mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
![Jamie Iles](/assets/img/avatar_default.png)
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>
107 lines
3.9 KiB
C
107 lines
3.9 KiB
C
/*
|
|
* 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>
|
|
#include <linux/mod_devicetable.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
|
|
* @hwirq_base: Starting number for hwirqs 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;
|
|
unsigned int hwirq_base;
|
|
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)
|
|
{
|
|
if (d->ops->to_irq)
|
|
return d->ops->to_irq(d, hwirq);
|
|
if (WARN_ON(hwirq < d->hwirq_base))
|
|
return 0;
|
|
return d->irq_base + hwirq - d->hwirq_base;
|
|
}
|
|
|
|
#define irq_domain_for_each_hwirq(d, hw) \
|
|
for (hw = d->hwirq_base; hw < d->hwirq_base + d->nr_irq; hw++)
|
|
|
|
#define irq_domain_for_each_irq(d, hw, irq) \
|
|
for (hw = d->hwirq_base, irq = irq_domain_to_irq(d, hw); \
|
|
hw < d->hwirq_base + d->nr_irq; \
|
|
hw++, irq = irq_domain_to_irq(d, hw))
|
|
|
|
extern void irq_domain_add(struct irq_domain *domain);
|
|
extern void irq_domain_del(struct irq_domain *domain);
|
|
|
|
extern struct irq_domain_ops irq_domain_simple_ops;
|
|
#endif /* CONFIG_IRQ_DOMAIN */
|
|
|
|
#if defined(CONFIG_IRQ_DOMAIN) && defined(CONFIG_OF_IRQ)
|
|
extern void irq_domain_add_simple(struct device_node *controller, int irq_base);
|
|
extern void irq_domain_generate_simple(const struct of_device_id *match,
|
|
u64 phys_base, unsigned int irq_start);
|
|
#else /* CONFIG_IRQ_DOMAIN && CONFIG_OF_IRQ */
|
|
static inline void irq_domain_generate_simple(const struct of_device_id *match,
|
|
u64 phys_base, unsigned int irq_start) { }
|
|
#endif /* CONFIG_IRQ_DOMAIN && CONFIG_OF_IRQ */
|
|
|
|
#endif /* _LINUX_IRQDOMAIN_H */
|