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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/dma/dma-drivers.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">DMA</h1><div class="date inPage">4 Dec 2024</div><div style="color: gray;">
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Read time: 4 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><p class="- topic/p p" data-ofbid="d142889e22__20250121171609">此处描述的 DMA 是 ArtInChip 平台上的系统 DMA。一些硬件 IP 内部自带的 DMA 不在这里描述的范围。</p><section class="- topic/section section" id="dma_drivers__section_og5_mnr_c1c" data-ofbid="dma_drivers__section_og5_mnr_c1c"><h2 class="- topic/title title sectiontitle">驱动框架</h2>
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<p class="- topic/p p" data-ofbid="d142889e29__20250121171609">U-Boot 驱动模型支持 DMA，ArtInChip 平台中 DMA 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="dma_drivers__ul_qg5_mnr_c1c" data-ofbid="dma_drivers__ul_qg5_mnr_c1c"><li class="- topic/li li" data-ofbid="d142889e33__20250121171609">
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<p class="- topic/p p" data-ofbid="d142889e35__20250121171609">CONFIG_DMA</p>
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</li><li class="- topic/li li" data-ofbid="d142889e38__20250121171609">
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<p class="- topic/p p" data-ofbid="d142889e40__20250121171609">CONFIG_ARTINCHIP_DMA</p>
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</li></ul>
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<p class="- topic/p p" data-ofbid="d142889e44__20250121171609">相关源码有：</p>
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<ul class="- topic/ul ul" id="dma_drivers__ul_sg5_mnr_c1c" data-ofbid="dma_drivers__ul_sg5_mnr_c1c"><li class="- topic/li li" data-ofbid="d142889e48__20250121171609">
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<p class="- topic/p p" data-ofbid="d142889e50__20250121171609"><span class="+ topic/ph sw-d/filepath ph filepath">include/dma.h</span></p>
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</li><li class="- topic/li li" data-ofbid="d142889e54__20250121171609">
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<p class="- topic/p p" data-ofbid="d142889e56__20250121171609"><span class="+ topic/ph sw-d/filepath ph filepath">drivers/dma/dma-uclass.c</span></p>
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</li><li class="- topic/li li" data-ofbid="d142889e60__20250121171609">
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<p class="- topic/p p" data-ofbid="d142889e62__20250121171609"><span class="+ topic/ph sw-d/filepath ph filepath">drivers/dma/artinchip_dma.c</span></p>
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</li></ul>
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</section><section class="- topic/section section" id="dma_drivers__section_tg5_mnr_c1c" data-ofbid="dma_drivers__section_tg5_mnr_c1c"><h2 class="- topic/title title sectiontitle">驱动接口</h2>
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<div class="- topic/p p" data-ofbid="d142889e72__20250121171609">常用接口<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dma_drivers__codeblock_f3l_rnr_c1c" data-ofbid="dma_drivers__codeblock_f3l_rnr_c1c"><strong class="hl-keyword">int</strong> dma_enable(<strong class="hl-keyword">struct</strong> dma *dma);
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<strong class="hl-keyword">int</strong> dma_disable(<strong class="hl-keyword">struct</strong> dma *dma);
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<strong class="hl-keyword">int</strong> dma_request(<strong class="hl-keyword">struct</strong> udevice *dev, <strong class="hl-keyword">struct</strong> dma *dma);
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<strong class="hl-keyword">int</strong> dma_free(<strong class="hl-keyword">struct</strong> dma *dma);
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<strong class="hl-keyword">int</strong> dma_memcpy(<strong class="hl-keyword">void</strong> *dst, <strong class="hl-keyword">void</strong> *src, size_t len);
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<strong class="hl-keyword">int</strong> dma_prepare_rcv_buf(<strong class="hl-keyword">struct</strong> dma *dma, <strong class="hl-keyword">void</strong> *dst, size_t size);
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<strong class="hl-keyword">int</strong> dma_receive(<strong class="hl-keyword">struct</strong> dma *dma, <strong class="hl-keyword">void</strong> **dst, <strong class="hl-keyword">void</strong> *metadata);
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<strong class="hl-keyword">int</strong> dma_send(<strong class="hl-keyword">struct</strong> dma *dma, <strong class="hl-keyword">void</strong> *src, size_t len, <strong class="hl-keyword">void</strong> *metadata);</pre></div>
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</section><section class="- topic/section section" id="dma_drivers__section_vg5_mnr_c1c" data-ofbid="dma_drivers__section_vg5_mnr_c1c"><h2 class="- topic/title title sectiontitle">实现说明</h2>
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<p class="- topic/p p" data-ofbid="d142889e82__20250121171609">ArtInChip 平台上有一个系统 DMA，其支持 8 个通道同时工作。如规格书所定义，DMA 可以在不同的硬件 IP 之间搬运数据，系统为各硬件 IP
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分配了固定的数据端口号。 使用 DMA 时，软件需要先申请到一个空闲的 DMA 通道，并将源数据端口和目标数据端口等信息配置给 DMA 通道，然后启动 DMA
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进行工作。</p>
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<p class="- topic/p p" data-ofbid="d142889e85__20250121171609">然而上述的描述和使用方式并不能直接对应到 DTS 的配置方式以及 U-Boot 中的 DMA 表示方式， 中间需要做一些转换和说明。</p>
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<p class="- topic/p p" data-ofbid="d142889e88__20250121171609">在 DTS 中，可以描述某个控制器是否支持 DMA，并且配置所使用的 DMA ID 号。 在 ArtInChip 平台中，实际只有一个 DMA，各硬件 IP
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共享使用。在配置 DTS 时， 使用设备对应的 DMA 数据端口号作为 DMA ID，在运行时再给该 ID 分配可用的 DMA 通道。</p>
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<div class="- topic/p p" data-ofbid="d142889e91__20250121171609">如下面的示例：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dma_drivers__codeblock_mfj_qnr_c1c" data-ofbid="dma_drivers__codeblock_mfj_qnr_c1c">spi0: spi@<span class="hl-number">10400000</span> {
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compatible = <span class="hl-string">"artinchip,aic-spi-v1.0"</span>;
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reg = <<span class="hl-number">0x0</span> <span class="hl-number">0x10400000</span> <span class="hl-number">0x0</span> <span class="hl-number">0x1000</span>>;
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interrupts-extended = <&plic0 <span class="hl-number">44</span> IRQ_TYPE_LEVEL_HIGH>;
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clocks = <&cmu CLK_SPI0>;
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resets = <&rst RESET_SPI0>;
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dmas = <&dma DMA_SPI0>, <&dma DMA_SPI0>;
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dma-names = <span class="hl-string">"rx"</span>, <span class="hl-string">"tx"</span>;
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#address-cells = <<span class="hl-number">1</span>>;
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#size-cells = <<span class="hl-number">0</span>>;
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spi-max-frequency = <<span class="hl-number">24000000</span>>;
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};</pre></div>
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<p class="- topic/p p" data-ofbid="d142889e97__20250121171609">这里的 DMA 配置中，描述了 SPI0 控制器使用两个 DMA，分别是 “rx”, “tx”，它们的 DMA ID 都是 SPI0 对应的 DMA 数据端口号
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10。</p>
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<div class="- topic/p p" data-ofbid="d142889e100__20250121171609">上述的配置对应到 U-Boot 的 DMA 驱动实现时，会有一些问题。U-Boot DMA
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在运行时使用下面的结构体表示：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dma_drivers__codeblock_zxv_pnr_c1c" data-ofbid="dma_drivers__codeblock_zxv_pnr_c1c"><strong class="hl-keyword">struct</strong> dma {
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<strong class="hl-keyword">struct</strong> udevice *dev;
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<strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">long</strong> id;
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};</pre></div>
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<p class="- topic/p p" data-ofbid="d142889e105__20250121171609">DMA 的实例化在 DMA 驱动框架 <span class="+ topic/ph sw-d/filepath ph filepath">dma-uclass.c</span> 中进行，其中的 <span class="+ topic/keyword pr-d/parmname keyword parmname">id</span> 值即为 DTS
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中配置的 DMA ID。这里两个 DMA 使用了相同的 ID 号，如果直接使用，无法区分不同 DMA 所映射的 DMA 通道。</p>
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<p class="- topic/p p" data-ofbid="d142889e114__20250121171609">ArtInChip 平台上通过对 DMA 结构体中的 <span class="+ topic/keyword pr-d/parmname keyword parmname">id</span> 进行了扩展，以方便区分实际使用的不同 DMA， 如下所示：</p>
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<ul class="- topic/ul ul" id="dma_drivers__ul_zg5_mnr_c1c" data-ofbid="dma_drivers__ul_zg5_mnr_c1c"><li class="- topic/li li" data-ofbid="d142889e121__20250121171609">
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<p class="- topic/p p" data-ofbid="d142889e123__20250121171609">bit[15:0] 表示 IP 端口号</p>
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</li><li class="- topic/li li" data-ofbid="d142889e126__20250121171609">
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<p class="- topic/p p" data-ofbid="d142889e128__20250121171609">bit[31:16] 表示 DMA 通道号</p>
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</li></ul>
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<div class="- topic/p p" data-ofbid="d142889e132__20250121171609">在 DMA 创建时赋值端口号区域，DMA request 时赋值通道号区域。由于上述两个动作是在一个调用中完成的，
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因此不会有问题：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dma_drivers__codeblock_e3z_4nr_c1c" data-ofbid="dma_drivers__codeblock_e3z_4nr_c1c">dma_get_by_name(bus, <span class="hl-string">"tx"</span>, &priv->tx_dma); <em class="hl-comment">// drivers/dma/dma-uclass.c</em>
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|-> dma_get_by_index(dev, index, dma); <em class="hl-comment">// drivers/dma/dma-uclass.c</em>
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|-> dma_of_xlate_default(dma, &args);
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| |-> dma->id = args->args[<span class="hl-number">0</span>];
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|
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|-> dma_request(dev_dma, dma); <em class="hl-comment">// drivers/dma/dma-uclass.c</em>
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|-> aic_dma_request(dma); <em class="hl-comment">// drivers/dma/artinchip_dma.c</em>
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|-> phy_ch = aic_dma_phy_request(ud);
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|-> dma->id |= (phy_ch << AIC_DMA_PHY_CH_OFF);</pre></div>
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<p class="- topic/p p" data-ofbid="d142889e138__20250121171609">U-Boot 对 <span class="+ topic/keyword pr-d/parmname keyword parmname">struct dma</span> 结构体中 <span class="+ topic/keyword pr-d/parmname keyword parmname">id</span> 的定义是唯一标识，只要能够做 DMA
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区分即可， 因此上述扩展不会造成其他问题。</p>
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</section><section class="- topic/section section" id="dma_drivers__section_bh5_mnr_c1c" data-ofbid="dma_drivers__section_bh5_mnr_c1c"><h2 class="- topic/title title sectiontitle">初始化流程</h2>
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||
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<p class="- topic/p p" data-ofbid="d142889e152__20250121171609">DMA 驱动的初始化，在 DMA 第一次被使用时触发进行。</p>
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<div class="- topic/p p" data-ofbid="d142889e155__20250121171609"><strong class="+ topic/ph hi-d/b ph b">情况 1：</strong> DRAM DMA
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数据传输<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dma_drivers__codeblock_vdq_nnr_c1c" data-ofbid="dma_drivers__codeblock_vdq_nnr_c1c">dma_memcpy(dst_buf, src_buf, len);<em class="hl-comment">// drivers/dma/dma-uclass.c</em>
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|-> dma_get_device(DMA_SUPPORTS_MEM_TO_MEM, &dev);
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|-> uclass_first_device(UCLASS_DMA, &dev)
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|-> uclass_find_first_device(id, index, &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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aic_dma_probe(dev); <em class="hl-comment">// drivers/dma/artinchip_dma.c</em></pre></div>
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<div class="- topic/p p" data-ofbid="d142889e162__20250121171609"><strong class="+ topic/ph hi-d/b ph b">情况 2：</strong> 根据 DTS 配置申请
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DMA<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="dma_drivers__codeblock_gbg_4nr_c1c" data-ofbid="dma_drivers__codeblock_gbg_4nr_c1c">dma_get_by_name(bus, <span class="hl-string">"tx"</span>, &priv->tx_dma); <em class="hl-comment">// drivers/dma/dma-uclass.c</em>
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|-> dma_get_by_index(dev, index, dma); <em class="hl-comment">// drivers/dma/dma-uclass.c</em>
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|-> uclass_get_device_by_ofnode(UCLASS_DMA, args.node, &dev_dma);
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| <em class="hl-comment">// drivers/core/uclass.c</em>
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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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aic_dma_probe(dev); <em class="hl-comment">// drivers/dma/artinchip_dma.c</em></pre></div>
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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="#dma_drivers__section_og5_mnr_c1c" data-tocid="dma_drivers__section_og5_mnr_c1c">驱动框架</a></div></li><li class="section-item"><div class="section-title"><a href="#dma_drivers__section_tg5_mnr_c1c" data-tocid="dma_drivers__section_tg5_mnr_c1c">驱动接口</a></div></li><li class="section-item"><div class="section-title"><a href="#dma_drivers__section_vg5_mnr_c1c" data-tocid="dma_drivers__section_vg5_mnr_c1c">实现说明</a></div></li><li class="section-item"><div class="section-title"><a href="#dma_drivers__section_bh5_mnr_c1c" data-tocid="dma_drivers__section_bh5_mnr_c1c">初始化流程</a></div></li></ul></div>
|
||
|
||
</div>
|
||
</nav>
|
||
|
||
</div>
|
||
</div>
|
||
|
||
|
||
|
||
</div>
|
||
<footer class="navbar navbar-default wh_footer">
|
||
<div class=" footer-container mx-auto ">
|
||
<title>footer def</title>
|
||
<style><!--
|
||
|
||
.p1 {
|
||
font-family: FangZhengShuSong, Times, serif;
|
||
}
|
||
.p2 {
|
||
font-family: Arial, Helvetica, sans-serif;
|
||
}
|
||
.p3 {
|
||
font-family: "Lucida Console", "Courier New", monospace;
|
||
}
|
||
|
||
--></style>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<div class="webhelp.fragment.footer">
|
||
<p class="p1">Copyright © 2019-2024 广东匠芯创科技有限公司. All rights reserved.</p>
|
||
</div><div>
|
||
<div class="generation_time">
|
||
Update Time: 2025-01-21
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</footer>
|
||
|
||
<div id="go2top" class="d-print-none">
|
||
<span class="oxy-icon oxy-icon-up"></span>
|
||
</div>
|
||
|
||
<div id="modal_img_large" class="modal">
|
||
<span class="close oxy-icon oxy-icon-remove"></span>
|
||
<div id="modal_img_container"></div>
|
||
<div id="caption"></div>
|
||
</div>
|
||
|
||
|
||
<script src="${pd}/publishing/publishing-styles-AIC-template/js/custom.js" defer="defer"></script>
|
||
|
||
|
||
</body>
|
||
</html> |