Add Timer device driver for power management events.

The code for suspend/resume is derived from APM device driver.

Some people suggested the original code is somewhat buggy, but I'd
like to just move it from apm.c without any major changes for the
initial version.  This code should be refined later.

To use pmtimer to adjust time at resume time, add
	device	pmtimer
in your kernel config file, and add
	hint.pmtimer.0.at="isa"
in your device.hints

Reviewed by:	-current, bde

1 files changed, 139 insertions, 0 deletions

diff --git a/sys/i386/isa/pmtimer.c b/sys/i386/isa/pmtimer.c
new file mode 100644
index 0000000..732f8c7
--- /dev/null
+++ b/sys/i386/isa/pmtimer.c
@@ -0,0 +1,139 @@
+/*-
+ * Copyright (c) 2000 Mitsuru IWASAKI <iwasaki@FreeBSD.org>
+ * 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.
+ *
+ *	$FreeBSD$
+ */
+
+/*
+ * Timer device driver for power management events.
+ * The code for suspend/resume is derived from APM device driver.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/bus.h>
+#include <sys/kernel.h>
+#include <sys/syslog.h>
+#include <machine/clock.h>
+
+#include <isa/isavar.h>
+
+/* reject any PnP devices for now */
+static struct isa_pnp_id pmtimer_ids[] = {
+	{0}
+};
+
+static int
+pmtimer_probe(device_t dev)
+{
+
+	if (ISA_PNP_PROBE(device_get_parent(dev), dev, pmtimer_ids) == ENXIO) {
+		return (ENXIO);
+	}
+
+	/* only one instance always */
+	return (device_get_unit(dev));
+}
+
+static struct timeval suspend_time;
+static struct timeval diff_time;
+
+static int
+pmtimer_suspend(device_t dev)
+{
+	int	pl;
+
+	pl = splsoftclock();
+	microtime(&diff_time);
+	inittodr(0);
+	microtime(&suspend_time);
+	timevalsub(&diff_time, &suspend_time);
+	splx(pl);
+	return (0);
+}
+
+static int
+pmtimer_resume(device_t dev)
+{
+	int pl;
+	u_int second, minute, hour;
+	struct timeval resume_time, tmp_time;
+
+	/* modified for adjkerntz */
+	pl = splsoftclock();
+	i8254_restore();		/* restore timer_freq and hz */
+	inittodr(0);			/* adjust time to RTC */
+	microtime(&resume_time);
+	getmicrotime(&tmp_time);
+	timevaladd(&tmp_time, &diff_time);
+
+#ifdef FIXME
+	/* XXX THIS DOESN'T WORK!!! */
+	time = tmp_time;
+#endif
+
+#ifdef PMTIMER_FIXUP_CALLTODO
+	/* Calculate the delta time suspended */
+	timevalsub(&resume_time, &suspend_time);
+	/* Fixup the calltodo list with the delta time. */
+	adjust_timeout_calltodo(&resume_time);
+#endif /* PMTIMER_FIXUP_CALLTODOK */
+	splx(pl);
+#ifndef PMTIMER_FIXUP_CALLTODO
+	second = resume_time.tv_sec - suspend_time.tv_sec; 
+#else /* PMTIMER_FIXUP_CALLTODO */
+	/* 
+	 * We've already calculated resume_time to be the delta between 
+	 * the suspend and the resume. 
+	 */
+	second = resume_time.tv_sec; 
+#endif /* PMTIMER_FIXUP_CALLTODO */
+	hour = second / 3600;
+	second %= 3600;
+	minute = second / 60;
+	second %= 60;
+	log(LOG_NOTICE, "wakeup from sleeping state (slept %02d:%02d:%02d)\n",
+		hour, minute, second);
+	return (0);
+}
+
+static device_method_t pmtimer_methods[] = {
+	/* Device interface */
+	DEVMETHOD(device_probe,		pmtimer_probe),
+	DEVMETHOD(device_attach,	bus_generic_attach),
+	DEVMETHOD(device_suspend,	pmtimer_suspend),
+	DEVMETHOD(device_resume,	pmtimer_resume),
+	{ 0, 0 }
+};
+
+static driver_t pmtimer_driver = {
+	"pmtimer",
+	pmtimer_methods,
+	1,		/* no softc */
+};
+
+static devclass_t pmtimer_devclass;
+
+DRIVER_MODULE(pmtimer, isa, pmtimer_driver, pmtimer_devclass, 0, 0);