[U-Boot] [PATCH v6 13/15] tegra: Set CNTFRQ for secondary CPUs

Jan Kiszka
2015-04-13T04:48:18Z

We only set CNTFRQ in arch_timer_init for the boot CPU. But this has to
happen for all cores.

Fixing this resolves problems of KVM with emulating the generic
timer/counter.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Thierry Reding <treding@nvidia.com>
Tested-by: Thierry Reding <treding@nvidia.com>
Tested-by: Ian Campbell <ijc@hellion.org.uk>
---
arch/arm/mach-tegra/psci.S | 13 +++++++++++++
1 file changed, 13 insertions(+)

diff --git a/arch/arm/mach-tegra/psci.S b/arch/arm/mach-tegra/psci.S
index e4733e6..b836da1 100644
--- a/arch/arm/mach-tegra/psci.S
+++ b/arch/arm/mach-tegra/psci.S
@@ -51,12 +51,25 @@ ENTRY(psci_arch_init)
str r5, [r4]

bl psci_get_cpu_id @ CPU ID => r0
+
+ adr r5, _sys_clock_freq
+ cmp r0, #0
+
+ mrceq p15, 0, r7, c14, c0, 0 @ read CNTFRQ from CPU0
+ streq r7, [r5]
+
+ ldrne r7, [r5]
+ mcrne p15, 0, r7, c14, c0, 0 @ write CNTFRQ to CPU1..3
+
bl psci_get_cpu_stack_top @ stack top => r0
mov sp, r0

bx r6
ENDPROC(psci_arch_init)

+_sys_clock_freq:
+ .word 0
+
ENTRY(psci_cpu_off)
bl psci_cpu_off_common

--
2.1.4