path: root/sys/arm/freescale/imx/imx51_iomux.c

/*	$NetBSD: imx51_iomux.c,v 1.3 2012/04/15 09:51:31 bsh Exp $	*/

/*
 * Copyright (c) 2009, 2010  Genetec Corporation.  All rights reserved.
 * Written by Hashimoto Kenichi for Genetec Corporation.
 *
 * 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 GENETEC CORPORATION ``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 GENETEC CORPORATION
 * 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.
 */

/*-
 * Copyright (c) 2012, 2013 The FreeBSD Foundation
 * All rights reserved.
 *
 * Portions of this software were developed by Oleksandr Rybalko
 * under sponsorship from the FreeBSD Foundation.
 *
 * 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.
 */

#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/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 <arm/freescale/imx/imx51_iomuxvar.h>
#include <arm/freescale/imx/imx51_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 iomux_softc {
	struct resource	*sc_res;
	device_t 	sc_dev;
};

static int iomux_probe(device_t);
static int iomux_attach(device_t);

static struct iomux_softc *iomuxsc = NULL;

static struct resource_spec imx_iomux_spec[] = {
	{ SYS_RES_MEMORY,	0,	RF_ACTIVE },	/* Global registers */
	{ -1, 0 }
};

static int
iomux_probe(device_t dev)
{

	if (!ofw_bus_status_okay(dev))
		return (ENXIO);

	if (!ofw_bus_is_compatible(dev, "fsl,imx51-iomux") &&
	    !ofw_bus_is_compatible(dev, "fsl,imx53-iomux"))
		return (ENXIO);

	device_set_desc(dev, "Freescale i.MX51 IO pins multiplexor");
	return (BUS_PROBE_DEFAULT);
}

static int
iomux_attach(device_t dev)
{
	struct iomux_softc * sc;

	sc = device_get_softc(dev);

	if (bus_alloc_resources(dev, imx_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 void
iomux_set_function_sub(struct 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 void
iomux_set_pad_sub(struct 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);
}

#ifdef notyet
void
iomux_set_input(unsigned int input, unsigned int config)
{
	bus_size_t input_ctl_reg = input;

	bus_space_write_4(iomuxsc->iomux_memt, iomuxsc->iomux_memh,
	    input_ctl_reg, config);
}
#endif

void
iomux_mux_config(const struct iomux_conf *conflist)
{
	int i;

	if (iomuxsc == NULL)
		return;
	for (i = 0; conflist[i].pin != IOMUX_CONF_EOT; i++) {
		iomux_set_pad_sub(iomuxsc, conflist[i].pin, conflist[i].pad);
		iomux_set_function_sub(iomuxsc, conflist[i].pin,
		    conflist[i].mux);
	}
}

#ifdef notyet
void
iomux_input_config(const struct iomux_input_conf *conflist)
{
	int i;

	if (iomuxsc == NULL)
		return;
	for (i = 0; conflist[i].inout != -1; i++) {
		iomux_set_inout(iomuxsc, conflist[i].inout,
		    conflist[i].inout_mode);
	}
}
#endif

uint32_t
imx_iomux_gpr_get(u_int regnum)
{

	KASSERT(iomuxsc != NULL, ("imx_iomux_gpr_get() called before attach"));
	KASSERT(regnum >= 0 && renum <= 1, 
	    ("imx_iomux_gpr_get bad regnum %u", regnum));
	return (IOMUX_READ(iomuxsc, IOMUXC_GPR0 + regnum));
}

void
imx_iomux_gpr_set(u_int regnum, uint32_t val)
{

	KASSERT(iomuxsc != NULL, ("imx_iomux_gpr_set() called before attach"));
	KASSERT(regnum >= 0 && renum <= 1, 
	    ("imx_iomux_gpr_set bad regnum %u", regnum));
	IOMUX_WRITE(iomuxsc, IOMUXC_GPR0 + regnum, val);
}

void
imx_iomux_gpr_set_masked(u_int regnum, uint32_t clrbits, uint32_t setbits)
{
	uint32_t val;

	KASSERT(iomuxsc != NULL, 
	    ("imx_iomux_gpr_set_masked called before attach"));
	KASSERT(regnum >= 0 && renum <= 1, 
	    ("imx_iomux_gpr_set_masked bad regnum %u", regnum));

	val = IOMUX_READ(iomuxsc, IOMUXC_GPR0 + regnum);
	val = (val & ~clrbits) | setbits;
	IOMUX_WRITE(iomuxsc, IOMUXC_GPR0 + regnum, val);
}

static device_method_t imx_iomux_methods[] = {
	DEVMETHOD(device_probe,		iomux_probe),
	DEVMETHOD(device_attach,	iomux_attach),

	DEVMETHOD_END
};

static driver_t imx_iomux_driver = {
	"imx_iomux",
	imx_iomux_methods,
	sizeof(struct iomux_softc),
};

static devclass_t imx_iomux_devclass;

EARLY_DRIVER_MODULE(imx_iomux, simplebus, imx_iomux_driver,
    imx_iomux_devclass, 0, 0, BUS_PASS_BUS - 1);