1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 # Copyright (C) 2019 Texas Instruments Incorporated
3 # Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
6 $id: http://devicetree.org/schemas/dma/ti/k3-udma.yaml#
7 $schema: http://devicetree.org/meta-schemas/core.yaml#
9 title: Texas Instruments K3 NAVSS Unified DMA Device Tree Bindings
12 - Peter Ujfalusi <peter.ujfalusi@gmail.com>
15 The UDMA-P is intended to perform similar (but significantly upgraded)
16 functions as the packet-oriented DMA used on previous SoC devices. The UDMA-P
17 module supports the transmission and reception of various packet types.
18 The UDMA-P architecture facilitates the segmentation and reassembly of SoC DMA
19 data structure compliant packets to/from smaller data blocks that are natively
20 compatible with the specific requirements of each connected peripheral.
21 Multiple Tx and Rx channels are provided within the DMA which allow multiple
22 segmentation or reassembly operations to be ongoing. The DMA controller
23 maintains state information for each of the channels which allows packet
24 segmentation and reassembly operations to be time division multiplexed between
25 channels in order to share the underlying DMA hardware. An external DMA
26 scheduler is used to control the ordering and rate at which this multiplexing
27 occurs for Transmit operations. The ordering and rate of Receive operations
28 is indirectly controlled by the order in which blocks are pushed into the DMA
29 on the Rx PSI-L interface.
31 The UDMA-P also supports acting as both a UTC and UDMA-C for its internal
32 channels. Channels in the UDMA-P can be configured to be either Packet-Based
33 or Third-Party channels on a channel by channel basis.
35 All transfers within NAVSS is done between PSI-L source and destination
37 The peripherals serviced by UDMA can be PSI-L native (sa2ul, cpsw, etc) or
38 legacy, non PSI-L native peripherals. In the later case a special, small PDMA
39 is tasked to act as a bridge between the PSI-L fabric and the legacy
42 PDMAs can be configured via UDMAP peer registers to match with the
43 configuration of the legacy peripheral.
46 - $ref: "../dma-controller.yaml#"
53 The cell is the PSI-L thread ID of the remote (to UDMAP) end.
54 Valid ranges for thread ID depends on the data movement direction:
55 for source thread IDs (rx): 0 - 0x7fff
56 for destination thread IDs (tx): 0x8000 - 0xffff
58 Please refer to the device documentation for the PSI-L thread map and also
59 the PSI-L peripheral chapter for the correct thread ID.
61 When #dma-cells is 2, the second parameter is the channel ATYPE.
65 - ti,am654-navss-main-udmap
66 - ti,am654-navss-mcu-udmap
67 - ti,j721e-navss-main-udmap
68 - ti,j721e-navss-mcu-udmap
82 description: phandle to TI-SCI compatible System controller node
83 $ref: /schemas/types.yaml#/definitions/phandle
86 description: TI-SCI device id of UDMAP
87 $ref: /schemas/types.yaml#/definitions/uint32
90 description: phandle to the ring accelerator node
91 $ref: /schemas/types.yaml#/definitions/phandle
93 ti,sci-rm-range-tchan:
95 Array of UDMA tchan resource subtypes for resource allocation for this
97 $ref: /schemas/types.yaml#/definitions/uint32-array
102 ti,sci-rm-range-rchan:
104 Array of UDMA rchan resource subtypes for resource allocation for this
106 $ref: /schemas/types.yaml#/definitions/uint32-array
111 ti,sci-rm-range-rflow:
113 Array of UDMA rflow resource subtypes for resource allocation for this
115 $ref: /schemas/types.yaml#/definitions/uint32-array
129 - ti,sci-rm-range-tchan
130 - ti,sci-rm-range-rchan
131 - ti,sci-rm-range-rflow
140 description: ATYPE value which should be used by non slave channels
141 $ref: /schemas/types.yaml#/definitions/uint32
146 unevaluatedProperties: false
151 #address-cells = <2>;
154 cbass_main_navss: navss@30800000 {
155 compatible = "simple-mfd";
156 #address-cells = <2>;
160 ranges = <0x0 0x30800000 0x0 0x30800000 0x0 0x05000000>;
162 ti,sci-dev-id = <118>;
164 main_udmap: dma-controller@31150000 {
165 compatible = "ti,am654-navss-main-udmap";
166 reg = <0x0 0x31150000 0x0 0x100>,
167 <0x0 0x34000000 0x0 0x100000>,
168 <0x0 0x35000000 0x0 0x100000>;
169 reg-names = "gcfg", "rchanrt", "tchanrt";
172 ti,ringacc = <&ringacc>;
174 msi-parent = <&inta_main_udmass>;
177 ti,sci-dev-id = <188>;
179 ti,sci-rm-range-tchan = <0x1>, /* TX_HCHAN */
181 ti,sci-rm-range-rchan = <0x4>, /* RX_HCHAN */
183 ti,sci-rm-range-rflow = <0x6>; /* GP RFLOW */