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1 <?xml version="1.0" encoding="utf-8"?> |
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2 <!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. --> |
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3 <!-- This component and the accompanying materials are made available under the terms of the License |
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4 "Eclipse Public License v1.0" which accompanies this distribution, |
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5 and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". --> |
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6 <!-- Initial Contributors: |
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7 Nokia Corporation - initial contribution. |
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8 Contributors: |
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9 --> |
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10 <!DOCTYPE concept |
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11 PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> |
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12 <concept id="GUID-6114133F-E738-4DF1-8308-B09C02B9CEEA" xml:lang="en"><title>DMAv2 Interface Overview</title><shortdesc>Describes the interfaces provided by the DMAv2 platform |
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13 service.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody> |
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14 <section id="GUID-37ADE1EE-C4AB-41FD-B639-DE447AA4BD53"><title>Client |
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15 functions</title><p>The clients that require to use the DMA framework |
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16 functionality use the <xref href="GUID-780F4D53-5546-3B69-B328-0226C70EBDE2.dita"><apiname>DDmaRequest</apiname></xref> class functions |
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17 to request DMA transfers. The clients should not set any parameters |
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18 directly but use functions of the <xref href="GUID-780F4D53-5546-3B69-B328-0226C70EBDE2.dita"><apiname>DDmaRequest</apiname></xref> class.</p><table id="GUID-B53C9C8A-C5D5-4CA2-A81B-85D5EF9F86EA"> |
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19 <tgroup cols="2"><colspec colname="col1" colwidth="1.00*"/><colspec colname="col2" colwidth="1.00*"/> |
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20 <thead> |
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21 <row> |
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22 <entry>API</entry> |
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23 <entry>Description</entry> |
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24 </row> |
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25 </thead> |
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26 <tbody> |
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27 <row> |
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28 <entry><xref href="GUID-780F4D53-5546-3B69-B328-0226C70EBDE2.dita#GUID-780F4D53-5546-3B69-B328-0226C70EBDE2/GUID-311897BE-5079-3945-A299-333B9B8E4071"><apiname>DDmaRequest::DDmaRequest(TDmaChannel& aChannel, |
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29 TCallback, TAny*, TInt)</apiname></xref></entry> |
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30 <entry>The constructor for the <codeph>DDmaRequest</codeph> class. </entry> |
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31 </row> |
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32 <row> |
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33 <entry><xref href="GUID-780F4D53-5546-3B69-B328-0226C70EBDE2.dita#GUID-780F4D53-5546-3B69-B328-0226C70EBDE2/GUID-55E31857-CCA8-3463-BB72-D45A8952A39F"><apiname>DDmaRequest::Fragment(const TDmaTransferArgs& |
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34 aTransferArgs)</apiname></xref></entry> |
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35 <entry>Split request into a list of fragments small enough to be fed |
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36 to the DMA Controller. The size of the fragment should be less than |
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37 or equal to the maximum transfer size supported by the DMA controller.</entry> |
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38 </row> |
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39 <row> |
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40 <entry><xref href="GUID-780F4D53-5546-3B69-B328-0226C70EBDE2.dita#GUID-780F4D53-5546-3B69-B328-0226C70EBDE2/GUID-0A83F782-DB62-39ED-8D32-DBD5949C8D3F"><apiname>DDmaRequest::Queue()</apiname></xref></entry> |
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41 <entry>Asynchronous transfer request.</entry> |
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42 </row> |
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43 <row> |
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44 <entry><xref href="GUID-780F4D53-5546-3B69-B328-0226C70EBDE2.dita#GUID-780F4D53-5546-3B69-B328-0226C70EBDE2/GUID-E91276AA-EC8A-39C7-802F-22F713E2BBAC"><apiname>DDmaRequest::ExpandDesList(TInt)</apiname></xref></entry> |
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45 <entry>Add new descriptors to the existing list. The function is to |
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46 be used by the clients that require to build a custom descriptor list.</entry> |
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47 </row> |
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48 <row> |
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49 <entry><xref href="GUID-780F4D53-5546-3B69-B328-0226C70EBDE2.dita#GUID-780F4D53-5546-3B69-B328-0226C70EBDE2/GUID-8A34A869-3593-308E-93CC-36951C8B310B"><apiname>DDmaRequest::ExpandSrcDesList(TInt)</apiname></xref></entry> |
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50 <entry>Add new descriptors to the existing source port descriptor |
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51 list.</entry> |
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52 </row> |
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53 <row> |
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54 <entry><xref href="GUID-780F4D53-5546-3B69-B328-0226C70EBDE2.dita#GUID-780F4D53-5546-3B69-B328-0226C70EBDE2/GUID-6A9CE3CA-BECF-3A8C-802A-D53FBB152627"><apiname>DDmaRequest::ExpandDstDesList(TInt)</apiname></xref></entry> |
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55 <entry>Add new descriptors to the existing destination port descriptor |
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56 list.</entry> |
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57 </row> |
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58 <row> |
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59 <entry><xref href="GUID-780F4D53-5546-3B69-B328-0226C70EBDE2.dita#GUID-780F4D53-5546-3B69-B328-0226C70EBDE2/GUID-6E1A6759-E6E0-3C04-BEED-318AF42A892F"><apiname>DDmaRequest::FreeDesList()</apiname></xref></entry> |
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60 <entry>Free resources associated with this request.</entry> |
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61 </row> |
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62 <row> |
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63 <entry><xref href="GUID-780F4D53-5546-3B69-B328-0226C70EBDE2.dita#GUID-780F4D53-5546-3B69-B328-0226C70EBDE2/GUID-57047E56-CEC0-364D-A276-6F66AC2B2F3F"><apiname>DDmaRequest::FreeSrcDesList()</apiname></xref></entry> |
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64 <entry>Free resources associated with this request from the source |
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65 port descriptor chain.</entry> |
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66 </row> |
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67 <row> |
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68 <entry><xref href="GUID-780F4D53-5546-3B69-B328-0226C70EBDE2.dita#GUID-780F4D53-5546-3B69-B328-0226C70EBDE2/GUID-1826EE8C-817B-3086-B524-CEC9329007DC"><apiname>DDmaRequest::FreeDstDesList()</apiname></xref></entry> |
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69 <entry>Free resources associated with this request from the destination |
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70 port descriptor chain.</entry> |
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71 </row> |
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72 <row> |
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73 <entry><xref href="GUID-780F4D53-5546-3B69-B328-0226C70EBDE2.dita#GUID-780F4D53-5546-3B69-B328-0226C70EBDE2/GUID-C5CFD281-7E51-3366-8BAE-1D702F9BD142"><apiname>DDmaRequest::EnableSrcElementCounting(TBool)</apiname></xref></entry> |
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74 <entry>Enables the functionality for counting the transferred source |
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75 elements.</entry> |
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76 </row> |
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77 <row> |
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78 <entry><xref href="GUID-780F4D53-5546-3B69-B328-0226C70EBDE2.dita#GUID-780F4D53-5546-3B69-B328-0226C70EBDE2/GUID-7C978E94-20B0-3445-9785-4135FAEFAFE3"><apiname>DDmaRequest::EnableDstElementCounting(TBool)</apiname></xref></entry> |
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79 <entry>Enables the functionality for counting the transferred destination |
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80 elements.</entry> |
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81 </row> |
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82 <row> |
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83 <entry><xref href="GUID-780F4D53-5546-3B69-B328-0226C70EBDE2.dita#GUID-780F4D53-5546-3B69-B328-0226C70EBDE2/GUID-ED613C3E-CD72-342B-B8A1-F26F4B3319A8"><apiname>DDmaRequest::DisableSrcElementCounting()</apiname></xref></entry> |
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84 <entry>Disables the functionality for counting the transferred source |
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85 elements.</entry> |
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86 </row> |
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87 <row> |
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88 <entry><xref href="GUID-780F4D53-5546-3B69-B328-0226C70EBDE2.dita#GUID-780F4D53-5546-3B69-B328-0226C70EBDE2/GUID-021492C7-B778-3F58-A097-376A414B40B6"><apiname>DDmaRequest::DisableDstElementCounting()</apiname></xref></entry> |
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89 <entry>Disables the functionality for counting the transferred destination |
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90 elements.</entry> |
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91 </row> |
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92 <row> |
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93 <entry><xref href="GUID-780F4D53-5546-3B69-B328-0226C70EBDE2.dita#GUID-780F4D53-5546-3B69-B328-0226C70EBDE2/GUID-6613A1DA-1E18-34A8-9FD8-4DE9269FA2B9"><apiname>DDmaRequest::TotalNumSrcElementsTransferred()</apiname></xref></entry> |
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94 <entry>Get the number of transferred elements at the source port. |
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95 This function can only be used if the counting is enabled.</entry> |
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96 </row> |
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97 <row> |
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98 <entry><xref href="GUID-780F4D53-5546-3B69-B328-0226C70EBDE2.dita#GUID-780F4D53-5546-3B69-B328-0226C70EBDE2/GUID-5B1350AB-FFF6-3172-BB08-B50925CB89E9"><apiname>DDmaRequest::TotalNumDstElementsTransferred()</apiname></xref></entry> |
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99 <entry>Get the number of transferred elements at the destination port. |
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100 This function can only be used if the counting is enabled.</entry> |
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101 </row> |
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102 <row> |
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103 <entry><xref href="GUID-780F4D53-5546-3B69-B328-0226C70EBDE2.dita#GUID-780F4D53-5546-3B69-B328-0226C70EBDE2/GUID-A43A6A70-EEA7-31B1-A9FB-A75865D64FC4"><apiname>DDmaRequest::FragmentCount()</apiname></xref></entry> |
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104 <entry>Returns the number of fragments that are created by this transfer |
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105 request. </entry> |
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106 </row> |
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107 <row> |
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108 <entry><xref href="GUID-780F4D53-5546-3B69-B328-0226C70EBDE2.dita#GUID-780F4D53-5546-3B69-B328-0226C70EBDE2/GUID-F2B9B9ED-A2DF-3E43-A080-323CC67CD9DD"><apiname>DDmaRequest::SrcFragmentCount()</apiname></xref></entry> |
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109 <entry>Returns the number of source port fragments that are created |
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110 by this transfer request.</entry> |
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111 </row> |
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112 <row> |
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113 <entry><xref href="GUID-780F4D53-5546-3B69-B328-0226C70EBDE2.dita#GUID-780F4D53-5546-3B69-B328-0226C70EBDE2/GUID-74BEEB4D-04B6-3722-A7CD-8ED9EE3267AC"><apiname>DDmaRequest::DstFragmentCount()</apiname></xref></entry> |
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114 <entry>Returns the number of destination port fragments that are created |
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115 by this transfer request.</entry> |
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116 </row> |
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117 <row> |
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118 <entry><xref href="GUID-83882548-FAC5-3EFF-92ED-14D1D9A85D37.dita#GUID-83882548-FAC5-3EFF-92ED-14D1D9A85D37/GUID-C10135FD-8CCB-3032-9865-F86A8428A54D"><apiname>TDmaChannel::Open(const SCreateInfo& aInfo, TDmaChannel*& |
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119 aChannel)</apiname></xref></entry> |
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120 <entry>Open a specified channel.</entry> |
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121 </row> |
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122 <row> |
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123 <entry><xref href="GUID-83882548-FAC5-3EFF-92ED-14D1D9A85D37.dita#GUID-83882548-FAC5-3EFF-92ED-14D1D9A85D37/GUID-8204AFBD-2A60-372E-B626-35BD19851FF7"><apiname>TDmaChannel::Close()</apiname></xref></entry> |
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124 <entry>Close a previously opened channel.</entry> |
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125 </row> |
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126 <row> |
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127 <entry><xref href="GUID-83882548-FAC5-3EFF-92ED-14D1D9A85D37.dita#GUID-83882548-FAC5-3EFF-92ED-14D1D9A85D37/GUID-0588547C-300B-3558-8173-E7581956D8DB"><apiname>TDmaChannel::LinkToChannel(TDmaChannel* aChannel)</apiname></xref></entry> |
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128 <entry>Logically link a channel with the specified argument. When |
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129 the argument is NULL the channel is unlinked.</entry> |
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130 </row> |
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131 <row> |
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132 <entry><xref href="GUID-83882548-FAC5-3EFF-92ED-14D1D9A85D37.dita#GUID-83882548-FAC5-3EFF-92ED-14D1D9A85D37/GUID-39306527-CBB8-3C89-90F5-BB21A7F34A0F"><apiname>TDmaChannel::Pause()</apiname></xref></entry> |
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133 <entry>Pause an active transfer.</entry> |
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134 </row> |
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135 <row> |
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136 <entry><xref href="GUID-83882548-FAC5-3EFF-92ED-14D1D9A85D37.dita#GUID-83882548-FAC5-3EFF-92ED-14D1D9A85D37/GUID-5BC3DDA2-D6EB-375D-9FFC-DD40F26BD01C"><apiname>TDmaChannel::Resume()</apiname></xref></entry> |
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137 <entry>Resume transfer on this channel.</entry> |
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138 </row> |
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139 <row> |
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140 <entry><xref href="GUID-83882548-FAC5-3EFF-92ED-14D1D9A85D37.dita#GUID-83882548-FAC5-3EFF-92ED-14D1D9A85D37/GUID-0A98D2DC-2A61-3FBD-AB7A-623FE926A183"><apiname>TDmaChannel::CancelAll()</apiname></xref></entry> |
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141 <entry>Cancel current and all pending requests.</entry> |
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142 </row> |
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143 <row> |
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144 <entry><xref href="GUID-83882548-FAC5-3EFF-92ED-14D1D9A85D37.dita#GUID-83882548-FAC5-3EFF-92ED-14D1D9A85D37/GUID-FC57221E-0C3D-3150-80DC-B3532725607F"><apiname>TDmaChannel::MaxTransferLength(TUint aSrcFlags, TUint |
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145 aDstFlags, TUint32 aPslInfo)</apiname></xref></entry> |
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146 <entry>Get the maximum transfer length of the current channel.</entry> |
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147 </row> |
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148 <row> |
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149 <entry><xref href="GUID-83882548-FAC5-3EFF-92ED-14D1D9A85D37.dita#GUID-83882548-FAC5-3EFF-92ED-14D1D9A85D37/GUID-F53A4F88-971E-37E9-973E-33DF9AD4847A"><apiname>TDmaChannel::AddressAlignMask(TUint aTargetFlags, |
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150 TUint aElementSize, TUint32 aPslInfo)</apiname></xref></entry> |
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151 <entry>Get the address or memory alignment mask.</entry> |
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152 </row> |
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153 <row> |
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154 <entry><xref href="GUID-83882548-FAC5-3EFF-92ED-14D1D9A85D37.dita#GUID-83882548-FAC5-3EFF-92ED-14D1D9A85D37/GUID-4DCC8674-E4C7-365B-AE19-244F62C2273D"><apiname>TDmaChannel::DmacCaps()</apiname></xref></entry> |
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155 <entry>Get the reference to the structure that contains the features |
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156 and the capabilities of the DMAC associated with the current channel.</entry> |
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157 </row> |
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158 <row> |
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159 <entry><xref href="GUID-83882548-FAC5-3EFF-92ED-14D1D9A85D37.dita#GUID-83882548-FAC5-3EFF-92ED-14D1D9A85D37/GUID-5C1CB8FB-31BC-3968-A5BD-B187EE0051D0"><apiname>TDmaChannel::IsrRedoRequest(TUint32 aSrcAddr=KPhysAddrInvalid, |
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160 TUint32 aDstAddr=KPhysAddrInvalid, TUint aTransferCount=0, TUint32 |
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161 aPslRequestInfo=0, TBool aIsrCb=ETrue)</apiname></xref></entry> |
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162 <entry>Repeat the current transfer request with modified parameters.</entry> |
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163 </row> |
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164 <row> |
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165 <entry><xref href="GUID-83882548-FAC5-3EFF-92ED-14D1D9A85D37.dita#GUID-83882548-FAC5-3EFF-92ED-14D1D9A85D37/GUID-B3887AA6-FEB6-3109-A98A-2854ED903628"><apiname>TDmaChannel::IsQueueEmpty()</apiname></xref></entry> |
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166 <entry>Check if the current transfer queue is empty.</entry> |
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167 </row> |
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168 <row> |
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169 <entry><xref href="GUID-83882548-FAC5-3EFF-92ED-14D1D9A85D37.dita#GUID-83882548-FAC5-3EFF-92ED-14D1D9A85D37/GUID-A84A0711-4573-3ED1-A20E-759215F21255"><apiname>TDmaChannel::PslId()</apiname></xref></entry> |
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170 <entry>Get the PSL specific ID of the current channel. This function |
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171 is used for debugging by the PIL.</entry> |
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172 </row> |
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173 <row> |
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174 <entry><xref href="GUID-83882548-FAC5-3EFF-92ED-14D1D9A85D37.dita#GUID-83882548-FAC5-3EFF-92ED-14D1D9A85D37/GUID-B65DAEB8-C389-33DC-AD46-EFB0D34C42FC"><apiname>TDmaChannel::FailNext(TInt)</apiname></xref></entry> |
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175 <entry>Force to fail the next transfer request. This function is for |
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176 testing purpose only.</entry> |
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177 </row> |
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178 <row> |
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179 <entry><xref href="GUID-83882548-FAC5-3EFF-92ED-14D1D9A85D37.dita#GUID-83882548-FAC5-3EFF-92ED-14D1D9A85D37/GUID-640C7397-434C-3EB4-9931-9E462CE0FB22"><apiname>TDmaChannel::MissNextInterrupts(TInt)</apiname></xref></entry> |
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180 <entry>Force the DMAC to miss one or more interrupts.</entry> |
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181 </row> |
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182 <row> |
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183 <entry><xref href="GUID-83882548-FAC5-3EFF-92ED-14D1D9A85D37.dita#GUID-83882548-FAC5-3EFF-92ED-14D1D9A85D37/GUID-DEABB054-CAF1-3FC4-BC14-87581AFD5370"><apiname>TDmaChannel::Extension(TInt aCmd, TAny* aArg)</apiname></xref></entry> |
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184 <entry>Allows PSL to extend the DMA API with a channel specific functionality.</entry> |
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185 </row> |
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186 <row> |
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187 <entry><xref href="GUID-83882548-FAC5-3EFF-92ED-14D1D9A85D37.dita#GUID-83882548-FAC5-3EFF-92ED-14D1D9A85D37/GUID-89BD759C-7269-3C93-ABE2-34E6DA087DA6"><apiname>TDmaChannel::StaticExtension(TInt aCmd, TAny* aArg)</apiname></xref></entry> |
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188 <entry>Allows PSL to extend the DMA API with a channel independent |
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189 functionality.</entry> |
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190 </row> |
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191 </tbody> |
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192 </tgroup> |
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193 </table></section> |
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194 <section id="GUID-827B3A45-FB7F-4E4E-901A-BB50C2D19EC3"><title>DMA |
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195 controller implementation</title>The <xref href="GUID-25398075-927B-36E4-B953-16785EC4086C.dita"><apiname>TDmac</apiname></xref> class |
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196 provides the functions of a DMA controller:<table id="GUID-FCA888C8-F648-4A9F-8595-1ABF8AE305C5"> |
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197 <tgroup cols="2"><colspec colname="col1"/><colspec colname="col2"/> |
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198 <thead> |
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199 <row> |
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200 <entry valign="top">API</entry> |
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201 <entry valign="top">Description</entry> |
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202 </row> |
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203 </thead> |
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204 <tbody> |
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205 <row> |
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206 <entry><xref href="GUID-25398075-927B-36E4-B953-16785EC4086C.dita#GUID-25398075-927B-36E4-B953-16785EC4086C/GUID-5B418CE9-7050-3301-927E-059C55B2FC0F"><apiname>TDmac::Transfer(const TDmaChannel& aChannel, const |
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207 SDmaDesHdr& aHdr)</apiname></xref></entry> |
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208 <entry>Initiate a transfer request on a specified channel.</entry> |
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209 </row> |
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210 <row> |
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211 <entry><xref href="GUID-25398075-927B-36E4-B953-16785EC4086C.dita#GUID-25398075-927B-36E4-B953-16785EC4086C/GUID-5191C7E1-A805-3BD1-9743-76B94A457538"><apiname>TDmac::StopTransfer(const TDmaChannel& aChannel)</apiname></xref></entry> |
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212 <entry>Stop a data transfer on a specified channel.</entry> |
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213 </row> |
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214 <row> |
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215 <entry><xref href="GUID-25398075-927B-36E4-B953-16785EC4086C.dita#GUID-25398075-927B-36E4-B953-16785EC4086C/GUID-216083D9-6506-3DD0-B884-80AB16A929A2"><apiname>TDmac::IsIdle(const TDmaChannel& aChannel)</apiname></xref></entry> |
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216 <entry>Get the state of a specified channel.</entry> |
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217 </row> |
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218 <row> |
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219 <entry><xref href="GUID-25398075-927B-36E4-B953-16785EC4086C.dita#GUID-25398075-927B-36E4-B953-16785EC4086C/GUID-D6D011E9-9D75-3881-87D8-1986FFBBA106"><apiname>TDmac::Extension()</apiname></xref></entry> |
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220 <entry>Implement a platform specific functionality per channel.</entry> |
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221 </row> |
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222 </tbody> |
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223 </tgroup> |
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224 </table></section> |
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225 <section id="GUID-FD5756CA-CAA7-4259-8508-2F37E2D30C42"><title>Channel |
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226 manager implementation</title><p>The <xref href="GUID-176B8E0D-0422-341B-A134-7C85432E1303.dita"><apiname>DmaChannelMgr</apiname></xref> class provides functions to open and close the channels by the PIL. |
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227 Implement the following functions in the PSL:</p><table id="GUID-965FE251-FE92-4D1A-B35D-92E5104CBB6F"> |
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228 <tgroup cols="2"><colspec colname="col1"/><colspec colname="col2"/> |
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229 <thead> |
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230 <row> |
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231 <entry valign="top">API</entry> |
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232 <entry valign="top">Description</entry> |
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233 </row> |
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234 </thead> |
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235 <tbody> |
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236 <row> |
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237 <entry><xref href="GUID-176B8E0D-0422-341B-A134-7C85432E1303.dita#GUID-176B8E0D-0422-341B-A134-7C85432E1303/GUID-23FE411E-A058-3C6F-957C-BB36F0EBE3E6"><apiname>DmaChannelMgr::Open(TUint32 aOpenId, TBool aDynChannel, |
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238 TUint aPriority)</apiname></xref></entry> |
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239 <entry>Open a channel with a specified channel ID.</entry> |
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240 </row> |
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241 <row> |
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242 <entry><xref href="GUID-176B8E0D-0422-341B-A134-7C85432E1303.dita#GUID-176B8E0D-0422-341B-A134-7C85432E1303/GUID-909D795A-7303-3A76-9C8E-3B07A97DD716"><apiname>DmaChannelMgr::Close() </apiname></xref></entry> |
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243 <entry>Close a channel.</entry> |
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244 </row> |
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245 </tbody> |
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246 </tgroup> |
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247 </table></section> |
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248 <section id="GUID-868DC865-577F-43F2-A8F2-E5649804F1AD"><title>DMA |
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249 channel implementation</title><p>The <xref href="GUID-83882548-FAC5-3EFF-92ED-14D1D9A85D37.dita"><apiname>TDmaChannel</apiname></xref> class provides the functions to implement a DMA channel. There are |
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250 three types of DMA channels that be can be implemented as described |
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251 below.</p> <table id="GUID-7EDF7986-AA5A-456C-8BF4-0ADE3E348F65"> |
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252 <tgroup cols="2"><colspec colname="col1"/><colspec colname="col2"/> |
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253 <thead> |
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254 <row> |
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255 <entry valign="top">Class</entry> |
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256 <entry valign="top">Description</entry> |
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257 </row> |
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258 </thead> |
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259 <tbody> |
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260 <row> |
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261 <entry><xref href="GUID-A8B4AD1B-770C-363E-A0DE-C78A9786CBDC.dita"><apiname>TDmaSbChannel</apiname></xref></entry> |
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262 <entry>Class to implement a single buffer channel.</entry> |
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263 </row> |
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264 <row> |
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265 <entry><xref href="GUID-FD76AF08-6250-3054-8A06-16343E385B23.dita"><apiname>TDmaDbChannel</apiname></xref></entry> |
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266 <entry>Class to implement a double buffer channel.</entry> |
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267 </row> |
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268 <row> |
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269 <entry><xref href="GUID-2D4CFBB1-8D64-3CF5-B6F0-B24D16D5BAD4.dita"><apiname>TDmaSgChannel</apiname></xref></entry> |
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270 <entry>Class to implement a scatter-gather channel.</entry> |
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271 </row> |
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272 <row> |
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273 <entry><xref href="GUID-B0100F2B-6C01-3429-8B48-DFFB96EA85D0.dita"><apiname>TDmaAsymSgChannel</apiname></xref></entry> |
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274 <entry>Channel class for controllers using asymmetric descriptor lists.</entry> |
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275 </row> |
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276 </tbody> |
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277 </tgroup> |
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278 </table></section> |
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279 </conbody></concept> |