Add mvtemp(4), a driver for the temperature sensors found on Marvell Armada

SoCs.

2 files changed, 204 insertions, 1 deletions

diff --git a/sys/dev/fdt/files.fdt b/sys/dev/fdt/files.fdt
index 08e3b2b283c..b0bffd965bd 100644
--- a/sys/dev/fdt/files.fdt
+++ b/sys/dev/fdt/files.fdt
@@ -1,4 +1,4 @@
-#	$OpenBSD: files.fdt,v 1.51 2018/03/30 20:38:27 patrick Exp $
+#	$OpenBSD: files.fdt,v 1.52 2018/03/31 16:35:15 kettenis Exp $
 #
 # Config file and device description for machine-independent FDT code.
 # Included by ports that need it.
@@ -174,6 +174,10 @@ device	mvrtc
 attach	mvrtc at fdt
 file	dev/fdt/mvrtc.c			mvrtc
 
+device	mvtemp
+attach	mvtemp at fdt
+file	dev/fdt/mvtemp.c		mvtemp
+
 device	dwxe: ether, ifnet, mii, ifmedia
 attach	dwxe at fdt
 file	dev/fdt/if_dwxe.c		dwxe
diff --git a/sys/dev/fdt/mvtemp.c b/sys/dev/fdt/mvtemp.c
new file mode 100644
index 00000000000..d6112f71d03
--- /dev/null
+++ b/sys/dev/fdt/mvtemp.c
@@ -0,0 +1,199 @@
+/*	$OpenBSD: mvtemp.c,v 1.1 2018/03/31 16:35:15 kettenis Exp $	*/
+/*
+ * Copyright (c) 2018 Mark Kettenis <kettenis@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/param.h>
+#include <sys/systm.h>
+#include <sys/device.h>
+#include <sys/sensors.h>
+
+#include <machine/bus.h>
+#include <machine/fdt.h>
+
+#include <dev/ofw/openfirm.h>
+#include <dev/ofw/fdt.h>
+
+/* Registers */
+#define TEMP_STAT			0x0000
+#define TEMP_CTRL0			0x0000
+#define  TEMP_CTRL0_TSEN_TC_TRIM_MASK	0x7
+#define  TEMP_CTRL0_TSEN_TC_TRIM_VAL	0x3
+#define TEMP_CTRL1			0x0004
+#define  TEMP_CTRL1_TSEN_RESET		(1 << 8)
+
+struct mvtemp_softc {
+	struct device		sc_dev;
+	bus_space_tag_t		sc_iot;
+	bus_space_handle_t	sc_stat_ioh;
+	bus_space_handle_t	sc_ctrl_ioh;
+
+	uint32_t		sc_stat_valid;
+	int32_t			(*sc_calc_temp)(uint32_t);
+
+	struct ksensor		sc_sensor;
+	struct ksensordev	sc_sensordev;
+};
+
+int	mvtemp_match(struct device *, void *, void *);
+void	mvtemp_attach(struct device *, struct device *, void *);
+
+struct cfattach	mvtemp_ca = {
+	sizeof (struct mvtemp_softc), mvtemp_match, mvtemp_attach
+};
+
+struct cfdriver mvtemp_cd = {
+	NULL, "mvtemp", DV_DULL
+};
+
+struct mvtemp_compat {
+	const char *compat;
+	uint32_t stat_valid;
+	void	(*init)(struct mvtemp_softc *);
+	int32_t	(*calc_temp)(uint32_t);
+};
+
+void	mvtemp_ap806_init(struct mvtemp_softc *);
+int32_t mvtemp_ap806_calc_temp(uint32_t);
+void	mvtemp_cp110_init(struct mvtemp_softc *);
+int32_t mvtemp_cp110_calc_temp(uint32_t);
+
+struct mvtemp_compat mvtemp_compat[] = {
+	{
+		"marvell,armada-ap806-thermal", (1 << 16),
+		mvtemp_ap806_init, mvtemp_ap806_calc_temp,
+	},
+	{
+		"marvell,armada-cp110-thermal", (1 << 10),
+		mvtemp_cp110_init, mvtemp_cp110_calc_temp,
+	}
+};
+
+void	mvtemp_refresh_sensors(void *);
+
+int
+mvtemp_match(struct device *parent, void *match, void *aux)
+{
+	struct fdt_attach_args *faa = aux;
+	int i;
+
+	for (i = 0; i < nitems(mvtemp_compat); i++) {
+		if (OF_is_compatible(faa->fa_node, mvtemp_compat[i].compat))
+			return 1;
+	}
+
+	return 0;
+}
+
+void
+mvtemp_attach(struct device *parent, struct device *self, void *aux)
+{
+	struct mvtemp_softc *sc = (struct mvtemp_softc *)self;
+	struct fdt_attach_args *faa = aux;
+	int i;
+
+	if (faa->fa_nreg < 2) {
+		printf(": no registers\n");
+		return;
+	}
+
+	sc->sc_iot = faa->fa_iot;
+	if (bus_space_map(sc->sc_iot, faa->fa_reg[0].addr,
+	    faa->fa_reg[0].size, 0, &sc->sc_stat_ioh)) {
+		printf(": can't map registers\n");
+		return;
+	}
+	if (bus_space_map(sc->sc_iot, faa->fa_reg[1].addr,
+	    faa->fa_reg[1].size, 0, &sc->sc_ctrl_ioh)) {
+		bus_space_unmap(sc->sc_iot, sc->sc_stat_ioh,
+		    faa->fa_reg[0].size);
+		printf(": can't map registers\n");
+		return;
+	}
+
+	printf("\n");
+
+	for (i = 0; i < nitems(mvtemp_compat); i++) {
+		if (OF_is_compatible(faa->fa_node, mvtemp_compat[i].compat)) {
+			break;
+		}
+	}
+	KASSERT(i < nitems(mvtemp_compat));
+
+	mvtemp_compat[i].init(sc);
+	sc->sc_stat_valid = mvtemp_compat[i].stat_valid;
+	sc->sc_calc_temp = mvtemp_compat[i].calc_temp;
+
+	/* Register sensors. */
+	strlcpy(sc->sc_sensordev.xname, sc->sc_dev.dv_xname,
+	    sizeof(sc->sc_sensordev.xname));
+	sc->sc_sensor.type = SENSOR_TEMP;
+	sc->sc_sensor.flags = SENSOR_FINVALID;
+	sensor_attach(&sc->sc_sensordev, &sc->sc_sensor);
+	sensordev_install(&sc->sc_sensordev);
+	sensor_task_register(sc, mvtemp_refresh_sensors, 5);
+}
+
+/* AP806 */
+
+void
+mvtemp_ap806_init(struct mvtemp_softc *sc)
+{
+}
+
+int32_t
+mvtemp_ap806_calc_temp(uint32_t stat)
+{
+	stat = ((stat & 0x3ff) ^ 0x200) - 0x200;
+	return (stat * 423000) + 150000000 + 273150000;
+}
+
+/* CP110 */
+
+void
+mvtemp_cp110_init(struct mvtemp_softc *sc)
+{
+	uint32_t ctrl;
+
+	ctrl = bus_space_read_4(sc->sc_iot, sc->sc_ctrl_ioh, TEMP_CTRL1);
+	ctrl |= TEMP_CTRL1_TSEN_RESET;
+	bus_space_write_4(sc->sc_iot, sc->sc_ctrl_ioh, TEMP_CTRL1, ctrl);
+
+	ctrl = bus_space_read_4(sc->sc_iot, sc->sc_ctrl_ioh, TEMP_CTRL0);
+	ctrl &= ~TEMP_CTRL0_TSEN_TC_TRIM_MASK;
+	ctrl |= TEMP_CTRL0_TSEN_TC_TRIM_VAL;
+	bus_space_write_4(sc->sc_iot, sc->sc_ctrl_ioh, TEMP_CTRL0, ctrl);
+}
+
+int32_t
+mvtemp_cp110_calc_temp(uint32_t stat)
+{
+	return ((stat & 0x3ff) * 476100) - 279100000 + 273150000;
+}
+
+void
+mvtemp_refresh_sensors(void *arg)
+{
+	struct mvtemp_softc *sc = arg;
+	int32_t stat, temp;
+
+	stat = bus_space_read_4(sc->sc_iot, sc->sc_stat_ioh, TEMP_STAT);
+	temp = sc->sc_calc_temp(stat);
+	sc->sc_sensor.value = temp;
+	if ((stat & sc->sc_stat_valid) && temp >= 0)
+		sc->sc_sensor.flags &= ~SENSOR_FINVALID;
+	else
+		sc->sc_sensor.flags |= SENSOR_FINVALID;
+}