/* * arch/powerpc/kernel/mpic.c * * Driver for interrupt controllers following the OpenPIC standard, the * common implementation beeing IBM's MPIC. This driver also can deal * with various broken implementations of this HW. * * Copyright (C) 2004 Benjamin Herrenschmidt, IBM Corp. * * This file is subject to the terms and conditions of the GNU General Public * License. See the file COPYING in the main directory of this archive * for more details. */ #undef DEBUG #undef DEBUG_IPI #undef DEBUG_IRQ #undef DEBUG_LOW #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef DEBUG #define DBG(fmt...) printk(fmt) #else #define DBG(fmt...) #endif static struct mpic *mpics; static struct mpic *mpic_primary; static DEFINE_SPINLOCK(mpic_lock); #ifdef CONFIG_PPC32 /* XXX for now */ #ifdef CONFIG_IRQ_ALL_CPUS #define distribute_irqs (1) #else #define distribute_irqs (0) #endif #endif /* * Register accessor functions */ static inline u32 _mpic_read(unsigned int be, volatile u32 __iomem *base, unsigned int reg) { if (be) return in_be32(base + (reg >> 2)); else return in_le32(base + (reg >> 2)); } static inline void _mpic_write(unsigned int be, volatile u32 __iomem *base, unsigned int reg, u32 value) { if (be) out_be32(base + (reg >> 2), value); else out_le32(base + (reg >> 2), value); } static inline u32 _mpic_ipi_read(struct mpic *mpic, unsigned int ipi) { unsigned int be = (mpic->flags & MPIC_BIG_ENDIAN) != 0; unsigned int offset = MPIC_GREG_IPI_VECTOR_PRI_0 + (ipi * 0x10); if (mpic->flags & MPIC_BROKEN_IPI) be = !be; return _mpic_read(be, mpic->gregs, offset); } static inline void _mpic_ipi_write(struct mpic *mpic, unsigned int ipi, u32 value) { unsigned int offset = MPIC_GREG_IPI_VECTOR_PRI_0 + (ipi * 0x10); _mpic_write(mpic->flags & MPIC_BIG_ENDIAN, mpic->gregs, offset, value); } static inline u32 _mpic_cpu_read(struct mpic *mpic, unsigned int reg) { unsigned int cpu = 0; if (mpic->flags & MPIC_PRIMARY) cpu = hard_smp_processor_id(); return _mpic_read(mpic->flags & MPIC_BIG_ENDIAN, mpic->cpuregs[cpu], reg); } static inline void _mpic_cpu_write(struct mpic *mpic, unsigned int reg, u32 value) { unsigned int cpu = 0; if (mpic->flags & MPIC_PRIMARY) cpu = hard_smp_processor_id(); _mpic_write(mpic->flags & MPIC_BIG_ENDIAN, mpic->cpuregs[cpu], reg, value); } static inline u32 _mpic_irq_read(struct mpic *mpic, unsigned int src_no, unsigned int reg) { unsigned int isu = src_no >> mpic->isu_shift; unsigned int idx = src_no & mpic->isu_mask; return _mpic_read(mpic->flags & MPIC_BIG_ENDIAN, mpic->isus[isu], reg + (idx * MPIC_IRQ_STRIDE)); } static inline void _mpic_irq_write(struct mpic *mpic, unsigned int src_no, unsigned int reg, u32 value) { unsigned int isu = src_no >> mpic->isu_shift; unsigned int idx = src_no & mpic->isu_mask; _mpic_write(mpic->flags & MPIC_BIG_ENDIAN, mpic->isus[isu], reg + (idx * MPIC_IRQ_STRIDE), value); } #define mpic_read(b,r) _mpic_read(mpic->flags & MPIC_BIG_ENDIAN,(b),(r)) #define mpic_write(b,r,v) _mpic_write(mpic->flags & MPIC_BIG_ENDIAN,(b),(r),(v)) #define mpic_ipi_read(i) _mpic_ipi_read(mpic,(i)) #define mpic_ipi_write(i,v) _mpic_ipi_write(mpic,(i),(v)) #define mpic_cpu_read(i) _mpic_cpu_read(mpic,(i)) #define mpic_cpu_write(i,v) _mpic_cpu_write(mpic,(i),(v)) #define mpic_irq_read(s,r) _mpic_irq_read(mpic,(s),(r)) #define mpic_irq_write(s,r,v) _mpic_irq_write(mpic,(s),(r),(v)) /* * Low level utility functions */ /* Check if we have one of those nice broken MPICs with a flipped endian on * reads from IPI registers */ static void __init mpic_test_broken_ipi(struct mpic *mpic) { u32 r; mpic_write(mpic->gregs, MPIC_GREG_IPI_VECTOR_PRI_0, MPIC_VECPRI_MASK); r = mpic_read(mpic->gregs, MPIC_GREG_IPI_VECTOR_PRI_0); if (r == le32_to_cpu(MPIC_VECPRI_MASK)) { printk(KERN_INFO "mpic: Detected reversed IPI registers\n"); mpic->flags |= MPIC_BROKEN_IPI; } } #ifdef CONFIG_MPIC_BROKEN_U3 /* Test if an interrupt is sourced from HyperTransport (used on broken U3s) * to force the edge setting on the MPIC and do the ack workaround. */ static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source) { if (source >= 128 || !mpic->fixups) return 0; return mpic->fixups[source].base != NULL; } static inline void mpic_ht_end_irq(struct mpic *mpic, unsigned int source) { struct mpic_irq_fixup *fixup = &mpic->fixups[source]; if (fixup->applebase) { unsigned int soff = (fixup->index >> 3) & ~3; unsigned int mask = 1U << (fixup->index & 0x1f); writel(mask, fixup->applebase + soff); } else { spin_lock(&mpic->fixup_lock); writeb(0x11 + 2 * fixup->index, fixup->base + 2); writel(fixup->data, fixup->base + 4); spin_unlock(&mpic->fixup_lock); } } static void mpic_startup_ht_interrupt(struct mpic *mpic, unsigned int source, unsigned int irqflags) { struct mpic_irq_fixup *fixup = &mpic->fixups[source]; unsigned long flags; u32 tmp; if (fixup->base == NULL) return; DBG("startup_ht_interrupt(%u, %u) index: %d\n", source, irqflags, fixup->index); spin_lock_irqsave(&mpic->fixup_lock, flags); /* Enable and configure */ writeb(0x10 + 2 * fixup->index, fixup->base + 2); tmp = readl(fixup->base + 4); tmp &= ~(0x23U); if (irqflags & IRQ_LEVEL) tmp |= 0x22; writel(tmp, fixup->base + 4); spin_unlock_irqrestore(&mpic->fixup_lock, flags); } static void mpic_shutdown_ht_interrupt(struct mpic *mpic, unsigned int source, unsigned int irqflags) { struct mpic_irq_fixup *fixup = &mpic->fixups[source]; unsigned long flags; u32 tmp; if (fixup->base == NULL) return; DBG("shutdown_ht_interrupt(%u, %u)\n", source, irqflags); /* Disable */ spin_lock_irqsave(&mpic->fixup_lock, flags); writeb(0x10 + 2 * fixup->index, fixup->base + 2); tmp = readl(fixup->base + 4); tmp |= 1; writel(tmp, fixup->base + 4); spin_unlock_irqrestore(&mpic->fixup_lock, flags); } static void __init mpic_scan_ht_pic(struct mpic *mpic, u8 __iomem *devbase, unsigned int devfn, u32 vdid) { int i, irq, n; u8 __iomem *base; u32 tmp; u8 pos; for (pos = readb(devbase + PCI_CAPABILITY_LIST); pos != 0; pos = readb(devbase + pos + PCI_CAP_LIST_NEXT)) { u8 id = readb(devbase + pos + PCI_CAP_LIST_ID); if (id == PCI_CAP_ID_HT_IRQCONF) { id = readb(devbase + pos + 3); if (id == 0x80) break; } } if (pos == 0) return; base = devbase + pos; writeb(0x01, base + 2); n = (readl(base + 4) >> 16) & 0xff; printk(KERN_INFO "mpic: - HT:%02x.%x [0x%02x] vendor %04x device %04x" " has %d irqs\n", devfn >> 3, devfn & 0x7, pos, vdid & 0xffff, vdid >> 16, n + 1); for (i = 0; i <= n; i++) { writeb(0x10 + 2 * i, base + 2); tmp = readl(base + 4); irq = (tmp >> 16) & 0xff; DBG("HT PIC index 0x%x, irq 0x%x, tmp: %08x\n", i, irq, tmp); /* mask it , will be unmasked later */ tmp |= 0x1; writel(tmp, base + 4); mpic->fixups[irq].index = i; mpic->fixups[irq].base = base; /* Apple HT PIC has a non-standard way of doing EOIs */ if ((vdid & 0xffff) == 0x106b) mpic->fixups[irq].applebase = devbase + 0x60; else mpic->fixups[irq].applebase = NULL; writeb(0x11 + 2 * i, base + 2); mpic->fixups[irq].data = readl(base + 4) | 0x80000000; } } static void __init mpic_scan_ht_pics(struct mpic *mpic) { unsigned int devfn; u8 __iomem *cfgspace; printk(KERN_INFO "mpic: Setting up HT PICs workarounds for U3/U4\n"); /* Allocate fixups array */ mpic->fixups = alloc_bootmem(128 * sizeof(struct mpic_irq_fixup)); BUG_ON(mpic->fixups == NULL); memset(mpic->fixups, 0, 128 * sizeof(struct mpic_irq_fixup)); /* Init spinlock */ spin_lock_init(&mpic->fixup_lock); /* Map U3 config space. We assume all IO-APICs are on the primary bus * so we only need to map 64kB. */ cfgspace = ioremap(0xf2000000, 0x10000); BUG_ON(cfgspace == NULL); /* Now we scan all slots. We do a very quick scan, we read the header * type, vendor ID and device ID only, that's plenty enough */ for (devfn = 0; devfn < 0x100; devfn++) { u8 __iomem *devbase = cfgspace + (devfn << 8); u8 hdr_type = readb(devbase + PCI_HEADER_TYPE); u32 l = readl(devbase + PCI_VENDOR_ID); u16 s; DBG("devfn %x, l: %x\n", devfn, l); /* If no device, skip */ if (l == 0xffffffff || l == 0x00000000 || l == 0x0000ffff || l == 0xffff0000) goto next; /* Check if is supports capability lists */ s = readw(devbase + PCI_STATUS); if (!(s & PCI_STATUS_CAP_LIST)) goto next; mpic_scan_ht_pic(mpic, devbase, devfn, l); next: /* next device, if function 0 */ if (PCI_FUNC(devfn) == 0 && (hdr_type & 0x80) == 0) devfn += 7; } } #else /* CONFIG_MPIC_BROKEN_U3 */ static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source) { return 0; } static void __init mpic_scan_ht_pics(struct mpic *mpic) { } #endif /* CONFIG_MPIC_BROKEN_U3 */ #define mpic_irq_to_hw(virq) ((unsigned int)irq_map[virq].hwirq) /* Find an mpic associated with a given linux interrupt */ static struct mpic *mpic_find(unsigned int irq, unsigned int *is_ipi) { unsigned int src = mpic_irq_to_hw(irq); if (irq < NUM_ISA_INTERRUPTS) return NULL; if (is_ipi) *is_ipi = (src >= MPIC_VEC_IPI_0 && src <= MPIC_VEC_IPI_3); return irq_desc[irq].chip_data; } /* Convert a cpu mask from logical to physical cpu numbers. */ static inline u32 mpic_physmask(u32 cpumask) { int i; u32 mask = 0; for (i = 0; i < NR_CPUS; ++i, cpumask >>= 1) mask |= (cpumask & 1) << get_hard_smp_processor_id(i); return mask; } #ifdef CONFIG_SMP /* Get the mpic structure from the IPI number */ static inline struct mpic * mpic_from_ipi(unsigned int ipi) { return irq_desc[ipi].chip_data; } #endif /* Get the mpic structure from the irq number */ static inline struct mpic * mpic_from_irq(unsigned int irq) { return irq_desc[irq].chip_data; } /* Send an EOI */ static inline void mpic_eoi(struct mpic *mpic) { mpic_cpu_write(MPIC_CPU_EOI, 0); (void)mpic_cpu_read(MPIC_CPU_WHOAMI); } #ifdef CONFIG_SMP static irqreturn_t mpic_ipi_action(int irq, void *dev_id, struct pt_regs *regs) { smp_message_recv(mpic_irq_to_hw(irq) - MPIC_VEC_IPI_0, regs); return IRQ_HANDLED; } #endif /* CONFIG_SMP */ /* * Linux descriptor level callbacks */ static void mpic_unmask_irq(unsigned int irq) { unsigned int loops = 100000; struct mpic *mpic = mpic_from_irq(irq); unsigned int src = mpic_irq_to_hw(irq); DBG("%p: %s: enable_irq: %d (src %d)\n", mpic, mpic->name, irq, src); mpic_irq_write(src, MPIC_IRQ_VECTOR_PRI, mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI) & ~MPIC_VECPRI_MASK); /* make sure mask gets to controller before we return to user */ do { if (!loops--) { printk(KERN_ERR "mpic_enable_irq timeout\n"); break; } } while(mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI) & MPIC_VECPRI_MASK); } static void mpic_mask_irq(unsigned int irq) { unsigned int loops = 100000; struct mpic *mpic = mpic_from_irq(irq); unsigned int src = mpic_irq_to_hw(irq); DBG("%s: disable_irq: %d (src %d)\n", mpic->name, irq, src); mpic_irq_write(src, MPIC_IRQ_VECTOR_PRI, mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI) | MPIC_VECPRI_MASK); /* make sure mask gets to controller before we return to user */ do { if (!loops--) { printk(KERN_ERR "mpic_enable_irq timeout\n"); break; } } while(!(mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI) & MPIC_VECPRI_MASK)); } static void mpic_end_irq(unsigned int irq) { struct mpic *mpic = mpic_from_irq(irq); #ifdef DEBUG_IRQ DBG("%s: end_irq: %d\n", mpic->name, irq); #endif /* We always EOI on end_irq() even for edge interrupts since that * should only lower the priority, the MPIC should have properly * latched another edge interrupt coming in anyway */ mpic_eoi(mpic); } #ifdef CONFIG_MPIC_BROKEN_U3 static void mpic_unmask_ht_irq(unsigned int irq) { struct mpic *mpic = mpic_from_irq(irq); unsigned int src = mpic_irq_to_hw(irq); mpic_unmask_irq(irq); if (irq_desc[irq].status & IRQ_LEVEL) mpic_ht_end_irq(mpic, src); } static unsigned int mpic_startup_ht_irq(unsigned int irq) { struct mpic *mpic = mpic_from_irq(irq); unsigned int src = mpic_irq_to_hw(irq); mpic_unmask_irq(irq); mpic_startup_ht_interrupt(mpic, src, irq_desc[irq].status); return 0; } static void mpic_shutdown_ht_irq(unsigned int irq) { struct mpic *mpic = mpic_from_irq(irq); unsigned int src = mpic_irq_to_hw(irq); mpic_shutdown_ht_interrupt(mpic, src, irq_desc[irq].status); mpic_mask_irq(irq); } static void mpic_end_ht_irq(unsigned int irq) { struct mpic *mpic = mpic_from_irq(irq); unsigned int src = mpic_irq_to_hw(irq); #ifdef DEBUG_IRQ DBG("%s: end_irq: %d\n", mpic->name, irq); #endif /* We always EOI on end_irq() even for edge interrupts since that * should only lower the priority, the MPIC should have properly * latched another edge interrupt coming in anyway */ if (irq_desc[irq].status & IRQ_LEVEL) mpic_ht_end_irq(mpic, src); mpic_eoi(mpic); } #endif /* !CONFIG_MPIC_BROKEN_U3 */ #ifdef CONFIG_SMP static void mpic_unmask_ipi(unsigned int irq) { struct mpic *mpic = mpic_from_ipi(irq); unsigned int src = mpic_irq_to_hw(irq) - MPIC_VEC_IPI_0; DBG("%s: enable_ipi: %d (ipi %d)\n", mpic->name, irq, src); mpic_ipi_write(src, mpic_ipi_read(src) & ~MPIC_VECPRI_MASK); } static void mpic_mask_ipi(unsigned int irq) { /* NEVER disable an IPI... that's just plain wrong! */ } static void mpic_end_ipi(unsigned int irq) { struct mpic *mpic = mpic_from_ipi(irq); /* * IPIs are marked IRQ_PER_CPU. This has the side effect of * preventing the IRQ_PENDING/IRQ_INPROGRESS logic from * applying to them. We EOI them late to avoid re-entering. * We mark IPI's with IRQF_DISABLED as they must run with * irqs disabled. */ mpic_eoi(mpic); } #endif /* CONFIG_SMP */ static void mpic_set_affinity(unsigned int irq, cpumask_t cpumask) { struct mpic *mpic = mpic_from_irq(irq); unsigned int src = mpic_irq_to_hw(irq); cpumask_t tmp; cpus_and(tmp, cpumask, cpu_online_map); mpic_irq_write(src, MPIC_IRQ_DESTINATION, mpic_physmask(cpus_addr(tmp)[0])); } static unsigned int mpic_type_to_vecpri(unsigned int type) { /* Now convert sense value */ switch(type & IRQ_TYPE_SENSE_MASK) { case IRQ_TYPE_EDGE_RISING: return MPIC_VECPRI_SENSE_EDGE | MPIC_VECPRI_POLARITY_POSITIVE; case IRQ_TYPE_EDGE_FALLING: case IRQ_TYPE_EDGE_BOTH: return MPIC_VECPRI_SENSE_EDGE | MPIC_VECPRI_POLARITY_NEGATIVE; case IRQ_TYPE_LEVEL_HIGH: return MPIC_VECPRI_SENSE_LEVEL | MPIC_VECPRI_POLARITY_POSITIVE; case IRQ_TYPE_LEVEL_LOW: default: return MPIC_VECPRI_SENSE_LEVEL | MPIC_VECPRI_POLARITY_NEGATIVE; } } static int mpic_set_irq_type(unsigned int virq, unsigned int flow_type) { struct mpic *mpic = mpic_from_irq(virq); unsigned int src = mpic_irq_to_hw(virq); struct irq_desc *desc = get_irq_desc(virq); unsigned int vecpri, vold, vnew; pr_debug("mpic: set_irq_type(mpic:@%p,virq:%d,src:%d,type:0x%x)\n", mpic, virq, src, flow_type); if (src >= mpic->irq_count) return -EINVAL; if (flow_type == IRQ_TYPE_NONE) if (mpic->senses && src < mpic->senses_count) flow_type = mpic->senses[src]; if (flow_type == IRQ_TYPE_NONE) flow_type = IRQ_TYPE_LEVEL_LOW; desc->status &= ~(IRQ_TYPE_SENSE_MASK | IRQ_LEVEL); desc->status |= flow_type & IRQ_TYPE_SENSE_MASK; if (flow_type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW)) desc->status |= IRQ_LEVEL; if (mpic_is_ht_interrupt(mpic, src)) vecpri = MPIC_VECPRI_POLARITY_POSITIVE | MPIC_VECPRI_SENSE_EDGE; else vecpri = mpic_type_to_vecpri(flow_type); vold = mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI); vnew = vold & ~(MPIC_VECPRI_POLARITY_MASK | MPIC_VECPRI_SENSE_MASK); vnew |= vecpri; if (vold != vnew) mpic_irq_write(src, MPIC_IRQ_VECTOR_PRI, vnew); return 0; } static struct irq_chip mpic_irq_chip = { .mask = mpic_mask_irq, .unmask = mpic_unmask_irq, .eoi = mpic_end_irq, .set_type = mpic_set_irq_type, }; #ifdef CONFIG_SMP static struct irq_chip mpic_ipi_chip = { .mask = mpic_mask_ipi, .unmask = mpic_unmask_ipi, .eoi = mpic_end_ipi, }; #endif /* CONFIG_SMP */ #ifdef CONFIG_MPIC_BROKEN_U3 static struct irq_chip mpic_irq_ht_chip = { .startup = mpic_startup_ht_irq, .shutdown = mpic_shutdown_ht_irq, .mask = mpic_mask_irq, .unmask = mpic_unmask_ht_irq, .eoi = mpic_end_ht_irq, .set_type = mpic_set_irq_type, }; #endif /* CONFIG_MPIC_BROKEN_U3 */ static int mpic_host_match(struct irq_host *h, struct device_node *node) { struct mpic *mpic = h->host_data; /* Exact match, unless mpic node is NULL */ return mpic->of_node == NULL || mpic->of_node == node; } static int mpic_host_map(struct irq_host *h, unsigned int virq, irq_hw_number_t hw) { struct mpic *mpic = h->host_data; struct irq_chip *chip; pr_debug("mpic: map virq %d, hwirq 0x%lx\n", virq, hw); if (hw == MPIC_VEC_SPURRIOUS) return -EINVAL; #ifdef CONFIG_SMP else if (hw >= MPIC_VEC_IPI_0) { WARN_ON(!(mpic->flags & MPIC_PRIMARY)); pr_debug("mpic: mapping as IPI\n"); set_irq_chip_data(virq, mpic); set_irq_chip_and_handler(virq, &mpic->hc_ipi, handle_percpu_irq); return 0; } #endif /* CONFIG_SMP */ if (hw >= mpic->irq_count) return -EINVAL; /* Default chip */ chip = &mpic->hc_irq; #ifdef CONFIG_MPIC_BROKEN_U3 /* Check for HT interrupts, override vecpri */ if (mpic_is_ht_interrupt(mpic, hw)) chip = &mpic->hc_ht_irq; #endif /* CONFIG_MPIC_BROKEN_U3 */ pr_debug("mpic: mapping to irq chip @%p\n", chip); set_irq_chip_data(virq, mpic); set_irq_chip_and_handler(virq, chip, handle_fasteoi_irq); /* Set default irq type */ set_irq_type(virq, IRQ_TYPE_NONE); return 0; } static int mpic_host_xlate(struct irq_host *h, struct device_node *ct, u32 *intspec, unsigned int intsize, irq_hw_number_t *out_hwirq, unsigned int *out_flags) { static unsigned char map_mpic_senses[4] = { IRQ_TYPE_EDGE_RISING, IRQ_TYPE_LEVEL_LOW, IRQ_TYPE_LEVEL_HIGH, IRQ_TYPE_EDGE_FALLING, }; *out_hwirq = intspec[0]; if (intsize > 1 && intspec[1] < 4) *out_flags = map_mpic_senses[intspec[1]]; else *out_flags = IRQ_TYPE_NONE; return 0; } static struct irq_host_ops mpic_host_ops = { .match = mpic_host_match, .map = mpic_host_map, .xlate = mpic_host_xlate, }; /* * Exported functions */ struct mpic * __init mpic_alloc(struct device_node *node, unsigned long phys_addr, unsigned int flags, unsigned int isu_size, unsigned int irq_count, const char *name) { struct mpic *mpic; u32 reg; const char *vers; int i; mpic = alloc_bootmem(sizeof(struct mpic)); if (mpic == NULL) return NULL; memset(mpic, 0, sizeof(struct mpic)); mpic->name = name; mpic->of_node = node ? of_node_get(node) : NULL; mpic->irqhost = irq_alloc_host(IRQ_HOST_MAP_LINEAR, 256, &mpic_host_ops, MPIC_VEC_SPURRIOUS); if (mpic->irqhost == NULL) { of_node_put(node); return NULL; } mpic->irqhost->host_data = mpic; mpic->hc_irq = mpic_irq_chip; mpic->hc_irq.typename = name; if (flags & MPIC_PRIMARY) mpic->hc_irq.set_affinity = mpic_set_affinity; #ifdef CONFIG_MPIC_BROKEN_U3 mpic->hc_ht_irq = mpic_irq_ht_chip; mpic->hc_ht_irq.typename = name; if (flags & MPIC_PRIMARY) mpic->hc_ht_irq.set_affinity = mpic_set_affinity; #endif /* CONFIG_MPIC_BROKEN_U3 */ #ifdef CONFIG_SMP mpic->hc_ipi = mpic_ipi_chip; mpic->hc_ipi.typename = name; #endif /* CONFIG_SMP */ mpic->flags = flags; mpic->isu_size = isu_size; mpic->irq_count = irq_count; mpic->num_sources = 0; /* so far */ /* Map the global registers */ mpic->gregs = ioremap(phys_addr + MPIC_GREG_BASE, 0x1000); mpic->tmregs = mpic->gregs + ((MPIC_TIMER_BASE - MPIC_GREG_BASE) >> 2); BUG_ON(mpic->gregs == NULL); /* Reset */ if (flags & MPIC_WANTS_RESET) { mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_0, mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_0) | MPIC_GREG_GCONF_RESET); while( mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_0) & MPIC_GREG_GCONF_RESET) mb(); } /* Read feature register, calculate num CPUs and, for non-ISU * MPICs, num sources as well. On ISU MPICs, sources are counted * as ISUs are added */ reg = mpic_read(mpic->gregs, MPIC_GREG_FEATURE_0); mpic->num_cpus = ((reg & MPIC_GREG_FEATURE_LAST_CPU_MASK) >> MPIC_GREG_FEATURE_LAST_CPU_SHIFT) + 1; if (isu_size == 0) mpic->num_sources = ((reg & MPIC_GREG_FEATURE_LAST_SRC_MASK) >> MPIC_GREG_FEATURE_LAST_SRC_SHIFT) + 1; /* Map the per-CPU registers */ for (i = 0; i < mpic->num_cpus; i++) { mpic->cpuregs[i] = ioremap(phys_addr + MPIC_CPU_BASE + i * MPIC_CPU_STRIDE, 0x1000); BUG_ON(mpic->cpuregs[i] == NULL); } /* Initialize main ISU if none provided */ if (mpic->isu_size == 0) { mpic->isu_size = mpic->num_sources; mpic->isus[0] = ioremap(phys_addr + MPIC_IRQ_BASE, MPIC_IRQ_STRIDE * mpic->isu_size); BUG_ON(mpic->isus[0] == NULL); } mpic->isu_shift = 1 + __ilog2(mpic->isu_size - 1); mpic->isu_mask = (1 << mpic->isu_shift) - 1; /* Display version */ switch (reg & MPIC_GREG_FEATURE_VERSION_MASK) { case 1: vers = "1.0"; break; case 2: vers = "1.2"; break; case 3: vers = "1.3"; break; default: vers = ""; break; } printk(KERN_INFO "mpic: Setting up MPIC \"%s\" version %s at %lx, max %d CPUs\n", name, vers, phys_addr, mpic->num_cpus); printk(KERN_INFO "mpic: ISU size: %d, shift: %d, mask: %x\n", mpic->isu_size, mpic->isu_shift, mpic->isu_mask); mpic->next = mpics; mpics = mpic; if (flags & MPIC_PRIMARY) { mpic_primary = mpic; irq_set_default_host(mpic->irqhost); } return mpic; } void __init mpic_assign_isu(struct mpic *mpic, unsigned int isu_num, unsigned long phys_addr) { unsigned int isu_first = isu_num * mpic->isu_size; BUG_ON(isu_num >= MPIC_MAX_ISU); mpic->isus[isu_num] = ioremap(phys_addr, MPIC_IRQ_STRIDE * mpic->isu_size); if ((isu_first + mpic->isu_size) > mpic->num_sources) mpic->num_sources = isu_first + mpic->isu_size; } void __init mpic_set_default_senses(struct mpic *mpic, u8 *senses, int count) { mpic->senses = senses; mpic->senses_count = count; } void __init mpic_init(struct mpic *mpic) { int i; BUG_ON(mpic->num_sources == 0); WARN_ON(mpic->num_sources > MPIC_VEC_IPI_0); /* Sanitize source count */ if (mpic->num_sources > MPIC_VEC_IPI_0) mpic->num_sources = MPIC_VEC_IPI_0; printk(KERN_INFO "mpic: Initializing for %d sources\n", mpic->num_sources); /* Set current processor priority to max */ mpic_cpu_write(MPIC_CPU_CURRENT_TASK_PRI, 0xf); /* Initialize timers: just disable them all */ for (i = 0; i < 4; i++) { mpic_write(mpic->tmregs, i * MPIC_TIMER_STRIDE + MPIC_TIMER_DESTINATION, 0); mpic_write(mpic->tmregs, i * MPIC_TIMER_STRIDE + MPIC_TIMER_VECTOR_PRI, MPIC_VECPRI_MASK | (MPIC_VEC_TIMER_0 + i)); } /* Initialize IPIs to our reserved vectors and mark them disabled for now */ mpic_test_broken_ipi(mpic); for (i = 0; i < 4; i++) { mpic_ipi_write(i, MPIC_VECPRI_MASK | (10 << MPIC_VECPRI_PRIORITY_SHIFT) | (MPIC_VEC_IPI_0 + i)); } /* Initialize interrupt sources */ if (mpic->irq_count == 0) mpic->irq_count = mpic->num_sources; /* Do the HT PIC fixups on U3 broken mpic */ DBG("MPIC flags: %x\n", mpic->flags); if ((mpic->flags & MPIC_BROKEN_U3) && (mpic->flags & MPIC_PRIMARY)) mpic_scan_ht_pics(mpic); for (i = 0; i < mpic->num_sources; i++) { /* start with vector = source number, and masked */ u32 vecpri = MPIC_VECPRI_MASK | i | (8 << MPIC_VECPRI_PRIORITY_SHIFT); /* init hw */ mpic_irq_write(i, MPIC_IRQ_VECTOR_PRI, vecpri); mpic_irq_write(i, MPIC_IRQ_DESTINATION, 1 << hard_smp_processor_id()); } /* Init spurrious vector */ mpic_write(mpic->gregs, MPIC_GREG_SPURIOUS, MPIC_VEC_SPURRIOUS); /* Disable 8259 passthrough */ mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_0, mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_0) | MPIC_GREG_GCONF_8259_PTHROU_DIS); /* Set current processor priority to 0 */ mpic_cpu_write(MPIC_CPU_CURRENT_TASK_PRI, 0); } void __init mpic_set_clk_ratio(struct mpic *mpic, u32 clock_ratio) { u32 v; v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1); v &= ~MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO_MASK; v |= MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO(clock_ratio); mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v); } void __init mpic_set_serial_int(struct mpic *mpic, int enable) { unsigned long flags; u32 v; spin_lock_irqsave(&mpic_lock, flags); v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1); if (enable) v |= MPIC_GREG_GLOBAL_CONF_1_SIE; else v &= ~MPIC_GREG_GLOBAL_CONF_1_SIE; mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v); spin_unlock_irqrestore(&mpic_lock, flags); } void mpic_irq_set_priority(unsigned int irq, unsigned int pri) { int is_ipi; struct mpic *mpic = mpic_find(irq, &is_ipi); unsigned int src = mpic_irq_to_hw(irq); unsigned long flags; u32 reg; spin_lock_irqsave(&mpic_lock, flags); if (is_ipi) { reg = mpic_ipi_read(src - MPIC_VEC_IPI_0) & ~MPIC_VECPRI_PRIORITY_MASK; mpic_ipi_write(src - MPIC_VEC_IPI_0, reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT)); } else { reg = mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI) & ~MPIC_VECPRI_PRIORITY_MASK; mpic_irq_write(src, MPIC_IRQ_VECTOR_PRI, reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT)); } spin_unlock_irqrestore(&mpic_lock, flags); } unsigned int mpic_irq_get_priority(unsigned int irq) { int is_ipi; struct mpic *mpic = mpic_find(irq, &is_ipi); unsigned int src = mpic_irq_to_hw(irq); unsigned long flags; u32 reg; spin_lock_irqsave(&mpic_lock, flags); if (is_ipi) reg = mpic_ipi_read(src = MPIC_VEC_IPI_0); else reg = mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI); spin_unlock_irqrestore(&mpic_lock, flags); return (reg & MPIC_VECPRI_PRIORITY_MASK) >> MPIC_VECPRI_PRIORITY_SHIFT; } void mpic_setup_this_cpu(void) { #ifdef CONFIG_SMP struct mpic *mpic = mpic_primary; unsigned long flags; u32 msk = 1 << hard_smp_processor_id(); unsigned int i; BUG_ON(mpic == NULL); DBG("%s: setup_this_cpu(%d)\n", mpic->name, hard_smp_processor_id()); spin_lock_irqsave(&mpic_lock, flags); /* let the mpic know we want intrs. default affinity is 0xffffffff * until changed via /proc. That's how it's done on x86. If we want * it differently, then we should make sure we also change the default * values of irq_desc[].affinity in irq.c. */ if (distribute_irqs) { for (i = 0; i < mpic->num_sources ; i++) mpic_irq_write(i, MPIC_IRQ_DESTINATION, mpic_irq_read(i, MPIC_IRQ_DESTINATION) | msk); } /* Set current processor priority to 0 */ mpic_cpu_write(MPIC_CPU_CURRENT_TASK_PRI, 0); spin_unlock_irqrestore(&mpic_lock, flags); #endif /* CONFIG_SMP */ } int mpic_cpu_get_priority(void) { struct mpic *mpic = mpic_primary; return mpic_cpu_read(MPIC_CPU_CURRENT_TASK_PRI); } void mpic_cpu_set_priority(int prio) { struct mpic *mpic = mpic_primary; prio &= MPIC_CPU_TASKPRI_MASK; mpic_cpu_write(MPIC_CPU_CURRENT_TASK_PRI, prio); } /* * XXX: someone who knows mpic should check this. * do we need to eoi the ipi including for kexec cpu here (see xics comments)? * or can we reset the mpic in the new kernel? */ void mpic_teardown_this_cpu(int secondary) { struct mpic *mpic = mpic_primary; unsigned long flags; u32 msk = 1 << hard_smp_processor_id(); unsigned int i; BUG_ON(mpic == NULL); DBG("%s: teardown_this_cpu(%d)\n", mpic->name, hard_smp_processor_id()); spin_lock_irqsave(&mpic_lock, flags); /* let the mpic know we don't want intrs. */ for (i = 0; i < mpic->num_sources ; i++) mpic_irq_write(i, MPIC_IRQ_DESTINATION, mpic_irq_read(i, MPIC_IRQ_DESTINATION) & ~msk); /* Set current processor priority to max */ mpic_cpu_write(MPIC_CPU_CURRENT_TASK_PRI, 0xf); spin_unlock_irqrestore(&mpic_lock, flags); } void mpic_send_ipi(unsigned int ipi_no, unsigned int cpu_mask) { struct mpic *mpic = mpic_primary; BUG_ON(mpic == NULL); #ifdef DEBUG_IPI DBG("%s: send_ipi(ipi_no: %d)\n", mpic->name, ipi_no); #endif mpic_cpu_write(MPIC_CPU_IPI_DISPATCH_0 + ipi_no * 0x10, mpic_physmask(cpu_mask & cpus_addr(cpu_online_map)[0])); } unsigned int mpic_get_one_irq(struct mpic *mpic, struct pt_regs *regs) { u32 src; src = mpic_cpu_read(MPIC_CPU_INTACK) & MPIC_VECPRI_VECTOR_MASK; #ifdef DEBUG_LOW DBG("%s: get_one_irq(): %d\n", mpic->name, src); #endif if (unlikely(src == MPIC_VEC_SPURRIOUS)) return NO_IRQ; return irq_linear_revmap(mpic->irqhost, src); } unsigned int mpic_get_irq(struct pt_regs *regs) { struct mpic *mpic = mpic_primary; BUG_ON(mpic == NULL); return mpic_get_one_irq(mpic, regs); } #ifdef CONFIG_SMP void mpic_request_ipis(void) { struct mpic *mpic = mpic_primary; int i; static char *ipi_names[] = { "IPI0 (call function)", "IPI1 (reschedule)", "IPI2 (unused)", "IPI3 (debugger break)", }; BUG_ON(mpic == NULL); printk(KERN_INFO "mpic: requesting IPIs ... \n"); for (i = 0; i < 4; i++) { unsigned int vipi = irq_create_mapping(mpic->irqhost, MPIC_VEC_IPI_0 + i); if (vipi == NO_IRQ) { printk(KERN_ERR "Failed to map IPI %d\n", i); break; } request_irq(vipi, mpic_ipi_action, IRQF_DISABLED, ipi_names[i], mpic); } } void smp_mpic_message_pass(int target, int msg) { /* make sure we're sending something that translates to an IPI */ if ((unsigned int)msg > 3) { printk("SMP %d: smp_message_pass: unknown msg %d\n", smp_processor_id(), msg); return; } switch (target) { case MSG_ALL: mpic_send_ipi(msg, 0xffffffff); break; case MSG_ALL_BUT_SELF: mpic_send_ipi(msg, 0xffffffff & ~(1 << smp_processor_id())); break; default: mpic_send_ipi(msg, 1 << target); break; } } #endif /* CONFIG_SMP */