From: Alessandro Rubini <rubini@gnudd.com>
To: linuxppc-embedded@ozlabs.org
Subject: Re: ioremap and outb
Date: Fri, 4 Jan 2008 11:20:37 +0100 [thread overview]
Message-ID: <20080104102037.GA31627@mail.gnudd.com> (raw)
In-Reply-To: <14612559.post@talk.nabble.com>
Please don't change subject matter without changing subject line, and please
open a new thread when asking a new question.
> I am writing a driver in which device port is mapped to CPLD and 8 bit data
> bus is directly connected from processor to CPLD. Read write on CPLD memory
> mapped (buffer/register) is required to control the device. This is now IO
> mapped to processor.
This is typical. You'll find quite a lot of examples.
> addr=ioremap(base_addr,size); // Remap to Mem mapped
Yes.
> out_8(addr) and in_8(addr);
It should be right, although __raw_readb() and __raw_writeb() may
suffice for you. Please check the comments in <asm/io.h>.
It may also happen that you need to read/write 32 bits instead of 8,
but this depends on your specific hardware.
/alessandro
next prev parent reply other threads:[~2008-01-04 10:20 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-03 16:57 Drivers' probe function calling order DI BACCO ANTONIO - technolabs
2008-01-03 18:04 ` Jeff Mock
2008-01-03 21:54 ` Alessandro Rubini
2008-01-04 8:41 ` Misbah khan
2008-01-04 10:20 ` Alessandro Rubini [this message]
2008-01-04 10:45 ` ioremap and outb Arnd Bergmann
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