a97fc401cf
"br" or "bridge" where - according to the terminology outlined in comments of bridge.h and mmcbr_if.m around since their addition in r163516 - the bus is meant and used instead. Some of these instances are also rather old, while those in e. g. mmc_subr.c are as new as r315430 and were caused by choosing mmc_wait_for_request(), i. e. the one pre-r315430 outliner existing in mmc.c, as template for function parameters in mmc_subr.c inadvertently. This correction translates to renaming "brdev" to "busdev" and "mmcbr" to "mmcbus" respectively as appropriate. While at it, also rename "reqdev" to just "dev" in mmc_subr.[c,h] for consistency with was already used in mmm.c pre-r315430, again modulo mmc_wait_for_request() that is. - Remove comment lines from bridge.h incorrectly suggesting that there would be a MMC bridge base class driver. - Update comments in bridge.h regarding the star topology of SD and SDIO; since version 3.00 of the SDHCI specification, for eSD and eSDIO bus topologies are actually possible in form of so called "shared buses" (in some subcontext later on renamed to "embedded" buses).
265 lines
8.1 KiB
C
265 lines
8.1 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/lock.h>
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#include <sys/mutex.h>
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#include <sys/time.h>
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#include <dev/mmc/bridge.h>
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#include <dev/mmc/mmc_private.h>
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#include <dev/mmc/mmc_subr.h>
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#include <dev/mmc/mmcreg.h>
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#include <dev/mmc/mmcbrvar.h>
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#include "mmcbus_if.h"
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#define CMD_RETRIES 3
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#define LOG_PPS 5 /* Log no more than 5 errors per second. */
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int
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mmc_wait_for_cmd(device_t busdev, device_t dev, struct mmc_command *cmd,
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int retries)
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{
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struct mmc_request mreq;
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struct mmc_softc *sc;
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int err;
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do {
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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 = 0; /* Retries done here, not in hardware. */
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cmd->mrq = &mreq;
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if (cmd->data != NULL)
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cmd->data->mrq = &mreq;
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mreq.cmd = cmd;
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if (MMCBUS_WAIT_FOR_REQUEST(busdev, dev, &mreq) != 0)
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err = MMC_ERR_FAILED;
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else
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err = cmd->error;
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} while (err != MMC_ERR_NONE && retries-- > 0);
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if (err != MMC_ERR_NONE && busdev == dev) {
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sc = device_get_softc(busdev);
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if (sc->squelched == 0 && ppsratecheck(&sc->log_time,
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&sc->log_count, LOG_PPS)) {
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device_printf(sc->dev, "CMD%d failed, RESULT: %d\n",
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cmd->opcode, err);
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}
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}
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return (err);
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}
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int
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mmc_wait_for_app_cmd(device_t busdev, device_t dev, uint16_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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struct mmc_softc *sc;
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int err;
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sc = device_get_softc(busdev);
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/* Squelch error reporting at lower levels, we report below. */
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sc->squelched++;
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do {
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memset(&appcmd, 0, sizeof(appcmd));
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appcmd.opcode = MMC_APP_CMD;
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appcmd.arg = (uint32_t)rca << 16;
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appcmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
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if (mmc_wait_for_cmd(busdev, dev, &appcmd, 0) != 0)
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err = MMC_ERR_FAILED;
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else
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err = appcmd.error;
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if (err == MMC_ERR_NONE) {
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if (!(appcmd.resp[0] & R1_APP_CMD))
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err = MMC_ERR_FAILED;
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else if (mmc_wait_for_cmd(busdev, dev, cmd, 0) != 0)
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err = MMC_ERR_FAILED;
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else
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err = cmd->error;
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}
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} while (err != MMC_ERR_NONE && retries-- > 0);
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sc->squelched--;
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if (err != MMC_ERR_NONE && busdev == dev) {
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if (sc->squelched == 0 && ppsratecheck(&sc->log_time,
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&sc->log_count, LOG_PPS)) {
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device_printf(sc->dev, "ACMD%d failed, RESULT: %d\n",
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cmd->opcode, err);
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}
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}
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return (err);
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}
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int
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mmc_switch(device_t busdev, device_t dev, uint16_t rca, uint8_t set,
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uint8_t index, uint8_t value, u_int timeout, bool status)
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{
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struct mmc_command cmd;
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struct mmc_softc *sc;
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int err;
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KASSERT(timeout != 0, ("%s: no timeout", __func__));
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sc = device_get_softc(busdev);
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memset(&cmd, 0, sizeof(cmd));
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cmd.opcode = MMC_SWITCH_FUNC;
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cmd.arg = (MMC_SWITCH_FUNC_WR << 24) | (index << 16) | (value << 8) |
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set;
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/*
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* If the hardware supports busy detection but the switch timeout
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* exceeds the maximum host timeout, use a R1 instead of a R1B
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* response in order to keep the hardware from timing out.
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*/
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if (mmcbr_get_caps(busdev) & MMC_CAP_WAIT_WHILE_BUSY &&
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timeout > mmcbr_get_max_busy_timeout(busdev))
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cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
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else
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cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
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/*
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* Pause re-tuning so it won't interfere with the busy state and also
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* so that the result of CMD13 will always refer to switching rather
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* than to a tuning command that may have snuck in between.
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*/
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sc->retune_paused++;
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err = mmc_wait_for_cmd(busdev, dev, &cmd, CMD_RETRIES);
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if (err != MMC_ERR_NONE || status == false)
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goto out;
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err = mmc_switch_status(busdev, dev, rca, timeout);
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out:
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sc->retune_paused--;
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return (err);
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}
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int
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mmc_switch_status(device_t busdev, device_t dev, uint16_t rca, u_int timeout)
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{
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struct timeval cur, end;
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int err;
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uint32_t status;
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KASSERT(timeout != 0, ("%s: no timeout", __func__));
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/*
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* Note that when using a R1B response in mmc_switch(), bridges of
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* type MMC_CAP_WAIT_WHILE_BUSY will issue mmc_send_status() only
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* once and then exit the loop.
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*/
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end.tv_sec = end.tv_usec = 0;
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for (;;) {
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err = mmc_send_status(busdev, dev, rca, &status);
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if (err != MMC_ERR_NONE)
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break;
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if (R1_CURRENT_STATE(status) == R1_STATE_TRAN)
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break;
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getmicrouptime(&cur);
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if (end.tv_sec == 0 && end.tv_usec == 0) {
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end.tv_usec = timeout;
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timevaladd(&end, &cur);
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}
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if (timevalcmp(&cur, &end, >)) {
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err = MMC_ERR_TIMEOUT;
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break;
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}
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}
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if (err == MMC_ERR_NONE && (status & R1_SWITCH_ERROR) != 0)
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return (MMC_ERR_FAILED);
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return (err);
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}
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int
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mmc_send_ext_csd(device_t busdev, device_t dev, uint8_t *rawextcsd)
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{
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struct mmc_command cmd;
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struct mmc_data data;
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int err;
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memset(&cmd, 0, sizeof(cmd));
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memset(&data, 0, sizeof(data));
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memset(rawextcsd, 0, MMC_EXTCSD_SIZE);
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cmd.opcode = MMC_SEND_EXT_CSD;
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cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
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cmd.data = &data;
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data.data = rawextcsd;
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data.len = MMC_EXTCSD_SIZE;
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data.flags = MMC_DATA_READ;
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err = mmc_wait_for_cmd(busdev, dev, &cmd, CMD_RETRIES);
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return (err);
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}
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int
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mmc_send_status(device_t busdev, device_t dev, uint16_t rca, uint32_t *status)
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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 = MMC_SEND_STATUS;
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cmd.arg = (uint32_t)rca << 16;
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cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
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err = mmc_wait_for_cmd(busdev, dev, &cmd, CMD_RETRIES);
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*status = cmd.resp[0];
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return (err);
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}
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