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Adaptation/GUID-9BBDFF77-5E2C-4E13-BEB3-716CC80B3375.dita
author Graeme Price <GRAEME.PRICE@NOKIA.COM>
Fri, 15 Oct 2010 14:32:18 +0100
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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-9BBDFF77-5E2C-4E13-BEB3-716CC80B3375" xml:lang="en"><title>SDIO Implementation Guide</title><shortdesc>How to port the SDIO Controller for your platform to provide
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the SDIO adaptation.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
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<p>The SDIO implementation shares most of its functionality with the
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Secure Digital (SD) Controller, which in turn extends the MultiMedia
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Card (MMC) Controller. SDIO adds support for data transfer between
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Input/Output hardware included on SDIO peripherals. The SDIO Controller
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initializes SDIO peripherals and provides an API so that class drivers
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can access the SDIO services.</p>
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<p>Providing an SDIO adaptation for your platform means porting the
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SDIO Controller. This is done by providing platform specific implementations
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of the SDIO SHAI interface functions.</p>
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<section id="GUID-64516BCF-2245-46DF-9E7F-FFC18AC7F691"><title>Prerequisites</title><p>SDIO depends on SD and MMC: the SDIO protocol is a super-set of
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the SD protocol (and of the MMC protocol). Therefore, in addition
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to the SDIO standard, you need to know about the following:<ul>
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<li><p>SD (Secure Digital)</p></li>
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<li><p>MMC (MultiMedia Card)</p></li>
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</ul></p>     </section>
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<section id="GUID-A6598353-0AC5-4DB0-82AD-C2F397CB5CD0"><title>Architecture</title><p>The following diagram illustrates the implementation of the SDIO
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extension for the MMC Controller. The classes in green provide the
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hardware interface and the classes in blue implement the platform-specific
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functions.</p><fig id="GUID-AA66D99B-9EF2-4803-8D43-A3BDA180C9C9">
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<title>SDIO Controller classes</title>
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<image href="GUID-D5030CC5-1FC1-40F3-9D68-4A454B25C58B_d0e103563_href.png" placement="inline"/>
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</fig></section>
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<section id="GUID-20DF01A9-64AF-45E6-8F22-2E384F4177EA"><title>Implementation</title>The Platform-Independent Layer (PIL) of the SDIO Controller is made
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up from three sets of files described in the following table:<p><table id="GUID-54A82958-4168-42CD-81DE-466CEA0FEEFC-GENID-1-2-1-10-1-5-1-9-1-1-8-1-5-1-3-5-2-1">
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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 valign="top">Standard</entry>
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<entry valign="top">Source code location</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>MMC</entry>
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<entry><p><filepath>os/kernelhwsrv/kernel/eka/drivers/pbus/mmc</filepath></p><p>See also <xref href="GUID-40F2BC43-5022-5F4E-B445-56FEF43FEB8B.dita">Code Organization</xref> in the MMC section.</p></entry>
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</row>
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<row>
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<entry>SD</entry>
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<entry><filepath>os/kernelhwsrv/kernel/eka/drivers/pbus/mmc/sdcard/sdcard3c/</filepath><p>Also see <xref href="GUID-E194A923-99E7-5DC1-BB78-D050A4793A60.dita#GUID-E194A923-99E7-5DC1-BB78-D050A4793A60/GUID-59DA32AA-97F3-4001-9B6F-887E986C633D">Source Code</xref> in the SD section.</p></entry>
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</row>
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<row>
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<entry>SDIO</entry>
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<entry><filepath>os/kernelhwsrv/kernel/eka/drivers/pbus/mmc/sdcard/sdcard3c/sdio/</filepath></entry>
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</row>
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</tbody>
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</tgroup>
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</table></p><p>The Platform-Specific Layer (PSL) should be located
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in a variant directory and have a similar folder hierarchy to the
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PIL. It should provide the following implementations:<ul>
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<li><p>Stack</p></li>
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<li><p>Power Supply Unit (PSU)</p></li>
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</ul> These implementations are discussed in the tutorials:<ul>
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<li><p><xref href="GUID-2344B900-5EC5-4467-BEAD-AB55C88CE63E.dita">SDIO
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Stack Implementation Tutorial</xref></p></li>
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<li><p><xref href="GUID-7E3BBB18-3113-4312-AD91-897DE87C58BF.dita">SDIO
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PSU Implementation Tutorial</xref></p></li>
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</ul></p></section>
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</conbody></concept>
FCL/sftools/depl/docscontent