firmware: xilinx: Add system shutdown API interface

Add system shutdown API interface which asks firmware to
perform system shutdown/restart.

Signed-off-by: Rajan Vaja <rajan.vaja@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Jolly Shah <jolly.shah@xilinx.com>
Link: https://lore.kernel.org/r/1587761887-4279-24-git-send-email-jolly.shah@xilinx.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
index 2fe4f57c005a5339dd7bf44e3e348cccb2870996..9ba376cfc81f8caba89e695e754f94a688f02465 100644 (file)
--- a/drivers/firmware/xilinx/zynqmp.c
+++ b/drivers/firmware/xilinx/zynqmp.c
@@ -875,6 +875,19 @@ int zynqmp_pm_aes_engine(const u64 address, u32 *out)
 }
 EXPORT_SYMBOL_GPL(zynqmp_pm_aes_engine);
 
+/**
+ * zynqmp_pm_system_shutdown - PM call to request a system shutdown or restart
+ * @type:      Shutdown or restart? 0 for shutdown, 1 for restart
+ * @subtype:   Specifies which system should be restarted or shut down
+ *
+ * Return:     Returns status, either success or error+reason
+ */
+int zynqmp_pm_system_shutdown(const u32 type, const u32 subtype)
+{
+       return zynqmp_pm_invoke_fn(PM_SYSTEM_SHUTDOWN, type, subtype,
+                                  0, 0, NULL);
+}
+
 static ssize_t ggs_show(struct device *device,
                        struct device_attribute *attr,
                        char *buf,

diff --git a/include/linux/firmware/xlnx-zynqmp.h b/include/linux/firmware/xlnx-zynqmp.h
index c1356e93dcb24cf187425f8f53472a020f474ba8..2254c7cc33627a6177c86948bdccf76b2a15407a 100644 (file)
--- a/include/linux/firmware/xlnx-zynqmp.h
+++ b/include/linux/firmware/xlnx-zynqmp.h
@@ -64,6 +64,7 @@
 
 enum pm_api_id {
        PM_GET_API_VERSION = 1,
+       PM_SYSTEM_SHUTDOWN = 12,
        PM_REQUEST_NODE = 13,
        PM_RELEASE_NODE,
        PM_SET_REQUIREMENT,
@@ -340,6 +341,7 @@ int zynqmp_pm_write_ggs(u32 index, u32 value);
 int zynqmp_pm_read_ggs(u32 index, u32 *value);
 int zynqmp_pm_write_pggs(u32 index, u32 value);
 int zynqmp_pm_read_pggs(u32 index, u32 *value);
+int zynqmp_pm_system_shutdown(const u32 type, const u32 subtype);
 #else
 static inline struct zynqmp_eemi_ops *zynqmp_pm_get_eemi_ops(void)
 {
@@ -482,6 +484,10 @@ static inline int zynqmp_pm_read_pggs(u32 index, u32 *value)
 {
        return -ENODEV;
 }
+static inline int zynqmp_pm_system_shutdown(const u32 type, const u32 subtype)
+{
+       return -ENODEV;
+}
 #endif
 
 #endif /* __FIRMWARE_ZYNQMP_H__ */