* Freescale Management Complex
The Freescale Management Complex (fsl-mc) is a hardware resource
manager that manages specialized hardware objects used in
network-oriented packet processing applications. After the fsl-mc
block is enabled, pools of hardware resources are available, such as
queues, buffer pools, I/O interfaces. These resources are building
blocks that can be used to create functional hardware objects/devices
such as network interfaces, crypto accelerator instances, L2 switches,
etc.
For an overview of the DPAA2 architecture and fsl-mc bus see:
Documentation/networking/device_drivers/ethernet/freescale/dpaa2/overview.rst
As described in the above overview, all DPAA2 objects in a DPRC share the
same hardware "isolation context" and a 10-bit value called an ICID
(isolation context id) is expressed by the hardware to identify
the requester.
The generic 'iommus' property is insufficient to describe the relationship
between ICIDs and IOMMUs, so an iommu-map property is used to define
the set of possible ICIDs under a root DPRC and how they map to
an IOMMU.
For generic IOMMU bindings, see
Documentation/devicetree/bindings/iommu/iommu.txt.
For arm-smmu binding, see:
Documentation/devicetree/bindings/iommu/arm,smmu.yaml.
The MSI writes are accompanied by sideband data which is derived from the ICID.
The msi-map property is used to associate the devices with both the ITS
controller and the sideband data which accompanies the writes.
For generic MSI bindings, see
Documentation/devicetree/bindings/interrupt-controller/msi.txt.
For GICv3 and GIC ITS bindings, see:
Documentation/devicetree/bindings/interrupt-controller/arm,gic-v3.yaml.
Required properties:
- compatible
Value type: <string>
Definition: Must be "fsl,qoriq-mc". A Freescale Management Complex
compatible with this binding must have Block Revision
Registers BRR1 and BRR2 at offset 0x0BF8 and 0x0BFC in
the MC control register region.
- reg
Value type: <prop-encoded-array>
Definition: A standard property. Specifies one or two regions
defining the MC's registers:
-the first region is the command portal for the
this machine and must always be present
-the second region is the MC control registers. This
region may not be present in some scenarios, such
as in the device tree presented to a virtual machine.
- ranges
Value type: <prop-encoded-array>
Definition: A standard property. Defines the mapping between the child
MC address space and the parent system address space.
The MC address space is defined by 3 components:
<region type> <offset hi> <offset lo>
Valid values for region type are
0x0 - MC portals
0x1 - QBMAN portals
- #address-cells
Value type: <u32>
Definition: Must be 3. (see definition in 'ranges' property)
- #size-cells
Value type: <u32>
Definition: Must be 1.
Sub-nodes:
The fsl-mc node may optionally have dpmac sub-nodes that describe
the relationship between the Ethernet MACs which belong to the MC
and the Ethernet PHYs on the system board.
The dpmac nodes must be under a node named "dpmacs" which contains
the following properties:
- #address-cells
Value type: <u32>
Definition: Must be present if dpmac sub-nodes are defined and must
have a value of 1.
- #size-cells
Value type: <u32>
Definition: Must be present if dpmac sub-nodes are defined and must
have a value of 0.
These nodes must have the following properties:
- compatible
Value type: <string>
Definition: Must be "fsl,qoriq-mc-dpmac".
- reg
Value type: <prop-encoded-array>
Definition: Specifies the id of the dpmac.
- phy-handle
Value type: <phandle>
Definition: Specifies the phandle to the PHY device node associated
with the this dpmac.
Optional properties:
- iommu-map: Maps an ICID to an IOMMU and associated iommu-specifier
data.
The property is an arbitrary number of tuples of
(icid-base,iommu,iommu-base,length).
Any ICID i in the interval [icid-base, icid-base + length) is
associated with the listed IOMMU, with the iommu-specifier
(i - icid-base + iommu-base).
- msi-map: Maps an ICID to a GIC ITS and associated msi-specifier
data.
The property is an arbitrary number of tuples of
(icid-base,gic-its,msi-base,length).
Any ICID in the interval [icid-base, icid-base + length) is
associated with the listed GIC ITS, with the msi-specifier
(i - icid-base + msi-base).
Deprecated properties:
- msi-parent
Value type: <phandle>
Definition: Describes the MSI controller node handling message
interrupts for the MC. When there is no translation
between the ICID and deviceID this property can be used
to describe the MSI controller used by the devices on the
mc-bus.
The use of this property for mc-bus is deprecated. Please
use msi-map.
Example:
smmu: iommu@5000000 {
compatible = "arm,mmu-500";
#iommu-cells = <1>;
stream-match-mask = <0x7C00>;
...
};
gic: interrupt-controller@6000000 {
compatible = "arm,gic-v3";
...
}
its: gic-its@6020000 {
compatible = "arm,gic-v3-its";
msi-controller;
...
};
fsl_mc: fsl-mc@80c000000 {
compatible = "fsl,qoriq-mc";
reg = <0x00000008 0x0c000000 0 0x40>, /* MC portal base */
<0x00000000 0x08340000 0 0x40000>; /* MC control reg */
/* define map for ICIDs 23-64 */
iommu-map = <23 &smmu 23 41>;
/* define msi map for ICIDs 23-64 */
msi-map = <23 &its 23 41>;
#address-cells = <3>;
#size-cells = <1>;
/*
* Region type 0x0 - MC portals
* Region type 0x1 - QBMAN portals
*/
ranges = <0x0 0x0 0x0 0x8 0x0c000000 0x4000000
0x1 0x0 0x0 0x8 0x18000000 0x8000000>;
dpmacs {
#address-cells = <1>;
#size-cells = <0>;
dpmac@1 {
compatible = "fsl,qoriq-mc-dpmac";
reg = <1>;
phy-handle = <&mdio0_phy0>;
}
}
};