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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/mmc-drivers.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">MMC</h1><div class="date inPage">4 Dec 2024</div><div style="color: gray;">
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Read time: 9 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><p class="- topic/p p" data-ofbid="d250701e22__20250121171703">本章节描述 MMC 驱动的相关配置和使用。</p><section class="- topic/section section" id="mmc_0__section_ol4_lch_bzb" data-ofbid="mmc_0__section_ol4_lch_bzb"><h2 class="- topic/title title sectiontitle">驱动框架</h2>
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<p class="- topic/p p" data-ofbid="d250701e29__20250121171703">U-Boot 驱动模型支持 MMC，并且通过块设备接口对 MMC 进行访问。ArtInChip 平台中， SPL 和 U-Boot 阶段都支持 MMC 已经块设备接口。
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相关配置为：</p>
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<ul class="- topic/ul ul" id="mmc_0__ul_ql4_lch_bzb" data-ofbid="mmc_0__ul_ql4_lch_bzb"><li class="- topic/li li" data-ofbid="d250701e33__20250121171703">
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<p class="- topic/p p" data-ofbid="d250701e35__20250121171703">CONFIG_MMC</p>
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</li><li class="- topic/li li" data-ofbid="d250701e38__20250121171703">
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<p class="- topic/p p" data-ofbid="d250701e40__20250121171703">CONFIG_DM_MMC</p>
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</li><li class="- topic/li li" data-ofbid="d250701e43__20250121171703">
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<p class="- topic/p p" data-ofbid="d250701e45__20250121171703">CONFIG_SPL_DM_MMC</p>
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</li><li class="- topic/li li" data-ofbid="d250701e48__20250121171703">
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<p class="- topic/p p" data-ofbid="d250701e50__20250121171703">CONFIG_BLK</p>
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</li><li class="- topic/li li" data-ofbid="d250701e53__20250121171703">
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<p class="- topic/p p" data-ofbid="d250701e55__20250121171703">CONFIG_SPL_BLK</p>
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</li><li class="- topic/li li" data-ofbid="d250701e58__20250121171703">
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<p class="- topic/p p" data-ofbid="d250701e60__20250121171703">CONFIG_MMC_ARTINCHIP</p>
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</li></ul>
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<p class="- topic/p p" data-ofbid="d250701e64__20250121171703">相关源码有：</p>
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<ul class="- topic/ul ul" id="mmc_0__ul_sl4_lch_bzb" data-ofbid="mmc_0__ul_sl4_lch_bzb"><li class="- topic/li li" data-ofbid="d250701e68__20250121171703">
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<p class="- topic/p p" data-ofbid="d250701e70__20250121171703"><span class="+ topic/ph sw-d/filepath ph filepath">include/mmc.h</span></p>
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</li><li class="- topic/li li" data-ofbid="d250701e74__20250121171703">
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<p class="- topic/p p" data-ofbid="d250701e76__20250121171703"><span class="+ topic/ph sw-d/filepath ph filepath">include/blk.h</span></p>
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</li><li class="- topic/li li" data-ofbid="d250701e80__20250121171703">
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<p class="- topic/p p" data-ofbid="d250701e82__20250121171703"><span class="+ topic/ph sw-d/filepath ph filepath">drivers/block/blk-uclass.c</span></p>
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</li><li class="- topic/li li" data-ofbid="d250701e86__20250121171703">
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<p class="- topic/p p" data-ofbid="d250701e88__20250121171703"><span class="+ topic/ph sw-d/filepath ph filepath">drivers/mmc/mmc-uclass.c</span></p>
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</li><li class="- topic/li li" data-ofbid="d250701e92__20250121171703">
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<p class="- topic/p p" data-ofbid="d250701e94__20250121171703"><span class="+ topic/ph sw-d/filepath ph filepath">drivers/mmc/artinchip_mmc.c</span></p>
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</li></ul>
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</section><section class="- topic/section section" id="mmc_0__section_tl4_lch_bzb" data-ofbid="mmc_0__section_tl4_lch_bzb"><h2 class="- topic/title title sectiontitle">驱动接口</h2>
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<div class="- topic/p p" data-ofbid="d250701e104__20250121171703">常用驱动接口：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="mmc_0__codeblock_oj4_d4r_c1c" data-ofbid="mmc_0__codeblock_oj4_d4r_c1c"><strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">long</strong> blk_dread(<strong class="hl-keyword">struct</strong> blk_desc *block_dev, lbaint_t start,
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lbaint_t blkcnt, <strong class="hl-keyword">void</strong> *buffer);
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<strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">long</strong> blk_dwrite(<strong class="hl-keyword">struct</strong> blk_desc *block_dev, lbaint_t start,
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lbaint_t blkcnt, <strong class="hl-keyword">const</strong> <strong class="hl-keyword">void</strong> *buffer);
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<strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">long</strong> blk_derase(<strong class="hl-keyword">struct</strong> blk_desc *block_dev, lbaint_t start,
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lbaint_t blkcnt);
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<strong class="hl-keyword">struct</strong> mmc *mmc_create(<strong class="hl-keyword">const</strong> <strong class="hl-keyword">struct</strong> mmc_config *cfg, <strong class="hl-keyword">void</strong> *priv);
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<strong class="hl-keyword">int</strong> mmc_bind(<strong class="hl-keyword">struct</strong> udevice *dev, <strong class="hl-keyword">struct</strong> mmc *mmc,
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<strong class="hl-keyword">const</strong> <strong class="hl-keyword">struct</strong> mmc_config *cfg);
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<strong class="hl-keyword">void</strong> mmc_destroy(<strong class="hl-keyword">struct</strong> mmc *mmc);
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<strong class="hl-keyword">int</strong> mmc_unbind(<strong class="hl-keyword">struct</strong> udevice *dev);
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<strong class="hl-keyword">int</strong> mmc_initialize(bd_t *bis);
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<strong class="hl-keyword">int</strong> mmc_init(<strong class="hl-keyword">struct</strong> mmc *mmc);
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<strong class="hl-keyword">int</strong> mmc_send_tuning(<strong class="hl-keyword">struct</strong> mmc *mmc, u32 opcode, <strong class="hl-keyword">int</strong> *cmd_error);
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<strong class="hl-keyword">int</strong> mmc_of_parse(<strong class="hl-keyword">struct</strong> udevice *dev, <strong class="hl-keyword">struct</strong> mmc_config *cfg);
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<strong class="hl-keyword">int</strong> mmc_read(<strong class="hl-keyword">struct</strong> mmc *mmc, u64 src, uchar *dst, <strong class="hl-keyword">int</strong> size);
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<strong class="hl-keyword">int</strong> mmc_set_clock(<strong class="hl-keyword">struct</strong> mmc *mmc, uint clock, bool disable);</pre></div>
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</section><section class="- topic/section section" id="mmc_0__section_vl4_lch_bzb" data-ofbid="mmc_0__section_vl4_lch_bzb"><h2 class="- topic/title title sectiontitle">初始化和使用</h2>
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<p class="- topic/p p" data-ofbid="d250701e114__20250121171703">本章节主要介绍 MMC 以及对应的 BLK 设备的初始化流程，以及读写流程。</p>
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</section><section class="- topic/section section" id="mmc_0__section_wl4_lch_bzb" data-ofbid="mmc_0__section_wl4_lch_bzb"><h2 class="- topic/title title sectiontitle">绑定阶段</h2>
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<p class="- topic/p p" data-ofbid="d250701e122__20250121171703">使用时，MMC 设备通过 BLK 块设备接口进行使用。MMC 设备与 BLK 设备之间的关系如 所示。</p>
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<figure class="- topic/fig fig fignone" id="mmc_0__fig_yhv_24r_c1c" data-ofbid="mmc_0__fig_yhv_24r_c1c"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="mmc_0__image_xl4_lch_bzb" src="../../../images/emmc/mmc_relation.png" alt="mmc_relation"/></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">MMC 与 BLK 设备的关系</span></figcaption></figure>
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<p class="- topic/p p" data-ofbid="d250701e132__20250121171703">对于每一个 MMC 设备，在绑定阶段，都会创建一个对应的 MMC_BLK 块设备，并且 MMC_BLK 设备的 <span class="+ topic/keyword pr-d/parmname keyword parmname">parent</span> 指向当前
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MMC 设备。 ArtInChip MMC 设备绑定对应的 MMC 设备驱动， MMC_BLK 设备绑定 <span class="+ topic/keyword pr-d/parmname keyword parmname">mmc-uclass</span> 中的
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<span class="+ topic/keyword pr-d/parmname keyword parmname">mmc_blk</span> 驱动。</p>
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<div class="- topic/p p" data-ofbid="d250701e144__20250121171703">读写操作时，通过 <span class="+ topic/keyword pr-d/parmname keyword parmname">mmc_blk</span> 驱动的读写函数，转为对 MMC
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的操作。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="mmc_0__codeblock_qmt_f4r_c1c" data-ofbid="mmc_0__codeblock_qmt_f4r_c1c"><strong class="hl-keyword">static</strong> <strong class="hl-keyword">const</strong> <strong class="hl-keyword">struct</strong> blk_ops mmc_blk_ops = { <em class="hl-comment">// drivers/mmc/mmc-uclass.c</em>
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.read = mmc_bread,
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#<strong class="hl-keyword">if</strong> CONFIG_IS_ENABLED(MMC_WRITE)
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.write = mmc_bwrite,
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.erase = mmc_berase,
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#endif
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.select_hwpart = mmc_select_hwpart,
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};</pre></div>
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<p class="- topic/p p" data-ofbid="d250701e153__20250121171703">下面的绑定流程演示了创建 MMC_BLK 设备，并且进行关联的过程。</p>
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<p class="- topic/p p" data-ofbid="d250701e156__20250121171703"><strong class="+ topic/ph hi-d/b ph b">使用 PLATDATA 时</strong></p>
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<div class="- topic/p p" data-ofbid="d250701e160__20250121171703">在 SPL 中，使能 PLATDATA
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时的绑定流程如下。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="mmc_0__codeblock_ep4_g4r_c1c" data-ofbid="mmc_0__codeblock_ep4_g4r_c1c">reset <em class="hl-comment">// arch/arm/cpu/armv7/start.S</em>
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|-> _main <em class="hl-comment">// arch/arm/lib/crt0.S</em>
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|-> board_init_f(); <em class="hl-comment">// arch/arm/mach-artinchip/spl.c</em>
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|-> spl_early_init() <em class="hl-comment">// common/spl/spl.c</em>
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|-> spl_common_init(setup_malloc = true) <em class="hl-comment">// common/spl/spl.c</em>
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|-> dm_init_and_scan(!CONFIG_IS_ENABLED(OF_PLATDATA));
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|-> dm_scan_platdata(pre_reloc_only=false)
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|-> lists_bind_drivers();
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|-> device_bind_by_name(parent, false, entry, &dev);
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|-> drv = lists_driver_lookup_name(info->name);
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| <em class="hl-comment">// 搜索 U_BOOT_DRIVER(name) 声明的 driver</em>
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|-> device_bind_common(); <em class="hl-comment">// drivers/core/device.c</em>
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|-> uclass_get(&uc);
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|-> uclass_bind_device(dev);
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|-> drv->bind(dev);
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aic_dwmmc_bind(dev);
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|
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+----------------------------------+
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|
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aic_dwmmc_bind(dev); <em class="hl-comment">// drivers/mmc/artinchip_dw_mmc.c</em>
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|-> dwmci_bind(dev, ...); <em class="hl-comment">// drivers/mmc/dw_mmc.c</em>
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|
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|-> mmc_bind(dev, &plat->mmc, &plat->cfg) <em class="hl-comment">// drivers/mmc/mmc-uclass.c</em>
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| <em class="hl-comment">// 绑定一个 IF_TYPE_MMC 的 Block 子设备，这样可以通过块设备的接口</em>
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| <em class="hl-comment">// 使用 MMC。</em>
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|
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|-> blk_create_devicef(dev, <span class="hl-string">"mmc_blk"</span>, <span class="hl-string">"blk"</span>,IF_TYPE_MMC, devnum,
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| | <span class="hl-number">512</span>, <span class="hl-number">0</span>, &bdev); <em class="hl-comment">// drivers/block/blk-uclass.c</em>
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| |-> blk_create_device(parent, <span class="hl-string">"mmc_blk"</span>, dev_name, if_type,
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| | devnum, blksz, lba, devp);
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| |-> device_bind_driver(parent, drv_name, name, &dev);
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| | <em class="hl-comment">// drivers/core/lists.c</em>
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| |-> ....
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| |-> device_bind_common(dm_root, ...);
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| |-> uclass_get(drv->id, &uc); id = UCLASS_BLK
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| |-> dev = calloc(<span class="hl-number">1</span>, <strong class="hl-keyword">sizeof</strong>(<strong class="hl-keyword">struct</strong> udevice));
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| | dev->name = name <em class="hl-comment">// 块设备名字</em>
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| | dev->parent = parent <em class="hl-comment">// 指向 MMC 设备</em>
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| | dev->driver = drv <em class="hl-comment">// "mmc_blk" driver</em>
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| | dev->uclass = uc <em class="hl-comment">// UCLASS_BLK</em>
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| | <em class="hl-comment">// 创建设备 mmc_blk</em>
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| |
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| |-> uclass_bind_device(dev);
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| <em class="hl-comment">// 将设备添加到 UCLASS_BLK 列表中</em>
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|
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|-> dev_get_uclass_platdata(bdev);</pre></div>
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<p class="- topic/p p" data-ofbid="d250701e165__20250121171703"><strong class="+ topic/ph hi-d/b ph b">使用 DTS 时</strong></p>
|
||
<p class="- topic/p p" data-ofbid="d250701e169__20250121171703">使用 DTS 时，SPL 和 U-Boot 中的绑定流程如下。在 DTS 中，MMC 控制器是 <span class="+ topic/keyword pr-d/parmname keyword parmname">soc</span> 的子节点， 挂载到
|
||
<span class="+ topic/keyword pr-d/parmname keyword parmname">simple-bus</span> 中，因此相关绑定在 <span class="+ topic/keyword pr-d/parmname keyword parmname">soc</span> 设备绑定
|
||
<span class="+ topic/keyword pr-d/parmname keyword parmname">simple-bus</span> 驱动后被触发， 因此在 <span class="+ topic/keyword pr-d/apiname keyword apiname">simple_bus_post_build()</span>
|
||
中处理。</p>
|
||
<div class="- topic/p p" data-ofbid="d250701e187__20250121171703">U-Boot 阶段的 MMC 绑定在 <code class="+ topic/ph pr-d/codeph ph codeph">initf_dm</code>
|
||
中进行。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="mmc_0__codeblock_rf3_h4r_c1c" data-ofbid="mmc_0__codeblock_rf3_h4r_c1c">simple_bus_post_bind(); <em class="hl-comment">// drivers/core/simple-bus.c</em>
|
||
|-> dm_scan_fdt_dev(dev); <em class="hl-comment">// drivers/core/root.c</em>
|
||
|-> dm_scan_fdt_node();
|
||
|-> lists_bind_fdt(); <em class="hl-comment">// drivers/core/lists.c</em>
|
||
| <em class="hl-comment">// 通过 compatible 匹配设备和驱动</em>
|
||
|-> device_bind_with_driver_data();
|
||
|-> device_bind_common(); <em class="hl-comment">// drivers/core/device.c</em>
|
||
|-> uclass_get(&uc)
|
||
|-> uclass_bind_device(dev)
|
||
|-> drv->bind(dev)
|
||
aic_dwmmc_bind(dev);
|
||
|
|
||
+------------------+
|
||
|
|
||
aic_dwmmc_bind(dev); <em class="hl-comment">// drivers/mmc/artinchip_dw_mmc.c</em>
|
||
|-> dwmci_bind(dev, ...); <em class="hl-comment">// drivers/mmc/dw_mmc.c</em>
|
||
|
|
||
|-> mmc_bind(dev, &plat->mmc, &plat->cfg); <em class="hl-comment">// drivers/mmc/mmc-uclass.c</em>
|
||
| <em class="hl-comment">// 绑定一个 IF_TYPE_MMC 的 Block 子设备，这样可以通过块设备的接口</em>
|
||
| <em class="hl-comment">// 使用 MMC。</em>
|
||
|
|
||
|-> blk_create_devicef(dev, <span class="hl-string">"mmc_blk"</span>, <span class="hl-string">"blk"</span>,IF_TYPE_MMC, devnum,
|
||
| | <span class="hl-number">512</span>, <span class="hl-number">0</span>, &bdev); <em class="hl-comment">// drivers/block/blk-uclass.c</em>
|
||
| |-> blk_create_device(parent, <span class="hl-string">"mmc_blk"</span>, dev_name, if_type,
|
||
| | devnum, blksz, lba, devp);
|
||
| |-> device_bind_driver(parent, drv_name, name, &dev);
|
||
| | <em class="hl-comment">// drivers/core/lists.c</em>
|
||
| |-> ....
|
||
| |-> device_bind_common(dm_root, ...);
|
||
| |-> uclass_get(drv->id, &uc); id = UCLASS_BLK
|
||
| |-> dev = calloc(<span class="hl-number">1</span>, <strong class="hl-keyword">sizeof</strong>(<strong class="hl-keyword">struct</strong> udevice));
|
||
| | dev->name = name; <em class="hl-comment">// 块设备名字</em>
|
||
| | dev->parent = parent; <em class="hl-comment">// 指向 MMC 设备</em>
|
||
| | dev->driver = drv; <em class="hl-comment">// "mmc_blk" driver</em>
|
||
| | dev->uclass = uc; <em class="hl-comment">// UCLASS_BLK</em>
|
||
| | <em class="hl-comment">// 创建设备 mmc_blk</em>
|
||
| |
|
||
| |-> uclass_bind_device(dev);
|
||
| <em class="hl-comment">// 将设备添加到 UCLASS_BLK 列表中</em>
|
||
|
|
||
|-> dev_get_uclass_platdata(bdev);</pre></div>
|
||
</section><section class="- topic/section section" id="mmc_0__section_bm4_lch_bzb" data-ofbid="mmc_0__section_bm4_lch_bzb"><h2 class="- topic/title title sectiontitle">Probe 流程</h2>
|
||
|
||
<div class="- topic/p p" data-ofbid="d250701e200__20250121171703">SPL 中的 Probe 流程如下。由于 BLK 设备的 probe 的目的是调用 <span class="+ topic/keyword pr-d/apiname keyword apiname">mmc_init()</span> ，
|
||
这里直接调用，所以不需要单独的 Probe
|
||
了。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="mmc_0__codeblock_bn1_34r_c1c" data-ofbid="mmc_0__codeblock_bn1_34r_c1c">spl_mmc_load(); <em class="hl-comment">// common/spl/spl_mmc.c</em>
|
||
|-> spl_mmc_find_device(&mmc, bootdev->boot_device);
|
||
| |-> mmc_initialize(NULL); <em class="hl-comment">// drivers/mmc/mmc.c</em>
|
||
| | |-> mmc_probe(bis);
|
||
| |-> uclass_get(UCLASS_MMC, &uc);
|
||
| |-> device_probe(dev); <em class="hl-comment">// drivers/core/device.c</em>
|
||
| | <em class="hl-comment">// 这里对 UCLASS_MMC 列表中的设备逐个调用</em>
|
||
| | <em class="hl-comment">// device_probe(dev)</em>
|
||
| |
|
||
| |--> aic_dwmmc_probe(...) <em class="hl-comment">// 具体驱动的 probe</em>
|
||
|
|
||
|-> mmc_init(mmc);</pre></div>
|
||
<p class="- topic/p p" data-ofbid="d250701e208__20250121171703">U-Boot 中 MMC 设备和对应的 BLK 设备 Probe 流程如下。</p>
|
||
<div class="- topic/p p" data-ofbid="d250701e211__20250121171703">MMC 设备的 Probe 在 <span class="+ topic/keyword pr-d/apiname keyword apiname">board_init_r()</span> 调用 <span class="+ topic/keyword pr-d/apiname keyword apiname">initr_mmc()</span>
|
||
时进行。对应的 BLK 设备的 Probe 在第一次使用时进行，通常是 <span class="+ topic/keyword pr-d/apiname keyword apiname">initr_env()</span> ，该函数加载 MMC
|
||
上的环境变量。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="mmc_0__codeblock_lgy_34r_c1c" data-ofbid="mmc_0__codeblock_lgy_34r_c1c">board_init_r(gd_t *new_gd, ulong dest_addr)
|
||
|-> ...
|
||
|-> initr_dm(<strong class="hl-keyword">void</strong>)
|
||
|-> ...
|
||
|-> initr_mmc(<strong class="hl-keyword">void</strong>)
|
||
|-> initr_env(<strong class="hl-keyword">void</strong>)
|
||
|
||
initr_mmc(<strong class="hl-keyword">void</strong>)
|
||
|-> mmc_initialize(gd->bd); <em class="hl-comment">// drivers/mmc/mmc.c</em>
|
||
|-> mmc_probe(bis = gd->bd);
|
||
|-> uclass_get(UCLASS_MMC, &uc);
|
||
|-> device_probe(dev); <em class="hl-comment">// drivers/core/device.c</em>
|
||
| <em class="hl-comment">// 这里对 UCLASS_MMC 列表中的设备逐个调用</em>
|
||
| <em class="hl-comment">// device_probe(dev)</em>
|
||
|
|
||
|--> aic_dwmmc_probe(...) <em class="hl-comment">// 具体驱动的 probe</em>
|
||
|
||
initr_env(<strong class="hl-keyword">void</strong>) <em class="hl-comment">// common/board_r.c</em>
|
||
|
|
||
|-> env_relocate(<strong class="hl-keyword">void</strong>) <em class="hl-comment">// env/common.c</em>
|
||
|-> env_load(<strong class="hl-keyword">void</strong>) <em class="hl-comment">// env/env.c</em>
|
||
| <em class="hl-comment">// 这个函数执行读取环境变量的动作</em>
|
||
|
|
||
|-> drv = env_driver_lookup(ENVOP_LOAD, prio)
|
||
| <em class="hl-comment">// u-boot 通过 U_BOOT_ENV_LOCATION 宏定义了各种可以用于加载</em>
|
||
| <em class="hl-comment">// 环境变量的驱动 (struct env_driver)，并且在 lds 中将这些</em>
|
||
| <em class="hl-comment">// 驱动收集到一个固定的段中，这里遍历各个驱动，尝试加载 ENV</em>
|
||
|
|
||
|-> drv->load()/env_mmc_load(<strong class="hl-keyword">void</strong>) <em class="hl-comment">// env/mmc.c</em>
|
||
env_mmc_load();
|
||
|
|
||
+---------------+
|
||
|
|
||
env_mmc_load(); <em class="hl-comment">// env/mmc.c</em>
|
||
|--> devno = mmc_get_env_dev();
|
||
|--> mmc = find_mmc_device(devno);
|
||
|--> init_mmc_for_env(mmc)
|
||
|--> blk_get_from_parent(mmc->dev, &dev)
|
||
|--> device_find_first_child(parent, &blkdev);
|
||
| <em class="hl-comment">// 获取 mmc_blk 设备</em>
|
||
|
|
||
|--> device_probe(blkdev)
|
||
|--> mmc_blk_probe(...) <em class="hl-comment">// drivers/mmc/mmc-uclass.c</em>
|
||
|--> mmc_init(mmc) <em class="hl-comment">// drivers/mmc/mmc.c</em></pre></div>
|
||
</section><section class="- topic/section section" id="mmc_0__section_gm4_lch_bzb" data-ofbid="mmc_0__section_gm4_lch_bzb"><h2 class="- topic/title title sectiontitle">读写流程</h2>
|
||
|
||
<div class="- topic/p p" data-ofbid="d250701e230__20250121171703">通过 BLK 接口对 MMC
|
||
进行读写的调用流程如下。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="mmc_0__codeblock_flr_l4r_c1c" data-ofbid="mmc_0__codeblock_flr_l4r_c1c">blk_dread(mmc_get_blk_desc(mmc), blk, cnt, addr);
|
||
| <em class="hl-comment">// drivers/block/blk-uclass.c</em>
|
||
|
|
||
|--> ops->read(dev, start, blkcnt, buffer);
|
||
mmc_bread(dev, start, blkcnt, buffer); <em class="hl-comment">// drivers/mmc/mmc.c</em>
|
||
|--> mmc_read_blocks(mmc, dst, start, cur); <em class="hl-comment">// drivers/mmc/mmc.c</em>
|
||
|--> mmc_send_cmd(mmc, &cmd, &data) <em class="hl-comment">//drivers/mmc/mmc-uclass.c</em>
|
||
|--> ops->send_cmd(dev, cmd, data);
|
||
dwmci_send_cmd(dev, cmd, data); <em class="hl-comment">// drivers/mmc/dw_mmc.c</em>
|
||
|
||
blk_dwrite(mmc_get_blk_desc(mmc), blk, cnt, addr);
|
||
| <em class="hl-comment">// drivers/block/blk-uclass.c</em>
|
||
|
|
||
|--> ops->write(dev, start, blkcnt, buffer);
|
||
mmc_bwrite(dev, start, blkcnt, buffer); <em class="hl-comment">// drivers/mmc/mmc_write.c</em>
|
||
|-> mmc_write_blocks(mmc, start, cur, src); <em class="hl-comment">// drivers/mmc/mmc_write.c</em>
|
||
|--> mmc_send_cmd(mmc, &cmd, &data) <em class="hl-comment">//drivers/mmc/mmc-uclass.c</em>
|
||
|--> ops->send_cmd(dev, cmd, data);
|
||
dwmci_send_cmd(dev, cmd, data); <em class="hl-comment">// drivers/mmc/dw_mmc.c</em></pre></div>
|
||
</section></div></article></main></div>
|
||
|
||
|
||
|
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|
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|
||
|
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<nav role="navigation" id="wh_topic_toc" aria-label="On this page" class="col-lg-2 d-none d-lg-block navbar d-print-none">
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<div id="wh_topic_toc_content">
|
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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="#mmc_0__section_ol4_lch_bzb" data-tocid="mmc_0__section_ol4_lch_bzb">驱动框架</a></div></li><li class="section-item"><div class="section-title"><a href="#mmc_0__section_tl4_lch_bzb" data-tocid="mmc_0__section_tl4_lch_bzb">驱动接口</a></div></li><li class="section-item"><div class="section-title"><a href="#mmc_0__section_vl4_lch_bzb" data-tocid="mmc_0__section_vl4_lch_bzb">初始化和使用</a></div></li><li class="section-item"><div class="section-title"><a href="#mmc_0__section_wl4_lch_bzb" data-tocid="mmc_0__section_wl4_lch_bzb">绑定阶段</a></div></li><li class="section-item"><div class="section-title"><a href="#mmc_0__section_bm4_lch_bzb" data-tocid="mmc_0__section_bm4_lch_bzb">Probe 流程</a></div></li><li class="section-item"><div class="section-title"><a href="#mmc_0__section_gm4_lch_bzb" data-tocid="mmc_0__section_gm4_lch_bzb">读写流程</a></div></li></ul></div>
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