GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

source/trusted-firmware/trusted-firmware-a-2.8/services/spd/tlkd/tlkd_pm.c

@@ -0,0 +1,109 @@
+/*
+ * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2020, NVIDIA Corporation. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+
+#include <arch_helpers.h>
+#include <bl32/payloads/tlk.h>
+#include <common/bl_common.h>
+#include <common/debug.h>
+#include <lib/el3_runtime/context_mgmt.h>
+#include <lib/psci/psci.h>
+
+#include "tlkd_private.h"
+
+extern tlk_context_t tlk_ctx;
+
+#define MPIDR_CPU0	0x80000000
+
+/*******************************************************************************
+ * Return the type of payload TLKD is dealing with. Report the current
+ * resident cpu (mpidr format) if it is a UP/UP migratable payload.
+ ******************************************************************************/
+static int32_t cpu_migrate_info(u_register_t *resident_cpu)
+{
+	/* the payload runs only on CPU0 */
+	*resident_cpu = MPIDR_CPU0;
+
+	/* Uniprocessor, not migrate capable payload */
+	return PSCI_TOS_NOT_UP_MIG_CAP;
+}
+
+/*******************************************************************************
+ * This cpu is being suspended. Inform TLK of the SYSTEM_SUSPEND event, so
+ * that it can pass this information to its Trusted Apps.
+ ******************************************************************************/
+static void cpu_suspend_handler(u_register_t suspend_level)
+{
+	gp_regs_t *gp_regs;
+	int cpu = read_mpidr() & MPIDR_CPU_MASK;
+	int32_t rc = 0;
+
+	/*
+	 * TLK runs only on CPU0 and suspends its Trusted Apps during
+	 * SYSTEM_SUSPEND. It has no role to play during CPU_SUSPEND.
+	 */
+	if ((cpu != 0) || (suspend_level != PLAT_MAX_PWR_LVL))
+		return;
+
+	/* pass system suspend event to TLK */
+	gp_regs = get_gpregs_ctx(&tlk_ctx.cpu_ctx);
+	write_ctx_reg(gp_regs, CTX_GPREG_X0, TLK_SYSTEM_SUSPEND);
+
+	/* Program the entry point and enter TLK */
+	rc = tlkd_synchronous_sp_entry(&tlk_ctx);
+
+	/*
+	 * Read the response from TLK. A non-zero return means that
+	 * something went wrong while communicating with it.
+	 */
+	if (rc != 0)
+		panic();
+}
+
+/*******************************************************************************
+ * This cpu is being resumed. Inform TLK of the SYSTEM_SUSPEND exit, so
+ * that it can pass this information to its Trusted Apps.
+ ******************************************************************************/
+static void cpu_resume_handler(u_register_t suspend_level)
+{
+	gp_regs_t *gp_regs;
+	int cpu = read_mpidr() & MPIDR_CPU_MASK;
+	int32_t rc = 0;
+
+	/*
+	 * TLK runs only on CPU0 and resumes its Trusted Apps during
+	 * SYSTEM_SUSPEND exit. It has no role to play during CPU_SUSPEND
+	 * exit.
+	 */
+	if ((cpu != 0) || (suspend_level != PLAT_MAX_PWR_LVL))
+		return;
+
+	/* pass system resume event to TLK */
+	gp_regs = get_gpregs_ctx(&tlk_ctx.cpu_ctx);
+	write_ctx_reg(gp_regs, CTX_GPREG_X0, TLK_SYSTEM_RESUME);
+
+	/* Program the entry point and enter TLK */
+	rc = tlkd_synchronous_sp_entry(&tlk_ctx);
+
+	/*
+	 * Read the response from TLK. A non-zero return means that
+	 * something went wrong while communicating with it.
+	 */
+	if (rc != 0)
+		panic();
+}
+
+/*******************************************************************************
+ * Structure populated by the Dispatcher to be given a chance to perform any
+ * bookkeeping before PSCI executes a power mgmt.  operation.
+ ******************************************************************************/
+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,
+};