/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __OF_IRQ_H
#define __OF_IRQ_H

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/irq.h>
#include <linux/irqdomain.h>
#include <linux/ioport.h>
#include <linux/of.h>

typedef int (*of_irq_init_cb_t)(struct device_node *, struct device_node *);

struct of_imap_parser {
	struct device_node *node;
	const __be32 *imap;
	const __be32 *imap_end;
	u32 parent_offset;
};

struct of_imap_item {
	struct of_phandle_args parent_args;
	u32 child_imap_count;
	u32 child_imap[16]; /* Arbitrary size.
			     * Should be #address-cells + #interrupt-cells but
			     * avoid using allocation and so, expect that 16
			     * should be enough
			     */
};

/*
 * If the iterator is exited prematurely (break, goto, return) of_node_put() has
 * to be called on item.parent_args.np
 */
#define for_each_of_imap_item(parser, item) \
	for (; of_imap_parser_one(parser, item);)

/*
 * Workarounds only applied to 32bit powermac machines
 */
#define OF_IMAP_OLDWORLD_MAC	0x00000001
#define OF_IMAP_NO_PHANDLE	0x00000002

#if defined(CONFIG_PPC32) && defined(CONFIG_PPC_PMAC)
extern unsigned int of_irq_workarounds;
extern struct device_node *of_irq_dflt_pic;
int of_irq_parse_oldworld(const struct device_node *device, int index,
			  struct of_phandle_args *out_irq);
#else /* CONFIG_PPC32 && CONFIG_PPC_PMAC */
#define of_irq_workarounds (0)
#define of_irq_dflt_pic (NULL)
static inline int of_irq_parse_oldworld(const struct device_node *device, int index,
				      struct of_phandle_args *out_irq)
{
	return -EINVAL;
}
#endif /* CONFIG_PPC32 && CONFIG_PPC_PMAC */

extern int of_irq_parse_raw(const __be32 *addr, struct of_phandle_args *out_irq);
extern unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data);
extern int of_irq_to_resource(struct device_node *dev, int index,
			      struct resource *r);

#ifdef CONFIG_OF_IRQ
extern void of_irq_init(const struct of_device_id *matches);
extern int of_irq_parse_one(struct device_node *device, int index,
			  struct of_phandle_args *out_irq);
extern int of_irq_count(struct device_node *dev);
extern int of_irq_get(struct device_node *dev, int index);
extern const struct cpumask *of_irq_get_affinity(struct device_node *dev,
						      int index);
extern int of_irq_get_byname(struct device_node *dev, const char *name);
extern int of_irq_to_resource_table(struct device_node *dev,
		struct resource *res, int nr_irqs);
extern struct device_node *of_irq_find_parent(struct device_node *child);
extern int of_imap_parser_init(struct of_imap_parser *parser,
			       struct device_node *node,
			       struct of_imap_item *item);
extern struct of_imap_item *of_imap_parser_one(struct of_imap_parser *parser,
					       struct of_imap_item *item);
extern struct irq_domain *of_msi_get_domain(struct device *dev,
					    const struct device_node *np,
					    enum irq_domain_bus_token token);
extern struct irq_domain *of_msi_map_get_device_domain(struct device *dev,
							u32 id,
							u32 bus_token);
extern void of_msi_configure(struct device *dev, const struct device_node *np);
extern u32 of_msi_xlate(struct device *dev, struct device_node **msi_np, u32 id_in);
#else
static inline void of_irq_init(const struct of_device_id *matches)
{
}
static inline int of_irq_parse_one(struct device_node *device, int index,
				   struct of_phandle_args *out_irq)
{
	return -EINVAL;
}
static inline int of_irq_count(struct device_node *dev)
{
	return 0;
}
static inline int of_irq_get(struct device_node *dev, int index)
{
	return 0;
}
static inline int of_irq_get_byname(struct device_node *dev, const char *name)
{
	return 0;
}
static inline const struct cpumask *of_irq_get_affinity(struct device_node *dev,
							int index)
{
	return NULL;
}
static inline int of_irq_to_resource_table(struct device_node *dev,
					   struct resource *res, int nr_irqs)
{
	return 0;
}
static inline void *of_irq_find_parent(struct device_node *child)
{
	return NULL;
}
static inline int of_imap_parser_init(struct of_imap_parser *parser,
				      struct device_node *node,
				      struct of_imap_item *item)
{
	return -ENOSYS;
}
static inline struct of_imap_item *of_imap_parser_one(struct of_imap_parser *parser,
						      struct of_imap_item *item)
{
	return NULL;
}
static inline struct irq_domain *of_msi_get_domain(struct device *dev,
						   struct device_node *np,
						   enum irq_domain_bus_token token)
{
	return NULL;
}
static inline struct irq_domain *of_msi_map_get_device_domain(struct device *dev,
						u32 id, u32 bus_token)
{
	return NULL;
}
static inline void of_msi_configure(struct device *dev, struct device_node *np)
{
}
static inline u32 of_msi_xlate(struct device *dev, struct device_node **msi_np, u32 id_in)
{
	return id_in;
}
#endif

#if defined(CONFIG_OF_IRQ) || defined(CONFIG_SPARC)
/*
 * irq_of_parse_and_map() is used by all OF enabled platforms; but SPARC
 * implements it differently.  However, the prototype is the same for all,
 * so declare it here regardless of the CONFIG_OF_IRQ setting.
 */
extern unsigned int irq_of_parse_and_map(struct device_node *node, int index);

#else /* !CONFIG_OF && !CONFIG_SPARC */
static inline unsigned int irq_of_parse_and_map(struct device_node *dev,
						int index)
{
	return 0;
}
#endif /* !CONFIG_OF */

#endif /* __OF_IRQ_H */
