125 lines
3.4 KiB
C
125 lines
3.4 KiB
C
/*-
|
|
* Copyright (c) 2015,2016 Annapurna Labs Ltd. and affiliates
|
|
* All rights reserved.
|
|
*
|
|
* Developed by Semihalf.
|
|
*
|
|
* 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>
|
|
#include <sys/param.h>
|
|
#include <sys/bus.h>
|
|
#include <sys/conf.h>
|
|
#include <sys/rman.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/module.h>
|
|
#include <sys/resource.h>
|
|
#include <sys/systm.h>
|
|
|
|
#include <machine/bus.h>
|
|
#include <dev/ofw/ofw_bus_subr.h>
|
|
|
|
#define AL_NB_ACF_MISC_OFFSET 0xD0
|
|
#define AL_NB_ACF_MISC_READ_BYPASS (1 << 30)
|
|
|
|
static struct resource_spec nb_service_spec[] = {
|
|
{ SYS_RES_MEMORY, 0, RF_ACTIVE },
|
|
{ -1, 0 }
|
|
};
|
|
|
|
struct nb_service_softc {
|
|
struct resource *res;
|
|
};
|
|
|
|
static int nb_service_probe(device_t dev);
|
|
static int nb_service_attach(device_t dev);
|
|
static int nb_service_detach(device_t dev);
|
|
|
|
static device_method_t nb_service_methods[] = {
|
|
DEVMETHOD(device_probe, nb_service_probe),
|
|
DEVMETHOD(device_attach, nb_service_attach),
|
|
DEVMETHOD(device_detach, nb_service_detach),
|
|
{ 0, 0 }
|
|
};
|
|
|
|
static driver_t nb_service_driver = {
|
|
"nb_service",
|
|
nb_service_methods,
|
|
sizeof(struct nb_service_softc)
|
|
};
|
|
|
|
EARLY_DRIVER_MODULE(nb_service, simplebus, nb_service_driver, 0, 0,
|
|
BUS_PASS_CPU + BUS_PASS_ORDER_MIDDLE);
|
|
EARLY_DRIVER_MODULE(nb_service, ofwbus, nb_service_driver, 0, 0,
|
|
BUS_PASS_CPU + BUS_PASS_ORDER_MIDDLE);
|
|
|
|
static int
|
|
nb_service_probe(device_t dev)
|
|
{
|
|
|
|
if (!ofw_bus_status_okay(dev))
|
|
return (ENXIO);
|
|
|
|
if (!ofw_bus_is_compatible(dev, "annapurna-labs,al-nb-service"))
|
|
return (ENXIO);
|
|
|
|
device_set_desc(dev, "Alpine North Bridge Service");
|
|
|
|
return (BUS_PROBE_DEFAULT);
|
|
}
|
|
|
|
static int
|
|
nb_service_attach(device_t dev)
|
|
{
|
|
struct nb_service_softc *sc;
|
|
uint32_t val;
|
|
int err;
|
|
|
|
sc = device_get_softc(dev);
|
|
|
|
err = bus_alloc_resources(dev, nb_service_spec, &sc->res);
|
|
if (err != 0) {
|
|
device_printf(dev, "could not allocate resources\n");
|
|
return (err);
|
|
}
|
|
|
|
/* Do not allow reads to bypass writes to different addresses */
|
|
val = bus_read_4(sc->res, AL_NB_ACF_MISC_OFFSET);
|
|
val &= ~AL_NB_ACF_MISC_READ_BYPASS;
|
|
bus_write_4(sc->res, AL_NB_ACF_MISC_OFFSET, val);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
nb_service_detach(device_t dev)
|
|
{
|
|
struct nb_service_softc *sc;
|
|
|
|
sc = device_get_softc(dev);
|
|
|
|
bus_release_resources(dev, nb_service_spec, &sc->res);
|
|
|
|
return (0);
|
|
}
|