diff options
| -rw-r--r-- | sys/dev/ofw/ofw_disk.c | 261 |
1 files changed, 261 insertions, 0 deletions
diff --git a/sys/dev/ofw/ofw_disk.c b/sys/dev/ofw/ofw_disk.c new file mode 100644 index 0000000..878e8e8 --- /dev/null +++ b/sys/dev/ofw/ofw_disk.c @@ -0,0 +1,261 @@ +/* + * Copyright (C) 2002 Benno Rice <benno@FreeBSD.org> + * All rights reserved. + * + * 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 Benno Rice ``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 TOOLS GMBH 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. + * + * $FreeBSD$ + * + */ + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/bio.h> +#include <sys/bus.h> +#include <sys/conf.h> +#include <sys/disk.h> +#include <sys/kernel.h> + +#include <dev/ofw/openfirm.h> + +#include <machine/bus.h> +#include <machine/md_var.h> +#include <machine/nexusvar.h> + +#define OFWD_BLOCKSIZE 512 + +struct ofwd_softc +{ + device_t ofwd_dev; + dev_t ofwd_dev_t; + struct disk ofwd_disk; + phandle_t ofwd_package; + ihandle_t ofwd_instance; + u_int ofwd_flags; +#define OFWD_OPEN (1<<0) +}; + +/* + * Disk device bus interface. + */ +static void ofwd_identify(driver_t *, device_t); +static int ofwd_probe(device_t); +static int ofwd_attach(device_t); + +static device_method_t ofwd_methods[] = { + DEVMETHOD(device_identify, ofwd_identify), + DEVMETHOD(device_probe, ofwd_probe), + DEVMETHOD(device_attach, ofwd_attach), + { 0, 0 } +}; + +static driver_t ofwd_driver = { + "ofwd", + ofwd_methods, + sizeof(struct ofwd_softc) +}; + +static devclass_t ofwd_devclass; + +DRIVER_MODULE(ofwd, nexus, ofwd_driver, ofwd_devclass, 0, 0); + +/* + * Disk device control interface. + */ +static d_open_t ofwd_open; +static d_close_t ofwd_close; +static d_strategy_t ofwd_strategy; + +#define OFWD_CDEV_MAJOR 169 + +static struct cdevsw ofwd_cdevsw = { + ofwd_open, + ofwd_close, + physread, + physwrite, + noioctl, + nopoll, + nommap, + ofwd_strategy, + "ofwd", + OFWD_CDEV_MAJOR, + nodump, + nopsize, + D_DISK +}; + +static struct cdevsw ofwddisk_cdevsw; + +/* + * Handle open from generic layer. + * + * This is typically only called by the diskslice code and not for opens on + * subdevices. + */ +static int +ofwd_open(dev_t dev, int flags, int fmt, struct thread *td) +{ + struct ofwd_softc *sc; + struct disklabel *label; + + sc = (struct ofwd_softc *)dev->si_drv1; + if (sc == NULL) + return (ENXIO); + + /* + * Build synthetic label. + */ + label = &sc->ofwd_disk.d_label; + bzero(label, sizeof(*label)); + label->d_type = DTYPE_ESDI; + label->d_secsize = OFWD_BLOCKSIZE; + label->d_nsectors = 33554432; + label->d_ntracks = 1; + label->d_ncylinders = 1024; + label->d_secpercyl = 32768; + label->d_secperunit = 33554432; + + sc->ofwd_flags |= OFWD_OPEN; + return (0); +} + +/* + * Handle last close of the disk device. + */ +static int +ofwd_close(dev_t dev, int flags, int fmt, struct thread *td) +{ + struct ofwd_softc *sc; + + sc = (struct ofwd_softc *)dev->si_drv1; + + if (sc == NULL) + return (ENXIO); + + sc->ofwd_flags &= ~OFWD_OPEN; + + return (0); +} + +/* + * Handle an I/O request. + */ +static void +ofwd_strategy(struct bio *bp) +{ + struct ofwd_softc *sc; + long r; + + sc = (struct ofwd_softc *)bp->bio_dev->si_drv1; + + if (sc == NULL) { + bp->bio_error = EINVAL; + bp->bio_flags |= BIO_ERROR; + printf("ofwd: bio for invalid disk!\n"); + biodone(bp); + return; + } + + r = OF_seek(sc->ofwd_instance, + (u_quad_t)(bp->bio_blkno * OFWD_BLOCKSIZE)); + if (r == -1) { + bp->bio_resid = bp->bio_bcount; + bp->bio_error = EIO; + bp->bio_flags |= BIO_ERROR; + device_printf(sc->ofwd_dev, "seek failed\n"); + biodone(bp); + return; + } + + if (bp->bio_cmd == BIO_READ) { + r = OF_read(sc->ofwd_instance, (void *)bp->bio_data, + bp->bio_bcount); + } else { + r = OF_write(sc->ofwd_instance, (void *)bp->bio_data, + bp->bio_bcount); + } + + if (r < bp->bio_bcount) { + device_printf(sc->ofwd_dev, "r (%ld) < bp->bio_bcount (%ld)\n", + r, bp->bio_bcount); + if (r != -1) + bp->bio_resid = bp->bio_bcount - r; + bp->bio_error = EIO; + bp->bio_flags |= BIO_ERROR; + } else if (r > bp->bio_bcount) + panic("ofwd: more bytes read/written than requested"); + + bp->bio_resid -= r; + biodone(bp); + + return; +} + +/* + * Probe for an OpenFirmware disk. + */ +static int +ofwd_probe(device_t dev) +{ + char *type; + + type = nexus_get_device_type(dev); + + if (type == NULL || strcmp(type, "disk") != 0) + return (ENXIO); + + device_set_desc(dev, "OpenFirmware disk"); + return (0); +} + +static int +ofwd_attach(device_t dev) +{ + struct ofwd_softc *sc; + char path[128]; + dev_t dsk; + + sc = device_get_softc(dev); + sc->ofwd_dev = dev; + + bzero(path, 128); + OF_package_to_path(nexus_get_node(dev), path, 128); + device_printf(dev, "located at %s\n", path); + sc->ofwd_instance = OF_open(path); + if (sc->ofwd_instance == -1) { + device_printf(dev, "could not create instance\n"); + return (ENXIO); + } + + dsk = disk_create(device_get_unit(dev), &sc->ofwd_disk, 0, + &ofwd_cdevsw, &ofwddisk_cdevsw); + dsk->si_drv1 = sc; + sc->ofwd_dev_t = dsk; + + dsk->si_iosize_max = PAGE_SIZE; + + return (0); +} + +static void +ofwd_identify(driver_t *driver, device_t parent) +{ +} |
