mmc: implemented eMMC4.4 enhanced area feature

PATCH In review Chuanxiao Dong 2 participants 3 messages Jan 21, 2011 – Jan 22, 2011 MMC, SD and SDIO

Share & tools

Chuanxiao Dong

author

2011-01-21 20:15 UTC #0 lore raw

PATCH v4 1/1 mmc: implemented eMMC4.4 enhanced area feature

Enhanced area feature is a new feature defined in eMMC4.4 standard. This kind of area can help to improve the performance.

MMC driver will read out the enhanced area offset and size and add them to be device attributes. The feature enabling should be done in manufactory. To use this feature, bit ERASE_GRP_DEF should also be set.

Documentation/ABI/testing/sysfs-devices-mmc described the two new attributes

Signed-off-by Chuanxiao Dong <[email protected]>

---
 Documentation/ABI/testing/sysfs-devices-mmc |   21 +++++++
 drivers/mmc/core/mmc.c                      |   80 +++++++++++++++++++++++++++
 include/linux/mmc/card.h                    |    3 +
 include/linux/mmc/mmc.h                     |    3 +
 4 files changed, 107 insertions(+), 0 deletions(-)
 create mode 100644 Documentation/ABI/testing/sysfs-devices-mmc

Documentation/ABI/testing/sysfs-devices-mmc new file +21 -0

new file mode 100644
index 0000000..8b18326
@@ -0,0 +1,21 @@
+What:		/sys/devices/.../mmc_host/mmcX/mmcX:XXXX/enhanced_area_offset
+Date:		January 2011
+Contact:	Chuanxiao Dong <[email protected]>
+Description:
+		Enhanced area is a new feature defined in eMMC4.4 standard.
+		eMMC4.4 or later card can support such feature. This kind of
+		area can help to improve the card performance. If the feature is
+		enabled, this attribute will indicate the start address of
+		enhanced data area. If not, this attribute will be -EINVAL. Unit
+		Byte. Format decimal.
+
+What:		/sys/devices/.../mmc_host/mmcX/mmcX:XXXX/enhanced_area_size
+Date:		January 2011
+Contact:	Chuanxiao Dong <[email protected]>
+Description:
+		Enhanced area is a new feature defined in eMMC4.4 standard.
+		eMMC4.4 or later card can support such feature. This kind of
+		area can help to improve the card performance. If the feature is
+		enabled, this attribute will indicate the size of enhanced data
+		area. If not, this attribute will be -EINVAL. Unit KByte. Format
+		decimal.

drivers/mmc/core/mmc.c +80 -0

104 lines not on this page · raw message

include/linux/mmc/card.h +3 -0

index 8ce0827..4652cf9 100644
@@ -54,6 +54,9 @@ struct mmc_ext_csd {
 	unsigned int		sec_trim_mult;	/* Secure trim multiplier  */
 	unsigned int		sec_erase_mult;	/* Secure erase multiplier */
 	unsigned int		trim_timeout;		/* In milliseconds */
+	bool			enhanced_area_en;	/* enable bit */
+	unsigned long long	enhanced_area_offset;	/* Units: Byte */
+	unsigned int		enhanced_area_size;	/* Units: KB */
 };
 
 struct sd_scr {

include/linux/mmc/mmc.h +3 -0

index 612301f..264ba54 100644
@@ -253,6 +253,8 @@ struct _mmc_csd {
  * EXT_CSD fields
  */
 
+#define EXT_CSD_PARTITION_ATTRIBUTE	156	/* R/W */
+#define EXT_CSD_PARTITION_SUPPORT	160	/* RO */
 #define EXT_CSD_ERASE_GROUP_DEF		175	/* R/W */
 #define EXT_CSD_ERASED_MEM_CONT		181	/* RO */
 #define EXT_CSD_BUS_WIDTH		183	/* R/W */

@@ -262,6 +264,7 @@ struct _mmc_csd {
 #define EXT_CSD_CARD_TYPE		196	/* RO */
 #define EXT_CSD_SEC_CNT			212	/* RO, 4 bytes */
 #define EXT_CSD_S_A_TIMEOUT		217	/* RO */
+#define EXT_CSD_HC_WP_GRP_SIZE		221	/* RO */
 #define EXT_CSD_ERASE_TIMEOUT_MULT	223	/* RO */
 #define EXT_CSD_HC_ERASE_GRP_SIZE	224	/* RO */
 #define EXT_CSD_SEC_TRIM_MULT		229	/* RO */

Signature · 1 line

1.6.6.1

Chris Ball

2011-01-22 01:51 UTC #1 lore raw

Hi Chuanxiao,

Quoted 10 lines · Chuanxiao Dong

Enhanced area feature is a new feature defined in eMMC4.4 standard. This kind of area can help to improve the performance.
MMC driver will read out the enhanced area offset and size and add them to be device attributes. The feature enabling should be done in manufactory. To use this feature, bit ERASE_GRP_DEF should also be set.
Documentation/ABI/testing/sysfs-devices-mmc described the two new attributes
Signed-off-by Chuanxiao Dong <[email protected]>

Looks good, pushed to mmc-next. Thanks for all the edits to this!

Signature · 2 lines

Chris Ball   <[email protected]>   <http://printf.net/>
One Laptop Per Child

Dong, Chuanxiao

author

2011-01-22 03:00 UTC #2 lore raw

Hi Chris,
Thanks for letting me know this. :)

-Chuanxiao

Quoted 27 lines

-----Original Message-----
From: Chris Ball [mailto:[email protected]]
Sent: Saturday, January 22, 2011 9:52 AM
To: Dong, Chuanxiao
Cc: [email protected]; [email protected]; [email protected]
Subject: Re: [PATCH v4 1/1]mmc: implemented eMMC4.4 enhanced area feature
Hi Chuanxiao,
Quoted 10 lines · Chuanxiao Dong
Enhanced area feature is a new feature defined in eMMC4.4 standard. This kind of area can help to improve the performance.
MMC driver will read out the enhanced area offset and size and add them to be device attributes. The feature enabling should be done in manufactory. To use this feature, bit ERASE_GRP_DEF should also be set.
Documentation/ABI/testing/sysfs-devices-mmc described the two new attributes
Signed-off-by Chuanxiao Dong <[email protected]>
Looks good, pushed to mmc-next. Thanks for all the edits to this!
--
Chris Ball <[email protected]> <http://printf.net/>
One Laptop Per Child