Kernel-2.6.32-573.12.1.el6_dma

published: updated: Kernel_2.6.32-573.12.1.el6_内核文档
  • Freescale 83xx DMA Controller

Freescale PowerPC 83xx have on chip general purpose DMA controllers.

Required properties:

  • compatible : compatible list, contains 2 entries, first is
       "fsl,CHIP-dma", where CHIP is the processor
   (mpc8349, mpc8360, etc.) and the second is
   "fsl,elo-dma"
  • reg :
  • ranges : Should be defined as specified in 1) to describe the
        DMA controller channels.
  • cell-index : controller index. 0 for controller @ 0x8100
  • interrupts :
  • interrupt-parent : optional, if needed for interrupt mapping
  • DMA channel nodes:
      - compatible        : compatible list, contains 2 entries, first is
       "fsl,CHIP-dma-channel", where CHIP is the processor
       (mpc8349, mpc8350, etc.) and the second is
       "fsl,elo-dma-channel". However, see note below.
  - reg               : <registers mapping for channel>
  - cell-index        : dma channel index starts at 0.

Optional properties:
- interrupts :
(on 83xx this is expected to be identical to
the interrupts property of the parent node)
- interrupt-parent : optional, if needed for interrupt mapping

Example:
dma@82a8 {
#address-cells = <1>;
#size-cells = <1>;
compatible = “fsl,mpc8349-dma”, “fsl,elo-dma”;
reg = <0x82a8 4>;
ranges = <0 0x8100 0x1a4>;
interrupt-parent = <&ipic>;
interrupts = <71 8>;
cell-index = <0>;
dma-channel@0 {
compatible = “fsl,mpc8349-dma-channel”, “fsl,elo-dma-channel”;
cell-index = <0>;
reg = <0 0x80>;
};
dma-channel@80 {
compatible = “fsl,mpc8349-dma-channel”, “fsl,elo-dma-channel”;
cell-index = <1>;
reg = <0x80 0x80>;
};
dma-channel@100 {
compatible = “fsl,mpc8349-dma-channel”, “fsl,elo-dma-channel”;
cell-index = <2>;
reg = <0x100 0x80>;
};
dma-channel@180 {
compatible = “fsl,mpc8349-dma-channel”, “fsl,elo-dma-channel”;
cell-index = <3>;
reg = <0x180 0x80>;
};
};

  • Freescale 85xx/86xx DMA Controller

Freescale PowerPC 85xx/86xx have on chip general purpose DMA controllers.

Required properties:

  • compatible : compatible list, contains 2 entries, first is

       "fsl,CHIP-dma", where CHIP is the processor
   (mpc8540, mpc8540, etc.) and the second is
   "fsl,eloplus-dma"

  • reg :

  • cell-index : controller index. 0 for controller @ 0x21000,

                                       1 for controller @ 0xc000

  • ranges : Should be defined as specified in 1) to describe the

        DMA controller channels.

  • DMA channel nodes:

      - compatible        : compatible list, contains 2 entries, first is
       "fsl,CHIP-dma-channel", where CHIP is the processor
       (mpc8540, mpc8560, etc.) and the second is
       "fsl,eloplus-dma-channel". However, see note below.
  - cell-index        : dma channel index starts at 0.
  - reg               : <registers mapping for channel>
  - interrupts        : <interrupt mapping for DMA channel IRQ>
  - interrupt-parent  : optional, if needed for interrupt mapping

Example:
dma@21300 {
#address-cells = <1>;
#size-cells = <1>;
compatible = “fsl,mpc8540-dma”, “fsl,eloplus-dma”;
reg = <0x21300 4>;
ranges = <0 0x21100 0x200>;
cell-index = <0>;
dma-channel@0 {
compatible = “fsl,mpc8540-dma-channel”, “fsl,eloplus-dma-channel”;
reg = <0 0x80>;
cell-index = <0>;
interrupt-parent = <&mpic>;
interrupts = <20 2>;
};
dma-channel@80 {
compatible = “fsl,mpc8540-dma-channel”, “fsl,eloplus-dma-channel”;
reg = <0x80 0x80>;
cell-index = <1>;
interrupt-parent = <&mpic>;
interrupts = <21 2>;
};
dma-channel@100 {
compatible = “fsl,mpc8540-dma-channel”, “fsl,eloplus-dma-channel”;
reg = <0x100 0x80>;
cell-index = <2>;
interrupt-parent = <&mpic>;
interrupts = <22 2>;
};
dma-channel@180 {
compatible = “fsl,mpc8540-dma-channel”, “fsl,eloplus-dma-channel”;
reg = <0x180 0x80>;
cell-index = <3>;
interrupt-parent = <&mpic>;
interrupts = <23 2>;
};
};

Note on DMA channel compatible properties: The compatible property must say
“fsl,elo-dma-channel” or “fsl,eloplus-dma-channel” to be used by the Elo DMA
driver (fsldma). Any DMA channel used by fsldma cannot be used by another
DMA driver, such as the SSI sound drivers for the MPC8610. Therefore, any DMA
channel that should be used for another driver should not use
“fsl,elo-dma-channel” or “fsl,eloplus-dma-channel”. For the SSI drivers, for
example, the compatible property should be “fsl,ssi-dma-channel”. See ssi.txt
for more information.

oosTech by Sam Lee