/* * 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 a hook for translating device tree interrupt * representation 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 are agnostic to whether or not * we use an open firmware device-tree. We do have references to struct * device_node in two places: in irq_find_host() to find the host matching * a given interrupt controller node, and of course as an argument to its * counterpart domain->ops->match() callback. However, those are treated as * generic pointers by the core and the fact that it's actually a device-node * pointer is purely a convention between callers and implementation. This * code could thus be used on other architectures by replacing those two * by some sort of arch-specific void * "token" used to identify interrupt * controllers. */ #ifndef _LINUX_IRQDOMAIN_H #define _LINUX_IRQDOMAIN_H #include #include #include 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 /** * 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); 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); #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 device_node *of_node; 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), /* * 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), }; #ifdef CONFIG_IRQ_DOMAIN struct irq_domain *__irq_domain_add(struct device_node *of_node, 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_host(struct device_node *node); extern void irq_set_default_host(struct irq_domain *host); /** * 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, size, size, 0, ops, host_data); } 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, 0, max_irq, max_irq, ops, host_data); } 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); } 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, 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 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 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; } 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); } 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); /* 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_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); 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); } 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; } #else /* CONFIG_IRQ_DOMAIN_HIERARCHY */ static inline void irq_domain_activate_irq(struct irq_data *data) { } static inline void irq_domain_deactivate_irq(struct irq_data *data) { } static inline int irq_domain_alloc_irqs(struct irq_domain *domain, unsigned int nr_irqs, int node, void *arg) { return -1; } static inline bool irq_domain_is_hierarchy(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 void irq_domain_activate_irq(struct irq_data *data) { } static inline void irq_domain_deactivate_irq(struct irq_data *data) { } #endif /* !CONFIG_IRQ_DOMAIN */ #endif /* _LINUX_IRQDOMAIN_H */