318 lines
8.1 KiB
C
318 lines
8.1 KiB
C
/*-
|
|
* 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/bus.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/module.h>
|
|
#include <sys/rman.h>
|
|
#include <sys/time.h>
|
|
#include <sys/timetc.h>
|
|
|
|
#include <contrib/dev/acpica/acpi.h>
|
|
#include <dev/acpica/acpivar.h>
|
|
#include <dev/acpica/acpi_hpet.h>
|
|
|
|
ACPI_SERIAL_DECL(hpet, "ACPI HPET support");
|
|
|
|
static devclass_t acpi_hpet_devclass;
|
|
|
|
/* ACPI CA debugging */
|
|
#define _COMPONENT ACPI_TIMER
|
|
ACPI_MODULE_NAME("HPET")
|
|
|
|
struct acpi_hpet_softc {
|
|
device_t dev;
|
|
struct resource *mem_res;
|
|
ACPI_HANDLE handle;
|
|
};
|
|
|
|
static u_int hpet_get_timecount(struct timecounter *tc);
|
|
static void acpi_hpet_test(struct acpi_hpet_softc *sc);
|
|
|
|
static char *hpet_ids[] = { "PNP0103", NULL };
|
|
|
|
#define DEV_HPET(x) (acpi_get_magic(x) == (uintptr_t)&acpi_hpet_devclass)
|
|
|
|
struct timecounter hpet_timecounter = {
|
|
.tc_get_timecount = hpet_get_timecount,
|
|
.tc_counter_mask = ~0u,
|
|
.tc_name = "HPET",
|
|
.tc_quality = 900,
|
|
};
|
|
|
|
static u_int
|
|
hpet_get_timecount(struct timecounter *tc)
|
|
{
|
|
struct acpi_hpet_softc *sc;
|
|
|
|
sc = tc->tc_priv;
|
|
return (bus_read_4(sc->mem_res, HPET_MAIN_COUNTER));
|
|
}
|
|
|
|
static void
|
|
hpet_enable(struct acpi_hpet_softc *sc)
|
|
{
|
|
uint32_t val;
|
|
|
|
val = bus_read_4(sc->mem_res, HPET_CONFIG);
|
|
val &= ~HPET_CNF_LEG_RT;
|
|
val |= HPET_CNF_ENABLE;
|
|
bus_write_4(sc->mem_res, HPET_CONFIG, val);
|
|
}
|
|
|
|
static void
|
|
hpet_disable(struct acpi_hpet_softc *sc)
|
|
{
|
|
uint32_t val;
|
|
|
|
val = bus_read_4(sc->mem_res, HPET_CONFIG);
|
|
val &= ~HPET_CNF_ENABLE;
|
|
bus_write_4(sc->mem_res, HPET_CONFIG, val);
|
|
}
|
|
|
|
/* Discover the HPET via the ACPI table of the same name. */
|
|
static void
|
|
acpi_hpet_identify(driver_t *driver, device_t parent)
|
|
{
|
|
ACPI_TABLE_HPET *hpet;
|
|
ACPI_TABLE_HEADER *hdr;
|
|
ACPI_STATUS status;
|
|
device_t child;
|
|
|
|
/* Only one HPET device can be added. */
|
|
if (devclass_get_device(acpi_hpet_devclass, 0))
|
|
return;
|
|
|
|
/* Currently, ID and minimum clock tick info is unused. */
|
|
|
|
status = AcpiGetTable(ACPI_SIG_HPET, 1, (ACPI_TABLE_HEADER **)&hdr);
|
|
if (ACPI_FAILURE(status))
|
|
return;
|
|
|
|
/*
|
|
* The unit number could be derived from hdr->Sequence but we only
|
|
* support one HPET device.
|
|
*/
|
|
hpet = (ACPI_TABLE_HPET *)hdr;
|
|
if (hpet->Sequence != 0)
|
|
printf("ACPI HPET table warning: Sequence is non-zero (%d)\n",
|
|
hpet->Sequence);
|
|
child = BUS_ADD_CHILD(parent, ACPI_DEV_BASE_ORDER, "acpi_hpet", 0);
|
|
if (child == NULL) {
|
|
printf("%s: can't add child\n", __func__);
|
|
return;
|
|
}
|
|
|
|
/* Record a magic value so we can detect this device later. */
|
|
acpi_set_magic(child, (uintptr_t)&acpi_hpet_devclass);
|
|
bus_set_resource(child, SYS_RES_MEMORY, 0, hpet->Address.Address,
|
|
HPET_MEM_WIDTH);
|
|
}
|
|
|
|
static int
|
|
acpi_hpet_probe(device_t dev)
|
|
{
|
|
ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__);
|
|
|
|
if (acpi_disabled("hpet"))
|
|
return (ENXIO);
|
|
if (!DEV_HPET(dev) &&
|
|
(ACPI_ID_PROBE(device_get_parent(dev), dev, hpet_ids) == NULL ||
|
|
device_get_unit(dev) != 0))
|
|
return (ENXIO);
|
|
|
|
device_set_desc(dev, "High Precision Event Timer");
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
acpi_hpet_attach(device_t dev)
|
|
{
|
|
struct acpi_hpet_softc *sc;
|
|
int rid;
|
|
uint32_t val, val2;
|
|
uintmax_t freq;
|
|
|
|
ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__);
|
|
|
|
sc = device_get_softc(dev);
|
|
sc->dev = dev;
|
|
sc->handle = acpi_get_handle(dev);
|
|
|
|
rid = 0;
|
|
sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
|
|
RF_ACTIVE);
|
|
if (sc->mem_res == NULL)
|
|
return (ENOMEM);
|
|
|
|
/* Validate that we can access the whole region. */
|
|
if (rman_get_size(sc->mem_res) < HPET_MEM_WIDTH) {
|
|
device_printf(dev, "memory region width %ld too small\n",
|
|
rman_get_size(sc->mem_res));
|
|
bus_free_resource(dev, SYS_RES_MEMORY, sc->mem_res);
|
|
return (ENXIO);
|
|
}
|
|
|
|
/* Be sure timer is enabled. */
|
|
hpet_enable(sc);
|
|
|
|
/* Read basic statistics about the timer. */
|
|
val = bus_read_4(sc->mem_res, HPET_PERIOD);
|
|
if (val == 0) {
|
|
device_printf(dev, "invalid period\n");
|
|
hpet_disable(sc);
|
|
bus_free_resource(dev, SYS_RES_MEMORY, sc->mem_res);
|
|
return (ENXIO);
|
|
}
|
|
|
|
freq = (1000000000000000LL + val / 2) / val;
|
|
if (bootverbose) {
|
|
val = bus_read_4(sc->mem_res, HPET_CAPABILITIES);
|
|
device_printf(dev,
|
|
"vend: 0x%x rev: 0x%x num: %d hz: %jd opts:%s%s\n",
|
|
val >> 16, val & HPET_CAP_REV_ID,
|
|
(val & HPET_CAP_NUM_TIM) >> 8, freq,
|
|
(val & HPET_CAP_LEG_RT) ? " legacy_route" : "",
|
|
(val & HPET_CAP_COUNT_SIZE) ? " 64-bit" : "");
|
|
}
|
|
|
|
if (testenv("debug.acpi.hpet_test"))
|
|
acpi_hpet_test(sc);
|
|
|
|
/*
|
|
* Don't attach if the timer never increments. Since the spec
|
|
* requires it to be at least 10 MHz, it has to change in 1 us.
|
|
*/
|
|
val = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER);
|
|
DELAY(1);
|
|
val2 = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER);
|
|
if (val == val2) {
|
|
device_printf(dev, "HPET never increments, disabling\n");
|
|
hpet_disable(sc);
|
|
bus_free_resource(dev, SYS_RES_MEMORY, sc->mem_res);
|
|
return (ENXIO);
|
|
}
|
|
|
|
hpet_timecounter.tc_frequency = freq;
|
|
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__);
|
|
|
|
/* XXX Without a tc_remove() function, we can't detach. */
|
|
return (EBUSY);
|
|
}
|
|
|
|
static int
|
|
acpi_hpet_suspend(device_t dev)
|
|
{
|
|
struct acpi_hpet_softc *sc;
|
|
|
|
/*
|
|
* Disable the timer during suspend. The timer will not lose
|
|
* its state in S1 or S2, but we are required to disable
|
|
* it.
|
|
*/
|
|
sc = device_get_softc(dev);
|
|
hpet_disable(sc);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
acpi_hpet_resume(device_t dev)
|
|
{
|
|
struct acpi_hpet_softc *sc;
|
|
|
|
/* Re-enable the timer after a resume to keep the clock advancing. */
|
|
sc = device_get_softc(dev);
|
|
hpet_enable(sc);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/* Print some basic latency/rate information to assist in debugging. */
|
|
static void
|
|
acpi_hpet_test(struct acpi_hpet_softc *sc)
|
|
{
|
|
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->mem_res, HPET_MAIN_COUNTER);
|
|
for (i = 1; i < 1000; i++)
|
|
u2 = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER);
|
|
binuptime(&b2);
|
|
u2 = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER);
|
|
|
|
bintime_sub(&b2, &b1);
|
|
bintime_sub(&b1, &b0);
|
|
bintime_sub(&b2, &b1);
|
|
bintime2timespec(&b2, &ts);
|
|
|
|
device_printf(sc->dev, "%ld.%09ld: %u ... %u = %u\n",
|
|
(long)ts.tv_sec, ts.tv_nsec, u1, u2, u2 - u1);
|
|
|
|
device_printf(sc->dev, "time per call: %ld ns\n", ts.tv_nsec / 1000);
|
|
}
|
|
|
|
static device_method_t acpi_hpet_methods[] = {
|
|
/* Device interface */
|
|
DEVMETHOD(device_identify, acpi_hpet_identify),
|
|
DEVMETHOD(device_probe, acpi_hpet_probe),
|
|
DEVMETHOD(device_attach, acpi_hpet_attach),
|
|
DEVMETHOD(device_detach, acpi_hpet_detach),
|
|
DEVMETHOD(device_suspend, acpi_hpet_suspend),
|
|
DEVMETHOD(device_resume, acpi_hpet_resume),
|
|
|
|
{0, 0}
|
|
};
|
|
|
|
static driver_t acpi_hpet_driver = {
|
|
"acpi_hpet",
|
|
acpi_hpet_methods,
|
|
sizeof(struct acpi_hpet_softc),
|
|
};
|
|
|
|
|
|
DRIVER_MODULE(acpi_hpet, acpi, acpi_hpet_driver, acpi_hpet_devclass, 0, 0);
|
|
MODULE_DEPEND(acpi_hpet, acpi, 1, 1, 1);
|