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# Kconfig - timer driver configuration options
#
# Copyright (c) 2014-2015 Wind River Systems, Inc.
# Copyright (c) 2016 Cadence Design Systems, Inc.
#
# SPDX-License-Identifier: Apache-2.0
#
menu "Timer Drivers"
config HPET_TIMER
bool "HPET timer"
default n
depends on X86
select IOAPIC
select LOAPIC
select TIMER_READS_ITS_FREQUENCY_AT_RUNTIME
help
This option selects High Precision Event Timer (HPET) as a
system timer.
config HPET_TIMER_LEGACY_EMULATION
bool "HPET timer legacy emulation mode"
default n
depends on HPET_TIMER
help
This option switches HPET to legacy emulation mode.
In this mode 8254 PIT is disabled, HPET timer0 is connected
to IOAPIC IRQ2, timer1 -- to IOAPIC IRQ8.
config HPET_TIMER_DEBUG
bool "Enable HPET debug output"
default n
depends on HPET_TIMER && PRINTK
help
This option enables HPET debugging output.
config HPET_TIMER_BASE_ADDRESS
hex "HPET Base Address"
default 0xFED00000
depends on HPET_TIMER
help
This options specifies the base address of the HPET timer device.
config HPET_TIMER_IRQ
int "HPET Timer IRQ"
default 20
depends on HPET_TIMER
help
This option specifies the IRQ used by the HPET timer.
config HPET_TIMER_IRQ_PRIORITY
int "HPET Timer IRQ Priority"
default 4
depends on HPET_TIMER
help
This option specifies the IRQ priority used by the HPET timer.
choice
depends on HPET_TIMER
prompt "HPET Interrupt Trigger Condition"
default HPET_TIMER_FALLING_EDGE
config HPET_TIMER_FALLING_EDGE
bool "Falling Edge"
help
This option signifies that the HPET timer uses falling edge interrupts.
config HPET_TIMER_RISING_EDGE
bool "Rising Edge"
help
This option signifies that the HPET timer uses rising edge interrupts.
config HPET_TIMER_LEVEL_HIGH
bool "Level High"
help
This option signifies that the HPET timer uses level high interrupts.
config HPET_TIMER_LEVEL_LOW
bool "Level Low"
help
This option signifies that the HPET timer uses level low interrupts.
endchoice
config LOAPIC_TIMER
bool "LOAPIC timer"
depends on (LOAPIC || MVIC) && X86
default n
help
This option selects LOAPIC timer as a system timer.
config LOAPIC_TIMER_IRQ
int "Local APIC Timer IRQ"
default 24
depends on LOAPIC_TIMER
help
This option specifies the IRQ used by the LOAPIC timer.
config LOAPIC_TIMER_IRQ_PRIORITY
int "Local APIC Timer IRQ Priority"
default 2
depends on LOAPIC_TIMER
help
This options specifies the IRQ priority used by the LOAPIC timer.
config TSC_CYCLES_PER_SEC
int
prompt "Frequency of x86 CPU timestamp counter"
default 0
depends on LOAPIC_TIMER
help
The x86 implementation of LOAPIC k_cycle_get_32() relies on the x86 TSC.
This runs at the CPU speed and not the bus speed. If set to 0, the
value of CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC will be used instead;
many MCUs these values are the same.
config ARCV2_TIMER
bool "ARC Timer"
default y
depends on ARC
help
This module implements a kernel device driver for the ARCv2 processor timer 0
and provides the standard "system clock driver" interfaces.
config ARCV2_TIMER_IRQ_PRIORITY
int "ARC timer interrupt priority"
default 0
depends on ARCV2_TIMER
help
This option specifies the IRQ priority used by the ARC timer. Lower
values have higher priority.
config CORTEX_M_SYSTICK
bool "Cortex-M SYSTICK timer"
default y
depends on CPU_HAS_SYSTICK
help
This module implements a kernel device driver for the Cortex-M processor
SYSTICK timer and provides the standard "system clock driver" interfaces.
config ALTERA_AVALON_TIMER
bool "Altera Avalon Interval Timer"
default y
depends on NIOS2
help
This module implements a kernel device driver for the Altera Avalon
Interval Timer as described in the Embedded IP documentation, for use
with Nios II and possibly other Altera soft CPUs. It provides the
standard "system clock driver" interfaces.
config NRF_RTC_TIMER
bool "nRF Real Time Counter (NRF_RTC1) Timer"
default y
depends on SOC_FAMILY_NRF5 && CLOCK_CONTROL_NRF5
help
This module implements a kernel device driver for the nRF Real Time
Counter NRF_RTC1 and provides the standard "system clock driver"
interfaces.
config PULPINO_TIMER
bool "pulpino Timer"
default y
depends on SOC_RISCV32_PULPINO
help
This module implements a kernel device driver for the pulpino processor
timer driver. It provides the standard "system clock driver" interfaces.
config RISCV_MACHINE_TIMER
bool "RISCV Machine Timer"
default n
depends on SOC_FAMILY_RISCV_PRIVILEGE
help
This module implements a kernel device driver for the generic RISCV machine
timer driver. It provides the standard "system clock driver" interfaces.
config XTENSA_TIMER
bool "Xtensa timer support"
depends on XTENSA
default y
help
This module implements a kernel device driver for the Xtensa processor and
provides the standard "system clock driver" interfaces.
If unchecked, no timer will be used.
If checked it will use either an internal timer (default option) or an
external timer. In that case one shall unselect XTENSA_INTERNAL_TIMER and
define XTENSA_TIMER_IRQ and XTENSA_TIMER_IRQ_PRIORITY.
config XTENSA_INTERNAL_TIMER
bool "Xtensa internal timer"
depends on XTENSA_TIMER
default y
help
This module implements a kernel device driver for the Xtensa processor
internal timer and provides the standard "system clock driver" interfaces.
If unchecked, an external timer will be used. It will rely on a tick
interrupt connected to an IRQ line. In this case one shall define
both XTENSA_TIMER_IRQ and XTENSA_TIMER_IRQ_PRIORITY.
config XTENSA_TIMER_IRQ
int "Xtensa external timer interrupt number"
depends on XTENSA_TIMER && !XTENSA_INTERNAL_TIMER
range -1 31
default -1
help
This is the number of interrupt line used by the external timer.
The special value of -1 allows using the internal timer in order to
emulate an external timer. This is generally useful for running the project on
a simulator where it is hard to emulate an external interrupt.
config XTENSA_TIMER_IRQ_PRIORITY
int "Xtensa external timer interrupt priority"
depends on XTENSA_TIMER && !XTENSA_INTERNAL_TIMER
range 1 6
default 1
help
This is the priority of interrupt line.
config SYSTEM_CLOCK_DISABLE
bool "API to disable system clock"
default n
help
This option enables the sys_clock_disable() API in the kernel. It is
needed by some subsystems (which will automatically select it), but is
rarely needed by applications.
config TIMER_READS_ITS_FREQUENCY_AT_RUNTIME
bool "Timer queries its hardware to find its frequency at runtime"
default n
help
The drivers select this option automatically when needed. Do not modify
this unless you have a very good reason for it.
config SYSTEM_CLOCK_INIT_PRIORITY
int "System clock driver initialization priority"
default 0
help
This options can be used to set a specific initialization priority
value for the system clock driver. As driver initialization might need
the clock to be running already, you should let the default value as it
is (0).
endmenu