xref: /openbmc/linux/include/linux/irqdomain.h (revision 9dbb8e34)

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * irq_domain - IRQ translation domains
 *
 * Translation infrastructure between hw and linux irq numbers.  This is
 * helpful for interrupt controllers to implement mapping between hardware
 * irq numbers and the Linux irq number space.
 *
 * irq_domains also have hooks for translating device tree or other
 * firmware interrupt representations into a hardware irq number that
 * can be mapped back to a Linux irq number without any extra platform
 * support code.
 *
 * Interrupt controller "domain" data structure. This could be defined as a
 * irq domain controller. That is, it handles the mapping between hardware
 * and virtual interrupt numbers for a given interrupt domain. The domain
 * structure is generally created by the PIC code for a given PIC instance
 * (though a domain can cover more than one PIC if they have a flat number
 * model). It's the domain callbacks that are responsible for setting the
 * irq_chip on a given irq_desc after it's been mapped.
 *
 * The host code and data structures use a fwnode_handle pointer to
 * identify the domain. In some cases, and in order to preserve source
 * code compatibility, this fwnode pointer is "upgraded" to a DT
 * device_node. For those firmware infrastructures that do not provide
 * a unique identifier for an interrupt controller, the irq_domain
 * code offers a fwnode allocator.
 */

#ifndef _LINUX_IRQDOMAIN_H
#define _LINUX_IRQDOMAIN_H

#include <linux/types.h>
#include <linux/irqdomain_defs.h>
#include <linux/irqhandler.h>
#include <linux/of.h>
#include <linux/mutex.h>
#include <linux/radix-tree.h>

struct device_node;
struct fwnode_handle;
struct irq_domain;
struct irq_chip;
struct irq_data;
struct irq_desc;
struct cpumask;
struct seq_file;
struct irq_affinity_desc;
struct msi_parent_ops;

#define IRQ_DOMAIN_IRQ_SPEC_PARAMS 16

/**
 * struct irq_fwspec - generic IRQ specifier structure
 *
 * @fwnode:		Pointer to a firmware-specific descriptor
 * @param_count:	Number of device-specific parameters
 * @param:		Device-specific parameters
 *
 * This structure, directly modeled after of_phandle_args, is used to
 * pass a device-specific description of an interrupt.
 */
struct irq_fwspec {
	struct fwnode_handle *fwnode;
	int param_count;
	u32 param[IRQ_DOMAIN_IRQ_SPEC_PARAMS];
};

/* Conversion function from of_phandle_args fields to fwspec  */
void of_phandle_args_to_fwspec(struct device_node *np, const u32 *args,
			       unsigned int count, struct irq_fwspec *fwspec);

/**
 * struct irq_domain_ops - Methods for irq_domain objects
 * @match: Match an interrupt controller device node to a host, returns
 *         1 on a match
 * @map: Create or update a mapping between a virtual irq number and a hw
 *       irq number. This is called only once for a given mapping.
 * @unmap: Dispose of such a mapping
 * @xlate: Given a device tree node and interrupt specifier, decode
 *         the hardware irq number and linux irq type value.
 *
 * Functions below are provided by the driver and called whenever a new mapping
 * is created or an old mapping is disposed. The driver can then proceed to
 * whatever internal data structures management is required. It also needs
 * to setup the irq_desc when returning from map().
 */
struct irq_domain_ops {
	int (*match)(struct irq_domain *d, struct device_node *node,
		     enum irq_domain_bus_token bus_token);
	int (*select)(struct irq_domain *d, struct irq_fwspec *fwspec,
		      enum irq_domain_bus_token bus_token);
	int (*map)(struct irq_domain *d, unsigned int virq, irq_hw_number_t hw);
	void (*unmap)(struct irq_domain *d, unsigned int virq);
	int (*xlate)(struct irq_domain *d, struct device_node *node,
		     const u32 *intspec, unsigned int intsize,
		     unsigned long *out_hwirq, unsigned int *out_type);
#ifdef	CONFIG_IRQ_DOMAIN_HIERARCHY
	/* extended V2 interfaces to support hierarchy irq_domains */
	int (*alloc)(struct irq_domain *d, unsigned int virq,
		     unsigned int nr_irqs, void *arg);
	void (*free)(struct irq_domain *d, unsigned int virq,
		     unsigned int nr_irqs);
	int (*activate)(struct irq_domain *d, struct irq_data *irqd, bool reserve);
	void (*deactivate)(struct irq_domain *d, struct irq_data *irq_data);
	int (*translate)(struct irq_domain *d, struct irq_fwspec *fwspec,
			 unsigned long *out_hwirq, unsigned int *out_type);
#endif
#ifdef CONFIG_GENERIC_IRQ_DEBUGFS
	void (*debug_show)(struct seq_file *m, struct irq_domain *d,
			   struct irq_data *irqd, int ind);
#endif
};

extern const struct irq_domain_ops irq_generic_chip_ops;

struct irq_domain_chip_generic;

/**
 * struct irq_domain - Hardware interrupt number translation object
 * @link:	Element in global irq_domain list.
 * @name:	Name of interrupt domain
 * @ops:	Pointer to irq_domain methods
 * @host_data:	Private data pointer for use by owner.  Not touched by irq_domain
 *		core code.
 * @flags:	Per irq_domain flags
 * @mapcount:	The number of mapped interrupts
 * @mutex:	Domain lock, hierarchical domains use root domain's lock
 * @root:	Pointer to root domain, or containing structure if non-hierarchical
 *
 * Optional elements:
 * @fwnode:	Pointer to firmware node associated with the irq_domain. Pretty easy
 *		to swap it for the of_node via the irq_domain_get_of_node accessor
 * @gc:		Pointer to a list of generic chips. There is a helper function for
 *		setting up one or more generic chips for interrupt controllers
 *		drivers using the generic chip library which uses this pointer.
 * @dev:	Pointer to the device which instantiated the irqdomain
 *		With per device irq domains this is not necessarily the same
 *		as @pm_dev.
 * @pm_dev:	Pointer to a device that can be utilized for power management
 *		purposes related to the irq domain.
 * @parent:	Pointer to parent irq_domain to support hierarchy irq_domains
 * @msi_parent_ops: Pointer to MSI parent domain methods for per device domain init
 *
 * Revmap data, used internally by the irq domain code:
 * @revmap_size:	Size of the linear map table @revmap[]
 * @revmap_tree:	Radix map tree for hwirqs that don't fit in the linear map
 * @revmap:		Linear table of irq_data pointers
 */
struct irq_domain {
	struct list_head		link;
	const char			*name;
	const struct irq_domain_ops	*ops;
	void				*host_data;
	unsigned int			flags;
	unsigned int			mapcount;
	struct mutex			mutex;
	struct irq_domain		*root;

	/* Optional data */
	struct fwnode_handle		*fwnode;
	enum irq_domain_bus_token	bus_token;
	struct irq_domain_chip_generic	*gc;
	struct device			*dev;
	struct device			*pm_dev;
#ifdef	CONFIG_IRQ_DOMAIN_HIERARCHY
	struct irq_domain		*parent;
#endif
#ifdef CONFIG_GENERIC_MSI_IRQ
	const struct msi_parent_ops	*msi_parent_ops;
#endif

	/* reverse map data. The linear map gets appended to the irq_domain */
	irq_hw_number_t			hwirq_max;
	unsigned int			revmap_size;
	struct radix_tree_root		revmap_tree;
	struct irq_data __rcu		*revmap[];
};

/* Irq domain flags */
enum {
	/* Irq domain is hierarchical */
	IRQ_DOMAIN_FLAG_HIERARCHY	= (1 << 0),

	/* Irq domain name was allocated in __irq_domain_add() */
	IRQ_DOMAIN_NAME_ALLOCATED	= (1 << 1),

	/* Irq domain is an IPI domain with virq per cpu */
	IRQ_DOMAIN_FLAG_IPI_PER_CPU	= (1 << 2),

	/* Irq domain is an IPI domain with single virq */
	IRQ_DOMAIN_FLAG_IPI_SINGLE	= (1 << 3),

	/* Irq domain implements MSIs */
	IRQ_DOMAIN_FLAG_MSI		= (1 << 4),

	/*
	 * Irq domain implements isolated MSI, see msi_device_has_isolated_msi()
	 */
	IRQ_DOMAIN_FLAG_ISOLATED_MSI	= (1 << 5),

	/* Irq domain doesn't translate anything */
	IRQ_DOMAIN_FLAG_NO_MAP		= (1 << 6),

	/* Irq domain is a MSI parent domain */
	IRQ_DOMAIN_FLAG_MSI_PARENT	= (1 << 8),

	/* Irq domain is a MSI device domain */
	IRQ_DOMAIN_FLAG_MSI_DEVICE	= (1 << 9),

	/*
	 * Flags starting from IRQ_DOMAIN_FLAG_NONCORE are reserved
	 * for implementation specific purposes and ignored by the
	 * core code.
	 */
	IRQ_DOMAIN_FLAG_NONCORE		= (1 << 16),
};

static inline struct device_node *irq_domain_get_of_node(struct irq_domain *d)
{
	return to_of_node(d->fwnode);
}

static inline void irq_domain_set_pm_device(struct irq_domain *d,
					    struct device *dev)
{
	if (d)
		d->pm_dev = dev;
}

#ifdef CONFIG_IRQ_DOMAIN
struct fwnode_handle *__irq_domain_alloc_fwnode(unsigned int type, int id,
						const char *name, phys_addr_t *pa);

enum {
	IRQCHIP_FWNODE_REAL,
	IRQCHIP_FWNODE_NAMED,
	IRQCHIP_FWNODE_NAMED_ID,
};

static inline
struct fwnode_handle *irq_domain_alloc_named_fwnode(const char *name)
{
	return __irq_domain_alloc_fwnode(IRQCHIP_FWNODE_NAMED, 0, name, NULL);
}

static inline
struct fwnode_handle *irq_domain_alloc_named_id_fwnode(const char *name, int id)
{
	return __irq_domain_alloc_fwnode(IRQCHIP_FWNODE_NAMED_ID, id, name,
					 NULL);
}

static inline struct fwnode_handle *irq_domain_alloc_fwnode(phys_addr_t *pa)
{
	return __irq_domain_alloc_fwnode(IRQCHIP_FWNODE_REAL, 0, NULL, pa);
}

void irq_domain_free_fwnode(struct fwnode_handle *fwnode);
struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, unsigned int size,
				    irq_hw_number_t hwirq_max, int direct_max,
				    const struct irq_domain_ops *ops,
				    void *host_data);
struct irq_domain *irq_domain_create_simple(struct fwnode_handle *fwnode,
					    unsigned int size,
					    unsigned int first_irq,
					    const struct irq_domain_ops *ops,
					    void *host_data);
struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
					 unsigned int size,
					 unsigned int first_irq,
					 irq_hw_number_t first_hwirq,
					 const struct irq_domain_ops *ops,
					 void *host_data);
struct irq_domain *irq_domain_create_legacy(struct fwnode_handle *fwnode,
					    unsigned int size,
					    unsigned int first_irq,
					    irq_hw_number_t first_hwirq,
					    const struct irq_domain_ops *ops,
					    void *host_data);
extern struct irq_domain *irq_find_matching_fwspec(struct irq_fwspec *fwspec,
						   enum irq_domain_bus_token bus_token);
extern void irq_set_default_host(struct irq_domain *host);
extern struct irq_domain *irq_get_default_host(void);
extern int irq_domain_alloc_descs(int virq, unsigned int nr_irqs,
				  irq_hw_number_t hwirq, int node,
				  const struct irq_affinity_desc *affinity);

static inline struct fwnode_handle *of_node_to_fwnode(struct device_node *node)
{
	return node ? &node->fwnode : NULL;
}

extern const struct fwnode_operations irqchip_fwnode_ops;

static inline bool is_fwnode_irqchip(struct fwnode_handle *fwnode)
{
	return fwnode && fwnode->ops == &irqchip_fwnode_ops;
}

extern void irq_domain_update_bus_token(struct irq_domain *domain,
					enum irq_domain_bus_token bus_token);

static inline
struct irq_domain *irq_find_matching_fwnode(struct fwnode_handle *fwnode,
					    enum irq_domain_bus_token bus_token)
{
	struct irq_fwspec fwspec = {
		.fwnode = fwnode,
	};

	return irq_find_matching_fwspec(&fwspec, bus_token);
}

static inline struct irq_domain *irq_find_matching_host(struct device_node *node,
							enum irq_domain_bus_token bus_token)
{
	return irq_find_matching_fwnode(of_node_to_fwnode(node), bus_token);
}

static inline struct irq_domain *irq_find_host(struct device_node *node)
{
	struct irq_domain *d;

	d = irq_find_matching_host(node, DOMAIN_BUS_WIRED);
	if (!d)
		d = irq_find_matching_host(node, DOMAIN_BUS_ANY);

	return d;
}

static inline struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
						       unsigned int size,
						       unsigned int first_irq,
						       const struct irq_domain_ops *ops,
						       void *host_data)
{
	return irq_domain_create_simple(of_node_to_fwnode(of_node), size, first_irq, ops, host_data);
}

/**
 * irq_domain_add_linear() - Allocate and register a linear revmap irq_domain.
 * @of_node: pointer to interrupt controller's device tree node.
 * @size: Number of interrupts in the domain.
 * @ops: map/unmap domain callbacks
 * @host_data: Controller private data pointer
 */
static inline struct irq_domain *irq_domain_add_linear(struct device_node *of_node,
					 unsigned int size,
					 const struct irq_domain_ops *ops,
					 void *host_data)
{
	return __irq_domain_add(of_node_to_fwnode(of_node), size, size, 0, ops, host_data);
}

#ifdef CONFIG_IRQ_DOMAIN_NOMAP
static inline struct irq_domain *irq_domain_add_nomap(struct device_node *of_node,
					 unsigned int max_irq,
					 const struct irq_domain_ops *ops,
					 void *host_data)
{
	return __irq_domain_add(of_node_to_fwnode(of_node), 0, max_irq, max_irq, ops, host_data);
}

extern unsigned int irq_create_direct_mapping(struct irq_domain *host);
#endif

static inline struct irq_domain *irq_domain_add_tree(struct device_node *of_node,
					 const struct irq_domain_ops *ops,
					 void *host_data)
{
	return __irq_domain_add(of_node_to_fwnode(of_node), 0, ~0, 0, ops, host_data);
}

static inline struct irq_domain *irq_domain_create_linear(struct fwnode_handle *fwnode,
					 unsigned int size,
					 const struct irq_domain_ops *ops,
					 void *host_data)
{
	return __irq_domain_add(fwnode, size, size, 0, ops, host_data);
}

static inline struct irq_domain *irq_domain_create_tree(struct fwnode_handle *fwnode,
					 const struct irq_domain_ops *ops,
					 void *host_data)
{
	return __irq_domain_add(fwnode, 0, ~0, 0, ops, host_data);
}

extern void irq_domain_remove(struct irq_domain *host);

extern int irq_domain_associate(struct irq_domain *domain, unsigned int irq,
					irq_hw_number_t hwirq);
extern void irq_domain_associate_many(struct irq_domain *domain,
				      unsigned int irq_base,
				      irq_hw_number_t hwirq_base, int count);

extern unsigned int irq_create_mapping_affinity(struct irq_domain *host,
				      irq_hw_number_t hwirq,
				      const struct irq_affinity_desc *affinity);
extern unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec);
extern void irq_dispose_mapping(unsigned int virq);

static inline unsigned int irq_create_mapping(struct irq_domain *host,
					      irq_hw_number_t hwirq)
{
	return irq_create_mapping_affinity(host, hwirq, NULL);
}

extern struct irq_desc *__irq_resolve_mapping(struct irq_domain *domain,
					      irq_hw_number_t hwirq,
					      unsigned int *irq);

static inline struct irq_desc *irq_resolve_mapping(struct irq_domain *domain,
						   irq_hw_number_t hwirq)
{
	return __irq_resolve_mapping(domain, hwirq, NULL);
}

/**
 * irq_find_mapping() - Find a linux irq from a hw irq number.
 * @domain: domain owning this hardware interrupt
 * @hwirq: hardware irq number in that domain space
 */
static inline unsigned int irq_find_mapping(struct irq_domain *domain,
					    irq_hw_number_t hwirq)
{
	unsigned int irq;

	if (__irq_resolve_mapping(domain, hwirq, &irq))
		return irq;

	return 0;
}

static inline unsigned int irq_linear_revmap(struct irq_domain *domain,
					     irq_hw_number_t hwirq)
{
	return irq_find_mapping(domain, hwirq);
}

extern const struct irq_domain_ops irq_domain_simple_ops;

/* stock xlate functions */
int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
			const u32 *intspec, unsigned int intsize,
			irq_hw_number_t *out_hwirq, unsigned int *out_type);
int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
			const u32 *intspec, unsigned int intsize,
			irq_hw_number_t *out_hwirq, unsigned int *out_type);
int irq_domain_xlate_onetwocell(struct irq_domain *d, struct device_node *ctrlr,
			const u32 *intspec, unsigned int intsize,
			irq_hw_number_t *out_hwirq, unsigned int *out_type);

int irq_domain_translate_twocell(struct irq_domain *d,
				 struct irq_fwspec *fwspec,
				 unsigned long *out_hwirq,
				 unsigned int *out_type);

int irq_domain_translate_onecell(struct irq_domain *d,
				 struct irq_fwspec *fwspec,
				 unsigned long *out_hwirq,
				 unsigned int *out_type);

/* IPI functions */
int irq_reserve_ipi(struct irq_domain *domain, const struct cpumask *dest);
int irq_destroy_ipi(unsigned int irq, const struct cpumask *dest);

/* V2 interfaces to support hierarchy IRQ domains. */
extern struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
						unsigned int virq);
extern void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
				irq_hw_number_t hwirq,
				const struct irq_chip *chip,
				void *chip_data, irq_flow_handler_t handler,
				void *handler_data, const char *handler_name);
extern void irq_domain_reset_irq_data(struct irq_data *irq_data);
#ifdef	CONFIG_IRQ_DOMAIN_HIERARCHY
extern struct irq_domain *irq_domain_create_hierarchy(struct irq_domain *parent,
			unsigned int flags, unsigned int size,
			struct fwnode_handle *fwnode,
			const struct irq_domain_ops *ops, void *host_data);

static inline struct irq_domain *irq_domain_add_hierarchy(struct irq_domain *parent,
					    unsigned int flags,
					    unsigned int size,
					    struct device_node *node,
					    const struct irq_domain_ops *ops,
					    void *host_data)
{
	return irq_domain_create_hierarchy(parent, flags, size,
					   of_node_to_fwnode(node),
					   ops, host_data);
}

extern int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base,
				   unsigned int nr_irqs, int node, void *arg,
				   bool realloc,
				   const struct irq_affinity_desc *affinity);
extern void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs);
extern int irq_domain_activate_irq(struct irq_data *irq_data, bool early);
extern void irq_domain_deactivate_irq(struct irq_data *irq_data);

static inline int irq_domain_alloc_irqs(struct irq_domain *domain,
			unsigned int nr_irqs, int node, void *arg)
{
	return __irq_domain_alloc_irqs(domain, -1, nr_irqs, node, arg, false,
				       NULL);
}

extern int irq_domain_alloc_irqs_hierarchy(struct irq_domain *domain,
					   unsigned int irq_base,
					   unsigned int nr_irqs, void *arg);
extern int irq_domain_set_hwirq_and_chip(struct irq_domain *domain,
					 unsigned int virq,
					 irq_hw_number_t hwirq,
					 const struct irq_chip *chip,
					 void *chip_data);
extern void irq_domain_free_irqs_common(struct irq_domain *domain,
					unsigned int virq,
					unsigned int nr_irqs);
extern void irq_domain_free_irqs_top(struct irq_domain *domain,
				     unsigned int virq, unsigned int nr_irqs);

extern int irq_domain_push_irq(struct irq_domain *domain, int virq, void *arg);
extern int irq_domain_pop_irq(struct irq_domain *domain, int virq);

extern int irq_domain_alloc_irqs_parent(struct irq_domain *domain,
					unsigned int irq_base,
					unsigned int nr_irqs, void *arg);

extern void irq_domain_free_irqs_parent(struct irq_domain *domain,
					unsigned int irq_base,
					unsigned int nr_irqs);

extern int irq_domain_disconnect_hierarchy(struct irq_domain *domain,
					   unsigned int virq);

static inline bool irq_domain_is_hierarchy(struct irq_domain *domain)
{
	return domain->flags & IRQ_DOMAIN_FLAG_HIERARCHY;
}

static inline bool irq_domain_is_ipi(struct irq_domain *domain)
{
	return domain->flags &
		(IRQ_DOMAIN_FLAG_IPI_PER_CPU | IRQ_DOMAIN_FLAG_IPI_SINGLE);
}

static inline bool irq_domain_is_ipi_per_cpu(struct irq_domain *domain)
{
	return domain->flags & IRQ_DOMAIN_FLAG_IPI_PER_CPU;
}

static inline bool irq_domain_is_ipi_single(struct irq_domain *domain)
{
	return domain->flags & IRQ_DOMAIN_FLAG_IPI_SINGLE;
}

static inline bool irq_domain_is_msi(struct irq_domain *domain)
{
	return domain->flags & IRQ_DOMAIN_FLAG_MSI;
}

static inline bool irq_domain_is_msi_parent(struct irq_domain *domain)
{
	return domain->flags & IRQ_DOMAIN_FLAG_MSI_PARENT;
}

static inline bool irq_domain_is_msi_device(struct irq_domain *domain)
{
	return domain->flags & IRQ_DOMAIN_FLAG_MSI_DEVICE;
}

#else	/* CONFIG_IRQ_DOMAIN_HIERARCHY */
static inline int irq_domain_alloc_irqs(struct irq_domain *domain,
			unsigned int nr_irqs, int node, void *arg)
{
	return -1;
}

static inline void irq_domain_free_irqs(unsigned int virq,
					unsigned int nr_irqs) { }

static inline bool irq_domain_is_hierarchy(struct irq_domain *domain)
{
	return false;
}

static inline bool irq_domain_is_ipi(struct irq_domain *domain)
{
	return false;
}

static inline bool irq_domain_is_ipi_per_cpu(struct irq_domain *domain)
{
	return false;
}

static inline bool irq_domain_is_ipi_single(struct irq_domain *domain)
{
	return false;
}

static inline bool irq_domain_is_msi(struct irq_domain *domain)
{
	return false;
}

static inline bool irq_domain_is_msi_parent(struct irq_domain *domain)
{
	return false;
}

static inline bool irq_domain_is_msi_device(struct irq_domain *domain)
{
	return false;
}

#endif	/* CONFIG_IRQ_DOMAIN_HIERARCHY */

#else /* CONFIG_IRQ_DOMAIN */
static inline void irq_dispose_mapping(unsigned int virq) { }
static inline struct irq_domain *irq_find_matching_fwnode(
	struct fwnode_handle *fwnode, enum irq_domain_bus_token bus_token)
{
	return NULL;
}
#endif /* !CONFIG_IRQ_DOMAIN */

#endif /* _LINUX_IRQDOMAIN_H */