HardenedBSD/sys/arm/annapurna/alpine/alpine_ccu.c
Wojciech Macek 9d6cd3d858 Introduce support for Annapurna Alpine CCU and NB devices
This commit adds drivers for Alpine Cache Coherency Unit
and North Bridge Service whose task is to configure
the system fabric and enable cache coherency.

Obtained from:         Semihalf
Submitted by:          Michal Stanek <mst@semihalf.com>
Sponsored by:          Annapurna Labs
Reviewed by:           wma
Differential Revision: https://reviews.freebsd.org/D7565
2016-09-07 05:34:41 +00:00

132 lines
3.5 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>
__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);
}