aboutsummaryrefslogtreecommitdiff
path: root/Documentation/devicetree/bindings/powerpc/fsl/dma.txt
diff options
context:
space:
mode:
Diffstat (limited to 'Documentation/devicetree/bindings/powerpc/fsl/dma.txt')
-rw-r--r--Documentation/devicetree/bindings/powerpc/fsl/dma.txt144
1 files changed, 144 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/powerpc/fsl/dma.txt b/Documentation/devicetree/bindings/powerpc/fsl/dma.txt
new file mode 100644
index 00000000..2a4b4bce
--- /dev/null
+++ b/Documentation/devicetree/bindings/powerpc/fsl/dma.txt
@@ -0,0 +1,144 @@
+* 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 : <registers mapping for DMA general status 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 mapping for DMA IRQ>
+- 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 : <interrupt mapping for DMA channel IRQ>
+ (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>;
+ interrupt-parent = <&ipic>;
+ interrupts = <71 8>;
+ };
+ dma-channel@80 {
+ compatible = "fsl,mpc8349-dma-channel", "fsl,elo-dma-channel";
+ cell-index = <1>;
+ reg = <0x80 0x80>;
+ interrupt-parent = <&ipic>;
+ interrupts = <71 8>;
+ };
+ dma-channel@100 {
+ compatible = "fsl,mpc8349-dma-channel", "fsl,elo-dma-channel";
+ cell-index = <2>;
+ reg = <0x100 0x80>;
+ interrupt-parent = <&ipic>;
+ interrupts = <71 8>;
+ };
+ dma-channel@180 {
+ compatible = "fsl,mpc8349-dma-channel", "fsl,elo-dma-channel";
+ cell-index = <3>;
+ reg = <0x180 0x80>;
+ interrupt-parent = <&ipic>;
+ interrupts = <71 8>;
+ };
+ };
+
+* 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 : <registers mapping for DMA general status 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.