/*-
 * Copyright (c) 2006 Bernd Walter.  All rights reserved.
 * Copyright (c) 2006 M. Warner Losh <imp@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/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/mutex.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 "mmcbus_if.h"

#define CMD_RETRIES     3
#define LOG_PPS         5 /* Log no more than 5 errors per second. */

int
mmc_wait_for_cmd(device_t busdev, device_t dev, struct mmc_command *cmd,
    int retries)
{
        struct mmc_request mreq;
        struct mmc_softc *sc;
        int err;

        do {
                memset(&mreq, 0, sizeof(mreq));
                memset(cmd->resp, 0, sizeof(cmd->resp));
                cmd->retries = 0; /* Retries done here, not in hardware. */
                cmd->mrq = &mreq;
                if (cmd->data != NULL)
                        cmd->data->mrq = &mreq;
                mreq.cmd = cmd;
                if (MMCBUS_WAIT_FOR_REQUEST(busdev, dev, &mreq) != 0)
                        err = MMC_ERR_FAILED;
                else
                        err = cmd->error;
        } while (err != MMC_ERR_NONE && retries-- > 0);

        if (err != MMC_ERR_NONE && busdev == dev) {
                sc = device_get_softc(busdev);
                if (sc->squelched == 0 && ppsratecheck(&sc->log_time,
                    &sc->log_count, LOG_PPS)) {
                        device_printf(sc->dev, "CMD%d failed, RESULT: %d\n",
                            cmd->opcode, err);
                }
        }

        return (err);
}

int
mmc_wait_for_app_cmd(device_t busdev, device_t dev, uint16_t rca,
    struct mmc_command *cmd, int retries)
{
        struct mmc_command appcmd;
        struct mmc_softc *sc;
        int err;

        sc = device_get_softc(busdev);

        cmd->flags |= MMC_CMD_IS_APP;

        /* Squelch error reporting at lower levels, we report below. */
        sc->squelched++;
        do {
                memset(&appcmd, 0, sizeof(appcmd));
                appcmd.opcode = MMC_APP_CMD;
                appcmd.arg = (uint32_t)rca << 16;
                appcmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
                if (mmc_wait_for_cmd(busdev, dev, &appcmd, 0) != 0)
                        err = MMC_ERR_FAILED;
                else
                        err = appcmd.error;
                if (err == MMC_ERR_NONE) {
                        if (!(appcmd.resp[0] & R1_APP_CMD))
                                err = MMC_ERR_FAILED;
                        else if (mmc_wait_for_cmd(busdev, dev, cmd, 0) != 0)
                                err = MMC_ERR_FAILED;
                        else
                                err = cmd->error;
                }
        } while (err != MMC_ERR_NONE && retries-- > 0);
        sc->squelched--;

        if (err != MMC_ERR_NONE && busdev == dev) {
                if (sc->squelched == 0 && ppsratecheck(&sc->log_time,
                    &sc->log_count, LOG_PPS)) {
                        device_printf(sc->dev, "ACMD%d failed, RESULT: %d\n",
                            cmd->opcode, err);
                }
        }

        return (err);
}

int
mmc_switch(device_t busdev, device_t dev, uint16_t rca, uint8_t set,
    uint8_t index, uint8_t value, u_int timeout, bool status)
{
        struct mmc_command cmd;
        struct mmc_softc *sc;
        int err;

        KASSERT(timeout != 0, ("%s: no timeout", __func__));

        sc = device_get_softc(busdev);

        memset(&cmd, 0, sizeof(cmd));
        cmd.opcode = MMC_SWITCH_FUNC;
        cmd.arg = (MMC_SWITCH_FUNC_WR << 24) | (index << 16) | (value << 8) |
            set;
        /*
         * If the hardware supports busy detection but the switch timeout
         * exceeds the maximum host timeout, use a R1 instead of a R1B
         * response in order to keep the hardware from timing out.
         */
        if (mmcbr_get_caps(busdev) & MMC_CAP_WAIT_WHILE_BUSY &&
            timeout > mmcbr_get_max_busy_timeout(busdev))
                cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
        else
                cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
        /*
         * Pause re-tuning so it won't interfere with the busy state and also
         * so that the result of CMD13 will always refer to switching rather
         * than to a tuning command that may have snuck in between.
         */
        sc->retune_paused++;
        err = mmc_wait_for_cmd(busdev, dev, &cmd, CMD_RETRIES);
        if (err != MMC_ERR_NONE || status == false)
                goto out;
        err = mmc_switch_status(busdev, dev, rca, timeout);
out:
        sc->retune_paused--;
        return (err);
}

int
mmc_switch_status(device_t busdev, device_t dev, uint16_t rca, u_int timeout)
{
        struct timeval cur, end;
        int err, crc_timeout;
        uint32_t status;

        KASSERT(timeout != 0, ("%s: no timeout", __func__));

        /*
         * Note that when using a R1B response in mmc_switch(), bridges of
         * type MMC_CAP_WAIT_WHILE_BUSY will issue mmc_send_status() only
         * once and then exit the loop.
         */
        end.tv_sec = end.tv_usec = 0;
        for (;;) {
                crc_timeout=0;
                do {
                        /*
                         * CRC errors indicate that the command wasn't accepted
                         * and executed due to a communications error. Retry
                         * CRC errors a couple of times to cope with transient
                         * failures.
                         *
                         * This is required for some cheap laptops to boot.
                         */
                        err = mmc_send_status(busdev, dev, rca, &status);
                        crc_timeout++;
                } while (err == MMC_ERR_BADCRC && crc_timeout < 10);
                if (err != MMC_ERR_NONE)
                        break;
                if (R1_CURRENT_STATE(status) == R1_STATE_TRAN)
                        break;
                getmicrouptime(&cur);
                if (end.tv_sec == 0 && end.tv_usec == 0) {
                        end.tv_usec = timeout;
                        timevaladd(&end, &cur);
                }
                if (timevalcmp(&cur, &end, >)) {
                        err = MMC_ERR_TIMEOUT;
                        break;
                }
        }
        if (err == MMC_ERR_NONE && (status & R1_SWITCH_ERROR) != 0)
                return (MMC_ERR_FAILED);
        return (err);
}

int
mmc_send_ext_csd(device_t busdev, device_t dev, uint8_t *rawextcsd)
{
        struct mmc_command cmd;
        struct mmc_data data;
        int err;

        memset(&cmd, 0, sizeof(cmd));
        memset(&data, 0, sizeof(data));

        memset(rawextcsd, 0, MMC_EXTCSD_SIZE);
        cmd.opcode = MMC_SEND_EXT_CSD;
        cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
        cmd.data = &data;

        data.data = rawextcsd;
        data.len = MMC_EXTCSD_SIZE;
        data.flags = MMC_DATA_READ;

        err = mmc_wait_for_cmd(busdev, dev, &cmd, CMD_RETRIES);
        return (err);
}

int
mmc_send_status(device_t busdev, device_t dev, uint16_t rca, uint32_t *status)
{
        struct mmc_command cmd;
        int err;

        memset(&cmd, 0, sizeof(cmd));
        cmd.opcode = MMC_SEND_STATUS;
        cmd.arg = (uint32_t)rca << 16;
        cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
        err = mmc_wait_for_cmd(busdev, dev, &cmd, CMD_RETRIES);
        *status = cmd.resp[0];
        return (err);
}