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Enable secure timer to generate S-EL1 interrupts 

This patch enables secure physical timer during TSP initialisation and
maintains it across power management operations so that a timer
interrupt is generated every half second.

Fixes ARM-software/tf-issues#104
Fixes ARM-software/tf-issues#134

Change-Id: I66c6cfd24bd5e6035ba75ebf0f047e568770a369
This commit is contained in:
Achin Gupta 2014-05-09 13:33:42 +01:00
parent b44a4435c9
commit a20a81e5b4
1 changed files with 21 additions and 0 deletions
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21
bl32/tsp/tsp_main.c
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@ -128,6 +128,7 @@ uint64_t tsp_main(void)
bl32_platform_setup();
/* Initialize secure/applications state here */
tsp_generic_timer_start();
/* Update this cpu's statistics */
tsp_stats[linear_id].smc_count++;
@ -163,6 +164,9 @@ tsp_args_t *tsp_cpu_on_main(void)
uint64_t mpidr = read_mpidr();
uint32_t linear_id = platform_get_core_pos(mpidr);
/* Initialize secure/applications state here */
tsp_generic_timer_start();
/* Update this cpu's statistics */
tsp_stats[linear_id].smc_count++;
tsp_stats[linear_id].eret_count++;
@ -196,6 +200,13 @@ tsp_args_t *tsp_cpu_off_main(uint64_t arg0,
uint64_t mpidr = read_mpidr();
uint32_t linear_id = platform_get_core_pos(mpidr);
/*
* This cpu is being turned off, so disable the timer to prevent the
* secure timer interrupt from interfering with power down. A pending
* interrupt will be lost but we do not care as we are turning off.
*/
tsp_generic_timer_stop();
/* Update this cpu's statistics */
tsp_stats[linear_id].smc_count++;
tsp_stats[linear_id].eret_count++;
@ -231,6 +242,13 @@ tsp_args_t *tsp_cpu_suspend_main(uint64_t power_state,
uint64_t mpidr = read_mpidr();
uint32_t linear_id = platform_get_core_pos(mpidr);
/*
* Save the time context and disable it to prevent the secure timer
* interrupt from interfering with wakeup from the suspend state.
*/
tsp_generic_timer_save();
tsp_generic_timer_stop();
/* Update this cpu's statistics */
tsp_stats[linear_id].smc_count++;
tsp_stats[linear_id].eret_count++;
@ -266,6 +284,9 @@ tsp_args_t *tsp_cpu_resume_main(uint64_t suspend_level,
uint64_t mpidr = read_mpidr();
uint32_t linear_id = platform_get_core_pos(mpidr);
/* Restore the generic timer context */
tsp_generic_timer_restore();
/* Update this cpu's statistics */
tsp_stats[linear_id].smc_count++;
tsp_stats[linear_id].eret_count++;