67fb10f30c
It exposes I/O resources to user space, so that programs can peek and poke at the hardware. It does not itself have knowledge about the hardware device it attaches to. Sponsored by: Juniper Networks, Inc.
385 lines
8.4 KiB
C
385 lines
8.4 KiB
C
/*-
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* Copyright (c) 2014 Marcel Moolenaar
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* All rights reserved.
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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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*
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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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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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/conf.h>
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#include <sys/cons.h>
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#include <sys/fcntl.h>
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#include <sys/interrupt.h>
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#include <sys/kdb.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/mman.h>
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#include <sys/proc.h>
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#include <sys/queue.h>
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#include <sys/reboot.h>
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#include <machine/bus.h>
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#include <sys/rman.h>
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#include <sys/uio.h>
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#include <machine/resource.h>
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#include <machine/stdarg.h>
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#include <dev/pci/pcivar.h>
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#include <dev/proto/proto.h>
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#include <dev/proto/proto_dev.h>
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CTASSERT(SYS_RES_IRQ != PROTO_RES_UNUSED &&
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SYS_RES_MEMORY != PROTO_RES_UNUSED &&
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SYS_RES_IOPORT != PROTO_RES_UNUSED);
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CTASSERT(SYS_RES_IRQ != PROTO_RES_PCICFG &&
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SYS_RES_MEMORY != PROTO_RES_PCICFG &&
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SYS_RES_IOPORT != PROTO_RES_PCICFG);
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devclass_t proto_devclass;
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char proto_driver_name[] = "proto";
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static d_open_t proto_open;
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static d_close_t proto_close;
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static d_read_t proto_read;
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static d_write_t proto_write;
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static d_ioctl_t proto_ioctl;
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static d_mmap_t proto_mmap;
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struct cdevsw proto_devsw = {
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.d_version = D_VERSION,
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.d_flags = 0,
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.d_name = proto_driver_name,
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.d_open = proto_open,
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.d_close = proto_close,
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.d_read = proto_read,
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.d_write = proto_write,
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.d_ioctl = proto_ioctl,
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.d_mmap = proto_mmap,
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};
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static MALLOC_DEFINE(M_PROTO, "PROTO", "PROTO driver");
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int
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proto_add_resource(struct proto_softc *sc, int type, int rid,
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struct resource *res)
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{
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struct proto_res *r;
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if (type == PROTO_RES_UNUSED)
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return (EINVAL);
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if (sc->sc_rescnt == PROTO_RES_MAX)
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return (ENOSPC);
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r = sc->sc_res + sc->sc_rescnt++;
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r->r_type = type;
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r->r_rid = rid;
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r->r_res = res;
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return (0);
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}
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#ifdef notyet
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static int
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proto_intr(void *arg)
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{
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struct proto_softc *sc = arg;
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/* XXX TODO */
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return (FILTER_HANDLED);
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}
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#endif
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int
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proto_attach(device_t dev)
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{
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struct proto_softc *sc;
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struct proto_res *r;
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u_int res;
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sc = device_get_softc(dev);
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sc->sc_dev = dev;
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for (res = 0; res < sc->sc_rescnt; res++) {
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r = sc->sc_res + res;
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switch (r->r_type) {
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case SYS_RES_IRQ:
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/* XXX TODO */
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break;
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case SYS_RES_MEMORY:
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case SYS_RES_IOPORT:
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r->r_size = rman_get_size(r->r_res);
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r->r_u.cdev = make_dev(&proto_devsw, res, 0, 0, 0666,
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"proto/%s/%02x.%s", device_get_desc(dev), r->r_rid,
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(r->r_type == SYS_RES_IOPORT) ? "io" : "mem");
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r->r_u.cdev->si_drv1 = sc;
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r->r_u.cdev->si_drv2 = r;
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break;
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case PROTO_RES_PCICFG:
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r->r_size = 4096;
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r->r_u.cdev = make_dev(&proto_devsw, res, 0, 0, 0666,
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"proto/%s/pcicfg", device_get_desc(dev));
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r->r_u.cdev->si_drv1 = sc;
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r->r_u.cdev->si_drv2 = r;
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break;
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}
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}
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return (0);
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}
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int
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proto_detach(device_t dev)
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{
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struct proto_softc *sc;
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struct proto_res *r;
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u_int res;
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sc = device_get_softc(dev);
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/* Don't detach if we have open device filess. */
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for (res = 0; res < sc->sc_rescnt; res++) {
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r = sc->sc_res + res;
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if (r->r_opened)
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return (EBUSY);
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}
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for (res = 0; res < sc->sc_rescnt; res++) {
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r = sc->sc_res + res;
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switch (r->r_type) {
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case SYS_RES_IRQ:
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/* XXX TODO */
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break;
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case SYS_RES_MEMORY:
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case SYS_RES_IOPORT:
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case PROTO_RES_PCICFG:
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destroy_dev(r->r_u.cdev);
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break;
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}
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if (r->r_res != NULL) {
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bus_release_resource(dev, r->r_type, r->r_rid,
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r->r_res);
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r->r_res = NULL;
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}
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r->r_type = PROTO_RES_UNUSED;
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}
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sc->sc_rescnt = 0;
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return (0);
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}
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/*
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* Device functions
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*/
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static int
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proto_open(struct cdev *cdev, int oflags, int devtype, struct thread *td)
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{
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struct proto_res *r;
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r = cdev->si_drv2;
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if (!atomic_cmpset_acq_ptr(&r->r_opened, 0UL, (uintptr_t)td->td_proc))
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return (EBUSY);
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return (0);
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}
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static int
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proto_close(struct cdev *cdev, int fflag, int devtype, struct thread *td)
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{
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struct proto_res *r;
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r = cdev->si_drv2;
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if (!atomic_cmpset_acq_ptr(&r->r_opened, (uintptr_t)td->td_proc, 0UL))
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return (ENXIO);
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return (0);
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}
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static int
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proto_read(struct cdev *cdev, struct uio *uio, int ioflag)
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{
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union {
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uint8_t x1[8];
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uint16_t x2[4];
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uint32_t x4[2];
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uint64_t x8[1];
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} buf;
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struct proto_softc *sc;
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struct proto_res *r;
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device_t dev;
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off_t ofs;
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u_long width;
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int error;
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sc = cdev->si_drv1;
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dev = sc->sc_dev;
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r = cdev->si_drv2;
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width = uio->uio_resid;
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if (width < 1 || width > 8 || bitcount16(width) > 1)
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return (EIO);
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ofs = uio->uio_offset;
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if (ofs + width > r->r_size)
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return (EIO);
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switch (width) {
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case 1:
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buf.x1[0] = (r->r_type == PROTO_RES_PCICFG) ?
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pci_read_config(dev, ofs, 1) : bus_read_1(r->r_res, ofs);
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break;
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case 2:
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buf.x2[0] = (r->r_type == PROTO_RES_PCICFG) ?
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pci_read_config(dev, ofs, 2) : bus_read_2(r->r_res, ofs);
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break;
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case 4:
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buf.x4[0] = (r->r_type == PROTO_RES_PCICFG) ?
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pci_read_config(dev, ofs, 4) : bus_read_4(r->r_res, ofs);
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break;
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#ifndef __i386__
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case 8:
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if (r->r_type == PROTO_RES_PCICFG)
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return (EINVAL);
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buf.x8[0] = bus_read_8(r->r_res, ofs);
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break;
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#endif
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default:
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return (EIO);
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}
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error = uiomove(&buf, width, uio);
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return (error);
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}
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static int
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proto_write(struct cdev *cdev, struct uio *uio, int ioflag)
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{
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union {
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uint8_t x1[8];
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uint16_t x2[4];
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uint32_t x4[2];
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uint64_t x8[1];
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} buf;
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struct proto_softc *sc;
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struct proto_res *r;
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device_t dev;
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off_t ofs;
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u_long width;
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int error;
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sc = cdev->si_drv1;
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dev = sc->sc_dev;
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r = cdev->si_drv2;
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width = uio->uio_resid;
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if (width < 1 || width > 8 || bitcount16(width) > 1)
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return (EIO);
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ofs = uio->uio_offset;
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if (ofs + width > r->r_size)
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return (EIO);
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error = uiomove(&buf, width, uio);
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if (error)
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return (error);
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switch (width) {
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case 1:
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if (r->r_type == PROTO_RES_PCICFG)
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pci_write_config(dev, ofs, buf.x1[0], 1);
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else
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bus_write_1(r->r_res, ofs, buf.x1[0]);
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break;
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case 2:
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if (r->r_type == PROTO_RES_PCICFG)
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pci_write_config(dev, ofs, buf.x2[0], 2);
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else
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bus_write_2(r->r_res, ofs, buf.x2[0]);
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break;
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case 4:
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if (r->r_type == PROTO_RES_PCICFG)
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pci_write_config(dev, ofs, buf.x4[0], 4);
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else
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bus_write_4(r->r_res, ofs, buf.x4[0]);
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break;
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#ifndef __i386__
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case 8:
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if (r->r_type == PROTO_RES_PCICFG)
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return (EINVAL);
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bus_write_8(r->r_res, ofs, buf.x8[0]);
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break;
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#endif
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default:
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return (EIO);
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}
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return (0);
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}
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static int
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proto_ioctl(struct cdev *cdev, u_long cmd, caddr_t data, int fflag,
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struct thread *td)
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{
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struct proto_ioc_region *region;
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struct proto_res *r;
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int error;
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r = cdev->si_drv2;
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error = 0;
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switch (cmd) {
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case PROTO_IOC_REGION:
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region = (struct proto_ioc_region *)data;
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region->size = r->r_size;
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if (r->r_type == PROTO_RES_PCICFG)
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region->address = 0;
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else
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region->address = rman_get_start(r->r_res);
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break;
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default:
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error = ENOIOCTL;
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break;
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}
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return (error);
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}
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static int
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proto_mmap(struct cdev *cdev, vm_ooffset_t offset, vm_paddr_t *paddr,
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int prot, vm_memattr_t *memattr)
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{
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struct proto_res *r;
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r = cdev->si_drv2;
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if (r->r_type != SYS_RES_MEMORY)
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return (ENXIO);
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if (offset & PAGE_MASK)
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return (EINVAL);
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if (prot & PROT_EXEC)
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return (EACCES);
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if (offset >= r->r_size)
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return (EINVAL);
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*paddr = rman_get_start(r->r_res) + offset;
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#ifndef __sparc64__
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*memattr = VM_MEMATTR_UNCACHEABLE;
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#endif
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return (0);
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}
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