From 65b5732d241b8b39e07653794eefffd0d8028cbb Mon Sep 17 00:00:00 2001 From: Doug Anderson Date: Wed, 8 Oct 2014 00:33:47 -0700 Subject: [PATCH] clocksource: arch_timer: Allow the device tree to specify uninitialized timer registers Some 32-bit (ARMv7) systems are architected like this: * The firmware doesn't know and doesn't care about hypervisor mode and we don't want to add the complexity of hypervisor there. * The firmware isn't involved in SMP bringup or resume. * The ARCH timer come up with an uninitialized offset (CNTVOFF) between the virtual and physical counters. Each core gets a different random offset. * The device boots in "Secure SVC" mode. * Nothing has touched the reset value of CNTHCTL.PL1PCEN or CNTHCTL.PL1PCTEN (both default to 1 at reset) On systems like the above, it doesn't make sense to use the virtual counter. There's nobody managing the offset and each time a core goes down and comes back up it will get reinitialized to some other random value. This adds an optional property which can inform the kernel of this situation, and firmware is free to remove the property if it is going to initialize the CNTVOFF registers when each CPU comes out of reset. Currently, the best course of action in this case is to use the physical timer, which is why it is important that CNTHCTL hasn't been changed from its reset value and it's a reasonable assumption given that the firmware has never entered HYP mode. Note that it's been said that on ARMv8 systems the firmware and kernel really can't be architected as described above. That means using the physical timer like this really only makes sense for ARMv7 systems. Signed-off-by: Doug Anderson Signed-off-by: Sonny Rao Reviewed-by: Mark Rutland Acked-by: Daniel Lezcano Acked-by: Catalin Marinas Signed-off-by: Olof Johansson --- Documentation/devicetree/bindings/arm/arch_timer.txt | 8 ++++++++ drivers/clocksource/arm_arch_timer.c | 8 ++++++++ 2 files changed, 16 insertions(+) diff --git a/Documentation/devicetree/bindings/arm/arch_timer.txt b/Documentation/devicetree/bindings/arm/arch_timer.txt index 37b2cafa4e52..256b4d8bab7b 100644 --- a/Documentation/devicetree/bindings/arm/arch_timer.txt +++ b/Documentation/devicetree/bindings/arm/arch_timer.txt @@ -22,6 +22,14 @@ to deliver its interrupts via SPIs. - always-on : a boolean property. If present, the timer is powered through an always-on power domain, therefore it never loses context. +** Optional properties: + +- arm,cpu-registers-not-fw-configured : Firmware does not initialize + any of the generic timer CPU registers, which contain their + architecturally-defined reset values. Only supported for 32-bit + systems which follow the ARMv7 architected reset values. + + Example: timer { diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c index 55256e4fb641..6967cb026b9e 100644 --- a/drivers/clocksource/arm_arch_timer.c +++ b/drivers/clocksource/arm_arch_timer.c @@ -704,6 +704,14 @@ static void __init arch_timer_init(struct device_node *np) arch_timer_ppi[i] = irq_of_parse_and_map(np, i); arch_timer_detect_rate(NULL, np); + /* + * If we cannot rely on firmware initializing the timer registers then + * we should use the physical timers instead. + */ + if (IS_ENABLED(CONFIG_ARM) && + of_property_read_bool(np, "arm,cpu-registers-not-fw-configured")) + arch_timer_use_virtual = false; + /* * If HYP mode is available, we know that the physical timer * has been configured to be accessible from PL1. Use it, so -- 2.20.1