3d03137864
Driver needs ZynqMP firmware interface to call EEMI APIs. In case firmware is not ready, dependent drivers should wait until the firmware is ready. Signed-off-by: Rajan Vaja <rajan.vaja@xilinx.com> Signed-off-by: Jolly Shah <jollys@xilinx.com> Signed-off-by: Michal Simek <michal.simek@xilinx.com>
68 lines
2.4 KiB
Plaintext
68 lines
2.4 KiB
Plaintext
---------------------------------------------------------------------
|
|
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 (IS_ERR(eemi_ops))
|
|
return PTR_ERR(eemi_ops);
|
|
|
|
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
|