Author: manu
Date: Tue Aug 23 22:26:50 2016
New Revision: 304710
URL: https://svnweb.freebsd.org/changeset/base/304710
Log:
Allwinner: Add thermal sensor driver for A10/A20
The thermal sensor lives in the touch screen controller. Touch screen part
isn't done for now.
Temperature is read every ~2 seconds and exposed via sysctl.
Added:
head/sys/arm/allwinner/aw_ts.c (contents, props changed)
Modified:
head/sys/arm/allwinner/files.allwinner
Added: head/sys/arm/allwinner/aw_ts.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/sys/arm/allwinner/aw_ts.c Tue Aug 23 22:26:50 2016
(r304710)
@@ -0,0 +1,230 @@
+/*-
+ * Copyright (c) 2016 Emmanuel Vadot <m...@freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Allwinner Touch Sreen driver
+ * Touch screen part is not done, only the thermal sensor part is.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/bus.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+#include <sys/rman.h>
+#include <sys/sysctl.h>
+#include <machine/bus.h>
+
+#include <dev/fdt/fdt_common.h>
+#include <dev/ofw/openfirm.h>
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+#define READ(_sc, _r) bus_read_4((_sc)->res[0], (_r))
+#define WRITE(_sc, _r, _v) bus_write_4((_sc)->res[0], (_r), (_v))
+
+/* Control register 0 */
+#define TP_CTRL0 0x00
+#define TP_CTRL0_TACQ(x) ((x & 0xFF) << 0)
+#define TP_CTRL0_FS_DIV(x) ((x & 0xF) << 16)
+#define TP_CTRL0_CLK_DIV(x) ((x & 0x3) << 20)
+#define TP_CTRL0_CLK_SELECT(x) ((x & 0x1) << 22)
+
+/* Control register 1 */
+#define TP_CTRL1 0x04
+#define TP_CTRL1_MODE_EN (1 << 4)
+
+/* Control register 2 */
+#define TP_CTRL2 0x08
+
+/* Control register 3 */
+#define TP_CTRL3 0x0C
+
+/* Int/FIFO control register */
+#define TP_FIFOC 0x10
+#define TP_FIFOC_TEMP_IRQ_ENABLE (1 << 18)
+
+/* Int/FIFO status register */
+#define TP_FIFOS 0x14
+#define TP_FIFOS_TEMP_IRQ_PENDING (1 << 18)
+
+/* Temperature Period Register */
+#define TP_TPR 0x18
+#define TP_TPR_TEMP_EN (1 << 16)
+#define TP_TPR_TEMP_PERIOD(x) (x << 0)
+
+/* Common data register */
+#define TP_CDAT 0x1C
+
+/* Temperature data register */
+#define TEMP_DATA 0x20
+
+/* TP Data register*/
+#define TP_DATA 0x24
+
+/* TP IO config register */
+#define TP_IO_CONFIG 0x28
+
+/* TP IO port data register */
+#define TP_IO_DATA 0x2C
+
+struct aw_ts_softc {
+ device_t dev;
+ struct resource * res[2];
+ void * intrhand;
+ int temp_data;
+ int temp_offset;
+ int temp_step;
+};
+
+static struct resource_spec aw_ts_spec[] = {
+ { SYS_RES_MEMORY, 0, RF_ACTIVE },
+ { SYS_RES_IRQ, 0, RF_ACTIVE | RF_SHAREABLE },
+ { -1, 0 }
+};
+
+#define A10_TS 1
+#define A13_TS 2
+
+#define AW_TS_TEMP_SYSCTL 1
+
+static struct ofw_compat_data compat_data[] = {
+ {"allwinner,sun4i-a10-ts", A10_TS},
+ {"allwinner,sun5i-a13-ts", A13_TS},
+ {NULL, 0}
+};
+
+static void
+aw_ts_intr(void *arg)
+{
+ struct aw_ts_softc *sc;
+ int val;
+
+ sc= (struct aw_ts_softc *)arg;
+
+ val = READ(sc, TP_FIFOS);
+ if (val & TP_FIFOS_TEMP_IRQ_PENDING) {
+ /* Convert the value to millicelsius then millikelvin */
+ sc->temp_data = (READ(sc, TEMP_DATA) * sc->temp_step -
sc->temp_offset)
+ + 273150;
+ }
+
+ WRITE(sc, TP_FIFOS, val);
+}
+
+static int
+aw_ts_probe(device_t dev)
+{
+
+ if (!ofw_bus_status_okay(dev))
+ return (ENXIO);
+
+ if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0)
+ return (ENXIO);
+
+ device_set_desc(dev, "Allwinner Touch Screen controller");
+ return (BUS_PROBE_DEFAULT);
+}
+
+static int
+aw_ts_attach(device_t dev)
+{
+ struct aw_ts_softc *sc;
+
+ sc = device_get_softc(dev);
+ sc->dev = dev;
+
+ if (bus_alloc_resources(dev, aw_ts_spec, sc->res) != 0) {
+ device_printf(dev, "could not allocate memory resource\n");
+ return (ENXIO);
+ }
+
+ if (bus_setup_intr(dev, sc->res[1],
+ INTR_TYPE_MISC | INTR_MPSAFE, NULL, aw_ts_intr, sc,
+ &sc->intrhand)) {
+ bus_release_resources(dev, aw_ts_spec, sc->res);
+ device_printf(dev, "cannot setup interrupt handler\n");
+ return (ENXIO);
+ }
+
+ /*
+ * Thoses magic values were taken from linux which take them from
+ * the allwinner SDK or found them by deduction
+ */
+ switch (ofw_bus_search_compatible(dev, compat_data)->ocd_data) {
+ case A10_TS:
+ sc->temp_offset = 257000;
+ sc->temp_step = 133;
+ break;
+ case A13_TS:
+ sc->temp_offset = 144700;
+ sc->temp_step = 100;
+ break;
+ }
+
+ /* Enable clock and set divisers */
+ WRITE(sc, TP_CTRL0, TP_CTRL0_CLK_SELECT(0) |
+ TP_CTRL0_CLK_DIV(2) |
+ TP_CTRL0_FS_DIV(7) |
+ TP_CTRL0_TACQ(63));
+
+ /* Enable TS module */
+ WRITE(sc, TP_CTRL1, TP_CTRL1_MODE_EN);
+
+ /* Enable Temperature, period is ~2s */
+ WRITE(sc, TP_TPR, TP_TPR_TEMP_EN | TP_TPR_TEMP_PERIOD(1953));
+
+ /* Enable temp irq */
+ WRITE(sc, TP_FIFOC, TP_FIFOC_TEMP_IRQ_ENABLE);
+
+ /* Add sysctl */
+ SYSCTL_ADD_PROC(device_get_sysctl_ctx(dev),
+ SYSCTL_CHILDREN(device_get_sysctl_tree(dev)),
+ OID_AUTO, "temperature", CTLTYPE_INT | CTLFLAG_RD,
+ &sc->temp_data, 0, sysctl_handle_int,
+ "IK3", "CPU Temperature");
+
+ return (0);
+}
+
+static device_method_t aw_ts_methods[] = {
+ DEVMETHOD(device_probe, aw_ts_probe),
+ DEVMETHOD(device_attach, aw_ts_attach),
+
+ DEVMETHOD_END
+};
+
+static driver_t aw_ts_driver = {
+ "aw_ts",
+ aw_ts_methods,
+ sizeof(struct aw_ts_softc),
+};
+static devclass_t aw_ts_devclass;
+
+DRIVER_MODULE(aw_ts, simplebus, aw_ts_driver, aw_ts_devclass, 0, 0);
Modified: head/sys/arm/allwinner/files.allwinner
==============================================================================
--- head/sys/arm/allwinner/files.allwinner Tue Aug 23 22:04:59 2016
(r304709)
+++ head/sys/arm/allwinner/files.allwinner Tue Aug 23 22:26:50 2016
(r304710)
@@ -14,6 +14,7 @@ arm/allwinner/aw_nmi.c optional
intrng
arm/allwinner/aw_if_dwc.c optional dwc
arm/allwinner/aw_rsb.c optional rsb
arm/allwinner/aw_rtc.c standard
+arm/allwinner/aw_ts.c standard
arm/allwinner/aw_wdog.c standard
arm/allwinner/aw_machdep.c standard
arm/allwinner/aw_mp.c optional smp
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