[PATCH v2] mmc: core: Report firmware version for eMMC 5.0 devices.

[Gwendal Grignou]

For eMMC 5.0 compliant device, firmware version is stored in ext_csd.
Report firmware as a 64bit hexa decimal. Vendor can use hexa or ascii
string to report firmware version.
Also add FFU related EXT_CSD register and note if the device is FFU capable.

Signed-off-by: Gwendal Grignou <***@chromium.org>
---
drivers/mmc/core/mmc.c | 27 ++++++++++++++++++++++++++-
include/linux/mmc/card.h | 3 +++
include/linux/mmc/mmc.h | 3 +++
3 files changed, 32 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 1eda8dd..9a7663a 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -603,6 +603,14 @@ static int mmc_read_ext_csd(struct mmc_card *card, u8 *ext_csd)
card->ext_csd.data_sector_size = 512;
}

+ /* eMMC v5 or later */
+ if (card->ext_csd.rev >= 7) {
+ memcpy(card->ext_csd.fwrev, &ext_csd[EXT_CSD_FIRMWARE_VERSION],
+ MMC_FIRMWARE_LEN);
+ card->ext_csd.ffu_capable =
+ (ext_csd[EXT_CSD_SUPPORTED_MODE] & 1) &&
+ !(ext_csd[EXT_CSD_FW_CONFIG] & 1);
+ }
out:
return err;
}
@@ -697,7 +705,7 @@ MMC_DEV_ATTR(csd, "%08x%08x%08x%08x\n", card->raw_csd[0], card->raw_csd[1],
MMC_DEV_ATTR(date, "%02d/%04d\n", card->cid.month, card->cid.year);
MMC_DEV_ATTR(erase_size, "%u\n", card->erase_size << 9);
MMC_DEV_ATTR(preferred_erase_size, "%u\n", card->pref_erase << 9);
-MMC_DEV_ATTR(fwrev, "0x%x\n", card->cid.fwrev);
+MMC_DEV_ATTR(ffu_capable, "%d\n", card->ext_csd.ffu_capable);
MMC_DEV_ATTR(hwrev, "0x%x\n", card->cid.hwrev);
MMC_DEV_ATTR(manfid, "0x%06x\n", card->cid.manfid);
MMC_DEV_ATTR(name, "%s\n", card->cid.prod_name);
@@ -710,6 +718,22 @@ MMC_DEV_ATTR(enhanced_area_size, "%u\n", card->ext_csd.enhanced_area_size);
MMC_DEV_ATTR(raw_rpmb_size_mult, "%#x\n", card->ext_csd.raw_rpmb_size_mult);
MMC_DEV_ATTR(rel_sectors, "%#x\n", card->ext_csd.rel_sectors);

+static ssize_t mmc_fwrev_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct mmc_card *card = mmc_dev_to_card(dev);
+
+ if (card->ext_csd.rev < 7) {
+ return sprintf(buf, "0x%x\n", card->cid.fwrev);
+ } else {
+ return sprintf(buf, "0x%*phN\n", MMC_FIRMWARE_LEN,
+ card->ext_csd.fwrev);
+ }
+}
+
+static DEVICE_ATTR(fwrev, S_IRUGO, mmc_fwrev_show, NULL);
+
static struct attribute *mmc_std_attrs[] = {
&dev_attr_cid.attr,
&dev_attr_csd.attr,
@@ -717,6 +741,7 @@ static struct attribute *mmc_std_attrs[] = {
&dev_attr_erase_size.attr,
&dev_attr_preferred_erase_size.attr,
&dev_attr_fwrev.attr,
+ &dev_attr_ffu_capable.attr,
&dev_attr_hwrev.attr,
&dev_attr_manfid.attr,
&dev_attr_name.attr,
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index d424b9d..14b54ff 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -87,6 +87,9 @@ struct mmc_ext_csd {
unsigned int data_tag_unit_size; /* DATA TAG UNIT size */
unsigned int boot_ro_lock; /* ro lock support */
bool boot_ro_lockable;
+ bool ffu_capable; /* Firmware upgrade support */
+#define MMC_FIRMWARE_LEN 8
+ u8 fwrev[MMC_FIRMWARE_LEN]; /* FW version */
u8 raw_exception_status; /* 54 */
u8 raw_partition_support; /* 160 */
u8 raw_rpmb_size_mult; /* 168 */
diff --git a/include/linux/mmc/mmc.h b/include/linux/mmc/mmc.h
index 64ec963..1af1dff 100644
--- a/include/linux/mmc/mmc.h
+++ b/include/linux/mmc/mmc.h
@@ -290,6 +290,7 @@ struct _mmc_csd {
#define EXT_CSD_SANITIZE_START 165 /* W */
#define EXT_CSD_WR_REL_PARAM 166 /* RO */
#define EXT_CSD_RPMB_MULT 168 /* RO */
+#define EXT_CSD_FW_CONFIG 169 /* R/W */
#define EXT_CSD_BOOT_WP 173 /* R/W */
#define EXT_CSD_ERASE_GROUP_DEF 175 /* R/W */
#define EXT_CSD_PART_CONFIG 179 /* R/W */
@@ -326,6 +327,8 @@ struct _mmc_csd {
#define EXT_CSD_GENERIC_CMD6_TIME 248 /* RO */
#define EXT_CSD_CACHE_SIZE 249 /* RO, 4 bytes */
#define EXT_CSD_PWR_CL_DDR_200_360 253 /* RO */
+#define EXT_CSD_FIRMWARE_VERSION 254 /* RO, 8 bytes */
+#define EXT_CSD_SUPPORTED_MODE 493 /* RO */
#define EXT_CSD_TAG_UNIT_SIZE 498 /* RO */
#define EXT_CSD_DATA_TAG_SUPPORT 499 /* RO */
#define EXT_CSD_MAX_PACKED_WRITES 500 /* RO */