From: Peter Ryser <peter.ryser@xilinx.com>
To: Grant Likely <glikely@gmail.com>
Cc: linuxppc-embedded@ozlabs.org
Subject: Re: Address mapping PPC 405
Date: Fri, 26 Aug 2005 15:47:07 -0700 [thread overview]
Message-ID: <430F9BEB.70805@xilinx.com> (raw)
In-Reply-To: <20050826031057.GA6553@siegfried.thelikelysolution.ca>
>Since there is no seperate IO memory space you can access the registers
>with simple pointers.
>
>Whether or not it is a good idea (based on coding conventions) I'll
>leave for someone else to answer. :)
>
You want to use the read{b,w,l} and write{b,w,l} macros for two reasons:
1. Accesses to registers need to be synch'ed with 'eieio' or some other
synchronizing instructions.
2. Portability of your driver if you ever should ever move it to a
different architecture and/or change the endianness in your system
- Peter
next prev parent reply other threads:[~2005-08-26 22:48 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-26 1:31 Address mapping PPC 405 P. Sadik
2005-08-26 3:10 ` Grant Likely
2005-08-26 22:47 ` Peter Ryser [this message]
2005-08-28 15:15 ` Jon Masters
2005-08-29 0:26 ` Grant Likely
2005-08-29 1:11 ` Jon Masters
2005-08-30 15:38 ` Matt Porter
2005-09-15 16:03 ` PPC4xx cleanup Stefan Roese
2005-09-15 16:25 ` Matt Porter
2005-09-15 19:03 ` Dan Malek
2005-09-19 14:08 ` Matt Porter
2005-09-16 11:06 ` [PATCH] ppc32: cleanup AMCC PPC4xx eval boards to better support U-Boot Stefan Roese
2005-09-16 16:27 ` Eugene Surovegin
2005-09-19 11:02 ` Stefan Roese
2005-09-19 13:59 ` Matt Porter
2005-09-19 15:06 ` Stefan Roese
2005-09-19 15:21 ` Matt Porter
2005-09-19 17:14 ` Eugene Surovegin
2005-11-22 17:34 ` [PATCH] ppc32: Add P3P440 (440GP) board support Stefan Roese
2005-09-19 11:20 ` [PATCH] ppc32: cleanup AMCC PPC44x eval boards to better support U-Boot Stefan Roese
2005-09-30 12:52 ` [PATCH] ppc32: cleanup AMCC PPC40x eval boards to " Stefan Roese
2005-10-28 15:58 ` [PATCH] ppc32: Remove internal PCI arbiter check on PPC40x Stefan Roese
2005-10-31 9:29 ` [PATCH] ppc32: Add missing initrd header on ppc440 Stefan Roese
2005-10-31 14:41 ` Matt Porter
2005-08-30 15:09 ` Address mapping PPC 405 Matt Porter
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