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Tegra: pmc: helper function to find last ON CPU 

This patch adds a helper function to find the last standing CPU
in a cluster.

Change-Id: Id018f1958f458c772c7b0c52af8ddf7532b1cec5
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>
This commit is contained in:
Varun Wadekar 2018-02-13 20:22:19 -08:00
parent 1d11f73e58
commit a7a63e0ee5
2 changed files with 31 additions and 4 deletions
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27
plat/nvidia/tegra/common/drivers/pmc/pmc.c
View File

@ -17,7 +17,7 @@
/* Module IDs used during power ungate procedure */
static const uint32_t pmc_cpu_powergate_id[4] = {
0, /* CPU 0 */
14, /* CPU 0 */
9, /* CPU 1 */
10, /* CPU 2 */
11 /* CPU 3 */
@ -97,6 +97,31 @@ void tegra_pmc_lock_cpu_vectors(void)
tegra_pmc_write_32(PMC_SECURE_DISABLE3, val);
}
/*******************************************************************************
* Find out if this is the last standing CPU
******************************************************************************/
bool tegra_pmc_is_last_on_cpu(void)
{
int i, cpu = read_mpidr() & MPIDR_CPU_MASK;
uint32_t val = tegra_pmc_read_32(PMC_PWRGATE_STATUS);;
bool status = true;
/* check if this is the last standing CPU */
for (i = 0; i < PLATFORM_MAX_CPUS_PER_CLUSTER; i++) {
/* skip the current CPU */
if (i == cpu)
continue;
/* are other CPUs already power gated? */
if ((val & ((uint32_t)1 << pmc_cpu_powergate_id[i])) != 0U) {
status = false;
}
}
return status;
}
/*******************************************************************************
* Restart the system
******************************************************************************/

8
plat/nvidia/tegra/include/drivers/pmc.h
View File

@ -1,5 +1,5 @@
/*
* Copyright (c) 2015-2017, ARM Limited and Contributors. All rights reserved.
* Copyright (c) 2015-2018, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@ -9,6 +9,7 @@
#include <lib/mmio.h>
#include <lib/utils_def.h>
#include <stdbool.h>
#include <tegra_def.h>
@ -36,9 +37,10 @@ static inline void tegra_pmc_write_32(uint32_t off, uint32_t val)
mmio_write_32(TEGRA_PMC_BASE + off, val);
}
void tegra_pmc_cpu_setup(uint64_t reset_addr);
void tegra_pmc_lock_cpu_vectors(void);
void tegra_pmc_cpu_on(int32_t cpu);
void tegra_pmc_cpu_setup(uint64_t reset_addr);
bool tegra_pmc_is_last_on_cpu(void);
void tegra_pmc_lock_cpu_vectors(void);
__dead2 void tegra_pmc_system_reset(void);
#endif /* PMC_H */