40fab6e7c7
device attach time. We may need to read this more often in the future, but for now simplicity of implementation wins. Submitted by: mav@
799 lines
20 KiB
C
799 lines
20 KiB
C
/*-
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* Copyright (c) 2006 Bernd Walter. All rights reserved.
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* Copyright (c) 2006 M. Warner Losh. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* Portions of this software may have been developed with reference to
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* the SD Simplified Specification. The following disclaimer may apply:
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*
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* The following conditions apply to the release of the simplified
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* specification ("Simplified Specification") by the SD Card Association and
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* the SD Group. The Simplified Specification is a subset of the complete SD
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* Specification which is owned by the SD Card Association and the SD
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* Group. This Simplified Specification is provided on a non-confidential
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* basis subject to the disclaimers below. Any implementation of the
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* Simplified Specification may require a license from the SD Card
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* Association, SD Group, SD-3C LLC or other third parties.
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*
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* Disclaimers:
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*
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* The information contained in the Simplified Specification is presented only
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* as a standard specification for SD Cards and SD Host/Ancillary products and
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* is provided "AS-IS" without any representations or warranties of any
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* kind. No responsibility is assumed by the SD Group, SD-3C LLC or the SD
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* Card Association for any damages, any infringements of patents or other
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* right of the SD Group, SD-3C LLC, the SD Card Association or any third
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* parties, which may result from its use. No license is granted by
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* implication, estoppel or otherwise under any patent or other rights of the
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* SD Group, SD-3C LLC, the SD Card Association or any third party. Nothing
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* herein shall be construed as an obligation by the SD Group, the SD-3C LLC
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* or the SD Card Association to disclose or distribute any technical
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* information, know-how or other confidential information to any third party.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/lock.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/bus.h>
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#include <dev/mmc/mmcreg.h>
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#include <dev/mmc/mmcbrvar.h>
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#include <dev/mmc/mmcvar.h>
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#include "mmcbr_if.h"
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#include "mmcbus_if.h"
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struct mmc_softc {
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device_t dev;
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struct mtx sc_mtx;
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struct intr_config_hook config_intrhook;
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device_t owner;
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uint32_t last_rca;
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};
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/*
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* Per-card data
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*/
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struct mmc_ivars {
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uint32_t raw_cid[4]; /* Raw bits of the CID */
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uint32_t raw_csd[4]; /* Raw bits of the CSD */
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uint16_t rca;
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enum mmc_card_mode mode;
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struct mmc_cid cid; /* cid decoded */
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struct mmc_csd csd; /* csd decoded */
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u_char read_only; /* True when the device is read-only */
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};
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#define CMD_RETRIES 3
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/* bus entry points */
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static int mmc_probe(device_t dev);
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static int mmc_attach(device_t dev);
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static int mmc_detach(device_t dev);
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#define MMC_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx)
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#define MMC_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx)
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#define MMC_LOCK_INIT(_sc) \
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mtx_init(&_sc->sc_mtx, device_get_nameunit(_sc->dev), \
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"mmc", MTX_DEF)
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#define MMC_LOCK_DESTROY(_sc) mtx_destroy(&_sc->sc_mtx);
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#define MMC_ASSERT_LOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_OWNED);
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#define MMC_ASSERT_UNLOCKED(_sc) mtx_assert(&_sc->sc_mtx, MA_NOTOWNED);
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static void mmc_delayed_attach(void *);
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static int mmc_wait_for_cmd(struct mmc_softc *sc, struct mmc_command *cmd,
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int retries);
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static int mmc_wait_for_command(struct mmc_softc *sc, uint32_t opcode,
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uint32_t arg, uint32_t flags, uint32_t *resp, int retries);
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static void
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mmc_ms_delay(int ms)
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{
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DELAY(1000 * ms); /* XXX BAD */
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}
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static int
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mmc_probe(device_t dev)
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{
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device_set_desc(dev, "MMC/SD bus");
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return (0);
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}
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static int
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mmc_attach(device_t dev)
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{
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struct mmc_softc *sc;
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sc = device_get_softc(dev);
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sc->dev = dev;
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MMC_LOCK_INIT(sc);
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/* We'll probe and attach our children later, but before / mount */
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sc->config_intrhook.ich_func = mmc_delayed_attach;
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sc->config_intrhook.ich_arg = sc;
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if (config_intrhook_establish(&sc->config_intrhook) != 0)
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device_printf(dev, "config_intrhook_establish failed\n");
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return (0);
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}
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static int
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mmc_detach(device_t dev)
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{
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struct mmc_softc *sc = device_get_softc(dev);
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device_t *kids;
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int i, nkid;
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/* kill children [ph33r]. -sorbo */
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if (device_get_children(sc->dev, &kids, &nkid) != 0)
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return 0;
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for (i = 0; i < nkid; i++) {
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device_t kid = kids[i];
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void *ivar = device_get_ivars(kid);
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device_detach(kid);
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device_delete_child(sc->dev, kid);
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free(ivar, M_DEVBUF);
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}
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free(kids, M_TEMP);
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MMC_LOCK_DESTROY(sc);
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return 0;
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}
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static int
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mmc_acquire_bus(device_t busdev, device_t dev)
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{
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struct mmc_softc *sc;
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int err;
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int rca;
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err = MMCBR_ACQUIRE_HOST(device_get_parent(busdev), dev);
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if (err)
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return (err);
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sc = device_get_softc(busdev);
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MMC_LOCK(sc);
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if (sc->owner)
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panic("mmc: host bridge didn't seralize us.");
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sc->owner = dev;
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MMC_UNLOCK(sc);
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if (busdev != dev) {
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// Keep track of the last rca that we've selected. If
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// we're asked to do it again, don't. We never unselect
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// unless the bus code itself wants the mmc bus.
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rca = mmc_get_rca(dev);
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if (sc->last_rca != rca) {
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mmc_wait_for_command(sc, MMC_SELECT_CARD, rca << 16,
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MMC_RSP_R1 | MMC_CMD_AC, NULL, CMD_RETRIES);
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sc->last_rca = rca;
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}
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// XXX should set bus width here?
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} else {
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// If there's a card selected, stand down.
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if (sc->last_rca != 0) {
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mmc_wait_for_command(sc, MMC_SELECT_CARD, 0,
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MMC_RSP_R1 | MMC_CMD_AC, NULL, CMD_RETRIES);
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sc->last_rca = 0;
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}
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// XXX should set bus width here?
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}
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return (0);
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}
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static int
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mmc_release_bus(device_t busdev, device_t dev)
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{
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struct mmc_softc *sc;
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int err;
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sc = device_get_softc(busdev);
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MMC_LOCK(sc);
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if (!sc->owner)
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panic("mmc: releasing unowned bus.");
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if (sc->owner != dev)
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panic("mmc: you don't own the bus. game over.");
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MMC_UNLOCK(sc);
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err = MMCBR_RELEASE_HOST(device_get_parent(busdev), dev);
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if (err)
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return (err);
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MMC_LOCK(sc);
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sc->owner = NULL;
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MMC_UNLOCK(sc);
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return (0);
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}
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static void
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mmc_rescan_cards(struct mmc_softc *sc)
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{
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/* XXX: Look at the children and see if they respond to status */
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}
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static uint32_t
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mmc_select_vdd(struct mmc_softc *sc, uint32_t ocr)
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{
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return ocr & MMC_OCR_VOLTAGE;
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}
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static int
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mmc_highest_voltage(uint32_t ocr)
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{
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int i;
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for (i = 30; i >= 0; i--)
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if (ocr & (1 << i))
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return i;
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return (-1);
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}
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static void
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mmc_wakeup(struct mmc_request *req)
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{
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struct mmc_softc *sc;
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// printf("Wakeup for req %p done_data %p\n", req, req->done_data);
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sc = (struct mmc_softc *)req->done_data;
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MMC_LOCK(sc);
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req->flags |= MMC_REQ_DONE;
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wakeup(req);
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MMC_UNLOCK(sc);
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}
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static int
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mmc_wait_for_req(struct mmc_softc *sc, struct mmc_request *req)
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{
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int err;
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req->done = mmc_wakeup;
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req->done_data = sc;
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// printf("Submitting request %p sc %p\n", req, sc);
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MMCBR_REQUEST(device_get_parent(sc->dev), sc->dev, req);
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MMC_LOCK(sc);
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do {
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err = msleep(req, &sc->sc_mtx, PZERO | PCATCH, "mmcreq",
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hz / 10);
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} while (!(req->flags & MMC_REQ_DONE) && err == EAGAIN);
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// printf("Request %p done with error %d\n", req, err);
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MMC_UNLOCK(sc);
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return (err);
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}
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static int
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mmc_wait_for_request(device_t brdev, device_t reqdev, struct mmc_request *req)
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{
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struct mmc_softc *sc = device_get_softc(brdev);
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return mmc_wait_for_req(sc, req);
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}
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static int
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mmc_wait_for_cmd(struct mmc_softc *sc, struct mmc_command *cmd, int retries)
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{
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struct mmc_request mreq;
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memset(&mreq, 0, sizeof(mreq));
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memset(cmd->resp, 0, sizeof(cmd->resp));
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cmd->retries = retries;
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cmd->data = NULL;
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mreq.cmd = cmd;
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// printf("CMD: %x ARG %x\n", cmd->opcode, cmd->arg);
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mmc_wait_for_req(sc, &mreq);
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return (cmd->error);
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}
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static int
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mmc_wait_for_app_cmd(struct mmc_softc *sc, uint32_t rca,
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struct mmc_command *cmd, int retries)
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{
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struct mmc_command appcmd;
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int err = MMC_ERR_NONE, i;
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for (i = 0; i <= retries; i++) {
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appcmd.opcode = MMC_APP_CMD;
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appcmd.arg = rca << 16;
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appcmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
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mmc_wait_for_cmd(sc, &appcmd, 0);
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err = appcmd.error;
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if (err != MMC_ERR_NONE)
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continue;
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if (!(appcmd.resp[0] & R1_APP_CMD))
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return MMC_ERR_FAILED;
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mmc_wait_for_cmd(sc, cmd, 0);
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err = cmd->error;
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if (err == MMC_ERR_NONE)
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break;
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}
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return (err);
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}
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static int
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mmc_wait_for_command(struct mmc_softc *sc, uint32_t opcode,
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uint32_t arg, uint32_t flags, uint32_t *resp, int retries)
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{
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struct mmc_command cmd;
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int err;
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memset(&cmd, 0, sizeof(cmd));
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cmd.opcode = opcode;
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cmd.arg = arg;
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cmd.flags = flags;
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err = mmc_wait_for_cmd(sc, &cmd, retries);
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if (err)
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return (err);
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if (cmd.error)
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return (cmd.error);
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if (resp) {
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if (flags & MMC_RSP_136)
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memcpy(resp, cmd.resp, 4 * sizeof(uint32_t));
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else
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*resp = cmd.resp[0];
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}
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return (0);
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}
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static void
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mmc_idle_cards(struct mmc_softc *sc)
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{
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device_t dev;
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struct mmc_command cmd;
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dev = sc->dev;
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mmcbr_set_chip_select(dev, cs_high);
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mmcbr_update_ios(dev);
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mmc_ms_delay(1);
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memset(&cmd, 0, sizeof(cmd));
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cmd.opcode = MMC_GO_IDLE_STATE;
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cmd.arg = 0;
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cmd.flags = MMC_RSP_NONE | MMC_CMD_BC;
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mmc_wait_for_cmd(sc, &cmd, 0);
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mmc_ms_delay(1);
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mmcbr_set_chip_select(dev, cs_dontcare);
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mmcbr_update_ios(dev);
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mmc_ms_delay(1);
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}
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static int
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mmc_send_app_op_cond(struct mmc_softc *sc, uint32_t ocr, uint32_t *rocr)
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{
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struct mmc_command cmd;
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int err = MMC_ERR_NONE, i;
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memset(&cmd, 0, sizeof(cmd));
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cmd.opcode = ACMD_SD_SEND_OP_COND;
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cmd.arg = ocr;
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cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR;
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for (i = 0; i < 100; i++) {
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err = mmc_wait_for_app_cmd(sc, 0, &cmd, CMD_RETRIES);
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if (err != MMC_ERR_NONE)
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break;
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if ((cmd.resp[0] & MMC_OCR_CARD_BUSY) || ocr == 0)
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break;
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err = MMC_ERR_TIMEOUT;
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mmc_ms_delay(10);
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}
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if (rocr && err == MMC_ERR_NONE)
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*rocr = cmd.resp[0];
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return err;
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}
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static int
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mmc_send_op_cond(struct mmc_softc *sc, uint32_t ocr, uint32_t *rocr)
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{
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struct mmc_command cmd;
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int err = MMC_ERR_NONE, i;
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memset(&cmd, 0, sizeof(cmd));
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cmd.opcode = MMC_SEND_OP_COND;
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cmd.arg = ocr;
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cmd.flags = MMC_RSP_R3 | MMC_CMD_BCR;
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for (i = 0; i < 100; i++) {
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err = mmc_wait_for_cmd(sc, &cmd, CMD_RETRIES);
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if (err != MMC_ERR_NONE)
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break;
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if ((cmd.resp[0] & MMC_OCR_CARD_BUSY) || ocr == 0)
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break;
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err = MMC_ERR_TIMEOUT;
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mmc_ms_delay(10);
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}
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if (rocr && err == MMC_ERR_NONE)
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*rocr = cmd.resp[0];
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return err;
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}
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|
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static void
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mmc_power_up(struct mmc_softc *sc)
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{
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device_t dev;
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dev = sc->dev;
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mmcbr_set_vdd(dev, mmc_highest_voltage(mmcbr_get_host_ocr(dev)));
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mmcbr_set_bus_mode(dev, opendrain);
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mmcbr_set_chip_select(dev, cs_dontcare);
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mmcbr_set_bus_width(dev, bus_width_1);
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mmcbr_set_power_mode(dev, power_up);
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mmcbr_set_clock(dev, 0);
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mmcbr_update_ios(dev);
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mmc_ms_delay(1);
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mmcbr_set_clock(dev, mmcbr_get_f_min(sc->dev));
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mmcbr_set_power_mode(dev, power_on);
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mmcbr_update_ios(dev);
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mmc_ms_delay(2);
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}
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// I wonder if the following is endian safe.
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static uint32_t
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mmc_get_bits(uint32_t *bits, int start, int size)
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{
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const int i = 3 - (start / 32);
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const int shift = start & 31;
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uint32_t retval = bits[i] >> shift;
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if (size + shift > 32)
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retval |= bits[i - 1] << (32 - shift);
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return retval & ((1 << size) - 1);
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}
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static void
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mmc_decode_cid(int is_sd, uint32_t *raw_cid, struct mmc_cid *cid)
|
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{
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int i;
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memset(cid, 0, sizeof(*cid));
|
|
if (is_sd) {
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/* There's no version info, so we take it on faith */
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cid->mid = mmc_get_bits(raw_cid, 120, 8);
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cid->oid = mmc_get_bits(raw_cid, 104, 16);
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for (i = 0; i < 5; i++)
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cid->pnm[i] = mmc_get_bits(raw_cid, 96 - i * 8, 8);
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cid->prv = mmc_get_bits(raw_cid, 56, 8);
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cid->psn = mmc_get_bits(raw_cid, 24, 32);
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cid->mdt_year = mmc_get_bits(raw_cid, 12, 8) + 2001;
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cid->mdt_month = mmc_get_bits(raw_cid, 8, 4);
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} else {
|
|
// XXX write me
|
|
panic("write mmc cid decoder");
|
|
}
|
|
}
|
|
|
|
static const int exp[8] = {
|
|
1, 10, 100, 1000, 10000, 100000, 1000000, 10000000
|
|
};
|
|
static const int mant[16] = {
|
|
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 void
|
|
mmc_decode_csd(int is_sd, uint32_t *raw_csd, struct mmc_csd *csd)
|
|
{
|
|
int v;
|
|
int m;
|
|
int e;
|
|
|
|
memset(csd, 0, sizeof(*csd));
|
|
if (is_sd) {
|
|
csd->csd_structure = v = mmc_get_bits(raw_csd, 126, 2);
|
|
if (v == 0) {
|
|
m = mmc_get_bits(raw_csd, 115, 4);
|
|
e = mmc_get_bits(raw_csd, 112, 3);
|
|
csd->tacc = exp[e] * mant[m] + 9 / 10;
|
|
csd->nsac = mmc_get_bits(raw_csd, 104, 8) * 100;
|
|
m = mmc_get_bits(raw_csd, 99, 4);
|
|
e = mmc_get_bits(raw_csd, 96, 3);
|
|
csd->tran_speed = exp[e] * 10000 * mant[m];
|
|
csd->ccc = mmc_get_bits(raw_csd, 84, 12);
|
|
csd->read_bl_len = 1 << mmc_get_bits(raw_csd, 80, 4);
|
|
csd->read_bl_partial = mmc_get_bits(raw_csd, 79, 1);
|
|
csd->write_blk_misalign = mmc_get_bits(raw_csd, 78, 1);
|
|
csd->read_blk_misalign = mmc_get_bits(raw_csd, 77, 1);
|
|
csd->dsr_imp = mmc_get_bits(raw_csd, 76, 1);
|
|
csd->vdd_r_curr_min = cur_min[mmc_get_bits(raw_csd, 59, 3)];
|
|
csd->vdd_r_curr_max = cur_max[mmc_get_bits(raw_csd, 56, 3)];
|
|
csd->vdd_w_curr_min = cur_min[mmc_get_bits(raw_csd, 53, 3)];
|
|
csd->vdd_w_curr_max = cur_max[mmc_get_bits(raw_csd, 50, 3)];
|
|
m = mmc_get_bits(raw_csd, 62, 12);
|
|
e = mmc_get_bits(raw_csd, 47, 3);
|
|
csd->capacity = ((1 + m) << (e + 2)) * csd->read_bl_len;
|
|
csd->erase_blk_en = mmc_get_bits(raw_csd, 46, 1);
|
|
csd->sector_size = mmc_get_bits(raw_csd, 39, 7);
|
|
csd->wp_grp_size = mmc_get_bits(raw_csd, 32, 7);
|
|
csd->wp_grp_enable = mmc_get_bits(raw_csd, 31, 1);
|
|
csd->r2w_factor = 1 << mmc_get_bits(raw_csd, 26, 3);
|
|
csd->write_bl_len = 1 << mmc_get_bits(raw_csd, 22, 4);
|
|
csd->write_bl_partial = mmc_get_bits(raw_csd, 21, 1);
|
|
} else if (v == 1) {
|
|
panic("Write SDHC CSD parser");
|
|
} else
|
|
panic("unknown SD CSD version");
|
|
} else {
|
|
panic("Write a MMC CSD parser");
|
|
}
|
|
}
|
|
|
|
static int
|
|
mmc_all_send_cid(struct mmc_softc *sc, uint32_t *rawcid)
|
|
{
|
|
struct mmc_command cmd;
|
|
int err;
|
|
|
|
cmd.opcode = MMC_ALL_SEND_CID;
|
|
cmd.arg = 0;
|
|
cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
|
|
err = mmc_wait_for_cmd(sc, &cmd, 0);
|
|
memcpy(rawcid, cmd.resp, 4 * sizeof(uint32_t));
|
|
return (err);
|
|
}
|
|
|
|
static int
|
|
mmc_send_csd(struct mmc_softc *sc, uint16_t rca, uint32_t *rawcid)
|
|
{
|
|
struct mmc_command cmd;
|
|
int err;
|
|
|
|
cmd.opcode = MMC_SEND_CSD;
|
|
cmd.arg = rca << 16;
|
|
cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
|
|
err = mmc_wait_for_cmd(sc, &cmd, 0);
|
|
memcpy(rawcid, cmd.resp, 4 * sizeof(uint32_t));
|
|
return (err);
|
|
}
|
|
|
|
static int
|
|
mmc_send_relative_addr(struct mmc_softc *sc, uint32_t *resp)
|
|
{
|
|
struct mmc_command cmd;
|
|
int err;
|
|
|
|
cmd.opcode = SD_SEND_RELATIVE_ADDR;
|
|
cmd.arg = 0;
|
|
cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
|
|
err = mmc_wait_for_cmd(sc, &cmd, 0);
|
|
*resp = cmd.resp[0];
|
|
return (err);
|
|
}
|
|
|
|
static void
|
|
mmc_discover_cards(struct mmc_softc *sc)
|
|
{
|
|
struct mmc_ivars *ivar;
|
|
int err;
|
|
uint32_t resp;
|
|
device_t child;
|
|
|
|
while (1) {
|
|
ivar = malloc(sizeof(struct mmc_ivars), M_DEVBUF, M_WAITOK);
|
|
if (!ivar)
|
|
return;
|
|
err = mmc_all_send_cid(sc, ivar->raw_cid);
|
|
if (err == MMC_ERR_TIMEOUT)
|
|
break;
|
|
if (err != MMC_ERR_NONE) {
|
|
printf("Error reading CID %d\n", err);
|
|
break;
|
|
}
|
|
if (mmcbr_get_mode(sc->dev) == mode_sd) {
|
|
ivar->mode = mode_sd;
|
|
mmc_decode_cid(1, ivar->raw_cid, &ivar->cid);
|
|
mmc_send_relative_addr(sc, &resp);
|
|
ivar->rca = resp >> 16;
|
|
if (mmcbr_get_ro(sc->dev))
|
|
ivar->read_only = 1;
|
|
mmc_send_csd(sc, ivar->rca, ivar->raw_csd);
|
|
mmc_decode_csd(1, ivar->raw_csd, &ivar->csd);
|
|
printf("SD CARD: %lld bytes\n", (long long)
|
|
ivar->csd.capacity);
|
|
child = device_add_child(sc->dev, NULL, -1);
|
|
device_set_ivars(child, ivar);
|
|
return;
|
|
}
|
|
panic("Write MMC card code here");
|
|
}
|
|
free(ivar, M_DEVBUF);
|
|
}
|
|
|
|
static void
|
|
mmc_go_discovery(struct mmc_softc *sc)
|
|
{
|
|
uint32_t ocr;
|
|
device_t dev;
|
|
|
|
dev = sc->dev;
|
|
if (mmcbr_get_power_mode(dev) != power_on) {
|
|
// First, try SD modes
|
|
mmcbr_set_mode(dev, mode_sd);
|
|
mmc_power_up(sc);
|
|
mmcbr_set_bus_mode(dev, pushpull);
|
|
mmc_idle_cards(sc);
|
|
if (mmc_send_app_op_cond(sc, 0, &ocr) != MMC_ERR_NONE) {
|
|
// Failed, try MMC
|
|
mmcbr_set_mode(dev, mode_mmc);
|
|
if (mmc_send_op_cond(sc, 0, &ocr) != MMC_ERR_NONE)
|
|
return; // Failed both, punt! XXX power down?
|
|
}
|
|
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, mmcbr_get_f_min(dev));
|
|
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 (mmcbr_get_ocr(dev) == 0)
|
|
return;
|
|
/*
|
|
* Reselect the cards after we've idled them above.
|
|
*/
|
|
if (mmcbr_get_mode(dev) == mode_sd)
|
|
mmc_send_app_op_cond(sc, mmcbr_get_ocr(dev), NULL);
|
|
else
|
|
mmc_send_op_cond(sc, mmcbr_get_ocr(dev), NULL);
|
|
mmc_discover_cards(sc);
|
|
|
|
mmcbr_set_bus_mode(dev, pushpull);
|
|
mmcbr_update_ios(dev);
|
|
bus_generic_attach(dev);
|
|
// mmc_update_children_sysctl(dev);
|
|
}
|
|
|
|
static int
|
|
mmc_calculate_clock(struct mmc_softc *sc)
|
|
{
|
|
int max_dtr = 0;
|
|
int nkid, i, f_min, f_max;
|
|
device_t *kids;
|
|
|
|
f_min = mmcbr_get_f_min(sc->dev);
|
|
f_max = mmcbr_get_f_max(sc->dev);
|
|
max_dtr = f_max;
|
|
if (device_get_children(sc->dev, &kids, &nkid) != 0)
|
|
panic("can't get children");
|
|
for (i = 0; i < nkid; i++)
|
|
if (mmc_get_tran_speed(kids[i]) < max_dtr)
|
|
max_dtr = mmc_get_tran_speed(kids[i]);
|
|
free(kids, M_TEMP);
|
|
device_printf(sc->dev, "setting transfer rate to %d.%03dMHz\n",
|
|
max_dtr / 1000000, (max_dtr / 1000) % 1000);
|
|
return max_dtr;
|
|
}
|
|
|
|
static void
|
|
mmc_scan(struct mmc_softc *sc)
|
|
{
|
|
device_t dev;
|
|
|
|
dev = sc->dev;
|
|
mmc_acquire_bus(dev, dev);
|
|
|
|
if (mmcbr_get_power_mode(dev) == power_on)
|
|
mmc_rescan_cards(sc);
|
|
mmc_go_discovery(sc);
|
|
mmcbr_set_clock(dev, mmc_calculate_clock(sc));
|
|
mmcbr_update_ios(dev);
|
|
|
|
mmc_release_bus(dev, dev);
|
|
// XXX probe/attach/detach children?
|
|
}
|
|
|
|
static int
|
|
mmc_read_ivar(device_t bus, device_t child, int which, u_char *result)
|
|
{
|
|
struct mmc_ivars *ivar = device_get_ivars(child);
|
|
|
|
switch (which) {
|
|
default:
|
|
return (EINVAL);
|
|
case MMC_IVAR_DSR_IMP:
|
|
*(int *)result = ivar->csd.dsr_imp;
|
|
break;
|
|
case MMC_IVAR_MEDIA_SIZE:
|
|
*(int *)result = ivar->csd.capacity;
|
|
break;
|
|
case MMC_IVAR_RCA:
|
|
*(int *)result = ivar->rca;
|
|
break;
|
|
case MMC_IVAR_SECTOR_SIZE:
|
|
*(int *)result = 512;
|
|
break;
|
|
case MMC_IVAR_TRAN_SPEED:
|
|
*(int *)result = ivar->csd.tran_speed;
|
|
break;
|
|
case MMC_IVAR_READ_ONLY:
|
|
*(int *)result = ivar->read_only;
|
|
break;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
mmc_write_ivar(device_t bus, device_t child, int which, uintptr_t value)
|
|
{
|
|
// None are writable ATM
|
|
switch (which) {
|
|
default:
|
|
return (EINVAL);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
|
|
static void
|
|
mmc_delayed_attach(void *xsc)
|
|
{
|
|
struct mmc_softc *sc = xsc;
|
|
|
|
mmc_scan(sc);
|
|
config_intrhook_disestablish(&sc->config_intrhook);
|
|
}
|
|
|
|
static device_method_t mmc_methods[] = {
|
|
/* device_if */
|
|
DEVMETHOD(device_probe, mmc_probe),
|
|
DEVMETHOD(device_attach, mmc_attach),
|
|
DEVMETHOD(device_detach, mmc_detach),
|
|
|
|
/* Bus interface */
|
|
DEVMETHOD(bus_read_ivar, mmc_read_ivar),
|
|
DEVMETHOD(bus_write_ivar, mmc_write_ivar),
|
|
|
|
/* MMC Bus interface */
|
|
DEVMETHOD(mmcbus_wait_for_request, mmc_wait_for_request),
|
|
DEVMETHOD(mmcbus_acquire_bus, mmc_acquire_bus),
|
|
DEVMETHOD(mmcbus_release_bus, mmc_release_bus),
|
|
|
|
{0, 0},
|
|
};
|
|
|
|
static driver_t mmc_driver = {
|
|
"mmc",
|
|
mmc_methods,
|
|
sizeof(struct mmc_softc),
|
|
};
|
|
static devclass_t mmc_devclass;
|
|
|
|
|
|
DRIVER_MODULE(mmc, at91_mci, mmc_driver, mmc_devclass, 0, 0);
|
|
DRIVER_MODULE(mmc, sdh, mmc_driver, mmc_devclass, 0, 0);
|