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Secure Proxy is another communication scheme in Texas Instrument's devices intended to provide an unique communication path from various processors in the System on Chip(SoC) to a central System Controller. Secure proxy is, in effect, an evolution of current generation Message Manager hardware block found in K2G devices. However the following changes have taken place: Secure Proxy instance exposes "threads" or "proxies" which is primary representation of "a" communication channel. Each thread is preconfigured by System controller configuration based on SoC usage requirements. Secure proxy by itself represents a single "queue" of communication but allows the proxies to be independently operated. Each Secure proxy thread can uniquely have their own error and threshold interrupts allowing for more fine control of IRQ handling. Provide an hardware description of the same for device tree representation. See AM65x Technical Reference Manual (SPRUID7, April 2018) for further details: http://www.ti.com/lit/pdf/spruid7 Reviewed-by: Rob Herring <robh@kernel.org> Signed-off-by: Nishanth Menon <nm@ti.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
51 lines
1.6 KiB
Plaintext
51 lines
1.6 KiB
Plaintext
Texas Instruments' Secure Proxy
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========================================
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The Texas Instruments' secure proxy is a mailbox controller that has
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configurable queues selectable at SoC(System on Chip) integration. The
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Message manager is broken up into different address regions that are
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called "threads" or "proxies" - each instance is unidirectional and is
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instantiated at SoC integration level by system controller to indicate
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receive or transmit path.
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Message Manager Device Node:
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===========================
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Required properties:
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--------------------
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- compatible: Shall be "ti,am654-secure-proxy"
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- reg-names target_data - Map the proxy data region
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rt - Map the realtime status region
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scfg - Map the configuration region
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- reg: Contains the register map per reg-names.
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- #mbox-cells Shall be 1 and shall refer to the transfer path
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called thread.
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- interrupt-names: Contains interrupt names matching the rx transfer path
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for a given SoC. Receive interrupts shall be of the
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format: "rx_<PID>".
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- interrupts: Contains the interrupt information corresponding to
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interrupt-names property.
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Example(AM654):
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------------
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secure_proxy: mailbox@32c00000 {
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compatible = "ti,am654-secure-proxy";
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#mbox-cells = <1>;
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reg-names = "target_data", "rt", "scfg";
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reg = <0x0 0x32c00000 0x0 0x100000>,
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<0x0 0x32400000 0x0 0x100000>,
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<0x0 0x32800000 0x0 0x100000>;
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interrupt-names = "rx_011";
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interrupts = <GIC_SPI 32 IRQ_TYPE_LEVEL_HIGH>;
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};
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dmsc: dmsc {
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[...]
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mbox-names = "rx", "tx";
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# RX Thread ID is 11
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# TX Thread ID is 13
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mboxes= <&secure_proxy 11>,
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<&secure_proxy 13>;
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[...]
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};
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