ti: k3: common: Add PSCI stubs

These functions are used for the PSCI implementation and are needed to
build BL31, but we cannot implement them until we add several more drivers
related to ti-sci so these are only stubs for now.

Signed-off-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Benjamin Fair <b-fair@ti.com>
Signed-off-by: Andrew F. Davis <afd@ti.com>

2 files changed, 100 insertions, 0 deletions

diff --git a/plat/ti/k3/common/k3_psci.c b/plat/ti/k3/common/k3_psci.c
new file mode 100644
index 000000000..91602c8c1
--- /dev/null
+++ b/plat/ti/k3/common/k3_psci.c
@@ -0,0 +1,95 @@
+/*
+ * Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch_helpers.h>
+#include <assert.h>
+#include <debug.h>
+#include <k3_gicv3.h>
+#include <psci.h>
+#include <stdbool.h>
+
+#define STUB() ERROR("stub %s called\n", __func__)
+
+uintptr_t k3_sec_entrypoint;
+
+static void k3_cpu_standby(plat_local_state_t cpu_state)
+{
+	/*
+	 * Enter standby state
+	 * dsb is good practice before using wfi to enter low power states
+	 */
+	dsb();
+	wfi();
+}
+
+static int k3_pwr_domain_on(u_register_t mpidr)
+{
+	sev();
+
+	/* TODO: Indicate to System firmware about powering up */
+
+	return PSCI_E_SUCCESS;
+}
+
+void k3_pwr_domain_off(const psci_power_state_t *target_state)
+{
+	/* Prevent interrupts from spuriously waking up this cpu */
+	k3_gic_cpuif_disable();
+
+	/* TODO: Indicate to System firmware about powering down */
+}
+
+void k3_pwr_domain_on_finish(const psci_power_state_t *target_state)
+{
+	/* TODO: Indicate to System firmware about completion */
+
+	k3_gic_pcpu_init();
+	k3_gic_cpuif_enable();
+}
+
+static void __dead2 k3_system_reset(void)
+{
+	/* TODO: Indicate to System firmware about system reset */
+	STUB();
+
+	while (true)
+		wfi();
+}
+
+static int k3_validate_power_state(unsigned int power_state,
+				   psci_power_state_t *req_state)
+{
+	/* TODO: perform the proper validation */
+
+	return PSCI_E_SUCCESS;
+}
+
+static int k3_validate_ns_entrypoint(uintptr_t entrypoint)
+{
+	/* TODO: perform the proper validation */
+
+	return PSCI_E_SUCCESS;
+}
+
+static const plat_psci_ops_t k3_plat_psci_ops = {
+	.cpu_standby = k3_cpu_standby,
+	.pwr_domain_on = k3_pwr_domain_on,
+	.pwr_domain_off = k3_pwr_domain_off,
+	.pwr_domain_on_finish = k3_pwr_domain_on_finish,
+	.system_reset = k3_system_reset,
+	.validate_power_state = k3_validate_power_state,
+	.validate_ns_entrypoint = k3_validate_ns_entrypoint
+};
+
+int plat_setup_psci_ops(uintptr_t sec_entrypoint,
+			const plat_psci_ops_t **psci_ops)
+{
+	k3_sec_entrypoint = sec_entrypoint;
+
+	*psci_ops = &k3_plat_psci_ops;
+
+	return 0;
+}
diff --git a/plat/ti/k3/common/plat_common.mk b/plat/ti/k3/common/plat_common.mk
index 0c153f746..bf2a73fbb 100644
--- a/plat/ti/k3/common/plat_common.mk
+++ b/plat/ti/k3/common/plat_common.mk
@@ -49,6 +49,10 @@ K3_GIC_SOURCES		+=	\
 				plat/common/plat_gicv3.c		\
 				${PLAT_PATH}/common/k3_gicv3.c		\
 
+K3_PSCI_SOURCES		+=	\
+				plat/common/plat_psci_common.c		\
+				${PLAT_PATH}/common/k3_psci.c		\
+
 PLAT_BL_COMMON_SOURCES	+=	\
 				plat/arm/common/arm_common.c		\
 				lib/cpus/aarch64/cortex_a53.S		\
@@ -60,3 +64,4 @@ BL31_SOURCES		+=	\
 				${PLAT_PATH}/common/k3_helpers.S	\
 				${PLAT_PATH}/common/k3_topology.c	\
 				${K3_GIC_SOURCES}			\
+				${K3_PSCI_SOURCES}			\