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mmc: support the DDR mode for eMMC

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Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Tested-by: Lukasz Majewski <l.majewski@samsung.com>
Acked-by: Lukasz Majewski <l.majewski@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
master
Jaehoon Chung 10 years ago committed by Minkyu Kang
parent 8caf46d189
commit d22e3d46a9
2 changed files with 20 additions and 3 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 16
      drivers/mmc/mmc.c
  2. 7
      include/mmc.h

16
drivers/mmc/mmc.c
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@ -158,6 +158,9 @@ int mmc_set_blocklen(struct mmc *mmc, int len)
{
struct mmc_cmd cmd;
if (mmc->card_caps & MMC_MODE_DDR_52MHz)
return 0;
cmd.cmdidx = MMC_CMD_SET_BLOCKLEN;
cmd.resp_type = MMC_RSP_R1;
cmd.cmdarg = len;
@ -514,10 +517,13 @@ static int mmc_change_freq(struct mmc *mmc)
return 0;
/* High Speed is set, there are two types: 52MHz and 26MHz */
if (cardtype & EXT_CSD_CARD_TYPE_52)
if (cardtype & EXT_CSD_CARD_TYPE_52) {
if (cardtype & EXT_CSD_CARD_TYPE_DDR_52)
mmc->card_caps |= MMC_MODE_DDR_52MHz;
mmc->card_caps |= MMC_MODE_HS_52MHz | MMC_MODE_HS;
else
} else {
mmc->card_caps |= MMC_MODE_HS;
}
return 0;
}
@ -1054,6 +1060,8 @@ static int mmc_startup(struct mmc *mmc)
/* An array of possible bus widths in order of preference */
static unsigned ext_csd_bits[] = {
EXT_CSD_DDR_BUS_WIDTH_8,
EXT_CSD_DDR_BUS_WIDTH_4,
EXT_CSD_BUS_WIDTH_8,
EXT_CSD_BUS_WIDTH_4,
EXT_CSD_BUS_WIDTH_1,
@ -1061,13 +1069,15 @@ static int mmc_startup(struct mmc *mmc)
/* An array to map CSD bus widths to host cap bits */
static unsigned ext_to_hostcaps[] = {
[EXT_CSD_DDR_BUS_WIDTH_4] = MMC_MODE_DDR_52MHz,
[EXT_CSD_DDR_BUS_WIDTH_8] = MMC_MODE_DDR_52MHz,
[EXT_CSD_BUS_WIDTH_4] = MMC_MODE_4BIT,
[EXT_CSD_BUS_WIDTH_8] = MMC_MODE_8BIT,
};
/* An array to map chosen bus width to an integer */
static unsigned widths[] = {
8, 4, 1,
8, 4, 8, 4, 1,
};
for (idx=0; idx < ARRAY_SIZE(ext_csd_bits); idx++) {

7
include/mmc.h
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@ -38,6 +38,7 @@
#define MMC_MODE_8BIT (1 << 3)
#define MMC_MODE_SPI (1 << 4)
#define MMC_MODE_HC (1 << 5)
#define MMC_MODE_DDR_52MHz (1 << 6)
#define SD_DATA_4BIT 0x00040000
@ -169,10 +170,16 @@
#define EXT_CSD_CARD_TYPE_26 (1 << 0) /* Card can run at 26MHz */
#define EXT_CSD_CARD_TYPE_52 (1 << 1) /* Card can run at 52MHz */
#define EXT_CSD_CARD_TYPE_DDR_1_8V (1 << 2)
#define EXT_CSD_CARD_TYPE_DDR_1_2V (1 << 3)
#define EXT_CSD_CARD_TYPE_DDR_52 (EXT_CSD_CARD_TYPE_DDR_1_8V \
| EXT_CSD_CARD_TYPE_DDR_1_2V)
#define EXT_CSD_BUS_WIDTH_1 0 /* Card is in 1 bit mode */
#define EXT_CSD_BUS_WIDTH_4 1 /* Card is in 4 bit mode */
#define EXT_CSD_BUS_WIDTH_8 2 /* Card is in 8 bit mode */
#define EXT_CSD_DDR_BUS_WIDTH_4 5 /* Card is in 4 bit DDR mode */
#define EXT_CSD_DDR_BUS_WIDTH_8 6 /* Card is in 8 bit DDR mode */
#define EXT_CSD_BOOT_ACK_ENABLE (1 << 6)
#define EXT_CSD_BOOT_PARTITION_ENABLE (1 << 3)

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