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class="shortdesc">SPI ENC、CE、eFuse 等安全模块的介绍和使用说明。</p></div></div></div></li></ul></li></ul></div>
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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/i2c/i2c_design.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">设计说明</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">
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<p class="- topic/p p" data-ofbid="d139747e33__20250123155213">源代码位于：<span class="+ topic/ph sw-d/filepath ph filepath">linux-5.10/drivers/i2c/busses/</span></p>
|
||
<p class="- topic/p p" data-ofbid="d139747e38__20250123155213"> I2C 的驱动文件如下：</p>
|
||
<div class="table-container"><table class="- topic/table table frame-all" id="i2c_design_intro__table_lnt_y5r_21c" data-ofbid="i2c_design_intro__table_lnt_y5r_21c" data-cols="2"><caption></caption><colgroup><col style="width:39.0625%"/><col style="width:60.9375%"/></colgroup><thead class="- topic/thead thead">
|
||
<tr class="- topic/row">
|
||
<th class="- topic/entry entry colsep-1 rowsep-1" id="i2c_design_intro__table_lnt_y5r_21c__entry__1">文件</th>
|
||
<th class="- topic/entry entry colsep-0 rowsep-1" id="i2c_design_intro__table_lnt_y5r_21c__entry__2">说明</th>
|
||
</tr>
|
||
</thead><tbody class="- topic/tbody tbody">
|
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<tr class="- topic/row">
|
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<td class="- topic/entry entry colsep-1 rowsep-1" headers="i2c_design_intro__table_lnt_y5r_21c__entry__1"><span class="+ topic/ph sw-d/filepath ph filepath">i2c-artinchip.h</span></td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="i2c_design_intro__table_lnt_y5r_21c__entry__2">aic I2C 公用头文件，I2C 模块的寄存器定义，结构体定义等</td>
|
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</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="i2c_design_intro__table_lnt_y5r_21c__entry__1"><span class="+ topic/ph sw-d/filepath ph filepath">i2c-artinchip-master.c</span></td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="i2c_design_intro__table_lnt_y5r_21c__entry__2">I2C 作为 master 时的驱动文件</td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-1" headers="i2c_design_intro__table_lnt_y5r_21c__entry__1"><span class="+ topic/ph sw-d/filepath ph filepath">i2c-artinchip-slave.c</span></td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-1" headers="i2c_design_intro__table_lnt_y5r_21c__entry__2">I2C 作为 slave 时的驱动文件</td>
|
||
</tr>
|
||
<tr class="- topic/row">
|
||
<td class="- topic/entry entry colsep-1 rowsep-0" headers="i2c_design_intro__table_lnt_y5r_21c__entry__1"><span class="+ topic/ph sw-d/filepath ph filepath">i2c-artinchip-common.c</span></td>
|
||
<td class="- topic/entry entry colsep-0 rowsep-0" headers="i2c_design_intro__table_lnt_y5r_21c__entry__2">I2C 一些公用寄存器读写函数的实现，以及 driver 的定义</td>
|
||
</tr>
|
||
</tbody></table></div>
|
||
<section class="- topic/section section" id="i2c_design_intro__section_mnt_y5r_21c" data-ofbid="i2c_design_intro__section_mnt_y5r_21c"><h2 class="- topic/title title sectiontitle">模块架构</h2>
|
||
|
||
<p class="- topic/p p" data-ofbid="d139747e111__20250123155213">linux 中 C 子系统的体系结构如下图所示</p>
|
||
<div class="- topic/p p" data-ofbid="d139747e114__20250123155213">
|
||
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="i2c_design_intro__image_nnt_y5r_21c" src="../../../images/i2c/subsystem_arch.png" alt="subsystem_arch"/></div><br/>
|
||
</div>
|
||
<div class="- topic/p p" data-ofbid="d139747e123__20250123155213">在 C 子系统中，SOC 厂商需要实现的就是 adapter 部分的驱动，I2C adapter 是对 controller 的软件抽象。具体到上图，就是实现
|
||
adapter 的 algorithm 以及特定 SOC 的 I2C 代码部分。I2C 模块支持 master 和 slave 两种模式，所以 adapter
|
||
的驱动实现也就分为两部分：I2C master 驱动和 slave 驱动。<ul class="- topic/ul ul" id="i2c_design_intro__ul_dwk_2vr_21c" data-ofbid="i2c_design_intro__ul_dwk_2vr_21c">
|
||
<li class="- topic/li li" data-ofbid="d139747e127__20250123155213">
|
||
<p class="- topic/p p" data-ofbid="d139747e129__20250123155213">I2C master</p>
|
||
<p class="- topic/p p" data-ofbid="d139747e132__20250123155213">I2C 作为 master 时，驱动的实现主要包括 4 个部分：</p>
|
||
<ol class="- topic/ol ol" id="i2c_design_intro__ol_pnt_y5r_21c" data-ofbid="i2c_design_intro__ol_pnt_y5r_21c">
|
||
<li class="- topic/li li" data-ofbid="d139747e137__20250123155213">
|
||
<p class="- topic/p p" data-ofbid="d139747e139__20250123155213">硬件参数配置：主要是设置 C 工作的主机模式，7bit 或 10bit 寻址，寻址的从机地址设置，FIFO
|
||
设置以及总线传输速率等。</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d139747e143__20250123155213">
|
||
<p class="- topic/p p" data-ofbid="d139747e145__20250123155213">SCL 时序参数设置：根据设置的总线传输速率，设置 SCL 的高低电平时间。</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d139747e149__20250123155213">
|
||
<p class="- topic/p p" data-ofbid="d139747e151__20250123155213">i2c_algorithm 的实现：作为主机端，主要是 xfer 的实现。在驱动实现中，以 message
|
||
为单位进行数据的收发，数据的传输采用中断的方式。</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d139747e155__20250123155213">
|
||
<p class="- topic/p p" data-ofbid="d139747e157__20250123155213">中断的处理：处理 master 端的数据收发，并产生相应的 start、ack、nack、restart、stop 信号。</p>
|
||
</li>
|
||
</ol>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d139747e163__20250123155213">I2C slave<p class="- topic/p p" data-ofbid="d139747e165__20250123155213">I2C 作为从机时，需要一个相应的后端软件(对 C 从设备的软件模拟)，该后端软件与 adapter 驱动，组合成具有相应功能的
|
||
C 从设备。内核的 C 子系统框架中提供了一个 EEPROM 的软件后端，与 slave 驱动一起，可以作为一个具有 C 接口的 EEPROM
|
||
使用。</p><div class="- topic/p p" data-ofbid="d139747e167__20250123155213">
|
||
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="i2c_design_intro__image_grg_kvr_21c" src="../../../images/i2c/twi_slave.png" width="384" alt="twi_slave"/></div><br/>
|
||
</div><p class="- topic/p p" data-ofbid="d139747e175__20250123155213">I2C 作为 slave 时，驱动的实现主要包括 3 个部分：</p><ol class="- topic/ol ol" id="i2c_design_intro__ol_hrg_kvr_21c" data-ofbid="i2c_design_intro__ol_hrg_kvr_21c">
|
||
<li class="- topic/li li" data-ofbid="d139747e179__20250123155213">
|
||
<p class="- topic/p p" data-ofbid="d139747e181__20250123155213">硬件参数配置：设置 C 工作的从模式，FIFO 设置等。</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d139747e185__20250123155213">
|
||
<p class="- topic/p p" data-ofbid="d139747e187__20250123155213">i2c_algorithm 的实现：作为从机端，主要是 slave 和 unreg_slave 的实现。reg_slave
|
||
用于将一个 client 注册到从模式的 i2c adapter 上，unreg_slave 的功能与 slave
|
||
相反。</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d139747e191__20250123155213">
|
||
<p class="- topic/p p" data-ofbid="d139747e193__20250123155213">中断的处理：处理 C 从机接收到的各种中断信号，并调用相应的回调函数进行数据的读写。</p>
|
||
</li>
|
||
</ol></li>
|
||
</ul></div>
|
||
<p class="- topic/p p" data-ofbid="d139747e199__20250123155213">综上，I2C 模块的驱动实现，主要的工作有：</p>
|
||
<ul class="- topic/ul ul" id="i2c_design_intro__ul_d4q_kvr_21c" data-ofbid="i2c_design_intro__ul_d4q_kvr_21c">
|
||
<li class="- topic/li li" data-ofbid="d139747e205__20250123155213">
|
||
<p class="- topic/p p" data-ofbid="d139747e207__20250123155213">提供 C 控制器的 platform 驱动，初始化 C 适配器，判断 C 模块工作的主从模式，执行不同的初始化流程。</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d139747e211__20250123155213">
|
||
<p class="- topic/p p" data-ofbid="d139747e213__20250123155213">I2C 模块作为主机时，提供 C 适配器的 algorithm，并用具体适配器的 xfer 函数填充 i2c_algorithm 的 xfer 指针，并把
|
||
algorithm 指针赋值给 i2c_adapter 的 algo 指针。处理 master 端时序的设置以及 I2C
|
||
作为主机时的各种中断信号处理。</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d139747e217__20250123155213">
|
||
<p class="- topic/p p" data-ofbid="d139747e219__20250123155213">I2C 模块作为从机时，提供 C 适配器的 algorithm，实现具体适配器的 slave 和 unreg_slave 函数，并把 algorithm
|
||
指针赋值给 i2c_adapter 的 algo 指针。处理 C 作为从机时的各种中断信号处理。</p>
|
||
</li>
|
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</ul>
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</section>
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