mirror of https://gitee.com/openkylin/linux.git
43 lines
1.8 KiB
Plaintext
43 lines
1.8 KiB
Plaintext
* Synopsys DesignWare PCIe root complex in ECAM shift mode
|
|
|
|
In some cases, firmware may already have configured the Synopsys DesignWare
|
|
PCIe controller in RC mode with static ATU window mappings that cover all
|
|
config, MMIO and I/O spaces in a [mostly] ECAM compatible fashion.
|
|
In this case, there is no need for the OS to perform any low level setup
|
|
of clocks, PHYs or device registers, nor is there any reason for the driver
|
|
to reconfigure ATU windows for config and/or IO space accesses at runtime.
|
|
|
|
In cases where the IP was synthesized with a minimum ATU window size of
|
|
64 KB, it cannot be supported by the generic ECAM driver, because it
|
|
requires special config space accessors that filter accesses to device #1
|
|
and beyond on the first bus.
|
|
|
|
Required properties:
|
|
- compatible: "marvell,armada8k-pcie-ecam" or
|
|
"socionext,synquacer-pcie-ecam" or
|
|
"snps,dw-pcie-ecam" (must be preceded by a more specific match)
|
|
|
|
Please refer to the binding document of "pci-host-ecam-generic" in the
|
|
file host-generic-pci.txt for a description of the remaining required
|
|
and optional properties.
|
|
|
|
Example:
|
|
|
|
pcie1: pcie@7f000000 {
|
|
compatible = "socionext,synquacer-pcie-ecam", "snps,dw-pcie-ecam";
|
|
device_type = "pci";
|
|
reg = <0x0 0x7f000000 0x0 0xf00000>;
|
|
bus-range = <0x0 0xe>;
|
|
#address-cells = <3>;
|
|
#size-cells = <2>;
|
|
ranges = <0x1000000 0x00 0x00010000 0x00 0x7ff00000 0x0 0x00010000>,
|
|
<0x2000000 0x00 0x70000000 0x00 0x70000000 0x0 0x0f000000>,
|
|
<0x3000000 0x3f 0x00000000 0x3f 0x00000000 0x1 0x00000000>;
|
|
|
|
#interrupt-cells = <0x1>;
|
|
interrupt-map-mask = <0x0 0x0 0x0 0x0>;
|
|
interrupt-map = <0x0 0x0 0x0 0x0 &gic 0x0 0x0 0x0 182 0x4>;
|
|
msi-map = <0x0 &its 0x0 0x10000>;
|
|
dma-coherent;
|
|
};
|