[PATCH v7 1/6] firmware: xilinx: add register notifier in zynqmp firmware

[Abhyuday Godhasara]

In zynqmp-firmware, register notifier is not supported, add support of
register notifier in zynqmp-firmware.

Signed-off-by: Tejas Patel <tejas.patel@xxxxxxxxxx>
Signed-off-by: Abhyuday Godhasara <abhyuday.godhasara@xxxxxxxxxx>
Acked-by: Michal Simek <michal.simek@xxxxxxxxxx>
---
Changes in v7:
- Update the version history.

Changes in v6:
- The body of the zynqmp_pm_load_pdi was missing in v5 due to force merge
  during rebase and getting compilation failure when Xilinx Event management
  driver is disabled. So, add/correct the line of code missing.

Changes in v5:
- None

Changes in v4:
- Rebase on latest tree

Changes in v3:
- None

Changes in v2:
- Removed updated copyright year from unchanged files.
---
 drivers/firmware/xilinx/zynqmp.c     | 23 +++++++++++++++++++++++
 include/linux/firmware/xlnx-zynqmp.h | 11 ++++++++++-
 2 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
index a3cadbaf3cba..6e653e9cea2d 100644
--- a/drivers/firmware/xilinx/zynqmp.c
+++ b/drivers/firmware/xilinx/zynqmp.c
@@ -1053,6 +1053,29 @@ int zynqmp_pm_aes_engine(const u64 address, u32 *out)
 }
 EXPORT_SYMBOL_GPL(zynqmp_pm_aes_engine);
 
+/**
+ * zynqmp_pm_register_notifier() - PM API for register a subsystem
+ *                                to be notified about specific
+ *                                event/error.
+ * @node:	Node ID to which the event is related.
+ * @event:	Event Mask of Error events for which wants to get notified.
+ * @wake:	Wake subsystem upon capturing the event if value 1
+ * @enable:	Enable the registration for value 1, disable for value 0
+ *
+ * This function is used to register/un-register for particular node-event
+ * combination in firmware.
+ *
+ * Return: Returns status, either success or error+reason
+ */
+
+int zynqmp_pm_register_notifier(const u32 node, const u32 event,
+				const u32 wake, const u32 enable)
+{
+	return zynqmp_pm_invoke_fn(PM_REGISTER_NOTIFIER, node, event,
+				   wake, enable, NULL);
+}
+EXPORT_SYMBOL_GPL(zynqmp_pm_register_notifier);
+
 /**
  * zynqmp_pm_system_shutdown - PM call to request a system shutdown or restart
  * @type:	Shutdown or restart? 0 for shutdown, 1 for restart
diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
index 56b426fe020c..96aaadc44c3f 100644
--- a/include/linux/firmware/xlnx-zynqmp.h
+++ b/include/linux/firmware/xlnx-zynqmp.h
@@ -2,7 +2,7 @@
 /*
  * Xilinx Zynq MPSoC Firmware layer
  *
- *  Copyright (C) 2014-2019 Xilinx
+ *  Copyright (C) 2014-2021 Xilinx
  *
  *  Michal Simek <michal.simek@xxxxxxxxxx>
  *  Davorin Mista <davorin.mista@xxxxxxxxxx>
@@ -66,6 +66,7 @@
 
 enum pm_api_id {
 	PM_GET_API_VERSION = 1,
+	PM_REGISTER_NOTIFIER = 5,
 	PM_SYSTEM_SHUTDOWN = 12,
 	PM_REQUEST_NODE = 13,
 	PM_RELEASE_NODE = 14,
@@ -416,6 +417,8 @@ int zynqmp_pm_pinctrl_get_config(const u32 pin, const u32 param,
 int zynqmp_pm_pinctrl_set_config(const u32 pin, const u32 param,
 				 u32 value);
 int zynqmp_pm_load_pdi(const u32 src, const u64 address);
+int zynqmp_pm_register_notifier(const u32 node, const u32 event,
+				const u32 wake, const u32 enable);
 #else
 static inline int zynqmp_pm_get_api_version(u32 *version)
 {
@@ -632,6 +635,12 @@ static inline int zynqmp_pm_load_pdi(const u32 src, const u64 address)
 {
 	return -ENODEV;
 }
+
+static inline int zynqmp_pm_register_notifier(const u32 node, const u32 event,
+					      const u32 wake, const u32 enable)
+{
+	return -ENODEV;
+}
 #endif
 
 #endif /* __FIRMWARE_ZYNQMP_H__ */
-- 
2.32.0.93.g670b81a