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ARM: mach-shmobile: Don't init CNTVOFF/counter if PSCI is available

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If PSCI is available then most likely we are running on PSCI-enabled
U-Boot which, we assume, has already taken care of resetting CNTVOFF
and updating counter module before switching to non-secure mode
and we don't need to.

As the psci_smp_available() helper always returns false if CONFIG_SMP
is disabled, it can't be used safely as an indicator of PSCI usage.
For that reason, we check for the mandatory PSCI operation to be
available.

Please note, an extra check to prevent secure_cntvoff_init() from
being called for secondary CPUs in headsmp-apmu.S is not needed,
as SMP code for APMU based system is not executed if PSCI is in use.

Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
This commit is contained in:
Oleksandr Tyshchenko 2019-05-29 19:05:00 +03:00 committed by Simon Horman
parent a188339ca5
commit 51a0daf64d
1 changed files with 17 additions and 0 deletions
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17
arch/arm/mach-shmobile/setup-rcar-gen2.c
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@ -17,6 +17,7 @@
#include <linux/of.h>
#include <linux/of_fdt.h>
#include <linux/of_platform.h>
#include <linux/psci.h>
#include <asm/mach/arch.h>
#include <asm/secure_cntvoff.h>
#include "common.h"
@ -60,9 +61,24 @@ static unsigned int __init get_extal_freq(void)
void __init rcar_gen2_timer_init(void)
{
bool need_update = true;
void __iomem *base;
u32 freq;
/*
* If PSCI is available then most likely we are running on PSCI-enabled
* U-Boot which, we assume, has already taken care of resetting CNTVOFF
* and updating counter module before switching to non-secure mode
* and we don't need to.
*/
#ifdef CONFIG_ARM_PSCI_FW
if (psci_ops.cpu_on)
need_update = false;
#endif
if (need_update == false)
goto skip_update;
secure_cntvoff_init();
if (of_machine_is_compatible("renesas,r8a7745") ||
@ -102,6 +118,7 @@ void __init rcar_gen2_timer_init(void)
iounmap(base);
skip_update:
of_clk_init(NULL);
timer_probe();
}