3.2.3 Interrupt Features
The interrupt implementation supports the following features:
• Interrupt Controller interrupt disable and enable
• Functions required by the Linux interrupt architecture as defined in the standard
ARM interrupt source code (mainly the <ltib_dir>/rpm/BUILD/linux/arch/arm/
kernel/irq.c file)
3.2.4 Interrupt Source Code Structure
The interrupt module is implemented in the following file (located in the directory
<ltib_dir>/rpm/BUILD/linux/arch/arm/plat-mxc):
irq.c (If CONFIG_MXC_TZIC is not selected)
tzic.c (If CONFIG_MXC_TZIC is selected)
gic.c (If CONFIG_ARM_GIC is selected)
There are also two header files (located in the include directory specified at the beginning
of this chapter):
hardware.h
irqs.h
The following table lists the source files for interrupts.
Table 3-1. Interrupt Files
File
Description
hardware.h
Register descriptions
irqs.h
Declarations for number of interrupts supported
gic.c
Actual interrupt functions for GIC modules
3.2.5 Interrupt Programming Interface
The machine-specific interrupt implementation exports a single function.
This function initializes the Interrupt Controller hardware and registers functions for
interrupt enable and disable from each interrupt source.
This is done with the global structure irq_desc of type struct irqdesc. After the
initialization, the interrupt can be used by the drivers through the request_irq() function to
register device-specific interrupt handlers.
Chapter 3 Machine Specific Layer (MSL)
i.MX 6SoloLite Linux Reference Manual, Rev. L3.0.35_4.1.0, 09/2013
Freescale Semiconductor, Inc.
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