| # Kconfig - timer driver configuration options |
| |
| # |
| # Copyright (c) 2014-2015 Wind River Systems, Inc. |
| # |
| # Licensed under the Apache License, Version 2.0 (the "License"); |
| # you may not use this file except in compliance with the License. |
| # You may obtain a copy of the License at |
| # |
| # http://www.apache.org/licenses/LICENSE-2.0 |
| # |
| # Unless required by applicable law or agreed to in writing, software |
| # distributed under the License is distributed on an "AS IS" BASIS, |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| # See the License for the specific language governing permissions and |
| # limitations under the License. |
| # |
| |
| |
| 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 LOAPIC_TIMER_DIVIDER_UNSUPPORTED |
| bool "LOAPIC timer divider unsupported" |
| depends on LOAPIC_TIMER && MVIC && X86 |
| default n |
| help |
| This option selects if Local Apic Timer divider register is supported. |
| |
| The MVIC interrupt controller does not provide the Timer Divide |
| Configuration Register (TDC). |
| |
| 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 CORTEX_M_SYSTICK |
| bool "Cortex-M SYSTICK timer" |
| default y |
| depends on CPU_CORTEX_M |
| 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 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 drivers on nanokernel |
| initialization level might need the clock to be running already, you |
| should let the default value as it is (0). |
| endmenu |
