sdio_ops.c

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/*
 *  linux/drivers/mmc/sdio_ops.c
 *
 *  Copyright 2006-2007 Pierre Ossman
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 */

#include <linux/scatterlist.h>

#include <linux/mmc/host.h>
#include <linux/mmc/card.h>
#include <linux/mmc/mmc.h>
#include <linux/mmc/sdio.h>

#include "core.h"
#include "sdio_ops.h"

int mmc_send_io_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
{
    struct mmc_command cmd = {0};
    int i, err = 0;

    BUG_ON(!host);

    cmd.opcode = SD_IO_SEND_OP_COND;
    cmd.arg = ocr;
    cmd.flags = MMC_RSP_SPI_R4 | MMC_RSP_R4 | MMC_CMD_BCR;

    for (i = 100; i; i--) {
        err = mmc_wait_for_cmd(host, &cmd, MMC_CMD_RETRIES);
        if (err)
            break;

        /* if we're just probing, do a single pass */
        if (ocr == 0)
            break;

        /* otherwise wait until reset completes */
        if (mmc_host_is_spi(host)) {
            /*
             * Both R1_SPI_IDLE and MMC_CARD_BUSY indicate
             * an initialized card under SPI, but some cards
             * (Marvell's) only behave when looking at this
             * one.
             */
            if (cmd.resp[1] & MMC_CARD_BUSY)
                break;
        } else {
            if (cmd.resp[0] & MMC_CARD_BUSY)
                break;
        }

        err = -ETIMEDOUT;

        mmc_delay(10);
    }

    if (rocr)
        *rocr = cmd.resp[mmc_host_is_spi(host) ? 1 : 0];

    return err;
}

static int mmc_io_rw_direct_host(struct mmc_host *host, int write, unsigned fn,
    unsigned addr, u8 in, u8 *out)
{
    struct mmc_command cmd = {0};
    int err;

    BUG_ON(!host);
    BUG_ON(fn > 7);

    /* sanity check */
    if (addr & ~0x1FFFF)
        return -EINVAL;

    cmd.opcode = SD_IO_RW_DIRECT;
    cmd.arg = write ? 0x80000000 : 0x00000000;
    cmd.arg |= fn << 28;
    cmd.arg |= (write && out) ? 0x08000000 : 0x00000000;
    cmd.arg |= addr << 9;
    cmd.arg |= in;
    cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_AC;

    err = mmc_wait_for_cmd(host, &cmd, 0);
    if (err)
        return err;

    if (mmc_host_is_spi(host)) {
        /* host driver already reported errors */
    } else {
        if (cmd.resp[0] & R5_ERROR)
            return -EIO;
        if (cmd.resp[0] & R5_FUNCTION_NUMBER)
            return -EINVAL;
        if (cmd.resp[0] & R5_OUT_OF_RANGE)
            return -ERANGE;
    }

    if (out) {
        if (mmc_host_is_spi(host))
            *out = (cmd.resp[0] >> 8) & 0xFF;
        else
            *out = cmd.resp[0] & 0xFF;
    }

    return 0;
}

int mmc_io_rw_direct(struct mmc_card *card, int write, unsigned fn,
    unsigned addr, u8 in, u8 *out)
{
    BUG_ON(!card);
    return mmc_io_rw_direct_host(card->host, write, fn, addr, in, out);
}

int mmc_io_rw_extended(struct mmc_card *card, int write, unsigned fn,
    unsigned addr, int incr_addr, u8 *buf, unsigned blocks, unsigned blksz)
{
    struct mmc_request mrq = {NULL};
    struct mmc_command cmd = {0};
    struct mmc_data data = {0};
    struct scatterlist sg;

    BUG_ON(!card);
    BUG_ON(fn > 7);
    WARN_ON(blksz == 0);

    /* sanity check */
    if (addr & ~0x1FFFF)
        return -EINVAL;

    mrq.cmd = &cmd;
    mrq.data = &data;

    cmd.opcode = SD_IO_RW_EXTENDED;
    cmd.arg = write ? 0x80000000 : 0x00000000;
    cmd.arg |= fn << 28;
    cmd.arg |= incr_addr ? 0x04000000 : 0x00000000;
    cmd.arg |= addr << 9;
    if (blocks == 0)
        cmd.arg |= (blksz == 512) ? 0 : blksz;  /* byte mode */
    else
        cmd.arg |= 0x08000000 | blocks;     /* block mode */
    cmd.flags = MMC_RSP_SPI_R5 | MMC_RSP_R5 | MMC_CMD_ADTC;

    data.blksz = blksz;
    /* Code in host drivers/fwk assumes that "blocks" always is >=1 */
    data.blocks = blocks ? blocks : 1;
    data.flags = write ? MMC_DATA_WRITE : MMC_DATA_READ;
    data.sg = &sg;
    data.sg_len = 1;

    sg_init_one(&sg, buf, data.blksz * data.blocks);

    mmc_set_data_timeout(&data, card);

    mmc_wait_for_req(card->host, &mrq);

    if (cmd.error)
        return cmd.error;
    if (data.error)
        return data.error;

    if (mmc_host_is_spi(card->host)) {
        /* host driver already reported errors */
    } else {
        if (cmd.resp[0] & R5_ERROR)
            return -EIO;
        if (cmd.resp[0] & R5_FUNCTION_NUMBER)
            return -EINVAL;
        if (cmd.resp[0] & R5_OUT_OF_RANGE)
            return -ERANGE;
    }

    return 0;
}

int sdio_reset(struct mmc_host *host)
{
    int ret;
    u8 abort;

    /* SDIO Simplified Specification V2.0, 4.4 Reset for SDIO */

    ret = mmc_io_rw_direct_host(host, 0, 0, SDIO_CCCR_ABORT, 0, &abort);
    if (ret)
        abort = 0x08;
    else
        abort |= 0x08;

    ret = mmc_io_rw_direct_host(host, 1, 0, SDIO_CCCR_ABORT, abort, NULL);
    return ret;
}