Add bindings for the RISC-V IOMMU device drivers. Co-developed-by: Anup Patel <apatel@xxxxxxxxxxxxxxxx> Signed-off-by: Anup Patel <apatel@xxxxxxxxxxxxxxxx> Signed-off-by: Tomasz Jeznach <tjeznach@xxxxxxxxxxxx> --- .../bindings/iommu/riscv,iommu.yaml | 149 ++++++++++++++++++ MAINTAINERS | 7 + 2 files changed, 156 insertions(+) create mode 100644 Documentation/devicetree/bindings/iommu/riscv,iommu.yaml diff --git a/Documentation/devicetree/bindings/iommu/riscv,iommu.yaml b/Documentation/devicetree/bindings/iommu/riscv,iommu.yaml new file mode 100644 index 000000000000..d6522ddd43fa --- /dev/null +++ b/Documentation/devicetree/bindings/iommu/riscv,iommu.yaml @@ -0,0 +1,149 @@ +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) +%YAML 1.2 +--- +$id: http://devicetree.org/schemas/iommu/riscv,iommu.yaml# +$schema: http://devicetree.org/meta-schemas/core.yaml# + +title: RISC-V IOMMU Architecture Implementation + +maintainers: + - Tomasz Jeznach <tjeznach@xxxxxxxxxxxx> + +description: |+ + The RISC-V IOMMU provides memory address translation and isolation for + input and output devices, supporting per-device translation context, + shared process address spaces including the ATS and PRI components of + the PCIe specification, two stage address translation and MSI remapping. + It supports identical translation table format to the RISC-V address + translation tables with page level access and protection attributes. + Hardware uses in-memory command and fault reporting queues with wired + interrupt or MSI notifications. + + Visit https://github.com/riscv-non-isa/riscv-iommu for more details. + + For information on assigning RISC-V IOMMU to its peripheral devices, + see generic IOMMU bindings. + +properties: + # For PCIe IOMMU hardware compatible property should contain the vendor + # and device ID according to the PCI Bus Binding specification. + # Since PCI provides built-in identification methods, compatible is not + # actually required. For non-PCIe hardware implementations 'riscv,iommu' + # should be specified along with 'reg' property providing MMIO location. + compatible: + oneOf: + - items: + - const: riscv,pci-iommu + - const: pci1efd,edf1 + - items: + - const: pci1efd,edf1 + - items: + - const: riscv,iommu + + reg: + maxItems: 1 + description: + For non-PCI devices this represents base address and size of for the + IOMMU memory mapped registers interface. + For PCI IOMMU hardware implementation this should represent an address + of the IOMMU, as defined in the PCI Bus Binding reference. The reg + property is a five-cell address encoded as (phys.hi phys.mid phys.lo + size.hi size.lo), where phys.hi should contain the device's BDF as + 0b00000000 bbbbbbbb dddddfff 00000000. The other cells should be zero. + + '#iommu-cells': + const: 1 + description: + Has to be one. The single cell describes the requester id emitted + by a master to the IOMMU. + + interrupts: + minItems: 1 + maxItems: 4 + description: + Wired interrupt vectors available for RISC-V IOMMU to notify the + RISC-V HARTS. The cause to interrupt vector is software defined + using IVEC IOMMU register. + + msi-parent: true + + power-domains: + maxItems: 1 + +required: + - compatible + - reg + - '#iommu-cells' + +additionalProperties: false + +examples: + - |+ + /* Example 1 (IOMMU device with wired interrupts) */ + #include <dt-bindings/interrupt-controller/irq.h> + + iommu1: iommu@1bccd000 { + compatible = "riscv,iommu"; + reg = <0x1bccd000 0x1000>; + interrupt-parent = <&aplic_smode>; + interrupts = <32 IRQ_TYPE_LEVEL_HIGH>, + <33 IRQ_TYPE_LEVEL_HIGH>, + <34 IRQ_TYPE_LEVEL_HIGH>, + <35 IRQ_TYPE_LEVEL_HIGH>; + #iommu-cells = <1>; + }; + + /* Device with two IOMMU device IDs, 0 and 7 */ + master1 { + iommus = <&iommu1 0>, <&iommu1 7>; + }; + + - |+ + /* Example 2 (IOMMU device with shared wired interrupt) */ + #include <dt-bindings/interrupt-controller/irq.h> + + iommu2: iommu@1bccd000 { + compatible = "riscv,iommu"; + reg = <0x1bccd000 0x1000>; + interrupt-parent = <&aplic_smode>; + interrupts = <32 IRQ_TYPE_LEVEL_HIGH>; + #iommu-cells = <1>; + }; + + - |+ + /* Example 3 (IOMMU device with MSIs) */ + iommu3: iommu@1bcdd000 { + compatible = "riscv,iommu"; + reg = <0x1bccd000 0x1000>; + msi-parent = <&imsics_smode>; + #iommu-cells = <1>; + }; + + - |+ + /* Example 4 (IOMMU PCIe device with MSIs) */ + bus { + #address-cells = <2>; + #size-cells = <2>; + + pcie@30000000 { + device_type = "pci"; + #address-cells = <3>; + #size-cells = <2>; + reg = <0x0 0x30000000 0x0 0x1000000>; + ranges = <0x02000000 0x0 0x41000000 0x0 0x41000000 0x0 0x0f000000>; + + /* + * The IOMMU manages all functions in this PCI domain except + * itself. Omit BDF 00:01.0. + */ + iommu-map = <0x0 &iommu0 0x0 0x8 + 0x9 &iommu0 0x9 0xfff7>; + + /* The IOMMU programming interface uses slot 00:01.0 */ + iommu0: iommu@1,0 { + compatible = "pci1efd,edf1"; + reg = <0x800 0 0 0 0>; + #iommu-cells = <1>; + }; + }; + }; diff --git a/MAINTAINERS b/MAINTAINERS index c23fda1aa1f0..2657f9eae84c 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -18966,6 +18966,13 @@ F: arch/riscv/ N: riscv K: riscv +RISC-V IOMMU +M: Tomasz Jeznach <tjeznach@xxxxxxxxxxxx> +L: iommu@xxxxxxxxxxxxxxx +L: linux-riscv@xxxxxxxxxxxxxxxxxxx +S: Maintained +F: Documentation/devicetree/bindings/iommu/riscv,iommu.yaml + RISC-V MICROCHIP FPGA SUPPORT M: Conor Dooley <conor.dooley@xxxxxxxxxxxxx> M: Daire McNamara <daire.mcnamara@xxxxxxxxxxxxx> -- 2.34.1
