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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-interface-design.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">接口设计</h1><div class="date inPage">26 Nov 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"><p class="- topic/p p" data-ofbid="d71877e22__20250121171522">以下接口是遵循 Linux DMA Engine 子系统的标准接口：</p><div class="table-container"><table class="- topic/table table frame-all" id="concept_lws_bsf_h1c__table_v2g_vps_c1c" data-ofbid="concept_lws_bsf_h1c__table_v2g_vps_c1c" data-cols="2"><caption class="- topic/title title tablecap" data-caption-side="top" data-is-repeated="true"><span class="table--title-label">表<span class="table--title-label-number"> 1</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">aic_dma_config</span></caption><colgroup><col style="width:25%"/><col style="width:75%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="concept_lws_bsf_h1c__table_v2g_vps_c1c__entry__1">函数原型</th><th class="- topic/entry entry colsep-0 rowsep-1" id="concept_lws_bsf_h1c__table_v2g_vps_c1c__entry__2">static int aic_dma_config(struct dma_chan *chan, struct
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dma_slave_config *config)</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_lws_bsf_h1c__table_v2g_vps_c1c__entry__1">功能说明</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="concept_lws_bsf_h1c__table_v2g_vps_c1c__entry__2">配置指定的 DMA 物理通道</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_lws_bsf_h1c__table_v2g_vps_c1c__entry__1">参数定义</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="concept_lws_bsf_h1c__table_v2g_vps_c1c__entry__2">chan - 指向一个 DMA 物理通道<p class="- topic/p p" data-ofbid="d71877e47__20250121171522">config - 保存了需要的配置信息</p></td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_lws_bsf_h1c__table_v2g_vps_c1c__entry__1">返回值</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="concept_lws_bsf_h1c__table_v2g_vps_c1c__entry__2">0，成功</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="concept_lws_bsf_h1c__table_v2g_vps_c1c__entry__1">注意事项</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_lws_bsf_h1c__table_v2g_vps_c1c__entry__2">-</td></tr></tbody></table></div><div class="table-container"><table class="- topic/table table frame-all" id="concept_lws_bsf_h1c__table_w2g_vps_c1c" data-ofbid="concept_lws_bsf_h1c__table_w2g_vps_c1c" data-cols="2"><caption class="- topic/title title tablecap" data-caption-side="top" data-is-repeated="true"><span class="table--title-label">表<span class="table--title-label-number"> 2</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">aic_dma_pause</span></caption><colgroup><col style="width:25%"/><col style="width:75%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="concept_lws_bsf_h1c__table_w2g_vps_c1c__entry__1">函数原型</th><th class="- topic/entry entry colsep-0 rowsep-1" id="concept_lws_bsf_h1c__table_w2g_vps_c1c__entry__2">static int aic_dma_pause(struct dma_chan *chan)</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_lws_bsf_h1c__table_w2g_vps_c1c__entry__1">功能说明</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="concept_lws_bsf_h1c__table_w2g_vps_c1c__entry__2">暂停指定通道的传输操作</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_lws_bsf_h1c__table_w2g_vps_c1c__entry__1">参数定义</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="concept_lws_bsf_h1c__table_w2g_vps_c1c__entry__2">chan - 指向一个 DMA 物理通道</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_lws_bsf_h1c__table_w2g_vps_c1c__entry__1">返回值</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="concept_lws_bsf_h1c__table_w2g_vps_c1c__entry__2">0，成功</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="concept_lws_bsf_h1c__table_w2g_vps_c1c__entry__1">注意事项</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_lws_bsf_h1c__table_w2g_vps_c1c__entry__2">-</td></tr></tbody></table></div><div class="table-container"><table class="- topic/table table frame-all" id="concept_lws_bsf_h1c__table_x2g_vps_c1c" data-ofbid="concept_lws_bsf_h1c__table_x2g_vps_c1c" data-cols="2"><caption class="- topic/title title tablecap" data-caption-side="top" data-is-repeated="true"><span class="table--title-label">表<span class="table--title-label-number"> 3</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">aic_dma_resume</span></caption><colgroup><col style="width:25%"/><col style="width:75%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="concept_lws_bsf_h1c__table_x2g_vps_c1c__entry__1">函数原型</th><th class="- topic/entry entry colsep-0 rowsep-1" id="concept_lws_bsf_h1c__table_x2g_vps_c1c__entry__2">static int aic_dma_resume(struct dma_chan *chan)</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_lws_bsf_h1c__table_x2g_vps_c1c__entry__1">功能说明</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="concept_lws_bsf_h1c__table_x2g_vps_c1c__entry__2">恢复指定通道的传输操作</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_lws_bsf_h1c__table_x2g_vps_c1c__entry__1">参数定义</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="concept_lws_bsf_h1c__table_x2g_vps_c1c__entry__2">chan - 指向一个 DMA 物理通道</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_lws_bsf_h1c__table_x2g_vps_c1c__entry__1">返回值</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="concept_lws_bsf_h1c__table_x2g_vps_c1c__entry__2">0，成功</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="concept_lws_bsf_h1c__table_x2g_vps_c1c__entry__1">注意事项</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_lws_bsf_h1c__table_x2g_vps_c1c__entry__2">-</td></tr></tbody></table></div><div class="table-container"><table class="- topic/table table frame-all" id="concept_lws_bsf_h1c__table_y2g_vps_c1c" data-ofbid="concept_lws_bsf_h1c__table_y2g_vps_c1c" data-cols="2"><caption class="- topic/title title tablecap" data-caption-side="top" data-is-repeated="true"><span class="table--title-label">表<span class="table--title-label-number"> 4</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">aic_dma_prep_dma_memcpy</span></caption><colgroup><col style="width:25%"/><col style="width:75%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="concept_lws_bsf_h1c__table_y2g_vps_c1c__entry__1">函数原型</th><th class="- topic/entry entry colsep-0 rowsep-1" id="concept_lws_bsf_h1c__table_y2g_vps_c1c__entry__2">static struct dma_async_tx_descriptor *aic_dma_prep_dma_memcpy(struct
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dma_chan *chan,dma_addr_t dest, dma_addr_t src,size_t len, unsigned long
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flags)</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_lws_bsf_h1c__table_y2g_vps_c1c__entry__1">功能说明</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="concept_lws_bsf_h1c__table_y2g_vps_c1c__entry__2">memcpy 操作的预处理</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_lws_bsf_h1c__table_y2g_vps_c1c__entry__1">参数定义</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="concept_lws_bsf_h1c__table_y2g_vps_c1c__entry__2">chan - 指向一个 DMA 物理通道<p class="- topic/p p" data-ofbid="d71877e148__20250121171522">dest - 目标 Buffer 的物理地址</p><p class="- topic/p p" data-ofbid="d71877e150__20250121171522">src - 源 Buffer
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的物理地址</p><p class="- topic/p p" data-ofbid="d71877e152__20250121171522">len - 数据长度</p><p class="- topic/p p" data-ofbid="d71877e154__20250121171522">flags - 一些标记</p></td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_lws_bsf_h1c__table_y2g_vps_c1c__entry__1">返回值</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="concept_lws_bsf_h1c__table_y2g_vps_c1c__entry__2">成功，则返回一个 DMA 描述符。失败，返回 NULL</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="concept_lws_bsf_h1c__table_y2g_vps_c1c__entry__1">注意事项</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_lws_bsf_h1c__table_y2g_vps_c1c__entry__2">-</td></tr></tbody></table></div><div class="table-container"><table class="- topic/table table frame-all" id="concept_lws_bsf_h1c__table_z2g_vps_c1c" data-ofbid="concept_lws_bsf_h1c__table_z2g_vps_c1c" data-cols="2"><caption class="- topic/title title tablecap" data-caption-side="top" data-is-repeated="true"><span class="table--title-label">表<span class="table--title-label-number"> 5</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">aic_dma_prep_slave_sg</span></caption><colgroup><col style="width:25%"/><col style="width:75%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="concept_lws_bsf_h1c__table_z2g_vps_c1c__entry__1">函数原型</th><th class="- topic/entry entry colsep-0 rowsep-1" id="concept_lws_bsf_h1c__table_z2g_vps_c1c__entry__2">static struct dma_async_tx_descriptor *aic_dma_prep_slave_sg(struct
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dma_chan *chan,struct scatterlist *sgl, unsigned int sg_len,enum
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dma_transfer_direction dir, unsigned long flags,void *context)</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_lws_bsf_h1c__table_z2g_vps_c1c__entry__1">功能说明</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="concept_lws_bsf_h1c__table_z2g_vps_c1c__entry__2">设备与内存之间传输操作的预处理</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_lws_bsf_h1c__table_z2g_vps_c1c__entry__1">参数定义</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="concept_lws_bsf_h1c__table_z2g_vps_c1c__entry__2">chan - 指向一个 DMA 物理通道<p class="- topic/p p" data-ofbid="d71877e189__20250121171522">sgl - 指向一个散列列表</p><p class="- topic/p p" data-ofbid="d71877e191__20250121171522">sg_len -
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散列中的数据长度</p><p class="- topic/p p" data-ofbid="d71877e193__20250121171522">flags - 一些标记</p><p class="- topic/p p" data-ofbid="d71877e195__20250121171522">context - 指向一些私有的上下文信息</p><p class="- topic/p p" data-ofbid="d71877e197__20250121171522">dir -
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传输方向，是 Dev to Mem，还是 Mem to Dev</p></td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_lws_bsf_h1c__table_z2g_vps_c1c__entry__1">返回值</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="concept_lws_bsf_h1c__table_z2g_vps_c1c__entry__2">成功，则返回一个 DMA 描述符。失败，返回 NULL</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="concept_lws_bsf_h1c__table_z2g_vps_c1c__entry__1">注意事项</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_lws_bsf_h1c__table_z2g_vps_c1c__entry__2">-</td></tr></tbody></table></div><div class="table-container"><table class="- topic/table table frame-all" id="concept_lws_bsf_h1c__table_afg_vps_c1c" data-ofbid="concept_lws_bsf_h1c__table_afg_vps_c1c" data-cols="2"><caption class="- topic/title title tablecap" data-caption-side="top" data-is-repeated="true"><span class="table--title-label">表<span class="table--title-label-number"> 6</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">aic_dma_prep_dma_cyclic</span></caption><colgroup><col style="width:25%"/><col style="width:75%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="concept_lws_bsf_h1c__table_afg_vps_c1c__entry__1">函数原型</th><th class="- topic/entry entry colsep-0 rowsep-1" id="concept_lws_bsf_h1c__table_afg_vps_c1c__entry__2">static struct dma_async_tx_descriptor *aic_dma_prep_dma_cyclic(struct
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dma_chan *chan,dma_addr_t buf_addr, size_t buf_len, size_t
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period_len,enum dma_transfer_direction dir, unsigned long flags)</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_lws_bsf_h1c__table_afg_vps_c1c__entry__1">功能说明</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="concept_lws_bsf_h1c__table_afg_vps_c1c__entry__2">（设备与内存之间）循环传输操作的预处理</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_lws_bsf_h1c__table_afg_vps_c1c__entry__1">参数定义</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="concept_lws_bsf_h1c__table_afg_vps_c1c__entry__2">chan - 指向一个 DMA 物理通道<p class="- topic/p p" data-ofbid="d71877e232__20250121171522">buf_addr - 循环 Buffer 的起始物理地址</p><p class="- topic/p p" data-ofbid="d71877e234__20250121171522">buf_len -
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循环 Buffer 的总长度</p><p class="- topic/p p" data-ofbid="d71877e236__20250121171522">period_len - 循环的 Buffer 片段长度</p><p class="- topic/p p" data-ofbid="d71877e238__20250121171522">dir - 传输方向，是
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Dev to Mem，还是 Mem to Dev</p><p class="- topic/p p" data-ofbid="d71877e240__20250121171522">flags - 一些标记</p></td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_lws_bsf_h1c__table_afg_vps_c1c__entry__1">返回值</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="concept_lws_bsf_h1c__table_afg_vps_c1c__entry__2"><span class="- topic/ph ph">成功，则返回一个 DMA 描述符。失败，返回 NULL</span></td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="concept_lws_bsf_h1c__table_afg_vps_c1c__entry__1">注意事项</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_lws_bsf_h1c__table_afg_vps_c1c__entry__2">-</td></tr></tbody></table></div><div class="table-container"><table class="- topic/table table frame-all" id="concept_lws_bsf_h1c__table_bfg_vps_c1c" data-ofbid="concept_lws_bsf_h1c__table_bfg_vps_c1c" data-cols="2"><caption class="- topic/title title tablecap" data-caption-side="top" data-is-repeated="true"><span class="table--title-label">表<span class="table--title-label-number"> 7</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">aic_dma_issue_pending</span></caption><colgroup><col style="width:25%"/><col style="width:75%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="concept_lws_bsf_h1c__table_bfg_vps_c1c__entry__1">函数原型</th><th class="- topic/entry entry colsep-0 rowsep-1" id="concept_lws_bsf_h1c__table_bfg_vps_c1c__entry__2">static void aic_dma_issue_pending(struct dma_chan *chan)</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_lws_bsf_h1c__table_bfg_vps_c1c__entry__1">功能说明</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="concept_lws_bsf_h1c__table_bfg_vps_c1c__entry__2">启动指定通道的数据传输</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_lws_bsf_h1c__table_bfg_vps_c1c__entry__1">参数定义</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="concept_lws_bsf_h1c__table_bfg_vps_c1c__entry__2">chan - 指向一个 DMA 物理通道</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_lws_bsf_h1c__table_bfg_vps_c1c__entry__1">返回值</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="concept_lws_bsf_h1c__table_bfg_vps_c1c__entry__2">无</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="concept_lws_bsf_h1c__table_bfg_vps_c1c__entry__1">注意事项</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_lws_bsf_h1c__table_bfg_vps_c1c__entry__2">-</td></tr></tbody></table></div><div class="table-container"><table class="- topic/table table frame-all" id="concept_lws_bsf_h1c__table_cfg_vps_c1c" data-ofbid="concept_lws_bsf_h1c__table_cfg_vps_c1c" data-cols="2"><caption class="- topic/title title tablecap" data-caption-side="top" data-is-repeated="true"><span class="table--title-label">表<span class="table--title-label-number"> 8</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">aic_dma_terminate_all</span></caption><colgroup><col style="width:25%"/><col style="width:75%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="concept_lws_bsf_h1c__table_cfg_vps_c1c__entry__1">函数原型</th><th class="- topic/entry entry colsep-0 rowsep-1" id="concept_lws_bsf_h1c__table_cfg_vps_c1c__entry__2">static int aic_dma_terminate_all(struct dma_chan *chan)</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_lws_bsf_h1c__table_cfg_vps_c1c__entry__1">功能说明</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="concept_lws_bsf_h1c__table_cfg_vps_c1c__entry__2">终止所有通道的数据传输</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_lws_bsf_h1c__table_cfg_vps_c1c__entry__1">参数定义</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="concept_lws_bsf_h1c__table_cfg_vps_c1c__entry__2">chan - 指向一个 DMA 物理通道</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="concept_lws_bsf_h1c__table_cfg_vps_c1c__entry__1">返回值</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="concept_lws_bsf_h1c__table_cfg_vps_c1c__entry__2">0，成功</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="concept_lws_bsf_h1c__table_cfg_vps_c1c__entry__1">注意事项</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="concept_lws_bsf_h1c__table_cfg_vps_c1c__entry__2">-</td></tr></tbody></table></div></div></article></main></div>
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