/*- * Copyright (c) 2014 Ruslan Bukin * 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 __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #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, int val) { struct virtio_mmio_platform_softc *sc; int note; int i; sc = device_get_softc(dev); switch (offset) { case (VIRTIO_MMIO_QUEUE_NOTIFY): if (val == 0) note = Q_NOTIFY; else if (val == 1) note = Q_NOTIFY1; break; case (VIRTIO_MMIO_QUEUE_PFN): note = Q_PFN; break; case (VIRTIO_MMIO_QUEUE_SEL): note = Q_SEL; break; default: note = 0; } if (note) { mips_dcache_wbinv_all(); PIO_SET(sc->pio_send, note, 1); /* * Wait until host ack the request. * Usually done within few cycles. * TODO: bad */ for (i = 100; i > 0; i--) { if (PIO_READ(sc->pio_send) == 0) break; } if (i == 0) device_printf(sc->dev, "Warning: host busy\n"); } 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 int platform_poll(device_t dev) { mips_dcache_wbinv_all(); 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_poll, platform_poll), 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);