linux-kernel - [PATCH 4/7] firmware: imx: scu-irq: Add API to retrieve status of IRQ

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Date:   Mon, 20 Jul 2020 11:06:14 +0200
From:   franck.lenormand@....nxp.com
To:     shawnguo@...nel.org, s.hauer@...gutronix.de, festevam@...il.com
Cc:     franck.lenormand@....nxp.com, kernel@...gutronix.de,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-imx@....com, aisheng.dong@....com, abel.vesa@....com,
        Anson.Huang@....com, linux@...pel-privat.de,
        leonard.crestez@....com, daniel.baluta@....com,
        qiangqing.zhang@....com, peng.fan@....com
Subject: [PATCH 4/7] firmware: imx: scu-irq: Add API to retrieve status of IRQ

From: Franck LENORMAND <franck.lenormand@....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@....nxp.com>
---
 drivers/firmware/imx/imx-scu-irq.c | 37 ++++++++++++++++++++++++++++++++++++-
 include/linux/firmware/imx/sci.h   |  4 ++++
 2 files changed, 40 insertions(+), 1 deletion(-)

diff --git a/drivers/firmware/imx/imx-scu-irq.c b/drivers/firmware/imx/imx-scu-irq.c
index db655e8..4de6486 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.
  *
@@ -95,6 +95,41 @@ 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:
+ * 0 - OK
+ * < 0 - error.
+ */
+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 97245e5..a27d069 100644
--- a/include/linux/firmware/imx/sci.h
+++ b/include/linux/firmware/imx/sci.h
@@ -17,8 +17,12 @@
 #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_irq_get_status(u8 group, u32 *irq_status);
 #endif /* _SC_SCI_H */
-- 
2.7.4