1 /* $OpenBSD: acpitimer.c,v 1.11 2015/03/14 03:38:46 jsg Exp $ */ 2 /* 3 * Copyright (c) 2005 Thorsten Lockert <tholo@sigmasoft.com> 4 * 5 * Permission to use, copy, modify, and distribute this software for any 6 * purpose with or without fee is hereby granted, provided that the above 7 * copyright notice and this permission notice appear in all copies. 8 * 9 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 10 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 11 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 12 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 13 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 14 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 15 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 16 */ 17 18 #include <sys/param.h> 19 #include <sys/systm.h> 20 #include <sys/device.h> 21 #include <sys/timetc.h> 22 23 #include <machine/bus.h> 24 25 #include <dev/acpi/acpireg.h> 26 #include <dev/acpi/acpivar.h> 27 28 int acpitimermatch(struct device *, void *, void *); 29 void acpitimerattach(struct device *, struct device *, void *); 30 31 u_int acpi_get_timecount(struct timecounter *tc); 32 33 static struct timecounter acpi_timecounter = { 34 acpi_get_timecount, /* get_timecount */ 35 0, /* no poll_pps */ 36 0x00ffffff, /* counter_mask (24 bits) */ 37 ACPI_FREQUENCY, /* frequency */ 38 0, /* name */ 39 1000 /* quality */ 40 }; 41 42 struct acpitimer_softc { 43 struct device sc_dev; 44 45 bus_space_tag_t sc_iot; 46 bus_space_handle_t sc_ioh; 47 }; 48 49 struct cfattach acpitimer_ca = { 50 sizeof(struct acpitimer_softc), acpitimermatch, acpitimerattach 51 }; 52 53 struct cfdriver acpitimer_cd = { 54 NULL, "acpitimer", DV_DULL 55 }; 56 57 int 58 acpitimermatch(struct device *parent, void *match, void *aux) 59 { 60 struct acpi_attach_args *aa = aux; 61 struct cfdata *cf = match; 62 63 /* sanity */ 64 if (aa->aaa_name == NULL || 65 strcmp(aa->aaa_name, cf->cf_driver->cd_name) != 0 || 66 aa->aaa_table != NULL) 67 return (0); 68 69 return (1); 70 } 71 72 void 73 acpitimerattach(struct device *parent, struct device *self, void *aux) 74 { 75 struct acpitimer_softc *sc = (struct acpitimer_softc *) self; 76 struct acpi_softc *psc = (struct acpi_softc *) parent; 77 int rc; 78 79 if (psc->sc_fadt->hdr_revision >= 3 && 80 psc->sc_fadt->x_pm_tmr_blk.address != 0) 81 rc = acpi_map_address(psc, &psc->sc_fadt->x_pm_tmr_blk, 0, 82 psc->sc_fadt->pm_tmr_len, &sc->sc_ioh, &sc->sc_iot); 83 else 84 rc = acpi_map_address(psc, NULL, psc->sc_fadt->pm_tmr_blk, 85 psc->sc_fadt->pm_tmr_len, &sc->sc_ioh, &sc->sc_iot); 86 if (rc) { 87 printf(": can't map i/o space\n"); 88 return; 89 } 90 91 printf(": %d Hz, %d bits\n", ACPI_FREQUENCY, 92 psc->sc_fadt->flags & FADT_TMR_VAL_EXT ? 32 : 24); 93 94 if (psc->sc_fadt->flags & FADT_TMR_VAL_EXT) 95 acpi_timecounter.tc_counter_mask = 0xffffffffU; 96 acpi_timecounter.tc_priv = sc; 97 acpi_timecounter.tc_name = sc->sc_dev.dv_xname; 98 tc_init(&acpi_timecounter); 99 } 100 101 102 u_int 103 acpi_get_timecount(struct timecounter *tc) 104 { 105 struct acpitimer_softc *sc = tc->tc_priv; 106 u_int u1, u2, u3; 107 108 u2 = bus_space_read_4(sc->sc_iot, sc->sc_ioh, 0); 109 u3 = bus_space_read_4(sc->sc_iot, sc->sc_ioh, 0); 110 do { 111 u1 = u2; 112 u2 = u3; 113 u3 = bus_space_read_4(sc->sc_iot, sc->sc_ioh, 0); 114 } while (u1 > u2 || u2 > u3); 115 116 return (u2); 117 } 118