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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/usb/usb-device-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">4 Feb 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="usb_device_key_procedures__section_kyj_qmz_21c" data-ofbid="usb_device_key_procedures__section_kyj_qmz_21c"><h2 class="- topic/title title sectiontitle">初始化流程</h2>
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<p class="- topic/p p" data-ofbid="d169621e27__20250121171620">DCD 驱动的入口是 platform 驱动，初始化流程先获取 irq、reg、clk、reset 等资源并进行初始化，最后调用 usb_add_gadget_udc()
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向系统中注册。</p>
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<div class="- topic/p p" data-ofbid="d169621e30__20250121171620">大致的流程如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_device_key_procedures__codeblock_yvz_qmz_21c" data-ofbid="usb_device_key_procedures__codeblock_yvz_qmz_21c">|-->aic_udc_probe()
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|-->gg->regs = devm_ioremap_resource(&dev->dev, res);
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|-->gg->reset = devm_reset_control_get_optional(gg->dev, <span class="hl-string">"aicudc"</span>);
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|-->gg->reset_ecc = devm_reset_control_get_optional_shared(gg->dev,<span class="hl-string">"aicudc-ecc"</span>);
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|-->gg->clks[i] = of_clk_get(gg->dev->of_node, i);
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|-->aic_gadget_init(gg);
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|-->aic_low_hw_enable()
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|-->clk_prepare_enable(gg->clks[i]);
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|-->reset_control_deassert(gg->reset);
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|-->reset_control_deassert(gg->reset_ecc);
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|-->res = platform_get_resource(dev, IORESOURCE_IRQ, <span class="hl-number">0</span>);
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|-->gg->irq = res->start;
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|-->usb_add_gadget_udc(gg->dev, &gg->gadget);</pre></div>
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</section><section class="- topic/section section" id="usb_device_key_procedures__section_myj_qmz_21c" data-ofbid="usb_device_key_procedures__section_myj_qmz_21c"><h2 class="- topic/title title sectiontitle">ep 分配流程</h2>
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<div class="- topic/p p" data-ofbid="d169621e40__20250121171620"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_device_key_procedures__image_nyj_qmz_21c" src="../../../images/usb/usb_dcd_ep_pool.png" alt="image5"/></div><br/></div>
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<p class="- topic/p p" data-ofbid="d169621e45__20250121171620">如上图所示，ep 资源的操作分为两部分：</p>
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<ul class="- topic/ul ul" id="usb_device_key_procedures__ul_oyj_qmz_21c" data-ofbid="usb_device_key_procedures__ul_oyj_qmz_21c"><li class="- topic/li li" data-ofbid="d169621e49__20250121171620">
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<p class="- topic/p p" data-ofbid="d169621e51__20250121171620">ep 资源池初始化。在 udc 驱动初始化的时候同时初始化了 ep 资源池，这样就决定了当前有多少个 ep 资源可用。</p>
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</li><li class="- topic/li li" data-ofbid="d169621e54__20250121171620">
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<p class="- topic/p p" data-ofbid="d169621e56__20250121171620">ep 资源的分配。gadget composite device 可以配置多个 interface 即 gadget function driver，当
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function driver 启用时，会从资源池中分配需要的 ep。如果配置的 function driver 过多，就可能会分配失败。</p>
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</li></ul>
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</section><section class="- topic/section section" id="usb_device_key_procedures__section_pyj_qmz_21c" data-ofbid="usb_device_key_procedures__section_pyj_qmz_21c"><h2 class="- topic/title title sectiontitle">普通 ep 的 request 处理</h2>
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<div class="- topic/p p" data-ofbid="d169621e65__20250121171620"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_device_key_procedures__image_qyj_qmz_21c" src="../../../images/usb/usb_dcd_ep_queue.png" alt="image6"/></div><br/></div>
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<p class="- topic/p p" data-ofbid="d169621e70__20250121171620">如上图所示，对于普通 ep 的 reuqest 数据收发分为两步：</p>
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<ul class="- topic/ul ul" id="usb_device_key_procedures__ul_ryj_qmz_21c" data-ofbid="usb_device_key_procedures__ul_ryj_qmz_21c"><li class="- topic/li li" data-ofbid="d169621e74__20250121171620">
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<p class="- topic/p p" data-ofbid="d169621e76__20250121171620">request enqueue。首先调用 udc 的 <code class="+ topic/ph pr-d/codeph ph codeph">.queue()</code> 函数，将需要传输的数据插入到硬件控制器对应的
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ep 寄存器当中。</p>
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</li><li class="- topic/li li" data-ofbid="d169621e82__20250121171620">
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<p class="- topic/p p" data-ofbid="d169621e84__20250121171620">complete callback。ep 数据收发完成会产生 <code class="+ topic/ph pr-d/codeph ph codeph">transfer complete</code>
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中断，在中断服务程序中调用 <code class="+ topic/ph pr-d/codeph ph codeph">complete</code> 回调函数，结束整个 request 传输。</p>
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</li></ul>
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</section><section class="- topic/section section" id="usb_device_key_procedures__section_syj_qmz_21c" data-ofbid="usb_device_key_procedures__section_syj_qmz_21c"><h2 class="- topic/title title sectiontitle">ep0 的 request 处理</h2>
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<div class="- topic/p p" data-ofbid="d169621e99__20250121171620"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_device_key_procedures__image_tyj_qmz_21c" src="../../../images/usb/usb_dcd_ep0_queue.png" alt="image7"/></div><br/></div>
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<p class="- topic/p p" data-ofbid="d169621e104__20250121171620">如上图所示，对于 ep0 的 reuqest 数据收发和 普通 ep 基本一样，只是对数据的回调处理稍有不同。</p>
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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="#usb_device_key_procedures__section_kyj_qmz_21c" data-tocid="usb_device_key_procedures__section_kyj_qmz_21c">初始化流程</a></div></li><li class="section-item"><div class="section-title"><a href="#usb_device_key_procedures__section_myj_qmz_21c" data-tocid="usb_device_key_procedures__section_myj_qmz_21c">ep 分配流程</a></div></li><li class="section-item"><div class="section-title"><a href="#usb_device_key_procedures__section_pyj_qmz_21c" data-tocid="usb_device_key_procedures__section_pyj_qmz_21c">普通 ep 的 request 处理</a></div></li><li class="section-item"><div class="section-title"><a href="#usb_device_key_procedures__section_syj_qmz_21c" data-tocid="usb_device_key_procedures__section_syj_qmz_21c">ep0 的 request 处理</a></div></li></ul></div>
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