UM0851 datasheet(34/245 Pages) STMICROELECTRONICS

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Platform section

UM0851

34/245

Doc ID 16604 Rev 2

description structure in the descriptor structures array. The descriptor structure contains

status information and pointers to the interrupt flow method and the interrupt chip structure

which are assigned to this interrupt.

Whenever an interrupt triggers, the low level arch code calls into the generic interrupt code

by calling desc->handle_irq(). This high level IRQ handling function only uses desc->chip

primitives referenced by the assigned chip descriptor structure. The details of these

primitives are covered in later sections.

struct irq_desc {

irq_flow_handler_t

handle_irq;

struct irq_chip

*chip;

struct msi_desc

*msi_desc;

void

*handler_data;

void

*chip_data;

struct irqaction

*action;/* IRQ action list */

unsigned int

status;/* IRQ status */

unsigned int

depth;/* nested irq disables */

unsigned int

wake_depth;/* nested wake enables */

unsigned int

irq_count;/* For detecting broken

IRQs */

unsigned int

irqs_unhandled;

unsigned long

last_unhandled;/* Aging timer for unhandled count */

spinlock_t

lock;

#ifdef CONFIG_SMP

cpumask_t

affinity;

unsigned int

cpu;

#endif

#if defined(CONFIG_GENERIC_PENDING_IRQ) || defined(CONFIG_IRQBALANCE)

cpumask_t

pending_mask;

#endif

#ifdef CONFIG_PROC_FS

struct proc_dir_entry*dir;

#endif

const char

*name;

}

High level driver API

The high level driver API normally used in device drivers consists of the following functions:

●

request_irq()

●

free_irq()

●

disable_irq()

●

enable_irq()

●

disable_irq_nosync() (SMP only)

●

synchronize_irq() (SMP only)

●

set_irq_type()

●

set_irq_wake()

●

set_irq_data()

●

set_irq_chip()

●

set_irq_chip_data()

The details of some of the most important APIs described above are covered in

Section 3.2.5: VIC usage.

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