Based on kernel version 2.6.37. Page generated on 2011-03-22 21:57 EST.
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.