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mmc: Add new API call 'sdio_reset_comm' for resetting communication with an SDIO device

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Signed-off-by: San Mehat <san@android.com>
This commit is contained in:
San Mehat 2008-05-15 09:15:37 -07:00 committed by Colin Cross
parent 4748cba95d
commit 35fe42ee47
1 changed files with 57 additions and 0 deletions
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57
drivers/mmc/core/sdio.c
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@ -1221,3 +1221,60 @@ int mmc_attach_sdio(struct mmc_host *host)
return err;
}
int sdio_reset_comm(struct mmc_card *card)
{
struct mmc_host *host = card->host;
u32 ocr;
int err;
printk("%s():\n", __func__);
mmc_go_idle(host);
mmc_set_clock(host, host->f_min);
err = mmc_send_io_op_cond(host, 0, &ocr);
if (err)
goto err;
host->ocr = mmc_select_voltage(host, ocr);
if (!host->ocr) {
err = -EINVAL;
goto err;
}
err = mmc_send_io_op_cond(host, host->ocr, &ocr);
if (err)
goto err;
if (mmc_host_is_spi(host)) {
err = mmc_spi_set_crc(host, use_spi_crc);
if (err)
goto err;
}
if (!mmc_host_is_spi(host)) {
err = mmc_send_relative_addr(host, &card->rca);
if (err)
goto err;
mmc_set_bus_mode(host, MMC_BUSMODE_PUSHPULL);
}
if (!mmc_host_is_spi(host)) {
err = mmc_select_card(card);
if (err)
goto err;
}
mmc_set_clock(host, card->cis.max_dtr);
err = sdio_enable_wide(card);
if (err)
goto err;
return 0;
err:
printk("%s: Error resetting SDIO communications (%d)\n",
mmc_hostname(host), err);
return err;
}
EXPORT_SYMBOL(sdio_reset_comm);