2 * arch/ppc64/kernel/mpic.c
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.
8 * Copyright (C) 2004 Benjamin Herrenschmidt, IBM Corp.
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
17 #include <linux/config.h>
18 #include <linux/types.h>
19 #include <linux/kernel.h>
20 #include <linux/init.h>
21 #include <linux/irq.h>
22 #include <linux/smp.h>
23 #include <linux/interrupt.h>
24 #include <linux/bootmem.h>
25 #include <linux/spinlock.h>
26 #include <linux/pci.h>
28 #include <asm/ptrace.h>
29 #include <asm/signal.h>
31 #include <asm/pgtable.h>
33 #include <asm/machdep.h>
38 #define DBG(fmt...) printk(fmt)
43 static struct mpic *mpics;
44 static struct mpic *mpic_primary;
45 static DEFINE_SPINLOCK(mpic_lock);
49 * Register accessor functions
53 static inline u32 _mpic_read(unsigned int be, volatile u32 __iomem *base,
57 return in_be32(base + (reg >> 2));
59 return in_le32(base + (reg >> 2));
62 static inline void _mpic_write(unsigned int be, volatile u32 __iomem *base,
63 unsigned int reg, u32 value)
66 out_be32(base + (reg >> 2), value);
68 out_le32(base + (reg >> 2), value);
71 static inline u32 _mpic_ipi_read(struct mpic *mpic, unsigned int ipi)
73 unsigned int be = (mpic->flags & MPIC_BIG_ENDIAN) != 0;
74 unsigned int offset = MPIC_GREG_IPI_VECTOR_PRI_0 + (ipi * 0x10);
76 if (mpic->flags & MPIC_BROKEN_IPI)
78 return _mpic_read(be, mpic->gregs, offset);
81 static inline void _mpic_ipi_write(struct mpic *mpic, unsigned int ipi, u32 value)
83 unsigned int offset = MPIC_GREG_IPI_VECTOR_PRI_0 + (ipi * 0x10);
85 _mpic_write(mpic->flags & MPIC_BIG_ENDIAN, mpic->gregs, offset, value);
88 static inline u32 _mpic_cpu_read(struct mpic *mpic, unsigned int reg)
92 if (mpic->flags & MPIC_PRIMARY)
93 cpu = hard_smp_processor_id();
95 return _mpic_read(mpic->flags & MPIC_BIG_ENDIAN, mpic->cpuregs[cpu], reg);
98 static inline void _mpic_cpu_write(struct mpic *mpic, unsigned int reg, u32 value)
100 unsigned int cpu = 0;
102 if (mpic->flags & MPIC_PRIMARY)
103 cpu = hard_smp_processor_id();
105 _mpic_write(mpic->flags & MPIC_BIG_ENDIAN, mpic->cpuregs[cpu], reg, value);
108 static inline u32 _mpic_irq_read(struct mpic *mpic, unsigned int src_no, unsigned int reg)
110 unsigned int isu = src_no >> mpic->isu_shift;
111 unsigned int idx = src_no & mpic->isu_mask;
113 return _mpic_read(mpic->flags & MPIC_BIG_ENDIAN, mpic->isus[isu],
114 reg + (idx * MPIC_IRQ_STRIDE));
117 static inline void _mpic_irq_write(struct mpic *mpic, unsigned int src_no,
118 unsigned int reg, u32 value)
120 unsigned int isu = src_no >> mpic->isu_shift;
121 unsigned int idx = src_no & mpic->isu_mask;
123 _mpic_write(mpic->flags & MPIC_BIG_ENDIAN, mpic->isus[isu],
124 reg + (idx * MPIC_IRQ_STRIDE), value);
127 #define mpic_read(b,r) _mpic_read(mpic->flags & MPIC_BIG_ENDIAN,(b),(r))
128 #define mpic_write(b,r,v) _mpic_write(mpic->flags & MPIC_BIG_ENDIAN,(b),(r),(v))
129 #define mpic_ipi_read(i) _mpic_ipi_read(mpic,(i))
130 #define mpic_ipi_write(i,v) _mpic_ipi_write(mpic,(i),(v))
131 #define mpic_cpu_read(i) _mpic_cpu_read(mpic,(i))
132 #define mpic_cpu_write(i,v) _mpic_cpu_write(mpic,(i),(v))
133 #define mpic_irq_read(s,r) _mpic_irq_read(mpic,(s),(r))
134 #define mpic_irq_write(s,r,v) _mpic_irq_write(mpic,(s),(r),(v))
138 * Low level utility functions
143 /* Check if we have one of those nice broken MPICs with a flipped endian on
144 * reads from IPI registers
146 static void __init mpic_test_broken_ipi(struct mpic *mpic)
150 mpic_write(mpic->gregs, MPIC_GREG_IPI_VECTOR_PRI_0, MPIC_VECPRI_MASK);
151 r = mpic_read(mpic->gregs, MPIC_GREG_IPI_VECTOR_PRI_0);
153 if (r == le32_to_cpu(MPIC_VECPRI_MASK)) {
154 printk(KERN_INFO "mpic: Detected reversed IPI registers\n");
155 mpic->flags |= MPIC_BROKEN_IPI;
159 #ifdef CONFIG_MPIC_BROKEN_U3
161 /* Test if an interrupt is sourced from HyperTransport (used on broken U3s)
162 * to force the edge setting on the MPIC and do the ack workaround.
164 static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source_no)
166 if (source_no >= 128 || !mpic->fixups)
168 return mpic->fixups[source_no].base != NULL;
171 static inline void mpic_apic_end_irq(struct mpic *mpic, unsigned int source_no)
173 struct mpic_irq_fixup *fixup = &mpic->fixups[source_no];
176 spin_lock(&mpic->fixup_lock);
177 writeb(0x11 + 2 * fixup->irq, fixup->base);
178 tmp = readl(fixup->base + 2);
179 writel(tmp | 0x80000000ul, fixup->base + 2);
180 /* config writes shouldn't be posted but let's be safe ... */
181 (void)readl(fixup->base + 2);
182 spin_unlock(&mpic->fixup_lock);
186 static void __init mpic_amd8111_read_irq(struct mpic *mpic, u8 __iomem *devbase)
191 printk(KERN_INFO "mpic: - Workarounds on AMD 8111 @ %p\n", devbase);
193 for (i=0; i < 24; i++) {
194 writeb(0x10 + 2*i, devbase + 0xf2);
195 tmp = readl(devbase + 0xf4);
196 if ((tmp & 0x1) || !(tmp & 0x20))
198 irq = (tmp >> 16) & 0xff;
199 mpic->fixups[irq].irq = i;
200 mpic->fixups[irq].base = devbase + 0xf2;
204 static void __init mpic_amd8131_read_irq(struct mpic *mpic, u8 __iomem *devbase)
209 printk(KERN_INFO "mpic: - Workarounds on AMD 8131 @ %p\n", devbase);
211 for (i=0; i < 4; i++) {
212 writeb(0x10 + 2*i, devbase + 0xba);
213 tmp = readl(devbase + 0xbc);
214 if ((tmp & 0x1) || !(tmp & 0x20))
216 irq = (tmp >> 16) & 0xff;
217 mpic->fixups[irq].irq = i;
218 mpic->fixups[irq].base = devbase + 0xba;
222 static void __init mpic_scan_ioapics(struct mpic *mpic)
225 u8 __iomem *cfgspace;
227 printk(KERN_INFO "mpic: Setting up IO-APICs workarounds for U3\n");
229 /* Allocate fixups array */
230 mpic->fixups = alloc_bootmem(128 * sizeof(struct mpic_irq_fixup));
231 BUG_ON(mpic->fixups == NULL);
232 memset(mpic->fixups, 0, 128 * sizeof(struct mpic_irq_fixup));
235 spin_lock_init(&mpic->fixup_lock);
237 /* Map u3 config space. We assume all IO-APICs are on the primary bus
238 * and slot will never be above "0xf" so we only need to map 32k
240 cfgspace = (unsigned char __iomem *)ioremap(0xf2000000, 0x8000);
241 BUG_ON(cfgspace == NULL);
243 /* Now we scan all slots. We do a very quick scan, we read the header type,
244 * vendor ID and device ID only, that's plenty enough
246 for (devfn = 0; devfn < PCI_DEVFN(0x10,0); devfn ++) {
247 u8 __iomem *devbase = cfgspace + (devfn << 8);
248 u8 hdr_type = readb(devbase + PCI_HEADER_TYPE);
249 u32 l = readl(devbase + PCI_VENDOR_ID);
250 u16 vendor_id, device_id;
253 DBG("devfn %x, l: %x\n", devfn, l);
255 /* If no device, skip */
256 if (l == 0xffffffff || l == 0x00000000 ||
257 l == 0x0000ffff || l == 0xffff0000)
260 /* Check if it's a multifunction device (only really used
261 * to function 0 though
263 multifunc = !!(hdr_type & 0x80);
264 vendor_id = l & 0xffff;
265 device_id = (l >> 16) & 0xffff;
267 /* If a known device, go to fixup setup code */
268 if (vendor_id == PCI_VENDOR_ID_AMD && device_id == 0x7460)
269 mpic_amd8111_read_irq(mpic, devbase);
270 if (vendor_id == PCI_VENDOR_ID_AMD && device_id == 0x7450)
271 mpic_amd8131_read_irq(mpic, devbase);
273 /* next device, if function 0 */
274 if ((PCI_FUNC(devfn) == 0) && !multifunc)
279 #endif /* CONFIG_MPIC_BROKEN_U3 */
282 /* Find an mpic associated with a given linux interrupt */
283 static struct mpic *mpic_find(unsigned int irq, unsigned int *is_ipi)
285 struct mpic *mpic = mpics;
288 /* search IPIs first since they may override the main interrupts */
289 if (irq >= mpic->ipi_offset && irq < (mpic->ipi_offset + 4)) {
294 if (irq >= mpic->irq_offset &&
295 irq < (mpic->irq_offset + mpic->irq_count)) {
305 /* Convert a cpu mask from logical to physical cpu numbers. */
306 static inline u32 mpic_physmask(u32 cpumask)
311 for (i = 0; i < NR_CPUS; ++i, cpumask >>= 1)
312 mask |= (cpumask & 1) << get_hard_smp_processor_id(i);
317 /* Get the mpic structure from the IPI number */
318 static inline struct mpic * mpic_from_ipi(unsigned int ipi)
320 return container_of(irq_desc[ipi].handler, struct mpic, hc_ipi);
324 /* Get the mpic structure from the irq number */
325 static inline struct mpic * mpic_from_irq(unsigned int irq)
327 return container_of(irq_desc[irq].handler, struct mpic, hc_irq);
331 static inline void mpic_eoi(struct mpic *mpic)
333 mpic_cpu_write(MPIC_CPU_EOI, 0);
334 (void)mpic_cpu_read(MPIC_CPU_WHOAMI);
338 static irqreturn_t mpic_ipi_action(int irq, void *dev_id, struct pt_regs *regs)
340 struct mpic *mpic = dev_id;
342 smp_message_recv(irq - mpic->ipi_offset, regs);
345 #endif /* CONFIG_SMP */
348 * Linux descriptor level callbacks
352 static void mpic_enable_irq(unsigned int irq)
354 unsigned int loops = 100000;
355 struct mpic *mpic = mpic_from_irq(irq);
356 unsigned int src = irq - mpic->irq_offset;
358 DBG("%s: enable_irq: %d (src %d)\n", mpic->name, irq, src);
360 mpic_irq_write(src, MPIC_IRQ_VECTOR_PRI,
361 mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI) & ~MPIC_VECPRI_MASK);
363 /* make sure mask gets to controller before we return to user */
366 printk(KERN_ERR "mpic_enable_irq timeout\n");
369 } while(mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI) & MPIC_VECPRI_MASK);
372 static void mpic_disable_irq(unsigned int irq)
374 unsigned int loops = 100000;
375 struct mpic *mpic = mpic_from_irq(irq);
376 unsigned int src = irq - mpic->irq_offset;
378 DBG("%s: disable_irq: %d (src %d)\n", mpic->name, irq, src);
380 mpic_irq_write(src, MPIC_IRQ_VECTOR_PRI,
381 mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI) | MPIC_VECPRI_MASK);
383 /* make sure mask gets to controller before we return to user */
386 printk(KERN_ERR "mpic_enable_irq timeout\n");
389 } while(!(mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI) & MPIC_VECPRI_MASK));
392 static void mpic_end_irq(unsigned int irq)
394 struct mpic *mpic = mpic_from_irq(irq);
396 DBG("%s: end_irq: %d\n", mpic->name, irq);
398 /* We always EOI on end_irq() even for edge interrupts since that
399 * should only lower the priority, the MPIC should have properly
400 * latched another edge interrupt coming in anyway
403 #ifdef CONFIG_MPIC_BROKEN_U3
404 if (mpic->flags & MPIC_BROKEN_U3) {
405 unsigned int src = irq - mpic->irq_offset;
406 if (mpic_is_ht_interrupt(mpic, src))
407 mpic_apic_end_irq(mpic, src);
409 #endif /* CONFIG_MPIC_BROKEN_U3 */
416 static void mpic_enable_ipi(unsigned int irq)
418 struct mpic *mpic = mpic_from_ipi(irq);
419 unsigned int src = irq - mpic->ipi_offset;
421 DBG("%s: enable_ipi: %d (ipi %d)\n", mpic->name, irq, src);
422 mpic_ipi_write(src, mpic_ipi_read(src) & ~MPIC_VECPRI_MASK);
425 static void mpic_disable_ipi(unsigned int irq)
427 /* NEVER disable an IPI... that's just plain wrong! */
430 static void mpic_end_ipi(unsigned int irq)
432 struct mpic *mpic = mpic_from_ipi(irq);
435 * IPIs are marked IRQ_PER_CPU. This has the side effect of
436 * preventing the IRQ_PENDING/IRQ_INPROGRESS logic from
437 * applying to them. We EOI them late to avoid re-entering.
438 * We mark IPI's with SA_INTERRUPT as they must run with
444 #endif /* CONFIG_SMP */
446 static void mpic_set_affinity(unsigned int irq, cpumask_t cpumask)
448 struct mpic *mpic = mpic_from_irq(irq);
452 cpus_and(tmp, cpumask, cpu_online_map);
454 mpic_irq_write(irq - mpic->irq_offset, MPIC_IRQ_DESTINATION,
455 mpic_physmask(cpus_addr(tmp)[0]));
464 struct mpic * __init mpic_alloc(unsigned long phys_addr,
466 unsigned int isu_size,
467 unsigned int irq_offset,
468 unsigned int irq_count,
469 unsigned int ipi_offset,
470 unsigned char *senses,
471 unsigned int senses_count,
479 mpic = alloc_bootmem(sizeof(struct mpic));
483 memset(mpic, 0, sizeof(struct mpic));
486 mpic->hc_irq.typename = name;
487 mpic->hc_irq.enable = mpic_enable_irq;
488 mpic->hc_irq.disable = mpic_disable_irq;
489 mpic->hc_irq.end = mpic_end_irq;
490 if (flags & MPIC_PRIMARY)
491 mpic->hc_irq.set_affinity = mpic_set_affinity;
493 mpic->hc_ipi.typename = name;
494 mpic->hc_ipi.enable = mpic_enable_ipi;
495 mpic->hc_ipi.disable = mpic_disable_ipi;
496 mpic->hc_ipi.end = mpic_end_ipi;
497 #endif /* CONFIG_SMP */
500 mpic->isu_size = isu_size;
501 mpic->irq_offset = irq_offset;
502 mpic->irq_count = irq_count;
503 mpic->ipi_offset = ipi_offset;
504 mpic->num_sources = 0; /* so far */
505 mpic->senses = senses;
506 mpic->senses_count = senses_count;
508 /* Map the global registers */
509 mpic->gregs = ioremap(phys_addr + MPIC_GREG_BASE, 0x1000);
510 mpic->tmregs = mpic->gregs + (MPIC_TIMER_BASE >> 2);
511 BUG_ON(mpic->gregs == NULL);
514 if (flags & MPIC_WANTS_RESET) {
515 mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_0,
516 mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_0)
517 | MPIC_GREG_GCONF_RESET);
518 while( mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_0)
519 & MPIC_GREG_GCONF_RESET)
523 /* Read feature register, calculate num CPUs and, for non-ISU
524 * MPICs, num sources as well. On ISU MPICs, sources are counted
527 reg = mpic_read(mpic->gregs, MPIC_GREG_FEATURE_0);
528 mpic->num_cpus = ((reg & MPIC_GREG_FEATURE_LAST_CPU_MASK)
529 >> MPIC_GREG_FEATURE_LAST_CPU_SHIFT) + 1;
531 mpic->num_sources = ((reg & MPIC_GREG_FEATURE_LAST_SRC_MASK)
532 >> MPIC_GREG_FEATURE_LAST_SRC_SHIFT) + 1;
534 /* Map the per-CPU registers */
535 for (i = 0; i < mpic->num_cpus; i++) {
536 mpic->cpuregs[i] = ioremap(phys_addr + MPIC_CPU_BASE +
537 i * MPIC_CPU_STRIDE, 0x1000);
538 BUG_ON(mpic->cpuregs[i] == NULL);
541 /* Initialize main ISU if none provided */
542 if (mpic->isu_size == 0) {
543 mpic->isu_size = mpic->num_sources;
544 mpic->isus[0] = ioremap(phys_addr + MPIC_IRQ_BASE,
545 MPIC_IRQ_STRIDE * mpic->isu_size);
546 BUG_ON(mpic->isus[0] == NULL);
548 mpic->isu_shift = 1 + __ilog2(mpic->isu_size - 1);
549 mpic->isu_mask = (1 << mpic->isu_shift) - 1;
551 /* Display version */
552 switch (reg & MPIC_GREG_FEATURE_VERSION_MASK) {
566 printk(KERN_INFO "mpic: Setting up MPIC \"%s\" version %s at %lx, max %d CPUs\n",
567 name, vers, phys_addr, mpic->num_cpus);
568 printk(KERN_INFO "mpic: ISU size: %d, shift: %d, mask: %x\n", mpic->isu_size,
569 mpic->isu_shift, mpic->isu_mask);
574 if (flags & MPIC_PRIMARY)
580 void __init mpic_assign_isu(struct mpic *mpic, unsigned int isu_num,
581 unsigned long phys_addr)
583 unsigned int isu_first = isu_num * mpic->isu_size;
585 BUG_ON(isu_num >= MPIC_MAX_ISU);
587 mpic->isus[isu_num] = ioremap(phys_addr, MPIC_IRQ_STRIDE * mpic->isu_size);
588 if ((isu_first + mpic->isu_size) > mpic->num_sources)
589 mpic->num_sources = isu_first + mpic->isu_size;
592 void __init mpic_setup_cascade(unsigned int irq, mpic_cascade_t handler,
595 struct mpic *mpic = mpic_find(irq, NULL);
598 /* Synchronization here is a bit dodgy, so don't try to replace cascade
599 * interrupts on the fly too often ... but normally it's set up at boot.
601 spin_lock_irqsave(&mpic_lock, flags);
603 mpic_disable_irq(mpic->cascade_vec + mpic->irq_offset);
604 mpic->cascade = NULL;
606 mpic->cascade_vec = irq - mpic->irq_offset;
607 mpic->cascade_data = data;
609 mpic->cascade = handler;
610 mpic_enable_irq(irq);
611 spin_unlock_irqrestore(&mpic_lock, flags);
614 void __init mpic_init(struct mpic *mpic)
618 BUG_ON(mpic->num_sources == 0);
620 printk(KERN_INFO "mpic: Initializing for %d sources\n", mpic->num_sources);
622 /* Set current processor priority to max */
623 mpic_cpu_write(MPIC_CPU_CURRENT_TASK_PRI, 0xf);
625 /* Initialize timers: just disable them all */
626 for (i = 0; i < 4; i++) {
627 mpic_write(mpic->tmregs,
628 i * MPIC_TIMER_STRIDE + MPIC_TIMER_DESTINATION, 0);
629 mpic_write(mpic->tmregs,
630 i * MPIC_TIMER_STRIDE + MPIC_TIMER_VECTOR_PRI,
632 (MPIC_VEC_TIMER_0 + i));
635 /* Initialize IPIs to our reserved vectors and mark them disabled for now */
636 mpic_test_broken_ipi(mpic);
637 for (i = 0; i < 4; i++) {
640 (10 << MPIC_VECPRI_PRIORITY_SHIFT) |
641 (MPIC_VEC_IPI_0 + i));
643 if (!(mpic->flags & MPIC_PRIMARY))
645 irq_desc[mpic->ipi_offset+i].status |= IRQ_PER_CPU;
646 irq_desc[mpic->ipi_offset+i].handler = &mpic->hc_ipi;
648 #endif /* CONFIG_SMP */
651 /* Initialize interrupt sources */
652 if (mpic->irq_count == 0)
653 mpic->irq_count = mpic->num_sources;
655 #ifdef CONFIG_MPIC_BROKEN_U3
656 /* Do the ioapic fixups on U3 broken mpic */
657 DBG("MPIC flags: %x\n", mpic->flags);
658 if ((mpic->flags & MPIC_BROKEN_U3) && (mpic->flags & MPIC_PRIMARY))
659 mpic_scan_ioapics(mpic);
660 #endif /* CONFIG_MPIC_BROKEN_U3 */
662 for (i = 0; i < mpic->num_sources; i++) {
663 /* start with vector = source number, and masked */
664 u32 vecpri = MPIC_VECPRI_MASK | i | (8 << MPIC_VECPRI_PRIORITY_SHIFT);
667 /* if it's an IPI, we skip it */
668 if ((mpic->irq_offset + i) >= (mpic->ipi_offset + i) &&
669 (mpic->irq_offset + i) < (mpic->ipi_offset + i + 4))
672 /* do senses munging */
673 if (mpic->senses && i < mpic->senses_count) {
674 if (mpic->senses[i] & IRQ_SENSE_LEVEL)
675 vecpri |= MPIC_VECPRI_SENSE_LEVEL;
676 if (mpic->senses[i] & IRQ_POLARITY_POSITIVE)
677 vecpri |= MPIC_VECPRI_POLARITY_POSITIVE;
679 vecpri |= MPIC_VECPRI_SENSE_LEVEL;
681 /* remember if it was a level interrupts */
682 level = (vecpri & MPIC_VECPRI_SENSE_LEVEL);
684 /* deal with broken U3 */
685 if (mpic->flags & MPIC_BROKEN_U3) {
686 #ifdef CONFIG_MPIC_BROKEN_U3
687 if (mpic_is_ht_interrupt(mpic, i)) {
688 vecpri &= ~(MPIC_VECPRI_SENSE_MASK |
689 MPIC_VECPRI_POLARITY_MASK);
690 vecpri |= MPIC_VECPRI_POLARITY_POSITIVE;
693 printk(KERN_ERR "mpic: BROKEN_U3 set, but CONFIG doesn't match\n");
697 DBG("setup source %d, vecpri: %08x, level: %d\n", i, vecpri,
701 mpic_irq_write(i, MPIC_IRQ_VECTOR_PRI, vecpri);
702 mpic_irq_write(i, MPIC_IRQ_DESTINATION,
703 1 << get_hard_smp_processor_id(boot_cpuid));
705 /* init linux descriptors */
706 if (i < mpic->irq_count) {
707 irq_desc[mpic->irq_offset+i].status = level ? IRQ_LEVEL : 0;
708 irq_desc[mpic->irq_offset+i].handler = &mpic->hc_irq;
712 /* Init spurrious vector */
713 mpic_write(mpic->gregs, MPIC_GREG_SPURIOUS, MPIC_VEC_SPURRIOUS);
715 /* Disable 8259 passthrough */
716 mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_0,
717 mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_0)
718 | MPIC_GREG_GCONF_8259_PTHROU_DIS);
720 /* Set current processor priority to 0 */
721 mpic_cpu_write(MPIC_CPU_CURRENT_TASK_PRI, 0);
726 void mpic_irq_set_priority(unsigned int irq, unsigned int pri)
729 struct mpic *mpic = mpic_find(irq, &is_ipi);
733 spin_lock_irqsave(&mpic_lock, flags);
735 reg = mpic_ipi_read(irq - mpic->ipi_offset) & MPIC_VECPRI_PRIORITY_MASK;
736 mpic_ipi_write(irq - mpic->ipi_offset,
737 reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
739 reg = mpic_irq_read(irq - mpic->irq_offset, MPIC_IRQ_VECTOR_PRI)
740 & MPIC_VECPRI_PRIORITY_MASK;
741 mpic_irq_write(irq - mpic->irq_offset, MPIC_IRQ_VECTOR_PRI,
742 reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
744 spin_unlock_irqrestore(&mpic_lock, flags);
747 unsigned int mpic_irq_get_priority(unsigned int irq)
750 struct mpic *mpic = mpic_find(irq, &is_ipi);
754 spin_lock_irqsave(&mpic_lock, flags);
756 reg = mpic_ipi_read(irq - mpic->ipi_offset);
758 reg = mpic_irq_read(irq - mpic->irq_offset, MPIC_IRQ_VECTOR_PRI);
759 spin_unlock_irqrestore(&mpic_lock, flags);
760 return (reg & MPIC_VECPRI_PRIORITY_MASK) >> MPIC_VECPRI_PRIORITY_SHIFT;
763 void mpic_setup_this_cpu(void)
766 struct mpic *mpic = mpic_primary;
768 u32 msk = 1 << hard_smp_processor_id();
771 BUG_ON(mpic == NULL);
773 DBG("%s: setup_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
775 spin_lock_irqsave(&mpic_lock, flags);
777 /* let the mpic know we want intrs. default affinity is 0xffffffff
778 * until changed via /proc. That's how it's done on x86. If we want
779 * it differently, then we should make sure we also change the default
780 * values of irq_affinity in irq.c.
782 if (distribute_irqs) {
783 for (i = 0; i < mpic->num_sources ; i++)
784 mpic_irq_write(i, MPIC_IRQ_DESTINATION,
785 mpic_irq_read(i, MPIC_IRQ_DESTINATION) | msk);
788 /* Set current processor priority to 0 */
789 mpic_cpu_write(MPIC_CPU_CURRENT_TASK_PRI, 0);
791 spin_unlock_irqrestore(&mpic_lock, flags);
792 #endif /* CONFIG_SMP */
796 * XXX: someone who knows mpic should check this.
797 * do we need to eoi the ipi including for kexec cpu here (see xics comments)?
798 * or can we reset the mpic in the new kernel?
800 void mpic_teardown_this_cpu(int secondary)
802 struct mpic *mpic = mpic_primary;
804 u32 msk = 1 << hard_smp_processor_id();
807 BUG_ON(mpic == NULL);
809 DBG("%s: teardown_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
810 spin_lock_irqsave(&mpic_lock, flags);
812 /* let the mpic know we don't want intrs. */
813 for (i = 0; i < mpic->num_sources ; i++)
814 mpic_irq_write(i, MPIC_IRQ_DESTINATION,
815 mpic_irq_read(i, MPIC_IRQ_DESTINATION) & ~msk);
817 /* Set current processor priority to max */
818 mpic_cpu_write(MPIC_CPU_CURRENT_TASK_PRI, 0xf);
820 spin_unlock_irqrestore(&mpic_lock, flags);
824 void mpic_send_ipi(unsigned int ipi_no, unsigned int cpu_mask)
826 struct mpic *mpic = mpic_primary;
828 BUG_ON(mpic == NULL);
830 DBG("%s: send_ipi(ipi_no: %d)\n", mpic->name, ipi_no);
832 mpic_cpu_write(MPIC_CPU_IPI_DISPATCH_0 + ipi_no * 0x10,
833 mpic_physmask(cpu_mask & cpus_addr(cpu_online_map)[0]));
836 int mpic_get_one_irq(struct mpic *mpic, struct pt_regs *regs)
840 irq = mpic_cpu_read(MPIC_CPU_INTACK) & MPIC_VECPRI_VECTOR_MASK;
841 DBG("%s: get_one_irq(): %d\n", mpic->name, irq);
843 if (mpic->cascade && irq == mpic->cascade_vec) {
844 DBG("%s: cascading ...\n", mpic->name);
845 irq = mpic->cascade(regs, mpic->cascade_data);
849 if (unlikely(irq == MPIC_VEC_SPURRIOUS))
851 if (irq < MPIC_VEC_IPI_0)
852 return irq + mpic->irq_offset;
853 DBG("%s: ipi %d !\n", mpic->name, irq - MPIC_VEC_IPI_0);
854 return irq - MPIC_VEC_IPI_0 + mpic->ipi_offset;
857 int mpic_get_irq(struct pt_regs *regs)
859 struct mpic *mpic = mpic_primary;
861 BUG_ON(mpic == NULL);
863 return mpic_get_one_irq(mpic, regs);
868 void mpic_request_ipis(void)
870 struct mpic *mpic = mpic_primary;
872 BUG_ON(mpic == NULL);
874 printk("requesting IPIs ... \n");
876 /* IPIs are marked SA_INTERRUPT as they must run with irqs disabled */
877 request_irq(mpic->ipi_offset+0, mpic_ipi_action, SA_INTERRUPT,
878 "IPI0 (call function)", mpic);
879 request_irq(mpic->ipi_offset+1, mpic_ipi_action, SA_INTERRUPT,
880 "IPI1 (reschedule)", mpic);
881 request_irq(mpic->ipi_offset+2, mpic_ipi_action, SA_INTERRUPT,
882 "IPI2 (unused)", mpic);
883 request_irq(mpic->ipi_offset+3, mpic_ipi_action, SA_INTERRUPT,
884 "IPI3 (debugger break)", mpic);
886 printk("IPIs requested... \n");
888 #endif /* CONFIG_SMP */