summaryrefslogtreecommitdiffstats
path: root/dts/Bindings/dma/ti/k3-bcdma.yaml
blob: b15f68c499cb2396a1a8626049ff82d5b6744a45 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
%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@ti.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#

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 */
            };
        };
    };