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86 lines
2.7 KiB
86 lines
2.7 KiB
* STMicroelectronics Flexible Direct Memory Access Device Tree bindings |
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The FDMA is a general-purpose direct memory access controller capable of |
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supporting 16 independent DMA channels. It accepts up to 32 DMA requests. |
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The FDMA is based on a Slim processor which requires a firmware. |
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* FDMA Controller |
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Required properties: |
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- compatible : Should be one of |
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- st,stih407-fdma-mpe31-11, "st,slim-rproc"; |
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- st,stih407-fdma-mpe31-12, "st,slim-rproc"; |
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- st,stih407-fdma-mpe31-13, "st,slim-rproc"; |
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- reg : Should contain an entry for each name in reg-names |
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- reg-names : Must contain "slimcore", "dmem", "peripherals", "imem" entries |
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- interrupts : Should contain one interrupt shared by all channels |
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- dma-channels : Number of channels supported by the controller |
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- #dma-cells : Must be <3>. See DMA client section below |
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- clocks : Must contain an entry for each clock |
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See: Documentation/devicetree/bindings/clock/clock-bindings.txt |
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Example: |
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fdma0: dma-controller@8e20000 { |
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compatible = "st,stih407-fdma-mpe31-11", "st,slim-rproc"; |
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reg = <0x8e20000 0x8000>, |
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<0x8e30000 0x3000>, |
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<0x8e37000 0x1000>, |
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<0x8e38000 0x8000>; |
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reg-names = "slimcore", "dmem", "peripherals", "imem"; |
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clocks = <&clk_s_c0_flexgen CLK_FDMA>, |
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<&clk_s_c0_flexgen CLK_EXT2F_A9>, |
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<&clk_s_c0_flexgen CLK_EXT2F_A9>, |
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<&clk_s_c0_flexgen CLK_EXT2F_A9>; |
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interrupts = <GIC_SPI 5 IRQ_TYPE_NONE>; |
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dma-channels = <16>; |
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#dma-cells = <3>; |
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}; |
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* DMA client |
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Required properties: |
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- dmas: Comma separated list of dma channel requests |
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- dma-names: Names of the aforementioned requested channels |
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Each dmas request consists of 4 cells: |
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1. A phandle pointing to the FDMA controller |
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2. The request line number |
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3. A 32bit mask specifying (see include/linux/platform_data/dma-st-fdma.h) |
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-bit 2-0: Holdoff value, dreq will be masked for |
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0x0: 0-0.5us |
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0x1: 0.5-1us |
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0x2: 1-1.5us |
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-bit 17: data swap |
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0x0: disabled |
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0x1: enabled |
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-bit 21: Increment Address |
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0x0: no address increment between transfers |
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0x1: increment address between transfers |
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-bit 22: 2 STBus Initiator Coprocessor interface |
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0x0: high priority port |
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0x1: low priority port |
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4. transfers type |
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0 free running |
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1 paced |
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Example: |
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sti_uni_player2: sti-uni-player@2 { |
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compatible = "st,sti-uni-player"; |
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#sound-dai-cells = <0>; |
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st,syscfg = <&syscfg_core>; |
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clocks = <&clk_s_d0_flexgen CLK_PCM_2>; |
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assigned-clocks = <&clk_s_d0_flexgen CLK_PCM_2>; |
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assigned-clock-parents = <&clk_s_d0_quadfs 2>; |
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assigned-clock-rates = <50000000>; |
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reg = <0x8D82000 0x158>; |
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interrupts = <GIC_SPI 86 IRQ_TYPE_NONE>; |
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dmas = <&fdma0 4 0 1>; |
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dai-name = "Uni Player #1 (DAC)"; |
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dma-names = "tx"; |
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st,uniperiph-id = <2>; |
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st,version = <5>; |
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st,mode = "PCM"; |
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};
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