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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/boot/reset-drivers.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">Reset</h1><div class="date inPage">4 Dec 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="d37935e22__20250121171516">本章节描述 ArtInChip 平台的 U-Boot 复位驱动相关内容。</p><section class="- topic/section section" id="reset__section_rwm_bch_bzb" data-ofbid="reset__section_rwm_bch_bzb"><h2 class="- topic/title title sectiontitle">驱动框架</h2>
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<p class="- topic/p p" data-ofbid="d37935e29__20250121171516">U-Boot 驱动模型支持 Reset，ArtInChip 平台中 Reset 驱动基于该框架进行实现。 相关配置为：</p>
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<ul class="- topic/ul ul" id="reset__ul_twm_bch_bzb" data-ofbid="reset__ul_twm_bch_bzb"><li class="- topic/li li" data-ofbid="d37935e33__20250121171516">
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<p class="- topic/p p" data-ofbid="d37935e35__20250121171516">CONFIG_DM_RESET</p>
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</li><li class="- topic/li li" data-ofbid="d37935e38__20250121171516">
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<p class="- topic/p p" data-ofbid="d37935e40__20250121171516">CONFIG_RESET_ARTINCHIP</p>
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</li></ul>
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<p class="- topic/p p" data-ofbid="d37935e44__20250121171516">相关源码有：</p>
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<ul class="- topic/ul ul" id="reset__ul_vwm_bch_bzb" data-ofbid="reset__ul_vwm_bch_bzb"><li class="- topic/li li" data-ofbid="d37935e48__20250121171516">
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<p class="- topic/p p" data-ofbid="d37935e50__20250121171516"><span class="+ topic/ph sw-d/filepath ph filepath">include/reset.h</span></p>
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</li><li class="- topic/li li" data-ofbid="d37935e54__20250121171516">
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<p class="- topic/p p" data-ofbid="d37935e56__20250121171516"><span class="+ topic/ph sw-d/filepath ph filepath">include/reset-uclass.h</span></p>
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</li><li class="- topic/li li" data-ofbid="d37935e60__20250121171516">
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<p class="- topic/p p" data-ofbid="d37935e62__20250121171516"><span class="+ topic/ph sw-d/filepath ph filepath">drivers/reset/reset-uclass.c</span></p>
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</li><li class="- topic/li li" data-ofbid="d37935e66__20250121171516">
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<p class="- topic/p p" data-ofbid="d37935e68__20250121171516"><span class="+ topic/ph sw-d/filepath ph filepath">drivers/reset/reset-artinchip.c</span></p>
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</li></ul>
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</section><section class="- topic/section section" id="reset__section_wwm_bch_bzb" data-ofbid="reset__section_wwm_bch_bzb"><h2 class="- topic/title title sectiontitle">驱动接口</h2>
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<div class="- topic/p p" data-ofbid="d37935e78__20250121171516">相关的复位驱动接口有：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="reset__codeblock_fky_vmr_c1c" data-ofbid="reset__codeblock_fky_vmr_c1c"><strong class="hl-keyword">int</strong> reset_get_by_index(<strong class="hl-keyword">struct</strong> udevice *dev, <strong class="hl-keyword">int</strong> index,
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<strong class="hl-keyword">struct</strong> reset_ctl *reset_ctl);
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<strong class="hl-keyword">int</strong> reset_get_by_name(<strong class="hl-keyword">struct</strong> udevice *dev, <strong class="hl-keyword">const</strong> <strong class="hl-keyword">char</strong> *name,
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<strong class="hl-keyword">struct</strong> reset_ctl *reset_ctl);
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<strong class="hl-keyword">int</strong> reset_get_by_index_nodev(ofnode node, <strong class="hl-keyword">int</strong> index,
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<strong class="hl-keyword">struct</strong> reset_ctl *reset_ctl);
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<strong class="hl-keyword">int</strong> reset_get_bulk(<strong class="hl-keyword">struct</strong> udevice *dev, <strong class="hl-keyword">struct</strong> reset_ctl_bulk *bulk);
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<strong class="hl-keyword">int</strong> reset_request(<strong class="hl-keyword">struct</strong> reset_ctl *reset_ctl);
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<strong class="hl-keyword">int</strong> reset_free(<strong class="hl-keyword">struct</strong> reset_ctl *reset_ctl);
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<strong class="hl-keyword">int</strong> reset_assert(<strong class="hl-keyword">struct</strong> reset_ctl *reset_ctl);
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<strong class="hl-keyword">int</strong> reset_deassert(<strong class="hl-keyword">struct</strong> reset_ctl *reset_ctl);</pre></div>
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</section><section class="- topic/section section" id="reset__section_ywm_bch_bzb" data-ofbid="reset__section_ywm_bch_bzb"><h2 class="- topic/title title sectiontitle">初始化和使用</h2>
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<div class="- topic/p p" data-ofbid="d37935e88__20250121171516">通常硬件设备初始化时，需要对其进行一次复位。Reset 驱动的 probe
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在复位控制器第一次被获取时触发。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="reset__codeblock_iyj_wmr_c1c" data-ofbid="reset__codeblock_iyj_wmr_c1c">reset_get_by_index(); <em class="hl-comment">// drivers/reset/reset-uclass.c</em>
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|-> reset_get_by_index_tail(ret, dev_ofnode(dev), &args, <span class="hl-string">"resets"</span>,
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| index > <span class="hl-number">0</span>, reset_ctl);
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|-> uclass_get_device_by_ofnode(UCLASS_RESET, args->node, &dev_reset);
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|-> uclass_find_device_by_ofnode(id, node, &dev);
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|-> uclass_get_device_tail(dev, ret, devp);
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|-> device_probe(dev); <em class="hl-comment">// drivers/core/device.c</em>
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|-> drv->probe(dev);
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artinchip_reset_probe(dev);
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<em class="hl-comment">// drivers/reset/reset-artinchip.c</em></pre></div>
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<p class="- topic/p p" data-ofbid="d37935e93__20250121171516">系统给每一个设备的复位控制器分配了一个 ID，并且在设备的 DTS 配置中将 ID 分配到具体的设备。 设备初始化时，通过 FDT 的配置获取相应的复位控制设备。</p>
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<p class="- topic/p p" data-ofbid="d37935e96__20250121171516">DTS 中复位控制器配置示例：</p>
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="reset__pre_axm_bch_bzb" data-ofbid="reset__pre_axm_bch_bzb">dma: dma-controller@<span class="hl-number">10000000</span> {
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compatible = <span class="hl-string">"artinchip,aic-dma"</span>;
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...
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resets = <&rst RESET_DMA>;
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...
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};
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</pre>
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<p class="- topic/p p" data-ofbid="d37935e103__20250121171516">相关 ID 定义可参考：</p>
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<ul class="- topic/ul ul" id="reset__ul_cxm_bch_bzb" data-ofbid="reset__ul_cxm_bch_bzb"><li class="- topic/li li" data-ofbid="d37935e107__20250121171516"><span class="+ topic/ph sw-d/filepath ph filepath">include/dt-bindings/reset/artinchip,aic-reset.h</span></li></ul>
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<div class="- topic/p p" data-ofbid="d37935e111__20250121171516">获取复位控制器的流程：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="reset__codeblock_whk_xmr_c1c" data-ofbid="reset__codeblock_whk_xmr_c1c">reset_get_by_index(dev, index, reset_ctl); <em class="hl-comment">// drivers/reset/reset-uclass.c</em>
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| <em class="hl-comment">// 此处 index 是 DTS 中配置给该设备的第几个复位控制设备</em>
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|
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|-> reset_get_by_index_tail();
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|-> uclass_get_device_by_ofnode(UCLASS_RESET, args->node, &dev_reset);
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|-> resetof_xlate_default(reset_ctl, args);
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|-> reset_ctl->id = args->args[<span class="hl-number">0</span>]; <em class="hl-comment">// 获取到具体的复位控制器 ID</em></pre></div>
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<div class="- topic/p p" data-ofbid="d37935e116__20250121171516">需要对设备进行复位时，通过 <span class="+ topic/keyword pr-d/apiname keyword apiname">reset_ctl->id</span>
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进行访问和设置硬件。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="reset__codeblock_xxp_xmr_c1c" data-ofbid="reset__codeblock_xxp_xmr_c1c">reset_assert(reset_ctl); <em class="hl-comment">// drivers/reset/reset-uclass.c</em>
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|-> ops->rst_assert(reset_ctl);
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artinchip_reset_assert(reset_ctrl); <em class="hl-comment">// drivers/reset/reset-artinchip.c</em></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="#reset__section_rwm_bch_bzb" data-tocid="reset__section_rwm_bch_bzb">驱动框架</a></div></li><li class="section-item"><div class="section-title"><a href="#reset__section_wwm_bch_bzb" data-tocid="reset__section_wwm_bch_bzb">驱动接口</a></div></li><li class="section-item"><div class="section-title"><a href="#reset__section_ywm_bch_bzb" data-tocid="reset__section_ywm_bch_bzb">初始化和使用</a></div></li></ul></div>
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