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dt-bindings: PCI: Convert generic host binding to DT schema
Convert the generic PCI host binding to DT schema. The derivative Juno, PLDA XpressRICH3-AXI, and Designware ECAM bindings all just vary in their compatible strings. The simplest way to convert those to schema is just add them into the common generic PCI host schema. The HiSilicon ECAM and Cavium ThunderX PEM bindings have an additional 'reg' entry, but are otherwise the same binding as well. Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Cc: Andrew Murray <andrew.murray@arm.com> Cc: Zhou Wang <wangzhou1@hisilicon.com> Cc: Will Deacon <will@kernel.org> Cc: David Daney <david.daney@cavium.com> Signed-off-by: Rob Herring <robh@kernel.org>
This commit is contained in:
Rob Herring
parent
919ba6e739
commit
e1ac611f57
@ -1,10 +0,0 @@
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* ARM Juno R1 PCIe interface
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This PCIe host controller is based on PLDA XpressRICH3-AXI IP
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and thus inherits all the common properties defined in plda,xpressrich3-axi.txt
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as well as the base properties defined in host-generic-pci.txt.
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Required properties:
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- compatible: "arm,juno-r1-pcie"
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- dma-coherent: The host controller bridges the AXI transactions into PCIe bus
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in a manner that makes the DMA operations to appear coherent to the CPUs.
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@ -1,42 +0,0 @@
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* Synopsys DesignWare PCIe root complex in ECAM shift mode
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In some cases, firmware may already have configured the Synopsys DesignWare
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PCIe controller in RC mode with static ATU window mappings that cover all
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config, MMIO and I/O spaces in a [mostly] ECAM compatible fashion.
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In this case, there is no need for the OS to perform any low level setup
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of clocks, PHYs or device registers, nor is there any reason for the driver
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to reconfigure ATU windows for config and/or IO space accesses at runtime.
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In cases where the IP was synthesized with a minimum ATU window size of
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64 KB, it cannot be supported by the generic ECAM driver, because it
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requires special config space accessors that filter accesses to device #1
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and beyond on the first bus.
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Required properties:
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- compatible: "marvell,armada8k-pcie-ecam" or
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"socionext,synquacer-pcie-ecam" or
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"snps,dw-pcie-ecam" (must be preceded by a more specific match)
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Please refer to the binding document of "pci-host-ecam-generic" in the
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file host-generic-pci.txt for a description of the remaining required
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and optional properties.
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Example:
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pcie1: pcie@7f000000 {
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compatible = "socionext,synquacer-pcie-ecam", "snps,dw-pcie-ecam";
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device_type = "pci";
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reg = <0x0 0x7f000000 0x0 0xf00000>;
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bus-range = <0x0 0xe>;
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#address-cells = <3>;
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#size-cells = <2>;
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ranges = <0x1000000 0x00 0x00010000 0x00 0x7ff00000 0x0 0x00010000>,
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<0x2000000 0x00 0x70000000 0x00 0x70000000 0x0 0x0f000000>,
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<0x3000000 0x3f 0x00000000 0x3f 0x00000000 0x1 0x00000000>;
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#interrupt-cells = <0x1>;
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interrupt-map-mask = <0x0 0x0 0x0 0x0>;
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interrupt-map = <0x0 0x0 0x0 0x0 &gic 0x0 0x0 0x0 182 0x4>;
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msi-map = <0x0 &its 0x0 0x10000>;
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dma-coherent;
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};
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@ -41,45 +41,3 @@ Hip05 Example (note that Hip06 is the same except compatible):
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0x0 0 0 3 &mbigen_pcie 3 12
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0x0 0 0 4 &mbigen_pcie 4 13>;
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};
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HiSilicon Hip06/Hip07 PCIe host bridge DT (almost-ECAM) description.
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Some BIOSes place the host controller in a mode where it is ECAM
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compliant for all devices other than the root complex. In such cases,
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the host controller should be described as below.
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The properties and their meanings are identical to those described in
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host-generic-pci.txt except as listed below.
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Properties of the host controller node that differ from
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host-generic-pci.txt:
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- compatible : Must be "hisilicon,hip06-pcie-ecam", or
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"hisilicon,hip07-pcie-ecam"
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- reg : Two entries: First the ECAM configuration space for any
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other bus underneath the root bus. Second, the base
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and size of the HiSilicon host bridge registers include
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the RC's own config space.
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Example:
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pcie0: pcie@a0090000 {
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compatible = "hisilicon,hip06-pcie-ecam";
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reg = <0 0xb0000000 0 0x2000000>, /* ECAM configuration space */
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<0 0xa0090000 0 0x10000>; /* host bridge registers */
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bus-range = <0 31>;
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msi-map = <0x0000 &its_dsa 0x0000 0x2000>;
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msi-map-mask = <0xffff>;
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#address-cells = <3>;
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#size-cells = <2>;
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device_type = "pci";
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dma-coherent;
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ranges = <0x02000000 0 0xb2000000 0x0 0xb2000000 0 0x5ff0000
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0x01000000 0 0 0 0xb7ff0000 0 0x10000>;
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#interrupt-cells = <1>;
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interrupt-map-mask = <0xf800 0 0 7>;
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interrupt-map = <0x0 0 0 1 &mbigen_pcie0 650 4
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0x0 0 0 2 &mbigen_pcie0 650 4
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0x0 0 0 3 &mbigen_pcie0 650 4
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0x0 0 0 4 &mbigen_pcie0 650 4>;
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};
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@ -1,101 +0,0 @@
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* Generic PCI host controller
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Firmware-initialised PCI host controllers and PCI emulations, such as the
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virtio-pci implementations found in kvmtool and other para-virtualised
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systems, do not require driver support for complexities such as regulator
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and clock management. In fact, the controller may not even require the
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configuration of a control interface by the operating system, instead
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presenting a set of fixed windows describing a subset of IO, Memory and
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Configuration Spaces.
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Such a controller can be described purely in terms of the standardized device
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tree bindings communicated in pci.txt:
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Properties of the host controller node:
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- compatible : Must be "pci-host-cam-generic" or "pci-host-ecam-generic"
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depending on the layout of configuration space (CAM vs
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ECAM respectively).
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- device_type : Must be "pci".
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- ranges : As described in IEEE Std 1275-1994, but must provide
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at least a definition of non-prefetchable memory. One
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or both of prefetchable Memory and IO Space may also
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be provided.
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- bus-range : Optional property (also described in IEEE Std 1275-1994)
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to indicate the range of bus numbers for this controller.
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If absent, defaults to <0 255> (i.e. all buses).
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- #address-cells : Must be 3.
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- #size-cells : Must be 2.
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- reg : The Configuration Space base address and size, as accessed
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from the parent bus. The base address corresponds to
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the first bus in the "bus-range" property. If no
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"bus-range" is specified, this will be bus 0 (the default).
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Properties of the /chosen node:
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- linux,pci-probe-only
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: Optional property which takes a single-cell argument.
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If '0', then Linux will assign devices in its usual manner,
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otherwise it will not try to assign devices and instead use
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them as they are configured already.
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Configuration Space is assumed to be memory-mapped (as opposed to being
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accessed via an ioport) and laid out with a direct correspondence to the
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geography of a PCI bus address by concatenating the various components to
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form an offset.
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For CAM, this 24-bit offset is:
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cfg_offset(bus, device, function, register) =
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bus << 16 | device << 11 | function << 8 | register
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While ECAM extends this by 4 bits to accommodate 4k of function space:
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cfg_offset(bus, device, function, register) =
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bus << 20 | device << 15 | function << 12 | register
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Interrupt mapping is exactly as described in `Open Firmware Recommended
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Practice: Interrupt Mapping' and requires the following properties:
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- #interrupt-cells : Must be 1
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- interrupt-map : <see aforementioned specification>
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- interrupt-map-mask : <see aforementioned specification>
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Example:
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pci {
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compatible = "pci-host-cam-generic"
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device_type = "pci";
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#address-cells = <3>;
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#size-cells = <2>;
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bus-range = <0x0 0x1>;
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// CPU_PHYSICAL(2) SIZE(2)
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reg = <0x0 0x40000000 0x0 0x1000000>;
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// BUS_ADDRESS(3) CPU_PHYSICAL(2) SIZE(2)
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ranges = <0x01000000 0x0 0x01000000 0x0 0x01000000 0x0 0x00010000>,
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<0x02000000 0x0 0x41000000 0x0 0x41000000 0x0 0x3f000000>;
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#interrupt-cells = <0x1>;
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// PCI_DEVICE(3) INT#(1) CONTROLLER(PHANDLE) CONTROLLER_DATA(3)
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interrupt-map = < 0x0 0x0 0x0 0x1 &gic 0x0 0x4 0x1
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0x800 0x0 0x0 0x1 &gic 0x0 0x5 0x1
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0x1000 0x0 0x0 0x1 &gic 0x0 0x6 0x1
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0x1800 0x0 0x0 0x1 &gic 0x0 0x7 0x1>;
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// PCI_DEVICE(3) INT#(1)
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interrupt-map-mask = <0xf800 0x0 0x0 0x7>;
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}
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172
Documentation/devicetree/bindings/pci/host-generic-pci.yaml
Normal file
172
Documentation/devicetree/bindings/pci/host-generic-pci.yaml
Normal file
@ -0,0 +1,172 @@
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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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%YAML 1.2
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---
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$id: http://devicetree.org/schemas/pci/host-generic-pci.yaml#
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$schema: http://devicetree.org/meta-schemas/core.yaml#
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title: Generic PCI host controller
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maintainers:
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- Will Deacon <will@kernel.org>
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description: |
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Firmware-initialised PCI host controllers and PCI emulations, such as the
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virtio-pci implementations found in kvmtool and other para-virtualised
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systems, do not require driver support for complexities such as regulator
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and clock management. In fact, the controller may not even require the
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configuration of a control interface by the operating system, instead
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presenting a set of fixed windows describing a subset of IO, Memory and
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Configuration Spaces.
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Configuration Space is assumed to be memory-mapped (as opposed to being
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accessed via an ioport) and laid out with a direct correspondence to the
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geography of a PCI bus address by concatenating the various components to
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form an offset.
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For CAM, this 24-bit offset is:
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cfg_offset(bus, device, function, register) =
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bus << 16 | device << 11 | function << 8 | register
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While ECAM extends this by 4 bits to accommodate 4k of function space:
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cfg_offset(bus, device, function, register) =
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bus << 20 | device << 15 | function << 12 | register
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properties:
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compatible:
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description: Depends on the layout of configuration space (CAM vs ECAM
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respectively). May also have more specific compatibles.
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oneOf:
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- description:
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PCIe host controller in Arm Juno based on PLDA XpressRICH3-AXI IP
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items:
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- const: arm,juno-r1-pcie
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- const: plda,xpressrich3-axi
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- const: pci-host-ecam-generic
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- description: |
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ThunderX PCI host controller for pass-1.x silicon
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Firmware-initialized PCI host controller to on-chip devices found on
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some Cavium ThunderX processors. These devices have ECAM-based config
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access, but the BARs are all at fixed addresses. We handle the fixed
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addresses by synthesizing Enhanced Allocation (EA) capabilities for
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these devices.
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const: cavium,pci-host-thunder-ecam
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- description:
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Cavium ThunderX PEM firmware-initialized PCIe host controller
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const: cavium,pci-host-thunder-pem
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- description:
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HiSilicon Hip06/Hip07 PCIe host bridge in almost-ECAM mode. Some
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firmware places the host controller in a mode where it is ECAM
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compliant for all devices other than the root complex.
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enum:
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- hisilicon,hip06-pcie-ecam
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- hisilicon,hip07-pcie-ecam
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- description: |
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In some cases, firmware may already have configured the Synopsys
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DesignWare PCIe controller in RC mode with static ATU window mappings
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that cover all config, MMIO and I/O spaces in a [mostly] ECAM
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compatible fashion. In this case, there is no need for the OS to
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perform any low level setup of clocks, PHYs or device registers, nor
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is there any reason for the driver to reconfigure ATU windows for
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config and/or IO space accesses at runtime.
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In cases where the IP was synthesized with a minimum ATU window size
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of 64 KB, it cannot be supported by the generic ECAM driver, because
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it requires special config space accessors that filter accesses to
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device #1 and beyond on the first bus.
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items:
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- enum:
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- marvell,armada8k-pcie-ecam
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- socionext,synquacer-pcie-ecam
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- const: snps,dw-pcie-ecam
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- description:
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CAM or ECAM compliant PCI host controllers without any quirks
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enum:
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- pci-host-cam-generic
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- pci-host-ecam-generic
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reg:
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description:
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The Configuration Space base address and size, as accessed from the parent
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bus. The base address corresponds to the first bus in the "bus-range"
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property. If no "bus-range" is specified, this will be bus 0 (the
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default). Some host controllers have a 2nd non-compliant address range,
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so 2 entries are allowed.
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minItems: 1
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maxItems: 2
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ranges:
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description:
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As described in IEEE Std 1275-1994, but must provide at least a
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definition of non-prefetchable memory. One or both of prefetchable Memory
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and IO Space may also be provided.
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minItems: 1
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maxItems: 3
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dma-coherent: true
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required:
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- compatible
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- reg
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- ranges
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allOf:
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- $ref: /schemas/pci/pci-bus.yaml#
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- if:
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properties:
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compatible:
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contains:
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const: arm,juno-r1-pcie
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then:
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required:
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- dma-coherent
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- if:
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properties:
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compatible:
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not:
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contains:
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enum:
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- cavium,pci-host-thunder-pem
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- hisilicon,hip06-pcie-ecam
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- hisilicon,hip07-pcie-ecam
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then:
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properties:
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reg:
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maxItems: 1
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examples:
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- |
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bus {
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#address-cells = <2>;
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#size-cells = <2>;
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pcie@40000000 {
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compatible = "pci-host-cam-generic";
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device_type = "pci";
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#address-cells = <3>;
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#size-cells = <2>;
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bus-range = <0x0 0x1>;
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// CPU_PHYSICAL(2) SIZE(2)
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reg = <0x0 0x40000000 0x0 0x1000000>;
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// BUS_ADDRESS(3) CPU_PHYSICAL(2) SIZE(2)
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ranges = <0x01000000 0x0 0x01000000 0x0 0x01000000 0x0 0x00010000>,
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<0x02000000 0x0 0x41000000 0x0 0x41000000 0x0 0x3f000000>;
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#interrupt-cells = <0x1>;
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// PCI_DEVICE(3) INT#(1) CONTROLLER(PHANDLE) CONTROLLER_DATA(3)
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interrupt-map = < 0x0 0x0 0x0 0x1 &gic 0x0 0x4 0x1>,
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< 0x800 0x0 0x0 0x1 &gic 0x0 0x5 0x1>,
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<0x1000 0x0 0x0 0x1 &gic 0x0 0x6 0x1>,
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<0x1800 0x0 0x0 0x1 &gic 0x0 0x7 0x1>;
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// PCI_DEVICE(3) INT#(1)
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interrupt-map-mask = <0xf800 0x0 0x0 0x7>;
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};
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};
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...
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@ -1,30 +0,0 @@
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* ThunderX PCI host controller for pass-1.x silicon
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Firmware-initialized PCI host controller to on-chip devices found on
|
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some Cavium ThunderX processors. These devices have ECAM-based config
|
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access, but the BARs are all at fixed addresses. We handle the fixed
|
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addresses by synthesizing Enhanced Allocation (EA) capabilities for
|
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these devices.
|
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|
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The properties and their meanings are identical to those described in
|
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host-generic-pci.txt except as listed below.
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Properties of the host controller node that differ from
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host-generic-pci.txt:
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- compatible : Must be "cavium,pci-host-thunder-ecam"
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Example:
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pcie@84b000000000 {
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compatible = "cavium,pci-host-thunder-ecam";
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device_type = "pci";
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msi-parent = <&its>;
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msi-map = <0 &its 0x30000 0x10000>;
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bus-range = <0 31>;
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#size-cells = <2>;
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#address-cells = <3>;
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#stream-id-cells = <1>;
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reg = <0x84b0 0x00000000 0 0x02000000>; /* Configuration space */
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ranges = <0x03000000 0x8180 0x00000000 0x8180 0x00000000 0x80 0x00000000>; /* mem ranges */
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};
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@ -1,43 +0,0 @@
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* ThunderX PEM PCIe host controller
|
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|
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Firmware-initialized PCI host controller found on some Cavium
|
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ThunderX processors.
|
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|
||||
The properties and their meanings are identical to those described in
|
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host-generic-pci.txt except as listed below.
|
||||
|
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Properties of the host controller node that differ from
|
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host-generic-pci.txt:
|
||||
|
||||
- compatible : Must be "cavium,pci-host-thunder-pem"
|
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|
||||
- reg : Two entries: First the configuration space for down
|
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stream devices base address and size, as accessed
|
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from the parent bus. Second, the register bank of
|
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the PEM device PCIe bridge.
|
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Example:
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pci@87e0,c2000000 {
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compatible = "cavium,pci-host-thunder-pem";
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device_type = "pci";
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msi-parent = <&its>;
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msi-map = <0 &its 0x10000 0x10000>;
|
||||
bus-range = <0x8f 0xc7>;
|
||||
#size-cells = <2>;
|
||||
#address-cells = <3>;
|
||||
|
||||
reg = <0x8880 0x8f000000 0x0 0x39000000>, /* Configuration space */
|
||||
<0x87e0 0xc2000000 0x0 0x00010000>; /* PEM space */
|
||||
ranges = <0x01000000 0x00 0x00020000 0x88b0 0x00020000 0x00 0x00010000>, /* I/O */
|
||||
<0x03000000 0x00 0x10000000 0x8890 0x10000000 0x0f 0xf0000000>, /* mem64 */
|
||||
<0x43000000 0x10 0x00000000 0x88a0 0x00000000 0x10 0x00000000>, /* mem64-pref */
|
||||
<0x03000000 0x87e0 0xc2f00000 0x87e0 0xc2000000 0x00 0x00100000>; /* mem64 PEM BAR4 */
|
||||
|
||||
#interrupt-cells = <1>;
|
||||
interrupt-map-mask = <0 0 0 7>;
|
||||
interrupt-map = <0 0 0 1 &gic0 0 0 0 24 4>, /* INTA */
|
||||
<0 0 0 2 &gic0 0 0 0 25 4>, /* INTB */
|
||||
<0 0 0 3 &gic0 0 0 0 26 4>, /* INTC */
|
||||
<0 0 0 4 &gic0 0 0 0 27 4>; /* INTD */
|
||||
};
|
||||
@ -1,12 +0,0 @@
|
||||
* PLDA XpressRICH3-AXI host controller
|
||||
|
||||
The PLDA XpressRICH3-AXI host controller can be configured in a manner that
|
||||
makes it compliant with the SBSA[1] standard published by ARM Ltd. For those
|
||||
scenarios, the host-generic-pci.txt bindings apply with the following additions
|
||||
to the compatible property:
|
||||
|
||||
Required properties:
|
||||
- compatible: should contain "plda,xpressrich3-axi" to identify the IP used.
|
||||
|
||||
|
||||
[1] http://infocenter.arm.com/help/topic/com.arm.doc.den0029a/
|
||||
@ -12613,7 +12613,7 @@ M: Will Deacon <will@kernel.org>
|
||||
L: linux-pci@vger.kernel.org
|
||||
L: linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
|
||||
S: Maintained
|
||||
F: Documentation/devicetree/bindings/pci/host-generic-pci.txt
|
||||
F: Documentation/devicetree/bindings/pci/host-generic-pci.yaml
|
||||
F: drivers/pci/controller/pci-host-common.c
|
||||
F: drivers/pci/controller/pci-host-generic.c
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user