Add support for PSCI SYSTEM_OFF and SYSTEM_RESET APIs

This patch adds support for SYSTEM_OFF and SYSTEM_RESET PSCI
operations. A platform should export handlers to complete the
requested operation. The FVP port exports fvp_system_off() and
fvp_system_reset() as an example.

If the SPD provides a power management hook for system off and
system reset, then the SPD is notified about the corresponding
operation so it can do some bookkeeping. The TSPD exports
tspd_system_off() and tspd_system_reset() for that purpose.

Versatile Express shutdown and reset methods have been removed
from the FDT as new PSCI sys_poweroff and sys_reset services
have been added. For those kernels that do not support yet these
PSCI services (i.e. GICv3 kernel), the original dtsi files have
been renamed to *-no_psci.dtsi.

Fixes ARM-software/tf-issues#218

Change-Id: Ic8a3bf801db979099ab7029162af041c4e8330c8

2 files changed, 53 insertions, 8 deletions

diff --git a/services/spd/tspd/tspd_main.c b/services/spd/tspd/tspd_main.c
index 22f302a2..b8d4569c 100644
--- a/services/spd/tspd/tspd_main.c
+++ b/services/spd/tspd/tspd_main.c
@@ -437,6 +437,8 @@ uint64_t tspd_smc_handler(uint32_t smc_fid,
 	 */
 	case TSP_OFF_DONE:
 	case TSP_SUSPEND_DONE:
+	case TSP_SYSTEM_OFF_DONE:
+	case TSP_SYSTEM_RESET_DONE:
 		if (ns)
 			SMC_RET1(handle, SMC_UNK);
 
diff --git a/services/spd/tspd/tspd_pm.c b/services/spd/tspd/tspd_pm.c
index e9e037a1..16552853 100644
--- a/services/spd/tspd/tspd_pm.c
+++ b/services/spd/tspd/tspd_pm.c
@@ -193,16 +193,59 @@ static int32_t tspd_cpu_migrate_info(uint64_t *resident_cpu)
 }
 
 /*******************************************************************************
+ * System is about to be switched off. Allow the TSPD/TSP to perform
+ * any actions needed.
+ ******************************************************************************/
+static void tspd_system_off(void)
+{
+	uint64_t mpidr = read_mpidr();
+	uint32_t linear_id = platform_get_core_pos(mpidr);
+	tsp_context_t *tsp_ctx = &tspd_sp_context[linear_id];
+
+	assert(tsp_vectors);
+	assert(get_tsp_pstate(tsp_ctx->state) == TSP_PSTATE_ON);
+
+	/* Program the entry point */
+	cm_set_elr_el3(SECURE, (uint64_t) &tsp_vectors->system_off_entry);
+
+	/* Enter the TSP. We do not care about the return value because we
+	 * must continue the shutdown anyway */
+	tspd_synchronous_sp_entry(tsp_ctx);
+}
+
+/*******************************************************************************
+ * System is about to be reset. Allow the TSPD/TSP to perform
+ * any actions needed.
+ ******************************************************************************/
+static void tspd_system_reset(void)
+{
+	uint64_t mpidr = read_mpidr();
+	uint32_t linear_id = platform_get_core_pos(mpidr);
+	tsp_context_t *tsp_ctx = &tspd_sp_context[linear_id];
+
+	assert(tsp_vectors);
+	assert(get_tsp_pstate(tsp_ctx->state) == TSP_PSTATE_ON);
+
+	/* Program the entry point */
+	cm_set_elr_el3(SECURE, (uint64_t) &tsp_vectors->system_reset_entry);
+
+	/* Enter the TSP. We do not care about the return value because we
+	 * must continue the reset anyway */
+	tspd_synchronous_sp_entry(tsp_ctx);
+}
+
+/*******************************************************************************
  * Structure populated by the TSP Dispatcher to be given a chance to perform any
  * TSP bookkeeping before PSCI executes a power mgmt.  operation.
  ******************************************************************************/
 const spd_pm_ops_t tspd_pm = {
-	tspd_cpu_on_handler,
-	tspd_cpu_off_handler,
-	tspd_cpu_suspend_handler,
-	tspd_cpu_on_finish_handler,
-	tspd_cpu_suspend_finish_handler,
-	NULL,
-	tspd_cpu_migrate_info
+	.svc_on = tspd_cpu_on_handler,
+	.svc_off = tspd_cpu_off_handler,
+	.svc_suspend = tspd_cpu_suspend_handler,
+	.svc_on_finish = tspd_cpu_on_finish_handler,
+	.svc_suspend_finish = tspd_cpu_suspend_finish_handler,
+	.svc_migrate = NULL,
+	.svc_migrate_info = tspd_cpu_migrate_info,
+	.svc_system_off = tspd_system_off,
+	.svc_system_reset = tspd_system_reset
 };
-