/* * 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. * * Copyright (C) 2008 Ralf Baechle (ralf@linux-mips.org) * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define GIC_MAX_INTRS 256 /* Add 2 to convert GIC CPU pin to core interrupt */ #define GIC_CPU_PIN_OFFSET 2 /* Mapped interrupt to pin X, then GIC will generate the vector (X+1). */ #define GIC_PIN_TO_VEC_OFFSET 1 /* Convert between local/shared IRQ number and GIC HW IRQ number. */ #define GIC_LOCAL_HWIRQ_BASE 0 #define GIC_LOCAL_TO_HWIRQ(x) (GIC_LOCAL_HWIRQ_BASE + (x)) #define GIC_HWIRQ_TO_LOCAL(x) ((x) - GIC_LOCAL_HWIRQ_BASE) #define GIC_SHARED_HWIRQ_BASE GIC_NUM_LOCAL_INTRS #define GIC_SHARED_TO_HWIRQ(x) (GIC_SHARED_HWIRQ_BASE + (x)) #define GIC_HWIRQ_TO_SHARED(x) ((x) - GIC_SHARED_HWIRQ_BASE) unsigned int gic_present; void __iomem *mips_gic_base; struct gic_pcpu_mask { DECLARE_BITMAP(pcpu_mask, GIC_MAX_INTRS); }; static unsigned long __gic_base_addr; static struct gic_pcpu_mask pcpu_masks[NR_CPUS]; static DEFINE_SPINLOCK(gic_lock); static struct irq_domain *gic_irq_domain; static struct irq_domain *gic_ipi_domain; static int gic_shared_intrs; static int gic_vpes; static unsigned int gic_cpu_pin; static unsigned int timer_cpu_pin; static struct irq_chip gic_level_irq_controller, gic_edge_irq_controller; DECLARE_BITMAP(ipi_resrv, GIC_MAX_INTRS); DECLARE_BITMAP(ipi_available, GIC_MAX_INTRS); static void __gic_irq_dispatch(void); static bool gic_local_irq_is_routable(int intr) { u32 vpe_ctl; /* All local interrupts are routable in EIC mode. */ if (cpu_has_veic) return true; vpe_ctl = read_gic_vl_ctl(); switch (intr) { case GIC_LOCAL_INT_TIMER: return vpe_ctl & GIC_VX_CTL_TIMER_ROUTABLE; case GIC_LOCAL_INT_PERFCTR: return vpe_ctl & GIC_VX_CTL_PERFCNT_ROUTABLE; case GIC_LOCAL_INT_FDC: return vpe_ctl & GIC_VX_CTL_FDC_ROUTABLE; case GIC_LOCAL_INT_SWINT0: case GIC_LOCAL_INT_SWINT1: return vpe_ctl & GIC_VX_CTL_SWINT_ROUTABLE; default: return true; } } static void gic_bind_eic_interrupt(int irq, int set) { /* Convert irq vector # to hw int # */ irq -= GIC_PIN_TO_VEC_OFFSET; /* Set irq to use shadow set */ write_gic_vl_eic_shadow_set(irq, set); } static void gic_send_ipi(struct irq_data *d, unsigned int cpu) { irq_hw_number_t hwirq = GIC_HWIRQ_TO_SHARED(irqd_to_hwirq(d)); write_gic_wedge(GIC_WEDGE_RW | hwirq); } int gic_get_c0_compare_int(void) { if (!gic_local_irq_is_routable(GIC_LOCAL_INT_TIMER)) return MIPS_CPU_IRQ_BASE + cp0_compare_irq; return irq_create_mapping(gic_irq_domain, GIC_LOCAL_TO_HWIRQ(GIC_LOCAL_INT_TIMER)); } int gic_get_c0_perfcount_int(void) { if (!gic_local_irq_is_routable(GIC_LOCAL_INT_PERFCTR)) { /* Is the performance counter shared with the timer? */ if (cp0_perfcount_irq < 0) return -1; return MIPS_CPU_IRQ_BASE + cp0_perfcount_irq; } return irq_create_mapping(gic_irq_domain, GIC_LOCAL_TO_HWIRQ(GIC_LOCAL_INT_PERFCTR)); } int gic_get_c0_fdc_int(void) { if (!gic_local_irq_is_routable(GIC_LOCAL_INT_FDC)) { /* Is the FDC IRQ even present? */ if (cp0_fdc_irq < 0) return -1; return MIPS_CPU_IRQ_BASE + cp0_fdc_irq; } return irq_create_mapping(gic_irq_domain, GIC_LOCAL_TO_HWIRQ(GIC_LOCAL_INT_FDC)); } int gic_get_usm_range(struct resource *gic_usm_res) { if (!gic_present) return -1; gic_usm_res->start = __gic_base_addr + USM_VISIBLE_SECTION_OFS; gic_usm_res->end = gic_usm_res->start + (USM_VISIBLE_SECTION_SIZE - 1); return 0; } static void gic_handle_shared_int(bool chained) { unsigned int intr, virq; unsigned long *pcpu_mask; DECLARE_BITMAP(pending, GIC_MAX_INTRS); DECLARE_BITMAP(intrmask, GIC_MAX_INTRS); /* Get per-cpu bitmaps */ pcpu_mask = pcpu_masks[smp_processor_id()].pcpu_mask; if (mips_cm_is64) { __ioread64_copy(pending, addr_gic_pend(), DIV_ROUND_UP(gic_shared_intrs, 64)); __ioread64_copy(intrmask, addr_gic_mask(), DIV_ROUND_UP(gic_shared_intrs, 64)); } else { __ioread32_copy(pending, addr_gic_pend(), DIV_ROUND_UP(gic_shared_intrs, 32)); __ioread32_copy(intrmask, addr_gic_mask(), DIV_ROUND_UP(gic_shared_intrs, 32)); } bitmap_and(pending, pending, intrmask, gic_shared_intrs); bitmap_and(pending, pending, pcpu_mask, gic_shared_intrs); for_each_set_bit(intr, pending, gic_shared_intrs) { virq = irq_linear_revmap(gic_irq_domain, GIC_SHARED_TO_HWIRQ(intr)); if (chained) generic_handle_irq(virq); else do_IRQ(virq); } } static void gic_mask_irq(struct irq_data *d) { write_gic_rmask(BIT(GIC_HWIRQ_TO_SHARED(d->hwirq))); } static void gic_unmask_irq(struct irq_data *d) { write_gic_smask(BIT(GIC_HWIRQ_TO_SHARED(d->hwirq))); } static void gic_ack_irq(struct irq_data *d) { unsigned int irq = GIC_HWIRQ_TO_SHARED(d->hwirq); write_gic_wedge(irq); } static int gic_set_type(struct irq_data *d, unsigned int type) { unsigned int irq = GIC_HWIRQ_TO_SHARED(d->hwirq); unsigned long flags; bool is_edge; spin_lock_irqsave(&gic_lock, flags); switch (type & IRQ_TYPE_SENSE_MASK) { case IRQ_TYPE_EDGE_FALLING: change_gic_pol(irq, GIC_POL_FALLING_EDGE); change_gic_trig(irq, GIC_TRIG_EDGE); change_gic_dual(irq, GIC_DUAL_SINGLE); is_edge = true; break; case IRQ_TYPE_EDGE_RISING: change_gic_pol(irq, GIC_POL_RISING_EDGE); change_gic_trig(irq, GIC_TRIG_EDGE); change_gic_dual(irq, GIC_DUAL_SINGLE); is_edge = true; break; case IRQ_TYPE_EDGE_BOTH: /* polarity is irrelevant in this case */ change_gic_trig(irq, GIC_TRIG_EDGE); change_gic_dual(irq, GIC_DUAL_DUAL); is_edge = true; break; case IRQ_TYPE_LEVEL_LOW: change_gic_pol(irq, GIC_POL_ACTIVE_LOW); change_gic_trig(irq, GIC_TRIG_LEVEL); change_gic_dual(irq, GIC_DUAL_SINGLE); is_edge = false; break; case IRQ_TYPE_LEVEL_HIGH: default: change_gic_pol(irq, GIC_POL_ACTIVE_HIGH); change_gic_trig(irq, GIC_TRIG_LEVEL); change_gic_dual(irq, GIC_DUAL_SINGLE); is_edge = false; break; } if (is_edge) irq_set_chip_handler_name_locked(d, &gic_edge_irq_controller, handle_edge_irq, NULL); else irq_set_chip_handler_name_locked(d, &gic_level_irq_controller, handle_level_irq, NULL); spin_unlock_irqrestore(&gic_lock, flags); return 0; } #ifdef CONFIG_SMP static int gic_set_affinity(struct irq_data *d, const struct cpumask *cpumask, bool force) { unsigned int irq = GIC_HWIRQ_TO_SHARED(d->hwirq); cpumask_t tmp = CPU_MASK_NONE; unsigned long flags; int i; cpumask_and(&tmp, cpumask, cpu_online_mask); if (cpumask_empty(&tmp)) return -EINVAL; /* Assumption : cpumask refers to a single CPU */ spin_lock_irqsave(&gic_lock, flags); /* Re-route this IRQ */ write_gic_map_vp(irq, BIT(mips_cm_vp_id(cpumask_first(&tmp)))); /* Update the pcpu_masks */ for (i = 0; i < min(gic_vpes, NR_CPUS); i++) clear_bit(irq, pcpu_masks[i].pcpu_mask); set_bit(irq, pcpu_masks[cpumask_first(&tmp)].pcpu_mask); cpumask_copy(irq_data_get_affinity_mask(d), cpumask); spin_unlock_irqrestore(&gic_lock, flags); return IRQ_SET_MASK_OK_NOCOPY; } #endif static struct irq_chip gic_level_irq_controller = { .name = "MIPS GIC", .irq_mask = gic_mask_irq, .irq_unmask = gic_unmask_irq, .irq_set_type = gic_set_type, #ifdef CONFIG_SMP .irq_set_affinity = gic_set_affinity, #endif }; static struct irq_chip gic_edge_irq_controller = { .name = "MIPS GIC", .irq_ack = gic_ack_irq, .irq_mask = gic_mask_irq, .irq_unmask = gic_unmask_irq, .irq_set_type = gic_set_type, #ifdef CONFIG_SMP .irq_set_affinity = gic_set_affinity, #endif .ipi_send_single = gic_send_ipi, }; static void gic_handle_local_int(bool chained) { unsigned long pending, masked; unsigned int intr, virq; pending = read_gic_vl_pend(); masked = read_gic_vl_mask(); bitmap_and(&pending, &pending, &masked, GIC_NUM_LOCAL_INTRS); for_each_set_bit(intr, &pending, GIC_NUM_LOCAL_INTRS) { virq = irq_linear_revmap(gic_irq_domain, GIC_LOCAL_TO_HWIRQ(intr)); if (chained) generic_handle_irq(virq); else do_IRQ(virq); } } static void gic_mask_local_irq(struct irq_data *d) { int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq); write_gic_vl_rmask(BIT(intr)); } static void gic_unmask_local_irq(struct irq_data *d) { int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq); write_gic_vl_smask(BIT(intr)); } static struct irq_chip gic_local_irq_controller = { .name = "MIPS GIC Local", .irq_mask = gic_mask_local_irq, .irq_unmask = gic_unmask_local_irq, }; static void gic_mask_local_irq_all_vpes(struct irq_data *d) { int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq); int i; unsigned long flags; spin_lock_irqsave(&gic_lock, flags); for (i = 0; i < gic_vpes; i++) { write_gic_vl_other(mips_cm_vp_id(i)); write_gic_vo_rmask(BIT(intr)); } spin_unlock_irqrestore(&gic_lock, flags); } static void gic_unmask_local_irq_all_vpes(struct irq_data *d) { int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq); int i; unsigned long flags; spin_lock_irqsave(&gic_lock, flags); for (i = 0; i < gic_vpes; i++) { write_gic_vl_other(mips_cm_vp_id(i)); write_gic_vo_smask(BIT(intr)); } spin_unlock_irqrestore(&gic_lock, flags); } static struct irq_chip gic_all_vpes_local_irq_controller = { .name = "MIPS GIC Local", .irq_mask = gic_mask_local_irq_all_vpes, .irq_unmask = gic_unmask_local_irq_all_vpes, }; static void __gic_irq_dispatch(void) { gic_handle_local_int(false); gic_handle_shared_int(false); } static void gic_irq_dispatch(struct irq_desc *desc) { gic_handle_local_int(true); gic_handle_shared_int(true); } static void __init gic_basic_init(void) { unsigned int i; board_bind_eic_interrupt = &gic_bind_eic_interrupt; /* Setup defaults */ for (i = 0; i < gic_shared_intrs; i++) { change_gic_pol(i, GIC_POL_ACTIVE_HIGH); change_gic_trig(i, GIC_TRIG_LEVEL); write_gic_rmask(BIT(i)); } for (i = 0; i < gic_vpes; i++) { unsigned int j; write_gic_vl_other(mips_cm_vp_id(i)); for (j = 0; j < GIC_NUM_LOCAL_INTRS; j++) { if (!gic_local_irq_is_routable(j)) continue; write_gic_vo_rmask(BIT(j)); } } } static int gic_local_irq_domain_map(struct irq_domain *d, unsigned int virq, irq_hw_number_t hw) { int intr = GIC_HWIRQ_TO_LOCAL(hw); int i; unsigned long flags; u32 val; if (!gic_local_irq_is_routable(intr)) return -EPERM; if (intr > GIC_LOCAL_INT_FDC) { pr_err("Invalid local IRQ %d\n", intr); return -EINVAL; } if (intr == GIC_LOCAL_INT_TIMER) { /* CONFIG_MIPS_CMP workaround (see __gic_init) */ val = GIC_MAP_PIN_MAP_TO_PIN | timer_cpu_pin; } else { val = GIC_MAP_PIN_MAP_TO_PIN | gic_cpu_pin; } spin_lock_irqsave(&gic_lock, flags); for (i = 0; i < gic_vpes; i++) { write_gic_vl_other(mips_cm_vp_id(i)); write_gic_vo_map(intr, val); } spin_unlock_irqrestore(&gic_lock, flags); return 0; } static int gic_shared_irq_domain_map(struct irq_domain *d, unsigned int virq, irq_hw_number_t hw, unsigned int vpe) { int intr = GIC_HWIRQ_TO_SHARED(hw); unsigned long flags; int i; spin_lock_irqsave(&gic_lock, flags); write_gic_map_pin(intr, GIC_MAP_PIN_MAP_TO_PIN | gic_cpu_pin); write_gic_map_vp(intr, BIT(mips_cm_vp_id(vpe))); for (i = 0; i < min(gic_vpes, NR_CPUS); i++) clear_bit(intr, pcpu_masks[i].pcpu_mask); set_bit(intr, pcpu_masks[vpe].pcpu_mask); spin_unlock_irqrestore(&gic_lock, flags); return 0; } static int gic_irq_domain_xlate(struct irq_domain *d, struct device_node *ctrlr, const u32 *intspec, unsigned int intsize, irq_hw_number_t *out_hwirq, unsigned int *out_type) { if (intsize != 3) return -EINVAL; if (intspec[0] == GIC_SHARED) *out_hwirq = GIC_SHARED_TO_HWIRQ(intspec[1]); else if (intspec[0] == GIC_LOCAL) *out_hwirq = GIC_LOCAL_TO_HWIRQ(intspec[1]); else return -EINVAL; *out_type = intspec[2] & IRQ_TYPE_SENSE_MASK; return 0; } static int gic_irq_domain_map(struct irq_domain *d, unsigned int virq, irq_hw_number_t hwirq) { int err; if (hwirq >= GIC_SHARED_HWIRQ_BASE) { /* verify that shared irqs don't conflict with an IPI irq */ if (test_bit(GIC_HWIRQ_TO_SHARED(hwirq), ipi_resrv)) return -EBUSY; err = irq_domain_set_hwirq_and_chip(d, virq, hwirq, &gic_level_irq_controller, NULL); if (err) return err; return gic_shared_irq_domain_map(d, virq, hwirq, 0); } switch (GIC_HWIRQ_TO_LOCAL(hwirq)) { case GIC_LOCAL_INT_TIMER: case GIC_LOCAL_INT_PERFCTR: case GIC_LOCAL_INT_FDC: /* * HACK: These are all really percpu interrupts, but * the rest of the MIPS kernel code does not use the * percpu IRQ API for them. */ err = irq_domain_set_hwirq_and_chip(d, virq, hwirq, &gic_all_vpes_local_irq_controller, NULL); if (err) return err; irq_set_handler(virq, handle_percpu_irq); break; default: err = irq_domain_set_hwirq_and_chip(d, virq, hwirq, &gic_local_irq_controller, NULL); if (err) return err; irq_set_handler(virq, handle_percpu_devid_irq); irq_set_percpu_devid(virq); break; } return gic_local_irq_domain_map(d, virq, hwirq); } static int gic_irq_domain_alloc(struct irq_domain *d, unsigned int virq, unsigned int nr_irqs, void *arg) { struct irq_fwspec *fwspec = arg; irq_hw_number_t hwirq; if (fwspec->param[0] == GIC_SHARED) hwirq = GIC_SHARED_TO_HWIRQ(fwspec->param[1]); else hwirq = GIC_LOCAL_TO_HWIRQ(fwspec->param[1]); return gic_irq_domain_map(d, virq, hwirq); } void gic_irq_domain_free(struct irq_domain *d, unsigned int virq, unsigned int nr_irqs) { } static const struct irq_domain_ops gic_irq_domain_ops = { .xlate = gic_irq_domain_xlate, .alloc = gic_irq_domain_alloc, .free = gic_irq_domain_free, .map = gic_irq_domain_map, }; static int gic_ipi_domain_xlate(struct irq_domain *d, struct device_node *ctrlr, const u32 *intspec, unsigned int intsize, irq_hw_number_t *out_hwirq, unsigned int *out_type) { /* * There's nothing to translate here. hwirq is dynamically allocated and * the irq type is always edge triggered. * */ *out_hwirq = 0; *out_type = IRQ_TYPE_EDGE_RISING; return 0; } static int gic_ipi_domain_alloc(struct irq_domain *d, unsigned int virq, unsigned int nr_irqs, void *arg) { struct cpumask *ipimask = arg; irq_hw_number_t hwirq, base_hwirq; int cpu, ret, i; base_hwirq = find_first_bit(ipi_available, gic_shared_intrs); if (base_hwirq == gic_shared_intrs) return -ENOMEM; /* check that we have enough space */ for (i = base_hwirq; i < nr_irqs; i++) { if (!test_bit(i, ipi_available)) return -EBUSY; } bitmap_clear(ipi_available, base_hwirq, nr_irqs); /* map the hwirq for each cpu consecutively */ i = 0; for_each_cpu(cpu, ipimask) { hwirq = GIC_SHARED_TO_HWIRQ(base_hwirq + i); ret = irq_domain_set_hwirq_and_chip(d, virq + i, hwirq, &gic_edge_irq_controller, NULL); if (ret) goto error; ret = irq_domain_set_hwirq_and_chip(d->parent, virq + i, hwirq, &gic_edge_irq_controller, NULL); if (ret) goto error; ret = irq_set_irq_type(virq + i, IRQ_TYPE_EDGE_RISING); if (ret) goto error; ret = gic_shared_irq_domain_map(d, virq + i, hwirq, cpu); if (ret) goto error; i++; } return 0; error: bitmap_set(ipi_available, base_hwirq, nr_irqs); return ret; } void gic_ipi_domain_free(struct irq_domain *d, unsigned int virq, unsigned int nr_irqs) { irq_hw_number_t base_hwirq; struct irq_data *data; data = irq_get_irq_data(virq); if (!data) return; base_hwirq = GIC_HWIRQ_TO_SHARED(irqd_to_hwirq(data)); bitmap_set(ipi_available, base_hwirq, nr_irqs); } int gic_ipi_domain_match(struct irq_domain *d, struct device_node *node, enum irq_domain_bus_token bus_token) { bool is_ipi; switch (bus_token) { case DOMAIN_BUS_IPI: is_ipi = d->bus_token == bus_token; return (!node || to_of_node(d->fwnode) == node) && is_ipi; break; default: return 0; } } static const struct irq_domain_ops gic_ipi_domain_ops = { .xlate = gic_ipi_domain_xlate, .alloc = gic_ipi_domain_alloc, .free = gic_ipi_domain_free, .match = gic_ipi_domain_match, }; static void __init __gic_init(unsigned long gic_base_addr, unsigned long gic_addrspace_size, unsigned int cpu_vec, unsigned int irqbase, struct device_node *node) { unsigned int gicconfig, cpu; unsigned int v[2]; __gic_base_addr = gic_base_addr; mips_gic_base = ioremap_nocache(gic_base_addr, gic_addrspace_size); gicconfig = read_gic_config(); gic_shared_intrs = gicconfig & GIC_CONFIG_NUMINTERRUPTS; gic_shared_intrs >>= __fls(GIC_CONFIG_NUMINTERRUPTS); gic_shared_intrs = (gic_shared_intrs + 1) * 8; gic_vpes = gicconfig & GIC_CONFIG_PVPS; gic_vpes >>= __fls(GIC_CONFIG_PVPS); gic_vpes = gic_vpes + 1; if (cpu_has_veic) { /* Set EIC mode for all VPEs */ for_each_present_cpu(cpu) { write_gic_vl_other(mips_cm_vp_id(cpu)); write_gic_vo_ctl(GIC_VX_CTL_EIC); } /* Always use vector 1 in EIC mode */ gic_cpu_pin = 0; timer_cpu_pin = gic_cpu_pin; set_vi_handler(gic_cpu_pin + GIC_PIN_TO_VEC_OFFSET, __gic_irq_dispatch); } else { gic_cpu_pin = cpu_vec - GIC_CPU_PIN_OFFSET; irq_set_chained_handler(MIPS_CPU_IRQ_BASE + cpu_vec, gic_irq_dispatch); /* * With the CMP implementation of SMP (deprecated), other CPUs * are started by the bootloader and put into a timer based * waiting poll loop. We must not re-route those CPU's local * timer interrupts as the wait instruction will never finish, * so just handle whatever CPU interrupt it is routed to by * default. * * This workaround should be removed when CMP support is * dropped. */ if (IS_ENABLED(CONFIG_MIPS_CMP) && gic_local_irq_is_routable(GIC_LOCAL_INT_TIMER)) { timer_cpu_pin = read_gic_vl_timer_map() & GIC_MAP_PIN_MAP; irq_set_chained_handler(MIPS_CPU_IRQ_BASE + GIC_CPU_PIN_OFFSET + timer_cpu_pin, gic_irq_dispatch); } else { timer_cpu_pin = gic_cpu_pin; } } gic_irq_domain = irq_domain_add_simple(node, GIC_NUM_LOCAL_INTRS + gic_shared_intrs, irqbase, &gic_irq_domain_ops, NULL); if (!gic_irq_domain) panic("Failed to add GIC IRQ domain"); gic_ipi_domain = irq_domain_add_hierarchy(gic_irq_domain, IRQ_DOMAIN_FLAG_IPI_PER_CPU, GIC_NUM_LOCAL_INTRS + gic_shared_intrs, node, &gic_ipi_domain_ops, NULL); if (!gic_ipi_domain) panic("Failed to add GIC IPI domain"); irq_domain_update_bus_token(gic_ipi_domain, DOMAIN_BUS_IPI); if (node && !of_property_read_u32_array(node, "mti,reserved-ipi-vectors", v, 2)) { bitmap_set(ipi_resrv, v[0], v[1]); } else { /* Make the last 2 * gic_vpes available for IPIs */ bitmap_set(ipi_resrv, gic_shared_intrs - 2 * gic_vpes, 2 * gic_vpes); } bitmap_copy(ipi_available, ipi_resrv, GIC_MAX_INTRS); gic_basic_init(); } void __init gic_init(unsigned long gic_base_addr, unsigned long gic_addrspace_size, unsigned int cpu_vec, unsigned int irqbase) { __gic_init(gic_base_addr, gic_addrspace_size, cpu_vec, irqbase, NULL); } static int __init gic_of_init(struct device_node *node, struct device_node *parent) { struct resource res; unsigned int cpu_vec, i = 0, reserved = 0; phys_addr_t gic_base; size_t gic_len; /* Find the first available CPU vector. */ while (!of_property_read_u32_index(node, "mti,reserved-cpu-vectors", i++, &cpu_vec)) reserved |= BIT(cpu_vec); for (cpu_vec = 2; cpu_vec < 8; cpu_vec++) { if (!(reserved & BIT(cpu_vec))) break; } if (cpu_vec == 8) { pr_err("No CPU vectors available for GIC\n"); return -ENODEV; } if (of_address_to_resource(node, 0, &res)) { /* * Probe the CM for the GIC base address if not specified * in the device-tree. */ if (mips_cm_present()) { gic_base = read_gcr_gic_base() & ~CM_GCR_GIC_BASE_GICEN; gic_len = 0x20000; } else { pr_err("Failed to get GIC memory range\n"); return -ENODEV; } } else { gic_base = res.start; gic_len = resource_size(&res); } if (mips_cm_present()) { write_gcr_gic_base(gic_base | CM_GCR_GIC_BASE_GICEN); /* Ensure GIC region is enabled before trying to access it */ __sync(); } gic_present = true; __gic_init(gic_base, gic_len, cpu_vec, 0, node); return 0; } IRQCHIP_DECLARE(mips_gic, "mti,gic", gic_of_init);