Based on kernel version 4.16.1. Page generated on 2018-04-09 11:52 EST.
1 * Synopsys DesignWare PCIe root complex in ECAM shift mode 2 3 In some cases, firmware may already have configured the Synopsys DesignWare 4 PCIe controller in RC mode with static ATU window mappings that cover all 5 config, MMIO and I/O spaces in a [mostly] ECAM compatible fashion. 6 In this case, there is no need for the OS to perform any low level setup 7 of clocks, PHYs or device registers, nor is there any reason for the driver 8 to reconfigure ATU windows for config and/or IO space accesses at runtime. 9 10 In cases where the IP was synthesized with a minimum ATU window size of 11 64 KB, it cannot be supported by the generic ECAM driver, because it 12 requires special config space accessors that filter accesses to device #1 13 and beyond on the first bus. 14 15 Required properties: 16 - compatible: "marvell,armada8k-pcie-ecam" or 17 "socionext,synquacer-pcie-ecam" or 18 "snps,dw-pcie-ecam" (must be preceded by a more specific match) 19 20 Please refer to the binding document of "pci-host-ecam-generic" in the 21 file host-generic-pci.txt for a description of the remaining required 22 and optional properties. 23 24 Example: 25 26 pcie1: pcie@7f000000 { 27 compatible = "socionext,synquacer-pcie-ecam", "snps,dw-pcie-ecam"; 28 device_type = "pci"; 29 reg = <0x0 0x7f000000 0x0 0xf00000>; 30 bus-range = <0x0 0xe>; 31 #address-cells = <3>; 32 #size-cells = <2>; 33 ranges = <0x1000000 0x00 0x00010000 0x00 0x7ff00000 0x0 0x00010000>, 34 <0x2000000 0x00 0x70000000 0x00 0x70000000 0x0 0x0f000000>, 35 <0x3000000 0x3f 0x00000000 0x3f 0x00000000 0x1 0x00000000>; 36 37 #interrupt-cells = <0x1>; 38 interrupt-map-mask = <0x0 0x0 0x0 0x0>; 39 interrupt-map = <0x0 0x0 0x0 0x0 &gic 0x0 0x0 0x0 182 0x4>; 40 msi-map = <0x0 &its 0x0 0x10000>; 41 dma-coherent; 42 };