mirror of
https://github.com/freebsd/freebsd-src
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156b97fa1f
going to poll virtqueue. Use on BERI soft-core to invalidate cpu caches. Reviewed by: bryanv Sponsored by: DARPA, AFRL
267 lines
6.1 KiB
C
267 lines
6.1 KiB
C
/*-
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* Copyright (c) 2014 Ruslan Bukin <br@bsdpad.com>
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* All rights reserved.
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*
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* This software was developed by SRI International and the University of
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* Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
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* ("CTSRD"), as part of the DARPA CRASH research programme.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* BERI interface for Virtio MMIO bus.
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*
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* This driver provides interrupt-engine for software-implemented
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* Virtio MMIO backend.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/malloc.h>
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#include <sys/rman.h>
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#include <sys/timeet.h>
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#include <sys/timetc.h>
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#include <sys/watchdog.h>
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#include <machine/bus.h>
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#include <machine/fdt.h>
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#include <machine/cpu.h>
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#include <machine/cache.h>
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#include <dev/fdt/fdt_common.h>
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#include <dev/ofw/openfirm.h>
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#include <dev/beri/virtio/virtio_mmio_platform.h>
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#include <dev/virtio/mmio/virtio_mmio.h>
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#include <dev/altera/pio/pio.h>
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#include "virtio_mmio_if.h"
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#include "pio_if.h"
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static void platform_intr(void *arg);
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struct virtio_mmio_platform_softc {
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struct resource *res[1];
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bus_space_tag_t bst;
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bus_space_handle_t bsh;
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device_t dev;
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void (*intr_handler)(void *);
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void *ih_user;
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device_t pio_recv;
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device_t pio_send;
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};
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static int
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setup_pio(struct virtio_mmio_platform_softc *sc, char *name, device_t *dev)
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{
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phandle_t pio_node;
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struct fdt_ic *ic;
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phandle_t xref;
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phandle_t node;
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if ((node = ofw_bus_get_node(sc->dev)) == -1)
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return (ENXIO);
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if (OF_searchencprop(node, name, &xref,
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sizeof(xref)) == -1) {
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return (ENXIO);
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}
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pio_node = OF_node_from_xref(xref);
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SLIST_FOREACH(ic, &fdt_ic_list_head, fdt_ics) {
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if (ic->iph == pio_node) {
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*dev = ic->dev;
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PIO_CONFIGURE(*dev, PIO_OUT_ALL,
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PIO_UNMASK_ALL);
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return (0);
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}
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}
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return (ENXIO);
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}
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static int
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virtio_mmio_platform_probe(device_t dev)
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{
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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if (!ofw_bus_is_compatible(dev, "beri,virtio_mmio_platform"))
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return (ENXIO);
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device_set_desc(dev, "Virtio MMIO platform");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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virtio_mmio_platform_attach(device_t dev)
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{
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struct virtio_mmio_platform_softc *sc;
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struct fdt_ic *fic;
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phandle_t node;
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sc = device_get_softc(dev);
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sc->dev = dev;
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if (setup_pio(sc, "pio-send", &sc->pio_send) != 0)
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return (ENXIO);
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if (setup_pio(sc, "pio-recv", &sc->pio_recv) != 0)
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return (ENXIO);
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if ((node = ofw_bus_get_node(sc->dev)) == -1)
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return (ENXIO);
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fic = malloc(sizeof(*fic), M_DEVBUF, M_WAITOK|M_ZERO);
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fic->iph = node;
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fic->dev = dev;
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SLIST_INSERT_HEAD(&fdt_ic_list_head, fic, fdt_ics);
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return (0);
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}
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static int
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platform_note(device_t dev, size_t offset, int val)
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{
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struct virtio_mmio_platform_softc *sc;
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int note;
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int i;
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sc = device_get_softc(dev);
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switch (offset) {
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case (VIRTIO_MMIO_QUEUE_NOTIFY):
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if (val == 0)
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note = Q_NOTIFY;
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else if (val == 1)
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note = Q_NOTIFY1;
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break;
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case (VIRTIO_MMIO_QUEUE_PFN):
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note = Q_PFN;
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break;
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case (VIRTIO_MMIO_QUEUE_SEL):
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note = Q_SEL;
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break;
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default:
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note = 0;
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}
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if (note) {
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mips_dcache_wbinv_all();
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PIO_SET(sc->pio_send, note, 1);
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/*
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* Wait until host ack the request.
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* Usually done within few cycles.
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* TODO: bad
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*/
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for (i = 100; i > 0; i--) {
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if (PIO_READ(sc->pio_send) == 0)
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break;
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}
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if (i == 0)
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device_printf(sc->dev, "Warning: host busy\n");
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}
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return (0);
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}
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static void
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platform_intr(void *arg)
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{
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struct virtio_mmio_platform_softc *sc;
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int reg;
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sc = arg;
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/* Read pending */
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reg = PIO_READ(sc->pio_recv);
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/* Ack */
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PIO_SET(sc->pio_recv, reg, 0);
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/* Writeback, invalidate cache */
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mips_dcache_wbinv_all();
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if (sc->intr_handler != NULL)
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sc->intr_handler(sc->ih_user);
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}
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static int
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platform_setup_intr(device_t dev, device_t mmio_dev,
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void *intr_handler, void *ih_user)
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{
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struct virtio_mmio_platform_softc *sc;
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sc = device_get_softc(dev);
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sc->intr_handler = intr_handler;
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sc->ih_user = ih_user;
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PIO_SETUP_IRQ(sc->pio_recv, platform_intr, sc);
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return (0);
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}
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static int
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platform_poll(device_t dev)
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{
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mips_dcache_wbinv_all();
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return (0);
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}
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static device_method_t virtio_mmio_platform_methods[] = {
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DEVMETHOD(device_probe, virtio_mmio_platform_probe),
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DEVMETHOD(device_attach, virtio_mmio_platform_attach),
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/* virtio_mmio_if.h */
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DEVMETHOD(virtio_mmio_note, platform_note),
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DEVMETHOD(virtio_mmio_poll, platform_poll),
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DEVMETHOD(virtio_mmio_setup_intr, platform_setup_intr),
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DEVMETHOD_END
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};
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static driver_t virtio_mmio_platform_driver = {
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"virtio_mmio_platform",
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virtio_mmio_platform_methods,
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sizeof(struct virtio_mmio_platform_softc),
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};
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static devclass_t virtio_mmio_platform_devclass;
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DRIVER_MODULE(virtio_mmio_platform, simplebus, virtio_mmio_platform_driver,
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virtio_mmio_platform_devclass, 0, 0);
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