// SPDX-License-Identifier: GPL-2.0-or-later /* * 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. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "pmac.h" #ifdef CONFIG_PPC32 struct pmac_irq_hw { unsigned int event; unsigned int enable; unsigned int ack; unsigned int level; }; /* Workaround flags for 32bit powermac machines */ unsigned int of_irq_workarounds; struct device_node *of_irq_dflt_pic; /* Default addresses */ static volatile struct pmac_irq_hw __iomem *pmac_irq_hw[4]; static int max_irqs; static int max_real_irqs; static DEFINE_RAW_SPINLOCK(pmac_pic_lock); /* The max irq number this driver deals with is 128; see max_irqs */ static DECLARE_BITMAP(ppc_lost_interrupts, 128); static DECLARE_BITMAP(ppc_cached_irq_mask, 128); static int pmac_irq_cascade = -1; static struct irq_domain *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(struct irq_data *d) { unsigned int src = irqd_to_hwirq(d); unsigned long bit = 1UL << (src & 0x1f); int i = src >> 5; unsigned long flags; raw_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)); raw_spin_unlock_irqrestore(&pmac_pic_lock, flags); } static void pmac_ack_irq(struct irq_data *d) { unsigned int src = irqd_to_hwirq(d); unsigned long bit = 1UL << (src & 0x1f); int i = src >> 5; unsigned long flags; raw_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); raw_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(struct irq_data *d) { unsigned long flags; unsigned int src = irqd_to_hwirq(d); unsigned long bit = 1UL << (src & 0x1f); int i = src >> 5; raw_spin_lock_irqsave(&pmac_pic_lock, flags); if (!irqd_is_level_type(d)) out_le32(&pmac_irq_hw[i]->ack, bit); __set_bit(src, ppc_cached_irq_mask); __pmac_set_irq_mask(src, 0); raw_spin_unlock_irqrestore(&pmac_pic_lock, flags); return 0; } static void pmac_mask_irq(struct irq_data *d) { unsigned long flags; unsigned int src = irqd_to_hwirq(d); raw_spin_lock_irqsave(&pmac_pic_lock, flags); __clear_bit(src, ppc_cached_irq_mask); __pmac_set_irq_mask(src, 1); raw_spin_unlock_irqrestore(&pmac_pic_lock, flags); } static void pmac_unmask_irq(struct irq_data *d) { unsigned long flags; unsigned int src = irqd_to_hwirq(d); raw_spin_lock_irqsave(&pmac_pic_lock, flags); __set_bit(src, ppc_cached_irq_mask); __pmac_set_irq_mask(src, 0); raw_spin_unlock_irqrestore(&pmac_pic_lock, flags); } static int pmac_retrigger(struct irq_data *d) { unsigned long flags; raw_spin_lock_irqsave(&pmac_pic_lock, flags); __pmac_retrigger(irqd_to_hwirq(d)); raw_spin_unlock_irqrestore(&pmac_pic_lock, flags); return 1; } static struct irq_chip pmac_pic = { .name = "PMAC-PIC", .irq_startup = pmac_startup_irq, .irq_mask = pmac_mask_irq, .irq_ack = pmac_ack_irq, .irq_mask_ack = pmac_mask_and_ack_irq, .irq_unmask = pmac_unmask_irq, .irq_retrigger = pmac_retrigger, }; static irqreturn_t gatwick_action(int cpl, void *dev_id) { unsigned long flags; int irq, bits; int rc = IRQ_NONE; raw_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]; bits |= in_le32(&pmac_irq_hw[i]->level); bits &= ppc_cached_irq_mask[i]; if (bits == 0) continue; irq += __ilog2(bits); raw_spin_unlock_irqrestore(&pmac_pic_lock, flags); generic_handle_irq(irq); raw_spin_lock_irqsave(&pmac_pic_lock, flags); rc = IRQ_HANDLED; } raw_spin_unlock_irqrestore(&pmac_pic_lock, flags); return rc; } static unsigned int pmac_pic_get_irq(void) { int irq; unsigned long bits = 0; unsigned long flags; #ifdef CONFIG_PPC_PMAC32_PSURGE /* IPI's are a hack on the powersurge -- Cort */ if (smp_processor_id() != 0) { return psurge_secondary_virq; } #endif /* CONFIG_PPC_PMAC32_PSURGE */ raw_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]; bits |= in_le32(&pmac_irq_hw[i]->level); bits &= ppc_cached_irq_mask[i]; if (bits == 0) continue; irq += __ilog2(bits); break; } raw_spin_unlock_irqrestore(&pmac_pic_lock, flags); if (unlikely(irq < 0)) return 0; return irq_linear_revmap(pmac_pic_host, irq); } static int pmac_pic_host_match(struct irq_domain *h, struct device_node *node, enum irq_domain_bus_token bus_token) { /* We match all, we don't always have a node anyway */ return 1; } static int pmac_pic_host_map(struct irq_domain *h, unsigned int virq, irq_hw_number_t hw) { if (hw >= max_irqs) return -EINVAL; /* Mark level interrupts, set delayed disable for edge ones and set * handlers */ irq_set_status_flags(virq, IRQ_LEVEL); irq_set_chip_and_handler(virq, &pmac_pic, handle_level_irq); return 0; } static const struct irq_domain_ops pmac_pic_host_ops = { .match = pmac_pic_host_match, .map = pmac_pic_host_map, .xlate = irq_domain_xlate_onecell, }; 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; } else if ((master = of_find_node_by_name(NULL, "ohare")) != NULL) { max_irqs = max_real_irqs = 32; /* We might have a second cascaded ohare */ slave = of_find_node_by_name(NULL, "pci106b,7"); if (slave) max_irqs = 64; } else if ((master = of_find_node_by_name(NULL, "mac-io")) != NULL) { max_irqs = max_real_irqs = 64; /* We might have a second cascaded heathrow */ /* Compensate for of_node_put() in of_find_node_by_name() */ of_node_get(master); slave = of_find_node_by_name(master, "mac-io"); /* Check ordering of master & slave */ if (of_device_is_compatible(master, "gatwick")) { BUG_ON(slave == NULL); swap(master, slave); } /* We found a slave */ if (slave) max_irqs = 128; } BUG_ON(master == NULL); /* * Allocate an irq host */ pmac_pic_host = irq_domain_add_linear(master, max_irqs, &pmac_pic_host_ops, NULL); 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 %pOF for %d irqs\n", master, 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 %pOF for %d irqs" " cascade: %d\n", slave, 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) { if (request_irq(pmac_irq_cascade, gatwick_action, IRQF_NO_THREAD, "cascade", NULL)) pr_err("Failed to register cascade interrupt\n"); } printk(KERN_INFO "irq: System has %d possible interrupts\n", max_irqs); #ifdef CONFIG_XMON i = irq_create_mapping(NULL, 20); if (request_irq(i, xmon_irq, IRQF_NO_THREAD, "NMI - XMON", NULL)) pr_err("Failed to register NMI-XMON interrupt\n"); #endif } int of_irq_parse_oldworld(const struct device_node *device, int index, struct of_phandle_args *out_irq) { const u32 *ints = NULL; int intlen; /* * Old machines just have a list of interrupt numbers * and no interrupt-controller nodes. We also have dodgy * cases where the APPL,interrupts property is completely * missing behind pci-pci bridges and we have to get it * from the parent (the bridge itself, as apple just wired * everything together on these) */ while (device) { ints = of_get_property(device, "AAPL,interrupts", &intlen); if (ints != NULL) break; device = device->parent; if (!of_node_is_type(device, "pci")) break; } if (ints == NULL) return -EINVAL; intlen /= sizeof(u32); if (index >= intlen) return -EINVAL; out_irq->np = NULL; out_irq->args[0] = ints[index]; out_irq->args_count = 1; return 0; } #endif /* CONFIG_PPC32 */ 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) { mpic_irq_set_priority(nmi_irq, 9); if (request_irq(nmi_irq, xmon_irq, IRQF_NO_THREAD, "NMI - XMON", NULL)) pr_err("Failed to register NMI-XMON interrupt\n"); } 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 mpic *mpic; unsigned int flags = master ? 0 : MPIC_SECONDARY; pmac_call_feature(PMAC_FTR_ENABLE_MPIC, np, 0, 0); if (of_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_U3_HT_IRQS; mpic = mpic_alloc(np, 0, 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; /* We can have up to 2 MPICs cascaded */ for_each_node_by_type(np, "open-pic") { if (master == NULL && !of_property_present(np, "interrupts")) master = of_node_get(np); else if (slave == NULL) slave = of_node_get(np); if (master && slave) { of_node_put(np); 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); /* Set up a cascaded controller, if present */ if (slave) { 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; } void __init pmac_pic_init(void) { /* We configure the OF parsing based on our oldworld vs. newworld * platform type and whether we were booted by BootX. */ #ifdef CONFIG_PPC32 if (!pmac_newworld) of_irq_workarounds |= OF_IMAP_OLDWORLD_MAC; if (of_get_property(of_chosen, "linux,bootx", NULL) != NULL) of_irq_workarounds |= OF_IMAP_NO_PHANDLE; /* If we don't have phandles on a newworld, then try to locate a * default interrupt controller (happens when booting with BootX). * We do a first match here, hopefully, that only ever happens on * machines with one controller. */ if (pmac_newworld && (of_irq_workarounds & OF_IMAP_NO_PHANDLE)) { struct device_node *np; for_each_node_with_property(np, "interrupt-controller") { /* Skip /chosen/interrupt-controller */ if (of_node_name_eq(np, "chosen")) continue; /* It seems like at least one person wants * to use BootX on a machine with an AppleKiwi * controller which happens to pretend to be an * interrupt controller too. */ if (of_node_name_eq(np, "AppleKiwi")) continue; /* I think we found one ! */ of_irq_dflt_pic = np; break; } } #endif /* CONFIG_PPC32 */ /* 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); of_node_put(np); not_found: #endif /* CONFIG_ADB_PMU */ return viaint; } static int pmacpic_suspend(void) { 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 void pmacpic_resume(void) { 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(irq_get_irq_data(i)); } static struct syscore_ops pmacpic_syscore_ops = { .suspend = pmacpic_suspend, .resume = pmacpic_resume, }; static int __init init_pmacpic_syscore(void) { if (pmac_irq_hw[0]) register_syscore_ops(&pmacpic_syscore_ops); return 0; } machine_subsys_initcall(powermac, init_pmacpic_syscore); #endif /* CONFIG_PM && CONFIG_PPC32 */