203 lines
5.9 KiB
C
203 lines
5.9 KiB
C
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/*
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* Copyright (c) 2013-2015, ARM Limited and Contributors. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of ARM nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* APU specific definition of processors in the subsystem as well as functions
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* for getting information about and changing state of the APU.
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*/
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#include <gicv2.h>
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#include <bl_common.h>
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#include <mmio.h>
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#include "pm_api_sys.h"
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#include "pm_client.h"
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#include "pm_ipi.h"
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#include "../zynqmp_def.h"
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#define OCM_BANK_0 0xFFFC0000
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#define OCM_BANK_1 (OCM_BANK_0 + 0x10000)
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#define OCM_BANK_2 (OCM_BANK_1 + 0x10000)
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#define OCM_BANK_3 (OCM_BANK_2 + 0x10000)
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#define UNDEFINED_CPUID (~0)
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/* Declaration of linker defined symbol */
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extern unsigned long __BL31_END__;
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extern const struct pm_ipi apu_ipi;
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/* Order in pm_procs_all array must match cpu ids */
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static const struct pm_proc const pm_procs_all[] = {
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{
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.node_id = NODE_APU_0,
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.pwrdn_mask = APU_0_PWRCTL_CPUPWRDWNREQ_MASK,
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.ipi = &apu_ipi,
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},
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{
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.node_id = NODE_APU_1,
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.pwrdn_mask = APU_1_PWRCTL_CPUPWRDWNREQ_MASK,
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.ipi = &apu_ipi,
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},
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{
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.node_id = NODE_APU_2,
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.pwrdn_mask = APU_2_PWRCTL_CPUPWRDWNREQ_MASK,
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.ipi = &apu_ipi,
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},
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{
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.node_id = NODE_APU_3,
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.pwrdn_mask = APU_3_PWRCTL_CPUPWRDWNREQ_MASK,
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.ipi = &apu_ipi,
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},
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};
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/**
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* set_ocm_retention() - Configure OCM memory banks for retention
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*
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* APU specific requirements for suspend action:
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* OCM has to enter retention state in order to preserve saved
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* context after suspend request. OCM banks are determined by
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* __BL31_END__ linker symbol.
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*
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* Return: Returns status, either success or error+reason
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*/
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enum pm_ret_status set_ocm_retention(void)
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{
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enum pm_ret_status ret;
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/* OCM_BANK_0 will always be occupied */
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ret = pm_set_requirement(NODE_OCM_BANK_0, PM_CAP_CONTEXT, 0,
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REQ_ACK_NO);
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/* Check for other OCM banks */
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if ((unsigned long)&__BL31_END__ >= OCM_BANK_1)
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ret = pm_set_requirement(NODE_OCM_BANK_1, PM_CAP_CONTEXT, 0,
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REQ_ACK_NO);
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if ((unsigned long)&__BL31_END__ >= OCM_BANK_2)
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ret = pm_set_requirement(NODE_OCM_BANK_2, PM_CAP_CONTEXT, 0,
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REQ_ACK_NO);
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if ((unsigned long)&__BL31_END__ >= OCM_BANK_3)
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ret = pm_set_requirement(NODE_OCM_BANK_3, PM_CAP_CONTEXT, 0,
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REQ_ACK_NO);
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return ret;
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}
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/**
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* pm_get_proc() - returns pointer to the proc structure
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* @cpuid: id of the cpu whose proc struct pointer should be returned
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*
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* Return: pointer to a proc structure if proc is found, otherwise NULL
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*/
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const struct pm_proc *pm_get_proc(unsigned int cpuid)
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{
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if (cpuid < ARRAY_SIZE(pm_procs_all))
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return &pm_procs_all[cpuid];
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return NULL;
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}
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/**
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* pm_get_proc_by_node() - returns pointer to the proc structure
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* @nid: node id of the processor
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*
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* Return: pointer to a proc structure if proc is found, otherwise NULL
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*/
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const struct pm_proc *pm_get_proc_by_node(enum pm_node_id nid)
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{
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for (size_t i = 0; i < ARRAY_SIZE(pm_procs_all); i++) {
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if (nid == pm_procs_all[i].node_id)
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return &pm_procs_all[i];
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}
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return NULL;
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}
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/**
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* pm_get_cpuid() - get the local cpu ID for a global node ID
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* @nid: node id of the processor
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*
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* Return: the cpu ID (starting from 0) for the subsystem
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*/
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static unsigned int pm_get_cpuid(enum pm_node_id nid)
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{
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for (size_t i = 0; i < ARRAY_SIZE(pm_procs_all); i++) {
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if (pm_procs_all[i].node_id == nid)
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return i;
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}
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return UNDEFINED_CPUID;
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}
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const struct pm_proc *primary_proc = &pm_procs_all[0];
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/**
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* pm_client_suspend() - Client-specific suspend actions
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*
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* This function should contain any PU-specific actions
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* required prior to sending suspend request to PMU
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*/
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void pm_client_suspend(const struct pm_proc *proc)
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{
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/* Set powerdown request */
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mmio_write_32(APU_PWRCTL, mmio_read_32(APU_PWRCTL) | proc->pwrdn_mask);
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}
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/**
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* pm_client_abort_suspend() - Client-specific abort-suspend actions
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*
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* This function should contain any PU-specific actions
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* required for aborting a prior suspend request
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*/
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void pm_client_abort_suspend(void)
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{
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/* Enable interrupts at processor level (for current cpu) */
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gicv2_cpuif_enable();
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/* Clear powerdown request */
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mmio_write_32(APU_PWRCTL,
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mmio_read_32(APU_PWRCTL) & ~primary_proc->pwrdn_mask);
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}
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/**
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* pm_client_wakeup() - Client-specific wakeup actions
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*
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* This function should contain any PU-specific actions
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* required for waking up another APU core
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*/
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void pm_client_wakeup(const struct pm_proc *proc)
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{
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unsigned int cpuid = pm_get_cpuid(proc->node_id);
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if (cpuid == UNDEFINED_CPUID)
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return;
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/* clear powerdown bit for affected cpu */
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uint32_t val = mmio_read_32(APU_PWRCTL);
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val &= ~(proc->pwrdn_mask);
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mmio_write_32(APU_PWRCTL, val);
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}
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