1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
|
NXP Layerscape SoC qDMA Controller
==================================
This device follows the generic DMA bindings defined in dma/dma.txt.
Required properties:
- compatible: Must be one of
"fsl,ls1021a-qdma": for LS1021A Board
"fsl,ls1028a-qdma": for LS1028A Board
"fsl,ls1043a-qdma": for ls1043A Board
"fsl,ls1046a-qdma": for ls1046A Board
- reg: Should contain the register's base address and length.
- interrupts: Should contain a reference to the interrupt used by this
device.
- interrupt-names: Should contain interrupt names:
"qdma-queue0": the block0 interrupt
"qdma-queue1": the block1 interrupt
"qdma-queue2": the block2 interrupt
"qdma-queue3": the block3 interrupt
"qdma-error": the error interrupt
- fsl,dma-queues: Should contain number of queues supported.
- dma-channels: Number of DMA channels supported
- block-number: the virtual block number
- block-offset: the offset of different virtual block
- status-sizes: status queue size of per virtual block
- queue-sizes: command queue size of per virtual block, the size number
based on queues
Optional properties:
- dma-channels: Number of DMA channels supported by the controller.
- big-endian: If present registers and hardware scatter/gather descriptors
of the qDMA are implemented in big endian mode, otherwise in little
mode.
Examples:
qdma: dma-controller@8390000 {
compatible = "fsl,ls1021a-qdma";
reg = <0x0 0x8388000 0x0 0x1000>, /* Controller regs */
<0x0 0x8389000 0x0 0x1000>, /* Status regs */
<0x0 0x838a000 0x0 0x2000>; /* Block regs */
interrupts = <GIC_SPI 185 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 76 IRQ_TYPE_LEVEL_HIGH>,
<GIC_SPI 77 IRQ_TYPE_LEVEL_HIGH>;
interrupt-names = "qdma-error",
"qdma-queue0", "qdma-queue1";
dma-channels = <8>;
block-number = <2>;
block-offset = <0x1000>;
fsl,dma-queues = <2>;
status-sizes = <64>;
queue-sizes = <64 64>;
big-endian;
};
DMA clients must use the format described in dma/dma.txt file.
|
