1 files changed, 78 insertions, 0 deletions
diff --git a/plat/arm/board/juno/juno_pm.c b/plat/arm/board/juno/juno_pm.c
new file mode 100644
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+++ b/plat/arm/board/juno/juno_pm.c
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+/*
+ * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * Neither the name of ARM nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without specific
+ * prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+#include <css_pm.h>
+#include <plat_arm.h>
+
+/*
+ * Custom `validate_power_state` handler for Juno. According to PSCI
+ * Specification, interrupts targeted to cores in PSCI CPU SUSPEND should
+ * be able to resume it. On Juno, when the system power domain is suspended,
+ * the GIC is also powered down. The SCP resumes the final core to be suspend
+ * when an external wake-up event is received. But the other cores cannot be
+ * woken up by a targeted interrupt, because GIC doesn't forward these
+ * interrupts to the SCP. Due to this hardware limitation, we down-grade PSCI
+ * CPU SUSPEND requests targeted to the system power domain level
+ * to cluster power domain level.
+ *
+ * The system power domain suspend on Juno is only supported only via
+ * PSCI SYSTEM SUSPEND API.
+ */
+static int juno_validate_power_state(unsigned int power_state,
+			    psci_power_state_t *req_state)
+{
+	int rc;
+	rc = arm_validate_power_state(power_state, req_state);
+
+	/*
+	 * Ensure that the system power domain level is never suspended
+	 * via PSCI CPU SUSPEND API. Currently system suspend is only
+	 * supported via PSCI SYSTEM SUSPEND API.
+	 */
+	req_state->pwr_domain_state[ARM_PWR_LVL2] = ARM_LOCAL_STATE_RUN;
+	return rc;
+}
+
+/*******************************************************************************
+ * Export the platform handlers via plat_arm_psci_pm_ops. The ARM Standard
+ * platform will take care of registering the handlers with PSCI.
+ ******************************************************************************/
+const plat_psci_ops_t plat_arm_psci_pm_ops = {
+	.pwr_domain_on			= css_pwr_domain_on,
+	.pwr_domain_on_finish		= css_pwr_domain_on_finish,
+	.pwr_domain_off			= css_pwr_domain_off,
+	.cpu_standby			= css_cpu_standby,
+	.pwr_domain_suspend		= css_pwr_domain_suspend,
+	.pwr_domain_suspend_finish	= css_pwr_domain_suspend_finish,
+	.system_off			= css_system_off,
+	.system_reset			= css_system_reset,
+	.validate_power_state		= juno_validate_power_state,
+	.validate_ns_entrypoint		= arm_validate_ns_entrypoint,
+	.get_sys_suspend_power_state	= css_get_sys_suspend_power_state
+};