Release 4.7 include/linux/irqdomain.h

/*
 * 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/irqhandler.h>
#include <linux/of.h>
#include <linux/radix-tree.h>

struct device_node;
struct irq_domain;
struct of_device_id;
struct irq_chip;
struct irq_data;

/* Number of irqs reserved for a legacy isa controller */

#define NUM_ISA_INTERRUPTS	16


#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];
};

/*
 * Should several domains have the same device node, but serve
 * different purposes (for example one domain is for PCI/MSI, and the
 * other for wired IRQs), they can be distinguished using a
 * bus-specific token. Most domains are expected to only carry
 * DOMAIN_BUS_ANY.
 */

enum irq_domain_bus_token {
	
DOMAIN_BUS_ANY		= 0,
	
DOMAIN_BUS_WIRED,
	
DOMAIN_BUS_PCI_MSI,
	
DOMAIN_BUS_PLATFORM_MSI,
	
DOMAIN_BUS_NEXUS,
	
DOMAIN_BUS_IPI,
	
DOMAIN_BUS_FSL_MC_MSI,
};

/**
 * 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);
	
void (*activate)(struct irq_domain *d, struct irq_data *irq_data);
	
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
};

extern 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: host per irq_domain flags
 *
 * Optional elements
 * @of_node: Pointer to device tree nodes associated with the irq_domain. Used
 *           when decoding device tree interrupt specifiers.
 * @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.
 * @parent: Pointer to parent irq_domain to support hierarchy irq_domains
 *
 * Revmap data, used internally by irq_domain
 * @revmap_direct_max_irq: The largest hwirq that can be set for controllers that
 *                         support direct mapping
 * @revmap_size: Size of the linear map table @linear_revmap[]
 * @revmap_tree: Radix map tree for hwirqs that don't fit in the linear map
 * @linear_revmap: Linear table of hwirq->virq reverse mappings
 */

struct irq_domain {
	
struct list_head link;
	
const char *name;
	
const struct irq_domain_ops *ops;
	
void *host_data;
	
unsigned int flags;

	/* Optional data */
	
struct fwnode_handle *fwnode;
	
enum irq_domain_bus_token bus_token;
	
struct irq_domain_chip_generic *gc;
#ifdef	CONFIG_IRQ_DOMAIN_HIERARCHY
	
struct irq_domain *parent;
#endif

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

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

	/* Core calls alloc/free recursive through the domain hierarchy. */
	
IRQ_DOMAIN_FLAG_AUTO_RECURSIVE	= (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),

	/*
         * 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);
}

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#ifdef CONFIG_IRQ_DOMAIN
struct fwnode_handle *irq_domain_alloc_fwnode(void *data);
void irq_domain_free_fwnode(struct fwnode_handle *fwnode);
struct irq_domain *__irq_domain_add(struct fwnode_handle *fwnode, 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_add_simple(struct device_node *of_node,
					 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);
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 int irq_domain_alloc_descs(int virq, unsigned int nr_irqs,
				  irq_hw_number_t hwirq, int node);



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

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

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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);
}

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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);
}

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static inline struct irq_domain *irq_find_host(struct device_node *node)
{
	return irq_find_matching_host(node, DOMAIN_BUS_ANY);
}

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/**
 * 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);
}
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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);
}
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static inline struct irq_domain *irq_domain_add_legacy_isa(
				struct device_node *of_node,
				const struct irq_domain_ops *ops,
				void *host_data)
{
	return irq_domain_add_legacy(of_node, NUM_ISA_INTERRUPTS, 0, 0, ops,
				     host_data);
}
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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);
}

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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);
}

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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);
}

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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 void irq_domain_disassociate(struct irq_domain *domain,
				    unsigned int irq);

extern unsigned int irq_create_mapping(struct irq_domain *host,
				       irq_hw_number_t hwirq);
extern unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec);
extern void irq_dispose_mapping(unsigned int virq);

/**
 * irq_linear_revmap() - Find a linux irq from a hw irq number.
 * @domain: domain owning this hardware interrupt
 * @hwirq: hardware irq number in that domain space
 *
 * This is a fast path alternative to irq_find_mapping() that can be
 * called directly by irq controller code to save a handful of
 * instructions. It is always safe to call, but won't find irqs mapped
 * using the radix tree.
 */


static inline unsigned int irq_linear_revmap(struct irq_domain *domain,
					     irq_hw_number_t hwirq)
{
	return hwirq < domain->revmap_size ? domain->linear_revmap[hwirq] : 0;
}
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extern unsigned int irq_find_mapping(struct irq_domain *host,
				     irq_hw_number_t hwirq);
extern unsigned int irq_create_direct_mapping(struct irq_domain *host);
extern int irq_create_strict_mappings(struct irq_domain *domain,
				      unsigned int irq_base,
				      irq_hw_number_t hwirq_base, int count);



static inline int irq_create_identity_mapping(struct irq_domain *host,
					      irq_hw_number_t hwirq)
{
	return irq_create_strict_mappings(host, hwirq, hwirq, 1);
}

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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);

/* 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, struct irq_chip *chip,
				void *chip_data, irq_flow_handler_t handler,
				void *handler_data, const char *handler_name);
#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);
}

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extern int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base,
				   unsigned int nr_irqs, int node, void *arg,
				   bool realloc);
extern void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs);
extern void irq_domain_activate_irq(struct irq_data *irq_data);
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);
}

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extern int irq_domain_alloc_irqs_recursive(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,
					 struct irq_chip *chip,
					 void *chip_data);
extern void irq_domain_reset_irq_data(struct irq_data *irq_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_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);



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

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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);
}

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

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


static inline void irq_domain_activate_irq(struct irq_data *data) { }
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static inline void irq_domain_deactivate_irq(struct irq_data *data) { }
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static inline int irq_domain_alloc_irqs(struct irq_domain *domain,
			unsigned int nr_irqs, int node, void *arg)
{
	return -1;
}

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

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

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

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static inline bool irq_domain_is_ipi_single(struct irq_domain *domain)
{
	return false;
}
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#endif	/* CONFIG_IRQ_DOMAIN_HIERARCHY */

#else /* CONFIG_IRQ_DOMAIN */


static inline void irq_dispose_mapping(unsigned int virq) { }
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Commits
CommitProp
grant likely
grant likely
10
100.00%
1
100.00%
Total
10
100.00%
1
100.00%



static inline void irq_domain_activate_irq(struct irq_data *data) { }
Contributors
Person
Tokens
Prop
Commits
CommitProp
jiang liu
jiang liu
11
100.00%
1
100.00%
Total
11
100.00%
1
100.00%



static inline void irq_domain_deactivate_irq(struct irq_data *data) { }
Contributors
Person
Tokens
Prop
Commits
CommitProp
jiang liu
jiang liu
11
100.00%
1
100.00%
Total
11
100.00%
1
100.00%



static inline struct irq_domain *irq_find_matching_fwnode(
	struct fwnode_handle *fwnode, enum irq_domain_bus_token bus_token)
{
	return NULL;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
suravee suthikulpanit
suravee suthikulpanit
21
100.00%
1
100.00%
Total
21
100.00%
1
100.00%

#endif /* !CONFIG_IRQ_DOMAIN */

#endif /* _LINUX_IRQDOMAIN_H */
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
grant likely
grant likely
709
35.52%
18
33.33%
jiang liu
jiang liu
530
26.55%
5
9.26%
marc zyngier
marc zyngier
450
22.55%
16
29.63%
qais yousef
qais yousef
167
8.37%
4
7.41%
suravee suthikulpanit
suravee suthikulpanit
42
2.10%
2
3.70%
stefan agner
stefan agner
38
1.90%
1
1.85%
mark brown
mark brown
23
1.15%
1
1.85%
thomas gleixner
thomas gleixner
13
0.65%
1
1.85%
paul mundt
paul mundt
10
0.50%
1
1.85%
matt redfearn
matt redfearn
7
0.35%
2
3.70%
jamie iles
jamie iles
5
0.25%
1
1.85%
linus torvalds
linus torvalds
1
0.05%
1
1.85%
j. german rivera
j. german rivera
1
0.05%
1
1.85%
Total
1996
100.00%
54
100.00%
  
Directory: include/linux

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