You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
107 lines
4.3 KiB
107 lines
4.3 KiB
/*
|
|
* Copyright (c) 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 <assert.h>
|
|
#include <platform.h>
|
|
#include <tsp.h>
|
|
|
|
/*******************************************************************************
|
|
* Data structure to keep track of per-cpu secure generic timer context across
|
|
* power management operations.
|
|
******************************************************************************/
|
|
typedef struct timer_context {
|
|
uint64_t cval;
|
|
uint32_t ctl;
|
|
} timer_context_t;
|
|
|
|
static timer_context_t pcpu_timer_context[PLATFORM_CORE_COUNT];
|
|
|
|
/*******************************************************************************
|
|
* This function initializes the generic timer to fire every 0.5 second
|
|
******************************************************************************/
|
|
void tsp_generic_timer_start()
|
|
{
|
|
uint64_t cval;
|
|
uint32_t ctl = 0;
|
|
|
|
/* The timer will fire every 0.5 second */
|
|
cval = read_cntpct_el0() + (read_cntfrq_el0() >> 1);
|
|
write_cntps_cval_el1(cval);
|
|
|
|
/* Enable the secure physical timer */
|
|
set_cntp_ctl_enable(ctl);
|
|
write_cntps_ctl_el1(ctl);
|
|
}
|
|
|
|
/*******************************************************************************
|
|
* This function deasserts the timer interrupt and sets it up again
|
|
******************************************************************************/
|
|
void tsp_generic_timer_handler()
|
|
{
|
|
/* Ensure that the timer did assert the interrupt */
|
|
assert(get_cntp_ctl_istatus(read_cntps_ctl_el1()));
|
|
|
|
/* Disable the timer and reprogram it */
|
|
write_cntps_ctl_el1(0);
|
|
tsp_generic_timer_start();
|
|
}
|
|
|
|
/*******************************************************************************
|
|
* This function deasserts the timer interrupt prior to cpu power down
|
|
******************************************************************************/
|
|
void tsp_generic_timer_stop()
|
|
{
|
|
/* Disable the timer */
|
|
write_cntps_ctl_el1(0);
|
|
}
|
|
|
|
/*******************************************************************************
|
|
* This function saves the timer context prior to cpu suspension
|
|
******************************************************************************/
|
|
void tsp_generic_timer_save()
|
|
{
|
|
uint32_t linear_id = platform_get_core_pos(read_mpidr());
|
|
|
|
pcpu_timer_context[linear_id].cval = read_cntps_cval_el1();
|
|
pcpu_timer_context[linear_id].ctl = read_cntps_ctl_el1();
|
|
flush_dcache_range((uint64_t) &pcpu_timer_context[linear_id],
|
|
sizeof(pcpu_timer_context[linear_id]));
|
|
}
|
|
|
|
/*******************************************************************************
|
|
* This function restores the timer context post cpu resummption
|
|
******************************************************************************/
|
|
void tsp_generic_timer_restore()
|
|
{
|
|
uint32_t linear_id = platform_get_core_pos(read_mpidr());
|
|
|
|
write_cntps_cval_el1(pcpu_timer_context[linear_id].cval);
|
|
write_cntps_ctl_el1(pcpu_timer_context[linear_id].ctl);
|
|
}
|
|
|