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c87fb57346
irqdomain support is used in interrupt controller drivers that may not have device tree support but only need the basic HW->Linux irq translation. Rather than having each of these implement their own IRQ domain, allow them to use the simple ops. Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Rob Herring <robherring2@gmail.com> Cc: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Jamie Iles <jamie@jamieiles.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
108 lines
3.9 KiB
C
108 lines
3.9 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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* 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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#include <linux/mod_devicetable.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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* @hwirq_base: Starting number for hwirqs 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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unsigned int hwirq_base;
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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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if (d->ops->to_irq)
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return d->ops->to_irq(d, hwirq);
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if (WARN_ON(hwirq < d->hwirq_base))
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return 0;
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return d->irq_base + hwirq - d->hwirq_base;
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}
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#define irq_domain_for_each_hwirq(d, hw) \
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for (hw = d->hwirq_base; hw < d->hwirq_base + d->nr_irq; hw++)
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#define irq_domain_for_each_irq(d, hw, irq) \
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for (hw = d->hwirq_base, irq = irq_domain_to_irq(d, hw); \
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hw < d->hwirq_base + d->nr_irq; \
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hw++, irq = irq_domain_to_irq(d, hw))
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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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extern struct irq_domain_ops irq_domain_simple_ops;
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#endif /* CONFIG_IRQ_DOMAIN */
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#if defined(CONFIG_IRQ_DOMAIN) && defined(CONFIG_OF_IRQ)
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extern void irq_domain_add_simple(struct device_node *controller, int irq_base);
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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_IRQ_DOMAIN && 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_IRQ_DOMAIN && CONFIG_OF_IRQ */
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#endif /* _LINUX_IRQDOMAIN_H */
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