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mmc: MMC 4.4 DDR support
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Add support for Dual Data Rate MMC cards as defined in the 4.4
specification.

Signed-off-by: Hanumath Prasad <hanumath.prasad@stericsson.com>
Cc: linux-mmc@vger.kernel.org
Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Tested-by Zhangfei Gao <zhangfei.gao@marvell.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
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Hanumath Prasad authored and Chris Ball committed Oct 23, 2010
1 parent 99fc513 commit dfc13e8
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Showing 6 changed files with 60 additions and 6 deletions.
10 changes: 7 additions & 3 deletions drivers/mmc/card/block.c
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Original file line number Diff line number Diff line change
Expand Up @@ -373,7 +373,8 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *req)
readcmd = MMC_READ_SINGLE_BLOCK;
writecmd = MMC_WRITE_BLOCK;
}

if (mmc_card_ddr_mode(card))
brq.data.flags |= MMC_DDR_MODE;
if (rq_data_dir(req) == READ) {
brq.cmd.opcode = readcmd;
brq.data.flags |= MMC_DATA_READ;
Expand Down Expand Up @@ -655,8 +656,11 @@ mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card)
struct mmc_command cmd;
int err;

/* Block-addressed cards ignore MMC_SET_BLOCKLEN. */
if (mmc_card_blockaddr(card))
/*
* Block-addressed and ddr mode supported cards
* ignore MMC_SET_BLOCKLEN.
*/
if (mmc_card_blockaddr(card) || mmc_card_ddr_mode(card))
return 0;

mmc_claim_host(card->host);
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37 changes: 35 additions & 2 deletions drivers/mmc/core/mmc.c
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Original file line number Diff line number Diff line change
Expand Up @@ -258,6 +258,21 @@ static int mmc_read_ext_csd(struct mmc_card *card)
}

switch (ext_csd[EXT_CSD_CARD_TYPE] & EXT_CSD_CARD_TYPE_MASK) {
case EXT_CSD_CARD_TYPE_DDR_52 | EXT_CSD_CARD_TYPE_52 |
EXT_CSD_CARD_TYPE_26:
card->ext_csd.hs_max_dtr = 52000000;
card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_52;
break;
case EXT_CSD_CARD_TYPE_DDR_1_2V | EXT_CSD_CARD_TYPE_52 |
EXT_CSD_CARD_TYPE_26:
card->ext_csd.hs_max_dtr = 52000000;
card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_2V;
break;
case EXT_CSD_CARD_TYPE_DDR_1_8V | EXT_CSD_CARD_TYPE_52 |
EXT_CSD_CARD_TYPE_26:
card->ext_csd.hs_max_dtr = 52000000;
card->ext_csd.card_type = EXT_CSD_CARD_TYPE_DDR_1_8V;
break;
case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
card->ext_csd.hs_max_dtr = 52000000;
break;
Expand Down Expand Up @@ -502,6 +517,18 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,

mmc_set_clock(host, max_dtr);

/*
* Activate DDR50 mode (if supported).
*/
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)))
mmc_card_set_ddr_mode(card);
else if ((card->ext_csd.card_type & EXT_CSD_CARD_TYPE_DDR_1_2V)
&& (host->caps & (MMC_CAP_1_2V_DDR)))
mmc_card_set_ddr_mode(card);
}

/*
* Activate wide bus (if supported).
*/
Expand All @@ -510,10 +537,16 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
unsigned ext_csd_bit, bus_width;

if (host->caps & MMC_CAP_8_BIT_DATA) {
ext_csd_bit = EXT_CSD_BUS_WIDTH_8;
if (mmc_card_ddr_mode(card))
ext_csd_bit = EXT_CSD_DDR_BUS_WIDTH_8;
else
ext_csd_bit = EXT_CSD_BUS_WIDTH_8;
bus_width = MMC_BUS_WIDTH_8;
} else {
ext_csd_bit = EXT_CSD_BUS_WIDTH_4;
if (mmc_card_ddr_mode(card))
ext_csd_bit = EXT_CSD_DDR_BUS_WIDTH_4;
else
ext_csd_bit = EXT_CSD_BUS_WIDTH_4;
bus_width = MMC_BUS_WIDTH_4;
}

Expand Down
4 changes: 4 additions & 0 deletions include/linux/mmc/card.h
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Original file line number Diff line number Diff line change
Expand Up @@ -48,6 +48,7 @@ struct mmc_ext_csd {
unsigned int sa_timeout; /* Units: 100ns */
unsigned int hs_max_dtr;
unsigned int sectors;
unsigned int card_type;
unsigned int hc_erase_size; /* In sectors */
unsigned int hc_erase_timeout; /* In milliseconds */
unsigned int sec_trim_mult; /* Secure trim multiplier */
Expand Down Expand Up @@ -113,6 +114,7 @@ struct mmc_card {
#define MMC_STATE_READONLY (1<<1) /* card is read-only */
#define MMC_STATE_HIGHSPEED (1<<2) /* card is in high speed mode */
#define MMC_STATE_BLOCKADDR (1<<3) /* card uses block-addressing */
#define MMC_STATE_HIGHSPEED_DDR (1<<4) /* card is in high speed mode */
unsigned int quirks; /* card quirks */
#define MMC_QUIRK_LENIENT_FN0 (1<<0) /* allow SDIO FN0 writes outside of the VS CCCR range */
#define MMC_QUIRK_BLKSZ_FOR_BYTE_MODE (1<<1) /* use func->cur_blksize */
Expand Down Expand Up @@ -154,11 +156,13 @@ struct mmc_card {
#define mmc_card_readonly(c) ((c)->state & MMC_STATE_READONLY)
#define mmc_card_highspeed(c) ((c)->state & MMC_STATE_HIGHSPEED)
#define mmc_card_blockaddr(c) ((c)->state & MMC_STATE_BLOCKADDR)
#define mmc_card_ddr_mode(c) ((c)->state & MMC_STATE_HIGHSPEED_DDR)

#define mmc_card_set_present(c) ((c)->state |= MMC_STATE_PRESENT)
#define mmc_card_set_readonly(c) ((c)->state |= MMC_STATE_READONLY)
#define mmc_card_set_highspeed(c) ((c)->state |= MMC_STATE_HIGHSPEED)
#define mmc_card_set_blockaddr(c) ((c)->state |= MMC_STATE_BLOCKADDR)
#define mmc_card_set_ddr_mode(c) ((c)->state |= MMC_STATE_HIGHSPEED_DDR)

static inline int mmc_card_lenient_fn0(const struct mmc_card *c)
{
Expand Down
1 change: 1 addition & 0 deletions include/linux/mmc/core.h
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Original file line number Diff line number Diff line change
Expand Up @@ -109,6 +109,7 @@ struct mmc_data {
#define MMC_DATA_WRITE (1 << 8)
#define MMC_DATA_READ (1 << 9)
#define MMC_DATA_STREAM (1 << 10)
#define MMC_DDR_MODE (1 << 11)

unsigned int bytes_xfered;

Expand Down
4 changes: 4 additions & 0 deletions include/linux/mmc/host.h
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Original file line number Diff line number Diff line change
Expand Up @@ -158,6 +158,10 @@ struct mmc_host {
#define MMC_CAP_NONREMOVABLE (1 << 8) /* Nonremovable e.g. eMMC */
#define MMC_CAP_WAIT_WHILE_BUSY (1 << 9) /* Waits while card is busy */
#define MMC_CAP_ERASE (1 << 10) /* Allow erase/trim commands */
#define MMC_CAP_1_8V_DDR (1 << 11) /* can support */
/* DDR mode at 1.8V */
#define MMC_CAP_1_2V_DDR (1 << 12) /* can support */
/* DDR mode at 1.2V */

mmc_pm_flag_t pm_caps; /* supported pm features */

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10 changes: 9 additions & 1 deletion include/linux/mmc/mmc.h
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Original file line number Diff line number Diff line change
Expand Up @@ -277,11 +277,19 @@ struct _mmc_csd {

#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_MASK 0x3 /* Mask out reserved and DDR bits */
#define EXT_CSD_CARD_TYPE_MASK 0xF /* Mask out reserved bits */
#define EXT_CSD_CARD_TYPE_DDR_1_8V (1<<2) /* Card can run at 52MHz */
/* DDR mode @1.8V or 3V I/O */
#define EXT_CSD_CARD_TYPE_DDR_1_2V (1<<3) /* Card can run at 52MHz */
/* DDR mode @1.2V I/O */
#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_SEC_ER_EN BIT(0)
#define EXT_CSD_SEC_BD_BLK_EN BIT(2)
Expand Down

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