acpi_hpet.c revision 151935
1151912Sphk/*- 2151912Sphk * Copyright (c) 2005 Poul-Henning Kamp 3151912Sphk * All rights reserved. 4151912Sphk * 5151912Sphk * Redistribution and use in source and binary forms, with or without 6151912Sphk * modification, are permitted provided that the following conditions 7151912Sphk * are met: 8151912Sphk * 1. Redistributions of source code must retain the above copyright 9151912Sphk * notice, this list of conditions and the following disclaimer. 10151912Sphk * 2. Redistributions in binary form must reproduce the above copyright 11151912Sphk * notice, this list of conditions and the following disclaimer in the 12151912Sphk * documentation and/or other materials provided with the distribution. 13151912Sphk * 14151912Sphk * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15151912Sphk * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16151912Sphk * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17151912Sphk * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18151912Sphk * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19151912Sphk * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20151912Sphk * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21151912Sphk * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22151912Sphk * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23151912Sphk * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24151912Sphk * SUCH DAMAGE. 25151912Sphk */ 26151912Sphk 27151912Sphk#include <sys/cdefs.h> 28151912Sphk__FBSDID("$FreeBSD: head/sys/dev/acpica/acpi_hpet.c 151935 2005-11-01 20:41:43Z scottl $"); 29151912Sphk 30151912Sphk#include "opt_acpi.h" 31151912Sphk#include <sys/param.h> 32151912Sphk#include <sys/kernel.h> 33151912Sphk#include <sys/module.h> 34151912Sphk#include <sys/rman.h> 35151912Sphk#include <sys/time.h> 36151912Sphk#include <sys/timetc.h> 37151912Sphk#include <sys/bus.h> 38151912Sphk#include <contrib/dev/acpica/acpi.h> 39151912Sphk#include "acpi_if.h" 40151912Sphk#include <dev/acpica/acpivar.h> 41151912Sphk 42151912SphkACPI_SERIAL_DECL(hpet, "ACPI HPET support"); 43151912Sphk 44151931Sscottl/* ACPI CA debugging */ 45151935Sscottl#define _COMPONENT ACPI_TIMER 46151931SscottlACPI_MODULE_NAME("HPET") 47151931Sscottl 48151912Sphkstruct acpi_hpet_softc { 49151912Sphk device_t dev; 50151912Sphk struct resource *res[1]; 51151912Sphk ACPI_HANDLE handle; 52151912Sphk}; 53151912Sphk 54151912Sphkstatic unsigned hpet_get_timecount(struct timecounter *tc); 55151912Sphk 56151912Sphkstruct timecounter hpet_timecounter = { 57151912Sphk .tc_get_timecount = hpet_get_timecount, 58151912Sphk .tc_counter_mask = ~0u, 59151912Sphk .tc_name = "HPET", 60151912Sphk .tc_quality = -200, 61151912Sphk}; 62151912Sphk 63151912Sphkstatic char *hpet_ids[] = { "PNP0103", NULL }; 64151912Sphk 65151912Sphkstatic unsigned 66151912Sphkhpet_get_timecount(struct timecounter *tc) 67151912Sphk{ 68151912Sphk struct acpi_hpet_softc *sc; 69151912Sphk 70151912Sphk sc = tc->tc_priv; 71151912Sphk return (bus_read_4(sc->res[0], 0xf0)); 72151912Sphk} 73151912Sphk 74151912Sphkstatic int 75151912Sphkacpi_hpet_probe(device_t dev) 76151912Sphk{ 77151912Sphk if (acpi_disabled("hpet") || 78151912Sphk ACPI_ID_PROBE(device_get_parent(dev), dev, hpet_ids) == NULL || 79151912Sphk device_get_unit(dev) != 0) 80151912Sphk return (ENXIO); 81151912Sphk 82151912Sphk device_set_desc(dev, "HPET - High Precision Event Timers"); 83151912Sphk return (0); 84151912Sphk} 85151912Sphk 86151912Sphkstatic struct resource_spec hpet_res_spec[] = { 87151912Sphk { SYS_RES_MEMORY, 0, RF_ACTIVE}, 88151912Sphk { -1, 0, 0} 89151912Sphk}; 90151912Sphk 91151912Sphkstatic int 92151912Sphkacpi_hpet_attach(device_t dev) 93151912Sphk{ 94151912Sphk struct acpi_hpet_softc *sc; 95151912Sphk int error; 96151912Sphk uint32_t u; 97151912Sphk 98151912Sphk ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__); 99151912Sphk 100151912Sphk sc = device_get_softc(dev); 101151912Sphk sc->dev = dev; 102151912Sphk sc->handle = acpi_get_handle(dev); 103151912Sphk 104151912Sphk error = bus_alloc_resources(dev, hpet_res_spec, sc->res); 105151912Sphk if (error) 106151912Sphk return (error); 107151912Sphk 108151912Sphk u = bus_read_4(sc->res[0], 0x0); 109151912Sphk device_printf(dev, "Vendor: 0x%x\n", u >> 16); 110151912Sphk device_printf(dev, "Leg_Route_Cap: %d\n", (u >> 15) & 1); 111151912Sphk device_printf(dev, "Count_Size_Cap: %d\n", (u >> 13) & 1); 112151912Sphk device_printf(dev, "Num_Tim_Cap: %d\n", (u >> 18) & 0xf); 113151912Sphk device_printf(dev, "Rev_id: 0x%x\n", u & 0xff); 114151912Sphk 115151912Sphk u = bus_read_4(sc->res[0], 0x4); 116151912Sphk device_printf(dev, "Period: %d fs (%jd Hz)\n", 117151912Sphk u, (intmax_t)((1000000000000000LL + u / 2) / u)); 118151912Sphk 119151912Sphk hpet_timecounter.tc_frequency = (1000000000000000LL + u / 2) / u; 120151912Sphk 121151912Sphk bus_write_4(sc->res[0], 0x10, 1); 122151912Sphk 123151912Sphk#if 0 124151912Sphk { 125151912Sphk int i; 126151912Sphk uint32_t u1, u2; 127151912Sphk struct bintime b0, b1, b2; 128151912Sphk struct timespec ts; 129151912Sphk 130151912Sphk binuptime(&b0); 131151912Sphk binuptime(&b0); 132151912Sphk binuptime(&b1); 133151912Sphk u1 = bus_read_4(sc->res[0], 0xf0); 134151912Sphk for (i = 1; i < 1000; i++) 135151912Sphk u2 = bus_read_4(sc->res[0], 0xf0); 136151912Sphk binuptime(&b2); 137151912Sphk u2 = bus_read_4(sc->res[0], 0xf0); 138151912Sphk 139151912Sphk bintime_sub(&b2, &b1); 140151912Sphk bintime_sub(&b1, &b0); 141151912Sphk bintime_sub(&b2, &b1); 142151912Sphk bintime2timespec(&b2, &ts); 143151912Sphk 144151912Sphk device_printf(dev, "%ld.%09ld: %u ... %u = %u\n", 145151912Sphk (long)ts.tv_sec, ts.tv_nsec, u1, u2, u2 - u1); 146151912Sphk 147151912Sphk device_printf(dev, "time per call: %ld ns\n", ts.tv_nsec / 1000); 148151912Sphk } 149151912Sphk#endif 150151912Sphk 151151912Sphk device_printf(sc->dev, "HPET attach\n"); 152151912Sphk 153151912Sphk hpet_timecounter.tc_priv = sc; 154151912Sphk 155151912Sphk tc_init(&hpet_timecounter); 156151912Sphk 157151912Sphk return (0); 158151912Sphk} 159151912Sphk 160151912Sphkstatic int 161151912Sphkacpi_hpet_detach(device_t dev) 162151912Sphk{ 163151912Sphk ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__); 164151912Sphk 165151912Sphk#if 1 166151912Sphk return (EBUSY); 167151912Sphk#else 168151912Sphk struct acpi_hpet_softc *sc = device_get_softc(dev); 169151912Sphk bus_release_resources(dev, hpet_res_spec, sc->res); 170151912Sphk 171151912Sphk device_printf(sc->dev, "HPET detach\n"); 172151912Sphk return (0); 173151912Sphk#endif 174151912Sphk} 175151912Sphk 176151912Sphkstatic device_method_t acpi_hpet_methods[] = { 177151912Sphk /* Device interface */ 178151912Sphk DEVMETHOD(device_probe, acpi_hpet_probe), 179151912Sphk DEVMETHOD(device_attach, acpi_hpet_attach), 180151912Sphk DEVMETHOD(device_detach, acpi_hpet_detach), 181151912Sphk 182151912Sphk {0, 0} 183151912Sphk}; 184151912Sphk 185151912Sphkstatic driver_t acpi_hpet_driver = { 186151912Sphk "acpi_hpet", 187151912Sphk acpi_hpet_methods, 188151912Sphk sizeof(struct acpi_hpet_softc), 189151912Sphk}; 190151912Sphk 191151912Sphkstatic devclass_t acpi_hpet_devclass; 192151912Sphk 193151912SphkDRIVER_MODULE(acpi_hpet, acpi, acpi_hpet_driver, acpi_hpet_devclass, 0, 0); 194151912SphkMODULE_DEPEND(acpi_hpet, acpi, 1, 1, 1); 195