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Xilinx ZynqMP IPI(Inter Processor Interrupt) is a hardware block in ZynqMP SoC used for the communication between various processor systems. Signed-off-by: Wendy Liang <wendy.liang@xilinx.com> Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
128 lines
4.1 KiB
Plaintext
128 lines
4.1 KiB
Plaintext
Xilinx IPI Mailbox Controller
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========================================
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The Xilinx IPI(Inter Processor Interrupt) mailbox controller is to manage
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messaging between two Xilinx Zynq UltraScale+ MPSoC IPI agents. Each IPI
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agent owns registers used for notification and buffers for message.
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+-------------------------------------+
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| Xilinx ZynqMP IPI Controller |
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+-------------------------------------+
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+--------------------------------------------------+
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ATF | |
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+--------------------------+ |
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+--------------------------------------------------+
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+------------------------------------------+
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| +----------------+ +----------------+ |
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Hardware | | IPI Agent | | IPI Buffers | |
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| | Registers | | | |
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| | | | | |
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| +----------------+ +----------------+ |
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| Xilinx IPI Agent Block |
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+------------------------------------------+
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Controller Device Node:
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===========================
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Required properties:
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--------------------
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IPI agent node:
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- compatible: Shall be: "xlnx,zynqmp-ipi-mailbox"
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- interrupt-parent: Phandle for the interrupt controller
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- interrupts: Interrupt information corresponding to the
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interrupt-names property.
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- xlnx,ipi-id: local Xilinx IPI agent ID
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- #address-cells: number of address cells of internal IPI mailbox nodes
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- #size-cells: number of size cells of internal IPI mailbox nodes
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Internal IPI mailbox node:
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- reg: IPI buffers address ranges
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- reg-names: Names of the reg resources. It should have:
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* local_request_region
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- IPI request msg buffer written by local and read
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by remote
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* local_response_region
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- IPI response msg buffer written by local and read
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by remote
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* remote_request_region
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- IPI request msg buffer written by remote and read
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by local
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* remote_response_region
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- IPI response msg buffer written by remote and read
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by local
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- #mbox-cells: Shall be 1. It contains:
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* tx(0) or rx(1) channel
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- xlnx,ipi-id: remote Xilinx IPI agent ID of which the mailbox is
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connected to.
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Optional properties:
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--------------------
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- method: The method of accessing the IPI agent registers.
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Permitted values are: "smc" and "hvc". Default is
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"smc".
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Client Device Node:
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===========================
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Required properties:
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--------------------
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- mboxes: Standard property to specify a mailbox
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(See ./mailbox.txt)
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- mbox-names: List of identifier strings for each mailbox
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channel.
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Example:
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===========================
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zynqmp_ipi {
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compatible = "xlnx,zynqmp-ipi-mailbox";
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interrupt-parent = <&gic>;
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interrupts = <0 29 4>;
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xlnx,ipi-id = <0>;
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#address-cells = <1>;
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#size-cells = <1>;
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ranges;
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/* APU<->RPU0 IPI mailbox controller */
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ipi_mailbox_rpu0: mailbox@ff90400 {
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reg = <0xff990400 0x20>,
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<0xff990420 0x20>,
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<0xff990080 0x20>,
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<0xff9900a0 0x20>;
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reg-names = "local_request_region",
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"local_response_region",
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"remote_request_region",
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"remote_response_region";
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#mbox-cells = <1>;
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xlnx,ipi-id = <1>;
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};
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/* APU<->RPU1 IPI mailbox controller */
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ipi_mailbox_rpu1: mailbox@ff990440 {
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reg = <0xff990440 0x20>,
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<0xff990460 0x20>,
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<0xff990280 0x20>,
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<0xff9902a0 0x20>;
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reg-names = "local_request_region",
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"local_response_region",
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"remote_request_region",
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"remote_response_region";
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#mbox-cells = <1>;
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xlnx,ipi-id = <2>;
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};
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};
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rpu0 {
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...
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mboxes = <&ipi_mailbox_rpu0 0>,
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<&ipi_mailbox_rpu0 1>;
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mbox-names = "tx", "rx";
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};
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rpu1 {
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...
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mboxes = <&ipi_mailbox_rpu1 0>,
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<&ipi_mailbox_rpu1 1>;
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mbox-names = "tx", "rx";
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};
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