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authorChuanxiao Dong <chuanxiao.dong@intel.com>2011-01-21 15:09:41 -0500
committerChris Ball <cjb@laptop.org>2011-03-15 13:48:01 -0400
commit709de99df0ecf3102e7728fbd876a3591859f423 (patch)
treef1adaa026531d3dcc93cf33c2e8ede84455ca46a /include
parentcfd80652467717ca7346857d6d8c94503d74f3a3 (diff)
mmc: export eMMC4.4 enhanced area details to sysfs
Enhanced area feature is a new feature defined in eMMC4.4 standard. This user data area provides higher performance/reliability, at the expense of using twice the effective media space due to the area using SLC. The MMC driver now reads out the enhanced area offset and size and adds them to the device attributes in sysfs. Enabling the enhanced area can only be done once, and should be done in manufacturing. To use this feature, bit ERASE_GRP_DEF should also be set. Documentation/ABI/testing/sysfs-devices-mmc describes the two new attributes. Signed-off-by: Chuanxiao Dong <chuanxiao.dong@intel.com> Reviewed-by: Chris Ball <cjb@laptop.org> Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/mmc/card.h3
-rw-r--r--include/linux/mmc/mmc.h3
2 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index 8ce082781ccb..4652cf9c5442 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -54,6 +54,9 @@ struct mmc_ext_csd {
54 unsigned int sec_trim_mult; /* Secure trim multiplier */ 54 unsigned int sec_trim_mult; /* Secure trim multiplier */
55 unsigned int sec_erase_mult; /* Secure erase multiplier */ 55 unsigned int sec_erase_mult; /* Secure erase multiplier */
56 unsigned int trim_timeout; /* In milliseconds */ 56 unsigned int trim_timeout; /* In milliseconds */
57 bool enhanced_area_en; /* enable bit */
58 unsigned long long enhanced_area_offset; /* Units: Byte */
59 unsigned int enhanced_area_size; /* Units: KB */
57}; 60};
58 61
59struct sd_scr { 62struct sd_scr {
diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
index 612301f85d14..264ba5451e3b 100644
--- a/include/linux/mmc/mmc.h
+++ b/include/linux/mmc/mmc.h
@@ -253,6 +253,8 @@ struct _mmc_csd {
253 * EXT_CSD fields 253 * EXT_CSD fields
254 */ 254 */
255 255
256#define EXT_CSD_PARTITION_ATTRIBUTE 156 /* R/W */
257#define EXT_CSD_PARTITION_SUPPORT 160 /* RO */
256#define EXT_CSD_ERASE_GROUP_DEF 175 /* R/W */ 258#define EXT_CSD_ERASE_GROUP_DEF 175 /* R/W */
257#define EXT_CSD_ERASED_MEM_CONT 181 /* RO */ 259#define EXT_CSD_ERASED_MEM_CONT 181 /* RO */
258#define EXT_CSD_BUS_WIDTH 183 /* R/W */ 260#define EXT_CSD_BUS_WIDTH 183 /* R/W */
@@ -262,6 +264,7 @@ struct _mmc_csd {
262#define EXT_CSD_CARD_TYPE 196 /* RO */ 264#define EXT_CSD_CARD_TYPE 196 /* RO */
263#define EXT_CSD_SEC_CNT 212 /* RO, 4 bytes */ 265#define EXT_CSD_SEC_CNT 212 /* RO, 4 bytes */
264#define EXT_CSD_S_A_TIMEOUT 217 /* RO */ 266#define EXT_CSD_S_A_TIMEOUT 217 /* RO */
267#define EXT_CSD_HC_WP_GRP_SIZE 221 /* RO */
265#define EXT_CSD_ERASE_TIMEOUT_MULT 223 /* RO */ 268#define EXT_CSD_ERASE_TIMEOUT_MULT 223 /* RO */
266#define EXT_CSD_HC_ERASE_GRP_SIZE 224 /* RO */ 269#define EXT_CSD_HC_ERASE_GRP_SIZE 224 /* RO */
267#define EXT_CSD_SEC_TRIM_MULT 229 /* RO */ 270#define EXT_CSD_SEC_TRIM_MULT 229 /* RO */