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+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
+<!-- This component and the accompanying materials are made available under the terms of the License 
+"Eclipse Public License v1.0" which accompanies this distribution, 
+and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
+<!-- Initial Contributors:
+    Nokia Corporation - initial contribution.
+Contributors: 
+-->
+<!DOCTYPE concept
+  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
+<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
+the SDIO adaptation.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
+<p>The SDIO implementation shares most of its functionality with the
+Secure Digital (SD) Controller, which in turn extends the MultiMedia
+Card (MMC) Controller. SDIO adds support for data transfer between
+Input/Output hardware included on SDIO peripherals. The SDIO Controller
+initializes SDIO peripherals and provides an API so that class drivers
+can access the SDIO services.</p>
+<p>Providing an SDIO adaptation for your platform means porting the
+SDIO Controller. This is done by providing platform specific implementations
+of the SDIO SHAI interface functions.</p>
+<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
+the SD protocol (and of the MMC protocol). Therefore, in addition
+to the SDIO standard, you need to know about the following:<ul>
+<li><p>SD (Secure Digital)</p></li>
+<li><p>MMC (MultiMedia Card)</p></li>
+</ul></p>     </section>
+<section id="GUID-A6598353-0AC5-4DB0-82AD-C2F397CB5CD0"><title>Architecture</title><p>The following diagram illustrates the implementation of the SDIO
+extension for the MMC Controller. The classes in green provide the
+hardware interface and the classes in blue implement the platform-specific
+functions.</p><fig id="GUID-AA66D99B-9EF2-4803-8D43-A3BDA180C9C9">
+<title>SDIO Controller classes</title>
+<image href="GUID-D5030CC5-1FC1-40F3-9D68-4A454B25C58B_d0e103563_href.png" placement="inline"/>
+</fig></section>
+<section id="GUID-20DF01A9-64AF-45E6-8F22-2E384F4177EA"><title>Implementation</title>The Platform-Independent Layer (PIL) of the SDIO Controller is made
+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">
+<tgroup cols="2"><colspec colname="col1"/><colspec colname="col2"/>
+<thead>
+<row>
+<entry valign="top">Standard</entry>
+<entry valign="top">Source code location</entry>
+</row>
+</thead>
+<tbody>
+<row>
+<entry>MMC</entry>
+<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>
+</row>
+<row>
+<entry>SD</entry>
+<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>
+</row>
+<row>
+<entry>SDIO</entry>
+<entry><filepath>os/kernelhwsrv/kernel/eka/drivers/pbus/mmc/sdcard/sdcard3c/sdio/</filepath></entry>
+</row>
+</tbody>
+</tgroup>
+</table></p><p>The Platform-Specific Layer (PSL) should be located
+in a variant directory and have a similar folder hierarchy to the
+PIL. It should provide the following implementations:<ul>
+<li><p>Stack</p></li>
+<li><p>Power Supply Unit (PSU)</p></li>
+</ul> These implementations are discussed in the tutorials:<ul>
+<li><p><xref href="GUID-2344B900-5EC5-4467-BEAD-AB55C88CE63E.dita">SDIO
+Stack Implementation Tutorial</xref></p></li>
+<li><p><xref href="GUID-7E3BBB18-3113-4312-AD91-897DE87C58BF.dita">SDIO
+PSU Implementation Tutorial</xref></p></li>
+</ul></p></section>
+</conbody></concept>
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