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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic concept/concept topic concept" role="article" aria-labelledby="ariaid-title1">
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<span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" title="Edit this document" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/dma/dma-data-structure.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">数据结构设计</h1>
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<div class="date inPage">15 Jan 2024</div><div style="color: gray;">
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Read time: 3 minute(s)
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</div>
|
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<div class="- topic/body concept/conbody body conbody">
|
||
<p class="- topic/p p" data-ofbid="d63448e33__20250123155203">本节介绍了 DMA 数据类型及其结构描述。</p>
|
||
<section class="- topic/section section" id="dma_data_structure__section_agk_hpf_fdc" data-ofbid="dma_data_structure__section_agk_hpf_fdc"><h2 class="- topic/title title sectiontitle">struct aic_dma_dev</h2>
|
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|
||
<div class="- topic/p p" data-ofbid="d63448e41__20250123155203">记录 DMA
|
||
控制器的配置信息：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dma_data_structure__codeblock_lcm_2ps_c1c" data-ofbid="dma_data_structure__codeblock_lcm_2ps_c1c"><code><strong class="hl-keyword">struct</strong> aic_dma_dev {
|
||
<strong class="hl-keyword">void</strong> __iomem *base;
|
||
<strong class="hl-keyword">int</strong> irq;
|
||
u32 num_pchans;
|
||
u32 num_vchans;
|
||
u32 max_request;
|
||
|
||
<strong class="hl-keyword">struct</strong> clk *clk;
|
||
<strong class="hl-keyword">struct</strong> reset_control *reset;
|
||
|
||
spinlock_t lock;
|
||
<strong class="hl-keyword">struct</strong> dma_pool *pool;
|
||
<strong class="hl-keyword">struct</strong> aic_pchan *pchans;
|
||
<strong class="hl-keyword">struct</strong> aic_vchan *vchans;
|
||
<strong class="hl-keyword">const</strong> <strong class="hl-keyword">struct</strong> aic_dma_inf *dma_inf;
|
||
<strong class="hl-keyword">struct</strong> dma_device slave;
|
||
};</code></pre></div>
|
||
</section>
|
||
<section class="- topic/section section" id="dma_data_structure__section_oqb_tvt_mdc" data-ofbid="dma_data_structure__section_oqb_tvt_mdc"><h2 class="- topic/title title sectiontitle">struct aic_dma_inf</h2>
|
||
|
||
<div class="- topic/p p" data-ofbid="d63448e52__20250123155203">记录 DMA 控制器的一些特性，如通道数、端口数、Burst 长度、地址宽度，这些特性会因不同 SoC 而不同，所以此数据结构会用在
|
||
<span class="+ topic/keyword pr-d/parmname keyword parmname">of_device_id</span> 中的私有数据，配合 compatible 来区分不同的
|
||
SoC。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dma_data_structure__codeblock_eqr_fps_c1c" data-ofbid="dma_data_structure__codeblock_eqr_fps_c1c"><code><strong class="hl-keyword">struct</strong> aic_dma_inf {
|
||
u8 nr_chans; <em class="hl-comment">/* count of dma physical channels */</em>
|
||
u8 nr_ports; <em class="hl-comment">/* count of dma drq prots */</em>
|
||
u8 nr_vchans; <em class="hl-comment">/* total valid transfer types */</em>
|
||
|
||
u32 burst_length; <em class="hl-comment">/* burst length capacity */</em>
|
||
u32 addr_widths; <em class="hl-comment">/* address width support capacity */</em>
|
||
};</code></pre></div>
|
||
</section>
|
||
<section class="- topic/section section" id="dma_data_structure__section_egg_vvt_mdc" data-ofbid="dma_data_structure__section_egg_vvt_mdc"><h2 class="- topic/title title sectiontitle">DMA 通道信息</h2>
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||
|
||
<p class="- topic/p p" data-ofbid="d63448e66__20250123155203">DMA 物理通道和 DMA 虚拟通道是一对多的关系，在设计中需要互相记录对方的数据引用指针。</p>
|
||
<ul class="- topic/ul ul" id="dma_data_structure__ul_ch4_vvt_mdc" data-ofbid="dma_data_structure__ul_ch4_vvt_mdc">
|
||
<li class="- topic/li li" data-ofbid="d63448e71__20250123155203"><strong class="+ topic/ph hi-d/b ph b">DMA 物理通道信息</strong>：记录了一个 DMA
|
||
物理通道对应的通道号、寄存器基地址、对应的虚拟通道指针等。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dma_data_structure__codeblock_dh4_vvt_mdc" data-ofbid="dma_data_structure__codeblock_dh4_vvt_mdc"><code><strong class="hl-keyword">struct</strong> aic_pchan {
|
||
u32 id; <em class="hl-comment">/* DMA channel number */</em>
|
||
<strong class="hl-keyword">void</strong> __iomem *base; <em class="hl-comment">/* DMA channel control registers */</em>
|
||
<strong class="hl-keyword">struct</strong> aic_vchan *vchan; <em class="hl-comment">/* virtual channel info */</em>
|
||
};</code></pre></li>
|
||
<li class="- topic/li li" data-ofbid="d63448e78__20250123155203"><strong class="+ topic/ph hi-d/b ph b">DMA 虚拟通道信息</strong>：记录了一个 DMA 虚拟通道对应的 DRQ
|
||
端口号、传输类型、对应的物理通道指针等。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dma_data_structure__codeblock_eh4_vvt_mdc" data-ofbid="dma_data_structure__codeblock_eh4_vvt_mdc"><code><strong class="hl-keyword">struct</strong> aic_vchan {
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||
u8 port; <em class="hl-comment">/* DRQ port number */</em>
|
||
u8 irq_type; <em class="hl-comment">/* IRQ types */</em>
|
||
bool cyclic; <em class="hl-comment">/* flag to mark if cyclic transfer one package */</em>
|
||
<strong class="hl-keyword">struct</strong> aic_pchan *pchan; <em class="hl-comment">/* physical DMA channel */</em>
|
||
<strong class="hl-keyword">struct</strong> aic_desc *desc; <em class="hl-comment">/* current transfer */</em>
|
||
|
||
<em class="hl-comment">/* parameter for dmaengine */</em>
|
||
<strong class="hl-keyword">struct</strong> virt_dma_chan vc;
|
||
<strong class="hl-keyword">struct</strong> dma_slave_config cfg;
|
||
<strong class="hl-keyword">enum</strong> dma_status status;
|
||
};</code></pre></li>
|
||
</ul>
|
||
</section>
|
||
|
||
<section class="- topic/section section" id="dma_data_structure__struct-aic-dma-task" data-ofbid="dma_data_structure__struct-aic-dma-task"><h2 class="- topic/title title sectiontitle">struct aic_dma_task</h2>
|
||
|
||
|
||
<p class="- topic/p p" data-ofbid="d63448e94__20250123155203">DMA 控制器支持散列 (Scatter Gather) 的描述符参数形式，需要提前将参数分组打包到多个描述符中，一个 Buffer
|
||
对应一组散列参数。这些描述符会组成一个链表，然后将这个链表的第一个描述符的物理地址传给 DMA 控制器。描述符组成的链表结构如下图：</p>
|
||
<figure class="- topic/fig fig fignone" id="dma_data_structure__id10" data-ofbid="dma_data_structure__id10">
|
||
|
||
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="dma_data_structure__image_qqc_33d_bdc" src="../../../images/dma/dma_task.png" width="480" alt="dma_task"/></div><br/>
|
||
<figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 1</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">DMA 描述符链表的结构示意图</span></figcaption></figure>
|
||
<div class="- topic/p p" data-ofbid="d63448e110__20250123155203">
|
||
<div class="- topic/note note tip note_tip" id="dma_data_structure__note_fkr_cny_bdc" data-ofbid="dma_data_structure__note_fkr_cny_bdc"><span class="note__title">提示：</span> <div class="note__body"><span class="+ topic/keyword pr-d/parmname keyword parmname">End Flag</span> 是 DMA
|
||
控制器硬件预先定义好的一个数值，值为 0xfffff800。</div></div>
|
||
</div>
|
||
<div class="- topic/p p" data-ofbid="d63448e119__20250123155203">DMA 描述符的数据结构定义如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dma_data_structure__codeblock_vqb_jwt_mdc" data-ofbid="dma_data_structure__codeblock_vqb_jwt_mdc"><code><strong class="hl-keyword">struct</strong> aic_dma_task {
|
||
u32 cfg; <em class="hl-comment">/* DMA transfer configuration */</em>
|
||
u32 src; <em class="hl-comment">/* source address of one transfer package */</em>
|
||
u32 dst; <em class="hl-comment">/* destination address of one transfer package */</em>
|
||
u32 len; <em class="hl-comment">/* data length of one transfer package */</em>
|
||
u32 delay; <em class="hl-comment">/* time delay for period transfer */</em>
|
||
u32 p_next; <em class="hl-comment">/* next task node for DMA controller */</em>
|
||
u32 mode; <em class="hl-comment">/* the negotiation mode */</em>
|
||
|
||
<em class="hl-comment">/*
|
||
* virtual list for driver maintain package list,
|
||
* not used by DMA controller
|
||
*/</em>
|
||
<strong class="hl-keyword">struct</strong> aic_dma_task *v_next;
|
||
|
||
};</code></pre></div>
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</section>
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<div class=" wh_topic_toc "><div class="wh_topic_label">在本页上</div><ul><li class="section-item"><div class="section-title"><a href="#dma_data_structure__section_agk_hpf_fdc" data-tocid="dma_data_structure__section_agk_hpf_fdc">struct aic_dma_dev</a></div></li><li class="section-item"><div class="section-title"><a href="#dma_data_structure__section_oqb_tvt_mdc" data-tocid="dma_data_structure__section_oqb_tvt_mdc">struct aic_dma_inf</a></div></li><li class="section-item"><div class="section-title"><a href="#dma_data_structure__section_egg_vvt_mdc" data-tocid="dma_data_structure__section_egg_vvt_mdc">DMA 通道信息</a></div></li><li class="section-item"><div class="section-title"><a href="#dma_data_structure__struct-aic-dma-task" data-tocid="dma_data_structure__struct-aic-dma-task">struct aic_dma_task</a></div></li></ul></div>
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