/*-
* 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>
__FBSDID("$FreeBSD$");
#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_CCU_SNOOP_CONTROL_IOFAB_0_OFFSET 0x4000
#define AL_CCU_SNOOP_CONTROL_IOFAB_1_OFFSET 0x5000
#define AL_CCU_SPECULATION_CONTROL_OFFSET 0x4
static struct resource_spec al_ccu_spec[] = {
{ SYS_RES_MEMORY, 0, RF_ACTIVE },
{ -1, 0 }
};
struct al_ccu_softc {
struct resource *res;
};
static int al_ccu_probe(device_t dev);
static int al_ccu_attach(device_t dev);
static int al_ccu_detach(device_t dev);
static device_method_t al_ccu_methods[] = {
DEVMETHOD(device_probe, al_ccu_probe),
DEVMETHOD(device_attach, al_ccu_attach),
DEVMETHOD(device_detach, al_ccu_detach),
{ 0, 0 }
};
static driver_t al_ccu_driver = {
"ccu",
al_ccu_methods,
sizeof(struct al_ccu_softc)
};
static devclass_t al_ccu_devclass;
EARLY_DRIVER_MODULE(al_ccu, simplebus, al_ccu_driver,
al_ccu_devclass, 0, 0, BUS_PASS_CPU + BUS_PASS_ORDER_MIDDLE);
EARLY_DRIVER_MODULE(al_ccu, ofwbus, al_ccu_driver,
al_ccu_devclass, 0, 0, BUS_PASS_CPU + BUS_PASS_ORDER_MIDDLE);
static int
al_ccu_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (!ofw_bus_is_compatible(dev, "annapurna-labs,al-ccu"))
return (ENXIO);
device_set_desc(dev, "Alpine CCU");
return (BUS_PROBE_DEFAULT);
}
static int
al_ccu_attach(device_t dev)
{
struct al_ccu_softc *sc;
int err;
sc = device_get_softc(dev);
err = bus_alloc_resources(dev, al_ccu_spec, &sc->res);
if (err != 0) {
device_printf(dev, "could not allocate resources\n");
return (err);
}
/* Enable cache snoop */
bus_write_4(sc->res, AL_CCU_SNOOP_CONTROL_IOFAB_0_OFFSET, 1);
bus_write_4(sc->res, AL_CCU_SNOOP_CONTROL_IOFAB_1_OFFSET, 1);
/* Disable speculative fetches from masters */
bus_write_4(sc->res, AL_CCU_SPECULATION_CONTROL_OFFSET, 7);
return (0);
}
static int
al_ccu_detach(device_t dev)
{
struct al_ccu_softc *sc;
sc = device_get_softc(dev);
bus_release_resources(dev, al_ccu_spec, &sc->res);
return (0);
}
