177 lines
4.7 KiB
Plaintext
177 lines
4.7 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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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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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 LOAPIC_TIMER_DIVIDER_UNSUPPORTED
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bool "LOAPIC timer divider unsupported"
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depends on LOAPIC_TIMER && MVIC && X86
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default n
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help
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This option selects if Local Apic Timer divider register is supported.
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The MVIC interrupt controller does not provide the Timer Divide
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Configuration Register (TDC).
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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 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_CORTEX_M
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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 NIOS2_AVALON_TIMER
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bool "Nios II 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 Nios II Avalon
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Interval Timer as described in the Embedded IP documentation. It
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provides the standard "system clock driver" interfaces.
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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 drivers on nanokernel
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initialization level might need the clock to be running already, you
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should let the default value as it is (0).
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endmenu
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