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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 10:05:51 +0000
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+QorIQ DPAA Queue Manager Device Tree Binding
+
+Copyright (C) 2008 - 2014 Freescale Semiconductor Inc.
+
+CONTENTS
+
+ - QMan Node
+ - QMan Private Memory Nodes
+ - Example
+
+QMan Node
+
+The Queue Manager is part of the Data-Path Acceleration Architecture (DPAA). QMan
+supports queuing and QoS scheduling of frames to CPUs, network interfaces and
+DPAA logic modules, maintains packet ordering within flows. Besides providing
+flow-level queuing, is also responsible for congestion management functions such
+as RED/WRED, congestion notifications and tail discards. This binding covers the
+CCSR space programming model
+
+PROPERTIES
+
+- compatible
+ Usage: Required
+ Value type: <stringlist>
+ Definition: Must include "fsl,qman"
+ May include "fsl,<SoC>-qman"
+
+- reg
+ Usage: Required
+ Value type: <prop-encoded-array>
+ Definition: Registers region within the CCSR address space
+
+The QMan revision information is located in the QMAN_IP_REV_1/2 registers which
+are located at offsets 0xbf8 and 0xbfc
+
+- interrupts
+ Usage: Required
+ Value type: <prop-encoded-array>
+ Definition: Standard property. The error interrupt
+
+- fsl,qman-portals
+ Usage: Required
+ Value type: <phandle>
+ Definition: Phandle to this QMan instance's portals
+
+- fsl,liodn
+ Usage: See pamu.txt
+ Value type: <prop-encoded-array>
+ Definition: PAMU property used for static LIODN assignment
+
+- fsl,iommu-parent
+ Usage: See pamu.txt
+ Value type: <phandle>
+ Definition: PAMU property used for dynamic LIODN assignment
+
+ For additional details about the PAMU/LIODN binding(s) see pamu.txt
+
+- clocks
+ Usage: See clock-bindings.txt and qoriq-clock.txt
+ Value type: <prop-encoded-array>
+ Definition: Reference input clock. Its frequency is half of the
+ platform clock
+- memory-regions
+ Usage: Required for ARM
+ Value type: <phandle array>
+ Definition: List of phandles referencing the QMan private memory
+ nodes (described below). The qman-fqd node must be
+ first followed by qman-pfdr node. Only used on ARM
+
+Devices connected to a QMan instance via Direct Connect Portals (DCP) must link
+to the respective QMan instance
+
+- fsl,qman
+ Usage: Required
+ Value type: <prop-encoded-array>
+ Description: List of phandle and DCP index pairs, to the QMan instance
+ to which this device is connected via the DCP
+
+QMan Private Memory Nodes
+
+QMan requires two contiguous range of physical memory used for the backing store
+for QMan Frame Queue Descriptor (FQD) and Packed Frame Descriptor Record (PFDR).
+This memory is reserved/allocated as a node under the /reserved-memory node.
+
+For additional details about reserved memory regions see reserved-memory.txt
+
+The QMan FQD memory node must be named "qman-fqd"
+
+PROPERTIES
+
+- compatible
+ Usage: required
+ Value type: <stringlist>
+ Definition: PPC platforms: Must include "fsl,qman-fqd"
+ ARM platforms: Must include "shared-dma-pool"
+ as well as the "no-map" property
+
+The QMan PFDR memory node must be named "qman-pfdr"
+
+PROPERTIES
+
+- compatible
+ Usage: required
+ Value type: <stringlist>
+ Definition: PPC platforms: Must include "fsl,qman-pfdr"
+ ARM platforms: Must include "shared-dma-pool"
+ as well as the "no-map" property
+
+The following constraints are relevant to the FQD and PFDR private memory:
+ - The size must be 2^(size + 1), with size = 11..29. That is 4 KiB to
+ 1 GiB
+ - The alignment must be a muliptle of the memory size
+
+The size of the FQD and PFDP must be chosen by observing the hardware features
+configured via the Reset Configuration Word (RCW) and that are relevant to a
+specific board (e.g. number of MAC(s) pinned-out, number of offline/host command
+FMan ports, etc.). The size configured in the DT must reflect the hardware
+capabilities and not the specific needs of an application
+
+For additional details about reserved memory regions see reserved-memory.txt
+
+EXAMPLE
+
+The example below shows a QMan FQD and a PFDR dynamic allocation memory nodes
+
+ reserved-memory {
+ #address-cells = <2>;
+ #size-cells = <2>;
+ ranges;
+
+ qman_fqd: qman-fqd {
+ compatible = "shared-dma-pool";
+ size = <0 0x400000>;
+ alignment = <0 0x400000>;
+ no-map;
+ };
+ qman_pfdr: qman-pfdr {
+ compatible = "shared-dma-pool";
+ size = <0 0x2000000>;
+ alignment = <0 0x2000000>;
+ no-map;
+ };
+ };
+
+The example below shows a (P4080) QMan CCSR-space node
+
+ qportals: qman-portals@ff4200000 {
+ ...
+ };
+
+ clockgen: global-utilities@e1000 {
+ ...
+ sysclk: sysclk {
+ ...
+ };
+ ...
+ platform_pll: platform-pll@c00 {
+ #clock-cells = <1>;
+ reg = <0xc00 0x4>;
+ compatible = "fsl,qoriq-platform-pll-1.0";
+ clocks = <&sysclk>;
+ clock-output-names = "platform-pll", "platform-pll-div2";
+ };
+ ...
+ };
+
+ crypto@300000 {
+ ...
+ fsl,qman = <&qman, 2>;
+ ...
+ };
+
+ qman: qman@318000 {
+ compatible = "fsl,qman";
+ reg = <0x318000 0x1000>;
+ interrupts = <16 2 1 3>
+ fsl,liodn = <0x16>;
+ fsl,qman-portals = <&qportals>;
+ memory-region = <&qman_fqd &qman_pfdr>;
+ clocks = <&platform_pll 1>;
+ };
+
+ fman@400000 {
+ ...
+ fsl,qman = <&qman, 0>;
+ ...
+ };