drivers/irqchip/irq-mips-gic.c - kernel/msm-4.19 - Gitiles

 /*
  * 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(void)
 {
 	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));
 		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(void)
 {
 	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));
 		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();
 	gic_handle_shared_int();
 }

 static void gic_irq_dispatch(unsigned int irq, struct irq_desc *desc)
 {
 	__gic_irq_dispatch();
 }

 #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);
	/*
	* 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(void)
	{
	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));
	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(void)
	{
	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));
	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();
	gic_handle_shared_int();
	}

	static void gic_irq_dispatch(unsigned int irq, struct irq_desc *desc)
	{
	__gic_irq_dispatch();
	}

	#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);