/* * Support for the interrupt controllers found on Power Macintosh, * currently Apple's "Grand Central" interrupt controller in all * it's incarnations. OpenPIC support used on newer machines is * in a separate file * * Copyright (C) 1997 Paul Mackerras (paulus@samba.org) * Copyright (C) 2005 Benjamin Herrenschmidt (benh@kernel.crashing.org) * IBM, Corp. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "pmac.h" /* * XXX this should be in xmon.h, but putting it there means xmon.h * has to include (to get irqreturn_t), which * causes all sorts of problems. -- paulus */ extern irqreturn_t xmon_irq(int, void *, struct pt_regs *); #ifdef CONFIG_PPC32 struct pmac_irq_hw { unsigned int event; unsigned int enable; unsigned int ack; unsigned int level; }; /* Default addresses */ static volatile struct pmac_irq_hw __iomem *pmac_irq_hw[4]; #define GC_LEVEL_MASK 0x3ff00000 #define OHARE_LEVEL_MASK 0x1ff00000 #define HEATHROW_LEVEL_MASK 0x1ff00000 static int max_irqs; static int max_real_irqs; static u32 level_mask[4]; static DEFINE_SPINLOCK(pmac_pic_lock); #define NR_MASK_WORDS ((NR_IRQS + 31) / 32) static unsigned long ppc_lost_interrupts[NR_MASK_WORDS]; static unsigned long ppc_cached_irq_mask[NR_MASK_WORDS]; static int pmac_irq_cascade = -1; static struct irq_host *pmac_pic_host; static void __pmac_retrigger(unsigned int irq_nr) { if (irq_nr >= max_real_irqs && pmac_irq_cascade > 0) { __set_bit(irq_nr, ppc_lost_interrupts); irq_nr = pmac_irq_cascade; mb(); } if (!__test_and_set_bit(irq_nr, ppc_lost_interrupts)) { atomic_inc(&ppc_n_lost_interrupts); set_dec(1); } } static void pmac_mask_and_ack_irq(unsigned int virq) { unsigned int src = irq_map[virq].hwirq; unsigned long bit = 1UL << (src & 0x1f); int i = src >> 5; unsigned long flags; spin_lock_irqsave(&pmac_pic_lock, flags); __clear_bit(src, ppc_cached_irq_mask); if (__test_and_clear_bit(src, ppc_lost_interrupts)) atomic_dec(&ppc_n_lost_interrupts); out_le32(&pmac_irq_hw[i]->enable, ppc_cached_irq_mask[i]); out_le32(&pmac_irq_hw[i]->ack, bit); do { /* make sure ack gets to controller before we enable interrupts */ mb(); } while((in_le32(&pmac_irq_hw[i]->enable) & bit) != (ppc_cached_irq_mask[i] & bit)); spin_unlock_irqrestore(&pmac_pic_lock, flags); } static void pmac_ack_irq(unsigned int virq) { unsigned int src = irq_map[virq].hwirq; unsigned long bit = 1UL << (src & 0x1f); int i = src >> 5; unsigned long flags; spin_lock_irqsave(&pmac_pic_lock, flags); if (__test_and_clear_bit(src, ppc_lost_interrupts)) atomic_dec(&ppc_n_lost_interrupts); out_le32(&pmac_irq_hw[i]->ack, bit); (void)in_le32(&pmac_irq_hw[i]->ack); spin_unlock_irqrestore(&pmac_pic_lock, flags); } static void __pmac_set_irq_mask(unsigned int irq_nr, int nokicklost) { unsigned long bit = 1UL << (irq_nr & 0x1f); int i = irq_nr >> 5; if ((unsigned)irq_nr >= max_irqs) return; /* enable unmasked interrupts */ out_le32(&pmac_irq_hw[i]->enable, ppc_cached_irq_mask[i]); do { /* make sure mask gets to controller before we return to user */ mb(); } while((in_le32(&pmac_irq_hw[i]->enable) & bit) != (ppc_cached_irq_mask[i] & bit)); /* * Unfortunately, setting the bit in the enable register * when the device interrupt is already on *doesn't* set * the bit in the flag register or request another interrupt. */ if (bit & ppc_cached_irq_mask[i] & in_le32(&pmac_irq_hw[i]->level)) __pmac_retrigger(irq_nr); } /* When an irq gets requested for the first client, if it's an * edge interrupt, we clear any previous one on the controller */ static unsigned int pmac_startup_irq(unsigned int virq) { unsigned long flags; unsigned int src = irq_map[virq].hwirq; unsigned long bit = 1UL << (src & 0x1f); int i = src >> 5; spin_lock_irqsave(&pmac_pic_lock, flags); if ((irq_desc[virq].status & IRQ_LEVEL) == 0) out_le32(&pmac_irq_hw[i]->ack, bit); __set_bit(src, ppc_cached_irq_mask); __pmac_set_irq_mask(src, 0); spin_unlock_irqrestore(&pmac_pic_lock, flags); return 0; } static void pmac_mask_irq(unsigned int virq) { unsigned long flags; unsigned int src = irq_map[virq].hwirq; spin_lock_irqsave(&pmac_pic_lock, flags); __clear_bit(src, ppc_cached_irq_mask); __pmac_set_irq_mask(src, 1); spin_unlock_irqrestore(&pmac_pic_lock, flags); } static void pmac_unmask_irq(unsigned int virq) { unsigned long flags; unsigned int src = irq_map[virq].hwirq; spin_lock_irqsave(&pmac_pic_lock, flags); __set_bit(src, ppc_cached_irq_mask); __pmac_set_irq_mask(src, 0); spin_unlock_irqrestore(&pmac_pic_lock, flags); } static int pmac_retrigger(unsigned int virq) { unsigned long flags; spin_lock_irqsave(&pmac_pic_lock, flags); __pmac_retrigger(irq_map[virq].hwirq); spin_unlock_irqrestore(&pmac_pic_lock, flags); return 1; } static struct irq_chip pmac_pic = { .typename = " PMAC-PIC ", .startup = pmac_startup_irq, .mask = pmac_mask_irq, .ack = pmac_ack_irq, .mask_ack = pmac_mask_and_ack_irq, .unmask = pmac_unmask_irq, .retrigger = pmac_retrigger, }; static irqreturn_t gatwick_action(int cpl, void *dev_id, struct pt_regs *regs) { unsigned long flags; int irq, bits; int rc = IRQ_NONE; spin_lock_irqsave(&pmac_pic_lock, flags); for (irq = max_irqs; (irq -= 32) >= max_real_irqs; ) { int i = irq >> 5; bits = in_le32(&pmac_irq_hw[i]->event) | ppc_lost_interrupts[i]; /* We must read level interrupts from the level register */ bits |= (in_le32(&pmac_irq_hw[i]->level) & level_mask[i]); bits &= ppc_cached_irq_mask[i]; if (bits == 0) continue; irq += __ilog2(bits); spin_unlock_irqrestore(&pmac_pic_lock, flags); __do_IRQ(irq); spin_lock_irqsave(&pmac_pic_lock, flags); rc = IRQ_HANDLED; } spin_unlock_irqrestore(&pmac_pic_lock, flags); return rc; } static unsigned int pmac_pic_get_irq(struct pt_regs *regs) { int irq; unsigned long bits = 0; unsigned long flags; #ifdef CONFIG_SMP void psurge_smp_message_recv(struct pt_regs *); /* IPI's are a hack on the powersurge -- Cort */ if ( smp_processor_id() != 0 ) { psurge_smp_message_recv(regs); return NO_IRQ_IGNORE; /* ignore, already handled */ } #endif /* CONFIG_SMP */ spin_lock_irqsave(&pmac_pic_lock, flags); for (irq = max_real_irqs; (irq -= 32) >= 0; ) { int i = irq >> 5; bits = in_le32(&pmac_irq_hw[i]->event) | ppc_lost_interrupts[i]; /* We must read level interrupts from the level register */ bits |= (in_le32(&pmac_irq_hw[i]->level) & level_mask[i]); bits &= ppc_cached_irq_mask[i]; if (bits == 0) continue; irq += __ilog2(bits); break; } spin_unlock_irqrestore(&pmac_pic_lock, flags); if (unlikely(irq < 0)) return NO_IRQ; return irq_linear_revmap(pmac_pic_host, irq); } #ifdef CONFIG_XMON static struct irqaction xmon_action = { .handler = xmon_irq, .flags = 0, .mask = CPU_MASK_NONE, .name = "NMI - XMON" }; #endif static struct irqaction gatwick_cascade_action = { .handler = gatwick_action, .flags = IRQF_DISABLED, .mask = CPU_MASK_NONE, .name = "cascade", }; static int pmac_pic_host_match(struct irq_host *h, struct device_node *node) { /* We match all, we don't always have a node anyway */ return 1; } static int pmac_pic_host_map(struct irq_host *h, unsigned int virq, irq_hw_number_t hw) { struct irq_desc *desc = get_irq_desc(virq); int level; if (hw >= max_irqs) return -EINVAL; /* Mark level interrupts, set delayed disable for edge ones and set * handlers */ level = !!(level_mask[hw >> 5] & (1UL << (hw & 0x1f))); if (level) desc->status |= IRQ_LEVEL; else desc->status |= IRQ_DELAYED_DISABLE; set_irq_chip_and_handler(virq, &pmac_pic, level ? handle_level_irq : handle_edge_irq); return 0; } static int pmac_pic_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) { *out_flags = IRQ_TYPE_NONE; *out_hwirq = *intspec; return 0; } static struct irq_host_ops pmac_pic_host_ops = { .match = pmac_pic_host_match, .map = pmac_pic_host_map, .xlate = pmac_pic_host_xlate, }; static void __init pmac_pic_probe_oldstyle(void) { int i; struct device_node *master = NULL; struct device_node *slave = NULL; u8 __iomem *addr; struct resource r; /* Set our get_irq function */ ppc_md.get_irq = pmac_pic_get_irq; /* * Find the interrupt controller type & node */ if ((master = of_find_node_by_name(NULL, "gc")) != NULL) { max_irqs = max_real_irqs = 32; level_mask[0] = GC_LEVEL_MASK; } else if ((master = of_find_node_by_name(NULL, "ohare")) != NULL) { max_irqs = max_real_irqs = 32; level_mask[0] = OHARE_LEVEL_MASK; /* We might have a second cascaded ohare */ slave = of_find_node_by_name(NULL, "pci106b,7"); if (slave) { max_irqs = 64; level_mask[1] = OHARE_LEVEL_MASK; } } else if ((master = of_find_node_by_name(NULL, "mac-io")) != NULL) { max_irqs = max_real_irqs = 64; level_mask[0] = HEATHROW_LEVEL_MASK; level_mask[1] = 0; /* We might have a second cascaded heathrow */ slave = of_find_node_by_name(master, "mac-io"); /* Check ordering of master & slave */ if (device_is_compatible(master, "gatwick")) { struct device_node *tmp; BUG_ON(slave == NULL); tmp = master; master = slave; slave = tmp; } /* We found a slave */ if (slave) { max_irqs = 128; level_mask[2] = HEATHROW_LEVEL_MASK; level_mask[3] = 0; } } BUG_ON(master == NULL); /* * Allocate an irq host */ pmac_pic_host = irq_alloc_host(IRQ_HOST_MAP_LINEAR, max_irqs, &pmac_pic_host_ops, max_irqs); BUG_ON(pmac_pic_host == NULL); irq_set_default_host(pmac_pic_host); /* Get addresses of first controller if we have a node for it */ BUG_ON(of_address_to_resource(master, 0, &r)); /* Map interrupts of primary controller */ addr = (u8 __iomem *) ioremap(r.start, 0x40); i = 0; pmac_irq_hw[i++] = (volatile struct pmac_irq_hw __iomem *) (addr + 0x20); if (max_real_irqs > 32) pmac_irq_hw[i++] = (volatile struct pmac_irq_hw __iomem *) (addr + 0x10); of_node_put(master); printk(KERN_INFO "irq: Found primary Apple PIC %s for %d irqs\n", master->full_name, max_real_irqs); /* Map interrupts of cascaded controller */ if (slave && !of_address_to_resource(slave, 0, &r)) { addr = (u8 __iomem *)ioremap(r.start, 0x40); pmac_irq_hw[i++] = (volatile struct pmac_irq_hw __iomem *) (addr + 0x20); if (max_irqs > 64) pmac_irq_hw[i++] = (volatile struct pmac_irq_hw __iomem *) (addr + 0x10); pmac_irq_cascade = irq_of_parse_and_map(slave, 0); printk(KERN_INFO "irq: Found slave Apple PIC %s for %d irqs" " cascade: %d\n", slave->full_name, max_irqs - max_real_irqs, pmac_irq_cascade); } of_node_put(slave); /* Disable all interrupts in all controllers */ for (i = 0; i * 32 < max_irqs; ++i) out_le32(&pmac_irq_hw[i]->enable, 0); /* Hookup cascade irq */ if (slave && pmac_irq_cascade != NO_IRQ) setup_irq(pmac_irq_cascade, &gatwick_cascade_action); printk(KERN_INFO "irq: System has %d possible interrupts\n", max_irqs); #ifdef CONFIG_XMON setup_irq(irq_create_mapping(NULL, 20), &xmon_action); #endif } #endif /* CONFIG_PPC32 */ static void pmac_u3_cascade(unsigned int irq, struct irq_desc *desc) { struct mpic *mpic = desc->handler_data; unsigned int cascade_irq = mpic_get_one_irq(mpic, get_irq_regs()); if (cascade_irq != NO_IRQ) generic_handle_irq(cascade_irq); desc->chip->eoi(irq); } static void __init pmac_pic_setup_mpic_nmi(struct mpic *mpic) { #if defined(CONFIG_XMON) && defined(CONFIG_PPC32) struct device_node* pswitch; int nmi_irq; pswitch = of_find_node_by_name(NULL, "programmer-switch"); if (pswitch) { nmi_irq = irq_of_parse_and_map(pswitch, 0); if (nmi_irq != NO_IRQ) { mpic_irq_set_priority(nmi_irq, 9); setup_irq(nmi_irq, &xmon_action); } of_node_put(pswitch); } #endif /* defined(CONFIG_XMON) && defined(CONFIG_PPC32) */ } static struct mpic * __init pmac_setup_one_mpic(struct device_node *np, int master) { const char *name = master ? " MPIC 1 " : " MPIC 2 "; struct resource r; struct mpic *mpic; unsigned int flags = master ? MPIC_PRIMARY : 0; int rc; rc = of_address_to_resource(np, 0, &r); if (rc) return NULL; pmac_call_feature(PMAC_FTR_ENABLE_MPIC, np, 0, 0); flags |= MPIC_WANTS_RESET; if (get_property(np, "big-endian", NULL)) flags |= MPIC_BIG_ENDIAN; /* Primary Big Endian means HT interrupts. This is quite dodgy * but works until I find a better way */ if (master && (flags & MPIC_BIG_ENDIAN)) flags |= MPIC_BROKEN_U3; mpic = mpic_alloc(np, r.start, flags, 0, 0, name); if (mpic == NULL) return NULL; mpic_init(mpic); return mpic; } static int __init pmac_pic_probe_mpic(void) { struct mpic *mpic1, *mpic2; struct device_node *np, *master = NULL, *slave = NULL; unsigned int cascade; /* We can have up to 2 MPICs cascaded */ for (np = NULL; (np = of_find_node_by_type(np, "open-pic")) != NULL;) { if (master == NULL && get_property(np, "interrupts", NULL) == NULL) master = of_node_get(np); else if (slave == NULL) slave = of_node_get(np); if (master && slave) break; } /* Check for bogus setups */ if (master == NULL && slave != NULL) { master = slave; slave = NULL; } /* Not found, default to good old pmac pic */ if (master == NULL) return -ENODEV; /* Set master handler */ ppc_md.get_irq = mpic_get_irq; /* Setup master */ mpic1 = pmac_setup_one_mpic(master, 1); BUG_ON(mpic1 == NULL); /* Install NMI if any */ pmac_pic_setup_mpic_nmi(mpic1); of_node_put(master); /* No slave, let's go out */ if (slave == NULL) return 0; /* Get/Map slave interrupt */ cascade = irq_of_parse_and_map(slave, 0); if (cascade == NO_IRQ) { printk(KERN_ERR "Failed to map cascade IRQ\n"); return 0; } mpic2 = pmac_setup_one_mpic(slave, 0); if (mpic2 == NULL) { printk(KERN_ERR "Failed to setup slave MPIC\n"); of_node_put(slave); return 0; } set_irq_data(cascade, mpic2); set_irq_chained_handler(cascade, pmac_u3_cascade); of_node_put(slave); return 0; } void __init pmac_pic_init(void) { unsigned int flags = 0; /* We configure the OF parsing based on our oldworld vs. newworld * platform type and wether we were booted by BootX. */ #ifdef CONFIG_PPC32 if (!pmac_newworld) flags |= OF_IMAP_OLDWORLD_MAC; if (get_property(of_chosen, "linux,bootx", NULL) != NULL) flags |= OF_IMAP_NO_PHANDLE; #endif /* CONFIG_PPC_32 */ of_irq_map_init(flags); /* We first try to detect Apple's new Core99 chipset, since mac-io * is quite different on those machines and contains an IBM MPIC2. */ if (pmac_pic_probe_mpic() == 0) return; #ifdef CONFIG_PPC32 pmac_pic_probe_oldstyle(); #endif } #if defined(CONFIG_PM) && defined(CONFIG_PPC32) /* * These procedures are used in implementing sleep on the powerbooks. * sleep_save_intrs() saves the states of all interrupt enables * and disables all interrupts except for the nominated one. * sleep_restore_intrs() restores the states of all interrupt enables. */ unsigned long sleep_save_mask[2]; /* This used to be passed by the PMU driver but that link got * broken with the new driver model. We use this tweak for now... * We really want to do things differently though... */ static int pmacpic_find_viaint(void) { int viaint = -1; #ifdef CONFIG_ADB_PMU struct device_node *np; if (pmu_get_model() != PMU_OHARE_BASED) goto not_found; np = of_find_node_by_name(NULL, "via-pmu"); if (np == NULL) goto not_found; viaint = irq_of_parse_and_map(np, 0);; #endif /* CONFIG_ADB_PMU */ not_found: return viaint; } static int pmacpic_suspend(struct sys_device *sysdev, pm_message_t state) { int viaint = pmacpic_find_viaint(); sleep_save_mask[0] = ppc_cached_irq_mask[0]; sleep_save_mask[1] = ppc_cached_irq_mask[1]; ppc_cached_irq_mask[0] = 0; ppc_cached_irq_mask[1] = 0; if (viaint > 0) set_bit(viaint, ppc_cached_irq_mask); out_le32(&pmac_irq_hw[0]->enable, ppc_cached_irq_mask[0]); if (max_real_irqs > 32) out_le32(&pmac_irq_hw[1]->enable, ppc_cached_irq_mask[1]); (void)in_le32(&pmac_irq_hw[0]->event); /* make sure mask gets to controller before we return to caller */ mb(); (void)in_le32(&pmac_irq_hw[0]->enable); return 0; } static int pmacpic_resume(struct sys_device *sysdev) { int i; out_le32(&pmac_irq_hw[0]->enable, 0); if (max_real_irqs > 32) out_le32(&pmac_irq_hw[1]->enable, 0); mb(); for (i = 0; i < max_real_irqs; ++i) if (test_bit(i, sleep_save_mask)) pmac_unmask_irq(i); return 0; } #endif /* CONFIG_PM && CONFIG_PPC32 */ static struct sysdev_class pmacpic_sysclass = { set_kset_name("pmac_pic"), }; static struct sys_device device_pmacpic = { .id = 0, .cls = &pmacpic_sysclass, }; static struct sysdev_driver driver_pmacpic = { #if defined(CONFIG_PM) && defined(CONFIG_PPC32) .suspend = &pmacpic_suspend, .resume = &pmacpic_resume, #endif /* CONFIG_PM && CONFIG_PPC32 */ }; static int __init init_pmacpic_sysfs(void) { #ifdef CONFIG_PPC32 if (max_irqs == 0) return -ENODEV; #endif printk(KERN_DEBUG "Registering pmac pic with sysfs...\n"); sysdev_class_register(&pmacpic_sysclass); sysdev_register(&device_pmacpic); sysdev_driver_register(&pmacpic_sysclass, &driver_pmacpic); return 0; } subsys_initcall(init_pmacpic_sysfs);