firmware: xilinx: Add support for runtime features

Add support for runtime features by using an IOCTL call. The features
 can be enabled or disabled from the firmware as well as the features
 can be configured at runtime by querying IOCTL_SET_FEATURE_CONFIG id.
 Similarly, the user can get the configured values of features by
 querying IOCTL_GET_FEATURE_CONFIG id.

Acked-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Ronak Jain <ronak.jain@xilinx.com>
Link: https://lore.kernel.org/r/20220209082709.32378-2-ronak.jain@xilinx.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 27 insertions, 0 deletions

diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
index 450c5f6a1cbf..0fa6cae4969d 100644
--- a/drivers/firmware/xilinx/zynqmp.c
+++ b/drivers/firmware/xilinx/zynqmp.c
@@ -1157,6 +1157,33 @@ int zynqmp_pm_system_shutdown(const u32 type, const u32 subtype)
 }
 
 /**
+ * zynqmp_pm_set_feature_config - PM call to request IOCTL for feature config
+ * @id:         The config ID of the feature to be configured
+ * @value:      The config value of the feature to be configured
+ *
+ * Return:      Returns 0 on success or error value on failure.
+ */
+int zynqmp_pm_set_feature_config(enum pm_feature_config_id id, u32 value)
+{
+	return zynqmp_pm_invoke_fn(PM_IOCTL, 0, IOCTL_SET_FEATURE_CONFIG,
+				   id, value, NULL);
+}
+
+/**
+ * zynqmp_pm_get_feature_config - PM call to get value of configured feature
+ * @id:         The config id of the feature to be queried
+ * @payload:    Returned value array
+ *
+ * Return:      Returns 0 on success or error value on failure.
+ */
+int zynqmp_pm_get_feature_config(enum pm_feature_config_id id,
+				 u32 *payload)
+{
+	return zynqmp_pm_invoke_fn(PM_IOCTL, 0, IOCTL_GET_FEATURE_CONFIG,
+				   id, 0, payload);
+}
+
+/**
  * struct zynqmp_pm_shutdown_scope - Struct for shutdown scope
  * @subtype:	Shutdown subtype
  * @name:	Matching string for scope argument