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linux/drivers/clocksource/Kconfig
Serge Semin 7d7de1a653 clocksource: mips-gic-timer: Mark GIC timer as unstable if ref clock changes 
Currently clocksource framework doesn't support the clocks with variable
frequency. Since MIPS GIC timer ticks rate might be unstable on some
platforms, we must make sure that it justifies the clocksource
requirements. MIPS GIC timer is incremented with the CPU cluster reference
clocks rate. So in case if CPU frequency changes, the MIPS GIC tick rate
changes synchronously. Due to this the clocksource subsystem can't rely on
the timer to measure system clocks anymore. This commit marks the MIPS GIC
based clocksource as unstable if reference clock (normally it's a CPU
reference clocks) rate changes. The clocksource will execute a watchdog
thread, which lowers the MIPS GIC timer rating to zero and fallbacks to a
new stable one.

Note we don't need to set the CLOCK_SOURCE_MUST_VERIFY flag to the MIPS
GIC clocksource since normally the timer is stable. The only reason why
it gets unstable is due to the ref clock rate change, which event we
detect here in the driver by means of the clocks event notifier.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Cc: Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Paul Burton <paulburton@kernel.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: linux-mips@vger.kernel.org
Cc: linux-rtc@vger.kernel.org
Cc: devicetree@vger.kernel.org
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20200521204818.25436-9-Sergey.Semin@baikalelectronics.ru
2020-05-23 00:03:16 +02:00

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# SPDX-License-Identifier: GPL-2.0-only
menu "Clock Source drivers"
depends on GENERIC_CLOCKEVENTS
config TIMER_OF
bool
select TIMER_PROBE
config TIMER_ACPI
bool
select TIMER_PROBE
config TIMER_PROBE
bool
config CLKSRC_I8253
bool
config CLKEVT_I8253
bool
config I8253_LOCK
bool
config OMAP_DM_TIMER
bool
config CLKBLD_I8253
def_bool y if CLKSRC_I8253 || CLKEVT_I8253 || I8253_LOCK
config CLKSRC_MMIO
bool
config BCM2835_TIMER
bool "BCM2835 timer driver" if COMPILE_TEST
select CLKSRC_MMIO
help
Enables the support for the BCM2835 timer driver.
config BCM_KONA_TIMER
bool "BCM mobile timer driver" if COMPILE_TEST
select CLKSRC_MMIO
help
Enables the support for the BCM Kona mobile timer driver.
config DAVINCI_TIMER
bool "Texas Instruments DaVinci timer driver" if COMPILE_TEST
help
Enables the support for the TI DaVinci timer driver.
config DIGICOLOR_TIMER
bool "Digicolor timer driver" if COMPILE_TEST
select CLKSRC_MMIO
depends on HAS_IOMEM
help
Enables the support for the digicolor timer driver.
config DW_APB_TIMER
bool "DW APB timer driver" if COMPILE_TEST
help
Enables the support for the dw_apb timer.
config DW_APB_TIMER_OF
bool
select DW_APB_TIMER
select TIMER_OF
config FTTMR010_TIMER
bool "Faraday Technology timer driver" if COMPILE_TEST
depends on HAS_IOMEM
select CLKSRC_MMIO
select TIMER_OF
select MFD_SYSCON
help
Enables support for the Faraday Technology timer block
FTTMR010.
config IXP4XX_TIMER
bool "Intel XScale IXP4xx timer driver" if COMPILE_TEST
depends on HAS_IOMEM
select CLKSRC_MMIO
help
Enables support for the Intel XScale IXP4xx SoC timer.
config ROCKCHIP_TIMER
bool "Rockchip timer driver" if COMPILE_TEST
depends on ARM || ARM64
select TIMER_OF
select CLKSRC_MMIO
help
Enables the support for the Rockchip timer driver.
config ARMADA_370_XP_TIMER
bool "Armada 370 and XP timer driver" if COMPILE_TEST
depends on ARM
select TIMER_OF
select CLKSRC_MMIO
help
Enables the support for the Armada 370 and XP timer driver.
config MESON6_TIMER
bool "Meson6 timer driver" if COMPILE_TEST
select CLKSRC_MMIO
help
Enables the support for the Meson6 timer driver.
config ORION_TIMER
bool "Orion timer driver" if COMPILE_TEST
depends on ARM
select TIMER_OF
select CLKSRC_MMIO
help
Enables the support for the Orion timer driver
config OWL_TIMER
bool "Owl timer driver" if COMPILE_TEST
select CLKSRC_MMIO
help
Enables the support for the Actions Semi Owl timer driver.
config RDA_TIMER
bool "RDA timer driver" if COMPILE_TEST
select CLKSRC_MMIO
select TIMER_OF
help
Enables the support for the RDA Micro timer driver.
config SUN4I_TIMER
bool "Sun4i timer driver" if COMPILE_TEST
depends on HAS_IOMEM
select CLKSRC_MMIO
select TIMER_OF
help
Enables support for the Sun4i timer.
config SUN5I_HSTIMER
bool "Sun5i timer driver" if COMPILE_TEST
select CLKSRC_MMIO
depends on COMMON_CLK
help
Enables support the Sun5i timer.
config TEGRA_TIMER
bool "Tegra timer driver" if COMPILE_TEST
select CLKSRC_MMIO
select TIMER_OF
depends on ARCH_TEGRA || COMPILE_TEST
help
Enables support for the Tegra driver.
config VT8500_TIMER
bool "VT8500 timer driver" if COMPILE_TEST
depends on HAS_IOMEM
help
Enables support for the VT8500 driver.
config NPCM7XX_TIMER
bool "NPCM7xx timer driver" if COMPILE_TEST
depends on HAS_IOMEM
select TIMER_OF
select CLKSRC_MMIO
help
Enable 24-bit TIMER0 and TIMER1 counters in the NPCM7xx architecture,
where TIMER0 serves as clockevent and TIMER1 serves as clocksource.
config CADENCE_TTC_TIMER
bool "Cadence TTC timer driver" if COMPILE_TEST
depends on COMMON_CLK
help
Enables support for the Cadence TTC driver.
config ASM9260_TIMER
bool "ASM9260 timer driver" if COMPILE_TEST
select CLKSRC_MMIO
select TIMER_OF
help
Enables support for the ASM9260 timer.
config CLKSRC_NOMADIK_MTU
bool "Nomakdik clocksource driver" if COMPILE_TEST
depends on ARM
select CLKSRC_MMIO
help
Support for Multi Timer Unit. MTU provides access
to multiple interrupt generating programmable
32-bit free running decrementing counters.
config CLKSRC_DBX500_PRCMU
bool "Clocksource PRCMU Timer" if COMPILE_TEST
depends on HAS_IOMEM
help
Use the always on PRCMU Timer as clocksource.
config CLPS711X_TIMER
bool "Cirrus Logic timer driver" if COMPILE_TEST
select CLKSRC_MMIO
help
Enables support for the Cirrus Logic PS711 timer.
config ATLAS7_TIMER
bool "Atlas7 timer driver" if COMPILE_TEST
select CLKSRC_MMIO
help
Enables support for the Atlas7 timer.
config MXS_TIMER
bool "MXS timer driver" if COMPILE_TEST
select CLKSRC_MMIO
select STMP_DEVICE
help
Enables support for the MXS timer.
config PRIMA2_TIMER
bool "Prima2 timer driver" if COMPILE_TEST
select CLKSRC_MMIO
help
Enables support for the Prima2 timer.
config U300_TIMER
bool "U300 timer driver" if COMPILE_TEST
depends on ARM
select CLKSRC_MMIO
help
Enables support for the U300 timer.
config NSPIRE_TIMER
bool "NSpire timer driver" if COMPILE_TEST
select CLKSRC_MMIO
help
Enables support for the Nspire timer.
config KEYSTONE_TIMER
bool "Keystone timer driver" if COMPILE_TEST
depends on ARM || ARM64
select CLKSRC_MMIO
help
Enables support for the Keystone timer.
config INTEGRATOR_AP_TIMER
bool "Integrator-AP timer driver" if COMPILE_TEST
select CLKSRC_MMIO
help
Enables support for the Integrator-AP timer.
config CLKSRC_EFM32
bool "Clocksource for Energy Micro's EFM32 SoCs" if !ARCH_EFM32
depends on OF && ARM && (ARCH_EFM32 || COMPILE_TEST)
select CLKSRC_MMIO
default ARCH_EFM32
help
Support to use the timers of EFM32 SoCs as clock source and clock
event device.
config CLKSRC_LPC32XX
bool "Clocksource for LPC32XX" if COMPILE_TEST
depends on HAS_IOMEM
depends on ARM
select CLKSRC_MMIO
select TIMER_OF
help
Support for the LPC32XX clocksource.
config CLKSRC_PISTACHIO
bool "Clocksource for Pistachio SoC" if COMPILE_TEST
depends on HAS_IOMEM
select TIMER_OF
help
Enables the clocksource for the Pistachio SoC.
config CLKSRC_TI_32K
bool "Texas Instruments 32.768 Hz Clocksource" if COMPILE_TEST
depends on GENERIC_SCHED_CLOCK
select TIMER_OF if OF
help
This option enables support for Texas Instruments 32.768 Hz clocksource
available on many OMAP-like platforms.
config CLKSRC_NPS
bool "NPS400 clocksource driver" if COMPILE_TEST
depends on !PHYS_ADDR_T_64BIT
select CLKSRC_MMIO
select TIMER_OF if OF
help
NPS400 clocksource support.
It has a 64-bit counter with update rate up to 1000MHz.
This counter is accessed via couple of 32-bit memory-mapped registers.
config CLKSRC_STM32
bool "Clocksource for STM32 SoCs" if !ARCH_STM32
depends on OF && ARM && (ARCH_STM32 || COMPILE_TEST)
select CLKSRC_MMIO
select TIMER_OF
config CLKSRC_MPS2
bool "Clocksource for MPS2 SoCs" if COMPILE_TEST
depends on GENERIC_SCHED_CLOCK
select CLKSRC_MMIO
select TIMER_OF
config ARC_TIMERS
bool "Support for 32-bit TIMERn counters in ARC Cores" if COMPILE_TEST
depends on GENERIC_SCHED_CLOCK
select TIMER_OF
help
These are legacy 32-bit TIMER0 and TIMER1 counters found on all ARC cores
(ARC700 as well as ARC HS38).
TIMER0 serves as clockevent while TIMER1 provides clocksource.
config ARC_TIMERS_64BIT
bool "Support for 64-bit counters in ARC HS38 cores" if COMPILE_TEST
depends on ARC_TIMERS
select TIMER_OF
help
This enables 2 different 64-bit timers: RTC (for UP) and GFRC (for SMP).
RTC is implemented inside the core, while GFRC sits outside the core in
ARConnect IP block. Driver automatically picks one of them for clocksource
as appropriate.
config ARM_ARCH_TIMER
bool
select TIMER_OF if OF
select TIMER_ACPI if ACPI
config ARM_ARCH_TIMER_EVTSTREAM
bool "Enable ARM architected timer event stream generation by default"
default y if ARM_ARCH_TIMER
depends on ARM_ARCH_TIMER
help
This option enables support by default for event stream generation
based on the ARM architected timer. It is used for waking up CPUs
executing the wfe instruction at a frequency represented as a
power-of-2 divisor of the clock rate. The behaviour can also be
overridden on the command line using the
clocksource.arm_arch_timer.evtstream parameter.
The main use of the event stream is wfe-based timeouts of userspace
locking implementations. It might also be useful for imposing timeout
on wfe to safeguard against any programming errors in case an expected
event is not generated.
This must be disabled for hardware validation purposes to detect any
hardware anomalies of missing events.
config ARM_ARCH_TIMER_OOL_WORKAROUND
bool
config FSL_ERRATUM_A008585
bool "Workaround for Freescale/NXP Erratum A-008585"
default y
depends on ARM_ARCH_TIMER && ARM64
select ARM_ARCH_TIMER_OOL_WORKAROUND
help
This option enables a workaround for Freescale/NXP Erratum
A-008585 ("ARM generic timer may contain an erroneous
value"). The workaround will only be active if the
fsl,erratum-a008585 property is found in the timer node.
config HISILICON_ERRATUM_161010101
bool "Workaround for Hisilicon Erratum 161010101"
default y
select ARM_ARCH_TIMER_OOL_WORKAROUND
depends on ARM_ARCH_TIMER && ARM64
help
This option enables a workaround for Hisilicon Erratum
161010101. The workaround will be active if the hisilicon,erratum-161010101
property is found in the timer node.
config ARM64_ERRATUM_858921
bool "Workaround for Cortex-A73 erratum 858921"
default y
select ARM_ARCH_TIMER_OOL_WORKAROUND
depends on ARM_ARCH_TIMER && ARM64
help
This option enables a workaround applicable to Cortex-A73
(all versions), whose counter may return incorrect values.
The workaround will be dynamically enabled when an affected
core is detected.
config SUN50I_ERRATUM_UNKNOWN1
bool "Workaround for Allwinner A64 erratum UNKNOWN1"
default y
depends on ARM_ARCH_TIMER && ARM64 && ARCH_SUNXI
select ARM_ARCH_TIMER_OOL_WORKAROUND
help
This option enables a workaround for instability in the timer on
the Allwinner A64 SoC. The workaround will only be active if the
allwinner,erratum-unknown1 property is found in the timer node.
config ARM_GLOBAL_TIMER
bool "Support for the ARM global timer" if COMPILE_TEST
select TIMER_OF if OF
depends on ARM
help
This option enables support for the ARM global timer unit.
config ARM_TIMER_SP804
bool "Support for Dual Timer SP804 module" if COMPILE_TEST
depends on GENERIC_SCHED_CLOCK && CLKDEV_LOOKUP
select CLKSRC_MMIO
select TIMER_OF if OF
config CLKSRC_ARM_GLOBAL_TIMER_SCHED_CLOCK
bool
depends on ARM_GLOBAL_TIMER
default y
help
Use ARM global timer clock source as sched_clock.
config ARMV7M_SYSTICK
bool "Support for the ARMv7M system time" if COMPILE_TEST
select TIMER_OF if OF
select CLKSRC_MMIO
help
This option enables support for the ARMv7M system timer unit.
config ATMEL_PIT
bool "Atmel PIT support" if COMPILE_TEST
depends on HAS_IOMEM
select TIMER_OF if OF
help
Support for the Periodic Interval Timer found on Atmel SoCs.
config ATMEL_ST
bool "Atmel ST timer support" if COMPILE_TEST
depends on HAS_IOMEM
select TIMER_OF
select MFD_SYSCON
help
Support for the Atmel ST timer.
config ATMEL_TCB_CLKSRC
bool "Atmel TC Block timer driver" if COMPILE_TEST
depends on ARM && HAS_IOMEM
select TIMER_OF if OF
help
Support for Timer Counter Blocks on Atmel SoCs.
config CLKSRC_EXYNOS_MCT
bool "Exynos multi core timer driver" if COMPILE_TEST
depends on ARM || ARM64
help
Support for Multi Core Timer controller on Exynos SoCs.
config CLKSRC_SAMSUNG_PWM
bool "PWM timer driver for Samsung S3C, S5P" if COMPILE_TEST
depends on HAS_IOMEM
help
This is a new clocksource driver for the PWM timer found in
Samsung S3C, S5P and Exynos SoCs, replacing an earlier driver
for all devicetree enabled platforms. This driver will be
needed only on systems that do not have the Exynos MCT available.
config FSL_FTM_TIMER
bool "Freescale FlexTimer Module driver" if COMPILE_TEST
depends on HAS_IOMEM
select CLKSRC_MMIO
help
Support for Freescale FlexTimer Module (FTM) timer.
config VF_PIT_TIMER
bool
select CLKSRC_MMIO
help
Support for Periodic Interrupt Timer on Freescale Vybrid Family SoCs.
config OXNAS_RPS_TIMER
bool "Oxford Semiconductor OXNAS RPS Timers driver" if COMPILE_TEST
select TIMER_OF
select CLKSRC_MMIO
help
This enables support for the Oxford Semiconductor OXNAS RPS timers.
config SYS_SUPPORTS_SH_CMT
bool
config MTK_TIMER
bool "Mediatek timer driver" if COMPILE_TEST
depends on HAS_IOMEM
select TIMER_OF
select CLKSRC_MMIO
help
Support for Mediatek timer driver.
config SPRD_TIMER
bool "Spreadtrum timer driver" if EXPERT
depends on HAS_IOMEM
depends on (ARCH_SPRD || COMPILE_TEST)
default ARCH_SPRD
select TIMER_OF
help
Enables support for the Spreadtrum timer driver.
config SYS_SUPPORTS_SH_MTU2
bool
config SYS_SUPPORTS_SH_TMU
bool
config SYS_SUPPORTS_EM_STI
bool
config CLKSRC_JCORE_PIT
bool "J-Core PIT timer driver" if COMPILE_TEST
depends on OF
depends on HAS_IOMEM
select CLKSRC_MMIO
help
This enables build of clocksource and clockevent driver for
the integrated PIT in the J-Core synthesizable, open source SoC.
config SH_TIMER_CMT
bool "Renesas CMT timer driver" if COMPILE_TEST
depends on HAS_IOMEM
default SYS_SUPPORTS_SH_CMT
help
This enables build of a clocksource and clockevent driver for
the Compare Match Timer (CMT) hardware available in 16/32/48-bit
variants on a wide range of Mobile and Automotive SoCs from Renesas.
config SH_TIMER_MTU2
bool "Renesas MTU2 timer driver" if COMPILE_TEST
depends on HAS_IOMEM
default SYS_SUPPORTS_SH_MTU2
help
This enables build of a clockevent driver for the Multi-Function
Timer Pulse Unit 2 (MTU2) hardware available on SoCs from Renesas.
This hardware comes with 16-bit timer registers.
config RENESAS_OSTM
bool "Renesas OSTM timer driver" if COMPILE_TEST
select CLKSRC_MMIO
select TIMER_OF
help
Enables the support for the Renesas OSTM.
config SH_TIMER_TMU
bool "Renesas TMU timer driver" if COMPILE_TEST
depends on HAS_IOMEM
default SYS_SUPPORTS_SH_TMU
help
This enables build of a clocksource and clockevent driver for
the 32-bit Timer Unit (TMU) hardware available on a wide range
SoCs from Renesas.
config EM_TIMER_STI
bool "Renesas STI timer driver" if COMPILE_TEST
depends on HAS_IOMEM
default SYS_SUPPORTS_EM_STI
help
This enables build of a clocksource and clockevent driver for
the 48-bit System Timer (STI) hardware available on a SoCs
such as EMEV2 from former NEC Electronics.
config CLKSRC_QCOM
bool "Qualcomm MSM timer" if COMPILE_TEST
depends on ARM
select TIMER_OF
help
This enables the clocksource and the per CPU clockevent driver for the
Qualcomm SoCs.
config CLKSRC_VERSATILE
bool "ARM Versatile (Express) reference platforms clock source" if COMPILE_TEST
depends on GENERIC_SCHED_CLOCK && !ARCH_USES_GETTIMEOFFSET
select TIMER_OF
default y if (ARCH_VEXPRESS || ARCH_VERSATILE) && ARM
help
This option enables clock source based on free running
counter available in the "System Registers" block of
ARM Versatile and Versatile Express reference platforms.
config CLKSRC_MIPS_GIC
bool
depends on MIPS_GIC
select CLOCKSOURCE_WATCHDOG
select TIMER_OF
config CLKSRC_TANGO_XTAL
bool "Clocksource for Tango SoC" if COMPILE_TEST
depends on ARM
select TIMER_OF
select CLKSRC_MMIO
help
This enables the clocksource for Tango SoC.
config CLKSRC_PXA
bool "Clocksource for PXA or SA-11x0 platform" if COMPILE_TEST
depends on HAS_IOMEM
select CLKSRC_MMIO
help
This enables OST0 support available on PXA and SA-11x0
platforms.
config H8300_TMR8
bool "Clockevent timer for the H8300 platform" if COMPILE_TEST
depends on HAS_IOMEM
help
This enables the 8 bits timer for the H8300 platform.
config H8300_TMR16
bool "Clockevent timer for the H83069 platform" if COMPILE_TEST
depends on HAS_IOMEM
help
This enables the 16 bits timer for the H8300 platform with the
H83069 CPU.
config H8300_TPU
bool "Clocksource for the H8300 platform" if COMPILE_TEST
depends on HAS_IOMEM
help
This enables the clocksource for the H8300 platform with the
H8S2678 CPU.
config CLKSRC_IMX_GPT
bool "Clocksource using i.MX GPT" if COMPILE_TEST
depends on (ARM || ARM64) && CLKDEV_LOOKUP
select CLKSRC_MMIO
config CLKSRC_IMX_TPM
bool "Clocksource using i.MX TPM" if COMPILE_TEST
depends on ARM && CLKDEV_LOOKUP
select CLKSRC_MMIO
help
Enable this option to use IMX Timer/PWM Module (TPM) timer as
clocksource.
config TIMER_IMX_SYS_CTR
bool "i.MX system counter timer" if COMPILE_TEST
select TIMER_OF
help
Enable this option to use i.MX system counter timer as a
clockevent.
config CLKSRC_ST_LPC
bool "Low power clocksource found in the LPC" if COMPILE_TEST
select TIMER_OF if OF
depends on HAS_IOMEM
select CLKSRC_MMIO
help
Enable this option to use the Low Power controller timer
as clocksource.
config ATCPIT100_TIMER
bool "ATCPIT100 timer driver"
depends on NDS32 || COMPILE_TEST
depends on HAS_IOMEM
select TIMER_OF
default NDS32
help
This option enables support for the Andestech ATCPIT100 timers.
config RISCV_TIMER
bool "Timer for the RISC-V platform"
depends on GENERIC_SCHED_CLOCK && RISCV
default y
select TIMER_PROBE
select TIMER_OF
help
This enables the per-hart timer built into all RISC-V systems, which
is accessed via both the SBI and the rdcycle instruction. This is
required for all RISC-V systems.
config CSKY_MP_TIMER
bool "SMP Timer for the C-SKY platform" if COMPILE_TEST
depends on CSKY
select TIMER_OF
help
Say yes here to enable C-SKY SMP timer driver used for C-SKY SMP
system.
csky,mptimer is not only used in SMP system, it also could be used in
single core system. It's not a mmio reg and it uses mtcr/mfcr instruction.
config GX6605S_TIMER
bool "Gx6605s SOC system timer driver" if COMPILE_TEST
depends on CSKY
select CLKSRC_MMIO
select TIMER_OF
help
This option enables support for gx6605s SOC's timer.
config MILBEAUT_TIMER
bool "Milbeaut timer driver" if COMPILE_TEST
depends on OF
depends on ARM
select TIMER_OF
select CLKSRC_MMIO
help
Enables the support for Milbeaut timer driver.
config INGENIC_TIMER
bool "Clocksource/timer using the TCU in Ingenic JZ SoCs"
default MACH_INGENIC
depends on MIPS || COMPILE_TEST
depends on COMMON_CLK
select MFD_SYSCON
select TIMER_OF
select IRQ_DOMAIN
help
Support for the timer/counter unit of the Ingenic JZ SoCs.
config INGENIC_OST
bool "Clocksource for Ingenic OS Timer"
depends on MIPS || COMPILE_TEST
depends on COMMON_CLK
select MFD_SYSCON
help
Support for the Operating System Timer of the Ingenic JZ SoCs.
config MICROCHIP_PIT64B
bool "Microchip PIT64B support"
depends on OF || COMPILE_TEST
select CLKSRC_MMIO
select TIMER_OF
help
This option enables Microchip PIT64B timer for Atmel
based system. It supports the oneshot, the periodic
modes and high resolution. It is used as a clocksource
and a clockevent.
endmenu
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