diff options
Diffstat (limited to 'sys/dev/altera/sdcard/altera_sdcard_disk.c')
| -rw-r--r-- | sys/dev/altera/sdcard/altera_sdcard_disk.c | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/sys/dev/altera/sdcard/altera_sdcard_disk.c b/sys/dev/altera/sdcard/altera_sdcard_disk.c new file mode 100644 index 0000000..cae3a82 --- /dev/null +++ b/sys/dev/altera/sdcard/altera_sdcard_disk.c @@ -0,0 +1,185 @@ +/*- + * Copyright (c) 2012 Robert N. M. Watson + * 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. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/bus.h> +#include <sys/condvar.h> +#include <sys/conf.h> +#include <sys/bio.h> +#include <sys/kernel.h> +#include <sys/lock.h> +#include <sys/malloc.h> +#include <sys/module.h> +#include <sys/mutex.h> +#include <sys/rman.h> +#include <sys/systm.h> +#include <sys/taskqueue.h> + +#include <machine/bus.h> +#include <machine/resource.h> + +#include <geom/geom_disk.h> + +#include <dev/altera/sdcard/altera_sdcard.h> + +static int +altera_sdcard_disk_dump(void *arg, void *virtual, vm_offset_t physical, + off_t offset, size_t length) +{ + + panic("%s: not yet", __func__); +} + +static int +altera_sdcard_disk_ioctl(struct disk *disk, u_long cmd, void *data, int fflag, + struct thread *td) +{ + + /* XXXRW: more here? */ + return (EINVAL); +} + +static void +altera_sdcard_disk_strategy(struct bio *bp) +{ + struct altera_sdcard_softc *sc; + + /* + * Although the SD Card doesn't need sorting, we don't want to + * introduce barriers, so use bioq_disksort(). + */ + sc = bp->bio_disk->d_drv1; + ALTERA_SDCARD_LOCK(sc); + switch (sc->as_state) { + case ALTERA_SDCARD_STATE_NOCARD: + device_printf(sc->as_dev, "%s: unexpected I/O on NOCARD", + __func__); + biofinish(bp, NULL, ENXIO); + break; + + case ALTERA_SDCARD_STATE_BADCARD: + device_printf(sc->as_dev, "%s: unexpected I/O on BADCARD", + __func__); + biofinish(bp, NULL, ENXIO); + break; + + case ALTERA_SDCARD_STATE_DETACHED: + device_printf(sc->as_dev, "%s: unexpected I/O on DETACHED", + __func__); + biofinish(bp, NULL, ENXIO); + + case ALTERA_SDCARD_STATE_IDLE: + bioq_disksort(&sc->as_bioq, bp); + altera_sdcard_start(sc); + break; + + case ALTERA_SDCARD_STATE_IO: + bioq_disksort(&sc->as_bioq, bp); + break; + + default: + panic("%s: invalid state %d", __func__, sc->as_state); + } + ALTERA_SDCARD_UNLOCK(sc); +} + +void +altera_sdcard_disk_insert(struct altera_sdcard_softc *sc) +{ + struct disk *disk; + uint64_t size; + + ALTERA_SDCARD_LOCK_ASSERT(sc); + + /* + * Because the disk insertion routine occupies the driver instance's + * task queue thread, and the disk(9) instance isn't hooked up yet by + * definition, the only other source of events of concern is a thread + * initiating driver detach. That thread has to issue a detach + * request and await an ACK from the taskqueue thread. It is + * therefore safe to drop the lock here. + */ + ALTERA_SDCARD_UNLOCK(sc); + disk = disk_alloc(); + disk->d_drv1 = sc; + disk->d_name = "altera_sdcard"; + disk->d_unit = sc->as_unit; + disk->d_strategy = altera_sdcard_disk_strategy; + disk->d_dump = altera_sdcard_disk_dump; + disk->d_ioctl = altera_sdcard_disk_ioctl; + disk->d_sectorsize = ALTERA_SDCARD_SECTORSIZE; + disk->d_mediasize = sc->as_mediasize; + disk->d_maxsize = ALTERA_SDCARD_SECTORSIZE; + sc->as_disk = disk; + disk_create(disk, DISK_VERSION); + ALTERA_SDCARD_LOCK(sc); + + /* + * Print a pretty-ish card insertion string. We could stand to + * decorate this further, e.g., with card vendor information. + */ + size = sc->as_mediasize / (1000 * 1000); + device_printf(sc->as_dev, "%juM SD Card inserted\n", (uintmax_t)size); +} + +void +altera_sdcard_disk_remove(struct altera_sdcard_softc *sc) +{ + struct disk *disk; + + ALTERA_SDCARD_LOCK_ASSERT(sc); + KASSERT(sc->as_disk != NULL, ("%s: as_disk NULL", __func__)); + + /* + * sc->as_state will be updated by the caller. + * + * XXXRW: Is it OK to call disk_destroy() under the mutex, or should + * we be deferring that to the calling context once it is released? + */ + disk = sc->as_disk; + disk_gone(disk); + disk_destroy(disk); + sc->as_disk = NULL; + + /* + * Cancel all outstanding I/O on the SD Card. + */ + if (sc->as_currentbio != NULL) { + device_printf(sc->as_dev, "%s: SD Card removed during I/O", + __func__); + biofinish(sc->as_currentbio, NULL, ENXIO); + sc->as_currentbio = NULL; + } + bioq_flush(&sc->as_bioq, NULL, ENXIO); + device_printf(sc->as_dev, "SD Card removed\n"); +} |
