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Commit 8cc7bc8e authored by Rajan Vaja's avatar Rajan Vaja Committed by Michal Simek
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Documentation: xilinx: Add documentation for eemi APIs 



Add documentation for embedded energy management interface (EEMI)
APIs. It includes information about eemi ops and how to use them.
It also includes API information and supported IOCTL IDs which can
be used for device and control configuration.

Signed-off-by: default avatarRajan Vaja <rajan.vaja@xilinx.com>
Signed-off-by: default avatarJolly Shah <jollys@xilinx.com>
Acked-by: default avatarOlof Johansson <olof@lixom.net>
Signed-off-by: default avatarMichal Simek <michal.simek@xilinx.com>
parent e60f02dd

Documentation/xilinx/eemi.txt

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Xilinx Zynq MPSoC EEMI Documentation

---------------------------------------------------------------------



Xilinx Zynq MPSoC Firmware Interface

-------------------------------------

The zynqmp-firmware node describes the interface to platform firmware.

ZynqMP has an interface to communicate with secure firmware. Firmware

driver provides an interface to firmware APIs. Interface APIs can be

used by any driver to communicate with PMC(Platform Management Controller).



Embedded Energy Management Interface (EEMI)

----------------------------------------------

The embedded energy management interface is used to allow software

components running across different processing clusters on a chip or

device to communicate with a power management controller (PMC) on a

device to issue or respond to power management requests.



EEMI ops is a structure containing all eemi APIs supported by Zynq MPSoC.

The zynqmp-firmware driver maintain all EEMI APIs in zynqmp_eemi_ops

structure. Any driver who want to communicate with PMC using EEMI APIs

can call zynqmp_pm_get_eemi_ops().



Example of EEMI ops:



	/* zynqmp-firmware driver maintain all EEMI APIs */

	struct zynqmp_eemi_ops {

		int (*get_api_version)(u32 *version);

		int (*query_data)(struct zynqmp_pm_query_data qdata, u32 *out);

	};



	static const struct zynqmp_eemi_ops eemi_ops = {

		.get_api_version = zynqmp_pm_get_api_version,

		.query_data = zynqmp_pm_query_data,

	};



Example of EEMI ops usage:



	static const struct zynqmp_eemi_ops *eemi_ops;

	u32 ret_payload[PAYLOAD_ARG_CNT];

	int ret;



	eemi_ops = zynqmp_pm_get_eemi_ops();

	if (!eemi_ops)

		return -ENXIO;



	ret = eemi_ops->query_data(qdata, ret_payload);



IOCTL

------

IOCTL API is for device control and configuration. It is not a system

IOCTL but it is an EEMI API. This API can be used by master to control

any device specific configuration. IOCTL definitions can be platform

specific. This API also manage shared device configuration.



The following IOCTL IDs are valid for device control:

- IOCTL_SET_PLL_FRAC_MODE	8

- IOCTL_GET_PLL_FRAC_MODE	9

- IOCTL_SET_PLL_FRAC_DATA	10

- IOCTL_GET_PLL_FRAC_DATA	11



Refer EEMI API guide [0] for IOCTL specific parameters and other EEMI APIs.



References

----------

[0] Embedded Energy Management Interface (EEMI) API guide:

    https://www.xilinx.com/support/documentation/user_guides/ug1200-eemi-api.pdf