blob: 1eff0aad09aa3d4502dda68da9ff4ba52f14e421 [file] [log] [blame]
/*
* 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 <arch_helpers.h>
#include <assert.h>
#include <bl_common.h>
#include <context_mgmt.h>
#include <debug.h>
#include <psci.h>
#include <tlk.h>
#include "tlkd_private.h"
extern tlk_context_t tlk_ctx;
#define MPIDR_CPU0 0x80000000
/*******************************************************************************
* Return the type of payload TLKD is dealing with. Report the current
* resident cpu (mpidr format) if it is a UP/UP migratable payload.
******************************************************************************/
static int32_t cpu_migrate_info(uint64_t *resident_cpu)
{
/* the payload runs only on CPU0 */
*resident_cpu = MPIDR_CPU0;
/* Uniprocessor, not migrate capable payload */
return PSCI_TOS_NOT_UP_MIG_CAP;
}
/*******************************************************************************
* This cpu is being suspended. Inform TLK of the SYSTEM_SUSPEND event, so
* that it can pass this information to its Trusted Apps.
******************************************************************************/
static void cpu_suspend_handler(uint64_t suspend_level)
{
gp_regs_t *gp_regs;
int cpu = read_mpidr() & MPIDR_CPU_MASK;
int32_t rc = 0;
/*
* TLK runs only on CPU0 and suspends its Trusted Apps during
* SYSTEM_SUSPEND. It has no role to play during CPU_SUSPEND.
*/
if ((cpu != 0) || (suspend_level != PLAT_MAX_PWR_LVL))
return;
/* pass system suspend event to TLK */
gp_regs = get_gpregs_ctx(&tlk_ctx.cpu_ctx);
write_ctx_reg(gp_regs, CTX_GPREG_X0, TLK_SYSTEM_SUSPEND);
/* Program the entry point and enter TLK */
rc = tlkd_synchronous_sp_entry(&tlk_ctx);
/*
* Read the response from TLK. A non-zero return means that
* something went wrong while communicating with it.
*/
if (rc != 0)
panic();
}
/*******************************************************************************
* This cpu is being resumed. Inform TLK of the SYSTEM_SUSPEND exit, so
* that it can pass this information to its Trusted Apps.
******************************************************************************/
static void cpu_resume_handler(uint64_t suspend_level)
{
gp_regs_t *gp_regs;
int cpu = read_mpidr() & MPIDR_CPU_MASK;
int32_t rc = 0;
/*
* TLK runs only on CPU0 and resumes its Trusted Apps during
* SYSTEM_SUSPEND exit. It has no role to play during CPU_SUSPEND
* exit.
*/
if ((cpu != 0) || (suspend_level != PLAT_MAX_PWR_LVL))
return;
/* pass system resume event to TLK */
gp_regs = get_gpregs_ctx(&tlk_ctx.cpu_ctx);
write_ctx_reg(gp_regs, CTX_GPREG_X0, TLK_SYSTEM_RESUME);
/* Program the entry point and enter TLK */
rc = tlkd_synchronous_sp_entry(&tlk_ctx);
/*
* Read the response from TLK. A non-zero return means that
* something went wrong while communicating with it.
*/
if (rc != 0)
panic();
}
/*******************************************************************************
* System is about to be reset. Inform the SP to allow any book-keeping
******************************************************************************/
static void system_off_handler(void)
{
int cpu = read_mpidr() & MPIDR_CPU_MASK;
gp_regs_t *gp_regs;
/* TLK runs only on CPU0 */
if (cpu != 0)
return;
/* pass system off/reset events to TLK */
gp_regs = get_gpregs_ctx(&tlk_ctx.cpu_ctx);
write_ctx_reg(gp_regs, CTX_GPREG_X0, TLK_SYSTEM_OFF);
/*
* Enter the SP. We do not care about the return value because we
* must continue with the shutdown anyway.
*/
(void)tlkd_synchronous_sp_entry(&tlk_ctx);
}
/*******************************************************************************
* Structure populated by the Dispatcher to be given a chance to perform any
* bookkeeping before PSCI executes a power mgmt. operation.
******************************************************************************/
const spd_pm_ops_t tlkd_pm_ops = {
.svc_migrate_info = cpu_migrate_info,
.svc_suspend = cpu_suspend_handler,
.svc_suspend_finish = cpu_resume_handler,
.svc_system_off = system_off_handler,
.svc_system_reset = system_off_handler
};