| # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) |
| # Copyright (C) 2020 Texas Instruments Incorporated |
| # Author: Peter Ujfalusi <peter.ujfalusi@ti.com> |
| %YAML 1.2 |
| --- |
| $id: http://devicetree.org/schemas/dma/ti/k3-bcdma.yaml# |
| $schema: http://devicetree.org/meta-schemas/core.yaml# |
| |
| title: Texas Instruments K3 DMSS BCDMA |
| |
| maintainers: |
| - Peter Ujfalusi <peter.ujfalusi@gmail.com> |
| |
| description: | |
| The Block Copy DMA (BCDMA) is intended to perform similar functions as the TR |
| mode channels of K3 UDMA-P. |
| BCDMA includes block copy channels and Split channels. |
| |
| Block copy channels mainly used for memory to memory transfers, but with |
| optional triggers a block copy channel can service peripherals by accessing |
| directly to memory mapped registers or area. |
| |
| Split channels can be used to service PSI-L based peripherals. |
| The peripherals can be PSI-L native or legacy, non PSI-L native peripherals |
| with PDMAs. PDMA is tasked to act as a bridge between the PSI-L fabric and the |
| legacy peripheral. |
| |
| PDMAs can be configured via BCDMA split channel's peer registers to match with |
| the configuration of the legacy peripheral. |
| |
| properties: |
| compatible: |
| enum: |
| - ti,am62a-dmss-bcdma-csirx |
| - ti,am64-dmss-bcdma |
| - ti,j721s2-dmss-bcdma-csi |
| |
| reg: |
| minItems: 3 |
| maxItems: 5 |
| |
| reg-names: |
| minItems: 3 |
| maxItems: 5 |
| |
| "#dma-cells": |
| const: 3 |
| description: | |
| cell 1: type of the BCDMA channel to be used to service the peripheral: |
| 0 - split channel |
| 1 - block copy channel using global trigger 1 |
| 2 - block copy channel using global trigger 2 |
| 3 - block copy channel using local trigger |
| |
| cell 2: parameter for the channel: |
| if cell 1 is 0 (split channel): |
| PSI-L thread ID of the remote (to BCDMA) 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. |
| if cell 1 is 1 or 2 (block copy channel using global trigger): |
| Unused, ignored |
| |
| The trigger must be configured for the channel externally to BCDMA, |
| channels using global triggers should not be requested directly, but |
| via DMA event router. |
| if cell 1 is 3 (block copy channel using local trigger): |
| bchan number of the locally triggered channel |
| |
| cell 3: ASEL value for the channel |
| |
| msi-parent: true |
| |
| power-domains: |
| description: |
| Power domain if available |
| maxItems: 1 |
| |
| ti,asel: |
| $ref: /schemas/types.yaml#/definitions/uint32 |
| description: ASEL value for non slave channels |
| |
| ti,sci-rm-range-bchan: |
| $ref: /schemas/types.yaml#/definitions/uint32-array |
| description: | |
| Array of BCDMA block-copy channel resource subtypes for resource |
| allocation for this host |
| minItems: 1 |
| # Should be enough |
| maxItems: 255 |
| items: |
| maximum: 0x3f |
| |
| ti,sci-rm-range-tchan: |
| $ref: /schemas/types.yaml#/definitions/uint32-array |
| description: | |
| Array of BCDMA split tx channel resource subtypes for resource allocation |
| for this host |
| minItems: 1 |
| # Should be enough |
| maxItems: 255 |
| items: |
| maximum: 0x3f |
| |
| ti,sci-rm-range-rchan: |
| $ref: /schemas/types.yaml#/definitions/uint32-array |
| description: | |
| Array of BCDMA split rx channel resource subtypes for resource allocation |
| for this host |
| minItems: 1 |
| # Should be enough |
| maxItems: 255 |
| items: |
| maximum: 0x3f |
| |
| required: |
| - compatible |
| - "#dma-cells" |
| - reg |
| - reg-names |
| - msi-parent |
| - ti,sci |
| - ti,sci-dev-id |
| - ti,sci-rm-range-rchan |
| |
| allOf: |
| - $ref: /schemas/dma/dma-controller.yaml# |
| - $ref: /schemas/arm/keystone/ti,k3-sci-common.yaml# |
| |
| - if: |
| properties: |
| compatible: |
| contains: |
| const: ti,am62a-dmss-bcdma-csirx |
| then: |
| properties: |
| ti,sci-rm-range-bchan: false |
| ti,sci-rm-range-tchan: false |
| |
| reg: |
| maxItems: 3 |
| |
| reg-names: |
| items: |
| - const: gcfg |
| - const: rchanrt |
| - const: ringrt |
| |
| required: |
| - power-domains |
| |
| - if: |
| properties: |
| compatible: |
| contains: |
| const: ti,am64-dmss-bcdma |
| then: |
| properties: |
| reg: |
| minItems: 5 |
| |
| reg-names: |
| items: |
| - const: gcfg |
| - const: bchanrt |
| - const: rchanrt |
| - const: tchanrt |
| - const: ringrt |
| |
| required: |
| - ti,sci-rm-range-bchan |
| - ti,sci-rm-range-tchan |
| |
| - if: |
| properties: |
| compatible: |
| contains: |
| const: ti,j721s2-dmss-bcdma-csi |
| then: |
| properties: |
| ti,sci-rm-range-bchan: false |
| |
| reg: |
| maxItems: 4 |
| |
| reg-names: |
| items: |
| - const: gcfg |
| - const: rchanrt |
| - const: tchanrt |
| - const: ringrt |
| |
| required: |
| - ti,sci-rm-range-tchan |
| |
| unevaluatedProperties: false |
| |
| examples: |
| - |+ |
| cbass_main { |
| #address-cells = <2>; |
| #size-cells = <2>; |
| |
| main_dmss { |
| compatible = "simple-mfd"; |
| #address-cells = <2>; |
| #size-cells = <2>; |
| dma-ranges; |
| ranges; |
| |
| ti,sci-dev-id = <25>; |
| |
| main_bcdma: dma-controller@485c0100 { |
| compatible = "ti,am64-dmss-bcdma"; |
| |
| reg = <0x0 0x485c0100 0x0 0x100>, |
| <0x0 0x4c000000 0x0 0x20000>, |
| <0x0 0x4a820000 0x0 0x20000>, |
| <0x0 0x4aa40000 0x0 0x20000>, |
| <0x0 0x4bc00000 0x0 0x100000>; |
| reg-names = "gcfg", "bchanrt", "rchanrt", "tchanrt", "ringrt"; |
| msi-parent = <&inta_main_dmss>; |
| #dma-cells = <3>; |
| |
| ti,sci = <&dmsc>; |
| ti,sci-dev-id = <26>; |
| |
| ti,sci-rm-range-bchan = <0x20>; /* BLOCK_COPY_CHAN */ |
| ti,sci-rm-range-rchan = <0x21>; /* SPLIT_TR_RX_CHAN */ |
| ti,sci-rm-range-tchan = <0x22>; /* SPLIT_TR_TX_CHAN */ |
| }; |
| }; |
| }; |