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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2013 Rui Paulo <rpaulo@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 ``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 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 <sys/timeet.h>
#include <sys/timetc.h>
#include <sys/watchdog.h>
#include <machine/bus.h>
#include <machine/cpu.h>
#include <machine/frame.h>
#include <machine/intr.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <machine/bus.h>
#include <arm/ti/ti_mbox.h>
#include <arm/ti/ti_sysc.h>
#include "mbox_if.h"
#ifdef DEBUG
#define DPRINTF(fmt, ...) do { \
printf("%s: ", __func__); \
printf(fmt, __VA_ARGS__); \
} while (0)
#else
#define DPRINTF(fmt, ...)
#endif
static device_probe_t ti_mbox_probe;
static device_attach_t ti_mbox_attach;
static device_detach_t ti_mbox_detach;
static void ti_mbox_intr(void *);
static int ti_mbox_read(device_t, int, uint32_t *);
static int ti_mbox_write(device_t, int, uint32_t);
struct ti_mbox_softc {
struct mtx sc_mtx;
struct resource *sc_mem_res;
struct resource *sc_irq_res;
void *sc_intr;
bus_space_tag_t sc_bt;
bus_space_handle_t sc_bh;
};
#define TI_MBOX_LOCK(sc) mtx_lock(&(sc)->sc_mtx)
#define TI_MBOX_UNLOCK(sc) mtx_unlock(&(sc)->sc_mtx)
static device_method_t ti_mbox_methods[] = {
DEVMETHOD(device_probe, ti_mbox_probe),
DEVMETHOD(device_attach, ti_mbox_attach),
DEVMETHOD(device_detach, ti_mbox_detach),
DEVMETHOD(mbox_read, ti_mbox_read),
DEVMETHOD(mbox_write, ti_mbox_write),
DEVMETHOD_END
};
static driver_t ti_mbox_driver = {
"ti_mbox",
ti_mbox_methods,
sizeof(struct ti_mbox_softc)
};
static devclass_t ti_mbox_devclass;
DRIVER_MODULE(ti_mbox, simplebus, ti_mbox_driver, ti_mbox_devclass, 0, 0);
MODULE_DEPEND(ti_mbox, ti_sysc, 1, 1, 1);
static __inline uint32_t
ti_mbox_reg_read(struct ti_mbox_softc *sc, uint16_t reg)
{
return (bus_space_read_4(sc->sc_bt, sc->sc_bh, reg));
}
static __inline void
ti_mbox_reg_write(struct ti_mbox_softc *sc, uint16_t reg, uint32_t val)
{
bus_space_write_4(sc->sc_bt, sc->sc_bh, reg, val);
}
static int
ti_mbox_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (ofw_bus_is_compatible(dev, "ti,omap4-mailbox")) {
device_set_desc(dev, "TI System Mailbox");
return (BUS_PROBE_DEFAULT);
}
return (ENXIO);
}
static int
ti_mbox_attach(device_t dev)
{
struct ti_mbox_softc *sc;
int rid, delay, chan;
uint32_t rev, sysconfig;
if (ti_sysc_clock_enable(device_get_parent(dev)) != 0) {
device_printf(dev, "could not enable MBOX clock\n");
return (ENXIO);
}
sc = device_get_softc(dev);
rid = 0;
mtx_init(&sc->sc_mtx, "TI mbox", NULL, MTX_DEF);
sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
RF_ACTIVE);
if (sc->sc_mem_res == NULL) {
device_printf(dev, "could not allocate memory resource\n");
return (ENXIO);
}
sc->sc_bt = rman_get_bustag(sc->sc_mem_res);
sc->sc_bh = rman_get_bushandle(sc->sc_mem_res);
rid = 0;
sc->sc_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
RF_ACTIVE);
if (sc->sc_irq_res == NULL) {
device_printf(dev, "could not allocate interrupt resource\n");
ti_mbox_detach(dev);
return (ENXIO);
}
if (bus_setup_intr(dev, sc->sc_irq_res, INTR_MPSAFE | INTR_TYPE_MISC,
NULL, ti_mbox_intr, sc, &sc->sc_intr) != 0) {
device_printf(dev, "unable to setup the interrupt handler\n");
ti_mbox_detach(dev);
return (ENXIO);
}
/*
* Reset the controller.
*/
sysconfig = ti_mbox_reg_read(sc, TI_MBOX_SYSCONFIG);
DPRINTF("initial sysconfig %d\n", sysconfig);
sysconfig |= TI_MBOX_SYSCONFIG_SOFTRST;
delay = 100;
while (ti_mbox_reg_read(sc, TI_MBOX_SYSCONFIG) &
TI_MBOX_SYSCONFIG_SOFTRST) {
delay--;
DELAY(10);
}
if (delay == 0) {
device_printf(dev, "controller reset failed\n");
ti_mbox_detach(dev);
return (ENXIO);
}
/*
* Enable smart idle mode.
*/
ti_mbox_reg_write(sc, TI_MBOX_SYSCONFIG,
ti_mbox_reg_read(sc, TI_MBOX_SYSCONFIG) | TI_MBOX_SYSCONFIG_SMARTIDLE);
rev = ti_mbox_reg_read(sc,
ti_sysc_get_rev_address_offset_host(device_get_parent(dev)));
DPRINTF("rev %d\n", rev);
device_printf(dev, "revision %d.%d\n", (rev >> 8) & 0x4, rev & 0x40);
/*
* Enable message interrupts.
*/
for (chan = 0; chan < 8; chan++)
ti_mbox_reg_write(sc, TI_MBOX_IRQENABLE_SET(chan), 1);
return (0);
}
static int
ti_mbox_detach(device_t dev)
{
struct ti_mbox_softc *sc;
sc = device_get_softc(dev);
if (sc->sc_intr)
bus_teardown_intr(dev, sc->sc_irq_res, sc->sc_intr);
if (sc->sc_irq_res)
bus_release_resource(dev, SYS_RES_IRQ, rman_get_rid(sc->sc_irq_res),
sc->sc_irq_res);
if (sc->sc_mem_res)
bus_release_resource(dev, SYS_RES_MEMORY, rman_get_rid(sc->sc_mem_res),
sc->sc_mem_res);
return (0);
}
static void
ti_mbox_intr(void *arg)
{
struct ti_mbox_softc *sc;
sc = arg;
DPRINTF("interrupt %p", sc);
}
static int
ti_mbox_read(device_t dev, int chan, uint32_t *data)
{
struct ti_mbox_softc *sc;
if (chan < 0 || chan > 7)
return (EINVAL);
sc = device_get_softc(dev);
return (ti_mbox_reg_read(sc, TI_MBOX_MESSAGE(chan)));
}
static int
ti_mbox_write(device_t dev, int chan, uint32_t data)
{
int limit = 500;
struct ti_mbox_softc *sc;
if (chan < 0 || chan > 7)
return (EINVAL);
sc = device_get_softc(dev);
TI_MBOX_LOCK(sc);
/* XXX implement interrupt method */
while (ti_mbox_reg_read(sc, TI_MBOX_FIFOSTATUS(chan)) == 1 &&
limit--) {
DELAY(10);
}
if (limit == 0) {
device_printf(dev, "FIFOSTAUS%d stuck\n", chan);
TI_MBOX_UNLOCK(sc);
return (EAGAIN);
}
ti_mbox_reg_write(sc, TI_MBOX_MESSAGE(chan), data);
return (0);
}
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