206 строки
7.8 KiB
C
206 строки
7.8 KiB
C
/*
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* irq_domain - IRQ translation domains
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*
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* Translation infrastructure between hw and linux irq numbers. This is
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* helpful for interrupt controllers to implement mapping between hardware
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* irq numbers and the Linux irq number space.
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*
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* irq_domains also have a hook for translating device tree interrupt
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* representation into a hardware irq number that can be mapped back to a
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* Linux irq number without any extra platform support code.
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*
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* Interrupt controller "domain" data structure. This could be defined as a
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* irq domain controller. That is, it handles the mapping between hardware
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* and virtual interrupt numbers for a given interrupt domain. The domain
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* structure is generally created by the PIC code for a given PIC instance
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* (though a domain can cover more than one PIC if they have a flat number
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* model). It's the domain callbacks that are responsible for setting the
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* irq_chip on a given irq_desc after it's been mapped.
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*
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* The host code and data structures are agnostic to whether or not
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* we use an open firmware device-tree. We do have references to struct
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* device_node in two places: in irq_find_host() to find the host matching
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* a given interrupt controller node, and of course as an argument to its
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* counterpart domain->ops->match() callback. However, those are treated as
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* generic pointers by the core and the fact that it's actually a device-node
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* pointer is purely a convention between callers and implementation. This
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* code could thus be used on other architectures by replacing those two
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* by some sort of arch-specific void * "token" used to identify interrupt
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* controllers.
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*/
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#ifndef _LINUX_IRQDOMAIN_H
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#define _LINUX_IRQDOMAIN_H
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#include <linux/types.h>
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#include <linux/radix-tree.h>
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struct device_node;
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struct irq_domain;
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struct of_device_id;
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/* Number of irqs reserved for a legacy isa controller */
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#define NUM_ISA_INTERRUPTS 16
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/**
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* struct irq_domain_ops - Methods for irq_domain objects
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* @match: Match an interrupt controller device node to a host, returns
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* 1 on a match
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* @map: Create or update a mapping between a virtual irq number and a hw
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* irq number. This is called only once for a given mapping.
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* @unmap: Dispose of such a mapping
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* @xlate: Given a device tree node and interrupt specifier, decode
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* the hardware irq number and linux irq type value.
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*
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* Functions below are provided by the driver and called whenever a new mapping
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* is created or an old mapping is disposed. The driver can then proceed to
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* whatever internal data structures management is required. It also needs
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* to setup the irq_desc when returning from map().
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*/
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struct irq_domain_ops {
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int (*match)(struct irq_domain *d, struct device_node *node);
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int (*map)(struct irq_domain *d, unsigned int virq, irq_hw_number_t hw);
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void (*unmap)(struct irq_domain *d, unsigned int virq);
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int (*xlate)(struct irq_domain *d, struct device_node *node,
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const u32 *intspec, unsigned int intsize,
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unsigned long *out_hwirq, unsigned int *out_type);
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};
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/**
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* struct irq_domain - Hardware interrupt number translation object
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* @link: Element in global irq_domain list.
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* @revmap_type: Method used for reverse mapping hwirq numbers to linux irq. This
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* will be one of the IRQ_DOMAIN_MAP_* values.
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* @revmap_data: Revmap method specific data.
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* @ops: pointer to irq_domain methods
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* @host_data: private data pointer for use by owner. Not touched by irq_domain
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* core code.
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* @irq_base: Start of irq_desc range assigned to the irq_domain. The creator
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* of the irq_domain is responsible for allocating the array of
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* irq_desc structures.
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* @nr_irq: Number of irqs managed by the irq domain
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* @hwirq_base: Starting number for hwirqs managed by the irq domain
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* @of_node: (optional) Pointer to device tree nodes associated with the
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* irq_domain. Used when decoding device tree interrupt specifiers.
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*/
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struct irq_domain {
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struct list_head link;
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/* type of reverse mapping_technique */
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unsigned int revmap_type;
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union {
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struct {
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unsigned int size;
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unsigned int first_irq;
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irq_hw_number_t first_hwirq;
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} legacy;
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struct {
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unsigned int size;
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unsigned int *revmap;
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} linear;
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struct {
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unsigned int max_irq;
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} nomap;
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struct radix_tree_root tree;
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} revmap_data;
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const struct irq_domain_ops *ops;
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void *host_data;
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irq_hw_number_t inval_irq;
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/* Optional device node pointer */
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struct device_node *of_node;
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};
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#ifdef CONFIG_IRQ_DOMAIN
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struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
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unsigned int size,
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unsigned int first_irq,
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const struct irq_domain_ops *ops,
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void *host_data);
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struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
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unsigned int size,
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unsigned int first_irq,
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irq_hw_number_t first_hwirq,
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const struct irq_domain_ops *ops,
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void *host_data);
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struct irq_domain *irq_domain_add_linear(struct device_node *of_node,
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unsigned int size,
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const struct irq_domain_ops *ops,
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void *host_data);
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struct irq_domain *irq_domain_add_nomap(struct device_node *of_node,
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unsigned int max_irq,
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const struct irq_domain_ops *ops,
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void *host_data);
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struct irq_domain *irq_domain_add_tree(struct device_node *of_node,
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const struct irq_domain_ops *ops,
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void *host_data);
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extern struct irq_domain *irq_find_host(struct device_node *node);
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extern void irq_set_default_host(struct irq_domain *host);
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static inline struct irq_domain *irq_domain_add_legacy_isa(
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struct device_node *of_node,
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const struct irq_domain_ops *ops,
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void *host_data)
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{
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return irq_domain_add_legacy(of_node, NUM_ISA_INTERRUPTS, 0, 0, ops,
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host_data);
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}
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extern void irq_domain_remove(struct irq_domain *host);
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extern int irq_domain_associate_many(struct irq_domain *domain,
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unsigned int irq_base,
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irq_hw_number_t hwirq_base, int count);
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static inline int irq_domain_associate(struct irq_domain *domain, unsigned int irq,
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irq_hw_number_t hwirq)
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{
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return irq_domain_associate_many(domain, irq, hwirq, 1);
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}
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extern unsigned int irq_create_mapping(struct irq_domain *host,
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irq_hw_number_t hwirq);
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extern void irq_dispose_mapping(unsigned int virq);
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extern unsigned int irq_find_mapping(struct irq_domain *host,
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irq_hw_number_t hwirq);
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extern unsigned int irq_create_direct_mapping(struct irq_domain *host);
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extern int irq_create_strict_mappings(struct irq_domain *domain,
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unsigned int irq_base,
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irq_hw_number_t hwirq_base, int count);
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static inline int irq_create_identity_mapping(struct irq_domain *host,
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irq_hw_number_t hwirq)
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{
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return irq_create_strict_mappings(host, hwirq, hwirq, 1);
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}
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extern unsigned int irq_linear_revmap(struct irq_domain *host,
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irq_hw_number_t hwirq);
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extern const struct irq_domain_ops irq_domain_simple_ops;
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/* stock xlate functions */
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int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
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const u32 *intspec, unsigned int intsize,
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irq_hw_number_t *out_hwirq, unsigned int *out_type);
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int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
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const u32 *intspec, unsigned int intsize,
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irq_hw_number_t *out_hwirq, unsigned int *out_type);
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int irq_domain_xlate_onetwocell(struct irq_domain *d, struct device_node *ctrlr,
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const u32 *intspec, unsigned int intsize,
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irq_hw_number_t *out_hwirq, unsigned int *out_type);
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#if defined(CONFIG_OF_IRQ)
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extern void irq_domain_generate_simple(const struct of_device_id *match,
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u64 phys_base, unsigned int irq_start);
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#else /* CONFIG_OF_IRQ */
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static inline void irq_domain_generate_simple(const struct of_device_id *match,
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u64 phys_base, unsigned int irq_start) { }
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#endif /* !CONFIG_OF_IRQ */
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#else /* CONFIG_IRQ_DOMAIN */
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static inline void irq_dispose_mapping(unsigned int virq) { }
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#endif /* !CONFIG_IRQ_DOMAIN */
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#endif /* _LINUX_IRQDOMAIN_H */
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