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freebsd-skq/sys/dev/mmc/mmc.c
marius 19310c915c - If available, use TRIM instead of ERASE for implementing BIO_DELETE. 
This also involves adding a quirk table as TRIM is broken for some
  Kingston eMMC devices, though. Compared to ERASE (declared "legacy"
  in the eMMC specification v5.1), TRIM has the advantage of operating
  on write sectors rather than on erase sectors, which typically are
  of a much larger size. Thus, employing TRIM, we don't need to fiddle
  with coalescing BIO_DELETE requests that are also of (write) sector
  units into erase sectors, which might not even add up in all cases.
- For some SanDisk iNAND devices, the CMD38 argument, e. g. ERASE,
  TRIM etc., has to be specified via EXT_CSD[113], which now is also
  handled via a quirk.
- My initial understanding was that for eMMC partitions, the granularity
  should be used as erase sector size, e. g. 128 KB for boot partitions.
  However, rereading the relevant parts of the eMMC specification v5.1,
  this isn't actually correct. So drop the code which used partition
  granularities for delmaxsize and stripesize. For the most part, this
  change is a NOP, though, because a) for ERASE, mmcsd_delete() used
  the erase sector size unconditionally for all partitions anyway and
  b) g_disk_limit() doesn't actually take the stripesize into account.
- Take some more advantage of mmcsd_errmsg() in mmcsd(4) for making
  error codes human readable.
2017-08-07 23:33:05 +00:00

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/*-
* Copyright (c) 2006 Bernd Walter. All rights reserved.
* Copyright (c) 2006 M. Warner Losh. All rights reserved.
* Copyright (c) 2017 Marius Strobl <marius@FreeBSD.org>
*
* 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/kernel.h>
#include <sys/malloc.h>
#include <sys/lock.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/bus.h>
#include <sys/endian.h>
#include <sys/sysctl.h>
#include <sys/time.h>
#include <dev/mmc/bridge.h>
#include <dev/mmc/mmc_private.h>
#include <dev/mmc/mmc_subr.h>
#include <dev/mmc/mmcreg.h>
#include <dev/mmc/mmcbrvar.h>
#include <dev/mmc/mmcvar.h>
#include "mmcbr_if.h"
#include "mmcbus_if.h"
CTASSERT(bus_timing_max <= sizeof(uint32_t) * NBBY);
/*
* Per-card data
*/
struct mmc_ivars {
uint32_t raw_cid[4]; /* Raw bits of the CID */
uint32_t raw_csd[4]; /* Raw bits of the CSD */
uint32_t raw_scr[2]; /* Raw bits of the SCR */
uint8_t raw_ext_csd[MMC_EXTCSD_SIZE]; /* Raw bits of the EXT_CSD */
uint32_t raw_sd_status[16]; /* Raw bits of the SD_STATUS */
uint16_t rca;
u_char read_only; /* True when the device is read-only */
u_char high_cap; /* High Capacity device (block addressed) */
enum mmc_card_mode mode;
enum mmc_bus_width bus_width; /* Bus width to use */
struct mmc_cid cid; /* cid decoded */
struct mmc_csd csd; /* csd decoded */
struct mmc_scr scr; /* scr decoded */
struct mmc_sd_status sd_status; /* SD_STATUS decoded */
uint32_t sec_count; /* Card capacity in 512byte blocks */
uint32_t timings; /* Mask of bus timings supported */
uint32_t vccq_120; /* Mask of bus timings at VCCQ of 1.2 V */
uint32_t vccq_180; /* Mask of bus timings at VCCQ of 1.8 V */
uint32_t tran_speed; /* Max speed in normal mode */
uint32_t hs_tran_speed; /* Max speed in high speed mode */
uint32_t erase_sector; /* Card native erase sector size */
uint32_t cmd6_time; /* Generic switch timeout [us] */
uint32_t quirks; /* Quirks as per mmc_quirk->quirks */
char card_id_string[64];/* Formatted CID info (serial, MFG, etc) */
char card_sn_string[16];/* Formatted serial # for disk->d_ident */
};
#define CMD_RETRIES 3
static const struct mmc_quirk mmc_quirks[] = {
/*
* For some SanDisk iNAND devices, the CMD38 argument needs to be
* provided in EXT_CSD[113].
*/
{ 0x2, 0x100, "SEM02G", MMC_QUIRK_INAND_CMD38 },
{ 0x2, 0x100, "SEM04G", MMC_QUIRK_INAND_CMD38 },
{ 0x2, 0x100, "SEM08G", MMC_QUIRK_INAND_CMD38 },
{ 0x2, 0x100, "SEM16G", MMC_QUIRK_INAND_CMD38 },
{ 0x2, 0x100, "SEM32G", MMC_QUIRK_INAND_CMD38 },
/*
* Disable TRIM for Kingston eMMCs where a firmware bug can lead to
* unrecoverable data corruption.
*/
{ 0x70, MMC_QUIRK_OID_ANY, "V10008", MMC_QUIRK_BROKEN_TRIM },
{ 0x70, MMC_QUIRK_OID_ANY, "V10016", MMC_QUIRK_BROKEN_TRIM },
{ 0x0, 0x0, NULL, 0x0 }
};
static SYSCTL_NODE(_hw, OID_AUTO, mmc, CTLFLAG_RD, NULL, "mmc driver");
static int mmc_debug;
SYSCTL_INT(_hw_mmc, OID_AUTO, debug, CTLFLAG_RWTUN, &mmc_debug, 0,
"Debug level");
/* bus entry points */
static int mmc_acquire_bus(device_t busdev, device_t dev);
static int mmc_attach(device_t dev);
static int mmc_child_location_str(device_t dev, device_t child, char *buf,
size_t buflen);
static int mmc_detach(device_t dev);
static int mmc_probe(device_t dev);
static int mmc_read_ivar(device_t bus, device_t child, int which,
uintptr_t *result);
static int mmc_release_bus(device_t busdev, device_t dev);
static int mmc_resume(device_t dev);
static void mmc_retune_pause(device_t busdev, device_t dev, bool retune);
static void mmc_retune_unpause(device_t busdev, device_t dev);
static int mmc_suspend(device_t dev);
static int mmc_wait_for_request(device_t busdev, device_t dev,
struct mmc_request *req);
static int mmc_write_ivar(device_t bus, device_t child, int which,
uintptr_t value);
#define MMC_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx)
#define MMC_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx)
#define MMC_LOCK_INIT(_sc) \
mtx_init(&(_sc)->sc_mtx, device_get_nameunit((_sc)->dev), \
"mmc", MTX_DEF)
#define MMC_LOCK_DESTROY(_sc) mtx_destroy(&(_sc)->sc_mtx);
#define MMC_ASSERT_LOCKED(_sc) mtx_assert(&(_sc)->sc_mtx, MA_OWNED);
#define MMC_ASSERT_UNLOCKED(_sc) mtx_assert(&(_sc)->sc_mtx, MA_NOTOWNED);
static int mmc_all_send_cid(struct mmc_softc *sc, uint32_t *rawcid);
static void mmc_app_decode_scr(uint32_t *raw_scr, struct mmc_scr *scr);
static void mmc_app_decode_sd_status(uint32_t *raw_sd_status,
struct mmc_sd_status *sd_status);
static int mmc_app_sd_status(struct mmc_softc *sc, uint16_t rca,
uint32_t *rawsdstatus);
static int mmc_app_send_scr(struct mmc_softc *sc, uint16_t rca,
uint32_t *rawscr);
static int mmc_calculate_clock(struct mmc_softc *sc);
static void mmc_decode_cid_mmc(uint32_t *raw_cid, struct mmc_cid *cid,
bool is_4_41p);
static void mmc_decode_cid_sd(uint32_t *raw_cid, struct mmc_cid *cid);
static void mmc_decode_csd_mmc(uint32_t *raw_csd, struct mmc_csd *csd);
static int mmc_decode_csd_sd(uint32_t *raw_csd, struct mmc_csd *csd);
static void mmc_delayed_attach(void *xsc);
static int mmc_delete_cards(struct mmc_softc *sc, bool final);
static void mmc_discover_cards(struct mmc_softc *sc);
static void mmc_format_card_id_string(struct mmc_ivars *ivar);
static void mmc_go_discovery(struct mmc_softc *sc);
static uint32_t mmc_get_bits(uint32_t *bits, int bit_len, int start,
int size);
static int mmc_highest_voltage(uint32_t ocr);
static bool mmc_host_timing(device_t dev, enum mmc_bus_timing timing);
static void mmc_idle_cards(struct mmc_softc *sc);
static void mmc_ms_delay(int ms);
static void mmc_log_card(device_t dev, struct mmc_ivars *ivar, int newcard);
static void mmc_power_down(struct mmc_softc *sc);
static void mmc_power_up(struct mmc_softc *sc);
static void mmc_rescan_cards(struct mmc_softc *sc);
static int mmc_retune(device_t busdev, device_t dev, bool reset);
static void mmc_scan(struct mmc_softc *sc);
static int mmc_sd_switch(struct mmc_softc *sc, uint8_t mode, uint8_t grp,
uint8_t value, uint8_t *res);
static int mmc_select_card(struct mmc_softc *sc, uint16_t rca);
static uint32_t mmc_select_vdd(struct mmc_softc *sc, uint32_t ocr);
static int mmc_send_app_op_cond(struct mmc_softc *sc, uint32_t ocr,
uint32_t *rocr);
static int mmc_send_csd(struct mmc_softc *sc, uint16_t rca, uint32_t *rawcsd);
static int mmc_send_if_cond(struct mmc_softc *sc, uint8_t vhs);
static int mmc_send_op_cond(struct mmc_softc *sc, uint32_t ocr,
uint32_t *rocr);
static int mmc_send_relative_addr(struct mmc_softc *sc, uint32_t *resp);
static int mmc_set_blocklen(struct mmc_softc *sc, uint32_t len);
static int mmc_set_card_bus_width(struct mmc_softc *sc, struct mmc_ivars *ivar,
enum mmc_bus_timing timing);
static int mmc_set_power_class(struct mmc_softc *sc, struct mmc_ivars *ivar);
static int mmc_set_relative_addr(struct mmc_softc *sc, uint16_t resp);
static int mmc_set_timing(struct mmc_softc *sc, struct mmc_ivars *ivar,
enum mmc_bus_timing timing);
static int mmc_set_vccq(struct mmc_softc *sc, struct mmc_ivars *ivar,
enum mmc_bus_timing timing);
static int mmc_switch_to_hs200(struct mmc_softc *sc, struct mmc_ivars *ivar,
uint32_t clock);
static int mmc_switch_to_hs400(struct mmc_softc *sc, struct mmc_ivars *ivar,
uint32_t max_dtr, enum mmc_bus_timing max_timing);
static int mmc_test_bus_width(struct mmc_softc *sc);
static uint32_t mmc_timing_to_dtr(struct mmc_ivars *ivar,
enum mmc_bus_timing timing);
static const char *mmc_timing_to_string(enum mmc_bus_timing timing);
static void mmc_update_child_list(struct mmc_softc *sc);
static int mmc_wait_for_command(struct mmc_softc *sc, uint32_t opcode,
uint32_t arg, uint32_t flags, uint32_t *resp, int retries);
static int mmc_wait_for_req(struct mmc_softc *sc, struct mmc_request *req);
static void mmc_wakeup(struct mmc_request *req);
static void
mmc_ms_delay(int ms)
{
DELAY(1000 * ms); /* XXX BAD */
}
static int
mmc_probe(device_t dev)
{
device_set_desc(dev, "MMC/SD bus");
return (0);
}
static int
mmc_attach(device_t dev)
{
struct mmc_softc *sc;
sc = device_get_softc(dev);
sc->dev = dev;
MMC_LOCK_INIT(sc);
/* We'll probe and attach our children later, but before / mount */
sc->config_intrhook.ich_func = mmc_delayed_attach;
sc->config_intrhook.ich_arg = sc;
if (config_intrhook_establish(&sc->config_intrhook) != 0)
device_printf(dev, "config_intrhook_establish failed\n");
return (0);
}
static int
mmc_detach(device_t dev)
{
struct mmc_softc *sc = device_get_softc(dev);
int err;
err = mmc_delete_cards(sc, true);
if (err != 0)
return (err);
mmc_power_down(sc);
MMC_LOCK_DESTROY(sc);
return (0);
}
static int
mmc_suspend(device_t dev)
{
struct mmc_softc *sc = device_get_softc(dev);
int err;
err = bus_generic_suspend(dev);
if (err != 0)
return (err);
/*
* We power down with the bus acquired here, mainly so that no device
* is selected any longer and sc->last_rca gets set to 0. Otherwise,
* the deselect as part of the bus acquisition in mmc_scan() may fail
* during resume, as the bus isn't powered up again before later in
* mmc_go_discovery().
*/
err = mmc_acquire_bus(dev, dev);
if (err != 0)
return (err);
mmc_power_down(sc);
err = mmc_release_bus(dev, dev);
return (err);
}
static int
mmc_resume(device_t dev)
{
struct mmc_softc *sc = device_get_softc(dev);
mmc_scan(sc);
return (bus_generic_resume(dev));
}
static int
mmc_acquire_bus(device_t busdev, device_t dev)
{
struct mmc_softc *sc;
struct mmc_ivars *ivar;
int err;
uint16_t rca;
enum mmc_bus_timing timing;
err = MMCBR_ACQUIRE_HOST(device_get_parent(busdev), busdev);
if (err)
return (err);
sc = device_get_softc(busdev);
MMC_LOCK(sc);
if (sc->owner)
panic("mmc: host bridge didn't serialize us.");
sc->owner = dev;
MMC_UNLOCK(sc);
if (busdev != dev) {
/*
* Keep track of the last rca that we've selected. If
* we're asked to do it again, don't. We never
* unselect unless the bus code itself wants the mmc
* bus, and constantly reselecting causes problems.
*/
ivar = device_get_ivars(dev);
rca = ivar->rca;
if (sc->last_rca != rca) {
if (mmc_select_card(sc, rca) != MMC_ERR_NONE) {
device_printf(busdev, "Card at relative "
"address %d failed to select\n", rca);
return (ENXIO);
}
sc->last_rca = rca;
timing = mmcbr_get_timing(busdev);
/*
* For eMMC modes, setting/updating bus width and VCCQ
* only really is necessary if there actually is more
* than one device on the bus as generally that already
* had to be done by mmc_calculate_clock() or one of
* its calees. Moreover, setting the bus width anew
* can trigger re-tuning (via a CRC error on the next
* CMD), even if not switching between devices an the
* previously selected one is still tuned. Obviously,
* we need to re-tune the host controller if devices
* are actually switched, though.
*/
if (timing >= bus_timing_mmc_ddr52 &&
sc->child_count == 1)
return (0);
/* Prepare bus width for the new card. */
if (bootverbose || mmc_debug) {
device_printf(busdev,
"setting bus width to %d bits %s timing\n",
(ivar->bus_width == bus_width_4) ? 4 :
(ivar->bus_width == bus_width_8) ? 8 : 1,
mmc_timing_to_string(timing));
}
if (mmc_set_card_bus_width(sc, ivar, timing) !=
MMC_ERR_NONE) {
device_printf(busdev, "Card at relative "
"address %d failed to set bus width\n",
rca);
return (ENXIO);
}
mmcbr_set_bus_width(busdev, ivar->bus_width);
mmcbr_update_ios(busdev);
if (mmc_set_vccq(sc, ivar, timing) != MMC_ERR_NONE) {
device_printf(busdev, "Failed to set VCCQ "
"for card at relative address %d\n", rca);
return (ENXIO);
}
if (timing >= bus_timing_mmc_hs200 &&
mmc_retune(busdev, dev, true) != 0) {
device_printf(busdev, "Card at relative "
"address %d failed to re-tune\n", rca);
return (ENXIO);
}
}
} else {
/*
* If there's a card selected, stand down.
*/
if (sc->last_rca != 0) {
if (mmc_select_card(sc, 0) != MMC_ERR_NONE)
return (ENXIO);
sc->last_rca = 0;
}
}
return (0);
}
static int
mmc_release_bus(device_t busdev, device_t dev)
{
struct mmc_softc *sc;
int err;
sc = device_get_softc(busdev);
MMC_LOCK(sc);
if (!sc->owner)
panic("mmc: releasing unowned bus.");
if (sc->owner != dev)
panic("mmc: you don't own the bus. game over.");
MMC_UNLOCK(sc);
err = MMCBR_RELEASE_HOST(device_get_parent(busdev), busdev);
if (err)
return (err);
MMC_LOCK(sc);
sc->owner = NULL;
MMC_UNLOCK(sc);
return (0);
}
static uint32_t
mmc_select_vdd(struct mmc_softc *sc, uint32_t ocr)
{
return (ocr & MMC_OCR_VOLTAGE);
}
static int
mmc_highest_voltage(uint32_t ocr)
{
int i;
for (i = MMC_OCR_MAX_VOLTAGE_SHIFT;
i >= MMC_OCR_MIN_VOLTAGE_SHIFT; i--)
if (ocr & (1 << i))
return (i);
return (-1);
}
static void
mmc_wakeup(struct mmc_request *req)
{
struct mmc_softc *sc;
sc = (struct mmc_softc *)req->done_data;
MMC_LOCK(sc);
req->flags |= MMC_REQ_DONE;
MMC_UNLOCK(sc);
wakeup(req);
}
static int
mmc_wait_for_req(struct mmc_softc *sc, struct mmc_request *req)
{
req->done = mmc_wakeup;
req->done_data = sc;
if (__predict_false(mmc_debug > 1)) {
device_printf(sc->dev, "REQUEST: CMD%d arg %#x flags %#x",
req->cmd->opcode, req->cmd->arg, req->cmd->flags);
if (req->cmd->data) {
printf(" data %d\n", (int)req->cmd->data->len);
} else
printf("\n");
}
MMCBR_REQUEST(device_get_parent(sc->dev), sc->dev, req);
MMC_LOCK(sc);
while ((req->flags & MMC_REQ_DONE) == 0)
msleep(req, &sc->sc_mtx, 0, "mmcreq", 0);
MMC_UNLOCK(sc);
if (__predict_false(mmc_debug > 2 || (mmc_debug > 0 &&
req->cmd->error != MMC_ERR_NONE)))
device_printf(sc->dev, "CMD%d RESULT: %d\n",
req->cmd->opcode, req->cmd->error);
return (0);
}
static int
mmc_wait_for_request(device_t busdev, device_t dev, struct mmc_request *req)
{
struct mmc_softc *sc;
struct mmc_ivars *ivar;
int err, i;
enum mmc_retune_req retune_req;
sc = device_get_softc(busdev);
KASSERT(sc->owner != NULL,
("%s: Request from %s without bus being acquired.", __func__,
device_get_nameunit(dev)));
/*
* Unless no device is selected or re-tuning is already ongoing,
* execute re-tuning if a) the bridge is requesting to do so and
* re-tuning hasn't been otherwise paused, or b) if a child asked
* to be re-tuned prior to pausing (see also mmc_retune_pause()).
*/
if (__predict_false(sc->last_rca != 0 && sc->retune_ongoing == 0 &&
(((retune_req = mmcbr_get_retune_req(busdev)) != retune_req_none &&
sc->retune_paused == 0) || sc->retune_needed == 1))) {
if (__predict_false(mmc_debug > 1)) {
device_printf(busdev,
"Re-tuning with%s circuit reset required\n",
retune_req == retune_req_reset ? "" : "out");
}
if (device_get_parent(dev) == busdev)
ivar = device_get_ivars(dev);
else {
for (i = 0; i < sc->child_count; i++) {
ivar = device_get_ivars(sc->child_list[i]);
if (ivar->rca == sc->last_rca)
break;
}
if (ivar->rca != sc->last_rca)
return (EINVAL);
}
sc->retune_ongoing = 1;
err = mmc_retune(busdev, dev, retune_req == retune_req_reset);
sc->retune_ongoing = 0;
switch (err) {
case MMC_ERR_NONE:
case MMC_ERR_FAILED: /* Re-tune error but still might work */
break;
case MMC_ERR_BADCRC: /* Switch failure on HS400 recovery */
return (ENXIO);
case MMC_ERR_INVALID: /* Driver implementation b0rken */
default: /* Unknown error, should not happen */
return (EINVAL);
}
sc->retune_needed = 0;
}
return (mmc_wait_for_req(sc, req));
}
static int
mmc_wait_for_command(struct mmc_softc *sc, uint32_t opcode,
uint32_t arg, uint32_t flags, uint32_t *resp, int retries)
{
struct mmc_command cmd;
int err;
memset(&cmd, 0, sizeof(cmd));
cmd.opcode = opcode;
cmd.arg = arg;
cmd.flags = flags;
cmd.data = NULL;
err = mmc_wait_for_cmd(sc->dev, sc->dev, &cmd, retries);
if (err)
return (err);
if (resp) {
if (flags & MMC_RSP_136)
memcpy(resp, cmd.resp, 4 * sizeof(uint32_t));
else
*resp = cmd.resp[0];
}
return (0);
}
static void
mmc_idle_cards(struct mmc_softc *sc)
{
device_t dev;
struct mmc_command cmd;
dev = sc->dev;
mmcbr_set_chip_select(dev, cs_high);
mmcbr_update_ios(dev);
mmc_ms_delay(1);
memset(&cmd, 0, sizeof(cmd));
cmd.opcode = MMC_GO_IDLE_STATE;
cmd.arg = 0;
cmd.flags = MMC_RSP_NONE | MMC_CMD_BC;
cmd.data = NULL;
mmc_wait_for_cmd(sc->dev, sc->dev, &cmd, CMD_RETRIES);
mmc_ms_delay(1);
mmcbr_set_chip_select(dev, cs_dontcare);
mmcbr_update_ios(dev);
mmc_ms_delay(1);
}
static int
mmc_send_app_op_cond(struct mmc_softc *sc, uint32_t ocr, uint32_t *rocr)
{
struct mmc_command cmd;
int err = MMC_ERR_NONE, i;
memset(&cmd, 0, sizeof(cmd));
cmd.opcode = ACMD_SD_SEND_OP_COND;
cmd.arg = ocr;
cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR;
cmd.data = NULL;
for (i = 0; i < 1000; i++) {
err = mmc_wait_for_app_cmd(sc->dev, sc->dev, 0, &cmd,
CMD_RETRIES);
if (err != MMC_ERR_NONE)
break;
if ((cmd.resp[0] & MMC_OCR_CARD_BUSY) ||
(ocr & MMC_OCR_VOLTAGE) == 0)
break;
err = MMC_ERR_TIMEOUT;
mmc_ms_delay(10);
}
if (rocr && err == MMC_ERR_NONE)
*rocr = cmd.resp[0];
return (err);
}
static int
mmc_send_op_cond(struct mmc_softc *sc, uint32_t ocr, uint32_t *rocr)
{
struct mmc_command cmd;
int err = MMC_ERR_NONE, i;
memset(&cmd, 0, sizeof(cmd));
cmd.opcode = MMC_SEND_OP_COND;
cmd.arg = ocr;
cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR;
cmd.data = NULL;
for (i = 0; i < 1000; i++) {
err = mmc_wait_for_cmd(sc->dev, sc->dev, &cmd, CMD_RETRIES);
if (err != MMC_ERR_NONE)
break;
if ((cmd.resp[0] & MMC_OCR_CARD_BUSY) ||
(ocr & MMC_OCR_VOLTAGE) == 0)
break;
err = MMC_ERR_TIMEOUT;
mmc_ms_delay(10);
}
if (rocr && err == MMC_ERR_NONE)
*rocr = cmd.resp[0];
return (err);
}
static int
mmc_send_if_cond(struct mmc_softc *sc, uint8_t vhs)
{
struct mmc_command cmd;
int err;
memset(&cmd, 0, sizeof(cmd));
cmd.opcode = SD_SEND_IF_COND;
cmd.arg = (vhs << 8) + 0xAA;
cmd.flags = MMC_RSP_R7 | MMC_CMD_BCR;
cmd.data = NULL;
err = mmc_wait_for_cmd(sc->dev, sc->dev, &cmd, CMD_RETRIES);
return (err);
}
static void
mmc_power_up(struct mmc_softc *sc)
{
device_t dev;
enum mmc_vccq vccq;
dev = sc->dev;
mmcbr_set_vdd(dev, mmc_highest_voltage(mmcbr_get_host_ocr(dev)));
mmcbr_set_bus_mode(dev, opendrain);
mmcbr_set_chip_select(dev, cs_dontcare);
mmcbr_set_bus_width(dev, bus_width_1);
mmcbr_set_power_mode(dev, power_up);
mmcbr_set_clock(dev, 0);
mmcbr_update_ios(dev);
for (vccq = vccq_330; ; vccq--) {
mmcbr_set_vccq(dev, vccq);
if (mmcbr_switch_vccq(dev) == 0 || vccq == vccq_120)
break;
}
mmc_ms_delay(1);
mmcbr_set_clock(dev, SD_MMC_CARD_ID_FREQUENCY);
mmcbr_set_timing(dev, bus_timing_normal);
mmcbr_set_power_mode(dev, power_on);
mmcbr_update_ios(dev);
mmc_ms_delay(2);
}
static void
mmc_power_down(struct mmc_softc *sc)
{
device_t dev = sc->dev;
mmcbr_set_bus_mode(dev, opendrain);
mmcbr_set_chip_select(dev, cs_dontcare);
mmcbr_set_bus_width(dev, bus_width_1);
mmcbr_set_power_mode(dev, power_off);
mmcbr_set_clock(dev, 0);
mmcbr_set_timing(dev, bus_timing_normal);
mmcbr_update_ios(dev);
}
static int
mmc_select_card(struct mmc_softc *sc, uint16_t rca)
{
int err, flags;
flags = (rca ? MMC_RSP_R1B : MMC_RSP_NONE) | MMC_CMD_AC;
sc->retune_paused++;
err = mmc_wait_for_command(sc, MMC_SELECT_CARD, (uint32_t)rca << 16,
flags, NULL, CMD_RETRIES);
sc->retune_paused--;
return (err);
}
static int
mmc_sd_switch(struct mmc_softc *sc, uint8_t mode, uint8_t grp, uint8_t value,
uint8_t *res)
{
int err;
struct mmc_command cmd;
struct mmc_data data;
memset(&cmd, 0, sizeof(cmd));
memset(&data, 0, sizeof(data));
memset(res, 0, 64);
cmd.opcode = SD_SWITCH_FUNC;
cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
cmd.arg = mode << 31; /* 0 - check, 1 - set */
cmd.arg |= 0x00FFFFFF;
cmd.arg &= ~(0xF << (grp * 4));
cmd.arg |= value << (grp * 4);
cmd.data = &data;
data.data = res;
data.len = 64;
data.flags = MMC_DATA_READ;
err = mmc_wait_for_cmd(sc->dev, sc->dev, &cmd, CMD_RETRIES);
return (err);
}
static int
mmc_set_card_bus_width(struct mmc_softc *sc, struct mmc_ivars *ivar,
enum mmc_bus_timing timing)
{
struct mmc_command cmd;
int err;
uint8_t value;
if (mmcbr_get_mode(sc->dev) == mode_sd) {
memset(&cmd, 0, sizeof(cmd));
cmd.opcode = ACMD_SET_CLR_CARD_DETECT;
cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
cmd.arg = SD_CLR_CARD_DETECT;
err = mmc_wait_for_app_cmd(sc->dev, sc->dev, ivar->rca, &cmd,
CMD_RETRIES);
if (err != 0)
return (err);
memset(&cmd, 0, sizeof(cmd));
cmd.opcode = ACMD_SET_BUS_WIDTH;
cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
switch (ivar->bus_width) {
case bus_width_1:
cmd.arg = SD_BUS_WIDTH_1;
break;
case bus_width_4:
cmd.arg = SD_BUS_WIDTH_4;
break;
default:
return (MMC_ERR_INVALID);
}
err = mmc_wait_for_app_cmd(sc->dev, sc->dev, ivar->rca, &cmd,
CMD_RETRIES);
} else {
switch (ivar->bus_width) {
case bus_width_1:
if (timing == bus_timing_mmc_hs400 ||
timing == bus_timing_mmc_hs400es)
return (MMC_ERR_INVALID);
value = EXT_CSD_BUS_WIDTH_1;
break;
case bus_width_4:
switch (timing) {
case bus_timing_mmc_ddr52:
value = EXT_CSD_BUS_WIDTH_4_DDR;
break;
case bus_timing_mmc_hs400:
case bus_timing_mmc_hs400es:
return (MMC_ERR_INVALID);
default:
value = EXT_CSD_BUS_WIDTH_4;
break;
}
break;
case bus_width_8:
value = 0;
switch (timing) {
case bus_timing_mmc_hs400es:
value = EXT_CSD_BUS_WIDTH_ES;
/* FALLTHROUGH */
case bus_timing_mmc_ddr52:
case bus_timing_mmc_hs400:
value |= EXT_CSD_BUS_WIDTH_8_DDR;
break;
default:
value = EXT_CSD_BUS_WIDTH_8;
break;
}
break;
default:
return (MMC_ERR_INVALID);
}
err = mmc_switch(sc->dev, sc->dev, ivar->rca,
EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BUS_WIDTH, value,
ivar->cmd6_time, true);
}
return (err);
}
static int
mmc_set_power_class(struct mmc_softc *sc, struct mmc_ivars *ivar)
{
device_t dev;
const uint8_t *ext_csd;
uint32_t clock;
uint8_t value;
dev = sc->dev;
if (mmcbr_get_mode(dev) != mode_mmc || ivar->csd.spec_vers < 4)
return (MMC_ERR_NONE);
value = 0;
ext_csd = ivar->raw_ext_csd;
clock = mmcbr_get_clock(dev);
switch (1 << mmcbr_get_vdd(dev)) {
case MMC_OCR_LOW_VOLTAGE:
if (clock <= MMC_TYPE_HS_26_MAX)
value = ext_csd[EXT_CSD_PWR_CL_26_195];
else if (clock <= MMC_TYPE_HS_52_MAX) {
if (mmcbr_get_timing(dev) >= bus_timing_mmc_ddr52 &&
ivar->bus_width >= bus_width_4)
value = ext_csd[EXT_CSD_PWR_CL_52_195_DDR];
else
value = ext_csd[EXT_CSD_PWR_CL_52_195];
} else if (clock <= MMC_TYPE_HS200_HS400ES_MAX)
value = ext_csd[EXT_CSD_PWR_CL_200_195];
break;
case MMC_OCR_270_280:
case MMC_OCR_280_290:
case MMC_OCR_290_300:
case MMC_OCR_300_310:
case MMC_OCR_310_320:
case MMC_OCR_320_330:
case MMC_OCR_330_340:
case MMC_OCR_340_350:
case MMC_OCR_350_360:
if (clock <= MMC_TYPE_HS_26_MAX)
value = ext_csd[EXT_CSD_PWR_CL_26_360];
else if (clock <= MMC_TYPE_HS_52_MAX) {
if (mmcbr_get_timing(dev) == bus_timing_mmc_ddr52 &&
ivar->bus_width >= bus_width_4)
value = ext_csd[EXT_CSD_PWR_CL_52_360_DDR];
else
value = ext_csd[EXT_CSD_PWR_CL_52_360];
} else if (clock <= MMC_TYPE_HS200_HS400ES_MAX) {
if (ivar->bus_width == bus_width_8)
value = ext_csd[EXT_CSD_PWR_CL_200_360_DDR];
else
value = ext_csd[EXT_CSD_PWR_CL_200_360];
}
break;
default:
device_printf(dev, "No power class support for VDD 0x%x\n",
1 << mmcbr_get_vdd(dev));
return (MMC_ERR_INVALID);
}
if (ivar->bus_width == bus_width_8)
value = (value & EXT_CSD_POWER_CLASS_8BIT_MASK) >>
EXT_CSD_POWER_CLASS_8BIT_SHIFT;
else
value = (value & EXT_CSD_POWER_CLASS_4BIT_MASK) >>
EXT_CSD_POWER_CLASS_4BIT_SHIFT;
if (value == 0)
return (MMC_ERR_NONE);
return (mmc_switch(dev, dev, ivar->rca, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_POWER_CLASS, value, ivar->cmd6_time, true));
}
static int
mmc_set_timing(struct mmc_softc *sc, struct mmc_ivars *ivar,
enum mmc_bus_timing timing)
{
u_char switch_res[64];
uint8_t value;
int err;
if (mmcbr_get_mode(sc->dev) == mode_sd) {
switch (timing) {
case bus_timing_normal:
value = SD_SWITCH_NORMAL_MODE;
break;
case bus_timing_hs:
value = SD_SWITCH_HS_MODE;
break;
default:
return (MMC_ERR_INVALID);
}
err = mmc_sd_switch(sc, SD_SWITCH_MODE_SET, SD_SWITCH_GROUP1,
value, switch_res);
if (err != MMC_ERR_NONE)
return (err);
if ((switch_res[16] & 0xf) != value)
return (MMC_ERR_FAILED);
mmcbr_set_timing(sc->dev, timing);
mmcbr_update_ios(sc->dev);
} else {
switch (timing) {
case bus_timing_normal:
value = EXT_CSD_HS_TIMING_BC;
break;
case bus_timing_hs:
case bus_timing_mmc_ddr52:
value = EXT_CSD_HS_TIMING_HS;
break;
case bus_timing_mmc_hs200:
value = EXT_CSD_HS_TIMING_HS200;
break;
case bus_timing_mmc_hs400:
case bus_timing_mmc_hs400es:
value = EXT_CSD_HS_TIMING_HS400;
break;
default:
return (MMC_ERR_INVALID);
}
err = mmc_switch(sc->dev, sc->dev, ivar->rca,
EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING, value,
ivar->cmd6_time, false);
if (err != MMC_ERR_NONE)
return (err);
mmcbr_set_timing(sc->dev, timing);
mmcbr_update_ios(sc->dev);
err = mmc_switch_status(sc->dev, sc->dev, ivar->rca,
ivar->cmd6_time);
}
return (err);
}
static int
mmc_set_vccq(struct mmc_softc *sc, struct mmc_ivars *ivar,
enum mmc_bus_timing timing)
{
if (isset(&ivar->vccq_120, timing))
mmcbr_set_vccq(sc->dev, vccq_120);
else if (isset(&ivar->vccq_180, timing))
mmcbr_set_vccq(sc->dev, vccq_180);
else
mmcbr_set_vccq(sc->dev, vccq_330);
if (mmcbr_switch_vccq(sc->dev) != 0)
return (MMC_ERR_INVALID);
else
return (MMC_ERR_NONE);
}
static const uint8_t p8[8] = {
0x55, 0xAA, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
static const uint8_t p8ok[8] = {
0xAA, 0x55, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
static const uint8_t p4[4] = {
0x5A, 0x00, 0x00, 0x00
};
static const uint8_t p4ok[4] = {
0xA5, 0x00, 0x00, 0x00
};
static int
mmc_test_bus_width(struct mmc_softc *sc)
{
struct mmc_command cmd;
struct mmc_data data;
uint8_t buf[8];
int err;
if (mmcbr_get_caps(sc->dev) & MMC_CAP_8_BIT_DATA) {
mmcbr_set_bus_width(sc->dev, bus_width_8);
mmcbr_update_ios(sc->dev);
sc->squelched++; /* Errors are expected, squelch reporting. */
memset(&cmd, 0, sizeof(cmd));
memset(&data, 0, sizeof(data));
cmd.opcode = MMC_BUSTEST_W;
cmd.arg = 0;
cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
cmd.data = &data;
data.data = __DECONST(void *, p8);
data.len = 8;
data.flags = MMC_DATA_WRITE;
mmc_wait_for_cmd(sc->dev, sc->dev, &cmd, 0);
memset(&cmd, 0, sizeof(cmd));
memset(&data, 0, sizeof(data));
cmd.opcode = MMC_BUSTEST_R;
cmd.arg = 0;
cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
cmd.data = &data;
data.data = buf;
data.len = 8;
data.flags = MMC_DATA_READ;
err = mmc_wait_for_cmd(sc->dev, sc->dev, &cmd, 0);
sc->squelched--;
mmcbr_set_bus_width(sc->dev, bus_width_1);
mmcbr_update_ios(sc->dev);
if (err == MMC_ERR_NONE && memcmp(buf, p8ok, 8) == 0)
return (bus_width_8);
}
if (mmcbr_get_caps(sc->dev) & MMC_CAP_4_BIT_DATA) {
mmcbr_set_bus_width(sc->dev, bus_width_4);
mmcbr_update_ios(sc->dev);
sc->squelched++; /* Errors are expected, squelch reporting. */
memset(&cmd, 0, sizeof(cmd));
memset(&data, 0, sizeof(data));
cmd.opcode = MMC_BUSTEST_W;
cmd.arg = 0;
cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
cmd.data = &data;
data.data = __DECONST(void *, p4);
data.len = 4;
data.flags = MMC_DATA_WRITE;
mmc_wait_for_cmd(sc->dev, sc->dev, &cmd, 0);
memset(&cmd, 0, sizeof(cmd));
memset(&data, 0, sizeof(data));
cmd.opcode = MMC_BUSTEST_R;
cmd.arg = 0;
cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
cmd.data = &data;
data.data = buf;
data.len = 4;
data.flags = MMC_DATA_READ;
err = mmc_wait_for_cmd(sc->dev, sc->dev, &cmd, 0);
sc->squelched--;
mmcbr_set_bus_width(sc->dev, bus_width_1);
mmcbr_update_ios(sc->dev);
if (err == MMC_ERR_NONE && memcmp(buf, p4ok, 4) == 0)
return (bus_width_4);
}
return (bus_width_1);
}
static uint32_t
mmc_get_bits(uint32_t *bits, int bit_len, int start, int size)
{
const int i = (bit_len / 32) - (start / 32) - 1;
const int shift = start & 31;
uint32_t retval = bits[i] >> shift;
if (size + shift > 32)
retval |= bits[i - 1] << (32 - shift);
return (retval & ((1llu << size) - 1));
}
static void
mmc_decode_cid_sd(uint32_t *raw_cid, struct mmc_cid *cid)
{
int i;
/* There's no version info, so we take it on faith */
memset(cid, 0, sizeof(*cid));
cid->mid = mmc_get_bits(raw_cid, 128, 120, 8);
cid->oid = mmc_get_bits(raw_cid, 128, 104, 16);
for (i = 0; i < 5; i++)
cid->pnm[i] = mmc_get_bits(raw_cid, 128, 96 - i * 8, 8);
cid->pnm[5] = 0;
cid->prv = mmc_get_bits(raw_cid, 128, 56, 8);
cid->psn = mmc_get_bits(raw_cid, 128, 24, 32);
cid->mdt_year = mmc_get_bits(raw_cid, 128, 12, 8) + 2000;
cid->mdt_month = mmc_get_bits(raw_cid, 128, 8, 4);
}
static void
mmc_decode_cid_mmc(uint32_t *raw_cid, struct mmc_cid *cid, bool is_4_41p)
{
int i;
/* There's no version info, so we take it on faith */
memset(cid, 0, sizeof(*cid));
cid->mid = mmc_get_bits(raw_cid, 128, 120, 8);
cid->oid = mmc_get_bits(raw_cid, 128, 104, 8);
for (i = 0; i < 6; i++)
cid->pnm[i] = mmc_get_bits(raw_cid, 128, 96 - i * 8, 8);
cid->pnm[6] = 0;
cid->prv = mmc_get_bits(raw_cid, 128, 48, 8);
cid->psn = mmc_get_bits(raw_cid, 128, 16, 32);
cid->mdt_month = mmc_get_bits(raw_cid, 128, 12, 4);
cid->mdt_year = mmc_get_bits(raw_cid, 128, 8, 4);
if (is_4_41p)
cid->mdt_year += 2013;
else
cid->mdt_year += 1997;
}
static void
mmc_format_card_id_string(struct mmc_ivars *ivar)
{
char oidstr[8];
uint8_t c1;
uint8_t c2;
/*
* Format a card ID string for use by the mmcsd driver, it's what
* appears between the <> in the following:
* mmcsd0: 968MB <SD SD01G 8.0 SN 2686905 MFG 08/2008 by 3 TN> at mmc0
* 22.5MHz/4bit/128-block
*
* Also format just the card serial number, which the mmcsd driver will
* use as the disk->d_ident string.
*
* The card_id_string in mmc_ivars is currently allocated as 64 bytes,
* and our max formatted length is currently 55 bytes if every field
* contains the largest value.
*
* Sometimes the oid is two printable ascii chars; when it's not,
* format it as 0xnnnn instead.
*/
c1 = (ivar->cid.oid >> 8) & 0x0ff;
c2 = ivar->cid.oid & 0x0ff;
if (c1 > 0x1f && c1 < 0x7f && c2 > 0x1f && c2 < 0x7f)
snprintf(oidstr, sizeof(oidstr), "%c%c", c1, c2);
else
snprintf(oidstr, sizeof(oidstr), "0x%04x", ivar->cid.oid);
snprintf(ivar->card_sn_string, sizeof(ivar->card_sn_string),
"%08X", ivar->cid.psn);
snprintf(ivar->card_id_string, sizeof(ivar->card_id_string),
"%s%s %s %d.%d SN %08X MFG %02d/%04d by %d %s",
ivar->mode == mode_sd ? "SD" : "MMC", ivar->high_cap ? "HC" : "",
ivar->cid.pnm, ivar->cid.prv >> 4, ivar->cid.prv & 0x0f,
ivar->cid.psn, ivar->cid.mdt_month, ivar->cid.mdt_year,
ivar->cid.mid, oidstr);
}
static const int exp[8] = {
1, 10, 100, 1000, 10000, 100000, 1000000, 10000000
};
static const int mant[16] = {
0, 10, 12, 13, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 70, 80
};
static const int cur_min[8] = {
500, 1000, 5000, 10000, 25000, 35000, 60000, 100000
};
static const int cur_max[8] = {
1000, 5000, 10000, 25000, 35000, 45000, 800000, 200000
};
static int
mmc_decode_csd_sd(uint32_t *raw_csd, struct mmc_csd *csd)
{
int v;
int m;
int e;
memset(csd, 0, sizeof(*csd));
csd->csd_structure = v = mmc_get_bits(raw_csd, 128, 126, 2);
if (v == 0) {
m = mmc_get_bits(raw_csd, 128, 115, 4);
e = mmc_get_bits(raw_csd, 128, 112, 3);
csd->tacc = (exp[e] * mant[m] + 9) / 10;
csd->nsac = mmc_get_bits(raw_csd, 128, 104, 8) * 100;
m = mmc_get_bits(raw_csd, 128, 99, 4);
e = mmc_get_bits(raw_csd, 128, 96, 3);
csd->tran_speed = exp[e] * 10000 * mant[m];
csd->ccc = mmc_get_bits(raw_csd, 128, 84, 12);
csd->read_bl_len = 1 << mmc_get_bits(raw_csd, 128, 80, 4);
csd->read_bl_partial = mmc_get_bits(raw_csd, 128, 79, 1);
csd->write_blk_misalign = mmc_get_bits(raw_csd, 128, 78, 1);
csd->read_blk_misalign = mmc_get_bits(raw_csd, 128, 77, 1);
csd->dsr_imp = mmc_get_bits(raw_csd, 128, 76, 1);
csd->vdd_r_curr_min =
cur_min[mmc_get_bits(raw_csd, 128, 59, 3)];
csd->vdd_r_curr_max =
cur_max[mmc_get_bits(raw_csd, 128, 56, 3)];
csd->vdd_w_curr_min =
cur_min[mmc_get_bits(raw_csd, 128, 53, 3)];
csd->vdd_w_curr_max =
cur_max[mmc_get_bits(raw_csd, 128, 50, 3)];
m = mmc_get_bits(raw_csd, 128, 62, 12);
e = mmc_get_bits(raw_csd, 128, 47, 3);
csd->capacity = ((1 + m) << (e + 2)) * csd->read_bl_len;
csd->erase_blk_en = mmc_get_bits(raw_csd, 128, 46, 1);
csd->erase_sector = mmc_get_bits(raw_csd, 128, 39, 7) + 1;
csd->wp_grp_size = mmc_get_bits(raw_csd, 128, 32, 7);
csd->wp_grp_enable = mmc_get_bits(raw_csd, 128, 31, 1);
csd->r2w_factor = 1 << mmc_get_bits(raw_csd, 128, 26, 3);
csd->write_bl_len = 1 << mmc_get_bits(raw_csd, 128, 22, 4);
csd->write_bl_partial = mmc_get_bits(raw_csd, 128, 21, 1);
return (MMC_ERR_NONE);
} else if (v == 1) {
m = mmc_get_bits(raw_csd, 128, 115, 4);
e = mmc_get_bits(raw_csd, 128, 112, 3);
csd->tacc = (exp[e] * mant[m] + 9) / 10;
csd->nsac = mmc_get_bits(raw_csd, 128, 104, 8) * 100;
m = mmc_get_bits(raw_csd, 128, 99, 4);
e = mmc_get_bits(raw_csd, 128, 96, 3);
csd->tran_speed = exp[e] * 10000 * mant[m];
csd->ccc = mmc_get_bits(raw_csd, 128, 84, 12);
csd->read_bl_len = 1 << mmc_get_bits(raw_csd, 128, 80, 4);
csd->read_bl_partial = mmc_get_bits(raw_csd, 128, 79, 1);
csd->write_blk_misalign = mmc_get_bits(raw_csd, 128, 78, 1);
csd->read_blk_misalign = mmc_get_bits(raw_csd, 128, 77, 1);
csd->dsr_imp = mmc_get_bits(raw_csd, 128, 76, 1);
csd->capacity = ((uint64_t)mmc_get_bits(raw_csd, 128, 48, 22) +
1) * 512 * 1024;
csd->erase_blk_en = mmc_get_bits(raw_csd, 128, 46, 1);
csd->erase_sector = mmc_get_bits(raw_csd, 128, 39, 7) + 1;
csd->wp_grp_size = mmc_get_bits(raw_csd, 128, 32, 7);
csd->wp_grp_enable = mmc_get_bits(raw_csd, 128, 31, 1);
csd->r2w_factor = 1 << mmc_get_bits(raw_csd, 128, 26, 3);
csd->write_bl_len = 1 << mmc_get_bits(raw_csd, 128, 22, 4);
csd->write_bl_partial = mmc_get_bits(raw_csd, 128, 21, 1);
return (MMC_ERR_NONE);
}
return (MMC_ERR_INVALID);
}
static void
mmc_decode_csd_mmc(uint32_t *raw_csd, struct mmc_csd *csd)
{
int m;
int e;
memset(csd, 0, sizeof(*csd));
csd->csd_structure = mmc_get_bits(raw_csd, 128, 126, 2);
csd->spec_vers = mmc_get_bits(raw_csd, 128, 122, 4);
m = mmc_get_bits(raw_csd, 128, 115, 4);
e = mmc_get_bits(raw_csd, 128, 112, 3);
csd->tacc = exp[e] * mant[m] + 9 / 10;
csd->nsac = mmc_get_bits(raw_csd, 128, 104, 8) * 100;
m = mmc_get_bits(raw_csd, 128, 99, 4);
e = mmc_get_bits(raw_csd, 128, 96, 3);
csd->tran_speed = exp[e] * 10000 * mant[m];
csd->ccc = mmc_get_bits(raw_csd, 128, 84, 12);
csd->read_bl_len = 1 << mmc_get_bits(raw_csd, 128, 80, 4);
csd->read_bl_partial = mmc_get_bits(raw_csd, 128, 79, 1);
csd->write_blk_misalign = mmc_get_bits(raw_csd, 128, 78, 1);
csd->read_blk_misalign = mmc_get_bits(raw_csd, 128, 77, 1);
csd->dsr_imp = mmc_get_bits(raw_csd, 128, 76, 1);
csd->vdd_r_curr_min = cur_min[mmc_get_bits(raw_csd, 128, 59, 3)];
csd->vdd_r_curr_max = cur_max[mmc_get_bits(raw_csd, 128, 56, 3)];
csd->vdd_w_curr_min = cur_min[mmc_get_bits(raw_csd, 128, 53, 3)];
csd->vdd_w_curr_max = cur_max[mmc_get_bits(raw_csd, 128, 50, 3)];
m = mmc_get_bits(raw_csd, 128, 62, 12);
e = mmc_get_bits(raw_csd, 128, 47, 3);
csd->capacity = ((1 + m) << (e + 2)) * csd->read_bl_len;
csd->erase_blk_en = 0;
csd->erase_sector = (mmc_get_bits(raw_csd, 128, 42, 5) + 1) *
(mmc_get_bits(raw_csd, 128, 37, 5) + 1);
csd->wp_grp_size = mmc_get_bits(raw_csd, 128, 32, 5);
csd->wp_grp_enable = mmc_get_bits(raw_csd, 128, 31, 1);
csd->r2w_factor = 1 << mmc_get_bits(raw_csd, 128, 26, 3);
csd->write_bl_len = 1 << mmc_get_bits(raw_csd, 128, 22, 4);
csd->write_bl_partial = mmc_get_bits(raw_csd, 128, 21, 1);
}
static void
mmc_app_decode_scr(uint32_t *raw_scr, struct mmc_scr *scr)
{
unsigned int scr_struct;
memset(scr, 0, sizeof(*scr));
scr_struct = mmc_get_bits(raw_scr, 64, 60, 4);
if (scr_struct != 0) {
printf("Unrecognised SCR structure version %d\n",
scr_struct);
return;
}
scr->sda_vsn = mmc_get_bits(raw_scr, 64, 56, 4);
scr->bus_widths = mmc_get_bits(raw_scr, 64, 48, 4);
}
static void
mmc_app_decode_sd_status(uint32_t *raw_sd_status,
struct mmc_sd_status *sd_status)
{
memset(sd_status, 0, sizeof(*sd_status));
sd_status->bus_width = mmc_get_bits(raw_sd_status, 512, 510, 2);
sd_status->secured_mode = mmc_get_bits(raw_sd_status, 512, 509, 1);
sd_status->card_type = mmc_get_bits(raw_sd_status, 512, 480, 16);
sd_status->prot_area = mmc_get_bits(raw_sd_status, 512, 448, 12);
sd_status->speed_class = mmc_get_bits(raw_sd_status, 512, 440, 8);
sd_status->perf_move = mmc_get_bits(raw_sd_status, 512, 432, 8);
sd_status->au_size = mmc_get_bits(raw_sd_status, 512, 428, 4);
sd_status->erase_size = mmc_get_bits(raw_sd_status, 512, 408, 16);
sd_status->erase_timeout = mmc_get_bits(raw_sd_status, 512, 402, 6);
sd_status->erase_offset = mmc_get_bits(raw_sd_status, 512, 400, 2);
}
static int
mmc_all_send_cid(struct mmc_softc *sc, uint32_t *rawcid)
{
struct mmc_command cmd;
int err;
memset(&cmd, 0, sizeof(cmd));
cmd.opcode = MMC_ALL_SEND_CID;
cmd.arg = 0;
cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
cmd.data = NULL;
err = mmc_wait_for_cmd(sc->dev, sc->dev, &cmd, CMD_RETRIES);
memcpy(rawcid, cmd.resp, 4 * sizeof(uint32_t));
return (err);
}
static int
mmc_send_csd(struct mmc_softc *sc, uint16_t rca, uint32_t *rawcsd)
{
struct mmc_command cmd;
int err;
memset(&cmd, 0, sizeof(cmd));
cmd.opcode = MMC_SEND_CSD;
cmd.arg = rca << 16;
cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
cmd.data = NULL;
err = mmc_wait_for_cmd(sc->dev, sc->dev, &cmd, CMD_RETRIES);
memcpy(rawcsd, cmd.resp, 4 * sizeof(uint32_t));
return (err);
}
static int
mmc_app_send_scr(struct mmc_softc *sc, uint16_t rca, uint32_t *rawscr)
{
int err;
struct mmc_command cmd;
struct mmc_data data;
memset(&cmd, 0, sizeof(cmd));
memset(&data, 0, sizeof(data));
memset(rawscr, 0, 8);
cmd.opcode = ACMD_SEND_SCR;
cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
cmd.arg = 0;
cmd.data = &data;
data.data = rawscr;
data.len = 8;
data.flags = MMC_DATA_READ;
err = mmc_wait_for_app_cmd(sc->dev, sc->dev, rca, &cmd, CMD_RETRIES);
rawscr[0] = be32toh(rawscr[0]);
rawscr[1] = be32toh(rawscr[1]);
return (err);
}
static int
mmc_app_sd_status(struct mmc_softc *sc, uint16_t rca, uint32_t *rawsdstatus)
{
struct mmc_command cmd;
struct mmc_data data;
int err, i;
memset(&cmd, 0, sizeof(cmd));
memset(&data, 0, sizeof(data));
memset(rawsdstatus, 0, 64);
cmd.opcode = ACMD_SD_STATUS;
cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
cmd.arg = 0;
cmd.data = &data;
data.data = rawsdstatus;
data.len = 64;
data.flags = MMC_DATA_READ;
err = mmc_wait_for_app_cmd(sc->dev, sc->dev, rca, &cmd, CMD_RETRIES);
for (i = 0; i < 16; i++)
rawsdstatus[i] = be32toh(rawsdstatus[i]);
return (err);
}
static int
mmc_set_relative_addr(struct mmc_softc *sc, uint16_t resp)
{
struct mmc_command cmd;
int err;
memset(&cmd, 0, sizeof(cmd));
cmd.opcode = MMC_SET_RELATIVE_ADDR;
cmd.arg = resp << 16;
cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
cmd.data = NULL;
err = mmc_wait_for_cmd(sc->dev, sc->dev, &cmd, CMD_RETRIES);
return (err);
}
static int
mmc_send_relative_addr(struct mmc_softc *sc, uint32_t *resp)
{
struct mmc_command cmd;
int err;
memset(&cmd, 0, sizeof(cmd));
cmd.opcode = SD_SEND_RELATIVE_ADDR;
cmd.arg = 0;
cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
cmd.data = NULL;
err = mmc_wait_for_cmd(sc->dev, sc->dev, &cmd, CMD_RETRIES);
*resp = cmd.resp[0];
return (err);
}
static int
mmc_set_blocklen(struct mmc_softc *sc, uint32_t len)
{
struct mmc_command cmd;
int err;
memset(&cmd, 0, sizeof(cmd));
cmd.opcode = MMC_SET_BLOCKLEN;
cmd.arg = len;
cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
cmd.data = NULL;
err = mmc_wait_for_cmd(sc->dev, sc->dev, &cmd, CMD_RETRIES);
return (err);
}
static uint32_t
mmc_timing_to_dtr(struct mmc_ivars *ivar, enum mmc_bus_timing timing)
{
switch (timing) {
case bus_timing_normal:
return (ivar->tran_speed);
case bus_timing_hs:
return (ivar->hs_tran_speed);
case bus_timing_uhs_sdr12:
return (SD_SDR12_MAX);
case bus_timing_uhs_sdr25:
return (SD_SDR25_MAX);
case bus_timing_uhs_ddr50:
return (SD_DDR50_MAX);
case bus_timing_uhs_sdr50:
return (SD_SDR50_MAX);
case bus_timing_uhs_sdr104:
return (SD_SDR104_MAX);
case bus_timing_mmc_ddr52:
return (MMC_TYPE_DDR52_MAX);
case bus_timing_mmc_hs200:
case bus_timing_mmc_hs400:
case bus_timing_mmc_hs400es:
return (MMC_TYPE_HS200_HS400ES_MAX);
}
return (0);
}
static const char *
mmc_timing_to_string(enum mmc_bus_timing timing)
{
switch (timing) {
case bus_timing_normal:
return ("normal speed");
case bus_timing_hs:
return ("high speed");
case bus_timing_uhs_sdr12:
case bus_timing_uhs_sdr25:
case bus_timing_uhs_sdr50:
case bus_timing_uhs_sdr104:
return ("single data rate");
case bus_timing_uhs_ddr50:
case bus_timing_mmc_ddr52:
return ("dual data rate");
case bus_timing_mmc_hs200:
return ("HS200");
case bus_timing_mmc_hs400:
return ("HS400");
case bus_timing_mmc_hs400es:
return ("HS400 with enhanced strobe");
}
return ("");
}
static bool
mmc_host_timing(device_t dev, enum mmc_bus_timing timing)
{
int host_caps;
host_caps = mmcbr_get_caps(dev);
#define HOST_TIMING_CAP(host_caps, cap) ({ \
bool retval; \
if (((host_caps) & (cap)) == (cap)) \
retval = true; \
else \
retval = false; \
retval; \
})
switch (timing) {
case bus_timing_normal:
return (true);
case bus_timing_hs:
return (HOST_TIMING_CAP(host_caps, MMC_CAP_HSPEED));
case bus_timing_uhs_sdr12:
return (HOST_TIMING_CAP(host_caps, MMC_CAP_UHS_SDR12));
case bus_timing_uhs_sdr25:
return (HOST_TIMING_CAP(host_caps, MMC_CAP_UHS_SDR25));
case bus_timing_uhs_ddr50:
return (HOST_TIMING_CAP(host_caps, MMC_CAP_UHS_DDR50));
case bus_timing_uhs_sdr50:
return (HOST_TIMING_CAP(host_caps, MMC_CAP_UHS_SDR50));
case bus_timing_uhs_sdr104:
return (HOST_TIMING_CAP(host_caps, MMC_CAP_UHS_SDR104));
case bus_timing_mmc_ddr52:
return (HOST_TIMING_CAP(host_caps, MMC_CAP_MMC_DDR52));
case bus_timing_mmc_hs200:
return (HOST_TIMING_CAP(host_caps, MMC_CAP_MMC_HS200));
case bus_timing_mmc_hs400:
return (HOST_TIMING_CAP(host_caps, MMC_CAP_MMC_HS400));
case bus_timing_mmc_hs400es:
return (HOST_TIMING_CAP(host_caps, MMC_CAP_MMC_HS400 |
MMC_CAP_MMC_ENH_STROBE));
}
#undef HOST_TIMING_CAP
return (false);
}
static void
mmc_log_card(device_t dev, struct mmc_ivars *ivar, int newcard)
{
enum mmc_bus_timing max_timing, timing;
device_printf(dev, "Card at relative address 0x%04x%s:\n",
ivar->rca, newcard ? " added" : "");
device_printf(dev, " card: %s\n", ivar->card_id_string);
max_timing = bus_timing_normal;
for (timing = bus_timing_max; timing > bus_timing_normal; timing--) {
if (isset(&ivar->timings, timing)) {
max_timing = timing;
break;
}
}
device_printf(dev, " quirks: %b\n", ivar->quirks, MMC_QUIRKS_FMT);
device_printf(dev, " bus: %ubit, %uMHz (%s timing)\n",
(ivar->bus_width == bus_width_1 ? 1 :
(ivar->bus_width == bus_width_4 ? 4 : 8)),
mmc_timing_to_dtr(ivar, timing) / 1000000,
mmc_timing_to_string(timing));
device_printf(dev, " memory: %u blocks, erase sector %u blocks%s\n",
ivar->sec_count, ivar->erase_sector,
ivar->read_only ? ", read-only" : "");
}
static void
mmc_discover_cards(struct mmc_softc *sc)
{
u_char switch_res[64];
uint32_t raw_cid[4];
struct mmc_ivars *ivar = NULL;
const struct mmc_quirk *quirk;
device_t child;
int err, host_caps, i, newcard;
uint32_t resp, sec_count, status;
uint16_t rca = 2;
host_caps = mmcbr_get_caps(sc->dev);
if (bootverbose || mmc_debug)
device_printf(sc->dev, "Probing cards\n");
while (1) {
child = NULL;
sc->squelched++; /* Errors are expected, squelch reporting. */
err = mmc_all_send_cid(sc, raw_cid);
sc->squelched--;
if (err == MMC_ERR_TIMEOUT)
break;
if (err != MMC_ERR_NONE) {
device_printf(sc->dev, "Error reading CID %d\n", err);
break;
}
newcard = 1;
for (i = 0; i < sc->child_count; i++) {
ivar = device_get_ivars(sc->child_list[i]);
if (memcmp(ivar->raw_cid, raw_cid, sizeof(raw_cid)) ==
0) {
newcard = 0;
break;
}
}
if (bootverbose || mmc_debug) {
device_printf(sc->dev,
"%sard detected (CID %08x%08x%08x%08x)\n",
newcard ? "New c" : "C",
raw_cid[0], raw_cid[1], raw_cid[2], raw_cid[3]);
}
if (newcard) {
ivar = malloc(sizeof(struct mmc_ivars), M_DEVBUF,
M_WAITOK | M_ZERO);
memcpy(ivar->raw_cid, raw_cid, sizeof(raw_cid));
}
if (mmcbr_get_ro(sc->dev))
ivar->read_only = 1;
ivar->bus_width = bus_width_1;
setbit(&ivar->timings, bus_timing_normal);
ivar->mode = mmcbr_get_mode(sc->dev);
if (ivar->mode == mode_sd) {
mmc_decode_cid_sd(ivar->raw_cid, &ivar->cid);
err = mmc_send_relative_addr(sc, &resp);
if (err != MMC_ERR_NONE) {
device_printf(sc->dev,
"Error getting RCA %d\n", err);
goto free_ivar;
}
ivar->rca = resp >> 16;
/* Get card CSD. */
err = mmc_send_csd(sc, ivar->rca, ivar->raw_csd);
if (err != MMC_ERR_NONE) {
device_printf(sc->dev,
"Error getting CSD %d\n", err);
goto free_ivar;
}
if (bootverbose || mmc_debug)
device_printf(sc->dev,
"%sard detected (CSD %08x%08x%08x%08x)\n",
newcard ? "New c" : "C", ivar->raw_csd[0],
ivar->raw_csd[1], ivar->raw_csd[2],
ivar->raw_csd[3]);
err = mmc_decode_csd_sd(ivar->raw_csd, &ivar->csd);
if (err != MMC_ERR_NONE) {
device_printf(sc->dev, "Error decoding CSD\n");
goto free_ivar;
}
ivar->sec_count = ivar->csd.capacity / MMC_SECTOR_SIZE;
if (ivar->csd.csd_structure > 0)
ivar->high_cap = 1;
ivar->tran_speed = ivar->csd.tran_speed;
ivar->erase_sector = ivar->csd.erase_sector *
ivar->csd.write_bl_len / MMC_SECTOR_SIZE;
err = mmc_send_status(sc->dev, sc->dev, ivar->rca,
&status);
if (err != MMC_ERR_NONE) {
device_printf(sc->dev,
"Error reading card status %d\n", err);
goto free_ivar;
}
if ((status & R1_CARD_IS_LOCKED) != 0) {
device_printf(sc->dev,
"Card is password protected, skipping\n");
goto free_ivar;
}
/* Get card SCR. Card must be selected to fetch it. */
err = mmc_select_card(sc, ivar->rca);
if (err != MMC_ERR_NONE) {
device_printf(sc->dev,
"Error selecting card %d\n", err);
goto free_ivar;
}
err = mmc_app_send_scr(sc, ivar->rca, ivar->raw_scr);
if (err != MMC_ERR_NONE) {
device_printf(sc->dev,
"Error reading SCR %d\n", err);
goto free_ivar;
}
mmc_app_decode_scr(ivar->raw_scr, &ivar->scr);
/* Get card switch capabilities (command class 10). */
if ((ivar->scr.sda_vsn >= 1) &&
(ivar->csd.ccc & (1 << 10))) {
err = mmc_sd_switch(sc, SD_SWITCH_MODE_CHECK,
SD_SWITCH_GROUP1, SD_SWITCH_NOCHANGE,
switch_res);
if (err == MMC_ERR_NONE &&
switch_res[13] & (1 << SD_SWITCH_HS_MODE)) {
setbit(&ivar->timings, bus_timing_hs);
ivar->hs_tran_speed = SD_HS_MAX;
}
}
/*
* We deselect then reselect the card here. Some cards
* become unselected and timeout with the above two
* commands, although the state tables / diagrams in the
* standard suggest they go back to the transfer state.
* Other cards don't become deselected, and if we
* attempt to blindly re-select them, we get timeout
* errors from some controllers. So we deselect then
* reselect to handle all situations. The only thing we
* use from the sd_status is the erase sector size, but
* it is still nice to get that right.
*/
(void)mmc_select_card(sc, 0);
(void)mmc_select_card(sc, ivar->rca);
(void)mmc_app_sd_status(sc, ivar->rca,
ivar->raw_sd_status);
mmc_app_decode_sd_status(ivar->raw_sd_status,
&ivar->sd_status);
if (ivar->sd_status.au_size != 0) {
ivar->erase_sector =
16 << ivar->sd_status.au_size;
}
/* Find maximum supported bus width. */
if ((host_caps & MMC_CAP_4_BIT_DATA) &&
(ivar->scr.bus_widths & SD_SCR_BUS_WIDTH_4))
ivar->bus_width = bus_width_4;
goto child_common;
}
ivar->rca = rca++;
err = mmc_set_relative_addr(sc, ivar->rca);
if (err != MMC_ERR_NONE) {
device_printf(sc->dev, "Error setting RCA %d\n", err);
goto free_ivar;
}
/* Get card CSD. */
err = mmc_send_csd(sc, ivar->rca, ivar->raw_csd);
if (err != MMC_ERR_NONE) {
device_printf(sc->dev, "Error getting CSD %d\n", err);
goto free_ivar;
}
if (bootverbose || mmc_debug)
device_printf(sc->dev,
"%sard detected (CSD %08x%08x%08x%08x)\n",
newcard ? "New c" : "C", ivar->raw_csd[0],
ivar->raw_csd[1], ivar->raw_csd[2],
ivar->raw_csd[3]);
mmc_decode_csd_mmc(ivar->raw_csd, &ivar->csd);
ivar->sec_count = ivar->csd.capacity / MMC_SECTOR_SIZE;
ivar->tran_speed = ivar->csd.tran_speed;
ivar->erase_sector = ivar->csd.erase_sector *
ivar->csd.write_bl_len / MMC_SECTOR_SIZE;
err = mmc_send_status(sc->dev, sc->dev, ivar->rca, &status);
if (err != MMC_ERR_NONE) {
device_printf(sc->dev,
"Error reading card status %d\n", err);
goto free_ivar;
}
if ((status & R1_CARD_IS_LOCKED) != 0) {
device_printf(sc->dev,
"Card is password protected, skipping\n");
goto free_ivar;
}
err = mmc_select_card(sc, ivar->rca);
if (err != MMC_ERR_NONE) {
device_printf(sc->dev, "Error selecting card %d\n",
err);
goto free_ivar;
}
/* Only MMC >= 4.x devices support EXT_CSD. */
if (ivar->csd.spec_vers >= 4) {
err = mmc_send_ext_csd(sc->dev, sc->dev,
ivar->raw_ext_csd);
if (err != MMC_ERR_NONE) {
device_printf(sc->dev,
"Error reading EXT_CSD %d\n", err);
goto free_ivar;
}
/* Handle extended capacity from EXT_CSD */
sec_count = ivar->raw_ext_csd[EXT_CSD_SEC_CNT] +
(ivar->raw_ext_csd[EXT_CSD_SEC_CNT + 1] << 8) +
(ivar->raw_ext_csd[EXT_CSD_SEC_CNT + 2] << 16) +
(ivar->raw_ext_csd[EXT_CSD_SEC_CNT + 3] << 24);
if (sec_count != 0) {
ivar->sec_count = sec_count;
ivar->high_cap = 1;
}
/* Find maximum supported bus width. */
ivar->bus_width = mmc_test_bus_width(sc);
/* Get device speeds beyond normal mode. */
if ((ivar->raw_ext_csd[EXT_CSD_CARD_TYPE] &
EXT_CSD_CARD_TYPE_HS_52) != 0) {
setbit(&ivar->timings, bus_timing_hs);
ivar->hs_tran_speed = MMC_TYPE_HS_52_MAX;
} else if ((ivar->raw_ext_csd[EXT_CSD_CARD_TYPE] &
EXT_CSD_CARD_TYPE_HS_26) != 0) {
setbit(&ivar->timings, bus_timing_hs);
ivar->hs_tran_speed = MMC_TYPE_HS_26_MAX;
}
if ((ivar->raw_ext_csd[EXT_CSD_CARD_TYPE] &
EXT_CSD_CARD_TYPE_DDR_52_1_2V) != 0 &&
(host_caps & MMC_CAP_SIGNALING_120) != 0) {
setbit(&ivar->timings, bus_timing_mmc_ddr52);
setbit(&ivar->vccq_120, bus_timing_mmc_ddr52);
}
if ((ivar->raw_ext_csd[EXT_CSD_CARD_TYPE] &
EXT_CSD_CARD_TYPE_DDR_52_1_8V) != 0 &&
(host_caps & MMC_CAP_SIGNALING_180) != 0) {
setbit(&ivar->timings, bus_timing_mmc_ddr52);
setbit(&ivar->vccq_180, bus_timing_mmc_ddr52);
}
if ((ivar->raw_ext_csd[EXT_CSD_CARD_TYPE] &
EXT_CSD_CARD_TYPE_HS200_1_2V) != 0 &&
(host_caps & MMC_CAP_SIGNALING_120) != 0) {
setbit(&ivar->timings, bus_timing_mmc_hs200);
setbit(&ivar->vccq_120, bus_timing_mmc_hs200);
}
if ((ivar->raw_ext_csd[EXT_CSD_CARD_TYPE] &
EXT_CSD_CARD_TYPE_HS200_1_8V) != 0 &&
(host_caps & MMC_CAP_SIGNALING_180) != 0) {
setbit(&ivar->timings, bus_timing_mmc_hs200);
setbit(&ivar->vccq_180, bus_timing_mmc_hs200);
}
if ((ivar->raw_ext_csd[EXT_CSD_CARD_TYPE] &
EXT_CSD_CARD_TYPE_HS400_1_2V) != 0 &&
(host_caps & MMC_CAP_SIGNALING_120) != 0 &&
ivar->bus_width == bus_width_8) {
setbit(&ivar->timings, bus_timing_mmc_hs400);
setbit(&ivar->vccq_120, bus_timing_mmc_hs400);
}
if ((ivar->raw_ext_csd[EXT_CSD_CARD_TYPE] &
EXT_CSD_CARD_TYPE_HS400_1_8V) != 0 &&
(host_caps & MMC_CAP_SIGNALING_180) != 0 &&
ivar->bus_width == bus_width_8) {
setbit(&ivar->timings, bus_timing_mmc_hs400);
setbit(&ivar->vccq_180, bus_timing_mmc_hs400);
}
if ((ivar->raw_ext_csd[EXT_CSD_CARD_TYPE] &
EXT_CSD_CARD_TYPE_HS400_1_2V) != 0 &&
(ivar->raw_ext_csd[EXT_CSD_STROBE_SUPPORT] &
EXT_CSD_STROBE_SUPPORT_EN) != 0 &&
(host_caps & MMC_CAP_SIGNALING_120) != 0 &&
ivar->bus_width == bus_width_8) {
setbit(&ivar->timings, bus_timing_mmc_hs400es);
setbit(&ivar->vccq_120, bus_timing_mmc_hs400es);
}
if ((ivar->raw_ext_csd[EXT_CSD_CARD_TYPE] &
EXT_CSD_CARD_TYPE_HS400_1_8V) != 0 &&
(ivar->raw_ext_csd[EXT_CSD_STROBE_SUPPORT] &
EXT_CSD_STROBE_SUPPORT_EN) != 0 &&
(host_caps & MMC_CAP_SIGNALING_180) != 0 &&
ivar->bus_width == bus_width_8) {
setbit(&ivar->timings, bus_timing_mmc_hs400es);
setbit(&ivar->vccq_180, bus_timing_mmc_hs400es);
}
/*
* Determine generic switch timeout (provided in
* units of 10 ms), defaulting to 500 ms.
*/
ivar->cmd6_time = 500 * 1000;
if (ivar->csd.spec_vers >= 6)
ivar->cmd6_time = 10 *
ivar->raw_ext_csd[EXT_CSD_GEN_CMD6_TIME];
/* Handle HC erase sector size. */
if (ivar->raw_ext_csd[EXT_CSD_ERASE_GRP_SIZE] != 0) {
ivar->erase_sector = 1024 *
ivar->raw_ext_csd[EXT_CSD_ERASE_GRP_SIZE];
err = mmc_switch(sc->dev, sc->dev, ivar->rca,
EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_ERASE_GRP_DEF,
EXT_CSD_ERASE_GRP_DEF_EN,
ivar->cmd6_time, true);
if (err != MMC_ERR_NONE) {
device_printf(sc->dev,
"Error setting erase group %d\n",
err);
goto free_ivar;
}
}
}
mmc_decode_cid_mmc(ivar->raw_cid, &ivar->cid,
ivar->raw_ext_csd[EXT_CSD_REV] >= 5);
child_common:
for (quirk = &mmc_quirks[0]; quirk->mid != 0x0; quirk++) {
if ((quirk->mid == MMC_QUIRK_MID_ANY ||
quirk->mid == ivar->cid.mid) &&
(quirk->oid == MMC_QUIRK_OID_ANY ||
quirk->oid == ivar->cid.oid) &&
strncmp(quirk->pnm, ivar->cid.pnm,
sizeof(ivar->cid.pnm)) == 0) {
ivar->quirks = quirk->quirks;
break;
}
}
/*
* Some cards that report maximum I/O block sizes greater
* than 512 require the block length to be set to 512, even
* though that is supposed to be the default. Example:
*
* Transcend 2GB SDSC card, CID:
* mid=0x1b oid=0x534d pnm="00000" prv=1.0 mdt=00.2000
*/
if (ivar->csd.read_bl_len != MMC_SECTOR_SIZE ||
ivar->csd.write_bl_len != MMC_SECTOR_SIZE)
mmc_set_blocklen(sc, MMC_SECTOR_SIZE);
mmc_format_card_id_string(ivar);
if (bootverbose || mmc_debug)
mmc_log_card(sc->dev, ivar, newcard);
if (newcard) {
/* Add device. */
child = device_add_child(sc->dev, NULL, -1);
if (child != NULL) {
device_set_ivars(child, ivar);
sc->child_list = realloc(sc->child_list,
sizeof(device_t) * sc->child_count + 1,
M_DEVBUF, M_WAITOK);
sc->child_list[sc->child_count++] = child;
} else
device_printf(sc->dev, "Error adding child\n");
}
free_ivar:
if (newcard && child == NULL)
free(ivar, M_DEVBUF);
(void)mmc_select_card(sc, 0);
/*
* Not returning here when one MMC device could no be added
* potentially would mean looping forever when that device
* is broken (in which case it also may impact the remainder
* of the bus anyway, though).
*/
if ((newcard && child == NULL) ||
mmcbr_get_mode(sc->dev) == mode_sd)
return;
}
}
static void
mmc_update_child_list(struct mmc_softc *sc)
{
device_t child;
int i, j;
if (sc->child_count == 0) {
free(sc->child_list, M_DEVBUF);
return;
}
for (i = j = 0; i < sc->child_count; i++) {
for (;;) {
child = sc->child_list[j++];
if (child != NULL)
break;
}
if (i != j)
sc->child_list[i] = child;
}
sc->child_list = realloc(sc->child_list, sizeof(device_t) *
sc->child_count, M_DEVBUF, M_WAITOK);
}
static void
mmc_rescan_cards(struct mmc_softc *sc)
{
struct mmc_ivars *ivar;
int err, i, j;
for (i = j = 0; i < sc->child_count; i++) {
ivar = device_get_ivars(sc->child_list[i]);
if (mmc_select_card(sc, ivar->rca) != MMC_ERR_NONE) {
if (bootverbose || mmc_debug)
device_printf(sc->dev,
"Card at relative address %d lost\n",
ivar->rca);
err = device_delete_child(sc->dev, sc->child_list[i]);
if (err != 0) {
j++;
continue;
}
free(ivar, M_DEVBUF);
} else
j++;
}
if (sc->child_count == j)
goto out;
sc->child_count = j;
mmc_update_child_list(sc);
out:
(void)mmc_select_card(sc, 0);
}
static int
mmc_delete_cards(struct mmc_softc *sc, bool final)
{
struct mmc_ivars *ivar;
int err, i, j;
err = 0;
for (i = j = 0; i < sc->child_count; i++) {
ivar = device_get_ivars(sc->child_list[i]);
if (bootverbose || mmc_debug)
device_printf(sc->dev,
"Card at relative address %d deleted\n",
ivar->rca);
err = device_delete_child(sc->dev, sc->child_list[i]);
if (err != 0) {
j++;
if (final == false)
continue;
else
break;
}
free(ivar, M_DEVBUF);
}
sc->child_count = j;
mmc_update_child_list(sc);
return (err);
}
static void
mmc_go_discovery(struct mmc_softc *sc)
{
uint32_t ocr;
device_t dev;
int err;
dev = sc->dev;
if (mmcbr_get_power_mode(dev) != power_on) {
/*
* First, try SD modes
*/
sc->squelched++; /* Errors are expected, squelch reporting. */
mmcbr_set_mode(dev, mode_sd);
mmc_power_up(sc);
mmcbr_set_bus_mode(dev, pushpull);
if (bootverbose || mmc_debug)
device_printf(sc->dev, "Probing bus\n");
mmc_idle_cards(sc);
err = mmc_send_if_cond(sc, 1);
if ((bootverbose || mmc_debug) && err == 0)
device_printf(sc->dev,
"SD 2.0 interface conditions: OK\n");
if (mmc_send_app_op_cond(sc, 0, &ocr) != MMC_ERR_NONE) {
if (bootverbose || mmc_debug)
device_printf(sc->dev, "SD probe: failed\n");
/*
* Failed, try MMC
*/
mmcbr_set_mode(dev, mode_mmc);
if (mmc_send_op_cond(sc, 0, &ocr) != MMC_ERR_NONE) {
if (bootverbose || mmc_debug)
device_printf(sc->dev,
"MMC probe: failed\n");
ocr = 0; /* Failed both, powerdown. */
} else if (bootverbose || mmc_debug)
device_printf(sc->dev,
"MMC probe: OK (OCR: 0x%08x)\n", ocr);
} else if (bootverbose || mmc_debug)
device_printf(sc->dev, "SD probe: OK (OCR: 0x%08x)\n",
ocr);
sc->squelched--;
mmcbr_set_ocr(dev, mmc_select_vdd(sc, ocr));
if (mmcbr_get_ocr(dev) != 0)
mmc_idle_cards(sc);
} else {
mmcbr_set_bus_mode(dev, opendrain);
mmcbr_set_clock(dev, SD_MMC_CARD_ID_FREQUENCY);
mmcbr_update_ios(dev);
/* XXX recompute vdd based on new cards? */
}
/*
* Make sure that we have a mutually agreeable voltage to at least
* one card on the bus.
*/
if (bootverbose || mmc_debug)
device_printf(sc->dev, "Current OCR: 0x%08x\n",
mmcbr_get_ocr(dev));
if (mmcbr_get_ocr(dev) == 0) {
device_printf(sc->dev, "No compatible cards found on bus\n");
(void)mmc_delete_cards(sc, false);
mmc_power_down(sc);
return;
}
/*
* Reselect the cards after we've idled them above.
*/
if (mmcbr_get_mode(dev) == mode_sd) {
err = mmc_send_if_cond(sc, 1);
mmc_send_app_op_cond(sc,
(err ? 0 : MMC_OCR_CCS) | mmcbr_get_ocr(dev), NULL);
} else
mmc_send_op_cond(sc, MMC_OCR_CCS | mmcbr_get_ocr(dev), NULL);
mmc_discover_cards(sc);
mmc_rescan_cards(sc);
mmcbr_set_bus_mode(dev, pushpull);
mmcbr_update_ios(dev);
mmc_calculate_clock(sc);
}
static int
mmc_calculate_clock(struct mmc_softc *sc)
{
device_t dev;
struct mmc_ivars *ivar;
int i;
uint32_t dtr, max_dtr;
uint16_t rca;
enum mmc_bus_timing max_timing, timing;
bool changed, hs400;
dev = sc->dev;
max_dtr = mmcbr_get_f_max(dev);
max_timing = bus_timing_max;
do {
changed = false;
for (i = 0; i < sc->child_count; i++) {
ivar = device_get_ivars(sc->child_list[i]);
if (isclr(&ivar->timings, max_timing) ||
!mmc_host_timing(dev, max_timing)) {
for (timing = max_timing - 1; timing >=
bus_timing_normal; timing--) {
if (isset(&ivar->timings, timing) &&
mmc_host_timing(dev, timing)) {
max_timing = timing;
break;
}
}
changed = true;
}
dtr = mmc_timing_to_dtr(ivar, max_timing);
if (dtr < max_dtr) {
max_dtr = dtr;
changed = true;
}
}
} while (changed == true);
if (bootverbose || mmc_debug) {
device_printf(dev,
"setting transfer rate to %d.%03dMHz (%s timing)\n",
max_dtr / 1000000, (max_dtr / 1000) % 1000,
mmc_timing_to_string(max_timing));
}
/*
* HS400 must be tuned in HS200 mode, so in case of HS400 we begin
* with HS200 following the sequence as described in "6.6.2.2 HS200
* timing mode selection" of the eMMC specification v5.1, too, and
* switch to max_timing later. HS400ES requires no tuning and, thus,
* can be switch to directly, but requires the same detour via high
* speed mode as does HS400 (see mmc_switch_to_hs400()).
*/
hs400 = max_timing == bus_timing_mmc_hs400;
timing = hs400 == true ? bus_timing_mmc_hs200 : max_timing;
for (i = 0; i < sc->child_count; i++) {
ivar = device_get_ivars(sc->child_list[i]);
if ((ivar->timings & ~(1 << bus_timing_normal)) == 0)
continue;
rca = ivar->rca;
if (mmc_select_card(sc, rca) != MMC_ERR_NONE) {
device_printf(dev, "Card at relative address %d "
"failed to select\n", rca);
continue;
}
if (timing == bus_timing_mmc_hs200 || /* includes HS400 */
timing == bus_timing_mmc_hs400es) {
if (mmc_set_vccq(sc, ivar, timing) != MMC_ERR_NONE) {
device_printf(dev, "Failed to set VCCQ for "
"card at relative address %d\n", rca);
continue;
}
}
if (timing == bus_timing_mmc_hs200) { /* includes HS400 */
/* Set bus width (required for initial tuning). */
if (mmc_set_card_bus_width(sc, ivar, timing) !=
MMC_ERR_NONE) {
device_printf(dev, "Card at relative address "
"%d failed to set bus width\n", rca);
continue;
}
mmcbr_set_bus_width(dev, ivar->bus_width);
mmcbr_update_ios(dev);
} else if (timing == bus_timing_mmc_hs400es) {
if (mmc_switch_to_hs400(sc, ivar, max_dtr, timing) !=
MMC_ERR_NONE) {
device_printf(dev, "Card at relative address "
"%d failed to set %s timing\n", rca,
mmc_timing_to_string(timing));
continue;
}
goto power_class;
}
if (mmc_set_timing(sc, ivar, timing) != MMC_ERR_NONE) {
device_printf(dev, "Card at relative address %d "
"failed to set %s timing\n", rca,
mmc_timing_to_string(timing));
continue;
}
if (timing == bus_timing_mmc_ddr52) {
/*
* Set EXT_CSD_BUS_WIDTH_n_DDR in EXT_CSD_BUS_WIDTH
* (must be done after switching to EXT_CSD_HS_TIMING).
*/
if (mmc_set_card_bus_width(sc, ivar, timing) !=
MMC_ERR_NONE) {
device_printf(dev, "Card at relative address "
"%d failed to set bus width\n", rca);
continue;
}
mmcbr_set_bus_width(dev, ivar->bus_width);
mmcbr_update_ios(dev);
if (mmc_set_vccq(sc, ivar, timing) != MMC_ERR_NONE) {
device_printf(dev, "Failed to set VCCQ for "
"card at relative address %d\n", rca);
continue;
}
}
/* Set clock (must be done before initial tuning). */
mmcbr_set_clock(dev, max_dtr);
mmcbr_update_ios(dev);
if (mmcbr_tune(dev, hs400) != 0) {
device_printf(dev, "Card at relative address %d "
"failed to execute initial tuning\n", rca);
continue;
}
if (hs400 == true && mmc_switch_to_hs400(sc, ivar, max_dtr,
max_timing) != MMC_ERR_NONE) {
device_printf(dev, "Card at relative address %d "
"failed to set %s timing\n", rca,
mmc_timing_to_string(max_timing));
continue;
}
power_class:
if (mmc_set_power_class(sc, ivar) != MMC_ERR_NONE) {
device_printf(dev, "Card at relative address %d "
"failed to set power class\n", rca);
}
}
(void)mmc_select_card(sc, 0);
return (max_dtr);
}
/*
* Switch from HS200 to HS400 (either initially or for re-tuning) or directly
* to HS400ES. This follows the sequences described in "6.6.2.3 HS400 timing
* mode selection" of the eMMC specification v5.1.
*/
static int
mmc_switch_to_hs400(struct mmc_softc *sc, struct mmc_ivars *ivar,
uint32_t clock, enum mmc_bus_timing max_timing)
{
device_t dev;
int err;
uint16_t rca;
dev = sc->dev;
rca = ivar->rca;
/*
* Both clock and timing must be set as appropriate for high speed
* before eventually switching to HS400/HS400ES; mmc_set_timing()
* will issue mmcbr_update_ios().
*/
mmcbr_set_clock(dev, ivar->hs_tran_speed);
err = mmc_set_timing(sc, ivar, bus_timing_hs);
if (err != MMC_ERR_NONE)
return (err);
/*
* Set EXT_CSD_BUS_WIDTH_8_DDR in EXT_CSD_BUS_WIDTH (and additionally
* EXT_CSD_BUS_WIDTH_ES for HS400ES).
*/
err = mmc_set_card_bus_width(sc, ivar, max_timing);
if (err != MMC_ERR_NONE)
return (err);
mmcbr_set_bus_width(dev, ivar->bus_width);
mmcbr_update_ios(dev);
/* Finally, switch to HS400/HS400ES mode. */
err = mmc_set_timing(sc, ivar, max_timing);
if (err != MMC_ERR_NONE)
return (err);
mmcbr_set_clock(dev, clock);
mmcbr_update_ios(dev);
return (MMC_ERR_NONE);
}
/*
* Switch from HS400 to HS200 (for re-tuning).
*/
static int
mmc_switch_to_hs200(struct mmc_softc *sc, struct mmc_ivars *ivar,
uint32_t clock)
{
device_t dev;
int err;
uint16_t rca;
dev = sc->dev;
rca = ivar->rca;
/*
* Both clock and timing must initially be set as appropriate for
* DDR52 before eventually switching to HS200; mmc_set_timing()
* will issue mmcbr_update_ios().
*/
mmcbr_set_clock(dev, ivar->hs_tran_speed);
err = mmc_set_timing(sc, ivar, bus_timing_mmc_ddr52);
if (err != MMC_ERR_NONE)
return (err);
/*
* Next, switch to high speed. Thus, clear EXT_CSD_BUS_WIDTH_n_DDR
* in EXT_CSD_BUS_WIDTH and update bus width and timing in ios.
*/
err = mmc_set_card_bus_width(sc, ivar, bus_timing_hs);
if (err != MMC_ERR_NONE)
return (err);
mmcbr_set_bus_width(dev, ivar->bus_width);
mmcbr_set_timing(sc->dev, bus_timing_hs);
mmcbr_update_ios(dev);
/* Finally, switch to HS200 mode. */
err = mmc_set_timing(sc, ivar, bus_timing_mmc_hs200);
if (err != MMC_ERR_NONE)
return (err);
mmcbr_set_clock(dev, clock);
mmcbr_update_ios(dev);
return (MMC_ERR_NONE);
}
static int
mmc_retune(device_t busdev, device_t dev, bool reset)
{
struct mmc_softc *sc;
struct mmc_ivars *ivar;
int err;
uint32_t clock;
enum mmc_bus_timing timing;
if (device_get_parent(dev) != busdev)
return (MMC_ERR_INVALID);
sc = device_get_softc(busdev);
if (sc->retune_needed != 1 && sc->retune_paused != 0)
return (MMC_ERR_INVALID);
timing = mmcbr_get_timing(busdev);
if (timing == bus_timing_mmc_hs400) {
/*
* Controllers use the data strobe line to latch data from
* the devices in HS400 mode so periodic re-tuning isn't
* expected to be required, i. e. only if a CRC or tuning
* error is signaled to the bridge. In these latter cases
* we are asked to reset the tuning circuit and need to do
* the switch timing dance.
*/
if (reset == false)
return (0);
ivar = device_get_ivars(dev);
clock = mmcbr_get_clock(busdev);
if (mmc_switch_to_hs200(sc, ivar, clock) != MMC_ERR_NONE)
return (MMC_ERR_BADCRC);
}
err = mmcbr_retune(busdev, reset);
if (err != 0 && timing == bus_timing_mmc_hs400)
return (MMC_ERR_BADCRC);
switch (err) {
case 0:
break;
case EIO:
return (MMC_ERR_FAILED);
default:
return (MMC_ERR_INVALID);
}
if (timing == bus_timing_mmc_hs400) {
if (mmc_switch_to_hs400(sc, ivar, clock, timing) !=
MMC_ERR_NONE)
return (MMC_ERR_BADCRC);
}
return (MMC_ERR_NONE);
}
static void
mmc_retune_pause(device_t busdev, device_t dev, bool retune)
{
struct mmc_softc *sc;
sc = device_get_softc(busdev);
KASSERT(device_get_parent(dev) == busdev,
("%s: %s is not a child of %s", __func__, device_get_nameunit(dev),
device_get_nameunit(busdev)));
KASSERT(sc->owner != NULL,
("%s: Request from %s without bus being acquired.", __func__,
device_get_nameunit(dev)));
if (retune == true && sc->retune_paused == 0)
sc->retune_needed = 1;
sc->retune_paused++;
}
static void
mmc_retune_unpause(device_t busdev, device_t dev)
{
struct mmc_softc *sc;
sc = device_get_softc(busdev);
KASSERT(device_get_parent(dev) == busdev,
("%s: %s is not a child of %s", __func__, device_get_nameunit(dev),
device_get_nameunit(busdev)));
KASSERT(sc->owner != NULL,
("%s: Request from %s without bus being acquired.", __func__,
device_get_nameunit(dev)));
KASSERT(sc->retune_paused != 0,
("%s: Re-tune pause count already at 0", __func__));
sc->retune_paused--;
}
static void
mmc_scan(struct mmc_softc *sc)
{
device_t dev = sc->dev;
int err;
err = mmc_acquire_bus(dev, dev);
if (err != 0) {
device_printf(dev, "Failed to acquire bus for scanning\n");
return;
}
mmc_go_discovery(sc);
err = mmc_release_bus(dev, dev);
if (err != 0) {
device_printf(dev, "Failed to release bus after scanning\n");
return;
}
(void)bus_generic_attach(dev);
}
static int
mmc_read_ivar(device_t bus, device_t child, int which, uintptr_t *result)
{
struct mmc_ivars *ivar = device_get_ivars(child);
switch (which) {
default:
return (EINVAL);
case MMC_IVAR_SPEC_VERS:
*result = ivar->csd.spec_vers;
break;
case MMC_IVAR_DSR_IMP:
*result = ivar->csd.dsr_imp;
break;
case MMC_IVAR_MEDIA_SIZE:
*result = ivar->sec_count;
break;
case MMC_IVAR_RCA:
*result = ivar->rca;
break;
case MMC_IVAR_SECTOR_SIZE:
*result = MMC_SECTOR_SIZE;
break;
case MMC_IVAR_TRAN_SPEED:
*result = mmcbr_get_clock(bus);
break;
case MMC_IVAR_READ_ONLY:
*result = ivar->read_only;
break;
case MMC_IVAR_HIGH_CAP:
*result = ivar->high_cap;
break;
case MMC_IVAR_CARD_TYPE:
*result = ivar->mode;
break;
case MMC_IVAR_BUS_WIDTH:
*result = ivar->bus_width;
break;
case MMC_IVAR_ERASE_SECTOR:
*result = ivar->erase_sector;
break;
case MMC_IVAR_MAX_DATA:
*result = mmcbr_get_max_data(bus);
break;
case MMC_IVAR_CMD6_TIMEOUT:
*result = ivar->cmd6_time;
break;
case MMC_IVAR_QUIRKS:
*result = ivar->quirks;
break;
case MMC_IVAR_CARD_ID_STRING:
*(char **)result = ivar->card_id_string;
break;
case MMC_IVAR_CARD_SN_STRING:
*(char **)result = ivar->card_sn_string;
break;
}
return (0);
}
static int
mmc_write_ivar(device_t bus, device_t child, int which, uintptr_t value)
{
/*
* None are writable ATM
*/
return (EINVAL);
}
static void
mmc_delayed_attach(void *xsc)
{
struct mmc_softc *sc = xsc;
mmc_scan(sc);
config_intrhook_disestablish(&sc->config_intrhook);
}
static int
mmc_child_location_str(device_t dev, device_t child, char *buf,
size_t buflen)
{
snprintf(buf, buflen, "rca=0x%04x", mmc_get_rca(child));
return (0);
}
static device_method_t mmc_methods[] = {
/* device_if */
DEVMETHOD(device_probe, mmc_probe),
DEVMETHOD(device_attach, mmc_attach),
DEVMETHOD(device_detach, mmc_detach),
DEVMETHOD(device_suspend, mmc_suspend),
DEVMETHOD(device_resume, mmc_resume),
/* Bus interface */
DEVMETHOD(bus_read_ivar, mmc_read_ivar),
DEVMETHOD(bus_write_ivar, mmc_write_ivar),
DEVMETHOD(bus_child_location_str, mmc_child_location_str),
/* MMC Bus interface */
DEVMETHOD(mmcbus_retune_pause, mmc_retune_pause),
DEVMETHOD(mmcbus_retune_unpause, mmc_retune_unpause),
DEVMETHOD(mmcbus_wait_for_request, mmc_wait_for_request),
DEVMETHOD(mmcbus_acquire_bus, mmc_acquire_bus),
DEVMETHOD(mmcbus_release_bus, mmc_release_bus),
DEVMETHOD_END
};
driver_t mmc_driver = {
"mmc",
mmc_methods,
sizeof(struct mmc_softc),
};
devclass_t mmc_devclass;
MODULE_VERSION(mmc, MMC_VERSION);
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