136 lines
3.4 KiB
Plaintext
136 lines
3.4 KiB
Plaintext
QorIQ DPAA Buffer Manager Device Tree Bindings
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Copyright (C) 2008 - 2014 Freescale Semiconductor Inc.
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CONTENTS
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- BMan Node
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- BMan Private Memory Node
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- Example
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BMan Node
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The Buffer Manager is part of the Data-Path Acceleration Architecture (DPAA).
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BMan supports hardware allocation and deallocation of buffers belonging to pools
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originally created by software with configurable depletion thresholds. This
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binding covers the CCSR space programming model
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PROPERTIES
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- compatible
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Usage: Required
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Value type: <stringlist>
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Definition: Must include "fsl,bman"
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May include "fsl,<SoC>-bman"
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- reg
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Usage: Required
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Value type: <prop-encoded-array>
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Definition: Registers region within the CCSR address space
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The BMan revision information is located in the BMAN_IP_REV_1/2 registers which
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are located at offsets 0xbf8 and 0xbfc
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- interrupts
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Usage: Required
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Value type: <prop-encoded-array>
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Definition: Standard property. The error interrupt
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- fsl,bman-portals
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Usage: Required
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Value type: <phandle>
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Definition: Phandle to this BMan instance's portals
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- fsl,liodn
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Usage: See pamu.txt
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Value type: <prop-encoded-array>
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Definition: PAMU property used for static LIODN assignment
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- fsl,iommu-parent
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Usage: See pamu.txt
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Value type: <phandle>
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Definition: PAMU property used for dynamic LIODN assignment
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For additional details about the PAMU/LIODN binding(s) see pamu.txt
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Devices connected to a BMan instance via Direct Connect Portals (DCP) must link
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to the respective BMan instance
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- fsl,bman
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Usage: Required
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Value type: <prop-encoded-array>
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Description: List of phandle and DCP index pairs, to the BMan instance
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to which this device is connected via the DCP
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BMan Private Memory Node
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BMan requires a contiguous range of physical memory used for the backing store
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for BMan Free Buffer Proxy Records (FBPR). This memory is reserved/allocated as a
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node under the /reserved-memory node
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The BMan FBPR memory node must be named "bman-fbpr"
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PROPERTIES
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- compatible
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Usage: required
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Value type: <stringlist>
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Definition: Must inclide "fsl,bman-fbpr"
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The following constraints are relevant to the FBPR private memory:
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- The size must be 2^(size + 1), with size = 11..33. That is 4 KiB to
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16 GiB
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- The alignment must be a muliptle of the memory size
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The size of the FBPR must be chosen by observing the hardware features configured
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via the Reset Configuration Word (RCW) and that are relevant to a specific board
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(e.g. number of MAC(s) pinned-out, number of offline/host command FMan ports,
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etc.). The size configured in the DT must reflect the hardware capabilities and
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not the specific needs of an application
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For additional details about reserved memory regions see reserved-memory.txt
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EXAMPLE
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The example below shows a BMan FBPR dynamic allocation memory node
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reserved-memory {
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#address-cells = <2>;
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#size-cells = <2>;
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ranges;
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bman_fbpr: bman-fbpr {
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compatible = "fsl,bman-fbpr";
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alloc-ranges = <0 0 0x10 0>;
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size = <0 0x1000000>;
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alignment = <0 0x1000000>;
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};
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};
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The example below shows a (P4080) BMan CCSR-space node
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bportals: bman-portals@ff4000000 {
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...
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};
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crypto@300000 {
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...
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fsl,bman = <&bman, 2>;
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...
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};
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bman: bman@31a000 {
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compatible = "fsl,bman";
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reg = <0x31a000 0x1000>;
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interrupts = <16 2 1 2>;
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fsl,liodn = <0x17>;
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fsl,bman-portals = <&bportals>;
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memory-region = <&bman_fbpr>;
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};
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fman@400000 {
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...
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fsl,bman = <&bman, 0>;
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...
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};
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