94 lines
2.1 KiB
Plaintext
94 lines
2.1 KiB
Plaintext
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>;
|
|
};
|
|
|