| # 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" |
| |
| menuconfig HPET_TIMER |
| bool "HPET timer" |
| depends on (X86 || X86_64) |
| select IOAPIC if X86 |
| select LOAPIC if X86 |
| select TIMER_READS_ITS_FREQUENCY_AT_RUNTIME |
| select TICKLESS_CAPABLE |
| help |
| This option selects High Precision Event Timer (HPET) as a |
| system timer. |
| |
| if HPET_TIMER |
| config HPET_TIMER_BASE_ADDRESS |
| hex "HPET Base Address" |
| default 0xFED00000 |
| help |
| This options specifies the base address of the HPET timer device. |
| |
| config HPET_TIMER_IRQ |
| int "HPET Timer IRQ" |
| default 2 |
| help |
| This option specifies the IRQ used by the HPET timer. |
| |
| config HPET_TIMER_IRQ_PRIORITY |
| int "HPET Timer IRQ Priority" |
| default 4 |
| help |
| This option specifies the IRQ priority used by the HPET timer. |
| |
| endif #HPET_TIMER |
| |
| menuconfig LOAPIC_TIMER |
| bool "LOAPIC timer" |
| depends on (LOAPIC || MVIC) && X86 |
| help |
| This option selects LOAPIC timer as a system timer. |
| |
| if LOAPIC_TIMER |
| config LOAPIC_TIMER_IRQ |
| int "Local APIC Timer IRQ" |
| default 24 |
| help |
| This option specifies the IRQ used by the LOAPIC timer. |
| |
| config LOAPIC_TIMER_IRQ_PRIORITY |
| int "Local APIC Timer IRQ Priority" |
| default 2 |
| help |
| This options specifies the IRQ priority used by the LOAPIC timer. |
| |
| config TSC_CYCLES_PER_SEC |
| int "Frequency of x86 CPU timestamp counter" |
| default 0 |
| 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. |
| |
| endif #LOAPIC_TIMER |
| |
| menuconfig ARCV2_TIMER |
| bool "ARC Timer" |
| default y |
| depends on ARC |
| select TICKLESS_CAPABLE |
| 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 |
| select TICKLESS_CAPABLE |
| 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 CLOCK_CONTROL |
| depends on SOC_COMPATIBLE_NRF |
| select TICKLESS_CAPABLE |
| 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 RISCV_MACHINE_TIMER |
| bool "RISCV Machine Timer" |
| depends on SOC_FAMILY_RISCV_PRIVILEGE |
| select TICKLESS_CAPABLE |
| help |
| This module implements a kernel device driver for the generic RISCV machine |
| timer driver. It provides the standard "system clock driver" interfaces. |
| |
| config RV32M1_LPTMR_TIMER |
| bool "RV32M1 LPTMR system timer driver" |
| default y |
| depends on SOC_OPENISA_RV32M1_RISCV32 |
| depends on !TICKLESS_IDLE |
| depends on RV32M1_INTMUX |
| help |
| This module implements a kernel device driver for using the LPTMR |
| peripheral as the system clock. It provides the standard "system clock |
| driver" interfaces. |
| |
| config NATIVE_POSIX_TIMER |
| bool "(POSIX) native_posix timer driver" |
| default y |
| depends on BOARD_NATIVE_POSIX |
| help |
| This module implements a kernel device driver for the native_posix HW timer |
| model |
| |
| config XTENSA_TIMER |
| bool "Xtensa timer support" |
| depends on XTENSA |
| default y |
| select TICKLESS_CAPABLE |
| help |
| Enables a system timer driver for Xtensa based on the CCOUNT |
| and CCOMPARE special registers. |
| |
| config XTENSA_TIMER_ID |
| int "System timer CCOMPAREn register index" |
| default 1 |
| depends on XTENSA_TIMER |
| help |
| Index of the CCOMPARE register (and associated interrupt) |
| used for the system timer. Xtensa CPUs have hard-configured |
| interrupt priorities associated with each timer, and some of |
| them can be unmaskable (and thus not usable by OS code that |
| need synchronization, like the timer subsystem!). Choose |
| carefully. Generally you want the timer with the highest |
| priority maskable interrupt. |
| |
| config SAM0_RTC_TIMER |
| bool "Atmel SAM0 series RTC timer" |
| depends on SOC_FAMILY_SAM0 |
| select TICKLESS_CAPABLE |
| help |
| This module implements a kernel device driver for the Atmel SAM0 |
| series Real Time Counter and provides the standard "system clock |
| driver" interfaces. |
| |
| config SYSTEM_CLOCK_DISABLE |
| bool "API to disable system clock" |
| 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" |
| 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). |
| |
| config TICKLESS_CAPABLE |
| bool "Timer driver supports tickless operation" |
| help |
| Timer drivers should select this flag if they are capable of |
| supporting tickless operation. That is, a call to |
| z_clock_set_timeout() with a number of ticks greater than |
| one should be expected not to produce a call to |
| z_clock_announce() (really, not to produce an interrupt at |
| all) until the specified expiration. |
| |
| config QEMU_TICKLESS_WORKAROUND |
| bool "Disable tickless on qemu due to asynchrony bug" |
| depends on QEMU_TARGET && TICKLESS_KERNEL |
| help |
| Qemu (without -icount) has trouble keeping time when the |
| host process needs to timeshare. The host OS will routinely |
| schedule out a process at timescales equivalent to the guest |
| tick rate. With traditional ticks delivered regularly by |
| the hardware, that's mostly OK as it looks like a late |
| interrupt. But in tickless mode, the driver needs some CPU |
| in order to schedule the tick in the first place. If that |
| gets delayed across a tick boundary, time gets wonky. This |
| tunable is a hint to the driver to disable tickless |
| accounting on qemu. Use it only on tests that are known to |
| have problems. |
| |
| endmenu |
