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| author | Jaehoon Chung <jh80.chung@samsung.com> | 2011-02-24 13:46:11 +0900 |
|---|---|---|
| committer | Chris Ball <cjb@laptop.org> | 2011-03-15 13:51:47 -0400 |
| commit | 41babf753cc82ab6208903625a084bf305c32d06 (patch) | |
| tree | 1418a029223084fc3860a64683b3a65b0baeec0a /drivers/mmc | |
| parent | e7054ba1f73c0a0e2489251499bdbc21b88b4190 (diff) | |
| download | linux-41babf753cc82ab6208903625a084bf305c32d06.tar.gz linux-41babf753cc82ab6208903625a084bf305c32d06.tar.bz2 linux-41babf753cc82ab6208903625a084bf305c32d06.zip | |
mmc: dw_mmc: support DDR mode
This patch adds DDR mode support to dw_mmc.
If we set any bit in UHS_REG bit[16:31], the card of that slot is
supported for DDR mode. For example, if UHS_REG[16] is set, card
number 0 is DDR mode.
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Will Newton <will.newton@imgtec.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/host/dw_mmc.c | 8 | ||||
| -rw-r--r-- | drivers/mmc/host/dw_mmc.h | 2 |
2 files changed, 9 insertions, 1 deletions
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index 62c8440ff04b..58476c1bb056 100644 --- a/drivers/mmc/host/dw_mmc.c +++ b/drivers/mmc/host/dw_mmc.c @@ -662,6 +662,7 @@ static void dw_mci_request(struct mmc_host *mmc, struct mmc_request *mrq) static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) { struct dw_mci_slot *slot = mmc_priv(mmc); + u32 regs; /* set default 1 bit mode */ slot->ctype = SDMMC_CTYPE_1BIT; @@ -678,6 +679,13 @@ static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) break; } + /* DDR mode set */ + if (ios->ddr) { + regs = mci_readl(slot->host, UHS_REG); + regs |= (0x1 << slot->id) << 16; + mci_writel(slot->host, UHS_REG, regs); + } + if (ios->clock) { /* * Use mirror of ios->clock to prevent race with mmc diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h index 5dd55a75233d..23c662af5616 100644 --- a/drivers/mmc/host/dw_mmc.h +++ b/drivers/mmc/host/dw_mmc.h @@ -43,6 +43,7 @@ #define SDMMC_USRID 0x068 #define SDMMC_VERID 0x06c #define SDMMC_HCON 0x070 +#define SDMMC_UHS_REG 0x074 #define SDMMC_BMOD 0x080 #define SDMMC_PLDMND 0x084 #define SDMMC_DBADDR 0x088 @@ -51,7 +52,6 @@ #define SDMMC_DSCADDR 0x094 #define SDMMC_BUFADDR 0x098 #define SDMMC_DATA 0x100 -#define SDMMC_DATA_ADR 0x100 /* shift bit field */ #define _SBF(f, v) ((v) << (f)) |