diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/irq.h | 6 | ||||
| -rw-r--r-- | include/linux/irqdomain.h | 81 | ||||
| -rw-r--r-- | include/linux/of_irq.h | 4 |
3 files changed, 91 insertions, 0 deletions
diff --git a/include/linux/irq.h b/include/linux/irq.h index 5f695041090..87a06f345bd 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -108,14 +108,18 @@ enum { }; struct msi_desc; +struct irq_domain; /** * struct irq_data - per irq and irq chip data passed down to chip functions * @irq: interrupt number + * @hwirq: hardware interrupt number, local to the interrupt domain * @node: node index useful for balancing * @state_use_accessors: status information for irq chip functions. * Use accessor functions to deal with it * @chip: low level interrupt hardware access + * @domain: Interrupt translation domain; responsible for mapping + * between hwirq number and linux irq number. * @handler_data: per-IRQ data for the irq_chip methods * @chip_data: platform-specific per-chip private data for the chip * methods, to allow shared chip implementations @@ -128,9 +132,11 @@ struct msi_desc; */ struct irq_data { unsigned int irq; + unsigned long hwirq; unsigned int node; unsigned int state_use_accessors; struct irq_chip *chip; + struct irq_domain *domain; void *handler_data; void *chip_data; struct msi_desc *msi_desc; diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h new file mode 100644 index 00000000000..8f2c10a784a --- /dev/null +++ b/include/linux/irqdomain.h @@ -0,0 +1,81 @@ +/* + * 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. + * + * irq_domain is expected to be embedded in an interrupt controller's private + * data structure. + */ +#ifndef _LINUX_IRQDOMAIN_H +#define _LINUX_IRQDOMAIN_H + +#include <linux/irq.h> + +#ifdef CONFIG_IRQ_DOMAIN +struct device_node; +struct irq_domain; + +/** + * struct irq_domain_ops - Methods for irq_domain objects + * @to_irq: (optional) given a local hardware irq number, return the linux + * irq number. If to_irq is not implemented, then the irq_domain + * will use this translation: irq = (domain->irq_base + hwirq) + * @dt_translate: Given a device tree node and interrupt specifier, decode + * the hardware irq number and linux irq type value. + */ +struct irq_domain_ops { + unsigned int (*to_irq)(struct irq_domain *d, unsigned long hwirq); + +#ifdef CONFIG_OF + int (*dt_translate)(struct irq_domain *d, struct device_node *node, + const u32 *intspec, unsigned int intsize, + unsigned long *out_hwirq, unsigned int *out_type); +#endif /* CONFIG_OF */ +}; + +/** + * struct irq_domain - Hardware interrupt number translation object + * @list: Element in global irq_domain list. + * @irq_base: Start of irq_desc range assigned to the irq_domain. The creator + * of the irq_domain is responsible for allocating the array of + * irq_desc structures. + * @nr_irq: Number of irqs managed by the irq domain + * @ops: pointer to irq_domain methods + * @priv: private data pointer for use by owner. Not touched by irq_domain + * core code. + * @of_node: (optional) Pointer to device tree nodes associated with the + * irq_domain. Used when decoding device tree interrupt specifiers. + */ +struct irq_domain { + struct list_head list; + unsigned int irq_base; + unsigned int nr_irq; + const struct irq_domain_ops *ops; + void *priv; + struct device_node *of_node; +}; + +/** + * irq_domain_to_irq() - Translate from a hardware irq to a linux irq number + * + * Returns the linux irq number associated with a hardware irq. By default, + * the mapping is irq == domain->irq_base + hwirq, but this mapping can + * be overridden if the irq_domain implements a .to_irq() hook. + */ +static inline unsigned int irq_domain_to_irq(struct irq_domain *d, + unsigned long hwirq) +{ + return d->ops->to_irq ? d->ops->to_irq(d, hwirq) : d->irq_base + hwirq; +} + +extern void irq_domain_add(struct irq_domain *domain); +extern void irq_domain_del(struct irq_domain *domain); +#endif /* CONFIG_IRQ_DOMAIN */ + +#endif /* _LINUX_IRQDOMAIN_H */ diff --git a/include/linux/of_irq.h b/include/linux/of_irq.h index e6955f5d1f0..cd2e61ce4e8 100644 --- a/include/linux/of_irq.h +++ b/include/linux/of_irq.h @@ -63,6 +63,9 @@ extern int of_irq_map_one(struct device_node *device, int index, extern unsigned int irq_create_of_mapping(struct device_node *controller, const u32 *intspec, unsigned int intsize); +#ifdef CONFIG_IRQ_DOMAIN +extern void irq_dispose_mapping(unsigned int irq); +#endif extern int of_irq_to_resource(struct device_node *dev, int index, struct resource *r); extern int of_irq_count(struct device_node *dev); @@ -70,6 +73,7 @@ extern int of_irq_to_resource_table(struct device_node *dev, struct resource *res, int nr_irqs); extern struct device_node *of_irq_find_parent(struct device_node *child); + #endif /* CONFIG_OF_IRQ */ #endif /* CONFIG_OF */ #endif /* __OF_IRQ_H */ |