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/* $OpenBSD: sdmmc_scsi.c,v 1.3 2006/06/01 21:53:41 uwe Exp $ */
/*
* Copyright (c) 2006 Uwe Stuehler <uwe@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* A SCSI bus emulation to access SD/MMC memory cards. */
#include <sys/param.h>
#include <sys/buf.h>
#include <sys/malloc.h>
#include <sys/systm.h>
#include <scsi/scsi_all.h>
#include <scsi/scsi_disk.h>
#include <scsi/scsiconf.h>
#include <dev/sdmmc/sdmmc_scsi.h>
#include <dev/sdmmc/sdmmcvar.h>
#define SDMMC_SCSIID_HOST 0x00
#define SDMMC_SCSIID_MAX 0x0f
int sdmmc_scsi_cmd(struct scsi_xfer *);
int sdmmc_start_xs(struct sdmmc_softc *, struct scsi_xfer *);
int sdmmc_done_xs(struct sdmmc_softc *, struct scsi_xfer *);
void sdmmc_complete(struct sdmmc_softc *, struct scsi_xfer *);
void sdmmc_scsi_minphys(struct buf *);
#ifdef SDMMC_DEBUG
#define DPRINTF(s) printf s
#else
#define DPRINTF(s) /**/
#endif
void
sdmmc_scsi_attach(struct sdmmc_softc *sc)
{
struct sdmmc_scsi_softc *scbus;
struct sdmmc_function *sf;
struct sdmmc_attach_args saa;
MALLOC(scbus, struct sdmmc_scsi_softc *,
sizeof *scbus, M_DEVBUF, M_WAITOK);
bzero(scbus, sizeof *scbus);
MALLOC(scbus->sc_tgt, struct sdmmc_scsi_target *,
sizeof(*scbus->sc_tgt) * (SDMMC_SCSIID_MAX+1),
M_DEVBUF, M_WAITOK);
bzero(scbus->sc_tgt, sizeof(*scbus->sc_tgt) * (SDMMC_SCSIID_MAX+1));
/*
* Each card that sent us a CID in the identification stage
* gets a SCSI ID > 0, whether it is a memory card or not.
*/
scbus->sc_ntargets = 1;
SIMPLEQ_FOREACH(sf, &sc->sf_head, sf_list) {
if (scbus->sc_ntargets >= SDMMC_SCSIID_MAX+1)
break;
scbus->sc_tgt[scbus->sc_ntargets].card = sf;
scbus->sc_ntargets++;
}
sc->sc_scsibus = scbus;
scbus->sc_adapter.scsi_cmd = sdmmc_scsi_cmd;
scbus->sc_adapter.scsi_minphys = sdmmc_scsi_minphys;
scbus->sc_link.adapter_target = SDMMC_SCSIID_HOST;
scbus->sc_link.adapter_buswidth = scbus->sc_ntargets;
scbus->sc_link.adapter_softc = sc;
scbus->sc_link.luns = 1;
scbus->sc_link.openings = 1;
scbus->sc_link.adapter = &scbus->sc_adapter;
bzero(&saa, sizeof saa);
bcopy(&scbus->sc_link, &saa.scsi_link, sizeof saa.scsi_link);
scbus->sc_child = config_found(&sc->sc_dev, &saa, scsiprint);
}
void
sdmmc_scsi_detach(struct sdmmc_softc *sc)
{
struct sdmmc_scsi_softc *scbus;
scbus = sc->sc_scsibus;
if (scbus->sc_child != NULL)
config_detach(scbus->sc_child, DETACH_FORCE);
if (scbus->sc_tgt != NULL)
FREE(scbus->sc_tgt, M_DEVBUF);
FREE(scbus, M_DEVBUF);
sc->sc_scsibus = NULL;
}
int
sdmmc_scsi_cmd(struct scsi_xfer *xs)
{
struct scsi_link *link = xs->sc_link;
struct sdmmc_softc *sc = link->adapter_softc;
struct sdmmc_scsi_softc *scbus = sc->sc_scsibus;
struct sdmmc_scsi_target *tgt = &scbus->sc_tgt[link->target];
struct scsi_inquiry_data inq;
struct scsi_read_cap_data rcd;
if (link->target >= scbus->sc_ntargets || tgt->card == NULL ||
link->lun != 0) {
DPRINTF(("%s: sdmmc_scsi_cmd: no target %d\n",
SDMMCDEVNAME(sc), link->target));
/* XXX should be XS_SENSE and sense filled out */
xs->error = XS_DRIVER_STUFFUP;
xs->flags |= ITSDONE;
scsi_done(xs);
return COMPLETE;
}
DPRINTF(("%s: sdmmc_scsi_cmd: target=%d xs=%p cmd=%#x "
"datalen=%d (poll=%d)\n", SDMMCDEVNAME(sc), link->target,
xs, xs->cmd->opcode, xs->datalen, xs->flags & SCSI_POLL));
xs->error = XS_NOERROR;
switch (xs->cmd->opcode) {
case READ_COMMAND:
case READ_BIG:
case WRITE_COMMAND:
case WRITE_BIG:
/* Deal with I/O outside the switch. */
break;
case INQUIRY:
bzero(&inq, sizeof inq);
inq.device = T_DIRECT;
inq.version = 2;
inq.response_format = 2;
inq.additional_length = 32;
strlcpy(inq.vendor, "SD/MMC ", sizeof(inq.vendor));
snprintf(inq.product, sizeof(inq.product),
"Drive #%02d", link->target);
strlcpy(inq.revision, " ", sizeof(inq.revision));
bcopy(&inq, xs->data, MIN(xs->datalen, sizeof inq));
scsi_done(xs);
return COMPLETE;
case TEST_UNIT_READY:
case START_STOP:
case SYNCHRONIZE_CACHE:
return COMPLETE;
case READ_CAPACITY:
bzero(&rcd, sizeof rcd);
_lto4b(tgt->card->csd.capacity - 1, rcd.addr);
_lto4b(tgt->card->csd.sector_size, rcd.length);
bcopy(&rcd, xs->data, MIN(xs->datalen, sizeof rcd));
scsi_done(xs);
return COMPLETE;
default:
DPRINTF(("%s: unsupported scsi command %#x\n",
SDMMCDEVNAME(sc), xs->cmd->opcode));
xs->error = XS_DRIVER_STUFFUP;
scsi_done(xs);
return COMPLETE;
}
/* XXX check bounds */
return sdmmc_start_xs(sc, xs);
}
int
sdmmc_start_xs(struct sdmmc_softc *sc, struct scsi_xfer *xs)
{
sdmmc_complete(sc, xs);
return COMPLETE;
}
void
sdmmc_complete(struct sdmmc_softc *sc, struct scsi_xfer *xs)
{
struct scsi_link *link = xs->sc_link;
struct sdmmc_scsi_softc *scbus = sc->sc_scsibus;
struct sdmmc_scsi_target *tgt = &scbus->sc_tgt[link->target];
struct scsi_rw *rw;
struct scsi_rw_big *rwb;
u_int32_t blockno;
u_int32_t blockcnt;
int error;
/* A read or write operation. */
/* XXX move to some sort of "scsi emulation layer". */
if (xs->cmdlen == 6) {
rw = (struct scsi_rw *)xs->cmd;
blockno = _3btol(rw->addr) & (SRW_TOPADDR << 16 | 0xffff);
blockcnt = rw->length ? rw->length : 0x100;
} else {
rwb = (struct scsi_rw_big *)xs->cmd;
blockno = _4btol(rwb->addr);
blockcnt = _2btol(rwb->length);
}
if (ISSET(xs->flags, SCSI_DATA_IN))
error = sdmmc_mem_read_block(sc, tgt->card, blockno,
xs->data, blockcnt * DEV_BSIZE);
else
error = sdmmc_mem_write_block(sc, tgt->card, blockno,
xs->data, blockcnt * DEV_BSIZE);
if (error != 0)
xs->error = XS_DRIVER_STUFFUP;
xs->flags |= ITSDONE;
xs->resid = 0;
scsi_done(xs);
}
void
sdmmc_scsi_minphys(struct buf *bp)
{
/* XXX limit to max. transfer size supported by card/host? */
if (bp->b_bcount > DEV_BSIZE)
bp->b_bcount = DEV_BSIZE;
minphys(bp);
}
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