mmc: MMC sector based cards

Support for MMC 4.2 sector based cards. This tweaks the init a
bit and reads a new field out of the EXT_CSD.

Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>

4 files changed, 38 insertions, 8 deletions

diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 2ba46273496b..f772df93a398 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -1106,11 +1106,29 @@ static void mmc_process_ext_csds(struct mmc_host *host)
                 mmc_wait_for_req(host, &mrq);
 
                 if (cmd.error != MMC_ERR_NONE || data.error != MMC_ERR_NONE) {
-                        printk("%s: unable to read EXT_CSD, performance "
-                                "might suffer.\n", mmc_hostname(card->host));
+                        if (card->csd.capacity == (4096 * 512)) {
+                                printk(KERN_ERR "%s: unable to read EXT_CSD "
+                                        "on a possible high capacity card. "
+                                        "Card will be ignored.\n",
+                                        mmc_hostname(card->host));
+                                mmc_card_set_dead(card);
+                        } else {
+                                printk(KERN_WARNING "%s: unable to read "
+                                        "EXT_CSD, performance might "
+                                        "suffer.\n",
+                                        mmc_hostname(card->host));
+                        }
                         continue;
                 }
 
+                card->ext_csd.sectors =
+                        ext_csd[EXT_CSD_SEC_CNT + 0] << 0 |
+                        ext_csd[EXT_CSD_SEC_CNT + 1] << 8 |
+                        ext_csd[EXT_CSD_SEC_CNT + 2] << 16 |
+                        ext_csd[EXT_CSD_SEC_CNT + 3] << 24;
+                if (card->ext_csd.sectors)
+                        mmc_card_set_blockaddr(card);
+
                 switch (ext_csd[EXT_CSD_CARD_TYPE]) {
                 case EXT_CSD_CARD_TYPE_52 | EXT_CSD_CARD_TYPE_26:
                         card->ext_csd.hs_max_dtr = 52000000;
@@ -1499,7 +1517,8 @@ static void mmc_setup(struct mmc_host *host)
                         mmc_send_app_op_cond(host, host->ocr | (sd2 << 30), NULL);
                 }
         } else {
-                mmc_send_op_cond(host, host->ocr, NULL);
+                /* The extra bit indicates that we support high capacity */
+                mmc_send_op_cond(host, host->ocr | (1 << 30), NULL);
         }
 
         mmc_discover_cards(host);
diff --git a/drivers/mmc/mmc_block.c b/drivers/mmc/mmc_block.c
index 95b0da6abe87..63fbde8756ac 100644
--- a/drivers/mmc/mmc_block.c
+++ b/drivers/mmc/mmc_block.c
@@ -491,11 +491,20 @@ static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
 
         blk_queue_hardsect_size(md->queue.queue, 1 << md->block_bits);
 
-        /*
-         * The CSD capacity field is in units of read_blkbits.
-         * set_capacity takes units of 512 bytes.
-         */
-        set_capacity(md->disk, card->csd.capacity << (card->csd.read_blkbits - 9));
+        if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
+                /*
+                 * The EXT_CSD sector count is in number or 512 byte
+                 * sectors.
+                 */
+                set_capacity(md->disk, card->ext_csd.sectors);
+        } else {
+                /*
+                 * The CSD capacity field is in units of read_blkbits.
+                 * set_capacity takes units of 512 bytes.
+                 */
+                set_capacity(md->disk,
+                        card->csd.capacity << (card->csd.read_blkbits - 9));
+        }
         return md;
 
  err_putdisk:
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index e45712acfac5..5d9896c260a2 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -41,6 +41,7 @@ struct mmc_csd {
 
 struct mmc_ext_csd {
         unsigned int            hs_max_dtr;
+        unsigned int            sectors;
 };
 
 struct sd_scr {
diff --git a/include/linux/mmc/protocol.h b/include/linux/mmc/protocol.h
index c90b6768329d..d740ab94fa25 100644
--- a/include/linux/mmc/protocol.h
+++ b/include/linux/mmc/protocol.h
@@ -284,6 +284,7 @@ struct _mmc_csd {
 #define EXT_CSD_BUS_WIDTH       183     /* R/W */
 #define EXT_CSD_HS_TIMING       185     /* R/W */
 #define EXT_CSD_CARD_TYPE       196     /* RO */
+#define EXT_CSD_SEC_CNT         212     /* RO, 4 bytes */
 
 /*
  * EXT_CSD field definitions