Kernel-3.10.0-957.el7_mmp-dma

• MARVELL MMP DMA controller

Marvell Peripheral DMA Controller
Used platfroms: pxa688, pxa910, pxa3xx, etc

Required properties:

• compatible: Should be “marvell,pdma-1.0”
• reg: Should contain DMA registers location and length.
• interrupts: Either contain all of the per-channel DMA interrupts

    or one irq for pdma device
  

• #dma-channels: Number of DMA channels supported by the controller.

“marvell,pdma-1.0”
Used platfroms: pxa25x, pxa27x, pxa3xx, pxa93x, pxa168, pxa910, pxa688.

Examples:

/*

• Each channel has specific irq
• ICU parse out irq channel from ICU register,
• while DMA controller may not able to distinguish the irq channel
• Using this method, interrupt-parent is required as demuxer
• For example, pxa688 icu register 0x128, bit 0~15 is PDMA channel irq,
• 18~21 is ADMA irq
• /
  pdma: dma-controller@d4000000 {

      compatible = "marvell,pdma-1.0";
      reg = <0xd4000000 0x10000>;
      interrupts = <0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15>;
      interrupt-parent = <&intcmux32>;
      #dma-channels = <16>;
  };
  

/*

• One irq for all channels
• Dmaengine driver (DMA controller) distinguish irq channel via
• parsing internal register
• /
  pdma: dma-controller@d4000000 {

      compatible = "marvell,pdma-1.0";
      reg = <0xd4000000 0x10000>;
      interrupts = <47>;
      #dma-channels = <16>;
  };
  

Marvell Two Channel DMA Controller used specifically for audio
Used platfroms: pxa688, pxa910

Required properties:

• compatible: Should be “marvell,adma-1.0” or “marvell,pxa910-squ”
• reg: Should contain DMA registers location and length.
• interrupts: Either contain all of the per-channel DMA interrupts

    or one irq for dma device
  

“marvell,adma-1.0” used on pxa688
“marvell,pxa910-squ” used on pxa910

Examples:

/* each channel has specific irq */
adma0: dma-controller@d42a0800 {
compatible = “marvell,adma-1.0”;
reg = <0xd42a0800 0x100>;
interrupts = <18 19>;
interrupt-parent = <&intcmux32>;
};

/* One irq for all channels */
squ: dma-controller@d42a0800 {
compatible = “marvell,pxa910-squ”;
reg = <0xd42a0800 0x100>;
interrupts = <46>;
};