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aria-labelledby="button-expand-action chapter-system-d4445e3198-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/chapter-title/chapter-system.html" id="chapter-system-d4445e3198-link">系统</a><div class="wh-tooltip"><p class="shortdesc"></p></div></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="chapter-memory-d4445e4054" class="topicref" data-id="chapter-memory" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action chapter-memory-d4445e4054-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/chapter-title/chapter-memory-sdk.html" id="chapter-memory-d4445e4054-link">存储</a><div class="wh-tooltip"><p class="shortdesc">SDMC、SPI NAND、SPI NOR 等存储模块的介绍和使用说明。</p></div></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="concept_mcc_32s_nbc-d4445e4438" class="topicref" data-id="concept_mcc_32s_nbc" data-state="not-ready"><span role="button" 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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">
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<span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" title="Edit this document" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/boot/spi-divers.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">SPI</h1>
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<div class="date inPage">15 Jan 2024</div><div style="color: gray;">
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Read time: 2 minute(s)
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</div>
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<div class="- topic/body concept/conbody body conbody">
|
||
<p class="- topic/p p" data-ofbid="d139161e33__20250123155213">SPI 在 U-Boot 中主要用于支持 SPI NAND/NOR 存储设备。目前 ArtInChip 平台上 SPI 的实现只支持半双工模式(Half-duplex)。</p>
|
||
<section class="- topic/section section" id="spi_divers__section_dzf_vnr_c1c" data-ofbid="spi_divers__section_dzf_vnr_c1c"><h2 class="- topic/title title sectiontitle">驱动框架</h2>
|
||
|
||
<p class="- topic/p p" data-ofbid="d139161e41__20250123155213">U-Boot 驱动模型支持 SPI，ArtInChip 平台中 SPI 驱动基于该框架进行实现。 相关配置为：</p>
|
||
<ul class="- topic/ul ul" id="spi_divers__ul_fzf_vnr_c1c" data-ofbid="spi_divers__ul_fzf_vnr_c1c">
|
||
<li class="- topic/li li" data-ofbid="d139161e46__20250123155213">
|
||
<p class="- topic/p p" data-ofbid="d139161e48__20250123155213">CONFIG_DM_SPI</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d139161e52__20250123155213">
|
||
<p class="- topic/p p" data-ofbid="d139161e54__20250123155213">CONFIG_SPI</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d139161e58__20250123155213">
|
||
<p class="- topic/p p" data-ofbid="d139161e60__20250123155213">CONFIG_SPL_SPI_SUPPORT</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d139161e64__20250123155213">
|
||
<p class="- topic/p p" data-ofbid="d139161e66__20250123155213">CONFIG_ARTINCHIP_SPI</p>
|
||
</li>
|
||
</ul>
|
||
<p class="- topic/p p" data-ofbid="d139161e71__20250123155213">相关源码有：</p>
|
||
<ul class="- topic/ul ul" id="spi_divers__ul_hzf_vnr_c1c" data-ofbid="spi_divers__ul_hzf_vnr_c1c">
|
||
<li class="- topic/li li" data-ofbid="d139161e76__20250123155213">
|
||
<p class="- topic/p p" data-ofbid="d139161e78__20250123155213"><span class="+ topic/ph sw-d/filepath ph filepath">drivers/spi/spi-uclass.c</span></p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d139161e83__20250123155213">
|
||
<p class="- topic/p p" data-ofbid="d139161e85__20250123155213"><span class="+ topic/ph sw-d/filepath ph filepath">include/spi.h</span></p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d139161e90__20250123155213">
|
||
<p class="- topic/p p" data-ofbid="d139161e92__20250123155213"><span class="+ topic/ph sw-d/filepath ph filepath">drivers/spi/artinchip_spi.c</span></p>
|
||
</li>
|
||
</ul>
|
||
</section>
|
||
<section class="- topic/section section" id="spi_divers__section_izf_vnr_c1c" data-ofbid="spi_divers__section_izf_vnr_c1c"><h2 class="- topic/title title sectiontitle">驱动接口</h2>
|
||
|
||
<div class="- topic/p p" data-ofbid="d139161e104__20250123155213">常用接口：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="spi_divers__codeblock_rrw_wnr_c1c" data-ofbid="spi_divers__codeblock_rrw_wnr_c1c"><code><strong class="hl-keyword">int</strong> dm_spi_claim_bus(<strong class="hl-keyword">struct</strong> udevice *dev);
|
||
<strong class="hl-keyword">void</strong> dm_spi_release_bus(<strong class="hl-keyword">struct</strong> udevice *dev);
|
||
<strong class="hl-keyword">int</strong> dm_spi_xfer(<strong class="hl-keyword">struct</strong> udevice *dev, <strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">int</strong> bitlen,
|
||
<strong class="hl-keyword">const</strong> <strong class="hl-keyword">void</strong> *dout, <strong class="hl-keyword">void</strong> *din, <strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">long</strong> flags);
|
||
<strong class="hl-keyword">int</strong> spi_claim_bus(<strong class="hl-keyword">struct</strong> spi_slave *slave);
|
||
<strong class="hl-keyword">void</strong> spi_release_bus(<strong class="hl-keyword">struct</strong> spi_slave *slave);
|
||
<strong class="hl-keyword">int</strong> spi_xfer(<strong class="hl-keyword">struct</strong> spi_slave *slave, <strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">int</strong> bitlen, <strong class="hl-keyword">const</strong> <strong class="hl-keyword">void</strong> *dout,
|
||
<strong class="hl-keyword">void</strong> *din, <strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">long</strong> flags);</code></pre></div>
|
||
</section>
|
||
<section class="- topic/section section" id="spi_divers__section_kzf_vnr_c1c" data-ofbid="spi_divers__section_kzf_vnr_c1c"><h2 class="- topic/title title sectiontitle">初始化流程</h2>
|
||
|
||
<div class="- topic/p p" data-ofbid="d139161e115__20250123155213">SPI 设备挂载在 SPI 总线上，当 SPI 设备初始化时，如果父设备还没有被初始化， 则会自动触发父设备的初始化。下面是 SPI NAND 初始化时触发 SPI
|
||
初始化的流程。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="spi_divers__codeblock_lnm_xnr_c1c" data-ofbid="spi_divers__codeblock_lnm_xnr_c1c"><code>mtd_probe(dev)
|
||
|-> device_probe(dev)
|
||
| <em class="hl-comment">// 此时 SPI 还没有 probe，则先 probe SPI</em>
|
||
|-> device_probe(dev->parent); <em class="hl-comment">// drivers/core/device.c</em>
|
||
| |-> drv->probe(dev);
|
||
| aic_spi_probe(dev); <em class="hl-comment">// drivers/spi/artinchip_spi.c</em>
|
||
|
|
||
|-> drv->probe(dev);
|
||
spinand_probe(dev) <em class="hl-comment">// drivers/mtd/nand/spi/core.c</em></code></pre></div>
|
||
</section>
|
||
<section class="- topic/section section" id="spi_divers__section_mzf_vnr_c1c" data-ofbid="spi_divers__section_mzf_vnr_c1c"><h2 class="- topic/title title sectiontitle">DMA 的支持</h2>
|
||
|
||
<p class="- topic/p p" data-ofbid="d139161e126__20250123155213">ArtInChip SPI 驱动支持使用 DMA 收发数据和使用 FIFO 通过 CPU 读写的方式收发数据， 在 DMA 使能的情况下，对于数据长度大于等于
|
||
<span class="+ topic/keyword pr-d/parmname keyword parmname">SPI_FIFO_DEPTH</span> 的传输，驱动自动切换使用 DMA 进行传输，否则默认使用 FIFO 模式。</p>
|
||
<p class="- topic/p p" data-ofbid="d139161e132__20250123155213">如果系统没有使能 DMA，则所有传输都使用 FIFO 模式。</p>
|
||
<p class="- topic/p p" data-ofbid="d139161e135__20250123155213">使能 DMA 的 Kconfig 配置为：</p>
|
||
<ul class="- topic/ul ul" id="spi_divers__ul_ozf_vnr_c1c" data-ofbid="spi_divers__ul_ozf_vnr_c1c">
|
||
<li class="- topic/li li" data-ofbid="d139161e140__20250123155213">
|
||
<p class="- topic/p p" data-ofbid="d139161e142__20250123155213">CONFIG_ARTINCHIP_DMA</p>
|
||
</li>
|
||
</ul>
|
||
</section>
|
||
<section class="- topic/section section" id="spi_divers__section_pzf_vnr_c1c" data-ofbid="spi_divers__section_pzf_vnr_c1c"><h2 class="- topic/title title sectiontitle">QUAD SPI 的支持</h2>
|
||
|
||
<p class="- topic/p p" data-ofbid="d139161e154__20250123155213">对于非存储 SPI 设备，SPI 驱动只支持标准 SPI 模式，即 Single Mode，数据传输都使用一根线进行(MOSI 和 MISO)。 对于 SPI
|
||
存储设备(SPI NAND/SPI NOR)，通过对接 <code class="+ topic/ph pr-d/codeph ph codeph">spi-mem</code> 框架，可以支持 DUAL SPI 和 QUAD
|
||
SPI。</p>
|
||
<div class="- topic/p p" data-ofbid="d139161e160__20250123155213">相关代码：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="spi_divers__codeblock_tmj_ynr_c1c" data-ofbid="spi_divers__codeblock_tmj_ynr_c1c"><code><strong class="hl-keyword">static</strong> <strong class="hl-keyword">const</strong> <strong class="hl-keyword">struct</strong> spi_controller_mem_ops aic_spi_mem_ops = {
|
||
.supports_op = aic_spi_mem_supports_op,
|
||
.exec_op = aic_spi_mem_exec_op,
|
||
};
|
||
<strong class="hl-keyword">static</strong> <strong class="hl-keyword">const</strong> <strong class="hl-keyword">struct</strong> dm_spi_ops aic_spi_ops = {
|
||
.claim_bus = aic_spi_claim_bus,
|
||
.release_bus = aic_spi_release_bus,
|
||
.xfer = aic_spi_xfer,
|
||
.set_speed = aic_spi_set_speed,
|
||
.set_mode = aic_spi_set_mode,
|
||
.mem_ops = &aic_spi_mem_ops,
|
||
};</code></pre></div>
|
||
<p class="- topic/p p" data-ofbid="d139161e165__20250123155213">通过设置 <span class="+ topic/keyword pr-d/apiname keyword apiname">.exec_op</span> ，SPI MEM 设备的所有操作都由
|
||
<span class="+ topic/keyword pr-d/apiname keyword apiname">aic_spi_mem_exec_op</span> 进行处理。 由于该接口可以获取到 SPI
|
||
操作的数据位宽等详细信息，驱动可以为每一个传输操作设置准确的模式(Single/Dual/Quad)。</p>
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</section>
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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_divers__section_dzf_vnr_c1c" data-tocid="spi_divers__section_dzf_vnr_c1c">驱动框架</a></div></li><li class="section-item"><div class="section-title"><a href="#spi_divers__section_izf_vnr_c1c" data-tocid="spi_divers__section_izf_vnr_c1c">驱动接口</a></div></li><li class="section-item"><div class="section-title"><a href="#spi_divers__section_kzf_vnr_c1c" data-tocid="spi_divers__section_kzf_vnr_c1c">初始化流程</a></div></li><li class="section-item"><div class="section-title"><a href="#spi_divers__section_mzf_vnr_c1c" data-tocid="spi_divers__section_mzf_vnr_c1c">DMA 的支持</a></div></li><li class="section-item"><div class="section-title"><a href="#spi_divers__section_pzf_vnr_c1c" data-tocid="spi_divers__section_pzf_vnr_c1c">QUAD SPI 的支持</a></div></li></ul></div>
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