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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-demo.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">Demo</h1><div class="date inPage">26 Nov 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="d71724e22__20250121171522">SPI 驱动（详见 <span class="+ topic/ph sw-d/filepath ph filepath">drivers/spi/spi-artinchip.c</span>）中调用了 DMA 进行数据传输，其使用过程可以当作 Demo
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参考。</p><section class="- topic/section section" id="demo__section_qfl_wkz_xbc" data-ofbid="demo__section_qfl_wkz_xbc"><h2 class="- topic/title title sectiontitle">DMA 通道的申请</h2>
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<div class="- topic/p p" data-ofbid="d71724e32__20250121171522">
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="demo__codeblock_wqc_3qs_c1c" data-ofbid="demo__codeblock_wqc_3qs_c1c"><strong class="hl-keyword">static</strong> <strong class="hl-keyword">int</strong> aic_spi_probe(<strong class="hl-keyword">struct</strong> platform_device *pdev)
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{
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...
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aicspi->dma_rx = dma_request_slave_channel(aicspi->dev, <span class="hl-string">"rx"</span>);
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<strong class="hl-keyword">if</strong> (!aicspi->dma_rx)
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dev_warn(aicspi->dev, <span class="hl-string">"failed to request rx dma channel\n"</span>);
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aicspi->dma_tx = dma_request_slave_channel(aicspi->dev, <span class="hl-string">"tx"</span>);
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<strong class="hl-keyword">if</strong> (!aicspi->dma_tx)
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dev_warn(aicspi->dev, <span class="hl-string">"failed to request tx dma channel\n"</span>);
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...
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}</pre>
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</div>
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</section><section class="- topic/section section" id="demo__section_n52_mzt_mdc" data-ofbid="demo__section_n52_mzt_mdc"><h2 class="- topic/title title sectiontitle">DMA 数据提交</h2>
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<div class="- topic/p p" data-ofbid="d71724e43__20250121171522">
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="demo__codeblock_dz3_3qs_c1c" data-ofbid="demo__codeblock_dz3_3qs_c1c"><strong class="hl-keyword">static</strong> <strong class="hl-keyword">int</strong> aic_spi_dma_rx_cfg(<strong class="hl-keyword">struct</strong> aic_spi *aicspi, <strong class="hl-keyword">struct</strong> spi_transfer *t)
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{
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<strong class="hl-keyword">struct</strong> dma_async_tx_descriptor *dma_desc = NULL;
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<strong class="hl-keyword">struct</strong> dma_slave_config dma_conf = {<span class="hl-number">0</span>};
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dma_conf.direction = DMA_DEV_TO_MEM;
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dma_conf.src_addr = aicspi->dma_addr_rx;
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dma_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_<span class="hl-number">1</span>_BYTE;
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dma_conf.dst_addr_width = DMA_SLAVE_BUSWIDTH_<span class="hl-number">1</span>_BYTE;
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dma_conf.src_maxburst = <span class="hl-number">1</span>;
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dma_conf.dst_maxburst = <span class="hl-number">1</span>;
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dmaengine_slave_config(aicspi->dma_rx, &dma_conf);
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dma_desc = dmaengine_prep_slave_sg(aicspi->dma_rx, t->rx_sg.sgl,
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t->rx_sg.nents, dma_conf.direction,
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DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
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<strong class="hl-keyword">if</strong> (!dma_desc) {
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dev_err(aicspi->dev, <span class="hl-string">"spi-%d prepare slave sg failed.\n"</span>,
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aicspi->ctlr->bus_num);
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<strong class="hl-keyword">return</strong> -EINVAL;
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}
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dma_desc->callback = aic_spi_dma_cb_rx;
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dma_desc->callback_param = (<strong class="hl-keyword">void</strong> *)aicspi;
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dmaengine_submit(dma_desc);
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<strong class="hl-keyword">return</strong> <span class="hl-number">0</span>;
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}</pre>
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</div>
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</section><section class="- topic/section section" id="demo__section_kt4_mzt_mdc" data-ofbid="demo__section_kt4_mzt_mdc"><h2 class="- topic/title title sectiontitle">启动 DMA 数据传输</h2>
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<div class="- topic/p p" data-ofbid="d71724e54__20250121171522">
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="demo__codeblock_mln_3qs_c1c" data-ofbid="demo__codeblock_mln_3qs_c1c"><strong class="hl-keyword">static</strong> <strong class="hl-keyword">int</strong> aic_spi_dma_rx_start(<strong class="hl-keyword">struct</strong> spi_device *spi, <strong class="hl-keyword">struct</strong> spi_transfer *t)
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{
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<strong class="hl-keyword">struct</strong> aic_spi *aicspi = spi_controller_get_devdata(spi->master);
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<strong class="hl-keyword">int</strong> ret = <span class="hl-number">0</span>;
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spi_ctlr_dma_rx_enable(aicspi->base_addr);
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ret = aic_spi_dma_rx_cfg(aicspi, t);
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<strong class="hl-keyword">if</strong> (ret < <span class="hl-number">0</span>)
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<strong class="hl-keyword">return</strong> ret;
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dma_async_issue_pending(aicspi->dma_rx);
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<strong class="hl-keyword">return</strong> ret;
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}
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</pre>
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</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="#demo__section_qfl_wkz_xbc" data-tocid="demo__section_qfl_wkz_xbc">DMA 通道的申请</a></div></li><li class="section-item"><div class="section-title"><a href="#demo__section_n52_mzt_mdc" data-tocid="demo__section_n52_mzt_mdc">DMA 数据提交</a></div></li><li class="section-item"><div class="section-title"><a href="#demo__section_kt4_mzt_mdc" data-tocid="demo__section_kt4_mzt_mdc">启动 DMA 数据传输</a></div></li></ul></div>
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