Linux Device Drivers - Communicating with Hardware

Name: Linux Device Drivers - Communicating with Hardware
Rating: 4.2 (158 reviews)

Linux Kernel Programming for IO Mapped and Memory Mapped devices

Last updated 11/2020

English

What you'll learn

9 sections • 84 lectures • 3h 11m total length

Introduction to RTC1:09
Explore how an RTC keeps date and time across power loss with a battery, offers alarm functionality, and uses nonvolatile memory to trigger events.
RTC Ports and Registers Part12:23
RTC Ports and Registers Part21:33
Linux Kernel Module communicating with RTC1:41
Walkthrough of rtc driver in Linux kernel2:19
Hardware and software clock3:07
Linux Kernel Module example to update time0:55

Introduction1:11
PCI Address Space1:22
PCI Configuration Space1:50
How to access registers in PCI Configuration Space2:48
lspci4:58
Access configuration address space from Linux Kernel Module3:08
Learn how a Linux kernel module accesses the configuration space by specifying bus, device, function, and offset, performing configuration transactions to read and write data.
Linux Kernel Module to print full address space2:19
What happens when we try to read a device which doesnt exist1:26
Base Address Registers5:34
Base Address of Base Address Register1:40
Find out amount of memory consumed by PCI Device2:50
Introduction to PCI Express1:27

What you will learn in this course:

Two modes of communication with hardware - IO Mapped IO and Memory Mapped IO
Kernel Drivers/Modules for IO Mapped IO - Speaker, RTC, Keyboard
Kernel Drivers/Modules for Memory Mapped IO - Hardware Random Generator, GPIO, UART
Accessing IO Mapped IO and Memory Mapped IO from user space
PCI and SMBIOS

API's/Macros/Structures

inb, outb, inw, outw, inl, outl
inb_p, outb_p, inw_p, outw_p, inl_p, outl_p
struct resource, request_region, release_region
ioperm, iopl, geteuid
request_mem_region, release_mem_region, ioremap, iounmap, ioread8, ioread16, ioread32, iowrite8, iowrite16, iowrite32
ioport_map, ioport_unmap,mmap

Files:

/dev/port, /dev/mem, /proc/iomem, /proc/ioports

Commands