Add sxitemp(4), a driver for the temperature sensors on the Allwinner H5 SoC.

2 files changed, 167 insertions, 1 deletions

diff --git a/sys/dev/fdt/files.fdt b/sys/dev/fdt/files.fdt
index 5abe2d9c020..ece9a897294 100644
--- a/sys/dev/fdt/files.fdt
+++ b/sys/dev/fdt/files.fdt
@@ -1,4 +1,4 @@
-#	$OpenBSD: files.fdt,v 1.33 2017/12/31 11:13:59 kettenis Exp $
+#	$OpenBSD: files.fdt,v 1.34 2017/12/31 13:54:09 kettenis Exp $
 #
 # Config file and device description for machine-independent FDT code.
 # Included by ports that need it.
@@ -28,6 +28,10 @@ device	sximmc: sdmmcbus
 attach	sximmc at fdt
 file	dev/fdt/sximmc.c		sximmc
 
+device	sxitemp
+attach	sxitemp at fdt
+file	dev/fdt/sxitemp.c		sxitemp
+
 device	sxitwi: i2cbus
 attach	sxitwi at fdt
 file	dev/fdt/sxitwi.c		sxitwi
diff --git a/sys/dev/fdt/sxitemp.c b/sys/dev/fdt/sxitemp.c
new file mode 100644
index 00000000000..62fbf8643f9
--- /dev/null
+++ b/sys/dev/fdt/sxitemp.c
@@ -0,0 +1,162 @@
+/*	$OpenBSD: sxitemp.c,v 1.1 2017/12/31 13:54:09 kettenis Exp $	*/
+/*
+ * Copyright (c) 2017 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/intr.h>
+#include <machine/bus.h>
+#include <machine/fdt.h>
+
+#include <dev/ofw/openfirm.h>
+#include <dev/ofw/ofw_clock.h>
+#include <dev/ofw/ofw_misc.h>
+#include <dev/ofw/ofw_pinctrl.h>
+#include <dev/ofw/fdt.h>
+
+/* Registers */
+#define THS_CTRL0			0x0000
+#define  THS_CTRL0_SENSOR_ACQ(x)	((x) & 0xffff)
+#define THS_CTRL2			0x0040
+#define  THS_CTRL2_ADC_ACQ(x)		(((x) & 0xffff) << 16)
+#define  THS_CTRL2_SENSE1_EN		(1 << 1)
+#define  THS_CTRL2_SENSE0_EN		(1 << 0)
+#define THS_INT_CTRL			0x0044
+#define  THS_INT_CTRL_THERMAL_PER(x)	(((x) & 0xfffff) << 12)
+#define THS_FILTER			0x0070
+#define  THS_FILTER_EN			(1 << 2)
+#define  THS_FILTER_TYPE(x)		((x) & 0x3) 
+#define THS0_DATA			0x0080
+#define THS1_DATA			0x0084
+
+#define HREAD4(sc, reg)							\
+	(bus_space_read_4((sc)->sc_iot, (sc)->sc_ioh, (reg)))
+#define HWRITE4(sc, reg, val)						\
+	bus_space_write_4((sc)->sc_iot, (sc)->sc_ioh, (reg), (val))
+
+struct sxitemp_softc {
+	struct device		sc_dev;
+	bus_space_tag_t		sc_iot;
+	bus_space_handle_t	sc_ioh;
+
+	struct ksensor		sc_sensors[2];
+	struct ksensordev	sc_sensordev;
+};
+
+int	sxitemp_match(struct device *, void *, void *);
+void	sxitemp_attach(struct device *, struct device *, void *);
+
+struct cfattach	sxitemp_ca = {
+	sizeof (struct sxitemp_softc), sxitemp_match, sxitemp_attach
+};
+
+struct cfdriver sxitemp_cd = {
+	NULL, "sxitemp", DV_DULL
+};
+
+void	sxitemp_refresh_sensors(void *);
+
+int
+sxitemp_match(struct device *parent, void *match, void *aux)
+{
+	struct fdt_attach_args *faa = aux;
+
+	return (OF_is_compatible(faa->fa_node, "allwinner,sun50i-h5-ths"));
+}
+
+void
+sxitemp_attach(struct device *parent, struct device *self, void *aux)
+{
+	struct sxitemp_softc *sc = (struct sxitemp_softc *)self;
+	struct fdt_attach_args *faa = aux;
+	int node = faa->fa_node;
+
+	if (faa->fa_nreg < 1) {
+		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_ioh)) {
+		printf(": can't map registers\n");
+		return;
+	}
+
+	printf("\n");
+
+	pinctrl_byname(node, "default");
+
+	clock_enable_all(node);
+	reset_deassert_all(node);
+
+	/* Start data acquisition. */
+	HWRITE4(sc, THS_FILTER, THS_FILTER_EN | THS_FILTER_TYPE(1));
+	HWRITE4(sc, THS_INT_CTRL, THS_INT_CTRL_THERMAL_PER(800));
+	HWRITE4(sc, THS_CTRL0, THS_CTRL0_SENSOR_ACQ(31));
+	HWRITE4(sc, THS_CTRL2, THS_CTRL2_ADC_ACQ(31) |
+	    THS_CTRL2_SENSE0_EN | THS_CTRL2_SENSE1_EN);
+
+	/* Register sensors. */
+	strlcpy(sc->sc_sensordev.xname, sc->sc_dev.dv_xname,
+	    sizeof(sc->sc_sensordev.xname));
+	strlcpy(sc->sc_sensors[0].desc, "CPU", sizeof(sc->sc_sensors[0].desc));
+	sc->sc_sensors[0].type = SENSOR_TEMP;
+	sc->sc_sensors[0].flags = SENSOR_FINVALID;
+	sensor_attach(&sc->sc_sensordev, &sc->sc_sensors[0]);
+	strlcpy(sc->sc_sensors[1].desc, "GPU", sizeof(sc->sc_sensors[1].desc));
+	sc->sc_sensors[1].type = SENSOR_TEMP;
+	sc->sc_sensors[1].flags = SENSOR_FINVALID;
+	sensor_attach(&sc->sc_sensordev, &sc->sc_sensors[1]);
+	sensordev_install(&sc->sc_sensordev);
+	sensor_task_register(sc, sxitemp_refresh_sensors, 5);
+}
+
+uint64_t
+sxitemp_calc_temp0(int64_t data)
+{
+	if (data > 0x500)
+		return -119100 * data + 223000000;
+	else
+		return -145200 * data + 259000000;
+}
+
+uint64_t
+sxitemp_calc_temp1(int64_t data)
+{
+	if (data > 0x500)
+		return -119100 * data + 223000000;
+	else
+		return -159000 * data + 276000000;
+}
+
+void
+sxitemp_refresh_sensors(void *arg)
+{
+	struct sxitemp_softc *sc = arg;
+	uint32_t data;
+
+	data = HREAD4(sc, THS0_DATA);
+	sc->sc_sensors[0].value = sxitemp_calc_temp0(data) + 273150000;
+	sc->sc_sensors[0].flags &= ~SENSOR_FINVALID;
+
+	data = HREAD4(sc, THS1_DATA);
+	sc->sc_sensors[1].value = sxitemp_calc_temp1(data) + 273150000;
+	sc->sc_sensors[1].flags &= ~SENSOR_FINVALID;
+}