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111 lines
4.1 KiB
111 lines
4.1 KiB
* Freescale enhanced Direct Memory Access(eDMA) Controller |
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The eDMA channels have multiplex capability by programmble memory-mapped |
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registers. channels are split into two groups, called DMAMUX0 and DMAMUX1, |
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specific DMA request source can only be multiplexed by any channel of certain |
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group, DMAMUX0 or DMAMUX1, but not both. |
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* eDMA Controller |
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Required properties: |
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- compatible : |
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- "fsl,vf610-edma" for eDMA used similar to that on Vybrid vf610 SoC |
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- "fsl,imx7ulp-edma" for eDMA2 used similar to that on i.mx7ulp |
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- "fsl,ls1028a-edma" followed by "fsl,vf610-edma" for eDMA used on the |
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LS1028A SoC. |
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- reg : Specifies base physical address(s) and size of the eDMA registers. |
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The 1st region is eDMA control register's address and size. |
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The 2nd and the 3rd regions are programmable channel multiplexing |
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control register's address and size. |
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- interrupts : A list of interrupt-specifiers, one for each entry in |
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interrupt-names on vf610 similar SoC. But for i.mx7ulp per channel |
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per transmission interrupt, total 16 channel interrupt and 1 |
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error interrupt(located in the last), no interrupt-names list on |
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i.mx7ulp for clean on dts. |
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- #dma-cells : Must be <2>. |
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The 1st cell specifies the DMAMUX(0 for DMAMUX0 and 1 for DMAMUX1). |
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Specific request source can only be multiplexed by specific channels |
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group called DMAMUX. |
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The 2nd cell specifies the request source(slot) ID. |
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See the SoC's reference manual for all the supported request sources. |
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- dma-channels : Number of channels supported by the controller |
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- clock-names : A list of channel group clock names. Should contain: |
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"dmamux0" - clock name of mux0 group |
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"dmamux1" - clock name of mux1 group |
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Note: No dmamux0 on i.mx7ulp, but another 'dma' clk added on i.mx7ulp. |
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- clocks : A list of phandle and clock-specifier pairs, one for each entry in |
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clock-names. |
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Optional properties: |
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- big-endian: If present registers and hardware scatter/gather descriptors |
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of the eDMA are implemented in big endian mode, otherwise in little |
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mode. |
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- interrupt-names : Should contain the below on vf610 similar SoC but not used |
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on i.mx7ulp similar SoC: |
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"edma-tx" - the transmission interrupt |
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"edma-err" - the error interrupt |
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Examples: |
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edma0: dma-controller@40018000 { |
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#dma-cells = <2>; |
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compatible = "fsl,vf610-edma"; |
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reg = <0x40018000 0x2000>, |
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<0x40024000 0x1000>, |
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<0x40025000 0x1000>; |
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interrupts = <0 8 IRQ_TYPE_LEVEL_HIGH>, |
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<0 9 IRQ_TYPE_LEVEL_HIGH>; |
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interrupt-names = "edma-tx", "edma-err"; |
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dma-channels = <32>; |
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clock-names = "dmamux0", "dmamux1"; |
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clocks = <&clks VF610_CLK_DMAMUX0>, |
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<&clks VF610_CLK_DMAMUX1>; |
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}; /* vf610 */ |
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edma1: dma-controller@40080000 { |
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#dma-cells = <2>; |
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compatible = "fsl,imx7ulp-edma"; |
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reg = <0x40080000 0x2000>, |
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<0x40210000 0x1000>; |
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dma-channels = <32>; |
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interrupts = <GIC_SPI 0 IRQ_TYPE_LEVEL_HIGH>, |
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<GIC_SPI 1 IRQ_TYPE_LEVEL_HIGH>, |
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<GIC_SPI 2 IRQ_TYPE_LEVEL_HIGH>, |
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<GIC_SPI 3 IRQ_TYPE_LEVEL_HIGH>, |
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<GIC_SPI 4 IRQ_TYPE_LEVEL_HIGH>, |
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<GIC_SPI 5 IRQ_TYPE_LEVEL_HIGH>, |
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<GIC_SPI 6 IRQ_TYPE_LEVEL_HIGH>, |
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<GIC_SPI 7 IRQ_TYPE_LEVEL_HIGH>, |
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<GIC_SPI 8 IRQ_TYPE_LEVEL_HIGH>, |
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<GIC_SPI 9 IRQ_TYPE_LEVEL_HIGH>, |
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<GIC_SPI 10 IRQ_TYPE_LEVEL_HIGH>, |
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<GIC_SPI 11 IRQ_TYPE_LEVEL_HIGH>, |
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<GIC_SPI 12 IRQ_TYPE_LEVEL_HIGH>, |
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<GIC_SPI 13 IRQ_TYPE_LEVEL_HIGH>, |
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<GIC_SPI 14 IRQ_TYPE_LEVEL_HIGH>, |
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<GIC_SPI 15 IRQ_TYPE_LEVEL_HIGH>, |
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/* last is eDMA2-ERR interrupt */ |
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<GIC_SPI 16 IRQ_TYPE_LEVEL_HIGH>; |
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clock-names = "dma", "dmamux0"; |
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clocks = <&pcc2 IMX7ULP_CLK_DMA1>, |
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<&pcc2 IMX7ULP_CLK_DMA_MUX1>; |
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}; /* i.mx7ulp */ |
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* DMA clients |
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DMA client drivers that uses the DMA function must use the format described |
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in the dma.txt file, using a two-cell specifier for each channel: the 1st |
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specifies the channel group(DMAMUX) in which this request can be multiplexed, |
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and the 2nd specifies the request source. |
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Examples: |
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sai2: sai@40031000 { |
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compatible = "fsl,vf610-sai"; |
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reg = <0x40031000 0x1000>; |
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interrupts = <0 86 IRQ_TYPE_LEVEL_HIGH>; |
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clock-names = "sai"; |
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clocks = <&clks VF610_CLK_SAI2>; |
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dma-names = "tx", "rx"; |
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dmas = <&edma0 0 21>, |
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<&edma0 0 20>; |
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};
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