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