191 lines
4.7 KiB
Plaintext
191 lines
4.7 KiB
Plaintext
* Mediatek/Ralink RT3883 PCI controller
|
|
|
|
1) Main node
|
|
|
|
Required properties:
|
|
|
|
- compatible: must be "ralink,rt3883-pci"
|
|
|
|
- reg: specifies the physical base address of the controller and
|
|
the length of the memory mapped region.
|
|
|
|
- #address-cells: specifies the number of cells needed to encode an
|
|
address. The value must be 1.
|
|
|
|
- #size-cells: specifies the number of cells used to represent the size
|
|
of an address. The value must be 1.
|
|
|
|
- ranges: specifies the translation between child address space and parent
|
|
address space
|
|
|
|
Optional properties:
|
|
|
|
- status: indicates the operational status of the device.
|
|
Value must be either "disabled" or "okay".
|
|
|
|
2) Child nodes
|
|
|
|
The main node must have two child nodes which describes the built-in
|
|
interrupt controller and the PCI host bridge.
|
|
|
|
a) Interrupt controller:
|
|
|
|
Required properties:
|
|
|
|
- interrupt-controller: identifies the node as an interrupt controller
|
|
|
|
- #address-cells: specifies the number of cells needed to encode an
|
|
address. The value must be 0. As such, 'interrupt-map' nodes do not
|
|
have to specify a parent unit address.
|
|
|
|
- #interrupt-cells: specifies the number of cells needed to encode an
|
|
interrupt source. The value must be 1.
|
|
|
|
- interrupt-parent: the phandle for the interrupt controller that
|
|
services interrupts for this device.
|
|
|
|
- interrupts: specifies the interrupt source of the parent interrupt
|
|
controller. The format of the interrupt specifier depends on the
|
|
parent interrupt controller.
|
|
|
|
b) PCI host bridge:
|
|
|
|
Required properties:
|
|
|
|
- #address-cells: specifies the number of cells needed to encode an
|
|
address. The value must be 0.
|
|
|
|
- #size-cells: specifies the number of cells used to represent the size
|
|
of an address. The value must be 2.
|
|
|
|
- #interrupt-cells: specifies the number of cells needed to encode an
|
|
interrupt source. The value must be 1.
|
|
|
|
- device_type: must be "pci"
|
|
|
|
- bus-range: PCI bus numbers covered
|
|
|
|
- ranges: specifies the ranges for the PCI memory and I/O regions
|
|
|
|
- interrupt-map-mask,
|
|
- interrupt-map: standard PCI properties to define the mapping of the
|
|
PCI interface to interrupt numbers.
|
|
|
|
The PCI host bridge node migh have additional sub-nodes representing
|
|
the onboard PCI devices/PCI slots. Each such sub-node must have the
|
|
following mandatory properties:
|
|
|
|
- reg: used only for interrupt mapping, so only the first four bytes
|
|
are used to refer to the correct bus number and device number.
|
|
|
|
- device_type: must be "pci"
|
|
|
|
If a given sub-node represents a PCI bridge it must have following
|
|
mandatory properties as well:
|
|
|
|
- #address-cells: must be set to <3>
|
|
|
|
- #size-cells: must set to <2>
|
|
|
|
- #interrupt-cells: must be set to <1>
|
|
|
|
- interrupt-map-mask,
|
|
- interrupt-map: standard PCI properties to define the mapping of the
|
|
PCI interface to interrupt numbers.
|
|
|
|
Besides the required properties the sub-nodes may have these optional
|
|
properties:
|
|
|
|
- status: indicates the operational status of the sub-node.
|
|
Value must be either "disabled" or "okay".
|
|
|
|
3) Example:
|
|
|
|
a) SoC specific dtsi file:
|
|
|
|
pci@10140000 {
|
|
compatible = "ralink,rt3883-pci";
|
|
reg = <0x10140000 0x20000>;
|
|
#address-cells = <1>;
|
|
#size-cells = <1>;
|
|
ranges; /* direct mapping */
|
|
|
|
status = "disabled";
|
|
|
|
pciintc: interrupt-controller {
|
|
interrupt-controller;
|
|
#address-cells = <0>;
|
|
#interrupt-cells = <1>;
|
|
|
|
interrupt-parent = <&cpuintc>;
|
|
interrupts = <4>;
|
|
};
|
|
|
|
host-bridge {
|
|
#address-cells = <3>;
|
|
#size-cells = <2>;
|
|
#interrupt-cells = <1>;
|
|
|
|
device_type = "pci";
|
|
|
|
bus-range = <0 255>;
|
|
ranges = <
|
|
0x02000000 0 0x00000000 0x20000000 0 0x10000000 /* pci memory */
|
|
0x01000000 0 0x00000000 0x10160000 0 0x00010000 /* io space */
|
|
>;
|
|
|
|
interrupt-map-mask = <0xf800 0 0 7>;
|
|
interrupt-map = <
|
|
/* IDSEL 17 */
|
|
0x8800 0 0 1 &pciintc 18
|
|
0x8800 0 0 2 &pciintc 18
|
|
0x8800 0 0 3 &pciintc 18
|
|
0x8800 0 0 4 &pciintc 18
|
|
/* IDSEL 18 */
|
|
0x9000 0 0 1 &pciintc 19
|
|
0x9000 0 0 2 &pciintc 19
|
|
0x9000 0 0 3 &pciintc 19
|
|
0x9000 0 0 4 &pciintc 19
|
|
>;
|
|
|
|
pci-bridge@1 {
|
|
reg = <0x0800 0 0 0 0>;
|
|
device_type = "pci";
|
|
#interrupt-cells = <1>;
|
|
#address-cells = <3>;
|
|
#size-cells = <2>;
|
|
|
|
interrupt-map-mask = <0x0 0 0 0>;
|
|
interrupt-map = <0x0 0 0 0 &pciintc 20>;
|
|
|
|
status = "disabled";
|
|
};
|
|
|
|
pci-slot@17 {
|
|
reg = <0x8800 0 0 0 0>;
|
|
device_type = "pci";
|
|
|
|
status = "disabled";
|
|
};
|
|
|
|
pci-slot@18 {
|
|
reg = <0x9000 0 0 0 0>;
|
|
device_type = "pci";
|
|
|
|
status = "disabled";
|
|
};
|
|
};
|
|
};
|
|
|
|
b) Board specific dts file:
|
|
|
|
pci@10140000 {
|
|
status = "okay";
|
|
|
|
host-bridge {
|
|
pci-bridge@1 {
|
|
status = "okay";
|
|
};
|
|
};
|
|
};
|