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/*
* Copyright (c) 2013-2016, 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.
*/
/*
* APU specific definition of processors in the subsystem as well as functions
* for getting information about and changing state of the APU.
*/
#include <bakery_lock.h>
#include <gicv2.h>
#include <bl_common.h>
#include <mmio.h>
#include <utils.h>
#include "pm_api_sys.h"
#include "pm_client.h"
#include "pm_ipi.h"
#include "../zynqmp_def.h"
#define UNDEFINED_CPUID (~0)
DEFINE_BAKERY_LOCK(pm_client_secure_lock);
extern const struct pm_ipi apu_ipi;
/* Order in pm_procs_all array must match cpu ids */
static const struct pm_proc const pm_procs_all[] = {
{
.node_id = NODE_APU_0,
.pwrdn_mask = APU_0_PWRCTL_CPUPWRDWNREQ_MASK,
.ipi = &apu_ipi,
},
{
.node_id = NODE_APU_1,
.pwrdn_mask = APU_1_PWRCTL_CPUPWRDWNREQ_MASK,
.ipi = &apu_ipi,
},
{
.node_id = NODE_APU_2,
.pwrdn_mask = APU_2_PWRCTL_CPUPWRDWNREQ_MASK,
.ipi = &apu_ipi,
},
{
.node_id = NODE_APU_3,
.pwrdn_mask = APU_3_PWRCTL_CPUPWRDWNREQ_MASK,
.ipi = &apu_ipi,
},
};
/**
* pm_get_proc() - returns pointer to the proc structure
* @cpuid: id of the cpu whose proc struct pointer should be returned
*
* Return: pointer to a proc structure if proc is found, otherwise NULL
*/
const struct pm_proc *pm_get_proc(unsigned int cpuid)
{
if (cpuid < ARRAY_SIZE(pm_procs_all))
return &pm_procs_all[cpuid];
return NULL;
}
/**
* pm_get_proc_by_node() - returns pointer to the proc structure
* @nid: node id of the processor
*
* Return: pointer to a proc structure if proc is found, otherwise NULL
*/
const struct pm_proc *pm_get_proc_by_node(enum pm_node_id nid)
{
for (size_t i = 0; i < ARRAY_SIZE(pm_procs_all); i++) {
if (nid == pm_procs_all[i].node_id)
return &pm_procs_all[i];
}
return NULL;
}
/**
* pm_get_cpuid() - get the local cpu ID for a global node ID
* @nid: node id of the processor
*
* Return: the cpu ID (starting from 0) for the subsystem
*/
static unsigned int pm_get_cpuid(enum pm_node_id nid)
{
for (size_t i = 0; i < ARRAY_SIZE(pm_procs_all); i++) {
if (pm_procs_all[i].node_id == nid)
return i;
}
return UNDEFINED_CPUID;
}
const struct pm_proc *primary_proc = &pm_procs_all[0];
/**
* pm_client_suspend() - Client-specific suspend actions
*
* This function should contain any PU-specific actions
* required prior to sending suspend request to PMU
*/
void pm_client_suspend(const struct pm_proc *proc)
{
bakery_lock_get(&pm_client_secure_lock);
/* Set powerdown request */
mmio_write_32(APU_PWRCTL, mmio_read_32(APU_PWRCTL) | proc->pwrdn_mask);
bakery_lock_release(&pm_client_secure_lock);
}
/**
* pm_client_abort_suspend() - Client-specific abort-suspend actions
*
* This function should contain any PU-specific actions
* required for aborting a prior suspend request
*/
void pm_client_abort_suspend(void)
{
/* Enable interrupts at processor level (for current cpu) */
gicv2_cpuif_enable();
bakery_lock_get(&pm_client_secure_lock);
/* Clear powerdown request */
mmio_write_32(APU_PWRCTL,
mmio_read_32(APU_PWRCTL) & ~primary_proc->pwrdn_mask);
bakery_lock_release(&pm_client_secure_lock);
}
/**
* pm_client_wakeup() - Client-specific wakeup actions
*
* This function should contain any PU-specific actions
* required for waking up another APU core
*/
void pm_client_wakeup(const struct pm_proc *proc)
{
unsigned int cpuid = pm_get_cpuid(proc->node_id);
if (cpuid == UNDEFINED_CPUID)
return;
bakery_lock_get(&pm_client_secure_lock);
/* clear powerdown bit for affected cpu */
uint32_t val = mmio_read_32(APU_PWRCTL);
val &= ~(proc->pwrdn_mask);
mmio_write_32(APU_PWRCTL, val);
bakery_lock_release(&pm_client_secure_lock);
}
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