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-QorIQ DPAA Buffer Manager Device Tree Bindings
-
-Copyright (C) 2008 - 2014 Freescale Semiconductor Inc.
-
-CONTENTS
-
- - BMan Node
- - BMan Private Memory Node
- - Example
-
-BMan Node
-
-The Buffer Manager is part of the Data-Path Acceleration Architecture (DPAA).
-BMan supports hardware allocation and deallocation of buffers belonging to pools
-originally created by software with configurable depletion thresholds. This
-binding covers the CCSR space programming model
-
-PROPERTIES
-
-- compatible
- Usage: Required
- Value type: <stringlist>
- Definition: Must include "fsl,bman"
- May include "fsl,<SoC>-bman"
-
-- reg
- Usage: Required
- Value type: <prop-encoded-array>
- Definition: Registers region within the CCSR address space
-
-The BMan revision information is located in the BMAN_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,bman-portals
- Usage: Required
- Value type: <phandle>
- Definition: Phandle to this BMan 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
-
-Devices connected to a BMan instance via Direct Connect Portals (DCP) must link
-to the respective BMan instance
-
-- fsl,bman
- Usage: Required
- Value type: <prop-encoded-array>
- Description: List of phandle and DCP index pairs, to the BMan instance
- to which this device is connected via the DCP
-
-BMan Private Memory Node
-
-BMan requires a contiguous range of physical memory used for the backing store
-for BMan Free Buffer Proxy Records (FBPR). This memory is reserved/allocated as
-a node under the /reserved-memory node.
-
-The BMan FBPR memory node must be named "bman-fbpr"
-
-PROPERTIES
-
-- compatible
- Usage: required
- Value type: <stringlist>
- Definition: PPC platforms: Must include "fsl,bman-fbpr"
- ARM platforms: Must include "shared-dma-pool"
- as well as the "no-map" property
-
-The following constraints are relevant to the FBPR private memory:
- - The size must be 2^(size + 1), with size = 11..33. That is 4 KiB to
- 16 GiB
- - The alignment must be a muliptle of the memory size
-
-The size of the FBPR 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 BMan FBPR dynamic allocation memory node
-
- reserved-memory {
- #address-cells = <2>;
- #size-cells = <2>;
- ranges;
-
- bman_fbpr: bman-fbpr {
- compatible = "shared-mem-pool";
- size = <0 0x1000000>;
- alignment = <0 0x1000000>;
- no-map;
- };
- };
-
-The example below shows a (P4080) BMan CCSR-space node
-
- bportals: bman-portals@ff4000000 {
- ...
- };
-
- crypto@300000 {
- ...
- fsl,bman = <&bman, 2>;
- ...
- };
-
- bman: bman@31a000 {
- compatible = "fsl,bman";
- reg = <0x31a000 0x1000>;
- interrupts = <16 2 1 2>;
- fsl,liodn = <0x17>;
- fsl,bman-portals = <&bportals>;
- memory-region = <&bman_fbpr>;
- };
-
- fman@400000 {
- ...
- fsl,bman = <&bman, 0>;
- ...
- };