PPC440SPe DMA/XOR (DMA Controller and XOR Accelerator)

Device nodes needed for operation of the ppc440spe-adma driver
are specified hereby. These are I2O/DMA, DMA and XOR nodes
for DMA engines and Memory Queue Module node. The latter is used
by ADMA driver for configuration of RAID-6 H/W capabilities of
the PPC440SPe. In addition to the nodes and properties described
below, the ranges property of PLB node must specify ranges for
DMA devices.

 i) The I2O node

 Required properties:

 - compatible		: "ibm,i2o-440spe";
 - reg			: <registers mapping>
 - dcr-reg		: <DCR registers range>

 Example:

	I2O: i2o@400100000 {
		compatible = "ibm,i2o-440spe";
		reg = <0x00000004 0x00100000 0x100>;
		dcr-reg = <0x060 0x020>;
	};


 ii) The DMA node

 Required properties:

 - compatible		: "ibm,dma-440spe";
 - cell-index		: 1 cell, hardware index of the DMA engine
			  (typically 0x0 and 0x1 for DMA0 and DMA1)
 - reg			: <registers mapping>
 - dcr-reg		: <DCR registers range>
 - interrupts		: <interrupt mapping for DMA0/1 interrupts sources:
			   2 sources: DMAx CS FIFO Needs Service IRQ (on UIC0)
			   and DMA Error IRQ (on UIC1). The latter is common
			   for both DMA engines>.
 - interrupt-parent	: needed for interrupt mapping

 Example:

	DMA0: dma0@400100100 {
		compatible = "ibm,dma-440spe";
		cell-index = <0>;
		reg = <0x00000004 0x00100100 0x100>;
		dcr-reg = <0x060 0x020>;
		interrupt-parent = <&DMA0>;
		interrupts = <0 1>;
		#interrupt-cells = <1>;
		#address-cells = <0>;
		#size-cells = <0>;
		interrupt-map = <
			0 &UIC0 0x14 4
			1 &UIC1 0x16 4>;
	};


 iii) XOR Accelerator node

 Required properties:

 - compatible		: "amcc,xor-accelerator";
 - reg			: <registers mapping>
 - interrupts		: <interrupt mapping for XOR interrupt source>
 - interrupt-parent	: for interrupt mapping

 Example:

	xor-accel@400200000 {
		compatible = "amcc,xor-accelerator";
		reg = <0x00000004 0x00200000 0x400>;
		interrupt-parent = <&UIC1>;
		interrupts = <0x1f 4>;
	};


 iv) Memory Queue Module node

 Required properties:

 - compatible		: "ibm,mq-440spe";
 - dcr-reg		: <DCR registers range>

 Example:

	MQ0: mq {
		compatible = "ibm,mq-440spe";
		dcr-reg = <0x040 0x020>;
	};