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/*-
* Copyright (c) 2014 Boris Samorodov <bsam@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.
*
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/malloc.h>
#include <sys/rman.h>
#include <machine/bus.h>
#include <machine/fdt.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>
#include <arm/freescale/imx/imx_iomuxvar.h>
#include "imx6_iomuxreg.h"
#define IOMUX_WRITE(_sc, _r, _v) \
bus_write_4((_sc)->sc_res, (_r), (_v))
#define IOMUX_READ(_sc, _r) \
bus_read_4((_sc)->sc_res, (_r))
#define IOMUX_SET(_sc, _r, _m) \
IOMUX_WRITE((_sc), (_r), IOMUX_READ((_sc), (_r)) | (_m))
#define IOMUX_CLEAR(_sc, _r, _m) \
IOMUX_WRITE((_sc), (_r), IOMUX_READ((_sc), (_r)) & ~(_m))
struct imx6_iomux_softc {
struct resource *sc_res;
device_t sc_dev;
};
static struct imx6_iomux_softc *iomuxsc = NULL;
static struct resource_spec imx6_iomux_spec[] = {
{ SYS_RES_MEMORY, 0, RF_ACTIVE },
{ SYS_RES_IRQ, 0, RF_ACTIVE },
{ -1, 0 }
};
static int
imx6_iomux_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (!ofw_bus_is_compatible(dev, "fsl,imx6-iomux"))
return (ENXIO);
device_set_desc(dev, "Freescale i.MX6 IO pins multiplexor");
return (BUS_PROBE_DEFAULT);
}
static int
imx6_iomux_attach(device_t dev)
{
struct imx6_iomux_softc * sc;
sc = device_get_softc(dev);
if (bus_alloc_resources(dev, imx6_iomux_spec, &sc->sc_res)) {
device_printf(dev, "could not allocate resources\n");
return (ENXIO);
}
iomuxsc = sc;
/*
* XXX: place to fetch all info about pinmuxing from loader data
* (FDT blob) and apply. Loader (1st one) must care about
* device-to-device difference.
*/
return (0);
}
static int
imx6_iomux_detach(device_t dev)
{
/* IOMUX registers are always accessible. */
return (EBUSY);
}
static void
iomux_set_pad_sub(struct imx6_iomux_softc *sc, uint32_t pin, uint32_t config)
{
bus_size_t pad_ctl_reg = IOMUX_PIN_TO_PAD_ADDRESS(pin);
if (pad_ctl_reg != IOMUX_PAD_NONE)
IOMUX_WRITE(sc, pad_ctl_reg, config);
}
void
iomux_set_pad(unsigned int pin, unsigned int config)
{
if (iomuxsc == NULL)
return;
iomux_set_pad_sub(iomuxsc, pin, config);
}
static void
iomux_set_function_sub(struct imx6_iomux_softc *sc, uint32_t pin, uint32_t fn)
{
bus_size_t mux_ctl_reg = IOMUX_PIN_TO_MUX_ADDRESS(pin);
if (mux_ctl_reg != IOMUX_MUX_NONE)
IOMUX_WRITE(sc, mux_ctl_reg, fn);
}
void
iomux_set_function(unsigned int pin, unsigned int fn)
{
if (iomuxsc == NULL)
return;
iomux_set_function_sub(iomuxsc, pin, fn);
}
static uint32_t
iomux_get_pad_config_sub(struct imx6_iomux_softc *sc, uint32_t pin)
{
bus_size_t pad_reg = IOMUX_PIN_TO_PAD_ADDRESS(pin);
uint32_t result;
result = IOMUX_READ(sc, pad_reg);
return(result);
}
unsigned int
iomux_get_pad_config(unsigned int pin)
{
return(iomux_get_pad_config_sub(iomuxsc, pin));
}
static device_method_t imx6_iomux_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, imx6_iomux_probe),
DEVMETHOD(device_attach, imx6_iomux_attach),
DEVMETHOD(device_detach, imx6_iomux_detach),
DEVMETHOD_END
};
static driver_t imx6_iomux_driver = {
"imx6_iomux",
imx6_iomux_methods,
sizeof(struct imx6_iomux_softc),
};
static devclass_t imx6_iomux_devclass;
EARLY_DRIVER_MODULE(imx6_iomux, simplebus, imx6_iomux_driver,
imx6_iomux_devclass, 0, 0, BUS_PASS_CPU + BUS_PASS_ORDER_LATE);
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