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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/spienc/spi-enc-key_procedures.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">关键流程设计</h1><div class="date inPage">31 Jan 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"><section class="- topic/section section" id="spi_enc_key_procedures__section_ogd_4yx_21c" data-ofbid="spi_enc_key_procedures__section_ogd_4yx_21c"><h2 class="- topic/title title sectiontitle">初始化</h2>
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<div class="- topic/p p" data-ofbid="d81378e27__20250121171525">
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="spi_enc_key_procedures__codeblock_q1m_pyx_21c" data-ofbid="spi_enc_key_procedures__codeblock_q1m_pyx_21c">aic_spienc_probe();
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|-> drvdata->base = devm_platform_ioremap_resource(pdev, <span class="hl-number">0</span>);
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|-> irq = platform_get_irq(pdev, <span class="hl-number">0</span>);
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|-> devm_request_threaded_irq(dev, irq, aic_spienc_irq_handler,
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aic_spienc_irq_thread, IRQF_ONESHOT,
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dev_name(dev), drvdata);
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|-> drvdata->clk = devm_clk_get(dev, NULL);
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|-> clk_prepare_enable(drvdata->clk);
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|-> devm_reset_control_get(dev, NULL);
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|-> platform_set_drvdata(pdev, drvdata);
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|-> crypto_register_skcipher(&spienc_alg.alg); <em class="hl-comment">// 注册算法</em></pre>
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</div>
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</section><section class="- topic/section section" id="spi_enc_key_procedures__section_b14_nyx_21c" data-ofbid="spi_enc_key_procedures__section_b14_nyx_21c"><h2 class="- topic/title title sectiontitle">加解密配置</h2>
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="spi_enc_key_procedures__codeblock_bdp_pyx_21c" data-ofbid="spi_enc_key_procedures__codeblock_bdp_pyx_21c">aic_spienc_encrypt(req);
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|-> aic_spienc_xcrypt(req);
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|-> aic_spienc_attach_bus(drvdata, ivinfo->spi_id);
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|-> writel(ivinfo->addr, (drvdata->base + SPIE_REG_ADDR));
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|-> writel(ivinfo->cpos, (drvdata->base + SPIE_REG_CPOS));
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|-> writel(clen, (drvdata->base + SPIE_REG_CLEN));
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|-> writel(tweak, (drvdata->base + SPIE_REG_TWEAK));</pre>
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<p class="- topic/p p" data-ofbid="d81378e41__20250121171525">解密流程相同。</p>
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</section><section class="- topic/section section" id="spi_enc_key_procedures__section_d14_nyx_21c" data-ofbid="spi_enc_key_procedures__section_d14_nyx_21c"><h2 class="- topic/title title sectiontitle">中断流程</h2>
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<p class="- topic/p p" data-ofbid="d81378e49__20250121171525">当中断发生时，首先在 irq handler 中读取并保存状态寄存器。</p>
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="spi_enc_key_procedures__codeblock_c3r_pyx_21c" data-ofbid="spi_enc_key_procedures__codeblock_c3r_pyx_21c"><strong class="hl-keyword">static</strong> irqreturn_t aic_spienc_irq_handler(<strong class="hl-keyword">int</strong> irq, <strong class="hl-keyword">void</strong> *arg)
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{
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<strong class="hl-keyword">struct</strong> aic_spienc_drvdata *drvdata = arg;
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drvdata->irq_sts = readl(drvdata->base + SPIE_REG_ISR);
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<strong class="hl-keyword">return</strong> IRQ_WAKE_THREAD;
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}</pre>
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<div class="- topic/p p" data-ofbid="d81378e55__20250121171525">然后唤醒对应的处理线程进行处理。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="spi_enc_key_procedures__codeblock_zrd_ryx_21c" data-ofbid="spi_enc_key_procedures__codeblock_zrd_ryx_21c"><strong class="hl-keyword">static</strong> irqreturn_t aic_spienc_irq_thread(<strong class="hl-keyword">int</strong> irq, <strong class="hl-keyword">void</strong> *arg)
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{
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<strong class="hl-keyword">struct</strong> aic_spienc_drvdata *drvdata = arg;
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<strong class="hl-keyword">struct</strong> crypto_async_request *base;
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<strong class="hl-keyword">int</strong> err = <span class="hl-number">0</span>;
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u32 val = <span class="hl-number">0</span>;
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<strong class="hl-keyword">if</strong> (drvdata->irq_sts & SPIE_INTR_ENC_DEC_FIN_MSK) {
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<strong class="hl-keyword">if</strong> (drvdata->irq_sts & SPIE_INTR_ALL_EMP_MSK)
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err = AIC_SPIENC_ALL_FF;
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base = &drvdata->req->base;
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base->complete(base, err);
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<em class="hl-comment">/* Stop it */</em>
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val = readl((drvdata->base + SPIE_REG_CTL));
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val &= ~SPIE_START_MSK;
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writel(val, (drvdata->base + SPIE_REG_CTL));
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<em class="hl-comment">/* Clear interrupts */</em>
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drvdata->irq_sts = <span class="hl-number">0</span>;
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writel(SPIE_INTR_ALL_MSK, (drvdata->base + SPIE_REG_ISR));
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}
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<strong class="hl-keyword">return</strong> IRQ_HANDLED;
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}</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="#spi_enc_key_procedures__section_ogd_4yx_21c" data-tocid="spi_enc_key_procedures__section_ogd_4yx_21c">初始化</a></div></li><li class="section-item"><div class="section-title"><a href="#spi_enc_key_procedures__section_b14_nyx_21c" data-tocid="spi_enc_key_procedures__section_b14_nyx_21c">加解密配置</a></div></li><li class="section-item"><div class="section-title"><a href="#spi_enc_key_procedures__section_d14_nyx_21c" data-tocid="spi_enc_key_procedures__section_d14_nyx_21c">中断流程</a></div></li></ul></div>
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