329 lines
12 KiB
C
329 lines
12 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.
|
|
*
|
|
* Interrupt controller "domain" data structure. This could be defined as a
|
|
* irq domain controller. That is, it handles the mapping between hardware
|
|
* and virtual interrupt numbers for a given interrupt domain. The domain
|
|
* structure is generally created by the PIC code for a given PIC instance
|
|
* (though a domain can cover more than one PIC if they have a flat number
|
|
* model). It's the domain callbacks that are responsible for setting the
|
|
* irq_chip on a given irq_desc after it's been mapped.
|
|
*
|
|
* The host code and data structures are agnostic to whether or not
|
|
* we use an open firmware device-tree. We do have references to struct
|
|
* device_node in two places: in irq_find_host() to find the host matching
|
|
* a given interrupt controller node, and of course as an argument to its
|
|
* counterpart domain->ops->match() callback. However, those are treated as
|
|
* generic pointers by the core and the fact that it's actually a device-node
|
|
* pointer is purely a convention between callers and implementation. This
|
|
* code could thus be used on other architectures by replacing those two
|
|
* by some sort of arch-specific void * "token" used to identify interrupt
|
|
* controllers.
|
|
*/
|
|
|
|
#ifndef _LINUX_IRQDOMAIN_H
|
|
#define _LINUX_IRQDOMAIN_H
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/irqhandler.h>
|
|
#include <linux/radix-tree.h>
|
|
|
|
struct device_node;
|
|
struct irq_domain;
|
|
struct of_device_id;
|
|
struct irq_chip;
|
|
struct irq_data;
|
|
|
|
/* Number of irqs reserved for a legacy isa controller */
|
|
#define NUM_ISA_INTERRUPTS 16
|
|
|
|
/**
|
|
* struct irq_domain_ops - Methods for irq_domain objects
|
|
* @match: Match an interrupt controller device node to a host, returns
|
|
* 1 on a match
|
|
* @map: Create or update a mapping between a virtual irq number and a hw
|
|
* irq number. This is called only once for a given mapping.
|
|
* @unmap: Dispose of such a mapping
|
|
* @xlate: Given a device tree node and interrupt specifier, decode
|
|
* the hardware irq number and linux irq type value.
|
|
*
|
|
* Functions below are provided by the driver and called whenever a new mapping
|
|
* is created or an old mapping is disposed. The driver can then proceed to
|
|
* whatever internal data structures management is required. It also needs
|
|
* to setup the irq_desc when returning from map().
|
|
*/
|
|
struct irq_domain_ops {
|
|
int (*match)(struct irq_domain *d, struct device_node *node);
|
|
int (*map)(struct irq_domain *d, unsigned int virq, irq_hw_number_t hw);
|
|
void (*unmap)(struct irq_domain *d, unsigned int virq);
|
|
int (*xlate)(struct irq_domain *d, struct device_node *node,
|
|
const u32 *intspec, unsigned int intsize,
|
|
unsigned long *out_hwirq, unsigned int *out_type);
|
|
|
|
#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
|
|
/* extended V2 interfaces to support hierarchy irq_domains */
|
|
int (*alloc)(struct irq_domain *d, unsigned int virq,
|
|
unsigned int nr_irqs, void *arg);
|
|
void (*free)(struct irq_domain *d, unsigned int virq,
|
|
unsigned int nr_irqs);
|
|
void (*activate)(struct irq_domain *d, struct irq_data *irq_data);
|
|
void (*deactivate)(struct irq_domain *d, struct irq_data *irq_data);
|
|
#endif
|
|
};
|
|
|
|
extern struct irq_domain_ops irq_generic_chip_ops;
|
|
|
|
struct irq_domain_chip_generic;
|
|
|
|
/**
|
|
* struct irq_domain - Hardware interrupt number translation object
|
|
* @link: Element in global irq_domain list.
|
|
* @name: Name of interrupt domain
|
|
* @ops: pointer to irq_domain methods
|
|
* @host_data: private data pointer for use by owner. Not touched by irq_domain
|
|
* core code.
|
|
* @flags: host per irq_domain flags
|
|
*
|
|
* Optional elements
|
|
* @of_node: Pointer to device tree nodes associated with the irq_domain. Used
|
|
* when decoding device tree interrupt specifiers.
|
|
* @gc: Pointer to a list of generic chips. There is a helper function for
|
|
* setting up one or more generic chips for interrupt controllers
|
|
* drivers using the generic chip library which uses this pointer.
|
|
* @parent: Pointer to parent irq_domain to support hierarchy irq_domains
|
|
*
|
|
* Revmap data, used internally by irq_domain
|
|
* @revmap_direct_max_irq: The largest hwirq that can be set for controllers that
|
|
* support direct mapping
|
|
* @revmap_size: Size of the linear map table @linear_revmap[]
|
|
* @revmap_tree: Radix map tree for hwirqs that don't fit in the linear map
|
|
* @linear_revmap: Linear table of hwirq->virq reverse mappings
|
|
*/
|
|
struct irq_domain {
|
|
struct list_head link;
|
|
const char *name;
|
|
const struct irq_domain_ops *ops;
|
|
void *host_data;
|
|
unsigned int flags;
|
|
|
|
/* Optional data */
|
|
struct device_node *of_node;
|
|
struct irq_domain_chip_generic *gc;
|
|
#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
|
|
struct irq_domain *parent;
|
|
#endif
|
|
|
|
/* reverse map data. The linear map gets appended to the irq_domain */
|
|
irq_hw_number_t hwirq_max;
|
|
unsigned int revmap_direct_max_irq;
|
|
unsigned int revmap_size;
|
|
struct radix_tree_root revmap_tree;
|
|
unsigned int linear_revmap[];
|
|
};
|
|
|
|
/* Irq domain flags */
|
|
enum {
|
|
/* Irq domain is hierarchical */
|
|
IRQ_DOMAIN_FLAG_HIERARCHY = (1 << 0),
|
|
|
|
/* Core calls alloc/free recursive through the domain hierarchy. */
|
|
IRQ_DOMAIN_FLAG_AUTO_RECURSIVE = (1 << 1),
|
|
|
|
/*
|
|
* Flags starting from IRQ_DOMAIN_FLAG_NONCORE are reserved
|
|
* for implementation specific purposes and ignored by the
|
|
* core code.
|
|
*/
|
|
IRQ_DOMAIN_FLAG_NONCORE = (1 << 16),
|
|
};
|
|
|
|
#ifdef CONFIG_IRQ_DOMAIN
|
|
struct irq_domain *__irq_domain_add(struct device_node *of_node, int size,
|
|
irq_hw_number_t hwirq_max, int direct_max,
|
|
const struct irq_domain_ops *ops,
|
|
void *host_data);
|
|
struct irq_domain *irq_domain_add_simple(struct device_node *of_node,
|
|
unsigned int size,
|
|
unsigned int first_irq,
|
|
const struct irq_domain_ops *ops,
|
|
void *host_data);
|
|
struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
|
|
unsigned int size,
|
|
unsigned int first_irq,
|
|
irq_hw_number_t first_hwirq,
|
|
const struct irq_domain_ops *ops,
|
|
void *host_data);
|
|
extern struct irq_domain *irq_find_host(struct device_node *node);
|
|
extern void irq_set_default_host(struct irq_domain *host);
|
|
|
|
/**
|
|
* irq_domain_add_linear() - Allocate and register a linear revmap irq_domain.
|
|
* @of_node: pointer to interrupt controller's device tree node.
|
|
* @size: Number of interrupts in the domain.
|
|
* @ops: map/unmap domain callbacks
|
|
* @host_data: Controller private data pointer
|
|
*/
|
|
static inline struct irq_domain *irq_domain_add_linear(struct device_node *of_node,
|
|
unsigned int size,
|
|
const struct irq_domain_ops *ops,
|
|
void *host_data)
|
|
{
|
|
return __irq_domain_add(of_node, size, size, 0, ops, host_data);
|
|
}
|
|
static inline struct irq_domain *irq_domain_add_nomap(struct device_node *of_node,
|
|
unsigned int max_irq,
|
|
const struct irq_domain_ops *ops,
|
|
void *host_data)
|
|
{
|
|
return __irq_domain_add(of_node, 0, max_irq, max_irq, ops, host_data);
|
|
}
|
|
static inline struct irq_domain *irq_domain_add_legacy_isa(
|
|
struct device_node *of_node,
|
|
const struct irq_domain_ops *ops,
|
|
void *host_data)
|
|
{
|
|
return irq_domain_add_legacy(of_node, NUM_ISA_INTERRUPTS, 0, 0, ops,
|
|
host_data);
|
|
}
|
|
static inline struct irq_domain *irq_domain_add_tree(struct device_node *of_node,
|
|
const struct irq_domain_ops *ops,
|
|
void *host_data)
|
|
{
|
|
return __irq_domain_add(of_node, 0, ~0, 0, ops, host_data);
|
|
}
|
|
|
|
extern void irq_domain_remove(struct irq_domain *host);
|
|
|
|
extern int irq_domain_associate(struct irq_domain *domain, unsigned int irq,
|
|
irq_hw_number_t hwirq);
|
|
extern void irq_domain_associate_many(struct irq_domain *domain,
|
|
unsigned int irq_base,
|
|
irq_hw_number_t hwirq_base, int count);
|
|
extern void irq_domain_disassociate(struct irq_domain *domain,
|
|
unsigned int irq);
|
|
|
|
extern unsigned int irq_create_mapping(struct irq_domain *host,
|
|
irq_hw_number_t hwirq);
|
|
extern void irq_dispose_mapping(unsigned int virq);
|
|
|
|
/**
|
|
* irq_linear_revmap() - Find a linux irq from a hw irq number.
|
|
* @domain: domain owning this hardware interrupt
|
|
* @hwirq: hardware irq number in that domain space
|
|
*
|
|
* This is a fast path alternative to irq_find_mapping() that can be
|
|
* called directly by irq controller code to save a handful of
|
|
* instructions. It is always safe to call, but won't find irqs mapped
|
|
* using the radix tree.
|
|
*/
|
|
static inline unsigned int irq_linear_revmap(struct irq_domain *domain,
|
|
irq_hw_number_t hwirq)
|
|
{
|
|
return hwirq < domain->revmap_size ? domain->linear_revmap[hwirq] : 0;
|
|
}
|
|
extern unsigned int irq_find_mapping(struct irq_domain *host,
|
|
irq_hw_number_t hwirq);
|
|
extern unsigned int irq_create_direct_mapping(struct irq_domain *host);
|
|
extern int irq_create_strict_mappings(struct irq_domain *domain,
|
|
unsigned int irq_base,
|
|
irq_hw_number_t hwirq_base, int count);
|
|
|
|
static inline int irq_create_identity_mapping(struct irq_domain *host,
|
|
irq_hw_number_t hwirq)
|
|
{
|
|
return irq_create_strict_mappings(host, hwirq, hwirq, 1);
|
|
}
|
|
|
|
extern const struct irq_domain_ops irq_domain_simple_ops;
|
|
|
|
/* stock xlate functions */
|
|
int irq_domain_xlate_onecell(struct irq_domain *d, struct device_node *ctrlr,
|
|
const u32 *intspec, unsigned int intsize,
|
|
irq_hw_number_t *out_hwirq, unsigned int *out_type);
|
|
int irq_domain_xlate_twocell(struct irq_domain *d, struct device_node *ctrlr,
|
|
const u32 *intspec, unsigned int intsize,
|
|
irq_hw_number_t *out_hwirq, unsigned int *out_type);
|
|
int irq_domain_xlate_onetwocell(struct irq_domain *d, struct device_node *ctrlr,
|
|
const u32 *intspec, unsigned int intsize,
|
|
irq_hw_number_t *out_hwirq, unsigned int *out_type);
|
|
|
|
/* V2 interfaces to support hierarchy IRQ domains. */
|
|
extern struct irq_data *irq_domain_get_irq_data(struct irq_domain *domain,
|
|
unsigned int virq);
|
|
extern void irq_domain_set_info(struct irq_domain *domain, unsigned int virq,
|
|
irq_hw_number_t hwirq, struct irq_chip *chip,
|
|
void *chip_data, irq_flow_handler_t handler,
|
|
void *handler_data, const char *handler_name);
|
|
#ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
|
|
extern struct irq_domain *irq_domain_add_hierarchy(struct irq_domain *parent,
|
|
unsigned int flags, unsigned int size,
|
|
struct device_node *node,
|
|
const struct irq_domain_ops *ops, void *host_data);
|
|
extern int __irq_domain_alloc_irqs(struct irq_domain *domain, int irq_base,
|
|
unsigned int nr_irqs, int node, void *arg,
|
|
bool realloc);
|
|
extern void irq_domain_free_irqs(unsigned int virq, unsigned int nr_irqs);
|
|
extern void irq_domain_activate_irq(struct irq_data *irq_data);
|
|
extern void irq_domain_deactivate_irq(struct irq_data *irq_data);
|
|
|
|
static inline int irq_domain_alloc_irqs(struct irq_domain *domain,
|
|
unsigned int nr_irqs, int node, void *arg)
|
|
{
|
|
return __irq_domain_alloc_irqs(domain, -1, nr_irqs, node, arg, false);
|
|
}
|
|
|
|
extern int irq_domain_set_hwirq_and_chip(struct irq_domain *domain,
|
|
unsigned int virq,
|
|
irq_hw_number_t hwirq,
|
|
struct irq_chip *chip,
|
|
void *chip_data);
|
|
extern void irq_domain_reset_irq_data(struct irq_data *irq_data);
|
|
extern void irq_domain_free_irqs_common(struct irq_domain *domain,
|
|
unsigned int virq,
|
|
unsigned int nr_irqs);
|
|
extern void irq_domain_free_irqs_top(struct irq_domain *domain,
|
|
unsigned int virq, unsigned int nr_irqs);
|
|
|
|
extern int irq_domain_alloc_irqs_parent(struct irq_domain *domain,
|
|
unsigned int irq_base,
|
|
unsigned int nr_irqs, void *arg);
|
|
|
|
extern void irq_domain_free_irqs_parent(struct irq_domain *domain,
|
|
unsigned int irq_base,
|
|
unsigned int nr_irqs);
|
|
|
|
static inline bool irq_domain_is_hierarchy(struct irq_domain *domain)
|
|
{
|
|
return domain->flags & IRQ_DOMAIN_FLAG_HIERARCHY;
|
|
}
|
|
#else /* CONFIG_IRQ_DOMAIN_HIERARCHY */
|
|
static inline void irq_domain_activate_irq(struct irq_data *data) { }
|
|
static inline void irq_domain_deactivate_irq(struct irq_data *data) { }
|
|
static inline int irq_domain_alloc_irqs(struct irq_domain *domain,
|
|
unsigned int nr_irqs, int node, void *arg)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
static inline bool irq_domain_is_hierarchy(struct irq_domain *domain)
|
|
{
|
|
return false;
|
|
}
|
|
#endif /* CONFIG_IRQ_DOMAIN_HIERARCHY */
|
|
|
|
#else /* CONFIG_IRQ_DOMAIN */
|
|
static inline void irq_dispose_mapping(unsigned int virq) { }
|
|
static inline void irq_domain_activate_irq(struct irq_data *data) { }
|
|
static inline void irq_domain_deactivate_irq(struct irq_data *data) { }
|
|
#endif /* !CONFIG_IRQ_DOMAIN */
|
|
|
|
#endif /* _LINUX_IRQDOMAIN_H */
|