mmc: core: Report firmware version for eMMC 5.0 devices.

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 <gwendal@chromium.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

3 files changed, 32 insertions, 1 deletions

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index bcde451f6d91..a5e05ceb554c 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -628,6 +628,14 @@ 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] & 0x1) &&
+                        !(ext_csd[EXT_CSD_FW_CONFIG] & 0x1);
+        }
 out:
         return err;
 }
@@ -722,7 +730,7 @@ 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);
@@ -735,6 +743,22 @@ 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,
@@ -742,6 +766,7 @@ 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 0ba8f251f8ef..4d69c00497bd 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -88,6 +88,9 @@ 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 1cd00b3a75b9..49ad7a943638 100644
--- a/include/linux/mmc/mmc.h
+++ b/include/linux/mmc/mmc.h
@@ -296,6 +296,7 @@ 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 */
@@ -332,6 +333,8 @@ 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 */