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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"><span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" 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><div class="date inPage">4 Dec 2024</div><div style="color: gray;">
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Read time: 2 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><p class="- topic/p p" data-ofbid="d216883e23__20250121171644">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="d216883e30__20250121171644"><span class="- topic/ph ph">属于 HAL 层接口，</span>记录 DMA
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控制器的配置信息：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dma_data_structure__codeblock_f4b_gwf_f1c" data-ofbid="dma_data_structure__codeblock_f4b_gwf_f1c"><strong class="hl-keyword">struct</strong> aic_dma_dev {
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<strong class="hl-keyword">struct</strong> aic_dma_task task[TASK_MAX_NUM];
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s32 inited;
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<strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">long</strong> base;
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u32 burst_length; <em class="hl-comment">/* burst length capacity */</em>
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u32 addr_widths; <em class="hl-comment">/* address width support capacity */</em>
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<strong class="hl-keyword">struct</strong> aic_dma_chan dma_chan[AIC_DMA_CH_NUM];
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<strong class="hl-keyword">struct</strong> aic_dma_task *freetask;
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};</pre></div>
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</section><section class="- topic/section section" id="dma_data_structure__section_ljm_1wt_mdc" data-ofbid="dma_data_structure__section_ljm_1wt_mdc"><h2 class="- topic/title title sectiontitle">struct aic_dma_chan</h2>
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<div class="- topic/p p" data-ofbid="d216883e42__20250121171644">属于 HAL 层接口，记录了一个 DMA
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物理通道对应的通道号、寄存器基地址等信息<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dma_data_structure__codeblock_h5z_mwf_f1c" data-ofbid="dma_data_structure__codeblock_h5z_mwf_f1c"><strong class="hl-keyword">struct</strong> aic_dma_chan {
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u8 ch_nr; <em class="hl-comment">/* drq port number */</em>
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u8 used;
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u8 irq_type; <em class="hl-comment">/* irq types */</em>
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bool cyclic; <em class="hl-comment">/* flag to mark if cyclic transfer one package */</em>
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bool memset;
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<strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">long</strong> base;
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<strong class="hl-keyword">struct</strong> dma_slave_config cfg;
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<strong class="hl-keyword">volatile</strong> <strong class="hl-keyword">int</strong> lock;
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dma_async_callback callback;
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<strong class="hl-keyword">void</strong> *callback_param;
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<strong class="hl-keyword">struct</strong> aic_dma_task * desc;
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};</pre></div>
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</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>
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<p class="- topic/p p" data-ofbid="d216883e54__20250121171644">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
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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>
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<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>
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<div class="- topic/p p" data-ofbid="d216883e65__20250121171644">
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<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> <span class="+ topic/keyword pr-d/parmname keyword parmname">End Flag</span> 是 DMA
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控制器硬件预先定义好的一个数值，值为 0xfffff800。</div>
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</div>
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<div class="- topic/p p" data-ofbid="d216883e74__20250121171644">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"><strong class="hl-keyword">struct</strong> aic_dma_task {
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u32 cfg; <em class="hl-comment">/* DMA transfer configuration */</em>
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u32 src; <em class="hl-comment">/* source address of one transfer package */</em>
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u32 dst; <em class="hl-comment">/* destination address of one transfer package */</em>
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u32 len; <em class="hl-comment">/* data length of one transfer package */</em>
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u32 delay; <em class="hl-comment">/* time delay for period transfer */</em>
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u32 p_next; <em class="hl-comment">/* next task node for DMA controller */</em>
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u32 mode; <em class="hl-comment">/* the negotiation mode */</em>
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<em class="hl-comment">/*
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* virtual list for driver maintain package list,
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* not used by DMA controller
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*/</em>
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<strong class="hl-keyword">struct</strong> aic_dma_task *v_next;
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};</pre></div>
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</section><section class="- topic/section section" id="dma_data_structure__section_bkc_jds_cdc" data-ofbid="dma_data_structure__section_bkc_jds_cdc"><h2 class="- topic/title title sectiontitle">struct dma_slave_config</h2>
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<div class="- topic/p p" data-ofbid="d216883e84__20250121171644">DAM 通道的配置信息，和 Linux DMA Engine
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接口的定义保持一致。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dma_data_structure__codeblock_v3f_rsy_bdc" data-ofbid="dma_data_structure__codeblock_v3f_rsy_bdc"><strong class="hl-keyword">struct</strong> dma_slave_config {
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<strong class="hl-keyword">enum</strong> dma_transfer_direction direction;
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<strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">long</strong> src_addr;
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<strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">long</strong> dst_addr;
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<strong class="hl-keyword">enum</strong> dma_slave_buswidth src_addr_width;
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<strong class="hl-keyword">enum</strong> dma_slave_buswidth dst_addr_width;
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uint32_t src_maxburst;
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uint32_t dst_maxburst;
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uint32_t slave_id;
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};</pre></div>
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</section></div></article></main></div>
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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_ljm_1wt_mdc" data-tocid="dma_data_structure__section_ljm_1wt_mdc">struct aic_dma_chan</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><li class="section-item"><div class="section-title"><a href="#dma_data_structure__section_bkc_jds_cdc" data-tocid="dma_data_structure__section_bkc_jds_cdc">struct dma_slave_config</a></div></li></ul></div>
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