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>
29 #include <linux/slab.h>
30 #include <linux/syscore_ops.h>
32 #include <asm/ptrace.h>
33 #include <asm/signal.h>
35 #include <asm/pgtable.h>
37 #include <asm/machdep.h>
44 #define DBG(fmt...) printk(fmt)
49 static struct mpic *mpics;
50 static struct mpic *mpic_primary;
51 static DEFINE_RAW_SPINLOCK(mpic_lock);
53 #ifdef CONFIG_PPC32 /* XXX for now */
54 #ifdef CONFIG_IRQ_ALL_CPUS
55 #define distribute_irqs (1)
57 #define distribute_irqs (0)
61 #ifdef CONFIG_MPIC_WEIRD
62 static u32 mpic_infos[][MPIC_IDX_END] = {
63 [0] = { /* Original OpenPIC compatible MPIC */
66 MPIC_GREG_GLOBAL_CONF_0,
68 MPIC_GREG_IPI_VECTOR_PRI_0,
75 MPIC_TIMER_CURRENT_CNT,
77 MPIC_TIMER_VECTOR_PRI,
78 MPIC_TIMER_DESTINATION,
82 MPIC_CPU_IPI_DISPATCH_0,
83 MPIC_CPU_IPI_DISPATCH_STRIDE,
84 MPIC_CPU_CURRENT_TASK_PRI,
93 MPIC_VECPRI_VECTOR_MASK,
94 MPIC_VECPRI_POLARITY_POSITIVE,
95 MPIC_VECPRI_POLARITY_NEGATIVE,
96 MPIC_VECPRI_SENSE_LEVEL,
97 MPIC_VECPRI_SENSE_EDGE,
98 MPIC_VECPRI_POLARITY_MASK,
99 MPIC_VECPRI_SENSE_MASK,
102 [1] = { /* Tsi108/109 PIC */
104 TSI108_GREG_FEATURE_0,
105 TSI108_GREG_GLOBAL_CONF_0,
106 TSI108_GREG_VENDOR_ID,
107 TSI108_GREG_IPI_VECTOR_PRI_0,
108 TSI108_GREG_IPI_STRIDE,
109 TSI108_GREG_SPURIOUS,
110 TSI108_GREG_TIMER_FREQ,
114 TSI108_TIMER_CURRENT_CNT,
115 TSI108_TIMER_BASE_CNT,
116 TSI108_TIMER_VECTOR_PRI,
117 TSI108_TIMER_DESTINATION,
121 TSI108_CPU_IPI_DISPATCH_0,
122 TSI108_CPU_IPI_DISPATCH_STRIDE,
123 TSI108_CPU_CURRENT_TASK_PRI,
131 TSI108_IRQ_VECTOR_PRI,
132 TSI108_VECPRI_VECTOR_MASK,
133 TSI108_VECPRI_POLARITY_POSITIVE,
134 TSI108_VECPRI_POLARITY_NEGATIVE,
135 TSI108_VECPRI_SENSE_LEVEL,
136 TSI108_VECPRI_SENSE_EDGE,
137 TSI108_VECPRI_POLARITY_MASK,
138 TSI108_VECPRI_SENSE_MASK,
139 TSI108_IRQ_DESTINATION
143 #define MPIC_INFO(name) mpic->hw_set[MPIC_IDX_##name]
145 #else /* CONFIG_MPIC_WEIRD */
147 #define MPIC_INFO(name) MPIC_##name
149 #endif /* CONFIG_MPIC_WEIRD */
151 static inline unsigned int mpic_processor_id(struct mpic *mpic)
153 unsigned int cpu = 0;
155 if (mpic->flags & MPIC_PRIMARY)
156 cpu = hard_smp_processor_id();
162 * Register accessor functions
166 static inline u32 _mpic_read(enum mpic_reg_type type,
167 struct mpic_reg_bank *rb,
171 #ifdef CONFIG_PPC_DCR
172 case mpic_access_dcr:
173 return dcr_read(rb->dhost, reg);
175 case mpic_access_mmio_be:
176 return in_be32(rb->base + (reg >> 2));
177 case mpic_access_mmio_le:
179 return in_le32(rb->base + (reg >> 2));
183 static inline void _mpic_write(enum mpic_reg_type type,
184 struct mpic_reg_bank *rb,
185 unsigned int reg, u32 value)
188 #ifdef CONFIG_PPC_DCR
189 case mpic_access_dcr:
190 dcr_write(rb->dhost, reg, value);
193 case mpic_access_mmio_be:
194 out_be32(rb->base + (reg >> 2), value);
196 case mpic_access_mmio_le:
198 out_le32(rb->base + (reg >> 2), value);
203 static inline u32 _mpic_ipi_read(struct mpic *mpic, unsigned int ipi)
205 enum mpic_reg_type type = mpic->reg_type;
206 unsigned int offset = MPIC_INFO(GREG_IPI_VECTOR_PRI_0) +
207 (ipi * MPIC_INFO(GREG_IPI_STRIDE));
209 if ((mpic->flags & MPIC_BROKEN_IPI) && type == mpic_access_mmio_le)
210 type = mpic_access_mmio_be;
211 return _mpic_read(type, &mpic->gregs, offset);
214 static inline void _mpic_ipi_write(struct mpic *mpic, unsigned int ipi, u32 value)
216 unsigned int offset = MPIC_INFO(GREG_IPI_VECTOR_PRI_0) +
217 (ipi * MPIC_INFO(GREG_IPI_STRIDE));
219 _mpic_write(mpic->reg_type, &mpic->gregs, offset, value);
222 static inline u32 _mpic_cpu_read(struct mpic *mpic, unsigned int reg)
224 unsigned int cpu = mpic_processor_id(mpic);
226 return _mpic_read(mpic->reg_type, &mpic->cpuregs[cpu], reg);
229 static inline void _mpic_cpu_write(struct mpic *mpic, unsigned int reg, u32 value)
231 unsigned int cpu = mpic_processor_id(mpic);
233 _mpic_write(mpic->reg_type, &mpic->cpuregs[cpu], reg, value);
236 static inline u32 _mpic_irq_read(struct mpic *mpic, unsigned int src_no, unsigned int reg)
238 unsigned int isu = src_no >> mpic->isu_shift;
239 unsigned int idx = src_no & mpic->isu_mask;
242 val = _mpic_read(mpic->reg_type, &mpic->isus[isu],
243 reg + (idx * MPIC_INFO(IRQ_STRIDE)));
244 #ifdef CONFIG_MPIC_BROKEN_REGREAD
246 val = (val & (MPIC_VECPRI_MASK | MPIC_VECPRI_ACTIVITY)) |
247 mpic->isu_reg0_shadow[src_no];
252 static inline void _mpic_irq_write(struct mpic *mpic, unsigned int src_no,
253 unsigned int reg, u32 value)
255 unsigned int isu = src_no >> mpic->isu_shift;
256 unsigned int idx = src_no & mpic->isu_mask;
258 _mpic_write(mpic->reg_type, &mpic->isus[isu],
259 reg + (idx * MPIC_INFO(IRQ_STRIDE)), value);
261 #ifdef CONFIG_MPIC_BROKEN_REGREAD
263 mpic->isu_reg0_shadow[src_no] =
264 value & ~(MPIC_VECPRI_MASK | MPIC_VECPRI_ACTIVITY);
268 #define mpic_read(b,r) _mpic_read(mpic->reg_type,&(b),(r))
269 #define mpic_write(b,r,v) _mpic_write(mpic->reg_type,&(b),(r),(v))
270 #define mpic_ipi_read(i) _mpic_ipi_read(mpic,(i))
271 #define mpic_ipi_write(i,v) _mpic_ipi_write(mpic,(i),(v))
272 #define mpic_cpu_read(i) _mpic_cpu_read(mpic,(i))
273 #define mpic_cpu_write(i,v) _mpic_cpu_write(mpic,(i),(v))
274 #define mpic_irq_read(s,r) _mpic_irq_read(mpic,(s),(r))
275 #define mpic_irq_write(s,r,v) _mpic_irq_write(mpic,(s),(r),(v))
279 * Low level utility functions
283 static void _mpic_map_mmio(struct mpic *mpic, phys_addr_t phys_addr,
284 struct mpic_reg_bank *rb, unsigned int offset,
287 rb->base = ioremap(phys_addr + offset, size);
288 BUG_ON(rb->base == NULL);
291 #ifdef CONFIG_PPC_DCR
292 static void _mpic_map_dcr(struct mpic *mpic, struct device_node *node,
293 struct mpic_reg_bank *rb,
294 unsigned int offset, unsigned int size)
298 dbasep = of_get_property(node, "dcr-reg", NULL);
300 rb->dhost = dcr_map(node, *dbasep + offset, size);
301 BUG_ON(!DCR_MAP_OK(rb->dhost));
304 static inline void mpic_map(struct mpic *mpic, struct device_node *node,
305 phys_addr_t phys_addr, struct mpic_reg_bank *rb,
306 unsigned int offset, unsigned int size)
308 if (mpic->flags & MPIC_USES_DCR)
309 _mpic_map_dcr(mpic, node, rb, offset, size);
311 _mpic_map_mmio(mpic, phys_addr, rb, offset, size);
313 #else /* CONFIG_PPC_DCR */
314 #define mpic_map(m,n,p,b,o,s) _mpic_map_mmio(m,p,b,o,s)
315 #endif /* !CONFIG_PPC_DCR */
319 /* Check if we have one of those nice broken MPICs with a flipped endian on
320 * reads from IPI registers
322 static void __init mpic_test_broken_ipi(struct mpic *mpic)
326 mpic_write(mpic->gregs, MPIC_INFO(GREG_IPI_VECTOR_PRI_0), MPIC_VECPRI_MASK);
327 r = mpic_read(mpic->gregs, MPIC_INFO(GREG_IPI_VECTOR_PRI_0));
329 if (r == le32_to_cpu(MPIC_VECPRI_MASK)) {
330 printk(KERN_INFO "mpic: Detected reversed IPI registers\n");
331 mpic->flags |= MPIC_BROKEN_IPI;
335 #ifdef CONFIG_MPIC_U3_HT_IRQS
337 /* Test if an interrupt is sourced from HyperTransport (used on broken U3s)
338 * to force the edge setting on the MPIC and do the ack workaround.
340 static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source)
342 if (source >= 128 || !mpic->fixups)
344 return mpic->fixups[source].base != NULL;
348 static inline void mpic_ht_end_irq(struct mpic *mpic, unsigned int source)
350 struct mpic_irq_fixup *fixup = &mpic->fixups[source];
352 if (fixup->applebase) {
353 unsigned int soff = (fixup->index >> 3) & ~3;
354 unsigned int mask = 1U << (fixup->index & 0x1f);
355 writel(mask, fixup->applebase + soff);
357 raw_spin_lock(&mpic->fixup_lock);
358 writeb(0x11 + 2 * fixup->index, fixup->base + 2);
359 writel(fixup->data, fixup->base + 4);
360 raw_spin_unlock(&mpic->fixup_lock);
364 static void mpic_startup_ht_interrupt(struct mpic *mpic, unsigned int source,
367 struct mpic_irq_fixup *fixup = &mpic->fixups[source];
371 if (fixup->base == NULL)
374 DBG("startup_ht_interrupt(0x%x) index: %d\n",
375 source, fixup->index);
376 raw_spin_lock_irqsave(&mpic->fixup_lock, flags);
377 /* Enable and configure */
378 writeb(0x10 + 2 * fixup->index, fixup->base + 2);
379 tmp = readl(fixup->base + 4);
383 writel(tmp, fixup->base + 4);
384 raw_spin_unlock_irqrestore(&mpic->fixup_lock, flags);
387 /* use the lowest bit inverted to the actual HW,
388 * set if this fixup was enabled, clear otherwise */
389 mpic->save_data[source].fixup_data = tmp | 1;
393 static void mpic_shutdown_ht_interrupt(struct mpic *mpic, unsigned int source)
395 struct mpic_irq_fixup *fixup = &mpic->fixups[source];
399 if (fixup->base == NULL)
402 DBG("shutdown_ht_interrupt(0x%x)\n", source);
405 raw_spin_lock_irqsave(&mpic->fixup_lock, flags);
406 writeb(0x10 + 2 * fixup->index, fixup->base + 2);
407 tmp = readl(fixup->base + 4);
409 writel(tmp, fixup->base + 4);
410 raw_spin_unlock_irqrestore(&mpic->fixup_lock, flags);
413 /* use the lowest bit inverted to the actual HW,
414 * set if this fixup was enabled, clear otherwise */
415 mpic->save_data[source].fixup_data = tmp & ~1;
419 #ifdef CONFIG_PCI_MSI
420 static void __init mpic_scan_ht_msi(struct mpic *mpic, u8 __iomem *devbase,
427 for (pos = readb(devbase + PCI_CAPABILITY_LIST); pos != 0;
428 pos = readb(devbase + pos + PCI_CAP_LIST_NEXT)) {
429 u8 id = readb(devbase + pos + PCI_CAP_LIST_ID);
430 if (id == PCI_CAP_ID_HT) {
431 id = readb(devbase + pos + 3);
432 if ((id & HT_5BIT_CAP_MASK) == HT_CAPTYPE_MSI_MAPPING)
440 base = devbase + pos;
442 flags = readb(base + HT_MSI_FLAGS);
443 if (!(flags & HT_MSI_FLAGS_FIXED)) {
444 addr = readl(base + HT_MSI_ADDR_LO) & HT_MSI_ADDR_LO_MASK;
445 addr = addr | ((u64)readl(base + HT_MSI_ADDR_HI) << 32);
448 printk(KERN_DEBUG "mpic: - HT:%02x.%x %s MSI mapping found @ 0x%llx\n",
449 PCI_SLOT(devfn), PCI_FUNC(devfn),
450 flags & HT_MSI_FLAGS_ENABLE ? "enabled" : "disabled", addr);
452 if (!(flags & HT_MSI_FLAGS_ENABLE))
453 writeb(flags | HT_MSI_FLAGS_ENABLE, base + HT_MSI_FLAGS);
456 static void __init mpic_scan_ht_msi(struct mpic *mpic, u8 __iomem *devbase,
463 static void __init mpic_scan_ht_pic(struct mpic *mpic, u8 __iomem *devbase,
464 unsigned int devfn, u32 vdid)
471 for (pos = readb(devbase + PCI_CAPABILITY_LIST); pos != 0;
472 pos = readb(devbase + pos + PCI_CAP_LIST_NEXT)) {
473 u8 id = readb(devbase + pos + PCI_CAP_LIST_ID);
474 if (id == PCI_CAP_ID_HT) {
475 id = readb(devbase + pos + 3);
476 if ((id & HT_5BIT_CAP_MASK) == HT_CAPTYPE_IRQ)
483 base = devbase + pos;
484 writeb(0x01, base + 2);
485 n = (readl(base + 4) >> 16) & 0xff;
487 printk(KERN_INFO "mpic: - HT:%02x.%x [0x%02x] vendor %04x device %04x"
489 devfn >> 3, devfn & 0x7, pos, vdid & 0xffff, vdid >> 16, n + 1);
491 for (i = 0; i <= n; i++) {
492 writeb(0x10 + 2 * i, base + 2);
493 tmp = readl(base + 4);
494 irq = (tmp >> 16) & 0xff;
495 DBG("HT PIC index 0x%x, irq 0x%x, tmp: %08x\n", i, irq, tmp);
496 /* mask it , will be unmasked later */
498 writel(tmp, base + 4);
499 mpic->fixups[irq].index = i;
500 mpic->fixups[irq].base = base;
501 /* Apple HT PIC has a non-standard way of doing EOIs */
502 if ((vdid & 0xffff) == 0x106b)
503 mpic->fixups[irq].applebase = devbase + 0x60;
505 mpic->fixups[irq].applebase = NULL;
506 writeb(0x11 + 2 * i, base + 2);
507 mpic->fixups[irq].data = readl(base + 4) | 0x80000000;
512 static void __init mpic_scan_ht_pics(struct mpic *mpic)
515 u8 __iomem *cfgspace;
517 printk(KERN_INFO "mpic: Setting up HT PICs workarounds for U3/U4\n");
519 /* Allocate fixups array */
520 mpic->fixups = kzalloc(128 * sizeof(*mpic->fixups), GFP_KERNEL);
521 BUG_ON(mpic->fixups == NULL);
524 raw_spin_lock_init(&mpic->fixup_lock);
526 /* Map U3 config space. We assume all IO-APICs are on the primary bus
527 * so we only need to map 64kB.
529 cfgspace = ioremap(0xf2000000, 0x10000);
530 BUG_ON(cfgspace == NULL);
532 /* Now we scan all slots. We do a very quick scan, we read the header
533 * type, vendor ID and device ID only, that's plenty enough
535 for (devfn = 0; devfn < 0x100; devfn++) {
536 u8 __iomem *devbase = cfgspace + (devfn << 8);
537 u8 hdr_type = readb(devbase + PCI_HEADER_TYPE);
538 u32 l = readl(devbase + PCI_VENDOR_ID);
541 DBG("devfn %x, l: %x\n", devfn, l);
543 /* If no device, skip */
544 if (l == 0xffffffff || l == 0x00000000 ||
545 l == 0x0000ffff || l == 0xffff0000)
547 /* Check if is supports capability lists */
548 s = readw(devbase + PCI_STATUS);
549 if (!(s & PCI_STATUS_CAP_LIST))
552 mpic_scan_ht_pic(mpic, devbase, devfn, l);
553 mpic_scan_ht_msi(mpic, devbase, devfn);
556 /* next device, if function 0 */
557 if (PCI_FUNC(devfn) == 0 && (hdr_type & 0x80) == 0)
562 #else /* CONFIG_MPIC_U3_HT_IRQS */
564 static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source)
569 static void __init mpic_scan_ht_pics(struct mpic *mpic)
573 #endif /* CONFIG_MPIC_U3_HT_IRQS */
576 static int irq_choose_cpu(const struct cpumask *mask)
580 if (cpumask_equal(mask, cpu_all_mask)) {
581 static int irq_rover = 0;
582 static DEFINE_RAW_SPINLOCK(irq_rover_lock);
585 /* Round-robin distribution... */
587 raw_spin_lock_irqsave(&irq_rover_lock, flags);
589 irq_rover = cpumask_next(irq_rover, cpu_online_mask);
590 if (irq_rover >= nr_cpu_ids)
591 irq_rover = cpumask_first(cpu_online_mask);
595 raw_spin_unlock_irqrestore(&irq_rover_lock, flags);
597 cpuid = cpumask_first_and(mask, cpu_online_mask);
598 if (cpuid >= nr_cpu_ids)
602 return get_hard_smp_processor_id(cpuid);
605 static int irq_choose_cpu(const struct cpumask *mask)
607 return hard_smp_processor_id();
611 #define mpic_irq_to_hw(virq) ((unsigned int)irq_map[virq].hwirq)
613 /* Find an mpic associated with a given linux interrupt */
614 static struct mpic *mpic_find(unsigned int irq)
616 if (irq < NUM_ISA_INTERRUPTS)
619 return irq_get_chip_data(irq);
622 /* Determine if the linux irq is an IPI */
623 static unsigned int mpic_is_ipi(struct mpic *mpic, unsigned int irq)
625 unsigned int src = mpic_irq_to_hw(irq);
627 return (src >= mpic->ipi_vecs[0] && src <= mpic->ipi_vecs[3]);
631 /* Convert a cpu mask from logical to physical cpu numbers. */
632 static inline u32 mpic_physmask(u32 cpumask)
637 for (i = 0; i < NR_CPUS; ++i, cpumask >>= 1)
638 mask |= (cpumask & 1) << get_hard_smp_processor_id(i);
643 /* Get the mpic structure from the IPI number */
644 static inline struct mpic * mpic_from_ipi(struct irq_data *d)
646 return irq_data_get_irq_chip_data(d);
650 /* Get the mpic structure from the irq number */
651 static inline struct mpic * mpic_from_irq(unsigned int irq)
653 return irq_get_chip_data(irq);
656 /* Get the mpic structure from the irq data */
657 static inline struct mpic * mpic_from_irq_data(struct irq_data *d)
659 return irq_data_get_irq_chip_data(d);
663 static inline void mpic_eoi(struct mpic *mpic)
665 mpic_cpu_write(MPIC_INFO(CPU_EOI), 0);
666 (void)mpic_cpu_read(MPIC_INFO(CPU_WHOAMI));
670 * Linux descriptor level callbacks
674 void mpic_unmask_irq(struct irq_data *d)
676 unsigned int loops = 100000;
677 struct mpic *mpic = mpic_from_irq_data(d);
678 unsigned int src = mpic_irq_to_hw(d->irq);
680 DBG("%p: %s: enable_irq: %d (src %d)\n", mpic, mpic->name, d->irq, src);
682 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
683 mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) &
685 /* make sure mask gets to controller before we return to user */
688 printk(KERN_ERR "%s: timeout on hwirq %u\n",
692 } while(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK);
695 void mpic_mask_irq(struct irq_data *d)
697 unsigned int loops = 100000;
698 struct mpic *mpic = mpic_from_irq_data(d);
699 unsigned int src = mpic_irq_to_hw(d->irq);
701 DBG("%s: disable_irq: %d (src %d)\n", mpic->name, d->irq, src);
703 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
704 mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) |
707 /* make sure mask gets to controller before we return to user */
710 printk(KERN_ERR "%s: timeout on hwirq %u\n",
714 } while(!(mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI)) & MPIC_VECPRI_MASK));
717 void mpic_end_irq(struct irq_data *d)
719 struct mpic *mpic = mpic_from_irq_data(d);
722 DBG("%s: end_irq: %d\n", mpic->name, d->irq);
724 /* We always EOI on end_irq() even for edge interrupts since that
725 * should only lower the priority, the MPIC should have properly
726 * latched another edge interrupt coming in anyway
732 #ifdef CONFIG_MPIC_U3_HT_IRQS
734 static void mpic_unmask_ht_irq(struct irq_data *d)
736 struct mpic *mpic = mpic_from_irq_data(d);
737 unsigned int src = mpic_irq_to_hw(d->irq);
741 if (irqd_is_level_type(d))
742 mpic_ht_end_irq(mpic, src);
745 static unsigned int mpic_startup_ht_irq(struct irq_data *d)
747 struct mpic *mpic = mpic_from_irq_data(d);
748 unsigned int src = mpic_irq_to_hw(d->irq);
751 mpic_startup_ht_interrupt(mpic, src, irqd_is_level_type(d));
756 static void mpic_shutdown_ht_irq(struct irq_data *d)
758 struct mpic *mpic = mpic_from_irq_data(d);
759 unsigned int src = mpic_irq_to_hw(d->irq);
761 mpic_shutdown_ht_interrupt(mpic, src);
765 static void mpic_end_ht_irq(struct irq_data *d)
767 struct mpic *mpic = mpic_from_irq_data(d);
768 unsigned int src = mpic_irq_to_hw(d->irq);
771 DBG("%s: end_irq: %d\n", mpic->name, d->irq);
773 /* We always EOI on end_irq() even for edge interrupts since that
774 * should only lower the priority, the MPIC should have properly
775 * latched another edge interrupt coming in anyway
778 if (irqd_is_level_type(d))
779 mpic_ht_end_irq(mpic, src);
782 #endif /* !CONFIG_MPIC_U3_HT_IRQS */
786 static void mpic_unmask_ipi(struct irq_data *d)
788 struct mpic *mpic = mpic_from_ipi(d);
789 unsigned int src = mpic_irq_to_hw(d->irq) - mpic->ipi_vecs[0];
791 DBG("%s: enable_ipi: %d (ipi %d)\n", mpic->name, d->irq, src);
792 mpic_ipi_write(src, mpic_ipi_read(src) & ~MPIC_VECPRI_MASK);
795 static void mpic_mask_ipi(struct irq_data *d)
797 /* NEVER disable an IPI... that's just plain wrong! */
800 static void mpic_end_ipi(struct irq_data *d)
802 struct mpic *mpic = mpic_from_ipi(d);
805 * IPIs are marked IRQ_PER_CPU. This has the side effect of
806 * preventing the IRQ_PENDING/IRQ_INPROGRESS logic from
807 * applying to them. We EOI them late to avoid re-entering.
808 * We mark IPI's with IRQF_DISABLED as they must run with
814 #endif /* CONFIG_SMP */
816 int mpic_set_affinity(struct irq_data *d, const struct cpumask *cpumask,
819 struct mpic *mpic = mpic_from_irq_data(d);
820 unsigned int src = mpic_irq_to_hw(d->irq);
822 if (mpic->flags & MPIC_SINGLE_DEST_CPU) {
823 int cpuid = irq_choose_cpu(cpumask);
825 mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION), 1 << cpuid);
829 alloc_cpumask_var(&tmp, GFP_KERNEL);
831 cpumask_and(tmp, cpumask, cpu_online_mask);
833 mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION),
834 mpic_physmask(cpumask_bits(tmp)[0]));
836 free_cpumask_var(tmp);
842 static unsigned int mpic_type_to_vecpri(struct mpic *mpic, unsigned int type)
844 /* Now convert sense value */
845 switch(type & IRQ_TYPE_SENSE_MASK) {
846 case IRQ_TYPE_EDGE_RISING:
847 return MPIC_INFO(VECPRI_SENSE_EDGE) |
848 MPIC_INFO(VECPRI_POLARITY_POSITIVE);
849 case IRQ_TYPE_EDGE_FALLING:
850 case IRQ_TYPE_EDGE_BOTH:
851 return MPIC_INFO(VECPRI_SENSE_EDGE) |
852 MPIC_INFO(VECPRI_POLARITY_NEGATIVE);
853 case IRQ_TYPE_LEVEL_HIGH:
854 return MPIC_INFO(VECPRI_SENSE_LEVEL) |
855 MPIC_INFO(VECPRI_POLARITY_POSITIVE);
856 case IRQ_TYPE_LEVEL_LOW:
858 return MPIC_INFO(VECPRI_SENSE_LEVEL) |
859 MPIC_INFO(VECPRI_POLARITY_NEGATIVE);
863 int mpic_set_irq_type(struct irq_data *d, unsigned int flow_type)
865 struct mpic *mpic = mpic_from_irq_data(d);
866 unsigned int src = mpic_irq_to_hw(d->irq);
867 unsigned int vecpri, vold, vnew;
869 DBG("mpic: set_irq_type(mpic:@%p,virq:%d,src:0x%x,type:0x%x)\n",
870 mpic, d->irq, src, flow_type);
872 if (src >= mpic->irq_count)
875 if (flow_type == IRQ_TYPE_NONE)
876 if (mpic->senses && src < mpic->senses_count)
877 flow_type = mpic->senses[src];
878 if (flow_type == IRQ_TYPE_NONE)
879 flow_type = IRQ_TYPE_LEVEL_LOW;
881 irqd_set_trigger_type(d, flow_type);
883 if (mpic_is_ht_interrupt(mpic, src))
884 vecpri = MPIC_VECPRI_POLARITY_POSITIVE |
885 MPIC_VECPRI_SENSE_EDGE;
887 vecpri = mpic_type_to_vecpri(mpic, flow_type);
889 vold = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI));
890 vnew = vold & ~(MPIC_INFO(VECPRI_POLARITY_MASK) |
891 MPIC_INFO(VECPRI_SENSE_MASK));
894 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), vnew);
896 return IRQ_SET_MASK_OK_NOCOPY;;
899 void mpic_set_vector(unsigned int virq, unsigned int vector)
901 struct mpic *mpic = mpic_from_irq(virq);
902 unsigned int src = mpic_irq_to_hw(virq);
905 DBG("mpic: set_vector(mpic:@%p,virq:%d,src:%d,vector:0x%x)\n",
906 mpic, virq, src, vector);
908 if (src >= mpic->irq_count)
911 vecpri = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI));
912 vecpri = vecpri & ~MPIC_INFO(VECPRI_VECTOR_MASK);
914 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI), vecpri);
917 void mpic_set_destination(unsigned int virq, unsigned int cpuid)
919 struct mpic *mpic = mpic_from_irq(virq);
920 unsigned int src = mpic_irq_to_hw(virq);
922 DBG("mpic: set_destination(mpic:@%p,virq:%d,src:%d,cpuid:0x%x)\n",
923 mpic, virq, src, cpuid);
925 if (src >= mpic->irq_count)
928 mpic_irq_write(src, MPIC_INFO(IRQ_DESTINATION), 1 << cpuid);
931 static struct irq_chip mpic_irq_chip = {
932 .irq_mask = mpic_mask_irq,
933 .irq_unmask = mpic_unmask_irq,
934 .irq_eoi = mpic_end_irq,
935 .irq_set_type = mpic_set_irq_type,
939 static struct irq_chip mpic_ipi_chip = {
940 .irq_mask = mpic_mask_ipi,
941 .irq_unmask = mpic_unmask_ipi,
942 .irq_eoi = mpic_end_ipi,
944 #endif /* CONFIG_SMP */
946 #ifdef CONFIG_MPIC_U3_HT_IRQS
947 static struct irq_chip mpic_irq_ht_chip = {
948 .irq_startup = mpic_startup_ht_irq,
949 .irq_shutdown = mpic_shutdown_ht_irq,
950 .irq_mask = mpic_mask_irq,
951 .irq_unmask = mpic_unmask_ht_irq,
952 .irq_eoi = mpic_end_ht_irq,
953 .irq_set_type = mpic_set_irq_type,
955 #endif /* CONFIG_MPIC_U3_HT_IRQS */
958 static int mpic_host_match(struct irq_host *h, struct device_node *node)
960 /* Exact match, unless mpic node is NULL */
961 return h->of_node == NULL || h->of_node == node;
964 static int mpic_host_map(struct irq_host *h, unsigned int virq,
967 struct mpic *mpic = h->host_data;
968 struct irq_chip *chip;
970 DBG("mpic: map virq %d, hwirq 0x%lx\n", virq, hw);
972 if (hw == mpic->spurious_vec)
974 if (mpic->protected && test_bit(hw, mpic->protected))
978 else if (hw >= mpic->ipi_vecs[0]) {
979 WARN_ON(!(mpic->flags & MPIC_PRIMARY));
981 DBG("mpic: mapping as IPI\n");
982 irq_set_chip_data(virq, mpic);
983 irq_set_chip_and_handler(virq, &mpic->hc_ipi,
987 #endif /* CONFIG_SMP */
989 if (hw >= mpic->irq_count)
992 mpic_msi_reserve_hwirq(mpic, hw);
995 chip = &mpic->hc_irq;
997 #ifdef CONFIG_MPIC_U3_HT_IRQS
998 /* Check for HT interrupts, override vecpri */
999 if (mpic_is_ht_interrupt(mpic, hw))
1000 chip = &mpic->hc_ht_irq;
1001 #endif /* CONFIG_MPIC_U3_HT_IRQS */
1003 DBG("mpic: mapping to irq chip @%p\n", chip);
1005 irq_set_chip_data(virq, mpic);
1006 irq_set_chip_and_handler(virq, chip, handle_fasteoi_irq);
1008 /* Set default irq type */
1009 irq_set_irq_type(virq, IRQ_TYPE_NONE);
1011 /* If the MPIC was reset, then all vectors have already been
1012 * initialized. Otherwise, a per source lazy initialization
1015 if (!mpic_is_ipi(mpic, hw) && (mpic->flags & MPIC_NO_RESET)) {
1016 mpic_set_vector(virq, hw);
1017 mpic_set_destination(virq, mpic_processor_id(mpic));
1018 mpic_irq_set_priority(virq, 8);
1024 static int mpic_host_xlate(struct irq_host *h, struct device_node *ct,
1025 const u32 *intspec, unsigned int intsize,
1026 irq_hw_number_t *out_hwirq, unsigned int *out_flags)
1029 static unsigned char map_mpic_senses[4] = {
1030 IRQ_TYPE_EDGE_RISING,
1032 IRQ_TYPE_LEVEL_HIGH,
1033 IRQ_TYPE_EDGE_FALLING,
1036 *out_hwirq = intspec[0];
1040 /* Apple invented a new race of encoding on machines with
1041 * an HT APIC. They encode, among others, the index within
1042 * the HT APIC. We don't care about it here since thankfully,
1043 * it appears that they have the APIC already properly
1044 * configured, and thus our current fixup code that reads the
1045 * APIC config works fine. However, we still need to mask out
1046 * bits in the specifier to make sure we only get bit 0 which
1047 * is the level/edge bit (the only sense bit exposed by Apple),
1048 * as their bit 1 means something else.
1050 if (machine_is(powermac))
1052 *out_flags = map_mpic_senses[intspec[1] & mask];
1054 *out_flags = IRQ_TYPE_NONE;
1056 DBG("mpic: xlate (%d cells: 0x%08x 0x%08x) to line 0x%lx sense 0x%x\n",
1057 intsize, intspec[0], intspec[1], *out_hwirq, *out_flags);
1062 static struct irq_host_ops mpic_host_ops = {
1063 .match = mpic_host_match,
1064 .map = mpic_host_map,
1065 .xlate = mpic_host_xlate,
1068 static int mpic_reset_prohibited(struct device_node *node)
1070 return node && of_get_property(node, "pic-no-reset", NULL);
1074 * Exported functions
1077 struct mpic * __init mpic_alloc(struct device_node *node,
1078 phys_addr_t phys_addr,
1080 unsigned int isu_size,
1081 unsigned int irq_count,
1089 u64 paddr = phys_addr;
1091 mpic = kzalloc(sizeof(struct mpic), GFP_KERNEL);
1097 mpic->hc_irq = mpic_irq_chip;
1098 mpic->hc_irq.name = name;
1099 if (flags & MPIC_PRIMARY)
1100 mpic->hc_irq.irq_set_affinity = mpic_set_affinity;
1101 #ifdef CONFIG_MPIC_U3_HT_IRQS
1102 mpic->hc_ht_irq = mpic_irq_ht_chip;
1103 mpic->hc_ht_irq.name = name;
1104 if (flags & MPIC_PRIMARY)
1105 mpic->hc_ht_irq.irq_set_affinity = mpic_set_affinity;
1106 #endif /* CONFIG_MPIC_U3_HT_IRQS */
1109 mpic->hc_ipi = mpic_ipi_chip;
1110 mpic->hc_ipi.name = name;
1111 #endif /* CONFIG_SMP */
1113 mpic->flags = flags;
1114 mpic->isu_size = isu_size;
1115 mpic->irq_count = irq_count;
1116 mpic->num_sources = 0; /* so far */
1118 if (flags & MPIC_LARGE_VECTORS)
1123 mpic->timer_vecs[0] = intvec_top - 8;
1124 mpic->timer_vecs[1] = intvec_top - 7;
1125 mpic->timer_vecs[2] = intvec_top - 6;
1126 mpic->timer_vecs[3] = intvec_top - 5;
1127 mpic->ipi_vecs[0] = intvec_top - 4;
1128 mpic->ipi_vecs[1] = intvec_top - 3;
1129 mpic->ipi_vecs[2] = intvec_top - 2;
1130 mpic->ipi_vecs[3] = intvec_top - 1;
1131 mpic->spurious_vec = intvec_top;
1133 /* Check for "big-endian" in device-tree */
1134 if (node && of_get_property(node, "big-endian", NULL) != NULL)
1135 mpic->flags |= MPIC_BIG_ENDIAN;
1137 /* Look for protected sources */
1140 unsigned int bits, mapsize;
1142 of_get_property(node, "protected-sources", &psize);
1145 bits = intvec_top + 1;
1146 mapsize = BITS_TO_LONGS(bits) * sizeof(unsigned long);
1147 mpic->protected = kzalloc(mapsize, GFP_KERNEL);
1148 BUG_ON(mpic->protected == NULL);
1149 for (i = 0; i < psize; i++) {
1150 if (psrc[i] > intvec_top)
1152 __set_bit(psrc[i], mpic->protected);
1157 #ifdef CONFIG_MPIC_WEIRD
1158 mpic->hw_set = mpic_infos[MPIC_GET_REGSET(flags)];
1161 /* default register type */
1162 mpic->reg_type = (flags & MPIC_BIG_ENDIAN) ?
1163 mpic_access_mmio_be : mpic_access_mmio_le;
1165 /* If no physical address is passed in, a device-node is mandatory */
1166 BUG_ON(paddr == 0 && node == NULL);
1168 /* If no physical address passed in, check if it's dcr based */
1169 if (paddr == 0 && of_get_property(node, "dcr-reg", NULL) != NULL) {
1170 #ifdef CONFIG_PPC_DCR
1171 mpic->flags |= MPIC_USES_DCR;
1172 mpic->reg_type = mpic_access_dcr;
1175 #endif /* CONFIG_PPC_DCR */
1178 /* If the MPIC is not DCR based, and no physical address was passed
1179 * in, try to obtain one
1181 if (paddr == 0 && !(mpic->flags & MPIC_USES_DCR)) {
1182 const u32 *reg = of_get_property(node, "reg", NULL);
1183 BUG_ON(reg == NULL);
1184 paddr = of_translate_address(node, reg);
1185 BUG_ON(paddr == OF_BAD_ADDR);
1188 /* Map the global registers */
1189 mpic_map(mpic, node, paddr, &mpic->gregs, MPIC_INFO(GREG_BASE), 0x1000);
1190 mpic_map(mpic, node, paddr, &mpic->tmregs, MPIC_INFO(TIMER_BASE), 0x1000);
1194 /* When using a device-node, reset requests are only honored if the MPIC
1195 * is allowed to reset.
1197 if (mpic_reset_prohibited(node))
1198 mpic->flags |= MPIC_NO_RESET;
1200 if ((flags & MPIC_WANTS_RESET) && !(mpic->flags & MPIC_NO_RESET)) {
1201 printk(KERN_DEBUG "mpic: Resetting\n");
1202 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1203 mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1204 | MPIC_GREG_GCONF_RESET);
1205 while( mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1206 & MPIC_GREG_GCONF_RESET)
1211 if (flags & MPIC_ENABLE_COREINT)
1212 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1213 mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1214 | MPIC_GREG_GCONF_COREINT);
1216 if (flags & MPIC_ENABLE_MCK)
1217 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1218 mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1219 | MPIC_GREG_GCONF_MCK);
1221 /* Read feature register, calculate num CPUs and, for non-ISU
1222 * MPICs, num sources as well. On ISU MPICs, sources are counted
1225 greg_feature = mpic_read(mpic->gregs, MPIC_INFO(GREG_FEATURE_0));
1226 mpic->num_cpus = ((greg_feature & MPIC_GREG_FEATURE_LAST_CPU_MASK)
1227 >> MPIC_GREG_FEATURE_LAST_CPU_SHIFT) + 1;
1228 if (isu_size == 0) {
1229 if (flags & MPIC_BROKEN_FRR_NIRQS)
1230 mpic->num_sources = mpic->irq_count;
1233 ((greg_feature & MPIC_GREG_FEATURE_LAST_SRC_MASK)
1234 >> MPIC_GREG_FEATURE_LAST_SRC_SHIFT) + 1;
1237 /* Map the per-CPU registers */
1238 for (i = 0; i < mpic->num_cpus; i++) {
1239 mpic_map(mpic, node, paddr, &mpic->cpuregs[i],
1240 MPIC_INFO(CPU_BASE) + i * MPIC_INFO(CPU_STRIDE),
1244 /* Initialize main ISU if none provided */
1245 if (mpic->isu_size == 0) {
1246 mpic->isu_size = mpic->num_sources;
1247 mpic_map(mpic, node, paddr, &mpic->isus[0],
1248 MPIC_INFO(IRQ_BASE), MPIC_INFO(IRQ_STRIDE) * mpic->isu_size);
1250 mpic->isu_shift = 1 + __ilog2(mpic->isu_size - 1);
1251 mpic->isu_mask = (1 << mpic->isu_shift) - 1;
1253 mpic->irqhost = irq_alloc_host(node, IRQ_HOST_MAP_LINEAR,
1254 isu_size ? isu_size : mpic->num_sources,
1256 flags & MPIC_LARGE_VECTORS ? 2048 : 256);
1257 if (mpic->irqhost == NULL)
1260 mpic->irqhost->host_data = mpic;
1262 /* Display version */
1263 switch (greg_feature & MPIC_GREG_FEATURE_VERSION_MASK) {
1277 printk(KERN_INFO "mpic: Setting up MPIC \"%s\" version %s at %llx,"
1279 name, vers, (unsigned long long)paddr, mpic->num_cpus);
1280 printk(KERN_INFO "mpic: ISU size: %d, shift: %d, mask: %x\n",
1281 mpic->isu_size, mpic->isu_shift, mpic->isu_mask);
1286 if (flags & MPIC_PRIMARY) {
1287 mpic_primary = mpic;
1288 irq_set_default_host(mpic->irqhost);
1294 void __init mpic_assign_isu(struct mpic *mpic, unsigned int isu_num,
1297 unsigned int isu_first = isu_num * mpic->isu_size;
1299 BUG_ON(isu_num >= MPIC_MAX_ISU);
1301 mpic_map(mpic, mpic->irqhost->of_node,
1302 paddr, &mpic->isus[isu_num], 0,
1303 MPIC_INFO(IRQ_STRIDE) * mpic->isu_size);
1305 if ((isu_first + mpic->isu_size) > mpic->num_sources)
1306 mpic->num_sources = isu_first + mpic->isu_size;
1309 void __init mpic_set_default_senses(struct mpic *mpic, u8 *senses, int count)
1311 mpic->senses = senses;
1312 mpic->senses_count = count;
1315 void __init mpic_init(struct mpic *mpic)
1320 BUG_ON(mpic->num_sources == 0);
1322 printk(KERN_INFO "mpic: Initializing for %d sources\n", mpic->num_sources);
1324 /* Set current processor priority to max */
1325 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf);
1327 /* Initialize timers: just disable them all */
1328 for (i = 0; i < 4; i++) {
1329 mpic_write(mpic->tmregs,
1330 i * MPIC_INFO(TIMER_STRIDE) +
1331 MPIC_INFO(TIMER_DESTINATION), 0);
1332 mpic_write(mpic->tmregs,
1333 i * MPIC_INFO(TIMER_STRIDE) +
1334 MPIC_INFO(TIMER_VECTOR_PRI),
1336 (mpic->timer_vecs[0] + i));
1339 /* Initialize IPIs to our reserved vectors and mark them disabled for now */
1340 mpic_test_broken_ipi(mpic);
1341 for (i = 0; i < 4; i++) {
1344 (10 << MPIC_VECPRI_PRIORITY_SHIFT) |
1345 (mpic->ipi_vecs[0] + i));
1348 /* Initialize interrupt sources */
1349 if (mpic->irq_count == 0)
1350 mpic->irq_count = mpic->num_sources;
1352 /* Do the HT PIC fixups on U3 broken mpic */
1353 DBG("MPIC flags: %x\n", mpic->flags);
1354 if ((mpic->flags & MPIC_U3_HT_IRQS) && (mpic->flags & MPIC_PRIMARY)) {
1355 mpic_scan_ht_pics(mpic);
1356 mpic_u3msi_init(mpic);
1359 mpic_pasemi_msi_init(mpic);
1361 cpu = mpic_processor_id(mpic);
1363 if (!(mpic->flags & MPIC_NO_RESET)) {
1364 for (i = 0; i < mpic->num_sources; i++) {
1365 /* start with vector = source number, and masked */
1366 u32 vecpri = MPIC_VECPRI_MASK | i |
1367 (8 << MPIC_VECPRI_PRIORITY_SHIFT);
1369 /* check if protected */
1370 if (mpic->protected && test_bit(i, mpic->protected))
1373 mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI), vecpri);
1374 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION), 1 << cpu);
1378 /* Init spurious vector */
1379 mpic_write(mpic->gregs, MPIC_INFO(GREG_SPURIOUS), mpic->spurious_vec);
1381 /* Disable 8259 passthrough, if supported */
1382 if (!(mpic->flags & MPIC_NO_PTHROU_DIS))
1383 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1384 mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1385 | MPIC_GREG_GCONF_8259_PTHROU_DIS);
1387 if (mpic->flags & MPIC_NO_BIAS)
1388 mpic_write(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0),
1389 mpic_read(mpic->gregs, MPIC_INFO(GREG_GLOBAL_CONF_0))
1390 | MPIC_GREG_GCONF_NO_BIAS);
1392 /* Set current processor priority to 0 */
1393 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0);
1396 /* allocate memory to save mpic state */
1397 mpic->save_data = kmalloc(mpic->num_sources * sizeof(*mpic->save_data),
1399 BUG_ON(mpic->save_data == NULL);
1403 void __init mpic_set_clk_ratio(struct mpic *mpic, u32 clock_ratio)
1407 v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1);
1408 v &= ~MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO_MASK;
1409 v |= MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO(clock_ratio);
1410 mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v);
1413 void __init mpic_set_serial_int(struct mpic *mpic, int enable)
1415 unsigned long flags;
1418 raw_spin_lock_irqsave(&mpic_lock, flags);
1419 v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1);
1421 v |= MPIC_GREG_GLOBAL_CONF_1_SIE;
1423 v &= ~MPIC_GREG_GLOBAL_CONF_1_SIE;
1424 mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v);
1425 raw_spin_unlock_irqrestore(&mpic_lock, flags);
1428 void mpic_irq_set_priority(unsigned int irq, unsigned int pri)
1430 struct mpic *mpic = mpic_find(irq);
1431 unsigned int src = mpic_irq_to_hw(irq);
1432 unsigned long flags;
1438 raw_spin_lock_irqsave(&mpic_lock, flags);
1439 if (mpic_is_ipi(mpic, irq)) {
1440 reg = mpic_ipi_read(src - mpic->ipi_vecs[0]) &
1441 ~MPIC_VECPRI_PRIORITY_MASK;
1442 mpic_ipi_write(src - mpic->ipi_vecs[0],
1443 reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
1445 reg = mpic_irq_read(src, MPIC_INFO(IRQ_VECTOR_PRI))
1446 & ~MPIC_VECPRI_PRIORITY_MASK;
1447 mpic_irq_write(src, MPIC_INFO(IRQ_VECTOR_PRI),
1448 reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
1450 raw_spin_unlock_irqrestore(&mpic_lock, flags);
1453 void mpic_setup_this_cpu(void)
1456 struct mpic *mpic = mpic_primary;
1457 unsigned long flags;
1458 u32 msk = 1 << hard_smp_processor_id();
1461 BUG_ON(mpic == NULL);
1463 DBG("%s: setup_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
1465 raw_spin_lock_irqsave(&mpic_lock, flags);
1467 /* let the mpic know we want intrs. default affinity is 0xffffffff
1468 * until changed via /proc. That's how it's done on x86. If we want
1469 * it differently, then we should make sure we also change the default
1470 * values of irq_desc[].affinity in irq.c.
1472 if (distribute_irqs) {
1473 for (i = 0; i < mpic->num_sources ; i++)
1474 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1475 mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) | msk);
1478 /* Set current processor priority to 0 */
1479 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0);
1481 raw_spin_unlock_irqrestore(&mpic_lock, flags);
1482 #endif /* CONFIG_SMP */
1485 int mpic_cpu_get_priority(void)
1487 struct mpic *mpic = mpic_primary;
1489 return mpic_cpu_read(MPIC_INFO(CPU_CURRENT_TASK_PRI));
1492 void mpic_cpu_set_priority(int prio)
1494 struct mpic *mpic = mpic_primary;
1496 prio &= MPIC_CPU_TASKPRI_MASK;
1497 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), prio);
1500 void mpic_teardown_this_cpu(int secondary)
1502 struct mpic *mpic = mpic_primary;
1503 unsigned long flags;
1504 u32 msk = 1 << hard_smp_processor_id();
1507 BUG_ON(mpic == NULL);
1509 DBG("%s: teardown_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
1510 raw_spin_lock_irqsave(&mpic_lock, flags);
1512 /* let the mpic know we don't want intrs. */
1513 for (i = 0; i < mpic->num_sources ; i++)
1514 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1515 mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION)) & ~msk);
1517 /* Set current processor priority to max */
1518 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI), 0xf);
1519 /* We need to EOI the IPI since not all platforms reset the MPIC
1520 * on boot and new interrupts wouldn't get delivered otherwise.
1524 raw_spin_unlock_irqrestore(&mpic_lock, flags);
1528 static unsigned int _mpic_get_one_irq(struct mpic *mpic, int reg)
1532 src = mpic_cpu_read(reg) & MPIC_INFO(VECPRI_VECTOR_MASK);
1534 DBG("%s: get_one_irq(reg 0x%x): %d\n", mpic->name, reg, src);
1536 if (unlikely(src == mpic->spurious_vec)) {
1537 if (mpic->flags & MPIC_SPV_EOI)
1541 if (unlikely(mpic->protected && test_bit(src, mpic->protected))) {
1542 if (printk_ratelimit())
1543 printk(KERN_WARNING "%s: Got protected source %d !\n",
1544 mpic->name, (int)src);
1549 return irq_linear_revmap(mpic->irqhost, src);
1552 unsigned int mpic_get_one_irq(struct mpic *mpic)
1554 return _mpic_get_one_irq(mpic, MPIC_INFO(CPU_INTACK));
1557 unsigned int mpic_get_irq(void)
1559 struct mpic *mpic = mpic_primary;
1561 BUG_ON(mpic == NULL);
1563 return mpic_get_one_irq(mpic);
1566 unsigned int mpic_get_coreint_irq(void)
1569 struct mpic *mpic = mpic_primary;
1572 BUG_ON(mpic == NULL);
1574 src = mfspr(SPRN_EPR);
1576 if (unlikely(src == mpic->spurious_vec)) {
1577 if (mpic->flags & MPIC_SPV_EOI)
1581 if (unlikely(mpic->protected && test_bit(src, mpic->protected))) {
1582 if (printk_ratelimit())
1583 printk(KERN_WARNING "%s: Got protected source %d !\n",
1584 mpic->name, (int)src);
1588 return irq_linear_revmap(mpic->irqhost, src);
1594 unsigned int mpic_get_mcirq(void)
1596 struct mpic *mpic = mpic_primary;
1598 BUG_ON(mpic == NULL);
1600 return _mpic_get_one_irq(mpic, MPIC_INFO(CPU_MCACK));
1604 void mpic_request_ipis(void)
1606 struct mpic *mpic = mpic_primary;
1608 BUG_ON(mpic == NULL);
1610 printk(KERN_INFO "mpic: requesting IPIs...\n");
1612 for (i = 0; i < 4; i++) {
1613 unsigned int vipi = irq_create_mapping(mpic->irqhost,
1614 mpic->ipi_vecs[0] + i);
1615 if (vipi == NO_IRQ) {
1616 printk(KERN_ERR "Failed to map %s\n", smp_ipi_name[i]);
1619 smp_request_message_ipi(vipi, i);
1623 static void mpic_send_ipi(unsigned int ipi_no, const struct cpumask *cpu_mask)
1625 struct mpic *mpic = mpic_primary;
1627 BUG_ON(mpic == NULL);
1630 DBG("%s: send_ipi(ipi_no: %d)\n", mpic->name, ipi_no);
1633 mpic_cpu_write(MPIC_INFO(CPU_IPI_DISPATCH_0) +
1634 ipi_no * MPIC_INFO(CPU_IPI_DISPATCH_STRIDE),
1635 mpic_physmask(cpumask_bits(cpu_mask)[0]));
1638 void smp_mpic_message_pass(int target, int msg)
1642 /* make sure we're sending something that translates to an IPI */
1643 if ((unsigned int)msg > 3) {
1644 printk("SMP %d: smp_message_pass: unknown msg %d\n",
1645 smp_processor_id(), msg);
1650 mpic_send_ipi(msg, cpu_online_mask);
1652 case MSG_ALL_BUT_SELF:
1653 alloc_cpumask_var(&tmp, GFP_NOWAIT);
1654 cpumask_andnot(tmp, cpu_online_mask,
1655 cpumask_of(smp_processor_id()));
1656 mpic_send_ipi(msg, tmp);
1657 free_cpumask_var(tmp);
1660 mpic_send_ipi(msg, cpumask_of(target));
1665 int __init smp_mpic_probe(void)
1669 DBG("smp_mpic_probe()...\n");
1671 nr_cpus = cpumask_weight(cpu_possible_mask);
1673 DBG("nr_cpus: %d\n", nr_cpus);
1676 mpic_request_ipis();
1681 void __devinit smp_mpic_setup_cpu(int cpu)
1683 mpic_setup_this_cpu();
1686 void mpic_reset_core(int cpu)
1688 struct mpic *mpic = mpic_primary;
1690 int cpuid = get_hard_smp_processor_id(cpu);
1692 /* Set target bit for core reset */
1693 pir = mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT));
1694 pir |= (1 << cpuid);
1695 mpic_write(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT), pir);
1696 mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT));
1698 /* Restore target bit after reset complete */
1699 pir &= ~(1 << cpuid);
1700 mpic_write(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT), pir);
1701 mpic_read(mpic->gregs, MPIC_INFO(GREG_PROCESSOR_INIT));
1703 #endif /* CONFIG_SMP */
1706 static void mpic_suspend_one(struct mpic *mpic)
1710 for (i = 0; i < mpic->num_sources; i++) {
1711 mpic->save_data[i].vecprio =
1712 mpic_irq_read(i, MPIC_INFO(IRQ_VECTOR_PRI));
1713 mpic->save_data[i].dest =
1714 mpic_irq_read(i, MPIC_INFO(IRQ_DESTINATION));
1718 static int mpic_suspend(void)
1720 struct mpic *mpic = mpics;
1723 mpic_suspend_one(mpic);
1730 static void mpic_resume_one(struct mpic *mpic)
1734 for (i = 0; i < mpic->num_sources; i++) {
1735 mpic_irq_write(i, MPIC_INFO(IRQ_VECTOR_PRI),
1736 mpic->save_data[i].vecprio);
1737 mpic_irq_write(i, MPIC_INFO(IRQ_DESTINATION),
1738 mpic->save_data[i].dest);
1740 #ifdef CONFIG_MPIC_U3_HT_IRQS
1742 struct mpic_irq_fixup *fixup = &mpic->fixups[i];
1745 /* we use the lowest bit in an inverted meaning */
1746 if ((mpic->save_data[i].fixup_data & 1) == 0)
1749 /* Enable and configure */
1750 writeb(0x10 + 2 * fixup->index, fixup->base + 2);
1752 writel(mpic->save_data[i].fixup_data & ~1,
1757 } /* end for loop */
1760 static void mpic_resume(void)
1762 struct mpic *mpic = mpics;
1765 mpic_resume_one(mpic);
1770 static struct syscore_ops mpic_syscore_ops = {
1771 .resume = mpic_resume,
1772 .suspend = mpic_suspend,
1775 static int mpic_init_sys(void)
1777 register_syscore_ops(&mpic_syscore_ops);
1781 device_initcall(mpic_init_sys);