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ARM: smp_scu: add a helper for powering on a specific CPU

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To boot the secondary CPUs on the Amlogic Meson8/Meson8m2 (Cortex-A9)
and Meson8b (Cortex-A5) SoCs we have to enable SCU mode SCU_PM_NORMAL,
otherwise the secondary cores will not start.
This patch adds a scu_cpu_power_enable() function which can be used to
enable SCU_PM_NORMAL for a specific (logical) CPU. An internal helper
function is also created, to avoid code duplication with
scu_power_mode().

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Acked-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>
This commit is contained in:
Martin Blumenstingl
2017-09-17 18:45:19 +02:00
committed by Kevin Hilman
parent 9c52aaf756
commit 0606326eff
2 changed files with 31 additions and 10 deletions
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6
arch/arm/include/asm/smp_scu.h
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@@ -27,6 +27,7 @@ static inline unsigned long scu_a9_get_base(void)
#ifdef CONFIG_HAVE_ARM_SCU
unsigned int scu_get_core_count(void __iomem *);
int scu_power_mode(void __iomem *, unsigned int);
int scu_cpu_power_enable(void __iomem *, unsigned int);
#else
static inline unsigned int scu_get_core_count(void __iomem *scu_base)
{
@@ -36,6 +37,11 @@ static inline int scu_power_mode(void __iomem *scu_base, unsigned int mode)
{
return -EINVAL;
}
static inline int scu_cpu_power_enable(void __iomem *scu_base,
unsigned int mode)
{
return -EINVAL;
}
#endif
#if defined(CONFIG_SMP) && defined(CONFIG_HAVE_ARM_SCU)