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/*-
* Copyright (c) 2014 Ruslan Bukin <br@bsdpad.com>
* All rights reserved.
*
* This software was developed by SRI International and the University of
* Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
* ("CTSRD"), as part of the DARPA CRASH research programme.
*
* 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.
*/
/*
* BERI interface for Virtio MMIO bus.
*
* This driver provides interrupt-engine for software-implemented
* Virtio MMIO backend.
*/
#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/fdt.h>
#include <machine/cpu.h>
#include <machine/cache.h>
#include <dev/fdt/fdt_common.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <dev/beri/virtio/virtio_mmio_platform.h>
#include <dev/virtio/mmio/virtio_mmio.h>
#include <dev/altera/pio/pio.h>
#include "virtio_mmio_if.h"
#include "pio_if.h"
static void platform_intr(void *arg);
struct virtio_mmio_platform_softc {
struct resource *res[1];
bus_space_tag_t bst;
bus_space_handle_t bsh;
device_t dev;
void (*intr_handler)(void *);
void *ih_user;
device_t pio_recv;
device_t pio_send;
};
static int
setup_pio(struct virtio_mmio_platform_softc *sc, char *name, device_t *dev)
{
phandle_t pio_node;
struct fdt_ic *ic;
phandle_t xref;
phandle_t node;
if ((node = ofw_bus_get_node(sc->dev)) == -1)
return (ENXIO);
if (OF_searchencprop(node, name, &xref,
sizeof(xref)) == -1) {
return (ENXIO);
}
pio_node = OF_node_from_xref(xref);
SLIST_FOREACH(ic, &fdt_ic_list_head, fdt_ics) {
if (ic->iph == pio_node) {
*dev = ic->dev;
PIO_CONFIGURE(*dev, PIO_OUT_ALL,
PIO_UNMASK_ALL);
return (0);
}
}
return (ENXIO);
}
static int
virtio_mmio_platform_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev))
return (ENXIO);
if (!ofw_bus_is_compatible(dev, "beri,virtio_mmio_platform"))
return (ENXIO);
device_set_desc(dev, "Virtio MMIO platform");
return (BUS_PROBE_DEFAULT);
}
static int
virtio_mmio_platform_attach(device_t dev)
{
struct virtio_mmio_platform_softc *sc;
struct fdt_ic *fic;
phandle_t node;
sc = device_get_softc(dev);
sc->dev = dev;
if (setup_pio(sc, "pio-send", &sc->pio_send) != 0)
return (ENXIO);
if (setup_pio(sc, "pio-recv", &sc->pio_recv) != 0)
return (ENXIO);
if ((node = ofw_bus_get_node(sc->dev)) == -1)
return (ENXIO);
fic = malloc(sizeof(*fic), M_DEVBUF, M_WAITOK|M_ZERO);
fic->iph = node;
fic->dev = dev;
SLIST_INSERT_HEAD(&fdt_ic_list_head, fic, fdt_ics);
return (0);
}
static int
platform_note(device_t dev, size_t offset)
{
struct virtio_mmio_platform_softc *sc;
sc = device_get_softc(dev);
if (offset == VIRTIO_MMIO_QUEUE_NOTIFY) {
mips_dcache_wbinv_all();
PIO_SET(sc->pio_send, Q_NOTIFY, 1);
}
if (offset == VIRTIO_MMIO_QUEUE_PFN) {
mips_dcache_wbinv_all();
PIO_SET(sc->pio_send, Q_PFN, 1);
}
return (0);
}
static void
platform_intr(void *arg)
{
struct virtio_mmio_platform_softc *sc;
int reg;
sc = arg;
/* Read pending */
reg = PIO_READ(sc->pio_recv);
/* Ack */
PIO_SET(sc->pio_recv, reg, 0);
/* Writeback, invalidate cache */
mips_dcache_wbinv_all();
if (sc->intr_handler != NULL)
sc->intr_handler(sc->ih_user);
}
static int
platform_setup_intr(device_t dev, device_t mmio_dev,
void *intr_handler, void *ih_user)
{
struct virtio_mmio_platform_softc *sc;
sc = device_get_softc(dev);
sc->intr_handler = intr_handler;
sc->ih_user = ih_user;
PIO_SETUP_IRQ(sc->pio_recv, platform_intr, sc);
return (0);
}
static device_method_t virtio_mmio_platform_methods[] = {
DEVMETHOD(device_probe, virtio_mmio_platform_probe),
DEVMETHOD(device_attach, virtio_mmio_platform_attach),
/* virtio_mmio_if.h */
DEVMETHOD(virtio_mmio_note, platform_note),
DEVMETHOD(virtio_mmio_setup_intr, platform_setup_intr),
DEVMETHOD_END
};
static driver_t virtio_mmio_platform_driver = {
"virtio_mmio_platform",
virtio_mmio_platform_methods,
sizeof(struct virtio_mmio_platform_softc),
};
static devclass_t virtio_mmio_platform_devclass;
DRIVER_MODULE(virtio_mmio_platform, simplebus, virtio_mmio_platform_driver,
virtio_mmio_platform_devclass, 0, 0);
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