260 lines
7.0 KiB
C
260 lines
7.0 KiB
C
/*-
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* Copyright (c) 2005 Poul-Henning Kamp
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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 AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, 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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__FBSDID("$FreeBSD$");
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#include "opt_acpi.h"
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/rman.h>
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#include <sys/time.h>
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#include <sys/timetc.h>
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#include <contrib/dev/acpica/acpi.h>
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#include <dev/acpica/acpivar.h>
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ACPI_SERIAL_DECL(hpet, "ACPI HPET support");
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static devclass_t acpi_hpet_devclass;
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/* ACPI CA debugging */
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#define _COMPONENT ACPI_TIMER
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ACPI_MODULE_NAME("HPET")
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struct acpi_hpet_softc {
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device_t dev;
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struct resource *mem_res;
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ACPI_HANDLE handle;
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};
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static u_int hpet_get_timecount(struct timecounter *tc);
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static void acpi_hpet_test(struct acpi_hpet_softc *sc);
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static char *hpet_ids[] = { "PNP0103", NULL };
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#define HPET_MEM_WIDTH 0x400 /* Expected memory region size */
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#define HPET_OFFSET_INFO 0 /* Location of info in region */
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#define HPET_OFFSET_PERIOD 4 /* Location of period (1/hz) */
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#define HPET_OFFSET_ENABLE 0x10 /* Location of enable word */
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#define HPET_OFFSET_VALUE 0xf0 /* Location of actual timer value */
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#define DEV_HPET(x) (acpi_get_magic(x) == (uintptr_t)&acpi_hpet_devclass)
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struct timecounter hpet_timecounter = {
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.tc_get_timecount = hpet_get_timecount,
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.tc_counter_mask = ~0u,
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.tc_name = "HPET",
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.tc_quality = 2000,
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};
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static u_int
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hpet_get_timecount(struct timecounter *tc)
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{
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struct acpi_hpet_softc *sc;
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sc = tc->tc_priv;
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return (bus_read_4(sc->mem_res, HPET_OFFSET_VALUE));
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}
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/* Discover the HPET via the ACPI table of the same name. */
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void
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acpi_hpet_table_probe(device_t parent)
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{
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ACPI_TABLE_HPET *hpet;
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ACPI_TABLE_HEADER *hdr;
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ACPI_STATUS status;
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device_t child;
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/* Currently, ID and minimum clock tick info is unused. */
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status = AcpiGetTable(ACPI_SIG_HPET, 1, (ACPI_TABLE_HEADER **)&hdr);
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if (ACPI_FAILURE(status))
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return;
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/*
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* The unit number could be derived from hdr->Sequence but we only
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* support one HPET device.
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*/
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hpet = (ACPI_TABLE_HPET *)hdr;
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if (hpet->Sequence != 0)
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printf("ACPI HPET table warning: Sequence is non-zero (%d)\n",
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hpet->Sequence);
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child = BUS_ADD_CHILD(parent, 0, "acpi_hpet", 0);
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if (child == NULL) {
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printf("%s: can't add child\n", __func__);
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return;
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}
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/* Record a magic value so we can detect this device later. */
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acpi_set_magic(child, (uintptr_t)&acpi_hpet_devclass);
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bus_set_resource(child, SYS_RES_MEMORY, 0, hpet->Address.Address,
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HPET_MEM_WIDTH);
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if (device_probe_and_attach(child) != 0)
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device_delete_child(parent, child);
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}
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static int
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acpi_hpet_probe(device_t dev)
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{
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ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__);
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if (acpi_disabled("hpet"))
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return (ENXIO);
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if (!DEV_HPET(dev) &&
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(ACPI_ID_PROBE(device_get_parent(dev), dev, hpet_ids) == NULL ||
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device_get_unit(dev) != 0))
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return (ENXIO);
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device_set_desc(dev, "High Precision Event Timer");
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return (0);
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}
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static int
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acpi_hpet_attach(device_t dev)
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{
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struct acpi_hpet_softc *sc;
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int rid;
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uint32_t val;
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uintmax_t freq;
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ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__);
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sc = device_get_softc(dev);
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sc->dev = dev;
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sc->handle = acpi_get_handle(dev);
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rid = 0;
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sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
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RF_ACTIVE);
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if (sc->mem_res == NULL)
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return (ENOMEM);
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/* Validate that we can access the whole region. */
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if (rman_get_size(sc->mem_res) < HPET_MEM_WIDTH) {
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device_printf(dev, "memory region width %ld too small\n",
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rman_get_size(sc->mem_res));
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bus_free_resource(dev, SYS_RES_MEMORY, sc->mem_res);
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return (ENXIO);
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}
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/* Read basic statistics about the timer. */
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val = bus_read_4(sc->mem_res, HPET_OFFSET_PERIOD);
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freq = (1000000000000000LL + val / 2) / val;
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if (bootverbose) {
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val = bus_read_4(sc->mem_res, HPET_OFFSET_INFO);
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device_printf(dev,
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"vend: 0x%x rev: 0x%x num: %d hz: %jd opts:%s%s\n",
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val >> 16, val & 0xff, (val >> 18) & 0xf, freq,
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((val >> 15) & 1) ? " leg_route" : "",
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((val >> 13) & 1) ? " count_size" : "");
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}
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/* Be sure it is enabled. */
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bus_write_4(sc->mem_res, HPET_OFFSET_ENABLE, 1);
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if (testenv("debug.acpi.hpet_test"))
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acpi_hpet_test(sc);
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hpet_timecounter.tc_frequency = freq;
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hpet_timecounter.tc_priv = sc;
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tc_init(&hpet_timecounter);
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return (0);
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}
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static int
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acpi_hpet_detach(device_t dev)
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{
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ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__);
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/* XXX Without a tc_remove() function, we can't detach. */
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return (EBUSY);
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}
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static int
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acpi_hpet_resume(device_t dev)
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{
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struct acpi_hpet_softc *sc;
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/* Re-enable the timer after a resume to keep the clock advancing. */
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sc = device_get_softc(dev);
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bus_write_4(sc->mem_res, HPET_OFFSET_ENABLE, 1);
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return (0);
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}
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/* Print some basic latency/rate information to assist in debugging. */
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static void
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acpi_hpet_test(struct acpi_hpet_softc *sc)
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{
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int i;
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uint32_t u1, u2;
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struct bintime b0, b1, b2;
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struct timespec ts;
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binuptime(&b0);
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binuptime(&b0);
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binuptime(&b1);
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u1 = bus_read_4(sc->mem_res, HPET_OFFSET_VALUE);
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for (i = 1; i < 1000; i++)
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u2 = bus_read_4(sc->mem_res, HPET_OFFSET_VALUE);
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binuptime(&b2);
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u2 = bus_read_4(sc->mem_res, HPET_OFFSET_VALUE);
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bintime_sub(&b2, &b1);
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bintime_sub(&b1, &b0);
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bintime_sub(&b2, &b1);
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bintime2timespec(&b2, &ts);
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device_printf(sc->dev, "%ld.%09ld: %u ... %u = %u\n",
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(long)ts.tv_sec, ts.tv_nsec, u1, u2, u2 - u1);
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device_printf(sc->dev, "time per call: %ld ns\n", ts.tv_nsec / 1000);
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}
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static device_method_t acpi_hpet_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, acpi_hpet_probe),
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DEVMETHOD(device_attach, acpi_hpet_attach),
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DEVMETHOD(device_detach, acpi_hpet_detach),
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DEVMETHOD(device_resume, acpi_hpet_resume),
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{0, 0}
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};
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static driver_t acpi_hpet_driver = {
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"acpi_hpet",
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acpi_hpet_methods,
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sizeof(struct acpi_hpet_softc),
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};
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DRIVER_MODULE(acpi_hpet, acpi, acpi_hpet_driver, acpi_hpet_devclass, 0, 0);
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MODULE_DEPEND(acpi_hpet, acpi, 1, 1, 1);
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