diff options
Diffstat (limited to 'sys/arm/allwinner/aw_ts.c')
| -rw-r--r-- | sys/arm/allwinner/aw_ts.c | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/sys/arm/allwinner/aw_ts.c b/sys/arm/allwinner/aw_ts.c new file mode 100644 index 0000000..e010ac4 --- /dev/null +++ b/sys/arm/allwinner/aw_ts.c @@ -0,0 +1,230 @@ +/*- + * Copyright (c) 2016 Emmanuel Vadot <manu@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); |
