xilinx: versal: Add PSCI APIs for system shutdown & reset

Add following APIs in plat_psci to support system shutdown & reset:
- versal_system_off
- versal_system_reset

Signed-off-by: Saeed Nowshadi <saeed.nowshadi@xilinx.com>
Signed-off-by: Jolly Shah <jolly.shah@xilinx.com>
Change-Id: Ia2c1a19ded18984b393e1fdee760bf48b45e9902

plat/xilinx/versal/plat_psci.c

@@ -12,6 +12,7 @@
 #include <lib/mmio.h>
 #include <lib/psci/psci.h>
 #include <plat/common/platform.h>
+#include <plat/arm/common/plat_arm.h>
 
 #include "pm_api_sys.h"
 #include "pm_client.h"
@@ -114,6 +115,34 @@ void versal_pwr_domain_on_finish(const psci_power_state_t *target_state)
 	plat_versal_gic_cpuif_enable();
 }
 
+/**
+ * versal_system_off() - This function sends the system off request
+ * to firmware.  This function does not return.
+ */
+static void __dead2 versal_system_off(void)
+{
+	/* Send the power down request to the PMC */
+	pm_system_shutdown(XPM_SHUTDOWN_TYPE_SHUTDOWN,
+			  pm_get_shutdown_scope());
+
+	while (1)
+		wfi();
+}
+
+/**
+ * versal_system_reset() - This function sends the reset request
+ * to firmware for the system to reset.  This function does not return.
+ */
+static void __dead2 versal_system_reset(void)
+{
+	/* Send the system reset request to the PMC */
+	pm_system_shutdown(XPM_SHUTDOWN_TYPE_RESET,
+			  pm_get_shutdown_scope());
+
+	while (1)
+		wfi();
+}
+
 /**
  * versal_pwr_domain_off() - This function performs actions to turn off core
  *
@@ -190,6 +219,8 @@ static const struct plat_psci_ops versal_nopmc_psci_ops = {
 	.pwr_domain_on_finish		= versal_pwr_domain_on_finish,
 	.pwr_domain_suspend		= versal_pwr_domain_suspend,
 	.pwr_domain_suspend_finish	= versal_pwr_domain_suspend_finish,
+	.system_off			= versal_system_off,
+	.system_reset			= versal_system_reset,
 	.validate_power_state		= versal_validate_power_state,
 	.get_sys_suspend_power_state	= versal_get_sys_suspend_power_state,
 };

plat/xilinx/versal/pm_service/pm_api_sys.c

@@ -21,6 +21,19 @@
 #define LIBPM_MODULE_ID		0x2
 #define LOADER_MODULE_ID	0x7
 
+/* default shutdown/reboot scope is system(2) */
+static unsigned int pm_shutdown_scope = XPM_SHUTDOWN_SUBTYPE_RST_SYSTEM;
+
+/**
+ * pm_get_shutdown_scope() - Get the currently set shutdown scope
+ *
+ * @return	Shutdown scope value
+ */
+unsigned int pm_get_shutdown_scope(void)
+{
+	return pm_shutdown_scope;
+}
+
 /**
  * Assigning of argument values into array elements.
  */
@@ -625,7 +638,7 @@ enum pm_ret_status pm_force_powerdown(uint32_t target, uint8_t ack)
 
 /**
  * pm_system_shutdown() - PM call to request a system shutdown or restart
- * @type	Shutdown or restart? 0=shutdown, 1=restart
+ * @type	Shutdown or restart? 0=shutdown, 1=restart, 2=setscope
  * @subtype	Scope: 0=APU-subsystem, 1=PS, 2=system
  *
  * @return	Returns status, either success or error+reason
@@ -634,6 +647,12 @@ enum pm_ret_status pm_system_shutdown(uint32_t type, uint32_t subtype)
 {
 	uint32_t payload[PAYLOAD_ARG_CNT];
 
+	if (type == XPM_SHUTDOWN_TYPE_SETSCOPE_ONLY) {
+		/* Setting scope for subsequent PSCI reboot or shutdown */
+		pm_shutdown_scope = subtype;
+		return PM_RET_SUCCESS;
+	}
+
 	/* Send request to the PMC */
 	PM_PACK_PAYLOAD3(payload, LIBPM_MODULE_ID, PM_SYSTEM_SHUTDOWN, type,
 			 subtype);

plat/xilinx/versal/pm_service/pm_api_sys.h

@@ -63,4 +63,6 @@ enum pm_ret_status pm_api_ioctl(uint32_t device_id, uint32_t ioctl_id,
 				uint32_t arg1, uint32_t arg2, uint32_t *value);
 enum pm_ret_status pm_query_data(uint32_t qid, uint32_t arg1, uint32_t arg2,
 				 uint32_t arg3, uint32_t *data);
+unsigned int pm_get_shutdown_scope(void);
+
 #endif /* PM_API_SYS_H */

plat/xilinx/versal/pm_service/pm_defs.h

@@ -77,6 +77,15 @@
 /* Fractional data portion for PLL */
 #define PM_PLL_PARAM_DATA	2
 
+/* System shutdown macros */
+#define	XPM_SHUTDOWN_TYPE_SHUTDOWN	0U
+#define	XPM_SHUTDOWN_TYPE_RESET		1U
+#define	XPM_SHUTDOWN_TYPE_SETSCOPE_ONLY	2U
+
+#define	XPM_SHUTDOWN_SUBTYPE_RST_SUBSYSTEM	0U
+#define	XPM_SHUTDOWN_SUBTYPE_RST_PS_ONLY	1U
+#define	XPM_SHUTDOWN_SUBTYPE_RST_SYSTEM		2U
+
 /*********************************************************************
  * Enum definitions
  ********************************************************************/