From mboxrd@z Thu Jan  1 00:00:00 1970
From: Tony Lindgren <tony@atomide.com>
Subject: Re: omap 5912 serial driver
Date: Fri, 13 Jan 2006 16:43:42 -0800
Message-ID: <20060114004342.GK5499@atomide.com>
References: <9cba36250601130644t2554c420x78373804a51a2949@mail.gmail.com>
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To: vikas gupta <vikas.iet@gmail.com>
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* vikas gupta <vikas.iet@gmail.com> [060113 06:50]:
> hi all
> 
> 
> 
> i am a naive user trying his hands on arm osk omap5912 board
> 
> 
> 
> Well i wanted to know whether it is possible to test serial port on omap
> board by using inb/outb instruction as can be done in x86 platform...
> 
> If it is possible then can u please suggest me a working example of one test
> case doing this thing..
> 
> I have tried my hands in it but wothout success on x86 platform below
> mention program is working fine but on arm board it's not working so can
> anyone help me ???
> 
> 
> 
> Sorry, if the question seems naive as this is my initial attempt :)
> 
> 
> 
> test program
> 
> =============
> 
> 
> 
> include <stdio.h>
> 
> #include <stdlib.h>
> 
> #include <unistd.h>
> 
> #include <sys/io.h>
> 
> 
> 
> #define base 0x378
> 
> #define value 255
> 
> 
> 
> main(int argc, char **argv)
> 
> {
> 
>   int value1;
> 
>   if (ioperm(base,1,1))
> 
>     fprintf(stderr, "Couldn't get the port at %x\n", base), exit(1);
> 
> 
> 
>    outb(value, base);
> 
>    value1 = inb(base);
> 
>   printf("value written is %d \n",value1);
> 
> }

It won't quite work as the IO address is different. Also inb/outb are
mapped to __raw_readb/__raw_writeb.

See these files:

include/asm-arm/io.h
include/asm-arm/arch-omap/io.h

Tony