mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-11-01 17:08:10 +00:00
Code Issues Releases Wiki Activity

mmc: MMC 4.4 DDR support

Browse source 
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>
This commit is contained in:
Hanumath Prasad 2010-09-30 17:37:23 -04:00 committed by Chris Ball
parent 99fc513101
commit dfc13e8402
6 changed files with 60 additions and 6 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

10
drivers/mmc/card/block.c
View file

@ -373,7 +373,8 @@ static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *req)
readcmd = MMC_READ_SINGLE_BLOCK; readcmd = MMC_READ_SINGLE_BLOCK;
writecmd = MMC_WRITE_BLOCK; writecmd = MMC_WRITE_BLOCK;
} }
if (mmc_card_ddr_mode(card))
brq.data.flags |= MMC_DDR_MODE;
if (rq_data_dir(req) == READ) { if (rq_data_dir(req) == READ) {
brq.cmd.opcode = readcmd; brq.cmd.opcode = readcmd;
brq.data.flags |= MMC_DATA_READ; brq.data.flags |= MMC_DATA_READ;
@ -655,8 +656,11 @@ mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card)
struct mmc_command cmd; struct mmc_command cmd;
int err; 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; return 0;
mmc_claim_host(card->host); mmc_claim_host(card->host);

37
drivers/mmc/core/mmc.c
View file

@ -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) { 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: case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
card->ext_csd.hs_max_dtr = 52000000; card->ext_csd.hs_max_dtr = 52000000;
break; break;
@ -502,6 +517,18 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
mmc_set_clock(host, max_dtr); 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). * Activate wide bus (if supported).
*/ */
@ -510,10 +537,16 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
unsigned ext_csd_bit, bus_width; unsigned ext_csd_bit, bus_width;
if (host->caps & MMC_CAP_8_BIT_DATA) { 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; bus_width = MMC_BUS_WIDTH_8;
} else { } 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; bus_width = MMC_BUS_WIDTH_4;
} }

4
include/linux/mmc/card.h
View file

@ -48,6 +48,7 @@ struct mmc_ext_csd {
unsigned int sa_timeout; /* Units: 100ns */ unsigned int sa_timeout; /* Units: 100ns */
unsigned int hs_max_dtr; unsigned int hs_max_dtr;
unsigned int sectors; unsigned int sectors;
unsigned int card_type;
unsigned int hc_erase_size; /* In sectors */ unsigned int hc_erase_size; /* In sectors */
unsigned int hc_erase_timeout; /* In milliseconds */ unsigned int hc_erase_timeout; /* In milliseconds */
unsigned int sec_trim_mult; /* Secure trim multiplier */ unsigned int sec_trim_mult; /* Secure trim multiplier */
@ -113,6 +114,7 @@ struct mmc_card {
#define MMC_STATE_READONLY (1<<1) /* card is read-only */ #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_HIGHSPEED (1<<2) /* card is in high speed mode */
#define MMC_STATE_BLOCKADDR (1<<3) /* card uses block-addressing */ #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 */ 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_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 */ #define MMC_QUIRK_BLKSZ_FOR_BYTE_MODE (1<<1) /* use func->cur_blksize */
@ -154,11 +156,13 @@ struct mmc_card {
#define mmc_card_readonly(c) ((c)->state & MMC_STATE_READONLY) #define mmc_card_readonly(c) ((c)->state & MMC_STATE_READONLY)
#define mmc_card_highspeed(c) ((c)->state & MMC_STATE_HIGHSPEED) #define mmc_card_highspeed(c) ((c)->state & MMC_STATE_HIGHSPEED)
#define mmc_card_blockaddr(c) ((c)->state & MMC_STATE_BLOCKADDR) #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_present(c) ((c)->state |= MMC_STATE_PRESENT)
#define mmc_card_set_readonly(c) ((c)->state |= MMC_STATE_READONLY) #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_highspeed(c) ((c)->state |= MMC_STATE_HIGHSPEED)
#define mmc_card_set_blockaddr(c) ((c)->state |= MMC_STATE_BLOCKADDR) #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) static inline int mmc_card_lenient_fn0(const struct mmc_card *c)
{ {

1
include/linux/mmc/core.h
View file

@ -109,6 +109,7 @@ struct mmc_data {
#define MMC_DATA_WRITE (1 << 8) #define MMC_DATA_WRITE (1 << 8)
#define MMC_DATA_READ (1 << 9) #define MMC_DATA_READ (1 << 9)
#define MMC_DATA_STREAM (1 << 10) #define MMC_DATA_STREAM (1 << 10)
#define MMC_DDR_MODE (1 << 11)
unsigned int bytes_xfered; unsigned int bytes_xfered;

4
include/linux/mmc/host.h
View file

@ -158,6 +158,10 @@ struct mmc_host {
#define MMC_CAP_NONREMOVABLE (1 << 8) /* Nonremovable e.g. eMMC */ #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_WAIT_WHILE_BUSY (1 << 9) /* Waits while card is busy */
#define MMC_CAP_ERASE (1 << 10) /* Allow erase/trim commands */ #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 */ mmc_pm_flag_t pm_caps; /* supported pm features */

10
include/linux/mmc/mmc.h
View file

@ -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_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_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_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_4 1 /* Card is in 4 bit mode */
#define EXT_CSD_BUS_WIDTH_8 2 /* Card is in 8 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_ER_EN BIT(0)
#define EXT_CSD_SEC_BD_BLK_EN BIT(2) #define EXT_CSD_SEC_BD_BLK_EN BIT(2)