plat: xilinx: versal: Add support of register notifier

Add support of register notifier.

Signed-off-by: Tejas Patel <tejas.patel@xilinx.com>
Signed-off-by: Rajan Vaja <rajan.vaja@xilinx.com>
Change-Id: I41ef4c63abcc9aee552790b843adb25a5fd0c23e

plat/xilinx/versal/pm_service/pm_api_sys.c

@@ -877,6 +877,7 @@ enum pm_ret_status pm_feature_check(uint32_t api_id, unsigned int *version)
 	case PM_FEATURE_CHECK:
 	case PM_INIT_FINALIZE:
 	case PM_SET_MAX_LATENCY:
+	case PM_REGISTER_NOTIFIER:
 		*version = (PM_API_BASE_VERSION << 16);
 		break;
 	case PM_LOAD_PDI:
@@ -962,3 +963,25 @@ enum pm_ret_status pm_set_max_latency(uint32_t device_id, uint32_t latency)
 
 	return pm_ipi_send_sync(primary_proc, payload, NULL, 0);
 }
+
+/**
+ * pm_register_notifier() - PM call to register a subsystem to be notified
+ * 			    about the device event
+ * @device_id	Device ID for the Node to which the event is related
+ * @event	Event in question
+ * @wake	Wake subsystem upon capturing the event if value 1
+ * @enable	Enable the registration for value 1, disable for value 0
+ *
+ * @return	Returns status, either success or error+reason
+ */
+enum pm_ret_status pm_register_notifier(uint32_t device_id, uint32_t event,
+					uint32_t wake, uint32_t enable)
+{
+	uint32_t payload[PAYLOAD_ARG_CNT];
+
+	/* Send request to the PMC */
+	PM_PACK_PAYLOAD5(payload, LIBPM_MODULE_ID, PM_REGISTER_NOTIFIER,
+			 device_id, event, wake, enable);
+
+	return pm_ipi_send_sync(primary_proc, payload, NULL, 0);
+}

plat/xilinx/versal/pm_service/pm_api_sys.h

@@ -75,4 +75,6 @@ enum pm_ret_status pm_get_op_characteristic(uint32_t device_id,
 					    enum pm_opchar_type type,
 					    uint32_t *result);
 enum pm_ret_status pm_set_max_latency(uint32_t device_id, uint32_t latency);
+enum pm_ret_status pm_register_notifier(uint32_t device_id, uint32_t event,
+					uint32_t wake, uint32_t enable);
 #endif /* PM_API_SYS_H */

plat/xilinx/versal/pm_service/pm_defs.h

@@ -45,6 +45,7 @@
 #define PM_GET_API_VERSION		1U
 #define PM_GET_DEVICE_STATUS		3U
 #define PM_GET_OP_CHARACTERISTIC	4U
+#define PM_REGISTER_NOTIFIER		5U
 #define PM_REQ_SUSPEND			6U
 #define PM_SELF_SUSPEND			7U
 #define PM_FORCE_POWERDOWN		8U

plat/xilinx/versal/pm_service/pm_svc_main.c

@@ -338,6 +338,12 @@ uint64_t pm_smc_handler(uint32_t smc_fid, uint64_t x1, uint64_t x2, uint64_t x3,
 		SMC_RET1(handle, (uint64_t)ret);
 	}
 
+	case PM_REGISTER_NOTIFIER:
+	{
+		ret = pm_register_notifier(pm_arg[0], pm_arg[1], pm_arg[2], pm_arg[3]);
+		SMC_RET1(handle, (uint64_t)ret);
+	}
+
 	default:
 		WARN("Unimplemented PM Service Call: 0x%x\n", smc_fid);
 		SMC_RET1(handle, SMC_UNK);