The patch titled
mmc: MMC 4.4 DDR support
has been added to the -mm tree. Its filename is
mmc-mmc-44-ddr-support.patch
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*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find
out what to do about this
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: mmc: MMC 4.4 DDR support
From: Hanumath Prasad <hanumath.prasad@xxxxxxxxxxxxxx>
Add support for Dual Data Rate MMC cards as defined in the 4.4
specification.
Signed-off-by: Hanumath Prasad <hanumath.prasad@xxxxxxxxxxxxxx>
Acked-by: Linus Walleij <linus.walleij@xxxxxxxxxxxxxx>
Cc: <linux-mmc@xxxxxxxxxxxxxxx>
Cc: Chris Ball <cjb@xxxxxxxxxx>
Cc: Matt Fleming <matt@xxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/mmc/card/block.c | 10 +++++++---
drivers/mmc/core/mmc.c | 37 +++++++++++++++++++++++++++++++++++--
include/linux/mmc/card.h | 5 +++++
include/linux/mmc/core.h | 1 +
include/linux/mmc/host.h | 4 ++++
include/linux/mmc/mmc.h | 11 +++++++++--
6 files changed, 61 insertions(+), 7 deletions(-)
diff -puN drivers/mmc/card/block.c~mmc-mmc-44-ddr-support drivers/mmc/card/block.c
--- a/drivers/mmc/card/block.c~mmc-mmc-44-ddr-support
+++ a/drivers/mmc/card/block.c
@@ -388,7 +388,8 @@ static int mmc_blk_issue_rw_rq(struct mm
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;
@@ -669,8 +670,11 @@ mmc_blk_set_blksize(struct mmc_blk_data
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);
diff -puN drivers/mmc/core/mmc.c~mmc-mmc-44-ddr-support drivers/mmc/core/mmc.c
--- a/drivers/mmc/core/mmc.c~mmc-mmc-44-ddr-support
+++ a/drivers/mmc/core/mmc.c
@@ -258,6 +258,21 @@ static int mmc_read_ext_csd(struct mmc_c
}
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;
@@ -503,6 +518,18 @@ static int mmc_init_card(struct mmc_host
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).
*/
if ((card->csd.mmca_vsn >= CSD_SPEC_VER_4) &&
@@ -510,10 +537,16 @@ static int mmc_init_card(struct mmc_host
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;
}
diff -puN include/linux/mmc/card.h~mmc-mmc-44-ddr-support include/linux/mmc/card.h
--- a/include/linux/mmc/card.h~mmc-mmc-44-ddr-support
+++ a/include/linux/mmc/card.h
@@ -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 */
@@ -113,6 +114,8 @@ 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 */
+ /* dual data rate 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 */
@@ -153,11 +156,13 @@ struct mmc_card {
#define mmc_card_present(c) ((c)->state & MMC_STATE_PRESENT)
#define mmc_card_readonly(c) ((c)->state & MMC_STATE_READONLY)
#define mmc_card_highspeed(c) ((c)->state & MMC_STATE_HIGHSPEED)
+#define mmc_card_ddr_mode(c) ((c)->state & MMC_STATE_HIGHSPEED_DDR)
#define mmc_card_blockaddr(c) ((c)->state & MMC_STATE_BLOCKADDR)
#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_ddr_mode(c) ((c)->state |= MMC_STATE_HIGHSPEED_DDR)
#define mmc_card_set_blockaddr(c) ((c)->state |= MMC_STATE_BLOCKADDR)
static inline int mmc_card_lenient_fn0(const struct mmc_card *c)
diff -puN include/linux/mmc/core.h~mmc-mmc-44-ddr-support include/linux/mmc/core.h
--- a/include/linux/mmc/core.h~mmc-mmc-44-ddr-support
+++ a/include/linux/mmc/core.h
@@ -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;
diff -puN include/linux/mmc/host.h~mmc-mmc-44-ddr-support include/linux/mmc/host.h
--- a/include/linux/mmc/host.h~mmc-mmc-44-ddr-support
+++ a/include/linux/mmc/host.h
@@ -157,6 +157,10 @@ 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 << 10) /* can support */
+ /* DDR mode at 1.8V */
+#define MMC_CAP_1_2V_DDR (1 << 11) /* can support */
+ /* DDR mode at 1.2V */
mmc_pm_flag_t pm_caps; /* supported pm features */
diff -puN include/linux/mmc/mmc.h~mmc-mmc-44-ddr-support include/linux/mmc/mmc.h
--- a/include/linux/mmc/mmc.h~mmc-mmc-44-ddr-support
+++ a/include/linux/mmc/mmc.h
@@ -277,11 +277,18 @@ 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)
_
Patches currently in -mm which might be from hanumath.prasad@xxxxxxxxxxxxxx are
mmc-mmc-44-ddr-support.patch
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