[linux.git] / drivers / irqchip / irq-hip04.c

/*
 * 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;
}

static int hip04_irq_starting_cpu(unsigned int cpu)
{
	hip04_irq_cpu_init(&hip04_data);
	return 0;
}

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 (irq_base < 0) {
		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);
#endif
	set_handle_irq(hip04_handle_irq);

	hip04_irq_dist_init(&hip04_data);
	cpuhp_setup_state(CPUHP_AP_IRQ_HIP04_STARTING, "AP_IRQ_HIP04_STARTING",
			  hip04_irq_starting_cpu, NULL);
	return 0;
}
IRQCHIP_DECLARE(hip04_intc, "hisilicon,hip04-intc", hip04_of_init);
Commit	Line	Data
8e4bebe0 HZ	1	/*
	2	* Hisilicon HiP04 INTC
	3	*
	4	* Copyright (C) 2002-2014 ARM Limited.
	5	* Copyright (c) 2013-2014 Hisilicon Ltd.
	6	* Copyright (c) 2013-2014 Linaro Ltd.
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*
	12	* Interrupt architecture for the HIP04 INTC:
	13	*
	14	* o There is one Interrupt Distributor, which receives interrupts
	15	* from system devices and sends them to the Interrupt Controllers.
	16	*
	17	* o There is one CPU Interface per CPU, which sends interrupts sent
	18	* by the Distributor, and interrupts generated locally, to the
	19	* associated CPU. The base address of the CPU interface is usually
	20	* aliased so that the same address points to different chips depending
	21	* on the CPU it is accessed from.
	22	*
	23	* Note that IRQs 0-31 are special - they are local to each CPU.
	24	* As such, the enable set/clear, pending set/clear and active bit
	25	* registers are banked per-cpu for these sources.
	26	*/
	27
	28	#include <linux/init.h>
	29	#include <linux/kernel.h>
	30	#include <linux/err.h>
	31	#include <linux/module.h>
	32	#include <linux/list.h>
	33	#include <linux/smp.h>
	34	#include <linux/cpu.h>
	35	#include <linux/cpu_pm.h>
	36	#include <linux/cpumask.h>
	37	#include <linux/io.h>
	38	#include <linux/of.h>
	39	#include <linux/of_address.h>
	40	#include <linux/of_irq.h>
	41	#include <linux/irqdomain.h>
	42	#include <linux/interrupt.h>
	43	#include <linux/slab.h>
41a83e06	44	#include <linux/irqchip.h>
8e4bebe0 HZ	45	#include <linux/irqchip/arm-gic.h>
	46
	47	#include <asm/irq.h>
	48	#include <asm/exception.h>
	49	#include <asm/smp_plat.h>
	50
	51	#include "irq-gic-common.h"
8e4bebe0 HZ	52
	53	#define HIP04_MAX_IRQS 510
	54
	55	struct hip04_irq_data {
	56	void __iomem *dist_base;
	57	void __iomem *cpu_base;
	58	struct irq_domain *domain;
	59	unsigned int nr_irqs;
	60	};
	61
	62	static DEFINE_RAW_SPINLOCK(irq_controller_lock);
	63
	64	/*
	65	* The GIC mapping of CPU interfaces does not necessarily match
	66	* the logical CPU numbering. Let's use a mapping as returned
	67	* by the GIC itself.
	68	*/
	69	#define NR_HIP04_CPU_IF 16
	70	static u16 hip04_cpu_map[NR_HIP04_CPU_IF] __read_mostly;
	71
	72	static struct hip04_irq_data hip04_data __read_mostly;
	73
	74	static inline void __iomem hip04_dist_base(struct irq_data d)
	75	{
	76	struct hip04_irq_data *hip04_data = irq_data_get_irq_chip_data(d);
	77	return hip04_data->dist_base;
	78	}
	79
	80	static inline void __iomem hip04_cpu_base(struct irq_data d)
	81	{
	82	struct hip04_irq_data *hip04_data = irq_data_get_irq_chip_data(d);
	83	return hip04_data->cpu_base;
	84	}
	85
	86	static inline unsigned int hip04_irq(struct irq_data *d)
	87	{
	88	return d->hwirq;
	89	}
	90
	91	/*
	92	* Routines to acknowledge, disable and enable interrupts
	93	*/
	94	static void hip04_mask_irq(struct irq_data *d)
	95	{
	96	u32 mask = 1 << (hip04_irq(d) % 32);
	97
	98	raw_spin_lock(&irq_controller_lock);
	99	writel_relaxed(mask, hip04_dist_base(d) + GIC_DIST_ENABLE_CLEAR +
	100	(hip04_irq(d) / 32) * 4);
	101	raw_spin_unlock(&irq_controller_lock);
	102	}
	103
	104	static void hip04_unmask_irq(struct irq_data *d)
	105	{
	106	u32 mask = 1 << (hip04_irq(d) % 32);
	107
	108	raw_spin_lock(&irq_controller_lock);
	109	writel_relaxed(mask, hip04_dist_base(d) + GIC_DIST_ENABLE_SET +
	110	(hip04_irq(d) / 32) * 4);
	111	raw_spin_unlock(&irq_controller_lock);
	112	}
	113
	114	static void hip04_eoi_irq(struct irq_data *d)
	115	{
116	writel_relaxed(hip04_irq(d), hip04_cpu_base(d) + GIC_CPU_EOI);
117	}
118
119	static int hip04_irq_set_type(struct irq_data *d, unsigned int type)
120	{
121	void __iomem *base = hip04_dist_base(d);
122	unsigned int irq = hip04_irq(d);
fb7e7deb	123	int ret;
8e4bebe0 HZ	124
	125	/* Interrupt configuration for SGIs can't be changed */
	126	if (irq < 16)
	127	return -EINVAL;
	128
fb7e7deb LD	129	/* SPIs have restrictions on the supported types */
	130	if (irq >= 32 && type != IRQ_TYPE_LEVEL_HIGH &&
	131	type != IRQ_TYPE_EDGE_RISING)
8e4bebe0 HZ	132	return -EINVAL;
	133
	134	raw_spin_lock(&irq_controller_lock);
	135
fb7e7deb	136	ret = gic_configure_irq(irq, type, base, NULL);
8e4bebe0 HZ	137
	138	raw_spin_unlock(&irq_controller_lock);
	139
fb7e7deb	140	return ret;
8e4bebe0 HZ	141	}
	142
	143	#ifdef CONFIG_SMP
	144	static int hip04_irq_set_affinity(struct irq_data *d,
	145	const struct cpumask *mask_val,
	146	bool force)
	147	{
	148	void __iomem *reg;
	149	unsigned int cpu, shift = (hip04_irq(d) % 2) * 16;
	150	u32 val, mask, bit;
	151
	152	if (!force)
	153	cpu = cpumask_any_and(mask_val, cpu_online_mask);
	154	else
	155	cpu = cpumask_first(mask_val);
	156
	157	if (cpu >= NR_HIP04_CPU_IF \|\| cpu >= nr_cpu_ids)
	158	return -EINVAL;
	159
	160	raw_spin_lock(&irq_controller_lock);
	161	reg = hip04_dist_base(d) + GIC_DIST_TARGET + ((hip04_irq(d) * 2) & ~3);
	162	mask = 0xffff << shift;
	163	bit = hip04_cpu_map[cpu] << shift;
	164	val = readl_relaxed(reg) & ~mask;
	165	writel_relaxed(val \| bit, reg);
	166	raw_spin_unlock(&irq_controller_lock);
	167
	168	return IRQ_SET_MASK_OK;
	169	}
	170	#endif
	171
	172	static void __exception_irq_entry hip04_handle_irq(struct pt_regs *regs)
	173	{
	174	u32 irqstat, irqnr;
	175	void __iomem *cpu_base = hip04_data.cpu_base;
	176
	177	do {
	178	irqstat = readl_relaxed(cpu_base + GIC_CPU_INTACK);
	179	irqnr = irqstat & GICC_IAR_INT_ID_MASK;
	180
	181	if (likely(irqnr > 15 && irqnr <= HIP04_MAX_IRQS)) {
3fe14927	182	handle_domain_irq(hip04_data.domain, irqnr, regs);
8e4bebe0 HZ	183	continue;
	184	}
	185	if (irqnr < 16) {
	186	writel_relaxed(irqstat, cpu_base + GIC_CPU_EOI);
	187	#ifdef CONFIG_SMP
	188	handle_IPI(irqnr, regs);
	189	#endif
	190	continue;
	191	}
	192	break;
	193	} while (1);
	194	}
	195
	196	static struct irq_chip hip04_irq_chip = {
	197	.name = "HIP04 INTC",
	198	.irq_mask = hip04_mask_irq,
	199	.irq_unmask = hip04_unmask_irq,
	200	.irq_eoi = hip04_eoi_irq,
	201	.irq_set_type = hip04_irq_set_type,
	202	#ifdef CONFIG_SMP
	203	.irq_set_affinity = hip04_irq_set_affinity,
	204	#endif
aec89ef7 SH	205	.flags = IRQCHIP_SET_TYPE_MASKED \|
	206	IRQCHIP_SKIP_SET_WAKE \|
	207	IRQCHIP_MASK_ON_SUSPEND,
8e4bebe0 HZ	208	};
	209
	210	static u16 hip04_get_cpumask(struct hip04_irq_data *intc)
	211	{
	212	void __iomem *base = intc->dist_base;
	213	u32 mask, i;
	214
	215	for (i = mask = 0; i < 32; i += 2) {
	216	mask = readl_relaxed(base + GIC_DIST_TARGET + i * 2);
	217	mask \|= mask >> 16;
	218	if (mask)
	219	break;
	220	}
	221
	222	if (!mask)
	223	pr_crit("GIC CPU mask not found - kernel will fail to boot.\n");
	224
	225	return mask;
	226	}
	227
	228	static void __init hip04_irq_dist_init(struct hip04_irq_data *intc)
	229	{
	230	unsigned int i;
	231	u32 cpumask;
	232	unsigned int nr_irqs = intc->nr_irqs;
	233	void __iomem *base = intc->dist_base;
	234
	235	writel_relaxed(0, base + GIC_DIST_CTRL);
	236
	237	/*
	238	* Set all global interrupts to this CPU only.
	239	*/
	240	cpumask = hip04_get_cpumask(intc);
	241	cpumask \|= cpumask << 16;
	242	for (i = 32; i < nr_irqs; i += 2)
	243	writel_relaxed(cpumask, base + GIC_DIST_TARGET + ((i * 2) & ~3));
	244
	245	gic_dist_config(base, nr_irqs, NULL);
	246
	247	writel_relaxed(1, base + GIC_DIST_CTRL);
	248	}
	249
	250	static void hip04_irq_cpu_init(struct hip04_irq_data *intc)
	251	{
	252	void __iomem *dist_base = intc->dist_base;
	253	void __iomem *base = intc->cpu_base;
	254	unsigned int cpu_mask, cpu = smp_processor_id();
	255	int i;
	256
	257	/*
	258	* Get what the GIC says our CPU mask is.
	259	*/
	260	BUG_ON(cpu >= NR_HIP04_CPU_IF);
	261	cpu_mask = hip04_get_cpumask(intc);
	262	hip04_cpu_map[cpu] = cpu_mask;
	263
	264	/*
	265	* Clear our mask from the other map entries in case they're
	266	* still undefined.
	267	*/
	268	for (i = 0; i < NR_HIP04_CPU_IF; i++)
	269	if (i != cpu)
	270	hip04_cpu_map[i] &= ~cpu_mask;
	271
272	gic_cpu_config(dist_base, NULL);
273
274	writel_relaxed(0xf0, base + GIC_CPU_PRIMASK);
275	writel_relaxed(1, base + GIC_CPU_CTRL);
276	}
277
278	#ifdef CONFIG_SMP
279	static void hip04_raise_softirq(const struct cpumask *mask, unsigned int irq)
280	{
281	int cpu;
282	unsigned long flags, map = 0;
283
284	raw_spin_lock_irqsave(&irq_controller_lock, flags);
285
286	/* Convert our logical CPU mask into a physical one. */
287	for_each_cpu(cpu, mask)
288	map \|= hip04_cpu_map[cpu];
289
290	/*
291	* Ensure that stores to Normal memory are visible to the
292	* other CPUs before they observe us issuing the IPI.
293	*/
294	dmb(ishst);
295
296	/* this always happens on GIC0 */
297	writel_relaxed(map << 8 \| irq, hip04_data.dist_base + GIC_DIST_SOFTINT);
298
299	raw_spin_unlock_irqrestore(&irq_controller_lock, flags);
300	}
301	#endif
302
303	static int hip04_irq_domain_map(struct irq_domain *d, unsigned int irq,
304	irq_hw_number_t hw)
305	{
306	if (hw < 32) {
307	irq_set_percpu_devid(irq);
308	irq_set_chip_and_handler(irq, &hip04_irq_chip,
309	handle_percpu_devid_irq);
d17cab44	310	irq_set_status_flags(irq, IRQ_NOAUTOEN);
8e4bebe0 HZ	311	} else {
	312	irq_set_chip_and_handler(irq, &hip04_irq_chip,
	313	handle_fasteoi_irq);
d17cab44	314	irq_set_probe(irq);
8e4bebe0 HZ	315	}
	316	irq_set_chip_data(irq, d->host_data);
	317	return 0;
	318	}
	319
	320	static int hip04_irq_domain_xlate(struct irq_domain *d,
	321	struct device_node *controller,
	322	const u32 *intspec, unsigned int intsize,
	323	unsigned long *out_hwirq,
	324	unsigned int *out_type)
	325	{
	326	unsigned long ret = 0;
	327
5d4c9bc7	328	if (irq_domain_get_of_node(d) != controller)
8e4bebe0 HZ	329	return -EINVAL;
	330	if (intsize < 3)
	331	return -EINVAL;
	332
	333	/* Get the interrupt number and add 16 to skip over SGIs */
	334	*out_hwirq = intspec[1] + 16;
	335
	336	/* For SPIs, we need to add 16 more to get the irq ID number */
	337	if (!intspec[0])
	338	*out_hwirq += 16;
	339
	340	*out_type = intspec[2] & IRQ_TYPE_SENSE_MASK;
	341
	342	return ret;
	343	}
	344
6c034d17	345	static int hip04_irq_starting_cpu(unsigned int cpu)
8e4bebe0	346	{
6c034d17 RC	347	hip04_irq_cpu_init(&hip04_data);
6c034d17 RC	348	return 0;
8e4bebe0 HZ	349	}
8e4bebe0 HZ	350
8e4bebe0 HZ	351	static const struct irq_domain_ops hip04_irq_domain_ops = {
	352	.map = hip04_irq_domain_map,
	353	.xlate = hip04_irq_domain_xlate,
	354	};
	355
	356	static int __init
	357	hip04_of_init(struct device_node node, struct device_node parent)
	358	{
	359	irq_hw_number_t hwirq_base = 16;
	360	int nr_irqs, irq_base, i;
	361
	362	if (WARN_ON(!node))
	363	return -ENODEV;
	364
	365	hip04_data.dist_base = of_iomap(node, 0);
	366	WARN(!hip04_data.dist_base, "fail to map hip04 intc dist registers\n");
	367
	368	hip04_data.cpu_base = of_iomap(node, 1);
	369	WARN(!hip04_data.cpu_base, "unable to map hip04 intc cpu registers\n");
	370
	371	/*
	372	* Initialize the CPU interface map to all CPUs.
	373	* It will be refined as each CPU probes its ID.
	374	*/
	375	for (i = 0; i < NR_HIP04_CPU_IF; i++)
03d3d45b	376	hip04_cpu_map[i] = 0xffff;
8e4bebe0 HZ	377
	378	/*
	379	* Find out how many interrupts are supported.
	380	* The HIP04 INTC only supports up to 510 interrupt sources.
	381	*/
	382	nr_irqs = readl_relaxed(hip04_data.dist_base + GIC_DIST_CTR) & 0x1f;
	383	nr_irqs = (nr_irqs + 1) * 32;
	384	if (nr_irqs > HIP04_MAX_IRQS)
	385	nr_irqs = HIP04_MAX_IRQS;
	386	hip04_data.nr_irqs = nr_irqs;
	387
	388	nr_irqs -= hwirq_base; /* calculate # of irqs to allocate */
	389
	390	irq_base = irq_alloc_descs(-1, hwirq_base, nr_irqs, numa_node_id());
287980e4	391	if (irq_base < 0) {
8e4bebe0 HZ	392	pr_err("failed to allocate IRQ numbers\n");
	393	return -EINVAL;
	394	}
	395
	396	hip04_data.domain = irq_domain_add_legacy(node, nr_irqs, irq_base,
	397	hwirq_base,
	398	&hip04_irq_domain_ops,
	399	&hip04_data);
	400
	401	if (WARN_ON(!hip04_data.domain))
	402	return -EINVAL;
	403
	404	#ifdef CONFIG_SMP
	405	set_smp_cross_call(hip04_raise_softirq);
8e4bebe0 HZ	406	#endif
	407	set_handle_irq(hip04_handle_irq);
	408
	409	hip04_irq_dist_init(&hip04_data);
6c034d17 RC	410	cpuhp_setup_state(CPUHP_AP_IRQ_HIP04_STARTING, "AP_IRQ_HIP04_STARTING",
6c034d17 RC	411	hip04_irq_starting_cpu, NULL);
8e4bebe0 HZ	412	return 0;
	413	}
	414	IRQCHIP_DECLARE(hip04_intc, "hisilicon,hip04-intc", hip04_of_init);