2 * irq_domain - IRQ translation domains
4 * Translation infrastructure between hw and linux irq numbers. This is
5 * helpful for interrupt controllers to implement mapping between hardware
6 * irq numbers and the Linux irq number space.
8 * irq_domains also have a hook for translating device tree interrupt
9 * representation into a hardware irq number that can be mapped back to a
10 * Linux irq number without any extra platform support code.
12 * irq_domain is expected to be embedded in an interrupt controller's private
15 #ifndef _LINUX_IRQDOMAIN_H
16 #define _LINUX_IRQDOMAIN_H
18 #include <linux/irq.h>
19 #include <linux/mod_devicetable.h>
21 #ifdef CONFIG_IRQ_DOMAIN
26 * struct irq_domain_ops - Methods for irq_domain objects
27 * @to_irq: (optional) given a local hardware irq number, return the linux
28 * irq number. If to_irq is not implemented, then the irq_domain
29 * will use this translation: irq = (domain->irq_base + hwirq)
30 * @dt_translate: Given a device tree node and interrupt specifier, decode
31 * the hardware irq number and linux irq type value.
33 struct irq_domain_ops {
34 unsigned int (*to_irq)(struct irq_domain *d, unsigned long hwirq);
37 int (*dt_translate)(struct irq_domain *d, struct device_node *node,
38 const u32 *intspec, unsigned int intsize,
39 unsigned long *out_hwirq, unsigned int *out_type);
40 #endif /* CONFIG_OF */
44 * struct irq_domain - Hardware interrupt number translation object
45 * @list: Element in global irq_domain list.
46 * @irq_base: Start of irq_desc range assigned to the irq_domain. The creator
47 * of the irq_domain is responsible for allocating the array of
48 * irq_desc structures.
49 * @nr_irq: Number of irqs managed by the irq domain
50 * @ops: pointer to irq_domain methods
51 * @priv: private data pointer for use by owner. Not touched by irq_domain
53 * @of_node: (optional) Pointer to device tree nodes associated with the
54 * irq_domain. Used when decoding device tree interrupt specifiers.
57 struct list_head list;
58 unsigned int irq_base;
60 const struct irq_domain_ops *ops;
62 struct device_node *of_node;
66 * irq_domain_to_irq() - Translate from a hardware irq to a linux irq number
68 * Returns the linux irq number associated with a hardware irq. By default,
69 * the mapping is irq == domain->irq_base + hwirq, but this mapping can
70 * be overridden if the irq_domain implements a .to_irq() hook.
72 static inline unsigned int irq_domain_to_irq(struct irq_domain *d,
75 return d->ops->to_irq ? d->ops->to_irq(d, hwirq) : d->irq_base + hwirq;
78 extern void irq_domain_add(struct irq_domain *domain);
79 extern void irq_domain_del(struct irq_domain *domain);
80 #endif /* CONFIG_IRQ_DOMAIN */
82 #if defined(CONFIG_IRQ_DOMAIN) && defined(CONFIG_OF_IRQ)
83 extern void irq_domain_add_simple(struct device_node *controller, int irq_base);
84 extern void irq_domain_generate_simple(const struct of_device_id *match,
85 u64 phys_base, unsigned int irq_start);
86 #else /* CONFIG_IRQ_DOMAIN && CONFIG_OF_IRQ */
87 static inline void irq_domain_generate_simple(const struct of_device_id *match,
88 u64 phys_base, unsigned int irq_start) { }
89 #endif /* CONFIG_IRQ_DOMAIN && CONFIG_OF_IRQ */
91 #endif /* _LINUX_IRQDOMAIN_H */