drivers/irqchip/irq-hip04.c - kernel/bruno - Git at Google

 /*
  * Hisilicon HiP04 INTC
  *
  * Copyright (C) 2002-2014 ARM Limited.
  * Copyright (c) 2013-2014 Hisilicon Ltd.
  * Copyright (c) 2013-2014 Linaro Ltd.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  *
  * Interrupt architecture for the HIP04 INTC:
  *
  * o There is one Interrupt Distributor, which receives interrupts
  *   from system devices and sends them to the Interrupt Controllers.
  *
  * o There is one CPU Interface per CPU, which sends interrupts sent
  *   by the Distributor, and interrupts generated locally, to the
  *   associated CPU. The base address of the CPU interface is usually
  *   aliased so that the same address points to different chips depending
  *   on the CPU it is accessed from.
  *
  * Note that IRQs 0-31 are special - they are local to each CPU.
  * As such, the enable set/clear, pending set/clear and active bit
  * registers are banked per-cpu for these sources.
  */

 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/err.h>
 #include <linux/module.h>
 #include <linux/list.h>
 #include <linux/smp.h>
 #include <linux/cpu.h>
 #include <linux/cpu_pm.h>
 #include <linux/cpumask.h>
 #include <linux/io.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
 #include <linux/irqdomain.h>
 #include <linux/interrupt.h>
 #include <linux/slab.h>
 #include <linux/irqchip.h>
 #include <linux/irqchip/arm-gic.h>

 #include <asm/irq.h>
 #include <asm/exception.h>
 #include <asm/smp_plat.h>

 #include "irq-gic-common.h"

 #define HIP04_MAX_IRQS		510

 struct hip04_irq_data {
 	void __iomem *dist_base;
 	void __iomem *cpu_base;
 	struct irq_domain *domain;
 	unsigned int nr_irqs;
 };

 static DEFINE_RAW_SPINLOCK(irq_controller_lock);

 /*
  * The GIC mapping of CPU interfaces does not necessarily match
  * the logical CPU numbering.  Let's use a mapping as returned
  * by the GIC itself.
  */
 #define NR_HIP04_CPU_IF 16
 static u16 hip04_cpu_map[NR_HIP04_CPU_IF] __read_mostly;

 static struct hip04_irq_data hip04_data __read_mostly;

 static inline void __iomem *hip04_dist_base(struct irq_data *d)
 {
 	struct hip04_irq_data *hip04_data = irq_data_get_irq_chip_data(d);
 	return hip04_data->dist_base;
 }

 static inline void __iomem *hip04_cpu_base(struct irq_data *d)
 {
 	struct hip04_irq_data *hip04_data = irq_data_get_irq_chip_data(d);
 	return hip04_data->cpu_base;
 }

 static inline unsigned int hip04_irq(struct irq_data *d)
 {
 	return d->hwirq;
 }

 /*
  * Routines to acknowledge, disable and enable interrupts
  */
 static void hip04_mask_irq(struct irq_data *d)
 {
 	u32 mask = 1 << (hip04_irq(d) % 32);

 	raw_spin_lock(&irq_controller_lock);
 	writel_relaxed(mask, hip04_dist_base(d) + GIC_DIST_ENABLE_CLEAR +
 		       (hip04_irq(d) / 32) * 4);
 	raw_spin_unlock(&irq_controller_lock);
 }

 static void hip04_unmask_irq(struct irq_data *d)
 {
 	u32 mask = 1 << (hip04_irq(d) % 32);

 	raw_spin_lock(&irq_controller_lock);
 	writel_relaxed(mask, hip04_dist_base(d) + GIC_DIST_ENABLE_SET +
 		       (hip04_irq(d) / 32) * 4);
 	raw_spin_unlock(&irq_controller_lock);
 }

 static void hip04_eoi_irq(struct irq_data *d)
 {
 	writel_relaxed(hip04_irq(d), hip04_cpu_base(d) + GIC_CPU_EOI);
 }

 static int hip04_irq_set_type(struct irq_data *d, unsigned int type)
 {
 	void __iomem *base = hip04_dist_base(d);
 	unsigned int irq = hip04_irq(d);
 	int ret;

 	/* Interrupt configuration for SGIs can't be changed */
 	if (irq < 16)
 		return -EINVAL;

 	/* SPIs have restrictions on the supported types */
 	if (irq >= 32 && type != IRQ_TYPE_LEVEL_HIGH &&
 			 type != IRQ_TYPE_EDGE_RISING)
 		return -EINVAL;

 	raw_spin_lock(&irq_controller_lock);

 	ret = gic_configure_irq(irq, type, base, NULL);

 	raw_spin_unlock(&irq_controller_lock);

 	return ret;
 }

 #ifdef CONFIG_SMP
 static int hip04_irq_set_affinity(struct irq_data *d,
 				  const struct cpumask *mask_val,
 				  bool force)
 {
 	void __iomem *reg;
 	unsigned int cpu, shift = (hip04_irq(d) % 2) * 16;
 	u32 val, mask, bit;

 	if (!force)
 		cpu = cpumask_any_and(mask_val, cpu_online_mask);
 	else
 		cpu = cpumask_first(mask_val);

 	if (cpu >= NR_HIP04_CPU_IF || cpu >= nr_cpu_ids)
 		return -EINVAL;

 	raw_spin_lock(&irq_controller_lock);
 	reg = hip04_dist_base(d) + GIC_DIST_TARGET + ((hip04_irq(d) * 2) & ~3);
 	mask = 0xffff << shift;
 	bit = hip04_cpu_map[cpu] << shift;
 	val = readl_relaxed(reg) & ~mask;
 	writel_relaxed(val | bit, reg);
 	raw_spin_unlock(&irq_controller_lock);

 	return IRQ_SET_MASK_OK;
 }
 #endif

 static void __exception_irq_entry hip04_handle_irq(struct pt_regs *regs)
 {
 	u32 irqstat, irqnr;
 	void __iomem *cpu_base = hip04_data.cpu_base;

 	do {
 		irqstat = readl_relaxed(cpu_base + GIC_CPU_INTACK);
 		irqnr = irqstat & GICC_IAR_INT_ID_MASK;

 		if (likely(irqnr > 15 && irqnr <= HIP04_MAX_IRQS)) {
 			handle_domain_irq(hip04_data.domain, irqnr, regs);
 			continue;
 		}
 		if (irqnr < 16) {
 			writel_relaxed(irqstat, cpu_base + GIC_CPU_EOI);
 #ifdef CONFIG_SMP
 			handle_IPI(irqnr, regs);
 #endif
 			continue;
 		}
 		break;
 	} while (1);
 }

 static struct irq_chip hip04_irq_chip = {
 	.name			= "HIP04 INTC",
 	.irq_mask		= hip04_mask_irq,
 	.irq_unmask		= hip04_unmask_irq,
 	.irq_eoi		= hip04_eoi_irq,
 	.irq_set_type		= hip04_irq_set_type,
 #ifdef CONFIG_SMP
 	.irq_set_affinity	= hip04_irq_set_affinity,
 #endif
 	.flags			= IRQCHIP_SET_TYPE_MASKED |
 				  IRQCHIP_SKIP_SET_WAKE |
 				  IRQCHIP_MASK_ON_SUSPEND,
 };

 static u16 hip04_get_cpumask(struct hip04_irq_data *intc)
 {
 	void __iomem *base = intc->dist_base;
 	u32 mask, i;

 	for (i = mask = 0; i < 32; i += 2) {
 		mask = readl_relaxed(base + GIC_DIST_TARGET + i * 2);
 		mask |= mask >> 16;
 		if (mask)
 			break;
 	}

 	if (!mask)
 		pr_crit("GIC CPU mask not found - kernel will fail to boot.\n");

 	return mask;
 }

 static void __init hip04_irq_dist_init(struct hip04_irq_data *intc)
 {
 	unsigned int i;
 	u32 cpumask;
 	unsigned int nr_irqs = intc->nr_irqs;
 	void __iomem *base = intc->dist_base;

 	writel_relaxed(0, base + GIC_DIST_CTRL);

 	/*
 	 * Set all global interrupts to this CPU only.
 	 */
 	cpumask = hip04_get_cpumask(intc);
 	cpumask |= cpumask << 16;
 	for (i = 32; i < nr_irqs; i += 2)
 		writel_relaxed(cpumask, base + GIC_DIST_TARGET + ((i * 2) & ~3));

 	gic_dist_config(base, nr_irqs, NULL);

 	writel_relaxed(1, base + GIC_DIST_CTRL);
 }

 static void hip04_irq_cpu_init(struct hip04_irq_data *intc)
 {
 	void __iomem *dist_base = intc->dist_base;
 	void __iomem *base = intc->cpu_base;
 	unsigned int cpu_mask, cpu = smp_processor_id();
 	int i;

 	/*
 	 * Get what the GIC says our CPU mask is.
 	 */
 	BUG_ON(cpu >= NR_HIP04_CPU_IF);
 	cpu_mask = hip04_get_cpumask(intc);
 	hip04_cpu_map[cpu] = cpu_mask;

 	/*
 	 * Clear our mask from the other map entries in case they're
 	 * still undefined.
 	 */
 	for (i = 0; i < NR_HIP04_CPU_IF; i++)
 		if (i != cpu)
 			hip04_cpu_map[i] &= ~cpu_mask;

 	gic_cpu_config(dist_base, NULL);

 	writel_relaxed(0xf0, base + GIC_CPU_PRIMASK);
 	writel_relaxed(1, base + GIC_CPU_CTRL);
 }

 #ifdef CONFIG_SMP
 static void hip04_raise_softirq(const struct cpumask *mask, unsigned int irq)
 {
 	int cpu;
 	unsigned long flags, map = 0;

 	raw_spin_lock_irqsave(&irq_controller_lock, flags);

 	/* Convert our logical CPU mask into a physical one. */
 	for_each_cpu(cpu, mask)
 		map |= hip04_cpu_map[cpu];

 	/*
 	 * Ensure that stores to Normal memory are visible to the
 	 * other CPUs before they observe us issuing the IPI.
 	 */
 	dmb(ishst);

 	/* this always happens on GIC0 */
 	writel_relaxed(map << 8 | irq, hip04_data.dist_base + GIC_DIST_SOFTINT);

 	raw_spin_unlock_irqrestore(&irq_controller_lock, flags);
 }
 #endif

 static int hip04_irq_domain_map(struct irq_domain *d, unsigned int irq,
 				irq_hw_number_t hw)
 {
 	if (hw < 32) {
 		irq_set_percpu_devid(irq);
 		irq_set_chip_and_handler(irq, &hip04_irq_chip,
 					 handle_percpu_devid_irq);
 		irq_set_status_flags(irq, IRQ_NOAUTOEN);
 	} else {
 		irq_set_chip_and_handler(irq, &hip04_irq_chip,
 					 handle_fasteoi_irq);
 		irq_set_probe(irq);
 	}
 	irq_set_chip_data(irq, d->host_data);
 	return 0;
 }

 static int hip04_irq_domain_xlate(struct irq_domain *d,
 				  struct device_node *controller,
 				  const u32 *intspec, unsigned int intsize,
 				  unsigned long *out_hwirq,
 				  unsigned int *out_type)
 {
 	unsigned long ret = 0;

 	if (irq_domain_get_of_node(d) != controller)
 		return -EINVAL;
 	if (intsize < 3)
 		return -EINVAL;

 	/* Get the interrupt number and add 16 to skip over SGIs */
 	*out_hwirq = intspec[1] + 16;

 	/* For SPIs, we need to add 16 more to get the irq ID number */
 	if (!intspec[0])
 		*out_hwirq += 16;

 	*out_type = intspec[2] & IRQ_TYPE_SENSE_MASK;

 	return ret;
 }

 #ifdef CONFIG_SMP
 static int hip04_irq_secondary_init(struct notifier_block *nfb,
 				    unsigned long action,
 				    void *hcpu)
 {
 	if (action == CPU_STARTING || action == CPU_STARTING_FROZEN)
 		hip04_irq_cpu_init(&hip04_data);
 	return NOTIFY_OK;
 }

 /*
  * Notifier for enabling the INTC CPU interface. Set an arbitrarily high
  * priority because the GIC needs to be up before the ARM generic timers.
  */
 static struct notifier_block hip04_irq_cpu_notifier = {
 	.notifier_call	= hip04_irq_secondary_init,
 	.priority	= 100,
 };
 #endif

 static const struct irq_domain_ops hip04_irq_domain_ops = {
 	.map	= hip04_irq_domain_map,
 	.xlate	= hip04_irq_domain_xlate,
 };

 static int __init
 hip04_of_init(struct device_node *node, struct device_node *parent)
 {
 	irq_hw_number_t hwirq_base = 16;
 	int nr_irqs, irq_base, i;

 	if (WARN_ON(!node))
 		return -ENODEV;

 	hip04_data.dist_base = of_iomap(node, 0);
 	WARN(!hip04_data.dist_base, "fail to map hip04 intc dist registers\n");

 	hip04_data.cpu_base = of_iomap(node, 1);
 	WARN(!hip04_data.cpu_base, "unable to map hip04 intc cpu registers\n");

 	/*
 	 * Initialize the CPU interface map to all CPUs.
 	 * It will be refined as each CPU probes its ID.
 	 */
 	for (i = 0; i < NR_HIP04_CPU_IF; i++)
 		hip04_cpu_map[i] = 0xffff;

 	/*
 	 * Find out how many interrupts are supported.
 	 * The HIP04 INTC only supports up to 510 interrupt sources.
 	 */
 	nr_irqs = readl_relaxed(hip04_data.dist_base + GIC_DIST_CTR) & 0x1f;
 	nr_irqs = (nr_irqs + 1) * 32;
 	if (nr_irqs > HIP04_MAX_IRQS)
 		nr_irqs = HIP04_MAX_IRQS;
 	hip04_data.nr_irqs = nr_irqs;

 	nr_irqs -= hwirq_base; /* calculate # of irqs to allocate */

 	irq_base = irq_alloc_descs(-1, hwirq_base, nr_irqs, numa_node_id());
 	if (IS_ERR_VALUE(irq_base)) {
 		pr_err("failed to allocate IRQ numbers\n");
 		return -EINVAL;
 	}

 	hip04_data.domain = irq_domain_add_legacy(node, nr_irqs, irq_base,
 						  hwirq_base,
 						  &hip04_irq_domain_ops,
 						  &hip04_data);

 	if (WARN_ON(!hip04_data.domain))
 		return -EINVAL;

 #ifdef CONFIG_SMP
 	set_smp_cross_call(hip04_raise_softirq);
 	register_cpu_notifier(&hip04_irq_cpu_notifier);
 #endif
 	set_handle_irq(hip04_handle_irq);

 	hip04_irq_dist_init(&hip04_data);
 	hip04_irq_cpu_init(&hip04_data);

 	return 0;
 }
 IRQCHIP_DECLARE(hip04_intc, "hisilicon,hip04-intc", hip04_of_init);
	/*
	* Hisilicon HiP04 INTC
	*
	* Copyright (C) 2002-2014 ARM Limited.
	* Copyright (c) 2013-2014 Hisilicon Ltd.
	* Copyright (c) 2013-2014 Linaro Ltd.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*
	* Interrupt architecture for the HIP04 INTC:
	*
	* o There is one Interrupt Distributor, which receives interrupts
	* from system devices and sends them to the Interrupt Controllers.
	*
	* o There is one CPU Interface per CPU, which sends interrupts sent
	* by the Distributor, and interrupts generated locally, to the
	* associated CPU. The base address of the CPU interface is usually
	* aliased so that the same address points to different chips depending
	* on the CPU it is accessed from.
	*
	* Note that IRQs 0-31 are special - they are local to each CPU.
	* As such, the enable set/clear, pending set/clear and active bit
	* registers are banked per-cpu for these sources.
	*/

	#include <linux/init.h>
	#include <linux/kernel.h>
	#include <linux/err.h>
	#include <linux/module.h>
	#include <linux/list.h>
	#include <linux/smp.h>
	#include <linux/cpu.h>
	#include <linux/cpu_pm.h>
	#include <linux/cpumask.h>
	#include <linux/io.h>
	#include <linux/of.h>
	#include <linux/of_address.h>
	#include <linux/of_irq.h>
	#include <linux/irqdomain.h>
	#include <linux/interrupt.h>
	#include <linux/slab.h>
	#include <linux/irqchip.h>
	#include <linux/irqchip/arm-gic.h>

	#include <asm/irq.h>
	#include <asm/exception.h>
	#include <asm/smp_plat.h>

	#include "irq-gic-common.h"

	#define HIP04_MAX_IRQS 510

	struct hip04_irq_data {
	void __iomem *dist_base;
	void __iomem *cpu_base;
	struct irq_domain *domain;
	unsigned int nr_irqs;
	};

	static DEFINE_RAW_SPINLOCK(irq_controller_lock);

	/*
	* The GIC mapping of CPU interfaces does not necessarily match
	* the logical CPU numbering. Let's use a mapping as returned
	* by the GIC itself.
	*/
	#define NR_HIP04_CPU_IF 16
	static u16 hip04_cpu_map[NR_HIP04_CPU_IF] __read_mostly;

	static struct hip04_irq_data hip04_data __read_mostly;

	static inline void __iomem hip04_dist_base(struct irq_data d)
	{
	struct hip04_irq_data *hip04_data = irq_data_get_irq_chip_data(d);
	return hip04_data->dist_base;
	}

	static inline void __iomem hip04_cpu_base(struct irq_data d)
	{
	struct hip04_irq_data *hip04_data = irq_data_get_irq_chip_data(d);
	return hip04_data->cpu_base;
	}

	static inline unsigned int hip04_irq(struct irq_data *d)
	{
	return d->hwirq;
	}

	/*
	* Routines to acknowledge, disable and enable interrupts
	*/
	static void hip04_mask_irq(struct irq_data *d)
	{
	u32 mask = 1 << (hip04_irq(d) % 32);

	raw_spin_lock(&irq_controller_lock);
	writel_relaxed(mask, hip04_dist_base(d) + GIC_DIST_ENABLE_CLEAR +
	(hip04_irq(d) / 32) * 4);
	raw_spin_unlock(&irq_controller_lock);
	}

	static void hip04_unmask_irq(struct irq_data *d)
	{
	u32 mask = 1 << (hip04_irq(d) % 32);

	raw_spin_lock(&irq_controller_lock);
	writel_relaxed(mask, hip04_dist_base(d) + GIC_DIST_ENABLE_SET +
	(hip04_irq(d) / 32) * 4);
	raw_spin_unlock(&irq_controller_lock);
	}

	static void hip04_eoi_irq(struct irq_data *d)
	{
	writel_relaxed(hip04_irq(d), hip04_cpu_base(d) + GIC_CPU_EOI);
	}

	static int hip04_irq_set_type(struct irq_data *d, unsigned int type)
	{
	void __iomem *base = hip04_dist_base(d);
	unsigned int irq = hip04_irq(d);
	int ret;

	/* Interrupt configuration for SGIs can't be changed */
	if (irq < 16)
	return -EINVAL;

	/* SPIs have restrictions on the supported types */
	if (irq >= 32 && type != IRQ_TYPE_LEVEL_HIGH &&
	type != IRQ_TYPE_EDGE_RISING)
	return -EINVAL;

	raw_spin_lock(&irq_controller_lock);

	ret = gic_configure_irq(irq, type, base, NULL);

	raw_spin_unlock(&irq_controller_lock);

	return ret;
	}

	#ifdef CONFIG_SMP
	static int hip04_irq_set_affinity(struct irq_data *d,
	const struct cpumask *mask_val,
	bool force)
	{
	void __iomem *reg;
	unsigned int cpu, shift = (hip04_irq(d) % 2) * 16;
	u32 val, mask, bit;

	if (!force)
	cpu = cpumask_any_and(mask_val, cpu_online_mask);
	else
	cpu = cpumask_first(mask_val);

	if (cpu >= NR_HIP04_CPU_IF \|\| cpu >= nr_cpu_ids)
	return -EINVAL;

	raw_spin_lock(&irq_controller_lock);
	reg = hip04_dist_base(d) + GIC_DIST_TARGET + ((hip04_irq(d) * 2) & ~3);
	mask = 0xffff << shift;
	bit = hip04_cpu_map[cpu] << shift;
	val = readl_relaxed(reg) & ~mask;
	writel_relaxed(val \| bit, reg);
	raw_spin_unlock(&irq_controller_lock);

	return IRQ_SET_MASK_OK;
	}
	#endif

	static void __exception_irq_entry hip04_handle_irq(struct pt_regs *regs)
	{
	u32 irqstat, irqnr;
	void __iomem *cpu_base = hip04_data.cpu_base;

	do {
	irqstat = readl_relaxed(cpu_base + GIC_CPU_INTACK);
	irqnr = irqstat & GICC_IAR_INT_ID_MASK;

	if (likely(irqnr > 15 && irqnr <= HIP04_MAX_IRQS)) {
	handle_domain_irq(hip04_data.domain, irqnr, regs);
	continue;
	}
	if (irqnr < 16) {
	writel_relaxed(irqstat, cpu_base + GIC_CPU_EOI);
	#ifdef CONFIG_SMP
	handle_IPI(irqnr, regs);
	#endif
	continue;
	}
	break;
	} while (1);
	}

	static struct irq_chip hip04_irq_chip = {
	.name = "HIP04 INTC",
	.irq_mask = hip04_mask_irq,
	.irq_unmask = hip04_unmask_irq,
	.irq_eoi = hip04_eoi_irq,
	.irq_set_type = hip04_irq_set_type,
	#ifdef CONFIG_SMP
	.irq_set_affinity = hip04_irq_set_affinity,
	#endif
	.flags = IRQCHIP_SET_TYPE_MASKED \|
	IRQCHIP_SKIP_SET_WAKE \|
	IRQCHIP_MASK_ON_SUSPEND,
	};

	static u16 hip04_get_cpumask(struct hip04_irq_data *intc)
	{
	void __iomem *base = intc->dist_base;
	u32 mask, i;

	for (i = mask = 0; i < 32; i += 2) {
	mask = readl_relaxed(base + GIC_DIST_TARGET + i * 2);
	mask \|= mask >> 16;
	if (mask)
	break;
	}

	if (!mask)
	pr_crit("GIC CPU mask not found - kernel will fail to boot.\n");

	return mask;
	}

	static void __init hip04_irq_dist_init(struct hip04_irq_data *intc)
	{
	unsigned int i;
	u32 cpumask;
	unsigned int nr_irqs = intc->nr_irqs;
	void __iomem *base = intc->dist_base;

	writel_relaxed(0, base + GIC_DIST_CTRL);

	/*
	* Set all global interrupts to this CPU only.
	*/
	cpumask = hip04_get_cpumask(intc);
	cpumask \|= cpumask << 16;
	for (i = 32; i < nr_irqs; i += 2)
	writel_relaxed(cpumask, base + GIC_DIST_TARGET + ((i * 2) & ~3));

	gic_dist_config(base, nr_irqs, NULL);

	writel_relaxed(1, base + GIC_DIST_CTRL);
	}

	static void hip04_irq_cpu_init(struct hip04_irq_data *intc)
	{
	void __iomem *dist_base = intc->dist_base;
	void __iomem *base = intc->cpu_base;
	unsigned int cpu_mask, cpu = smp_processor_id();
	int i;

	/*
	* Get what the GIC says our CPU mask is.
	*/
	BUG_ON(cpu >= NR_HIP04_CPU_IF);
	cpu_mask = hip04_get_cpumask(intc);
	hip04_cpu_map[cpu] = cpu_mask;

	/*
	* Clear our mask from the other map entries in case they're
	* still undefined.
	*/
	for (i = 0; i < NR_HIP04_CPU_IF; i++)
	if (i != cpu)
	hip04_cpu_map[i] &= ~cpu_mask;

	gic_cpu_config(dist_base, NULL);

	writel_relaxed(0xf0, base + GIC_CPU_PRIMASK);
	writel_relaxed(1, base + GIC_CPU_CTRL);
	}

	#ifdef CONFIG_SMP
	static void hip04_raise_softirq(const struct cpumask *mask, unsigned int irq)
	{
	int cpu;
	unsigned long flags, map = 0;

	raw_spin_lock_irqsave(&irq_controller_lock, flags);

	/* Convert our logical CPU mask into a physical one. */
	for_each_cpu(cpu, mask)
	map \|= hip04_cpu_map[cpu];

	/*
	* Ensure that stores to Normal memory are visible to the
	* other CPUs before they observe us issuing the IPI.
	*/
	dmb(ishst);

	/* this always happens on GIC0 */
	writel_relaxed(map << 8 \| irq, hip04_data.dist_base + GIC_DIST_SOFTINT);

	raw_spin_unlock_irqrestore(&irq_controller_lock, flags);
	}
	#endif

	static int hip04_irq_domain_map(struct irq_domain *d, unsigned int irq,
	irq_hw_number_t hw)
	{
	if (hw < 32) {
	irq_set_percpu_devid(irq);
	irq_set_chip_and_handler(irq, &hip04_irq_chip,
	handle_percpu_devid_irq);
	irq_set_status_flags(irq, IRQ_NOAUTOEN);
	} else {
	irq_set_chip_and_handler(irq, &hip04_irq_chip,
	handle_fasteoi_irq);
	irq_set_probe(irq);
	}
	irq_set_chip_data(irq, d->host_data);
	return 0;
	}

	static int hip04_irq_domain_xlate(struct irq_domain *d,
	struct device_node *controller,
	const u32 *intspec, unsigned int intsize,
	unsigned long *out_hwirq,
	unsigned int *out_type)
	{
	unsigned long ret = 0;

	if (irq_domain_get_of_node(d) != controller)
	return -EINVAL;
	if (intsize < 3)
	return -EINVAL;

	/* Get the interrupt number and add 16 to skip over SGIs */
	*out_hwirq = intspec[1] + 16;

	/* For SPIs, we need to add 16 more to get the irq ID number */
	if (!intspec[0])
	*out_hwirq += 16;

	*out_type = intspec[2] & IRQ_TYPE_SENSE_MASK;

	return ret;
	}

	#ifdef CONFIG_SMP
	static int hip04_irq_secondary_init(struct notifier_block *nfb,
	unsigned long action,
	void *hcpu)
	{
	if (action == CPU_STARTING \|\| action == CPU_STARTING_FROZEN)
	hip04_irq_cpu_init(&hip04_data);
	return NOTIFY_OK;
	}

	/*
	* Notifier for enabling the INTC CPU interface. Set an arbitrarily high
	* priority because the GIC needs to be up before the ARM generic timers.
	*/
	static struct notifier_block hip04_irq_cpu_notifier = {
	.notifier_call = hip04_irq_secondary_init,
	.priority = 100,
	};
	#endif

	static const struct irq_domain_ops hip04_irq_domain_ops = {
	.map = hip04_irq_domain_map,
	.xlate = hip04_irq_domain_xlate,
	};

	static int __init
	hip04_of_init(struct device_node node, struct device_node parent)
	{
	irq_hw_number_t hwirq_base = 16;
	int nr_irqs, irq_base, i;

	if (WARN_ON(!node))
	return -ENODEV;

	hip04_data.dist_base = of_iomap(node, 0);
	WARN(!hip04_data.dist_base, "fail to map hip04 intc dist registers\n");

	hip04_data.cpu_base = of_iomap(node, 1);
	WARN(!hip04_data.cpu_base, "unable to map hip04 intc cpu registers\n");

	/*
	* Initialize the CPU interface map to all CPUs.
	* It will be refined as each CPU probes its ID.
	*/
	for (i = 0; i < NR_HIP04_CPU_IF; i++)
	hip04_cpu_map[i] = 0xffff;

	/*
	* Find out how many interrupts are supported.
	* The HIP04 INTC only supports up to 510 interrupt sources.
	*/
	nr_irqs = readl_relaxed(hip04_data.dist_base + GIC_DIST_CTR) & 0x1f;
	nr_irqs = (nr_irqs + 1) * 32;
	if (nr_irqs > HIP04_MAX_IRQS)
	nr_irqs = HIP04_MAX_IRQS;
	hip04_data.nr_irqs = nr_irqs;

	nr_irqs -= hwirq_base; /* calculate # of irqs to allocate */

	irq_base = irq_alloc_descs(-1, hwirq_base, nr_irqs, numa_node_id());
	if (IS_ERR_VALUE(irq_base)) {
	pr_err("failed to allocate IRQ numbers\n");
	return -EINVAL;
	}

	hip04_data.domain = irq_domain_add_legacy(node, nr_irqs, irq_base,
	hwirq_base,
	&hip04_irq_domain_ops,
	&hip04_data);

	if (WARN_ON(!hip04_data.domain))
	return -EINVAL;

	#ifdef CONFIG_SMP
	set_smp_cross_call(hip04_raise_softirq);
	register_cpu_notifier(&hip04_irq_cpu_notifier);
	#endif
	set_handle_irq(hip04_handle_irq);

	hip04_irq_dist_init(&hip04_data);
	hip04_irq_cpu_init(&hip04_data);

	return 0;
	}
	IRQCHIP_DECLARE(hip04_intc, "hisilicon,hip04-intc", hip04_of_init);