Start on a basic ACPI framework -- does not do much more than read out the

ACPI tables into kernel memory and attach ACPI and HPET timers currently.

In order to test this code, enabling the devices in GENERIC as well as
the ACPI_ENABLE option is needed.  This code does not do any thermal
control yet, so this should be done with care depending on the platform.

In the tree so more people can contribute to making this more fully
featured.

Ok niklas@ grange@ tedu@

1 files changed, 144 insertions, 0 deletions

diff --git a/sys/dev/acpi/hpet.c b/sys/dev/acpi/hpet.c
new file mode 100644
index 00000000000..e79e7a42627
--- /dev/null
+++ b/sys/dev/acpi/hpet.c
@@ -0,0 +1,144 @@
+/*	$OpenBSD: hpet.c,v 1.1 2005/06/02 20:09:39 tholo Exp $	*/
+/*
+ * Copyright (c) 2005 Thorsten Lockert <tholo@sigmasoft.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/device.h>
+#include <sys/malloc.h>
+#ifdef __HAVE_TIMECOUNTER
+#include <sys/timetc.h>
+#endif
+
+#include <machine/bus.h>
+
+#include <dev/acpi/acpireg.h>
+#include <dev/acpi/acpivar.h>
+#include <dev/acpi/hpetreg.h>
+
+int hpetmatch(struct device *, void *, void *);
+void hpetattach(struct device *, struct device *, void *);
+
+#ifdef __HAVE_TIMECOUNTER
+u_int hpet_get_timecount(struct timecounter *tc);
+
+static struct timecounter hpet_timecounter = {
+	hpet_get_timecount,	/* get_timecount */
+	0,			/* no poll_pps */
+	0xffffffff,		/* counter_mask (24 bits) */
+	0,			/* frequency */
+	0,			/* name */
+	1000			/* quality */
+};
+#endif
+
+struct hpet_softc {
+	struct device		sc_dev;
+
+	bus_space_tag_t		sc_iot;
+	bus_space_handle_t	sc_ioh;
+};
+
+struct cfattach hpet_ca = {
+	sizeof(struct hpet_softc), hpetmatch, hpetattach
+};
+
+struct cfdriver hpet_cd = {
+	NULL, "hpet", DV_DULL
+};
+
+int
+hpetmatch(struct device *parent, void *match, void *aux)
+{
+	struct acpi_attach_args *aaa = aux;
+	struct acpi_table_header *hdr;
+
+	/*
+	 * If we do not have a table, it is not us
+	 */
+	if (aaa->aaa_table == NULL)
+		return (0);
+
+	/*
+	 * If it is an HPET table, we can attach
+	 */
+	hdr = (struct acpi_table_header *)aaa->aaa_table;
+	if (memcmp(hdr->signature, HPET_SIG, sizeof(HPET_SIG) - 1) != 0)
+		return (0);
+
+	return (1);
+}
+
+void
+hpetattach(struct device *parent, struct device *self, void *aux)
+{
+	struct hpet_softc *sc = (struct hpet_softc *) self;
+	struct acpi_attach_args *aa = aux;
+	struct acpi_hpet *hpet = (struct acpi_hpet *)aa->aaa_table;
+	u_int64_t period, freq;	/* timer period in femtoseconds (10^-15) */
+
+	switch (hpet->base_address.address_space_id) {
+	case GAS_SYSTEM_MEMORY:
+		sc->sc_iot = aa->aaa_memt;
+		break;
+
+	case GAS_SYSTEM_IOSPACE:
+		sc->sc_iot = aa->aaa_iot;
+		break;
+
+#if 0
+	case GAS_SYSTEM_PCI_CFG_SPACE:
+		sc->sc_iot = aa->aaa_pcit;
+		break;
+
+	case GAS_SYSTEM_SMBUS:
+		sc->sc_iot = aa->aaa_smbust;
+		break;
+#endif
+
+	default:
+		printf(": can't identify bus\n");
+		return;
+	}
+
+        if (bus_space_map(sc->sc_iot, hpet->base_address.address, HPET_REG_SIZE,
+	    0, &sc->sc_ioh)) {
+                printf(": can't map i/o space\n");
+                return;
+        }
+
+	period = bus_space_read_4(sc->sc_iot, sc->sc_ioh,
+				  HPET_CAPABILITIES + sizeof(u_int32_t));
+	freq =  1000000000000000ull / period;
+	printf(": %lld Hz\n", freq);
+
+#ifdef __HAVE_TIMECOUNTER
+	hpet_timecounter.tc_frequency = (u_int32_t)freq;
+	hpet_timecounter.tc_priv = sc;
+	hpet_timecounter.tc_name = sc->sc_dev.dv_xname;
+	tc_init(&hpet_timecounter);
+#endif
+}
+
+#ifdef __HAVE_TIMECOUNTER
+u_int
+hpet_get_timecount(struct timecounter *tc)
+{
+	struct hpet_softc *sc = tc->tc_priv;
+
+	return (bus_space_read_4(sc->sc_iot, sc->sc_ioh, HPET_MAIN_COUNTER));
+}
+#endif