1*300bb1feSJianyong Wu // SPDX-License-Identifier: GPL-2.0-only 2*300bb1feSJianyong Wu /* 3*300bb1feSJianyong Wu * Virtual PTP 1588 clock for use with KVM guests 4*300bb1feSJianyong Wu * Copyright (C) 2019 ARM Ltd. 5*300bb1feSJianyong Wu * All Rights Reserved 6*300bb1feSJianyong Wu */ 7*300bb1feSJianyong Wu 8*300bb1feSJianyong Wu #include <linux/arm-smccc.h> 9*300bb1feSJianyong Wu #include <linux/ptp_kvm.h> 10*300bb1feSJianyong Wu 11*300bb1feSJianyong Wu #include <asm/arch_timer.h> 12*300bb1feSJianyong Wu #include <asm/hypervisor.h> 13*300bb1feSJianyong Wu 14*300bb1feSJianyong Wu int kvm_arch_ptp_init(void) 15*300bb1feSJianyong Wu { 16*300bb1feSJianyong Wu int ret; 17*300bb1feSJianyong Wu 18*300bb1feSJianyong Wu ret = kvm_arm_hyp_service_available(ARM_SMCCC_KVM_FUNC_PTP); 19*300bb1feSJianyong Wu if (ret <= 0) 20*300bb1feSJianyong Wu return -EOPNOTSUPP; 21*300bb1feSJianyong Wu 22*300bb1feSJianyong Wu return 0; 23*300bb1feSJianyong Wu } 24*300bb1feSJianyong Wu 25*300bb1feSJianyong Wu int kvm_arch_ptp_get_clock(struct timespec64 *ts) 26*300bb1feSJianyong Wu { 27*300bb1feSJianyong Wu return kvm_arch_ptp_get_crosststamp(NULL, ts, NULL); 28*300bb1feSJianyong Wu } 29