Tegra194: mce: support for shutdown and reboot

This patch adds support for shutdown/reboot handlers to the MCE
driver.

ATF communicates with mce using nvg interface for shutdown &
reboot. Both shutdown and reboot use the same nvg index.
However, the 1st bit of the nvg data argument differentiates
whether its a shutdown or reboot.

Change-Id: Id2d1b0c4fec55abf69b7f8adb65ca70bfa920e73
Signed-off-by: Vignesh Radhakrishnan <vigneshr@nvidia.com>

plat/nvidia/tegra/soc/t194/drivers/include/mce_private.h

@@ -7,6 +7,7 @@
 #ifndef MCE_PRIVATE_H
 #define MCE_PRIVATE_H
 
+#include <stdbool.h>
 #include <tegra_def.h>
 
 /*******************************************************************************
@@ -67,8 +68,12 @@ uint64_t nvg_cache_clean(void);
 uint64_t nvg_cache_clean_inval(void);
 uint64_t nvg_cache_inval_all(void);
 void nvg_enable_strict_checking_mode(void);
+void nvg_system_shutdown(void);
+void nvg_system_reboot(void);
 
 /* MCE helper functions */
 void mce_enable_strict_checking(void);
+void mce_system_shutdown(void);
+void mce_system_reboot(void);
 
 #endif /* MCE_PRIVATE_H */

plat/nvidia/tegra/soc/t194/drivers/include/t194_nvg.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2019, NVIDIA CORPORATION. All rights reserved.
+ * Copyright (c) 2019-2020, NVIDIA CORPORATION. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -128,6 +128,11 @@ typedef enum {
 	TEGRA_NVG_SYSTEM_SC8 = 8
 } tegra_nvg_system_sleep_state_t;
 
+typedef enum {
+    TEGRA_NVG_SHUTDOWN = 0U,
+    TEGRA_NVG_REBOOT = 1U,
+} tegra_nvg_shutdown_reboot_state_t;
+
 // ---------------------------------------------------------------------------
 // NVG Data subformats
 // ---------------------------------------------------------------------------

plat/nvidia/tegra/soc/t194/drivers/mce/mce.c

@@ -237,3 +237,19 @@ void mce_enable_strict_checking(void)
 	}
 }
 #endif
+
+/*******************************************************************************
+ * Handler to power down the entire system
+ ******************************************************************************/
+void mce_system_shutdown(void)
+{
+	nvg_system_shutdown();
+}
+
+/*******************************************************************************
+ * Handler to reboot the entire system
+ ******************************************************************************/
+void mce_system_reboot(void)
+{
+	nvg_system_reboot();
+}

plat/nvidia/tegra/soc/t194/drivers/mce/nvg.c

@@ -302,3 +302,25 @@ void nvg_enable_strict_checking_mode(void)
 	nvg_set_request_data(TEGRA_NVG_CHANNEL_SECURITY_CONFIG, params);
 }
 #endif
+
+/*
+ * Request a reboot
+ *
+ * NVGDATA[0]: reboot command
+ */
+void nvg_system_reboot(void)
+{
+	/* issue command for reboot */
+	nvg_set_request_data(TEGRA_NVG_CHANNEL_SHUTDOWN, TEGRA_NVG_REBOOT);
+}
+
+/*
+ * Request a shutdown
+ *
+ * NVGDATA[0]: shutdown command
+ */
+void nvg_system_shutdown(void)
+{
+	/* issue command for shutdown */
+	nvg_set_request_data(TEGRA_NVG_CHANNEL_SHUTDOWN, TEGRA_NVG_SHUTDOWN);
+}