tlkd: remove system off/reset handlers

TLK does not participate in the system off/reset process and so
has no use for the SYSTEM_OFF/RESET notifications.

This patch removes the system off/reset handlers as a result.

Change-Id: Icf1430b1400cea88000e6d54426eb604a43cbe6c
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>

include/bl32/payloads/tlk.h

 /*
  * Copyright (c) 2015-2018, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2020, NVIDIA Corporation. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -26,7 +27,6 @@
 #define TLK_RESUME_FID		TLK_TOS_YIELD_FID(0x100)
 #define TLK_SYSTEM_SUSPEND	TLK_TOS_YIELD_FID(0xE001)
 #define TLK_SYSTEM_RESUME	TLK_TOS_YIELD_FID(0xE002)
-#define TLK_SYSTEM_OFF		TLK_TOS_YIELD_FID(0xE003)
 #define TLK_IRQ_FIRED		TLK_TOS_YIELD_FID(0xE004)
 
 /*
@@ -39,7 +39,6 @@
 #define TLK_VA_TRANSLATE	(0x32000004 | (ULL(1) << 31))
 #define TLK_SUSPEND_DONE	(0x32000005 | (ULL(1) << 31))
 #define TLK_RESUME_DONE		(0x32000006 | (ULL(1) << 31))
-#define TLK_SYSTEM_OFF_DONE	(0x32000007 | (ULL(1) << 31))
 #define TLK_IRQ_DONE		(0x32000008 | (ULL(1) << 31))
 
 /*

services/spd/tlkd/tlkd_main.c

 /*
  * Copyright (c) 2015-2020, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2020, NVIDIA Corporation. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -429,7 +430,6 @@ static uintptr_t tlkd_smc_handler(uint32_t smc_fid,
 	 */
 	case TLK_SUSPEND_DONE:
 	case TLK_RESUME_DONE:
-	case TLK_SYSTEM_OFF_DONE:
 
 		if (ns)
 			SMC_RET1(handle, SMC_UNK);

services/spd/tlkd/tlkd_pm.c

 /*
  * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2020, NVIDIA Corporation. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -97,29 +98,6 @@ static void cpu_resume_handler(u_register_t suspend_level)
 		panic();
 }
 
-/*******************************************************************************
- * System is about to be reset. Inform the SP to allow any book-keeping
- ******************************************************************************/
-static void system_off_handler(void)
-{
-	int cpu = read_mpidr() & MPIDR_CPU_MASK;
-	gp_regs_t *gp_regs;
-
-	/* TLK runs only on CPU0 */
-	if (cpu != 0)
-		return;
-
-	/* pass system off/reset events to TLK */
-	gp_regs = get_gpregs_ctx(&tlk_ctx.cpu_ctx);
-	write_ctx_reg(gp_regs, CTX_GPREG_X0, TLK_SYSTEM_OFF);
-
-	/*
-	 * Enter the SP. We do not care about the return value because we
-	 * must continue with the shutdown anyway.
-	 */
-	(void)tlkd_synchronous_sp_entry(&tlk_ctx);
-}
-
 /*******************************************************************************
  * Structure populated by the Dispatcher to be given a chance to perform any
  * bookkeeping before PSCI executes a power mgmt.  operation.
@@ -128,6 +106,4 @@ const spd_pm_ops_t tlkd_pm_ops = {
 	.svc_migrate_info = cpu_migrate_info,
 	.svc_suspend = cpu_suspend_handler,
 	.svc_suspend_finish = cpu_resume_handler,
-	.svc_system_off = system_off_handler,
-	.svc_system_reset = system_off_handler
 };