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# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
# Copyright (C) 2019 Texas Instruments Incorporated
# Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
%YAML 1.2
---
$id: http://devicetree.org/schemas/dma/ti/k3-udma.yaml#
$schema: http://devicetree.org/meta-schemas/core.yaml#
title: Texas Instruments K3 NAVSS Unified DMA
maintainers:
- Peter Ujfalusi <peter.ujfalusi@gmail.com>
description: |
The UDMA-P is intended to perform similar (but significantly upgraded)
functions as the packet-oriented DMA used on previous SoC devices. The UDMA-P
module supports the transmission and reception of various packet types.
The UDMA-P architecture facilitates the segmentation and reassembly of SoC DMA
data structure compliant packets to/from smaller data blocks that are natively
compatible with the specific requirements of each connected peripheral.
Multiple Tx and Rx channels are provided within the DMA which allow multiple
segmentation or reassembly operations to be ongoing. The DMA controller
maintains state information for each of the channels which allows packet
segmentation and reassembly operations to be time division multiplexed between
channels in order to share the underlying DMA hardware. An external DMA
scheduler is used to control the ordering and rate at which this multiplexing
occurs for Transmit operations. The ordering and rate of Receive operations
is indirectly controlled by the order in which blocks are pushed into the DMA
on the Rx PSI-L interface.
The UDMA-P also supports acting as both a UTC and UDMA-C for its internal
channels. Channels in the UDMA-P can be configured to be either Packet-Based
or Third-Party channels on a channel by channel basis.
All transfers within NAVSS is done between PSI-L source and destination
threads.
The peripherals serviced by UDMA can be PSI-L native (sa2ul, cpsw, etc) or
legacy, non PSI-L native peripherals. In the later case a special, small PDMA
is tasked to act as a bridge between the PSI-L fabric and the legacy
peripheral.
PDMAs can be configured via UDMAP peer registers to match with the
configuration of the legacy peripheral.
allOf:
- $ref: ../dma-controller.yaml#
- $ref: /schemas/arm/keystone/ti,k3-sci-common.yaml#
properties:
"#dma-cells":
minimum: 1
maximum: 2
description: |
The cell is the PSI-L thread ID of the remote (to UDMAP) end.
Valid ranges for thread ID depends on the data movement direction:
for source thread IDs (rx): 0 - 0x7fff
for destination thread IDs (tx): 0x8000 - 0xffff
Please refer to the device documentation for the PSI-L thread map and also
the PSI-L peripheral chapter for the correct thread ID.
When #dma-cells is 2, the second parameter is the channel ATYPE.
compatible:
enum:
- ti,am654-navss-main-udmap
- ti,am654-navss-mcu-udmap
- ti,j721e-navss-main-udmap
- ti,j721e-navss-mcu-udmap
reg:
maxItems: 3
reg-names:
items:
- const: gcfg
- const: rchanrt
- const: tchanrt
msi-parent: true
ti,ringacc:
description: phandle to the ring accelerator node
$ref: /schemas/types.yaml#/definitions/phandle
ti,sci-rm-range-tchan:
description: |
Array of UDMA tchan resource subtypes for resource allocation for this
host
$ref: /schemas/types.yaml#/definitions/uint32-array
minItems: 1
# Should be enough
maxItems: 255
ti,sci-rm-range-rchan:
description: |
Array of UDMA rchan resource subtypes for resource allocation for this
host
$ref: /schemas/types.yaml#/definitions/uint32-array
minItems: 1
# Should be enough
maxItems: 255
ti,sci-rm-range-rflow:
description: |
Array of UDMA rflow resource subtypes for resource allocation for this
host
$ref: /schemas/types.yaml#/definitions/uint32-array
minItems: 1
# Should be enough
maxItems: 255
required:
- compatible
- "#dma-cells"
- reg
- reg-names
- msi-parent
- ti,sci
- ti,sci-dev-id
- ti,ringacc
- ti,sci-rm-range-tchan
- ti,sci-rm-range-rchan
- ti,sci-rm-range-rflow
if:
properties:
"#dma-cells":
const: 2
then:
properties:
ti,udma-atype:
description: ATYPE value which should be used by non slave channels
$ref: /schemas/types.yaml#/definitions/uint32
required:
- ti,udma-atype
unevaluatedProperties: false
examples:
- |+
cbass_main {
#address-cells = <2>;
#size-cells = <2>;
cbass_main_navss: navss@30800000 {
compatible = "simple-mfd";
#address-cells = <2>;
#size-cells = <2>;
dma-coherent;
dma-ranges;
ranges = <0x0 0x30800000 0x0 0x30800000 0x0 0x05000000>;
ti,sci-dev-id = <118>;
main_udmap: dma-controller@31150000 {
compatible = "ti,am654-navss-main-udmap";
reg = <0x0 0x31150000 0x0 0x100>,
<0x0 0x34000000 0x0 0x100000>,
<0x0 0x35000000 0x0 0x100000>;
reg-names = "gcfg", "rchanrt", "tchanrt";
#dma-cells = <1>;
ti,ringacc = <&ringacc>;
msi-parent = <&inta_main_udmass>;
ti,sci = <&dmsc>;
ti,sci-dev-id = <188>;
ti,sci-rm-range-tchan = <0x1>, /* TX_HCHAN */
<0x2>; /* TX_CHAN */
ti,sci-rm-range-rchan = <0x4>, /* RX_HCHAN */
<0x5>; /* RX_CHAN */
ti,sci-rm-range-rflow = <0x6>; /* GP RFLOW */
};
};
};
|
