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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/watchdog/watchdog-design.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">设计说明</h1><div class="date inPage">13 Dec 2024</div><div style="color: gray;">
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Read time: 1 minute(s)
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<p class="- topic/p p" data-ofbid="d346161e24__20250121172119">源代码位于 <span class="+ topic/ph sw-d/filepath ph filepath">drivers/watchdog/artinchip_wdt.c</span></p>
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<p class="- topic/p p" data-ofbid="d346161e29__20250121172119">Linux 提供了一个 Watchdog 子系统（简称 Watchdog Core），使得在用户空间可以通过
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<span class="+ topic/ph sw-d/filepath ph filepath">/dev/watchdogX</span> 来访问 Watchdog 控制器。为了更方便查看硬件状态和参数设置，本驱动另外扩展了几个
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sysfs 节点。</p>
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<p class="- topic/p p" data-ofbid="d346161e35__20250121172119">整个软件框架可以简单抽象为下图：</p>
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<figure class="- topic/fig fig fignone" id="watchdog_design_intro__fig_rdr_x2t_c1c" data-ofbid="watchdog_design_intro__fig_rdr_x2t_c1c"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="watchdog_design_intro__image_b4g_t2t_c1c" src="../../../images/watchdog/sw_system23.png" alt="sw_system23"/></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">Linux Watchdog 子系统架构图</span></figcaption></figure>
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<p class="- topic/p p" data-ofbid="d346161e45__20250121172119">针对我们 Watchdog 控制器的几个特色功能：</p>
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<ol class="- topic/ol ol" id="watchdog_design_intro__ol_c4g_t2t_c1c" data-ofbid="watchdog_design_intro__ol_c4g_t2t_c1c"><li class="- topic/li li" data-ofbid="d346161e50__20250121172119">多通道<p class="- topic/p p" data-ofbid="d346161e52__20250121172119">将每个通道注册为一个 watchdog 设备，在/dev/目录下面生成多个 watchdog 设备节点。每一个 Watchdog
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设备节点都提供标准的 Watchdog ioctl 接口。</p></li><li class="- topic/li li" data-ofbid="d346161e54__20250121172119">超时中断<p class="- topic/p p" data-ofbid="d346161e56__20250121172119">在 Watchdog 超时之前可以产生一些中断信号，让软件有机会做一些预处理。对应到 Core 的 pretimeout 参数，可以支持对外注册
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pretimeout 回调的机制。</p></li><li class="- topic/li li" data-ofbid="d346161e58__20250121172119">清零窗口<p class="- topic/p p" data-ofbid="d346161e60__20250121172119">Watchdog Core 中没有对应的参数，所以提供一个 int 类型的 DTS
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字段“clr_thd”，让用户态可以设置此门限，需要注意这个值是 4 个 Watchdog 通道共用的。默认是 0，表示随时可以 clean 计数。详见
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<a class="- topic/xref xref" href="watchdog-config.html#watchdog_configuration__table_h13_2dt_c1c">Watchdog 自定义参数</a>。</p></li><li class="- topic/li li" data-ofbid="d346161e66__20250121172119">调试模式的计数状态<p class="- topic/p p" data-ofbid="d346161e68__20250121172119">当 CPU 进入 Jtag 的 debug 状态时，Watchdog 计数可以选择是否暂停。类似的，也通过一个 bool 类型的 DTS
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字段 “dbg_continue” 提供给用户态去设置。默认是暂停。详见 <a class="- topic/xref xref" href="watchdog-config.html#watchdog_configuration__table_h13_2dt_c1c">Watchdog 自定义参数</a>。</p></li></ol>
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