Documentation/powerpc/dts-bindings/fsl/dma.txt

   1 * Freescale 83xx DMA Controller
   2
   3 Freescale PowerPC 83xx have on chip general purpose DMA controllers.
   4
   5 Required properties:
   6
   7 - compatible        : compatible list, contains 2 entries, first is
   8                  "fsl,CHIP-dma", where CHIP is the processor
   9                  (mpc8349, mpc8360, etc.) and the second is
  10                  "fsl,elo-dma"
  11 - reg               : <registers mapping for DMA general status reg>
  12 - ranges                : Should be defined as specified in 1) to describe the
  13                   DMA controller channels.
  14 - cell-index        : controller index.  0 for controller @ 0x8100
  15 - interrupts        : <interrupt mapping for DMA IRQ>
  16 - interrupt-parent  : optional, if needed for interrupt mapping
  17
  18
  19 - DMA channel nodes:
  20         - compatible        : compatible list, contains 2 entries, first is
  21                          "fsl,CHIP-dma-channel", where CHIP is the processor
  22                          (mpc8349, mpc8350, etc.) and the second is
  23                          "fsl,elo-dma-channel". However, see note below.
  24         - reg               : <registers mapping for channel>
  25         - cell-index        : dma channel index starts at 0.
  26
  27 Optional properties:
  28         - interrupts        : <interrupt mapping for DMA channel IRQ>
  29                           (on 83xx this is expected to be identical to
  30                            the interrupts property of the parent node)
  31         - interrupt-parent  : optional, if needed for interrupt mapping
  32
  33 Example:
  34         dma@82a8 {
  35                 #address-cells = <1>;
  36                 #size-cells = <1>;
  37                 compatible = "fsl,mpc8349-dma", "fsl,elo-dma";
  38                 reg = <82a8 4>;
  39                 ranges = <0 8100 1a4>;
  40                 interrupt-parent = <&ipic>;
  41                 interrupts = <47 8>;
  42                 cell-index = <0>;
  43                 dma-channel@0 {
  44                         compatible = "fsl,mpc8349-dma-channel", "fsl,elo-dma-channel";
  45                         cell-index = <0>;
  46                         reg = <0 80>;
  47                 };
  48                 dma-channel@80 {
  49                         compatible = "fsl,mpc8349-dma-channel", "fsl,elo-dma-channel";
  50                         cell-index = <1>;
  51                         reg = <80 80>;
  52                 };
  53                 dma-channel@100 {
  54                         compatible = "fsl,mpc8349-dma-channel", "fsl,elo-dma-channel";
  55                         cell-index = <2>;
  56                         reg = <100 80>;
  57                 };
  58                 dma-channel@180 {
  59                         compatible = "fsl,mpc8349-dma-channel", "fsl,elo-dma-channel";
  60                         cell-index = <3>;
  61                         reg = <180 80>;
  62                 };
  63         };
  64
  65 * Freescale 85xx/86xx DMA Controller
  66
  67 Freescale PowerPC 85xx/86xx have on chip general purpose DMA controllers.
  68
  69 Required properties:
  70
  71 - compatible        : compatible list, contains 2 entries, first is
  72                  "fsl,CHIP-dma", where CHIP is the processor
  73                  (mpc8540, mpc8540, etc.) and the second is
  74                  "fsl,eloplus-dma"
  75 - reg               : <registers mapping for DMA general status reg>
  76 - cell-index        : controller index.  0 for controller @ 0x21000,
  77                                          1 for controller @ 0xc000
  78 - ranges                : Should be defined as specified in 1) to describe the
  79                   DMA controller channels.
  80
  81 - DMA channel nodes:
  82         - compatible        : compatible list, contains 2 entries, first is
  83                          "fsl,CHIP-dma-channel", where CHIP is the processor
  84                          (mpc8540, mpc8560, etc.) and the second is
  85                          "fsl,eloplus-dma-channel". However, see note below.
  86         - cell-index        : dma channel index starts at 0.
  87         - reg               : <registers mapping for channel>
  88         - interrupts        : <interrupt mapping for DMA channel IRQ>
  89         - interrupt-parent  : optional, if needed for interrupt mapping
  90
  91 Example:
  92         dma@21300 {
  93                 #address-cells = <1>;
  94                 #size-cells = <1>;
  95                 compatible = "fsl,mpc8540-dma", "fsl,eloplus-dma";
  96                 reg = <21300 4>;
  97                 ranges = <0 21100 200>;
  98                 cell-index = <0>;
  99                 dma-channel@0 {
 100                         compatible = "fsl,mpc8540-dma-channel", "fsl,eloplus-dma-channel";
 101                         reg = <0 80>;
 102                         cell-index = <0>;
 103                         interrupt-parent = <&mpic>;
 104                         interrupts = <14 2>;
 105                 };
 106                 dma-channel@80 {
 107                         compatible = "fsl,mpc8540-dma-channel", "fsl,eloplus-dma-channel";
 108                         reg = <80 80>;
 109                         cell-index = <1>;
 110                         interrupt-parent = <&mpic>;
 111                         interrupts = <15 2>;
 112                 };
 113                 dma-channel@100 {
 114                         compatible = "fsl,mpc8540-dma-channel", "fsl,eloplus-dma-channel";
 115                         reg = <100 80>;
 116                         cell-index = <2>;
 117                         interrupt-parent = <&mpic>;
 118                         interrupts = <16 2>;
 119                 };
 120                 dma-channel@180 {
 121                         compatible = "fsl,mpc8540-dma-channel", "fsl,eloplus-dma-channel";
 122                         reg = <180 80>;
 123                         cell-index = <3>;
 124                         interrupt-parent = <&mpic>;
 125                         interrupts = <17 2>;
 126                 };
 127         };
 128
 129 Note on DMA channel compatible properties: The compatible property must say
 130 "fsl,elo-dma-channel" or "fsl,eloplus-dma-channel" to be used by the Elo DMA
 131 driver (fsldma).  Any DMA channel used by fsldma cannot be used by another
 132 DMA driver, such as the SSI sound drivers for the MPC8610.  Therefore, any DMA
 133 channel that should be used for another driver should not use
 134 "fsl,elo-dma-channel" or "fsl,eloplus-dma-channel".  For the SSI drivers, for
 135 example, the compatible property should be "fsl,ssi-dma-channel".  See ssi.txt
 136 for more information.