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Diffstat (limited to 'kernel/Documentation/devicetree/bindings/soc/fsl/qman.txt')
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diff --git a/kernel/Documentation/devicetree/bindings/soc/fsl/qman.txt b/kernel/Documentation/devicetree/bindings/soc/fsl/qman.txt new file mode 100644 index 000000000..556ebb8be --- /dev/null +++ b/kernel/Documentation/devicetree/bindings/soc/fsl/qman.txt @@ -0,0 +1,175 @@ +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 + +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 nodes under the /reserved-memory node + +The QMan FQD memory node must be named "qman-fqd" + +PROPERTIES + +- compatible + Usage: required + Value type: <stringlist> + Definition: Must inclide "fsl,qman-fqd" + +The QMan PFDR memory node must be named "qman-pfdr" + +PROPERTIES + +- compatible + Usage: required + Value type: <stringlist> + Definition: Must inclide "fsl,qman-pfdr" + +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 = "fsl,qman-fqd"; + alloc-ranges = <0 0 0x10 0>; + size = <0 0x400000>; + alignment = <0 0x400000>; + }; + qman_pfdr: qman-pfdr { + compatible = "fsl,qman-pfdr"; + alloc-ranges = <0 0 0x10 0>; + size = <0 0x2000000>; + alignment = <0 0x2000000>; + }; + }; + +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>; + ... + }; |