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For platforms using the Arm Generic Timer, add precise cross-timestamping support to virtio_rtc. Always report the CP15 virtual counter as the HW counter in use by arm_arch_timer, since the Linux kernel's usage of the Arm Generic Timer should always be compatible with this. Signed-off-by: Peter Hilber <quic_philber@quicinc.com> Message-Id: <20250509160734.1772-4-quic_philber@quicinc.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
24 lines
518 B
C
24 lines
518 B
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Provides cross-timestamp params for Arm.
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*
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* Copyright (C) 2022-2023 OpenSynergy GmbH
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* Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved.
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*/
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#include <linux/clocksource_ids.h>
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#include <uapi/linux/virtio_rtc.h>
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#include "virtio_rtc_internal.h"
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/* see header for doc */
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int viortc_hw_xtstamp_params(u8 *hw_counter, enum clocksource_ids *cs_id)
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{
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*hw_counter = VIRTIO_RTC_COUNTER_ARM_VCT;
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*cs_id = CSID_ARM_ARCH_COUNTER;
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return 0;
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}
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