new file mode 100644
@@ -0,0 +1,19 @@
+What: /sys/devices/.../mmc_host/mmcX/mmcX:XXXX/enhanced_area_offset
+Date: January 2011
+Contact: Chuanxiao Dong <chuanxiao.dong@intel.com>
+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 0. Unit Byte.
+
+What: /sys/devices/.../mmc_host/mmcX/mmcX:XXXX/enhanced_area_size
+Date: January 2011
+Contact: Chuanxiao Dong <chuanxiao.dong@intel.com>
+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 0. Unit KBytes.
@@ -302,6 +302,41 @@ static int mmc_read_ext_csd(struct mmc_card *card)
}
if (card->ext_csd.rev >= 4) {
+ /*
+ * Enhanced area feature support
+ * check whether eMMC card is enabled enhanced area,
+ * if so, export enhanced area offset and size to
+ * user by adding sysfs interface
+ */
+ if ((ext_csd[EXT_CSD_PARTITION_SUPPORT] & 0x2) &&
+ (ext_csd[EXT_CSD_PARTITION_ATTRIBUTE] & 0x1)) {
+ u8 hc_erase_grp_sz =
+ ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];
+ u8 hc_wp_grp_sz =
+ ext_csd[EXT_CSD_HC_WP_GRP_SIZE];
+ /*
+ * set a flag to identify whether the enhanced
+ * user data are enabled
+ */
+ card->ext_csd.enhanced_area_en = 1;
+ /*
+ * caculate the enhanced data area offset, unit B
+ */
+ card->ext_csd.enhanced_area_offset =
+ (ext_csd[139] << 24) + (ext_csd[138] << 16) +
+ (ext_csd[137] << 8) + ext_csd[136];
+ if (mmc_card_blockaddr(card))
+ card->ext_csd.enhanced_area_offset <<= 9;
+ /*
+ * caculate the enhanced data area size, unit KB
+ */
+ card->ext_csd.enhanced_area_size =
+ (ext_csd[142] << 16) + (ext_csd[141] << 8) +
+ ext_csd[140];
+ card->ext_csd.enhanced_area_size *=
+ (size_t)(hc_erase_grp_sz * hc_wp_grp_sz);
+ card->ext_csd.enhanced_area_size <<= 9;
+ }
card->ext_csd.sec_trim_mult =
ext_csd[EXT_CSD_SEC_TRIM_MULT];
card->ext_csd.sec_erase_mult =
@@ -336,6 +371,9 @@ MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
MMC_DEV_ATTR(oemid, "0x%04x\n", card->cid.oemid);
MMC_DEV_ATTR(serial, "0x%08x\n", card->cid.serial);
+MMC_DEV_ATTR(enhanced_area_offset, "0x%llxB\n",
+ card->ext_csd.enhanced_area_offset);
+MMC_DEV_ATTR(enhanced_area_size, "0x%xKB\n", card->ext_csd.enhanced_area_size);
static struct attribute *mmc_std_attrs[] = {
&dev_attr_cid.attr,
@@ -349,6 +387,8 @@ static struct attribute *mmc_std_attrs[] = {
&dev_attr_name.attr,
&dev_attr_oemid.attr,
&dev_attr_serial.attr,
+ &dev_attr_enhanced_area_offset.attr,
+ &dev_attr_enhanced_area_size.attr,
NULL,
};
@@ -484,6 +524,39 @@ static int mmc_init_card(struct mmc_host *host, u32 ocr,
}
/*
+ * If enhanced_area_en is TRUE, host need to enable
+ * ERASE_GRP_DEF bit.
+ * ERASE_GRP_DEF bit will be lost everytime
+ * after a reset or power off.
+ */
+ if (card->ext_csd.enhanced_area_en) {
+ err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
+ EXT_CSD_ERASE_GROUP_DEF, 1);
+
+ if (err && err != -EBADMSG)
+ goto free_card;
+
+ if (err) {
+ err = 0;
+ /*
+ * Just disable enhanced area off & sz
+ * will try to enable ERASE_GROUP_DEF
+ * during next time reinit
+ */
+ card->ext_csd.enhanced_area_offset = 0;
+ card->ext_csd.enhanced_area_size = 0;
+ } else {
+ card->ext_csd.erase_group_def = 1;
+ /*
+ * enable ERASE_GRP_DEF successfully.
+ * This will affect the erase size, so
+ * here need to reset erase size
+ */
+ mmc_set_erase_size(card);
+ }
+ }
+
+ /*
* Activate high speed (if supported)
*/
if ((card->ext_csd.hs_max_dtr != 0) &&
@@ -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; /* enhanced area enable bit */
+ loff_t enhanced_area_offset; /* enhanced area addr */
+ size_t enhanced_area_size; /* enhanced area size */
};
struct sd_scr {
@@ -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 */