[PATCH v4 2/5] firmware: imx: scu-irq: Add API to retrieve status of IRQ

[franck.lenormand at oss.nxp.com]

From: Franck LENORMAND <franck.lenormand at oss.nxp.com>

This patch adds the API to retrieve the status of an IRQ.

It also adds values used to process SECVIO IRQ from the SCU.

Signed-off-by: Franck LENORMAND <franck.lenormand at nxp.com>
---
 drivers/firmware/imx/imx-scu-irq.c | 48 +++++++++++++++++++++++++++-----------
 include/linux/firmware/imx/sci.h   |  4 ++++
 2 files changed, 39 insertions(+), 13 deletions(-)

diff --git a/drivers/firmware/imx/imx-scu-irq.c b/drivers/firmware/imx/imx-scu-irq.c
index d9dcc20..bb0b5aa 100644
--- a/drivers/firmware/imx/imx-scu-irq.c
+++ b/drivers/firmware/imx/imx-scu-irq.c
@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0+
 /*
- * Copyright 2019 NXP
+ * Copyright 2019-2020 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 +86,39 @@ static void imx_scu_irq_work_handler(struct work_struct *work)
 	}
 }
 
+/**
+ * imx_scu_irq_get_status() - Get the status of the IRQs of a group
+ *
+ * @group: The group of IRQ to retrieve status
+ * @irq_status: Status of the IRQs retrieved
+ *
+ * @return Returns 0 for success and < 0 for errors
+ */
+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;
diff --git a/include/linux/firmware/imx/sci.h b/include/linux/firmware/imx/sci.h
index 914dce1..20a16a7 100644
--- a/include/linux/firmware/imx/sci.h
+++ b/include/linux/firmware/imx/sci.h
@@ -17,9 +17,13 @@
 #include <linux/firmware/imx/svc/rm.h>
 #include <linux/firmware/imx/svc/seco.h>
 
+#define IMX_SC_IRQ_GROUP_WAKE       3U /* Wakeup interrupts */
+#define IMX_SC_IRQ_SECVIO            BIT(6)    /* Security violation */
+
 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_soc_init(struct device *dev);
+int imx_scu_irq_get_status(u8 group, u32 *irq_status);
 #endif /* _SC_SCI_H */
-- 
2.7.4