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/*
* Copyright (c) 2013-2014, 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 <arch_helpers.h>
#include <arm_gic.h>
#include <assert.h>
#include <bakery_lock.h>
#include <cci400.h>
#include <debug.h>
#include <mmio.h>
#include <platform.h>
#include <plat_config.h>
#include <platform_def.h>
#include <psci.h>
#include <errno.h>
#include "drivers/pwrc/fvp_pwrc.h"
#include "fvp_def.h"
#include "fvp_private.h"
/*******************************************************************************
* Private FVP function to program the mailbox for a cpu before it is released
* from reset.
******************************************************************************/
static void fvp_program_mailbox(uint64_t mpidr, uint64_t address)
{
uint64_t linear_id;
mailbox_t *fvp_mboxes;
linear_id = platform_get_core_pos(mpidr);
fvp_mboxes = (mailbox_t *)MBOX_BASE;
fvp_mboxes[linear_id].value = address;
flush_dcache_range((unsigned long) &fvp_mboxes[linear_id],
sizeof(unsigned long));
}
/*******************************************************************************
* Function which implements the common FVP specific operations to power down a
* cpu in response to a CPU_OFF or CPU_SUSPEND request.
******************************************************************************/
static void fvp_cpu_pwrdwn_common()
{
/* Prevent interrupts from spuriously waking up this cpu */
arm_gic_cpuif_deactivate();
/* Program the power controller to power off this cpu. */
fvp_pwrc_write_ppoffr(read_mpidr_el1());
}
/*******************************************************************************
* Function which implements the common FVP specific operations to power down a
* cluster in response to a CPU_OFF or CPU_SUSPEND request.
******************************************************************************/
static void fvp_cluster_pwrdwn_common()
{
uint64_t mpidr = read_mpidr_el1();
/* Disable coherency if this cluster is to be turned off */
if (get_plat_config()->flags & CONFIG_HAS_CCI)
cci_disable_cluster_coherency(mpidr);
/* Program the power controller to turn the cluster off */
fvp_pwrc_write_pcoffr(mpidr);
}
/*******************************************************************************
* Private FVP function which is used to determine if any platform actions
* should be performed for the specified affinity instance given its
* state. Nothing needs to be done if the 'state' is not off or if this is not
* the highest affinity level which will enter the 'state'.
******************************************************************************/
static int32_t fvp_do_plat_actions(unsigned int afflvl, unsigned int state)
{
unsigned int max_phys_off_afflvl;
assert(afflvl <= MPIDR_AFFLVL1);
if (state != PSCI_STATE_OFF)
return -EAGAIN;
/*
* Find the highest affinity level which will be suspended and postpone
* all the platform specific actions until that level is hit.
*/
max_phys_off_afflvl = psci_get_max_phys_off_afflvl();
assert(max_phys_off_afflvl != PSCI_INVALID_DATA);
if (afflvl != max_phys_off_afflvl)
return -EAGAIN;
return 0;
}
/*******************************************************************************
* FVP handler called when an affinity instance is about to enter standby.
******************************************************************************/
int fvp_affinst_standby(unsigned int power_state)
{
unsigned int target_afflvl;
/* Sanity check the requested state */
target_afflvl = psci_get_pstate_afflvl(power_state);
/*
* It's possible to enter standby only on affinity level 0 i.e. a cpu
* on the FVP. Ignore any other affinity level.
*/
if (target_afflvl != MPIDR_AFFLVL0)
return PSCI_E_INVALID_PARAMS;
/*
* Enter standby state
* dsb is good practice before using wfi to enter low power states
*/
dsb();
wfi();
return PSCI_E_SUCCESS;
}
/*******************************************************************************
* FVP handler called when an affinity instance is about to be turned on. The
* level and mpidr determine the affinity instance.
******************************************************************************/
int fvp_affinst_on(unsigned long mpidr,
unsigned long sec_entrypoint,
unsigned long ns_entrypoint,
unsigned int afflvl,
unsigned int state)
{
int rc = PSCI_E_SUCCESS;
unsigned int psysr;
/*
* It's possible to turn on only affinity level 0 i.e. a cpu
* on the FVP. Ignore any other affinity level.
*/
if (afflvl != MPIDR_AFFLVL0)
return rc;
/*
* Ensure that we do not cancel an inflight power off request
* for the target cpu. That would leave it in a zombie wfi.
* Wait for it to power off, program the jump address for the
* target cpu and then program the power controller to turn
* that cpu on
*/
do {
psysr = fvp_pwrc_read_psysr(mpidr);
} while (psysr & PSYSR_AFF_L0);
fvp_program_mailbox(mpidr, sec_entrypoint);
fvp_pwrc_write_pponr(mpidr);
return rc;
}
/*******************************************************************************
* FVP handler called when an affinity instance is about to be turned off. The
* level and mpidr determine the affinity instance. The 'state' arg. allows the
* platform to decide whether the cluster is being turned off and take apt
* actions.
*
* CAUTION: There is no guarantee that caches will remain turned on across calls
* to this function as each affinity level is dealt with. So do not write & read
* global variables across calls. It will be wise to do flush a write to the
* global to prevent unpredictable results.
******************************************************************************/
int fvp_affinst_off(unsigned long mpidr,
unsigned int afflvl,
unsigned int state)
{
/* Determine if any platform actions need to be executed */
if (fvp_do_plat_actions(afflvl, state) == -EAGAIN)
return PSCI_E_SUCCESS;
/*
* If execution reaches this stage then this affinity level will be
* suspended. Perform at least the cpu specific actions followed the
* cluster specific operations if applicable.
*/
fvp_cpu_pwrdwn_common();
if (afflvl != MPIDR_AFFLVL0)
fvp_cluster_pwrdwn_common();
return PSCI_E_SUCCESS;
}
/*******************************************************************************
* FVP handler called when an affinity instance is about to be suspended. The
* level and mpidr determine the affinity instance. The 'state' arg. allows the
* platform to decide whether the cluster is being turned off and take apt
* actions.
*
* CAUTION: There is no guarantee that caches will remain turned on across calls
* to this function as each affinity level is dealt with. So do not write & read
* global variables across calls. It will be wise to do flush a write to the
* global to prevent unpredictable results.
******************************************************************************/
int fvp_affinst_suspend(unsigned long mpidr,
unsigned long sec_entrypoint,
unsigned long ns_entrypoint,
unsigned int afflvl,
unsigned int state)
{
/* Determine if any platform actions need to be executed. */
if (fvp_do_plat_actions(afflvl, state) == -EAGAIN)
return PSCI_E_SUCCESS;
/* Program the jump address for the target cpu */
fvp_program_mailbox(read_mpidr_el1(), sec_entrypoint);
/* Program the power controller to enable wakeup interrupts. */
fvp_pwrc_set_wen(mpidr);
/* Perform the common cpu specific operations */
fvp_cpu_pwrdwn_common();
/* Perform the common cluster specific operations */
if (afflvl != MPIDR_AFFLVL0)
fvp_cluster_pwrdwn_common();
return PSCI_E_SUCCESS;
}
/*******************************************************************************
* FVP handler called when an affinity instance has just been powered on after
* being turned off earlier. The level and mpidr determine the affinity
* instance. The 'state' arg. allows the platform to decide whether the cluster
* was turned off prior to wakeup and do what's necessary to setup it up
* correctly.
******************************************************************************/
int fvp_affinst_on_finish(unsigned long mpidr,
unsigned int afflvl,
unsigned int state)
{
int rc = PSCI_E_SUCCESS;
/* Determine if any platform actions need to be executed. */
if (fvp_do_plat_actions(afflvl, state) == -EAGAIN)
return PSCI_E_SUCCESS;
/* Perform the common cluster specific operations */
if (afflvl != MPIDR_AFFLVL0) {
/*
* This CPU might have woken up whilst the cluster was
* attempting to power down. In this case the FVP power
* controller will have a pending cluster power off request
* which needs to be cleared by writing to the PPONR register.
* This prevents the power controller from interpreting a
* subsequent entry of this cpu into a simple wfi as a power
* down request.
*/
fvp_pwrc_write_pponr(mpidr);
/* Enable coherency if this cluster was off */
fvp_cci_enable();
}
/*
* Clear PWKUPR.WEN bit to ensure interrupts do not interfere
* with a cpu power down unless the bit is set again
*/
fvp_pwrc_clr_wen(mpidr);
/* Zero the jump address in the mailbox for this cpu */
fvp_program_mailbox(read_mpidr_el1(), 0);
/* Enable the gic cpu interface */
arm_gic_cpuif_setup();
/* TODO: This setup is needed only after a cold boot */
arm_gic_pcpu_distif_setup();
return rc;
}
/*******************************************************************************
* FVP handler called when an affinity instance has just been powered on after
* having been suspended earlier. The level and mpidr determine the affinity
* instance.
* TODO: At the moment we reuse the on finisher and reinitialize the secure
* context. Need to implement a separate suspend finisher.
******************************************************************************/
int fvp_affinst_suspend_finish(unsigned long mpidr,
unsigned int afflvl,
unsigned int state)
{
return fvp_affinst_on_finish(mpidr, afflvl, state);
}
/*******************************************************************************
* FVP handlers to shutdown/reboot the system
******************************************************************************/
static void __dead2 fvp_system_off(void)
{
/* Write the System Configuration Control Register */
mmio_write_32(VE_SYSREGS_BASE + V2M_SYS_CFGCTRL,
CFGCTRL_START | CFGCTRL_RW | CFGCTRL_FUNC(FUNC_SHUTDOWN));
wfi();
ERROR("FVP System Off: operation not handled.\n");
panic();
}
static void __dead2 fvp_system_reset(void)
{
/* Write the System Configuration Control Register */
mmio_write_32(VE_SYSREGS_BASE + V2M_SYS_CFGCTRL,
CFGCTRL_START | CFGCTRL_RW | CFGCTRL_FUNC(FUNC_REBOOT));
wfi();
ERROR("FVP System Reset: operation not handled.\n");
panic();
}
/*******************************************************************************
* Export the platform handlers to enable psci to invoke them
******************************************************************************/
static const plat_pm_ops_t fvp_plat_pm_ops = {
.affinst_standby = fvp_affinst_standby,
.affinst_on = fvp_affinst_on,
.affinst_off = fvp_affinst_off,
.affinst_suspend = fvp_affinst_suspend,
.affinst_on_finish = fvp_affinst_on_finish,
.affinst_suspend_finish = fvp_affinst_suspend_finish,
.system_off = fvp_system_off,
.system_reset = fvp_system_reset
};
/*******************************************************************************
* Export the platform specific power ops & initialize the fvp power controller
******************************************************************************/
int platform_setup_pm(const plat_pm_ops_t **plat_ops)
{
*plat_ops = &fvp_plat_pm_ops;
return 0;
}