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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-controller-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">6 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="usb_controller_key_procedures__section_qxm_1mz_21c" data-ofbid="usb_controller_key_procedures__section_qxm_1mz_21c"><h2 class="- topic/title title sectiontitle">初始化流程</h2>
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<p class="- topic/p p" data-ofbid="d142202e27__20250121171609">HCD 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_hcd()
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向系统中注册。</p>
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<div class="- topic/p p" data-ofbid="d142202e30__20250121171609">大致的流程如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_controller_key_procedures__codeblock_xzw_bmz_21c" data-ofbid="usb_controller_key_procedures__codeblock_xzw_bmz_21c">|-->ehci_platform_init()
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|-->ehci_init_driver()
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|-->platform_driver_register()
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|-->aic_ehci_platform_probe()
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|-->hcd = usb_create_hcd()
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|-->irq = platform_get_irq(dev, <span class="hl-number">0</span>);
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|-->priv->clks[i] = of_clk_get(dev->dev.of_node, i);
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|-->priv->rst[i] = devm_reset_control_get_shared_by_index(&dev->dev, i);
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|-->hcd->regs = devm_ioremap_resource(&dev->dev, res_mem);
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|-->aic_ehci_platform_power_on()
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|-->reset_control_deassert(priv->rst[i]);
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|-->clk_prepare_enable(priv->clks[i]);
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|-->usb_add_hcd(hcd, irq, IRQF_SHARED);</pre></div>
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</section><section class="- topic/section section" id="usb_controller_key_procedures__section_sxm_1mz_21c" data-ofbid="usb_controller_key_procedures__section_sxm_1mz_21c"><h2 class="- topic/title title sectiontitle">普通 URB 处理流程</h2>
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<div class="- topic/p p" data-ofbid="d142202e40__20250121171609"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_controller_key_procedures__image_txm_1mz_21c" src="../../../images/usb/usb_urb_flow.png" width="576" alt="image2"/></div><br/></div>
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<p class="- topic/p p" data-ofbid="d142202e45__20250121171609">如上图所示，一个普通 urb 的处理分为两步：</p>
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<ul class="- topic/ul ul" id="usb_controller_key_procedures__ul_uxm_1mz_21c" data-ofbid="usb_controller_key_procedures__ul_uxm_1mz_21c"><li class="- topic/li li" data-ofbid="d142202e49__20250121171609">
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<p class="- topic/p p" data-ofbid="d142202e51__20250121171609">urb enqueue。首先调用 hcd 的 <code class="+ topic/ph pr-d/codeph ph codeph">.urb_enqueue()</code>
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函数，将需要传输的数据插入到硬件控制器的链表当中。</p>
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</li><li class="- topic/li li" data-ofbid="d142202e57__20250121171609">
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<p class="- topic/p p" data-ofbid="d142202e59__20250121171609">urb complete。在链表中的一帧数据传输完成后硬件会产生 <code class="+ topic/ph pr-d/codeph ph codeph">complete</code> 中断，在中断服务程序中对相应 urb
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发送 <code class="+ topic/ph pr-d/codeph ph codeph">complete</code> 信号，让 <code class="+ topic/ph pr-d/codeph ph codeph">usb_start_wait_urb()</code>
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的流程继续执行。</p>
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</li></ul>
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</section><section class="- topic/section section" id="usb_controller_key_procedures__section_vxm_1mz_21c" data-ofbid="usb_controller_key_procedures__section_vxm_1mz_21c"><h2 class="- topic/title title sectiontitle">Roothub URB 处理流程</h2>
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<div class="- topic/p p" data-ofbid="d142202e77__20250121171609"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_controller_key_procedures__image_wxm_1mz_21c" src="../../../images/usb/usb_roothub_urb_flow.png" width="576" alt="image3"/></div><br/></div>
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<p class="- topic/p p" data-ofbid="d142202e82__20250121171609">如上图所示，roothub urb 的处理分为两种类型：</p>
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<ul class="- topic/ul ul" id="usb_controller_key_procedures__ul_xxm_1mz_21c" data-ofbid="usb_controller_key_procedures__ul_xxm_1mz_21c"><li class="- topic/li li" data-ofbid="d142202e86__20250121171609">
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<p class="- topic/p p" data-ofbid="d142202e88__20250121171609">ep0 control urb。对于 roothub control urb，HCD 需要使用软件来模拟，实际上 urb
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没有发送到硬件控制器中，因为是软件模拟所以无需等待 <code class="+ topic/ph pr-d/codeph ph codeph">complete</code> 可以立即释放。</p>
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</li><li class="- topic/li li" data-ofbid="d142202e94__20250121171609">
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<p class="- topic/p p" data-ofbid="d142202e96__20250121171609">获取端口状态 urb。这类 urb 会阻塞等待端口状态改变，一旦端口状态改变会触发硬件中断，在中断处理中唤醒对应 urb 的
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<code class="+ topic/ph pr-d/codeph ph codeph">complete</code> 信号，让 <code class="+ topic/ph pr-d/codeph ph codeph">usb_start_wait_urb()</code>
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的流程继续执行。</p>
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</li></ul>
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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="#usb_controller_key_procedures__section_qxm_1mz_21c" data-tocid="usb_controller_key_procedures__section_qxm_1mz_21c">初始化流程</a></div></li><li class="section-item"><div class="section-title"><a href="#usb_controller_key_procedures__section_sxm_1mz_21c" data-tocid="usb_controller_key_procedures__section_sxm_1mz_21c">普通 URB 处理流程</a></div></li><li class="section-item"><div class="section-title"><a href="#usb_controller_key_procedures__section_vxm_1mz_21c" data-tocid="usb_controller_key_procedures__section_vxm_1mz_21c">Roothub URB 处理流程</a></div></li></ul></div>
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