1==================================== 2Xilinx Zynq MPSoC EEMI Documentation 3==================================== 4 5Xilinx Zynq MPSoC Firmware Interface 6------------------------------------- 7The zynqmp-firmware node describes the interface to platform firmware. 8ZynqMP has an interface to communicate with secure firmware. Firmware 9driver provides an interface to firmware APIs. Interface APIs can be 10used by any driver to communicate with PMC(Platform Management Controller). 11 12Embedded Energy Management Interface (EEMI) 13---------------------------------------------- 14The embedded energy management interface is used to allow software 15components running across different processing clusters on a chip or 16device to communicate with a power management controller (PMC) on a 17device to issue or respond to power management requests. 18 19EEMI ops is a structure containing all eemi APIs supported by Zynq MPSoC. 20The zynqmp-firmware driver maintain all EEMI APIs in zynqmp_eemi_ops 21structure. Any driver who want to communicate with PMC using EEMI APIs 22can call zynqmp_pm_get_eemi_ops(). 23 24Example of EEMI ops:: 25 26 /* zynqmp-firmware driver maintain all EEMI APIs */ 27 struct zynqmp_eemi_ops { 28 int (*get_api_version)(u32 *version); 29 int (*query_data)(struct zynqmp_pm_query_data qdata, u32 *out); 30 }; 31 32 static const struct zynqmp_eemi_ops eemi_ops = { 33 .get_api_version = zynqmp_pm_get_api_version, 34 .query_data = zynqmp_pm_query_data, 35 }; 36 37Example of EEMI ops usage:: 38 39 static const struct zynqmp_eemi_ops *eemi_ops; 40 u32 ret_payload[PAYLOAD_ARG_CNT]; 41 int ret; 42 43 eemi_ops = zynqmp_pm_get_eemi_ops(); 44 if (IS_ERR(eemi_ops)) 45 return PTR_ERR(eemi_ops); 46 47 ret = eemi_ops->query_data(qdata, ret_payload); 48 49IOCTL 50------ 51IOCTL API is for device control and configuration. It is not a system 52IOCTL but it is an EEMI API. This API can be used by master to control 53any device specific configuration. IOCTL definitions can be platform 54specific. This API also manage shared device configuration. 55 56The following IOCTL IDs are valid for device control: 57- IOCTL_SET_PLL_FRAC_MODE 8 58- IOCTL_GET_PLL_FRAC_MODE 9 59- IOCTL_SET_PLL_FRAC_DATA 10 60- IOCTL_GET_PLL_FRAC_DATA 11 61 62Refer EEMI API guide [0] for IOCTL specific parameters and other EEMI APIs. 63 64References 65---------- 66[0] Embedded Energy Management Interface (EEMI) API guide: 67 https://www.xilinx.com/support/documentation/user_guides/ug1200-eemi-api.pdf 68