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 = <0x82a8 4>;
  39                 ranges = <0 0x8100 0x1a4>;
  40                 interrupt-parent = <&ipic>;
  41                 interrupts = <71 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 0x80>;
  47                         interrupt-parent = <&ipic>;
  48                         interrupts = <71 8>;
  49                 };
  50                 dma-channel@80 {
  51                         compatible = "fsl,mpc8349-dma-channel", "fsl,elo-dma-channel";
  52                         cell-index = <1>;
  53                         reg = <0x80 0x80>;
  54                         interrupt-parent = <&ipic>;
  55                         interrupts = <71 8>;
  56                 };
  57                 dma-channel@100 {
  58                         compatible = "fsl,mpc8349-dma-channel", "fsl,elo-dma-channel";
  59                         cell-index = <2>;
  60                         reg = <0x100 0x80>;
  61                         interrupt-parent = <&ipic>;
  62                         interrupts = <71 8>;
  63                 };
  64                 dma-channel@180 {
  65                         compatible = "fsl,mpc8349-dma-channel", "fsl,elo-dma-channel";
  66                         cell-index = <3>;
  67                         reg = <0x180 0x80>;
  68                         interrupt-parent = <&ipic>;
  69                         interrupts = <71 8>;
  70                 };
  71         };
  72
  73 * Freescale 85xx/86xx DMA Controller
  74
  75 Freescale PowerPC 85xx/86xx have on chip general purpose DMA controllers.
  76
  77 Required properties:
  78
  79 - compatible        : compatible list, contains 2 entries, first is
  80                  "fsl,CHIP-dma", where CHIP is the processor
  81                  (mpc8540, mpc8540, etc.) and the second is
  82                  "fsl,eloplus-dma"
  83 - reg               : <registers mapping for DMA general status reg>
  84 - cell-index        : controller index.  0 for controller @ 0x21000,
  85                                          1 for controller @ 0xc000
  86 - ranges                : Should be defined as specified in 1) to describe the
  87                   DMA controller channels.
  88
  89 - DMA channel nodes:
  90         - compatible        : compatible list, contains 2 entries, first is
  91                          "fsl,CHIP-dma-channel", where CHIP is the processor
  92                          (mpc8540, mpc8560, etc.) and the second is
  93                          "fsl,eloplus-dma-channel". However, see note below.
  94         - cell-index        : dma channel index starts at 0.
  95         - reg               : <registers mapping for channel>
  96         - interrupts        : <interrupt mapping for DMA channel IRQ>
  97         - interrupt-parent  : optional, if needed for interrupt mapping
  98
  99 Example:
 100         dma@21300 {
 101                 #address-cells = <1>;
 102                 #size-cells = <1>;
 103                 compatible = "fsl,mpc8540-dma", "fsl,eloplus-dma";
 104                 reg = <0x21300 4>;
 105                 ranges = <0 0x21100 0x200>;
 106                 cell-index = <0>;
 107                 dma-channel@0 {
 108                         compatible = "fsl,mpc8540-dma-channel", "fsl,eloplus-dma-channel";
 109                         reg = <0 0x80>;
 110                         cell-index = <0>;
 111                         interrupt-parent = <&mpic>;
 112                         interrupts = <20 2>;
 113                 };
 114                 dma-channel@80 {
 115                         compatible = "fsl,mpc8540-dma-channel", "fsl,eloplus-dma-channel";
 116                         reg = <0x80 0x80>;
 117                         cell-index = <1>;
 118                         interrupt-parent = <&mpic>;
 119                         interrupts = <21 2>;
 120                 };
 121                 dma-channel@100 {
 122                         compatible = "fsl,mpc8540-dma-channel", "fsl,eloplus-dma-channel";
 123                         reg = <0x100 0x80>;
 124                         cell-index = <2>;
 125                         interrupt-parent = <&mpic>;
 126                         interrupts = <22 2>;
 127                 };
 128                 dma-channel@180 {
 129                         compatible = "fsl,mpc8540-dma-channel", "fsl,eloplus-dma-channel";
 130                         reg = <0x180 0x80>;
 131                         cell-index = <3>;
 132                         interrupt-parent = <&mpic>;
 133                         interrupts = <23 2>;
 134                 };
 135         };
 136
 137 Note on DMA channel compatible properties: The compatible property must say
 138 "fsl,elo-dma-channel" or "fsl,eloplus-dma-channel" to be used by the Elo DMA
 139 driver (fsldma).  Any DMA channel used by fsldma cannot be used by another
 140 DMA driver, such as the SSI sound drivers for the MPC8610.  Therefore, any DMA
 141 channel that should be used for another driver should not use
 142 "fsl,elo-dma-channel" or "fsl,eloplus-dma-channel".  For the SSI drivers, for
 143 example, the compatible property should be "fsl,ssi-dma-channel".  See ssi.txt
 144 for more information.