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c92e7ef164
Add a clocksource based on the goldfish-rtc device. Move the timer register definition to <clocksource/timer-goldfish.h> This kernel implementation is based on the QEMU upstream implementation: https://git.qemu.org/?p=qemu.git;a=blob_plain;f=hw/rtc/goldfish_rtc.c goldfish-timer is a high-precision signed 64-bit nanosecond timer. It is part of the 'goldfish' virtual hardware platform used to run some emulated Android systems under QEMU. This timer only supports oneshot event. Signed-off-by: Laurent Vivier <laurent@vivier.eu> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org> Link: https://lore.kernel.org/r/20220406201523.243733-4-laurent@vivier.eu Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
31 lines
1,007 B
C
31 lines
1,007 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* goldfish-timer clocksource
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* Registers definition for the goldfish-timer device
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*/
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#ifndef _CLOCKSOURCE_TIMER_GOLDFISH_H
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#define _CLOCKSOURCE_TIMER_GOLDFISH_H
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/*
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* TIMER_TIME_LOW get low bits of current time and update TIMER_TIME_HIGH
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* TIMER_TIME_HIGH get high bits of time at last TIMER_TIME_LOW read
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* TIMER_ALARM_LOW set low bits of alarm and activate it
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* TIMER_ALARM_HIGH set high bits of next alarm
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* TIMER_IRQ_ENABLED enable alarm interrupt
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* TIMER_CLEAR_ALARM disarm an existing alarm
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* TIMER_ALARM_STATUS alarm status (running or not)
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* TIMER_CLEAR_INTERRUPT clear interrupt
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*/
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#define TIMER_TIME_LOW 0x00
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#define TIMER_TIME_HIGH 0x04
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#define TIMER_ALARM_LOW 0x08
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#define TIMER_ALARM_HIGH 0x0c
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#define TIMER_IRQ_ENABLED 0x10
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#define TIMER_CLEAR_ALARM 0x14
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#define TIMER_ALARM_STATUS 0x18
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#define TIMER_CLEAR_INTERRUPT 0x1c
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extern int goldfish_timer_init(int irq, void __iomem *base);
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#endif /* _CLOCKSOURCE_TIMER_GOLDFISH_H */
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