/* * 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 #include #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 */ #define distribute_irqs CONFIG_IRQ_ALL_CPUS #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_no) { if (source_no >= 128 || !mpic->fixups) return 0; return mpic->fixups[source_no].base != NULL; } static inline void mpic_apic_end_irq(struct mpic *mpic, unsigned int source_no) { struct mpic_irq_fixup *fixup = &mpic->fixups[source_no]; u32 tmp; spin_lock(&mpic->fixup_lock); writeb(0x11 + 2 * fixup->irq, fixup->base); tmp = readl(fixup->base + 2); writel(tmp | 0x80000000ul, fixup->base + 2); /* config writes shouldn't be posted but let's be safe ... */ (void)readl(fixup->base + 2); spin_unlock(&mpic->fixup_lock); } static void __init mpic_amd8111_read_irq(struct mpic *mpic, u8 __iomem *devbase) { int i, irq; u32 tmp; printk(KERN_INFO "mpic: - Workarounds on AMD 8111 @ %p\n", devbase); for (i=0; i < 24; i++) { writeb(0x10 + 2*i, devbase + 0xf2); tmp = readl(devbase + 0xf4); if ((tmp & 0x1) || !(tmp & 0x20)) continue; irq = (tmp >> 16) & 0xff; mpic->fixups[irq].irq = i; mpic->fixups[irq].base = devbase + 0xf2; } } static void __init mpic_amd8131_read_irq(struct mpic *mpic, u8 __iomem *devbase) { int i, irq; u32 tmp; printk(KERN_INFO "mpic: - Workarounds on AMD 8131 @ %p\n", devbase); for (i=0; i < 4; i++) { writeb(0x10 + 2*i, devbase + 0xba); tmp = readl(devbase + 0xbc); if ((tmp & 0x1) || !(tmp & 0x20)) continue; irq = (tmp >> 16) & 0xff; mpic->fixups[irq].irq = i; mpic->fixups[irq].base = devbase + 0xba; } } static void __init mpic_scan_ioapics(struct mpic *mpic) { unsigned int devfn; u8 __iomem *cfgspace; printk(KERN_INFO "mpic: Setting up IO-APICs workarounds for U3\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 * and slot will never be above "0xf" so we only need to map 32k */ cfgspace = (unsigned char __iomem *)ioremap(0xf2000000, 0x8000); 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 < PCI_DEVFN(0x10,0); devfn ++) { u8 __iomem *devbase = cfgspace + (devfn << 8); u8 hdr_type = readb(devbase + PCI_HEADER_TYPE); u32 l = readl(devbase + PCI_VENDOR_ID); u16 vendor_id, device_id; int multifunc = 0; 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 it's a multifunction device (only really used * to function 0 though */ multifunc = !!(hdr_type & 0x80); vendor_id = l & 0xffff; device_id = (l >> 16) & 0xffff; /* If a known device, go to fixup setup code */ if (vendor_id == PCI_VENDOR_ID_AMD && device_id == 0x7460) mpic_amd8111_read_irq(mpic, devbase); if (vendor_id == PCI_VENDOR_ID_AMD && device_id == 0x7450) mpic_amd8131_read_irq(mpic, devbase); next: /* next device, if function 0 */ if ((PCI_FUNC(devfn) == 0) && !multifunc) devfn += 7; } } #endif /* CONFIG_MPIC_BROKEN_U3 */ /* Find an mpic associated with a given linux interrupt */ static struct mpic *mpic_find(unsigned int irq, unsigned int *is_ipi) { struct mpic *mpic = mpics; while(mpic) { /* search IPIs first since they may override the main interrupts */ if (irq >= mpic->ipi_offset && irq < (mpic->ipi_offset + 4)) { if (is_ipi) *is_ipi = 1; return mpic; } if (irq >= mpic->irq_offset && irq < (mpic->irq_offset + mpic->irq_count)) { if (is_ipi) *is_ipi = 0; return mpic; } mpic = mpic -> next; } return NULL; } /* 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 container_of(irq_desc[ipi].handler, struct mpic, hc_ipi); } #endif /* Get the mpic structure from the irq number */ static inline struct mpic * mpic_from_irq(unsigned int irq) { return container_of(irq_desc[irq].handler, struct mpic, hc_irq); } /* 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) { struct mpic *mpic = dev_id; smp_message_recv(irq - mpic->ipi_offset, regs); return IRQ_HANDLED; } #endif /* CONFIG_SMP */ /* * Linux descriptor level callbacks */ static void mpic_enable_irq(unsigned int irq) { unsigned int loops = 100000; struct mpic *mpic = mpic_from_irq(irq); unsigned int src = irq - mpic->irq_offset; DBG("%s: enable_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_disable_irq(unsigned int irq) { unsigned int loops = 100000; struct mpic *mpic = mpic_from_irq(irq); unsigned int src = irq - mpic->irq_offset; 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); DBG("%s: end_irq: %d\n", mpic->name, irq); /* 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 */ #ifdef CONFIG_MPIC_BROKEN_U3 if (mpic->flags & MPIC_BROKEN_U3) { unsigned int src = irq - mpic->irq_offset; if (mpic_is_ht_interrupt(mpic, src)) mpic_apic_end_irq(mpic, src); } #endif /* CONFIG_MPIC_BROKEN_U3 */ mpic_eoi(mpic); } #ifdef CONFIG_SMP static void mpic_enable_ipi(unsigned int irq) { struct mpic *mpic = mpic_from_ipi(irq); unsigned int src = irq - mpic->ipi_offset; 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_disable_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 SA_INTERRUPT 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); cpumask_t tmp; cpus_and(tmp, cpumask, cpu_online_map); mpic_irq_write(irq - mpic->irq_offset, MPIC_IRQ_DESTINATION, mpic_physmask(cpus_addr(tmp)[0])); } /* * Exported functions */ struct mpic * __init mpic_alloc(unsigned long phys_addr, unsigned int flags, unsigned int isu_size, unsigned int irq_offset, unsigned int irq_count, unsigned int ipi_offset, unsigned char *senses, unsigned int senses_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->hc_irq.typename = name; mpic->hc_irq.enable = mpic_enable_irq; mpic->hc_irq.disable = mpic_disable_irq; mpic->hc_irq.end = mpic_end_irq; if (flags & MPIC_PRIMARY) mpic->hc_irq.set_affinity = mpic_set_affinity; #ifdef CONFIG_SMP mpic->hc_ipi.typename = name; mpic->hc_ipi.enable = mpic_enable_ipi; mpic->hc_ipi.disable = mpic_disable_ipi; mpic->hc_ipi.end = mpic_end_ipi; #endif /* CONFIG_SMP */ mpic->flags = flags; mpic->isu_size = isu_size; mpic->irq_offset = irq_offset; mpic->irq_count = irq_count; mpic->ipi_offset = ipi_offset; mpic->num_sources = 0; /* so far */ mpic->senses = senses; mpic->senses_count = senses_count; /* Map the global registers */ mpic->gregs = ioremap(phys_addr + MPIC_GREG_BASE, 0x1000); mpic->tmregs = mpic->gregs + (MPIC_TIMER_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; 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_setup_cascade(unsigned int irq, mpic_cascade_t handler, void *data) { struct mpic *mpic = mpic_find(irq, NULL); unsigned long flags; /* Synchronization here is a bit dodgy, so don't try to replace cascade * interrupts on the fly too often ... but normally it's set up at boot. */ spin_lock_irqsave(&mpic_lock, flags); if (mpic->cascade) mpic_disable_irq(mpic->cascade_vec + mpic->irq_offset); mpic->cascade = NULL; wmb(); mpic->cascade_vec = irq - mpic->irq_offset; mpic->cascade_data = data; wmb(); mpic->cascade = handler; mpic_enable_irq(irq); spin_unlock_irqrestore(&mpic_lock, flags); } void __init mpic_init(struct mpic *mpic) { int i; BUG_ON(mpic->num_sources == 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)); #ifdef CONFIG_SMP if (!(mpic->flags & MPIC_PRIMARY)) continue; irq_desc[mpic->ipi_offset+i].status |= IRQ_PER_CPU; irq_desc[mpic->ipi_offset+i].handler = &mpic->hc_ipi; #endif /* CONFIG_SMP */ } /* Initialize interrupt sources */ if (mpic->irq_count == 0) mpic->irq_count = mpic->num_sources; #ifdef CONFIG_MPIC_BROKEN_U3 /* Do the ioapic fixups on U3 broken mpic */ DBG("MPIC flags: %x\n", mpic->flags); if ((mpic->flags & MPIC_BROKEN_U3) && (mpic->flags & MPIC_PRIMARY)) mpic_scan_ioapics(mpic); #endif /* CONFIG_MPIC_BROKEN_U3 */ 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); int level = 0; /* if it's an IPI, we skip it */ if ((mpic->irq_offset + i) >= (mpic->ipi_offset + i) && (mpic->irq_offset + i) < (mpic->ipi_offset + i + 4)) continue; /* do senses munging */ if (mpic->senses && i < mpic->senses_count) { if (mpic->senses[i] & IRQ_SENSE_LEVEL) vecpri |= MPIC_VECPRI_SENSE_LEVEL; if (mpic->senses[i] & IRQ_POLARITY_POSITIVE) vecpri |= MPIC_VECPRI_POLARITY_POSITIVE; } else vecpri |= MPIC_VECPRI_SENSE_LEVEL; /* remember if it was a level interrupts */ level = (vecpri & MPIC_VECPRI_SENSE_LEVEL); /* deal with broken U3 */ if (mpic->flags & MPIC_BROKEN_U3) { #ifdef CONFIG_MPIC_BROKEN_U3 if (mpic_is_ht_interrupt(mpic, i)) { vecpri &= ~(MPIC_VECPRI_SENSE_MASK | MPIC_VECPRI_POLARITY_MASK); vecpri |= MPIC_VECPRI_POLARITY_POSITIVE; } #else printk(KERN_ERR "mpic: BROKEN_U3 set, but CONFIG doesn't match\n"); #endif } DBG("setup source %d, vecpri: %08x, level: %d\n", i, vecpri, (level != 0)); /* init hw */ mpic_irq_write(i, MPIC_IRQ_VECTOR_PRI, vecpri); mpic_irq_write(i, MPIC_IRQ_DESTINATION, 1 << hard_smp_processor_id()); /* init linux descriptors */ if (i < mpic->irq_count) { irq_desc[mpic->irq_offset+i].status = level ? IRQ_LEVEL : 0; irq_desc[mpic->irq_offset+i].handler = &mpic->hc_irq; } } /* 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 mpic_irq_set_priority(unsigned int irq, unsigned int pri) { int is_ipi; struct mpic *mpic = mpic_find(irq, &is_ipi); unsigned long flags; u32 reg; spin_lock_irqsave(&mpic_lock, flags); if (is_ipi) { reg = mpic_ipi_read(irq - mpic->ipi_offset) & MPIC_VECPRI_PRIORITY_MASK; mpic_ipi_write(irq - mpic->ipi_offset, reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT)); } else { reg = mpic_irq_read(irq - mpic->irq_offset, MPIC_IRQ_VECTOR_PRI) & MPIC_VECPRI_PRIORITY_MASK; mpic_irq_write(irq - mpic->irq_offset, 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 long flags; u32 reg; spin_lock_irqsave(&mpic_lock, flags); if (is_ipi) reg = mpic_ipi_read(irq - mpic->ipi_offset); else reg = mpic_irq_read(irq - mpic->irq_offset, 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_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); DBG("%s: send_ipi(ipi_no: %d)\n", mpic->name, ipi_no); mpic_cpu_write(MPIC_CPU_IPI_DISPATCH_0 + ipi_no * 0x10, mpic_physmask(cpu_mask & cpus_addr(cpu_online_map)[0])); } int mpic_get_one_irq(struct mpic *mpic, struct pt_regs *regs) { u32 irq; irq = mpic_cpu_read(MPIC_CPU_INTACK) & MPIC_VECPRI_VECTOR_MASK; DBG("%s: get_one_irq(): %d\n", mpic->name, irq); if (mpic->cascade && irq == mpic->cascade_vec) { DBG("%s: cascading ...\n", mpic->name); irq = mpic->cascade(regs, mpic->cascade_data); mpic_eoi(mpic); return irq; } if (unlikely(irq == MPIC_VEC_SPURRIOUS)) return -1; if (irq < MPIC_VEC_IPI_0) return irq + mpic->irq_offset; DBG("%s: ipi %d !\n", mpic->name, irq - MPIC_VEC_IPI_0); return irq - MPIC_VEC_IPI_0 + mpic->ipi_offset; } 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; BUG_ON(mpic == NULL); printk("requesting IPIs ... \n"); /* IPIs are marked SA_INTERRUPT as they must run with irqs disabled */ request_irq(mpic->ipi_offset+0, mpic_ipi_action, SA_INTERRUPT, "IPI0 (call function)", mpic); request_irq(mpic->ipi_offset+1, mpic_ipi_action, SA_INTERRUPT, "IPI1 (reschedule)", mpic); request_irq(mpic->ipi_offset+2, mpic_ipi_action, SA_INTERRUPT, "IPI2 (unused)", mpic); request_irq(mpic->ipi_offset+3, mpic_ipi_action, SA_INTERRUPT, "IPI3 (debugger break)", mpic); printk("IPIs requested... \n"); } 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 */