2 * arch/powerpc/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
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>
30 #include <asm/ptrace.h>
31 #include <asm/signal.h>
33 #include <asm/pgtable.h>
35 #include <asm/machdep.h>
40 #define DBG(fmt...) printk(fmt)
45 static struct mpic *mpics;
46 static struct mpic *mpic_primary;
47 static DEFINE_SPINLOCK(mpic_lock);
49 #ifdef CONFIG_PPC32 /* XXX for now */
50 #ifdef CONFIG_IRQ_ALL_CPUS
51 #define distribute_irqs (1)
53 #define distribute_irqs (0)
58 * Register accessor functions
62 static inline u32 _mpic_read(unsigned int be, volatile u32 __iomem *base,
66 return in_be32(base + (reg >> 2));
68 return in_le32(base + (reg >> 2));
71 static inline void _mpic_write(unsigned int be, volatile u32 __iomem *base,
72 unsigned int reg, u32 value)
75 out_be32(base + (reg >> 2), value);
77 out_le32(base + (reg >> 2), value);
80 static inline u32 _mpic_ipi_read(struct mpic *mpic, unsigned int ipi)
82 unsigned int be = (mpic->flags & MPIC_BIG_ENDIAN) != 0;
83 unsigned int offset = MPIC_GREG_IPI_VECTOR_PRI_0 + (ipi * 0x10);
85 if (mpic->flags & MPIC_BROKEN_IPI)
87 return _mpic_read(be, mpic->gregs, offset);
90 static inline void _mpic_ipi_write(struct mpic *mpic, unsigned int ipi, u32 value)
92 unsigned int offset = MPIC_GREG_IPI_VECTOR_PRI_0 + (ipi * 0x10);
94 _mpic_write(mpic->flags & MPIC_BIG_ENDIAN, mpic->gregs, offset, value);
97 static inline u32 _mpic_cpu_read(struct mpic *mpic, unsigned int reg)
101 if (mpic->flags & MPIC_PRIMARY)
102 cpu = hard_smp_processor_id();
104 return _mpic_read(mpic->flags & MPIC_BIG_ENDIAN, mpic->cpuregs[cpu], reg);
107 static inline void _mpic_cpu_write(struct mpic *mpic, unsigned int reg, u32 value)
109 unsigned int cpu = 0;
111 if (mpic->flags & MPIC_PRIMARY)
112 cpu = hard_smp_processor_id();
114 _mpic_write(mpic->flags & MPIC_BIG_ENDIAN, mpic->cpuregs[cpu], reg, value);
117 static inline u32 _mpic_irq_read(struct mpic *mpic, unsigned int src_no, unsigned int reg)
119 unsigned int isu = src_no >> mpic->isu_shift;
120 unsigned int idx = src_no & mpic->isu_mask;
122 return _mpic_read(mpic->flags & MPIC_BIG_ENDIAN, mpic->isus[isu],
123 reg + (idx * MPIC_IRQ_STRIDE));
126 static inline void _mpic_irq_write(struct mpic *mpic, unsigned int src_no,
127 unsigned int reg, u32 value)
129 unsigned int isu = src_no >> mpic->isu_shift;
130 unsigned int idx = src_no & mpic->isu_mask;
132 _mpic_write(mpic->flags & MPIC_BIG_ENDIAN, mpic->isus[isu],
133 reg + (idx * MPIC_IRQ_STRIDE), value);
136 #define mpic_read(b,r) _mpic_read(mpic->flags & MPIC_BIG_ENDIAN,(b),(r))
137 #define mpic_write(b,r,v) _mpic_write(mpic->flags & MPIC_BIG_ENDIAN,(b),(r),(v))
138 #define mpic_ipi_read(i) _mpic_ipi_read(mpic,(i))
139 #define mpic_ipi_write(i,v) _mpic_ipi_write(mpic,(i),(v))
140 #define mpic_cpu_read(i) _mpic_cpu_read(mpic,(i))
141 #define mpic_cpu_write(i,v) _mpic_cpu_write(mpic,(i),(v))
142 #define mpic_irq_read(s,r) _mpic_irq_read(mpic,(s),(r))
143 #define mpic_irq_write(s,r,v) _mpic_irq_write(mpic,(s),(r),(v))
147 * Low level utility functions
152 /* Check if we have one of those nice broken MPICs with a flipped endian on
153 * reads from IPI registers
155 static void __init mpic_test_broken_ipi(struct mpic *mpic)
159 mpic_write(mpic->gregs, MPIC_GREG_IPI_VECTOR_PRI_0, MPIC_VECPRI_MASK);
160 r = mpic_read(mpic->gregs, MPIC_GREG_IPI_VECTOR_PRI_0);
162 if (r == le32_to_cpu(MPIC_VECPRI_MASK)) {
163 printk(KERN_INFO "mpic: Detected reversed IPI registers\n");
164 mpic->flags |= MPIC_BROKEN_IPI;
168 #ifdef CONFIG_MPIC_BROKEN_U3
170 /* Test if an interrupt is sourced from HyperTransport (used on broken U3s)
171 * to force the edge setting on the MPIC and do the ack workaround.
173 static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source)
175 if (source >= 128 || !mpic->fixups)
177 return mpic->fixups[source].base != NULL;
181 static inline void mpic_ht_end_irq(struct mpic *mpic, unsigned int source)
183 struct mpic_irq_fixup *fixup = &mpic->fixups[source];
185 if (fixup->applebase) {
186 unsigned int soff = (fixup->index >> 3) & ~3;
187 unsigned int mask = 1U << (fixup->index & 0x1f);
188 writel(mask, fixup->applebase + soff);
190 spin_lock(&mpic->fixup_lock);
191 writeb(0x11 + 2 * fixup->index, fixup->base + 2);
192 writel(fixup->data, fixup->base + 4);
193 spin_unlock(&mpic->fixup_lock);
197 static void mpic_startup_ht_interrupt(struct mpic *mpic, unsigned int source,
198 unsigned int irqflags)
200 struct mpic_irq_fixup *fixup = &mpic->fixups[source];
204 if (fixup->base == NULL)
207 DBG("startup_ht_interrupt(%u, %u) index: %d\n",
208 source, irqflags, fixup->index);
209 spin_lock_irqsave(&mpic->fixup_lock, flags);
210 /* Enable and configure */
211 writeb(0x10 + 2 * fixup->index, fixup->base + 2);
212 tmp = readl(fixup->base + 4);
214 if (irqflags & IRQ_LEVEL)
216 writel(tmp, fixup->base + 4);
217 spin_unlock_irqrestore(&mpic->fixup_lock, flags);
220 static void mpic_shutdown_ht_interrupt(struct mpic *mpic, unsigned int source,
221 unsigned int irqflags)
223 struct mpic_irq_fixup *fixup = &mpic->fixups[source];
227 if (fixup->base == NULL)
230 DBG("shutdown_ht_interrupt(%u, %u)\n", source, irqflags);
233 spin_lock_irqsave(&mpic->fixup_lock, flags);
234 writeb(0x10 + 2 * fixup->index, fixup->base + 2);
235 tmp = readl(fixup->base + 4);
237 writel(tmp, fixup->base + 4);
238 spin_unlock_irqrestore(&mpic->fixup_lock, flags);
241 static void __init mpic_scan_ht_pic(struct mpic *mpic, u8 __iomem *devbase,
242 unsigned int devfn, u32 vdid)
249 for (pos = readb(devbase + PCI_CAPABILITY_LIST); pos != 0;
250 pos = readb(devbase + pos + PCI_CAP_LIST_NEXT)) {
251 u8 id = readb(devbase + pos + PCI_CAP_LIST_ID);
252 if (id == PCI_CAP_ID_HT_IRQCONF) {
253 id = readb(devbase + pos + 3);
261 base = devbase + pos;
262 writeb(0x01, base + 2);
263 n = (readl(base + 4) >> 16) & 0xff;
265 printk(KERN_INFO "mpic: - HT:%02x.%x [0x%02x] vendor %04x device %04x"
267 devfn >> 3, devfn & 0x7, pos, vdid & 0xffff, vdid >> 16, n + 1);
269 for (i = 0; i <= n; i++) {
270 writeb(0x10 + 2 * i, base + 2);
271 tmp = readl(base + 4);
272 irq = (tmp >> 16) & 0xff;
273 DBG("HT PIC index 0x%x, irq 0x%x, tmp: %08x\n", i, irq, tmp);
274 /* mask it , will be unmasked later */
276 writel(tmp, base + 4);
277 mpic->fixups[irq].index = i;
278 mpic->fixups[irq].base = base;
279 /* Apple HT PIC has a non-standard way of doing EOIs */
280 if ((vdid & 0xffff) == 0x106b)
281 mpic->fixups[irq].applebase = devbase + 0x60;
283 mpic->fixups[irq].applebase = NULL;
284 writeb(0x11 + 2 * i, base + 2);
285 mpic->fixups[irq].data = readl(base + 4) | 0x80000000;
290 static void __init mpic_scan_ht_pics(struct mpic *mpic)
293 u8 __iomem *cfgspace;
295 printk(KERN_INFO "mpic: Setting up HT PICs workarounds for U3/U4\n");
297 /* Allocate fixups array */
298 mpic->fixups = alloc_bootmem(128 * sizeof(struct mpic_irq_fixup));
299 BUG_ON(mpic->fixups == NULL);
300 memset(mpic->fixups, 0, 128 * sizeof(struct mpic_irq_fixup));
303 spin_lock_init(&mpic->fixup_lock);
305 /* Map U3 config space. We assume all IO-APICs are on the primary bus
306 * so we only need to map 64kB.
308 cfgspace = ioremap(0xf2000000, 0x10000);
309 BUG_ON(cfgspace == NULL);
311 /* Now we scan all slots. We do a very quick scan, we read the header
312 * type, vendor ID and device ID only, that's plenty enough
314 for (devfn = 0; devfn < 0x100; devfn++) {
315 u8 __iomem *devbase = cfgspace + (devfn << 8);
316 u8 hdr_type = readb(devbase + PCI_HEADER_TYPE);
317 u32 l = readl(devbase + PCI_VENDOR_ID);
320 DBG("devfn %x, l: %x\n", devfn, l);
322 /* If no device, skip */
323 if (l == 0xffffffff || l == 0x00000000 ||
324 l == 0x0000ffff || l == 0xffff0000)
326 /* Check if is supports capability lists */
327 s = readw(devbase + PCI_STATUS);
328 if (!(s & PCI_STATUS_CAP_LIST))
331 mpic_scan_ht_pic(mpic, devbase, devfn, l);
334 /* next device, if function 0 */
335 if (PCI_FUNC(devfn) == 0 && (hdr_type & 0x80) == 0)
340 #endif /* CONFIG_MPIC_BROKEN_U3 */
343 /* Find an mpic associated with a given linux interrupt */
344 static struct mpic *mpic_find(unsigned int irq, unsigned int *is_ipi)
346 struct mpic *mpic = mpics;
349 /* search IPIs first since they may override the main interrupts */
350 if (irq >= mpic->ipi_offset && irq < (mpic->ipi_offset + 4)) {
355 if (irq >= mpic->irq_offset &&
356 irq < (mpic->irq_offset + mpic->irq_count)) {
366 /* Convert a cpu mask from logical to physical cpu numbers. */
367 static inline u32 mpic_physmask(u32 cpumask)
372 for (i = 0; i < NR_CPUS; ++i, cpumask >>= 1)
373 mask |= (cpumask & 1) << get_hard_smp_processor_id(i);
378 /* Get the mpic structure from the IPI number */
379 static inline struct mpic * mpic_from_ipi(unsigned int ipi)
381 return container_of(irq_desc[ipi].chip, struct mpic, hc_ipi);
385 /* Get the mpic structure from the irq number */
386 static inline struct mpic * mpic_from_irq(unsigned int irq)
388 return container_of(irq_desc[irq].chip, struct mpic, hc_irq);
392 static inline void mpic_eoi(struct mpic *mpic)
394 mpic_cpu_write(MPIC_CPU_EOI, 0);
395 (void)mpic_cpu_read(MPIC_CPU_WHOAMI);
399 static irqreturn_t mpic_ipi_action(int irq, void *dev_id, struct pt_regs *regs)
401 struct mpic *mpic = dev_id;
403 smp_message_recv(irq - mpic->ipi_offset, regs);
406 #endif /* CONFIG_SMP */
409 * Linux descriptor level callbacks
413 static void mpic_enable_irq(unsigned int irq)
415 unsigned int loops = 100000;
416 struct mpic *mpic = mpic_from_irq(irq);
417 unsigned int src = irq - mpic->irq_offset;
419 DBG("%p: %s: enable_irq: %d (src %d)\n", mpic, mpic->name, irq, src);
421 mpic_irq_write(src, MPIC_IRQ_VECTOR_PRI,
422 mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI) &
425 /* make sure mask gets to controller before we return to user */
428 printk(KERN_ERR "mpic_enable_irq timeout\n");
431 } while(mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI) & MPIC_VECPRI_MASK);
433 #ifdef CONFIG_MPIC_BROKEN_U3
434 if (mpic->flags & MPIC_BROKEN_U3) {
435 unsigned int src = irq - mpic->irq_offset;
436 if (mpic_is_ht_interrupt(mpic, src) &&
437 (irq_desc[irq].status & IRQ_LEVEL))
438 mpic_ht_end_irq(mpic, src);
440 #endif /* CONFIG_MPIC_BROKEN_U3 */
443 static unsigned int mpic_startup_irq(unsigned int irq)
445 #ifdef CONFIG_MPIC_BROKEN_U3
446 struct mpic *mpic = mpic_from_irq(irq);
447 unsigned int src = irq - mpic->irq_offset;
448 #endif /* CONFIG_MPIC_BROKEN_U3 */
450 mpic_enable_irq(irq);
452 #ifdef CONFIG_MPIC_BROKEN_U3
453 if (mpic_is_ht_interrupt(mpic, src))
454 mpic_startup_ht_interrupt(mpic, src, irq_desc[irq].status);
455 #endif /* CONFIG_MPIC_BROKEN_U3 */
460 static void mpic_disable_irq(unsigned int irq)
462 unsigned int loops = 100000;
463 struct mpic *mpic = mpic_from_irq(irq);
464 unsigned int src = irq - mpic->irq_offset;
466 DBG("%s: disable_irq: %d (src %d)\n", mpic->name, irq, src);
468 mpic_irq_write(src, MPIC_IRQ_VECTOR_PRI,
469 mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI) |
472 /* make sure mask gets to controller before we return to user */
475 printk(KERN_ERR "mpic_enable_irq timeout\n");
478 } while(!(mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI) & MPIC_VECPRI_MASK));
481 static void mpic_shutdown_irq(unsigned int irq)
483 #ifdef CONFIG_MPIC_BROKEN_U3
484 struct mpic *mpic = mpic_from_irq(irq);
485 unsigned int src = irq - mpic->irq_offset;
487 if (mpic_is_ht_interrupt(mpic, src))
488 mpic_shutdown_ht_interrupt(mpic, src, irq_desc[irq].status);
490 #endif /* CONFIG_MPIC_BROKEN_U3 */
492 mpic_disable_irq(irq);
495 static void mpic_end_irq(unsigned int irq)
497 struct mpic *mpic = mpic_from_irq(irq);
500 DBG("%s: end_irq: %d\n", mpic->name, irq);
502 /* We always EOI on end_irq() even for edge interrupts since that
503 * should only lower the priority, the MPIC should have properly
504 * latched another edge interrupt coming in anyway
507 #ifdef CONFIG_MPIC_BROKEN_U3
508 if (mpic->flags & MPIC_BROKEN_U3) {
509 unsigned int src = irq - mpic->irq_offset;
510 if (mpic_is_ht_interrupt(mpic, src) &&
511 (irq_desc[irq].status & IRQ_LEVEL))
512 mpic_ht_end_irq(mpic, src);
514 #endif /* CONFIG_MPIC_BROKEN_U3 */
521 static void mpic_enable_ipi(unsigned int irq)
523 struct mpic *mpic = mpic_from_ipi(irq);
524 unsigned int src = irq - mpic->ipi_offset;
526 DBG("%s: enable_ipi: %d (ipi %d)\n", mpic->name, irq, src);
527 mpic_ipi_write(src, mpic_ipi_read(src) & ~MPIC_VECPRI_MASK);
530 static void mpic_disable_ipi(unsigned int irq)
532 /* NEVER disable an IPI... that's just plain wrong! */
535 static void mpic_end_ipi(unsigned int irq)
537 struct mpic *mpic = mpic_from_ipi(irq);
540 * IPIs are marked IRQ_PER_CPU. This has the side effect of
541 * preventing the IRQ_PENDING/IRQ_INPROGRESS logic from
542 * applying to them. We EOI them late to avoid re-entering.
543 * We mark IPI's with IRQF_DISABLED as they must run with
549 #endif /* CONFIG_SMP */
551 static void mpic_set_affinity(unsigned int irq, cpumask_t cpumask)
553 struct mpic *mpic = mpic_from_irq(irq);
557 cpus_and(tmp, cpumask, cpu_online_map);
559 mpic_irq_write(irq - mpic->irq_offset, MPIC_IRQ_DESTINATION,
560 mpic_physmask(cpus_addr(tmp)[0]));
569 struct mpic * __init mpic_alloc(unsigned long phys_addr,
571 unsigned int isu_size,
572 unsigned int irq_offset,
573 unsigned int irq_count,
574 unsigned int ipi_offset,
575 unsigned char *senses,
576 unsigned int senses_count,
584 mpic = alloc_bootmem(sizeof(struct mpic));
589 memset(mpic, 0, sizeof(struct mpic));
592 mpic->hc_irq.typename = name;
593 mpic->hc_irq.startup = mpic_startup_irq;
594 mpic->hc_irq.shutdown = mpic_shutdown_irq;
595 mpic->hc_irq.enable = mpic_enable_irq;
596 mpic->hc_irq.disable = mpic_disable_irq;
597 mpic->hc_irq.end = mpic_end_irq;
598 if (flags & MPIC_PRIMARY)
599 mpic->hc_irq.set_affinity = mpic_set_affinity;
601 mpic->hc_ipi.typename = name;
602 mpic->hc_ipi.enable = mpic_enable_ipi;
603 mpic->hc_ipi.disable = mpic_disable_ipi;
604 mpic->hc_ipi.end = mpic_end_ipi;
605 #endif /* CONFIG_SMP */
608 mpic->isu_size = isu_size;
609 mpic->irq_offset = irq_offset;
610 mpic->irq_count = irq_count;
611 mpic->ipi_offset = ipi_offset;
612 mpic->num_sources = 0; /* so far */
613 mpic->senses = senses;
614 mpic->senses_count = senses_count;
616 /* Map the global registers */
617 mpic->gregs = ioremap(phys_addr + MPIC_GREG_BASE, 0x1000);
618 mpic->tmregs = mpic->gregs + ((MPIC_TIMER_BASE - MPIC_GREG_BASE) >> 2);
619 BUG_ON(mpic->gregs == NULL);
622 if (flags & MPIC_WANTS_RESET) {
623 mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_0,
624 mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_0)
625 | MPIC_GREG_GCONF_RESET);
626 while( mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_0)
627 & MPIC_GREG_GCONF_RESET)
631 /* Read feature register, calculate num CPUs and, for non-ISU
632 * MPICs, num sources as well. On ISU MPICs, sources are counted
635 reg = mpic_read(mpic->gregs, MPIC_GREG_FEATURE_0);
636 mpic->num_cpus = ((reg & MPIC_GREG_FEATURE_LAST_CPU_MASK)
637 >> MPIC_GREG_FEATURE_LAST_CPU_SHIFT) + 1;
639 mpic->num_sources = ((reg & MPIC_GREG_FEATURE_LAST_SRC_MASK)
640 >> MPIC_GREG_FEATURE_LAST_SRC_SHIFT) + 1;
642 /* Map the per-CPU registers */
643 for (i = 0; i < mpic->num_cpus; i++) {
644 mpic->cpuregs[i] = ioremap(phys_addr + MPIC_CPU_BASE +
645 i * MPIC_CPU_STRIDE, 0x1000);
646 BUG_ON(mpic->cpuregs[i] == NULL);
649 /* Initialize main ISU if none provided */
650 if (mpic->isu_size == 0) {
651 mpic->isu_size = mpic->num_sources;
652 mpic->isus[0] = ioremap(phys_addr + MPIC_IRQ_BASE,
653 MPIC_IRQ_STRIDE * mpic->isu_size);
654 BUG_ON(mpic->isus[0] == NULL);
656 mpic->isu_shift = 1 + __ilog2(mpic->isu_size - 1);
657 mpic->isu_mask = (1 << mpic->isu_shift) - 1;
659 /* Display version */
660 switch (reg & MPIC_GREG_FEATURE_VERSION_MASK) {
674 printk(KERN_INFO "mpic: Setting up MPIC \"%s\" version %s at %lx, max %d CPUs\n",
675 name, vers, phys_addr, mpic->num_cpus);
676 printk(KERN_INFO "mpic: ISU size: %d, shift: %d, mask: %x\n", mpic->isu_size,
677 mpic->isu_shift, mpic->isu_mask);
682 if (flags & MPIC_PRIMARY)
688 void __init mpic_assign_isu(struct mpic *mpic, unsigned int isu_num,
689 unsigned long phys_addr)
691 unsigned int isu_first = isu_num * mpic->isu_size;
693 BUG_ON(isu_num >= MPIC_MAX_ISU);
695 mpic->isus[isu_num] = ioremap(phys_addr, MPIC_IRQ_STRIDE * mpic->isu_size);
696 if ((isu_first + mpic->isu_size) > mpic->num_sources)
697 mpic->num_sources = isu_first + mpic->isu_size;
700 void __init mpic_setup_cascade(unsigned int irq, mpic_cascade_t handler,
703 struct mpic *mpic = mpic_find(irq, NULL);
706 /* Synchronization here is a bit dodgy, so don't try to replace cascade
707 * interrupts on the fly too often ... but normally it's set up at boot.
709 spin_lock_irqsave(&mpic_lock, flags);
711 mpic_disable_irq(mpic->cascade_vec + mpic->irq_offset);
712 mpic->cascade = NULL;
714 mpic->cascade_vec = irq - mpic->irq_offset;
715 mpic->cascade_data = data;
717 mpic->cascade = handler;
718 mpic_enable_irq(irq);
719 spin_unlock_irqrestore(&mpic_lock, flags);
722 void __init mpic_init(struct mpic *mpic)
726 BUG_ON(mpic->num_sources == 0);
728 printk(KERN_INFO "mpic: Initializing for %d sources\n", mpic->num_sources);
730 /* Set current processor priority to max */
731 mpic_cpu_write(MPIC_CPU_CURRENT_TASK_PRI, 0xf);
733 /* Initialize timers: just disable them all */
734 for (i = 0; i < 4; i++) {
735 mpic_write(mpic->tmregs,
736 i * MPIC_TIMER_STRIDE + MPIC_TIMER_DESTINATION, 0);
737 mpic_write(mpic->tmregs,
738 i * MPIC_TIMER_STRIDE + MPIC_TIMER_VECTOR_PRI,
740 (MPIC_VEC_TIMER_0 + i));
743 /* Initialize IPIs to our reserved vectors and mark them disabled for now */
744 mpic_test_broken_ipi(mpic);
745 for (i = 0; i < 4; i++) {
748 (10 << MPIC_VECPRI_PRIORITY_SHIFT) |
749 (MPIC_VEC_IPI_0 + i));
751 if (!(mpic->flags & MPIC_PRIMARY))
753 irq_desc[mpic->ipi_offset+i].status |= IRQ_PER_CPU;
754 irq_desc[mpic->ipi_offset+i].chip = &mpic->hc_ipi;
755 #endif /* CONFIG_SMP */
758 /* Initialize interrupt sources */
759 if (mpic->irq_count == 0)
760 mpic->irq_count = mpic->num_sources;
762 #ifdef CONFIG_MPIC_BROKEN_U3
763 /* Do the HT PIC fixups on U3 broken mpic */
764 DBG("MPIC flags: %x\n", mpic->flags);
765 if ((mpic->flags & MPIC_BROKEN_U3) && (mpic->flags & MPIC_PRIMARY))
766 mpic_scan_ht_pics(mpic);
767 #endif /* CONFIG_MPIC_BROKEN_U3 */
769 for (i = 0; i < mpic->num_sources; i++) {
770 /* start with vector = source number, and masked */
771 u32 vecpri = MPIC_VECPRI_MASK | i | (8 << MPIC_VECPRI_PRIORITY_SHIFT);
774 /* if it's an IPI, we skip it */
775 if ((mpic->irq_offset + i) >= (mpic->ipi_offset + i) &&
776 (mpic->irq_offset + i) < (mpic->ipi_offset + i + 4))
779 /* do senses munging */
780 if (mpic->senses && i < mpic->senses_count) {
781 if (mpic->senses[i] & IRQ_SENSE_LEVEL)
782 vecpri |= MPIC_VECPRI_SENSE_LEVEL;
783 if (mpic->senses[i] & IRQ_POLARITY_POSITIVE)
784 vecpri |= MPIC_VECPRI_POLARITY_POSITIVE;
786 vecpri |= MPIC_VECPRI_SENSE_LEVEL;
788 /* remember if it was a level interrupts */
789 level = (vecpri & MPIC_VECPRI_SENSE_LEVEL);
791 /* deal with broken U3 */
792 if (mpic->flags & MPIC_BROKEN_U3) {
793 #ifdef CONFIG_MPIC_BROKEN_U3
794 if (mpic_is_ht_interrupt(mpic, i)) {
795 vecpri &= ~(MPIC_VECPRI_SENSE_MASK |
796 MPIC_VECPRI_POLARITY_MASK);
797 vecpri |= MPIC_VECPRI_POLARITY_POSITIVE;
800 printk(KERN_ERR "mpic: BROKEN_U3 set, but CONFIG doesn't match\n");
804 DBG("setup source %d, vecpri: %08x, level: %d\n", i, vecpri,
808 mpic_irq_write(i, MPIC_IRQ_VECTOR_PRI, vecpri);
809 mpic_irq_write(i, MPIC_IRQ_DESTINATION,
810 1 << hard_smp_processor_id());
812 /* init linux descriptors */
813 if (i < mpic->irq_count) {
814 irq_desc[mpic->irq_offset+i].status = level ? IRQ_LEVEL : 0;
815 irq_desc[mpic->irq_offset+i].chip = &mpic->hc_irq;
819 /* Init spurrious vector */
820 mpic_write(mpic->gregs, MPIC_GREG_SPURIOUS, MPIC_VEC_SPURRIOUS);
822 /* Disable 8259 passthrough */
823 mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_0,
824 mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_0)
825 | MPIC_GREG_GCONF_8259_PTHROU_DIS);
827 /* Set current processor priority to 0 */
828 mpic_cpu_write(MPIC_CPU_CURRENT_TASK_PRI, 0);
831 void __init mpic_set_clk_ratio(struct mpic *mpic, u32 clock_ratio)
835 v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1);
836 v &= ~MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO_MASK;
837 v |= MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO(clock_ratio);
838 mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v);
841 void __init mpic_set_serial_int(struct mpic *mpic, int enable)
845 v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1);
847 v |= MPIC_GREG_GLOBAL_CONF_1_SIE;
849 v &= ~MPIC_GREG_GLOBAL_CONF_1_SIE;
850 mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v);
853 void mpic_irq_set_priority(unsigned int irq, unsigned int pri)
856 struct mpic *mpic = mpic_find(irq, &is_ipi);
860 spin_lock_irqsave(&mpic_lock, flags);
862 reg = mpic_ipi_read(irq - mpic->ipi_offset) &
863 ~MPIC_VECPRI_PRIORITY_MASK;
864 mpic_ipi_write(irq - mpic->ipi_offset,
865 reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
867 reg = mpic_irq_read(irq - mpic->irq_offset,MPIC_IRQ_VECTOR_PRI)
868 & ~MPIC_VECPRI_PRIORITY_MASK;
869 mpic_irq_write(irq - mpic->irq_offset, MPIC_IRQ_VECTOR_PRI,
870 reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
872 spin_unlock_irqrestore(&mpic_lock, flags);
875 unsigned int mpic_irq_get_priority(unsigned int irq)
878 struct mpic *mpic = mpic_find(irq, &is_ipi);
882 spin_lock_irqsave(&mpic_lock, flags);
884 reg = mpic_ipi_read(irq - mpic->ipi_offset);
886 reg = mpic_irq_read(irq - mpic->irq_offset, MPIC_IRQ_VECTOR_PRI);
887 spin_unlock_irqrestore(&mpic_lock, flags);
888 return (reg & MPIC_VECPRI_PRIORITY_MASK) >> MPIC_VECPRI_PRIORITY_SHIFT;
891 void mpic_setup_this_cpu(void)
894 struct mpic *mpic = mpic_primary;
896 u32 msk = 1 << hard_smp_processor_id();
899 BUG_ON(mpic == NULL);
901 DBG("%s: setup_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
903 spin_lock_irqsave(&mpic_lock, flags);
905 /* let the mpic know we want intrs. default affinity is 0xffffffff
906 * until changed via /proc. That's how it's done on x86. If we want
907 * it differently, then we should make sure we also change the default
908 * values of irq_desc[].affinity in irq.c.
910 if (distribute_irqs) {
911 for (i = 0; i < mpic->num_sources ; i++)
912 mpic_irq_write(i, MPIC_IRQ_DESTINATION,
913 mpic_irq_read(i, MPIC_IRQ_DESTINATION) | msk);
916 /* Set current processor priority to 0 */
917 mpic_cpu_write(MPIC_CPU_CURRENT_TASK_PRI, 0);
919 spin_unlock_irqrestore(&mpic_lock, flags);
920 #endif /* CONFIG_SMP */
923 int mpic_cpu_get_priority(void)
925 struct mpic *mpic = mpic_primary;
927 return mpic_cpu_read(MPIC_CPU_CURRENT_TASK_PRI);
930 void mpic_cpu_set_priority(int prio)
932 struct mpic *mpic = mpic_primary;
934 prio &= MPIC_CPU_TASKPRI_MASK;
935 mpic_cpu_write(MPIC_CPU_CURRENT_TASK_PRI, prio);
939 * XXX: someone who knows mpic should check this.
940 * do we need to eoi the ipi including for kexec cpu here (see xics comments)?
941 * or can we reset the mpic in the new kernel?
943 void mpic_teardown_this_cpu(int secondary)
945 struct mpic *mpic = mpic_primary;
947 u32 msk = 1 << hard_smp_processor_id();
950 BUG_ON(mpic == NULL);
952 DBG("%s: teardown_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
953 spin_lock_irqsave(&mpic_lock, flags);
955 /* let the mpic know we don't want intrs. */
956 for (i = 0; i < mpic->num_sources ; i++)
957 mpic_irq_write(i, MPIC_IRQ_DESTINATION,
958 mpic_irq_read(i, MPIC_IRQ_DESTINATION) & ~msk);
960 /* Set current processor priority to max */
961 mpic_cpu_write(MPIC_CPU_CURRENT_TASK_PRI, 0xf);
963 spin_unlock_irqrestore(&mpic_lock, flags);
967 void mpic_send_ipi(unsigned int ipi_no, unsigned int cpu_mask)
969 struct mpic *mpic = mpic_primary;
971 BUG_ON(mpic == NULL);
974 DBG("%s: send_ipi(ipi_no: %d)\n", mpic->name, ipi_no);
977 mpic_cpu_write(MPIC_CPU_IPI_DISPATCH_0 + ipi_no * 0x10,
978 mpic_physmask(cpu_mask & cpus_addr(cpu_online_map)[0]));
981 int mpic_get_one_irq(struct mpic *mpic, struct pt_regs *regs)
985 irq = mpic_cpu_read(MPIC_CPU_INTACK) & MPIC_VECPRI_VECTOR_MASK;
987 DBG("%s: get_one_irq(): %d\n", mpic->name, irq);
989 if (mpic->cascade && irq == mpic->cascade_vec) {
991 DBG("%s: cascading ...\n", mpic->name);
993 irq = mpic->cascade(regs, mpic->cascade_data);
997 if (unlikely(irq == MPIC_VEC_SPURRIOUS))
999 if (irq < MPIC_VEC_IPI_0) {
1001 DBG("%s: irq %d\n", mpic->name, irq + mpic->irq_offset);
1003 return irq + mpic->irq_offset;
1006 DBG("%s: ipi %d !\n", mpic->name, irq - MPIC_VEC_IPI_0);
1008 return irq - MPIC_VEC_IPI_0 + mpic->ipi_offset;
1011 int mpic_get_irq(struct pt_regs *regs)
1013 struct mpic *mpic = mpic_primary;
1015 BUG_ON(mpic == NULL);
1017 return mpic_get_one_irq(mpic, regs);
1022 void mpic_request_ipis(void)
1024 struct mpic *mpic = mpic_primary;
1026 BUG_ON(mpic == NULL);
1028 printk("requesting IPIs ... \n");
1031 * IPIs are marked IRQF_DISABLED as they must run with irqs
1034 request_irq(mpic->ipi_offset+0, mpic_ipi_action, IRQF_DISABLED,
1035 "IPI0 (call function)", mpic);
1036 request_irq(mpic->ipi_offset+1, mpic_ipi_action, IRQF_DISABLED,
1037 "IPI1 (reschedule)", mpic);
1038 request_irq(mpic->ipi_offset+2, mpic_ipi_action, IRQF_DISABLED,
1039 "IPI2 (unused)", mpic);
1040 request_irq(mpic->ipi_offset+3, mpic_ipi_action, IRQF_DISABLED,
1041 "IPI3 (debugger break)", mpic);
1043 printk("IPIs requested... \n");
1046 void smp_mpic_message_pass(int target, int msg)
1048 /* make sure we're sending something that translates to an IPI */
1049 if ((unsigned int)msg > 3) {
1050 printk("SMP %d: smp_message_pass: unknown msg %d\n",
1051 smp_processor_id(), msg);
1056 mpic_send_ipi(msg, 0xffffffff);
1058 case MSG_ALL_BUT_SELF:
1059 mpic_send_ipi(msg, 0xffffffff & ~(1 << smp_processor_id()));
1062 mpic_send_ipi(msg, 1 << target);
1066 #endif /* CONFIG_SMP */