ARM-Linux下设计I/O驱动程序的关键点分析

The Analyse of the Key of Designing the I/O Driver on ARM-Linux

I/O是CPU与外设之间交互的主要通道,典型驱动程序的最主要的任务就是读写I/O端口和I/O内存(通称为I/O区域)。本文将阐述在ARM-Linux系统中编写驱动程序来使用I/O区域的关键两点——地址映射和I/O端口的注册。并介绍内核提供的读写I/O端口的各种函数。

I/O is the main interaction passage between the CPU and outside equipment. The most important task of the representative driver is to reading and writing the I/O port and the I/O memory （generally called I/O area）. The paper expatiated the two important key that how to program the driver to use the I/O area, the mapped address and the registered I/O port. The paper also introduced diversified function of reading and writing I/O port which provided by the kernel.