struct irq_chip_generic — Generic irq chip data structure
struct irq_chip_generic {
raw_spinlock_t lock;
void __iomem * reg_base;
unsigned int irq_base;
unsigned int irq_cnt;
u32 mask_cache;
u32 type_cache;
u32 polarity_cache;
u32 wake_enabled;
u32 wake_active;
unsigned int num_ct;
void * private;
struct list_head list;
struct irq_chip_type chip_types[0];
}; Lock to protect register and cache data access
Register base address (virtual)
Interrupt base nr for this chip
Number of interrupts handled by this chip
Cached mask register
Cached type register
Cached polarity register
Interrupt can wakeup from suspend
Interrupt is marked as an wakeup from suspend source
Number of available irq_chip_type instances (usually 1)
Private data for non generic chip callbacks
List head for keeping track of instances
Array of interrupt irq_chip_types
Note, that irq_chip_generic can have multiple irq_chip_type implementations which can be associated to a particular irq line of an irq_chip_generic instance. That allows to share and protect state in an irq_chip_generic instance when we need to implement different flow mechanisms (level/edge) for it.