add power(4), a driver for the power button found on SGI O2's.

when machdep.kbdreset is set, and the correct interrupt is fired,
the machine gets shut down.

with help from and ok jsing@, ok miod@

1 files changed, 142 insertions, 0 deletions

diff --git a/sys/arch/sgi/dev/power.c b/sys/arch/sgi/dev/power.c
new file mode 100644
index 00000000000..cabfd435a4f
--- /dev/null
+++ b/sys/arch/sgi/dev/power.c
@@ -0,0 +1,142 @@
+/*	$OpenBSD: power.c,v 1.1 2007/12/18 08:29:02 jasper Exp $	*/
+
+/*
+ * Copyright (c) 2007 Jasper Lievisse Adriaanse <jasper@openbsd.org>
+ *
+ * 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/types.h>
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/device.h>
+#include <sys/conf.h>
+#include <sys/proc.h>
+#include <sys/signalvar.h>
+
+#include <machine/bus.h>
+#include <machine/autoconf.h>
+
+#include <mips64/archtype.h>
+#include <mips64/dev/clockvar.h>
+
+#include <sgi/localbus/crimebus.h>
+#include <sgi/localbus/macebus.h>
+
+/*
+ * Powerbutton driver for the SGI O2
+ */
+
+#define	DS1687_EXT_CTRL		0x4a
+#define	DS1687_KICKSTART	0x01
+
+struct power_softc {
+	struct device		sc_dev;
+	bus_space_tag_t		sc_st;
+	bus_space_handle_t	sc_sh;
+	bus_space_handle_t	sc_isash;
+};
+
+int	power_match(struct device *, void *, void *);
+void	power_attach(struct device *, struct device *, void *);
+int	power_intr(void *aux);
+
+struct cfattach power_ca = {
+	sizeof(struct power_softc),
+	power_match,
+	power_attach
+};
+
+struct cfdriver power_cd = {
+	NULL, "power", DV_DULL
+};
+
+int
+power_match(struct device *parent, void *match, void *aux)
+{
+	struct confargs *ca = aux;
+
+	/* Powerbutton only on SGI_O2, for now that is */
+	if (ca->ca_sys == SGI_O2)
+		return (1);
+
+	return (0);
+}
+
+void
+power_attach(struct device *parent, struct device *self, void *aux)
+{
+	struct power_softc *sc = (void *)self;
+	struct confargs *ca = aux;
+	int sc_irq;
+	void *rv = NULL;
+
+	printf(": ");
+
+	sc->sc_st = ca->ca_iot;
+	sc_irq = ca->ca_intr;
+
+	/* Map subregion to clock address space. */
+	extern bus_space_handle_t clock_h;
+	if (bus_space_subregion(sc->sc_st, clock_h, 0, 0x50, &sc->sc_sh)) {
+		printf("failed to map clock address space!\n");
+		return;
+	}
+
+	/* Map subregion to ISA control registers. */
+	extern bus_space_handle_t mace_h;
+	if (bus_space_subregion(sc->sc_st, mace_h, 0, 0x80, &sc->sc_isash)) {
+		printf("failed to map ISA control registers!\n");
+		return;
+	}
+ 	
+	/* Establish the interrupt. */
+	rv = macebus_intr_establish(NULL, sc_irq, IST_EDGE, IPL_TTY, power_intr,
+	    sc, sc->sc_dev.dv_xname);
+	if (rv == NULL)
+		printf("unable to establish interrupt\n");
+	else
+		printf("using irq %d\n", sc_irq);
+}
+
+int
+power_intr(void *arg)
+{
+	struct power_softc *sc = (void *)arg;
+	u_int64_t val;
+	extern int kbd_reset;
+
+	/* Check to see if this interrupt is for us. */
+	val = bus_space_read_8(sc->sc_st, sc->sc_isash, MACE_ISA_INT_STAT);
+	if (val & MACE_ISA_INT_RTC) {
+
+		/* 
+		 * Prevent further interrupts by clearing the kickstart flag
+		 * in the DS1687's extended control register.
+		 */
+		val = bus_space_read_1(sc->sc_st, sc->sc_sh, DS1687_EXT_CTRL);
+		bus_space_write_1(sc->sc_st, sc->sc_sh, DS1687_EXT_CTRL,
+		    val & ~DS1687_KICKSTART);
+
+		if (kbd_reset == 1) {
+			kbd_reset = 0;
+			psignal(initproc, SIGUSR2);
+		}
+
+		return(1);
+	}
+
+	return(0);
+}
+