UM0851 datasheet(33/245 Pages) STMICROELECTRONICS

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UM0851

Platform section

Doc ID 16604 Rev 2

33/245

Figure 4.

VIC block diagram

3.2.2

Software overview

Linux provides the generic interrupt handling layer which contributes to the complete

abstraction of interrupt handling for device drivers. It is able to handle all the different types

of interrupt controller hardware. Device drivers use generic API functions to request, enable,

disable and free interrupts. The drivers do not have to know anything about interrupt

hardware details, so they can be used on different platforms without code changes.

At Linux level there are three main levels of abstraction in the interrupt code:

●

High level driver API

●

High level IRQ flow handlers

●

Chip level hardware encapsulation

Interrupt control flow

Each interrupt is described by an interrupt descriptor struct irq_desc. The interrupt is

referenced by an 'unsigned int' numeric value which selects the corresponding interrupt

nVICIRQ

nVICFIQ

FIQSTATUS[31:0]

IRQSTATUS[31:0]

VICINTSOURCE[31:0]

VICVECTADDRIN

VICVECTADDROUT

nVICIRQIN

nVICFIQIN

HCLK

HSELVIC

HRESETn

HWRITE

HREADYIN

HREADYOUT

HRESP[1:0}

Control logic

AHB slave interface

Vectored interrupt 0

Vectored interrupt 1

Vectored interrupt 15

Interrupt

request

logic

Non-vectored FIQ

interrupt logic

Non-vectored IRQ

interrupt logic

IRQ vector

address and

priority logic

HTRANS

HWDATA[31:0]

HADDR[11:2]

HRDATA[31:0]

HSIZE[2:0]

HPROT

IRQ

VectAddrin

VectAddrOut

VectAddr15

VectAddrn

VectAddr1

VectAddr0

IRQ0

IRQ1

IRQn

IRQ15

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