpics = mpic;
966
967 if (flags & MPIC_PRIMARY) {
968 mpic_primary = mpic;
969 irq_set_default_host(mpic->irqhost);
970 }
971
972 return mpic;
973 }
974
975 void __init mpic_assign_isu(struct mpic *mpic, unsigned int isu_num,
976 unsigned long phys_addr)
977 {
978 unsigned int isu_first = isu_num * mpic->isu_size;
979
980 BUG_ON(isu_num >= MPIC_MAX_ISU);
981
982 mpic->isus[isu_num] = ioremap(phys_addr,
983 MPIC_INFO(IRQ_STRIDE) * mpic->isu_size);
984 if ((isu_first + mpic->isu_size) > mpic->num_sources)
985 mpic->num_sources = isu_first + mpic->isu_size;
986 }
987
988 void __init mpic_set_default_senses(struct mpic *mpic, u8 *senses, int count)
989 {
990 mpic->senses = senses;
991 mpic->senses_count = count;
992 }
993
994 void __init mpic_init(struct mpic *mpic)
995 {
996 int i;
997
998 BUG_ON(mpic->num_sources == 0);
999 WARN_ON(mpic->num_sources > MPIC_VEC_IPI_0);
1000
1001 /* Sanitize source count */
1002 if (mpic->num_sources > MPIC_VEC_IPI_0)
1003 mpic->num_sources = MPIC_VEC_IPI_0;
1004
1005 printk(KERN_INFO "mpic: Initializing for %d sources\n", mpic->num_sources);
1006
1007 /* Set current processor priority to max */
1008 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf);
1009
1010 /* Initialize timers: just disable them all */
1011 for (i = 0; i < 4; i++) {
1012 mpic_write(mpic->tmregs,
1013 i * MPIC_INFO(TIMER_STRIDE) +
1014 MPIC_INFO(TIMER_DESTINATION), 0);
1015 mpic_write(mpic->tmregs,
1016 i * MPIC_INFO(TIMER_STRIDE) +
1017 MPIC_INFO(TIMER_VECTOR_PRI),
1018 MPIC_VECPRI_MASK |
1019 (MPIC_VEC_TIMER_0 + i));
1020 }
1021
1022 /* Initialize IPIs to our reserved vectors and mark them disabled for now */
1023 mpic_test_broken_ipi(mpic);
1024 for (i = 0; i < 4; i++) {
1025 mpic_ipi_write(i,
1026 MPIC_VECPRI_MASK |
1027 (10 << MPIC_VECPRI_PRIORITY_SHIFT) |
1028 (MPIC_VEC_IPI_0 + i));
1029 }
1030
1031 /* Initialize interrupt sources */
1032 if (mpic->irq_count == 0)
1033 mpic->irq_count = mpic->num_sources;
1034
1035 /* Do the HT PIC fixups on U3 broken mpic */
1036 DBG("MPIC flags: %x\n", mpic->flags);
1037 if ((mpic->flags & MPIC_BROKEN_U3) && (mpic->flags & MPIC_PRIMARY))
1038 mpic_scan_ht_pics(mpic);
1039
1040 for (i = 0; i < mpic->num_sources; i++) {
1041 /* start with vector = source number, and masked */
1042 u32 vecpri = MPIC_VECPRI_MASK | i |
1043 (8 << MPIC_VECPRI_PRIORITY_SHIFT);
1044
1045 /* init hw */
1046 mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI), vecpri);
1047 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1048 1 << hard_smp_processor_id());
1049 }
1050
1051 /* Init spurrious vector */
1052 mpic_write(mpic->gregs, MPIC_INFO(GREG_SPURIOUS), MPIC_VEC_SPURRIOUS);
1053
1054 /* Disable 8259 passthrough, if supported */
1055 if (!(mpic->flags & MPIC_NO_PTHROU_DIS))
1056 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1057 mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1058 | MPIC_GREG_GCONF_8259_PTHROU_DIS);
1059
1060 /* Set current processor priority to 0 */
1061 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0);
1062 }
1063
1064 void __init mpic_set_clk_ratio(struct mpic *mpic, u32 clock_ratio)
1065 {
1066 u32 v;
1067
1068 v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1);
1069 v &= ~MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO_MASK;
1070 v |= MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO(clock_ratio);
1071 mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v);
1072 }
1073
1074 void __init mpic_set_serial_int(struct mpic *mpic, int enable)
1075 {
1076 unsigned long flags;
1077 u32 v;
1078
1079 spin_lock_irqsave(&mpic_lock, flags);
1080 v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1);
1081 if (enable)
1082 v |= MPIC_GREG_GLOBAL_CONF_1_SIE;
1083 else
1084 v &= ~MPIC_GREG_GLOBAL_CONF_1_SIE;
1085 mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v);
1086 spin_unlock_irqrestore(&mpic_lock, flags);
1087 }
1088
1089 void mpic_irq_set_priority(unsigned int irq, unsigned int pri)
1090 {
1091 int is_ipi;
1092 struct mpic *mpic = mpic_find(irq, &is_ipi);
1093 unsigned int src = mpic_irq_to_hw(irq);
1094 unsigned long flags;
1095 u32 reg;
1096
1097 spin_lock_irqsave(&mpic_lock, flags);
1098 if (is_ipi) {
1099 reg = mpic_ipi_read(src - MPIC_VEC_IPI_0) &
1100 ~MPIC_VECPRI_PRIORITY_MASK;
1101 mpic_ipi_write(src - MPIC_VEC_IPI_0,
1102 reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
1103 } else {
1104 reg = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI))
1105 & ~MPIC_VECPRI_PRIORITY_MASK;
1106 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
1107 reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
1108 }
1109 spin_unlock_irqrestore(&mpic_lock, flags);
1110 }
1111
1112 unsigned int mpic_irq_get_priority(unsigned int irq)
1113 {
1114 int is_ipi;
1115 struct mpic *mpic = mpic_find(irq, &is_ipi);
1116 unsigned int src = mpic_irq_to_hw(irq);
1117 unsigned long flags;
1118 u32 reg;
1119
1120 spin_lock_irqsave(&mpic_lock, flags);
1121 if (is_ipi)
1122 reg = mpic_ipi_read(src = MPIC_VEC_IPI_0);
1123 else
1124 reg = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI));
1125 spin_unlock_irqrestore(&mpic_lock, flags);
1126 return (reg & MPIC_VECPRI_PRIORITY_MASK) >> MPIC_VECPRI_PRIORITY_SHIFT;
1127 }
1128
1129 void mpic_setup_this_cpu(void)
1130 {
1131 #ifdef CONFIG_SMP
1132 struct mpic *mpic = mpic_primary;
1133 unsigned long flags;
1134 u32 msk = 1 << hard_smp_processor_id();
1135 unsigned int i;
1136
1137 BUG_ON(mpic == NULL);
1138
1139 DBG("%s: setup_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
1140
1141 spin_lock_irqsave(&mpic_lock, flags);
1142
1143 /* let the mpic know we want intrs. default affinity is 0xffffffff
1144 * until changed via /proc. That's how it's done on x86. If we want
1145 * it differently, then we should make sure we also change the default
1146 * values of irq_desc[].affinity in irq.c.
1147 */
1148 if (distribute_irqs) {
1149 for (i = 0; i < mpic->num_sources ; i++)
1150 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1151 mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) | msk);
1152 }
1153
1154 /* Set current processor priority to 0 */
1155 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0);
1156
1157 spin_unlock_irqrestore(&mpic_lock, flags);
1158 #endif /* CONFIG_SMP */
1159 }
1160
1161 int mpic_cpu_get_priority(void)
1162 {
1163 struct mpic *mpic = mpic_primary;
1164
1165 return mpic_cpu_read(MPIC_INFO(CPU_CURRENT_TASK_PRI));
1166 }
1167
1168 void mpic_cpu_set_priority(int prio)
1169 {
1170 struct mpic *mpic = mpic_primary;
1171
1172 prio &= MPIC_CPU_TASKPRI_MASK;
1173 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), prio);
1174 }
1175
1176 /*
1177 * XXX: someone who knows mpic should check this.
1178 * do we need to eoi the ipi including for kexec cpu here (see xics comments)?
1179 * or can we reset the mpic in the new kernel?
1180 */
1181 void mpic_teardown_this_cpu(int secondary)
1182 {
1183 struct mpic *mpic = mpic_primary;
1184 unsigned long flags;
1185 u32 msk = 1 << hard_smp_processor_id();
1186 unsigned int i;
1187
1188 BUG_ON(mpic == NULL);
1189
1190 DBG("%s: teardown_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
1191 spin_lock_irqsave(&mpic_lock, flags);
1192
1193 /* let the mpic know we don't want intrs. */
1194 for (i = 0; i < mpic->num_sources ; i++)
1195 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1196 mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) & ~msk);
1197
1198 /* Set current processor priority to max */
1199 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf);
1200
1201 spin_unlock_irqrestore(&mpic_lock, flags);
1202 }
1203
1204
1205 void mpic_send_ipi(unsigned int ipi_no, unsigned int cpu_mask)
1206 {
1207 struct mpic *mpic = mpic_primary;
1208
1209 BUG_ON(mpic == NULL);
1210
1211 #ifdef DEBUG_IPI
1212 DBG("%s: send_ipi(ipi_no: %d)\n", mpic->name, ipi_no);
1213 #endif
1214
1215 mpic_cpu_write(MPIC_INFO(CPU_IPI_DISPATCH_0) +
1216 ipi_no * MPIC_INFO(CPU_IPI_DISPATCH_STRIDE),
1217 mpic_physmask(cpu_mask & cpus_addr(cpu_online_map)[0]));
1218 }
1219
1220 unsigned int mpic_get_one_irq(struct mpic *mpic)
1221 {
1222 u32 src;
1223
1224 src = mpic_cpu_read(MPIC_INFO(CPU_INTACK)) & MPIC_INFO(VECPRI_VECTOR_MASK);
1225 #ifdef DEBUG_LOW
1226 DBG("%s: get_one_irq(): %d\n", mpic->name, src);
1227 #endif
1228 if (unlikely(src == MPIC_VEC_SPURRIOUS))
1229 return NO_IRQ;
1230 return irq_linear_revmap(mpic->irqhost, src);
1231 }
1232
1233 unsigned int mpic_get_irq(void)
1234 {
1235 struct mpic *mpic = mpic_primary;
1236
1237 BUG_ON(mpic == NULL);
1238
1239 return mpic_get_one_irq(mpic);
1240 }
1241
1242
1243 #ifdef CONFIG_SMP
1244 void mpic_request_ipis(void)
1245 {
1246 struct mpic *mpic = mpic_primary;
1247 int i;
1248 static char *ipi_names[] = {
1249 "IPI0 (call function)",
1250 "IPI1 (reschedule)",
1251 "IPI2 (unused)",
1252 "IPI3 (debugger break)",
1253 };
1254 BUG_ON(mpic == NULL);
1255
1256 printk(KERN_INFO "mpic: requesting IPIs ... \n");
1257
1258 for (i = 0; i < 4; i++) {
1259 unsigned int vipi = irq_create_mapping(mpic->irqhost,
1260 MPIC_VEC_IPI_0 + i);
1261 if (vipi == NO_IRQ) {
1262 printk(KERN_ERR "Failed to map IPI %d\n", i);
1263 break;
1264 }
1265 request_irq(vipi, mpic_ipi_action, IRQF_DISABLED,
1266 ipi_names[i], mpic);
1267 }
1268 }
1269
1270 void smp_mpic_message_pass(int target, int msg)
1271 {
1272 /* make sure we're sending something that translates to an IPI */
1273 if ((unsigned int)msg > 3) {
1274 printk("SMP %d: smp_message_pass: unknown msg %d\n",
1275 smp_processor_id(), msg);
1276 return;
1277 }
1278 switch (target) {
1279 case MSG_ALL:
1280 mpic_send_ipi(msg, 0xffffffff);
1281 break;
1282 case MSG_ALL_BUT_SELF:
1283 mpic_send_ipi(msg, 0xffffffff & ~(1 << smp_processor_id()));
1284 break;
1285 default:
1286 mpic_send_ipi(msg, 1 << target);
1287 break;
1288 }
1289 }
1290 #endif /* CONFIG_SMP */
CRIS linux kernel tree