Add a basic HPET timecounter.

It has -200 quality for now so it will not get automatically selected.

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);