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/* $Id: imx23_digctl.c,v 1.2 2019/10/18 04:09:01 msaitoh Exp $ */
/*
* Copyright (c) 2013 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Petri Laakso.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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/param.h>
#include <sys/types.h>
#include <sys/bus.h>
#include <sys/cdefs.h>
#include <sys/device.h>
#include <sys/errno.h>
#include <sys/timetc.h>
#include <arm/imx/imx23_digctlreg.h>
#include <arm/imx/imx23_digctlvar.h>
#include <arm/imx/imx23var.h>
typedef struct digctl_softc {
device_t sc_dev;
bus_space_tag_t sc_iot;
bus_space_handle_t sc_hdl;
} *digctl_softc_t;
static int digctl_match(device_t, cfdata_t, void *);
static void digctl_attach(device_t, device_t, void *);
static int digctl_activate(device_t, enum devact);
static void digctl_reset(struct digctl_softc *);
static void digctl_init(struct digctl_softc *);
/* timecounter. */
static u_int digctl_tc_get_timecount(struct timecounter *);
static digctl_softc_t _sc = NULL;
CFATTACH_DECL3_NEW(digctl,
sizeof(struct digctl_softc),
digctl_match,
digctl_attach,
NULL,
digctl_activate,
NULL,
NULL,
0
);
static struct timecounter tc_useconds;
#define DCTL_RD(sc, reg) \
bus_space_read_4(sc->sc_iot, sc->sc_hdl, (reg))
#define DCTL_WR(sc, reg, val) \
bus_space_write_4(sc->sc_iot, sc->sc_hdl, (reg), (val))
static int
digctl_match(device_t parent, cfdata_t match, void *aux)
{
struct apb_attach_args *aa = aux;
if ((aa->aa_addr == HW_DIGCTL_BASE) && (aa->aa_size == HW_DIGCTL_SIZE))
return 1;
return 0;
}
static void
digctl_attach(device_t parent, device_t self, void *aux)
{
struct digctl_softc *sc = device_private(self);
struct apb_attach_args *aa = aux;
static int digctl_attached = 0;
sc->sc_dev = self;
sc->sc_iot = aa->aa_iot;
if (digctl_attached) {
aprint_error_dev(sc->sc_dev, "already attached\n");
return;
}
if (bus_space_map(sc->sc_iot, aa->aa_addr, aa->aa_size, 0,
&sc->sc_hdl))
{
aprint_error_dev(sc->sc_dev, "Unable to map bus space\n");
return;
}
digctl_reset(sc);
digctl_init(sc);
aprint_normal("\n");
/*
* Setup timecounter to use digctl microseconds counter.
*/
tc_useconds.tc_get_timecount = digctl_tc_get_timecount;
tc_useconds.tc_poll_pps = NULL;
tc_useconds.tc_counter_mask = 0xffffffff; /* 32bit counter. */
tc_useconds.tc_frequency = 1000000; /* @ 1MHz */
tc_useconds.tc_name = "digctl";
tc_useconds.tc_quality = 100;
/* Enable counter. */
DCTL_WR(sc, HW_DIGCTL_CTRL_CLR, HW_DIGCTL_CTRL_XTAL24M_GATE);
tc_init(&tc_useconds);
digctl_attached = 1;
return;
}
static int
digctl_activate(device_t self, enum devact act)
{
return EOPNOTSUPP;
}
/*
* Inspired by i.MX23 RM "39.3.10 Correct Way to Soft Reset a Block"
*/
static void
digctl_reset(struct digctl_softc *sc)
{
return;
}
static void
digctl_init(struct digctl_softc *sc)
{
_sc = sc;
return;
}
/*
* Control USB controller clocks.
*/
void
digctl_usb_clkgate(int value)
{
struct digctl_softc *sc = _sc;
if (sc == NULL) {
aprint_error("digctl is not initialized");
return;
}
if (value) {
/* Clocks OFF. */
DCTL_WR(sc, HW_DIGCTL_CTRL_SET, HW_DIGCTL_CTRL_USB_CLKGATE);
} else {
/* Clocks ON. */
DCTL_WR(sc, HW_DIGCTL_CTRL_CLR, HW_DIGCTL_CTRL_USB_CLKGATE);
}
return;
}
/*
*
*/
static u_int
digctl_tc_get_timecount(struct timecounter *tc)
{
struct digctl_softc *sc = _sc;
return DCTL_RD(sc, HW_DIGCTL_MICROSECONDS);
}
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