76 lines
2.6 KiB
C
76 lines
2.6 KiB
C
/* $NetBSD: dwc_tmr.c,v 1.1 2015/01/17 15:04:47 jmcneill Exp $ */
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/*-
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* Copyright (c) 2015 Jared D. McNeill <jmcneill@invisible.ca>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: dwc_tmr.c,v 1.1 2015/01/17 15:04:47 jmcneill Exp $");
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/device.h>
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#include <sys/intr.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/timetc.h>
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#include <dev/ic/dwc_tmr_reg.h>
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#include <dev/ic/dwc_tmr_var.h>
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#define TIMER_READ(sc, reg) \
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bus_space_read_4((sc)->sc_bst, (sc)->sc_bsh, (reg))
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#define TIMER_WRITE(sc, reg, val) \
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bus_space_write_4((sc)->sc_bst, (sc)->sc_bsh, (reg), (val))
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static u_int dwc_tmr_get_timecount(struct timecounter *);
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void
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dwc_tmr_attach_subr(struct dwc_tmr_softc *sc, u_int64_t freq)
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{
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TIMER_WRITE(sc, DWC_TMR_CONTROL_REG, 0);
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TIMER_WRITE(sc, DWC_TMR_LOAD_COUNT_REG, ~0);
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TIMER_WRITE(sc, DWC_TMR_CONTROL_REG, DWC_TMR_CONTROL_ENABLE);
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sc->sc_tc.tc_get_timecount = dwc_tmr_get_timecount;
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sc->sc_tc.tc_poll_pps = NULL;
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sc->sc_tc.tc_counter_mask = ~0;
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sc->sc_tc.tc_frequency = freq;
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sc->sc_tc.tc_name = device_xname(sc->sc_dev);
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sc->sc_tc.tc_priv = sc;
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sc->sc_tc.tc_quality = 900;
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tc_init(&sc->sc_tc);
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}
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static u_int
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dwc_tmr_get_timecount(struct timecounter *tc)
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{
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struct dwc_tmr_softc *sc = tc->tc_priv;
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return ~TIMER_READ(sc, DWC_TMR_CURRENT_VALUE_REG);
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}
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