UM0851 datasheet(25/245 Pages) STMICROELECTRONICS

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UM0851

Platform section

Doc ID 16604 Rev 2

25/245

Platform section

This section describes the basic SPEAr platform code and driver. It consists of the following

directories:

●

arch/arm/plat-spear

●

arch/arm/mach-spear600

●

arch/arm/mach-spear300

The platform code has been split in this way so that common code across SPEAr platforms

is kept in the plat-spear/ directory and platform specific code is kept in the respective mach-

spear600/ (or mach-spear300/ directory for all SPEAr3xx).

The platform code is responsible for:

●

Initializing VIC

●

Initializing the timer (clock source and clock event)

●

Initializing static memory mapping if required by the system

●

Defining IO_ADDRESS and related macros so that the static memory can be used

●

Providing platform specific code for power management, clock framework etc. and

initialization code for some specific controllers like fsmc and gpio

●

Providing system specific header files like those describing irq lines and base

addresses of respective devices

Additionally, there are 3 variants for SPEAr300 platform.

●

SPEAr300: Basic SPEAr300 with IPs for telecom applications

●

SPEAr310: Basic SPEAr300 with IPs for communication applications

●

SPEAr320: Basic SPEAr300 with IPs for industrial applications

Different architecture specific code for all the above variants (SPEAr3xx) are kept in mach-

spear300/ as all of these are basically SPEAr300 machines. Architecture specific code for

SPEAr600 is kept in mach-spear600/ and has no variant. They are distinguished with the

help of the following macros:

●

MACH_SPEAR600 or ARCH_SPEAR600 for SPEAr600

●

MACH_SPEAR300 or ARCH_SPEAR300 for all SPEAr300 platforms including variants

–

BOARD_SPEAR300 specific for telecom version of SPEAr300

–

BOARD_SPEAR310 specific for communication version of SPEAr300

–

BOARD_SPEAR320 specific for industrial version of SPEAr300

3.1

General purpose timer (GPT) driver

This section describes the driver of the general purpose timer embedded in SPEAr devices.

A digital general purpose timer is a programmable device with a counter that increments or

decrements at a fixed frequency and generates interrupts after a specified time. An

embedded system makes wide use of timers for different purpose, like for generating the

system-tick, which is the basic temporization mechanism of any RTOS, or for other fine

granularity time measurement mechanisms.

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