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sdio: high-speed support

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Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
This commit is contained in:
Pierre Ossman 2008-08-31 17:22:46 +02:00
parent 0884669870
commit d16f577004
1 changed files with 49 additions and 3 deletions
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52
drivers/mmc/core/sdio.c
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@ -164,6 +164,36 @@ static int sdio_enable_wide(struct mmc_card *card)
return 0;
}
/*
* Test if the card supports high-speed mode and, if so, switch to it.
*/
static int sdio_enable_hs(struct mmc_card *card)
{
int ret;
u8 speed;
if (!(card->host->caps & MMC_CAP_SD_HIGHSPEED))
return 0;
if (!card->cccr.high_speed)
return 0;
ret = mmc_io_rw_direct(card, 0, 0, SDIO_CCCR_SPEED, 0, &speed);
if (ret)
return ret;
speed |= SDIO_SPEED_EHS;
ret = mmc_io_rw_direct(card, 1, 0, SDIO_CCCR_SPEED, speed, NULL);
if (ret)
return ret;
mmc_card_set_highspeed(card);
mmc_set_timing(card->host, MMC_TIMING_SD_HS);
return 0;
}
/*
* Host is being removed. Free up the current card.
*/
@ -333,10 +363,26 @@ int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
goto remove;
/*
* No support for high-speed yet, so just set
* the card's maximum speed.
* Switch to high-speed (if supported).
*/
mmc_set_clock(host, card->cis.max_dtr);
err = sdio_enable_hs(card);
if (err)
goto remove;
/*
* Change to the card's maximum speed.
*/
if (mmc_card_highspeed(card)) {
/*
* The SDIO specification doesn't mention how
* the CIS transfer speed register relates to
* high-speed, but it seems that 50 MHz is
* mandatory.
*/
mmc_set_clock(host, 50000000);
} else {
mmc_set_clock(host, card->cis.max_dtr);
}
/*
* Switch to wider bus (if supported).