Initial stab at a driver for LOMlite2 as found on the Sun Fire V100, Sun Fire

V120 and Sun Netra X1.  For now this only provides a temperature sensor, but
more stuff will follow.

3 files changed, 173 insertions, 2 deletions

diff --git a/sys/arch/sparc64/conf/GENERIC b/sys/arch/sparc64/conf/GENERIC
index dfead45fc6d..d597bd042ee 100644
--- a/sys/arch/sparc64/conf/GENERIC
+++ b/sys/arch/sparc64/conf/GENERIC
@@ -1,4 +1,4 @@
-#	$OpenBSD: GENERIC,v 1.243 2009/09/01 19:15:42 kettenis Exp $
+#	$OpenBSD: GENERIC,v 1.244 2009/09/19 19:37:42 kettenis Exp $
 #
 # For further information on compiling OpenBSD kernels, see the config(8)
 # man page.
@@ -312,6 +312,7 @@ lpt*	at ebus?
 
 bbc*	at ebus?
 led*	at ebus?
+lom*	at ebus?
 pmc*	at ebus?
 ppm*	at ebus?
 
diff --git a/sys/arch/sparc64/conf/files.sparc64 b/sys/arch/sparc64/conf/files.sparc64
index ac70dfdf778..3ff06f05cc6 100644
--- a/sys/arch/sparc64/conf/files.sparc64
+++ b/sys/arch/sparc64/conf/files.sparc64
@@ -1,4 +1,4 @@
-#	$OpenBSD: files.sparc64,v 1.126 2009/07/05 17:13:25 kettenis Exp $
+#	$OpenBSD: files.sparc64,v 1.127 2009/09/19 19:37:42 kettenis Exp $
 #	$NetBSD: files.sparc64,v 1.50 2001/08/10 20:53:50 eeh Exp $
 
 # maxpartitions must be first item in files.${ARCH}
@@ -217,6 +217,10 @@ device	led
 attach	led at ebus
 file	arch/sparc64/dev/led.c			led
 
+device	lom
+attach	lom at ebus
+file	arch/sparc64/dev/lom.c			lom
+
 device	pmc
 attach	pmc at ebus
 file	arch/sparc64/dev/pmc.c			pmc
diff --git a/sys/arch/sparc64/dev/lom.c b/sys/arch/sparc64/dev/lom.c
new file mode 100644
index 00000000000..48a4c9e395e
--- /dev/null
+++ b/sys/arch/sparc64/dev/lom.c
@@ -0,0 +1,166 @@
+/*	$OpenBSD: lom.c,v 1.1 2009/09/19 19:37:42 kettenis Exp $	*/
+/*
+ * Copyright (c) 2008 Mark Kettenis
+ *
+ * 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/device.h>
+#include <sys/sensors.h>
+#include <sys/systm.h>
+
+#include <machine/autoconf.h>
+#include <machine/openfirm.h>
+
+#include <sparc64/dev/ebusreg.h>
+#include <sparc64/dev/ebusvar.h>
+
+/*
+ * The LOM is implemented as a H8/3437 microcontroller which has its
+ * on-chip host interface hooked up to EBus.
+ */
+#define LOM_DATA		0x00	/* R/W */
+#define LOM_CMD			0x01	/* W */
+#define LOM_STATUS		0x01	/* R */
+#define  LOM_STATUS_OBF		0x01	/* Output Buffer Full */
+#define  LOM_STATUS_IBF		0x02	/* Input Buffer Full  */
+
+#define LOM_IDX_FW_REV		0x01	/* Firmware revision  */
+
+#define LOM_IDX_TEMP1		0x18	/* Temperature */
+
+#define LOM_IDX_PROBE55		0x7e	/* Always returns 0x55 */
+#define LOM_IDX_PROBEAA		0x7f	/* Always returns 0xaa */
+
+struct lom_softc {
+	struct device		sc_dev;
+	bus_space_tag_t		sc_iot;
+	bus_space_handle_t	sc_ioh;
+
+	struct ksensor		sc_sensor;
+	struct ksensordev	sc_sensordev;
+};
+
+int	lom_match(struct device *, void *, void *);
+void	lom_attach(struct device *, struct device *, void *);
+
+struct cfattach lom_ca = {
+	sizeof(struct lom_softc), lom_match, lom_attach
+};
+
+struct cfdriver lom_cd = {
+	NULL, "lom", DV_DULL
+};
+
+int	lom_read(struct lom_softc *, uint8_t, uint8_t *);
+int	lom_write(struct lom_softc *, uint8_t, uint8_t);
+
+void	lom_refresh(void *);
+
+int
+lom_match(struct device *parent, void *match, void *aux)
+{
+	struct ebus_attach_args *ea = aux;
+
+	if (strcmp(ea->ea_name, "SUNW,lomh") == 0)
+		return (1);
+
+	return (0);
+}
+
+void
+lom_attach(struct device *parent, struct device *self, void *aux)
+{
+	struct lom_softc *sc = (void *)self;
+	struct ebus_attach_args *ea = aux;
+	uint8_t reg, fw_rev;
+
+	sc->sc_iot = ea->ea_memtag;
+	if (ebus_bus_map(ea->ea_memtag, 0,
+	    EBUS_PADDR_FROM_REG(&ea->ea_regs[0]),
+	    ea->ea_regs[0].size, 0, 0, &sc->sc_ioh)) {
+		printf(": can't map register space\n");
+                return;
+	}
+
+	if (lom_read(sc, LOM_IDX_PROBE55, &reg) || reg != 0x55 ||
+	    lom_read(sc, LOM_IDX_PROBEAA, &reg) || reg != 0xaa ||
+	    lom_read(sc, LOM_IDX_FW_REV, &fw_rev)) {
+		printf(": not responding\n");
+		return;
+	}
+
+	/* Initialize sensor data. */
+	strlcpy(sc->sc_sensordev.xname, sc->sc_dev.dv_xname,
+	    sizeof(sc->sc_sensordev.xname));
+	sc->sc_sensor.type = SENSOR_TEMP;
+
+	sensor_attach(&sc->sc_sensordev, &sc->sc_sensor);
+
+	if (sensor_task_register(sc, lom_refresh, 5) == NULL) {
+		printf(": unable to register update task\n");
+		return;
+	}
+
+	sensordev_install(&sc->sc_sensordev);
+
+	printf(": rev %d.%d\n", fw_rev >> 4, fw_rev & 0x0f);
+}
+
+int
+lom_read(struct lom_softc *sc, uint8_t reg, uint8_t *val)
+{
+	uint8_t str;
+	int i;
+
+	/* Wait for input buffer to become available. */
+	for (i = 1000; i > 0; i--) {
+		str = bus_space_read_1(sc->sc_iot, sc->sc_ioh, LOM_STATUS);
+		delay(10);
+		if ((str & LOM_STATUS_IBF) == 0)
+			break;
+	}
+	if (i == 0)
+		return (ETIMEDOUT);
+
+	bus_space_write_1(sc->sc_iot, sc->sc_ioh, LOM_CMD, reg);
+
+	/* Wait until the microcontroller fills output buffer. */
+	for (i = 1000; i > 0; i--) {
+		str = bus_space_read_1(sc->sc_iot, sc->sc_ioh, LOM_STATUS);
+		delay(10);
+		if (str & 0x01)
+			break;
+	}
+	if (i == 0)
+		return (ETIMEDOUT);
+
+	*val = bus_space_read_1(sc->sc_iot, sc->sc_ioh, LOM_DATA);
+	return (0);
+}
+
+void
+lom_refresh(void *arg)
+{
+	struct lom_softc *sc = arg;
+	uint8_t val;
+
+	if (lom_read(sc, LOM_IDX_TEMP1, &val)) {
+		sc->sc_sensor.flags |= SENSOR_FINVALID;
+		return;
+	}
+
+	sc->sc_sensor.value = val * 1000000 + 273150000;
+	sc->sc_sensor.flags &= ~SENSOR_FINVALID;
+}