drivers/irqchip/irq-loongson-liointc.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /*
  *  Copyright (C) 2020, Jiaxun Yang <jiaxun.yang@flygoat.com>
  *  Loongson Local IO Interrupt Controller support
  */

 #include <linux/errno.h>
 #include <linux/init.h>
 #include <linux/types.h>
 #include <linux/interrupt.h>
 #include <linux/ioport.h>
 #include <linux/irqchip.h>
 #include <linux/of_address.h>
 #include <linux/of_irq.h>
 #include <linux/io.h>
 #include <linux/smp.h>
 #include <linux/irqchip/chained_irq.h>

 #include <loongson.h>

 #define LIOINTC_CHIP_IRQ	32
 #define LIOINTC_NUM_PARENT 4
 #define LIOINTC_NUM_CORES	4

 #define LIOINTC_INTC_CHIP_START	0x20

 #define LIOINTC_REG_INTC_STATUS	(LIOINTC_INTC_CHIP_START + 0x20)
 #define LIOINTC_REG_INTC_EN_STATUS	(LIOINTC_INTC_CHIP_START + 0x04)
 #define LIOINTC_REG_INTC_ENABLE	(LIOINTC_INTC_CHIP_START + 0x08)
 #define LIOINTC_REG_INTC_DISABLE	(LIOINTC_INTC_CHIP_START + 0x0c)
 #define LIOINTC_REG_INTC_POL	(LIOINTC_INTC_CHIP_START + 0x10)
 #define LIOINTC_REG_INTC_EDGE	(LIOINTC_INTC_CHIP_START + 0x14)

 #define LIOINTC_SHIFT_INTx	4

 #define LIOINTC_ERRATA_IRQ	10

 struct liointc_handler_data {
 	struct liointc_priv	*priv;
 	u32			parent_int_map;
 };

 struct liointc_priv {
 	struct irq_chip_generic		*gc;
 	struct liointc_handler_data	handler[LIOINTC_NUM_PARENT];
 	void __iomem			*core_isr[LIOINTC_NUM_CORES];
 	u8				map_cache[LIOINTC_CHIP_IRQ];
 	bool				has_lpc_irq_errata;
 };

 static void liointc_chained_handle_irq(struct irq_desc *desc)
 {
 	struct liointc_handler_data *handler = irq_desc_get_handler_data(desc);
 	struct irq_chip *chip = irq_desc_get_chip(desc);
 	struct irq_chip_generic *gc = handler->priv->gc;
 	int core = get_ebase_cpunum() % LIOINTC_NUM_CORES;
 	u32 pending;

 	chained_irq_enter(chip, desc);

 	pending = readl(handler->priv->core_isr[core]);

 	if (!pending) {
 		/* Always blame LPC IRQ if we have that bug */
 		if (handler->priv->has_lpc_irq_errata &&
 			(handler->parent_int_map & gc->mask_cache &
 			BIT(LIOINTC_ERRATA_IRQ)))
 			pending = BIT(LIOINTC_ERRATA_IRQ);
 		else
 			spurious_interrupt();
 	}

 	while (pending) {
 		int bit = __ffs(pending);

 		generic_handle_domain_irq(gc->domain, bit);
 		pending &= ~BIT(bit);
 	}

 	chained_irq_exit(chip, desc);
 }

 static void liointc_set_bit(struct irq_chip_generic *gc,
 				unsigned int offset,
 				u32 mask, bool set)
 {
 	if (set)
 		writel(readl(gc->reg_base + offset) | mask,
 				gc->reg_base + offset);
 	else
 		writel(readl(gc->reg_base + offset) & ~mask,
 				gc->reg_base + offset);
 }

 static int liointc_set_type(struct irq_data *data, unsigned int type)
 {
 	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data);
 	u32 mask = data->mask;
 	unsigned long flags;

 	irq_gc_lock_irqsave(gc, flags);
 	switch (type) {
 	case IRQ_TYPE_LEVEL_HIGH:
 		liointc_set_bit(gc, LIOINTC_REG_INTC_EDGE, mask, false);
 		liointc_set_bit(gc, LIOINTC_REG_INTC_POL, mask, true);
 		break;
 	case IRQ_TYPE_LEVEL_LOW:
 		liointc_set_bit(gc, LIOINTC_REG_INTC_EDGE, mask, false);
 		liointc_set_bit(gc, LIOINTC_REG_INTC_POL, mask, false);
 		break;
 	case IRQ_TYPE_EDGE_RISING:
 		liointc_set_bit(gc, LIOINTC_REG_INTC_EDGE, mask, true);
 		liointc_set_bit(gc, LIOINTC_REG_INTC_POL, mask, true);
 		break;
 	case IRQ_TYPE_EDGE_FALLING:
 		liointc_set_bit(gc, LIOINTC_REG_INTC_EDGE, mask, true);
 		liointc_set_bit(gc, LIOINTC_REG_INTC_POL, mask, false);
 		break;
 	default:
 		irq_gc_unlock_irqrestore(gc, flags);
 		return -EINVAL;
 	}
 	irq_gc_unlock_irqrestore(gc, flags);

 	irqd_set_trigger_type(data, type);
 	return 0;
 }

 static void liointc_resume(struct irq_chip_generic *gc)
 {
 	struct liointc_priv *priv = gc->private;
 	unsigned long flags;
 	int i;

 	irq_gc_lock_irqsave(gc, flags);
 	/* Disable all at first */
 	writel(0xffffffff, gc->reg_base + LIOINTC_REG_INTC_DISABLE);
 	/* Restore map cache */
 	for (i = 0; i < LIOINTC_CHIP_IRQ; i++)
 		writeb(priv->map_cache[i], gc->reg_base + i);
 	/* Restore mask cache */
 	writel(gc->mask_cache, gc->reg_base + LIOINTC_REG_INTC_ENABLE);
 	irq_gc_unlock_irqrestore(gc, flags);
 }

 static const char * const parent_names[] = {"int0", "int1", "int2", "int3"};
 static const char * const core_reg_names[] = {"isr0", "isr1", "isr2", "isr3"};

 static void __iomem *liointc_get_reg_byname(struct device_node *node,
 						const char *name)
 {
 	int index = of_property_match_string(node, "reg-names", name);

 	if (index < 0)
 		return NULL;

 	return of_iomap(node, index);
 }

 static int __init liointc_of_init(struct device_node *node,
 				  struct device_node *parent)
 {
 	struct irq_chip_generic *gc;
 	struct irq_domain *domain;
 	struct irq_chip_type *ct;
 	struct liointc_priv *priv;
 	void __iomem *base;
 	u32 of_parent_int_map[LIOINTC_NUM_PARENT];
 	int parent_irq[LIOINTC_NUM_PARENT];
 	bool have_parent = FALSE;
 	int sz, i, err = 0;

 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;

 	if (of_device_is_compatible(node, "loongson,liointc-2.0")) {
 		base = liointc_get_reg_byname(node, "main");
 		if (!base) {
 			err = -ENODEV;
 			goto out_free_priv;
 		}

 		for (i = 0; i < LIOINTC_NUM_CORES; i++)
 			priv->core_isr[i] = liointc_get_reg_byname(node, core_reg_names[i]);
 		if (!priv->core_isr[0]) {
 			err = -ENODEV;
 			goto out_iounmap_base;
 		}
 	} else {
 		base = of_iomap(node, 0);
 		if (!base) {
 			err = -ENODEV;
 			goto out_free_priv;
 		}

 		for (i = 0; i < LIOINTC_NUM_CORES; i++)
 			priv->core_isr[i] = base + LIOINTC_REG_INTC_STATUS;
 	}

 	for (i = 0; i < LIOINTC_NUM_PARENT; i++) {
 		parent_irq[i] = of_irq_get_byname(node, parent_names[i]);
 		if (parent_irq[i] > 0)
 			have_parent = TRUE;
 	}
 	if (!have_parent) {
 		err = -ENODEV;
 		goto out_iounmap_isr;
 	}

 	sz = of_property_read_variable_u32_array(node,
 						"loongson,parent_int_map",
 						&of_parent_int_map[0],
 						LIOINTC_NUM_PARENT,
 						LIOINTC_NUM_PARENT);
 	if (sz < 4) {
 		pr_err("loongson-liointc: No parent_int_map\n");
 		err = -ENODEV;
 		goto out_iounmap_isr;
 	}

 	for (i = 0; i < LIOINTC_NUM_PARENT; i++)
 		priv->handler[i].parent_int_map = of_parent_int_map[i];

 	/* Setup IRQ domain */
 	domain = irq_domain_add_linear(node, 32,
 					&irq_generic_chip_ops, priv);
 	if (!domain) {
 		pr_err("loongson-liointc: cannot add IRQ domain\n");
 		err = -EINVAL;
 		goto out_iounmap_isr;
 	}

 	err = irq_alloc_domain_generic_chips(domain, 32, 1,
 					node->full_name, handle_level_irq,
 					IRQ_NOPROBE, 0, 0);
 	if (err) {
 		pr_err("loongson-liointc: unable to register IRQ domain\n");
 		goto out_free_domain;
 	}


 	/* Disable all IRQs */
 	writel(0xffffffff, base + LIOINTC_REG_INTC_DISABLE);
 	/* Set to level triggered */
 	writel(0x0, base + LIOINTC_REG_INTC_EDGE);

 	/* Generate parent INT part of map cache */
 	for (i = 0; i < LIOINTC_NUM_PARENT; i++) {
 		u32 pending = priv->handler[i].parent_int_map;

 		while (pending) {
 			int bit = __ffs(pending);

 			priv->map_cache[bit] = BIT(i) << LIOINTC_SHIFT_INTx;
 			pending &= ~BIT(bit);
 		}
 	}

 	for (i = 0; i < LIOINTC_CHIP_IRQ; i++) {
 		/* Generate core part of map cache */
 		priv->map_cache[i] |= BIT(loongson_sysconf.boot_cpu_id);
 		writeb(priv->map_cache[i], base + i);
 	}

 	gc = irq_get_domain_generic_chip(domain, 0);
 	gc->private = priv;
 	gc->reg_base = base;
 	gc->domain = domain;
 	gc->resume = liointc_resume;

 	ct = gc->chip_types;
 	ct->regs.enable = LIOINTC_REG_INTC_ENABLE;
 	ct->regs.disable = LIOINTC_REG_INTC_DISABLE;
 	ct->chip.irq_unmask = irq_gc_unmask_enable_reg;
 	ct->chip.irq_mask = irq_gc_mask_disable_reg;
 	ct->chip.irq_mask_ack = irq_gc_mask_disable_reg;
 	ct->chip.irq_set_type = liointc_set_type;

 	gc->mask_cache = 0;
 	priv->gc = gc;

 	for (i = 0; i < LIOINTC_NUM_PARENT; i++) {
 		if (parent_irq[i] <= 0)
 			continue;

 		priv->handler[i].priv = priv;
 		irq_set_chained_handler_and_data(parent_irq[i],
 				liointc_chained_handle_irq, &priv->handler[i]);
 	}

 	return 0;

 out_free_domain:
 	irq_domain_remove(domain);
 out_iounmap_isr:
 	for (i = 0; i < LIOINTC_NUM_CORES; i++) {
 		if (!priv->core_isr[i])
 			continue;
 		iounmap(priv->core_isr[i]);
 	}
 out_iounmap_base:
 	iounmap(base);
 out_free_priv:
 	kfree(priv);

 	return err;
 }

 IRQCHIP_DECLARE(loongson_liointc_1_0, "loongson,liointc-1.0", liointc_of_init);
 IRQCHIP_DECLARE(loongson_liointc_1_0a, "loongson,liointc-1.0a", liointc_of_init);
 IRQCHIP_DECLARE(loongson_liointc_2_0, "loongson,liointc-2.0", liointc_of_init);
	// SPDX-License-Identifier: GPL-2.0
	/*
	* Copyright (C) 2020, Jiaxun Yang <jiaxun.yang@flygoat.com>
	* Loongson Local IO Interrupt Controller support
	*/

	#include <linux/errno.h>
	#include <linux/init.h>
	#include <linux/types.h>
	#include <linux/interrupt.h>
	#include <linux/ioport.h>
	#include <linux/irqchip.h>
	#include <linux/of_address.h>
	#include <linux/of_irq.h>
	#include <linux/io.h>
	#include <linux/smp.h>
	#include <linux/irqchip/chained_irq.h>

	#include <loongson.h>

	#define LIOINTC_CHIP_IRQ 32
	#define LIOINTC_NUM_PARENT 4
	#define LIOINTC_NUM_CORES 4

	#define LIOINTC_INTC_CHIP_START 0x20

	#define LIOINTC_REG_INTC_STATUS (LIOINTC_INTC_CHIP_START + 0x20)
	#define LIOINTC_REG_INTC_EN_STATUS (LIOINTC_INTC_CHIP_START + 0x04)
	#define LIOINTC_REG_INTC_ENABLE (LIOINTC_INTC_CHIP_START + 0x08)
	#define LIOINTC_REG_INTC_DISABLE (LIOINTC_INTC_CHIP_START + 0x0c)
	#define LIOINTC_REG_INTC_POL (LIOINTC_INTC_CHIP_START + 0x10)
	#define LIOINTC_REG_INTC_EDGE (LIOINTC_INTC_CHIP_START + 0x14)

	#define LIOINTC_SHIFT_INTx 4

	#define LIOINTC_ERRATA_IRQ 10

	struct liointc_handler_data {
	struct liointc_priv *priv;
	u32 parent_int_map;
	};

	struct liointc_priv {
	struct irq_chip_generic *gc;
	struct liointc_handler_data handler[LIOINTC_NUM_PARENT];
	void __iomem *core_isr[LIOINTC_NUM_CORES];
	u8 map_cache[LIOINTC_CHIP_IRQ];
	bool has_lpc_irq_errata;
	};

	static void liointc_chained_handle_irq(struct irq_desc *desc)
	{
	struct liointc_handler_data *handler = irq_desc_get_handler_data(desc);
	struct irq_chip *chip = irq_desc_get_chip(desc);
	struct irq_chip_generic *gc = handler->priv->gc;
	int core = get_ebase_cpunum() % LIOINTC_NUM_CORES;
	u32 pending;

	chained_irq_enter(chip, desc);

	pending = readl(handler->priv->core_isr[core]);

	if (!pending) {
	/* Always blame LPC IRQ if we have that bug */
	if (handler->priv->has_lpc_irq_errata &&
	(handler->parent_int_map & gc->mask_cache &
	BIT(LIOINTC_ERRATA_IRQ)))
	pending = BIT(LIOINTC_ERRATA_IRQ);
	else
	spurious_interrupt();
	}

	while (pending) {
	int bit = __ffs(pending);

	generic_handle_domain_irq(gc->domain, bit);
	pending &= ~BIT(bit);
	}

	chained_irq_exit(chip, desc);
	}

	static void liointc_set_bit(struct irq_chip_generic *gc,
	unsigned int offset,
	u32 mask, bool set)
	{
	if (set)
	writel(readl(gc->reg_base + offset) \| mask,
	gc->reg_base + offset);
	else
	writel(readl(gc->reg_base + offset) & ~mask,
	gc->reg_base + offset);
	}

	static int liointc_set_type(struct irq_data *data, unsigned int type)
	{
	struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data);
	u32 mask = data->mask;
	unsigned long flags;

	irq_gc_lock_irqsave(gc, flags);
	switch (type) {
	case IRQ_TYPE_LEVEL_HIGH:
	liointc_set_bit(gc, LIOINTC_REG_INTC_EDGE, mask, false);
	liointc_set_bit(gc, LIOINTC_REG_INTC_POL, mask, true);
	break;
	case IRQ_TYPE_LEVEL_LOW:
	liointc_set_bit(gc, LIOINTC_REG_INTC_EDGE, mask, false);
	liointc_set_bit(gc, LIOINTC_REG_INTC_POL, mask, false);
	break;
	case IRQ_TYPE_EDGE_RISING:
	liointc_set_bit(gc, LIOINTC_REG_INTC_EDGE, mask, true);
	liointc_set_bit(gc, LIOINTC_REG_INTC_POL, mask, true);
	break;
	case IRQ_TYPE_EDGE_FALLING:
	liointc_set_bit(gc, LIOINTC_REG_INTC_EDGE, mask, true);
	liointc_set_bit(gc, LIOINTC_REG_INTC_POL, mask, false);
	break;
	default:
	irq_gc_unlock_irqrestore(gc, flags);
	return -EINVAL;
	}
	irq_gc_unlock_irqrestore(gc, flags);

	irqd_set_trigger_type(data, type);
	return 0;
	}

	static void liointc_resume(struct irq_chip_generic *gc)
	{
	struct liointc_priv *priv = gc->private;
	unsigned long flags;
	int i;

	irq_gc_lock_irqsave(gc, flags);
	/* Disable all at first */
	writel(0xffffffff, gc->reg_base + LIOINTC_REG_INTC_DISABLE);
	/* Restore map cache */
	for (i = 0; i < LIOINTC_CHIP_IRQ; i++)
	writeb(priv->map_cache[i], gc->reg_base + i);
	/* Restore mask cache */
	writel(gc->mask_cache, gc->reg_base + LIOINTC_REG_INTC_ENABLE);
	irq_gc_unlock_irqrestore(gc, flags);
	}

	static const char * const parent_names[] = {"int0", "int1", "int2", "int3"};
	static const char * const core_reg_names[] = {"isr0", "isr1", "isr2", "isr3"};

	static void __iomem liointc_get_reg_byname(struct device_node node,
	const char *name)
	{
	int index = of_property_match_string(node, "reg-names", name);

	if (index < 0)
	return NULL;

	return of_iomap(node, index);
	}

	static int __init liointc_of_init(struct device_node *node,
	struct device_node *parent)
	{
	struct irq_chip_generic *gc;
	struct irq_domain *domain;
	struct irq_chip_type *ct;
	struct liointc_priv *priv;
	void __iomem *base;
	u32 of_parent_int_map[LIOINTC_NUM_PARENT];
	int parent_irq[LIOINTC_NUM_PARENT];
	bool have_parent = FALSE;
	int sz, i, err = 0;

	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
	if (!priv)
	return -ENOMEM;

	if (of_device_is_compatible(node, "loongson,liointc-2.0")) {
	base = liointc_get_reg_byname(node, "main");
	if (!base) {
	err = -ENODEV;
	goto out_free_priv;
	}

	for (i = 0; i < LIOINTC_NUM_CORES; i++)
	priv->core_isr[i] = liointc_get_reg_byname(node, core_reg_names[i]);
	if (!priv->core_isr[0]) {
	err = -ENODEV;
	goto out_iounmap_base;
	}
	} else {
	base = of_iomap(node, 0);
	if (!base) {
	err = -ENODEV;
	goto out_free_priv;
	}

	for (i = 0; i < LIOINTC_NUM_CORES; i++)
	priv->core_isr[i] = base + LIOINTC_REG_INTC_STATUS;
	}

	for (i = 0; i < LIOINTC_NUM_PARENT; i++) {
	parent_irq[i] = of_irq_get_byname(node, parent_names[i]);
	if (parent_irq[i] > 0)
	have_parent = TRUE;
	}
	if (!have_parent) {
	err = -ENODEV;
	goto out_iounmap_isr;
	}

	sz = of_property_read_variable_u32_array(node,
	"loongson,parent_int_map",
	&of_parent_int_map[0],
	LIOINTC_NUM_PARENT,
	LIOINTC_NUM_PARENT);
	if (sz < 4) {
	pr_err("loongson-liointc: No parent_int_map\n");
	err = -ENODEV;
	goto out_iounmap_isr;
	}

	for (i = 0; i < LIOINTC_NUM_PARENT; i++)
	priv->handler[i].parent_int_map = of_parent_int_map[i];

	/* Setup IRQ domain */
	domain = irq_domain_add_linear(node, 32,
	&irq_generic_chip_ops, priv);
	if (!domain) {
	pr_err("loongson-liointc: cannot add IRQ domain\n");
	err = -EINVAL;
	goto out_iounmap_isr;
	}

	err = irq_alloc_domain_generic_chips(domain, 32, 1,
	node->full_name, handle_level_irq,
	IRQ_NOPROBE, 0, 0);
	if (err) {
	pr_err("loongson-liointc: unable to register IRQ domain\n");
	goto out_free_domain;
	}


	/* Disable all IRQs */
	writel(0xffffffff, base + LIOINTC_REG_INTC_DISABLE);
	/* Set to level triggered */
	writel(0x0, base + LIOINTC_REG_INTC_EDGE);

	/* Generate parent INT part of map cache */
	for (i = 0; i < LIOINTC_NUM_PARENT; i++) {
	u32 pending = priv->handler[i].parent_int_map;

	while (pending) {
	int bit = __ffs(pending);

	priv->map_cache[bit] = BIT(i) << LIOINTC_SHIFT_INTx;
	pending &= ~BIT(bit);
	}
	}

	for (i = 0; i < LIOINTC_CHIP_IRQ; i++) {
	/* Generate core part of map cache */
	priv->map_cache[i] \|= BIT(loongson_sysconf.boot_cpu_id);
	writeb(priv->map_cache[i], base + i);
	}

	gc = irq_get_domain_generic_chip(domain, 0);
	gc->private = priv;
	gc->reg_base = base;
	gc->domain = domain;
	gc->resume = liointc_resume;

	ct = gc->chip_types;
	ct->regs.enable = LIOINTC_REG_INTC_ENABLE;
	ct->regs.disable = LIOINTC_REG_INTC_DISABLE;
	ct->chip.irq_unmask = irq_gc_unmask_enable_reg;
	ct->chip.irq_mask = irq_gc_mask_disable_reg;
	ct->chip.irq_mask_ack = irq_gc_mask_disable_reg;
	ct->chip.irq_set_type = liointc_set_type;

	gc->mask_cache = 0;
	priv->gc = gc;

	for (i = 0; i < LIOINTC_NUM_PARENT; i++) {
	if (parent_irq[i] <= 0)
	continue;

	priv->handler[i].priv = priv;
	irq_set_chained_handler_and_data(parent_irq[i],
	liointc_chained_handle_irq, &priv->handler[i]);
	}

	return 0;

	out_free_domain:
	irq_domain_remove(domain);
	out_iounmap_isr:
	for (i = 0; i < LIOINTC_NUM_CORES; i++) {
	if (!priv->core_isr[i])
	continue;
	iounmap(priv->core_isr[i]);
	}
	out_iounmap_base:
	iounmap(base);
	out_free_priv:
	kfree(priv);

	return err;
	}

	IRQCHIP_DECLARE(loongson_liointc_1_0, "loongson,liointc-1.0", liointc_of_init);
	IRQCHIP_DECLARE(loongson_liointc_1_0a, "loongson,liointc-1.0a", liointc_of_init);
	IRQCHIP_DECLARE(loongson_liointc_2_0, "loongson,liointc-2.0", liointc_of_init);