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author | phk <phk@FreeBSD.org> | 2005-10-31 21:39:50 +0000 |
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committer | phk <phk@FreeBSD.org> | 2005-10-31 21:39:50 +0000 |
commit | f3ccb3e48f610da852d54776b8a1b03df75d51ec (patch) | |
tree | 9c3b484bf064d01280eda6cc546734db611ce32c /sys | |
parent | 6ce4d2f51a51d0b643cef2918b92238bdeb9a572 (diff) | |
download | FreeBSD-src-f3ccb3e48f610da852d54776b8a1b03df75d51ec.zip FreeBSD-src-f3ccb3e48f610da852d54776b8a1b03df75d51ec.tar.gz |
Add a basic HPET timecounter.
It has -200 quality for now so it will not get automatically selected.
Diffstat (limited to 'sys')
-rw-r--r-- | sys/dev/acpica/acpi_hpet.c | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/sys/dev/acpica/acpi_hpet.c b/sys/dev/acpica/acpi_hpet.c new file mode 100644 index 0000000..6db5f5f --- /dev/null +++ b/sys/dev/acpica/acpi_hpet.c @@ -0,0 +1,190 @@ +/*- + * Copyright (c) 2005 Poul-Henning Kamp + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include "opt_acpi.h" +#include <sys/param.h> +#include <sys/kernel.h> +#include <sys/module.h> +#include <sys/rman.h> +#include <sys/time.h> +#include <sys/timetc.h> +#include <sys/bus.h> +#include <contrib/dev/acpica/acpi.h> +#include "acpi_if.h" +#include <dev/acpica/acpivar.h> + +ACPI_SERIAL_DECL(hpet, "ACPI HPET support"); + +struct acpi_hpet_softc { + device_t dev; + struct resource *res[1]; + ACPI_HANDLE handle; +}; + +static unsigned hpet_get_timecount(struct timecounter *tc); + +struct timecounter hpet_timecounter = { + .tc_get_timecount = hpet_get_timecount, + .tc_counter_mask = ~0u, + .tc_name = "HPET", + .tc_quality = -200, +}; + +static char *hpet_ids[] = { "PNP0103", NULL }; + +static unsigned +hpet_get_timecount(struct timecounter *tc) +{ + struct acpi_hpet_softc *sc; + + sc = tc->tc_priv; + return (bus_read_4(sc->res[0], 0xf0)); +} + +static int +acpi_hpet_probe(device_t dev) +{ + if (acpi_disabled("hpet") || + ACPI_ID_PROBE(device_get_parent(dev), dev, hpet_ids) == NULL || + device_get_unit(dev) != 0) + return (ENXIO); + + device_set_desc(dev, "HPET - High Precision Event Timers"); + return (0); +} + +static struct resource_spec hpet_res_spec[] = { + { SYS_RES_MEMORY, 0, RF_ACTIVE}, + { -1, 0, 0} +}; + +static int +acpi_hpet_attach(device_t dev) +{ + struct acpi_hpet_softc *sc; + int error; + uint32_t u; + + ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__); + + sc = device_get_softc(dev); + sc->dev = dev; + sc->handle = acpi_get_handle(dev); + + error = bus_alloc_resources(dev, hpet_res_spec, sc->res); + if (error) + return (error); + + u = bus_read_4(sc->res[0], 0x0); + device_printf(dev, "Vendor: 0x%x\n", u >> 16); + device_printf(dev, "Leg_Route_Cap: %d\n", (u >> 15) & 1); + device_printf(dev, "Count_Size_Cap: %d\n", (u >> 13) & 1); + device_printf(dev, "Num_Tim_Cap: %d\n", (u >> 18) & 0xf); + device_printf(dev, "Rev_id: 0x%x\n", u & 0xff); + + u = bus_read_4(sc->res[0], 0x4); + device_printf(dev, "Period: %d fs (%jd Hz)\n", + u, (intmax_t)((1000000000000000LL + u / 2) / u)); + + hpet_timecounter.tc_frequency = (1000000000000000LL + u / 2) / u; + + bus_write_4(sc->res[0], 0x10, 1); + +#if 0 + { + int i; + uint32_t u1, u2; + struct bintime b0, b1, b2; + struct timespec ts; + + binuptime(&b0); + binuptime(&b0); + binuptime(&b1); + u1 = bus_read_4(sc->res[0], 0xf0); + for (i = 1; i < 1000; i++) + u2 = bus_read_4(sc->res[0], 0xf0); + binuptime(&b2); + u2 = bus_read_4(sc->res[0], 0xf0); + + bintime_sub(&b2, &b1); + bintime_sub(&b1, &b0); + bintime_sub(&b2, &b1); + bintime2timespec(&b2, &ts); + + device_printf(dev, "%ld.%09ld: %u ... %u = %u\n", + (long)ts.tv_sec, ts.tv_nsec, u1, u2, u2 - u1); + + device_printf(dev, "time per call: %ld ns\n", ts.tv_nsec / 1000); + } +#endif + + device_printf(sc->dev, "HPET attach\n"); + + hpet_timecounter.tc_priv = sc; + + tc_init(&hpet_timecounter); + + return (0); +} + +static int +acpi_hpet_detach(device_t dev) +{ + ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__); + +#if 1 + return (EBUSY); +#else + struct acpi_hpet_softc *sc = device_get_softc(dev); + bus_release_resources(dev, hpet_res_spec, sc->res); + + device_printf(sc->dev, "HPET detach\n"); + return (0); +#endif +} + +static device_method_t acpi_hpet_methods[] = { + /* Device interface */ + DEVMETHOD(device_probe, acpi_hpet_probe), + DEVMETHOD(device_attach, acpi_hpet_attach), + DEVMETHOD(device_detach, acpi_hpet_detach), + + {0, 0} +}; + +static driver_t acpi_hpet_driver = { + "acpi_hpet", + acpi_hpet_methods, + sizeof(struct acpi_hpet_softc), +}; + +static devclass_t acpi_hpet_devclass; + +DRIVER_MODULE(acpi_hpet, acpi, acpi_hpet_driver, acpi_hpet_devclass, 0, 0); +MODULE_DEPEND(acpi_hpet, acpi, 1, 1, 1); |