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path: root/drivers/irqchip/irq-mips-gic.c
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-rw-r--r--drivers/irqchip/irq-mips-gic.c872
1 files changed, 872 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-mips-gic.c b/drivers/irqchip/irq-mips-gic.c
new file mode 100644
index 000000000..269c2354c
--- /dev/null
+++ b/drivers/irqchip/irq-mips-gic.c
@@ -0,0 +1,872 @@
+/*
+ * 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 <linux/bitmap.h>
+#include <linux/clocksource.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/irqchip/mips-gic.h>
+#include <linux/of_address.h>
+#include <linux/sched.h>
+#include <linux/smp.h>
+
+#include <asm/mips-cm.h>
+#include <asm/setup.h>
+#include <asm/traps.h>
+
+#include <dt-bindings/interrupt-controller/mips-gic.h>
+
+#include "irqchip.h"
+
+unsigned int gic_present;
+
+struct gic_pcpu_mask {
+ DECLARE_BITMAP(pcpu_mask, GIC_MAX_INTRS);
+};
+
+static void __iomem *gic_base;
+static struct gic_pcpu_mask pcpu_masks[NR_CPUS];
+static DEFINE_SPINLOCK(gic_lock);
+static struct irq_domain *gic_irq_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;
+
+static void __gic_irq_dispatch(void);
+
+static inline unsigned int gic_read(unsigned int reg)
+{
+ return __raw_readl(gic_base + reg);
+}
+
+static inline void gic_write(unsigned int reg, unsigned int val)
+{
+ __raw_writel(val, gic_base + reg);
+}
+
+static inline void gic_update_bits(unsigned int reg, unsigned int mask,
+ unsigned int val)
+{
+ unsigned int regval;
+
+ regval = gic_read(reg);
+ regval &= ~mask;
+ regval |= val;
+ gic_write(reg, regval);
+}
+
+static inline void gic_reset_mask(unsigned int intr)
+{
+ gic_write(GIC_REG(SHARED, GIC_SH_RMASK) + GIC_INTR_OFS(intr),
+ 1 << GIC_INTR_BIT(intr));
+}
+
+static inline void gic_set_mask(unsigned int intr)
+{
+ gic_write(GIC_REG(SHARED, GIC_SH_SMASK) + GIC_INTR_OFS(intr),
+ 1 << GIC_INTR_BIT(intr));
+}
+
+static inline void gic_set_polarity(unsigned int intr, unsigned int pol)
+{
+ gic_update_bits(GIC_REG(SHARED, GIC_SH_SET_POLARITY) +
+ GIC_INTR_OFS(intr), 1 << GIC_INTR_BIT(intr),
+ pol << GIC_INTR_BIT(intr));
+}
+
+static inline void gic_set_trigger(unsigned int intr, unsigned int trig)
+{
+ gic_update_bits(GIC_REG(SHARED, GIC_SH_SET_TRIGGER) +
+ GIC_INTR_OFS(intr), 1 << GIC_INTR_BIT(intr),
+ trig << GIC_INTR_BIT(intr));
+}
+
+static inline void gic_set_dual_edge(unsigned int intr, unsigned int dual)
+{
+ gic_update_bits(GIC_REG(SHARED, GIC_SH_SET_DUAL) + GIC_INTR_OFS(intr),
+ 1 << GIC_INTR_BIT(intr),
+ dual << GIC_INTR_BIT(intr));
+}
+
+static inline void gic_map_to_pin(unsigned int intr, unsigned int pin)
+{
+ gic_write(GIC_REG(SHARED, GIC_SH_INTR_MAP_TO_PIN_BASE) +
+ GIC_SH_MAP_TO_PIN(intr), GIC_MAP_TO_PIN_MSK | pin);
+}
+
+static inline void gic_map_to_vpe(unsigned int intr, unsigned int vpe)
+{
+ gic_write(GIC_REG(SHARED, GIC_SH_INTR_MAP_TO_VPE_BASE) +
+ GIC_SH_MAP_TO_VPE_REG_OFF(intr, vpe),
+ GIC_SH_MAP_TO_VPE_REG_BIT(vpe));
+}
+
+#ifdef CONFIG_CLKSRC_MIPS_GIC
+cycle_t gic_read_count(void)
+{
+ unsigned int hi, hi2, lo;
+
+ do {
+ hi = gic_read(GIC_REG(SHARED, GIC_SH_COUNTER_63_32));
+ lo = gic_read(GIC_REG(SHARED, GIC_SH_COUNTER_31_00));
+ hi2 = gic_read(GIC_REG(SHARED, GIC_SH_COUNTER_63_32));
+ } while (hi2 != hi);
+
+ return (((cycle_t) hi) << 32) + lo;
+}
+
+unsigned int gic_get_count_width(void)
+{
+ unsigned int bits, config;
+
+ config = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG));
+ bits = 32 + 4 * ((config & GIC_SH_CONFIG_COUNTBITS_MSK) >>
+ GIC_SH_CONFIG_COUNTBITS_SHF);
+
+ return bits;
+}
+
+void gic_write_compare(cycle_t cnt)
+{
+ gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_HI),
+ (int)(cnt >> 32));
+ gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_LO),
+ (int)(cnt & 0xffffffff));
+}
+
+void gic_write_cpu_compare(cycle_t cnt, int cpu)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+
+ gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), cpu);
+ gic_write(GIC_REG(VPE_OTHER, GIC_VPE_COMPARE_HI),
+ (int)(cnt >> 32));
+ gic_write(GIC_REG(VPE_OTHER, GIC_VPE_COMPARE_LO),
+ (int)(cnt & 0xffffffff));
+
+ local_irq_restore(flags);
+}
+
+cycle_t gic_read_compare(void)
+{
+ unsigned int hi, lo;
+
+ hi = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_HI));
+ lo = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_COMPARE_LO));
+
+ return (((cycle_t) hi) << 32) + lo;
+}
+
+void gic_start_count(void)
+{
+ u32 gicconfig;
+
+ /* Start the counter */
+ gicconfig = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG));
+ gicconfig &= ~(1 << GIC_SH_CONFIG_COUNTSTOP_SHF);
+ gic_write(GIC_REG(SHARED, GIC_SH_CONFIG), gicconfig);
+}
+
+void gic_stop_count(void)
+{
+ u32 gicconfig;
+
+ /* Stop the counter */
+ gicconfig = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG));
+ gicconfig |= 1 << GIC_SH_CONFIG_COUNTSTOP_SHF;
+ gic_write(GIC_REG(SHARED, GIC_SH_CONFIG), gicconfig);
+}
+
+#endif
+
+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 = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_CTL));
+ switch (intr) {
+ case GIC_LOCAL_INT_TIMER:
+ return vpe_ctl & GIC_VPE_CTL_TIMER_RTBL_MSK;
+ case GIC_LOCAL_INT_PERFCTR:
+ return vpe_ctl & GIC_VPE_CTL_PERFCNT_RTBL_MSK;
+ case GIC_LOCAL_INT_FDC:
+ return vpe_ctl & GIC_VPE_CTL_FDC_RTBL_MSK;
+ case GIC_LOCAL_INT_SWINT0:
+ case GIC_LOCAL_INT_SWINT1:
+ return vpe_ctl & GIC_VPE_CTL_SWINT_RTBL_MSK;
+ 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 */
+ gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_EIC_SHADOW_SET_BASE) +
+ GIC_VPE_EIC_SS(irq), set);
+}
+
+void gic_send_ipi(unsigned int intr)
+{
+ gic_write(GIC_REG(SHARED, GIC_SH_WEDGE), GIC_SH_WEDGE_SET(intr));
+}
+
+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;
+ }
+
+ /*
+ * Some cores claim the FDC is routable but it doesn't actually seem to
+ * be connected.
+ */
+ switch (current_cpu_type()) {
+ case CPU_INTERAPTIV:
+ case CPU_PROAPTIV:
+ return -1;
+ }
+
+ return irq_create_mapping(gic_irq_domain,
+ GIC_LOCAL_TO_HWIRQ(GIC_LOCAL_INT_FDC));
+}
+
+static void gic_handle_shared_int(bool chained)
+{
+ unsigned int i, intr, virq;
+ unsigned long *pcpu_mask;
+ unsigned long pending_reg, intrmask_reg;
+ 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;
+
+ pending_reg = GIC_REG(SHARED, GIC_SH_PEND);
+ intrmask_reg = GIC_REG(SHARED, GIC_SH_MASK);
+
+ for (i = 0; i < BITS_TO_LONGS(gic_shared_intrs); i++) {
+ pending[i] = gic_read(pending_reg);
+ intrmask[i] = gic_read(intrmask_reg);
+ pending_reg += 0x4;
+ intrmask_reg += 0x4;
+ }
+
+ bitmap_and(pending, pending, intrmask, gic_shared_intrs);
+ bitmap_and(pending, pending, pcpu_mask, gic_shared_intrs);
+
+ intr = find_first_bit(pending, gic_shared_intrs);
+ while (intr != 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);
+
+ /* go to next pending bit */
+ bitmap_clear(pending, intr, 1);
+ intr = find_first_bit(pending, gic_shared_intrs);
+ }
+}
+
+static void gic_mask_irq(struct irq_data *d)
+{
+ gic_reset_mask(GIC_HWIRQ_TO_SHARED(d->hwirq));
+}
+
+static void gic_unmask_irq(struct irq_data *d)
+{
+ gic_set_mask(GIC_HWIRQ_TO_SHARED(d->hwirq));
+}
+
+static void gic_ack_irq(struct irq_data *d)
+{
+ unsigned int irq = GIC_HWIRQ_TO_SHARED(d->hwirq);
+
+ gic_write(GIC_REG(SHARED, GIC_SH_WEDGE), GIC_SH_WEDGE_CLR(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:
+ gic_set_polarity(irq, GIC_POL_NEG);
+ gic_set_trigger(irq, GIC_TRIG_EDGE);
+ gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE);
+ is_edge = true;
+ break;
+ case IRQ_TYPE_EDGE_RISING:
+ gic_set_polarity(irq, GIC_POL_POS);
+ gic_set_trigger(irq, GIC_TRIG_EDGE);
+ gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE);
+ is_edge = true;
+ break;
+ case IRQ_TYPE_EDGE_BOTH:
+ /* polarity is irrelevant in this case */
+ gic_set_trigger(irq, GIC_TRIG_EDGE);
+ gic_set_dual_edge(irq, GIC_TRIG_DUAL_ENABLE);
+ is_edge = true;
+ break;
+ case IRQ_TYPE_LEVEL_LOW:
+ gic_set_polarity(irq, GIC_POL_NEG);
+ gic_set_trigger(irq, GIC_TRIG_LEVEL);
+ gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE);
+ is_edge = false;
+ break;
+ case IRQ_TYPE_LEVEL_HIGH:
+ default:
+ gic_set_polarity(irq, GIC_POL_POS);
+ gic_set_trigger(irq, GIC_TRIG_LEVEL);
+ gic_set_dual_edge(irq, GIC_TRIG_DUAL_DISABLE);
+ is_edge = false;
+ break;
+ }
+
+ if (is_edge) {
+ __irq_set_chip_handler_name_locked(d->irq,
+ &gic_edge_irq_controller,
+ handle_edge_irq, NULL);
+ } else {
+ __irq_set_chip_handler_name_locked(d->irq,
+ &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 */
+ gic_map_to_vpe(irq, cpumask_first(&tmp));
+
+ /* Update the pcpu_masks */
+ for (i = 0; i < NR_CPUS; i++)
+ clear_bit(irq, pcpu_masks[i].pcpu_mask);
+ set_bit(irq, pcpu_masks[cpumask_first(&tmp)].pcpu_mask);
+
+ cpumask_copy(d->affinity, 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
+};
+
+static void gic_handle_local_int(bool chained)
+{
+ unsigned long pending, masked;
+ unsigned int intr, virq;
+
+ pending = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_PEND));
+ masked = gic_read(GIC_REG(VPE_LOCAL, GIC_VPE_MASK));
+
+ bitmap_and(&pending, &pending, &masked, GIC_NUM_LOCAL_INTRS);
+
+ intr = find_first_bit(&pending, GIC_NUM_LOCAL_INTRS);
+ while (intr != 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);
+
+ /* go to next pending bit */
+ bitmap_clear(&pending, intr, 1);
+ intr = find_first_bit(&pending, GIC_NUM_LOCAL_INTRS);
+ }
+}
+
+static void gic_mask_local_irq(struct irq_data *d)
+{
+ int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq);
+
+ gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_RMASK), 1 << intr);
+}
+
+static void gic_unmask_local_irq(struct irq_data *d)
+{
+ int intr = GIC_HWIRQ_TO_LOCAL(d->hwirq);
+
+ gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_SMASK), 1 << 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++) {
+ gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i);
+ gic_write(GIC_REG(VPE_OTHER, GIC_VPE_RMASK), 1 << 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++) {
+ gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i);
+ gic_write(GIC_REG(VPE_OTHER, GIC_VPE_SMASK), 1 << 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(unsigned int irq, struct irq_desc *desc)
+{
+ gic_handle_local_int(true);
+ gic_handle_shared_int(true);
+}
+
+#ifdef CONFIG_MIPS_GIC_IPI
+static int gic_resched_int_base;
+static int gic_call_int_base;
+
+unsigned int plat_ipi_resched_int_xlate(unsigned int cpu)
+{
+ return gic_resched_int_base + cpu;
+}
+
+unsigned int plat_ipi_call_int_xlate(unsigned int cpu)
+{
+ return gic_call_int_base + cpu;
+}
+
+static irqreturn_t ipi_resched_interrupt(int irq, void *dev_id)
+{
+ scheduler_ipi();
+
+ return IRQ_HANDLED;
+}
+
+static irqreturn_t ipi_call_interrupt(int irq, void *dev_id)
+{
+ smp_call_function_interrupt();
+
+ return IRQ_HANDLED;
+}
+
+static struct irqaction irq_resched = {
+ .handler = ipi_resched_interrupt,
+ .flags = IRQF_PERCPU,
+ .name = "IPI resched"
+};
+
+static struct irqaction irq_call = {
+ .handler = ipi_call_interrupt,
+ .flags = IRQF_PERCPU,
+ .name = "IPI call"
+};
+
+static __init void gic_ipi_init_one(unsigned int intr, int cpu,
+ struct irqaction *action)
+{
+ int virq = irq_create_mapping(gic_irq_domain,
+ GIC_SHARED_TO_HWIRQ(intr));
+ int i;
+
+ gic_map_to_vpe(intr, cpu);
+ for (i = 0; i < NR_CPUS; i++)
+ clear_bit(intr, pcpu_masks[i].pcpu_mask);
+ set_bit(intr, pcpu_masks[cpu].pcpu_mask);
+
+ irq_set_irq_type(virq, IRQ_TYPE_EDGE_RISING);
+
+ irq_set_handler(virq, handle_percpu_irq);
+ setup_irq(virq, action);
+}
+
+static __init void gic_ipi_init(void)
+{
+ int i;
+
+ /* Use last 2 * NR_CPUS interrupts as IPIs */
+ gic_resched_int_base = gic_shared_intrs - nr_cpu_ids;
+ gic_call_int_base = gic_resched_int_base - nr_cpu_ids;
+
+ for (i = 0; i < nr_cpu_ids; i++) {
+ gic_ipi_init_one(gic_call_int_base + i, i, &irq_call);
+ gic_ipi_init_one(gic_resched_int_base + i, i, &irq_resched);
+ }
+}
+#else
+static inline void gic_ipi_init(void)
+{
+}
+#endif
+
+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++) {
+ gic_set_polarity(i, GIC_POL_POS);
+ gic_set_trigger(i, GIC_TRIG_LEVEL);
+ gic_reset_mask(i);
+ }
+
+ for (i = 0; i < gic_vpes; i++) {
+ unsigned int j;
+
+ gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i);
+ for (j = 0; j < GIC_NUM_LOCAL_INTRS; j++) {
+ if (!gic_local_irq_is_routable(j))
+ continue;
+ gic_write(GIC_REG(VPE_OTHER, GIC_VPE_RMASK), 1 << 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 ret = 0;
+ int i;
+ unsigned long flags;
+
+ if (!gic_local_irq_is_routable(intr))
+ return -EPERM;
+
+ /*
+ * HACK: These are all really percpu interrupts, but the rest
+ * of the MIPS kernel code does not use the percpu IRQ API for
+ * the CP0 timer and performance counter interrupts.
+ */
+ switch (intr) {
+ case GIC_LOCAL_INT_TIMER:
+ case GIC_LOCAL_INT_PERFCTR:
+ case GIC_LOCAL_INT_FDC:
+ irq_set_chip_and_handler(virq,
+ &gic_all_vpes_local_irq_controller,
+ handle_percpu_irq);
+ break;
+ default:
+ irq_set_chip_and_handler(virq,
+ &gic_local_irq_controller,
+ handle_percpu_devid_irq);
+ irq_set_percpu_devid(virq);
+ break;
+ }
+
+ spin_lock_irqsave(&gic_lock, flags);
+ for (i = 0; i < gic_vpes; i++) {
+ u32 val = GIC_MAP_TO_PIN_MSK | gic_cpu_pin;
+
+ gic_write(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i);
+
+ switch (intr) {
+ case GIC_LOCAL_INT_WD:
+ gic_write(GIC_REG(VPE_OTHER, GIC_VPE_WD_MAP), val);
+ break;
+ case GIC_LOCAL_INT_COMPARE:
+ gic_write(GIC_REG(VPE_OTHER, GIC_VPE_COMPARE_MAP), val);
+ break;
+ case GIC_LOCAL_INT_TIMER:
+ /* CONFIG_MIPS_CMP workaround (see __gic_init) */
+ val = GIC_MAP_TO_PIN_MSK | timer_cpu_pin;
+ gic_write(GIC_REG(VPE_OTHER, GIC_VPE_TIMER_MAP), val);
+ break;
+ case GIC_LOCAL_INT_PERFCTR:
+ gic_write(GIC_REG(VPE_OTHER, GIC_VPE_PERFCTR_MAP), val);
+ break;
+ case GIC_LOCAL_INT_SWINT0:
+ gic_write(GIC_REG(VPE_OTHER, GIC_VPE_SWINT0_MAP), val);
+ break;
+ case GIC_LOCAL_INT_SWINT1:
+ gic_write(GIC_REG(VPE_OTHER, GIC_VPE_SWINT1_MAP), val);
+ break;
+ case GIC_LOCAL_INT_FDC:
+ gic_write(GIC_REG(VPE_OTHER, GIC_VPE_FDC_MAP), val);
+ break;
+ default:
+ pr_err("Invalid local IRQ %d\n", intr);
+ ret = -EINVAL;
+ break;
+ }
+ }
+ spin_unlock_irqrestore(&gic_lock, flags);
+
+ return ret;
+}
+
+static int gic_shared_irq_domain_map(struct irq_domain *d, unsigned int virq,
+ irq_hw_number_t hw)
+{
+ int intr = GIC_HWIRQ_TO_SHARED(hw);
+ unsigned long flags;
+
+ irq_set_chip_and_handler(virq, &gic_level_irq_controller,
+ handle_level_irq);
+
+ spin_lock_irqsave(&gic_lock, flags);
+ gic_map_to_pin(intr, gic_cpu_pin);
+ /* Map to VPE 0 by default */
+ gic_map_to_vpe(intr, 0);
+ set_bit(intr, pcpu_masks[0].pcpu_mask);
+ spin_unlock_irqrestore(&gic_lock, flags);
+
+ return 0;
+}
+
+static int gic_irq_domain_map(struct irq_domain *d, unsigned int virq,
+ irq_hw_number_t hw)
+{
+ if (GIC_HWIRQ_TO_LOCAL(hw) < GIC_NUM_LOCAL_INTRS)
+ return gic_local_irq_domain_map(d, virq, hw);
+ return gic_shared_irq_domain_map(d, virq, hw);
+}
+
+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 struct irq_domain_ops gic_irq_domain_ops = {
+ .map = gic_irq_domain_map,
+ .xlate = gic_irq_domain_xlate,
+};
+
+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;
+
+ gic_base = ioremap_nocache(gic_base_addr, gic_addrspace_size);
+
+ gicconfig = gic_read(GIC_REG(SHARED, GIC_SH_CONFIG));
+ gic_shared_intrs = (gicconfig & GIC_SH_CONFIG_NUMINTRS_MSK) >>
+ GIC_SH_CONFIG_NUMINTRS_SHF;
+ gic_shared_intrs = ((gic_shared_intrs + 1) * 8);
+
+ gic_vpes = (gicconfig & GIC_SH_CONFIG_NUMVPES_MSK) >>
+ GIC_SH_CONFIG_NUMVPES_SHF;
+ gic_vpes = gic_vpes + 1;
+
+ if (cpu_has_veic) {
+ /* 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 = gic_read(GIC_REG(VPE_LOCAL,
+ GIC_VPE_TIMER_MAP)) &
+ GIC_MAP_MSK;
+ 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_basic_init();
+
+ gic_ipi_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_MSK;
+ 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_MSK);
+ gic_present = true;
+
+ __gic_init(gic_base, gic_len, cpu_vec, 0, node);
+
+ return 0;
+}
+IRQCHIP_DECLARE(mips_gic, "mti,gic", gic_of_init);