168 lines
5.0 KiB
YAML
168 lines
5.0 KiB
YAML
|
# 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 Device Tree Bindings
|
||
|
|
|
||
|
|
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.
|
||
|
|
|
||
|
|
allOf:
|
||
|
|
- $ref: /schemas/dma/dma-controller.yaml#
|
||
|
|
- $ref: /schemas/arm/keystone/ti,k3-sci-common.yaml#
|
||
|
|
|
||
|
|
properties:
|
||
|
|
compatible:
|
||
|
|
const: ti,am64-dmss-bcdma
|
||
|
|
|
||
|
|
"#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
|
||
|
|
|
||
|
|
reg:
|
||
|
|
maxItems: 5
|
||
|
|
|
||
|
|
reg-names:
|
||
|
|
items:
|
||
|
|
- const: gcfg
|
||
|
|
- const: bchanrt
|
||
|
|
- const: rchanrt
|
||
|
|
- const: tchanrt
|
||
|
|
- const: ringrt
|
||
|
|
|
||
|
|
msi-parent: true
|
||
|
|
|
||
|
|
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-bchan
|
||
|
|
- ti,sci-rm-range-tchan
|
||
|
|
- ti,sci-rm-range-rchan
|
||
|
|
|
||
|
|
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 */
|
||
|
|
};
|
||
|
|
};
|
||
|
|
};
|