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();
103 return _mpic_read(mpic->flags & MPIC_BIG_ENDIAN,
104 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 #define mpic_irq_to_hw(virq) ((unsigned int)irq_map[virq].hwirq)
345 /* Find an mpic associated with a given linux interrupt */
346 static struct mpic *mpic_find(unsigned int irq, unsigned int *is_ipi)
348 unsigned int src = mpic_irq_to_hw(irq);
350 if (irq < NUM_ISA_INTERRUPTS)
353 *is_ipi = (src >= MPIC_VEC_IPI_0 && src <= MPIC_VEC_IPI_3);
355 return irq_desc[irq].chip_data;
358 /* Convert a cpu mask from logical to physical cpu numbers. */
359 static inline u32 mpic_physmask(u32 cpumask)
364 for (i = 0; i < NR_CPUS; ++i, cpumask >>= 1)
365 mask |= (cpumask & 1) << get_hard_smp_processor_id(i);
370 /* Get the mpic structure from the IPI number */
371 static inline struct mpic * mpic_from_ipi(unsigned int ipi)
373 return irq_desc[ipi].chip_data;
377 /* Get the mpic structure from the irq number */
378 static inline struct mpic * mpic_from_irq(unsigned int irq)
380 return irq_desc[irq].chip_data;
384 static inline void mpic_eoi(struct mpic *mpic)
386 mpic_cpu_write(MPIC_CPU_EOI, 0);
387 (void)mpic_cpu_read(MPIC_CPU_WHOAMI);
391 static irqreturn_t mpic_ipi_action(int irq, void *dev_id, struct pt_regs *regs)
393 smp_message_recv(mpic_irq_to_hw(irq) - MPIC_VEC_IPI_0, regs);
396 #endif /* CONFIG_SMP */
399 * Linux descriptor level callbacks
403 static void mpic_unmask_irq(unsigned int irq)
405 unsigned int loops = 100000;
406 struct mpic *mpic = mpic_from_irq(irq);
407 unsigned int src = mpic_irq_to_hw(irq);
409 DBG("%p: %s: enable_irq: %d (src %d)\n", mpic, mpic->name, irq, src);
411 mpic_irq_write(src, MPIC_IRQ_VECTOR_PRI,
412 mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI) &
415 /* make sure mask gets to controller before we return to user */
418 printk(KERN_ERR "mpic_enable_irq timeout\n");
421 } while(mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI) & MPIC_VECPRI_MASK);
424 static void mpic_mask_irq(unsigned int irq)
426 unsigned int loops = 100000;
427 struct mpic *mpic = mpic_from_irq(irq);
428 unsigned int src = mpic_irq_to_hw(irq);
430 DBG("%s: disable_irq: %d (src %d)\n", mpic->name, irq, src);
432 mpic_irq_write(src, MPIC_IRQ_VECTOR_PRI,
433 mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI) |
436 /* make sure mask gets to controller before we return to user */
439 printk(KERN_ERR "mpic_enable_irq timeout\n");
442 } while(!(mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI) & MPIC_VECPRI_MASK));
445 static void mpic_end_irq(unsigned int irq)
447 struct mpic *mpic = mpic_from_irq(irq);
450 DBG("%s: end_irq: %d\n", mpic->name, irq);
452 /* We always EOI on end_irq() even for edge interrupts since that
453 * should only lower the priority, the MPIC should have properly
454 * latched another edge interrupt coming in anyway
460 #ifdef CONFIG_MPIC_BROKEN_U3
462 static void mpic_unmask_ht_irq(unsigned int irq)
464 struct mpic *mpic = mpic_from_irq(irq);
465 unsigned int src = mpic_irq_to_hw(irq);
467 mpic_unmask_irq(irq);
469 if (irq_desc[irq].status & IRQ_LEVEL)
470 mpic_ht_end_irq(mpic, src);
473 static unsigned int mpic_startup_ht_irq(unsigned int irq)
475 struct mpic *mpic = mpic_from_irq(irq);
476 unsigned int src = mpic_irq_to_hw(irq);
478 mpic_unmask_irq(irq);
479 mpic_startup_ht_interrupt(mpic, src, irq_desc[irq].status);
484 static void mpic_shutdown_ht_irq(unsigned int irq)
486 struct mpic *mpic = mpic_from_irq(irq);
487 unsigned int src = mpic_irq_to_hw(irq);
489 mpic_shutdown_ht_interrupt(mpic, src, irq_desc[irq].status);
493 static void mpic_end_ht_irq(unsigned int irq)
495 struct mpic *mpic = mpic_from_irq(irq);
496 unsigned int src = mpic_irq_to_hw(irq);
499 DBG("%s: end_irq: %d\n", mpic->name, irq);
501 /* We always EOI on end_irq() even for edge interrupts since that
502 * should only lower the priority, the MPIC should have properly
503 * latched another edge interrupt coming in anyway
506 if (irq_desc[irq].status & IRQ_LEVEL)
507 mpic_ht_end_irq(mpic, src);
511 #endif /* CONFIG_MPIC_BROKEN_U3 */
515 static void mpic_unmask_ipi(unsigned int irq)
517 struct mpic *mpic = mpic_from_ipi(irq);
518 unsigned int src = mpic_irq_to_hw(irq) - MPIC_VEC_IPI_0;
520 DBG("%s: enable_ipi: %d (ipi %d)\n", mpic->name, irq, src);
521 mpic_ipi_write(src, mpic_ipi_read(src) & ~MPIC_VECPRI_MASK);
524 static void mpic_mask_ipi(unsigned int irq)
526 /* NEVER disable an IPI... that's just plain wrong! */
529 static void mpic_end_ipi(unsigned int irq)
531 struct mpic *mpic = mpic_from_ipi(irq);
534 * IPIs are marked IRQ_PER_CPU. This has the side effect of
535 * preventing the IRQ_PENDING/IRQ_INPROGRESS logic from
536 * applying to them. We EOI them late to avoid re-entering.
537 * We mark IPI's with IRQF_DISABLED as they must run with
543 #endif /* CONFIG_SMP */
545 static void mpic_set_affinity(unsigned int irq, cpumask_t cpumask)
547 struct mpic *mpic = mpic_from_irq(irq);
548 unsigned int src = mpic_irq_to_hw(irq);
552 cpus_and(tmp, cpumask, cpu_online_map);
554 mpic_irq_write(src, MPIC_IRQ_DESTINATION,
555 mpic_physmask(cpus_addr(tmp)[0]));
558 static unsigned int mpic_flags_to_vecpri(unsigned int flags, int *level)
562 /* Now convert sense value */
563 switch(flags & IRQ_TYPE_SENSE_MASK) {
564 case IRQ_TYPE_EDGE_RISING:
565 vecpri = MPIC_VECPRI_SENSE_EDGE |
566 MPIC_VECPRI_POLARITY_POSITIVE;
569 case IRQ_TYPE_EDGE_FALLING:
570 vecpri = MPIC_VECPRI_SENSE_EDGE |
571 MPIC_VECPRI_POLARITY_NEGATIVE;
574 case IRQ_TYPE_LEVEL_HIGH:
575 vecpri = MPIC_VECPRI_SENSE_LEVEL |
576 MPIC_VECPRI_POLARITY_POSITIVE;
579 case IRQ_TYPE_LEVEL_LOW:
581 vecpri = MPIC_VECPRI_SENSE_LEVEL |
582 MPIC_VECPRI_POLARITY_NEGATIVE;
588 static struct irq_chip mpic_irq_chip = {
589 .mask = mpic_mask_irq,
590 .unmask = mpic_unmask_irq,
595 static struct irq_chip mpic_ipi_chip = {
596 .mask = mpic_mask_ipi,
597 .unmask = mpic_unmask_ipi,
600 #endif /* CONFIG_SMP */
602 #ifdef CONFIG_MPIC_BROKEN_U3
603 static struct irq_chip mpic_irq_ht_chip = {
604 .startup = mpic_startup_ht_irq,
605 .shutdown = mpic_shutdown_ht_irq,
606 .mask = mpic_mask_irq,
607 .unmask = mpic_unmask_ht_irq,
608 .eoi = mpic_end_ht_irq,
610 #endif /* CONFIG_MPIC_BROKEN_U3 */
613 static int mpic_host_match(struct irq_host *h, struct device_node *node)
615 struct mpic *mpic = h->host_data;
617 /* Exact match, unless mpic node is NULL */
618 return mpic->of_node == NULL || mpic->of_node == node;
621 static int mpic_host_map(struct irq_host *h, unsigned int virq,
622 irq_hw_number_t hw, unsigned int flags)
624 struct irq_desc *desc = get_irq_desc(virq);
625 struct irq_chip *chip;
626 struct mpic *mpic = h->host_data;
627 unsigned int vecpri = MPIC_VECPRI_SENSE_LEVEL |
628 MPIC_VECPRI_POLARITY_NEGATIVE;
631 pr_debug("mpic: map virq %d, hwirq 0x%lx, flags: 0x%x\n",
634 if (hw == MPIC_VEC_SPURRIOUS)
637 else if (hw >= MPIC_VEC_IPI_0) {
638 WARN_ON(!(mpic->flags & MPIC_PRIMARY));
640 pr_debug("mpic: mapping as IPI\n");
641 set_irq_chip_data(virq, mpic);
642 set_irq_chip_and_handler(virq, &mpic->hc_ipi,
646 #endif /* CONFIG_SMP */
648 if (hw >= mpic->irq_count)
651 /* If no sense provided, check default sense array */
652 if (((flags & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_NONE) &&
653 mpic->senses && hw < mpic->senses_count)
654 flags |= mpic->senses[hw];
656 vecpri = mpic_flags_to_vecpri(flags, &level);
658 desc->status |= IRQ_LEVEL;
659 chip = &mpic->hc_irq;
661 #ifdef CONFIG_MPIC_BROKEN_U3
662 /* Check for HT interrupts, override vecpri */
663 if (mpic_is_ht_interrupt(mpic, hw)) {
664 vecpri &= ~(MPIC_VECPRI_SENSE_MASK |
665 MPIC_VECPRI_POLARITY_MASK);
666 vecpri |= MPIC_VECPRI_POLARITY_POSITIVE;
667 chip = &mpic->hc_ht_irq;
671 /* Reconfigure irq */
672 vecpri |= MPIC_VECPRI_MASK | hw | (8 << MPIC_VECPRI_PRIORITY_SHIFT);
673 mpic_irq_write(hw, MPIC_IRQ_VECTOR_PRI, vecpri);
675 pr_debug("mpic: mapping as IRQ\n");
677 set_irq_chip_data(virq, mpic);
678 set_irq_chip_and_handler(virq, chip, handle_fasteoi_irq);
682 static int mpic_host_xlate(struct irq_host *h, struct device_node *ct,
683 u32 *intspec, unsigned int intsize,
684 irq_hw_number_t *out_hwirq, unsigned int *out_flags)
687 static unsigned char map_mpic_senses[4] = {
688 IRQ_TYPE_EDGE_RISING,
691 IRQ_TYPE_EDGE_FALLING,
694 *out_hwirq = intspec[0];
695 if (intsize > 1 && intspec[1] < 4)
696 *out_flags = map_mpic_senses[intspec[1]];
698 *out_flags = IRQ_TYPE_NONE;
703 static struct irq_host_ops mpic_host_ops = {
704 .match = mpic_host_match,
705 .map = mpic_host_map,
706 .xlate = mpic_host_xlate,
713 struct mpic * __init mpic_alloc(struct device_node *node,
714 unsigned long phys_addr,
716 unsigned int isu_size,
717 unsigned int irq_count,
725 mpic = alloc_bootmem(sizeof(struct mpic));
729 memset(mpic, 0, sizeof(struct mpic));
731 mpic->of_node = node ? of_node_get(node) : NULL;
733 mpic->irqhost = irq_alloc_host(IRQ_HOST_MAP_LINEAR, 256,
736 if (mpic->irqhost == NULL) {
741 mpic->irqhost->host_data = mpic;
742 mpic->hc_irq = mpic_irq_chip;
743 mpic->hc_irq.typename = name;
744 if (flags & MPIC_PRIMARY)
745 mpic->hc_irq.set_affinity = mpic_set_affinity;
746 #ifdef CONFIG_MPIC_BROKEN_U3
747 mpic->hc_ht_irq = mpic_irq_ht_chip;
748 mpic->hc_ht_irq.typename = name;
749 if (flags & MPIC_PRIMARY)
750 mpic->hc_ht_irq.set_affinity = mpic_set_affinity;
751 #endif /* CONFIG_MPIC_BROKEN_U3 */
753 mpic->hc_ipi = mpic_ipi_chip;
754 mpic->hc_ipi.typename = name;
755 #endif /* CONFIG_SMP */
758 mpic->isu_size = isu_size;
759 mpic->irq_count = irq_count;
760 mpic->num_sources = 0; /* so far */
762 /* Map the global registers */
763 mpic->gregs = ioremap(phys_addr + MPIC_GREG_BASE, 0x1000);
764 mpic->tmregs = mpic->gregs + ((MPIC_TIMER_BASE - MPIC_GREG_BASE) >> 2);
765 BUG_ON(mpic->gregs == NULL);
768 if (flags & MPIC_WANTS_RESET) {
769 mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_0,
770 mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_0)
771 | MPIC_GREG_GCONF_RESET);
772 while( mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_0)
773 & MPIC_GREG_GCONF_RESET)
777 /* Read feature register, calculate num CPUs and, for non-ISU
778 * MPICs, num sources as well. On ISU MPICs, sources are counted
781 reg = mpic_read(mpic->gregs, MPIC_GREG_FEATURE_0);
782 mpic->num_cpus = ((reg & MPIC_GREG_FEATURE_LAST_CPU_MASK)
783 >> MPIC_GREG_FEATURE_LAST_CPU_SHIFT) + 1;
785 mpic->num_sources = ((reg & MPIC_GREG_FEATURE_LAST_SRC_MASK)
786 >> MPIC_GREG_FEATURE_LAST_SRC_SHIFT) + 1;
788 /* Map the per-CPU registers */
789 for (i = 0; i < mpic->num_cpus; i++) {
790 mpic->cpuregs[i] = ioremap(phys_addr + MPIC_CPU_BASE +
791 i * MPIC_CPU_STRIDE, 0x1000);
792 BUG_ON(mpic->cpuregs[i] == NULL);
795 /* Initialize main ISU if none provided */
796 if (mpic->isu_size == 0) {
797 mpic->isu_size = mpic->num_sources;
798 mpic->isus[0] = ioremap(phys_addr + MPIC_IRQ_BASE,
799 MPIC_IRQ_STRIDE * mpic->isu_size);
800 BUG_ON(mpic->isus[0] == NULL);
802 mpic->isu_shift = 1 + __ilog2(mpic->isu_size - 1);
803 mpic->isu_mask = (1 << mpic->isu_shift) - 1;
805 /* Display version */
806 switch (reg & MPIC_GREG_FEATURE_VERSION_MASK) {
820 printk(KERN_INFO "mpic: Setting up MPIC \"%s\" version %s at %lx, max %d CPUs\n",
821 name, vers, phys_addr, mpic->num_cpus);
822 printk(KERN_INFO "mpic: ISU size: %d, shift: %d, mask: %x\n", mpic->isu_size,
823 mpic->isu_shift, mpic->isu_mask);
828 if (flags & MPIC_PRIMARY) {
830 irq_set_default_host(mpic->irqhost);
836 void __init mpic_assign_isu(struct mpic *mpic, unsigned int isu_num,
837 unsigned long phys_addr)
839 unsigned int isu_first = isu_num * mpic->isu_size;
841 BUG_ON(isu_num >= MPIC_MAX_ISU);
843 mpic->isus[isu_num] = ioremap(phys_addr, MPIC_IRQ_STRIDE * mpic->isu_size);
844 if ((isu_first + mpic->isu_size) > mpic->num_sources)
845 mpic->num_sources = isu_first + mpic->isu_size;
848 void __init mpic_set_default_senses(struct mpic *mpic, u8 *senses, int count)
850 mpic->senses = senses;
851 mpic->senses_count = count;
854 void __init mpic_init(struct mpic *mpic)
858 BUG_ON(mpic->num_sources == 0);
859 WARN_ON(mpic->num_sources > MPIC_VEC_IPI_0);
861 /* Sanitize source count */
862 if (mpic->num_sources > MPIC_VEC_IPI_0)
863 mpic->num_sources = MPIC_VEC_IPI_0;
865 printk(KERN_INFO "mpic: Initializing for %d sources\n", mpic->num_sources);
867 /* Set current processor priority to max */
868 mpic_cpu_write(MPIC_CPU_CURRENT_TASK_PRI, 0xf);
870 /* Initialize timers: just disable them all */
871 for (i = 0; i < 4; i++) {
872 mpic_write(mpic->tmregs,
873 i * MPIC_TIMER_STRIDE + MPIC_TIMER_DESTINATION, 0);
874 mpic_write(mpic->tmregs,
875 i * MPIC_TIMER_STRIDE + MPIC_TIMER_VECTOR_PRI,
877 (MPIC_VEC_TIMER_0 + i));
880 /* Initialize IPIs to our reserved vectors and mark them disabled for now */
881 mpic_test_broken_ipi(mpic);
882 for (i = 0; i < 4; i++) {
885 (10 << MPIC_VECPRI_PRIORITY_SHIFT) |
886 (MPIC_VEC_IPI_0 + i));
889 /* Initialize interrupt sources */
890 if (mpic->irq_count == 0)
891 mpic->irq_count = mpic->num_sources;
893 #ifdef CONFIG_MPIC_BROKEN_U3
894 /* Do the HT PIC fixups on U3 broken mpic */
895 DBG("MPIC flags: %x\n", mpic->flags);
896 if ((mpic->flags & MPIC_BROKEN_U3) && (mpic->flags & MPIC_PRIMARY))
897 mpic_scan_ht_pics(mpic);
898 #endif /* CONFIG_MPIC_BROKEN_U3 */
900 for (i = 0; i < mpic->num_sources; i++) {
901 /* start with vector = source number, and masked */
902 u32 vecpri = MPIC_VECPRI_MASK | i | (8 << MPIC_VECPRI_PRIORITY_SHIFT);
905 /* do senses munging */
906 if (mpic->senses && i < mpic->senses_count)
907 vecpri = mpic_flags_to_vecpri(mpic->senses[i],
910 vecpri |= MPIC_VECPRI_SENSE_LEVEL;
912 /* deal with broken U3 */
913 if (mpic->flags & MPIC_BROKEN_U3) {
914 #ifdef CONFIG_MPIC_BROKEN_U3
915 if (mpic_is_ht_interrupt(mpic, i)) {
916 vecpri &= ~(MPIC_VECPRI_SENSE_MASK |
917 MPIC_VECPRI_POLARITY_MASK);
918 vecpri |= MPIC_VECPRI_POLARITY_POSITIVE;
921 printk(KERN_ERR "mpic: BROKEN_U3 set, but CONFIG doesn't match\n");
925 DBG("setup source %d, vecpri: %08x, level: %d\n", i, vecpri,
929 mpic_irq_write(i, MPIC_IRQ_VECTOR_PRI, vecpri);
930 mpic_irq_write(i, MPIC_IRQ_DESTINATION,
931 1 << hard_smp_processor_id());
934 /* Init spurrious vector */
935 mpic_write(mpic->gregs, MPIC_GREG_SPURIOUS, MPIC_VEC_SPURRIOUS);
937 /* Disable 8259 passthrough */
938 mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_0,
939 mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_0)
940 | MPIC_GREG_GCONF_8259_PTHROU_DIS);
942 /* Set current processor priority to 0 */
943 mpic_cpu_write(MPIC_CPU_CURRENT_TASK_PRI, 0);
946 void __init mpic_set_clk_ratio(struct mpic *mpic, u32 clock_ratio)
950 v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1);
951 v &= ~MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO_MASK;
952 v |= MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO(clock_ratio);
953 mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v);
956 void __init mpic_set_serial_int(struct mpic *mpic, int enable)
960 v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1);
962 v |= MPIC_GREG_GLOBAL_CONF_1_SIE;
964 v &= ~MPIC_GREG_GLOBAL_CONF_1_SIE;
965 mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v);
968 void mpic_irq_set_priority(unsigned int irq, unsigned int pri)
971 struct mpic *mpic = mpic_find(irq, &is_ipi);
972 unsigned int src = mpic_irq_to_hw(irq);
976 spin_lock_irqsave(&mpic_lock, flags);
978 reg = mpic_ipi_read(src - MPIC_VEC_IPI_0) &
979 ~MPIC_VECPRI_PRIORITY_MASK;
980 mpic_ipi_write(src - MPIC_VEC_IPI_0,
981 reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
983 reg = mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI)
984 & ~MPIC_VECPRI_PRIORITY_MASK;
985 mpic_irq_write(src, MPIC_IRQ_VECTOR_PRI,
986 reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT));
988 spin_unlock_irqrestore(&mpic_lock, flags);
991 unsigned int mpic_irq_get_priority(unsigned int irq)
994 struct mpic *mpic = mpic_find(irq, &is_ipi);
995 unsigned int src = mpic_irq_to_hw(irq);
999 spin_lock_irqsave(&mpic_lock, flags);
1001 reg = mpic_ipi_read(src = MPIC_VEC_IPI_0);
1003 reg = mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI);
1004 spin_unlock_irqrestore(&mpic_lock, flags);
1005 return (reg & MPIC_VECPRI_PRIORITY_MASK) >> MPIC_VECPRI_PRIORITY_SHIFT;
1008 void mpic_setup_this_cpu(void)
1011 struct mpic *mpic = mpic_primary;
1012 unsigned long flags;
1013 u32 msk = 1 << hard_smp_processor_id();
1016 BUG_ON(mpic == NULL);
1018 DBG("%s: setup_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
1020 spin_lock_irqsave(&mpic_lock, flags);
1022 /* let the mpic know we want intrs. default affinity is 0xffffffff
1023 * until changed via /proc. That's how it's done on x86. If we want
1024 * it differently, then we should make sure we also change the default
1025 * values of irq_desc[].affinity in irq.c.
1027 if (distribute_irqs) {
1028 for (i = 0; i < mpic->num_sources ; i++)
1029 mpic_irq_write(i, MPIC_IRQ_DESTINATION,
1030 mpic_irq_read(i, MPIC_IRQ_DESTINATION) | msk);
1033 /* Set current processor priority to 0 */
1034 mpic_cpu_write(MPIC_CPU_CURRENT_TASK_PRI, 0);
1036 spin_unlock_irqrestore(&mpic_lock, flags);
1037 #endif /* CONFIG_SMP */
1040 int mpic_cpu_get_priority(void)
1042 struct mpic *mpic = mpic_primary;
1044 return mpic_cpu_read(MPIC_CPU_CURRENT_TASK_PRI);
1047 void mpic_cpu_set_priority(int prio)
1049 struct mpic *mpic = mpic_primary;
1051 prio &= MPIC_CPU_TASKPRI_MASK;
1052 mpic_cpu_write(MPIC_CPU_CURRENT_TASK_PRI, prio);
1056 * XXX: someone who knows mpic should check this.
1057 * do we need to eoi the ipi including for kexec cpu here (see xics comments)?
1058 * or can we reset the mpic in the new kernel?
1060 void mpic_teardown_this_cpu(int secondary)
1062 struct mpic *mpic = mpic_primary;
1063 unsigned long flags;
1064 u32 msk = 1 << hard_smp_processor_id();
1067 BUG_ON(mpic == NULL);
1069 DBG("%s: teardown_this_cpu(%d)\n", mpic->name, hard_smp_processor_id());
1070 spin_lock_irqsave(&mpic_lock, flags);
1072 /* let the mpic know we don't want intrs. */
1073 for (i = 0; i < mpic->num_sources ; i++)
1074 mpic_irq_write(i, MPIC_IRQ_DESTINATION,
1075 mpic_irq_read(i, MPIC_IRQ_DESTINATION) & ~msk);
1077 /* Set current processor priority to max */
1078 mpic_cpu_write(MPIC_CPU_CURRENT_TASK_PRI, 0xf);
1080 spin_unlock_irqrestore(&mpic_lock, flags);
1084 void mpic_send_ipi(unsigned int ipi_no, unsigned int cpu_mask)
1086 struct mpic *mpic = mpic_primary;
1088 BUG_ON(mpic == NULL);
1091 DBG("%s: send_ipi(ipi_no: %d)\n", mpic->name, ipi_no);
1094 mpic_cpu_write(MPIC_CPU_IPI_DISPATCH_0 + ipi_no * 0x10,
1095 mpic_physmask(cpu_mask & cpus_addr(cpu_online_map)[0]));
1098 unsigned int mpic_get_one_irq(struct mpic *mpic, struct pt_regs *regs)
1102 src = mpic_cpu_read(MPIC_CPU_INTACK) & MPIC_VECPRI_VECTOR_MASK;
1104 DBG("%s: get_one_irq(): %d\n", mpic->name, src);
1106 if (unlikely(src == MPIC_VEC_SPURRIOUS))
1108 return irq_linear_revmap(mpic->irqhost, src);
1111 unsigned int mpic_get_irq(struct pt_regs *regs)
1113 struct mpic *mpic = mpic_primary;
1115 BUG_ON(mpic == NULL);
1117 return mpic_get_one_irq(mpic, regs);
1122 void mpic_request_ipis(void)
1124 struct mpic *mpic = mpic_primary;
1126 static char *ipi_names[] = {
1127 "IPI0 (call function)",
1128 "IPI1 (reschedule)",
1130 "IPI3 (debugger break)",
1132 BUG_ON(mpic == NULL);
1134 printk(KERN_INFO "mpic: requesting IPIs ... \n");
1136 for (i = 0; i < 4; i++) {
1137 unsigned int vipi = irq_create_mapping(mpic->irqhost,
1138 MPIC_VEC_IPI_0 + i, 0);
1139 if (vipi == NO_IRQ) {
1140 printk(KERN_ERR "Failed to map IPI %d\n", i);
1143 request_irq(vipi, mpic_ipi_action, IRQF_DISABLED,
1144 ipi_names[i], mpic);
1148 void smp_mpic_message_pass(int target, int msg)
1150 /* make sure we're sending something that translates to an IPI */
1151 if ((unsigned int)msg > 3) {
1152 printk("SMP %d: smp_message_pass: unknown msg %d\n",
1153 smp_processor_id(), msg);
1158 mpic_send_ipi(msg, 0xffffffff);
1160 case MSG_ALL_BUT_SELF:
1161 mpic_send_ipi(msg, 0xffffffff & ~(1 << smp_processor_id()));
1164 mpic_send_ipi(msg, 1 << target);
1168 #endif /* CONFIG_SMP */