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Diffstat (limited to 'kernel/include/linux/irqdomain.h')
| -rw-r--r-- | kernel/include/linux/irqdomain.h | 328 |
1 files changed, 328 insertions, 0 deletions
diff --git a/kernel/include/linux/irqdomain.h b/kernel/include/linux/irqdomain.h new file mode 100644 index 000000000..676d7306a --- /dev/null +++ b/kernel/include/linux/irqdomain.h @@ -0,0 +1,328 @@ +/* + * 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 <linux/types.h> +#include <linux/irqhandler.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 + +/** + * 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); +#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_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); +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 */ |