diff options
author | Pierre Ossman <drzeus@drzeus.cx> | 2008-08-31 15:22:46 (GMT) |
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committer | Pierre Ossman <drzeus@drzeus.cx> | 2008-10-12 09:04:34 (GMT) |
commit | d16f57700475f670ca2828c150a34fa7102a05fc (patch) | |
tree | 81d7e341fb4cdeb17b2ba2beddd5bc7b5d5dbd46 /drivers/mmc/core | |
parent | 08846698703dedae6c6915eb4b4d0a36188c5635 (diff) | |
download | linux-fsl-qoriq-d16f57700475f670ca2828c150a34fa7102a05fc.tar.xz |
sdio: high-speed support
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
Diffstat (limited to 'drivers/mmc/core')
-rw-r--r-- | drivers/mmc/core/sdio.c | 52 |
1 files changed, 49 insertions, 3 deletions
diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c index 4eab79e..fb99ccf 100644 --- a/drivers/mmc/core/sdio.c +++ b/drivers/mmc/core/sdio.c @@ -165,6 +165,36 @@ static int sdio_enable_wide(struct mmc_card *card) } /* + * 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. */ static void mmc_sdio_remove(struct mmc_host *host) @@ -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). |