285 lines
7.0 KiB
C
285 lines
7.0 KiB
C
/*-
|
|
* Copyright 2013-2015 John Wehle <john@feith.com>
|
|
* 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.
|
|
*/
|
|
|
|
/*
|
|
* Amlogic aml8726 I2C driver.
|
|
*
|
|
* Currently this implementation doesn't take full advantage of the hardware.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/bus.h>
|
|
#include <sys/conf.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/lock.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/malloc.h>
|
|
#include <sys/module.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/rman.h>
|
|
|
|
#include <machine/bus.h>
|
|
|
|
#include <dev/fdt/fdt_common.h>
|
|
#include <dev/ofw/ofw_bus.h>
|
|
#include <dev/ofw/ofw_bus_subr.h>
|
|
|
|
#include <dev/iicbus/iiconf.h>
|
|
#include <dev/iicbus/iicbus.h>
|
|
|
|
#include "iicbb_if.h"
|
|
|
|
|
|
struct aml8726_iic_softc {
|
|
device_t dev;
|
|
struct resource *res[1];
|
|
struct mtx mtx;
|
|
device_t iicbb;
|
|
};
|
|
|
|
static struct resource_spec aml8726_iic_spec[] = {
|
|
{ SYS_RES_MEMORY, 0, RF_ACTIVE },
|
|
{ -1, 0 }
|
|
};
|
|
|
|
#define AML_I2C_LOCK(sc) mtx_lock(&(sc)->mtx)
|
|
#define AML_I2C_UNLOCK(sc) mtx_unlock(&(sc)->mtx)
|
|
#define AML_I2C_LOCK_INIT(sc) \
|
|
mtx_init(&(sc)->mtx, device_get_nameunit((sc)->dev), \
|
|
"i2c", MTX_DEF)
|
|
#define AML_I2C_LOCK_DESTROY(sc) mtx_destroy(&(sc)->mtx);
|
|
|
|
#define AML_I2C_CTRL_REG 0
|
|
#define AML_I2C_MANUAL_SDA_I (1 << 26)
|
|
#define AML_I2C_MANUAL_SCL_I (1 << 25)
|
|
#define AML_I2C_MANUAL_SDA_O (1 << 24)
|
|
#define AML_I2C_MANUAL_SCL_O (1 << 23)
|
|
#define AML_I2C_MANUAL_EN (1 << 22)
|
|
|
|
#define CSR_WRITE_4(sc, reg, val) bus_write_4((sc)->res[0], reg, (val))
|
|
#define CSR_READ_4(sc, reg) bus_read_4((sc)->res[0], reg)
|
|
|
|
static int
|
|
aml8726_iic_probe(device_t dev)
|
|
{
|
|
|
|
if (!ofw_bus_status_okay(dev))
|
|
return (ENXIO);
|
|
|
|
if (!ofw_bus_is_compatible(dev, "amlogic,meson6-i2c"))
|
|
return (ENXIO);
|
|
|
|
device_set_desc(dev, "Amlogic aml8726 I2C");
|
|
|
|
return (BUS_PROBE_DEFAULT);
|
|
}
|
|
|
|
static int
|
|
aml8726_iic_attach(device_t dev)
|
|
{
|
|
struct aml8726_iic_softc *sc = device_get_softc(dev);
|
|
int error;
|
|
|
|
sc->dev = dev;
|
|
|
|
if (bus_alloc_resources(dev, aml8726_iic_spec, sc->res)) {
|
|
device_printf(dev, "can not allocate resources for device\n");
|
|
return (ENXIO);
|
|
}
|
|
|
|
AML_I2C_LOCK_INIT(sc);
|
|
|
|
sc->iicbb = device_add_child(dev, "iicbb", -1);
|
|
|
|
if (sc->iicbb == NULL) {
|
|
device_printf(dev, "could not add iicbb\n");
|
|
error = ENXIO;
|
|
goto fail;
|
|
}
|
|
|
|
error = device_probe_and_attach(sc->iicbb);
|
|
|
|
if (error) {
|
|
device_printf(dev, "could not attach iicbb\n");
|
|
goto fail;
|
|
}
|
|
|
|
return (0);
|
|
|
|
fail:
|
|
AML_I2C_LOCK_DESTROY(sc);
|
|
bus_release_resources(dev, aml8726_iic_spec, sc->res);
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
aml8726_iic_detach(device_t dev)
|
|
{
|
|
struct aml8726_iic_softc *sc = device_get_softc(dev);
|
|
device_t child;
|
|
|
|
/*
|
|
* Detach the children before recursively deleting
|
|
* in case a child has a pointer to a grandchild
|
|
* which is used by the child's detach routine.
|
|
*
|
|
* Remember the child before detaching so we can
|
|
* delete it (bus_generic_detach indirectly zeroes
|
|
* sc->child_dev).
|
|
*/
|
|
child = sc->iicbb;
|
|
bus_generic_detach(dev);
|
|
if (child)
|
|
device_delete_child(dev, child);
|
|
|
|
AML_I2C_LOCK_DESTROY(sc);
|
|
|
|
bus_release_resources(dev, aml8726_iic_spec, sc->res);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
aml8726_iic_child_detached(device_t dev, device_t child)
|
|
{
|
|
struct aml8726_iic_softc *sc = device_get_softc(dev);
|
|
|
|
if (child == sc->iicbb)
|
|
sc->iicbb = NULL;
|
|
}
|
|
|
|
static int
|
|
aml8726_iic_callback(device_t dev, int index, caddr_t data)
|
|
{
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
aml8726_iic_reset(device_t dev, u_char speed, u_char addr, u_char *oldaddr)
|
|
{
|
|
struct aml8726_iic_softc *sc = device_get_softc(dev);
|
|
|
|
AML_I2C_LOCK(sc);
|
|
|
|
CSR_WRITE_4(sc, AML_I2C_CTRL_REG,
|
|
(CSR_READ_4(sc, AML_I2C_CTRL_REG) | AML_I2C_MANUAL_SDA_O |
|
|
AML_I2C_MANUAL_SCL_O | AML_I2C_MANUAL_EN));
|
|
|
|
AML_I2C_UNLOCK(sc);
|
|
|
|
/* Wait for 10 usec */
|
|
DELAY(10);
|
|
|
|
return (IIC_ENOADDR);
|
|
}
|
|
|
|
static int
|
|
aml8726_iic_getscl(device_t dev)
|
|
{
|
|
struct aml8726_iic_softc *sc = device_get_softc(dev);
|
|
|
|
return (CSR_READ_4(sc, AML_I2C_CTRL_REG) & AML_I2C_MANUAL_SCL_I);
|
|
}
|
|
|
|
static int
|
|
aml8726_iic_getsda(device_t dev)
|
|
{
|
|
struct aml8726_iic_softc *sc = device_get_softc(dev);
|
|
|
|
return (CSR_READ_4(sc, AML_I2C_CTRL_REG) & AML_I2C_MANUAL_SDA_I);
|
|
}
|
|
|
|
static void
|
|
aml8726_iic_setscl(device_t dev, int val)
|
|
{
|
|
struct aml8726_iic_softc *sc = device_get_softc(dev);
|
|
|
|
AML_I2C_LOCK(sc);
|
|
|
|
CSR_WRITE_4(sc, AML_I2C_CTRL_REG, ((CSR_READ_4(sc, AML_I2C_CTRL_REG) &
|
|
~AML_I2C_MANUAL_SCL_O) | (val ? AML_I2C_MANUAL_SCL_O : 0) |
|
|
AML_I2C_MANUAL_EN));
|
|
|
|
AML_I2C_UNLOCK(sc);
|
|
}
|
|
|
|
static void
|
|
aml8726_iic_setsda(device_t dev, int val)
|
|
{
|
|
struct aml8726_iic_softc *sc = device_get_softc(dev);
|
|
|
|
AML_I2C_LOCK(sc);
|
|
|
|
CSR_WRITE_4(sc, AML_I2C_CTRL_REG, ((CSR_READ_4(sc, AML_I2C_CTRL_REG) &
|
|
~AML_I2C_MANUAL_SDA_O) | (val ? AML_I2C_MANUAL_SDA_O : 0) |
|
|
AML_I2C_MANUAL_EN));
|
|
|
|
AML_I2C_UNLOCK(sc);
|
|
}
|
|
|
|
static device_method_t aml8726_iic_methods[] = {
|
|
/* Device interface */
|
|
DEVMETHOD(device_probe, aml8726_iic_probe),
|
|
DEVMETHOD(device_attach, aml8726_iic_attach),
|
|
DEVMETHOD(device_detach, aml8726_iic_detach),
|
|
|
|
/* bus interface */
|
|
DEVMETHOD(bus_child_detached, aml8726_iic_child_detached),
|
|
DEVMETHOD(bus_print_child, bus_generic_print_child),
|
|
DEVMETHOD(bus_driver_added, bus_generic_driver_added),
|
|
|
|
/* IICBB interface */
|
|
DEVMETHOD(iicbb_callback, aml8726_iic_callback),
|
|
DEVMETHOD(iicbb_reset, aml8726_iic_reset),
|
|
|
|
DEVMETHOD(iicbb_getscl, aml8726_iic_getscl),
|
|
DEVMETHOD(iicbb_getsda, aml8726_iic_getsda),
|
|
DEVMETHOD(iicbb_setscl, aml8726_iic_setscl),
|
|
DEVMETHOD(iicbb_setsda, aml8726_iic_setsda),
|
|
|
|
DEVMETHOD_END
|
|
};
|
|
|
|
static driver_t aml8726_iic_driver = {
|
|
"aml8726_iic",
|
|
aml8726_iic_methods,
|
|
sizeof(struct aml8726_iic_softc),
|
|
};
|
|
|
|
static devclass_t aml8726_iic_devclass;
|
|
|
|
DRIVER_MODULE(aml8726_iic, simplebus, aml8726_iic_driver,
|
|
aml8726_iic_devclass, 0, 0);
|
|
DRIVER_MODULE(iicbb, aml8726_iic, iicbb_driver, iicbb_devclass, 0, 0);
|
|
MODULE_DEPEND(aml8726_iic, iicbb, IICBB_MINVER, IICBB_PREFVER, IICBB_MAXVER);
|
|
MODULE_VERSION(aml8726_iic, 1);
|