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/*-
* 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);
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