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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/spi/spi-key_procedures.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">关键流程设计</h1><div class="date inPage">3 Dec 2024</div><div style="color: gray;">
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Read time: 1 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><section class="- topic/section section" id="spi_key_procedures__section_kmx_twy_21c" data-ofbid="spi_key_procedures__section_kmx_twy_21c"><h2 class="- topic/title title sectiontitle">初始化流程</h2>
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<div class="- topic/p p" data-ofbid="d233093e27__20250121171654">
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="spi_key_procedures__codeblock_lmy_5wy_21c" data-ofbid="spi_key_procedures__codeblock_lmy_5wy_21c">aic_spi_probe();
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|-> irq = platform_get_irq(pdev, <span class="hl-number">0</span>);
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|-> ctlr = spi_alloc_master(&pdev->dev, <strong class="hl-keyword">sizeof</strong>(<strong class="hl-keyword">struct</strong> aic_spi));
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|-> platform_set_drvdata(pdev, ctlr);
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|-> aicspi->dma_rx = dma_request_slave_channel(aicspi->dev, <span class="hl-string">"rx"</span>);
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|-> aicspi->dma_tx = dma_request_slave_channel(aicspi->dev, <span class="hl-string">"tx"</span>);
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|-> request_irq(aicspi->irq, aic_spi_handle_irq, <span class="hl-number">0</span>, aicspi->dev_name, aicspi);
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|-> spi_register_controller(ctlr);</pre>
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</div>
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</section><section class="- topic/section section" id="spi_key_procedures__section_ip3_5wy_21c" data-ofbid="spi_key_procedures__section_ip3_5wy_21c"><h2 class="- topic/title title sectiontitle">中断流程</h2>
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<div class="- topic/p p" data-ofbid="d233093e38__20250121171654">SPI 控制器驱动中的中断处理并不复杂，当中断发生时，首先在 irq handler 中读取相关状态寄存器，
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然后判断如何处理：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="spi_key_procedures__codeblock_lkb_vwy_21c" data-ofbid="spi_key_procedures__codeblock_lkb_vwy_21c"><strong class="hl-keyword">static</strong> irqreturn_t aic_spi_handle_irq(<strong class="hl-keyword">int</strong> irq, <strong class="hl-keyword">void</strong> *dev_id)
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{
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...
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spi_ctlr_pending_irq_clr(status, base_addr);
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<em class="hl-comment">/* master mode, Transfer Complete Interrupt */</em>
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<strong class="hl-keyword">if</strong> (status & ISR_BIT_TC) {
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...
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spi_ctlr_irq_disable(ISR_BIT_TC | ISR_BIT_ERRS, base_addr);
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spi_finalize_current_transfer(aicspi->ctlr); <em class="hl-comment">// 传输完成，通知调用者</em>
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...
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<strong class="hl-keyword">return</strong> IRQ_HANDLED;
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} <strong class="hl-keyword">else</strong> <strong class="hl-keyword">if</strong> (status & ISR_BIT_ERRS) {
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...
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spi_ctlr_irq_disable(ISR_BIT_TC | ISR_BIT_ERRS, base_addr);
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spi_ctlr_soft_reset(base_addr); <em class="hl-comment">// 传输出错，reset 控制器</em>
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spi_finalize_current_transfer(aicspi->ctlr);
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...
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<strong class="hl-keyword">return</strong> IRQ_HANDLED;
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}
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...
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<strong class="hl-keyword">return</strong> IRQ_NONE;
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}</pre></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="#spi_key_procedures__section_kmx_twy_21c" data-tocid="spi_key_procedures__section_kmx_twy_21c">初始化流程</a></div></li><li class="section-item"><div class="section-title"><a href="#spi_key_procedures__section_ip3_5wy_21c" data-tocid="spi_key_procedures__section_ip3_5wy_21c">中断流程</a></div></li></ul></div>
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