drivers/irqchip/exynos-combiner.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /*
  * Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
  *		http://www.samsung.com
  *
  * Combiner irqchip for EXYNOS
  */
 #include <linux/err.h>
 #include <linux/export.h>
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/slab.h>
 #include <linux/syscore_ops.h>
 #include <linux/irqdomain.h>
 #include <linux/irqchip.h>
 #include <linux/irqchip/chained_irq.h>
 #include <linux/interrupt.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>

 #define COMBINER_ENABLE_SET	0x0
 #define COMBINER_ENABLE_CLEAR	0x4
 #define COMBINER_INT_STATUS	0xC

 #define IRQ_IN_COMBINER		8

 static DEFINE_SPINLOCK(irq_controller_lock);

 struct combiner_chip_data {
 	unsigned int hwirq_offset;
 	unsigned int irq_mask;
 	void __iomem *base;
 	unsigned int parent_irq;
 #ifdef CONFIG_PM
 	u32 pm_save;
 #endif
 };

 static struct combiner_chip_data *combiner_data;
 static struct irq_domain *combiner_irq_domain;
 static unsigned int max_nr = 20;

 static inline void __iomem *combiner_base(struct irq_data *data)
 {
 	struct combiner_chip_data *combiner_data =
 		irq_data_get_irq_chip_data(data);

 	return combiner_data->base;
 }

 static void combiner_mask_irq(struct irq_data *data)
 {
 	u32 mask = 1 << (data->hwirq % 32);

 	writel_relaxed(mask, combiner_base(data) + COMBINER_ENABLE_CLEAR);
 }

 static void combiner_unmask_irq(struct irq_data *data)
 {
 	u32 mask = 1 << (data->hwirq % 32);

 	writel_relaxed(mask, combiner_base(data) + COMBINER_ENABLE_SET);
 }

 static void combiner_handle_cascade_irq(struct irq_desc *desc)
 {
 	struct combiner_chip_data *chip_data = irq_desc_get_handler_data(desc);
 	struct irq_chip *chip = irq_desc_get_chip(desc);
 	unsigned int combiner_irq;
 	unsigned long status;
 	int ret;

 	chained_irq_enter(chip, desc);

 	spin_lock(&irq_controller_lock);
 	status = readl_relaxed(chip_data->base + COMBINER_INT_STATUS);
 	spin_unlock(&irq_controller_lock);
 	status &= chip_data->irq_mask;

 	if (status == 0)
 		goto out;

 	combiner_irq = chip_data->hwirq_offset + __ffs(status);
 	ret = generic_handle_domain_irq(combiner_irq_domain, combiner_irq);
 	if (unlikely(ret))
 		handle_bad_irq(desc);

  out:
 	chained_irq_exit(chip, desc);
 }

 #ifdef CONFIG_SMP
 static int combiner_set_affinity(struct irq_data *d,
 				 const struct cpumask *mask_val, bool force)
 {
 	struct combiner_chip_data *chip_data = irq_data_get_irq_chip_data(d);
 	struct irq_chip *chip = irq_get_chip(chip_data->parent_irq);
 	struct irq_data *data = irq_get_irq_data(chip_data->parent_irq);

 	if (chip && chip->irq_set_affinity)
 		return chip->irq_set_affinity(data, mask_val, force);
 	else
 		return -EINVAL;
 }
 #endif

 static struct irq_chip combiner_chip = {
 	.name			= "COMBINER",
 	.irq_mask		= combiner_mask_irq,
 	.irq_unmask		= combiner_unmask_irq,
 #ifdef CONFIG_SMP
 	.irq_set_affinity	= combiner_set_affinity,
 #endif
 };

 static void __init combiner_cascade_irq(struct combiner_chip_data *combiner_data,
 					unsigned int irq)
 {
 	irq_set_chained_handler_and_data(irq, combiner_handle_cascade_irq,
 					 combiner_data);
 }

 static void __init combiner_init_one(struct combiner_chip_data *combiner_data,
 				     unsigned int combiner_nr,
 				     void __iomem *base, unsigned int irq)
 {
 	combiner_data->base = base;
 	combiner_data->hwirq_offset = (combiner_nr & ~3) * IRQ_IN_COMBINER;
 	combiner_data->irq_mask = 0xff << ((combiner_nr % 4) << 3);
 	combiner_data->parent_irq = irq;

 	/* Disable all interrupts */
 	writel_relaxed(combiner_data->irq_mask, base + COMBINER_ENABLE_CLEAR);
 }

 static int combiner_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)
 {
 	if (irq_domain_get_of_node(d) != controller)
 		return -EINVAL;

 	if (intsize < 2)
 		return -EINVAL;

 	*out_hwirq = intspec[0] * IRQ_IN_COMBINER + intspec[1];
 	*out_type = 0;

 	return 0;
 }

 static int combiner_irq_domain_map(struct irq_domain *d, unsigned int irq,
 				   irq_hw_number_t hw)
 {
 	struct combiner_chip_data *combiner_data = d->host_data;

 	irq_set_chip_and_handler(irq, &combiner_chip, handle_level_irq);
 	irq_set_chip_data(irq, &combiner_data[hw >> 3]);
 	irq_set_probe(irq);

 	return 0;
 }

 static const struct irq_domain_ops combiner_irq_domain_ops = {
 	.xlate	= combiner_irq_domain_xlate,
 	.map	= combiner_irq_domain_map,
 };

 static void __init combiner_init(void __iomem *combiner_base,
 				 struct device_node *np)
 {
 	int i, irq;
 	unsigned int nr_irq;

 	nr_irq = max_nr * IRQ_IN_COMBINER;

 	combiner_data = kcalloc(max_nr, sizeof (*combiner_data), GFP_KERNEL);
 	if (!combiner_data)
 		return;

 	combiner_irq_domain = irq_domain_add_linear(np, nr_irq,
 				&combiner_irq_domain_ops, combiner_data);
 	if (WARN_ON(!combiner_irq_domain)) {
 		pr_warn("%s: irq domain init failed\n", __func__);
 		return;
 	}

 	for (i = 0; i < max_nr; i++) {
 		irq = irq_of_parse_and_map(np, i);

 		combiner_init_one(&combiner_data[i], i,
 				  combiner_base + (i >> 2) * 0x10, irq);
 		combiner_cascade_irq(&combiner_data[i], irq);
 	}
 }

 #ifdef CONFIG_PM

 /**
  * combiner_suspend - save interrupt combiner state before suspend
  *
  * Save the interrupt enable set register for all combiner groups since
  * the state is lost when the system enters into a sleep state.
  *
  */
 static int combiner_suspend(void)
 {
 	int i;

 	for (i = 0; i < max_nr; i++)
 		combiner_data[i].pm_save =
 			readl_relaxed(combiner_data[i].base + COMBINER_ENABLE_SET);

 	return 0;
 }

 /**
  * combiner_resume - restore interrupt combiner state after resume
  *
  * Restore the interrupt enable set register for all combiner groups since
  * the state is lost when the system enters into a sleep state on suspend.
  *
  */
 static void combiner_resume(void)
 {
 	int i;

 	for (i = 0; i < max_nr; i++) {
 		writel_relaxed(combiner_data[i].irq_mask,
 			     combiner_data[i].base + COMBINER_ENABLE_CLEAR);
 		writel_relaxed(combiner_data[i].pm_save,
 			     combiner_data[i].base + COMBINER_ENABLE_SET);
 	}
 }

 #else
 #define combiner_suspend	NULL
 #define combiner_resume		NULL
 #endif

 static struct syscore_ops combiner_syscore_ops = {
 	.suspend	= combiner_suspend,
 	.resume		= combiner_resume,
 };

 static int __init combiner_of_init(struct device_node *np,
 				   struct device_node *parent)
 {
 	void __iomem *combiner_base;

 	combiner_base = of_iomap(np, 0);
 	if (!combiner_base) {
 		pr_err("%s: failed to map combiner registers\n", __func__);
 		return -ENXIO;
 	}

 	if (of_property_read_u32(np, "samsung,combiner-nr", &max_nr)) {
 		pr_info("%s: number of combiners not specified, "
 			"setting default as %d.\n",
 			__func__, max_nr);
 	}

 	combiner_init(combiner_base, np);

 	register_syscore_ops(&combiner_syscore_ops);

 	return 0;
 }
 IRQCHIP_DECLARE(exynos4210_combiner, "samsung,exynos4210-combiner",
 		combiner_of_init);
	// SPDX-License-Identifier: GPL-2.0-only
	/*
	* Copyright (c) 2010-2011 Samsung Electronics Co., Ltd.
	* http://www.samsung.com
	*
	* Combiner irqchip for EXYNOS
	*/
	#include <linux/err.h>
	#include <linux/export.h>
	#include <linux/init.h>
	#include <linux/io.h>
	#include <linux/slab.h>
	#include <linux/syscore_ops.h>
	#include <linux/irqdomain.h>
	#include <linux/irqchip.h>
	#include <linux/irqchip/chained_irq.h>
	#include <linux/interrupt.h>
	#include <linux/of_address.h>
	#include <linux/of_irq.h>

	#define COMBINER_ENABLE_SET 0x0
	#define COMBINER_ENABLE_CLEAR 0x4
	#define COMBINER_INT_STATUS 0xC

	#define IRQ_IN_COMBINER 8

	static DEFINE_SPINLOCK(irq_controller_lock);

	struct combiner_chip_data {
	unsigned int hwirq_offset;
	unsigned int irq_mask;
	void __iomem *base;
	unsigned int parent_irq;
	#ifdef CONFIG_PM
	u32 pm_save;
	#endif
	};

	static struct combiner_chip_data *combiner_data;
	static struct irq_domain *combiner_irq_domain;
	static unsigned int max_nr = 20;

	static inline void __iomem combiner_base(struct irq_data data)
	{
	struct combiner_chip_data *combiner_data =
	irq_data_get_irq_chip_data(data);

	return combiner_data->base;
	}

	static void combiner_mask_irq(struct irq_data *data)
	{
	u32 mask = 1 << (data->hwirq % 32);

	writel_relaxed(mask, combiner_base(data) + COMBINER_ENABLE_CLEAR);
	}

	static void combiner_unmask_irq(struct irq_data *data)
	{
	u32 mask = 1 << (data->hwirq % 32);

	writel_relaxed(mask, combiner_base(data) + COMBINER_ENABLE_SET);
	}

	static void combiner_handle_cascade_irq(struct irq_desc *desc)
	{
	struct combiner_chip_data *chip_data = irq_desc_get_handler_data(desc);
	struct irq_chip *chip = irq_desc_get_chip(desc);
	unsigned int combiner_irq;
	unsigned long status;
	int ret;

	chained_irq_enter(chip, desc);

	spin_lock(&irq_controller_lock);
	status = readl_relaxed(chip_data->base + COMBINER_INT_STATUS);
	spin_unlock(&irq_controller_lock);
	status &= chip_data->irq_mask;

	if (status == 0)
	goto out;

	combiner_irq = chip_data->hwirq_offset + __ffs(status);
	ret = generic_handle_domain_irq(combiner_irq_domain, combiner_irq);
	if (unlikely(ret))
	handle_bad_irq(desc);

	out:
	chained_irq_exit(chip, desc);
	}

	#ifdef CONFIG_SMP
	static int combiner_set_affinity(struct irq_data *d,
	const struct cpumask *mask_val, bool force)
	{
	struct combiner_chip_data *chip_data = irq_data_get_irq_chip_data(d);
	struct irq_chip *chip = irq_get_chip(chip_data->parent_irq);
	struct irq_data *data = irq_get_irq_data(chip_data->parent_irq);

	if (chip && chip->irq_set_affinity)
	return chip->irq_set_affinity(data, mask_val, force);
	else
	return -EINVAL;
	}
	#endif

	static struct irq_chip combiner_chip = {
	.name = "COMBINER",
	.irq_mask = combiner_mask_irq,
	.irq_unmask = combiner_unmask_irq,
	#ifdef CONFIG_SMP
	.irq_set_affinity = combiner_set_affinity,
	#endif
	};

	static void __init combiner_cascade_irq(struct combiner_chip_data *combiner_data,
	unsigned int irq)
	{
	irq_set_chained_handler_and_data(irq, combiner_handle_cascade_irq,
	combiner_data);
	}

	static void __init combiner_init_one(struct combiner_chip_data *combiner_data,
	unsigned int combiner_nr,
	void __iomem *base, unsigned int irq)
	{
	combiner_data->base = base;
	combiner_data->hwirq_offset = (combiner_nr & ~3) * IRQ_IN_COMBINER;
	combiner_data->irq_mask = 0xff << ((combiner_nr % 4) << 3);
	combiner_data->parent_irq = irq;

	/* Disable all interrupts */
	writel_relaxed(combiner_data->irq_mask, base + COMBINER_ENABLE_CLEAR);
	}

	static int combiner_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)
	{
	if (irq_domain_get_of_node(d) != controller)
	return -EINVAL;

	if (intsize < 2)
	return -EINVAL;

	out_hwirq = intspec[0] IRQ_IN_COMBINER + intspec[1];
	*out_type = 0;

	return 0;
	}

	static int combiner_irq_domain_map(struct irq_domain *d, unsigned int irq,
	irq_hw_number_t hw)
	{
	struct combiner_chip_data *combiner_data = d->host_data;

	irq_set_chip_and_handler(irq, &combiner_chip, handle_level_irq);
	irq_set_chip_data(irq, &combiner_data[hw >> 3]);
	irq_set_probe(irq);

	return 0;
	}

	static const struct irq_domain_ops combiner_irq_domain_ops = {
	.xlate = combiner_irq_domain_xlate,
	.map = combiner_irq_domain_map,
	};

	static void __init combiner_init(void __iomem *combiner_base,
	struct device_node *np)
	{
	int i, irq;
	unsigned int nr_irq;

	nr_irq = max_nr * IRQ_IN_COMBINER;

	combiner_data = kcalloc(max_nr, sizeof (*combiner_data), GFP_KERNEL);
	if (!combiner_data)
	return;

	combiner_irq_domain = irq_domain_add_linear(np, nr_irq,
	&combiner_irq_domain_ops, combiner_data);
	if (WARN_ON(!combiner_irq_domain)) {
	pr_warn("%s: irq domain init failed\n", __func__);
	return;
	}

	for (i = 0; i < max_nr; i++) {
	irq = irq_of_parse_and_map(np, i);

	combiner_init_one(&combiner_data[i], i,
	combiner_base + (i >> 2) * 0x10, irq);
	combiner_cascade_irq(&combiner_data[i], irq);
	}
	}

	#ifdef CONFIG_PM

	/**
	* combiner_suspend - save interrupt combiner state before suspend
	*
	* Save the interrupt enable set register for all combiner groups since
	* the state is lost when the system enters into a sleep state.
	*
	*/
	static int combiner_suspend(void)
	{
	int i;

	for (i = 0; i < max_nr; i++)
	combiner_data[i].pm_save =
	readl_relaxed(combiner_data[i].base + COMBINER_ENABLE_SET);

	return 0;
	}

	/**
	* combiner_resume - restore interrupt combiner state after resume
	*
	* Restore the interrupt enable set register for all combiner groups since
	* the state is lost when the system enters into a sleep state on suspend.
	*
	*/
	static void combiner_resume(void)
	{
	int i;

	for (i = 0; i < max_nr; i++) {
	writel_relaxed(combiner_data[i].irq_mask,
	combiner_data[i].base + COMBINER_ENABLE_CLEAR);
	writel_relaxed(combiner_data[i].pm_save,
	combiner_data[i].base + COMBINER_ENABLE_SET);
	}
	}

	#else
	#define combiner_suspend NULL
	#define combiner_resume NULL
	#endif

	static struct syscore_ops combiner_syscore_ops = {
	.suspend = combiner_suspend,
	.resume = combiner_resume,
	};

	static int __init combiner_of_init(struct device_node *np,
	struct device_node *parent)
	{
	void __iomem *combiner_base;

	combiner_base = of_iomap(np, 0);
	if (!combiner_base) {
	pr_err("%s: failed to map combiner registers\n", __func__);
	return -ENXIO;
	}

	if (of_property_read_u32(np, "samsung,combiner-nr", &max_nr)) {
	pr_info("%s: number of combiners not specified, "
	"setting default as %d.\n",
	__func__, max_nr);
	}

	combiner_init(combiner_base, np);

	register_syscore_ops(&combiner_syscore_ops);

	return 0;
	}
	IRQCHIP_DECLARE(exynos4210_combiner, "samsung,exynos4210-combiner",
	combiner_of_init);