On Thu, Oct 10, 2024 at 03:39:09PM +0800, Songwei Chai wrote: > The Trigger Generation Unit (TGU) is designed to detect patterns or > sequences within a specific region of the System on Chip (SoC). Once > configured and activated, it monitors sense inputs and can detect a > pre-programmed state or sequence across clock cycles, subsequently > producing a trigger. > > TGU configuration space > offset table > x-------------------------x > | | > | | > | | Step configuration > | | space layout > | coresight management | x-------------x > | registers | |---> | | > | | | | reserve | > | | | | | > |-------------------------| | |-------------| > | | | | priority[3] | > | step[7] |<-- | |-------------| > |-------------------------| | | | priority[2] | > | | | | |-------------| > | ... | |Steps region | | priority[1] | > | | | | |-------------| > |-------------------------| | | | priority[0] | > | |<-- | |-------------| > | step[0] |--------------------> | | > |-------------------------| | condition | > | | | | > | control and status | x-------------x > | space | | | > x-------------------------x |Timer/Counter| > | | > x-------------x > TGU Configuration in Hardware > > The TGU provides a step region for user configuration, similar > to a flow chart. Each step region consists of three register clusters: > > 1.Priority Region: Sets the required signals with priority. > 2.Condition Region: Defines specific requirements (e.g., signal A > reaches three times) and the subsequent action once the requirement is > met. > 3.Timer/Counter (Optional): Provides timing or counting functionality. > > Add a new coresight-tgu.yaml file to describe the bindings required to > define the TGU in the device trees. > > Signed-off-by: Songwei Chai <quic_songchai@xxxxxxxxxxx> > --- > .../bindings/arm/qcom,coresight-tgu.yaml | 133 ++++++++++++++++++ > 1 file changed, 133 insertions(+) > create mode 100644 Documentation/devicetree/bindings/arm/qcom,coresight-tgu.yaml > > diff --git a/Documentation/devicetree/bindings/arm/qcom,coresight-tgu.yaml b/Documentation/devicetree/bindings/arm/qcom,coresight-tgu.yaml > new file mode 100644 > index 000000000000..25b464486fe2 > --- /dev/null > +++ b/Documentation/devicetree/bindings/arm/qcom,coresight-tgu.yaml > @@ -0,0 +1,133 @@ > +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause > +# Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved. > +%YAML 1.2 > +--- > +$id: http://devicetree.org/schemas/arm/qcom,coresight-tgu.yaml# > +$schema: http://devicetree.org/meta-schemas/core.yaml# > + > +title: Trigger Generation Unit - TGU > + > +description: | > + The Trigger Generation Unit (TGU) is a Data Engine which can be utilized > + to sense a plurality of signals and create a trigger into the CTI or > + generate interrupts to processors. The TGU is like the trigger circuit > + of a Logic Analyzer.The corresponding trigger logic can be realized by space ^ > + configuring the conditions for each step after sensing the signal. > + Once setup and enabled, it will observe sense inputs and based upon > + the activity of those inputs, even over clock cycles, may detect a > + preprogrammed state/sequence and then produce a trigger or interrupt. > + > + The primary use case of the TGU is to detect patterns or sequences on a > + given set of signals within some region of the SoC. > + > +maintainers: > + - Mao Jinlong <quic_jinlmao@xxxxxxxxxxx> > + - Sam Chai <quic_songchai@xxxxxxxxxxx> > + > +# Need a custom select here or 'arm,primecell' will match on lots of nodes > +select: > + properties: > + compatible: > + contains: > + enum: > + - qcom,coresight-tgu > + required: > + - compatible > + > +properties: > + compatible: > + items: > + - const: qcom,coresight-tgu > + - const: arm,primecell > + > + reg: > + maxItems: 1 > + > + clocks: > + maxItems: 1 > + > + clock-names: > + items: > + - const: apb_pclk > + > + qcom,tgu-steps: > + description: > + The trigger logic is realized by configuring each step after sensing > + the signal. The parameter here is used to describe the maximum of steps > + that could be configured in the current TGU. > + $ref: /schemas/types.yaml#/definitions/uint32 > + minimum: 1 > + maximum: 8 > + > + qcom,tgu-regs: > + description: > + There are some "groups" register clusters in each step, which are used to configure the signal > + that we want to detect.Meanwhile, each group has its own priority, and the priority increases space ^ > + with number of groups.For example, group3 has a higher priority than group2 ,the signal configured space ^ Wrong spacing around the ','. > + in group3 will be sensed more preferentially than the signal which is configured in group2. > + The parameter here is used to describe the signal number that each group could be configured. Wrap lines at 80 unless there's some exception not to. > + $ref: /schemas/types.yaml#/definitions/uint32 > + minimum: 1 > + maximum: 18 > + > + qcom,tgu-conditions: > + description: > + A condition sets a specific requirement for a step and defines the subsequent > + action once the requirement is met. For example, in step two, if signal A is > + detected three times, the process jumps back to step one. The parameter describes > + the register number for each functionality, whether it is setting a specific > + requirement or defining a subsequent action. > + $ref: /schemas/types.yaml#/definitions/uint32 > + minimum: 1 > + maximum: 4 > + > + qcom,tgu-timer-counters: > + description: > + TGU has timer and counter which are used to set some requirement on each step. > + For example, we could use counter to create a trigger into CTI once TGU senses > + the target signal three times.This parameter is used to describe the number of > + Timers/Counters in TGU. > + $ref: /schemas/types.yaml#/definitions/uint32 > + minimum: 0 > + maximum: 2 > + > + in-ports: > + $ref: /schemas/graph.yaml#/properties/ports > + additionalProperties: false > + > + properties: > + port: > + description: AXI Slave connected to another Coresight component > + $ref: /schemas/graph.yaml#/properties/port > + > +required: > + - compatible > + - reg > + - clocks > + - clock-names > + > +additionalProperties: false > + > +examples: > + - | > + tgu@10b0e000 { > + compatible = "qcom,coresight-tgu", "arm,primecell"; > + reg = <0x10b0e000 0x1000>; > + > + clocks = <&aoss_qmp>; > + clock-names = "apb_pclk"; > + > + qcom,tgu-steps = <3>; > + qcom,tgu-regs = <4>; > + qcom,tgu-conditions = <4>; > + qcom,tgu-timer-counters = <1>; > + > + in-ports { > + port { > + tgu_in_tpdm_swao: endpoint{ > + remote-endpoint = <&tpdm_swao_out_tgu>; > + }; > + }; > + }; > + }; > +...
