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https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
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82 lines
2.8 KiB
C
82 lines
2.8 KiB
C
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/*
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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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* irq_domain is expected to be embedded in an interrupt controller's private
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* data structure.
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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/irq.h>
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#ifdef CONFIG_IRQ_DOMAIN
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struct device_node;
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struct irq_domain;
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/**
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* struct irq_domain_ops - Methods for irq_domain objects
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* @to_irq: (optional) given a local hardware irq number, return the linux
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* irq number. If to_irq is not implemented, then the irq_domain
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* will use this translation: irq = (domain->irq_base + hwirq)
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* @dt_translate: 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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struct irq_domain_ops {
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unsigned int (*to_irq)(struct irq_domain *d, unsigned long hwirq);
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#ifdef CONFIG_OF
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int (*dt_translate)(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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#endif /* CONFIG_OF */
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};
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/**
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* struct irq_domain - Hardware interrupt number translation object
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* @list: Element in global irq_domain list.
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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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* @ops: pointer to irq_domain methods
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* @priv: private data pointer for use by owner. Not touched by irq_domain
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* core code.
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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 list;
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unsigned int irq_base;
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unsigned int nr_irq;
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const struct irq_domain_ops *ops;
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void *priv;
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struct device_node *of_node;
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};
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/**
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* irq_domain_to_irq() - Translate from a hardware irq to a linux irq number
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*
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* Returns the linux irq number associated with a hardware irq. By default,
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* the mapping is irq == domain->irq_base + hwirq, but this mapping can
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* be overridden if the irq_domain implements a .to_irq() hook.
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*/
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static inline unsigned int irq_domain_to_irq(struct irq_domain *d,
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unsigned long hwirq)
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{
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return d->ops->to_irq ? d->ops->to_irq(d, hwirq) : d->irq_base + hwirq;
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}
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extern void irq_domain_add(struct irq_domain *domain);
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extern void irq_domain_del(struct irq_domain *domain);
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#endif /* CONFIG_IRQ_DOMAIN */
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#endif /* _LINUX_IRQDOMAIN_H */
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