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Adaptation/GUID-DB55C1A0-2901-4661-B6B1-3B61BF6FF4FA.dita
author Graeme Price <GRAEME.PRICE@NOKIA.COM>
Fri, 15 Oct 2010 14:32:18 +0100
changeset 15 307f4279f433
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<?xml version="1.0" encoding="utf-8"?>
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
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<!-- This component and the accompanying materials are made available under the terms of the License
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"Eclipse Public License v1.0" which accompanies this distribution,
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
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<!-- Initial Contributors:
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    Nokia Corporation - initial contribution.
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Contributors:
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-->
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<!DOCTYPE concept
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  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
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<concept id="GUID-DB55C1A0-2901-4661-B6B1-3B61BF6FF4FA" xml:lang="en"><title>Register Access Client Interface Guide</title><shortdesc>Explains how to use the Register Access client interface
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functions. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
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<p>The Register Access client interface is intended for use in writing
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device drivers. Writing device drivers involves frequent access to
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hardware registers by reading, writing and modifying them. </p>
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<section id="GUID-7107B7C2-04E3-4876-892B-20C3F9F12F85"><title>Interface
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class</title>             <p>The client interface for the Register
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Access platform services is:</p><table id="GUID-A29A52B7-14C5-40F3-A73B-284B0D730965">
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<tgroup cols="2"><colspec colname="col1"/><colspec colname="col2"/>
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<thead>
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<row>
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<entry>Class</entry>
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<entry>Description</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry><xref href="GUID-66BB033A-3386-3913-9A25-EF3867D42C2C.dita"><apiname>AsspRegister</apiname></xref></entry>
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<entry>Provides read, write and modify functions to access hardware
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registers of different widths.</entry>
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</row>
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</tbody>
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</tgroup>
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</table>         </section>
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<section id="GUID-E1D195A0-715F-5961-A67C-A2536D68DAE3"><title>Interface
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functions</title> <p>The Register Access client interface provides
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the following functions:</p><table id="GUID-12019299-2FEB-4F6B-8217-D4AD085B12BB">
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<tgroup cols="3"><colspec colname="col1"/><colspec colname="col2"/>
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<colspec colname="col3"/>
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<thead>
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<row>
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<entry>Function</entry>
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<entry>Return Type</entry>
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<entry>Description</entry>
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</row>
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</thead>
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<tbody>
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<row>
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<entry><xref href="GUID-66BB033A-3386-3913-9A25-EF3867D42C2C.dita#GUID-66BB033A-3386-3913-9A25-EF3867D42C2C/GUID-A47E7A93-8180-38BA-8FAD-27ADA0E86EF7"><apiname>AsspRegister::Read8(TLinAddr aAddr)</apiname></xref></entry>
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<entry>TUint8</entry>
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<entry>Return the contents of an 8-bit register.</entry>
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</row>
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<row>
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<entry><xref href="GUID-66BB033A-3386-3913-9A25-EF3867D42C2C.dita#GUID-66BB033A-3386-3913-9A25-EF3867D42C2C/GUID-41AA4058-4528-3AB7-9084-AA6053AF0656"><apiname>AsspRegister::Read16(TLinAddr aAddr)</apiname></xref></entry>
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<entry>TUint16</entry>
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<entry>Return the contents of a 16-bit register.</entry>
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</row>
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<row>
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<entry><xref href="GUID-66BB033A-3386-3913-9A25-EF3867D42C2C.dita#GUID-66BB033A-3386-3913-9A25-EF3867D42C2C/GUID-E637527E-537A-367D-91C2-A3BB3AA0A587"><apiname>AsspRegister::Read32(TLinAddr aAddr)</apiname></xref></entry>
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<entry>TUint32</entry>
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<entry>Return the contents of a 32-bit register.</entry>
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</row>
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<row>
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<entry><xref href="GUID-66BB033A-3386-3913-9A25-EF3867D42C2C.dita#GUID-66BB033A-3386-3913-9A25-EF3867D42C2C/GUID-05FADA8D-5B77-39C6-A939-5EB1B209DD53"><apiname>AsspRegister::Read64(TLinAddr aAddr)</apiname></xref></entry>
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<entry>TUint64</entry>
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<entry>Return the contents of a 64-bit register.</entry>
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</row>
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<row>
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<entry><xref href="GUID-66BB033A-3386-3913-9A25-EF3867D42C2C.dita#GUID-66BB033A-3386-3913-9A25-EF3867D42C2C/GUID-CB85C4D4-3652-311E-808A-048A43F49F3E"><apiname>AsspRegister::Write8(TLinAddr aAddr, TUint8 aValue)</apiname></xref></entry>
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<entry>void</entry>
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<entry>Store a new value in an 8-bit register.</entry>
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</row>
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<row>
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<entry><xref href="GUID-66BB033A-3386-3913-9A25-EF3867D42C2C.dita#GUID-66BB033A-3386-3913-9A25-EF3867D42C2C/GUID-C20B9119-AAC8-354B-902A-B4349AEFC00E"><apiname>AsspRegister::Write16(TLinAddr aAddr, TUint16 aValue)</apiname></xref></entry>
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<entry>void</entry>
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<entry>Store a new value in a 16-bit register.</entry>
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</row>
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<row>
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<entry><xref href="GUID-66BB033A-3386-3913-9A25-EF3867D42C2C.dita#GUID-66BB033A-3386-3913-9A25-EF3867D42C2C/GUID-E18C1674-47EA-3B70-9BEE-55302D58F83B"><apiname>AsspRegister::Write32(TLinAddr aAddr, TUint32 aValue)</apiname></xref></entry>
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<entry>void</entry>
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<entry>Store a new value in a 32-bit register.</entry>
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</row>
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<row>
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<entry><xref href="GUID-66BB033A-3386-3913-9A25-EF3867D42C2C.dita#GUID-66BB033A-3386-3913-9A25-EF3867D42C2C/GUID-99D3233D-8F1C-3A65-BC1F-F10998728EB8"><apiname>AsspRegister::Write64(TLinAddr aAddr, TUint64 aValue)</apiname></xref></entry>
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<entry>void</entry>
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<entry>Store a new value in a 64-bit register.</entry>
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</row>
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<row>
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<entry><xref href="GUID-66BB033A-3386-3913-9A25-EF3867D42C2C.dita#GUID-66BB033A-3386-3913-9A25-EF3867D42C2C/GUID-3E66E373-E7DB-3F59-B6B1-3577AAD9FBF0"><apiname>AsspRegister::Modify8(TLinAddr aAddr, TUint8 aClearMask,
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TUint8 aSetMask)</apiname></xref></entry>
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<entry>void</entry>
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<entry>Modify the contents of an 8-bit register.</entry>
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</row>
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<row>
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<entry><xref href="GUID-66BB033A-3386-3913-9A25-EF3867D42C2C.dita#GUID-66BB033A-3386-3913-9A25-EF3867D42C2C/GUID-9A6FF0D8-1136-3188-8D85-43EF8919FA7C"><apiname>AsspRegister::Modify16(TLinAddr aAddr, TUint16 aClearMask,
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TUint16 aSetMask)</apiname></xref></entry>
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<entry>void</entry>
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<entry>Modify the contents of a 16-bit register.</entry>
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</row>
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<row>
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<entry><xref href="GUID-66BB033A-3386-3913-9A25-EF3867D42C2C.dita#GUID-66BB033A-3386-3913-9A25-EF3867D42C2C/GUID-035D2133-037A-36C5-B47C-A6FD00FEE3BA"><apiname>AsspRegister::Modify32(TLinAddr aAddr, TUint32 aClearMask,
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TUint32 aSetMask)</apiname></xref></entry>
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<entry>void</entry>
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<entry>Modify the contents of a 32-bit register.</entry>
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</row>
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<row>
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<entry><xref href="GUID-66BB033A-3386-3913-9A25-EF3867D42C2C.dita#GUID-66BB033A-3386-3913-9A25-EF3867D42C2C/GUID-7127519C-305D-3727-898F-860023CE586A"><apiname>AsspRegister::Modify64(TLinAddr aAddr, TUint64 aClearMask,
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TUint64 aSetMask)</apiname></xref></entry>
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<entry>void</entry>
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<entry>Modify the contents of a 64-bit register.</entry>
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</row>
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</tbody>
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</tgroup>
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</table> <p>All these functions can be called in any context. </p> <p>The address of a particular register on a particular platform
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is typically expressed as a base address and an offset: this is what
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you pass to the <codeph>aAddr</codeph> argument of these functions
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as a <codeph>TLinAddr</codeph>. </p> <p>The write functions take an
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unsigned integer (<codeph>TUint8</codeph>, <codeph>TUint16</codeph>, <codeph>TUint32</codeph> or <codeph>TUint64</codeph>) as the value
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of the parameter <codeph>aValue</codeph>.</p> <p>The modify functions
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take two unsigned integers (<codeph>TUint8</codeph>, <codeph>TUint16</codeph>, <codeph>TUint32</codeph> or <codeph>TUint64</codeph>) as arguments.
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Both the parameters, <codeph>aClearMask</codeph> and <codeph>aSetMask</codeph>, are bitmasks. The <codeph>aClearMask</codeph> argument clears the
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bits specified and the <codeph>aSetMask</codeph> sets the bits specified. </p> <b>Addressing a register</b><p>The following code reads the current
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value of a hardware register identified by a base address <codeph>iBaseAddr</codeph> plus an offset <codeph>KHoPciStatus</codeph>. </p><codeblock id="GUID-6308D594-B74D-50EE-A3EB-D8739371E46B" xml:space="preserve">TUint status=AsspRegister::Read16(iBaseAddr+KHoPciStatus);</codeblock><b>Modifying a register</b><p>The following code clears the bits
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specified by the bitmask <codeph>KHtPciStatus_ParityError</codeph> and sets the bits specified by the bitmask <codeph>NULL</codeph> (that is so say, none in this case). </p><codeblock id="GUID-F000597B-1B52-5C3F-B61E-6B5B88D859C7" xml:space="preserve">AsspRegister::Modify16(baseAddr+KHoPciStatus,KHtPciStatus_ParityError,NULL);</codeblock></section>
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</conbody><related-links>
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<link href="GUID-3722B946-07CF-4AEA-B228-E50642D6B5BE.dita"><linktext>Register
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Access Implementation Guide</linktext></link>
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</related-links></concept>
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