firmware: imx: scu-irq: add imx_scu_irq_get_status

Extract the scu irq get status code from imx_scu_irq_work_handler and
make into a new function imx_scu_irq_get_status which could be used
by others, such as SECO.
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

drivers/firmware/imx/imx-scu-irq.c

 // SPDX-License-Identifier: GPL-2.0+
 /*
- * Copyright 2019 NXP
+ * Copyright 2019,2023 NXP
  *
  * Implementation of the SCU IRQ functions using MU.
  *
@@ -66,29 +66,18 @@ static int imx_scu_irq_notifier_call_chain(unsigned long status, u8 *group)
 
 static void imx_scu_irq_work_handler(struct work_struct *work)
 {
-	struct imx_sc_msg_irq_get_status msg;
-	struct imx_sc_rpc_msg *hdr = &msg.hdr;
 	u32 irq_status;
 	int ret;
 	u8 i;
 
 	for (i = 0; i < IMX_SC_IRQ_NUM_GROUP; i++) {
-		hdr->ver = IMX_SC_RPC_VERSION;
-		hdr->svc = IMX_SC_RPC_SVC_IRQ;
-		hdr->func = IMX_SC_IRQ_FUNC_STATUS;
-		hdr->size = 2;
-
-		msg.data.req.resource = mu_resource_id;
-		msg.data.req.group = i;
-
-		ret = imx_scu_call_rpc(imx_sc_irq_ipc_handle, &msg, true);
+		ret = imx_scu_irq_get_status(i, &irq_status);
 		if (ret) {
 			pr_err("get irq group %d status failed, ret %d\n",
 			       i, ret);
 			return;
 		}
 
-		irq_status = msg.data.resp.status;
 		if (!irq_status)
 			continue;
 
@@ -97,6 +86,31 @@ static void imx_scu_irq_work_handler(struct work_struct *work)
 	}
 }
 
+int imx_scu_irq_get_status(u8 group, u32 *irq_status)
+{
+	struct imx_sc_msg_irq_get_status msg;
+	struct imx_sc_rpc_msg *hdr = &msg.hdr;
+	int ret;
+
+	hdr->ver = IMX_SC_RPC_VERSION;
+	hdr->svc = IMX_SC_RPC_SVC_IRQ;
+	hdr->func = IMX_SC_IRQ_FUNC_STATUS;
+	hdr->size = 2;
+
+	msg.data.req.resource = mu_resource_id;
+	msg.data.req.group = group;
+
+	ret = imx_scu_call_rpc(imx_sc_irq_ipc_handle, &msg, true);
+	if (ret)
+		return ret;
+
+	if (irq_status)
+		*irq_status = msg.data.resp.status;
+
+	return 0;
+}
+EXPORT_SYMBOL(imx_scu_irq_get_status);
+
 int imx_scu_irq_group_enable(u8 group, u32 mask, u8 enable)
 {
 	struct imx_sc_msg_irq_enable msg;

include/linux/firmware/imx/sci.h

@@ -21,6 +21,7 @@ int imx_scu_enable_general_irq_channel(struct device *dev);
 int imx_scu_irq_register_notifier(struct notifier_block *nb);
 int imx_scu_irq_unregister_notifier(struct notifier_block *nb);
 int imx_scu_irq_group_enable(u8 group, u32 mask, u8 enable);
+int imx_scu_irq_get_status(u8 group, u32 *irq_status);
 int imx_scu_soc_init(struct device *dev);
 #else
 static inline int imx_scu_soc_init(struct device *dev)
@@ -47,5 +48,10 @@ static inline int imx_scu_irq_group_enable(u8 group, u32 mask, u8 enable)
 {
 	return -EOPNOTSUPP;
 }
+
+static inline int imx_scu_irq_get_status(u8 group, u32 *irq_status)
+{
+	return -EOPNOTSUPP;
+}
 #endif
 #endif /* _SC_SCI_H */