plat_psci_handlers.c

/*
 * 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
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <arch.h>
#include <arch_helpers.h>
#include <debug.h>
#include <mce.h>
#include <psci.h>
#include <tegra_private.h>

int32_t tegra_soc_validate_power_state(unsigned int power_state)
{
	/* Sanity check the requested afflvl */
	if (psci_get_pstate_type(power_state) == PSTATE_TYPE_STANDBY) {
		/*
		 * It's possible to enter standby only on affinity level 0 i.e.
		 * a cpu on Tegra. Ignore any other affinity level.
		 */
		if (psci_get_pstate_afflvl(power_state) != MPIDR_AFFLVL0)
			return PSCI_E_INVALID_PARAMS;
	}

	return PSCI_E_SUCCESS;
}

int tegra_soc_prepare_cpu_on(unsigned long mpidr)
{
	int target_cpu = mpidr & MPIDR_CPU_MASK;
	int target_cluster = (mpidr & MPIDR_CLUSTER_MASK) >>
			MPIDR_AFFINITY_BITS;

	if (target_cluster > MPIDR_AFFLVL1) {
		ERROR("%s: unsupported CPU (0x%lx)\n", __func__, mpidr);
		return PSCI_E_NOT_PRESENT;
	}

	/* construct the target CPU # */
	target_cpu |= (target_cluster << 2);

	mce_command_handler(MCE_CMD_ONLINE_CORE, target_cpu, 0, 0);

	return PSCI_E_SUCCESS;
}

int tegra_soc_prepare_cpu_on_finish(unsigned long mpidr)
{
	/*
	 * Check if we are exiting from SOC_POWERDN.
	 */
	if (tegra_system_suspended()) {

		/*
		 * System resume complete.
		 */
		tegra_pm_system_suspend_exit();
	}

	return PSCI_E_SUCCESS;
}

int tegra_soc_prepare_cpu_off(unsigned long mpidr)
{
	/* Turn off wake_mask */
	mce_command_handler(MCE_CMD_UPDATE_CSTATE_INFO, 0, 0, 1);

	/* Turn off CPU */
	return mce_command_handler(MCE_CMD_ENTER_CSTATE, ~0, 0, 0);
}