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authorPhilip Rakity <prakity@marvell.com>2011-05-13 11:17:18 +0530
committerChris Ball <cjb@laptop.org>2011-05-24 23:53:58 -0400
commit4c4cb171054230c2e58ed6574d7faa1871c75bbe (patch)
tree8ba336234def08a99ae98d29047da69de41cdcb0 /drivers/mmc/core/mmc.c
parent261bbd463a091b939770255d559bbc89b1bad568 (diff)
mmc: core: add support for eMMC Dual Data Rate
eMMC voltage change not required for 1.8V. 3.3V and 1.8V vcc are capable of doing DDR. vccq of 1.8v is not required. Signed-off-by: Philip Rakity <prakity@marvell.com> Reviewed-by: Arindam Nath <arindam.nath@amd.com> Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc/core/mmc.c')
-rw-r--r--drivers/mmc/core/mmc.c35
1 files changed, 30 insertions, 5 deletions
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index a2c795e8f9d..0433fe66cba 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -20,6 +20,7 @@
#include "core.h"
#include "bus.h"
#include "mmc_ops.h"
+#include "sd_ops.h"
static const unsigned int tran_exp[] = {
10000, 100000, 1000000, 10000000,
@@ -633,10 +634,14 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
*/
if (mmc_card_highspeed(card)) {
if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_8V)
- && (host->caps & (MMC_CAP_1_8V_DDR)))
+ && ((host->caps & (MMC_CAP_1_8V_DDR |
+ MMC_CAP_UHS_DDR50))
+ == (MMC_CAP_1_8V_DDR | MMC_CAP_UHS_DDR50)))
ddr = MMC_1_8V_DDR_MODE;
else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
- && (host->caps & (MMC_CAP_1_2V_DDR)))
+ && ((host->caps & (MMC_CAP_1_2V_DDR |
+ MMC_CAP_UHS_DDR50))
+ == (MMC_CAP_1_2V_DDR | MMC_CAP_UHS_DDR50)))
ddr = MMC_1_2V_DDR_MODE;
}
@@ -670,8 +675,7 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
ext_csd_bits[idx][0],
0);
if (!err) {
- mmc_set_bus_width_ddr(card->host,
- bus_width, MMC_SDR_MODE);
+ mmc_set_bus_width(card->host, bus_width);
/*
* If controller can't handle bus width test,
* use the highest bus width to maintain
@@ -697,8 +701,29 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
1 << bus_width, ddr);
goto free_card;
} else if (ddr) {
+ /*
+ * eMMC cards can support 3.3V to 1.2V i/o (vccq)
+ * signaling.
+ *
+ * EXT_CSD_CARD_TYPE_DDR_1_8V means 3.3V or 1.8V vccq.
+ *
+ * 1.8V vccq at 3.3V core voltage (vcc) is not required
+ * in the JEDEC spec for DDR.
+ *
+ * Do not force change in vccq since we are obviously
+ * working and no change to vccq is needed.
+ *
+ * WARNING: eMMC rules are NOT the same as SD DDR
+ */
+ if (ddr == EXT_CSD_CARD_TYPE_DDR_1_2V) {
+ err = mmc_set_signal_voltage(host,
+ MMC_SIGNAL_VOLTAGE_120, 0);
+ if (err)
+ goto err;
+ }
mmc_card_set_ddr_mode(card);
- mmc_set_bus_width_ddr(card->host, bus_width, ddr);
+ mmc_set_timing(card->host, MMC_TIMING_UHS_DDR50);
+ mmc_set_bus_width(card->host, bus_width);
}
}