freebsd-dev/sys/dev/mmc/mmcsd.c
Alexander Motin c18f1e2627 Set of mmc layer improvements:
- add MMC support.
 - add SDHC support.
 - add 4 and 8 bit bus width support.
 - add High Speed bus timing support.
2008-10-08 17:35:41 +00:00

320 lines
9.0 KiB
C

/*-
* Copyright (c) 2006 Bernd Walter. All rights reserved.
* Copyright (c) 2006 M. Warner Losh. 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 THE AUTHOR ``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 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.
*
* Portions of this software may have been developed with reference to
* the SD Simplified Specification. The following disclaimer may apply:
*
* The following conditions apply to the release of the simplified
* specification ("Simplified Specification") by the SD Card Association and
* the SD Group. The Simplified Specification is a subset of the complete SD
* Specification which is owned by the SD Card Association and the SD
* Group. This Simplified Specification is provided on a non-confidential
* basis subject to the disclaimers below. Any implementation of the
* Simplified Specification may require a license from the SD Card
* Association, SD Group, SD-3C LLC or other third parties.
*
* Disclaimers:
*
* The information contained in the Simplified Specification is presented only
* as a standard specification for SD Cards and SD Host/Ancillary products and
* is provided "AS-IS" without any representations or warranties of any
* kind. No responsibility is assumed by the SD Group, SD-3C LLC or the SD
* Card Association for any damages, any infringements of patents or other
* right of the SD Group, SD-3C LLC, the SD Card Association or any third
* parties, which may result from its use. No license is granted by
* implication, estoppel or otherwise under any patent or other rights of the
* SD Group, SD-3C LLC, the SD Card Association or any third party. Nothing
* herein shall be construed as an obligation by the SD Group, the SD-3C LLC
* or the SD Card Association to disclose or distribute any technical
* information, know-how or other confidential information to any third party.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bio.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/kthread.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <geom/geom_disk.h>
#include <dev/mmc/mmcvar.h>
#include <dev/mmc/mmcreg.h>
#include "mmcbus_if.h"
struct mmcsd_softc {
device_t dev;
struct mtx sc_mtx;
struct disk *disk;
struct proc *p;
struct bio_queue_head bio_queue;
int running;
};
#define MULTI_BLOCK_BROKEN
/* bus entry points */
static int mmcsd_probe(device_t dev);
static int mmcsd_attach(device_t dev);
static int mmcsd_detach(device_t dev);
/* disk routines */
static int mmcsd_open(struct disk *dp);
static int mmcsd_close(struct disk *dp);
static void mmcsd_strategy(struct bio *bp);
static void mmcsd_task(void *arg);
#define MMCSD_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx)
#define MMCSD_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx)
#define MMCSD_LOCK_INIT(_sc) \
mtx_init(&_sc->sc_mtx, device_get_nameunit(_sc->dev), \
"mmcsd", MTX_DEF)
#define MMCSD_LOCK_DESTROY(_sc) mtx_destroy(&_sc->sc_mtx);
#define MMCSD_ASSERT_LOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_OWNED);
#define MMCSD_ASSERT_UNLOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_NOTOWNED);
static int
mmcsd_probe(device_t dev)
{
device_quiet(dev);
device_set_desc(dev, "MMC/SD Memory Card");
return (0);
}
static int
mmcsd_attach(device_t dev)
{
struct mmcsd_softc *sc;
sc = device_get_softc(dev);
sc->dev = dev;
MMCSD_LOCK_INIT(sc);
sc->disk = disk_alloc();
sc->disk->d_open = mmcsd_open;
sc->disk->d_close = mmcsd_close;
sc->disk->d_strategy = mmcsd_strategy;
// sc->disk->d_dump = mmcsd_dump; Need polling mmc layer
sc->disk->d_name = "mmcsd";
sc->disk->d_drv1 = sc;
sc->disk->d_maxsize = MAXPHYS; /* Maybe ask bridge? */
sc->disk->d_sectorsize = mmc_get_sector_size(dev);
sc->disk->d_mediasize = mmc_get_media_size(dev) *
mmc_get_sector_size(dev);
sc->disk->d_unit = device_get_unit(dev);
device_printf(dev, "%juMB <MMC/SD Memory Card>%s at %s\n",
sc->disk->d_mediasize / 1048576,
mmc_get_read_only(dev)?" (read-only)":"",
device_get_nameunit(device_get_parent(sc->dev)));
disk_create(sc->disk, DISK_VERSION);
bioq_init(&sc->bio_queue);
sc->running = 1;
kproc_create(&mmcsd_task, sc, &sc->p, 0, 0, "task: mmc/sd card");
return (0);
}
static int
mmcsd_detach(device_t dev)
{
struct mmcsd_softc *sc = device_get_softc(dev);
/* kill thread */
MMCSD_LOCK(sc);
sc->running = 0;
wakeup(sc);
MMCSD_UNLOCK(sc);
/* wait for thread to finish. XXX probably want timeout. -sorbo */
MMCSD_LOCK(sc);
while (sc->running != -1)
msleep(sc, &sc->sc_mtx, PRIBIO, "detach", 0);
MMCSD_UNLOCK(sc);
/* kill disk */
disk_destroy(sc->disk);
/* XXX destroy anything in queue */
MMCSD_LOCK_DESTROY(sc);
return (0);
}
static int
mmcsd_open(struct disk *dp)
{
return (0);
}
static int
mmcsd_close(struct disk *dp)
{
return (0);
}
static void
mmcsd_strategy(struct bio *bp)
{
struct mmcsd_softc *sc;
sc = (struct mmcsd_softc *)bp->bio_disk->d_drv1;
MMCSD_LOCK(sc);
bioq_disksort(&sc->bio_queue, bp);
wakeup(sc);
MMCSD_UNLOCK(sc);
}
static void
mmcsd_task(void *arg)
{
struct mmcsd_softc *sc = (struct mmcsd_softc*)arg;
struct bio *bp;
int sz;
daddr_t block, end;
struct mmc_command cmd;
struct mmc_command stop;
struct mmc_request req;
struct mmc_data data;
device_t dev;
dev = sc->dev;
while (sc->running) {
MMCSD_LOCK(sc);
do {
bp = bioq_first(&sc->bio_queue);
if (bp == NULL)
msleep(sc, &sc->sc_mtx, PRIBIO, "jobqueue", 0);
} while (bp == NULL && sc->running);
if (bp)
bioq_remove(&sc->bio_queue, bp);
MMCSD_UNLOCK(sc);
if (!sc->running)
break;
// printf("mmc_task: request %p for block %ju\n", bp, bp->bio_pblkno);
if (bp->bio_cmd != BIO_READ && mmc_get_read_only(dev)) {
bp->bio_error = EROFS;
bp->bio_resid = bp->bio_bcount;
bp->bio_flags |= BIO_ERROR;
biodone(bp);
continue;
}
MMCBUS_ACQUIRE_BUS(device_get_parent(dev), dev);
sz = sc->disk->d_sectorsize;
end = bp->bio_pblkno + (bp->bio_bcount / sz);
for (block = bp->bio_pblkno; block < end;) {
char *vaddr = bp->bio_data + (block - bp->bio_pblkno) * sz;
int numblocks;
#ifdef MULTI_BLOCK
numblocks = end - block;
#else
numblocks = 1;
#endif
memset(&req, 0, sizeof(req));
memset(&cmd, 0, sizeof(cmd));
memset(&stop, 0, sizeof(stop));
req.cmd = &cmd;
cmd.data = &data;
if (bp->bio_cmd == BIO_READ) {
if (numblocks > 1)
cmd.opcode = MMC_READ_MULTIPLE_BLOCK;
else
cmd.opcode = MMC_READ_SINGLE_BLOCK;
} else {
if (numblocks > 1)
cmd.opcode = MMC_WRITE_MULTIPLE_BLOCK;
else
cmd.opcode = MMC_WRITE_BLOCK;
}
cmd.arg = block;
if (!mmc_get_high_cap(dev))
cmd.arg <<= 9;
cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
data.data = vaddr;
data.mrq = &req;
if (bp->bio_cmd == BIO_READ)
data.flags = MMC_DATA_READ;
else
data.flags = MMC_DATA_WRITE;
data.len = numblocks * sz;
if (numblocks > 1) {
data.flags |= MMC_DATA_MULTI;
stop.opcode = MMC_STOP_TRANSMISSION;
stop.arg = 0;
stop.flags = MMC_RSP_R1B | MMC_CMD_AC;
req.stop = &stop;
}
// printf("Len %d %lld-%lld flags %#x sz %d\n",
// (int)data.len, (long long)block, (long long)end, data.flags, sz);
MMCBUS_WAIT_FOR_REQUEST(device_get_parent(dev), dev,
&req);
if (req.cmd->error != MMC_ERR_NONE)
break;
block += numblocks;
}
MMCBUS_RELEASE_BUS(device_get_parent(dev), dev);
if (block < end) {
bp->bio_error = EIO;
bp->bio_resid = (end - block) * sz;
bp->bio_flags |= BIO_ERROR;
}
biodone(bp);
}
/* tell parent we're done */
MMCSD_LOCK(sc);
sc->running = -1;
wakeup(sc);
MMCSD_UNLOCK(sc);
kproc_exit(0);
}
static device_method_t mmcsd_methods[] = {
DEVMETHOD(device_probe, mmcsd_probe),
DEVMETHOD(device_attach, mmcsd_attach),
DEVMETHOD(device_detach, mmcsd_detach),
{0, 0},
};
static driver_t mmcsd_driver = {
"mmcsd",
mmcsd_methods,
sizeof(struct mmcsd_softc),
};
static devclass_t mmcsd_devclass;
DRIVER_MODULE(mmcsd, mmc, mmcsd_driver, mmcsd_devclass, 0, 0);