xref: /kernel/linux/linux-5.10/Documentation/devicetree/bindings/powerpc/fsl/pamu.txt

Freescale Peripheral Management Access Unit (PAMU) Device Tree Binding

DESCRIPTION

The PAMU is an I/O MMU that provides device-to-memory access control and
address translation capabilities.

Required properties:

- compatible	: <string>
		  First entry is a version-specific string, such as
		  "fsl,pamu-v1.0".  The second is "fsl,pamu".
- ranges	: <prop-encoded-array>
		  A standard property. Utilized to describe the memory mapped
		  I/O space utilized by the controller.  The size should
		  be set to the total size of the register space of all
		  physically present PAMU controllers.  For example, for
		  PAMU v1.0, on an SOC that has five PAMU devices, the size
		  is 0x5000.
- interrupts	: <prop-encoded-array>
		  Interrupt mappings.  The first tuple is the normal PAMU
		  interrupt, used for reporting access violations.  The second
		  is for PAMU hardware errors, such as PAMU operation errors
		  and ECC errors.
- #address-cells: <u32>
		  A standard property.
- #size-cells	: <u32>
		  A standard property.

Optional properties:
- reg		: <prop-encoded-array>
		  A standard property.   It represents the CCSR registers of
		  all child PAMUs combined.  Include it to provide support
		  for legacy drivers.
- fsl,portid-mapping : <u32>
		  The Coherency Subdomain ID Port Mapping Registers and
		  Snoop ID Port Mapping registers, which are part of the
		  CoreNet Coherency fabric (CCF), provide a CoreNet
		  Coherency Subdomain ID/CoreNet Snoop ID to pamu mapping
		  functions.  Certain bits from these registers should be
		  set if PAMUs should be snooped.  This property defines
		  a bitmask which selects the bits that should be set if
		  PAMUs should be snooped.

Child nodes:

Each child node represents one PAMU controller.  Each SOC device that is
connected to a specific PAMU device should have a "fsl,pamu-phandle" property
that links to the corresponding specific child PAMU controller.

- reg		: <prop-encoded-array>
		  A standard property.  Specifies the physical address and
		  length (relative to the parent 'ranges' property) of this
		  PAMU controller's configuration registers.  The size should
		  be set to the size of this PAMU controllers's register space.
		  For PAMU v1.0, this size is 0x1000.
- fsl,primary-cache-geometry
		: <prop-encoded-array>
		  Two cells that specify the geometry of the primary PAMU
		  cache.  The first is the number of cache lines, and the
		  second is the number of "ways".  For direct-mapped caches,
		  specify a value of 1.
- fsl,secondary-cache-geometry
		: <prop-encoded-array>
		  Two cells that specify the geometry of the secondary PAMU
		  cache.  The first is the number of cache lines, and the
		  second is the number of "ways".  For direct-mapped caches,
		  specify a value of 1.

Device nodes:

Devices that have LIODNs need to specify links to the parent PAMU controller
(the actual PAMU controller that this device is connected to) and a pointer to
the LIODN register, if applicable.

- fsl,iommu-parent
		: <phandle>
		Phandle to the single, specific PAMU controller node to which
		this device is connect.  The PAMU topology is represented in
		the device tree to assist code that dynamically determines the
		best LIODN values to minimize PAMU cache thrashing.

- fsl,liodn-reg : <prop-encoded-array>
		  Two cells that specify the location of the LIODN register
		  for this device.  Required for devices that have a single
		  LIODN.  The first cell is a phandle to a node that contains
		  the registers where the LIODN is to be set.  The second is
		  the offset from the first "reg" resource of the node where
		  the specific LIODN register is located.


Example:

	iommu@20000 {
		compatible = "fsl,pamu-v1.0", "fsl,pamu";
		reg = <0x20000 0x5000>;
		ranges = <0 0x20000 0x5000>;
		fsl,portid-mapping = <0xf80000>;
		#address-cells = <1>;
		#size-cells = <1>;
		interrupts = <
			24 2 0 0
			16 2 1 30>;

		pamu0: pamu@0 {
			reg = <0 0x1000>;
			fsl,primary-cache-geometry = <32 1>;
			fsl,secondary-cache-geometry = <128 2>;
		};

		pamu1: pamu@1000 {
			reg = <0x1000 0x1000>;
			fsl,primary-cache-geometry = <32 1>;
			fsl,secondary-cache-geometry = <128 2>;
		};

		pamu2: pamu@2000 {
			reg = <0x2000 0x1000>;
			fsl,primary-cache-geometry = <32 1>;
			fsl,secondary-cache-geometry = <128 2>;
		};

		pamu3: pamu@3000 {
			reg = <0x3000 0x1000>;
			fsl,primary-cache-geometry = <32 1>;
			fsl,secondary-cache-geometry = <128 2>;
		};

		pamu4: pamu@4000 {
			reg = <0x4000 0x1000>;
			fsl,primary-cache-geometry = <32 1>;
			fsl,secondary-cache-geometry = <128 2>;
		};
	};

	guts: global-utilities@e0000 {
		compatible = "fsl,qoriq-device-config-1.0";
		reg = <0xe0000 0xe00>;
		fsl,has-rstcr;
		#sleep-cells = <1>;
		fsl,liodn-bits = <12>;
	};

/include/ "qoriq-dma-0.dtsi"
	dma@100300 {
		fsl,iommu-parent = <&pamu0>;
		fsl,liodn-reg = <&guts 0x584>; /* DMA2LIODNR */
	};